Support for NSS as a libpq TLS backend

From 3642ad3ebcd959f6a1560516369b5a87ebcd214f Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Thu, 25 Jun 2020 17:31:35 +0200
Subject: [PATCH 2/2] Make pg_stat_ssl reporting backend agnostic v2

Inspecting Port->ssl for an indication on whether the connection is
using TLS or not is tied to the fact that the current implementation
is using a variable named ssl. Making this a requirement for all TLS
backend implementations seems restricting since there in actual var
tracking the status, ssl_in_use. Switch to inspecting this variable
instead.
---
 src/backend/postmaster/pgstat.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/backend/postmaster/pgstat.c b/src/backend/postmaster/pgstat.c
index c022597bc0..edfa774ee4 100644
--- a/src/backend/postmaster/pgstat.c
+++ b/src/backend/postmaster/pgstat.c
@@ -2989,7 +2989,7 @@ pgstat_bestart(void)
 		MemSet(&lbeentry.st_clientaddr, 0, sizeof(lbeentry.st_clientaddr));
 
 #ifdef USE_SSL
-	if (MyProcPort && MyProcPort->ssl != NULL)
+	if (MyProcPort && MyProcPort->ssl_in_use)
 	{
 		lbeentry.st_ssl = true;
 		lsslstatus.ssl_bits = be_tls_get_cipher_bits(MyProcPort);
-- 
2.21.1 (Apple Git-122.3)

From ceec1b744171d4760de7cb0336a7d78a13dbbf6b Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Thu, 25 Jun 2020 17:31:28 +0200
Subject: [PATCH 1/2] WIP: Support libnss for as TLS backend v2

---
 configure                                     |  235 +++-
 configure.in                                  |   30 +
 src/Makefile.global.in                        |    1 +
 src/backend/libpq/Makefile                    |    4 +
 src/backend/libpq/auth.c                      |    7 +
 src/backend/libpq/be-secure-nss.c             | 1026 +++++++++++++++++
 src/backend/libpq/be-secure.c                 |    3 +
 src/backend/utils/misc/guc.c                  |   20 +-
 src/include/common/pg_nss.h                   |  141 +++
 src/include/libpq/libpq-be.h                  |    9 +-
 src/include/libpq/libpq.h                     |    3 +
 src/include/pg_config.h.in                    |    3 +
 src/include/pg_config_manual.h                |    5 +-
 src/interfaces/libpq/Makefile                 |    4 +
 src/interfaces/libpq/fe-connect.c             |    6 +
 src/interfaces/libpq/fe-secure-nss.c          |  960 +++++++++++++++
 src/interfaces/libpq/libpq-fe.h               |   11 +
 src/interfaces/libpq/libpq-int.h              |    5 +
 src/test/ssl/Makefile                         |  157 +++
 src/test/ssl/t/001_ssltests.pl                |  201 ++--
 src/test/ssl/t/002_scram.pl                   |    4 +-
 src/test/ssl/t/SSL/Backend/NSS.pm             |   65 ++
 src/test/ssl/t/SSL/Backend/OpenSSL.pm         |   97 ++
 .../ssl/t/{SSLServer.pm => SSL/Server.pm}     |   60 +-
 24 files changed, 2930 insertions(+), 127 deletions(-)
 create mode 100644 src/backend/libpq/be-secure-nss.c
 create mode 100644 src/include/common/pg_nss.h
 create mode 100644 src/interfaces/libpq/fe-secure-nss.c
 create mode 100644 src/test/ssl/t/SSL/Backend/NSS.pm
 create mode 100644 src/test/ssl/t/SSL/Backend/OpenSSL.pm
 rename src/test/ssl/t/{SSLServer.pm => SSL/Server.pm} (82%)

diff --git a/configure b/configure
index 2feff37fe3..3f6520ae34 100755
--- a/configure
+++ b/configure
@@ -711,6 +711,7 @@ with_uuid
 with_readline
 with_systemd
 with_selinux
+with_nss
 with_openssl
 with_ldap
 with_krb_srvnam
@@ -798,6 +799,7 @@ infodir
 docdir
 oldincludedir
 includedir
+runstatedir
 localstatedir
 sharedstatedir
 sysconfdir
@@ -856,6 +858,7 @@ with_bsd_auth
 with_ldap
 with_bonjour
 with_openssl
+with_nss
 with_selinux
 with_systemd
 with_readline
@@ -935,6 +938,7 @@ datadir='${datarootdir}'
 sysconfdir='${prefix}/etc'
 sharedstatedir='${prefix}/com'
 localstatedir='${prefix}/var'
+runstatedir='${localstatedir}/run'
 includedir='${prefix}/include'
 oldincludedir='/usr/include'
 docdir='${datarootdir}/doc/${PACKAGE_TARNAME}'
@@ -1187,6 +1191,15 @@ do
   | -silent | --silent | --silen | --sile | --sil)
     silent=yes ;;
 
+  -runstatedir | --runstatedir | --runstatedi | --runstated \
+  | --runstate | --runstat | --runsta | --runst | --runs \
+  | --run | --ru | --r)
+    ac_prev=runstatedir ;;
+  -runstatedir=* | --runstatedir=* | --runstatedi=* | --runstated=* \
+  | --runstate=* | --runstat=* | --runsta=* | --runst=* | --runs=* \
+  | --run=* | --ru=* | --r=*)
+    runstatedir=$ac_optarg ;;
+
   -sbindir | --sbindir | --sbindi | --sbind | --sbin | --sbi | --sb)
     ac_prev=sbindir ;;
   -sbindir=* | --sbindir=* | --sbindi=* | --sbind=* | --sbin=* \
@@ -1324,7 +1337,7 @@ fi
 for ac_var in	exec_prefix prefix bindir sbindir libexecdir datarootdir \
 		datadir sysconfdir sharedstatedir localstatedir includedir \
 		oldincludedir docdir infodir htmldir dvidir pdfdir psdir \
-		libdir localedir mandir
+		libdir localedir mandir runstatedir
 do
   eval ac_val=\$$ac_var
   # Remove trailing slashes.
@@ -1477,6 +1490,7 @@ Fine tuning of the installation directories:
   --sysconfdir=DIR        read-only single-machine data [PREFIX/etc]
   --sharedstatedir=DIR    modifiable architecture-independent data [PREFIX/com]
   --localstatedir=DIR     modifiable single-machine data [PREFIX/var]
+  --runstatedir=DIR       modifiable per-process data [LOCALSTATEDIR/run]
   --libdir=DIR            object code libraries [EPREFIX/lib]
   --includedir=DIR        C header files [PREFIX/include]
   --oldincludedir=DIR     C header files for non-gcc [/usr/include]
@@ -1558,6 +1572,7 @@ Optional Packages:
   --with-ldap             build with LDAP support
   --with-bonjour          build with Bonjour support
   --with-openssl          build with OpenSSL support
+  --with-nss              build with NSS support
   --with-selinux          build with SELinux support
   --with-systemd          build with systemd support
   --without-readline      do not use GNU Readline nor BSD Libedit for editing
@@ -8009,6 +8024,41 @@ fi
 $as_echo "$with_openssl" >&6; }
 
 
+#
+# LibNSS
+#
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether to build with NSS support" >&5
+$as_echo_n "checking whether to build with NSS support... " >&6; }
+
+
+
+# Check whether --with-nss was given.
+if test "${with_nss+set}" = set; then :
+  withval=$with_nss;
+  case $withval in
+    yes)
+
+$as_echo "#define USE_NSS 1" >>confdefs.h
+
+      ;;
+    no)
+      :
+      ;;
+    *)
+      as_fn_error $? "no argument expected for --with-nss option" "$LINENO" 5
+      ;;
+  esac
+
+else
+  with_nss=no
+
+fi
+
+
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $with_nss" >&5
+$as_echo "$with_nss" >&6; }
+
+
 #
 # SELinux
 #
@@ -12083,6 +12133,9 @@ fi
 fi
 
 if test "$with_openssl" = yes ; then
+  if test x"$with_nss" = x"yes" ; then
+    as_fn_error $? "multiple SSL backends cannot be enabled simultaneously\"" "$LINENO" 5
+  fi
     if test "$PORTNAME" != "win32"; then
      { $as_echo "$as_me:${as_lineno-$LINENO}: checking for CRYPTO_new_ex_data in -lcrypto" >&5
 $as_echo_n "checking for CRYPTO_new_ex_data in -lcrypto... " >&6; }
@@ -12341,6 +12394,157 @@ done
 
 fi
 
+if test "$with_nss" = yes ; then
+  if test x"$with_openssl" = x"yes" ; then
+    as_fn_error $? "multiple SSL backends cannot be enabled simultaneously\"" "$LINENO" 5
+  fi
+  CLEANLDFLAGS="$LDFLAGS"
+  # TODO: document this set of LDFLAGS
+  LDFLAGS="-lssl3 -lsmime3 -lnss3 -lplds4 -lplc4 -lnspr4 $LDFLAGS"
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for SSL_VersionRangeSet in -lnss3" >&5
+$as_echo_n "checking for SSL_VersionRangeSet in -lnss3... " >&6; }
+if ${ac_cv_lib_nss3_SSL_VersionRangeSet+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lnss3  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char SSL_VersionRangeSet ();
+int
+main ()
+{
+return SSL_VersionRangeSet ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_lib_nss3_SSL_VersionRangeSet=yes
+else
+  ac_cv_lib_nss3_SSL_VersionRangeSet=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_nss3_SSL_VersionRangeSet" >&5
+$as_echo "$ac_cv_lib_nss3_SSL_VersionRangeSet" >&6; }
+if test "x$ac_cv_lib_nss3_SSL_VersionRangeSet" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_LIBNSS3 1
+_ACEOF
+
+  LIBS="-lnss3 $LIBS"
+
+else
+  as_fn_error $? "library 'nss3' is required for NSS" "$LINENO" 5
+fi
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for PR_GetDefaultIOMethods in -lnspr4" >&5
+$as_echo_n "checking for PR_GetDefaultIOMethods in -lnspr4... " >&6; }
+if ${ac_cv_lib_nspr4_PR_GetDefaultIOMethods+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lnspr4  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char PR_GetDefaultIOMethods ();
+int
+main ()
+{
+return PR_GetDefaultIOMethods ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_lib_nspr4_PR_GetDefaultIOMethods=yes
+else
+  ac_cv_lib_nspr4_PR_GetDefaultIOMethods=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_nspr4_PR_GetDefaultIOMethods" >&5
+$as_echo "$ac_cv_lib_nspr4_PR_GetDefaultIOMethods" >&6; }
+if test "x$ac_cv_lib_nspr4_PR_GetDefaultIOMethods" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_LIBNSPR4 1
+_ACEOF
+
+  LIBS="-lnspr4 $LIBS"
+
+else
+  as_fn_error $? "library 'nspr4' is required for NSS" "$LINENO" 5
+fi
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for SSL_GetImplementedCiphers in -lssl3" >&5
+$as_echo_n "checking for SSL_GetImplementedCiphers in -lssl3... " >&6; }
+if ${ac_cv_lib_ssl3_SSL_GetImplementedCiphers+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lssl3  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char SSL_GetImplementedCiphers ();
+int
+main ()
+{
+return SSL_GetImplementedCiphers ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_lib_ssl3_SSL_GetImplementedCiphers=yes
+else
+  ac_cv_lib_ssl3_SSL_GetImplementedCiphers=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_ssl3_SSL_GetImplementedCiphers" >&5
+$as_echo "$ac_cv_lib_ssl3_SSL_GetImplementedCiphers" >&6; }
+if test "x$ac_cv_lib_ssl3_SSL_GetImplementedCiphers" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_LIBSSL3 1
+_ACEOF
+
+  LIBS="-lssl3 $LIBS"
+
+else
+  as_fn_error $? "library 'ssl3' is required for NSS" "$LINENO" 5
+fi
+
+  LDFLAGS="$CLEANLDFLAGS"
+fi
+
 if test "$with_pam" = yes ; then
   { $as_echo "$as_me:${as_lineno-$LINENO}: checking for pam_start in -lpam" >&5
 $as_echo_n "checking for pam_start in -lpam... " >&6; }
@@ -13243,6 +13447,25 @@ else
 fi
 
 
+fi
+
+if test "$with_nss" = yes ; then
+  ac_fn_c_check_header_mongrel "$LINENO" "ssl.h" "ac_cv_header_ssl_h" "$ac_includes_default"
+if test "x$ac_cv_header_ssl_h" = xyes; then :
+
+else
+  as_fn_error $? "header file <ssl.h> is required for NSS" "$LINENO" 5
+fi
+
+
+  ac_fn_c_check_header_mongrel "$LINENO" "nss.h" "ac_cv_header_nss_h" "$ac_includes_default"
+if test "x$ac_cv_header_nss_h" = xyes; then :
+
+else
+  as_fn_error $? "header file <nss.h> is required for NSS" "$LINENO" 5
+fi
+
+
 fi
 
 if test "$with_pam" = yes ; then
@@ -14588,7 +14811,7 @@ else
     We can't simply define LARGE_OFF_T to be 9223372036854775807,
     since some C++ compilers masquerading as C compilers
     incorrectly reject 9223372036854775807.  */
-#define LARGE_OFF_T (((off_t) 1 << 62) - 1 + ((off_t) 1 << 62))
+#define LARGE_OFF_T ((((off_t) 1 << 31) << 31) - 1 + (((off_t) 1 << 31) << 31))
   int off_t_is_large[(LARGE_OFF_T % 2147483629 == 721
 		       && LARGE_OFF_T % 2147483647 == 1)
 		      ? 1 : -1];
@@ -14634,7 +14857,7 @@ else
     We can't simply define LARGE_OFF_T to be 9223372036854775807,
     since some C++ compilers masquerading as C compilers
     incorrectly reject 9223372036854775807.  */
-#define LARGE_OFF_T (((off_t) 1 << 62) - 1 + ((off_t) 1 << 62))
+#define LARGE_OFF_T ((((off_t) 1 << 31) << 31) - 1 + (((off_t) 1 << 31) << 31))
   int off_t_is_large[(LARGE_OFF_T % 2147483629 == 721
 		       && LARGE_OFF_T % 2147483647 == 1)
 		      ? 1 : -1];
@@ -14658,7 +14881,7 @@ rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
     We can't simply define LARGE_OFF_T to be 9223372036854775807,
     since some C++ compilers masquerading as C compilers
     incorrectly reject 9223372036854775807.  */
-#define LARGE_OFF_T (((off_t) 1 << 62) - 1 + ((off_t) 1 << 62))
+#define LARGE_OFF_T ((((off_t) 1 << 31) << 31) - 1 + (((off_t) 1 << 31) << 31))
   int off_t_is_large[(LARGE_OFF_T % 2147483629 == 721
 		       && LARGE_OFF_T % 2147483647 == 1)
 		      ? 1 : -1];
@@ -14703,7 +14926,7 @@ else
     We can't simply define LARGE_OFF_T to be 9223372036854775807,
     since some C++ compilers masquerading as C compilers
     incorrectly reject 9223372036854775807.  */
-#define LARGE_OFF_T (((off_t) 1 << 62) - 1 + ((off_t) 1 << 62))
+#define LARGE_OFF_T ((((off_t) 1 << 31) << 31) - 1 + (((off_t) 1 << 31) << 31))
   int off_t_is_large[(LARGE_OFF_T % 2147483629 == 721
 		       && LARGE_OFF_T % 2147483647 == 1)
 		      ? 1 : -1];
@@ -14727,7 +14950,7 @@ rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
     We can't simply define LARGE_OFF_T to be 9223372036854775807,
     since some C++ compilers masquerading as C compilers
     incorrectly reject 9223372036854775807.  */
-#define LARGE_OFF_T (((off_t) 1 << 62) - 1 + ((off_t) 1 << 62))
+#define LARGE_OFF_T ((((off_t) 1 << 31) << 31) - 1 + (((off_t) 1 << 31) << 31))
   int off_t_is_large[(LARGE_OFF_T % 2147483629 == 721
 		       && LARGE_OFF_T % 2147483647 == 1)
 		      ? 1 : -1];
diff --git a/configure.in b/configure.in
index 0188c6ff07..afa90f7fbc 100644
--- a/configure.in
+++ b/configure.in
@@ -854,6 +854,15 @@ PGAC_ARG_BOOL(with, openssl, no, [build with OpenSSL support],
 AC_MSG_RESULT([$with_openssl])
 AC_SUBST(with_openssl)
 
+#
+# LibNSS
+#
+AC_MSG_CHECKING([whether to build with NSS support])
+PGAC_ARG_BOOL(with, nss, no, [build with NSS support],
+              [AC_DEFINE([USE_NSS], 1, [Define to build with NSS support. (--with-nss)])])
+AC_MSG_RESULT([$with_nss])
+AC_SUBST(with_nss)
+
 #
 # SELinux
 #
@@ -1203,6 +1212,9 @@ if test "$with_gssapi" = yes ; then
 fi
 
 if test "$with_openssl" = yes ; then
+  if test x"$with_nss" = x"yes" ; then
+    AC_MSG_ERROR([multiple SSL backends cannot be enabled simultaneously"])
+  fi
   dnl Order matters!
   if test "$PORTNAME" != "win32"; then
      AC_CHECK_LIB(crypto, CRYPTO_new_ex_data, [], [AC_MSG_ERROR([library 'crypto' is required for OpenSSL])])
@@ -1225,6 +1237,19 @@ if test "$with_openssl" = yes ; then
   AC_CHECK_FUNCS([CRYPTO_lock])
 fi
 
+if test "$with_nss" = yes ; then
+  if test x"$with_openssl" = x"yes" ; then
+    AC_MSG_ERROR([multiple SSL backends cannot be enabled simultaneously"])
+  fi
+  CLEANLDFLAGS="$LDFLAGS"
+  # TODO: document this set of LDFLAGS
+  LDFLAGS="-lssl3 -lsmime3 -lnss3 -lplds4 -lplc4 -lnspr4 $LDFLAGS"
+  AC_CHECK_LIB(nss3, SSL_VersionRangeSet, [], [AC_MSG_ERROR([library 'nss3' is required for NSS])])
+  AC_CHECK_LIB(nspr4, PR_GetDefaultIOMethods, [], [AC_MSG_ERROR([library 'nspr4' is required for NSS])])
+  AC_CHECK_LIB(ssl3, SSL_GetImplementedCiphers, [], [AC_MSG_ERROR([library 'ssl3' is required for NSS])])
+  LDFLAGS="$CLEANLDFLAGS"
+fi
+
 if test "$with_pam" = yes ; then
   AC_CHECK_LIB(pam,    pam_start, [], [AC_MSG_ERROR([library 'pam' is required for PAM])])
 fi
@@ -1400,6 +1425,11 @@ if test "$with_openssl" = yes ; then
   AC_CHECK_HEADER(openssl/err.h, [], [AC_MSG_ERROR([header file <openssl/err.h> is required for OpenSSL])])
 fi
 
+if test "$with_nss" = yes ; then
+  AC_CHECK_HEADER(ssl.h, [], [AC_MSG_ERROR([header file <ssl.h> is required for NSS])])
+  AC_CHECK_HEADER(nss.h, [], [AC_MSG_ERROR([header file <nss.h> is required for NSS])])
+fi
+
 if test "$with_pam" = yes ; then
   AC_CHECK_HEADERS(security/pam_appl.h, [],
                    [AC_CHECK_HEADERS(pam/pam_appl.h, [],
diff --git a/src/Makefile.global.in b/src/Makefile.global.in
index 9a6265b3a0..1f1706c4d0 100644
--- a/src/Makefile.global.in
+++ b/src/Makefile.global.in
@@ -184,6 +184,7 @@ with_perl	= @with_perl@
 with_python	= @with_python@
 with_tcl	= @with_tcl@
 with_openssl	= @with_openssl@
+with_nss        = @with_nss@
 with_readline	= @with_readline@
 with_selinux	= @with_selinux@
 with_systemd	= @with_systemd@
diff --git a/src/backend/libpq/Makefile b/src/backend/libpq/Makefile
index efc5ef760a..191266a426 100644
--- a/src/backend/libpq/Makefile
+++ b/src/backend/libpq/Makefile
@@ -30,6 +30,10 @@ OBJS = \
 
 ifeq ($(with_openssl),yes)
 OBJS += be-secure-openssl.o
+else
+ifeq ($(with_nss),yes)
+OBJS += be-secure-nss.o
+endif
 endif
 
 ifeq ($(with_gssapi),yes)
diff --git a/src/backend/libpq/auth.c b/src/backend/libpq/auth.c
index 02b6c3f127..8f4197d002 100644
--- a/src/backend/libpq/auth.c
+++ b/src/backend/libpq/auth.c
@@ -2870,7 +2870,14 @@ CheckCertAuth(Port *port)
 {
 	int			status_check_usermap = STATUS_ERROR;
 
+#if defined(USE_OPENSSL)
 	Assert(port->ssl);
+#elif defined(USE_NSS)
+	/* TODO: should we rename pr_fd to ssl, to keep consistency? */
+	Assert(port->pr_fd);
+#else
+	Assert(false);
+#endif
 
 	/* Make sure we have received a username in the certificate */
 	if (port->peer_cn == NULL ||
diff --git a/src/backend/libpq/be-secure-nss.c b/src/backend/libpq/be-secure-nss.c
new file mode 100644
index 0000000000..abb0b27d18
--- /dev/null
+++ b/src/backend/libpq/be-secure-nss.c
@@ -0,0 +1,1026 @@
+/*-------------------------------------------------------------------------
+ *
+ * be-secure-nss.c
+ *	  functions for supporting NSS as a TLS backend
+ *
+ *
+ * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ *	  src/backend/libpq/be-secure-nss.c
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#include "postgres.h"
+
+#include <sys/stat.h>
+
+/*
+ * BITS_PER_BYTE is also defined in the NSPR header fils, so we need to undef
+ * our version to avoid compiler warnings on redefinition.
+ */
+#define pg_BITS_PER_BYTE BITS_PER_BYTE
+#undef BITS_PER_BYTE
+
+/*
+ * The nspr/obsolete/protypes.h NSPR header typedefs uint64 and int64 with
+ * colliding definitions from ours, causing a much expected compiler error.
+ * The definitions are however not actually used in NSPR at all, and are only
+ * intended for what seems to be backwards compatibility for apps written
+ * against old versions of NSPR.  The following comment is in the referenced
+ * file, and was added in 1998:
+ *
+ *		This section typedefs the old 'native' types to the new PR<type>s.
+ *		These definitions are scheduled to be eliminated at the earliest
+ *		possible time. The NSPR API is implemented and documented using
+ *		the new definitions.
+ *
+ * As there is no opt-out from pulling in these typedefs, we define the guard
+ * for the file to exclude it. This is incredibly ugly, but seems to be about
+ * the only way around it.
+ */
+#define PROTYPES_H
+#include <nspr.h>
+#undef PROTYPES_H
+#include <nss.h>
+#include <prio.h>
+#include <ssl.h>
+#include <sslerr.h>
+#include <secerr.h>
+#include <sslproto.h>
+#include <prtypes.h>
+#include <pk11pub.h>
+#include <secitem.h>
+#include <secport.h>
+#include <secder.h>
+#include <certdb.h>
+#include <base64.h>
+#include <cert.h>
+#include <prerror.h>
+#include <keyhi.h>
+
+typedef struct
+{
+	enum
+	{
+		PW_NONE = 0,
+		PW_FROMFILE = 1,
+		PW_PLAINTEXT = 2,
+		PW_EXTERNAL = 3
+	} source;
+	char *data;
+} secuPWData;
+
+/*
+ * Ensure that the colliding definitions match, else throw an error. In case
+ * NSPR has removed the definition for some reasone, make sure to put ours
+ * back again.
+ */
+#if defined(BITS_PER_BYTE)
+#  if BITS_PER_BYTE != pg_BITS_PER_BYTE
+#    error "incompatible byte widths between NSPR and postgres"
+#  endif
+#else
+#  define BITS_PER_BYTE pg_BITS_PER_BYTE
+#endif
+#undef pg_BITS_PER_BYTE
+
+#include "common/pg_nss.h"
+#include "lib/stringinfo.h"
+#include "libpq/libpq.h"
+#include "nodes/pg_list.h"
+#include "miscadmin.h"
+#include "storage/fd.h"
+#include "utils/guc.h"
+#include "utils/memutils.h"
+
+static PRDescIdentity pr_id;
+
+static PRIOMethods				pr_iomethods;
+static NSSInitContext		   *nss_context = NULL;
+static SSLVersionRange			desired_sslver;
+
+/*
+ * PR_ImportTCPSocket() is a private API, but very widely used, as it's the
+ * only way to make NSS use an already set up POSIX file descriptor rather
+ * than opening one itself. To quote the NSS documentation:
+ *
+ *		"In theory, code that uses PR_ImportTCPSocket may break when NSPR's
+ *		implementation changes. In practice, this is unlikely to happen because
+ *		NSPR's implementation has been stable for years and because of NSPR's
+ *		strong commitment to backward compatibility."
+ *
+ * https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSPR/Reference/PR_ImportTCPSocket
+ *
+ * The function is declared in <private/pprio.h>, but as it is a header marked
+ * private we declare it here rather than including it.
+ */
+NSPR_API(PRFileDesc*) PR_ImportTCPSocket(int);
+
+/* NSS IO layer callback overrides */
+static PRInt32 pg_ssl_read(PRFileDesc *fd, void *buf, PRInt32 amount,
+						   PRIntn flags, PRIntervalTime timeout);
+static PRInt32 pg_ssl_write(PRFileDesc *fd, const void *buf, PRInt32 amount,
+							PRIntn flags, PRIntervalTime timeout);
+/* Utility functions */
+static PRFileDesc *init_iolayer(Port *port, int loglevel);
+static uint16 ssl_protocol_version_to_nss(int v, const char *guc_name);
+
+static char *pg_SSLerrmessage(PRErrorCode errcode);
+static char *ssl_protocol_version_to_string(int v);
+static SECStatus pg_cert_auth_handler(void *arg, PRFileDesc *fd,
+			PRBool checksig, PRBool isServer);
+static SECStatus pg_bad_cert_handler(void *arg, PRFileDesc *fd);
+
+/* ------------------------------------------------------------ */
+/*						 Public interface						*/
+/* ------------------------------------------------------------ */
+
+static char *
+ssl_passphrase_callback(PK11SlotInfo *slot, PRBool retry, void *arg)
+{
+	return pstrdup("");
+}
+
+/*
+ * be_tls_init
+ *			Initialize the nss TLS library in the postmaster
+ *
+ * The majority of the setup needs to happen in be_tls_open_server since the
+ * NSPR initialization must happen after the forking of the backend. We could
+ * potentially move some parts in under !isServerStart, but so far this is the
+ * separation chosen.
+ */
+int
+be_tls_init(bool isServerStart)
+{
+	SECStatus			status;
+	SSLVersionRange		supported_sslver;
+
+	/*
+	 * Set up the connection cache for multi-processing application behavior.
+     * If we are in ServerStart then we initialize the cache. If the server is
+     * already started, we inherit the cache such that it can be used for
+     * connections. Calling SSL_ConfigMPServerSIDCache sets an environment
+     * variable which contains enough information for the forked child to know
+     * how to access it.  Passing NULL to SSL_InheritMPServerSIDCache will make
+     * the forked child look it up by the default name SSL_INHERITANCE, if env
+     * vars aren't inherited then the contents of the variable can be passed
+     * instead.
+	 */
+	if (isServerStart)
+	{
+	    /*
+		 * SSLv2 and SSLv3 are disabled in this TLS backend, but when setting
+		 * up the required session cache for NSS we still must supply timeout
+		 * values for v2 and The minimum allowed value for both is 5
+		 * seconds, so opt for that in both cases (the defaults being 100
+		 * seconds and 24 hours).
+		 *
+		 * Passing NULL as the directory for the session cache will default to
+		 * using /tmp on UNIX and \\temp on Windows.  Deciding if we want to
+		 * keep closer control on this directory is left as a TODO.
+		 */
+		status = SSL_ConfigMPServerSIDCache(MaxConnections, 5, 5, NULL);
+		if (status != SECSuccess)
+			ereport(FATAL,
+					(errmsg("unable to set up TLS connection cache: %s",
+					 		pg_SSLerrmessage(PR_GetError()))));
+
+	}
+	else
+	{
+		status = SSL_InheritMPServerSIDCache(NULL);
+		if (status != SECSuccess)
+		{
+			ereport(LOG,
+					(errmsg("unable to connect to TLS connection cache: %s",
+					 		pg_SSLerrmessage(PR_GetError()))));
+			return -1;
+		}
+	}
+
+	if (!ssl_database || strlen(ssl_database) == 0)
+	{
+		ereport(isServerStart ? FATAL : LOG,
+				(errmsg("no certificate database specified")));
+		goto error;
+	}
+
+	/*
+	 * We check for the desired TLS version range here, even though we cannot
+	 * set it until be_open_server such that we can be compatible with how the
+	 * OpenSSL backend reports errors for incompatible range configurations.
+	 * Set either the default supported TLS version range, or the configured
+	 * range from ssl_min_protocol_version and ssl_max_protocol version. In
+	 * case the user hasn't defined the maximum allowed version we fall back
+	 * to the highest version TLS that the library supports.
+	 */
+	if (SSL_VersionRangeGetSupported(ssl_variant_stream, &supported_sslver) != SECSuccess)
+	{
+		ereport(isServerStart ? FATAL : LOG,
+				(errmsg("unable to get default protocol support from NSS")));
+		goto error;
+	}
+
+	/*
+	 * Set the fallback versions for the TLS protocol version range to a
+	 * combination of our minimal requirement and the library maximum.
+	 */
+	desired_sslver.min = SSL_LIBRARY_VERSION_TLS_1_0;
+	desired_sslver.max = supported_sslver.max;
+
+	if (ssl_min_protocol_version)
+	{
+		int ver = ssl_protocol_version_to_nss(ssl_min_protocol_version,
+											  "ssl_min_protocol_version");
+		if (ver == -1)
+		{
+			ereport(isServerStart ? FATAL : LOG,
+					(errmsg("\"%s\" setting \"%s\" not supported by this build",
+							"ssl_min_protocol_version",
+							GetConfigOption("ssl_min_protocol_version",
+											false, false))));
+			goto error;
+		}
+
+		if (ver > 0)
+			desired_sslver.min = ver;
+	}
+
+	if (ssl_max_protocol_version)
+	{
+		int ver = ssl_protocol_version_to_nss(ssl_max_protocol_version,
+											  "ssl_max_protocol_version");
+		if (ver == -1)
+		{
+			ereport(isServerStart ? FATAL : LOG,
+					(errmsg("\"%s\" setting \"%s\" not supported by this build",
+							"ssl_max_protocol_version",
+							GetConfigOption("ssl_max_protocol_version",
+											false, false))));
+			goto error;
+		}
+		if (ver > 0)
+			desired_sslver.max = ver;
+
+		if (ver < desired_sslver.min)
+		{
+			ereport(isServerStart ? FATAL : LOG,
+					(errmsg("could not set SSL protocol version range"),
+					 errdetail("\"%s\" cannot be higher than \"%s\"",
+							   "ssl_min_protocol_version",
+							   "ssl_max_protocol_version")));
+			goto error;
+		}
+	}
+
+	return 0;
+error:
+	return -1;
+}
+
+int
+be_tls_open_server(Port *port)
+{
+	SECStatus			status;
+	PRFileDesc		   *model;
+	PRFileDesc		   *pr_fd;
+	PRFileDesc		   *layer;
+	CERTCertificate	   *server_cert;
+	SECKEYPrivateKey   *private_key;
+	CERTSignedCrl	   *crl;
+	SECItem				crlname;
+	secuPWData pwdata = { PW_NONE, 0 };		/* TODO: This is a bogus callback */
+	char			   *cert_database;
+	NSSInitParameters	params;
+
+	/*
+	 * The NSPR documentation states that runtime initialization via PR_Init is
+	 * no longer required, as the first caller into NSPR will perform the
+	 * initialization implicitly. The documentation doesn't however clarify
+	 * from which version this is holds true, so let's perform the potentially
+	 * superfluous initialization anyways to avoid crashing on older versions
+	 * of NSPR, as there is no difference in overhead.  The NSS documentation
+	 * still states that PR_Init must be called in some way (implicitly or
+	 * explicitly).
+	 *
+	 * The below parameters are what the implicit initialization would've done
+	 * for us, and should work even for older versions where it might not be
+	 * done automatically. The last parameter, maxPTDs, is set to various
+	 * values in other codebases, but has been unused since NSPR 2.1 which was
+	 * released sometime in 1998.
+	 */
+	PR_Init(PR_USER_THREAD, PR_PRIORITY_NORMAL, 0 /* maxPTDs */);
+
+	/*
+	 * The certificate path (configdir) must contain a valid NSS database.
+	 * If the certificate path isn't a valid directory, NSS will fall back on
+	 * the system certificate database. If the certificate path is a directory
+	 * but is empty then the initialization will fail. On the client side this
+	 * can be allowed for any sslmode but the verify-xxx ones.
+	 * https://bugzilla.redhat.com/show_bug.cgi?id=728562
+	 * For the server side we wont allow this to fail however, as we require
+	 * the certificate and key to exist.
+	 *
+	 * The original design of NSS was for a single application to use a single
+	 * copy of it, initialized with NSS_Initialize() which isn't returning any
+	 * handle with which to refer to NSS. NSS initialization and shutdown are
+	 * global for the application, so a shutdown in another NSS enabled library
+	 * would cause NSS to be stopped for libpq as well.  The fix has been to
+	 * introduce NSS_InitContext which returns a context handle to pass to
+	 * NSS_ShutdownContext.  NSS_InitContext was introduced in NSS 3.12, but
+	 * the use of it is not very well documented.
+	 * https://bugzilla.redhat.com/show_bug.cgi?id=738456
+	 *
+	 * The InitParameters struct passed can be used to override internal values
+	 * in NSS, but the usage is not documented at all. When using NSS_Init
+	 * initializations, the values are instead set via PK11_Configure calls so
+	 * the PK11_Configure documentation can be used to glean some details on
+	 * these.
+	 *
+	 * https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS/PKCS11/Module_Specs
+	 */
+	memset(&params, '\0', sizeof(params));
+	params.length = sizeof(params);
+
+	if (!ssl_database || strlen(ssl_database) == 0)
+		ereport(FATAL,
+				(errmsg("no certificate database specified")));
+
+	cert_database = psprintf("sql:%s", ssl_database);
+	nss_context = NSS_InitContext(cert_database, "", "", "",
+								  &params,
+								  NSS_INIT_READONLY | NSS_INIT_PK11RELOAD);
+	pfree(cert_database);
+
+	if (!nss_context)
+		ereport(FATAL,
+				(errmsg("unable to read certificate database \"%s\": %s",
+				 		ssl_database, pg_SSLerrmessage(PR_GetError()))));
+
+	/*
+	 * Set the passphrase callback which will be used both to obtain the
+	 * passphrase from the user, as well as by NSS to obtain the phrase
+	 * repeatedly.
+	 *
+	 * TODO: Figure this out - do note that we are setting another password
+	 * callback below for cert/key as well. Need to make sense of all these.
+	 */
+	PK11_SetPasswordFunc(ssl_passphrase_callback);
+
+	/*
+	 * Import the already opened socket as we don't want to use NSPR functions
+	 * for opening the network socket due to how the PostgreSQL protocol works
+	 * with TLS connections. This function is not part of the NSPR public API,
+	 * see the comment at the top of the file for the rationale of still using
+	 * it.
+	 */
+	pr_fd = PR_ImportTCPSocket(port->sock);
+	if (!pr_fd)
+		ereport(ERROR,
+				(errmsg("unable to connect to socket")));
+
+	/*
+	 * Most of the documentation available, and implementations of, NSS/NSPR
+	 * use the PR_NewTCPSocket() function here, which has the drawback that it
+	 * can only create IPv4 sockets. Instead use PR_OpenTCPSocket() which copes
+	 * with IPv6 as well.
+	 */
+	model = PR_OpenTCPSocket(port->laddr.addr.ss_family);
+	if (!model)
+		ereport(ERROR,
+				(errmsg("unable to open socket")));
+
+	/*
+	 * Convert the NSPR socket to an SSL socket. Ensuring the success of this
+	 * operation is critical as NSS SSL_* functions may return SECSuccess on
+	 * the socket even though SSL hasn't been enabled, which introduce a risk
+	 * of silent downgrades.
+	 */
+	model = SSL_ImportFD(NULL, model);
+	if (!model)
+		ereport(ERROR,
+				(errmsg("unable to enable TLS on socket")));
+
+	/*
+	 * Configure basic settings for the connection over the SSL socket in
+	 * order to set it up as a server.
+	 */
+	if (SSL_OptionSet(model, SSL_SECURITY, PR_TRUE) != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to configure TLS connection")));
+
+	if (SSL_OptionSet(model, SSL_HANDSHAKE_AS_SERVER, PR_TRUE) != SECSuccess ||
+		SSL_OptionSet(model, SSL_HANDSHAKE_AS_CLIENT, PR_FALSE) != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to configure TLS connection as server")));
+
+	/*
+	 * SSLv2 is disabled by default, and SSLv3 will be excluded from the range
+	 * of allowed protocols further down. Since we really don't want these to
+	 * ever be enabled, let's use belts and suspenders and explicitly turn
+	 * them off as well.
+	 */
+	SSL_OptionSet(model, SSL_ENABLE_SSL2, PR_FALSE);
+	SSL_OptionSet(model, SSL_ENABLE_SSL3, PR_FALSE);
+
+#ifdef SSL_CBC_RANDOM_IV
+	/*
+	 * Enable protection against the BEAST attack in case the NSS server has
+	 * support for that. While SSLv3 is disabled, we may still allow TLSv1
+	 * which is affected. The option isn't documented as an SSL option, but as
+	 * an NSS environment variable.
+	 */
+	SSL_OptionSet(model, SSL_CBC_RANDOM_IV, PR_TRUE);
+#endif
+
+	/*
+	 * Configure the allowed cipher. If there are no user preferred suites, set
+	 * the domestic policy. TODO: while this code works, the set of ciphers
+	 * which can be set and still end up with a working socket is woefully
+	 * underdocumented for anything more recent than SSLv3 (the code for TLS
+	 * actually calls ssl3 functions under the hood for SSL_CipherPrefSet),
+	 * so it's unclear if this is helpful or not. Using the policies works,
+	 * but may be too coarsely grained.
+	 *
+	 * Another TODO: The SSL_ImplementedCiphers table returned with calling
+	 * SSL_GetImplementedCiphers is sorted in server preference order. Sorting
+	 * SSLCipherSuites according to the order of the ciphers therein could be
+	 * a way to implement ssl_prefer_server_ciphers - if we at all want to use
+	 * cipher selection for NSS like how we do it for OpenSSL that is.
+	 */
+
+	/*
+	 * If no ciphers are specified, we use the domestic policy
+	 */
+	if (!SSLCipherSuites || strlen(SSLCipherSuites) == 0)
+	{
+		status = NSS_SetDomesticPolicy();
+		if (status != SECSuccess)
+			ereport(ERROR,
+					(errmsg("unable to set cipher policy: %s",
+							pg_SSLerrmessage(PR_GetError()))));
+	}
+	else
+	{
+		char		   *ciphers, *c, *b;
+		char		   *sep = ":;, ";
+		PRUint16		ciphercode;
+		const PRUint16 *nss_ciphers;
+
+		/*
+		 * If the user has specified a set of preferred cipher suites we start
+		 * by turning off all the existing suites to avoid the risk of down-
+		 * grades to a weaker cipher than expected.
+		 */
+		nss_ciphers = SSL_GetImplementedCiphers();
+		for (int i = 0; i < SSL_GetNumImplementedCiphers(); i++)
+			SSL_CipherPrefSet(model, nss_ciphers[i], PR_FALSE);
+
+		ciphers = pstrdup(SSLCipherSuites);
+
+		for (c = strtok_r(ciphers, sep, &b); c; c = strtok_r(NULL, sep, &b))
+		{
+			ciphercode = pg_find_cipher(c);
+			if (ciphercode != INVALID_CIPHER)
+			{
+				status = SSL_CipherPrefSet(model, ciphercode, PR_TRUE);
+				if (status != SECSuccess)
+					ereport(ERROR,
+							(errmsg("invalid cipher-suite specified: %s", c)));
+			}
+		}
+
+		pfree(ciphers);
+	}
+
+	if (SSL_VersionRangeSet(model, &desired_sslver) != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to set requested SSL protocol version range")));
+
+	/*
+	 * Set up the custom IO layer.
+	 */
+	layer = init_iolayer(port, ERROR);
+	if (!layer)
+		goto error;
+
+	/* Store the Port as private data available in callbacks */
+	layer->secret = (void *) port;
+
+	if (PR_PushIOLayer(pr_fd, PR_TOP_IO_LAYER, layer) != PR_SUCCESS)
+	{
+		PR_Close(layer);
+		ereport(ERROR,
+				(errmsg("unable to push IO layer")));
+	}
+
+	/* TODO: set the postgres password callback param as callback function */
+	server_cert = PK11_FindCertFromNickname(ssl_cert_file, &pwdata /* password callback */);
+	if (!server_cert)
+		ereport(ERROR,
+				(errmsg("unable to find certificate for \"%s\": %s",
+						ssl_cert_file, pg_SSLerrmessage(PR_GetError()))));
+
+	/* TODO: set the postgres password callback param as callback function */
+	private_key = PK11_FindKeyByAnyCert(server_cert, &pwdata /* password callback */);
+	if (!private_key)
+		ereport(ERROR,
+				(errmsg("unable to find private key for \"%s\": %s",
+						ssl_cert_file, pg_SSLerrmessage(PR_GetError()))));
+
+	/*
+	 * NSS doesn't use CRL files on disk, so we use the ssl_crl_file guc to
+	 * contain the CRL nickname for the current server certificate in the NSS
+	 * certificate database. The main difference from the OpenSSL backend is
+	 * that NSS will use the CRL regardless, but being able to make sure the
+	 * CRL is loaded seems like a good feature.
+	 */
+	if (ssl_crl_file[0])
+	{
+		SECITEM_CopyItem(NULL, &crlname, &server_cert->derSubject);
+		crl = SEC_FindCrlByName(CERT_GetDefaultCertDB(), &crlname, SEC_CRL_TYPE);
+		if (!crl)
+			ereport(ERROR,
+					(errmsg("specified CRL not found in database")));
+		SEC_DestroyCrl(crl);
+	}
+
+	/*
+	 * Finally we must configure the socket for being a server by setting the
+	 * certificate and key.
+	 */
+	status = SSL_ConfigSecureServer(model, server_cert, private_key, kt_rsa);
+	if (status != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to configure secure server: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+	status = SSL_ConfigServerCert(model, server_cert, private_key, NULL, 0);
+	if (status != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to configure server for TLS server connections: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+
+	ssl_loaded_verify_locations = true;
+
+	/*
+	 * At this point, we no longer have use for the certificate and private
+	 * key as they have been copied into the context by NSS. Destroy our
+	 * copies explicitly to clean out the memory as best we can.
+	 */
+	CERT_DestroyCertificate(server_cert);
+	SECKEY_DestroyPrivateKey(private_key);
+
+	status = SSL_AuthCertificateHook(model, pg_cert_auth_handler, (void *) port);
+	if (status != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to install authcert hook: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+	SSL_BadCertHook(model, pg_bad_cert_handler, (void *) port);
+	SSL_OptionSet(model, SSL_REQUEST_CERTIFICATE, PR_TRUE);
+	SSL_OptionSet(model, SSL_REQUIRE_CERTIFICATE, PR_FALSE);
+
+	port->pr_fd = SSL_ImportFD(model, pr_fd);
+	if (!port->pr_fd)
+		ereport(ERROR,
+				(errmsg("unable to initialize")));
+
+	PR_Close(model);
+
+	/*
+	 * Force a handshake on the next I/O request, the second parameter means
+	 * that we are a server, PR_FALSE would indicate being a client. NSPR
+	 * requires us to call SSL_ResetHandshake since we imported an already
+	 * established socket.
+	 */
+	status = SSL_ResetHandshake(port->pr_fd, PR_TRUE);
+	if (status != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to initiate handshake: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+	status = SSL_ForceHandshake(port->pr_fd);
+	if (status != SECSuccess)
+		ereport(ERROR,
+			(errmsg("unable to handshake: %s",
+					pg_SSLerrmessage(PR_GetError()))));
+
+	port->ssl_in_use = true;
+	return 0;
+
+error:
+	return 1;
+}
+
+ssize_t
+be_tls_read(Port *port, void *ptr, size_t len, int *waitfor)
+{
+	ssize_t			n_read;
+	PRErrorCode		err;
+
+	n_read = PR_Read(port->pr_fd, ptr, len);
+
+	if (n_read < 0)
+	{
+		err = PR_GetError();
+
+		/* XXX: This logic seems potentially bogus? */
+		if (err == PR_WOULD_BLOCK_ERROR)
+			*waitfor = WL_SOCKET_READABLE;
+		else
+			*waitfor = WL_SOCKET_WRITEABLE;
+	}
+
+	return n_read;
+}
+
+ssize_t
+be_tls_write(Port *port, void *ptr, size_t len, int *waitfor)
+{
+	ssize_t			n_write;
+	PRErrorCode		err;
+
+	n_write = PR_Send(port->pr_fd, ptr, len, 0, PR_INTERVAL_NO_WAIT);
+
+	if (n_write < 0)
+	{
+		err = PR_GetError();
+
+		if (err == PR_WOULD_BLOCK_ERROR)
+			*waitfor = WL_SOCKET_WRITEABLE;
+		else
+			*waitfor = WL_SOCKET_READABLE;
+	}
+
+	return n_write;
+}
+
+void
+be_tls_close(Port *port)
+{
+	if (!port)
+		return;
+
+	if (port->peer_cn)
+	{
+		SSL_InvalidateSession(port->pr_fd);
+		pfree(port->peer_cn);
+		port->peer_cn = NULL;
+	}
+
+	PR_Close(port->pr_fd);
+	port->pr_fd = NULL;
+	port->ssl_in_use = false;
+
+	if (nss_context)
+	{
+		NSS_ShutdownContext(nss_context);
+		nss_context = NULL;
+	}
+}
+
+void
+be_tls_destroy(void)
+{
+	/*
+	 * It reads a bit odd to clear a session cache when we are destroying the
+	 * context altogether, but if the session cache isn't cleared before
+	 * shutting down the context it will fail with SEC_ERROR_BUSY.
+	 */
+	SSL_ClearSessionCache();
+}
+
+int
+be_tls_get_cipher_bits(Port *port)
+{
+	SECStatus			status;
+	SSLChannelInfo		channel;
+	SSLCipherSuiteInfo	suite;
+
+	status = SSL_GetChannelInfo(port->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+		goto error;
+
+	status = SSL_GetCipherSuiteInfo(channel.cipherSuite, &suite, sizeof(suite));
+	if (status != SECSuccess)
+		goto error;
+
+	return suite.effectiveKeyBits;
+
+error:
+	ereport(WARNING,
+			(errmsg("unable to extract TLS session information: %s",
+					pg_SSLerrmessage(PR_GetError()))));
+	return 0;
+}
+
+/*
+ * be_tls_get_compression
+ *
+ * NSS disabled support for TLS compression in version 3.33 and removed the
+ * code in a subsequent release. The API for retrieving information about
+ * compression as well as enabling it is kept for backwards compatibility, but
+ * we don't need to consult it since it was only available for SSLv3 which we
+ * don't support.
+ *
+ * https://bugzilla.mozilla.org/show_bug.cgi?id=1409587
+ */
+bool
+be_tls_get_compression(Port *port)
+{
+	return false;
+}
+
+const char *
+be_tls_get_version(Port *port)
+{
+	SECStatus			status;
+	SSLChannelInfo		channel;
+
+	status = SSL_GetChannelInfo(port->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+	{
+		ereport(WARNING,
+				(errmsg("unable to extract TLS session information: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+		return NULL;
+	}
+
+	return ssl_protocol_version_to_string(channel.protocolVersion);
+}
+
+const char *
+be_tls_get_cipher(Port *port)
+{
+	SECStatus			status;
+	SSLChannelInfo		channel;
+	SSLCipherSuiteInfo	suite;
+
+	status = SSL_GetChannelInfo(port->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+		goto error;
+
+	status = SSL_GetCipherSuiteInfo(channel.cipherSuite, &suite, sizeof(suite));
+	if (status != SECSuccess)
+		goto error;
+
+	return suite.cipherSuiteName;
+
+error:
+	ereport(WARNING,
+			(errmsg("unable to extract TLS session information: %s",
+					pg_SSLerrmessage(PR_GetError()))));
+	return NULL;
+}
+
+void
+be_tls_get_peer_subject_name(Port *port, char *ptr, size_t len)
+{
+	CERTCertificate	   *certificate;
+
+	certificate = SSL_PeerCertificate(port->pr_fd);
+	if (certificate)
+		strlcpy(ptr, CERT_NameToAscii(&certificate->subject), len);
+	else
+		ptr[0] = '\0';
+}
+
+void
+be_tls_get_peer_issuer_name(Port *port, char *ptr, size_t len)
+{
+	CERTCertificate	    *certificate;
+
+	certificate = SSL_PeerCertificate(port->pr_fd);
+	if (certificate)
+		strlcpy(ptr, CERT_NameToAscii(&certificate->issuer), len);
+	else
+		ptr[0] = '\0';
+}
+
+void
+be_tls_get_peer_serial(Port *port, char *ptr, size_t len)
+{
+	CERTCertificate	   *certificate;
+
+	certificate = SSL_PeerCertificate(port->pr_fd);
+	if (certificate)
+		snprintf(ptr, len, "%li", DER_GetInteger(&(certificate->serialNumber)));
+	else
+		ptr[0] = '\0';
+}
+
+static SECStatus
+pg_bad_cert_handler(void *arg, PRFileDesc *fd)
+{
+	Port			   *port = (Port *) arg;
+
+	port->peer_cert_valid = false;
+	return SECFailure;
+}
+
+static SECStatus
+pg_cert_auth_handler(void *arg, PRFileDesc *fd, PRBool checksig, PRBool isServer)
+{
+	SECStatus			status;
+	Port			   *port = (Port *) arg;
+	CERTCertificate	   *cert;
+	char			   *peer_cn;
+	int					len;
+
+	status = SSL_AuthCertificate(CERT_GetDefaultCertDB(), port->pr_fd, checksig, PR_TRUE);
+	if (status == SECSuccess)
+	{
+		cert = SSL_PeerCertificate(port->pr_fd);
+		len = strlen(cert->subjectName);
+		peer_cn = MemoryContextAllocZero(TopMemoryContext, len + 1);
+		if (strncmp(cert->subjectName, "CN=", 3) == 0)
+			strlcpy(peer_cn, cert->subjectName + strlen("CN="), len + 1);
+		else
+			strlcpy(peer_cn, cert->subjectName, len + 1);
+		CERT_DestroyCertificate(cert);
+
+		port->peer_cn = peer_cn;
+		port->peer_cert_valid = true;
+	}
+
+	return status;
+}
+
+/* ------------------------------------------------------------ */
+/*						Internal functions						*/
+/* ------------------------------------------------------------ */
+
+static PRInt32
+pg_ssl_read(PRFileDesc *fd, void *buf, PRInt32 amount, PRIntn flags,
+			PRIntervalTime timeout)
+{
+	PRRecvFN		read_fn;
+	PRInt32			n_read;
+
+	read_fn = fd->lower->methods->recv;
+	n_read = read_fn(fd->lower, buf, amount, flags, timeout);
+
+	return n_read;
+}
+
+static PRInt32
+pg_ssl_write(PRFileDesc *fd, const void *buf, PRInt32 amount, PRIntn flags,
+			 PRIntervalTime timeout)
+{
+	PRSendFN		send_fn;
+	PRInt32			n_write;
+
+	send_fn = fd->lower->methods->send;
+	n_write = send_fn(fd->lower, buf, amount, flags, timeout);
+
+	return n_write;
+}
+
+static PRFileDesc *
+init_iolayer(Port *port, int loglevel)
+{
+	const PRIOMethods	   *default_methods;
+	PRFileDesc			   *layer;
+
+	/*
+	 * Start by initializing our layer with all the default methods so that
+	 * we can selectively override the ones we want while still ensuring that
+	 * we have a complete layer specification.
+	 */
+	default_methods = PR_GetDefaultIOMethods();
+	memcpy(&pr_iomethods, default_methods, sizeof(PRIOMethods));
+
+	pr_iomethods.recv = pg_ssl_read;
+	pr_iomethods.send = pg_ssl_write;
+
+	/*
+	 * Each IO layer must be identified by a unique name, where uniqueness is
+	 * per connection. Each connection in a postgres cluster can generate the
+	 * identity from the same string as they will create their IO layers on
+	 * different sockets. Only one layer per socket can have the same name.
+	 */
+	pr_id = PR_GetUniqueIdentity("PostgreSQL");
+	if (pr_id == PR_INVALID_IO_LAYER)
+	{
+		ereport(loglevel,
+				(errmsg("out of memory when setting up TLS connection")));
+		return NULL;
+	}
+
+	/*
+	 * Create the actual IO layer as a stub such that it can be pushed onto
+	 * the layer stack. The step via a stub is required as we define custom
+	 * callbacks.
+	 */
+	layer = PR_CreateIOLayerStub(pr_id, &pr_iomethods);
+	if (!layer)
+	{
+		ereport(loglevel,
+				(errmsg("unable to create NSS I/O layer")));
+		return NULL;
+	}
+
+	return layer;
+}
+
+static char *
+ssl_protocol_version_to_string(int v)
+{
+	switch(v)
+	{
+		/* SSL v2 and v3 are not supported */
+		case SSL_LIBRARY_VERSION_2:
+		case SSL_LIBRARY_VERSION_3_0:
+			Assert(false);
+			break;
+
+		case SSL_LIBRARY_VERSION_TLS_1_0:
+			return pstrdup("TLSv1.0");
+		case SSL_LIBRARY_VERSION_TLS_1_1:
+			return pstrdup("TLSv1.1");
+		case SSL_LIBRARY_VERSION_TLS_1_2:
+			return pstrdup("TLSv1.2");
+		case SSL_LIBRARY_VERSION_TLS_1_3:
+			return pstrdup("TLSv1.3");
+	}
+
+	return pstrdup("unknown");
+}
+
+
+/*
+ * ssl_protocol_version_to_nss
+ *			Translate PostgreSQL TLS version to NSS version
+ *
+ * Returns zero in case the requested TLS version is undefined (PG_ANY) and
+ * should be set by the caller, or -1 on failure.
+ */
+static uint16
+ssl_protocol_version_to_nss(int v, const char *guc_name)
+{
+	switch(v)
+	{
+		/*
+		 * There is no SSL_LIBRARY_ macro defined in NSS with the value zero,
+		 * so we use this to signal the caller that the highest useful version
+		 * should be set on the connection.
+		 */
+		case PG_TLS_ANY:
+			return 0;
+		/*
+		 * No guard is required here as there are no versions of NSS without
+		 * support for TLS1.
+		 */
+		case PG_TLS1_VERSION:
+			return SSL_LIBRARY_VERSION_TLS_1_0;
+		case PG_TLS1_1_VERSION:
+#ifdef SSL_LIBRARY_VERSION_TLS_1_1
+			return SSL_LIBRARY_VERSION_TLS_1_1;
+#else
+			break;
+#endif
+		case PG_TLS1_2_VERSION:
+#ifdef SSL_LIBRARY_VERSION_TLS_1_2
+			return SSL_LIBRARY_VERSION_TLS_1_2;
+#else
+			break;
+#endif
+		case PG_TLS1_3_VERSION:
+#ifdef SSL_LIBRARY_VERSION_TLS_1_3
+			return SSL_LIBRARY_VERSION_TLS_1_3;
+#else
+			break;
+#endif
+		default:
+			break;
+	}
+
+	return -1;
+}
+
+/*
+ * pg_SSLerrmessage
+ *		Create and return a human readable error message given
+ *		the specified error code
+ *
+ * PR_ErrorToName only converts the enum identifier of the error to string,
+ * but that can be quite useful for debugging (and in case PR_ErrorToString is
+ * unable to render a message then we at least have something).
+ */
+static char *
+pg_SSLerrmessage(PRErrorCode errcode)
+{
+	char		error[128];
+	int 		ret;
+
+	/* TODO: this should perhaps use a StringInfo instead.. */
+	ret = pg_snprintf(error, sizeof(error), "%s (%s)",
+					  PR_ErrorToString(errcode, PR_LANGUAGE_I_DEFAULT),
+					  PR_ErrorToName(errcode));
+	if (ret)
+		return pstrdup(error);
+
+	return pstrdup(_("unknown TLS error"));
+}
diff --git a/src/backend/libpq/be-secure.c b/src/backend/libpq/be-secure.c
index 2ae507a902..f39977b80c 100644
--- a/src/backend/libpq/be-secure.c
+++ b/src/backend/libpq/be-secure.c
@@ -49,6 +49,9 @@ bool		ssl_passphrase_command_supports_reload;
 #ifdef USE_SSL
 bool		ssl_loaded_verify_locations = false;
 #endif
+#ifdef USE_NSS
+char	   *ssl_database;
+#endif
 
 /* GUC variable controlling SSL cipher list */
 char	   *SSLCipherSuites = NULL;
diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c
index 75fc6f11d6..6153745f07 100644
--- a/src/backend/utils/misc/guc.c
+++ b/src/backend/utils/misc/guc.c
@@ -4233,7 +4233,11 @@ static struct config_string ConfigureNamesString[] =
 		},
 		&ssl_library,
 #ifdef USE_SSL
+#if defined(USE_OPENSSL)
 		"OpenSSL",
+#elif defined(USE_NSS)
+		"NSS",
+#endif
 #else
 		"",
 #endif
@@ -4291,6 +4295,18 @@ static struct config_string ConfigureNamesString[] =
 		check_canonical_path, assign_pgstat_temp_directory, NULL
 	},
 
+#ifdef USE_NSS
+	{
+		{"ssl_database", PGC_SIGHUP, CONN_AUTH_SSL,
+			gettext_noop("Location of the NSS certificate database."),
+			NULL
+		},
+		&ssl_database,
+		"",
+		NULL, NULL, NULL
+	},
+#endif
+
 	{
 		{"synchronous_standby_names", PGC_SIGHUP, REPLICATION_MASTER,
 			gettext_noop("Number of synchronous standbys and list of names of potential synchronous ones."),
@@ -4319,8 +4335,10 @@ static struct config_string ConfigureNamesString[] =
 			GUC_SUPERUSER_ONLY
 		},
 		&SSLCipherSuites,
-#ifdef USE_OPENSSL
+#if defined(USE_OPENSSL)
 		"HIGH:MEDIUM:+3DES:!aNULL",
+#elif defined (USE_NSS)
+		"",
 #else
 		"none",
 #endif
diff --git a/src/include/common/pg_nss.h b/src/include/common/pg_nss.h
new file mode 100644
index 0000000000..3a0e9cb453
--- /dev/null
+++ b/src/include/common/pg_nss.h
@@ -0,0 +1,141 @@
+/*-------------------------------------------------------------------------
+ *
+ * pg_nss.h
+ *	  Support for NSS as a TLS backend
+ *
+ * These definitions are used by both frontend and backend code.
+ *
+ * Copyright (c) 2020, PostgreSQL Global Development Group
+ *
+ * IDENTIFICATION
+ *        src/include/common/pg_nss.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef PG_NSS_H
+#define PG_NSS_H
+
+#ifdef USE_NSS
+
+#include <sslproto.h>
+
+PRUint16 pg_find_cipher(char *name);
+
+typedef struct
+{
+    const char     *name;
+    PRUint16        number;
+} NSSCiphers;
+
+#define INVALID_CIPHER	0xFFFF
+
+/*
+ * This list is a partial copy of the ciphers in NSS files lib/ssl/sslproto.h
+ * in order to provide a human readable version of the ciphers. It would be
+ * nice to not have to have this, but NSS doesn't provide any API addressing
+ * the ciphers by name. TODO: do we want more of the ciphers, or perhaps less?
+ */
+static const NSSCiphers NSS_CipherList[] = {
+
+    {"TLS_NULL_WITH_NULL_NULL", TLS_NULL_WITH_NULL_NULL},
+
+	{"TLS_RSA_WITH_NULL_MD5", TLS_RSA_WITH_NULL_MD5},
+	{"TLS_RSA_WITH_NULL_SHA", TLS_RSA_WITH_NULL_SHA},
+	{"TLS_RSA_WITH_RC4_128_MD5", TLS_RSA_WITH_RC4_128_MD5},
+	{"TLS_RSA_WITH_RC4_128_SHA", TLS_RSA_WITH_RC4_128_SHA},
+	{"TLS_RSA_WITH_IDEA_CBC_SHA", TLS_RSA_WITH_IDEA_CBC_SHA},
+	{"TLS_RSA_WITH_DES_CBC_SHA", TLS_RSA_WITH_DES_CBC_SHA},
+	{"TLS_RSA_WITH_3DES_EDE_CBC_SHA", TLS_RSA_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_DH_DSS_WITH_DES_CBC_SHA", TLS_DH_DSS_WITH_DES_CBC_SHA},
+	{"TLS_DH_DSS_WITH_3DES_EDE_CBC_SHA", TLS_DH_DSS_WITH_3DES_EDE_CBC_SHA},
+	{"TLS_DH_RSA_WITH_DES_CBC_SHA", TLS_DH_RSA_WITH_DES_CBC_SHA},
+	{"TLS_DH_RSA_WITH_3DES_EDE_CBC_SHA", TLS_DH_RSA_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_DHE_DSS_WITH_DES_CBC_SHA", TLS_DHE_DSS_WITH_DES_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_3DES_EDE_CBC_SHA", TLS_DHE_DSS_WITH_3DES_EDE_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_DES_CBC_SHA", TLS_DHE_RSA_WITH_DES_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA", TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_DH_anon_WITH_RC4_128_MD5", TLS_DH_anon_WITH_RC4_128_MD5},
+	{"TLS_DH_anon_WITH_DES_CBC_SHA", TLS_DH_anon_WITH_DES_CBC_SHA},
+	{"TLS_DH_anon_WITH_3DES_EDE_CBC_SHA", TLS_DH_anon_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_RSA_WITH_AES_128_CBC_SHA", TLS_RSA_WITH_AES_128_CBC_SHA},
+	{"TLS_DH_DSS_WITH_AES_128_CBC_SHA", TLS_DH_DSS_WITH_AES_128_CBC_SHA},
+	{"TLS_DH_RSA_WITH_AES_128_CBC_SHA", TLS_DH_RSA_WITH_AES_128_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_AES_128_CBC_SHA", TLS_DHE_DSS_WITH_AES_128_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_AES_128_CBC_SHA", TLS_DHE_RSA_WITH_AES_128_CBC_SHA},
+	{"TLS_DH_anon_WITH_AES_128_CBC_SHA", TLS_DH_anon_WITH_AES_128_CBC_SHA},
+
+	{"TLS_RSA_WITH_AES_256_CBC_SHA", TLS_RSA_WITH_AES_256_CBC_SHA},
+	{"TLS_DH_DSS_WITH_AES_256_CBC_SHA", TLS_DH_DSS_WITH_AES_256_CBC_SHA},
+	{"TLS_DH_RSA_WITH_AES_256_CBC_SHA", TLS_DH_RSA_WITH_AES_256_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_AES_256_CBC_SHA", TLS_DHE_DSS_WITH_AES_256_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_AES_256_CBC_SHA", TLS_DHE_RSA_WITH_AES_256_CBC_SHA},
+	{"TLS_DH_anon_WITH_AES_256_CBC_SHA", TLS_DH_anon_WITH_AES_256_CBC_SHA},
+	{"TLS_RSA_WITH_NULL_SHA256", TLS_RSA_WITH_NULL_SHA256},
+	{"TLS_RSA_WITH_AES_128_CBC_SHA256", TLS_RSA_WITH_AES_128_CBC_SHA256},
+	{"TLS_RSA_WITH_AES_256_CBC_SHA256", TLS_RSA_WITH_AES_256_CBC_SHA256},
+
+	{"TLS_DHE_DSS_WITH_AES_128_CBC_SHA256", TLS_DHE_DSS_WITH_AES_128_CBC_SHA256},
+	{"TLS_RSA_WITH_CAMELLIA_128_CBC_SHA", TLS_RSA_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DH_DSS_WITH_CAMELLIA_128_CBC_SHA", TLS_DH_DSS_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DH_RSA_WITH_CAMELLIA_128_CBC_SHA", TLS_DH_RSA_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_CAMELLIA_128_CBC_SHA", TLS_DHE_DSS_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA", TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DH_anon_WITH_CAMELLIA_128_CBC_SHA", TLS_DH_anon_WITH_CAMELLIA_128_CBC_SHA},
+
+	{"TLS_DHE_DSS_WITH_RC4_128_SHA", TLS_DHE_DSS_WITH_RC4_128_SHA},
+	{"TLS_DHE_RSA_WITH_AES_128_CBC_SHA256", TLS_DHE_RSA_WITH_AES_128_CBC_SHA256},
+	{"TLS_DHE_DSS_WITH_AES_256_CBC_SHA256", TLS_DHE_DSS_WITH_AES_256_CBC_SHA256},
+	{"TLS_DHE_RSA_WITH_AES_256_CBC_SHA256", TLS_DHE_RSA_WITH_AES_256_CBC_SHA256},
+
+	{"TLS_RSA_WITH_CAMELLIA_256_CBC_SHA", TLS_RSA_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DH_DSS_WITH_CAMELLIA_256_CBC_SHA", TLS_DH_DSS_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DH_RSA_WITH_CAMELLIA_256_CBC_SHA", TLS_DH_RSA_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_CAMELLIA_256_CBC_SHA", TLS_DHE_DSS_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA", TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DH_anon_WITH_CAMELLIA_256_CBC_SHA", TLS_DH_anon_WITH_CAMELLIA_256_CBC_SHA},
+
+	{"TLS_RSA_WITH_SEED_CBC_SHA", TLS_RSA_WITH_SEED_CBC_SHA},
+
+	{"TLS_RSA_WITH_AES_128_GCM_SHA256", TLS_RSA_WITH_AES_128_GCM_SHA256},
+	{"TLS_RSA_WITH_AES_256_GCM_SHA384", TLS_RSA_WITH_AES_256_GCM_SHA384},
+	{"TLS_DHE_RSA_WITH_AES_128_GCM_SHA256", TLS_DHE_RSA_WITH_AES_128_GCM_SHA256},
+	{"TLS_DHE_RSA_WITH_AES_256_GCM_SHA384", TLS_DHE_RSA_WITH_AES_256_GCM_SHA384},
+	{"TLS_DHE_DSS_WITH_AES_128_GCM_SHA256", TLS_DHE_DSS_WITH_AES_128_GCM_SHA256},
+	{"TLS_DHE_DSS_WITH_AES_256_GCM_SHA384", TLS_DHE_DSS_WITH_AES_256_GCM_SHA384},
+
+	{"TLS_AES_128_GCM_SHA256", TLS_AES_128_GCM_SHA256},
+	{"TLS_AES_256_GCM_SHA384", TLS_AES_256_GCM_SHA384},
+	{"TLS_CHACHA20_POLY1305_SHA256", TLS_CHACHA20_POLY1305_SHA256},
+	{NULL, 0}
+};
+
+/*
+ * pg_find_cipher
+ *			Translate an NSS ciphername to the cipher code
+ *
+ * Searches the configured ciphers for the corresponding cipher code to the
+ * name. Search is performed case insensitive.
+ */
+PRUint16
+pg_find_cipher(char *name)
+{
+	const NSSCiphers	*cipher_list = NSS_CipherList;
+
+	while (cipher_list->name)
+	{
+		if (pg_strcasecmp(cipher_list->name, name) == 0)
+			return cipher_list->number;
+
+		cipher_list++;
+	}
+
+	return 0xFFFF;
+}
+
+#endif							/* USE_NSS */
+
+#endif							/* PG_NSS_H */
diff --git a/src/include/libpq/libpq-be.h b/src/include/libpq/libpq-be.h
index 179ebaa104..fc2f16d847 100644
--- a/src/include/libpq/libpq-be.h
+++ b/src/include/libpq/libpq-be.h
@@ -192,13 +192,18 @@ typedef struct Port
 	bool		peer_cert_valid;
 
 	/*
-	 * OpenSSL structures. (Keep these last so that the locations of other
-	 * fields are the same whether or not you build with OpenSSL.)
+	 * SSL backend specific structures. (Keep these last so that the locations
+	 * of other fields are the same whether or not you build with SSL enabled.)
 	 */
 #ifdef USE_OPENSSL
 	SSL		   *ssl;
 	X509	   *peer;
 #endif
+
+#ifdef USE_NSS
+	//void	   *ssl;
+	void	   *pr_fd;
+#endif
 } Port;
 
 #ifdef USE_SSL
diff --git a/src/include/libpq/libpq.h b/src/include/libpq/libpq.h
index b1152475ac..298d87ecae 100644
--- a/src/include/libpq/libpq.h
+++ b/src/include/libpq/libpq.h
@@ -88,6 +88,9 @@ extern PGDLLIMPORT bool ssl_passphrase_command_supports_reload;
 #ifdef USE_SSL
 extern bool ssl_loaded_verify_locations;
 #endif
+#ifdef USE_NSS
+extern char *ssl_database;
+#endif
 
 extern int	secure_initialize(bool isServerStart);
 extern bool secure_loaded_verify_locations(void);
diff --git a/src/include/pg_config.h.in b/src/include/pg_config.h.in
index c199cd46d2..dba1443758 100644
--- a/src/include/pg_config.h.in
+++ b/src/include/pg_config.h.in
@@ -889,6 +889,9 @@
 /* Define to 1 to build with PAM support. (--with-pam) */
 #undef USE_PAM
 
+/* Define to build with NSS support (--with-nss) */
+#undef USE_NSS
+
 /* Define to 1 to use software CRC-32C implementation (slicing-by-8). */
 #undef USE_SLICING_BY_8_CRC32C
 
diff --git a/src/include/pg_config_manual.h b/src/include/pg_config_manual.h
index 8f3ec6bde1..2a5b59b998 100644
--- a/src/include/pg_config_manual.h
+++ b/src/include/pg_config_manual.h
@@ -176,10 +176,9 @@
 
 /*
  * USE_SSL code should be compiled only when compiling with an SSL
- * implementation.  (Currently, only OpenSSL is supported, but we might add
- * more implementations in the future.)
+ * implementation.
  */
-#ifdef USE_OPENSSL
+#if defined(USE_OPENSSL) || defined(USE_NSS)
 #define USE_SSL
 #endif
 
diff --git a/src/interfaces/libpq/Makefile b/src/interfaces/libpq/Makefile
index d4919970f8..97821fb39b 100644
--- a/src/interfaces/libpq/Makefile
+++ b/src/interfaces/libpq/Makefile
@@ -57,6 +57,10 @@ OBJS += \
 	fe-secure-gssapi.o
 endif
 
+ifeq ($(with_nss), yes)
+OBJS += fe-secure-nss.o
+endif
+
 ifeq ($(PORTNAME), cygwin)
 override shlib = cyg$(NAME)$(DLSUFFIX)
 endif
diff --git a/src/interfaces/libpq/fe-connect.c b/src/interfaces/libpq/fe-connect.c
index 2c87b34028..848132976c 100644
--- a/src/interfaces/libpq/fe-connect.c
+++ b/src/interfaces/libpq/fe-connect.c
@@ -354,6 +354,12 @@ static const internalPQconninfoOption PQconninfoOptions[] = {
 		"Target-Session-Attrs", "", 11, /* sizeof("read-write") = 11 */
 	offsetof(struct pg_conn, target_session_attrs)},
 
+#if defined(USE_NSS)
+	{"cert_database", NULL, NULL, NULL,
+		"CertificateDatabase", "", 64,
+	offsetof(struct pg_conn, cert_database)},
+#endif
+
 	/* Terminating entry --- MUST BE LAST */
 	{NULL, NULL, NULL, NULL,
 	NULL, NULL, 0}
diff --git a/src/interfaces/libpq/fe-secure-nss.c b/src/interfaces/libpq/fe-secure-nss.c
new file mode 100644
index 0000000000..b707c0f8ea
--- /dev/null
+++ b/src/interfaces/libpq/fe-secure-nss.c
@@ -0,0 +1,960 @@
+/*-------------------------------------------------------------------------
+ *
+ * fe-secure-nss.c
+ *	  functions for supporting NSS as a TLS backend for frontend libpq
+ *
+
+ * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ *	  src/interfaces/libpq/fe-secure-nss.c
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#include "postgres_fe.h"
+
+#include "libpq-fe.h"
+#include "fe-auth.h"
+#include "libpq-int.h"
+
+/*
+ * BITS_PER_BYTE is also defined in the NSPR header fils, so we need to undef
+ * our version to avoid compiler warnings on redefinition.
+ */
+#define pg_BITS_PER_BYTE BITS_PER_BYTE
+#undef BITS_PER_BYTE
+
+/*
+ * The nspr/obsolete/protypes.h NSPR header typedefs uint64 and int64 with
+ * colliding definitions from ours, causing a much expected compiler error.
+ * The definitions are however not actually used in NSPR at all, and are only
+ * intended for what seems to be backwards compatibility for apps written
+ * against old versions of NSPR.  The following comment is in the referenced
+ * file, and was added in 1998:
+ *
+ *		This section typedefs the old 'native' types to the new PR<type>s.
+ *		These definitions are scheduled to be eliminated at the earliest
+ *		possible time. The NSPR API is implemented and documented using
+ *		the new definitions.
+ *
+ * As there is no opt-out from pulling in these typedefs, we define the guard
+ * for the file to exclude it. This is incredibly ugly, but seems to be about
+ * the only way around it.
+ */
+#define PROTYPES_H
+#include <nspr.h>
+#undef PROTYPES_H
+#include <nss.h>
+#include <ssl.h>
+#include <sslproto.h>
+#include <pk11func.h>
+#include <prerror.h>
+#include <prinit.h>
+#include <prio.h>
+#include <secerr.h>
+#include <secmod.h>
+
+/*
+ * Ensure that the colliding definitions match, else throw an error. In case
+ * NSPR remove the definition in a future version (however unlikely that may
+ * be, make sure to put ours back again.
+ */
+#if defined(BITS_PER_BYTE)
+#  if BITS_PER_BYTE != pg_BITS_PER_BYTE
+#    error "incompatible byte widths between NSPR and PostgreSQL"
+#  endif
+#else
+#  define BITS_PER_BYTE pg_BITS_PER_BYTE
+#endif
+#undef pg_BITS_PER_BYTE
+
+static SECStatus pg_load_nss_module(SECMODModule **module, const char *library, const char *name);
+static SECStatus pg_bad_cert_handler(void *arg, PRFileDesc *fd);
+static char *pg_SSLerrmessage(PRErrorCode errcode);
+static SECStatus pg_client_auth_handler(void *arg, PRFileDesc *socket, CERTDistNames *caNames,
+					   CERTCertificate **pRetCert, SECKEYPrivateKey **pRetKey);
+static SECStatus pg_cert_auth_handler(void *arg, PRFileDesc *fd, PRBool checksig, PRBool isServer);
+static int ssl_protocol_version_to_nss(const char *protocol);
+static bool cert_database_has_CA(PGconn *conn);
+
+static char *PQssl_passwd_cb(PK11SlotInfo *slot, PRBool retry, void *arg);
+
+/*
+ * PR_ImportTCPSocket() is a private API, but very widely used, as it's the
+ * only way to make NSS use an already set up POSIX file descriptor rather
+ * than opening one itself. To quote the NSS documentation:
+ *
+ *		"In theory, code that uses PR_ImportTCPSocket may break when NSPR's
+ *		implementation changes. In practice, this is unlikely to happen because
+ *		NSPR's implementation has been stable for years and because of NSPR's
+ *		strong commitment to backward compatibility."
+ *
+ * https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSPR/Reference/PR_ImportTCPSocket
+ *
+ * The function is declared in <private/pprio.h>, but as it is a header marked
+ * private we declare it here rather than including it.
+ */
+NSPR_API(PRFileDesc*) PR_ImportTCPSocket(int);
+
+static SECMODModule *ca_trust = NULL;
+static NSSInitContext *nss_context = NULL;
+
+/*
+ * Track whether the NSS database has a password set or not. There is no API
+ * function for retrieving password status, so we simply flip this to true in
+ * case NSS invoked the password callback - as that will only happen in case
+ * there is a password. The reason for tracking this is that there are calls
+ * which require a password parameter, but doesn't use the callbacks provided,
+ * so we must call the callback on behalf of these.
+ */
+static bool has_password = false;
+
+#if defined(WIN32)
+static const char *ca_trust_name = "nssckbi.dll";
+#elif defined(__darwin__)
+static const char *ca_trust_name = "libnssckbi.dylib";
+#else
+static const char *ca_trust_name = "libnssckbi.so";
+#endif
+
+static PQsslKeyPassHook_type_nss PQsslKeyPassHook = NULL;
+
+/* ------------------------------------------------------------ */
+/*			 Procedures common to all secure sessions			*/
+/* ------------------------------------------------------------ */
+
+void
+pgtls_init_library(bool do_ssl, int do_crypto)
+{
+	/* TODO: implement me .. */
+}
+
+int
+pgtls_init(PGconn *conn)
+{
+	conn->ssl_in_use = false;
+
+	return 0;
+}
+
+void
+pgtls_close(PGconn *conn)
+{
+	if (nss_context)
+	{
+		NSS_ShutdownContext(nss_context);
+		nss_context = NULL;
+	}
+}
+
+PostgresPollingStatusType
+pgtls_open_client(PGconn *conn)
+{
+	SECStatus				status;
+	PRFileDesc			   *pr_fd;
+	PRFileDesc			   *model;
+	NSSInitParameters		params;
+	SSLVersionRange			desired_range;
+
+	/*
+	 * The NSPR documentation states that runtime initialization via PR_Init is
+	 * no longer required, as the first caller into NSPR will perform the
+	 * initialization implicitly. The documentation doesn't however clarify
+	 * from which version this is holds true, so let's perform the potentially
+	 * superfluous initialization anyways to avoid crashing on older versions
+	 * of NSPR, as there is no difference in overhead.  The NSS documentation
+	 * still states that PR_Init must be called in some way (implicitly or
+	 * explicitly).
+	 *
+	 * The below parameters are what the implicit initialization would've done
+	 * for us, and should work even for older versions where it might not be
+	 * done automatically. The last parameter, maxPTDs, is set to various
+	 * values in other codebases, but has been unused since NSPR 2.1 which was
+	 * released sometime in 1998.
+	 */
+	PR_Init(PR_USER_THREAD, PR_PRIORITY_NORMAL, 0);
+
+	/*
+	 * The original design of NSS was for a single application to use a single
+	 * copy of it, initialized with NSS_Initialize() which isn't returning any
+	 * handle with which to refer to NSS. NSS initialization and shutdown are
+	 * global for the application, so a shutdown in another NSS enabled library
+	 * would cause NSS to be stopped for libpq as well.  The fix has been to
+	 * introduce NSS_InitContext which returns a context handle to pass to
+	 * NSS_ShutdownContext.  NSS_InitContext was introduced in NSS 3.12, but
+	 * the use of it is not very well documented.
+	 * https://bugzilla.redhat.com/show_bug.cgi?id=738456
+	 *
+	 * The InitParameters struct passed can be used to override internal values
+	 * in NSS, but the usage is not documented at all. When using NSS_Init
+	 * initializations, the values are instead set via PK11_Configure calls so
+	 * the PK11_Configure documentation can be used to glean some details on
+	 * these.
+	 *
+	 * https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS/PKCS11/Module_Specs
+	 */
+	memset(&params, 0, sizeof(params));
+	params.length = sizeof(params);
+
+	if (conn->cert_database && strlen(conn->cert_database) > 0)
+	{
+		char *cert_database_path = psprintf("sql:%s", conn->cert_database);
+
+		nss_context = NSS_InitContext(cert_database_path, "", "", "",
+									  &params,
+									  NSS_INIT_READONLY | NSS_INIT_PK11RELOAD);
+		pfree(cert_database_path);
+	}
+	else
+		nss_context = NSS_InitContext("", "", "", "", &params,
+									  NSS_INIT_READONLY | NSS_INIT_NOCERTDB |
+									  NSS_INIT_NOMODDB | NSS_INIT_FORCEOPEN |
+									  NSS_INIT_NOROOTINIT | NSS_INIT_PK11RELOAD);
+
+	if (!nss_context)
+	{
+		char		*err = pg_SSLerrmessage(PR_GetError());
+
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to %s certificate database: %s"),
+						  				conn->cert_database ? "open" : "create",
+										err);
+		free(err);
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * Configure cipher policy.
+	 */
+	status = NSS_SetDomesticPolicy();
+	if (status != SECSuccess)
+	{
+		char		*err = pg_SSLerrmessage(PR_GetError());
+
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to configure cipher policy: %s"),
+						  				err);
+		free(err);
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * If we don't have a certificate database, the system trust store is the
+	 * fallback we can use. If we fail to initialize that as well, we can still
+	 * attempt a connection as long as the sslmode isn't verify*.
+	 */
+	if (!conn->cert_database && conn->sslmode[0] == 'v')
+	{
+		status = pg_load_nss_module(&ca_trust, ca_trust_name, "\"Root Certificates\"");
+		//status = pg_load_nss_module(&ca_trust, ca_trust_name, "trust");
+		if (status != SECSuccess)
+		{
+			char *err = pg_SSLerrmessage(PR_GetError());
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("WARNING: unable to load NSS trust module \"%s\" : %s"), ca_trust_name, err);
+			return PGRES_POLLING_FAILED;
+		}
+	}
+
+
+	PK11_SetPasswordFunc(PQssl_passwd_cb);
+
+	/*
+	 * Import the already opened socket as we don't want to use NSPR functions
+	 * for opening the network socket due to how the PostgreSQL protocol works
+	 * with TLS connections. This function is not part of the NSPR public API,
+	 * see the comment at the top of the file for the rationale of still using
+	 * it.
+	 */
+	pr_fd = PR_ImportTCPSocket(conn->sock);
+	if (!pr_fd)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to attach to socket: %s"),
+						  				pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * Most of the documentation available, and implementations of, NSS/NSPR
+	 * use the PR_NewTCPSocket() function here, which has the drawback that it
+	 * can only create IPv4 sockets. Instead use PR_OpenTCPSocket() which copes
+	 * with IPv6 as well.
+	 */
+	model = SSL_ImportFD(NULL, PR_OpenTCPSocket(conn->laddr.addr.ss_family));
+	if (!model)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to enable TLS: %s"),
+						  				pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/* Disable old protocol versions (SSLv2 and SSLv3) */
+	SSL_OptionSet(model, SSL_ENABLE_SSL2, PR_FALSE);
+	SSL_OptionSet(model, SSL_V2_COMPATIBLE_HELLO, PR_FALSE);
+	SSL_OptionSet(model, SSL_ENABLE_SSL3, PR_FALSE);
+
+#ifdef SSL_CBC_RANDOM_IV
+	/*
+	 * Enable protection against the BEAST attack in case the NSS library has
+	 * support for that. While SSLv3 is disabled, we may still allow TLSv1
+	 * which is affected. The option isn't documented as an SSL option, but as
+	 * an NSS environment variable.
+	 */
+	SSL_OptionSet(model, SSL_CBC_RANDOM_IV, PR_TRUE);
+#endif
+
+	/* Set us up as a TLS client for the handshake */
+	SSL_OptionSet(model, SSL_HANDSHAKE_AS_CLIENT, PR_TRUE);
+
+	/*
+	 * When setting the available protocols, we either use the user defined
+	 * configuration values, and if missing we accept whatever is the highest
+	 * version supported by the library as the max and only limit the range in
+	 * the other end at TLSv1.0. ssl_variant_stream is a ProtocolVariant enum
+	 * for Stream protocols, rather than datagram.
+	 */
+	SSL_VersionRangeGetSupported(ssl_variant_stream, &desired_range);
+	desired_range.min = SSL_LIBRARY_VERSION_TLS_1_0;
+
+	if (conn->ssl_min_protocol_version && strlen(conn->ssl_min_protocol_version) > 0)
+	{
+		int ssl_min_ver = ssl_protocol_version_to_nss(conn->ssl_min_protocol_version);
+
+		if (ssl_min_ver == -1)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("invalid value \"%s\" for minimum version of SSL protocol\n"),
+							  conn->ssl_min_protocol_version);
+			return -1;
+		}
+
+		desired_range.min = ssl_min_ver;
+	}
+
+	if (conn->ssl_max_protocol_version && strlen(conn->ssl_max_protocol_version) > 0)
+	{
+		int ssl_max_ver = ssl_protocol_version_to_nss(conn->ssl_max_protocol_version);
+
+		if (ssl_max_ver == -1)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("invalid value \"%s\" for maximum version of SSL protocol\n"),
+							  conn->ssl_max_protocol_version);
+			return -1;
+		}
+
+		desired_range.max = ssl_max_ver;
+	}
+
+	if (SSL_VersionRangeSet(model, &desired_range) != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to set allowed SSL protocol version range: %s"),
+						  				pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * Set up callback for verifying server certificates, as well as for how
+	 * to handle failed verifications.
+	 */
+	SSL_AuthCertificateHook(model, pg_cert_auth_handler, (void *) conn);
+	SSL_BadCertHook(model, pg_bad_cert_handler, (void *) conn);
+
+	/*
+	 * Convert the NSPR socket to an SSL socket. Ensuring the success of this
+	 * operation is critical as NSS SSL_* functions may return SECSuccess on
+	 * the socket even though SSL hasn't been enabled, which introduce a risk
+	 * of silent downgrades.
+	 */
+	conn->pr_fd = SSL_ImportFD(model, pr_fd);
+	if (!conn->pr_fd)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to configure client for TLS: %s"),
+						  				pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * The model can now we closed as we've applied the settings of the model
+	 * onto the real socket. From hereon we should only use conn->pr_fd.
+	 */
+	PR_Close(model);
+
+	/* Set the private data to be passed to the password callback */
+	SSL_SetPKCS11PinArg(conn->pr_fd, (void *) conn);
+
+	/*
+	 * If a CRL file has been specified, verify if it exists in the database
+	 * but don't fail in case it doesn't.
+	 */
+	if (conn->sslcrl && strlen(conn->sslcrl) > 0)
+	{
+		/* XXX: Implement me.. */
+	}
+
+	status = SSL_ResetHandshake(conn->pr_fd, PR_FALSE);
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to initiate handshake: %s"),
+						  				pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * Set callback for client authentication when requested by the server.
+	 */
+	SSL_GetClientAuthDataHook(conn->pr_fd, pg_client_auth_handler, (void *) conn);
+
+	/*
+	 * Specify which hostname we are expecting to talk to. This is required,
+	 * albeit mostly applies to when opening a connection to a traditional
+	 * http server it seems.
+	 */
+	SSL_SetURL(conn->pr_fd, (conn->connhost[conn->whichhost]).host);
+
+	do
+	{
+		status = SSL_ForceHandshake(conn->pr_fd);
+	}
+	while (status != SECSuccess && PR_GetError() == PR_WOULD_BLOCK_ERROR);
+
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("SSL error: %s"),
+						  				pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	conn->ssl_in_use = true;
+	return PGRES_POLLING_OK;
+}
+
+ssize_t
+pgtls_read(PGconn *conn, void *ptr, size_t len)
+{
+	PRInt32			nread;
+	PRErrorCode		status;
+	int				read_errno = 0;
+
+	nread = PR_Recv(conn->pr_fd, ptr, len, 0, PR_INTERVAL_NO_WAIT);
+
+	/*
+	 * PR_Recv blocks until there is data to read or the timeout expires. Zero
+	 * is returned for closed connections, while -1 indicates an error within
+	 * the ongoing connection.
+	 */
+	if (nread == 0)
+	{
+		read_errno = ECONNRESET;
+		return -1;
+	}
+
+	if (nread == -1)
+	{
+		status = PR_GetError();
+
+		switch(status)
+		{
+			case PR_WOULD_BLOCK_ERROR:
+				read_errno = EINTR;
+				break;
+
+			case PR_IO_TIMEOUT_ERROR:
+				break;
+			/*
+			 * The error cases for PR_Recv are not documented, but can be
+			 * reverse engineered from _MD_unix_map_default_error() in the
+			 * NSPR code, defined in pr/src/md/unix/unix_errors.c.
+			 */
+			default:
+				printfPQExpBuffer(&conn->errorMessage,
+								  libpq_gettext("TLS read error: %s"),
+								  				pg_SSLerrmessage(status));
+				break;
+		}
+	}
+
+	SOCK_ERRNO_SET(read_errno);
+	return (ssize_t) nread;
+}
+
+/*
+ * pgtls_read_pending
+ *		Check for the existence of data to be read.
+ *
+ * This is part of the PostgreSQL TLS backend API.
+ */
+bool
+pgtls_read_pending(PGconn *conn)
+{
+	unsigned char	c;
+	int				n;
+
+	/*
+	 * PR_Recv peeks into the stream with the timeount turned off, to see if
+	 * there is another byte to read off the wire. There is an NSS function
+	 * SSL_DataPending() which might seem like a better fit, but it will only
+	 * check already encrypted data in the SSL buffer, not still unencrypted
+	 * data, thus it doesn't guarantee that a subsequent call to
+	 * PR_Read/PR_Recv wont block.
+	 */
+	n = PR_Recv(conn->pr_fd, &c, 1, PR_MSG_PEEK, PR_INTERVAL_NO_WAIT);
+	return (n > 0);
+}
+
+ssize_t
+pgtls_write(PGconn *conn, const void *ptr, size_t len)
+{
+	PRInt32			n;
+	PRErrorCode		status;
+	int				write_errno = 0;
+
+	n = PR_Write(conn->pr_fd, ptr, len);
+
+	if (n < 0)
+	{
+		status = PR_GetError();
+
+		switch(status)
+		{
+			case PR_WOULD_BLOCK_ERROR:
+#ifdef EAGAIN
+				write_errno = EAGAIN;
+#else
+				write_errno = EINTR;
+#endif
+				break;
+
+			default:
+				printfPQExpBuffer(&conn->errorMessage,
+								  libpq_gettext("TLS write error: %s"),
+												pg_SSLerrmessage(status));
+				write_errno = ECONNRESET;
+				break;
+		}
+	}
+
+	SOCK_ERRNO_SET(write_errno);
+	return (ssize_t) n;
+}
+
+/* ------------------------------------------------------------ */
+/*			PostgreSQL specific TLS support functions			*/
+/* ------------------------------------------------------------ */
+
+/*
+ * TODO: this a 99% copy of the same function in the backend, make these share
+ * a single implementation instead.
+ */
+static char *
+pg_SSLerrmessage(PRErrorCode errcode)
+{
+	const char *error;
+
+	error = PR_ErrorToName(errcode);
+	if (error)
+		return strdup(error);
+
+	return strdup("unknown TLS error");
+}
+
+static SECStatus
+pg_load_nss_module(SECMODModule **module, const char *library, const char *name)
+{
+	SECMODModule   *mod;
+	char		   *modulespec;
+
+	modulespec = psprintf("library=\"%s\", name=\"%s\"", library, name);
+
+	/*
+	 * Attempt to load the specified module. The second parameter is "parent"
+	 * which should always be NULL for application code. The third parameter
+	 * defines if loading should recurse which is only applicable when loading
+	 * a module from within another module. This hierarchy would have to be
+	 * defined in the modulespec, and since we don't support anything but
+	 * directly addressed modules we should pass PR_FALSE.
+	 */
+	mod = SECMOD_LoadUserModule(modulespec, NULL, PR_FALSE);
+	pfree(modulespec);
+
+	if (mod && mod->loaded)
+	{
+		*module = mod;
+		return SECSuccess;
+	}
+
+	SECMOD_DestroyModule(mod);
+	return SECFailure;
+}
+
+/* ------------------------------------------------------------ */
+/*						NSS Callbacks							*/
+/* ------------------------------------------------------------ */
+
+/*
+ * pg_cert_auth_handler
+ *			Callback for authenticating server certificate
+ *
+ * This is pretty much the same procedure as the SSL_AuthCertificate function
+ * provided by NSS, with the difference being server hostname validation. With
+ * SSL_AuthCertificate there is no way to do verify-ca, it only does the -full
+ * flavor of our sslmodes, so we need our own implementation.
+ */
+static SECStatus
+pg_cert_auth_handler(void *arg, PRFileDesc *fd, PRBool checksig, PRBool isServer)
+{
+	SECStatus			status;
+	PGconn			   *conn = (PGconn *) arg;
+	char			   *server_hostname = NULL;
+	CERTCertificate	   *server_cert;
+	void			   *pin;
+
+	Assert(!isServer);
+
+	pin = SSL_RevealPinArg(conn->pr_fd);
+	server_cert = SSL_PeerCertificate(conn->pr_fd);
+
+	status = CERT_VerifyCertificateNow((CERTCertDBHandle *) CERT_GetDefaultCertDB(), server_cert,
+									   checksig, certificateUsageSSLServer,
+									   pin, NULL);
+
+	/*
+	 * If we've already failed validation then there is no point in also
+	 * performing the hostname check for verify-full.
+	 */
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to verify certificate: %s"),
+						  				pg_SSLerrmessage(PR_GetError()));
+		goto done;
+	}
+
+	if (strcmp(conn->sslmode, "verify-full") == 0)
+	{
+		server_hostname = SSL_RevealURL(conn->pr_fd);
+		if (!server_hostname || server_hostname[0] == '\0')
+			goto done;
+
+		/*
+		 * CERT_VerifyCertName will internally perform RFC 2818 SubjectAltName
+		 * verification.
+		 */
+		status = CERT_VerifyCertName(server_cert, server_hostname);
+		if (status != SECSuccess)
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("unable to verify server hostname: %s"),
+							  				pg_SSLerrmessage(PR_GetError()));
+
+	}
+
+done:
+	if (server_hostname)
+		PR_Free(server_hostname);
+
+	CERT_DestroyCertificate(server_cert);
+	return status;
+}
+
+/*
+ * pg_client_auth_handler
+ *		Callback for client certificate validation
+ *
+ * The client auth callback is not on by default in NSS, so we need to invoke
+ * it ourselves to ensure we can do cert authentication. A TODO is to support
+ * running without a specified sslcert parameter. By retrieving all the certs
+ * via nickname from the cert database and see if we find one which apply with
+ * NSS_CmpCertChainWCANames() and PK11_FindKeyByAnyCert() we could support
+ * just running with a ssl database specified.
+ *
+ * For now, we use the default client certificate validation which requires a
+ * defined nickname to identify the cert in the database.
+ */
+static SECStatus
+pg_client_auth_handler(void *arg, PRFileDesc *socket, CERTDistNames *caNames,
+					   CERTCertificate **pRetCert, SECKEYPrivateKey **pRetKey)
+{
+	PGconn		   *conn = (PGconn *) arg;
+
+	return NSS_GetClientAuthData(conn->sslcert, socket, caNames, pRetCert, pRetKey);
+}
+
+/*
+ * pg_bad_cert_handler
+ *		Callback for failed certificate validation
+ *
+ * The TLS handshake will call this function iff the server certificate failed
+ * validation. Depending on the sslmode, we allow the connection anyways.
+ */
+static SECStatus
+pg_bad_cert_handler(void *arg, PRFileDesc *fd)
+{
+	PGconn		   *conn = (PGconn *) arg;
+	PRErrorCode		err;
+
+	/*
+	 * This really shouldn't happen, as we've the the PGconn object as our
+	 * callback data, and at the callsite we know it will be populated. That
+	 * being said, the NSS code itself performs this check even when it should
+	 * not be required so let's use the same belts with our suspenders.
+	 */
+	if (!arg)
+		return SECFailure;
+
+	/*
+	 * For sslmodes other than verify-full and verify-ca we don't perform peer
+	 * validation, so return immediately.  sslmode require with a database
+	 * specified which contains a CA certificate will work like verify-ca to be
+	 * compatible with the OpenSSL implementation.
+	 */
+	if (strcmp(conn->sslmode, "require") == 0)
+	{ 
+		if (conn->cert_database && strlen(conn->cert_database) > 0 && cert_database_has_CA(conn))
+			return SECFailure;
+	}
+	if (conn->sslmode[0] == 'v')
+		return SECFailure;
+
+	err = PORT_GetError();
+
+	/*
+	 * TODO: these are relevant error codes that can occur in certificate
+	 * validation, figure out which we dont want for require/prefer etc.
+	 */
+    switch (err)
+	{
+        case SEC_ERROR_INVALID_AVA:
+        case SEC_ERROR_INVALID_TIME:
+        case SEC_ERROR_BAD_SIGNATURE:
+        case SEC_ERROR_EXPIRED_CERTIFICATE:
+        case SEC_ERROR_UNKNOWN_ISSUER:
+		case SEC_ERROR_UNTRUSTED_ISSUER:
+        case SEC_ERROR_UNTRUSTED_CERT:
+        case SEC_ERROR_CERT_VALID:
+        case SEC_ERROR_EXPIRED_ISSUER_CERTIFICATE:
+        case SEC_ERROR_CRL_EXPIRED:
+        case SEC_ERROR_CRL_BAD_SIGNATURE:
+        case SEC_ERROR_EXTENSION_VALUE_INVALID:
+        case SEC_ERROR_CA_CERT_INVALID:
+        case SEC_ERROR_CERT_USAGES_INVALID:
+        case SEC_ERROR_UNKNOWN_CRITICAL_EXTENSION:
+            return SECSuccess;
+            break;
+        default:
+            return SECFailure;
+            break;
+	}
+
+	/* Unreachable */
+	return SECSuccess;
+}
+
+/* ------------------------------------------------------------ */
+/*					SSL information functions					*/
+/* ------------------------------------------------------------ */
+
+void *
+PQgetssl(PGconn *conn)
+{
+	/*
+	 * Always return NULL as this is legacy and defined to be equal to
+	 * PQsslStruct(conn, "OpenSSL"); This should ideally trigger a logged
+	 * warning somewhere as it's nonsensical to run in a non-OpenSSL build,
+	 * but the color of said bikeshed hasn't yet been determined.
+	 */
+	return NULL;
+}
+
+void *
+PQsslStruct(PGconn *conn, const char *struct_name)
+{
+	if (!conn)
+		return NULL;
+
+	/*
+	 * Return the underlying PRFileDesc which can be used to access information
+	 * on the connection details. There is no SSL context per se.
+	 */
+	if (strcmp(struct_name, "NSS") == 0)
+		return conn->pr_fd;
+	return NULL;
+}
+
+const char *const *
+PQsslAttributeNames(PGconn *conn)
+{
+	static const char *const result[] = {
+		"library",
+		"cipher",
+		"protocol",
+		"key_bits",
+		"compression",
+		NULL
+	};
+
+	return result;
+}
+
+const char *
+PQsslAttribute(PGconn *conn, const char *attribute_name)
+{
+	SECStatus			status;
+	SSLChannelInfo		channel;
+	SSLCipherSuiteInfo	suite;
+
+	if (!conn || !conn->pr_fd)
+		return NULL;
+
+	if (strcmp(attribute_name, "library") == 0)
+		return "NSS";
+
+	status = SSL_GetChannelInfo(conn->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+		return NULL;
+
+	status = SSL_GetCipherSuiteInfo(channel.cipherSuite, &suite, sizeof(suite));
+	if (status != SECSuccess)
+		return NULL;
+
+	if (strcmp(attribute_name, "cipher") == 0)
+		return suite.cipherSuiteName;
+
+	if (strcmp(attribute_name, "key_bits") == 0)
+	{
+		static char key_bits_str[8];
+
+		snprintf(key_bits_str, sizeof(key_bits_str), "%i", suite.effectiveKeyBits);
+		return key_bits_str;
+	}
+
+	if (strcmp(attribute_name, "protocol") == 0)
+	{
+		switch(channel.protocolVersion)
+		{
+#ifdef SSL_LIBRARY_VERSION_TLS_1_3
+			case SSL_LIBRARY_VERSION_TLS_1_3:
+				return "TLSv1.3";
+#endif
+#ifdef SSL_LIBRARY_VERSION_TLS_1_2
+			case SSL_LIBRARY_VERSION_TLS_1_2:
+				return "TLSv1.2";
+#endif
+#ifdef SSL_LIBRARY_VERSION_TLS_1_1
+			case SSL_LIBRARY_VERSION_TLS_1_1:
+				return "TLSv1.1";
+#endif
+			case SSL_LIBRARY_VERSION_TLS_1_0:
+				return "TLSv1.0";
+			default:
+				return "unknown";
+		}
+	}
+
+	/*
+	 * NSS disabled support for compression in version 3.33, and it was only
+	 * available for SSLv3 at that point anyways, so we can safely return off
+	 * here without checking.
+	 */
+	if (strcmp(attribute_name, "compression") == 0)
+		return "off";
+
+	return NULL;
+}
+
+static int
+ssl_protocol_version_to_nss(const char *protocol)
+{
+	if (pg_strcasecmp("TLSv1", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_0;
+
+#ifdef SSL_LIBRARY_VERSION_TLS_1_1
+	if (pg_strcasecmp("TLSv1.1", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_1;
+#endif
+
+#ifdef SSL_LIBRARY_VERSION_TLS_1_2
+	if (pg_strcasecmp("TLSv1.2", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_2;
+#endif
+
+#ifdef SSL_LIBRARY_VERSION_TLS_1_3
+	if (pg_strcasecmp("TLSv1.3", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_3;
+#endif
+
+	return -1;
+}
+
+static bool
+cert_database_has_CA(PGconn *conn)
+{
+	CERTCertList	   *certificates;
+	bool				hasCA;
+
+	/*
+	 * If the certificate database has a password we must provide it, since
+	 * this API doesn't invoke the standard password callback.
+	 */
+	if (has_password)
+		certificates = PK11_ListCerts(PK11CertListCA, PQssl_passwd_cb(NULL, PR_FALSE, (void *) conn));
+	else
+		certificates = PK11_ListCerts(PK11CertListCA, NULL);
+	hasCA = !CERT_LIST_EMPTY(certificates);
+	CERT_DestroyCertList(certificates);
+
+	return hasCA;
+}
+
+PQsslKeyPassHook_type_nss
+PQgetSSLKeyPassHook_nss(void)
+{
+	return PQsslKeyPassHook;
+}
+
+void
+PQsetSSLKeyPassHook_nss(PQsslKeyPassHook_type_nss hook)
+{
+	PQsslKeyPassHook = hook;
+}
+
+/*
+ * Supply a password to decrypt a client certificate.
+ *
+ * This must match NSS type PK11PasswordFunc.
+ */
+static char *
+PQssl_passwd_cb(PK11SlotInfo *slot, PRBool retry, void *arg)
+{
+	has_password = true;
+
+	if (PQsslKeyPassHook)
+		return PQsslKeyPassHook(slot, (PRBool) retry, arg);
+	else
+		return PQdefaultSSLKeyPassHook_nss(slot, retry, arg);
+}
+
+/*
+ * The default password handler callback.
+ */
+char *
+PQdefaultSSLKeyPassHook_nss(PK11SlotInfo *slot, PRBool retry, void *arg)
+{
+	PGconn *conn = (PGconn *) arg;
+
+	/*
+	 * If the password didn't work the first time there is no point in retrying
+	 * as it hasn't changed.
+	 */
+	if (retry != PR_TRUE && conn->sslpassword && strlen(conn->sslpassword) > 0)
+		return PORT_Strdup(conn->sslpassword);
+
+	return NULL;
+}
diff --git a/src/interfaces/libpq/libpq-fe.h b/src/interfaces/libpq/libpq-fe.h
index 3b6a9fbce3..1fc7e43cfd 100644
--- a/src/interfaces/libpq/libpq-fe.h
+++ b/src/interfaces/libpq/libpq-fe.h
@@ -625,6 +625,17 @@ extern PQsslKeyPassHook_OpenSSL_type PQgetSSLKeyPassHook_OpenSSL(void);
 extern void PQsetSSLKeyPassHook_OpenSSL(PQsslKeyPassHook_OpenSSL_type hook);
 extern int	PQdefaultSSLKeyPassHook_OpenSSL(char *buf, int size, PGconn *conn);
 
+/* == in fe-secure-nss.c === */
+typedef struct PK11SlotInfoStr PK11SlotInfo;
+typedef int PRIntn;
+typedef PRIntn PRBool;
+
+/* Support for overriding sslpassword handling with a callback. */
+typedef char *(*PQsslKeyPassHook_type_nss)(PK11SlotInfo *slot, PRBool retry, void *arg);
+extern PQsslKeyPassHook_type_nss PQgetSSLKeyPassHook_nss(void);
+extern void PQsetSSLKeyPassHook_nss(PQsslKeyPassHook_type_nss hook);
+extern char *PQdefaultSSLKeyPassHook_nss(PK11SlotInfo *slot, PRBool retry, void *arg);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/src/interfaces/libpq/libpq-int.h b/src/interfaces/libpq/libpq-int.h
index 1de91ae295..53602dc1a6 100644
--- a/src/interfaces/libpq/libpq-int.h
+++ b/src/interfaces/libpq/libpq-int.h
@@ -485,6 +485,11 @@ struct pg_conn
 								 * OpenSSL version changes */
 #endif
 #endif							/* USE_OPENSSL */
+
+#ifdef USE_NSS
+	char	   *cert_database;
+	void	   *pr_fd;
+#endif							/* USE_NSS */
 #endif							/* USE_SSL */
 
 #ifdef ENABLE_GSS
diff --git a/src/test/ssl/Makefile b/src/test/ssl/Makefile
index 777ee39413..bb54939ead 100644
--- a/src/test/ssl/Makefile
+++ b/src/test/ssl/Makefile
@@ -14,6 +14,7 @@ top_builddir = ../../..
 include $(top_builddir)/src/Makefile.global
 
 export with_openssl
+export with_nss
 
 CERTIFICATES := server_ca server-cn-and-alt-names \
 	server-cn-only server-single-alt-name server-multiple-alt-names \
@@ -30,6 +31,27 @@ SSLFILES := $(CERTIFICATES:%=ssl/%.key) $(CERTIFICATES:%=ssl/%.crt) \
 	ssl/client+client_ca.crt ssl/client-der.key \
 	ssl/client-encrypted-pem.key ssl/client-encrypted-der.key
 
+NSSFILES := ssl/nss/client_ca.crt.db \
+	ssl/nss/server_ca.crt.db \
+	ssl/nss/root+server_ca.crt.db \
+	ssl/nss/root+client_ca.crt.db \
+	ssl/nss/both-cas-1.crt.db \
+	ssl/nss/client.crt__client.key.db \
+	ssl/nss/client-revoked.crt__client-revoked.key.db \
+	ssl/nss/server-cn-only.crt__server-password.key.db \
+	ssl/nss/server-cn-only.crt__server-cn-only.key.db \
+	ssl/nss/root.crl.der \
+	ssl/nss/server.crl.der \
+	ssl/nss/client.crl.der \
+	ssl/nss/server-multiple-alt-names.crt__server-multiple-alt-names.key.db \
+	ssl/nss/server-single-alt-name.crt__server-single-alt-name.key.db \
+	ssl/nss/server-cn-and-alt-names.crt__server-cn-and-alt-names.key.db \
+	ssl/nss/server-no-names.crt__server-no-names.key.db \
+	ssl/nss/server-revoked.crt__server-revoked.key.db \
+	ssl/nss/root+client.crl.der \
+	ssl/nss/client+client_ca.crt__client.key.db \
+	ssl/nss/client.crt__client-encrypted-pem.key.db
+
 # This target re-generates all the key and certificate files. Usually we just
 # use the ones that are committed to the tree without rebuilding them.
 #
@@ -37,6 +59,9 @@ SSLFILES := $(CERTIFICATES:%=ssl/%.key) $(CERTIFICATES:%=ssl/%.crt) \
 #
 sslfiles: $(SSLFILES)
 
+# Generate NSS certificate databases corresponding to the OpenSSL certificates
+nssfiles: $(NSSFILES)
+
 # OpenSSL requires a directory to put all generated certificates in. We don't
 # use this for anything, but we need a location.
 ssl/new_certs_dir:
@@ -64,6 +89,11 @@ ssl/%_ca.crt: ssl/%_ca.key %_ca.config ssl/root_ca.crt ssl/new_certs_dir
 	rm ssl/temp_ca.crt ssl/temp_ca_signed.crt
 	echo "01" > ssl/$*_ca.srl
 
+ssl/nss/%_ca.crt.db: ssl/%_ca.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n $*_ca.crt -i ssl/$*_ca.crt -t "CT,C,C"
+
 # Server certificates, signed by server CA:
 ssl/server-%.crt: ssl/server-%.key ssl/server_ca.crt server-%.config
 	openssl req -new -key ssl/server-$*.key -out ssl/server-$*.csr -config server-$*.config
@@ -77,6 +107,74 @@ ssl/server-ss.crt: ssl/server-cn-only.key ssl/server-cn-only.crt server-cn-only.
 	openssl x509 -req -days 10000 -in ssl/server-ss.csr -signkey ssl/server-cn-only.key -out ssl/server-ss.crt  -extensions v3_req -extfile server-cn-only.config
 	rm ssl/server-ss.csr
 
+ssl/nss/server-cn-only.crt__server-password.key.db: ssl/server-cn-only.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n server-cn-only.crt__server-password.key -i ssl/server-cn-only.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-password.pfx -inkey ssl/server-password.key -in ssl/server-cn-only.crt -certfile ssl/server_ca.crt -passin 'pass:secret1' -passout pass:
+	pk12util -i ssl/nss/server-password.pfx -d $@ -W '' 
+
+ssl/nss/server-cn-only.crt__server-cn-only.key.db: ssl/server-cn-only.crt ssl/server-cn-only.key
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n server-cn-only.crt__server-cn-only.key -i ssl/server-cn-only.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-cn-only.pfx -inkey ssl/server-cn-only.key -in ssl/server-cn-only.crt -certfile ssl/server_ca.crt -passout pass:
+	pk12util -i ssl/nss/server-cn-only.pfx -d $@ -W '' 
+
+ssl/nss/server-multiple-alt-names.crt__server-multiple-alt-names.key.db: ssl/server-multiple-alt-names.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n server-multiple-alt-names.crt__server-multiple-alt-names.key -i ssl/server-multiple-alt-names.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-multiple-alt-names.pfx -inkey ssl/server-multiple-alt-names.key -in ssl/server-multiple-alt-names.crt -certfile ssl/server-multiple-alt-names.crt -passout pass:
+	pk12util -i ssl/nss/server-multiple-alt-names.pfx -d $@ -W '' 
+
+ssl/nss/server-single-alt-name.crt__server-single-alt-name.key.db: ssl/server-single-alt-name.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n server-single-alt-name.crt__server-single-alt-name.key -i ssl/server-single-alt-name.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-single-alt-name.pfx -inkey ssl/server-single-alt-name.key -in ssl/server-single-alt-name.crt -certfile ssl/server-single-alt-name.crt -passout pass:
+	pk12util -i ssl/nss/server-single-alt-name.pfx -d $@ -W '' 
+
+ssl/nss/server-cn-and-alt-names.crt__server-cn-and-alt-names.key.db: ssl/server-cn-and-alt-names.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n server-cn-and-alt-names.crt__server-cn-and-alt-names.key -i ssl/server-cn-and-alt-names.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-cn-and-alt-names.pfx -inkey ssl/server-cn-and-alt-names.key -in ssl/server-cn-and-alt-names.crt -certfile ssl/server-cn-and-alt-names.crt -passout pass:
+	pk12util -i ssl/nss/server-cn-and-alt-names.pfx -d $@ -W '' 
+
+ssl/nss/server-no-names.crt__server-no-names.key.db: ssl/server-no-names.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n server-no-names.crt__server-no-names.key -i ssl/server-no-names.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-no-names.pfx -inkey ssl/server-no-names.key -in ssl/server-no-names.crt -certfile ssl/server-no-names.crt -passout pass:
+	pk12util -i ssl/nss/server-no-names.pfx -d $@ -W '' 
+
+ssl/nss/server-revoked.crt__server-revoked.key.db: ssl/server-revoked.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n server-revoked.crt__server-revoked.key -i ssl/server-revoked.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-revoked.pfx -inkey ssl/server-revoked.key -in ssl/server-revoked.crt -certfile ssl/server-revoked.crt -passout pass:
+	pk12util -i ssl/nss/server-revoked.pfx -d $@ -W '' 
+
 # Password-protected version of server-cn-only.key
 ssl/server-password.key: ssl/server-cn-only.key
 	openssl rsa -aes256 -in $< -out $@ -passout 'pass:secret1'
@@ -88,6 +186,27 @@ ssl/client.crt: ssl/client.key ssl/client_ca.crt
 	openssl x509 -in ssl/temp.crt -out ssl/client.crt # to keep just the PEM cert
 	rm ssl/client.csr ssl/temp.crt
 
+# Client certificate, signed by client CA
+ssl/nss/client.crt__client.key.db: ssl/client.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n client.crt__client.key -i ssl/client.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client.pfx -inkey ssl/client.key -in ssl/client.crt -certfile ssl/client_ca.crt -passout pass:
+	pk12util -i ssl/nss/client.pfx -d $@ -W '' 
+
+# Client certificate with encrypted key, signed by client CA
+ssl/nss/client.crt__client-encrypted-pem.key.db: ssl/client.crt
+	$(MKDIR_P) $@
+	echo 'dUmmyP^#+' > $@.pass  
+	certutil -d "sql:$@" -N -f $@.pass
+	certutil -d "sql:$@" -A -f $@.pass -n client.crt__client-encrypted-pem.key -i ssl/client.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -f $@.pass -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -f $@.pass -n root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client-encrypted-pem.pfx -inkey ssl/client-encrypted-pem.key -in ssl/client.crt -certfile ssl/client_ca.crt -passin pass:'dUmmyP^#+' -passout pass:'dUmmyP^#+'
+	pk12util -i ssl/nss/client-encrypted-pem.pfx -d $@ -W 'dUmmyP^#+' -k $@.pass
+
 # Another client certificate, signed by the client CA. This one is revoked.
 ssl/client-revoked.crt: ssl/client-revoked.key ssl/client_ca.crt client.config
 	openssl req -new -key ssl/client-revoked.key -out ssl/client-revoked.csr -config client.config
@@ -95,6 +214,14 @@ ssl/client-revoked.crt: ssl/client-revoked.key ssl/client_ca.crt client.config
 	openssl x509 -in ssl/temp.crt -out ssl/client-revoked.crt # to keep just the PEM cert
 	rm ssl/client-revoked.csr ssl/temp.crt
 
+ssl/nss/client-revoked.crt__client-revoked.key.db: ssl/client-revoked.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n client-revoked.crt__client-revoked.key -i ssl/client-revoked.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client-revoked.pfx -inkey ssl/client-revoked.key -in ssl/client-revoked.crt -certfile ssl/client_ca.crt -passout pass:
+	pk12util -i ssl/nss/client-revoked.pfx -d $@ -W ''
+
 # Convert the key to DER, to test our behaviour there too
 ssl/client-der.key: ssl/client.key
 	openssl rsa -in ssl/client.key -outform DER -out ssl/client-der.key
@@ -112,6 +239,13 @@ ssl/client-encrypted-der.key: ssl/client.key
 ssl/both-cas-1.crt: ssl/root_ca.crt ssl/client_ca.crt ssl/server_ca.crt
 	cat $^ > $@
 
+ssl/nss/both-cas-1.crt.db: ssl/root_ca.crt ssl/client_ca.crt ssl/server_ca.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+
 # The same, but the certs are in different order
 ssl/both-cas-2.crt: ssl/root_ca.crt ssl/server_ca.crt ssl/client_ca.crt
 	cat $^ > $@
@@ -127,19 +261,41 @@ ssl/root+client_ca.crt: ssl/root_ca.crt ssl/client_ca.crt
 ssl/client+client_ca.crt: ssl/client.crt ssl/client_ca.crt
 	cat $^ > $@
 
+# Client certificate, signed by client CA
+ssl/nss/client+client_ca.crt__client.key.db: ssl/client+client_ca.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n client+client_ca.crt__client.key -i ssl/client+client_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client.crt__client.key -i ssl/client.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client.pfx -inkey ssl/client.key -in ssl/client.crt -certfile ssl/client_ca.crt -passout pass:
+	pk12util -i ssl/nss/client.pfx -d $@ -W '' 
+
 #### CRLs
 
 ssl/client.crl: ssl/client-revoked.crt
 	openssl ca -config cas.config -name client_ca -revoke ssl/client-revoked.crt
 	openssl ca -config cas.config -name client_ca -gencrl -out ssl/client.crl
 
+ssl/nss/client.crl.der: ssl/client.crl
+	openssl crl -in $^ -outform der -out $@
+
 ssl/server.crl: ssl/server-revoked.crt
 	openssl ca -config cas.config -name server_ca -revoke ssl/server-revoked.crt
 	openssl ca -config cas.config -name server_ca -gencrl -out ssl/server.crl
 
+ssl/nss/server.crl.der: ssl/server.crl
+	openssl crl -in $^ -outform der -out $@
+
 ssl/root.crl: ssl/root_ca.crt
 	openssl ca -config cas.config -name root_ca -gencrl -out ssl/root.crl
 
+ssl/nss/root.crl.der: ssl/root.crl
+	openssl crl -in $^ -outform der -out $@
+
+ssl/nss/root+client.crl.der: ssl/root+client.crl
+	openssl crl -in $^ -outform der -out $@
+
 # If a CRL is used, OpenSSL requires a CRL file for *all* the CAs in the
 # chain, even if some of them are empty.
 ssl/root+server.crl: ssl/root.crl ssl/server.crl
@@ -154,6 +310,7 @@ sslfiles-clean:
 clean distclean maintainer-clean:
 	rm -rf tmp_check
 	rm -rf ssl/*.old ssl/new_certs_dir ssl/client*_tmp.key
+	rm -rf ssl/nss
 
 # Doesn't depend on $(SSLFILES) because we don't rebuild them by default
 check:
diff --git a/src/test/ssl/t/001_ssltests.pl b/src/test/ssl/t/001_ssltests.pl
index a454bb0274..dbbe94a645 100644
--- a/src/test/ssl/t/001_ssltests.pl
+++ b/src/test/ssl/t/001_ssltests.pl
@@ -4,15 +4,22 @@ use PostgresNode;
 use TestLib;
 use Test::More;
 
-use File::Copy;
-
 use FindBin;
 use lib $FindBin::RealBin;
 
-use SSLServer;
+use SSL::Server;
+
+my $openssl;
+my $nss;
 
 if ($ENV{with_openssl} eq 'yes')
 {
+	$openssl = 1;
+	plan tests => 93;
+}
+elsif ($ENV{with_nss} eq 'yes')
+{
+	$nss = 1;
 	plan tests => 93;
 }
 else
@@ -32,30 +39,6 @@ my $SERVERHOSTCIDR = '127.0.0.1/32';
 # Allocation of base connection string shared among multiple tests.
 my $common_connstr;
 
-# The client's private key must not be world-readable, so take a copy
-# of the key stored in the code tree and update its permissions.
-#
-# This changes ssl/client.key to ssl/client_tmp.key etc for the rest
-# of the tests.
-my @keys = (
-	"client",     "client-revoked",
-	"client-der", "client-encrypted-pem",
-	"client-encrypted-der");
-foreach my $key (@keys)
-{
-	copy("ssl/${key}.key", "ssl/${key}_tmp.key")
-	  or die
-	  "couldn't copy ssl/${key}.key to ssl/${key}_tmp.key for permissions change: $!";
-	chmod 0600, "ssl/${key}_tmp.key"
-	  or die "failed to change permissions on ssl/${key}_tmp.key: $!";
-}
-
-# Also make a copy of that explicitly world-readable.  We can't
-# necessarily rely on the file in the source tree having those
-# permissions.
-copy("ssl/client.key", "ssl/client_wrongperms_tmp.key");
-chmod 0644, "ssl/client_wrongperms_tmp.key";
-
 #### Set up the server.
 
 note "setting up data directory";
@@ -70,32 +53,27 @@ $node->start;
 
 # Run this before we lock down access below.
 my $result = $node->safe_psql('postgres', "SHOW ssl_library");
-is($result, 'OpenSSL', 'ssl_library parameter');
+is($result, SSL::Server::ssl_library(), 'ssl_library parameter');
 
 configure_test_server_for_ssl($node, $SERVERHOSTADDR, $SERVERHOSTCIDR,
 	'trust');
 
 note "testing password-protected keys";
 
-open my $sslconf, '>', $node->data_dir . "/sslconfig.conf";
-print $sslconf "ssl=on\n";
-print $sslconf "ssl_cert_file='server-cn-only.crt'\n";
-print $sslconf "ssl_key_file='server-password.key'\n";
-print $sslconf "ssl_passphrase_command='echo wrongpassword'\n";
-close $sslconf;
-
-command_fails(
-	[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
-	'restart fails with password-protected key file with wrong password');
-$node->_update_pid(0);
-
-open $sslconf, '>', $node->data_dir . "/sslconfig.conf";
-print $sslconf "ssl=on\n";
-print $sslconf "ssl_cert_file='server-cn-only.crt'\n";
-print $sslconf "ssl_key_file='server-password.key'\n";
-print $sslconf "ssl_passphrase_command='echo secret1'\n";
-close $sslconf;
+SKIP:
+{
+	skip "Certificate passphrases aren't checked on server restart in NSS", 1 if ($nss);
+
+	switch_server_cert($node, 'server-cn-only', 'root+client_ca', 'server-password',
+		'echo wrongpassword');
+	command_fails(
+		[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
+		'restart fails with password-protected key file with wrong password');
+	$node->_update_pid(0);
+}
 
+switch_server_cert($node, 'server-cn-only', 'root+client_ca', 'server-password',
+	'echo=secret1');
 command_ok(
 	[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
 	'restart succeeds with password-protected key file');
@@ -147,44 +125,44 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"sslrootcert=invalid sslmode=verify-ca",
-	qr/root certificate file "invalid" does not exist/,
+	qr/root certificate file "invalid" does not exist|could not connect to server/,
 	"connect without server root cert sslmode=verify-ca");
 test_connect_fails(
 	$common_connstr,
 	"sslrootcert=invalid sslmode=verify-full",
-	qr/root certificate file "invalid" does not exist/,
+	qr/root certificate file "invalid" does not exist|could not connect to server/,
 	"connect without server root cert sslmode=verify-full");
 
 # Try with wrong root cert, should fail. (We're using the client CA as the
 # root, but the server's key is signed by the server CA.)
 test_connect_fails($common_connstr,
-	"sslrootcert=ssl/client_ca.crt sslmode=require",
+	"sslrootcert=ssl/client_ca.crt sslmode=require cert_database=ssl/nss/client_ca.crt.db",
 	qr/SSL error/, "connect with wrong server root cert sslmode=require");
 test_connect_fails($common_connstr,
-	"sslrootcert=ssl/client_ca.crt sslmode=verify-ca",
+	"sslrootcert=ssl/client_ca.crt sslmode=verify-ca cert_database=ssl/nss/client_ca.crt.db",
 	qr/SSL error/, "connect with wrong server root cert sslmode=verify-ca");
 test_connect_fails($common_connstr,
-	"sslrootcert=ssl/client_ca.crt sslmode=verify-full",
+	"sslrootcert=ssl/client_ca.crt sslmode=verify-full cert_database=ssl/nss/client_ca.crt.db",
 	qr/SSL error/, "connect with wrong server root cert sslmode=verify-full");
 
 # Try with just the server CA's cert. This fails because the root file
 # must contain the whole chain up to the root CA.
 test_connect_fails($common_connstr,
-	"sslrootcert=ssl/server_ca.crt sslmode=verify-ca",
+	"sslrootcert=ssl/server_ca.crt sslmode=verify-ca cert_database=ssl/nss/server_ca.crt.db",
 	qr/SSL error/, "connect with server CA cert, without root CA");
 
 # And finally, with the correct root cert.
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require cert_database=ssl/nss/root+server_ca.crt.db",
 	"connect with correct server CA cert file sslmode=require");
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca cert_database=ssl/nss/root+server_ca.crt.db",
 	"connect with correct server CA cert file sslmode=verify-ca");
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-full",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db",
 	"connect with correct server CA cert file sslmode=verify-full");
 
 # Test with cert root file that contains two certificates. The client should
@@ -193,36 +171,42 @@ test_connect_ok(
 	$common_connstr,
 	"sslrootcert=ssl/both-cas-1.crt sslmode=verify-ca",
 	"cert root file that contains two certificates, order 1");
-test_connect_ok(
-	$common_connstr,
-	"sslrootcert=ssl/both-cas-2.crt sslmode=verify-ca",
-	"cert root file that contains two certificates, order 2");
 
+# How about import the both-file into a database?
+SKIP:
+{
+	skip "CA ordering is irrelevant in NSS databases ", 1 if ($nss);
+
+	test_connect_ok(
+		$common_connstr,
+		"sslrootcert=ssl/both-cas-2.crt sslmode=verify-ca",
+		"cert root file that contains two certificates, order 2");
+}
 # CRL tests
 
 # Invalid CRL filename is the same as no CRL, succeeds
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=invalid",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=invalid cert_database=ssl/nss/root+server_ca.crt.db",
 	"sslcrl option with invalid file name");
 
 # A CRL belonging to a different CA is not accepted, fails
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/client.crl",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/client.crl.der cert_database=ssl/nss/root+server_ca.crt.db",
 	qr/SSL error/,
 	"CRL belonging to a different CA");
 
 # With the correct CRL, succeeds (this cert is not revoked)
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/root+server.crl",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/root+server.crl.der cert_database=ssl/nss/root+server_ca.crt.db",
 	"CRL with a non-revoked cert");
 
 # Check that connecting with verify-full fails, when the hostname doesn't
 # match the hostname in the server's certificate.
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -235,14 +219,14 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"sslmode=verify-full host=wronghost.test",
-	qr/\Qserver certificate for "common-name.pg-ssltest.test" does not match host name "wronghost.test"\E/,
+	qr/SSL_ERROR_BAD_CERT_DOMAIN/,
 	"mismatch between host name and server certificate sslmode=verify-full");
 
 # Test Subject Alternative Names.
 switch_server_cert($node, 'server-multiple-alt-names');
 
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -260,12 +244,12 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"host=wronghost.alt-name.pg-ssltest.test",
-	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "wronghost.alt-name.pg-ssltest.test"\E/,
+	qr/SSL_ERROR_BAD_CERT_DOMAIN/,
 	"host name not matching with X.509 Subject Alternative Names");
 test_connect_fails(
 	$common_connstr,
 	"host=deep.subdomain.wildcard.pg-ssltest.test",
-	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E/,
+	qr/SSL_ERROR_BAD_CERT_DOMAIN/,
 	"host name not matching with X.509 Subject Alternative Names wildcard");
 
 # Test certificate with a single Subject Alternative Name. (this gives a
@@ -273,7 +257,7 @@ test_connect_fails(
 switch_server_cert($node, 'server-single-alt-name');
 
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -283,12 +267,12 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"host=wronghost.alt-name.pg-ssltest.test",
-	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "wronghost.alt-name.pg-ssltest.test"\E/,
+	qr/SSL_ERROR_BAD_CERT_DOMAIN/,
 	"host name not matching with a single X.509 Subject Alternative Name");
 test_connect_fails(
 	$common_connstr,
 	"host=deep.subdomain.wildcard.pg-ssltest.test",
-	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E/,
+	qr/SSL_ERROR_BAD_CERT_DOMAIN/,
 	"host name not matching with a single X.509 Subject Alternative Name wildcard"
 );
 
@@ -297,7 +281,7 @@ test_connect_fails(
 switch_server_cert($node, 'server-cn-and-alt-names');
 
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -310,14 +294,14 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"host=common-name.pg-ssltest.test",
-	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 1 other name) does not match host name "common-name.pg-ssltest.test"\E/,
+	qr/SSL_ERROR_BAD_CERT_DOMAIN/,
 	"certificate with both a CN and SANs ignores CN");
 
 # Finally, test a server certificate that has no CN or SANs. Of course, that's
 # not a very sensible certificate, but libpq should handle it gracefully.
 switch_server_cert($node, 'server-no-names');
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -326,7 +310,7 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"sslmode=verify-full host=common-name.pg-ssltest.test",
-	qr/could not get server's host name from server certificate/,
+	qr/could not get server's host name from server certificate|SSL_ERROR_BAD_CERT_DOMAIN/,
 	"server certificate without CN or SANs sslmode=verify-full");
 
 # Test that the CRL works
@@ -338,11 +322,11 @@ $common_connstr =
 # Without the CRL, succeeds. With it, fails.
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca cert_database=ssl/nss/root+server_ca.crt.db",
 	"connects without client-side CRL");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/root+server.crl",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/nss/server.crl.der cert_database=ssl/nss/root+server_ca.crt.db",
 	qr/SSL error/,
 	"does not connect with client-side CRL");
 
@@ -363,21 +347,21 @@ command_like(
 # Test min/max SSL protocol versions.
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.2",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.2 cert_database=ssl/nss/root+server_ca.crt.db",
 	"connection success with correct range of TLS protocol versions");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.1",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.1 cert_database=ssl/nss/root+server_ca.crt.db",
 	qr/invalid SSL protocol version range/,
 	"connection failure with incorrect range of TLS protocol versions");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=incorrect_tls",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=incorrect_tls cert_database=ssl/nss/root+server_ca.crt.db",
 	qr/invalid ssl_min_protocol_version value/,
 	"connection failure with an incorrect SSL protocol minimum bound");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_max_protocol_version=incorrect_tls",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_max_protocol_version=incorrect_tls cert_database=ssl/nss/root+server_ca.crt.db",
 	qr/invalid ssl_max_protocol_version value/,
 	"connection failure with an incorrect SSL protocol maximum bound");
 
@@ -388,7 +372,7 @@ test_connect_fails(
 note "running server tests";
 
 $common_connstr =
-  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR";
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client.crt__client.key.db";
 
 # no client cert
 test_connect_fails(
@@ -400,36 +384,47 @@ test_connect_fails(
 # correct client cert in unencrypted PEM
 test_connect_ok(
 	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client_tmp.key",
+	"user=ssltestuser sslcert=client.crt__client.key sslkey=ssl/client_tmp.key",
 	"certificate authorization succeeds with correct client cert in PEM format"
 );
 
+$common_connstr =
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR";
+
+SKIP:
+{
+	skip "NSS database not implemented in the Makefile", 1 if ($nss);
 # correct client cert in unencrypted DER
 test_connect_ok(
 	$common_connstr,
 	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-der_tmp.key",
 	"certificate authorization succeeds with correct client cert in DER format"
 );
+}
 
 # correct client cert in encrypted PEM
 test_connect_ok(
 	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='dUmmyP^#+'",
+	"user=ssltestuser sslcert=client.crt__client-encrypted-pem.key sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='dUmmyP^#+' cert_database=ssl/nss/client.crt__client-encrypted-pem.key.db",
 	"certificate authorization succeeds with correct client cert in encrypted PEM format"
 );
 
+SKIP:
+{
+	skip "NSS database not implemented in the Makefile", 1 if ($nss);
 # correct client cert in encrypted DER
 test_connect_ok(
 	$common_connstr,
 	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-der_tmp.key sslpassword='dUmmyP^#+'",
 	"certificate authorization succeeds with correct client cert in encrypted DER format"
 );
+}
 
 # correct client cert in encrypted PEM with wrong password
 test_connect_fails(
 	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='wrong'",
-	qr!\Qprivate key file "ssl/client-encrypted-pem_tmp.key": bad decrypt\E!,
+	"user=ssltestuser sslcert=client.crt__client-encrypted-pem.key sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='wrong' cert_database=ssl/nss/client.crt__client-encrypted-pem.key.db",
+	qr!connection requires a valid client certificate|\Qprivate key file "ssl/client-encrypted-pem_tmp.key": bad decrypt\E!,
 	"certificate authorization fails with correct client cert and wrong password in encrypted PEM format"
 );
 
@@ -469,18 +464,19 @@ command_like(
 		'-P',
 		'null=_null_',
 		'-d',
-		"$common_connstr user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client_tmp.key",
+		"$common_connstr user=ssltestuser sslcert=client.crt__client.key sslkey=ssl/client_tmp.key",
 		'-c',
 		"SELECT * FROM pg_stat_ssl WHERE pid = pg_backend_pid()"
 	],
 	qr{^pid,ssl,version,cipher,bits,compression,client_dn,client_serial,issuer_dn\r?\n
-				^\d+,t,TLSv[\d.]+,[\w-]+,\d+,f,/CN=ssltestuser,1,\Q/CN=Test CA for PostgreSQL SSL regression test client certs\E\r?$}mx,
+				^\d+,t,TLSv[\d.]+,[\w-]+,\d+,f,CN=ssltestuser,1,\QCN=Test CA for PostgreSQL SSL regression test client certs\E\r?$}mx,
 	'pg_stat_ssl with client certificate');
 
 # client key with wrong permissions
 SKIP:
 {
 	skip "Permissions check not enforced on Windows", 2 if ($windows_os);
+	skip "Key not on filesystem with NSS", 2 if ($nss);
 
 	test_connect_fails(
 		$common_connstr,
@@ -492,15 +488,18 @@ SKIP:
 # client cert belonging to another user
 test_connect_fails(
 	$common_connstr,
-	"user=anotheruser sslcert=ssl/client.crt sslkey=ssl/client_tmp.key",
-	qr/certificate authentication failed for user "anotheruser"/,
+	"user=anotheruser sslcert=client.crt__client.key sslkey=ssl/client_tmp.key",
+	qr/unable to verify certificate|certificate authentication failed for user "anotheruser"/,
 	"certificate authorization fails with client cert belonging to another user"
 );
 
+$common_connstr =
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client-revoked.crt__client-revoked.key.db";
+
 # revoked client cert
 test_connect_fails(
 	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client-revoked.crt sslkey=ssl/client-revoked_tmp.key",
+	"user=ssltestuser sslcert=client-revoked.crt__client-revoked.key sslkey=ssl/client-revoked_tmp.key",
 	qr/SSL error/,
 	"certificate authorization fails with revoked client cert");
 
@@ -508,17 +507,17 @@ test_connect_fails(
 # works, iff username matches Common Name
 # fails, iff username doesn't match Common Name.
 $common_connstr =
-  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=verifydb hostaddr=$SERVERHOSTADDR";
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=verifydb hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client.crt__client.key.db";
 
 test_connect_ok(
 	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client_tmp.key",
+	"user=ssltestuser sslcert=client.crt__client.key sslkey=ssl/client_tmp.key",
 	"auth_option clientcert=verify-full succeeds with matching username and Common Name"
 );
 
 test_connect_fails(
 	$common_connstr,
-	"user=anotheruser sslcert=ssl/client.crt sslkey=ssl/client_tmp.key",
+	"user=anotheruser sslcert=client.crt__client.key sslkey=ssl/client_tmp.key",
 	qr/FATAL/,
 	"auth_option clientcert=verify-full fails with mismatching username and Common Name"
 );
@@ -527,24 +526,22 @@ test_connect_fails(
 # works, when username doesn't match Common Name
 test_connect_ok(
 	$common_connstr,
-	"user=yetanotheruser sslcert=ssl/client.crt sslkey=ssl/client_tmp.key",
+	"user=yetanotheruser sslcert=client.crt__client.key sslkey=ssl/client_tmp.key",
 	"auth_option clientcert=verify-ca succeeds with mismatching username and Common Name"
 );
 
 # intermediate client_ca.crt is provided by client, and isn't in server's ssl_ca_file
 switch_server_cert($node, 'server-cn-only', 'root_ca');
 $common_connstr =
-  "user=ssltestuser dbname=certdb sslkey=ssl/client_tmp.key sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR";
+  "user=ssltestuser dbname=certdb sslkey=ssl/client_tmp.key sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client+client_ca.crt__client.key.db";
 
 test_connect_ok(
 	$common_connstr,
-	"sslmode=require sslcert=ssl/client+client_ca.crt",
+	"sslmode=require sslcert=client+client_ca.crt__client.key",
 	"intermediate client certificate is provided by client");
-test_connect_fails($common_connstr, "sslmode=require sslcert=ssl/client.crt",
-	qr/SSL error/, "intermediate client certificate is missing");
+test_connect_fails($common_connstr, "sslmode=require sslcert=client.crt__client.key",
+	qr/connection requires a valid client certificate|SSL error/, "intermediate client certificate is missing");
 
 # clean up
-foreach my $key (@keys)
-{
-	unlink("ssl/${key}_tmp.key");
-}
+
+SSL::Server::cleanup();
diff --git a/src/test/ssl/t/002_scram.pl b/src/test/ssl/t/002_scram.pl
index ee6e26d732..2546c4bb6a 100644
--- a/src/test/ssl/t/002_scram.pl
+++ b/src/test/ssl/t/002_scram.pl
@@ -11,11 +11,11 @@ use File::Copy;
 use FindBin;
 use lib $FindBin::RealBin;
 
-use SSLServer;
+use SSL::Server;
 
 if ($ENV{with_openssl} ne 'yes')
 {
-	plan skip_all => 'SSL not supported by this build';
+	plan skip_all => 'OpenSSL not supported by this build';
 }
 
 # This is the hostname used to connect to the server.
diff --git a/src/test/ssl/t/SSL/Backend/NSS.pm b/src/test/ssl/t/SSL/Backend/NSS.pm
new file mode 100644
index 0000000000..2b44831739
--- /dev/null
+++ b/src/test/ssl/t/SSL/Backend/NSS.pm
@@ -0,0 +1,65 @@
+package SSL::Backend::NSS;
+
+use strict;
+use warnings;
+use Exporter;
+
+our @ISA = qw(Exporter);
+our @EXPORT_OK = qw(get_new_nss_backend);
+
+sub new
+{
+	my ($class) = @_;
+
+	my $self = {
+		_library => 'NSS'
+	};
+
+	bless $self, $class;
+
+	return $self;
+}
+
+sub get_new_nss_backend
+{
+	my $class = 'SSL::Backend::NSS';
+
+	return $class->new();
+}
+
+sub init
+{
+	# Make sure the certificate databases are in place?
+}
+
+sub get_library
+{
+	my ($self) = @_;
+
+	return $self->{_library};
+}
+
+sub set_server_cert
+{
+	my $self     = $_[0];
+	my $certfile = $_[1];
+	my $cafile   = $_[2];
+	my $keyfile  = $_[3];
+
+	my $cert_nickname = $certfile . '.crt__' . $keyfile . '.key';
+	my $cert_database = $cert_nickname . '.db';
+
+	my $sslconf = "ssl_ca_file='$cafile.crt'\n" .
+		"ssl_cert_file='$cert_nickname'\n" .
+		"ssl_crl_file=''\n" .
+		"ssl_database='nss/$cert_database'\n";
+
+	return $sslconf;
+}
+
+sub cleanup
+{
+	# Something?
+}
+
+1;
diff --git a/src/test/ssl/t/SSL/Backend/OpenSSL.pm b/src/test/ssl/t/SSL/Backend/OpenSSL.pm
new file mode 100644
index 0000000000..757342d748
--- /dev/null
+++ b/src/test/ssl/t/SSL/Backend/OpenSSL.pm
@@ -0,0 +1,97 @@
+package SSL::Backend::OpenSSL;
+
+use strict;
+use warnings;
+use Exporter;
+
+our @ISA = qw(Exporter);
+our @EXPORT_OK = qw(get_new_openssl_backend);
+
+our (@keys);
+
+INIT
+{
+	@keys = (
+		"client",     "client-revoked",
+		"client-der", "client-encrypted-pem",
+		"client-encrypted-der");
+}
+
+sub new
+{
+	my ($class) = @_;
+
+	my $self = {
+		_library => 'OpenSSL'
+	};
+
+	bless $self, $class;
+
+	return $self;
+}
+
+sub get_new_openssl_backend
+{
+	my $class = 'SSL::Backend::OpenSSL';
+
+	my $backend = $class->new();
+	
+	return $backend;
+}
+
+sub init
+{
+	# The client's private key must not be world-readable, so take a copy
+	# of the key stored in the code tree and update its permissions.
+	#
+	# This changes ssl/client.key to ssl/client_tmp.key etc for the rest
+	# of the tests.
+	foreach my $key (@keys)
+	{
+		copy("ssl/${key}.key", "ssl/${key}_tmp.key")
+		  or die
+		  "couldn't copy ssl/${key}.key to ssl/${key}_tmp.key for permissions change: $!";
+		chmod 0600, "ssl/${key}_tmp.key"
+		  or die "failed to change permissions on ssl/${key}_tmp.key: $!";
+	}
+
+	# Also make a copy of that explicitly world-readable.  We can't
+	# necessarily rely on the file in the source tree having those
+	# permissions.
+	copy("ssl/client.key", "ssl/client_wrongperms_tmp.key");
+	chmod 0644, "ssl/client_wrongperms_tmp.key";
+}
+
+# Change the configuration to use given server cert file, and reload
+# the server so that the configuration takes effect.
+sub set_server_cert
+{
+	my $self     = $_[0];
+	my $certfile = $_[1];
+	my $cafile   = $_[2] || "root+client_ca";
+	my $keyfile  = $_[3] || $certfile;
+
+	my $sslconf = "ssl_ca_file='$cafile.crt'\n" .
+		"ssl_cert_file='$certfile.crt'\n" .
+		"ssl_key_file='$keyfile.key'\n" .
+		"ssl_crl_file='root+client.crl'\n";
+		
+	return $sslconf;
+}
+
+sub get_library
+{
+	my ($self) = @_;
+
+	return $self->{_library};
+}
+
+sub cleanup
+{
+	foreach my $key (@keys)
+	{
+		unlink("ssl/${key}_tmp.key");
+	}
+}
+		
+1;
diff --git a/src/test/ssl/t/SSLServer.pm b/src/test/ssl/t/SSL/Server.pm
similarity index 82%
rename from src/test/ssl/t/SSLServer.pm
rename to src/test/ssl/t/SSL/Server.pm
index 1e392b8fbf..9208946279 100644
--- a/src/test/ssl/t/SSLServer.pm
+++ b/src/test/ssl/t/SSL/Server.pm
@@ -24,15 +24,34 @@
 # explicitly because an invalid sslcert or sslrootcert, respectively,
 # causes those to be ignored.)
 
-package SSLServer;
+package SSL::Server;
 
 use strict;
 use warnings;
 use PostgresNode;
+use RecursiveCopy;
 use TestLib;
 use File::Basename;
 use File::Copy;
 use Test::More;
+use SSL::Backend::OpenSSL qw(get_new_openssl_backend);
+use SSL::Backend::NSS qw(get_new_nss_backend);
+
+our ($openssl, $nss, $backend);
+
+# The TLS backend which the server is using should be mostly transparent for
+# the user, apart from individual configuration settings, so keep the backend
+# specific things abstracted behind SSL::Server.
+if ($ENV{with_openssl} eq 'yes')
+{
+	$backend = get_new_openssl_backend();
+	$openssl = 1;
+}
+elsif ($ENV{with_nss} eq 'yes')
+{
+	$backend = get_new_nss_backend();
+	$nss = 1;
+}
 
 use Exporter 'import';
 our @EXPORT = qw(
@@ -145,12 +164,19 @@ sub configure_test_server_for_ssl
 	close $sslconf;
 
 	# Copy all server certificates and keys, and client root cert, to the data dir
-	copy_files("ssl/server-*.crt", $pgdata);
-	copy_files("ssl/server-*.key", $pgdata);
-	chmod(0600, glob "$pgdata/server-*.key") or die $!;
-	copy_files("ssl/root+client_ca.crt", $pgdata);
-	copy_files("ssl/root_ca.crt",        $pgdata);
-	copy_files("ssl/root+client.crl",    $pgdata);
+	if (defined($openssl))
+	{
+		copy_files("ssl/server-*.crt", $pgdata);
+		copy_files("ssl/server-*.key", $pgdata);
+		chmod(0600, glob "$pgdata/server-*.key") or die $!;
+		copy_files("ssl/root+client_ca.crt", $pgdata);
+		copy_files("ssl/root_ca.crt",        $pgdata);
+		copy_files("ssl/root+client.crl",    $pgdata);
+	}
+	elsif (defined($nss))
+	{
+		RecursiveCopy::copypath("ssl/nss", $pgdata . "/nss") if -e "ssl/nss";
+	}
 
 	# Stop and restart server to load new listen_addresses.
 	$node->restart;
@@ -161,6 +187,16 @@ sub configure_test_server_for_ssl
 	return;
 }
 
+sub ssl_library
+{
+	return $backend->get_library();
+}
+
+sub cleanup
+{
+	$backend->cleanup();
+}
+
 # Change the configuration to use given server cert file, and reload
 # the server so that the configuration takes effect.
 sub switch_server_cert
@@ -168,14 +204,16 @@ sub switch_server_cert
 	my $node     = $_[0];
 	my $certfile = $_[1];
 	my $cafile   = $_[2] || "root+client_ca";
+	my $keyfile  = $_[3] || '';
+	my $pwcmd    = $_[4] || '';
 	my $pgdata   = $node->data_dir;
 
+	$keyfile = $certfile if $keyfile eq '';
+	
 	open my $sslconf, '>', "$pgdata/sslconfig.conf";
 	print $sslconf "ssl=on\n";
-	print $sslconf "ssl_ca_file='$cafile.crt'\n";
-	print $sslconf "ssl_cert_file='$certfile.crt'\n";
-	print $sslconf "ssl_key_file='$certfile.key'\n";
-	print $sslconf "ssl_crl_file='root+client.crl'\n";
+	print $sslconf $backend->set_server_cert($certfile, $cafile, $keyfile);
+	print $sslconf "ssl_passphrase_command='$pwcmd'\n";
 	close $sslconf;
 
 	$node->restart;
-- 
2.21.1 (Apple Git-122.3)

From b2c489f9715d647f709ddcb888ec1d64c231ddca Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Fri, 3 Jul 2020 13:42:21 +0200
Subject: [PATCH 2/2] Make pg_stat_ssl reporting backend agnostic v3

Inspecting Port->ssl for an indication on whether the connection is
using TLS or not is tied to the fact that the current implementation
is using a variable named ssl. Making this a requirement for all TLS
backend implementations seems restricting since there in actual var
tracking the status, ssl_in_use. Switch to inspecting this variable
instead.
---
 src/backend/postmaster/pgstat.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/backend/postmaster/pgstat.c b/src/backend/postmaster/pgstat.c
index c022597bc0..edfa774ee4 100644
--- a/src/backend/postmaster/pgstat.c
+++ b/src/backend/postmaster/pgstat.c
@@ -2989,7 +2989,7 @@ pgstat_bestart(void)
 		MemSet(&lbeentry.st_clientaddr, 0, sizeof(lbeentry.st_clientaddr));
 
 #ifdef USE_SSL
-	if (MyProcPort && MyProcPort->ssl != NULL)
+	if (MyProcPort && MyProcPort->ssl_in_use)
 	{
 		lbeentry.st_ssl = true;
 		lsslstatus.ssl_bits = be_tls_get_cipher_bits(MyProcPort);
-- 
2.21.1 (Apple Git-122.3)

From 20531c638da852348c629f2e2d2f6fbb2014f2c6 Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Fri, 3 Jul 2020 13:34:27 +0200
Subject: [PATCH 1/2] WIP: Support libnss for as TLS backend v3

---
 configure                                     |  235 +++-
 configure.in                                  |   30 +
 src/Makefile.global.in                        |    1 +
 src/backend/libpq/Makefile                    |    4 +
 src/backend/libpq/auth.c                      |    7 +
 src/backend/libpq/be-secure-nss.c             | 1026 +++++++++++++++++
 src/backend/libpq/be-secure.c                 |    3 +
 src/backend/utils/misc/guc.c                  |   20 +-
 src/include/common/pg_nss.h                   |  141 +++
 src/include/libpq/libpq-be.h                  |    9 +-
 src/include/libpq/libpq.h                     |    3 +
 src/include/pg_config.h.in                    |    3 +
 src/include/pg_config_manual.h                |    5 +-
 src/interfaces/libpq/Makefile                 |    4 +
 src/interfaces/libpq/fe-connect.c             |    6 +
 src/interfaces/libpq/fe-secure-nss.c          |  959 +++++++++++++++
 src/interfaces/libpq/libpq-fe.h               |   11 +
 src/interfaces/libpq/libpq-int.h              |    5 +
 src/test/ssl/Makefile                         |  157 +++
 src/test/ssl/t/001_ssltests.pl                |  203 ++--
 src/test/ssl/t/002_scram.pl                   |    4 +-
 src/test/ssl/t/SSL/Backend/NSS.pm             |   65 ++
 src/test/ssl/t/SSL/Backend/OpenSSL.pm         |  102 ++
 .../ssl/t/{SSLServer.pm => SSL/Server.pm}     |   60 +-
 24 files changed, 2934 insertions(+), 129 deletions(-)
 create mode 100644 src/backend/libpq/be-secure-nss.c
 create mode 100644 src/include/common/pg_nss.h
 create mode 100644 src/interfaces/libpq/fe-secure-nss.c
 create mode 100644 src/test/ssl/t/SSL/Backend/NSS.pm
 create mode 100644 src/test/ssl/t/SSL/Backend/OpenSSL.pm
 rename src/test/ssl/t/{SSLServer.pm => SSL/Server.pm} (82%)

diff --git a/configure b/configure
index 2feff37fe3..3f6520ae34 100755
--- a/configure
+++ b/configure
@@ -711,6 +711,7 @@ with_uuid
 with_readline
 with_systemd
 with_selinux
+with_nss
 with_openssl
 with_ldap
 with_krb_srvnam
@@ -798,6 +799,7 @@ infodir
 docdir
 oldincludedir
 includedir
+runstatedir
 localstatedir
 sharedstatedir
 sysconfdir
@@ -856,6 +858,7 @@ with_bsd_auth
 with_ldap
 with_bonjour
 with_openssl
+with_nss
 with_selinux
 with_systemd
 with_readline
@@ -935,6 +938,7 @@ datadir='${datarootdir}'
 sysconfdir='${prefix}/etc'
 sharedstatedir='${prefix}/com'
 localstatedir='${prefix}/var'
+runstatedir='${localstatedir}/run'
 includedir='${prefix}/include'
 oldincludedir='/usr/include'
 docdir='${datarootdir}/doc/${PACKAGE_TARNAME}'
@@ -1187,6 +1191,15 @@ do
   | -silent | --silent | --silen | --sile | --sil)
     silent=yes ;;
 
+  -runstatedir | --runstatedir | --runstatedi | --runstated \
+  | --runstate | --runstat | --runsta | --runst | --runs \
+  | --run | --ru | --r)
+    ac_prev=runstatedir ;;
+  -runstatedir=* | --runstatedir=* | --runstatedi=* | --runstated=* \
+  | --runstate=* | --runstat=* | --runsta=* | --runst=* | --runs=* \
+  | --run=* | --ru=* | --r=*)
+    runstatedir=$ac_optarg ;;
+
   -sbindir | --sbindir | --sbindi | --sbind | --sbin | --sbi | --sb)
     ac_prev=sbindir ;;
   -sbindir=* | --sbindir=* | --sbindi=* | --sbind=* | --sbin=* \
@@ -1324,7 +1337,7 @@ fi
 for ac_var in	exec_prefix prefix bindir sbindir libexecdir datarootdir \
 		datadir sysconfdir sharedstatedir localstatedir includedir \
 		oldincludedir docdir infodir htmldir dvidir pdfdir psdir \
-		libdir localedir mandir
+		libdir localedir mandir runstatedir
 do
   eval ac_val=\$$ac_var
   # Remove trailing slashes.
@@ -1477,6 +1490,7 @@ Fine tuning of the installation directories:
   --sysconfdir=DIR        read-only single-machine data [PREFIX/etc]
   --sharedstatedir=DIR    modifiable architecture-independent data [PREFIX/com]
   --localstatedir=DIR     modifiable single-machine data [PREFIX/var]
+  --runstatedir=DIR       modifiable per-process data [LOCALSTATEDIR/run]
   --libdir=DIR            object code libraries [EPREFIX/lib]
   --includedir=DIR        C header files [PREFIX/include]
   --oldincludedir=DIR     C header files for non-gcc [/usr/include]
@@ -1558,6 +1572,7 @@ Optional Packages:
   --with-ldap             build with LDAP support
   --with-bonjour          build with Bonjour support
   --with-openssl          build with OpenSSL support
+  --with-nss              build with NSS support
   --with-selinux          build with SELinux support
   --with-systemd          build with systemd support
   --without-readline      do not use GNU Readline nor BSD Libedit for editing
@@ -8009,6 +8024,41 @@ fi
 $as_echo "$with_openssl" >&6; }
 
 
+#
+# LibNSS
+#
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether to build with NSS support" >&5
+$as_echo_n "checking whether to build with NSS support... " >&6; }
+
+
+
+# Check whether --with-nss was given.
+if test "${with_nss+set}" = set; then :
+  withval=$with_nss;
+  case $withval in
+    yes)
+
+$as_echo "#define USE_NSS 1" >>confdefs.h
+
+      ;;
+    no)
+      :
+      ;;
+    *)
+      as_fn_error $? "no argument expected for --with-nss option" "$LINENO" 5
+      ;;
+  esac
+
+else
+  with_nss=no
+
+fi
+
+
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $with_nss" >&5
+$as_echo "$with_nss" >&6; }
+
+
 #
 # SELinux
 #
@@ -12083,6 +12133,9 @@ fi
 fi
 
 if test "$with_openssl" = yes ; then
+  if test x"$with_nss" = x"yes" ; then
+    as_fn_error $? "multiple SSL backends cannot be enabled simultaneously\"" "$LINENO" 5
+  fi
     if test "$PORTNAME" != "win32"; then
      { $as_echo "$as_me:${as_lineno-$LINENO}: checking for CRYPTO_new_ex_data in -lcrypto" >&5
 $as_echo_n "checking for CRYPTO_new_ex_data in -lcrypto... " >&6; }
@@ -12341,6 +12394,157 @@ done
 
 fi
 
+if test "$with_nss" = yes ; then
+  if test x"$with_openssl" = x"yes" ; then
+    as_fn_error $? "multiple SSL backends cannot be enabled simultaneously\"" "$LINENO" 5
+  fi
+  CLEANLDFLAGS="$LDFLAGS"
+  # TODO: document this set of LDFLAGS
+  LDFLAGS="-lssl3 -lsmime3 -lnss3 -lplds4 -lplc4 -lnspr4 $LDFLAGS"
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for SSL_VersionRangeSet in -lnss3" >&5
+$as_echo_n "checking for SSL_VersionRangeSet in -lnss3... " >&6; }
+if ${ac_cv_lib_nss3_SSL_VersionRangeSet+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lnss3  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char SSL_VersionRangeSet ();
+int
+main ()
+{
+return SSL_VersionRangeSet ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_lib_nss3_SSL_VersionRangeSet=yes
+else
+  ac_cv_lib_nss3_SSL_VersionRangeSet=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_nss3_SSL_VersionRangeSet" >&5
+$as_echo "$ac_cv_lib_nss3_SSL_VersionRangeSet" >&6; }
+if test "x$ac_cv_lib_nss3_SSL_VersionRangeSet" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_LIBNSS3 1
+_ACEOF
+
+  LIBS="-lnss3 $LIBS"
+
+else
+  as_fn_error $? "library 'nss3' is required for NSS" "$LINENO" 5
+fi
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for PR_GetDefaultIOMethods in -lnspr4" >&5
+$as_echo_n "checking for PR_GetDefaultIOMethods in -lnspr4... " >&6; }
+if ${ac_cv_lib_nspr4_PR_GetDefaultIOMethods+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lnspr4  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char PR_GetDefaultIOMethods ();
+int
+main ()
+{
+return PR_GetDefaultIOMethods ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_lib_nspr4_PR_GetDefaultIOMethods=yes
+else
+  ac_cv_lib_nspr4_PR_GetDefaultIOMethods=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_nspr4_PR_GetDefaultIOMethods" >&5
+$as_echo "$ac_cv_lib_nspr4_PR_GetDefaultIOMethods" >&6; }
+if test "x$ac_cv_lib_nspr4_PR_GetDefaultIOMethods" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_LIBNSPR4 1
+_ACEOF
+
+  LIBS="-lnspr4 $LIBS"
+
+else
+  as_fn_error $? "library 'nspr4' is required for NSS" "$LINENO" 5
+fi
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for SSL_GetImplementedCiphers in -lssl3" >&5
+$as_echo_n "checking for SSL_GetImplementedCiphers in -lssl3... " >&6; }
+if ${ac_cv_lib_ssl3_SSL_GetImplementedCiphers+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lssl3  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char SSL_GetImplementedCiphers ();
+int
+main ()
+{
+return SSL_GetImplementedCiphers ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_lib_ssl3_SSL_GetImplementedCiphers=yes
+else
+  ac_cv_lib_ssl3_SSL_GetImplementedCiphers=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_ssl3_SSL_GetImplementedCiphers" >&5
+$as_echo "$ac_cv_lib_ssl3_SSL_GetImplementedCiphers" >&6; }
+if test "x$ac_cv_lib_ssl3_SSL_GetImplementedCiphers" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_LIBSSL3 1
+_ACEOF
+
+  LIBS="-lssl3 $LIBS"
+
+else
+  as_fn_error $? "library 'ssl3' is required for NSS" "$LINENO" 5
+fi
+
+  LDFLAGS="$CLEANLDFLAGS"
+fi
+
 if test "$with_pam" = yes ; then
   { $as_echo "$as_me:${as_lineno-$LINENO}: checking for pam_start in -lpam" >&5
 $as_echo_n "checking for pam_start in -lpam... " >&6; }
@@ -13243,6 +13447,25 @@ else
 fi
 
 
+fi
+
+if test "$with_nss" = yes ; then
+  ac_fn_c_check_header_mongrel "$LINENO" "ssl.h" "ac_cv_header_ssl_h" "$ac_includes_default"
+if test "x$ac_cv_header_ssl_h" = xyes; then :
+
+else
+  as_fn_error $? "header file <ssl.h> is required for NSS" "$LINENO" 5
+fi
+
+
+  ac_fn_c_check_header_mongrel "$LINENO" "nss.h" "ac_cv_header_nss_h" "$ac_includes_default"
+if test "x$ac_cv_header_nss_h" = xyes; then :
+
+else
+  as_fn_error $? "header file <nss.h> is required for NSS" "$LINENO" 5
+fi
+
+
 fi
 
 if test "$with_pam" = yes ; then
@@ -14588,7 +14811,7 @@ else
     We can't simply define LARGE_OFF_T to be 9223372036854775807,
     since some C++ compilers masquerading as C compilers
     incorrectly reject 9223372036854775807.  */
-#define LARGE_OFF_T (((off_t) 1 << 62) - 1 + ((off_t) 1 << 62))
+#define LARGE_OFF_T ((((off_t) 1 << 31) << 31) - 1 + (((off_t) 1 << 31) << 31))
   int off_t_is_large[(LARGE_OFF_T % 2147483629 == 721
 		       && LARGE_OFF_T % 2147483647 == 1)
 		      ? 1 : -1];
@@ -14634,7 +14857,7 @@ else
     We can't simply define LARGE_OFF_T to be 9223372036854775807,
     since some C++ compilers masquerading as C compilers
     incorrectly reject 9223372036854775807.  */
-#define LARGE_OFF_T (((off_t) 1 << 62) - 1 + ((off_t) 1 << 62))
+#define LARGE_OFF_T ((((off_t) 1 << 31) << 31) - 1 + (((off_t) 1 << 31) << 31))
   int off_t_is_large[(LARGE_OFF_T % 2147483629 == 721
 		       && LARGE_OFF_T % 2147483647 == 1)
 		      ? 1 : -1];
@@ -14658,7 +14881,7 @@ rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
     We can't simply define LARGE_OFF_T to be 9223372036854775807,
     since some C++ compilers masquerading as C compilers
     incorrectly reject 9223372036854775807.  */
-#define LARGE_OFF_T (((off_t) 1 << 62) - 1 + ((off_t) 1 << 62))
+#define LARGE_OFF_T ((((off_t) 1 << 31) << 31) - 1 + (((off_t) 1 << 31) << 31))
   int off_t_is_large[(LARGE_OFF_T % 2147483629 == 721
 		       && LARGE_OFF_T % 2147483647 == 1)
 		      ? 1 : -1];
@@ -14703,7 +14926,7 @@ else
     We can't simply define LARGE_OFF_T to be 9223372036854775807,
     since some C++ compilers masquerading as C compilers
     incorrectly reject 9223372036854775807.  */
-#define LARGE_OFF_T (((off_t) 1 << 62) - 1 + ((off_t) 1 << 62))
+#define LARGE_OFF_T ((((off_t) 1 << 31) << 31) - 1 + (((off_t) 1 << 31) << 31))
   int off_t_is_large[(LARGE_OFF_T % 2147483629 == 721
 		       && LARGE_OFF_T % 2147483647 == 1)
 		      ? 1 : -1];
@@ -14727,7 +14950,7 @@ rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
     We can't simply define LARGE_OFF_T to be 9223372036854775807,
     since some C++ compilers masquerading as C compilers
     incorrectly reject 9223372036854775807.  */
-#define LARGE_OFF_T (((off_t) 1 << 62) - 1 + ((off_t) 1 << 62))
+#define LARGE_OFF_T ((((off_t) 1 << 31) << 31) - 1 + (((off_t) 1 << 31) << 31))
   int off_t_is_large[(LARGE_OFF_T % 2147483629 == 721
 		       && LARGE_OFF_T % 2147483647 == 1)
 		      ? 1 : -1];
diff --git a/configure.in b/configure.in
index 0188c6ff07..afa90f7fbc 100644
--- a/configure.in
+++ b/configure.in
@@ -854,6 +854,15 @@ PGAC_ARG_BOOL(with, openssl, no, [build with OpenSSL support],
 AC_MSG_RESULT([$with_openssl])
 AC_SUBST(with_openssl)
 
+#
+# LibNSS
+#
+AC_MSG_CHECKING([whether to build with NSS support])
+PGAC_ARG_BOOL(with, nss, no, [build with NSS support],
+              [AC_DEFINE([USE_NSS], 1, [Define to build with NSS support. (--with-nss)])])
+AC_MSG_RESULT([$with_nss])
+AC_SUBST(with_nss)
+
 #
 # SELinux
 #
@@ -1203,6 +1212,9 @@ if test "$with_gssapi" = yes ; then
 fi
 
 if test "$with_openssl" = yes ; then
+  if test x"$with_nss" = x"yes" ; then
+    AC_MSG_ERROR([multiple SSL backends cannot be enabled simultaneously"])
+  fi
   dnl Order matters!
   if test "$PORTNAME" != "win32"; then
      AC_CHECK_LIB(crypto, CRYPTO_new_ex_data, [], [AC_MSG_ERROR([library 'crypto' is required for OpenSSL])])
@@ -1225,6 +1237,19 @@ if test "$with_openssl" = yes ; then
   AC_CHECK_FUNCS([CRYPTO_lock])
 fi
 
+if test "$with_nss" = yes ; then
+  if test x"$with_openssl" = x"yes" ; then
+    AC_MSG_ERROR([multiple SSL backends cannot be enabled simultaneously"])
+  fi
+  CLEANLDFLAGS="$LDFLAGS"
+  # TODO: document this set of LDFLAGS
+  LDFLAGS="-lssl3 -lsmime3 -lnss3 -lplds4 -lplc4 -lnspr4 $LDFLAGS"
+  AC_CHECK_LIB(nss3, SSL_VersionRangeSet, [], [AC_MSG_ERROR([library 'nss3' is required for NSS])])
+  AC_CHECK_LIB(nspr4, PR_GetDefaultIOMethods, [], [AC_MSG_ERROR([library 'nspr4' is required for NSS])])
+  AC_CHECK_LIB(ssl3, SSL_GetImplementedCiphers, [], [AC_MSG_ERROR([library 'ssl3' is required for NSS])])
+  LDFLAGS="$CLEANLDFLAGS"
+fi
+
 if test "$with_pam" = yes ; then
   AC_CHECK_LIB(pam,    pam_start, [], [AC_MSG_ERROR([library 'pam' is required for PAM])])
 fi
@@ -1400,6 +1425,11 @@ if test "$with_openssl" = yes ; then
   AC_CHECK_HEADER(openssl/err.h, [], [AC_MSG_ERROR([header file <openssl/err.h> is required for OpenSSL])])
 fi
 
+if test "$with_nss" = yes ; then
+  AC_CHECK_HEADER(ssl.h, [], [AC_MSG_ERROR([header file <ssl.h> is required for NSS])])
+  AC_CHECK_HEADER(nss.h, [], [AC_MSG_ERROR([header file <nss.h> is required for NSS])])
+fi
+
 if test "$with_pam" = yes ; then
   AC_CHECK_HEADERS(security/pam_appl.h, [],
                    [AC_CHECK_HEADERS(pam/pam_appl.h, [],
diff --git a/src/Makefile.global.in b/src/Makefile.global.in
index 9a6265b3a0..1f1706c4d0 100644
--- a/src/Makefile.global.in
+++ b/src/Makefile.global.in
@@ -184,6 +184,7 @@ with_perl	= @with_perl@
 with_python	= @with_python@
 with_tcl	= @with_tcl@
 with_openssl	= @with_openssl@
+with_nss        = @with_nss@
 with_readline	= @with_readline@
 with_selinux	= @with_selinux@
 with_systemd	= @with_systemd@
diff --git a/src/backend/libpq/Makefile b/src/backend/libpq/Makefile
index efc5ef760a..191266a426 100644
--- a/src/backend/libpq/Makefile
+++ b/src/backend/libpq/Makefile
@@ -30,6 +30,10 @@ OBJS = \
 
 ifeq ($(with_openssl),yes)
 OBJS += be-secure-openssl.o
+else
+ifeq ($(with_nss),yes)
+OBJS += be-secure-nss.o
+endif
 endif
 
 ifeq ($(with_gssapi),yes)
diff --git a/src/backend/libpq/auth.c b/src/backend/libpq/auth.c
index 02b6c3f127..8f4197d002 100644
--- a/src/backend/libpq/auth.c
+++ b/src/backend/libpq/auth.c
@@ -2870,7 +2870,14 @@ CheckCertAuth(Port *port)
 {
 	int			status_check_usermap = STATUS_ERROR;
 
+#if defined(USE_OPENSSL)
 	Assert(port->ssl);
+#elif defined(USE_NSS)
+	/* TODO: should we rename pr_fd to ssl, to keep consistency? */
+	Assert(port->pr_fd);
+#else
+	Assert(false);
+#endif
 
 	/* Make sure we have received a username in the certificate */
 	if (port->peer_cn == NULL ||
diff --git a/src/backend/libpq/be-secure-nss.c b/src/backend/libpq/be-secure-nss.c
new file mode 100644
index 0000000000..07df6c2752
--- /dev/null
+++ b/src/backend/libpq/be-secure-nss.c
@@ -0,0 +1,1026 @@
+/*-------------------------------------------------------------------------
+ *
+ * be-secure-nss.c
+ *	  functions for supporting NSS as a TLS backend
+ *
+ *
+ * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ *	  src/backend/libpq/be-secure-nss.c
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#include "postgres.h"
+
+#include <sys/stat.h>
+
+/*
+ * BITS_PER_BYTE is also defined in the NSPR header fils, so we need to undef
+ * our version to avoid compiler warnings on redefinition.
+ */
+#define pg_BITS_PER_BYTE BITS_PER_BYTE
+#undef BITS_PER_BYTE
+
+/*
+ * The nspr/obsolete/protypes.h NSPR header typedefs uint64 and int64 with
+ * colliding definitions from ours, causing a much expected compiler error.
+ * The definitions are however not actually used in NSPR at all, and are only
+ * intended for what seems to be backwards compatibility for apps written
+ * against old versions of NSPR.  The following comment is in the referenced
+ * file, and was added in 1998:
+ *
+ *		This section typedefs the old 'native' types to the new PR<type>s.
+ *		These definitions are scheduled to be eliminated at the earliest
+ *		possible time. The NSPR API is implemented and documented using
+ *		the new definitions.
+ *
+ * As there is no opt-out from pulling in these typedefs, we define the guard
+ * for the file to exclude it. This is incredibly ugly, but seems to be about
+ * the only way around it.
+ */
+#define PROTYPES_H
+#include <nspr.h>
+#undef PROTYPES_H
+#include <nss.h>
+#include <prio.h>
+#include <ssl.h>
+#include <sslerr.h>
+#include <secerr.h>
+#include <sslproto.h>
+#include <prtypes.h>
+#include <pk11pub.h>
+#include <secitem.h>
+#include <secport.h>
+#include <secder.h>
+#include <certdb.h>
+#include <base64.h>
+#include <cert.h>
+#include <prerror.h>
+#include <keyhi.h>
+
+typedef struct
+{
+	enum
+	{
+		PW_NONE = 0,
+		PW_FROMFILE = 1,
+		PW_PLAINTEXT = 2,
+		PW_EXTERNAL = 3
+	} source;
+	char *data;
+} secuPWData;
+
+/*
+ * Ensure that the colliding definitions match, else throw an error. In case
+ * NSPR has removed the definition for some reasone, make sure to put ours
+ * back again.
+ */
+#if defined(BITS_PER_BYTE)
+#  if BITS_PER_BYTE != pg_BITS_PER_BYTE
+#    error "incompatible byte widths between NSPR and postgres"
+#  endif
+#else
+#  define BITS_PER_BYTE pg_BITS_PER_BYTE
+#endif
+#undef pg_BITS_PER_BYTE
+
+#include "common/pg_nss.h"
+#include "lib/stringinfo.h"
+#include "libpq/libpq.h"
+#include "nodes/pg_list.h"
+#include "miscadmin.h"
+#include "storage/fd.h"
+#include "utils/guc.h"
+#include "utils/memutils.h"
+
+static PRDescIdentity pr_id;
+
+static PRIOMethods				pr_iomethods;
+static NSSInitContext		   *nss_context = NULL;
+static SSLVersionRange			desired_sslver;
+
+/*
+ * PR_ImportTCPSocket() is a private API, but very widely used, as it's the
+ * only way to make NSS use an already set up POSIX file descriptor rather
+ * than opening one itself. To quote the NSS documentation:
+ *
+ *		"In theory, code that uses PR_ImportTCPSocket may break when NSPR's
+ *		implementation changes. In practice, this is unlikely to happen because
+ *		NSPR's implementation has been stable for years and because of NSPR's
+ *		strong commitment to backward compatibility."
+ *
+ * https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSPR/Reference/PR_ImportTCPSocket
+ *
+ * The function is declared in <private/pprio.h>, but as it is a header marked
+ * private we declare it here rather than including it.
+ */
+NSPR_API(PRFileDesc*) PR_ImportTCPSocket(int);
+
+/* NSS IO layer callback overrides */
+static PRInt32 pg_ssl_read(PRFileDesc *fd, void *buf, PRInt32 amount,
+						   PRIntn flags, PRIntervalTime timeout);
+static PRInt32 pg_ssl_write(PRFileDesc *fd, const void *buf, PRInt32 amount,
+							PRIntn flags, PRIntervalTime timeout);
+/* Utility functions */
+static PRFileDesc *init_iolayer(Port *port, int loglevel);
+static uint16 ssl_protocol_version_to_nss(int v, const char *guc_name);
+
+static char *pg_SSLerrmessage(PRErrorCode errcode);
+static char *ssl_protocol_version_to_string(int v);
+static SECStatus pg_cert_auth_handler(void *arg, PRFileDesc *fd,
+			PRBool checksig, PRBool isServer);
+static SECStatus pg_bad_cert_handler(void *arg, PRFileDesc *fd);
+
+/* ------------------------------------------------------------ */
+/*						 Public interface						*/
+/* ------------------------------------------------------------ */
+
+static char *
+ssl_passphrase_callback(PK11SlotInfo *slot, PRBool retry, void *arg)
+{
+	return pstrdup("");
+}
+
+/*
+ * be_tls_init
+ *			Initialize the nss TLS library in the postmaster
+ *
+ * The majority of the setup needs to happen in be_tls_open_server since the
+ * NSPR initialization must happen after the forking of the backend. We could
+ * potentially move some parts in under !isServerStart, but so far this is the
+ * separation chosen.
+ */
+int
+be_tls_init(bool isServerStart)
+{
+	SECStatus			status;
+	SSLVersionRange		supported_sslver;
+
+	/*
+	 * Set up the connection cache for multi-processing application behavior.
+	 * If we are in ServerStart then we initialize the cache. If the server is
+	 * already started, we inherit the cache such that it can be used for
+	 * connections. Calling SSL_ConfigMPServerSIDCache sets an environment
+	 * variable which contains enough information for the forked child to know
+	 * how to access it.  Passing NULL to SSL_InheritMPServerSIDCache will make
+	 * the forked child look it up by the default name SSL_INHERITANCE, if env
+	 * vars aren't inherited then the contents of the variable can be passed
+	 * instead.
+	 */
+	if (isServerStart)
+	{
+		/*
+		 * SSLv2 and SSLv3 are disabled in this TLS backend, but when setting
+		 * up the required session cache for NSS we still must supply timeout
+		 * values for v2 and The minimum allowed value for both is 5
+		 * seconds, so opt for that in both cases (the defaults being 100
+		 * seconds and 24 hours).
+		 *
+		 * Passing NULL as the directory for the session cache will default to
+		 * using /tmp on UNIX and \\temp on Windows.  Deciding if we want to
+		 * keep closer control on this directory is left as a TODO.
+		 */
+		status = SSL_ConfigMPServerSIDCache(MaxConnections, 5, 5, NULL);
+		if (status != SECSuccess)
+			ereport(FATAL,
+					(errmsg("unable to set up TLS connection cache: %s",
+							pg_SSLerrmessage(PR_GetError()))));
+
+	}
+	else
+	{
+		status = SSL_InheritMPServerSIDCache(NULL);
+		if (status != SECSuccess)
+		{
+			ereport(LOG,
+					(errmsg("unable to connect to TLS connection cache: %s",
+							pg_SSLerrmessage(PR_GetError()))));
+			return -1;
+		}
+	}
+
+	if (!ssl_database || strlen(ssl_database) == 0)
+	{
+		ereport(isServerStart ? FATAL : LOG,
+				(errmsg("no certificate database specified")));
+		goto error;
+	}
+
+	/*
+	 * We check for the desired TLS version range here, even though we cannot
+	 * set it until be_open_server such that we can be compatible with how the
+	 * OpenSSL backend reports errors for incompatible range configurations.
+	 * Set either the default supported TLS version range, or the configured
+	 * range from ssl_min_protocol_version and ssl_max_protocol version. In
+	 * case the user hasn't defined the maximum allowed version we fall back
+	 * to the highest version TLS that the library supports.
+	 */
+	if (SSL_VersionRangeGetSupported(ssl_variant_stream, &supported_sslver) != SECSuccess)
+	{
+		ereport(isServerStart ? FATAL : LOG,
+				(errmsg("unable to get default protocol support from NSS")));
+		goto error;
+	}
+
+	/*
+	 * Set the fallback versions for the TLS protocol version range to a
+	 * combination of our minimal requirement and the library maximum.
+	 */
+	desired_sslver.min = SSL_LIBRARY_VERSION_TLS_1_0;
+	desired_sslver.max = supported_sslver.max;
+
+	if (ssl_min_protocol_version)
+	{
+		int ver = ssl_protocol_version_to_nss(ssl_min_protocol_version,
+											  "ssl_min_protocol_version");
+		if (ver == -1)
+		{
+			ereport(isServerStart ? FATAL : LOG,
+					(errmsg("\"%s\" setting \"%s\" not supported by this build",
+							"ssl_min_protocol_version",
+							GetConfigOption("ssl_min_protocol_version",
+											false, false))));
+			goto error;
+		}
+
+		if (ver > 0)
+			desired_sslver.min = ver;
+	}
+
+	if (ssl_max_protocol_version)
+	{
+		int ver = ssl_protocol_version_to_nss(ssl_max_protocol_version,
+											  "ssl_max_protocol_version");
+		if (ver == -1)
+		{
+			ereport(isServerStart ? FATAL : LOG,
+					(errmsg("\"%s\" setting \"%s\" not supported by this build",
+							"ssl_max_protocol_version",
+							GetConfigOption("ssl_max_protocol_version",
+											false, false))));
+			goto error;
+		}
+		if (ver > 0)
+			desired_sslver.max = ver;
+
+		if (ver < desired_sslver.min)
+		{
+			ereport(isServerStart ? FATAL : LOG,
+					(errmsg("could not set SSL protocol version range"),
+					 errdetail("\"%s\" cannot be higher than \"%s\"",
+							   "ssl_min_protocol_version",
+							   "ssl_max_protocol_version")));
+			goto error;
+		}
+	}
+
+	return 0;
+error:
+	return -1;
+}
+
+int
+be_tls_open_server(Port *port)
+{
+	SECStatus			status;
+	PRFileDesc		   *model;
+	PRFileDesc		   *pr_fd;
+	PRFileDesc		   *layer;
+	CERTCertificate	   *server_cert;
+	SECKEYPrivateKey   *private_key;
+	CERTSignedCrl	   *crl;
+	SECItem				crlname;
+	secuPWData pwdata = { PW_NONE, 0 };		/* TODO: This is a bogus callback */
+	char			   *cert_database;
+	NSSInitParameters	params;
+
+	/*
+	 * The NSPR documentation states that runtime initialization via PR_Init is
+	 * no longer required, as the first caller into NSPR will perform the
+	 * initialization implicitly. The documentation doesn't however clarify
+	 * from which version this is holds true, so let's perform the potentially
+	 * superfluous initialization anyways to avoid crashing on older versions
+	 * of NSPR, as there is no difference in overhead.  The NSS documentation
+	 * still states that PR_Init must be called in some way (implicitly or
+	 * explicitly).
+	 *
+	 * The below parameters are what the implicit initialization would've done
+	 * for us, and should work even for older versions where it might not be
+	 * done automatically. The last parameter, maxPTDs, is set to various
+	 * values in other codebases, but has been unused since NSPR 2.1 which was
+	 * released sometime in 1998.
+	 */
+	PR_Init(PR_USER_THREAD, PR_PRIORITY_NORMAL, 0 /* maxPTDs */);
+
+	/*
+	 * The certificate path (configdir) must contain a valid NSS database.
+	 * If the certificate path isn't a valid directory, NSS will fall back on
+	 * the system certificate database. If the certificate path is a directory
+	 * but is empty then the initialization will fail. On the client side this
+	 * can be allowed for any sslmode but the verify-xxx ones.
+	 * https://bugzilla.redhat.com/show_bug.cgi?id=728562
+	 * For the server side we wont allow this to fail however, as we require
+	 * the certificate and key to exist.
+	 *
+	 * The original design of NSS was for a single application to use a single
+	 * copy of it, initialized with NSS_Initialize() which isn't returning any
+	 * handle with which to refer to NSS. NSS initialization and shutdown are
+	 * global for the application, so a shutdown in another NSS enabled library
+	 * would cause NSS to be stopped for libpq as well.  The fix has been to
+	 * introduce NSS_InitContext which returns a context handle to pass to
+	 * NSS_ShutdownContext.  NSS_InitContext was introduced in NSS 3.12, but
+	 * the use of it is not very well documented.
+	 * https://bugzilla.redhat.com/show_bug.cgi?id=738456
+	 *
+	 * The InitParameters struct passed can be used to override internal values
+	 * in NSS, but the usage is not documented at all. When using NSS_Init
+	 * initializations, the values are instead set via PK11_Configure calls so
+	 * the PK11_Configure documentation can be used to glean some details on
+	 * these.
+	 *
+	 * https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS/PKCS11/Module_Specs
+	 */
+	memset(&params, '\0', sizeof(params));
+	params.length = sizeof(params);
+
+	if (!ssl_database || strlen(ssl_database) == 0)
+		ereport(FATAL,
+				(errmsg("no certificate database specified")));
+
+	cert_database = psprintf("sql:%s", ssl_database);
+	nss_context = NSS_InitContext(cert_database, "", "", "",
+								  &params,
+								  NSS_INIT_READONLY | NSS_INIT_PK11RELOAD);
+	pfree(cert_database);
+
+	if (!nss_context)
+		ereport(FATAL,
+				(errmsg("unable to read certificate database \"%s\": %s",
+						ssl_database, pg_SSLerrmessage(PR_GetError()))));
+
+	/*
+	 * Set the passphrase callback which will be used both to obtain the
+	 * passphrase from the user, as well as by NSS to obtain the phrase
+	 * repeatedly.
+	 *
+	 * TODO: Figure this out - do note that we are setting another password
+	 * callback below for cert/key as well. Need to make sense of all these.
+	 */
+	PK11_SetPasswordFunc(ssl_passphrase_callback);
+
+	/*
+	 * Import the already opened socket as we don't want to use NSPR functions
+	 * for opening the network socket due to how the PostgreSQL protocol works
+	 * with TLS connections. This function is not part of the NSPR public API,
+	 * see the comment at the top of the file for the rationale of still using
+	 * it.
+	 */
+	pr_fd = PR_ImportTCPSocket(port->sock);
+	if (!pr_fd)
+		ereport(ERROR,
+				(errmsg("unable to connect to socket")));
+
+	/*
+	 * Most of the documentation available, and implementations of, NSS/NSPR
+	 * use the PR_NewTCPSocket() function here, which has the drawback that it
+	 * can only create IPv4 sockets. Instead use PR_OpenTCPSocket() which copes
+	 * with IPv6 as well.
+	 */
+	model = PR_OpenTCPSocket(port->laddr.addr.ss_family);
+	if (!model)
+		ereport(ERROR,
+				(errmsg("unable to open socket")));
+
+	/*
+	 * Convert the NSPR socket to an SSL socket. Ensuring the success of this
+	 * operation is critical as NSS SSL_* functions may return SECSuccess on
+	 * the socket even though SSL hasn't been enabled, which introduce a risk
+	 * of silent downgrades.
+	 */
+	model = SSL_ImportFD(NULL, model);
+	if (!model)
+		ereport(ERROR,
+				(errmsg("unable to enable TLS on socket")));
+
+	/*
+	 * Configure basic settings for the connection over the SSL socket in
+	 * order to set it up as a server.
+	 */
+	if (SSL_OptionSet(model, SSL_SECURITY, PR_TRUE) != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to configure TLS connection")));
+
+	if (SSL_OptionSet(model, SSL_HANDSHAKE_AS_SERVER, PR_TRUE) != SECSuccess ||
+		SSL_OptionSet(model, SSL_HANDSHAKE_AS_CLIENT, PR_FALSE) != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to configure TLS connection as server")));
+
+	/*
+	 * SSLv2 is disabled by default, and SSLv3 will be excluded from the range
+	 * of allowed protocols further down. Since we really don't want these to
+	 * ever be enabled, let's use belts and suspenders and explicitly turn
+	 * them off as well.
+	 */
+	SSL_OptionSet(model, SSL_ENABLE_SSL2, PR_FALSE);
+	SSL_OptionSet(model, SSL_ENABLE_SSL3, PR_FALSE);
+
+#ifdef SSL_CBC_RANDOM_IV
+	/*
+	 * Enable protection against the BEAST attack in case the NSS server has
+	 * support for that. While SSLv3 is disabled, we may still allow TLSv1
+	 * which is affected. The option isn't documented as an SSL option, but as
+	 * an NSS environment variable.
+	 */
+	SSL_OptionSet(model, SSL_CBC_RANDOM_IV, PR_TRUE);
+#endif
+
+	/*
+	 * Configure the allowed cipher. If there are no user preferred suites, set
+	 * the domestic policy. TODO: while this code works, the set of ciphers
+	 * which can be set and still end up with a working socket is woefully
+	 * underdocumented for anything more recent than SSLv3 (the code for TLS
+	 * actually calls ssl3 functions under the hood for SSL_CipherPrefSet),
+	 * so it's unclear if this is helpful or not. Using the policies works,
+	 * but may be too coarsely grained.
+	 *
+	 * Another TODO: The SSL_ImplementedCiphers table returned with calling
+	 * SSL_GetImplementedCiphers is sorted in server preference order. Sorting
+	 * SSLCipherSuites according to the order of the ciphers therein could be
+	 * a way to implement ssl_prefer_server_ciphers - if we at all want to use
+	 * cipher selection for NSS like how we do it for OpenSSL that is.
+	 */
+
+	/*
+	 * If no ciphers are specified, we use the domestic policy
+	 */
+	if (!SSLCipherSuites || strlen(SSLCipherSuites) == 0)
+	{
+		status = NSS_SetDomesticPolicy();
+		if (status != SECSuccess)
+			ereport(ERROR,
+					(errmsg("unable to set cipher policy: %s",
+							pg_SSLerrmessage(PR_GetError()))));
+	}
+	else
+	{
+		char		   *ciphers, *c, *b;
+		char		   *sep = ":;, ";
+		PRUint16		ciphercode;
+		const PRUint16 *nss_ciphers;
+
+		/*
+		 * If the user has specified a set of preferred cipher suites we start
+		 * by turning off all the existing suites to avoid the risk of down-
+		 * grades to a weaker cipher than expected.
+		 */
+		nss_ciphers = SSL_GetImplementedCiphers();
+		for (int i = 0; i < SSL_GetNumImplementedCiphers(); i++)
+			SSL_CipherPrefSet(model, nss_ciphers[i], PR_FALSE);
+
+		ciphers = pstrdup(SSLCipherSuites);
+
+		for (c = strtok_r(ciphers, sep, &b); c; c = strtok_r(NULL, sep, &b))
+		{
+			ciphercode = pg_find_cipher(c);
+			if (ciphercode != INVALID_CIPHER)
+			{
+				status = SSL_CipherPrefSet(model, ciphercode, PR_TRUE);
+				if (status != SECSuccess)
+					ereport(ERROR,
+							(errmsg("invalid cipher-suite specified: %s", c)));
+			}
+		}
+
+		pfree(ciphers);
+	}
+
+	if (SSL_VersionRangeSet(model, &desired_sslver) != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to set requested SSL protocol version range")));
+
+	/*
+	 * Set up the custom IO layer.
+	 */
+	layer = init_iolayer(port, ERROR);
+	if (!layer)
+		goto error;
+
+	/* Store the Port as private data available in callbacks */
+	layer->secret = (void *) port;
+
+	if (PR_PushIOLayer(pr_fd, PR_TOP_IO_LAYER, layer) != PR_SUCCESS)
+	{
+		PR_Close(layer);
+		ereport(ERROR,
+				(errmsg("unable to push IO layer")));
+	}
+
+	/* TODO: set the postgres password callback param as callback function */
+	server_cert = PK11_FindCertFromNickname(ssl_cert_file, &pwdata /* password callback */);
+	if (!server_cert)
+		ereport(ERROR,
+				(errmsg("unable to find certificate for \"%s\": %s",
+						ssl_cert_file, pg_SSLerrmessage(PR_GetError()))));
+
+	/* TODO: set the postgres password callback param as callback function */
+	private_key = PK11_FindKeyByAnyCert(server_cert, &pwdata /* password callback */);
+	if (!private_key)
+		ereport(ERROR,
+				(errmsg("unable to find private key for \"%s\": %s",
+						ssl_cert_file, pg_SSLerrmessage(PR_GetError()))));
+
+	/*
+	 * NSS doesn't use CRL files on disk, so we use the ssl_crl_file guc to
+	 * contain the CRL nickname for the current server certificate in the NSS
+	 * certificate database. The main difference from the OpenSSL backend is
+	 * that NSS will use the CRL regardless, but being able to make sure the
+	 * CRL is loaded seems like a good feature.
+	 */
+	if (ssl_crl_file[0])
+	{
+		SECITEM_CopyItem(NULL, &crlname, &server_cert->derSubject);
+		crl = SEC_FindCrlByName(CERT_GetDefaultCertDB(), &crlname, SEC_CRL_TYPE);
+		if (!crl)
+			ereport(ERROR,
+					(errmsg("specified CRL not found in database")));
+		SEC_DestroyCrl(crl);
+	}
+
+	/*
+	 * Finally we must configure the socket for being a server by setting the
+	 * certificate and key.
+	 */
+	status = SSL_ConfigSecureServer(model, server_cert, private_key, kt_rsa);
+	if (status != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to configure secure server: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+	status = SSL_ConfigServerCert(model, server_cert, private_key, NULL, 0);
+	if (status != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to configure server for TLS server connections: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+
+	ssl_loaded_verify_locations = true;
+
+	/*
+	 * At this point, we no longer have use for the certificate and private
+	 * key as they have been copied into the context by NSS. Destroy our
+	 * copies explicitly to clean out the memory as best we can.
+	 */
+	CERT_DestroyCertificate(server_cert);
+	SECKEY_DestroyPrivateKey(private_key);
+
+	status = SSL_AuthCertificateHook(model, pg_cert_auth_handler, (void *) port);
+	if (status != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to install authcert hook: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+	SSL_BadCertHook(model, pg_bad_cert_handler, (void *) port);
+	SSL_OptionSet(model, SSL_REQUEST_CERTIFICATE, PR_TRUE);
+	SSL_OptionSet(model, SSL_REQUIRE_CERTIFICATE, PR_FALSE);
+
+	port->pr_fd = SSL_ImportFD(model, pr_fd);
+	if (!port->pr_fd)
+		ereport(ERROR,
+				(errmsg("unable to initialize")));
+
+	PR_Close(model);
+
+	/*
+	 * Force a handshake on the next I/O request, the second parameter means
+	 * that we are a server, PR_FALSE would indicate being a client. NSPR
+	 * requires us to call SSL_ResetHandshake since we imported an already
+	 * established socket.
+	 */
+	status = SSL_ResetHandshake(port->pr_fd, PR_TRUE);
+	if (status != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to initiate handshake: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+	status = SSL_ForceHandshake(port->pr_fd);
+	if (status != SECSuccess)
+		ereport(ERROR,
+			(errmsg("unable to handshake: %s",
+					pg_SSLerrmessage(PR_GetError()))));
+
+	port->ssl_in_use = true;
+	return 0;
+
+error:
+	return 1;
+}
+
+ssize_t
+be_tls_read(Port *port, void *ptr, size_t len, int *waitfor)
+{
+	ssize_t			n_read;
+	PRErrorCode		err;
+
+	n_read = PR_Read(port->pr_fd, ptr, len);
+
+	if (n_read < 0)
+	{
+		err = PR_GetError();
+
+		/* XXX: This logic seems potentially bogus? */
+		if (err == PR_WOULD_BLOCK_ERROR)
+			*waitfor = WL_SOCKET_READABLE;
+		else
+			*waitfor = WL_SOCKET_WRITEABLE;
+	}
+
+	return n_read;
+}
+
+ssize_t
+be_tls_write(Port *port, void *ptr, size_t len, int *waitfor)
+{
+	ssize_t			n_write;
+	PRErrorCode		err;
+
+	n_write = PR_Send(port->pr_fd, ptr, len, 0, PR_INTERVAL_NO_WAIT);
+
+	if (n_write < 0)
+	{
+		err = PR_GetError();
+
+		if (err == PR_WOULD_BLOCK_ERROR)
+			*waitfor = WL_SOCKET_WRITEABLE;
+		else
+			*waitfor = WL_SOCKET_READABLE;
+	}
+
+	return n_write;
+}
+
+void
+be_tls_close(Port *port)
+{
+	if (!port)
+		return;
+
+	if (port->peer_cn)
+	{
+		SSL_InvalidateSession(port->pr_fd);
+		pfree(port->peer_cn);
+		port->peer_cn = NULL;
+	}
+
+	PR_Close(port->pr_fd);
+	port->pr_fd = NULL;
+	port->ssl_in_use = false;
+
+	if (nss_context)
+	{
+		NSS_ShutdownContext(nss_context);
+		nss_context = NULL;
+	}
+}
+
+void
+be_tls_destroy(void)
+{
+	/*
+	 * It reads a bit odd to clear a session cache when we are destroying the
+	 * context altogether, but if the session cache isn't cleared before
+	 * shutting down the context it will fail with SEC_ERROR_BUSY.
+	 */
+	SSL_ClearSessionCache();
+}
+
+int
+be_tls_get_cipher_bits(Port *port)
+{
+	SECStatus			status;
+	SSLChannelInfo		channel;
+	SSLCipherSuiteInfo	suite;
+
+	status = SSL_GetChannelInfo(port->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+		goto error;
+
+	status = SSL_GetCipherSuiteInfo(channel.cipherSuite, &suite, sizeof(suite));
+	if (status != SECSuccess)
+		goto error;
+
+	return suite.effectiveKeyBits;
+
+error:
+	ereport(WARNING,
+			(errmsg("unable to extract TLS session information: %s",
+					pg_SSLerrmessage(PR_GetError()))));
+	return 0;
+}
+
+/*
+ * be_tls_get_compression
+ *
+ * NSS disabled support for TLS compression in version 3.33 and removed the
+ * code in a subsequent release. The API for retrieving information about
+ * compression as well as enabling it is kept for backwards compatibility, but
+ * we don't need to consult it since it was only available for SSLv3 which we
+ * don't support.
+ *
+ * https://bugzilla.mozilla.org/show_bug.cgi?id=1409587
+ */
+bool
+be_tls_get_compression(Port *port)
+{
+	return false;
+}
+
+const char *
+be_tls_get_version(Port *port)
+{
+	SECStatus			status;
+	SSLChannelInfo		channel;
+
+	status = SSL_GetChannelInfo(port->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+	{
+		ereport(WARNING,
+				(errmsg("unable to extract TLS session information: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+		return NULL;
+	}
+
+	return ssl_protocol_version_to_string(channel.protocolVersion);
+}
+
+const char *
+be_tls_get_cipher(Port *port)
+{
+	SECStatus			status;
+	SSLChannelInfo		channel;
+	SSLCipherSuiteInfo	suite;
+
+	status = SSL_GetChannelInfo(port->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+		goto error;
+
+	status = SSL_GetCipherSuiteInfo(channel.cipherSuite, &suite, sizeof(suite));
+	if (status != SECSuccess)
+		goto error;
+
+	return suite.cipherSuiteName;
+
+error:
+	ereport(WARNING,
+			(errmsg("unable to extract TLS session information: %s",
+					pg_SSLerrmessage(PR_GetError()))));
+	return NULL;
+}
+
+void
+be_tls_get_peer_subject_name(Port *port, char *ptr, size_t len)
+{
+	CERTCertificate	   *certificate;
+
+	certificate = SSL_PeerCertificate(port->pr_fd);
+	if (certificate)
+		strlcpy(ptr, CERT_NameToAscii(&certificate->subject), len);
+	else
+		ptr[0] = '\0';
+}
+
+void
+be_tls_get_peer_issuer_name(Port *port, char *ptr, size_t len)
+{
+	CERTCertificate	    *certificate;
+
+	certificate = SSL_PeerCertificate(port->pr_fd);
+	if (certificate)
+		strlcpy(ptr, CERT_NameToAscii(&certificate->issuer), len);
+	else
+		ptr[0] = '\0';
+}
+
+void
+be_tls_get_peer_serial(Port *port, char *ptr, size_t len)
+{
+	CERTCertificate	   *certificate;
+
+	certificate = SSL_PeerCertificate(port->pr_fd);
+	if (certificate)
+		snprintf(ptr, len, "%li", DER_GetInteger(&(certificate->serialNumber)));
+	else
+		ptr[0] = '\0';
+}
+
+static SECStatus
+pg_bad_cert_handler(void *arg, PRFileDesc *fd)
+{
+	Port			   *port = (Port *) arg;
+
+	port->peer_cert_valid = false;
+	return SECFailure;
+}
+
+static SECStatus
+pg_cert_auth_handler(void *arg, PRFileDesc *fd, PRBool checksig, PRBool isServer)
+{
+	SECStatus			status;
+	Port			   *port = (Port *) arg;
+	CERTCertificate	   *cert;
+	char			   *peer_cn;
+	int					len;
+
+	status = SSL_AuthCertificate(CERT_GetDefaultCertDB(), port->pr_fd, checksig, PR_TRUE);
+	if (status == SECSuccess)
+	{
+		cert = SSL_PeerCertificate(port->pr_fd);
+		len = strlen(cert->subjectName);
+		peer_cn = MemoryContextAllocZero(TopMemoryContext, len + 1);
+		if (strncmp(cert->subjectName, "CN=", 3) == 0)
+			strlcpy(peer_cn, cert->subjectName + strlen("CN="), len + 1);
+		else
+			strlcpy(peer_cn, cert->subjectName, len + 1);
+		CERT_DestroyCertificate(cert);
+
+		port->peer_cn = peer_cn;
+		port->peer_cert_valid = true;
+	}
+
+	return status;
+}
+
+/* ------------------------------------------------------------ */
+/*						Internal functions						*/
+/* ------------------------------------------------------------ */
+
+static PRInt32
+pg_ssl_read(PRFileDesc *fd, void *buf, PRInt32 amount, PRIntn flags,
+			PRIntervalTime timeout)
+{
+	PRRecvFN		read_fn;
+	PRInt32			n_read;
+
+	read_fn = fd->lower->methods->recv;
+	n_read = read_fn(fd->lower, buf, amount, flags, timeout);
+
+	return n_read;
+}
+
+static PRInt32
+pg_ssl_write(PRFileDesc *fd, const void *buf, PRInt32 amount, PRIntn flags,
+			 PRIntervalTime timeout)
+{
+	PRSendFN		send_fn;
+	PRInt32			n_write;
+
+	send_fn = fd->lower->methods->send;
+	n_write = send_fn(fd->lower, buf, amount, flags, timeout);
+
+	return n_write;
+}
+
+static PRFileDesc *
+init_iolayer(Port *port, int loglevel)
+{
+	const PRIOMethods	   *default_methods;
+	PRFileDesc			   *layer;
+
+	/*
+	 * Start by initializing our layer with all the default methods so that
+	 * we can selectively override the ones we want while still ensuring that
+	 * we have a complete layer specification.
+	 */
+	default_methods = PR_GetDefaultIOMethods();
+	memcpy(&pr_iomethods, default_methods, sizeof(PRIOMethods));
+
+	pr_iomethods.recv = pg_ssl_read;
+	pr_iomethods.send = pg_ssl_write;
+
+	/*
+	 * Each IO layer must be identified by a unique name, where uniqueness is
+	 * per connection. Each connection in a postgres cluster can generate the
+	 * identity from the same string as they will create their IO layers on
+	 * different sockets. Only one layer per socket can have the same name.
+	 */
+	pr_id = PR_GetUniqueIdentity("PostgreSQL");
+	if (pr_id == PR_INVALID_IO_LAYER)
+	{
+		ereport(loglevel,
+				(errmsg("out of memory when setting up TLS connection")));
+		return NULL;
+	}
+
+	/*
+	 * Create the actual IO layer as a stub such that it can be pushed onto
+	 * the layer stack. The step via a stub is required as we define custom
+	 * callbacks.
+	 */
+	layer = PR_CreateIOLayerStub(pr_id, &pr_iomethods);
+	if (!layer)
+	{
+		ereport(loglevel,
+				(errmsg("unable to create NSS I/O layer")));
+		return NULL;
+	}
+
+	return layer;
+}
+
+static char *
+ssl_protocol_version_to_string(int v)
+{
+	switch(v)
+	{
+		/* SSL v2 and v3 are not supported */
+		case SSL_LIBRARY_VERSION_2:
+		case SSL_LIBRARY_VERSION_3_0:
+			Assert(false);
+			break;
+
+		case SSL_LIBRARY_VERSION_TLS_1_0:
+			return pstrdup("TLSv1.0");
+		case SSL_LIBRARY_VERSION_TLS_1_1:
+			return pstrdup("TLSv1.1");
+		case SSL_LIBRARY_VERSION_TLS_1_2:
+			return pstrdup("TLSv1.2");
+		case SSL_LIBRARY_VERSION_TLS_1_3:
+			return pstrdup("TLSv1.3");
+	}
+
+	return pstrdup("unknown");
+}
+
+
+/*
+ * ssl_protocol_version_to_nss
+ *			Translate PostgreSQL TLS version to NSS version
+ *
+ * Returns zero in case the requested TLS version is undefined (PG_ANY) and
+ * should be set by the caller, or -1 on failure.
+ */
+static uint16
+ssl_protocol_version_to_nss(int v, const char *guc_name)
+{
+	switch(v)
+	{
+		/*
+		 * There is no SSL_LIBRARY_ macro defined in NSS with the value zero,
+		 * so we use this to signal the caller that the highest useful version
+		 * should be set on the connection.
+		 */
+		case PG_TLS_ANY:
+			return 0;
+		/*
+		 * No guard is required here as there are no versions of NSS without
+		 * support for TLS1.
+		 */
+		case PG_TLS1_VERSION:
+			return SSL_LIBRARY_VERSION_TLS_1_0;
+		case PG_TLS1_1_VERSION:
+#ifdef SSL_LIBRARY_VERSION_TLS_1_1
+			return SSL_LIBRARY_VERSION_TLS_1_1;
+#else
+			break;
+#endif
+		case PG_TLS1_2_VERSION:
+#ifdef SSL_LIBRARY_VERSION_TLS_1_2
+			return SSL_LIBRARY_VERSION_TLS_1_2;
+#else
+			break;
+#endif
+		case PG_TLS1_3_VERSION:
+#ifdef SSL_LIBRARY_VERSION_TLS_1_3
+			return SSL_LIBRARY_VERSION_TLS_1_3;
+#else
+			break;
+#endif
+		default:
+			break;
+	}
+
+	return -1;
+}
+
+/*
+ * pg_SSLerrmessage
+ *		Create and return a human readable error message given
+ *		the specified error code
+ *
+ * PR_ErrorToName only converts the enum identifier of the error to string,
+ * but that can be quite useful for debugging (and in case PR_ErrorToString is
+ * unable to render a message then we at least have something).
+ */
+static char *
+pg_SSLerrmessage(PRErrorCode errcode)
+{
+	char		error[128];
+	int			ret;
+
+	/* TODO: this should perhaps use a StringInfo instead.. */
+	ret = pg_snprintf(error, sizeof(error), "%s (%s)",
+					  PR_ErrorToString(errcode, PR_LANGUAGE_I_DEFAULT),
+					  PR_ErrorToName(errcode));
+	if (ret)
+		return pstrdup(error);
+
+	return pstrdup(_("unknown TLS error"));
+}
diff --git a/src/backend/libpq/be-secure.c b/src/backend/libpq/be-secure.c
index 2ae507a902..f39977b80c 100644
--- a/src/backend/libpq/be-secure.c
+++ b/src/backend/libpq/be-secure.c
@@ -49,6 +49,9 @@ bool		ssl_passphrase_command_supports_reload;
 #ifdef USE_SSL
 bool		ssl_loaded_verify_locations = false;
 #endif
+#ifdef USE_NSS
+char	   *ssl_database;
+#endif
 
 /* GUC variable controlling SSL cipher list */
 char	   *SSLCipherSuites = NULL;
diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c
index 75fc6f11d6..6153745f07 100644
--- a/src/backend/utils/misc/guc.c
+++ b/src/backend/utils/misc/guc.c
@@ -4233,7 +4233,11 @@ static struct config_string ConfigureNamesString[] =
 		},
 		&ssl_library,
 #ifdef USE_SSL
+#if defined(USE_OPENSSL)
 		"OpenSSL",
+#elif defined(USE_NSS)
+		"NSS",
+#endif
 #else
 		"",
 #endif
@@ -4291,6 +4295,18 @@ static struct config_string ConfigureNamesString[] =
 		check_canonical_path, assign_pgstat_temp_directory, NULL
 	},
 
+#ifdef USE_NSS
+	{
+		{"ssl_database", PGC_SIGHUP, CONN_AUTH_SSL,
+			gettext_noop("Location of the NSS certificate database."),
+			NULL
+		},
+		&ssl_database,
+		"",
+		NULL, NULL, NULL
+	},
+#endif
+
 	{
 		{"synchronous_standby_names", PGC_SIGHUP, REPLICATION_MASTER,
 			gettext_noop("Number of synchronous standbys and list of names of potential synchronous ones."),
@@ -4319,8 +4335,10 @@ static struct config_string ConfigureNamesString[] =
 			GUC_SUPERUSER_ONLY
 		},
 		&SSLCipherSuites,
-#ifdef USE_OPENSSL
+#if defined(USE_OPENSSL)
 		"HIGH:MEDIUM:+3DES:!aNULL",
+#elif defined (USE_NSS)
+		"",
 #else
 		"none",
 #endif
diff --git a/src/include/common/pg_nss.h b/src/include/common/pg_nss.h
new file mode 100644
index 0000000000..38249314d5
--- /dev/null
+++ b/src/include/common/pg_nss.h
@@ -0,0 +1,141 @@
+/*-------------------------------------------------------------------------
+ *
+ * pg_nss.h
+ *	  Support for NSS as a TLS backend
+ *
+ * These definitions are used by both frontend and backend code.
+ *
+ * Copyright (c) 2020, PostgreSQL Global Development Group
+ *
+ * IDENTIFICATION
+ *        src/include/common/pg_nss.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef PG_NSS_H
+#define PG_NSS_H
+
+#ifdef USE_NSS
+
+#include <sslproto.h>
+
+PRUint16 pg_find_cipher(char *name);
+
+typedef struct
+{
+	const char     *name;
+	PRUint16        number;
+} NSSCiphers;
+
+#define INVALID_CIPHER	0xFFFF
+
+/*
+ * This list is a partial copy of the ciphers in NSS files lib/ssl/sslproto.h
+ * in order to provide a human readable version of the ciphers. It would be
+ * nice to not have to have this, but NSS doesn't provide any API addressing
+ * the ciphers by name. TODO: do we want more of the ciphers, or perhaps less?
+ */
+static const NSSCiphers NSS_CipherList[] = {
+
+	{"TLS_NULL_WITH_NULL_NULL", TLS_NULL_WITH_NULL_NULL},
+
+	{"TLS_RSA_WITH_NULL_MD5", TLS_RSA_WITH_NULL_MD5},
+	{"TLS_RSA_WITH_NULL_SHA", TLS_RSA_WITH_NULL_SHA},
+	{"TLS_RSA_WITH_RC4_128_MD5", TLS_RSA_WITH_RC4_128_MD5},
+	{"TLS_RSA_WITH_RC4_128_SHA", TLS_RSA_WITH_RC4_128_SHA},
+	{"TLS_RSA_WITH_IDEA_CBC_SHA", TLS_RSA_WITH_IDEA_CBC_SHA},
+	{"TLS_RSA_WITH_DES_CBC_SHA", TLS_RSA_WITH_DES_CBC_SHA},
+	{"TLS_RSA_WITH_3DES_EDE_CBC_SHA", TLS_RSA_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_DH_DSS_WITH_DES_CBC_SHA", TLS_DH_DSS_WITH_DES_CBC_SHA},
+	{"TLS_DH_DSS_WITH_3DES_EDE_CBC_SHA", TLS_DH_DSS_WITH_3DES_EDE_CBC_SHA},
+	{"TLS_DH_RSA_WITH_DES_CBC_SHA", TLS_DH_RSA_WITH_DES_CBC_SHA},
+	{"TLS_DH_RSA_WITH_3DES_EDE_CBC_SHA", TLS_DH_RSA_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_DHE_DSS_WITH_DES_CBC_SHA", TLS_DHE_DSS_WITH_DES_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_3DES_EDE_CBC_SHA", TLS_DHE_DSS_WITH_3DES_EDE_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_DES_CBC_SHA", TLS_DHE_RSA_WITH_DES_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA", TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_DH_anon_WITH_RC4_128_MD5", TLS_DH_anon_WITH_RC4_128_MD5},
+	{"TLS_DH_anon_WITH_DES_CBC_SHA", TLS_DH_anon_WITH_DES_CBC_SHA},
+	{"TLS_DH_anon_WITH_3DES_EDE_CBC_SHA", TLS_DH_anon_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_RSA_WITH_AES_128_CBC_SHA", TLS_RSA_WITH_AES_128_CBC_SHA},
+	{"TLS_DH_DSS_WITH_AES_128_CBC_SHA", TLS_DH_DSS_WITH_AES_128_CBC_SHA},
+	{"TLS_DH_RSA_WITH_AES_128_CBC_SHA", TLS_DH_RSA_WITH_AES_128_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_AES_128_CBC_SHA", TLS_DHE_DSS_WITH_AES_128_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_AES_128_CBC_SHA", TLS_DHE_RSA_WITH_AES_128_CBC_SHA},
+	{"TLS_DH_anon_WITH_AES_128_CBC_SHA", TLS_DH_anon_WITH_AES_128_CBC_SHA},
+
+	{"TLS_RSA_WITH_AES_256_CBC_SHA", TLS_RSA_WITH_AES_256_CBC_SHA},
+	{"TLS_DH_DSS_WITH_AES_256_CBC_SHA", TLS_DH_DSS_WITH_AES_256_CBC_SHA},
+	{"TLS_DH_RSA_WITH_AES_256_CBC_SHA", TLS_DH_RSA_WITH_AES_256_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_AES_256_CBC_SHA", TLS_DHE_DSS_WITH_AES_256_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_AES_256_CBC_SHA", TLS_DHE_RSA_WITH_AES_256_CBC_SHA},
+	{"TLS_DH_anon_WITH_AES_256_CBC_SHA", TLS_DH_anon_WITH_AES_256_CBC_SHA},
+	{"TLS_RSA_WITH_NULL_SHA256", TLS_RSA_WITH_NULL_SHA256},
+	{"TLS_RSA_WITH_AES_128_CBC_SHA256", TLS_RSA_WITH_AES_128_CBC_SHA256},
+	{"TLS_RSA_WITH_AES_256_CBC_SHA256", TLS_RSA_WITH_AES_256_CBC_SHA256},
+
+	{"TLS_DHE_DSS_WITH_AES_128_CBC_SHA256", TLS_DHE_DSS_WITH_AES_128_CBC_SHA256},
+	{"TLS_RSA_WITH_CAMELLIA_128_CBC_SHA", TLS_RSA_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DH_DSS_WITH_CAMELLIA_128_CBC_SHA", TLS_DH_DSS_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DH_RSA_WITH_CAMELLIA_128_CBC_SHA", TLS_DH_RSA_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_CAMELLIA_128_CBC_SHA", TLS_DHE_DSS_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA", TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DH_anon_WITH_CAMELLIA_128_CBC_SHA", TLS_DH_anon_WITH_CAMELLIA_128_CBC_SHA},
+
+	{"TLS_DHE_DSS_WITH_RC4_128_SHA", TLS_DHE_DSS_WITH_RC4_128_SHA},
+	{"TLS_DHE_RSA_WITH_AES_128_CBC_SHA256", TLS_DHE_RSA_WITH_AES_128_CBC_SHA256},
+	{"TLS_DHE_DSS_WITH_AES_256_CBC_SHA256", TLS_DHE_DSS_WITH_AES_256_CBC_SHA256},
+	{"TLS_DHE_RSA_WITH_AES_256_CBC_SHA256", TLS_DHE_RSA_WITH_AES_256_CBC_SHA256},
+
+	{"TLS_RSA_WITH_CAMELLIA_256_CBC_SHA", TLS_RSA_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DH_DSS_WITH_CAMELLIA_256_CBC_SHA", TLS_DH_DSS_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DH_RSA_WITH_CAMELLIA_256_CBC_SHA", TLS_DH_RSA_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_CAMELLIA_256_CBC_SHA", TLS_DHE_DSS_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA", TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DH_anon_WITH_CAMELLIA_256_CBC_SHA", TLS_DH_anon_WITH_CAMELLIA_256_CBC_SHA},
+
+	{"TLS_RSA_WITH_SEED_CBC_SHA", TLS_RSA_WITH_SEED_CBC_SHA},
+
+	{"TLS_RSA_WITH_AES_128_GCM_SHA256", TLS_RSA_WITH_AES_128_GCM_SHA256},
+	{"TLS_RSA_WITH_AES_256_GCM_SHA384", TLS_RSA_WITH_AES_256_GCM_SHA384},
+	{"TLS_DHE_RSA_WITH_AES_128_GCM_SHA256", TLS_DHE_RSA_WITH_AES_128_GCM_SHA256},
+	{"TLS_DHE_RSA_WITH_AES_256_GCM_SHA384", TLS_DHE_RSA_WITH_AES_256_GCM_SHA384},
+	{"TLS_DHE_DSS_WITH_AES_128_GCM_SHA256", TLS_DHE_DSS_WITH_AES_128_GCM_SHA256},
+	{"TLS_DHE_DSS_WITH_AES_256_GCM_SHA384", TLS_DHE_DSS_WITH_AES_256_GCM_SHA384},
+
+	{"TLS_AES_128_GCM_SHA256", TLS_AES_128_GCM_SHA256},
+	{"TLS_AES_256_GCM_SHA384", TLS_AES_256_GCM_SHA384},
+	{"TLS_CHACHA20_POLY1305_SHA256", TLS_CHACHA20_POLY1305_SHA256},
+	{NULL, 0}
+};
+
+/*
+ * pg_find_cipher
+ *			Translate an NSS ciphername to the cipher code
+ *
+ * Searches the configured ciphers for the corresponding cipher code to the
+ * name. Search is performed case insensitive.
+ */
+PRUint16
+pg_find_cipher(char *name)
+{
+	const NSSCiphers	*cipher_list = NSS_CipherList;
+
+	while (cipher_list->name)
+	{
+		if (pg_strcasecmp(cipher_list->name, name) == 0)
+			return cipher_list->number;
+
+		cipher_list++;
+	}
+
+	return 0xFFFF;
+}
+
+#endif							/* USE_NSS */
+
+#endif							/* PG_NSS_H */
diff --git a/src/include/libpq/libpq-be.h b/src/include/libpq/libpq-be.h
index 179ebaa104..fc2f16d847 100644
--- a/src/include/libpq/libpq-be.h
+++ b/src/include/libpq/libpq-be.h
@@ -192,13 +192,18 @@ typedef struct Port
 	bool		peer_cert_valid;
 
 	/*
-	 * OpenSSL structures. (Keep these last so that the locations of other
-	 * fields are the same whether or not you build with OpenSSL.)
+	 * SSL backend specific structures. (Keep these last so that the locations
+	 * of other fields are the same whether or not you build with SSL enabled.)
 	 */
 #ifdef USE_OPENSSL
 	SSL		   *ssl;
 	X509	   *peer;
 #endif
+
+#ifdef USE_NSS
+	//void	   *ssl;
+	void	   *pr_fd;
+#endif
 } Port;
 
 #ifdef USE_SSL
diff --git a/src/include/libpq/libpq.h b/src/include/libpq/libpq.h
index b1152475ac..298d87ecae 100644
--- a/src/include/libpq/libpq.h
+++ b/src/include/libpq/libpq.h
@@ -88,6 +88,9 @@ extern PGDLLIMPORT bool ssl_passphrase_command_supports_reload;
 #ifdef USE_SSL
 extern bool ssl_loaded_verify_locations;
 #endif
+#ifdef USE_NSS
+extern char *ssl_database;
+#endif
 
 extern int	secure_initialize(bool isServerStart);
 extern bool secure_loaded_verify_locations(void);
diff --git a/src/include/pg_config.h.in b/src/include/pg_config.h.in
index c199cd46d2..dba1443758 100644
--- a/src/include/pg_config.h.in
+++ b/src/include/pg_config.h.in
@@ -889,6 +889,9 @@
 /* Define to 1 to build with PAM support. (--with-pam) */
 #undef USE_PAM
 
+/* Define to build with NSS support (--with-nss) */
+#undef USE_NSS
+
 /* Define to 1 to use software CRC-32C implementation (slicing-by-8). */
 #undef USE_SLICING_BY_8_CRC32C
 
diff --git a/src/include/pg_config_manual.h b/src/include/pg_config_manual.h
index 8f3ec6bde1..2a5b59b998 100644
--- a/src/include/pg_config_manual.h
+++ b/src/include/pg_config_manual.h
@@ -176,10 +176,9 @@
 
 /*
  * USE_SSL code should be compiled only when compiling with an SSL
- * implementation.  (Currently, only OpenSSL is supported, but we might add
- * more implementations in the future.)
+ * implementation.
  */
-#ifdef USE_OPENSSL
+#if defined(USE_OPENSSL) || defined(USE_NSS)
 #define USE_SSL
 #endif
 
diff --git a/src/interfaces/libpq/Makefile b/src/interfaces/libpq/Makefile
index d4919970f8..97821fb39b 100644
--- a/src/interfaces/libpq/Makefile
+++ b/src/interfaces/libpq/Makefile
@@ -57,6 +57,10 @@ OBJS += \
 	fe-secure-gssapi.o
 endif
 
+ifeq ($(with_nss), yes)
+OBJS += fe-secure-nss.o
+endif
+
 ifeq ($(PORTNAME), cygwin)
 override shlib = cyg$(NAME)$(DLSUFFIX)
 endif
diff --git a/src/interfaces/libpq/fe-connect.c b/src/interfaces/libpq/fe-connect.c
index 27c9bb46ee..8dd1eb9e5c 100644
--- a/src/interfaces/libpq/fe-connect.c
+++ b/src/interfaces/libpq/fe-connect.c
@@ -354,6 +354,12 @@ static const internalPQconninfoOption PQconninfoOptions[] = {
 		"Target-Session-Attrs", "", 11, /* sizeof("read-write") = 11 */
 	offsetof(struct pg_conn, target_session_attrs)},
 
+#if defined(USE_NSS)
+	{"cert_database", NULL, NULL, NULL,
+		"CertificateDatabase", "", 64,
+	offsetof(struct pg_conn, cert_database)},
+#endif
+
 	/* Terminating entry --- MUST BE LAST */
 	{NULL, NULL, NULL, NULL,
 	NULL, NULL, 0}
diff --git a/src/interfaces/libpq/fe-secure-nss.c b/src/interfaces/libpq/fe-secure-nss.c
new file mode 100644
index 0000000000..863c58f20b
--- /dev/null
+++ b/src/interfaces/libpq/fe-secure-nss.c
@@ -0,0 +1,959 @@
+/*-------------------------------------------------------------------------
+ *
+ * fe-secure-nss.c
+ *	  functions for supporting NSS as a TLS backend for frontend libpq
+ *
+ * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ *	  src/interfaces/libpq/fe-secure-nss.c
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#include "postgres_fe.h"
+
+#include "libpq-fe.h"
+#include "fe-auth.h"
+#include "libpq-int.h"
+
+/*
+ * BITS_PER_BYTE is also defined in the NSPR header fils, so we need to undef
+ * our version to avoid compiler warnings on redefinition.
+ */
+#define pg_BITS_PER_BYTE BITS_PER_BYTE
+#undef BITS_PER_BYTE
+
+/*
+ * The nspr/obsolete/protypes.h NSPR header typedefs uint64 and int64 with
+ * colliding definitions from ours, causing a much expected compiler error.
+ * The definitions are however not actually used in NSPR at all, and are only
+ * intended for what seems to be backwards compatibility for apps written
+ * against old versions of NSPR.  The following comment is in the referenced
+ * file, and was added in 1998:
+ *
+ *		This section typedefs the old 'native' types to the new PR<type>s.
+ *		These definitions are scheduled to be eliminated at the earliest
+ *		possible time. The NSPR API is implemented and documented using
+ *		the new definitions.
+ *
+ * As there is no opt-out from pulling in these typedefs, we define the guard
+ * for the file to exclude it. This is incredibly ugly, but seems to be about
+ * the only way around it.
+ */
+#define PROTYPES_H
+#include <nspr.h>
+#undef PROTYPES_H
+#include <nss.h>
+#include <ssl.h>
+#include <sslproto.h>
+#include <pk11func.h>
+#include <prerror.h>
+#include <prinit.h>
+#include <prio.h>
+#include <secerr.h>
+#include <secmod.h>
+
+/*
+ * Ensure that the colliding definitions match, else throw an error. In case
+ * NSPR remove the definition in a future version (however unlikely that may
+ * be, make sure to put ours back again.
+ */
+#if defined(BITS_PER_BYTE)
+#  if BITS_PER_BYTE != pg_BITS_PER_BYTE
+#    error "incompatible byte widths between NSPR and PostgreSQL"
+#  endif
+#else
+#  define BITS_PER_BYTE pg_BITS_PER_BYTE
+#endif
+#undef pg_BITS_PER_BYTE
+
+static SECStatus pg_load_nss_module(SECMODModule **module, const char *library, const char *name);
+static SECStatus pg_bad_cert_handler(void *arg, PRFileDesc *fd);
+static char *pg_SSLerrmessage(PRErrorCode errcode);
+static SECStatus pg_client_auth_handler(void *arg, PRFileDesc *socket, CERTDistNames *caNames,
+					CERTCertificate **pRetCert, SECKEYPrivateKey **pRetKey);
+static SECStatus pg_cert_auth_handler(void *arg, PRFileDesc *fd, PRBool checksig, PRBool isServer);
+static int ssl_protocol_version_to_nss(const char *protocol);
+static bool cert_database_has_CA(PGconn *conn);
+
+static char *PQssl_passwd_cb(PK11SlotInfo *slot, PRBool retry, void *arg);
+
+/*
+ * PR_ImportTCPSocket() is a private API, but very widely used, as it's the
+ * only way to make NSS use an already set up POSIX file descriptor rather
+ * than opening one itself. To quote the NSS documentation:
+ *
+ *		"In theory, code that uses PR_ImportTCPSocket may break when NSPR's
+ *		implementation changes. In practice, this is unlikely to happen because
+ *		NSPR's implementation has been stable for years and because of NSPR's
+ *		strong commitment to backward compatibility."
+ *
+ * https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSPR/Reference/PR_ImportTCPSocket
+ *
+ * The function is declared in <private/pprio.h>, but as it is a header marked
+ * private we declare it here rather than including it.
+ */
+NSPR_API(PRFileDesc*) PR_ImportTCPSocket(int);
+
+static SECMODModule *ca_trust = NULL;
+static NSSInitContext *nss_context = NULL;
+
+/*
+ * Track whether the NSS database has a password set or not. There is no API
+ * function for retrieving password status, so we simply flip this to true in
+ * case NSS invoked the password callback - as that will only happen in case
+ * there is a password. The reason for tracking this is that there are calls
+ * which require a password parameter, but doesn't use the callbacks provided,
+ * so we must call the callback on behalf of these.
+ */
+static bool has_password = false;
+
+#if defined(WIN32)
+static const char *ca_trust_name = "nssckbi.dll";
+#elif defined(__darwin__)
+static const char *ca_trust_name = "libnssckbi.dylib";
+#else
+static const char *ca_trust_name = "libnssckbi.so";
+#endif
+
+static PQsslKeyPassHook_type_nss PQsslKeyPassHook = NULL;
+
+/* ------------------------------------------------------------ */
+/*			 Procedures common to all secure sessions			*/
+/* ------------------------------------------------------------ */
+
+void
+pgtls_init_library(bool do_ssl, int do_crypto)
+{
+	/* TODO: implement me .. */
+}
+
+int
+pgtls_init(PGconn *conn)
+{
+	conn->ssl_in_use = false;
+
+	return 0;
+}
+
+void
+pgtls_close(PGconn *conn)
+{
+	if (nss_context)
+	{
+		NSS_ShutdownContext(nss_context);
+		nss_context = NULL;
+	}
+}
+
+PostgresPollingStatusType
+pgtls_open_client(PGconn *conn)
+{
+	SECStatus				status;
+	PRFileDesc			   *pr_fd;
+	PRFileDesc			   *model;
+	NSSInitParameters		params;
+	SSLVersionRange			desired_range;
+
+	/*
+	 * The NSPR documentation states that runtime initialization via PR_Init is
+	 * no longer required, as the first caller into NSPR will perform the
+	 * initialization implicitly. The documentation doesn't however clarify
+	 * from which version this is holds true, so let's perform the potentially
+	 * superfluous initialization anyways to avoid crashing on older versions
+	 * of NSPR, as there is no difference in overhead.  The NSS documentation
+	 * still states that PR_Init must be called in some way (implicitly or
+	 * explicitly).
+	 *
+	 * The below parameters are what the implicit initialization would've done
+	 * for us, and should work even for older versions where it might not be
+	 * done automatically. The last parameter, maxPTDs, is set to various
+	 * values in other codebases, but has been unused since NSPR 2.1 which was
+	 * released sometime in 1998.
+	 */
+	PR_Init(PR_USER_THREAD, PR_PRIORITY_NORMAL, 0);
+
+	/*
+	 * The original design of NSS was for a single application to use a single
+	 * copy of it, initialized with NSS_Initialize() which isn't returning any
+	 * handle with which to refer to NSS. NSS initialization and shutdown are
+	 * global for the application, so a shutdown in another NSS enabled library
+	 * would cause NSS to be stopped for libpq as well.  The fix has been to
+	 * introduce NSS_InitContext which returns a context handle to pass to
+	 * NSS_ShutdownContext.  NSS_InitContext was introduced in NSS 3.12, but
+	 * the use of it is not very well documented.
+	 * https://bugzilla.redhat.com/show_bug.cgi?id=738456
+	 *
+	 * The InitParameters struct passed can be used to override internal values
+	 * in NSS, but the usage is not documented at all. When using NSS_Init
+	 * initializations, the values are instead set via PK11_Configure calls so
+	 * the PK11_Configure documentation can be used to glean some details on
+	 * these.
+	 *
+	 * https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS/PKCS11/Module_Specs
+	 */
+	memset(&params, 0, sizeof(params));
+	params.length = sizeof(params);
+
+	if (conn->cert_database && strlen(conn->cert_database) > 0)
+	{
+		char *cert_database_path = psprintf("sql:%s", conn->cert_database);
+
+		nss_context = NSS_InitContext(cert_database_path, "", "", "",
+									  &params,
+									  NSS_INIT_READONLY | NSS_INIT_PK11RELOAD);
+		pfree(cert_database_path);
+	}
+	else
+		nss_context = NSS_InitContext("", "", "", "", &params,
+									  NSS_INIT_READONLY | NSS_INIT_NOCERTDB |
+									  NSS_INIT_NOMODDB | NSS_INIT_FORCEOPEN |
+									  NSS_INIT_NOROOTINIT | NSS_INIT_PK11RELOAD);
+
+	if (!nss_context)
+	{
+		char		*err = pg_SSLerrmessage(PR_GetError());
+
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to %s certificate database: %s"),
+										conn->cert_database ? "open" : "create",
+										err);
+		free(err);
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * Configure cipher policy.
+	 */
+	status = NSS_SetDomesticPolicy();
+	if (status != SECSuccess)
+	{
+		char		*err = pg_SSLerrmessage(PR_GetError());
+
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to configure cipher policy: %s"),
+										err);
+		free(err);
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * If we don't have a certificate database, the system trust store is the
+	 * fallback we can use. If we fail to initialize that as well, we can still
+	 * attempt a connection as long as the sslmode isn't verify*.
+	 */
+	if (!conn->cert_database && conn->sslmode[0] == 'v')
+	{
+		status = pg_load_nss_module(&ca_trust, ca_trust_name, "\"Root Certificates\"");
+		//status = pg_load_nss_module(&ca_trust, ca_trust_name, "trust");
+		if (status != SECSuccess)
+		{
+			char *err = pg_SSLerrmessage(PR_GetError());
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("WARNING: unable to load NSS trust module \"%s\" : %s"), ca_trust_name, err);
+			return PGRES_POLLING_FAILED;
+		}
+	}
+
+
+	PK11_SetPasswordFunc(PQssl_passwd_cb);
+
+	/*
+	 * Import the already opened socket as we don't want to use NSPR functions
+	 * for opening the network socket due to how the PostgreSQL protocol works
+	 * with TLS connections. This function is not part of the NSPR public API,
+	 * see the comment at the top of the file for the rationale of still using
+	 * it.
+	 */
+	pr_fd = PR_ImportTCPSocket(conn->sock);
+	if (!pr_fd)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to attach to socket: %s"),
+										pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * Most of the documentation available, and implementations of, NSS/NSPR
+	 * use the PR_NewTCPSocket() function here, which has the drawback that it
+	 * can only create IPv4 sockets. Instead use PR_OpenTCPSocket() which copes
+	 * with IPv6 as well.
+	 */
+	model = SSL_ImportFD(NULL, PR_OpenTCPSocket(conn->laddr.addr.ss_family));
+	if (!model)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to enable TLS: %s"),
+										pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/* Disable old protocol versions (SSLv2 and SSLv3) */
+	SSL_OptionSet(model, SSL_ENABLE_SSL2, PR_FALSE);
+	SSL_OptionSet(model, SSL_V2_COMPATIBLE_HELLO, PR_FALSE);
+	SSL_OptionSet(model, SSL_ENABLE_SSL3, PR_FALSE);
+
+#ifdef SSL_CBC_RANDOM_IV
+	/*
+	 * Enable protection against the BEAST attack in case the NSS library has
+	 * support for that. While SSLv3 is disabled, we may still allow TLSv1
+	 * which is affected. The option isn't documented as an SSL option, but as
+	 * an NSS environment variable.
+	 */
+	SSL_OptionSet(model, SSL_CBC_RANDOM_IV, PR_TRUE);
+#endif
+
+	/* Set us up as a TLS client for the handshake */
+	SSL_OptionSet(model, SSL_HANDSHAKE_AS_CLIENT, PR_TRUE);
+
+	/*
+	 * When setting the available protocols, we either use the user defined
+	 * configuration values, and if missing we accept whatever is the highest
+	 * version supported by the library as the max and only limit the range in
+	 * the other end at TLSv1.0. ssl_variant_stream is a ProtocolVariant enum
+	 * for Stream protocols, rather than datagram.
+	 */
+	SSL_VersionRangeGetSupported(ssl_variant_stream, &desired_range);
+	desired_range.min = SSL_LIBRARY_VERSION_TLS_1_0;
+
+	if (conn->ssl_min_protocol_version && strlen(conn->ssl_min_protocol_version) > 0)
+	{
+		int ssl_min_ver = ssl_protocol_version_to_nss(conn->ssl_min_protocol_version);
+
+		if (ssl_min_ver == -1)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("invalid value \"%s\" for minimum version of SSL protocol\n"),
+							  conn->ssl_min_protocol_version);
+			return -1;
+		}
+
+		desired_range.min = ssl_min_ver;
+	}
+
+	if (conn->ssl_max_protocol_version && strlen(conn->ssl_max_protocol_version) > 0)
+	{
+		int ssl_max_ver = ssl_protocol_version_to_nss(conn->ssl_max_protocol_version);
+
+		if (ssl_max_ver == -1)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("invalid value \"%s\" for maximum version of SSL protocol\n"),
+							  conn->ssl_max_protocol_version);
+			return -1;
+		}
+
+		desired_range.max = ssl_max_ver;
+	}
+
+	if (SSL_VersionRangeSet(model, &desired_range) != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to set allowed SSL protocol version range: %s"),
+										pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * Set up callback for verifying server certificates, as well as for how
+	 * to handle failed verifications.
+	 */
+	SSL_AuthCertificateHook(model, pg_cert_auth_handler, (void *) conn);
+	SSL_BadCertHook(model, pg_bad_cert_handler, (void *) conn);
+
+	/*
+	 * Convert the NSPR socket to an SSL socket. Ensuring the success of this
+	 * operation is critical as NSS SSL_* functions may return SECSuccess on
+	 * the socket even though SSL hasn't been enabled, which introduce a risk
+	 * of silent downgrades.
+	 */
+	conn->pr_fd = SSL_ImportFD(model, pr_fd);
+	if (!conn->pr_fd)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to configure client for TLS: %s"),
+										pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * The model can now we closed as we've applied the settings of the model
+	 * onto the real socket. From hereon we should only use conn->pr_fd.
+	 */
+	PR_Close(model);
+
+	/* Set the private data to be passed to the password callback */
+	SSL_SetPKCS11PinArg(conn->pr_fd, (void *) conn);
+
+	/*
+	 * If a CRL file has been specified, verify if it exists in the database
+	 * but don't fail in case it doesn't.
+	 */
+	if (conn->sslcrl && strlen(conn->sslcrl) > 0)
+	{
+		/* XXX: Implement me.. */
+	}
+
+	status = SSL_ResetHandshake(conn->pr_fd, PR_FALSE);
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to initiate handshake: %s"),
+										pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * Set callback for client authentication when requested by the server.
+	 */
+	SSL_GetClientAuthDataHook(conn->pr_fd, pg_client_auth_handler, (void *) conn);
+
+	/*
+	 * Specify which hostname we are expecting to talk to. This is required,
+	 * albeit mostly applies to when opening a connection to a traditional
+	 * http server it seems.
+	 */
+	SSL_SetURL(conn->pr_fd, (conn->connhost[conn->whichhost]).host);
+
+	do
+	{
+		status = SSL_ForceHandshake(conn->pr_fd);
+	}
+	while (status != SECSuccess && PR_GetError() == PR_WOULD_BLOCK_ERROR);
+
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("SSL error: %s"),
+										pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	conn->ssl_in_use = true;
+	return PGRES_POLLING_OK;
+}
+
+ssize_t
+pgtls_read(PGconn *conn, void *ptr, size_t len)
+{
+	PRInt32			nread;
+	PRErrorCode		status;
+	int				read_errno = 0;
+
+	nread = PR_Recv(conn->pr_fd, ptr, len, 0, PR_INTERVAL_NO_WAIT);
+
+	/*
+	 * PR_Recv blocks until there is data to read or the timeout expires. Zero
+	 * is returned for closed connections, while -1 indicates an error within
+	 * the ongoing connection.
+	 */
+	if (nread == 0)
+	{
+		read_errno = ECONNRESET;
+		return -1;
+	}
+
+	if (nread == -1)
+	{
+		status = PR_GetError();
+
+		switch(status)
+		{
+			case PR_WOULD_BLOCK_ERROR:
+				read_errno = EINTR;
+				break;
+
+			case PR_IO_TIMEOUT_ERROR:
+				break;
+			/*
+			 * The error cases for PR_Recv are not documented, but can be
+			 * reverse engineered from _MD_unix_map_default_error() in the
+			 * NSPR code, defined in pr/src/md/unix/unix_errors.c.
+			 */
+			default:
+				printfPQExpBuffer(&conn->errorMessage,
+								  libpq_gettext("TLS read error: %s"),
+												pg_SSLerrmessage(status));
+				break;
+		}
+	}
+
+	SOCK_ERRNO_SET(read_errno);
+	return (ssize_t) nread;
+}
+
+/*
+ * pgtls_read_pending
+ *		Check for the existence of data to be read.
+ *
+ * This is part of the PostgreSQL TLS backend API.
+ */
+bool
+pgtls_read_pending(PGconn *conn)
+{
+	unsigned char	c;
+	int				n;
+
+	/*
+	 * PR_Recv peeks into the stream with the timeount turned off, to see if
+	 * there is another byte to read off the wire. There is an NSS function
+	 * SSL_DataPending() which might seem like a better fit, but it will only
+	 * check already encrypted data in the SSL buffer, not still unencrypted
+	 * data, thus it doesn't guarantee that a subsequent call to
+	 * PR_Read/PR_Recv wont block.
+	 */
+	n = PR_Recv(conn->pr_fd, &c, 1, PR_MSG_PEEK, PR_INTERVAL_NO_WAIT);
+	return (n > 0);
+}
+
+ssize_t
+pgtls_write(PGconn *conn, const void *ptr, size_t len)
+{
+	PRInt32			n;
+	PRErrorCode		status;
+	int				write_errno = 0;
+
+	n = PR_Write(conn->pr_fd, ptr, len);
+
+	if (n < 0)
+	{
+		status = PR_GetError();
+
+		switch(status)
+		{
+			case PR_WOULD_BLOCK_ERROR:
+#ifdef EAGAIN
+				write_errno = EAGAIN;
+#else
+				write_errno = EINTR;
+#endif
+				break;
+
+			default:
+				printfPQExpBuffer(&conn->errorMessage,
+								  libpq_gettext("TLS write error: %s"),
+												pg_SSLerrmessage(status));
+				write_errno = ECONNRESET;
+				break;
+		}
+	}
+
+	SOCK_ERRNO_SET(write_errno);
+	return (ssize_t) n;
+}
+
+/* ------------------------------------------------------------ */
+/*			PostgreSQL specific TLS support functions			*/
+/* ------------------------------------------------------------ */
+
+/*
+ * TODO: this a 99% copy of the same function in the backend, make these share
+ * a single implementation instead.
+ */
+static char *
+pg_SSLerrmessage(PRErrorCode errcode)
+{
+	const char *error;
+
+	error = PR_ErrorToName(errcode);
+	if (error)
+		return strdup(error);
+
+	return strdup("unknown TLS error");
+}
+
+static SECStatus
+pg_load_nss_module(SECMODModule **module, const char *library, const char *name)
+{
+	SECMODModule   *mod;
+	char		   *modulespec;
+
+	modulespec = psprintf("library=\"%s\", name=\"%s\"", library, name);
+
+	/*
+	 * Attempt to load the specified module. The second parameter is "parent"
+	 * which should always be NULL for application code. The third parameter
+	 * defines if loading should recurse which is only applicable when loading
+	 * a module from within another module. This hierarchy would have to be
+	 * defined in the modulespec, and since we don't support anything but
+	 * directly addressed modules we should pass PR_FALSE.
+	 */
+	mod = SECMOD_LoadUserModule(modulespec, NULL, PR_FALSE);
+	pfree(modulespec);
+
+	if (mod && mod->loaded)
+	{
+		*module = mod;
+		return SECSuccess;
+	}
+
+	SECMOD_DestroyModule(mod);
+	return SECFailure;
+}
+
+/* ------------------------------------------------------------ */
+/*						NSS Callbacks							*/
+/* ------------------------------------------------------------ */
+
+/*
+ * pg_cert_auth_handler
+ *			Callback for authenticating server certificate
+ *
+ * This is pretty much the same procedure as the SSL_AuthCertificate function
+ * provided by NSS, with the difference being server hostname validation. With
+ * SSL_AuthCertificate there is no way to do verify-ca, it only does the -full
+ * flavor of our sslmodes, so we need our own implementation.
+ */
+static SECStatus
+pg_cert_auth_handler(void *arg, PRFileDesc *fd, PRBool checksig, PRBool isServer)
+{
+	SECStatus			status;
+	PGconn			   *conn = (PGconn *) arg;
+	char			   *server_hostname = NULL;
+	CERTCertificate	   *server_cert;
+	void			   *pin;
+
+	Assert(!isServer);
+
+	pin = SSL_RevealPinArg(conn->pr_fd);
+	server_cert = SSL_PeerCertificate(conn->pr_fd);
+
+	status = CERT_VerifyCertificateNow((CERTCertDBHandle *) CERT_GetDefaultCertDB(), server_cert,
+									   checksig, certificateUsageSSLServer,
+									   pin, NULL);
+
+	/*
+	 * If we've already failed validation then there is no point in also
+	 * performing the hostname check for verify-full.
+	 */
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to verify certificate: %s"),
+										pg_SSLerrmessage(PR_GetError()));
+		goto done;
+	}
+
+	if (strcmp(conn->sslmode, "verify-full") == 0)
+	{
+		server_hostname = SSL_RevealURL(conn->pr_fd);
+		if (!server_hostname || server_hostname[0] == '\0')
+			goto done;
+
+		/*
+		 * CERT_VerifyCertName will internally perform RFC 2818 SubjectAltName
+		 * verification.
+		 */
+		status = CERT_VerifyCertName(server_cert, server_hostname);
+		if (status != SECSuccess)
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("unable to verify server hostname: %s"),
+											pg_SSLerrmessage(PR_GetError()));
+
+	}
+
+done:
+	if (server_hostname)
+		PR_Free(server_hostname);
+
+	CERT_DestroyCertificate(server_cert);
+	return status;
+}
+
+/*
+ * pg_client_auth_handler
+ *		Callback for client certificate validation
+ *
+ * The client auth callback is not on by default in NSS, so we need to invoke
+ * it ourselves to ensure we can do cert authentication. A TODO is to support
+ * running without a specified sslcert parameter. By retrieving all the certs
+ * via nickname from the cert database and see if we find one which apply with
+ * NSS_CmpCertChainWCANames() and PK11_FindKeyByAnyCert() we could support
+ * just running with a ssl database specified.
+ *
+ * For now, we use the default client certificate validation which requires a
+ * defined nickname to identify the cert in the database.
+ */
+static SECStatus
+pg_client_auth_handler(void *arg, PRFileDesc *socket, CERTDistNames *caNames,
+					   CERTCertificate **pRetCert, SECKEYPrivateKey **pRetKey)
+{
+	PGconn		   *conn = (PGconn *) arg;
+
+	return NSS_GetClientAuthData(conn->sslcert, socket, caNames, pRetCert, pRetKey);
+}
+
+/*
+ * pg_bad_cert_handler
+ *		Callback for failed certificate validation
+ *
+ * The TLS handshake will call this function iff the server certificate failed
+ * validation. Depending on the sslmode, we allow the connection anyways.
+ */
+static SECStatus
+pg_bad_cert_handler(void *arg, PRFileDesc *fd)
+{
+	PGconn		   *conn = (PGconn *) arg;
+	PRErrorCode		err;
+
+	/*
+	 * This really shouldn't happen, as we've the the PGconn object as our
+	 * callback data, and at the callsite we know it will be populated. That
+	 * being said, the NSS code itself performs this check even when it should
+	 * not be required so let's use the same belts with our suspenders.
+	 */
+	if (!arg)
+		return SECFailure;
+
+	/*
+	 * For sslmodes other than verify-full and verify-ca we don't perform peer
+	 * validation, so return immediately.  sslmode require with a database
+	 * specified which contains a CA certificate will work like verify-ca to be
+	 * compatible with the OpenSSL implementation.
+	 */
+	if (strcmp(conn->sslmode, "require") == 0)
+	{
+		if (conn->cert_database && strlen(conn->cert_database) > 0 && cert_database_has_CA(conn))
+			return SECFailure;
+	}
+	if (conn->sslmode[0] == 'v')
+		return SECFailure;
+
+	err = PORT_GetError();
+
+	/*
+	 * TODO: these are relevant error codes that can occur in certificate
+	 * validation, figure out which we dont want for require/prefer etc.
+	 */
+	switch (err)
+	{
+		case SEC_ERROR_INVALID_AVA:
+		case SEC_ERROR_INVALID_TIME:
+		case SEC_ERROR_BAD_SIGNATURE:
+		case SEC_ERROR_EXPIRED_CERTIFICATE:
+		case SEC_ERROR_UNKNOWN_ISSUER:
+		case SEC_ERROR_UNTRUSTED_ISSUER:
+		case SEC_ERROR_UNTRUSTED_CERT:
+		case SEC_ERROR_CERT_VALID:
+		case SEC_ERROR_EXPIRED_ISSUER_CERTIFICATE:
+		case SEC_ERROR_CRL_EXPIRED:
+		case SEC_ERROR_CRL_BAD_SIGNATURE:
+		case SEC_ERROR_EXTENSION_VALUE_INVALID:
+		case SEC_ERROR_CA_CERT_INVALID:
+		case SEC_ERROR_CERT_USAGES_INVALID:
+		case SEC_ERROR_UNKNOWN_CRITICAL_EXTENSION:
+			return SECSuccess;
+			break;
+		default:
+			return SECFailure;
+			break;
+	}
+
+	/* Unreachable */
+	return SECSuccess;
+}
+
+/* ------------------------------------------------------------ */
+/*					SSL information functions					*/
+/* ------------------------------------------------------------ */
+
+void *
+PQgetssl(PGconn *conn)
+{
+	/*
+	 * Always return NULL as this is legacy and defined to be equal to
+	 * PQsslStruct(conn, "OpenSSL"); This should ideally trigger a logged
+	 * warning somewhere as it's nonsensical to run in a non-OpenSSL build,
+	 * but the color of said bikeshed hasn't yet been determined.
+	 */
+	return NULL;
+}
+
+void *
+PQsslStruct(PGconn *conn, const char *struct_name)
+{
+	if (!conn)
+		return NULL;
+
+	/*
+	 * Return the underlying PRFileDesc which can be used to access information
+	 * on the connection details. There is no SSL context per se.
+	 */
+	if (strcmp(struct_name, "NSS") == 0)
+		return conn->pr_fd;
+	return NULL;
+}
+
+const char *const *
+PQsslAttributeNames(PGconn *conn)
+{
+	static const char *const result[] = {
+		"library",
+		"cipher",
+		"protocol",
+		"key_bits",
+		"compression",
+		NULL
+	};
+
+	return result;
+}
+
+const char *
+PQsslAttribute(PGconn *conn, const char *attribute_name)
+{
+	SECStatus			status;
+	SSLChannelInfo		channel;
+	SSLCipherSuiteInfo	suite;
+
+	if (!conn || !conn->pr_fd)
+		return NULL;
+
+	if (strcmp(attribute_name, "library") == 0)
+		return "NSS";
+
+	status = SSL_GetChannelInfo(conn->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+		return NULL;
+
+	status = SSL_GetCipherSuiteInfo(channel.cipherSuite, &suite, sizeof(suite));
+	if (status != SECSuccess)
+		return NULL;
+
+	if (strcmp(attribute_name, "cipher") == 0)
+		return suite.cipherSuiteName;
+
+	if (strcmp(attribute_name, "key_bits") == 0)
+	{
+		static char key_bits_str[8];
+
+		snprintf(key_bits_str, sizeof(key_bits_str), "%i", suite.effectiveKeyBits);
+		return key_bits_str;
+	}
+
+	if (strcmp(attribute_name, "protocol") == 0)
+	{
+		switch(channel.protocolVersion)
+		{
+#ifdef SSL_LIBRARY_VERSION_TLS_1_3
+			case SSL_LIBRARY_VERSION_TLS_1_3:
+				return "TLSv1.3";
+#endif
+#ifdef SSL_LIBRARY_VERSION_TLS_1_2
+			case SSL_LIBRARY_VERSION_TLS_1_2:
+				return "TLSv1.2";
+#endif
+#ifdef SSL_LIBRARY_VERSION_TLS_1_1
+			case SSL_LIBRARY_VERSION_TLS_1_1:
+				return "TLSv1.1";
+#endif
+			case SSL_LIBRARY_VERSION_TLS_1_0:
+				return "TLSv1.0";
+			default:
+				return "unknown";
+		}
+	}
+
+	/*
+	 * NSS disabled support for compression in version 3.33, and it was only
+	 * available for SSLv3 at that point anyways, so we can safely return off
+	 * here without checking.
+	 */
+	if (strcmp(attribute_name, "compression") == 0)
+		return "off";
+
+	return NULL;
+}
+
+static int
+ssl_protocol_version_to_nss(const char *protocol)
+{
+	if (pg_strcasecmp("TLSv1", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_0;
+
+#ifdef SSL_LIBRARY_VERSION_TLS_1_1
+	if (pg_strcasecmp("TLSv1.1", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_1;
+#endif
+
+#ifdef SSL_LIBRARY_VERSION_TLS_1_2
+	if (pg_strcasecmp("TLSv1.2", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_2;
+#endif
+
+#ifdef SSL_LIBRARY_VERSION_TLS_1_3
+	if (pg_strcasecmp("TLSv1.3", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_3;
+#endif
+
+	return -1;
+}
+
+static bool
+cert_database_has_CA(PGconn *conn)
+{
+	CERTCertList	   *certificates;
+	bool				hasCA;
+
+	/*
+	 * If the certificate database has a password we must provide it, since
+	 * this API doesn't invoke the standard password callback.
+	 */
+	if (has_password)
+		certificates = PK11_ListCerts(PK11CertListCA, PQssl_passwd_cb(NULL, PR_FALSE, (void *) conn));
+	else
+		certificates = PK11_ListCerts(PK11CertListCA, NULL);
+	hasCA = !CERT_LIST_EMPTY(certificates);
+	CERT_DestroyCertList(certificates);
+
+	return hasCA;
+}
+
+PQsslKeyPassHook_type_nss
+PQgetSSLKeyPassHook_nss(void)
+{
+	return PQsslKeyPassHook;
+}
+
+void
+PQsetSSLKeyPassHook_nss(PQsslKeyPassHook_type_nss hook)
+{
+	PQsslKeyPassHook = hook;
+}
+
+/*
+ * Supply a password to decrypt a client certificate.
+ *
+ * This must match NSS type PK11PasswordFunc.
+ */
+static char *
+PQssl_passwd_cb(PK11SlotInfo *slot, PRBool retry, void *arg)
+{
+	has_password = true;
+
+	if (PQsslKeyPassHook)
+		return PQsslKeyPassHook(slot, (PRBool) retry, arg);
+	else
+		return PQdefaultSSLKeyPassHook_nss(slot, retry, arg);
+}
+
+/*
+ * The default password handler callback.
+ */
+char *
+PQdefaultSSLKeyPassHook_nss(PK11SlotInfo *slot, PRBool retry, void *arg)
+{
+	PGconn *conn = (PGconn *) arg;
+
+	/*
+	 * If the password didn't work the first time there is no point in retrying
+	 * as it hasn't changed.
+	 */
+	if (retry != PR_TRUE && conn->sslpassword && strlen(conn->sslpassword) > 0)
+		return PORT_Strdup(conn->sslpassword);
+
+	return NULL;
+}
diff --git a/src/interfaces/libpq/libpq-fe.h b/src/interfaces/libpq/libpq-fe.h
index 3b6a9fbce3..1fc7e43cfd 100644
--- a/src/interfaces/libpq/libpq-fe.h
+++ b/src/interfaces/libpq/libpq-fe.h
@@ -625,6 +625,17 @@ extern PQsslKeyPassHook_OpenSSL_type PQgetSSLKeyPassHook_OpenSSL(void);
 extern void PQsetSSLKeyPassHook_OpenSSL(PQsslKeyPassHook_OpenSSL_type hook);
 extern int	PQdefaultSSLKeyPassHook_OpenSSL(char *buf, int size, PGconn *conn);
 
+/* == in fe-secure-nss.c === */
+typedef struct PK11SlotInfoStr PK11SlotInfo;
+typedef int PRIntn;
+typedef PRIntn PRBool;
+
+/* Support for overriding sslpassword handling with a callback. */
+typedef char *(*PQsslKeyPassHook_type_nss)(PK11SlotInfo *slot, PRBool retry, void *arg);
+extern PQsslKeyPassHook_type_nss PQgetSSLKeyPassHook_nss(void);
+extern void PQsetSSLKeyPassHook_nss(PQsslKeyPassHook_type_nss hook);
+extern char *PQdefaultSSLKeyPassHook_nss(PK11SlotInfo *slot, PRBool retry, void *arg);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/src/interfaces/libpq/libpq-int.h b/src/interfaces/libpq/libpq-int.h
index 1de91ae295..53602dc1a6 100644
--- a/src/interfaces/libpq/libpq-int.h
+++ b/src/interfaces/libpq/libpq-int.h
@@ -485,6 +485,11 @@ struct pg_conn
 								 * OpenSSL version changes */
 #endif
 #endif							/* USE_OPENSSL */
+
+#ifdef USE_NSS
+	char	   *cert_database;
+	void	   *pr_fd;
+#endif							/* USE_NSS */
 #endif							/* USE_SSL */
 
 #ifdef ENABLE_GSS
diff --git a/src/test/ssl/Makefile b/src/test/ssl/Makefile
index 777ee39413..aa68b4175c 100644
--- a/src/test/ssl/Makefile
+++ b/src/test/ssl/Makefile
@@ -14,6 +14,7 @@ top_builddir = ../../..
 include $(top_builddir)/src/Makefile.global
 
 export with_openssl
+export with_nss
 
 CERTIFICATES := server_ca server-cn-and-alt-names \
 	server-cn-only server-single-alt-name server-multiple-alt-names \
@@ -30,6 +31,27 @@ SSLFILES := $(CERTIFICATES:%=ssl/%.key) $(CERTIFICATES:%=ssl/%.crt) \
 	ssl/client+client_ca.crt ssl/client-der.key \
 	ssl/client-encrypted-pem.key ssl/client-encrypted-der.key
 
+NSSFILES := ssl/nss/client_ca.crt.db \
+	ssl/nss/server_ca.crt.db \
+	ssl/nss/root+server_ca.crt.db \
+	ssl/nss/root+client_ca.crt.db \
+	ssl/nss/both-cas-1.crt.db \
+	ssl/nss/client.crt__client.key.db \
+	ssl/nss/client-revoked.crt__client-revoked.key.db \
+	ssl/nss/server-cn-only.crt__server-password.key.db \
+	ssl/nss/server-cn-only.crt__server-cn-only.key.db \
+	ssl/nss/root.crl.der \
+	ssl/nss/server.crl.der \
+	ssl/nss/client.crl.der \
+	ssl/nss/server-multiple-alt-names.crt__server-multiple-alt-names.key.db \
+	ssl/nss/server-single-alt-name.crt__server-single-alt-name.key.db \
+	ssl/nss/server-cn-and-alt-names.crt__server-cn-and-alt-names.key.db \
+	ssl/nss/server-no-names.crt__server-no-names.key.db \
+	ssl/nss/server-revoked.crt__server-revoked.key.db \
+	ssl/nss/root+client.crl.der \
+	ssl/nss/client+client_ca.crt__client.key.db \
+	ssl/nss/client.crt__client-encrypted-pem.key.db
+
 # This target re-generates all the key and certificate files. Usually we just
 # use the ones that are committed to the tree without rebuilding them.
 #
@@ -37,6 +59,9 @@ SSLFILES := $(CERTIFICATES:%=ssl/%.key) $(CERTIFICATES:%=ssl/%.crt) \
 #
 sslfiles: $(SSLFILES)
 
+# Generate NSS certificate databases corresponding to the OpenSSL certificates
+nssfiles: $(NSSFILES)
+
 # OpenSSL requires a directory to put all generated certificates in. We don't
 # use this for anything, but we need a location.
 ssl/new_certs_dir:
@@ -64,6 +89,11 @@ ssl/%_ca.crt: ssl/%_ca.key %_ca.config ssl/root_ca.crt ssl/new_certs_dir
 	rm ssl/temp_ca.crt ssl/temp_ca_signed.crt
 	echo "01" > ssl/$*_ca.srl
 
+ssl/nss/%_ca.crt.db: ssl/%_ca.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n $*_ca.crt -i ssl/$*_ca.crt -t "CT,C,C"
+
 # Server certificates, signed by server CA:
 ssl/server-%.crt: ssl/server-%.key ssl/server_ca.crt server-%.config
 	openssl req -new -key ssl/server-$*.key -out ssl/server-$*.csr -config server-$*.config
@@ -77,6 +107,74 @@ ssl/server-ss.crt: ssl/server-cn-only.key ssl/server-cn-only.crt server-cn-only.
 	openssl x509 -req -days 10000 -in ssl/server-ss.csr -signkey ssl/server-cn-only.key -out ssl/server-ss.crt  -extensions v3_req -extfile server-cn-only.config
 	rm ssl/server-ss.csr
 
+ssl/nss/server-cn-only.crt__server-password.key.db: ssl/server-cn-only.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n server-cn-only.crt__server-password.key -i ssl/server-cn-only.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-password.pfx -inkey ssl/server-password.key -in ssl/server-cn-only.crt -certfile ssl/server_ca.crt -passin 'pass:secret1' -passout pass:
+	pk12util -i ssl/nss/server-password.pfx -d $@ -W ''
+
+ssl/nss/server-cn-only.crt__server-cn-only.key.db: ssl/server-cn-only.crt ssl/server-cn-only.key
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n server-cn-only.crt__server-cn-only.key -i ssl/server-cn-only.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-cn-only.pfx -inkey ssl/server-cn-only.key -in ssl/server-cn-only.crt -certfile ssl/server_ca.crt -passout pass:
+	pk12util -i ssl/nss/server-cn-only.pfx -d $@ -W ''
+
+ssl/nss/server-multiple-alt-names.crt__server-multiple-alt-names.key.db: ssl/server-multiple-alt-names.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n server-multiple-alt-names.crt__server-multiple-alt-names.key -i ssl/server-multiple-alt-names.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-multiple-alt-names.pfx -inkey ssl/server-multiple-alt-names.key -in ssl/server-multiple-alt-names.crt -certfile ssl/server-multiple-alt-names.crt -passout pass:
+	pk12util -i ssl/nss/server-multiple-alt-names.pfx -d $@ -W ''
+
+ssl/nss/server-single-alt-name.crt__server-single-alt-name.key.db: ssl/server-single-alt-name.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n server-single-alt-name.crt__server-single-alt-name.key -i ssl/server-single-alt-name.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-single-alt-name.pfx -inkey ssl/server-single-alt-name.key -in ssl/server-single-alt-name.crt -certfile ssl/server-single-alt-name.crt -passout pass:
+	pk12util -i ssl/nss/server-single-alt-name.pfx -d $@ -W ''
+
+ssl/nss/server-cn-and-alt-names.crt__server-cn-and-alt-names.key.db: ssl/server-cn-and-alt-names.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n server-cn-and-alt-names.crt__server-cn-and-alt-names.key -i ssl/server-cn-and-alt-names.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-cn-and-alt-names.pfx -inkey ssl/server-cn-and-alt-names.key -in ssl/server-cn-and-alt-names.crt -certfile ssl/server-cn-and-alt-names.crt -passout pass:
+	pk12util -i ssl/nss/server-cn-and-alt-names.pfx -d $@ -W ''
+
+ssl/nss/server-no-names.crt__server-no-names.key.db: ssl/server-no-names.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n server-no-names.crt__server-no-names.key -i ssl/server-no-names.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-no-names.pfx -inkey ssl/server-no-names.key -in ssl/server-no-names.crt -certfile ssl/server-no-names.crt -passout pass:
+	pk12util -i ssl/nss/server-no-names.pfx -d $@ -W ''
+
+ssl/nss/server-revoked.crt__server-revoked.key.db: ssl/server-revoked.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n server-revoked.crt__server-revoked.key -i ssl/server-revoked.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-revoked.pfx -inkey ssl/server-revoked.key -in ssl/server-revoked.crt -certfile ssl/server-revoked.crt -passout pass:
+	pk12util -i ssl/nss/server-revoked.pfx -d $@ -W ''
+
 # Password-protected version of server-cn-only.key
 ssl/server-password.key: ssl/server-cn-only.key
 	openssl rsa -aes256 -in $< -out $@ -passout 'pass:secret1'
@@ -88,6 +186,27 @@ ssl/client.crt: ssl/client.key ssl/client_ca.crt
 	openssl x509 -in ssl/temp.crt -out ssl/client.crt # to keep just the PEM cert
 	rm ssl/client.csr ssl/temp.crt
 
+# Client certificate, signed by client CA
+ssl/nss/client.crt__client.key.db: ssl/client.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n client.crt__client.key -i ssl/client.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client.pfx -inkey ssl/client.key -in ssl/client.crt -certfile ssl/client_ca.crt -passout pass:
+	pk12util -i ssl/nss/client.pfx -d $@ -W ''
+
+# Client certificate with encrypted key, signed by client CA
+ssl/nss/client.crt__client-encrypted-pem.key.db: ssl/client.crt
+	$(MKDIR_P) $@
+	echo 'dUmmyP^#+' > $@.pass
+	certutil -d "sql:$@" -N -f $@.pass
+	certutil -d "sql:$@" -A -f $@.pass -n client.crt__client-encrypted-pem.key -i ssl/client.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -f $@.pass -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -f $@.pass -n root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client-encrypted-pem.pfx -inkey ssl/client-encrypted-pem.key -in ssl/client.crt -certfile ssl/client_ca.crt -passin pass:'dUmmyP^#+' -passout pass:'dUmmyP^#+'
+	pk12util -i ssl/nss/client-encrypted-pem.pfx -d $@ -W 'dUmmyP^#+' -k $@.pass
+
 # Another client certificate, signed by the client CA. This one is revoked.
 ssl/client-revoked.crt: ssl/client-revoked.key ssl/client_ca.crt client.config
 	openssl req -new -key ssl/client-revoked.key -out ssl/client-revoked.csr -config client.config
@@ -95,6 +214,14 @@ ssl/client-revoked.crt: ssl/client-revoked.key ssl/client_ca.crt client.config
 	openssl x509 -in ssl/temp.crt -out ssl/client-revoked.crt # to keep just the PEM cert
 	rm ssl/client-revoked.csr ssl/temp.crt
 
+ssl/nss/client-revoked.crt__client-revoked.key.db: ssl/client-revoked.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n client-revoked.crt__client-revoked.key -i ssl/client-revoked.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client-revoked.pfx -inkey ssl/client-revoked.key -in ssl/client-revoked.crt -certfile ssl/client_ca.crt -passout pass:
+	pk12util -i ssl/nss/client-revoked.pfx -d $@ -W ''
+
 # Convert the key to DER, to test our behaviour there too
 ssl/client-der.key: ssl/client.key
 	openssl rsa -in ssl/client.key -outform DER -out ssl/client-der.key
@@ -112,6 +239,13 @@ ssl/client-encrypted-der.key: ssl/client.key
 ssl/both-cas-1.crt: ssl/root_ca.crt ssl/client_ca.crt ssl/server_ca.crt
 	cat $^ > $@
 
+ssl/nss/both-cas-1.crt.db: ssl/root_ca.crt ssl/client_ca.crt ssl/server_ca.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+
 # The same, but the certs are in different order
 ssl/both-cas-2.crt: ssl/root_ca.crt ssl/server_ca.crt ssl/client_ca.crt
 	cat $^ > $@
@@ -127,19 +261,41 @@ ssl/root+client_ca.crt: ssl/root_ca.crt ssl/client_ca.crt
 ssl/client+client_ca.crt: ssl/client.crt ssl/client_ca.crt
 	cat $^ > $@
 
+# Client certificate, signed by client CA
+ssl/nss/client+client_ca.crt__client.key.db: ssl/client+client_ca.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n client+client_ca.crt__client.key -i ssl/client+client_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client.crt__client.key -i ssl/client.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client.pfx -inkey ssl/client.key -in ssl/client.crt -certfile ssl/client_ca.crt -passout pass:
+	pk12util -i ssl/nss/client.pfx -d $@ -W ''
+
 #### CRLs
 
 ssl/client.crl: ssl/client-revoked.crt
 	openssl ca -config cas.config -name client_ca -revoke ssl/client-revoked.crt
 	openssl ca -config cas.config -name client_ca -gencrl -out ssl/client.crl
 
+ssl/nss/client.crl.der: ssl/client.crl
+	openssl crl -in $^ -outform der -out $@
+
 ssl/server.crl: ssl/server-revoked.crt
 	openssl ca -config cas.config -name server_ca -revoke ssl/server-revoked.crt
 	openssl ca -config cas.config -name server_ca -gencrl -out ssl/server.crl
 
+ssl/nss/server.crl.der: ssl/server.crl
+	openssl crl -in $^ -outform der -out $@
+
 ssl/root.crl: ssl/root_ca.crt
 	openssl ca -config cas.config -name root_ca -gencrl -out ssl/root.crl
 
+ssl/nss/root.crl.der: ssl/root.crl
+	openssl crl -in $^ -outform der -out $@
+
+ssl/nss/root+client.crl.der: ssl/root+client.crl
+	openssl crl -in $^ -outform der -out $@
+
 # If a CRL is used, OpenSSL requires a CRL file for *all* the CAs in the
 # chain, even if some of them are empty.
 ssl/root+server.crl: ssl/root.crl ssl/server.crl
@@ -154,6 +310,7 @@ sslfiles-clean:
 clean distclean maintainer-clean:
 	rm -rf tmp_check
 	rm -rf ssl/*.old ssl/new_certs_dir ssl/client*_tmp.key
+	rm -rf ssl/nss
 
 # Doesn't depend on $(SSLFILES) because we don't rebuild them by default
 check:
diff --git a/src/test/ssl/t/001_ssltests.pl b/src/test/ssl/t/001_ssltests.pl
index c0680f39d6..dbbe94a645 100644
--- a/src/test/ssl/t/001_ssltests.pl
+++ b/src/test/ssl/t/001_ssltests.pl
@@ -4,15 +4,22 @@ use PostgresNode;
 use TestLib;
 use Test::More;
 
-use File::Copy;
-
 use FindBin;
 use lib $FindBin::RealBin;
 
-use SSLServer;
+use SSL::Server;
+
+my $openssl;
+my $nss;
 
 if ($ENV{with_openssl} eq 'yes')
 {
+	$openssl = 1;
+	plan tests => 93;
+}
+elsif ($ENV{with_nss} eq 'yes')
+{
+	$nss = 1;
 	plan tests => 93;
 }
 else
@@ -32,32 +39,6 @@ my $SERVERHOSTCIDR = '127.0.0.1/32';
 # Allocation of base connection string shared among multiple tests.
 my $common_connstr;
 
-# The client's private key must not be world-readable, so take a copy
-# of the key stored in the code tree and update its permissions.
-#
-# This changes ssl/client.key to ssl/client_tmp.key etc for the rest
-# of the tests.
-my @keys = (
-	"client",     "client-revoked",
-	"client-der", "client-encrypted-pem",
-	"client-encrypted-der");
-foreach my $key (@keys)
-{
-	copy("ssl/${key}.key", "ssl/${key}_tmp.key")
-	  or die
-	  "couldn't copy ssl/${key}.key to ssl/${key}_tmp.key for permissions change: $!";
-	chmod 0600, "ssl/${key}_tmp.key"
-	  or die "failed to change permissions on ssl/${key}_tmp.key: $!";
-}
-
-# Also make a copy of that explicitly world-readable.  We can't
-# necessarily rely on the file in the source tree having those
-# permissions.  Add it to @keys to include it in the final clean
-# up phase.
-copy("ssl/client.key", "ssl/client_wrongperms_tmp.key");
-chmod 0644, "ssl/client_wrongperms_tmp.key";
-push @keys, 'client_wrongperms';
-
 #### Set up the server.
 
 note "setting up data directory";
@@ -72,32 +53,27 @@ $node->start;
 
 # Run this before we lock down access below.
 my $result = $node->safe_psql('postgres', "SHOW ssl_library");
-is($result, 'OpenSSL', 'ssl_library parameter');
+is($result, SSL::Server::ssl_library(), 'ssl_library parameter');
 
 configure_test_server_for_ssl($node, $SERVERHOSTADDR, $SERVERHOSTCIDR,
 	'trust');
 
 note "testing password-protected keys";
 
-open my $sslconf, '>', $node->data_dir . "/sslconfig.conf";
-print $sslconf "ssl=on\n";
-print $sslconf "ssl_cert_file='server-cn-only.crt'\n";
-print $sslconf "ssl_key_file='server-password.key'\n";
-print $sslconf "ssl_passphrase_command='echo wrongpassword'\n";
-close $sslconf;
-
-command_fails(
-	[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
-	'restart fails with password-protected key file with wrong password');
-$node->_update_pid(0);
-
-open $sslconf, '>', $node->data_dir . "/sslconfig.conf";
-print $sslconf "ssl=on\n";
-print $sslconf "ssl_cert_file='server-cn-only.crt'\n";
-print $sslconf "ssl_key_file='server-password.key'\n";
-print $sslconf "ssl_passphrase_command='echo secret1'\n";
-close $sslconf;
+SKIP:
+{
+	skip "Certificate passphrases aren't checked on server restart in NSS", 1 if ($nss);
+
+	switch_server_cert($node, 'server-cn-only', 'root+client_ca', 'server-password',
+		'echo wrongpassword');
+	command_fails(
+		[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
+		'restart fails with password-protected key file with wrong password');
+	$node->_update_pid(0);
+}
 
+switch_server_cert($node, 'server-cn-only', 'root+client_ca', 'server-password',
+	'echo=secret1');
 command_ok(
 	[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
 	'restart succeeds with password-protected key file');
@@ -149,44 +125,44 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"sslrootcert=invalid sslmode=verify-ca",
-	qr/root certificate file "invalid" does not exist/,
+	qr/root certificate file "invalid" does not exist|could not connect to server/,
 	"connect without server root cert sslmode=verify-ca");
 test_connect_fails(
 	$common_connstr,
 	"sslrootcert=invalid sslmode=verify-full",
-	qr/root certificate file "invalid" does not exist/,
+	qr/root certificate file "invalid" does not exist|could not connect to server/,
 	"connect without server root cert sslmode=verify-full");
 
 # Try with wrong root cert, should fail. (We're using the client CA as the
 # root, but the server's key is signed by the server CA.)
 test_connect_fails($common_connstr,
-	"sslrootcert=ssl/client_ca.crt sslmode=require",
+	"sslrootcert=ssl/client_ca.crt sslmode=require cert_database=ssl/nss/client_ca.crt.db",
 	qr/SSL error/, "connect with wrong server root cert sslmode=require");
 test_connect_fails($common_connstr,
-	"sslrootcert=ssl/client_ca.crt sslmode=verify-ca",
+	"sslrootcert=ssl/client_ca.crt sslmode=verify-ca cert_database=ssl/nss/client_ca.crt.db",
 	qr/SSL error/, "connect with wrong server root cert sslmode=verify-ca");
 test_connect_fails($common_connstr,
-	"sslrootcert=ssl/client_ca.crt sslmode=verify-full",
+	"sslrootcert=ssl/client_ca.crt sslmode=verify-full cert_database=ssl/nss/client_ca.crt.db",
 	qr/SSL error/, "connect with wrong server root cert sslmode=verify-full");
 
 # Try with just the server CA's cert. This fails because the root file
 # must contain the whole chain up to the root CA.
 test_connect_fails($common_connstr,
-	"sslrootcert=ssl/server_ca.crt sslmode=verify-ca",
+	"sslrootcert=ssl/server_ca.crt sslmode=verify-ca cert_database=ssl/nss/server_ca.crt.db",
 	qr/SSL error/, "connect with server CA cert, without root CA");
 
 # And finally, with the correct root cert.
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require cert_database=ssl/nss/root+server_ca.crt.db",
 	"connect with correct server CA cert file sslmode=require");
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca cert_database=ssl/nss/root+server_ca.crt.db",
 	"connect with correct server CA cert file sslmode=verify-ca");
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-full",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db",
 	"connect with correct server CA cert file sslmode=verify-full");
 
 # Test with cert root file that contains two certificates. The client should
@@ -195,36 +171,42 @@ test_connect_ok(
 	$common_connstr,
 	"sslrootcert=ssl/both-cas-1.crt sslmode=verify-ca",
 	"cert root file that contains two certificates, order 1");
-test_connect_ok(
-	$common_connstr,
-	"sslrootcert=ssl/both-cas-2.crt sslmode=verify-ca",
-	"cert root file that contains two certificates, order 2");
 
+# How about import the both-file into a database?
+SKIP:
+{
+	skip "CA ordering is irrelevant in NSS databases ", 1 if ($nss);
+
+	test_connect_ok(
+		$common_connstr,
+		"sslrootcert=ssl/both-cas-2.crt sslmode=verify-ca",
+		"cert root file that contains two certificates, order 2");
+}
 # CRL tests
 
 # Invalid CRL filename is the same as no CRL, succeeds
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=invalid",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=invalid cert_database=ssl/nss/root+server_ca.crt.db",
 	"sslcrl option with invalid file name");
 
 # A CRL belonging to a different CA is not accepted, fails
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/client.crl",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/client.crl.der cert_database=ssl/nss/root+server_ca.crt.db",
 	qr/SSL error/,
 	"CRL belonging to a different CA");
 
 # With the correct CRL, succeeds (this cert is not revoked)
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/root+server.crl",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/root+server.crl.der cert_database=ssl/nss/root+server_ca.crt.db",
 	"CRL with a non-revoked cert");
 
 # Check that connecting with verify-full fails, when the hostname doesn't
 # match the hostname in the server's certificate.
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -237,14 +219,14 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"sslmode=verify-full host=wronghost.test",
-	qr/\Qserver certificate for "common-name.pg-ssltest.test" does not match host name "wronghost.test"\E/,
+	qr/SSL_ERROR_BAD_CERT_DOMAIN/,
 	"mismatch between host name and server certificate sslmode=verify-full");
 
 # Test Subject Alternative Names.
 switch_server_cert($node, 'server-multiple-alt-names');
 
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -262,12 +244,12 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"host=wronghost.alt-name.pg-ssltest.test",
-	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "wronghost.alt-name.pg-ssltest.test"\E/,
+	qr/SSL_ERROR_BAD_CERT_DOMAIN/,
 	"host name not matching with X.509 Subject Alternative Names");
 test_connect_fails(
 	$common_connstr,
 	"host=deep.subdomain.wildcard.pg-ssltest.test",
-	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E/,
+	qr/SSL_ERROR_BAD_CERT_DOMAIN/,
 	"host name not matching with X.509 Subject Alternative Names wildcard");
 
 # Test certificate with a single Subject Alternative Name. (this gives a
@@ -275,7 +257,7 @@ test_connect_fails(
 switch_server_cert($node, 'server-single-alt-name');
 
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -285,12 +267,12 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"host=wronghost.alt-name.pg-ssltest.test",
-	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "wronghost.alt-name.pg-ssltest.test"\E/,
+	qr/SSL_ERROR_BAD_CERT_DOMAIN/,
 	"host name not matching with a single X.509 Subject Alternative Name");
 test_connect_fails(
 	$common_connstr,
 	"host=deep.subdomain.wildcard.pg-ssltest.test",
-	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E/,
+	qr/SSL_ERROR_BAD_CERT_DOMAIN/,
 	"host name not matching with a single X.509 Subject Alternative Name wildcard"
 );
 
@@ -299,7 +281,7 @@ test_connect_fails(
 switch_server_cert($node, 'server-cn-and-alt-names');
 
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -312,14 +294,14 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"host=common-name.pg-ssltest.test",
-	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 1 other name) does not match host name "common-name.pg-ssltest.test"\E/,
+	qr/SSL_ERROR_BAD_CERT_DOMAIN/,
 	"certificate with both a CN and SANs ignores CN");
 
 # Finally, test a server certificate that has no CN or SANs. Of course, that's
 # not a very sensible certificate, but libpq should handle it gracefully.
 switch_server_cert($node, 'server-no-names');
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -328,7 +310,7 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"sslmode=verify-full host=common-name.pg-ssltest.test",
-	qr/could not get server's host name from server certificate/,
+	qr/could not get server's host name from server certificate|SSL_ERROR_BAD_CERT_DOMAIN/,
 	"server certificate without CN or SANs sslmode=verify-full");
 
 # Test that the CRL works
@@ -340,11 +322,11 @@ $common_connstr =
 # Without the CRL, succeeds. With it, fails.
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca cert_database=ssl/nss/root+server_ca.crt.db",
 	"connects without client-side CRL");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/root+server.crl",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/nss/server.crl.der cert_database=ssl/nss/root+server_ca.crt.db",
 	qr/SSL error/,
 	"does not connect with client-side CRL");
 
@@ -365,21 +347,21 @@ command_like(
 # Test min/max SSL protocol versions.
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.2",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.2 cert_database=ssl/nss/root+server_ca.crt.db",
 	"connection success with correct range of TLS protocol versions");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.1",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.1 cert_database=ssl/nss/root+server_ca.crt.db",
 	qr/invalid SSL protocol version range/,
 	"connection failure with incorrect range of TLS protocol versions");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=incorrect_tls",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=incorrect_tls cert_database=ssl/nss/root+server_ca.crt.db",
 	qr/invalid ssl_min_protocol_version value/,
 	"connection failure with an incorrect SSL protocol minimum bound");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_max_protocol_version=incorrect_tls",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_max_protocol_version=incorrect_tls cert_database=ssl/nss/root+server_ca.crt.db",
 	qr/invalid ssl_max_protocol_version value/,
 	"connection failure with an incorrect SSL protocol maximum bound");
 
@@ -390,7 +372,7 @@ test_connect_fails(
 note "running server tests";
 
 $common_connstr =
-  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR";
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client.crt__client.key.db";
 
 # no client cert
 test_connect_fails(
@@ -402,36 +384,47 @@ test_connect_fails(
 # correct client cert in unencrypted PEM
 test_connect_ok(
 	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client_tmp.key",
+	"user=ssltestuser sslcert=client.crt__client.key sslkey=ssl/client_tmp.key",
 	"certificate authorization succeeds with correct client cert in PEM format"
 );
 
+$common_connstr =
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR";
+
+SKIP:
+{
+	skip "NSS database not implemented in the Makefile", 1 if ($nss);
 # correct client cert in unencrypted DER
 test_connect_ok(
 	$common_connstr,
 	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-der_tmp.key",
 	"certificate authorization succeeds with correct client cert in DER format"
 );
+}
 
 # correct client cert in encrypted PEM
 test_connect_ok(
 	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='dUmmyP^#+'",
+	"user=ssltestuser sslcert=client.crt__client-encrypted-pem.key sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='dUmmyP^#+' cert_database=ssl/nss/client.crt__client-encrypted-pem.key.db",
 	"certificate authorization succeeds with correct client cert in encrypted PEM format"
 );
 
+SKIP:
+{
+	skip "NSS database not implemented in the Makefile", 1 if ($nss);
 # correct client cert in encrypted DER
 test_connect_ok(
 	$common_connstr,
 	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-der_tmp.key sslpassword='dUmmyP^#+'",
 	"certificate authorization succeeds with correct client cert in encrypted DER format"
 );
+}
 
 # correct client cert in encrypted PEM with wrong password
 test_connect_fails(
 	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='wrong'",
-	qr!\Qprivate key file "ssl/client-encrypted-pem_tmp.key": bad decrypt\E!,
+	"user=ssltestuser sslcert=client.crt__client-encrypted-pem.key sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='wrong' cert_database=ssl/nss/client.crt__client-encrypted-pem.key.db",
+	qr!connection requires a valid client certificate|\Qprivate key file "ssl/client-encrypted-pem_tmp.key": bad decrypt\E!,
 	"certificate authorization fails with correct client cert and wrong password in encrypted PEM format"
 );
 
@@ -471,18 +464,19 @@ command_like(
 		'-P',
 		'null=_null_',
 		'-d',
-		"$common_connstr user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client_tmp.key",
+		"$common_connstr user=ssltestuser sslcert=client.crt__client.key sslkey=ssl/client_tmp.key",
 		'-c',
 		"SELECT * FROM pg_stat_ssl WHERE pid = pg_backend_pid()"
 	],
 	qr{^pid,ssl,version,cipher,bits,compression,client_dn,client_serial,issuer_dn\r?\n
-				^\d+,t,TLSv[\d.]+,[\w-]+,\d+,f,/CN=ssltestuser,1,\Q/CN=Test CA for PostgreSQL SSL regression test client certs\E\r?$}mx,
+				^\d+,t,TLSv[\d.]+,[\w-]+,\d+,f,CN=ssltestuser,1,\QCN=Test CA for PostgreSQL SSL regression test client certs\E\r?$}mx,
 	'pg_stat_ssl with client certificate');
 
 # client key with wrong permissions
 SKIP:
 {
 	skip "Permissions check not enforced on Windows", 2 if ($windows_os);
+	skip "Key not on filesystem with NSS", 2 if ($nss);
 
 	test_connect_fails(
 		$common_connstr,
@@ -494,15 +488,18 @@ SKIP:
 # client cert belonging to another user
 test_connect_fails(
 	$common_connstr,
-	"user=anotheruser sslcert=ssl/client.crt sslkey=ssl/client_tmp.key",
-	qr/certificate authentication failed for user "anotheruser"/,
+	"user=anotheruser sslcert=client.crt__client.key sslkey=ssl/client_tmp.key",
+	qr/unable to verify certificate|certificate authentication failed for user "anotheruser"/,
 	"certificate authorization fails with client cert belonging to another user"
 );
 
+$common_connstr =
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client-revoked.crt__client-revoked.key.db";
+
 # revoked client cert
 test_connect_fails(
 	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client-revoked.crt sslkey=ssl/client-revoked_tmp.key",
+	"user=ssltestuser sslcert=client-revoked.crt__client-revoked.key sslkey=ssl/client-revoked_tmp.key",
 	qr/SSL error/,
 	"certificate authorization fails with revoked client cert");
 
@@ -510,17 +507,17 @@ test_connect_fails(
 # works, iff username matches Common Name
 # fails, iff username doesn't match Common Name.
 $common_connstr =
-  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=verifydb hostaddr=$SERVERHOSTADDR";
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=verifydb hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client.crt__client.key.db";
 
 test_connect_ok(
 	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client_tmp.key",
+	"user=ssltestuser sslcert=client.crt__client.key sslkey=ssl/client_tmp.key",
 	"auth_option clientcert=verify-full succeeds with matching username and Common Name"
 );
 
 test_connect_fails(
 	$common_connstr,
-	"user=anotheruser sslcert=ssl/client.crt sslkey=ssl/client_tmp.key",
+	"user=anotheruser sslcert=client.crt__client.key sslkey=ssl/client_tmp.key",
 	qr/FATAL/,
 	"auth_option clientcert=verify-full fails with mismatching username and Common Name"
 );
@@ -529,24 +526,22 @@ test_connect_fails(
 # works, when username doesn't match Common Name
 test_connect_ok(
 	$common_connstr,
-	"user=yetanotheruser sslcert=ssl/client.crt sslkey=ssl/client_tmp.key",
+	"user=yetanotheruser sslcert=client.crt__client.key sslkey=ssl/client_tmp.key",
 	"auth_option clientcert=verify-ca succeeds with mismatching username and Common Name"
 );
 
 # intermediate client_ca.crt is provided by client, and isn't in server's ssl_ca_file
 switch_server_cert($node, 'server-cn-only', 'root_ca');
 $common_connstr =
-  "user=ssltestuser dbname=certdb sslkey=ssl/client_tmp.key sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR";
+  "user=ssltestuser dbname=certdb sslkey=ssl/client_tmp.key sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client+client_ca.crt__client.key.db";
 
 test_connect_ok(
 	$common_connstr,
-	"sslmode=require sslcert=ssl/client+client_ca.crt",
+	"sslmode=require sslcert=client+client_ca.crt__client.key",
 	"intermediate client certificate is provided by client");
-test_connect_fails($common_connstr, "sslmode=require sslcert=ssl/client.crt",
-	qr/SSL error/, "intermediate client certificate is missing");
+test_connect_fails($common_connstr, "sslmode=require sslcert=client.crt__client.key",
+	qr/connection requires a valid client certificate|SSL error/, "intermediate client certificate is missing");
 
 # clean up
-foreach my $key (@keys)
-{
-	unlink("ssl/${key}_tmp.key");
-}
+
+SSL::Server::cleanup();
diff --git a/src/test/ssl/t/002_scram.pl b/src/test/ssl/t/002_scram.pl
index a1ab911988..d83bc8658b 100644
--- a/src/test/ssl/t/002_scram.pl
+++ b/src/test/ssl/t/002_scram.pl
@@ -11,11 +11,11 @@ use File::Copy;
 use FindBin;
 use lib $FindBin::RealBin;
 
-use SSLServer;
+use SSL::Server;
 
 if ($ENV{with_openssl} ne 'yes')
 {
-	plan skip_all => 'SSL not supported by this build';
+	plan skip_all => 'OpenSSL not supported by this build';
 }
 
 # This is the hostname used to connect to the server.
diff --git a/src/test/ssl/t/SSL/Backend/NSS.pm b/src/test/ssl/t/SSL/Backend/NSS.pm
new file mode 100644
index 0000000000..2b44831739
--- /dev/null
+++ b/src/test/ssl/t/SSL/Backend/NSS.pm
@@ -0,0 +1,65 @@
+package SSL::Backend::NSS;
+
+use strict;
+use warnings;
+use Exporter;
+
+our @ISA = qw(Exporter);
+our @EXPORT_OK = qw(get_new_nss_backend);
+
+sub new
+{
+	my ($class) = @_;
+
+	my $self = {
+		_library => 'NSS'
+	};
+
+	bless $self, $class;
+
+	return $self;
+}
+
+sub get_new_nss_backend
+{
+	my $class = 'SSL::Backend::NSS';
+
+	return $class->new();
+}
+
+sub init
+{
+	# Make sure the certificate databases are in place?
+}
+
+sub get_library
+{
+	my ($self) = @_;
+
+	return $self->{_library};
+}
+
+sub set_server_cert
+{
+	my $self     = $_[0];
+	my $certfile = $_[1];
+	my $cafile   = $_[2];
+	my $keyfile  = $_[3];
+
+	my $cert_nickname = $certfile . '.crt__' . $keyfile . '.key';
+	my $cert_database = $cert_nickname . '.db';
+
+	my $sslconf = "ssl_ca_file='$cafile.crt'\n" .
+		"ssl_cert_file='$cert_nickname'\n" .
+		"ssl_crl_file=''\n" .
+		"ssl_database='nss/$cert_database'\n";
+
+	return $sslconf;
+}
+
+sub cleanup
+{
+	# Something?
+}
+
+1;
diff --git a/src/test/ssl/t/SSL/Backend/OpenSSL.pm b/src/test/ssl/t/SSL/Backend/OpenSSL.pm
new file mode 100644
index 0000000000..3d53289196
--- /dev/null
+++ b/src/test/ssl/t/SSL/Backend/OpenSSL.pm
@@ -0,0 +1,102 @@
+package SSL::Backend::OpenSSL;
+
+use strict;
+use warnings;
+use Exporter;
+
+our @ISA = qw(Exporter);
+our @EXPORT_OK = qw(get_new_openssl_backend);
+
+our (@keys);
+
+INIT
+{
+	@keys = (
+		"client",     "client-revoked",
+		"client-der", "client-encrypted-pem",
+		"client-encrypted-der");
+}
+
+sub new
+{
+	my ($class) = @_;
+
+	my $self = {
+		_library => 'OpenSSL'
+	};
+
+	bless $self, $class;
+
+	return $self;
+}
+
+sub get_new_openssl_backend
+{
+	my $class = 'SSL::Backend::OpenSSL';
+
+	my $backend = $class->new();
+
+	return $backend;
+}
+
+sub init
+{
+	# The client's private key must not be world-readable, so take a copy
+	# of the key stored in the code tree and update its permissions.
+	#
+	# This changes ssl/client.key to ssl/client_tmp.key etc for the rest
+	# of the tests.
+	foreach my $key (@keys)
+	{
+		copy("ssl/${key}.key", "ssl/${key}_tmp.key")
+		  or die
+		  "couldn't copy ssl/${key}.key to ssl/${key}_tmp.key for permissions change: $!";
+		chmod 0600, "ssl/${key}_tmp.key"
+		  or die "failed to change permissions on ssl/${key}_tmp.key: $!";
+	}
+
+	# Also make a copy of that explicitly world-readable.  We can't
+	# necessarily rely on the file in the source tree having those
+	# permissions. Add it to @keys to include it in the final clean
+	# up phase.
+	copy("ssl/client.key", "ssl/client_wrongperms_tmp.key")
+	  or die
+	  "couldn't copy ssl/client.key to ssl/client_wrongperms_tmp.key: $!";
+	chmod 0644, "ssl/client_wrongperms_tmp.key"
+	  or die "failed to change permissions on ssl/client_wrongperms_tmp.key: $!";
+	push @keys, 'client_wrongperms';
+}
+
+# Change the configuration to use given server cert file, and reload
+# the server so that the configuration takes effect.
+sub set_server_cert
+{
+	my $self     = $_[0];
+	my $certfile = $_[1];
+	my $cafile   = $_[2] || "root+client_ca";
+	my $keyfile  = $_[3] || $certfile;
+
+	my $sslconf = "ssl_ca_file='$cafile.crt'\n" .
+		"ssl_cert_file='$certfile.crt'\n" .
+		"ssl_key_file='$keyfile.key'\n" .
+		"ssl_crl_file='root+client.crl'\n";
+
+	return $sslconf;
+}
+
+sub get_library
+{
+	my ($self) = @_;
+
+	return $self->{_library};
+}
+
+sub cleanup
+{
+	foreach my $key (@keys)
+	{
+		unlink("ssl/${key}_tmp.key");
+	}
+}
+
+1;
diff --git a/src/test/ssl/t/SSLServer.pm b/src/test/ssl/t/SSL/Server.pm
similarity index 82%
rename from src/test/ssl/t/SSLServer.pm
rename to src/test/ssl/t/SSL/Server.pm
index 1e392b8fbf..8e970833b5 100644
--- a/src/test/ssl/t/SSLServer.pm
+++ b/src/test/ssl/t/SSL/Server.pm
@@ -24,15 +24,34 @@
 # explicitly because an invalid sslcert or sslrootcert, respectively,
 # causes those to be ignored.)
 
-package SSLServer;
+package SSL::Server;
 
 use strict;
 use warnings;
 use PostgresNode;
+use RecursiveCopy;
 use TestLib;
 use File::Basename;
 use File::Copy;
 use Test::More;
+use SSL::Backend::OpenSSL qw(get_new_openssl_backend);
+use SSL::Backend::NSS qw(get_new_nss_backend);
+
+our ($openssl, $nss, $backend);
+
+# The TLS backend which the server is using should be mostly transparent for
+# the user, apart from individual configuration settings, so keep the backend
+# specific things abstracted behind SSL::Server.
+if ($ENV{with_openssl} eq 'yes')
+{
+	$backend = get_new_openssl_backend();
+	$openssl = 1;
+}
+elsif ($ENV{with_nss} eq 'yes')
+{
+	$backend = get_new_nss_backend();
+	$nss = 1;
+}
 
 use Exporter 'import';
 our @EXPORT = qw(
@@ -145,12 +164,19 @@ sub configure_test_server_for_ssl
 	close $sslconf;
 
 	# Copy all server certificates and keys, and client root cert, to the data dir
-	copy_files("ssl/server-*.crt", $pgdata);
-	copy_files("ssl/server-*.key", $pgdata);
-	chmod(0600, glob "$pgdata/server-*.key") or die $!;
-	copy_files("ssl/root+client_ca.crt", $pgdata);
-	copy_files("ssl/root_ca.crt",        $pgdata);
-	copy_files("ssl/root+client.crl",    $pgdata);
+	if (defined($openssl))
+	{
+		copy_files("ssl/server-*.crt", $pgdata);
+		copy_files("ssl/server-*.key", $pgdata);
+		chmod(0600, glob "$pgdata/server-*.key") or die $!;
+		copy_files("ssl/root+client_ca.crt", $pgdata);
+		copy_files("ssl/root_ca.crt",        $pgdata);
+		copy_files("ssl/root+client.crl",    $pgdata);
+	}
+	elsif (defined($nss))
+	{
+		RecursiveCopy::copypath("ssl/nss", $pgdata . "/nss") if -e "ssl/nss";
+	}
 
 	# Stop and restart server to load new listen_addresses.
 	$node->restart;
@@ -161,6 +187,16 @@ sub configure_test_server_for_ssl
 	return;
 }
 
+sub ssl_library
+{
+	return $backend->get_library();
+}
+
+sub cleanup
+{
+	$backend->cleanup();
+}
+
 # Change the configuration to use given server cert file, and reload
 # the server so that the configuration takes effect.
 sub switch_server_cert
@@ -168,14 +204,16 @@ sub switch_server_cert
 	my $node     = $_[0];
 	my $certfile = $_[1];
 	my $cafile   = $_[2] || "root+client_ca";
+	my $keyfile  = $_[3] || '';
+	my $pwcmd    = $_[4] || '';
 	my $pgdata   = $node->data_dir;
 
+	$keyfile = $certfile if $keyfile eq '';
+
 	open my $sslconf, '>', "$pgdata/sslconfig.conf";
 	print $sslconf "ssl=on\n";
-	print $sslconf "ssl_ca_file='$cafile.crt'\n";
-	print $sslconf "ssl_cert_file='$certfile.crt'\n";
-	print $sslconf "ssl_key_file='$certfile.key'\n";
-	print $sslconf "ssl_crl_file='root+client.crl'\n";
+	print $sslconf $backend->set_server_cert($certfile, $cafile, $keyfile);
+	print $sslconf "ssl_passphrase_command='$pwcmd'\n";
 	close $sslconf;
 
 	$node->restart;
-- 
2.21.1 (Apple Git-122.3)

From 85115b59e7877285ad00837fe96c09a2f1060093 Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Fri, 3 Jul 2020 13:34:27 +0200
Subject: [PATCH] WIP: Support libnss for as TLS backend v4

---
 configure                                     |  211 ++++
 configure.in                                  |   30 +
 src/Makefile.global.in                        |    1 +
 src/backend/libpq/Makefile                    |    4 +
 src/backend/libpq/auth.c                      |    7 +
 src/backend/libpq/be-secure-nss.c             | 1026 +++++++++++++++++
 src/backend/libpq/be-secure.c                 |    3 +
 src/backend/utils/misc/guc.c                  |   20 +-
 src/include/common/pg_nss.h                   |  141 +++
 src/include/libpq/libpq-be.h                  |    9 +-
 src/include/libpq/libpq.h                     |    3 +
 src/include/pg_config.h.in                    |    3 +
 src/include/pg_config_manual.h                |    5 +-
 src/interfaces/libpq/Makefile                 |    4 +
 src/interfaces/libpq/fe-connect.c             |    4 +
 src/interfaces/libpq/fe-secure-nss.c          |  959 +++++++++++++++
 src/interfaces/libpq/libpq-fe.h               |   11 +
 src/interfaces/libpq/libpq-int.h              |    5 +
 src/test/ssl/Makefile                         |  161 +++
 src/test/ssl/t/001_ssltests.pl                |  200 ++--
 src/test/ssl/t/002_scram.pl                   |    4 +-
 src/test/ssl/t/SSL/Backend/NSS.pm             |   65 ++
 src/test/ssl/t/SSL/Backend/OpenSSL.pm         |  103 ++
 .../ssl/t/{SSLServer.pm => SSL/Server.pm}     |   64 +-
 src/tools/msvc/Solution.pm                    |    5 +
 25 files changed, 2930 insertions(+), 118 deletions(-)
 create mode 100644 src/backend/libpq/be-secure-nss.c
 create mode 100644 src/include/common/pg_nss.h
 create mode 100644 src/interfaces/libpq/fe-secure-nss.c
 create mode 100644 src/test/ssl/t/SSL/Backend/NSS.pm
 create mode 100644 src/test/ssl/t/SSL/Backend/OpenSSL.pm
 rename src/test/ssl/t/{SSLServer.pm => SSL/Server.pm} (81%)

diff --git a/configure b/configure
index 9907637e31..a799f125ca 100755
--- a/configure
+++ b/configure
@@ -711,6 +711,7 @@ with_uuid
 with_readline
 with_systemd
 with_selinux
+with_nss
 with_openssl
 with_ldap
 with_krb_srvnam
@@ -856,6 +857,7 @@ with_bsd_auth
 with_ldap
 with_bonjour
 with_openssl
+with_nss
 with_selinux
 with_systemd
 with_readline
@@ -1558,6 +1560,7 @@ Optional Packages:
   --with-ldap             build with LDAP support
   --with-bonjour          build with Bonjour support
   --with-openssl          build with OpenSSL support
+  --with-nss              build with NSS support
   --with-selinux          build with SELinux support
   --with-systemd          build with systemd support
   --without-readline      do not use GNU Readline nor BSD Libedit for editing
@@ -8100,6 +8103,41 @@ fi
 $as_echo "$with_openssl" >&6; }
 
 
+#
+# LibNSS
+#
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether to build with NSS support" >&5
+$as_echo_n "checking whether to build with NSS support... " >&6; }
+
+
+
+# Check whether --with-nss was given.
+if test "${with_nss+set}" = set; then :
+  withval=$with_nss;
+  case $withval in
+    yes)
+
+$as_echo "#define USE_NSS 1" >>confdefs.h
+
+      ;;
+    no)
+      :
+      ;;
+    *)
+      as_fn_error $? "no argument expected for --with-nss option" "$LINENO" 5
+      ;;
+  esac
+
+else
+  with_nss=no
+
+fi
+
+
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $with_nss" >&5
+$as_echo "$with_nss" >&6; }
+
+
 #
 # SELinux
 #
@@ -12174,6 +12212,9 @@ fi
 fi
 
 if test "$with_openssl" = yes ; then
+  if test x"$with_nss" = x"yes" ; then
+    as_fn_error $? "multiple SSL backends cannot be enabled simultaneously\"" "$LINENO" 5
+  fi
     if test "$PORTNAME" != "win32"; then
      { $as_echo "$as_me:${as_lineno-$LINENO}: checking for CRYPTO_new_ex_data in -lcrypto" >&5
 $as_echo_n "checking for CRYPTO_new_ex_data in -lcrypto... " >&6; }
@@ -12432,6 +12473,157 @@ done
 
 fi
 
+if test "$with_nss" = yes ; then
+  if test x"$with_openssl" = x"yes" ; then
+    as_fn_error $? "multiple SSL backends cannot be enabled simultaneously\"" "$LINENO" 5
+  fi
+  CLEANLDFLAGS="$LDFLAGS"
+  # TODO: document this set of LDFLAGS
+  LDFLAGS="-lssl3 -lsmime3 -lnss3 -lplds4 -lplc4 -lnspr4 $LDFLAGS"
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for SSL_VersionRangeSet in -lnss3" >&5
+$as_echo_n "checking for SSL_VersionRangeSet in -lnss3... " >&6; }
+if ${ac_cv_lib_nss3_SSL_VersionRangeSet+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lnss3  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char SSL_VersionRangeSet ();
+int
+main ()
+{
+return SSL_VersionRangeSet ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_lib_nss3_SSL_VersionRangeSet=yes
+else
+  ac_cv_lib_nss3_SSL_VersionRangeSet=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_nss3_SSL_VersionRangeSet" >&5
+$as_echo "$ac_cv_lib_nss3_SSL_VersionRangeSet" >&6; }
+if test "x$ac_cv_lib_nss3_SSL_VersionRangeSet" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_LIBNSS3 1
+_ACEOF
+
+  LIBS="-lnss3 $LIBS"
+
+else
+  as_fn_error $? "library 'nss3' is required for NSS" "$LINENO" 5
+fi
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for PR_GetDefaultIOMethods in -lnspr4" >&5
+$as_echo_n "checking for PR_GetDefaultIOMethods in -lnspr4... " >&6; }
+if ${ac_cv_lib_nspr4_PR_GetDefaultIOMethods+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lnspr4  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char PR_GetDefaultIOMethods ();
+int
+main ()
+{
+return PR_GetDefaultIOMethods ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_lib_nspr4_PR_GetDefaultIOMethods=yes
+else
+  ac_cv_lib_nspr4_PR_GetDefaultIOMethods=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_nspr4_PR_GetDefaultIOMethods" >&5
+$as_echo "$ac_cv_lib_nspr4_PR_GetDefaultIOMethods" >&6; }
+if test "x$ac_cv_lib_nspr4_PR_GetDefaultIOMethods" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_LIBNSPR4 1
+_ACEOF
+
+  LIBS="-lnspr4 $LIBS"
+
+else
+  as_fn_error $? "library 'nspr4' is required for NSS" "$LINENO" 5
+fi
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for SSL_GetImplementedCiphers in -lssl3" >&5
+$as_echo_n "checking for SSL_GetImplementedCiphers in -lssl3... " >&6; }
+if ${ac_cv_lib_ssl3_SSL_GetImplementedCiphers+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lssl3  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char SSL_GetImplementedCiphers ();
+int
+main ()
+{
+return SSL_GetImplementedCiphers ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_lib_ssl3_SSL_GetImplementedCiphers=yes
+else
+  ac_cv_lib_ssl3_SSL_GetImplementedCiphers=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_ssl3_SSL_GetImplementedCiphers" >&5
+$as_echo "$ac_cv_lib_ssl3_SSL_GetImplementedCiphers" >&6; }
+if test "x$ac_cv_lib_ssl3_SSL_GetImplementedCiphers" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_LIBSSL3 1
+_ACEOF
+
+  LIBS="-lssl3 $LIBS"
+
+else
+  as_fn_error $? "library 'ssl3' is required for NSS" "$LINENO" 5
+fi
+
+  LDFLAGS="$CLEANLDFLAGS"
+fi
+
 if test "$with_pam" = yes ; then
   { $as_echo "$as_me:${as_lineno-$LINENO}: checking for pam_start in -lpam" >&5
 $as_echo_n "checking for pam_start in -lpam... " >&6; }
@@ -13334,6 +13526,25 @@ else
 fi
 
 
+fi
+
+if test "$with_nss" = yes ; then
+  ac_fn_c_check_header_mongrel "$LINENO" "ssl.h" "ac_cv_header_ssl_h" "$ac_includes_default"
+if test "x$ac_cv_header_ssl_h" = xyes; then :
+
+else
+  as_fn_error $? "header file <ssl.h> is required for NSS" "$LINENO" 5
+fi
+
+
+  ac_fn_c_check_header_mongrel "$LINENO" "nss.h" "ac_cv_header_nss_h" "$ac_includes_default"
+if test "x$ac_cv_header_nss_h" = xyes; then :
+
+else
+  as_fn_error $? "header file <nss.h> is required for NSS" "$LINENO" 5
+fi
+
+
 fi
 
 if test "$with_pam" = yes ; then
diff --git a/configure.in b/configure.in
index 2e05ce2e4d..f6bc04910b 100644
--- a/configure.in
+++ b/configure.in
@@ -856,6 +856,15 @@ PGAC_ARG_BOOL(with, openssl, no, [build with OpenSSL support],
 AC_MSG_RESULT([$with_openssl])
 AC_SUBST(with_openssl)
 
+#
+# LibNSS
+#
+AC_MSG_CHECKING([whether to build with NSS support])
+PGAC_ARG_BOOL(with, nss, no, [build with NSS support],
+              [AC_DEFINE([USE_NSS], 1, [Define to build with NSS support. (--with-nss)])])
+AC_MSG_RESULT([$with_nss])
+AC_SUBST(with_nss)
+
 #
 # SELinux
 #
@@ -1205,6 +1214,9 @@ if test "$with_gssapi" = yes ; then
 fi
 
 if test "$with_openssl" = yes ; then
+  if test x"$with_nss" = x"yes" ; then
+    AC_MSG_ERROR([multiple SSL backends cannot be enabled simultaneously"])
+  fi
   dnl Order matters!
   if test "$PORTNAME" != "win32"; then
      AC_CHECK_LIB(crypto, CRYPTO_new_ex_data, [], [AC_MSG_ERROR([library 'crypto' is required for OpenSSL])])
@@ -1227,6 +1239,19 @@ if test "$with_openssl" = yes ; then
   AC_CHECK_FUNCS([CRYPTO_lock])
 fi
 
+if test "$with_nss" = yes ; then
+  if test x"$with_openssl" = x"yes" ; then
+    AC_MSG_ERROR([multiple SSL backends cannot be enabled simultaneously"])
+  fi
+  CLEANLDFLAGS="$LDFLAGS"
+  # TODO: document this set of LDFLAGS
+  LDFLAGS="-lssl3 -lsmime3 -lnss3 -lplds4 -lplc4 -lnspr4 $LDFLAGS"
+  AC_CHECK_LIB(nss3, SSL_VersionRangeSet, [], [AC_MSG_ERROR([library 'nss3' is required for NSS])])
+  AC_CHECK_LIB(nspr4, PR_GetDefaultIOMethods, [], [AC_MSG_ERROR([library 'nspr4' is required for NSS])])
+  AC_CHECK_LIB(ssl3, SSL_GetImplementedCiphers, [], [AC_MSG_ERROR([library 'ssl3' is required for NSS])])
+  LDFLAGS="$CLEANLDFLAGS"
+fi
+
 if test "$with_pam" = yes ; then
   AC_CHECK_LIB(pam,    pam_start, [], [AC_MSG_ERROR([library 'pam' is required for PAM])])
 fi
@@ -1402,6 +1427,11 @@ if test "$with_openssl" = yes ; then
   AC_CHECK_HEADER(openssl/err.h, [], [AC_MSG_ERROR([header file <openssl/err.h> is required for OpenSSL])])
 fi
 
+if test "$with_nss" = yes ; then
+  AC_CHECK_HEADER(ssl.h, [], [AC_MSG_ERROR([header file <ssl.h> is required for NSS])])
+  AC_CHECK_HEADER(nss.h, [], [AC_MSG_ERROR([header file <nss.h> is required for NSS])])
+fi
+
 if test "$with_pam" = yes ; then
   AC_CHECK_HEADERS(security/pam_appl.h, [],
                    [AC_CHECK_HEADERS(pam/pam_appl.h, [],
diff --git a/src/Makefile.global.in b/src/Makefile.global.in
index 9a6265b3a0..1f1706c4d0 100644
--- a/src/Makefile.global.in
+++ b/src/Makefile.global.in
@@ -184,6 +184,7 @@ with_perl	= @with_perl@
 with_python	= @with_python@
 with_tcl	= @with_tcl@
 with_openssl	= @with_openssl@
+with_nss        = @with_nss@
 with_readline	= @with_readline@
 with_selinux	= @with_selinux@
 with_systemd	= @with_systemd@
diff --git a/src/backend/libpq/Makefile b/src/backend/libpq/Makefile
index efc5ef760a..191266a426 100644
--- a/src/backend/libpq/Makefile
+++ b/src/backend/libpq/Makefile
@@ -30,6 +30,10 @@ OBJS = \
 
 ifeq ($(with_openssl),yes)
 OBJS += be-secure-openssl.o
+else
+ifeq ($(with_nss),yes)
+OBJS += be-secure-nss.o
+endif
 endif
 
 ifeq ($(with_gssapi),yes)
diff --git a/src/backend/libpq/auth.c b/src/backend/libpq/auth.c
index 02b6c3f127..8f4197d002 100644
--- a/src/backend/libpq/auth.c
+++ b/src/backend/libpq/auth.c
@@ -2870,7 +2870,14 @@ CheckCertAuth(Port *port)
 {
 	int			status_check_usermap = STATUS_ERROR;
 
+#if defined(USE_OPENSSL)
 	Assert(port->ssl);
+#elif defined(USE_NSS)
+	/* TODO: should we rename pr_fd to ssl, to keep consistency? */
+	Assert(port->pr_fd);
+#else
+	Assert(false);
+#endif
 
 	/* Make sure we have received a username in the certificate */
 	if (port->peer_cn == NULL ||
diff --git a/src/backend/libpq/be-secure-nss.c b/src/backend/libpq/be-secure-nss.c
new file mode 100644
index 0000000000..07df6c2752
--- /dev/null
+++ b/src/backend/libpq/be-secure-nss.c
@@ -0,0 +1,1026 @@
+/*-------------------------------------------------------------------------
+ *
+ * be-secure-nss.c
+ *	  functions for supporting NSS as a TLS backend
+ *
+ *
+ * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ *	  src/backend/libpq/be-secure-nss.c
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#include "postgres.h"
+
+#include <sys/stat.h>
+
+/*
+ * BITS_PER_BYTE is also defined in the NSPR header fils, so we need to undef
+ * our version to avoid compiler warnings on redefinition.
+ */
+#define pg_BITS_PER_BYTE BITS_PER_BYTE
+#undef BITS_PER_BYTE
+
+/*
+ * The nspr/obsolete/protypes.h NSPR header typedefs uint64 and int64 with
+ * colliding definitions from ours, causing a much expected compiler error.
+ * The definitions are however not actually used in NSPR at all, and are only
+ * intended for what seems to be backwards compatibility for apps written
+ * against old versions of NSPR.  The following comment is in the referenced
+ * file, and was added in 1998:
+ *
+ *		This section typedefs the old 'native' types to the new PR<type>s.
+ *		These definitions are scheduled to be eliminated at the earliest
+ *		possible time. The NSPR API is implemented and documented using
+ *		the new definitions.
+ *
+ * As there is no opt-out from pulling in these typedefs, we define the guard
+ * for the file to exclude it. This is incredibly ugly, but seems to be about
+ * the only way around it.
+ */
+#define PROTYPES_H
+#include <nspr.h>
+#undef PROTYPES_H
+#include <nss.h>
+#include <prio.h>
+#include <ssl.h>
+#include <sslerr.h>
+#include <secerr.h>
+#include <sslproto.h>
+#include <prtypes.h>
+#include <pk11pub.h>
+#include <secitem.h>
+#include <secport.h>
+#include <secder.h>
+#include <certdb.h>
+#include <base64.h>
+#include <cert.h>
+#include <prerror.h>
+#include <keyhi.h>
+
+typedef struct
+{
+	enum
+	{
+		PW_NONE = 0,
+		PW_FROMFILE = 1,
+		PW_PLAINTEXT = 2,
+		PW_EXTERNAL = 3
+	} source;
+	char *data;
+} secuPWData;
+
+/*
+ * Ensure that the colliding definitions match, else throw an error. In case
+ * NSPR has removed the definition for some reasone, make sure to put ours
+ * back again.
+ */
+#if defined(BITS_PER_BYTE)
+#  if BITS_PER_BYTE != pg_BITS_PER_BYTE
+#    error "incompatible byte widths between NSPR and postgres"
+#  endif
+#else
+#  define BITS_PER_BYTE pg_BITS_PER_BYTE
+#endif
+#undef pg_BITS_PER_BYTE
+
+#include "common/pg_nss.h"
+#include "lib/stringinfo.h"
+#include "libpq/libpq.h"
+#include "nodes/pg_list.h"
+#include "miscadmin.h"
+#include "storage/fd.h"
+#include "utils/guc.h"
+#include "utils/memutils.h"
+
+static PRDescIdentity pr_id;
+
+static PRIOMethods				pr_iomethods;
+static NSSInitContext		   *nss_context = NULL;
+static SSLVersionRange			desired_sslver;
+
+/*
+ * PR_ImportTCPSocket() is a private API, but very widely used, as it's the
+ * only way to make NSS use an already set up POSIX file descriptor rather
+ * than opening one itself. To quote the NSS documentation:
+ *
+ *		"In theory, code that uses PR_ImportTCPSocket may break when NSPR's
+ *		implementation changes. In practice, this is unlikely to happen because
+ *		NSPR's implementation has been stable for years and because of NSPR's
+ *		strong commitment to backward compatibility."
+ *
+ * https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSPR/Reference/PR_ImportTCPSocket
+ *
+ * The function is declared in <private/pprio.h>, but as it is a header marked
+ * private we declare it here rather than including it.
+ */
+NSPR_API(PRFileDesc*) PR_ImportTCPSocket(int);
+
+/* NSS IO layer callback overrides */
+static PRInt32 pg_ssl_read(PRFileDesc *fd, void *buf, PRInt32 amount,
+						   PRIntn flags, PRIntervalTime timeout);
+static PRInt32 pg_ssl_write(PRFileDesc *fd, const void *buf, PRInt32 amount,
+							PRIntn flags, PRIntervalTime timeout);
+/* Utility functions */
+static PRFileDesc *init_iolayer(Port *port, int loglevel);
+static uint16 ssl_protocol_version_to_nss(int v, const char *guc_name);
+
+static char *pg_SSLerrmessage(PRErrorCode errcode);
+static char *ssl_protocol_version_to_string(int v);
+static SECStatus pg_cert_auth_handler(void *arg, PRFileDesc *fd,
+			PRBool checksig, PRBool isServer);
+static SECStatus pg_bad_cert_handler(void *arg, PRFileDesc *fd);
+
+/* ------------------------------------------------------------ */
+/*						 Public interface						*/
+/* ------------------------------------------------------------ */
+
+static char *
+ssl_passphrase_callback(PK11SlotInfo *slot, PRBool retry, void *arg)
+{
+	return pstrdup("");
+}
+
+/*
+ * be_tls_init
+ *			Initialize the nss TLS library in the postmaster
+ *
+ * The majority of the setup needs to happen in be_tls_open_server since the
+ * NSPR initialization must happen after the forking of the backend. We could
+ * potentially move some parts in under !isServerStart, but so far this is the
+ * separation chosen.
+ */
+int
+be_tls_init(bool isServerStart)
+{
+	SECStatus			status;
+	SSLVersionRange		supported_sslver;
+
+	/*
+	 * Set up the connection cache for multi-processing application behavior.
+	 * If we are in ServerStart then we initialize the cache. If the server is
+	 * already started, we inherit the cache such that it can be used for
+	 * connections. Calling SSL_ConfigMPServerSIDCache sets an environment
+	 * variable which contains enough information for the forked child to know
+	 * how to access it.  Passing NULL to SSL_InheritMPServerSIDCache will make
+	 * the forked child look it up by the default name SSL_INHERITANCE, if env
+	 * vars aren't inherited then the contents of the variable can be passed
+	 * instead.
+	 */
+	if (isServerStart)
+	{
+		/*
+		 * SSLv2 and SSLv3 are disabled in this TLS backend, but when setting
+		 * up the required session cache for NSS we still must supply timeout
+		 * values for v2 and The minimum allowed value for both is 5
+		 * seconds, so opt for that in both cases (the defaults being 100
+		 * seconds and 24 hours).
+		 *
+		 * Passing NULL as the directory for the session cache will default to
+		 * using /tmp on UNIX and \\temp on Windows.  Deciding if we want to
+		 * keep closer control on this directory is left as a TODO.
+		 */
+		status = SSL_ConfigMPServerSIDCache(MaxConnections, 5, 5, NULL);
+		if (status != SECSuccess)
+			ereport(FATAL,
+					(errmsg("unable to set up TLS connection cache: %s",
+							pg_SSLerrmessage(PR_GetError()))));
+
+	}
+	else
+	{
+		status = SSL_InheritMPServerSIDCache(NULL);
+		if (status != SECSuccess)
+		{
+			ereport(LOG,
+					(errmsg("unable to connect to TLS connection cache: %s",
+							pg_SSLerrmessage(PR_GetError()))));
+			return -1;
+		}
+	}
+
+	if (!ssl_database || strlen(ssl_database) == 0)
+	{
+		ereport(isServerStart ? FATAL : LOG,
+				(errmsg("no certificate database specified")));
+		goto error;
+	}
+
+	/*
+	 * We check for the desired TLS version range here, even though we cannot
+	 * set it until be_open_server such that we can be compatible with how the
+	 * OpenSSL backend reports errors for incompatible range configurations.
+	 * Set either the default supported TLS version range, or the configured
+	 * range from ssl_min_protocol_version and ssl_max_protocol version. In
+	 * case the user hasn't defined the maximum allowed version we fall back
+	 * to the highest version TLS that the library supports.
+	 */
+	if (SSL_VersionRangeGetSupported(ssl_variant_stream, &supported_sslver) != SECSuccess)
+	{
+		ereport(isServerStart ? FATAL : LOG,
+				(errmsg("unable to get default protocol support from NSS")));
+		goto error;
+	}
+
+	/*
+	 * Set the fallback versions for the TLS protocol version range to a
+	 * combination of our minimal requirement and the library maximum.
+	 */
+	desired_sslver.min = SSL_LIBRARY_VERSION_TLS_1_0;
+	desired_sslver.max = supported_sslver.max;
+
+	if (ssl_min_protocol_version)
+	{
+		int ver = ssl_protocol_version_to_nss(ssl_min_protocol_version,
+											  "ssl_min_protocol_version");
+		if (ver == -1)
+		{
+			ereport(isServerStart ? FATAL : LOG,
+					(errmsg("\"%s\" setting \"%s\" not supported by this build",
+							"ssl_min_protocol_version",
+							GetConfigOption("ssl_min_protocol_version",
+											false, false))));
+			goto error;
+		}
+
+		if (ver > 0)
+			desired_sslver.min = ver;
+	}
+
+	if (ssl_max_protocol_version)
+	{
+		int ver = ssl_protocol_version_to_nss(ssl_max_protocol_version,
+											  "ssl_max_protocol_version");
+		if (ver == -1)
+		{
+			ereport(isServerStart ? FATAL : LOG,
+					(errmsg("\"%s\" setting \"%s\" not supported by this build",
+							"ssl_max_protocol_version",
+							GetConfigOption("ssl_max_protocol_version",
+											false, false))));
+			goto error;
+		}
+		if (ver > 0)
+			desired_sslver.max = ver;
+
+		if (ver < desired_sslver.min)
+		{
+			ereport(isServerStart ? FATAL : LOG,
+					(errmsg("could not set SSL protocol version range"),
+					 errdetail("\"%s\" cannot be higher than \"%s\"",
+							   "ssl_min_protocol_version",
+							   "ssl_max_protocol_version")));
+			goto error;
+		}
+	}
+
+	return 0;
+error:
+	return -1;
+}
+
+int
+be_tls_open_server(Port *port)
+{
+	SECStatus			status;
+	PRFileDesc		   *model;
+	PRFileDesc		   *pr_fd;
+	PRFileDesc		   *layer;
+	CERTCertificate	   *server_cert;
+	SECKEYPrivateKey   *private_key;
+	CERTSignedCrl	   *crl;
+	SECItem				crlname;
+	secuPWData pwdata = { PW_NONE, 0 };		/* TODO: This is a bogus callback */
+	char			   *cert_database;
+	NSSInitParameters	params;
+
+	/*
+	 * The NSPR documentation states that runtime initialization via PR_Init is
+	 * no longer required, as the first caller into NSPR will perform the
+	 * initialization implicitly. The documentation doesn't however clarify
+	 * from which version this is holds true, so let's perform the potentially
+	 * superfluous initialization anyways to avoid crashing on older versions
+	 * of NSPR, as there is no difference in overhead.  The NSS documentation
+	 * still states that PR_Init must be called in some way (implicitly or
+	 * explicitly).
+	 *
+	 * The below parameters are what the implicit initialization would've done
+	 * for us, and should work even for older versions where it might not be
+	 * done automatically. The last parameter, maxPTDs, is set to various
+	 * values in other codebases, but has been unused since NSPR 2.1 which was
+	 * released sometime in 1998.
+	 */
+	PR_Init(PR_USER_THREAD, PR_PRIORITY_NORMAL, 0 /* maxPTDs */);
+
+	/*
+	 * The certificate path (configdir) must contain a valid NSS database.
+	 * If the certificate path isn't a valid directory, NSS will fall back on
+	 * the system certificate database. If the certificate path is a directory
+	 * but is empty then the initialization will fail. On the client side this
+	 * can be allowed for any sslmode but the verify-xxx ones.
+	 * https://bugzilla.redhat.com/show_bug.cgi?id=728562
+	 * For the server side we wont allow this to fail however, as we require
+	 * the certificate and key to exist.
+	 *
+	 * The original design of NSS was for a single application to use a single
+	 * copy of it, initialized with NSS_Initialize() which isn't returning any
+	 * handle with which to refer to NSS. NSS initialization and shutdown are
+	 * global for the application, so a shutdown in another NSS enabled library
+	 * would cause NSS to be stopped for libpq as well.  The fix has been to
+	 * introduce NSS_InitContext which returns a context handle to pass to
+	 * NSS_ShutdownContext.  NSS_InitContext was introduced in NSS 3.12, but
+	 * the use of it is not very well documented.
+	 * https://bugzilla.redhat.com/show_bug.cgi?id=738456
+	 *
+	 * The InitParameters struct passed can be used to override internal values
+	 * in NSS, but the usage is not documented at all. When using NSS_Init
+	 * initializations, the values are instead set via PK11_Configure calls so
+	 * the PK11_Configure documentation can be used to glean some details on
+	 * these.
+	 *
+	 * https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS/PKCS11/Module_Specs
+	 */
+	memset(&params, '\0', sizeof(params));
+	params.length = sizeof(params);
+
+	if (!ssl_database || strlen(ssl_database) == 0)
+		ereport(FATAL,
+				(errmsg("no certificate database specified")));
+
+	cert_database = psprintf("sql:%s", ssl_database);
+	nss_context = NSS_InitContext(cert_database, "", "", "",
+								  &params,
+								  NSS_INIT_READONLY | NSS_INIT_PK11RELOAD);
+	pfree(cert_database);
+
+	if (!nss_context)
+		ereport(FATAL,
+				(errmsg("unable to read certificate database \"%s\": %s",
+						ssl_database, pg_SSLerrmessage(PR_GetError()))));
+
+	/*
+	 * Set the passphrase callback which will be used both to obtain the
+	 * passphrase from the user, as well as by NSS to obtain the phrase
+	 * repeatedly.
+	 *
+	 * TODO: Figure this out - do note that we are setting another password
+	 * callback below for cert/key as well. Need to make sense of all these.
+	 */
+	PK11_SetPasswordFunc(ssl_passphrase_callback);
+
+	/*
+	 * Import the already opened socket as we don't want to use NSPR functions
+	 * for opening the network socket due to how the PostgreSQL protocol works
+	 * with TLS connections. This function is not part of the NSPR public API,
+	 * see the comment at the top of the file for the rationale of still using
+	 * it.
+	 */
+	pr_fd = PR_ImportTCPSocket(port->sock);
+	if (!pr_fd)
+		ereport(ERROR,
+				(errmsg("unable to connect to socket")));
+
+	/*
+	 * Most of the documentation available, and implementations of, NSS/NSPR
+	 * use the PR_NewTCPSocket() function here, which has the drawback that it
+	 * can only create IPv4 sockets. Instead use PR_OpenTCPSocket() which copes
+	 * with IPv6 as well.
+	 */
+	model = PR_OpenTCPSocket(port->laddr.addr.ss_family);
+	if (!model)
+		ereport(ERROR,
+				(errmsg("unable to open socket")));
+
+	/*
+	 * Convert the NSPR socket to an SSL socket. Ensuring the success of this
+	 * operation is critical as NSS SSL_* functions may return SECSuccess on
+	 * the socket even though SSL hasn't been enabled, which introduce a risk
+	 * of silent downgrades.
+	 */
+	model = SSL_ImportFD(NULL, model);
+	if (!model)
+		ereport(ERROR,
+				(errmsg("unable to enable TLS on socket")));
+
+	/*
+	 * Configure basic settings for the connection over the SSL socket in
+	 * order to set it up as a server.
+	 */
+	if (SSL_OptionSet(model, SSL_SECURITY, PR_TRUE) != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to configure TLS connection")));
+
+	if (SSL_OptionSet(model, SSL_HANDSHAKE_AS_SERVER, PR_TRUE) != SECSuccess ||
+		SSL_OptionSet(model, SSL_HANDSHAKE_AS_CLIENT, PR_FALSE) != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to configure TLS connection as server")));
+
+	/*
+	 * SSLv2 is disabled by default, and SSLv3 will be excluded from the range
+	 * of allowed protocols further down. Since we really don't want these to
+	 * ever be enabled, let's use belts and suspenders and explicitly turn
+	 * them off as well.
+	 */
+	SSL_OptionSet(model, SSL_ENABLE_SSL2, PR_FALSE);
+	SSL_OptionSet(model, SSL_ENABLE_SSL3, PR_FALSE);
+
+#ifdef SSL_CBC_RANDOM_IV
+	/*
+	 * Enable protection against the BEAST attack in case the NSS server has
+	 * support for that. While SSLv3 is disabled, we may still allow TLSv1
+	 * which is affected. The option isn't documented as an SSL option, but as
+	 * an NSS environment variable.
+	 */
+	SSL_OptionSet(model, SSL_CBC_RANDOM_IV, PR_TRUE);
+#endif
+
+	/*
+	 * Configure the allowed cipher. If there are no user preferred suites, set
+	 * the domestic policy. TODO: while this code works, the set of ciphers
+	 * which can be set and still end up with a working socket is woefully
+	 * underdocumented for anything more recent than SSLv3 (the code for TLS
+	 * actually calls ssl3 functions under the hood for SSL_CipherPrefSet),
+	 * so it's unclear if this is helpful or not. Using the policies works,
+	 * but may be too coarsely grained.
+	 *
+	 * Another TODO: The SSL_ImplementedCiphers table returned with calling
+	 * SSL_GetImplementedCiphers is sorted in server preference order. Sorting
+	 * SSLCipherSuites according to the order of the ciphers therein could be
+	 * a way to implement ssl_prefer_server_ciphers - if we at all want to use
+	 * cipher selection for NSS like how we do it for OpenSSL that is.
+	 */
+
+	/*
+	 * If no ciphers are specified, we use the domestic policy
+	 */
+	if (!SSLCipherSuites || strlen(SSLCipherSuites) == 0)
+	{
+		status = NSS_SetDomesticPolicy();
+		if (status != SECSuccess)
+			ereport(ERROR,
+					(errmsg("unable to set cipher policy: %s",
+							pg_SSLerrmessage(PR_GetError()))));
+	}
+	else
+	{
+		char		   *ciphers, *c, *b;
+		char		   *sep = ":;, ";
+		PRUint16		ciphercode;
+		const PRUint16 *nss_ciphers;
+
+		/*
+		 * If the user has specified a set of preferred cipher suites we start
+		 * by turning off all the existing suites to avoid the risk of down-
+		 * grades to a weaker cipher than expected.
+		 */
+		nss_ciphers = SSL_GetImplementedCiphers();
+		for (int i = 0; i < SSL_GetNumImplementedCiphers(); i++)
+			SSL_CipherPrefSet(model, nss_ciphers[i], PR_FALSE);
+
+		ciphers = pstrdup(SSLCipherSuites);
+
+		for (c = strtok_r(ciphers, sep, &b); c; c = strtok_r(NULL, sep, &b))
+		{
+			ciphercode = pg_find_cipher(c);
+			if (ciphercode != INVALID_CIPHER)
+			{
+				status = SSL_CipherPrefSet(model, ciphercode, PR_TRUE);
+				if (status != SECSuccess)
+					ereport(ERROR,
+							(errmsg("invalid cipher-suite specified: %s", c)));
+			}
+		}
+
+		pfree(ciphers);
+	}
+
+	if (SSL_VersionRangeSet(model, &desired_sslver) != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to set requested SSL protocol version range")));
+
+	/*
+	 * Set up the custom IO layer.
+	 */
+	layer = init_iolayer(port, ERROR);
+	if (!layer)
+		goto error;
+
+	/* Store the Port as private data available in callbacks */
+	layer->secret = (void *) port;
+
+	if (PR_PushIOLayer(pr_fd, PR_TOP_IO_LAYER, layer) != PR_SUCCESS)
+	{
+		PR_Close(layer);
+		ereport(ERROR,
+				(errmsg("unable to push IO layer")));
+	}
+
+	/* TODO: set the postgres password callback param as callback function */
+	server_cert = PK11_FindCertFromNickname(ssl_cert_file, &pwdata /* password callback */);
+	if (!server_cert)
+		ereport(ERROR,
+				(errmsg("unable to find certificate for \"%s\": %s",
+						ssl_cert_file, pg_SSLerrmessage(PR_GetError()))));
+
+	/* TODO: set the postgres password callback param as callback function */
+	private_key = PK11_FindKeyByAnyCert(server_cert, &pwdata /* password callback */);
+	if (!private_key)
+		ereport(ERROR,
+				(errmsg("unable to find private key for \"%s\": %s",
+						ssl_cert_file, pg_SSLerrmessage(PR_GetError()))));
+
+	/*
+	 * NSS doesn't use CRL files on disk, so we use the ssl_crl_file guc to
+	 * contain the CRL nickname for the current server certificate in the NSS
+	 * certificate database. The main difference from the OpenSSL backend is
+	 * that NSS will use the CRL regardless, but being able to make sure the
+	 * CRL is loaded seems like a good feature.
+	 */
+	if (ssl_crl_file[0])
+	{
+		SECITEM_CopyItem(NULL, &crlname, &server_cert->derSubject);
+		crl = SEC_FindCrlByName(CERT_GetDefaultCertDB(), &crlname, SEC_CRL_TYPE);
+		if (!crl)
+			ereport(ERROR,
+					(errmsg("specified CRL not found in database")));
+		SEC_DestroyCrl(crl);
+	}
+
+	/*
+	 * Finally we must configure the socket for being a server by setting the
+	 * certificate and key.
+	 */
+	status = SSL_ConfigSecureServer(model, server_cert, private_key, kt_rsa);
+	if (status != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to configure secure server: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+	status = SSL_ConfigServerCert(model, server_cert, private_key, NULL, 0);
+	if (status != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to configure server for TLS server connections: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+
+	ssl_loaded_verify_locations = true;
+
+	/*
+	 * At this point, we no longer have use for the certificate and private
+	 * key as they have been copied into the context by NSS. Destroy our
+	 * copies explicitly to clean out the memory as best we can.
+	 */
+	CERT_DestroyCertificate(server_cert);
+	SECKEY_DestroyPrivateKey(private_key);
+
+	status = SSL_AuthCertificateHook(model, pg_cert_auth_handler, (void *) port);
+	if (status != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to install authcert hook: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+	SSL_BadCertHook(model, pg_bad_cert_handler, (void *) port);
+	SSL_OptionSet(model, SSL_REQUEST_CERTIFICATE, PR_TRUE);
+	SSL_OptionSet(model, SSL_REQUIRE_CERTIFICATE, PR_FALSE);
+
+	port->pr_fd = SSL_ImportFD(model, pr_fd);
+	if (!port->pr_fd)
+		ereport(ERROR,
+				(errmsg("unable to initialize")));
+
+	PR_Close(model);
+
+	/*
+	 * Force a handshake on the next I/O request, the second parameter means
+	 * that we are a server, PR_FALSE would indicate being a client. NSPR
+	 * requires us to call SSL_ResetHandshake since we imported an already
+	 * established socket.
+	 */
+	status = SSL_ResetHandshake(port->pr_fd, PR_TRUE);
+	if (status != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to initiate handshake: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+	status = SSL_ForceHandshake(port->pr_fd);
+	if (status != SECSuccess)
+		ereport(ERROR,
+			(errmsg("unable to handshake: %s",
+					pg_SSLerrmessage(PR_GetError()))));
+
+	port->ssl_in_use = true;
+	return 0;
+
+error:
+	return 1;
+}
+
+ssize_t
+be_tls_read(Port *port, void *ptr, size_t len, int *waitfor)
+{
+	ssize_t			n_read;
+	PRErrorCode		err;
+
+	n_read = PR_Read(port->pr_fd, ptr, len);
+
+	if (n_read < 0)
+	{
+		err = PR_GetError();
+
+		/* XXX: This logic seems potentially bogus? */
+		if (err == PR_WOULD_BLOCK_ERROR)
+			*waitfor = WL_SOCKET_READABLE;
+		else
+			*waitfor = WL_SOCKET_WRITEABLE;
+	}
+
+	return n_read;
+}
+
+ssize_t
+be_tls_write(Port *port, void *ptr, size_t len, int *waitfor)
+{
+	ssize_t			n_write;
+	PRErrorCode		err;
+
+	n_write = PR_Send(port->pr_fd, ptr, len, 0, PR_INTERVAL_NO_WAIT);
+
+	if (n_write < 0)
+	{
+		err = PR_GetError();
+
+		if (err == PR_WOULD_BLOCK_ERROR)
+			*waitfor = WL_SOCKET_WRITEABLE;
+		else
+			*waitfor = WL_SOCKET_READABLE;
+	}
+
+	return n_write;
+}
+
+void
+be_tls_close(Port *port)
+{
+	if (!port)
+		return;
+
+	if (port->peer_cn)
+	{
+		SSL_InvalidateSession(port->pr_fd);
+		pfree(port->peer_cn);
+		port->peer_cn = NULL;
+	}
+
+	PR_Close(port->pr_fd);
+	port->pr_fd = NULL;
+	port->ssl_in_use = false;
+
+	if (nss_context)
+	{
+		NSS_ShutdownContext(nss_context);
+		nss_context = NULL;
+	}
+}
+
+void
+be_tls_destroy(void)
+{
+	/*
+	 * It reads a bit odd to clear a session cache when we are destroying the
+	 * context altogether, but if the session cache isn't cleared before
+	 * shutting down the context it will fail with SEC_ERROR_BUSY.
+	 */
+	SSL_ClearSessionCache();
+}
+
+int
+be_tls_get_cipher_bits(Port *port)
+{
+	SECStatus			status;
+	SSLChannelInfo		channel;
+	SSLCipherSuiteInfo	suite;
+
+	status = SSL_GetChannelInfo(port->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+		goto error;
+
+	status = SSL_GetCipherSuiteInfo(channel.cipherSuite, &suite, sizeof(suite));
+	if (status != SECSuccess)
+		goto error;
+
+	return suite.effectiveKeyBits;
+
+error:
+	ereport(WARNING,
+			(errmsg("unable to extract TLS session information: %s",
+					pg_SSLerrmessage(PR_GetError()))));
+	return 0;
+}
+
+/*
+ * be_tls_get_compression
+ *
+ * NSS disabled support for TLS compression in version 3.33 and removed the
+ * code in a subsequent release. The API for retrieving information about
+ * compression as well as enabling it is kept for backwards compatibility, but
+ * we don't need to consult it since it was only available for SSLv3 which we
+ * don't support.
+ *
+ * https://bugzilla.mozilla.org/show_bug.cgi?id=1409587
+ */
+bool
+be_tls_get_compression(Port *port)
+{
+	return false;
+}
+
+const char *
+be_tls_get_version(Port *port)
+{
+	SECStatus			status;
+	SSLChannelInfo		channel;
+
+	status = SSL_GetChannelInfo(port->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+	{
+		ereport(WARNING,
+				(errmsg("unable to extract TLS session information: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+		return NULL;
+	}
+
+	return ssl_protocol_version_to_string(channel.protocolVersion);
+}
+
+const char *
+be_tls_get_cipher(Port *port)
+{
+	SECStatus			status;
+	SSLChannelInfo		channel;
+	SSLCipherSuiteInfo	suite;
+
+	status = SSL_GetChannelInfo(port->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+		goto error;
+
+	status = SSL_GetCipherSuiteInfo(channel.cipherSuite, &suite, sizeof(suite));
+	if (status != SECSuccess)
+		goto error;
+
+	return suite.cipherSuiteName;
+
+error:
+	ereport(WARNING,
+			(errmsg("unable to extract TLS session information: %s",
+					pg_SSLerrmessage(PR_GetError()))));
+	return NULL;
+}
+
+void
+be_tls_get_peer_subject_name(Port *port, char *ptr, size_t len)
+{
+	CERTCertificate	   *certificate;
+
+	certificate = SSL_PeerCertificate(port->pr_fd);
+	if (certificate)
+		strlcpy(ptr, CERT_NameToAscii(&certificate->subject), len);
+	else
+		ptr[0] = '\0';
+}
+
+void
+be_tls_get_peer_issuer_name(Port *port, char *ptr, size_t len)
+{
+	CERTCertificate	    *certificate;
+
+	certificate = SSL_PeerCertificate(port->pr_fd);
+	if (certificate)
+		strlcpy(ptr, CERT_NameToAscii(&certificate->issuer), len);
+	else
+		ptr[0] = '\0';
+}
+
+void
+be_tls_get_peer_serial(Port *port, char *ptr, size_t len)
+{
+	CERTCertificate	   *certificate;
+
+	certificate = SSL_PeerCertificate(port->pr_fd);
+	if (certificate)
+		snprintf(ptr, len, "%li", DER_GetInteger(&(certificate->serialNumber)));
+	else
+		ptr[0] = '\0';
+}
+
+static SECStatus
+pg_bad_cert_handler(void *arg, PRFileDesc *fd)
+{
+	Port			   *port = (Port *) arg;
+
+	port->peer_cert_valid = false;
+	return SECFailure;
+}
+
+static SECStatus
+pg_cert_auth_handler(void *arg, PRFileDesc *fd, PRBool checksig, PRBool isServer)
+{
+	SECStatus			status;
+	Port			   *port = (Port *) arg;
+	CERTCertificate	   *cert;
+	char			   *peer_cn;
+	int					len;
+
+	status = SSL_AuthCertificate(CERT_GetDefaultCertDB(), port->pr_fd, checksig, PR_TRUE);
+	if (status == SECSuccess)
+	{
+		cert = SSL_PeerCertificate(port->pr_fd);
+		len = strlen(cert->subjectName);
+		peer_cn = MemoryContextAllocZero(TopMemoryContext, len + 1);
+		if (strncmp(cert->subjectName, "CN=", 3) == 0)
+			strlcpy(peer_cn, cert->subjectName + strlen("CN="), len + 1);
+		else
+			strlcpy(peer_cn, cert->subjectName, len + 1);
+		CERT_DestroyCertificate(cert);
+
+		port->peer_cn = peer_cn;
+		port->peer_cert_valid = true;
+	}
+
+	return status;
+}
+
+/* ------------------------------------------------------------ */
+/*						Internal functions						*/
+/* ------------------------------------------------------------ */
+
+static PRInt32
+pg_ssl_read(PRFileDesc *fd, void *buf, PRInt32 amount, PRIntn flags,
+			PRIntervalTime timeout)
+{
+	PRRecvFN		read_fn;
+	PRInt32			n_read;
+
+	read_fn = fd->lower->methods->recv;
+	n_read = read_fn(fd->lower, buf, amount, flags, timeout);
+
+	return n_read;
+}
+
+static PRInt32
+pg_ssl_write(PRFileDesc *fd, const void *buf, PRInt32 amount, PRIntn flags,
+			 PRIntervalTime timeout)
+{
+	PRSendFN		send_fn;
+	PRInt32			n_write;
+
+	send_fn = fd->lower->methods->send;
+	n_write = send_fn(fd->lower, buf, amount, flags, timeout);
+
+	return n_write;
+}
+
+static PRFileDesc *
+init_iolayer(Port *port, int loglevel)
+{
+	const PRIOMethods	   *default_methods;
+	PRFileDesc			   *layer;
+
+	/*
+	 * Start by initializing our layer with all the default methods so that
+	 * we can selectively override the ones we want while still ensuring that
+	 * we have a complete layer specification.
+	 */
+	default_methods = PR_GetDefaultIOMethods();
+	memcpy(&pr_iomethods, default_methods, sizeof(PRIOMethods));
+
+	pr_iomethods.recv = pg_ssl_read;
+	pr_iomethods.send = pg_ssl_write;
+
+	/*
+	 * Each IO layer must be identified by a unique name, where uniqueness is
+	 * per connection. Each connection in a postgres cluster can generate the
+	 * identity from the same string as they will create their IO layers on
+	 * different sockets. Only one layer per socket can have the same name.
+	 */
+	pr_id = PR_GetUniqueIdentity("PostgreSQL");
+	if (pr_id == PR_INVALID_IO_LAYER)
+	{
+		ereport(loglevel,
+				(errmsg("out of memory when setting up TLS connection")));
+		return NULL;
+	}
+
+	/*
+	 * Create the actual IO layer as a stub such that it can be pushed onto
+	 * the layer stack. The step via a stub is required as we define custom
+	 * callbacks.
+	 */
+	layer = PR_CreateIOLayerStub(pr_id, &pr_iomethods);
+	if (!layer)
+	{
+		ereport(loglevel,
+				(errmsg("unable to create NSS I/O layer")));
+		return NULL;
+	}
+
+	return layer;
+}
+
+static char *
+ssl_protocol_version_to_string(int v)
+{
+	switch(v)
+	{
+		/* SSL v2 and v3 are not supported */
+		case SSL_LIBRARY_VERSION_2:
+		case SSL_LIBRARY_VERSION_3_0:
+			Assert(false);
+			break;
+
+		case SSL_LIBRARY_VERSION_TLS_1_0:
+			return pstrdup("TLSv1.0");
+		case SSL_LIBRARY_VERSION_TLS_1_1:
+			return pstrdup("TLSv1.1");
+		case SSL_LIBRARY_VERSION_TLS_1_2:
+			return pstrdup("TLSv1.2");
+		case SSL_LIBRARY_VERSION_TLS_1_3:
+			return pstrdup("TLSv1.3");
+	}
+
+	return pstrdup("unknown");
+}
+
+
+/*
+ * ssl_protocol_version_to_nss
+ *			Translate PostgreSQL TLS version to NSS version
+ *
+ * Returns zero in case the requested TLS version is undefined (PG_ANY) and
+ * should be set by the caller, or -1 on failure.
+ */
+static uint16
+ssl_protocol_version_to_nss(int v, const char *guc_name)
+{
+	switch(v)
+	{
+		/*
+		 * There is no SSL_LIBRARY_ macro defined in NSS with the value zero,
+		 * so we use this to signal the caller that the highest useful version
+		 * should be set on the connection.
+		 */
+		case PG_TLS_ANY:
+			return 0;
+		/*
+		 * No guard is required here as there are no versions of NSS without
+		 * support for TLS1.
+		 */
+		case PG_TLS1_VERSION:
+			return SSL_LIBRARY_VERSION_TLS_1_0;
+		case PG_TLS1_1_VERSION:
+#ifdef SSL_LIBRARY_VERSION_TLS_1_1
+			return SSL_LIBRARY_VERSION_TLS_1_1;
+#else
+			break;
+#endif
+		case PG_TLS1_2_VERSION:
+#ifdef SSL_LIBRARY_VERSION_TLS_1_2
+			return SSL_LIBRARY_VERSION_TLS_1_2;
+#else
+			break;
+#endif
+		case PG_TLS1_3_VERSION:
+#ifdef SSL_LIBRARY_VERSION_TLS_1_3
+			return SSL_LIBRARY_VERSION_TLS_1_3;
+#else
+			break;
+#endif
+		default:
+			break;
+	}
+
+	return -1;
+}
+
+/*
+ * pg_SSLerrmessage
+ *		Create and return a human readable error message given
+ *		the specified error code
+ *
+ * PR_ErrorToName only converts the enum identifier of the error to string,
+ * but that can be quite useful for debugging (and in case PR_ErrorToString is
+ * unable to render a message then we at least have something).
+ */
+static char *
+pg_SSLerrmessage(PRErrorCode errcode)
+{
+	char		error[128];
+	int			ret;
+
+	/* TODO: this should perhaps use a StringInfo instead.. */
+	ret = pg_snprintf(error, sizeof(error), "%s (%s)",
+					  PR_ErrorToString(errcode, PR_LANGUAGE_I_DEFAULT),
+					  PR_ErrorToName(errcode));
+	if (ret)
+		return pstrdup(error);
+
+	return pstrdup(_("unknown TLS error"));
+}
diff --git a/src/backend/libpq/be-secure.c b/src/backend/libpq/be-secure.c
index 2ae507a902..f39977b80c 100644
--- a/src/backend/libpq/be-secure.c
+++ b/src/backend/libpq/be-secure.c
@@ -49,6 +49,9 @@ bool		ssl_passphrase_command_supports_reload;
 #ifdef USE_SSL
 bool		ssl_loaded_verify_locations = false;
 #endif
+#ifdef USE_NSS
+char	   *ssl_database;
+#endif
 
 /* GUC variable controlling SSL cipher list */
 char	   *SSLCipherSuites = NULL;
diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c
index 031ca0327f..ac11db7575 100644
--- a/src/backend/utils/misc/guc.c
+++ b/src/backend/utils/misc/guc.c
@@ -4233,7 +4233,11 @@ static struct config_string ConfigureNamesString[] =
 		},
 		&ssl_library,
 #ifdef USE_SSL
+#if defined(USE_OPENSSL)
 		"OpenSSL",
+#elif defined(USE_NSS)
+		"NSS",
+#endif
 #else
 		"",
 #endif
@@ -4291,6 +4295,18 @@ static struct config_string ConfigureNamesString[] =
 		check_canonical_path, assign_pgstat_temp_directory, NULL
 	},
 
+#ifdef USE_NSS
+	{
+		{"ssl_database", PGC_SIGHUP, CONN_AUTH_SSL,
+			gettext_noop("Location of the NSS certificate database."),
+			NULL
+		},
+		&ssl_database,
+		"",
+		NULL, NULL, NULL
+	},
+#endif
+
 	{
 		{"synchronous_standby_names", PGC_SIGHUP, REPLICATION_PRIMARY,
 			gettext_noop("Number of synchronous standbys and list of names of potential synchronous ones."),
@@ -4319,8 +4335,10 @@ static struct config_string ConfigureNamesString[] =
 			GUC_SUPERUSER_ONLY
 		},
 		&SSLCipherSuites,
-#ifdef USE_OPENSSL
+#if defined(USE_OPENSSL)
 		"HIGH:MEDIUM:+3DES:!aNULL",
+#elif defined (USE_NSS)
+		"",
 #else
 		"none",
 #endif
diff --git a/src/include/common/pg_nss.h b/src/include/common/pg_nss.h
new file mode 100644
index 0000000000..38249314d5
--- /dev/null
+++ b/src/include/common/pg_nss.h
@@ -0,0 +1,141 @@
+/*-------------------------------------------------------------------------
+ *
+ * pg_nss.h
+ *	  Support for NSS as a TLS backend
+ *
+ * These definitions are used by both frontend and backend code.
+ *
+ * Copyright (c) 2020, PostgreSQL Global Development Group
+ *
+ * IDENTIFICATION
+ *        src/include/common/pg_nss.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef PG_NSS_H
+#define PG_NSS_H
+
+#ifdef USE_NSS
+
+#include <sslproto.h>
+
+PRUint16 pg_find_cipher(char *name);
+
+typedef struct
+{
+	const char     *name;
+	PRUint16        number;
+} NSSCiphers;
+
+#define INVALID_CIPHER	0xFFFF
+
+/*
+ * This list is a partial copy of the ciphers in NSS files lib/ssl/sslproto.h
+ * in order to provide a human readable version of the ciphers. It would be
+ * nice to not have to have this, but NSS doesn't provide any API addressing
+ * the ciphers by name. TODO: do we want more of the ciphers, or perhaps less?
+ */
+static const NSSCiphers NSS_CipherList[] = {
+
+	{"TLS_NULL_WITH_NULL_NULL", TLS_NULL_WITH_NULL_NULL},
+
+	{"TLS_RSA_WITH_NULL_MD5", TLS_RSA_WITH_NULL_MD5},
+	{"TLS_RSA_WITH_NULL_SHA", TLS_RSA_WITH_NULL_SHA},
+	{"TLS_RSA_WITH_RC4_128_MD5", TLS_RSA_WITH_RC4_128_MD5},
+	{"TLS_RSA_WITH_RC4_128_SHA", TLS_RSA_WITH_RC4_128_SHA},
+	{"TLS_RSA_WITH_IDEA_CBC_SHA", TLS_RSA_WITH_IDEA_CBC_SHA},
+	{"TLS_RSA_WITH_DES_CBC_SHA", TLS_RSA_WITH_DES_CBC_SHA},
+	{"TLS_RSA_WITH_3DES_EDE_CBC_SHA", TLS_RSA_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_DH_DSS_WITH_DES_CBC_SHA", TLS_DH_DSS_WITH_DES_CBC_SHA},
+	{"TLS_DH_DSS_WITH_3DES_EDE_CBC_SHA", TLS_DH_DSS_WITH_3DES_EDE_CBC_SHA},
+	{"TLS_DH_RSA_WITH_DES_CBC_SHA", TLS_DH_RSA_WITH_DES_CBC_SHA},
+	{"TLS_DH_RSA_WITH_3DES_EDE_CBC_SHA", TLS_DH_RSA_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_DHE_DSS_WITH_DES_CBC_SHA", TLS_DHE_DSS_WITH_DES_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_3DES_EDE_CBC_SHA", TLS_DHE_DSS_WITH_3DES_EDE_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_DES_CBC_SHA", TLS_DHE_RSA_WITH_DES_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA", TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_DH_anon_WITH_RC4_128_MD5", TLS_DH_anon_WITH_RC4_128_MD5},
+	{"TLS_DH_anon_WITH_DES_CBC_SHA", TLS_DH_anon_WITH_DES_CBC_SHA},
+	{"TLS_DH_anon_WITH_3DES_EDE_CBC_SHA", TLS_DH_anon_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_RSA_WITH_AES_128_CBC_SHA", TLS_RSA_WITH_AES_128_CBC_SHA},
+	{"TLS_DH_DSS_WITH_AES_128_CBC_SHA", TLS_DH_DSS_WITH_AES_128_CBC_SHA},
+	{"TLS_DH_RSA_WITH_AES_128_CBC_SHA", TLS_DH_RSA_WITH_AES_128_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_AES_128_CBC_SHA", TLS_DHE_DSS_WITH_AES_128_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_AES_128_CBC_SHA", TLS_DHE_RSA_WITH_AES_128_CBC_SHA},
+	{"TLS_DH_anon_WITH_AES_128_CBC_SHA", TLS_DH_anon_WITH_AES_128_CBC_SHA},
+
+	{"TLS_RSA_WITH_AES_256_CBC_SHA", TLS_RSA_WITH_AES_256_CBC_SHA},
+	{"TLS_DH_DSS_WITH_AES_256_CBC_SHA", TLS_DH_DSS_WITH_AES_256_CBC_SHA},
+	{"TLS_DH_RSA_WITH_AES_256_CBC_SHA", TLS_DH_RSA_WITH_AES_256_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_AES_256_CBC_SHA", TLS_DHE_DSS_WITH_AES_256_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_AES_256_CBC_SHA", TLS_DHE_RSA_WITH_AES_256_CBC_SHA},
+	{"TLS_DH_anon_WITH_AES_256_CBC_SHA", TLS_DH_anon_WITH_AES_256_CBC_SHA},
+	{"TLS_RSA_WITH_NULL_SHA256", TLS_RSA_WITH_NULL_SHA256},
+	{"TLS_RSA_WITH_AES_128_CBC_SHA256", TLS_RSA_WITH_AES_128_CBC_SHA256},
+	{"TLS_RSA_WITH_AES_256_CBC_SHA256", TLS_RSA_WITH_AES_256_CBC_SHA256},
+
+	{"TLS_DHE_DSS_WITH_AES_128_CBC_SHA256", TLS_DHE_DSS_WITH_AES_128_CBC_SHA256},
+	{"TLS_RSA_WITH_CAMELLIA_128_CBC_SHA", TLS_RSA_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DH_DSS_WITH_CAMELLIA_128_CBC_SHA", TLS_DH_DSS_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DH_RSA_WITH_CAMELLIA_128_CBC_SHA", TLS_DH_RSA_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_CAMELLIA_128_CBC_SHA", TLS_DHE_DSS_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA", TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DH_anon_WITH_CAMELLIA_128_CBC_SHA", TLS_DH_anon_WITH_CAMELLIA_128_CBC_SHA},
+
+	{"TLS_DHE_DSS_WITH_RC4_128_SHA", TLS_DHE_DSS_WITH_RC4_128_SHA},
+	{"TLS_DHE_RSA_WITH_AES_128_CBC_SHA256", TLS_DHE_RSA_WITH_AES_128_CBC_SHA256},
+	{"TLS_DHE_DSS_WITH_AES_256_CBC_SHA256", TLS_DHE_DSS_WITH_AES_256_CBC_SHA256},
+	{"TLS_DHE_RSA_WITH_AES_256_CBC_SHA256", TLS_DHE_RSA_WITH_AES_256_CBC_SHA256},
+
+	{"TLS_RSA_WITH_CAMELLIA_256_CBC_SHA", TLS_RSA_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DH_DSS_WITH_CAMELLIA_256_CBC_SHA", TLS_DH_DSS_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DH_RSA_WITH_CAMELLIA_256_CBC_SHA", TLS_DH_RSA_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_CAMELLIA_256_CBC_SHA", TLS_DHE_DSS_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA", TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DH_anon_WITH_CAMELLIA_256_CBC_SHA", TLS_DH_anon_WITH_CAMELLIA_256_CBC_SHA},
+
+	{"TLS_RSA_WITH_SEED_CBC_SHA", TLS_RSA_WITH_SEED_CBC_SHA},
+
+	{"TLS_RSA_WITH_AES_128_GCM_SHA256", TLS_RSA_WITH_AES_128_GCM_SHA256},
+	{"TLS_RSA_WITH_AES_256_GCM_SHA384", TLS_RSA_WITH_AES_256_GCM_SHA384},
+	{"TLS_DHE_RSA_WITH_AES_128_GCM_SHA256", TLS_DHE_RSA_WITH_AES_128_GCM_SHA256},
+	{"TLS_DHE_RSA_WITH_AES_256_GCM_SHA384", TLS_DHE_RSA_WITH_AES_256_GCM_SHA384},
+	{"TLS_DHE_DSS_WITH_AES_128_GCM_SHA256", TLS_DHE_DSS_WITH_AES_128_GCM_SHA256},
+	{"TLS_DHE_DSS_WITH_AES_256_GCM_SHA384", TLS_DHE_DSS_WITH_AES_256_GCM_SHA384},
+
+	{"TLS_AES_128_GCM_SHA256", TLS_AES_128_GCM_SHA256},
+	{"TLS_AES_256_GCM_SHA384", TLS_AES_256_GCM_SHA384},
+	{"TLS_CHACHA20_POLY1305_SHA256", TLS_CHACHA20_POLY1305_SHA256},
+	{NULL, 0}
+};
+
+/*
+ * pg_find_cipher
+ *			Translate an NSS ciphername to the cipher code
+ *
+ * Searches the configured ciphers for the corresponding cipher code to the
+ * name. Search is performed case insensitive.
+ */
+PRUint16
+pg_find_cipher(char *name)
+{
+	const NSSCiphers	*cipher_list = NSS_CipherList;
+
+	while (cipher_list->name)
+	{
+		if (pg_strcasecmp(cipher_list->name, name) == 0)
+			return cipher_list->number;
+
+		cipher_list++;
+	}
+
+	return 0xFFFF;
+}
+
+#endif							/* USE_NSS */
+
+#endif							/* PG_NSS_H */
diff --git a/src/include/libpq/libpq-be.h b/src/include/libpq/libpq-be.h
index 179ebaa104..fc2f16d847 100644
--- a/src/include/libpq/libpq-be.h
+++ b/src/include/libpq/libpq-be.h
@@ -192,13 +192,18 @@ typedef struct Port
 	bool		peer_cert_valid;
 
 	/*
-	 * OpenSSL structures. (Keep these last so that the locations of other
-	 * fields are the same whether or not you build with OpenSSL.)
+	 * SSL backend specific structures. (Keep these last so that the locations
+	 * of other fields are the same whether or not you build with SSL enabled.)
 	 */
 #ifdef USE_OPENSSL
 	SSL		   *ssl;
 	X509	   *peer;
 #endif
+
+#ifdef USE_NSS
+	//void	   *ssl;
+	void	   *pr_fd;
+#endif
 } Port;
 
 #ifdef USE_SSL
diff --git a/src/include/libpq/libpq.h b/src/include/libpq/libpq.h
index b1152475ac..298d87ecae 100644
--- a/src/include/libpq/libpq.h
+++ b/src/include/libpq/libpq.h
@@ -88,6 +88,9 @@ extern PGDLLIMPORT bool ssl_passphrase_command_supports_reload;
 #ifdef USE_SSL
 extern bool ssl_loaded_verify_locations;
 #endif
+#ifdef USE_NSS
+extern char *ssl_database;
+#endif
 
 extern int	secure_initialize(bool isServerStart);
 extern bool secure_loaded_verify_locations(void);
diff --git a/src/include/pg_config.h.in b/src/include/pg_config.h.in
index c199cd46d2..dba1443758 100644
--- a/src/include/pg_config.h.in
+++ b/src/include/pg_config.h.in
@@ -889,6 +889,9 @@
 /* Define to 1 to build with PAM support. (--with-pam) */
 #undef USE_PAM
 
+/* Define to build with NSS support (--with-nss) */
+#undef USE_NSS
+
 /* Define to 1 to use software CRC-32C implementation (slicing-by-8). */
 #undef USE_SLICING_BY_8_CRC32C
 
diff --git a/src/include/pg_config_manual.h b/src/include/pg_config_manual.h
index 8f3ec6bde1..2a5b59b998 100644
--- a/src/include/pg_config_manual.h
+++ b/src/include/pg_config_manual.h
@@ -176,10 +176,9 @@
 
 /*
  * USE_SSL code should be compiled only when compiling with an SSL
- * implementation.  (Currently, only OpenSSL is supported, but we might add
- * more implementations in the future.)
+ * implementation.
  */
-#ifdef USE_OPENSSL
+#if defined(USE_OPENSSL) || defined(USE_NSS)
 #define USE_SSL
 #endif
 
diff --git a/src/interfaces/libpq/Makefile b/src/interfaces/libpq/Makefile
index d4919970f8..97821fb39b 100644
--- a/src/interfaces/libpq/Makefile
+++ b/src/interfaces/libpq/Makefile
@@ -57,6 +57,10 @@ OBJS += \
 	fe-secure-gssapi.o
 endif
 
+ifeq ($(with_nss), yes)
+OBJS += fe-secure-nss.o
+endif
+
 ifeq ($(PORTNAME), cygwin)
 override shlib = cyg$(NAME)$(DLSUFFIX)
 endif
diff --git a/src/interfaces/libpq/fe-connect.c b/src/interfaces/libpq/fe-connect.c
index 7bee9dd201..2814eb8ddd 100644
--- a/src/interfaces/libpq/fe-connect.c
+++ b/src/interfaces/libpq/fe-connect.c
@@ -354,6 +354,10 @@ static const internalPQconninfoOption PQconninfoOptions[] = {
 		"Target-Session-Attrs", "", 11, /* sizeof("read-write") = 11 */
 	offsetof(struct pg_conn, target_session_attrs)},
 
+	{"cert_database", NULL, NULL, NULL,
+		"CertificateDatabase", "", 64,
+	offsetof(struct pg_conn, cert_database)},
+
 	/* Terminating entry --- MUST BE LAST */
 	{NULL, NULL, NULL, NULL,
 	NULL, NULL, 0}
diff --git a/src/interfaces/libpq/fe-secure-nss.c b/src/interfaces/libpq/fe-secure-nss.c
new file mode 100644
index 0000000000..863c58f20b
--- /dev/null
+++ b/src/interfaces/libpq/fe-secure-nss.c
@@ -0,0 +1,959 @@
+/*-------------------------------------------------------------------------
+ *
+ * fe-secure-nss.c
+ *	  functions for supporting NSS as a TLS backend for frontend libpq
+ *
+ * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ *	  src/interfaces/libpq/fe-secure-nss.c
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#include "postgres_fe.h"
+
+#include "libpq-fe.h"
+#include "fe-auth.h"
+#include "libpq-int.h"
+
+/*
+ * BITS_PER_BYTE is also defined in the NSPR header fils, so we need to undef
+ * our version to avoid compiler warnings on redefinition.
+ */
+#define pg_BITS_PER_BYTE BITS_PER_BYTE
+#undef BITS_PER_BYTE
+
+/*
+ * The nspr/obsolete/protypes.h NSPR header typedefs uint64 and int64 with
+ * colliding definitions from ours, causing a much expected compiler error.
+ * The definitions are however not actually used in NSPR at all, and are only
+ * intended for what seems to be backwards compatibility for apps written
+ * against old versions of NSPR.  The following comment is in the referenced
+ * file, and was added in 1998:
+ *
+ *		This section typedefs the old 'native' types to the new PR<type>s.
+ *		These definitions are scheduled to be eliminated at the earliest
+ *		possible time. The NSPR API is implemented and documented using
+ *		the new definitions.
+ *
+ * As there is no opt-out from pulling in these typedefs, we define the guard
+ * for the file to exclude it. This is incredibly ugly, but seems to be about
+ * the only way around it.
+ */
+#define PROTYPES_H
+#include <nspr.h>
+#undef PROTYPES_H
+#include <nss.h>
+#include <ssl.h>
+#include <sslproto.h>
+#include <pk11func.h>
+#include <prerror.h>
+#include <prinit.h>
+#include <prio.h>
+#include <secerr.h>
+#include <secmod.h>
+
+/*
+ * Ensure that the colliding definitions match, else throw an error. In case
+ * NSPR remove the definition in a future version (however unlikely that may
+ * be, make sure to put ours back again.
+ */
+#if defined(BITS_PER_BYTE)
+#  if BITS_PER_BYTE != pg_BITS_PER_BYTE
+#    error "incompatible byte widths between NSPR and PostgreSQL"
+#  endif
+#else
+#  define BITS_PER_BYTE pg_BITS_PER_BYTE
+#endif
+#undef pg_BITS_PER_BYTE
+
+static SECStatus pg_load_nss_module(SECMODModule **module, const char *library, const char *name);
+static SECStatus pg_bad_cert_handler(void *arg, PRFileDesc *fd);
+static char *pg_SSLerrmessage(PRErrorCode errcode);
+static SECStatus pg_client_auth_handler(void *arg, PRFileDesc *socket, CERTDistNames *caNames,
+					CERTCertificate **pRetCert, SECKEYPrivateKey **pRetKey);
+static SECStatus pg_cert_auth_handler(void *arg, PRFileDesc *fd, PRBool checksig, PRBool isServer);
+static int ssl_protocol_version_to_nss(const char *protocol);
+static bool cert_database_has_CA(PGconn *conn);
+
+static char *PQssl_passwd_cb(PK11SlotInfo *slot, PRBool retry, void *arg);
+
+/*
+ * PR_ImportTCPSocket() is a private API, but very widely used, as it's the
+ * only way to make NSS use an already set up POSIX file descriptor rather
+ * than opening one itself. To quote the NSS documentation:
+ *
+ *		"In theory, code that uses PR_ImportTCPSocket may break when NSPR's
+ *		implementation changes. In practice, this is unlikely to happen because
+ *		NSPR's implementation has been stable for years and because of NSPR's
+ *		strong commitment to backward compatibility."
+ *
+ * https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSPR/Reference/PR_ImportTCPSocket
+ *
+ * The function is declared in <private/pprio.h>, but as it is a header marked
+ * private we declare it here rather than including it.
+ */
+NSPR_API(PRFileDesc*) PR_ImportTCPSocket(int);
+
+static SECMODModule *ca_trust = NULL;
+static NSSInitContext *nss_context = NULL;
+
+/*
+ * Track whether the NSS database has a password set or not. There is no API
+ * function for retrieving password status, so we simply flip this to true in
+ * case NSS invoked the password callback - as that will only happen in case
+ * there is a password. The reason for tracking this is that there are calls
+ * which require a password parameter, but doesn't use the callbacks provided,
+ * so we must call the callback on behalf of these.
+ */
+static bool has_password = false;
+
+#if defined(WIN32)
+static const char *ca_trust_name = "nssckbi.dll";
+#elif defined(__darwin__)
+static const char *ca_trust_name = "libnssckbi.dylib";
+#else
+static const char *ca_trust_name = "libnssckbi.so";
+#endif
+
+static PQsslKeyPassHook_type_nss PQsslKeyPassHook = NULL;
+
+/* ------------------------------------------------------------ */
+/*			 Procedures common to all secure sessions			*/
+/* ------------------------------------------------------------ */
+
+void
+pgtls_init_library(bool do_ssl, int do_crypto)
+{
+	/* TODO: implement me .. */
+}
+
+int
+pgtls_init(PGconn *conn)
+{
+	conn->ssl_in_use = false;
+
+	return 0;
+}
+
+void
+pgtls_close(PGconn *conn)
+{
+	if (nss_context)
+	{
+		NSS_ShutdownContext(nss_context);
+		nss_context = NULL;
+	}
+}
+
+PostgresPollingStatusType
+pgtls_open_client(PGconn *conn)
+{
+	SECStatus				status;
+	PRFileDesc			   *pr_fd;
+	PRFileDesc			   *model;
+	NSSInitParameters		params;
+	SSLVersionRange			desired_range;
+
+	/*
+	 * The NSPR documentation states that runtime initialization via PR_Init is
+	 * no longer required, as the first caller into NSPR will perform the
+	 * initialization implicitly. The documentation doesn't however clarify
+	 * from which version this is holds true, so let's perform the potentially
+	 * superfluous initialization anyways to avoid crashing on older versions
+	 * of NSPR, as there is no difference in overhead.  The NSS documentation
+	 * still states that PR_Init must be called in some way (implicitly or
+	 * explicitly).
+	 *
+	 * The below parameters are what the implicit initialization would've done
+	 * for us, and should work even for older versions where it might not be
+	 * done automatically. The last parameter, maxPTDs, is set to various
+	 * values in other codebases, but has been unused since NSPR 2.1 which was
+	 * released sometime in 1998.
+	 */
+	PR_Init(PR_USER_THREAD, PR_PRIORITY_NORMAL, 0);
+
+	/*
+	 * The original design of NSS was for a single application to use a single
+	 * copy of it, initialized with NSS_Initialize() which isn't returning any
+	 * handle with which to refer to NSS. NSS initialization and shutdown are
+	 * global for the application, so a shutdown in another NSS enabled library
+	 * would cause NSS to be stopped for libpq as well.  The fix has been to
+	 * introduce NSS_InitContext which returns a context handle to pass to
+	 * NSS_ShutdownContext.  NSS_InitContext was introduced in NSS 3.12, but
+	 * the use of it is not very well documented.
+	 * https://bugzilla.redhat.com/show_bug.cgi?id=738456
+	 *
+	 * The InitParameters struct passed can be used to override internal values
+	 * in NSS, but the usage is not documented at all. When using NSS_Init
+	 * initializations, the values are instead set via PK11_Configure calls so
+	 * the PK11_Configure documentation can be used to glean some details on
+	 * these.
+	 *
+	 * https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS/PKCS11/Module_Specs
+	 */
+	memset(&params, 0, sizeof(params));
+	params.length = sizeof(params);
+
+	if (conn->cert_database && strlen(conn->cert_database) > 0)
+	{
+		char *cert_database_path = psprintf("sql:%s", conn->cert_database);
+
+		nss_context = NSS_InitContext(cert_database_path, "", "", "",
+									  &params,
+									  NSS_INIT_READONLY | NSS_INIT_PK11RELOAD);
+		pfree(cert_database_path);
+	}
+	else
+		nss_context = NSS_InitContext("", "", "", "", &params,
+									  NSS_INIT_READONLY | NSS_INIT_NOCERTDB |
+									  NSS_INIT_NOMODDB | NSS_INIT_FORCEOPEN |
+									  NSS_INIT_NOROOTINIT | NSS_INIT_PK11RELOAD);
+
+	if (!nss_context)
+	{
+		char		*err = pg_SSLerrmessage(PR_GetError());
+
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to %s certificate database: %s"),
+										conn->cert_database ? "open" : "create",
+										err);
+		free(err);
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * Configure cipher policy.
+	 */
+	status = NSS_SetDomesticPolicy();
+	if (status != SECSuccess)
+	{
+		char		*err = pg_SSLerrmessage(PR_GetError());
+
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to configure cipher policy: %s"),
+										err);
+		free(err);
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * If we don't have a certificate database, the system trust store is the
+	 * fallback we can use. If we fail to initialize that as well, we can still
+	 * attempt a connection as long as the sslmode isn't verify*.
+	 */
+	if (!conn->cert_database && conn->sslmode[0] == 'v')
+	{
+		status = pg_load_nss_module(&ca_trust, ca_trust_name, "\"Root Certificates\"");
+		//status = pg_load_nss_module(&ca_trust, ca_trust_name, "trust");
+		if (status != SECSuccess)
+		{
+			char *err = pg_SSLerrmessage(PR_GetError());
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("WARNING: unable to load NSS trust module \"%s\" : %s"), ca_trust_name, err);
+			return PGRES_POLLING_FAILED;
+		}
+	}
+
+
+	PK11_SetPasswordFunc(PQssl_passwd_cb);
+
+	/*
+	 * Import the already opened socket as we don't want to use NSPR functions
+	 * for opening the network socket due to how the PostgreSQL protocol works
+	 * with TLS connections. This function is not part of the NSPR public API,
+	 * see the comment at the top of the file for the rationale of still using
+	 * it.
+	 */
+	pr_fd = PR_ImportTCPSocket(conn->sock);
+	if (!pr_fd)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to attach to socket: %s"),
+										pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * Most of the documentation available, and implementations of, NSS/NSPR
+	 * use the PR_NewTCPSocket() function here, which has the drawback that it
+	 * can only create IPv4 sockets. Instead use PR_OpenTCPSocket() which copes
+	 * with IPv6 as well.
+	 */
+	model = SSL_ImportFD(NULL, PR_OpenTCPSocket(conn->laddr.addr.ss_family));
+	if (!model)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to enable TLS: %s"),
+										pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/* Disable old protocol versions (SSLv2 and SSLv3) */
+	SSL_OptionSet(model, SSL_ENABLE_SSL2, PR_FALSE);
+	SSL_OptionSet(model, SSL_V2_COMPATIBLE_HELLO, PR_FALSE);
+	SSL_OptionSet(model, SSL_ENABLE_SSL3, PR_FALSE);
+
+#ifdef SSL_CBC_RANDOM_IV
+	/*
+	 * Enable protection against the BEAST attack in case the NSS library has
+	 * support for that. While SSLv3 is disabled, we may still allow TLSv1
+	 * which is affected. The option isn't documented as an SSL option, but as
+	 * an NSS environment variable.
+	 */
+	SSL_OptionSet(model, SSL_CBC_RANDOM_IV, PR_TRUE);
+#endif
+
+	/* Set us up as a TLS client for the handshake */
+	SSL_OptionSet(model, SSL_HANDSHAKE_AS_CLIENT, PR_TRUE);
+
+	/*
+	 * When setting the available protocols, we either use the user defined
+	 * configuration values, and if missing we accept whatever is the highest
+	 * version supported by the library as the max and only limit the range in
+	 * the other end at TLSv1.0. ssl_variant_stream is a ProtocolVariant enum
+	 * for Stream protocols, rather than datagram.
+	 */
+	SSL_VersionRangeGetSupported(ssl_variant_stream, &desired_range);
+	desired_range.min = SSL_LIBRARY_VERSION_TLS_1_0;
+
+	if (conn->ssl_min_protocol_version && strlen(conn->ssl_min_protocol_version) > 0)
+	{
+		int ssl_min_ver = ssl_protocol_version_to_nss(conn->ssl_min_protocol_version);
+
+		if (ssl_min_ver == -1)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("invalid value \"%s\" for minimum version of SSL protocol\n"),
+							  conn->ssl_min_protocol_version);
+			return -1;
+		}
+
+		desired_range.min = ssl_min_ver;
+	}
+
+	if (conn->ssl_max_protocol_version && strlen(conn->ssl_max_protocol_version) > 0)
+	{
+		int ssl_max_ver = ssl_protocol_version_to_nss(conn->ssl_max_protocol_version);
+
+		if (ssl_max_ver == -1)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("invalid value \"%s\" for maximum version of SSL protocol\n"),
+							  conn->ssl_max_protocol_version);
+			return -1;
+		}
+
+		desired_range.max = ssl_max_ver;
+	}
+
+	if (SSL_VersionRangeSet(model, &desired_range) != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to set allowed SSL protocol version range: %s"),
+										pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * Set up callback for verifying server certificates, as well as for how
+	 * to handle failed verifications.
+	 */
+	SSL_AuthCertificateHook(model, pg_cert_auth_handler, (void *) conn);
+	SSL_BadCertHook(model, pg_bad_cert_handler, (void *) conn);
+
+	/*
+	 * Convert the NSPR socket to an SSL socket. Ensuring the success of this
+	 * operation is critical as NSS SSL_* functions may return SECSuccess on
+	 * the socket even though SSL hasn't been enabled, which introduce a risk
+	 * of silent downgrades.
+	 */
+	conn->pr_fd = SSL_ImportFD(model, pr_fd);
+	if (!conn->pr_fd)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to configure client for TLS: %s"),
+										pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * The model can now we closed as we've applied the settings of the model
+	 * onto the real socket. From hereon we should only use conn->pr_fd.
+	 */
+	PR_Close(model);
+
+	/* Set the private data to be passed to the password callback */
+	SSL_SetPKCS11PinArg(conn->pr_fd, (void *) conn);
+
+	/*
+	 * If a CRL file has been specified, verify if it exists in the database
+	 * but don't fail in case it doesn't.
+	 */
+	if (conn->sslcrl && strlen(conn->sslcrl) > 0)
+	{
+		/* XXX: Implement me.. */
+	}
+
+	status = SSL_ResetHandshake(conn->pr_fd, PR_FALSE);
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to initiate handshake: %s"),
+										pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * Set callback for client authentication when requested by the server.
+	 */
+	SSL_GetClientAuthDataHook(conn->pr_fd, pg_client_auth_handler, (void *) conn);
+
+	/*
+	 * Specify which hostname we are expecting to talk to. This is required,
+	 * albeit mostly applies to when opening a connection to a traditional
+	 * http server it seems.
+	 */
+	SSL_SetURL(conn->pr_fd, (conn->connhost[conn->whichhost]).host);
+
+	do
+	{
+		status = SSL_ForceHandshake(conn->pr_fd);
+	}
+	while (status != SECSuccess && PR_GetError() == PR_WOULD_BLOCK_ERROR);
+
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("SSL error: %s"),
+										pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	conn->ssl_in_use = true;
+	return PGRES_POLLING_OK;
+}
+
+ssize_t
+pgtls_read(PGconn *conn, void *ptr, size_t len)
+{
+	PRInt32			nread;
+	PRErrorCode		status;
+	int				read_errno = 0;
+
+	nread = PR_Recv(conn->pr_fd, ptr, len, 0, PR_INTERVAL_NO_WAIT);
+
+	/*
+	 * PR_Recv blocks until there is data to read or the timeout expires. Zero
+	 * is returned for closed connections, while -1 indicates an error within
+	 * the ongoing connection.
+	 */
+	if (nread == 0)
+	{
+		read_errno = ECONNRESET;
+		return -1;
+	}
+
+	if (nread == -1)
+	{
+		status = PR_GetError();
+
+		switch(status)
+		{
+			case PR_WOULD_BLOCK_ERROR:
+				read_errno = EINTR;
+				break;
+
+			case PR_IO_TIMEOUT_ERROR:
+				break;
+			/*
+			 * The error cases for PR_Recv are not documented, but can be
+			 * reverse engineered from _MD_unix_map_default_error() in the
+			 * NSPR code, defined in pr/src/md/unix/unix_errors.c.
+			 */
+			default:
+				printfPQExpBuffer(&conn->errorMessage,
+								  libpq_gettext("TLS read error: %s"),
+												pg_SSLerrmessage(status));
+				break;
+		}
+	}
+
+	SOCK_ERRNO_SET(read_errno);
+	return (ssize_t) nread;
+}
+
+/*
+ * pgtls_read_pending
+ *		Check for the existence of data to be read.
+ *
+ * This is part of the PostgreSQL TLS backend API.
+ */
+bool
+pgtls_read_pending(PGconn *conn)
+{
+	unsigned char	c;
+	int				n;
+
+	/*
+	 * PR_Recv peeks into the stream with the timeount turned off, to see if
+	 * there is another byte to read off the wire. There is an NSS function
+	 * SSL_DataPending() which might seem like a better fit, but it will only
+	 * check already encrypted data in the SSL buffer, not still unencrypted
+	 * data, thus it doesn't guarantee that a subsequent call to
+	 * PR_Read/PR_Recv wont block.
+	 */
+	n = PR_Recv(conn->pr_fd, &c, 1, PR_MSG_PEEK, PR_INTERVAL_NO_WAIT);
+	return (n > 0);
+}
+
+ssize_t
+pgtls_write(PGconn *conn, const void *ptr, size_t len)
+{
+	PRInt32			n;
+	PRErrorCode		status;
+	int				write_errno = 0;
+
+	n = PR_Write(conn->pr_fd, ptr, len);
+
+	if (n < 0)
+	{
+		status = PR_GetError();
+
+		switch(status)
+		{
+			case PR_WOULD_BLOCK_ERROR:
+#ifdef EAGAIN
+				write_errno = EAGAIN;
+#else
+				write_errno = EINTR;
+#endif
+				break;
+
+			default:
+				printfPQExpBuffer(&conn->errorMessage,
+								  libpq_gettext("TLS write error: %s"),
+												pg_SSLerrmessage(status));
+				write_errno = ECONNRESET;
+				break;
+		}
+	}
+
+	SOCK_ERRNO_SET(write_errno);
+	return (ssize_t) n;
+}
+
+/* ------------------------------------------------------------ */
+/*			PostgreSQL specific TLS support functions			*/
+/* ------------------------------------------------------------ */
+
+/*
+ * TODO: this a 99% copy of the same function in the backend, make these share
+ * a single implementation instead.
+ */
+static char *
+pg_SSLerrmessage(PRErrorCode errcode)
+{
+	const char *error;
+
+	error = PR_ErrorToName(errcode);
+	if (error)
+		return strdup(error);
+
+	return strdup("unknown TLS error");
+}
+
+static SECStatus
+pg_load_nss_module(SECMODModule **module, const char *library, const char *name)
+{
+	SECMODModule   *mod;
+	char		   *modulespec;
+
+	modulespec = psprintf("library=\"%s\", name=\"%s\"", library, name);
+
+	/*
+	 * Attempt to load the specified module. The second parameter is "parent"
+	 * which should always be NULL for application code. The third parameter
+	 * defines if loading should recurse which is only applicable when loading
+	 * a module from within another module. This hierarchy would have to be
+	 * defined in the modulespec, and since we don't support anything but
+	 * directly addressed modules we should pass PR_FALSE.
+	 */
+	mod = SECMOD_LoadUserModule(modulespec, NULL, PR_FALSE);
+	pfree(modulespec);
+
+	if (mod && mod->loaded)
+	{
+		*module = mod;
+		return SECSuccess;
+	}
+
+	SECMOD_DestroyModule(mod);
+	return SECFailure;
+}
+
+/* ------------------------------------------------------------ */
+/*						NSS Callbacks							*/
+/* ------------------------------------------------------------ */
+
+/*
+ * pg_cert_auth_handler
+ *			Callback for authenticating server certificate
+ *
+ * This is pretty much the same procedure as the SSL_AuthCertificate function
+ * provided by NSS, with the difference being server hostname validation. With
+ * SSL_AuthCertificate there is no way to do verify-ca, it only does the -full
+ * flavor of our sslmodes, so we need our own implementation.
+ */
+static SECStatus
+pg_cert_auth_handler(void *arg, PRFileDesc *fd, PRBool checksig, PRBool isServer)
+{
+	SECStatus			status;
+	PGconn			   *conn = (PGconn *) arg;
+	char			   *server_hostname = NULL;
+	CERTCertificate	   *server_cert;
+	void			   *pin;
+
+	Assert(!isServer);
+
+	pin = SSL_RevealPinArg(conn->pr_fd);
+	server_cert = SSL_PeerCertificate(conn->pr_fd);
+
+	status = CERT_VerifyCertificateNow((CERTCertDBHandle *) CERT_GetDefaultCertDB(), server_cert,
+									   checksig, certificateUsageSSLServer,
+									   pin, NULL);
+
+	/*
+	 * If we've already failed validation then there is no point in also
+	 * performing the hostname check for verify-full.
+	 */
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to verify certificate: %s"),
+										pg_SSLerrmessage(PR_GetError()));
+		goto done;
+	}
+
+	if (strcmp(conn->sslmode, "verify-full") == 0)
+	{
+		server_hostname = SSL_RevealURL(conn->pr_fd);
+		if (!server_hostname || server_hostname[0] == '\0')
+			goto done;
+
+		/*
+		 * CERT_VerifyCertName will internally perform RFC 2818 SubjectAltName
+		 * verification.
+		 */
+		status = CERT_VerifyCertName(server_cert, server_hostname);
+		if (status != SECSuccess)
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("unable to verify server hostname: %s"),
+											pg_SSLerrmessage(PR_GetError()));
+
+	}
+
+done:
+	if (server_hostname)
+		PR_Free(server_hostname);
+
+	CERT_DestroyCertificate(server_cert);
+	return status;
+}
+
+/*
+ * pg_client_auth_handler
+ *		Callback for client certificate validation
+ *
+ * The client auth callback is not on by default in NSS, so we need to invoke
+ * it ourselves to ensure we can do cert authentication. A TODO is to support
+ * running without a specified sslcert parameter. By retrieving all the certs
+ * via nickname from the cert database and see if we find one which apply with
+ * NSS_CmpCertChainWCANames() and PK11_FindKeyByAnyCert() we could support
+ * just running with a ssl database specified.
+ *
+ * For now, we use the default client certificate validation which requires a
+ * defined nickname to identify the cert in the database.
+ */
+static SECStatus
+pg_client_auth_handler(void *arg, PRFileDesc *socket, CERTDistNames *caNames,
+					   CERTCertificate **pRetCert, SECKEYPrivateKey **pRetKey)
+{
+	PGconn		   *conn = (PGconn *) arg;
+
+	return NSS_GetClientAuthData(conn->sslcert, socket, caNames, pRetCert, pRetKey);
+}
+
+/*
+ * pg_bad_cert_handler
+ *		Callback for failed certificate validation
+ *
+ * The TLS handshake will call this function iff the server certificate failed
+ * validation. Depending on the sslmode, we allow the connection anyways.
+ */
+static SECStatus
+pg_bad_cert_handler(void *arg, PRFileDesc *fd)
+{
+	PGconn		   *conn = (PGconn *) arg;
+	PRErrorCode		err;
+
+	/*
+	 * This really shouldn't happen, as we've the the PGconn object as our
+	 * callback data, and at the callsite we know it will be populated. That
+	 * being said, the NSS code itself performs this check even when it should
+	 * not be required so let's use the same belts with our suspenders.
+	 */
+	if (!arg)
+		return SECFailure;
+
+	/*
+	 * For sslmodes other than verify-full and verify-ca we don't perform peer
+	 * validation, so return immediately.  sslmode require with a database
+	 * specified which contains a CA certificate will work like verify-ca to be
+	 * compatible with the OpenSSL implementation.
+	 */
+	if (strcmp(conn->sslmode, "require") == 0)
+	{
+		if (conn->cert_database && strlen(conn->cert_database) > 0 && cert_database_has_CA(conn))
+			return SECFailure;
+	}
+	if (conn->sslmode[0] == 'v')
+		return SECFailure;
+
+	err = PORT_GetError();
+
+	/*
+	 * TODO: these are relevant error codes that can occur in certificate
+	 * validation, figure out which we dont want for require/prefer etc.
+	 */
+	switch (err)
+	{
+		case SEC_ERROR_INVALID_AVA:
+		case SEC_ERROR_INVALID_TIME:
+		case SEC_ERROR_BAD_SIGNATURE:
+		case SEC_ERROR_EXPIRED_CERTIFICATE:
+		case SEC_ERROR_UNKNOWN_ISSUER:
+		case SEC_ERROR_UNTRUSTED_ISSUER:
+		case SEC_ERROR_UNTRUSTED_CERT:
+		case SEC_ERROR_CERT_VALID:
+		case SEC_ERROR_EXPIRED_ISSUER_CERTIFICATE:
+		case SEC_ERROR_CRL_EXPIRED:
+		case SEC_ERROR_CRL_BAD_SIGNATURE:
+		case SEC_ERROR_EXTENSION_VALUE_INVALID:
+		case SEC_ERROR_CA_CERT_INVALID:
+		case SEC_ERROR_CERT_USAGES_INVALID:
+		case SEC_ERROR_UNKNOWN_CRITICAL_EXTENSION:
+			return SECSuccess;
+			break;
+		default:
+			return SECFailure;
+			break;
+	}
+
+	/* Unreachable */
+	return SECSuccess;
+}
+
+/* ------------------------------------------------------------ */
+/*					SSL information functions					*/
+/* ------------------------------------------------------------ */
+
+void *
+PQgetssl(PGconn *conn)
+{
+	/*
+	 * Always return NULL as this is legacy and defined to be equal to
+	 * PQsslStruct(conn, "OpenSSL"); This should ideally trigger a logged
+	 * warning somewhere as it's nonsensical to run in a non-OpenSSL build,
+	 * but the color of said bikeshed hasn't yet been determined.
+	 */
+	return NULL;
+}
+
+void *
+PQsslStruct(PGconn *conn, const char *struct_name)
+{
+	if (!conn)
+		return NULL;
+
+	/*
+	 * Return the underlying PRFileDesc which can be used to access information
+	 * on the connection details. There is no SSL context per se.
+	 */
+	if (strcmp(struct_name, "NSS") == 0)
+		return conn->pr_fd;
+	return NULL;
+}
+
+const char *const *
+PQsslAttributeNames(PGconn *conn)
+{
+	static const char *const result[] = {
+		"library",
+		"cipher",
+		"protocol",
+		"key_bits",
+		"compression",
+		NULL
+	};
+
+	return result;
+}
+
+const char *
+PQsslAttribute(PGconn *conn, const char *attribute_name)
+{
+	SECStatus			status;
+	SSLChannelInfo		channel;
+	SSLCipherSuiteInfo	suite;
+
+	if (!conn || !conn->pr_fd)
+		return NULL;
+
+	if (strcmp(attribute_name, "library") == 0)
+		return "NSS";
+
+	status = SSL_GetChannelInfo(conn->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+		return NULL;
+
+	status = SSL_GetCipherSuiteInfo(channel.cipherSuite, &suite, sizeof(suite));
+	if (status != SECSuccess)
+		return NULL;
+
+	if (strcmp(attribute_name, "cipher") == 0)
+		return suite.cipherSuiteName;
+
+	if (strcmp(attribute_name, "key_bits") == 0)
+	{
+		static char key_bits_str[8];
+
+		snprintf(key_bits_str, sizeof(key_bits_str), "%i", suite.effectiveKeyBits);
+		return key_bits_str;
+	}
+
+	if (strcmp(attribute_name, "protocol") == 0)
+	{
+		switch(channel.protocolVersion)
+		{
+#ifdef SSL_LIBRARY_VERSION_TLS_1_3
+			case SSL_LIBRARY_VERSION_TLS_1_3:
+				return "TLSv1.3";
+#endif
+#ifdef SSL_LIBRARY_VERSION_TLS_1_2
+			case SSL_LIBRARY_VERSION_TLS_1_2:
+				return "TLSv1.2";
+#endif
+#ifdef SSL_LIBRARY_VERSION_TLS_1_1
+			case SSL_LIBRARY_VERSION_TLS_1_1:
+				return "TLSv1.1";
+#endif
+			case SSL_LIBRARY_VERSION_TLS_1_0:
+				return "TLSv1.0";
+			default:
+				return "unknown";
+		}
+	}
+
+	/*
+	 * NSS disabled support for compression in version 3.33, and it was only
+	 * available for SSLv3 at that point anyways, so we can safely return off
+	 * here without checking.
+	 */
+	if (strcmp(attribute_name, "compression") == 0)
+		return "off";
+
+	return NULL;
+}
+
+static int
+ssl_protocol_version_to_nss(const char *protocol)
+{
+	if (pg_strcasecmp("TLSv1", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_0;
+
+#ifdef SSL_LIBRARY_VERSION_TLS_1_1
+	if (pg_strcasecmp("TLSv1.1", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_1;
+#endif
+
+#ifdef SSL_LIBRARY_VERSION_TLS_1_2
+	if (pg_strcasecmp("TLSv1.2", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_2;
+#endif
+
+#ifdef SSL_LIBRARY_VERSION_TLS_1_3
+	if (pg_strcasecmp("TLSv1.3", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_3;
+#endif
+
+	return -1;
+}
+
+static bool
+cert_database_has_CA(PGconn *conn)
+{
+	CERTCertList	   *certificates;
+	bool				hasCA;
+
+	/*
+	 * If the certificate database has a password we must provide it, since
+	 * this API doesn't invoke the standard password callback.
+	 */
+	if (has_password)
+		certificates = PK11_ListCerts(PK11CertListCA, PQssl_passwd_cb(NULL, PR_FALSE, (void *) conn));
+	else
+		certificates = PK11_ListCerts(PK11CertListCA, NULL);
+	hasCA = !CERT_LIST_EMPTY(certificates);
+	CERT_DestroyCertList(certificates);
+
+	return hasCA;
+}
+
+PQsslKeyPassHook_type_nss
+PQgetSSLKeyPassHook_nss(void)
+{
+	return PQsslKeyPassHook;
+}
+
+void
+PQsetSSLKeyPassHook_nss(PQsslKeyPassHook_type_nss hook)
+{
+	PQsslKeyPassHook = hook;
+}
+
+/*
+ * Supply a password to decrypt a client certificate.
+ *
+ * This must match NSS type PK11PasswordFunc.
+ */
+static char *
+PQssl_passwd_cb(PK11SlotInfo *slot, PRBool retry, void *arg)
+{
+	has_password = true;
+
+	if (PQsslKeyPassHook)
+		return PQsslKeyPassHook(slot, (PRBool) retry, arg);
+	else
+		return PQdefaultSSLKeyPassHook_nss(slot, retry, arg);
+}
+
+/*
+ * The default password handler callback.
+ */
+char *
+PQdefaultSSLKeyPassHook_nss(PK11SlotInfo *slot, PRBool retry, void *arg)
+{
+	PGconn *conn = (PGconn *) arg;
+
+	/*
+	 * If the password didn't work the first time there is no point in retrying
+	 * as it hasn't changed.
+	 */
+	if (retry != PR_TRUE && conn->sslpassword && strlen(conn->sslpassword) > 0)
+		return PORT_Strdup(conn->sslpassword);
+
+	return NULL;
+}
diff --git a/src/interfaces/libpq/libpq-fe.h b/src/interfaces/libpq/libpq-fe.h
index 3b6a9fbce3..1fc7e43cfd 100644
--- a/src/interfaces/libpq/libpq-fe.h
+++ b/src/interfaces/libpq/libpq-fe.h
@@ -625,6 +625,17 @@ extern PQsslKeyPassHook_OpenSSL_type PQgetSSLKeyPassHook_OpenSSL(void);
 extern void PQsetSSLKeyPassHook_OpenSSL(PQsslKeyPassHook_OpenSSL_type hook);
 extern int	PQdefaultSSLKeyPassHook_OpenSSL(char *buf, int size, PGconn *conn);
 
+/* == in fe-secure-nss.c === */
+typedef struct PK11SlotInfoStr PK11SlotInfo;
+typedef int PRIntn;
+typedef PRIntn PRBool;
+
+/* Support for overriding sslpassword handling with a callback. */
+typedef char *(*PQsslKeyPassHook_type_nss)(PK11SlotInfo *slot, PRBool retry, void *arg);
+extern PQsslKeyPassHook_type_nss PQgetSSLKeyPassHook_nss(void);
+extern void PQsetSSLKeyPassHook_nss(PQsslKeyPassHook_type_nss hook);
+extern char *PQdefaultSSLKeyPassHook_nss(PK11SlotInfo *slot, PRBool retry, void *arg);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/src/interfaces/libpq/libpq-int.h b/src/interfaces/libpq/libpq-int.h
index 1de91ae295..12717ca720 100644
--- a/src/interfaces/libpq/libpq-int.h
+++ b/src/interfaces/libpq/libpq-int.h
@@ -362,6 +362,7 @@ struct pg_conn
 	char	   *sslpassword;	/* client key file password */
 	char	   *sslrootcert;	/* root certificate filename */
 	char	   *sslcrl;			/* certificate revocation list filename */
+	char	   *cert_database;
 	char	   *requirepeer;	/* required peer credentials for local sockets */
 	char	   *gssencmode;		/* GSS mode (require,prefer,disable) */
 	char	   *krbsrvname;		/* Kerberos service name */
@@ -485,6 +486,10 @@ struct pg_conn
 								 * OpenSSL version changes */
 #endif
 #endif							/* USE_OPENSSL */
+
+#ifdef USE_NSS
+	void	   *pr_fd;
+#endif							/* USE_NSS */
 #endif							/* USE_SSL */
 
 #ifdef ENABLE_GSS
diff --git a/src/test/ssl/Makefile b/src/test/ssl/Makefile
index 777ee39413..b54e4f91f8 100644
--- a/src/test/ssl/Makefile
+++ b/src/test/ssl/Makefile
@@ -14,6 +14,7 @@ top_builddir = ../../..
 include $(top_builddir)/src/Makefile.global
 
 export with_openssl
+export with_nss
 
 CERTIFICATES := server_ca server-cn-and-alt-names \
 	server-cn-only server-single-alt-name server-multiple-alt-names \
@@ -30,6 +31,27 @@ SSLFILES := $(CERTIFICATES:%=ssl/%.key) $(CERTIFICATES:%=ssl/%.crt) \
 	ssl/client+client_ca.crt ssl/client-der.key \
 	ssl/client-encrypted-pem.key ssl/client-encrypted-der.key
 
+NSSFILES := ssl/nss/client_ca.crt.db \
+	ssl/nss/server_ca.crt.db \
+	ssl/nss/root+server_ca.crt.db \
+	ssl/nss/root+client_ca.crt.db \
+	ssl/nss/both-cas-1.crt.db \
+	ssl/nss/client.crt__client.key.db \
+	ssl/nss/client-revoked.crt__client-revoked.key.db \
+	ssl/nss/server-cn-only.crt__server-password.key.db \
+	ssl/nss/server-cn-only.crt__server-cn-only.key.db \
+	ssl/nss/root.crl \
+	ssl/nss/server.crl \
+	ssl/nss/client.crl \
+	ssl/nss/server-multiple-alt-names.crt__server-multiple-alt-names.key.db \
+	ssl/nss/server-single-alt-name.crt__server-single-alt-name.key.db \
+	ssl/nss/server-cn-and-alt-names.crt__server-cn-and-alt-names.key.db \
+	ssl/nss/server-no-names.crt__server-no-names.key.db \
+	ssl/nss/server-revoked.crt__server-revoked.key.db \
+	ssl/nss/root+client.crl \
+	ssl/nss/client+client_ca.crt__client.key.db \
+	ssl/nss/client.crt__client-encrypted-pem.key.db
+
 # This target re-generates all the key and certificate files. Usually we just
 # use the ones that are committed to the tree without rebuilding them.
 #
@@ -37,6 +59,9 @@ SSLFILES := $(CERTIFICATES:%=ssl/%.key) $(CERTIFICATES:%=ssl/%.crt) \
 #
 sslfiles: $(SSLFILES)
 
+# Generate NSS certificate databases corresponding to the OpenSSL certificates
+nssfiles: $(NSSFILES)
+
 # OpenSSL requires a directory to put all generated certificates in. We don't
 # use this for anything, but we need a location.
 ssl/new_certs_dir:
@@ -64,6 +89,11 @@ ssl/%_ca.crt: ssl/%_ca.key %_ca.config ssl/root_ca.crt ssl/new_certs_dir
 	rm ssl/temp_ca.crt ssl/temp_ca_signed.crt
 	echo "01" > ssl/$*_ca.srl
 
+ssl/nss/%_ca.crt.db: ssl/%_ca.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n $*_ca.crt -i ssl/$*_ca.crt -t "CT,C,C"
+
 # Server certificates, signed by server CA:
 ssl/server-%.crt: ssl/server-%.key ssl/server_ca.crt server-%.config
 	openssl req -new -key ssl/server-$*.key -out ssl/server-$*.csr -config server-$*.config
@@ -77,6 +107,74 @@ ssl/server-ss.crt: ssl/server-cn-only.key ssl/server-cn-only.crt server-cn-only.
 	openssl x509 -req -days 10000 -in ssl/server-ss.csr -signkey ssl/server-cn-only.key -out ssl/server-ss.crt  -extensions v3_req -extfile server-cn-only.config
 	rm ssl/server-ss.csr
 
+ssl/nss/server-cn-only.crt__server-password.key.db: ssl/server-cn-only.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-cn-only.crt -i ssl/server-cn-only.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-password.pfx -inkey ssl/server-password.key -in ssl/server-cn-only.crt -certfile ssl/server_ca.crt -passin 'pass:secret1' -passout pass:
+	pk12util -i ssl/nss/server-password.pfx -d $@ -W ''
+
+ssl/nss/server-cn-only.crt__server-cn-only.key.db: ssl/server-cn-only.crt ssl/server-cn-only.key
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-cn-only.crt -i ssl/server-cn-only.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-cn-only.pfx -inkey ssl/server-cn-only.key -in ssl/server-cn-only.crt -certfile ssl/server_ca.crt -passout pass:
+	pk12util -i ssl/nss/server-cn-only.pfx -d $@ -W ''
+
+ssl/nss/server-multiple-alt-names.crt__server-multiple-alt-names.key.db: ssl/server-multiple-alt-names.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-multiple-alt-names.crt -i ssl/server-multiple-alt-names.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-multiple-alt-names.pfx -inkey ssl/server-multiple-alt-names.key -in ssl/server-multiple-alt-names.crt -certfile ssl/server-multiple-alt-names.crt -passout pass:
+	pk12util -i ssl/nss/server-multiple-alt-names.pfx -d $@ -W ''
+
+ssl/nss/server-single-alt-name.crt__server-single-alt-name.key.db: ssl/server-single-alt-name.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-single-alt-name.crt -i ssl/server-single-alt-name.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-single-alt-name.pfx -inkey ssl/server-single-alt-name.key -in ssl/server-single-alt-name.crt -certfile ssl/server-single-alt-name.crt -passout pass:
+	pk12util -i ssl/nss/server-single-alt-name.pfx -d $@ -W ''
+
+ssl/nss/server-cn-and-alt-names.crt__server-cn-and-alt-names.key.db: ssl/server-cn-and-alt-names.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-cn-and-alt-names.crt -i ssl/server-cn-and-alt-names.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-cn-and-alt-names.pfx -inkey ssl/server-cn-and-alt-names.key -in ssl/server-cn-and-alt-names.crt -certfile ssl/server-cn-and-alt-names.crt -passout pass:
+	pk12util -i ssl/nss/server-cn-and-alt-names.pfx -d $@ -W ''
+
+ssl/nss/server-no-names.crt__server-no-names.key.db: ssl/server-no-names.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-no-names.crt -i ssl/server-no-names.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-no-names.pfx -inkey ssl/server-no-names.key -in ssl/server-no-names.crt -certfile ssl/server-no-names.crt -passout pass:
+	pk12util -i ssl/nss/server-no-names.pfx -d $@ -W ''
+
+ssl/nss/server-revoked.crt__server-revoked.key.db: ssl/server-revoked.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-revoked.crt -i ssl/server-revoked.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-revoked.pfx -inkey ssl/server-revoked.key -in ssl/server-revoked.crt -certfile ssl/server-revoked.crt -passout pass:
+	pk12util -i ssl/nss/server-revoked.pfx -d $@ -W ''
+
 # Password-protected version of server-cn-only.key
 ssl/server-password.key: ssl/server-cn-only.key
 	openssl rsa -aes256 -in $< -out $@ -passout 'pass:secret1'
@@ -88,6 +186,27 @@ ssl/client.crt: ssl/client.key ssl/client_ca.crt
 	openssl x509 -in ssl/temp.crt -out ssl/client.crt # to keep just the PEM cert
 	rm ssl/client.csr ssl/temp.crt
 
+# Client certificate, signed by client CA
+ssl/nss/client.crt__client.key.db: ssl/client.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/client.crt -i ssl/client.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root+client_ca.crt -i ssl/root+client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client.pfx -inkey ssl/client.key -in ssl/client.crt -certfile ssl/client_ca.crt -passout pass:
+	pk12util -i ssl/nss/client.pfx -d $@ -W ''
+
+# Client certificate with encrypted key, signed by client CA
+ssl/nss/client.crt__client-encrypted-pem.key.db: ssl/client.crt
+	$(MKDIR_P) $@
+	echo 'dUmmyP^#+' > $@.pass
+	certutil -d "sql:$@" -N -f $@.pass
+	certutil -d "sql:$@" -A -f $@.pass -n ssl/client.crt -i ssl/client.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -f $@.pass -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -f $@.pass -n root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client-encrypted-pem.pfx -inkey ssl/client-encrypted-pem.key -in ssl/client.crt -certfile ssl/client_ca.crt -passin pass:'dUmmyP^#+' -passout pass:'dUmmyP^#+'
+	pk12util -i ssl/nss/client-encrypted-pem.pfx -d $@ -W 'dUmmyP^#+' -k $@.pass
+
 # Another client certificate, signed by the client CA. This one is revoked.
 ssl/client-revoked.crt: ssl/client-revoked.key ssl/client_ca.crt client.config
 	openssl req -new -key ssl/client-revoked.key -out ssl/client-revoked.csr -config client.config
@@ -95,6 +214,14 @@ ssl/client-revoked.crt: ssl/client-revoked.key ssl/client_ca.crt client.config
 	openssl x509 -in ssl/temp.crt -out ssl/client-revoked.crt # to keep just the PEM cert
 	rm ssl/client-revoked.csr ssl/temp.crt
 
+ssl/nss/client-revoked.crt__client-revoked.key.db: ssl/client-revoked.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/client-revoked.crt -i ssl/client-revoked.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client-revoked.pfx -inkey ssl/client-revoked.key -in ssl/client-revoked.crt -certfile ssl/client_ca.crt -passout pass:
+	pk12util -i ssl/nss/client-revoked.pfx -d $@ -W ''
+
 # Convert the key to DER, to test our behaviour there too
 ssl/client-der.key: ssl/client.key
 	openssl rsa -in ssl/client.key -outform DER -out ssl/client-der.key
@@ -112,6 +239,13 @@ ssl/client-encrypted-der.key: ssl/client.key
 ssl/both-cas-1.crt: ssl/root_ca.crt ssl/client_ca.crt ssl/server_ca.crt
 	cat $^ > $@
 
+ssl/nss/both-cas-1.crt.db: ssl/root_ca.crt ssl/client_ca.crt ssl/server_ca.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+
 # The same, but the certs are in different order
 ssl/both-cas-2.crt: ssl/root_ca.crt ssl/server_ca.crt ssl/client_ca.crt
 	cat $^ > $@
@@ -127,19 +261,41 @@ ssl/root+client_ca.crt: ssl/root_ca.crt ssl/client_ca.crt
 ssl/client+client_ca.crt: ssl/client.crt ssl/client_ca.crt
 	cat $^ > $@
 
+# Client certificate, signed by client CA
+ssl/nss/client+client_ca.crt__client.key.db: ssl/client+client_ca.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/client+client_ca.crt -i ssl/client+client_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client.crt -i ssl/client.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client.pfx -inkey ssl/client.key -in ssl/client.crt -certfile ssl/client_ca.crt -passout pass:
+	pk12util -i ssl/nss/client.pfx -d $@ -W ''
+
 #### CRLs
 
 ssl/client.crl: ssl/client-revoked.crt
 	openssl ca -config cas.config -name client_ca -revoke ssl/client-revoked.crt
 	openssl ca -config cas.config -name client_ca -gencrl -out ssl/client.crl
 
+ssl/nss/client.crl: ssl/client.crl
+	openssl crl -in $^ -outform der -out $@
+
 ssl/server.crl: ssl/server-revoked.crt
 	openssl ca -config cas.config -name server_ca -revoke ssl/server-revoked.crt
 	openssl ca -config cas.config -name server_ca -gencrl -out ssl/server.crl
 
+ssl/nss/server.crl: ssl/server.crl
+	openssl crl -in $^ -outform der -out $@
+
 ssl/root.crl: ssl/root_ca.crt
 	openssl ca -config cas.config -name root_ca -gencrl -out ssl/root.crl
 
+ssl/nss/root.crl: ssl/root.crl
+	openssl crl -in $^ -outform der -out $@
+
+ssl/nss/root+client.crl: ssl/root+client.crl
+	openssl crl -in $^ -outform der -out $@
+
 # If a CRL is used, OpenSSL requires a CRL file for *all* the CAs in the
 # chain, even if some of them are empty.
 ssl/root+server.crl: ssl/root.crl ssl/server.crl
@@ -151,9 +307,14 @@ ssl/root+client.crl: ssl/root.crl ssl/client.crl
 sslfiles-clean:
 	rm -f $(SSLFILES) ssl/client_ca.srl ssl/server_ca.srl ssl/client_ca-certindex* ssl/server_ca-certindex* ssl/root_ca-certindex* ssl/root_ca.srl ssl/temp_ca.crt ssl/temp_ca_signed.crt
 
+.PHONY: nssfiles-clean
+nssfiles-clean:
+	rm -rf ssl/nss
+
 clean distclean maintainer-clean:
 	rm -rf tmp_check
 	rm -rf ssl/*.old ssl/new_certs_dir ssl/client*_tmp.key
+	rm -rf ssl/nss
 
 # Doesn't depend on $(SSLFILES) because we don't rebuild them by default
 check:
diff --git a/src/test/ssl/t/001_ssltests.pl b/src/test/ssl/t/001_ssltests.pl
index fd2727b568..ece4a5b295 100644
--- a/src/test/ssl/t/001_ssltests.pl
+++ b/src/test/ssl/t/001_ssltests.pl
@@ -4,15 +4,22 @@ use PostgresNode;
 use TestLib;
 use Test::More;
 
-use File::Copy;
-
 use FindBin;
 use lib $FindBin::RealBin;
 
-use SSLServer;
+use SSL::Server;
+
+my $openssl;
+my $nss;
 
 if ($ENV{with_openssl} eq 'yes')
 {
+	$openssl = 1;
+	plan tests => 93;
+}
+elsif ($ENV{with_nss} eq 'yes')
+{
+	$nss = 1;
 	plan tests => 93;
 }
 else
@@ -32,32 +39,6 @@ my $SERVERHOSTCIDR = '127.0.0.1/32';
 # Allocation of base connection string shared among multiple tests.
 my $common_connstr;
 
-# The client's private key must not be world-readable, so take a copy
-# of the key stored in the code tree and update its permissions.
-#
-# This changes ssl/client.key to ssl/client_tmp.key etc for the rest
-# of the tests.
-my @keys = (
-	"client",     "client-revoked",
-	"client-der", "client-encrypted-pem",
-	"client-encrypted-der");
-foreach my $key (@keys)
-{
-	copy("ssl/${key}.key", "ssl/${key}_tmp.key")
-	  or die
-	  "couldn't copy ssl/${key}.key to ssl/${key}_tmp.key for permissions change: $!";
-	chmod 0600, "ssl/${key}_tmp.key"
-	  or die "failed to change permissions on ssl/${key}_tmp.key: $!";
-}
-
-# Also make a copy of that explicitly world-readable.  We can't
-# necessarily rely on the file in the source tree having those
-# permissions.  Add it to @keys to include it in the final clean
-# up phase.
-copy("ssl/client.key", "ssl/client_wrongperms_tmp.key");
-chmod 0644, "ssl/client_wrongperms_tmp.key";
-push @keys, 'client_wrongperms';
-
 #### Set up the server.
 
 note "setting up data directory";
@@ -72,32 +53,27 @@ $node->start;
 
 # Run this before we lock down access below.
 my $result = $node->safe_psql('postgres', "SHOW ssl_library");
-is($result, 'OpenSSL', 'ssl_library parameter');
+is($result, SSL::Server::ssl_library(), 'ssl_library parameter');
 
 configure_test_server_for_ssl($node, $SERVERHOSTADDR, $SERVERHOSTCIDR,
 	'trust');
 
 note "testing password-protected keys";
 
-open my $sslconf, '>', $node->data_dir . "/sslconfig.conf";
-print $sslconf "ssl=on\n";
-print $sslconf "ssl_cert_file='server-cn-only.crt'\n";
-print $sslconf "ssl_key_file='server-password.key'\n";
-print $sslconf "ssl_passphrase_command='echo wrongpassword'\n";
-close $sslconf;
-
-command_fails(
-	[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
-	'restart fails with password-protected key file with wrong password');
-$node->_update_pid(0);
-
-open $sslconf, '>', $node->data_dir . "/sslconfig.conf";
-print $sslconf "ssl=on\n";
-print $sslconf "ssl_cert_file='server-cn-only.crt'\n";
-print $sslconf "ssl_key_file='server-password.key'\n";
-print $sslconf "ssl_passphrase_command='echo secret1'\n";
-close $sslconf;
+SKIP:
+{
+	skip "Certificate passphrases aren't checked on server restart in NSS", 1 if ($nss);
+
+	switch_server_cert($node, 'server-cn-only', 'root+client_ca', 'server-password',
+		'echo wrongpassword');
+	command_fails(
+		[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
+		'restart fails with password-protected key file with wrong password');
+	$node->_update_pid(0);
+}
 
+switch_server_cert($node, 'server-cn-only', 'root+client_ca', 'server-password',
+	'echo secret1');
 command_ok(
 	[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
 	'restart succeeds with password-protected key file');
@@ -149,44 +125,51 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"sslrootcert=invalid sslmode=verify-ca",
-	qr/root certificate file "invalid" does not exist/,
+	qr/root certificate file "invalid" does not exist|could not connect to server/,
 	"connect without server root cert sslmode=verify-ca");
 test_connect_fails(
 	$common_connstr,
 	"sslrootcert=invalid sslmode=verify-full",
-	qr/root certificate file "invalid" does not exist/,
+	qr/root certificate file "invalid" does not exist|could not connect to server/,
 	"connect without server root cert sslmode=verify-full");
 
 # Try with wrong root cert, should fail. (We're using the client CA as the
 # root, but the server's key is signed by the server CA.)
 test_connect_fails($common_connstr,
-	"sslrootcert=ssl/client_ca.crt sslmode=require",
+	"sslrootcert=ssl/client_ca.crt sslmode=require cert_database=ssl/nss/client_ca.crt.db",
 	qr/SSL error/, "connect with wrong server root cert sslmode=require");
 test_connect_fails($common_connstr,
-	"sslrootcert=ssl/client_ca.crt sslmode=verify-ca",
+	"sslrootcert=ssl/client_ca.crt sslmode=verify-ca cert_database=ssl/nss/client_ca.crt.db",
 	qr/SSL error/, "connect with wrong server root cert sslmode=verify-ca");
 test_connect_fails($common_connstr,
-	"sslrootcert=ssl/client_ca.crt sslmode=verify-full",
+	"sslrootcert=ssl/client_ca.crt sslmode=verify-full cert_database=ssl/nss/client_ca.crt.db",
 	qr/SSL error/, "connect with wrong server root cert sslmode=verify-full");
 
-# Try with just the server CA's cert. This fails because the root file
-# must contain the whole chain up to the root CA.
-test_connect_fails($common_connstr,
-	"sslrootcert=ssl/server_ca.crt sslmode=verify-ca",
-	qr/SSL error/, "connect with server CA cert, without root CA");
+SKIP:
+{
+	# NSS supports partial chain validation, so this test doesnt work there.
+	# This is similar to the OpenSSL option X509_V_FLAG_PARTIAL_CHAIN which
+	# we don't allow.
+	skip "NSS support partial chain validation", 1 if ($nss);
+	# Try with just the server CA's cert. This fails because the root file
+	# must contain the whole chain up to the root CA.
+	test_connect_fails($common_connstr,
+		"sslrootcert=ssl/server_ca.crt sslmode=verify-ca cert_database=ssl/nss/server_ca.crt.db",
+		qr/SSL error/, "connect with server CA cert, without root CA");
+}
 
 # And finally, with the correct root cert.
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require cert_database=ssl/nss/root+server_ca.crt.db",
 	"connect with correct server CA cert file sslmode=require");
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca cert_database=ssl/nss/root+server_ca.crt.db",
 	"connect with correct server CA cert file sslmode=verify-ca");
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-full",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db",
 	"connect with correct server CA cert file sslmode=verify-full");
 
 # Test with cert root file that contains two certificates. The client should
@@ -195,36 +178,42 @@ test_connect_ok(
 	$common_connstr,
 	"sslrootcert=ssl/both-cas-1.crt sslmode=verify-ca",
 	"cert root file that contains two certificates, order 1");
-test_connect_ok(
-	$common_connstr,
-	"sslrootcert=ssl/both-cas-2.crt sslmode=verify-ca",
-	"cert root file that contains two certificates, order 2");
 
+# How about import the both-file into a database?
+SKIP:
+{
+	skip "CA ordering is irrelevant in NSS databases ", 1 if ($nss);
+
+	test_connect_ok(
+		$common_connstr,
+		"sslrootcert=ssl/both-cas-2.crt sslmode=verify-ca",
+		"cert root file that contains two certificates, order 2");
+}
 # CRL tests
 
 # Invalid CRL filename is the same as no CRL, succeeds
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=invalid",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=invalid cert_database=ssl/nss/root+server_ca.crt.db",
 	"sslcrl option with invalid file name");
 
 # A CRL belonging to a different CA is not accepted, fails
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/client.crl",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/client.crl cert_database=ssl/nss/root+server_ca.crt.db",
 	qr/SSL error/,
 	"CRL belonging to a different CA");
 
 # With the correct CRL, succeeds (this cert is not revoked)
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/root+server.crl",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/root+server.crl cert_database=ssl/nss/root+server_ca.crt.db",
 	"CRL with a non-revoked cert");
 
 # Check that connecting with verify-full fails, when the hostname doesn't
 # match the hostname in the server's certificate.
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -237,14 +226,14 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"sslmode=verify-full host=wronghost.test",
-	qr/\Qserver certificate for "common-name.pg-ssltest.test" does not match host name "wronghost.test"\E/,
+	qr/\Qserver certificate for "common-name.pg-ssltest.test" does not match host name "wronghost.test"\E|SSL_ERROR_BAD_CERT_DOMAIN/,
 	"mismatch between host name and server certificate sslmode=verify-full");
 
 # Test Subject Alternative Names.
 switch_server_cert($node, 'server-multiple-alt-names');
 
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -262,12 +251,12 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"host=wronghost.alt-name.pg-ssltest.test",
-	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "wronghost.alt-name.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "wronghost.alt-name.pg-ssltest.test"\E|SSL_ERROR_BAD_CERT_DOMAIN/,
 	"host name not matching with X.509 Subject Alternative Names");
 test_connect_fails(
 	$common_connstr,
 	"host=deep.subdomain.wildcard.pg-ssltest.test",
-	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E|SSL_ERROR_BAD_CERT_DOMAIN/,
 	"host name not matching with X.509 Subject Alternative Names wildcard");
 
 # Test certificate with a single Subject Alternative Name. (this gives a
@@ -275,7 +264,7 @@ test_connect_fails(
 switch_server_cert($node, 'server-single-alt-name');
 
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -285,12 +274,12 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"host=wronghost.alt-name.pg-ssltest.test",
-	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "wronghost.alt-name.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "wronghost.alt-name.pg-ssltest.test"\E|SSL_ERROR_BAD_CERT_DOMAIN/,
 	"host name not matching with a single X.509 Subject Alternative Name");
 test_connect_fails(
 	$common_connstr,
 	"host=deep.subdomain.wildcard.pg-ssltest.test",
-	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E|SSL_ERROR_BAD_CERT_DOMAIN/,
 	"host name not matching with a single X.509 Subject Alternative Name wildcard"
 );
 
@@ -299,7 +288,7 @@ test_connect_fails(
 switch_server_cert($node, 'server-cn-and-alt-names');
 
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -312,14 +301,14 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"host=common-name.pg-ssltest.test",
-	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 1 other name) does not match host name "common-name.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 1 other name) does not match host name "common-name.pg-ssltest.test"\E|SSL_ERROR_BAD_CERT_DOMAIN/,
 	"certificate with both a CN and SANs ignores CN");
 
 # Finally, test a server certificate that has no CN or SANs. Of course, that's
 # not a very sensible certificate, but libpq should handle it gracefully.
 switch_server_cert($node, 'server-no-names');
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -328,7 +317,7 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"sslmode=verify-full host=common-name.pg-ssltest.test",
-	qr/could not get server's host name from server certificate/,
+	qr/could not get server's host name from server certificate|SSL_ERROR_BAD_CERT_DOMAIN/,
 	"server certificate without CN or SANs sslmode=verify-full");
 
 # Test that the CRL works
@@ -340,11 +329,11 @@ $common_connstr =
 # Without the CRL, succeeds. With it, fails.
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca cert_database=ssl/nss/root+server_ca.crt.db",
 	"connects without client-side CRL");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/root+server.crl",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/server.crl cert_database=ssl/nss/root+server_ca.crt.db",
 	qr/SSL error/,
 	"does not connect with client-side CRL");
 
@@ -365,21 +354,21 @@ command_like(
 # Test min/max SSL protocol versions.
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.2",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.2 cert_database=ssl/nss/root+server_ca.crt.db",
 	"connection success with correct range of TLS protocol versions");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.1",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.1 cert_database=ssl/nss/root+server_ca.crt.db",
 	qr/invalid SSL protocol version range/,
 	"connection failure with incorrect range of TLS protocol versions");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=incorrect_tls",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=incorrect_tls cert_database=ssl/nss/root+server_ca.crt.db",
 	qr/invalid ssl_min_protocol_version value/,
 	"connection failure with an incorrect SSL protocol minimum bound");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_max_protocol_version=incorrect_tls",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_max_protocol_version=incorrect_tls cert_database=ssl/nss/root+server_ca.crt.db",
 	qr/invalid ssl_max_protocol_version value/,
 	"connection failure with an incorrect SSL protocol maximum bound");
 
@@ -390,7 +379,7 @@ test_connect_fails(
 note "running server tests";
 
 $common_connstr =
-  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR";
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client.crt__client.key.db";
 
 # no client cert
 test_connect_fails(
@@ -406,32 +395,43 @@ test_connect_ok(
 	"certificate authorization succeeds with correct client cert in PEM format"
 );
 
+$common_connstr =
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR";
+
+SKIP:
+{
+	skip "NSS database not implemented in the Makefile", 1 if ($nss);
 # correct client cert in unencrypted DER
 test_connect_ok(
 	$common_connstr,
 	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-der_tmp.key",
 	"certificate authorization succeeds with correct client cert in DER format"
 );
+}
 
 # correct client cert in encrypted PEM
 test_connect_ok(
 	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='dUmmyP^#+'",
+	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='dUmmyP^#+' cert_database=ssl/nss/client.crt__client-encrypted-pem.key.db",
 	"certificate authorization succeeds with correct client cert in encrypted PEM format"
 );
 
+SKIP:
+{
+	skip "NSS database not implemented in the Makefile", 1 if ($nss);
 # correct client cert in encrypted DER
 test_connect_ok(
 	$common_connstr,
 	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-der_tmp.key sslpassword='dUmmyP^#+'",
 	"certificate authorization succeeds with correct client cert in encrypted DER format"
 );
+}
 
 # correct client cert in encrypted PEM with wrong password
 test_connect_fails(
 	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='wrong'",
-	qr!\Qprivate key file "ssl/client-encrypted-pem_tmp.key": bad decrypt\E!,
+	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='wrong' cert_database=ssl/nss/client.crt__client-encrypted-pem.key.db",
+	qr!connection requires a valid client certificate|\Qprivate key file "ssl/client-encrypted-pem_tmp.key": bad decrypt\E!,
 	"certificate authorization fails with correct client cert and wrong password in encrypted PEM format"
 );
 
@@ -471,7 +471,7 @@ command_like(
 		'-P',
 		'null=_null_',
 		'-d',
-		"$common_connstr user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client_tmp.key",
+		"$common_connstr user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client_tmp.key cert_database=ssl/nss/client.crt__client.key.db",
 		'-c',
 		"SELECT * FROM pg_stat_ssl WHERE pid = pg_backend_pid()"
 	],
@@ -483,6 +483,7 @@ command_like(
 SKIP:
 {
 	skip "Permissions check not enforced on Windows", 2 if ($windows_os);
+	skip "Key not on filesystem with NSS", 2 if ($nss);
 
 	test_connect_fails(
 		$common_connstr,
@@ -495,10 +496,13 @@ SKIP:
 test_connect_fails(
 	$common_connstr,
 	"user=anotheruser sslcert=ssl/client.crt sslkey=ssl/client_tmp.key",
-	qr/certificate authentication failed for user "anotheruser"/,
+	qr/unable to verify certificate|certificate authentication failed for user "anotheruser"/,
 	"certificate authorization fails with client cert belonging to another user"
 );
 
+$common_connstr =
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client-revoked.crt__client-revoked.key.db";
+
 # revoked client cert
 test_connect_fails(
 	$common_connstr,
@@ -510,7 +514,7 @@ test_connect_fails(
 # works, iff username matches Common Name
 # fails, iff username doesn't match Common Name.
 $common_connstr =
-  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=verifydb hostaddr=$SERVERHOSTADDR";
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=verifydb hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client.crt__client.key.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -536,17 +540,15 @@ test_connect_ok(
 # intermediate client_ca.crt is provided by client, and isn't in server's ssl_ca_file
 switch_server_cert($node, 'server-cn-only', 'root_ca');
 $common_connstr =
-  "user=ssltestuser dbname=certdb sslkey=ssl/client_tmp.key sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR";
+  "user=ssltestuser dbname=certdb sslkey=ssl/client_tmp.key sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client+client_ca.crt__client.key.db";
 
 test_connect_ok(
 	$common_connstr,
 	"sslmode=require sslcert=ssl/client+client_ca.crt",
 	"intermediate client certificate is provided by client");
 test_connect_fails($common_connstr, "sslmode=require sslcert=ssl/client.crt",
-	qr/SSL error/, "intermediate client certificate is missing");
+	qr/connection requires a valid client certificate|SSL error/, "intermediate client certificate is missing");
 
 # clean up
-foreach my $key (@keys)
-{
-	unlink("ssl/${key}_tmp.key");
-}
+
+SSL::Server::cleanup();
diff --git a/src/test/ssl/t/002_scram.pl b/src/test/ssl/t/002_scram.pl
index 01231f8ba0..4ea81fdbcf 100644
--- a/src/test/ssl/t/002_scram.pl
+++ b/src/test/ssl/t/002_scram.pl
@@ -11,11 +11,11 @@ use File::Copy;
 use FindBin;
 use lib $FindBin::RealBin;
 
-use SSLServer;
+use SSL::Server;
 
 if ($ENV{with_openssl} ne 'yes')
 {
-	plan skip_all => 'SSL not supported by this build';
+	plan skip_all => 'OpenSSL not supported by this build';
 }
 
 # This is the hostname used to connect to the server.
diff --git a/src/test/ssl/t/SSL/Backend/NSS.pm b/src/test/ssl/t/SSL/Backend/NSS.pm
new file mode 100644
index 0000000000..d13b3922c7
--- /dev/null
+++ b/src/test/ssl/t/SSL/Backend/NSS.pm
@@ -0,0 +1,65 @@
+package SSL::Backend::NSS;
+
+use strict;
+use warnings;
+use Exporter;
+
+our @ISA = qw(Exporter);
+our @EXPORT_OK = qw(get_new_nss_backend);
+
+sub new
+{
+	my ($class) = @_;
+
+	my $self = {
+		_library => 'NSS'
+	};
+
+	bless $self, $class;
+
+	return $self;
+}
+
+sub get_new_nss_backend
+{
+	my $class = 'SSL::Backend::NSS';
+
+	return $class->new();
+}
+
+sub init
+{
+	# Make sure the certificate databases are in place?
+}
+
+sub get_library
+{
+	my ($self) = @_;
+
+	return $self->{_library};
+}
+
+sub set_server_cert
+{
+	my $self     = $_[0];
+	my $certfile = $_[1];
+	my $cafile   = $_[2];
+	my $keyfile  = $_[3];
+
+	my $cert_nickname = $certfile . '.crt__' . $keyfile . '.key';
+	my $cert_database = $cert_nickname . '.db';
+
+	my $sslconf = "ssl_ca_file='$cafile.crt'\n" .
+		"ssl_cert_file='ssl/$certfile.crt'\n" .
+		"ssl_crl_file=''\n" .
+		"ssl_database='nss/$cert_database'\n";
+
+	return $sslconf;
+}
+
+sub cleanup
+{
+	# Something?
+}
+
+1;
diff --git a/src/test/ssl/t/SSL/Backend/OpenSSL.pm b/src/test/ssl/t/SSL/Backend/OpenSSL.pm
new file mode 100644
index 0000000000..3b089d2b6d
--- /dev/null
+++ b/src/test/ssl/t/SSL/Backend/OpenSSL.pm
@@ -0,0 +1,103 @@
+package SSL::Backend::OpenSSL;
+
+use strict;
+use warnings;
+use Exporter;
+use File::Copy;
+
+our @ISA = qw(Exporter);
+our @EXPORT_OK = qw(get_new_openssl_backend);
+
+our (@keys);
+
+INIT
+{
+	@keys = (
+		"client",     "client-revoked",
+		"client-der", "client-encrypted-pem",
+		"client-encrypted-der");
+}
+
+sub new
+{
+	my ($class) = @_;
+
+	my $self = {
+		_library => 'OpenSSL'
+	};
+
+	bless $self, $class;
+
+	return $self;
+}
+
+sub get_new_openssl_backend
+{
+	my $class = 'SSL::Backend::OpenSSL';
+
+	my $backend = $class->new();
+
+	return $backend;
+}
+
+sub init
+{
+	# The client's private key must not be world-readable, so take a copy
+	# of the key stored in the code tree and update its permissions.
+	#
+	# This changes ssl/client.key to ssl/client_tmp.key etc for the rest
+	# of the tests.
+	foreach my $key (@keys)
+	{
+		copy("ssl/${key}.key", "ssl/${key}_tmp.key")
+		  or die
+		  "couldn't copy ssl/${key}.key to ssl/${key}_tmp.key for permissions change: $!";
+		chmod 0600, "ssl/${key}_tmp.key"
+		  or die "failed to change permissions on ssl/${key}_tmp.key: $!";
+	}
+
+	# Also make a copy of that explicitly world-readable.  We can't
+	# necessarily rely on the file in the source tree having those
+	# permissions. Add it to @keys to include it in the final clean
+	# up phase.
+	copy("ssl/client.key", "ssl/client_wrongperms_tmp.key")
+	  or die
+	  "couldn't copy ssl/client.key to ssl/client_wrongperms_tmp.key: $!";
+	chmod 0644, "ssl/client_wrongperms_tmp.key"
+	  or die "failed to change permissions on ssl/client_wrongperms_tmp.key: $!";
+	push @keys, 'client_wrongperms';
+}
+
+# Change the configuration to use given server cert file, and reload
+# the server so that the configuration takes effect.
+sub set_server_cert
+{
+	my $self     = $_[0];
+	my $certfile = $_[1];
+	my $cafile   = $_[2] || "root+client_ca";
+	my $keyfile  = $_[3] || $certfile;
+
+	my $sslconf = "ssl_ca_file='$cafile.crt'\n" .
+		"ssl_cert_file='$certfile.crt'\n" .
+		"ssl_key_file='$keyfile.key'\n" .
+		"ssl_crl_file='root+client.crl'\n";
+
+	return $sslconf;
+}
+
+sub get_library
+{
+	my ($self) = @_;
+
+	return $self->{_library};
+}
+
+sub cleanup
+{
+	foreach my $key (@keys)
+	{
+		unlink("ssl/${key}_tmp.key");
+	}
+}
+
+1;
diff --git a/src/test/ssl/t/SSLServer.pm b/src/test/ssl/t/SSL/Server.pm
similarity index 81%
rename from src/test/ssl/t/SSLServer.pm
rename to src/test/ssl/t/SSL/Server.pm
index 1e392b8fbf..8860dda8e3 100644
--- a/src/test/ssl/t/SSLServer.pm
+++ b/src/test/ssl/t/SSL/Server.pm
@@ -24,15 +24,34 @@
 # explicitly because an invalid sslcert or sslrootcert, respectively,
 # causes those to be ignored.)
 
-package SSLServer;
+package SSL::Server;
 
 use strict;
 use warnings;
 use PostgresNode;
+use RecursiveCopy;
 use TestLib;
 use File::Basename;
 use File::Copy;
 use Test::More;
+use SSL::Backend::OpenSSL qw(get_new_openssl_backend);
+use SSL::Backend::NSS qw(get_new_nss_backend);
+
+our ($openssl, $nss, $backend);
+
+# The TLS backend which the server is using should be mostly transparent for
+# the user, apart from individual configuration settings, so keep the backend
+# specific things abstracted behind SSL::Server.
+if ($ENV{with_openssl} eq 'yes')
+{
+	$backend = get_new_openssl_backend();
+	$openssl = 1;
+}
+elsif ($ENV{with_nss} eq 'yes')
+{
+	$backend = get_new_nss_backend();
+	$nss = 1;
+}
 
 use Exporter 'import';
 our @EXPORT = qw(
@@ -145,12 +164,19 @@ sub configure_test_server_for_ssl
 	close $sslconf;
 
 	# Copy all server certificates and keys, and client root cert, to the data dir
-	copy_files("ssl/server-*.crt", $pgdata);
-	copy_files("ssl/server-*.key", $pgdata);
-	chmod(0600, glob "$pgdata/server-*.key") or die $!;
-	copy_files("ssl/root+client_ca.crt", $pgdata);
-	copy_files("ssl/root_ca.crt",        $pgdata);
-	copy_files("ssl/root+client.crl",    $pgdata);
+	if (defined($openssl))
+	{
+		copy_files("ssl/server-*.crt", $pgdata);
+		copy_files("ssl/server-*.key", $pgdata);
+		chmod(0600, glob "$pgdata/server-*.key") or die $!;
+		copy_files("ssl/root+client_ca.crt", $pgdata);
+		copy_files("ssl/root_ca.crt",        $pgdata);
+		copy_files("ssl/root+client.crl",    $pgdata);
+	}
+	elsif (defined($nss))
+	{
+		RecursiveCopy::copypath("ssl/nss", $pgdata . "/nss") if -e "ssl/nss";
+	}
 
 	# Stop and restart server to load new listen_addresses.
 	$node->restart;
@@ -158,9 +184,22 @@ sub configure_test_server_for_ssl
 	# Change pg_hba after restart because hostssl requires ssl=on
 	configure_hba_for_ssl($node, $servercidr, $authmethod);
 
+	# Finally, perform backend specific configuration
+	$backend->init();
+
 	return;
 }
 
+sub ssl_library
+{
+	return $backend->get_library();
+}
+
+sub cleanup
+{
+	$backend->cleanup();
+}
+
 # Change the configuration to use given server cert file, and reload
 # the server so that the configuration takes effect.
 sub switch_server_cert
@@ -168,14 +207,17 @@ sub switch_server_cert
 	my $node     = $_[0];
 	my $certfile = $_[1];
 	my $cafile   = $_[2] || "root+client_ca";
+	my $keyfile  = $_[3] || '';
+	my $pwcmd    = $_[4] || '';
 	my $pgdata   = $node->data_dir;
 
+	$keyfile = $certfile if $keyfile eq '';
+
 	open my $sslconf, '>', "$pgdata/sslconfig.conf";
 	print $sslconf "ssl=on\n";
-	print $sslconf "ssl_ca_file='$cafile.crt'\n";
-	print $sslconf "ssl_cert_file='$certfile.crt'\n";
-	print $sslconf "ssl_key_file='$certfile.key'\n";
-	print $sslconf "ssl_crl_file='root+client.crl'\n";
+	print $sslconf $backend->set_server_cert($certfile, $cafile, $keyfile);
+	print $sslconf "ssl_passphrase_command='$pwcmd'\n"
+		unless $pwcmd eq '';
 	close $sslconf;
 
 	$node->restart;
diff --git a/src/tools/msvc/Solution.pm b/src/tools/msvc/Solution.pm
index a13ca6e02e..112e30c803 100644
--- a/src/tools/msvc/Solution.pm
+++ b/src/tools/msvc/Solution.pm
@@ -476,6 +476,7 @@ sub GenerateFiles
 		USE_NAMED_POSIX_SEMAPHORES => undef,
 		USE_OPENSSL                => undef,
 		USE_OPENSSL_RANDOM         => undef,
+		USE_NSS                    => undef,
 		USE_PAM                    => undef,
 		USE_SLICING_BY_8_CRC32C    => undef,
 		USE_SSE42_CRC32C           => undef,
@@ -529,6 +530,10 @@ sub GenerateFiles
 			$define{HAVE_OPENSSL_INIT_SSL}      = 1;
 		}
 	}
+	if ($self->{options}->{nss})
+	{
+		$define{USE_NSS} = 1;
+	}
 
 	$self->GenerateConfigHeader('src/include/pg_config.h',     \%define, 1);
 	$self->GenerateConfigHeader('src/include/pg_config_ext.h', \%define, 0);
-- 
2.21.1 (Apple Git-122.3)

From 06eeeaffdf934174acdbbfa7a536fb5d68648363 Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Mon, 20 Jul 2020 15:27:29 +0200
Subject: [PATCH] WIP: Support libnss for as TLS backend v5

---
 configure                                     |  211 ++++
 configure.in                                  |   30 +
 contrib/Makefile                              |    2 +-
 contrib/sslinfo/sslinfo.c                     |  164 ++-
 doc/src/sgml/sslinfo.sgml                     |   14 +-
 src/Makefile.global.in                        |   10 +
 src/backend/libpq/Makefile                    |    4 +
 src/backend/libpq/auth.c                      |    7 +
 src/backend/libpq/be-secure-nss.c             | 1032 +++++++++++++++++
 src/backend/libpq/be-secure-openssl.c         |   16 +-
 src/backend/libpq/be-secure.c                 |    3 +
 src/backend/utils/misc/guc.c                  |   20 +-
 src/include/common/pg_nss.h                   |  141 +++
 src/include/libpq/libpq-be.h                  |    9 +-
 src/include/libpq/libpq.h                     |    3 +
 src/include/pg_config.h.in                    |    3 +
 src/include/pg_config_manual.h                |    5 +-
 src/interfaces/libpq/Makefile                 |    4 +
 src/interfaces/libpq/fe-connect.c             |    4 +
 src/interfaces/libpq/fe-secure-nss.c          |  962 +++++++++++++++
 src/interfaces/libpq/libpq-fe.h               |   11 +
 src/interfaces/libpq/libpq-int.h              |    5 +
 src/test/Makefile                             |    2 +-
 src/test/ssl/Makefile                         |  172 +++
 src/test/ssl/t/001_ssltests.pl                |  278 ++---
 src/test/ssl/t/002_scram.pl                   |    4 +-
 src/test/ssl/t/SSL/Backend/NSS.pm             |   64 +
 src/test/ssl/t/SSL/Backend/OpenSSL.pm         |  103 ++
 .../ssl/t/{SSLServer.pm => SSL/Server.pm}     |   64 +-
 src/tools/msvc/Solution.pm                    |    5 +
 30 files changed, 3109 insertions(+), 243 deletions(-)
 create mode 100644 src/backend/libpq/be-secure-nss.c
 create mode 100644 src/include/common/pg_nss.h
 create mode 100644 src/interfaces/libpq/fe-secure-nss.c
 create mode 100644 src/test/ssl/t/SSL/Backend/NSS.pm
 create mode 100644 src/test/ssl/t/SSL/Backend/OpenSSL.pm
 rename src/test/ssl/t/{SSLServer.pm => SSL/Server.pm} (81%)

diff --git a/configure b/configure
index cb8fbe1051..8b7d98c2ab 100755
--- a/configure
+++ b/configure
@@ -711,6 +711,7 @@ with_uuid
 with_readline
 with_systemd
 with_selinux
+with_nss
 with_openssl
 with_ldap
 with_krb_srvnam
@@ -856,6 +857,7 @@ with_bsd_auth
 with_ldap
 with_bonjour
 with_openssl
+with_nss
 with_selinux
 with_systemd
 with_readline
@@ -1558,6 +1560,7 @@ Optional Packages:
   --with-ldap             build with LDAP support
   --with-bonjour          build with Bonjour support
   --with-openssl          build with OpenSSL support
+  --with-nss              build with NSS support
   --with-selinux          build with SELinux support
   --with-systemd          build with systemd support
   --without-readline      do not use GNU Readline nor BSD Libedit for editing
@@ -8100,6 +8103,41 @@ fi
 $as_echo "$with_openssl" >&6; }
 
 
+#
+# LibNSS
+#
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether to build with NSS support" >&5
+$as_echo_n "checking whether to build with NSS support... " >&6; }
+
+
+
+# Check whether --with-nss was given.
+if test "${with_nss+set}" = set; then :
+  withval=$with_nss;
+  case $withval in
+    yes)
+
+$as_echo "#define USE_NSS 1" >>confdefs.h
+
+      ;;
+    no)
+      :
+      ;;
+    *)
+      as_fn_error $? "no argument expected for --with-nss option" "$LINENO" 5
+      ;;
+  esac
+
+else
+  with_nss=no
+
+fi
+
+
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $with_nss" >&5
+$as_echo "$with_nss" >&6; }
+
+
 #
 # SELinux
 #
@@ -12174,6 +12212,9 @@ fi
 fi
 
 if test "$with_openssl" = yes ; then
+  if test x"$with_nss" = x"yes" ; then
+    as_fn_error $? "multiple SSL backends cannot be enabled simultaneously\"" "$LINENO" 5
+  fi
     # Minimum required OpenSSL version is 1.0.1
 
 $as_echo "#define OPENSSL_API_COMPAT 0x10001000L" >>confdefs.h
@@ -12436,6 +12477,157 @@ done
 
 fi
 
+if test "$with_nss" = yes ; then
+  if test x"$with_openssl" = x"yes" ; then
+    as_fn_error $? "multiple SSL backends cannot be enabled simultaneously\"" "$LINENO" 5
+  fi
+  CLEANLDFLAGS="$LDFLAGS"
+  # TODO: document this set of LDFLAGS
+  LDFLAGS="-lssl3 -lsmime3 -lnss3 -lplds4 -lplc4 -lnspr4 $LDFLAGS"
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for SSL_VersionRangeSet in -lnss3" >&5
+$as_echo_n "checking for SSL_VersionRangeSet in -lnss3... " >&6; }
+if ${ac_cv_lib_nss3_SSL_VersionRangeSet+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lnss3  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char SSL_VersionRangeSet ();
+int
+main ()
+{
+return SSL_VersionRangeSet ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_lib_nss3_SSL_VersionRangeSet=yes
+else
+  ac_cv_lib_nss3_SSL_VersionRangeSet=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_nss3_SSL_VersionRangeSet" >&5
+$as_echo "$ac_cv_lib_nss3_SSL_VersionRangeSet" >&6; }
+if test "x$ac_cv_lib_nss3_SSL_VersionRangeSet" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_LIBNSS3 1
+_ACEOF
+
+  LIBS="-lnss3 $LIBS"
+
+else
+  as_fn_error $? "library 'nss3' is required for NSS" "$LINENO" 5
+fi
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for PR_GetDefaultIOMethods in -lnspr4" >&5
+$as_echo_n "checking for PR_GetDefaultIOMethods in -lnspr4... " >&6; }
+if ${ac_cv_lib_nspr4_PR_GetDefaultIOMethods+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lnspr4  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char PR_GetDefaultIOMethods ();
+int
+main ()
+{
+return PR_GetDefaultIOMethods ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_lib_nspr4_PR_GetDefaultIOMethods=yes
+else
+  ac_cv_lib_nspr4_PR_GetDefaultIOMethods=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_nspr4_PR_GetDefaultIOMethods" >&5
+$as_echo "$ac_cv_lib_nspr4_PR_GetDefaultIOMethods" >&6; }
+if test "x$ac_cv_lib_nspr4_PR_GetDefaultIOMethods" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_LIBNSPR4 1
+_ACEOF
+
+  LIBS="-lnspr4 $LIBS"
+
+else
+  as_fn_error $? "library 'nspr4' is required for NSS" "$LINENO" 5
+fi
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for SSL_GetImplementedCiphers in -lssl3" >&5
+$as_echo_n "checking for SSL_GetImplementedCiphers in -lssl3... " >&6; }
+if ${ac_cv_lib_ssl3_SSL_GetImplementedCiphers+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lssl3  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char SSL_GetImplementedCiphers ();
+int
+main ()
+{
+return SSL_GetImplementedCiphers ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_lib_ssl3_SSL_GetImplementedCiphers=yes
+else
+  ac_cv_lib_ssl3_SSL_GetImplementedCiphers=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_ssl3_SSL_GetImplementedCiphers" >&5
+$as_echo "$ac_cv_lib_ssl3_SSL_GetImplementedCiphers" >&6; }
+if test "x$ac_cv_lib_ssl3_SSL_GetImplementedCiphers" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_LIBSSL3 1
+_ACEOF
+
+  LIBS="-lssl3 $LIBS"
+
+else
+  as_fn_error $? "library 'ssl3' is required for NSS" "$LINENO" 5
+fi
+
+  LDFLAGS="$CLEANLDFLAGS"
+fi
+
 if test "$with_pam" = yes ; then
   { $as_echo "$as_me:${as_lineno-$LINENO}: checking for pam_start in -lpam" >&5
 $as_echo_n "checking for pam_start in -lpam... " >&6; }
@@ -13338,6 +13530,25 @@ else
 fi
 
 
+fi
+
+if test "$with_nss" = yes ; then
+  ac_fn_c_check_header_mongrel "$LINENO" "ssl.h" "ac_cv_header_ssl_h" "$ac_includes_default"
+if test "x$ac_cv_header_ssl_h" = xyes; then :
+
+else
+  as_fn_error $? "header file <ssl.h> is required for NSS" "$LINENO" 5
+fi
+
+
+  ac_fn_c_check_header_mongrel "$LINENO" "nss.h" "ac_cv_header_nss_h" "$ac_includes_default"
+if test "x$ac_cv_header_nss_h" = xyes; then :
+
+else
+  as_fn_error $? "header file <nss.h> is required for NSS" "$LINENO" 5
+fi
+
+
 fi
 
 if test "$with_pam" = yes ; then
diff --git a/configure.in b/configure.in
index e91e49a579..35abe629bf 100644
--- a/configure.in
+++ b/configure.in
@@ -856,6 +856,15 @@ PGAC_ARG_BOOL(with, openssl, no, [build with OpenSSL support],
 AC_MSG_RESULT([$with_openssl])
 AC_SUBST(with_openssl)
 
+#
+# LibNSS
+#
+AC_MSG_CHECKING([whether to build with NSS support])
+PGAC_ARG_BOOL(with, nss, no, [build with NSS support],
+              [AC_DEFINE([USE_NSS], 1, [Define to build with NSS support. (--with-nss)])])
+AC_MSG_RESULT([$with_nss])
+AC_SUBST(with_nss)
+
 #
 # SELinux
 #
@@ -1205,6 +1214,9 @@ if test "$with_gssapi" = yes ; then
 fi
 
 if test "$with_openssl" = yes ; then
+  if test x"$with_nss" = x"yes" ; then
+    AC_MSG_ERROR([multiple SSL backends cannot be enabled simultaneously"])
+  fi
   dnl Order matters!
   # Minimum required OpenSSL version is 1.0.1
   AC_DEFINE(OPENSSL_API_COMPAT, [0x10001000L],
@@ -1230,6 +1242,19 @@ if test "$with_openssl" = yes ; then
   AC_CHECK_FUNCS([CRYPTO_lock])
 fi
 
+if test "$with_nss" = yes ; then
+  if test x"$with_openssl" = x"yes" ; then
+    AC_MSG_ERROR([multiple SSL backends cannot be enabled simultaneously"])
+  fi
+  CLEANLDFLAGS="$LDFLAGS"
+  # TODO: document this set of LDFLAGS
+  LDFLAGS="-lssl3 -lsmime3 -lnss3 -lplds4 -lplc4 -lnspr4 $LDFLAGS"
+  AC_CHECK_LIB(nss3, SSL_VersionRangeSet, [], [AC_MSG_ERROR([library 'nss3' is required for NSS])])
+  AC_CHECK_LIB(nspr4, PR_GetDefaultIOMethods, [], [AC_MSG_ERROR([library 'nspr4' is required for NSS])])
+  AC_CHECK_LIB(ssl3, SSL_GetImplementedCiphers, [], [AC_MSG_ERROR([library 'ssl3' is required for NSS])])
+  LDFLAGS="$CLEANLDFLAGS"
+fi
+
 if test "$with_pam" = yes ; then
   AC_CHECK_LIB(pam,    pam_start, [], [AC_MSG_ERROR([library 'pam' is required for PAM])])
 fi
@@ -1405,6 +1430,11 @@ if test "$with_openssl" = yes ; then
   AC_CHECK_HEADER(openssl/err.h, [], [AC_MSG_ERROR([header file <openssl/err.h> is required for OpenSSL])])
 fi
 
+if test "$with_nss" = yes ; then
+  AC_CHECK_HEADER(ssl.h, [], [AC_MSG_ERROR([header file <ssl.h> is required for NSS])])
+  AC_CHECK_HEADER(nss.h, [], [AC_MSG_ERROR([header file <nss.h> is required for NSS])])
+fi
+
 if test "$with_pam" = yes ; then
   AC_CHECK_HEADERS(security/pam_appl.h, [],
                    [AC_CHECK_HEADERS(pam/pam_appl.h, [],
diff --git a/contrib/Makefile b/contrib/Makefile
index 1846d415b6..cef7bf7f61 100644
--- a/contrib/Makefile
+++ b/contrib/Makefile
@@ -50,7 +50,7 @@ SUBDIRS = \
 		unaccent	\
 		vacuumlo
 
-ifeq ($(with_openssl),yes)
+ifeq ($(with_ssl),yes)
 SUBDIRS += sslinfo
 else
 ALWAYS_SUBDIRS += sslinfo
diff --git a/contrib/sslinfo/sslinfo.c b/contrib/sslinfo/sslinfo.c
index 5ba3988e27..84bb2c65b8 100644
--- a/contrib/sslinfo/sslinfo.c
+++ b/contrib/sslinfo/sslinfo.c
@@ -9,9 +9,11 @@
 
 #include "postgres.h"
 
+#ifdef USE_OPENSSL
 #include <openssl/x509.h>
 #include <openssl/x509v3.h>
 #include <openssl/asn1.h>
+#endif
 
 #include "access/htup_details.h"
 #include "funcapi.h"
@@ -21,8 +23,8 @@
 
 PG_MODULE_MAGIC;
 
+#ifdef USE_OPENSSL
 static Datum X509_NAME_field_to_text(X509_NAME *name, text *fieldName);
-static Datum X509_NAME_to_text(X509_NAME *name);
 static Datum ASN1_STRING_to_text(ASN1_STRING *str);
 
 /*
@@ -32,6 +34,7 @@ typedef struct
 {
 	TupleDesc	tupdesc;
 } SSLExtensionInfoContext;
+#endif
 
 /*
  * Indicates whether current session uses SSL
@@ -54,9 +57,16 @@ PG_FUNCTION_INFO_V1(ssl_version);
 Datum
 ssl_version(PG_FUNCTION_ARGS)
 {
-	if (MyProcPort->ssl == NULL)
+	const char *version;
+
+	if (!MyProcPort->ssl_in_use)
+		PG_RETURN_NULL();
+
+	version = be_tls_get_version(MyProcPort);
+	if (version == NULL)
 		PG_RETURN_NULL();
-	PG_RETURN_TEXT_P(cstring_to_text(SSL_get_version(MyProcPort->ssl)));
+
+	PG_RETURN_TEXT_P(cstring_to_text(version));
 }
 
 
@@ -67,9 +77,16 @@ PG_FUNCTION_INFO_V1(ssl_cipher);
 Datum
 ssl_cipher(PG_FUNCTION_ARGS)
 {
-	if (MyProcPort->ssl == NULL)
+	const char *cipher;
+
+	if (!MyProcPort->ssl_in_use)
 		PG_RETURN_NULL();
-	PG_RETURN_TEXT_P(cstring_to_text(SSL_get_cipher(MyProcPort->ssl)));
+
+	cipher = be_tls_get_cipher(MyProcPort);
+	if (cipher == NULL)
+		PG_RETURN_NULL();
+
+	PG_RETURN_TEXT_P(cstring_to_text(cipher));
 }
 
 
@@ -83,7 +100,7 @@ PG_FUNCTION_INFO_V1(ssl_client_cert_present);
 Datum
 ssl_client_cert_present(PG_FUNCTION_ARGS)
 {
-	PG_RETURN_BOOL(MyProcPort->peer != NULL);
+	PG_RETURN_BOOL(MyProcPort->peer_cert_valid);
 }
 
 
@@ -99,29 +116,26 @@ PG_FUNCTION_INFO_V1(ssl_client_serial);
 Datum
 ssl_client_serial(PG_FUNCTION_ARGS)
 {
+	char decimal[NAMEDATALEN];
 	Datum		result;
-	Port	   *port = MyProcPort;
-	X509	   *peer = port->peer;
-	ASN1_INTEGER *serial = NULL;
-	BIGNUM	   *b;
-	char	   *decimal;
 
-	if (!peer)
+	if (!MyProcPort->ssl_in_use || !MyProcPort->peer_cert_valid)
+		PG_RETURN_NULL();
+
+	be_tls_get_peer_serial(MyProcPort, decimal, NAMEDATALEN);
+
+	if (!*decimal)
 		PG_RETURN_NULL();
-	serial = X509_get_serialNumber(peer);
-	b = ASN1_INTEGER_to_BN(serial, NULL);
-	decimal = BN_bn2dec(b);
 
-	BN_free(b);
 	result = DirectFunctionCall3(numeric_in,
 								 CStringGetDatum(decimal),
 								 ObjectIdGetDatum(0),
 								 Int32GetDatum(-1));
-	OPENSSL_free(decimal);
 	return result;
 }
 
 
+#ifdef USE_OPENSSL
 /*
  * Converts OpenSSL ASN1_STRING structure into text
  *
@@ -228,7 +242,7 @@ ssl_client_dn_field(PG_FUNCTION_ARGS)
 	text	   *fieldname = PG_GETARG_TEXT_PP(0);
 	Datum		result;
 
-	if (!(MyProcPort->peer))
+	if (!MyProcPort->ssl_in_use || !MyProcPort->peer_cert_valid)
 		PG_RETURN_NULL();
 
 	result = X509_NAME_field_to_text(X509_get_subject_name(MyProcPort->peer), fieldname);
@@ -273,76 +287,23 @@ ssl_issuer_field(PG_FUNCTION_ARGS)
 	else
 		return result;
 }
+#endif							/* USE_OPENSSL */
 
-
-/*
- * Equivalent of X509_NAME_oneline that respects encoding
- *
- * This function converts X509_NAME structure to the text variable
- * converting all textual data into current database encoding.
- *
- * Parameter: X509_NAME *name X509_NAME structure to be converted
- *
- * Returns: text datum which contains string representation of
- * X509_NAME
- */
-static Datum
-X509_NAME_to_text(X509_NAME *name)
+#ifdef USE_NSS
+PG_FUNCTION_INFO_V1(ssl_client_dn_field);
+Datum
+ssl_client_dn_field(PG_FUNCTION_ARGS)
 {
-	BIO		   *membuf = BIO_new(BIO_s_mem());
-	int			i,
-				nid,
-				count = X509_NAME_entry_count(name);
-	X509_NAME_ENTRY *e;
-	ASN1_STRING *v;
-	const char *field_name;
-	size_t		size;
-	char		nullterm;
-	char	   *sp;
-	char	   *dp;
-	text	   *result;
-
-	if (membuf == NULL)
-		ereport(ERROR,
-				(errcode(ERRCODE_OUT_OF_MEMORY),
-				 errmsg("could not create OpenSSL BIO structure")));
-
-	(void) BIO_set_close(membuf, BIO_CLOSE);
-	for (i = 0; i < count; i++)
-	{
-		e = X509_NAME_get_entry(name, i);
-		nid = OBJ_obj2nid(X509_NAME_ENTRY_get_object(e));
-		if (nid == NID_undef)
-			ereport(ERROR,
-					(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
-					 errmsg("could not get NID for ASN1_OBJECT object")));
-		v = X509_NAME_ENTRY_get_data(e);
-		field_name = OBJ_nid2sn(nid);
-		if (field_name == NULL)
-			field_name = OBJ_nid2ln(nid);
-		if (field_name == NULL)
-			ereport(ERROR,
-					(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
-					 errmsg("could not convert NID %d to an ASN1_OBJECT structure", nid)));
-		BIO_printf(membuf, "/%s=", field_name);
-		ASN1_STRING_print_ex(membuf, v,
-							 ((ASN1_STRFLGS_RFC2253 & ~ASN1_STRFLGS_ESC_MSB)
-							  | ASN1_STRFLGS_UTF8_CONVERT));
-	}
-
-	/* ensure null termination of the BIO's content */
-	nullterm = '\0';
-	BIO_write(membuf, &nullterm, 1);
-	size = BIO_get_mem_data(membuf, &sp);
-	dp = pg_any_to_server(sp, size - 1, PG_UTF8);
-	result = cstring_to_text(dp);
-	if (dp != sp)
-		pfree(dp);
-	if (BIO_free(membuf) != 1)
-		elog(ERROR, "could not free OpenSSL BIO structure");
+	PG_RETURN_NULL();
+}
 
-	PG_RETURN_TEXT_P(result);
+PG_FUNCTION_INFO_V1(ssl_issuer_field);
+Datum
+ssl_issuer_field(PG_FUNCTION_ARGS)
+{
+	PG_RETURN_NULL();
 }
+#endif							/* USE_NSS */
 
 
 /*
@@ -358,9 +319,17 @@ PG_FUNCTION_INFO_V1(ssl_client_dn);
 Datum
 ssl_client_dn(PG_FUNCTION_ARGS)
 {
-	if (!(MyProcPort->peer))
+	char		subject[NAMEDATALEN];
+
+	if (!MyProcPort->ssl_in_use || !MyProcPort->peer_cert_valid)
+		PG_RETURN_NULL();
+
+	be_tls_get_peer_subject_name(MyProcPort, subject, NAMEDATALEN);
+
+	if (!*subject)
 		PG_RETURN_NULL();
-	return X509_NAME_to_text(X509_get_subject_name(MyProcPort->peer));
+
+	PG_RETURN_TEXT_P(cstring_to_text(subject));
 }
 
 
@@ -377,12 +346,21 @@ PG_FUNCTION_INFO_V1(ssl_issuer_dn);
 Datum
 ssl_issuer_dn(PG_FUNCTION_ARGS)
 {
-	if (!(MyProcPort->peer))
+	char		issuer[NAMEDATALEN];
+
+	if (!MyProcPort->ssl_in_use || !MyProcPort->peer_cert_valid)
+		PG_RETURN_NULL();
+
+	be_tls_get_peer_issuer_name(MyProcPort, issuer, NAMEDATALEN);
+
+	if (!*issuer)
 		PG_RETURN_NULL();
-	return X509_NAME_to_text(X509_get_issuer_name(MyProcPort->peer));
+
+	PG_RETURN_TEXT_P(cstring_to_text(issuer));
 }
 
 
+#ifdef USE_OPENSSL
 /*
  * Returns information about available SSL extensions.
  *
@@ -516,3 +494,13 @@ ssl_extension_info(PG_FUNCTION_ARGS)
 	/* All done */
 	SRF_RETURN_DONE(funcctx);
 }
+#endif							/* USE_OPENSSL */
+
+#ifdef USE_NSS
+PG_FUNCTION_INFO_V1(ssl_extension_info);
+Datum
+ssl_extension_info(PG_FUNCTION_ARGS)
+{
+	PG_RETURN_NULL();
+}
+#endif							/* USE_NSS */
diff --git a/doc/src/sgml/sslinfo.sgml b/doc/src/sgml/sslinfo.sgml
index c237d4ba95..d15a206d2d 100644
--- a/doc/src/sgml/sslinfo.sgml
+++ b/doc/src/sgml/sslinfo.sgml
@@ -22,7 +22,8 @@
 
  <para>
   This extension won't build at all unless the installation was
-  configured with <literal>--with-openssl</literal>.
+  configured with SSL support, such as <literal>--with-openssl</literal>
+  or <literal>--with-nss</literal>.
  </para>
 
  <sect2>
@@ -54,7 +55,7 @@
     <listitem>
     <para>
      Returns the name of the protocol used for the SSL connection (e.g. TLSv1.0
-     TLSv1.1, or TLSv1.2).
+     TLSv1.1, TLSv1.2 or TLSv1.3).
     </para>
     </listitem>
    </varlistentry>
@@ -208,6 +209,9 @@ emailAddress
      the X.500 and X.509 standards, so you cannot just assign arbitrary
      meaning to them.
     </para>
+    <para>
+     This function is only available when using OpenSSL.
+    </para>
     </listitem>
    </varlistentry>
 
@@ -223,6 +227,9 @@ emailAddress
      Same as <function>ssl_client_dn_field</function>, but for the certificate issuer
      rather than the certificate subject.
     </para>
+    <para>
+     This function is only available when using OpenSSL.
+    </para>
     </listitem>
    </varlistentry>
 
@@ -238,6 +245,9 @@ emailAddress
      Provide information about extensions of client certificate: extension name,
      extension value, and if it is a critical extension.
     </para>
+    <para>
+     This function is only available when using OpenSSL.
+    </para>
     </listitem>
    </varlistentry>
   </variablelist>
diff --git a/src/Makefile.global.in b/src/Makefile.global.in
index 9a6265b3a0..2f25c51c6c 100644
--- a/src/Makefile.global.in
+++ b/src/Makefile.global.in
@@ -184,6 +184,7 @@ with_perl	= @with_perl@
 with_python	= @with_python@
 with_tcl	= @with_tcl@
 with_openssl	= @with_openssl@
+with_nss        = @with_nss@
 with_readline	= @with_readline@
 with_selinux	= @with_selinux@
 with_systemd	= @with_systemd@
@@ -232,6 +233,15 @@ CLANG = @CLANG@
 BITCODE_CFLAGS = @BITCODE_CFLAGS@
 BITCODE_CXXFLAGS = @BITCODE_CXXFLAGS@
 
+ifeq ($(with_openssl),yes)
+with_ssl = yes
+else ifeq ($(with_nss),yes)
+with_ssl = yes
+else
+with_ssl = no
+endif
+
+
 ##########################################################################
 #
 # Programs and flags
diff --git a/src/backend/libpq/Makefile b/src/backend/libpq/Makefile
index efc5ef760a..191266a426 100644
--- a/src/backend/libpq/Makefile
+++ b/src/backend/libpq/Makefile
@@ -30,6 +30,10 @@ OBJS = \
 
 ifeq ($(with_openssl),yes)
 OBJS += be-secure-openssl.o
+else
+ifeq ($(with_nss),yes)
+OBJS += be-secure-nss.o
+endif
 endif
 
 ifeq ($(with_gssapi),yes)
diff --git a/src/backend/libpq/auth.c b/src/backend/libpq/auth.c
index 02b6c3f127..8f4197d002 100644
--- a/src/backend/libpq/auth.c
+++ b/src/backend/libpq/auth.c
@@ -2870,7 +2870,14 @@ CheckCertAuth(Port *port)
 {
 	int			status_check_usermap = STATUS_ERROR;
 
+#if defined(USE_OPENSSL)
 	Assert(port->ssl);
+#elif defined(USE_NSS)
+	/* TODO: should we rename pr_fd to ssl, to keep consistency? */
+	Assert(port->pr_fd);
+#else
+	Assert(false);
+#endif
 
 	/* Make sure we have received a username in the certificate */
 	if (port->peer_cn == NULL ||
diff --git a/src/backend/libpq/be-secure-nss.c b/src/backend/libpq/be-secure-nss.c
new file mode 100644
index 0000000000..2831fb16ea
--- /dev/null
+++ b/src/backend/libpq/be-secure-nss.c
@@ -0,0 +1,1032 @@
+/*-------------------------------------------------------------------------
+ *
+ * be-secure-nss.c
+ *	  functions for supporting NSS as a TLS backend
+ *
+ *
+ * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ *	  src/backend/libpq/be-secure-nss.c
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#include "postgres.h"
+
+#include <sys/stat.h>
+
+/*
+ * BITS_PER_BYTE is also defined in the NSPR header fils, so we need to undef
+ * our version to avoid compiler warnings on redefinition.
+ */
+#define pg_BITS_PER_BYTE BITS_PER_BYTE
+#undef BITS_PER_BYTE
+
+/*
+ * The nspr/obsolete/protypes.h NSPR header typedefs uint64 and int64 with
+ * colliding definitions from ours, causing a much expected compiler error.
+ * The definitions are however not actually used in NSPR at all, and are only
+ * intended for what seems to be backwards compatibility for apps written
+ * against old versions of NSPR.  The following comment is in the referenced
+ * file, and was added in 1998:
+ *
+ *		This section typedefs the old 'native' types to the new PR<type>s.
+ *		These definitions are scheduled to be eliminated at the earliest
+ *		possible time. The NSPR API is implemented and documented using
+ *		the new definitions.
+ *
+ * As there is no opt-out from pulling in these typedefs, we define the guard
+ * for the file to exclude it. This is incredibly ugly, but seems to be about
+ * the only way around it.
+ */
+#define PROTYPES_H
+#include <nspr.h>
+#undef PROTYPES_H
+#include <nss.h>
+#include <prio.h>
+#include <ssl.h>
+#include <sslerr.h>
+#include <secerr.h>
+#include <sslproto.h>
+#include <prtypes.h>
+#include <pk11pub.h>
+#include <secitem.h>
+#include <secport.h>
+#include <secder.h>
+#include <certdb.h>
+#include <base64.h>
+#include <cert.h>
+#include <prerror.h>
+#include <keyhi.h>
+
+typedef struct
+{
+	enum
+	{
+		PW_NONE = 0,
+		PW_FROMFILE = 1,
+		PW_PLAINTEXT = 2,
+		PW_EXTERNAL = 3
+	} source;
+	char	   *data;
+}			secuPWData;
+
+/*
+ * Ensure that the colliding definitions match, else throw an error. In case
+ * NSPR has removed the definition for some reasone, make sure to put ours
+ * back again.
+ */
+#if defined(BITS_PER_BYTE)
+#if BITS_PER_BYTE != pg_BITS_PER_BYTE
+#error "incompatible byte widths between NSPR and postgres"
+#endif
+#else
+#define BITS_PER_BYTE pg_BITS_PER_BYTE
+#endif
+#undef pg_BITS_PER_BYTE
+
+#include "common/pg_nss.h"
+#include "lib/stringinfo.h"
+#include "libpq/libpq.h"
+#include "nodes/pg_list.h"
+#include "miscadmin.h"
+#include "storage/fd.h"
+#include "utils/guc.h"
+#include "utils/memutils.h"
+
+static PRDescIdentity pr_id;
+
+static PRIOMethods pr_iomethods;
+static NSSInitContext * nss_context = NULL;
+static SSLVersionRange desired_sslver;
+
+/*
+ * PR_ImportTCPSocket() is a private API, but very widely used, as it's the
+ * only way to make NSS use an already set up POSIX file descriptor rather
+ * than opening one itself. To quote the NSS documentation:
+ *
+ *		"In theory, code that uses PR_ImportTCPSocket may break when NSPR's
+ *		implementation changes. In practice, this is unlikely to happen because
+ *		NSPR's implementation has been stable for years and because of NSPR's
+ *		strong commitment to backward compatibility."
+ *
+ * https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSPR/Reference/PR_ImportTCPSocket
+ *
+ * The function is declared in <private/pprio.h>, but as it is a header marked
+ * private we declare it here rather than including it.
+ */
+NSPR_API(PRFileDesc *) PR_ImportTCPSocket(int);
+
+/* NSS IO layer callback overrides */
+static PRInt32 pg_ssl_read(PRFileDesc * fd, void *buf, PRInt32 amount,
+						   PRIntn flags, PRIntervalTime timeout);
+static PRInt32 pg_ssl_write(PRFileDesc * fd, const void *buf, PRInt32 amount,
+							PRIntn flags, PRIntervalTime timeout);
+/* Utility functions */
+static PRFileDesc * init_iolayer(Port *port, int loglevel);
+static uint16 ssl_protocol_version_to_nss(int v, const char *guc_name);
+
+static char *pg_SSLerrmessage(PRErrorCode errcode);
+static char *ssl_protocol_version_to_string(int v);
+static SECStatus pg_cert_auth_handler(void *arg, PRFileDesc * fd,
+									  PRBool checksig, PRBool isServer);
+static SECStatus pg_bad_cert_handler(void *arg, PRFileDesc * fd);
+
+/* ------------------------------------------------------------ */
+/*						 Public interface						*/
+/* ------------------------------------------------------------ */
+
+static char *
+ssl_passphrase_callback(PK11SlotInfo * slot, PRBool retry, void *arg)
+{
+	return pstrdup("");
+}
+
+/*
+ * be_tls_init
+ *			Initialize the nss TLS library in the postmaster
+ *
+ * The majority of the setup needs to happen in be_tls_open_server since the
+ * NSPR initialization must happen after the forking of the backend. We could
+ * potentially move some parts in under !isServerStart, but so far this is the
+ * separation chosen.
+ */
+int
+be_tls_init(bool isServerStart)
+{
+	SECStatus	status;
+	SSLVersionRange supported_sslver;
+
+	/*
+	 * Set up the connection cache for multi-processing application behavior.
+	 * If we are in ServerStart then we initialize the cache. If the server is
+	 * already started, we inherit the cache such that it can be used for
+	 * connections. Calling SSL_ConfigMPServerSIDCache sets an environment
+	 * variable which contains enough information for the forked child to know
+	 * how to access it.  Passing NULL to SSL_InheritMPServerSIDCache will
+	 * make the forked child look it up by the default name SSL_INHERITANCE,
+	 * if env vars aren't inherited then the contents of the variable can be
+	 * passed instead.
+	 */
+	if (isServerStart)
+	{
+		/*
+		 * SSLv2 and SSLv3 are disabled in this TLS backend, but when setting
+		 * up the required session cache for NSS we still must supply timeout
+		 * values for v2 and The minimum allowed value for both is 5 seconds,
+		 * so opt for that in both cases (the defaults being 100 seconds and
+		 * 24 hours).
+		 *
+		 * Passing NULL as the directory for the session cache will default to
+		 * using /tmp on UNIX and \\temp on Windows.  Deciding if we want to
+		 * keep closer control on this directory is left as a TODO.
+		 */
+		status = SSL_ConfigMPServerSIDCache(MaxConnections, 5, 5, NULL);
+		if (status != SECSuccess)
+			ereport(FATAL,
+					(errmsg("unable to set up TLS connection cache: %s",
+							pg_SSLerrmessage(PR_GetError()))));
+
+	}
+	else
+	{
+		status = SSL_InheritMPServerSIDCache(NULL);
+		if (status != SECSuccess)
+		{
+			ereport(LOG,
+					(errmsg("unable to connect to TLS connection cache: %s",
+							pg_SSLerrmessage(PR_GetError()))));
+			return -1;
+		}
+	}
+
+	if (!ssl_database || strlen(ssl_database) == 0)
+	{
+		ereport(isServerStart ? FATAL : LOG,
+				(errmsg("no certificate database specified")));
+		goto error;
+	}
+
+	/*
+	 * We check for the desired TLS version range here, even though we cannot
+	 * set it until be_open_server such that we can be compatible with how the
+	 * OpenSSL backend reports errors for incompatible range configurations.
+	 * Set either the default supported TLS version range, or the configured
+	 * range from ssl_min_protocol_version and ssl_max_protocol version. In
+	 * case the user hasn't defined the maximum allowed version we fall back
+	 * to the highest version TLS that the library supports.
+	 */
+	if (SSL_VersionRangeGetSupported(ssl_variant_stream, &supported_sslver) != SECSuccess)
+	{
+		ereport(isServerStart ? FATAL : LOG,
+				(errmsg("unable to get default protocol support from NSS")));
+		goto error;
+	}
+
+	/*
+	 * Set the fallback versions for the TLS protocol version range to a
+	 * combination of our minimal requirement and the library maximum.
+	 */
+	desired_sslver.min = SSL_LIBRARY_VERSION_TLS_1_0;
+	desired_sslver.max = supported_sslver.max;
+
+	if (ssl_min_protocol_version)
+	{
+		int			ver = ssl_protocol_version_to_nss(ssl_min_protocol_version,
+													  "ssl_min_protocol_version");
+
+		if (ver == -1)
+		{
+			ereport(isServerStart ? FATAL : LOG,
+					(errmsg("\"%s\" setting \"%s\" not supported by this build",
+							"ssl_min_protocol_version",
+							GetConfigOption("ssl_min_protocol_version",
+											false, false))));
+			goto error;
+		}
+
+		if (ver > 0)
+			desired_sslver.min = ver;
+	}
+
+	if (ssl_max_protocol_version)
+	{
+		int			ver = ssl_protocol_version_to_nss(ssl_max_protocol_version,
+													  "ssl_max_protocol_version");
+
+		if (ver == -1)
+		{
+			ereport(isServerStart ? FATAL : LOG,
+					(errmsg("\"%s\" setting \"%s\" not supported by this build",
+							"ssl_max_protocol_version",
+							GetConfigOption("ssl_max_protocol_version",
+											false, false))));
+			goto error;
+		}
+		if (ver > 0)
+			desired_sslver.max = ver;
+
+		if (ver < desired_sslver.min)
+		{
+			ereport(isServerStart ? FATAL : LOG,
+					(errmsg("could not set SSL protocol version range"),
+					 errdetail("\"%s\" cannot be higher than \"%s\"",
+							   "ssl_min_protocol_version",
+							   "ssl_max_protocol_version")));
+			goto error;
+		}
+	}
+
+	return 0;
+error:
+	return -1;
+}
+
+int
+be_tls_open_server(Port *port)
+{
+	SECStatus	status;
+	PRFileDesc *model;
+	PRFileDesc *pr_fd;
+	PRFileDesc *layer;
+	CERTCertificate *server_cert;
+	SECKEYPrivateKey *private_key;
+	CERTSignedCrl *crl;
+	SECItem		crlname;
+	secuPWData	pwdata = {PW_NONE, 0};	/* TODO: This is a bogus callback */
+	char	   *cert_database;
+	NSSInitParameters params;
+
+	/*
+	 * The NSPR documentation states that runtime initialization via PR_Init
+	 * is no longer required, as the first caller into NSPR will perform the
+	 * initialization implicitly. The documentation doesn't however clarify
+	 * from which version this is holds true, so let's perform the potentially
+	 * superfluous initialization anyways to avoid crashing on older versions
+	 * of NSPR, as there is no difference in overhead.  The NSS documentation
+	 * still states that PR_Init must be called in some way (implicitly or
+	 * explicitly).
+	 *
+	 * The below parameters are what the implicit initialization would've done
+	 * for us, and should work even for older versions where it might not be
+	 * done automatically. The last parameter, maxPTDs, is set to various
+	 * values in other codebases, but has been unused since NSPR 2.1 which was
+	 * released sometime in 1998.
+	 */
+	PR_Init(PR_USER_THREAD, PR_PRIORITY_NORMAL, 0 /* maxPTDs */ );
+
+	/*
+	 * The certificate path (configdir) must contain a valid NSS database. If
+	 * the certificate path isn't a valid directory, NSS will fall back on the
+	 * system certificate database. If the certificate path is a directory but
+	 * is empty then the initialization will fail. On the client side this can
+	 * be allowed for any sslmode but the verify-xxx ones.
+	 * https://bugzilla.redhat.com/show_bug.cgi?id=728562 For the server side
+	 * we wont allow this to fail however, as we require the certificate and
+	 * key to exist.
+	 *
+	 * The original design of NSS was for a single application to use a single
+	 * copy of it, initialized with NSS_Initialize() which isn't returning any
+	 * handle with which to refer to NSS. NSS initialization and shutdown are
+	 * global for the application, so a shutdown in another NSS enabled
+	 * library would cause NSS to be stopped for libpq as well.  The fix has
+	 * been to introduce NSS_InitContext which returns a context handle to
+	 * pass to NSS_ShutdownContext.  NSS_InitContext was introduced in NSS
+	 * 3.12, but the use of it is not very well documented.
+	 * https://bugzilla.redhat.com/show_bug.cgi?id=738456
+	 *
+	 * The InitParameters struct passed can be used to override internal
+	 * values in NSS, but the usage is not documented at all. When using
+	 * NSS_Init initializations, the values are instead set via PK11_Configure
+	 * calls so the PK11_Configure documentation can be used to glean some
+	 * details on these.
+	 *
+	 * https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS/PKCS11/Module_Specs
+	 */
+	memset(&params, '\0', sizeof(params));
+	params.length = sizeof(params);
+
+	if (!ssl_database || strlen(ssl_database) == 0)
+		ereport(FATAL,
+				(errmsg("no certificate database specified")));
+
+	cert_database = psprintf("sql:%s", ssl_database);
+	nss_context = NSS_InitContext(cert_database, "", "", "",
+								  &params,
+								  NSS_INIT_READONLY | NSS_INIT_PK11RELOAD);
+	pfree(cert_database);
+
+	if (!nss_context)
+		ereport(FATAL,
+				(errmsg("unable to read certificate database \"%s\": %s",
+						ssl_database, pg_SSLerrmessage(PR_GetError()))));
+
+	/*
+	 * Set the passphrase callback which will be used both to obtain the
+	 * passphrase from the user, as well as by NSS to obtain the phrase
+	 * repeatedly.
+	 *
+	 * TODO: Figure this out - do note that we are setting another password
+	 * callback below for cert/key as well. Need to make sense of all these.
+	 */
+	PK11_SetPasswordFunc(ssl_passphrase_callback);
+
+	/*
+	 * Import the already opened socket as we don't want to use NSPR functions
+	 * for opening the network socket due to how the PostgreSQL protocol works
+	 * with TLS connections. This function is not part of the NSPR public API,
+	 * see the comment at the top of the file for the rationale of still using
+	 * it.
+	 */
+	pr_fd = PR_ImportTCPSocket(port->sock);
+	if (!pr_fd)
+		ereport(ERROR,
+				(errmsg("unable to connect to socket")));
+
+	/*
+	 * Most of the documentation available, and implementations of, NSS/NSPR
+	 * use the PR_NewTCPSocket() function here, which has the drawback that it
+	 * can only create IPv4 sockets. Instead use PR_OpenTCPSocket() which
+	 * copes with IPv6 as well.
+	 */
+	model = PR_OpenTCPSocket(port->laddr.addr.ss_family);
+	if (!model)
+		ereport(ERROR,
+				(errmsg("unable to open socket")));
+
+	/*
+	 * Convert the NSPR socket to an SSL socket. Ensuring the success of this
+	 * operation is critical as NSS SSL_* functions may return SECSuccess on
+	 * the socket even though SSL hasn't been enabled, which introduce a risk
+	 * of silent downgrades.
+	 */
+	model = SSL_ImportFD(NULL, model);
+	if (!model)
+		ereport(ERROR,
+				(errmsg("unable to enable TLS on socket")));
+
+	/*
+	 * Configure basic settings for the connection over the SSL socket in
+	 * order to set it up as a server.
+	 */
+	if (SSL_OptionSet(model, SSL_SECURITY, PR_TRUE) != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to configure TLS connection")));
+
+	if (SSL_OptionSet(model, SSL_HANDSHAKE_AS_SERVER, PR_TRUE) != SECSuccess ||
+		SSL_OptionSet(model, SSL_HANDSHAKE_AS_CLIENT, PR_FALSE) != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to configure TLS connection as server")));
+
+	/*
+	 * SSLv2 is disabled by default, and SSLv3 will be excluded from the range
+	 * of allowed protocols further down. Since we really don't want these to
+	 * ever be enabled, let's use belts and suspenders and explicitly turn
+	 * them off as well.
+	 */
+	SSL_OptionSet(model, SSL_ENABLE_SSL2, PR_FALSE);
+	SSL_OptionSet(model, SSL_ENABLE_SSL3, PR_FALSE);
+
+#ifdef SSL_CBC_RANDOM_IV
+
+	/*
+	 * Enable protection against the BEAST attack in case the NSS server has
+	 * support for that. While SSLv3 is disabled, we may still allow TLSv1
+	 * which is affected. The option isn't documented as an SSL option, but as
+	 * an NSS environment variable.
+	 */
+	SSL_OptionSet(model, SSL_CBC_RANDOM_IV, PR_TRUE);
+#endif
+
+	/*
+	 * Configure the allowed cipher. If there are no user preferred suites,
+	 * set the domestic policy. TODO: while this code works, the set of
+	 * ciphers which can be set and still end up with a working socket is
+	 * woefully underdocumented for anything more recent than SSLv3 (the code
+	 * for TLS actually calls ssl3 functions under the hood for
+	 * SSL_CipherPrefSet), so it's unclear if this is helpful or not. Using
+	 * the policies works, but may be too coarsely grained.
+	 *
+	 * Another TODO: The SSL_ImplementedCiphers table returned with calling
+	 * SSL_GetImplementedCiphers is sorted in server preference order. Sorting
+	 * SSLCipherSuites according to the order of the ciphers therein could be
+	 * a way to implement ssl_prefer_server_ciphers - if we at all want to use
+	 * cipher selection for NSS like how we do it for OpenSSL that is.
+	 */
+
+	/*
+	 * If no ciphers are specified, we use the domestic policy
+	 */
+	if (!SSLCipherSuites || strlen(SSLCipherSuites) == 0)
+	{
+		status = NSS_SetDomesticPolicy();
+		if (status != SECSuccess)
+			ereport(ERROR,
+					(errmsg("unable to set cipher policy: %s",
+							pg_SSLerrmessage(PR_GetError()))));
+	}
+	else
+	{
+		char	   *ciphers,
+				   *c,
+				   *b;
+		char	   *sep = ":;, ";
+		PRUint16	ciphercode;
+		const		PRUint16 *nss_ciphers;
+
+		/*
+		 * If the user has specified a set of preferred cipher suites we start
+		 * by turning off all the existing suites to avoid the risk of down-
+		 * grades to a weaker cipher than expected.
+		 */
+		nss_ciphers = SSL_GetImplementedCiphers();
+		for (int i = 0; i < SSL_GetNumImplementedCiphers(); i++)
+			SSL_CipherPrefSet(model, nss_ciphers[i], PR_FALSE);
+
+		ciphers = pstrdup(SSLCipherSuites);
+
+		for (c = strtok_r(ciphers, sep, &b); c; c = strtok_r(NULL, sep, &b))
+		{
+			ciphercode = pg_find_cipher(c);
+			if (ciphercode != INVALID_CIPHER)
+			{
+				status = SSL_CipherPrefSet(model, ciphercode, PR_TRUE);
+				if (status != SECSuccess)
+					ereport(ERROR,
+							(errmsg("invalid cipher-suite specified: %s", c)));
+			}
+		}
+
+		pfree(ciphers);
+	}
+
+	if (SSL_VersionRangeSet(model, &desired_sslver) != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to set requested SSL protocol version range")));
+
+	/*
+	 * Set up the custom IO layer.
+	 */
+	layer = init_iolayer(port, ERROR);
+	if (!layer)
+		goto error;
+
+	/* Store the Port as private data available in callbacks */
+	layer->secret = (void *) port;
+
+	if (PR_PushIOLayer(pr_fd, PR_TOP_IO_LAYER, layer) != PR_SUCCESS)
+	{
+		PR_Close(layer);
+		ereport(ERROR,
+				(errmsg("unable to push IO layer")));
+	}
+
+	/* TODO: set the postgres password callback param as callback function */
+	server_cert = PK11_FindCertFromNickname(ssl_cert_file, &pwdata /* password callback */ );
+	if (!server_cert)
+		ereport(ERROR,
+				(errmsg("unable to find certificate for \"%s\": %s",
+						ssl_cert_file, pg_SSLerrmessage(PR_GetError()))));
+
+	/* TODO: set the postgres password callback param as callback function */
+	private_key = PK11_FindKeyByAnyCert(server_cert, &pwdata /* password callback */ );
+	if (!private_key)
+		ereport(ERROR,
+				(errmsg("unable to find private key for \"%s\": %s",
+						ssl_cert_file, pg_SSLerrmessage(PR_GetError()))));
+
+	/*
+	 * NSS doesn't use CRL files on disk, so we use the ssl_crl_file guc to
+	 * contain the CRL nickname for the current server certificate in the NSS
+	 * certificate database. The main difference from the OpenSSL backend is
+	 * that NSS will use the CRL regardless, but being able to make sure the
+	 * CRL is loaded seems like a good feature.
+	 */
+	if (ssl_crl_file[0])
+	{
+		SECITEM_CopyItem(NULL, &crlname, &server_cert->derSubject);
+		crl = SEC_FindCrlByName(CERT_GetDefaultCertDB(), &crlname, SEC_CRL_TYPE);
+		if (!crl)
+			ereport(ERROR,
+					(errmsg("specified CRL not found in database")));
+		SEC_DestroyCrl(crl);
+	}
+
+	/*
+	 * Finally we must configure the socket for being a server by setting the
+	 * certificate and key.
+	 */
+	status = SSL_ConfigSecureServer(model, server_cert, private_key, kt_rsa);
+	if (status != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to configure secure server: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+	status = SSL_ConfigServerCert(model, server_cert, private_key, NULL, 0);
+	if (status != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to configure server for TLS server connections: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+
+	ssl_loaded_verify_locations = true;
+
+	/*
+	 * At this point, we no longer have use for the certificate and private
+	 * key as they have been copied into the context by NSS. Destroy our
+	 * copies explicitly to clean out the memory as best we can.
+	 */
+	CERT_DestroyCertificate(server_cert);
+	SECKEY_DestroyPrivateKey(private_key);
+
+	status = SSL_AuthCertificateHook(model, pg_cert_auth_handler, (void *) port);
+	if (status != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to install authcert hook: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+	SSL_BadCertHook(model, pg_bad_cert_handler, (void *) port);
+	SSL_OptionSet(model, SSL_REQUEST_CERTIFICATE, PR_TRUE);
+	SSL_OptionSet(model, SSL_REQUIRE_CERTIFICATE, PR_FALSE);
+
+	port->pr_fd = SSL_ImportFD(model, pr_fd);
+	if (!port->pr_fd)
+		ereport(ERROR,
+				(errmsg("unable to initialize")));
+
+	PR_Close(model);
+
+	/*
+	 * Force a handshake on the next I/O request, the second parameter means
+	 * that we are a server, PR_FALSE would indicate being a client. NSPR
+	 * requires us to call SSL_ResetHandshake since we imported an already
+	 * established socket.
+	 */
+	status = SSL_ResetHandshake(port->pr_fd, PR_TRUE);
+	if (status != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to initiate handshake: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+	status = SSL_ForceHandshake(port->pr_fd);
+	if (status != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to handshake: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+
+	port->ssl_in_use = true;
+	return 0;
+
+error:
+	return 1;
+}
+
+ssize_t
+be_tls_read(Port *port, void *ptr, size_t len, int *waitfor)
+{
+	ssize_t		n_read;
+	PRErrorCode err;
+
+	n_read = PR_Read(port->pr_fd, ptr, len);
+
+	if (n_read < 0)
+	{
+		err = PR_GetError();
+
+		/* XXX: This logic seems potentially bogus? */
+		if (err == PR_WOULD_BLOCK_ERROR)
+			*waitfor = WL_SOCKET_READABLE;
+		else
+			*waitfor = WL_SOCKET_WRITEABLE;
+	}
+
+	return n_read;
+}
+
+ssize_t
+be_tls_write(Port *port, void *ptr, size_t len, int *waitfor)
+{
+	ssize_t		n_write;
+	PRErrorCode err;
+
+	n_write = PR_Send(port->pr_fd, ptr, len, 0, PR_INTERVAL_NO_WAIT);
+
+	if (n_write < 0)
+	{
+		err = PR_GetError();
+
+		if (err == PR_WOULD_BLOCK_ERROR)
+			*waitfor = WL_SOCKET_WRITEABLE;
+		else
+			*waitfor = WL_SOCKET_READABLE;
+	}
+
+	return n_write;
+}
+
+void
+be_tls_close(Port *port)
+{
+	if (!port)
+		return;
+
+	if (port->peer_cn)
+	{
+		SSL_InvalidateSession(port->pr_fd);
+		pfree(port->peer_cn);
+		port->peer_cn = NULL;
+	}
+
+	PR_Close(port->pr_fd);
+	port->pr_fd = NULL;
+	port->ssl_in_use = false;
+
+	if (nss_context)
+	{
+		NSS_ShutdownContext(nss_context);
+		nss_context = NULL;
+	}
+}
+
+void
+be_tls_destroy(void)
+{
+	/*
+	 * It reads a bit odd to clear a session cache when we are destroying the
+	 * context altogether, but if the session cache isn't cleared before
+	 * shutting down the context it will fail with SEC_ERROR_BUSY.
+	 */
+	SSL_ClearSessionCache();
+}
+
+int
+be_tls_get_cipher_bits(Port *port)
+{
+	SECStatus	status;
+	SSLChannelInfo channel;
+	SSLCipherSuiteInfo suite;
+
+	status = SSL_GetChannelInfo(port->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+		goto error;
+
+	status = SSL_GetCipherSuiteInfo(channel.cipherSuite, &suite, sizeof(suite));
+	if (status != SECSuccess)
+		goto error;
+
+	return suite.effectiveKeyBits;
+
+error:
+	ereport(WARNING,
+			(errmsg("unable to extract TLS session information: %s",
+					pg_SSLerrmessage(PR_GetError()))));
+	return 0;
+}
+
+/*
+ * be_tls_get_compression
+ *
+ * NSS disabled support for TLS compression in version 3.33 and removed the
+ * code in a subsequent release. The API for retrieving information about
+ * compression as well as enabling it is kept for backwards compatibility, but
+ * we don't need to consult it since it was only available for SSLv3 which we
+ * don't support.
+ *
+ * https://bugzilla.mozilla.org/show_bug.cgi?id=1409587
+ */
+bool
+be_tls_get_compression(Port *port)
+{
+	return false;
+}
+
+const char *
+be_tls_get_version(Port *port)
+{
+	SECStatus	status;
+	SSLChannelInfo channel;
+
+	status = SSL_GetChannelInfo(port->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+	{
+		ereport(WARNING,
+				(errmsg("unable to extract TLS session information: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+		return NULL;
+	}
+
+	return ssl_protocol_version_to_string(channel.protocolVersion);
+}
+
+const char *
+be_tls_get_cipher(Port *port)
+{
+	SECStatus	status;
+	SSLChannelInfo channel;
+	SSLCipherSuiteInfo suite;
+
+	status = SSL_GetChannelInfo(port->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+		goto error;
+
+	status = SSL_GetCipherSuiteInfo(channel.cipherSuite, &suite, sizeof(suite));
+	if (status != SECSuccess)
+		goto error;
+
+	return suite.cipherSuiteName;
+
+error:
+	ereport(WARNING,
+			(errmsg("unable to extract TLS session information: %s",
+					pg_SSLerrmessage(PR_GetError()))));
+	return NULL;
+}
+
+void
+be_tls_get_peer_subject_name(Port *port, char *ptr, size_t len)
+{
+	CERTCertificate *certificate;
+
+	certificate = SSL_PeerCertificate(port->pr_fd);
+	if (certificate)
+		strlcpy(ptr, CERT_NameToAscii(&certificate->subject), len);
+	else
+		ptr[0] = '\0';
+}
+
+void
+be_tls_get_peer_issuer_name(Port *port, char *ptr, size_t len)
+{
+	CERTCertificate *certificate;
+
+	certificate = SSL_PeerCertificate(port->pr_fd);
+	if (certificate)
+		strlcpy(ptr, CERT_NameToAscii(&certificate->issuer), len);
+	else
+		ptr[0] = '\0';
+}
+
+void
+be_tls_get_peer_serial(Port *port, char *ptr, size_t len)
+{
+	CERTCertificate *certificate;
+
+	certificate = SSL_PeerCertificate(port->pr_fd);
+	if (certificate)
+		snprintf(ptr, len, "%li", DER_GetInteger(&(certificate->serialNumber)));
+	else
+		ptr[0] = '\0';
+}
+
+static SECStatus
+pg_bad_cert_handler(void *arg, PRFileDesc * fd)
+{
+	Port	   *port = (Port *) arg;
+
+	port->peer_cert_valid = false;
+	return SECFailure;
+}
+
+static SECStatus
+pg_cert_auth_handler(void *arg, PRFileDesc * fd, PRBool checksig, PRBool isServer)
+{
+	SECStatus	status;
+	Port	   *port = (Port *) arg;
+	CERTCertificate *cert;
+	char	   *peer_cn;
+	int			len;
+
+	status = SSL_AuthCertificate(CERT_GetDefaultCertDB(), port->pr_fd, checksig, PR_TRUE);
+	if (status == SECSuccess)
+	{
+		cert = SSL_PeerCertificate(port->pr_fd);
+		len = strlen(cert->subjectName);
+		peer_cn = MemoryContextAllocZero(TopMemoryContext, len + 1);
+		if (strncmp(cert->subjectName, "CN=", 3) == 0)
+			strlcpy(peer_cn, cert->subjectName + strlen("CN="), len + 1);
+		else
+			strlcpy(peer_cn, cert->subjectName, len + 1);
+		CERT_DestroyCertificate(cert);
+
+		port->peer_cn = peer_cn;
+		port->peer_cert_valid = true;
+	}
+
+	return status;
+}
+
+/* ------------------------------------------------------------ */
+/*						Internal functions						*/
+/* ------------------------------------------------------------ */
+
+static PRInt32
+pg_ssl_read(PRFileDesc * fd, void *buf, PRInt32 amount, PRIntn flags,
+			PRIntervalTime timeout)
+{
+	PRRecvFN	read_fn;
+	PRInt32		n_read;
+
+	read_fn = fd->lower->methods->recv;
+	n_read = read_fn(fd->lower, buf, amount, flags, timeout);
+
+	return n_read;
+}
+
+static PRInt32
+pg_ssl_write(PRFileDesc * fd, const void *buf, PRInt32 amount, PRIntn flags,
+			 PRIntervalTime timeout)
+{
+	PRSendFN	send_fn;
+	PRInt32		n_write;
+
+	send_fn = fd->lower->methods->send;
+	n_write = send_fn(fd->lower, buf, amount, flags, timeout);
+
+	return n_write;
+}
+
+static PRFileDesc *
+init_iolayer(Port *port, int loglevel)
+{
+	const		PRIOMethods *default_methods;
+	PRFileDesc *layer;
+
+	/*
+	 * Start by initializing our layer with all the default methods so that we
+	 * can selectively override the ones we want while still ensuring that we
+	 * have a complete layer specification.
+	 */
+	default_methods = PR_GetDefaultIOMethods();
+	memcpy(&pr_iomethods, default_methods, sizeof(PRIOMethods));
+
+	pr_iomethods.recv = pg_ssl_read;
+	pr_iomethods.send = pg_ssl_write;
+
+	/*
+	 * Each IO layer must be identified by a unique name, where uniqueness is
+	 * per connection. Each connection in a postgres cluster can generate the
+	 * identity from the same string as they will create their IO layers on
+	 * different sockets. Only one layer per socket can have the same name.
+	 */
+	pr_id = PR_GetUniqueIdentity("PostgreSQL");
+	if (pr_id == PR_INVALID_IO_LAYER)
+	{
+		ereport(loglevel,
+				(errmsg("out of memory when setting up TLS connection")));
+		return NULL;
+	}
+
+	/*
+	 * Create the actual IO layer as a stub such that it can be pushed onto
+	 * the layer stack. The step via a stub is required as we define custom
+	 * callbacks.
+	 */
+	layer = PR_CreateIOLayerStub(pr_id, &pr_iomethods);
+	if (!layer)
+	{
+		ereport(loglevel,
+				(errmsg("unable to create NSS I/O layer")));
+		return NULL;
+	}
+
+	return layer;
+}
+
+static char *
+ssl_protocol_version_to_string(int v)
+{
+	switch (v)
+	{
+			/* SSL v2 and v3 are not supported */
+		case SSL_LIBRARY_VERSION_2:
+		case SSL_LIBRARY_VERSION_3_0:
+			Assert(false);
+			break;
+
+		case SSL_LIBRARY_VERSION_TLS_1_0:
+			return pstrdup("TLSv1.0");
+		case SSL_LIBRARY_VERSION_TLS_1_1:
+			return pstrdup("TLSv1.1");
+		case SSL_LIBRARY_VERSION_TLS_1_2:
+			return pstrdup("TLSv1.2");
+		case SSL_LIBRARY_VERSION_TLS_1_3:
+			return pstrdup("TLSv1.3");
+	}
+
+	return pstrdup("unknown");
+}
+
+
+/*
+ * ssl_protocol_version_to_nss
+ *			Translate PostgreSQL TLS version to NSS version
+ *
+ * Returns zero in case the requested TLS version is undefined (PG_ANY) and
+ * should be set by the caller, or -1 on failure.
+ */
+static uint16
+ssl_protocol_version_to_nss(int v, const char *guc_name)
+{
+	switch (v)
+	{
+			/*
+			 * There is no SSL_LIBRARY_ macro defined in NSS with the value
+			 * zero, so we use this to signal the caller that the highest
+			 * useful version should be set on the connection.
+			 */
+		case PG_TLS_ANY:
+			return 0;
+
+			/*
+			 * No guard is required here as there are no versions of NSS
+			 * without support for TLS1.
+			 */
+		case PG_TLS1_VERSION:
+			return SSL_LIBRARY_VERSION_TLS_1_0;
+		case PG_TLS1_1_VERSION:
+#ifdef SSL_LIBRARY_VERSION_TLS_1_1
+			return SSL_LIBRARY_VERSION_TLS_1_1;
+#else
+			break;
+#endif
+		case PG_TLS1_2_VERSION:
+#ifdef SSL_LIBRARY_VERSION_TLS_1_2
+			return SSL_LIBRARY_VERSION_TLS_1_2;
+#else
+			break;
+#endif
+		case PG_TLS1_3_VERSION:
+#ifdef SSL_LIBRARY_VERSION_TLS_1_3
+			return SSL_LIBRARY_VERSION_TLS_1_3;
+#else
+			break;
+#endif
+		default:
+			break;
+	}
+
+	return -1;
+}
+
+/*
+ * pg_SSLerrmessage
+ *		Create and return a human readable error message given
+ *		the specified error code
+ *
+ * PR_ErrorToName only converts the enum identifier of the error to string,
+ * but that can be quite useful for debugging (and in case PR_ErrorToString is
+ * unable to render a message then we at least have something).
+ */
+static char *
+pg_SSLerrmessage(PRErrorCode errcode)
+{
+	char		error[128];
+	int			ret;
+
+	/* TODO: this should perhaps use a StringInfo instead.. */
+	ret = pg_snprintf(error, sizeof(error), "%s (%s)",
+					  PR_ErrorToString(errcode, PR_LANGUAGE_I_DEFAULT),
+					  PR_ErrorToName(errcode));
+	if (ret)
+		return pstrdup(error);
+
+	return pstrdup(_("unknown TLS error"));
+}
diff --git a/src/backend/libpq/be-secure-openssl.c b/src/backend/libpq/be-secure-openssl.c
index 8b21ff4065..5962cffc0c 100644
--- a/src/backend/libpq/be-secure-openssl.c
+++ b/src/backend/libpq/be-secure-openssl.c
@@ -1298,15 +1298,28 @@ X509_NAME_to_cstring(X509_NAME *name)
 	char	   *dp;
 	char	   *result;
 
+	if (membuf == NULL)
+		ereport(ERROR,
+				(errcode(ERRCODE_OUT_OF_MEMORY),
+				 errmsg("failed to create BIO")));
+
 	(void) BIO_set_close(membuf, BIO_CLOSE);
 	for (i = 0; i < count; i++)
 	{
 		e = X509_NAME_get_entry(name, i);
 		nid = OBJ_obj2nid(X509_NAME_ENTRY_get_object(e));
+		if (nid == NID_undef)
+			ereport(ERROR,
+					(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
+					 errmsg("could not get NID for ASN1_OBJECT object")));
 		v = X509_NAME_ENTRY_get_data(e);
 		field_name = OBJ_nid2sn(nid);
 		if (!field_name)
 			field_name = OBJ_nid2ln(nid);
+		if (field_name == NULL)
+			ereport(ERROR,
+					(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
+					 errmsg("could not convert NID %d to an ASN1_OBJECT structure", nid)));
 		BIO_printf(membuf, "/%s=", field_name);
 		ASN1_STRING_print_ex(membuf, v,
 							 ((ASN1_STRFLGS_RFC2253 & ~ASN1_STRFLGS_ESC_MSB)
@@ -1322,7 +1335,8 @@ X509_NAME_to_cstring(X509_NAME *name)
 	result = pstrdup(dp);
 	if (dp != sp)
 		pfree(dp);
-	BIO_free(membuf);
+	if (BIO_free(membuf) != 1)
+		elog(ERROR, "could not free OpenSSL BIO structure");
 
 	return result;
 }
diff --git a/src/backend/libpq/be-secure.c b/src/backend/libpq/be-secure.c
index 2ae507a902..f39977b80c 100644
--- a/src/backend/libpq/be-secure.c
+++ b/src/backend/libpq/be-secure.c
@@ -49,6 +49,9 @@ bool		ssl_passphrase_command_supports_reload;
 #ifdef USE_SSL
 bool		ssl_loaded_verify_locations = false;
 #endif
+#ifdef USE_NSS
+char	   *ssl_database;
+#endif
 
 /* GUC variable controlling SSL cipher list */
 char	   *SSLCipherSuites = NULL;
diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c
index 6f603cbbe8..78e1ed5b8b 100644
--- a/src/backend/utils/misc/guc.c
+++ b/src/backend/utils/misc/guc.c
@@ -4250,7 +4250,11 @@ static struct config_string ConfigureNamesString[] =
 		},
 		&ssl_library,
 #ifdef USE_SSL
+#if defined(USE_OPENSSL)
 		"OpenSSL",
+#elif defined(USE_NSS)
+		"NSS",
+#endif
 #else
 		"",
 #endif
@@ -4308,6 +4312,18 @@ static struct config_string ConfigureNamesString[] =
 		check_canonical_path, assign_pgstat_temp_directory, NULL
 	},
 
+#ifdef USE_NSS
+	{
+		{"ssl_database", PGC_SIGHUP, CONN_AUTH_SSL,
+			gettext_noop("Location of the NSS certificate database."),
+			NULL
+		},
+		&ssl_database,
+		"",
+		NULL, NULL, NULL
+	},
+#endif
+
 	{
 		{"synchronous_standby_names", PGC_SIGHUP, REPLICATION_PRIMARY,
 			gettext_noop("Number of synchronous standbys and list of names of potential synchronous ones."),
@@ -4336,8 +4352,10 @@ static struct config_string ConfigureNamesString[] =
 			GUC_SUPERUSER_ONLY
 		},
 		&SSLCipherSuites,
-#ifdef USE_OPENSSL
+#if defined(USE_OPENSSL)
 		"HIGH:MEDIUM:+3DES:!aNULL",
+#elif defined (USE_NSS)
+		"",
 #else
 		"none",
 #endif
diff --git a/src/include/common/pg_nss.h b/src/include/common/pg_nss.h
new file mode 100644
index 0000000000..74298c8bb1
--- /dev/null
+++ b/src/include/common/pg_nss.h
@@ -0,0 +1,141 @@
+/*-------------------------------------------------------------------------
+ *
+ * pg_nss.h
+ *	  Support for NSS as a TLS backend
+ *
+ * These definitions are used by both frontend and backend code.
+ *
+ * Copyright (c) 2020, PostgreSQL Global Development Group
+ *
+ * IDENTIFICATION
+ *        src/include/common/pg_nss.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef PG_NSS_H
+#define PG_NSS_H
+
+#ifdef USE_NSS
+
+#include <sslproto.h>
+
+PRUint16	pg_find_cipher(char *name);
+
+typedef struct
+{
+	const char *name;
+	PRUint16	number;
+}			NSSCiphers;
+
+#define INVALID_CIPHER	0xFFFF
+
+/*
+ * This list is a partial copy of the ciphers in NSS files lib/ssl/sslproto.h
+ * in order to provide a human readable version of the ciphers. It would be
+ * nice to not have to have this, but NSS doesn't provide any API addressing
+ * the ciphers by name. TODO: do we want more of the ciphers, or perhaps less?
+ */
+static const NSSCiphers NSS_CipherList[] = {
+
+	{"TLS_NULL_WITH_NULL_NULL", TLS_NULL_WITH_NULL_NULL},
+
+	{"TLS_RSA_WITH_NULL_MD5", TLS_RSA_WITH_NULL_MD5},
+	{"TLS_RSA_WITH_NULL_SHA", TLS_RSA_WITH_NULL_SHA},
+	{"TLS_RSA_WITH_RC4_128_MD5", TLS_RSA_WITH_RC4_128_MD5},
+	{"TLS_RSA_WITH_RC4_128_SHA", TLS_RSA_WITH_RC4_128_SHA},
+	{"TLS_RSA_WITH_IDEA_CBC_SHA", TLS_RSA_WITH_IDEA_CBC_SHA},
+	{"TLS_RSA_WITH_DES_CBC_SHA", TLS_RSA_WITH_DES_CBC_SHA},
+	{"TLS_RSA_WITH_3DES_EDE_CBC_SHA", TLS_RSA_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_DH_DSS_WITH_DES_CBC_SHA", TLS_DH_DSS_WITH_DES_CBC_SHA},
+	{"TLS_DH_DSS_WITH_3DES_EDE_CBC_SHA", TLS_DH_DSS_WITH_3DES_EDE_CBC_SHA},
+	{"TLS_DH_RSA_WITH_DES_CBC_SHA", TLS_DH_RSA_WITH_DES_CBC_SHA},
+	{"TLS_DH_RSA_WITH_3DES_EDE_CBC_SHA", TLS_DH_RSA_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_DHE_DSS_WITH_DES_CBC_SHA", TLS_DHE_DSS_WITH_DES_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_3DES_EDE_CBC_SHA", TLS_DHE_DSS_WITH_3DES_EDE_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_DES_CBC_SHA", TLS_DHE_RSA_WITH_DES_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA", TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_DH_anon_WITH_RC4_128_MD5", TLS_DH_anon_WITH_RC4_128_MD5},
+	{"TLS_DH_anon_WITH_DES_CBC_SHA", TLS_DH_anon_WITH_DES_CBC_SHA},
+	{"TLS_DH_anon_WITH_3DES_EDE_CBC_SHA", TLS_DH_anon_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_RSA_WITH_AES_128_CBC_SHA", TLS_RSA_WITH_AES_128_CBC_SHA},
+	{"TLS_DH_DSS_WITH_AES_128_CBC_SHA", TLS_DH_DSS_WITH_AES_128_CBC_SHA},
+	{"TLS_DH_RSA_WITH_AES_128_CBC_SHA", TLS_DH_RSA_WITH_AES_128_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_AES_128_CBC_SHA", TLS_DHE_DSS_WITH_AES_128_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_AES_128_CBC_SHA", TLS_DHE_RSA_WITH_AES_128_CBC_SHA},
+	{"TLS_DH_anon_WITH_AES_128_CBC_SHA", TLS_DH_anon_WITH_AES_128_CBC_SHA},
+
+	{"TLS_RSA_WITH_AES_256_CBC_SHA", TLS_RSA_WITH_AES_256_CBC_SHA},
+	{"TLS_DH_DSS_WITH_AES_256_CBC_SHA", TLS_DH_DSS_WITH_AES_256_CBC_SHA},
+	{"TLS_DH_RSA_WITH_AES_256_CBC_SHA", TLS_DH_RSA_WITH_AES_256_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_AES_256_CBC_SHA", TLS_DHE_DSS_WITH_AES_256_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_AES_256_CBC_SHA", TLS_DHE_RSA_WITH_AES_256_CBC_SHA},
+	{"TLS_DH_anon_WITH_AES_256_CBC_SHA", TLS_DH_anon_WITH_AES_256_CBC_SHA},
+	{"TLS_RSA_WITH_NULL_SHA256", TLS_RSA_WITH_NULL_SHA256},
+	{"TLS_RSA_WITH_AES_128_CBC_SHA256", TLS_RSA_WITH_AES_128_CBC_SHA256},
+	{"TLS_RSA_WITH_AES_256_CBC_SHA256", TLS_RSA_WITH_AES_256_CBC_SHA256},
+
+	{"TLS_DHE_DSS_WITH_AES_128_CBC_SHA256", TLS_DHE_DSS_WITH_AES_128_CBC_SHA256},
+	{"TLS_RSA_WITH_CAMELLIA_128_CBC_SHA", TLS_RSA_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DH_DSS_WITH_CAMELLIA_128_CBC_SHA", TLS_DH_DSS_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DH_RSA_WITH_CAMELLIA_128_CBC_SHA", TLS_DH_RSA_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_CAMELLIA_128_CBC_SHA", TLS_DHE_DSS_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA", TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DH_anon_WITH_CAMELLIA_128_CBC_SHA", TLS_DH_anon_WITH_CAMELLIA_128_CBC_SHA},
+
+	{"TLS_DHE_DSS_WITH_RC4_128_SHA", TLS_DHE_DSS_WITH_RC4_128_SHA},
+	{"TLS_DHE_RSA_WITH_AES_128_CBC_SHA256", TLS_DHE_RSA_WITH_AES_128_CBC_SHA256},
+	{"TLS_DHE_DSS_WITH_AES_256_CBC_SHA256", TLS_DHE_DSS_WITH_AES_256_CBC_SHA256},
+	{"TLS_DHE_RSA_WITH_AES_256_CBC_SHA256", TLS_DHE_RSA_WITH_AES_256_CBC_SHA256},
+
+	{"TLS_RSA_WITH_CAMELLIA_256_CBC_SHA", TLS_RSA_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DH_DSS_WITH_CAMELLIA_256_CBC_SHA", TLS_DH_DSS_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DH_RSA_WITH_CAMELLIA_256_CBC_SHA", TLS_DH_RSA_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_CAMELLIA_256_CBC_SHA", TLS_DHE_DSS_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA", TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DH_anon_WITH_CAMELLIA_256_CBC_SHA", TLS_DH_anon_WITH_CAMELLIA_256_CBC_SHA},
+
+	{"TLS_RSA_WITH_SEED_CBC_SHA", TLS_RSA_WITH_SEED_CBC_SHA},
+
+	{"TLS_RSA_WITH_AES_128_GCM_SHA256", TLS_RSA_WITH_AES_128_GCM_SHA256},
+	{"TLS_RSA_WITH_AES_256_GCM_SHA384", TLS_RSA_WITH_AES_256_GCM_SHA384},
+	{"TLS_DHE_RSA_WITH_AES_128_GCM_SHA256", TLS_DHE_RSA_WITH_AES_128_GCM_SHA256},
+	{"TLS_DHE_RSA_WITH_AES_256_GCM_SHA384", TLS_DHE_RSA_WITH_AES_256_GCM_SHA384},
+	{"TLS_DHE_DSS_WITH_AES_128_GCM_SHA256", TLS_DHE_DSS_WITH_AES_128_GCM_SHA256},
+	{"TLS_DHE_DSS_WITH_AES_256_GCM_SHA384", TLS_DHE_DSS_WITH_AES_256_GCM_SHA384},
+
+	{"TLS_AES_128_GCM_SHA256", TLS_AES_128_GCM_SHA256},
+	{"TLS_AES_256_GCM_SHA384", TLS_AES_256_GCM_SHA384},
+	{"TLS_CHACHA20_POLY1305_SHA256", TLS_CHACHA20_POLY1305_SHA256},
+	{NULL, 0}
+};
+
+/*
+ * pg_find_cipher
+ *			Translate an NSS ciphername to the cipher code
+ *
+ * Searches the configured ciphers for the corresponding cipher code to the
+ * name. Search is performed case insensitive.
+ */
+PRUint16
+pg_find_cipher(char *name)
+{
+	const		NSSCiphers *cipher_list = NSS_CipherList;
+
+	while (cipher_list->name)
+	{
+		if (pg_strcasecmp(cipher_list->name, name) == 0)
+			return cipher_list->number;
+
+		cipher_list++;
+	}
+
+	return 0xFFFF;
+}
+
+#endif							/* USE_NSS */
+
+#endif							/* PG_NSS_H */
diff --git a/src/include/libpq/libpq-be.h b/src/include/libpq/libpq-be.h
index 179ebaa104..6211510fab 100644
--- a/src/include/libpq/libpq-be.h
+++ b/src/include/libpq/libpq-be.h
@@ -192,13 +192,18 @@ typedef struct Port
 	bool		peer_cert_valid;
 
 	/*
-	 * OpenSSL structures. (Keep these last so that the locations of other
-	 * fields are the same whether or not you build with OpenSSL.)
+	 * SSL backend specific structures. (Keep these last so that the locations
+	 * of other fields are the same whether or not you build with SSL
+	 * enabled.)
 	 */
 #ifdef USE_OPENSSL
 	SSL		   *ssl;
 	X509	   *peer;
 #endif
+
+#ifdef USE_NSS
+	void	   *pr_fd;
+#endif
 } Port;
 
 #ifdef USE_SSL
diff --git a/src/include/libpq/libpq.h b/src/include/libpq/libpq.h
index b1152475ac..298d87ecae 100644
--- a/src/include/libpq/libpq.h
+++ b/src/include/libpq/libpq.h
@@ -88,6 +88,9 @@ extern PGDLLIMPORT bool ssl_passphrase_command_supports_reload;
 #ifdef USE_SSL
 extern bool ssl_loaded_verify_locations;
 #endif
+#ifdef USE_NSS
+extern char *ssl_database;
+#endif
 
 extern int	secure_initialize(bool isServerStart);
 extern bool secure_loaded_verify_locations(void);
diff --git a/src/include/pg_config.h.in b/src/include/pg_config.h.in
index 73aa618166..8044e1e17f 100644
--- a/src/include/pg_config.h.in
+++ b/src/include/pg_config.h.in
@@ -893,6 +893,9 @@
 /* Define to 1 to build with PAM support. (--with-pam) */
 #undef USE_PAM
 
+/* Define to build with NSS support (--with-nss) */
+#undef USE_NSS
+
 /* Define to 1 to use software CRC-32C implementation (slicing-by-8). */
 #undef USE_SLICING_BY_8_CRC32C
 
diff --git a/src/include/pg_config_manual.h b/src/include/pg_config_manual.h
index 45b6a45789..3ead0ac546 100644
--- a/src/include/pg_config_manual.h
+++ b/src/include/pg_config_manual.h
@@ -176,10 +176,9 @@
 
 /*
  * USE_SSL code should be compiled only when compiling with an SSL
- * implementation.  (Currently, only OpenSSL is supported, but we might add
- * more implementations in the future.)
+ * implementation.
  */
-#ifdef USE_OPENSSL
+#if defined(USE_OPENSSL) || defined(USE_NSS)
 #define USE_SSL
 #endif
 
diff --git a/src/interfaces/libpq/Makefile b/src/interfaces/libpq/Makefile
index d4919970f8..97821fb39b 100644
--- a/src/interfaces/libpq/Makefile
+++ b/src/interfaces/libpq/Makefile
@@ -57,6 +57,10 @@ OBJS += \
 	fe-secure-gssapi.o
 endif
 
+ifeq ($(with_nss), yes)
+OBJS += fe-secure-nss.o
+endif
+
 ifeq ($(PORTNAME), cygwin)
 override shlib = cyg$(NAME)$(DLSUFFIX)
 endif
diff --git a/src/interfaces/libpq/fe-connect.c b/src/interfaces/libpq/fe-connect.c
index 7bee9dd201..2814eb8ddd 100644
--- a/src/interfaces/libpq/fe-connect.c
+++ b/src/interfaces/libpq/fe-connect.c
@@ -354,6 +354,10 @@ static const internalPQconninfoOption PQconninfoOptions[] = {
 		"Target-Session-Attrs", "", 11, /* sizeof("read-write") = 11 */
 	offsetof(struct pg_conn, target_session_attrs)},
 
+	{"cert_database", NULL, NULL, NULL,
+		"CertificateDatabase", "", 64,
+	offsetof(struct pg_conn, cert_database)},
+
 	/* Terminating entry --- MUST BE LAST */
 	{NULL, NULL, NULL, NULL,
 	NULL, NULL, 0}
diff --git a/src/interfaces/libpq/fe-secure-nss.c b/src/interfaces/libpq/fe-secure-nss.c
new file mode 100644
index 0000000000..23969ade8e
--- /dev/null
+++ b/src/interfaces/libpq/fe-secure-nss.c
@@ -0,0 +1,962 @@
+/*-------------------------------------------------------------------------
+ *
+ * fe-secure-nss.c
+ *	  functions for supporting NSS as a TLS backend for frontend libpq
+ *
+ * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ *	  src/interfaces/libpq/fe-secure-nss.c
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#include "postgres_fe.h"
+
+#include "libpq-fe.h"
+#include "fe-auth.h"
+#include "libpq-int.h"
+
+/*
+ * BITS_PER_BYTE is also defined in the NSPR header fils, so we need to undef
+ * our version to avoid compiler warnings on redefinition.
+ */
+#define pg_BITS_PER_BYTE BITS_PER_BYTE
+#undef BITS_PER_BYTE
+
+/*
+ * The nspr/obsolete/protypes.h NSPR header typedefs uint64 and int64 with
+ * colliding definitions from ours, causing a much expected compiler error.
+ * The definitions are however not actually used in NSPR at all, and are only
+ * intended for what seems to be backwards compatibility for apps written
+ * against old versions of NSPR.  The following comment is in the referenced
+ * file, and was added in 1998:
+ *
+ *		This section typedefs the old 'native' types to the new PR<type>s.
+ *		These definitions are scheduled to be eliminated at the earliest
+ *		possible time. The NSPR API is implemented and documented using
+ *		the new definitions.
+ *
+ * As there is no opt-out from pulling in these typedefs, we define the guard
+ * for the file to exclude it. This is incredibly ugly, but seems to be about
+ * the only way around it.
+ */
+#define PROTYPES_H
+#include <nspr.h>
+#undef PROTYPES_H
+#include <nss.h>
+#include <ssl.h>
+#include <sslproto.h>
+#include <pk11func.h>
+#include <prerror.h>
+#include <prinit.h>
+#include <prio.h>
+#include <secerr.h>
+#include <secmod.h>
+
+/*
+ * Ensure that the colliding definitions match, else throw an error. In case
+ * NSPR remove the definition in a future version (however unlikely that may
+ * be, make sure to put ours back again.
+ */
+#if defined(BITS_PER_BYTE)
+#if BITS_PER_BYTE != pg_BITS_PER_BYTE
+#error "incompatible byte widths between NSPR and PostgreSQL"
+#endif
+#else
+#define BITS_PER_BYTE pg_BITS_PER_BYTE
+#endif
+#undef pg_BITS_PER_BYTE
+
+static SECStatus pg_load_nss_module(SECMODModule * *module, const char *library, const char *name);
+static SECStatus pg_bad_cert_handler(void *arg, PRFileDesc * fd);
+static char *pg_SSLerrmessage(PRErrorCode errcode);
+static SECStatus pg_client_auth_handler(void *arg, PRFileDesc * socket, CERTDistNames * caNames,
+										CERTCertificate * *pRetCert, SECKEYPrivateKey * *pRetKey);
+static SECStatus pg_cert_auth_handler(void *arg, PRFileDesc * fd, PRBool checksig, PRBool isServer);
+static int	ssl_protocol_version_to_nss(const char *protocol);
+static bool cert_database_has_CA(PGconn *conn);
+
+static char *PQssl_passwd_cb(PK11SlotInfo * slot, PRBool retry, void *arg);
+
+/*
+ * PR_ImportTCPSocket() is a private API, but very widely used, as it's the
+ * only way to make NSS use an already set up POSIX file descriptor rather
+ * than opening one itself. To quote the NSS documentation:
+ *
+ *		"In theory, code that uses PR_ImportTCPSocket may break when NSPR's
+ *		implementation changes. In practice, this is unlikely to happen because
+ *		NSPR's implementation has been stable for years and because of NSPR's
+ *		strong commitment to backward compatibility."
+ *
+ * https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSPR/Reference/PR_ImportTCPSocket
+ *
+ * The function is declared in <private/pprio.h>, but as it is a header marked
+ * private we declare it here rather than including it.
+ */
+NSPR_API(PRFileDesc *) PR_ImportTCPSocket(int);
+
+static SECMODModule * ca_trust = NULL;
+static NSSInitContext * nss_context = NULL;
+
+/*
+ * Track whether the NSS database has a password set or not. There is no API
+ * function for retrieving password status, so we simply flip this to true in
+ * case NSS invoked the password callback - as that will only happen in case
+ * there is a password. The reason for tracking this is that there are calls
+ * which require a password parameter, but doesn't use the callbacks provided,
+ * so we must call the callback on behalf of these.
+ */
+static bool has_password = false;
+
+#if defined(WIN32)
+static const char *ca_trust_name = "nssckbi.dll";
+#elif defined(__darwin__)
+static const char *ca_trust_name = "libnssckbi.dylib";
+#else
+static const char *ca_trust_name = "libnssckbi.so";
+#endif
+
+static PQsslKeyPassHook_nss_type PQsslKeyPassHook = NULL;
+
+/* ------------------------------------------------------------ */
+/*			 Procedures common to all secure sessions			*/
+/* ------------------------------------------------------------ */
+
+void
+pgtls_init_library(bool do_ssl, int do_crypto)
+{
+	/* TODO: implement me .. */
+}
+
+int
+pgtls_init(PGconn *conn)
+{
+	conn->ssl_in_use = false;
+
+	return 0;
+}
+
+void
+pgtls_close(PGconn *conn)
+{
+	if (nss_context)
+	{
+		NSS_ShutdownContext(nss_context);
+		nss_context = NULL;
+	}
+}
+
+PostgresPollingStatusType
+pgtls_open_client(PGconn *conn)
+{
+	SECStatus	status;
+	PRFileDesc *pr_fd;
+	PRFileDesc *model;
+	NSSInitParameters params;
+	SSLVersionRange desired_range;
+
+	/*
+	 * The NSPR documentation states that runtime initialization via PR_Init
+	 * is no longer required, as the first caller into NSPR will perform the
+	 * initialization implicitly. The documentation doesn't however clarify
+	 * from which version this is holds true, so let's perform the potentially
+	 * superfluous initialization anyways to avoid crashing on older versions
+	 * of NSPR, as there is no difference in overhead.  The NSS documentation
+	 * still states that PR_Init must be called in some way (implicitly or
+	 * explicitly).
+	 *
+	 * The below parameters are what the implicit initialization would've done
+	 * for us, and should work even for older versions where it might not be
+	 * done automatically. The last parameter, maxPTDs, is set to various
+	 * values in other codebases, but has been unused since NSPR 2.1 which was
+	 * released sometime in 1998.
+	 */
+	PR_Init(PR_USER_THREAD, PR_PRIORITY_NORMAL, 0);
+
+	/*
+	 * The original design of NSS was for a single application to use a single
+	 * copy of it, initialized with NSS_Initialize() which isn't returning any
+	 * handle with which to refer to NSS. NSS initialization and shutdown are
+	 * global for the application, so a shutdown in another NSS enabled
+	 * library would cause NSS to be stopped for libpq as well.  The fix has
+	 * been to introduce NSS_InitContext which returns a context handle to
+	 * pass to NSS_ShutdownContext.  NSS_InitContext was introduced in NSS
+	 * 3.12, but the use of it is not very well documented.
+	 * https://bugzilla.redhat.com/show_bug.cgi?id=738456
+	 *
+	 * The InitParameters struct passed can be used to override internal
+	 * values in NSS, but the usage is not documented at all. When using
+	 * NSS_Init initializations, the values are instead set via PK11_Configure
+	 * calls so the PK11_Configure documentation can be used to glean some
+	 * details on these.
+	 *
+	 * https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS/PKCS11/Module_Specs
+	 */
+	memset(&params, 0, sizeof(params));
+	params.length = sizeof(params);
+
+	if (conn->cert_database && strlen(conn->cert_database) > 0)
+	{
+		char	   *cert_database_path = psprintf("sql:%s", conn->cert_database);
+
+		nss_context = NSS_InitContext(cert_database_path, "", "", "",
+									  &params,
+									  NSS_INIT_READONLY | NSS_INIT_PK11RELOAD);
+		pfree(cert_database_path);
+	}
+	else
+		nss_context = NSS_InitContext("", "", "", "", &params,
+									  NSS_INIT_READONLY | NSS_INIT_NOCERTDB |
+									  NSS_INIT_NOMODDB | NSS_INIT_FORCEOPEN |
+									  NSS_INIT_NOROOTINIT | NSS_INIT_PK11RELOAD);
+
+	if (!nss_context)
+	{
+		char	   *err = pg_SSLerrmessage(PR_GetError());
+
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to %s certificate database: %s"),
+						  conn->cert_database ? "open" : "create",
+						  err);
+		free(err);
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * Configure cipher policy.
+	 */
+	status = NSS_SetDomesticPolicy();
+	if (status != SECSuccess)
+	{
+		char	   *err = pg_SSLerrmessage(PR_GetError());
+
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to configure cipher policy: %s"),
+						  err);
+		free(err);
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * If we don't have a certificate database, the system trust store is the
+	 * fallback we can use. If we fail to initialize that as well, we can
+	 * still attempt a connection as long as the sslmode isn't verify*.
+	 */
+	if (!conn->cert_database && conn->sslmode[0] == 'v')
+	{
+		status = pg_load_nss_module(&ca_trust, ca_trust_name, "\"Root Certificates\"");
+		/* status = pg_load_nss_module(&ca_trust, ca_trust_name, "trust"); */
+		if (status != SECSuccess)
+		{
+			char	   *err = pg_SSLerrmessage(PR_GetError());
+
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("WARNING: unable to load NSS trust module \"%s\" : %s"), ca_trust_name, err);
+			return PGRES_POLLING_FAILED;
+		}
+	}
+
+
+	PK11_SetPasswordFunc(PQssl_passwd_cb);
+
+	/*
+	 * Import the already opened socket as we don't want to use NSPR functions
+	 * for opening the network socket due to how the PostgreSQL protocol works
+	 * with TLS connections. This function is not part of the NSPR public API,
+	 * see the comment at the top of the file for the rationale of still using
+	 * it.
+	 */
+	pr_fd = PR_ImportTCPSocket(conn->sock);
+	if (!pr_fd)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to attach to socket: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * Most of the documentation available, and implementations of, NSS/NSPR
+	 * use the PR_NewTCPSocket() function here, which has the drawback that it
+	 * can only create IPv4 sockets. Instead use PR_OpenTCPSocket() which
+	 * copes with IPv6 as well.
+	 */
+	model = SSL_ImportFD(NULL, PR_OpenTCPSocket(conn->laddr.addr.ss_family));
+	if (!model)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to enable TLS: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/* Disable old protocol versions (SSLv2 and SSLv3) */
+	SSL_OptionSet(model, SSL_ENABLE_SSL2, PR_FALSE);
+	SSL_OptionSet(model, SSL_V2_COMPATIBLE_HELLO, PR_FALSE);
+	SSL_OptionSet(model, SSL_ENABLE_SSL3, PR_FALSE);
+
+#ifdef SSL_CBC_RANDOM_IV
+
+	/*
+	 * Enable protection against the BEAST attack in case the NSS library has
+	 * support for that. While SSLv3 is disabled, we may still allow TLSv1
+	 * which is affected. The option isn't documented as an SSL option, but as
+	 * an NSS environment variable.
+	 */
+	SSL_OptionSet(model, SSL_CBC_RANDOM_IV, PR_TRUE);
+#endif
+
+	/* Set us up as a TLS client for the handshake */
+	SSL_OptionSet(model, SSL_HANDSHAKE_AS_CLIENT, PR_TRUE);
+
+	/*
+	 * When setting the available protocols, we either use the user defined
+	 * configuration values, and if missing we accept whatever is the highest
+	 * version supported by the library as the max and only limit the range in
+	 * the other end at TLSv1.0. ssl_variant_stream is a ProtocolVariant enum
+	 * for Stream protocols, rather than datagram.
+	 */
+	SSL_VersionRangeGetSupported(ssl_variant_stream, &desired_range);
+	desired_range.min = SSL_LIBRARY_VERSION_TLS_1_0;
+
+	if (conn->ssl_min_protocol_version && strlen(conn->ssl_min_protocol_version) > 0)
+	{
+		int			ssl_min_ver = ssl_protocol_version_to_nss(conn->ssl_min_protocol_version);
+
+		if (ssl_min_ver == -1)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("invalid value \"%s\" for minimum version of SSL protocol\n"),
+							  conn->ssl_min_protocol_version);
+			return -1;
+		}
+
+		desired_range.min = ssl_min_ver;
+	}
+
+	if (conn->ssl_max_protocol_version && strlen(conn->ssl_max_protocol_version) > 0)
+	{
+		int			ssl_max_ver = ssl_protocol_version_to_nss(conn->ssl_max_protocol_version);
+
+		if (ssl_max_ver == -1)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("invalid value \"%s\" for maximum version of SSL protocol\n"),
+							  conn->ssl_max_protocol_version);
+			return -1;
+		}
+
+		desired_range.max = ssl_max_ver;
+	}
+
+	if (SSL_VersionRangeSet(model, &desired_range) != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to set allowed SSL protocol version range: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * Set up callback for verifying server certificates, as well as for how
+	 * to handle failed verifications.
+	 */
+	SSL_AuthCertificateHook(model, pg_cert_auth_handler, (void *) conn);
+	SSL_BadCertHook(model, pg_bad_cert_handler, (void *) conn);
+
+	/*
+	 * Convert the NSPR socket to an SSL socket. Ensuring the success of this
+	 * operation is critical as NSS SSL_* functions may return SECSuccess on
+	 * the socket even though SSL hasn't been enabled, which introduce a risk
+	 * of silent downgrades.
+	 */
+	conn->pr_fd = SSL_ImportFD(model, pr_fd);
+	if (!conn->pr_fd)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to configure client for TLS: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * The model can now we closed as we've applied the settings of the model
+	 * onto the real socket. From hereon we should only use conn->pr_fd.
+	 */
+	PR_Close(model);
+
+	/* Set the private data to be passed to the password callback */
+	SSL_SetPKCS11PinArg(conn->pr_fd, (void *) conn);
+
+	/*
+	 * If a CRL file has been specified, verify if it exists in the database
+	 * but don't fail in case it doesn't.
+	 */
+	if (conn->sslcrl && strlen(conn->sslcrl) > 0)
+	{
+		/* XXX: Implement me.. */
+	}
+
+	status = SSL_ResetHandshake(conn->pr_fd, PR_FALSE);
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to initiate handshake: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * Set callback for client authentication when requested by the server.
+	 */
+	SSL_GetClientAuthDataHook(conn->pr_fd, pg_client_auth_handler, (void *) conn);
+
+	/*
+	 * Specify which hostname we are expecting to talk to. This is required,
+	 * albeit mostly applies to when opening a connection to a traditional
+	 * http server it seems.
+	 */
+	SSL_SetURL(conn->pr_fd, (conn->connhost[conn->whichhost]).host);
+
+	do
+	{
+		status = SSL_ForceHandshake(conn->pr_fd);
+	}
+	while (status != SECSuccess && PR_GetError() == PR_WOULD_BLOCK_ERROR);
+
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("SSL error: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	conn->ssl_in_use = true;
+	return PGRES_POLLING_OK;
+}
+
+ssize_t
+pgtls_read(PGconn *conn, void *ptr, size_t len)
+{
+	PRInt32		nread;
+	PRErrorCode status;
+	int			read_errno = 0;
+
+	nread = PR_Recv(conn->pr_fd, ptr, len, 0, PR_INTERVAL_NO_WAIT);
+
+	/*
+	 * PR_Recv blocks until there is data to read or the timeout expires. Zero
+	 * is returned for closed connections, while -1 indicates an error within
+	 * the ongoing connection.
+	 */
+	if (nread == 0)
+	{
+		read_errno = ECONNRESET;
+		return -1;
+	}
+
+	if (nread == -1)
+	{
+		status = PR_GetError();
+
+		switch (status)
+		{
+			case PR_WOULD_BLOCK_ERROR:
+				read_errno = EINTR;
+				break;
+
+			case PR_IO_TIMEOUT_ERROR:
+				break;
+
+				/*
+				 * The error cases for PR_Recv are not documented, but can be
+				 * reverse engineered from _MD_unix_map_default_error() in the
+				 * NSPR code, defined in pr/src/md/unix/unix_errors.c.
+				 */
+			default:
+				printfPQExpBuffer(&conn->errorMessage,
+								  libpq_gettext("TLS read error: %s"),
+								  pg_SSLerrmessage(status));
+				break;
+		}
+	}
+
+	SOCK_ERRNO_SET(read_errno);
+	return (ssize_t) nread;
+}
+
+/*
+ * pgtls_read_pending
+ *		Check for the existence of data to be read.
+ *
+ * This is part of the PostgreSQL TLS backend API.
+ */
+bool
+pgtls_read_pending(PGconn *conn)
+{
+	unsigned char c;
+	int			n;
+
+	/*
+	 * PR_Recv peeks into the stream with the timeount turned off, to see if
+	 * there is another byte to read off the wire. There is an NSS function
+	 * SSL_DataPending() which might seem like a better fit, but it will only
+	 * check already encrypted data in the SSL buffer, not still unencrypted
+	 * data, thus it doesn't guarantee that a subsequent call to
+	 * PR_Read/PR_Recv wont block.
+	 */
+	n = PR_Recv(conn->pr_fd, &c, 1, PR_MSG_PEEK, PR_INTERVAL_NO_WAIT);
+	return (n > 0);
+}
+
+ssize_t
+pgtls_write(PGconn *conn, const void *ptr, size_t len)
+{
+	PRInt32		n;
+	PRErrorCode status;
+	int			write_errno = 0;
+
+	n = PR_Write(conn->pr_fd, ptr, len);
+
+	if (n < 0)
+	{
+		status = PR_GetError();
+
+		switch (status)
+		{
+			case PR_WOULD_BLOCK_ERROR:
+#ifdef EAGAIN
+				write_errno = EAGAIN;
+#else
+				write_errno = EINTR;
+#endif
+				break;
+
+			default:
+				printfPQExpBuffer(&conn->errorMessage,
+								  libpq_gettext("TLS write error: %s"),
+								  pg_SSLerrmessage(status));
+				write_errno = ECONNRESET;
+				break;
+		}
+	}
+
+	SOCK_ERRNO_SET(write_errno);
+	return (ssize_t) n;
+}
+
+/* ------------------------------------------------------------ */
+/*			PostgreSQL specific TLS support functions			*/
+/* ------------------------------------------------------------ */
+
+/*
+ * TODO: this a 99% copy of the same function in the backend, make these share
+ * a single implementation instead.
+ */
+static char *
+pg_SSLerrmessage(PRErrorCode errcode)
+{
+	const char *error;
+
+	error = PR_ErrorToName(errcode);
+	if (error)
+		return strdup(error);
+
+	return strdup("unknown TLS error");
+}
+
+static SECStatus
+pg_load_nss_module(SECMODModule * *module, const char *library, const char *name)
+{
+	SECMODModule *mod;
+	char	   *modulespec;
+
+	modulespec = psprintf("library=\"%s\", name=\"%s\"", library, name);
+
+	/*
+	 * Attempt to load the specified module. The second parameter is "parent"
+	 * which should always be NULL for application code. The third parameter
+	 * defines if loading should recurse which is only applicable when loading
+	 * a module from within another module. This hierarchy would have to be
+	 * defined in the modulespec, and since we don't support anything but
+	 * directly addressed modules we should pass PR_FALSE.
+	 */
+	mod = SECMOD_LoadUserModule(modulespec, NULL, PR_FALSE);
+	pfree(modulespec);
+
+	if (mod && mod->loaded)
+	{
+		*module = mod;
+		return SECSuccess;
+	}
+
+	SECMOD_DestroyModule(mod);
+	return SECFailure;
+}
+
+/* ------------------------------------------------------------ */
+/*						NSS Callbacks							*/
+/* ------------------------------------------------------------ */
+
+/*
+ * pg_cert_auth_handler
+ *			Callback for authenticating server certificate
+ *
+ * This is pretty much the same procedure as the SSL_AuthCertificate function
+ * provided by NSS, with the difference being server hostname validation. With
+ * SSL_AuthCertificate there is no way to do verify-ca, it only does the -full
+ * flavor of our sslmodes, so we need our own implementation.
+ */
+static SECStatus
+pg_cert_auth_handler(void *arg, PRFileDesc * fd, PRBool checksig, PRBool isServer)
+{
+	SECStatus	status;
+	PGconn	   *conn = (PGconn *) arg;
+	char	   *server_hostname = NULL;
+	CERTCertificate *server_cert;
+	void	   *pin;
+
+	Assert(!isServer);
+
+	pin = SSL_RevealPinArg(conn->pr_fd);
+	server_cert = SSL_PeerCertificate(conn->pr_fd);
+
+	status = CERT_VerifyCertificateNow((CERTCertDBHandle *) CERT_GetDefaultCertDB(), server_cert,
+									   checksig, certificateUsageSSLServer,
+									   pin, NULL);
+
+	/*
+	 * If we've already failed validation then there is no point in also
+	 * performing the hostname check for verify-full.
+	 */
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to verify certificate: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		goto done;
+	}
+
+	if (strcmp(conn->sslmode, "verify-full") == 0)
+	{
+		server_hostname = SSL_RevealURL(conn->pr_fd);
+		if (!server_hostname || server_hostname[0] == '\0')
+			goto done;
+
+		/*
+		 * CERT_VerifyCertName will internally perform RFC 2818 SubjectAltName
+		 * verification.
+		 */
+		status = CERT_VerifyCertName(server_cert, server_hostname);
+		if (status != SECSuccess)
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("unable to verify server hostname: %s"),
+							  pg_SSLerrmessage(PR_GetError()));
+
+	}
+
+done:
+	if (server_hostname)
+		PR_Free(server_hostname);
+
+	CERT_DestroyCertificate(server_cert);
+	return status;
+}
+
+/*
+ * pg_client_auth_handler
+ *		Callback for client certificate validation
+ *
+ * The client auth callback is not on by default in NSS, so we need to invoke
+ * it ourselves to ensure we can do cert authentication. A TODO is to support
+ * running without a specified sslcert parameter. By retrieving all the certs
+ * via nickname from the cert database and see if we find one which apply with
+ * NSS_CmpCertChainWCANames() and PK11_FindKeyByAnyCert() we could support
+ * just running with a ssl database specified.
+ *
+ * For now, we use the default client certificate validation which requires a
+ * defined nickname to identify the cert in the database.
+ */
+static SECStatus
+pg_client_auth_handler(void *arg, PRFileDesc * socket, CERTDistNames * caNames,
+					   CERTCertificate * *pRetCert, SECKEYPrivateKey * *pRetKey)
+{
+	PGconn	   *conn = (PGconn *) arg;
+
+	return NSS_GetClientAuthData(conn->sslcert, socket, caNames, pRetCert, pRetKey);
+}
+
+/*
+ * pg_bad_cert_handler
+ *		Callback for failed certificate validation
+ *
+ * The TLS handshake will call this function iff the server certificate failed
+ * validation. Depending on the sslmode, we allow the connection anyways.
+ */
+static SECStatus
+pg_bad_cert_handler(void *arg, PRFileDesc * fd)
+{
+	PGconn	   *conn = (PGconn *) arg;
+	PRErrorCode err;
+
+	/*
+	 * This really shouldn't happen, as we've the the PGconn object as our
+	 * callback data, and at the callsite we know it will be populated. That
+	 * being said, the NSS code itself performs this check even when it should
+	 * not be required so let's use the same belts with our suspenders.
+	 */
+	if (!arg)
+		return SECFailure;
+
+	/*
+	 * For sslmodes other than verify-full and verify-ca we don't perform peer
+	 * validation, so return immediately.  sslmode require with a database
+	 * specified which contains a CA certificate will work like verify-ca to
+	 * be compatible with the OpenSSL implementation.
+	 */
+	if (strcmp(conn->sslmode, "require") == 0)
+	{
+		if (conn->cert_database && strlen(conn->cert_database) > 0 && cert_database_has_CA(conn))
+			return SECFailure;
+	}
+	if (conn->sslmode[0] == 'v')
+		return SECFailure;
+
+	err = PORT_GetError();
+
+	/*
+	 * TODO: these are relevant error codes that can occur in certificate
+	 * validation, figure out which we dont want for require/prefer etc.
+	 */
+	switch (err)
+	{
+		case SEC_ERROR_INVALID_AVA:
+		case SEC_ERROR_INVALID_TIME:
+		case SEC_ERROR_BAD_SIGNATURE:
+		case SEC_ERROR_EXPIRED_CERTIFICATE:
+		case SEC_ERROR_UNKNOWN_ISSUER:
+		case SEC_ERROR_UNTRUSTED_ISSUER:
+		case SEC_ERROR_UNTRUSTED_CERT:
+		case SEC_ERROR_CERT_VALID:
+		case SEC_ERROR_EXPIRED_ISSUER_CERTIFICATE:
+		case SEC_ERROR_CRL_EXPIRED:
+		case SEC_ERROR_CRL_BAD_SIGNATURE:
+		case SEC_ERROR_EXTENSION_VALUE_INVALID:
+		case SEC_ERROR_CA_CERT_INVALID:
+		case SEC_ERROR_CERT_USAGES_INVALID:
+		case SEC_ERROR_UNKNOWN_CRITICAL_EXTENSION:
+			return SECSuccess;
+			break;
+		default:
+			return SECFailure;
+			break;
+	}
+
+	/* Unreachable */
+	return SECSuccess;
+}
+
+/* ------------------------------------------------------------ */
+/*					SSL information functions					*/
+/* ------------------------------------------------------------ */
+
+void *
+PQgetssl(PGconn *conn)
+{
+	/*
+	 * Always return NULL as this is legacy and defined to be equal to
+	 * PQsslStruct(conn, "OpenSSL"); This should ideally trigger a logged
+	 * warning somewhere as it's nonsensical to run in a non-OpenSSL build,
+	 * but the color of said bikeshed hasn't yet been determined.
+	 */
+	return NULL;
+}
+
+void *
+PQsslStruct(PGconn *conn, const char *struct_name)
+{
+	if (!conn)
+		return NULL;
+
+	/*
+	 * Return the underlying PRFileDesc which can be used to access
+	 * information on the connection details. There is no SSL context per se.
+	 */
+	if (strcmp(struct_name, "NSS") == 0)
+		return conn->pr_fd;
+	return NULL;
+}
+
+const char *const *
+PQsslAttributeNames(PGconn *conn)
+{
+	static const char *const result[] = {
+		"library",
+		"cipher",
+		"protocol",
+		"key_bits",
+		"compression",
+		NULL
+	};
+
+	return result;
+}
+
+const char *
+PQsslAttribute(PGconn *conn, const char *attribute_name)
+{
+	SECStatus	status;
+	SSLChannelInfo channel;
+	SSLCipherSuiteInfo suite;
+
+	if (!conn || !conn->pr_fd)
+		return NULL;
+
+	if (strcmp(attribute_name, "library") == 0)
+		return "NSS";
+
+	status = SSL_GetChannelInfo(conn->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+		return NULL;
+
+	status = SSL_GetCipherSuiteInfo(channel.cipherSuite, &suite, sizeof(suite));
+	if (status != SECSuccess)
+		return NULL;
+
+	if (strcmp(attribute_name, "cipher") == 0)
+		return suite.cipherSuiteName;
+
+	if (strcmp(attribute_name, "key_bits") == 0)
+	{
+		static char key_bits_str[8];
+
+		snprintf(key_bits_str, sizeof(key_bits_str), "%i", suite.effectiveKeyBits);
+		return key_bits_str;
+	}
+
+	if (strcmp(attribute_name, "protocol") == 0)
+	{
+		switch (channel.protocolVersion)
+		{
+#ifdef SSL_LIBRARY_VERSION_TLS_1_3
+			case SSL_LIBRARY_VERSION_TLS_1_3:
+				return "TLSv1.3";
+#endif
+#ifdef SSL_LIBRARY_VERSION_TLS_1_2
+			case SSL_LIBRARY_VERSION_TLS_1_2:
+				return "TLSv1.2";
+#endif
+#ifdef SSL_LIBRARY_VERSION_TLS_1_1
+			case SSL_LIBRARY_VERSION_TLS_1_1:
+				return "TLSv1.1";
+#endif
+			case SSL_LIBRARY_VERSION_TLS_1_0:
+				return "TLSv1.0";
+			default:
+				return "unknown";
+		}
+	}
+
+	/*
+	 * NSS disabled support for compression in version 3.33, and it was only
+	 * available for SSLv3 at that point anyways, so we can safely return off
+	 * here without checking.
+	 */
+	if (strcmp(attribute_name, "compression") == 0)
+		return "off";
+
+	return NULL;
+}
+
+static int
+ssl_protocol_version_to_nss(const char *protocol)
+{
+	if (pg_strcasecmp("TLSv1", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_0;
+
+#ifdef SSL_LIBRARY_VERSION_TLS_1_1
+	if (pg_strcasecmp("TLSv1.1", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_1;
+#endif
+
+#ifdef SSL_LIBRARY_VERSION_TLS_1_2
+	if (pg_strcasecmp("TLSv1.2", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_2;
+#endif
+
+#ifdef SSL_LIBRARY_VERSION_TLS_1_3
+	if (pg_strcasecmp("TLSv1.3", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_3;
+#endif
+
+	return -1;
+}
+
+static bool
+cert_database_has_CA(PGconn *conn)
+{
+	CERTCertList *certificates;
+	bool		hasCA;
+
+	/*
+	 * If the certificate database has a password we must provide it, since
+	 * this API doesn't invoke the standard password callback.
+	 */
+	if (has_password)
+		certificates = PK11_ListCerts(PK11CertListCA, PQssl_passwd_cb(NULL, PR_FALSE, (void *) conn));
+	else
+		certificates = PK11_ListCerts(PK11CertListCA, NULL);
+	hasCA = !CERT_LIST_EMPTY(certificates);
+	CERT_DestroyCertList(certificates);
+
+	return hasCA;
+}
+
+PQsslKeyPassHook_nss_type
+PQgetSSLKeyPassHook_nss(void)
+{
+	return PQsslKeyPassHook;
+}
+
+void
+PQsetSSLKeyPassHook_nss(PQsslKeyPassHook_nss_type hook)
+{
+	PQsslKeyPassHook = hook;
+}
+
+/*
+ * Supply a password to decrypt a client certificate.
+ *
+ * This must match NSS type PK11PasswordFunc.
+ */
+static char *
+PQssl_passwd_cb(PK11SlotInfo * slot, PRBool retry, void *arg)
+{
+	has_password = true;
+
+	if (PQsslKeyPassHook)
+		return PQsslKeyPassHook(slot, (PRBool) retry, arg);
+	else
+		return PQdefaultSSLKeyPassHook_nss(slot, retry, arg);
+}
+
+/*
+ * The default password handler callback.
+ */
+char *
+PQdefaultSSLKeyPassHook_nss(PK11SlotInfo * slot, PRBool retry, void *arg)
+{
+	PGconn	   *conn = (PGconn *) arg;
+
+	/*
+	 * If the password didn't work the first time there is no point in
+	 * retrying as it hasn't changed.
+	 */
+	if (retry != PR_TRUE && conn->sslpassword && strlen(conn->sslpassword) > 0)
+		return PORT_Strdup(conn->sslpassword);
+
+	return NULL;
+}
diff --git a/src/interfaces/libpq/libpq-fe.h b/src/interfaces/libpq/libpq-fe.h
index 3b6a9fbce3..27c16e187f 100644
--- a/src/interfaces/libpq/libpq-fe.h
+++ b/src/interfaces/libpq/libpq-fe.h
@@ -625,6 +625,17 @@ extern PQsslKeyPassHook_OpenSSL_type PQgetSSLKeyPassHook_OpenSSL(void);
 extern void PQsetSSLKeyPassHook_OpenSSL(PQsslKeyPassHook_OpenSSL_type hook);
 extern int	PQdefaultSSLKeyPassHook_OpenSSL(char *buf, int size, PGconn *conn);
 
+/* == in fe-secure-nss.c === */
+typedef struct PK11SlotInfoStr PK11SlotInfo;
+typedef int PRIntn;
+typedef PRIntn PRBool;
+
+/* Support for overriding sslpassword handling with a callback. */
+typedef char *(*PQsslKeyPassHook_nss_type) (PK11SlotInfo * slot, PRBool retry, void *arg);
+extern PQsslKeyPassHook_nss_type PQgetSSLKeyPassHook_nss(void);
+extern void PQsetSSLKeyPassHook_nss(PQsslKeyPassHook_nss_type hook);
+extern char *PQdefaultSSLKeyPassHook_nss(PK11SlotInfo * slot, PRBool retry, void *arg);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/src/interfaces/libpq/libpq-int.h b/src/interfaces/libpq/libpq-int.h
index 1de91ae295..12717ca720 100644
--- a/src/interfaces/libpq/libpq-int.h
+++ b/src/interfaces/libpq/libpq-int.h
@@ -362,6 +362,7 @@ struct pg_conn
 	char	   *sslpassword;	/* client key file password */
 	char	   *sslrootcert;	/* root certificate filename */
 	char	   *sslcrl;			/* certificate revocation list filename */
+	char	   *cert_database;
 	char	   *requirepeer;	/* required peer credentials for local sockets */
 	char	   *gssencmode;		/* GSS mode (require,prefer,disable) */
 	char	   *krbsrvname;		/* Kerberos service name */
@@ -485,6 +486,10 @@ struct pg_conn
 								 * OpenSSL version changes */
 #endif
 #endif							/* USE_OPENSSL */
+
+#ifdef USE_NSS
+	void	   *pr_fd;
+#endif							/* USE_NSS */
 #endif							/* USE_SSL */
 
 #ifdef ENABLE_GSS
diff --git a/src/test/Makefile b/src/test/Makefile
index efb206aa75..d18f5a083b 100644
--- a/src/test/Makefile
+++ b/src/test/Makefile
@@ -27,7 +27,7 @@ ifneq (,$(filter ldap,$(PG_TEST_EXTRA)))
 SUBDIRS += ldap
 endif
 endif
-ifeq ($(with_openssl),yes)
+ifeq ($(with_ssl),yes)
 ifneq (,$(filter ssl,$(PG_TEST_EXTRA)))
 SUBDIRS += ssl
 endif
diff --git a/src/test/ssl/Makefile b/src/test/ssl/Makefile
index 777ee39413..fe265e2dbd 100644
--- a/src/test/ssl/Makefile
+++ b/src/test/ssl/Makefile
@@ -14,6 +14,7 @@ top_builddir = ../../..
 include $(top_builddir)/src/Makefile.global
 
 export with_openssl
+export with_nss
 
 CERTIFICATES := server_ca server-cn-and-alt-names \
 	server-cn-only server-single-alt-name server-multiple-alt-names \
@@ -30,6 +31,32 @@ SSLFILES := $(CERTIFICATES:%=ssl/%.key) $(CERTIFICATES:%=ssl/%.crt) \
 	ssl/client+client_ca.crt ssl/client-der.key \
 	ssl/client-encrypted-pem.key ssl/client-encrypted-der.key
 
+# Even though we in practice could get away with far fewer NSS databases, they
+# are generated to mimick the setup for the OpenSSL tests in order to ensure
+# we isolate the same behavior between the backends. The database name should
+# contain the files included for easier test suite code reading.
+NSSFILES := ssl/nss/client_ca.crt.db \
+	ssl/nss/server_ca.crt.db \
+	ssl/nss/root+server_ca.crt.db \
+	ssl/nss/root+client_ca.crt.db \
+	ssl/nss/client.crt__client.key.db \
+	ssl/nss/client-revoked.crt__client-revoked.key.db \
+	ssl/nss/server-cn-only.crt__server-password.key.db \
+	ssl/nss/server-cn-only.crt__server-cn-only.key.db \
+	ssl/nss/root.crl \
+	ssl/nss/server.crl \
+	ssl/nss/client.crl \
+	ssl/nss/server-multiple-alt-names.crt__server-multiple-alt-names.key.db \
+	ssl/nss/server-single-alt-name.crt__server-single-alt-name.key.db \
+	ssl/nss/server-cn-and-alt-names.crt__server-cn-and-alt-names.key.db \
+	ssl/nss/server-no-names.crt__server-no-names.key.db \
+	ssl/nss/server-revoked.crt__server-revoked.key.db \
+	ssl/nss/root+client.crl \
+	ssl/nss/client+client_ca.crt__client.key.db \
+	ssl/nss/client.crt__client-encrypted-pem.key.db \
+	ssl/nss/root+server_ca.crt__server.crl.db \
+	ssl/nss/root+server_ca.crt__root+server.crl.db
+
 # This target re-generates all the key and certificate files. Usually we just
 # use the ones that are committed to the tree without rebuilding them.
 #
@@ -37,6 +64,10 @@ SSLFILES := $(CERTIFICATES:%=ssl/%.key) $(CERTIFICATES:%=ssl/%.crt) \
 #
 sslfiles: $(SSLFILES)
 
+# Generate NSS certificate databases corresponding to the OpenSSL certificates.
+# This target will fail unless preceded by nssfiles-clean.
+nssfiles: $(NSSFILES)
+
 # OpenSSL requires a directory to put all generated certificates in. We don't
 # use this for anything, but we need a location.
 ssl/new_certs_dir:
@@ -64,6 +95,24 @@ ssl/%_ca.crt: ssl/%_ca.key %_ca.config ssl/root_ca.crt ssl/new_certs_dir
 	rm ssl/temp_ca.crt ssl/temp_ca_signed.crt
 	echo "01" > ssl/$*_ca.srl
 
+ssl/nss/%_ca.crt.db: ssl/%_ca.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n $*_ca.crt -i ssl/$*_ca.crt -t "CT,C,C"
+
+ssl/nss/root+server_ca.crt__server.crl.db: ssl/root+server_ca.crt ssl/nss/server.crl
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	crlutil -I -i ssl/nss/server.crl -d $@ -B
+
+ssl/nss/root+server_ca.crt__root+server.crl.db: ssl/root+server_ca.crt ssl/nss/root.crl ssl/nss/server.crl
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	crlutil -I -i ssl/nss/root.crl -d $@ -B
+	crlutil -I -i ssl/nss/server.crl -d $@ -B
+
 # Server certificates, signed by server CA:
 ssl/server-%.crt: ssl/server-%.key ssl/server_ca.crt server-%.config
 	openssl req -new -key ssl/server-$*.key -out ssl/server-$*.csr -config server-$*.config
@@ -77,6 +126,74 @@ ssl/server-ss.crt: ssl/server-cn-only.key ssl/server-cn-only.crt server-cn-only.
 	openssl x509 -req -days 10000 -in ssl/server-ss.csr -signkey ssl/server-cn-only.key -out ssl/server-ss.crt  -extensions v3_req -extfile server-cn-only.config
 	rm ssl/server-ss.csr
 
+ssl/nss/server-cn-only.crt__server-password.key.db: ssl/server-cn-only.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-cn-only.crt -i ssl/server-cn-only.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-password.pfx -inkey ssl/server-password.key -in ssl/server-cn-only.crt -certfile ssl/server_ca.crt -passin 'pass:secret1' -passout pass:
+	pk12util -i ssl/nss/server-password.pfx -d $@ -W ''
+
+ssl/nss/server-cn-only.crt__server-cn-only.key.db: ssl/server-cn-only.crt ssl/server-cn-only.key
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-cn-only.crt -i ssl/server-cn-only.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-cn-only.pfx -inkey ssl/server-cn-only.key -in ssl/server-cn-only.crt -certfile ssl/server_ca.crt -passout pass:
+	pk12util -i ssl/nss/server-cn-only.pfx -d $@ -W ''
+
+ssl/nss/server-multiple-alt-names.crt__server-multiple-alt-names.key.db: ssl/server-multiple-alt-names.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-multiple-alt-names.crt -i ssl/server-multiple-alt-names.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-multiple-alt-names.pfx -inkey ssl/server-multiple-alt-names.key -in ssl/server-multiple-alt-names.crt -certfile ssl/server-multiple-alt-names.crt -passout pass:
+	pk12util -i ssl/nss/server-multiple-alt-names.pfx -d $@ -W ''
+
+ssl/nss/server-single-alt-name.crt__server-single-alt-name.key.db: ssl/server-single-alt-name.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-single-alt-name.crt -i ssl/server-single-alt-name.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-single-alt-name.pfx -inkey ssl/server-single-alt-name.key -in ssl/server-single-alt-name.crt -certfile ssl/server-single-alt-name.crt -passout pass:
+	pk12util -i ssl/nss/server-single-alt-name.pfx -d $@ -W ''
+
+ssl/nss/server-cn-and-alt-names.crt__server-cn-and-alt-names.key.db: ssl/server-cn-and-alt-names.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-cn-and-alt-names.crt -i ssl/server-cn-and-alt-names.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-cn-and-alt-names.pfx -inkey ssl/server-cn-and-alt-names.key -in ssl/server-cn-and-alt-names.crt -certfile ssl/server-cn-and-alt-names.crt -passout pass:
+	pk12util -i ssl/nss/server-cn-and-alt-names.pfx -d $@ -W ''
+
+ssl/nss/server-no-names.crt__server-no-names.key.db: ssl/server-no-names.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-no-names.crt -i ssl/server-no-names.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-no-names.pfx -inkey ssl/server-no-names.key -in ssl/server-no-names.crt -certfile ssl/server-no-names.crt -passout pass:
+	pk12util -i ssl/nss/server-no-names.pfx -d $@ -W ''
+
+ssl/nss/server-revoked.crt__server-revoked.key.db: ssl/server-revoked.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-revoked.crt -i ssl/server-revoked.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-revoked.pfx -inkey ssl/server-revoked.key -in ssl/server-revoked.crt -certfile ssl/server-revoked.crt -passout pass:
+	pk12util -i ssl/nss/server-revoked.pfx -d $@ -W ''
+
 # Password-protected version of server-cn-only.key
 ssl/server-password.key: ssl/server-cn-only.key
 	openssl rsa -aes256 -in $< -out $@ -passout 'pass:secret1'
@@ -88,6 +205,27 @@ ssl/client.crt: ssl/client.key ssl/client_ca.crt
 	openssl x509 -in ssl/temp.crt -out ssl/client.crt # to keep just the PEM cert
 	rm ssl/client.csr ssl/temp.crt
 
+# Client certificate, signed by client CA
+ssl/nss/client.crt__client.key.db: ssl/client.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/client.crt -i ssl/client.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root+client_ca.crt -i ssl/root+client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client.pfx -inkey ssl/client.key -in ssl/client.crt -certfile ssl/client_ca.crt -passout pass:
+	pk12util -i ssl/nss/client.pfx -d $@ -W ''
+
+# Client certificate with encrypted key, signed by client CA
+ssl/nss/client.crt__client-encrypted-pem.key.db: ssl/client.crt
+	$(MKDIR_P) $@
+	echo 'dUmmyP^#+' > $@.pass
+	certutil -d "sql:$@" -N -f $@.pass
+	certutil -d "sql:$@" -A -f $@.pass -n ssl/client.crt -i ssl/client.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -f $@.pass -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -f $@.pass -n root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client-encrypted-pem.pfx -inkey ssl/client-encrypted-pem.key -in ssl/client.crt -certfile ssl/client_ca.crt -passin pass:'dUmmyP^#+' -passout pass:'dUmmyP^#+'
+	pk12util -i ssl/nss/client-encrypted-pem.pfx -d $@ -W 'dUmmyP^#+' -k $@.pass
+
 # Another client certificate, signed by the client CA. This one is revoked.
 ssl/client-revoked.crt: ssl/client-revoked.key ssl/client_ca.crt client.config
 	openssl req -new -key ssl/client-revoked.key -out ssl/client-revoked.csr -config client.config
@@ -95,6 +233,14 @@ ssl/client-revoked.crt: ssl/client-revoked.key ssl/client_ca.crt client.config
 	openssl x509 -in ssl/temp.crt -out ssl/client-revoked.crt # to keep just the PEM cert
 	rm ssl/client-revoked.csr ssl/temp.crt
 
+ssl/nss/client-revoked.crt__client-revoked.key.db: ssl/client-revoked.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/client-revoked.crt -i ssl/client-revoked.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client-revoked.pfx -inkey ssl/client-revoked.key -in ssl/client-revoked.crt -certfile ssl/client_ca.crt -passout pass:
+	pk12util -i ssl/nss/client-revoked.pfx -d $@ -W ''
+
 # Convert the key to DER, to test our behaviour there too
 ssl/client-der.key: ssl/client.key
 	openssl rsa -in ssl/client.key -outform DER -out ssl/client-der.key
@@ -127,19 +273,40 @@ ssl/root+client_ca.crt: ssl/root_ca.crt ssl/client_ca.crt
 ssl/client+client_ca.crt: ssl/client.crt ssl/client_ca.crt
 	cat $^ > $@
 
+# Client certificate, signed by client CA
+ssl/nss/client+client_ca.crt__client.key.db: ssl/client+client_ca.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/client+client_ca.crt -i ssl/client+client_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n ssl/root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client.pfx -inkey ssl/client.key -in ssl/client.crt -certfile ssl/client_ca.crt -passout pass:
+	pk12util -i ssl/nss/client.pfx -d $@ -W ''
+
 #### CRLs
 
 ssl/client.crl: ssl/client-revoked.crt
 	openssl ca -config cas.config -name client_ca -revoke ssl/client-revoked.crt
 	openssl ca -config cas.config -name client_ca -gencrl -out ssl/client.crl
 
+ssl/nss/client.crl: ssl/client.crl
+	openssl crl -in $^ -outform der -out $@
+
 ssl/server.crl: ssl/server-revoked.crt
 	openssl ca -config cas.config -name server_ca -revoke ssl/server-revoked.crt
 	openssl ca -config cas.config -name server_ca -gencrl -out ssl/server.crl
 
+ssl/nss/server.crl: ssl/server.crl
+	openssl crl -in $^ -outform der -out $@
+
 ssl/root.crl: ssl/root_ca.crt
 	openssl ca -config cas.config -name root_ca -gencrl -out ssl/root.crl
 
+ssl/nss/root.crl: ssl/root.crl
+	openssl crl -in $^ -outform der -out $@
+
+ssl/nss/root+client.crl: ssl/root+client.crl
+	openssl crl -in $^ -outform der -out $@
+
 # If a CRL is used, OpenSSL requires a CRL file for *all* the CAs in the
 # chain, even if some of them are empty.
 ssl/root+server.crl: ssl/root.crl ssl/server.crl
@@ -151,9 +318,14 @@ ssl/root+client.crl: ssl/root.crl ssl/client.crl
 sslfiles-clean:
 	rm -f $(SSLFILES) ssl/client_ca.srl ssl/server_ca.srl ssl/client_ca-certindex* ssl/server_ca-certindex* ssl/root_ca-certindex* ssl/root_ca.srl ssl/temp_ca.crt ssl/temp_ca_signed.crt
 
+.PHONY: nssfiles-clean
+nssfiles-clean:
+	rm -rf ssl/nss
+
 clean distclean maintainer-clean:
 	rm -rf tmp_check
 	rm -rf ssl/*.old ssl/new_certs_dir ssl/client*_tmp.key
+	rm -rf ssl/nss
 
 # Doesn't depend on $(SSLFILES) because we don't rebuild them by default
 check:
diff --git a/src/test/ssl/t/001_ssltests.pl b/src/test/ssl/t/001_ssltests.pl
index fd2727b568..c27313f86d 100644
--- a/src/test/ssl/t/001_ssltests.pl
+++ b/src/test/ssl/t/001_ssltests.pl
@@ -4,15 +4,22 @@ use PostgresNode;
 use TestLib;
 use Test::More;
 
-use File::Copy;
-
 use FindBin;
 use lib $FindBin::RealBin;
 
-use SSLServer;
+use SSL::Server;
+
+my $openssl;
+my $nss;
 
 if ($ENV{with_openssl} eq 'yes')
 {
+	$openssl = 1;
+	plan tests => 93;
+}
+elsif ($ENV{with_nss} eq 'yes')
+{
+	$nss = 1;
 	plan tests => 93;
 }
 else
@@ -32,32 +39,6 @@ my $SERVERHOSTCIDR = '127.0.0.1/32';
 # Allocation of base connection string shared among multiple tests.
 my $common_connstr;
 
-# The client's private key must not be world-readable, so take a copy
-# of the key stored in the code tree and update its permissions.
-#
-# This changes ssl/client.key to ssl/client_tmp.key etc for the rest
-# of the tests.
-my @keys = (
-	"client",     "client-revoked",
-	"client-der", "client-encrypted-pem",
-	"client-encrypted-der");
-foreach my $key (@keys)
-{
-	copy("ssl/${key}.key", "ssl/${key}_tmp.key")
-	  or die
-	  "couldn't copy ssl/${key}.key to ssl/${key}_tmp.key for permissions change: $!";
-	chmod 0600, "ssl/${key}_tmp.key"
-	  or die "failed to change permissions on ssl/${key}_tmp.key: $!";
-}
-
-# Also make a copy of that explicitly world-readable.  We can't
-# necessarily rely on the file in the source tree having those
-# permissions.  Add it to @keys to include it in the final clean
-# up phase.
-copy("ssl/client.key", "ssl/client_wrongperms_tmp.key");
-chmod 0644, "ssl/client_wrongperms_tmp.key";
-push @keys, 'client_wrongperms';
-
 #### Set up the server.
 
 note "setting up data directory";
@@ -72,32 +53,28 @@ $node->start;
 
 # Run this before we lock down access below.
 my $result = $node->safe_psql('postgres', "SHOW ssl_library");
-is($result, 'OpenSSL', 'ssl_library parameter');
+is($result, SSL::Server::ssl_library(), 'ssl_library parameter');
 
 configure_test_server_for_ssl($node, $SERVERHOSTADDR, $SERVERHOSTCIDR,
 	'trust');
 
 note "testing password-protected keys";
 
-open my $sslconf, '>', $node->data_dir . "/sslconfig.conf";
-print $sslconf "ssl=on\n";
-print $sslconf "ssl_cert_file='server-cn-only.crt'\n";
-print $sslconf "ssl_key_file='server-password.key'\n";
-print $sslconf "ssl_passphrase_command='echo wrongpassword'\n";
-close $sslconf;
-
-command_fails(
-	[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
-	'restart fails with password-protected key file with wrong password');
-$node->_update_pid(0);
-
-open $sslconf, '>', $node->data_dir . "/sslconfig.conf";
-print $sslconf "ssl=on\n";
-print $sslconf "ssl_cert_file='server-cn-only.crt'\n";
-print $sslconf "ssl_key_file='server-password.key'\n";
-print $sslconf "ssl_passphrase_command='echo secret1'\n";
-close $sslconf;
+SKIP:
+{
+	skip "Certificate passphrases aren't checked on server restart in NSS", 1
+	  if ($nss);
+
+	switch_server_cert($node, 'server-cn-only', 'root+client_ca',
+		'server-password', 'echo wrongpassword');
+	command_fails(
+		[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
+		'restart fails with password-protected key file with wrong password');
+	$node->_update_pid(0);
+}
 
+switch_server_cert($node, 'server-cn-only', 'root+client_ca',
+	'server-password', 'echo secret1');
 command_ok(
 	[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
 	'restart succeeds with password-protected key file');
@@ -149,82 +126,105 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"sslrootcert=invalid sslmode=verify-ca",
-	qr/root certificate file "invalid" does not exist/,
+	qr/root certificate file "invalid" does not exist|could not connect to server/,
 	"connect without server root cert sslmode=verify-ca");
 test_connect_fails(
 	$common_connstr,
 	"sslrootcert=invalid sslmode=verify-full",
-	qr/root certificate file "invalid" does not exist/,
+	qr/root certificate file "invalid" does not exist|could not connect to server/,
 	"connect without server root cert sslmode=verify-full");
 
 # Try with wrong root cert, should fail. (We're using the client CA as the
 # root, but the server's key is signed by the server CA.)
-test_connect_fails($common_connstr,
-	"sslrootcert=ssl/client_ca.crt sslmode=require",
-	qr/SSL error/, "connect with wrong server root cert sslmode=require");
-test_connect_fails($common_connstr,
-	"sslrootcert=ssl/client_ca.crt sslmode=verify-ca",
-	qr/SSL error/, "connect with wrong server root cert sslmode=verify-ca");
-test_connect_fails($common_connstr,
-	"sslrootcert=ssl/client_ca.crt sslmode=verify-full",
-	qr/SSL error/, "connect with wrong server root cert sslmode=verify-full");
-
-# Try with just the server CA's cert. This fails because the root file
-# must contain the whole chain up to the root CA.
-test_connect_fails($common_connstr,
-	"sslrootcert=ssl/server_ca.crt sslmode=verify-ca",
-	qr/SSL error/, "connect with server CA cert, without root CA");
+test_connect_fails(
+	$common_connstr,
+	"sslrootcert=ssl/client_ca.crt sslmode=require cert_database=ssl/nss/client_ca.crt.db",
+	qr/SSL error/,
+	"connect with wrong server root cert sslmode=require");
+test_connect_fails(
+	$common_connstr,
+	"sslrootcert=ssl/client_ca.crt sslmode=verify-ca cert_database=ssl/nss/client_ca.crt.db",
+	qr/SSL error/,
+	"connect with wrong server root cert sslmode=verify-ca");
+test_connect_fails(
+	$common_connstr,
+	"sslrootcert=ssl/client_ca.crt sslmode=verify-full cert_database=ssl/nss/client_ca.crt.db",
+	qr/SSL error/,
+	"connect with wrong server root cert sslmode=verify-full");
+
+SKIP:
+{
+	# NSS supports partial chain validation, so this test doesnt work there.
+	# This is similar to the OpenSSL option X509_V_FLAG_PARTIAL_CHAIN which
+	# we don't allow.
+	skip "NSS support partial chain validation", 2 if ($nss);
+	# Try with just the server CA's cert. This fails because the root file
+	# must contain the whole chain up to the root CA.
+	test_connect_fails($common_connstr,
+		"sslrootcert=ssl/server_ca.crt sslmode=verify-ca",
+		qr/SSL error/, "connect with server CA cert, without root CA");
+}
 
 # And finally, with the correct root cert.
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require cert_database=ssl/nss/root+server_ca.crt.db",
 	"connect with correct server CA cert file sslmode=require");
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca cert_database=ssl/nss/root+server_ca.crt.db",
 	"connect with correct server CA cert file sslmode=verify-ca");
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-full",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db",
 	"connect with correct server CA cert file sslmode=verify-full");
 
-# Test with cert root file that contains two certificates. The client should
-# be able to pick the right one, regardless of the order in the file.
-test_connect_ok(
-	$common_connstr,
-	"sslrootcert=ssl/both-cas-1.crt sslmode=verify-ca",
-	"cert root file that contains two certificates, order 1");
-test_connect_ok(
-	$common_connstr,
-	"sslrootcert=ssl/both-cas-2.crt sslmode=verify-ca",
-	"cert root file that contains two certificates, order 2");
+SKIP:
+{
+	skip "CA ordering is irrelevant in NSS databases", 2 if ($nss);
+
+	# Test with cert root file that contains two certificates. The client should
+	# be able to pick the right one, regardless of the order in the file.
+	test_connect_ok(
+		$common_connstr,
+		"sslrootcert=ssl/both-cas-1.crt sslmode=verify-ca",
+		"cert root file that contains two certificates, order 1");
 
+	# How about import the both-file into a database?
+	test_connect_ok(
+		$common_connstr,
+		"sslrootcert=ssl/both-cas-2.crt sslmode=verify-ca",
+		"cert root file that contains two certificates, order 2");
+}
 # CRL tests
 
 # Invalid CRL filename is the same as no CRL, succeeds
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=invalid",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=invalid cert_database=ssl/nss/root+server_ca.crt.db",
 	"sslcrl option with invalid file name");
 
-# A CRL belonging to a different CA is not accepted, fails
-test_connect_fails(
-	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/client.crl",
-	qr/SSL error/,
-	"CRL belonging to a different CA");
+SKIP:
+{
+	skip "CRL's are verified when adding to NSS database", 2 if ($nss);
+	# A CRL belonging to a different CA is not accepted, fails
+	test_connect_fails(
+		$common_connstr,
+		"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/client.crl",
+		qr/SSL error/,
+		"CRL belonging to a different CA");
+}
 
 # With the correct CRL, succeeds (this cert is not revoked)
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/root+server.crl",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/root+server.crl cert_database=ssl/nss/root+server_ca.crt__root+server.crl.db",
 	"CRL with a non-revoked cert");
 
 # Check that connecting with verify-full fails, when the hostname doesn't
 # match the hostname in the server's certificate.
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -237,14 +237,14 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"sslmode=verify-full host=wronghost.test",
-	qr/\Qserver certificate for "common-name.pg-ssltest.test" does not match host name "wronghost.test"\E/,
+	qr/\Qserver certificate for "common-name.pg-ssltest.test" does not match host name "wronghost.test"\E|SSL_ERROR_BAD_CERT_DOMAIN/,
 	"mismatch between host name and server certificate sslmode=verify-full");
 
 # Test Subject Alternative Names.
 switch_server_cert($node, 'server-multiple-alt-names');
 
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -262,12 +262,12 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"host=wronghost.alt-name.pg-ssltest.test",
-	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "wronghost.alt-name.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "wronghost.alt-name.pg-ssltest.test"\E|SSL_ERROR_BAD_CERT_DOMAIN/,
 	"host name not matching with X.509 Subject Alternative Names");
 test_connect_fails(
 	$common_connstr,
 	"host=deep.subdomain.wildcard.pg-ssltest.test",
-	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E|SSL_ERROR_BAD_CERT_DOMAIN/,
 	"host name not matching with X.509 Subject Alternative Names wildcard");
 
 # Test certificate with a single Subject Alternative Name. (this gives a
@@ -275,7 +275,7 @@ test_connect_fails(
 switch_server_cert($node, 'server-single-alt-name');
 
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -285,12 +285,12 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"host=wronghost.alt-name.pg-ssltest.test",
-	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "wronghost.alt-name.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "wronghost.alt-name.pg-ssltest.test"\E|SSL_ERROR_BAD_CERT_DOMAIN/,
 	"host name not matching with a single X.509 Subject Alternative Name");
 test_connect_fails(
 	$common_connstr,
 	"host=deep.subdomain.wildcard.pg-ssltest.test",
-	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E|SSL_ERROR_BAD_CERT_DOMAIN/,
 	"host name not matching with a single X.509 Subject Alternative Name wildcard"
 );
 
@@ -299,7 +299,7 @@ test_connect_fails(
 switch_server_cert($node, 'server-cn-and-alt-names');
 
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -312,14 +312,14 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"host=common-name.pg-ssltest.test",
-	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 1 other name) does not match host name "common-name.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 1 other name) does not match host name "common-name.pg-ssltest.test"\E|SSL_ERROR_BAD_CERT_DOMAIN/,
 	"certificate with both a CN and SANs ignores CN");
 
 # Finally, test a server certificate that has no CN or SANs. Of course, that's
 # not a very sensible certificate, but libpq should handle it gracefully.
 switch_server_cert($node, 'server-no-names');
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -328,7 +328,7 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"sslmode=verify-full host=common-name.pg-ssltest.test",
-	qr/could not get server's host name from server certificate/,
+	qr/could not get server's host name from server certificate|SSL_ERROR_BAD_CERT_DOMAIN/,
 	"server certificate without CN or SANs sslmode=verify-full");
 
 # Test that the CRL works
@@ -340,11 +340,11 @@ $common_connstr =
 # Without the CRL, succeeds. With it, fails.
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca cert_database=ssl/nss/root+server_ca.crt.db",
 	"connects without client-side CRL");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/root+server.crl",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/server.crl cert_database=ssl/nss/root+server_ca.crt__server.crl.db",
 	qr/SSL error/,
 	"does not connect with client-side CRL");
 
@@ -365,21 +365,21 @@ command_like(
 # Test min/max SSL protocol versions.
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.2",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.2 cert_database=ssl/nss/root+server_ca.crt.db",
 	"connection success with correct range of TLS protocol versions");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.1",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.1 cert_database=ssl/nss/root+server_ca.crt.db",
 	qr/invalid SSL protocol version range/,
 	"connection failure with incorrect range of TLS protocol versions");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=incorrect_tls",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=incorrect_tls cert_database=ssl/nss/root+server_ca.crt.db",
 	qr/invalid ssl_min_protocol_version value/,
 	"connection failure with an incorrect SSL protocol minimum bound");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_max_protocol_version=incorrect_tls",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_max_protocol_version=incorrect_tls cert_database=ssl/nss/root+server_ca.crt.db",
 	qr/invalid ssl_max_protocol_version value/,
 	"connection failure with an incorrect SSL protocol maximum bound");
 
@@ -390,7 +390,7 @@ test_connect_fails(
 note "running server tests";
 
 $common_connstr =
-  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR";
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client.crt__client.key.db";
 
 # no client cert
 test_connect_fails(
@@ -406,32 +406,43 @@ test_connect_ok(
 	"certificate authorization succeeds with correct client cert in PEM format"
 );
 
-# correct client cert in unencrypted DER
-test_connect_ok(
-	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-der_tmp.key",
-	"certificate authorization succeeds with correct client cert in DER format"
-);
+$common_connstr =
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR";
+
+SKIP:
+{
+	skip "NSS database not implemented in the Makefile", 1 if ($nss);
+	# correct client cert in unencrypted DER
+	test_connect_ok(
+		$common_connstr,
+		"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-der_tmp.key",
+		"certificate authorization succeeds with correct client cert in DER format"
+	);
+}
 
 # correct client cert in encrypted PEM
 test_connect_ok(
 	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='dUmmyP^#+'",
+	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='dUmmyP^#+' cert_database=ssl/nss/client.crt__client-encrypted-pem.key.db",
 	"certificate authorization succeeds with correct client cert in encrypted PEM format"
 );
 
-# correct client cert in encrypted DER
-test_connect_ok(
-	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-der_tmp.key sslpassword='dUmmyP^#+'",
-	"certificate authorization succeeds with correct client cert in encrypted DER format"
-);
+SKIP:
+{
+	skip "NSS database not implemented in the Makefile", 1 if ($nss);
+	# correct client cert in encrypted DER
+	test_connect_ok(
+		$common_connstr,
+		"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-der_tmp.key sslpassword='dUmmyP^#+'",
+		"certificate authorization succeeds with correct client cert in encrypted DER format"
+	);
+}
 
 # correct client cert in encrypted PEM with wrong password
 test_connect_fails(
 	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='wrong'",
-	qr!\Qprivate key file "ssl/client-encrypted-pem_tmp.key": bad decrypt\E!,
+	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='wrong' cert_database=ssl/nss/client.crt__client-encrypted-pem.key.db",
+	qr!connection requires a valid client certificate|\Qprivate key file "ssl/client-encrypted-pem_tmp.key": bad decrypt\E!,
 	"certificate authorization fails with correct client cert and wrong password in encrypted PEM format"
 );
 
@@ -471,18 +482,19 @@ command_like(
 		'-P',
 		'null=_null_',
 		'-d',
-		"$common_connstr user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client_tmp.key",
+		"$common_connstr user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client_tmp.key cert_database=ssl/nss/client.crt__client.key.db",
 		'-c',
 		"SELECT * FROM pg_stat_ssl WHERE pid = pg_backend_pid()"
 	],
 	qr{^pid,ssl,version,cipher,bits,compression,client_dn,client_serial,issuer_dn\r?\n
-				^\d+,t,TLSv[\d.]+,[\w-]+,\d+,f,/CN=ssltestuser,1,\Q/CN=Test CA for PostgreSQL SSL regression test client certs\E\r?$}mx,
+				^\d+,t,TLSv[\d.]+,[\w-]+,\d+,f,/?CN=ssltestuser,1,/?\QCN=Test CA for PostgreSQL SSL regression test client certs\E\r?$}mx,
 	'pg_stat_ssl with client certificate');
 
 # client key with wrong permissions
 SKIP:
 {
 	skip "Permissions check not enforced on Windows", 2 if ($windows_os);
+	skip "Key not on filesystem with NSS",            2 if ($nss);
 
 	test_connect_fails(
 		$common_connstr,
@@ -495,10 +507,13 @@ SKIP:
 test_connect_fails(
 	$common_connstr,
 	"user=anotheruser sslcert=ssl/client.crt sslkey=ssl/client_tmp.key",
-	qr/certificate authentication failed for user "anotheruser"/,
+	qr/unable to verify certificate|certificate authentication failed for user "anotheruser"/,
 	"certificate authorization fails with client cert belonging to another user"
 );
 
+$common_connstr =
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client-revoked.crt__client-revoked.key.db";
+
 # revoked client cert
 test_connect_fails(
 	$common_connstr,
@@ -510,7 +525,7 @@ test_connect_fails(
 # works, iff username matches Common Name
 # fails, iff username doesn't match Common Name.
 $common_connstr =
-  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=verifydb hostaddr=$SERVERHOSTADDR";
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=verifydb hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client.crt__client.key.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -536,17 +551,18 @@ test_connect_ok(
 # intermediate client_ca.crt is provided by client, and isn't in server's ssl_ca_file
 switch_server_cert($node, 'server-cn-only', 'root_ca');
 $common_connstr =
-  "user=ssltestuser dbname=certdb sslkey=ssl/client_tmp.key sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR";
+  "user=ssltestuser dbname=certdb sslkey=ssl/client_tmp.key sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client+client_ca.crt__client.key.db";
 
 test_connect_ok(
 	$common_connstr,
 	"sslmode=require sslcert=ssl/client+client_ca.crt",
 	"intermediate client certificate is provided by client");
-test_connect_fails($common_connstr, "sslmode=require sslcert=ssl/client.crt",
-	qr/SSL error/, "intermediate client certificate is missing");
+test_connect_fails(
+	$common_connstr,
+	"sslmode=require sslcert=ssl/client.crt",
+	qr/connection requires a valid client certificate|SSL error/,
+	"intermediate client certificate is missing");
 
 # clean up
-foreach my $key (@keys)
-{
-	unlink("ssl/${key}_tmp.key");
-}
+
+SSL::Server::cleanup();
diff --git a/src/test/ssl/t/002_scram.pl b/src/test/ssl/t/002_scram.pl
index 01231f8ba0..4ea81fdbcf 100644
--- a/src/test/ssl/t/002_scram.pl
+++ b/src/test/ssl/t/002_scram.pl
@@ -11,11 +11,11 @@ use File::Copy;
 use FindBin;
 use lib $FindBin::RealBin;
 
-use SSLServer;
+use SSL::Server;
 
 if ($ENV{with_openssl} ne 'yes')
 {
-	plan skip_all => 'SSL not supported by this build';
+	plan skip_all => 'OpenSSL not supported by this build';
 }
 
 # This is the hostname used to connect to the server.
diff --git a/src/test/ssl/t/SSL/Backend/NSS.pm b/src/test/ssl/t/SSL/Backend/NSS.pm
new file mode 100644
index 0000000000..837f0d9891
--- /dev/null
+++ b/src/test/ssl/t/SSL/Backend/NSS.pm
@@ -0,0 +1,64 @@
+package SSL::Backend::NSS;
+
+use strict;
+use warnings;
+use Exporter;
+
+our @ISA       = qw(Exporter);
+our @EXPORT_OK = qw(get_new_nss_backend);
+
+sub new
+{
+	my ($class) = @_;
+
+	my $self = { _library => 'NSS' };
+
+	bless $self, $class;
+
+	return $self;
+}
+
+sub get_new_nss_backend
+{
+	my $class = 'SSL::Backend::NSS';
+
+	return $class->new();
+}
+
+sub init
+{
+	# Make sure the certificate databases are in place?
+}
+
+sub get_library
+{
+	my ($self) = @_;
+
+	return $self->{_library};
+}
+
+sub set_server_cert
+{
+	my $self     = $_[0];
+	my $certfile = $_[1];
+	my $cafile   = $_[2];
+	my $keyfile  = $_[3];
+
+	my $cert_nickname = $certfile . '.crt__' . $keyfile . '.key';
+	my $cert_database = $cert_nickname . '.db';
+
+	my $sslconf =
+	    "ssl_ca_file='$cafile.crt'\n"
+	  . "ssl_cert_file='ssl/$certfile.crt'\n"
+	  . "ssl_crl_file=''\n"
+	  . "ssl_database='nss/$cert_database'\n";
+
+	return $sslconf;
+}
+
+sub cleanup
+{
+	# Something?
+}
+
+1;
diff --git a/src/test/ssl/t/SSL/Backend/OpenSSL.pm b/src/test/ssl/t/SSL/Backend/OpenSSL.pm
new file mode 100644
index 0000000000..62b11b7632
--- /dev/null
+++ b/src/test/ssl/t/SSL/Backend/OpenSSL.pm
@@ -0,0 +1,103 @@
+package SSL::Backend::OpenSSL;
+
+use strict;
+use warnings;
+use Exporter;
+use File::Copy;
+
+our @ISA       = qw(Exporter);
+our @EXPORT_OK = qw(get_new_openssl_backend);
+
+our (@keys);
+
+INIT
+{
+	@keys = (
+		"client",     "client-revoked",
+		"client-der", "client-encrypted-pem",
+		"client-encrypted-der");
+}
+
+sub new
+{
+	my ($class) = @_;
+
+	my $self = { _library => 'OpenSSL' };
+
+	bless $self, $class;
+
+	return $self;
+}
+
+sub get_new_openssl_backend
+{
+	my $class = 'SSL::Backend::OpenSSL';
+
+	my $backend = $class->new();
+
+	return $backend;
+}
+
+sub init
+{
+	# The client's private key must not be world-readable, so take a copy
+	# of the key stored in the code tree and update its permissions.
+	#
+	# This changes ssl/client.key to ssl/client_tmp.key etc for the rest
+	# of the tests.
+	foreach my $key (@keys)
+	{
+		copy("ssl/${key}.key", "ssl/${key}_tmp.key")
+		  or die
+		  "couldn't copy ssl/${key}.key to ssl/${key}_tmp.key for permissions change: $!";
+		chmod 0600, "ssl/${key}_tmp.key"
+		  or die "failed to change permissions on ssl/${key}_tmp.key: $!";
+	}
+
+	# Also make a copy of that explicitly world-readable.  We can't
+	# necessarily rely on the file in the source tree having those
+	# permissions. Add it to @keys to include it in the final clean
+	# up phase.
+	copy("ssl/client.key", "ssl/client_wrongperms_tmp.key")
+	  or die
+	  "couldn't copy ssl/client.key to ssl/client_wrongperms_tmp.key: $!";
+	chmod 0644, "ssl/client_wrongperms_tmp.key"
+	  or die
+	  "failed to change permissions on ssl/client_wrongperms_tmp.key: $!";
+	push @keys, 'client_wrongperms';
+}
+
+# Change the configuration to use given server cert file, and reload
+# the server so that the configuration takes effect.
+sub set_server_cert
+{
+	my $self     = $_[0];
+	my $certfile = $_[1];
+	my $cafile   = $_[2] || "root+client_ca";
+	my $keyfile  = $_[3] || $certfile;
+
+	my $sslconf =
+	    "ssl_ca_file='$cafile.crt'\n"
+	  . "ssl_cert_file='$certfile.crt'\n"
+	  . "ssl_key_file='$keyfile.key'\n"
+	  . "ssl_crl_file='root+client.crl'\n";
+
+	return $sslconf;
+}
+
+sub get_library
+{
+	my ($self) = @_;
+
+	return $self->{_library};
+}
+
+sub cleanup
+{
+	foreach my $key (@keys)
+	{
+		unlink("ssl/${key}_tmp.key");
+	}
+}
+
+1;
diff --git a/src/test/ssl/t/SSLServer.pm b/src/test/ssl/t/SSL/Server.pm
similarity index 81%
rename from src/test/ssl/t/SSLServer.pm
rename to src/test/ssl/t/SSL/Server.pm
index 1e392b8fbf..f6b9711bcd 100644
--- a/src/test/ssl/t/SSLServer.pm
+++ b/src/test/ssl/t/SSL/Server.pm
@@ -24,15 +24,34 @@
 # explicitly because an invalid sslcert or sslrootcert, respectively,
 # causes those to be ignored.)
 
-package SSLServer;
+package SSL::Server;
 
 use strict;
 use warnings;
 use PostgresNode;
+use RecursiveCopy;
 use TestLib;
 use File::Basename;
 use File::Copy;
 use Test::More;
+use SSL::Backend::OpenSSL qw(get_new_openssl_backend);
+use SSL::Backend::NSS qw(get_new_nss_backend);
+
+our ($openssl, $nss, $backend);
+
+# The TLS backend which the server is using should be mostly transparent for
+# the user, apart from individual configuration settings, so keep the backend
+# specific things abstracted behind SSL::Server.
+if ($ENV{with_openssl} eq 'yes')
+{
+	$backend = get_new_openssl_backend();
+	$openssl = 1;
+}
+elsif ($ENV{with_nss} eq 'yes')
+{
+	$backend = get_new_nss_backend();
+	$nss     = 1;
+}
 
 use Exporter 'import';
 our @EXPORT = qw(
@@ -145,12 +164,19 @@ sub configure_test_server_for_ssl
 	close $sslconf;
 
 	# Copy all server certificates and keys, and client root cert, to the data dir
-	copy_files("ssl/server-*.crt", $pgdata);
-	copy_files("ssl/server-*.key", $pgdata);
-	chmod(0600, glob "$pgdata/server-*.key") or die $!;
-	copy_files("ssl/root+client_ca.crt", $pgdata);
-	copy_files("ssl/root_ca.crt",        $pgdata);
-	copy_files("ssl/root+client.crl",    $pgdata);
+	if (defined($openssl))
+	{
+		copy_files("ssl/server-*.crt", $pgdata);
+		copy_files("ssl/server-*.key", $pgdata);
+		chmod(0600, glob "$pgdata/server-*.key") or die $!;
+		copy_files("ssl/root+client_ca.crt", $pgdata);
+		copy_files("ssl/root_ca.crt",        $pgdata);
+		copy_files("ssl/root+client.crl",    $pgdata);
+	}
+	elsif (defined($nss))
+	{
+		RecursiveCopy::copypath("ssl/nss", $pgdata . "/nss") if -e "ssl/nss";
+	}
 
 	# Stop and restart server to load new listen_addresses.
 	$node->restart;
@@ -158,9 +184,22 @@ sub configure_test_server_for_ssl
 	# Change pg_hba after restart because hostssl requires ssl=on
 	configure_hba_for_ssl($node, $servercidr, $authmethod);
 
+	# Finally, perform backend specific configuration
+	$backend->init();
+
 	return;
 }
 
+sub ssl_library
+{
+	return $backend->get_library();
+}
+
+sub cleanup
+{
+	$backend->cleanup();
+}
+
 # Change the configuration to use given server cert file, and reload
 # the server so that the configuration takes effect.
 sub switch_server_cert
@@ -168,14 +207,17 @@ sub switch_server_cert
 	my $node     = $_[0];
 	my $certfile = $_[1];
 	my $cafile   = $_[2] || "root+client_ca";
+	my $keyfile  = $_[3] || '';
+	my $pwcmd    = $_[4] || '';
 	my $pgdata   = $node->data_dir;
 
+	$keyfile = $certfile if $keyfile eq '';
+
 	open my $sslconf, '>', "$pgdata/sslconfig.conf";
 	print $sslconf "ssl=on\n";
-	print $sslconf "ssl_ca_file='$cafile.crt'\n";
-	print $sslconf "ssl_cert_file='$certfile.crt'\n";
-	print $sslconf "ssl_key_file='$certfile.key'\n";
-	print $sslconf "ssl_crl_file='root+client.crl'\n";
+	print $sslconf $backend->set_server_cert($certfile, $cafile, $keyfile);
+	print $sslconf "ssl_passphrase_command='$pwcmd'\n"
+	  unless $pwcmd eq '';
 	close $sslconf;
 
 	$node->restart;
diff --git a/src/tools/msvc/Solution.pm b/src/tools/msvc/Solution.pm
index 023da62382..8856750856 100644
--- a/src/tools/msvc/Solution.pm
+++ b/src/tools/msvc/Solution.pm
@@ -484,6 +484,7 @@ sub GenerateFiles
 		USE_NAMED_POSIX_SEMAPHORES => undef,
 		USE_OPENSSL                => undef,
 		USE_OPENSSL_RANDOM         => undef,
+		USE_NSS                    => undef,
 		USE_PAM                    => undef,
 		USE_SLICING_BY_8_CRC32C    => undef,
 		USE_SSE42_CRC32C           => undef,
@@ -537,6 +538,10 @@ sub GenerateFiles
 			$define{HAVE_OPENSSL_INIT_SSL}      = 1;
 		}
 	}
+	if ($self->{options}->{nss})
+	{
+		$define{USE_NSS} = 1;
+	}
 
 	$self->GenerateConfigHeader('src/include/pg_config.h',     \%define, 1);
 	$self->GenerateConfigHeader('src/include/pg_config_ext.h', \%define, 0);
-- 
2.21.1 (Apple Git-122.3)

From 4da394fb8cb7d65f3bfe8fa244e347a1323d14e5 Mon Sep 17 00:00:00 2001
From: Andrew Dunstan <andrew.dunstan@2ndquadrant.com>
Date: Fri, 31 Jul 2020 19:40:26 +0000
Subject: [PATCH] WIP Support libnss as TLS backend v6

---
 configure                             |  211 +++++
 configure.ac                          |   30 +
 contrib/Makefile                      |    2 +-
 contrib/sslinfo/sslinfo.c             |  164 ++--
 doc/src/sgml/sslinfo.sgml             |   14 +-
 src/Makefile.global.in                |   10 +
 src/backend/libpq/Makefile            |    4 +
 src/backend/libpq/auth.c              |    7 +
 src/backend/libpq/be-secure-nss.c     | 1032 +++++++++++++++++++++++++
 src/backend/libpq/be-secure-openssl.c |   16 +-
 src/backend/libpq/be-secure.c         |    3 +
 src/backend/utils/misc/guc.c          |   20 +-
 src/include/common/pg_nss.h           |  141 ++++
 src/include/libpq/libpq-be.h          |    9 +-
 src/include/libpq/libpq.h             |    3 +
 src/include/pg_config.h.in            |    3 +
 src/include/pg_config_manual.h        |    5 +-
 src/interfaces/libpq/Makefile         |    4 +
 src/interfaces/libpq/fe-connect.c     |    4 +
 src/interfaces/libpq/fe-secure-nss.c  |  975 +++++++++++++++++++++++
 src/interfaces/libpq/fe-secure.c      |    5 +-
 src/interfaces/libpq/libpq-fe.h       |   11 +
 src/interfaces/libpq/libpq-int.h      |    5 +
 src/test/Makefile                     |    2 +-
 src/test/ssl/Makefile                 |  172 +++++
 src/test/ssl/t/001_ssltests.pl        |  278 +++----
 src/test/ssl/t/002_scram.pl           |    4 +-
 src/test/ssl/t/SSL/Backend/NSS.pm     |   64 ++
 src/test/ssl/t/SSL/Backend/OpenSSL.pm |  103 +++
 src/test/ssl/t/SSLServer.pm           |   64 +-
 src/tools/msvc/Install.pm             |    3 +-
 src/tools/msvc/Mkvcbuild.pm           |   29 +-
 src/tools/msvc/Solution.pm            |   20 +
 src/tools/msvc/config_default.pl      |    1 +
 34 files changed, 3168 insertions(+), 250 deletions(-)
 create mode 100644 src/backend/libpq/be-secure-nss.c
 create mode 100644 src/include/common/pg_nss.h
 create mode 100644 src/interfaces/libpq/fe-secure-nss.c
 create mode 100644 src/test/ssl/t/SSL/Backend/NSS.pm
 create mode 100644 src/test/ssl/t/SSL/Backend/OpenSSL.pm

diff --git a/configure b/configure
index cb8fbe1051..8b7d98c2ab 100755
--- a/configure
+++ b/configure
@@ -711,6 +711,7 @@ with_uuid
 with_readline
 with_systemd
 with_selinux
+with_nss
 with_openssl
 with_ldap
 with_krb_srvnam
@@ -856,6 +857,7 @@ with_bsd_auth
 with_ldap
 with_bonjour
 with_openssl
+with_nss
 with_selinux
 with_systemd
 with_readline
@@ -1558,6 +1560,7 @@ Optional Packages:
   --with-ldap             build with LDAP support
   --with-bonjour          build with Bonjour support
   --with-openssl          build with OpenSSL support
+  --with-nss              build with NSS support
   --with-selinux          build with SELinux support
   --with-systemd          build with systemd support
   --without-readline      do not use GNU Readline nor BSD Libedit for editing
@@ -8100,6 +8103,41 @@ fi
 $as_echo "$with_openssl" >&6; }
 
 
+#
+# LibNSS
+#
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether to build with NSS support" >&5
+$as_echo_n "checking whether to build with NSS support... " >&6; }
+
+
+
+# Check whether --with-nss was given.
+if test "${with_nss+set}" = set; then :
+  withval=$with_nss;
+  case $withval in
+    yes)
+
+$as_echo "#define USE_NSS 1" >>confdefs.h
+
+      ;;
+    no)
+      :
+      ;;
+    *)
+      as_fn_error $? "no argument expected for --with-nss option" "$LINENO" 5
+      ;;
+  esac
+
+else
+  with_nss=no
+
+fi
+
+
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $with_nss" >&5
+$as_echo "$with_nss" >&6; }
+
+
 #
 # SELinux
 #
@@ -12174,6 +12212,9 @@ fi
 fi
 
 if test "$with_openssl" = yes ; then
+  if test x"$with_nss" = x"yes" ; then
+    as_fn_error $? "multiple SSL backends cannot be enabled simultaneously\"" "$LINENO" 5
+  fi
     # Minimum required OpenSSL version is 1.0.1
 
 $as_echo "#define OPENSSL_API_COMPAT 0x10001000L" >>confdefs.h
@@ -12436,6 +12477,157 @@ done
 
 fi
 
+if test "$with_nss" = yes ; then
+  if test x"$with_openssl" = x"yes" ; then
+    as_fn_error $? "multiple SSL backends cannot be enabled simultaneously\"" "$LINENO" 5
+  fi
+  CLEANLDFLAGS="$LDFLAGS"
+  # TODO: document this set of LDFLAGS
+  LDFLAGS="-lssl3 -lsmime3 -lnss3 -lplds4 -lplc4 -lnspr4 $LDFLAGS"
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for SSL_VersionRangeSet in -lnss3" >&5
+$as_echo_n "checking for SSL_VersionRangeSet in -lnss3... " >&6; }
+if ${ac_cv_lib_nss3_SSL_VersionRangeSet+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lnss3  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char SSL_VersionRangeSet ();
+int
+main ()
+{
+return SSL_VersionRangeSet ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_lib_nss3_SSL_VersionRangeSet=yes
+else
+  ac_cv_lib_nss3_SSL_VersionRangeSet=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_nss3_SSL_VersionRangeSet" >&5
+$as_echo "$ac_cv_lib_nss3_SSL_VersionRangeSet" >&6; }
+if test "x$ac_cv_lib_nss3_SSL_VersionRangeSet" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_LIBNSS3 1
+_ACEOF
+
+  LIBS="-lnss3 $LIBS"
+
+else
+  as_fn_error $? "library 'nss3' is required for NSS" "$LINENO" 5
+fi
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for PR_GetDefaultIOMethods in -lnspr4" >&5
+$as_echo_n "checking for PR_GetDefaultIOMethods in -lnspr4... " >&6; }
+if ${ac_cv_lib_nspr4_PR_GetDefaultIOMethods+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lnspr4  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char PR_GetDefaultIOMethods ();
+int
+main ()
+{
+return PR_GetDefaultIOMethods ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_lib_nspr4_PR_GetDefaultIOMethods=yes
+else
+  ac_cv_lib_nspr4_PR_GetDefaultIOMethods=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_nspr4_PR_GetDefaultIOMethods" >&5
+$as_echo "$ac_cv_lib_nspr4_PR_GetDefaultIOMethods" >&6; }
+if test "x$ac_cv_lib_nspr4_PR_GetDefaultIOMethods" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_LIBNSPR4 1
+_ACEOF
+
+  LIBS="-lnspr4 $LIBS"
+
+else
+  as_fn_error $? "library 'nspr4' is required for NSS" "$LINENO" 5
+fi
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for SSL_GetImplementedCiphers in -lssl3" >&5
+$as_echo_n "checking for SSL_GetImplementedCiphers in -lssl3... " >&6; }
+if ${ac_cv_lib_ssl3_SSL_GetImplementedCiphers+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lssl3  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char SSL_GetImplementedCiphers ();
+int
+main ()
+{
+return SSL_GetImplementedCiphers ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_lib_ssl3_SSL_GetImplementedCiphers=yes
+else
+  ac_cv_lib_ssl3_SSL_GetImplementedCiphers=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_ssl3_SSL_GetImplementedCiphers" >&5
+$as_echo "$ac_cv_lib_ssl3_SSL_GetImplementedCiphers" >&6; }
+if test "x$ac_cv_lib_ssl3_SSL_GetImplementedCiphers" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_LIBSSL3 1
+_ACEOF
+
+  LIBS="-lssl3 $LIBS"
+
+else
+  as_fn_error $? "library 'ssl3' is required for NSS" "$LINENO" 5
+fi
+
+  LDFLAGS="$CLEANLDFLAGS"
+fi
+
 if test "$with_pam" = yes ; then
   { $as_echo "$as_me:${as_lineno-$LINENO}: checking for pam_start in -lpam" >&5
 $as_echo_n "checking for pam_start in -lpam... " >&6; }
@@ -13338,6 +13530,25 @@ else
 fi
 
 
+fi
+
+if test "$with_nss" = yes ; then
+  ac_fn_c_check_header_mongrel "$LINENO" "ssl.h" "ac_cv_header_ssl_h" "$ac_includes_default"
+if test "x$ac_cv_header_ssl_h" = xyes; then :
+
+else
+  as_fn_error $? "header file <ssl.h> is required for NSS" "$LINENO" 5
+fi
+
+
+  ac_fn_c_check_header_mongrel "$LINENO" "nss.h" "ac_cv_header_nss_h" "$ac_includes_default"
+if test "x$ac_cv_header_nss_h" = xyes; then :
+
+else
+  as_fn_error $? "header file <nss.h> is required for NSS" "$LINENO" 5
+fi
+
+
 fi
 
 if test "$with_pam" = yes ; then
diff --git a/configure.ac b/configure.ac
index eb2c731b58..23c07cabce 100644
--- a/configure.ac
+++ b/configure.ac
@@ -856,6 +856,15 @@ PGAC_ARG_BOOL(with, openssl, no, [build with OpenSSL support],
 AC_MSG_RESULT([$with_openssl])
 AC_SUBST(with_openssl)
 
+#
+# LibNSS
+#
+AC_MSG_CHECKING([whether to build with NSS support])
+PGAC_ARG_BOOL(with, nss, no, [build with NSS support],
+              [AC_DEFINE([USE_NSS], 1, [Define to build with NSS support. (--with-nss)])])
+AC_MSG_RESULT([$with_nss])
+AC_SUBST(with_nss)
+
 #
 # SELinux
 #
@@ -1205,6 +1214,9 @@ if test "$with_gssapi" = yes ; then
 fi
 
 if test "$with_openssl" = yes ; then
+  if test x"$with_nss" = x"yes" ; then
+    AC_MSG_ERROR([multiple SSL backends cannot be enabled simultaneously"])
+  fi
   dnl Order matters!
   # Minimum required OpenSSL version is 1.0.1
   AC_DEFINE(OPENSSL_API_COMPAT, [0x10001000L],
@@ -1230,6 +1242,19 @@ if test "$with_openssl" = yes ; then
   AC_CHECK_FUNCS([CRYPTO_lock])
 fi
 
+if test "$with_nss" = yes ; then
+  if test x"$with_openssl" = x"yes" ; then
+    AC_MSG_ERROR([multiple SSL backends cannot be enabled simultaneously"])
+  fi
+  CLEANLDFLAGS="$LDFLAGS"
+  # TODO: document this set of LDFLAGS
+  LDFLAGS="-lssl3 -lsmime3 -lnss3 -lplds4 -lplc4 -lnspr4 $LDFLAGS"
+  AC_CHECK_LIB(nss3, SSL_VersionRangeSet, [], [AC_MSG_ERROR([library 'nss3' is required for NSS])])
+  AC_CHECK_LIB(nspr4, PR_GetDefaultIOMethods, [], [AC_MSG_ERROR([library 'nspr4' is required for NSS])])
+  AC_CHECK_LIB(ssl3, SSL_GetImplementedCiphers, [], [AC_MSG_ERROR([library 'ssl3' is required for NSS])])
+  LDFLAGS="$CLEANLDFLAGS"
+fi
+
 if test "$with_pam" = yes ; then
   AC_CHECK_LIB(pam,    pam_start, [], [AC_MSG_ERROR([library 'pam' is required for PAM])])
 fi
@@ -1405,6 +1430,11 @@ if test "$with_openssl" = yes ; then
   AC_CHECK_HEADER(openssl/err.h, [], [AC_MSG_ERROR([header file <openssl/err.h> is required for OpenSSL])])
 fi
 
+if test "$with_nss" = yes ; then
+  AC_CHECK_HEADER(ssl.h, [], [AC_MSG_ERROR([header file <ssl.h> is required for NSS])])
+  AC_CHECK_HEADER(nss.h, [], [AC_MSG_ERROR([header file <nss.h> is required for NSS])])
+fi
+
 if test "$with_pam" = yes ; then
   AC_CHECK_HEADERS(security/pam_appl.h, [],
                    [AC_CHECK_HEADERS(pam/pam_appl.h, [],
diff --git a/contrib/Makefile b/contrib/Makefile
index 1846d415b6..cef7bf7f61 100644
--- a/contrib/Makefile
+++ b/contrib/Makefile
@@ -50,7 +50,7 @@ SUBDIRS = \
 		unaccent	\
 		vacuumlo
 
-ifeq ($(with_openssl),yes)
+ifeq ($(with_ssl),yes)
 SUBDIRS += sslinfo
 else
 ALWAYS_SUBDIRS += sslinfo
diff --git a/contrib/sslinfo/sslinfo.c b/contrib/sslinfo/sslinfo.c
index 5ba3988e27..84bb2c65b8 100644
--- a/contrib/sslinfo/sslinfo.c
+++ b/contrib/sslinfo/sslinfo.c
@@ -9,9 +9,11 @@
 
 #include "postgres.h"
 
+#ifdef USE_OPENSSL
 #include <openssl/x509.h>
 #include <openssl/x509v3.h>
 #include <openssl/asn1.h>
+#endif
 
 #include "access/htup_details.h"
 #include "funcapi.h"
@@ -21,8 +23,8 @@
 
 PG_MODULE_MAGIC;
 
+#ifdef USE_OPENSSL
 static Datum X509_NAME_field_to_text(X509_NAME *name, text *fieldName);
-static Datum X509_NAME_to_text(X509_NAME *name);
 static Datum ASN1_STRING_to_text(ASN1_STRING *str);
 
 /*
@@ -32,6 +34,7 @@ typedef struct
 {
 	TupleDesc	tupdesc;
 } SSLExtensionInfoContext;
+#endif
 
 /*
  * Indicates whether current session uses SSL
@@ -54,9 +57,16 @@ PG_FUNCTION_INFO_V1(ssl_version);
 Datum
 ssl_version(PG_FUNCTION_ARGS)
 {
-	if (MyProcPort->ssl == NULL)
+	const char *version;
+
+	if (!MyProcPort->ssl_in_use)
+		PG_RETURN_NULL();
+
+	version = be_tls_get_version(MyProcPort);
+	if (version == NULL)
 		PG_RETURN_NULL();
-	PG_RETURN_TEXT_P(cstring_to_text(SSL_get_version(MyProcPort->ssl)));
+
+	PG_RETURN_TEXT_P(cstring_to_text(version));
 }
 
 
@@ -67,9 +77,16 @@ PG_FUNCTION_INFO_V1(ssl_cipher);
 Datum
 ssl_cipher(PG_FUNCTION_ARGS)
 {
-	if (MyProcPort->ssl == NULL)
+	const char *cipher;
+
+	if (!MyProcPort->ssl_in_use)
 		PG_RETURN_NULL();
-	PG_RETURN_TEXT_P(cstring_to_text(SSL_get_cipher(MyProcPort->ssl)));
+
+	cipher = be_tls_get_cipher(MyProcPort);
+	if (cipher == NULL)
+		PG_RETURN_NULL();
+
+	PG_RETURN_TEXT_P(cstring_to_text(cipher));
 }
 
 
@@ -83,7 +100,7 @@ PG_FUNCTION_INFO_V1(ssl_client_cert_present);
 Datum
 ssl_client_cert_present(PG_FUNCTION_ARGS)
 {
-	PG_RETURN_BOOL(MyProcPort->peer != NULL);
+	PG_RETURN_BOOL(MyProcPort->peer_cert_valid);
 }
 
 
@@ -99,29 +116,26 @@ PG_FUNCTION_INFO_V1(ssl_client_serial);
 Datum
 ssl_client_serial(PG_FUNCTION_ARGS)
 {
+	char decimal[NAMEDATALEN];
 	Datum		result;
-	Port	   *port = MyProcPort;
-	X509	   *peer = port->peer;
-	ASN1_INTEGER *serial = NULL;
-	BIGNUM	   *b;
-	char	   *decimal;
 
-	if (!peer)
+	if (!MyProcPort->ssl_in_use || !MyProcPort->peer_cert_valid)
+		PG_RETURN_NULL();
+
+	be_tls_get_peer_serial(MyProcPort, decimal, NAMEDATALEN);
+
+	if (!*decimal)
 		PG_RETURN_NULL();
-	serial = X509_get_serialNumber(peer);
-	b = ASN1_INTEGER_to_BN(serial, NULL);
-	decimal = BN_bn2dec(b);
 
-	BN_free(b);
 	result = DirectFunctionCall3(numeric_in,
 								 CStringGetDatum(decimal),
 								 ObjectIdGetDatum(0),
 								 Int32GetDatum(-1));
-	OPENSSL_free(decimal);
 	return result;
 }
 
 
+#ifdef USE_OPENSSL
 /*
  * Converts OpenSSL ASN1_STRING structure into text
  *
@@ -228,7 +242,7 @@ ssl_client_dn_field(PG_FUNCTION_ARGS)
 	text	   *fieldname = PG_GETARG_TEXT_PP(0);
 	Datum		result;
 
-	if (!(MyProcPort->peer))
+	if (!MyProcPort->ssl_in_use || !MyProcPort->peer_cert_valid)
 		PG_RETURN_NULL();
 
 	result = X509_NAME_field_to_text(X509_get_subject_name(MyProcPort->peer), fieldname);
@@ -273,76 +287,23 @@ ssl_issuer_field(PG_FUNCTION_ARGS)
 	else
 		return result;
 }
+#endif							/* USE_OPENSSL */
 
-
-/*
- * Equivalent of X509_NAME_oneline that respects encoding
- *
- * This function converts X509_NAME structure to the text variable
- * converting all textual data into current database encoding.
- *
- * Parameter: X509_NAME *name X509_NAME structure to be converted
- *
- * Returns: text datum which contains string representation of
- * X509_NAME
- */
-static Datum
-X509_NAME_to_text(X509_NAME *name)
+#ifdef USE_NSS
+PG_FUNCTION_INFO_V1(ssl_client_dn_field);
+Datum
+ssl_client_dn_field(PG_FUNCTION_ARGS)
 {
-	BIO		   *membuf = BIO_new(BIO_s_mem());
-	int			i,
-				nid,
-				count = X509_NAME_entry_count(name);
-	X509_NAME_ENTRY *e;
-	ASN1_STRING *v;
-	const char *field_name;
-	size_t		size;
-	char		nullterm;
-	char	   *sp;
-	char	   *dp;
-	text	   *result;
-
-	if (membuf == NULL)
-		ereport(ERROR,
-				(errcode(ERRCODE_OUT_OF_MEMORY),
-				 errmsg("could not create OpenSSL BIO structure")));
-
-	(void) BIO_set_close(membuf, BIO_CLOSE);
-	for (i = 0; i < count; i++)
-	{
-		e = X509_NAME_get_entry(name, i);
-		nid = OBJ_obj2nid(X509_NAME_ENTRY_get_object(e));
-		if (nid == NID_undef)
-			ereport(ERROR,
-					(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
-					 errmsg("could not get NID for ASN1_OBJECT object")));
-		v = X509_NAME_ENTRY_get_data(e);
-		field_name = OBJ_nid2sn(nid);
-		if (field_name == NULL)
-			field_name = OBJ_nid2ln(nid);
-		if (field_name == NULL)
-			ereport(ERROR,
-					(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
-					 errmsg("could not convert NID %d to an ASN1_OBJECT structure", nid)));
-		BIO_printf(membuf, "/%s=", field_name);
-		ASN1_STRING_print_ex(membuf, v,
-							 ((ASN1_STRFLGS_RFC2253 & ~ASN1_STRFLGS_ESC_MSB)
-							  | ASN1_STRFLGS_UTF8_CONVERT));
-	}
-
-	/* ensure null termination of the BIO's content */
-	nullterm = '\0';
-	BIO_write(membuf, &nullterm, 1);
-	size = BIO_get_mem_data(membuf, &sp);
-	dp = pg_any_to_server(sp, size - 1, PG_UTF8);
-	result = cstring_to_text(dp);
-	if (dp != sp)
-		pfree(dp);
-	if (BIO_free(membuf) != 1)
-		elog(ERROR, "could not free OpenSSL BIO structure");
+	PG_RETURN_NULL();
+}
 
-	PG_RETURN_TEXT_P(result);
+PG_FUNCTION_INFO_V1(ssl_issuer_field);
+Datum
+ssl_issuer_field(PG_FUNCTION_ARGS)
+{
+	PG_RETURN_NULL();
 }
+#endif							/* USE_NSS */
 
 
 /*
@@ -358,9 +319,17 @@ PG_FUNCTION_INFO_V1(ssl_client_dn);
 Datum
 ssl_client_dn(PG_FUNCTION_ARGS)
 {
-	if (!(MyProcPort->peer))
+	char		subject[NAMEDATALEN];
+
+	if (!MyProcPort->ssl_in_use || !MyProcPort->peer_cert_valid)
+		PG_RETURN_NULL();
+
+	be_tls_get_peer_subject_name(MyProcPort, subject, NAMEDATALEN);
+
+	if (!*subject)
 		PG_RETURN_NULL();
-	return X509_NAME_to_text(X509_get_subject_name(MyProcPort->peer));
+
+	PG_RETURN_TEXT_P(cstring_to_text(subject));
 }
 
 
@@ -377,12 +346,21 @@ PG_FUNCTION_INFO_V1(ssl_issuer_dn);
 Datum
 ssl_issuer_dn(PG_FUNCTION_ARGS)
 {
-	if (!(MyProcPort->peer))
+	char		issuer[NAMEDATALEN];
+
+	if (!MyProcPort->ssl_in_use || !MyProcPort->peer_cert_valid)
+		PG_RETURN_NULL();
+
+	be_tls_get_peer_issuer_name(MyProcPort, issuer, NAMEDATALEN);
+
+	if (!*issuer)
 		PG_RETURN_NULL();
-	return X509_NAME_to_text(X509_get_issuer_name(MyProcPort->peer));
+
+	PG_RETURN_TEXT_P(cstring_to_text(issuer));
 }
 
 
+#ifdef USE_OPENSSL
 /*
  * Returns information about available SSL extensions.
  *
@@ -516,3 +494,13 @@ ssl_extension_info(PG_FUNCTION_ARGS)
 	/* All done */
 	SRF_RETURN_DONE(funcctx);
 }
+#endif							/* USE_OPENSSL */
+
+#ifdef USE_NSS
+PG_FUNCTION_INFO_V1(ssl_extension_info);
+Datum
+ssl_extension_info(PG_FUNCTION_ARGS)
+{
+	PG_RETURN_NULL();
+}
+#endif							/* USE_NSS */
diff --git a/doc/src/sgml/sslinfo.sgml b/doc/src/sgml/sslinfo.sgml
index c237d4ba95..d15a206d2d 100644
--- a/doc/src/sgml/sslinfo.sgml
+++ b/doc/src/sgml/sslinfo.sgml
@@ -22,7 +22,8 @@
 
  <para>
   This extension won't build at all unless the installation was
-  configured with <literal>--with-openssl</literal>.
+  configured with SSL support, such as <literal>--with-openssl</literal>
+  or <literal>--with-nss</literal>.
  </para>
 
  <sect2>
@@ -54,7 +55,7 @@
     <listitem>
     <para>
      Returns the name of the protocol used for the SSL connection (e.g. TLSv1.0
-     TLSv1.1, or TLSv1.2).
+     TLSv1.1, TLSv1.2 or TLSv1.3).
     </para>
     </listitem>
    </varlistentry>
@@ -208,6 +209,9 @@ emailAddress
      the X.500 and X.509 standards, so you cannot just assign arbitrary
      meaning to them.
     </para>
+    <para>
+     This function is only available when using OpenSSL.
+    </para>
     </listitem>
    </varlistentry>
 
@@ -223,6 +227,9 @@ emailAddress
      Same as <function>ssl_client_dn_field</function>, but for the certificate issuer
      rather than the certificate subject.
     </para>
+    <para>
+     This function is only available when using OpenSSL.
+    </para>
     </listitem>
    </varlistentry>
 
@@ -238,6 +245,9 @@ emailAddress
      Provide information about extensions of client certificate: extension name,
      extension value, and if it is a critical extension.
     </para>
+    <para>
+     This function is only available when using OpenSSL.
+    </para>
     </listitem>
    </varlistentry>
   </variablelist>
diff --git a/src/Makefile.global.in b/src/Makefile.global.in
index 9a6265b3a0..2f25c51c6c 100644
--- a/src/Makefile.global.in
+++ b/src/Makefile.global.in
@@ -184,6 +184,7 @@ with_perl	= @with_perl@
 with_python	= @with_python@
 with_tcl	= @with_tcl@
 with_openssl	= @with_openssl@
+with_nss        = @with_nss@
 with_readline	= @with_readline@
 with_selinux	= @with_selinux@
 with_systemd	= @with_systemd@
@@ -232,6 +233,15 @@ CLANG = @CLANG@
 BITCODE_CFLAGS = @BITCODE_CFLAGS@
 BITCODE_CXXFLAGS = @BITCODE_CXXFLAGS@
 
+ifeq ($(with_openssl),yes)
+with_ssl = yes
+else ifeq ($(with_nss),yes)
+with_ssl = yes
+else
+with_ssl = no
+endif
+
+
 ##########################################################################
 #
 # Programs and flags
diff --git a/src/backend/libpq/Makefile b/src/backend/libpq/Makefile
index efc5ef760a..191266a426 100644
--- a/src/backend/libpq/Makefile
+++ b/src/backend/libpq/Makefile
@@ -30,6 +30,10 @@ OBJS = \
 
 ifeq ($(with_openssl),yes)
 OBJS += be-secure-openssl.o
+else
+ifeq ($(with_nss),yes)
+OBJS += be-secure-nss.o
+endif
 endif
 
 ifeq ($(with_gssapi),yes)
diff --git a/src/backend/libpq/auth.c b/src/backend/libpq/auth.c
index 02b6c3f127..8f4197d002 100644
--- a/src/backend/libpq/auth.c
+++ b/src/backend/libpq/auth.c
@@ -2870,7 +2870,14 @@ CheckCertAuth(Port *port)
 {
 	int			status_check_usermap = STATUS_ERROR;
 
+#if defined(USE_OPENSSL)
 	Assert(port->ssl);
+#elif defined(USE_NSS)
+	/* TODO: should we rename pr_fd to ssl, to keep consistency? */
+	Assert(port->pr_fd);
+#else
+	Assert(false);
+#endif
 
 	/* Make sure we have received a username in the certificate */
 	if (port->peer_cn == NULL ||
diff --git a/src/backend/libpq/be-secure-nss.c b/src/backend/libpq/be-secure-nss.c
new file mode 100644
index 0000000000..00ae054920
--- /dev/null
+++ b/src/backend/libpq/be-secure-nss.c
@@ -0,0 +1,1032 @@
+/*-------------------------------------------------------------------------
+ *
+ * be-secure-nss.c
+ *	  functions for supporting NSS as a TLS backend
+ *
+ *
+ * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ *	  src/backend/libpq/be-secure-nss.c
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#include "postgres.h"
+
+#include <sys/stat.h>
+
+/*
+ * BITS_PER_BYTE is also defined in the NSPR header fils, so we need to undef
+ * our version to avoid compiler warnings on redefinition.
+ */
+#define pg_BITS_PER_BYTE BITS_PER_BYTE
+#undef BITS_PER_BYTE
+
+/*
+ * The nspr/obsolete/protypes.h NSPR header typedefs uint64 and int64 with
+ * colliding definitions from ours, causing a much expected compiler error.
+ * The definitions are however not actually used in NSPR at all, and are only
+ * intended for what seems to be backwards compatibility for apps written
+ * against old versions of NSPR.  The following comment is in the referenced
+ * file, and was added in 1998:
+ *
+ *		This section typedefs the old 'native' types to the new PR<type>s.
+ *		These definitions are scheduled to be eliminated at the earliest
+ *		possible time. The NSPR API is implemented and documented using
+ *		the new definitions.
+ *
+ * As there is no opt-out from pulling in these typedefs, we define the guard
+ * for the file to exclude it. This is incredibly ugly, but seems to be about
+ * the only way around it.
+ */
+#define PROTYPES_H
+#include <nspr.h>
+#undef PROTYPES_H
+#include <nss.h>
+#include <prio.h>
+#include <ssl.h>
+#include <sslerr.h>
+#include <secerr.h>
+#include <sslproto.h>
+#include <prtypes.h>
+#include <pk11pub.h>
+#include <secitem.h>
+#include <secport.h>
+#include <secder.h>
+#include <certdb.h>
+#include <base64.h>
+#include <cert.h>
+#include <prerror.h>
+#include <keyhi.h>
+
+typedef struct
+{
+	enum
+	{
+		PW_NONE = 0,
+		PW_FROMFILE = 1,
+		PW_PLAINTEXT = 2,
+		PW_EXTERNAL = 3
+	} source;
+	char	   *data;
+}			secuPWData;
+
+/*
+ * Ensure that the colliding definitions match, else throw an error. In case
+ * NSPR has removed the definition for some reasone, make sure to put ours
+ * back again.
+ */
+#if defined(BITS_PER_BYTE)
+#if BITS_PER_BYTE != pg_BITS_PER_BYTE
+#error "incompatible byte widths between NSPR and postgres"
+#endif
+#else
+#define BITS_PER_BYTE pg_BITS_PER_BYTE
+#endif
+#undef pg_BITS_PER_BYTE
+
+#include "common/pg_nss.h"
+#include "lib/stringinfo.h"
+#include "libpq/libpq.h"
+#include "nodes/pg_list.h"
+#include "miscadmin.h"
+#include "storage/fd.h"
+#include "utils/guc.h"
+#include "utils/memutils.h"
+
+static PRDescIdentity pr_id;
+
+static PRIOMethods pr_iomethods;
+static NSSInitContext * nss_context = NULL;
+static SSLVersionRange desired_sslver;
+
+/*
+ * PR_ImportTCPSocket() is a private API, but very widely used, as it's the
+ * only way to make NSS use an already set up POSIX file descriptor rather
+ * than opening one itself. To quote the NSS documentation:
+ *
+ *		"In theory, code that uses PR_ImportTCPSocket may break when NSPR's
+ *		implementation changes. In practice, this is unlikely to happen because
+ *		NSPR's implementation has been stable for years and because of NSPR's
+ *		strong commitment to backward compatibility."
+ *
+ * https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSPR/Reference/PR_ImportTCPSocket
+ *
+ * The function is declared in <private/pprio.h>, but as it is a header marked
+ * private we declare it here rather than including it.
+ */
+NSPR_API(PRFileDesc *) PR_ImportTCPSocket(int);
+
+/* NSS IO layer callback overrides */
+static PRInt32 pg_ssl_read(PRFileDesc * fd, void *buf, PRInt32 amount,
+						   PRIntn flags, PRIntervalTime timeout);
+static PRInt32 pg_ssl_write(PRFileDesc * fd, const void *buf, PRInt32 amount,
+							PRIntn flags, PRIntervalTime timeout);
+/* Utility functions */
+static PRFileDesc * init_iolayer(Port *port, int loglevel);
+static uint16 ssl_protocol_version_to_nss(int v, const char *guc_name);
+
+static char *pg_SSLerrmessage(PRErrorCode errcode);
+static char *ssl_protocol_version_to_string(int v);
+static SECStatus pg_cert_auth_handler(void *arg, PRFileDesc * fd,
+									  PRBool checksig, PRBool isServer);
+static SECStatus pg_bad_cert_handler(void *arg, PRFileDesc * fd);
+
+/* ------------------------------------------------------------ */
+/*						 Public interface						*/
+/* ------------------------------------------------------------ */
+
+static char *
+ssl_passphrase_callback(PK11SlotInfo * slot, PRBool retry, void *arg)
+{
+	return pstrdup("");
+}
+
+/*
+ * be_tls_init
+ *			Initialize the nss TLS library in the postmaster
+ *
+ * The majority of the setup needs to happen in be_tls_open_server since the
+ * NSPR initialization must happen after the forking of the backend. We could
+ * potentially move some parts in under !isServerStart, but so far this is the
+ * separation chosen.
+ */
+int
+be_tls_init(bool isServerStart)
+{
+	SECStatus	status;
+	SSLVersionRange supported_sslver;
+
+	/*
+	 * Set up the connection cache for multi-processing application behavior.
+	 * If we are in ServerStart then we initialize the cache. If the server is
+	 * already started, we inherit the cache such that it can be used for
+	 * connections. Calling SSL_ConfigMPServerSIDCache sets an environment
+	 * variable which contains enough information for the forked child to know
+	 * how to access it.  Passing NULL to SSL_InheritMPServerSIDCache will
+	 * make the forked child look it up by the default name SSL_INHERITANCE,
+	 * if env vars aren't inherited then the contents of the variable can be
+	 * passed instead.
+	 */
+	if (isServerStart)
+	{
+		/*
+		 * SSLv2 and SSLv3 are disabled in this TLS backend, but when setting
+		 * up the required session cache for NSS we still must supply timeout
+		 * values for v2 and The minimum allowed value for both is 5 seconds,
+		 * so opt for that in both cases (the defaults being 100 seconds and
+		 * 24 hours).
+		 *
+		 * Passing NULL as the directory for the session cache will default to
+		 * using /tmp on UNIX and \\temp on Windows.  Deciding if we want to
+		 * keep closer control on this directory is left as a TODO.
+		 */
+		status = SSL_ConfigMPServerSIDCache(MaxConnections, 5, 5, NULL);
+		if (status != SECSuccess)
+			ereport(FATAL,
+					(errmsg("unable to set up TLS connection cache: %s",
+							pg_SSLerrmessage(PR_GetError()))));
+
+	}
+	else
+	{
+		status = SSL_InheritMPServerSIDCache(NULL);
+		if (status != SECSuccess)
+		{
+			ereport(LOG,
+					(errmsg("unable to connect to TLS connection cache: %s",
+							pg_SSLerrmessage(PR_GetError()))));
+			return -1;
+		}
+	}
+
+	if (!ssl_database || strlen(ssl_database) == 0)
+	{
+		ereport(isServerStart ? FATAL : LOG,
+				(errmsg("no certificate database specified")));
+		goto error;
+	}
+
+	/*
+	 * We check for the desired TLS version range here, even though we cannot
+	 * set it until be_open_server such that we can be compatible with how the
+	 * OpenSSL backend reports errors for incompatible range configurations.
+	 * Set either the default supported TLS version range, or the configured
+	 * range from ssl_min_protocol_version and ssl_max_protocol version. In
+	 * case the user hasn't defined the maximum allowed version we fall back
+	 * to the highest version TLS that the library supports.
+	 */
+	if (SSL_VersionRangeGetSupported(ssl_variant_stream, &supported_sslver) != SECSuccess)
+	{
+		ereport(isServerStart ? FATAL : LOG,
+				(errmsg("unable to get default protocol support from NSS")));
+		goto error;
+	}
+
+	/*
+	 * Set the fallback versions for the TLS protocol version range to a
+	 * combination of our minimal requirement and the library maximum.
+	 */
+	desired_sslver.min = SSL_LIBRARY_VERSION_TLS_1_0;
+	desired_sslver.max = supported_sslver.max;
+
+	if (ssl_min_protocol_version)
+	{
+		int			ver = ssl_protocol_version_to_nss(ssl_min_protocol_version,
+													  "ssl_min_protocol_version");
+
+		if (ver == -1)
+		{
+			ereport(isServerStart ? FATAL : LOG,
+					(errmsg("\"%s\" setting \"%s\" not supported by this build",
+							"ssl_min_protocol_version",
+							GetConfigOption("ssl_min_protocol_version",
+											false, false))));
+			goto error;
+		}
+
+		if (ver > 0)
+			desired_sslver.min = ver;
+	}
+
+	if (ssl_max_protocol_version)
+	{
+		int			ver = ssl_protocol_version_to_nss(ssl_max_protocol_version,
+													  "ssl_max_protocol_version");
+
+		if (ver == -1)
+		{
+			ereport(isServerStart ? FATAL : LOG,
+					(errmsg("\"%s\" setting \"%s\" not supported by this build",
+							"ssl_max_protocol_version",
+							GetConfigOption("ssl_max_protocol_version",
+											false, false))));
+			goto error;
+		}
+		if (ver > 0)
+			desired_sslver.max = ver;
+
+		if (ver < desired_sslver.min)
+		{
+			ereport(isServerStart ? FATAL : LOG,
+					(errmsg("could not set SSL protocol version range"),
+					 errdetail("\"%s\" cannot be higher than \"%s\"",
+							   "ssl_min_protocol_version",
+							   "ssl_max_protocol_version")));
+			goto error;
+		}
+	}
+
+	return 0;
+error:
+	return -1;
+}
+
+int
+be_tls_open_server(Port *port)
+{
+	SECStatus	status;
+	PRFileDesc *model;
+	PRFileDesc *pr_fd;
+	PRFileDesc *layer;
+	CERTCertificate *server_cert;
+	SECKEYPrivateKey *private_key;
+	CERTSignedCrl *crl;
+	SECItem		crlname;
+	secuPWData	pwdata = {PW_NONE, 0};	/* TODO: This is a bogus callback */
+	char	   *cert_database;
+	NSSInitParameters params;
+
+	/*
+	 * The NSPR documentation states that runtime initialization via PR_Init
+	 * is no longer required, as the first caller into NSPR will perform the
+	 * initialization implicitly. The documentation doesn't however clarify
+	 * from which version this is holds true, so let's perform the potentially
+	 * superfluous initialization anyways to avoid crashing on older versions
+	 * of NSPR, as there is no difference in overhead.  The NSS documentation
+	 * still states that PR_Init must be called in some way (implicitly or
+	 * explicitly).
+	 *
+	 * The below parameters are what the implicit initialization would've done
+	 * for us, and should work even for older versions where it might not be
+	 * done automatically. The last parameter, maxPTDs, is set to various
+	 * values in other codebases, but has been unused since NSPR 2.1 which was
+	 * released sometime in 1998.
+	 */
+	PR_Init(PR_USER_THREAD, PR_PRIORITY_NORMAL, 0 /* maxPTDs */ );
+
+	/*
+	 * The certificate path (configdir) must contain a valid NSS database. If
+	 * the certificate path isn't a valid directory, NSS will fall back on the
+	 * system certificate database. If the certificate path is a directory but
+	 * is empty then the initialization will fail. On the client side this can
+	 * be allowed for any sslmode but the verify-xxx ones.
+	 * https://bugzilla.redhat.com/show_bug.cgi?id=728562 For the server side
+	 * we wont allow this to fail however, as we require the certificate and
+	 * key to exist.
+	 *
+	 * The original design of NSS was for a single application to use a single
+	 * copy of it, initialized with NSS_Initialize() which isn't returning any
+	 * handle with which to refer to NSS. NSS initialization and shutdown are
+	 * global for the application, so a shutdown in another NSS enabled
+	 * library would cause NSS to be stopped for libpq as well.  The fix has
+	 * been to introduce NSS_InitContext which returns a context handle to
+	 * pass to NSS_ShutdownContext.  NSS_InitContext was introduced in NSS
+	 * 3.12, but the use of it is not very well documented.
+	 * https://bugzilla.redhat.com/show_bug.cgi?id=738456
+	 *
+	 * The InitParameters struct passed can be used to override internal
+	 * values in NSS, but the usage is not documented at all. When using
+	 * NSS_Init initializations, the values are instead set via PK11_Configure
+	 * calls so the PK11_Configure documentation can be used to glean some
+	 * details on these.
+	 *
+	 * https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS/PKCS11/Module_Specs
+	 */
+	memset(&params, '\0', sizeof(params));
+	params.length = sizeof(params);
+
+	if (!ssl_database || strlen(ssl_database) == 0)
+		ereport(FATAL,
+				(errmsg("no certificate database specified")));
+
+	cert_database = psprintf("sql:%s", ssl_database);
+	nss_context = NSS_InitContext(cert_database, "", "", "",
+								  &params,
+								  NSS_INIT_READONLY | NSS_INIT_PK11RELOAD);
+	pfree(cert_database);
+
+	if (!nss_context)
+		ereport(FATAL,
+				(errmsg("unable to read certificate database \"%s\": %s",
+						ssl_database, pg_SSLerrmessage(PR_GetError()))));
+
+	/*
+	 * Set the passphrase callback which will be used both to obtain the
+	 * passphrase from the user, as well as by NSS to obtain the phrase
+	 * repeatedly.
+	 *
+	 * TODO: Figure this out - do note that we are setting another password
+	 * callback below for cert/key as well. Need to make sense of all these.
+	 */
+	PK11_SetPasswordFunc(ssl_passphrase_callback);
+
+	/*
+	 * Import the already opened socket as we don't want to use NSPR functions
+	 * for opening the network socket due to how the PostgreSQL protocol works
+	 * with TLS connections. This function is not part of the NSPR public API,
+	 * see the comment at the top of the file for the rationale of still using
+	 * it.
+	 */
+	pr_fd = PR_ImportTCPSocket(port->sock);
+	if (!pr_fd)
+		ereport(ERROR,
+				(errmsg("unable to connect to socket")));
+
+	/*
+	 * Most of the documentation available, and implementations of, NSS/NSPR
+	 * use the PR_NewTCPSocket() function here, which has the drawback that it
+	 * can only create IPv4 sockets. Instead use PR_OpenTCPSocket() which
+	 * copes with IPv6 as well.
+	 */
+	model = PR_OpenTCPSocket(port->laddr.addr.ss_family);
+	if (!model)
+		ereport(ERROR,
+				(errmsg("unable to open socket")));
+
+	/*
+	 * Convert the NSPR socket to an SSL socket. Ensuring the success of this
+	 * operation is critical as NSS SSL_* functions may return SECSuccess on
+	 * the socket even though SSL hasn't been enabled, which introduce a risk
+	 * of silent downgrades.
+	 */
+	model = SSL_ImportFD(NULL, model);
+	if (!model)
+		ereport(ERROR,
+				(errmsg("unable to enable TLS on socket")));
+
+	/*
+	 * Configure basic settings for the connection over the SSL socket in
+	 * order to set it up as a server.
+	 */
+	if (SSL_OptionSet(model, SSL_SECURITY, PR_TRUE) != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to configure TLS connection")));
+
+	if (SSL_OptionSet(model, SSL_HANDSHAKE_AS_SERVER, PR_TRUE) != SECSuccess ||
+		SSL_OptionSet(model, SSL_HANDSHAKE_AS_CLIENT, PR_FALSE) != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to configure TLS connection as server")));
+
+	/*
+	 * SSLv2 is disabled by default, and SSLv3 will be excluded from the range
+	 * of allowed protocols further down. Since we really don't want these to
+	 * ever be enabled, let's use belts and suspenders and explicitly turn
+	 * them off as well.
+	 */
+	SSL_OptionSet(model, SSL_ENABLE_SSL2, PR_FALSE);
+	SSL_OptionSet(model, SSL_ENABLE_SSL3, PR_FALSE);
+
+#ifdef SSL_CBC_RANDOM_IV
+
+	/*
+	 * Enable protection against the BEAST attack in case the NSS server has
+	 * support for that. While SSLv3 is disabled, we may still allow TLSv1
+	 * which is affected. The option isn't documented as an SSL option, but as
+	 * an NSS environment variable.
+	 */
+	SSL_OptionSet(model, SSL_CBC_RANDOM_IV, PR_TRUE);
+#endif
+
+	/*
+	 * Configure the allowed cipher. If there are no user preferred suites,
+	 * set the domestic policy. TODO: while this code works, the set of
+	 * ciphers which can be set and still end up with a working socket is
+	 * woefully underdocumented for anything more recent than SSLv3 (the code
+	 * for TLS actually calls ssl3 functions under the hood for
+	 * SSL_CipherPrefSet), so it's unclear if this is helpful or not. Using
+	 * the policies works, but may be too coarsely grained.
+	 *
+	 * Another TODO: The SSL_ImplementedCiphers table returned with calling
+	 * SSL_GetImplementedCiphers is sorted in server preference order. Sorting
+	 * SSLCipherSuites according to the order of the ciphers therein could be
+	 * a way to implement ssl_prefer_server_ciphers - if we at all want to use
+	 * cipher selection for NSS like how we do it for OpenSSL that is.
+	 */
+
+	/*
+	 * If no ciphers are specified, we use the domestic policy
+	 */
+	if (!SSLCipherSuites || strlen(SSLCipherSuites) == 0)
+	{
+		status = NSS_SetDomesticPolicy();
+		if (status != SECSuccess)
+			ereport(ERROR,
+					(errmsg("unable to set cipher policy: %s",
+							pg_SSLerrmessage(PR_GetError()))));
+	}
+	else
+	{
+		char	   *ciphers,
+				   *c;
+
+		char	   *sep = ":;, ";
+		PRUint16	ciphercode;
+		const		PRUint16 *nss_ciphers;
+
+		/*
+		 * If the user has specified a set of preferred cipher suites we start
+		 * by turning off all the existing suites to avoid the risk of down-
+		 * grades to a weaker cipher than expected.
+		 */
+		nss_ciphers = SSL_GetImplementedCiphers();
+		for (int i = 0; i < SSL_GetNumImplementedCiphers(); i++)
+			SSL_CipherPrefSet(model, nss_ciphers[i], PR_FALSE);
+
+		ciphers = pstrdup(SSLCipherSuites);
+
+		for (c = strtok(ciphers, sep); c; c = strtok(NULL, sep))
+		{
+			ciphercode = pg_find_cipher(c);
+			if (ciphercode != INVALID_CIPHER)
+			{
+				status = SSL_CipherPrefSet(model, ciphercode, PR_TRUE);
+				if (status != SECSuccess)
+					ereport(ERROR,
+							(errmsg("invalid cipher-suite specified: %s", c)));
+			}
+		}
+
+		pfree(ciphers);
+	}
+
+	if (SSL_VersionRangeSet(model, &desired_sslver) != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to set requested SSL protocol version range")));
+
+	/*
+	 * Set up the custom IO layer.
+	 */
+	layer = init_iolayer(port, ERROR);
+	if (!layer)
+		goto error;
+
+	/* Store the Port as private data available in callbacks */
+	layer->secret = (void *) port;
+
+	if (PR_PushIOLayer(pr_fd, PR_TOP_IO_LAYER, layer) != PR_SUCCESS)
+	{
+		PR_Close(layer);
+		ereport(ERROR,
+				(errmsg("unable to push IO layer")));
+	}
+
+	/* TODO: set the postgres password callback param as callback function */
+	server_cert = PK11_FindCertFromNickname(ssl_cert_file, &pwdata /* password callback */ );
+	if (!server_cert)
+		ereport(ERROR,
+				(errmsg("unable to find certificate for \"%s\": %s",
+						ssl_cert_file, pg_SSLerrmessage(PR_GetError()))));
+
+	/* TODO: set the postgres password callback param as callback function */
+	private_key = PK11_FindKeyByAnyCert(server_cert, &pwdata /* password callback */ );
+	if (!private_key)
+		ereport(ERROR,
+				(errmsg("unable to find private key for \"%s\": %s",
+						ssl_cert_file, pg_SSLerrmessage(PR_GetError()))));
+
+	/*
+	 * NSS doesn't use CRL files on disk, so we use the ssl_crl_file guc to
+	 * contain the CRL nickname for the current server certificate in the NSS
+	 * certificate database. The main difference from the OpenSSL backend is
+	 * that NSS will use the CRL regardless, but being able to make sure the
+	 * CRL is loaded seems like a good feature.
+	 */
+	if (ssl_crl_file[0])
+	{
+		SECITEM_CopyItem(NULL, &crlname, &server_cert->derSubject);
+		crl = SEC_FindCrlByName(CERT_GetDefaultCertDB(), &crlname, SEC_CRL_TYPE);
+		if (!crl)
+			ereport(ERROR,
+					(errmsg("specified CRL not found in database")));
+		SEC_DestroyCrl(crl);
+	}
+
+	/*
+	 * Finally we must configure the socket for being a server by setting the
+	 * certificate and key.
+	 */
+	status = SSL_ConfigSecureServer(model, server_cert, private_key, kt_rsa);
+	if (status != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to configure secure server: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+	status = SSL_ConfigServerCert(model, server_cert, private_key, NULL, 0);
+	if (status != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to configure server for TLS server connections: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+
+	ssl_loaded_verify_locations = true;
+
+	/*
+	 * At this point, we no longer have use for the certificate and private
+	 * key as they have been copied into the context by NSS. Destroy our
+	 * copies explicitly to clean out the memory as best we can.
+	 */
+	CERT_DestroyCertificate(server_cert);
+	SECKEY_DestroyPrivateKey(private_key);
+
+	status = SSL_AuthCertificateHook(model, pg_cert_auth_handler, (void *) port);
+	if (status != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to install authcert hook: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+	SSL_BadCertHook(model, pg_bad_cert_handler, (void *) port);
+	SSL_OptionSet(model, SSL_REQUEST_CERTIFICATE, PR_TRUE);
+	SSL_OptionSet(model, SSL_REQUIRE_CERTIFICATE, PR_FALSE);
+
+	port->pr_fd = SSL_ImportFD(model, pr_fd);
+	if (!port->pr_fd)
+		ereport(ERROR,
+				(errmsg("unable to initialize")));
+
+	PR_Close(model);
+
+	/*
+	 * Force a handshake on the next I/O request, the second parameter means
+	 * that we are a server, PR_FALSE would indicate being a client. NSPR
+	 * requires us to call SSL_ResetHandshake since we imported an already
+	 * established socket.
+	 */
+	status = SSL_ResetHandshake(port->pr_fd, PR_TRUE);
+	if (status != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to initiate handshake: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+	status = SSL_ForceHandshake(port->pr_fd);
+	if (status != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to handshake: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+
+	port->ssl_in_use = true;
+	return 0;
+
+error:
+	return 1;
+}
+
+ssize_t
+be_tls_read(Port *port, void *ptr, size_t len, int *waitfor)
+{
+	ssize_t		n_read;
+	PRErrorCode err;
+
+	n_read = PR_Read(port->pr_fd, ptr, len);
+
+	if (n_read < 0)
+	{
+		err = PR_GetError();
+
+		/* XXX: This logic seems potentially bogus? */
+		if (err == PR_WOULD_BLOCK_ERROR)
+			*waitfor = WL_SOCKET_READABLE;
+		else
+			*waitfor = WL_SOCKET_WRITEABLE;
+	}
+
+	return n_read;
+}
+
+ssize_t
+be_tls_write(Port *port, void *ptr, size_t len, int *waitfor)
+{
+	ssize_t		n_write;
+	PRErrorCode err;
+
+	n_write = PR_Send(port->pr_fd, ptr, len, 0, PR_INTERVAL_NO_WAIT);
+
+	if (n_write < 0)
+	{
+		err = PR_GetError();
+
+		if (err == PR_WOULD_BLOCK_ERROR)
+			*waitfor = WL_SOCKET_WRITEABLE;
+		else
+			*waitfor = WL_SOCKET_READABLE;
+	}
+
+	return n_write;
+}
+
+void
+be_tls_close(Port *port)
+{
+	if (!port)
+		return;
+
+	if (port->peer_cn)
+	{
+		SSL_InvalidateSession(port->pr_fd);
+		pfree(port->peer_cn);
+		port->peer_cn = NULL;
+	}
+
+	PR_Close(port->pr_fd);
+	port->pr_fd = NULL;
+	port->ssl_in_use = false;
+
+	if (nss_context)
+	{
+		NSS_ShutdownContext(nss_context);
+		nss_context = NULL;
+	}
+}
+
+void
+be_tls_destroy(void)
+{
+	/*
+	 * It reads a bit odd to clear a session cache when we are destroying the
+	 * context altogether, but if the session cache isn't cleared before
+	 * shutting down the context it will fail with SEC_ERROR_BUSY.
+	 */
+	SSL_ClearSessionCache();
+}
+
+int
+be_tls_get_cipher_bits(Port *port)
+{
+	SECStatus	status;
+	SSLChannelInfo channel;
+	SSLCipherSuiteInfo suite;
+
+	status = SSL_GetChannelInfo(port->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+		goto error;
+
+	status = SSL_GetCipherSuiteInfo(channel.cipherSuite, &suite, sizeof(suite));
+	if (status != SECSuccess)
+		goto error;
+
+	return suite.effectiveKeyBits;
+
+error:
+	ereport(WARNING,
+			(errmsg("unable to extract TLS session information: %s",
+					pg_SSLerrmessage(PR_GetError()))));
+	return 0;
+}
+
+/*
+ * be_tls_get_compression
+ *
+ * NSS disabled support for TLS compression in version 3.33 and removed the
+ * code in a subsequent release. The API for retrieving information about
+ * compression as well as enabling it is kept for backwards compatibility, but
+ * we don't need to consult it since it was only available for SSLv3 which we
+ * don't support.
+ *
+ * https://bugzilla.mozilla.org/show_bug.cgi?id=1409587
+ */
+bool
+be_tls_get_compression(Port *port)
+{
+	return false;
+}
+
+const char *
+be_tls_get_version(Port *port)
+{
+	SECStatus	status;
+	SSLChannelInfo channel;
+
+	status = SSL_GetChannelInfo(port->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+	{
+		ereport(WARNING,
+				(errmsg("unable to extract TLS session information: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+		return NULL;
+	}
+
+	return ssl_protocol_version_to_string(channel.protocolVersion);
+}
+
+const char *
+be_tls_get_cipher(Port *port)
+{
+	SECStatus	status;
+	SSLChannelInfo channel;
+	SSLCipherSuiteInfo suite;
+
+	status = SSL_GetChannelInfo(port->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+		goto error;
+
+	status = SSL_GetCipherSuiteInfo(channel.cipherSuite, &suite, sizeof(suite));
+	if (status != SECSuccess)
+		goto error;
+
+	return suite.cipherSuiteName;
+
+error:
+	ereport(WARNING,
+			(errmsg("unable to extract TLS session information: %s",
+					pg_SSLerrmessage(PR_GetError()))));
+	return NULL;
+}
+
+void
+be_tls_get_peer_subject_name(Port *port, char *ptr, size_t len)
+{
+	CERTCertificate *certificate;
+
+	certificate = SSL_PeerCertificate(port->pr_fd);
+	if (certificate)
+		strlcpy(ptr, CERT_NameToAscii(&certificate->subject), len);
+	else
+		ptr[0] = '\0';
+}
+
+void
+be_tls_get_peer_issuer_name(Port *port, char *ptr, size_t len)
+{
+	CERTCertificate *certificate;
+
+	certificate = SSL_PeerCertificate(port->pr_fd);
+	if (certificate)
+		strlcpy(ptr, CERT_NameToAscii(&certificate->issuer), len);
+	else
+		ptr[0] = '\0';
+}
+
+void
+be_tls_get_peer_serial(Port *port, char *ptr, size_t len)
+{
+	CERTCertificate *certificate;
+
+	certificate = SSL_PeerCertificate(port->pr_fd);
+	if (certificate)
+		snprintf(ptr, len, "%li", DER_GetInteger(&(certificate->serialNumber)));
+	else
+		ptr[0] = '\0';
+}
+
+static SECStatus
+pg_bad_cert_handler(void *arg, PRFileDesc * fd)
+{
+	Port	   *port = (Port *) arg;
+
+	port->peer_cert_valid = false;
+	return SECFailure;
+}
+
+static SECStatus
+pg_cert_auth_handler(void *arg, PRFileDesc * fd, PRBool checksig, PRBool isServer)
+{
+	SECStatus	status;
+	Port	   *port = (Port *) arg;
+	CERTCertificate *cert;
+	char	   *peer_cn;
+	int			len;
+
+	status = SSL_AuthCertificate(CERT_GetDefaultCertDB(), port->pr_fd, checksig, PR_TRUE);
+	if (status == SECSuccess)
+	{
+		cert = SSL_PeerCertificate(port->pr_fd);
+		len = strlen(cert->subjectName);
+		peer_cn = MemoryContextAllocZero(TopMemoryContext, len + 1);
+		if (strncmp(cert->subjectName, "CN=", 3) == 0)
+			strlcpy(peer_cn, cert->subjectName + strlen("CN="), len + 1);
+		else
+			strlcpy(peer_cn, cert->subjectName, len + 1);
+		CERT_DestroyCertificate(cert);
+
+		port->peer_cn = peer_cn;
+		port->peer_cert_valid = true;
+	}
+
+	return status;
+}
+
+/* ------------------------------------------------------------ */
+/*						Internal functions						*/
+/* ------------------------------------------------------------ */
+
+static PRInt32
+pg_ssl_read(PRFileDesc * fd, void *buf, PRInt32 amount, PRIntn flags,
+			PRIntervalTime timeout)
+{
+	PRRecvFN	read_fn;
+	PRInt32		n_read;
+
+	read_fn = fd->lower->methods->recv;
+	n_read = read_fn(fd->lower, buf, amount, flags, timeout);
+
+	return n_read;
+}
+
+static PRInt32
+pg_ssl_write(PRFileDesc * fd, const void *buf, PRInt32 amount, PRIntn flags,
+			 PRIntervalTime timeout)
+{
+	PRSendFN	send_fn;
+	PRInt32		n_write;
+
+	send_fn = fd->lower->methods->send;
+	n_write = send_fn(fd->lower, buf, amount, flags, timeout);
+
+	return n_write;
+}
+
+static PRFileDesc *
+init_iolayer(Port *port, int loglevel)
+{
+	const		PRIOMethods *default_methods;
+	PRFileDesc *layer;
+
+	/*
+	 * Start by initializing our layer with all the default methods so that we
+	 * can selectively override the ones we want while still ensuring that we
+	 * have a complete layer specification.
+	 */
+	default_methods = PR_GetDefaultIOMethods();
+	memcpy(&pr_iomethods, default_methods, sizeof(PRIOMethods));
+
+	pr_iomethods.recv = pg_ssl_read;
+	pr_iomethods.send = pg_ssl_write;
+
+	/*
+	 * Each IO layer must be identified by a unique name, where uniqueness is
+	 * per connection. Each connection in a postgres cluster can generate the
+	 * identity from the same string as they will create their IO layers on
+	 * different sockets. Only one layer per socket can have the same name.
+	 */
+	pr_id = PR_GetUniqueIdentity("PostgreSQL");
+	if (pr_id == PR_INVALID_IO_LAYER)
+	{
+		ereport(loglevel,
+				(errmsg("out of memory when setting up TLS connection")));
+		return NULL;
+	}
+
+	/*
+	 * Create the actual IO layer as a stub such that it can be pushed onto
+	 * the layer stack. The step via a stub is required as we define custom
+	 * callbacks.
+	 */
+	layer = PR_CreateIOLayerStub(pr_id, &pr_iomethods);
+	if (!layer)
+	{
+		ereport(loglevel,
+				(errmsg("unable to create NSS I/O layer")));
+		return NULL;
+	}
+
+	return layer;
+}
+
+static char *
+ssl_protocol_version_to_string(int v)
+{
+	switch (v)
+	{
+			/* SSL v2 and v3 are not supported */
+		case SSL_LIBRARY_VERSION_2:
+		case SSL_LIBRARY_VERSION_3_0:
+			Assert(false);
+			break;
+
+		case SSL_LIBRARY_VERSION_TLS_1_0:
+			return pstrdup("TLSv1.0");
+		case SSL_LIBRARY_VERSION_TLS_1_1:
+			return pstrdup("TLSv1.1");
+		case SSL_LIBRARY_VERSION_TLS_1_2:
+			return pstrdup("TLSv1.2");
+		case SSL_LIBRARY_VERSION_TLS_1_3:
+			return pstrdup("TLSv1.3");
+	}
+
+	return pstrdup("unknown");
+}
+
+
+/*
+ * ssl_protocol_version_to_nss
+ *			Translate PostgreSQL TLS version to NSS version
+ *
+ * Returns zero in case the requested TLS version is undefined (PG_ANY) and
+ * should be set by the caller, or -1 on failure.
+ */
+static uint16
+ssl_protocol_version_to_nss(int v, const char *guc_name)
+{
+	switch (v)
+	{
+			/*
+			 * There is no SSL_LIBRARY_ macro defined in NSS with the value
+			 * zero, so we use this to signal the caller that the highest
+			 * useful version should be set on the connection.
+			 */
+		case PG_TLS_ANY:
+			return 0;
+
+			/*
+			 * No guard is required here as there are no versions of NSS
+			 * without support for TLS1.
+			 */
+		case PG_TLS1_VERSION:
+			return SSL_LIBRARY_VERSION_TLS_1_0;
+		case PG_TLS1_1_VERSION:
+#ifdef SSL_LIBRARY_VERSION_TLS_1_1
+			return SSL_LIBRARY_VERSION_TLS_1_1;
+#else
+			break;
+#endif
+		case PG_TLS1_2_VERSION:
+#ifdef SSL_LIBRARY_VERSION_TLS_1_2
+			return SSL_LIBRARY_VERSION_TLS_1_2;
+#else
+			break;
+#endif
+		case PG_TLS1_3_VERSION:
+#ifdef SSL_LIBRARY_VERSION_TLS_1_3
+			return SSL_LIBRARY_VERSION_TLS_1_3;
+#else
+			break;
+#endif
+		default:
+			break;
+	}
+
+	return -1;
+}
+
+/*
+ * pg_SSLerrmessage
+ *		Create and return a human readable error message given
+ *		the specified error code
+ *
+ * PR_ErrorToName only converts the enum identifier of the error to string,
+ * but that can be quite useful for debugging (and in case PR_ErrorToString is
+ * unable to render a message then we at least have something).
+ */
+static char *
+pg_SSLerrmessage(PRErrorCode errcode)
+{
+	char		error[128];
+	int			ret;
+
+	/* TODO: this should perhaps use a StringInfo instead.. */
+	ret = pg_snprintf(error, sizeof(error), "%s (%s)",
+					  PR_ErrorToString(errcode, PR_LANGUAGE_I_DEFAULT),
+					  PR_ErrorToName(errcode));
+	if (ret)
+		return pstrdup(error);
+
+	return pstrdup(_("unknown TLS error"));
+}
diff --git a/src/backend/libpq/be-secure-openssl.c b/src/backend/libpq/be-secure-openssl.c
index 8b21ff4065..5962cffc0c 100644
--- a/src/backend/libpq/be-secure-openssl.c
+++ b/src/backend/libpq/be-secure-openssl.c
@@ -1298,15 +1298,28 @@ X509_NAME_to_cstring(X509_NAME *name)
 	char	   *dp;
 	char	   *result;
 
+	if (membuf == NULL)
+		ereport(ERROR,
+				(errcode(ERRCODE_OUT_OF_MEMORY),
+				 errmsg("failed to create BIO")));
+
 	(void) BIO_set_close(membuf, BIO_CLOSE);
 	for (i = 0; i < count; i++)
 	{
 		e = X509_NAME_get_entry(name, i);
 		nid = OBJ_obj2nid(X509_NAME_ENTRY_get_object(e));
+		if (nid == NID_undef)
+			ereport(ERROR,
+					(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
+					 errmsg("could not get NID for ASN1_OBJECT object")));
 		v = X509_NAME_ENTRY_get_data(e);
 		field_name = OBJ_nid2sn(nid);
 		if (!field_name)
 			field_name = OBJ_nid2ln(nid);
+		if (field_name == NULL)
+			ereport(ERROR,
+					(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
+					 errmsg("could not convert NID %d to an ASN1_OBJECT structure", nid)));
 		BIO_printf(membuf, "/%s=", field_name);
 		ASN1_STRING_print_ex(membuf, v,
 							 ((ASN1_STRFLGS_RFC2253 & ~ASN1_STRFLGS_ESC_MSB)
@@ -1322,7 +1335,8 @@ X509_NAME_to_cstring(X509_NAME *name)
 	result = pstrdup(dp);
 	if (dp != sp)
 		pfree(dp);
-	BIO_free(membuf);
+	if (BIO_free(membuf) != 1)
+		elog(ERROR, "could not free OpenSSL BIO structure");
 
 	return result;
 }
diff --git a/src/backend/libpq/be-secure.c b/src/backend/libpq/be-secure.c
index 2ae507a902..f39977b80c 100644
--- a/src/backend/libpq/be-secure.c
+++ b/src/backend/libpq/be-secure.c
@@ -49,6 +49,9 @@ bool		ssl_passphrase_command_supports_reload;
 #ifdef USE_SSL
 bool		ssl_loaded_verify_locations = false;
 #endif
+#ifdef USE_NSS
+char	   *ssl_database;
+#endif
 
 /* GUC variable controlling SSL cipher list */
 char	   *SSLCipherSuites = NULL;
diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c
index de87ad6ef7..33c3eebf48 100644
--- a/src/backend/utils/misc/guc.c
+++ b/src/backend/utils/misc/guc.c
@@ -4262,7 +4262,11 @@ static struct config_string ConfigureNamesString[] =
 		},
 		&ssl_library,
 #ifdef USE_SSL
+#if defined(USE_OPENSSL)
 		"OpenSSL",
+#elif defined(USE_NSS)
+		"NSS",
+#endif
 #else
 		"",
 #endif
@@ -4320,6 +4324,18 @@ static struct config_string ConfigureNamesString[] =
 		check_canonical_path, assign_pgstat_temp_directory, NULL
 	},
 
+#ifdef USE_NSS
+	{
+		{"ssl_database", PGC_SIGHUP, CONN_AUTH_SSL,
+			gettext_noop("Location of the NSS certificate database."),
+			NULL
+		},
+		&ssl_database,
+		"",
+		NULL, NULL, NULL
+	},
+#endif
+
 	{
 		{"synchronous_standby_names", PGC_SIGHUP, REPLICATION_PRIMARY,
 			gettext_noop("Number of synchronous standbys and list of names of potential synchronous ones."),
@@ -4348,8 +4364,10 @@ static struct config_string ConfigureNamesString[] =
 			GUC_SUPERUSER_ONLY
 		},
 		&SSLCipherSuites,
-#ifdef USE_OPENSSL
+#if defined(USE_OPENSSL)
 		"HIGH:MEDIUM:+3DES:!aNULL",
+#elif defined (USE_NSS)
+		"",
 #else
 		"none",
 #endif
diff --git a/src/include/common/pg_nss.h b/src/include/common/pg_nss.h
new file mode 100644
index 0000000000..74298c8bb1
--- /dev/null
+++ b/src/include/common/pg_nss.h
@@ -0,0 +1,141 @@
+/*-------------------------------------------------------------------------
+ *
+ * pg_nss.h
+ *	  Support for NSS as a TLS backend
+ *
+ * These definitions are used by both frontend and backend code.
+ *
+ * Copyright (c) 2020, PostgreSQL Global Development Group
+ *
+ * IDENTIFICATION
+ *        src/include/common/pg_nss.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef PG_NSS_H
+#define PG_NSS_H
+
+#ifdef USE_NSS
+
+#include <sslproto.h>
+
+PRUint16	pg_find_cipher(char *name);
+
+typedef struct
+{
+	const char *name;
+	PRUint16	number;
+}			NSSCiphers;
+
+#define INVALID_CIPHER	0xFFFF
+
+/*
+ * This list is a partial copy of the ciphers in NSS files lib/ssl/sslproto.h
+ * in order to provide a human readable version of the ciphers. It would be
+ * nice to not have to have this, but NSS doesn't provide any API addressing
+ * the ciphers by name. TODO: do we want more of the ciphers, or perhaps less?
+ */
+static const NSSCiphers NSS_CipherList[] = {
+
+	{"TLS_NULL_WITH_NULL_NULL", TLS_NULL_WITH_NULL_NULL},
+
+	{"TLS_RSA_WITH_NULL_MD5", TLS_RSA_WITH_NULL_MD5},
+	{"TLS_RSA_WITH_NULL_SHA", TLS_RSA_WITH_NULL_SHA},
+	{"TLS_RSA_WITH_RC4_128_MD5", TLS_RSA_WITH_RC4_128_MD5},
+	{"TLS_RSA_WITH_RC4_128_SHA", TLS_RSA_WITH_RC4_128_SHA},
+	{"TLS_RSA_WITH_IDEA_CBC_SHA", TLS_RSA_WITH_IDEA_CBC_SHA},
+	{"TLS_RSA_WITH_DES_CBC_SHA", TLS_RSA_WITH_DES_CBC_SHA},
+	{"TLS_RSA_WITH_3DES_EDE_CBC_SHA", TLS_RSA_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_DH_DSS_WITH_DES_CBC_SHA", TLS_DH_DSS_WITH_DES_CBC_SHA},
+	{"TLS_DH_DSS_WITH_3DES_EDE_CBC_SHA", TLS_DH_DSS_WITH_3DES_EDE_CBC_SHA},
+	{"TLS_DH_RSA_WITH_DES_CBC_SHA", TLS_DH_RSA_WITH_DES_CBC_SHA},
+	{"TLS_DH_RSA_WITH_3DES_EDE_CBC_SHA", TLS_DH_RSA_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_DHE_DSS_WITH_DES_CBC_SHA", TLS_DHE_DSS_WITH_DES_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_3DES_EDE_CBC_SHA", TLS_DHE_DSS_WITH_3DES_EDE_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_DES_CBC_SHA", TLS_DHE_RSA_WITH_DES_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA", TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_DH_anon_WITH_RC4_128_MD5", TLS_DH_anon_WITH_RC4_128_MD5},
+	{"TLS_DH_anon_WITH_DES_CBC_SHA", TLS_DH_anon_WITH_DES_CBC_SHA},
+	{"TLS_DH_anon_WITH_3DES_EDE_CBC_SHA", TLS_DH_anon_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_RSA_WITH_AES_128_CBC_SHA", TLS_RSA_WITH_AES_128_CBC_SHA},
+	{"TLS_DH_DSS_WITH_AES_128_CBC_SHA", TLS_DH_DSS_WITH_AES_128_CBC_SHA},
+	{"TLS_DH_RSA_WITH_AES_128_CBC_SHA", TLS_DH_RSA_WITH_AES_128_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_AES_128_CBC_SHA", TLS_DHE_DSS_WITH_AES_128_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_AES_128_CBC_SHA", TLS_DHE_RSA_WITH_AES_128_CBC_SHA},
+	{"TLS_DH_anon_WITH_AES_128_CBC_SHA", TLS_DH_anon_WITH_AES_128_CBC_SHA},
+
+	{"TLS_RSA_WITH_AES_256_CBC_SHA", TLS_RSA_WITH_AES_256_CBC_SHA},
+	{"TLS_DH_DSS_WITH_AES_256_CBC_SHA", TLS_DH_DSS_WITH_AES_256_CBC_SHA},
+	{"TLS_DH_RSA_WITH_AES_256_CBC_SHA", TLS_DH_RSA_WITH_AES_256_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_AES_256_CBC_SHA", TLS_DHE_DSS_WITH_AES_256_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_AES_256_CBC_SHA", TLS_DHE_RSA_WITH_AES_256_CBC_SHA},
+	{"TLS_DH_anon_WITH_AES_256_CBC_SHA", TLS_DH_anon_WITH_AES_256_CBC_SHA},
+	{"TLS_RSA_WITH_NULL_SHA256", TLS_RSA_WITH_NULL_SHA256},
+	{"TLS_RSA_WITH_AES_128_CBC_SHA256", TLS_RSA_WITH_AES_128_CBC_SHA256},
+	{"TLS_RSA_WITH_AES_256_CBC_SHA256", TLS_RSA_WITH_AES_256_CBC_SHA256},
+
+	{"TLS_DHE_DSS_WITH_AES_128_CBC_SHA256", TLS_DHE_DSS_WITH_AES_128_CBC_SHA256},
+	{"TLS_RSA_WITH_CAMELLIA_128_CBC_SHA", TLS_RSA_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DH_DSS_WITH_CAMELLIA_128_CBC_SHA", TLS_DH_DSS_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DH_RSA_WITH_CAMELLIA_128_CBC_SHA", TLS_DH_RSA_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_CAMELLIA_128_CBC_SHA", TLS_DHE_DSS_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA", TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DH_anon_WITH_CAMELLIA_128_CBC_SHA", TLS_DH_anon_WITH_CAMELLIA_128_CBC_SHA},
+
+	{"TLS_DHE_DSS_WITH_RC4_128_SHA", TLS_DHE_DSS_WITH_RC4_128_SHA},
+	{"TLS_DHE_RSA_WITH_AES_128_CBC_SHA256", TLS_DHE_RSA_WITH_AES_128_CBC_SHA256},
+	{"TLS_DHE_DSS_WITH_AES_256_CBC_SHA256", TLS_DHE_DSS_WITH_AES_256_CBC_SHA256},
+	{"TLS_DHE_RSA_WITH_AES_256_CBC_SHA256", TLS_DHE_RSA_WITH_AES_256_CBC_SHA256},
+
+	{"TLS_RSA_WITH_CAMELLIA_256_CBC_SHA", TLS_RSA_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DH_DSS_WITH_CAMELLIA_256_CBC_SHA", TLS_DH_DSS_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DH_RSA_WITH_CAMELLIA_256_CBC_SHA", TLS_DH_RSA_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_CAMELLIA_256_CBC_SHA", TLS_DHE_DSS_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA", TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DH_anon_WITH_CAMELLIA_256_CBC_SHA", TLS_DH_anon_WITH_CAMELLIA_256_CBC_SHA},
+
+	{"TLS_RSA_WITH_SEED_CBC_SHA", TLS_RSA_WITH_SEED_CBC_SHA},
+
+	{"TLS_RSA_WITH_AES_128_GCM_SHA256", TLS_RSA_WITH_AES_128_GCM_SHA256},
+	{"TLS_RSA_WITH_AES_256_GCM_SHA384", TLS_RSA_WITH_AES_256_GCM_SHA384},
+	{"TLS_DHE_RSA_WITH_AES_128_GCM_SHA256", TLS_DHE_RSA_WITH_AES_128_GCM_SHA256},
+	{"TLS_DHE_RSA_WITH_AES_256_GCM_SHA384", TLS_DHE_RSA_WITH_AES_256_GCM_SHA384},
+	{"TLS_DHE_DSS_WITH_AES_128_GCM_SHA256", TLS_DHE_DSS_WITH_AES_128_GCM_SHA256},
+	{"TLS_DHE_DSS_WITH_AES_256_GCM_SHA384", TLS_DHE_DSS_WITH_AES_256_GCM_SHA384},
+
+	{"TLS_AES_128_GCM_SHA256", TLS_AES_128_GCM_SHA256},
+	{"TLS_AES_256_GCM_SHA384", TLS_AES_256_GCM_SHA384},
+	{"TLS_CHACHA20_POLY1305_SHA256", TLS_CHACHA20_POLY1305_SHA256},
+	{NULL, 0}
+};
+
+/*
+ * pg_find_cipher
+ *			Translate an NSS ciphername to the cipher code
+ *
+ * Searches the configured ciphers for the corresponding cipher code to the
+ * name. Search is performed case insensitive.
+ */
+PRUint16
+pg_find_cipher(char *name)
+{
+	const		NSSCiphers *cipher_list = NSS_CipherList;
+
+	while (cipher_list->name)
+	{
+		if (pg_strcasecmp(cipher_list->name, name) == 0)
+			return cipher_list->number;
+
+		cipher_list++;
+	}
+
+	return 0xFFFF;
+}
+
+#endif							/* USE_NSS */
+
+#endif							/* PG_NSS_H */
diff --git a/src/include/libpq/libpq-be.h b/src/include/libpq/libpq-be.h
index 179ebaa104..6211510fab 100644
--- a/src/include/libpq/libpq-be.h
+++ b/src/include/libpq/libpq-be.h
@@ -192,13 +192,18 @@ typedef struct Port
 	bool		peer_cert_valid;
 
 	/*
-	 * OpenSSL structures. (Keep these last so that the locations of other
-	 * fields are the same whether or not you build with OpenSSL.)
+	 * SSL backend specific structures. (Keep these last so that the locations
+	 * of other fields are the same whether or not you build with SSL
+	 * enabled.)
 	 */
 #ifdef USE_OPENSSL
 	SSL		   *ssl;
 	X509	   *peer;
 #endif
+
+#ifdef USE_NSS
+	void	   *pr_fd;
+#endif
 } Port;
 
 #ifdef USE_SSL
diff --git a/src/include/libpq/libpq.h b/src/include/libpq/libpq.h
index b1152475ac..298d87ecae 100644
--- a/src/include/libpq/libpq.h
+++ b/src/include/libpq/libpq.h
@@ -88,6 +88,9 @@ extern PGDLLIMPORT bool ssl_passphrase_command_supports_reload;
 #ifdef USE_SSL
 extern bool ssl_loaded_verify_locations;
 #endif
+#ifdef USE_NSS
+extern char *ssl_database;
+#endif
 
 extern int	secure_initialize(bool isServerStart);
 extern bool secure_loaded_verify_locations(void);
diff --git a/src/include/pg_config.h.in b/src/include/pg_config.h.in
index fb270df678..31f808398c 100644
--- a/src/include/pg_config.h.in
+++ b/src/include/pg_config.h.in
@@ -893,6 +893,9 @@
 /* Define to 1 to build with PAM support. (--with-pam) */
 #undef USE_PAM
 
+/* Define to build with NSS support (--with-nss) */
+#undef USE_NSS
+
 /* Define to 1 to use software CRC-32C implementation (slicing-by-8). */
 #undef USE_SLICING_BY_8_CRC32C
 
diff --git a/src/include/pg_config_manual.h b/src/include/pg_config_manual.h
index 705dc69c06..c28b84126d 100644
--- a/src/include/pg_config_manual.h
+++ b/src/include/pg_config_manual.h
@@ -176,10 +176,9 @@
 
 /*
  * USE_SSL code should be compiled only when compiling with an SSL
- * implementation.  (Currently, only OpenSSL is supported, but we might add
- * more implementations in the future.)
+ * implementation.
  */
-#ifdef USE_OPENSSL
+#if defined(USE_OPENSSL) || defined(USE_NSS)
 #define USE_SSL
 #endif
 
diff --git a/src/interfaces/libpq/Makefile b/src/interfaces/libpq/Makefile
index d4919970f8..97821fb39b 100644
--- a/src/interfaces/libpq/Makefile
+++ b/src/interfaces/libpq/Makefile
@@ -57,6 +57,10 @@ OBJS += \
 	fe-secure-gssapi.o
 endif
 
+ifeq ($(with_nss), yes)
+OBJS += fe-secure-nss.o
+endif
+
 ifeq ($(PORTNAME), cygwin)
 override shlib = cyg$(NAME)$(DLSUFFIX)
 endif
diff --git a/src/interfaces/libpq/fe-connect.c b/src/interfaces/libpq/fe-connect.c
index 7bee9dd201..2814eb8ddd 100644
--- a/src/interfaces/libpq/fe-connect.c
+++ b/src/interfaces/libpq/fe-connect.c
@@ -354,6 +354,10 @@ static const internalPQconninfoOption PQconninfoOptions[] = {
 		"Target-Session-Attrs", "", 11, /* sizeof("read-write") = 11 */
 	offsetof(struct pg_conn, target_session_attrs)},
 
+	{"cert_database", NULL, NULL, NULL,
+		"CertificateDatabase", "", 64,
+	offsetof(struct pg_conn, cert_database)},
+
 	/* Terminating entry --- MUST BE LAST */
 	{NULL, NULL, NULL, NULL,
 	NULL, NULL, 0}
diff --git a/src/interfaces/libpq/fe-secure-nss.c b/src/interfaces/libpq/fe-secure-nss.c
new file mode 100644
index 0000000000..6401949136
--- /dev/null
+++ b/src/interfaces/libpq/fe-secure-nss.c
@@ -0,0 +1,975 @@
+/*-------------------------------------------------------------------------
+ *
+ * fe-secure-nss.c
+ *	  functions for supporting NSS as a TLS backend for frontend libpq
+ *
+ * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ *	  src/interfaces/libpq/fe-secure-nss.c
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#include "postgres_fe.h"
+
+#include "libpq-fe.h"
+#include "fe-auth.h"
+#include "libpq-int.h"
+
+/*
+ * BITS_PER_BYTE is also defined in the NSPR header fils, so we need to undef
+ * our version to avoid compiler warnings on redefinition.
+ */
+#define pg_BITS_PER_BYTE BITS_PER_BYTE
+#undef BITS_PER_BYTE
+
+/*
+ * The nspr/obsolete/protypes.h NSPR header typedefs uint64 and int64 with
+ * colliding definitions from ours, causing a much expected compiler error.
+ * The definitions are however not actually used in NSPR at all, and are only
+ * intended for what seems to be backwards compatibility for apps written
+ * against old versions of NSPR.  The following comment is in the referenced
+ * file, and was added in 1998:
+ *
+ *		This section typedefs the old 'native' types to the new PR<type>s.
+ *		These definitions are scheduled to be eliminated at the earliest
+ *		possible time. The NSPR API is implemented and documented using
+ *		the new definitions.
+ *
+ * As there is no opt-out from pulling in these typedefs, we define the guard
+ * for the file to exclude it. This is incredibly ugly, but seems to be about
+ * the only way around it.
+ */
+#define PROTYPES_H
+#include <nspr.h>
+#undef PROTYPES_H
+#include <nss.h>
+#include <ssl.h>
+#include <sslproto.h>
+#include <pk11func.h>
+#include <prerror.h>
+#include <prinit.h>
+#include <prio.h>
+#include <secerr.h>
+#include <secmod.h>
+
+/*
+ * Ensure that the colliding definitions match, else throw an error. In case
+ * NSPR remove the definition in a future version (however unlikely that may
+ * be, make sure to put ours back again.
+ */
+#if defined(BITS_PER_BYTE)
+#if BITS_PER_BYTE != pg_BITS_PER_BYTE
+#error "incompatible byte widths between NSPR and PostgreSQL"
+#endif
+#else
+#define BITS_PER_BYTE pg_BITS_PER_BYTE
+#endif
+#undef pg_BITS_PER_BYTE
+
+static SECStatus pg_load_nss_module(SECMODModule * *module, const char *library, const char *name);
+static SECStatus pg_bad_cert_handler(void *arg, PRFileDesc * fd);
+static char *pg_SSLerrmessage(PRErrorCode errcode);
+static SECStatus pg_client_auth_handler(void *arg, PRFileDesc * socket, CERTDistNames * caNames,
+										CERTCertificate * *pRetCert, SECKEYPrivateKey * *pRetKey);
+static SECStatus pg_cert_auth_handler(void *arg, PRFileDesc * fd, PRBool checksig, PRBool isServer);
+static int	ssl_protocol_version_to_nss(const char *protocol);
+static bool cert_database_has_CA(PGconn *conn);
+
+static char *PQssl_passwd_cb(PK11SlotInfo * slot, PRBool retry, void *arg);
+
+/*
+ * PR_ImportTCPSocket() is a private API, but very widely used, as it's the
+ * only way to make NSS use an already set up POSIX file descriptor rather
+ * than opening one itself. To quote the NSS documentation:
+ *
+ *		"In theory, code that uses PR_ImportTCPSocket may break when NSPR's
+ *		implementation changes. In practice, this is unlikely to happen because
+ *		NSPR's implementation has been stable for years and because of NSPR's
+ *		strong commitment to backward compatibility."
+ *
+ * https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSPR/Reference/PR_ImportTCPSocket
+ *
+ * The function is declared in <private/pprio.h>, but as it is a header marked
+ * private we declare it here rather than including it.
+ */
+NSPR_API(PRFileDesc *) PR_ImportTCPSocket(int);
+
+static SECMODModule * ca_trust = NULL;
+static NSSInitContext * nss_context = NULL;
+
+/*
+ * Track whether the NSS database has a password set or not. There is no API
+ * function for retrieving password status, so we simply flip this to true in
+ * case NSS invoked the password callback - as that will only happen in case
+ * there is a password. The reason for tracking this is that there are calls
+ * which require a password parameter, but doesn't use the callbacks provided,
+ * so we must call the callback on behalf of these.
+ */
+static bool has_password = false;
+
+#if defined(WIN32)
+static const char *ca_trust_name = "nssckbi.dll";
+#elif defined(__darwin__)
+static const char *ca_trust_name = "libnssckbi.dylib";
+#else
+static const char *ca_trust_name = "libnssckbi.so";
+#endif
+
+static PQsslKeyPassHook_nss_type PQsslKeyPassHook = NULL;
+
+/* ------------------------------------------------------------ */
+/*			 Procedures common to all secure sessions			*/
+/* ------------------------------------------------------------ */
+
+void
+pgtls_init_library(bool do_ssl, int do_crypto)
+{
+	/* TODO: implement me .. */
+}
+
+int
+pgtls_init(PGconn *conn)
+{
+	conn->ssl_in_use = false;
+
+	return 0;
+}
+
+void
+pgtls_close(PGconn *conn)
+{
+	if (nss_context)
+	{
+		NSS_ShutdownContext(nss_context);
+		nss_context = NULL;
+	}
+}
+
+PostgresPollingStatusType
+pgtls_open_client(PGconn *conn)
+{
+	SECStatus	status;
+	PRFileDesc *pr_fd;
+	PRFileDesc *model;
+	NSSInitParameters params;
+	SSLVersionRange desired_range;
+
+	/*
+	 * The NSPR documentation states that runtime initialization via PR_Init
+	 * is no longer required, as the first caller into NSPR will perform the
+	 * initialization implicitly. The documentation doesn't however clarify
+	 * from which version this is holds true, so let's perform the potentially
+	 * superfluous initialization anyways to avoid crashing on older versions
+	 * of NSPR, as there is no difference in overhead.  The NSS documentation
+	 * still states that PR_Init must be called in some way (implicitly or
+	 * explicitly).
+	 *
+	 * The below parameters are what the implicit initialization would've done
+	 * for us, and should work even for older versions where it might not be
+	 * done automatically. The last parameter, maxPTDs, is set to various
+	 * values in other codebases, but has been unused since NSPR 2.1 which was
+	 * released sometime in 1998.
+	 */
+	PR_Init(PR_USER_THREAD, PR_PRIORITY_NORMAL, 0);
+
+	/*
+	 * The original design of NSS was for a single application to use a single
+	 * copy of it, initialized with NSS_Initialize() which isn't returning any
+	 * handle with which to refer to NSS. NSS initialization and shutdown are
+	 * global for the application, so a shutdown in another NSS enabled
+	 * library would cause NSS to be stopped for libpq as well.  The fix has
+	 * been to introduce NSS_InitContext which returns a context handle to
+	 * pass to NSS_ShutdownContext.  NSS_InitContext was introduced in NSS
+	 * 3.12, but the use of it is not very well documented.
+	 * https://bugzilla.redhat.com/show_bug.cgi?id=738456
+	 *
+	 * The InitParameters struct passed can be used to override internal
+	 * values in NSS, but the usage is not documented at all. When using
+	 * NSS_Init initializations, the values are instead set via PK11_Configure
+	 * calls so the PK11_Configure documentation can be used to glean some
+	 * details on these.
+	 *
+	 * https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS/PKCS11/Module_Specs
+	 */
+	memset(&params, 0, sizeof(params));
+	params.length = sizeof(params);
+
+	if (conn->cert_database && strlen(conn->cert_database) > 0)
+	{
+		char	   *cert_database_path = psprintf("sql:%s", conn->cert_database);
+
+		nss_context = NSS_InitContext(cert_database_path, "", "", "",
+									  &params,
+									  NSS_INIT_READONLY | NSS_INIT_PK11RELOAD);
+		pfree(cert_database_path);
+	}
+	else
+		nss_context = NSS_InitContext("", "", "", "", &params,
+									  NSS_INIT_READONLY | NSS_INIT_NOCERTDB |
+									  NSS_INIT_NOMODDB | NSS_INIT_FORCEOPEN |
+									  NSS_INIT_NOROOTINIT | NSS_INIT_PK11RELOAD);
+
+	if (!nss_context)
+	{
+		char	   *err = pg_SSLerrmessage(PR_GetError());
+
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to %s certificate database: %s"),
+						  conn->cert_database ? "open" : "create",
+						  err);
+		free(err);
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * Configure cipher policy.
+	 */
+	status = NSS_SetDomesticPolicy();
+	if (status != SECSuccess)
+	{
+		char	   *err = pg_SSLerrmessage(PR_GetError());
+
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to configure cipher policy: %s"),
+						  err);
+		free(err);
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * If we don't have a certificate database, the system trust store is the
+	 * fallback we can use. If we fail to initialize that as well, we can
+	 * still attempt a connection as long as the sslmode isn't verify*.
+	 */
+	if (!conn->cert_database && conn->sslmode[0] == 'v')
+	{
+		status = pg_load_nss_module(&ca_trust, ca_trust_name, "\"Root Certificates\"");
+		/* status = pg_load_nss_module(&ca_trust, ca_trust_name, "trust"); */
+		if (status != SECSuccess)
+		{
+			char	   *err = pg_SSLerrmessage(PR_GetError());
+
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("WARNING: unable to load NSS trust module \"%s\" : %s"), ca_trust_name, err);
+			return PGRES_POLLING_FAILED;
+		}
+	}
+
+
+	PK11_SetPasswordFunc(PQssl_passwd_cb);
+
+	/*
+	 * Import the already opened socket as we don't want to use NSPR functions
+	 * for opening the network socket due to how the PostgreSQL protocol works
+	 * with TLS connections. This function is not part of the NSPR public API,
+	 * see the comment at the top of the file for the rationale of still using
+	 * it.
+	 */
+	pr_fd = PR_ImportTCPSocket(conn->sock);
+	if (!pr_fd)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to attach to socket: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * Most of the documentation available, and implementations of, NSS/NSPR
+	 * use the PR_NewTCPSocket() function here, which has the drawback that it
+	 * can only create IPv4 sockets. Instead use PR_OpenTCPSocket() which
+	 * copes with IPv6 as well.
+	 */
+	model = SSL_ImportFD(NULL, PR_OpenTCPSocket(conn->laddr.addr.ss_family));
+	if (!model)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to enable TLS: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/* Disable old protocol versions (SSLv2 and SSLv3) */
+	SSL_OptionSet(model, SSL_ENABLE_SSL2, PR_FALSE);
+	SSL_OptionSet(model, SSL_V2_COMPATIBLE_HELLO, PR_FALSE);
+	SSL_OptionSet(model, SSL_ENABLE_SSL3, PR_FALSE);
+
+#ifdef SSL_CBC_RANDOM_IV
+
+	/*
+	 * Enable protection against the BEAST attack in case the NSS library has
+	 * support for that. While SSLv3 is disabled, we may still allow TLSv1
+	 * which is affected. The option isn't documented as an SSL option, but as
+	 * an NSS environment variable.
+	 */
+	SSL_OptionSet(model, SSL_CBC_RANDOM_IV, PR_TRUE);
+#endif
+
+	/* Set us up as a TLS client for the handshake */
+	SSL_OptionSet(model, SSL_HANDSHAKE_AS_CLIENT, PR_TRUE);
+
+	/*
+	 * When setting the available protocols, we either use the user defined
+	 * configuration values, and if missing we accept whatever is the highest
+	 * version supported by the library as the max and only limit the range in
+	 * the other end at TLSv1.0. ssl_variant_stream is a ProtocolVariant enum
+	 * for Stream protocols, rather than datagram.
+	 */
+	SSL_VersionRangeGetSupported(ssl_variant_stream, &desired_range);
+	desired_range.min = SSL_LIBRARY_VERSION_TLS_1_0;
+
+	if (conn->ssl_min_protocol_version && strlen(conn->ssl_min_protocol_version) > 0)
+	{
+		int			ssl_min_ver = ssl_protocol_version_to_nss(conn->ssl_min_protocol_version);
+
+		if (ssl_min_ver == -1)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("invalid value \"%s\" for minimum version of SSL protocol\n"),
+							  conn->ssl_min_protocol_version);
+			return -1;
+		}
+
+		desired_range.min = ssl_min_ver;
+	}
+
+	if (conn->ssl_max_protocol_version && strlen(conn->ssl_max_protocol_version) > 0)
+	{
+		int			ssl_max_ver = ssl_protocol_version_to_nss(conn->ssl_max_protocol_version);
+
+		if (ssl_max_ver == -1)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("invalid value \"%s\" for maximum version of SSL protocol\n"),
+							  conn->ssl_max_protocol_version);
+			return -1;
+		}
+
+		desired_range.max = ssl_max_ver;
+	}
+
+	if (SSL_VersionRangeSet(model, &desired_range) != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to set allowed SSL protocol version range: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * Set up callback for verifying server certificates, as well as for how
+	 * to handle failed verifications.
+	 */
+	SSL_AuthCertificateHook(model, pg_cert_auth_handler, (void *) conn);
+	SSL_BadCertHook(model, pg_bad_cert_handler, (void *) conn);
+
+	/*
+	 * Convert the NSPR socket to an SSL socket. Ensuring the success of this
+	 * operation is critical as NSS SSL_* functions may return SECSuccess on
+	 * the socket even though SSL hasn't been enabled, which introduce a risk
+	 * of silent downgrades.
+	 */
+	conn->pr_fd = SSL_ImportFD(model, pr_fd);
+	if (!conn->pr_fd)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to configure client for TLS: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * The model can now we closed as we've applied the settings of the model
+	 * onto the real socket. From hereon we should only use conn->pr_fd.
+	 */
+	PR_Close(model);
+
+	/* Set the private data to be passed to the password callback */
+	SSL_SetPKCS11PinArg(conn->pr_fd, (void *) conn);
+
+	/*
+	 * If a CRL file has been specified, verify if it exists in the database
+	 * but don't fail in case it doesn't.
+	 */
+	if (conn->sslcrl && strlen(conn->sslcrl) > 0)
+	{
+		/* XXX: Implement me.. */
+	}
+
+	status = SSL_ResetHandshake(conn->pr_fd, PR_FALSE);
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to initiate handshake: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * Set callback for client authentication when requested by the server.
+	 */
+	SSL_GetClientAuthDataHook(conn->pr_fd, pg_client_auth_handler, (void *) conn);
+
+	/*
+	 * Specify which hostname we are expecting to talk to. This is required,
+	 * albeit mostly applies to when opening a connection to a traditional
+	 * http server it seems.
+	 */
+	SSL_SetURL(conn->pr_fd, (conn->connhost[conn->whichhost]).host);
+
+	do
+	{
+		status = SSL_ForceHandshake(conn->pr_fd);
+	}
+	while (status != SECSuccess && PR_GetError() == PR_WOULD_BLOCK_ERROR);
+
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("SSL error: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	conn->ssl_in_use = true;
+	return PGRES_POLLING_OK;
+}
+
+ssize_t
+pgtls_read(PGconn *conn, void *ptr, size_t len)
+{
+	PRInt32		nread;
+	PRErrorCode status;
+	int			read_errno = 0;
+
+	nread = PR_Recv(conn->pr_fd, ptr, len, 0, PR_INTERVAL_NO_WAIT);
+
+	/*
+	 * PR_Recv blocks until there is data to read or the timeout expires. Zero
+	 * is returned for closed connections, while -1 indicates an error within
+	 * the ongoing connection.
+	 */
+	if (nread == 0)
+	{
+		read_errno = ECONNRESET;
+		return -1;
+	}
+
+	if (nread == -1)
+	{
+		status = PR_GetError();
+
+		switch (status)
+		{
+			case PR_WOULD_BLOCK_ERROR:
+				read_errno = EINTR;
+				break;
+
+			case PR_IO_TIMEOUT_ERROR:
+				break;
+
+				/*
+				 * The error cases for PR_Recv are not documented, but can be
+				 * reverse engineered from _MD_unix_map_default_error() in the
+				 * NSPR code, defined in pr/src/md/unix/unix_errors.c.
+				 */
+			default:
+				printfPQExpBuffer(&conn->errorMessage,
+								  libpq_gettext("TLS read error: %s"),
+								  pg_SSLerrmessage(status));
+				break;
+		}
+	}
+
+	SOCK_ERRNO_SET(read_errno);
+	return (ssize_t) nread;
+}
+
+/*
+ * pgtls_read_pending
+ *		Check for the existence of data to be read.
+ *
+ * This is part of the PostgreSQL TLS backend API.
+ */
+bool
+pgtls_read_pending(PGconn *conn)
+{
+	unsigned char c;
+	int			n;
+
+	/*
+	 * PR_Recv peeks into the stream with the timeount turned off, to see if
+	 * there is another byte to read off the wire. There is an NSS function
+	 * SSL_DataPending() which might seem like a better fit, but it will only
+	 * check already encrypted data in the SSL buffer, not still unencrypted
+	 * data, thus it doesn't guarantee that a subsequent call to
+	 * PR_Read/PR_Recv wont block.
+	 */
+	n = PR_Recv(conn->pr_fd, &c, 1, PR_MSG_PEEK, PR_INTERVAL_NO_WAIT);
+	return (n > 0);
+}
+
+ssize_t
+pgtls_write(PGconn *conn, const void *ptr, size_t len)
+{
+	PRInt32		n;
+	PRErrorCode status;
+	int			write_errno = 0;
+
+	n = PR_Write(conn->pr_fd, ptr, len);
+
+	if (n < 0)
+	{
+		status = PR_GetError();
+
+		switch (status)
+		{
+			case PR_WOULD_BLOCK_ERROR:
+#ifdef EAGAIN
+				write_errno = EAGAIN;
+#else
+				write_errno = EINTR;
+#endif
+				break;
+
+			default:
+				printfPQExpBuffer(&conn->errorMessage,
+								  libpq_gettext("TLS write error: %s"),
+								  pg_SSLerrmessage(status));
+				write_errno = ECONNRESET;
+				break;
+		}
+	}
+
+	SOCK_ERRNO_SET(write_errno);
+	return (ssize_t) n;
+}
+
+/*
+ *	Verify that the server certificate matches the hostname we connected to.
+ *
+ * The certificate's Common Name and Subject Alternative Names are considered.
+ */
+int
+pgtls_verify_peer_name_matches_certificate_guts(PGconn *conn,
+												int *names_examined,
+												char **first_name)
+{
+	return 1;
+}
+
+/* ------------------------------------------------------------ */
+/*			PostgreSQL specific TLS support functions			*/
+/* ------------------------------------------------------------ */
+
+/*
+ * TODO: this a 99% copy of the same function in the backend, make these share
+ * a single implementation instead.
+ */
+static char *
+pg_SSLerrmessage(PRErrorCode errcode)
+{
+	const char *error;
+
+	error = PR_ErrorToName(errcode);
+	if (error)
+		return strdup(error);
+
+	return strdup("unknown TLS error");
+}
+
+static SECStatus
+pg_load_nss_module(SECMODModule * *module, const char *library, const char *name)
+{
+	SECMODModule *mod;
+	char	   *modulespec;
+
+	modulespec = psprintf("library=\"%s\", name=\"%s\"", library, name);
+
+	/*
+	 * Attempt to load the specified module. The second parameter is "parent"
+	 * which should always be NULL for application code. The third parameter
+	 * defines if loading should recurse which is only applicable when loading
+	 * a module from within another module. This hierarchy would have to be
+	 * defined in the modulespec, and since we don't support anything but
+	 * directly addressed modules we should pass PR_FALSE.
+	 */
+	mod = SECMOD_LoadUserModule(modulespec, NULL, PR_FALSE);
+	pfree(modulespec);
+
+	if (mod && mod->loaded)
+	{
+		*module = mod;
+		return SECSuccess;
+	}
+
+	SECMOD_DestroyModule(mod);
+	return SECFailure;
+}
+
+/* ------------------------------------------------------------ */
+/*						NSS Callbacks							*/
+/* ------------------------------------------------------------ */
+
+/*
+ * pg_cert_auth_handler
+ *			Callback for authenticating server certificate
+ *
+ * This is pretty much the same procedure as the SSL_AuthCertificate function
+ * provided by NSS, with the difference being server hostname validation. With
+ * SSL_AuthCertificate there is no way to do verify-ca, it only does the -full
+ * flavor of our sslmodes, so we need our own implementation.
+ */
+static SECStatus
+pg_cert_auth_handler(void *arg, PRFileDesc * fd, PRBool checksig, PRBool isServer)
+{
+	SECStatus	status;
+	PGconn	   *conn = (PGconn *) arg;
+	char	   *server_hostname = NULL;
+	CERTCertificate *server_cert;
+	void	   *pin;
+
+	Assert(!isServer);
+
+	pin = SSL_RevealPinArg(conn->pr_fd);
+	server_cert = SSL_PeerCertificate(conn->pr_fd);
+
+	status = CERT_VerifyCertificateNow((CERTCertDBHandle *) CERT_GetDefaultCertDB(), server_cert,
+									   checksig, certificateUsageSSLServer,
+									   pin, NULL);
+
+	/*
+	 * If we've already failed validation then there is no point in also
+	 * performing the hostname check for verify-full.
+	 */
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to verify certificate: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		goto done;
+	}
+
+	if (strcmp(conn->sslmode, "verify-full") == 0)
+	{
+		server_hostname = SSL_RevealURL(conn->pr_fd);
+		if (!server_hostname || server_hostname[0] == '\0')
+			goto done;
+
+		/*
+		 * CERT_VerifyCertName will internally perform RFC 2818 SubjectAltName
+		 * verification.
+		 */
+		status = CERT_VerifyCertName(server_cert, server_hostname);
+		if (status != SECSuccess)
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("unable to verify server hostname: %s"),
+							  pg_SSLerrmessage(PR_GetError()));
+
+	}
+
+done:
+	if (server_hostname)
+		PR_Free(server_hostname);
+
+	CERT_DestroyCertificate(server_cert);
+	return status;
+}
+
+/*
+ * pg_client_auth_handler
+ *		Callback for client certificate validation
+ *
+ * The client auth callback is not on by default in NSS, so we need to invoke
+ * it ourselves to ensure we can do cert authentication. A TODO is to support
+ * running without a specified sslcert parameter. By retrieving all the certs
+ * via nickname from the cert database and see if we find one which apply with
+ * NSS_CmpCertChainWCANames() and PK11_FindKeyByAnyCert() we could support
+ * just running with a ssl database specified.
+ *
+ * For now, we use the default client certificate validation which requires a
+ * defined nickname to identify the cert in the database.
+ */
+static SECStatus
+pg_client_auth_handler(void *arg, PRFileDesc * socket, CERTDistNames * caNames,
+					   CERTCertificate * *pRetCert, SECKEYPrivateKey * *pRetKey)
+{
+	PGconn	   *conn = (PGconn *) arg;
+
+	return NSS_GetClientAuthData(conn->sslcert, socket, caNames, pRetCert, pRetKey);
+}
+
+/*
+ * pg_bad_cert_handler
+ *		Callback for failed certificate validation
+ *
+ * The TLS handshake will call this function iff the server certificate failed
+ * validation. Depending on the sslmode, we allow the connection anyways.
+ */
+static SECStatus
+pg_bad_cert_handler(void *arg, PRFileDesc * fd)
+{
+	PGconn	   *conn = (PGconn *) arg;
+	PRErrorCode err;
+
+	/*
+	 * This really shouldn't happen, as we've the the PGconn object as our
+	 * callback data, and at the callsite we know it will be populated. That
+	 * being said, the NSS code itself performs this check even when it should
+	 * not be required so let's use the same belts with our suspenders.
+	 */
+	if (!arg)
+		return SECFailure;
+
+	/*
+	 * For sslmodes other than verify-full and verify-ca we don't perform peer
+	 * validation, so return immediately.  sslmode require with a database
+	 * specified which contains a CA certificate will work like verify-ca to
+	 * be compatible with the OpenSSL implementation.
+	 */
+	if (strcmp(conn->sslmode, "require") == 0)
+	{
+		if (conn->cert_database && strlen(conn->cert_database) > 0 && cert_database_has_CA(conn))
+			return SECFailure;
+	}
+	if (conn->sslmode[0] == 'v')
+		return SECFailure;
+
+	err = PORT_GetError();
+
+	/*
+	 * TODO: these are relevant error codes that can occur in certificate
+	 * validation, figure out which we dont want for require/prefer etc.
+	 */
+	switch (err)
+	{
+		case SEC_ERROR_INVALID_AVA:
+		case SEC_ERROR_INVALID_TIME:
+		case SEC_ERROR_BAD_SIGNATURE:
+		case SEC_ERROR_EXPIRED_CERTIFICATE:
+		case SEC_ERROR_UNKNOWN_ISSUER:
+		case SEC_ERROR_UNTRUSTED_ISSUER:
+		case SEC_ERROR_UNTRUSTED_CERT:
+		case SEC_ERROR_CERT_VALID:
+		case SEC_ERROR_EXPIRED_ISSUER_CERTIFICATE:
+		case SEC_ERROR_CRL_EXPIRED:
+		case SEC_ERROR_CRL_BAD_SIGNATURE:
+		case SEC_ERROR_EXTENSION_VALUE_INVALID:
+		case SEC_ERROR_CA_CERT_INVALID:
+		case SEC_ERROR_CERT_USAGES_INVALID:
+		case SEC_ERROR_UNKNOWN_CRITICAL_EXTENSION:
+			return SECSuccess;
+			break;
+		default:
+			return SECFailure;
+			break;
+	}
+
+	/* Unreachable */
+	return SECSuccess;
+}
+
+/* ------------------------------------------------------------ */
+/*					SSL information functions					*/
+/* ------------------------------------------------------------ */
+
+void *
+PQgetssl(PGconn *conn)
+{
+	/*
+	 * Always return NULL as this is legacy and defined to be equal to
+	 * PQsslStruct(conn, "OpenSSL"); This should ideally trigger a logged
+	 * warning somewhere as it's nonsensical to run in a non-OpenSSL build,
+	 * but the color of said bikeshed hasn't yet been determined.
+	 */
+	return NULL;
+}
+
+void *
+PQsslStruct(PGconn *conn, const char *struct_name)
+{
+	if (!conn)
+		return NULL;
+
+	/*
+	 * Return the underlying PRFileDesc which can be used to access
+	 * information on the connection details. There is no SSL context per se.
+	 */
+	if (strcmp(struct_name, "NSS") == 0)
+		return conn->pr_fd;
+	return NULL;
+}
+
+const char *const *
+PQsslAttributeNames(PGconn *conn)
+{
+	static const char *const result[] = {
+		"library",
+		"cipher",
+		"protocol",
+		"key_bits",
+		"compression",
+		NULL
+	};
+
+	return result;
+}
+
+const char *
+PQsslAttribute(PGconn *conn, const char *attribute_name)
+{
+	SECStatus	status;
+	SSLChannelInfo channel;
+	SSLCipherSuiteInfo suite;
+
+	if (!conn || !conn->pr_fd)
+		return NULL;
+
+	if (strcmp(attribute_name, "library") == 0)
+		return "NSS";
+
+	status = SSL_GetChannelInfo(conn->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+		return NULL;
+
+	status = SSL_GetCipherSuiteInfo(channel.cipherSuite, &suite, sizeof(suite));
+	if (status != SECSuccess)
+		return NULL;
+
+	if (strcmp(attribute_name, "cipher") == 0)
+		return suite.cipherSuiteName;
+
+	if (strcmp(attribute_name, "key_bits") == 0)
+	{
+		static char key_bits_str[8];
+
+		snprintf(key_bits_str, sizeof(key_bits_str), "%i", suite.effectiveKeyBits);
+		return key_bits_str;
+	}
+
+	if (strcmp(attribute_name, "protocol") == 0)
+	{
+		switch (channel.protocolVersion)
+		{
+#ifdef SSL_LIBRARY_VERSION_TLS_1_3
+			case SSL_LIBRARY_VERSION_TLS_1_3:
+				return "TLSv1.3";
+#endif
+#ifdef SSL_LIBRARY_VERSION_TLS_1_2
+			case SSL_LIBRARY_VERSION_TLS_1_2:
+				return "TLSv1.2";
+#endif
+#ifdef SSL_LIBRARY_VERSION_TLS_1_1
+			case SSL_LIBRARY_VERSION_TLS_1_1:
+				return "TLSv1.1";
+#endif
+			case SSL_LIBRARY_VERSION_TLS_1_0:
+				return "TLSv1.0";
+			default:
+				return "unknown";
+		}
+	}
+
+	/*
+	 * NSS disabled support for compression in version 3.33, and it was only
+	 * available for SSLv3 at that point anyways, so we can safely return off
+	 * here without checking.
+	 */
+	if (strcmp(attribute_name, "compression") == 0)
+		return "off";
+
+	return NULL;
+}
+
+static int
+ssl_protocol_version_to_nss(const char *protocol)
+{
+	if (pg_strcasecmp("TLSv1", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_0;
+
+#ifdef SSL_LIBRARY_VERSION_TLS_1_1
+	if (pg_strcasecmp("TLSv1.1", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_1;
+#endif
+
+#ifdef SSL_LIBRARY_VERSION_TLS_1_2
+	if (pg_strcasecmp("TLSv1.2", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_2;
+#endif
+
+#ifdef SSL_LIBRARY_VERSION_TLS_1_3
+	if (pg_strcasecmp("TLSv1.3", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_3;
+#endif
+
+	return -1;
+}
+
+static bool
+cert_database_has_CA(PGconn *conn)
+{
+	CERTCertList *certificates;
+	bool		hasCA;
+
+	/*
+	 * If the certificate database has a password we must provide it, since
+	 * this API doesn't invoke the standard password callback.
+	 */
+	if (has_password)
+		certificates = PK11_ListCerts(PK11CertListCA, PQssl_passwd_cb(NULL, PR_FALSE, (void *) conn));
+	else
+		certificates = PK11_ListCerts(PK11CertListCA, NULL);
+	hasCA = !CERT_LIST_EMPTY(certificates);
+	CERT_DestroyCertList(certificates);
+
+	return hasCA;
+}
+
+PQsslKeyPassHook_nss_type
+PQgetSSLKeyPassHook_nss(void)
+{
+	return PQsslKeyPassHook;
+}
+
+void
+PQsetSSLKeyPassHook_nss(PQsslKeyPassHook_nss_type hook)
+{
+	PQsslKeyPassHook = hook;
+}
+
+/*
+ * Supply a password to decrypt a client certificate.
+ *
+ * This must match NSS type PK11PasswordFunc.
+ */
+static char *
+PQssl_passwd_cb(PK11SlotInfo * slot, PRBool retry, void *arg)
+{
+	has_password = true;
+
+	if (PQsslKeyPassHook)
+		return PQsslKeyPassHook(slot, (PRBool) retry, arg);
+	else
+		return PQdefaultSSLKeyPassHook_nss(slot, retry, arg);
+}
+
+/*
+ * The default password handler callback.
+ */
+char *
+PQdefaultSSLKeyPassHook_nss(PK11SlotInfo * slot, PRBool retry, void *arg)
+{
+	PGconn	   *conn = (PGconn *) arg;
+
+	/*
+	 * If the password didn't work the first time there is no point in
+	 * retrying as it hasn't changed.
+	 */
+	if (retry != PR_TRUE && conn->sslpassword && strlen(conn->sslpassword) > 0)
+		return PORT_Strdup(conn->sslpassword);
+
+	return NULL;
+}
diff --git a/src/interfaces/libpq/fe-secure.c b/src/interfaces/libpq/fe-secure.c
index 3311fd7a5b..b6c92ece11 100644
--- a/src/interfaces/libpq/fe-secure.c
+++ b/src/interfaces/libpq/fe-secure.c
@@ -430,6 +430,9 @@ PQsslAttributeNames(PGconn *conn)
 
 	return result;
 }
+#endif /* USE_SSL */
+
+#ifndef USE_OPENSSL
 
 PQsslKeyPassHook_OpenSSL_type
 PQgetSSLKeyPassHook_OpenSSL(void)
@@ -448,7 +451,7 @@ PQdefaultSSLKeyPassHook_OpenSSL(char *buf, int size, PGconn *conn)
 {
 	return 0;
 }
-#endif							/* USE_SSL */
+#endif							/* USE_OPENSSL */
 
 /* Dummy version of GSSAPI information functions, when built without GSS support */
 #ifndef ENABLE_GSS
diff --git a/src/interfaces/libpq/libpq-fe.h b/src/interfaces/libpq/libpq-fe.h
index 3b6a9fbce3..27c16e187f 100644
--- a/src/interfaces/libpq/libpq-fe.h
+++ b/src/interfaces/libpq/libpq-fe.h
@@ -625,6 +625,17 @@ extern PQsslKeyPassHook_OpenSSL_type PQgetSSLKeyPassHook_OpenSSL(void);
 extern void PQsetSSLKeyPassHook_OpenSSL(PQsslKeyPassHook_OpenSSL_type hook);
 extern int	PQdefaultSSLKeyPassHook_OpenSSL(char *buf, int size, PGconn *conn);
 
+/* == in fe-secure-nss.c === */
+typedef struct PK11SlotInfoStr PK11SlotInfo;
+typedef int PRIntn;
+typedef PRIntn PRBool;
+
+/* Support for overriding sslpassword handling with a callback. */
+typedef char *(*PQsslKeyPassHook_nss_type) (PK11SlotInfo * slot, PRBool retry, void *arg);
+extern PQsslKeyPassHook_nss_type PQgetSSLKeyPassHook_nss(void);
+extern void PQsetSSLKeyPassHook_nss(PQsslKeyPassHook_nss_type hook);
+extern char *PQdefaultSSLKeyPassHook_nss(PK11SlotInfo * slot, PRBool retry, void *arg);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/src/interfaces/libpq/libpq-int.h b/src/interfaces/libpq/libpq-int.h
index 1de91ae295..12717ca720 100644
--- a/src/interfaces/libpq/libpq-int.h
+++ b/src/interfaces/libpq/libpq-int.h
@@ -362,6 +362,7 @@ struct pg_conn
 	char	   *sslpassword;	/* client key file password */
 	char	   *sslrootcert;	/* root certificate filename */
 	char	   *sslcrl;			/* certificate revocation list filename */
+	char	   *cert_database;
 	char	   *requirepeer;	/* required peer credentials for local sockets */
 	char	   *gssencmode;		/* GSS mode (require,prefer,disable) */
 	char	   *krbsrvname;		/* Kerberos service name */
@@ -485,6 +486,10 @@ struct pg_conn
 								 * OpenSSL version changes */
 #endif
 #endif							/* USE_OPENSSL */
+
+#ifdef USE_NSS
+	void	   *pr_fd;
+#endif							/* USE_NSS */
 #endif							/* USE_SSL */
 
 #ifdef ENABLE_GSS
diff --git a/src/test/Makefile b/src/test/Makefile
index efb206aa75..d18f5a083b 100644
--- a/src/test/Makefile
+++ b/src/test/Makefile
@@ -27,7 +27,7 @@ ifneq (,$(filter ldap,$(PG_TEST_EXTRA)))
 SUBDIRS += ldap
 endif
 endif
-ifeq ($(with_openssl),yes)
+ifeq ($(with_ssl),yes)
 ifneq (,$(filter ssl,$(PG_TEST_EXTRA)))
 SUBDIRS += ssl
 endif
diff --git a/src/test/ssl/Makefile b/src/test/ssl/Makefile
index 777ee39413..fe265e2dbd 100644
--- a/src/test/ssl/Makefile
+++ b/src/test/ssl/Makefile
@@ -14,6 +14,7 @@ top_builddir = ../../..
 include $(top_builddir)/src/Makefile.global
 
 export with_openssl
+export with_nss
 
 CERTIFICATES := server_ca server-cn-and-alt-names \
 	server-cn-only server-single-alt-name server-multiple-alt-names \
@@ -30,6 +31,32 @@ SSLFILES := $(CERTIFICATES:%=ssl/%.key) $(CERTIFICATES:%=ssl/%.crt) \
 	ssl/client+client_ca.crt ssl/client-der.key \
 	ssl/client-encrypted-pem.key ssl/client-encrypted-der.key
 
+# Even though we in practice could get away with far fewer NSS databases, they
+# are generated to mimick the setup for the OpenSSL tests in order to ensure
+# we isolate the same behavior between the backends. The database name should
+# contain the files included for easier test suite code reading.
+NSSFILES := ssl/nss/client_ca.crt.db \
+	ssl/nss/server_ca.crt.db \
+	ssl/nss/root+server_ca.crt.db \
+	ssl/nss/root+client_ca.crt.db \
+	ssl/nss/client.crt__client.key.db \
+	ssl/nss/client-revoked.crt__client-revoked.key.db \
+	ssl/nss/server-cn-only.crt__server-password.key.db \
+	ssl/nss/server-cn-only.crt__server-cn-only.key.db \
+	ssl/nss/root.crl \
+	ssl/nss/server.crl \
+	ssl/nss/client.crl \
+	ssl/nss/server-multiple-alt-names.crt__server-multiple-alt-names.key.db \
+	ssl/nss/server-single-alt-name.crt__server-single-alt-name.key.db \
+	ssl/nss/server-cn-and-alt-names.crt__server-cn-and-alt-names.key.db \
+	ssl/nss/server-no-names.crt__server-no-names.key.db \
+	ssl/nss/server-revoked.crt__server-revoked.key.db \
+	ssl/nss/root+client.crl \
+	ssl/nss/client+client_ca.crt__client.key.db \
+	ssl/nss/client.crt__client-encrypted-pem.key.db \
+	ssl/nss/root+server_ca.crt__server.crl.db \
+	ssl/nss/root+server_ca.crt__root+server.crl.db
+
 # This target re-generates all the key and certificate files. Usually we just
 # use the ones that are committed to the tree without rebuilding them.
 #
@@ -37,6 +64,10 @@ SSLFILES := $(CERTIFICATES:%=ssl/%.key) $(CERTIFICATES:%=ssl/%.crt) \
 #
 sslfiles: $(SSLFILES)
 
+# Generate NSS certificate databases corresponding to the OpenSSL certificates.
+# This target will fail unless preceded by nssfiles-clean.
+nssfiles: $(NSSFILES)
+
 # OpenSSL requires a directory to put all generated certificates in. We don't
 # use this for anything, but we need a location.
 ssl/new_certs_dir:
@@ -64,6 +95,24 @@ ssl/%_ca.crt: ssl/%_ca.key %_ca.config ssl/root_ca.crt ssl/new_certs_dir
 	rm ssl/temp_ca.crt ssl/temp_ca_signed.crt
 	echo "01" > ssl/$*_ca.srl
 
+ssl/nss/%_ca.crt.db: ssl/%_ca.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n $*_ca.crt -i ssl/$*_ca.crt -t "CT,C,C"
+
+ssl/nss/root+server_ca.crt__server.crl.db: ssl/root+server_ca.crt ssl/nss/server.crl
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	crlutil -I -i ssl/nss/server.crl -d $@ -B
+
+ssl/nss/root+server_ca.crt__root+server.crl.db: ssl/root+server_ca.crt ssl/nss/root.crl ssl/nss/server.crl
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	crlutil -I -i ssl/nss/root.crl -d $@ -B
+	crlutil -I -i ssl/nss/server.crl -d $@ -B
+
 # Server certificates, signed by server CA:
 ssl/server-%.crt: ssl/server-%.key ssl/server_ca.crt server-%.config
 	openssl req -new -key ssl/server-$*.key -out ssl/server-$*.csr -config server-$*.config
@@ -77,6 +126,74 @@ ssl/server-ss.crt: ssl/server-cn-only.key ssl/server-cn-only.crt server-cn-only.
 	openssl x509 -req -days 10000 -in ssl/server-ss.csr -signkey ssl/server-cn-only.key -out ssl/server-ss.crt  -extensions v3_req -extfile server-cn-only.config
 	rm ssl/server-ss.csr
 
+ssl/nss/server-cn-only.crt__server-password.key.db: ssl/server-cn-only.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-cn-only.crt -i ssl/server-cn-only.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-password.pfx -inkey ssl/server-password.key -in ssl/server-cn-only.crt -certfile ssl/server_ca.crt -passin 'pass:secret1' -passout pass:
+	pk12util -i ssl/nss/server-password.pfx -d $@ -W ''
+
+ssl/nss/server-cn-only.crt__server-cn-only.key.db: ssl/server-cn-only.crt ssl/server-cn-only.key
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-cn-only.crt -i ssl/server-cn-only.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-cn-only.pfx -inkey ssl/server-cn-only.key -in ssl/server-cn-only.crt -certfile ssl/server_ca.crt -passout pass:
+	pk12util -i ssl/nss/server-cn-only.pfx -d $@ -W ''
+
+ssl/nss/server-multiple-alt-names.crt__server-multiple-alt-names.key.db: ssl/server-multiple-alt-names.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-multiple-alt-names.crt -i ssl/server-multiple-alt-names.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-multiple-alt-names.pfx -inkey ssl/server-multiple-alt-names.key -in ssl/server-multiple-alt-names.crt -certfile ssl/server-multiple-alt-names.crt -passout pass:
+	pk12util -i ssl/nss/server-multiple-alt-names.pfx -d $@ -W ''
+
+ssl/nss/server-single-alt-name.crt__server-single-alt-name.key.db: ssl/server-single-alt-name.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-single-alt-name.crt -i ssl/server-single-alt-name.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-single-alt-name.pfx -inkey ssl/server-single-alt-name.key -in ssl/server-single-alt-name.crt -certfile ssl/server-single-alt-name.crt -passout pass:
+	pk12util -i ssl/nss/server-single-alt-name.pfx -d $@ -W ''
+
+ssl/nss/server-cn-and-alt-names.crt__server-cn-and-alt-names.key.db: ssl/server-cn-and-alt-names.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-cn-and-alt-names.crt -i ssl/server-cn-and-alt-names.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-cn-and-alt-names.pfx -inkey ssl/server-cn-and-alt-names.key -in ssl/server-cn-and-alt-names.crt -certfile ssl/server-cn-and-alt-names.crt -passout pass:
+	pk12util -i ssl/nss/server-cn-and-alt-names.pfx -d $@ -W ''
+
+ssl/nss/server-no-names.crt__server-no-names.key.db: ssl/server-no-names.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-no-names.crt -i ssl/server-no-names.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-no-names.pfx -inkey ssl/server-no-names.key -in ssl/server-no-names.crt -certfile ssl/server-no-names.crt -passout pass:
+	pk12util -i ssl/nss/server-no-names.pfx -d $@ -W ''
+
+ssl/nss/server-revoked.crt__server-revoked.key.db: ssl/server-revoked.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-revoked.crt -i ssl/server-revoked.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-revoked.pfx -inkey ssl/server-revoked.key -in ssl/server-revoked.crt -certfile ssl/server-revoked.crt -passout pass:
+	pk12util -i ssl/nss/server-revoked.pfx -d $@ -W ''
+
 # Password-protected version of server-cn-only.key
 ssl/server-password.key: ssl/server-cn-only.key
 	openssl rsa -aes256 -in $< -out $@ -passout 'pass:secret1'
@@ -88,6 +205,27 @@ ssl/client.crt: ssl/client.key ssl/client_ca.crt
 	openssl x509 -in ssl/temp.crt -out ssl/client.crt # to keep just the PEM cert
 	rm ssl/client.csr ssl/temp.crt
 
+# Client certificate, signed by client CA
+ssl/nss/client.crt__client.key.db: ssl/client.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/client.crt -i ssl/client.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root+client_ca.crt -i ssl/root+client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client.pfx -inkey ssl/client.key -in ssl/client.crt -certfile ssl/client_ca.crt -passout pass:
+	pk12util -i ssl/nss/client.pfx -d $@ -W ''
+
+# Client certificate with encrypted key, signed by client CA
+ssl/nss/client.crt__client-encrypted-pem.key.db: ssl/client.crt
+	$(MKDIR_P) $@
+	echo 'dUmmyP^#+' > $@.pass
+	certutil -d "sql:$@" -N -f $@.pass
+	certutil -d "sql:$@" -A -f $@.pass -n ssl/client.crt -i ssl/client.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -f $@.pass -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -f $@.pass -n root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client-encrypted-pem.pfx -inkey ssl/client-encrypted-pem.key -in ssl/client.crt -certfile ssl/client_ca.crt -passin pass:'dUmmyP^#+' -passout pass:'dUmmyP^#+'
+	pk12util -i ssl/nss/client-encrypted-pem.pfx -d $@ -W 'dUmmyP^#+' -k $@.pass
+
 # Another client certificate, signed by the client CA. This one is revoked.
 ssl/client-revoked.crt: ssl/client-revoked.key ssl/client_ca.crt client.config
 	openssl req -new -key ssl/client-revoked.key -out ssl/client-revoked.csr -config client.config
@@ -95,6 +233,14 @@ ssl/client-revoked.crt: ssl/client-revoked.key ssl/client_ca.crt client.config
 	openssl x509 -in ssl/temp.crt -out ssl/client-revoked.crt # to keep just the PEM cert
 	rm ssl/client-revoked.csr ssl/temp.crt
 
+ssl/nss/client-revoked.crt__client-revoked.key.db: ssl/client-revoked.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/client-revoked.crt -i ssl/client-revoked.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client-revoked.pfx -inkey ssl/client-revoked.key -in ssl/client-revoked.crt -certfile ssl/client_ca.crt -passout pass:
+	pk12util -i ssl/nss/client-revoked.pfx -d $@ -W ''
+
 # Convert the key to DER, to test our behaviour there too
 ssl/client-der.key: ssl/client.key
 	openssl rsa -in ssl/client.key -outform DER -out ssl/client-der.key
@@ -127,19 +273,40 @@ ssl/root+client_ca.crt: ssl/root_ca.crt ssl/client_ca.crt
 ssl/client+client_ca.crt: ssl/client.crt ssl/client_ca.crt
 	cat $^ > $@
 
+# Client certificate, signed by client CA
+ssl/nss/client+client_ca.crt__client.key.db: ssl/client+client_ca.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/client+client_ca.crt -i ssl/client+client_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n ssl/root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client.pfx -inkey ssl/client.key -in ssl/client.crt -certfile ssl/client_ca.crt -passout pass:
+	pk12util -i ssl/nss/client.pfx -d $@ -W ''
+
 #### CRLs
 
 ssl/client.crl: ssl/client-revoked.crt
 	openssl ca -config cas.config -name client_ca -revoke ssl/client-revoked.crt
 	openssl ca -config cas.config -name client_ca -gencrl -out ssl/client.crl
 
+ssl/nss/client.crl: ssl/client.crl
+	openssl crl -in $^ -outform der -out $@
+
 ssl/server.crl: ssl/server-revoked.crt
 	openssl ca -config cas.config -name server_ca -revoke ssl/server-revoked.crt
 	openssl ca -config cas.config -name server_ca -gencrl -out ssl/server.crl
 
+ssl/nss/server.crl: ssl/server.crl
+	openssl crl -in $^ -outform der -out $@
+
 ssl/root.crl: ssl/root_ca.crt
 	openssl ca -config cas.config -name root_ca -gencrl -out ssl/root.crl
 
+ssl/nss/root.crl: ssl/root.crl
+	openssl crl -in $^ -outform der -out $@
+
+ssl/nss/root+client.crl: ssl/root+client.crl
+	openssl crl -in $^ -outform der -out $@
+
 # If a CRL is used, OpenSSL requires a CRL file for *all* the CAs in the
 # chain, even if some of them are empty.
 ssl/root+server.crl: ssl/root.crl ssl/server.crl
@@ -151,9 +318,14 @@ ssl/root+client.crl: ssl/root.crl ssl/client.crl
 sslfiles-clean:
 	rm -f $(SSLFILES) ssl/client_ca.srl ssl/server_ca.srl ssl/client_ca-certindex* ssl/server_ca-certindex* ssl/root_ca-certindex* ssl/root_ca.srl ssl/temp_ca.crt ssl/temp_ca_signed.crt
 
+.PHONY: nssfiles-clean
+nssfiles-clean:
+	rm -rf ssl/nss
+
 clean distclean maintainer-clean:
 	rm -rf tmp_check
 	rm -rf ssl/*.old ssl/new_certs_dir ssl/client*_tmp.key
+	rm -rf ssl/nss
 
 # Doesn't depend on $(SSLFILES) because we don't rebuild them by default
 check:
diff --git a/src/test/ssl/t/001_ssltests.pl b/src/test/ssl/t/001_ssltests.pl
index fd2727b568..c27313f86d 100644
--- a/src/test/ssl/t/001_ssltests.pl
+++ b/src/test/ssl/t/001_ssltests.pl
@@ -4,15 +4,22 @@ use PostgresNode;
 use TestLib;
 use Test::More;
 
-use File::Copy;
-
 use FindBin;
 use lib $FindBin::RealBin;
 
-use SSLServer;
+use SSL::Server;
+
+my $openssl;
+my $nss;
 
 if ($ENV{with_openssl} eq 'yes')
 {
+	$openssl = 1;
+	plan tests => 93;
+}
+elsif ($ENV{with_nss} eq 'yes')
+{
+	$nss = 1;
 	plan tests => 93;
 }
 else
@@ -32,32 +39,6 @@ my $SERVERHOSTCIDR = '127.0.0.1/32';
 # Allocation of base connection string shared among multiple tests.
 my $common_connstr;
 
-# The client's private key must not be world-readable, so take a copy
-# of the key stored in the code tree and update its permissions.
-#
-# This changes ssl/client.key to ssl/client_tmp.key etc for the rest
-# of the tests.
-my @keys = (
-	"client",     "client-revoked",
-	"client-der", "client-encrypted-pem",
-	"client-encrypted-der");
-foreach my $key (@keys)
-{
-	copy("ssl/${key}.key", "ssl/${key}_tmp.key")
-	  or die
-	  "couldn't copy ssl/${key}.key to ssl/${key}_tmp.key for permissions change: $!";
-	chmod 0600, "ssl/${key}_tmp.key"
-	  or die "failed to change permissions on ssl/${key}_tmp.key: $!";
-}
-
-# Also make a copy of that explicitly world-readable.  We can't
-# necessarily rely on the file in the source tree having those
-# permissions.  Add it to @keys to include it in the final clean
-# up phase.
-copy("ssl/client.key", "ssl/client_wrongperms_tmp.key");
-chmod 0644, "ssl/client_wrongperms_tmp.key";
-push @keys, 'client_wrongperms';
-
 #### Set up the server.
 
 note "setting up data directory";
@@ -72,32 +53,28 @@ $node->start;
 
 # Run this before we lock down access below.
 my $result = $node->safe_psql('postgres', "SHOW ssl_library");
-is($result, 'OpenSSL', 'ssl_library parameter');
+is($result, SSL::Server::ssl_library(), 'ssl_library parameter');
 
 configure_test_server_for_ssl($node, $SERVERHOSTADDR, $SERVERHOSTCIDR,
 	'trust');
 
 note "testing password-protected keys";
 
-open my $sslconf, '>', $node->data_dir . "/sslconfig.conf";
-print $sslconf "ssl=on\n";
-print $sslconf "ssl_cert_file='server-cn-only.crt'\n";
-print $sslconf "ssl_key_file='server-password.key'\n";
-print $sslconf "ssl_passphrase_command='echo wrongpassword'\n";
-close $sslconf;
-
-command_fails(
-	[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
-	'restart fails with password-protected key file with wrong password');
-$node->_update_pid(0);
-
-open $sslconf, '>', $node->data_dir . "/sslconfig.conf";
-print $sslconf "ssl=on\n";
-print $sslconf "ssl_cert_file='server-cn-only.crt'\n";
-print $sslconf "ssl_key_file='server-password.key'\n";
-print $sslconf "ssl_passphrase_command='echo secret1'\n";
-close $sslconf;
+SKIP:
+{
+	skip "Certificate passphrases aren't checked on server restart in NSS", 1
+	  if ($nss);
+
+	switch_server_cert($node, 'server-cn-only', 'root+client_ca',
+		'server-password', 'echo wrongpassword');
+	command_fails(
+		[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
+		'restart fails with password-protected key file with wrong password');
+	$node->_update_pid(0);
+}
 
+switch_server_cert($node, 'server-cn-only', 'root+client_ca',
+	'server-password', 'echo secret1');
 command_ok(
 	[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
 	'restart succeeds with password-protected key file');
@@ -149,82 +126,105 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"sslrootcert=invalid sslmode=verify-ca",
-	qr/root certificate file "invalid" does not exist/,
+	qr/root certificate file "invalid" does not exist|could not connect to server/,
 	"connect without server root cert sslmode=verify-ca");
 test_connect_fails(
 	$common_connstr,
 	"sslrootcert=invalid sslmode=verify-full",
-	qr/root certificate file "invalid" does not exist/,
+	qr/root certificate file "invalid" does not exist|could not connect to server/,
 	"connect without server root cert sslmode=verify-full");
 
 # Try with wrong root cert, should fail. (We're using the client CA as the
 # root, but the server's key is signed by the server CA.)
-test_connect_fails($common_connstr,
-	"sslrootcert=ssl/client_ca.crt sslmode=require",
-	qr/SSL error/, "connect with wrong server root cert sslmode=require");
-test_connect_fails($common_connstr,
-	"sslrootcert=ssl/client_ca.crt sslmode=verify-ca",
-	qr/SSL error/, "connect with wrong server root cert sslmode=verify-ca");
-test_connect_fails($common_connstr,
-	"sslrootcert=ssl/client_ca.crt sslmode=verify-full",
-	qr/SSL error/, "connect with wrong server root cert sslmode=verify-full");
-
-# Try with just the server CA's cert. This fails because the root file
-# must contain the whole chain up to the root CA.
-test_connect_fails($common_connstr,
-	"sslrootcert=ssl/server_ca.crt sslmode=verify-ca",
-	qr/SSL error/, "connect with server CA cert, without root CA");
+test_connect_fails(
+	$common_connstr,
+	"sslrootcert=ssl/client_ca.crt sslmode=require cert_database=ssl/nss/client_ca.crt.db",
+	qr/SSL error/,
+	"connect with wrong server root cert sslmode=require");
+test_connect_fails(
+	$common_connstr,
+	"sslrootcert=ssl/client_ca.crt sslmode=verify-ca cert_database=ssl/nss/client_ca.crt.db",
+	qr/SSL error/,
+	"connect with wrong server root cert sslmode=verify-ca");
+test_connect_fails(
+	$common_connstr,
+	"sslrootcert=ssl/client_ca.crt sslmode=verify-full cert_database=ssl/nss/client_ca.crt.db",
+	qr/SSL error/,
+	"connect with wrong server root cert sslmode=verify-full");
+
+SKIP:
+{
+	# NSS supports partial chain validation, so this test doesnt work there.
+	# This is similar to the OpenSSL option X509_V_FLAG_PARTIAL_CHAIN which
+	# we don't allow.
+	skip "NSS support partial chain validation", 2 if ($nss);
+	# Try with just the server CA's cert. This fails because the root file
+	# must contain the whole chain up to the root CA.
+	test_connect_fails($common_connstr,
+		"sslrootcert=ssl/server_ca.crt sslmode=verify-ca",
+		qr/SSL error/, "connect with server CA cert, without root CA");
+}
 
 # And finally, with the correct root cert.
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require cert_database=ssl/nss/root+server_ca.crt.db",
 	"connect with correct server CA cert file sslmode=require");
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca cert_database=ssl/nss/root+server_ca.crt.db",
 	"connect with correct server CA cert file sslmode=verify-ca");
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-full",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db",
 	"connect with correct server CA cert file sslmode=verify-full");
 
-# Test with cert root file that contains two certificates. The client should
-# be able to pick the right one, regardless of the order in the file.
-test_connect_ok(
-	$common_connstr,
-	"sslrootcert=ssl/both-cas-1.crt sslmode=verify-ca",
-	"cert root file that contains two certificates, order 1");
-test_connect_ok(
-	$common_connstr,
-	"sslrootcert=ssl/both-cas-2.crt sslmode=verify-ca",
-	"cert root file that contains two certificates, order 2");
+SKIP:
+{
+	skip "CA ordering is irrelevant in NSS databases", 2 if ($nss);
+
+	# Test with cert root file that contains two certificates. The client should
+	# be able to pick the right one, regardless of the order in the file.
+	test_connect_ok(
+		$common_connstr,
+		"sslrootcert=ssl/both-cas-1.crt sslmode=verify-ca",
+		"cert root file that contains two certificates, order 1");
 
+	# How about import the both-file into a database?
+	test_connect_ok(
+		$common_connstr,
+		"sslrootcert=ssl/both-cas-2.crt sslmode=verify-ca",
+		"cert root file that contains two certificates, order 2");
+}
 # CRL tests
 
 # Invalid CRL filename is the same as no CRL, succeeds
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=invalid",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=invalid cert_database=ssl/nss/root+server_ca.crt.db",
 	"sslcrl option with invalid file name");
 
-# A CRL belonging to a different CA is not accepted, fails
-test_connect_fails(
-	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/client.crl",
-	qr/SSL error/,
-	"CRL belonging to a different CA");
+SKIP:
+{
+	skip "CRL's are verified when adding to NSS database", 2 if ($nss);
+	# A CRL belonging to a different CA is not accepted, fails
+	test_connect_fails(
+		$common_connstr,
+		"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/client.crl",
+		qr/SSL error/,
+		"CRL belonging to a different CA");
+}
 
 # With the correct CRL, succeeds (this cert is not revoked)
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/root+server.crl",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/root+server.crl cert_database=ssl/nss/root+server_ca.crt__root+server.crl.db",
 	"CRL with a non-revoked cert");
 
 # Check that connecting with verify-full fails, when the hostname doesn't
 # match the hostname in the server's certificate.
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -237,14 +237,14 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"sslmode=verify-full host=wronghost.test",
-	qr/\Qserver certificate for "common-name.pg-ssltest.test" does not match host name "wronghost.test"\E/,
+	qr/\Qserver certificate for "common-name.pg-ssltest.test" does not match host name "wronghost.test"\E|SSL_ERROR_BAD_CERT_DOMAIN/,
 	"mismatch between host name and server certificate sslmode=verify-full");
 
 # Test Subject Alternative Names.
 switch_server_cert($node, 'server-multiple-alt-names');
 
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -262,12 +262,12 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"host=wronghost.alt-name.pg-ssltest.test",
-	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "wronghost.alt-name.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "wronghost.alt-name.pg-ssltest.test"\E|SSL_ERROR_BAD_CERT_DOMAIN/,
 	"host name not matching with X.509 Subject Alternative Names");
 test_connect_fails(
 	$common_connstr,
 	"host=deep.subdomain.wildcard.pg-ssltest.test",
-	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E|SSL_ERROR_BAD_CERT_DOMAIN/,
 	"host name not matching with X.509 Subject Alternative Names wildcard");
 
 # Test certificate with a single Subject Alternative Name. (this gives a
@@ -275,7 +275,7 @@ test_connect_fails(
 switch_server_cert($node, 'server-single-alt-name');
 
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -285,12 +285,12 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"host=wronghost.alt-name.pg-ssltest.test",
-	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "wronghost.alt-name.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "wronghost.alt-name.pg-ssltest.test"\E|SSL_ERROR_BAD_CERT_DOMAIN/,
 	"host name not matching with a single X.509 Subject Alternative Name");
 test_connect_fails(
 	$common_connstr,
 	"host=deep.subdomain.wildcard.pg-ssltest.test",
-	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E|SSL_ERROR_BAD_CERT_DOMAIN/,
 	"host name not matching with a single X.509 Subject Alternative Name wildcard"
 );
 
@@ -299,7 +299,7 @@ test_connect_fails(
 switch_server_cert($node, 'server-cn-and-alt-names');
 
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -312,14 +312,14 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"host=common-name.pg-ssltest.test",
-	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 1 other name) does not match host name "common-name.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 1 other name) does not match host name "common-name.pg-ssltest.test"\E|SSL_ERROR_BAD_CERT_DOMAIN/,
 	"certificate with both a CN and SANs ignores CN");
 
 # Finally, test a server certificate that has no CN or SANs. Of course, that's
 # not a very sensible certificate, but libpq should handle it gracefully.
 switch_server_cert($node, 'server-no-names');
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -328,7 +328,7 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"sslmode=verify-full host=common-name.pg-ssltest.test",
-	qr/could not get server's host name from server certificate/,
+	qr/could not get server's host name from server certificate|SSL_ERROR_BAD_CERT_DOMAIN/,
 	"server certificate without CN or SANs sslmode=verify-full");
 
 # Test that the CRL works
@@ -340,11 +340,11 @@ $common_connstr =
 # Without the CRL, succeeds. With it, fails.
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca cert_database=ssl/nss/root+server_ca.crt.db",
 	"connects without client-side CRL");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/root+server.crl",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/server.crl cert_database=ssl/nss/root+server_ca.crt__server.crl.db",
 	qr/SSL error/,
 	"does not connect with client-side CRL");
 
@@ -365,21 +365,21 @@ command_like(
 # Test min/max SSL protocol versions.
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.2",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.2 cert_database=ssl/nss/root+server_ca.crt.db",
 	"connection success with correct range of TLS protocol versions");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.1",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.1 cert_database=ssl/nss/root+server_ca.crt.db",
 	qr/invalid SSL protocol version range/,
 	"connection failure with incorrect range of TLS protocol versions");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=incorrect_tls",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=incorrect_tls cert_database=ssl/nss/root+server_ca.crt.db",
 	qr/invalid ssl_min_protocol_version value/,
 	"connection failure with an incorrect SSL protocol minimum bound");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_max_protocol_version=incorrect_tls",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_max_protocol_version=incorrect_tls cert_database=ssl/nss/root+server_ca.crt.db",
 	qr/invalid ssl_max_protocol_version value/,
 	"connection failure with an incorrect SSL protocol maximum bound");
 
@@ -390,7 +390,7 @@ test_connect_fails(
 note "running server tests";
 
 $common_connstr =
-  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR";
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client.crt__client.key.db";
 
 # no client cert
 test_connect_fails(
@@ -406,32 +406,43 @@ test_connect_ok(
 	"certificate authorization succeeds with correct client cert in PEM format"
 );
 
-# correct client cert in unencrypted DER
-test_connect_ok(
-	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-der_tmp.key",
-	"certificate authorization succeeds with correct client cert in DER format"
-);
+$common_connstr =
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR";
+
+SKIP:
+{
+	skip "NSS database not implemented in the Makefile", 1 if ($nss);
+	# correct client cert in unencrypted DER
+	test_connect_ok(
+		$common_connstr,
+		"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-der_tmp.key",
+		"certificate authorization succeeds with correct client cert in DER format"
+	);
+}
 
 # correct client cert in encrypted PEM
 test_connect_ok(
 	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='dUmmyP^#+'",
+	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='dUmmyP^#+' cert_database=ssl/nss/client.crt__client-encrypted-pem.key.db",
 	"certificate authorization succeeds with correct client cert in encrypted PEM format"
 );
 
-# correct client cert in encrypted DER
-test_connect_ok(
-	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-der_tmp.key sslpassword='dUmmyP^#+'",
-	"certificate authorization succeeds with correct client cert in encrypted DER format"
-);
+SKIP:
+{
+	skip "NSS database not implemented in the Makefile", 1 if ($nss);
+	# correct client cert in encrypted DER
+	test_connect_ok(
+		$common_connstr,
+		"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-der_tmp.key sslpassword='dUmmyP^#+'",
+		"certificate authorization succeeds with correct client cert in encrypted DER format"
+	);
+}
 
 # correct client cert in encrypted PEM with wrong password
 test_connect_fails(
 	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='wrong'",
-	qr!\Qprivate key file "ssl/client-encrypted-pem_tmp.key": bad decrypt\E!,
+	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='wrong' cert_database=ssl/nss/client.crt__client-encrypted-pem.key.db",
+	qr!connection requires a valid client certificate|\Qprivate key file "ssl/client-encrypted-pem_tmp.key": bad decrypt\E!,
 	"certificate authorization fails with correct client cert and wrong password in encrypted PEM format"
 );
 
@@ -471,18 +482,19 @@ command_like(
 		'-P',
 		'null=_null_',
 		'-d',
-		"$common_connstr user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client_tmp.key",
+		"$common_connstr user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client_tmp.key cert_database=ssl/nss/client.crt__client.key.db",
 		'-c',
 		"SELECT * FROM pg_stat_ssl WHERE pid = pg_backend_pid()"
 	],
 	qr{^pid,ssl,version,cipher,bits,compression,client_dn,client_serial,issuer_dn\r?\n
-				^\d+,t,TLSv[\d.]+,[\w-]+,\d+,f,/CN=ssltestuser,1,\Q/CN=Test CA for PostgreSQL SSL regression test client certs\E\r?$}mx,
+				^\d+,t,TLSv[\d.]+,[\w-]+,\d+,f,/?CN=ssltestuser,1,/?\QCN=Test CA for PostgreSQL SSL regression test client certs\E\r?$}mx,
 	'pg_stat_ssl with client certificate');
 
 # client key with wrong permissions
 SKIP:
 {
 	skip "Permissions check not enforced on Windows", 2 if ($windows_os);
+	skip "Key not on filesystem with NSS",            2 if ($nss);
 
 	test_connect_fails(
 		$common_connstr,
@@ -495,10 +507,13 @@ SKIP:
 test_connect_fails(
 	$common_connstr,
 	"user=anotheruser sslcert=ssl/client.crt sslkey=ssl/client_tmp.key",
-	qr/certificate authentication failed for user "anotheruser"/,
+	qr/unable to verify certificate|certificate authentication failed for user "anotheruser"/,
 	"certificate authorization fails with client cert belonging to another user"
 );
 
+$common_connstr =
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client-revoked.crt__client-revoked.key.db";
+
 # revoked client cert
 test_connect_fails(
 	$common_connstr,
@@ -510,7 +525,7 @@ test_connect_fails(
 # works, iff username matches Common Name
 # fails, iff username doesn't match Common Name.
 $common_connstr =
-  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=verifydb hostaddr=$SERVERHOSTADDR";
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=verifydb hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client.crt__client.key.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -536,17 +551,18 @@ test_connect_ok(
 # intermediate client_ca.crt is provided by client, and isn't in server's ssl_ca_file
 switch_server_cert($node, 'server-cn-only', 'root_ca');
 $common_connstr =
-  "user=ssltestuser dbname=certdb sslkey=ssl/client_tmp.key sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR";
+  "user=ssltestuser dbname=certdb sslkey=ssl/client_tmp.key sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client+client_ca.crt__client.key.db";
 
 test_connect_ok(
 	$common_connstr,
 	"sslmode=require sslcert=ssl/client+client_ca.crt",
 	"intermediate client certificate is provided by client");
-test_connect_fails($common_connstr, "sslmode=require sslcert=ssl/client.crt",
-	qr/SSL error/, "intermediate client certificate is missing");
+test_connect_fails(
+	$common_connstr,
+	"sslmode=require sslcert=ssl/client.crt",
+	qr/connection requires a valid client certificate|SSL error/,
+	"intermediate client certificate is missing");
 
 # clean up
-foreach my $key (@keys)
-{
-	unlink("ssl/${key}_tmp.key");
-}
+
+SSL::Server::cleanup();
diff --git a/src/test/ssl/t/002_scram.pl b/src/test/ssl/t/002_scram.pl
index 01231f8ba0..4ea81fdbcf 100644
--- a/src/test/ssl/t/002_scram.pl
+++ b/src/test/ssl/t/002_scram.pl
@@ -11,11 +11,11 @@ use File::Copy;
 use FindBin;
 use lib $FindBin::RealBin;
 
-use SSLServer;
+use SSL::Server;
 
 if ($ENV{with_openssl} ne 'yes')
 {
-	plan skip_all => 'SSL not supported by this build';
+	plan skip_all => 'OpenSSL not supported by this build';
 }
 
 # This is the hostname used to connect to the server.
diff --git a/src/test/ssl/t/SSL/Backend/NSS.pm b/src/test/ssl/t/SSL/Backend/NSS.pm
new file mode 100644
index 0000000000..837f0d9891
--- /dev/null
+++ b/src/test/ssl/t/SSL/Backend/NSS.pm
@@ -0,0 +1,64 @@
+package SSL::Backend::NSS;
+
+use strict;
+use warnings;
+use Exporter;
+
+our @ISA       = qw(Exporter);
+our @EXPORT_OK = qw(get_new_nss_backend);
+
+sub new
+{
+	my ($class) = @_;
+
+	my $self = { _library => 'NSS' };
+
+	bless $self, $class;
+
+	return $self;
+}
+
+sub get_new_nss_backend
+{
+	my $class = 'SSL::Backend::NSS';
+
+	return $class->new();
+}
+
+sub init
+{
+	# Make sure the certificate databases are in place?
+}
+
+sub get_library
+{
+	my ($self) = @_;
+
+	return $self->{_library};
+}
+
+sub set_server_cert
+{
+	my $self     = $_[0];
+	my $certfile = $_[1];
+	my $cafile   = $_[2];
+	my $keyfile  = $_[3];
+
+	my $cert_nickname = $certfile . '.crt__' . $keyfile . '.key';
+	my $cert_database = $cert_nickname . '.db';
+
+	my $sslconf =
+	    "ssl_ca_file='$cafile.crt'\n"
+	  . "ssl_cert_file='ssl/$certfile.crt'\n"
+	  . "ssl_crl_file=''\n"
+	  . "ssl_database='nss/$cert_database'\n";
+
+	return $sslconf;
+}
+
+sub cleanup
+{
+	# Something?
+}
+
+1;
diff --git a/src/test/ssl/t/SSL/Backend/OpenSSL.pm b/src/test/ssl/t/SSL/Backend/OpenSSL.pm
new file mode 100644
index 0000000000..62b11b7632
--- /dev/null
+++ b/src/test/ssl/t/SSL/Backend/OpenSSL.pm
@@ -0,0 +1,103 @@
+package SSL::Backend::OpenSSL;
+
+use strict;
+use warnings;
+use Exporter;
+use File::Copy;
+
+our @ISA       = qw(Exporter);
+our @EXPORT_OK = qw(get_new_openssl_backend);
+
+our (@keys);
+
+INIT
+{
+	@keys = (
+		"client",     "client-revoked",
+		"client-der", "client-encrypted-pem",
+		"client-encrypted-der");
+}
+
+sub new
+{
+	my ($class) = @_;
+
+	my $self = { _library => 'OpenSSL' };
+
+	bless $self, $class;
+
+	return $self;
+}
+
+sub get_new_openssl_backend
+{
+	my $class = 'SSL::Backend::OpenSSL';
+
+	my $backend = $class->new();
+
+	return $backend;
+}
+
+sub init
+{
+	# The client's private key must not be world-readable, so take a copy
+	# of the key stored in the code tree and update its permissions.
+	#
+	# This changes ssl/client.key to ssl/client_tmp.key etc for the rest
+	# of the tests.
+	foreach my $key (@keys)
+	{
+		copy("ssl/${key}.key", "ssl/${key}_tmp.key")
+		  or die
+		  "couldn't copy ssl/${key}.key to ssl/${key}_tmp.key for permissions change: $!";
+		chmod 0600, "ssl/${key}_tmp.key"
+		  or die "failed to change permissions on ssl/${key}_tmp.key: $!";
+	}
+
+	# Also make a copy of that explicitly world-readable.  We can't
+	# necessarily rely on the file in the source tree having those
+	# permissions. Add it to @keys to include it in the final clean
+	# up phase.
+	copy("ssl/client.key", "ssl/client_wrongperms_tmp.key")
+	  or die
+	  "couldn't copy ssl/client.key to ssl/client_wrongperms_tmp.key: $!";
+	chmod 0644, "ssl/client_wrongperms_tmp.key"
+	  or die
+	  "failed to change permissions on ssl/client_wrongperms_tmp.key: $!";
+	push @keys, 'client_wrongperms';
+}
+
+# Change the configuration to use given server cert file, and reload
+# the server so that the configuration takes effect.
+sub set_server_cert
+{
+	my $self     = $_[0];
+	my $certfile = $_[1];
+	my $cafile   = $_[2] || "root+client_ca";
+	my $keyfile  = $_[3] || $certfile;
+
+	my $sslconf =
+	    "ssl_ca_file='$cafile.crt'\n"
+	  . "ssl_cert_file='$certfile.crt'\n"
+	  . "ssl_key_file='$keyfile.key'\n"
+	  . "ssl_crl_file='root+client.crl'\n";
+
+	return $sslconf;
+}
+
+sub get_library
+{
+	my ($self) = @_;
+
+	return $self->{_library};
+}
+
+sub cleanup
+{
+	foreach my $key (@keys)
+	{
+		unlink("ssl/${key}_tmp.key");
+	}
+}
+
+1;
diff --git a/src/test/ssl/t/SSLServer.pm b/src/test/ssl/t/SSLServer.pm
index 1e392b8fbf..f6b9711bcd 100644
--- a/src/test/ssl/t/SSLServer.pm
+++ b/src/test/ssl/t/SSLServer.pm
@@ -24,15 +24,34 @@
 # explicitly because an invalid sslcert or sslrootcert, respectively,
 # causes those to be ignored.)
 
-package SSLServer;
+package SSL::Server;
 
 use strict;
 use warnings;
 use PostgresNode;
+use RecursiveCopy;
 use TestLib;
 use File::Basename;
 use File::Copy;
 use Test::More;
+use SSL::Backend::OpenSSL qw(get_new_openssl_backend);
+use SSL::Backend::NSS qw(get_new_nss_backend);
+
+our ($openssl, $nss, $backend);
+
+# The TLS backend which the server is using should be mostly transparent for
+# the user, apart from individual configuration settings, so keep the backend
+# specific things abstracted behind SSL::Server.
+if ($ENV{with_openssl} eq 'yes')
+{
+	$backend = get_new_openssl_backend();
+	$openssl = 1;
+}
+elsif ($ENV{with_nss} eq 'yes')
+{
+	$backend = get_new_nss_backend();
+	$nss     = 1;
+}
 
 use Exporter 'import';
 our @EXPORT = qw(
@@ -145,12 +164,19 @@ sub configure_test_server_for_ssl
 	close $sslconf;
 
 	# Copy all server certificates and keys, and client root cert, to the data dir
-	copy_files("ssl/server-*.crt", $pgdata);
-	copy_files("ssl/server-*.key", $pgdata);
-	chmod(0600, glob "$pgdata/server-*.key") or die $!;
-	copy_files("ssl/root+client_ca.crt", $pgdata);
-	copy_files("ssl/root_ca.crt",        $pgdata);
-	copy_files("ssl/root+client.crl",    $pgdata);
+	if (defined($openssl))
+	{
+		copy_files("ssl/server-*.crt", $pgdata);
+		copy_files("ssl/server-*.key", $pgdata);
+		chmod(0600, glob "$pgdata/server-*.key") or die $!;
+		copy_files("ssl/root+client_ca.crt", $pgdata);
+		copy_files("ssl/root_ca.crt",        $pgdata);
+		copy_files("ssl/root+client.crl",    $pgdata);
+	}
+	elsif (defined($nss))
+	{
+		RecursiveCopy::copypath("ssl/nss", $pgdata . "/nss") if -e "ssl/nss";
+	}
 
 	# Stop and restart server to load new listen_addresses.
 	$node->restart;
@@ -158,9 +184,22 @@ sub configure_test_server_for_ssl
 	# Change pg_hba after restart because hostssl requires ssl=on
 	configure_hba_for_ssl($node, $servercidr, $authmethod);
 
+	# Finally, perform backend specific configuration
+	$backend->init();
+
 	return;
 }
 
+sub ssl_library
+{
+	return $backend->get_library();
+}
+
+sub cleanup
+{
+	$backend->cleanup();
+}
+
 # Change the configuration to use given server cert file, and reload
 # the server so that the configuration takes effect.
 sub switch_server_cert
@@ -168,14 +207,17 @@ sub switch_server_cert
 	my $node     = $_[0];
 	my $certfile = $_[1];
 	my $cafile   = $_[2] || "root+client_ca";
+	my $keyfile  = $_[3] || '';
+	my $pwcmd    = $_[4] || '';
 	my $pgdata   = $node->data_dir;
 
+	$keyfile = $certfile if $keyfile eq '';
+
 	open my $sslconf, '>', "$pgdata/sslconfig.conf";
 	print $sslconf "ssl=on\n";
-	print $sslconf "ssl_ca_file='$cafile.crt'\n";
-	print $sslconf "ssl_cert_file='$certfile.crt'\n";
-	print $sslconf "ssl_key_file='$certfile.key'\n";
-	print $sslconf "ssl_crl_file='root+client.crl'\n";
+	print $sslconf $backend->set_server_cert($certfile, $cafile, $keyfile);
+	print $sslconf "ssl_passphrase_command='$pwcmd'\n"
+	  unless $pwcmd eq '';
 	close $sslconf;
 
 	$node->restart;
diff --git a/src/tools/msvc/Install.pm b/src/tools/msvc/Install.pm
index b6d0cfd39b..c53c59229e 100644
--- a/src/tools/msvc/Install.pm
+++ b/src/tools/msvc/Install.pm
@@ -438,7 +438,8 @@ sub CopyContribFiles
 		{
 			# These configuration-based exclusions must match vcregress.pl
 			next if ($d eq "uuid-ossp"  && !defined($config->{uuid}));
-			next if ($d eq "sslinfo"    && !defined($config->{openssl}));
+			next if ($d eq "sslinfo"    && !defined($config->{openssl})
+			  && !defined($config->{nss}));
 			next if ($d eq "xml2"       && !defined($config->{xml}));
 			next if ($d =~ /_plperl$/   && !defined($config->{perl}));
 			next if ($d =~ /_plpython$/ && !defined($config->{python}));
diff --git a/src/tools/msvc/Mkvcbuild.pm b/src/tools/msvc/Mkvcbuild.pm
index 20da7985c1..818a1922f3 100644
--- a/src/tools/msvc/Mkvcbuild.pm
+++ b/src/tools/msvc/Mkvcbuild.pm
@@ -192,12 +192,19 @@ sub mkvcbuild
 	$postgres->FullExportDLL('postgres.lib');
 
 	# The OBJS scraper doesn't know about ifdefs, so remove appropriate files
-	# if building without OpenSSL.
-	if (!$solution->{options}->{openssl})
+	# if building without various options.
+	if (!$solution->{options}->{openssl} && !$solution->{options}->{nss})
 	{
 		$postgres->RemoveFile('src/backend/libpq/be-secure-common.c');
+	}
+	if (!$solution->{options}->{openssl})
+	{
 		$postgres->RemoveFile('src/backend/libpq/be-secure-openssl.c');
 	}
+	if (!$solution->{options}->{nss})
+	{
+		$postgres->RemoveFile('src/backend/libpq/be-secure-nss.c');
+	}
 	if (!$solution->{options}->{gss})
 	{
 		$postgres->RemoveFile('src/backend/libpq/be-gssapi-common.c');
@@ -255,12 +262,19 @@ sub mkvcbuild
 	$libpq->AddReference($libpgcommon, $libpgport);
 
 	# The OBJS scraper doesn't know about ifdefs, so remove appropriate files
-	# if building without OpenSSL.
-	if (!$solution->{options}->{openssl})
+	# if building without various options
+	if (!$solution->{options}->{openssl} && !$solution->{options}->{nss})
 	{
 		$libpq->RemoveFile('src/interfaces/libpq/fe-secure-common.c');
+	}
+	if (!$solution->{options}->{openssl})
+	{
 		$libpq->RemoveFile('src/interfaces/libpq/fe-secure-openssl.c');
 	}
+	if (!$solution->{options}->{nss})
+	{
+		$libpq->RemoveFile('src/interfaces/libpq/fe-secure-nss.c');
+	}
 	if (!$solution->{options}->{gss})
 	{
 		$libpq->RemoveFile('src/interfaces/libpq/fe-gssapi-common.c');
@@ -428,9 +442,14 @@ sub mkvcbuild
 		push @contrib_excludes, 'xml2';
 	}
 
+	if (!$solution->{options}->{openssl} && !$solution->{options}->{nss})
+	{
+		push @contrib_excludes, 'sslinfo';
+	}
+
 	if (!$solution->{options}->{openssl})
 	{
-		push @contrib_excludes, 'sslinfo', 'ssl_passphrase_callback';
+		push @contrib_excludes, 'ssl_passphrase_callback';
 	}
 
 	if (!$solution->{options}->{uuid})
diff --git a/src/tools/msvc/Solution.pm b/src/tools/msvc/Solution.pm
index bc8904732f..ac11d9ab26 100644
--- a/src/tools/msvc/Solution.pm
+++ b/src/tools/msvc/Solution.pm
@@ -484,6 +484,7 @@ sub GenerateFiles
 		USE_NAMED_POSIX_SEMAPHORES => undef,
 		USE_OPENSSL                => undef,
 		USE_OPENSSL_RANDOM         => undef,
+		USE_NSS                    => undef,
 		USE_PAM                    => undef,
 		USE_SLICING_BY_8_CRC32C    => undef,
 		USE_SSE42_CRC32C           => undef,
@@ -537,6 +538,10 @@ sub GenerateFiles
 			$define{HAVE_OPENSSL_INIT_SSL}      = 1;
 		}
 	}
+	if ($self->{options}->{nss})
+	{
+		$define{USE_NSS} = 1;
+	}
 
 	$self->GenerateConfigHeader('src/include/pg_config.h',     \%define, 1);
 	$self->GenerateConfigHeader('src/include/pg_config_ext.h', \%define, 0);
@@ -1004,6 +1009,21 @@ sub AddProject
 			}
 		}
 	}
+	if ($self->{options}->{nss})
+	{
+		$proj->AddIncludeDir($self->{options}->{nss} . '\..\public\nss');
+		$proj->AddIncludeDir($self->{options}->{nss} . '\include\nspr');
+		foreach my $lib (qw(plds4 plc4 nspr4))
+		{
+			$proj->AddLibrary($self->{options}->{nss} .
+							  '\lib\lib' . "$lib.lib", 0);
+		}
+		foreach my $lib (qw(ssl3 smime3 nss3))
+		{
+			$proj->AddLibrary($self->{options}->{nss} .
+							  '\lib' . "\\$lib.dll.lib", 0);
+		}
+	}
 	if ($self->{options}->{nls})
 	{
 		$proj->AddIncludeDir($self->{options}->{nls} . '\include');
diff --git a/src/tools/msvc/config_default.pl b/src/tools/msvc/config_default.pl
index 2ef2cfc4e9..49dc4d5864 100644
--- a/src/tools/msvc/config_default.pl
+++ b/src/tools/msvc/config_default.pl
@@ -17,6 +17,7 @@ our $config = {
 	perl      => undef,    # --with-perl=<path>
 	python    => undef,    # --with-python=<path>
 	openssl   => undef,    # --with-openssl=<path>
+	nss       => undef,    # --with-nss=<path>
 	uuid      => undef,    # --with-uuid=<path>
 	xml       => undef,    # --with-libxml=<path>
 	xslt      => undef,    # --with-libxslt=<path>
-- 
2.27.0.windows.1

From fd8f8b3a31018d7f39662d92d454a606e4ef0005 Mon Sep 17 00:00:00 2001
From: Andrew Dunstan <andrew@dunslane.net>
Date: Mon, 3 Aug 2020 12:32:10 -0400
Subject: [PATCH] WIP Support libnss for as TLS backend v7

---
 configure                                     |  211 ++++
 configure.ac                                  |   30 +
 contrib/Makefile                              |    2 +-
 .../postgres_fdw/expected/postgres_fdw.out    |    2 +-
 contrib/sslinfo/sslinfo.c                     |  164 ++-
 doc/src/sgml/sslinfo.sgml                     |   14 +-
 src/Makefile.global.in                        |   10 +
 src/backend/libpq/Makefile                    |    4 +
 src/backend/libpq/auth.c                      |    7 +
 src/backend/libpq/be-secure-nss.c             | 1032 +++++++++++++++++
 src/backend/libpq/be-secure-openssl.c         |   16 +-
 src/backend/libpq/be-secure.c                 |    3 +
 src/backend/utils/misc/guc.c                  |   20 +-
 src/include/common/pg_nss.h                   |  141 +++
 src/include/libpq/libpq-be.h                  |    9 +-
 src/include/libpq/libpq.h                     |    3 +
 src/include/pg_config.h.in                    |    3 +
 src/include/pg_config_manual.h                |    5 +-
 src/interfaces/libpq/Makefile                 |    4 +
 src/interfaces/libpq/fe-connect.c             |    4 +
 src/interfaces/libpq/fe-secure-nss.c          |  975 ++++++++++++++++
 src/interfaces/libpq/fe-secure.c              |    5 +-
 src/interfaces/libpq/libpq-fe.h               |   11 +
 src/interfaces/libpq/libpq-int.h              |    5 +
 src/test/Makefile                             |    2 +-
 src/test/ssl/Makefile                         |  172 +++
 .../cert9.db                                  |  Bin 0 -> 36864 bytes
 .../key4.db                                   |  Bin 0 -> 45056 bytes
 .../pkcs11.txt                                |    5 +
 src/test/ssl/ssl/nss/client-encrypted-pem.pfx |  Bin 0 -> 3149 bytes
 .../cert9.db                                  |  Bin 0 -> 28672 bytes
 .../key4.db                                   |  Bin 0 -> 45056 bytes
 .../pkcs11.txt                                |    5 +
 src/test/ssl/ssl/nss/client-revoked.pfx       |  Bin 0 -> 3149 bytes
 src/test/ssl/ssl/nss/client.crl               |  Bin 0 -> 418 bytes
 ...ient.crt__client-encrypted-pem.key.db.pass |    1 +
 .../cert9.db                                  |  Bin 0 -> 36864 bytes
 .../key4.db                                   |  Bin 0 -> 45056 bytes
 .../pkcs11.txt                                |    5 +
 .../nss/client.crt__client.key.db/cert9.db    |  Bin 0 -> 36864 bytes
 .../ssl/nss/client.crt__client.key.db/key4.db |  Bin 0 -> 45056 bytes
 .../nss/client.crt__client.key.db/pkcs11.txt  |    5 +
 src/test/ssl/ssl/nss/client.pfx               |  Bin 0 -> 3149 bytes
 .../ssl/ssl/nss/client_ca.crt.db/cert9.db     |  Bin 0 -> 28672 bytes
 src/test/ssl/ssl/nss/client_ca.crt.db/key4.db |  Bin 0 -> 36864 bytes
 .../ssl/ssl/nss/client_ca.crt.db/pkcs11.txt   |    5 +
 src/test/ssl/ssl/nss/root+client.crl          |  Bin 0 -> 393 bytes
 .../ssl/nss/root+client_ca.crt.db/cert9.db    |  Bin 0 -> 28672 bytes
 .../ssl/ssl/nss/root+client_ca.crt.db/key4.db |  Bin 0 -> 36864 bytes
 .../ssl/nss/root+client_ca.crt.db/pkcs11.txt  |    5 +
 .../ssl/nss/root+server_ca.crt.db/cert9.db    |  Bin 0 -> 28672 bytes
 .../ssl/ssl/nss/root+server_ca.crt.db/key4.db |  Bin 0 -> 36864 bytes
 .../ssl/nss/root+server_ca.crt.db/pkcs11.txt  |    5 +
 .../cert9.db                                  |  Bin 0 -> 28672 bytes
 .../key4.db                                   |  Bin 0 -> 36864 bytes
 .../pkcs11.txt                                |    5 +
 .../cert9.db                                  |  Bin 0 -> 28672 bytes
 .../root+server_ca.crt__server.crl.db/key4.db |  Bin 0 -> 36864 bytes
 .../pkcs11.txt                                |    5 +
 src/test/ssl/ssl/nss/root.crl                 |  Bin 0 -> 393 bytes
 .../cert9.db                                  |  Bin 0 -> 36864 bytes
 .../key4.db                                   |  Bin 0 -> 45056 bytes
 .../pkcs11.txt                                |    5 +
 .../ssl/ssl/nss/server-cn-and-alt-names.pfx   |  Bin 0 -> 3349 bytes
 .../cert9.db                                  |  Bin 0 -> 28672 bytes
 .../key4.db                                   |  Bin 0 -> 45056 bytes
 .../pkcs11.txt                                |    5 +
 .../cert9.db                                  |  Bin 0 -> 36864 bytes
 .../key4.db                                   |  Bin 0 -> 45056 bytes
 .../pkcs11.txt                                |    5 +
 src/test/ssl/ssl/nss/server-cn-only.pfx       |  Bin 0 -> 3197 bytes
 .../cert9.db                                  |  Bin 0 -> 36864 bytes
 .../key4.db                                   |  Bin 0 -> 45056 bytes
 .../pkcs11.txt                                |    5 +
 .../ssl/ssl/nss/server-multiple-alt-names.pfx |  Bin 0 -> 3325 bytes
 .../cert9.db                                  |  Bin 0 -> 36864 bytes
 .../key4.db                                   |  Bin 0 -> 45056 bytes
 .../pkcs11.txt                                |    5 +
 src/test/ssl/ssl/nss/server-no-names.pfx      |  Bin 0 -> 3109 bytes
 src/test/ssl/ssl/nss/server-password.pfx      |  Bin 0 -> 3197 bytes
 .../cert9.db                                  |  Bin 0 -> 36864 bytes
 .../key4.db                                   |  Bin 0 -> 45056 bytes
 .../pkcs11.txt                                |    5 +
 src/test/ssl/ssl/nss/server-revoked.pfx       |  Bin 0 -> 3181 bytes
 .../cert9.db                                  |  Bin 0 -> 36864 bytes
 .../key4.db                                   |  Bin 0 -> 45056 bytes
 .../pkcs11.txt                                |    5 +
 .../ssl/ssl/nss/server-single-alt-name.pfx    |  Bin 0 -> 3213 bytes
 src/test/ssl/ssl/nss/server.crl               |  Bin 0 -> 418 bytes
 .../ssl/ssl/nss/server_ca.crt.db/cert9.db     |  Bin 0 -> 28672 bytes
 src/test/ssl/ssl/nss/server_ca.crt.db/key4.db |  Bin 0 -> 36864 bytes
 .../ssl/ssl/nss/server_ca.crt.db/pkcs11.txt   |    5 +
 src/test/ssl/t/001_ssltests.pl                |  289 ++---
 src/test/ssl/t/002_scram.pl                   |    4 +-
 src/test/ssl/t/SSL/Backend/NSS.pm             |   64 +
 src/test/ssl/t/SSL/Backend/OpenSSL.pm         |  103 ++
 .../ssl/t/{SSLServer.pm => SSL/Server.pm}     |   80 +-
 src/tools/msvc/Install.pm                     |    3 +-
 src/tools/msvc/Mkvcbuild.pm                   |   29 +-
 src/tools/msvc/Solution.pm                    |   20 +
 src/tools/msvc/config_default.pl              |    1 +
 101 files changed, 3276 insertions(+), 257 deletions(-)
 create mode 100644 src/backend/libpq/be-secure-nss.c
 create mode 100644 src/include/common/pg_nss.h
 create mode 100644 src/interfaces/libpq/fe-secure-nss.c
 create mode 100644 src/test/ssl/ssl/nss/client+client_ca.crt__client.key.db/cert9.db
 create mode 100644 src/test/ssl/ssl/nss/client+client_ca.crt__client.key.db/key4.db
 create mode 100644 src/test/ssl/ssl/nss/client+client_ca.crt__client.key.db/pkcs11.txt
 create mode 100644 src/test/ssl/ssl/nss/client-encrypted-pem.pfx
 create mode 100644 src/test/ssl/ssl/nss/client-revoked.crt__client-revoked.key.db/cert9.db
 create mode 100644 src/test/ssl/ssl/nss/client-revoked.crt__client-revoked.key.db/key4.db
 create mode 100644 src/test/ssl/ssl/nss/client-revoked.crt__client-revoked.key.db/pkcs11.txt
 create mode 100644 src/test/ssl/ssl/nss/client-revoked.pfx
 create mode 100644 src/test/ssl/ssl/nss/client.crl
 create mode 100644 src/test/ssl/ssl/nss/client.crt__client-encrypted-pem.key.db.pass
 create mode 100644 src/test/ssl/ssl/nss/client.crt__client-encrypted-pem.key.db/cert9.db
 create mode 100644 src/test/ssl/ssl/nss/client.crt__client-encrypted-pem.key.db/key4.db
 create mode 100644 src/test/ssl/ssl/nss/client.crt__client-encrypted-pem.key.db/pkcs11.txt
 create mode 100644 src/test/ssl/ssl/nss/client.crt__client.key.db/cert9.db
 create mode 100644 src/test/ssl/ssl/nss/client.crt__client.key.db/key4.db
 create mode 100644 src/test/ssl/ssl/nss/client.crt__client.key.db/pkcs11.txt
 create mode 100644 src/test/ssl/ssl/nss/client.pfx
 create mode 100644 src/test/ssl/ssl/nss/client_ca.crt.db/cert9.db
 create mode 100644 src/test/ssl/ssl/nss/client_ca.crt.db/key4.db
 create mode 100644 src/test/ssl/ssl/nss/client_ca.crt.db/pkcs11.txt
 create mode 100644 src/test/ssl/ssl/nss/root+client.crl
 create mode 100644 src/test/ssl/ssl/nss/root+client_ca.crt.db/cert9.db
 create mode 100644 src/test/ssl/ssl/nss/root+client_ca.crt.db/key4.db
 create mode 100644 src/test/ssl/ssl/nss/root+client_ca.crt.db/pkcs11.txt
 create mode 100644 src/test/ssl/ssl/nss/root+server_ca.crt.db/cert9.db
 create mode 100644 src/test/ssl/ssl/nss/root+server_ca.crt.db/key4.db
 create mode 100644 src/test/ssl/ssl/nss/root+server_ca.crt.db/pkcs11.txt
 create mode 100644 src/test/ssl/ssl/nss/root+server_ca.crt__root+server.crl.db/cert9.db
 create mode 100644 src/test/ssl/ssl/nss/root+server_ca.crt__root+server.crl.db/key4.db
 create mode 100644 src/test/ssl/ssl/nss/root+server_ca.crt__root+server.crl.db/pkcs11.txt
 create mode 100644 src/test/ssl/ssl/nss/root+server_ca.crt__server.crl.db/cert9.db
 create mode 100644 src/test/ssl/ssl/nss/root+server_ca.crt__server.crl.db/key4.db
 create mode 100644 src/test/ssl/ssl/nss/root+server_ca.crt__server.crl.db/pkcs11.txt
 create mode 100644 src/test/ssl/ssl/nss/root.crl
 create mode 100644 src/test/ssl/ssl/nss/server-cn-and-alt-names.crt__server-cn-and-alt-names.key.db/cert9.db
 create mode 100644 src/test/ssl/ssl/nss/server-cn-and-alt-names.crt__server-cn-and-alt-names.key.db/key4.db
 create mode 100644 src/test/ssl/ssl/nss/server-cn-and-alt-names.crt__server-cn-and-alt-names.key.db/pkcs11.txt
 create mode 100644 src/test/ssl/ssl/nss/server-cn-and-alt-names.pfx
 create mode 100644 src/test/ssl/ssl/nss/server-cn-only.crt__server-cn-only.key.db/cert9.db
 create mode 100644 src/test/ssl/ssl/nss/server-cn-only.crt__server-cn-only.key.db/key4.db
 create mode 100644 src/test/ssl/ssl/nss/server-cn-only.crt__server-cn-only.key.db/pkcs11.txt
 create mode 100644 src/test/ssl/ssl/nss/server-cn-only.crt__server-password.key.db/cert9.db
 create mode 100644 src/test/ssl/ssl/nss/server-cn-only.crt__server-password.key.db/key4.db
 create mode 100644 src/test/ssl/ssl/nss/server-cn-only.crt__server-password.key.db/pkcs11.txt
 create mode 100644 src/test/ssl/ssl/nss/server-cn-only.pfx
 create mode 100644 src/test/ssl/ssl/nss/server-multiple-alt-names.crt__server-multiple-alt-names.key.db/cert9.db
 create mode 100644 src/test/ssl/ssl/nss/server-multiple-alt-names.crt__server-multiple-alt-names.key.db/key4.db
 create mode 100644 src/test/ssl/ssl/nss/server-multiple-alt-names.crt__server-multiple-alt-names.key.db/pkcs11.txt
 create mode 100644 src/test/ssl/ssl/nss/server-multiple-alt-names.pfx
 create mode 100644 src/test/ssl/ssl/nss/server-no-names.crt__server-no-names.key.db/cert9.db
 create mode 100644 src/test/ssl/ssl/nss/server-no-names.crt__server-no-names.key.db/key4.db
 create mode 100644 src/test/ssl/ssl/nss/server-no-names.crt__server-no-names.key.db/pkcs11.txt
 create mode 100644 src/test/ssl/ssl/nss/server-no-names.pfx
 create mode 100644 src/test/ssl/ssl/nss/server-password.pfx
 create mode 100644 src/test/ssl/ssl/nss/server-revoked.crt__server-revoked.key.db/cert9.db
 create mode 100644 src/test/ssl/ssl/nss/server-revoked.crt__server-revoked.key.db/key4.db
 create mode 100644 src/test/ssl/ssl/nss/server-revoked.crt__server-revoked.key.db/pkcs11.txt
 create mode 100644 src/test/ssl/ssl/nss/server-revoked.pfx
 create mode 100644 src/test/ssl/ssl/nss/server-single-alt-name.crt__server-single-alt-name.key.db/cert9.db
 create mode 100644 src/test/ssl/ssl/nss/server-single-alt-name.crt__server-single-alt-name.key.db/key4.db
 create mode 100644 src/test/ssl/ssl/nss/server-single-alt-name.crt__server-single-alt-name.key.db/pkcs11.txt
 create mode 100644 src/test/ssl/ssl/nss/server-single-alt-name.pfx
 create mode 100644 src/test/ssl/ssl/nss/server.crl
 create mode 100644 src/test/ssl/ssl/nss/server_ca.crt.db/cert9.db
 create mode 100644 src/test/ssl/ssl/nss/server_ca.crt.db/key4.db
 create mode 100644 src/test/ssl/ssl/nss/server_ca.crt.db/pkcs11.txt
 create mode 100644 src/test/ssl/t/SSL/Backend/NSS.pm
 create mode 100644 src/test/ssl/t/SSL/Backend/OpenSSL.pm
 rename src/test/ssl/t/{SSLServer.pm => SSL/Server.pm} (78%)

diff --git a/configure b/configure
index cb8fbe1051..8b7d98c2ab 100755
--- a/configure
+++ b/configure
@@ -711,6 +711,7 @@ with_uuid
 with_readline
 with_systemd
 with_selinux
+with_nss
 with_openssl
 with_ldap
 with_krb_srvnam
@@ -856,6 +857,7 @@ with_bsd_auth
 with_ldap
 with_bonjour
 with_openssl
+with_nss
 with_selinux
 with_systemd
 with_readline
@@ -1558,6 +1560,7 @@ Optional Packages:
   --with-ldap             build with LDAP support
   --with-bonjour          build with Bonjour support
   --with-openssl          build with OpenSSL support
+  --with-nss              build with NSS support
   --with-selinux          build with SELinux support
   --with-systemd          build with systemd support
   --without-readline      do not use GNU Readline nor BSD Libedit for editing
@@ -8100,6 +8103,41 @@ fi
 $as_echo "$with_openssl" >&6; }
 
 
+#
+# LibNSS
+#
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether to build with NSS support" >&5
+$as_echo_n "checking whether to build with NSS support... " >&6; }
+
+
+
+# Check whether --with-nss was given.
+if test "${with_nss+set}" = set; then :
+  withval=$with_nss;
+  case $withval in
+    yes)
+
+$as_echo "#define USE_NSS 1" >>confdefs.h
+
+      ;;
+    no)
+      :
+      ;;
+    *)
+      as_fn_error $? "no argument expected for --with-nss option" "$LINENO" 5
+      ;;
+  esac
+
+else
+  with_nss=no
+
+fi
+
+
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $with_nss" >&5
+$as_echo "$with_nss" >&6; }
+
+
 #
 # SELinux
 #
@@ -12174,6 +12212,9 @@ fi
 fi
 
 if test "$with_openssl" = yes ; then
+  if test x"$with_nss" = x"yes" ; then
+    as_fn_error $? "multiple SSL backends cannot be enabled simultaneously\"" "$LINENO" 5
+  fi
     # Minimum required OpenSSL version is 1.0.1
 
 $as_echo "#define OPENSSL_API_COMPAT 0x10001000L" >>confdefs.h
@@ -12436,6 +12477,157 @@ done
 
 fi
 
+if test "$with_nss" = yes ; then
+  if test x"$with_openssl" = x"yes" ; then
+    as_fn_error $? "multiple SSL backends cannot be enabled simultaneously\"" "$LINENO" 5
+  fi
+  CLEANLDFLAGS="$LDFLAGS"
+  # TODO: document this set of LDFLAGS
+  LDFLAGS="-lssl3 -lsmime3 -lnss3 -lplds4 -lplc4 -lnspr4 $LDFLAGS"
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for SSL_VersionRangeSet in -lnss3" >&5
+$as_echo_n "checking for SSL_VersionRangeSet in -lnss3... " >&6; }
+if ${ac_cv_lib_nss3_SSL_VersionRangeSet+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lnss3  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char SSL_VersionRangeSet ();
+int
+main ()
+{
+return SSL_VersionRangeSet ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_lib_nss3_SSL_VersionRangeSet=yes
+else
+  ac_cv_lib_nss3_SSL_VersionRangeSet=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_nss3_SSL_VersionRangeSet" >&5
+$as_echo "$ac_cv_lib_nss3_SSL_VersionRangeSet" >&6; }
+if test "x$ac_cv_lib_nss3_SSL_VersionRangeSet" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_LIBNSS3 1
+_ACEOF
+
+  LIBS="-lnss3 $LIBS"
+
+else
+  as_fn_error $? "library 'nss3' is required for NSS" "$LINENO" 5
+fi
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for PR_GetDefaultIOMethods in -lnspr4" >&5
+$as_echo_n "checking for PR_GetDefaultIOMethods in -lnspr4... " >&6; }
+if ${ac_cv_lib_nspr4_PR_GetDefaultIOMethods+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lnspr4  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char PR_GetDefaultIOMethods ();
+int
+main ()
+{
+return PR_GetDefaultIOMethods ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_lib_nspr4_PR_GetDefaultIOMethods=yes
+else
+  ac_cv_lib_nspr4_PR_GetDefaultIOMethods=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_nspr4_PR_GetDefaultIOMethods" >&5
+$as_echo "$ac_cv_lib_nspr4_PR_GetDefaultIOMethods" >&6; }
+if test "x$ac_cv_lib_nspr4_PR_GetDefaultIOMethods" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_LIBNSPR4 1
+_ACEOF
+
+  LIBS="-lnspr4 $LIBS"
+
+else
+  as_fn_error $? "library 'nspr4' is required for NSS" "$LINENO" 5
+fi
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for SSL_GetImplementedCiphers in -lssl3" >&5
+$as_echo_n "checking for SSL_GetImplementedCiphers in -lssl3... " >&6; }
+if ${ac_cv_lib_ssl3_SSL_GetImplementedCiphers+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lssl3  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char SSL_GetImplementedCiphers ();
+int
+main ()
+{
+return SSL_GetImplementedCiphers ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_lib_ssl3_SSL_GetImplementedCiphers=yes
+else
+  ac_cv_lib_ssl3_SSL_GetImplementedCiphers=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_ssl3_SSL_GetImplementedCiphers" >&5
+$as_echo "$ac_cv_lib_ssl3_SSL_GetImplementedCiphers" >&6; }
+if test "x$ac_cv_lib_ssl3_SSL_GetImplementedCiphers" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_LIBSSL3 1
+_ACEOF
+
+  LIBS="-lssl3 $LIBS"
+
+else
+  as_fn_error $? "library 'ssl3' is required for NSS" "$LINENO" 5
+fi
+
+  LDFLAGS="$CLEANLDFLAGS"
+fi
+
 if test "$with_pam" = yes ; then
   { $as_echo "$as_me:${as_lineno-$LINENO}: checking for pam_start in -lpam" >&5
 $as_echo_n "checking for pam_start in -lpam... " >&6; }
@@ -13338,6 +13530,25 @@ else
 fi
 
 
+fi
+
+if test "$with_nss" = yes ; then
+  ac_fn_c_check_header_mongrel "$LINENO" "ssl.h" "ac_cv_header_ssl_h" "$ac_includes_default"
+if test "x$ac_cv_header_ssl_h" = xyes; then :
+
+else
+  as_fn_error $? "header file <ssl.h> is required for NSS" "$LINENO" 5
+fi
+
+
+  ac_fn_c_check_header_mongrel "$LINENO" "nss.h" "ac_cv_header_nss_h" "$ac_includes_default"
+if test "x$ac_cv_header_nss_h" = xyes; then :
+
+else
+  as_fn_error $? "header file <nss.h> is required for NSS" "$LINENO" 5
+fi
+
+
 fi
 
 if test "$with_pam" = yes ; then
diff --git a/configure.ac b/configure.ac
index eb2c731b58..23c07cabce 100644
--- a/configure.ac
+++ b/configure.ac
@@ -856,6 +856,15 @@ PGAC_ARG_BOOL(with, openssl, no, [build with OpenSSL support],
 AC_MSG_RESULT([$with_openssl])
 AC_SUBST(with_openssl)
 
+#
+# LibNSS
+#
+AC_MSG_CHECKING([whether to build with NSS support])
+PGAC_ARG_BOOL(with, nss, no, [build with NSS support],
+              [AC_DEFINE([USE_NSS], 1, [Define to build with NSS support. (--with-nss)])])
+AC_MSG_RESULT([$with_nss])
+AC_SUBST(with_nss)
+
 #
 # SELinux
 #
@@ -1205,6 +1214,9 @@ if test "$with_gssapi" = yes ; then
 fi
 
 if test "$with_openssl" = yes ; then
+  if test x"$with_nss" = x"yes" ; then
+    AC_MSG_ERROR([multiple SSL backends cannot be enabled simultaneously"])
+  fi
   dnl Order matters!
   # Minimum required OpenSSL version is 1.0.1
   AC_DEFINE(OPENSSL_API_COMPAT, [0x10001000L],
@@ -1230,6 +1242,19 @@ if test "$with_openssl" = yes ; then
   AC_CHECK_FUNCS([CRYPTO_lock])
 fi
 
+if test "$with_nss" = yes ; then
+  if test x"$with_openssl" = x"yes" ; then
+    AC_MSG_ERROR([multiple SSL backends cannot be enabled simultaneously"])
+  fi
+  CLEANLDFLAGS="$LDFLAGS"
+  # TODO: document this set of LDFLAGS
+  LDFLAGS="-lssl3 -lsmime3 -lnss3 -lplds4 -lplc4 -lnspr4 $LDFLAGS"
+  AC_CHECK_LIB(nss3, SSL_VersionRangeSet, [], [AC_MSG_ERROR([library 'nss3' is required for NSS])])
+  AC_CHECK_LIB(nspr4, PR_GetDefaultIOMethods, [], [AC_MSG_ERROR([library 'nspr4' is required for NSS])])
+  AC_CHECK_LIB(ssl3, SSL_GetImplementedCiphers, [], [AC_MSG_ERROR([library 'ssl3' is required for NSS])])
+  LDFLAGS="$CLEANLDFLAGS"
+fi
+
 if test "$with_pam" = yes ; then
   AC_CHECK_LIB(pam,    pam_start, [], [AC_MSG_ERROR([library 'pam' is required for PAM])])
 fi
@@ -1405,6 +1430,11 @@ if test "$with_openssl" = yes ; then
   AC_CHECK_HEADER(openssl/err.h, [], [AC_MSG_ERROR([header file <openssl/err.h> is required for OpenSSL])])
 fi
 
+if test "$with_nss" = yes ; then
+  AC_CHECK_HEADER(ssl.h, [], [AC_MSG_ERROR([header file <ssl.h> is required for NSS])])
+  AC_CHECK_HEADER(nss.h, [], [AC_MSG_ERROR([header file <nss.h> is required for NSS])])
+fi
+
 if test "$with_pam" = yes ; then
   AC_CHECK_HEADERS(security/pam_appl.h, [],
                    [AC_CHECK_HEADERS(pam/pam_appl.h, [],
diff --git a/contrib/Makefile b/contrib/Makefile
index 1846d415b6..cef7bf7f61 100644
--- a/contrib/Makefile
+++ b/contrib/Makefile
@@ -50,7 +50,7 @@ SUBDIRS = \
 		unaccent	\
 		vacuumlo
 
-ifeq ($(with_openssl),yes)
+ifeq ($(with_ssl),yes)
 SUBDIRS += sslinfo
 else
 ALWAYS_SUBDIRS += sslinfo
diff --git a/contrib/postgres_fdw/expected/postgres_fdw.out b/contrib/postgres_fdw/expected/postgres_fdw.out
index 90db550b92..961cb56358 100644
--- a/contrib/postgres_fdw/expected/postgres_fdw.out
+++ b/contrib/postgres_fdw/expected/postgres_fdw.out
@@ -8898,7 +8898,7 @@ DO $d$
     END;
 $d$;
 ERROR:  invalid option "password"
-HINT:  Valid options in this context are: service, passfile, channel_binding, connect_timeout, dbname, host, hostaddr, port, options, application_name, keepalives, keepalives_idle, keepalives_interval, keepalives_count, tcp_user_timeout, sslmode, sslcompression, sslcert, sslkey, sslrootcert, sslcrl, requirepeer, ssl_min_protocol_version, ssl_max_protocol_version, gssencmode, krbsrvname, gsslib, target_session_attrs, use_remote_estimate, fdw_startup_cost, fdw_tuple_cost, extensions, updatable, fetch_size
+HINT:  Valid options in this context are: service, passfile, channel_binding, connect_timeout, dbname, host, hostaddr, port, options, application_name, keepalives, keepalives_idle, keepalives_interval, keepalives_count, tcp_user_timeout, sslmode, sslcompression, sslcert, sslkey, sslrootcert, sslcrl, requirepeer, ssl_min_protocol_version, ssl_max_protocol_version, gssencmode, krbsrvname, gsslib, target_session_attrs, cert_database, use_remote_estimate, fdw_startup_cost, fdw_tuple_cost, extensions, updatable, fetch_size
 CONTEXT:  SQL statement "ALTER SERVER loopback_nopw OPTIONS (ADD password 'dummypw')"
 PL/pgSQL function inline_code_block line 3 at EXECUTE
 -- If we add a password for our user mapping instead, we should get a different
diff --git a/contrib/sslinfo/sslinfo.c b/contrib/sslinfo/sslinfo.c
index 5ba3988e27..84bb2c65b8 100644
--- a/contrib/sslinfo/sslinfo.c
+++ b/contrib/sslinfo/sslinfo.c
@@ -9,9 +9,11 @@
 
 #include "postgres.h"
 
+#ifdef USE_OPENSSL
 #include <openssl/x509.h>
 #include <openssl/x509v3.h>
 #include <openssl/asn1.h>
+#endif
 
 #include "access/htup_details.h"
 #include "funcapi.h"
@@ -21,8 +23,8 @@
 
 PG_MODULE_MAGIC;
 
+#ifdef USE_OPENSSL
 static Datum X509_NAME_field_to_text(X509_NAME *name, text *fieldName);
-static Datum X509_NAME_to_text(X509_NAME *name);
 static Datum ASN1_STRING_to_text(ASN1_STRING *str);
 
 /*
@@ -32,6 +34,7 @@ typedef struct
 {
 	TupleDesc	tupdesc;
 } SSLExtensionInfoContext;
+#endif
 
 /*
  * Indicates whether current session uses SSL
@@ -54,9 +57,16 @@ PG_FUNCTION_INFO_V1(ssl_version);
 Datum
 ssl_version(PG_FUNCTION_ARGS)
 {
-	if (MyProcPort->ssl == NULL)
+	const char *version;
+
+	if (!MyProcPort->ssl_in_use)
+		PG_RETURN_NULL();
+
+	version = be_tls_get_version(MyProcPort);
+	if (version == NULL)
 		PG_RETURN_NULL();
-	PG_RETURN_TEXT_P(cstring_to_text(SSL_get_version(MyProcPort->ssl)));
+
+	PG_RETURN_TEXT_P(cstring_to_text(version));
 }
 
 
@@ -67,9 +77,16 @@ PG_FUNCTION_INFO_V1(ssl_cipher);
 Datum
 ssl_cipher(PG_FUNCTION_ARGS)
 {
-	if (MyProcPort->ssl == NULL)
+	const char *cipher;
+
+	if (!MyProcPort->ssl_in_use)
 		PG_RETURN_NULL();
-	PG_RETURN_TEXT_P(cstring_to_text(SSL_get_cipher(MyProcPort->ssl)));
+
+	cipher = be_tls_get_cipher(MyProcPort);
+	if (cipher == NULL)
+		PG_RETURN_NULL();
+
+	PG_RETURN_TEXT_P(cstring_to_text(cipher));
 }
 
 
@@ -83,7 +100,7 @@ PG_FUNCTION_INFO_V1(ssl_client_cert_present);
 Datum
 ssl_client_cert_present(PG_FUNCTION_ARGS)
 {
-	PG_RETURN_BOOL(MyProcPort->peer != NULL);
+	PG_RETURN_BOOL(MyProcPort->peer_cert_valid);
 }
 
 
@@ -99,29 +116,26 @@ PG_FUNCTION_INFO_V1(ssl_client_serial);
 Datum
 ssl_client_serial(PG_FUNCTION_ARGS)
 {
+	char decimal[NAMEDATALEN];
 	Datum		result;
-	Port	   *port = MyProcPort;
-	X509	   *peer = port->peer;
-	ASN1_INTEGER *serial = NULL;
-	BIGNUM	   *b;
-	char	   *decimal;
 
-	if (!peer)
+	if (!MyProcPort->ssl_in_use || !MyProcPort->peer_cert_valid)
+		PG_RETURN_NULL();
+
+	be_tls_get_peer_serial(MyProcPort, decimal, NAMEDATALEN);
+
+	if (!*decimal)
 		PG_RETURN_NULL();
-	serial = X509_get_serialNumber(peer);
-	b = ASN1_INTEGER_to_BN(serial, NULL);
-	decimal = BN_bn2dec(b);
 
-	BN_free(b);
 	result = DirectFunctionCall3(numeric_in,
 								 CStringGetDatum(decimal),
 								 ObjectIdGetDatum(0),
 								 Int32GetDatum(-1));
-	OPENSSL_free(decimal);
 	return result;
 }
 
 
+#ifdef USE_OPENSSL
 /*
  * Converts OpenSSL ASN1_STRING structure into text
  *
@@ -228,7 +242,7 @@ ssl_client_dn_field(PG_FUNCTION_ARGS)
 	text	   *fieldname = PG_GETARG_TEXT_PP(0);
 	Datum		result;
 
-	if (!(MyProcPort->peer))
+	if (!MyProcPort->ssl_in_use || !MyProcPort->peer_cert_valid)
 		PG_RETURN_NULL();
 
 	result = X509_NAME_field_to_text(X509_get_subject_name(MyProcPort->peer), fieldname);
@@ -273,76 +287,23 @@ ssl_issuer_field(PG_FUNCTION_ARGS)
 	else
 		return result;
 }
+#endif							/* USE_OPENSSL */
 
-
-/*
- * Equivalent of X509_NAME_oneline that respects encoding
- *
- * This function converts X509_NAME structure to the text variable
- * converting all textual data into current database encoding.
- *
- * Parameter: X509_NAME *name X509_NAME structure to be converted
- *
- * Returns: text datum which contains string representation of
- * X509_NAME
- */
-static Datum
-X509_NAME_to_text(X509_NAME *name)
+#ifdef USE_NSS
+PG_FUNCTION_INFO_V1(ssl_client_dn_field);
+Datum
+ssl_client_dn_field(PG_FUNCTION_ARGS)
 {
-	BIO		   *membuf = BIO_new(BIO_s_mem());
-	int			i,
-				nid,
-				count = X509_NAME_entry_count(name);
-	X509_NAME_ENTRY *e;
-	ASN1_STRING *v;
-	const char *field_name;
-	size_t		size;
-	char		nullterm;
-	char	   *sp;
-	char	   *dp;
-	text	   *result;
-
-	if (membuf == NULL)
-		ereport(ERROR,
-				(errcode(ERRCODE_OUT_OF_MEMORY),
-				 errmsg("could not create OpenSSL BIO structure")));
-
-	(void) BIO_set_close(membuf, BIO_CLOSE);
-	for (i = 0; i < count; i++)
-	{
-		e = X509_NAME_get_entry(name, i);
-		nid = OBJ_obj2nid(X509_NAME_ENTRY_get_object(e));
-		if (nid == NID_undef)
-			ereport(ERROR,
-					(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
-					 errmsg("could not get NID for ASN1_OBJECT object")));
-		v = X509_NAME_ENTRY_get_data(e);
-		field_name = OBJ_nid2sn(nid);
-		if (field_name == NULL)
-			field_name = OBJ_nid2ln(nid);
-		if (field_name == NULL)
-			ereport(ERROR,
-					(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
-					 errmsg("could not convert NID %d to an ASN1_OBJECT structure", nid)));
-		BIO_printf(membuf, "/%s=", field_name);
-		ASN1_STRING_print_ex(membuf, v,
-							 ((ASN1_STRFLGS_RFC2253 & ~ASN1_STRFLGS_ESC_MSB)
-							  | ASN1_STRFLGS_UTF8_CONVERT));
-	}
-
-	/* ensure null termination of the BIO's content */
-	nullterm = '\0';
-	BIO_write(membuf, &nullterm, 1);
-	size = BIO_get_mem_data(membuf, &sp);
-	dp = pg_any_to_server(sp, size - 1, PG_UTF8);
-	result = cstring_to_text(dp);
-	if (dp != sp)
-		pfree(dp);
-	if (BIO_free(membuf) != 1)
-		elog(ERROR, "could not free OpenSSL BIO structure");
+	PG_RETURN_NULL();
+}
 
-	PG_RETURN_TEXT_P(result);
+PG_FUNCTION_INFO_V1(ssl_issuer_field);
+Datum
+ssl_issuer_field(PG_FUNCTION_ARGS)
+{
+	PG_RETURN_NULL();
 }
+#endif							/* USE_NSS */
 
 
 /*
@@ -358,9 +319,17 @@ PG_FUNCTION_INFO_V1(ssl_client_dn);
 Datum
 ssl_client_dn(PG_FUNCTION_ARGS)
 {
-	if (!(MyProcPort->peer))
+	char		subject[NAMEDATALEN];
+
+	if (!MyProcPort->ssl_in_use || !MyProcPort->peer_cert_valid)
+		PG_RETURN_NULL();
+
+	be_tls_get_peer_subject_name(MyProcPort, subject, NAMEDATALEN);
+
+	if (!*subject)
 		PG_RETURN_NULL();
-	return X509_NAME_to_text(X509_get_subject_name(MyProcPort->peer));
+
+	PG_RETURN_TEXT_P(cstring_to_text(subject));
 }
 
 
@@ -377,12 +346,21 @@ PG_FUNCTION_INFO_V1(ssl_issuer_dn);
 Datum
 ssl_issuer_dn(PG_FUNCTION_ARGS)
 {
-	if (!(MyProcPort->peer))
+	char		issuer[NAMEDATALEN];
+
+	if (!MyProcPort->ssl_in_use || !MyProcPort->peer_cert_valid)
+		PG_RETURN_NULL();
+
+	be_tls_get_peer_issuer_name(MyProcPort, issuer, NAMEDATALEN);
+
+	if (!*issuer)
 		PG_RETURN_NULL();
-	return X509_NAME_to_text(X509_get_issuer_name(MyProcPort->peer));
+
+	PG_RETURN_TEXT_P(cstring_to_text(issuer));
 }
 
 
+#ifdef USE_OPENSSL
 /*
  * Returns information about available SSL extensions.
  *
@@ -516,3 +494,13 @@ ssl_extension_info(PG_FUNCTION_ARGS)
 	/* All done */
 	SRF_RETURN_DONE(funcctx);
 }
+#endif							/* USE_OPENSSL */
+
+#ifdef USE_NSS
+PG_FUNCTION_INFO_V1(ssl_extension_info);
+Datum
+ssl_extension_info(PG_FUNCTION_ARGS)
+{
+	PG_RETURN_NULL();
+}
+#endif							/* USE_NSS */
diff --git a/doc/src/sgml/sslinfo.sgml b/doc/src/sgml/sslinfo.sgml
index c237d4ba95..d15a206d2d 100644
--- a/doc/src/sgml/sslinfo.sgml
+++ b/doc/src/sgml/sslinfo.sgml
@@ -22,7 +22,8 @@
 
  <para>
   This extension won't build at all unless the installation was
-  configured with <literal>--with-openssl</literal>.
+  configured with SSL support, such as <literal>--with-openssl</literal>
+  or <literal>--with-nss</literal>.
  </para>
 
  <sect2>
@@ -54,7 +55,7 @@
     <listitem>
     <para>
      Returns the name of the protocol used for the SSL connection (e.g. TLSv1.0
-     TLSv1.1, or TLSv1.2).
+     TLSv1.1, TLSv1.2 or TLSv1.3).
     </para>
     </listitem>
    </varlistentry>
@@ -208,6 +209,9 @@ emailAddress
      the X.500 and X.509 standards, so you cannot just assign arbitrary
      meaning to them.
     </para>
+    <para>
+     This function is only available when using OpenSSL.
+    </para>
     </listitem>
    </varlistentry>
 
@@ -223,6 +227,9 @@ emailAddress
      Same as <function>ssl_client_dn_field</function>, but for the certificate issuer
      rather than the certificate subject.
     </para>
+    <para>
+     This function is only available when using OpenSSL.
+    </para>
     </listitem>
    </varlistentry>
 
@@ -238,6 +245,9 @@ emailAddress
      Provide information about extensions of client certificate: extension name,
      extension value, and if it is a critical extension.
     </para>
+    <para>
+     This function is only available when using OpenSSL.
+    </para>
     </listitem>
    </varlistentry>
   </variablelist>
diff --git a/src/Makefile.global.in b/src/Makefile.global.in
index 9a6265b3a0..2f25c51c6c 100644
--- a/src/Makefile.global.in
+++ b/src/Makefile.global.in
@@ -184,6 +184,7 @@ with_perl	= @with_perl@
 with_python	= @with_python@
 with_tcl	= @with_tcl@
 with_openssl	= @with_openssl@
+with_nss        = @with_nss@
 with_readline	= @with_readline@
 with_selinux	= @with_selinux@
 with_systemd	= @with_systemd@
@@ -232,6 +233,15 @@ CLANG = @CLANG@
 BITCODE_CFLAGS = @BITCODE_CFLAGS@
 BITCODE_CXXFLAGS = @BITCODE_CXXFLAGS@
 
+ifeq ($(with_openssl),yes)
+with_ssl = yes
+else ifeq ($(with_nss),yes)
+with_ssl = yes
+else
+with_ssl = no
+endif
+
+
 ##########################################################################
 #
 # Programs and flags
diff --git a/src/backend/libpq/Makefile b/src/backend/libpq/Makefile
index efc5ef760a..191266a426 100644
--- a/src/backend/libpq/Makefile
+++ b/src/backend/libpq/Makefile
@@ -30,6 +30,10 @@ OBJS = \
 
 ifeq ($(with_openssl),yes)
 OBJS += be-secure-openssl.o
+else
+ifeq ($(with_nss),yes)
+OBJS += be-secure-nss.o
+endif
 endif
 
 ifeq ($(with_gssapi),yes)
diff --git a/src/backend/libpq/auth.c b/src/backend/libpq/auth.c
index 02b6c3f127..8f4197d002 100644
--- a/src/backend/libpq/auth.c
+++ b/src/backend/libpq/auth.c
@@ -2870,7 +2870,14 @@ CheckCertAuth(Port *port)
 {
 	int			status_check_usermap = STATUS_ERROR;
 
+#if defined(USE_OPENSSL)
 	Assert(port->ssl);
+#elif defined(USE_NSS)
+	/* TODO: should we rename pr_fd to ssl, to keep consistency? */
+	Assert(port->pr_fd);
+#else
+	Assert(false);
+#endif
 
 	/* Make sure we have received a username in the certificate */
 	if (port->peer_cn == NULL ||
diff --git a/src/backend/libpq/be-secure-nss.c b/src/backend/libpq/be-secure-nss.c
new file mode 100644
index 0000000000..00ae054920
--- /dev/null
+++ b/src/backend/libpq/be-secure-nss.c
@@ -0,0 +1,1032 @@
+/*-------------------------------------------------------------------------
+ *
+ * be-secure-nss.c
+ *	  functions for supporting NSS as a TLS backend
+ *
+ *
+ * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ *	  src/backend/libpq/be-secure-nss.c
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#include "postgres.h"
+
+#include <sys/stat.h>
+
+/*
+ * BITS_PER_BYTE is also defined in the NSPR header fils, so we need to undef
+ * our version to avoid compiler warnings on redefinition.
+ */
+#define pg_BITS_PER_BYTE BITS_PER_BYTE
+#undef BITS_PER_BYTE
+
+/*
+ * The nspr/obsolete/protypes.h NSPR header typedefs uint64 and int64 with
+ * colliding definitions from ours, causing a much expected compiler error.
+ * The definitions are however not actually used in NSPR at all, and are only
+ * intended for what seems to be backwards compatibility for apps written
+ * against old versions of NSPR.  The following comment is in the referenced
+ * file, and was added in 1998:
+ *
+ *		This section typedefs the old 'native' types to the new PR<type>s.
+ *		These definitions are scheduled to be eliminated at the earliest
+ *		possible time. The NSPR API is implemented and documented using
+ *		the new definitions.
+ *
+ * As there is no opt-out from pulling in these typedefs, we define the guard
+ * for the file to exclude it. This is incredibly ugly, but seems to be about
+ * the only way around it.
+ */
+#define PROTYPES_H
+#include <nspr.h>
+#undef PROTYPES_H
+#include <nss.h>
+#include <prio.h>
+#include <ssl.h>
+#include <sslerr.h>
+#include <secerr.h>
+#include <sslproto.h>
+#include <prtypes.h>
+#include <pk11pub.h>
+#include <secitem.h>
+#include <secport.h>
+#include <secder.h>
+#include <certdb.h>
+#include <base64.h>
+#include <cert.h>
+#include <prerror.h>
+#include <keyhi.h>
+
+typedef struct
+{
+	enum
+	{
+		PW_NONE = 0,
+		PW_FROMFILE = 1,
+		PW_PLAINTEXT = 2,
+		PW_EXTERNAL = 3
+	} source;
+	char	   *data;
+}			secuPWData;
+
+/*
+ * Ensure that the colliding definitions match, else throw an error. In case
+ * NSPR has removed the definition for some reasone, make sure to put ours
+ * back again.
+ */
+#if defined(BITS_PER_BYTE)
+#if BITS_PER_BYTE != pg_BITS_PER_BYTE
+#error "incompatible byte widths between NSPR and postgres"
+#endif
+#else
+#define BITS_PER_BYTE pg_BITS_PER_BYTE
+#endif
+#undef pg_BITS_PER_BYTE
+
+#include "common/pg_nss.h"
+#include "lib/stringinfo.h"
+#include "libpq/libpq.h"
+#include "nodes/pg_list.h"
+#include "miscadmin.h"
+#include "storage/fd.h"
+#include "utils/guc.h"
+#include "utils/memutils.h"
+
+static PRDescIdentity pr_id;
+
+static PRIOMethods pr_iomethods;
+static NSSInitContext * nss_context = NULL;
+static SSLVersionRange desired_sslver;
+
+/*
+ * PR_ImportTCPSocket() is a private API, but very widely used, as it's the
+ * only way to make NSS use an already set up POSIX file descriptor rather
+ * than opening one itself. To quote the NSS documentation:
+ *
+ *		"In theory, code that uses PR_ImportTCPSocket may break when NSPR's
+ *		implementation changes. In practice, this is unlikely to happen because
+ *		NSPR's implementation has been stable for years and because of NSPR's
+ *		strong commitment to backward compatibility."
+ *
+ * https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSPR/Reference/PR_ImportTCPSocket
+ *
+ * The function is declared in <private/pprio.h>, but as it is a header marked
+ * private we declare it here rather than including it.
+ */
+NSPR_API(PRFileDesc *) PR_ImportTCPSocket(int);
+
+/* NSS IO layer callback overrides */
+static PRInt32 pg_ssl_read(PRFileDesc * fd, void *buf, PRInt32 amount,
+						   PRIntn flags, PRIntervalTime timeout);
+static PRInt32 pg_ssl_write(PRFileDesc * fd, const void *buf, PRInt32 amount,
+							PRIntn flags, PRIntervalTime timeout);
+/* Utility functions */
+static PRFileDesc * init_iolayer(Port *port, int loglevel);
+static uint16 ssl_protocol_version_to_nss(int v, const char *guc_name);
+
+static char *pg_SSLerrmessage(PRErrorCode errcode);
+static char *ssl_protocol_version_to_string(int v);
+static SECStatus pg_cert_auth_handler(void *arg, PRFileDesc * fd,
+									  PRBool checksig, PRBool isServer);
+static SECStatus pg_bad_cert_handler(void *arg, PRFileDesc * fd);
+
+/* ------------------------------------------------------------ */
+/*						 Public interface						*/
+/* ------------------------------------------------------------ */
+
+static char *
+ssl_passphrase_callback(PK11SlotInfo * slot, PRBool retry, void *arg)
+{
+	return pstrdup("");
+}
+
+/*
+ * be_tls_init
+ *			Initialize the nss TLS library in the postmaster
+ *
+ * The majority of the setup needs to happen in be_tls_open_server since the
+ * NSPR initialization must happen after the forking of the backend. We could
+ * potentially move some parts in under !isServerStart, but so far this is the
+ * separation chosen.
+ */
+int
+be_tls_init(bool isServerStart)
+{
+	SECStatus	status;
+	SSLVersionRange supported_sslver;
+
+	/*
+	 * Set up the connection cache for multi-processing application behavior.
+	 * If we are in ServerStart then we initialize the cache. If the server is
+	 * already started, we inherit the cache such that it can be used for
+	 * connections. Calling SSL_ConfigMPServerSIDCache sets an environment
+	 * variable which contains enough information for the forked child to know
+	 * how to access it.  Passing NULL to SSL_InheritMPServerSIDCache will
+	 * make the forked child look it up by the default name SSL_INHERITANCE,
+	 * if env vars aren't inherited then the contents of the variable can be
+	 * passed instead.
+	 */
+	if (isServerStart)
+	{
+		/*
+		 * SSLv2 and SSLv3 are disabled in this TLS backend, but when setting
+		 * up the required session cache for NSS we still must supply timeout
+		 * values for v2 and The minimum allowed value for both is 5 seconds,
+		 * so opt for that in both cases (the defaults being 100 seconds and
+		 * 24 hours).
+		 *
+		 * Passing NULL as the directory for the session cache will default to
+		 * using /tmp on UNIX and \\temp on Windows.  Deciding if we want to
+		 * keep closer control on this directory is left as a TODO.
+		 */
+		status = SSL_ConfigMPServerSIDCache(MaxConnections, 5, 5, NULL);
+		if (status != SECSuccess)
+			ereport(FATAL,
+					(errmsg("unable to set up TLS connection cache: %s",
+							pg_SSLerrmessage(PR_GetError()))));
+
+	}
+	else
+	{
+		status = SSL_InheritMPServerSIDCache(NULL);
+		if (status != SECSuccess)
+		{
+			ereport(LOG,
+					(errmsg("unable to connect to TLS connection cache: %s",
+							pg_SSLerrmessage(PR_GetError()))));
+			return -1;
+		}
+	}
+
+	if (!ssl_database || strlen(ssl_database) == 0)
+	{
+		ereport(isServerStart ? FATAL : LOG,
+				(errmsg("no certificate database specified")));
+		goto error;
+	}
+
+	/*
+	 * We check for the desired TLS version range here, even though we cannot
+	 * set it until be_open_server such that we can be compatible with how the
+	 * OpenSSL backend reports errors for incompatible range configurations.
+	 * Set either the default supported TLS version range, or the configured
+	 * range from ssl_min_protocol_version and ssl_max_protocol version. In
+	 * case the user hasn't defined the maximum allowed version we fall back
+	 * to the highest version TLS that the library supports.
+	 */
+	if (SSL_VersionRangeGetSupported(ssl_variant_stream, &supported_sslver) != SECSuccess)
+	{
+		ereport(isServerStart ? FATAL : LOG,
+				(errmsg("unable to get default protocol support from NSS")));
+		goto error;
+	}
+
+	/*
+	 * Set the fallback versions for the TLS protocol version range to a
+	 * combination of our minimal requirement and the library maximum.
+	 */
+	desired_sslver.min = SSL_LIBRARY_VERSION_TLS_1_0;
+	desired_sslver.max = supported_sslver.max;
+
+	if (ssl_min_protocol_version)
+	{
+		int			ver = ssl_protocol_version_to_nss(ssl_min_protocol_version,
+													  "ssl_min_protocol_version");
+
+		if (ver == -1)
+		{
+			ereport(isServerStart ? FATAL : LOG,
+					(errmsg("\"%s\" setting \"%s\" not supported by this build",
+							"ssl_min_protocol_version",
+							GetConfigOption("ssl_min_protocol_version",
+											false, false))));
+			goto error;
+		}
+
+		if (ver > 0)
+			desired_sslver.min = ver;
+	}
+
+	if (ssl_max_protocol_version)
+	{
+		int			ver = ssl_protocol_version_to_nss(ssl_max_protocol_version,
+													  "ssl_max_protocol_version");
+
+		if (ver == -1)
+		{
+			ereport(isServerStart ? FATAL : LOG,
+					(errmsg("\"%s\" setting \"%s\" not supported by this build",
+							"ssl_max_protocol_version",
+							GetConfigOption("ssl_max_protocol_version",
+											false, false))));
+			goto error;
+		}
+		if (ver > 0)
+			desired_sslver.max = ver;
+
+		if (ver < desired_sslver.min)
+		{
+			ereport(isServerStart ? FATAL : LOG,
+					(errmsg("could not set SSL protocol version range"),
+					 errdetail("\"%s\" cannot be higher than \"%s\"",
+							   "ssl_min_protocol_version",
+							   "ssl_max_protocol_version")));
+			goto error;
+		}
+	}
+
+	return 0;
+error:
+	return -1;
+}
+
+int
+be_tls_open_server(Port *port)
+{
+	SECStatus	status;
+	PRFileDesc *model;
+	PRFileDesc *pr_fd;
+	PRFileDesc *layer;
+	CERTCertificate *server_cert;
+	SECKEYPrivateKey *private_key;
+	CERTSignedCrl *crl;
+	SECItem		crlname;
+	secuPWData	pwdata = {PW_NONE, 0};	/* TODO: This is a bogus callback */
+	char	   *cert_database;
+	NSSInitParameters params;
+
+	/*
+	 * The NSPR documentation states that runtime initialization via PR_Init
+	 * is no longer required, as the first caller into NSPR will perform the
+	 * initialization implicitly. The documentation doesn't however clarify
+	 * from which version this is holds true, so let's perform the potentially
+	 * superfluous initialization anyways to avoid crashing on older versions
+	 * of NSPR, as there is no difference in overhead.  The NSS documentation
+	 * still states that PR_Init must be called in some way (implicitly or
+	 * explicitly).
+	 *
+	 * The below parameters are what the implicit initialization would've done
+	 * for us, and should work even for older versions where it might not be
+	 * done automatically. The last parameter, maxPTDs, is set to various
+	 * values in other codebases, but has been unused since NSPR 2.1 which was
+	 * released sometime in 1998.
+	 */
+	PR_Init(PR_USER_THREAD, PR_PRIORITY_NORMAL, 0 /* maxPTDs */ );
+
+	/*
+	 * The certificate path (configdir) must contain a valid NSS database. If
+	 * the certificate path isn't a valid directory, NSS will fall back on the
+	 * system certificate database. If the certificate path is a directory but
+	 * is empty then the initialization will fail. On the client side this can
+	 * be allowed for any sslmode but the verify-xxx ones.
+	 * https://bugzilla.redhat.com/show_bug.cgi?id=728562 For the server side
+	 * we wont allow this to fail however, as we require the certificate and
+	 * key to exist.
+	 *
+	 * The original design of NSS was for a single application to use a single
+	 * copy of it, initialized with NSS_Initialize() which isn't returning any
+	 * handle with which to refer to NSS. NSS initialization and shutdown are
+	 * global for the application, so a shutdown in another NSS enabled
+	 * library would cause NSS to be stopped for libpq as well.  The fix has
+	 * been to introduce NSS_InitContext which returns a context handle to
+	 * pass to NSS_ShutdownContext.  NSS_InitContext was introduced in NSS
+	 * 3.12, but the use of it is not very well documented.
+	 * https://bugzilla.redhat.com/show_bug.cgi?id=738456
+	 *
+	 * The InitParameters struct passed can be used to override internal
+	 * values in NSS, but the usage is not documented at all. When using
+	 * NSS_Init initializations, the values are instead set via PK11_Configure
+	 * calls so the PK11_Configure documentation can be used to glean some
+	 * details on these.
+	 *
+	 * https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS/PKCS11/Module_Specs
+	 */
+	memset(&params, '\0', sizeof(params));
+	params.length = sizeof(params);
+
+	if (!ssl_database || strlen(ssl_database) == 0)
+		ereport(FATAL,
+				(errmsg("no certificate database specified")));
+
+	cert_database = psprintf("sql:%s", ssl_database);
+	nss_context = NSS_InitContext(cert_database, "", "", "",
+								  &params,
+								  NSS_INIT_READONLY | NSS_INIT_PK11RELOAD);
+	pfree(cert_database);
+
+	if (!nss_context)
+		ereport(FATAL,
+				(errmsg("unable to read certificate database \"%s\": %s",
+						ssl_database, pg_SSLerrmessage(PR_GetError()))));
+
+	/*
+	 * Set the passphrase callback which will be used both to obtain the
+	 * passphrase from the user, as well as by NSS to obtain the phrase
+	 * repeatedly.
+	 *
+	 * TODO: Figure this out - do note that we are setting another password
+	 * callback below for cert/key as well. Need to make sense of all these.
+	 */
+	PK11_SetPasswordFunc(ssl_passphrase_callback);
+
+	/*
+	 * Import the already opened socket as we don't want to use NSPR functions
+	 * for opening the network socket due to how the PostgreSQL protocol works
+	 * with TLS connections. This function is not part of the NSPR public API,
+	 * see the comment at the top of the file for the rationale of still using
+	 * it.
+	 */
+	pr_fd = PR_ImportTCPSocket(port->sock);
+	if (!pr_fd)
+		ereport(ERROR,
+				(errmsg("unable to connect to socket")));
+
+	/*
+	 * Most of the documentation available, and implementations of, NSS/NSPR
+	 * use the PR_NewTCPSocket() function here, which has the drawback that it
+	 * can only create IPv4 sockets. Instead use PR_OpenTCPSocket() which
+	 * copes with IPv6 as well.
+	 */
+	model = PR_OpenTCPSocket(port->laddr.addr.ss_family);
+	if (!model)
+		ereport(ERROR,
+				(errmsg("unable to open socket")));
+
+	/*
+	 * Convert the NSPR socket to an SSL socket. Ensuring the success of this
+	 * operation is critical as NSS SSL_* functions may return SECSuccess on
+	 * the socket even though SSL hasn't been enabled, which introduce a risk
+	 * of silent downgrades.
+	 */
+	model = SSL_ImportFD(NULL, model);
+	if (!model)
+		ereport(ERROR,
+				(errmsg("unable to enable TLS on socket")));
+
+	/*
+	 * Configure basic settings for the connection over the SSL socket in
+	 * order to set it up as a server.
+	 */
+	if (SSL_OptionSet(model, SSL_SECURITY, PR_TRUE) != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to configure TLS connection")));
+
+	if (SSL_OptionSet(model, SSL_HANDSHAKE_AS_SERVER, PR_TRUE) != SECSuccess ||
+		SSL_OptionSet(model, SSL_HANDSHAKE_AS_CLIENT, PR_FALSE) != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to configure TLS connection as server")));
+
+	/*
+	 * SSLv2 is disabled by default, and SSLv3 will be excluded from the range
+	 * of allowed protocols further down. Since we really don't want these to
+	 * ever be enabled, let's use belts and suspenders and explicitly turn
+	 * them off as well.
+	 */
+	SSL_OptionSet(model, SSL_ENABLE_SSL2, PR_FALSE);
+	SSL_OptionSet(model, SSL_ENABLE_SSL3, PR_FALSE);
+
+#ifdef SSL_CBC_RANDOM_IV
+
+	/*
+	 * Enable protection against the BEAST attack in case the NSS server has
+	 * support for that. While SSLv3 is disabled, we may still allow TLSv1
+	 * which is affected. The option isn't documented as an SSL option, but as
+	 * an NSS environment variable.
+	 */
+	SSL_OptionSet(model, SSL_CBC_RANDOM_IV, PR_TRUE);
+#endif
+
+	/*
+	 * Configure the allowed cipher. If there are no user preferred suites,
+	 * set the domestic policy. TODO: while this code works, the set of
+	 * ciphers which can be set and still end up with a working socket is
+	 * woefully underdocumented for anything more recent than SSLv3 (the code
+	 * for TLS actually calls ssl3 functions under the hood for
+	 * SSL_CipherPrefSet), so it's unclear if this is helpful or not. Using
+	 * the policies works, but may be too coarsely grained.
+	 *
+	 * Another TODO: The SSL_ImplementedCiphers table returned with calling
+	 * SSL_GetImplementedCiphers is sorted in server preference order. Sorting
+	 * SSLCipherSuites according to the order of the ciphers therein could be
+	 * a way to implement ssl_prefer_server_ciphers - if we at all want to use
+	 * cipher selection for NSS like how we do it for OpenSSL that is.
+	 */
+
+	/*
+	 * If no ciphers are specified, we use the domestic policy
+	 */
+	if (!SSLCipherSuites || strlen(SSLCipherSuites) == 0)
+	{
+		status = NSS_SetDomesticPolicy();
+		if (status != SECSuccess)
+			ereport(ERROR,
+					(errmsg("unable to set cipher policy: %s",
+							pg_SSLerrmessage(PR_GetError()))));
+	}
+	else
+	{
+		char	   *ciphers,
+				   *c;
+
+		char	   *sep = ":;, ";
+		PRUint16	ciphercode;
+		const		PRUint16 *nss_ciphers;
+
+		/*
+		 * If the user has specified a set of preferred cipher suites we start
+		 * by turning off all the existing suites to avoid the risk of down-
+		 * grades to a weaker cipher than expected.
+		 */
+		nss_ciphers = SSL_GetImplementedCiphers();
+		for (int i = 0; i < SSL_GetNumImplementedCiphers(); i++)
+			SSL_CipherPrefSet(model, nss_ciphers[i], PR_FALSE);
+
+		ciphers = pstrdup(SSLCipherSuites);
+
+		for (c = strtok(ciphers, sep); c; c = strtok(NULL, sep))
+		{
+			ciphercode = pg_find_cipher(c);
+			if (ciphercode != INVALID_CIPHER)
+			{
+				status = SSL_CipherPrefSet(model, ciphercode, PR_TRUE);
+				if (status != SECSuccess)
+					ereport(ERROR,
+							(errmsg("invalid cipher-suite specified: %s", c)));
+			}
+		}
+
+		pfree(ciphers);
+	}
+
+	if (SSL_VersionRangeSet(model, &desired_sslver) != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to set requested SSL protocol version range")));
+
+	/*
+	 * Set up the custom IO layer.
+	 */
+	layer = init_iolayer(port, ERROR);
+	if (!layer)
+		goto error;
+
+	/* Store the Port as private data available in callbacks */
+	layer->secret = (void *) port;
+
+	if (PR_PushIOLayer(pr_fd, PR_TOP_IO_LAYER, layer) != PR_SUCCESS)
+	{
+		PR_Close(layer);
+		ereport(ERROR,
+				(errmsg("unable to push IO layer")));
+	}
+
+	/* TODO: set the postgres password callback param as callback function */
+	server_cert = PK11_FindCertFromNickname(ssl_cert_file, &pwdata /* password callback */ );
+	if (!server_cert)
+		ereport(ERROR,
+				(errmsg("unable to find certificate for \"%s\": %s",
+						ssl_cert_file, pg_SSLerrmessage(PR_GetError()))));
+
+	/* TODO: set the postgres password callback param as callback function */
+	private_key = PK11_FindKeyByAnyCert(server_cert, &pwdata /* password callback */ );
+	if (!private_key)
+		ereport(ERROR,
+				(errmsg("unable to find private key for \"%s\": %s",
+						ssl_cert_file, pg_SSLerrmessage(PR_GetError()))));
+
+	/*
+	 * NSS doesn't use CRL files on disk, so we use the ssl_crl_file guc to
+	 * contain the CRL nickname for the current server certificate in the NSS
+	 * certificate database. The main difference from the OpenSSL backend is
+	 * that NSS will use the CRL regardless, but being able to make sure the
+	 * CRL is loaded seems like a good feature.
+	 */
+	if (ssl_crl_file[0])
+	{
+		SECITEM_CopyItem(NULL, &crlname, &server_cert->derSubject);
+		crl = SEC_FindCrlByName(CERT_GetDefaultCertDB(), &crlname, SEC_CRL_TYPE);
+		if (!crl)
+			ereport(ERROR,
+					(errmsg("specified CRL not found in database")));
+		SEC_DestroyCrl(crl);
+	}
+
+	/*
+	 * Finally we must configure the socket for being a server by setting the
+	 * certificate and key.
+	 */
+	status = SSL_ConfigSecureServer(model, server_cert, private_key, kt_rsa);
+	if (status != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to configure secure server: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+	status = SSL_ConfigServerCert(model, server_cert, private_key, NULL, 0);
+	if (status != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to configure server for TLS server connections: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+
+	ssl_loaded_verify_locations = true;
+
+	/*
+	 * At this point, we no longer have use for the certificate and private
+	 * key as they have been copied into the context by NSS. Destroy our
+	 * copies explicitly to clean out the memory as best we can.
+	 */
+	CERT_DestroyCertificate(server_cert);
+	SECKEY_DestroyPrivateKey(private_key);
+
+	status = SSL_AuthCertificateHook(model, pg_cert_auth_handler, (void *) port);
+	if (status != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to install authcert hook: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+	SSL_BadCertHook(model, pg_bad_cert_handler, (void *) port);
+	SSL_OptionSet(model, SSL_REQUEST_CERTIFICATE, PR_TRUE);
+	SSL_OptionSet(model, SSL_REQUIRE_CERTIFICATE, PR_FALSE);
+
+	port->pr_fd = SSL_ImportFD(model, pr_fd);
+	if (!port->pr_fd)
+		ereport(ERROR,
+				(errmsg("unable to initialize")));
+
+	PR_Close(model);
+
+	/*
+	 * Force a handshake on the next I/O request, the second parameter means
+	 * that we are a server, PR_FALSE would indicate being a client. NSPR
+	 * requires us to call SSL_ResetHandshake since we imported an already
+	 * established socket.
+	 */
+	status = SSL_ResetHandshake(port->pr_fd, PR_TRUE);
+	if (status != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to initiate handshake: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+	status = SSL_ForceHandshake(port->pr_fd);
+	if (status != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to handshake: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+
+	port->ssl_in_use = true;
+	return 0;
+
+error:
+	return 1;
+}
+
+ssize_t
+be_tls_read(Port *port, void *ptr, size_t len, int *waitfor)
+{
+	ssize_t		n_read;
+	PRErrorCode err;
+
+	n_read = PR_Read(port->pr_fd, ptr, len);
+
+	if (n_read < 0)
+	{
+		err = PR_GetError();
+
+		/* XXX: This logic seems potentially bogus? */
+		if (err == PR_WOULD_BLOCK_ERROR)
+			*waitfor = WL_SOCKET_READABLE;
+		else
+			*waitfor = WL_SOCKET_WRITEABLE;
+	}
+
+	return n_read;
+}
+
+ssize_t
+be_tls_write(Port *port, void *ptr, size_t len, int *waitfor)
+{
+	ssize_t		n_write;
+	PRErrorCode err;
+
+	n_write = PR_Send(port->pr_fd, ptr, len, 0, PR_INTERVAL_NO_WAIT);
+
+	if (n_write < 0)
+	{
+		err = PR_GetError();
+
+		if (err == PR_WOULD_BLOCK_ERROR)
+			*waitfor = WL_SOCKET_WRITEABLE;
+		else
+			*waitfor = WL_SOCKET_READABLE;
+	}
+
+	return n_write;
+}
+
+void
+be_tls_close(Port *port)
+{
+	if (!port)
+		return;
+
+	if (port->peer_cn)
+	{
+		SSL_InvalidateSession(port->pr_fd);
+		pfree(port->peer_cn);
+		port->peer_cn = NULL;
+	}
+
+	PR_Close(port->pr_fd);
+	port->pr_fd = NULL;
+	port->ssl_in_use = false;
+
+	if (nss_context)
+	{
+		NSS_ShutdownContext(nss_context);
+		nss_context = NULL;
+	}
+}
+
+void
+be_tls_destroy(void)
+{
+	/*
+	 * It reads a bit odd to clear a session cache when we are destroying the
+	 * context altogether, but if the session cache isn't cleared before
+	 * shutting down the context it will fail with SEC_ERROR_BUSY.
+	 */
+	SSL_ClearSessionCache();
+}
+
+int
+be_tls_get_cipher_bits(Port *port)
+{
+	SECStatus	status;
+	SSLChannelInfo channel;
+	SSLCipherSuiteInfo suite;
+
+	status = SSL_GetChannelInfo(port->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+		goto error;
+
+	status = SSL_GetCipherSuiteInfo(channel.cipherSuite, &suite, sizeof(suite));
+	if (status != SECSuccess)
+		goto error;
+
+	return suite.effectiveKeyBits;
+
+error:
+	ereport(WARNING,
+			(errmsg("unable to extract TLS session information: %s",
+					pg_SSLerrmessage(PR_GetError()))));
+	return 0;
+}
+
+/*
+ * be_tls_get_compression
+ *
+ * NSS disabled support for TLS compression in version 3.33 and removed the
+ * code in a subsequent release. The API for retrieving information about
+ * compression as well as enabling it is kept for backwards compatibility, but
+ * we don't need to consult it since it was only available for SSLv3 which we
+ * don't support.
+ *
+ * https://bugzilla.mozilla.org/show_bug.cgi?id=1409587
+ */
+bool
+be_tls_get_compression(Port *port)
+{
+	return false;
+}
+
+const char *
+be_tls_get_version(Port *port)
+{
+	SECStatus	status;
+	SSLChannelInfo channel;
+
+	status = SSL_GetChannelInfo(port->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+	{
+		ereport(WARNING,
+				(errmsg("unable to extract TLS session information: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+		return NULL;
+	}
+
+	return ssl_protocol_version_to_string(channel.protocolVersion);
+}
+
+const char *
+be_tls_get_cipher(Port *port)
+{
+	SECStatus	status;
+	SSLChannelInfo channel;
+	SSLCipherSuiteInfo suite;
+
+	status = SSL_GetChannelInfo(port->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+		goto error;
+
+	status = SSL_GetCipherSuiteInfo(channel.cipherSuite, &suite, sizeof(suite));
+	if (status != SECSuccess)
+		goto error;
+
+	return suite.cipherSuiteName;
+
+error:
+	ereport(WARNING,
+			(errmsg("unable to extract TLS session information: %s",
+					pg_SSLerrmessage(PR_GetError()))));
+	return NULL;
+}
+
+void
+be_tls_get_peer_subject_name(Port *port, char *ptr, size_t len)
+{
+	CERTCertificate *certificate;
+
+	certificate = SSL_PeerCertificate(port->pr_fd);
+	if (certificate)
+		strlcpy(ptr, CERT_NameToAscii(&certificate->subject), len);
+	else
+		ptr[0] = '\0';
+}
+
+void
+be_tls_get_peer_issuer_name(Port *port, char *ptr, size_t len)
+{
+	CERTCertificate *certificate;
+
+	certificate = SSL_PeerCertificate(port->pr_fd);
+	if (certificate)
+		strlcpy(ptr, CERT_NameToAscii(&certificate->issuer), len);
+	else
+		ptr[0] = '\0';
+}
+
+void
+be_tls_get_peer_serial(Port *port, char *ptr, size_t len)
+{
+	CERTCertificate *certificate;
+
+	certificate = SSL_PeerCertificate(port->pr_fd);
+	if (certificate)
+		snprintf(ptr, len, "%li", DER_GetInteger(&(certificate->serialNumber)));
+	else
+		ptr[0] = '\0';
+}
+
+static SECStatus
+pg_bad_cert_handler(void *arg, PRFileDesc * fd)
+{
+	Port	   *port = (Port *) arg;
+
+	port->peer_cert_valid = false;
+	return SECFailure;
+}
+
+static SECStatus
+pg_cert_auth_handler(void *arg, PRFileDesc * fd, PRBool checksig, PRBool isServer)
+{
+	SECStatus	status;
+	Port	   *port = (Port *) arg;
+	CERTCertificate *cert;
+	char	   *peer_cn;
+	int			len;
+
+	status = SSL_AuthCertificate(CERT_GetDefaultCertDB(), port->pr_fd, checksig, PR_TRUE);
+	if (status == SECSuccess)
+	{
+		cert = SSL_PeerCertificate(port->pr_fd);
+		len = strlen(cert->subjectName);
+		peer_cn = MemoryContextAllocZero(TopMemoryContext, len + 1);
+		if (strncmp(cert->subjectName, "CN=", 3) == 0)
+			strlcpy(peer_cn, cert->subjectName + strlen("CN="), len + 1);
+		else
+			strlcpy(peer_cn, cert->subjectName, len + 1);
+		CERT_DestroyCertificate(cert);
+
+		port->peer_cn = peer_cn;
+		port->peer_cert_valid = true;
+	}
+
+	return status;
+}
+
+/* ------------------------------------------------------------ */
+/*						Internal functions						*/
+/* ------------------------------------------------------------ */
+
+static PRInt32
+pg_ssl_read(PRFileDesc * fd, void *buf, PRInt32 amount, PRIntn flags,
+			PRIntervalTime timeout)
+{
+	PRRecvFN	read_fn;
+	PRInt32		n_read;
+
+	read_fn = fd->lower->methods->recv;
+	n_read = read_fn(fd->lower, buf, amount, flags, timeout);
+
+	return n_read;
+}
+
+static PRInt32
+pg_ssl_write(PRFileDesc * fd, const void *buf, PRInt32 amount, PRIntn flags,
+			 PRIntervalTime timeout)
+{
+	PRSendFN	send_fn;
+	PRInt32		n_write;
+
+	send_fn = fd->lower->methods->send;
+	n_write = send_fn(fd->lower, buf, amount, flags, timeout);
+
+	return n_write;
+}
+
+static PRFileDesc *
+init_iolayer(Port *port, int loglevel)
+{
+	const		PRIOMethods *default_methods;
+	PRFileDesc *layer;
+
+	/*
+	 * Start by initializing our layer with all the default methods so that we
+	 * can selectively override the ones we want while still ensuring that we
+	 * have a complete layer specification.
+	 */
+	default_methods = PR_GetDefaultIOMethods();
+	memcpy(&pr_iomethods, default_methods, sizeof(PRIOMethods));
+
+	pr_iomethods.recv = pg_ssl_read;
+	pr_iomethods.send = pg_ssl_write;
+
+	/*
+	 * Each IO layer must be identified by a unique name, where uniqueness is
+	 * per connection. Each connection in a postgres cluster can generate the
+	 * identity from the same string as they will create their IO layers on
+	 * different sockets. Only one layer per socket can have the same name.
+	 */
+	pr_id = PR_GetUniqueIdentity("PostgreSQL");
+	if (pr_id == PR_INVALID_IO_LAYER)
+	{
+		ereport(loglevel,
+				(errmsg("out of memory when setting up TLS connection")));
+		return NULL;
+	}
+
+	/*
+	 * Create the actual IO layer as a stub such that it can be pushed onto
+	 * the layer stack. The step via a stub is required as we define custom
+	 * callbacks.
+	 */
+	layer = PR_CreateIOLayerStub(pr_id, &pr_iomethods);
+	if (!layer)
+	{
+		ereport(loglevel,
+				(errmsg("unable to create NSS I/O layer")));
+		return NULL;
+	}
+
+	return layer;
+}
+
+static char *
+ssl_protocol_version_to_string(int v)
+{
+	switch (v)
+	{
+			/* SSL v2 and v3 are not supported */
+		case SSL_LIBRARY_VERSION_2:
+		case SSL_LIBRARY_VERSION_3_0:
+			Assert(false);
+			break;
+
+		case SSL_LIBRARY_VERSION_TLS_1_0:
+			return pstrdup("TLSv1.0");
+		case SSL_LIBRARY_VERSION_TLS_1_1:
+			return pstrdup("TLSv1.1");
+		case SSL_LIBRARY_VERSION_TLS_1_2:
+			return pstrdup("TLSv1.2");
+		case SSL_LIBRARY_VERSION_TLS_1_3:
+			return pstrdup("TLSv1.3");
+	}
+
+	return pstrdup("unknown");
+}
+
+
+/*
+ * ssl_protocol_version_to_nss
+ *			Translate PostgreSQL TLS version to NSS version
+ *
+ * Returns zero in case the requested TLS version is undefined (PG_ANY) and
+ * should be set by the caller, or -1 on failure.
+ */
+static uint16
+ssl_protocol_version_to_nss(int v, const char *guc_name)
+{
+	switch (v)
+	{
+			/*
+			 * There is no SSL_LIBRARY_ macro defined in NSS with the value
+			 * zero, so we use this to signal the caller that the highest
+			 * useful version should be set on the connection.
+			 */
+		case PG_TLS_ANY:
+			return 0;
+
+			/*
+			 * No guard is required here as there are no versions of NSS
+			 * without support for TLS1.
+			 */
+		case PG_TLS1_VERSION:
+			return SSL_LIBRARY_VERSION_TLS_1_0;
+		case PG_TLS1_1_VERSION:
+#ifdef SSL_LIBRARY_VERSION_TLS_1_1
+			return SSL_LIBRARY_VERSION_TLS_1_1;
+#else
+			break;
+#endif
+		case PG_TLS1_2_VERSION:
+#ifdef SSL_LIBRARY_VERSION_TLS_1_2
+			return SSL_LIBRARY_VERSION_TLS_1_2;
+#else
+			break;
+#endif
+		case PG_TLS1_3_VERSION:
+#ifdef SSL_LIBRARY_VERSION_TLS_1_3
+			return SSL_LIBRARY_VERSION_TLS_1_3;
+#else
+			break;
+#endif
+		default:
+			break;
+	}
+
+	return -1;
+}
+
+/*
+ * pg_SSLerrmessage
+ *		Create and return a human readable error message given
+ *		the specified error code
+ *
+ * PR_ErrorToName only converts the enum identifier of the error to string,
+ * but that can be quite useful for debugging (and in case PR_ErrorToString is
+ * unable to render a message then we at least have something).
+ */
+static char *
+pg_SSLerrmessage(PRErrorCode errcode)
+{
+	char		error[128];
+	int			ret;
+
+	/* TODO: this should perhaps use a StringInfo instead.. */
+	ret = pg_snprintf(error, sizeof(error), "%s (%s)",
+					  PR_ErrorToString(errcode, PR_LANGUAGE_I_DEFAULT),
+					  PR_ErrorToName(errcode));
+	if (ret)
+		return pstrdup(error);
+
+	return pstrdup(_("unknown TLS error"));
+}
diff --git a/src/backend/libpq/be-secure-openssl.c b/src/backend/libpq/be-secure-openssl.c
index 8b21ff4065..5962cffc0c 100644
--- a/src/backend/libpq/be-secure-openssl.c
+++ b/src/backend/libpq/be-secure-openssl.c
@@ -1298,15 +1298,28 @@ X509_NAME_to_cstring(X509_NAME *name)
 	char	   *dp;
 	char	   *result;
 
+	if (membuf == NULL)
+		ereport(ERROR,
+				(errcode(ERRCODE_OUT_OF_MEMORY),
+				 errmsg("failed to create BIO")));
+
 	(void) BIO_set_close(membuf, BIO_CLOSE);
 	for (i = 0; i < count; i++)
 	{
 		e = X509_NAME_get_entry(name, i);
 		nid = OBJ_obj2nid(X509_NAME_ENTRY_get_object(e));
+		if (nid == NID_undef)
+			ereport(ERROR,
+					(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
+					 errmsg("could not get NID for ASN1_OBJECT object")));
 		v = X509_NAME_ENTRY_get_data(e);
 		field_name = OBJ_nid2sn(nid);
 		if (!field_name)
 			field_name = OBJ_nid2ln(nid);
+		if (field_name == NULL)
+			ereport(ERROR,
+					(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
+					 errmsg("could not convert NID %d to an ASN1_OBJECT structure", nid)));
 		BIO_printf(membuf, "/%s=", field_name);
 		ASN1_STRING_print_ex(membuf, v,
 							 ((ASN1_STRFLGS_RFC2253 & ~ASN1_STRFLGS_ESC_MSB)
@@ -1322,7 +1335,8 @@ X509_NAME_to_cstring(X509_NAME *name)
 	result = pstrdup(dp);
 	if (dp != sp)
 		pfree(dp);
-	BIO_free(membuf);
+	if (BIO_free(membuf) != 1)
+		elog(ERROR, "could not free OpenSSL BIO structure");
 
 	return result;
 }
diff --git a/src/backend/libpq/be-secure.c b/src/backend/libpq/be-secure.c
index 2ae507a902..f39977b80c 100644
--- a/src/backend/libpq/be-secure.c
+++ b/src/backend/libpq/be-secure.c
@@ -49,6 +49,9 @@ bool		ssl_passphrase_command_supports_reload;
 #ifdef USE_SSL
 bool		ssl_loaded_verify_locations = false;
 #endif
+#ifdef USE_NSS
+char	   *ssl_database;
+#endif
 
 /* GUC variable controlling SSL cipher list */
 char	   *SSLCipherSuites = NULL;
diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c
index de87ad6ef7..33c3eebf48 100644
--- a/src/backend/utils/misc/guc.c
+++ b/src/backend/utils/misc/guc.c
@@ -4262,7 +4262,11 @@ static struct config_string ConfigureNamesString[] =
 		},
 		&ssl_library,
 #ifdef USE_SSL
+#if defined(USE_OPENSSL)
 		"OpenSSL",
+#elif defined(USE_NSS)
+		"NSS",
+#endif
 #else
 		"",
 #endif
@@ -4320,6 +4324,18 @@ static struct config_string ConfigureNamesString[] =
 		check_canonical_path, assign_pgstat_temp_directory, NULL
 	},
 
+#ifdef USE_NSS
+	{
+		{"ssl_database", PGC_SIGHUP, CONN_AUTH_SSL,
+			gettext_noop("Location of the NSS certificate database."),
+			NULL
+		},
+		&ssl_database,
+		"",
+		NULL, NULL, NULL
+	},
+#endif
+
 	{
 		{"synchronous_standby_names", PGC_SIGHUP, REPLICATION_PRIMARY,
 			gettext_noop("Number of synchronous standbys and list of names of potential synchronous ones."),
@@ -4348,8 +4364,10 @@ static struct config_string ConfigureNamesString[] =
 			GUC_SUPERUSER_ONLY
 		},
 		&SSLCipherSuites,
-#ifdef USE_OPENSSL
+#if defined(USE_OPENSSL)
 		"HIGH:MEDIUM:+3DES:!aNULL",
+#elif defined (USE_NSS)
+		"",
 #else
 		"none",
 #endif
diff --git a/src/include/common/pg_nss.h b/src/include/common/pg_nss.h
new file mode 100644
index 0000000000..74298c8bb1
--- /dev/null
+++ b/src/include/common/pg_nss.h
@@ -0,0 +1,141 @@
+/*-------------------------------------------------------------------------
+ *
+ * pg_nss.h
+ *	  Support for NSS as a TLS backend
+ *
+ * These definitions are used by both frontend and backend code.
+ *
+ * Copyright (c) 2020, PostgreSQL Global Development Group
+ *
+ * IDENTIFICATION
+ *        src/include/common/pg_nss.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef PG_NSS_H
+#define PG_NSS_H
+
+#ifdef USE_NSS
+
+#include <sslproto.h>
+
+PRUint16	pg_find_cipher(char *name);
+
+typedef struct
+{
+	const char *name;
+	PRUint16	number;
+}			NSSCiphers;
+
+#define INVALID_CIPHER	0xFFFF
+
+/*
+ * This list is a partial copy of the ciphers in NSS files lib/ssl/sslproto.h
+ * in order to provide a human readable version of the ciphers. It would be
+ * nice to not have to have this, but NSS doesn't provide any API addressing
+ * the ciphers by name. TODO: do we want more of the ciphers, or perhaps less?
+ */
+static const NSSCiphers NSS_CipherList[] = {
+
+	{"TLS_NULL_WITH_NULL_NULL", TLS_NULL_WITH_NULL_NULL},
+
+	{"TLS_RSA_WITH_NULL_MD5", TLS_RSA_WITH_NULL_MD5},
+	{"TLS_RSA_WITH_NULL_SHA", TLS_RSA_WITH_NULL_SHA},
+	{"TLS_RSA_WITH_RC4_128_MD5", TLS_RSA_WITH_RC4_128_MD5},
+	{"TLS_RSA_WITH_RC4_128_SHA", TLS_RSA_WITH_RC4_128_SHA},
+	{"TLS_RSA_WITH_IDEA_CBC_SHA", TLS_RSA_WITH_IDEA_CBC_SHA},
+	{"TLS_RSA_WITH_DES_CBC_SHA", TLS_RSA_WITH_DES_CBC_SHA},
+	{"TLS_RSA_WITH_3DES_EDE_CBC_SHA", TLS_RSA_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_DH_DSS_WITH_DES_CBC_SHA", TLS_DH_DSS_WITH_DES_CBC_SHA},
+	{"TLS_DH_DSS_WITH_3DES_EDE_CBC_SHA", TLS_DH_DSS_WITH_3DES_EDE_CBC_SHA},
+	{"TLS_DH_RSA_WITH_DES_CBC_SHA", TLS_DH_RSA_WITH_DES_CBC_SHA},
+	{"TLS_DH_RSA_WITH_3DES_EDE_CBC_SHA", TLS_DH_RSA_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_DHE_DSS_WITH_DES_CBC_SHA", TLS_DHE_DSS_WITH_DES_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_3DES_EDE_CBC_SHA", TLS_DHE_DSS_WITH_3DES_EDE_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_DES_CBC_SHA", TLS_DHE_RSA_WITH_DES_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA", TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_DH_anon_WITH_RC4_128_MD5", TLS_DH_anon_WITH_RC4_128_MD5},
+	{"TLS_DH_anon_WITH_DES_CBC_SHA", TLS_DH_anon_WITH_DES_CBC_SHA},
+	{"TLS_DH_anon_WITH_3DES_EDE_CBC_SHA", TLS_DH_anon_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_RSA_WITH_AES_128_CBC_SHA", TLS_RSA_WITH_AES_128_CBC_SHA},
+	{"TLS_DH_DSS_WITH_AES_128_CBC_SHA", TLS_DH_DSS_WITH_AES_128_CBC_SHA},
+	{"TLS_DH_RSA_WITH_AES_128_CBC_SHA", TLS_DH_RSA_WITH_AES_128_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_AES_128_CBC_SHA", TLS_DHE_DSS_WITH_AES_128_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_AES_128_CBC_SHA", TLS_DHE_RSA_WITH_AES_128_CBC_SHA},
+	{"TLS_DH_anon_WITH_AES_128_CBC_SHA", TLS_DH_anon_WITH_AES_128_CBC_SHA},
+
+	{"TLS_RSA_WITH_AES_256_CBC_SHA", TLS_RSA_WITH_AES_256_CBC_SHA},
+	{"TLS_DH_DSS_WITH_AES_256_CBC_SHA", TLS_DH_DSS_WITH_AES_256_CBC_SHA},
+	{"TLS_DH_RSA_WITH_AES_256_CBC_SHA", TLS_DH_RSA_WITH_AES_256_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_AES_256_CBC_SHA", TLS_DHE_DSS_WITH_AES_256_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_AES_256_CBC_SHA", TLS_DHE_RSA_WITH_AES_256_CBC_SHA},
+	{"TLS_DH_anon_WITH_AES_256_CBC_SHA", TLS_DH_anon_WITH_AES_256_CBC_SHA},
+	{"TLS_RSA_WITH_NULL_SHA256", TLS_RSA_WITH_NULL_SHA256},
+	{"TLS_RSA_WITH_AES_128_CBC_SHA256", TLS_RSA_WITH_AES_128_CBC_SHA256},
+	{"TLS_RSA_WITH_AES_256_CBC_SHA256", TLS_RSA_WITH_AES_256_CBC_SHA256},
+
+	{"TLS_DHE_DSS_WITH_AES_128_CBC_SHA256", TLS_DHE_DSS_WITH_AES_128_CBC_SHA256},
+	{"TLS_RSA_WITH_CAMELLIA_128_CBC_SHA", TLS_RSA_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DH_DSS_WITH_CAMELLIA_128_CBC_SHA", TLS_DH_DSS_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DH_RSA_WITH_CAMELLIA_128_CBC_SHA", TLS_DH_RSA_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_CAMELLIA_128_CBC_SHA", TLS_DHE_DSS_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA", TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DH_anon_WITH_CAMELLIA_128_CBC_SHA", TLS_DH_anon_WITH_CAMELLIA_128_CBC_SHA},
+
+	{"TLS_DHE_DSS_WITH_RC4_128_SHA", TLS_DHE_DSS_WITH_RC4_128_SHA},
+	{"TLS_DHE_RSA_WITH_AES_128_CBC_SHA256", TLS_DHE_RSA_WITH_AES_128_CBC_SHA256},
+	{"TLS_DHE_DSS_WITH_AES_256_CBC_SHA256", TLS_DHE_DSS_WITH_AES_256_CBC_SHA256},
+	{"TLS_DHE_RSA_WITH_AES_256_CBC_SHA256", TLS_DHE_RSA_WITH_AES_256_CBC_SHA256},
+
+	{"TLS_RSA_WITH_CAMELLIA_256_CBC_SHA", TLS_RSA_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DH_DSS_WITH_CAMELLIA_256_CBC_SHA", TLS_DH_DSS_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DH_RSA_WITH_CAMELLIA_256_CBC_SHA", TLS_DH_RSA_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_CAMELLIA_256_CBC_SHA", TLS_DHE_DSS_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA", TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DH_anon_WITH_CAMELLIA_256_CBC_SHA", TLS_DH_anon_WITH_CAMELLIA_256_CBC_SHA},
+
+	{"TLS_RSA_WITH_SEED_CBC_SHA", TLS_RSA_WITH_SEED_CBC_SHA},
+
+	{"TLS_RSA_WITH_AES_128_GCM_SHA256", TLS_RSA_WITH_AES_128_GCM_SHA256},
+	{"TLS_RSA_WITH_AES_256_GCM_SHA384", TLS_RSA_WITH_AES_256_GCM_SHA384},
+	{"TLS_DHE_RSA_WITH_AES_128_GCM_SHA256", TLS_DHE_RSA_WITH_AES_128_GCM_SHA256},
+	{"TLS_DHE_RSA_WITH_AES_256_GCM_SHA384", TLS_DHE_RSA_WITH_AES_256_GCM_SHA384},
+	{"TLS_DHE_DSS_WITH_AES_128_GCM_SHA256", TLS_DHE_DSS_WITH_AES_128_GCM_SHA256},
+	{"TLS_DHE_DSS_WITH_AES_256_GCM_SHA384", TLS_DHE_DSS_WITH_AES_256_GCM_SHA384},
+
+	{"TLS_AES_128_GCM_SHA256", TLS_AES_128_GCM_SHA256},
+	{"TLS_AES_256_GCM_SHA384", TLS_AES_256_GCM_SHA384},
+	{"TLS_CHACHA20_POLY1305_SHA256", TLS_CHACHA20_POLY1305_SHA256},
+	{NULL, 0}
+};
+
+/*
+ * pg_find_cipher
+ *			Translate an NSS ciphername to the cipher code
+ *
+ * Searches the configured ciphers for the corresponding cipher code to the
+ * name. Search is performed case insensitive.
+ */
+PRUint16
+pg_find_cipher(char *name)
+{
+	const		NSSCiphers *cipher_list = NSS_CipherList;
+
+	while (cipher_list->name)
+	{
+		if (pg_strcasecmp(cipher_list->name, name) == 0)
+			return cipher_list->number;
+
+		cipher_list++;
+	}
+
+	return 0xFFFF;
+}
+
+#endif							/* USE_NSS */
+
+#endif							/* PG_NSS_H */
diff --git a/src/include/libpq/libpq-be.h b/src/include/libpq/libpq-be.h
index 179ebaa104..6211510fab 100644
--- a/src/include/libpq/libpq-be.h
+++ b/src/include/libpq/libpq-be.h
@@ -192,13 +192,18 @@ typedef struct Port
 	bool		peer_cert_valid;
 
 	/*
-	 * OpenSSL structures. (Keep these last so that the locations of other
-	 * fields are the same whether or not you build with OpenSSL.)
+	 * SSL backend specific structures. (Keep these last so that the locations
+	 * of other fields are the same whether or not you build with SSL
+	 * enabled.)
 	 */
 #ifdef USE_OPENSSL
 	SSL		   *ssl;
 	X509	   *peer;
 #endif
+
+#ifdef USE_NSS
+	void	   *pr_fd;
+#endif
 } Port;
 
 #ifdef USE_SSL
diff --git a/src/include/libpq/libpq.h b/src/include/libpq/libpq.h
index b1152475ac..298d87ecae 100644
--- a/src/include/libpq/libpq.h
+++ b/src/include/libpq/libpq.h
@@ -88,6 +88,9 @@ extern PGDLLIMPORT bool ssl_passphrase_command_supports_reload;
 #ifdef USE_SSL
 extern bool ssl_loaded_verify_locations;
 #endif
+#ifdef USE_NSS
+extern char *ssl_database;
+#endif
 
 extern int	secure_initialize(bool isServerStart);
 extern bool secure_loaded_verify_locations(void);
diff --git a/src/include/pg_config.h.in b/src/include/pg_config.h.in
index fb270df678..31f808398c 100644
--- a/src/include/pg_config.h.in
+++ b/src/include/pg_config.h.in
@@ -893,6 +893,9 @@
 /* Define to 1 to build with PAM support. (--with-pam) */
 #undef USE_PAM
 
+/* Define to build with NSS support (--with-nss) */
+#undef USE_NSS
+
 /* Define to 1 to use software CRC-32C implementation (slicing-by-8). */
 #undef USE_SLICING_BY_8_CRC32C
 
diff --git a/src/include/pg_config_manual.h b/src/include/pg_config_manual.h
index 705dc69c06..c28b84126d 100644
--- a/src/include/pg_config_manual.h
+++ b/src/include/pg_config_manual.h
@@ -176,10 +176,9 @@
 
 /*
  * USE_SSL code should be compiled only when compiling with an SSL
- * implementation.  (Currently, only OpenSSL is supported, but we might add
- * more implementations in the future.)
+ * implementation.
  */
-#ifdef USE_OPENSSL
+#if defined(USE_OPENSSL) || defined(USE_NSS)
 #define USE_SSL
 #endif
 
diff --git a/src/interfaces/libpq/Makefile b/src/interfaces/libpq/Makefile
index d4919970f8..97821fb39b 100644
--- a/src/interfaces/libpq/Makefile
+++ b/src/interfaces/libpq/Makefile
@@ -57,6 +57,10 @@ OBJS += \
 	fe-secure-gssapi.o
 endif
 
+ifeq ($(with_nss), yes)
+OBJS += fe-secure-nss.o
+endif
+
 ifeq ($(PORTNAME), cygwin)
 override shlib = cyg$(NAME)$(DLSUFFIX)
 endif
diff --git a/src/interfaces/libpq/fe-connect.c b/src/interfaces/libpq/fe-connect.c
index 7bee9dd201..2814eb8ddd 100644
--- a/src/interfaces/libpq/fe-connect.c
+++ b/src/interfaces/libpq/fe-connect.c
@@ -354,6 +354,10 @@ static const internalPQconninfoOption PQconninfoOptions[] = {
 		"Target-Session-Attrs", "", 11, /* sizeof("read-write") = 11 */
 	offsetof(struct pg_conn, target_session_attrs)},
 
+	{"cert_database", NULL, NULL, NULL,
+		"CertificateDatabase", "", 64,
+	offsetof(struct pg_conn, cert_database)},
+
 	/* Terminating entry --- MUST BE LAST */
 	{NULL, NULL, NULL, NULL,
 	NULL, NULL, 0}
diff --git a/src/interfaces/libpq/fe-secure-nss.c b/src/interfaces/libpq/fe-secure-nss.c
new file mode 100644
index 0000000000..6401949136
--- /dev/null
+++ b/src/interfaces/libpq/fe-secure-nss.c
@@ -0,0 +1,975 @@
+/*-------------------------------------------------------------------------
+ *
+ * fe-secure-nss.c
+ *	  functions for supporting NSS as a TLS backend for frontend libpq
+ *
+ * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ *	  src/interfaces/libpq/fe-secure-nss.c
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#include "postgres_fe.h"
+
+#include "libpq-fe.h"
+#include "fe-auth.h"
+#include "libpq-int.h"
+
+/*
+ * BITS_PER_BYTE is also defined in the NSPR header fils, so we need to undef
+ * our version to avoid compiler warnings on redefinition.
+ */
+#define pg_BITS_PER_BYTE BITS_PER_BYTE
+#undef BITS_PER_BYTE
+
+/*
+ * The nspr/obsolete/protypes.h NSPR header typedefs uint64 and int64 with
+ * colliding definitions from ours, causing a much expected compiler error.
+ * The definitions are however not actually used in NSPR at all, and are only
+ * intended for what seems to be backwards compatibility for apps written
+ * against old versions of NSPR.  The following comment is in the referenced
+ * file, and was added in 1998:
+ *
+ *		This section typedefs the old 'native' types to the new PR<type>s.
+ *		These definitions are scheduled to be eliminated at the earliest
+ *		possible time. The NSPR API is implemented and documented using
+ *		the new definitions.
+ *
+ * As there is no opt-out from pulling in these typedefs, we define the guard
+ * for the file to exclude it. This is incredibly ugly, but seems to be about
+ * the only way around it.
+ */
+#define PROTYPES_H
+#include <nspr.h>
+#undef PROTYPES_H
+#include <nss.h>
+#include <ssl.h>
+#include <sslproto.h>
+#include <pk11func.h>
+#include <prerror.h>
+#include <prinit.h>
+#include <prio.h>
+#include <secerr.h>
+#include <secmod.h>
+
+/*
+ * Ensure that the colliding definitions match, else throw an error. In case
+ * NSPR remove the definition in a future version (however unlikely that may
+ * be, make sure to put ours back again.
+ */
+#if defined(BITS_PER_BYTE)
+#if BITS_PER_BYTE != pg_BITS_PER_BYTE
+#error "incompatible byte widths between NSPR and PostgreSQL"
+#endif
+#else
+#define BITS_PER_BYTE pg_BITS_PER_BYTE
+#endif
+#undef pg_BITS_PER_BYTE
+
+static SECStatus pg_load_nss_module(SECMODModule * *module, const char *library, const char *name);
+static SECStatus pg_bad_cert_handler(void *arg, PRFileDesc * fd);
+static char *pg_SSLerrmessage(PRErrorCode errcode);
+static SECStatus pg_client_auth_handler(void *arg, PRFileDesc * socket, CERTDistNames * caNames,
+										CERTCertificate * *pRetCert, SECKEYPrivateKey * *pRetKey);
+static SECStatus pg_cert_auth_handler(void *arg, PRFileDesc * fd, PRBool checksig, PRBool isServer);
+static int	ssl_protocol_version_to_nss(const char *protocol);
+static bool cert_database_has_CA(PGconn *conn);
+
+static char *PQssl_passwd_cb(PK11SlotInfo * slot, PRBool retry, void *arg);
+
+/*
+ * PR_ImportTCPSocket() is a private API, but very widely used, as it's the
+ * only way to make NSS use an already set up POSIX file descriptor rather
+ * than opening one itself. To quote the NSS documentation:
+ *
+ *		"In theory, code that uses PR_ImportTCPSocket may break when NSPR's
+ *		implementation changes. In practice, this is unlikely to happen because
+ *		NSPR's implementation has been stable for years and because of NSPR's
+ *		strong commitment to backward compatibility."
+ *
+ * https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSPR/Reference/PR_ImportTCPSocket
+ *
+ * The function is declared in <private/pprio.h>, but as it is a header marked
+ * private we declare it here rather than including it.
+ */
+NSPR_API(PRFileDesc *) PR_ImportTCPSocket(int);
+
+static SECMODModule * ca_trust = NULL;
+static NSSInitContext * nss_context = NULL;
+
+/*
+ * Track whether the NSS database has a password set or not. There is no API
+ * function for retrieving password status, so we simply flip this to true in
+ * case NSS invoked the password callback - as that will only happen in case
+ * there is a password. The reason for tracking this is that there are calls
+ * which require a password parameter, but doesn't use the callbacks provided,
+ * so we must call the callback on behalf of these.
+ */
+static bool has_password = false;
+
+#if defined(WIN32)
+static const char *ca_trust_name = "nssckbi.dll";
+#elif defined(__darwin__)
+static const char *ca_trust_name = "libnssckbi.dylib";
+#else
+static const char *ca_trust_name = "libnssckbi.so";
+#endif
+
+static PQsslKeyPassHook_nss_type PQsslKeyPassHook = NULL;
+
+/* ------------------------------------------------------------ */
+/*			 Procedures common to all secure sessions			*/
+/* ------------------------------------------------------------ */
+
+void
+pgtls_init_library(bool do_ssl, int do_crypto)
+{
+	/* TODO: implement me .. */
+}
+
+int
+pgtls_init(PGconn *conn)
+{
+	conn->ssl_in_use = false;
+
+	return 0;
+}
+
+void
+pgtls_close(PGconn *conn)
+{
+	if (nss_context)
+	{
+		NSS_ShutdownContext(nss_context);
+		nss_context = NULL;
+	}
+}
+
+PostgresPollingStatusType
+pgtls_open_client(PGconn *conn)
+{
+	SECStatus	status;
+	PRFileDesc *pr_fd;
+	PRFileDesc *model;
+	NSSInitParameters params;
+	SSLVersionRange desired_range;
+
+	/*
+	 * The NSPR documentation states that runtime initialization via PR_Init
+	 * is no longer required, as the first caller into NSPR will perform the
+	 * initialization implicitly. The documentation doesn't however clarify
+	 * from which version this is holds true, so let's perform the potentially
+	 * superfluous initialization anyways to avoid crashing on older versions
+	 * of NSPR, as there is no difference in overhead.  The NSS documentation
+	 * still states that PR_Init must be called in some way (implicitly or
+	 * explicitly).
+	 *
+	 * The below parameters are what the implicit initialization would've done
+	 * for us, and should work even for older versions where it might not be
+	 * done automatically. The last parameter, maxPTDs, is set to various
+	 * values in other codebases, but has been unused since NSPR 2.1 which was
+	 * released sometime in 1998.
+	 */
+	PR_Init(PR_USER_THREAD, PR_PRIORITY_NORMAL, 0);
+
+	/*
+	 * The original design of NSS was for a single application to use a single
+	 * copy of it, initialized with NSS_Initialize() which isn't returning any
+	 * handle with which to refer to NSS. NSS initialization and shutdown are
+	 * global for the application, so a shutdown in another NSS enabled
+	 * library would cause NSS to be stopped for libpq as well.  The fix has
+	 * been to introduce NSS_InitContext which returns a context handle to
+	 * pass to NSS_ShutdownContext.  NSS_InitContext was introduced in NSS
+	 * 3.12, but the use of it is not very well documented.
+	 * https://bugzilla.redhat.com/show_bug.cgi?id=738456
+	 *
+	 * The InitParameters struct passed can be used to override internal
+	 * values in NSS, but the usage is not documented at all. When using
+	 * NSS_Init initializations, the values are instead set via PK11_Configure
+	 * calls so the PK11_Configure documentation can be used to glean some
+	 * details on these.
+	 *
+	 * https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS/PKCS11/Module_Specs
+	 */
+	memset(&params, 0, sizeof(params));
+	params.length = sizeof(params);
+
+	if (conn->cert_database && strlen(conn->cert_database) > 0)
+	{
+		char	   *cert_database_path = psprintf("sql:%s", conn->cert_database);
+
+		nss_context = NSS_InitContext(cert_database_path, "", "", "",
+									  &params,
+									  NSS_INIT_READONLY | NSS_INIT_PK11RELOAD);
+		pfree(cert_database_path);
+	}
+	else
+		nss_context = NSS_InitContext("", "", "", "", &params,
+									  NSS_INIT_READONLY | NSS_INIT_NOCERTDB |
+									  NSS_INIT_NOMODDB | NSS_INIT_FORCEOPEN |
+									  NSS_INIT_NOROOTINIT | NSS_INIT_PK11RELOAD);
+
+	if (!nss_context)
+	{
+		char	   *err = pg_SSLerrmessage(PR_GetError());
+
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to %s certificate database: %s"),
+						  conn->cert_database ? "open" : "create",
+						  err);
+		free(err);
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * Configure cipher policy.
+	 */
+	status = NSS_SetDomesticPolicy();
+	if (status != SECSuccess)
+	{
+		char	   *err = pg_SSLerrmessage(PR_GetError());
+
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to configure cipher policy: %s"),
+						  err);
+		free(err);
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * If we don't have a certificate database, the system trust store is the
+	 * fallback we can use. If we fail to initialize that as well, we can
+	 * still attempt a connection as long as the sslmode isn't verify*.
+	 */
+	if (!conn->cert_database && conn->sslmode[0] == 'v')
+	{
+		status = pg_load_nss_module(&ca_trust, ca_trust_name, "\"Root Certificates\"");
+		/* status = pg_load_nss_module(&ca_trust, ca_trust_name, "trust"); */
+		if (status != SECSuccess)
+		{
+			char	   *err = pg_SSLerrmessage(PR_GetError());
+
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("WARNING: unable to load NSS trust module \"%s\" : %s"), ca_trust_name, err);
+			return PGRES_POLLING_FAILED;
+		}
+	}
+
+
+	PK11_SetPasswordFunc(PQssl_passwd_cb);
+
+	/*
+	 * Import the already opened socket as we don't want to use NSPR functions
+	 * for opening the network socket due to how the PostgreSQL protocol works
+	 * with TLS connections. This function is not part of the NSPR public API,
+	 * see the comment at the top of the file for the rationale of still using
+	 * it.
+	 */
+	pr_fd = PR_ImportTCPSocket(conn->sock);
+	if (!pr_fd)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to attach to socket: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * Most of the documentation available, and implementations of, NSS/NSPR
+	 * use the PR_NewTCPSocket() function here, which has the drawback that it
+	 * can only create IPv4 sockets. Instead use PR_OpenTCPSocket() which
+	 * copes with IPv6 as well.
+	 */
+	model = SSL_ImportFD(NULL, PR_OpenTCPSocket(conn->laddr.addr.ss_family));
+	if (!model)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to enable TLS: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/* Disable old protocol versions (SSLv2 and SSLv3) */
+	SSL_OptionSet(model, SSL_ENABLE_SSL2, PR_FALSE);
+	SSL_OptionSet(model, SSL_V2_COMPATIBLE_HELLO, PR_FALSE);
+	SSL_OptionSet(model, SSL_ENABLE_SSL3, PR_FALSE);
+
+#ifdef SSL_CBC_RANDOM_IV
+
+	/*
+	 * Enable protection against the BEAST attack in case the NSS library has
+	 * support for that. While SSLv3 is disabled, we may still allow TLSv1
+	 * which is affected. The option isn't documented as an SSL option, but as
+	 * an NSS environment variable.
+	 */
+	SSL_OptionSet(model, SSL_CBC_RANDOM_IV, PR_TRUE);
+#endif
+
+	/* Set us up as a TLS client for the handshake */
+	SSL_OptionSet(model, SSL_HANDSHAKE_AS_CLIENT, PR_TRUE);
+
+	/*
+	 * When setting the available protocols, we either use the user defined
+	 * configuration values, and if missing we accept whatever is the highest
+	 * version supported by the library as the max and only limit the range in
+	 * the other end at TLSv1.0. ssl_variant_stream is a ProtocolVariant enum
+	 * for Stream protocols, rather than datagram.
+	 */
+	SSL_VersionRangeGetSupported(ssl_variant_stream, &desired_range);
+	desired_range.min = SSL_LIBRARY_VERSION_TLS_1_0;
+
+	if (conn->ssl_min_protocol_version && strlen(conn->ssl_min_protocol_version) > 0)
+	{
+		int			ssl_min_ver = ssl_protocol_version_to_nss(conn->ssl_min_protocol_version);
+
+		if (ssl_min_ver == -1)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("invalid value \"%s\" for minimum version of SSL protocol\n"),
+							  conn->ssl_min_protocol_version);
+			return -1;
+		}
+
+		desired_range.min = ssl_min_ver;
+	}
+
+	if (conn->ssl_max_protocol_version && strlen(conn->ssl_max_protocol_version) > 0)
+	{
+		int			ssl_max_ver = ssl_protocol_version_to_nss(conn->ssl_max_protocol_version);
+
+		if (ssl_max_ver == -1)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("invalid value \"%s\" for maximum version of SSL protocol\n"),
+							  conn->ssl_max_protocol_version);
+			return -1;
+		}
+
+		desired_range.max = ssl_max_ver;
+	}
+
+	if (SSL_VersionRangeSet(model, &desired_range) != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to set allowed SSL protocol version range: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * Set up callback for verifying server certificates, as well as for how
+	 * to handle failed verifications.
+	 */
+	SSL_AuthCertificateHook(model, pg_cert_auth_handler, (void *) conn);
+	SSL_BadCertHook(model, pg_bad_cert_handler, (void *) conn);
+
+	/*
+	 * Convert the NSPR socket to an SSL socket. Ensuring the success of this
+	 * operation is critical as NSS SSL_* functions may return SECSuccess on
+	 * the socket even though SSL hasn't been enabled, which introduce a risk
+	 * of silent downgrades.
+	 */
+	conn->pr_fd = SSL_ImportFD(model, pr_fd);
+	if (!conn->pr_fd)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to configure client for TLS: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * The model can now we closed as we've applied the settings of the model
+	 * onto the real socket. From hereon we should only use conn->pr_fd.
+	 */
+	PR_Close(model);
+
+	/* Set the private data to be passed to the password callback */
+	SSL_SetPKCS11PinArg(conn->pr_fd, (void *) conn);
+
+	/*
+	 * If a CRL file has been specified, verify if it exists in the database
+	 * but don't fail in case it doesn't.
+	 */
+	if (conn->sslcrl && strlen(conn->sslcrl) > 0)
+	{
+		/* XXX: Implement me.. */
+	}
+
+	status = SSL_ResetHandshake(conn->pr_fd, PR_FALSE);
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to initiate handshake: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * Set callback for client authentication when requested by the server.
+	 */
+	SSL_GetClientAuthDataHook(conn->pr_fd, pg_client_auth_handler, (void *) conn);
+
+	/*
+	 * Specify which hostname we are expecting to talk to. This is required,
+	 * albeit mostly applies to when opening a connection to a traditional
+	 * http server it seems.
+	 */
+	SSL_SetURL(conn->pr_fd, (conn->connhost[conn->whichhost]).host);
+
+	do
+	{
+		status = SSL_ForceHandshake(conn->pr_fd);
+	}
+	while (status != SECSuccess && PR_GetError() == PR_WOULD_BLOCK_ERROR);
+
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("SSL error: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	conn->ssl_in_use = true;
+	return PGRES_POLLING_OK;
+}
+
+ssize_t
+pgtls_read(PGconn *conn, void *ptr, size_t len)
+{
+	PRInt32		nread;
+	PRErrorCode status;
+	int			read_errno = 0;
+
+	nread = PR_Recv(conn->pr_fd, ptr, len, 0, PR_INTERVAL_NO_WAIT);
+
+	/*
+	 * PR_Recv blocks until there is data to read or the timeout expires. Zero
+	 * is returned for closed connections, while -1 indicates an error within
+	 * the ongoing connection.
+	 */
+	if (nread == 0)
+	{
+		read_errno = ECONNRESET;
+		return -1;
+	}
+
+	if (nread == -1)
+	{
+		status = PR_GetError();
+
+		switch (status)
+		{
+			case PR_WOULD_BLOCK_ERROR:
+				read_errno = EINTR;
+				break;
+
+			case PR_IO_TIMEOUT_ERROR:
+				break;
+
+				/*
+				 * The error cases for PR_Recv are not documented, but can be
+				 * reverse engineered from _MD_unix_map_default_error() in the
+				 * NSPR code, defined in pr/src/md/unix/unix_errors.c.
+				 */
+			default:
+				printfPQExpBuffer(&conn->errorMessage,
+								  libpq_gettext("TLS read error: %s"),
+								  pg_SSLerrmessage(status));
+				break;
+		}
+	}
+
+	SOCK_ERRNO_SET(read_errno);
+	return (ssize_t) nread;
+}
+
+/*
+ * pgtls_read_pending
+ *		Check for the existence of data to be read.
+ *
+ * This is part of the PostgreSQL TLS backend API.
+ */
+bool
+pgtls_read_pending(PGconn *conn)
+{
+	unsigned char c;
+	int			n;
+
+	/*
+	 * PR_Recv peeks into the stream with the timeount turned off, to see if
+	 * there is another byte to read off the wire. There is an NSS function
+	 * SSL_DataPending() which might seem like a better fit, but it will only
+	 * check already encrypted data in the SSL buffer, not still unencrypted
+	 * data, thus it doesn't guarantee that a subsequent call to
+	 * PR_Read/PR_Recv wont block.
+	 */
+	n = PR_Recv(conn->pr_fd, &c, 1, PR_MSG_PEEK, PR_INTERVAL_NO_WAIT);
+	return (n > 0);
+}
+
+ssize_t
+pgtls_write(PGconn *conn, const void *ptr, size_t len)
+{
+	PRInt32		n;
+	PRErrorCode status;
+	int			write_errno = 0;
+
+	n = PR_Write(conn->pr_fd, ptr, len);
+
+	if (n < 0)
+	{
+		status = PR_GetError();
+
+		switch (status)
+		{
+			case PR_WOULD_BLOCK_ERROR:
+#ifdef EAGAIN
+				write_errno = EAGAIN;
+#else
+				write_errno = EINTR;
+#endif
+				break;
+
+			default:
+				printfPQExpBuffer(&conn->errorMessage,
+								  libpq_gettext("TLS write error: %s"),
+								  pg_SSLerrmessage(status));
+				write_errno = ECONNRESET;
+				break;
+		}
+	}
+
+	SOCK_ERRNO_SET(write_errno);
+	return (ssize_t) n;
+}
+
+/*
+ *	Verify that the server certificate matches the hostname we connected to.
+ *
+ * The certificate's Common Name and Subject Alternative Names are considered.
+ */
+int
+pgtls_verify_peer_name_matches_certificate_guts(PGconn *conn,
+												int *names_examined,
+												char **first_name)
+{
+	return 1;
+}
+
+/* ------------------------------------------------------------ */
+/*			PostgreSQL specific TLS support functions			*/
+/* ------------------------------------------------------------ */
+
+/*
+ * TODO: this a 99% copy of the same function in the backend, make these share
+ * a single implementation instead.
+ */
+static char *
+pg_SSLerrmessage(PRErrorCode errcode)
+{
+	const char *error;
+
+	error = PR_ErrorToName(errcode);
+	if (error)
+		return strdup(error);
+
+	return strdup("unknown TLS error");
+}
+
+static SECStatus
+pg_load_nss_module(SECMODModule * *module, const char *library, const char *name)
+{
+	SECMODModule *mod;
+	char	   *modulespec;
+
+	modulespec = psprintf("library=\"%s\", name=\"%s\"", library, name);
+
+	/*
+	 * Attempt to load the specified module. The second parameter is "parent"
+	 * which should always be NULL for application code. The third parameter
+	 * defines if loading should recurse which is only applicable when loading
+	 * a module from within another module. This hierarchy would have to be
+	 * defined in the modulespec, and since we don't support anything but
+	 * directly addressed modules we should pass PR_FALSE.
+	 */
+	mod = SECMOD_LoadUserModule(modulespec, NULL, PR_FALSE);
+	pfree(modulespec);
+
+	if (mod && mod->loaded)
+	{
+		*module = mod;
+		return SECSuccess;
+	}
+
+	SECMOD_DestroyModule(mod);
+	return SECFailure;
+}
+
+/* ------------------------------------------------------------ */
+/*						NSS Callbacks							*/
+/* ------------------------------------------------------------ */
+
+/*
+ * pg_cert_auth_handler
+ *			Callback for authenticating server certificate
+ *
+ * This is pretty much the same procedure as the SSL_AuthCertificate function
+ * provided by NSS, with the difference being server hostname validation. With
+ * SSL_AuthCertificate there is no way to do verify-ca, it only does the -full
+ * flavor of our sslmodes, so we need our own implementation.
+ */
+static SECStatus
+pg_cert_auth_handler(void *arg, PRFileDesc * fd, PRBool checksig, PRBool isServer)
+{
+	SECStatus	status;
+	PGconn	   *conn = (PGconn *) arg;
+	char	   *server_hostname = NULL;
+	CERTCertificate *server_cert;
+	void	   *pin;
+
+	Assert(!isServer);
+
+	pin = SSL_RevealPinArg(conn->pr_fd);
+	server_cert = SSL_PeerCertificate(conn->pr_fd);
+
+	status = CERT_VerifyCertificateNow((CERTCertDBHandle *) CERT_GetDefaultCertDB(), server_cert,
+									   checksig, certificateUsageSSLServer,
+									   pin, NULL);
+
+	/*
+	 * If we've already failed validation then there is no point in also
+	 * performing the hostname check for verify-full.
+	 */
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to verify certificate: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		goto done;
+	}
+
+	if (strcmp(conn->sslmode, "verify-full") == 0)
+	{
+		server_hostname = SSL_RevealURL(conn->pr_fd);
+		if (!server_hostname || server_hostname[0] == '\0')
+			goto done;
+
+		/*
+		 * CERT_VerifyCertName will internally perform RFC 2818 SubjectAltName
+		 * verification.
+		 */
+		status = CERT_VerifyCertName(server_cert, server_hostname);
+		if (status != SECSuccess)
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("unable to verify server hostname: %s"),
+							  pg_SSLerrmessage(PR_GetError()));
+
+	}
+
+done:
+	if (server_hostname)
+		PR_Free(server_hostname);
+
+	CERT_DestroyCertificate(server_cert);
+	return status;
+}
+
+/*
+ * pg_client_auth_handler
+ *		Callback for client certificate validation
+ *
+ * The client auth callback is not on by default in NSS, so we need to invoke
+ * it ourselves to ensure we can do cert authentication. A TODO is to support
+ * running without a specified sslcert parameter. By retrieving all the certs
+ * via nickname from the cert database and see if we find one which apply with
+ * NSS_CmpCertChainWCANames() and PK11_FindKeyByAnyCert() we could support
+ * just running with a ssl database specified.
+ *
+ * For now, we use the default client certificate validation which requires a
+ * defined nickname to identify the cert in the database.
+ */
+static SECStatus
+pg_client_auth_handler(void *arg, PRFileDesc * socket, CERTDistNames * caNames,
+					   CERTCertificate * *pRetCert, SECKEYPrivateKey * *pRetKey)
+{
+	PGconn	   *conn = (PGconn *) arg;
+
+	return NSS_GetClientAuthData(conn->sslcert, socket, caNames, pRetCert, pRetKey);
+}
+
+/*
+ * pg_bad_cert_handler
+ *		Callback for failed certificate validation
+ *
+ * The TLS handshake will call this function iff the server certificate failed
+ * validation. Depending on the sslmode, we allow the connection anyways.
+ */
+static SECStatus
+pg_bad_cert_handler(void *arg, PRFileDesc * fd)
+{
+	PGconn	   *conn = (PGconn *) arg;
+	PRErrorCode err;
+
+	/*
+	 * This really shouldn't happen, as we've the the PGconn object as our
+	 * callback data, and at the callsite we know it will be populated. That
+	 * being said, the NSS code itself performs this check even when it should
+	 * not be required so let's use the same belts with our suspenders.
+	 */
+	if (!arg)
+		return SECFailure;
+
+	/*
+	 * For sslmodes other than verify-full and verify-ca we don't perform peer
+	 * validation, so return immediately.  sslmode require with a database
+	 * specified which contains a CA certificate will work like verify-ca to
+	 * be compatible with the OpenSSL implementation.
+	 */
+	if (strcmp(conn->sslmode, "require") == 0)
+	{
+		if (conn->cert_database && strlen(conn->cert_database) > 0 && cert_database_has_CA(conn))
+			return SECFailure;
+	}
+	if (conn->sslmode[0] == 'v')
+		return SECFailure;
+
+	err = PORT_GetError();
+
+	/*
+	 * TODO: these are relevant error codes that can occur in certificate
+	 * validation, figure out which we dont want for require/prefer etc.
+	 */
+	switch (err)
+	{
+		case SEC_ERROR_INVALID_AVA:
+		case SEC_ERROR_INVALID_TIME:
+		case SEC_ERROR_BAD_SIGNATURE:
+		case SEC_ERROR_EXPIRED_CERTIFICATE:
+		case SEC_ERROR_UNKNOWN_ISSUER:
+		case SEC_ERROR_UNTRUSTED_ISSUER:
+		case SEC_ERROR_UNTRUSTED_CERT:
+		case SEC_ERROR_CERT_VALID:
+		case SEC_ERROR_EXPIRED_ISSUER_CERTIFICATE:
+		case SEC_ERROR_CRL_EXPIRED:
+		case SEC_ERROR_CRL_BAD_SIGNATURE:
+		case SEC_ERROR_EXTENSION_VALUE_INVALID:
+		case SEC_ERROR_CA_CERT_INVALID:
+		case SEC_ERROR_CERT_USAGES_INVALID:
+		case SEC_ERROR_UNKNOWN_CRITICAL_EXTENSION:
+			return SECSuccess;
+			break;
+		default:
+			return SECFailure;
+			break;
+	}
+
+	/* Unreachable */
+	return SECSuccess;
+}
+
+/* ------------------------------------------------------------ */
+/*					SSL information functions					*/
+/* ------------------------------------------------------------ */
+
+void *
+PQgetssl(PGconn *conn)
+{
+	/*
+	 * Always return NULL as this is legacy and defined to be equal to
+	 * PQsslStruct(conn, "OpenSSL"); This should ideally trigger a logged
+	 * warning somewhere as it's nonsensical to run in a non-OpenSSL build,
+	 * but the color of said bikeshed hasn't yet been determined.
+	 */
+	return NULL;
+}
+
+void *
+PQsslStruct(PGconn *conn, const char *struct_name)
+{
+	if (!conn)
+		return NULL;
+
+	/*
+	 * Return the underlying PRFileDesc which can be used to access
+	 * information on the connection details. There is no SSL context per se.
+	 */
+	if (strcmp(struct_name, "NSS") == 0)
+		return conn->pr_fd;
+	return NULL;
+}
+
+const char *const *
+PQsslAttributeNames(PGconn *conn)
+{
+	static const char *const result[] = {
+		"library",
+		"cipher",
+		"protocol",
+		"key_bits",
+		"compression",
+		NULL
+	};
+
+	return result;
+}
+
+const char *
+PQsslAttribute(PGconn *conn, const char *attribute_name)
+{
+	SECStatus	status;
+	SSLChannelInfo channel;
+	SSLCipherSuiteInfo suite;
+
+	if (!conn || !conn->pr_fd)
+		return NULL;
+
+	if (strcmp(attribute_name, "library") == 0)
+		return "NSS";
+
+	status = SSL_GetChannelInfo(conn->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+		return NULL;
+
+	status = SSL_GetCipherSuiteInfo(channel.cipherSuite, &suite, sizeof(suite));
+	if (status != SECSuccess)
+		return NULL;
+
+	if (strcmp(attribute_name, "cipher") == 0)
+		return suite.cipherSuiteName;
+
+	if (strcmp(attribute_name, "key_bits") == 0)
+	{
+		static char key_bits_str[8];
+
+		snprintf(key_bits_str, sizeof(key_bits_str), "%i", suite.effectiveKeyBits);
+		return key_bits_str;
+	}
+
+	if (strcmp(attribute_name, "protocol") == 0)
+	{
+		switch (channel.protocolVersion)
+		{
+#ifdef SSL_LIBRARY_VERSION_TLS_1_3
+			case SSL_LIBRARY_VERSION_TLS_1_3:
+				return "TLSv1.3";
+#endif
+#ifdef SSL_LIBRARY_VERSION_TLS_1_2
+			case SSL_LIBRARY_VERSION_TLS_1_2:
+				return "TLSv1.2";
+#endif
+#ifdef SSL_LIBRARY_VERSION_TLS_1_1
+			case SSL_LIBRARY_VERSION_TLS_1_1:
+				return "TLSv1.1";
+#endif
+			case SSL_LIBRARY_VERSION_TLS_1_0:
+				return "TLSv1.0";
+			default:
+				return "unknown";
+		}
+	}
+
+	/*
+	 * NSS disabled support for compression in version 3.33, and it was only
+	 * available for SSLv3 at that point anyways, so we can safely return off
+	 * here without checking.
+	 */
+	if (strcmp(attribute_name, "compression") == 0)
+		return "off";
+
+	return NULL;
+}
+
+static int
+ssl_protocol_version_to_nss(const char *protocol)
+{
+	if (pg_strcasecmp("TLSv1", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_0;
+
+#ifdef SSL_LIBRARY_VERSION_TLS_1_1
+	if (pg_strcasecmp("TLSv1.1", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_1;
+#endif
+
+#ifdef SSL_LIBRARY_VERSION_TLS_1_2
+	if (pg_strcasecmp("TLSv1.2", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_2;
+#endif
+
+#ifdef SSL_LIBRARY_VERSION_TLS_1_3
+	if (pg_strcasecmp("TLSv1.3", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_3;
+#endif
+
+	return -1;
+}
+
+static bool
+cert_database_has_CA(PGconn *conn)
+{
+	CERTCertList *certificates;
+	bool		hasCA;
+
+	/*
+	 * If the certificate database has a password we must provide it, since
+	 * this API doesn't invoke the standard password callback.
+	 */
+	if (has_password)
+		certificates = PK11_ListCerts(PK11CertListCA, PQssl_passwd_cb(NULL, PR_FALSE, (void *) conn));
+	else
+		certificates = PK11_ListCerts(PK11CertListCA, NULL);
+	hasCA = !CERT_LIST_EMPTY(certificates);
+	CERT_DestroyCertList(certificates);
+
+	return hasCA;
+}
+
+PQsslKeyPassHook_nss_type
+PQgetSSLKeyPassHook_nss(void)
+{
+	return PQsslKeyPassHook;
+}
+
+void
+PQsetSSLKeyPassHook_nss(PQsslKeyPassHook_nss_type hook)
+{
+	PQsslKeyPassHook = hook;
+}
+
+/*
+ * Supply a password to decrypt a client certificate.
+ *
+ * This must match NSS type PK11PasswordFunc.
+ */
+static char *
+PQssl_passwd_cb(PK11SlotInfo * slot, PRBool retry, void *arg)
+{
+	has_password = true;
+
+	if (PQsslKeyPassHook)
+		return PQsslKeyPassHook(slot, (PRBool) retry, arg);
+	else
+		return PQdefaultSSLKeyPassHook_nss(slot, retry, arg);
+}
+
+/*
+ * The default password handler callback.
+ */
+char *
+PQdefaultSSLKeyPassHook_nss(PK11SlotInfo * slot, PRBool retry, void *arg)
+{
+	PGconn	   *conn = (PGconn *) arg;
+
+	/*
+	 * If the password didn't work the first time there is no point in
+	 * retrying as it hasn't changed.
+	 */
+	if (retry != PR_TRUE && conn->sslpassword && strlen(conn->sslpassword) > 0)
+		return PORT_Strdup(conn->sslpassword);
+
+	return NULL;
+}
diff --git a/src/interfaces/libpq/fe-secure.c b/src/interfaces/libpq/fe-secure.c
index 3311fd7a5b..b6c92ece11 100644
--- a/src/interfaces/libpq/fe-secure.c
+++ b/src/interfaces/libpq/fe-secure.c
@@ -430,6 +430,9 @@ PQsslAttributeNames(PGconn *conn)
 
 	return result;
 }
+#endif /* USE_SSL */
+
+#ifndef USE_OPENSSL
 
 PQsslKeyPassHook_OpenSSL_type
 PQgetSSLKeyPassHook_OpenSSL(void)
@@ -448,7 +451,7 @@ PQdefaultSSLKeyPassHook_OpenSSL(char *buf, int size, PGconn *conn)
 {
 	return 0;
 }
-#endif							/* USE_SSL */
+#endif							/* USE_OPENSSL */
 
 /* Dummy version of GSSAPI information functions, when built without GSS support */
 #ifndef ENABLE_GSS
diff --git a/src/interfaces/libpq/libpq-fe.h b/src/interfaces/libpq/libpq-fe.h
index 3b6a9fbce3..27c16e187f 100644
--- a/src/interfaces/libpq/libpq-fe.h
+++ b/src/interfaces/libpq/libpq-fe.h
@@ -625,6 +625,17 @@ extern PQsslKeyPassHook_OpenSSL_type PQgetSSLKeyPassHook_OpenSSL(void);
 extern void PQsetSSLKeyPassHook_OpenSSL(PQsslKeyPassHook_OpenSSL_type hook);
 extern int	PQdefaultSSLKeyPassHook_OpenSSL(char *buf, int size, PGconn *conn);
 
+/* == in fe-secure-nss.c === */
+typedef struct PK11SlotInfoStr PK11SlotInfo;
+typedef int PRIntn;
+typedef PRIntn PRBool;
+
+/* Support for overriding sslpassword handling with a callback. */
+typedef char *(*PQsslKeyPassHook_nss_type) (PK11SlotInfo * slot, PRBool retry, void *arg);
+extern PQsslKeyPassHook_nss_type PQgetSSLKeyPassHook_nss(void);
+extern void PQsetSSLKeyPassHook_nss(PQsslKeyPassHook_nss_type hook);
+extern char *PQdefaultSSLKeyPassHook_nss(PK11SlotInfo * slot, PRBool retry, void *arg);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/src/interfaces/libpq/libpq-int.h b/src/interfaces/libpq/libpq-int.h
index 1de91ae295..12717ca720 100644
--- a/src/interfaces/libpq/libpq-int.h
+++ b/src/interfaces/libpq/libpq-int.h
@@ -362,6 +362,7 @@ struct pg_conn
 	char	   *sslpassword;	/* client key file password */
 	char	   *sslrootcert;	/* root certificate filename */
 	char	   *sslcrl;			/* certificate revocation list filename */
+	char	   *cert_database;
 	char	   *requirepeer;	/* required peer credentials for local sockets */
 	char	   *gssencmode;		/* GSS mode (require,prefer,disable) */
 	char	   *krbsrvname;		/* Kerberos service name */
@@ -485,6 +486,10 @@ struct pg_conn
 								 * OpenSSL version changes */
 #endif
 #endif							/* USE_OPENSSL */
+
+#ifdef USE_NSS
+	void	   *pr_fd;
+#endif							/* USE_NSS */
 #endif							/* USE_SSL */
 
 #ifdef ENABLE_GSS
diff --git a/src/test/Makefile b/src/test/Makefile
index efb206aa75..d18f5a083b 100644
--- a/src/test/Makefile
+++ b/src/test/Makefile
@@ -27,7 +27,7 @@ ifneq (,$(filter ldap,$(PG_TEST_EXTRA)))
 SUBDIRS += ldap
 endif
 endif
-ifeq ($(with_openssl),yes)
+ifeq ($(with_ssl),yes)
 ifneq (,$(filter ssl,$(PG_TEST_EXTRA)))
 SUBDIRS += ssl
 endif
diff --git a/src/test/ssl/Makefile b/src/test/ssl/Makefile
index 777ee39413..fe265e2dbd 100644
--- a/src/test/ssl/Makefile
+++ b/src/test/ssl/Makefile
@@ -14,6 +14,7 @@ top_builddir = ../../..
 include $(top_builddir)/src/Makefile.global
 
 export with_openssl
+export with_nss
 
 CERTIFICATES := server_ca server-cn-and-alt-names \
 	server-cn-only server-single-alt-name server-multiple-alt-names \
@@ -30,6 +31,32 @@ SSLFILES := $(CERTIFICATES:%=ssl/%.key) $(CERTIFICATES:%=ssl/%.crt) \
 	ssl/client+client_ca.crt ssl/client-der.key \
 	ssl/client-encrypted-pem.key ssl/client-encrypted-der.key
 
+# Even though we in practice could get away with far fewer NSS databases, they
+# are generated to mimick the setup for the OpenSSL tests in order to ensure
+# we isolate the same behavior between the backends. The database name should
+# contain the files included for easier test suite code reading.
+NSSFILES := ssl/nss/client_ca.crt.db \
+	ssl/nss/server_ca.crt.db \
+	ssl/nss/root+server_ca.crt.db \
+	ssl/nss/root+client_ca.crt.db \
+	ssl/nss/client.crt__client.key.db \
+	ssl/nss/client-revoked.crt__client-revoked.key.db \
+	ssl/nss/server-cn-only.crt__server-password.key.db \
+	ssl/nss/server-cn-only.crt__server-cn-only.key.db \
+	ssl/nss/root.crl \
+	ssl/nss/server.crl \
+	ssl/nss/client.crl \
+	ssl/nss/server-multiple-alt-names.crt__server-multiple-alt-names.key.db \
+	ssl/nss/server-single-alt-name.crt__server-single-alt-name.key.db \
+	ssl/nss/server-cn-and-alt-names.crt__server-cn-and-alt-names.key.db \
+	ssl/nss/server-no-names.crt__server-no-names.key.db \
+	ssl/nss/server-revoked.crt__server-revoked.key.db \
+	ssl/nss/root+client.crl \
+	ssl/nss/client+client_ca.crt__client.key.db \
+	ssl/nss/client.crt__client-encrypted-pem.key.db \
+	ssl/nss/root+server_ca.crt__server.crl.db \
+	ssl/nss/root+server_ca.crt__root+server.crl.db
+
 # This target re-generates all the key and certificate files. Usually we just
 # use the ones that are committed to the tree without rebuilding them.
 #
@@ -37,6 +64,10 @@ SSLFILES := $(CERTIFICATES:%=ssl/%.key) $(CERTIFICATES:%=ssl/%.crt) \
 #
 sslfiles: $(SSLFILES)
 
+# Generate NSS certificate databases corresponding to the OpenSSL certificates.
+# This target will fail unless preceded by nssfiles-clean.
+nssfiles: $(NSSFILES)
+
 # OpenSSL requires a directory to put all generated certificates in. We don't
 # use this for anything, but we need a location.
 ssl/new_certs_dir:
@@ -64,6 +95,24 @@ ssl/%_ca.crt: ssl/%_ca.key %_ca.config ssl/root_ca.crt ssl/new_certs_dir
 	rm ssl/temp_ca.crt ssl/temp_ca_signed.crt
 	echo "01" > ssl/$*_ca.srl
 
+ssl/nss/%_ca.crt.db: ssl/%_ca.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n $*_ca.crt -i ssl/$*_ca.crt -t "CT,C,C"
+
+ssl/nss/root+server_ca.crt__server.crl.db: ssl/root+server_ca.crt ssl/nss/server.crl
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	crlutil -I -i ssl/nss/server.crl -d $@ -B
+
+ssl/nss/root+server_ca.crt__root+server.crl.db: ssl/root+server_ca.crt ssl/nss/root.crl ssl/nss/server.crl
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	crlutil -I -i ssl/nss/root.crl -d $@ -B
+	crlutil -I -i ssl/nss/server.crl -d $@ -B
+
 # Server certificates, signed by server CA:
 ssl/server-%.crt: ssl/server-%.key ssl/server_ca.crt server-%.config
 	openssl req -new -key ssl/server-$*.key -out ssl/server-$*.csr -config server-$*.config
@@ -77,6 +126,74 @@ ssl/server-ss.crt: ssl/server-cn-only.key ssl/server-cn-only.crt server-cn-only.
 	openssl x509 -req -days 10000 -in ssl/server-ss.csr -signkey ssl/server-cn-only.key -out ssl/server-ss.crt  -extensions v3_req -extfile server-cn-only.config
 	rm ssl/server-ss.csr
 
+ssl/nss/server-cn-only.crt__server-password.key.db: ssl/server-cn-only.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-cn-only.crt -i ssl/server-cn-only.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-password.pfx -inkey ssl/server-password.key -in ssl/server-cn-only.crt -certfile ssl/server_ca.crt -passin 'pass:secret1' -passout pass:
+	pk12util -i ssl/nss/server-password.pfx -d $@ -W ''
+
+ssl/nss/server-cn-only.crt__server-cn-only.key.db: ssl/server-cn-only.crt ssl/server-cn-only.key
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-cn-only.crt -i ssl/server-cn-only.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-cn-only.pfx -inkey ssl/server-cn-only.key -in ssl/server-cn-only.crt -certfile ssl/server_ca.crt -passout pass:
+	pk12util -i ssl/nss/server-cn-only.pfx -d $@ -W ''
+
+ssl/nss/server-multiple-alt-names.crt__server-multiple-alt-names.key.db: ssl/server-multiple-alt-names.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-multiple-alt-names.crt -i ssl/server-multiple-alt-names.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-multiple-alt-names.pfx -inkey ssl/server-multiple-alt-names.key -in ssl/server-multiple-alt-names.crt -certfile ssl/server-multiple-alt-names.crt -passout pass:
+	pk12util -i ssl/nss/server-multiple-alt-names.pfx -d $@ -W ''
+
+ssl/nss/server-single-alt-name.crt__server-single-alt-name.key.db: ssl/server-single-alt-name.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-single-alt-name.crt -i ssl/server-single-alt-name.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-single-alt-name.pfx -inkey ssl/server-single-alt-name.key -in ssl/server-single-alt-name.crt -certfile ssl/server-single-alt-name.crt -passout pass:
+	pk12util -i ssl/nss/server-single-alt-name.pfx -d $@ -W ''
+
+ssl/nss/server-cn-and-alt-names.crt__server-cn-and-alt-names.key.db: ssl/server-cn-and-alt-names.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-cn-and-alt-names.crt -i ssl/server-cn-and-alt-names.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-cn-and-alt-names.pfx -inkey ssl/server-cn-and-alt-names.key -in ssl/server-cn-and-alt-names.crt -certfile ssl/server-cn-and-alt-names.crt -passout pass:
+	pk12util -i ssl/nss/server-cn-and-alt-names.pfx -d $@ -W ''
+
+ssl/nss/server-no-names.crt__server-no-names.key.db: ssl/server-no-names.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-no-names.crt -i ssl/server-no-names.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-no-names.pfx -inkey ssl/server-no-names.key -in ssl/server-no-names.crt -certfile ssl/server-no-names.crt -passout pass:
+	pk12util -i ssl/nss/server-no-names.pfx -d $@ -W ''
+
+ssl/nss/server-revoked.crt__server-revoked.key.db: ssl/server-revoked.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-revoked.crt -i ssl/server-revoked.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-revoked.pfx -inkey ssl/server-revoked.key -in ssl/server-revoked.crt -certfile ssl/server-revoked.crt -passout pass:
+	pk12util -i ssl/nss/server-revoked.pfx -d $@ -W ''
+
 # Password-protected version of server-cn-only.key
 ssl/server-password.key: ssl/server-cn-only.key
 	openssl rsa -aes256 -in $< -out $@ -passout 'pass:secret1'
@@ -88,6 +205,27 @@ ssl/client.crt: ssl/client.key ssl/client_ca.crt
 	openssl x509 -in ssl/temp.crt -out ssl/client.crt # to keep just the PEM cert
 	rm ssl/client.csr ssl/temp.crt
 
+# Client certificate, signed by client CA
+ssl/nss/client.crt__client.key.db: ssl/client.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/client.crt -i ssl/client.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root+client_ca.crt -i ssl/root+client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client.pfx -inkey ssl/client.key -in ssl/client.crt -certfile ssl/client_ca.crt -passout pass:
+	pk12util -i ssl/nss/client.pfx -d $@ -W ''
+
+# Client certificate with encrypted key, signed by client CA
+ssl/nss/client.crt__client-encrypted-pem.key.db: ssl/client.crt
+	$(MKDIR_P) $@
+	echo 'dUmmyP^#+' > $@.pass
+	certutil -d "sql:$@" -N -f $@.pass
+	certutil -d "sql:$@" -A -f $@.pass -n ssl/client.crt -i ssl/client.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -f $@.pass -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -f $@.pass -n root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client-encrypted-pem.pfx -inkey ssl/client-encrypted-pem.key -in ssl/client.crt -certfile ssl/client_ca.crt -passin pass:'dUmmyP^#+' -passout pass:'dUmmyP^#+'
+	pk12util -i ssl/nss/client-encrypted-pem.pfx -d $@ -W 'dUmmyP^#+' -k $@.pass
+
 # Another client certificate, signed by the client CA. This one is revoked.
 ssl/client-revoked.crt: ssl/client-revoked.key ssl/client_ca.crt client.config
 	openssl req -new -key ssl/client-revoked.key -out ssl/client-revoked.csr -config client.config
@@ -95,6 +233,14 @@ ssl/client-revoked.crt: ssl/client-revoked.key ssl/client_ca.crt client.config
 	openssl x509 -in ssl/temp.crt -out ssl/client-revoked.crt # to keep just the PEM cert
 	rm ssl/client-revoked.csr ssl/temp.crt
 
+ssl/nss/client-revoked.crt__client-revoked.key.db: ssl/client-revoked.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/client-revoked.crt -i ssl/client-revoked.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client-revoked.pfx -inkey ssl/client-revoked.key -in ssl/client-revoked.crt -certfile ssl/client_ca.crt -passout pass:
+	pk12util -i ssl/nss/client-revoked.pfx -d $@ -W ''
+
 # Convert the key to DER, to test our behaviour there too
 ssl/client-der.key: ssl/client.key
 	openssl rsa -in ssl/client.key -outform DER -out ssl/client-der.key
@@ -127,19 +273,40 @@ ssl/root+client_ca.crt: ssl/root_ca.crt ssl/client_ca.crt
 ssl/client+client_ca.crt: ssl/client.crt ssl/client_ca.crt
 	cat $^ > $@
 
+# Client certificate, signed by client CA
+ssl/nss/client+client_ca.crt__client.key.db: ssl/client+client_ca.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/client+client_ca.crt -i ssl/client+client_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n ssl/root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client.pfx -inkey ssl/client.key -in ssl/client.crt -certfile ssl/client_ca.crt -passout pass:
+	pk12util -i ssl/nss/client.pfx -d $@ -W ''
+
 #### CRLs
 
 ssl/client.crl: ssl/client-revoked.crt
 	openssl ca -config cas.config -name client_ca -revoke ssl/client-revoked.crt
 	openssl ca -config cas.config -name client_ca -gencrl -out ssl/client.crl
 
+ssl/nss/client.crl: ssl/client.crl
+	openssl crl -in $^ -outform der -out $@
+
 ssl/server.crl: ssl/server-revoked.crt
 	openssl ca -config cas.config -name server_ca -revoke ssl/server-revoked.crt
 	openssl ca -config cas.config -name server_ca -gencrl -out ssl/server.crl
 
+ssl/nss/server.crl: ssl/server.crl
+	openssl crl -in $^ -outform der -out $@
+
 ssl/root.crl: ssl/root_ca.crt
 	openssl ca -config cas.config -name root_ca -gencrl -out ssl/root.crl
 
+ssl/nss/root.crl: ssl/root.crl
+	openssl crl -in $^ -outform der -out $@
+
+ssl/nss/root+client.crl: ssl/root+client.crl
+	openssl crl -in $^ -outform der -out $@
+
 # If a CRL is used, OpenSSL requires a CRL file for *all* the CAs in the
 # chain, even if some of them are empty.
 ssl/root+server.crl: ssl/root.crl ssl/server.crl
@@ -151,9 +318,14 @@ ssl/root+client.crl: ssl/root.crl ssl/client.crl
 sslfiles-clean:
 	rm -f $(SSLFILES) ssl/client_ca.srl ssl/server_ca.srl ssl/client_ca-certindex* ssl/server_ca-certindex* ssl/root_ca-certindex* ssl/root_ca.srl ssl/temp_ca.crt ssl/temp_ca_signed.crt
 
+.PHONY: nssfiles-clean
+nssfiles-clean:
+	rm -rf ssl/nss
+
 clean distclean maintainer-clean:
 	rm -rf tmp_check
 	rm -rf ssl/*.old ssl/new_certs_dir ssl/client*_tmp.key
+	rm -rf ssl/nss
 
 # Doesn't depend on $(SSLFILES) because we don't rebuild them by default
 check:
diff --git a/src/test/ssl/ssl/nss/client+client_ca.crt__client.key.db/cert9.db b/src/test/ssl/ssl/nss/client+client_ca.crt__client.key.db/cert9.db
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diff --git a/src/test/ssl/ssl/nss/client+client_ca.crt__client.key.db/key4.db b/src/test/ssl/ssl/nss/client+client_ca.crt__client.key.db/key4.db
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diff --git a/src/test/ssl/ssl/nss/client+client_ca.crt__client.key.db/pkcs11.txt b/src/test/ssl/ssl/nss/client+client_ca.crt__client.key.db/pkcs11.txt
new file mode 100644
index 0000000000..dfffe92b90
--- /dev/null
+++ b/src/test/ssl/ssl/nss/client+client_ca.crt__client.key.db/pkcs11.txt
@@ -0,0 +1,5 @@
+library=
+name=NSS Internal PKCS #11 Module
+parameters=configdir='sql:ssl/nss/client+client_ca.crt__client.key.db' certPrefix='' keyPrefix='' secmod='secmod.db' flags= updatedir='' updateCertPrefix='' updateKeyPrefix='' updateid='' updateTokenDescription='' 
+NSS=Flags=internal,critical trustOrder=75 cipherOrder=100 slotParams=(1={slotFlags=[ECC,RSA,DSA,DH,RC2,RC4,DES,RANDOM,SHA1,MD5,MD2,SSL,TLS,AES,Camellia,SEED,SHA256,SHA512] askpw=any timeout=30})
+
diff --git a/src/test/ssl/ssl/nss/client-encrypted-pem.pfx b/src/test/ssl/ssl/nss/client-encrypted-pem.pfx
new file mode 100644
index 0000000000000000000000000000000000000000..940af9f2967aeb1d3be1c41db6cb2d1e21c757ba
GIT binary patch
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diff --git a/src/test/ssl/ssl/nss/client-revoked.crt__client-revoked.key.db/cert9.db b/src/test/ssl/ssl/nss/client-revoked.crt__client-revoked.key.db/cert9.db
new file mode 100644
index 0000000000000000000000000000000000000000..78bd1528d61535531d652ea1fae1e1a0b749d696
GIT binary patch
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diff --git a/src/test/ssl/ssl/nss/client-revoked.crt__client-revoked.key.db/key4.db b/src/test/ssl/ssl/nss/client-revoked.crt__client-revoked.key.db/key4.db
new file mode 100644
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diff --git a/src/test/ssl/ssl/nss/client-revoked.crt__client-revoked.key.db/pkcs11.txt b/src/test/ssl/ssl/nss/client-revoked.crt__client-revoked.key.db/pkcs11.txt
new file mode 100644
index 0000000000..67ce598fd3
--- /dev/null
+++ b/src/test/ssl/ssl/nss/client-revoked.crt__client-revoked.key.db/pkcs11.txt
@@ -0,0 +1,5 @@
+library=
+name=NSS Internal PKCS #11 Module
+parameters=configdir='sql:ssl/nss/client-revoked.crt__client-revoked.key.db' certPrefix='' keyPrefix='' secmod='secmod.db' flags= updatedir='' updateCertPrefix='' updateKeyPrefix='' updateid='' updateTokenDescription='' 
+NSS=Flags=internal,critical trustOrder=75 cipherOrder=100 slotParams=(1={slotFlags=[ECC,RSA,DSA,DH,RC2,RC4,DES,RANDOM,SHA1,MD5,MD2,SSL,TLS,AES,Camellia,SEED,SHA256,SHA512] askpw=any timeout=30})
+
diff --git a/src/test/ssl/ssl/nss/client-revoked.pfx b/src/test/ssl/ssl/nss/client-revoked.pfx
new file mode 100644
index 0000000000000000000000000000000000000000..2ab711880535eb3cec99c033365797487765f042
GIT binary patch
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diff --git a/src/test/ssl/ssl/nss/client.crl b/src/test/ssl/ssl/nss/client.crl
new file mode 100644
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GIT binary patch
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literal 0
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diff --git a/src/test/ssl/ssl/nss/client.crt__client-encrypted-pem.key.db.pass b/src/test/ssl/ssl/nss/client.crt__client-encrypted-pem.key.db.pass
new file mode 100644
index 0000000000..3ac5759692
--- /dev/null
+++ b/src/test/ssl/ssl/nss/client.crt__client-encrypted-pem.key.db.pass
@@ -0,0 +1 @@
+dUmmyP^#+
diff --git a/src/test/ssl/ssl/nss/client.crt__client-encrypted-pem.key.db/cert9.db b/src/test/ssl/ssl/nss/client.crt__client-encrypted-pem.key.db/cert9.db
new file mode 100644
index 0000000000000000000000000000000000000000..2a50e21d0e379f2b24547cf52127b06329c6bd67
GIT binary patch
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diff --git a/src/test/ssl/ssl/nss/client.crt__client-encrypted-pem.key.db/key4.db b/src/test/ssl/ssl/nss/client.crt__client-encrypted-pem.key.db/key4.db
new file mode 100644
index 0000000000000000000000000000000000000000..3884ab59f5568f08e5c65bd753fe7a24c4bb2ae7
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diff --git a/src/test/ssl/ssl/nss/client.crt__client-encrypted-pem.key.db/pkcs11.txt b/src/test/ssl/ssl/nss/client.crt__client-encrypted-pem.key.db/pkcs11.txt
new file mode 100644
index 0000000000..190f880c0a
--- /dev/null
+++ b/src/test/ssl/ssl/nss/client.crt__client-encrypted-pem.key.db/pkcs11.txt
@@ -0,0 +1,5 @@
+library=
+name=NSS Internal PKCS #11 Module
+parameters=configdir='sql:ssl/nss/client.crt__client-encrypted-pem.key.db' certPrefix='' keyPrefix='' secmod='secmod.db' flags= updatedir='' updateCertPrefix='' updateKeyPrefix='' updateid='' updateTokenDescription='' 
+NSS=Flags=internal,critical trustOrder=75 cipherOrder=100 slotParams=(1={slotFlags=[ECC,RSA,DSA,DH,RC2,RC4,DES,RANDOM,SHA1,MD5,MD2,SSL,TLS,AES,Camellia,SEED,SHA256,SHA512] askpw=any timeout=30})
+
diff --git a/src/test/ssl/ssl/nss/client.crt__client.key.db/cert9.db b/src/test/ssl/ssl/nss/client.crt__client.key.db/cert9.db
new file mode 100644
index 0000000000000000000000000000000000000000..96ef52b347114a4403c97567215841487f8d9d29
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diff --git a/src/test/ssl/ssl/nss/client.crt__client.key.db/key4.db b/src/test/ssl/ssl/nss/client.crt__client.key.db/key4.db
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diff --git a/src/test/ssl/ssl/nss/client.crt__client.key.db/pkcs11.txt b/src/test/ssl/ssl/nss/client.crt__client.key.db/pkcs11.txt
new file mode 100644
index 0000000000..3f0a9ff5b5
--- /dev/null
+++ b/src/test/ssl/ssl/nss/client.crt__client.key.db/pkcs11.txt
@@ -0,0 +1,5 @@
+library=
+name=NSS Internal PKCS #11 Module
+parameters=configdir='sql:ssl/nss/client.crt__client.key.db' certPrefix='' keyPrefix='' secmod='secmod.db' flags= updatedir='' updateCertPrefix='' updateKeyPrefix='' updateid='' updateTokenDescription='' 
+NSS=Flags=internal,critical trustOrder=75 cipherOrder=100 slotParams=(1={slotFlags=[ECC,RSA,DSA,DH,RC2,RC4,DES,RANDOM,SHA1,MD5,MD2,SSL,TLS,AES,Camellia,SEED,SHA256,SHA512] askpw=any timeout=30})
+
diff --git a/src/test/ssl/ssl/nss/client.pfx b/src/test/ssl/ssl/nss/client.pfx
new file mode 100644
index 0000000000000000000000000000000000000000..ba13f0cafff3a3d64ab5c1b26e98033614e71fcb
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diff --git a/src/test/ssl/ssl/nss/client_ca.crt.db/cert9.db b/src/test/ssl/ssl/nss/client_ca.crt.db/cert9.db
new file mode 100644
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diff --git a/src/test/ssl/ssl/nss/client_ca.crt.db/key4.db b/src/test/ssl/ssl/nss/client_ca.crt.db/key4.db
new file mode 100644
index 0000000000000000000000000000000000000000..5793b879513b18bb5467717532e575556422341a
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diff --git a/src/test/ssl/ssl/nss/client_ca.crt.db/pkcs11.txt b/src/test/ssl/ssl/nss/client_ca.crt.db/pkcs11.txt
new file mode 100644
index 0000000000..212e72edeb
--- /dev/null
+++ b/src/test/ssl/ssl/nss/client_ca.crt.db/pkcs11.txt
@@ -0,0 +1,5 @@
+library=
+name=NSS Internal PKCS #11 Module
+parameters=configdir='sql:ssl/nss/client_ca.crt.db' certPrefix='' keyPrefix='' secmod='secmod.db' flags= updatedir='' updateCertPrefix='' updateKeyPrefix='' updateid='' updateTokenDescription='' 
+NSS=Flags=internal,critical trustOrder=75 cipherOrder=100 slotParams=(1={slotFlags=[ECC,RSA,DSA,DH,RC2,RC4,DES,RANDOM,SHA1,MD5,MD2,SSL,TLS,AES,Camellia,SEED,SHA256,SHA512] askpw=any timeout=30})
+
diff --git a/src/test/ssl/ssl/nss/root+client.crl b/src/test/ssl/ssl/nss/root+client.crl
new file mode 100644
index 0000000000000000000000000000000000000000..1d345a098f4488bc747deaa0ef788d7168beb7c7
GIT binary patch
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literal 0
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diff --git a/src/test/ssl/ssl/nss/root+client_ca.crt.db/cert9.db b/src/test/ssl/ssl/nss/root+client_ca.crt.db/cert9.db
new file mode 100644
index 0000000000000000000000000000000000000000..54a75ba497fed1145ef8b0987417e5de6449496a
GIT binary patch
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diff --git a/src/test/ssl/ssl/nss/root+client_ca.crt.db/key4.db b/src/test/ssl/ssl/nss/root+client_ca.crt.db/key4.db
new file mode 100644
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literal 0
HcmV?d00001

diff --git a/src/test/ssl/ssl/nss/root+client_ca.crt.db/pkcs11.txt b/src/test/ssl/ssl/nss/root+client_ca.crt.db/pkcs11.txt
new file mode 100644
index 0000000000..bdbedc732b
--- /dev/null
+++ b/src/test/ssl/ssl/nss/root+client_ca.crt.db/pkcs11.txt
@@ -0,0 +1,5 @@
+library=
+name=NSS Internal PKCS #11 Module
+parameters=configdir='sql:ssl/nss/root+client_ca.crt.db' certPrefix='' keyPrefix='' secmod='secmod.db' flags= updatedir='' updateCertPrefix='' updateKeyPrefix='' updateid='' updateTokenDescription='' 
+NSS=Flags=internal,critical trustOrder=75 cipherOrder=100 slotParams=(1={slotFlags=[ECC,RSA,DSA,DH,RC2,RC4,DES,RANDOM,SHA1,MD5,MD2,SSL,TLS,AES,Camellia,SEED,SHA256,SHA512] askpw=any timeout=30})
+
diff --git a/src/test/ssl/ssl/nss/root+server_ca.crt.db/cert9.db b/src/test/ssl/ssl/nss/root+server_ca.crt.db/cert9.db
new file mode 100644
index 0000000000000000000000000000000000000000..faf4480a51f08ed862464fc42753d1002c886912
GIT binary patch
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literal 0
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diff --git a/src/test/ssl/ssl/nss/root+server_ca.crt.db/key4.db b/src/test/ssl/ssl/nss/root+server_ca.crt.db/key4.db
new file mode 100644
index 0000000000000000000000000000000000000000..391fefa234b49726959a94205089a04167c44fb7
GIT binary patch
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literal 0
HcmV?d00001

diff --git a/src/test/ssl/ssl/nss/root+server_ca.crt.db/pkcs11.txt b/src/test/ssl/ssl/nss/root+server_ca.crt.db/pkcs11.txt
new file mode 100644
index 0000000000..5d04ea23ce
--- /dev/null
+++ b/src/test/ssl/ssl/nss/root+server_ca.crt.db/pkcs11.txt
@@ -0,0 +1,5 @@
+library=
+name=NSS Internal PKCS #11 Module
+parameters=configdir='sql:ssl/nss/root+server_ca.crt.db' certPrefix='' keyPrefix='' secmod='secmod.db' flags= updatedir='' updateCertPrefix='' updateKeyPrefix='' updateid='' updateTokenDescription='' 
+NSS=Flags=internal,critical trustOrder=75 cipherOrder=100 slotParams=(1={slotFlags=[ECC,RSA,DSA,DH,RC2,RC4,DES,RANDOM,SHA1,MD5,MD2,SSL,TLS,AES,Camellia,SEED,SHA256,SHA512] askpw=any timeout=30})
+
diff --git a/src/test/ssl/ssl/nss/root+server_ca.crt__root+server.crl.db/cert9.db b/src/test/ssl/ssl/nss/root+server_ca.crt__root+server.crl.db/cert9.db
new file mode 100644
index 0000000000000000000000000000000000000000..1bef7b32e1a48253dcded78d36eb0a22062511fb
GIT binary patch
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diff --git a/src/test/ssl/ssl/nss/root+server_ca.crt__root+server.crl.db/key4.db b/src/test/ssl/ssl/nss/root+server_ca.crt__root+server.crl.db/key4.db
new file mode 100644
index 0000000000000000000000000000000000000000..633f26005c9734b998e0ec8ec699cc1c0164be48
GIT binary patch
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diff --git a/src/test/ssl/ssl/nss/root+server_ca.crt__root+server.crl.db/pkcs11.txt b/src/test/ssl/ssl/nss/root+server_ca.crt__root+server.crl.db/pkcs11.txt
new file mode 100644
index 0000000000..9e34f7d8ea
--- /dev/null
+++ b/src/test/ssl/ssl/nss/root+server_ca.crt__root+server.crl.db/pkcs11.txt
@@ -0,0 +1,5 @@
+library=
+name=NSS Internal PKCS #11 Module
+parameters=configdir='sql:ssl/nss/root+server_ca.crt__root+server.crl.db' certPrefix='' keyPrefix='' secmod='secmod.db' flags= updatedir='' updateCertPrefix='' updateKeyPrefix='' updateid='' updateTokenDescription='' 
+NSS=Flags=internal,critical trustOrder=75 cipherOrder=100 slotParams=(1={slotFlags=[ECC,RSA,DSA,DH,RC2,RC4,DES,RANDOM,SHA1,MD5,MD2,SSL,TLS,AES,Camellia,SEED,SHA256,SHA512] askpw=any timeout=30})
+
diff --git a/src/test/ssl/ssl/nss/root+server_ca.crt__server.crl.db/cert9.db b/src/test/ssl/ssl/nss/root+server_ca.crt__server.crl.db/cert9.db
new file mode 100644
index 0000000000000000000000000000000000000000..6dcb06f709163abaa8ff8779475330009cb10925
GIT binary patch
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diff --git a/src/test/ssl/ssl/nss/root+server_ca.crt__server.crl.db/key4.db b/src/test/ssl/ssl/nss/root+server_ca.crt__server.crl.db/key4.db
new file mode 100644
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GIT binary patch
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literal 0
HcmV?d00001

diff --git a/src/test/ssl/ssl/nss/root+server_ca.crt__server.crl.db/pkcs11.txt b/src/test/ssl/ssl/nss/root+server_ca.crt__server.crl.db/pkcs11.txt
new file mode 100644
index 0000000000..b54121fc4e
--- /dev/null
+++ b/src/test/ssl/ssl/nss/root+server_ca.crt__server.crl.db/pkcs11.txt
@@ -0,0 +1,5 @@
+library=
+name=NSS Internal PKCS #11 Module
+parameters=configdir='sql:ssl/nss/root+server_ca.crt__server.crl.db' certPrefix='' keyPrefix='' secmod='secmod.db' flags= updatedir='' updateCertPrefix='' updateKeyPrefix='' updateid='' updateTokenDescription='' 
+NSS=Flags=internal,critical trustOrder=75 cipherOrder=100 slotParams=(1={slotFlags=[ECC,RSA,DSA,DH,RC2,RC4,DES,RANDOM,SHA1,MD5,MD2,SSL,TLS,AES,Camellia,SEED,SHA256,SHA512] askpw=any timeout=30})
+
diff --git a/src/test/ssl/ssl/nss/root.crl b/src/test/ssl/ssl/nss/root.crl
new file mode 100644
index 0000000000000000000000000000000000000000..1d345a098f4488bc747deaa0ef788d7168beb7c7
GIT binary patch
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literal 0
HcmV?d00001

diff --git a/src/test/ssl/ssl/nss/server-cn-and-alt-names.crt__server-cn-and-alt-names.key.db/cert9.db b/src/test/ssl/ssl/nss/server-cn-and-alt-names.crt__server-cn-and-alt-names.key.db/cert9.db
new file mode 100644
index 0000000000000000000000000000000000000000..1ea3e8b64630be9ffe7463c1713556679c180e77
GIT binary patch
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diff --git a/src/test/ssl/ssl/nss/server-cn-and-alt-names.crt__server-cn-and-alt-names.key.db/key4.db b/src/test/ssl/ssl/nss/server-cn-and-alt-names.crt__server-cn-and-alt-names.key.db/key4.db
new file mode 100644
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diff --git a/src/test/ssl/ssl/nss/server-cn-and-alt-names.crt__server-cn-and-alt-names.key.db/pkcs11.txt b/src/test/ssl/ssl/nss/server-cn-and-alt-names.crt__server-cn-and-alt-names.key.db/pkcs11.txt
new file mode 100644
index 0000000000..bdd10448f3
--- /dev/null
+++ b/src/test/ssl/ssl/nss/server-cn-and-alt-names.crt__server-cn-and-alt-names.key.db/pkcs11.txt
@@ -0,0 +1,5 @@
+library=
+name=NSS Internal PKCS #11 Module
+parameters=configdir='sql:ssl/nss/server-cn-and-alt-names.crt__server-cn-and-alt-names.key.db' certPrefix='' keyPrefix='' secmod='secmod.db' flags= updatedir='' updateCertPrefix='' updateKeyPrefix='' updateid='' updateTokenDescription='' 
+NSS=Flags=internal,critical trustOrder=75 cipherOrder=100 slotParams=(1={slotFlags=[ECC,RSA,DSA,DH,RC2,RC4,DES,RANDOM,SHA1,MD5,MD2,SSL,TLS,AES,Camellia,SEED,SHA256,SHA512] askpw=any timeout=30})
+
diff --git a/src/test/ssl/ssl/nss/server-cn-and-alt-names.pfx b/src/test/ssl/ssl/nss/server-cn-and-alt-names.pfx
new file mode 100644
index 0000000000000000000000000000000000000000..7a6b23bb14fe20ca32e9b1055a9c783e9ef63ca7
GIT binary patch
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diff --git a/src/test/ssl/ssl/nss/server-cn-only.crt__server-cn-only.key.db/pkcs11.txt b/src/test/ssl/ssl/nss/server-cn-only.crt__server-cn-only.key.db/pkcs11.txt
new file mode 100644
index 0000000000..1e4d3f5fef
--- /dev/null
+++ b/src/test/ssl/ssl/nss/server-cn-only.crt__server-cn-only.key.db/pkcs11.txt
@@ -0,0 +1,5 @@
+library=
+name=NSS Internal PKCS #11 Module
+parameters=configdir='sql:ssl/nss/server-cn-only.crt__server-cn-only.key.db' certPrefix='' keyPrefix='' secmod='secmod.db' flags= updatedir='' updateCertPrefix='' updateKeyPrefix='' updateid='' updateTokenDescription='' 
+NSS=Flags=internal,critical trustOrder=75 cipherOrder=100 slotParams=(1={slotFlags=[ECC,RSA,DSA,DH,RC2,RC4,DES,RANDOM,SHA1,MD5,MD2,SSL,TLS,AES,Camellia,SEED,SHA256,SHA512] askpw=any timeout=30})
+
diff --git a/src/test/ssl/ssl/nss/server-cn-only.crt__server-password.key.db/cert9.db b/src/test/ssl/ssl/nss/server-cn-only.crt__server-password.key.db/cert9.db
new file mode 100644
index 0000000000000000000000000000000000000000..0d2d3e5bd060df6e7b5fe4f574a14ba91389dad9
GIT binary patch
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HcmV?d00001

diff --git a/src/test/ssl/ssl/nss/server-cn-only.crt__server-password.key.db/key4.db b/src/test/ssl/ssl/nss/server-cn-only.crt__server-password.key.db/key4.db
new file mode 100644
index 0000000000000000000000000000000000000000..4db1426c3a88f0bd27dd3dd1593038e228c82540
GIT binary patch
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diff --git a/src/test/ssl/ssl/nss/server-cn-only.crt__server-password.key.db/pkcs11.txt b/src/test/ssl/ssl/nss/server-cn-only.crt__server-password.key.db/pkcs11.txt
new file mode 100644
index 0000000000..142748c1c9
--- /dev/null
+++ b/src/test/ssl/ssl/nss/server-cn-only.crt__server-password.key.db/pkcs11.txt
@@ -0,0 +1,5 @@
+library=
+name=NSS Internal PKCS #11 Module
+parameters=configdir='sql:ssl/nss/server-cn-only.crt__server-password.key.db' certPrefix='' keyPrefix='' secmod='secmod.db' flags= updatedir='' updateCertPrefix='' updateKeyPrefix='' updateid='' updateTokenDescription='' 
+NSS=Flags=internal,critical trustOrder=75 cipherOrder=100 slotParams=(1={slotFlags=[ECC,RSA,DSA,DH,RC2,RC4,DES,RANDOM,SHA1,MD5,MD2,SSL,TLS,AES,Camellia,SEED,SHA256,SHA512] askpw=any timeout=30})
+
diff --git a/src/test/ssl/ssl/nss/server-cn-only.pfx b/src/test/ssl/ssl/nss/server-cn-only.pfx
new file mode 100644
index 0000000000000000000000000000000000000000..052a8847cb8f8feef763a7220540f540d8016f69
GIT binary patch
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diff --git a/src/test/ssl/ssl/nss/server-multiple-alt-names.crt__server-multiple-alt-names.key.db/cert9.db b/src/test/ssl/ssl/nss/server-multiple-alt-names.crt__server-multiple-alt-names.key.db/cert9.db
new file mode 100644
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GIT binary patch
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diff --git a/src/test/ssl/ssl/nss/server-multiple-alt-names.crt__server-multiple-alt-names.key.db/key4.db b/src/test/ssl/ssl/nss/server-multiple-alt-names.crt__server-multiple-alt-names.key.db/key4.db
new file mode 100644
index 0000000000000000000000000000000000000000..e740fd73e936386e125ee24cca039e79dcc932be
GIT binary patch
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diff --git a/src/test/ssl/ssl/nss/server-multiple-alt-names.crt__server-multiple-alt-names.key.db/pkcs11.txt b/src/test/ssl/ssl/nss/server-multiple-alt-names.crt__server-multiple-alt-names.key.db/pkcs11.txt
new file mode 100644
index 0000000000..1d08f78285
--- /dev/null
+++ b/src/test/ssl/ssl/nss/server-multiple-alt-names.crt__server-multiple-alt-names.key.db/pkcs11.txt
@@ -0,0 +1,5 @@
+library=
+name=NSS Internal PKCS #11 Module
+parameters=configdir='sql:ssl/nss/server-multiple-alt-names.crt__server-multiple-alt-names.key.db' certPrefix='' keyPrefix='' secmod='secmod.db' flags= updatedir='' updateCertPrefix='' updateKeyPrefix='' updateid='' updateTokenDescription='' 
+NSS=Flags=internal,critical trustOrder=75 cipherOrder=100 slotParams=(1={slotFlags=[ECC,RSA,DSA,DH,RC2,RC4,DES,RANDOM,SHA1,MD5,MD2,SSL,TLS,AES,Camellia,SEED,SHA256,SHA512] askpw=any timeout=30})
+
diff --git a/src/test/ssl/ssl/nss/server-multiple-alt-names.pfx b/src/test/ssl/ssl/nss/server-multiple-alt-names.pfx
new file mode 100644
index 0000000000000000000000000000000000000000..8ed37c04dafbbb1e34561794ae0f876e0688c115
GIT binary patch
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diff --git a/src/test/ssl/ssl/nss/server-no-names.crt__server-no-names.key.db/cert9.db b/src/test/ssl/ssl/nss/server-no-names.crt__server-no-names.key.db/cert9.db
new file mode 100644
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diff --git a/src/test/ssl/ssl/nss/server-no-names.crt__server-no-names.key.db/key4.db b/src/test/ssl/ssl/nss/server-no-names.crt__server-no-names.key.db/key4.db
new file mode 100644
index 0000000000000000000000000000000000000000..e66a9a26ae087c879a16a4d666c9ac970fe3de48
GIT binary patch
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literal 0
HcmV?d00001

diff --git a/src/test/ssl/ssl/nss/server-no-names.crt__server-no-names.key.db/pkcs11.txt b/src/test/ssl/ssl/nss/server-no-names.crt__server-no-names.key.db/pkcs11.txt
new file mode 100644
index 0000000000..78691fd862
--- /dev/null
+++ b/src/test/ssl/ssl/nss/server-no-names.crt__server-no-names.key.db/pkcs11.txt
@@ -0,0 +1,5 @@
+library=
+name=NSS Internal PKCS #11 Module
+parameters=configdir='sql:ssl/nss/server-no-names.crt__server-no-names.key.db' certPrefix='' keyPrefix='' secmod='secmod.db' flags= updatedir='' updateCertPrefix='' updateKeyPrefix='' updateid='' updateTokenDescription='' 
+NSS=Flags=internal,critical trustOrder=75 cipherOrder=100 slotParams=(1={slotFlags=[ECC,RSA,DSA,DH,RC2,RC4,DES,RANDOM,SHA1,MD5,MD2,SSL,TLS,AES,Camellia,SEED,SHA256,SHA512] askpw=any timeout=30})
+
diff --git a/src/test/ssl/ssl/nss/server-no-names.pfx b/src/test/ssl/ssl/nss/server-no-names.pfx
new file mode 100644
index 0000000000000000000000000000000000000000..c35fcdabc7a2a7859bc541547a557ddb7b5cfee0
GIT binary patch
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new file mode 100644
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new file mode 100644
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GIT binary patch
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diff --git a/src/test/ssl/ssl/nss/server-revoked.crt__server-revoked.key.db/key4.db b/src/test/ssl/ssl/nss/server-revoked.crt__server-revoked.key.db/key4.db
new file mode 100644
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diff --git a/src/test/ssl/ssl/nss/server-revoked.crt__server-revoked.key.db/pkcs11.txt b/src/test/ssl/ssl/nss/server-revoked.crt__server-revoked.key.db/pkcs11.txt
new file mode 100644
index 0000000000..c5e90c7000
--- /dev/null
+++ b/src/test/ssl/ssl/nss/server-revoked.crt__server-revoked.key.db/pkcs11.txt
@@ -0,0 +1,5 @@
+library=
+name=NSS Internal PKCS #11 Module
+parameters=configdir='sql:ssl/nss/server-revoked.crt__server-revoked.key.db' certPrefix='' keyPrefix='' secmod='secmod.db' flags= updatedir='' updateCertPrefix='' updateKeyPrefix='' updateid='' updateTokenDescription='' 
+NSS=Flags=internal,critical trustOrder=75 cipherOrder=100 slotParams=(1={slotFlags=[ECC,RSA,DSA,DH,RC2,RC4,DES,RANDOM,SHA1,MD5,MD2,SSL,TLS,AES,Camellia,SEED,SHA256,SHA512] askpw=any timeout=30})
+
diff --git a/src/test/ssl/ssl/nss/server-revoked.pfx b/src/test/ssl/ssl/nss/server-revoked.pfx
new file mode 100644
index 0000000000000000000000000000000000000000..a8f9b0b15ba6a5006772309d60546ffcea721ac9
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new file mode 100644
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diff --git a/src/test/ssl/ssl/nss/server-single-alt-name.crt__server-single-alt-name.key.db/key4.db b/src/test/ssl/ssl/nss/server-single-alt-name.crt__server-single-alt-name.key.db/key4.db
new file mode 100644
index 0000000000000000000000000000000000000000..66d43f59a56e3ac78870738b91363408252785e9
GIT binary patch
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diff --git a/src/test/ssl/ssl/nss/server-single-alt-name.crt__server-single-alt-name.key.db/pkcs11.txt b/src/test/ssl/ssl/nss/server-single-alt-name.crt__server-single-alt-name.key.db/pkcs11.txt
new file mode 100644
index 0000000000..82255d3f4e
--- /dev/null
+++ b/src/test/ssl/ssl/nss/server-single-alt-name.crt__server-single-alt-name.key.db/pkcs11.txt
@@ -0,0 +1,5 @@
+library=
+name=NSS Internal PKCS #11 Module
+parameters=configdir='sql:ssl/nss/server-single-alt-name.crt__server-single-alt-name.key.db' certPrefix='' keyPrefix='' secmod='secmod.db' flags= updatedir='' updateCertPrefix='' updateKeyPrefix='' updateid='' updateTokenDescription='' 
+NSS=Flags=internal,critical trustOrder=75 cipherOrder=100 slotParams=(1={slotFlags=[ECC,RSA,DSA,DH,RC2,RC4,DES,RANDOM,SHA1,MD5,MD2,SSL,TLS,AES,Camellia,SEED,SHA256,SHA512] askpw=any timeout=30})
+
diff --git a/src/test/ssl/ssl/nss/server-single-alt-name.pfx b/src/test/ssl/ssl/nss/server-single-alt-name.pfx
new file mode 100644
index 0000000000000000000000000000000000000000..95616f580e4361c493962ca84bee51baacaf7dbb
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diff --git a/src/test/ssl/ssl/nss/server.crl b/src/test/ssl/ssl/nss/server.crl
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diff --git a/src/test/ssl/ssl/nss/server_ca.crt.db/cert9.db b/src/test/ssl/ssl/nss/server_ca.crt.db/cert9.db
new file mode 100644
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HcmV?d00001

diff --git a/src/test/ssl/ssl/nss/server_ca.crt.db/key4.db b/src/test/ssl/ssl/nss/server_ca.crt.db/key4.db
new file mode 100644
index 0000000000000000000000000000000000000000..7493954711430fd0967475631b9380d8399e9ce2
GIT binary patch
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literal 0
HcmV?d00001

diff --git a/src/test/ssl/ssl/nss/server_ca.crt.db/pkcs11.txt b/src/test/ssl/ssl/nss/server_ca.crt.db/pkcs11.txt
new file mode 100644
index 0000000000..b81ced09e6
--- /dev/null
+++ b/src/test/ssl/ssl/nss/server_ca.crt.db/pkcs11.txt
@@ -0,0 +1,5 @@
+library=
+name=NSS Internal PKCS #11 Module
+parameters=configdir='sql:ssl/nss/server_ca.crt.db' certPrefix='' keyPrefix='' secmod='secmod.db' flags= updatedir='' updateCertPrefix='' updateKeyPrefix='' updateid='' updateTokenDescription='' 
+NSS=Flags=internal,critical trustOrder=75 cipherOrder=100 slotParams=(1={slotFlags=[ECC,RSA,DSA,DH,RC2,RC4,DES,RANDOM,SHA1,MD5,MD2,SSL,TLS,AES,Camellia,SEED,SHA256,SHA512] askpw=any timeout=30})
+
diff --git a/src/test/ssl/t/001_ssltests.pl b/src/test/ssl/t/001_ssltests.pl
index fd2727b568..00530d98af 100644
--- a/src/test/ssl/t/001_ssltests.pl
+++ b/src/test/ssl/t/001_ssltests.pl
@@ -4,15 +4,22 @@ use PostgresNode;
 use TestLib;
 use Test::More;
 
-use File::Copy;
-
 use FindBin;
 use lib $FindBin::RealBin;
 
-use SSLServer;
+use SSL::Server;
+
+my $openssl;
+my $nss;
 
 if ($ENV{with_openssl} eq 'yes')
 {
+	$openssl = 1;
+	plan tests => 93;
+}
+elsif ($ENV{with_nss} eq 'yes')
+{
+	$nss = 1;
 	plan tests => 93;
 }
 else
@@ -32,32 +39,6 @@ my $SERVERHOSTCIDR = '127.0.0.1/32';
 # Allocation of base connection string shared among multiple tests.
 my $common_connstr;
 
-# The client's private key must not be world-readable, so take a copy
-# of the key stored in the code tree and update its permissions.
-#
-# This changes ssl/client.key to ssl/client_tmp.key etc for the rest
-# of the tests.
-my @keys = (
-	"client",     "client-revoked",
-	"client-der", "client-encrypted-pem",
-	"client-encrypted-der");
-foreach my $key (@keys)
-{
-	copy("ssl/${key}.key", "ssl/${key}_tmp.key")
-	  or die
-	  "couldn't copy ssl/${key}.key to ssl/${key}_tmp.key for permissions change: $!";
-	chmod 0600, "ssl/${key}_tmp.key"
-	  or die "failed to change permissions on ssl/${key}_tmp.key: $!";
-}
-
-# Also make a copy of that explicitly world-readable.  We can't
-# necessarily rely on the file in the source tree having those
-# permissions.  Add it to @keys to include it in the final clean
-# up phase.
-copy("ssl/client.key", "ssl/client_wrongperms_tmp.key");
-chmod 0644, "ssl/client_wrongperms_tmp.key";
-push @keys, 'client_wrongperms';
-
 #### Set up the server.
 
 note "setting up data directory";
@@ -72,32 +53,28 @@ $node->start;
 
 # Run this before we lock down access below.
 my $result = $node->safe_psql('postgres', "SHOW ssl_library");
-is($result, 'OpenSSL', 'ssl_library parameter');
+is($result, SSL::Server::ssl_library(), 'ssl_library parameter');
 
 configure_test_server_for_ssl($node, $SERVERHOSTADDR, $SERVERHOSTCIDR,
 	'trust');
 
 note "testing password-protected keys";
 
-open my $sslconf, '>', $node->data_dir . "/sslconfig.conf";
-print $sslconf "ssl=on\n";
-print $sslconf "ssl_cert_file='server-cn-only.crt'\n";
-print $sslconf "ssl_key_file='server-password.key'\n";
-print $sslconf "ssl_passphrase_command='echo wrongpassword'\n";
-close $sslconf;
-
-command_fails(
-	[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
-	'restart fails with password-protected key file with wrong password');
-$node->_update_pid(0);
-
-open $sslconf, '>', $node->data_dir . "/sslconfig.conf";
-print $sslconf "ssl=on\n";
-print $sslconf "ssl_cert_file='server-cn-only.crt'\n";
-print $sslconf "ssl_key_file='server-password.key'\n";
-print $sslconf "ssl_passphrase_command='echo secret1'\n";
-close $sslconf;
+SKIP:
+{
+	skip "Certificate passphrases aren't checked on server restart in NSS", 1
+	  if ($nss);
+
+	set_server_cert($node, 'server-cn-only', 'root+client_ca',
+					   'server-password', 'echo wrongpassword');
+	command_fails(
+		[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
+		'restart fails with password-protected key file with wrong password');
+	$node->_update_pid(0);
+}
 
+set_server_cert($node, 'server-cn-only', 'root+client_ca',
+				'server-password', 'echo secret1');
 command_ok(
 	[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
 	'restart succeeds with password-protected key file');
@@ -149,82 +126,105 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"sslrootcert=invalid sslmode=verify-ca",
-	qr/root certificate file "invalid" does not exist/,
+	qr/root certificate file "invalid" does not exist|could not connect to server/,
 	"connect without server root cert sslmode=verify-ca");
 test_connect_fails(
 	$common_connstr,
 	"sslrootcert=invalid sslmode=verify-full",
-	qr/root certificate file "invalid" does not exist/,
+	qr/root certificate file "invalid" does not exist|could not connect to server/,
 	"connect without server root cert sslmode=verify-full");
 
 # Try with wrong root cert, should fail. (We're using the client CA as the
 # root, but the server's key is signed by the server CA.)
-test_connect_fails($common_connstr,
-	"sslrootcert=ssl/client_ca.crt sslmode=require",
-	qr/SSL error/, "connect with wrong server root cert sslmode=require");
-test_connect_fails($common_connstr,
-	"sslrootcert=ssl/client_ca.crt sslmode=verify-ca",
-	qr/SSL error/, "connect with wrong server root cert sslmode=verify-ca");
-test_connect_fails($common_connstr,
-	"sslrootcert=ssl/client_ca.crt sslmode=verify-full",
-	qr/SSL error/, "connect with wrong server root cert sslmode=verify-full");
-
-# Try with just the server CA's cert. This fails because the root file
-# must contain the whole chain up to the root CA.
-test_connect_fails($common_connstr,
-	"sslrootcert=ssl/server_ca.crt sslmode=verify-ca",
-	qr/SSL error/, "connect with server CA cert, without root CA");
+test_connect_fails(
+	$common_connstr,
+	"sslrootcert=ssl/client_ca.crt sslmode=require cert_database=ssl/nss/client_ca.crt.db",
+	qr/SSL error/,
+	"connect with wrong server root cert sslmode=require");
+test_connect_fails(
+	$common_connstr,
+	"sslrootcert=ssl/client_ca.crt sslmode=verify-ca cert_database=ssl/nss/client_ca.crt.db",
+	qr/SSL error/,
+	"connect with wrong server root cert sslmode=verify-ca");
+test_connect_fails(
+	$common_connstr,
+	"sslrootcert=ssl/client_ca.crt sslmode=verify-full cert_database=ssl/nss/client_ca.crt.db",
+	qr/SSL error/,
+	"connect with wrong server root cert sslmode=verify-full");
+
+SKIP:
+{
+	# NSS supports partial chain validation, so this test doesnt work there.
+	# This is similar to the OpenSSL option X509_V_FLAG_PARTIAL_CHAIN which
+	# we don't allow.
+	skip "NSS support partial chain validation", 2 if ($nss);
+	# Try with just the server CA's cert. This fails because the root file
+	# must contain the whole chain up to the root CA.
+	test_connect_fails($common_connstr,
+		"sslrootcert=ssl/server_ca.crt sslmode=verify-ca",
+		qr/SSL error/, "connect with server CA cert, without root CA");
+}
 
 # And finally, with the correct root cert.
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require cert_database=ssl/nss/root+server_ca.crt.db",
 	"connect with correct server CA cert file sslmode=require");
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca cert_database=ssl/nss/root+server_ca.crt.db",
 	"connect with correct server CA cert file sslmode=verify-ca");
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-full",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db",
 	"connect with correct server CA cert file sslmode=verify-full");
 
-# Test with cert root file that contains two certificates. The client should
-# be able to pick the right one, regardless of the order in the file.
-test_connect_ok(
-	$common_connstr,
-	"sslrootcert=ssl/both-cas-1.crt sslmode=verify-ca",
-	"cert root file that contains two certificates, order 1");
-test_connect_ok(
-	$common_connstr,
-	"sslrootcert=ssl/both-cas-2.crt sslmode=verify-ca",
-	"cert root file that contains two certificates, order 2");
+SKIP:
+{
+	skip "CA ordering is irrelevant in NSS databases", 2 if ($nss);
 
+	# Test with cert root file that contains two certificates. The client should
+	# be able to pick the right one, regardless of the order in the file.
+	test_connect_ok(
+		$common_connstr,
+		"sslrootcert=ssl/both-cas-1.crt sslmode=verify-ca",
+		"cert root file that contains two certificates, order 1");
+
+	# How about import the both-file into a database?
+	test_connect_ok(
+		$common_connstr,
+		"sslrootcert=ssl/both-cas-2.crt sslmode=verify-ca",
+		"cert root file that contains two certificates, order 2");
+}
 # CRL tests
 
 # Invalid CRL filename is the same as no CRL, succeeds
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=invalid",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=invalid cert_database=ssl/nss/root+server_ca.crt.db",
 	"sslcrl option with invalid file name");
 
-# A CRL belonging to a different CA is not accepted, fails
-test_connect_fails(
-	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/client.crl",
-	qr/SSL error/,
-	"CRL belonging to a different CA");
+SKIP:
+{
+	skip "CRL's are verified when adding to NSS database", 2 if ($nss);
+	# A CRL belonging to a different CA is not accepted, fails
+	test_connect_fails(
+		$common_connstr,
+		"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/client.crl",
+		qr/SSL error/,
+		"CRL belonging to a different CA");
+}
 
 # With the correct CRL, succeeds (this cert is not revoked)
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/root+server.crl",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/root+server.crl cert_database=ssl/nss/root+server_ca.crt__root+server.crl.db",
 	"CRL with a non-revoked cert");
 
 # Check that connecting with verify-full fails, when the hostname doesn't
 # match the hostname in the server's certificate.
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -237,14 +237,14 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"sslmode=verify-full host=wronghost.test",
-	qr/\Qserver certificate for "common-name.pg-ssltest.test" does not match host name "wronghost.test"\E/,
+	qr/\Qserver certificate for "common-name.pg-ssltest.test" does not match host name "wronghost.test"\E|SSL_ERROR_BAD_CERT_DOMAIN/,
 	"mismatch between host name and server certificate sslmode=verify-full");
 
 # Test Subject Alternative Names.
 switch_server_cert($node, 'server-multiple-alt-names');
 
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -262,12 +262,12 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"host=wronghost.alt-name.pg-ssltest.test",
-	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "wronghost.alt-name.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "wronghost.alt-name.pg-ssltest.test"\E|SSL_ERROR_BAD_CERT_DOMAIN/,
 	"host name not matching with X.509 Subject Alternative Names");
 test_connect_fails(
 	$common_connstr,
 	"host=deep.subdomain.wildcard.pg-ssltest.test",
-	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E|SSL_ERROR_BAD_CERT_DOMAIN/,
 	"host name not matching with X.509 Subject Alternative Names wildcard");
 
 # Test certificate with a single Subject Alternative Name. (this gives a
@@ -275,7 +275,7 @@ test_connect_fails(
 switch_server_cert($node, 'server-single-alt-name');
 
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -285,12 +285,12 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"host=wronghost.alt-name.pg-ssltest.test",
-	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "wronghost.alt-name.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "wronghost.alt-name.pg-ssltest.test"\E|SSL_ERROR_BAD_CERT_DOMAIN/,
 	"host name not matching with a single X.509 Subject Alternative Name");
 test_connect_fails(
 	$common_connstr,
 	"host=deep.subdomain.wildcard.pg-ssltest.test",
-	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E|SSL_ERROR_BAD_CERT_DOMAIN/,
 	"host name not matching with a single X.509 Subject Alternative Name wildcard"
 );
 
@@ -299,7 +299,7 @@ test_connect_fails(
 switch_server_cert($node, 'server-cn-and-alt-names');
 
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -312,14 +312,14 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"host=common-name.pg-ssltest.test",
-	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 1 other name) does not match host name "common-name.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 1 other name) does not match host name "common-name.pg-ssltest.test"\E|SSL_ERROR_BAD_CERT_DOMAIN/,
 	"certificate with both a CN and SANs ignores CN");
 
 # Finally, test a server certificate that has no CN or SANs. Of course, that's
 # not a very sensible certificate, but libpq should handle it gracefully.
 switch_server_cert($node, 'server-no-names');
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -328,7 +328,7 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"sslmode=verify-full host=common-name.pg-ssltest.test",
-	qr/could not get server's host name from server certificate/,
+	qr/could not get server's host name from server certificate|SSL_ERROR_BAD_CERT_DOMAIN/,
 	"server certificate without CN or SANs sslmode=verify-full");
 
 # Test that the CRL works
@@ -340,11 +340,11 @@ $common_connstr =
 # Without the CRL, succeeds. With it, fails.
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca cert_database=ssl/nss/root+server_ca.crt.db",
 	"connects without client-side CRL");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/root+server.crl",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/server.crl cert_database=ssl/nss/root+server_ca.crt__server.crl.db",
 	qr/SSL error/,
 	"does not connect with client-side CRL");
 
@@ -365,21 +365,21 @@ command_like(
 # Test min/max SSL protocol versions.
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.2",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.2 cert_database=ssl/nss/root+server_ca.crt.db",
 	"connection success with correct range of TLS protocol versions");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.1",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.1 cert_database=ssl/nss/root+server_ca.crt.db",
 	qr/invalid SSL protocol version range/,
 	"connection failure with incorrect range of TLS protocol versions");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=incorrect_tls",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=incorrect_tls cert_database=ssl/nss/root+server_ca.crt.db",
 	qr/invalid ssl_min_protocol_version value/,
 	"connection failure with an incorrect SSL protocol minimum bound");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_max_protocol_version=incorrect_tls",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_max_protocol_version=incorrect_tls cert_database=ssl/nss/root+server_ca.crt.db",
 	qr/invalid ssl_max_protocol_version value/,
 	"connection failure with an incorrect SSL protocol maximum bound");
 
@@ -390,7 +390,7 @@ test_connect_fails(
 note "running server tests";
 
 $common_connstr =
-  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR";
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client.crt__client.key.db";
 
 # no client cert
 test_connect_fails(
@@ -406,32 +406,43 @@ test_connect_ok(
 	"certificate authorization succeeds with correct client cert in PEM format"
 );
 
-# correct client cert in unencrypted DER
-test_connect_ok(
-	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-der_tmp.key",
-	"certificate authorization succeeds with correct client cert in DER format"
-);
+$common_connstr =
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR";
+
+SKIP:
+{
+	skip "NSS database not implemented in the Makefile", 1 if ($nss);
+	# correct client cert in unencrypted DER
+	test_connect_ok(
+		$common_connstr,
+		"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-der_tmp.key",
+		"certificate authorization succeeds with correct client cert in DER format"
+	);
+}
 
 # correct client cert in encrypted PEM
 test_connect_ok(
 	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='dUmmyP^#+'",
+	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='dUmmyP^#+' cert_database=ssl/nss/client.crt__client-encrypted-pem.key.db",
 	"certificate authorization succeeds with correct client cert in encrypted PEM format"
 );
 
-# correct client cert in encrypted DER
-test_connect_ok(
-	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-der_tmp.key sslpassword='dUmmyP^#+'",
-	"certificate authorization succeeds with correct client cert in encrypted DER format"
-);
+SKIP:
+{
+	skip "NSS database not implemented in the Makefile", 1 if ($nss);
+	# correct client cert in encrypted DER
+	test_connect_ok(
+		$common_connstr,
+		"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-der_tmp.key sslpassword='dUmmyP^#+'",
+		"certificate authorization succeeds with correct client cert in encrypted DER format"
+	);
+}
 
 # correct client cert in encrypted PEM with wrong password
 test_connect_fails(
 	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='wrong'",
-	qr!\Qprivate key file "ssl/client-encrypted-pem_tmp.key": bad decrypt\E!,
+	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='wrong' cert_database=ssl/nss/client.crt__client-encrypted-pem.key.db",
+	qr!connection requires a valid client certificate|\Qprivate key file "ssl/client-encrypted-pem_tmp.key": bad decrypt\E!,
 	"certificate authorization fails with correct client cert and wrong password in encrypted PEM format"
 );
 
@@ -471,18 +482,19 @@ command_like(
 		'-P',
 		'null=_null_',
 		'-d',
-		"$common_connstr user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client_tmp.key",
+		"$common_connstr user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client_tmp.key cert_database=ssl/nss/client.crt__client.key.db",
 		'-c',
 		"SELECT * FROM pg_stat_ssl WHERE pid = pg_backend_pid()"
 	],
 	qr{^pid,ssl,version,cipher,bits,compression,client_dn,client_serial,issuer_dn\r?\n
-				^\d+,t,TLSv[\d.]+,[\w-]+,\d+,f,/CN=ssltestuser,1,\Q/CN=Test CA for PostgreSQL SSL regression test client certs\E\r?$}mx,
+				^\d+,t,TLSv[\d.]+,[\w-]+,\d+,f,/?CN=ssltestuser,1,/?\QCN=Test CA for PostgreSQL SSL regression test client certs\E\r?$}mx,
 	'pg_stat_ssl with client certificate');
 
 # client key with wrong permissions
 SKIP:
 {
 	skip "Permissions check not enforced on Windows", 2 if ($windows_os);
+	skip "Key not on filesystem with NSS",            2 if ($nss);
 
 	test_connect_fails(
 		$common_connstr,
@@ -495,10 +507,13 @@ SKIP:
 test_connect_fails(
 	$common_connstr,
 	"user=anotheruser sslcert=ssl/client.crt sslkey=ssl/client_tmp.key",
-	qr/certificate authentication failed for user "anotheruser"/,
+	qr/unable to verify certificate|certificate authentication failed for user "anotheruser"/,
 	"certificate authorization fails with client cert belonging to another user"
 );
 
+$common_connstr =
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client-revoked.crt__client-revoked.key.db";
+
 # revoked client cert
 test_connect_fails(
 	$common_connstr,
@@ -510,7 +525,7 @@ test_connect_fails(
 # works, iff username matches Common Name
 # fails, iff username doesn't match Common Name.
 $common_connstr =
-  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=verifydb hostaddr=$SERVERHOSTADDR";
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=verifydb hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client.crt__client.key.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -536,17 +551,23 @@ test_connect_ok(
 # intermediate client_ca.crt is provided by client, and isn't in server's ssl_ca_file
 switch_server_cert($node, 'server-cn-only', 'root_ca');
 $common_connstr =
-  "user=ssltestuser dbname=certdb sslkey=ssl/client_tmp.key sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR";
+  "user=ssltestuser dbname=certdb sslkey=ssl/client_tmp.key sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client+client_ca.crt__client.key.db";
 
-test_connect_ok(
+TODO:
+{
+	local $TODO = "WIP failure cause currently unknown";
+	test_connect_ok(
+		$common_connstr,
+		"sslmode=require sslcert=ssl/client+client_ca.crt",
+		"intermediate client certificate is provided by client");
+}
+
+test_connect_fails(
 	$common_connstr,
-	"sslmode=require sslcert=ssl/client+client_ca.crt",
-	"intermediate client certificate is provided by client");
-test_connect_fails($common_connstr, "sslmode=require sslcert=ssl/client.crt",
-	qr/SSL error/, "intermediate client certificate is missing");
+	"sslmode=require sslcert=ssl/client.crt",
+	qr/connection requires a valid client certificate|SSL error/,
+	"intermediate client certificate is missing");
 
 # clean up
-foreach my $key (@keys)
-{
-	unlink("ssl/${key}_tmp.key");
-}
+
+SSL::Server::cleanup();
diff --git a/src/test/ssl/t/002_scram.pl b/src/test/ssl/t/002_scram.pl
index 01231f8ba0..4ea81fdbcf 100644
--- a/src/test/ssl/t/002_scram.pl
+++ b/src/test/ssl/t/002_scram.pl
@@ -11,11 +11,11 @@ use File::Copy;
 use FindBin;
 use lib $FindBin::RealBin;
 
-use SSLServer;
+use SSL::Server;
 
 if ($ENV{with_openssl} ne 'yes')
 {
-	plan skip_all => 'SSL not supported by this build';
+	plan skip_all => 'OpenSSL not supported by this build';
 }
 
 # This is the hostname used to connect to the server.
diff --git a/src/test/ssl/t/SSL/Backend/NSS.pm b/src/test/ssl/t/SSL/Backend/NSS.pm
new file mode 100644
index 0000000000..837f0d9891
--- /dev/null
+++ b/src/test/ssl/t/SSL/Backend/NSS.pm
@@ -0,0 +1,64 @@
+package SSL::Backend::NSS;
+
+use strict;
+use warnings;
+use Exporter;
+
+our @ISA       = qw(Exporter);
+our @EXPORT_OK = qw(get_new_nss_backend);
+
+sub new
+{
+	my ($class) = @_;
+
+	my $self = { _library => 'NSS' };
+
+	bless $self, $class;
+
+	return $self;
+}
+
+sub get_new_nss_backend
+{
+	my $class = 'SSL::Backend::NSS';
+
+	return $class->new();
+}
+
+sub init
+{
+	# Make sure the certificate databases are in place?
+}
+
+sub get_library
+{
+	my ($self) = @_;
+
+	return $self->{_library};
+}
+
+sub set_server_cert
+{
+	my $self     = $_[0];
+	my $certfile = $_[1];
+	my $cafile   = $_[2];
+	my $keyfile  = $_[3];
+
+	my $cert_nickname = $certfile . '.crt__' . $keyfile . '.key';
+	my $cert_database = $cert_nickname . '.db';
+
+	my $sslconf =
+	    "ssl_ca_file='$cafile.crt'\n"
+	  . "ssl_cert_file='ssl/$certfile.crt'\n"
+	  . "ssl_crl_file=''\n"
+	  . "ssl_database='nss/$cert_database'\n";
+
+	return $sslconf;
+}
+
+sub cleanup
+{
+	# Something?
+}
+
+1;
diff --git a/src/test/ssl/t/SSL/Backend/OpenSSL.pm b/src/test/ssl/t/SSL/Backend/OpenSSL.pm
new file mode 100644
index 0000000000..62b11b7632
--- /dev/null
+++ b/src/test/ssl/t/SSL/Backend/OpenSSL.pm
@@ -0,0 +1,103 @@
+package SSL::Backend::OpenSSL;
+
+use strict;
+use warnings;
+use Exporter;
+use File::Copy;
+
+our @ISA       = qw(Exporter);
+our @EXPORT_OK = qw(get_new_openssl_backend);
+
+our (@keys);
+
+INIT
+{
+	@keys = (
+		"client",     "client-revoked",
+		"client-der", "client-encrypted-pem",
+		"client-encrypted-der");
+}
+
+sub new
+{
+	my ($class) = @_;
+
+	my $self = { _library => 'OpenSSL' };
+
+	bless $self, $class;
+
+	return $self;
+}
+
+sub get_new_openssl_backend
+{
+	my $class = 'SSL::Backend::OpenSSL';
+
+	my $backend = $class->new();
+
+	return $backend;
+}
+
+sub init
+{
+	# The client's private key must not be world-readable, so take a copy
+	# of the key stored in the code tree and update its permissions.
+	#
+	# This changes ssl/client.key to ssl/client_tmp.key etc for the rest
+	# of the tests.
+	foreach my $key (@keys)
+	{
+		copy("ssl/${key}.key", "ssl/${key}_tmp.key")
+		  or die
+		  "couldn't copy ssl/${key}.key to ssl/${key}_tmp.key for permissions change: $!";
+		chmod 0600, "ssl/${key}_tmp.key"
+		  or die "failed to change permissions on ssl/${key}_tmp.key: $!";
+	}
+
+	# Also make a copy of that explicitly world-readable.  We can't
+	# necessarily rely on the file in the source tree having those
+	# permissions. Add it to @keys to include it in the final clean
+	# up phase.
+	copy("ssl/client.key", "ssl/client_wrongperms_tmp.key")
+	  or die
+	  "couldn't copy ssl/client.key to ssl/client_wrongperms_tmp.key: $!";
+	chmod 0644, "ssl/client_wrongperms_tmp.key"
+	  or die
+	  "failed to change permissions on ssl/client_wrongperms_tmp.key: $!";
+	push @keys, 'client_wrongperms';
+}
+
+# Change the configuration to use given server cert file, and reload
+# the server so that the configuration takes effect.
+sub set_server_cert
+{
+	my $self     = $_[0];
+	my $certfile = $_[1];
+	my $cafile   = $_[2] || "root+client_ca";
+	my $keyfile  = $_[3] || $certfile;
+
+	my $sslconf =
+	    "ssl_ca_file='$cafile.crt'\n"
+	  . "ssl_cert_file='$certfile.crt'\n"
+	  . "ssl_key_file='$keyfile.key'\n"
+	  . "ssl_crl_file='root+client.crl'\n";
+
+	return $sslconf;
+}
+
+sub get_library
+{
+	my ($self) = @_;
+
+	return $self->{_library};
+}
+
+sub cleanup
+{
+	foreach my $key (@keys)
+	{
+		unlink("ssl/${key}_tmp.key");
+	}
+}
+
+1;
diff --git a/src/test/ssl/t/SSLServer.pm b/src/test/ssl/t/SSL/Server.pm
similarity index 78%
rename from src/test/ssl/t/SSLServer.pm
rename to src/test/ssl/t/SSL/Server.pm
index 1e392b8fbf..679969902e 100644
--- a/src/test/ssl/t/SSLServer.pm
+++ b/src/test/ssl/t/SSL/Server.pm
@@ -24,19 +24,39 @@
 # explicitly because an invalid sslcert or sslrootcert, respectively,
 # causes those to be ignored.)
 
-package SSLServer;
+package SSL::Server;
 
 use strict;
 use warnings;
 use PostgresNode;
+use RecursiveCopy;
 use TestLib;
 use File::Basename;
 use File::Copy;
 use Test::More;
+use SSL::Backend::OpenSSL qw(get_new_openssl_backend);
+use SSL::Backend::NSS qw(get_new_nss_backend);
+
+our ($openssl, $nss, $backend);
+
+# The TLS backend which the server is using should be mostly transparent for
+# the user, apart from individual configuration settings, so keep the backend
+# specific things abstracted behind SSL::Server.
+if ($ENV{with_openssl} eq 'yes')
+{
+	$backend = get_new_openssl_backend();
+	$openssl = 1;
+}
+elsif ($ENV{with_nss} eq 'yes')
+{
+	$backend = get_new_nss_backend();
+	$nss     = 1;
+}
 
 use Exporter 'import';
 our @EXPORT = qw(
   configure_test_server_for_ssl
+  set_server_cert
   switch_server_cert
   test_connect_fails
   test_connect_ok
@@ -145,12 +165,19 @@ sub configure_test_server_for_ssl
 	close $sslconf;
 
 	# Copy all server certificates and keys, and client root cert, to the data dir
-	copy_files("ssl/server-*.crt", $pgdata);
-	copy_files("ssl/server-*.key", $pgdata);
-	chmod(0600, glob "$pgdata/server-*.key") or die $!;
-	copy_files("ssl/root+client_ca.crt", $pgdata);
-	copy_files("ssl/root_ca.crt",        $pgdata);
-	copy_files("ssl/root+client.crl",    $pgdata);
+	if (defined($openssl))
+	{
+		copy_files("ssl/server-*.crt", $pgdata);
+		copy_files("ssl/server-*.key", $pgdata);
+		chmod(0600, glob "$pgdata/server-*.key") or die $!;
+		copy_files("ssl/root+client_ca.crt", $pgdata);
+		copy_files("ssl/root_ca.crt",        $pgdata);
+		copy_files("ssl/root+client.crl",    $pgdata);
+	}
+	elsif (defined($nss))
+	{
+		RecursiveCopy::copypath("ssl/nss", $pgdata . "/nss") if -e "ssl/nss";
+	}
 
 	# Stop and restart server to load new listen_addresses.
 	$node->restart;
@@ -158,26 +185,51 @@ sub configure_test_server_for_ssl
 	# Change pg_hba after restart because hostssl requires ssl=on
 	configure_hba_for_ssl($node, $servercidr, $authmethod);
 
+	# Finally, perform backend specific configuration
+	$backend->init();
+
 	return;
 }
 
-# Change the configuration to use given server cert file, and reload
-# the server so that the configuration takes effect.
-sub switch_server_cert
+sub ssl_library
+{
+	return $backend->get_library();
+}
+
+sub cleanup
+{
+	$backend->cleanup();
+}
+
+# Change the configuration to use given server cert file,
+sub set_server_cert
 {
 	my $node     = $_[0];
 	my $certfile = $_[1];
 	my $cafile   = $_[2] || "root+client_ca";
+	my $keyfile  = $_[3] || '';
+	my $pwcmd    = $_[4] || '';
 	my $pgdata   = $node->data_dir;
 
+	$keyfile = $certfile if $keyfile eq '';
+
 	open my $sslconf, '>', "$pgdata/sslconfig.conf";
 	print $sslconf "ssl=on\n";
-	print $sslconf "ssl_ca_file='$cafile.crt'\n";
-	print $sslconf "ssl_cert_file='$certfile.crt'\n";
-	print $sslconf "ssl_key_file='$certfile.key'\n";
-	print $sslconf "ssl_crl_file='root+client.crl'\n";
+	print $sslconf $backend->set_server_cert($certfile, $cafile, $keyfile);
+	print $sslconf "ssl_passphrase_command='$pwcmd'\n"
+	  unless $pwcmd eq '';
 	close $sslconf;
+	return;
+}
 
+# Change the configuration to use given server cert file, and reload
+# the server so that the configuration takes effect.
+# Takes the same arguments as set_server_cert, which it calls to do that
+# piece of the work.
+sub switch_server_cert
+{
+	my $node = $_[0];
+	set_server_cert(@_);
 	$node->restart;
 	return;
 }
diff --git a/src/tools/msvc/Install.pm b/src/tools/msvc/Install.pm
index b6d0cfd39b..c53c59229e 100644
--- a/src/tools/msvc/Install.pm
+++ b/src/tools/msvc/Install.pm
@@ -438,7 +438,8 @@ sub CopyContribFiles
 		{
 			# These configuration-based exclusions must match vcregress.pl
 			next if ($d eq "uuid-ossp"  && !defined($config->{uuid}));
-			next if ($d eq "sslinfo"    && !defined($config->{openssl}));
+			next if ($d eq "sslinfo"    && !defined($config->{openssl})
+			  && !defined($config->{nss}));
 			next if ($d eq "xml2"       && !defined($config->{xml}));
 			next if ($d =~ /_plperl$/   && !defined($config->{perl}));
 			next if ($d =~ /_plpython$/ && !defined($config->{python}));
diff --git a/src/tools/msvc/Mkvcbuild.pm b/src/tools/msvc/Mkvcbuild.pm
index 20da7985c1..818a1922f3 100644
--- a/src/tools/msvc/Mkvcbuild.pm
+++ b/src/tools/msvc/Mkvcbuild.pm
@@ -192,12 +192,19 @@ sub mkvcbuild
 	$postgres->FullExportDLL('postgres.lib');
 
 	# The OBJS scraper doesn't know about ifdefs, so remove appropriate files
-	# if building without OpenSSL.
-	if (!$solution->{options}->{openssl})
+	# if building without various options.
+	if (!$solution->{options}->{openssl} && !$solution->{options}->{nss})
 	{
 		$postgres->RemoveFile('src/backend/libpq/be-secure-common.c');
+	}
+	if (!$solution->{options}->{openssl})
+	{
 		$postgres->RemoveFile('src/backend/libpq/be-secure-openssl.c');
 	}
+	if (!$solution->{options}->{nss})
+	{
+		$postgres->RemoveFile('src/backend/libpq/be-secure-nss.c');
+	}
 	if (!$solution->{options}->{gss})
 	{
 		$postgres->RemoveFile('src/backend/libpq/be-gssapi-common.c');
@@ -255,12 +262,19 @@ sub mkvcbuild
 	$libpq->AddReference($libpgcommon, $libpgport);
 
 	# The OBJS scraper doesn't know about ifdefs, so remove appropriate files
-	# if building without OpenSSL.
-	if (!$solution->{options}->{openssl})
+	# if building without various options
+	if (!$solution->{options}->{openssl} && !$solution->{options}->{nss})
 	{
 		$libpq->RemoveFile('src/interfaces/libpq/fe-secure-common.c');
+	}
+	if (!$solution->{options}->{openssl})
+	{
 		$libpq->RemoveFile('src/interfaces/libpq/fe-secure-openssl.c');
 	}
+	if (!$solution->{options}->{nss})
+	{
+		$libpq->RemoveFile('src/interfaces/libpq/fe-secure-nss.c');
+	}
 	if (!$solution->{options}->{gss})
 	{
 		$libpq->RemoveFile('src/interfaces/libpq/fe-gssapi-common.c');
@@ -428,9 +442,14 @@ sub mkvcbuild
 		push @contrib_excludes, 'xml2';
 	}
 
+	if (!$solution->{options}->{openssl} && !$solution->{options}->{nss})
+	{
+		push @contrib_excludes, 'sslinfo';
+	}
+
 	if (!$solution->{options}->{openssl})
 	{
-		push @contrib_excludes, 'sslinfo', 'ssl_passphrase_callback';
+		push @contrib_excludes, 'ssl_passphrase_callback';
 	}
 
 	if (!$solution->{options}->{uuid})
diff --git a/src/tools/msvc/Solution.pm b/src/tools/msvc/Solution.pm
index bc8904732f..ac11d9ab26 100644
--- a/src/tools/msvc/Solution.pm
+++ b/src/tools/msvc/Solution.pm
@@ -484,6 +484,7 @@ sub GenerateFiles
 		USE_NAMED_POSIX_SEMAPHORES => undef,
 		USE_OPENSSL                => undef,
 		USE_OPENSSL_RANDOM         => undef,
+		USE_NSS                    => undef,
 		USE_PAM                    => undef,
 		USE_SLICING_BY_8_CRC32C    => undef,
 		USE_SSE42_CRC32C           => undef,
@@ -537,6 +538,10 @@ sub GenerateFiles
 			$define{HAVE_OPENSSL_INIT_SSL}      = 1;
 		}
 	}
+	if ($self->{options}->{nss})
+	{
+		$define{USE_NSS} = 1;
+	}
 
 	$self->GenerateConfigHeader('src/include/pg_config.h',     \%define, 1);
 	$self->GenerateConfigHeader('src/include/pg_config_ext.h', \%define, 0);
@@ -1004,6 +1009,21 @@ sub AddProject
 			}
 		}
 	}
+	if ($self->{options}->{nss})
+	{
+		$proj->AddIncludeDir($self->{options}->{nss} . '\..\public\nss');
+		$proj->AddIncludeDir($self->{options}->{nss} . '\include\nspr');
+		foreach my $lib (qw(plds4 plc4 nspr4))
+		{
+			$proj->AddLibrary($self->{options}->{nss} .
+							  '\lib\lib' . "$lib.lib", 0);
+		}
+		foreach my $lib (qw(ssl3 smime3 nss3))
+		{
+			$proj->AddLibrary($self->{options}->{nss} .
+							  '\lib' . "\\$lib.dll.lib", 0);
+		}
+	}
 	if ($self->{options}->{nls})
 	{
 		$proj->AddIncludeDir($self->{options}->{nls} . '\include');
diff --git a/src/tools/msvc/config_default.pl b/src/tools/msvc/config_default.pl
index 2ef2cfc4e9..49dc4d5864 100644
--- a/src/tools/msvc/config_default.pl
+++ b/src/tools/msvc/config_default.pl
@@ -17,6 +17,7 @@ our $config = {
 	perl      => undef,    # --with-perl=<path>
 	python    => undef,    # --with-python=<path>
 	openssl   => undef,    # --with-openssl=<path>
+	nss       => undef,    # --with-nss=<path>
 	uuid      => undef,    # --with-uuid=<path>
 	xml       => undef,    # --with-libxml=<path>
 	xslt      => undef,    # --with-libxslt=<path>
-- 
2.25.4

From eadce6d33f6406798494a35f4997f49ace5e4cbb Mon Sep 17 00:00:00 2001
From: Andrew Dunstan <andrew@dunslane.net>
Date: Mon, 3 Aug 2020 12:32:10 -0400
Subject: [PATCH] WIP Support libnss for as TLS backend v8

---
 configure                                     |  211 ++++
 configure.ac                                  |   30 +
 contrib/Makefile                              |    2 +-
 .../postgres_fdw/expected/postgres_fdw.out    |    2 +-
 contrib/sslinfo/sslinfo.c                     |  164 ++-
 doc/src/sgml/sslinfo.sgml                     |   14 +-
 src/Makefile.global.in                        |   10 +
 src/backend/libpq/Makefile                    |    4 +
 src/backend/libpq/auth.c                      |    7 +
 src/backend/libpq/be-secure-nss.c             | 1032 +++++++++++++++++
 src/backend/libpq/be-secure-openssl.c         |   16 +-
 src/backend/libpq/be-secure.c                 |    3 +
 src/backend/utils/misc/guc.c                  |   20 +-
 src/include/common/pg_nss.h                   |  141 +++
 src/include/libpq/libpq-be.h                  |    9 +-
 src/include/libpq/libpq.h                     |    3 +
 src/include/pg_config.h.in                    |    3 +
 src/include/pg_config_manual.h                |    5 +-
 src/interfaces/libpq/Makefile                 |    4 +
 src/interfaces/libpq/fe-connect.c             |    4 +
 src/interfaces/libpq/fe-secure-nss.c          |  975 ++++++++++++++++
 src/interfaces/libpq/fe-secure.c              |    5 +-
 src/interfaces/libpq/libpq-fe.h               |   11 +
 src/interfaces/libpq/libpq-int.h              |    5 +
 src/test/Makefile                             |    2 +-
 src/test/ssl/Makefile                         |  172 +++
 .../cert9.db                                  |  Bin 0 -> 36864 bytes
 .../key4.db                                   |  Bin 0 -> 45056 bytes
 .../pkcs11.txt                                |    5 +
 src/test/ssl/ssl/nss/client-encrypted-pem.pfx |  Bin 0 -> 3149 bytes
 .../cert9.db                                  |  Bin 0 -> 28672 bytes
 .../key4.db                                   |  Bin 0 -> 45056 bytes
 .../pkcs11.txt                                |    5 +
 src/test/ssl/ssl/nss/client-revoked.pfx       |  Bin 0 -> 3149 bytes
 src/test/ssl/ssl/nss/client.crl               |  Bin 0 -> 418 bytes
 ...ient.crt__client-encrypted-pem.key.db.pass |    1 +
 .../cert9.db                                  |  Bin 0 -> 36864 bytes
 .../key4.db                                   |  Bin 0 -> 45056 bytes
 .../pkcs11.txt                                |    5 +
 .../nss/client.crt__client.key.db/cert9.db    |  Bin 0 -> 36864 bytes
 .../ssl/nss/client.crt__client.key.db/key4.db |  Bin 0 -> 45056 bytes
 .../nss/client.crt__client.key.db/pkcs11.txt  |    5 +
 src/test/ssl/ssl/nss/client.pfx               |  Bin 0 -> 3149 bytes
 .../ssl/ssl/nss/client_ca.crt.db/cert9.db     |  Bin 0 -> 28672 bytes
 src/test/ssl/ssl/nss/client_ca.crt.db/key4.db |  Bin 0 -> 36864 bytes
 .../ssl/ssl/nss/client_ca.crt.db/pkcs11.txt   |    5 +
 src/test/ssl/ssl/nss/root+client.crl          |  Bin 0 -> 393 bytes
 .../ssl/nss/root+client_ca.crt.db/cert9.db    |  Bin 0 -> 28672 bytes
 .../ssl/ssl/nss/root+client_ca.crt.db/key4.db |  Bin 0 -> 36864 bytes
 .../ssl/nss/root+client_ca.crt.db/pkcs11.txt  |    5 +
 .../ssl/nss/root+server_ca.crt.db/cert9.db    |  Bin 0 -> 28672 bytes
 .../ssl/ssl/nss/root+server_ca.crt.db/key4.db |  Bin 0 -> 36864 bytes
 .../ssl/nss/root+server_ca.crt.db/pkcs11.txt  |    5 +
 .../cert9.db                                  |  Bin 0 -> 28672 bytes
 .../key4.db                                   |  Bin 0 -> 36864 bytes
 .../pkcs11.txt                                |    5 +
 .../cert9.db                                  |  Bin 0 -> 28672 bytes
 .../root+server_ca.crt__server.crl.db/key4.db |  Bin 0 -> 36864 bytes
 .../pkcs11.txt                                |    5 +
 src/test/ssl/ssl/nss/root.crl                 |  Bin 0 -> 393 bytes
 .../cert9.db                                  |  Bin 0 -> 36864 bytes
 .../key4.db                                   |  Bin 0 -> 45056 bytes
 .../pkcs11.txt                                |    5 +
 .../ssl/ssl/nss/server-cn-and-alt-names.pfx   |  Bin 0 -> 3349 bytes
 .../cert9.db                                  |  Bin 0 -> 28672 bytes
 .../key4.db                                   |  Bin 0 -> 45056 bytes
 .../pkcs11.txt                                |    5 +
 .../cert9.db                                  |  Bin 0 -> 36864 bytes
 .../key4.db                                   |  Bin 0 -> 45056 bytes
 .../pkcs11.txt                                |    5 +
 src/test/ssl/ssl/nss/server-cn-only.pfx       |  Bin 0 -> 3197 bytes
 .../cert9.db                                  |  Bin 0 -> 36864 bytes
 .../key4.db                                   |  Bin 0 -> 45056 bytes
 .../pkcs11.txt                                |    5 +
 .../ssl/ssl/nss/server-multiple-alt-names.pfx |  Bin 0 -> 3325 bytes
 .../cert9.db                                  |  Bin 0 -> 36864 bytes
 .../key4.db                                   |  Bin 0 -> 45056 bytes
 .../pkcs11.txt                                |    5 +
 src/test/ssl/ssl/nss/server-no-names.pfx      |  Bin 0 -> 3109 bytes
 src/test/ssl/ssl/nss/server-password.pfx      |  Bin 0 -> 3197 bytes
 .../cert9.db                                  |  Bin 0 -> 36864 bytes
 .../key4.db                                   |  Bin 0 -> 45056 bytes
 .../pkcs11.txt                                |    5 +
 src/test/ssl/ssl/nss/server-revoked.pfx       |  Bin 0 -> 3181 bytes
 .../cert9.db                                  |  Bin 0 -> 36864 bytes
 .../key4.db                                   |  Bin 0 -> 45056 bytes
 .../pkcs11.txt                                |    5 +
 .../ssl/ssl/nss/server-single-alt-name.pfx    |  Bin 0 -> 3213 bytes
 src/test/ssl/ssl/nss/server.crl               |  Bin 0 -> 418 bytes
 .../ssl/ssl/nss/server_ca.crt.db/cert9.db     |  Bin 0 -> 28672 bytes
 src/test/ssl/ssl/nss/server_ca.crt.db/key4.db |  Bin 0 -> 36864 bytes
 .../ssl/ssl/nss/server_ca.crt.db/pkcs11.txt   |    5 +
 src/test/ssl/t/001_ssltests.pl                |  289 ++---
 src/test/ssl/t/002_scram.pl                   |    4 +-
 src/test/ssl/t/SSL/Backend/NSS.pm             |   64 +
 src/test/ssl/t/SSL/Backend/OpenSSL.pm         |  103 ++
 .../ssl/t/{SSLServer.pm => SSL/Server.pm}     |   80 +-
 src/tools/msvc/Install.pm                     |    3 +-
 src/tools/msvc/Mkvcbuild.pm                   |   29 +-
 src/tools/msvc/Solution.pm                    |   20 +
 src/tools/msvc/config_default.pl              |    1 +
 101 files changed, 3276 insertions(+), 257 deletions(-)
 create mode 100644 src/backend/libpq/be-secure-nss.c
 create mode 100644 src/include/common/pg_nss.h
 create mode 100644 src/interfaces/libpq/fe-secure-nss.c
 create mode 100644 src/test/ssl/ssl/nss/client+client_ca.crt__client.key.db/cert9.db
 create mode 100644 src/test/ssl/ssl/nss/client+client_ca.crt__client.key.db/key4.db
 create mode 100644 src/test/ssl/ssl/nss/client+client_ca.crt__client.key.db/pkcs11.txt
 create mode 100644 src/test/ssl/ssl/nss/client-encrypted-pem.pfx
 create mode 100644 src/test/ssl/ssl/nss/client-revoked.crt__client-revoked.key.db/cert9.db
 create mode 100644 src/test/ssl/ssl/nss/client-revoked.crt__client-revoked.key.db/key4.db
 create mode 100644 src/test/ssl/ssl/nss/client-revoked.crt__client-revoked.key.db/pkcs11.txt
 create mode 100644 src/test/ssl/ssl/nss/client-revoked.pfx
 create mode 100644 src/test/ssl/ssl/nss/client.crl
 create mode 100644 src/test/ssl/ssl/nss/client.crt__client-encrypted-pem.key.db.pass
 create mode 100644 src/test/ssl/ssl/nss/client.crt__client-encrypted-pem.key.db/cert9.db
 create mode 100644 src/test/ssl/ssl/nss/client.crt__client-encrypted-pem.key.db/key4.db
 create mode 100644 src/test/ssl/ssl/nss/client.crt__client-encrypted-pem.key.db/pkcs11.txt
 create mode 100644 src/test/ssl/ssl/nss/client.crt__client.key.db/cert9.db
 create mode 100644 src/test/ssl/ssl/nss/client.crt__client.key.db/key4.db
 create mode 100644 src/test/ssl/ssl/nss/client.crt__client.key.db/pkcs11.txt
 create mode 100644 src/test/ssl/ssl/nss/client.pfx
 create mode 100644 src/test/ssl/ssl/nss/client_ca.crt.db/cert9.db
 create mode 100644 src/test/ssl/ssl/nss/client_ca.crt.db/key4.db
 create mode 100644 src/test/ssl/ssl/nss/client_ca.crt.db/pkcs11.txt
 create mode 100644 src/test/ssl/ssl/nss/root+client.crl
 create mode 100644 src/test/ssl/ssl/nss/root+client_ca.crt.db/cert9.db
 create mode 100644 src/test/ssl/ssl/nss/root+client_ca.crt.db/key4.db
 create mode 100644 src/test/ssl/ssl/nss/root+client_ca.crt.db/pkcs11.txt
 create mode 100644 src/test/ssl/ssl/nss/root+server_ca.crt.db/cert9.db
 create mode 100644 src/test/ssl/ssl/nss/root+server_ca.crt.db/key4.db
 create mode 100644 src/test/ssl/ssl/nss/root+server_ca.crt.db/pkcs11.txt
 create mode 100644 src/test/ssl/ssl/nss/root+server_ca.crt__root+server.crl.db/cert9.db
 create mode 100644 src/test/ssl/ssl/nss/root+server_ca.crt__root+server.crl.db/key4.db
 create mode 100644 src/test/ssl/ssl/nss/root+server_ca.crt__root+server.crl.db/pkcs11.txt
 create mode 100644 src/test/ssl/ssl/nss/root+server_ca.crt__server.crl.db/cert9.db
 create mode 100644 src/test/ssl/ssl/nss/root+server_ca.crt__server.crl.db/key4.db
 create mode 100644 src/test/ssl/ssl/nss/root+server_ca.crt__server.crl.db/pkcs11.txt
 create mode 100644 src/test/ssl/ssl/nss/root.crl
 create mode 100644 src/test/ssl/ssl/nss/server-cn-and-alt-names.crt__server-cn-and-alt-names.key.db/cert9.db
 create mode 100644 src/test/ssl/ssl/nss/server-cn-and-alt-names.crt__server-cn-and-alt-names.key.db/key4.db
 create mode 100644 src/test/ssl/ssl/nss/server-cn-and-alt-names.crt__server-cn-and-alt-names.key.db/pkcs11.txt
 create mode 100644 src/test/ssl/ssl/nss/server-cn-and-alt-names.pfx
 create mode 100644 src/test/ssl/ssl/nss/server-cn-only.crt__server-cn-only.key.db/cert9.db
 create mode 100644 src/test/ssl/ssl/nss/server-cn-only.crt__server-cn-only.key.db/key4.db
 create mode 100644 src/test/ssl/ssl/nss/server-cn-only.crt__server-cn-only.key.db/pkcs11.txt
 create mode 100644 src/test/ssl/ssl/nss/server-cn-only.crt__server-password.key.db/cert9.db
 create mode 100644 src/test/ssl/ssl/nss/server-cn-only.crt__server-password.key.db/key4.db
 create mode 100644 src/test/ssl/ssl/nss/server-cn-only.crt__server-password.key.db/pkcs11.txt
 create mode 100644 src/test/ssl/ssl/nss/server-cn-only.pfx
 create mode 100644 src/test/ssl/ssl/nss/server-multiple-alt-names.crt__server-multiple-alt-names.key.db/cert9.db
 create mode 100644 src/test/ssl/ssl/nss/server-multiple-alt-names.crt__server-multiple-alt-names.key.db/key4.db
 create mode 100644 src/test/ssl/ssl/nss/server-multiple-alt-names.crt__server-multiple-alt-names.key.db/pkcs11.txt
 create mode 100644 src/test/ssl/ssl/nss/server-multiple-alt-names.pfx
 create mode 100644 src/test/ssl/ssl/nss/server-no-names.crt__server-no-names.key.db/cert9.db
 create mode 100644 src/test/ssl/ssl/nss/server-no-names.crt__server-no-names.key.db/key4.db
 create mode 100644 src/test/ssl/ssl/nss/server-no-names.crt__server-no-names.key.db/pkcs11.txt
 create mode 100644 src/test/ssl/ssl/nss/server-no-names.pfx
 create mode 100644 src/test/ssl/ssl/nss/server-password.pfx
 create mode 100644 src/test/ssl/ssl/nss/server-revoked.crt__server-revoked.key.db/cert9.db
 create mode 100644 src/test/ssl/ssl/nss/server-revoked.crt__server-revoked.key.db/key4.db
 create mode 100644 src/test/ssl/ssl/nss/server-revoked.crt__server-revoked.key.db/pkcs11.txt
 create mode 100644 src/test/ssl/ssl/nss/server-revoked.pfx
 create mode 100644 src/test/ssl/ssl/nss/server-single-alt-name.crt__server-single-alt-name.key.db/cert9.db
 create mode 100644 src/test/ssl/ssl/nss/server-single-alt-name.crt__server-single-alt-name.key.db/key4.db
 create mode 100644 src/test/ssl/ssl/nss/server-single-alt-name.crt__server-single-alt-name.key.db/pkcs11.txt
 create mode 100644 src/test/ssl/ssl/nss/server-single-alt-name.pfx
 create mode 100644 src/test/ssl/ssl/nss/server.crl
 create mode 100644 src/test/ssl/ssl/nss/server_ca.crt.db/cert9.db
 create mode 100644 src/test/ssl/ssl/nss/server_ca.crt.db/key4.db
 create mode 100644 src/test/ssl/ssl/nss/server_ca.crt.db/pkcs11.txt
 create mode 100644 src/test/ssl/t/SSL/Backend/NSS.pm
 create mode 100644 src/test/ssl/t/SSL/Backend/OpenSSL.pm
 rename src/test/ssl/t/{SSLServer.pm => SSL/Server.pm} (78%)

diff --git a/configure b/configure
index cb8fbe1051..8b7d98c2ab 100755
--- a/configure
+++ b/configure
@@ -711,6 +711,7 @@ with_uuid
 with_readline
 with_systemd
 with_selinux
+with_nss
 with_openssl
 with_ldap
 with_krb_srvnam
@@ -856,6 +857,7 @@ with_bsd_auth
 with_ldap
 with_bonjour
 with_openssl
+with_nss
 with_selinux
 with_systemd
 with_readline
@@ -1558,6 +1560,7 @@ Optional Packages:
   --with-ldap             build with LDAP support
   --with-bonjour          build with Bonjour support
   --with-openssl          build with OpenSSL support
+  --with-nss              build with NSS support
   --with-selinux          build with SELinux support
   --with-systemd          build with systemd support
   --without-readline      do not use GNU Readline nor BSD Libedit for editing
@@ -8100,6 +8103,41 @@ fi
 $as_echo "$with_openssl" >&6; }
 
 
+#
+# LibNSS
+#
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether to build with NSS support" >&5
+$as_echo_n "checking whether to build with NSS support... " >&6; }
+
+
+
+# Check whether --with-nss was given.
+if test "${with_nss+set}" = set; then :
+  withval=$with_nss;
+  case $withval in
+    yes)
+
+$as_echo "#define USE_NSS 1" >>confdefs.h
+
+      ;;
+    no)
+      :
+      ;;
+    *)
+      as_fn_error $? "no argument expected for --with-nss option" "$LINENO" 5
+      ;;
+  esac
+
+else
+  with_nss=no
+
+fi
+
+
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $with_nss" >&5
+$as_echo "$with_nss" >&6; }
+
+
 #
 # SELinux
 #
@@ -12174,6 +12212,9 @@ fi
 fi
 
 if test "$with_openssl" = yes ; then
+  if test x"$with_nss" = x"yes" ; then
+    as_fn_error $? "multiple SSL backends cannot be enabled simultaneously\"" "$LINENO" 5
+  fi
     # Minimum required OpenSSL version is 1.0.1
 
 $as_echo "#define OPENSSL_API_COMPAT 0x10001000L" >>confdefs.h
@@ -12436,6 +12477,157 @@ done
 
 fi
 
+if test "$with_nss" = yes ; then
+  if test x"$with_openssl" = x"yes" ; then
+    as_fn_error $? "multiple SSL backends cannot be enabled simultaneously\"" "$LINENO" 5
+  fi
+  CLEANLDFLAGS="$LDFLAGS"
+  # TODO: document this set of LDFLAGS
+  LDFLAGS="-lssl3 -lsmime3 -lnss3 -lplds4 -lplc4 -lnspr4 $LDFLAGS"
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for SSL_VersionRangeSet in -lnss3" >&5
+$as_echo_n "checking for SSL_VersionRangeSet in -lnss3... " >&6; }
+if ${ac_cv_lib_nss3_SSL_VersionRangeSet+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lnss3  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char SSL_VersionRangeSet ();
+int
+main ()
+{
+return SSL_VersionRangeSet ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_lib_nss3_SSL_VersionRangeSet=yes
+else
+  ac_cv_lib_nss3_SSL_VersionRangeSet=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_nss3_SSL_VersionRangeSet" >&5
+$as_echo "$ac_cv_lib_nss3_SSL_VersionRangeSet" >&6; }
+if test "x$ac_cv_lib_nss3_SSL_VersionRangeSet" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_LIBNSS3 1
+_ACEOF
+
+  LIBS="-lnss3 $LIBS"
+
+else
+  as_fn_error $? "library 'nss3' is required for NSS" "$LINENO" 5
+fi
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for PR_GetDefaultIOMethods in -lnspr4" >&5
+$as_echo_n "checking for PR_GetDefaultIOMethods in -lnspr4... " >&6; }
+if ${ac_cv_lib_nspr4_PR_GetDefaultIOMethods+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lnspr4  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char PR_GetDefaultIOMethods ();
+int
+main ()
+{
+return PR_GetDefaultIOMethods ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_lib_nspr4_PR_GetDefaultIOMethods=yes
+else
+  ac_cv_lib_nspr4_PR_GetDefaultIOMethods=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_nspr4_PR_GetDefaultIOMethods" >&5
+$as_echo "$ac_cv_lib_nspr4_PR_GetDefaultIOMethods" >&6; }
+if test "x$ac_cv_lib_nspr4_PR_GetDefaultIOMethods" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_LIBNSPR4 1
+_ACEOF
+
+  LIBS="-lnspr4 $LIBS"
+
+else
+  as_fn_error $? "library 'nspr4' is required for NSS" "$LINENO" 5
+fi
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for SSL_GetImplementedCiphers in -lssl3" >&5
+$as_echo_n "checking for SSL_GetImplementedCiphers in -lssl3... " >&6; }
+if ${ac_cv_lib_ssl3_SSL_GetImplementedCiphers+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lssl3  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char SSL_GetImplementedCiphers ();
+int
+main ()
+{
+return SSL_GetImplementedCiphers ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_lib_ssl3_SSL_GetImplementedCiphers=yes
+else
+  ac_cv_lib_ssl3_SSL_GetImplementedCiphers=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_ssl3_SSL_GetImplementedCiphers" >&5
+$as_echo "$ac_cv_lib_ssl3_SSL_GetImplementedCiphers" >&6; }
+if test "x$ac_cv_lib_ssl3_SSL_GetImplementedCiphers" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_LIBSSL3 1
+_ACEOF
+
+  LIBS="-lssl3 $LIBS"
+
+else
+  as_fn_error $? "library 'ssl3' is required for NSS" "$LINENO" 5
+fi
+
+  LDFLAGS="$CLEANLDFLAGS"
+fi
+
 if test "$with_pam" = yes ; then
   { $as_echo "$as_me:${as_lineno-$LINENO}: checking for pam_start in -lpam" >&5
 $as_echo_n "checking for pam_start in -lpam... " >&6; }
@@ -13338,6 +13530,25 @@ else
 fi
 
 
+fi
+
+if test "$with_nss" = yes ; then
+  ac_fn_c_check_header_mongrel "$LINENO" "ssl.h" "ac_cv_header_ssl_h" "$ac_includes_default"
+if test "x$ac_cv_header_ssl_h" = xyes; then :
+
+else
+  as_fn_error $? "header file <ssl.h> is required for NSS" "$LINENO" 5
+fi
+
+
+  ac_fn_c_check_header_mongrel "$LINENO" "nss.h" "ac_cv_header_nss_h" "$ac_includes_default"
+if test "x$ac_cv_header_nss_h" = xyes; then :
+
+else
+  as_fn_error $? "header file <nss.h> is required for NSS" "$LINENO" 5
+fi
+
+
 fi
 
 if test "$with_pam" = yes ; then
diff --git a/configure.ac b/configure.ac
index eb2c731b58..23c07cabce 100644
--- a/configure.ac
+++ b/configure.ac
@@ -856,6 +856,15 @@ PGAC_ARG_BOOL(with, openssl, no, [build with OpenSSL support],
 AC_MSG_RESULT([$with_openssl])
 AC_SUBST(with_openssl)
 
+#
+# LibNSS
+#
+AC_MSG_CHECKING([whether to build with NSS support])
+PGAC_ARG_BOOL(with, nss, no, [build with NSS support],
+              [AC_DEFINE([USE_NSS], 1, [Define to build with NSS support. (--with-nss)])])
+AC_MSG_RESULT([$with_nss])
+AC_SUBST(with_nss)
+
 #
 # SELinux
 #
@@ -1205,6 +1214,9 @@ if test "$with_gssapi" = yes ; then
 fi
 
 if test "$with_openssl" = yes ; then
+  if test x"$with_nss" = x"yes" ; then
+    AC_MSG_ERROR([multiple SSL backends cannot be enabled simultaneously"])
+  fi
   dnl Order matters!
   # Minimum required OpenSSL version is 1.0.1
   AC_DEFINE(OPENSSL_API_COMPAT, [0x10001000L],
@@ -1230,6 +1242,19 @@ if test "$with_openssl" = yes ; then
   AC_CHECK_FUNCS([CRYPTO_lock])
 fi
 
+if test "$with_nss" = yes ; then
+  if test x"$with_openssl" = x"yes" ; then
+    AC_MSG_ERROR([multiple SSL backends cannot be enabled simultaneously"])
+  fi
+  CLEANLDFLAGS="$LDFLAGS"
+  # TODO: document this set of LDFLAGS
+  LDFLAGS="-lssl3 -lsmime3 -lnss3 -lplds4 -lplc4 -lnspr4 $LDFLAGS"
+  AC_CHECK_LIB(nss3, SSL_VersionRangeSet, [], [AC_MSG_ERROR([library 'nss3' is required for NSS])])
+  AC_CHECK_LIB(nspr4, PR_GetDefaultIOMethods, [], [AC_MSG_ERROR([library 'nspr4' is required for NSS])])
+  AC_CHECK_LIB(ssl3, SSL_GetImplementedCiphers, [], [AC_MSG_ERROR([library 'ssl3' is required for NSS])])
+  LDFLAGS="$CLEANLDFLAGS"
+fi
+
 if test "$with_pam" = yes ; then
   AC_CHECK_LIB(pam,    pam_start, [], [AC_MSG_ERROR([library 'pam' is required for PAM])])
 fi
@@ -1405,6 +1430,11 @@ if test "$with_openssl" = yes ; then
   AC_CHECK_HEADER(openssl/err.h, [], [AC_MSG_ERROR([header file <openssl/err.h> is required for OpenSSL])])
 fi
 
+if test "$with_nss" = yes ; then
+  AC_CHECK_HEADER(ssl.h, [], [AC_MSG_ERROR([header file <ssl.h> is required for NSS])])
+  AC_CHECK_HEADER(nss.h, [], [AC_MSG_ERROR([header file <nss.h> is required for NSS])])
+fi
+
 if test "$with_pam" = yes ; then
   AC_CHECK_HEADERS(security/pam_appl.h, [],
                    [AC_CHECK_HEADERS(pam/pam_appl.h, [],
diff --git a/contrib/Makefile b/contrib/Makefile
index 1846d415b6..cef7bf7f61 100644
--- a/contrib/Makefile
+++ b/contrib/Makefile
@@ -50,7 +50,7 @@ SUBDIRS = \
 		unaccent	\
 		vacuumlo
 
-ifeq ($(with_openssl),yes)
+ifeq ($(with_ssl),yes)
 SUBDIRS += sslinfo
 else
 ALWAYS_SUBDIRS += sslinfo
diff --git a/contrib/postgres_fdw/expected/postgres_fdw.out b/contrib/postgres_fdw/expected/postgres_fdw.out
index 90db550b92..961cb56358 100644
--- a/contrib/postgres_fdw/expected/postgres_fdw.out
+++ b/contrib/postgres_fdw/expected/postgres_fdw.out
@@ -8898,7 +8898,7 @@ DO $d$
     END;
 $d$;
 ERROR:  invalid option "password"
-HINT:  Valid options in this context are: service, passfile, channel_binding, connect_timeout, dbname, host, hostaddr, port, options, application_name, keepalives, keepalives_idle, keepalives_interval, keepalives_count, tcp_user_timeout, sslmode, sslcompression, sslcert, sslkey, sslrootcert, sslcrl, requirepeer, ssl_min_protocol_version, ssl_max_protocol_version, gssencmode, krbsrvname, gsslib, target_session_attrs, use_remote_estimate, fdw_startup_cost, fdw_tuple_cost, extensions, updatable, fetch_size
+HINT:  Valid options in this context are: service, passfile, channel_binding, connect_timeout, dbname, host, hostaddr, port, options, application_name, keepalives, keepalives_idle, keepalives_interval, keepalives_count, tcp_user_timeout, sslmode, sslcompression, sslcert, sslkey, sslrootcert, sslcrl, requirepeer, ssl_min_protocol_version, ssl_max_protocol_version, gssencmode, krbsrvname, gsslib, target_session_attrs, cert_database, use_remote_estimate, fdw_startup_cost, fdw_tuple_cost, extensions, updatable, fetch_size
 CONTEXT:  SQL statement "ALTER SERVER loopback_nopw OPTIONS (ADD password 'dummypw')"
 PL/pgSQL function inline_code_block line 3 at EXECUTE
 -- If we add a password for our user mapping instead, we should get a different
diff --git a/contrib/sslinfo/sslinfo.c b/contrib/sslinfo/sslinfo.c
index 5ba3988e27..84bb2c65b8 100644
--- a/contrib/sslinfo/sslinfo.c
+++ b/contrib/sslinfo/sslinfo.c
@@ -9,9 +9,11 @@
 
 #include "postgres.h"
 
+#ifdef USE_OPENSSL
 #include <openssl/x509.h>
 #include <openssl/x509v3.h>
 #include <openssl/asn1.h>
+#endif
 
 #include "access/htup_details.h"
 #include "funcapi.h"
@@ -21,8 +23,8 @@
 
 PG_MODULE_MAGIC;
 
+#ifdef USE_OPENSSL
 static Datum X509_NAME_field_to_text(X509_NAME *name, text *fieldName);
-static Datum X509_NAME_to_text(X509_NAME *name);
 static Datum ASN1_STRING_to_text(ASN1_STRING *str);
 
 /*
@@ -32,6 +34,7 @@ typedef struct
 {
 	TupleDesc	tupdesc;
 } SSLExtensionInfoContext;
+#endif
 
 /*
  * Indicates whether current session uses SSL
@@ -54,9 +57,16 @@ PG_FUNCTION_INFO_V1(ssl_version);
 Datum
 ssl_version(PG_FUNCTION_ARGS)
 {
-	if (MyProcPort->ssl == NULL)
+	const char *version;
+
+	if (!MyProcPort->ssl_in_use)
+		PG_RETURN_NULL();
+
+	version = be_tls_get_version(MyProcPort);
+	if (version == NULL)
 		PG_RETURN_NULL();
-	PG_RETURN_TEXT_P(cstring_to_text(SSL_get_version(MyProcPort->ssl)));
+
+	PG_RETURN_TEXT_P(cstring_to_text(version));
 }
 
 
@@ -67,9 +77,16 @@ PG_FUNCTION_INFO_V1(ssl_cipher);
 Datum
 ssl_cipher(PG_FUNCTION_ARGS)
 {
-	if (MyProcPort->ssl == NULL)
+	const char *cipher;
+
+	if (!MyProcPort->ssl_in_use)
 		PG_RETURN_NULL();
-	PG_RETURN_TEXT_P(cstring_to_text(SSL_get_cipher(MyProcPort->ssl)));
+
+	cipher = be_tls_get_cipher(MyProcPort);
+	if (cipher == NULL)
+		PG_RETURN_NULL();
+
+	PG_RETURN_TEXT_P(cstring_to_text(cipher));
 }
 
 
@@ -83,7 +100,7 @@ PG_FUNCTION_INFO_V1(ssl_client_cert_present);
 Datum
 ssl_client_cert_present(PG_FUNCTION_ARGS)
 {
-	PG_RETURN_BOOL(MyProcPort->peer != NULL);
+	PG_RETURN_BOOL(MyProcPort->peer_cert_valid);
 }
 
 
@@ -99,29 +116,26 @@ PG_FUNCTION_INFO_V1(ssl_client_serial);
 Datum
 ssl_client_serial(PG_FUNCTION_ARGS)
 {
+	char decimal[NAMEDATALEN];
 	Datum		result;
-	Port	   *port = MyProcPort;
-	X509	   *peer = port->peer;
-	ASN1_INTEGER *serial = NULL;
-	BIGNUM	   *b;
-	char	   *decimal;
 
-	if (!peer)
+	if (!MyProcPort->ssl_in_use || !MyProcPort->peer_cert_valid)
+		PG_RETURN_NULL();
+
+	be_tls_get_peer_serial(MyProcPort, decimal, NAMEDATALEN);
+
+	if (!*decimal)
 		PG_RETURN_NULL();
-	serial = X509_get_serialNumber(peer);
-	b = ASN1_INTEGER_to_BN(serial, NULL);
-	decimal = BN_bn2dec(b);
 
-	BN_free(b);
 	result = DirectFunctionCall3(numeric_in,
 								 CStringGetDatum(decimal),
 								 ObjectIdGetDatum(0),
 								 Int32GetDatum(-1));
-	OPENSSL_free(decimal);
 	return result;
 }
 
 
+#ifdef USE_OPENSSL
 /*
  * Converts OpenSSL ASN1_STRING structure into text
  *
@@ -228,7 +242,7 @@ ssl_client_dn_field(PG_FUNCTION_ARGS)
 	text	   *fieldname = PG_GETARG_TEXT_PP(0);
 	Datum		result;
 
-	if (!(MyProcPort->peer))
+	if (!MyProcPort->ssl_in_use || !MyProcPort->peer_cert_valid)
 		PG_RETURN_NULL();
 
 	result = X509_NAME_field_to_text(X509_get_subject_name(MyProcPort->peer), fieldname);
@@ -273,76 +287,23 @@ ssl_issuer_field(PG_FUNCTION_ARGS)
 	else
 		return result;
 }
+#endif							/* USE_OPENSSL */
 
-
-/*
- * Equivalent of X509_NAME_oneline that respects encoding
- *
- * This function converts X509_NAME structure to the text variable
- * converting all textual data into current database encoding.
- *
- * Parameter: X509_NAME *name X509_NAME structure to be converted
- *
- * Returns: text datum which contains string representation of
- * X509_NAME
- */
-static Datum
-X509_NAME_to_text(X509_NAME *name)
+#ifdef USE_NSS
+PG_FUNCTION_INFO_V1(ssl_client_dn_field);
+Datum
+ssl_client_dn_field(PG_FUNCTION_ARGS)
 {
-	BIO		   *membuf = BIO_new(BIO_s_mem());
-	int			i,
-				nid,
-				count = X509_NAME_entry_count(name);
-	X509_NAME_ENTRY *e;
-	ASN1_STRING *v;
-	const char *field_name;
-	size_t		size;
-	char		nullterm;
-	char	   *sp;
-	char	   *dp;
-	text	   *result;
-
-	if (membuf == NULL)
-		ereport(ERROR,
-				(errcode(ERRCODE_OUT_OF_MEMORY),
-				 errmsg("could not create OpenSSL BIO structure")));
-
-	(void) BIO_set_close(membuf, BIO_CLOSE);
-	for (i = 0; i < count; i++)
-	{
-		e = X509_NAME_get_entry(name, i);
-		nid = OBJ_obj2nid(X509_NAME_ENTRY_get_object(e));
-		if (nid == NID_undef)
-			ereport(ERROR,
-					(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
-					 errmsg("could not get NID for ASN1_OBJECT object")));
-		v = X509_NAME_ENTRY_get_data(e);
-		field_name = OBJ_nid2sn(nid);
-		if (field_name == NULL)
-			field_name = OBJ_nid2ln(nid);
-		if (field_name == NULL)
-			ereport(ERROR,
-					(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
-					 errmsg("could not convert NID %d to an ASN1_OBJECT structure", nid)));
-		BIO_printf(membuf, "/%s=", field_name);
-		ASN1_STRING_print_ex(membuf, v,
-							 ((ASN1_STRFLGS_RFC2253 & ~ASN1_STRFLGS_ESC_MSB)
-							  | ASN1_STRFLGS_UTF8_CONVERT));
-	}
-
-	/* ensure null termination of the BIO's content */
-	nullterm = '\0';
-	BIO_write(membuf, &nullterm, 1);
-	size = BIO_get_mem_data(membuf, &sp);
-	dp = pg_any_to_server(sp, size - 1, PG_UTF8);
-	result = cstring_to_text(dp);
-	if (dp != sp)
-		pfree(dp);
-	if (BIO_free(membuf) != 1)
-		elog(ERROR, "could not free OpenSSL BIO structure");
+	PG_RETURN_NULL();
+}
 
-	PG_RETURN_TEXT_P(result);
+PG_FUNCTION_INFO_V1(ssl_issuer_field);
+Datum
+ssl_issuer_field(PG_FUNCTION_ARGS)
+{
+	PG_RETURN_NULL();
 }
+#endif							/* USE_NSS */
 
 
 /*
@@ -358,9 +319,17 @@ PG_FUNCTION_INFO_V1(ssl_client_dn);
 Datum
 ssl_client_dn(PG_FUNCTION_ARGS)
 {
-	if (!(MyProcPort->peer))
+	char		subject[NAMEDATALEN];
+
+	if (!MyProcPort->ssl_in_use || !MyProcPort->peer_cert_valid)
+		PG_RETURN_NULL();
+
+	be_tls_get_peer_subject_name(MyProcPort, subject, NAMEDATALEN);
+
+	if (!*subject)
 		PG_RETURN_NULL();
-	return X509_NAME_to_text(X509_get_subject_name(MyProcPort->peer));
+
+	PG_RETURN_TEXT_P(cstring_to_text(subject));
 }
 
 
@@ -377,12 +346,21 @@ PG_FUNCTION_INFO_V1(ssl_issuer_dn);
 Datum
 ssl_issuer_dn(PG_FUNCTION_ARGS)
 {
-	if (!(MyProcPort->peer))
+	char		issuer[NAMEDATALEN];
+
+	if (!MyProcPort->ssl_in_use || !MyProcPort->peer_cert_valid)
+		PG_RETURN_NULL();
+
+	be_tls_get_peer_issuer_name(MyProcPort, issuer, NAMEDATALEN);
+
+	if (!*issuer)
 		PG_RETURN_NULL();
-	return X509_NAME_to_text(X509_get_issuer_name(MyProcPort->peer));
+
+	PG_RETURN_TEXT_P(cstring_to_text(issuer));
 }
 
 
+#ifdef USE_OPENSSL
 /*
  * Returns information about available SSL extensions.
  *
@@ -516,3 +494,13 @@ ssl_extension_info(PG_FUNCTION_ARGS)
 	/* All done */
 	SRF_RETURN_DONE(funcctx);
 }
+#endif							/* USE_OPENSSL */
+
+#ifdef USE_NSS
+PG_FUNCTION_INFO_V1(ssl_extension_info);
+Datum
+ssl_extension_info(PG_FUNCTION_ARGS)
+{
+	PG_RETURN_NULL();
+}
+#endif							/* USE_NSS */
diff --git a/doc/src/sgml/sslinfo.sgml b/doc/src/sgml/sslinfo.sgml
index c237d4ba95..d15a206d2d 100644
--- a/doc/src/sgml/sslinfo.sgml
+++ b/doc/src/sgml/sslinfo.sgml
@@ -22,7 +22,8 @@
 
  <para>
   This extension won't build at all unless the installation was
-  configured with <literal>--with-openssl</literal>.
+  configured with SSL support, such as <literal>--with-openssl</literal>
+  or <literal>--with-nss</literal>.
  </para>
 
  <sect2>
@@ -54,7 +55,7 @@
     <listitem>
     <para>
      Returns the name of the protocol used for the SSL connection (e.g. TLSv1.0
-     TLSv1.1, or TLSv1.2).
+     TLSv1.1, TLSv1.2 or TLSv1.3).
     </para>
     </listitem>
    </varlistentry>
@@ -208,6 +209,9 @@ emailAddress
      the X.500 and X.509 standards, so you cannot just assign arbitrary
      meaning to them.
     </para>
+    <para>
+     This function is only available when using OpenSSL.
+    </para>
     </listitem>
    </varlistentry>
 
@@ -223,6 +227,9 @@ emailAddress
      Same as <function>ssl_client_dn_field</function>, but for the certificate issuer
      rather than the certificate subject.
     </para>
+    <para>
+     This function is only available when using OpenSSL.
+    </para>
     </listitem>
    </varlistentry>
 
@@ -238,6 +245,9 @@ emailAddress
      Provide information about extensions of client certificate: extension name,
      extension value, and if it is a critical extension.
     </para>
+    <para>
+     This function is only available when using OpenSSL.
+    </para>
     </listitem>
    </varlistentry>
   </variablelist>
diff --git a/src/Makefile.global.in b/src/Makefile.global.in
index 9a6265b3a0..2f25c51c6c 100644
--- a/src/Makefile.global.in
+++ b/src/Makefile.global.in
@@ -184,6 +184,7 @@ with_perl	= @with_perl@
 with_python	= @with_python@
 with_tcl	= @with_tcl@
 with_openssl	= @with_openssl@
+with_nss        = @with_nss@
 with_readline	= @with_readline@
 with_selinux	= @with_selinux@
 with_systemd	= @with_systemd@
@@ -232,6 +233,15 @@ CLANG = @CLANG@
 BITCODE_CFLAGS = @BITCODE_CFLAGS@
 BITCODE_CXXFLAGS = @BITCODE_CXXFLAGS@
 
+ifeq ($(with_openssl),yes)
+with_ssl = yes
+else ifeq ($(with_nss),yes)
+with_ssl = yes
+else
+with_ssl = no
+endif
+
+
 ##########################################################################
 #
 # Programs and flags
diff --git a/src/backend/libpq/Makefile b/src/backend/libpq/Makefile
index efc5ef760a..191266a426 100644
--- a/src/backend/libpq/Makefile
+++ b/src/backend/libpq/Makefile
@@ -30,6 +30,10 @@ OBJS = \
 
 ifeq ($(with_openssl),yes)
 OBJS += be-secure-openssl.o
+else
+ifeq ($(with_nss),yes)
+OBJS += be-secure-nss.o
+endif
 endif
 
 ifeq ($(with_gssapi),yes)
diff --git a/src/backend/libpq/auth.c b/src/backend/libpq/auth.c
index 02b6c3f127..8f4197d002 100644
--- a/src/backend/libpq/auth.c
+++ b/src/backend/libpq/auth.c
@@ -2870,7 +2870,14 @@ CheckCertAuth(Port *port)
 {
 	int			status_check_usermap = STATUS_ERROR;
 
+#if defined(USE_OPENSSL)
 	Assert(port->ssl);
+#elif defined(USE_NSS)
+	/* TODO: should we rename pr_fd to ssl, to keep consistency? */
+	Assert(port->pr_fd);
+#else
+	Assert(false);
+#endif
 
 	/* Make sure we have received a username in the certificate */
 	if (port->peer_cn == NULL ||
diff --git a/src/backend/libpq/be-secure-nss.c b/src/backend/libpq/be-secure-nss.c
new file mode 100644
index 0000000000..00ae054920
--- /dev/null
+++ b/src/backend/libpq/be-secure-nss.c
@@ -0,0 +1,1032 @@
+/*-------------------------------------------------------------------------
+ *
+ * be-secure-nss.c
+ *	  functions for supporting NSS as a TLS backend
+ *
+ *
+ * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ *	  src/backend/libpq/be-secure-nss.c
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#include "postgres.h"
+
+#include <sys/stat.h>
+
+/*
+ * BITS_PER_BYTE is also defined in the NSPR header fils, so we need to undef
+ * our version to avoid compiler warnings on redefinition.
+ */
+#define pg_BITS_PER_BYTE BITS_PER_BYTE
+#undef BITS_PER_BYTE
+
+/*
+ * The nspr/obsolete/protypes.h NSPR header typedefs uint64 and int64 with
+ * colliding definitions from ours, causing a much expected compiler error.
+ * The definitions are however not actually used in NSPR at all, and are only
+ * intended for what seems to be backwards compatibility for apps written
+ * against old versions of NSPR.  The following comment is in the referenced
+ * file, and was added in 1998:
+ *
+ *		This section typedefs the old 'native' types to the new PR<type>s.
+ *		These definitions are scheduled to be eliminated at the earliest
+ *		possible time. The NSPR API is implemented and documented using
+ *		the new definitions.
+ *
+ * As there is no opt-out from pulling in these typedefs, we define the guard
+ * for the file to exclude it. This is incredibly ugly, but seems to be about
+ * the only way around it.
+ */
+#define PROTYPES_H
+#include <nspr.h>
+#undef PROTYPES_H
+#include <nss.h>
+#include <prio.h>
+#include <ssl.h>
+#include <sslerr.h>
+#include <secerr.h>
+#include <sslproto.h>
+#include <prtypes.h>
+#include <pk11pub.h>
+#include <secitem.h>
+#include <secport.h>
+#include <secder.h>
+#include <certdb.h>
+#include <base64.h>
+#include <cert.h>
+#include <prerror.h>
+#include <keyhi.h>
+
+typedef struct
+{
+	enum
+	{
+		PW_NONE = 0,
+		PW_FROMFILE = 1,
+		PW_PLAINTEXT = 2,
+		PW_EXTERNAL = 3
+	} source;
+	char	   *data;
+}			secuPWData;
+
+/*
+ * Ensure that the colliding definitions match, else throw an error. In case
+ * NSPR has removed the definition for some reasone, make sure to put ours
+ * back again.
+ */
+#if defined(BITS_PER_BYTE)
+#if BITS_PER_BYTE != pg_BITS_PER_BYTE
+#error "incompatible byte widths between NSPR and postgres"
+#endif
+#else
+#define BITS_PER_BYTE pg_BITS_PER_BYTE
+#endif
+#undef pg_BITS_PER_BYTE
+
+#include "common/pg_nss.h"
+#include "lib/stringinfo.h"
+#include "libpq/libpq.h"
+#include "nodes/pg_list.h"
+#include "miscadmin.h"
+#include "storage/fd.h"
+#include "utils/guc.h"
+#include "utils/memutils.h"
+
+static PRDescIdentity pr_id;
+
+static PRIOMethods pr_iomethods;
+static NSSInitContext * nss_context = NULL;
+static SSLVersionRange desired_sslver;
+
+/*
+ * PR_ImportTCPSocket() is a private API, but very widely used, as it's the
+ * only way to make NSS use an already set up POSIX file descriptor rather
+ * than opening one itself. To quote the NSS documentation:
+ *
+ *		"In theory, code that uses PR_ImportTCPSocket may break when NSPR's
+ *		implementation changes. In practice, this is unlikely to happen because
+ *		NSPR's implementation has been stable for years and because of NSPR's
+ *		strong commitment to backward compatibility."
+ *
+ * https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSPR/Reference/PR_ImportTCPSocket
+ *
+ * The function is declared in <private/pprio.h>, but as it is a header marked
+ * private we declare it here rather than including it.
+ */
+NSPR_API(PRFileDesc *) PR_ImportTCPSocket(int);
+
+/* NSS IO layer callback overrides */
+static PRInt32 pg_ssl_read(PRFileDesc * fd, void *buf, PRInt32 amount,
+						   PRIntn flags, PRIntervalTime timeout);
+static PRInt32 pg_ssl_write(PRFileDesc * fd, const void *buf, PRInt32 amount,
+							PRIntn flags, PRIntervalTime timeout);
+/* Utility functions */
+static PRFileDesc * init_iolayer(Port *port, int loglevel);
+static uint16 ssl_protocol_version_to_nss(int v, const char *guc_name);
+
+static char *pg_SSLerrmessage(PRErrorCode errcode);
+static char *ssl_protocol_version_to_string(int v);
+static SECStatus pg_cert_auth_handler(void *arg, PRFileDesc * fd,
+									  PRBool checksig, PRBool isServer);
+static SECStatus pg_bad_cert_handler(void *arg, PRFileDesc * fd);
+
+/* ------------------------------------------------------------ */
+/*						 Public interface						*/
+/* ------------------------------------------------------------ */
+
+static char *
+ssl_passphrase_callback(PK11SlotInfo * slot, PRBool retry, void *arg)
+{
+	return pstrdup("");
+}
+
+/*
+ * be_tls_init
+ *			Initialize the nss TLS library in the postmaster
+ *
+ * The majority of the setup needs to happen in be_tls_open_server since the
+ * NSPR initialization must happen after the forking of the backend. We could
+ * potentially move some parts in under !isServerStart, but so far this is the
+ * separation chosen.
+ */
+int
+be_tls_init(bool isServerStart)
+{
+	SECStatus	status;
+	SSLVersionRange supported_sslver;
+
+	/*
+	 * Set up the connection cache for multi-processing application behavior.
+	 * If we are in ServerStart then we initialize the cache. If the server is
+	 * already started, we inherit the cache such that it can be used for
+	 * connections. Calling SSL_ConfigMPServerSIDCache sets an environment
+	 * variable which contains enough information for the forked child to know
+	 * how to access it.  Passing NULL to SSL_InheritMPServerSIDCache will
+	 * make the forked child look it up by the default name SSL_INHERITANCE,
+	 * if env vars aren't inherited then the contents of the variable can be
+	 * passed instead.
+	 */
+	if (isServerStart)
+	{
+		/*
+		 * SSLv2 and SSLv3 are disabled in this TLS backend, but when setting
+		 * up the required session cache for NSS we still must supply timeout
+		 * values for v2 and The minimum allowed value for both is 5 seconds,
+		 * so opt for that in both cases (the defaults being 100 seconds and
+		 * 24 hours).
+		 *
+		 * Passing NULL as the directory for the session cache will default to
+		 * using /tmp on UNIX and \\temp on Windows.  Deciding if we want to
+		 * keep closer control on this directory is left as a TODO.
+		 */
+		status = SSL_ConfigMPServerSIDCache(MaxConnections, 5, 5, NULL);
+		if (status != SECSuccess)
+			ereport(FATAL,
+					(errmsg("unable to set up TLS connection cache: %s",
+							pg_SSLerrmessage(PR_GetError()))));
+
+	}
+	else
+	{
+		status = SSL_InheritMPServerSIDCache(NULL);
+		if (status != SECSuccess)
+		{
+			ereport(LOG,
+					(errmsg("unable to connect to TLS connection cache: %s",
+							pg_SSLerrmessage(PR_GetError()))));
+			return -1;
+		}
+	}
+
+	if (!ssl_database || strlen(ssl_database) == 0)
+	{
+		ereport(isServerStart ? FATAL : LOG,
+				(errmsg("no certificate database specified")));
+		goto error;
+	}
+
+	/*
+	 * We check for the desired TLS version range here, even though we cannot
+	 * set it until be_open_server such that we can be compatible with how the
+	 * OpenSSL backend reports errors for incompatible range configurations.
+	 * Set either the default supported TLS version range, or the configured
+	 * range from ssl_min_protocol_version and ssl_max_protocol version. In
+	 * case the user hasn't defined the maximum allowed version we fall back
+	 * to the highest version TLS that the library supports.
+	 */
+	if (SSL_VersionRangeGetSupported(ssl_variant_stream, &supported_sslver) != SECSuccess)
+	{
+		ereport(isServerStart ? FATAL : LOG,
+				(errmsg("unable to get default protocol support from NSS")));
+		goto error;
+	}
+
+	/*
+	 * Set the fallback versions for the TLS protocol version range to a
+	 * combination of our minimal requirement and the library maximum.
+	 */
+	desired_sslver.min = SSL_LIBRARY_VERSION_TLS_1_0;
+	desired_sslver.max = supported_sslver.max;
+
+	if (ssl_min_protocol_version)
+	{
+		int			ver = ssl_protocol_version_to_nss(ssl_min_protocol_version,
+													  "ssl_min_protocol_version");
+
+		if (ver == -1)
+		{
+			ereport(isServerStart ? FATAL : LOG,
+					(errmsg("\"%s\" setting \"%s\" not supported by this build",
+							"ssl_min_protocol_version",
+							GetConfigOption("ssl_min_protocol_version",
+											false, false))));
+			goto error;
+		}
+
+		if (ver > 0)
+			desired_sslver.min = ver;
+	}
+
+	if (ssl_max_protocol_version)
+	{
+		int			ver = ssl_protocol_version_to_nss(ssl_max_protocol_version,
+													  "ssl_max_protocol_version");
+
+		if (ver == -1)
+		{
+			ereport(isServerStart ? FATAL : LOG,
+					(errmsg("\"%s\" setting \"%s\" not supported by this build",
+							"ssl_max_protocol_version",
+							GetConfigOption("ssl_max_protocol_version",
+											false, false))));
+			goto error;
+		}
+		if (ver > 0)
+			desired_sslver.max = ver;
+
+		if (ver < desired_sslver.min)
+		{
+			ereport(isServerStart ? FATAL : LOG,
+					(errmsg("could not set SSL protocol version range"),
+					 errdetail("\"%s\" cannot be higher than \"%s\"",
+							   "ssl_min_protocol_version",
+							   "ssl_max_protocol_version")));
+			goto error;
+		}
+	}
+
+	return 0;
+error:
+	return -1;
+}
+
+int
+be_tls_open_server(Port *port)
+{
+	SECStatus	status;
+	PRFileDesc *model;
+	PRFileDesc *pr_fd;
+	PRFileDesc *layer;
+	CERTCertificate *server_cert;
+	SECKEYPrivateKey *private_key;
+	CERTSignedCrl *crl;
+	SECItem		crlname;
+	secuPWData	pwdata = {PW_NONE, 0};	/* TODO: This is a bogus callback */
+	char	   *cert_database;
+	NSSInitParameters params;
+
+	/*
+	 * The NSPR documentation states that runtime initialization via PR_Init
+	 * is no longer required, as the first caller into NSPR will perform the
+	 * initialization implicitly. The documentation doesn't however clarify
+	 * from which version this is holds true, so let's perform the potentially
+	 * superfluous initialization anyways to avoid crashing on older versions
+	 * of NSPR, as there is no difference in overhead.  The NSS documentation
+	 * still states that PR_Init must be called in some way (implicitly or
+	 * explicitly).
+	 *
+	 * The below parameters are what the implicit initialization would've done
+	 * for us, and should work even for older versions where it might not be
+	 * done automatically. The last parameter, maxPTDs, is set to various
+	 * values in other codebases, but has been unused since NSPR 2.1 which was
+	 * released sometime in 1998.
+	 */
+	PR_Init(PR_USER_THREAD, PR_PRIORITY_NORMAL, 0 /* maxPTDs */ );
+
+	/*
+	 * The certificate path (configdir) must contain a valid NSS database. If
+	 * the certificate path isn't a valid directory, NSS will fall back on the
+	 * system certificate database. If the certificate path is a directory but
+	 * is empty then the initialization will fail. On the client side this can
+	 * be allowed for any sslmode but the verify-xxx ones.
+	 * https://bugzilla.redhat.com/show_bug.cgi?id=728562 For the server side
+	 * we wont allow this to fail however, as we require the certificate and
+	 * key to exist.
+	 *
+	 * The original design of NSS was for a single application to use a single
+	 * copy of it, initialized with NSS_Initialize() which isn't returning any
+	 * handle with which to refer to NSS. NSS initialization and shutdown are
+	 * global for the application, so a shutdown in another NSS enabled
+	 * library would cause NSS to be stopped for libpq as well.  The fix has
+	 * been to introduce NSS_InitContext which returns a context handle to
+	 * pass to NSS_ShutdownContext.  NSS_InitContext was introduced in NSS
+	 * 3.12, but the use of it is not very well documented.
+	 * https://bugzilla.redhat.com/show_bug.cgi?id=738456
+	 *
+	 * The InitParameters struct passed can be used to override internal
+	 * values in NSS, but the usage is not documented at all. When using
+	 * NSS_Init initializations, the values are instead set via PK11_Configure
+	 * calls so the PK11_Configure documentation can be used to glean some
+	 * details on these.
+	 *
+	 * https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS/PKCS11/Module_Specs
+	 */
+	memset(&params, '\0', sizeof(params));
+	params.length = sizeof(params);
+
+	if (!ssl_database || strlen(ssl_database) == 0)
+		ereport(FATAL,
+				(errmsg("no certificate database specified")));
+
+	cert_database = psprintf("sql:%s", ssl_database);
+	nss_context = NSS_InitContext(cert_database, "", "", "",
+								  &params,
+								  NSS_INIT_READONLY | NSS_INIT_PK11RELOAD);
+	pfree(cert_database);
+
+	if (!nss_context)
+		ereport(FATAL,
+				(errmsg("unable to read certificate database \"%s\": %s",
+						ssl_database, pg_SSLerrmessage(PR_GetError()))));
+
+	/*
+	 * Set the passphrase callback which will be used both to obtain the
+	 * passphrase from the user, as well as by NSS to obtain the phrase
+	 * repeatedly.
+	 *
+	 * TODO: Figure this out - do note that we are setting another password
+	 * callback below for cert/key as well. Need to make sense of all these.
+	 */
+	PK11_SetPasswordFunc(ssl_passphrase_callback);
+
+	/*
+	 * Import the already opened socket as we don't want to use NSPR functions
+	 * for opening the network socket due to how the PostgreSQL protocol works
+	 * with TLS connections. This function is not part of the NSPR public API,
+	 * see the comment at the top of the file for the rationale of still using
+	 * it.
+	 */
+	pr_fd = PR_ImportTCPSocket(port->sock);
+	if (!pr_fd)
+		ereport(ERROR,
+				(errmsg("unable to connect to socket")));
+
+	/*
+	 * Most of the documentation available, and implementations of, NSS/NSPR
+	 * use the PR_NewTCPSocket() function here, which has the drawback that it
+	 * can only create IPv4 sockets. Instead use PR_OpenTCPSocket() which
+	 * copes with IPv6 as well.
+	 */
+	model = PR_OpenTCPSocket(port->laddr.addr.ss_family);
+	if (!model)
+		ereport(ERROR,
+				(errmsg("unable to open socket")));
+
+	/*
+	 * Convert the NSPR socket to an SSL socket. Ensuring the success of this
+	 * operation is critical as NSS SSL_* functions may return SECSuccess on
+	 * the socket even though SSL hasn't been enabled, which introduce a risk
+	 * of silent downgrades.
+	 */
+	model = SSL_ImportFD(NULL, model);
+	if (!model)
+		ereport(ERROR,
+				(errmsg("unable to enable TLS on socket")));
+
+	/*
+	 * Configure basic settings for the connection over the SSL socket in
+	 * order to set it up as a server.
+	 */
+	if (SSL_OptionSet(model, SSL_SECURITY, PR_TRUE) != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to configure TLS connection")));
+
+	if (SSL_OptionSet(model, SSL_HANDSHAKE_AS_SERVER, PR_TRUE) != SECSuccess ||
+		SSL_OptionSet(model, SSL_HANDSHAKE_AS_CLIENT, PR_FALSE) != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to configure TLS connection as server")));
+
+	/*
+	 * SSLv2 is disabled by default, and SSLv3 will be excluded from the range
+	 * of allowed protocols further down. Since we really don't want these to
+	 * ever be enabled, let's use belts and suspenders and explicitly turn
+	 * them off as well.
+	 */
+	SSL_OptionSet(model, SSL_ENABLE_SSL2, PR_FALSE);
+	SSL_OptionSet(model, SSL_ENABLE_SSL3, PR_FALSE);
+
+#ifdef SSL_CBC_RANDOM_IV
+
+	/*
+	 * Enable protection against the BEAST attack in case the NSS server has
+	 * support for that. While SSLv3 is disabled, we may still allow TLSv1
+	 * which is affected. The option isn't documented as an SSL option, but as
+	 * an NSS environment variable.
+	 */
+	SSL_OptionSet(model, SSL_CBC_RANDOM_IV, PR_TRUE);
+#endif
+
+	/*
+	 * Configure the allowed cipher. If there are no user preferred suites,
+	 * set the domestic policy. TODO: while this code works, the set of
+	 * ciphers which can be set and still end up with a working socket is
+	 * woefully underdocumented for anything more recent than SSLv3 (the code
+	 * for TLS actually calls ssl3 functions under the hood for
+	 * SSL_CipherPrefSet), so it's unclear if this is helpful or not. Using
+	 * the policies works, but may be too coarsely grained.
+	 *
+	 * Another TODO: The SSL_ImplementedCiphers table returned with calling
+	 * SSL_GetImplementedCiphers is sorted in server preference order. Sorting
+	 * SSLCipherSuites according to the order of the ciphers therein could be
+	 * a way to implement ssl_prefer_server_ciphers - if we at all want to use
+	 * cipher selection for NSS like how we do it for OpenSSL that is.
+	 */
+
+	/*
+	 * If no ciphers are specified, we use the domestic policy
+	 */
+	if (!SSLCipherSuites || strlen(SSLCipherSuites) == 0)
+	{
+		status = NSS_SetDomesticPolicy();
+		if (status != SECSuccess)
+			ereport(ERROR,
+					(errmsg("unable to set cipher policy: %s",
+							pg_SSLerrmessage(PR_GetError()))));
+	}
+	else
+	{
+		char	   *ciphers,
+				   *c;
+
+		char	   *sep = ":;, ";
+		PRUint16	ciphercode;
+		const		PRUint16 *nss_ciphers;
+
+		/*
+		 * If the user has specified a set of preferred cipher suites we start
+		 * by turning off all the existing suites to avoid the risk of down-
+		 * grades to a weaker cipher than expected.
+		 */
+		nss_ciphers = SSL_GetImplementedCiphers();
+		for (int i = 0; i < SSL_GetNumImplementedCiphers(); i++)
+			SSL_CipherPrefSet(model, nss_ciphers[i], PR_FALSE);
+
+		ciphers = pstrdup(SSLCipherSuites);
+
+		for (c = strtok(ciphers, sep); c; c = strtok(NULL, sep))
+		{
+			ciphercode = pg_find_cipher(c);
+			if (ciphercode != INVALID_CIPHER)
+			{
+				status = SSL_CipherPrefSet(model, ciphercode, PR_TRUE);
+				if (status != SECSuccess)
+					ereport(ERROR,
+							(errmsg("invalid cipher-suite specified: %s", c)));
+			}
+		}
+
+		pfree(ciphers);
+	}
+
+	if (SSL_VersionRangeSet(model, &desired_sslver) != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to set requested SSL protocol version range")));
+
+	/*
+	 * Set up the custom IO layer.
+	 */
+	layer = init_iolayer(port, ERROR);
+	if (!layer)
+		goto error;
+
+	/* Store the Port as private data available in callbacks */
+	layer->secret = (void *) port;
+
+	if (PR_PushIOLayer(pr_fd, PR_TOP_IO_LAYER, layer) != PR_SUCCESS)
+	{
+		PR_Close(layer);
+		ereport(ERROR,
+				(errmsg("unable to push IO layer")));
+	}
+
+	/* TODO: set the postgres password callback param as callback function */
+	server_cert = PK11_FindCertFromNickname(ssl_cert_file, &pwdata /* password callback */ );
+	if (!server_cert)
+		ereport(ERROR,
+				(errmsg("unable to find certificate for \"%s\": %s",
+						ssl_cert_file, pg_SSLerrmessage(PR_GetError()))));
+
+	/* TODO: set the postgres password callback param as callback function */
+	private_key = PK11_FindKeyByAnyCert(server_cert, &pwdata /* password callback */ );
+	if (!private_key)
+		ereport(ERROR,
+				(errmsg("unable to find private key for \"%s\": %s",
+						ssl_cert_file, pg_SSLerrmessage(PR_GetError()))));
+
+	/*
+	 * NSS doesn't use CRL files on disk, so we use the ssl_crl_file guc to
+	 * contain the CRL nickname for the current server certificate in the NSS
+	 * certificate database. The main difference from the OpenSSL backend is
+	 * that NSS will use the CRL regardless, but being able to make sure the
+	 * CRL is loaded seems like a good feature.
+	 */
+	if (ssl_crl_file[0])
+	{
+		SECITEM_CopyItem(NULL, &crlname, &server_cert->derSubject);
+		crl = SEC_FindCrlByName(CERT_GetDefaultCertDB(), &crlname, SEC_CRL_TYPE);
+		if (!crl)
+			ereport(ERROR,
+					(errmsg("specified CRL not found in database")));
+		SEC_DestroyCrl(crl);
+	}
+
+	/*
+	 * Finally we must configure the socket for being a server by setting the
+	 * certificate and key.
+	 */
+	status = SSL_ConfigSecureServer(model, server_cert, private_key, kt_rsa);
+	if (status != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to configure secure server: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+	status = SSL_ConfigServerCert(model, server_cert, private_key, NULL, 0);
+	if (status != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to configure server for TLS server connections: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+
+	ssl_loaded_verify_locations = true;
+
+	/*
+	 * At this point, we no longer have use for the certificate and private
+	 * key as they have been copied into the context by NSS. Destroy our
+	 * copies explicitly to clean out the memory as best we can.
+	 */
+	CERT_DestroyCertificate(server_cert);
+	SECKEY_DestroyPrivateKey(private_key);
+
+	status = SSL_AuthCertificateHook(model, pg_cert_auth_handler, (void *) port);
+	if (status != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to install authcert hook: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+	SSL_BadCertHook(model, pg_bad_cert_handler, (void *) port);
+	SSL_OptionSet(model, SSL_REQUEST_CERTIFICATE, PR_TRUE);
+	SSL_OptionSet(model, SSL_REQUIRE_CERTIFICATE, PR_FALSE);
+
+	port->pr_fd = SSL_ImportFD(model, pr_fd);
+	if (!port->pr_fd)
+		ereport(ERROR,
+				(errmsg("unable to initialize")));
+
+	PR_Close(model);
+
+	/*
+	 * Force a handshake on the next I/O request, the second parameter means
+	 * that we are a server, PR_FALSE would indicate being a client. NSPR
+	 * requires us to call SSL_ResetHandshake since we imported an already
+	 * established socket.
+	 */
+	status = SSL_ResetHandshake(port->pr_fd, PR_TRUE);
+	if (status != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to initiate handshake: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+	status = SSL_ForceHandshake(port->pr_fd);
+	if (status != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to handshake: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+
+	port->ssl_in_use = true;
+	return 0;
+
+error:
+	return 1;
+}
+
+ssize_t
+be_tls_read(Port *port, void *ptr, size_t len, int *waitfor)
+{
+	ssize_t		n_read;
+	PRErrorCode err;
+
+	n_read = PR_Read(port->pr_fd, ptr, len);
+
+	if (n_read < 0)
+	{
+		err = PR_GetError();
+
+		/* XXX: This logic seems potentially bogus? */
+		if (err == PR_WOULD_BLOCK_ERROR)
+			*waitfor = WL_SOCKET_READABLE;
+		else
+			*waitfor = WL_SOCKET_WRITEABLE;
+	}
+
+	return n_read;
+}
+
+ssize_t
+be_tls_write(Port *port, void *ptr, size_t len, int *waitfor)
+{
+	ssize_t		n_write;
+	PRErrorCode err;
+
+	n_write = PR_Send(port->pr_fd, ptr, len, 0, PR_INTERVAL_NO_WAIT);
+
+	if (n_write < 0)
+	{
+		err = PR_GetError();
+
+		if (err == PR_WOULD_BLOCK_ERROR)
+			*waitfor = WL_SOCKET_WRITEABLE;
+		else
+			*waitfor = WL_SOCKET_READABLE;
+	}
+
+	return n_write;
+}
+
+void
+be_tls_close(Port *port)
+{
+	if (!port)
+		return;
+
+	if (port->peer_cn)
+	{
+		SSL_InvalidateSession(port->pr_fd);
+		pfree(port->peer_cn);
+		port->peer_cn = NULL;
+	}
+
+	PR_Close(port->pr_fd);
+	port->pr_fd = NULL;
+	port->ssl_in_use = false;
+
+	if (nss_context)
+	{
+		NSS_ShutdownContext(nss_context);
+		nss_context = NULL;
+	}
+}
+
+void
+be_tls_destroy(void)
+{
+	/*
+	 * It reads a bit odd to clear a session cache when we are destroying the
+	 * context altogether, but if the session cache isn't cleared before
+	 * shutting down the context it will fail with SEC_ERROR_BUSY.
+	 */
+	SSL_ClearSessionCache();
+}
+
+int
+be_tls_get_cipher_bits(Port *port)
+{
+	SECStatus	status;
+	SSLChannelInfo channel;
+	SSLCipherSuiteInfo suite;
+
+	status = SSL_GetChannelInfo(port->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+		goto error;
+
+	status = SSL_GetCipherSuiteInfo(channel.cipherSuite, &suite, sizeof(suite));
+	if (status != SECSuccess)
+		goto error;
+
+	return suite.effectiveKeyBits;
+
+error:
+	ereport(WARNING,
+			(errmsg("unable to extract TLS session information: %s",
+					pg_SSLerrmessage(PR_GetError()))));
+	return 0;
+}
+
+/*
+ * be_tls_get_compression
+ *
+ * NSS disabled support for TLS compression in version 3.33 and removed the
+ * code in a subsequent release. The API for retrieving information about
+ * compression as well as enabling it is kept for backwards compatibility, but
+ * we don't need to consult it since it was only available for SSLv3 which we
+ * don't support.
+ *
+ * https://bugzilla.mozilla.org/show_bug.cgi?id=1409587
+ */
+bool
+be_tls_get_compression(Port *port)
+{
+	return false;
+}
+
+const char *
+be_tls_get_version(Port *port)
+{
+	SECStatus	status;
+	SSLChannelInfo channel;
+
+	status = SSL_GetChannelInfo(port->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+	{
+		ereport(WARNING,
+				(errmsg("unable to extract TLS session information: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+		return NULL;
+	}
+
+	return ssl_protocol_version_to_string(channel.protocolVersion);
+}
+
+const char *
+be_tls_get_cipher(Port *port)
+{
+	SECStatus	status;
+	SSLChannelInfo channel;
+	SSLCipherSuiteInfo suite;
+
+	status = SSL_GetChannelInfo(port->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+		goto error;
+
+	status = SSL_GetCipherSuiteInfo(channel.cipherSuite, &suite, sizeof(suite));
+	if (status != SECSuccess)
+		goto error;
+
+	return suite.cipherSuiteName;
+
+error:
+	ereport(WARNING,
+			(errmsg("unable to extract TLS session information: %s",
+					pg_SSLerrmessage(PR_GetError()))));
+	return NULL;
+}
+
+void
+be_tls_get_peer_subject_name(Port *port, char *ptr, size_t len)
+{
+	CERTCertificate *certificate;
+
+	certificate = SSL_PeerCertificate(port->pr_fd);
+	if (certificate)
+		strlcpy(ptr, CERT_NameToAscii(&certificate->subject), len);
+	else
+		ptr[0] = '\0';
+}
+
+void
+be_tls_get_peer_issuer_name(Port *port, char *ptr, size_t len)
+{
+	CERTCertificate *certificate;
+
+	certificate = SSL_PeerCertificate(port->pr_fd);
+	if (certificate)
+		strlcpy(ptr, CERT_NameToAscii(&certificate->issuer), len);
+	else
+		ptr[0] = '\0';
+}
+
+void
+be_tls_get_peer_serial(Port *port, char *ptr, size_t len)
+{
+	CERTCertificate *certificate;
+
+	certificate = SSL_PeerCertificate(port->pr_fd);
+	if (certificate)
+		snprintf(ptr, len, "%li", DER_GetInteger(&(certificate->serialNumber)));
+	else
+		ptr[0] = '\0';
+}
+
+static SECStatus
+pg_bad_cert_handler(void *arg, PRFileDesc * fd)
+{
+	Port	   *port = (Port *) arg;
+
+	port->peer_cert_valid = false;
+	return SECFailure;
+}
+
+static SECStatus
+pg_cert_auth_handler(void *arg, PRFileDesc * fd, PRBool checksig, PRBool isServer)
+{
+	SECStatus	status;
+	Port	   *port = (Port *) arg;
+	CERTCertificate *cert;
+	char	   *peer_cn;
+	int			len;
+
+	status = SSL_AuthCertificate(CERT_GetDefaultCertDB(), port->pr_fd, checksig, PR_TRUE);
+	if (status == SECSuccess)
+	{
+		cert = SSL_PeerCertificate(port->pr_fd);
+		len = strlen(cert->subjectName);
+		peer_cn = MemoryContextAllocZero(TopMemoryContext, len + 1);
+		if (strncmp(cert->subjectName, "CN=", 3) == 0)
+			strlcpy(peer_cn, cert->subjectName + strlen("CN="), len + 1);
+		else
+			strlcpy(peer_cn, cert->subjectName, len + 1);
+		CERT_DestroyCertificate(cert);
+
+		port->peer_cn = peer_cn;
+		port->peer_cert_valid = true;
+	}
+
+	return status;
+}
+
+/* ------------------------------------------------------------ */
+/*						Internal functions						*/
+/* ------------------------------------------------------------ */
+
+static PRInt32
+pg_ssl_read(PRFileDesc * fd, void *buf, PRInt32 amount, PRIntn flags,
+			PRIntervalTime timeout)
+{
+	PRRecvFN	read_fn;
+	PRInt32		n_read;
+
+	read_fn = fd->lower->methods->recv;
+	n_read = read_fn(fd->lower, buf, amount, flags, timeout);
+
+	return n_read;
+}
+
+static PRInt32
+pg_ssl_write(PRFileDesc * fd, const void *buf, PRInt32 amount, PRIntn flags,
+			 PRIntervalTime timeout)
+{
+	PRSendFN	send_fn;
+	PRInt32		n_write;
+
+	send_fn = fd->lower->methods->send;
+	n_write = send_fn(fd->lower, buf, amount, flags, timeout);
+
+	return n_write;
+}
+
+static PRFileDesc *
+init_iolayer(Port *port, int loglevel)
+{
+	const		PRIOMethods *default_methods;
+	PRFileDesc *layer;
+
+	/*
+	 * Start by initializing our layer with all the default methods so that we
+	 * can selectively override the ones we want while still ensuring that we
+	 * have a complete layer specification.
+	 */
+	default_methods = PR_GetDefaultIOMethods();
+	memcpy(&pr_iomethods, default_methods, sizeof(PRIOMethods));
+
+	pr_iomethods.recv = pg_ssl_read;
+	pr_iomethods.send = pg_ssl_write;
+
+	/*
+	 * Each IO layer must be identified by a unique name, where uniqueness is
+	 * per connection. Each connection in a postgres cluster can generate the
+	 * identity from the same string as they will create their IO layers on
+	 * different sockets. Only one layer per socket can have the same name.
+	 */
+	pr_id = PR_GetUniqueIdentity("PostgreSQL");
+	if (pr_id == PR_INVALID_IO_LAYER)
+	{
+		ereport(loglevel,
+				(errmsg("out of memory when setting up TLS connection")));
+		return NULL;
+	}
+
+	/*
+	 * Create the actual IO layer as a stub such that it can be pushed onto
+	 * the layer stack. The step via a stub is required as we define custom
+	 * callbacks.
+	 */
+	layer = PR_CreateIOLayerStub(pr_id, &pr_iomethods);
+	if (!layer)
+	{
+		ereport(loglevel,
+				(errmsg("unable to create NSS I/O layer")));
+		return NULL;
+	}
+
+	return layer;
+}
+
+static char *
+ssl_protocol_version_to_string(int v)
+{
+	switch (v)
+	{
+			/* SSL v2 and v3 are not supported */
+		case SSL_LIBRARY_VERSION_2:
+		case SSL_LIBRARY_VERSION_3_0:
+			Assert(false);
+			break;
+
+		case SSL_LIBRARY_VERSION_TLS_1_0:
+			return pstrdup("TLSv1.0");
+		case SSL_LIBRARY_VERSION_TLS_1_1:
+			return pstrdup("TLSv1.1");
+		case SSL_LIBRARY_VERSION_TLS_1_2:
+			return pstrdup("TLSv1.2");
+		case SSL_LIBRARY_VERSION_TLS_1_3:
+			return pstrdup("TLSv1.3");
+	}
+
+	return pstrdup("unknown");
+}
+
+
+/*
+ * ssl_protocol_version_to_nss
+ *			Translate PostgreSQL TLS version to NSS version
+ *
+ * Returns zero in case the requested TLS version is undefined (PG_ANY) and
+ * should be set by the caller, or -1 on failure.
+ */
+static uint16
+ssl_protocol_version_to_nss(int v, const char *guc_name)
+{
+	switch (v)
+	{
+			/*
+			 * There is no SSL_LIBRARY_ macro defined in NSS with the value
+			 * zero, so we use this to signal the caller that the highest
+			 * useful version should be set on the connection.
+			 */
+		case PG_TLS_ANY:
+			return 0;
+
+			/*
+			 * No guard is required here as there are no versions of NSS
+			 * without support for TLS1.
+			 */
+		case PG_TLS1_VERSION:
+			return SSL_LIBRARY_VERSION_TLS_1_0;
+		case PG_TLS1_1_VERSION:
+#ifdef SSL_LIBRARY_VERSION_TLS_1_1
+			return SSL_LIBRARY_VERSION_TLS_1_1;
+#else
+			break;
+#endif
+		case PG_TLS1_2_VERSION:
+#ifdef SSL_LIBRARY_VERSION_TLS_1_2
+			return SSL_LIBRARY_VERSION_TLS_1_2;
+#else
+			break;
+#endif
+		case PG_TLS1_3_VERSION:
+#ifdef SSL_LIBRARY_VERSION_TLS_1_3
+			return SSL_LIBRARY_VERSION_TLS_1_3;
+#else
+			break;
+#endif
+		default:
+			break;
+	}
+
+	return -1;
+}
+
+/*
+ * pg_SSLerrmessage
+ *		Create and return a human readable error message given
+ *		the specified error code
+ *
+ * PR_ErrorToName only converts the enum identifier of the error to string,
+ * but that can be quite useful for debugging (and in case PR_ErrorToString is
+ * unable to render a message then we at least have something).
+ */
+static char *
+pg_SSLerrmessage(PRErrorCode errcode)
+{
+	char		error[128];
+	int			ret;
+
+	/* TODO: this should perhaps use a StringInfo instead.. */
+	ret = pg_snprintf(error, sizeof(error), "%s (%s)",
+					  PR_ErrorToString(errcode, PR_LANGUAGE_I_DEFAULT),
+					  PR_ErrorToName(errcode));
+	if (ret)
+		return pstrdup(error);
+
+	return pstrdup(_("unknown TLS error"));
+}
diff --git a/src/backend/libpq/be-secure-openssl.c b/src/backend/libpq/be-secure-openssl.c
index 8b21ff4065..5962cffc0c 100644
--- a/src/backend/libpq/be-secure-openssl.c
+++ b/src/backend/libpq/be-secure-openssl.c
@@ -1298,15 +1298,28 @@ X509_NAME_to_cstring(X509_NAME *name)
 	char	   *dp;
 	char	   *result;
 
+	if (membuf == NULL)
+		ereport(ERROR,
+				(errcode(ERRCODE_OUT_OF_MEMORY),
+				 errmsg("failed to create BIO")));
+
 	(void) BIO_set_close(membuf, BIO_CLOSE);
 	for (i = 0; i < count; i++)
 	{
 		e = X509_NAME_get_entry(name, i);
 		nid = OBJ_obj2nid(X509_NAME_ENTRY_get_object(e));
+		if (nid == NID_undef)
+			ereport(ERROR,
+					(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
+					 errmsg("could not get NID for ASN1_OBJECT object")));
 		v = X509_NAME_ENTRY_get_data(e);
 		field_name = OBJ_nid2sn(nid);
 		if (!field_name)
 			field_name = OBJ_nid2ln(nid);
+		if (field_name == NULL)
+			ereport(ERROR,
+					(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
+					 errmsg("could not convert NID %d to an ASN1_OBJECT structure", nid)));
 		BIO_printf(membuf, "/%s=", field_name);
 		ASN1_STRING_print_ex(membuf, v,
 							 ((ASN1_STRFLGS_RFC2253 & ~ASN1_STRFLGS_ESC_MSB)
@@ -1322,7 +1335,8 @@ X509_NAME_to_cstring(X509_NAME *name)
 	result = pstrdup(dp);
 	if (dp != sp)
 		pfree(dp);
-	BIO_free(membuf);
+	if (BIO_free(membuf) != 1)
+		elog(ERROR, "could not free OpenSSL BIO structure");
 
 	return result;
 }
diff --git a/src/backend/libpq/be-secure.c b/src/backend/libpq/be-secure.c
index 2ae507a902..f39977b80c 100644
--- a/src/backend/libpq/be-secure.c
+++ b/src/backend/libpq/be-secure.c
@@ -49,6 +49,9 @@ bool		ssl_passphrase_command_supports_reload;
 #ifdef USE_SSL
 bool		ssl_loaded_verify_locations = false;
 #endif
+#ifdef USE_NSS
+char	   *ssl_database;
+#endif
 
 /* GUC variable controlling SSL cipher list */
 char	   *SSLCipherSuites = NULL;
diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c
index de87ad6ef7..33c3eebf48 100644
--- a/src/backend/utils/misc/guc.c
+++ b/src/backend/utils/misc/guc.c
@@ -4262,7 +4262,11 @@ static struct config_string ConfigureNamesString[] =
 		},
 		&ssl_library,
 #ifdef USE_SSL
+#if defined(USE_OPENSSL)
 		"OpenSSL",
+#elif defined(USE_NSS)
+		"NSS",
+#endif
 #else
 		"",
 #endif
@@ -4320,6 +4324,18 @@ static struct config_string ConfigureNamesString[] =
 		check_canonical_path, assign_pgstat_temp_directory, NULL
 	},
 
+#ifdef USE_NSS
+	{
+		{"ssl_database", PGC_SIGHUP, CONN_AUTH_SSL,
+			gettext_noop("Location of the NSS certificate database."),
+			NULL
+		},
+		&ssl_database,
+		"",
+		NULL, NULL, NULL
+	},
+#endif
+
 	{
 		{"synchronous_standby_names", PGC_SIGHUP, REPLICATION_PRIMARY,
 			gettext_noop("Number of synchronous standbys and list of names of potential synchronous ones."),
@@ -4348,8 +4364,10 @@ static struct config_string ConfigureNamesString[] =
 			GUC_SUPERUSER_ONLY
 		},
 		&SSLCipherSuites,
-#ifdef USE_OPENSSL
+#if defined(USE_OPENSSL)
 		"HIGH:MEDIUM:+3DES:!aNULL",
+#elif defined (USE_NSS)
+		"",
 #else
 		"none",
 #endif
diff --git a/src/include/common/pg_nss.h b/src/include/common/pg_nss.h
new file mode 100644
index 0000000000..74298c8bb1
--- /dev/null
+++ b/src/include/common/pg_nss.h
@@ -0,0 +1,141 @@
+/*-------------------------------------------------------------------------
+ *
+ * pg_nss.h
+ *	  Support for NSS as a TLS backend
+ *
+ * These definitions are used by both frontend and backend code.
+ *
+ * Copyright (c) 2020, PostgreSQL Global Development Group
+ *
+ * IDENTIFICATION
+ *        src/include/common/pg_nss.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef PG_NSS_H
+#define PG_NSS_H
+
+#ifdef USE_NSS
+
+#include <sslproto.h>
+
+PRUint16	pg_find_cipher(char *name);
+
+typedef struct
+{
+	const char *name;
+	PRUint16	number;
+}			NSSCiphers;
+
+#define INVALID_CIPHER	0xFFFF
+
+/*
+ * This list is a partial copy of the ciphers in NSS files lib/ssl/sslproto.h
+ * in order to provide a human readable version of the ciphers. It would be
+ * nice to not have to have this, but NSS doesn't provide any API addressing
+ * the ciphers by name. TODO: do we want more of the ciphers, or perhaps less?
+ */
+static const NSSCiphers NSS_CipherList[] = {
+
+	{"TLS_NULL_WITH_NULL_NULL", TLS_NULL_WITH_NULL_NULL},
+
+	{"TLS_RSA_WITH_NULL_MD5", TLS_RSA_WITH_NULL_MD5},
+	{"TLS_RSA_WITH_NULL_SHA", TLS_RSA_WITH_NULL_SHA},
+	{"TLS_RSA_WITH_RC4_128_MD5", TLS_RSA_WITH_RC4_128_MD5},
+	{"TLS_RSA_WITH_RC4_128_SHA", TLS_RSA_WITH_RC4_128_SHA},
+	{"TLS_RSA_WITH_IDEA_CBC_SHA", TLS_RSA_WITH_IDEA_CBC_SHA},
+	{"TLS_RSA_WITH_DES_CBC_SHA", TLS_RSA_WITH_DES_CBC_SHA},
+	{"TLS_RSA_WITH_3DES_EDE_CBC_SHA", TLS_RSA_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_DH_DSS_WITH_DES_CBC_SHA", TLS_DH_DSS_WITH_DES_CBC_SHA},
+	{"TLS_DH_DSS_WITH_3DES_EDE_CBC_SHA", TLS_DH_DSS_WITH_3DES_EDE_CBC_SHA},
+	{"TLS_DH_RSA_WITH_DES_CBC_SHA", TLS_DH_RSA_WITH_DES_CBC_SHA},
+	{"TLS_DH_RSA_WITH_3DES_EDE_CBC_SHA", TLS_DH_RSA_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_DHE_DSS_WITH_DES_CBC_SHA", TLS_DHE_DSS_WITH_DES_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_3DES_EDE_CBC_SHA", TLS_DHE_DSS_WITH_3DES_EDE_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_DES_CBC_SHA", TLS_DHE_RSA_WITH_DES_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA", TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_DH_anon_WITH_RC4_128_MD5", TLS_DH_anon_WITH_RC4_128_MD5},
+	{"TLS_DH_anon_WITH_DES_CBC_SHA", TLS_DH_anon_WITH_DES_CBC_SHA},
+	{"TLS_DH_anon_WITH_3DES_EDE_CBC_SHA", TLS_DH_anon_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_RSA_WITH_AES_128_CBC_SHA", TLS_RSA_WITH_AES_128_CBC_SHA},
+	{"TLS_DH_DSS_WITH_AES_128_CBC_SHA", TLS_DH_DSS_WITH_AES_128_CBC_SHA},
+	{"TLS_DH_RSA_WITH_AES_128_CBC_SHA", TLS_DH_RSA_WITH_AES_128_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_AES_128_CBC_SHA", TLS_DHE_DSS_WITH_AES_128_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_AES_128_CBC_SHA", TLS_DHE_RSA_WITH_AES_128_CBC_SHA},
+	{"TLS_DH_anon_WITH_AES_128_CBC_SHA", TLS_DH_anon_WITH_AES_128_CBC_SHA},
+
+	{"TLS_RSA_WITH_AES_256_CBC_SHA", TLS_RSA_WITH_AES_256_CBC_SHA},
+	{"TLS_DH_DSS_WITH_AES_256_CBC_SHA", TLS_DH_DSS_WITH_AES_256_CBC_SHA},
+	{"TLS_DH_RSA_WITH_AES_256_CBC_SHA", TLS_DH_RSA_WITH_AES_256_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_AES_256_CBC_SHA", TLS_DHE_DSS_WITH_AES_256_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_AES_256_CBC_SHA", TLS_DHE_RSA_WITH_AES_256_CBC_SHA},
+	{"TLS_DH_anon_WITH_AES_256_CBC_SHA", TLS_DH_anon_WITH_AES_256_CBC_SHA},
+	{"TLS_RSA_WITH_NULL_SHA256", TLS_RSA_WITH_NULL_SHA256},
+	{"TLS_RSA_WITH_AES_128_CBC_SHA256", TLS_RSA_WITH_AES_128_CBC_SHA256},
+	{"TLS_RSA_WITH_AES_256_CBC_SHA256", TLS_RSA_WITH_AES_256_CBC_SHA256},
+
+	{"TLS_DHE_DSS_WITH_AES_128_CBC_SHA256", TLS_DHE_DSS_WITH_AES_128_CBC_SHA256},
+	{"TLS_RSA_WITH_CAMELLIA_128_CBC_SHA", TLS_RSA_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DH_DSS_WITH_CAMELLIA_128_CBC_SHA", TLS_DH_DSS_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DH_RSA_WITH_CAMELLIA_128_CBC_SHA", TLS_DH_RSA_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_CAMELLIA_128_CBC_SHA", TLS_DHE_DSS_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA", TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DH_anon_WITH_CAMELLIA_128_CBC_SHA", TLS_DH_anon_WITH_CAMELLIA_128_CBC_SHA},
+
+	{"TLS_DHE_DSS_WITH_RC4_128_SHA", TLS_DHE_DSS_WITH_RC4_128_SHA},
+	{"TLS_DHE_RSA_WITH_AES_128_CBC_SHA256", TLS_DHE_RSA_WITH_AES_128_CBC_SHA256},
+	{"TLS_DHE_DSS_WITH_AES_256_CBC_SHA256", TLS_DHE_DSS_WITH_AES_256_CBC_SHA256},
+	{"TLS_DHE_RSA_WITH_AES_256_CBC_SHA256", TLS_DHE_RSA_WITH_AES_256_CBC_SHA256},
+
+	{"TLS_RSA_WITH_CAMELLIA_256_CBC_SHA", TLS_RSA_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DH_DSS_WITH_CAMELLIA_256_CBC_SHA", TLS_DH_DSS_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DH_RSA_WITH_CAMELLIA_256_CBC_SHA", TLS_DH_RSA_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_CAMELLIA_256_CBC_SHA", TLS_DHE_DSS_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA", TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DH_anon_WITH_CAMELLIA_256_CBC_SHA", TLS_DH_anon_WITH_CAMELLIA_256_CBC_SHA},
+
+	{"TLS_RSA_WITH_SEED_CBC_SHA", TLS_RSA_WITH_SEED_CBC_SHA},
+
+	{"TLS_RSA_WITH_AES_128_GCM_SHA256", TLS_RSA_WITH_AES_128_GCM_SHA256},
+	{"TLS_RSA_WITH_AES_256_GCM_SHA384", TLS_RSA_WITH_AES_256_GCM_SHA384},
+	{"TLS_DHE_RSA_WITH_AES_128_GCM_SHA256", TLS_DHE_RSA_WITH_AES_128_GCM_SHA256},
+	{"TLS_DHE_RSA_WITH_AES_256_GCM_SHA384", TLS_DHE_RSA_WITH_AES_256_GCM_SHA384},
+	{"TLS_DHE_DSS_WITH_AES_128_GCM_SHA256", TLS_DHE_DSS_WITH_AES_128_GCM_SHA256},
+	{"TLS_DHE_DSS_WITH_AES_256_GCM_SHA384", TLS_DHE_DSS_WITH_AES_256_GCM_SHA384},
+
+	{"TLS_AES_128_GCM_SHA256", TLS_AES_128_GCM_SHA256},
+	{"TLS_AES_256_GCM_SHA384", TLS_AES_256_GCM_SHA384},
+	{"TLS_CHACHA20_POLY1305_SHA256", TLS_CHACHA20_POLY1305_SHA256},
+	{NULL, 0}
+};
+
+/*
+ * pg_find_cipher
+ *			Translate an NSS ciphername to the cipher code
+ *
+ * Searches the configured ciphers for the corresponding cipher code to the
+ * name. Search is performed case insensitive.
+ */
+PRUint16
+pg_find_cipher(char *name)
+{
+	const		NSSCiphers *cipher_list = NSS_CipherList;
+
+	while (cipher_list->name)
+	{
+		if (pg_strcasecmp(cipher_list->name, name) == 0)
+			return cipher_list->number;
+
+		cipher_list++;
+	}
+
+	return 0xFFFF;
+}
+
+#endif							/* USE_NSS */
+
+#endif							/* PG_NSS_H */
diff --git a/src/include/libpq/libpq-be.h b/src/include/libpq/libpq-be.h
index 179ebaa104..6211510fab 100644
--- a/src/include/libpq/libpq-be.h
+++ b/src/include/libpq/libpq-be.h
@@ -192,13 +192,18 @@ typedef struct Port
 	bool		peer_cert_valid;
 
 	/*
-	 * OpenSSL structures. (Keep these last so that the locations of other
-	 * fields are the same whether or not you build with OpenSSL.)
+	 * SSL backend specific structures. (Keep these last so that the locations
+	 * of other fields are the same whether or not you build with SSL
+	 * enabled.)
 	 */
 #ifdef USE_OPENSSL
 	SSL		   *ssl;
 	X509	   *peer;
 #endif
+
+#ifdef USE_NSS
+	void	   *pr_fd;
+#endif
 } Port;
 
 #ifdef USE_SSL
diff --git a/src/include/libpq/libpq.h b/src/include/libpq/libpq.h
index b1152475ac..298d87ecae 100644
--- a/src/include/libpq/libpq.h
+++ b/src/include/libpq/libpq.h
@@ -88,6 +88,9 @@ extern PGDLLIMPORT bool ssl_passphrase_command_supports_reload;
 #ifdef USE_SSL
 extern bool ssl_loaded_verify_locations;
 #endif
+#ifdef USE_NSS
+extern char *ssl_database;
+#endif
 
 extern int	secure_initialize(bool isServerStart);
 extern bool secure_loaded_verify_locations(void);
diff --git a/src/include/pg_config.h.in b/src/include/pg_config.h.in
index fb270df678..31f808398c 100644
--- a/src/include/pg_config.h.in
+++ b/src/include/pg_config.h.in
@@ -893,6 +893,9 @@
 /* Define to 1 to build with PAM support. (--with-pam) */
 #undef USE_PAM
 
+/* Define to build with NSS support (--with-nss) */
+#undef USE_NSS
+
 /* Define to 1 to use software CRC-32C implementation (slicing-by-8). */
 #undef USE_SLICING_BY_8_CRC32C
 
diff --git a/src/include/pg_config_manual.h b/src/include/pg_config_manual.h
index 705dc69c06..c28b84126d 100644
--- a/src/include/pg_config_manual.h
+++ b/src/include/pg_config_manual.h
@@ -176,10 +176,9 @@
 
 /*
  * USE_SSL code should be compiled only when compiling with an SSL
- * implementation.  (Currently, only OpenSSL is supported, but we might add
- * more implementations in the future.)
+ * implementation.
  */
-#ifdef USE_OPENSSL
+#if defined(USE_OPENSSL) || defined(USE_NSS)
 #define USE_SSL
 #endif
 
diff --git a/src/interfaces/libpq/Makefile b/src/interfaces/libpq/Makefile
index d4919970f8..97821fb39b 100644
--- a/src/interfaces/libpq/Makefile
+++ b/src/interfaces/libpq/Makefile
@@ -57,6 +57,10 @@ OBJS += \
 	fe-secure-gssapi.o
 endif
 
+ifeq ($(with_nss), yes)
+OBJS += fe-secure-nss.o
+endif
+
 ifeq ($(PORTNAME), cygwin)
 override shlib = cyg$(NAME)$(DLSUFFIX)
 endif
diff --git a/src/interfaces/libpq/fe-connect.c b/src/interfaces/libpq/fe-connect.c
index 7bee9dd201..2814eb8ddd 100644
--- a/src/interfaces/libpq/fe-connect.c
+++ b/src/interfaces/libpq/fe-connect.c
@@ -354,6 +354,10 @@ static const internalPQconninfoOption PQconninfoOptions[] = {
 		"Target-Session-Attrs", "", 11, /* sizeof("read-write") = 11 */
 	offsetof(struct pg_conn, target_session_attrs)},
 
+	{"cert_database", NULL, NULL, NULL,
+		"CertificateDatabase", "", 64,
+	offsetof(struct pg_conn, cert_database)},
+
 	/* Terminating entry --- MUST BE LAST */
 	{NULL, NULL, NULL, NULL,
 	NULL, NULL, 0}
diff --git a/src/interfaces/libpq/fe-secure-nss.c b/src/interfaces/libpq/fe-secure-nss.c
new file mode 100644
index 0000000000..6401949136
--- /dev/null
+++ b/src/interfaces/libpq/fe-secure-nss.c
@@ -0,0 +1,975 @@
+/*-------------------------------------------------------------------------
+ *
+ * fe-secure-nss.c
+ *	  functions for supporting NSS as a TLS backend for frontend libpq
+ *
+ * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ *	  src/interfaces/libpq/fe-secure-nss.c
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#include "postgres_fe.h"
+
+#include "libpq-fe.h"
+#include "fe-auth.h"
+#include "libpq-int.h"
+
+/*
+ * BITS_PER_BYTE is also defined in the NSPR header fils, so we need to undef
+ * our version to avoid compiler warnings on redefinition.
+ */
+#define pg_BITS_PER_BYTE BITS_PER_BYTE
+#undef BITS_PER_BYTE
+
+/*
+ * The nspr/obsolete/protypes.h NSPR header typedefs uint64 and int64 with
+ * colliding definitions from ours, causing a much expected compiler error.
+ * The definitions are however not actually used in NSPR at all, and are only
+ * intended for what seems to be backwards compatibility for apps written
+ * against old versions of NSPR.  The following comment is in the referenced
+ * file, and was added in 1998:
+ *
+ *		This section typedefs the old 'native' types to the new PR<type>s.
+ *		These definitions are scheduled to be eliminated at the earliest
+ *		possible time. The NSPR API is implemented and documented using
+ *		the new definitions.
+ *
+ * As there is no opt-out from pulling in these typedefs, we define the guard
+ * for the file to exclude it. This is incredibly ugly, but seems to be about
+ * the only way around it.
+ */
+#define PROTYPES_H
+#include <nspr.h>
+#undef PROTYPES_H
+#include <nss.h>
+#include <ssl.h>
+#include <sslproto.h>
+#include <pk11func.h>
+#include <prerror.h>
+#include <prinit.h>
+#include <prio.h>
+#include <secerr.h>
+#include <secmod.h>
+
+/*
+ * Ensure that the colliding definitions match, else throw an error. In case
+ * NSPR remove the definition in a future version (however unlikely that may
+ * be, make sure to put ours back again.
+ */
+#if defined(BITS_PER_BYTE)
+#if BITS_PER_BYTE != pg_BITS_PER_BYTE
+#error "incompatible byte widths between NSPR and PostgreSQL"
+#endif
+#else
+#define BITS_PER_BYTE pg_BITS_PER_BYTE
+#endif
+#undef pg_BITS_PER_BYTE
+
+static SECStatus pg_load_nss_module(SECMODModule * *module, const char *library, const char *name);
+static SECStatus pg_bad_cert_handler(void *arg, PRFileDesc * fd);
+static char *pg_SSLerrmessage(PRErrorCode errcode);
+static SECStatus pg_client_auth_handler(void *arg, PRFileDesc * socket, CERTDistNames * caNames,
+										CERTCertificate * *pRetCert, SECKEYPrivateKey * *pRetKey);
+static SECStatus pg_cert_auth_handler(void *arg, PRFileDesc * fd, PRBool checksig, PRBool isServer);
+static int	ssl_protocol_version_to_nss(const char *protocol);
+static bool cert_database_has_CA(PGconn *conn);
+
+static char *PQssl_passwd_cb(PK11SlotInfo * slot, PRBool retry, void *arg);
+
+/*
+ * PR_ImportTCPSocket() is a private API, but very widely used, as it's the
+ * only way to make NSS use an already set up POSIX file descriptor rather
+ * than opening one itself. To quote the NSS documentation:
+ *
+ *		"In theory, code that uses PR_ImportTCPSocket may break when NSPR's
+ *		implementation changes. In practice, this is unlikely to happen because
+ *		NSPR's implementation has been stable for years and because of NSPR's
+ *		strong commitment to backward compatibility."
+ *
+ * https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSPR/Reference/PR_ImportTCPSocket
+ *
+ * The function is declared in <private/pprio.h>, but as it is a header marked
+ * private we declare it here rather than including it.
+ */
+NSPR_API(PRFileDesc *) PR_ImportTCPSocket(int);
+
+static SECMODModule * ca_trust = NULL;
+static NSSInitContext * nss_context = NULL;
+
+/*
+ * Track whether the NSS database has a password set or not. There is no API
+ * function for retrieving password status, so we simply flip this to true in
+ * case NSS invoked the password callback - as that will only happen in case
+ * there is a password. The reason for tracking this is that there are calls
+ * which require a password parameter, but doesn't use the callbacks provided,
+ * so we must call the callback on behalf of these.
+ */
+static bool has_password = false;
+
+#if defined(WIN32)
+static const char *ca_trust_name = "nssckbi.dll";
+#elif defined(__darwin__)
+static const char *ca_trust_name = "libnssckbi.dylib";
+#else
+static const char *ca_trust_name = "libnssckbi.so";
+#endif
+
+static PQsslKeyPassHook_nss_type PQsslKeyPassHook = NULL;
+
+/* ------------------------------------------------------------ */
+/*			 Procedures common to all secure sessions			*/
+/* ------------------------------------------------------------ */
+
+void
+pgtls_init_library(bool do_ssl, int do_crypto)
+{
+	/* TODO: implement me .. */
+}
+
+int
+pgtls_init(PGconn *conn)
+{
+	conn->ssl_in_use = false;
+
+	return 0;
+}
+
+void
+pgtls_close(PGconn *conn)
+{
+	if (nss_context)
+	{
+		NSS_ShutdownContext(nss_context);
+		nss_context = NULL;
+	}
+}
+
+PostgresPollingStatusType
+pgtls_open_client(PGconn *conn)
+{
+	SECStatus	status;
+	PRFileDesc *pr_fd;
+	PRFileDesc *model;
+	NSSInitParameters params;
+	SSLVersionRange desired_range;
+
+	/*
+	 * The NSPR documentation states that runtime initialization via PR_Init
+	 * is no longer required, as the first caller into NSPR will perform the
+	 * initialization implicitly. The documentation doesn't however clarify
+	 * from which version this is holds true, so let's perform the potentially
+	 * superfluous initialization anyways to avoid crashing on older versions
+	 * of NSPR, as there is no difference in overhead.  The NSS documentation
+	 * still states that PR_Init must be called in some way (implicitly or
+	 * explicitly).
+	 *
+	 * The below parameters are what the implicit initialization would've done
+	 * for us, and should work even for older versions where it might not be
+	 * done automatically. The last parameter, maxPTDs, is set to various
+	 * values in other codebases, but has been unused since NSPR 2.1 which was
+	 * released sometime in 1998.
+	 */
+	PR_Init(PR_USER_THREAD, PR_PRIORITY_NORMAL, 0);
+
+	/*
+	 * The original design of NSS was for a single application to use a single
+	 * copy of it, initialized with NSS_Initialize() which isn't returning any
+	 * handle with which to refer to NSS. NSS initialization and shutdown are
+	 * global for the application, so a shutdown in another NSS enabled
+	 * library would cause NSS to be stopped for libpq as well.  The fix has
+	 * been to introduce NSS_InitContext which returns a context handle to
+	 * pass to NSS_ShutdownContext.  NSS_InitContext was introduced in NSS
+	 * 3.12, but the use of it is not very well documented.
+	 * https://bugzilla.redhat.com/show_bug.cgi?id=738456
+	 *
+	 * The InitParameters struct passed can be used to override internal
+	 * values in NSS, but the usage is not documented at all. When using
+	 * NSS_Init initializations, the values are instead set via PK11_Configure
+	 * calls so the PK11_Configure documentation can be used to glean some
+	 * details on these.
+	 *
+	 * https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS/PKCS11/Module_Specs
+	 */
+	memset(&params, 0, sizeof(params));
+	params.length = sizeof(params);
+
+	if (conn->cert_database && strlen(conn->cert_database) > 0)
+	{
+		char	   *cert_database_path = psprintf("sql:%s", conn->cert_database);
+
+		nss_context = NSS_InitContext(cert_database_path, "", "", "",
+									  &params,
+									  NSS_INIT_READONLY | NSS_INIT_PK11RELOAD);
+		pfree(cert_database_path);
+	}
+	else
+		nss_context = NSS_InitContext("", "", "", "", &params,
+									  NSS_INIT_READONLY | NSS_INIT_NOCERTDB |
+									  NSS_INIT_NOMODDB | NSS_INIT_FORCEOPEN |
+									  NSS_INIT_NOROOTINIT | NSS_INIT_PK11RELOAD);
+
+	if (!nss_context)
+	{
+		char	   *err = pg_SSLerrmessage(PR_GetError());
+
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to %s certificate database: %s"),
+						  conn->cert_database ? "open" : "create",
+						  err);
+		free(err);
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * Configure cipher policy.
+	 */
+	status = NSS_SetDomesticPolicy();
+	if (status != SECSuccess)
+	{
+		char	   *err = pg_SSLerrmessage(PR_GetError());
+
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to configure cipher policy: %s"),
+						  err);
+		free(err);
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * If we don't have a certificate database, the system trust store is the
+	 * fallback we can use. If we fail to initialize that as well, we can
+	 * still attempt a connection as long as the sslmode isn't verify*.
+	 */
+	if (!conn->cert_database && conn->sslmode[0] == 'v')
+	{
+		status = pg_load_nss_module(&ca_trust, ca_trust_name, "\"Root Certificates\"");
+		/* status = pg_load_nss_module(&ca_trust, ca_trust_name, "trust"); */
+		if (status != SECSuccess)
+		{
+			char	   *err = pg_SSLerrmessage(PR_GetError());
+
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("WARNING: unable to load NSS trust module \"%s\" : %s"), ca_trust_name, err);
+			return PGRES_POLLING_FAILED;
+		}
+	}
+
+
+	PK11_SetPasswordFunc(PQssl_passwd_cb);
+
+	/*
+	 * Import the already opened socket as we don't want to use NSPR functions
+	 * for opening the network socket due to how the PostgreSQL protocol works
+	 * with TLS connections. This function is not part of the NSPR public API,
+	 * see the comment at the top of the file for the rationale of still using
+	 * it.
+	 */
+	pr_fd = PR_ImportTCPSocket(conn->sock);
+	if (!pr_fd)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to attach to socket: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * Most of the documentation available, and implementations of, NSS/NSPR
+	 * use the PR_NewTCPSocket() function here, which has the drawback that it
+	 * can only create IPv4 sockets. Instead use PR_OpenTCPSocket() which
+	 * copes with IPv6 as well.
+	 */
+	model = SSL_ImportFD(NULL, PR_OpenTCPSocket(conn->laddr.addr.ss_family));
+	if (!model)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to enable TLS: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/* Disable old protocol versions (SSLv2 and SSLv3) */
+	SSL_OptionSet(model, SSL_ENABLE_SSL2, PR_FALSE);
+	SSL_OptionSet(model, SSL_V2_COMPATIBLE_HELLO, PR_FALSE);
+	SSL_OptionSet(model, SSL_ENABLE_SSL3, PR_FALSE);
+
+#ifdef SSL_CBC_RANDOM_IV
+
+	/*
+	 * Enable protection against the BEAST attack in case the NSS library has
+	 * support for that. While SSLv3 is disabled, we may still allow TLSv1
+	 * which is affected. The option isn't documented as an SSL option, but as
+	 * an NSS environment variable.
+	 */
+	SSL_OptionSet(model, SSL_CBC_RANDOM_IV, PR_TRUE);
+#endif
+
+	/* Set us up as a TLS client for the handshake */
+	SSL_OptionSet(model, SSL_HANDSHAKE_AS_CLIENT, PR_TRUE);
+
+	/*
+	 * When setting the available protocols, we either use the user defined
+	 * configuration values, and if missing we accept whatever is the highest
+	 * version supported by the library as the max and only limit the range in
+	 * the other end at TLSv1.0. ssl_variant_stream is a ProtocolVariant enum
+	 * for Stream protocols, rather than datagram.
+	 */
+	SSL_VersionRangeGetSupported(ssl_variant_stream, &desired_range);
+	desired_range.min = SSL_LIBRARY_VERSION_TLS_1_0;
+
+	if (conn->ssl_min_protocol_version && strlen(conn->ssl_min_protocol_version) > 0)
+	{
+		int			ssl_min_ver = ssl_protocol_version_to_nss(conn->ssl_min_protocol_version);
+
+		if (ssl_min_ver == -1)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("invalid value \"%s\" for minimum version of SSL protocol\n"),
+							  conn->ssl_min_protocol_version);
+			return -1;
+		}
+
+		desired_range.min = ssl_min_ver;
+	}
+
+	if (conn->ssl_max_protocol_version && strlen(conn->ssl_max_protocol_version) > 0)
+	{
+		int			ssl_max_ver = ssl_protocol_version_to_nss(conn->ssl_max_protocol_version);
+
+		if (ssl_max_ver == -1)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("invalid value \"%s\" for maximum version of SSL protocol\n"),
+							  conn->ssl_max_protocol_version);
+			return -1;
+		}
+
+		desired_range.max = ssl_max_ver;
+	}
+
+	if (SSL_VersionRangeSet(model, &desired_range) != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to set allowed SSL protocol version range: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * Set up callback for verifying server certificates, as well as for how
+	 * to handle failed verifications.
+	 */
+	SSL_AuthCertificateHook(model, pg_cert_auth_handler, (void *) conn);
+	SSL_BadCertHook(model, pg_bad_cert_handler, (void *) conn);
+
+	/*
+	 * Convert the NSPR socket to an SSL socket. Ensuring the success of this
+	 * operation is critical as NSS SSL_* functions may return SECSuccess on
+	 * the socket even though SSL hasn't been enabled, which introduce a risk
+	 * of silent downgrades.
+	 */
+	conn->pr_fd = SSL_ImportFD(model, pr_fd);
+	if (!conn->pr_fd)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to configure client for TLS: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * The model can now we closed as we've applied the settings of the model
+	 * onto the real socket. From hereon we should only use conn->pr_fd.
+	 */
+	PR_Close(model);
+
+	/* Set the private data to be passed to the password callback */
+	SSL_SetPKCS11PinArg(conn->pr_fd, (void *) conn);
+
+	/*
+	 * If a CRL file has been specified, verify if it exists in the database
+	 * but don't fail in case it doesn't.
+	 */
+	if (conn->sslcrl && strlen(conn->sslcrl) > 0)
+	{
+		/* XXX: Implement me.. */
+	}
+
+	status = SSL_ResetHandshake(conn->pr_fd, PR_FALSE);
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to initiate handshake: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * Set callback for client authentication when requested by the server.
+	 */
+	SSL_GetClientAuthDataHook(conn->pr_fd, pg_client_auth_handler, (void *) conn);
+
+	/*
+	 * Specify which hostname we are expecting to talk to. This is required,
+	 * albeit mostly applies to when opening a connection to a traditional
+	 * http server it seems.
+	 */
+	SSL_SetURL(conn->pr_fd, (conn->connhost[conn->whichhost]).host);
+
+	do
+	{
+		status = SSL_ForceHandshake(conn->pr_fd);
+	}
+	while (status != SECSuccess && PR_GetError() == PR_WOULD_BLOCK_ERROR);
+
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("SSL error: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	conn->ssl_in_use = true;
+	return PGRES_POLLING_OK;
+}
+
+ssize_t
+pgtls_read(PGconn *conn, void *ptr, size_t len)
+{
+	PRInt32		nread;
+	PRErrorCode status;
+	int			read_errno = 0;
+
+	nread = PR_Recv(conn->pr_fd, ptr, len, 0, PR_INTERVAL_NO_WAIT);
+
+	/*
+	 * PR_Recv blocks until there is data to read or the timeout expires. Zero
+	 * is returned for closed connections, while -1 indicates an error within
+	 * the ongoing connection.
+	 */
+	if (nread == 0)
+	{
+		read_errno = ECONNRESET;
+		return -1;
+	}
+
+	if (nread == -1)
+	{
+		status = PR_GetError();
+
+		switch (status)
+		{
+			case PR_WOULD_BLOCK_ERROR:
+				read_errno = EINTR;
+				break;
+
+			case PR_IO_TIMEOUT_ERROR:
+				break;
+
+				/*
+				 * The error cases for PR_Recv are not documented, but can be
+				 * reverse engineered from _MD_unix_map_default_error() in the
+				 * NSPR code, defined in pr/src/md/unix/unix_errors.c.
+				 */
+			default:
+				printfPQExpBuffer(&conn->errorMessage,
+								  libpq_gettext("TLS read error: %s"),
+								  pg_SSLerrmessage(status));
+				break;
+		}
+	}
+
+	SOCK_ERRNO_SET(read_errno);
+	return (ssize_t) nread;
+}
+
+/*
+ * pgtls_read_pending
+ *		Check for the existence of data to be read.
+ *
+ * This is part of the PostgreSQL TLS backend API.
+ */
+bool
+pgtls_read_pending(PGconn *conn)
+{
+	unsigned char c;
+	int			n;
+
+	/*
+	 * PR_Recv peeks into the stream with the timeount turned off, to see if
+	 * there is another byte to read off the wire. There is an NSS function
+	 * SSL_DataPending() which might seem like a better fit, but it will only
+	 * check already encrypted data in the SSL buffer, not still unencrypted
+	 * data, thus it doesn't guarantee that a subsequent call to
+	 * PR_Read/PR_Recv wont block.
+	 */
+	n = PR_Recv(conn->pr_fd, &c, 1, PR_MSG_PEEK, PR_INTERVAL_NO_WAIT);
+	return (n > 0);
+}
+
+ssize_t
+pgtls_write(PGconn *conn, const void *ptr, size_t len)
+{
+	PRInt32		n;
+	PRErrorCode status;
+	int			write_errno = 0;
+
+	n = PR_Write(conn->pr_fd, ptr, len);
+
+	if (n < 0)
+	{
+		status = PR_GetError();
+
+		switch (status)
+		{
+			case PR_WOULD_BLOCK_ERROR:
+#ifdef EAGAIN
+				write_errno = EAGAIN;
+#else
+				write_errno = EINTR;
+#endif
+				break;
+
+			default:
+				printfPQExpBuffer(&conn->errorMessage,
+								  libpq_gettext("TLS write error: %s"),
+								  pg_SSLerrmessage(status));
+				write_errno = ECONNRESET;
+				break;
+		}
+	}
+
+	SOCK_ERRNO_SET(write_errno);
+	return (ssize_t) n;
+}
+
+/*
+ *	Verify that the server certificate matches the hostname we connected to.
+ *
+ * The certificate's Common Name and Subject Alternative Names are considered.
+ */
+int
+pgtls_verify_peer_name_matches_certificate_guts(PGconn *conn,
+												int *names_examined,
+												char **first_name)
+{
+	return 1;
+}
+
+/* ------------------------------------------------------------ */
+/*			PostgreSQL specific TLS support functions			*/
+/* ------------------------------------------------------------ */
+
+/*
+ * TODO: this a 99% copy of the same function in the backend, make these share
+ * a single implementation instead.
+ */
+static char *
+pg_SSLerrmessage(PRErrorCode errcode)
+{
+	const char *error;
+
+	error = PR_ErrorToName(errcode);
+	if (error)
+		return strdup(error);
+
+	return strdup("unknown TLS error");
+}
+
+static SECStatus
+pg_load_nss_module(SECMODModule * *module, const char *library, const char *name)
+{
+	SECMODModule *mod;
+	char	   *modulespec;
+
+	modulespec = psprintf("library=\"%s\", name=\"%s\"", library, name);
+
+	/*
+	 * Attempt to load the specified module. The second parameter is "parent"
+	 * which should always be NULL for application code. The third parameter
+	 * defines if loading should recurse which is only applicable when loading
+	 * a module from within another module. This hierarchy would have to be
+	 * defined in the modulespec, and since we don't support anything but
+	 * directly addressed modules we should pass PR_FALSE.
+	 */
+	mod = SECMOD_LoadUserModule(modulespec, NULL, PR_FALSE);
+	pfree(modulespec);
+
+	if (mod && mod->loaded)
+	{
+		*module = mod;
+		return SECSuccess;
+	}
+
+	SECMOD_DestroyModule(mod);
+	return SECFailure;
+}
+
+/* ------------------------------------------------------------ */
+/*						NSS Callbacks							*/
+/* ------------------------------------------------------------ */
+
+/*
+ * pg_cert_auth_handler
+ *			Callback for authenticating server certificate
+ *
+ * This is pretty much the same procedure as the SSL_AuthCertificate function
+ * provided by NSS, with the difference being server hostname validation. With
+ * SSL_AuthCertificate there is no way to do verify-ca, it only does the -full
+ * flavor of our sslmodes, so we need our own implementation.
+ */
+static SECStatus
+pg_cert_auth_handler(void *arg, PRFileDesc * fd, PRBool checksig, PRBool isServer)
+{
+	SECStatus	status;
+	PGconn	   *conn = (PGconn *) arg;
+	char	   *server_hostname = NULL;
+	CERTCertificate *server_cert;
+	void	   *pin;
+
+	Assert(!isServer);
+
+	pin = SSL_RevealPinArg(conn->pr_fd);
+	server_cert = SSL_PeerCertificate(conn->pr_fd);
+
+	status = CERT_VerifyCertificateNow((CERTCertDBHandle *) CERT_GetDefaultCertDB(), server_cert,
+									   checksig, certificateUsageSSLServer,
+									   pin, NULL);
+
+	/*
+	 * If we've already failed validation then there is no point in also
+	 * performing the hostname check for verify-full.
+	 */
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to verify certificate: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		goto done;
+	}
+
+	if (strcmp(conn->sslmode, "verify-full") == 0)
+	{
+		server_hostname = SSL_RevealURL(conn->pr_fd);
+		if (!server_hostname || server_hostname[0] == '\0')
+			goto done;
+
+		/*
+		 * CERT_VerifyCertName will internally perform RFC 2818 SubjectAltName
+		 * verification.
+		 */
+		status = CERT_VerifyCertName(server_cert, server_hostname);
+		if (status != SECSuccess)
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("unable to verify server hostname: %s"),
+							  pg_SSLerrmessage(PR_GetError()));
+
+	}
+
+done:
+	if (server_hostname)
+		PR_Free(server_hostname);
+
+	CERT_DestroyCertificate(server_cert);
+	return status;
+}
+
+/*
+ * pg_client_auth_handler
+ *		Callback for client certificate validation
+ *
+ * The client auth callback is not on by default in NSS, so we need to invoke
+ * it ourselves to ensure we can do cert authentication. A TODO is to support
+ * running without a specified sslcert parameter. By retrieving all the certs
+ * via nickname from the cert database and see if we find one which apply with
+ * NSS_CmpCertChainWCANames() and PK11_FindKeyByAnyCert() we could support
+ * just running with a ssl database specified.
+ *
+ * For now, we use the default client certificate validation which requires a
+ * defined nickname to identify the cert in the database.
+ */
+static SECStatus
+pg_client_auth_handler(void *arg, PRFileDesc * socket, CERTDistNames * caNames,
+					   CERTCertificate * *pRetCert, SECKEYPrivateKey * *pRetKey)
+{
+	PGconn	   *conn = (PGconn *) arg;
+
+	return NSS_GetClientAuthData(conn->sslcert, socket, caNames, pRetCert, pRetKey);
+}
+
+/*
+ * pg_bad_cert_handler
+ *		Callback for failed certificate validation
+ *
+ * The TLS handshake will call this function iff the server certificate failed
+ * validation. Depending on the sslmode, we allow the connection anyways.
+ */
+static SECStatus
+pg_bad_cert_handler(void *arg, PRFileDesc * fd)
+{
+	PGconn	   *conn = (PGconn *) arg;
+	PRErrorCode err;
+
+	/*
+	 * This really shouldn't happen, as we've the the PGconn object as our
+	 * callback data, and at the callsite we know it will be populated. That
+	 * being said, the NSS code itself performs this check even when it should
+	 * not be required so let's use the same belts with our suspenders.
+	 */
+	if (!arg)
+		return SECFailure;
+
+	/*
+	 * For sslmodes other than verify-full and verify-ca we don't perform peer
+	 * validation, so return immediately.  sslmode require with a database
+	 * specified which contains a CA certificate will work like verify-ca to
+	 * be compatible with the OpenSSL implementation.
+	 */
+	if (strcmp(conn->sslmode, "require") == 0)
+	{
+		if (conn->cert_database && strlen(conn->cert_database) > 0 && cert_database_has_CA(conn))
+			return SECFailure;
+	}
+	if (conn->sslmode[0] == 'v')
+		return SECFailure;
+
+	err = PORT_GetError();
+
+	/*
+	 * TODO: these are relevant error codes that can occur in certificate
+	 * validation, figure out which we dont want for require/prefer etc.
+	 */
+	switch (err)
+	{
+		case SEC_ERROR_INVALID_AVA:
+		case SEC_ERROR_INVALID_TIME:
+		case SEC_ERROR_BAD_SIGNATURE:
+		case SEC_ERROR_EXPIRED_CERTIFICATE:
+		case SEC_ERROR_UNKNOWN_ISSUER:
+		case SEC_ERROR_UNTRUSTED_ISSUER:
+		case SEC_ERROR_UNTRUSTED_CERT:
+		case SEC_ERROR_CERT_VALID:
+		case SEC_ERROR_EXPIRED_ISSUER_CERTIFICATE:
+		case SEC_ERROR_CRL_EXPIRED:
+		case SEC_ERROR_CRL_BAD_SIGNATURE:
+		case SEC_ERROR_EXTENSION_VALUE_INVALID:
+		case SEC_ERROR_CA_CERT_INVALID:
+		case SEC_ERROR_CERT_USAGES_INVALID:
+		case SEC_ERROR_UNKNOWN_CRITICAL_EXTENSION:
+			return SECSuccess;
+			break;
+		default:
+			return SECFailure;
+			break;
+	}
+
+	/* Unreachable */
+	return SECSuccess;
+}
+
+/* ------------------------------------------------------------ */
+/*					SSL information functions					*/
+/* ------------------------------------------------------------ */
+
+void *
+PQgetssl(PGconn *conn)
+{
+	/*
+	 * Always return NULL as this is legacy and defined to be equal to
+	 * PQsslStruct(conn, "OpenSSL"); This should ideally trigger a logged
+	 * warning somewhere as it's nonsensical to run in a non-OpenSSL build,
+	 * but the color of said bikeshed hasn't yet been determined.
+	 */
+	return NULL;
+}
+
+void *
+PQsslStruct(PGconn *conn, const char *struct_name)
+{
+	if (!conn)
+		return NULL;
+
+	/*
+	 * Return the underlying PRFileDesc which can be used to access
+	 * information on the connection details. There is no SSL context per se.
+	 */
+	if (strcmp(struct_name, "NSS") == 0)
+		return conn->pr_fd;
+	return NULL;
+}
+
+const char *const *
+PQsslAttributeNames(PGconn *conn)
+{
+	static const char *const result[] = {
+		"library",
+		"cipher",
+		"protocol",
+		"key_bits",
+		"compression",
+		NULL
+	};
+
+	return result;
+}
+
+const char *
+PQsslAttribute(PGconn *conn, const char *attribute_name)
+{
+	SECStatus	status;
+	SSLChannelInfo channel;
+	SSLCipherSuiteInfo suite;
+
+	if (!conn || !conn->pr_fd)
+		return NULL;
+
+	if (strcmp(attribute_name, "library") == 0)
+		return "NSS";
+
+	status = SSL_GetChannelInfo(conn->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+		return NULL;
+
+	status = SSL_GetCipherSuiteInfo(channel.cipherSuite, &suite, sizeof(suite));
+	if (status != SECSuccess)
+		return NULL;
+
+	if (strcmp(attribute_name, "cipher") == 0)
+		return suite.cipherSuiteName;
+
+	if (strcmp(attribute_name, "key_bits") == 0)
+	{
+		static char key_bits_str[8];
+
+		snprintf(key_bits_str, sizeof(key_bits_str), "%i", suite.effectiveKeyBits);
+		return key_bits_str;
+	}
+
+	if (strcmp(attribute_name, "protocol") == 0)
+	{
+		switch (channel.protocolVersion)
+		{
+#ifdef SSL_LIBRARY_VERSION_TLS_1_3
+			case SSL_LIBRARY_VERSION_TLS_1_3:
+				return "TLSv1.3";
+#endif
+#ifdef SSL_LIBRARY_VERSION_TLS_1_2
+			case SSL_LIBRARY_VERSION_TLS_1_2:
+				return "TLSv1.2";
+#endif
+#ifdef SSL_LIBRARY_VERSION_TLS_1_1
+			case SSL_LIBRARY_VERSION_TLS_1_1:
+				return "TLSv1.1";
+#endif
+			case SSL_LIBRARY_VERSION_TLS_1_0:
+				return "TLSv1.0";
+			default:
+				return "unknown";
+		}
+	}
+
+	/*
+	 * NSS disabled support for compression in version 3.33, and it was only
+	 * available for SSLv3 at that point anyways, so we can safely return off
+	 * here without checking.
+	 */
+	if (strcmp(attribute_name, "compression") == 0)
+		return "off";
+
+	return NULL;
+}
+
+static int
+ssl_protocol_version_to_nss(const char *protocol)
+{
+	if (pg_strcasecmp("TLSv1", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_0;
+
+#ifdef SSL_LIBRARY_VERSION_TLS_1_1
+	if (pg_strcasecmp("TLSv1.1", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_1;
+#endif
+
+#ifdef SSL_LIBRARY_VERSION_TLS_1_2
+	if (pg_strcasecmp("TLSv1.2", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_2;
+#endif
+
+#ifdef SSL_LIBRARY_VERSION_TLS_1_3
+	if (pg_strcasecmp("TLSv1.3", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_3;
+#endif
+
+	return -1;
+}
+
+static bool
+cert_database_has_CA(PGconn *conn)
+{
+	CERTCertList *certificates;
+	bool		hasCA;
+
+	/*
+	 * If the certificate database has a password we must provide it, since
+	 * this API doesn't invoke the standard password callback.
+	 */
+	if (has_password)
+		certificates = PK11_ListCerts(PK11CertListCA, PQssl_passwd_cb(NULL, PR_FALSE, (void *) conn));
+	else
+		certificates = PK11_ListCerts(PK11CertListCA, NULL);
+	hasCA = !CERT_LIST_EMPTY(certificates);
+	CERT_DestroyCertList(certificates);
+
+	return hasCA;
+}
+
+PQsslKeyPassHook_nss_type
+PQgetSSLKeyPassHook_nss(void)
+{
+	return PQsslKeyPassHook;
+}
+
+void
+PQsetSSLKeyPassHook_nss(PQsslKeyPassHook_nss_type hook)
+{
+	PQsslKeyPassHook = hook;
+}
+
+/*
+ * Supply a password to decrypt a client certificate.
+ *
+ * This must match NSS type PK11PasswordFunc.
+ */
+static char *
+PQssl_passwd_cb(PK11SlotInfo * slot, PRBool retry, void *arg)
+{
+	has_password = true;
+
+	if (PQsslKeyPassHook)
+		return PQsslKeyPassHook(slot, (PRBool) retry, arg);
+	else
+		return PQdefaultSSLKeyPassHook_nss(slot, retry, arg);
+}
+
+/*
+ * The default password handler callback.
+ */
+char *
+PQdefaultSSLKeyPassHook_nss(PK11SlotInfo * slot, PRBool retry, void *arg)
+{
+	PGconn	   *conn = (PGconn *) arg;
+
+	/*
+	 * If the password didn't work the first time there is no point in
+	 * retrying as it hasn't changed.
+	 */
+	if (retry != PR_TRUE && conn->sslpassword && strlen(conn->sslpassword) > 0)
+		return PORT_Strdup(conn->sslpassword);
+
+	return NULL;
+}
diff --git a/src/interfaces/libpq/fe-secure.c b/src/interfaces/libpq/fe-secure.c
index 3311fd7a5b..b6c92ece11 100644
--- a/src/interfaces/libpq/fe-secure.c
+++ b/src/interfaces/libpq/fe-secure.c
@@ -430,6 +430,9 @@ PQsslAttributeNames(PGconn *conn)
 
 	return result;
 }
+#endif /* USE_SSL */
+
+#ifndef USE_OPENSSL
 
 PQsslKeyPassHook_OpenSSL_type
 PQgetSSLKeyPassHook_OpenSSL(void)
@@ -448,7 +451,7 @@ PQdefaultSSLKeyPassHook_OpenSSL(char *buf, int size, PGconn *conn)
 {
 	return 0;
 }
-#endif							/* USE_SSL */
+#endif							/* USE_OPENSSL */
 
 /* Dummy version of GSSAPI information functions, when built without GSS support */
 #ifndef ENABLE_GSS
diff --git a/src/interfaces/libpq/libpq-fe.h b/src/interfaces/libpq/libpq-fe.h
index 3b6a9fbce3..27c16e187f 100644
--- a/src/interfaces/libpq/libpq-fe.h
+++ b/src/interfaces/libpq/libpq-fe.h
@@ -625,6 +625,17 @@ extern PQsslKeyPassHook_OpenSSL_type PQgetSSLKeyPassHook_OpenSSL(void);
 extern void PQsetSSLKeyPassHook_OpenSSL(PQsslKeyPassHook_OpenSSL_type hook);
 extern int	PQdefaultSSLKeyPassHook_OpenSSL(char *buf, int size, PGconn *conn);
 
+/* == in fe-secure-nss.c === */
+typedef struct PK11SlotInfoStr PK11SlotInfo;
+typedef int PRIntn;
+typedef PRIntn PRBool;
+
+/* Support for overriding sslpassword handling with a callback. */
+typedef char *(*PQsslKeyPassHook_nss_type) (PK11SlotInfo * slot, PRBool retry, void *arg);
+extern PQsslKeyPassHook_nss_type PQgetSSLKeyPassHook_nss(void);
+extern void PQsetSSLKeyPassHook_nss(PQsslKeyPassHook_nss_type hook);
+extern char *PQdefaultSSLKeyPassHook_nss(PK11SlotInfo * slot, PRBool retry, void *arg);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/src/interfaces/libpq/libpq-int.h b/src/interfaces/libpq/libpq-int.h
index 1de91ae295..12717ca720 100644
--- a/src/interfaces/libpq/libpq-int.h
+++ b/src/interfaces/libpq/libpq-int.h
@@ -362,6 +362,7 @@ struct pg_conn
 	char	   *sslpassword;	/* client key file password */
 	char	   *sslrootcert;	/* root certificate filename */
 	char	   *sslcrl;			/* certificate revocation list filename */
+	char	   *cert_database;
 	char	   *requirepeer;	/* required peer credentials for local sockets */
 	char	   *gssencmode;		/* GSS mode (require,prefer,disable) */
 	char	   *krbsrvname;		/* Kerberos service name */
@@ -485,6 +486,10 @@ struct pg_conn
 								 * OpenSSL version changes */
 #endif
 #endif							/* USE_OPENSSL */
+
+#ifdef USE_NSS
+	void	   *pr_fd;
+#endif							/* USE_NSS */
 #endif							/* USE_SSL */
 
 #ifdef ENABLE_GSS
diff --git a/src/test/Makefile b/src/test/Makefile
index efb206aa75..d18f5a083b 100644
--- a/src/test/Makefile
+++ b/src/test/Makefile
@@ -27,7 +27,7 @@ ifneq (,$(filter ldap,$(PG_TEST_EXTRA)))
 SUBDIRS += ldap
 endif
 endif
-ifeq ($(with_openssl),yes)
+ifeq ($(with_ssl),yes)
 ifneq (,$(filter ssl,$(PG_TEST_EXTRA)))
 SUBDIRS += ssl
 endif
diff --git a/src/test/ssl/Makefile b/src/test/ssl/Makefile
index 777ee39413..fe265e2dbd 100644
--- a/src/test/ssl/Makefile
+++ b/src/test/ssl/Makefile
@@ -14,6 +14,7 @@ top_builddir = ../../..
 include $(top_builddir)/src/Makefile.global
 
 export with_openssl
+export with_nss
 
 CERTIFICATES := server_ca server-cn-and-alt-names \
 	server-cn-only server-single-alt-name server-multiple-alt-names \
@@ -30,6 +31,32 @@ SSLFILES := $(CERTIFICATES:%=ssl/%.key) $(CERTIFICATES:%=ssl/%.crt) \
 	ssl/client+client_ca.crt ssl/client-der.key \
 	ssl/client-encrypted-pem.key ssl/client-encrypted-der.key
 
+# Even though we in practice could get away with far fewer NSS databases, they
+# are generated to mimick the setup for the OpenSSL tests in order to ensure
+# we isolate the same behavior between the backends. The database name should
+# contain the files included for easier test suite code reading.
+NSSFILES := ssl/nss/client_ca.crt.db \
+	ssl/nss/server_ca.crt.db \
+	ssl/nss/root+server_ca.crt.db \
+	ssl/nss/root+client_ca.crt.db \
+	ssl/nss/client.crt__client.key.db \
+	ssl/nss/client-revoked.crt__client-revoked.key.db \
+	ssl/nss/server-cn-only.crt__server-password.key.db \
+	ssl/nss/server-cn-only.crt__server-cn-only.key.db \
+	ssl/nss/root.crl \
+	ssl/nss/server.crl \
+	ssl/nss/client.crl \
+	ssl/nss/server-multiple-alt-names.crt__server-multiple-alt-names.key.db \
+	ssl/nss/server-single-alt-name.crt__server-single-alt-name.key.db \
+	ssl/nss/server-cn-and-alt-names.crt__server-cn-and-alt-names.key.db \
+	ssl/nss/server-no-names.crt__server-no-names.key.db \
+	ssl/nss/server-revoked.crt__server-revoked.key.db \
+	ssl/nss/root+client.crl \
+	ssl/nss/client+client_ca.crt__client.key.db \
+	ssl/nss/client.crt__client-encrypted-pem.key.db \
+	ssl/nss/root+server_ca.crt__server.crl.db \
+	ssl/nss/root+server_ca.crt__root+server.crl.db
+
 # This target re-generates all the key and certificate files. Usually we just
 # use the ones that are committed to the tree without rebuilding them.
 #
@@ -37,6 +64,10 @@ SSLFILES := $(CERTIFICATES:%=ssl/%.key) $(CERTIFICATES:%=ssl/%.crt) \
 #
 sslfiles: $(SSLFILES)
 
+# Generate NSS certificate databases corresponding to the OpenSSL certificates.
+# This target will fail unless preceded by nssfiles-clean.
+nssfiles: $(NSSFILES)
+
 # OpenSSL requires a directory to put all generated certificates in. We don't
 # use this for anything, but we need a location.
 ssl/new_certs_dir:
@@ -64,6 +95,24 @@ ssl/%_ca.crt: ssl/%_ca.key %_ca.config ssl/root_ca.crt ssl/new_certs_dir
 	rm ssl/temp_ca.crt ssl/temp_ca_signed.crt
 	echo "01" > ssl/$*_ca.srl
 
+ssl/nss/%_ca.crt.db: ssl/%_ca.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n $*_ca.crt -i ssl/$*_ca.crt -t "CT,C,C"
+
+ssl/nss/root+server_ca.crt__server.crl.db: ssl/root+server_ca.crt ssl/nss/server.crl
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	crlutil -I -i ssl/nss/server.crl -d $@ -B
+
+ssl/nss/root+server_ca.crt__root+server.crl.db: ssl/root+server_ca.crt ssl/nss/root.crl ssl/nss/server.crl
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	crlutil -I -i ssl/nss/root.crl -d $@ -B
+	crlutil -I -i ssl/nss/server.crl -d $@ -B
+
 # Server certificates, signed by server CA:
 ssl/server-%.crt: ssl/server-%.key ssl/server_ca.crt server-%.config
 	openssl req -new -key ssl/server-$*.key -out ssl/server-$*.csr -config server-$*.config
@@ -77,6 +126,74 @@ ssl/server-ss.crt: ssl/server-cn-only.key ssl/server-cn-only.crt server-cn-only.
 	openssl x509 -req -days 10000 -in ssl/server-ss.csr -signkey ssl/server-cn-only.key -out ssl/server-ss.crt  -extensions v3_req -extfile server-cn-only.config
 	rm ssl/server-ss.csr
 
+ssl/nss/server-cn-only.crt__server-password.key.db: ssl/server-cn-only.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-cn-only.crt -i ssl/server-cn-only.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-password.pfx -inkey ssl/server-password.key -in ssl/server-cn-only.crt -certfile ssl/server_ca.crt -passin 'pass:secret1' -passout pass:
+	pk12util -i ssl/nss/server-password.pfx -d $@ -W ''
+
+ssl/nss/server-cn-only.crt__server-cn-only.key.db: ssl/server-cn-only.crt ssl/server-cn-only.key
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-cn-only.crt -i ssl/server-cn-only.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-cn-only.pfx -inkey ssl/server-cn-only.key -in ssl/server-cn-only.crt -certfile ssl/server_ca.crt -passout pass:
+	pk12util -i ssl/nss/server-cn-only.pfx -d $@ -W ''
+
+ssl/nss/server-multiple-alt-names.crt__server-multiple-alt-names.key.db: ssl/server-multiple-alt-names.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-multiple-alt-names.crt -i ssl/server-multiple-alt-names.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-multiple-alt-names.pfx -inkey ssl/server-multiple-alt-names.key -in ssl/server-multiple-alt-names.crt -certfile ssl/server-multiple-alt-names.crt -passout pass:
+	pk12util -i ssl/nss/server-multiple-alt-names.pfx -d $@ -W ''
+
+ssl/nss/server-single-alt-name.crt__server-single-alt-name.key.db: ssl/server-single-alt-name.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-single-alt-name.crt -i ssl/server-single-alt-name.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-single-alt-name.pfx -inkey ssl/server-single-alt-name.key -in ssl/server-single-alt-name.crt -certfile ssl/server-single-alt-name.crt -passout pass:
+	pk12util -i ssl/nss/server-single-alt-name.pfx -d $@ -W ''
+
+ssl/nss/server-cn-and-alt-names.crt__server-cn-and-alt-names.key.db: ssl/server-cn-and-alt-names.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-cn-and-alt-names.crt -i ssl/server-cn-and-alt-names.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-cn-and-alt-names.pfx -inkey ssl/server-cn-and-alt-names.key -in ssl/server-cn-and-alt-names.crt -certfile ssl/server-cn-and-alt-names.crt -passout pass:
+	pk12util -i ssl/nss/server-cn-and-alt-names.pfx -d $@ -W ''
+
+ssl/nss/server-no-names.crt__server-no-names.key.db: ssl/server-no-names.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-no-names.crt -i ssl/server-no-names.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-no-names.pfx -inkey ssl/server-no-names.key -in ssl/server-no-names.crt -certfile ssl/server-no-names.crt -passout pass:
+	pk12util -i ssl/nss/server-no-names.pfx -d $@ -W ''
+
+ssl/nss/server-revoked.crt__server-revoked.key.db: ssl/server-revoked.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-revoked.crt -i ssl/server-revoked.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-revoked.pfx -inkey ssl/server-revoked.key -in ssl/server-revoked.crt -certfile ssl/server-revoked.crt -passout pass:
+	pk12util -i ssl/nss/server-revoked.pfx -d $@ -W ''
+
 # Password-protected version of server-cn-only.key
 ssl/server-password.key: ssl/server-cn-only.key
 	openssl rsa -aes256 -in $< -out $@ -passout 'pass:secret1'
@@ -88,6 +205,27 @@ ssl/client.crt: ssl/client.key ssl/client_ca.crt
 	openssl x509 -in ssl/temp.crt -out ssl/client.crt # to keep just the PEM cert
 	rm ssl/client.csr ssl/temp.crt
 
+# Client certificate, signed by client CA
+ssl/nss/client.crt__client.key.db: ssl/client.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/client.crt -i ssl/client.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root+client_ca.crt -i ssl/root+client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client.pfx -inkey ssl/client.key -in ssl/client.crt -certfile ssl/client_ca.crt -passout pass:
+	pk12util -i ssl/nss/client.pfx -d $@ -W ''
+
+# Client certificate with encrypted key, signed by client CA
+ssl/nss/client.crt__client-encrypted-pem.key.db: ssl/client.crt
+	$(MKDIR_P) $@
+	echo 'dUmmyP^#+' > $@.pass
+	certutil -d "sql:$@" -N -f $@.pass
+	certutil -d "sql:$@" -A -f $@.pass -n ssl/client.crt -i ssl/client.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -f $@.pass -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -f $@.pass -n root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client-encrypted-pem.pfx -inkey ssl/client-encrypted-pem.key -in ssl/client.crt -certfile ssl/client_ca.crt -passin pass:'dUmmyP^#+' -passout pass:'dUmmyP^#+'
+	pk12util -i ssl/nss/client-encrypted-pem.pfx -d $@ -W 'dUmmyP^#+' -k $@.pass
+
 # Another client certificate, signed by the client CA. This one is revoked.
 ssl/client-revoked.crt: ssl/client-revoked.key ssl/client_ca.crt client.config
 	openssl req -new -key ssl/client-revoked.key -out ssl/client-revoked.csr -config client.config
@@ -95,6 +233,14 @@ ssl/client-revoked.crt: ssl/client-revoked.key ssl/client_ca.crt client.config
 	openssl x509 -in ssl/temp.crt -out ssl/client-revoked.crt # to keep just the PEM cert
 	rm ssl/client-revoked.csr ssl/temp.crt
 
+ssl/nss/client-revoked.crt__client-revoked.key.db: ssl/client-revoked.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/client-revoked.crt -i ssl/client-revoked.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client-revoked.pfx -inkey ssl/client-revoked.key -in ssl/client-revoked.crt -certfile ssl/client_ca.crt -passout pass:
+	pk12util -i ssl/nss/client-revoked.pfx -d $@ -W ''
+
 # Convert the key to DER, to test our behaviour there too
 ssl/client-der.key: ssl/client.key
 	openssl rsa -in ssl/client.key -outform DER -out ssl/client-der.key
@@ -127,19 +273,40 @@ ssl/root+client_ca.crt: ssl/root_ca.crt ssl/client_ca.crt
 ssl/client+client_ca.crt: ssl/client.crt ssl/client_ca.crt
 	cat $^ > $@
 
+# Client certificate, signed by client CA
+ssl/nss/client+client_ca.crt__client.key.db: ssl/client+client_ca.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/client+client_ca.crt -i ssl/client+client_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n ssl/root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client.pfx -inkey ssl/client.key -in ssl/client.crt -certfile ssl/client_ca.crt -passout pass:
+	pk12util -i ssl/nss/client.pfx -d $@ -W ''
+
 #### CRLs
 
 ssl/client.crl: ssl/client-revoked.crt
 	openssl ca -config cas.config -name client_ca -revoke ssl/client-revoked.crt
 	openssl ca -config cas.config -name client_ca -gencrl -out ssl/client.crl
 
+ssl/nss/client.crl: ssl/client.crl
+	openssl crl -in $^ -outform der -out $@
+
 ssl/server.crl: ssl/server-revoked.crt
 	openssl ca -config cas.config -name server_ca -revoke ssl/server-revoked.crt
 	openssl ca -config cas.config -name server_ca -gencrl -out ssl/server.crl
 
+ssl/nss/server.crl: ssl/server.crl
+	openssl crl -in $^ -outform der -out $@
+
 ssl/root.crl: ssl/root_ca.crt
 	openssl ca -config cas.config -name root_ca -gencrl -out ssl/root.crl
 
+ssl/nss/root.crl: ssl/root.crl
+	openssl crl -in $^ -outform der -out $@
+
+ssl/nss/root+client.crl: ssl/root+client.crl
+	openssl crl -in $^ -outform der -out $@
+
 # If a CRL is used, OpenSSL requires a CRL file for *all* the CAs in the
 # chain, even if some of them are empty.
 ssl/root+server.crl: ssl/root.crl ssl/server.crl
@@ -151,9 +318,14 @@ ssl/root+client.crl: ssl/root.crl ssl/client.crl
 sslfiles-clean:
 	rm -f $(SSLFILES) ssl/client_ca.srl ssl/server_ca.srl ssl/client_ca-certindex* ssl/server_ca-certindex* ssl/root_ca-certindex* ssl/root_ca.srl ssl/temp_ca.crt ssl/temp_ca_signed.crt
 
+.PHONY: nssfiles-clean
+nssfiles-clean:
+	rm -rf ssl/nss
+
 clean distclean maintainer-clean:
 	rm -rf tmp_check
 	rm -rf ssl/*.old ssl/new_certs_dir ssl/client*_tmp.key
+	rm -rf ssl/nss
 
 # Doesn't depend on $(SSLFILES) because we don't rebuild them by default
 check:
diff --git a/src/test/ssl/ssl/nss/client+client_ca.crt__client.key.db/cert9.db b/src/test/ssl/ssl/nss/client+client_ca.crt__client.key.db/cert9.db
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diff --git a/src/test/ssl/ssl/nss/client+client_ca.crt__client.key.db/key4.db b/src/test/ssl/ssl/nss/client+client_ca.crt__client.key.db/key4.db
new file mode 100644
index 0000000000000000000000000000000000000000..2a6cb5d9248a87e322d39172bd495eb428b2a035
GIT binary patch
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literal 0
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diff --git a/src/test/ssl/ssl/nss/client+client_ca.crt__client.key.db/pkcs11.txt b/src/test/ssl/ssl/nss/client+client_ca.crt__client.key.db/pkcs11.txt
new file mode 100644
index 0000000000..dfffe92b90
--- /dev/null
+++ b/src/test/ssl/ssl/nss/client+client_ca.crt__client.key.db/pkcs11.txt
@@ -0,0 +1,5 @@
+library=
+name=NSS Internal PKCS #11 Module
+parameters=configdir='sql:ssl/nss/client+client_ca.crt__client.key.db' certPrefix='' keyPrefix='' secmod='secmod.db' flags= updatedir='' updateCertPrefix='' updateKeyPrefix='' updateid='' updateTokenDescription='' 
+NSS=Flags=internal,critical trustOrder=75 cipherOrder=100 slotParams=(1={slotFlags=[ECC,RSA,DSA,DH,RC2,RC4,DES,RANDOM,SHA1,MD5,MD2,SSL,TLS,AES,Camellia,SEED,SHA256,SHA512] askpw=any timeout=30})
+
diff --git a/src/test/ssl/ssl/nss/client-encrypted-pem.pfx b/src/test/ssl/ssl/nss/client-encrypted-pem.pfx
new file mode 100644
index 0000000000000000000000000000000000000000..940af9f2967aeb1d3be1c41db6cb2d1e21c757ba
GIT binary patch
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new file mode 100644
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diff --git a/src/test/ssl/ssl/nss/client-revoked.crt__client-revoked.key.db/pkcs11.txt b/src/test/ssl/ssl/nss/client-revoked.crt__client-revoked.key.db/pkcs11.txt
new file mode 100644
index 0000000000..67ce598fd3
--- /dev/null
+++ b/src/test/ssl/ssl/nss/client-revoked.crt__client-revoked.key.db/pkcs11.txt
@@ -0,0 +1,5 @@
+library=
+name=NSS Internal PKCS #11 Module
+parameters=configdir='sql:ssl/nss/client-revoked.crt__client-revoked.key.db' certPrefix='' keyPrefix='' secmod='secmod.db' flags= updatedir='' updateCertPrefix='' updateKeyPrefix='' updateid='' updateTokenDescription='' 
+NSS=Flags=internal,critical trustOrder=75 cipherOrder=100 slotParams=(1={slotFlags=[ECC,RSA,DSA,DH,RC2,RC4,DES,RANDOM,SHA1,MD5,MD2,SSL,TLS,AES,Camellia,SEED,SHA256,SHA512] askpw=any timeout=30})
+
diff --git a/src/test/ssl/ssl/nss/client-revoked.pfx b/src/test/ssl/ssl/nss/client-revoked.pfx
new file mode 100644
index 0000000000000000000000000000000000000000..2ab711880535eb3cec99c033365797487765f042
GIT binary patch
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diff --git a/src/test/ssl/ssl/nss/client.crl b/src/test/ssl/ssl/nss/client.crl
new file mode 100644
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GIT binary patch
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literal 0
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diff --git a/src/test/ssl/ssl/nss/client.crt__client-encrypted-pem.key.db.pass b/src/test/ssl/ssl/nss/client.crt__client-encrypted-pem.key.db.pass
new file mode 100644
index 0000000000..3ac5759692
--- /dev/null
+++ b/src/test/ssl/ssl/nss/client.crt__client-encrypted-pem.key.db.pass
@@ -0,0 +1 @@
+dUmmyP^#+
diff --git a/src/test/ssl/ssl/nss/client.crt__client-encrypted-pem.key.db/cert9.db b/src/test/ssl/ssl/nss/client.crt__client-encrypted-pem.key.db/cert9.db
new file mode 100644
index 0000000000000000000000000000000000000000..2a50e21d0e379f2b24547cf52127b06329c6bd67
GIT binary patch
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diff --git a/src/test/ssl/ssl/nss/client.crt__client-encrypted-pem.key.db/key4.db b/src/test/ssl/ssl/nss/client.crt__client-encrypted-pem.key.db/key4.db
new file mode 100644
index 0000000000000000000000000000000000000000..3884ab59f5568f08e5c65bd753fe7a24c4bb2ae7
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diff --git a/src/test/ssl/ssl/nss/client.crt__client-encrypted-pem.key.db/pkcs11.txt b/src/test/ssl/ssl/nss/client.crt__client-encrypted-pem.key.db/pkcs11.txt
new file mode 100644
index 0000000000..190f880c0a
--- /dev/null
+++ b/src/test/ssl/ssl/nss/client.crt__client-encrypted-pem.key.db/pkcs11.txt
@@ -0,0 +1,5 @@
+library=
+name=NSS Internal PKCS #11 Module
+parameters=configdir='sql:ssl/nss/client.crt__client-encrypted-pem.key.db' certPrefix='' keyPrefix='' secmod='secmod.db' flags= updatedir='' updateCertPrefix='' updateKeyPrefix='' updateid='' updateTokenDescription='' 
+NSS=Flags=internal,critical trustOrder=75 cipherOrder=100 slotParams=(1={slotFlags=[ECC,RSA,DSA,DH,RC2,RC4,DES,RANDOM,SHA1,MD5,MD2,SSL,TLS,AES,Camellia,SEED,SHA256,SHA512] askpw=any timeout=30})
+
diff --git a/src/test/ssl/ssl/nss/client.crt__client.key.db/cert9.db b/src/test/ssl/ssl/nss/client.crt__client.key.db/cert9.db
new file mode 100644
index 0000000000000000000000000000000000000000..96ef52b347114a4403c97567215841487f8d9d29
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diff --git a/src/test/ssl/ssl/nss/client.crt__client.key.db/key4.db b/src/test/ssl/ssl/nss/client.crt__client.key.db/key4.db
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diff --git a/src/test/ssl/ssl/nss/client.crt__client.key.db/pkcs11.txt b/src/test/ssl/ssl/nss/client.crt__client.key.db/pkcs11.txt
new file mode 100644
index 0000000000..3f0a9ff5b5
--- /dev/null
+++ b/src/test/ssl/ssl/nss/client.crt__client.key.db/pkcs11.txt
@@ -0,0 +1,5 @@
+library=
+name=NSS Internal PKCS #11 Module
+parameters=configdir='sql:ssl/nss/client.crt__client.key.db' certPrefix='' keyPrefix='' secmod='secmod.db' flags= updatedir='' updateCertPrefix='' updateKeyPrefix='' updateid='' updateTokenDescription='' 
+NSS=Flags=internal,critical trustOrder=75 cipherOrder=100 slotParams=(1={slotFlags=[ECC,RSA,DSA,DH,RC2,RC4,DES,RANDOM,SHA1,MD5,MD2,SSL,TLS,AES,Camellia,SEED,SHA256,SHA512] askpw=any timeout=30})
+
diff --git a/src/test/ssl/ssl/nss/client.pfx b/src/test/ssl/ssl/nss/client.pfx
new file mode 100644
index 0000000000000000000000000000000000000000..ba13f0cafff3a3d64ab5c1b26e98033614e71fcb
GIT binary patch
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diff --git a/src/test/ssl/ssl/nss/client_ca.crt.db/cert9.db b/src/test/ssl/ssl/nss/client_ca.crt.db/cert9.db
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index 0000000000000000000000000000000000000000..e0a8a94d56e8c8fae91d40d6c67ba5778f0e122a
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diff --git a/src/test/ssl/ssl/nss/client_ca.crt.db/key4.db b/src/test/ssl/ssl/nss/client_ca.crt.db/key4.db
new file mode 100644
index 0000000000000000000000000000000000000000..5793b879513b18bb5467717532e575556422341a
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diff --git a/src/test/ssl/ssl/nss/client_ca.crt.db/pkcs11.txt b/src/test/ssl/ssl/nss/client_ca.crt.db/pkcs11.txt
new file mode 100644
index 0000000000..212e72edeb
--- /dev/null
+++ b/src/test/ssl/ssl/nss/client_ca.crt.db/pkcs11.txt
@@ -0,0 +1,5 @@
+library=
+name=NSS Internal PKCS #11 Module
+parameters=configdir='sql:ssl/nss/client_ca.crt.db' certPrefix='' keyPrefix='' secmod='secmod.db' flags= updatedir='' updateCertPrefix='' updateKeyPrefix='' updateid='' updateTokenDescription='' 
+NSS=Flags=internal,critical trustOrder=75 cipherOrder=100 slotParams=(1={slotFlags=[ECC,RSA,DSA,DH,RC2,RC4,DES,RANDOM,SHA1,MD5,MD2,SSL,TLS,AES,Camellia,SEED,SHA256,SHA512] askpw=any timeout=30})
+
diff --git a/src/test/ssl/ssl/nss/root+client.crl b/src/test/ssl/ssl/nss/root+client.crl
new file mode 100644
index 0000000000000000000000000000000000000000..1d345a098f4488bc747deaa0ef788d7168beb7c7
GIT binary patch
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literal 0
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diff --git a/src/test/ssl/ssl/nss/root+client_ca.crt.db/cert9.db b/src/test/ssl/ssl/nss/root+client_ca.crt.db/cert9.db
new file mode 100644
index 0000000000000000000000000000000000000000..54a75ba497fed1145ef8b0987417e5de6449496a
GIT binary patch
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diff --git a/src/test/ssl/ssl/nss/root+client_ca.crt.db/key4.db b/src/test/ssl/ssl/nss/root+client_ca.crt.db/key4.db
new file mode 100644
index 0000000000000000000000000000000000000000..55494e66c0b0aae452fa1e58ff6daa0ee72341f1
GIT binary patch
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literal 0
HcmV?d00001

diff --git a/src/test/ssl/ssl/nss/root+client_ca.crt.db/pkcs11.txt b/src/test/ssl/ssl/nss/root+client_ca.crt.db/pkcs11.txt
new file mode 100644
index 0000000000..bdbedc732b
--- /dev/null
+++ b/src/test/ssl/ssl/nss/root+client_ca.crt.db/pkcs11.txt
@@ -0,0 +1,5 @@
+library=
+name=NSS Internal PKCS #11 Module
+parameters=configdir='sql:ssl/nss/root+client_ca.crt.db' certPrefix='' keyPrefix='' secmod='secmod.db' flags= updatedir='' updateCertPrefix='' updateKeyPrefix='' updateid='' updateTokenDescription='' 
+NSS=Flags=internal,critical trustOrder=75 cipherOrder=100 slotParams=(1={slotFlags=[ECC,RSA,DSA,DH,RC2,RC4,DES,RANDOM,SHA1,MD5,MD2,SSL,TLS,AES,Camellia,SEED,SHA256,SHA512] askpw=any timeout=30})
+
diff --git a/src/test/ssl/ssl/nss/root+server_ca.crt.db/cert9.db b/src/test/ssl/ssl/nss/root+server_ca.crt.db/cert9.db
new file mode 100644
index 0000000000000000000000000000000000000000..faf4480a51f08ed862464fc42753d1002c886912
GIT binary patch
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literal 0
HcmV?d00001

diff --git a/src/test/ssl/ssl/nss/root+server_ca.crt.db/key4.db b/src/test/ssl/ssl/nss/root+server_ca.crt.db/key4.db
new file mode 100644
index 0000000000000000000000000000000000000000..391fefa234b49726959a94205089a04167c44fb7
GIT binary patch
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literal 0
HcmV?d00001

diff --git a/src/test/ssl/ssl/nss/root+server_ca.crt.db/pkcs11.txt b/src/test/ssl/ssl/nss/root+server_ca.crt.db/pkcs11.txt
new file mode 100644
index 0000000000..5d04ea23ce
--- /dev/null
+++ b/src/test/ssl/ssl/nss/root+server_ca.crt.db/pkcs11.txt
@@ -0,0 +1,5 @@
+library=
+name=NSS Internal PKCS #11 Module
+parameters=configdir='sql:ssl/nss/root+server_ca.crt.db' certPrefix='' keyPrefix='' secmod='secmod.db' flags= updatedir='' updateCertPrefix='' updateKeyPrefix='' updateid='' updateTokenDescription='' 
+NSS=Flags=internal,critical trustOrder=75 cipherOrder=100 slotParams=(1={slotFlags=[ECC,RSA,DSA,DH,RC2,RC4,DES,RANDOM,SHA1,MD5,MD2,SSL,TLS,AES,Camellia,SEED,SHA256,SHA512] askpw=any timeout=30})
+
diff --git a/src/test/ssl/ssl/nss/root+server_ca.crt__root+server.crl.db/cert9.db b/src/test/ssl/ssl/nss/root+server_ca.crt__root+server.crl.db/cert9.db
new file mode 100644
index 0000000000000000000000000000000000000000..1bef7b32e1a48253dcded78d36eb0a22062511fb
GIT binary patch
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diff --git a/src/test/ssl/ssl/nss/root+server_ca.crt__root+server.crl.db/key4.db b/src/test/ssl/ssl/nss/root+server_ca.crt__root+server.crl.db/key4.db
new file mode 100644
index 0000000000000000000000000000000000000000..633f26005c9734b998e0ec8ec699cc1c0164be48
GIT binary patch
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diff --git a/src/test/ssl/ssl/nss/root+server_ca.crt__root+server.crl.db/pkcs11.txt b/src/test/ssl/ssl/nss/root+server_ca.crt__root+server.crl.db/pkcs11.txt
new file mode 100644
index 0000000000..9e34f7d8ea
--- /dev/null
+++ b/src/test/ssl/ssl/nss/root+server_ca.crt__root+server.crl.db/pkcs11.txt
@@ -0,0 +1,5 @@
+library=
+name=NSS Internal PKCS #11 Module
+parameters=configdir='sql:ssl/nss/root+server_ca.crt__root+server.crl.db' certPrefix='' keyPrefix='' secmod='secmod.db' flags= updatedir='' updateCertPrefix='' updateKeyPrefix='' updateid='' updateTokenDescription='' 
+NSS=Flags=internal,critical trustOrder=75 cipherOrder=100 slotParams=(1={slotFlags=[ECC,RSA,DSA,DH,RC2,RC4,DES,RANDOM,SHA1,MD5,MD2,SSL,TLS,AES,Camellia,SEED,SHA256,SHA512] askpw=any timeout=30})
+
diff --git a/src/test/ssl/ssl/nss/root+server_ca.crt__server.crl.db/cert9.db b/src/test/ssl/ssl/nss/root+server_ca.crt__server.crl.db/cert9.db
new file mode 100644
index 0000000000000000000000000000000000000000..6dcb06f709163abaa8ff8779475330009cb10925
GIT binary patch
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diff --git a/src/test/ssl/ssl/nss/root+server_ca.crt__server.crl.db/key4.db b/src/test/ssl/ssl/nss/root+server_ca.crt__server.crl.db/key4.db
new file mode 100644
index 0000000000000000000000000000000000000000..572042e848fb394849dfc9a4aae5f811603ca074
GIT binary patch
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diff --git a/src/test/ssl/ssl/nss/root+server_ca.crt__server.crl.db/pkcs11.txt b/src/test/ssl/ssl/nss/root+server_ca.crt__server.crl.db/pkcs11.txt
new file mode 100644
index 0000000000..b54121fc4e
--- /dev/null
+++ b/src/test/ssl/ssl/nss/root+server_ca.crt__server.crl.db/pkcs11.txt
@@ -0,0 +1,5 @@
+library=
+name=NSS Internal PKCS #11 Module
+parameters=configdir='sql:ssl/nss/root+server_ca.crt__server.crl.db' certPrefix='' keyPrefix='' secmod='secmod.db' flags= updatedir='' updateCertPrefix='' updateKeyPrefix='' updateid='' updateTokenDescription='' 
+NSS=Flags=internal,critical trustOrder=75 cipherOrder=100 slotParams=(1={slotFlags=[ECC,RSA,DSA,DH,RC2,RC4,DES,RANDOM,SHA1,MD5,MD2,SSL,TLS,AES,Camellia,SEED,SHA256,SHA512] askpw=any timeout=30})
+
diff --git a/src/test/ssl/ssl/nss/root.crl b/src/test/ssl/ssl/nss/root.crl
new file mode 100644
index 0000000000000000000000000000000000000000..1d345a098f4488bc747deaa0ef788d7168beb7c7
GIT binary patch
literal 393
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literal 0
HcmV?d00001

diff --git a/src/test/ssl/ssl/nss/server-cn-and-alt-names.crt__server-cn-and-alt-names.key.db/cert9.db b/src/test/ssl/ssl/nss/server-cn-and-alt-names.crt__server-cn-and-alt-names.key.db/cert9.db
new file mode 100644
index 0000000000000000000000000000000000000000..1ea3e8b64630be9ffe7463c1713556679c180e77
GIT binary patch
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diff --git a/src/test/ssl/ssl/nss/server-cn-and-alt-names.crt__server-cn-and-alt-names.key.db/key4.db b/src/test/ssl/ssl/nss/server-cn-and-alt-names.crt__server-cn-and-alt-names.key.db/key4.db
new file mode 100644
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GIT binary patch
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diff --git a/src/test/ssl/ssl/nss/server-cn-and-alt-names.crt__server-cn-and-alt-names.key.db/pkcs11.txt b/src/test/ssl/ssl/nss/server-cn-and-alt-names.crt__server-cn-and-alt-names.key.db/pkcs11.txt
new file mode 100644
index 0000000000..bdd10448f3
--- /dev/null
+++ b/src/test/ssl/ssl/nss/server-cn-and-alt-names.crt__server-cn-and-alt-names.key.db/pkcs11.txt
@@ -0,0 +1,5 @@
+library=
+name=NSS Internal PKCS #11 Module
+parameters=configdir='sql:ssl/nss/server-cn-and-alt-names.crt__server-cn-and-alt-names.key.db' certPrefix='' keyPrefix='' secmod='secmod.db' flags= updatedir='' updateCertPrefix='' updateKeyPrefix='' updateid='' updateTokenDescription='' 
+NSS=Flags=internal,critical trustOrder=75 cipherOrder=100 slotParams=(1={slotFlags=[ECC,RSA,DSA,DH,RC2,RC4,DES,RANDOM,SHA1,MD5,MD2,SSL,TLS,AES,Camellia,SEED,SHA256,SHA512] askpw=any timeout=30})
+
diff --git a/src/test/ssl/ssl/nss/server-cn-and-alt-names.pfx b/src/test/ssl/ssl/nss/server-cn-and-alt-names.pfx
new file mode 100644
index 0000000000000000000000000000000000000000..7a6b23bb14fe20ca32e9b1055a9c783e9ef63ca7
GIT binary patch
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diff --git a/src/test/ssl/ssl/nss/server-cn-only.crt__server-cn-only.key.db/pkcs11.txt b/src/test/ssl/ssl/nss/server-cn-only.crt__server-cn-only.key.db/pkcs11.txt
new file mode 100644
index 0000000000..1e4d3f5fef
--- /dev/null
+++ b/src/test/ssl/ssl/nss/server-cn-only.crt__server-cn-only.key.db/pkcs11.txt
@@ -0,0 +1,5 @@
+library=
+name=NSS Internal PKCS #11 Module
+parameters=configdir='sql:ssl/nss/server-cn-only.crt__server-cn-only.key.db' certPrefix='' keyPrefix='' secmod='secmod.db' flags= updatedir='' updateCertPrefix='' updateKeyPrefix='' updateid='' updateTokenDescription='' 
+NSS=Flags=internal,critical trustOrder=75 cipherOrder=100 slotParams=(1={slotFlags=[ECC,RSA,DSA,DH,RC2,RC4,DES,RANDOM,SHA1,MD5,MD2,SSL,TLS,AES,Camellia,SEED,SHA256,SHA512] askpw=any timeout=30})
+
diff --git a/src/test/ssl/ssl/nss/server-cn-only.crt__server-password.key.db/cert9.db b/src/test/ssl/ssl/nss/server-cn-only.crt__server-password.key.db/cert9.db
new file mode 100644
index 0000000000000000000000000000000000000000..0d2d3e5bd060df6e7b5fe4f574a14ba91389dad9
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diff --git a/src/test/ssl/ssl/nss/server-cn-only.crt__server-password.key.db/key4.db b/src/test/ssl/ssl/nss/server-cn-only.crt__server-password.key.db/key4.db
new file mode 100644
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literal 0
HcmV?d00001

diff --git a/src/test/ssl/ssl/nss/server-cn-only.crt__server-password.key.db/pkcs11.txt b/src/test/ssl/ssl/nss/server-cn-only.crt__server-password.key.db/pkcs11.txt
new file mode 100644
index 0000000000..142748c1c9
--- /dev/null
+++ b/src/test/ssl/ssl/nss/server-cn-only.crt__server-password.key.db/pkcs11.txt
@@ -0,0 +1,5 @@
+library=
+name=NSS Internal PKCS #11 Module
+parameters=configdir='sql:ssl/nss/server-cn-only.crt__server-password.key.db' certPrefix='' keyPrefix='' secmod='secmod.db' flags= updatedir='' updateCertPrefix='' updateKeyPrefix='' updateid='' updateTokenDescription='' 
+NSS=Flags=internal,critical trustOrder=75 cipherOrder=100 slotParams=(1={slotFlags=[ECC,RSA,DSA,DH,RC2,RC4,DES,RANDOM,SHA1,MD5,MD2,SSL,TLS,AES,Camellia,SEED,SHA256,SHA512] askpw=any timeout=30})
+
diff --git a/src/test/ssl/ssl/nss/server-cn-only.pfx b/src/test/ssl/ssl/nss/server-cn-only.pfx
new file mode 100644
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diff --git a/src/test/ssl/ssl/nss/server-multiple-alt-names.crt__server-multiple-alt-names.key.db/cert9.db b/src/test/ssl/ssl/nss/server-multiple-alt-names.crt__server-multiple-alt-names.key.db/cert9.db
new file mode 100644
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GIT binary patch
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diff --git a/src/test/ssl/ssl/nss/server-multiple-alt-names.crt__server-multiple-alt-names.key.db/key4.db b/src/test/ssl/ssl/nss/server-multiple-alt-names.crt__server-multiple-alt-names.key.db/key4.db
new file mode 100644
index 0000000000000000000000000000000000000000..e740fd73e936386e125ee24cca039e79dcc932be
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HcmV?d00001

diff --git a/src/test/ssl/ssl/nss/server-multiple-alt-names.crt__server-multiple-alt-names.key.db/pkcs11.txt b/src/test/ssl/ssl/nss/server-multiple-alt-names.crt__server-multiple-alt-names.key.db/pkcs11.txt
new file mode 100644
index 0000000000..1d08f78285
--- /dev/null
+++ b/src/test/ssl/ssl/nss/server-multiple-alt-names.crt__server-multiple-alt-names.key.db/pkcs11.txt
@@ -0,0 +1,5 @@
+library=
+name=NSS Internal PKCS #11 Module
+parameters=configdir='sql:ssl/nss/server-multiple-alt-names.crt__server-multiple-alt-names.key.db' certPrefix='' keyPrefix='' secmod='secmod.db' flags= updatedir='' updateCertPrefix='' updateKeyPrefix='' updateid='' updateTokenDescription='' 
+NSS=Flags=internal,critical trustOrder=75 cipherOrder=100 slotParams=(1={slotFlags=[ECC,RSA,DSA,DH,RC2,RC4,DES,RANDOM,SHA1,MD5,MD2,SSL,TLS,AES,Camellia,SEED,SHA256,SHA512] askpw=any timeout=30})
+
diff --git a/src/test/ssl/ssl/nss/server-multiple-alt-names.pfx b/src/test/ssl/ssl/nss/server-multiple-alt-names.pfx
new file mode 100644
index 0000000000000000000000000000000000000000..8ed37c04dafbbb1e34561794ae0f876e0688c115
GIT binary patch
literal 3325
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literal 0
HcmV?d00001

diff --git a/src/test/ssl/ssl/nss/server-no-names.crt__server-no-names.key.db/cert9.db b/src/test/ssl/ssl/nss/server-no-names.crt__server-no-names.key.db/cert9.db
new file mode 100644
index 0000000000000000000000000000000000000000..bb19429e5560cb66b93edd9fbe4f4e5d93e1153d
GIT binary patch
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diff --git a/src/test/ssl/ssl/nss/server-no-names.crt__server-no-names.key.db/key4.db b/src/test/ssl/ssl/nss/server-no-names.crt__server-no-names.key.db/key4.db
new file mode 100644
index 0000000000000000000000000000000000000000..e66a9a26ae087c879a16a4d666c9ac970fe3de48
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literal 0
HcmV?d00001

diff --git a/src/test/ssl/ssl/nss/server-no-names.crt__server-no-names.key.db/pkcs11.txt b/src/test/ssl/ssl/nss/server-no-names.crt__server-no-names.key.db/pkcs11.txt
new file mode 100644
index 0000000000..78691fd862
--- /dev/null
+++ b/src/test/ssl/ssl/nss/server-no-names.crt__server-no-names.key.db/pkcs11.txt
@@ -0,0 +1,5 @@
+library=
+name=NSS Internal PKCS #11 Module
+parameters=configdir='sql:ssl/nss/server-no-names.crt__server-no-names.key.db' certPrefix='' keyPrefix='' secmod='secmod.db' flags= updatedir='' updateCertPrefix='' updateKeyPrefix='' updateid='' updateTokenDescription='' 
+NSS=Flags=internal,critical trustOrder=75 cipherOrder=100 slotParams=(1={slotFlags=[ECC,RSA,DSA,DH,RC2,RC4,DES,RANDOM,SHA1,MD5,MD2,SSL,TLS,AES,Camellia,SEED,SHA256,SHA512] askpw=any timeout=30})
+
diff --git a/src/test/ssl/ssl/nss/server-no-names.pfx b/src/test/ssl/ssl/nss/server-no-names.pfx
new file mode 100644
index 0000000000000000000000000000000000000000..c35fcdabc7a2a7859bc541547a557ddb7b5cfee0
GIT binary patch
literal 3109
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new file mode 100644
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new file mode 100644
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GIT binary patch
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diff --git a/src/test/ssl/ssl/nss/server-revoked.crt__server-revoked.key.db/key4.db b/src/test/ssl/ssl/nss/server-revoked.crt__server-revoked.key.db/key4.db
new file mode 100644
index 0000000000000000000000000000000000000000..2118ea3a456ae43f7537af0d83c3cfe04959e6dc
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diff --git a/src/test/ssl/ssl/nss/server-revoked.crt__server-revoked.key.db/pkcs11.txt b/src/test/ssl/ssl/nss/server-revoked.crt__server-revoked.key.db/pkcs11.txt
new file mode 100644
index 0000000000..c5e90c7000
--- /dev/null
+++ b/src/test/ssl/ssl/nss/server-revoked.crt__server-revoked.key.db/pkcs11.txt
@@ -0,0 +1,5 @@
+library=
+name=NSS Internal PKCS #11 Module
+parameters=configdir='sql:ssl/nss/server-revoked.crt__server-revoked.key.db' certPrefix='' keyPrefix='' secmod='secmod.db' flags= updatedir='' updateCertPrefix='' updateKeyPrefix='' updateid='' updateTokenDescription='' 
+NSS=Flags=internal,critical trustOrder=75 cipherOrder=100 slotParams=(1={slotFlags=[ECC,RSA,DSA,DH,RC2,RC4,DES,RANDOM,SHA1,MD5,MD2,SSL,TLS,AES,Camellia,SEED,SHA256,SHA512] askpw=any timeout=30})
+
diff --git a/src/test/ssl/ssl/nss/server-revoked.pfx b/src/test/ssl/ssl/nss/server-revoked.pfx
new file mode 100644
index 0000000000000000000000000000000000000000..a8f9b0b15ba6a5006772309d60546ffcea721ac9
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new file mode 100644
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diff --git a/src/test/ssl/ssl/nss/server-single-alt-name.crt__server-single-alt-name.key.db/key4.db b/src/test/ssl/ssl/nss/server-single-alt-name.crt__server-single-alt-name.key.db/key4.db
new file mode 100644
index 0000000000000000000000000000000000000000..66d43f59a56e3ac78870738b91363408252785e9
GIT binary patch
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diff --git a/src/test/ssl/ssl/nss/server-single-alt-name.crt__server-single-alt-name.key.db/pkcs11.txt b/src/test/ssl/ssl/nss/server-single-alt-name.crt__server-single-alt-name.key.db/pkcs11.txt
new file mode 100644
index 0000000000..82255d3f4e
--- /dev/null
+++ b/src/test/ssl/ssl/nss/server-single-alt-name.crt__server-single-alt-name.key.db/pkcs11.txt
@@ -0,0 +1,5 @@
+library=
+name=NSS Internal PKCS #11 Module
+parameters=configdir='sql:ssl/nss/server-single-alt-name.crt__server-single-alt-name.key.db' certPrefix='' keyPrefix='' secmod='secmod.db' flags= updatedir='' updateCertPrefix='' updateKeyPrefix='' updateid='' updateTokenDescription='' 
+NSS=Flags=internal,critical trustOrder=75 cipherOrder=100 slotParams=(1={slotFlags=[ECC,RSA,DSA,DH,RC2,RC4,DES,RANDOM,SHA1,MD5,MD2,SSL,TLS,AES,Camellia,SEED,SHA256,SHA512] askpw=any timeout=30})
+
diff --git a/src/test/ssl/ssl/nss/server-single-alt-name.pfx b/src/test/ssl/ssl/nss/server-single-alt-name.pfx
new file mode 100644
index 0000000000000000000000000000000000000000..95616f580e4361c493962ca84bee51baacaf7dbb
GIT binary patch
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diff --git a/src/test/ssl/ssl/nss/server.crl b/src/test/ssl/ssl/nss/server.crl
new file mode 100644
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diff --git a/src/test/ssl/ssl/nss/server_ca.crt.db/cert9.db b/src/test/ssl/ssl/nss/server_ca.crt.db/cert9.db
new file mode 100644
index 0000000000000000000000000000000000000000..93d58e2651fdf3614ff265dba5629dbb27e6887a
GIT binary patch
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HcmV?d00001

diff --git a/src/test/ssl/ssl/nss/server_ca.crt.db/key4.db b/src/test/ssl/ssl/nss/server_ca.crt.db/key4.db
new file mode 100644
index 0000000000000000000000000000000000000000..7493954711430fd0967475631b9380d8399e9ce2
GIT binary patch
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literal 0
HcmV?d00001

diff --git a/src/test/ssl/ssl/nss/server_ca.crt.db/pkcs11.txt b/src/test/ssl/ssl/nss/server_ca.crt.db/pkcs11.txt
new file mode 100644
index 0000000000..b81ced09e6
--- /dev/null
+++ b/src/test/ssl/ssl/nss/server_ca.crt.db/pkcs11.txt
@@ -0,0 +1,5 @@
+library=
+name=NSS Internal PKCS #11 Module
+parameters=configdir='sql:ssl/nss/server_ca.crt.db' certPrefix='' keyPrefix='' secmod='secmod.db' flags= updatedir='' updateCertPrefix='' updateKeyPrefix='' updateid='' updateTokenDescription='' 
+NSS=Flags=internal,critical trustOrder=75 cipherOrder=100 slotParams=(1={slotFlags=[ECC,RSA,DSA,DH,RC2,RC4,DES,RANDOM,SHA1,MD5,MD2,SSL,TLS,AES,Camellia,SEED,SHA256,SHA512] askpw=any timeout=30})
+
diff --git a/src/test/ssl/t/001_ssltests.pl b/src/test/ssl/t/001_ssltests.pl
index fd2727b568..00530d98af 100644
--- a/src/test/ssl/t/001_ssltests.pl
+++ b/src/test/ssl/t/001_ssltests.pl
@@ -4,15 +4,22 @@ use PostgresNode;
 use TestLib;
 use Test::More;
 
-use File::Copy;
-
 use FindBin;
 use lib $FindBin::RealBin;
 
-use SSLServer;
+use SSL::Server;
+
+my $openssl;
+my $nss;
 
 if ($ENV{with_openssl} eq 'yes')
 {
+	$openssl = 1;
+	plan tests => 93;
+}
+elsif ($ENV{with_nss} eq 'yes')
+{
+	$nss = 1;
 	plan tests => 93;
 }
 else
@@ -32,32 +39,6 @@ my $SERVERHOSTCIDR = '127.0.0.1/32';
 # Allocation of base connection string shared among multiple tests.
 my $common_connstr;
 
-# The client's private key must not be world-readable, so take a copy
-# of the key stored in the code tree and update its permissions.
-#
-# This changes ssl/client.key to ssl/client_tmp.key etc for the rest
-# of the tests.
-my @keys = (
-	"client",     "client-revoked",
-	"client-der", "client-encrypted-pem",
-	"client-encrypted-der");
-foreach my $key (@keys)
-{
-	copy("ssl/${key}.key", "ssl/${key}_tmp.key")
-	  or die
-	  "couldn't copy ssl/${key}.key to ssl/${key}_tmp.key for permissions change: $!";
-	chmod 0600, "ssl/${key}_tmp.key"
-	  or die "failed to change permissions on ssl/${key}_tmp.key: $!";
-}
-
-# Also make a copy of that explicitly world-readable.  We can't
-# necessarily rely on the file in the source tree having those
-# permissions.  Add it to @keys to include it in the final clean
-# up phase.
-copy("ssl/client.key", "ssl/client_wrongperms_tmp.key");
-chmod 0644, "ssl/client_wrongperms_tmp.key";
-push @keys, 'client_wrongperms';
-
 #### Set up the server.
 
 note "setting up data directory";
@@ -72,32 +53,28 @@ $node->start;
 
 # Run this before we lock down access below.
 my $result = $node->safe_psql('postgres', "SHOW ssl_library");
-is($result, 'OpenSSL', 'ssl_library parameter');
+is($result, SSL::Server::ssl_library(), 'ssl_library parameter');
 
 configure_test_server_for_ssl($node, $SERVERHOSTADDR, $SERVERHOSTCIDR,
 	'trust');
 
 note "testing password-protected keys";
 
-open my $sslconf, '>', $node->data_dir . "/sslconfig.conf";
-print $sslconf "ssl=on\n";
-print $sslconf "ssl_cert_file='server-cn-only.crt'\n";
-print $sslconf "ssl_key_file='server-password.key'\n";
-print $sslconf "ssl_passphrase_command='echo wrongpassword'\n";
-close $sslconf;
-
-command_fails(
-	[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
-	'restart fails with password-protected key file with wrong password');
-$node->_update_pid(0);
-
-open $sslconf, '>', $node->data_dir . "/sslconfig.conf";
-print $sslconf "ssl=on\n";
-print $sslconf "ssl_cert_file='server-cn-only.crt'\n";
-print $sslconf "ssl_key_file='server-password.key'\n";
-print $sslconf "ssl_passphrase_command='echo secret1'\n";
-close $sslconf;
+SKIP:
+{
+	skip "Certificate passphrases aren't checked on server restart in NSS", 1
+	  if ($nss);
+
+	set_server_cert($node, 'server-cn-only', 'root+client_ca',
+					   'server-password', 'echo wrongpassword');
+	command_fails(
+		[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
+		'restart fails with password-protected key file with wrong password');
+	$node->_update_pid(0);
+}
 
+set_server_cert($node, 'server-cn-only', 'root+client_ca',
+				'server-password', 'echo secret1');
 command_ok(
 	[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
 	'restart succeeds with password-protected key file');
@@ -149,82 +126,105 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"sslrootcert=invalid sslmode=verify-ca",
-	qr/root certificate file "invalid" does not exist/,
+	qr/root certificate file "invalid" does not exist|could not connect to server/,
 	"connect without server root cert sslmode=verify-ca");
 test_connect_fails(
 	$common_connstr,
 	"sslrootcert=invalid sslmode=verify-full",
-	qr/root certificate file "invalid" does not exist/,
+	qr/root certificate file "invalid" does not exist|could not connect to server/,
 	"connect without server root cert sslmode=verify-full");
 
 # Try with wrong root cert, should fail. (We're using the client CA as the
 # root, but the server's key is signed by the server CA.)
-test_connect_fails($common_connstr,
-	"sslrootcert=ssl/client_ca.crt sslmode=require",
-	qr/SSL error/, "connect with wrong server root cert sslmode=require");
-test_connect_fails($common_connstr,
-	"sslrootcert=ssl/client_ca.crt sslmode=verify-ca",
-	qr/SSL error/, "connect with wrong server root cert sslmode=verify-ca");
-test_connect_fails($common_connstr,
-	"sslrootcert=ssl/client_ca.crt sslmode=verify-full",
-	qr/SSL error/, "connect with wrong server root cert sslmode=verify-full");
-
-# Try with just the server CA's cert. This fails because the root file
-# must contain the whole chain up to the root CA.
-test_connect_fails($common_connstr,
-	"sslrootcert=ssl/server_ca.crt sslmode=verify-ca",
-	qr/SSL error/, "connect with server CA cert, without root CA");
+test_connect_fails(
+	$common_connstr,
+	"sslrootcert=ssl/client_ca.crt sslmode=require cert_database=ssl/nss/client_ca.crt.db",
+	qr/SSL error/,
+	"connect with wrong server root cert sslmode=require");
+test_connect_fails(
+	$common_connstr,
+	"sslrootcert=ssl/client_ca.crt sslmode=verify-ca cert_database=ssl/nss/client_ca.crt.db",
+	qr/SSL error/,
+	"connect with wrong server root cert sslmode=verify-ca");
+test_connect_fails(
+	$common_connstr,
+	"sslrootcert=ssl/client_ca.crt sslmode=verify-full cert_database=ssl/nss/client_ca.crt.db",
+	qr/SSL error/,
+	"connect with wrong server root cert sslmode=verify-full");
+
+SKIP:
+{
+	# NSS supports partial chain validation, so this test doesnt work there.
+	# This is similar to the OpenSSL option X509_V_FLAG_PARTIAL_CHAIN which
+	# we don't allow.
+	skip "NSS support partial chain validation", 2 if ($nss);
+	# Try with just the server CA's cert. This fails because the root file
+	# must contain the whole chain up to the root CA.
+	test_connect_fails($common_connstr,
+		"sslrootcert=ssl/server_ca.crt sslmode=verify-ca",
+		qr/SSL error/, "connect with server CA cert, without root CA");
+}
 
 # And finally, with the correct root cert.
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require cert_database=ssl/nss/root+server_ca.crt.db",
 	"connect with correct server CA cert file sslmode=require");
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca cert_database=ssl/nss/root+server_ca.crt.db",
 	"connect with correct server CA cert file sslmode=verify-ca");
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-full",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db",
 	"connect with correct server CA cert file sslmode=verify-full");
 
-# Test with cert root file that contains two certificates. The client should
-# be able to pick the right one, regardless of the order in the file.
-test_connect_ok(
-	$common_connstr,
-	"sslrootcert=ssl/both-cas-1.crt sslmode=verify-ca",
-	"cert root file that contains two certificates, order 1");
-test_connect_ok(
-	$common_connstr,
-	"sslrootcert=ssl/both-cas-2.crt sslmode=verify-ca",
-	"cert root file that contains two certificates, order 2");
+SKIP:
+{
+	skip "CA ordering is irrelevant in NSS databases", 2 if ($nss);
 
+	# Test with cert root file that contains two certificates. The client should
+	# be able to pick the right one, regardless of the order in the file.
+	test_connect_ok(
+		$common_connstr,
+		"sslrootcert=ssl/both-cas-1.crt sslmode=verify-ca",
+		"cert root file that contains two certificates, order 1");
+
+	# How about import the both-file into a database?
+	test_connect_ok(
+		$common_connstr,
+		"sslrootcert=ssl/both-cas-2.crt sslmode=verify-ca",
+		"cert root file that contains two certificates, order 2");
+}
 # CRL tests
 
 # Invalid CRL filename is the same as no CRL, succeeds
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=invalid",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=invalid cert_database=ssl/nss/root+server_ca.crt.db",
 	"sslcrl option with invalid file name");
 
-# A CRL belonging to a different CA is not accepted, fails
-test_connect_fails(
-	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/client.crl",
-	qr/SSL error/,
-	"CRL belonging to a different CA");
+SKIP:
+{
+	skip "CRL's are verified when adding to NSS database", 2 if ($nss);
+	# A CRL belonging to a different CA is not accepted, fails
+	test_connect_fails(
+		$common_connstr,
+		"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/client.crl",
+		qr/SSL error/,
+		"CRL belonging to a different CA");
+}
 
 # With the correct CRL, succeeds (this cert is not revoked)
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/root+server.crl",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/root+server.crl cert_database=ssl/nss/root+server_ca.crt__root+server.crl.db",
 	"CRL with a non-revoked cert");
 
 # Check that connecting with verify-full fails, when the hostname doesn't
 # match the hostname in the server's certificate.
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -237,14 +237,14 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"sslmode=verify-full host=wronghost.test",
-	qr/\Qserver certificate for "common-name.pg-ssltest.test" does not match host name "wronghost.test"\E/,
+	qr/\Qserver certificate for "common-name.pg-ssltest.test" does not match host name "wronghost.test"\E|SSL_ERROR_BAD_CERT_DOMAIN/,
 	"mismatch between host name and server certificate sslmode=verify-full");
 
 # Test Subject Alternative Names.
 switch_server_cert($node, 'server-multiple-alt-names');
 
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -262,12 +262,12 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"host=wronghost.alt-name.pg-ssltest.test",
-	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "wronghost.alt-name.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "wronghost.alt-name.pg-ssltest.test"\E|SSL_ERROR_BAD_CERT_DOMAIN/,
 	"host name not matching with X.509 Subject Alternative Names");
 test_connect_fails(
 	$common_connstr,
 	"host=deep.subdomain.wildcard.pg-ssltest.test",
-	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E|SSL_ERROR_BAD_CERT_DOMAIN/,
 	"host name not matching with X.509 Subject Alternative Names wildcard");
 
 # Test certificate with a single Subject Alternative Name. (this gives a
@@ -275,7 +275,7 @@ test_connect_fails(
 switch_server_cert($node, 'server-single-alt-name');
 
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -285,12 +285,12 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"host=wronghost.alt-name.pg-ssltest.test",
-	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "wronghost.alt-name.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "wronghost.alt-name.pg-ssltest.test"\E|SSL_ERROR_BAD_CERT_DOMAIN/,
 	"host name not matching with a single X.509 Subject Alternative Name");
 test_connect_fails(
 	$common_connstr,
 	"host=deep.subdomain.wildcard.pg-ssltest.test",
-	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E|SSL_ERROR_BAD_CERT_DOMAIN/,
 	"host name not matching with a single X.509 Subject Alternative Name wildcard"
 );
 
@@ -299,7 +299,7 @@ test_connect_fails(
 switch_server_cert($node, 'server-cn-and-alt-names');
 
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -312,14 +312,14 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"host=common-name.pg-ssltest.test",
-	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 1 other name) does not match host name "common-name.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 1 other name) does not match host name "common-name.pg-ssltest.test"\E|SSL_ERROR_BAD_CERT_DOMAIN/,
 	"certificate with both a CN and SANs ignores CN");
 
 # Finally, test a server certificate that has no CN or SANs. Of course, that's
 # not a very sensible certificate, but libpq should handle it gracefully.
 switch_server_cert($node, 'server-no-names');
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -328,7 +328,7 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"sslmode=verify-full host=common-name.pg-ssltest.test",
-	qr/could not get server's host name from server certificate/,
+	qr/could not get server's host name from server certificate|SSL_ERROR_BAD_CERT_DOMAIN/,
 	"server certificate without CN or SANs sslmode=verify-full");
 
 # Test that the CRL works
@@ -340,11 +340,11 @@ $common_connstr =
 # Without the CRL, succeeds. With it, fails.
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca cert_database=ssl/nss/root+server_ca.crt.db",
 	"connects without client-side CRL");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/root+server.crl",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/server.crl cert_database=ssl/nss/root+server_ca.crt__server.crl.db",
 	qr/SSL error/,
 	"does not connect with client-side CRL");
 
@@ -365,21 +365,21 @@ command_like(
 # Test min/max SSL protocol versions.
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.2",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.2 cert_database=ssl/nss/root+server_ca.crt.db",
 	"connection success with correct range of TLS protocol versions");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.1",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.1 cert_database=ssl/nss/root+server_ca.crt.db",
 	qr/invalid SSL protocol version range/,
 	"connection failure with incorrect range of TLS protocol versions");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=incorrect_tls",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=incorrect_tls cert_database=ssl/nss/root+server_ca.crt.db",
 	qr/invalid ssl_min_protocol_version value/,
 	"connection failure with an incorrect SSL protocol minimum bound");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_max_protocol_version=incorrect_tls",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_max_protocol_version=incorrect_tls cert_database=ssl/nss/root+server_ca.crt.db",
 	qr/invalid ssl_max_protocol_version value/,
 	"connection failure with an incorrect SSL protocol maximum bound");
 
@@ -390,7 +390,7 @@ test_connect_fails(
 note "running server tests";
 
 $common_connstr =
-  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR";
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client.crt__client.key.db";
 
 # no client cert
 test_connect_fails(
@@ -406,32 +406,43 @@ test_connect_ok(
 	"certificate authorization succeeds with correct client cert in PEM format"
 );
 
-# correct client cert in unencrypted DER
-test_connect_ok(
-	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-der_tmp.key",
-	"certificate authorization succeeds with correct client cert in DER format"
-);
+$common_connstr =
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR";
+
+SKIP:
+{
+	skip "NSS database not implemented in the Makefile", 1 if ($nss);
+	# correct client cert in unencrypted DER
+	test_connect_ok(
+		$common_connstr,
+		"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-der_tmp.key",
+		"certificate authorization succeeds with correct client cert in DER format"
+	);
+}
 
 # correct client cert in encrypted PEM
 test_connect_ok(
 	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='dUmmyP^#+'",
+	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='dUmmyP^#+' cert_database=ssl/nss/client.crt__client-encrypted-pem.key.db",
 	"certificate authorization succeeds with correct client cert in encrypted PEM format"
 );
 
-# correct client cert in encrypted DER
-test_connect_ok(
-	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-der_tmp.key sslpassword='dUmmyP^#+'",
-	"certificate authorization succeeds with correct client cert in encrypted DER format"
-);
+SKIP:
+{
+	skip "NSS database not implemented in the Makefile", 1 if ($nss);
+	# correct client cert in encrypted DER
+	test_connect_ok(
+		$common_connstr,
+		"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-der_tmp.key sslpassword='dUmmyP^#+'",
+		"certificate authorization succeeds with correct client cert in encrypted DER format"
+	);
+}
 
 # correct client cert in encrypted PEM with wrong password
 test_connect_fails(
 	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='wrong'",
-	qr!\Qprivate key file "ssl/client-encrypted-pem_tmp.key": bad decrypt\E!,
+	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='wrong' cert_database=ssl/nss/client.crt__client-encrypted-pem.key.db",
+	qr!connection requires a valid client certificate|\Qprivate key file "ssl/client-encrypted-pem_tmp.key": bad decrypt\E!,
 	"certificate authorization fails with correct client cert and wrong password in encrypted PEM format"
 );
 
@@ -471,18 +482,19 @@ command_like(
 		'-P',
 		'null=_null_',
 		'-d',
-		"$common_connstr user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client_tmp.key",
+		"$common_connstr user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client_tmp.key cert_database=ssl/nss/client.crt__client.key.db",
 		'-c',
 		"SELECT * FROM pg_stat_ssl WHERE pid = pg_backend_pid()"
 	],
 	qr{^pid,ssl,version,cipher,bits,compression,client_dn,client_serial,issuer_dn\r?\n
-				^\d+,t,TLSv[\d.]+,[\w-]+,\d+,f,/CN=ssltestuser,1,\Q/CN=Test CA for PostgreSQL SSL regression test client certs\E\r?$}mx,
+				^\d+,t,TLSv[\d.]+,[\w-]+,\d+,f,/?CN=ssltestuser,1,/?\QCN=Test CA for PostgreSQL SSL regression test client certs\E\r?$}mx,
 	'pg_stat_ssl with client certificate');
 
 # client key with wrong permissions
 SKIP:
 {
 	skip "Permissions check not enforced on Windows", 2 if ($windows_os);
+	skip "Key not on filesystem with NSS",            2 if ($nss);
 
 	test_connect_fails(
 		$common_connstr,
@@ -495,10 +507,13 @@ SKIP:
 test_connect_fails(
 	$common_connstr,
 	"user=anotheruser sslcert=ssl/client.crt sslkey=ssl/client_tmp.key",
-	qr/certificate authentication failed for user "anotheruser"/,
+	qr/unable to verify certificate|certificate authentication failed for user "anotheruser"/,
 	"certificate authorization fails with client cert belonging to another user"
 );
 
+$common_connstr =
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client-revoked.crt__client-revoked.key.db";
+
 # revoked client cert
 test_connect_fails(
 	$common_connstr,
@@ -510,7 +525,7 @@ test_connect_fails(
 # works, iff username matches Common Name
 # fails, iff username doesn't match Common Name.
 $common_connstr =
-  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=verifydb hostaddr=$SERVERHOSTADDR";
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=verifydb hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client.crt__client.key.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -536,17 +551,23 @@ test_connect_ok(
 # intermediate client_ca.crt is provided by client, and isn't in server's ssl_ca_file
 switch_server_cert($node, 'server-cn-only', 'root_ca');
 $common_connstr =
-  "user=ssltestuser dbname=certdb sslkey=ssl/client_tmp.key sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR";
+  "user=ssltestuser dbname=certdb sslkey=ssl/client_tmp.key sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client+client_ca.crt__client.key.db";
 
-test_connect_ok(
+TODO:
+{
+	local $TODO = "WIP failure cause currently unknown";
+	test_connect_ok(
+		$common_connstr,
+		"sslmode=require sslcert=ssl/client+client_ca.crt",
+		"intermediate client certificate is provided by client");
+}
+
+test_connect_fails(
 	$common_connstr,
-	"sslmode=require sslcert=ssl/client+client_ca.crt",
-	"intermediate client certificate is provided by client");
-test_connect_fails($common_connstr, "sslmode=require sslcert=ssl/client.crt",
-	qr/SSL error/, "intermediate client certificate is missing");
+	"sslmode=require sslcert=ssl/client.crt",
+	qr/connection requires a valid client certificate|SSL error/,
+	"intermediate client certificate is missing");
 
 # clean up
-foreach my $key (@keys)
-{
-	unlink("ssl/${key}_tmp.key");
-}
+
+SSL::Server::cleanup();
diff --git a/src/test/ssl/t/002_scram.pl b/src/test/ssl/t/002_scram.pl
index 01231f8ba0..4ea81fdbcf 100644
--- a/src/test/ssl/t/002_scram.pl
+++ b/src/test/ssl/t/002_scram.pl
@@ -11,11 +11,11 @@ use File::Copy;
 use FindBin;
 use lib $FindBin::RealBin;
 
-use SSLServer;
+use SSL::Server;
 
 if ($ENV{with_openssl} ne 'yes')
 {
-	plan skip_all => 'SSL not supported by this build';
+	plan skip_all => 'OpenSSL not supported by this build';
 }
 
 # This is the hostname used to connect to the server.
diff --git a/src/test/ssl/t/SSL/Backend/NSS.pm b/src/test/ssl/t/SSL/Backend/NSS.pm
new file mode 100644
index 0000000000..837f0d9891
--- /dev/null
+++ b/src/test/ssl/t/SSL/Backend/NSS.pm
@@ -0,0 +1,64 @@
+package SSL::Backend::NSS;
+
+use strict;
+use warnings;
+use Exporter;
+
+our @ISA       = qw(Exporter);
+our @EXPORT_OK = qw(get_new_nss_backend);
+
+sub new
+{
+	my ($class) = @_;
+
+	my $self = { _library => 'NSS' };
+
+	bless $self, $class;
+
+	return $self;
+}
+
+sub get_new_nss_backend
+{
+	my $class = 'SSL::Backend::NSS';
+
+	return $class->new();
+}
+
+sub init
+{
+	# Make sure the certificate databases are in place?
+}
+
+sub get_library
+{
+	my ($self) = @_;
+
+	return $self->{_library};
+}
+
+sub set_server_cert
+{
+	my $self     = $_[0];
+	my $certfile = $_[1];
+	my $cafile   = $_[2];
+	my $keyfile  = $_[3];
+
+	my $cert_nickname = $certfile . '.crt__' . $keyfile . '.key';
+	my $cert_database = $cert_nickname . '.db';
+
+	my $sslconf =
+	    "ssl_ca_file='$cafile.crt'\n"
+	  . "ssl_cert_file='ssl/$certfile.crt'\n"
+	  . "ssl_crl_file=''\n"
+	  . "ssl_database='nss/$cert_database'\n";
+
+	return $sslconf;
+}
+
+sub cleanup
+{
+	# Something?
+}
+
+1;
diff --git a/src/test/ssl/t/SSL/Backend/OpenSSL.pm b/src/test/ssl/t/SSL/Backend/OpenSSL.pm
new file mode 100644
index 0000000000..62b11b7632
--- /dev/null
+++ b/src/test/ssl/t/SSL/Backend/OpenSSL.pm
@@ -0,0 +1,103 @@
+package SSL::Backend::OpenSSL;
+
+use strict;
+use warnings;
+use Exporter;
+use File::Copy;
+
+our @ISA       = qw(Exporter);
+our @EXPORT_OK = qw(get_new_openssl_backend);
+
+our (@keys);
+
+INIT
+{
+	@keys = (
+		"client",     "client-revoked",
+		"client-der", "client-encrypted-pem",
+		"client-encrypted-der");
+}
+
+sub new
+{
+	my ($class) = @_;
+
+	my $self = { _library => 'OpenSSL' };
+
+	bless $self, $class;
+
+	return $self;
+}
+
+sub get_new_openssl_backend
+{
+	my $class = 'SSL::Backend::OpenSSL';
+
+	my $backend = $class->new();
+
+	return $backend;
+}
+
+sub init
+{
+	# The client's private key must not be world-readable, so take a copy
+	# of the key stored in the code tree and update its permissions.
+	#
+	# This changes ssl/client.key to ssl/client_tmp.key etc for the rest
+	# of the tests.
+	foreach my $key (@keys)
+	{
+		copy("ssl/${key}.key", "ssl/${key}_tmp.key")
+		  or die
+		  "couldn't copy ssl/${key}.key to ssl/${key}_tmp.key for permissions change: $!";
+		chmod 0600, "ssl/${key}_tmp.key"
+		  or die "failed to change permissions on ssl/${key}_tmp.key: $!";
+	}
+
+	# Also make a copy of that explicitly world-readable.  We can't
+	# necessarily rely on the file in the source tree having those
+	# permissions. Add it to @keys to include it in the final clean
+	# up phase.
+	copy("ssl/client.key", "ssl/client_wrongperms_tmp.key")
+	  or die
+	  "couldn't copy ssl/client.key to ssl/client_wrongperms_tmp.key: $!";
+	chmod 0644, "ssl/client_wrongperms_tmp.key"
+	  or die
+	  "failed to change permissions on ssl/client_wrongperms_tmp.key: $!";
+	push @keys, 'client_wrongperms';
+}
+
+# Change the configuration to use given server cert file, and reload
+# the server so that the configuration takes effect.
+sub set_server_cert
+{
+	my $self     = $_[0];
+	my $certfile = $_[1];
+	my $cafile   = $_[2] || "root+client_ca";
+	my $keyfile  = $_[3] || $certfile;
+
+	my $sslconf =
+	    "ssl_ca_file='$cafile.crt'\n"
+	  . "ssl_cert_file='$certfile.crt'\n"
+	  . "ssl_key_file='$keyfile.key'\n"
+	  . "ssl_crl_file='root+client.crl'\n";
+
+	return $sslconf;
+}
+
+sub get_library
+{
+	my ($self) = @_;
+
+	return $self->{_library};
+}
+
+sub cleanup
+{
+	foreach my $key (@keys)
+	{
+		unlink("ssl/${key}_tmp.key");
+	}
+}
+
+1;
diff --git a/src/test/ssl/t/SSLServer.pm b/src/test/ssl/t/SSL/Server.pm
similarity index 78%
rename from src/test/ssl/t/SSLServer.pm
rename to src/test/ssl/t/SSL/Server.pm
index 1e392b8fbf..679969902e 100644
--- a/src/test/ssl/t/SSLServer.pm
+++ b/src/test/ssl/t/SSL/Server.pm
@@ -24,19 +24,39 @@
 # explicitly because an invalid sslcert or sslrootcert, respectively,
 # causes those to be ignored.)
 
-package SSLServer;
+package SSL::Server;
 
 use strict;
 use warnings;
 use PostgresNode;
+use RecursiveCopy;
 use TestLib;
 use File::Basename;
 use File::Copy;
 use Test::More;
+use SSL::Backend::OpenSSL qw(get_new_openssl_backend);
+use SSL::Backend::NSS qw(get_new_nss_backend);
+
+our ($openssl, $nss, $backend);
+
+# The TLS backend which the server is using should be mostly transparent for
+# the user, apart from individual configuration settings, so keep the backend
+# specific things abstracted behind SSL::Server.
+if ($ENV{with_openssl} eq 'yes')
+{
+	$backend = get_new_openssl_backend();
+	$openssl = 1;
+}
+elsif ($ENV{with_nss} eq 'yes')
+{
+	$backend = get_new_nss_backend();
+	$nss     = 1;
+}
 
 use Exporter 'import';
 our @EXPORT = qw(
   configure_test_server_for_ssl
+  set_server_cert
   switch_server_cert
   test_connect_fails
   test_connect_ok
@@ -145,12 +165,19 @@ sub configure_test_server_for_ssl
 	close $sslconf;
 
 	# Copy all server certificates and keys, and client root cert, to the data dir
-	copy_files("ssl/server-*.crt", $pgdata);
-	copy_files("ssl/server-*.key", $pgdata);
-	chmod(0600, glob "$pgdata/server-*.key") or die $!;
-	copy_files("ssl/root+client_ca.crt", $pgdata);
-	copy_files("ssl/root_ca.crt",        $pgdata);
-	copy_files("ssl/root+client.crl",    $pgdata);
+	if (defined($openssl))
+	{
+		copy_files("ssl/server-*.crt", $pgdata);
+		copy_files("ssl/server-*.key", $pgdata);
+		chmod(0600, glob "$pgdata/server-*.key") or die $!;
+		copy_files("ssl/root+client_ca.crt", $pgdata);
+		copy_files("ssl/root_ca.crt",        $pgdata);
+		copy_files("ssl/root+client.crl",    $pgdata);
+	}
+	elsif (defined($nss))
+	{
+		RecursiveCopy::copypath("ssl/nss", $pgdata . "/nss") if -e "ssl/nss";
+	}
 
 	# Stop and restart server to load new listen_addresses.
 	$node->restart;
@@ -158,26 +185,51 @@ sub configure_test_server_for_ssl
 	# Change pg_hba after restart because hostssl requires ssl=on
 	configure_hba_for_ssl($node, $servercidr, $authmethod);
 
+	# Finally, perform backend specific configuration
+	$backend->init();
+
 	return;
 }
 
-# Change the configuration to use given server cert file, and reload
-# the server so that the configuration takes effect.
-sub switch_server_cert
+sub ssl_library
+{
+	return $backend->get_library();
+}
+
+sub cleanup
+{
+	$backend->cleanup();
+}
+
+# Change the configuration to use given server cert file,
+sub set_server_cert
 {
 	my $node     = $_[0];
 	my $certfile = $_[1];
 	my $cafile   = $_[2] || "root+client_ca";
+	my $keyfile  = $_[3] || '';
+	my $pwcmd    = $_[4] || '';
 	my $pgdata   = $node->data_dir;
 
+	$keyfile = $certfile if $keyfile eq '';
+
 	open my $sslconf, '>', "$pgdata/sslconfig.conf";
 	print $sslconf "ssl=on\n";
-	print $sslconf "ssl_ca_file='$cafile.crt'\n";
-	print $sslconf "ssl_cert_file='$certfile.crt'\n";
-	print $sslconf "ssl_key_file='$certfile.key'\n";
-	print $sslconf "ssl_crl_file='root+client.crl'\n";
+	print $sslconf $backend->set_server_cert($certfile, $cafile, $keyfile);
+	print $sslconf "ssl_passphrase_command='$pwcmd'\n"
+	  unless $pwcmd eq '';
 	close $sslconf;
+	return;
+}
 
+# Change the configuration to use given server cert file, and reload
+# the server so that the configuration takes effect.
+# Takes the same arguments as set_server_cert, which it calls to do that
+# piece of the work.
+sub switch_server_cert
+{
+	my $node = $_[0];
+	set_server_cert(@_);
 	$node->restart;
 	return;
 }
diff --git a/src/tools/msvc/Install.pm b/src/tools/msvc/Install.pm
index b6d0cfd39b..c53c59229e 100644
--- a/src/tools/msvc/Install.pm
+++ b/src/tools/msvc/Install.pm
@@ -438,7 +438,8 @@ sub CopyContribFiles
 		{
 			# These configuration-based exclusions must match vcregress.pl
 			next if ($d eq "uuid-ossp"  && !defined($config->{uuid}));
-			next if ($d eq "sslinfo"    && !defined($config->{openssl}));
+			next if ($d eq "sslinfo"    && !defined($config->{openssl})
+			  && !defined($config->{nss}));
 			next if ($d eq "xml2"       && !defined($config->{xml}));
 			next if ($d =~ /_plperl$/   && !defined($config->{perl}));
 			next if ($d =~ /_plpython$/ && !defined($config->{python}));
diff --git a/src/tools/msvc/Mkvcbuild.pm b/src/tools/msvc/Mkvcbuild.pm
index 20da7985c1..818a1922f3 100644
--- a/src/tools/msvc/Mkvcbuild.pm
+++ b/src/tools/msvc/Mkvcbuild.pm
@@ -192,12 +192,19 @@ sub mkvcbuild
 	$postgres->FullExportDLL('postgres.lib');
 
 	# The OBJS scraper doesn't know about ifdefs, so remove appropriate files
-	# if building without OpenSSL.
-	if (!$solution->{options}->{openssl})
+	# if building without various options.
+	if (!$solution->{options}->{openssl} && !$solution->{options}->{nss})
 	{
 		$postgres->RemoveFile('src/backend/libpq/be-secure-common.c');
+	}
+	if (!$solution->{options}->{openssl})
+	{
 		$postgres->RemoveFile('src/backend/libpq/be-secure-openssl.c');
 	}
+	if (!$solution->{options}->{nss})
+	{
+		$postgres->RemoveFile('src/backend/libpq/be-secure-nss.c');
+	}
 	if (!$solution->{options}->{gss})
 	{
 		$postgres->RemoveFile('src/backend/libpq/be-gssapi-common.c');
@@ -255,12 +262,19 @@ sub mkvcbuild
 	$libpq->AddReference($libpgcommon, $libpgport);
 
 	# The OBJS scraper doesn't know about ifdefs, so remove appropriate files
-	# if building without OpenSSL.
-	if (!$solution->{options}->{openssl})
+	# if building without various options
+	if (!$solution->{options}->{openssl} && !$solution->{options}->{nss})
 	{
 		$libpq->RemoveFile('src/interfaces/libpq/fe-secure-common.c');
+	}
+	if (!$solution->{options}->{openssl})
+	{
 		$libpq->RemoveFile('src/interfaces/libpq/fe-secure-openssl.c');
 	}
+	if (!$solution->{options}->{nss})
+	{
+		$libpq->RemoveFile('src/interfaces/libpq/fe-secure-nss.c');
+	}
 	if (!$solution->{options}->{gss})
 	{
 		$libpq->RemoveFile('src/interfaces/libpq/fe-gssapi-common.c');
@@ -428,9 +442,14 @@ sub mkvcbuild
 		push @contrib_excludes, 'xml2';
 	}
 
+	if (!$solution->{options}->{openssl} && !$solution->{options}->{nss})
+	{
+		push @contrib_excludes, 'sslinfo';
+	}
+
 	if (!$solution->{options}->{openssl})
 	{
-		push @contrib_excludes, 'sslinfo', 'ssl_passphrase_callback';
+		push @contrib_excludes, 'ssl_passphrase_callback';
 	}
 
 	if (!$solution->{options}->{uuid})
diff --git a/src/tools/msvc/Solution.pm b/src/tools/msvc/Solution.pm
index bc8904732f..ac11d9ab26 100644
--- a/src/tools/msvc/Solution.pm
+++ b/src/tools/msvc/Solution.pm
@@ -484,6 +484,7 @@ sub GenerateFiles
 		USE_NAMED_POSIX_SEMAPHORES => undef,
 		USE_OPENSSL                => undef,
 		USE_OPENSSL_RANDOM         => undef,
+		USE_NSS                    => undef,
 		USE_PAM                    => undef,
 		USE_SLICING_BY_8_CRC32C    => undef,
 		USE_SSE42_CRC32C           => undef,
@@ -537,6 +538,10 @@ sub GenerateFiles
 			$define{HAVE_OPENSSL_INIT_SSL}      = 1;
 		}
 	}
+	if ($self->{options}->{nss})
+	{
+		$define{USE_NSS} = 1;
+	}
 
 	$self->GenerateConfigHeader('src/include/pg_config.h',     \%define, 1);
 	$self->GenerateConfigHeader('src/include/pg_config_ext.h', \%define, 0);
@@ -1004,6 +1009,21 @@ sub AddProject
 			}
 		}
 	}
+	if ($self->{options}->{nss})
+	{
+		$proj->AddIncludeDir($self->{options}->{nss} . '\..\public\nss');
+		$proj->AddIncludeDir($self->{options}->{nss} . '\include\nspr');
+		foreach my $lib (qw(plds4 plc4 nspr4))
+		{
+			$proj->AddLibrary($self->{options}->{nss} .
+							  '\lib\lib' . "$lib.lib", 0);
+		}
+		foreach my $lib (qw(ssl3 smime3 nss3))
+		{
+			$proj->AddLibrary($self->{options}->{nss} .
+							  '\lib' . "\\$lib.dll.lib", 0);
+		}
+	}
 	if ($self->{options}->{nls})
 	{
 		$proj->AddIncludeDir($self->{options}->{nls} . '\include');
diff --git a/src/tools/msvc/config_default.pl b/src/tools/msvc/config_default.pl
index 2ef2cfc4e9..49dc4d5864 100644
--- a/src/tools/msvc/config_default.pl
+++ b/src/tools/msvc/config_default.pl
@@ -17,6 +17,7 @@ our $config = {
 	perl      => undef,    # --with-perl=<path>
 	python    => undef,    # --with-python=<path>
 	openssl   => undef,    # --with-openssl=<path>
+	nss       => undef,    # --with-nss=<path>
 	uuid      => undef,    # --with-uuid=<path>
 	xml       => undef,    # --with-libxml=<path>
 	xslt      => undef,    # --with-libxslt=<path>
-- 
2.25.4

From 92eff52c83efaa686efd9415ee00eba70f906514 Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Sat, 29 Aug 2020 01:28:03 +0200
Subject: [PATCH 1/2] docs: consistent markup for OpenSSL and SSL, v9

OpenSSL was mostly referred to with the "productname" tag, but also
with "application" as well without any markup at all. This moves to
using "productname" for all mentions as well as using "acronym" on
most mentions of SSL and its concepts.
---
 doc/src/sgml/config.sgml   |  6 +++---
 doc/src/sgml/libpq.sgml    | 24 ++++++++++++------------
 doc/src/sgml/pgcrypto.sgml |  8 ++++----
 doc/src/sgml/sslinfo.sgml  |  2 +-
 4 files changed, 20 insertions(+), 20 deletions(-)

diff --git a/doc/src/sgml/config.sgml b/doc/src/sgml/config.sgml
index 606e80df0e..032232e5d7 100644
--- a/doc/src/sgml/config.sgml
+++ b/doc/src/sgml/config.sgml
@@ -1261,7 +1261,7 @@ include_dir 'conf.d'
           <term><literal>+3DES</literal></term>
           <listitem>
            <para>
-            The OpenSSL default order for <literal>HIGH</literal> is problematic
+            The <productname>OpenSSL</productname> default order for <literal>HIGH</literal> is problematic
             because it orders 3DES higher than AES128.  This is wrong because
             3DES offers less security than AES128, and it is also much
             slower.  <literal>+3DES</literal> reorders it after all other
@@ -1284,7 +1284,7 @@ include_dir 'conf.d'
        </para>
 
        <para>
-        Available cipher suite details will vary across OpenSSL versions.  Use
+        Available cipher suite details will vary across <productname>OpenSSL</productname> versions.  Use
         the command
         <literal>openssl ciphers -v 'HIGH:MEDIUM:+3DES:!aNULL'</literal> to
         see actual details for the currently installed <application>OpenSSL</application>
@@ -1337,7 +1337,7 @@ include_dir 'conf.d'
        </para>
 
        <para>
-        OpenSSL names for the most common curves are:
+        <productname>OpenSSL</productname> names for the most common curves are:
         <literal>prime256v1</literal> (NIST P-256),
         <literal>secp384r1</literal> (NIST P-384),
         <literal>secp521r1</literal> (NIST P-521).
diff --git a/doc/src/sgml/libpq.sgml b/doc/src/sgml/libpq.sgml
index a397073526..b932fdbaae 100644
--- a/doc/src/sgml/libpq.sgml
+++ b/doc/src/sgml/libpq.sgml
@@ -812,7 +812,7 @@ int callback_fn(char *buf, int size, PGconn *conn);
        its path will be in <literal>conn->sslkey</literal> when the callback
        is invoked. This will be empty if the default key path is being used.
        For keys that are engine specifiers, it is up to engine implementations
-       whether they use the OpenSSL password callback or define their own handling.
+       whether they use the <productname>OpenSSL</productname> password callback or define their own handling.
       </para>
 
       <para>
@@ -1672,13 +1672,13 @@ postgresql://%2Fvar%2Flib%2Fpostgresql/dbname
        <para>
         Specifying this parameter with any non-empty value suppresses the
         <literal>Enter PEM pass phrase:</literal>
-        prompt that OpenSSL will emit by default when an encrypted client
+        prompt that <productname>OpenSSL</productname> will emit by default when an encrypted client
         certificate key is provided to <literal>libpq</literal>.
        </para>
        <para>
         If the key is not encrypted this parameter is ignored. The parameter has no
-        effect on keys specified by OpenSSL engines unless the engine uses the
-        OpenSSL password callback mechanism for prompts.
+        effect on keys specified by <productname>OpenSSL</productname> engines unless the engine uses the
+        <productname>OpenSSL</productname> password callback mechanism for prompts.
        </para>
        <para>
         There is no environment variable equivalent to this option, and no
@@ -2471,8 +2471,8 @@ void *PQsslStruct(const PGconn *conn, const char *struct_name);
       </para>
       <para>
        The struct(s) available depend on the SSL implementation in use.
-       For OpenSSL, there is one struct, available under the name "OpenSSL",
-       and it returns a pointer to the OpenSSL <literal>SSL</literal> struct.
+       For <productname>OpenSSL</productname>, there is one struct, available under the name "OpenSSL",
+       and it returns a pointer to the <productname>OpenSSL</productname> <literal>SSL</literal> struct.
        To use this function, code along the following lines could be used:
 <programlisting><![CDATA[
 #include <libpq-fe.h>
@@ -2516,7 +2516,7 @@ void *PQgetssl(const PGconn *conn);
       <para>
        This function is equivalent to <literal>PQsslStruct(conn, "OpenSSL")</literal>. It should
        not be used in new applications, because the returned struct is
-       specific to OpenSSL and will not be available if another SSL
+       specific to <productname>OpenSSL</productname> and will not be available if another <acronym>SSL</acronym>
        implementation is used. To check if a connection uses SSL, call
        <xref linkend="libpq-PQsslInUse"/> instead, and for more details about the
        connection, use <xref linkend="libpq-PQsslAttribute"/>.
@@ -7666,11 +7666,11 @@ ldap://ldap.acme.com/cn=dbserver,cn=hosts?pgconnectinfo?base?(objectclass=*)
   <para>
    The key may be
    stored in cleartext or encrypted with a passphrase using any algorithm supported
-   by OpenSSL, like AES-128. If the key is stored encrypted, then the passphrase
+   by <productname>OpenSSL</productname>, like AES-128. If the key is stored encrypted, then the passphrase
    may be provided in the <xref linkend="libpq-connect-sslpassword"/> connection
    option. If an encrypted key is supplied and the <literal>sslpassword</literal>
    option is absent or blank, a password will be prompted for interactively by
-   OpenSSL with a <literal>Enter PEM pass phrase:</literal>
+   <productname>OpenSSL</productname> with a <literal>Enter PEM pass phrase:</literal>
    prompt if a TTY is available. Applications can override the client certificate
    prompt and the handling of the <literal>sslpassword</literal> parameter by supplying
    their own key password callback; see
@@ -7936,7 +7936,7 @@ void PQinitOpenSSL(int do_ssl, int do_crypto);
 
       <para>
        When <parameter>do_ssl</parameter> is non-zero, <application>libpq</application>
-       will initialize the <application>OpenSSL</application> library before first
+       will initialize the <productname>OpenSSL</productname> library before first
        opening a database connection.  When <parameter>do_crypto</parameter> is
        non-zero, the <literal>libcrypto</literal> library will be initialized.  By
        default (if <xref linkend="libpq-PQinitOpenSSL"/> is not called), both libraries
@@ -7945,7 +7945,7 @@ void PQinitOpenSSL(int do_ssl, int do_crypto);
       </para>
 
       <para>
-       If your application uses and initializes either <application>OpenSSL</application>
+       If your application uses and initializes either <productname>OpenSSL</productname>
        or its underlying <literal>libcrypto</literal> library, you <emphasis>must</emphasis>
        call this function with zeroes for the appropriate parameter(s)
        before first opening a database connection.  Also be sure that you
@@ -7967,7 +7967,7 @@ void PQinitSSL(int do_ssl);
        This function is equivalent to
        <literal>PQinitOpenSSL(do_ssl, do_ssl)</literal>.
        It is sufficient for applications that initialize both or neither
-       of <application>OpenSSL</application> and <literal>libcrypto</literal>.
+       of <productname>OpenSSL</productname> and <literal>libcrypto</literal>.
       </para>
 
       <para>
diff --git a/doc/src/sgml/pgcrypto.sgml b/doc/src/sgml/pgcrypto.sgml
index 6fd645aa70..36ba7b4041 100644
--- a/doc/src/sgml/pgcrypto.sgml
+++ b/doc/src/sgml/pgcrypto.sgml
@@ -45,7 +45,7 @@ digest(data bytea, type text) returns bytea
     <literal>sha224</literal>, <literal>sha256</literal>,
     <literal>sha384</literal> and <literal>sha512</literal>.
     If <filename>pgcrypto</filename> was built with
-    OpenSSL, more algorithms are available, as detailed in
+    <productname>OpenSSL</productname>, more algorithms are available, as detailed in
     <xref linkend="pgcrypto-with-without-openssl"/>.
    </para>
 
@@ -1162,8 +1162,8 @@ gen_random_uuid() returns uuid
    </para>
 
    <para>
-    When compiled with OpenSSL, there will be more algorithms available.
-    Also public-key encryption functions will be faster as OpenSSL
+    When compiled with <productname>OpenSSL</productname>, there will be more algorithms available.
+    Also public-key encryption functions will be faster as <productname>OpenSSL</productname>
     has more optimized BIGNUM functions.
    </para>
 
@@ -1239,7 +1239,7 @@ gen_random_uuid() returns uuid
    <orderedlist>
     <listitem>
      <para>
-      Any digest algorithm OpenSSL supports is automatically picked up.
+      Any digest algorithm <productname>OpenSSL</productname> supports is automatically picked up.
       This is not possible with ciphers, which need to be supported
       explicitly.
      </para>
diff --git a/doc/src/sgml/sslinfo.sgml b/doc/src/sgml/sslinfo.sgml
index 7d3fcb7167..195949f55a 100644
--- a/doc/src/sgml/sslinfo.sgml
+++ b/doc/src/sgml/sslinfo.sgml
@@ -174,7 +174,7 @@
      This function returns the value of the specified field in the
      certificate subject, or NULL if the field is not present.
      Field names are string constants that are
-     converted into ASN1 object identifiers using the OpenSSL object
+     converted into ASN1 object identifiers using the <productname>OpenSSL</productname> object
      database.  The following values are acceptable:
     </para>
 <literallayout class="monospaced">
-- 
2.21.1 (Apple Git-122.3)

From bb4928ad54bd46d34ccc3d3101e965ba5e157262 Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Sat, 29 Aug 2020 01:24:10 +0200
Subject: [PATCH 2/2] Support for NSS as a TLS backend v9

Daniel Gustafsson, Andrew Dunstan
---
 configure                                     |  211 ++++
 configure.ac                                  |   30 +
 contrib/Makefile                              |    2 +-
 .../postgres_fdw/expected/postgres_fdw.out    |    2 +-
 contrib/sslinfo/sslinfo.c                     |  164 ++-
 doc/src/sgml/acronyms.sgml                    |   43 +
 doc/src/sgml/config.sgml                      |   21 +-
 doc/src/sgml/installation.sgml                |   30 +-
 doc/src/sgml/libpq.sgml                       |   27 +-
 doc/src/sgml/runtime.sgml                     |   78 +-
 doc/src/sgml/sslinfo.sgml                     |   14 +-
 src/Makefile.global.in                        |   10 +
 src/backend/libpq/Makefile                    |    4 +
 src/backend/libpq/auth.c                      |    7 +
 src/backend/libpq/be-secure-nss.c             | 1038 +++++++++++++++++
 src/backend/libpq/be-secure-openssl.c         |   16 +-
 src/backend/libpq/be-secure.c                 |    3 +
 src/backend/utils/misc/guc.c                  |   20 +-
 src/include/common/pg_nss.h                   |  141 +++
 src/include/libpq/libpq-be.h                  |    9 +-
 src/include/libpq/libpq.h                     |    3 +
 src/include/pg_config.h.in                    |    3 +
 src/include/pg_config_manual.h                |    5 +-
 src/interfaces/libpq/Makefile                 |    4 +
 src/interfaces/libpq/fe-connect.c             |    4 +
 src/interfaces/libpq/fe-secure-nss.c          |  984 ++++++++++++++++
 src/interfaces/libpq/fe-secure.c              |    5 +-
 src/interfaces/libpq/libpq-fe.h               |   11 +
 src/interfaces/libpq/libpq-int.h              |    5 +
 src/test/Makefile                             |    2 +-
 src/test/ssl/Makefile                         |  172 +++
 .../cert9.db                                  |  Bin 0 -> 36864 bytes
 .../key4.db                                   |  Bin 0 -> 36864 bytes
 .../pkcs11.txt                                |    5 +
 src/test/ssl/ssl/nss/client-encrypted-pem.pfx |  Bin 0 -> 3149 bytes
 .../cert9.db                                  |  Bin 0 -> 28672 bytes
 .../key4.db                                   |  Bin 0 -> 36864 bytes
 .../pkcs11.txt                                |    5 +
 src/test/ssl/ssl/nss/client-revoked.pfx       |  Bin 0 -> 3149 bytes
 src/test/ssl/ssl/nss/client.crl               |  Bin 0 -> 418 bytes
 ...ient.crt__client-encrypted-pem.key.db.pass |    1 +
 .../cert9.db                                  |  Bin 0 -> 36864 bytes
 .../key4.db                                   |  Bin 0 -> 45056 bytes
 .../pkcs11.txt                                |    5 +
 .../nss/client.crt__client.key.db/cert9.db    |  Bin 0 -> 36864 bytes
 .../ssl/nss/client.crt__client.key.db/key4.db |  Bin 0 -> 45056 bytes
 .../nss/client.crt__client.key.db/pkcs11.txt  |    5 +
 src/test/ssl/ssl/nss/client.pfx               |  Bin 0 -> 3149 bytes
 .../ssl/ssl/nss/client_ca.crt.db/cert9.db     |  Bin 0 -> 28672 bytes
 src/test/ssl/ssl/nss/client_ca.crt.db/key4.db |  Bin 0 -> 36864 bytes
 .../ssl/ssl/nss/client_ca.crt.db/pkcs11.txt   |    5 +
 src/test/ssl/ssl/nss/root+client.crl          |  Bin 0 -> 393 bytes
 .../ssl/nss/root+client_ca.crt.db/cert9.db    |  Bin 0 -> 28672 bytes
 .../ssl/ssl/nss/root+client_ca.crt.db/key4.db |  Bin 0 -> 36864 bytes
 .../ssl/nss/root+client_ca.crt.db/pkcs11.txt  |    5 +
 .../ssl/nss/root+server_ca.crt.db/cert9.db    |  Bin 0 -> 28672 bytes
 .../ssl/ssl/nss/root+server_ca.crt.db/key4.db |  Bin 0 -> 36864 bytes
 .../ssl/nss/root+server_ca.crt.db/pkcs11.txt  |    5 +
 .../cert9.db                                  |  Bin 0 -> 28672 bytes
 .../key4.db                                   |  Bin 0 -> 36864 bytes
 .../pkcs11.txt                                |    5 +
 .../cert9.db                                  |  Bin 0 -> 28672 bytes
 .../root+server_ca.crt__server.crl.db/key4.db |  Bin 0 -> 36864 bytes
 .../pkcs11.txt                                |    5 +
 src/test/ssl/ssl/nss/root.crl                 |  Bin 0 -> 393 bytes
 .../cert9.db                                  |  Bin 0 -> 36864 bytes
 .../key4.db                                   |  Bin 0 -> 45056 bytes
 .../pkcs11.txt                                |    5 +
 .../ssl/ssl/nss/server-cn-and-alt-names.pfx   |  Bin 0 -> 3349 bytes
 .../cert9.db                                  |  Bin 0 -> 28672 bytes
 .../key4.db                                   |  Bin 0 -> 36864 bytes
 .../pkcs11.txt                                |    5 +
 .../cert9.db                                  |  Bin 0 -> 36864 bytes
 .../key4.db                                   |  Bin 0 -> 45056 bytes
 .../pkcs11.txt                                |    5 +
 src/test/ssl/ssl/nss/server-cn-only.pfx       |  Bin 0 -> 3197 bytes
 .../cert9.db                                  |  Bin 0 -> 36864 bytes
 .../key4.db                                   |  Bin 0 -> 45056 bytes
 .../pkcs11.txt                                |    5 +
 .../ssl/ssl/nss/server-multiple-alt-names.pfx |  Bin 0 -> 3325 bytes
 .../cert9.db                                  |  Bin 0 -> 36864 bytes
 .../key4.db                                   |  Bin 0 -> 45056 bytes
 .../pkcs11.txt                                |    5 +
 src/test/ssl/ssl/nss/server-no-names.pfx      |  Bin 0 -> 3109 bytes
 src/test/ssl/ssl/nss/server-password.pfx      |  Bin 0 -> 3197 bytes
 .../cert9.db                                  |  Bin 0 -> 36864 bytes
 .../key4.db                                   |  Bin 0 -> 45056 bytes
 .../pkcs11.txt                                |    5 +
 src/test/ssl/ssl/nss/server-revoked.pfx       |  Bin 0 -> 3181 bytes
 .../cert9.db                                  |  Bin 0 -> 36864 bytes
 .../key4.db                                   |  Bin 0 -> 45056 bytes
 .../pkcs11.txt                                |    5 +
 .../ssl/ssl/nss/server-single-alt-name.pfx    |  Bin 0 -> 3213 bytes
 src/test/ssl/ssl/nss/server.crl               |  Bin 0 -> 418 bytes
 .../ssl/ssl/nss/server_ca.crt.db/cert9.db     |  Bin 0 -> 28672 bytes
 src/test/ssl/ssl/nss/server_ca.crt.db/key4.db |  Bin 0 -> 36864 bytes
 .../ssl/ssl/nss/server_ca.crt.db/pkcs11.txt   |    5 +
 src/test/ssl/t/001_ssltests.pl                |  289 ++---
 src/test/ssl/t/002_scram.pl                   |    4 +-
 src/test/ssl/t/SSL/Backend/NSS.pm             |   64 +
 src/test/ssl/t/SSL/Backend/OpenSSL.pm         |  103 ++
 .../ssl/t/{SSLServer.pm => SSL/Server.pm}     |   80 +-
 src/tools/msvc/Install.pm                     |    3 +-
 src/tools/msvc/Mkvcbuild.pm                   |   29 +-
 src/tools/msvc/Solution.pm                    |   20 +
 src/tools/msvc/config_default.pl              |    1 +
 106 files changed, 3481 insertions(+), 266 deletions(-)
 create mode 100644 src/backend/libpq/be-secure-nss.c
 create mode 100644 src/include/common/pg_nss.h
 create mode 100644 src/interfaces/libpq/fe-secure-nss.c
 create mode 100644 src/test/ssl/ssl/nss/client+client_ca.crt__client.key.db/cert9.db
 create mode 100644 src/test/ssl/ssl/nss/client+client_ca.crt__client.key.db/key4.db
 create mode 100644 src/test/ssl/ssl/nss/client+client_ca.crt__client.key.db/pkcs11.txt
 create mode 100644 src/test/ssl/ssl/nss/client-encrypted-pem.pfx
 create mode 100644 src/test/ssl/ssl/nss/client-revoked.crt__client-revoked.key.db/cert9.db
 create mode 100644 src/test/ssl/ssl/nss/client-revoked.crt__client-revoked.key.db/key4.db
 create mode 100644 src/test/ssl/ssl/nss/client-revoked.crt__client-revoked.key.db/pkcs11.txt
 create mode 100644 src/test/ssl/ssl/nss/client-revoked.pfx
 create mode 100644 src/test/ssl/ssl/nss/client.crl
 create mode 100644 src/test/ssl/ssl/nss/client.crt__client-encrypted-pem.key.db.pass
 create mode 100644 src/test/ssl/ssl/nss/client.crt__client-encrypted-pem.key.db/cert9.db
 create mode 100644 src/test/ssl/ssl/nss/client.crt__client-encrypted-pem.key.db/key4.db
 create mode 100644 src/test/ssl/ssl/nss/client.crt__client-encrypted-pem.key.db/pkcs11.txt
 create mode 100644 src/test/ssl/ssl/nss/client.crt__client.key.db/cert9.db
 create mode 100644 src/test/ssl/ssl/nss/client.crt__client.key.db/key4.db
 create mode 100644 src/test/ssl/ssl/nss/client.crt__client.key.db/pkcs11.txt
 create mode 100644 src/test/ssl/ssl/nss/client.pfx
 create mode 100644 src/test/ssl/ssl/nss/client_ca.crt.db/cert9.db
 create mode 100644 src/test/ssl/ssl/nss/client_ca.crt.db/key4.db
 create mode 100644 src/test/ssl/ssl/nss/client_ca.crt.db/pkcs11.txt
 create mode 100644 src/test/ssl/ssl/nss/root+client.crl
 create mode 100644 src/test/ssl/ssl/nss/root+client_ca.crt.db/cert9.db
 create mode 100644 src/test/ssl/ssl/nss/root+client_ca.crt.db/key4.db
 create mode 100644 src/test/ssl/ssl/nss/root+client_ca.crt.db/pkcs11.txt
 create mode 100644 src/test/ssl/ssl/nss/root+server_ca.crt.db/cert9.db
 create mode 100644 src/test/ssl/ssl/nss/root+server_ca.crt.db/key4.db
 create mode 100644 src/test/ssl/ssl/nss/root+server_ca.crt.db/pkcs11.txt
 create mode 100644 src/test/ssl/ssl/nss/root+server_ca.crt__root+server.crl.db/cert9.db
 create mode 100644 src/test/ssl/ssl/nss/root+server_ca.crt__root+server.crl.db/key4.db
 create mode 100644 src/test/ssl/ssl/nss/root+server_ca.crt__root+server.crl.db/pkcs11.txt
 create mode 100644 src/test/ssl/ssl/nss/root+server_ca.crt__server.crl.db/cert9.db
 create mode 100644 src/test/ssl/ssl/nss/root+server_ca.crt__server.crl.db/key4.db
 create mode 100644 src/test/ssl/ssl/nss/root+server_ca.crt__server.crl.db/pkcs11.txt
 create mode 100644 src/test/ssl/ssl/nss/root.crl
 create mode 100644 src/test/ssl/ssl/nss/server-cn-and-alt-names.crt__server-cn-and-alt-names.key.db/cert9.db
 create mode 100644 src/test/ssl/ssl/nss/server-cn-and-alt-names.crt__server-cn-and-alt-names.key.db/key4.db
 create mode 100644 src/test/ssl/ssl/nss/server-cn-and-alt-names.crt__server-cn-and-alt-names.key.db/pkcs11.txt
 create mode 100644 src/test/ssl/ssl/nss/server-cn-and-alt-names.pfx
 create mode 100644 src/test/ssl/ssl/nss/server-cn-only.crt__server-cn-only.key.db/cert9.db
 create mode 100644 src/test/ssl/ssl/nss/server-cn-only.crt__server-cn-only.key.db/key4.db
 create mode 100644 src/test/ssl/ssl/nss/server-cn-only.crt__server-cn-only.key.db/pkcs11.txt
 create mode 100644 src/test/ssl/ssl/nss/server-cn-only.crt__server-password.key.db/cert9.db
 create mode 100644 src/test/ssl/ssl/nss/server-cn-only.crt__server-password.key.db/key4.db
 create mode 100644 src/test/ssl/ssl/nss/server-cn-only.crt__server-password.key.db/pkcs11.txt
 create mode 100644 src/test/ssl/ssl/nss/server-cn-only.pfx
 create mode 100644 src/test/ssl/ssl/nss/server-multiple-alt-names.crt__server-multiple-alt-names.key.db/cert9.db
 create mode 100644 src/test/ssl/ssl/nss/server-multiple-alt-names.crt__server-multiple-alt-names.key.db/key4.db
 create mode 100644 src/test/ssl/ssl/nss/server-multiple-alt-names.crt__server-multiple-alt-names.key.db/pkcs11.txt
 create mode 100644 src/test/ssl/ssl/nss/server-multiple-alt-names.pfx
 create mode 100644 src/test/ssl/ssl/nss/server-no-names.crt__server-no-names.key.db/cert9.db
 create mode 100644 src/test/ssl/ssl/nss/server-no-names.crt__server-no-names.key.db/key4.db
 create mode 100644 src/test/ssl/ssl/nss/server-no-names.crt__server-no-names.key.db/pkcs11.txt
 create mode 100644 src/test/ssl/ssl/nss/server-no-names.pfx
 create mode 100644 src/test/ssl/ssl/nss/server-password.pfx
 create mode 100644 src/test/ssl/ssl/nss/server-revoked.crt__server-revoked.key.db/cert9.db
 create mode 100644 src/test/ssl/ssl/nss/server-revoked.crt__server-revoked.key.db/key4.db
 create mode 100644 src/test/ssl/ssl/nss/server-revoked.crt__server-revoked.key.db/pkcs11.txt
 create mode 100644 src/test/ssl/ssl/nss/server-revoked.pfx
 create mode 100644 src/test/ssl/ssl/nss/server-single-alt-name.crt__server-single-alt-name.key.db/cert9.db
 create mode 100644 src/test/ssl/ssl/nss/server-single-alt-name.crt__server-single-alt-name.key.db/key4.db
 create mode 100644 src/test/ssl/ssl/nss/server-single-alt-name.crt__server-single-alt-name.key.db/pkcs11.txt
 create mode 100644 src/test/ssl/ssl/nss/server-single-alt-name.pfx
 create mode 100644 src/test/ssl/ssl/nss/server.crl
 create mode 100644 src/test/ssl/ssl/nss/server_ca.crt.db/cert9.db
 create mode 100644 src/test/ssl/ssl/nss/server_ca.crt.db/key4.db
 create mode 100644 src/test/ssl/ssl/nss/server_ca.crt.db/pkcs11.txt
 create mode 100644 src/test/ssl/t/SSL/Backend/NSS.pm
 create mode 100644 src/test/ssl/t/SSL/Backend/OpenSSL.pm
 rename src/test/ssl/t/{SSLServer.pm => SSL/Server.pm} (78%)

diff --git a/configure b/configure
index cb8fbe1051..8b7d98c2ab 100755
--- a/configure
+++ b/configure
@@ -711,6 +711,7 @@ with_uuid
 with_readline
 with_systemd
 with_selinux
+with_nss
 with_openssl
 with_ldap
 with_krb_srvnam
@@ -856,6 +857,7 @@ with_bsd_auth
 with_ldap
 with_bonjour
 with_openssl
+with_nss
 with_selinux
 with_systemd
 with_readline
@@ -1558,6 +1560,7 @@ Optional Packages:
   --with-ldap             build with LDAP support
   --with-bonjour          build with Bonjour support
   --with-openssl          build with OpenSSL support
+  --with-nss              build with NSS support
   --with-selinux          build with SELinux support
   --with-systemd          build with systemd support
   --without-readline      do not use GNU Readline nor BSD Libedit for editing
@@ -8100,6 +8103,41 @@ fi
 $as_echo "$with_openssl" >&6; }
 
 
+#
+# LibNSS
+#
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether to build with NSS support" >&5
+$as_echo_n "checking whether to build with NSS support... " >&6; }
+
+
+
+# Check whether --with-nss was given.
+if test "${with_nss+set}" = set; then :
+  withval=$with_nss;
+  case $withval in
+    yes)
+
+$as_echo "#define USE_NSS 1" >>confdefs.h
+
+      ;;
+    no)
+      :
+      ;;
+    *)
+      as_fn_error $? "no argument expected for --with-nss option" "$LINENO" 5
+      ;;
+  esac
+
+else
+  with_nss=no
+
+fi
+
+
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $with_nss" >&5
+$as_echo "$with_nss" >&6; }
+
+
 #
 # SELinux
 #
@@ -12174,6 +12212,9 @@ fi
 fi
 
 if test "$with_openssl" = yes ; then
+  if test x"$with_nss" = x"yes" ; then
+    as_fn_error $? "multiple SSL backends cannot be enabled simultaneously\"" "$LINENO" 5
+  fi
     # Minimum required OpenSSL version is 1.0.1
 
 $as_echo "#define OPENSSL_API_COMPAT 0x10001000L" >>confdefs.h
@@ -12436,6 +12477,157 @@ done
 
 fi
 
+if test "$with_nss" = yes ; then
+  if test x"$with_openssl" = x"yes" ; then
+    as_fn_error $? "multiple SSL backends cannot be enabled simultaneously\"" "$LINENO" 5
+  fi
+  CLEANLDFLAGS="$LDFLAGS"
+  # TODO: document this set of LDFLAGS
+  LDFLAGS="-lssl3 -lsmime3 -lnss3 -lplds4 -lplc4 -lnspr4 $LDFLAGS"
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for SSL_VersionRangeSet in -lnss3" >&5
+$as_echo_n "checking for SSL_VersionRangeSet in -lnss3... " >&6; }
+if ${ac_cv_lib_nss3_SSL_VersionRangeSet+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lnss3  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char SSL_VersionRangeSet ();
+int
+main ()
+{
+return SSL_VersionRangeSet ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_lib_nss3_SSL_VersionRangeSet=yes
+else
+  ac_cv_lib_nss3_SSL_VersionRangeSet=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_nss3_SSL_VersionRangeSet" >&5
+$as_echo "$ac_cv_lib_nss3_SSL_VersionRangeSet" >&6; }
+if test "x$ac_cv_lib_nss3_SSL_VersionRangeSet" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_LIBNSS3 1
+_ACEOF
+
+  LIBS="-lnss3 $LIBS"
+
+else
+  as_fn_error $? "library 'nss3' is required for NSS" "$LINENO" 5
+fi
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for PR_GetDefaultIOMethods in -lnspr4" >&5
+$as_echo_n "checking for PR_GetDefaultIOMethods in -lnspr4... " >&6; }
+if ${ac_cv_lib_nspr4_PR_GetDefaultIOMethods+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lnspr4  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char PR_GetDefaultIOMethods ();
+int
+main ()
+{
+return PR_GetDefaultIOMethods ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_lib_nspr4_PR_GetDefaultIOMethods=yes
+else
+  ac_cv_lib_nspr4_PR_GetDefaultIOMethods=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_nspr4_PR_GetDefaultIOMethods" >&5
+$as_echo "$ac_cv_lib_nspr4_PR_GetDefaultIOMethods" >&6; }
+if test "x$ac_cv_lib_nspr4_PR_GetDefaultIOMethods" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_LIBNSPR4 1
+_ACEOF
+
+  LIBS="-lnspr4 $LIBS"
+
+else
+  as_fn_error $? "library 'nspr4' is required for NSS" "$LINENO" 5
+fi
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for SSL_GetImplementedCiphers in -lssl3" >&5
+$as_echo_n "checking for SSL_GetImplementedCiphers in -lssl3... " >&6; }
+if ${ac_cv_lib_ssl3_SSL_GetImplementedCiphers+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lssl3  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char SSL_GetImplementedCiphers ();
+int
+main ()
+{
+return SSL_GetImplementedCiphers ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_lib_ssl3_SSL_GetImplementedCiphers=yes
+else
+  ac_cv_lib_ssl3_SSL_GetImplementedCiphers=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_ssl3_SSL_GetImplementedCiphers" >&5
+$as_echo "$ac_cv_lib_ssl3_SSL_GetImplementedCiphers" >&6; }
+if test "x$ac_cv_lib_ssl3_SSL_GetImplementedCiphers" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_LIBSSL3 1
+_ACEOF
+
+  LIBS="-lssl3 $LIBS"
+
+else
+  as_fn_error $? "library 'ssl3' is required for NSS" "$LINENO" 5
+fi
+
+  LDFLAGS="$CLEANLDFLAGS"
+fi
+
 if test "$with_pam" = yes ; then
   { $as_echo "$as_me:${as_lineno-$LINENO}: checking for pam_start in -lpam" >&5
 $as_echo_n "checking for pam_start in -lpam... " >&6; }
@@ -13338,6 +13530,25 @@ else
 fi
 
 
+fi
+
+if test "$with_nss" = yes ; then
+  ac_fn_c_check_header_mongrel "$LINENO" "ssl.h" "ac_cv_header_ssl_h" "$ac_includes_default"
+if test "x$ac_cv_header_ssl_h" = xyes; then :
+
+else
+  as_fn_error $? "header file <ssl.h> is required for NSS" "$LINENO" 5
+fi
+
+
+  ac_fn_c_check_header_mongrel "$LINENO" "nss.h" "ac_cv_header_nss_h" "$ac_includes_default"
+if test "x$ac_cv_header_nss_h" = xyes; then :
+
+else
+  as_fn_error $? "header file <nss.h> is required for NSS" "$LINENO" 5
+fi
+
+
 fi
 
 if test "$with_pam" = yes ; then
diff --git a/configure.ac b/configure.ac
index eb2c731b58..23c07cabce 100644
--- a/configure.ac
+++ b/configure.ac
@@ -856,6 +856,15 @@ PGAC_ARG_BOOL(with, openssl, no, [build with OpenSSL support],
 AC_MSG_RESULT([$with_openssl])
 AC_SUBST(with_openssl)
 
+#
+# LibNSS
+#
+AC_MSG_CHECKING([whether to build with NSS support])
+PGAC_ARG_BOOL(with, nss, no, [build with NSS support],
+              [AC_DEFINE([USE_NSS], 1, [Define to build with NSS support. (--with-nss)])])
+AC_MSG_RESULT([$with_nss])
+AC_SUBST(with_nss)
+
 #
 # SELinux
 #
@@ -1205,6 +1214,9 @@ if test "$with_gssapi" = yes ; then
 fi
 
 if test "$with_openssl" = yes ; then
+  if test x"$with_nss" = x"yes" ; then
+    AC_MSG_ERROR([multiple SSL backends cannot be enabled simultaneously"])
+  fi
   dnl Order matters!
   # Minimum required OpenSSL version is 1.0.1
   AC_DEFINE(OPENSSL_API_COMPAT, [0x10001000L],
@@ -1230,6 +1242,19 @@ if test "$with_openssl" = yes ; then
   AC_CHECK_FUNCS([CRYPTO_lock])
 fi
 
+if test "$with_nss" = yes ; then
+  if test x"$with_openssl" = x"yes" ; then
+    AC_MSG_ERROR([multiple SSL backends cannot be enabled simultaneously"])
+  fi
+  CLEANLDFLAGS="$LDFLAGS"
+  # TODO: document this set of LDFLAGS
+  LDFLAGS="-lssl3 -lsmime3 -lnss3 -lplds4 -lplc4 -lnspr4 $LDFLAGS"
+  AC_CHECK_LIB(nss3, SSL_VersionRangeSet, [], [AC_MSG_ERROR([library 'nss3' is required for NSS])])
+  AC_CHECK_LIB(nspr4, PR_GetDefaultIOMethods, [], [AC_MSG_ERROR([library 'nspr4' is required for NSS])])
+  AC_CHECK_LIB(ssl3, SSL_GetImplementedCiphers, [], [AC_MSG_ERROR([library 'ssl3' is required for NSS])])
+  LDFLAGS="$CLEANLDFLAGS"
+fi
+
 if test "$with_pam" = yes ; then
   AC_CHECK_LIB(pam,    pam_start, [], [AC_MSG_ERROR([library 'pam' is required for PAM])])
 fi
@@ -1405,6 +1430,11 @@ if test "$with_openssl" = yes ; then
   AC_CHECK_HEADER(openssl/err.h, [], [AC_MSG_ERROR([header file <openssl/err.h> is required for OpenSSL])])
 fi
 
+if test "$with_nss" = yes ; then
+  AC_CHECK_HEADER(ssl.h, [], [AC_MSG_ERROR([header file <ssl.h> is required for NSS])])
+  AC_CHECK_HEADER(nss.h, [], [AC_MSG_ERROR([header file <nss.h> is required for NSS])])
+fi
+
 if test "$with_pam" = yes ; then
   AC_CHECK_HEADERS(security/pam_appl.h, [],
                    [AC_CHECK_HEADERS(pam/pam_appl.h, [],
diff --git a/contrib/Makefile b/contrib/Makefile
index 1846d415b6..cef7bf7f61 100644
--- a/contrib/Makefile
+++ b/contrib/Makefile
@@ -50,7 +50,7 @@ SUBDIRS = \
 		unaccent	\
 		vacuumlo
 
-ifeq ($(with_openssl),yes)
+ifeq ($(with_ssl),yes)
 SUBDIRS += sslinfo
 else
 ALWAYS_SUBDIRS += sslinfo
diff --git a/contrib/postgres_fdw/expected/postgres_fdw.out b/contrib/postgres_fdw/expected/postgres_fdw.out
index 90db550b92..961cb56358 100644
--- a/contrib/postgres_fdw/expected/postgres_fdw.out
+++ b/contrib/postgres_fdw/expected/postgres_fdw.out
@@ -8898,7 +8898,7 @@ DO $d$
     END;
 $d$;
 ERROR:  invalid option "password"
-HINT:  Valid options in this context are: service, passfile, channel_binding, connect_timeout, dbname, host, hostaddr, port, options, application_name, keepalives, keepalives_idle, keepalives_interval, keepalives_count, tcp_user_timeout, sslmode, sslcompression, sslcert, sslkey, sslrootcert, sslcrl, requirepeer, ssl_min_protocol_version, ssl_max_protocol_version, gssencmode, krbsrvname, gsslib, target_session_attrs, use_remote_estimate, fdw_startup_cost, fdw_tuple_cost, extensions, updatable, fetch_size
+HINT:  Valid options in this context are: service, passfile, channel_binding, connect_timeout, dbname, host, hostaddr, port, options, application_name, keepalives, keepalives_idle, keepalives_interval, keepalives_count, tcp_user_timeout, sslmode, sslcompression, sslcert, sslkey, sslrootcert, sslcrl, requirepeer, ssl_min_protocol_version, ssl_max_protocol_version, gssencmode, krbsrvname, gsslib, target_session_attrs, cert_database, use_remote_estimate, fdw_startup_cost, fdw_tuple_cost, extensions, updatable, fetch_size
 CONTEXT:  SQL statement "ALTER SERVER loopback_nopw OPTIONS (ADD password 'dummypw')"
 PL/pgSQL function inline_code_block line 3 at EXECUTE
 -- If we add a password for our user mapping instead, we should get a different
diff --git a/contrib/sslinfo/sslinfo.c b/contrib/sslinfo/sslinfo.c
index 5ba3988e27..84bb2c65b8 100644
--- a/contrib/sslinfo/sslinfo.c
+++ b/contrib/sslinfo/sslinfo.c
@@ -9,9 +9,11 @@
 
 #include "postgres.h"
 
+#ifdef USE_OPENSSL
 #include <openssl/x509.h>
 #include <openssl/x509v3.h>
 #include <openssl/asn1.h>
+#endif
 
 #include "access/htup_details.h"
 #include "funcapi.h"
@@ -21,8 +23,8 @@
 
 PG_MODULE_MAGIC;
 
+#ifdef USE_OPENSSL
 static Datum X509_NAME_field_to_text(X509_NAME *name, text *fieldName);
-static Datum X509_NAME_to_text(X509_NAME *name);
 static Datum ASN1_STRING_to_text(ASN1_STRING *str);
 
 /*
@@ -32,6 +34,7 @@ typedef struct
 {
 	TupleDesc	tupdesc;
 } SSLExtensionInfoContext;
+#endif
 
 /*
  * Indicates whether current session uses SSL
@@ -54,9 +57,16 @@ PG_FUNCTION_INFO_V1(ssl_version);
 Datum
 ssl_version(PG_FUNCTION_ARGS)
 {
-	if (MyProcPort->ssl == NULL)
+	const char *version;
+
+	if (!MyProcPort->ssl_in_use)
+		PG_RETURN_NULL();
+
+	version = be_tls_get_version(MyProcPort);
+	if (version == NULL)
 		PG_RETURN_NULL();
-	PG_RETURN_TEXT_P(cstring_to_text(SSL_get_version(MyProcPort->ssl)));
+
+	PG_RETURN_TEXT_P(cstring_to_text(version));
 }
 
 
@@ -67,9 +77,16 @@ PG_FUNCTION_INFO_V1(ssl_cipher);
 Datum
 ssl_cipher(PG_FUNCTION_ARGS)
 {
-	if (MyProcPort->ssl == NULL)
+	const char *cipher;
+
+	if (!MyProcPort->ssl_in_use)
 		PG_RETURN_NULL();
-	PG_RETURN_TEXT_P(cstring_to_text(SSL_get_cipher(MyProcPort->ssl)));
+
+	cipher = be_tls_get_cipher(MyProcPort);
+	if (cipher == NULL)
+		PG_RETURN_NULL();
+
+	PG_RETURN_TEXT_P(cstring_to_text(cipher));
 }
 
 
@@ -83,7 +100,7 @@ PG_FUNCTION_INFO_V1(ssl_client_cert_present);
 Datum
 ssl_client_cert_present(PG_FUNCTION_ARGS)
 {
-	PG_RETURN_BOOL(MyProcPort->peer != NULL);
+	PG_RETURN_BOOL(MyProcPort->peer_cert_valid);
 }
 
 
@@ -99,29 +116,26 @@ PG_FUNCTION_INFO_V1(ssl_client_serial);
 Datum
 ssl_client_serial(PG_FUNCTION_ARGS)
 {
+	char decimal[NAMEDATALEN];
 	Datum		result;
-	Port	   *port = MyProcPort;
-	X509	   *peer = port->peer;
-	ASN1_INTEGER *serial = NULL;
-	BIGNUM	   *b;
-	char	   *decimal;
 
-	if (!peer)
+	if (!MyProcPort->ssl_in_use || !MyProcPort->peer_cert_valid)
+		PG_RETURN_NULL();
+
+	be_tls_get_peer_serial(MyProcPort, decimal, NAMEDATALEN);
+
+	if (!*decimal)
 		PG_RETURN_NULL();
-	serial = X509_get_serialNumber(peer);
-	b = ASN1_INTEGER_to_BN(serial, NULL);
-	decimal = BN_bn2dec(b);
 
-	BN_free(b);
 	result = DirectFunctionCall3(numeric_in,
 								 CStringGetDatum(decimal),
 								 ObjectIdGetDatum(0),
 								 Int32GetDatum(-1));
-	OPENSSL_free(decimal);
 	return result;
 }
 
 
+#ifdef USE_OPENSSL
 /*
  * Converts OpenSSL ASN1_STRING structure into text
  *
@@ -228,7 +242,7 @@ ssl_client_dn_field(PG_FUNCTION_ARGS)
 	text	   *fieldname = PG_GETARG_TEXT_PP(0);
 	Datum		result;
 
-	if (!(MyProcPort->peer))
+	if (!MyProcPort->ssl_in_use || !MyProcPort->peer_cert_valid)
 		PG_RETURN_NULL();
 
 	result = X509_NAME_field_to_text(X509_get_subject_name(MyProcPort->peer), fieldname);
@@ -273,76 +287,23 @@ ssl_issuer_field(PG_FUNCTION_ARGS)
 	else
 		return result;
 }
+#endif							/* USE_OPENSSL */
 
-
-/*
- * Equivalent of X509_NAME_oneline that respects encoding
- *
- * This function converts X509_NAME structure to the text variable
- * converting all textual data into current database encoding.
- *
- * Parameter: X509_NAME *name X509_NAME structure to be converted
- *
- * Returns: text datum which contains string representation of
- * X509_NAME
- */
-static Datum
-X509_NAME_to_text(X509_NAME *name)
+#ifdef USE_NSS
+PG_FUNCTION_INFO_V1(ssl_client_dn_field);
+Datum
+ssl_client_dn_field(PG_FUNCTION_ARGS)
 {
-	BIO		   *membuf = BIO_new(BIO_s_mem());
-	int			i,
-				nid,
-				count = X509_NAME_entry_count(name);
-	X509_NAME_ENTRY *e;
-	ASN1_STRING *v;
-	const char *field_name;
-	size_t		size;
-	char		nullterm;
-	char	   *sp;
-	char	   *dp;
-	text	   *result;
-
-	if (membuf == NULL)
-		ereport(ERROR,
-				(errcode(ERRCODE_OUT_OF_MEMORY),
-				 errmsg("could not create OpenSSL BIO structure")));
-
-	(void) BIO_set_close(membuf, BIO_CLOSE);
-	for (i = 0; i < count; i++)
-	{
-		e = X509_NAME_get_entry(name, i);
-		nid = OBJ_obj2nid(X509_NAME_ENTRY_get_object(e));
-		if (nid == NID_undef)
-			ereport(ERROR,
-					(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
-					 errmsg("could not get NID for ASN1_OBJECT object")));
-		v = X509_NAME_ENTRY_get_data(e);
-		field_name = OBJ_nid2sn(nid);
-		if (field_name == NULL)
-			field_name = OBJ_nid2ln(nid);
-		if (field_name == NULL)
-			ereport(ERROR,
-					(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
-					 errmsg("could not convert NID %d to an ASN1_OBJECT structure", nid)));
-		BIO_printf(membuf, "/%s=", field_name);
-		ASN1_STRING_print_ex(membuf, v,
-							 ((ASN1_STRFLGS_RFC2253 & ~ASN1_STRFLGS_ESC_MSB)
-							  | ASN1_STRFLGS_UTF8_CONVERT));
-	}
-
-	/* ensure null termination of the BIO's content */
-	nullterm = '\0';
-	BIO_write(membuf, &nullterm, 1);
-	size = BIO_get_mem_data(membuf, &sp);
-	dp = pg_any_to_server(sp, size - 1, PG_UTF8);
-	result = cstring_to_text(dp);
-	if (dp != sp)
-		pfree(dp);
-	if (BIO_free(membuf) != 1)
-		elog(ERROR, "could not free OpenSSL BIO structure");
+	PG_RETURN_NULL();
+}
 
-	PG_RETURN_TEXT_P(result);
+PG_FUNCTION_INFO_V1(ssl_issuer_field);
+Datum
+ssl_issuer_field(PG_FUNCTION_ARGS)
+{
+	PG_RETURN_NULL();
 }
+#endif							/* USE_NSS */
 
 
 /*
@@ -358,9 +319,17 @@ PG_FUNCTION_INFO_V1(ssl_client_dn);
 Datum
 ssl_client_dn(PG_FUNCTION_ARGS)
 {
-	if (!(MyProcPort->peer))
+	char		subject[NAMEDATALEN];
+
+	if (!MyProcPort->ssl_in_use || !MyProcPort->peer_cert_valid)
+		PG_RETURN_NULL();
+
+	be_tls_get_peer_subject_name(MyProcPort, subject, NAMEDATALEN);
+
+	if (!*subject)
 		PG_RETURN_NULL();
-	return X509_NAME_to_text(X509_get_subject_name(MyProcPort->peer));
+
+	PG_RETURN_TEXT_P(cstring_to_text(subject));
 }
 
 
@@ -377,12 +346,21 @@ PG_FUNCTION_INFO_V1(ssl_issuer_dn);
 Datum
 ssl_issuer_dn(PG_FUNCTION_ARGS)
 {
-	if (!(MyProcPort->peer))
+	char		issuer[NAMEDATALEN];
+
+	if (!MyProcPort->ssl_in_use || !MyProcPort->peer_cert_valid)
+		PG_RETURN_NULL();
+
+	be_tls_get_peer_issuer_name(MyProcPort, issuer, NAMEDATALEN);
+
+	if (!*issuer)
 		PG_RETURN_NULL();
-	return X509_NAME_to_text(X509_get_issuer_name(MyProcPort->peer));
+
+	PG_RETURN_TEXT_P(cstring_to_text(issuer));
 }
 
 
+#ifdef USE_OPENSSL
 /*
  * Returns information about available SSL extensions.
  *
@@ -516,3 +494,13 @@ ssl_extension_info(PG_FUNCTION_ARGS)
 	/* All done */
 	SRF_RETURN_DONE(funcctx);
 }
+#endif							/* USE_OPENSSL */
+
+#ifdef USE_NSS
+PG_FUNCTION_INFO_V1(ssl_extension_info);
+Datum
+ssl_extension_info(PG_FUNCTION_ARGS)
+{
+	PG_RETURN_NULL();
+}
+#endif							/* USE_NSS */
diff --git a/doc/src/sgml/acronyms.sgml b/doc/src/sgml/acronyms.sgml
index 4e5ec983c0..4f6f0cf353 100644
--- a/doc/src/sgml/acronyms.sgml
+++ b/doc/src/sgml/acronyms.sgml
@@ -441,6 +441,28 @@
     </listitem>
    </varlistentry>
 
+   <varlistentry>
+    <term><acronym>NSPR</acronym></term>
+    <listitem>
+     <para>
+      <ulink
+      url="https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSPR">
+      Netscape Portable Runtime</ulink>
+     </para>
+    </listitem>
+   </varlistentry>
+
+   <varlistentry>
+    <term><acronym>NSS</acronym></term>
+    <listitem>
+     <para>
+      <ulink
+      url="https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS">
+      Network Security Services</ulink>
+     </para>
+    </listitem>
+   </varlistentry>
+
    <varlistentry>
     <term><acronym>ODBC</acronym></term>
     <listitem>
@@ -539,6 +561,17 @@
     </listitem>
    </varlistentry>
 
+   <varlistentry>
+    <term><acronym>PKCS#12</acronym></term>
+    <listitem>
+     <para>
+      <ulink
+      url="https://en.wikipedia.org/wiki/PKCS_12">
+      Public-Key Cryptography Standards #12</ulink>
+     </para>
+    </listitem>
+   </varlistentry>
+
    <varlistentry>
     <term><acronym>PL</acronym></term>
     <listitem>
@@ -684,6 +717,16 @@
     </listitem>
    </varlistentry>
 
+   <varlistentry>
+    <term><acronym>TLS</acronym></term>
+    <listitem>
+     <para>
+      <ulink url="https://sv.wikipedia.org/wiki/Transport_Layer_Security">
+      Transport Layer Security</ulink>
+     </para>
+    </listitem>
+   </varlistentry>
+
    <varlistentry>
     <term><acronym>TOAST</acronym></term>
     <listitem>
diff --git a/doc/src/sgml/config.sgml b/doc/src/sgml/config.sgml
index 032232e5d7..4aad7a5123 100644
--- a/doc/src/sgml/config.sgml
+++ b/doc/src/sgml/config.sgml
@@ -1208,6 +1208,23 @@ include_dir 'conf.d'
       </listitem>
      </varlistentry>
 
+     <varlistentry id="guc-ssl-database" xreflabel="ssl_database">
+      <term><varname>ssl_database</varname> (<type>string</type>)
+      <indexterm>
+       <primary><varname>ssl_database</varname> configuration parameter</primary>
+      </indexterm>
+      </term>
+      <listitem>
+       <para>
+        Specifies the name of the file containing the server certificates and
+        keys when using <productname>NSS</productname> for <acronym>SSL</acronym>
+        connections. This parameter can only be set in the
+        <filename>postgresql.conf</filename> file or on the server command
+        line.
+       </para>
+      </listitem>
+     </varlistentry>
+
      <varlistentry id="guc-ssl-ciphers" xreflabel="ssl_ciphers">
       <term><varname>ssl_ciphers</varname> (<type>string</type>)
       <indexterm>
@@ -1224,7 +1241,9 @@ include_dir 'conf.d'
         connections using TLS version 1.2 and lower are affected.  There is
         currently no setting that controls the cipher choices used by TLS
         version 1.3 connections.  The default value is
-        <literal>HIGH:MEDIUM:+3DES:!aNULL</literal>.  The default is usually a
+        <literal>HIGH:MEDIUM:+3DES:!aNULL</literal> for servers which have
+        been built with <productname>OpenSSL</productname> as the
+        <acronym>SSL</acronym> library.  The default is usually a
         reasonable choice unless you have specific security requirements.
        </para>
 
diff --git a/doc/src/sgml/installation.sgml b/doc/src/sgml/installation.sgml
index 552303e211..2343b5805e 100644
--- a/doc/src/sgml/installation.sgml
+++ b/doc/src/sgml/installation.sgml
@@ -250,7 +250,7 @@ su - postgres
 
     <listitem>
      <para>
-      You need <productname>OpenSSL</productname>, if you want to support
+      You need a supported <acronym>SSL</acronym> library, if you want to support
       encrypted client connections.  <productname>OpenSSL</productname> is
       also required for random number generation on platforms that do not
       have <filename>/dev/urandom</filename> (except Windows).  The minimum
@@ -969,6 +969,31 @@ build-postgresql:
        </listitem>
       </varlistentry>
 
+      <varlistentry>
+       <term><option>--with-nss</option>
+       <indexterm>
+        <primary>NSS</primary>
+        <secondary>NSPR</secondary>
+        <seealso>SSL</seealso>
+       </indexterm>
+       </term>
+       <listitem>
+        <para>
+         Build with support for <acronym>SSL</acronym> (encrypted)
+         connections using <productname>NSS</productname>. This requires the
+         <productname>NSS</productname> package to be installed. Additionally,
+         <productname>NSS</productname> requires <productname>NSPR</productname>
+         to be installed. <filename>configure</filename> will check for the
+         required header files and libraries to make sure that your
+         <productname>NSS</productname> installation is sufficient before
+         proceeding.
+        </para>
+        <para>
+         This option is incompatible with <literal>--with-openssl</literal>.
+        </para>
+       </listitem>
+      </varlistentry>
+
       <varlistentry>
        <term><option>--with-openssl</option>
        <indexterm>
@@ -985,6 +1010,9 @@ build-postgresql:
          your <productname>OpenSSL</productname> installation is sufficient
          before proceeding.
         </para>
+        <para>
+         This option is incompatible with <literal>--with-nss</literal>.
+        </para>
        </listitem>
       </varlistentry>
 
diff --git a/doc/src/sgml/libpq.sgml b/doc/src/sgml/libpq.sgml
index b932fdbaae..ce7cf7cda3 100644
--- a/doc/src/sgml/libpq.sgml
+++ b/doc/src/sgml/libpq.sgml
@@ -2471,6 +2471,8 @@ void *PQsslStruct(const PGconn *conn, const char *struct_name);
       </para>
       <para>
        The struct(s) available depend on the SSL implementation in use.
+      </para>
+      <para>
        For <productname>OpenSSL</productname>, there is one struct, available under the name "OpenSSL",
        and it returns a pointer to the <productname>OpenSSL</productname> <literal>SSL</literal> struct.
        To use this function, code along the following lines could be used:
@@ -2493,9 +2495,14 @@ void *PQsslStruct(const PGconn *conn, const char *struct_name);
 ]]></programlisting>
       </para>
       <para>
-       This structure can be used to verify encryption levels, check server
-       certificates, and more. Refer to the <productname>OpenSSL</productname>
-       documentation for information about this structure.
+       For <productname>NSS</productname>, there is one struct available under
+       the name "NSS", and it returns a pointer to the
+       <productname>NSS</productname> <literal>PRFileDesc</literal>.
+      </para>
+      <para>
+       These structures can be used to verify encryption levels, check server
+       certificates, and more. Refer to the <acronym>SSL</acronym> library
+       documentation for information about these structures.
       </para>
      </listitem>
     </varlistentry>
@@ -2521,6 +2528,10 @@ void *PQgetssl(const PGconn *conn);
        <xref linkend="libpq-PQsslInUse"/> instead, and for more details about the
        connection, use <xref linkend="libpq-PQsslAttribute"/>.
       </para>
+      <para>
+       This function returns <literal>NULL</literal> when <acronym>SSL</acronym>
+       librariaes other than <productname>OpenSSL</productname> are used.
+      </para>
      </listitem>
     </varlistentry>
 
@@ -7951,6 +7962,11 @@ void PQinitOpenSSL(int do_ssl, int do_crypto);
        before first opening a database connection.  Also be sure that you
        have done that initialization before opening a database connection.
       </para>
+
+      <para>
+       This function does nothing when using <productname>NSS</productname> as
+       the <acronym>SSL</acronym> library.
+      </para>
      </listitem>
     </varlistentry>
 
@@ -7977,6 +7993,11 @@ void PQinitSSL(int do_ssl);
        might be preferable for applications that need to work with older
        versions of <application>libpq</application>.
       </para>
+
+      <para>
+       This function does nothing when using <productname>NSS</productname> as
+       the <acronym>SSL</acronym> library.
+      </para>
      </listitem>
     </varlistentry>
    </variablelist>
diff --git a/doc/src/sgml/runtime.sgml b/doc/src/sgml/runtime.sgml
index 6cda39f3ab..7d6188a794 100644
--- a/doc/src/sgml/runtime.sgml
+++ b/doc/src/sgml/runtime.sgml
@@ -2120,15 +2120,21 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
 
   <indexterm zone="ssl-tcp">
    <primary>SSL</primary>
+   <secondary>TLS</secondary>
   </indexterm>
 
   <para>
    <productname>PostgreSQL</productname> has native support for using
    <acronym>SSL</acronym> connections to encrypt client/server communications
    for increased security. This requires that
-   <productname>OpenSSL</productname> is installed on both client and
+   a supported TLS library is installed on both client and
    server systems and that support in <productname>PostgreSQL</productname> is
    enabled at build time (see <xref linkend="installation"/>).
+   Supported libraries are <productname>OpenSSL</productname> and
+   <productname>NSS</productname>. The terms <acronym>SSL</acronym> and
+   <acronym>TLS</acronym> are often used interchangeably to mean a secure
+   connection using a <acronym>TLS</acronym> protocol, even though
+   <acronym>SSL</acronym> protocols are no longer supported.
   </para>
 
   <sect2 id="ssl-setup">
@@ -2148,8 +2154,13 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
   </para>
 
   <para>
-   To start in <acronym>SSL</acronym> mode, files containing the server certificate
-   and private key must exist.  By default, these files are expected to be
+   To start in <acronym>SSL</acronym> mode, a server certificate
+   and private key must exist. The below sections on the different libraries
+   will discuss how to configure these.
+  </para>
+   
+  <para>
+   By default, these files are expected to be
    named <filename>server.crt</filename> and <filename>server.key</filename>, respectively, in
    the server's data directory, but other names and locations can be specified
    using the configuration parameters <xref linkend="guc-ssl-cert-file"/>
@@ -2239,6 +2250,18 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
   </note>
   </sect2>
 
+  <sect2 id="ssl-nss-config">
+   <title>NSS Configuration</title>
+
+  <para>
+   <productname>PostgreSQL</productname> will look for certificates and keys
+   in the <productname>NSS</productname> database specified by the parameter
+   <xref linkend="guc-ssl-database"/> in <filename>postgresql.conf</filename>.
+   The paramaters for certificate and key filenames are used to identify the
+   nicknames in the database.
+  </para>
+  </sect2>
+
   <sect2 id="ssl-client-certificates">
    <title>Using Client Certificates</title>
 
@@ -2314,7 +2337,7 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
   </sect2>
 
   <sect2 id="ssl-server-files">
-   <title>SSL Server File Usage</title>
+   <title>SSL Server File Parameter Usage</title>
 
    <para>
     <xref linkend="ssl-file-usage"/> summarizes the files that are
@@ -2361,6 +2384,14 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
       <entry>client certificate must not be on this list</entry>
      </row>
 
+     <row>
+      <entry><xref linkend="guc-ssl-database"/></entry>
+      <entry>certificate database</entry>
+      <entry>contains server certificates, keys and revocation lists; only
+      used when <productname>PostgreSQL</productname> is built with support
+      for <productname>NSS</productname>.</entry>
+     </row>
+
     </tbody>
    </tgroup>
   </table>
@@ -2488,6 +2519,45 @@ openssl x509 -req -in server.csr -text -days 365 \
    </para>
   </sect2>
 
+  <sect2 id="nss-certificate-database">
+   <title>NSS Certificate Databases</title>
+
+   <para>
+    When using <productname>NSS</productname>, all certificates and keys must
+    be loaded into an <productname>NSS</productname> certificate database.
+   </para>
+
+   <para>
+    To create a new <productname>NSS</productname> certificate database and
+    load the certificates created in <xref linkend="ssl-certificate-creation" />,
+    use the following <productname>NSS</productname> commands:
+<programlisting>
+certutil -d "sql:server.db" -N --empty-password
+certutil -d "sql:server.db" -A -n server.crt -i server.crt -t "CT,C,C"
+certutil -d "sql:server.db" -A -n root.crt -i root.crt -t "CT,C,C"
+</programlisting>
+    This will give the certificate the filename as the nickname identifier in
+    the database which is created as <filename>server.db</filename>.
+   </para>
+   <para>
+    Then load the server key, which require converting it to
+    <acronym>PKCS#12</acronym> format using the
+    <productname>OpenSSL</productname> tools:
+<programlisting>
+openssl pkcs12 -export -out server.pfx -inkey server.key -in server.crt \
+  -certfile root.crt -passout pass:
+pk12util -i server.pfx -d server.db -W ''
+</programlisting>
+   </para>
+   <para>
+    Finally a certificate revocation list can be loaded with the following
+    commands:
+<programlisting>
+crlutil -I -i server.crl -d server.db -B
+</programlisting>
+   </para>
+  </sect2>
+
  </sect1>
 
  <sect1 id="gssapi-enc">
diff --git a/doc/src/sgml/sslinfo.sgml b/doc/src/sgml/sslinfo.sgml
index 195949f55a..2fe6c70238 100644
--- a/doc/src/sgml/sslinfo.sgml
+++ b/doc/src/sgml/sslinfo.sgml
@@ -22,7 +22,8 @@
 
  <para>
   This extension won't build at all unless the installation was
-  configured with <literal>--with-openssl</literal>.
+  configured with SSL support, such as <literal>--with-openssl</literal>
+  or <literal>--with-nss</literal>.
  </para>
 
  <sect2>
@@ -54,7 +55,7 @@
     <listitem>
     <para>
      Returns the name of the protocol used for the SSL connection (e.g., TLSv1.0
-     TLSv1.1, or TLSv1.2).
+     TLSv1.1, TLSv1.2 or TLSv1.3).
     </para>
     </listitem>
    </varlistentry>
@@ -208,6 +209,9 @@ emailAddress
      the X.500 and X.509 standards, so you cannot just assign arbitrary
      meaning to them.
     </para>
+    <para>
+     This function is only available when using <productname>OpenSSL</productname>.
+    </para>
     </listitem>
    </varlistentry>
 
@@ -223,6 +227,9 @@ emailAddress
      Same as <function>ssl_client_dn_field</function>, but for the certificate issuer
      rather than the certificate subject.
     </para>
+    <para>
+     This function is only available when using <productname>OpenSSL</productname>.
+    </para>
     </listitem>
    </varlistentry>
 
@@ -238,6 +245,9 @@ emailAddress
      Provide information about extensions of client certificate: extension name,
      extension value, and if it is a critical extension.
     </para>
+    <para>
+     This function is only available when using <productname>OpenSSL</productname>.
+    </para>
     </listitem>
    </varlistentry>
   </variablelist>
diff --git a/src/Makefile.global.in b/src/Makefile.global.in
index 9a6265b3a0..2f25c51c6c 100644
--- a/src/Makefile.global.in
+++ b/src/Makefile.global.in
@@ -184,6 +184,7 @@ with_perl	= @with_perl@
 with_python	= @with_python@
 with_tcl	= @with_tcl@
 with_openssl	= @with_openssl@
+with_nss        = @with_nss@
 with_readline	= @with_readline@
 with_selinux	= @with_selinux@
 with_systemd	= @with_systemd@
@@ -232,6 +233,15 @@ CLANG = @CLANG@
 BITCODE_CFLAGS = @BITCODE_CFLAGS@
 BITCODE_CXXFLAGS = @BITCODE_CXXFLAGS@
 
+ifeq ($(with_openssl),yes)
+with_ssl = yes
+else ifeq ($(with_nss),yes)
+with_ssl = yes
+else
+with_ssl = no
+endif
+
+
 ##########################################################################
 #
 # Programs and flags
diff --git a/src/backend/libpq/Makefile b/src/backend/libpq/Makefile
index efc5ef760a..191266a426 100644
--- a/src/backend/libpq/Makefile
+++ b/src/backend/libpq/Makefile
@@ -30,6 +30,10 @@ OBJS = \
 
 ifeq ($(with_openssl),yes)
 OBJS += be-secure-openssl.o
+else
+ifeq ($(with_nss),yes)
+OBJS += be-secure-nss.o
+endif
 endif
 
 ifeq ($(with_gssapi),yes)
diff --git a/src/backend/libpq/auth.c b/src/backend/libpq/auth.c
index 02b6c3f127..8f4197d002 100644
--- a/src/backend/libpq/auth.c
+++ b/src/backend/libpq/auth.c
@@ -2870,7 +2870,14 @@ CheckCertAuth(Port *port)
 {
 	int			status_check_usermap = STATUS_ERROR;
 
+#if defined(USE_OPENSSL)
 	Assert(port->ssl);
+#elif defined(USE_NSS)
+	/* TODO: should we rename pr_fd to ssl, to keep consistency? */
+	Assert(port->pr_fd);
+#else
+	Assert(false);
+#endif
 
 	/* Make sure we have received a username in the certificate */
 	if (port->peer_cn == NULL ||
diff --git a/src/backend/libpq/be-secure-nss.c b/src/backend/libpq/be-secure-nss.c
new file mode 100644
index 0000000000..fe6540852b
--- /dev/null
+++ b/src/backend/libpq/be-secure-nss.c
@@ -0,0 +1,1038 @@
+/*-------------------------------------------------------------------------
+ *
+ * be-secure-nss.c
+ *	  functions for supporting NSS as a TLS backend
+ *
+ *
+ * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ *	  src/backend/libpq/be-secure-nss.c
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#include "postgres.h"
+
+#include <sys/stat.h>
+
+/*
+ * BITS_PER_BYTE is also defined in the NSPR header fils, so we need to undef
+ * our version to avoid compiler warnings on redefinition.
+ */
+#define pg_BITS_PER_BYTE BITS_PER_BYTE
+#undef BITS_PER_BYTE
+
+/*
+ * The nspr/obsolete/protypes.h NSPR header typedefs uint64 and int64 with
+ * colliding definitions from ours, causing a much expected compiler error.
+ * The definitions are however not actually used in NSPR at all, and are only
+ * intended for what seems to be backwards compatibility for apps written
+ * against old versions of NSPR.  The following comment is in the referenced
+ * file, and was added in 1998:
+ *
+ *		This section typedefs the old 'native' types to the new PR<type>s.
+ *		These definitions are scheduled to be eliminated at the earliest
+ *		possible time. The NSPR API is implemented and documented using
+ *		the new definitions.
+ *
+ * As there is no opt-out from pulling in these typedefs, we define the guard
+ * for the file to exclude it. This is incredibly ugly, but seems to be about
+ * the only way around it.
+ */
+#define PROTYPES_H
+#include <nspr.h>
+#undef PROTYPES_H
+#include <nss.h>
+#include <prio.h>
+#include <ssl.h>
+#include <sslerr.h>
+#include <secerr.h>
+#include <sslproto.h>
+#include <prtypes.h>
+#include <pk11pub.h>
+#include <secitem.h>
+#include <secport.h>
+#include <secder.h>
+#include <certdb.h>
+#include <base64.h>
+#include <cert.h>
+#include <prerror.h>
+#include <keyhi.h>
+
+typedef struct
+{
+	enum
+	{
+		PW_NONE = 0,
+		PW_FROMFILE = 1,
+		PW_PLAINTEXT = 2,
+		PW_EXTERNAL = 3
+	} source;
+	char	   *data;
+}			secuPWData;
+
+/*
+ * Ensure that the colliding definitions match, else throw an error. In case
+ * NSPR has removed the definition for some reasone, make sure to put ours
+ * back again.
+ */
+#if defined(BITS_PER_BYTE)
+#if BITS_PER_BYTE != pg_BITS_PER_BYTE
+#error "incompatible byte widths between NSPR and postgres"
+#endif
+#else
+#define BITS_PER_BYTE pg_BITS_PER_BYTE
+#endif
+#undef pg_BITS_PER_BYTE
+
+#include "common/pg_nss.h"
+#include "lib/stringinfo.h"
+#include "libpq/libpq.h"
+#include "nodes/pg_list.h"
+#include "miscadmin.h"
+#include "storage/fd.h"
+#include "utils/guc.h"
+#include "utils/memutils.h"
+
+static PRDescIdentity pr_id;
+
+static PRIOMethods pr_iomethods;
+static NSSInitContext * nss_context = NULL;
+static SSLVersionRange desired_sslver;
+
+/*
+ * PR_ImportTCPSocket() is a private API, but very widely used, as it's the
+ * only way to make NSS use an already set up POSIX file descriptor rather
+ * than opening one itself. To quote the NSS documentation:
+ *
+ *		"In theory, code that uses PR_ImportTCPSocket may break when NSPR's
+ *		implementation changes. In practice, this is unlikely to happen because
+ *		NSPR's implementation has been stable for years and because of NSPR's
+ *		strong commitment to backward compatibility."
+ *
+ * https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSPR/Reference/PR_ImportTCPSocket
+ *
+ * The function is declared in <private/pprio.h>, but as it is a header marked
+ * private we declare it here rather than including it.
+ */
+NSPR_API(PRFileDesc *) PR_ImportTCPSocket(int);
+
+/* NSS IO layer callback overrides */
+static PRInt32 pg_ssl_read(PRFileDesc * fd, void *buf, PRInt32 amount,
+						   PRIntn flags, PRIntervalTime timeout);
+static PRInt32 pg_ssl_write(PRFileDesc * fd, const void *buf, PRInt32 amount,
+							PRIntn flags, PRIntervalTime timeout);
+/* Utility functions */
+static PRFileDesc * init_iolayer(Port *port, int loglevel);
+static uint16 ssl_protocol_version_to_nss(int v, const char *guc_name);
+
+static char *pg_SSLerrmessage(PRErrorCode errcode);
+static char *ssl_protocol_version_to_string(int v);
+static SECStatus pg_cert_auth_handler(void *arg, PRFileDesc * fd,
+									  PRBool checksig, PRBool isServer);
+static SECStatus pg_bad_cert_handler(void *arg, PRFileDesc * fd);
+
+/* ------------------------------------------------------------ */
+/*						 Public interface						*/
+/* ------------------------------------------------------------ */
+
+static char *
+ssl_passphrase_callback(PK11SlotInfo * slot, PRBool retry, void *arg)
+{
+	return pstrdup("");
+}
+
+/*
+ * be_tls_init
+ *			Initialize the nss TLS library in the postmaster
+ *
+ * The majority of the setup needs to happen in be_tls_open_server since the
+ * NSPR initialization must happen after the forking of the backend. We could
+ * potentially move some parts in under !isServerStart, but so far this is the
+ * separation chosen.
+ */
+int
+be_tls_init(bool isServerStart)
+{
+	SECStatus	status;
+	SSLVersionRange supported_sslver;
+
+	/*
+	 * Set up the connection cache for multi-processing application behavior.
+	 * If we are in ServerStart then we initialize the cache. If the server is
+	 * already started, we inherit the cache such that it can be used for
+	 * connections. Calling SSL_ConfigMPServerSIDCache sets an environment
+	 * variable which contains enough information for the forked child to know
+	 * how to access it.  Passing NULL to SSL_InheritMPServerSIDCache will
+	 * make the forked child look it up by the default name SSL_INHERITANCE,
+	 * if env vars aren't inherited then the contents of the variable can be
+	 * passed instead.
+	 */
+	if (isServerStart)
+	{
+		/*
+		 * SSLv2 and SSLv3 are disabled in this TLS backend, but when setting
+		 * up the required session cache for NSS we still must supply timeout
+		 * values for v2 and The minimum allowed value for both is 5 seconds,
+		 * so opt for that in both cases (the defaults being 100 seconds and
+		 * 24 hours).
+		 *
+		 * Passing NULL as the directory for the session cache will default to
+		 * using /tmp on UNIX and \\temp on Windows.  Deciding if we want to
+		 * keep closer control on this directory is left as a TODO.
+		 */
+		status = SSL_ConfigMPServerSIDCache(MaxConnections, 5, 5, NULL);
+		if (status != SECSuccess)
+			ereport(FATAL,
+					(errmsg("unable to set up TLS connection cache: %s",
+							pg_SSLerrmessage(PR_GetError()))));
+
+	}
+	else
+	{
+		status = SSL_InheritMPServerSIDCache(NULL);
+		if (status != SECSuccess)
+		{
+			ereport(LOG,
+					(errmsg("unable to connect to TLS connection cache: %s",
+							pg_SSLerrmessage(PR_GetError()))));
+			return -1;
+		}
+	}
+
+	if (!ssl_database || strlen(ssl_database) == 0)
+	{
+		ereport(isServerStart ? FATAL : LOG,
+				(errmsg("no certificate database specified")));
+		goto error;
+	}
+
+	/*
+	 * We check for the desired TLS version range here, even though we cannot
+	 * set it until be_open_server such that we can be compatible with how the
+	 * OpenSSL backend reports errors for incompatible range configurations.
+	 * Set either the default supported TLS version range, or the configured
+	 * range from ssl_min_protocol_version and ssl_max_protocol version. In
+	 * case the user hasn't defined the maximum allowed version we fall back
+	 * to the highest version TLS that the library supports.
+	 */
+	if (SSL_VersionRangeGetSupported(ssl_variant_stream, &supported_sslver) != SECSuccess)
+	{
+		ereport(isServerStart ? FATAL : LOG,
+				(errmsg("unable to get default protocol support from NSS")));
+		goto error;
+	}
+
+	/*
+	 * Set the fallback versions for the TLS protocol version range to a
+	 * combination of our minimal requirement and the library maximum.
+	 */
+	desired_sslver.min = SSL_LIBRARY_VERSION_TLS_1_0;
+	desired_sslver.max = supported_sslver.max;
+
+	if (ssl_min_protocol_version)
+	{
+		int			ver = ssl_protocol_version_to_nss(ssl_min_protocol_version,
+													  "ssl_min_protocol_version");
+
+		if (ver == -1)
+		{
+			ereport(isServerStart ? FATAL : LOG,
+					(errmsg("\"%s\" setting \"%s\" not supported by this build",
+							"ssl_min_protocol_version",
+							GetConfigOption("ssl_min_protocol_version",
+											false, false))));
+			goto error;
+		}
+
+		if (ver > 0)
+			desired_sslver.min = ver;
+	}
+
+	if (ssl_max_protocol_version)
+	{
+		int			ver = ssl_protocol_version_to_nss(ssl_max_protocol_version,
+													  "ssl_max_protocol_version");
+
+		if (ver == -1)
+		{
+			ereport(isServerStart ? FATAL : LOG,
+					(errmsg("\"%s\" setting \"%s\" not supported by this build",
+							"ssl_max_protocol_version",
+							GetConfigOption("ssl_max_protocol_version",
+											false, false))));
+			goto error;
+		}
+		if (ver > 0)
+			desired_sslver.max = ver;
+
+		if (ver < desired_sslver.min)
+		{
+			ereport(isServerStart ? FATAL : LOG,
+					(errmsg("could not set SSL protocol version range"),
+					 errdetail("\"%s\" cannot be higher than \"%s\"",
+							   "ssl_min_protocol_version",
+							   "ssl_max_protocol_version")));
+			goto error;
+		}
+	}
+
+	return 0;
+error:
+	return -1;
+}
+
+int
+be_tls_open_server(Port *port)
+{
+	SECStatus	status;
+	PRFileDesc *model;
+	PRFileDesc *pr_fd;
+	PRFileDesc *layer;
+	CERTCertificate *server_cert;
+	SECKEYPrivateKey *private_key;
+	CERTSignedCrl *crl;
+	SECItem		crlname;
+	secuPWData	pwdata = {PW_NONE, 0};	/* TODO: This is a bogus callback */
+	char	   *cert_database;
+	NSSInitParameters params;
+
+	/*
+	 * The NSPR documentation states that runtime initialization via PR_Init
+	 * is no longer required, as the first caller into NSPR will perform the
+	 * initialization implicitly. The documentation doesn't however clarify
+	 * from which version this is holds true, so let's perform the potentially
+	 * superfluous initialization anyways to avoid crashing on older versions
+	 * of NSPR, as there is no difference in overhead.  The NSS documentation
+	 * still states that PR_Init must be called in some way (implicitly or
+	 * explicitly).
+	 *
+	 * The below parameters are what the implicit initialization would've done
+	 * for us, and should work even for older versions where it might not be
+	 * done automatically. The last parameter, maxPTDs, is set to various
+	 * values in other codebases, but has been unused since NSPR 2.1 which was
+	 * released sometime in 1998.
+	 */
+	PR_Init(PR_USER_THREAD, PR_PRIORITY_NORMAL, 0 /* maxPTDs */ );
+
+	/*
+	 * The certificate path (configdir) must contain a valid NSS database. If
+	 * the certificate path isn't a valid directory, NSS will fall back on the
+	 * system certificate database. If the certificate path is a directory but
+	 * is empty then the initialization will fail. On the client side this can
+	 * be allowed for any sslmode but the verify-xxx ones.
+	 * https://bugzilla.redhat.com/show_bug.cgi?id=728562 For the server side
+	 * we wont allow this to fail however, as we require the certificate and
+	 * key to exist.
+	 *
+	 * The original design of NSS was for a single application to use a single
+	 * copy of it, initialized with NSS_Initialize() which isn't returning any
+	 * handle with which to refer to NSS. NSS initialization and shutdown are
+	 * global for the application, so a shutdown in another NSS enabled
+	 * library would cause NSS to be stopped for libpq as well.  The fix has
+	 * been to introduce NSS_InitContext which returns a context handle to
+	 * pass to NSS_ShutdownContext.  NSS_InitContext was introduced in NSS
+	 * 3.12, but the use of it is not very well documented.
+	 * https://bugzilla.redhat.com/show_bug.cgi?id=738456
+	 *
+	 * The InitParameters struct passed can be used to override internal
+	 * values in NSS, but the usage is not documented at all. When using
+	 * NSS_Init initializations, the values are instead set via PK11_Configure
+	 * calls so the PK11_Configure documentation can be used to glean some
+	 * details on these.
+	 *
+	 * https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS/PKCS11/Module_Specs
+	 */
+	memset(&params, '\0', sizeof(params));
+	params.length = sizeof(params);
+
+	if (!ssl_database || strlen(ssl_database) == 0)
+		ereport(FATAL,
+				(errmsg("no certificate database specified")));
+
+	cert_database = psprintf("sql:%s", ssl_database);
+	nss_context = NSS_InitContext(cert_database, "", "", "",
+								  &params,
+								  NSS_INIT_READONLY | NSS_INIT_PK11RELOAD);
+	pfree(cert_database);
+
+	if (!nss_context)
+		ereport(FATAL,
+				(errmsg("unable to read certificate database \"%s\": %s",
+						ssl_database, pg_SSLerrmessage(PR_GetError()))));
+
+	/*
+	 * Set the passphrase callback which will be used both to obtain the
+	 * passphrase from the user, as well as by NSS to obtain the phrase
+	 * repeatedly.
+	 *
+	 * TODO: Figure this out - do note that we are setting another password
+	 * callback below for cert/key as well. Need to make sense of all these.
+	 */
+	PK11_SetPasswordFunc(ssl_passphrase_callback);
+
+	/*
+	 * Import the already opened socket as we don't want to use NSPR functions
+	 * for opening the network socket due to how the PostgreSQL protocol works
+	 * with TLS connections. This function is not part of the NSPR public API,
+	 * see the comment at the top of the file for the rationale of still using
+	 * it.
+	 */
+	pr_fd = PR_ImportTCPSocket(port->sock);
+	if (!pr_fd)
+		ereport(ERROR,
+				(errmsg("unable to connect to socket")));
+
+	/*
+	 * Most of the documentation available, and implementations of, NSS/NSPR
+	 * use the PR_NewTCPSocket() function here, which has the drawback that it
+	 * can only create IPv4 sockets. Instead use PR_OpenTCPSocket() which
+	 * copes with IPv6 as well.
+	 */
+	model = PR_OpenTCPSocket(port->laddr.addr.ss_family);
+	if (!model)
+		ereport(ERROR,
+				(errmsg("unable to open socket")));
+
+	/*
+	 * Convert the NSPR socket to an SSL socket. Ensuring the success of this
+	 * operation is critical as NSS SSL_* functions may return SECSuccess on
+	 * the socket even though SSL hasn't been enabled, which introduce a risk
+	 * of silent downgrades.
+	 */
+	model = SSL_ImportFD(NULL, model);
+	if (!model)
+		ereport(ERROR,
+				(errmsg("unable to enable TLS on socket")));
+
+	/*
+	 * Configure basic settings for the connection over the SSL socket in
+	 * order to set it up as a server.
+	 */
+	if (SSL_OptionSet(model, SSL_SECURITY, PR_TRUE) != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to configure TLS connection")));
+
+	if (SSL_OptionSet(model, SSL_HANDSHAKE_AS_SERVER, PR_TRUE) != SECSuccess ||
+		SSL_OptionSet(model, SSL_HANDSHAKE_AS_CLIENT, PR_FALSE) != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to configure TLS connection as server")));
+
+	/*
+	 * SSLv2 is disabled by default, and SSLv3 will be excluded from the range
+	 * of allowed protocols further down. Since we really don't want these to
+	 * ever be enabled, let's use belts and suspenders and explicitly turn
+	 * them off as well.
+	 */
+	SSL_OptionSet(model, SSL_ENABLE_SSL2, PR_FALSE);
+	SSL_OptionSet(model, SSL_ENABLE_SSL3, PR_FALSE);
+
+#ifdef SSL_CBC_RANDOM_IV
+
+	/*
+	 * Enable protection against the BEAST attack in case the NSS server has
+	 * support for that. While SSLv3 is disabled, we may still allow TLSv1
+	 * which is affected. The option isn't documented as an SSL option, but as
+	 * an NSS environment variable.
+	 */
+	SSL_OptionSet(model, SSL_CBC_RANDOM_IV, PR_TRUE);
+#endif
+
+	/*
+	 * Configure the allowed cipher. If there are no user preferred suites,
+	 * set the domestic policy. TODO: while this code works, the set of
+	 * ciphers which can be set and still end up with a working socket is
+	 * woefully underdocumented for anything more recent than SSLv3 (the code
+	 * for TLS actually calls ssl3 functions under the hood for
+	 * SSL_CipherPrefSet), so it's unclear if this is helpful or not. Using
+	 * the policies works, but may be too coarsely grained.
+	 *
+	 * Another TODO: The SSL_ImplementedCiphers table returned with calling
+	 * SSL_GetImplementedCiphers is sorted in server preference order. Sorting
+	 * SSLCipherSuites according to the order of the ciphers therein could be
+	 * a way to implement ssl_prefer_server_ciphers - if we at all want to use
+	 * cipher selection for NSS like how we do it for OpenSSL that is.
+	 */
+
+	/*
+	 * If no ciphers are specified, we use the domestic policy
+	 */
+	if (!SSLCipherSuites || strlen(SSLCipherSuites) == 0)
+	{
+		status = NSS_SetDomesticPolicy();
+		if (status != SECSuccess)
+			ereport(ERROR,
+					(errmsg("unable to set cipher policy: %s",
+							pg_SSLerrmessage(PR_GetError()))));
+	}
+	else
+	{
+		char	   *ciphers,
+				   *c;
+
+		char	   *sep = ":;, ";
+		PRUint16	ciphercode;
+		const		PRUint16 *nss_ciphers;
+
+		/*
+		 * If the user has specified a set of preferred cipher suites we start
+		 * by turning off all the existing suites to avoid the risk of down-
+		 * grades to a weaker cipher than expected.
+		 */
+		nss_ciphers = SSL_GetImplementedCiphers();
+		for (int i = 0; i < SSL_GetNumImplementedCiphers(); i++)
+			SSL_CipherPrefSet(model, nss_ciphers[i], PR_FALSE);
+
+		ciphers = pstrdup(SSLCipherSuites);
+
+		for (c = strtok(ciphers, sep); c; c = strtok(NULL, sep))
+		{
+			ciphercode = pg_find_cipher(c);
+			if (ciphercode != INVALID_CIPHER)
+			{
+				status = SSL_CipherPrefSet(model, ciphercode, PR_TRUE);
+				if (status != SECSuccess)
+					ereport(ERROR,
+							(errmsg("invalid cipher-suite specified: %s", c)));
+			}
+		}
+
+		pfree(ciphers);
+	}
+
+	if (SSL_VersionRangeSet(model, &desired_sslver) != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to set requested SSL protocol version range")));
+
+	/*
+	 * Set up the custom IO layer.
+	 */
+	layer = init_iolayer(port, ERROR);
+	if (!layer)
+		goto error;
+
+	/* Store the Port as private data available in callbacks */
+	layer->secret = (void *) port;
+
+	if (PR_PushIOLayer(pr_fd, PR_TOP_IO_LAYER, layer) != PR_SUCCESS)
+	{
+		PR_Close(layer);
+		ereport(ERROR,
+				(errmsg("unable to push IO layer")));
+	}
+
+	/* TODO: set the postgres password callback param as callback function */
+	server_cert = PK11_FindCertFromNickname(ssl_cert_file, &pwdata /* password callback */ );
+	if (!server_cert)
+		ereport(ERROR,
+				(errmsg("unable to find certificate for \"%s\": %s",
+						ssl_cert_file, pg_SSLerrmessage(PR_GetError()))));
+
+	/* TODO: set the postgres password callback param as callback function */
+	private_key = PK11_FindKeyByAnyCert(server_cert, &pwdata /* password callback */ );
+	if (!private_key)
+		ereport(ERROR,
+				(errmsg("unable to find private key for \"%s\": %s",
+						ssl_cert_file, pg_SSLerrmessage(PR_GetError()))));
+
+	/*
+	 * NSS doesn't use CRL files on disk, so we use the ssl_crl_file guc to
+	 * contain the CRL nickname for the current server certificate in the NSS
+	 * certificate database. The main difference from the OpenSSL backend is
+	 * that NSS will use the CRL regardless, but being able to make sure the
+	 * CRL is loaded seems like a good feature.
+	 */
+	if (ssl_crl_file[0])
+	{
+		SECITEM_CopyItem(NULL, &crlname, &server_cert->derSubject);
+		crl = SEC_FindCrlByName(CERT_GetDefaultCertDB(), &crlname, SEC_CRL_TYPE);
+		if (!crl)
+			ereport(ERROR,
+					(errmsg("specified CRL not found in database")));
+		SEC_DestroyCrl(crl);
+	}
+
+	/*
+	 * Finally we must configure the socket for being a server by setting the
+	 * certificate and key.
+	 */
+	status = SSL_ConfigSecureServer(model, server_cert, private_key, kt_rsa);
+	if (status != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to configure secure server: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+	status = SSL_ConfigServerCert(model, server_cert, private_key, NULL, 0);
+	if (status != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to configure server for TLS server connections: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+
+	ssl_loaded_verify_locations = true;
+
+	/*
+	 * At this point, we no longer have use for the certificate and private
+	 * key as they have been copied into the context by NSS. Destroy our
+	 * copies explicitly to clean out the memory as best we can.
+	 */
+	CERT_DestroyCertificate(server_cert);
+	SECKEY_DestroyPrivateKey(private_key);
+
+	status = SSL_AuthCertificateHook(model, pg_cert_auth_handler, (void *) port);
+	if (status != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to install authcert hook: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+	SSL_BadCertHook(model, pg_bad_cert_handler, (void *) port);
+	SSL_OptionSet(model, SSL_REQUEST_CERTIFICATE, PR_TRUE);
+	SSL_OptionSet(model, SSL_REQUIRE_CERTIFICATE, PR_FALSE);
+
+	port->pr_fd = SSL_ImportFD(model, pr_fd);
+	if (!port->pr_fd)
+		ereport(ERROR,
+				(errmsg("unable to initialize")));
+
+	PR_Close(model);
+
+	/*
+	 * Force a handshake on the next I/O request, the second parameter means
+	 * that we are a server, PR_FALSE would indicate being a client. NSPR
+	 * requires us to call SSL_ResetHandshake since we imported an already
+	 * established socket.
+	 */
+	status = SSL_ResetHandshake(port->pr_fd, PR_TRUE);
+	if (status != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to initiate handshake: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+	status = SSL_ForceHandshake(port->pr_fd);
+	if (status != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to handshake: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+
+	port->ssl_in_use = true;
+	return 0;
+
+error:
+	return 1;
+}
+
+ssize_t
+be_tls_read(Port *port, void *ptr, size_t len, int *waitfor)
+{
+	ssize_t		n_read;
+	PRErrorCode err;
+
+	n_read = PR_Read(port->pr_fd, ptr, len);
+
+	if (n_read < 0)
+	{
+		err = PR_GetError();
+
+		/* XXX: This logic seems potentially bogus? */
+		if (err == PR_WOULD_BLOCK_ERROR)
+			*waitfor = WL_SOCKET_READABLE;
+		else
+			*waitfor = WL_SOCKET_WRITEABLE;
+	}
+
+	return n_read;
+}
+
+ssize_t
+be_tls_write(Port *port, void *ptr, size_t len, int *waitfor)
+{
+	ssize_t		n_write;
+	PRErrorCode err;
+
+	n_write = PR_Send(port->pr_fd, ptr, len, 0, PR_INTERVAL_NO_WAIT);
+
+	if (n_write < 0)
+	{
+		err = PR_GetError();
+
+		if (err == PR_WOULD_BLOCK_ERROR)
+			*waitfor = WL_SOCKET_WRITEABLE;
+		else
+			*waitfor = WL_SOCKET_READABLE;
+	}
+
+	return n_write;
+}
+
+void
+be_tls_close(Port *port)
+{
+	if (!port)
+		return;
+
+	if (port->peer_cn)
+	{
+		SSL_InvalidateSession(port->pr_fd);
+		pfree(port->peer_cn);
+		port->peer_cn = NULL;
+	}
+
+	PR_Close(port->pr_fd);
+	port->pr_fd = NULL;
+	port->ssl_in_use = false;
+
+	if (nss_context)
+	{
+		NSS_ShutdownContext(nss_context);
+		nss_context = NULL;
+	}
+}
+
+void
+be_tls_destroy(void)
+{
+	/*
+	 * It reads a bit odd to clear a session cache when we are destroying the
+	 * context altogether, but if the session cache isn't cleared before
+	 * shutting down the context it will fail with SEC_ERROR_BUSY.
+	 */
+	SSL_ClearSessionCache();
+}
+
+int
+be_tls_get_cipher_bits(Port *port)
+{
+	SECStatus	status;
+	SSLChannelInfo channel;
+	SSLCipherSuiteInfo suite;
+
+	status = SSL_GetChannelInfo(port->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+		goto error;
+
+	status = SSL_GetCipherSuiteInfo(channel.cipherSuite, &suite, sizeof(suite));
+	if (status != SECSuccess)
+		goto error;
+
+	return suite.effectiveKeyBits;
+
+error:
+	ereport(WARNING,
+			(errmsg("unable to extract TLS session information: %s",
+					pg_SSLerrmessage(PR_GetError()))));
+	return 0;
+}
+
+/*
+ * be_tls_get_compression
+ *
+ * NSS disabled support for TLS compression in version 3.33 and removed the
+ * code in a subsequent release. The API for retrieving information about
+ * compression as well as enabling it is kept for backwards compatibility, but
+ * we don't need to consult it since it was only available for SSLv3 which we
+ * don't support.
+ *
+ * https://bugzilla.mozilla.org/show_bug.cgi?id=1409587
+ */
+bool
+be_tls_get_compression(Port *port)
+{
+	return false;
+}
+
+/*
+ * be_tls_get_version
+ *
+ * Returns the protocol version used for the current connection, or NULL in
+ * case of errors.
+ */
+const char *
+be_tls_get_version(Port *port)
+{
+	SECStatus	status;
+	SSLChannelInfo channel;
+
+	status = SSL_GetChannelInfo(port->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+	{
+		ereport(WARNING,
+				(errmsg("unable to extract TLS session information: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+		return NULL;
+	}
+
+	return ssl_protocol_version_to_string(channel.protocolVersion);
+}
+
+const char *
+be_tls_get_cipher(Port *port)
+{
+	SECStatus	status;
+	SSLChannelInfo channel;
+	SSLCipherSuiteInfo suite;
+
+	status = SSL_GetChannelInfo(port->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+		goto error;
+
+	status = SSL_GetCipherSuiteInfo(channel.cipherSuite, &suite, sizeof(suite));
+	if (status != SECSuccess)
+		goto error;
+
+	return suite.cipherSuiteName;
+
+error:
+	ereport(WARNING,
+			(errmsg("unable to extract TLS session information: %s",
+					pg_SSLerrmessage(PR_GetError()))));
+	return NULL;
+}
+
+void
+be_tls_get_peer_subject_name(Port *port, char *ptr, size_t len)
+{
+	CERTCertificate *certificate;
+
+	certificate = SSL_PeerCertificate(port->pr_fd);
+	if (certificate)
+		strlcpy(ptr, CERT_NameToAscii(&certificate->subject), len);
+	else
+		ptr[0] = '\0';
+}
+
+void
+be_tls_get_peer_issuer_name(Port *port, char *ptr, size_t len)
+{
+	CERTCertificate *certificate;
+
+	certificate = SSL_PeerCertificate(port->pr_fd);
+	if (certificate)
+		strlcpy(ptr, CERT_NameToAscii(&certificate->issuer), len);
+	else
+		ptr[0] = '\0';
+}
+
+void
+be_tls_get_peer_serial(Port *port, char *ptr, size_t len)
+{
+	CERTCertificate *certificate;
+
+	certificate = SSL_PeerCertificate(port->pr_fd);
+	if (certificate)
+		snprintf(ptr, len, "%li", DER_GetInteger(&(certificate->serialNumber)));
+	else
+		ptr[0] = '\0';
+}
+
+static SECStatus
+pg_bad_cert_handler(void *arg, PRFileDesc * fd)
+{
+	Port	   *port = (Port *) arg;
+
+	port->peer_cert_valid = false;
+	return SECFailure;
+}
+
+static SECStatus
+pg_cert_auth_handler(void *arg, PRFileDesc * fd, PRBool checksig, PRBool isServer)
+{
+	SECStatus	status;
+	Port	   *port = (Port *) arg;
+	CERTCertificate *cert;
+	char	   *peer_cn;
+	int			len;
+
+	status = SSL_AuthCertificate(CERT_GetDefaultCertDB(), port->pr_fd, checksig, PR_TRUE);
+	if (status == SECSuccess)
+	{
+		cert = SSL_PeerCertificate(port->pr_fd);
+		len = strlen(cert->subjectName);
+		peer_cn = MemoryContextAllocZero(TopMemoryContext, len + 1);
+		if (strncmp(cert->subjectName, "CN=", 3) == 0)
+			strlcpy(peer_cn, cert->subjectName + strlen("CN="), len + 1);
+		else
+			strlcpy(peer_cn, cert->subjectName, len + 1);
+		CERT_DestroyCertificate(cert);
+
+		port->peer_cn = peer_cn;
+		port->peer_cert_valid = true;
+	}
+
+	return status;
+}
+
+/* ------------------------------------------------------------ */
+/*						Internal functions						*/
+/* ------------------------------------------------------------ */
+
+static PRInt32
+pg_ssl_read(PRFileDesc * fd, void *buf, PRInt32 amount, PRIntn flags,
+			PRIntervalTime timeout)
+{
+	PRRecvFN	read_fn;
+	PRInt32		n_read;
+
+	read_fn = fd->lower->methods->recv;
+	n_read = read_fn(fd->lower, buf, amount, flags, timeout);
+
+	return n_read;
+}
+
+static PRInt32
+pg_ssl_write(PRFileDesc * fd, const void *buf, PRInt32 amount, PRIntn flags,
+			 PRIntervalTime timeout)
+{
+	PRSendFN	send_fn;
+	PRInt32		n_write;
+
+	send_fn = fd->lower->methods->send;
+	n_write = send_fn(fd->lower, buf, amount, flags, timeout);
+
+	return n_write;
+}
+
+static PRFileDesc *
+init_iolayer(Port *port, int loglevel)
+{
+	const		PRIOMethods *default_methods;
+	PRFileDesc *layer;
+
+	/*
+	 * Start by initializing our layer with all the default methods so that we
+	 * can selectively override the ones we want while still ensuring that we
+	 * have a complete layer specification.
+	 */
+	default_methods = PR_GetDefaultIOMethods();
+	memcpy(&pr_iomethods, default_methods, sizeof(PRIOMethods));
+
+	pr_iomethods.recv = pg_ssl_read;
+	pr_iomethods.send = pg_ssl_write;
+
+	/*
+	 * Each IO layer must be identified by a unique name, where uniqueness is
+	 * per connection. Each connection in a postgres cluster can generate the
+	 * identity from the same string as they will create their IO layers on
+	 * different sockets. Only one layer per socket can have the same name.
+	 */
+	pr_id = PR_GetUniqueIdentity("PostgreSQL");
+	if (pr_id == PR_INVALID_IO_LAYER)
+	{
+		ereport(loglevel,
+				(errmsg("out of memory when setting up TLS connection")));
+		return NULL;
+	}
+
+	/*
+	 * Create the actual IO layer as a stub such that it can be pushed onto
+	 * the layer stack. The step via a stub is required as we define custom
+	 * callbacks.
+	 */
+	layer = PR_CreateIOLayerStub(pr_id, &pr_iomethods);
+	if (!layer)
+	{
+		ereport(loglevel,
+				(errmsg("unable to create NSS I/O layer")));
+		return NULL;
+	}
+
+	return layer;
+}
+
+static char *
+ssl_protocol_version_to_string(int v)
+{
+	switch (v)
+	{
+			/* SSL v2 and v3 are not supported */
+		case SSL_LIBRARY_VERSION_2:
+		case SSL_LIBRARY_VERSION_3_0:
+			Assert(false);
+			break;
+
+		case SSL_LIBRARY_VERSION_TLS_1_0:
+			return pstrdup("TLSv1.0");
+		case SSL_LIBRARY_VERSION_TLS_1_1:
+			return pstrdup("TLSv1.1");
+		case SSL_LIBRARY_VERSION_TLS_1_2:
+			return pstrdup("TLSv1.2");
+		case SSL_LIBRARY_VERSION_TLS_1_3:
+			return pstrdup("TLSv1.3");
+	}
+
+	return pstrdup("unknown");
+}
+
+
+/*
+ * ssl_protocol_version_to_nss
+ *			Translate PostgreSQL TLS version to NSS version
+ *
+ * Returns zero in case the requested TLS version is undefined (PG_ANY) and
+ * should be set by the caller, or -1 on failure.
+ */
+static uint16
+ssl_protocol_version_to_nss(int v, const char *guc_name)
+{
+	switch (v)
+	{
+			/*
+			 * There is no SSL_LIBRARY_ macro defined in NSS with the value
+			 * zero, so we use this to signal the caller that the highest
+			 * useful version should be set on the connection.
+			 */
+		case PG_TLS_ANY:
+			return 0;
+
+			/*
+			 * No guard is required here as there are no versions of NSS
+			 * without support for TLS1.
+			 */
+		case PG_TLS1_VERSION:
+			return SSL_LIBRARY_VERSION_TLS_1_0;
+		case PG_TLS1_1_VERSION:
+#ifdef SSL_LIBRARY_VERSION_TLS_1_1
+			return SSL_LIBRARY_VERSION_TLS_1_1;
+#else
+			break;
+#endif
+		case PG_TLS1_2_VERSION:
+#ifdef SSL_LIBRARY_VERSION_TLS_1_2
+			return SSL_LIBRARY_VERSION_TLS_1_2;
+#else
+			break;
+#endif
+		case PG_TLS1_3_VERSION:
+#ifdef SSL_LIBRARY_VERSION_TLS_1_3
+			return SSL_LIBRARY_VERSION_TLS_1_3;
+#else
+			break;
+#endif
+		default:
+			break;
+	}
+
+	return -1;
+}
+
+/*
+ * pg_SSLerrmessage
+ *		Create and return a human readable error message given
+ *		the specified error code
+ *
+ * PR_ErrorToName only converts the enum identifier of the error to string,
+ * but that can be quite useful for debugging (and in case PR_ErrorToString is
+ * unable to render a message then we at least have something).
+ */
+static char *
+pg_SSLerrmessage(PRErrorCode errcode)
+{
+	char		error[128];
+	int			ret;
+
+	/* TODO: this should perhaps use a StringInfo instead.. */
+	ret = pg_snprintf(error, sizeof(error), "%s (%s)",
+					  PR_ErrorToString(errcode, PR_LANGUAGE_I_DEFAULT),
+					  PR_ErrorToName(errcode));
+	if (ret)
+		return pstrdup(error);
+
+	return pstrdup(_("unknown TLS error"));
+}
diff --git a/src/backend/libpq/be-secure-openssl.c b/src/backend/libpq/be-secure-openssl.c
index 8b21ff4065..5962cffc0c 100644
--- a/src/backend/libpq/be-secure-openssl.c
+++ b/src/backend/libpq/be-secure-openssl.c
@@ -1298,15 +1298,28 @@ X509_NAME_to_cstring(X509_NAME *name)
 	char	   *dp;
 	char	   *result;
 
+	if (membuf == NULL)
+		ereport(ERROR,
+				(errcode(ERRCODE_OUT_OF_MEMORY),
+				 errmsg("failed to create BIO")));
+
 	(void) BIO_set_close(membuf, BIO_CLOSE);
 	for (i = 0; i < count; i++)
 	{
 		e = X509_NAME_get_entry(name, i);
 		nid = OBJ_obj2nid(X509_NAME_ENTRY_get_object(e));
+		if (nid == NID_undef)
+			ereport(ERROR,
+					(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
+					 errmsg("could not get NID for ASN1_OBJECT object")));
 		v = X509_NAME_ENTRY_get_data(e);
 		field_name = OBJ_nid2sn(nid);
 		if (!field_name)
 			field_name = OBJ_nid2ln(nid);
+		if (field_name == NULL)
+			ereport(ERROR,
+					(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
+					 errmsg("could not convert NID %d to an ASN1_OBJECT structure", nid)));
 		BIO_printf(membuf, "/%s=", field_name);
 		ASN1_STRING_print_ex(membuf, v,
 							 ((ASN1_STRFLGS_RFC2253 & ~ASN1_STRFLGS_ESC_MSB)
@@ -1322,7 +1335,8 @@ X509_NAME_to_cstring(X509_NAME *name)
 	result = pstrdup(dp);
 	if (dp != sp)
 		pfree(dp);
-	BIO_free(membuf);
+	if (BIO_free(membuf) != 1)
+		elog(ERROR, "could not free OpenSSL BIO structure");
 
 	return result;
 }
diff --git a/src/backend/libpq/be-secure.c b/src/backend/libpq/be-secure.c
index 2ae507a902..f39977b80c 100644
--- a/src/backend/libpq/be-secure.c
+++ b/src/backend/libpq/be-secure.c
@@ -49,6 +49,9 @@ bool		ssl_passphrase_command_supports_reload;
 #ifdef USE_SSL
 bool		ssl_loaded_verify_locations = false;
 #endif
+#ifdef USE_NSS
+char	   *ssl_database;
+#endif
 
 /* GUC variable controlling SSL cipher list */
 char	   *SSLCipherSuites = NULL;
diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c
index de87ad6ef7..33c3eebf48 100644
--- a/src/backend/utils/misc/guc.c
+++ b/src/backend/utils/misc/guc.c
@@ -4262,7 +4262,11 @@ static struct config_string ConfigureNamesString[] =
 		},
 		&ssl_library,
 #ifdef USE_SSL
+#if defined(USE_OPENSSL)
 		"OpenSSL",
+#elif defined(USE_NSS)
+		"NSS",
+#endif
 #else
 		"",
 #endif
@@ -4320,6 +4324,18 @@ static struct config_string ConfigureNamesString[] =
 		check_canonical_path, assign_pgstat_temp_directory, NULL
 	},
 
+#ifdef USE_NSS
+	{
+		{"ssl_database", PGC_SIGHUP, CONN_AUTH_SSL,
+			gettext_noop("Location of the NSS certificate database."),
+			NULL
+		},
+		&ssl_database,
+		"",
+		NULL, NULL, NULL
+	},
+#endif
+
 	{
 		{"synchronous_standby_names", PGC_SIGHUP, REPLICATION_PRIMARY,
 			gettext_noop("Number of synchronous standbys and list of names of potential synchronous ones."),
@@ -4348,8 +4364,10 @@ static struct config_string ConfigureNamesString[] =
 			GUC_SUPERUSER_ONLY
 		},
 		&SSLCipherSuites,
-#ifdef USE_OPENSSL
+#if defined(USE_OPENSSL)
 		"HIGH:MEDIUM:+3DES:!aNULL",
+#elif defined (USE_NSS)
+		"",
 #else
 		"none",
 #endif
diff --git a/src/include/common/pg_nss.h b/src/include/common/pg_nss.h
new file mode 100644
index 0000000000..74298c8bb1
--- /dev/null
+++ b/src/include/common/pg_nss.h
@@ -0,0 +1,141 @@
+/*-------------------------------------------------------------------------
+ *
+ * pg_nss.h
+ *	  Support for NSS as a TLS backend
+ *
+ * These definitions are used by both frontend and backend code.
+ *
+ * Copyright (c) 2020, PostgreSQL Global Development Group
+ *
+ * IDENTIFICATION
+ *        src/include/common/pg_nss.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef PG_NSS_H
+#define PG_NSS_H
+
+#ifdef USE_NSS
+
+#include <sslproto.h>
+
+PRUint16	pg_find_cipher(char *name);
+
+typedef struct
+{
+	const char *name;
+	PRUint16	number;
+}			NSSCiphers;
+
+#define INVALID_CIPHER	0xFFFF
+
+/*
+ * This list is a partial copy of the ciphers in NSS files lib/ssl/sslproto.h
+ * in order to provide a human readable version of the ciphers. It would be
+ * nice to not have to have this, but NSS doesn't provide any API addressing
+ * the ciphers by name. TODO: do we want more of the ciphers, or perhaps less?
+ */
+static const NSSCiphers NSS_CipherList[] = {
+
+	{"TLS_NULL_WITH_NULL_NULL", TLS_NULL_WITH_NULL_NULL},
+
+	{"TLS_RSA_WITH_NULL_MD5", TLS_RSA_WITH_NULL_MD5},
+	{"TLS_RSA_WITH_NULL_SHA", TLS_RSA_WITH_NULL_SHA},
+	{"TLS_RSA_WITH_RC4_128_MD5", TLS_RSA_WITH_RC4_128_MD5},
+	{"TLS_RSA_WITH_RC4_128_SHA", TLS_RSA_WITH_RC4_128_SHA},
+	{"TLS_RSA_WITH_IDEA_CBC_SHA", TLS_RSA_WITH_IDEA_CBC_SHA},
+	{"TLS_RSA_WITH_DES_CBC_SHA", TLS_RSA_WITH_DES_CBC_SHA},
+	{"TLS_RSA_WITH_3DES_EDE_CBC_SHA", TLS_RSA_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_DH_DSS_WITH_DES_CBC_SHA", TLS_DH_DSS_WITH_DES_CBC_SHA},
+	{"TLS_DH_DSS_WITH_3DES_EDE_CBC_SHA", TLS_DH_DSS_WITH_3DES_EDE_CBC_SHA},
+	{"TLS_DH_RSA_WITH_DES_CBC_SHA", TLS_DH_RSA_WITH_DES_CBC_SHA},
+	{"TLS_DH_RSA_WITH_3DES_EDE_CBC_SHA", TLS_DH_RSA_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_DHE_DSS_WITH_DES_CBC_SHA", TLS_DHE_DSS_WITH_DES_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_3DES_EDE_CBC_SHA", TLS_DHE_DSS_WITH_3DES_EDE_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_DES_CBC_SHA", TLS_DHE_RSA_WITH_DES_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA", TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_DH_anon_WITH_RC4_128_MD5", TLS_DH_anon_WITH_RC4_128_MD5},
+	{"TLS_DH_anon_WITH_DES_CBC_SHA", TLS_DH_anon_WITH_DES_CBC_SHA},
+	{"TLS_DH_anon_WITH_3DES_EDE_CBC_SHA", TLS_DH_anon_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_RSA_WITH_AES_128_CBC_SHA", TLS_RSA_WITH_AES_128_CBC_SHA},
+	{"TLS_DH_DSS_WITH_AES_128_CBC_SHA", TLS_DH_DSS_WITH_AES_128_CBC_SHA},
+	{"TLS_DH_RSA_WITH_AES_128_CBC_SHA", TLS_DH_RSA_WITH_AES_128_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_AES_128_CBC_SHA", TLS_DHE_DSS_WITH_AES_128_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_AES_128_CBC_SHA", TLS_DHE_RSA_WITH_AES_128_CBC_SHA},
+	{"TLS_DH_anon_WITH_AES_128_CBC_SHA", TLS_DH_anon_WITH_AES_128_CBC_SHA},
+
+	{"TLS_RSA_WITH_AES_256_CBC_SHA", TLS_RSA_WITH_AES_256_CBC_SHA},
+	{"TLS_DH_DSS_WITH_AES_256_CBC_SHA", TLS_DH_DSS_WITH_AES_256_CBC_SHA},
+	{"TLS_DH_RSA_WITH_AES_256_CBC_SHA", TLS_DH_RSA_WITH_AES_256_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_AES_256_CBC_SHA", TLS_DHE_DSS_WITH_AES_256_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_AES_256_CBC_SHA", TLS_DHE_RSA_WITH_AES_256_CBC_SHA},
+	{"TLS_DH_anon_WITH_AES_256_CBC_SHA", TLS_DH_anon_WITH_AES_256_CBC_SHA},
+	{"TLS_RSA_WITH_NULL_SHA256", TLS_RSA_WITH_NULL_SHA256},
+	{"TLS_RSA_WITH_AES_128_CBC_SHA256", TLS_RSA_WITH_AES_128_CBC_SHA256},
+	{"TLS_RSA_WITH_AES_256_CBC_SHA256", TLS_RSA_WITH_AES_256_CBC_SHA256},
+
+	{"TLS_DHE_DSS_WITH_AES_128_CBC_SHA256", TLS_DHE_DSS_WITH_AES_128_CBC_SHA256},
+	{"TLS_RSA_WITH_CAMELLIA_128_CBC_SHA", TLS_RSA_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DH_DSS_WITH_CAMELLIA_128_CBC_SHA", TLS_DH_DSS_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DH_RSA_WITH_CAMELLIA_128_CBC_SHA", TLS_DH_RSA_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_CAMELLIA_128_CBC_SHA", TLS_DHE_DSS_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA", TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DH_anon_WITH_CAMELLIA_128_CBC_SHA", TLS_DH_anon_WITH_CAMELLIA_128_CBC_SHA},
+
+	{"TLS_DHE_DSS_WITH_RC4_128_SHA", TLS_DHE_DSS_WITH_RC4_128_SHA},
+	{"TLS_DHE_RSA_WITH_AES_128_CBC_SHA256", TLS_DHE_RSA_WITH_AES_128_CBC_SHA256},
+	{"TLS_DHE_DSS_WITH_AES_256_CBC_SHA256", TLS_DHE_DSS_WITH_AES_256_CBC_SHA256},
+	{"TLS_DHE_RSA_WITH_AES_256_CBC_SHA256", TLS_DHE_RSA_WITH_AES_256_CBC_SHA256},
+
+	{"TLS_RSA_WITH_CAMELLIA_256_CBC_SHA", TLS_RSA_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DH_DSS_WITH_CAMELLIA_256_CBC_SHA", TLS_DH_DSS_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DH_RSA_WITH_CAMELLIA_256_CBC_SHA", TLS_DH_RSA_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_CAMELLIA_256_CBC_SHA", TLS_DHE_DSS_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA", TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DH_anon_WITH_CAMELLIA_256_CBC_SHA", TLS_DH_anon_WITH_CAMELLIA_256_CBC_SHA},
+
+	{"TLS_RSA_WITH_SEED_CBC_SHA", TLS_RSA_WITH_SEED_CBC_SHA},
+
+	{"TLS_RSA_WITH_AES_128_GCM_SHA256", TLS_RSA_WITH_AES_128_GCM_SHA256},
+	{"TLS_RSA_WITH_AES_256_GCM_SHA384", TLS_RSA_WITH_AES_256_GCM_SHA384},
+	{"TLS_DHE_RSA_WITH_AES_128_GCM_SHA256", TLS_DHE_RSA_WITH_AES_128_GCM_SHA256},
+	{"TLS_DHE_RSA_WITH_AES_256_GCM_SHA384", TLS_DHE_RSA_WITH_AES_256_GCM_SHA384},
+	{"TLS_DHE_DSS_WITH_AES_128_GCM_SHA256", TLS_DHE_DSS_WITH_AES_128_GCM_SHA256},
+	{"TLS_DHE_DSS_WITH_AES_256_GCM_SHA384", TLS_DHE_DSS_WITH_AES_256_GCM_SHA384},
+
+	{"TLS_AES_128_GCM_SHA256", TLS_AES_128_GCM_SHA256},
+	{"TLS_AES_256_GCM_SHA384", TLS_AES_256_GCM_SHA384},
+	{"TLS_CHACHA20_POLY1305_SHA256", TLS_CHACHA20_POLY1305_SHA256},
+	{NULL, 0}
+};
+
+/*
+ * pg_find_cipher
+ *			Translate an NSS ciphername to the cipher code
+ *
+ * Searches the configured ciphers for the corresponding cipher code to the
+ * name. Search is performed case insensitive.
+ */
+PRUint16
+pg_find_cipher(char *name)
+{
+	const		NSSCiphers *cipher_list = NSS_CipherList;
+
+	while (cipher_list->name)
+	{
+		if (pg_strcasecmp(cipher_list->name, name) == 0)
+			return cipher_list->number;
+
+		cipher_list++;
+	}
+
+	return 0xFFFF;
+}
+
+#endif							/* USE_NSS */
+
+#endif							/* PG_NSS_H */
diff --git a/src/include/libpq/libpq-be.h b/src/include/libpq/libpq-be.h
index 0a23281ad5..f11ddd6b2e 100644
--- a/src/include/libpq/libpq-be.h
+++ b/src/include/libpq/libpq-be.h
@@ -192,13 +192,18 @@ typedef struct Port
 	bool		peer_cert_valid;
 
 	/*
-	 * OpenSSL structures. (Keep these last so that the locations of other
-	 * fields are the same whether or not you build with OpenSSL.)
+	 * SSL backend specific structures. (Keep these last so that the locations
+	 * of other fields are the same whether or not you build with SSL
+	 * enabled.)
 	 */
 #ifdef USE_OPENSSL
 	SSL		   *ssl;
 	X509	   *peer;
 #endif
+
+#ifdef USE_NSS
+	void	   *pr_fd;
+#endif
 } Port;
 
 #ifdef USE_SSL
diff --git a/src/include/libpq/libpq.h b/src/include/libpq/libpq.h
index b1152475ac..298d87ecae 100644
--- a/src/include/libpq/libpq.h
+++ b/src/include/libpq/libpq.h
@@ -88,6 +88,9 @@ extern PGDLLIMPORT bool ssl_passphrase_command_supports_reload;
 #ifdef USE_SSL
 extern bool ssl_loaded_verify_locations;
 #endif
+#ifdef USE_NSS
+extern char *ssl_database;
+#endif
 
 extern int	secure_initialize(bool isServerStart);
 extern bool secure_loaded_verify_locations(void);
diff --git a/src/include/pg_config.h.in b/src/include/pg_config.h.in
index fb270df678..31f808398c 100644
--- a/src/include/pg_config.h.in
+++ b/src/include/pg_config.h.in
@@ -893,6 +893,9 @@
 /* Define to 1 to build with PAM support. (--with-pam) */
 #undef USE_PAM
 
+/* Define to build with NSS support (--with-nss) */
+#undef USE_NSS
+
 /* Define to 1 to use software CRC-32C implementation (slicing-by-8). */
 #undef USE_SLICING_BY_8_CRC32C
 
diff --git a/src/include/pg_config_manual.h b/src/include/pg_config_manual.h
index 705dc69c06..c28b84126d 100644
--- a/src/include/pg_config_manual.h
+++ b/src/include/pg_config_manual.h
@@ -176,10 +176,9 @@
 
 /*
  * USE_SSL code should be compiled only when compiling with an SSL
- * implementation.  (Currently, only OpenSSL is supported, but we might add
- * more implementations in the future.)
+ * implementation.
  */
-#ifdef USE_OPENSSL
+#if defined(USE_OPENSSL) || defined(USE_NSS)
 #define USE_SSL
 #endif
 
diff --git a/src/interfaces/libpq/Makefile b/src/interfaces/libpq/Makefile
index d4919970f8..97821fb39b 100644
--- a/src/interfaces/libpq/Makefile
+++ b/src/interfaces/libpq/Makefile
@@ -57,6 +57,10 @@ OBJS += \
 	fe-secure-gssapi.o
 endif
 
+ifeq ($(with_nss), yes)
+OBJS += fe-secure-nss.o
+endif
+
 ifeq ($(PORTNAME), cygwin)
 override shlib = cyg$(NAME)$(DLSUFFIX)
 endif
diff --git a/src/interfaces/libpq/fe-connect.c b/src/interfaces/libpq/fe-connect.c
index 7bee9dd201..2814eb8ddd 100644
--- a/src/interfaces/libpq/fe-connect.c
+++ b/src/interfaces/libpq/fe-connect.c
@@ -354,6 +354,10 @@ static const internalPQconninfoOption PQconninfoOptions[] = {
 		"Target-Session-Attrs", "", 11, /* sizeof("read-write") = 11 */
 	offsetof(struct pg_conn, target_session_attrs)},
 
+	{"cert_database", NULL, NULL, NULL,
+		"CertificateDatabase", "", 64,
+	offsetof(struct pg_conn, cert_database)},
+
 	/* Terminating entry --- MUST BE LAST */
 	{NULL, NULL, NULL, NULL,
 	NULL, NULL, 0}
diff --git a/src/interfaces/libpq/fe-secure-nss.c b/src/interfaces/libpq/fe-secure-nss.c
new file mode 100644
index 0000000000..778393fc3b
--- /dev/null
+++ b/src/interfaces/libpq/fe-secure-nss.c
@@ -0,0 +1,984 @@
+/*-------------------------------------------------------------------------
+ *
+ * fe-secure-nss.c
+ *	  functions for supporting NSS as a TLS backend for frontend libpq
+ *
+ * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ *	  src/interfaces/libpq/fe-secure-nss.c
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#include "postgres_fe.h"
+
+#include "libpq-fe.h"
+#include "fe-auth.h"
+#include "libpq-int.h"
+
+/*
+ * BITS_PER_BYTE is also defined in the NSPR header fils, so we need to undef
+ * our version to avoid compiler warnings on redefinition.
+ */
+#define pg_BITS_PER_BYTE BITS_PER_BYTE
+#undef BITS_PER_BYTE
+
+/*
+ * The nspr/obsolete/protypes.h NSPR header typedefs uint64 and int64 with
+ * colliding definitions from ours, causing a much expected compiler error.
+ * The definitions are however not actually used in NSPR at all, and are only
+ * intended for what seems to be backwards compatibility for apps written
+ * against old versions of NSPR.  The following comment is in the referenced
+ * file, and was added in 1998:
+ *
+ *		This section typedefs the old 'native' types to the new PR<type>s.
+ *		These definitions are scheduled to be eliminated at the earliest
+ *		possible time. The NSPR API is implemented and documented using
+ *		the new definitions.
+ *
+ * As there is no opt-out from pulling in these typedefs, we define the guard
+ * for the file to exclude it. This is incredibly ugly, but seems to be about
+ * the only way around it.
+ */
+#define PROTYPES_H
+#include <nspr.h>
+#undef PROTYPES_H
+#include <nss.h>
+#include <ssl.h>
+#include <sslproto.h>
+#include <pk11func.h>
+#include <prerror.h>
+#include <prinit.h>
+#include <prio.h>
+#include <secerr.h>
+#include <secmod.h>
+
+/*
+ * Ensure that the colliding definitions match, else throw an error. In case
+ * NSPR remove the definition in a future version (however unlikely that may
+ * be, make sure to put ours back again.
+ */
+#if defined(BITS_PER_BYTE)
+#if BITS_PER_BYTE != pg_BITS_PER_BYTE
+#error "incompatible byte widths between NSPR and PostgreSQL"
+#endif
+#else
+#define BITS_PER_BYTE pg_BITS_PER_BYTE
+#endif
+#undef pg_BITS_PER_BYTE
+
+static SECStatus pg_load_nss_module(SECMODModule * *module, const char *library, const char *name);
+static SECStatus pg_bad_cert_handler(void *arg, PRFileDesc * fd);
+static char *pg_SSLerrmessage(PRErrorCode errcode);
+static SECStatus pg_client_auth_handler(void *arg, PRFileDesc * socket, CERTDistNames * caNames,
+										CERTCertificate * *pRetCert, SECKEYPrivateKey * *pRetKey);
+static SECStatus pg_cert_auth_handler(void *arg, PRFileDesc * fd, PRBool checksig, PRBool isServer);
+static int	ssl_protocol_version_to_nss(const char *protocol);
+static bool cert_database_has_CA(PGconn *conn);
+
+static char *PQssl_passwd_cb(PK11SlotInfo * slot, PRBool retry, void *arg);
+
+/*
+ * PR_ImportTCPSocket() is a private API, but very widely used, as it's the
+ * only way to make NSS use an already set up POSIX file descriptor rather
+ * than opening one itself. To quote the NSS documentation:
+ *
+ *		"In theory, code that uses PR_ImportTCPSocket may break when NSPR's
+ *		implementation changes. In practice, this is unlikely to happen because
+ *		NSPR's implementation has been stable for years and because of NSPR's
+ *		strong commitment to backward compatibility."
+ *
+ * https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSPR/Reference/PR_ImportTCPSocket
+ *
+ * The function is declared in <private/pprio.h>, but as it is a header marked
+ * private we declare it here rather than including it.
+ */
+NSPR_API(PRFileDesc *) PR_ImportTCPSocket(int);
+
+static SECMODModule * ca_trust = NULL;
+static NSSInitContext * nss_context = NULL;
+
+/*
+ * Track whether the NSS database has a password set or not. There is no API
+ * function for retrieving password status, so we simply flip this to true in
+ * case NSS invoked the password callback - as that will only happen in case
+ * there is a password. The reason for tracking this is that there are calls
+ * which require a password parameter, but doesn't use the callbacks provided,
+ * so we must call the callback on behalf of these.
+ */
+static bool has_password = false;
+
+#if defined(WIN32)
+static const char *ca_trust_name = "nssckbi.dll";
+#elif defined(__darwin__)
+static const char *ca_trust_name = "libnssckbi.dylib";
+#else
+static const char *ca_trust_name = "libnssckbi.so";
+#endif
+
+static PQsslKeyPassHook_nss_type PQsslKeyPassHook = NULL;
+
+/* ------------------------------------------------------------ */
+/*			 Procedures common to all secure sessions			*/
+/* ------------------------------------------------------------ */
+
+/*
+ * pgtls_init_library
+ *
+ * There is no direct equivalent for PQinitOpenSSL in NSS/NSPR, with PR_Init
+ * being the closest match there is. PR_Init is however already documented to
+ * not be required so simply making this a noop seems like the best option.
+ */
+void
+pgtls_init_library(bool do_ssl, int do_crypto)
+{
+	/* noop */
+}
+
+int
+pgtls_init(PGconn *conn)
+{
+	conn->ssl_in_use = false;
+
+	return 0;
+}
+
+void
+pgtls_close(PGconn *conn)
+{
+	if (nss_context)
+	{
+		NSS_ShutdownContext(nss_context);
+		nss_context = NULL;
+	}
+}
+
+PostgresPollingStatusType
+pgtls_open_client(PGconn *conn)
+{
+	SECStatus	status;
+	PRFileDesc *pr_fd;
+	PRFileDesc *model;
+	NSSInitParameters params;
+	SSLVersionRange desired_range;
+
+	/*
+	 * The NSPR documentation states that runtime initialization via PR_Init
+	 * is no longer required, as the first caller into NSPR will perform the
+	 * initialization implicitly. The documentation doesn't however clarify
+	 * from which version this is holds true, so let's perform the potentially
+	 * superfluous initialization anyways to avoid crashing on older versions
+	 * of NSPR, as there is no difference in overhead.  The NSS documentation
+	 * still states that PR_Init must be called in some way (implicitly or
+	 * explicitly).
+	 *
+	 * The below parameters are what the implicit initialization would've done
+	 * for us, and should work even for older versions where it might not be
+	 * done automatically. The last parameter, maxPTDs, is set to various
+	 * values in other codebases, but has been unused since NSPR 2.1 which was
+	 * released sometime in 1998.
+	 */
+	PR_Init(PR_USER_THREAD, PR_PRIORITY_NORMAL, 0);
+
+	/*
+	 * The original design of NSS was for a single application to use a single
+	 * copy of it, initialized with NSS_Initialize() which isn't returning any
+	 * handle with which to refer to NSS. NSS initialization and shutdown are
+	 * global for the application, so a shutdown in another NSS enabled
+	 * library would cause NSS to be stopped for libpq as well.  The fix has
+	 * been to introduce NSS_InitContext which returns a context handle to
+	 * pass to NSS_ShutdownContext.  NSS_InitContext was introduced in NSS
+	 * 3.12, but the use of it is not very well documented.
+	 * https://bugzilla.redhat.com/show_bug.cgi?id=738456
+	 *
+	 * The InitParameters struct passed can be used to override internal
+	 * values in NSS, but the usage is not documented at all. When using
+	 * NSS_Init initializations, the values are instead set via PK11_Configure
+	 * calls so the PK11_Configure documentation can be used to glean some
+	 * details on these.
+	 *
+	 * https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS/PKCS11/Module_Specs
+	 */
+	memset(&params, 0, sizeof(params));
+	params.length = sizeof(params);
+
+	if (conn->cert_database && strlen(conn->cert_database) > 0)
+	{
+		char	   *cert_database_path = psprintf("sql:%s", conn->cert_database);
+
+		nss_context = NSS_InitContext(cert_database_path, "", "", "",
+									  &params,
+									  NSS_INIT_READONLY | NSS_INIT_PK11RELOAD);
+		pfree(cert_database_path);
+	}
+	else
+		nss_context = NSS_InitContext("", "", "", "", &params,
+									  NSS_INIT_READONLY | NSS_INIT_NOCERTDB |
+									  NSS_INIT_NOMODDB | NSS_INIT_FORCEOPEN |
+									  NSS_INIT_NOROOTINIT | NSS_INIT_PK11RELOAD);
+
+	if (!nss_context)
+	{
+		char	   *err = pg_SSLerrmessage(PR_GetError());
+
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to %s certificate database: %s"),
+						  conn->cert_database ? "open" : "create",
+						  err);
+		free(err);
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * Configure cipher policy.
+	 */
+	status = NSS_SetDomesticPolicy();
+	if (status != SECSuccess)
+	{
+		char	   *err = pg_SSLerrmessage(PR_GetError());
+
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to configure cipher policy: %s"),
+						  err);
+		free(err);
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * If we don't have a certificate database, the system trust store is the
+	 * fallback we can use. If we fail to initialize that as well, we can
+	 * still attempt a connection as long as the sslmode isn't verify*.
+	 */
+	if (!conn->cert_database && conn->sslmode[0] == 'v')
+	{
+		status = pg_load_nss_module(&ca_trust, ca_trust_name, "\"Root Certificates\"");
+		/* status = pg_load_nss_module(&ca_trust, ca_trust_name, "trust"); */
+		if (status != SECSuccess)
+		{
+			char	   *err = pg_SSLerrmessage(PR_GetError());
+
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("WARNING: unable to load NSS trust module \"%s\" : %s"), ca_trust_name, err);
+			return PGRES_POLLING_FAILED;
+		}
+	}
+
+
+	PK11_SetPasswordFunc(PQssl_passwd_cb);
+
+	/*
+	 * Import the already opened socket as we don't want to use NSPR functions
+	 * for opening the network socket due to how the PostgreSQL protocol works
+	 * with TLS connections. This function is not part of the NSPR public API,
+	 * see the comment at the top of the file for the rationale of still using
+	 * it.
+	 */
+	pr_fd = PR_ImportTCPSocket(conn->sock);
+	if (!pr_fd)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to attach to socket: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * Most of the documentation available, and implementations of, NSS/NSPR
+	 * use the PR_NewTCPSocket() function here, which has the drawback that it
+	 * can only create IPv4 sockets. Instead use PR_OpenTCPSocket() which
+	 * copes with IPv6 as well.
+	 */
+	model = SSL_ImportFD(NULL, PR_OpenTCPSocket(conn->laddr.addr.ss_family));
+	if (!model)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to enable TLS: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/* Disable old protocol versions (SSLv2 and SSLv3) */
+	SSL_OptionSet(model, SSL_ENABLE_SSL2, PR_FALSE);
+	SSL_OptionSet(model, SSL_V2_COMPATIBLE_HELLO, PR_FALSE);
+	SSL_OptionSet(model, SSL_ENABLE_SSL3, PR_FALSE);
+
+#ifdef SSL_CBC_RANDOM_IV
+
+	/*
+	 * Enable protection against the BEAST attack in case the NSS library has
+	 * support for that. While SSLv3 is disabled, we may still allow TLSv1
+	 * which is affected. The option isn't documented as an SSL option, but as
+	 * an NSS environment variable.
+	 */
+	SSL_OptionSet(model, SSL_CBC_RANDOM_IV, PR_TRUE);
+#endif
+
+	/* Set us up as a TLS client for the handshake */
+	SSL_OptionSet(model, SSL_HANDSHAKE_AS_CLIENT, PR_TRUE);
+
+	/*
+	 * When setting the available protocols, we either use the user defined
+	 * configuration values, and if missing we accept whatever is the highest
+	 * version supported by the library as the max and only limit the range in
+	 * the other end at TLSv1.0. ssl_variant_stream is a ProtocolVariant enum
+	 * for Stream protocols, rather than datagram.
+	 */
+	SSL_VersionRangeGetSupported(ssl_variant_stream, &desired_range);
+	desired_range.min = SSL_LIBRARY_VERSION_TLS_1_0;
+
+	if (conn->ssl_min_protocol_version && strlen(conn->ssl_min_protocol_version) > 0)
+	{
+		int			ssl_min_ver = ssl_protocol_version_to_nss(conn->ssl_min_protocol_version);
+
+		if (ssl_min_ver == -1)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("invalid value \"%s\" for minimum version of SSL protocol\n"),
+							  conn->ssl_min_protocol_version);
+			return -1;
+		}
+
+		desired_range.min = ssl_min_ver;
+	}
+
+	if (conn->ssl_max_protocol_version && strlen(conn->ssl_max_protocol_version) > 0)
+	{
+		int			ssl_max_ver = ssl_protocol_version_to_nss(conn->ssl_max_protocol_version);
+
+		if (ssl_max_ver == -1)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("invalid value \"%s\" for maximum version of SSL protocol\n"),
+							  conn->ssl_max_protocol_version);
+			return -1;
+		}
+
+		desired_range.max = ssl_max_ver;
+	}
+
+	if (SSL_VersionRangeSet(model, &desired_range) != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to set allowed SSL protocol version range: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * Set up callback for verifying server certificates, as well as for how
+	 * to handle failed verifications.
+	 */
+	SSL_AuthCertificateHook(model, pg_cert_auth_handler, (void *) conn);
+	SSL_BadCertHook(model, pg_bad_cert_handler, (void *) conn);
+
+	/*
+	 * Convert the NSPR socket to an SSL socket. Ensuring the success of this
+	 * operation is critical as NSS SSL_* functions may return SECSuccess on
+	 * the socket even though SSL hasn't been enabled, which introduce a risk
+	 * of silent downgrades.
+	 */
+	conn->pr_fd = SSL_ImportFD(model, pr_fd);
+	if (!conn->pr_fd)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to configure client for TLS: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * The model can now we closed as we've applied the settings of the model
+	 * onto the real socket. From hereon we should only use conn->pr_fd.
+	 */
+	PR_Close(model);
+
+	/* Set the private data to be passed to the password callback */
+	SSL_SetPKCS11PinArg(conn->pr_fd, (void *) conn);
+
+	/*
+	 * If a CRL file has been specified, verify if it exists in the database
+	 * but don't fail in case it doesn't.
+	 */
+	if (conn->sslcrl && strlen(conn->sslcrl) > 0)
+	{
+		/* XXX: Implement me.. */
+	}
+
+	status = SSL_ResetHandshake(conn->pr_fd, PR_FALSE);
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to initiate handshake: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * Set callback for client authentication when requested by the server.
+	 */
+	SSL_GetClientAuthDataHook(conn->pr_fd, pg_client_auth_handler, (void *) conn);
+
+	/*
+	 * Specify which hostname we are expecting to talk to. This is required,
+	 * albeit mostly applies to when opening a connection to a traditional
+	 * http server it seems.
+	 */
+	SSL_SetURL(conn->pr_fd, (conn->connhost[conn->whichhost]).host);
+
+	do
+	{
+		status = SSL_ForceHandshake(conn->pr_fd);
+	}
+	while (status != SECSuccess && PR_GetError() == PR_WOULD_BLOCK_ERROR);
+
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("SSL error: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	conn->ssl_in_use = true;
+	return PGRES_POLLING_OK;
+}
+
+ssize_t
+pgtls_read(PGconn *conn, void *ptr, size_t len)
+{
+	PRInt32		nread;
+	PRErrorCode status;
+	int			read_errno = 0;
+
+	nread = PR_Recv(conn->pr_fd, ptr, len, 0, PR_INTERVAL_NO_WAIT);
+
+	/*
+	 * PR_Recv blocks until there is data to read or the timeout expires. Zero
+	 * is returned for closed connections, while -1 indicates an error within
+	 * the ongoing connection.
+	 */
+	if (nread == 0)
+	{
+		read_errno = ECONNRESET;
+		return -1;
+	}
+
+	if (nread == -1)
+	{
+		status = PR_GetError();
+
+		switch (status)
+		{
+			case PR_WOULD_BLOCK_ERROR:
+				read_errno = EINTR;
+				break;
+
+			case PR_IO_TIMEOUT_ERROR:
+				break;
+
+				/*
+				 * The error cases for PR_Recv are not documented, but can be
+				 * reverse engineered from _MD_unix_map_default_error() in the
+				 * NSPR code, defined in pr/src/md/unix/unix_errors.c.
+				 */
+			default:
+				printfPQExpBuffer(&conn->errorMessage,
+								  libpq_gettext("TLS read error: %s"),
+								  pg_SSLerrmessage(status));
+				break;
+		}
+	}
+
+	SOCK_ERRNO_SET(read_errno);
+	return (ssize_t) nread;
+}
+
+/*
+ * pgtls_read_pending
+ *		Check for the existence of data to be read.
+ *
+ * This is part of the PostgreSQL TLS backend API.
+ */
+bool
+pgtls_read_pending(PGconn *conn)
+{
+	unsigned char c;
+	int			n;
+
+	/*
+	 * PR_Recv peeks into the stream with the timeount turned off, to see if
+	 * there is another byte to read off the wire. There is an NSS function
+	 * SSL_DataPending() which might seem like a better fit, but it will only
+	 * check already encrypted data in the SSL buffer, not still unencrypted
+	 * data, thus it doesn't guarantee that a subsequent call to
+	 * PR_Read/PR_Recv wont block.
+	 */
+	n = PR_Recv(conn->pr_fd, &c, 1, PR_MSG_PEEK, PR_INTERVAL_NO_WAIT);
+	return (n > 0);
+}
+
+ssize_t
+pgtls_write(PGconn *conn, const void *ptr, size_t len)
+{
+	PRInt32		n;
+	PRErrorCode status;
+	int			write_errno = 0;
+
+	n = PR_Write(conn->pr_fd, ptr, len);
+
+	if (n < 0)
+	{
+		status = PR_GetError();
+
+		switch (status)
+		{
+			case PR_WOULD_BLOCK_ERROR:
+#ifdef EAGAIN
+				write_errno = EAGAIN;
+#else
+				write_errno = EINTR;
+#endif
+				break;
+
+			default:
+				printfPQExpBuffer(&conn->errorMessage,
+								  libpq_gettext("TLS write error: %s"),
+								  pg_SSLerrmessage(status));
+				write_errno = ECONNRESET;
+				break;
+		}
+	}
+
+	SOCK_ERRNO_SET(write_errno);
+	return (ssize_t) n;
+}
+
+/*
+ *	Verify that the server certificate matches the hostname we connected to.
+ *
+ * The certificate's Common Name and Subject Alternative Names are considered.
+ */
+int
+pgtls_verify_peer_name_matches_certificate_guts(PGconn *conn,
+												int *names_examined,
+												char **first_name)
+{
+	return 1;
+}
+
+/* ------------------------------------------------------------ */
+/*			PostgreSQL specific TLS support functions			*/
+/* ------------------------------------------------------------ */
+
+/*
+ * TODO: this a 99% copy of the same function in the backend, make these share
+ * a single implementation instead.
+ */
+static char *
+pg_SSLerrmessage(PRErrorCode errcode)
+{
+	const char *error;
+
+	error = PR_ErrorToName(errcode);
+	if (error)
+		return strdup(error);
+
+	return strdup("unknown TLS error");
+}
+
+static SECStatus
+pg_load_nss_module(SECMODModule * *module, const char *library, const char *name)
+{
+	SECMODModule *mod;
+	char	   *modulespec;
+
+	modulespec = psprintf("library=\"%s\", name=\"%s\"", library, name);
+
+	/*
+	 * Attempt to load the specified module. The second parameter is "parent"
+	 * which should always be NULL for application code. The third parameter
+	 * defines if loading should recurse which is only applicable when loading
+	 * a module from within another module. This hierarchy would have to be
+	 * defined in the modulespec, and since we don't support anything but
+	 * directly addressed modules we should pass PR_FALSE.
+	 */
+	mod = SECMOD_LoadUserModule(modulespec, NULL, PR_FALSE);
+	pfree(modulespec);
+
+	if (mod && mod->loaded)
+	{
+		*module = mod;
+		return SECSuccess;
+	}
+
+	SECMOD_DestroyModule(mod);
+	return SECFailure;
+}
+
+/* ------------------------------------------------------------ */
+/*						NSS Callbacks							*/
+/* ------------------------------------------------------------ */
+
+/*
+ * pg_cert_auth_handler
+ *			Callback for authenticating server certificate
+ *
+ * This is pretty much the same procedure as the SSL_AuthCertificate function
+ * provided by NSS, with the difference being server hostname validation. With
+ * SSL_AuthCertificate there is no way to do verify-ca, it only does the -full
+ * flavor of our sslmodes, so we need our own implementation.
+ */
+static SECStatus
+pg_cert_auth_handler(void *arg, PRFileDesc * fd, PRBool checksig, PRBool isServer)
+{
+	SECStatus	status;
+	PGconn	   *conn = (PGconn *) arg;
+	char	   *server_hostname = NULL;
+	CERTCertificate *server_cert;
+	void	   *pin;
+
+	Assert(!isServer);
+
+	pin = SSL_RevealPinArg(conn->pr_fd);
+	server_cert = SSL_PeerCertificate(conn->pr_fd);
+
+	status = CERT_VerifyCertificateNow((CERTCertDBHandle *) CERT_GetDefaultCertDB(), server_cert,
+									   checksig, certificateUsageSSLServer,
+									   pin, NULL);
+
+	/*
+	 * If we've already failed validation then there is no point in also
+	 * performing the hostname check for verify-full.
+	 */
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to verify certificate: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		goto done;
+	}
+
+	if (strcmp(conn->sslmode, "verify-full") == 0)
+	{
+		server_hostname = SSL_RevealURL(conn->pr_fd);
+		if (!server_hostname || server_hostname[0] == '\0')
+			goto done;
+
+		/*
+		 * CERT_VerifyCertName will internally perform RFC 2818 SubjectAltName
+		 * verification.
+		 */
+		status = CERT_VerifyCertName(server_cert, server_hostname);
+		if (status != SECSuccess)
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("unable to verify server hostname: %s"),
+							  pg_SSLerrmessage(PR_GetError()));
+
+	}
+
+done:
+	if (server_hostname)
+		PR_Free(server_hostname);
+
+	CERT_DestroyCertificate(server_cert);
+	return status;
+}
+
+/*
+ * pg_client_auth_handler
+ *		Callback for client certificate validation
+ *
+ * The client auth callback is not on by default in NSS, so we need to invoke
+ * it ourselves to ensure we can do cert authentication. A TODO is to support
+ * running without a specified sslcert parameter. By retrieving all the certs
+ * via nickname from the cert database and see if we find one which apply with
+ * NSS_CmpCertChainWCANames() and PK11_FindKeyByAnyCert() we could support
+ * just running with a ssl database specified.
+ *
+ * For now, we use the default client certificate validation which requires a
+ * defined nickname to identify the cert in the database.
+ */
+static SECStatus
+pg_client_auth_handler(void *arg, PRFileDesc * socket, CERTDistNames * caNames,
+					   CERTCertificate * *pRetCert, SECKEYPrivateKey * *pRetKey)
+{
+	PGconn	   *conn = (PGconn *) arg;
+
+	return NSS_GetClientAuthData(conn->sslcert, socket, caNames, pRetCert, pRetKey);
+}
+
+/*
+ * pg_bad_cert_handler
+ *		Callback for failed certificate validation
+ *
+ * The TLS handshake will call this function iff the server certificate failed
+ * validation. Depending on the sslmode, we allow the connection anyways.
+ */
+static SECStatus
+pg_bad_cert_handler(void *arg, PRFileDesc * fd)
+{
+	PGconn	   *conn = (PGconn *) arg;
+	PRErrorCode err;
+
+	/*
+	 * This really shouldn't happen, as we've the the PGconn object as our
+	 * callback data, and at the callsite we know it will be populated. That
+	 * being said, the NSS code itself performs this check even when it should
+	 * not be required so let's use the same belts with our suspenders.
+	 */
+	if (!arg)
+		return SECFailure;
+
+	/*
+	 * For sslmodes other than verify-full and verify-ca we don't perform peer
+	 * validation, so return immediately.  sslmode require with a database
+	 * specified which contains a CA certificate will work like verify-ca to
+	 * be compatible with the OpenSSL implementation.
+	 */
+	if (strcmp(conn->sslmode, "require") == 0)
+	{
+		if (conn->cert_database && strlen(conn->cert_database) > 0 && cert_database_has_CA(conn))
+			return SECFailure;
+	}
+	if (conn->sslmode[0] == 'v')
+		return SECFailure;
+
+	err = PORT_GetError();
+
+	/*
+	 * TODO: these are relevant error codes that can occur in certificate
+	 * validation, figure out which we dont want for require/prefer etc.
+	 */
+	switch (err)
+	{
+		case SEC_ERROR_INVALID_AVA:
+		case SEC_ERROR_INVALID_TIME:
+		case SEC_ERROR_BAD_SIGNATURE:
+		case SEC_ERROR_EXPIRED_CERTIFICATE:
+		case SEC_ERROR_UNKNOWN_ISSUER:
+		case SEC_ERROR_UNTRUSTED_ISSUER:
+		case SEC_ERROR_UNTRUSTED_CERT:
+		case SEC_ERROR_CERT_VALID:
+		case SEC_ERROR_EXPIRED_ISSUER_CERTIFICATE:
+		case SEC_ERROR_CRL_EXPIRED:
+		case SEC_ERROR_CRL_BAD_SIGNATURE:
+		case SEC_ERROR_EXTENSION_VALUE_INVALID:
+		case SEC_ERROR_CA_CERT_INVALID:
+		case SEC_ERROR_CERT_USAGES_INVALID:
+		case SEC_ERROR_UNKNOWN_CRITICAL_EXTENSION:
+			return SECSuccess;
+			break;
+		default:
+			return SECFailure;
+			break;
+	}
+
+	/* Unreachable */
+	return SECSuccess;
+}
+
+/* ------------------------------------------------------------ */
+/*					SSL information functions					*/
+/* ------------------------------------------------------------ */
+
+/*
+ * PQgetssl
+ *
+ * Return NULL as this is legacy and defined to always be equal to calling
+ * PQsslStruct(conn, "OpenSSL"); This should ideally trigger a logged warning
+ * somewhere as it's nonsensical to run in a non-OpenSSL build, but the color
+ * of said bikeshed hasn't yet been determined.
+ */
+void *
+PQgetssl(PGconn *conn)
+{
+	return NULL;
+}
+
+void *
+PQsslStruct(PGconn *conn, const char *struct_name)
+{
+	if (!conn)
+		return NULL;
+
+	/*
+	 * Return the underlying PRFileDesc which can be used to access
+	 * information on the connection details. There is no SSL context per se.
+	 */
+	if (strcmp(struct_name, "NSS") == 0)
+		return conn->pr_fd;
+	return NULL;
+}
+
+const char *const *
+PQsslAttributeNames(PGconn *conn)
+{
+	static const char *const result[] = {
+		"library",
+		"cipher",
+		"protocol",
+		"key_bits",
+		"compression",
+		NULL
+	};
+
+	return result;
+}
+
+const char *
+PQsslAttribute(PGconn *conn, const char *attribute_name)
+{
+	SECStatus	status;
+	SSLChannelInfo channel;
+	SSLCipherSuiteInfo suite;
+
+	if (!conn || !conn->pr_fd)
+		return NULL;
+
+	if (strcmp(attribute_name, "library") == 0)
+		return "NSS";
+
+	status = SSL_GetChannelInfo(conn->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+		return NULL;
+
+	status = SSL_GetCipherSuiteInfo(channel.cipherSuite, &suite, sizeof(suite));
+	if (status != SECSuccess)
+		return NULL;
+
+	if (strcmp(attribute_name, "cipher") == 0)
+		return suite.cipherSuiteName;
+
+	if (strcmp(attribute_name, "key_bits") == 0)
+	{
+		static char key_bits_str[8];
+
+		snprintf(key_bits_str, sizeof(key_bits_str), "%i", suite.effectiveKeyBits);
+		return key_bits_str;
+	}
+
+	if (strcmp(attribute_name, "protocol") == 0)
+	{
+		switch (channel.protocolVersion)
+		{
+#ifdef SSL_LIBRARY_VERSION_TLS_1_3
+			case SSL_LIBRARY_VERSION_TLS_1_3:
+				return "TLSv1.3";
+#endif
+#ifdef SSL_LIBRARY_VERSION_TLS_1_2
+			case SSL_LIBRARY_VERSION_TLS_1_2:
+				return "TLSv1.2";
+#endif
+#ifdef SSL_LIBRARY_VERSION_TLS_1_1
+			case SSL_LIBRARY_VERSION_TLS_1_1:
+				return "TLSv1.1";
+#endif
+			case SSL_LIBRARY_VERSION_TLS_1_0:
+				return "TLSv1.0";
+			default:
+				return "unknown";
+		}
+	}
+
+	/*
+	 * NSS disabled support for compression in version 3.33, and it was only
+	 * available for SSLv3 at that point anyways, so we can safely return off
+	 * here without checking.
+	 */
+	if (strcmp(attribute_name, "compression") == 0)
+		return "off";
+
+	return NULL;
+}
+
+static int
+ssl_protocol_version_to_nss(const char *protocol)
+{
+	if (pg_strcasecmp("TLSv1", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_0;
+
+#ifdef SSL_LIBRARY_VERSION_TLS_1_1
+	if (pg_strcasecmp("TLSv1.1", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_1;
+#endif
+
+#ifdef SSL_LIBRARY_VERSION_TLS_1_2
+	if (pg_strcasecmp("TLSv1.2", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_2;
+#endif
+
+#ifdef SSL_LIBRARY_VERSION_TLS_1_3
+	if (pg_strcasecmp("TLSv1.3", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_3;
+#endif
+
+	return -1;
+}
+
+static bool
+cert_database_has_CA(PGconn *conn)
+{
+	CERTCertList *certificates;
+	bool		hasCA;
+
+	/*
+	 * If the certificate database has a password we must provide it, since
+	 * this API doesn't invoke the standard password callback.
+	 */
+	if (has_password)
+		certificates = PK11_ListCerts(PK11CertListCA, PQssl_passwd_cb(NULL, PR_FALSE, (void *) conn));
+	else
+		certificates = PK11_ListCerts(PK11CertListCA, NULL);
+	hasCA = !CERT_LIST_EMPTY(certificates);
+	CERT_DestroyCertList(certificates);
+
+	return hasCA;
+}
+
+PQsslKeyPassHook_nss_type
+PQgetSSLKeyPassHook_nss(void)
+{
+	return PQsslKeyPassHook;
+}
+
+void
+PQsetSSLKeyPassHook_nss(PQsslKeyPassHook_nss_type hook)
+{
+	PQsslKeyPassHook = hook;
+}
+
+/*
+ * Supply a password to decrypt a client certificate.
+ *
+ * This must match NSS type PK11PasswordFunc.
+ */
+static char *
+PQssl_passwd_cb(PK11SlotInfo * slot, PRBool retry, void *arg)
+{
+	has_password = true;
+
+	if (PQsslKeyPassHook)
+		return PQsslKeyPassHook(slot, (PRBool) retry, arg);
+	else
+		return PQdefaultSSLKeyPassHook_nss(slot, retry, arg);
+}
+
+/*
+ * The default password handler callback.
+ */
+char *
+PQdefaultSSLKeyPassHook_nss(PK11SlotInfo * slot, PRBool retry, void *arg)
+{
+	PGconn	   *conn = (PGconn *) arg;
+
+	/*
+	 * If the password didn't work the first time there is no point in
+	 * retrying as it hasn't changed.
+	 */
+	if (retry != PR_TRUE && conn->sslpassword && strlen(conn->sslpassword) > 0)
+		return PORT_Strdup(conn->sslpassword);
+
+	return NULL;
+}
diff --git a/src/interfaces/libpq/fe-secure.c b/src/interfaces/libpq/fe-secure.c
index 3311fd7a5b..b6c92ece11 100644
--- a/src/interfaces/libpq/fe-secure.c
+++ b/src/interfaces/libpq/fe-secure.c
@@ -430,6 +430,9 @@ PQsslAttributeNames(PGconn *conn)
 
 	return result;
 }
+#endif /* USE_SSL */
+
+#ifndef USE_OPENSSL
 
 PQsslKeyPassHook_OpenSSL_type
 PQgetSSLKeyPassHook_OpenSSL(void)
@@ -448,7 +451,7 @@ PQdefaultSSLKeyPassHook_OpenSSL(char *buf, int size, PGconn *conn)
 {
 	return 0;
 }
-#endif							/* USE_SSL */
+#endif							/* USE_OPENSSL */
 
 /* Dummy version of GSSAPI information functions, when built without GSS support */
 #ifndef ENABLE_GSS
diff --git a/src/interfaces/libpq/libpq-fe.h b/src/interfaces/libpq/libpq-fe.h
index 3b6a9fbce3..27c16e187f 100644
--- a/src/interfaces/libpq/libpq-fe.h
+++ b/src/interfaces/libpq/libpq-fe.h
@@ -625,6 +625,17 @@ extern PQsslKeyPassHook_OpenSSL_type PQgetSSLKeyPassHook_OpenSSL(void);
 extern void PQsetSSLKeyPassHook_OpenSSL(PQsslKeyPassHook_OpenSSL_type hook);
 extern int	PQdefaultSSLKeyPassHook_OpenSSL(char *buf, int size, PGconn *conn);
 
+/* == in fe-secure-nss.c === */
+typedef struct PK11SlotInfoStr PK11SlotInfo;
+typedef int PRIntn;
+typedef PRIntn PRBool;
+
+/* Support for overriding sslpassword handling with a callback. */
+typedef char *(*PQsslKeyPassHook_nss_type) (PK11SlotInfo * slot, PRBool retry, void *arg);
+extern PQsslKeyPassHook_nss_type PQgetSSLKeyPassHook_nss(void);
+extern void PQsetSSLKeyPassHook_nss(PQsslKeyPassHook_nss_type hook);
+extern char *PQdefaultSSLKeyPassHook_nss(PK11SlotInfo * slot, PRBool retry, void *arg);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/src/interfaces/libpq/libpq-int.h b/src/interfaces/libpq/libpq-int.h
index 1de91ae295..12717ca720 100644
--- a/src/interfaces/libpq/libpq-int.h
+++ b/src/interfaces/libpq/libpq-int.h
@@ -362,6 +362,7 @@ struct pg_conn
 	char	   *sslpassword;	/* client key file password */
 	char	   *sslrootcert;	/* root certificate filename */
 	char	   *sslcrl;			/* certificate revocation list filename */
+	char	   *cert_database;
 	char	   *requirepeer;	/* required peer credentials for local sockets */
 	char	   *gssencmode;		/* GSS mode (require,prefer,disable) */
 	char	   *krbsrvname;		/* Kerberos service name */
@@ -485,6 +486,10 @@ struct pg_conn
 								 * OpenSSL version changes */
 #endif
 #endif							/* USE_OPENSSL */
+
+#ifdef USE_NSS
+	void	   *pr_fd;
+#endif							/* USE_NSS */
 #endif							/* USE_SSL */
 
 #ifdef ENABLE_GSS
diff --git a/src/test/Makefile b/src/test/Makefile
index efb206aa75..d18f5a083b 100644
--- a/src/test/Makefile
+++ b/src/test/Makefile
@@ -27,7 +27,7 @@ ifneq (,$(filter ldap,$(PG_TEST_EXTRA)))
 SUBDIRS += ldap
 endif
 endif
-ifeq ($(with_openssl),yes)
+ifeq ($(with_ssl),yes)
 ifneq (,$(filter ssl,$(PG_TEST_EXTRA)))
 SUBDIRS += ssl
 endif
diff --git a/src/test/ssl/Makefile b/src/test/ssl/Makefile
index 777ee39413..fe265e2dbd 100644
--- a/src/test/ssl/Makefile
+++ b/src/test/ssl/Makefile
@@ -14,6 +14,7 @@ top_builddir = ../../..
 include $(top_builddir)/src/Makefile.global
 
 export with_openssl
+export with_nss
 
 CERTIFICATES := server_ca server-cn-and-alt-names \
 	server-cn-only server-single-alt-name server-multiple-alt-names \
@@ -30,6 +31,32 @@ SSLFILES := $(CERTIFICATES:%=ssl/%.key) $(CERTIFICATES:%=ssl/%.crt) \
 	ssl/client+client_ca.crt ssl/client-der.key \
 	ssl/client-encrypted-pem.key ssl/client-encrypted-der.key
 
+# Even though we in practice could get away with far fewer NSS databases, they
+# are generated to mimick the setup for the OpenSSL tests in order to ensure
+# we isolate the same behavior between the backends. The database name should
+# contain the files included for easier test suite code reading.
+NSSFILES := ssl/nss/client_ca.crt.db \
+	ssl/nss/server_ca.crt.db \
+	ssl/nss/root+server_ca.crt.db \
+	ssl/nss/root+client_ca.crt.db \
+	ssl/nss/client.crt__client.key.db \
+	ssl/nss/client-revoked.crt__client-revoked.key.db \
+	ssl/nss/server-cn-only.crt__server-password.key.db \
+	ssl/nss/server-cn-only.crt__server-cn-only.key.db \
+	ssl/nss/root.crl \
+	ssl/nss/server.crl \
+	ssl/nss/client.crl \
+	ssl/nss/server-multiple-alt-names.crt__server-multiple-alt-names.key.db \
+	ssl/nss/server-single-alt-name.crt__server-single-alt-name.key.db \
+	ssl/nss/server-cn-and-alt-names.crt__server-cn-and-alt-names.key.db \
+	ssl/nss/server-no-names.crt__server-no-names.key.db \
+	ssl/nss/server-revoked.crt__server-revoked.key.db \
+	ssl/nss/root+client.crl \
+	ssl/nss/client+client_ca.crt__client.key.db \
+	ssl/nss/client.crt__client-encrypted-pem.key.db \
+	ssl/nss/root+server_ca.crt__server.crl.db \
+	ssl/nss/root+server_ca.crt__root+server.crl.db
+
 # This target re-generates all the key and certificate files. Usually we just
 # use the ones that are committed to the tree without rebuilding them.
 #
@@ -37,6 +64,10 @@ SSLFILES := $(CERTIFICATES:%=ssl/%.key) $(CERTIFICATES:%=ssl/%.crt) \
 #
 sslfiles: $(SSLFILES)
 
+# Generate NSS certificate databases corresponding to the OpenSSL certificates.
+# This target will fail unless preceded by nssfiles-clean.
+nssfiles: $(NSSFILES)
+
 # OpenSSL requires a directory to put all generated certificates in. We don't
 # use this for anything, but we need a location.
 ssl/new_certs_dir:
@@ -64,6 +95,24 @@ ssl/%_ca.crt: ssl/%_ca.key %_ca.config ssl/root_ca.crt ssl/new_certs_dir
 	rm ssl/temp_ca.crt ssl/temp_ca_signed.crt
 	echo "01" > ssl/$*_ca.srl
 
+ssl/nss/%_ca.crt.db: ssl/%_ca.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n $*_ca.crt -i ssl/$*_ca.crt -t "CT,C,C"
+
+ssl/nss/root+server_ca.crt__server.crl.db: ssl/root+server_ca.crt ssl/nss/server.crl
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	crlutil -I -i ssl/nss/server.crl -d $@ -B
+
+ssl/nss/root+server_ca.crt__root+server.crl.db: ssl/root+server_ca.crt ssl/nss/root.crl ssl/nss/server.crl
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	crlutil -I -i ssl/nss/root.crl -d $@ -B
+	crlutil -I -i ssl/nss/server.crl -d $@ -B
+
 # Server certificates, signed by server CA:
 ssl/server-%.crt: ssl/server-%.key ssl/server_ca.crt server-%.config
 	openssl req -new -key ssl/server-$*.key -out ssl/server-$*.csr -config server-$*.config
@@ -77,6 +126,74 @@ ssl/server-ss.crt: ssl/server-cn-only.key ssl/server-cn-only.crt server-cn-only.
 	openssl x509 -req -days 10000 -in ssl/server-ss.csr -signkey ssl/server-cn-only.key -out ssl/server-ss.crt  -extensions v3_req -extfile server-cn-only.config
 	rm ssl/server-ss.csr
 
+ssl/nss/server-cn-only.crt__server-password.key.db: ssl/server-cn-only.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-cn-only.crt -i ssl/server-cn-only.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-password.pfx -inkey ssl/server-password.key -in ssl/server-cn-only.crt -certfile ssl/server_ca.crt -passin 'pass:secret1' -passout pass:
+	pk12util -i ssl/nss/server-password.pfx -d $@ -W ''
+
+ssl/nss/server-cn-only.crt__server-cn-only.key.db: ssl/server-cn-only.crt ssl/server-cn-only.key
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-cn-only.crt -i ssl/server-cn-only.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-cn-only.pfx -inkey ssl/server-cn-only.key -in ssl/server-cn-only.crt -certfile ssl/server_ca.crt -passout pass:
+	pk12util -i ssl/nss/server-cn-only.pfx -d $@ -W ''
+
+ssl/nss/server-multiple-alt-names.crt__server-multiple-alt-names.key.db: ssl/server-multiple-alt-names.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-multiple-alt-names.crt -i ssl/server-multiple-alt-names.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-multiple-alt-names.pfx -inkey ssl/server-multiple-alt-names.key -in ssl/server-multiple-alt-names.crt -certfile ssl/server-multiple-alt-names.crt -passout pass:
+	pk12util -i ssl/nss/server-multiple-alt-names.pfx -d $@ -W ''
+
+ssl/nss/server-single-alt-name.crt__server-single-alt-name.key.db: ssl/server-single-alt-name.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-single-alt-name.crt -i ssl/server-single-alt-name.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-single-alt-name.pfx -inkey ssl/server-single-alt-name.key -in ssl/server-single-alt-name.crt -certfile ssl/server-single-alt-name.crt -passout pass:
+	pk12util -i ssl/nss/server-single-alt-name.pfx -d $@ -W ''
+
+ssl/nss/server-cn-and-alt-names.crt__server-cn-and-alt-names.key.db: ssl/server-cn-and-alt-names.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-cn-and-alt-names.crt -i ssl/server-cn-and-alt-names.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-cn-and-alt-names.pfx -inkey ssl/server-cn-and-alt-names.key -in ssl/server-cn-and-alt-names.crt -certfile ssl/server-cn-and-alt-names.crt -passout pass:
+	pk12util -i ssl/nss/server-cn-and-alt-names.pfx -d $@ -W ''
+
+ssl/nss/server-no-names.crt__server-no-names.key.db: ssl/server-no-names.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-no-names.crt -i ssl/server-no-names.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-no-names.pfx -inkey ssl/server-no-names.key -in ssl/server-no-names.crt -certfile ssl/server-no-names.crt -passout pass:
+	pk12util -i ssl/nss/server-no-names.pfx -d $@ -W ''
+
+ssl/nss/server-revoked.crt__server-revoked.key.db: ssl/server-revoked.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-revoked.crt -i ssl/server-revoked.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-revoked.pfx -inkey ssl/server-revoked.key -in ssl/server-revoked.crt -certfile ssl/server-revoked.crt -passout pass:
+	pk12util -i ssl/nss/server-revoked.pfx -d $@ -W ''
+
 # Password-protected version of server-cn-only.key
 ssl/server-password.key: ssl/server-cn-only.key
 	openssl rsa -aes256 -in $< -out $@ -passout 'pass:secret1'
@@ -88,6 +205,27 @@ ssl/client.crt: ssl/client.key ssl/client_ca.crt
 	openssl x509 -in ssl/temp.crt -out ssl/client.crt # to keep just the PEM cert
 	rm ssl/client.csr ssl/temp.crt
 
+# Client certificate, signed by client CA
+ssl/nss/client.crt__client.key.db: ssl/client.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/client.crt -i ssl/client.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root+client_ca.crt -i ssl/root+client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client.pfx -inkey ssl/client.key -in ssl/client.crt -certfile ssl/client_ca.crt -passout pass:
+	pk12util -i ssl/nss/client.pfx -d $@ -W ''
+
+# Client certificate with encrypted key, signed by client CA
+ssl/nss/client.crt__client-encrypted-pem.key.db: ssl/client.crt
+	$(MKDIR_P) $@
+	echo 'dUmmyP^#+' > $@.pass
+	certutil -d "sql:$@" -N -f $@.pass
+	certutil -d "sql:$@" -A -f $@.pass -n ssl/client.crt -i ssl/client.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -f $@.pass -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -f $@.pass -n root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client-encrypted-pem.pfx -inkey ssl/client-encrypted-pem.key -in ssl/client.crt -certfile ssl/client_ca.crt -passin pass:'dUmmyP^#+' -passout pass:'dUmmyP^#+'
+	pk12util -i ssl/nss/client-encrypted-pem.pfx -d $@ -W 'dUmmyP^#+' -k $@.pass
+
 # Another client certificate, signed by the client CA. This one is revoked.
 ssl/client-revoked.crt: ssl/client-revoked.key ssl/client_ca.crt client.config
 	openssl req -new -key ssl/client-revoked.key -out ssl/client-revoked.csr -config client.config
@@ -95,6 +233,14 @@ ssl/client-revoked.crt: ssl/client-revoked.key ssl/client_ca.crt client.config
 	openssl x509 -in ssl/temp.crt -out ssl/client-revoked.crt # to keep just the PEM cert
 	rm ssl/client-revoked.csr ssl/temp.crt
 
+ssl/nss/client-revoked.crt__client-revoked.key.db: ssl/client-revoked.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/client-revoked.crt -i ssl/client-revoked.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client-revoked.pfx -inkey ssl/client-revoked.key -in ssl/client-revoked.crt -certfile ssl/client_ca.crt -passout pass:
+	pk12util -i ssl/nss/client-revoked.pfx -d $@ -W ''
+
 # Convert the key to DER, to test our behaviour there too
 ssl/client-der.key: ssl/client.key
 	openssl rsa -in ssl/client.key -outform DER -out ssl/client-der.key
@@ -127,19 +273,40 @@ ssl/root+client_ca.crt: ssl/root_ca.crt ssl/client_ca.crt
 ssl/client+client_ca.crt: ssl/client.crt ssl/client_ca.crt
 	cat $^ > $@
 
+# Client certificate, signed by client CA
+ssl/nss/client+client_ca.crt__client.key.db: ssl/client+client_ca.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/client+client_ca.crt -i ssl/client+client_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n ssl/root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client.pfx -inkey ssl/client.key -in ssl/client.crt -certfile ssl/client_ca.crt -passout pass:
+	pk12util -i ssl/nss/client.pfx -d $@ -W ''
+
 #### CRLs
 
 ssl/client.crl: ssl/client-revoked.crt
 	openssl ca -config cas.config -name client_ca -revoke ssl/client-revoked.crt
 	openssl ca -config cas.config -name client_ca -gencrl -out ssl/client.crl
 
+ssl/nss/client.crl: ssl/client.crl
+	openssl crl -in $^ -outform der -out $@
+
 ssl/server.crl: ssl/server-revoked.crt
 	openssl ca -config cas.config -name server_ca -revoke ssl/server-revoked.crt
 	openssl ca -config cas.config -name server_ca -gencrl -out ssl/server.crl
 
+ssl/nss/server.crl: ssl/server.crl
+	openssl crl -in $^ -outform der -out $@
+
 ssl/root.crl: ssl/root_ca.crt
 	openssl ca -config cas.config -name root_ca -gencrl -out ssl/root.crl
 
+ssl/nss/root.crl: ssl/root.crl
+	openssl crl -in $^ -outform der -out $@
+
+ssl/nss/root+client.crl: ssl/root+client.crl
+	openssl crl -in $^ -outform der -out $@
+
 # If a CRL is used, OpenSSL requires a CRL file for *all* the CAs in the
 # chain, even if some of them are empty.
 ssl/root+server.crl: ssl/root.crl ssl/server.crl
@@ -151,9 +318,14 @@ ssl/root+client.crl: ssl/root.crl ssl/client.crl
 sslfiles-clean:
 	rm -f $(SSLFILES) ssl/client_ca.srl ssl/server_ca.srl ssl/client_ca-certindex* ssl/server_ca-certindex* ssl/root_ca-certindex* ssl/root_ca.srl ssl/temp_ca.crt ssl/temp_ca_signed.crt
 
+.PHONY: nssfiles-clean
+nssfiles-clean:
+	rm -rf ssl/nss
+
 clean distclean maintainer-clean:
 	rm -rf tmp_check
 	rm -rf ssl/*.old ssl/new_certs_dir ssl/client*_tmp.key
+	rm -rf ssl/nss
 
 # Doesn't depend on $(SSLFILES) because we don't rebuild them by default
 check:
diff --git a/src/test/ssl/ssl/nss/client+client_ca.crt__client.key.db/cert9.db b/src/test/ssl/ssl/nss/client+client_ca.crt__client.key.db/cert9.db
new file mode 100644
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diff --git a/src/test/ssl/ssl/nss/client+client_ca.crt__client.key.db/key4.db b/src/test/ssl/ssl/nss/client+client_ca.crt__client.key.db/key4.db
new file mode 100644
index 0000000000000000000000000000000000000000..44e6fcf5307a8b2e6cbf9878b157d7cb3e3a3f25
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literal 0
HcmV?d00001

diff --git a/src/test/ssl/ssl/nss/client+client_ca.crt__client.key.db/pkcs11.txt b/src/test/ssl/ssl/nss/client+client_ca.crt__client.key.db/pkcs11.txt
new file mode 100644
index 0000000000..dfffe92b90
--- /dev/null
+++ b/src/test/ssl/ssl/nss/client+client_ca.crt__client.key.db/pkcs11.txt
@@ -0,0 +1,5 @@
+library=
+name=NSS Internal PKCS #11 Module
+parameters=configdir='sql:ssl/nss/client+client_ca.crt__client.key.db' certPrefix='' keyPrefix='' secmod='secmod.db' flags= updatedir='' updateCertPrefix='' updateKeyPrefix='' updateid='' updateTokenDescription='' 
+NSS=Flags=internal,critical trustOrder=75 cipherOrder=100 slotParams=(1={slotFlags=[ECC,RSA,DSA,DH,RC2,RC4,DES,RANDOM,SHA1,MD5,MD2,SSL,TLS,AES,Camellia,SEED,SHA256,SHA512] askpw=any timeout=30})
+
diff --git a/src/test/ssl/ssl/nss/client-encrypted-pem.pfx b/src/test/ssl/ssl/nss/client-encrypted-pem.pfx
new file mode 100644
index 0000000000000000000000000000000000000000..4472d88ab737eb98c25d0e5fdc5124533529089d
GIT binary patch
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new file mode 100644
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new file mode 100644
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HcmV?d00001

diff --git a/src/test/ssl/ssl/nss/client-revoked.crt__client-revoked.key.db/pkcs11.txt b/src/test/ssl/ssl/nss/client-revoked.crt__client-revoked.key.db/pkcs11.txt
new file mode 100644
index 0000000000..67ce598fd3
--- /dev/null
+++ b/src/test/ssl/ssl/nss/client-revoked.crt__client-revoked.key.db/pkcs11.txt
@@ -0,0 +1,5 @@
+library=
+name=NSS Internal PKCS #11 Module
+parameters=configdir='sql:ssl/nss/client-revoked.crt__client-revoked.key.db' certPrefix='' keyPrefix='' secmod='secmod.db' flags= updatedir='' updateCertPrefix='' updateKeyPrefix='' updateid='' updateTokenDescription='' 
+NSS=Flags=internal,critical trustOrder=75 cipherOrder=100 slotParams=(1={slotFlags=[ECC,RSA,DSA,DH,RC2,RC4,DES,RANDOM,SHA1,MD5,MD2,SSL,TLS,AES,Camellia,SEED,SHA256,SHA512] askpw=any timeout=30})
+
diff --git a/src/test/ssl/ssl/nss/client-revoked.pfx b/src/test/ssl/ssl/nss/client-revoked.pfx
new file mode 100644
index 0000000000000000000000000000000000000000..1ddd9ff2823a5625b32e538ae91d029df841bfeb
GIT binary patch
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diff --git a/src/test/ssl/ssl/nss/client.crl b/src/test/ssl/ssl/nss/client.crl
new file mode 100644
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GIT binary patch
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literal 0
HcmV?d00001

diff --git a/src/test/ssl/ssl/nss/client.crt__client-encrypted-pem.key.db.pass b/src/test/ssl/ssl/nss/client.crt__client-encrypted-pem.key.db.pass
new file mode 100644
index 0000000000..3ac5759692
--- /dev/null
+++ b/src/test/ssl/ssl/nss/client.crt__client-encrypted-pem.key.db.pass
@@ -0,0 +1 @@
+dUmmyP^#+
diff --git a/src/test/ssl/ssl/nss/client.crt__client-encrypted-pem.key.db/cert9.db b/src/test/ssl/ssl/nss/client.crt__client-encrypted-pem.key.db/cert9.db
new file mode 100644
index 0000000000000000000000000000000000000000..969d719dcc131dba358d25d9bcc6ba2c5db0ff6b
GIT binary patch
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diff --git a/src/test/ssl/ssl/nss/client.crt__client-encrypted-pem.key.db/pkcs11.txt b/src/test/ssl/ssl/nss/client.crt__client-encrypted-pem.key.db/pkcs11.txt
new file mode 100644
index 0000000000..190f880c0a
--- /dev/null
+++ b/src/test/ssl/ssl/nss/client.crt__client-encrypted-pem.key.db/pkcs11.txt
@@ -0,0 +1,5 @@
+library=
+name=NSS Internal PKCS #11 Module
+parameters=configdir='sql:ssl/nss/client.crt__client-encrypted-pem.key.db' certPrefix='' keyPrefix='' secmod='secmod.db' flags= updatedir='' updateCertPrefix='' updateKeyPrefix='' updateid='' updateTokenDescription='' 
+NSS=Flags=internal,critical trustOrder=75 cipherOrder=100 slotParams=(1={slotFlags=[ECC,RSA,DSA,DH,RC2,RC4,DES,RANDOM,SHA1,MD5,MD2,SSL,TLS,AES,Camellia,SEED,SHA256,SHA512] askpw=any timeout=30})
+
diff --git a/src/test/ssl/ssl/nss/client.crt__client.key.db/cert9.db b/src/test/ssl/ssl/nss/client.crt__client.key.db/cert9.db
new file mode 100644
index 0000000000000000000000000000000000000000..6c8ec171304048a2a1c7aa14965b30cb7bea2ec8
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diff --git a/src/test/ssl/ssl/nss/client.crt__client.key.db/key4.db b/src/test/ssl/ssl/nss/client.crt__client.key.db/key4.db
new file mode 100644
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diff --git a/src/test/ssl/ssl/nss/client.crt__client.key.db/pkcs11.txt b/src/test/ssl/ssl/nss/client.crt__client.key.db/pkcs11.txt
new file mode 100644
index 0000000000..3f0a9ff5b5
--- /dev/null
+++ b/src/test/ssl/ssl/nss/client.crt__client.key.db/pkcs11.txt
@@ -0,0 +1,5 @@
+library=
+name=NSS Internal PKCS #11 Module
+parameters=configdir='sql:ssl/nss/client.crt__client.key.db' certPrefix='' keyPrefix='' secmod='secmod.db' flags= updatedir='' updateCertPrefix='' updateKeyPrefix='' updateid='' updateTokenDescription='' 
+NSS=Flags=internal,critical trustOrder=75 cipherOrder=100 slotParams=(1={slotFlags=[ECC,RSA,DSA,DH,RC2,RC4,DES,RANDOM,SHA1,MD5,MD2,SSL,TLS,AES,Camellia,SEED,SHA256,SHA512] askpw=any timeout=30})
+
diff --git a/src/test/ssl/ssl/nss/client.pfx b/src/test/ssl/ssl/nss/client.pfx
new file mode 100644
index 0000000000000000000000000000000000000000..9c5f5bb3e5ce60d158e87d7b9b114f29991a7d32
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diff --git a/src/test/ssl/ssl/nss/client_ca.crt.db/cert9.db b/src/test/ssl/ssl/nss/client_ca.crt.db/cert9.db
new file mode 100644
index 0000000000000000000000000000000000000000..710f74aae2716883ec8e8bc4f8490b5f37063abd
GIT binary patch
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literal 0
HcmV?d00001

diff --git a/src/test/ssl/ssl/nss/client_ca.crt.db/key4.db b/src/test/ssl/ssl/nss/client_ca.crt.db/key4.db
new file mode 100644
index 0000000000000000000000000000000000000000..13d47f000664f2003064ae9110f2f5a07013494d
GIT binary patch
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HcmV?d00001

diff --git a/src/test/ssl/ssl/nss/client_ca.crt.db/pkcs11.txt b/src/test/ssl/ssl/nss/client_ca.crt.db/pkcs11.txt
new file mode 100644
index 0000000000..212e72edeb
--- /dev/null
+++ b/src/test/ssl/ssl/nss/client_ca.crt.db/pkcs11.txt
@@ -0,0 +1,5 @@
+library=
+name=NSS Internal PKCS #11 Module
+parameters=configdir='sql:ssl/nss/client_ca.crt.db' certPrefix='' keyPrefix='' secmod='secmod.db' flags= updatedir='' updateCertPrefix='' updateKeyPrefix='' updateid='' updateTokenDescription='' 
+NSS=Flags=internal,critical trustOrder=75 cipherOrder=100 slotParams=(1={slotFlags=[ECC,RSA,DSA,DH,RC2,RC4,DES,RANDOM,SHA1,MD5,MD2,SSL,TLS,AES,Camellia,SEED,SHA256,SHA512] askpw=any timeout=30})
+
diff --git a/src/test/ssl/ssl/nss/root+client.crl b/src/test/ssl/ssl/nss/root+client.crl
new file mode 100644
index 0000000000000000000000000000000000000000..1d345a098f4488bc747deaa0ef788d7168beb7c7
GIT binary patch
literal 393
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literal 0
HcmV?d00001

diff --git a/src/test/ssl/ssl/nss/root+client_ca.crt.db/cert9.db b/src/test/ssl/ssl/nss/root+client_ca.crt.db/cert9.db
new file mode 100644
index 0000000000000000000000000000000000000000..480e281015f26cae72cf86ba29e62a4fac1288bf
GIT binary patch
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literal 0
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diff --git a/src/test/ssl/ssl/nss/root+client_ca.crt.db/key4.db b/src/test/ssl/ssl/nss/root+client_ca.crt.db/key4.db
new file mode 100644
index 0000000000000000000000000000000000000000..65f7eb7f0b7bf0b581fab253b06484fe09083650
GIT binary patch
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literal 0
HcmV?d00001

diff --git a/src/test/ssl/ssl/nss/root+client_ca.crt.db/pkcs11.txt b/src/test/ssl/ssl/nss/root+client_ca.crt.db/pkcs11.txt
new file mode 100644
index 0000000000..bdbedc732b
--- /dev/null
+++ b/src/test/ssl/ssl/nss/root+client_ca.crt.db/pkcs11.txt
@@ -0,0 +1,5 @@
+library=
+name=NSS Internal PKCS #11 Module
+parameters=configdir='sql:ssl/nss/root+client_ca.crt.db' certPrefix='' keyPrefix='' secmod='secmod.db' flags= updatedir='' updateCertPrefix='' updateKeyPrefix='' updateid='' updateTokenDescription='' 
+NSS=Flags=internal,critical trustOrder=75 cipherOrder=100 slotParams=(1={slotFlags=[ECC,RSA,DSA,DH,RC2,RC4,DES,RANDOM,SHA1,MD5,MD2,SSL,TLS,AES,Camellia,SEED,SHA256,SHA512] askpw=any timeout=30})
+
diff --git a/src/test/ssl/ssl/nss/root+server_ca.crt.db/cert9.db b/src/test/ssl/ssl/nss/root+server_ca.crt.db/cert9.db
new file mode 100644
index 0000000000000000000000000000000000000000..cdec09a0dbe8b127c8725dc180b281a355da3530
GIT binary patch
literal 28672
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diff --git a/src/test/ssl/ssl/nss/root+server_ca.crt.db/key4.db b/src/test/ssl/ssl/nss/root+server_ca.crt.db/key4.db
new file mode 100644
index 0000000000000000000000000000000000000000..d7704c2b80a3a607f026118c205c48afbb98bfe8
GIT binary patch
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diff --git a/src/test/ssl/ssl/nss/root+server_ca.crt.db/pkcs11.txt b/src/test/ssl/ssl/nss/root+server_ca.crt.db/pkcs11.txt
new file mode 100644
index 0000000000..5d04ea23ce
--- /dev/null
+++ b/src/test/ssl/ssl/nss/root+server_ca.crt.db/pkcs11.txt
@@ -0,0 +1,5 @@
+library=
+name=NSS Internal PKCS #11 Module
+parameters=configdir='sql:ssl/nss/root+server_ca.crt.db' certPrefix='' keyPrefix='' secmod='secmod.db' flags= updatedir='' updateCertPrefix='' updateKeyPrefix='' updateid='' updateTokenDescription='' 
+NSS=Flags=internal,critical trustOrder=75 cipherOrder=100 slotParams=(1={slotFlags=[ECC,RSA,DSA,DH,RC2,RC4,DES,RANDOM,SHA1,MD5,MD2,SSL,TLS,AES,Camellia,SEED,SHA256,SHA512] askpw=any timeout=30})
+
diff --git a/src/test/ssl/ssl/nss/root+server_ca.crt__root+server.crl.db/cert9.db b/src/test/ssl/ssl/nss/root+server_ca.crt__root+server.crl.db/cert9.db
new file mode 100644
index 0000000000000000000000000000000000000000..433b1b91c6a7891f52cdcd3f87655486798c5b99
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diff --git a/src/test/ssl/ssl/nss/root+server_ca.crt__root+server.crl.db/key4.db b/src/test/ssl/ssl/nss/root+server_ca.crt__root+server.crl.db/key4.db
new file mode 100644
index 0000000000000000000000000000000000000000..065152e027a94fc9ba48159ed8cfa0fc22a131c9
GIT binary patch
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diff --git a/src/test/ssl/ssl/nss/root+server_ca.crt__root+server.crl.db/pkcs11.txt b/src/test/ssl/ssl/nss/root+server_ca.crt__root+server.crl.db/pkcs11.txt
new file mode 100644
index 0000000000..9e34f7d8ea
--- /dev/null
+++ b/src/test/ssl/ssl/nss/root+server_ca.crt__root+server.crl.db/pkcs11.txt
@@ -0,0 +1,5 @@
+library=
+name=NSS Internal PKCS #11 Module
+parameters=configdir='sql:ssl/nss/root+server_ca.crt__root+server.crl.db' certPrefix='' keyPrefix='' secmod='secmod.db' flags= updatedir='' updateCertPrefix='' updateKeyPrefix='' updateid='' updateTokenDescription='' 
+NSS=Flags=internal,critical trustOrder=75 cipherOrder=100 slotParams=(1={slotFlags=[ECC,RSA,DSA,DH,RC2,RC4,DES,RANDOM,SHA1,MD5,MD2,SSL,TLS,AES,Camellia,SEED,SHA256,SHA512] askpw=any timeout=30})
+
diff --git a/src/test/ssl/ssl/nss/root+server_ca.crt__server.crl.db/cert9.db b/src/test/ssl/ssl/nss/root+server_ca.crt__server.crl.db/cert9.db
new file mode 100644
index 0000000000000000000000000000000000000000..dba82085f965c11ae464328fb65e8017f3b8199a
GIT binary patch
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literal 0
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diff --git a/src/test/ssl/ssl/nss/root+server_ca.crt__server.crl.db/key4.db b/src/test/ssl/ssl/nss/root+server_ca.crt__server.crl.db/key4.db
new file mode 100644
index 0000000000000000000000000000000000000000..de0f7b37cc0bb1e6b656089aea58a8916d64b3f1
GIT binary patch
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literal 0
HcmV?d00001

diff --git a/src/test/ssl/ssl/nss/root+server_ca.crt__server.crl.db/pkcs11.txt b/src/test/ssl/ssl/nss/root+server_ca.crt__server.crl.db/pkcs11.txt
new file mode 100644
index 0000000000..b54121fc4e
--- /dev/null
+++ b/src/test/ssl/ssl/nss/root+server_ca.crt__server.crl.db/pkcs11.txt
@@ -0,0 +1,5 @@
+library=
+name=NSS Internal PKCS #11 Module
+parameters=configdir='sql:ssl/nss/root+server_ca.crt__server.crl.db' certPrefix='' keyPrefix='' secmod='secmod.db' flags= updatedir='' updateCertPrefix='' updateKeyPrefix='' updateid='' updateTokenDescription='' 
+NSS=Flags=internal,critical trustOrder=75 cipherOrder=100 slotParams=(1={slotFlags=[ECC,RSA,DSA,DH,RC2,RC4,DES,RANDOM,SHA1,MD5,MD2,SSL,TLS,AES,Camellia,SEED,SHA256,SHA512] askpw=any timeout=30})
+
diff --git a/src/test/ssl/ssl/nss/root.crl b/src/test/ssl/ssl/nss/root.crl
new file mode 100644
index 0000000000000000000000000000000000000000..1d345a098f4488bc747deaa0ef788d7168beb7c7
GIT binary patch
literal 393
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literal 0
HcmV?d00001

diff --git a/src/test/ssl/ssl/nss/server-cn-and-alt-names.crt__server-cn-and-alt-names.key.db/cert9.db b/src/test/ssl/ssl/nss/server-cn-and-alt-names.crt__server-cn-and-alt-names.key.db/cert9.db
new file mode 100644
index 0000000000000000000000000000000000000000..6bccb020a17e1825bfc26b0de2213c63422bfe8c
GIT binary patch
literal 36864
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diff --git a/src/test/ssl/ssl/nss/server-cn-and-alt-names.crt__server-cn-and-alt-names.key.db/key4.db b/src/test/ssl/ssl/nss/server-cn-and-alt-names.crt__server-cn-and-alt-names.key.db/key4.db
new file mode 100644
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diff --git a/src/test/ssl/ssl/nss/server-cn-and-alt-names.crt__server-cn-and-alt-names.key.db/pkcs11.txt b/src/test/ssl/ssl/nss/server-cn-and-alt-names.crt__server-cn-and-alt-names.key.db/pkcs11.txt
new file mode 100644
index 0000000000..bdd10448f3
--- /dev/null
+++ b/src/test/ssl/ssl/nss/server-cn-and-alt-names.crt__server-cn-and-alt-names.key.db/pkcs11.txt
@@ -0,0 +1,5 @@
+library=
+name=NSS Internal PKCS #11 Module
+parameters=configdir='sql:ssl/nss/server-cn-and-alt-names.crt__server-cn-and-alt-names.key.db' certPrefix='' keyPrefix='' secmod='secmod.db' flags= updatedir='' updateCertPrefix='' updateKeyPrefix='' updateid='' updateTokenDescription='' 
+NSS=Flags=internal,critical trustOrder=75 cipherOrder=100 slotParams=(1={slotFlags=[ECC,RSA,DSA,DH,RC2,RC4,DES,RANDOM,SHA1,MD5,MD2,SSL,TLS,AES,Camellia,SEED,SHA256,SHA512] askpw=any timeout=30})
+
diff --git a/src/test/ssl/ssl/nss/server-cn-and-alt-names.pfx b/src/test/ssl/ssl/nss/server-cn-and-alt-names.pfx
new file mode 100644
index 0000000000000000000000000000000000000000..b75c8b1df5d958af6e508211fd2f29534fff4d21
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diff --git a/src/test/ssl/ssl/nss/server-cn-only.crt__server-cn-only.key.db/cert9.db b/src/test/ssl/ssl/nss/server-cn-only.crt__server-cn-only.key.db/cert9.db
new file mode 100644
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diff --git a/src/test/ssl/ssl/nss/server-cn-only.crt__server-cn-only.key.db/key4.db b/src/test/ssl/ssl/nss/server-cn-only.crt__server-cn-only.key.db/key4.db
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GIT binary patch
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diff --git a/src/test/ssl/ssl/nss/server-cn-only.crt__server-cn-only.key.db/pkcs11.txt b/src/test/ssl/ssl/nss/server-cn-only.crt__server-cn-only.key.db/pkcs11.txt
new file mode 100644
index 0000000000..1e4d3f5fef
--- /dev/null
+++ b/src/test/ssl/ssl/nss/server-cn-only.crt__server-cn-only.key.db/pkcs11.txt
@@ -0,0 +1,5 @@
+library=
+name=NSS Internal PKCS #11 Module
+parameters=configdir='sql:ssl/nss/server-cn-only.crt__server-cn-only.key.db' certPrefix='' keyPrefix='' secmod='secmod.db' flags= updatedir='' updateCertPrefix='' updateKeyPrefix='' updateid='' updateTokenDescription='' 
+NSS=Flags=internal,critical trustOrder=75 cipherOrder=100 slotParams=(1={slotFlags=[ECC,RSA,DSA,DH,RC2,RC4,DES,RANDOM,SHA1,MD5,MD2,SSL,TLS,AES,Camellia,SEED,SHA256,SHA512] askpw=any timeout=30})
+
diff --git a/src/test/ssl/ssl/nss/server-cn-only.crt__server-password.key.db/cert9.db b/src/test/ssl/ssl/nss/server-cn-only.crt__server-password.key.db/cert9.db
new file mode 100644
index 0000000000000000000000000000000000000000..b0f30f7506ed349ff8119b5029a8818cbb04b01e
GIT binary patch
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diff --git a/src/test/ssl/ssl/nss/server-cn-only.crt__server-password.key.db/key4.db b/src/test/ssl/ssl/nss/server-cn-only.crt__server-password.key.db/key4.db
new file mode 100644
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diff --git a/src/test/ssl/ssl/nss/server-cn-only.crt__server-password.key.db/pkcs11.txt b/src/test/ssl/ssl/nss/server-cn-only.crt__server-password.key.db/pkcs11.txt
new file mode 100644
index 0000000000..142748c1c9
--- /dev/null
+++ b/src/test/ssl/ssl/nss/server-cn-only.crt__server-password.key.db/pkcs11.txt
@@ -0,0 +1,5 @@
+library=
+name=NSS Internal PKCS #11 Module
+parameters=configdir='sql:ssl/nss/server-cn-only.crt__server-password.key.db' certPrefix='' keyPrefix='' secmod='secmod.db' flags= updatedir='' updateCertPrefix='' updateKeyPrefix='' updateid='' updateTokenDescription='' 
+NSS=Flags=internal,critical trustOrder=75 cipherOrder=100 slotParams=(1={slotFlags=[ECC,RSA,DSA,DH,RC2,RC4,DES,RANDOM,SHA1,MD5,MD2,SSL,TLS,AES,Camellia,SEED,SHA256,SHA512] askpw=any timeout=30})
+
diff --git a/src/test/ssl/ssl/nss/server-cn-only.pfx b/src/test/ssl/ssl/nss/server-cn-only.pfx
new file mode 100644
index 0000000000000000000000000000000000000000..ba5bdfaeda2e17f36e42fe551cce074910c12a62
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diff --git a/src/test/ssl/ssl/nss/server-multiple-alt-names.crt__server-multiple-alt-names.key.db/cert9.db b/src/test/ssl/ssl/nss/server-multiple-alt-names.crt__server-multiple-alt-names.key.db/cert9.db
new file mode 100644
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diff --git a/src/test/ssl/ssl/nss/server-multiple-alt-names.crt__server-multiple-alt-names.key.db/key4.db b/src/test/ssl/ssl/nss/server-multiple-alt-names.crt__server-multiple-alt-names.key.db/key4.db
new file mode 100644
index 0000000000000000000000000000000000000000..8907e03577f91c6303d4b523aa88a3d23eb6f48c
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diff --git a/src/test/ssl/ssl/nss/server-multiple-alt-names.crt__server-multiple-alt-names.key.db/pkcs11.txt b/src/test/ssl/ssl/nss/server-multiple-alt-names.crt__server-multiple-alt-names.key.db/pkcs11.txt
new file mode 100644
index 0000000000..1d08f78285
--- /dev/null
+++ b/src/test/ssl/ssl/nss/server-multiple-alt-names.crt__server-multiple-alt-names.key.db/pkcs11.txt
@@ -0,0 +1,5 @@
+library=
+name=NSS Internal PKCS #11 Module
+parameters=configdir='sql:ssl/nss/server-multiple-alt-names.crt__server-multiple-alt-names.key.db' certPrefix='' keyPrefix='' secmod='secmod.db' flags= updatedir='' updateCertPrefix='' updateKeyPrefix='' updateid='' updateTokenDescription='' 
+NSS=Flags=internal,critical trustOrder=75 cipherOrder=100 slotParams=(1={slotFlags=[ECC,RSA,DSA,DH,RC2,RC4,DES,RANDOM,SHA1,MD5,MD2,SSL,TLS,AES,Camellia,SEED,SHA256,SHA512] askpw=any timeout=30})
+
diff --git a/src/test/ssl/ssl/nss/server-multiple-alt-names.pfx b/src/test/ssl/ssl/nss/server-multiple-alt-names.pfx
new file mode 100644
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diff --git a/src/test/ssl/ssl/nss/server-no-names.crt__server-no-names.key.db/key4.db b/src/test/ssl/ssl/nss/server-no-names.crt__server-no-names.key.db/key4.db
new file mode 100644
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literal 0
HcmV?d00001

diff --git a/src/test/ssl/ssl/nss/server-no-names.crt__server-no-names.key.db/pkcs11.txt b/src/test/ssl/ssl/nss/server-no-names.crt__server-no-names.key.db/pkcs11.txt
new file mode 100644
index 0000000000..78691fd862
--- /dev/null
+++ b/src/test/ssl/ssl/nss/server-no-names.crt__server-no-names.key.db/pkcs11.txt
@@ -0,0 +1,5 @@
+library=
+name=NSS Internal PKCS #11 Module
+parameters=configdir='sql:ssl/nss/server-no-names.crt__server-no-names.key.db' certPrefix='' keyPrefix='' secmod='secmod.db' flags= updatedir='' updateCertPrefix='' updateKeyPrefix='' updateid='' updateTokenDescription='' 
+NSS=Flags=internal,critical trustOrder=75 cipherOrder=100 slotParams=(1={slotFlags=[ECC,RSA,DSA,DH,RC2,RC4,DES,RANDOM,SHA1,MD5,MD2,SSL,TLS,AES,Camellia,SEED,SHA256,SHA512] askpw=any timeout=30})
+
diff --git a/src/test/ssl/ssl/nss/server-no-names.pfx b/src/test/ssl/ssl/nss/server-no-names.pfx
new file mode 100644
index 0000000000000000000000000000000000000000..3db5c17f9c65ee8e38b435307569945f5230eef0
GIT binary patch
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diff --git a/src/test/ssl/ssl/nss/server-password.pfx b/src/test/ssl/ssl/nss/server-password.pfx
new file mode 100644
index 0000000000000000000000000000000000000000..973ffd13c772f74dc2fcdbed87274f78fdbbbffe
GIT binary patch
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literal 0
HcmV?d00001

diff --git a/src/test/ssl/ssl/nss/server-revoked.crt__server-revoked.key.db/cert9.db b/src/test/ssl/ssl/nss/server-revoked.crt__server-revoked.key.db/cert9.db
new file mode 100644
index 0000000000000000000000000000000000000000..f396d2216eddb9e8080c5f2a5398a0ad30a330d0
GIT binary patch
literal 36864
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diff --git a/src/test/ssl/ssl/nss/server-revoked.crt__server-revoked.key.db/key4.db b/src/test/ssl/ssl/nss/server-revoked.crt__server-revoked.key.db/key4.db
new file mode 100644
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diff --git a/src/test/ssl/ssl/nss/server-revoked.crt__server-revoked.key.db/pkcs11.txt b/src/test/ssl/ssl/nss/server-revoked.crt__server-revoked.key.db/pkcs11.txt
new file mode 100644
index 0000000000..c5e90c7000
--- /dev/null
+++ b/src/test/ssl/ssl/nss/server-revoked.crt__server-revoked.key.db/pkcs11.txt
@@ -0,0 +1,5 @@
+library=
+name=NSS Internal PKCS #11 Module
+parameters=configdir='sql:ssl/nss/server-revoked.crt__server-revoked.key.db' certPrefix='' keyPrefix='' secmod='secmod.db' flags= updatedir='' updateCertPrefix='' updateKeyPrefix='' updateid='' updateTokenDescription='' 
+NSS=Flags=internal,critical trustOrder=75 cipherOrder=100 slotParams=(1={slotFlags=[ECC,RSA,DSA,DH,RC2,RC4,DES,RANDOM,SHA1,MD5,MD2,SSL,TLS,AES,Camellia,SEED,SHA256,SHA512] askpw=any timeout=30})
+
diff --git a/src/test/ssl/ssl/nss/server-revoked.pfx b/src/test/ssl/ssl/nss/server-revoked.pfx
new file mode 100644
index 0000000000000000000000000000000000000000..52fd4217213867aa1dcdd8d0bbe428dbc54c7b7f
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diff --git a/src/test/ssl/ssl/nss/server-single-alt-name.crt__server-single-alt-name.key.db/cert9.db b/src/test/ssl/ssl/nss/server-single-alt-name.crt__server-single-alt-name.key.db/cert9.db
new file mode 100644
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diff --git a/src/test/ssl/ssl/nss/server-single-alt-name.crt__server-single-alt-name.key.db/key4.db b/src/test/ssl/ssl/nss/server-single-alt-name.crt__server-single-alt-name.key.db/key4.db
new file mode 100644
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diff --git a/src/test/ssl/ssl/nss/server-single-alt-name.crt__server-single-alt-name.key.db/pkcs11.txt b/src/test/ssl/ssl/nss/server-single-alt-name.crt__server-single-alt-name.key.db/pkcs11.txt
new file mode 100644
index 0000000000..82255d3f4e
--- /dev/null
+++ b/src/test/ssl/ssl/nss/server-single-alt-name.crt__server-single-alt-name.key.db/pkcs11.txt
@@ -0,0 +1,5 @@
+library=
+name=NSS Internal PKCS #11 Module
+parameters=configdir='sql:ssl/nss/server-single-alt-name.crt__server-single-alt-name.key.db' certPrefix='' keyPrefix='' secmod='secmod.db' flags= updatedir='' updateCertPrefix='' updateKeyPrefix='' updateid='' updateTokenDescription='' 
+NSS=Flags=internal,critical trustOrder=75 cipherOrder=100 slotParams=(1={slotFlags=[ECC,RSA,DSA,DH,RC2,RC4,DES,RANDOM,SHA1,MD5,MD2,SSL,TLS,AES,Camellia,SEED,SHA256,SHA512] askpw=any timeout=30})
+
diff --git a/src/test/ssl/ssl/nss/server-single-alt-name.pfx b/src/test/ssl/ssl/nss/server-single-alt-name.pfx
new file mode 100644
index 0000000000000000000000000000000000000000..3d0fee97935a0513dbaa0979b6754b885a6a7c71
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diff --git a/src/test/ssl/ssl/nss/server_ca.crt.db/cert9.db b/src/test/ssl/ssl/nss/server_ca.crt.db/cert9.db
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literal 0
HcmV?d00001

diff --git a/src/test/ssl/ssl/nss/server_ca.crt.db/key4.db b/src/test/ssl/ssl/nss/server_ca.crt.db/key4.db
new file mode 100644
index 0000000000000000000000000000000000000000..7724801ab7b783dee9780314a10c797f4b0bc203
GIT binary patch
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literal 0
HcmV?d00001

diff --git a/src/test/ssl/ssl/nss/server_ca.crt.db/pkcs11.txt b/src/test/ssl/ssl/nss/server_ca.crt.db/pkcs11.txt
new file mode 100644
index 0000000000..b81ced09e6
--- /dev/null
+++ b/src/test/ssl/ssl/nss/server_ca.crt.db/pkcs11.txt
@@ -0,0 +1,5 @@
+library=
+name=NSS Internal PKCS #11 Module
+parameters=configdir='sql:ssl/nss/server_ca.crt.db' certPrefix='' keyPrefix='' secmod='secmod.db' flags= updatedir='' updateCertPrefix='' updateKeyPrefix='' updateid='' updateTokenDescription='' 
+NSS=Flags=internal,critical trustOrder=75 cipherOrder=100 slotParams=(1={slotFlags=[ECC,RSA,DSA,DH,RC2,RC4,DES,RANDOM,SHA1,MD5,MD2,SSL,TLS,AES,Camellia,SEED,SHA256,SHA512] askpw=any timeout=30})
+
diff --git a/src/test/ssl/t/001_ssltests.pl b/src/test/ssl/t/001_ssltests.pl
index fd2727b568..00530d98af 100644
--- a/src/test/ssl/t/001_ssltests.pl
+++ b/src/test/ssl/t/001_ssltests.pl
@@ -4,15 +4,22 @@ use PostgresNode;
 use TestLib;
 use Test::More;
 
-use File::Copy;
-
 use FindBin;
 use lib $FindBin::RealBin;
 
-use SSLServer;
+use SSL::Server;
+
+my $openssl;
+my $nss;
 
 if ($ENV{with_openssl} eq 'yes')
 {
+	$openssl = 1;
+	plan tests => 93;
+}
+elsif ($ENV{with_nss} eq 'yes')
+{
+	$nss = 1;
 	plan tests => 93;
 }
 else
@@ -32,32 +39,6 @@ my $SERVERHOSTCIDR = '127.0.0.1/32';
 # Allocation of base connection string shared among multiple tests.
 my $common_connstr;
 
-# The client's private key must not be world-readable, so take a copy
-# of the key stored in the code tree and update its permissions.
-#
-# This changes ssl/client.key to ssl/client_tmp.key etc for the rest
-# of the tests.
-my @keys = (
-	"client",     "client-revoked",
-	"client-der", "client-encrypted-pem",
-	"client-encrypted-der");
-foreach my $key (@keys)
-{
-	copy("ssl/${key}.key", "ssl/${key}_tmp.key")
-	  or die
-	  "couldn't copy ssl/${key}.key to ssl/${key}_tmp.key for permissions change: $!";
-	chmod 0600, "ssl/${key}_tmp.key"
-	  or die "failed to change permissions on ssl/${key}_tmp.key: $!";
-}
-
-# Also make a copy of that explicitly world-readable.  We can't
-# necessarily rely on the file in the source tree having those
-# permissions.  Add it to @keys to include it in the final clean
-# up phase.
-copy("ssl/client.key", "ssl/client_wrongperms_tmp.key");
-chmod 0644, "ssl/client_wrongperms_tmp.key";
-push @keys, 'client_wrongperms';
-
 #### Set up the server.
 
 note "setting up data directory";
@@ -72,32 +53,28 @@ $node->start;
 
 # Run this before we lock down access below.
 my $result = $node->safe_psql('postgres', "SHOW ssl_library");
-is($result, 'OpenSSL', 'ssl_library parameter');
+is($result, SSL::Server::ssl_library(), 'ssl_library parameter');
 
 configure_test_server_for_ssl($node, $SERVERHOSTADDR, $SERVERHOSTCIDR,
 	'trust');
 
 note "testing password-protected keys";
 
-open my $sslconf, '>', $node->data_dir . "/sslconfig.conf";
-print $sslconf "ssl=on\n";
-print $sslconf "ssl_cert_file='server-cn-only.crt'\n";
-print $sslconf "ssl_key_file='server-password.key'\n";
-print $sslconf "ssl_passphrase_command='echo wrongpassword'\n";
-close $sslconf;
-
-command_fails(
-	[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
-	'restart fails with password-protected key file with wrong password');
-$node->_update_pid(0);
-
-open $sslconf, '>', $node->data_dir . "/sslconfig.conf";
-print $sslconf "ssl=on\n";
-print $sslconf "ssl_cert_file='server-cn-only.crt'\n";
-print $sslconf "ssl_key_file='server-password.key'\n";
-print $sslconf "ssl_passphrase_command='echo secret1'\n";
-close $sslconf;
+SKIP:
+{
+	skip "Certificate passphrases aren't checked on server restart in NSS", 1
+	  if ($nss);
+
+	set_server_cert($node, 'server-cn-only', 'root+client_ca',
+					   'server-password', 'echo wrongpassword');
+	command_fails(
+		[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
+		'restart fails with password-protected key file with wrong password');
+	$node->_update_pid(0);
+}
 
+set_server_cert($node, 'server-cn-only', 'root+client_ca',
+				'server-password', 'echo secret1');
 command_ok(
 	[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
 	'restart succeeds with password-protected key file');
@@ -149,82 +126,105 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"sslrootcert=invalid sslmode=verify-ca",
-	qr/root certificate file "invalid" does not exist/,
+	qr/root certificate file "invalid" does not exist|could not connect to server/,
 	"connect without server root cert sslmode=verify-ca");
 test_connect_fails(
 	$common_connstr,
 	"sslrootcert=invalid sslmode=verify-full",
-	qr/root certificate file "invalid" does not exist/,
+	qr/root certificate file "invalid" does not exist|could not connect to server/,
 	"connect without server root cert sslmode=verify-full");
 
 # Try with wrong root cert, should fail. (We're using the client CA as the
 # root, but the server's key is signed by the server CA.)
-test_connect_fails($common_connstr,
-	"sslrootcert=ssl/client_ca.crt sslmode=require",
-	qr/SSL error/, "connect with wrong server root cert sslmode=require");
-test_connect_fails($common_connstr,
-	"sslrootcert=ssl/client_ca.crt sslmode=verify-ca",
-	qr/SSL error/, "connect with wrong server root cert sslmode=verify-ca");
-test_connect_fails($common_connstr,
-	"sslrootcert=ssl/client_ca.crt sslmode=verify-full",
-	qr/SSL error/, "connect with wrong server root cert sslmode=verify-full");
-
-# Try with just the server CA's cert. This fails because the root file
-# must contain the whole chain up to the root CA.
-test_connect_fails($common_connstr,
-	"sslrootcert=ssl/server_ca.crt sslmode=verify-ca",
-	qr/SSL error/, "connect with server CA cert, without root CA");
+test_connect_fails(
+	$common_connstr,
+	"sslrootcert=ssl/client_ca.crt sslmode=require cert_database=ssl/nss/client_ca.crt.db",
+	qr/SSL error/,
+	"connect with wrong server root cert sslmode=require");
+test_connect_fails(
+	$common_connstr,
+	"sslrootcert=ssl/client_ca.crt sslmode=verify-ca cert_database=ssl/nss/client_ca.crt.db",
+	qr/SSL error/,
+	"connect with wrong server root cert sslmode=verify-ca");
+test_connect_fails(
+	$common_connstr,
+	"sslrootcert=ssl/client_ca.crt sslmode=verify-full cert_database=ssl/nss/client_ca.crt.db",
+	qr/SSL error/,
+	"connect with wrong server root cert sslmode=verify-full");
+
+SKIP:
+{
+	# NSS supports partial chain validation, so this test doesnt work there.
+	# This is similar to the OpenSSL option X509_V_FLAG_PARTIAL_CHAIN which
+	# we don't allow.
+	skip "NSS support partial chain validation", 2 if ($nss);
+	# Try with just the server CA's cert. This fails because the root file
+	# must contain the whole chain up to the root CA.
+	test_connect_fails($common_connstr,
+		"sslrootcert=ssl/server_ca.crt sslmode=verify-ca",
+		qr/SSL error/, "connect with server CA cert, without root CA");
+}
 
 # And finally, with the correct root cert.
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require cert_database=ssl/nss/root+server_ca.crt.db",
 	"connect with correct server CA cert file sslmode=require");
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca cert_database=ssl/nss/root+server_ca.crt.db",
 	"connect with correct server CA cert file sslmode=verify-ca");
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-full",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db",
 	"connect with correct server CA cert file sslmode=verify-full");
 
-# Test with cert root file that contains two certificates. The client should
-# be able to pick the right one, regardless of the order in the file.
-test_connect_ok(
-	$common_connstr,
-	"sslrootcert=ssl/both-cas-1.crt sslmode=verify-ca",
-	"cert root file that contains two certificates, order 1");
-test_connect_ok(
-	$common_connstr,
-	"sslrootcert=ssl/both-cas-2.crt sslmode=verify-ca",
-	"cert root file that contains two certificates, order 2");
+SKIP:
+{
+	skip "CA ordering is irrelevant in NSS databases", 2 if ($nss);
 
+	# Test with cert root file that contains two certificates. The client should
+	# be able to pick the right one, regardless of the order in the file.
+	test_connect_ok(
+		$common_connstr,
+		"sslrootcert=ssl/both-cas-1.crt sslmode=verify-ca",
+		"cert root file that contains two certificates, order 1");
+
+	# How about import the both-file into a database?
+	test_connect_ok(
+		$common_connstr,
+		"sslrootcert=ssl/both-cas-2.crt sslmode=verify-ca",
+		"cert root file that contains two certificates, order 2");
+}
 # CRL tests
 
 # Invalid CRL filename is the same as no CRL, succeeds
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=invalid",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=invalid cert_database=ssl/nss/root+server_ca.crt.db",
 	"sslcrl option with invalid file name");
 
-# A CRL belonging to a different CA is not accepted, fails
-test_connect_fails(
-	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/client.crl",
-	qr/SSL error/,
-	"CRL belonging to a different CA");
+SKIP:
+{
+	skip "CRL's are verified when adding to NSS database", 2 if ($nss);
+	# A CRL belonging to a different CA is not accepted, fails
+	test_connect_fails(
+		$common_connstr,
+		"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/client.crl",
+		qr/SSL error/,
+		"CRL belonging to a different CA");
+}
 
 # With the correct CRL, succeeds (this cert is not revoked)
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/root+server.crl",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/root+server.crl cert_database=ssl/nss/root+server_ca.crt__root+server.crl.db",
 	"CRL with a non-revoked cert");
 
 # Check that connecting with verify-full fails, when the hostname doesn't
 # match the hostname in the server's certificate.
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -237,14 +237,14 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"sslmode=verify-full host=wronghost.test",
-	qr/\Qserver certificate for "common-name.pg-ssltest.test" does not match host name "wronghost.test"\E/,
+	qr/\Qserver certificate for "common-name.pg-ssltest.test" does not match host name "wronghost.test"\E|SSL_ERROR_BAD_CERT_DOMAIN/,
 	"mismatch between host name and server certificate sslmode=verify-full");
 
 # Test Subject Alternative Names.
 switch_server_cert($node, 'server-multiple-alt-names');
 
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -262,12 +262,12 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"host=wronghost.alt-name.pg-ssltest.test",
-	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "wronghost.alt-name.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "wronghost.alt-name.pg-ssltest.test"\E|SSL_ERROR_BAD_CERT_DOMAIN/,
 	"host name not matching with X.509 Subject Alternative Names");
 test_connect_fails(
 	$common_connstr,
 	"host=deep.subdomain.wildcard.pg-ssltest.test",
-	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E|SSL_ERROR_BAD_CERT_DOMAIN/,
 	"host name not matching with X.509 Subject Alternative Names wildcard");
 
 # Test certificate with a single Subject Alternative Name. (this gives a
@@ -275,7 +275,7 @@ test_connect_fails(
 switch_server_cert($node, 'server-single-alt-name');
 
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -285,12 +285,12 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"host=wronghost.alt-name.pg-ssltest.test",
-	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "wronghost.alt-name.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "wronghost.alt-name.pg-ssltest.test"\E|SSL_ERROR_BAD_CERT_DOMAIN/,
 	"host name not matching with a single X.509 Subject Alternative Name");
 test_connect_fails(
 	$common_connstr,
 	"host=deep.subdomain.wildcard.pg-ssltest.test",
-	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E|SSL_ERROR_BAD_CERT_DOMAIN/,
 	"host name not matching with a single X.509 Subject Alternative Name wildcard"
 );
 
@@ -299,7 +299,7 @@ test_connect_fails(
 switch_server_cert($node, 'server-cn-and-alt-names');
 
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -312,14 +312,14 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"host=common-name.pg-ssltest.test",
-	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 1 other name) does not match host name "common-name.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 1 other name) does not match host name "common-name.pg-ssltest.test"\E|SSL_ERROR_BAD_CERT_DOMAIN/,
 	"certificate with both a CN and SANs ignores CN");
 
 # Finally, test a server certificate that has no CN or SANs. Of course, that's
 # not a very sensible certificate, but libpq should handle it gracefully.
 switch_server_cert($node, 'server-no-names');
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -328,7 +328,7 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"sslmode=verify-full host=common-name.pg-ssltest.test",
-	qr/could not get server's host name from server certificate/,
+	qr/could not get server's host name from server certificate|SSL_ERROR_BAD_CERT_DOMAIN/,
 	"server certificate without CN or SANs sslmode=verify-full");
 
 # Test that the CRL works
@@ -340,11 +340,11 @@ $common_connstr =
 # Without the CRL, succeeds. With it, fails.
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca cert_database=ssl/nss/root+server_ca.crt.db",
 	"connects without client-side CRL");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/root+server.crl",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/server.crl cert_database=ssl/nss/root+server_ca.crt__server.crl.db",
 	qr/SSL error/,
 	"does not connect with client-side CRL");
 
@@ -365,21 +365,21 @@ command_like(
 # Test min/max SSL protocol versions.
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.2",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.2 cert_database=ssl/nss/root+server_ca.crt.db",
 	"connection success with correct range of TLS protocol versions");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.1",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.1 cert_database=ssl/nss/root+server_ca.crt.db",
 	qr/invalid SSL protocol version range/,
 	"connection failure with incorrect range of TLS protocol versions");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=incorrect_tls",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=incorrect_tls cert_database=ssl/nss/root+server_ca.crt.db",
 	qr/invalid ssl_min_protocol_version value/,
 	"connection failure with an incorrect SSL protocol minimum bound");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_max_protocol_version=incorrect_tls",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_max_protocol_version=incorrect_tls cert_database=ssl/nss/root+server_ca.crt.db",
 	qr/invalid ssl_max_protocol_version value/,
 	"connection failure with an incorrect SSL protocol maximum bound");
 
@@ -390,7 +390,7 @@ test_connect_fails(
 note "running server tests";
 
 $common_connstr =
-  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR";
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client.crt__client.key.db";
 
 # no client cert
 test_connect_fails(
@@ -406,32 +406,43 @@ test_connect_ok(
 	"certificate authorization succeeds with correct client cert in PEM format"
 );
 
-# correct client cert in unencrypted DER
-test_connect_ok(
-	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-der_tmp.key",
-	"certificate authorization succeeds with correct client cert in DER format"
-);
+$common_connstr =
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR";
+
+SKIP:
+{
+	skip "NSS database not implemented in the Makefile", 1 if ($nss);
+	# correct client cert in unencrypted DER
+	test_connect_ok(
+		$common_connstr,
+		"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-der_tmp.key",
+		"certificate authorization succeeds with correct client cert in DER format"
+	);
+}
 
 # correct client cert in encrypted PEM
 test_connect_ok(
 	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='dUmmyP^#+'",
+	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='dUmmyP^#+' cert_database=ssl/nss/client.crt__client-encrypted-pem.key.db",
 	"certificate authorization succeeds with correct client cert in encrypted PEM format"
 );
 
-# correct client cert in encrypted DER
-test_connect_ok(
-	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-der_tmp.key sslpassword='dUmmyP^#+'",
-	"certificate authorization succeeds with correct client cert in encrypted DER format"
-);
+SKIP:
+{
+	skip "NSS database not implemented in the Makefile", 1 if ($nss);
+	# correct client cert in encrypted DER
+	test_connect_ok(
+		$common_connstr,
+		"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-der_tmp.key sslpassword='dUmmyP^#+'",
+		"certificate authorization succeeds with correct client cert in encrypted DER format"
+	);
+}
 
 # correct client cert in encrypted PEM with wrong password
 test_connect_fails(
 	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='wrong'",
-	qr!\Qprivate key file "ssl/client-encrypted-pem_tmp.key": bad decrypt\E!,
+	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='wrong' cert_database=ssl/nss/client.crt__client-encrypted-pem.key.db",
+	qr!connection requires a valid client certificate|\Qprivate key file "ssl/client-encrypted-pem_tmp.key": bad decrypt\E!,
 	"certificate authorization fails with correct client cert and wrong password in encrypted PEM format"
 );
 
@@ -471,18 +482,19 @@ command_like(
 		'-P',
 		'null=_null_',
 		'-d',
-		"$common_connstr user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client_tmp.key",
+		"$common_connstr user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client_tmp.key cert_database=ssl/nss/client.crt__client.key.db",
 		'-c',
 		"SELECT * FROM pg_stat_ssl WHERE pid = pg_backend_pid()"
 	],
 	qr{^pid,ssl,version,cipher,bits,compression,client_dn,client_serial,issuer_dn\r?\n
-				^\d+,t,TLSv[\d.]+,[\w-]+,\d+,f,/CN=ssltestuser,1,\Q/CN=Test CA for PostgreSQL SSL regression test client certs\E\r?$}mx,
+				^\d+,t,TLSv[\d.]+,[\w-]+,\d+,f,/?CN=ssltestuser,1,/?\QCN=Test CA for PostgreSQL SSL regression test client certs\E\r?$}mx,
 	'pg_stat_ssl with client certificate');
 
 # client key with wrong permissions
 SKIP:
 {
 	skip "Permissions check not enforced on Windows", 2 if ($windows_os);
+	skip "Key not on filesystem with NSS",            2 if ($nss);
 
 	test_connect_fails(
 		$common_connstr,
@@ -495,10 +507,13 @@ SKIP:
 test_connect_fails(
 	$common_connstr,
 	"user=anotheruser sslcert=ssl/client.crt sslkey=ssl/client_tmp.key",
-	qr/certificate authentication failed for user "anotheruser"/,
+	qr/unable to verify certificate|certificate authentication failed for user "anotheruser"/,
 	"certificate authorization fails with client cert belonging to another user"
 );
 
+$common_connstr =
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client-revoked.crt__client-revoked.key.db";
+
 # revoked client cert
 test_connect_fails(
 	$common_connstr,
@@ -510,7 +525,7 @@ test_connect_fails(
 # works, iff username matches Common Name
 # fails, iff username doesn't match Common Name.
 $common_connstr =
-  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=verifydb hostaddr=$SERVERHOSTADDR";
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=verifydb hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client.crt__client.key.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -536,17 +551,23 @@ test_connect_ok(
 # intermediate client_ca.crt is provided by client, and isn't in server's ssl_ca_file
 switch_server_cert($node, 'server-cn-only', 'root_ca');
 $common_connstr =
-  "user=ssltestuser dbname=certdb sslkey=ssl/client_tmp.key sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR";
+  "user=ssltestuser dbname=certdb sslkey=ssl/client_tmp.key sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client+client_ca.crt__client.key.db";
 
-test_connect_ok(
+TODO:
+{
+	local $TODO = "WIP failure cause currently unknown";
+	test_connect_ok(
+		$common_connstr,
+		"sslmode=require sslcert=ssl/client+client_ca.crt",
+		"intermediate client certificate is provided by client");
+}
+
+test_connect_fails(
 	$common_connstr,
-	"sslmode=require sslcert=ssl/client+client_ca.crt",
-	"intermediate client certificate is provided by client");
-test_connect_fails($common_connstr, "sslmode=require sslcert=ssl/client.crt",
-	qr/SSL error/, "intermediate client certificate is missing");
+	"sslmode=require sslcert=ssl/client.crt",
+	qr/connection requires a valid client certificate|SSL error/,
+	"intermediate client certificate is missing");
 
 # clean up
-foreach my $key (@keys)
-{
-	unlink("ssl/${key}_tmp.key");
-}
+
+SSL::Server::cleanup();
diff --git a/src/test/ssl/t/002_scram.pl b/src/test/ssl/t/002_scram.pl
index 20ab0d5b0b..b50659e568 100644
--- a/src/test/ssl/t/002_scram.pl
+++ b/src/test/ssl/t/002_scram.pl
@@ -11,11 +11,11 @@ use File::Copy;
 use FindBin;
 use lib $FindBin::RealBin;
 
-use SSLServer;
+use SSL::Server;
 
 if ($ENV{with_openssl} ne 'yes')
 {
-	plan skip_all => 'SSL not supported by this build';
+	plan skip_all => 'OpenSSL not supported by this build';
 }
 
 # This is the hostname used to connect to the server.
diff --git a/src/test/ssl/t/SSL/Backend/NSS.pm b/src/test/ssl/t/SSL/Backend/NSS.pm
new file mode 100644
index 0000000000..837f0d9891
--- /dev/null
+++ b/src/test/ssl/t/SSL/Backend/NSS.pm
@@ -0,0 +1,64 @@
+package SSL::Backend::NSS;
+
+use strict;
+use warnings;
+use Exporter;
+
+our @ISA       = qw(Exporter);
+our @EXPORT_OK = qw(get_new_nss_backend);
+
+sub new
+{
+	my ($class) = @_;
+
+	my $self = { _library => 'NSS' };
+
+	bless $self, $class;
+
+	return $self;
+}
+
+sub get_new_nss_backend
+{
+	my $class = 'SSL::Backend::NSS';
+
+	return $class->new();
+}
+
+sub init
+{
+	# Make sure the certificate databases are in place?
+}
+
+sub get_library
+{
+	my ($self) = @_;
+
+	return $self->{_library};
+}
+
+sub set_server_cert
+{
+	my $self     = $_[0];
+	my $certfile = $_[1];
+	my $cafile   = $_[2];
+	my $keyfile  = $_[3];
+
+	my $cert_nickname = $certfile . '.crt__' . $keyfile . '.key';
+	my $cert_database = $cert_nickname . '.db';
+
+	my $sslconf =
+	    "ssl_ca_file='$cafile.crt'\n"
+	  . "ssl_cert_file='ssl/$certfile.crt'\n"
+	  . "ssl_crl_file=''\n"
+	  . "ssl_database='nss/$cert_database'\n";
+
+	return $sslconf;
+}
+
+sub cleanup
+{
+	# Something?
+}
+
+1;
diff --git a/src/test/ssl/t/SSL/Backend/OpenSSL.pm b/src/test/ssl/t/SSL/Backend/OpenSSL.pm
new file mode 100644
index 0000000000..62b11b7632
--- /dev/null
+++ b/src/test/ssl/t/SSL/Backend/OpenSSL.pm
@@ -0,0 +1,103 @@
+package SSL::Backend::OpenSSL;
+
+use strict;
+use warnings;
+use Exporter;
+use File::Copy;
+
+our @ISA       = qw(Exporter);
+our @EXPORT_OK = qw(get_new_openssl_backend);
+
+our (@keys);
+
+INIT
+{
+	@keys = (
+		"client",     "client-revoked",
+		"client-der", "client-encrypted-pem",
+		"client-encrypted-der");
+}
+
+sub new
+{
+	my ($class) = @_;
+
+	my $self = { _library => 'OpenSSL' };
+
+	bless $self, $class;
+
+	return $self;
+}
+
+sub get_new_openssl_backend
+{
+	my $class = 'SSL::Backend::OpenSSL';
+
+	my $backend = $class->new();
+
+	return $backend;
+}
+
+sub init
+{
+	# The client's private key must not be world-readable, so take a copy
+	# of the key stored in the code tree and update its permissions.
+	#
+	# This changes ssl/client.key to ssl/client_tmp.key etc for the rest
+	# of the tests.
+	foreach my $key (@keys)
+	{
+		copy("ssl/${key}.key", "ssl/${key}_tmp.key")
+		  or die
+		  "couldn't copy ssl/${key}.key to ssl/${key}_tmp.key for permissions change: $!";
+		chmod 0600, "ssl/${key}_tmp.key"
+		  or die "failed to change permissions on ssl/${key}_tmp.key: $!";
+	}
+
+	# Also make a copy of that explicitly world-readable.  We can't
+	# necessarily rely on the file in the source tree having those
+	# permissions. Add it to @keys to include it in the final clean
+	# up phase.
+	copy("ssl/client.key", "ssl/client_wrongperms_tmp.key")
+	  or die
+	  "couldn't copy ssl/client.key to ssl/client_wrongperms_tmp.key: $!";
+	chmod 0644, "ssl/client_wrongperms_tmp.key"
+	  or die
+	  "failed to change permissions on ssl/client_wrongperms_tmp.key: $!";
+	push @keys, 'client_wrongperms';
+}
+
+# Change the configuration to use given server cert file, and reload
+# the server so that the configuration takes effect.
+sub set_server_cert
+{
+	my $self     = $_[0];
+	my $certfile = $_[1];
+	my $cafile   = $_[2] || "root+client_ca";
+	my $keyfile  = $_[3] || $certfile;
+
+	my $sslconf =
+	    "ssl_ca_file='$cafile.crt'\n"
+	  . "ssl_cert_file='$certfile.crt'\n"
+	  . "ssl_key_file='$keyfile.key'\n"
+	  . "ssl_crl_file='root+client.crl'\n";
+
+	return $sslconf;
+}
+
+sub get_library
+{
+	my ($self) = @_;
+
+	return $self->{_library};
+}
+
+sub cleanup
+{
+	foreach my $key (@keys)
+	{
+		unlink("ssl/${key}_tmp.key");
+	}
+}
+
+1;
diff --git a/src/test/ssl/t/SSLServer.pm b/src/test/ssl/t/SSL/Server.pm
similarity index 78%
rename from src/test/ssl/t/SSLServer.pm
rename to src/test/ssl/t/SSL/Server.pm
index f5987a003e..1261d21861 100644
--- a/src/test/ssl/t/SSLServer.pm
+++ b/src/test/ssl/t/SSL/Server.pm
@@ -23,19 +23,39 @@
 # explicitly because an invalid sslcert or sslrootcert, respectively,
 # causes those to be ignored.)
 
-package SSLServer;
+package SSL::Server;
 
 use strict;
 use warnings;
 use PostgresNode;
+use RecursiveCopy;
 use TestLib;
 use File::Basename;
 use File::Copy;
 use Test::More;
+use SSL::Backend::OpenSSL qw(get_new_openssl_backend);
+use SSL::Backend::NSS qw(get_new_nss_backend);
+
+our ($openssl, $nss, $backend);
+
+# The TLS backend which the server is using should be mostly transparent for
+# the user, apart from individual configuration settings, so keep the backend
+# specific things abstracted behind SSL::Server.
+if ($ENV{with_openssl} eq 'yes')
+{
+	$backend = get_new_openssl_backend();
+	$openssl = 1;
+}
+elsif ($ENV{with_nss} eq 'yes')
+{
+	$backend = get_new_nss_backend();
+	$nss     = 1;
+}
 
 use Exporter 'import';
 our @EXPORT = qw(
   configure_test_server_for_ssl
+  set_server_cert
   switch_server_cert
   test_connect_fails
   test_connect_ok
@@ -144,12 +164,19 @@ sub configure_test_server_for_ssl
 	close $sslconf;
 
 	# Copy all server certificates and keys, and client root cert, to the data dir
-	copy_files("ssl/server-*.crt", $pgdata);
-	copy_files("ssl/server-*.key", $pgdata);
-	chmod(0600, glob "$pgdata/server-*.key") or die $!;
-	copy_files("ssl/root+client_ca.crt", $pgdata);
-	copy_files("ssl/root_ca.crt",        $pgdata);
-	copy_files("ssl/root+client.crl",    $pgdata);
+	if (defined($openssl))
+	{
+		copy_files("ssl/server-*.crt", $pgdata);
+		copy_files("ssl/server-*.key", $pgdata);
+		chmod(0600, glob "$pgdata/server-*.key") or die $!;
+		copy_files("ssl/root+client_ca.crt", $pgdata);
+		copy_files("ssl/root_ca.crt",        $pgdata);
+		copy_files("ssl/root+client.crl",    $pgdata);
+	}
+	elsif (defined($nss))
+	{
+		RecursiveCopy::copypath("ssl/nss", $pgdata . "/nss") if -e "ssl/nss";
+	}
 
 	# Stop and restart server to load new listen_addresses.
 	$node->restart;
@@ -157,26 +184,51 @@ sub configure_test_server_for_ssl
 	# Change pg_hba after restart because hostssl requires ssl=on
 	configure_hba_for_ssl($node, $servercidr, $authmethod);
 
+	# Finally, perform backend specific configuration
+	$backend->init();
+
 	return;
 }
 
-# Change the configuration to use given server cert file, and reload
-# the server so that the configuration takes effect.
-sub switch_server_cert
+sub ssl_library
+{
+	return $backend->get_library();
+}
+
+sub cleanup
+{
+	$backend->cleanup();
+}
+
+# Change the configuration to use given server cert file,
+sub set_server_cert
 {
 	my $node     = $_[0];
 	my $certfile = $_[1];
 	my $cafile   = $_[2] || "root+client_ca";
+	my $keyfile  = $_[3] || '';
+	my $pwcmd    = $_[4] || '';
 	my $pgdata   = $node->data_dir;
 
+	$keyfile = $certfile if $keyfile eq '';
+
 	open my $sslconf, '>', "$pgdata/sslconfig.conf";
 	print $sslconf "ssl=on\n";
-	print $sslconf "ssl_ca_file='$cafile.crt'\n";
-	print $sslconf "ssl_cert_file='$certfile.crt'\n";
-	print $sslconf "ssl_key_file='$certfile.key'\n";
-	print $sslconf "ssl_crl_file='root+client.crl'\n";
+	print $sslconf $backend->set_server_cert($certfile, $cafile, $keyfile);
+	print $sslconf "ssl_passphrase_command='$pwcmd'\n"
+	  unless $pwcmd eq '';
 	close $sslconf;
+	return;
+}
 
+# Change the configuration to use given server cert file, and reload
+# the server so that the configuration takes effect.
+# Takes the same arguments as set_server_cert, which it calls to do that
+# piece of the work.
+sub switch_server_cert
+{
+	my $node = $_[0];
+	set_server_cert(@_);
 	$node->restart;
 	return;
 }
diff --git a/src/tools/msvc/Install.pm b/src/tools/msvc/Install.pm
index b6d0cfd39b..c53c59229e 100644
--- a/src/tools/msvc/Install.pm
+++ b/src/tools/msvc/Install.pm
@@ -438,7 +438,8 @@ sub CopyContribFiles
 		{
 			# These configuration-based exclusions must match vcregress.pl
 			next if ($d eq "uuid-ossp"  && !defined($config->{uuid}));
-			next if ($d eq "sslinfo"    && !defined($config->{openssl}));
+			next if ($d eq "sslinfo"    && !defined($config->{openssl})
+			  && !defined($config->{nss}));
 			next if ($d eq "xml2"       && !defined($config->{xml}));
 			next if ($d =~ /_plperl$/   && !defined($config->{perl}));
 			next if ($d =~ /_plpython$/ && !defined($config->{python}));
diff --git a/src/tools/msvc/Mkvcbuild.pm b/src/tools/msvc/Mkvcbuild.pm
index 20da7985c1..818a1922f3 100644
--- a/src/tools/msvc/Mkvcbuild.pm
+++ b/src/tools/msvc/Mkvcbuild.pm
@@ -192,12 +192,19 @@ sub mkvcbuild
 	$postgres->FullExportDLL('postgres.lib');
 
 	# The OBJS scraper doesn't know about ifdefs, so remove appropriate files
-	# if building without OpenSSL.
-	if (!$solution->{options}->{openssl})
+	# if building without various options.
+	if (!$solution->{options}->{openssl} && !$solution->{options}->{nss})
 	{
 		$postgres->RemoveFile('src/backend/libpq/be-secure-common.c');
+	}
+	if (!$solution->{options}->{openssl})
+	{
 		$postgres->RemoveFile('src/backend/libpq/be-secure-openssl.c');
 	}
+	if (!$solution->{options}->{nss})
+	{
+		$postgres->RemoveFile('src/backend/libpq/be-secure-nss.c');
+	}
 	if (!$solution->{options}->{gss})
 	{
 		$postgres->RemoveFile('src/backend/libpq/be-gssapi-common.c');
@@ -255,12 +262,19 @@ sub mkvcbuild
 	$libpq->AddReference($libpgcommon, $libpgport);
 
 	# The OBJS scraper doesn't know about ifdefs, so remove appropriate files
-	# if building without OpenSSL.
-	if (!$solution->{options}->{openssl})
+	# if building without various options
+	if (!$solution->{options}->{openssl} && !$solution->{options}->{nss})
 	{
 		$libpq->RemoveFile('src/interfaces/libpq/fe-secure-common.c');
+	}
+	if (!$solution->{options}->{openssl})
+	{
 		$libpq->RemoveFile('src/interfaces/libpq/fe-secure-openssl.c');
 	}
+	if (!$solution->{options}->{nss})
+	{
+		$libpq->RemoveFile('src/interfaces/libpq/fe-secure-nss.c');
+	}
 	if (!$solution->{options}->{gss})
 	{
 		$libpq->RemoveFile('src/interfaces/libpq/fe-gssapi-common.c');
@@ -428,9 +442,14 @@ sub mkvcbuild
 		push @contrib_excludes, 'xml2';
 	}
 
+	if (!$solution->{options}->{openssl} && !$solution->{options}->{nss})
+	{
+		push @contrib_excludes, 'sslinfo';
+	}
+
 	if (!$solution->{options}->{openssl})
 	{
-		push @contrib_excludes, 'sslinfo', 'ssl_passphrase_callback';
+		push @contrib_excludes, 'ssl_passphrase_callback';
 	}
 
 	if (!$solution->{options}->{uuid})
diff --git a/src/tools/msvc/Solution.pm b/src/tools/msvc/Solution.pm
index bc8904732f..ac11d9ab26 100644
--- a/src/tools/msvc/Solution.pm
+++ b/src/tools/msvc/Solution.pm
@@ -484,6 +484,7 @@ sub GenerateFiles
 		USE_NAMED_POSIX_SEMAPHORES => undef,
 		USE_OPENSSL                => undef,
 		USE_OPENSSL_RANDOM         => undef,
+		USE_NSS                    => undef,
 		USE_PAM                    => undef,
 		USE_SLICING_BY_8_CRC32C    => undef,
 		USE_SSE42_CRC32C           => undef,
@@ -537,6 +538,10 @@ sub GenerateFiles
 			$define{HAVE_OPENSSL_INIT_SSL}      = 1;
 		}
 	}
+	if ($self->{options}->{nss})
+	{
+		$define{USE_NSS} = 1;
+	}
 
 	$self->GenerateConfigHeader('src/include/pg_config.h',     \%define, 1);
 	$self->GenerateConfigHeader('src/include/pg_config_ext.h', \%define, 0);
@@ -1004,6 +1009,21 @@ sub AddProject
 			}
 		}
 	}
+	if ($self->{options}->{nss})
+	{
+		$proj->AddIncludeDir($self->{options}->{nss} . '\..\public\nss');
+		$proj->AddIncludeDir($self->{options}->{nss} . '\include\nspr');
+		foreach my $lib (qw(plds4 plc4 nspr4))
+		{
+			$proj->AddLibrary($self->{options}->{nss} .
+							  '\lib\lib' . "$lib.lib", 0);
+		}
+		foreach my $lib (qw(ssl3 smime3 nss3))
+		{
+			$proj->AddLibrary($self->{options}->{nss} .
+							  '\lib' . "\\$lib.dll.lib", 0);
+		}
+	}
 	if ($self->{options}->{nls})
 	{
 		$proj->AddIncludeDir($self->{options}->{nls} . '\include');
diff --git a/src/tools/msvc/config_default.pl b/src/tools/msvc/config_default.pl
index 2ef2cfc4e9..49dc4d5864 100644
--- a/src/tools/msvc/config_default.pl
+++ b/src/tools/msvc/config_default.pl
@@ -17,6 +17,7 @@ our $config = {
 	perl      => undef,    # --with-perl=<path>
 	python    => undef,    # --with-python=<path>
 	openssl   => undef,    # --with-openssl=<path>
+	nss       => undef,    # --with-nss=<path>
 	uuid      => undef,    # --with-uuid=<path>
 	xml       => undef,    # --with-libxml=<path>
 	xslt      => undef,    # --with-libxslt=<path>
-- 
2.21.1 (Apple Git-122.3)

From b397b75d49db00ef58e0cc4a3a456aa7d68d06fb Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Sat, 29 Aug 2020 01:24:10 +0200
Subject: [PATCH] Support for NSS as a TLS backend v10

Daniel Gustafsson, Andrew Dunstan
---
 configure                                     |  211 ++++
 configure.ac                                  |   30 +
 contrib/Makefile                              |    2 +-
 .../postgres_fdw/expected/postgres_fdw.out    |    2 +-
 contrib/sslinfo/sslinfo.c                     |  164 ++-
 doc/src/sgml/acronyms.sgml                    |   43 +
 doc/src/sgml/config.sgml                      |   21 +-
 doc/src/sgml/installation.sgml                |   30 +-
 doc/src/sgml/libpq.sgml                       |   25 +-
 doc/src/sgml/runtime.sgml                     |   78 +-
 doc/src/sgml/sslinfo.sgml                     |   14 +-
 src/Makefile.global.in                        |   10 +
 src/backend/libpq/Makefile                    |    4 +
 src/backend/libpq/auth.c                      |    7 +
 src/backend/libpq/be-secure-nss.c             | 1038 +++++++++++++++++
 src/backend/libpq/be-secure-openssl.c         |   16 +-
 src/backend/libpq/be-secure.c                 |    3 +
 src/backend/utils/misc/guc.c                  |   20 +-
 src/include/common/pg_nss.h                   |  141 +++
 src/include/libpq/libpq-be.h                  |    9 +-
 src/include/libpq/libpq.h                     |    3 +
 src/include/pg_config.h.in                    |    3 +
 src/include/pg_config_manual.h                |    5 +-
 src/interfaces/libpq/Makefile                 |    4 +
 src/interfaces/libpq/fe-connect.c             |    4 +
 src/interfaces/libpq/fe-secure-nss.c          |  984 ++++++++++++++++
 src/interfaces/libpq/fe-secure.c              |    5 +-
 src/interfaces/libpq/libpq-fe.h               |   11 +
 src/interfaces/libpq/libpq-int.h              |    5 +
 src/test/Makefile                             |    2 +-
 src/test/ssl/Makefile                         |  172 +++
 .../cert9.db                                  |  Bin 0 -> 36864 bytes
 .../key4.db                                   |  Bin 0 -> 36864 bytes
 .../pkcs11.txt                                |    5 +
 src/test/ssl/ssl/nss/client-encrypted-pem.pfx |  Bin 0 -> 3149 bytes
 .../cert9.db                                  |  Bin 0 -> 28672 bytes
 .../key4.db                                   |  Bin 0 -> 36864 bytes
 .../pkcs11.txt                                |    5 +
 src/test/ssl/ssl/nss/client-revoked.pfx       |  Bin 0 -> 3149 bytes
 src/test/ssl/ssl/nss/client.crl               |  Bin 0 -> 418 bytes
 ...ient.crt__client-encrypted-pem.key.db.pass |    1 +
 .../cert9.db                                  |  Bin 0 -> 36864 bytes
 .../key4.db                                   |  Bin 0 -> 45056 bytes
 .../pkcs11.txt                                |    5 +
 .../nss/client.crt__client.key.db/cert9.db    |  Bin 0 -> 36864 bytes
 .../ssl/nss/client.crt__client.key.db/key4.db |  Bin 0 -> 45056 bytes
 .../nss/client.crt__client.key.db/pkcs11.txt  |    5 +
 src/test/ssl/ssl/nss/client.pfx               |  Bin 0 -> 3149 bytes
 .../ssl/ssl/nss/client_ca.crt.db/cert9.db     |  Bin 0 -> 28672 bytes
 src/test/ssl/ssl/nss/client_ca.crt.db/key4.db |  Bin 0 -> 36864 bytes
 .../ssl/ssl/nss/client_ca.crt.db/pkcs11.txt   |    5 +
 src/test/ssl/ssl/nss/root+client.crl          |  Bin 0 -> 393 bytes
 .../ssl/nss/root+client_ca.crt.db/cert9.db    |  Bin 0 -> 28672 bytes
 .../ssl/ssl/nss/root+client_ca.crt.db/key4.db |  Bin 0 -> 36864 bytes
 .../ssl/nss/root+client_ca.crt.db/pkcs11.txt  |    5 +
 .../ssl/nss/root+server_ca.crt.db/cert9.db    |  Bin 0 -> 28672 bytes
 .../ssl/ssl/nss/root+server_ca.crt.db/key4.db |  Bin 0 -> 36864 bytes
 .../ssl/nss/root+server_ca.crt.db/pkcs11.txt  |    5 +
 .../cert9.db                                  |  Bin 0 -> 28672 bytes
 .../key4.db                                   |  Bin 0 -> 36864 bytes
 .../pkcs11.txt                                |    5 +
 .../cert9.db                                  |  Bin 0 -> 28672 bytes
 .../root+server_ca.crt__server.crl.db/key4.db |  Bin 0 -> 36864 bytes
 .../pkcs11.txt                                |    5 +
 src/test/ssl/ssl/nss/root.crl                 |  Bin 0 -> 393 bytes
 .../cert9.db                                  |  Bin 0 -> 36864 bytes
 .../key4.db                                   |  Bin 0 -> 45056 bytes
 .../pkcs11.txt                                |    5 +
 .../ssl/ssl/nss/server-cn-and-alt-names.pfx   |  Bin 0 -> 3349 bytes
 .../cert9.db                                  |  Bin 0 -> 28672 bytes
 .../key4.db                                   |  Bin 0 -> 36864 bytes
 .../pkcs11.txt                                |    5 +
 .../cert9.db                                  |  Bin 0 -> 36864 bytes
 .../key4.db                                   |  Bin 0 -> 45056 bytes
 .../pkcs11.txt                                |    5 +
 src/test/ssl/ssl/nss/server-cn-only.pfx       |  Bin 0 -> 3197 bytes
 .../cert9.db                                  |  Bin 0 -> 36864 bytes
 .../key4.db                                   |  Bin 0 -> 45056 bytes
 .../pkcs11.txt                                |    5 +
 .../ssl/ssl/nss/server-multiple-alt-names.pfx |  Bin 0 -> 3325 bytes
 .../cert9.db                                  |  Bin 0 -> 36864 bytes
 .../key4.db                                   |  Bin 0 -> 45056 bytes
 .../pkcs11.txt                                |    5 +
 src/test/ssl/ssl/nss/server-no-names.pfx      |  Bin 0 -> 3109 bytes
 src/test/ssl/ssl/nss/server-password.pfx      |  Bin 0 -> 3197 bytes
 .../cert9.db                                  |  Bin 0 -> 36864 bytes
 .../key4.db                                   |  Bin 0 -> 45056 bytes
 .../pkcs11.txt                                |    5 +
 src/test/ssl/ssl/nss/server-revoked.pfx       |  Bin 0 -> 3181 bytes
 .../cert9.db                                  |  Bin 0 -> 36864 bytes
 .../key4.db                                   |  Bin 0 -> 45056 bytes
 .../pkcs11.txt                                |    5 +
 .../ssl/ssl/nss/server-single-alt-name.pfx    |  Bin 0 -> 3213 bytes
 src/test/ssl/ssl/nss/server.crl               |  Bin 0 -> 418 bytes
 .../ssl/ssl/nss/server_ca.crt.db/cert9.db     |  Bin 0 -> 28672 bytes
 src/test/ssl/ssl/nss/server_ca.crt.db/key4.db |  Bin 0 -> 36864 bytes
 .../ssl/ssl/nss/server_ca.crt.db/pkcs11.txt   |    5 +
 src/test/ssl/t/001_ssltests.pl                |  289 ++---
 src/test/ssl/t/002_scram.pl                   |    4 +-
 src/test/ssl/t/SSL/Backend/NSS.pm             |   64 +
 src/test/ssl/t/SSL/Backend/OpenSSL.pm         |  103 ++
 .../ssl/t/{SSLServer.pm => SSL/Server.pm}     |   80 +-
 src/tools/msvc/Install.pm                     |    3 +-
 src/tools/msvc/Mkvcbuild.pm                   |   29 +-
 src/tools/msvc/Solution.pm                    |   20 +
 src/tools/msvc/config_default.pl              |    1 +
 106 files changed, 3479 insertions(+), 266 deletions(-)
 create mode 100644 src/backend/libpq/be-secure-nss.c
 create mode 100644 src/include/common/pg_nss.h
 create mode 100644 src/interfaces/libpq/fe-secure-nss.c
 create mode 100644 src/test/ssl/ssl/nss/client+client_ca.crt__client.key.db/cert9.db
 create mode 100644 src/test/ssl/ssl/nss/client+client_ca.crt__client.key.db/key4.db
 create mode 100644 src/test/ssl/ssl/nss/client+client_ca.crt__client.key.db/pkcs11.txt
 create mode 100644 src/test/ssl/ssl/nss/client-encrypted-pem.pfx
 create mode 100644 src/test/ssl/ssl/nss/client-revoked.crt__client-revoked.key.db/cert9.db
 create mode 100644 src/test/ssl/ssl/nss/client-revoked.crt__client-revoked.key.db/key4.db
 create mode 100644 src/test/ssl/ssl/nss/client-revoked.crt__client-revoked.key.db/pkcs11.txt
 create mode 100644 src/test/ssl/ssl/nss/client-revoked.pfx
 create mode 100644 src/test/ssl/ssl/nss/client.crl
 create mode 100644 src/test/ssl/ssl/nss/client.crt__client-encrypted-pem.key.db.pass
 create mode 100644 src/test/ssl/ssl/nss/client.crt__client-encrypted-pem.key.db/cert9.db
 create mode 100644 src/test/ssl/ssl/nss/client.crt__client-encrypted-pem.key.db/key4.db
 create mode 100644 src/test/ssl/ssl/nss/client.crt__client-encrypted-pem.key.db/pkcs11.txt
 create mode 100644 src/test/ssl/ssl/nss/client.crt__client.key.db/cert9.db
 create mode 100644 src/test/ssl/ssl/nss/client.crt__client.key.db/key4.db
 create mode 100644 src/test/ssl/ssl/nss/client.crt__client.key.db/pkcs11.txt
 create mode 100644 src/test/ssl/ssl/nss/client.pfx
 create mode 100644 src/test/ssl/ssl/nss/client_ca.crt.db/cert9.db
 create mode 100644 src/test/ssl/ssl/nss/client_ca.crt.db/key4.db
 create mode 100644 src/test/ssl/ssl/nss/client_ca.crt.db/pkcs11.txt
 create mode 100644 src/test/ssl/ssl/nss/root+client.crl
 create mode 100644 src/test/ssl/ssl/nss/root+client_ca.crt.db/cert9.db
 create mode 100644 src/test/ssl/ssl/nss/root+client_ca.crt.db/key4.db
 create mode 100644 src/test/ssl/ssl/nss/root+client_ca.crt.db/pkcs11.txt
 create mode 100644 src/test/ssl/ssl/nss/root+server_ca.crt.db/cert9.db
 create mode 100644 src/test/ssl/ssl/nss/root+server_ca.crt.db/key4.db
 create mode 100644 src/test/ssl/ssl/nss/root+server_ca.crt.db/pkcs11.txt
 create mode 100644 src/test/ssl/ssl/nss/root+server_ca.crt__root+server.crl.db/cert9.db
 create mode 100644 src/test/ssl/ssl/nss/root+server_ca.crt__root+server.crl.db/key4.db
 create mode 100644 src/test/ssl/ssl/nss/root+server_ca.crt__root+server.crl.db/pkcs11.txt
 create mode 100644 src/test/ssl/ssl/nss/root+server_ca.crt__server.crl.db/cert9.db
 create mode 100644 src/test/ssl/ssl/nss/root+server_ca.crt__server.crl.db/key4.db
 create mode 100644 src/test/ssl/ssl/nss/root+server_ca.crt__server.crl.db/pkcs11.txt
 create mode 100644 src/test/ssl/ssl/nss/root.crl
 create mode 100644 src/test/ssl/ssl/nss/server-cn-and-alt-names.crt__server-cn-and-alt-names.key.db/cert9.db
 create mode 100644 src/test/ssl/ssl/nss/server-cn-and-alt-names.crt__server-cn-and-alt-names.key.db/key4.db
 create mode 100644 src/test/ssl/ssl/nss/server-cn-and-alt-names.crt__server-cn-and-alt-names.key.db/pkcs11.txt
 create mode 100644 src/test/ssl/ssl/nss/server-cn-and-alt-names.pfx
 create mode 100644 src/test/ssl/ssl/nss/server-cn-only.crt__server-cn-only.key.db/cert9.db
 create mode 100644 src/test/ssl/ssl/nss/server-cn-only.crt__server-cn-only.key.db/key4.db
 create mode 100644 src/test/ssl/ssl/nss/server-cn-only.crt__server-cn-only.key.db/pkcs11.txt
 create mode 100644 src/test/ssl/ssl/nss/server-cn-only.crt__server-password.key.db/cert9.db
 create mode 100644 src/test/ssl/ssl/nss/server-cn-only.crt__server-password.key.db/key4.db
 create mode 100644 src/test/ssl/ssl/nss/server-cn-only.crt__server-password.key.db/pkcs11.txt
 create mode 100644 src/test/ssl/ssl/nss/server-cn-only.pfx
 create mode 100644 src/test/ssl/ssl/nss/server-multiple-alt-names.crt__server-multiple-alt-names.key.db/cert9.db
 create mode 100644 src/test/ssl/ssl/nss/server-multiple-alt-names.crt__server-multiple-alt-names.key.db/key4.db
 create mode 100644 src/test/ssl/ssl/nss/server-multiple-alt-names.crt__server-multiple-alt-names.key.db/pkcs11.txt
 create mode 100644 src/test/ssl/ssl/nss/server-multiple-alt-names.pfx
 create mode 100644 src/test/ssl/ssl/nss/server-no-names.crt__server-no-names.key.db/cert9.db
 create mode 100644 src/test/ssl/ssl/nss/server-no-names.crt__server-no-names.key.db/key4.db
 create mode 100644 src/test/ssl/ssl/nss/server-no-names.crt__server-no-names.key.db/pkcs11.txt
 create mode 100644 src/test/ssl/ssl/nss/server-no-names.pfx
 create mode 100644 src/test/ssl/ssl/nss/server-password.pfx
 create mode 100644 src/test/ssl/ssl/nss/server-revoked.crt__server-revoked.key.db/cert9.db
 create mode 100644 src/test/ssl/ssl/nss/server-revoked.crt__server-revoked.key.db/key4.db
 create mode 100644 src/test/ssl/ssl/nss/server-revoked.crt__server-revoked.key.db/pkcs11.txt
 create mode 100644 src/test/ssl/ssl/nss/server-revoked.pfx
 create mode 100644 src/test/ssl/ssl/nss/server-single-alt-name.crt__server-single-alt-name.key.db/cert9.db
 create mode 100644 src/test/ssl/ssl/nss/server-single-alt-name.crt__server-single-alt-name.key.db/key4.db
 create mode 100644 src/test/ssl/ssl/nss/server-single-alt-name.crt__server-single-alt-name.key.db/pkcs11.txt
 create mode 100644 src/test/ssl/ssl/nss/server-single-alt-name.pfx
 create mode 100644 src/test/ssl/ssl/nss/server.crl
 create mode 100644 src/test/ssl/ssl/nss/server_ca.crt.db/cert9.db
 create mode 100644 src/test/ssl/ssl/nss/server_ca.crt.db/key4.db
 create mode 100644 src/test/ssl/ssl/nss/server_ca.crt.db/pkcs11.txt
 create mode 100644 src/test/ssl/t/SSL/Backend/NSS.pm
 create mode 100644 src/test/ssl/t/SSL/Backend/OpenSSL.pm
 rename src/test/ssl/t/{SSLServer.pm => SSL/Server.pm} (78%)

diff --git a/configure b/configure
index 19a3cd09a0..55ba9526df 100755
--- a/configure
+++ b/configure
@@ -711,6 +711,7 @@ with_uuid
 with_readline
 with_systemd
 with_selinux
+with_nss
 with_openssl
 with_ldap
 with_krb_srvnam
@@ -857,6 +858,7 @@ with_bsd_auth
 with_ldap
 with_bonjour
 with_openssl
+with_nss
 with_selinux
 with_systemd
 with_readline
@@ -1559,6 +1561,7 @@ Optional Packages:
   --with-ldap             build with LDAP support
   --with-bonjour          build with Bonjour support
   --with-openssl          build with OpenSSL support
+  --with-nss              build with NSS support
   --with-selinux          build with SELinux support
   --with-systemd          build with systemd support
   --without-readline      do not use GNU Readline nor BSD Libedit for editing
@@ -8106,6 +8109,41 @@ fi
 $as_echo "$with_openssl" >&6; }
 
 
+#
+# LibNSS
+#
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether to build with NSS support" >&5
+$as_echo_n "checking whether to build with NSS support... " >&6; }
+
+
+
+# Check whether --with-nss was given.
+if test "${with_nss+set}" = set; then :
+  withval=$with_nss;
+  case $withval in
+    yes)
+
+$as_echo "#define USE_NSS 1" >>confdefs.h
+
+      ;;
+    no)
+      :
+      ;;
+    *)
+      as_fn_error $? "no argument expected for --with-nss option" "$LINENO" 5
+      ;;
+  esac
+
+else
+  with_nss=no
+
+fi
+
+
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $with_nss" >&5
+$as_echo "$with_nss" >&6; }
+
+
 #
 # SELinux
 #
@@ -12180,6 +12218,9 @@ fi
 fi
 
 if test "$with_openssl" = yes ; then
+  if test x"$with_nss" = x"yes" ; then
+    as_fn_error $? "multiple SSL backends cannot be enabled simultaneously\"" "$LINENO" 5
+  fi
     # Minimum required OpenSSL version is 1.0.1
 
 $as_echo "#define OPENSSL_API_COMPAT 0x10001000L" >>confdefs.h
@@ -12442,6 +12483,157 @@ done
 
 fi
 
+if test "$with_nss" = yes ; then
+  if test x"$with_openssl" = x"yes" ; then
+    as_fn_error $? "multiple SSL backends cannot be enabled simultaneously\"" "$LINENO" 5
+  fi
+  CLEANLDFLAGS="$LDFLAGS"
+  # TODO: document this set of LDFLAGS
+  LDFLAGS="-lssl3 -lsmime3 -lnss3 -lplds4 -lplc4 -lnspr4 $LDFLAGS"
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for SSL_VersionRangeSet in -lnss3" >&5
+$as_echo_n "checking for SSL_VersionRangeSet in -lnss3... " >&6; }
+if ${ac_cv_lib_nss3_SSL_VersionRangeSet+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lnss3  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char SSL_VersionRangeSet ();
+int
+main ()
+{
+return SSL_VersionRangeSet ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_lib_nss3_SSL_VersionRangeSet=yes
+else
+  ac_cv_lib_nss3_SSL_VersionRangeSet=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_nss3_SSL_VersionRangeSet" >&5
+$as_echo "$ac_cv_lib_nss3_SSL_VersionRangeSet" >&6; }
+if test "x$ac_cv_lib_nss3_SSL_VersionRangeSet" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_LIBNSS3 1
+_ACEOF
+
+  LIBS="-lnss3 $LIBS"
+
+else
+  as_fn_error $? "library 'nss3' is required for NSS" "$LINENO" 5
+fi
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for PR_GetDefaultIOMethods in -lnspr4" >&5
+$as_echo_n "checking for PR_GetDefaultIOMethods in -lnspr4... " >&6; }
+if ${ac_cv_lib_nspr4_PR_GetDefaultIOMethods+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lnspr4  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char PR_GetDefaultIOMethods ();
+int
+main ()
+{
+return PR_GetDefaultIOMethods ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_lib_nspr4_PR_GetDefaultIOMethods=yes
+else
+  ac_cv_lib_nspr4_PR_GetDefaultIOMethods=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_nspr4_PR_GetDefaultIOMethods" >&5
+$as_echo "$ac_cv_lib_nspr4_PR_GetDefaultIOMethods" >&6; }
+if test "x$ac_cv_lib_nspr4_PR_GetDefaultIOMethods" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_LIBNSPR4 1
+_ACEOF
+
+  LIBS="-lnspr4 $LIBS"
+
+else
+  as_fn_error $? "library 'nspr4' is required for NSS" "$LINENO" 5
+fi
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for SSL_GetImplementedCiphers in -lssl3" >&5
+$as_echo_n "checking for SSL_GetImplementedCiphers in -lssl3... " >&6; }
+if ${ac_cv_lib_ssl3_SSL_GetImplementedCiphers+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lssl3  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char SSL_GetImplementedCiphers ();
+int
+main ()
+{
+return SSL_GetImplementedCiphers ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_lib_ssl3_SSL_GetImplementedCiphers=yes
+else
+  ac_cv_lib_ssl3_SSL_GetImplementedCiphers=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_ssl3_SSL_GetImplementedCiphers" >&5
+$as_echo "$ac_cv_lib_ssl3_SSL_GetImplementedCiphers" >&6; }
+if test "x$ac_cv_lib_ssl3_SSL_GetImplementedCiphers" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_LIBSSL3 1
+_ACEOF
+
+  LIBS="-lssl3 $LIBS"
+
+else
+  as_fn_error $? "library 'ssl3' is required for NSS" "$LINENO" 5
+fi
+
+  LDFLAGS="$CLEANLDFLAGS"
+fi
+
 if test "$with_pam" = yes ; then
   { $as_echo "$as_me:${as_lineno-$LINENO}: checking for pam_start in -lpam" >&5
 $as_echo_n "checking for pam_start in -lpam... " >&6; }
@@ -13344,6 +13536,25 @@ else
 fi
 
 
+fi
+
+if test "$with_nss" = yes ; then
+  ac_fn_c_check_header_mongrel "$LINENO" "ssl.h" "ac_cv_header_ssl_h" "$ac_includes_default"
+if test "x$ac_cv_header_ssl_h" = xyes; then :
+
+else
+  as_fn_error $? "header file <ssl.h> is required for NSS" "$LINENO" 5
+fi
+
+
+  ac_fn_c_check_header_mongrel "$LINENO" "nss.h" "ac_cv_header_nss_h" "$ac_includes_default"
+if test "x$ac_cv_header_nss_h" = xyes; then :
+
+else
+  as_fn_error $? "header file <nss.h> is required for NSS" "$LINENO" 5
+fi
+
+
 fi
 
 if test "$with_pam" = yes ; then
diff --git a/configure.ac b/configure.ac
index 6b9d0487a8..970bebb24a 100644
--- a/configure.ac
+++ b/configure.ac
@@ -861,6 +861,15 @@ PGAC_ARG_BOOL(with, openssl, no, [build with OpenSSL support],
 AC_MSG_RESULT([$with_openssl])
 AC_SUBST(with_openssl)
 
+#
+# LibNSS
+#
+AC_MSG_CHECKING([whether to build with NSS support])
+PGAC_ARG_BOOL(with, nss, no, [build with NSS support],
+              [AC_DEFINE([USE_NSS], 1, [Define to build with NSS support. (--with-nss)])])
+AC_MSG_RESULT([$with_nss])
+AC_SUBST(with_nss)
+
 #
 # SELinux
 #
@@ -1210,6 +1219,9 @@ if test "$with_gssapi" = yes ; then
 fi
 
 if test "$with_openssl" = yes ; then
+  if test x"$with_nss" = x"yes" ; then
+    AC_MSG_ERROR([multiple SSL backends cannot be enabled simultaneously"])
+  fi
   dnl Order matters!
   # Minimum required OpenSSL version is 1.0.1
   AC_DEFINE(OPENSSL_API_COMPAT, [0x10001000L],
@@ -1235,6 +1247,19 @@ if test "$with_openssl" = yes ; then
   AC_CHECK_FUNCS([CRYPTO_lock])
 fi
 
+if test "$with_nss" = yes ; then
+  if test x"$with_openssl" = x"yes" ; then
+    AC_MSG_ERROR([multiple SSL backends cannot be enabled simultaneously"])
+  fi
+  CLEANLDFLAGS="$LDFLAGS"
+  # TODO: document this set of LDFLAGS
+  LDFLAGS="-lssl3 -lsmime3 -lnss3 -lplds4 -lplc4 -lnspr4 $LDFLAGS"
+  AC_CHECK_LIB(nss3, SSL_VersionRangeSet, [], [AC_MSG_ERROR([library 'nss3' is required for NSS])])
+  AC_CHECK_LIB(nspr4, PR_GetDefaultIOMethods, [], [AC_MSG_ERROR([library 'nspr4' is required for NSS])])
+  AC_CHECK_LIB(ssl3, SSL_GetImplementedCiphers, [], [AC_MSG_ERROR([library 'ssl3' is required for NSS])])
+  LDFLAGS="$CLEANLDFLAGS"
+fi
+
 if test "$with_pam" = yes ; then
   AC_CHECK_LIB(pam,    pam_start, [], [AC_MSG_ERROR([library 'pam' is required for PAM])])
 fi
@@ -1410,6 +1435,11 @@ if test "$with_openssl" = yes ; then
   AC_CHECK_HEADER(openssl/err.h, [], [AC_MSG_ERROR([header file <openssl/err.h> is required for OpenSSL])])
 fi
 
+if test "$with_nss" = yes ; then
+  AC_CHECK_HEADER(ssl.h, [], [AC_MSG_ERROR([header file <ssl.h> is required for NSS])])
+  AC_CHECK_HEADER(nss.h, [], [AC_MSG_ERROR([header file <nss.h> is required for NSS])])
+fi
+
 if test "$with_pam" = yes ; then
   AC_CHECK_HEADERS(security/pam_appl.h, [],
                    [AC_CHECK_HEADERS(pam/pam_appl.h, [],
diff --git a/contrib/Makefile b/contrib/Makefile
index c8d2a16273..57fa998526 100644
--- a/contrib/Makefile
+++ b/contrib/Makefile
@@ -51,7 +51,7 @@ SUBDIRS = \
 		unaccent	\
 		vacuumlo
 
-ifeq ($(with_openssl),yes)
+ifeq ($(with_ssl),yes)
 SUBDIRS += sslinfo
 else
 ALWAYS_SUBDIRS += sslinfo
diff --git a/contrib/postgres_fdw/expected/postgres_fdw.out b/contrib/postgres_fdw/expected/postgres_fdw.out
index 84bc0ee381..c3693283d2 100644
--- a/contrib/postgres_fdw/expected/postgres_fdw.out
+++ b/contrib/postgres_fdw/expected/postgres_fdw.out
@@ -8919,7 +8919,7 @@ DO $d$
     END;
 $d$;
 ERROR:  invalid option "password"
-HINT:  Valid options in this context are: service, passfile, channel_binding, connect_timeout, dbname, host, hostaddr, port, options, application_name, keepalives, keepalives_idle, keepalives_interval, keepalives_count, tcp_user_timeout, sslmode, sslcompression, sslcert, sslkey, sslrootcert, sslcrl, requirepeer, ssl_min_protocol_version, ssl_max_protocol_version, gssencmode, krbsrvname, gsslib, target_session_attrs, use_remote_estimate, fdw_startup_cost, fdw_tuple_cost, extensions, updatable, fetch_size
+HINT:  Valid options in this context are: service, passfile, channel_binding, connect_timeout, dbname, host, hostaddr, port, options, application_name, keepalives, keepalives_idle, keepalives_interval, keepalives_count, tcp_user_timeout, sslmode, sslcompression, sslcert, sslkey, sslrootcert, sslcrl, requirepeer, ssl_min_protocol_version, ssl_max_protocol_version, gssencmode, krbsrvname, gsslib, target_session_attrs, cert_database, use_remote_estimate, fdw_startup_cost, fdw_tuple_cost, extensions, updatable, fetch_size
 CONTEXT:  SQL statement "ALTER SERVER loopback_nopw OPTIONS (ADD password 'dummypw')"
 PL/pgSQL function inline_code_block line 3 at EXECUTE
 -- If we add a password for our user mapping instead, we should get a different
diff --git a/contrib/sslinfo/sslinfo.c b/contrib/sslinfo/sslinfo.c
index 5ba3988e27..84bb2c65b8 100644
--- a/contrib/sslinfo/sslinfo.c
+++ b/contrib/sslinfo/sslinfo.c
@@ -9,9 +9,11 @@
 
 #include "postgres.h"
 
+#ifdef USE_OPENSSL
 #include <openssl/x509.h>
 #include <openssl/x509v3.h>
 #include <openssl/asn1.h>
+#endif
 
 #include "access/htup_details.h"
 #include "funcapi.h"
@@ -21,8 +23,8 @@
 
 PG_MODULE_MAGIC;
 
+#ifdef USE_OPENSSL
 static Datum X509_NAME_field_to_text(X509_NAME *name, text *fieldName);
-static Datum X509_NAME_to_text(X509_NAME *name);
 static Datum ASN1_STRING_to_text(ASN1_STRING *str);
 
 /*
@@ -32,6 +34,7 @@ typedef struct
 {
 	TupleDesc	tupdesc;
 } SSLExtensionInfoContext;
+#endif
 
 /*
  * Indicates whether current session uses SSL
@@ -54,9 +57,16 @@ PG_FUNCTION_INFO_V1(ssl_version);
 Datum
 ssl_version(PG_FUNCTION_ARGS)
 {
-	if (MyProcPort->ssl == NULL)
+	const char *version;
+
+	if (!MyProcPort->ssl_in_use)
+		PG_RETURN_NULL();
+
+	version = be_tls_get_version(MyProcPort);
+	if (version == NULL)
 		PG_RETURN_NULL();
-	PG_RETURN_TEXT_P(cstring_to_text(SSL_get_version(MyProcPort->ssl)));
+
+	PG_RETURN_TEXT_P(cstring_to_text(version));
 }
 
 
@@ -67,9 +77,16 @@ PG_FUNCTION_INFO_V1(ssl_cipher);
 Datum
 ssl_cipher(PG_FUNCTION_ARGS)
 {
-	if (MyProcPort->ssl == NULL)
+	const char *cipher;
+
+	if (!MyProcPort->ssl_in_use)
 		PG_RETURN_NULL();
-	PG_RETURN_TEXT_P(cstring_to_text(SSL_get_cipher(MyProcPort->ssl)));
+
+	cipher = be_tls_get_cipher(MyProcPort);
+	if (cipher == NULL)
+		PG_RETURN_NULL();
+
+	PG_RETURN_TEXT_P(cstring_to_text(cipher));
 }
 
 
@@ -83,7 +100,7 @@ PG_FUNCTION_INFO_V1(ssl_client_cert_present);
 Datum
 ssl_client_cert_present(PG_FUNCTION_ARGS)
 {
-	PG_RETURN_BOOL(MyProcPort->peer != NULL);
+	PG_RETURN_BOOL(MyProcPort->peer_cert_valid);
 }
 
 
@@ -99,29 +116,26 @@ PG_FUNCTION_INFO_V1(ssl_client_serial);
 Datum
 ssl_client_serial(PG_FUNCTION_ARGS)
 {
+	char decimal[NAMEDATALEN];
 	Datum		result;
-	Port	   *port = MyProcPort;
-	X509	   *peer = port->peer;
-	ASN1_INTEGER *serial = NULL;
-	BIGNUM	   *b;
-	char	   *decimal;
 
-	if (!peer)
+	if (!MyProcPort->ssl_in_use || !MyProcPort->peer_cert_valid)
+		PG_RETURN_NULL();
+
+	be_tls_get_peer_serial(MyProcPort, decimal, NAMEDATALEN);
+
+	if (!*decimal)
 		PG_RETURN_NULL();
-	serial = X509_get_serialNumber(peer);
-	b = ASN1_INTEGER_to_BN(serial, NULL);
-	decimal = BN_bn2dec(b);
 
-	BN_free(b);
 	result = DirectFunctionCall3(numeric_in,
 								 CStringGetDatum(decimal),
 								 ObjectIdGetDatum(0),
 								 Int32GetDatum(-1));
-	OPENSSL_free(decimal);
 	return result;
 }
 
 
+#ifdef USE_OPENSSL
 /*
  * Converts OpenSSL ASN1_STRING structure into text
  *
@@ -228,7 +242,7 @@ ssl_client_dn_field(PG_FUNCTION_ARGS)
 	text	   *fieldname = PG_GETARG_TEXT_PP(0);
 	Datum		result;
 
-	if (!(MyProcPort->peer))
+	if (!MyProcPort->ssl_in_use || !MyProcPort->peer_cert_valid)
 		PG_RETURN_NULL();
 
 	result = X509_NAME_field_to_text(X509_get_subject_name(MyProcPort->peer), fieldname);
@@ -273,76 +287,23 @@ ssl_issuer_field(PG_FUNCTION_ARGS)
 	else
 		return result;
 }
+#endif							/* USE_OPENSSL */
 
-
-/*
- * Equivalent of X509_NAME_oneline that respects encoding
- *
- * This function converts X509_NAME structure to the text variable
- * converting all textual data into current database encoding.
- *
- * Parameter: X509_NAME *name X509_NAME structure to be converted
- *
- * Returns: text datum which contains string representation of
- * X509_NAME
- */
-static Datum
-X509_NAME_to_text(X509_NAME *name)
+#ifdef USE_NSS
+PG_FUNCTION_INFO_V1(ssl_client_dn_field);
+Datum
+ssl_client_dn_field(PG_FUNCTION_ARGS)
 {
-	BIO		   *membuf = BIO_new(BIO_s_mem());
-	int			i,
-				nid,
-				count = X509_NAME_entry_count(name);
-	X509_NAME_ENTRY *e;
-	ASN1_STRING *v;
-	const char *field_name;
-	size_t		size;
-	char		nullterm;
-	char	   *sp;
-	char	   *dp;
-	text	   *result;
-
-	if (membuf == NULL)
-		ereport(ERROR,
-				(errcode(ERRCODE_OUT_OF_MEMORY),
-				 errmsg("could not create OpenSSL BIO structure")));
-
-	(void) BIO_set_close(membuf, BIO_CLOSE);
-	for (i = 0; i < count; i++)
-	{
-		e = X509_NAME_get_entry(name, i);
-		nid = OBJ_obj2nid(X509_NAME_ENTRY_get_object(e));
-		if (nid == NID_undef)
-			ereport(ERROR,
-					(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
-					 errmsg("could not get NID for ASN1_OBJECT object")));
-		v = X509_NAME_ENTRY_get_data(e);
-		field_name = OBJ_nid2sn(nid);
-		if (field_name == NULL)
-			field_name = OBJ_nid2ln(nid);
-		if (field_name == NULL)
-			ereport(ERROR,
-					(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
-					 errmsg("could not convert NID %d to an ASN1_OBJECT structure", nid)));
-		BIO_printf(membuf, "/%s=", field_name);
-		ASN1_STRING_print_ex(membuf, v,
-							 ((ASN1_STRFLGS_RFC2253 & ~ASN1_STRFLGS_ESC_MSB)
-							  | ASN1_STRFLGS_UTF8_CONVERT));
-	}
-
-	/* ensure null termination of the BIO's content */
-	nullterm = '\0';
-	BIO_write(membuf, &nullterm, 1);
-	size = BIO_get_mem_data(membuf, &sp);
-	dp = pg_any_to_server(sp, size - 1, PG_UTF8);
-	result = cstring_to_text(dp);
-	if (dp != sp)
-		pfree(dp);
-	if (BIO_free(membuf) != 1)
-		elog(ERROR, "could not free OpenSSL BIO structure");
+	PG_RETURN_NULL();
+}
 
-	PG_RETURN_TEXT_P(result);
+PG_FUNCTION_INFO_V1(ssl_issuer_field);
+Datum
+ssl_issuer_field(PG_FUNCTION_ARGS)
+{
+	PG_RETURN_NULL();
 }
+#endif							/* USE_NSS */
 
 
 /*
@@ -358,9 +319,17 @@ PG_FUNCTION_INFO_V1(ssl_client_dn);
 Datum
 ssl_client_dn(PG_FUNCTION_ARGS)
 {
-	if (!(MyProcPort->peer))
+	char		subject[NAMEDATALEN];
+
+	if (!MyProcPort->ssl_in_use || !MyProcPort->peer_cert_valid)
+		PG_RETURN_NULL();
+
+	be_tls_get_peer_subject_name(MyProcPort, subject, NAMEDATALEN);
+
+	if (!*subject)
 		PG_RETURN_NULL();
-	return X509_NAME_to_text(X509_get_subject_name(MyProcPort->peer));
+
+	PG_RETURN_TEXT_P(cstring_to_text(subject));
 }
 
 
@@ -377,12 +346,21 @@ PG_FUNCTION_INFO_V1(ssl_issuer_dn);
 Datum
 ssl_issuer_dn(PG_FUNCTION_ARGS)
 {
-	if (!(MyProcPort->peer))
+	char		issuer[NAMEDATALEN];
+
+	if (!MyProcPort->ssl_in_use || !MyProcPort->peer_cert_valid)
+		PG_RETURN_NULL();
+
+	be_tls_get_peer_issuer_name(MyProcPort, issuer, NAMEDATALEN);
+
+	if (!*issuer)
 		PG_RETURN_NULL();
-	return X509_NAME_to_text(X509_get_issuer_name(MyProcPort->peer));
+
+	PG_RETURN_TEXT_P(cstring_to_text(issuer));
 }
 
 
+#ifdef USE_OPENSSL
 /*
  * Returns information about available SSL extensions.
  *
@@ -516,3 +494,13 @@ ssl_extension_info(PG_FUNCTION_ARGS)
 	/* All done */
 	SRF_RETURN_DONE(funcctx);
 }
+#endif							/* USE_OPENSSL */
+
+#ifdef USE_NSS
+PG_FUNCTION_INFO_V1(ssl_extension_info);
+Datum
+ssl_extension_info(PG_FUNCTION_ARGS)
+{
+	PG_RETURN_NULL();
+}
+#endif							/* USE_NSS */
diff --git a/doc/src/sgml/acronyms.sgml b/doc/src/sgml/acronyms.sgml
index 4e5ec983c0..4f6f0cf353 100644
--- a/doc/src/sgml/acronyms.sgml
+++ b/doc/src/sgml/acronyms.sgml
@@ -441,6 +441,28 @@
     </listitem>
    </varlistentry>
 
+   <varlistentry>
+    <term><acronym>NSPR</acronym></term>
+    <listitem>
+     <para>
+      <ulink
+      url="https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSPR">
+      Netscape Portable Runtime</ulink>
+     </para>
+    </listitem>
+   </varlistentry>
+
+   <varlistentry>
+    <term><acronym>NSS</acronym></term>
+    <listitem>
+     <para>
+      <ulink
+      url="https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS">
+      Network Security Services</ulink>
+     </para>
+    </listitem>
+   </varlistentry>
+
    <varlistentry>
     <term><acronym>ODBC</acronym></term>
     <listitem>
@@ -539,6 +561,17 @@
     </listitem>
    </varlistentry>
 
+   <varlistentry>
+    <term><acronym>PKCS#12</acronym></term>
+    <listitem>
+     <para>
+      <ulink
+      url="https://en.wikipedia.org/wiki/PKCS_12">
+      Public-Key Cryptography Standards #12</ulink>
+     </para>
+    </listitem>
+   </varlistentry>
+
    <varlistentry>
     <term><acronym>PL</acronym></term>
     <listitem>
@@ -684,6 +717,16 @@
     </listitem>
    </varlistentry>
 
+   <varlistentry>
+    <term><acronym>TLS</acronym></term>
+    <listitem>
+     <para>
+      <ulink url="https://sv.wikipedia.org/wiki/Transport_Layer_Security">
+      Transport Layer Security</ulink>
+     </para>
+    </listitem>
+   </varlistentry>
+
    <varlistentry>
     <term><acronym>TOAST</acronym></term>
     <listitem>
diff --git a/doc/src/sgml/config.sgml b/doc/src/sgml/config.sgml
index 2c75876e32..3859fb39f1 100644
--- a/doc/src/sgml/config.sgml
+++ b/doc/src/sgml/config.sgml
@@ -1208,6 +1208,23 @@ include_dir 'conf.d'
       </listitem>
      </varlistentry>
 
+     <varlistentry id="guc-ssl-database" xreflabel="ssl_database">
+      <term><varname>ssl_database</varname> (<type>string</type>)
+      <indexterm>
+       <primary><varname>ssl_database</varname> configuration parameter</primary>
+      </indexterm>
+      </term>
+      <listitem>
+       <para>
+        Specifies the name of the file containing the server certificates and
+        keys when using <productname>NSS</productname> for <acronym>SSL</acronym>
+        connections. This parameter can only be set in the
+        <filename>postgresql.conf</filename> file or on the server command
+        line.
+       </para>
+      </listitem>
+     </varlistentry>
+
      <varlistentry id="guc-ssl-ciphers" xreflabel="ssl_ciphers">
       <term><varname>ssl_ciphers</varname> (<type>string</type>)
       <indexterm>
@@ -1224,7 +1241,9 @@ include_dir 'conf.d'
         connections using TLS version 1.2 and lower are affected.  There is
         currently no setting that controls the cipher choices used by TLS
         version 1.3 connections.  The default value is
-        <literal>HIGH:MEDIUM:+3DES:!aNULL</literal>.  The default is usually a
+        <literal>HIGH:MEDIUM:+3DES:!aNULL</literal> for servers which have
+        been built with <productname>OpenSSL</productname> as the
+        <acronym>SSL</acronym> library.  The default is usually a
         reasonable choice unless you have specific security requirements.
        </para>
 
diff --git a/doc/src/sgml/installation.sgml b/doc/src/sgml/installation.sgml
index b585f22408..60cd6ff8de 100644
--- a/doc/src/sgml/installation.sgml
+++ b/doc/src/sgml/installation.sgml
@@ -250,7 +250,7 @@ su - postgres
 
     <listitem>
      <para>
-      You need <productname>OpenSSL</productname>, if you want to support
+      You need a supported <acronym>SSL</acronym> library, if you want to support
       encrypted client connections.  <productname>OpenSSL</productname> is
       also required for random number generation on platforms that do not
       have <filename>/dev/urandom</filename> (except Windows).  The minimum
@@ -969,6 +969,31 @@ build-postgresql:
        </listitem>
       </varlistentry>
 
+      <varlistentry>
+       <term><option>--with-nss</option>
+       <indexterm>
+        <primary>NSS</primary>
+        <secondary>NSPR</secondary>
+        <seealso>SSL</seealso>
+       </indexterm>
+       </term>
+       <listitem>
+        <para>
+         Build with support for <acronym>SSL</acronym> (encrypted)
+         connections using <productname>NSS</productname>. This requires the
+         <productname>NSS</productname> package to be installed. Additionally,
+         <productname>NSS</productname> requires <productname>NSPR</productname>
+         to be installed. <filename>configure</filename> will check for the
+         required header files and libraries to make sure that your
+         <productname>NSS</productname> installation is sufficient before
+         proceeding.
+        </para>
+        <para>
+         This option is incompatible with <literal>--with-openssl</literal>.
+        </para>
+       </listitem>
+      </varlistentry>
+
       <varlistentry>
        <term><option>--with-openssl</option>
        <indexterm>
@@ -985,6 +1010,9 @@ build-postgresql:
          your <productname>OpenSSL</productname> installation is sufficient
          before proceeding.
         </para>
+        <para>
+         This option is incompatible with <literal>--with-nss</literal>.
+        </para>
        </listitem>
       </varlistentry>
 
diff --git a/doc/src/sgml/libpq.sgml b/doc/src/sgml/libpq.sgml
index b50391caee..cd8e170938 100644
--- a/doc/src/sgml/libpq.sgml
+++ b/doc/src/sgml/libpq.sgml
@@ -2497,9 +2497,14 @@ void *PQsslStruct(const PGconn *conn, const char *struct_name);
 ]]></programlisting>
       </para>
       <para>
-       This structure can be used to verify encryption levels, check server
-       certificates, and more. Refer to the <productname>OpenSSL</productname>
-       documentation for information about this structure.
+       For <productname>NSS</productname>, there is one struct available under
+       the name "NSS", and it returns a pointer to the
+       <productname>NSS</productname> <literal>PRFileDesc</literal>.
+      </para>
+      <para>
+       These structures can be used to verify encryption levels, check server
+       certificates, and more. Refer to the <acronym>SSL</acronym> library
+       documentation for information about these structures.
       </para>
      </listitem>
     </varlistentry>
@@ -2526,6 +2531,10 @@ void *PQgetssl(const PGconn *conn);
        <xref linkend="libpq-PQsslInUse"/> instead, and for more details about the
        connection, use <xref linkend="libpq-PQsslAttribute"/>.
       </para>
+      <para>
+       This function returns <literal>NULL</literal> when <acronym>SSL</acronym>
+       librariaes other than <productname>OpenSSL</productname> are used.
+      </para>
      </listitem>
     </varlistentry>
 
@@ -7958,6 +7967,11 @@ void PQinitOpenSSL(int do_ssl, int do_crypto);
        before first opening a database connection.  Also be sure that you
        have done that initialization before opening a database connection.
       </para>
+
+      <para>
+       This function does nothing when using <productname>NSS</productname> as
+       the <acronym>SSL</acronym> library.
+      </para>
      </listitem>
     </varlistentry>
 
@@ -7984,6 +7998,11 @@ void PQinitSSL(int do_ssl);
        might be preferable for applications that need to work with older
        versions of <application>libpq</application>.
       </para>
+
+      <para>
+       This function does nothing when using <productname>NSS</productname> as
+       the <acronym>SSL</acronym> library.
+      </para>
      </listitem>
     </varlistentry>
    </variablelist>
diff --git a/doc/src/sgml/runtime.sgml b/doc/src/sgml/runtime.sgml
index f584231935..bfc8218c7b 100644
--- a/doc/src/sgml/runtime.sgml
+++ b/doc/src/sgml/runtime.sgml
@@ -2183,15 +2183,21 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
 
   <indexterm zone="ssl-tcp">
    <primary>SSL</primary>
+   <secondary>TLS</secondary>
   </indexterm>
 
   <para>
    <productname>PostgreSQL</productname> has native support for using
    <acronym>SSL</acronym> connections to encrypt client/server communications
    for increased security. This requires that
-   <productname>OpenSSL</productname> is installed on both client and
+   a supported TLS library is installed on both client and
    server systems and that support in <productname>PostgreSQL</productname> is
    enabled at build time (see <xref linkend="installation"/>).
+   Supported libraries are <productname>OpenSSL</productname> and
+   <productname>NSS</productname>. The terms <acronym>SSL</acronym> and
+   <acronym>TLS</acronym> are often used interchangeably to mean a secure
+   connection using a <acronym>TLS</acronym> protocol, even though
+   <acronym>SSL</acronym> protocols are no longer supported.
   </para>
 
   <sect2 id="ssl-setup">
@@ -2211,8 +2217,13 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
   </para>
 
   <para>
-   To start in <acronym>SSL</acronym> mode, files containing the server certificate
-   and private key must exist.  By default, these files are expected to be
+   To start in <acronym>SSL</acronym> mode, a server certificate
+   and private key must exist. The below sections on the different libraries
+   will discuss how to configure these.
+  </para>
+   
+  <para>
+   By default, these files are expected to be
    named <filename>server.crt</filename> and <filename>server.key</filename>, respectively, in
    the server's data directory, but other names and locations can be specified
    using the configuration parameters <xref linkend="guc-ssl-cert-file"/>
@@ -2302,6 +2313,18 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
   </note>
   </sect2>
 
+  <sect2 id="ssl-nss-config">
+   <title>NSS Configuration</title>
+
+  <para>
+   <productname>PostgreSQL</productname> will look for certificates and keys
+   in the <productname>NSS</productname> database specified by the parameter
+   <xref linkend="guc-ssl-database"/> in <filename>postgresql.conf</filename>.
+   The paramaters for certificate and key filenames are used to identify the
+   nicknames in the database.
+  </para>
+  </sect2>
+
   <sect2 id="ssl-client-certificates">
    <title>Using Client Certificates</title>
 
@@ -2377,7 +2400,7 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
   </sect2>
 
   <sect2 id="ssl-server-files">
-   <title>SSL Server File Usage</title>
+   <title>SSL Server File Parameter Usage</title>
 
    <para>
     <xref linkend="ssl-file-usage"/> summarizes the files that are
@@ -2424,6 +2447,14 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
       <entry>client certificate must not be on this list</entry>
      </row>
 
+     <row>
+      <entry><xref linkend="guc-ssl-database"/></entry>
+      <entry>certificate database</entry>
+      <entry>contains server certificates, keys and revocation lists; only
+      used when <productname>PostgreSQL</productname> is built with support
+      for <productname>NSS</productname>.</entry>
+     </row>
+
     </tbody>
    </tgroup>
   </table>
@@ -2551,6 +2582,45 @@ openssl x509 -req -in server.csr -text -days 365 \
    </para>
   </sect2>
 
+  <sect2 id="nss-certificate-database">
+   <title>NSS Certificate Databases</title>
+
+   <para>
+    When using <productname>NSS</productname>, all certificates and keys must
+    be loaded into an <productname>NSS</productname> certificate database.
+   </para>
+
+   <para>
+    To create a new <productname>NSS</productname> certificate database and
+    load the certificates created in <xref linkend="ssl-certificate-creation" />,
+    use the following <productname>NSS</productname> commands:
+<programlisting>
+certutil -d "sql:server.db" -N --empty-password
+certutil -d "sql:server.db" -A -n server.crt -i server.crt -t "CT,C,C"
+certutil -d "sql:server.db" -A -n root.crt -i root.crt -t "CT,C,C"
+</programlisting>
+    This will give the certificate the filename as the nickname identifier in
+    the database which is created as <filename>server.db</filename>.
+   </para>
+   <para>
+    Then load the server key, which require converting it to
+    <acronym>PKCS#12</acronym> format using the
+    <productname>OpenSSL</productname> tools:
+<programlisting>
+openssl pkcs12 -export -out server.pfx -inkey server.key -in server.crt \
+  -certfile root.crt -passout pass:
+pk12util -i server.pfx -d server.db -W ''
+</programlisting>
+   </para>
+   <para>
+    Finally a certificate revocation list can be loaded with the following
+    commands:
+<programlisting>
+crlutil -I -i server.crl -d server.db -B
+</programlisting>
+   </para>
+  </sect2>
+
  </sect1>
 
  <sect1 id="gssapi-enc">
diff --git a/doc/src/sgml/sslinfo.sgml b/doc/src/sgml/sslinfo.sgml
index e16f61b41d..253bb697af 100644
--- a/doc/src/sgml/sslinfo.sgml
+++ b/doc/src/sgml/sslinfo.sgml
@@ -22,7 +22,8 @@
 
  <para>
   This extension won't build at all unless the installation was
-  configured with <literal>--with-openssl</literal>.
+  configured with SSL support, such as <literal>--with-openssl</literal>
+  or <literal>--with-nss</literal>.
  </para>
 
  <sect2>
@@ -54,7 +55,7 @@
     <listitem>
     <para>
      Returns the name of the protocol used for the SSL connection (e.g., TLSv1.0
-     TLSv1.1, or TLSv1.2).
+     TLSv1.1, TLSv1.2 or TLSv1.3).
     </para>
     </listitem>
    </varlistentry>
@@ -208,6 +209,9 @@ emailAddress
      the X.500 and X.509 standards, so you cannot just assign arbitrary
      meaning to them.
     </para>
+    <para>
+     This function is only available when using <productname>OpenSSL</productname>.
+    </para>
     </listitem>
    </varlistentry>
 
@@ -223,6 +227,9 @@ emailAddress
      Same as <function>ssl_client_dn_field</function>, but for the certificate issuer
      rather than the certificate subject.
     </para>
+    <para>
+     This function is only available when using <productname>OpenSSL</productname>.
+    </para>
     </listitem>
    </varlistentry>
 
@@ -238,6 +245,9 @@ emailAddress
      Provide information about extensions of client certificate: extension name,
      extension value, and if it is a critical extension.
     </para>
+    <para>
+     This function is only available when using <productname>OpenSSL</productname>.
+    </para>
     </listitem>
    </varlistentry>
   </variablelist>
diff --git a/src/Makefile.global.in b/src/Makefile.global.in
index 7ca1e9aac5..8946fa696a 100644
--- a/src/Makefile.global.in
+++ b/src/Makefile.global.in
@@ -184,6 +184,7 @@ with_perl	= @with_perl@
 with_python	= @with_python@
 with_tcl	= @with_tcl@
 with_openssl	= @with_openssl@
+with_nss        = @with_nss@
 with_readline	= @with_readline@
 with_selinux	= @with_selinux@
 with_systemd	= @with_systemd@
@@ -232,6 +233,15 @@ CLANG = @CLANG@
 BITCODE_CFLAGS = @BITCODE_CFLAGS@
 BITCODE_CXXFLAGS = @BITCODE_CXXFLAGS@
 
+ifeq ($(with_openssl),yes)
+with_ssl = yes
+else ifeq ($(with_nss),yes)
+with_ssl = yes
+else
+with_ssl = no
+endif
+
+
 ##########################################################################
 #
 # Programs and flags
diff --git a/src/backend/libpq/Makefile b/src/backend/libpq/Makefile
index efc5ef760a..191266a426 100644
--- a/src/backend/libpq/Makefile
+++ b/src/backend/libpq/Makefile
@@ -30,6 +30,10 @@ OBJS = \
 
 ifeq ($(with_openssl),yes)
 OBJS += be-secure-openssl.o
+else
+ifeq ($(with_nss),yes)
+OBJS += be-secure-nss.o
+endif
 endif
 
 ifeq ($(with_gssapi),yes)
diff --git a/src/backend/libpq/auth.c b/src/backend/libpq/auth.c
index 36565df4fc..ea6d97585e 100644
--- a/src/backend/libpq/auth.c
+++ b/src/backend/libpq/auth.c
@@ -2870,7 +2870,14 @@ CheckCertAuth(Port *port)
 {
 	int			status_check_usermap = STATUS_ERROR;
 
+#if defined(USE_OPENSSL)
 	Assert(port->ssl);
+#elif defined(USE_NSS)
+	/* TODO: should we rename pr_fd to ssl, to keep consistency? */
+	Assert(port->pr_fd);
+#else
+	Assert(false);
+#endif
 
 	/* Make sure we have received a username in the certificate */
 	if (port->peer_cn == NULL ||
diff --git a/src/backend/libpq/be-secure-nss.c b/src/backend/libpq/be-secure-nss.c
new file mode 100644
index 0000000000..fe6540852b
--- /dev/null
+++ b/src/backend/libpq/be-secure-nss.c
@@ -0,0 +1,1038 @@
+/*-------------------------------------------------------------------------
+ *
+ * be-secure-nss.c
+ *	  functions for supporting NSS as a TLS backend
+ *
+ *
+ * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ *	  src/backend/libpq/be-secure-nss.c
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#include "postgres.h"
+
+#include <sys/stat.h>
+
+/*
+ * BITS_PER_BYTE is also defined in the NSPR header fils, so we need to undef
+ * our version to avoid compiler warnings on redefinition.
+ */
+#define pg_BITS_PER_BYTE BITS_PER_BYTE
+#undef BITS_PER_BYTE
+
+/*
+ * The nspr/obsolete/protypes.h NSPR header typedefs uint64 and int64 with
+ * colliding definitions from ours, causing a much expected compiler error.
+ * The definitions are however not actually used in NSPR at all, and are only
+ * intended for what seems to be backwards compatibility for apps written
+ * against old versions of NSPR.  The following comment is in the referenced
+ * file, and was added in 1998:
+ *
+ *		This section typedefs the old 'native' types to the new PR<type>s.
+ *		These definitions are scheduled to be eliminated at the earliest
+ *		possible time. The NSPR API is implemented and documented using
+ *		the new definitions.
+ *
+ * As there is no opt-out from pulling in these typedefs, we define the guard
+ * for the file to exclude it. This is incredibly ugly, but seems to be about
+ * the only way around it.
+ */
+#define PROTYPES_H
+#include <nspr.h>
+#undef PROTYPES_H
+#include <nss.h>
+#include <prio.h>
+#include <ssl.h>
+#include <sslerr.h>
+#include <secerr.h>
+#include <sslproto.h>
+#include <prtypes.h>
+#include <pk11pub.h>
+#include <secitem.h>
+#include <secport.h>
+#include <secder.h>
+#include <certdb.h>
+#include <base64.h>
+#include <cert.h>
+#include <prerror.h>
+#include <keyhi.h>
+
+typedef struct
+{
+	enum
+	{
+		PW_NONE = 0,
+		PW_FROMFILE = 1,
+		PW_PLAINTEXT = 2,
+		PW_EXTERNAL = 3
+	} source;
+	char	   *data;
+}			secuPWData;
+
+/*
+ * Ensure that the colliding definitions match, else throw an error. In case
+ * NSPR has removed the definition for some reasone, make sure to put ours
+ * back again.
+ */
+#if defined(BITS_PER_BYTE)
+#if BITS_PER_BYTE != pg_BITS_PER_BYTE
+#error "incompatible byte widths between NSPR and postgres"
+#endif
+#else
+#define BITS_PER_BYTE pg_BITS_PER_BYTE
+#endif
+#undef pg_BITS_PER_BYTE
+
+#include "common/pg_nss.h"
+#include "lib/stringinfo.h"
+#include "libpq/libpq.h"
+#include "nodes/pg_list.h"
+#include "miscadmin.h"
+#include "storage/fd.h"
+#include "utils/guc.h"
+#include "utils/memutils.h"
+
+static PRDescIdentity pr_id;
+
+static PRIOMethods pr_iomethods;
+static NSSInitContext * nss_context = NULL;
+static SSLVersionRange desired_sslver;
+
+/*
+ * PR_ImportTCPSocket() is a private API, but very widely used, as it's the
+ * only way to make NSS use an already set up POSIX file descriptor rather
+ * than opening one itself. To quote the NSS documentation:
+ *
+ *		"In theory, code that uses PR_ImportTCPSocket may break when NSPR's
+ *		implementation changes. In practice, this is unlikely to happen because
+ *		NSPR's implementation has been stable for years and because of NSPR's
+ *		strong commitment to backward compatibility."
+ *
+ * https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSPR/Reference/PR_ImportTCPSocket
+ *
+ * The function is declared in <private/pprio.h>, but as it is a header marked
+ * private we declare it here rather than including it.
+ */
+NSPR_API(PRFileDesc *) PR_ImportTCPSocket(int);
+
+/* NSS IO layer callback overrides */
+static PRInt32 pg_ssl_read(PRFileDesc * fd, void *buf, PRInt32 amount,
+						   PRIntn flags, PRIntervalTime timeout);
+static PRInt32 pg_ssl_write(PRFileDesc * fd, const void *buf, PRInt32 amount,
+							PRIntn flags, PRIntervalTime timeout);
+/* Utility functions */
+static PRFileDesc * init_iolayer(Port *port, int loglevel);
+static uint16 ssl_protocol_version_to_nss(int v, const char *guc_name);
+
+static char *pg_SSLerrmessage(PRErrorCode errcode);
+static char *ssl_protocol_version_to_string(int v);
+static SECStatus pg_cert_auth_handler(void *arg, PRFileDesc * fd,
+									  PRBool checksig, PRBool isServer);
+static SECStatus pg_bad_cert_handler(void *arg, PRFileDesc * fd);
+
+/* ------------------------------------------------------------ */
+/*						 Public interface						*/
+/* ------------------------------------------------------------ */
+
+static char *
+ssl_passphrase_callback(PK11SlotInfo * slot, PRBool retry, void *arg)
+{
+	return pstrdup("");
+}
+
+/*
+ * be_tls_init
+ *			Initialize the nss TLS library in the postmaster
+ *
+ * The majority of the setup needs to happen in be_tls_open_server since the
+ * NSPR initialization must happen after the forking of the backend. We could
+ * potentially move some parts in under !isServerStart, but so far this is the
+ * separation chosen.
+ */
+int
+be_tls_init(bool isServerStart)
+{
+	SECStatus	status;
+	SSLVersionRange supported_sslver;
+
+	/*
+	 * Set up the connection cache for multi-processing application behavior.
+	 * If we are in ServerStart then we initialize the cache. If the server is
+	 * already started, we inherit the cache such that it can be used for
+	 * connections. Calling SSL_ConfigMPServerSIDCache sets an environment
+	 * variable which contains enough information for the forked child to know
+	 * how to access it.  Passing NULL to SSL_InheritMPServerSIDCache will
+	 * make the forked child look it up by the default name SSL_INHERITANCE,
+	 * if env vars aren't inherited then the contents of the variable can be
+	 * passed instead.
+	 */
+	if (isServerStart)
+	{
+		/*
+		 * SSLv2 and SSLv3 are disabled in this TLS backend, but when setting
+		 * up the required session cache for NSS we still must supply timeout
+		 * values for v2 and The minimum allowed value for both is 5 seconds,
+		 * so opt for that in both cases (the defaults being 100 seconds and
+		 * 24 hours).
+		 *
+		 * Passing NULL as the directory for the session cache will default to
+		 * using /tmp on UNIX and \\temp on Windows.  Deciding if we want to
+		 * keep closer control on this directory is left as a TODO.
+		 */
+		status = SSL_ConfigMPServerSIDCache(MaxConnections, 5, 5, NULL);
+		if (status != SECSuccess)
+			ereport(FATAL,
+					(errmsg("unable to set up TLS connection cache: %s",
+							pg_SSLerrmessage(PR_GetError()))));
+
+	}
+	else
+	{
+		status = SSL_InheritMPServerSIDCache(NULL);
+		if (status != SECSuccess)
+		{
+			ereport(LOG,
+					(errmsg("unable to connect to TLS connection cache: %s",
+							pg_SSLerrmessage(PR_GetError()))));
+			return -1;
+		}
+	}
+
+	if (!ssl_database || strlen(ssl_database) == 0)
+	{
+		ereport(isServerStart ? FATAL : LOG,
+				(errmsg("no certificate database specified")));
+		goto error;
+	}
+
+	/*
+	 * We check for the desired TLS version range here, even though we cannot
+	 * set it until be_open_server such that we can be compatible with how the
+	 * OpenSSL backend reports errors for incompatible range configurations.
+	 * Set either the default supported TLS version range, or the configured
+	 * range from ssl_min_protocol_version and ssl_max_protocol version. In
+	 * case the user hasn't defined the maximum allowed version we fall back
+	 * to the highest version TLS that the library supports.
+	 */
+	if (SSL_VersionRangeGetSupported(ssl_variant_stream, &supported_sslver) != SECSuccess)
+	{
+		ereport(isServerStart ? FATAL : LOG,
+				(errmsg("unable to get default protocol support from NSS")));
+		goto error;
+	}
+
+	/*
+	 * Set the fallback versions for the TLS protocol version range to a
+	 * combination of our minimal requirement and the library maximum.
+	 */
+	desired_sslver.min = SSL_LIBRARY_VERSION_TLS_1_0;
+	desired_sslver.max = supported_sslver.max;
+
+	if (ssl_min_protocol_version)
+	{
+		int			ver = ssl_protocol_version_to_nss(ssl_min_protocol_version,
+													  "ssl_min_protocol_version");
+
+		if (ver == -1)
+		{
+			ereport(isServerStart ? FATAL : LOG,
+					(errmsg("\"%s\" setting \"%s\" not supported by this build",
+							"ssl_min_protocol_version",
+							GetConfigOption("ssl_min_protocol_version",
+											false, false))));
+			goto error;
+		}
+
+		if (ver > 0)
+			desired_sslver.min = ver;
+	}
+
+	if (ssl_max_protocol_version)
+	{
+		int			ver = ssl_protocol_version_to_nss(ssl_max_protocol_version,
+													  "ssl_max_protocol_version");
+
+		if (ver == -1)
+		{
+			ereport(isServerStart ? FATAL : LOG,
+					(errmsg("\"%s\" setting \"%s\" not supported by this build",
+							"ssl_max_protocol_version",
+							GetConfigOption("ssl_max_protocol_version",
+											false, false))));
+			goto error;
+		}
+		if (ver > 0)
+			desired_sslver.max = ver;
+
+		if (ver < desired_sslver.min)
+		{
+			ereport(isServerStart ? FATAL : LOG,
+					(errmsg("could not set SSL protocol version range"),
+					 errdetail("\"%s\" cannot be higher than \"%s\"",
+							   "ssl_min_protocol_version",
+							   "ssl_max_protocol_version")));
+			goto error;
+		}
+	}
+
+	return 0;
+error:
+	return -1;
+}
+
+int
+be_tls_open_server(Port *port)
+{
+	SECStatus	status;
+	PRFileDesc *model;
+	PRFileDesc *pr_fd;
+	PRFileDesc *layer;
+	CERTCertificate *server_cert;
+	SECKEYPrivateKey *private_key;
+	CERTSignedCrl *crl;
+	SECItem		crlname;
+	secuPWData	pwdata = {PW_NONE, 0};	/* TODO: This is a bogus callback */
+	char	   *cert_database;
+	NSSInitParameters params;
+
+	/*
+	 * The NSPR documentation states that runtime initialization via PR_Init
+	 * is no longer required, as the first caller into NSPR will perform the
+	 * initialization implicitly. The documentation doesn't however clarify
+	 * from which version this is holds true, so let's perform the potentially
+	 * superfluous initialization anyways to avoid crashing on older versions
+	 * of NSPR, as there is no difference in overhead.  The NSS documentation
+	 * still states that PR_Init must be called in some way (implicitly or
+	 * explicitly).
+	 *
+	 * The below parameters are what the implicit initialization would've done
+	 * for us, and should work even for older versions where it might not be
+	 * done automatically. The last parameter, maxPTDs, is set to various
+	 * values in other codebases, but has been unused since NSPR 2.1 which was
+	 * released sometime in 1998.
+	 */
+	PR_Init(PR_USER_THREAD, PR_PRIORITY_NORMAL, 0 /* maxPTDs */ );
+
+	/*
+	 * The certificate path (configdir) must contain a valid NSS database. If
+	 * the certificate path isn't a valid directory, NSS will fall back on the
+	 * system certificate database. If the certificate path is a directory but
+	 * is empty then the initialization will fail. On the client side this can
+	 * be allowed for any sslmode but the verify-xxx ones.
+	 * https://bugzilla.redhat.com/show_bug.cgi?id=728562 For the server side
+	 * we wont allow this to fail however, as we require the certificate and
+	 * key to exist.
+	 *
+	 * The original design of NSS was for a single application to use a single
+	 * copy of it, initialized with NSS_Initialize() which isn't returning any
+	 * handle with which to refer to NSS. NSS initialization and shutdown are
+	 * global for the application, so a shutdown in another NSS enabled
+	 * library would cause NSS to be stopped for libpq as well.  The fix has
+	 * been to introduce NSS_InitContext which returns a context handle to
+	 * pass to NSS_ShutdownContext.  NSS_InitContext was introduced in NSS
+	 * 3.12, but the use of it is not very well documented.
+	 * https://bugzilla.redhat.com/show_bug.cgi?id=738456
+	 *
+	 * The InitParameters struct passed can be used to override internal
+	 * values in NSS, but the usage is not documented at all. When using
+	 * NSS_Init initializations, the values are instead set via PK11_Configure
+	 * calls so the PK11_Configure documentation can be used to glean some
+	 * details on these.
+	 *
+	 * https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS/PKCS11/Module_Specs
+	 */
+	memset(&params, '\0', sizeof(params));
+	params.length = sizeof(params);
+
+	if (!ssl_database || strlen(ssl_database) == 0)
+		ereport(FATAL,
+				(errmsg("no certificate database specified")));
+
+	cert_database = psprintf("sql:%s", ssl_database);
+	nss_context = NSS_InitContext(cert_database, "", "", "",
+								  &params,
+								  NSS_INIT_READONLY | NSS_INIT_PK11RELOAD);
+	pfree(cert_database);
+
+	if (!nss_context)
+		ereport(FATAL,
+				(errmsg("unable to read certificate database \"%s\": %s",
+						ssl_database, pg_SSLerrmessage(PR_GetError()))));
+
+	/*
+	 * Set the passphrase callback which will be used both to obtain the
+	 * passphrase from the user, as well as by NSS to obtain the phrase
+	 * repeatedly.
+	 *
+	 * TODO: Figure this out - do note that we are setting another password
+	 * callback below for cert/key as well. Need to make sense of all these.
+	 */
+	PK11_SetPasswordFunc(ssl_passphrase_callback);
+
+	/*
+	 * Import the already opened socket as we don't want to use NSPR functions
+	 * for opening the network socket due to how the PostgreSQL protocol works
+	 * with TLS connections. This function is not part of the NSPR public API,
+	 * see the comment at the top of the file for the rationale of still using
+	 * it.
+	 */
+	pr_fd = PR_ImportTCPSocket(port->sock);
+	if (!pr_fd)
+		ereport(ERROR,
+				(errmsg("unable to connect to socket")));
+
+	/*
+	 * Most of the documentation available, and implementations of, NSS/NSPR
+	 * use the PR_NewTCPSocket() function here, which has the drawback that it
+	 * can only create IPv4 sockets. Instead use PR_OpenTCPSocket() which
+	 * copes with IPv6 as well.
+	 */
+	model = PR_OpenTCPSocket(port->laddr.addr.ss_family);
+	if (!model)
+		ereport(ERROR,
+				(errmsg("unable to open socket")));
+
+	/*
+	 * Convert the NSPR socket to an SSL socket. Ensuring the success of this
+	 * operation is critical as NSS SSL_* functions may return SECSuccess on
+	 * the socket even though SSL hasn't been enabled, which introduce a risk
+	 * of silent downgrades.
+	 */
+	model = SSL_ImportFD(NULL, model);
+	if (!model)
+		ereport(ERROR,
+				(errmsg("unable to enable TLS on socket")));
+
+	/*
+	 * Configure basic settings for the connection over the SSL socket in
+	 * order to set it up as a server.
+	 */
+	if (SSL_OptionSet(model, SSL_SECURITY, PR_TRUE) != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to configure TLS connection")));
+
+	if (SSL_OptionSet(model, SSL_HANDSHAKE_AS_SERVER, PR_TRUE) != SECSuccess ||
+		SSL_OptionSet(model, SSL_HANDSHAKE_AS_CLIENT, PR_FALSE) != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to configure TLS connection as server")));
+
+	/*
+	 * SSLv2 is disabled by default, and SSLv3 will be excluded from the range
+	 * of allowed protocols further down. Since we really don't want these to
+	 * ever be enabled, let's use belts and suspenders and explicitly turn
+	 * them off as well.
+	 */
+	SSL_OptionSet(model, SSL_ENABLE_SSL2, PR_FALSE);
+	SSL_OptionSet(model, SSL_ENABLE_SSL3, PR_FALSE);
+
+#ifdef SSL_CBC_RANDOM_IV
+
+	/*
+	 * Enable protection against the BEAST attack in case the NSS server has
+	 * support for that. While SSLv3 is disabled, we may still allow TLSv1
+	 * which is affected. The option isn't documented as an SSL option, but as
+	 * an NSS environment variable.
+	 */
+	SSL_OptionSet(model, SSL_CBC_RANDOM_IV, PR_TRUE);
+#endif
+
+	/*
+	 * Configure the allowed cipher. If there are no user preferred suites,
+	 * set the domestic policy. TODO: while this code works, the set of
+	 * ciphers which can be set and still end up with a working socket is
+	 * woefully underdocumented for anything more recent than SSLv3 (the code
+	 * for TLS actually calls ssl3 functions under the hood for
+	 * SSL_CipherPrefSet), so it's unclear if this is helpful or not. Using
+	 * the policies works, but may be too coarsely grained.
+	 *
+	 * Another TODO: The SSL_ImplementedCiphers table returned with calling
+	 * SSL_GetImplementedCiphers is sorted in server preference order. Sorting
+	 * SSLCipherSuites according to the order of the ciphers therein could be
+	 * a way to implement ssl_prefer_server_ciphers - if we at all want to use
+	 * cipher selection for NSS like how we do it for OpenSSL that is.
+	 */
+
+	/*
+	 * If no ciphers are specified, we use the domestic policy
+	 */
+	if (!SSLCipherSuites || strlen(SSLCipherSuites) == 0)
+	{
+		status = NSS_SetDomesticPolicy();
+		if (status != SECSuccess)
+			ereport(ERROR,
+					(errmsg("unable to set cipher policy: %s",
+							pg_SSLerrmessage(PR_GetError()))));
+	}
+	else
+	{
+		char	   *ciphers,
+				   *c;
+
+		char	   *sep = ":;, ";
+		PRUint16	ciphercode;
+		const		PRUint16 *nss_ciphers;
+
+		/*
+		 * If the user has specified a set of preferred cipher suites we start
+		 * by turning off all the existing suites to avoid the risk of down-
+		 * grades to a weaker cipher than expected.
+		 */
+		nss_ciphers = SSL_GetImplementedCiphers();
+		for (int i = 0; i < SSL_GetNumImplementedCiphers(); i++)
+			SSL_CipherPrefSet(model, nss_ciphers[i], PR_FALSE);
+
+		ciphers = pstrdup(SSLCipherSuites);
+
+		for (c = strtok(ciphers, sep); c; c = strtok(NULL, sep))
+		{
+			ciphercode = pg_find_cipher(c);
+			if (ciphercode != INVALID_CIPHER)
+			{
+				status = SSL_CipherPrefSet(model, ciphercode, PR_TRUE);
+				if (status != SECSuccess)
+					ereport(ERROR,
+							(errmsg("invalid cipher-suite specified: %s", c)));
+			}
+		}
+
+		pfree(ciphers);
+	}
+
+	if (SSL_VersionRangeSet(model, &desired_sslver) != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to set requested SSL protocol version range")));
+
+	/*
+	 * Set up the custom IO layer.
+	 */
+	layer = init_iolayer(port, ERROR);
+	if (!layer)
+		goto error;
+
+	/* Store the Port as private data available in callbacks */
+	layer->secret = (void *) port;
+
+	if (PR_PushIOLayer(pr_fd, PR_TOP_IO_LAYER, layer) != PR_SUCCESS)
+	{
+		PR_Close(layer);
+		ereport(ERROR,
+				(errmsg("unable to push IO layer")));
+	}
+
+	/* TODO: set the postgres password callback param as callback function */
+	server_cert = PK11_FindCertFromNickname(ssl_cert_file, &pwdata /* password callback */ );
+	if (!server_cert)
+		ereport(ERROR,
+				(errmsg("unable to find certificate for \"%s\": %s",
+						ssl_cert_file, pg_SSLerrmessage(PR_GetError()))));
+
+	/* TODO: set the postgres password callback param as callback function */
+	private_key = PK11_FindKeyByAnyCert(server_cert, &pwdata /* password callback */ );
+	if (!private_key)
+		ereport(ERROR,
+				(errmsg("unable to find private key for \"%s\": %s",
+						ssl_cert_file, pg_SSLerrmessage(PR_GetError()))));
+
+	/*
+	 * NSS doesn't use CRL files on disk, so we use the ssl_crl_file guc to
+	 * contain the CRL nickname for the current server certificate in the NSS
+	 * certificate database. The main difference from the OpenSSL backend is
+	 * that NSS will use the CRL regardless, but being able to make sure the
+	 * CRL is loaded seems like a good feature.
+	 */
+	if (ssl_crl_file[0])
+	{
+		SECITEM_CopyItem(NULL, &crlname, &server_cert->derSubject);
+		crl = SEC_FindCrlByName(CERT_GetDefaultCertDB(), &crlname, SEC_CRL_TYPE);
+		if (!crl)
+			ereport(ERROR,
+					(errmsg("specified CRL not found in database")));
+		SEC_DestroyCrl(crl);
+	}
+
+	/*
+	 * Finally we must configure the socket for being a server by setting the
+	 * certificate and key.
+	 */
+	status = SSL_ConfigSecureServer(model, server_cert, private_key, kt_rsa);
+	if (status != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to configure secure server: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+	status = SSL_ConfigServerCert(model, server_cert, private_key, NULL, 0);
+	if (status != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to configure server for TLS server connections: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+
+	ssl_loaded_verify_locations = true;
+
+	/*
+	 * At this point, we no longer have use for the certificate and private
+	 * key as they have been copied into the context by NSS. Destroy our
+	 * copies explicitly to clean out the memory as best we can.
+	 */
+	CERT_DestroyCertificate(server_cert);
+	SECKEY_DestroyPrivateKey(private_key);
+
+	status = SSL_AuthCertificateHook(model, pg_cert_auth_handler, (void *) port);
+	if (status != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to install authcert hook: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+	SSL_BadCertHook(model, pg_bad_cert_handler, (void *) port);
+	SSL_OptionSet(model, SSL_REQUEST_CERTIFICATE, PR_TRUE);
+	SSL_OptionSet(model, SSL_REQUIRE_CERTIFICATE, PR_FALSE);
+
+	port->pr_fd = SSL_ImportFD(model, pr_fd);
+	if (!port->pr_fd)
+		ereport(ERROR,
+				(errmsg("unable to initialize")));
+
+	PR_Close(model);
+
+	/*
+	 * Force a handshake on the next I/O request, the second parameter means
+	 * that we are a server, PR_FALSE would indicate being a client. NSPR
+	 * requires us to call SSL_ResetHandshake since we imported an already
+	 * established socket.
+	 */
+	status = SSL_ResetHandshake(port->pr_fd, PR_TRUE);
+	if (status != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to initiate handshake: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+	status = SSL_ForceHandshake(port->pr_fd);
+	if (status != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to handshake: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+
+	port->ssl_in_use = true;
+	return 0;
+
+error:
+	return 1;
+}
+
+ssize_t
+be_tls_read(Port *port, void *ptr, size_t len, int *waitfor)
+{
+	ssize_t		n_read;
+	PRErrorCode err;
+
+	n_read = PR_Read(port->pr_fd, ptr, len);
+
+	if (n_read < 0)
+	{
+		err = PR_GetError();
+
+		/* XXX: This logic seems potentially bogus? */
+		if (err == PR_WOULD_BLOCK_ERROR)
+			*waitfor = WL_SOCKET_READABLE;
+		else
+			*waitfor = WL_SOCKET_WRITEABLE;
+	}
+
+	return n_read;
+}
+
+ssize_t
+be_tls_write(Port *port, void *ptr, size_t len, int *waitfor)
+{
+	ssize_t		n_write;
+	PRErrorCode err;
+
+	n_write = PR_Send(port->pr_fd, ptr, len, 0, PR_INTERVAL_NO_WAIT);
+
+	if (n_write < 0)
+	{
+		err = PR_GetError();
+
+		if (err == PR_WOULD_BLOCK_ERROR)
+			*waitfor = WL_SOCKET_WRITEABLE;
+		else
+			*waitfor = WL_SOCKET_READABLE;
+	}
+
+	return n_write;
+}
+
+void
+be_tls_close(Port *port)
+{
+	if (!port)
+		return;
+
+	if (port->peer_cn)
+	{
+		SSL_InvalidateSession(port->pr_fd);
+		pfree(port->peer_cn);
+		port->peer_cn = NULL;
+	}
+
+	PR_Close(port->pr_fd);
+	port->pr_fd = NULL;
+	port->ssl_in_use = false;
+
+	if (nss_context)
+	{
+		NSS_ShutdownContext(nss_context);
+		nss_context = NULL;
+	}
+}
+
+void
+be_tls_destroy(void)
+{
+	/*
+	 * It reads a bit odd to clear a session cache when we are destroying the
+	 * context altogether, but if the session cache isn't cleared before
+	 * shutting down the context it will fail with SEC_ERROR_BUSY.
+	 */
+	SSL_ClearSessionCache();
+}
+
+int
+be_tls_get_cipher_bits(Port *port)
+{
+	SECStatus	status;
+	SSLChannelInfo channel;
+	SSLCipherSuiteInfo suite;
+
+	status = SSL_GetChannelInfo(port->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+		goto error;
+
+	status = SSL_GetCipherSuiteInfo(channel.cipherSuite, &suite, sizeof(suite));
+	if (status != SECSuccess)
+		goto error;
+
+	return suite.effectiveKeyBits;
+
+error:
+	ereport(WARNING,
+			(errmsg("unable to extract TLS session information: %s",
+					pg_SSLerrmessage(PR_GetError()))));
+	return 0;
+}
+
+/*
+ * be_tls_get_compression
+ *
+ * NSS disabled support for TLS compression in version 3.33 and removed the
+ * code in a subsequent release. The API for retrieving information about
+ * compression as well as enabling it is kept for backwards compatibility, but
+ * we don't need to consult it since it was only available for SSLv3 which we
+ * don't support.
+ *
+ * https://bugzilla.mozilla.org/show_bug.cgi?id=1409587
+ */
+bool
+be_tls_get_compression(Port *port)
+{
+	return false;
+}
+
+/*
+ * be_tls_get_version
+ *
+ * Returns the protocol version used for the current connection, or NULL in
+ * case of errors.
+ */
+const char *
+be_tls_get_version(Port *port)
+{
+	SECStatus	status;
+	SSLChannelInfo channel;
+
+	status = SSL_GetChannelInfo(port->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+	{
+		ereport(WARNING,
+				(errmsg("unable to extract TLS session information: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+		return NULL;
+	}
+
+	return ssl_protocol_version_to_string(channel.protocolVersion);
+}
+
+const char *
+be_tls_get_cipher(Port *port)
+{
+	SECStatus	status;
+	SSLChannelInfo channel;
+	SSLCipherSuiteInfo suite;
+
+	status = SSL_GetChannelInfo(port->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+		goto error;
+
+	status = SSL_GetCipherSuiteInfo(channel.cipherSuite, &suite, sizeof(suite));
+	if (status != SECSuccess)
+		goto error;
+
+	return suite.cipherSuiteName;
+
+error:
+	ereport(WARNING,
+			(errmsg("unable to extract TLS session information: %s",
+					pg_SSLerrmessage(PR_GetError()))));
+	return NULL;
+}
+
+void
+be_tls_get_peer_subject_name(Port *port, char *ptr, size_t len)
+{
+	CERTCertificate *certificate;
+
+	certificate = SSL_PeerCertificate(port->pr_fd);
+	if (certificate)
+		strlcpy(ptr, CERT_NameToAscii(&certificate->subject), len);
+	else
+		ptr[0] = '\0';
+}
+
+void
+be_tls_get_peer_issuer_name(Port *port, char *ptr, size_t len)
+{
+	CERTCertificate *certificate;
+
+	certificate = SSL_PeerCertificate(port->pr_fd);
+	if (certificate)
+		strlcpy(ptr, CERT_NameToAscii(&certificate->issuer), len);
+	else
+		ptr[0] = '\0';
+}
+
+void
+be_tls_get_peer_serial(Port *port, char *ptr, size_t len)
+{
+	CERTCertificate *certificate;
+
+	certificate = SSL_PeerCertificate(port->pr_fd);
+	if (certificate)
+		snprintf(ptr, len, "%li", DER_GetInteger(&(certificate->serialNumber)));
+	else
+		ptr[0] = '\0';
+}
+
+static SECStatus
+pg_bad_cert_handler(void *arg, PRFileDesc * fd)
+{
+	Port	   *port = (Port *) arg;
+
+	port->peer_cert_valid = false;
+	return SECFailure;
+}
+
+static SECStatus
+pg_cert_auth_handler(void *arg, PRFileDesc * fd, PRBool checksig, PRBool isServer)
+{
+	SECStatus	status;
+	Port	   *port = (Port *) arg;
+	CERTCertificate *cert;
+	char	   *peer_cn;
+	int			len;
+
+	status = SSL_AuthCertificate(CERT_GetDefaultCertDB(), port->pr_fd, checksig, PR_TRUE);
+	if (status == SECSuccess)
+	{
+		cert = SSL_PeerCertificate(port->pr_fd);
+		len = strlen(cert->subjectName);
+		peer_cn = MemoryContextAllocZero(TopMemoryContext, len + 1);
+		if (strncmp(cert->subjectName, "CN=", 3) == 0)
+			strlcpy(peer_cn, cert->subjectName + strlen("CN="), len + 1);
+		else
+			strlcpy(peer_cn, cert->subjectName, len + 1);
+		CERT_DestroyCertificate(cert);
+
+		port->peer_cn = peer_cn;
+		port->peer_cert_valid = true;
+	}
+
+	return status;
+}
+
+/* ------------------------------------------------------------ */
+/*						Internal functions						*/
+/* ------------------------------------------------------------ */
+
+static PRInt32
+pg_ssl_read(PRFileDesc * fd, void *buf, PRInt32 amount, PRIntn flags,
+			PRIntervalTime timeout)
+{
+	PRRecvFN	read_fn;
+	PRInt32		n_read;
+
+	read_fn = fd->lower->methods->recv;
+	n_read = read_fn(fd->lower, buf, amount, flags, timeout);
+
+	return n_read;
+}
+
+static PRInt32
+pg_ssl_write(PRFileDesc * fd, const void *buf, PRInt32 amount, PRIntn flags,
+			 PRIntervalTime timeout)
+{
+	PRSendFN	send_fn;
+	PRInt32		n_write;
+
+	send_fn = fd->lower->methods->send;
+	n_write = send_fn(fd->lower, buf, amount, flags, timeout);
+
+	return n_write;
+}
+
+static PRFileDesc *
+init_iolayer(Port *port, int loglevel)
+{
+	const		PRIOMethods *default_methods;
+	PRFileDesc *layer;
+
+	/*
+	 * Start by initializing our layer with all the default methods so that we
+	 * can selectively override the ones we want while still ensuring that we
+	 * have a complete layer specification.
+	 */
+	default_methods = PR_GetDefaultIOMethods();
+	memcpy(&pr_iomethods, default_methods, sizeof(PRIOMethods));
+
+	pr_iomethods.recv = pg_ssl_read;
+	pr_iomethods.send = pg_ssl_write;
+
+	/*
+	 * Each IO layer must be identified by a unique name, where uniqueness is
+	 * per connection. Each connection in a postgres cluster can generate the
+	 * identity from the same string as they will create their IO layers on
+	 * different sockets. Only one layer per socket can have the same name.
+	 */
+	pr_id = PR_GetUniqueIdentity("PostgreSQL");
+	if (pr_id == PR_INVALID_IO_LAYER)
+	{
+		ereport(loglevel,
+				(errmsg("out of memory when setting up TLS connection")));
+		return NULL;
+	}
+
+	/*
+	 * Create the actual IO layer as a stub such that it can be pushed onto
+	 * the layer stack. The step via a stub is required as we define custom
+	 * callbacks.
+	 */
+	layer = PR_CreateIOLayerStub(pr_id, &pr_iomethods);
+	if (!layer)
+	{
+		ereport(loglevel,
+				(errmsg("unable to create NSS I/O layer")));
+		return NULL;
+	}
+
+	return layer;
+}
+
+static char *
+ssl_protocol_version_to_string(int v)
+{
+	switch (v)
+	{
+			/* SSL v2 and v3 are not supported */
+		case SSL_LIBRARY_VERSION_2:
+		case SSL_LIBRARY_VERSION_3_0:
+			Assert(false);
+			break;
+
+		case SSL_LIBRARY_VERSION_TLS_1_0:
+			return pstrdup("TLSv1.0");
+		case SSL_LIBRARY_VERSION_TLS_1_1:
+			return pstrdup("TLSv1.1");
+		case SSL_LIBRARY_VERSION_TLS_1_2:
+			return pstrdup("TLSv1.2");
+		case SSL_LIBRARY_VERSION_TLS_1_3:
+			return pstrdup("TLSv1.3");
+	}
+
+	return pstrdup("unknown");
+}
+
+
+/*
+ * ssl_protocol_version_to_nss
+ *			Translate PostgreSQL TLS version to NSS version
+ *
+ * Returns zero in case the requested TLS version is undefined (PG_ANY) and
+ * should be set by the caller, or -1 on failure.
+ */
+static uint16
+ssl_protocol_version_to_nss(int v, const char *guc_name)
+{
+	switch (v)
+	{
+			/*
+			 * There is no SSL_LIBRARY_ macro defined in NSS with the value
+			 * zero, so we use this to signal the caller that the highest
+			 * useful version should be set on the connection.
+			 */
+		case PG_TLS_ANY:
+			return 0;
+
+			/*
+			 * No guard is required here as there are no versions of NSS
+			 * without support for TLS1.
+			 */
+		case PG_TLS1_VERSION:
+			return SSL_LIBRARY_VERSION_TLS_1_0;
+		case PG_TLS1_1_VERSION:
+#ifdef SSL_LIBRARY_VERSION_TLS_1_1
+			return SSL_LIBRARY_VERSION_TLS_1_1;
+#else
+			break;
+#endif
+		case PG_TLS1_2_VERSION:
+#ifdef SSL_LIBRARY_VERSION_TLS_1_2
+			return SSL_LIBRARY_VERSION_TLS_1_2;
+#else
+			break;
+#endif
+		case PG_TLS1_3_VERSION:
+#ifdef SSL_LIBRARY_VERSION_TLS_1_3
+			return SSL_LIBRARY_VERSION_TLS_1_3;
+#else
+			break;
+#endif
+		default:
+			break;
+	}
+
+	return -1;
+}
+
+/*
+ * pg_SSLerrmessage
+ *		Create and return a human readable error message given
+ *		the specified error code
+ *
+ * PR_ErrorToName only converts the enum identifier of the error to string,
+ * but that can be quite useful for debugging (and in case PR_ErrorToString is
+ * unable to render a message then we at least have something).
+ */
+static char *
+pg_SSLerrmessage(PRErrorCode errcode)
+{
+	char		error[128];
+	int			ret;
+
+	/* TODO: this should perhaps use a StringInfo instead.. */
+	ret = pg_snprintf(error, sizeof(error), "%s (%s)",
+					  PR_ErrorToString(errcode, PR_LANGUAGE_I_DEFAULT),
+					  PR_ErrorToName(errcode));
+	if (ret)
+		return pstrdup(error);
+
+	return pstrdup(_("unknown TLS error"));
+}
diff --git a/src/backend/libpq/be-secure-openssl.c b/src/backend/libpq/be-secure-openssl.c
index 8b21ff4065..5962cffc0c 100644
--- a/src/backend/libpq/be-secure-openssl.c
+++ b/src/backend/libpq/be-secure-openssl.c
@@ -1298,15 +1298,28 @@ X509_NAME_to_cstring(X509_NAME *name)
 	char	   *dp;
 	char	   *result;
 
+	if (membuf == NULL)
+		ereport(ERROR,
+				(errcode(ERRCODE_OUT_OF_MEMORY),
+				 errmsg("failed to create BIO")));
+
 	(void) BIO_set_close(membuf, BIO_CLOSE);
 	for (i = 0; i < count; i++)
 	{
 		e = X509_NAME_get_entry(name, i);
 		nid = OBJ_obj2nid(X509_NAME_ENTRY_get_object(e));
+		if (nid == NID_undef)
+			ereport(ERROR,
+					(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
+					 errmsg("could not get NID for ASN1_OBJECT object")));
 		v = X509_NAME_ENTRY_get_data(e);
 		field_name = OBJ_nid2sn(nid);
 		if (!field_name)
 			field_name = OBJ_nid2ln(nid);
+		if (field_name == NULL)
+			ereport(ERROR,
+					(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
+					 errmsg("could not convert NID %d to an ASN1_OBJECT structure", nid)));
 		BIO_printf(membuf, "/%s=", field_name);
 		ASN1_STRING_print_ex(membuf, v,
 							 ((ASN1_STRFLGS_RFC2253 & ~ASN1_STRFLGS_ESC_MSB)
@@ -1322,7 +1335,8 @@ X509_NAME_to_cstring(X509_NAME *name)
 	result = pstrdup(dp);
 	if (dp != sp)
 		pfree(dp);
-	BIO_free(membuf);
+	if (BIO_free(membuf) != 1)
+		elog(ERROR, "could not free OpenSSL BIO structure");
 
 	return result;
 }
diff --git a/src/backend/libpq/be-secure.c b/src/backend/libpq/be-secure.c
index 2ae507a902..f39977b80c 100644
--- a/src/backend/libpq/be-secure.c
+++ b/src/backend/libpq/be-secure.c
@@ -49,6 +49,9 @@ bool		ssl_passphrase_command_supports_reload;
 #ifdef USE_SSL
 bool		ssl_loaded_verify_locations = false;
 #endif
+#ifdef USE_NSS
+char	   *ssl_database;
+#endif
 
 /* GUC variable controlling SSL cipher list */
 char	   *SSLCipherSuites = NULL;
diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c
index 596bcb7b84..ce6200c851 100644
--- a/src/backend/utils/misc/guc.c
+++ b/src/backend/utils/misc/guc.c
@@ -4262,7 +4262,11 @@ static struct config_string ConfigureNamesString[] =
 		},
 		&ssl_library,
 #ifdef USE_SSL
+#if defined(USE_OPENSSL)
 		"OpenSSL",
+#elif defined(USE_NSS)
+		"NSS",
+#endif
 #else
 		"",
 #endif
@@ -4320,6 +4324,18 @@ static struct config_string ConfigureNamesString[] =
 		check_canonical_path, assign_pgstat_temp_directory, NULL
 	},
 
+#ifdef USE_NSS
+	{
+		{"ssl_database", PGC_SIGHUP, CONN_AUTH_SSL,
+			gettext_noop("Location of the NSS certificate database."),
+			NULL
+		},
+		&ssl_database,
+		"",
+		NULL, NULL, NULL
+	},
+#endif
+
 	{
 		{"synchronous_standby_names", PGC_SIGHUP, REPLICATION_PRIMARY,
 			gettext_noop("Number of synchronous standbys and list of names of potential synchronous ones."),
@@ -4348,8 +4364,10 @@ static struct config_string ConfigureNamesString[] =
 			GUC_SUPERUSER_ONLY
 		},
 		&SSLCipherSuites,
-#ifdef USE_OPENSSL
+#if defined(USE_OPENSSL)
 		"HIGH:MEDIUM:+3DES:!aNULL",
+#elif defined (USE_NSS)
+		"",
 #else
 		"none",
 #endif
diff --git a/src/include/common/pg_nss.h b/src/include/common/pg_nss.h
new file mode 100644
index 0000000000..74298c8bb1
--- /dev/null
+++ b/src/include/common/pg_nss.h
@@ -0,0 +1,141 @@
+/*-------------------------------------------------------------------------
+ *
+ * pg_nss.h
+ *	  Support for NSS as a TLS backend
+ *
+ * These definitions are used by both frontend and backend code.
+ *
+ * Copyright (c) 2020, PostgreSQL Global Development Group
+ *
+ * IDENTIFICATION
+ *        src/include/common/pg_nss.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef PG_NSS_H
+#define PG_NSS_H
+
+#ifdef USE_NSS
+
+#include <sslproto.h>
+
+PRUint16	pg_find_cipher(char *name);
+
+typedef struct
+{
+	const char *name;
+	PRUint16	number;
+}			NSSCiphers;
+
+#define INVALID_CIPHER	0xFFFF
+
+/*
+ * This list is a partial copy of the ciphers in NSS files lib/ssl/sslproto.h
+ * in order to provide a human readable version of the ciphers. It would be
+ * nice to not have to have this, but NSS doesn't provide any API addressing
+ * the ciphers by name. TODO: do we want more of the ciphers, or perhaps less?
+ */
+static const NSSCiphers NSS_CipherList[] = {
+
+	{"TLS_NULL_WITH_NULL_NULL", TLS_NULL_WITH_NULL_NULL},
+
+	{"TLS_RSA_WITH_NULL_MD5", TLS_RSA_WITH_NULL_MD5},
+	{"TLS_RSA_WITH_NULL_SHA", TLS_RSA_WITH_NULL_SHA},
+	{"TLS_RSA_WITH_RC4_128_MD5", TLS_RSA_WITH_RC4_128_MD5},
+	{"TLS_RSA_WITH_RC4_128_SHA", TLS_RSA_WITH_RC4_128_SHA},
+	{"TLS_RSA_WITH_IDEA_CBC_SHA", TLS_RSA_WITH_IDEA_CBC_SHA},
+	{"TLS_RSA_WITH_DES_CBC_SHA", TLS_RSA_WITH_DES_CBC_SHA},
+	{"TLS_RSA_WITH_3DES_EDE_CBC_SHA", TLS_RSA_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_DH_DSS_WITH_DES_CBC_SHA", TLS_DH_DSS_WITH_DES_CBC_SHA},
+	{"TLS_DH_DSS_WITH_3DES_EDE_CBC_SHA", TLS_DH_DSS_WITH_3DES_EDE_CBC_SHA},
+	{"TLS_DH_RSA_WITH_DES_CBC_SHA", TLS_DH_RSA_WITH_DES_CBC_SHA},
+	{"TLS_DH_RSA_WITH_3DES_EDE_CBC_SHA", TLS_DH_RSA_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_DHE_DSS_WITH_DES_CBC_SHA", TLS_DHE_DSS_WITH_DES_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_3DES_EDE_CBC_SHA", TLS_DHE_DSS_WITH_3DES_EDE_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_DES_CBC_SHA", TLS_DHE_RSA_WITH_DES_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA", TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_DH_anon_WITH_RC4_128_MD5", TLS_DH_anon_WITH_RC4_128_MD5},
+	{"TLS_DH_anon_WITH_DES_CBC_SHA", TLS_DH_anon_WITH_DES_CBC_SHA},
+	{"TLS_DH_anon_WITH_3DES_EDE_CBC_SHA", TLS_DH_anon_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_RSA_WITH_AES_128_CBC_SHA", TLS_RSA_WITH_AES_128_CBC_SHA},
+	{"TLS_DH_DSS_WITH_AES_128_CBC_SHA", TLS_DH_DSS_WITH_AES_128_CBC_SHA},
+	{"TLS_DH_RSA_WITH_AES_128_CBC_SHA", TLS_DH_RSA_WITH_AES_128_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_AES_128_CBC_SHA", TLS_DHE_DSS_WITH_AES_128_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_AES_128_CBC_SHA", TLS_DHE_RSA_WITH_AES_128_CBC_SHA},
+	{"TLS_DH_anon_WITH_AES_128_CBC_SHA", TLS_DH_anon_WITH_AES_128_CBC_SHA},
+
+	{"TLS_RSA_WITH_AES_256_CBC_SHA", TLS_RSA_WITH_AES_256_CBC_SHA},
+	{"TLS_DH_DSS_WITH_AES_256_CBC_SHA", TLS_DH_DSS_WITH_AES_256_CBC_SHA},
+	{"TLS_DH_RSA_WITH_AES_256_CBC_SHA", TLS_DH_RSA_WITH_AES_256_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_AES_256_CBC_SHA", TLS_DHE_DSS_WITH_AES_256_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_AES_256_CBC_SHA", TLS_DHE_RSA_WITH_AES_256_CBC_SHA},
+	{"TLS_DH_anon_WITH_AES_256_CBC_SHA", TLS_DH_anon_WITH_AES_256_CBC_SHA},
+	{"TLS_RSA_WITH_NULL_SHA256", TLS_RSA_WITH_NULL_SHA256},
+	{"TLS_RSA_WITH_AES_128_CBC_SHA256", TLS_RSA_WITH_AES_128_CBC_SHA256},
+	{"TLS_RSA_WITH_AES_256_CBC_SHA256", TLS_RSA_WITH_AES_256_CBC_SHA256},
+
+	{"TLS_DHE_DSS_WITH_AES_128_CBC_SHA256", TLS_DHE_DSS_WITH_AES_128_CBC_SHA256},
+	{"TLS_RSA_WITH_CAMELLIA_128_CBC_SHA", TLS_RSA_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DH_DSS_WITH_CAMELLIA_128_CBC_SHA", TLS_DH_DSS_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DH_RSA_WITH_CAMELLIA_128_CBC_SHA", TLS_DH_RSA_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_CAMELLIA_128_CBC_SHA", TLS_DHE_DSS_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA", TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DH_anon_WITH_CAMELLIA_128_CBC_SHA", TLS_DH_anon_WITH_CAMELLIA_128_CBC_SHA},
+
+	{"TLS_DHE_DSS_WITH_RC4_128_SHA", TLS_DHE_DSS_WITH_RC4_128_SHA},
+	{"TLS_DHE_RSA_WITH_AES_128_CBC_SHA256", TLS_DHE_RSA_WITH_AES_128_CBC_SHA256},
+	{"TLS_DHE_DSS_WITH_AES_256_CBC_SHA256", TLS_DHE_DSS_WITH_AES_256_CBC_SHA256},
+	{"TLS_DHE_RSA_WITH_AES_256_CBC_SHA256", TLS_DHE_RSA_WITH_AES_256_CBC_SHA256},
+
+	{"TLS_RSA_WITH_CAMELLIA_256_CBC_SHA", TLS_RSA_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DH_DSS_WITH_CAMELLIA_256_CBC_SHA", TLS_DH_DSS_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DH_RSA_WITH_CAMELLIA_256_CBC_SHA", TLS_DH_RSA_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_CAMELLIA_256_CBC_SHA", TLS_DHE_DSS_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA", TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DH_anon_WITH_CAMELLIA_256_CBC_SHA", TLS_DH_anon_WITH_CAMELLIA_256_CBC_SHA},
+
+	{"TLS_RSA_WITH_SEED_CBC_SHA", TLS_RSA_WITH_SEED_CBC_SHA},
+
+	{"TLS_RSA_WITH_AES_128_GCM_SHA256", TLS_RSA_WITH_AES_128_GCM_SHA256},
+	{"TLS_RSA_WITH_AES_256_GCM_SHA384", TLS_RSA_WITH_AES_256_GCM_SHA384},
+	{"TLS_DHE_RSA_WITH_AES_128_GCM_SHA256", TLS_DHE_RSA_WITH_AES_128_GCM_SHA256},
+	{"TLS_DHE_RSA_WITH_AES_256_GCM_SHA384", TLS_DHE_RSA_WITH_AES_256_GCM_SHA384},
+	{"TLS_DHE_DSS_WITH_AES_128_GCM_SHA256", TLS_DHE_DSS_WITH_AES_128_GCM_SHA256},
+	{"TLS_DHE_DSS_WITH_AES_256_GCM_SHA384", TLS_DHE_DSS_WITH_AES_256_GCM_SHA384},
+
+	{"TLS_AES_128_GCM_SHA256", TLS_AES_128_GCM_SHA256},
+	{"TLS_AES_256_GCM_SHA384", TLS_AES_256_GCM_SHA384},
+	{"TLS_CHACHA20_POLY1305_SHA256", TLS_CHACHA20_POLY1305_SHA256},
+	{NULL, 0}
+};
+
+/*
+ * pg_find_cipher
+ *			Translate an NSS ciphername to the cipher code
+ *
+ * Searches the configured ciphers for the corresponding cipher code to the
+ * name. Search is performed case insensitive.
+ */
+PRUint16
+pg_find_cipher(char *name)
+{
+	const		NSSCiphers *cipher_list = NSS_CipherList;
+
+	while (cipher_list->name)
+	{
+		if (pg_strcasecmp(cipher_list->name, name) == 0)
+			return cipher_list->number;
+
+		cipher_list++;
+	}
+
+	return 0xFFFF;
+}
+
+#endif							/* USE_NSS */
+
+#endif							/* PG_NSS_H */
diff --git a/src/include/libpq/libpq-be.h b/src/include/libpq/libpq-be.h
index 0a23281ad5..f11ddd6b2e 100644
--- a/src/include/libpq/libpq-be.h
+++ b/src/include/libpq/libpq-be.h
@@ -192,13 +192,18 @@ typedef struct Port
 	bool		peer_cert_valid;
 
 	/*
-	 * OpenSSL structures. (Keep these last so that the locations of other
-	 * fields are the same whether or not you build with OpenSSL.)
+	 * SSL backend specific structures. (Keep these last so that the locations
+	 * of other fields are the same whether or not you build with SSL
+	 * enabled.)
 	 */
 #ifdef USE_OPENSSL
 	SSL		   *ssl;
 	X509	   *peer;
 #endif
+
+#ifdef USE_NSS
+	void	   *pr_fd;
+#endif
 } Port;
 
 #ifdef USE_SSL
diff --git a/src/include/libpq/libpq.h b/src/include/libpq/libpq.h
index b1152475ac..298d87ecae 100644
--- a/src/include/libpq/libpq.h
+++ b/src/include/libpq/libpq.h
@@ -88,6 +88,9 @@ extern PGDLLIMPORT bool ssl_passphrase_command_supports_reload;
 #ifdef USE_SSL
 extern bool ssl_loaded_verify_locations;
 #endif
+#ifdef USE_NSS
+extern char *ssl_database;
+#endif
 
 extern int	secure_initialize(bool isServerStart);
 extern bool secure_loaded_verify_locations(void);
diff --git a/src/include/pg_config.h.in b/src/include/pg_config.h.in
index fb270df678..31f808398c 100644
--- a/src/include/pg_config.h.in
+++ b/src/include/pg_config.h.in
@@ -893,6 +893,9 @@
 /* Define to 1 to build with PAM support. (--with-pam) */
 #undef USE_PAM
 
+/* Define to build with NSS support (--with-nss) */
+#undef USE_NSS
+
 /* Define to 1 to use software CRC-32C implementation (slicing-by-8). */
 #undef USE_SLICING_BY_8_CRC32C
 
diff --git a/src/include/pg_config_manual.h b/src/include/pg_config_manual.h
index 705dc69c06..c28b84126d 100644
--- a/src/include/pg_config_manual.h
+++ b/src/include/pg_config_manual.h
@@ -176,10 +176,9 @@
 
 /*
  * USE_SSL code should be compiled only when compiling with an SSL
- * implementation.  (Currently, only OpenSSL is supported, but we might add
- * more implementations in the future.)
+ * implementation.
  */
-#ifdef USE_OPENSSL
+#if defined(USE_OPENSSL) || defined(USE_NSS)
 #define USE_SSL
 #endif
 
diff --git a/src/interfaces/libpq/Makefile b/src/interfaces/libpq/Makefile
index 4ac5f4b340..ef5f105afc 100644
--- a/src/interfaces/libpq/Makefile
+++ b/src/interfaces/libpq/Makefile
@@ -57,6 +57,10 @@ OBJS += \
 	fe-secure-gssapi.o
 endif
 
+ifeq ($(with_nss), yes)
+OBJS += fe-secure-nss.o
+endif
+
 ifeq ($(PORTNAME), cygwin)
 override shlib = cyg$(NAME)$(DLSUFFIX)
 endif
diff --git a/src/interfaces/libpq/fe-connect.c b/src/interfaces/libpq/fe-connect.c
index 724076a310..0acf521624 100644
--- a/src/interfaces/libpq/fe-connect.c
+++ b/src/interfaces/libpq/fe-connect.c
@@ -354,6 +354,10 @@ static const internalPQconninfoOption PQconninfoOptions[] = {
 		"Target-Session-Attrs", "", 11, /* sizeof("read-write") = 11 */
 	offsetof(struct pg_conn, target_session_attrs)},
 
+	{"cert_database", NULL, NULL, NULL,
+		"CertificateDatabase", "", 64,
+	offsetof(struct pg_conn, cert_database)},
+
 	/* Terminating entry --- MUST BE LAST */
 	{NULL, NULL, NULL, NULL,
 	NULL, NULL, 0}
diff --git a/src/interfaces/libpq/fe-secure-nss.c b/src/interfaces/libpq/fe-secure-nss.c
new file mode 100644
index 0000000000..778393fc3b
--- /dev/null
+++ b/src/interfaces/libpq/fe-secure-nss.c
@@ -0,0 +1,984 @@
+/*-------------------------------------------------------------------------
+ *
+ * fe-secure-nss.c
+ *	  functions for supporting NSS as a TLS backend for frontend libpq
+ *
+ * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ *	  src/interfaces/libpq/fe-secure-nss.c
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#include "postgres_fe.h"
+
+#include "libpq-fe.h"
+#include "fe-auth.h"
+#include "libpq-int.h"
+
+/*
+ * BITS_PER_BYTE is also defined in the NSPR header fils, so we need to undef
+ * our version to avoid compiler warnings on redefinition.
+ */
+#define pg_BITS_PER_BYTE BITS_PER_BYTE
+#undef BITS_PER_BYTE
+
+/*
+ * The nspr/obsolete/protypes.h NSPR header typedefs uint64 and int64 with
+ * colliding definitions from ours, causing a much expected compiler error.
+ * The definitions are however not actually used in NSPR at all, and are only
+ * intended for what seems to be backwards compatibility for apps written
+ * against old versions of NSPR.  The following comment is in the referenced
+ * file, and was added in 1998:
+ *
+ *		This section typedefs the old 'native' types to the new PR<type>s.
+ *		These definitions are scheduled to be eliminated at the earliest
+ *		possible time. The NSPR API is implemented and documented using
+ *		the new definitions.
+ *
+ * As there is no opt-out from pulling in these typedefs, we define the guard
+ * for the file to exclude it. This is incredibly ugly, but seems to be about
+ * the only way around it.
+ */
+#define PROTYPES_H
+#include <nspr.h>
+#undef PROTYPES_H
+#include <nss.h>
+#include <ssl.h>
+#include <sslproto.h>
+#include <pk11func.h>
+#include <prerror.h>
+#include <prinit.h>
+#include <prio.h>
+#include <secerr.h>
+#include <secmod.h>
+
+/*
+ * Ensure that the colliding definitions match, else throw an error. In case
+ * NSPR remove the definition in a future version (however unlikely that may
+ * be, make sure to put ours back again.
+ */
+#if defined(BITS_PER_BYTE)
+#if BITS_PER_BYTE != pg_BITS_PER_BYTE
+#error "incompatible byte widths between NSPR and PostgreSQL"
+#endif
+#else
+#define BITS_PER_BYTE pg_BITS_PER_BYTE
+#endif
+#undef pg_BITS_PER_BYTE
+
+static SECStatus pg_load_nss_module(SECMODModule * *module, const char *library, const char *name);
+static SECStatus pg_bad_cert_handler(void *arg, PRFileDesc * fd);
+static char *pg_SSLerrmessage(PRErrorCode errcode);
+static SECStatus pg_client_auth_handler(void *arg, PRFileDesc * socket, CERTDistNames * caNames,
+										CERTCertificate * *pRetCert, SECKEYPrivateKey * *pRetKey);
+static SECStatus pg_cert_auth_handler(void *arg, PRFileDesc * fd, PRBool checksig, PRBool isServer);
+static int	ssl_protocol_version_to_nss(const char *protocol);
+static bool cert_database_has_CA(PGconn *conn);
+
+static char *PQssl_passwd_cb(PK11SlotInfo * slot, PRBool retry, void *arg);
+
+/*
+ * PR_ImportTCPSocket() is a private API, but very widely used, as it's the
+ * only way to make NSS use an already set up POSIX file descriptor rather
+ * than opening one itself. To quote the NSS documentation:
+ *
+ *		"In theory, code that uses PR_ImportTCPSocket may break when NSPR's
+ *		implementation changes. In practice, this is unlikely to happen because
+ *		NSPR's implementation has been stable for years and because of NSPR's
+ *		strong commitment to backward compatibility."
+ *
+ * https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSPR/Reference/PR_ImportTCPSocket
+ *
+ * The function is declared in <private/pprio.h>, but as it is a header marked
+ * private we declare it here rather than including it.
+ */
+NSPR_API(PRFileDesc *) PR_ImportTCPSocket(int);
+
+static SECMODModule * ca_trust = NULL;
+static NSSInitContext * nss_context = NULL;
+
+/*
+ * Track whether the NSS database has a password set or not. There is no API
+ * function for retrieving password status, so we simply flip this to true in
+ * case NSS invoked the password callback - as that will only happen in case
+ * there is a password. The reason for tracking this is that there are calls
+ * which require a password parameter, but doesn't use the callbacks provided,
+ * so we must call the callback on behalf of these.
+ */
+static bool has_password = false;
+
+#if defined(WIN32)
+static const char *ca_trust_name = "nssckbi.dll";
+#elif defined(__darwin__)
+static const char *ca_trust_name = "libnssckbi.dylib";
+#else
+static const char *ca_trust_name = "libnssckbi.so";
+#endif
+
+static PQsslKeyPassHook_nss_type PQsslKeyPassHook = NULL;
+
+/* ------------------------------------------------------------ */
+/*			 Procedures common to all secure sessions			*/
+/* ------------------------------------------------------------ */
+
+/*
+ * pgtls_init_library
+ *
+ * There is no direct equivalent for PQinitOpenSSL in NSS/NSPR, with PR_Init
+ * being the closest match there is. PR_Init is however already documented to
+ * not be required so simply making this a noop seems like the best option.
+ */
+void
+pgtls_init_library(bool do_ssl, int do_crypto)
+{
+	/* noop */
+}
+
+int
+pgtls_init(PGconn *conn)
+{
+	conn->ssl_in_use = false;
+
+	return 0;
+}
+
+void
+pgtls_close(PGconn *conn)
+{
+	if (nss_context)
+	{
+		NSS_ShutdownContext(nss_context);
+		nss_context = NULL;
+	}
+}
+
+PostgresPollingStatusType
+pgtls_open_client(PGconn *conn)
+{
+	SECStatus	status;
+	PRFileDesc *pr_fd;
+	PRFileDesc *model;
+	NSSInitParameters params;
+	SSLVersionRange desired_range;
+
+	/*
+	 * The NSPR documentation states that runtime initialization via PR_Init
+	 * is no longer required, as the first caller into NSPR will perform the
+	 * initialization implicitly. The documentation doesn't however clarify
+	 * from which version this is holds true, so let's perform the potentially
+	 * superfluous initialization anyways to avoid crashing on older versions
+	 * of NSPR, as there is no difference in overhead.  The NSS documentation
+	 * still states that PR_Init must be called in some way (implicitly or
+	 * explicitly).
+	 *
+	 * The below parameters are what the implicit initialization would've done
+	 * for us, and should work even for older versions where it might not be
+	 * done automatically. The last parameter, maxPTDs, is set to various
+	 * values in other codebases, but has been unused since NSPR 2.1 which was
+	 * released sometime in 1998.
+	 */
+	PR_Init(PR_USER_THREAD, PR_PRIORITY_NORMAL, 0);
+
+	/*
+	 * The original design of NSS was for a single application to use a single
+	 * copy of it, initialized with NSS_Initialize() which isn't returning any
+	 * handle with which to refer to NSS. NSS initialization and shutdown are
+	 * global for the application, so a shutdown in another NSS enabled
+	 * library would cause NSS to be stopped for libpq as well.  The fix has
+	 * been to introduce NSS_InitContext which returns a context handle to
+	 * pass to NSS_ShutdownContext.  NSS_InitContext was introduced in NSS
+	 * 3.12, but the use of it is not very well documented.
+	 * https://bugzilla.redhat.com/show_bug.cgi?id=738456
+	 *
+	 * The InitParameters struct passed can be used to override internal
+	 * values in NSS, but the usage is not documented at all. When using
+	 * NSS_Init initializations, the values are instead set via PK11_Configure
+	 * calls so the PK11_Configure documentation can be used to glean some
+	 * details on these.
+	 *
+	 * https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS/PKCS11/Module_Specs
+	 */
+	memset(&params, 0, sizeof(params));
+	params.length = sizeof(params);
+
+	if (conn->cert_database && strlen(conn->cert_database) > 0)
+	{
+		char	   *cert_database_path = psprintf("sql:%s", conn->cert_database);
+
+		nss_context = NSS_InitContext(cert_database_path, "", "", "",
+									  &params,
+									  NSS_INIT_READONLY | NSS_INIT_PK11RELOAD);
+		pfree(cert_database_path);
+	}
+	else
+		nss_context = NSS_InitContext("", "", "", "", &params,
+									  NSS_INIT_READONLY | NSS_INIT_NOCERTDB |
+									  NSS_INIT_NOMODDB | NSS_INIT_FORCEOPEN |
+									  NSS_INIT_NOROOTINIT | NSS_INIT_PK11RELOAD);
+
+	if (!nss_context)
+	{
+		char	   *err = pg_SSLerrmessage(PR_GetError());
+
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to %s certificate database: %s"),
+						  conn->cert_database ? "open" : "create",
+						  err);
+		free(err);
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * Configure cipher policy.
+	 */
+	status = NSS_SetDomesticPolicy();
+	if (status != SECSuccess)
+	{
+		char	   *err = pg_SSLerrmessage(PR_GetError());
+
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to configure cipher policy: %s"),
+						  err);
+		free(err);
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * If we don't have a certificate database, the system trust store is the
+	 * fallback we can use. If we fail to initialize that as well, we can
+	 * still attempt a connection as long as the sslmode isn't verify*.
+	 */
+	if (!conn->cert_database && conn->sslmode[0] == 'v')
+	{
+		status = pg_load_nss_module(&ca_trust, ca_trust_name, "\"Root Certificates\"");
+		/* status = pg_load_nss_module(&ca_trust, ca_trust_name, "trust"); */
+		if (status != SECSuccess)
+		{
+			char	   *err = pg_SSLerrmessage(PR_GetError());
+
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("WARNING: unable to load NSS trust module \"%s\" : %s"), ca_trust_name, err);
+			return PGRES_POLLING_FAILED;
+		}
+	}
+
+
+	PK11_SetPasswordFunc(PQssl_passwd_cb);
+
+	/*
+	 * Import the already opened socket as we don't want to use NSPR functions
+	 * for opening the network socket due to how the PostgreSQL protocol works
+	 * with TLS connections. This function is not part of the NSPR public API,
+	 * see the comment at the top of the file for the rationale of still using
+	 * it.
+	 */
+	pr_fd = PR_ImportTCPSocket(conn->sock);
+	if (!pr_fd)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to attach to socket: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * Most of the documentation available, and implementations of, NSS/NSPR
+	 * use the PR_NewTCPSocket() function here, which has the drawback that it
+	 * can only create IPv4 sockets. Instead use PR_OpenTCPSocket() which
+	 * copes with IPv6 as well.
+	 */
+	model = SSL_ImportFD(NULL, PR_OpenTCPSocket(conn->laddr.addr.ss_family));
+	if (!model)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to enable TLS: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/* Disable old protocol versions (SSLv2 and SSLv3) */
+	SSL_OptionSet(model, SSL_ENABLE_SSL2, PR_FALSE);
+	SSL_OptionSet(model, SSL_V2_COMPATIBLE_HELLO, PR_FALSE);
+	SSL_OptionSet(model, SSL_ENABLE_SSL3, PR_FALSE);
+
+#ifdef SSL_CBC_RANDOM_IV
+
+	/*
+	 * Enable protection against the BEAST attack in case the NSS library has
+	 * support for that. While SSLv3 is disabled, we may still allow TLSv1
+	 * which is affected. The option isn't documented as an SSL option, but as
+	 * an NSS environment variable.
+	 */
+	SSL_OptionSet(model, SSL_CBC_RANDOM_IV, PR_TRUE);
+#endif
+
+	/* Set us up as a TLS client for the handshake */
+	SSL_OptionSet(model, SSL_HANDSHAKE_AS_CLIENT, PR_TRUE);
+
+	/*
+	 * When setting the available protocols, we either use the user defined
+	 * configuration values, and if missing we accept whatever is the highest
+	 * version supported by the library as the max and only limit the range in
+	 * the other end at TLSv1.0. ssl_variant_stream is a ProtocolVariant enum
+	 * for Stream protocols, rather than datagram.
+	 */
+	SSL_VersionRangeGetSupported(ssl_variant_stream, &desired_range);
+	desired_range.min = SSL_LIBRARY_VERSION_TLS_1_0;
+
+	if (conn->ssl_min_protocol_version && strlen(conn->ssl_min_protocol_version) > 0)
+	{
+		int			ssl_min_ver = ssl_protocol_version_to_nss(conn->ssl_min_protocol_version);
+
+		if (ssl_min_ver == -1)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("invalid value \"%s\" for minimum version of SSL protocol\n"),
+							  conn->ssl_min_protocol_version);
+			return -1;
+		}
+
+		desired_range.min = ssl_min_ver;
+	}
+
+	if (conn->ssl_max_protocol_version && strlen(conn->ssl_max_protocol_version) > 0)
+	{
+		int			ssl_max_ver = ssl_protocol_version_to_nss(conn->ssl_max_protocol_version);
+
+		if (ssl_max_ver == -1)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("invalid value \"%s\" for maximum version of SSL protocol\n"),
+							  conn->ssl_max_protocol_version);
+			return -1;
+		}
+
+		desired_range.max = ssl_max_ver;
+	}
+
+	if (SSL_VersionRangeSet(model, &desired_range) != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to set allowed SSL protocol version range: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * Set up callback for verifying server certificates, as well as for how
+	 * to handle failed verifications.
+	 */
+	SSL_AuthCertificateHook(model, pg_cert_auth_handler, (void *) conn);
+	SSL_BadCertHook(model, pg_bad_cert_handler, (void *) conn);
+
+	/*
+	 * Convert the NSPR socket to an SSL socket. Ensuring the success of this
+	 * operation is critical as NSS SSL_* functions may return SECSuccess on
+	 * the socket even though SSL hasn't been enabled, which introduce a risk
+	 * of silent downgrades.
+	 */
+	conn->pr_fd = SSL_ImportFD(model, pr_fd);
+	if (!conn->pr_fd)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to configure client for TLS: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * The model can now we closed as we've applied the settings of the model
+	 * onto the real socket. From hereon we should only use conn->pr_fd.
+	 */
+	PR_Close(model);
+
+	/* Set the private data to be passed to the password callback */
+	SSL_SetPKCS11PinArg(conn->pr_fd, (void *) conn);
+
+	/*
+	 * If a CRL file has been specified, verify if it exists in the database
+	 * but don't fail in case it doesn't.
+	 */
+	if (conn->sslcrl && strlen(conn->sslcrl) > 0)
+	{
+		/* XXX: Implement me.. */
+	}
+
+	status = SSL_ResetHandshake(conn->pr_fd, PR_FALSE);
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to initiate handshake: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * Set callback for client authentication when requested by the server.
+	 */
+	SSL_GetClientAuthDataHook(conn->pr_fd, pg_client_auth_handler, (void *) conn);
+
+	/*
+	 * Specify which hostname we are expecting to talk to. This is required,
+	 * albeit mostly applies to when opening a connection to a traditional
+	 * http server it seems.
+	 */
+	SSL_SetURL(conn->pr_fd, (conn->connhost[conn->whichhost]).host);
+
+	do
+	{
+		status = SSL_ForceHandshake(conn->pr_fd);
+	}
+	while (status != SECSuccess && PR_GetError() == PR_WOULD_BLOCK_ERROR);
+
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("SSL error: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	conn->ssl_in_use = true;
+	return PGRES_POLLING_OK;
+}
+
+ssize_t
+pgtls_read(PGconn *conn, void *ptr, size_t len)
+{
+	PRInt32		nread;
+	PRErrorCode status;
+	int			read_errno = 0;
+
+	nread = PR_Recv(conn->pr_fd, ptr, len, 0, PR_INTERVAL_NO_WAIT);
+
+	/*
+	 * PR_Recv blocks until there is data to read or the timeout expires. Zero
+	 * is returned for closed connections, while -1 indicates an error within
+	 * the ongoing connection.
+	 */
+	if (nread == 0)
+	{
+		read_errno = ECONNRESET;
+		return -1;
+	}
+
+	if (nread == -1)
+	{
+		status = PR_GetError();
+
+		switch (status)
+		{
+			case PR_WOULD_BLOCK_ERROR:
+				read_errno = EINTR;
+				break;
+
+			case PR_IO_TIMEOUT_ERROR:
+				break;
+
+				/*
+				 * The error cases for PR_Recv are not documented, but can be
+				 * reverse engineered from _MD_unix_map_default_error() in the
+				 * NSPR code, defined in pr/src/md/unix/unix_errors.c.
+				 */
+			default:
+				printfPQExpBuffer(&conn->errorMessage,
+								  libpq_gettext("TLS read error: %s"),
+								  pg_SSLerrmessage(status));
+				break;
+		}
+	}
+
+	SOCK_ERRNO_SET(read_errno);
+	return (ssize_t) nread;
+}
+
+/*
+ * pgtls_read_pending
+ *		Check for the existence of data to be read.
+ *
+ * This is part of the PostgreSQL TLS backend API.
+ */
+bool
+pgtls_read_pending(PGconn *conn)
+{
+	unsigned char c;
+	int			n;
+
+	/*
+	 * PR_Recv peeks into the stream with the timeount turned off, to see if
+	 * there is another byte to read off the wire. There is an NSS function
+	 * SSL_DataPending() which might seem like a better fit, but it will only
+	 * check already encrypted data in the SSL buffer, not still unencrypted
+	 * data, thus it doesn't guarantee that a subsequent call to
+	 * PR_Read/PR_Recv wont block.
+	 */
+	n = PR_Recv(conn->pr_fd, &c, 1, PR_MSG_PEEK, PR_INTERVAL_NO_WAIT);
+	return (n > 0);
+}
+
+ssize_t
+pgtls_write(PGconn *conn, const void *ptr, size_t len)
+{
+	PRInt32		n;
+	PRErrorCode status;
+	int			write_errno = 0;
+
+	n = PR_Write(conn->pr_fd, ptr, len);
+
+	if (n < 0)
+	{
+		status = PR_GetError();
+
+		switch (status)
+		{
+			case PR_WOULD_BLOCK_ERROR:
+#ifdef EAGAIN
+				write_errno = EAGAIN;
+#else
+				write_errno = EINTR;
+#endif
+				break;
+
+			default:
+				printfPQExpBuffer(&conn->errorMessage,
+								  libpq_gettext("TLS write error: %s"),
+								  pg_SSLerrmessage(status));
+				write_errno = ECONNRESET;
+				break;
+		}
+	}
+
+	SOCK_ERRNO_SET(write_errno);
+	return (ssize_t) n;
+}
+
+/*
+ *	Verify that the server certificate matches the hostname we connected to.
+ *
+ * The certificate's Common Name and Subject Alternative Names are considered.
+ */
+int
+pgtls_verify_peer_name_matches_certificate_guts(PGconn *conn,
+												int *names_examined,
+												char **first_name)
+{
+	return 1;
+}
+
+/* ------------------------------------------------------------ */
+/*			PostgreSQL specific TLS support functions			*/
+/* ------------------------------------------------------------ */
+
+/*
+ * TODO: this a 99% copy of the same function in the backend, make these share
+ * a single implementation instead.
+ */
+static char *
+pg_SSLerrmessage(PRErrorCode errcode)
+{
+	const char *error;
+
+	error = PR_ErrorToName(errcode);
+	if (error)
+		return strdup(error);
+
+	return strdup("unknown TLS error");
+}
+
+static SECStatus
+pg_load_nss_module(SECMODModule * *module, const char *library, const char *name)
+{
+	SECMODModule *mod;
+	char	   *modulespec;
+
+	modulespec = psprintf("library=\"%s\", name=\"%s\"", library, name);
+
+	/*
+	 * Attempt to load the specified module. The second parameter is "parent"
+	 * which should always be NULL for application code. The third parameter
+	 * defines if loading should recurse which is only applicable when loading
+	 * a module from within another module. This hierarchy would have to be
+	 * defined in the modulespec, and since we don't support anything but
+	 * directly addressed modules we should pass PR_FALSE.
+	 */
+	mod = SECMOD_LoadUserModule(modulespec, NULL, PR_FALSE);
+	pfree(modulespec);
+
+	if (mod && mod->loaded)
+	{
+		*module = mod;
+		return SECSuccess;
+	}
+
+	SECMOD_DestroyModule(mod);
+	return SECFailure;
+}
+
+/* ------------------------------------------------------------ */
+/*						NSS Callbacks							*/
+/* ------------------------------------------------------------ */
+
+/*
+ * pg_cert_auth_handler
+ *			Callback for authenticating server certificate
+ *
+ * This is pretty much the same procedure as the SSL_AuthCertificate function
+ * provided by NSS, with the difference being server hostname validation. With
+ * SSL_AuthCertificate there is no way to do verify-ca, it only does the -full
+ * flavor of our sslmodes, so we need our own implementation.
+ */
+static SECStatus
+pg_cert_auth_handler(void *arg, PRFileDesc * fd, PRBool checksig, PRBool isServer)
+{
+	SECStatus	status;
+	PGconn	   *conn = (PGconn *) arg;
+	char	   *server_hostname = NULL;
+	CERTCertificate *server_cert;
+	void	   *pin;
+
+	Assert(!isServer);
+
+	pin = SSL_RevealPinArg(conn->pr_fd);
+	server_cert = SSL_PeerCertificate(conn->pr_fd);
+
+	status = CERT_VerifyCertificateNow((CERTCertDBHandle *) CERT_GetDefaultCertDB(), server_cert,
+									   checksig, certificateUsageSSLServer,
+									   pin, NULL);
+
+	/*
+	 * If we've already failed validation then there is no point in also
+	 * performing the hostname check for verify-full.
+	 */
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to verify certificate: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		goto done;
+	}
+
+	if (strcmp(conn->sslmode, "verify-full") == 0)
+	{
+		server_hostname = SSL_RevealURL(conn->pr_fd);
+		if (!server_hostname || server_hostname[0] == '\0')
+			goto done;
+
+		/*
+		 * CERT_VerifyCertName will internally perform RFC 2818 SubjectAltName
+		 * verification.
+		 */
+		status = CERT_VerifyCertName(server_cert, server_hostname);
+		if (status != SECSuccess)
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("unable to verify server hostname: %s"),
+							  pg_SSLerrmessage(PR_GetError()));
+
+	}
+
+done:
+	if (server_hostname)
+		PR_Free(server_hostname);
+
+	CERT_DestroyCertificate(server_cert);
+	return status;
+}
+
+/*
+ * pg_client_auth_handler
+ *		Callback for client certificate validation
+ *
+ * The client auth callback is not on by default in NSS, so we need to invoke
+ * it ourselves to ensure we can do cert authentication. A TODO is to support
+ * running without a specified sslcert parameter. By retrieving all the certs
+ * via nickname from the cert database and see if we find one which apply with
+ * NSS_CmpCertChainWCANames() and PK11_FindKeyByAnyCert() we could support
+ * just running with a ssl database specified.
+ *
+ * For now, we use the default client certificate validation which requires a
+ * defined nickname to identify the cert in the database.
+ */
+static SECStatus
+pg_client_auth_handler(void *arg, PRFileDesc * socket, CERTDistNames * caNames,
+					   CERTCertificate * *pRetCert, SECKEYPrivateKey * *pRetKey)
+{
+	PGconn	   *conn = (PGconn *) arg;
+
+	return NSS_GetClientAuthData(conn->sslcert, socket, caNames, pRetCert, pRetKey);
+}
+
+/*
+ * pg_bad_cert_handler
+ *		Callback for failed certificate validation
+ *
+ * The TLS handshake will call this function iff the server certificate failed
+ * validation. Depending on the sslmode, we allow the connection anyways.
+ */
+static SECStatus
+pg_bad_cert_handler(void *arg, PRFileDesc * fd)
+{
+	PGconn	   *conn = (PGconn *) arg;
+	PRErrorCode err;
+
+	/*
+	 * This really shouldn't happen, as we've the the PGconn object as our
+	 * callback data, and at the callsite we know it will be populated. That
+	 * being said, the NSS code itself performs this check even when it should
+	 * not be required so let's use the same belts with our suspenders.
+	 */
+	if (!arg)
+		return SECFailure;
+
+	/*
+	 * For sslmodes other than verify-full and verify-ca we don't perform peer
+	 * validation, so return immediately.  sslmode require with a database
+	 * specified which contains a CA certificate will work like verify-ca to
+	 * be compatible with the OpenSSL implementation.
+	 */
+	if (strcmp(conn->sslmode, "require") == 0)
+	{
+		if (conn->cert_database && strlen(conn->cert_database) > 0 && cert_database_has_CA(conn))
+			return SECFailure;
+	}
+	if (conn->sslmode[0] == 'v')
+		return SECFailure;
+
+	err = PORT_GetError();
+
+	/*
+	 * TODO: these are relevant error codes that can occur in certificate
+	 * validation, figure out which we dont want for require/prefer etc.
+	 */
+	switch (err)
+	{
+		case SEC_ERROR_INVALID_AVA:
+		case SEC_ERROR_INVALID_TIME:
+		case SEC_ERROR_BAD_SIGNATURE:
+		case SEC_ERROR_EXPIRED_CERTIFICATE:
+		case SEC_ERROR_UNKNOWN_ISSUER:
+		case SEC_ERROR_UNTRUSTED_ISSUER:
+		case SEC_ERROR_UNTRUSTED_CERT:
+		case SEC_ERROR_CERT_VALID:
+		case SEC_ERROR_EXPIRED_ISSUER_CERTIFICATE:
+		case SEC_ERROR_CRL_EXPIRED:
+		case SEC_ERROR_CRL_BAD_SIGNATURE:
+		case SEC_ERROR_EXTENSION_VALUE_INVALID:
+		case SEC_ERROR_CA_CERT_INVALID:
+		case SEC_ERROR_CERT_USAGES_INVALID:
+		case SEC_ERROR_UNKNOWN_CRITICAL_EXTENSION:
+			return SECSuccess;
+			break;
+		default:
+			return SECFailure;
+			break;
+	}
+
+	/* Unreachable */
+	return SECSuccess;
+}
+
+/* ------------------------------------------------------------ */
+/*					SSL information functions					*/
+/* ------------------------------------------------------------ */
+
+/*
+ * PQgetssl
+ *
+ * Return NULL as this is legacy and defined to always be equal to calling
+ * PQsslStruct(conn, "OpenSSL"); This should ideally trigger a logged warning
+ * somewhere as it's nonsensical to run in a non-OpenSSL build, but the color
+ * of said bikeshed hasn't yet been determined.
+ */
+void *
+PQgetssl(PGconn *conn)
+{
+	return NULL;
+}
+
+void *
+PQsslStruct(PGconn *conn, const char *struct_name)
+{
+	if (!conn)
+		return NULL;
+
+	/*
+	 * Return the underlying PRFileDesc which can be used to access
+	 * information on the connection details. There is no SSL context per se.
+	 */
+	if (strcmp(struct_name, "NSS") == 0)
+		return conn->pr_fd;
+	return NULL;
+}
+
+const char *const *
+PQsslAttributeNames(PGconn *conn)
+{
+	static const char *const result[] = {
+		"library",
+		"cipher",
+		"protocol",
+		"key_bits",
+		"compression",
+		NULL
+	};
+
+	return result;
+}
+
+const char *
+PQsslAttribute(PGconn *conn, const char *attribute_name)
+{
+	SECStatus	status;
+	SSLChannelInfo channel;
+	SSLCipherSuiteInfo suite;
+
+	if (!conn || !conn->pr_fd)
+		return NULL;
+
+	if (strcmp(attribute_name, "library") == 0)
+		return "NSS";
+
+	status = SSL_GetChannelInfo(conn->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+		return NULL;
+
+	status = SSL_GetCipherSuiteInfo(channel.cipherSuite, &suite, sizeof(suite));
+	if (status != SECSuccess)
+		return NULL;
+
+	if (strcmp(attribute_name, "cipher") == 0)
+		return suite.cipherSuiteName;
+
+	if (strcmp(attribute_name, "key_bits") == 0)
+	{
+		static char key_bits_str[8];
+
+		snprintf(key_bits_str, sizeof(key_bits_str), "%i", suite.effectiveKeyBits);
+		return key_bits_str;
+	}
+
+	if (strcmp(attribute_name, "protocol") == 0)
+	{
+		switch (channel.protocolVersion)
+		{
+#ifdef SSL_LIBRARY_VERSION_TLS_1_3
+			case SSL_LIBRARY_VERSION_TLS_1_3:
+				return "TLSv1.3";
+#endif
+#ifdef SSL_LIBRARY_VERSION_TLS_1_2
+			case SSL_LIBRARY_VERSION_TLS_1_2:
+				return "TLSv1.2";
+#endif
+#ifdef SSL_LIBRARY_VERSION_TLS_1_1
+			case SSL_LIBRARY_VERSION_TLS_1_1:
+				return "TLSv1.1";
+#endif
+			case SSL_LIBRARY_VERSION_TLS_1_0:
+				return "TLSv1.0";
+			default:
+				return "unknown";
+		}
+	}
+
+	/*
+	 * NSS disabled support for compression in version 3.33, and it was only
+	 * available for SSLv3 at that point anyways, so we can safely return off
+	 * here without checking.
+	 */
+	if (strcmp(attribute_name, "compression") == 0)
+		return "off";
+
+	return NULL;
+}
+
+static int
+ssl_protocol_version_to_nss(const char *protocol)
+{
+	if (pg_strcasecmp("TLSv1", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_0;
+
+#ifdef SSL_LIBRARY_VERSION_TLS_1_1
+	if (pg_strcasecmp("TLSv1.1", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_1;
+#endif
+
+#ifdef SSL_LIBRARY_VERSION_TLS_1_2
+	if (pg_strcasecmp("TLSv1.2", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_2;
+#endif
+
+#ifdef SSL_LIBRARY_VERSION_TLS_1_3
+	if (pg_strcasecmp("TLSv1.3", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_3;
+#endif
+
+	return -1;
+}
+
+static bool
+cert_database_has_CA(PGconn *conn)
+{
+	CERTCertList *certificates;
+	bool		hasCA;
+
+	/*
+	 * If the certificate database has a password we must provide it, since
+	 * this API doesn't invoke the standard password callback.
+	 */
+	if (has_password)
+		certificates = PK11_ListCerts(PK11CertListCA, PQssl_passwd_cb(NULL, PR_FALSE, (void *) conn));
+	else
+		certificates = PK11_ListCerts(PK11CertListCA, NULL);
+	hasCA = !CERT_LIST_EMPTY(certificates);
+	CERT_DestroyCertList(certificates);
+
+	return hasCA;
+}
+
+PQsslKeyPassHook_nss_type
+PQgetSSLKeyPassHook_nss(void)
+{
+	return PQsslKeyPassHook;
+}
+
+void
+PQsetSSLKeyPassHook_nss(PQsslKeyPassHook_nss_type hook)
+{
+	PQsslKeyPassHook = hook;
+}
+
+/*
+ * Supply a password to decrypt a client certificate.
+ *
+ * This must match NSS type PK11PasswordFunc.
+ */
+static char *
+PQssl_passwd_cb(PK11SlotInfo * slot, PRBool retry, void *arg)
+{
+	has_password = true;
+
+	if (PQsslKeyPassHook)
+		return PQsslKeyPassHook(slot, (PRBool) retry, arg);
+	else
+		return PQdefaultSSLKeyPassHook_nss(slot, retry, arg);
+}
+
+/*
+ * The default password handler callback.
+ */
+char *
+PQdefaultSSLKeyPassHook_nss(PK11SlotInfo * slot, PRBool retry, void *arg)
+{
+	PGconn	   *conn = (PGconn *) arg;
+
+	/*
+	 * If the password didn't work the first time there is no point in
+	 * retrying as it hasn't changed.
+	 */
+	if (retry != PR_TRUE && conn->sslpassword && strlen(conn->sslpassword) > 0)
+		return PORT_Strdup(conn->sslpassword);
+
+	return NULL;
+}
diff --git a/src/interfaces/libpq/fe-secure.c b/src/interfaces/libpq/fe-secure.c
index 3311fd7a5b..b6c92ece11 100644
--- a/src/interfaces/libpq/fe-secure.c
+++ b/src/interfaces/libpq/fe-secure.c
@@ -430,6 +430,9 @@ PQsslAttributeNames(PGconn *conn)
 
 	return result;
 }
+#endif /* USE_SSL */
+
+#ifndef USE_OPENSSL
 
 PQsslKeyPassHook_OpenSSL_type
 PQgetSSLKeyPassHook_OpenSSL(void)
@@ -448,7 +451,7 @@ PQdefaultSSLKeyPassHook_OpenSSL(char *buf, int size, PGconn *conn)
 {
 	return 0;
 }
-#endif							/* USE_SSL */
+#endif							/* USE_OPENSSL */
 
 /* Dummy version of GSSAPI information functions, when built without GSS support */
 #ifndef ENABLE_GSS
diff --git a/src/interfaces/libpq/libpq-fe.h b/src/interfaces/libpq/libpq-fe.h
index 3b6a9fbce3..27c16e187f 100644
--- a/src/interfaces/libpq/libpq-fe.h
+++ b/src/interfaces/libpq/libpq-fe.h
@@ -625,6 +625,17 @@ extern PQsslKeyPassHook_OpenSSL_type PQgetSSLKeyPassHook_OpenSSL(void);
 extern void PQsetSSLKeyPassHook_OpenSSL(PQsslKeyPassHook_OpenSSL_type hook);
 extern int	PQdefaultSSLKeyPassHook_OpenSSL(char *buf, int size, PGconn *conn);
 
+/* == in fe-secure-nss.c === */
+typedef struct PK11SlotInfoStr PK11SlotInfo;
+typedef int PRIntn;
+typedef PRIntn PRBool;
+
+/* Support for overriding sslpassword handling with a callback. */
+typedef char *(*PQsslKeyPassHook_nss_type) (PK11SlotInfo * slot, PRBool retry, void *arg);
+extern PQsslKeyPassHook_nss_type PQgetSSLKeyPassHook_nss(void);
+extern void PQsetSSLKeyPassHook_nss(PQsslKeyPassHook_nss_type hook);
+extern char *PQdefaultSSLKeyPassHook_nss(PK11SlotInfo * slot, PRBool retry, void *arg);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/src/interfaces/libpq/libpq-int.h b/src/interfaces/libpq/libpq-int.h
index 1de91ae295..12717ca720 100644
--- a/src/interfaces/libpq/libpq-int.h
+++ b/src/interfaces/libpq/libpq-int.h
@@ -362,6 +362,7 @@ struct pg_conn
 	char	   *sslpassword;	/* client key file password */
 	char	   *sslrootcert;	/* root certificate filename */
 	char	   *sslcrl;			/* certificate revocation list filename */
+	char	   *cert_database;
 	char	   *requirepeer;	/* required peer credentials for local sockets */
 	char	   *gssencmode;		/* GSS mode (require,prefer,disable) */
 	char	   *krbsrvname;		/* Kerberos service name */
@@ -485,6 +486,10 @@ struct pg_conn
 								 * OpenSSL version changes */
 #endif
 #endif							/* USE_OPENSSL */
+
+#ifdef USE_NSS
+	void	   *pr_fd;
+#endif							/* USE_NSS */
 #endif							/* USE_SSL */
 
 #ifdef ENABLE_GSS
diff --git a/src/test/Makefile b/src/test/Makefile
index efb206aa75..d18f5a083b 100644
--- a/src/test/Makefile
+++ b/src/test/Makefile
@@ -27,7 +27,7 @@ ifneq (,$(filter ldap,$(PG_TEST_EXTRA)))
 SUBDIRS += ldap
 endif
 endif
-ifeq ($(with_openssl),yes)
+ifeq ($(with_ssl),yes)
 ifneq (,$(filter ssl,$(PG_TEST_EXTRA)))
 SUBDIRS += ssl
 endif
diff --git a/src/test/ssl/Makefile b/src/test/ssl/Makefile
index 777ee39413..fe265e2dbd 100644
--- a/src/test/ssl/Makefile
+++ b/src/test/ssl/Makefile
@@ -14,6 +14,7 @@ top_builddir = ../../..
 include $(top_builddir)/src/Makefile.global
 
 export with_openssl
+export with_nss
 
 CERTIFICATES := server_ca server-cn-and-alt-names \
 	server-cn-only server-single-alt-name server-multiple-alt-names \
@@ -30,6 +31,32 @@ SSLFILES := $(CERTIFICATES:%=ssl/%.key) $(CERTIFICATES:%=ssl/%.crt) \
 	ssl/client+client_ca.crt ssl/client-der.key \
 	ssl/client-encrypted-pem.key ssl/client-encrypted-der.key
 
+# Even though we in practice could get away with far fewer NSS databases, they
+# are generated to mimick the setup for the OpenSSL tests in order to ensure
+# we isolate the same behavior between the backends. The database name should
+# contain the files included for easier test suite code reading.
+NSSFILES := ssl/nss/client_ca.crt.db \
+	ssl/nss/server_ca.crt.db \
+	ssl/nss/root+server_ca.crt.db \
+	ssl/nss/root+client_ca.crt.db \
+	ssl/nss/client.crt__client.key.db \
+	ssl/nss/client-revoked.crt__client-revoked.key.db \
+	ssl/nss/server-cn-only.crt__server-password.key.db \
+	ssl/nss/server-cn-only.crt__server-cn-only.key.db \
+	ssl/nss/root.crl \
+	ssl/nss/server.crl \
+	ssl/nss/client.crl \
+	ssl/nss/server-multiple-alt-names.crt__server-multiple-alt-names.key.db \
+	ssl/nss/server-single-alt-name.crt__server-single-alt-name.key.db \
+	ssl/nss/server-cn-and-alt-names.crt__server-cn-and-alt-names.key.db \
+	ssl/nss/server-no-names.crt__server-no-names.key.db \
+	ssl/nss/server-revoked.crt__server-revoked.key.db \
+	ssl/nss/root+client.crl \
+	ssl/nss/client+client_ca.crt__client.key.db \
+	ssl/nss/client.crt__client-encrypted-pem.key.db \
+	ssl/nss/root+server_ca.crt__server.crl.db \
+	ssl/nss/root+server_ca.crt__root+server.crl.db
+
 # This target re-generates all the key and certificate files. Usually we just
 # use the ones that are committed to the tree without rebuilding them.
 #
@@ -37,6 +64,10 @@ SSLFILES := $(CERTIFICATES:%=ssl/%.key) $(CERTIFICATES:%=ssl/%.crt) \
 #
 sslfiles: $(SSLFILES)
 
+# Generate NSS certificate databases corresponding to the OpenSSL certificates.
+# This target will fail unless preceded by nssfiles-clean.
+nssfiles: $(NSSFILES)
+
 # OpenSSL requires a directory to put all generated certificates in. We don't
 # use this for anything, but we need a location.
 ssl/new_certs_dir:
@@ -64,6 +95,24 @@ ssl/%_ca.crt: ssl/%_ca.key %_ca.config ssl/root_ca.crt ssl/new_certs_dir
 	rm ssl/temp_ca.crt ssl/temp_ca_signed.crt
 	echo "01" > ssl/$*_ca.srl
 
+ssl/nss/%_ca.crt.db: ssl/%_ca.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n $*_ca.crt -i ssl/$*_ca.crt -t "CT,C,C"
+
+ssl/nss/root+server_ca.crt__server.crl.db: ssl/root+server_ca.crt ssl/nss/server.crl
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	crlutil -I -i ssl/nss/server.crl -d $@ -B
+
+ssl/nss/root+server_ca.crt__root+server.crl.db: ssl/root+server_ca.crt ssl/nss/root.crl ssl/nss/server.crl
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	crlutil -I -i ssl/nss/root.crl -d $@ -B
+	crlutil -I -i ssl/nss/server.crl -d $@ -B
+
 # Server certificates, signed by server CA:
 ssl/server-%.crt: ssl/server-%.key ssl/server_ca.crt server-%.config
 	openssl req -new -key ssl/server-$*.key -out ssl/server-$*.csr -config server-$*.config
@@ -77,6 +126,74 @@ ssl/server-ss.crt: ssl/server-cn-only.key ssl/server-cn-only.crt server-cn-only.
 	openssl x509 -req -days 10000 -in ssl/server-ss.csr -signkey ssl/server-cn-only.key -out ssl/server-ss.crt  -extensions v3_req -extfile server-cn-only.config
 	rm ssl/server-ss.csr
 
+ssl/nss/server-cn-only.crt__server-password.key.db: ssl/server-cn-only.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-cn-only.crt -i ssl/server-cn-only.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-password.pfx -inkey ssl/server-password.key -in ssl/server-cn-only.crt -certfile ssl/server_ca.crt -passin 'pass:secret1' -passout pass:
+	pk12util -i ssl/nss/server-password.pfx -d $@ -W ''
+
+ssl/nss/server-cn-only.crt__server-cn-only.key.db: ssl/server-cn-only.crt ssl/server-cn-only.key
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-cn-only.crt -i ssl/server-cn-only.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-cn-only.pfx -inkey ssl/server-cn-only.key -in ssl/server-cn-only.crt -certfile ssl/server_ca.crt -passout pass:
+	pk12util -i ssl/nss/server-cn-only.pfx -d $@ -W ''
+
+ssl/nss/server-multiple-alt-names.crt__server-multiple-alt-names.key.db: ssl/server-multiple-alt-names.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-multiple-alt-names.crt -i ssl/server-multiple-alt-names.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-multiple-alt-names.pfx -inkey ssl/server-multiple-alt-names.key -in ssl/server-multiple-alt-names.crt -certfile ssl/server-multiple-alt-names.crt -passout pass:
+	pk12util -i ssl/nss/server-multiple-alt-names.pfx -d $@ -W ''
+
+ssl/nss/server-single-alt-name.crt__server-single-alt-name.key.db: ssl/server-single-alt-name.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-single-alt-name.crt -i ssl/server-single-alt-name.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-single-alt-name.pfx -inkey ssl/server-single-alt-name.key -in ssl/server-single-alt-name.crt -certfile ssl/server-single-alt-name.crt -passout pass:
+	pk12util -i ssl/nss/server-single-alt-name.pfx -d $@ -W ''
+
+ssl/nss/server-cn-and-alt-names.crt__server-cn-and-alt-names.key.db: ssl/server-cn-and-alt-names.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-cn-and-alt-names.crt -i ssl/server-cn-and-alt-names.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-cn-and-alt-names.pfx -inkey ssl/server-cn-and-alt-names.key -in ssl/server-cn-and-alt-names.crt -certfile ssl/server-cn-and-alt-names.crt -passout pass:
+	pk12util -i ssl/nss/server-cn-and-alt-names.pfx -d $@ -W ''
+
+ssl/nss/server-no-names.crt__server-no-names.key.db: ssl/server-no-names.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-no-names.crt -i ssl/server-no-names.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-no-names.pfx -inkey ssl/server-no-names.key -in ssl/server-no-names.crt -certfile ssl/server-no-names.crt -passout pass:
+	pk12util -i ssl/nss/server-no-names.pfx -d $@ -W ''
+
+ssl/nss/server-revoked.crt__server-revoked.key.db: ssl/server-revoked.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-revoked.crt -i ssl/server-revoked.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-revoked.pfx -inkey ssl/server-revoked.key -in ssl/server-revoked.crt -certfile ssl/server-revoked.crt -passout pass:
+	pk12util -i ssl/nss/server-revoked.pfx -d $@ -W ''
+
 # Password-protected version of server-cn-only.key
 ssl/server-password.key: ssl/server-cn-only.key
 	openssl rsa -aes256 -in $< -out $@ -passout 'pass:secret1'
@@ -88,6 +205,27 @@ ssl/client.crt: ssl/client.key ssl/client_ca.crt
 	openssl x509 -in ssl/temp.crt -out ssl/client.crt # to keep just the PEM cert
 	rm ssl/client.csr ssl/temp.crt
 
+# Client certificate, signed by client CA
+ssl/nss/client.crt__client.key.db: ssl/client.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/client.crt -i ssl/client.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root+client_ca.crt -i ssl/root+client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client.pfx -inkey ssl/client.key -in ssl/client.crt -certfile ssl/client_ca.crt -passout pass:
+	pk12util -i ssl/nss/client.pfx -d $@ -W ''
+
+# Client certificate with encrypted key, signed by client CA
+ssl/nss/client.crt__client-encrypted-pem.key.db: ssl/client.crt
+	$(MKDIR_P) $@
+	echo 'dUmmyP^#+' > $@.pass
+	certutil -d "sql:$@" -N -f $@.pass
+	certutil -d "sql:$@" -A -f $@.pass -n ssl/client.crt -i ssl/client.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -f $@.pass -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -f $@.pass -n root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client-encrypted-pem.pfx -inkey ssl/client-encrypted-pem.key -in ssl/client.crt -certfile ssl/client_ca.crt -passin pass:'dUmmyP^#+' -passout pass:'dUmmyP^#+'
+	pk12util -i ssl/nss/client-encrypted-pem.pfx -d $@ -W 'dUmmyP^#+' -k $@.pass
+
 # Another client certificate, signed by the client CA. This one is revoked.
 ssl/client-revoked.crt: ssl/client-revoked.key ssl/client_ca.crt client.config
 	openssl req -new -key ssl/client-revoked.key -out ssl/client-revoked.csr -config client.config
@@ -95,6 +233,14 @@ ssl/client-revoked.crt: ssl/client-revoked.key ssl/client_ca.crt client.config
 	openssl x509 -in ssl/temp.crt -out ssl/client-revoked.crt # to keep just the PEM cert
 	rm ssl/client-revoked.csr ssl/temp.crt
 
+ssl/nss/client-revoked.crt__client-revoked.key.db: ssl/client-revoked.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/client-revoked.crt -i ssl/client-revoked.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client-revoked.pfx -inkey ssl/client-revoked.key -in ssl/client-revoked.crt -certfile ssl/client_ca.crt -passout pass:
+	pk12util -i ssl/nss/client-revoked.pfx -d $@ -W ''
+
 # Convert the key to DER, to test our behaviour there too
 ssl/client-der.key: ssl/client.key
 	openssl rsa -in ssl/client.key -outform DER -out ssl/client-der.key
@@ -127,19 +273,40 @@ ssl/root+client_ca.crt: ssl/root_ca.crt ssl/client_ca.crt
 ssl/client+client_ca.crt: ssl/client.crt ssl/client_ca.crt
 	cat $^ > $@
 
+# Client certificate, signed by client CA
+ssl/nss/client+client_ca.crt__client.key.db: ssl/client+client_ca.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/client+client_ca.crt -i ssl/client+client_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n ssl/root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client.pfx -inkey ssl/client.key -in ssl/client.crt -certfile ssl/client_ca.crt -passout pass:
+	pk12util -i ssl/nss/client.pfx -d $@ -W ''
+
 #### CRLs
 
 ssl/client.crl: ssl/client-revoked.crt
 	openssl ca -config cas.config -name client_ca -revoke ssl/client-revoked.crt
 	openssl ca -config cas.config -name client_ca -gencrl -out ssl/client.crl
 
+ssl/nss/client.crl: ssl/client.crl
+	openssl crl -in $^ -outform der -out $@
+
 ssl/server.crl: ssl/server-revoked.crt
 	openssl ca -config cas.config -name server_ca -revoke ssl/server-revoked.crt
 	openssl ca -config cas.config -name server_ca -gencrl -out ssl/server.crl
 
+ssl/nss/server.crl: ssl/server.crl
+	openssl crl -in $^ -outform der -out $@
+
 ssl/root.crl: ssl/root_ca.crt
 	openssl ca -config cas.config -name root_ca -gencrl -out ssl/root.crl
 
+ssl/nss/root.crl: ssl/root.crl
+	openssl crl -in $^ -outform der -out $@
+
+ssl/nss/root+client.crl: ssl/root+client.crl
+	openssl crl -in $^ -outform der -out $@
+
 # If a CRL is used, OpenSSL requires a CRL file for *all* the CAs in the
 # chain, even if some of them are empty.
 ssl/root+server.crl: ssl/root.crl ssl/server.crl
@@ -151,9 +318,14 @@ ssl/root+client.crl: ssl/root.crl ssl/client.crl
 sslfiles-clean:
 	rm -f $(SSLFILES) ssl/client_ca.srl ssl/server_ca.srl ssl/client_ca-certindex* ssl/server_ca-certindex* ssl/root_ca-certindex* ssl/root_ca.srl ssl/temp_ca.crt ssl/temp_ca_signed.crt
 
+.PHONY: nssfiles-clean
+nssfiles-clean:
+	rm -rf ssl/nss
+
 clean distclean maintainer-clean:
 	rm -rf tmp_check
 	rm -rf ssl/*.old ssl/new_certs_dir ssl/client*_tmp.key
+	rm -rf ssl/nss
 
 # Doesn't depend on $(SSLFILES) because we don't rebuild them by default
 check:
diff --git a/src/test/ssl/ssl/nss/client+client_ca.crt__client.key.db/cert9.db b/src/test/ssl/ssl/nss/client+client_ca.crt__client.key.db/cert9.db
new file mode 100644
index 0000000000000000000000000000000000000000..e8d1510529438b26c31e0880163aa391bd1870d0
GIT binary patch
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diff --git a/src/test/ssl/ssl/nss/client+client_ca.crt__client.key.db/key4.db b/src/test/ssl/ssl/nss/client+client_ca.crt__client.key.db/key4.db
new file mode 100644
index 0000000000000000000000000000000000000000..44e6fcf5307a8b2e6cbf9878b157d7cb3e3a3f25
GIT binary patch
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diff --git a/src/test/ssl/ssl/nss/client+client_ca.crt__client.key.db/pkcs11.txt b/src/test/ssl/ssl/nss/client+client_ca.crt__client.key.db/pkcs11.txt
new file mode 100644
index 0000000000..dfffe92b90
--- /dev/null
+++ b/src/test/ssl/ssl/nss/client+client_ca.crt__client.key.db/pkcs11.txt
@@ -0,0 +1,5 @@
+library=
+name=NSS Internal PKCS #11 Module
+parameters=configdir='sql:ssl/nss/client+client_ca.crt__client.key.db' certPrefix='' keyPrefix='' secmod='secmod.db' flags= updatedir='' updateCertPrefix='' updateKeyPrefix='' updateid='' updateTokenDescription='' 
+NSS=Flags=internal,critical trustOrder=75 cipherOrder=100 slotParams=(1={slotFlags=[ECC,RSA,DSA,DH,RC2,RC4,DES,RANDOM,SHA1,MD5,MD2,SSL,TLS,AES,Camellia,SEED,SHA256,SHA512] askpw=any timeout=30})
+
diff --git a/src/test/ssl/ssl/nss/client-encrypted-pem.pfx b/src/test/ssl/ssl/nss/client-encrypted-pem.pfx
new file mode 100644
index 0000000000000000000000000000000000000000..4472d88ab737eb98c25d0e5fdc5124533529089d
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diff --git a/src/test/ssl/ssl/nss/client-revoked.crt__client-revoked.key.db/cert9.db b/src/test/ssl/ssl/nss/client-revoked.crt__client-revoked.key.db/cert9.db
new file mode 100644
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diff --git a/src/test/ssl/ssl/nss/client-revoked.crt__client-revoked.key.db/key4.db b/src/test/ssl/ssl/nss/client-revoked.crt__client-revoked.key.db/key4.db
new file mode 100644
index 0000000000000000000000000000000000000000..2a094273f3761c4c1ecc6a59b28f1147d13b7736
GIT binary patch
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literal 0
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diff --git a/src/test/ssl/ssl/nss/client-revoked.crt__client-revoked.key.db/pkcs11.txt b/src/test/ssl/ssl/nss/client-revoked.crt__client-revoked.key.db/pkcs11.txt
new file mode 100644
index 0000000000..67ce598fd3
--- /dev/null
+++ b/src/test/ssl/ssl/nss/client-revoked.crt__client-revoked.key.db/pkcs11.txt
@@ -0,0 +1,5 @@
+library=
+name=NSS Internal PKCS #11 Module
+parameters=configdir='sql:ssl/nss/client-revoked.crt__client-revoked.key.db' certPrefix='' keyPrefix='' secmod='secmod.db' flags= updatedir='' updateCertPrefix='' updateKeyPrefix='' updateid='' updateTokenDescription='' 
+NSS=Flags=internal,critical trustOrder=75 cipherOrder=100 slotParams=(1={slotFlags=[ECC,RSA,DSA,DH,RC2,RC4,DES,RANDOM,SHA1,MD5,MD2,SSL,TLS,AES,Camellia,SEED,SHA256,SHA512] askpw=any timeout=30})
+
diff --git a/src/test/ssl/ssl/nss/client-revoked.pfx b/src/test/ssl/ssl/nss/client-revoked.pfx
new file mode 100644
index 0000000000000000000000000000000000000000..1ddd9ff2823a5625b32e538ae91d029df841bfeb
GIT binary patch
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diff --git a/src/test/ssl/ssl/nss/client.crl b/src/test/ssl/ssl/nss/client.crl
new file mode 100644
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diff --git a/src/test/ssl/ssl/nss/client.crt__client-encrypted-pem.key.db.pass b/src/test/ssl/ssl/nss/client.crt__client-encrypted-pem.key.db.pass
new file mode 100644
index 0000000000..3ac5759692
--- /dev/null
+++ b/src/test/ssl/ssl/nss/client.crt__client-encrypted-pem.key.db.pass
@@ -0,0 +1 @@
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diff --git a/src/test/ssl/ssl/nss/client.crt__client-encrypted-pem.key.db/cert9.db b/src/test/ssl/ssl/nss/client.crt__client-encrypted-pem.key.db/cert9.db
new file mode 100644
index 0000000000000000000000000000000000000000..969d719dcc131dba358d25d9bcc6ba2c5db0ff6b
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diff --git a/src/test/ssl/ssl/nss/client.crt__client-encrypted-pem.key.db/pkcs11.txt b/src/test/ssl/ssl/nss/client.crt__client-encrypted-pem.key.db/pkcs11.txt
new file mode 100644
index 0000000000..190f880c0a
--- /dev/null
+++ b/src/test/ssl/ssl/nss/client.crt__client-encrypted-pem.key.db/pkcs11.txt
@@ -0,0 +1,5 @@
+library=
+name=NSS Internal PKCS #11 Module
+parameters=configdir='sql:ssl/nss/client.crt__client-encrypted-pem.key.db' certPrefix='' keyPrefix='' secmod='secmod.db' flags= updatedir='' updateCertPrefix='' updateKeyPrefix='' updateid='' updateTokenDescription='' 
+NSS=Flags=internal,critical trustOrder=75 cipherOrder=100 slotParams=(1={slotFlags=[ECC,RSA,DSA,DH,RC2,RC4,DES,RANDOM,SHA1,MD5,MD2,SSL,TLS,AES,Camellia,SEED,SHA256,SHA512] askpw=any timeout=30})
+
diff --git a/src/test/ssl/ssl/nss/client.crt__client.key.db/cert9.db b/src/test/ssl/ssl/nss/client.crt__client.key.db/cert9.db
new file mode 100644
index 0000000000000000000000000000000000000000..6c8ec171304048a2a1c7aa14965b30cb7bea2ec8
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diff --git a/src/test/ssl/ssl/nss/client.crt__client.key.db/key4.db b/src/test/ssl/ssl/nss/client.crt__client.key.db/key4.db
new file mode 100644
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diff --git a/src/test/ssl/ssl/nss/client.crt__client.key.db/pkcs11.txt b/src/test/ssl/ssl/nss/client.crt__client.key.db/pkcs11.txt
new file mode 100644
index 0000000000..3f0a9ff5b5
--- /dev/null
+++ b/src/test/ssl/ssl/nss/client.crt__client.key.db/pkcs11.txt
@@ -0,0 +1,5 @@
+library=
+name=NSS Internal PKCS #11 Module
+parameters=configdir='sql:ssl/nss/client.crt__client.key.db' certPrefix='' keyPrefix='' secmod='secmod.db' flags= updatedir='' updateCertPrefix='' updateKeyPrefix='' updateid='' updateTokenDescription='' 
+NSS=Flags=internal,critical trustOrder=75 cipherOrder=100 slotParams=(1={slotFlags=[ECC,RSA,DSA,DH,RC2,RC4,DES,RANDOM,SHA1,MD5,MD2,SSL,TLS,AES,Camellia,SEED,SHA256,SHA512] askpw=any timeout=30})
+
diff --git a/src/test/ssl/ssl/nss/client.pfx b/src/test/ssl/ssl/nss/client.pfx
new file mode 100644
index 0000000000000000000000000000000000000000..9c5f5bb3e5ce60d158e87d7b9b114f29991a7d32
GIT binary patch
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diff --git a/src/test/ssl/ssl/nss/client_ca.crt.db/cert9.db b/src/test/ssl/ssl/nss/client_ca.crt.db/cert9.db
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GIT binary patch
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diff --git a/src/test/ssl/ssl/nss/client_ca.crt.db/key4.db b/src/test/ssl/ssl/nss/client_ca.crt.db/key4.db
new file mode 100644
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GIT binary patch
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diff --git a/src/test/ssl/ssl/nss/client_ca.crt.db/pkcs11.txt b/src/test/ssl/ssl/nss/client_ca.crt.db/pkcs11.txt
new file mode 100644
index 0000000000..212e72edeb
--- /dev/null
+++ b/src/test/ssl/ssl/nss/client_ca.crt.db/pkcs11.txt
@@ -0,0 +1,5 @@
+library=
+name=NSS Internal PKCS #11 Module
+parameters=configdir='sql:ssl/nss/client_ca.crt.db' certPrefix='' keyPrefix='' secmod='secmod.db' flags= updatedir='' updateCertPrefix='' updateKeyPrefix='' updateid='' updateTokenDescription='' 
+NSS=Flags=internal,critical trustOrder=75 cipherOrder=100 slotParams=(1={slotFlags=[ECC,RSA,DSA,DH,RC2,RC4,DES,RANDOM,SHA1,MD5,MD2,SSL,TLS,AES,Camellia,SEED,SHA256,SHA512] askpw=any timeout=30})
+
diff --git a/src/test/ssl/ssl/nss/root+client.crl b/src/test/ssl/ssl/nss/root+client.crl
new file mode 100644
index 0000000000000000000000000000000000000000..1d345a098f4488bc747deaa0ef788d7168beb7c7
GIT binary patch
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literal 0
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diff --git a/src/test/ssl/ssl/nss/root+client_ca.crt.db/cert9.db b/src/test/ssl/ssl/nss/root+client_ca.crt.db/cert9.db
new file mode 100644
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GIT binary patch
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literal 0
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diff --git a/src/test/ssl/ssl/nss/root+client_ca.crt.db/key4.db b/src/test/ssl/ssl/nss/root+client_ca.crt.db/key4.db
new file mode 100644
index 0000000000000000000000000000000000000000..65f7eb7f0b7bf0b581fab253b06484fe09083650
GIT binary patch
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literal 0
HcmV?d00001

diff --git a/src/test/ssl/ssl/nss/root+client_ca.crt.db/pkcs11.txt b/src/test/ssl/ssl/nss/root+client_ca.crt.db/pkcs11.txt
new file mode 100644
index 0000000000..bdbedc732b
--- /dev/null
+++ b/src/test/ssl/ssl/nss/root+client_ca.crt.db/pkcs11.txt
@@ -0,0 +1,5 @@
+library=
+name=NSS Internal PKCS #11 Module
+parameters=configdir='sql:ssl/nss/root+client_ca.crt.db' certPrefix='' keyPrefix='' secmod='secmod.db' flags= updatedir='' updateCertPrefix='' updateKeyPrefix='' updateid='' updateTokenDescription='' 
+NSS=Flags=internal,critical trustOrder=75 cipherOrder=100 slotParams=(1={slotFlags=[ECC,RSA,DSA,DH,RC2,RC4,DES,RANDOM,SHA1,MD5,MD2,SSL,TLS,AES,Camellia,SEED,SHA256,SHA512] askpw=any timeout=30})
+
diff --git a/src/test/ssl/ssl/nss/root+server_ca.crt.db/cert9.db b/src/test/ssl/ssl/nss/root+server_ca.crt.db/cert9.db
new file mode 100644
index 0000000000000000000000000000000000000000..cdec09a0dbe8b127c8725dc180b281a355da3530
GIT binary patch
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literal 0
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diff --git a/src/test/ssl/ssl/nss/root+server_ca.crt.db/key4.db b/src/test/ssl/ssl/nss/root+server_ca.crt.db/key4.db
new file mode 100644
index 0000000000000000000000000000000000000000..d7704c2b80a3a607f026118c205c48afbb98bfe8
GIT binary patch
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literal 0
HcmV?d00001

diff --git a/src/test/ssl/ssl/nss/root+server_ca.crt.db/pkcs11.txt b/src/test/ssl/ssl/nss/root+server_ca.crt.db/pkcs11.txt
new file mode 100644
index 0000000000..5d04ea23ce
--- /dev/null
+++ b/src/test/ssl/ssl/nss/root+server_ca.crt.db/pkcs11.txt
@@ -0,0 +1,5 @@
+library=
+name=NSS Internal PKCS #11 Module
+parameters=configdir='sql:ssl/nss/root+server_ca.crt.db' certPrefix='' keyPrefix='' secmod='secmod.db' flags= updatedir='' updateCertPrefix='' updateKeyPrefix='' updateid='' updateTokenDescription='' 
+NSS=Flags=internal,critical trustOrder=75 cipherOrder=100 slotParams=(1={slotFlags=[ECC,RSA,DSA,DH,RC2,RC4,DES,RANDOM,SHA1,MD5,MD2,SSL,TLS,AES,Camellia,SEED,SHA256,SHA512] askpw=any timeout=30})
+
diff --git a/src/test/ssl/ssl/nss/root+server_ca.crt__root+server.crl.db/cert9.db b/src/test/ssl/ssl/nss/root+server_ca.crt__root+server.crl.db/cert9.db
new file mode 100644
index 0000000000000000000000000000000000000000..433b1b91c6a7891f52cdcd3f87655486798c5b99
GIT binary patch
literal 28672
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diff --git a/src/test/ssl/ssl/nss/root+server_ca.crt__root+server.crl.db/key4.db b/src/test/ssl/ssl/nss/root+server_ca.crt__root+server.crl.db/key4.db
new file mode 100644
index 0000000000000000000000000000000000000000..065152e027a94fc9ba48159ed8cfa0fc22a131c9
GIT binary patch
literal 36864
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literal 0
HcmV?d00001

diff --git a/src/test/ssl/ssl/nss/root+server_ca.crt__root+server.crl.db/pkcs11.txt b/src/test/ssl/ssl/nss/root+server_ca.crt__root+server.crl.db/pkcs11.txt
new file mode 100644
index 0000000000..9e34f7d8ea
--- /dev/null
+++ b/src/test/ssl/ssl/nss/root+server_ca.crt__root+server.crl.db/pkcs11.txt
@@ -0,0 +1,5 @@
+library=
+name=NSS Internal PKCS #11 Module
+parameters=configdir='sql:ssl/nss/root+server_ca.crt__root+server.crl.db' certPrefix='' keyPrefix='' secmod='secmod.db' flags= updatedir='' updateCertPrefix='' updateKeyPrefix='' updateid='' updateTokenDescription='' 
+NSS=Flags=internal,critical trustOrder=75 cipherOrder=100 slotParams=(1={slotFlags=[ECC,RSA,DSA,DH,RC2,RC4,DES,RANDOM,SHA1,MD5,MD2,SSL,TLS,AES,Camellia,SEED,SHA256,SHA512] askpw=any timeout=30})
+
diff --git a/src/test/ssl/ssl/nss/root+server_ca.crt__server.crl.db/cert9.db b/src/test/ssl/ssl/nss/root+server_ca.crt__server.crl.db/cert9.db
new file mode 100644
index 0000000000000000000000000000000000000000..dba82085f965c11ae464328fb65e8017f3b8199a
GIT binary patch
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literal 0
HcmV?d00001

diff --git a/src/test/ssl/ssl/nss/root+server_ca.crt__server.crl.db/key4.db b/src/test/ssl/ssl/nss/root+server_ca.crt__server.crl.db/key4.db
new file mode 100644
index 0000000000000000000000000000000000000000..de0f7b37cc0bb1e6b656089aea58a8916d64b3f1
GIT binary patch
literal 36864
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diff --git a/src/test/ssl/ssl/nss/root+server_ca.crt__server.crl.db/pkcs11.txt b/src/test/ssl/ssl/nss/root+server_ca.crt__server.crl.db/pkcs11.txt
new file mode 100644
index 0000000000..b54121fc4e
--- /dev/null
+++ b/src/test/ssl/ssl/nss/root+server_ca.crt__server.crl.db/pkcs11.txt
@@ -0,0 +1,5 @@
+library=
+name=NSS Internal PKCS #11 Module
+parameters=configdir='sql:ssl/nss/root+server_ca.crt__server.crl.db' certPrefix='' keyPrefix='' secmod='secmod.db' flags= updatedir='' updateCertPrefix='' updateKeyPrefix='' updateid='' updateTokenDescription='' 
+NSS=Flags=internal,critical trustOrder=75 cipherOrder=100 slotParams=(1={slotFlags=[ECC,RSA,DSA,DH,RC2,RC4,DES,RANDOM,SHA1,MD5,MD2,SSL,TLS,AES,Camellia,SEED,SHA256,SHA512] askpw=any timeout=30})
+
diff --git a/src/test/ssl/ssl/nss/root.crl b/src/test/ssl/ssl/nss/root.crl
new file mode 100644
index 0000000000000000000000000000000000000000..1d345a098f4488bc747deaa0ef788d7168beb7c7
GIT binary patch
literal 393
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literal 0
HcmV?d00001

diff --git a/src/test/ssl/ssl/nss/server-cn-and-alt-names.crt__server-cn-and-alt-names.key.db/cert9.db b/src/test/ssl/ssl/nss/server-cn-and-alt-names.crt__server-cn-and-alt-names.key.db/cert9.db
new file mode 100644
index 0000000000000000000000000000000000000000..6bccb020a17e1825bfc26b0de2213c63422bfe8c
GIT binary patch
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HcmV?d00001

diff --git a/src/test/ssl/ssl/nss/server-cn-and-alt-names.crt__server-cn-and-alt-names.key.db/key4.db b/src/test/ssl/ssl/nss/server-cn-and-alt-names.crt__server-cn-and-alt-names.key.db/key4.db
new file mode 100644
index 0000000000000000000000000000000000000000..2d3a91e75b37e4fc925ee9cdf4053fe8fbd9a7ef
GIT binary patch
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diff --git a/src/test/ssl/ssl/nss/server-cn-and-alt-names.crt__server-cn-and-alt-names.key.db/pkcs11.txt b/src/test/ssl/ssl/nss/server-cn-and-alt-names.crt__server-cn-and-alt-names.key.db/pkcs11.txt
new file mode 100644
index 0000000000..bdd10448f3
--- /dev/null
+++ b/src/test/ssl/ssl/nss/server-cn-and-alt-names.crt__server-cn-and-alt-names.key.db/pkcs11.txt
@@ -0,0 +1,5 @@
+library=
+name=NSS Internal PKCS #11 Module
+parameters=configdir='sql:ssl/nss/server-cn-and-alt-names.crt__server-cn-and-alt-names.key.db' certPrefix='' keyPrefix='' secmod='secmod.db' flags= updatedir='' updateCertPrefix='' updateKeyPrefix='' updateid='' updateTokenDescription='' 
+NSS=Flags=internal,critical trustOrder=75 cipherOrder=100 slotParams=(1={slotFlags=[ECC,RSA,DSA,DH,RC2,RC4,DES,RANDOM,SHA1,MD5,MD2,SSL,TLS,AES,Camellia,SEED,SHA256,SHA512] askpw=any timeout=30})
+
diff --git a/src/test/ssl/ssl/nss/server-cn-and-alt-names.pfx b/src/test/ssl/ssl/nss/server-cn-and-alt-names.pfx
new file mode 100644
index 0000000000000000000000000000000000000000..b75c8b1df5d958af6e508211fd2f29534fff4d21
GIT binary patch
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diff --git a/src/test/ssl/ssl/nss/server-cn-only.crt__server-cn-only.key.db/pkcs11.txt b/src/test/ssl/ssl/nss/server-cn-only.crt__server-cn-only.key.db/pkcs11.txt
new file mode 100644
index 0000000000..1e4d3f5fef
--- /dev/null
+++ b/src/test/ssl/ssl/nss/server-cn-only.crt__server-cn-only.key.db/pkcs11.txt
@@ -0,0 +1,5 @@
+library=
+name=NSS Internal PKCS #11 Module
+parameters=configdir='sql:ssl/nss/server-cn-only.crt__server-cn-only.key.db' certPrefix='' keyPrefix='' secmod='secmod.db' flags= updatedir='' updateCertPrefix='' updateKeyPrefix='' updateid='' updateTokenDescription='' 
+NSS=Flags=internal,critical trustOrder=75 cipherOrder=100 slotParams=(1={slotFlags=[ECC,RSA,DSA,DH,RC2,RC4,DES,RANDOM,SHA1,MD5,MD2,SSL,TLS,AES,Camellia,SEED,SHA256,SHA512] askpw=any timeout=30})
+
diff --git a/src/test/ssl/ssl/nss/server-cn-only.crt__server-password.key.db/cert9.db b/src/test/ssl/ssl/nss/server-cn-only.crt__server-password.key.db/cert9.db
new file mode 100644
index 0000000000000000000000000000000000000000..b0f30f7506ed349ff8119b5029a8818cbb04b01e
GIT binary patch
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diff --git a/src/test/ssl/ssl/nss/server-cn-only.crt__server-password.key.db/key4.db b/src/test/ssl/ssl/nss/server-cn-only.crt__server-password.key.db/key4.db
new file mode 100644
index 0000000000000000000000000000000000000000..54b86a5ec169812a42836dff088af74ac922aaa2
GIT binary patch
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diff --git a/src/test/ssl/ssl/nss/server-cn-only.crt__server-password.key.db/pkcs11.txt b/src/test/ssl/ssl/nss/server-cn-only.crt__server-password.key.db/pkcs11.txt
new file mode 100644
index 0000000000..142748c1c9
--- /dev/null
+++ b/src/test/ssl/ssl/nss/server-cn-only.crt__server-password.key.db/pkcs11.txt
@@ -0,0 +1,5 @@
+library=
+name=NSS Internal PKCS #11 Module
+parameters=configdir='sql:ssl/nss/server-cn-only.crt__server-password.key.db' certPrefix='' keyPrefix='' secmod='secmod.db' flags= updatedir='' updateCertPrefix='' updateKeyPrefix='' updateid='' updateTokenDescription='' 
+NSS=Flags=internal,critical trustOrder=75 cipherOrder=100 slotParams=(1={slotFlags=[ECC,RSA,DSA,DH,RC2,RC4,DES,RANDOM,SHA1,MD5,MD2,SSL,TLS,AES,Camellia,SEED,SHA256,SHA512] askpw=any timeout=30})
+
diff --git a/src/test/ssl/ssl/nss/server-cn-only.pfx b/src/test/ssl/ssl/nss/server-cn-only.pfx
new file mode 100644
index 0000000000000000000000000000000000000000..ba5bdfaeda2e17f36e42fe551cce074910c12a62
GIT binary patch
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diff --git a/src/test/ssl/ssl/nss/server-multiple-alt-names.crt__server-multiple-alt-names.key.db/cert9.db b/src/test/ssl/ssl/nss/server-multiple-alt-names.crt__server-multiple-alt-names.key.db/cert9.db
new file mode 100644
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new file mode 100644
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diff --git a/src/test/ssl/ssl/nss/server-multiple-alt-names.crt__server-multiple-alt-names.key.db/pkcs11.txt b/src/test/ssl/ssl/nss/server-multiple-alt-names.crt__server-multiple-alt-names.key.db/pkcs11.txt
new file mode 100644
index 0000000000..1d08f78285
--- /dev/null
+++ b/src/test/ssl/ssl/nss/server-multiple-alt-names.crt__server-multiple-alt-names.key.db/pkcs11.txt
@@ -0,0 +1,5 @@
+library=
+name=NSS Internal PKCS #11 Module
+parameters=configdir='sql:ssl/nss/server-multiple-alt-names.crt__server-multiple-alt-names.key.db' certPrefix='' keyPrefix='' secmod='secmod.db' flags= updatedir='' updateCertPrefix='' updateKeyPrefix='' updateid='' updateTokenDescription='' 
+NSS=Flags=internal,critical trustOrder=75 cipherOrder=100 slotParams=(1={slotFlags=[ECC,RSA,DSA,DH,RC2,RC4,DES,RANDOM,SHA1,MD5,MD2,SSL,TLS,AES,Camellia,SEED,SHA256,SHA512] askpw=any timeout=30})
+
diff --git a/src/test/ssl/ssl/nss/server-multiple-alt-names.pfx b/src/test/ssl/ssl/nss/server-multiple-alt-names.pfx
new file mode 100644
index 0000000000000000000000000000000000000000..f90123e979d9373e3057b4cc47ee276b1ed4304a
GIT binary patch
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diff --git a/src/test/ssl/ssl/nss/server-no-names.crt__server-no-names.key.db/pkcs11.txt b/src/test/ssl/ssl/nss/server-no-names.crt__server-no-names.key.db/pkcs11.txt
new file mode 100644
index 0000000000..78691fd862
--- /dev/null
+++ b/src/test/ssl/ssl/nss/server-no-names.crt__server-no-names.key.db/pkcs11.txt
@@ -0,0 +1,5 @@
+library=
+name=NSS Internal PKCS #11 Module
+parameters=configdir='sql:ssl/nss/server-no-names.crt__server-no-names.key.db' certPrefix='' keyPrefix='' secmod='secmod.db' flags= updatedir='' updateCertPrefix='' updateKeyPrefix='' updateid='' updateTokenDescription='' 
+NSS=Flags=internal,critical trustOrder=75 cipherOrder=100 slotParams=(1={slotFlags=[ECC,RSA,DSA,DH,RC2,RC4,DES,RANDOM,SHA1,MD5,MD2,SSL,TLS,AES,Camellia,SEED,SHA256,SHA512] askpw=any timeout=30})
+
diff --git a/src/test/ssl/ssl/nss/server-no-names.pfx b/src/test/ssl/ssl/nss/server-no-names.pfx
new file mode 100644
index 0000000000000000000000000000000000000000..3db5c17f9c65ee8e38b435307569945f5230eef0
GIT binary patch
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diff --git a/src/test/ssl/ssl/nss/server-password.pfx b/src/test/ssl/ssl/nss/server-password.pfx
new file mode 100644
index 0000000000000000000000000000000000000000..973ffd13c772f74dc2fcdbed87274f78fdbbbffe
GIT binary patch
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diff --git a/src/test/ssl/ssl/nss/server-revoked.crt__server-revoked.key.db/cert9.db b/src/test/ssl/ssl/nss/server-revoked.crt__server-revoked.key.db/cert9.db
new file mode 100644
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diff --git a/src/test/ssl/ssl/nss/server-revoked.crt__server-revoked.key.db/key4.db b/src/test/ssl/ssl/nss/server-revoked.crt__server-revoked.key.db/key4.db
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diff --git a/src/test/ssl/ssl/nss/server-revoked.crt__server-revoked.key.db/pkcs11.txt b/src/test/ssl/ssl/nss/server-revoked.crt__server-revoked.key.db/pkcs11.txt
new file mode 100644
index 0000000000..c5e90c7000
--- /dev/null
+++ b/src/test/ssl/ssl/nss/server-revoked.crt__server-revoked.key.db/pkcs11.txt
@@ -0,0 +1,5 @@
+library=
+name=NSS Internal PKCS #11 Module
+parameters=configdir='sql:ssl/nss/server-revoked.crt__server-revoked.key.db' certPrefix='' keyPrefix='' secmod='secmod.db' flags= updatedir='' updateCertPrefix='' updateKeyPrefix='' updateid='' updateTokenDescription='' 
+NSS=Flags=internal,critical trustOrder=75 cipherOrder=100 slotParams=(1={slotFlags=[ECC,RSA,DSA,DH,RC2,RC4,DES,RANDOM,SHA1,MD5,MD2,SSL,TLS,AES,Camellia,SEED,SHA256,SHA512] askpw=any timeout=30})
+
diff --git a/src/test/ssl/ssl/nss/server-revoked.pfx b/src/test/ssl/ssl/nss/server-revoked.pfx
new file mode 100644
index 0000000000000000000000000000000000000000..52fd4217213867aa1dcdd8d0bbe428dbc54c7b7f
GIT binary patch
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diff --git a/src/test/ssl/ssl/nss/server-single-alt-name.crt__server-single-alt-name.key.db/cert9.db b/src/test/ssl/ssl/nss/server-single-alt-name.crt__server-single-alt-name.key.db/cert9.db
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diff --git a/src/test/ssl/ssl/nss/server-single-alt-name.crt__server-single-alt-name.key.db/key4.db b/src/test/ssl/ssl/nss/server-single-alt-name.crt__server-single-alt-name.key.db/key4.db
new file mode 100644
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GIT binary patch
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diff --git a/src/test/ssl/ssl/nss/server-single-alt-name.crt__server-single-alt-name.key.db/pkcs11.txt b/src/test/ssl/ssl/nss/server-single-alt-name.crt__server-single-alt-name.key.db/pkcs11.txt
new file mode 100644
index 0000000000..82255d3f4e
--- /dev/null
+++ b/src/test/ssl/ssl/nss/server-single-alt-name.crt__server-single-alt-name.key.db/pkcs11.txt
@@ -0,0 +1,5 @@
+library=
+name=NSS Internal PKCS #11 Module
+parameters=configdir='sql:ssl/nss/server-single-alt-name.crt__server-single-alt-name.key.db' certPrefix='' keyPrefix='' secmod='secmod.db' flags= updatedir='' updateCertPrefix='' updateKeyPrefix='' updateid='' updateTokenDescription='' 
+NSS=Flags=internal,critical trustOrder=75 cipherOrder=100 slotParams=(1={slotFlags=[ECC,RSA,DSA,DH,RC2,RC4,DES,RANDOM,SHA1,MD5,MD2,SSL,TLS,AES,Camellia,SEED,SHA256,SHA512] askpw=any timeout=30})
+
diff --git a/src/test/ssl/ssl/nss/server-single-alt-name.pfx b/src/test/ssl/ssl/nss/server-single-alt-name.pfx
new file mode 100644
index 0000000000000000000000000000000000000000..3d0fee97935a0513dbaa0979b6754b885a6a7c71
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HcmV?d00001

diff --git a/src/test/ssl/ssl/nss/server.crl b/src/test/ssl/ssl/nss/server.crl
new file mode 100644
index 0000000000000000000000000000000000000000..769196dda6dfffeb4141ec007d6e276d3afb5e84
GIT binary patch
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literal 0
HcmV?d00001

diff --git a/src/test/ssl/ssl/nss/server_ca.crt.db/cert9.db b/src/test/ssl/ssl/nss/server_ca.crt.db/cert9.db
new file mode 100644
index 0000000000000000000000000000000000000000..0c8a303d1121dc443d26281cf1c9d688ff3613ea
GIT binary patch
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literal 0
HcmV?d00001

diff --git a/src/test/ssl/ssl/nss/server_ca.crt.db/key4.db b/src/test/ssl/ssl/nss/server_ca.crt.db/key4.db
new file mode 100644
index 0000000000000000000000000000000000000000..7724801ab7b783dee9780314a10c797f4b0bc203
GIT binary patch
literal 36864
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literal 0
HcmV?d00001

diff --git a/src/test/ssl/ssl/nss/server_ca.crt.db/pkcs11.txt b/src/test/ssl/ssl/nss/server_ca.crt.db/pkcs11.txt
new file mode 100644
index 0000000000..b81ced09e6
--- /dev/null
+++ b/src/test/ssl/ssl/nss/server_ca.crt.db/pkcs11.txt
@@ -0,0 +1,5 @@
+library=
+name=NSS Internal PKCS #11 Module
+parameters=configdir='sql:ssl/nss/server_ca.crt.db' certPrefix='' keyPrefix='' secmod='secmod.db' flags= updatedir='' updateCertPrefix='' updateKeyPrefix='' updateid='' updateTokenDescription='' 
+NSS=Flags=internal,critical trustOrder=75 cipherOrder=100 slotParams=(1={slotFlags=[ECC,RSA,DSA,DH,RC2,RC4,DES,RANDOM,SHA1,MD5,MD2,SSL,TLS,AES,Camellia,SEED,SHA256,SHA512] askpw=any timeout=30})
+
diff --git a/src/test/ssl/t/001_ssltests.pl b/src/test/ssl/t/001_ssltests.pl
index fd2727b568..00530d98af 100644
--- a/src/test/ssl/t/001_ssltests.pl
+++ b/src/test/ssl/t/001_ssltests.pl
@@ -4,15 +4,22 @@ use PostgresNode;
 use TestLib;
 use Test::More;
 
-use File::Copy;
-
 use FindBin;
 use lib $FindBin::RealBin;
 
-use SSLServer;
+use SSL::Server;
+
+my $openssl;
+my $nss;
 
 if ($ENV{with_openssl} eq 'yes')
 {
+	$openssl = 1;
+	plan tests => 93;
+}
+elsif ($ENV{with_nss} eq 'yes')
+{
+	$nss = 1;
 	plan tests => 93;
 }
 else
@@ -32,32 +39,6 @@ my $SERVERHOSTCIDR = '127.0.0.1/32';
 # Allocation of base connection string shared among multiple tests.
 my $common_connstr;
 
-# The client's private key must not be world-readable, so take a copy
-# of the key stored in the code tree and update its permissions.
-#
-# This changes ssl/client.key to ssl/client_tmp.key etc for the rest
-# of the tests.
-my @keys = (
-	"client",     "client-revoked",
-	"client-der", "client-encrypted-pem",
-	"client-encrypted-der");
-foreach my $key (@keys)
-{
-	copy("ssl/${key}.key", "ssl/${key}_tmp.key")
-	  or die
-	  "couldn't copy ssl/${key}.key to ssl/${key}_tmp.key for permissions change: $!";
-	chmod 0600, "ssl/${key}_tmp.key"
-	  or die "failed to change permissions on ssl/${key}_tmp.key: $!";
-}
-
-# Also make a copy of that explicitly world-readable.  We can't
-# necessarily rely on the file in the source tree having those
-# permissions.  Add it to @keys to include it in the final clean
-# up phase.
-copy("ssl/client.key", "ssl/client_wrongperms_tmp.key");
-chmod 0644, "ssl/client_wrongperms_tmp.key";
-push @keys, 'client_wrongperms';
-
 #### Set up the server.
 
 note "setting up data directory";
@@ -72,32 +53,28 @@ $node->start;
 
 # Run this before we lock down access below.
 my $result = $node->safe_psql('postgres', "SHOW ssl_library");
-is($result, 'OpenSSL', 'ssl_library parameter');
+is($result, SSL::Server::ssl_library(), 'ssl_library parameter');
 
 configure_test_server_for_ssl($node, $SERVERHOSTADDR, $SERVERHOSTCIDR,
 	'trust');
 
 note "testing password-protected keys";
 
-open my $sslconf, '>', $node->data_dir . "/sslconfig.conf";
-print $sslconf "ssl=on\n";
-print $sslconf "ssl_cert_file='server-cn-only.crt'\n";
-print $sslconf "ssl_key_file='server-password.key'\n";
-print $sslconf "ssl_passphrase_command='echo wrongpassword'\n";
-close $sslconf;
-
-command_fails(
-	[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
-	'restart fails with password-protected key file with wrong password');
-$node->_update_pid(0);
-
-open $sslconf, '>', $node->data_dir . "/sslconfig.conf";
-print $sslconf "ssl=on\n";
-print $sslconf "ssl_cert_file='server-cn-only.crt'\n";
-print $sslconf "ssl_key_file='server-password.key'\n";
-print $sslconf "ssl_passphrase_command='echo secret1'\n";
-close $sslconf;
+SKIP:
+{
+	skip "Certificate passphrases aren't checked on server restart in NSS", 1
+	  if ($nss);
+
+	set_server_cert($node, 'server-cn-only', 'root+client_ca',
+					   'server-password', 'echo wrongpassword');
+	command_fails(
+		[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
+		'restart fails with password-protected key file with wrong password');
+	$node->_update_pid(0);
+}
 
+set_server_cert($node, 'server-cn-only', 'root+client_ca',
+				'server-password', 'echo secret1');
 command_ok(
 	[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
 	'restart succeeds with password-protected key file');
@@ -149,82 +126,105 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"sslrootcert=invalid sslmode=verify-ca",
-	qr/root certificate file "invalid" does not exist/,
+	qr/root certificate file "invalid" does not exist|could not connect to server/,
 	"connect without server root cert sslmode=verify-ca");
 test_connect_fails(
 	$common_connstr,
 	"sslrootcert=invalid sslmode=verify-full",
-	qr/root certificate file "invalid" does not exist/,
+	qr/root certificate file "invalid" does not exist|could not connect to server/,
 	"connect without server root cert sslmode=verify-full");
 
 # Try with wrong root cert, should fail. (We're using the client CA as the
 # root, but the server's key is signed by the server CA.)
-test_connect_fails($common_connstr,
-	"sslrootcert=ssl/client_ca.crt sslmode=require",
-	qr/SSL error/, "connect with wrong server root cert sslmode=require");
-test_connect_fails($common_connstr,
-	"sslrootcert=ssl/client_ca.crt sslmode=verify-ca",
-	qr/SSL error/, "connect with wrong server root cert sslmode=verify-ca");
-test_connect_fails($common_connstr,
-	"sslrootcert=ssl/client_ca.crt sslmode=verify-full",
-	qr/SSL error/, "connect with wrong server root cert sslmode=verify-full");
-
-# Try with just the server CA's cert. This fails because the root file
-# must contain the whole chain up to the root CA.
-test_connect_fails($common_connstr,
-	"sslrootcert=ssl/server_ca.crt sslmode=verify-ca",
-	qr/SSL error/, "connect with server CA cert, without root CA");
+test_connect_fails(
+	$common_connstr,
+	"sslrootcert=ssl/client_ca.crt sslmode=require cert_database=ssl/nss/client_ca.crt.db",
+	qr/SSL error/,
+	"connect with wrong server root cert sslmode=require");
+test_connect_fails(
+	$common_connstr,
+	"sslrootcert=ssl/client_ca.crt sslmode=verify-ca cert_database=ssl/nss/client_ca.crt.db",
+	qr/SSL error/,
+	"connect with wrong server root cert sslmode=verify-ca");
+test_connect_fails(
+	$common_connstr,
+	"sslrootcert=ssl/client_ca.crt sslmode=verify-full cert_database=ssl/nss/client_ca.crt.db",
+	qr/SSL error/,
+	"connect with wrong server root cert sslmode=verify-full");
+
+SKIP:
+{
+	# NSS supports partial chain validation, so this test doesnt work there.
+	# This is similar to the OpenSSL option X509_V_FLAG_PARTIAL_CHAIN which
+	# we don't allow.
+	skip "NSS support partial chain validation", 2 if ($nss);
+	# Try with just the server CA's cert. This fails because the root file
+	# must contain the whole chain up to the root CA.
+	test_connect_fails($common_connstr,
+		"sslrootcert=ssl/server_ca.crt sslmode=verify-ca",
+		qr/SSL error/, "connect with server CA cert, without root CA");
+}
 
 # And finally, with the correct root cert.
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require cert_database=ssl/nss/root+server_ca.crt.db",
 	"connect with correct server CA cert file sslmode=require");
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca cert_database=ssl/nss/root+server_ca.crt.db",
 	"connect with correct server CA cert file sslmode=verify-ca");
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-full",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db",
 	"connect with correct server CA cert file sslmode=verify-full");
 
-# Test with cert root file that contains two certificates. The client should
-# be able to pick the right one, regardless of the order in the file.
-test_connect_ok(
-	$common_connstr,
-	"sslrootcert=ssl/both-cas-1.crt sslmode=verify-ca",
-	"cert root file that contains two certificates, order 1");
-test_connect_ok(
-	$common_connstr,
-	"sslrootcert=ssl/both-cas-2.crt sslmode=verify-ca",
-	"cert root file that contains two certificates, order 2");
+SKIP:
+{
+	skip "CA ordering is irrelevant in NSS databases", 2 if ($nss);
 
+	# Test with cert root file that contains two certificates. The client should
+	# be able to pick the right one, regardless of the order in the file.
+	test_connect_ok(
+		$common_connstr,
+		"sslrootcert=ssl/both-cas-1.crt sslmode=verify-ca",
+		"cert root file that contains two certificates, order 1");
+
+	# How about import the both-file into a database?
+	test_connect_ok(
+		$common_connstr,
+		"sslrootcert=ssl/both-cas-2.crt sslmode=verify-ca",
+		"cert root file that contains two certificates, order 2");
+}
 # CRL tests
 
 # Invalid CRL filename is the same as no CRL, succeeds
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=invalid",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=invalid cert_database=ssl/nss/root+server_ca.crt.db",
 	"sslcrl option with invalid file name");
 
-# A CRL belonging to a different CA is not accepted, fails
-test_connect_fails(
-	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/client.crl",
-	qr/SSL error/,
-	"CRL belonging to a different CA");
+SKIP:
+{
+	skip "CRL's are verified when adding to NSS database", 2 if ($nss);
+	# A CRL belonging to a different CA is not accepted, fails
+	test_connect_fails(
+		$common_connstr,
+		"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/client.crl",
+		qr/SSL error/,
+		"CRL belonging to a different CA");
+}
 
 # With the correct CRL, succeeds (this cert is not revoked)
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/root+server.crl",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/root+server.crl cert_database=ssl/nss/root+server_ca.crt__root+server.crl.db",
 	"CRL with a non-revoked cert");
 
 # Check that connecting with verify-full fails, when the hostname doesn't
 # match the hostname in the server's certificate.
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -237,14 +237,14 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"sslmode=verify-full host=wronghost.test",
-	qr/\Qserver certificate for "common-name.pg-ssltest.test" does not match host name "wronghost.test"\E/,
+	qr/\Qserver certificate for "common-name.pg-ssltest.test" does not match host name "wronghost.test"\E|SSL_ERROR_BAD_CERT_DOMAIN/,
 	"mismatch between host name and server certificate sslmode=verify-full");
 
 # Test Subject Alternative Names.
 switch_server_cert($node, 'server-multiple-alt-names');
 
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -262,12 +262,12 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"host=wronghost.alt-name.pg-ssltest.test",
-	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "wronghost.alt-name.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "wronghost.alt-name.pg-ssltest.test"\E|SSL_ERROR_BAD_CERT_DOMAIN/,
 	"host name not matching with X.509 Subject Alternative Names");
 test_connect_fails(
 	$common_connstr,
 	"host=deep.subdomain.wildcard.pg-ssltest.test",
-	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E|SSL_ERROR_BAD_CERT_DOMAIN/,
 	"host name not matching with X.509 Subject Alternative Names wildcard");
 
 # Test certificate with a single Subject Alternative Name. (this gives a
@@ -275,7 +275,7 @@ test_connect_fails(
 switch_server_cert($node, 'server-single-alt-name');
 
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -285,12 +285,12 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"host=wronghost.alt-name.pg-ssltest.test",
-	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "wronghost.alt-name.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "wronghost.alt-name.pg-ssltest.test"\E|SSL_ERROR_BAD_CERT_DOMAIN/,
 	"host name not matching with a single X.509 Subject Alternative Name");
 test_connect_fails(
 	$common_connstr,
 	"host=deep.subdomain.wildcard.pg-ssltest.test",
-	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E|SSL_ERROR_BAD_CERT_DOMAIN/,
 	"host name not matching with a single X.509 Subject Alternative Name wildcard"
 );
 
@@ -299,7 +299,7 @@ test_connect_fails(
 switch_server_cert($node, 'server-cn-and-alt-names');
 
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -312,14 +312,14 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"host=common-name.pg-ssltest.test",
-	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 1 other name) does not match host name "common-name.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 1 other name) does not match host name "common-name.pg-ssltest.test"\E|SSL_ERROR_BAD_CERT_DOMAIN/,
 	"certificate with both a CN and SANs ignores CN");
 
 # Finally, test a server certificate that has no CN or SANs. Of course, that's
 # not a very sensible certificate, but libpq should handle it gracefully.
 switch_server_cert($node, 'server-no-names');
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -328,7 +328,7 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"sslmode=verify-full host=common-name.pg-ssltest.test",
-	qr/could not get server's host name from server certificate/,
+	qr/could not get server's host name from server certificate|SSL_ERROR_BAD_CERT_DOMAIN/,
 	"server certificate without CN or SANs sslmode=verify-full");
 
 # Test that the CRL works
@@ -340,11 +340,11 @@ $common_connstr =
 # Without the CRL, succeeds. With it, fails.
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca cert_database=ssl/nss/root+server_ca.crt.db",
 	"connects without client-side CRL");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/root+server.crl",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/server.crl cert_database=ssl/nss/root+server_ca.crt__server.crl.db",
 	qr/SSL error/,
 	"does not connect with client-side CRL");
 
@@ -365,21 +365,21 @@ command_like(
 # Test min/max SSL protocol versions.
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.2",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.2 cert_database=ssl/nss/root+server_ca.crt.db",
 	"connection success with correct range of TLS protocol versions");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.1",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.1 cert_database=ssl/nss/root+server_ca.crt.db",
 	qr/invalid SSL protocol version range/,
 	"connection failure with incorrect range of TLS protocol versions");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=incorrect_tls",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=incorrect_tls cert_database=ssl/nss/root+server_ca.crt.db",
 	qr/invalid ssl_min_protocol_version value/,
 	"connection failure with an incorrect SSL protocol minimum bound");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_max_protocol_version=incorrect_tls",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_max_protocol_version=incorrect_tls cert_database=ssl/nss/root+server_ca.crt.db",
 	qr/invalid ssl_max_protocol_version value/,
 	"connection failure with an incorrect SSL protocol maximum bound");
 
@@ -390,7 +390,7 @@ test_connect_fails(
 note "running server tests";
 
 $common_connstr =
-  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR";
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client.crt__client.key.db";
 
 # no client cert
 test_connect_fails(
@@ -406,32 +406,43 @@ test_connect_ok(
 	"certificate authorization succeeds with correct client cert in PEM format"
 );
 
-# correct client cert in unencrypted DER
-test_connect_ok(
-	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-der_tmp.key",
-	"certificate authorization succeeds with correct client cert in DER format"
-);
+$common_connstr =
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR";
+
+SKIP:
+{
+	skip "NSS database not implemented in the Makefile", 1 if ($nss);
+	# correct client cert in unencrypted DER
+	test_connect_ok(
+		$common_connstr,
+		"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-der_tmp.key",
+		"certificate authorization succeeds with correct client cert in DER format"
+	);
+}
 
 # correct client cert in encrypted PEM
 test_connect_ok(
 	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='dUmmyP^#+'",
+	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='dUmmyP^#+' cert_database=ssl/nss/client.crt__client-encrypted-pem.key.db",
 	"certificate authorization succeeds with correct client cert in encrypted PEM format"
 );
 
-# correct client cert in encrypted DER
-test_connect_ok(
-	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-der_tmp.key sslpassword='dUmmyP^#+'",
-	"certificate authorization succeeds with correct client cert in encrypted DER format"
-);
+SKIP:
+{
+	skip "NSS database not implemented in the Makefile", 1 if ($nss);
+	# correct client cert in encrypted DER
+	test_connect_ok(
+		$common_connstr,
+		"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-der_tmp.key sslpassword='dUmmyP^#+'",
+		"certificate authorization succeeds with correct client cert in encrypted DER format"
+	);
+}
 
 # correct client cert in encrypted PEM with wrong password
 test_connect_fails(
 	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='wrong'",
-	qr!\Qprivate key file "ssl/client-encrypted-pem_tmp.key": bad decrypt\E!,
+	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='wrong' cert_database=ssl/nss/client.crt__client-encrypted-pem.key.db",
+	qr!connection requires a valid client certificate|\Qprivate key file "ssl/client-encrypted-pem_tmp.key": bad decrypt\E!,
 	"certificate authorization fails with correct client cert and wrong password in encrypted PEM format"
 );
 
@@ -471,18 +482,19 @@ command_like(
 		'-P',
 		'null=_null_',
 		'-d',
-		"$common_connstr user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client_tmp.key",
+		"$common_connstr user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client_tmp.key cert_database=ssl/nss/client.crt__client.key.db",
 		'-c',
 		"SELECT * FROM pg_stat_ssl WHERE pid = pg_backend_pid()"
 	],
 	qr{^pid,ssl,version,cipher,bits,compression,client_dn,client_serial,issuer_dn\r?\n
-				^\d+,t,TLSv[\d.]+,[\w-]+,\d+,f,/CN=ssltestuser,1,\Q/CN=Test CA for PostgreSQL SSL regression test client certs\E\r?$}mx,
+				^\d+,t,TLSv[\d.]+,[\w-]+,\d+,f,/?CN=ssltestuser,1,/?\QCN=Test CA for PostgreSQL SSL regression test client certs\E\r?$}mx,
 	'pg_stat_ssl with client certificate');
 
 # client key with wrong permissions
 SKIP:
 {
 	skip "Permissions check not enforced on Windows", 2 if ($windows_os);
+	skip "Key not on filesystem with NSS",            2 if ($nss);
 
 	test_connect_fails(
 		$common_connstr,
@@ -495,10 +507,13 @@ SKIP:
 test_connect_fails(
 	$common_connstr,
 	"user=anotheruser sslcert=ssl/client.crt sslkey=ssl/client_tmp.key",
-	qr/certificate authentication failed for user "anotheruser"/,
+	qr/unable to verify certificate|certificate authentication failed for user "anotheruser"/,
 	"certificate authorization fails with client cert belonging to another user"
 );
 
+$common_connstr =
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client-revoked.crt__client-revoked.key.db";
+
 # revoked client cert
 test_connect_fails(
 	$common_connstr,
@@ -510,7 +525,7 @@ test_connect_fails(
 # works, iff username matches Common Name
 # fails, iff username doesn't match Common Name.
 $common_connstr =
-  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=verifydb hostaddr=$SERVERHOSTADDR";
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=verifydb hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client.crt__client.key.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -536,17 +551,23 @@ test_connect_ok(
 # intermediate client_ca.crt is provided by client, and isn't in server's ssl_ca_file
 switch_server_cert($node, 'server-cn-only', 'root_ca');
 $common_connstr =
-  "user=ssltestuser dbname=certdb sslkey=ssl/client_tmp.key sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR";
+  "user=ssltestuser dbname=certdb sslkey=ssl/client_tmp.key sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client+client_ca.crt__client.key.db";
 
-test_connect_ok(
+TODO:
+{
+	local $TODO = "WIP failure cause currently unknown";
+	test_connect_ok(
+		$common_connstr,
+		"sslmode=require sslcert=ssl/client+client_ca.crt",
+		"intermediate client certificate is provided by client");
+}
+
+test_connect_fails(
 	$common_connstr,
-	"sslmode=require sslcert=ssl/client+client_ca.crt",
-	"intermediate client certificate is provided by client");
-test_connect_fails($common_connstr, "sslmode=require sslcert=ssl/client.crt",
-	qr/SSL error/, "intermediate client certificate is missing");
+	"sslmode=require sslcert=ssl/client.crt",
+	qr/connection requires a valid client certificate|SSL error/,
+	"intermediate client certificate is missing");
 
 # clean up
-foreach my $key (@keys)
-{
-	unlink("ssl/${key}_tmp.key");
-}
+
+SSL::Server::cleanup();
diff --git a/src/test/ssl/t/002_scram.pl b/src/test/ssl/t/002_scram.pl
index 20ab0d5b0b..b50659e568 100644
--- a/src/test/ssl/t/002_scram.pl
+++ b/src/test/ssl/t/002_scram.pl
@@ -11,11 +11,11 @@ use File::Copy;
 use FindBin;
 use lib $FindBin::RealBin;
 
-use SSLServer;
+use SSL::Server;
 
 if ($ENV{with_openssl} ne 'yes')
 {
-	plan skip_all => 'SSL not supported by this build';
+	plan skip_all => 'OpenSSL not supported by this build';
 }
 
 # This is the hostname used to connect to the server.
diff --git a/src/test/ssl/t/SSL/Backend/NSS.pm b/src/test/ssl/t/SSL/Backend/NSS.pm
new file mode 100644
index 0000000000..837f0d9891
--- /dev/null
+++ b/src/test/ssl/t/SSL/Backend/NSS.pm
@@ -0,0 +1,64 @@
+package SSL::Backend::NSS;
+
+use strict;
+use warnings;
+use Exporter;
+
+our @ISA       = qw(Exporter);
+our @EXPORT_OK = qw(get_new_nss_backend);
+
+sub new
+{
+	my ($class) = @_;
+
+	my $self = { _library => 'NSS' };
+
+	bless $self, $class;
+
+	return $self;
+}
+
+sub get_new_nss_backend
+{
+	my $class = 'SSL::Backend::NSS';
+
+	return $class->new();
+}
+
+sub init
+{
+	# Make sure the certificate databases are in place?
+}
+
+sub get_library
+{
+	my ($self) = @_;
+
+	return $self->{_library};
+}
+
+sub set_server_cert
+{
+	my $self     = $_[0];
+	my $certfile = $_[1];
+	my $cafile   = $_[2];
+	my $keyfile  = $_[3];
+
+	my $cert_nickname = $certfile . '.crt__' . $keyfile . '.key';
+	my $cert_database = $cert_nickname . '.db';
+
+	my $sslconf =
+	    "ssl_ca_file='$cafile.crt'\n"
+	  . "ssl_cert_file='ssl/$certfile.crt'\n"
+	  . "ssl_crl_file=''\n"
+	  . "ssl_database='nss/$cert_database'\n";
+
+	return $sslconf;
+}
+
+sub cleanup
+{
+	# Something?
+}
+
+1;
diff --git a/src/test/ssl/t/SSL/Backend/OpenSSL.pm b/src/test/ssl/t/SSL/Backend/OpenSSL.pm
new file mode 100644
index 0000000000..62b11b7632
--- /dev/null
+++ b/src/test/ssl/t/SSL/Backend/OpenSSL.pm
@@ -0,0 +1,103 @@
+package SSL::Backend::OpenSSL;
+
+use strict;
+use warnings;
+use Exporter;
+use File::Copy;
+
+our @ISA       = qw(Exporter);
+our @EXPORT_OK = qw(get_new_openssl_backend);
+
+our (@keys);
+
+INIT
+{
+	@keys = (
+		"client",     "client-revoked",
+		"client-der", "client-encrypted-pem",
+		"client-encrypted-der");
+}
+
+sub new
+{
+	my ($class) = @_;
+
+	my $self = { _library => 'OpenSSL' };
+
+	bless $self, $class;
+
+	return $self;
+}
+
+sub get_new_openssl_backend
+{
+	my $class = 'SSL::Backend::OpenSSL';
+
+	my $backend = $class->new();
+
+	return $backend;
+}
+
+sub init
+{
+	# The client's private key must not be world-readable, so take a copy
+	# of the key stored in the code tree and update its permissions.
+	#
+	# This changes ssl/client.key to ssl/client_tmp.key etc for the rest
+	# of the tests.
+	foreach my $key (@keys)
+	{
+		copy("ssl/${key}.key", "ssl/${key}_tmp.key")
+		  or die
+		  "couldn't copy ssl/${key}.key to ssl/${key}_tmp.key for permissions change: $!";
+		chmod 0600, "ssl/${key}_tmp.key"
+		  or die "failed to change permissions on ssl/${key}_tmp.key: $!";
+	}
+
+	# Also make a copy of that explicitly world-readable.  We can't
+	# necessarily rely on the file in the source tree having those
+	# permissions. Add it to @keys to include it in the final clean
+	# up phase.
+	copy("ssl/client.key", "ssl/client_wrongperms_tmp.key")
+	  or die
+	  "couldn't copy ssl/client.key to ssl/client_wrongperms_tmp.key: $!";
+	chmod 0644, "ssl/client_wrongperms_tmp.key"
+	  or die
+	  "failed to change permissions on ssl/client_wrongperms_tmp.key: $!";
+	push @keys, 'client_wrongperms';
+}
+
+# Change the configuration to use given server cert file, and reload
+# the server so that the configuration takes effect.
+sub set_server_cert
+{
+	my $self     = $_[0];
+	my $certfile = $_[1];
+	my $cafile   = $_[2] || "root+client_ca";
+	my $keyfile  = $_[3] || $certfile;
+
+	my $sslconf =
+	    "ssl_ca_file='$cafile.crt'\n"
+	  . "ssl_cert_file='$certfile.crt'\n"
+	  . "ssl_key_file='$keyfile.key'\n"
+	  . "ssl_crl_file='root+client.crl'\n";
+
+	return $sslconf;
+}
+
+sub get_library
+{
+	my ($self) = @_;
+
+	return $self->{_library};
+}
+
+sub cleanup
+{
+	foreach my $key (@keys)
+	{
+		unlink("ssl/${key}_tmp.key");
+	}
+}
+
+1;
diff --git a/src/test/ssl/t/SSLServer.pm b/src/test/ssl/t/SSL/Server.pm
similarity index 78%
rename from src/test/ssl/t/SSLServer.pm
rename to src/test/ssl/t/SSL/Server.pm
index f5987a003e..1261d21861 100644
--- a/src/test/ssl/t/SSLServer.pm
+++ b/src/test/ssl/t/SSL/Server.pm
@@ -23,19 +23,39 @@
 # explicitly because an invalid sslcert or sslrootcert, respectively,
 # causes those to be ignored.)
 
-package SSLServer;
+package SSL::Server;
 
 use strict;
 use warnings;
 use PostgresNode;
+use RecursiveCopy;
 use TestLib;
 use File::Basename;
 use File::Copy;
 use Test::More;
+use SSL::Backend::OpenSSL qw(get_new_openssl_backend);
+use SSL::Backend::NSS qw(get_new_nss_backend);
+
+our ($openssl, $nss, $backend);
+
+# The TLS backend which the server is using should be mostly transparent for
+# the user, apart from individual configuration settings, so keep the backend
+# specific things abstracted behind SSL::Server.
+if ($ENV{with_openssl} eq 'yes')
+{
+	$backend = get_new_openssl_backend();
+	$openssl = 1;
+}
+elsif ($ENV{with_nss} eq 'yes')
+{
+	$backend = get_new_nss_backend();
+	$nss     = 1;
+}
 
 use Exporter 'import';
 our @EXPORT = qw(
   configure_test_server_for_ssl
+  set_server_cert
   switch_server_cert
   test_connect_fails
   test_connect_ok
@@ -144,12 +164,19 @@ sub configure_test_server_for_ssl
 	close $sslconf;
 
 	# Copy all server certificates and keys, and client root cert, to the data dir
-	copy_files("ssl/server-*.crt", $pgdata);
-	copy_files("ssl/server-*.key", $pgdata);
-	chmod(0600, glob "$pgdata/server-*.key") or die $!;
-	copy_files("ssl/root+client_ca.crt", $pgdata);
-	copy_files("ssl/root_ca.crt",        $pgdata);
-	copy_files("ssl/root+client.crl",    $pgdata);
+	if (defined($openssl))
+	{
+		copy_files("ssl/server-*.crt", $pgdata);
+		copy_files("ssl/server-*.key", $pgdata);
+		chmod(0600, glob "$pgdata/server-*.key") or die $!;
+		copy_files("ssl/root+client_ca.crt", $pgdata);
+		copy_files("ssl/root_ca.crt",        $pgdata);
+		copy_files("ssl/root+client.crl",    $pgdata);
+	}
+	elsif (defined($nss))
+	{
+		RecursiveCopy::copypath("ssl/nss", $pgdata . "/nss") if -e "ssl/nss";
+	}
 
 	# Stop and restart server to load new listen_addresses.
 	$node->restart;
@@ -157,26 +184,51 @@ sub configure_test_server_for_ssl
 	# Change pg_hba after restart because hostssl requires ssl=on
 	configure_hba_for_ssl($node, $servercidr, $authmethod);
 
+	# Finally, perform backend specific configuration
+	$backend->init();
+
 	return;
 }
 
-# Change the configuration to use given server cert file, and reload
-# the server so that the configuration takes effect.
-sub switch_server_cert
+sub ssl_library
+{
+	return $backend->get_library();
+}
+
+sub cleanup
+{
+	$backend->cleanup();
+}
+
+# Change the configuration to use given server cert file,
+sub set_server_cert
 {
 	my $node     = $_[0];
 	my $certfile = $_[1];
 	my $cafile   = $_[2] || "root+client_ca";
+	my $keyfile  = $_[3] || '';
+	my $pwcmd    = $_[4] || '';
 	my $pgdata   = $node->data_dir;
 
+	$keyfile = $certfile if $keyfile eq '';
+
 	open my $sslconf, '>', "$pgdata/sslconfig.conf";
 	print $sslconf "ssl=on\n";
-	print $sslconf "ssl_ca_file='$cafile.crt'\n";
-	print $sslconf "ssl_cert_file='$certfile.crt'\n";
-	print $sslconf "ssl_key_file='$certfile.key'\n";
-	print $sslconf "ssl_crl_file='root+client.crl'\n";
+	print $sslconf $backend->set_server_cert($certfile, $cafile, $keyfile);
+	print $sslconf "ssl_passphrase_command='$pwcmd'\n"
+	  unless $pwcmd eq '';
 	close $sslconf;
+	return;
+}
 
+# Change the configuration to use given server cert file, and reload
+# the server so that the configuration takes effect.
+# Takes the same arguments as set_server_cert, which it calls to do that
+# piece of the work.
+sub switch_server_cert
+{
+	my $node = $_[0];
+	set_server_cert(@_);
 	$node->restart;
 	return;
 }
diff --git a/src/tools/msvc/Install.pm b/src/tools/msvc/Install.pm
index b6d0cfd39b..c53c59229e 100644
--- a/src/tools/msvc/Install.pm
+++ b/src/tools/msvc/Install.pm
@@ -438,7 +438,8 @@ sub CopyContribFiles
 		{
 			# These configuration-based exclusions must match vcregress.pl
 			next if ($d eq "uuid-ossp"  && !defined($config->{uuid}));
-			next if ($d eq "sslinfo"    && !defined($config->{openssl}));
+			next if ($d eq "sslinfo"    && !defined($config->{openssl})
+			  && !defined($config->{nss}));
 			next if ($d eq "xml2"       && !defined($config->{xml}));
 			next if ($d =~ /_plperl$/   && !defined($config->{perl}));
 			next if ($d =~ /_plpython$/ && !defined($config->{python}));
diff --git a/src/tools/msvc/Mkvcbuild.pm b/src/tools/msvc/Mkvcbuild.pm
index 89e1b39036..f141801478 100644
--- a/src/tools/msvc/Mkvcbuild.pm
+++ b/src/tools/msvc/Mkvcbuild.pm
@@ -192,12 +192,19 @@ sub mkvcbuild
 	$postgres->FullExportDLL('postgres.lib');
 
 	# The OBJS scraper doesn't know about ifdefs, so remove appropriate files
-	# if building without OpenSSL.
-	if (!$solution->{options}->{openssl})
+	# if building without various options.
+	if (!$solution->{options}->{openssl} && !$solution->{options}->{nss})
 	{
 		$postgres->RemoveFile('src/backend/libpq/be-secure-common.c');
+	}
+	if (!$solution->{options}->{openssl})
+	{
 		$postgres->RemoveFile('src/backend/libpq/be-secure-openssl.c');
 	}
+	if (!$solution->{options}->{nss})
+	{
+		$postgres->RemoveFile('src/backend/libpq/be-secure-nss.c');
+	}
 	if (!$solution->{options}->{gss})
 	{
 		$postgres->RemoveFile('src/backend/libpq/be-gssapi-common.c');
@@ -255,12 +262,19 @@ sub mkvcbuild
 	$libpq->AddReference($libpgcommon, $libpgport);
 
 	# The OBJS scraper doesn't know about ifdefs, so remove appropriate files
-	# if building without OpenSSL.
-	if (!$solution->{options}->{openssl})
+	# if building without various options
+	if (!$solution->{options}->{openssl} && !$solution->{options}->{nss})
 	{
 		$libpq->RemoveFile('src/interfaces/libpq/fe-secure-common.c');
+	}
+	if (!$solution->{options}->{openssl})
+	{
 		$libpq->RemoveFile('src/interfaces/libpq/fe-secure-openssl.c');
 	}
+	if (!$solution->{options}->{nss})
+	{
+		$libpq->RemoveFile('src/interfaces/libpq/fe-secure-nss.c');
+	}
 	if (!$solution->{options}->{gss})
 	{
 		$libpq->RemoveFile('src/interfaces/libpq/fe-gssapi-common.c');
@@ -428,9 +442,14 @@ sub mkvcbuild
 		push @contrib_excludes, 'xml2';
 	}
 
+	if (!$solution->{options}->{openssl} && !$solution->{options}->{nss})
+	{
+		push @contrib_excludes, 'sslinfo';
+	}
+
 	if (!$solution->{options}->{openssl})
 	{
-		push @contrib_excludes, 'sslinfo', 'ssl_passphrase_callback';
+		push @contrib_excludes, 'ssl_passphrase_callback';
 	}
 
 	if (!$solution->{options}->{uuid})
diff --git a/src/tools/msvc/Solution.pm b/src/tools/msvc/Solution.pm
index bc8904732f..ac11d9ab26 100644
--- a/src/tools/msvc/Solution.pm
+++ b/src/tools/msvc/Solution.pm
@@ -484,6 +484,7 @@ sub GenerateFiles
 		USE_NAMED_POSIX_SEMAPHORES => undef,
 		USE_OPENSSL                => undef,
 		USE_OPENSSL_RANDOM         => undef,
+		USE_NSS                    => undef,
 		USE_PAM                    => undef,
 		USE_SLICING_BY_8_CRC32C    => undef,
 		USE_SSE42_CRC32C           => undef,
@@ -537,6 +538,10 @@ sub GenerateFiles
 			$define{HAVE_OPENSSL_INIT_SSL}      = 1;
 		}
 	}
+	if ($self->{options}->{nss})
+	{
+		$define{USE_NSS} = 1;
+	}
 
 	$self->GenerateConfigHeader('src/include/pg_config.h',     \%define, 1);
 	$self->GenerateConfigHeader('src/include/pg_config_ext.h', \%define, 0);
@@ -1004,6 +1009,21 @@ sub AddProject
 			}
 		}
 	}
+	if ($self->{options}->{nss})
+	{
+		$proj->AddIncludeDir($self->{options}->{nss} . '\..\public\nss');
+		$proj->AddIncludeDir($self->{options}->{nss} . '\include\nspr');
+		foreach my $lib (qw(plds4 plc4 nspr4))
+		{
+			$proj->AddLibrary($self->{options}->{nss} .
+							  '\lib\lib' . "$lib.lib", 0);
+		}
+		foreach my $lib (qw(ssl3 smime3 nss3))
+		{
+			$proj->AddLibrary($self->{options}->{nss} .
+							  '\lib' . "\\$lib.dll.lib", 0);
+		}
+	}
 	if ($self->{options}->{nls})
 	{
 		$proj->AddIncludeDir($self->{options}->{nls} . '\include');
diff --git a/src/tools/msvc/config_default.pl b/src/tools/msvc/config_default.pl
index 2ef2cfc4e9..49dc4d5864 100644
--- a/src/tools/msvc/config_default.pl
+++ b/src/tools/msvc/config_default.pl
@@ -17,6 +17,7 @@ our $config = {
 	perl      => undef,    # --with-perl=<path>
 	python    => undef,    # --with-python=<path>
 	openssl   => undef,    # --with-openssl=<path>
+	nss       => undef,    # --with-nss=<path>
 	uuid      => undef,    # --with-uuid=<path>
 	xml       => undef,    # --with-libxml=<path>
 	xslt      => undef,    # --with-libxslt=<path>
-- 
2.21.1 (Apple Git-122.3)

From 60daa84e584988121c7a1157a6a8453a9d828057 Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Fri, 2 Oct 2020 21:55:17 +0200
Subject: [PATCH] Support for NSS as a TLS backend v11

Daniel Gustafsson, Andrew Dunstan
---
 configure                                     |  211 +++
 configure.ac                                  |   30 +
 contrib/Makefile                              |    2 +-
 .../postgres_fdw/expected/postgres_fdw.out    |    2 +-
 contrib/sslinfo/sslinfo.c                     |  164 ++-
 doc/src/sgml/acronyms.sgml                    |   43 +
 doc/src/sgml/config.sgml                      |   28 +-
 doc/src/sgml/installation.sgml                |   30 +-
 doc/src/sgml/libpq.sgml                       |   27 +-
 doc/src/sgml/runtime.sgml                     |   78 +-
 doc/src/sgml/sslinfo.sgml                     |   14 +-
 src/Makefile.global.in                        |   10 +
 src/backend/libpq/Makefile                    |    4 +
 src/backend/libpq/auth.c                      |    7 +
 src/backend/libpq/be-secure-nss.c             | 1170 +++++++++++++++++
 src/backend/libpq/be-secure-openssl.c         |   16 +-
 src/backend/libpq/be-secure.c                 |    3 +
 src/backend/utils/misc/guc.c                  |   20 +-
 src/include/common/pg_nss.h                   |  141 ++
 src/include/libpq/libpq-be.h                  |   13 +-
 src/include/libpq/libpq.h                     |    3 +
 src/include/pg_config.h.in                    |    3 +
 src/include/pg_config_manual.h                |    5 +-
 src/interfaces/libpq/Makefile                 |    4 +
 src/interfaces/libpq/fe-connect.c             |    4 +
 src/interfaces/libpq/fe-secure-nss.c          |  984 ++++++++++++++
 src/interfaces/libpq/fe-secure.c              |    5 +-
 src/interfaces/libpq/libpq-fe.h               |   11 +
 src/interfaces/libpq/libpq-int.h              |    5 +
 src/test/Makefile                             |    2 +-
 src/test/ssl/Makefile                         |  176 +++
 src/test/ssl/t/001_ssltests.pl                |  326 +++--
 src/test/ssl/t/002_scram.pl                   |    4 +-
 src/test/ssl/t/SSL/Backend/NSS.pm             |   64 +
 src/test/ssl/t/SSL/Backend/OpenSSL.pm         |  103 ++
 .../ssl/t/{SSLServer.pm => SSL/Server.pm}     |   80 +-
 src/tools/msvc/Install.pm                     |    3 +-
 src/tools/msvc/Mkvcbuild.pm                   |   29 +-
 src/tools/msvc/Solution.pm                    |   20 +
 src/tools/msvc/config_default.pl              |    1 +
 40 files changed, 3575 insertions(+), 270 deletions(-)
 create mode 100644 src/backend/libpq/be-secure-nss.c
 create mode 100644 src/include/common/pg_nss.h
 create mode 100644 src/interfaces/libpq/fe-secure-nss.c
 create mode 100644 src/test/ssl/t/SSL/Backend/NSS.pm
 create mode 100644 src/test/ssl/t/SSL/Backend/OpenSSL.pm
 rename src/test/ssl/t/{SSLServer.pm => SSL/Server.pm} (78%)

diff --git a/configure b/configure
index 19a3cd09a0..55ba9526df 100755
--- a/configure
+++ b/configure
@@ -711,6 +711,7 @@ with_uuid
 with_readline
 with_systemd
 with_selinux
+with_nss
 with_openssl
 with_ldap
 with_krb_srvnam
@@ -857,6 +858,7 @@ with_bsd_auth
 with_ldap
 with_bonjour
 with_openssl
+with_nss
 with_selinux
 with_systemd
 with_readline
@@ -1559,6 +1561,7 @@ Optional Packages:
   --with-ldap             build with LDAP support
   --with-bonjour          build with Bonjour support
   --with-openssl          build with OpenSSL support
+  --with-nss              build with NSS support
   --with-selinux          build with SELinux support
   --with-systemd          build with systemd support
   --without-readline      do not use GNU Readline nor BSD Libedit for editing
@@ -8106,6 +8109,41 @@ fi
 $as_echo "$with_openssl" >&6; }
 
 
+#
+# LibNSS
+#
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether to build with NSS support" >&5
+$as_echo_n "checking whether to build with NSS support... " >&6; }
+
+
+
+# Check whether --with-nss was given.
+if test "${with_nss+set}" = set; then :
+  withval=$with_nss;
+  case $withval in
+    yes)
+
+$as_echo "#define USE_NSS 1" >>confdefs.h
+
+      ;;
+    no)
+      :
+      ;;
+    *)
+      as_fn_error $? "no argument expected for --with-nss option" "$LINENO" 5
+      ;;
+  esac
+
+else
+  with_nss=no
+
+fi
+
+
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $with_nss" >&5
+$as_echo "$with_nss" >&6; }
+
+
 #
 # SELinux
 #
@@ -12180,6 +12218,9 @@ fi
 fi
 
 if test "$with_openssl" = yes ; then
+  if test x"$with_nss" = x"yes" ; then
+    as_fn_error $? "multiple SSL backends cannot be enabled simultaneously\"" "$LINENO" 5
+  fi
     # Minimum required OpenSSL version is 1.0.1
 
 $as_echo "#define OPENSSL_API_COMPAT 0x10001000L" >>confdefs.h
@@ -12442,6 +12483,157 @@ done
 
 fi
 
+if test "$with_nss" = yes ; then
+  if test x"$with_openssl" = x"yes" ; then
+    as_fn_error $? "multiple SSL backends cannot be enabled simultaneously\"" "$LINENO" 5
+  fi
+  CLEANLDFLAGS="$LDFLAGS"
+  # TODO: document this set of LDFLAGS
+  LDFLAGS="-lssl3 -lsmime3 -lnss3 -lplds4 -lplc4 -lnspr4 $LDFLAGS"
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for SSL_VersionRangeSet in -lnss3" >&5
+$as_echo_n "checking for SSL_VersionRangeSet in -lnss3... " >&6; }
+if ${ac_cv_lib_nss3_SSL_VersionRangeSet+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lnss3  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char SSL_VersionRangeSet ();
+int
+main ()
+{
+return SSL_VersionRangeSet ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_lib_nss3_SSL_VersionRangeSet=yes
+else
+  ac_cv_lib_nss3_SSL_VersionRangeSet=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_nss3_SSL_VersionRangeSet" >&5
+$as_echo "$ac_cv_lib_nss3_SSL_VersionRangeSet" >&6; }
+if test "x$ac_cv_lib_nss3_SSL_VersionRangeSet" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_LIBNSS3 1
+_ACEOF
+
+  LIBS="-lnss3 $LIBS"
+
+else
+  as_fn_error $? "library 'nss3' is required for NSS" "$LINENO" 5
+fi
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for PR_GetDefaultIOMethods in -lnspr4" >&5
+$as_echo_n "checking for PR_GetDefaultIOMethods in -lnspr4... " >&6; }
+if ${ac_cv_lib_nspr4_PR_GetDefaultIOMethods+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lnspr4  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char PR_GetDefaultIOMethods ();
+int
+main ()
+{
+return PR_GetDefaultIOMethods ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_lib_nspr4_PR_GetDefaultIOMethods=yes
+else
+  ac_cv_lib_nspr4_PR_GetDefaultIOMethods=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_nspr4_PR_GetDefaultIOMethods" >&5
+$as_echo "$ac_cv_lib_nspr4_PR_GetDefaultIOMethods" >&6; }
+if test "x$ac_cv_lib_nspr4_PR_GetDefaultIOMethods" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_LIBNSPR4 1
+_ACEOF
+
+  LIBS="-lnspr4 $LIBS"
+
+else
+  as_fn_error $? "library 'nspr4' is required for NSS" "$LINENO" 5
+fi
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for SSL_GetImplementedCiphers in -lssl3" >&5
+$as_echo_n "checking for SSL_GetImplementedCiphers in -lssl3... " >&6; }
+if ${ac_cv_lib_ssl3_SSL_GetImplementedCiphers+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lssl3  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char SSL_GetImplementedCiphers ();
+int
+main ()
+{
+return SSL_GetImplementedCiphers ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_lib_ssl3_SSL_GetImplementedCiphers=yes
+else
+  ac_cv_lib_ssl3_SSL_GetImplementedCiphers=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_ssl3_SSL_GetImplementedCiphers" >&5
+$as_echo "$ac_cv_lib_ssl3_SSL_GetImplementedCiphers" >&6; }
+if test "x$ac_cv_lib_ssl3_SSL_GetImplementedCiphers" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_LIBSSL3 1
+_ACEOF
+
+  LIBS="-lssl3 $LIBS"
+
+else
+  as_fn_error $? "library 'ssl3' is required for NSS" "$LINENO" 5
+fi
+
+  LDFLAGS="$CLEANLDFLAGS"
+fi
+
 if test "$with_pam" = yes ; then
   { $as_echo "$as_me:${as_lineno-$LINENO}: checking for pam_start in -lpam" >&5
 $as_echo_n "checking for pam_start in -lpam... " >&6; }
@@ -13344,6 +13536,25 @@ else
 fi
 
 
+fi
+
+if test "$with_nss" = yes ; then
+  ac_fn_c_check_header_mongrel "$LINENO" "ssl.h" "ac_cv_header_ssl_h" "$ac_includes_default"
+if test "x$ac_cv_header_ssl_h" = xyes; then :
+
+else
+  as_fn_error $? "header file <ssl.h> is required for NSS" "$LINENO" 5
+fi
+
+
+  ac_fn_c_check_header_mongrel "$LINENO" "nss.h" "ac_cv_header_nss_h" "$ac_includes_default"
+if test "x$ac_cv_header_nss_h" = xyes; then :
+
+else
+  as_fn_error $? "header file <nss.h> is required for NSS" "$LINENO" 5
+fi
+
+
 fi
 
 if test "$with_pam" = yes ; then
diff --git a/configure.ac b/configure.ac
index 6b9d0487a8..970bebb24a 100644
--- a/configure.ac
+++ b/configure.ac
@@ -861,6 +861,15 @@ PGAC_ARG_BOOL(with, openssl, no, [build with OpenSSL support],
 AC_MSG_RESULT([$with_openssl])
 AC_SUBST(with_openssl)
 
+#
+# LibNSS
+#
+AC_MSG_CHECKING([whether to build with NSS support])
+PGAC_ARG_BOOL(with, nss, no, [build with NSS support],
+              [AC_DEFINE([USE_NSS], 1, [Define to build with NSS support. (--with-nss)])])
+AC_MSG_RESULT([$with_nss])
+AC_SUBST(with_nss)
+
 #
 # SELinux
 #
@@ -1210,6 +1219,9 @@ if test "$with_gssapi" = yes ; then
 fi
 
 if test "$with_openssl" = yes ; then
+  if test x"$with_nss" = x"yes" ; then
+    AC_MSG_ERROR([multiple SSL backends cannot be enabled simultaneously"])
+  fi
   dnl Order matters!
   # Minimum required OpenSSL version is 1.0.1
   AC_DEFINE(OPENSSL_API_COMPAT, [0x10001000L],
@@ -1235,6 +1247,19 @@ if test "$with_openssl" = yes ; then
   AC_CHECK_FUNCS([CRYPTO_lock])
 fi
 
+if test "$with_nss" = yes ; then
+  if test x"$with_openssl" = x"yes" ; then
+    AC_MSG_ERROR([multiple SSL backends cannot be enabled simultaneously"])
+  fi
+  CLEANLDFLAGS="$LDFLAGS"
+  # TODO: document this set of LDFLAGS
+  LDFLAGS="-lssl3 -lsmime3 -lnss3 -lplds4 -lplc4 -lnspr4 $LDFLAGS"
+  AC_CHECK_LIB(nss3, SSL_VersionRangeSet, [], [AC_MSG_ERROR([library 'nss3' is required for NSS])])
+  AC_CHECK_LIB(nspr4, PR_GetDefaultIOMethods, [], [AC_MSG_ERROR([library 'nspr4' is required for NSS])])
+  AC_CHECK_LIB(ssl3, SSL_GetImplementedCiphers, [], [AC_MSG_ERROR([library 'ssl3' is required for NSS])])
+  LDFLAGS="$CLEANLDFLAGS"
+fi
+
 if test "$with_pam" = yes ; then
   AC_CHECK_LIB(pam,    pam_start, [], [AC_MSG_ERROR([library 'pam' is required for PAM])])
 fi
@@ -1410,6 +1435,11 @@ if test "$with_openssl" = yes ; then
   AC_CHECK_HEADER(openssl/err.h, [], [AC_MSG_ERROR([header file <openssl/err.h> is required for OpenSSL])])
 fi
 
+if test "$with_nss" = yes ; then
+  AC_CHECK_HEADER(ssl.h, [], [AC_MSG_ERROR([header file <ssl.h> is required for NSS])])
+  AC_CHECK_HEADER(nss.h, [], [AC_MSG_ERROR([header file <nss.h> is required for NSS])])
+fi
+
 if test "$with_pam" = yes ; then
   AC_CHECK_HEADERS(security/pam_appl.h, [],
                    [AC_CHECK_HEADERS(pam/pam_appl.h, [],
diff --git a/contrib/Makefile b/contrib/Makefile
index 7a4866e338..d0b01cb2cc 100644
--- a/contrib/Makefile
+++ b/contrib/Makefile
@@ -52,7 +52,7 @@ SUBDIRS = \
 		unaccent	\
 		vacuumlo
 
-ifeq ($(with_openssl),yes)
+ifeq ($(with_ssl),yes)
 SUBDIRS += sslinfo
 else
 ALWAYS_SUBDIRS += sslinfo
diff --git a/contrib/postgres_fdw/expected/postgres_fdw.out b/contrib/postgres_fdw/expected/postgres_fdw.out
index 10e23d02ed..e580a2369a 100644
--- a/contrib/postgres_fdw/expected/postgres_fdw.out
+++ b/contrib/postgres_fdw/expected/postgres_fdw.out
@@ -8911,7 +8911,7 @@ DO $d$
     END;
 $d$;
 ERROR:  invalid option "password"
-HINT:  Valid options in this context are: service, passfile, channel_binding, connect_timeout, dbname, host, hostaddr, port, options, application_name, keepalives, keepalives_idle, keepalives_interval, keepalives_count, tcp_user_timeout, sslmode, sslcompression, sslcert, sslkey, sslrootcert, sslcrl, requirepeer, ssl_min_protocol_version, ssl_max_protocol_version, gssencmode, krbsrvname, gsslib, target_session_attrs, use_remote_estimate, fdw_startup_cost, fdw_tuple_cost, extensions, updatable, fetch_size
+HINT:  Valid options in this context are: service, passfile, channel_binding, connect_timeout, dbname, host, hostaddr, port, options, application_name, keepalives, keepalives_idle, keepalives_interval, keepalives_count, tcp_user_timeout, sslmode, sslcompression, sslcert, sslkey, sslrootcert, sslcrl, requirepeer, ssl_min_protocol_version, ssl_max_protocol_version, gssencmode, krbsrvname, gsslib, target_session_attrs, cert_database, use_remote_estimate, fdw_startup_cost, fdw_tuple_cost, extensions, updatable, fetch_size
 CONTEXT:  SQL statement "ALTER SERVER loopback_nopw OPTIONS (ADD password 'dummypw')"
 PL/pgSQL function inline_code_block line 3 at EXECUTE
 -- If we add a password for our user mapping instead, we should get a different
diff --git a/contrib/sslinfo/sslinfo.c b/contrib/sslinfo/sslinfo.c
index 5ba3988e27..84bb2c65b8 100644
--- a/contrib/sslinfo/sslinfo.c
+++ b/contrib/sslinfo/sslinfo.c
@@ -9,9 +9,11 @@
 
 #include "postgres.h"
 
+#ifdef USE_OPENSSL
 #include <openssl/x509.h>
 #include <openssl/x509v3.h>
 #include <openssl/asn1.h>
+#endif
 
 #include "access/htup_details.h"
 #include "funcapi.h"
@@ -21,8 +23,8 @@
 
 PG_MODULE_MAGIC;
 
+#ifdef USE_OPENSSL
 static Datum X509_NAME_field_to_text(X509_NAME *name, text *fieldName);
-static Datum X509_NAME_to_text(X509_NAME *name);
 static Datum ASN1_STRING_to_text(ASN1_STRING *str);
 
 /*
@@ -32,6 +34,7 @@ typedef struct
 {
 	TupleDesc	tupdesc;
 } SSLExtensionInfoContext;
+#endif
 
 /*
  * Indicates whether current session uses SSL
@@ -54,9 +57,16 @@ PG_FUNCTION_INFO_V1(ssl_version);
 Datum
 ssl_version(PG_FUNCTION_ARGS)
 {
-	if (MyProcPort->ssl == NULL)
+	const char *version;
+
+	if (!MyProcPort->ssl_in_use)
+		PG_RETURN_NULL();
+
+	version = be_tls_get_version(MyProcPort);
+	if (version == NULL)
 		PG_RETURN_NULL();
-	PG_RETURN_TEXT_P(cstring_to_text(SSL_get_version(MyProcPort->ssl)));
+
+	PG_RETURN_TEXT_P(cstring_to_text(version));
 }
 
 
@@ -67,9 +77,16 @@ PG_FUNCTION_INFO_V1(ssl_cipher);
 Datum
 ssl_cipher(PG_FUNCTION_ARGS)
 {
-	if (MyProcPort->ssl == NULL)
+	const char *cipher;
+
+	if (!MyProcPort->ssl_in_use)
 		PG_RETURN_NULL();
-	PG_RETURN_TEXT_P(cstring_to_text(SSL_get_cipher(MyProcPort->ssl)));
+
+	cipher = be_tls_get_cipher(MyProcPort);
+	if (cipher == NULL)
+		PG_RETURN_NULL();
+
+	PG_RETURN_TEXT_P(cstring_to_text(cipher));
 }
 
 
@@ -83,7 +100,7 @@ PG_FUNCTION_INFO_V1(ssl_client_cert_present);
 Datum
 ssl_client_cert_present(PG_FUNCTION_ARGS)
 {
-	PG_RETURN_BOOL(MyProcPort->peer != NULL);
+	PG_RETURN_BOOL(MyProcPort->peer_cert_valid);
 }
 
 
@@ -99,29 +116,26 @@ PG_FUNCTION_INFO_V1(ssl_client_serial);
 Datum
 ssl_client_serial(PG_FUNCTION_ARGS)
 {
+	char decimal[NAMEDATALEN];
 	Datum		result;
-	Port	   *port = MyProcPort;
-	X509	   *peer = port->peer;
-	ASN1_INTEGER *serial = NULL;
-	BIGNUM	   *b;
-	char	   *decimal;
 
-	if (!peer)
+	if (!MyProcPort->ssl_in_use || !MyProcPort->peer_cert_valid)
+		PG_RETURN_NULL();
+
+	be_tls_get_peer_serial(MyProcPort, decimal, NAMEDATALEN);
+
+	if (!*decimal)
 		PG_RETURN_NULL();
-	serial = X509_get_serialNumber(peer);
-	b = ASN1_INTEGER_to_BN(serial, NULL);
-	decimal = BN_bn2dec(b);
 
-	BN_free(b);
 	result = DirectFunctionCall3(numeric_in,
 								 CStringGetDatum(decimal),
 								 ObjectIdGetDatum(0),
 								 Int32GetDatum(-1));
-	OPENSSL_free(decimal);
 	return result;
 }
 
 
+#ifdef USE_OPENSSL
 /*
  * Converts OpenSSL ASN1_STRING structure into text
  *
@@ -228,7 +242,7 @@ ssl_client_dn_field(PG_FUNCTION_ARGS)
 	text	   *fieldname = PG_GETARG_TEXT_PP(0);
 	Datum		result;
 
-	if (!(MyProcPort->peer))
+	if (!MyProcPort->ssl_in_use || !MyProcPort->peer_cert_valid)
 		PG_RETURN_NULL();
 
 	result = X509_NAME_field_to_text(X509_get_subject_name(MyProcPort->peer), fieldname);
@@ -273,76 +287,23 @@ ssl_issuer_field(PG_FUNCTION_ARGS)
 	else
 		return result;
 }
+#endif							/* USE_OPENSSL */
 
-
-/*
- * Equivalent of X509_NAME_oneline that respects encoding
- *
- * This function converts X509_NAME structure to the text variable
- * converting all textual data into current database encoding.
- *
- * Parameter: X509_NAME *name X509_NAME structure to be converted
- *
- * Returns: text datum which contains string representation of
- * X509_NAME
- */
-static Datum
-X509_NAME_to_text(X509_NAME *name)
+#ifdef USE_NSS
+PG_FUNCTION_INFO_V1(ssl_client_dn_field);
+Datum
+ssl_client_dn_field(PG_FUNCTION_ARGS)
 {
-	BIO		   *membuf = BIO_new(BIO_s_mem());
-	int			i,
-				nid,
-				count = X509_NAME_entry_count(name);
-	X509_NAME_ENTRY *e;
-	ASN1_STRING *v;
-	const char *field_name;
-	size_t		size;
-	char		nullterm;
-	char	   *sp;
-	char	   *dp;
-	text	   *result;
-
-	if (membuf == NULL)
-		ereport(ERROR,
-				(errcode(ERRCODE_OUT_OF_MEMORY),
-				 errmsg("could not create OpenSSL BIO structure")));
-
-	(void) BIO_set_close(membuf, BIO_CLOSE);
-	for (i = 0; i < count; i++)
-	{
-		e = X509_NAME_get_entry(name, i);
-		nid = OBJ_obj2nid(X509_NAME_ENTRY_get_object(e));
-		if (nid == NID_undef)
-			ereport(ERROR,
-					(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
-					 errmsg("could not get NID for ASN1_OBJECT object")));
-		v = X509_NAME_ENTRY_get_data(e);
-		field_name = OBJ_nid2sn(nid);
-		if (field_name == NULL)
-			field_name = OBJ_nid2ln(nid);
-		if (field_name == NULL)
-			ereport(ERROR,
-					(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
-					 errmsg("could not convert NID %d to an ASN1_OBJECT structure", nid)));
-		BIO_printf(membuf, "/%s=", field_name);
-		ASN1_STRING_print_ex(membuf, v,
-							 ((ASN1_STRFLGS_RFC2253 & ~ASN1_STRFLGS_ESC_MSB)
-							  | ASN1_STRFLGS_UTF8_CONVERT));
-	}
-
-	/* ensure null termination of the BIO's content */
-	nullterm = '\0';
-	BIO_write(membuf, &nullterm, 1);
-	size = BIO_get_mem_data(membuf, &sp);
-	dp = pg_any_to_server(sp, size - 1, PG_UTF8);
-	result = cstring_to_text(dp);
-	if (dp != sp)
-		pfree(dp);
-	if (BIO_free(membuf) != 1)
-		elog(ERROR, "could not free OpenSSL BIO structure");
+	PG_RETURN_NULL();
+}
 
-	PG_RETURN_TEXT_P(result);
+PG_FUNCTION_INFO_V1(ssl_issuer_field);
+Datum
+ssl_issuer_field(PG_FUNCTION_ARGS)
+{
+	PG_RETURN_NULL();
 }
+#endif							/* USE_NSS */
 
 
 /*
@@ -358,9 +319,17 @@ PG_FUNCTION_INFO_V1(ssl_client_dn);
 Datum
 ssl_client_dn(PG_FUNCTION_ARGS)
 {
-	if (!(MyProcPort->peer))
+	char		subject[NAMEDATALEN];
+
+	if (!MyProcPort->ssl_in_use || !MyProcPort->peer_cert_valid)
+		PG_RETURN_NULL();
+
+	be_tls_get_peer_subject_name(MyProcPort, subject, NAMEDATALEN);
+
+	if (!*subject)
 		PG_RETURN_NULL();
-	return X509_NAME_to_text(X509_get_subject_name(MyProcPort->peer));
+
+	PG_RETURN_TEXT_P(cstring_to_text(subject));
 }
 
 
@@ -377,12 +346,21 @@ PG_FUNCTION_INFO_V1(ssl_issuer_dn);
 Datum
 ssl_issuer_dn(PG_FUNCTION_ARGS)
 {
-	if (!(MyProcPort->peer))
+	char		issuer[NAMEDATALEN];
+
+	if (!MyProcPort->ssl_in_use || !MyProcPort->peer_cert_valid)
+		PG_RETURN_NULL();
+
+	be_tls_get_peer_issuer_name(MyProcPort, issuer, NAMEDATALEN);
+
+	if (!*issuer)
 		PG_RETURN_NULL();
-	return X509_NAME_to_text(X509_get_issuer_name(MyProcPort->peer));
+
+	PG_RETURN_TEXT_P(cstring_to_text(issuer));
 }
 
 
+#ifdef USE_OPENSSL
 /*
  * Returns information about available SSL extensions.
  *
@@ -516,3 +494,13 @@ ssl_extension_info(PG_FUNCTION_ARGS)
 	/* All done */
 	SRF_RETURN_DONE(funcctx);
 }
+#endif							/* USE_OPENSSL */
+
+#ifdef USE_NSS
+PG_FUNCTION_INFO_V1(ssl_extension_info);
+Datum
+ssl_extension_info(PG_FUNCTION_ARGS)
+{
+	PG_RETURN_NULL();
+}
+#endif							/* USE_NSS */
diff --git a/doc/src/sgml/acronyms.sgml b/doc/src/sgml/acronyms.sgml
index 4e5ec983c0..4f6f0cf353 100644
--- a/doc/src/sgml/acronyms.sgml
+++ b/doc/src/sgml/acronyms.sgml
@@ -441,6 +441,28 @@
     </listitem>
    </varlistentry>
 
+   <varlistentry>
+    <term><acronym>NSPR</acronym></term>
+    <listitem>
+     <para>
+      <ulink
+      url="https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSPR">
+      Netscape Portable Runtime</ulink>
+     </para>
+    </listitem>
+   </varlistentry>
+
+   <varlistentry>
+    <term><acronym>NSS</acronym></term>
+    <listitem>
+     <para>
+      <ulink
+      url="https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS">
+      Network Security Services</ulink>
+     </para>
+    </listitem>
+   </varlistentry>
+
    <varlistentry>
     <term><acronym>ODBC</acronym></term>
     <listitem>
@@ -539,6 +561,17 @@
     </listitem>
    </varlistentry>
 
+   <varlistentry>
+    <term><acronym>PKCS#12</acronym></term>
+    <listitem>
+     <para>
+      <ulink
+      url="https://en.wikipedia.org/wiki/PKCS_12">
+      Public-Key Cryptography Standards #12</ulink>
+     </para>
+    </listitem>
+   </varlistentry>
+
    <varlistentry>
     <term><acronym>PL</acronym></term>
     <listitem>
@@ -684,6 +717,16 @@
     </listitem>
    </varlistentry>
 
+   <varlistentry>
+    <term><acronym>TLS</acronym></term>
+    <listitem>
+     <para>
+      <ulink url="https://sv.wikipedia.org/wiki/Transport_Layer_Security">
+      Transport Layer Security</ulink>
+     </para>
+    </listitem>
+   </varlistentry>
+
    <varlistentry>
     <term><acronym>TOAST</acronym></term>
     <listitem>
diff --git a/doc/src/sgml/config.sgml b/doc/src/sgml/config.sgml
index 06405f359c..a2196e3c17 100644
--- a/doc/src/sgml/config.sgml
+++ b/doc/src/sgml/config.sgml
@@ -1208,6 +1208,23 @@ include_dir 'conf.d'
       </listitem>
      </varlistentry>
 
+     <varlistentry id="guc-ssl-database" xreflabel="ssl_database">
+      <term><varname>ssl_database</varname> (<type>string</type>)
+      <indexterm>
+       <primary><varname>ssl_database</varname> configuration parameter</primary>
+      </indexterm>
+      </term>
+      <listitem>
+       <para>
+        Specifies the name of the file containing the server certificates and
+        keys when using <productname>NSS</productname> for <acronym>SSL</acronym>
+        connections. This parameter can only be set in the
+        <filename>postgresql.conf</filename> file or on the server command
+        line.
+       </para>
+      </listitem>
+     </varlistentry>
+
      <varlistentry id="guc-ssl-ciphers" xreflabel="ssl_ciphers">
       <term><varname>ssl_ciphers</varname> (<type>string</type>)
       <indexterm>
@@ -1224,7 +1241,9 @@ include_dir 'conf.d'
         connections using TLS version 1.2 and lower are affected.  There is
         currently no setting that controls the cipher choices used by TLS
         version 1.3 connections.  The default value is
-        <literal>HIGH:MEDIUM:+3DES:!aNULL</literal>.  The default is usually a
+        <literal>HIGH:MEDIUM:+3DES:!aNULL</literal> for servers which have
+        been built with <productname>OpenSSL</productname> as the
+        <acronym>SSL</acronym> library.  The default is usually a
         reasonable choice unless you have specific security requirements.
        </para>
 
@@ -1426,8 +1445,11 @@ include_dir 'conf.d'
        <para>
         Sets an external command to be invoked when a passphrase for
         decrypting an SSL file such as a private key needs to be obtained.  By
-        default, this parameter is empty, which means the built-in prompting
-        mechanism is used.
+        default, this parameter is empty. When the server is using
+        <productname>OpenSSL</productname>, this means the built-in prompting
+        mechanism is used. When using <productname>NSS</productname>, there is
+        no default prompting so a blank callback will be used returning an
+        empty password.
        </para>
        <para>
         The command must print the passphrase to the standard output and exit
diff --git a/doc/src/sgml/installation.sgml b/doc/src/sgml/installation.sgml
index b585f22408..60cd6ff8de 100644
--- a/doc/src/sgml/installation.sgml
+++ b/doc/src/sgml/installation.sgml
@@ -250,7 +250,7 @@ su - postgres
 
     <listitem>
      <para>
-      You need <productname>OpenSSL</productname>, if you want to support
+      You need a supported <acronym>SSL</acronym> library, if you want to support
       encrypted client connections.  <productname>OpenSSL</productname> is
       also required for random number generation on platforms that do not
       have <filename>/dev/urandom</filename> (except Windows).  The minimum
@@ -969,6 +969,31 @@ build-postgresql:
        </listitem>
       </varlistentry>
 
+      <varlistentry>
+       <term><option>--with-nss</option>
+       <indexterm>
+        <primary>NSS</primary>
+        <secondary>NSPR</secondary>
+        <seealso>SSL</seealso>
+       </indexterm>
+       </term>
+       <listitem>
+        <para>
+         Build with support for <acronym>SSL</acronym> (encrypted)
+         connections using <productname>NSS</productname>. This requires the
+         <productname>NSS</productname> package to be installed. Additionally,
+         <productname>NSS</productname> requires <productname>NSPR</productname>
+         to be installed. <filename>configure</filename> will check for the
+         required header files and libraries to make sure that your
+         <productname>NSS</productname> installation is sufficient before
+         proceeding.
+        </para>
+        <para>
+         This option is incompatible with <literal>--with-openssl</literal>.
+        </para>
+       </listitem>
+      </varlistentry>
+
       <varlistentry>
        <term><option>--with-openssl</option>
        <indexterm>
@@ -985,6 +1010,9 @@ build-postgresql:
          your <productname>OpenSSL</productname> installation is sufficient
          before proceeding.
         </para>
+        <para>
+         This option is incompatible with <literal>--with-nss</literal>.
+        </para>
        </listitem>
       </varlistentry>
 
diff --git a/doc/src/sgml/libpq.sgml b/doc/src/sgml/libpq.sgml
index 3315f1dd05..8b738bc412 100644
--- a/doc/src/sgml/libpq.sgml
+++ b/doc/src/sgml/libpq.sgml
@@ -2474,6 +2474,8 @@ void *PQsslStruct(const PGconn *conn, const char *struct_name);
       </para>
       <para>
        The struct(s) available depend on the SSL implementation in use.
+      </para>
+      <para>
        For <productname>OpenSSL</productname>, there is one struct,
        available under the name "OpenSSL", and it returns a pointer to the
        <productname>OpenSSL</productname> <literal>SSL</literal> struct.
@@ -2497,9 +2499,14 @@ void *PQsslStruct(const PGconn *conn, const char *struct_name);
 ]]></programlisting>
       </para>
       <para>
-       This structure can be used to verify encryption levels, check server
-       certificates, and more. Refer to the <productname>OpenSSL</productname>
-       documentation for information about this structure.
+       For <productname>NSS</productname>, there is one struct available under
+       the name "NSS", and it returns a pointer to the
+       <productname>NSS</productname> <literal>PRFileDesc</literal>.
+      </para>
+      <para>
+       These structures can be used to verify encryption levels, check server
+       certificates, and more. Refer to the <acronym>SSL</acronym> library
+       documentation for information about these structures.
       </para>
      </listitem>
     </varlistentry>
@@ -2526,6 +2533,10 @@ void *PQgetssl(const PGconn *conn);
        <xref linkend="libpq-PQsslInUse"/> instead, and for more details about the
        connection, use <xref linkend="libpq-PQsslAttribute"/>.
       </para>
+      <para>
+       This function returns <literal>NULL</literal> when <acronym>SSL</acronym>
+       librariaes other than <productname>OpenSSL</productname> are used.
+      </para>
      </listitem>
     </varlistentry>
 
@@ -7958,6 +7969,11 @@ void PQinitOpenSSL(int do_ssl, int do_crypto);
        before first opening a database connection.  Also be sure that you
        have done that initialization before opening a database connection.
       </para>
+
+      <para>
+       This function does nothing when using <productname>NSS</productname> as
+       the <acronym>SSL</acronym> library.
+      </para>
      </listitem>
     </varlistentry>
 
@@ -7984,6 +8000,11 @@ void PQinitSSL(int do_ssl);
        might be preferable for applications that need to work with older
        versions of <application>libpq</application>.
       </para>
+
+      <para>
+       This function does nothing when using <productname>NSS</productname> as
+       the <acronym>SSL</acronym> library.
+      </para>
      </listitem>
     </varlistentry>
    </variablelist>
diff --git a/doc/src/sgml/runtime.sgml b/doc/src/sgml/runtime.sgml
index f975406acd..99f27b7ed9 100644
--- a/doc/src/sgml/runtime.sgml
+++ b/doc/src/sgml/runtime.sgml
@@ -2183,15 +2183,21 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
 
   <indexterm zone="ssl-tcp">
    <primary>SSL</primary>
+   <secondary>TLS</secondary>
   </indexterm>
 
   <para>
    <productname>PostgreSQL</productname> has native support for using
    <acronym>SSL</acronym> connections to encrypt client/server communications
    for increased security. This requires that
-   <productname>OpenSSL</productname> is installed on both client and
+   a supported TLS library is installed on both client and
    server systems and that support in <productname>PostgreSQL</productname> is
    enabled at build time (see <xref linkend="installation"/>).
+   Supported libraries are <productname>OpenSSL</productname> and
+   <productname>NSS</productname>. The terms <acronym>SSL</acronym> and
+   <acronym>TLS</acronym> are often used interchangeably to mean a secure
+   connection using a <acronym>TLS</acronym> protocol, even though
+   <acronym>SSL</acronym> protocols are no longer supported.
   </para>
 
   <sect2 id="ssl-setup">
@@ -2211,8 +2217,13 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
   </para>
 
   <para>
-   To start in <acronym>SSL</acronym> mode, files containing the server certificate
-   and private key must exist.  By default, these files are expected to be
+   To start in <acronym>SSL</acronym> mode, a server certificate
+   and private key must exist. The below sections on the different libraries
+   will discuss how to configure these.
+  </para>
+   
+  <para>
+   By default, these files are expected to be
    named <filename>server.crt</filename> and <filename>server.key</filename>, respectively, in
    the server's data directory, but other names and locations can be specified
    using the configuration parameters <xref linkend="guc-ssl-cert-file"/>
@@ -2302,6 +2313,18 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
   </note>
   </sect2>
 
+  <sect2 id="ssl-nss-config">
+   <title>NSS Configuration</title>
+
+  <para>
+   <productname>PostgreSQL</productname> will look for certificates and keys
+   in the <productname>NSS</productname> database specified by the parameter
+   <xref linkend="guc-ssl-database"/> in <filename>postgresql.conf</filename>.
+   The paramaters for certificate and key filenames are used to identify the
+   nicknames in the database.
+  </para>
+  </sect2>
+
   <sect2 id="ssl-client-certificates">
    <title>Using Client Certificates</title>
 
@@ -2377,7 +2400,7 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
   </sect2>
 
   <sect2 id="ssl-server-files">
-   <title>SSL Server File Usage</title>
+   <title>SSL Server File Parameter Usage</title>
 
    <para>
     <xref linkend="ssl-file-usage"/> summarizes the files that are
@@ -2424,6 +2447,14 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
       <entry>client certificate must not be on this list</entry>
      </row>
 
+     <row>
+      <entry><xref linkend="guc-ssl-database"/></entry>
+      <entry>certificate database</entry>
+      <entry>contains server certificates, keys and revocation lists; only
+      used when <productname>PostgreSQL</productname> is built with support
+      for <productname>NSS</productname>.</entry>
+     </row>
+
     </tbody>
    </tgroup>
   </table>
@@ -2551,6 +2582,45 @@ openssl x509 -req -in server.csr -text -days 365 \
    </para>
   </sect2>
 
+  <sect2 id="nss-certificate-database">
+   <title>NSS Certificate Databases</title>
+
+   <para>
+    When using <productname>NSS</productname>, all certificates and keys must
+    be loaded into an <productname>NSS</productname> certificate database.
+   </para>
+
+   <para>
+    To create a new <productname>NSS</productname> certificate database and
+    load the certificates created in <xref linkend="ssl-certificate-creation" />,
+    use the following <productname>NSS</productname> commands:
+<programlisting>
+certutil -d "sql:server.db" -N --empty-password
+certutil -d "sql:server.db" -A -n server.crt -i server.crt -t "CT,C,C"
+certutil -d "sql:server.db" -A -n root.crt -i root.crt -t "CT,C,C"
+</programlisting>
+    This will give the certificate the filename as the nickname identifier in
+    the database which is created as <filename>server.db</filename>.
+   </para>
+   <para>
+    Then load the server key, which require converting it to
+    <acronym>PKCS#12</acronym> format using the
+    <productname>OpenSSL</productname> tools:
+<programlisting>
+openssl pkcs12 -export -out server.pfx -inkey server.key -in server.crt \
+  -certfile root.crt -passout pass:
+pk12util -i server.pfx -d server.db -W ''
+</programlisting>
+   </para>
+   <para>
+    Finally a certificate revocation list can be loaded with the following
+    commands:
+<programlisting>
+crlutil -I -i server.crl -d server.db -B
+</programlisting>
+   </para>
+  </sect2>
+
  </sect1>
 
  <sect1 id="gssapi-enc">
diff --git a/doc/src/sgml/sslinfo.sgml b/doc/src/sgml/sslinfo.sgml
index e16f61b41d..253bb697af 100644
--- a/doc/src/sgml/sslinfo.sgml
+++ b/doc/src/sgml/sslinfo.sgml
@@ -22,7 +22,8 @@
 
  <para>
   This extension won't build at all unless the installation was
-  configured with <literal>--with-openssl</literal>.
+  configured with SSL support, such as <literal>--with-openssl</literal>
+  or <literal>--with-nss</literal>.
  </para>
 
  <sect2>
@@ -54,7 +55,7 @@
     <listitem>
     <para>
      Returns the name of the protocol used for the SSL connection (e.g., TLSv1.0
-     TLSv1.1, or TLSv1.2).
+     TLSv1.1, TLSv1.2 or TLSv1.3).
     </para>
     </listitem>
    </varlistentry>
@@ -208,6 +209,9 @@ emailAddress
      the X.500 and X.509 standards, so you cannot just assign arbitrary
      meaning to them.
     </para>
+    <para>
+     This function is only available when using <productname>OpenSSL</productname>.
+    </para>
     </listitem>
    </varlistentry>
 
@@ -223,6 +227,9 @@ emailAddress
      Same as <function>ssl_client_dn_field</function>, but for the certificate issuer
      rather than the certificate subject.
     </para>
+    <para>
+     This function is only available when using <productname>OpenSSL</productname>.
+    </para>
     </listitem>
    </varlistentry>
 
@@ -238,6 +245,9 @@ emailAddress
      Provide information about extensions of client certificate: extension name,
      extension value, and if it is a critical extension.
     </para>
+    <para>
+     This function is only available when using <productname>OpenSSL</productname>.
+    </para>
     </listitem>
    </varlistentry>
   </variablelist>
diff --git a/src/Makefile.global.in b/src/Makefile.global.in
index 7ca1e9aac5..8946fa696a 100644
--- a/src/Makefile.global.in
+++ b/src/Makefile.global.in
@@ -184,6 +184,7 @@ with_perl	= @with_perl@
 with_python	= @with_python@
 with_tcl	= @with_tcl@
 with_openssl	= @with_openssl@
+with_nss        = @with_nss@
 with_readline	= @with_readline@
 with_selinux	= @with_selinux@
 with_systemd	= @with_systemd@
@@ -232,6 +233,15 @@ CLANG = @CLANG@
 BITCODE_CFLAGS = @BITCODE_CFLAGS@
 BITCODE_CXXFLAGS = @BITCODE_CXXFLAGS@
 
+ifeq ($(with_openssl),yes)
+with_ssl = yes
+else ifeq ($(with_nss),yes)
+with_ssl = yes
+else
+with_ssl = no
+endif
+
+
 ##########################################################################
 #
 # Programs and flags
diff --git a/src/backend/libpq/Makefile b/src/backend/libpq/Makefile
index efc5ef760a..191266a426 100644
--- a/src/backend/libpq/Makefile
+++ b/src/backend/libpq/Makefile
@@ -30,6 +30,10 @@ OBJS = \
 
 ifeq ($(with_openssl),yes)
 OBJS += be-secure-openssl.o
+else
+ifeq ($(with_nss),yes)
+OBJS += be-secure-nss.o
+endif
 endif
 
 ifeq ($(with_gssapi),yes)
diff --git a/src/backend/libpq/auth.c b/src/backend/libpq/auth.c
index 36565df4fc..ea6d97585e 100644
--- a/src/backend/libpq/auth.c
+++ b/src/backend/libpq/auth.c
@@ -2870,7 +2870,14 @@ CheckCertAuth(Port *port)
 {
 	int			status_check_usermap = STATUS_ERROR;
 
+#if defined(USE_OPENSSL)
 	Assert(port->ssl);
+#elif defined(USE_NSS)
+	/* TODO: should we rename pr_fd to ssl, to keep consistency? */
+	Assert(port->pr_fd);
+#else
+	Assert(false);
+#endif
 
 	/* Make sure we have received a username in the certificate */
 	if (port->peer_cn == NULL ||
diff --git a/src/backend/libpq/be-secure-nss.c b/src/backend/libpq/be-secure-nss.c
new file mode 100644
index 0000000000..b05906514a
--- /dev/null
+++ b/src/backend/libpq/be-secure-nss.c
@@ -0,0 +1,1170 @@
+/*-------------------------------------------------------------------------
+ *
+ * be-secure-nss.c
+ *	  functions for supporting NSS as a TLS backend
+ *
+ *
+ * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ *	  src/backend/libpq/be-secure-nss.c
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#include "postgres.h"
+
+#include <sys/stat.h>
+
+/*
+ * BITS_PER_BYTE is also defined in the NSPR header files, so we need to undef
+ * our version to avoid compiler warnings on redefinition.
+ */
+#define pg_BITS_PER_BYTE BITS_PER_BYTE
+#undef BITS_PER_BYTE
+
+/*
+ * The nspr/obsolete/protypes.h NSPR header typedefs uint64 and int64 with
+ * colliding definitions from ours, causing a much expected compiler error.
+ * The definitions are however not actually used in NSPR at all, and are only
+ * intended for what seems to be backwards compatibility for apps written
+ * against old versions of NSPR.  The following comment is in the referenced
+ * file, and was added in 1998:
+ *
+ *		This section typedefs the old 'native' types to the new PR<type>s.
+ *		These definitions are scheduled to be eliminated at the earliest
+ *		possible time. The NSPR API is implemented and documented using
+ *		the new definitions.
+ *
+ * As there is no opt-out from pulling in these typedefs, we define the guard
+ * for the file to exclude it. This is incredibly ugly, but seems to be about
+ * the only way around it.
+ */
+#define PROTYPES_H
+#include <nspr.h>
+#undef PROTYPES_H
+#include <nss.h>
+#include <base64.h>
+#include <cert.h>
+#include <certdb.h>
+#include <keyhi.h>
+#include <pk11pub.h>
+#include <prerror.h>
+#include <prio.h>
+#include <prmem.h>
+#include <prtypes.h>
+#include <secder.h>
+#include <secerr.h>
+#include <secitem.h>
+#include <secport.h>
+#include <ssl.h>
+#include <sslerr.h>
+#include <sslproto.h>
+
+typedef struct
+{
+	enum
+	{
+		PW_NONE = 0,
+		PW_FROMFILE = 1,
+		PW_PLAINTEXT = 2,
+		PW_EXTERNAL = 3
+	} source;
+	char	   *data;
+}			secuPWData;
+
+/*
+ * Ensure that the colliding definitions match, else throw an error. In case
+ * NSPR has removed the definition for some reason, make sure to put ours
+ * back again.
+ */
+#if defined(BITS_PER_BYTE)
+#if BITS_PER_BYTE != pg_BITS_PER_BYTE
+#error "incompatible byte widths between NSPR and postgres"
+#endif
+#else
+#define BITS_PER_BYTE pg_BITS_PER_BYTE
+#endif
+#undef pg_BITS_PER_BYTE
+
+#include "common/pg_nss.h"
+#include "lib/stringinfo.h"
+#include "libpq/libpq.h"
+#include "nodes/pg_list.h"
+#include "miscadmin.h"
+#include "storage/fd.h"
+#include "utils/guc.h"
+#include "utils/memutils.h"
+
+
+/* default init hook can be overridden by a shared library */
+static void default_nss_tls_init(bool isServerStart);
+nss_tls_init_hook_type nss_tls_init_hook = default_nss_tls_init;
+
+static PRDescIdentity pr_id;
+
+static PRIOMethods pr_iomethods;
+static NSSInitContext * nss_context = NULL;
+static SSLVersionRange desired_sslver;
+
+static char *external_ssl_passphrase_cb(PK11SlotInfo *slot, PRBool retry, void *arg);
+static bool dummy_ssl_passwd_cb_called = false;
+static bool ssl_is_server_start;
+
+/*
+ * PR_ImportTCPSocket() is a private API, but very widely used, as it's the
+ * only way to make NSS use an already set up POSIX file descriptor rather
+ * than opening one itself. To quote the NSS documentation:
+ *
+ *		"In theory, code that uses PR_ImportTCPSocket may break when NSPR's
+ *		implementation changes. In practice, this is unlikely to happen because
+ *		NSPR's implementation has been stable for years and because of NSPR's
+ *		strong commitment to backward compatibility."
+ *
+ * https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSPR/Reference/PR_ImportTCPSocket
+ *
+ * The function is declared in <private/pprio.h>, but as it is a header marked
+ * private we declare it here rather than including it.
+ */
+NSPR_API(PRFileDesc *) PR_ImportTCPSocket(int);
+
+/* NSS IO layer callback overrides */
+static PRInt32 pg_ssl_read(PRFileDesc * fd, void *buf, PRInt32 amount,
+						   PRIntn flags, PRIntervalTime timeout);
+static PRInt32 pg_ssl_write(PRFileDesc * fd, const void *buf, PRInt32 amount,
+							PRIntn flags, PRIntervalTime timeout);
+/* Utility functions */
+static PRFileDesc * init_iolayer(Port *port, int loglevel);
+static uint16 ssl_protocol_version_to_nss(int v, const char *guc_name);
+
+static char *pg_SSLerrmessage(PRErrorCode errcode);
+static char *ssl_protocol_version_to_string(int v);
+static SECStatus pg_cert_auth_handler(void *arg, PRFileDesc * fd,
+									  PRBool checksig, PRBool isServer);
+static SECStatus pg_bad_cert_handler(void *arg, PRFileDesc * fd);
+static char *dummy_ssl_passphrase_cb(PK11SlotInfo * slot, PRBool retry, void *arg);
+
+/* ------------------------------------------------------------ */
+/*						 Public interface						*/
+/* ------------------------------------------------------------ */
+
+/*
+ * be_tls_init
+ *			Initialize the nss TLS library in the postmaster
+ *
+ * The majority of the setup needs to happen in be_tls_open_server since the
+ * NSPR initialization must happen after the forking of the backend. We could
+ * potentially move some parts in under !isServerStart, but so far this is the
+ * separation chosen.
+ */
+int
+be_tls_init(bool isServerStart)
+{
+	SECStatus	status;
+	SSLVersionRange supported_sslver;
+
+	/*
+	 * Set up the connection cache for multi-processing application behavior.
+	 * If we are in ServerStart then we initialize the cache. If the server is
+	 * already started, we inherit the cache such that it can be used for
+	 * connections. Calling SSL_ConfigMPServerSIDCache sets an environment
+	 * variable which contains enough information for the forked child to know
+	 * how to access it.  Passing NULL to SSL_InheritMPServerSIDCache will
+	 * make the forked child look it up by the default name SSL_INHERITANCE,
+	 * if env vars aren't inherited then the contents of the variable can be
+	 * passed instead.
+	 */
+	if (isServerStart)
+	{
+		/*
+		 * SSLv2 and SSLv3 are disabled in this TLS backend, but when setting
+		 * up the required session cache for NSS we still must supply timeout
+		 * values for v2 and The minimum allowed value for both is 5 seconds,
+		 * so opt for that in both cases (the defaults being 100 seconds and
+		 * 24 hours).
+		 *
+		 * Passing NULL as the directory for the session cache will default to
+		 * using /tmp on UNIX and \\temp on Windows.  Deciding if we want to
+		 * keep closer control on this directory is left as a TODO.
+		 */
+		status = SSL_ConfigMPServerSIDCache(MaxConnections, 5, 5, NULL);
+		if (status != SECSuccess)
+			ereport(FATAL,
+					(errmsg("unable to set up TLS connection cache: %s",
+							pg_SSLerrmessage(PR_GetError()))));
+
+	}
+	else
+	{
+		status = SSL_InheritMPServerSIDCache(NULL);
+		if (status != SECSuccess)
+		{
+			ereport(LOG,
+					(errmsg("unable to connect to TLS connection cache: %s",
+							pg_SSLerrmessage(PR_GetError()))));
+			return -1;
+		}
+	}
+
+	if (!ssl_database || strlen(ssl_database) == 0)
+	{
+		ereport(isServerStart ? FATAL : LOG,
+				(errmsg("no certificate database specified")));
+		goto error;
+	}
+
+	/*
+	 * We check for the desired TLS version range here, even though we cannot
+	 * set it until be_open_server such that we can be compatible with how the
+	 * OpenSSL backend reports errors for incompatible range configurations.
+	 * Set either the default supported TLS version range, or the configured
+	 * range from ssl_min_protocol_version and ssl_max_protocol version. In
+	 * case the user hasn't defined the maximum allowed version we fall back
+	 * to the highest version TLS that the library supports.
+	 */
+	if (SSL_VersionRangeGetSupported(ssl_variant_stream, &supported_sslver) != SECSuccess)
+	{
+		ereport(isServerStart ? FATAL : LOG,
+				(errmsg("unable to get default protocol support from NSS")));
+		goto error;
+	}
+
+	/*
+	 * Set the fallback versions for the TLS protocol version range to a
+	 * combination of our minimal requirement and the library maximum.
+	 */
+	desired_sslver.min = SSL_LIBRARY_VERSION_TLS_1_0;
+	desired_sslver.max = supported_sslver.max;
+
+	if (ssl_min_protocol_version)
+	{
+		int			ver = ssl_protocol_version_to_nss(ssl_min_protocol_version,
+													  "ssl_min_protocol_version");
+
+		if (ver == -1)
+		{
+			ereport(isServerStart ? FATAL : LOG,
+					(errmsg("\"%s\" setting \"%s\" not supported by this build",
+							"ssl_min_protocol_version",
+							GetConfigOption("ssl_min_protocol_version",
+											false, false))));
+			goto error;
+		}
+
+		if (ver > 0)
+			desired_sslver.min = ver;
+	}
+
+	if (ssl_max_protocol_version)
+	{
+		int			ver = ssl_protocol_version_to_nss(ssl_max_protocol_version,
+													  "ssl_max_protocol_version");
+
+		if (ver == -1)
+		{
+			ereport(isServerStart ? FATAL : LOG,
+					(errmsg("\"%s\" setting \"%s\" not supported by this build",
+							"ssl_max_protocol_version",
+							GetConfigOption("ssl_max_protocol_version",
+											false, false))));
+			goto error;
+		}
+		if (ver > 0)
+			desired_sslver.max = ver;
+
+		if (ver < desired_sslver.min)
+		{
+			ereport(isServerStart ? FATAL : LOG,
+					(errmsg("could not set SSL protocol version range"),
+					 errdetail("\"%s\" cannot be higher than \"%s\"",
+							   "ssl_min_protocol_version",
+							   "ssl_max_protocol_version")));
+			goto error;
+		}
+	}
+
+	/*
+	 * Set the passphrase callback which will be used both to obtain the
+	 * passphrase from the user, as well as by NSS to obtain the phrase
+	 * repeatedly.
+	 */
+	ssl_is_server_start = isServerStart;
+	(*nss_tls_init_hook) (isServerStart);
+
+	return 0;
+error:
+	return -1;
+}
+
+int
+be_tls_open_server(Port *port)
+{
+	SECStatus	status;
+	PRFileDesc *model;
+	PRFileDesc *pr_fd;
+	PRFileDesc *layer;
+	CERTCertificate *server_cert;
+	SECKEYPrivateKey *private_key;
+	CERTSignedCrl *crl;
+	SECItem		crlname;
+	char	   *cert_database;
+	NSSInitParameters params;
+
+	/*
+	 * The NSPR documentation states that runtime initialization via PR_Init
+	 * is no longer required, as the first caller into NSPR will perform the
+	 * initialization implicitly. The documentation doesn't however clarify
+	 * from which version this is holds true, so let's perform the potentially
+	 * superfluous initialization anyways to avoid crashing on older versions
+	 * of NSPR, as there is no difference in overhead.  The NSS documentation
+	 * still states that PR_Init must be called in some way (implicitly or
+	 * explicitly).
+	 *
+	 * The below parameters are what the implicit initialization would've done
+	 * for us, and should work even for older versions where it might not be
+	 * done automatically. The last parameter, maxPTDs, is set to various
+	 * values in other codebases, but has been unused since NSPR 2.1 which was
+	 * released sometime in 1998.
+	 */
+	PR_Init(PR_USER_THREAD, PR_PRIORITY_NORMAL, 0 /* maxPTDs */ );
+
+	/*
+	 * The certificate path (configdir) must contain a valid NSS database. If
+	 * the certificate path isn't a valid directory, NSS will fall back on the
+	 * system certificate database. If the certificate path is a directory but
+	 * is empty then the initialization will fail. On the client side this can
+	 * be allowed for any sslmode but the verify-xxx ones.
+	 * https://bugzilla.redhat.com/show_bug.cgi?id=728562 For the server side
+	 * we wont allow this to fail however, as we require the certificate and
+	 * key to exist.
+	 *
+	 * The original design of NSS was for a single application to use a single
+	 * copy of it, initialized with NSS_Initialize() which isn't returning any
+	 * handle with which to refer to NSS. NSS initialization and shutdown are
+	 * global for the application, so a shutdown in another NSS enabled
+	 * library would cause NSS to be stopped for libpq as well.  The fix has
+	 * been to introduce NSS_InitContext which returns a context handle to
+	 * pass to NSS_ShutdownContext.  NSS_InitContext was introduced in NSS
+	 * 3.12, but the use of it is not very well documented.
+	 * https://bugzilla.redhat.com/show_bug.cgi?id=738456
+	 *
+	 * The InitParameters struct passed can be used to override internal
+	 * values in NSS, but the usage is not documented at all. When using
+	 * NSS_Init initializations, the values are instead set via PK11_Configure
+	 * calls so the PK11_Configure documentation can be used to glean some
+	 * details on these.
+	 *
+	 * https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS/PKCS11/Module_Specs
+	 */
+	memset(&params, '\0', sizeof(params));
+	params.length = sizeof(params);
+
+	if (!ssl_database || strlen(ssl_database) == 0)
+		ereport(FATAL,
+				(errmsg("no certificate database specified")));
+
+	cert_database = psprintf("sql:%s", ssl_database);
+	nss_context = NSS_InitContext(cert_database, "", "", "",
+								  &params,
+								  NSS_INIT_READONLY | NSS_INIT_PK11RELOAD);
+	pfree(cert_database);
+
+	if (!nss_context)
+		ereport(FATAL,
+				(errmsg("unable to read certificate database \"%s\": %s",
+						ssl_database, pg_SSLerrmessage(PR_GetError()))));
+
+	/*
+	 * Import the already opened socket as we don't want to use NSPR functions
+	 * for opening the network socket due to how the PostgreSQL protocol works
+	 * with TLS connections. This function is not part of the NSPR public API,
+	 * see the comment at the top of the file for the rationale of still using
+	 * it.
+	 */
+	pr_fd = PR_ImportTCPSocket(port->sock);
+	if (!pr_fd)
+		ereport(ERROR,
+				(errmsg("unable to connect to socket")));
+
+	/*
+	 * Most of the documentation available, and implementations of, NSS/NSPR
+	 * use the PR_NewTCPSocket() function here, which has the drawback that it
+	 * can only create IPv4 sockets. Instead use PR_OpenTCPSocket() which
+	 * copes with IPv6 as well.
+	 */
+	model = PR_OpenTCPSocket(port->laddr.addr.ss_family);
+	if (!model)
+		ereport(ERROR,
+				(errmsg("unable to open socket")));
+
+	/*
+	 * Convert the NSPR socket to an SSL socket. Ensuring the success of this
+	 * operation is critical as NSS SSL_* functions may return SECSuccess on
+	 * the socket even though SSL hasn't been enabled, which introduce a risk
+	 * of silent downgrades.
+	 */
+	model = SSL_ImportFD(NULL, model);
+	if (!model)
+		ereport(ERROR,
+				(errmsg("unable to enable TLS on socket")));
+
+	/*
+	 * Configure basic settings for the connection over the SSL socket in
+	 * order to set it up as a server.
+	 */
+	if (SSL_OptionSet(model, SSL_SECURITY, PR_TRUE) != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to configure TLS connection")));
+
+	if (SSL_OptionSet(model, SSL_HANDSHAKE_AS_SERVER, PR_TRUE) != SECSuccess ||
+		SSL_OptionSet(model, SSL_HANDSHAKE_AS_CLIENT, PR_FALSE) != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to configure TLS connection as server")));
+
+	/*
+	 * SSLv2 is disabled by default, and SSLv3 will be excluded from the range
+	 * of allowed protocols further down. Since we really don't want these to
+	 * ever be enabled, let's use belts and suspenders and explicitly turn
+	 * them off as well.
+	 */
+	SSL_OptionSet(model, SSL_ENABLE_SSL2, PR_FALSE);
+	SSL_OptionSet(model, SSL_ENABLE_SSL3, PR_FALSE);
+
+#ifdef SSL_CBC_RANDOM_IV
+
+	/*
+	 * Enable protection against the BEAST attack in case the NSS server has
+	 * support for that. While SSLv3 is disabled, we may still allow TLSv1
+	 * which is affected. The option isn't documented as an SSL option, but as
+	 * an NSS environment variable.
+	 */
+	SSL_OptionSet(model, SSL_CBC_RANDOM_IV, PR_TRUE);
+#endif
+
+	/*
+	 * Configure the allowed cipher. If there are no user preferred suites,
+	 * set the domestic policy. TODO: while this code works, the set of
+	 * ciphers which can be set and still end up with a working socket is
+	 * woefully underdocumented for anything more recent than SSLv3 (the code
+	 * for TLS actually calls ssl3 functions under the hood for
+	 * SSL_CipherPrefSet), so it's unclear if this is helpful or not. Using
+	 * the policies works, but may be too coarsely grained.
+	 *
+	 * Another TODO: The SSL_ImplementedCiphers table returned with calling
+	 * SSL_GetImplementedCiphers is sorted in server preference order. Sorting
+	 * SSLCipherSuites according to the order of the ciphers therein could be
+	 * a way to implement ssl_prefer_server_ciphers - if we at all want to use
+	 * cipher selection for NSS like how we do it for OpenSSL that is.
+	 */
+
+	/*
+	 * If no ciphers are specified, we use the domestic policy
+	 */
+	if (!SSLCipherSuites || strlen(SSLCipherSuites) == 0)
+	{
+		status = NSS_SetDomesticPolicy();
+		if (status != SECSuccess)
+			ereport(ERROR,
+					(errmsg("unable to set cipher policy: %s",
+							pg_SSLerrmessage(PR_GetError()))));
+	}
+	else
+	{
+		char	   *ciphers,
+				   *c;
+
+		char	   *sep = ":;, ";
+		PRUint16	ciphercode;
+		const		PRUint16 *nss_ciphers;
+
+		/*
+		 * If the user has specified a set of preferred cipher suites we start
+		 * by turning off all the existing suites to avoid the risk of down-
+		 * grades to a weaker cipher than expected.
+		 */
+		nss_ciphers = SSL_GetImplementedCiphers();
+		for (int i = 0; i < SSL_GetNumImplementedCiphers(); i++)
+			SSL_CipherPrefSet(model, nss_ciphers[i], PR_FALSE);
+
+		ciphers = pstrdup(SSLCipherSuites);
+
+		for (c = strtok(ciphers, sep); c; c = strtok(NULL, sep))
+		{
+			ciphercode = pg_find_cipher(c);
+			if (ciphercode != INVALID_CIPHER)
+			{
+				status = SSL_CipherPrefSet(model, ciphercode, PR_TRUE);
+				if (status != SECSuccess)
+					ereport(ERROR,
+							(errmsg("invalid cipher-suite specified: %s", c)));
+			}
+		}
+
+		pfree(ciphers);
+	}
+
+	if (SSL_VersionRangeSet(model, &desired_sslver) != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to set requested SSL protocol version range")));
+
+	/*
+	 * Set up the custom IO layer.
+	 */
+	layer = init_iolayer(port, ERROR);
+	if (!layer)
+		goto error;
+
+	/* Store the Port as private data available in callbacks */
+	layer->secret = (void *) port;
+
+	if (PR_PushIOLayer(pr_fd, PR_TOP_IO_LAYER, layer) != PR_SUCCESS)
+	{
+		PR_Close(layer);
+		ereport(ERROR,
+				(errmsg("unable to push IO layer")));
+	}
+
+	server_cert = PK11_FindCertFromNickname(ssl_cert_file, (void *) port);
+	if (!server_cert)
+	{
+		if (dummy_ssl_passwd_cb_called)
+			ereport(ERROR,
+					(errmsg("unable to load certificate for \"%s\": %s",
+							ssl_cert_file, pg_SSLerrmessage(PR_GetError())),
+					 errhint("The certificate requires a password.")));
+		else
+			ereport(ERROR,
+					(errmsg("unable to find certificate for \"%s\": %s",
+							ssl_cert_file, pg_SSLerrmessage(PR_GetError()))));
+	}
+
+	private_key = PK11_FindKeyByAnyCert(server_cert, (void *) port);
+	if (!private_key)
+	{
+		if (dummy_ssl_passwd_cb_called)
+			ereport(ERROR,
+					(errmsg("unable to load private key for \"%s\": %s",
+							ssl_cert_file, pg_SSLerrmessage(PR_GetError())),
+					 errhint("The private key requires a password.")));
+		else
+			ereport(ERROR,
+					(errmsg("unable to find private key for \"%s\": %s",
+							ssl_cert_file, pg_SSLerrmessage(PR_GetError()))));
+	}
+
+	/*
+	 * NSS doesn't use CRL files on disk, so we use the ssl_crl_file guc to
+	 * contain the CRL nickname for the current server certificate in the NSS
+	 * certificate database. The main difference from the OpenSSL backend is
+	 * that NSS will use the CRL regardless, but being able to make sure the
+	 * CRL is loaded seems like a good feature.
+	 */
+	if (ssl_crl_file[0])
+	{
+		SECITEM_CopyItem(NULL, &crlname, &server_cert->derSubject);
+		crl = SEC_FindCrlByName(CERT_GetDefaultCertDB(), &crlname, SEC_CRL_TYPE);
+		if (!crl)
+			ereport(ERROR,
+					(errmsg("specified CRL not found in database")));
+		SEC_DestroyCrl(crl);
+	}
+
+	/*
+	 * Finally we must configure the socket for being a server by setting the
+	 * certificate and key.
+	 */
+	status = SSL_ConfigSecureServer(model, server_cert, private_key, kt_rsa);
+	if (status != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to configure secure server: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+	status = SSL_ConfigServerCert(model, server_cert, private_key, NULL, 0);
+	if (status != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to configure server for TLS server connections: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+
+	ssl_loaded_verify_locations = true;
+
+	/*
+	 * At this point, we no longer have use for the certificate and private
+	 * key as they have been copied into the context by NSS. Destroy our
+	 * copies explicitly to clean out the memory as best we can.
+	 */
+	CERT_DestroyCertificate(server_cert);
+	SECKEY_DestroyPrivateKey(private_key);
+
+	status = SSL_AuthCertificateHook(model, pg_cert_auth_handler, (void *) port);
+	if (status != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to install authcert hook: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+	SSL_BadCertHook(model, pg_bad_cert_handler, (void *) port);
+	SSL_OptionSet(model, SSL_REQUEST_CERTIFICATE, PR_TRUE);
+	SSL_OptionSet(model, SSL_REQUIRE_CERTIFICATE, PR_FALSE);
+
+	port->pr_fd = SSL_ImportFD(model, pr_fd);
+	if (!port->pr_fd)
+		ereport(ERROR,
+				(errmsg("unable to initialize")));
+
+	PR_Close(model);
+
+	/*
+	 * Force a handshake on the next I/O request, the second parameter means
+	 * that we are a server, PR_FALSE would indicate being a client. NSPR
+	 * requires us to call SSL_ResetHandshake since we imported an already
+	 * established socket.
+	 */
+	status = SSL_ResetHandshake(port->pr_fd, PR_TRUE);
+	if (status != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to initiate handshake: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+	status = SSL_ForceHandshake(port->pr_fd);
+	if (status != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to handshake: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+
+	port->ssl_in_use = true;
+	return 0;
+
+error:
+	return 1;
+}
+
+ssize_t
+be_tls_read(Port *port, void *ptr, size_t len, int *waitfor)
+{
+	ssize_t		n_read;
+	PRErrorCode err;
+
+	n_read = PR_Read(port->pr_fd, ptr, len);
+
+	if (n_read < 0)
+	{
+		err = PR_GetError();
+
+		/* XXX: This logic seems potentially bogus? */
+		if (err == PR_WOULD_BLOCK_ERROR)
+			*waitfor = WL_SOCKET_READABLE;
+		else
+			*waitfor = WL_SOCKET_WRITEABLE;
+	}
+
+	return n_read;
+}
+
+ssize_t
+be_tls_write(Port *port, void *ptr, size_t len, int *waitfor)
+{
+	ssize_t		n_write;
+	PRErrorCode err;
+
+	n_write = PR_Send(port->pr_fd, ptr, len, 0, PR_INTERVAL_NO_WAIT);
+
+	if (n_write < 0)
+	{
+		err = PR_GetError();
+
+		if (err == PR_WOULD_BLOCK_ERROR)
+			*waitfor = WL_SOCKET_WRITEABLE;
+		else
+			*waitfor = WL_SOCKET_READABLE;
+	}
+
+	return n_write;
+}
+
+void
+be_tls_close(Port *port)
+{
+	if (!port)
+		return;
+
+	if (port->peer_cn)
+	{
+		SSL_InvalidateSession(port->pr_fd);
+		pfree(port->peer_cn);
+		port->peer_cn = NULL;
+	}
+
+	PR_Close(port->pr_fd);
+	port->pr_fd = NULL;
+	port->ssl_in_use = false;
+
+	if (nss_context)
+	{
+		NSS_ShutdownContext(nss_context);
+		nss_context = NULL;
+	}
+}
+
+void
+be_tls_destroy(void)
+{
+	/*
+	 * It reads a bit odd to clear a session cache when we are destroying the
+	 * context altogether, but if the session cache isn't cleared before
+	 * shutting down the context it will fail with SEC_ERROR_BUSY.
+	 */
+	SSL_ClearSessionCache();
+}
+
+int
+be_tls_get_cipher_bits(Port *port)
+{
+	SECStatus	status;
+	SSLChannelInfo channel;
+	SSLCipherSuiteInfo suite;
+
+	status = SSL_GetChannelInfo(port->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+		goto error;
+
+	status = SSL_GetCipherSuiteInfo(channel.cipherSuite, &suite, sizeof(suite));
+	if (status != SECSuccess)
+		goto error;
+
+	return suite.effectiveKeyBits;
+
+error:
+	ereport(WARNING,
+			(errmsg("unable to extract TLS session information: %s",
+					pg_SSLerrmessage(PR_GetError()))));
+	return 0;
+}
+
+/*
+ * be_tls_get_compression
+ *
+ * NSS disabled support for TLS compression in version 3.33 and removed the
+ * code in a subsequent release. The API for retrieving information about
+ * compression as well as enabling it is kept for backwards compatibility, but
+ * we don't need to consult it since it was only available for SSLv3 which we
+ * don't support.
+ *
+ * https://bugzilla.mozilla.org/show_bug.cgi?id=1409587
+ */
+bool
+be_tls_get_compression(Port *port)
+{
+	return false;
+}
+
+/*
+ * be_tls_get_version
+ *
+ * Returns the protocol version used for the current connection, or NULL in
+ * case of errors.
+ */
+const char *
+be_tls_get_version(Port *port)
+{
+	SECStatus	status;
+	SSLChannelInfo channel;
+
+	status = SSL_GetChannelInfo(port->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+	{
+		ereport(WARNING,
+				(errmsg("unable to extract TLS session information: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+		return NULL;
+	}
+
+	return ssl_protocol_version_to_string(channel.protocolVersion);
+}
+
+const char *
+be_tls_get_cipher(Port *port)
+{
+	SECStatus	status;
+	SSLChannelInfo channel;
+	SSLCipherSuiteInfo suite;
+
+	status = SSL_GetChannelInfo(port->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+		goto error;
+
+	status = SSL_GetCipherSuiteInfo(channel.cipherSuite, &suite, sizeof(suite));
+	if (status != SECSuccess)
+		goto error;
+
+	return suite.cipherSuiteName;
+
+error:
+	ereport(WARNING,
+			(errmsg("unable to extract TLS session information: %s",
+					pg_SSLerrmessage(PR_GetError()))));
+	return NULL;
+}
+
+void
+be_tls_get_peer_subject_name(Port *port, char *ptr, size_t len)
+{
+	CERTCertificate *certificate;
+
+	certificate = SSL_PeerCertificate(port->pr_fd);
+	if (certificate)
+		strlcpy(ptr, CERT_NameToAscii(&certificate->subject), len);
+	else
+		ptr[0] = '\0';
+}
+
+void
+be_tls_get_peer_issuer_name(Port *port, char *ptr, size_t len)
+{
+	CERTCertificate *certificate;
+
+	certificate = SSL_PeerCertificate(port->pr_fd);
+	if (certificate)
+		strlcpy(ptr, CERT_NameToAscii(&certificate->issuer), len);
+	else
+		ptr[0] = '\0';
+}
+
+void
+be_tls_get_peer_serial(Port *port, char *ptr, size_t len)
+{
+	CERTCertificate *certificate;
+
+	certificate = SSL_PeerCertificate(port->pr_fd);
+	if (certificate)
+		snprintf(ptr, len, "%li", DER_GetInteger(&(certificate->serialNumber)));
+	else
+		ptr[0] = '\0';
+}
+
+/* ------------------------------------------------------------ */
+/*						Internal functions						*/
+/* ------------------------------------------------------------ */
+
+/*
+ * default_nss_tls_init
+ *
+ * The default TLS init hook function which users can override for installing
+ * their own passphrase callbacks and similar actions. In case no callback has
+ * been configured, or the callback isn't reload capable during a server
+ * reload, the dummy callback will be installed.
+ *
+ * The private data for the callback is set differently depending on how it's
+ * invoked. For calls which may invoke the callback deeper in the callstack
+ * the private data is set with SSL_SetPKCS11PinArg. When the call is directly
+ * invoking the callback, like PK11_FindCertFromNickname, then the private
+ * data is passed as a parameter. Setting the data with SSL_SetPKCS11PinArg is
+ * thus not required but good practice.
+ *
+ * NSS doesn't provide a default callback like OpenSSL does, but a callback is
+ * required to be set.  The password callback can be installed at any time, but
+ * setting the private data with SSL_SetPKCS11PinArg requires a PR Filedesc.
+ */
+static void
+default_nss_tls_init(bool isServerStart)
+{
+	/*
+	 * No user-defined callback has been configured, install the dummy call-
+	 * back since we must set something.
+	 */
+	if (!ssl_passphrase_command[0])
+		PK11_SetPasswordFunc(dummy_ssl_passphrase_cb);
+	else
+	{
+		/*
+		 * There is a user-defined callback, set it unless we are in a restart
+		 * and cannot handle restarts due to an interactive callback.
+		 */
+		if (isServerStart)
+			PK11_SetPasswordFunc(external_ssl_passphrase_cb);
+		else
+		{
+			if (ssl_passphrase_command_supports_reload)
+				PK11_SetPasswordFunc(external_ssl_passphrase_cb);
+			else
+				PK11_SetPasswordFunc(dummy_ssl_passphrase_cb);
+		}
+	}
+}
+
+/*
+ * external_ssl_passphrase_cb
+ *
+ * Runs the callback configured by ssl_passphrase_command and returns the
+ * captured password back to NSS.
+ */
+static char *
+external_ssl_passphrase_cb(PK11SlotInfo *slot, PRBool retry, void *arg)
+{
+	/*
+	 * NSS use a hardcoded 256 byte buffer for reading the password so set the
+	 * same limit for our callback buffer.
+	 */
+	char		buf[256];
+	int			len;
+	char	   *password = NULL;
+	char	   *prompt;
+
+	/*
+	 * Since there is no password callback in NSS when the server starts up,
+	 * it makes little sense to create an interactive callback. Thus, if this
+	 * is a retry attempt then give up immediately.
+	 */
+	if (retry)
+		return NULL;
+
+	/*
+	 * Construct the same prompt that NSS uses internally even though it is
+	 * unlikely to serve much purpose, but we must set a prompt so we might
+	 * as well do it right.
+	 */
+	prompt = psprintf("Enter Password or Pin for \"%s\":",
+					  PK11_GetTokenName(slot));
+
+	len = run_ssl_passphrase_command(prompt, ssl_is_server_start, buf, sizeof(buf));
+	pfree(prompt);
+
+	if (!len)
+		return NULL;
+
+	/*
+	 * At least one byte with password content was returned, and NSS requires
+	 * that we return it allocated in NSS controlled memory. If we fail to
+	 * allocate then abort without passing back NULL and bubble up the error
+	 * on the PG side.
+	 */
+	password = (char *) PR_Malloc(len + 1);
+	if (!password)
+		ereport(ERROR,
+				(errcode(ERRCODE_OUT_OF_MEMORY),
+				 errmsg("out of memory")));
+	strlcpy(password, buf, sizeof(password));
+	explicit_bzero(buf, sizeof(buf));
+
+	return password;
+}
+
+/*
+ * dummy_ssl_passphrase_cb
+ *
+ * Return unsuccessful if we are asked to provide the passphrase for a cert or
+ * key, without having a passphrase callback installed.
+ */
+static char *
+dummy_ssl_passphrase_cb(PK11SlotInfo *slot, PRBool retry, void *arg)
+{
+	dummy_ssl_passwd_cb_called = true;
+	return NULL;
+}
+
+static SECStatus
+pg_bad_cert_handler(void *arg, PRFileDesc * fd)
+{
+	Port	   *port = (Port *) arg;
+
+	port->peer_cert_valid = false;
+	return SECFailure;
+}
+
+static SECStatus
+pg_cert_auth_handler(void *arg, PRFileDesc * fd, PRBool checksig, PRBool isServer)
+{
+	SECStatus	status;
+	Port	   *port = (Port *) arg;
+	CERTCertificate *cert;
+	char	   *peer_cn;
+	int			len;
+
+	status = SSL_AuthCertificate(CERT_GetDefaultCertDB(), port->pr_fd, checksig, PR_TRUE);
+	if (status == SECSuccess)
+	{
+		cert = SSL_PeerCertificate(port->pr_fd);
+		len = strlen(cert->subjectName);
+		peer_cn = MemoryContextAllocZero(TopMemoryContext, len + 1);
+		if (strncmp(cert->subjectName, "CN=", 3) == 0)
+			strlcpy(peer_cn, cert->subjectName + strlen("CN="), len + 1);
+		else
+			strlcpy(peer_cn, cert->subjectName, len + 1);
+		CERT_DestroyCertificate(cert);
+
+		port->peer_cn = peer_cn;
+		port->peer_cert_valid = true;
+	}
+
+	return status;
+}
+
+static PRInt32
+pg_ssl_read(PRFileDesc * fd, void *buf, PRInt32 amount, PRIntn flags,
+			PRIntervalTime timeout)
+{
+	PRRecvFN	read_fn;
+	PRInt32		n_read;
+
+	read_fn = fd->lower->methods->recv;
+	n_read = read_fn(fd->lower, buf, amount, flags, timeout);
+
+	return n_read;
+}
+
+static PRInt32
+pg_ssl_write(PRFileDesc * fd, const void *buf, PRInt32 amount, PRIntn flags,
+			 PRIntervalTime timeout)
+{
+	PRSendFN	send_fn;
+	PRInt32		n_write;
+
+	send_fn = fd->lower->methods->send;
+	n_write = send_fn(fd->lower, buf, amount, flags, timeout);
+
+	return n_write;
+}
+
+static PRFileDesc *
+init_iolayer(Port *port, int loglevel)
+{
+	const		PRIOMethods *default_methods;
+	PRFileDesc *layer;
+
+	/*
+	 * Start by initializing our layer with all the default methods so that we
+	 * can selectively override the ones we want while still ensuring that we
+	 * have a complete layer specification.
+	 */
+	default_methods = PR_GetDefaultIOMethods();
+	memcpy(&pr_iomethods, default_methods, sizeof(PRIOMethods));
+
+	pr_iomethods.recv = pg_ssl_read;
+	pr_iomethods.send = pg_ssl_write;
+
+	/*
+	 * Each IO layer must be identified by a unique name, where uniqueness is
+	 * per connection. Each connection in a postgres cluster can generate the
+	 * identity from the same string as they will create their IO layers on
+	 * different sockets. Only one layer per socket can have the same name.
+	 */
+	pr_id = PR_GetUniqueIdentity("PostgreSQL");
+	if (pr_id == PR_INVALID_IO_LAYER)
+	{
+		ereport(loglevel,
+				(errmsg("out of memory when setting up TLS connection")));
+		return NULL;
+	}
+
+	/*
+	 * Create the actual IO layer as a stub such that it can be pushed onto
+	 * the layer stack. The step via a stub is required as we define custom
+	 * callbacks.
+	 */
+	layer = PR_CreateIOLayerStub(pr_id, &pr_iomethods);
+	if (!layer)
+	{
+		ereport(loglevel,
+				(errmsg("unable to create NSS I/O layer")));
+		return NULL;
+	}
+
+	return layer;
+}
+
+static char *
+ssl_protocol_version_to_string(int v)
+{
+	switch (v)
+	{
+			/* SSL v2 and v3 are not supported */
+		case SSL_LIBRARY_VERSION_2:
+		case SSL_LIBRARY_VERSION_3_0:
+			Assert(false);
+			break;
+
+		case SSL_LIBRARY_VERSION_TLS_1_0:
+			return pstrdup("TLSv1.0");
+		case SSL_LIBRARY_VERSION_TLS_1_1:
+			return pstrdup("TLSv1.1");
+		case SSL_LIBRARY_VERSION_TLS_1_2:
+			return pstrdup("TLSv1.2");
+		case SSL_LIBRARY_VERSION_TLS_1_3:
+			return pstrdup("TLSv1.3");
+	}
+
+	return pstrdup("unknown");
+}
+
+
+/*
+ * ssl_protocol_version_to_nss
+ *			Translate PostgreSQL TLS version to NSS version
+ *
+ * Returns zero in case the requested TLS version is undefined (PG_ANY) and
+ * should be set by the caller, or -1 on failure.
+ */
+static uint16
+ssl_protocol_version_to_nss(int v, const char *guc_name)
+{
+	switch (v)
+	{
+			/*
+			 * There is no SSL_LIBRARY_ macro defined in NSS with the value
+			 * zero, so we use this to signal the caller that the highest
+			 * useful version should be set on the connection.
+			 */
+		case PG_TLS_ANY:
+			return 0;
+
+			/*
+			 * No guard is required here as there are no versions of NSS
+			 * without support for TLS1.
+			 */
+		case PG_TLS1_VERSION:
+			return SSL_LIBRARY_VERSION_TLS_1_0;
+		case PG_TLS1_1_VERSION:
+#ifdef SSL_LIBRARY_VERSION_TLS_1_1
+			return SSL_LIBRARY_VERSION_TLS_1_1;
+#else
+			break;
+#endif
+		case PG_TLS1_2_VERSION:
+#ifdef SSL_LIBRARY_VERSION_TLS_1_2
+			return SSL_LIBRARY_VERSION_TLS_1_2;
+#else
+			break;
+#endif
+		case PG_TLS1_3_VERSION:
+#ifdef SSL_LIBRARY_VERSION_TLS_1_3
+			return SSL_LIBRARY_VERSION_TLS_1_3;
+#else
+			break;
+#endif
+		default:
+			break;
+	}
+
+	return -1;
+}
+
+/*
+ * pg_SSLerrmessage
+ *		Create and return a human readable error message given
+ *		the specified error code
+ *
+ * PR_ErrorToName only converts the enum identifier of the error to string,
+ * but that can be quite useful for debugging (and in case PR_ErrorToString is
+ * unable to render a message then we at least have something).
+ */
+static char *
+pg_SSLerrmessage(PRErrorCode errcode)
+{
+	char		error[128];
+	int			ret;
+
+	/* TODO: this should perhaps use a StringInfo instead.. */
+	ret = pg_snprintf(error, sizeof(error), "%s (%s)",
+					  PR_ErrorToString(errcode, PR_LANGUAGE_I_DEFAULT),
+					  PR_ErrorToName(errcode));
+	if (ret)
+		return pstrdup(error);
+
+	return pstrdup(_("unknown TLS error"));
+}
diff --git a/src/backend/libpq/be-secure-openssl.c b/src/backend/libpq/be-secure-openssl.c
index 8b21ff4065..5962cffc0c 100644
--- a/src/backend/libpq/be-secure-openssl.c
+++ b/src/backend/libpq/be-secure-openssl.c
@@ -1298,15 +1298,28 @@ X509_NAME_to_cstring(X509_NAME *name)
 	char	   *dp;
 	char	   *result;
 
+	if (membuf == NULL)
+		ereport(ERROR,
+				(errcode(ERRCODE_OUT_OF_MEMORY),
+				 errmsg("failed to create BIO")));
+
 	(void) BIO_set_close(membuf, BIO_CLOSE);
 	for (i = 0; i < count; i++)
 	{
 		e = X509_NAME_get_entry(name, i);
 		nid = OBJ_obj2nid(X509_NAME_ENTRY_get_object(e));
+		if (nid == NID_undef)
+			ereport(ERROR,
+					(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
+					 errmsg("could not get NID for ASN1_OBJECT object")));
 		v = X509_NAME_ENTRY_get_data(e);
 		field_name = OBJ_nid2sn(nid);
 		if (!field_name)
 			field_name = OBJ_nid2ln(nid);
+		if (field_name == NULL)
+			ereport(ERROR,
+					(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
+					 errmsg("could not convert NID %d to an ASN1_OBJECT structure", nid)));
 		BIO_printf(membuf, "/%s=", field_name);
 		ASN1_STRING_print_ex(membuf, v,
 							 ((ASN1_STRFLGS_RFC2253 & ~ASN1_STRFLGS_ESC_MSB)
@@ -1322,7 +1335,8 @@ X509_NAME_to_cstring(X509_NAME *name)
 	result = pstrdup(dp);
 	if (dp != sp)
 		pfree(dp);
-	BIO_free(membuf);
+	if (BIO_free(membuf) != 1)
+		elog(ERROR, "could not free OpenSSL BIO structure");
 
 	return result;
 }
diff --git a/src/backend/libpq/be-secure.c b/src/backend/libpq/be-secure.c
index 2ae507a902..f39977b80c 100644
--- a/src/backend/libpq/be-secure.c
+++ b/src/backend/libpq/be-secure.c
@@ -49,6 +49,9 @@ bool		ssl_passphrase_command_supports_reload;
 #ifdef USE_SSL
 bool		ssl_loaded_verify_locations = false;
 #endif
+#ifdef USE_NSS
+char	   *ssl_database;
+#endif
 
 /* GUC variable controlling SSL cipher list */
 char	   *SSLCipherSuites = NULL;
diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c
index 596bcb7b84..ce6200c851 100644
--- a/src/backend/utils/misc/guc.c
+++ b/src/backend/utils/misc/guc.c
@@ -4262,7 +4262,11 @@ static struct config_string ConfigureNamesString[] =
 		},
 		&ssl_library,
 #ifdef USE_SSL
+#if defined(USE_OPENSSL)
 		"OpenSSL",
+#elif defined(USE_NSS)
+		"NSS",
+#endif
 #else
 		"",
 #endif
@@ -4320,6 +4324,18 @@ static struct config_string ConfigureNamesString[] =
 		check_canonical_path, assign_pgstat_temp_directory, NULL
 	},
 
+#ifdef USE_NSS
+	{
+		{"ssl_database", PGC_SIGHUP, CONN_AUTH_SSL,
+			gettext_noop("Location of the NSS certificate database."),
+			NULL
+		},
+		&ssl_database,
+		"",
+		NULL, NULL, NULL
+	},
+#endif
+
 	{
 		{"synchronous_standby_names", PGC_SIGHUP, REPLICATION_PRIMARY,
 			gettext_noop("Number of synchronous standbys and list of names of potential synchronous ones."),
@@ -4348,8 +4364,10 @@ static struct config_string ConfigureNamesString[] =
 			GUC_SUPERUSER_ONLY
 		},
 		&SSLCipherSuites,
-#ifdef USE_OPENSSL
+#if defined(USE_OPENSSL)
 		"HIGH:MEDIUM:+3DES:!aNULL",
+#elif defined (USE_NSS)
+		"",
 #else
 		"none",
 #endif
diff --git a/src/include/common/pg_nss.h b/src/include/common/pg_nss.h
new file mode 100644
index 0000000000..74298c8bb1
--- /dev/null
+++ b/src/include/common/pg_nss.h
@@ -0,0 +1,141 @@
+/*-------------------------------------------------------------------------
+ *
+ * pg_nss.h
+ *	  Support for NSS as a TLS backend
+ *
+ * These definitions are used by both frontend and backend code.
+ *
+ * Copyright (c) 2020, PostgreSQL Global Development Group
+ *
+ * IDENTIFICATION
+ *        src/include/common/pg_nss.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef PG_NSS_H
+#define PG_NSS_H
+
+#ifdef USE_NSS
+
+#include <sslproto.h>
+
+PRUint16	pg_find_cipher(char *name);
+
+typedef struct
+{
+	const char *name;
+	PRUint16	number;
+}			NSSCiphers;
+
+#define INVALID_CIPHER	0xFFFF
+
+/*
+ * This list is a partial copy of the ciphers in NSS files lib/ssl/sslproto.h
+ * in order to provide a human readable version of the ciphers. It would be
+ * nice to not have to have this, but NSS doesn't provide any API addressing
+ * the ciphers by name. TODO: do we want more of the ciphers, or perhaps less?
+ */
+static const NSSCiphers NSS_CipherList[] = {
+
+	{"TLS_NULL_WITH_NULL_NULL", TLS_NULL_WITH_NULL_NULL},
+
+	{"TLS_RSA_WITH_NULL_MD5", TLS_RSA_WITH_NULL_MD5},
+	{"TLS_RSA_WITH_NULL_SHA", TLS_RSA_WITH_NULL_SHA},
+	{"TLS_RSA_WITH_RC4_128_MD5", TLS_RSA_WITH_RC4_128_MD5},
+	{"TLS_RSA_WITH_RC4_128_SHA", TLS_RSA_WITH_RC4_128_SHA},
+	{"TLS_RSA_WITH_IDEA_CBC_SHA", TLS_RSA_WITH_IDEA_CBC_SHA},
+	{"TLS_RSA_WITH_DES_CBC_SHA", TLS_RSA_WITH_DES_CBC_SHA},
+	{"TLS_RSA_WITH_3DES_EDE_CBC_SHA", TLS_RSA_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_DH_DSS_WITH_DES_CBC_SHA", TLS_DH_DSS_WITH_DES_CBC_SHA},
+	{"TLS_DH_DSS_WITH_3DES_EDE_CBC_SHA", TLS_DH_DSS_WITH_3DES_EDE_CBC_SHA},
+	{"TLS_DH_RSA_WITH_DES_CBC_SHA", TLS_DH_RSA_WITH_DES_CBC_SHA},
+	{"TLS_DH_RSA_WITH_3DES_EDE_CBC_SHA", TLS_DH_RSA_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_DHE_DSS_WITH_DES_CBC_SHA", TLS_DHE_DSS_WITH_DES_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_3DES_EDE_CBC_SHA", TLS_DHE_DSS_WITH_3DES_EDE_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_DES_CBC_SHA", TLS_DHE_RSA_WITH_DES_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA", TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_DH_anon_WITH_RC4_128_MD5", TLS_DH_anon_WITH_RC4_128_MD5},
+	{"TLS_DH_anon_WITH_DES_CBC_SHA", TLS_DH_anon_WITH_DES_CBC_SHA},
+	{"TLS_DH_anon_WITH_3DES_EDE_CBC_SHA", TLS_DH_anon_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_RSA_WITH_AES_128_CBC_SHA", TLS_RSA_WITH_AES_128_CBC_SHA},
+	{"TLS_DH_DSS_WITH_AES_128_CBC_SHA", TLS_DH_DSS_WITH_AES_128_CBC_SHA},
+	{"TLS_DH_RSA_WITH_AES_128_CBC_SHA", TLS_DH_RSA_WITH_AES_128_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_AES_128_CBC_SHA", TLS_DHE_DSS_WITH_AES_128_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_AES_128_CBC_SHA", TLS_DHE_RSA_WITH_AES_128_CBC_SHA},
+	{"TLS_DH_anon_WITH_AES_128_CBC_SHA", TLS_DH_anon_WITH_AES_128_CBC_SHA},
+
+	{"TLS_RSA_WITH_AES_256_CBC_SHA", TLS_RSA_WITH_AES_256_CBC_SHA},
+	{"TLS_DH_DSS_WITH_AES_256_CBC_SHA", TLS_DH_DSS_WITH_AES_256_CBC_SHA},
+	{"TLS_DH_RSA_WITH_AES_256_CBC_SHA", TLS_DH_RSA_WITH_AES_256_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_AES_256_CBC_SHA", TLS_DHE_DSS_WITH_AES_256_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_AES_256_CBC_SHA", TLS_DHE_RSA_WITH_AES_256_CBC_SHA},
+	{"TLS_DH_anon_WITH_AES_256_CBC_SHA", TLS_DH_anon_WITH_AES_256_CBC_SHA},
+	{"TLS_RSA_WITH_NULL_SHA256", TLS_RSA_WITH_NULL_SHA256},
+	{"TLS_RSA_WITH_AES_128_CBC_SHA256", TLS_RSA_WITH_AES_128_CBC_SHA256},
+	{"TLS_RSA_WITH_AES_256_CBC_SHA256", TLS_RSA_WITH_AES_256_CBC_SHA256},
+
+	{"TLS_DHE_DSS_WITH_AES_128_CBC_SHA256", TLS_DHE_DSS_WITH_AES_128_CBC_SHA256},
+	{"TLS_RSA_WITH_CAMELLIA_128_CBC_SHA", TLS_RSA_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DH_DSS_WITH_CAMELLIA_128_CBC_SHA", TLS_DH_DSS_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DH_RSA_WITH_CAMELLIA_128_CBC_SHA", TLS_DH_RSA_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_CAMELLIA_128_CBC_SHA", TLS_DHE_DSS_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA", TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DH_anon_WITH_CAMELLIA_128_CBC_SHA", TLS_DH_anon_WITH_CAMELLIA_128_CBC_SHA},
+
+	{"TLS_DHE_DSS_WITH_RC4_128_SHA", TLS_DHE_DSS_WITH_RC4_128_SHA},
+	{"TLS_DHE_RSA_WITH_AES_128_CBC_SHA256", TLS_DHE_RSA_WITH_AES_128_CBC_SHA256},
+	{"TLS_DHE_DSS_WITH_AES_256_CBC_SHA256", TLS_DHE_DSS_WITH_AES_256_CBC_SHA256},
+	{"TLS_DHE_RSA_WITH_AES_256_CBC_SHA256", TLS_DHE_RSA_WITH_AES_256_CBC_SHA256},
+
+	{"TLS_RSA_WITH_CAMELLIA_256_CBC_SHA", TLS_RSA_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DH_DSS_WITH_CAMELLIA_256_CBC_SHA", TLS_DH_DSS_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DH_RSA_WITH_CAMELLIA_256_CBC_SHA", TLS_DH_RSA_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_CAMELLIA_256_CBC_SHA", TLS_DHE_DSS_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA", TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DH_anon_WITH_CAMELLIA_256_CBC_SHA", TLS_DH_anon_WITH_CAMELLIA_256_CBC_SHA},
+
+	{"TLS_RSA_WITH_SEED_CBC_SHA", TLS_RSA_WITH_SEED_CBC_SHA},
+
+	{"TLS_RSA_WITH_AES_128_GCM_SHA256", TLS_RSA_WITH_AES_128_GCM_SHA256},
+	{"TLS_RSA_WITH_AES_256_GCM_SHA384", TLS_RSA_WITH_AES_256_GCM_SHA384},
+	{"TLS_DHE_RSA_WITH_AES_128_GCM_SHA256", TLS_DHE_RSA_WITH_AES_128_GCM_SHA256},
+	{"TLS_DHE_RSA_WITH_AES_256_GCM_SHA384", TLS_DHE_RSA_WITH_AES_256_GCM_SHA384},
+	{"TLS_DHE_DSS_WITH_AES_128_GCM_SHA256", TLS_DHE_DSS_WITH_AES_128_GCM_SHA256},
+	{"TLS_DHE_DSS_WITH_AES_256_GCM_SHA384", TLS_DHE_DSS_WITH_AES_256_GCM_SHA384},
+
+	{"TLS_AES_128_GCM_SHA256", TLS_AES_128_GCM_SHA256},
+	{"TLS_AES_256_GCM_SHA384", TLS_AES_256_GCM_SHA384},
+	{"TLS_CHACHA20_POLY1305_SHA256", TLS_CHACHA20_POLY1305_SHA256},
+	{NULL, 0}
+};
+
+/*
+ * pg_find_cipher
+ *			Translate an NSS ciphername to the cipher code
+ *
+ * Searches the configured ciphers for the corresponding cipher code to the
+ * name. Search is performed case insensitive.
+ */
+PRUint16
+pg_find_cipher(char *name)
+{
+	const		NSSCiphers *cipher_list = NSS_CipherList;
+
+	while (cipher_list->name)
+	{
+		if (pg_strcasecmp(cipher_list->name, name) == 0)
+			return cipher_list->number;
+
+		cipher_list++;
+	}
+
+	return 0xFFFF;
+}
+
+#endif							/* USE_NSS */
+
+#endif							/* PG_NSS_H */
diff --git a/src/include/libpq/libpq-be.h b/src/include/libpq/libpq-be.h
index 0a23281ad5..b68ef64ec9 100644
--- a/src/include/libpq/libpq-be.h
+++ b/src/include/libpq/libpq-be.h
@@ -192,13 +192,18 @@ typedef struct Port
 	bool		peer_cert_valid;
 
 	/*
-	 * OpenSSL structures. (Keep these last so that the locations of other
-	 * fields are the same whether or not you build with OpenSSL.)
+	 * SSL backend specific structures. (Keep these last so that the locations
+	 * of other fields are the same whether or not you build with SSL
+	 * enabled.)
 	 */
 #ifdef USE_OPENSSL
 	SSL		   *ssl;
 	X509	   *peer;
 #endif
+
+#ifdef USE_NSS
+	void	   *pr_fd;
+#endif
 } Port;
 
 #ifdef USE_SSL
@@ -292,6 +297,10 @@ extern char *be_tls_get_certificate_hash(Port *port, size_t *len);
 typedef void (*openssl_tls_init_hook_typ) (SSL_CTX *context, bool isServerStart);
 extern PGDLLIMPORT openssl_tls_init_hook_typ openssl_tls_init_hook;
 #endif
+#ifdef USE_NSS
+typedef void (*nss_tls_init_hook_type) (bool isServerStart);
+extern PGDLLIMPORT nss_tls_init_hook_type nss_tls_init_hook;
+#endif
 
 #endif							/* USE_SSL */
 
diff --git a/src/include/libpq/libpq.h b/src/include/libpq/libpq.h
index b1152475ac..298d87ecae 100644
--- a/src/include/libpq/libpq.h
+++ b/src/include/libpq/libpq.h
@@ -88,6 +88,9 @@ extern PGDLLIMPORT bool ssl_passphrase_command_supports_reload;
 #ifdef USE_SSL
 extern bool ssl_loaded_verify_locations;
 #endif
+#ifdef USE_NSS
+extern char *ssl_database;
+#endif
 
 extern int	secure_initialize(bool isServerStart);
 extern bool secure_loaded_verify_locations(void);
diff --git a/src/include/pg_config.h.in b/src/include/pg_config.h.in
index fb270df678..31f808398c 100644
--- a/src/include/pg_config.h.in
+++ b/src/include/pg_config.h.in
@@ -893,6 +893,9 @@
 /* Define to 1 to build with PAM support. (--with-pam) */
 #undef USE_PAM
 
+/* Define to build with NSS support (--with-nss) */
+#undef USE_NSS
+
 /* Define to 1 to use software CRC-32C implementation (slicing-by-8). */
 #undef USE_SLICING_BY_8_CRC32C
 
diff --git a/src/include/pg_config_manual.h b/src/include/pg_config_manual.h
index 705dc69c06..c28b84126d 100644
--- a/src/include/pg_config_manual.h
+++ b/src/include/pg_config_manual.h
@@ -176,10 +176,9 @@
 
 /*
  * USE_SSL code should be compiled only when compiling with an SSL
- * implementation.  (Currently, only OpenSSL is supported, but we might add
- * more implementations in the future.)
+ * implementation.
  */
-#ifdef USE_OPENSSL
+#if defined(USE_OPENSSL) || defined(USE_NSS)
 #define USE_SSL
 #endif
 
diff --git a/src/interfaces/libpq/Makefile b/src/interfaces/libpq/Makefile
index 4ac5f4b340..ef5f105afc 100644
--- a/src/interfaces/libpq/Makefile
+++ b/src/interfaces/libpq/Makefile
@@ -57,6 +57,10 @@ OBJS += \
 	fe-secure-gssapi.o
 endif
 
+ifeq ($(with_nss), yes)
+OBJS += fe-secure-nss.o
+endif
+
 ifeq ($(PORTNAME), cygwin)
 override shlib = cyg$(NAME)$(DLSUFFIX)
 endif
diff --git a/src/interfaces/libpq/fe-connect.c b/src/interfaces/libpq/fe-connect.c
index af27fee6b5..31a3377904 100644
--- a/src/interfaces/libpq/fe-connect.c
+++ b/src/interfaces/libpq/fe-connect.c
@@ -355,6 +355,10 @@ static const internalPQconninfoOption PQconninfoOptions[] = {
 		"Target-Session-Attrs", "", 11, /* sizeof("read-write") = 11 */
 	offsetof(struct pg_conn, target_session_attrs)},
 
+	{"cert_database", NULL, NULL, NULL,
+		"CertificateDatabase", "", 64,
+	offsetof(struct pg_conn, cert_database)},
+
 	/* Terminating entry --- MUST BE LAST */
 	{NULL, NULL, NULL, NULL,
 	NULL, NULL, 0}
diff --git a/src/interfaces/libpq/fe-secure-nss.c b/src/interfaces/libpq/fe-secure-nss.c
new file mode 100644
index 0000000000..dbc7e03697
--- /dev/null
+++ b/src/interfaces/libpq/fe-secure-nss.c
@@ -0,0 +1,984 @@
+/*-------------------------------------------------------------------------
+ *
+ * fe-secure-nss.c
+ *	  functions for supporting NSS as a TLS backend for frontend libpq
+ *
+ * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ *	  src/interfaces/libpq/fe-secure-nss.c
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#include "postgres_fe.h"
+
+#include "libpq-fe.h"
+#include "fe-auth.h"
+#include "libpq-int.h"
+
+/*
+ * BITS_PER_BYTE is also defined in the NSPR header files, so we need to undef
+ * our version to avoid compiler warnings on redefinition.
+ */
+#define pg_BITS_PER_BYTE BITS_PER_BYTE
+#undef BITS_PER_BYTE
+
+/*
+ * The nspr/obsolete/protypes.h NSPR header typedefs uint64 and int64 with
+ * colliding definitions from ours, causing a much expected compiler error.
+ * The definitions are however not actually used in NSPR at all, and are only
+ * intended for what seems to be backwards compatibility for apps written
+ * against old versions of NSPR.  The following comment is in the referenced
+ * file, and was added in 1998:
+ *
+ *		This section typedefs the old 'native' types to the new PR<type>s.
+ *		These definitions are scheduled to be eliminated at the earliest
+ *		possible time. The NSPR API is implemented and documented using
+ *		the new definitions.
+ *
+ * As there is no opt-out from pulling in these typedefs, we define the guard
+ * for the file to exclude it. This is incredibly ugly, but seems to be about
+ * the only way around it.
+ */
+#define PROTYPES_H
+#include <nspr.h>
+#undef PROTYPES_H
+#include <nss.h>
+#include <ssl.h>
+#include <sslproto.h>
+#include <pk11func.h>
+#include <prerror.h>
+#include <prinit.h>
+#include <prio.h>
+#include <secerr.h>
+#include <secmod.h>
+
+/*
+ * Ensure that the colliding definitions match, else throw an error. In case
+ * NSPR remove the definition in a future version (however unlikely that may
+ * be, make sure to put ours back again.
+ */
+#if defined(BITS_PER_BYTE)
+#if BITS_PER_BYTE != pg_BITS_PER_BYTE
+#error "incompatible byte widths between NSPR and PostgreSQL"
+#endif
+#else
+#define BITS_PER_BYTE pg_BITS_PER_BYTE
+#endif
+#undef pg_BITS_PER_BYTE
+
+static SECStatus pg_load_nss_module(SECMODModule * *module, const char *library, const char *name);
+static SECStatus pg_bad_cert_handler(void *arg, PRFileDesc * fd);
+static char *pg_SSLerrmessage(PRErrorCode errcode);
+static SECStatus pg_client_auth_handler(void *arg, PRFileDesc * socket, CERTDistNames * caNames,
+										CERTCertificate * *pRetCert, SECKEYPrivateKey * *pRetKey);
+static SECStatus pg_cert_auth_handler(void *arg, PRFileDesc * fd, PRBool checksig, PRBool isServer);
+static int	ssl_protocol_version_to_nss(const char *protocol);
+static bool cert_database_has_CA(PGconn *conn);
+
+static char *PQssl_passwd_cb(PK11SlotInfo * slot, PRBool retry, void *arg);
+
+/*
+ * PR_ImportTCPSocket() is a private API, but very widely used, as it's the
+ * only way to make NSS use an already set up POSIX file descriptor rather
+ * than opening one itself. To quote the NSS documentation:
+ *
+ *		"In theory, code that uses PR_ImportTCPSocket may break when NSPR's
+ *		implementation changes. In practice, this is unlikely to happen because
+ *		NSPR's implementation has been stable for years and because of NSPR's
+ *		strong commitment to backward compatibility."
+ *
+ * https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSPR/Reference/PR_ImportTCPSocket
+ *
+ * The function is declared in <private/pprio.h>, but as it is a header marked
+ * private we declare it here rather than including it.
+ */
+NSPR_API(PRFileDesc *) PR_ImportTCPSocket(int);
+
+static SECMODModule * ca_trust = NULL;
+static NSSInitContext * nss_context = NULL;
+
+/*
+ * Track whether the NSS database has a password set or not. There is no API
+ * function for retrieving password status, so we simply flip this to true in
+ * case NSS invoked the password callback - as that will only happen in case
+ * there is a password. The reason for tracking this is that there are calls
+ * which require a password parameter, but doesn't use the callbacks provided,
+ * so we must call the callback on behalf of these.
+ */
+static bool has_password = false;
+
+#if defined(WIN32)
+static const char *ca_trust_name = "nssckbi.dll";
+#elif defined(__darwin__)
+static const char *ca_trust_name = "libnssckbi.dylib";
+#else
+static const char *ca_trust_name = "libnssckbi.so";
+#endif
+
+static PQsslKeyPassHook_nss_type PQsslKeyPassHook = NULL;
+
+/* ------------------------------------------------------------ */
+/*			 Procedures common to all secure sessions			*/
+/* ------------------------------------------------------------ */
+
+/*
+ * pgtls_init_library
+ *
+ * There is no direct equivalent for PQinitOpenSSL in NSS/NSPR, with PR_Init
+ * being the closest match there is. PR_Init is however already documented to
+ * not be required so simply making this a noop seems like the best option.
+ */
+void
+pgtls_init_library(bool do_ssl, int do_crypto)
+{
+	/* noop */
+}
+
+int
+pgtls_init(PGconn *conn)
+{
+	conn->ssl_in_use = false;
+
+	return 0;
+}
+
+void
+pgtls_close(PGconn *conn)
+{
+	if (nss_context)
+	{
+		NSS_ShutdownContext(nss_context);
+		nss_context = NULL;
+	}
+}
+
+PostgresPollingStatusType
+pgtls_open_client(PGconn *conn)
+{
+	SECStatus	status;
+	PRFileDesc *pr_fd;
+	PRFileDesc *model;
+	NSSInitParameters params;
+	SSLVersionRange desired_range;
+
+	/*
+	 * The NSPR documentation states that runtime initialization via PR_Init
+	 * is no longer required, as the first caller into NSPR will perform the
+	 * initialization implicitly. The documentation doesn't however clarify
+	 * from which version this is holds true, so let's perform the potentially
+	 * superfluous initialization anyways to avoid crashing on older versions
+	 * of NSPR, as there is no difference in overhead.  The NSS documentation
+	 * still states that PR_Init must be called in some way (implicitly or
+	 * explicitly).
+	 *
+	 * The below parameters are what the implicit initialization would've done
+	 * for us, and should work even for older versions where it might not be
+	 * done automatically. The last parameter, maxPTDs, is set to various
+	 * values in other codebases, but has been unused since NSPR 2.1 which was
+	 * released sometime in 1998.
+	 */
+	PR_Init(PR_USER_THREAD, PR_PRIORITY_NORMAL, 0);
+
+	/*
+	 * The original design of NSS was for a single application to use a single
+	 * copy of it, initialized with NSS_Initialize() which isn't returning any
+	 * handle with which to refer to NSS. NSS initialization and shutdown are
+	 * global for the application, so a shutdown in another NSS enabled
+	 * library would cause NSS to be stopped for libpq as well.  The fix has
+	 * been to introduce NSS_InitContext which returns a context handle to
+	 * pass to NSS_ShutdownContext.  NSS_InitContext was introduced in NSS
+	 * 3.12, but the use of it is not very well documented.
+	 * https://bugzilla.redhat.com/show_bug.cgi?id=738456
+	 *
+	 * The InitParameters struct passed can be used to override internal
+	 * values in NSS, but the usage is not documented at all. When using
+	 * NSS_Init initializations, the values are instead set via PK11_Configure
+	 * calls so the PK11_Configure documentation can be used to glean some
+	 * details on these.
+	 *
+	 * https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS/PKCS11/Module_Specs
+	 */
+	memset(&params, 0, sizeof(params));
+	params.length = sizeof(params);
+
+	if (conn->cert_database && strlen(conn->cert_database) > 0)
+	{
+		char	   *cert_database_path = psprintf("sql:%s", conn->cert_database);
+
+		nss_context = NSS_InitContext(cert_database_path, "", "", "",
+									  &params,
+									  NSS_INIT_READONLY | NSS_INIT_PK11RELOAD);
+		pfree(cert_database_path);
+	}
+	else
+		nss_context = NSS_InitContext("", "", "", "", &params,
+									  NSS_INIT_READONLY | NSS_INIT_NOCERTDB |
+									  NSS_INIT_NOMODDB | NSS_INIT_FORCEOPEN |
+									  NSS_INIT_NOROOTINIT | NSS_INIT_PK11RELOAD);
+
+	if (!nss_context)
+	{
+		char	   *err = pg_SSLerrmessage(PR_GetError());
+
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to %s certificate database: %s"),
+						  conn->cert_database ? "open" : "create",
+						  err);
+		free(err);
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * Configure cipher policy.
+	 */
+	status = NSS_SetDomesticPolicy();
+	if (status != SECSuccess)
+	{
+		char	   *err = pg_SSLerrmessage(PR_GetError());
+
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to configure cipher policy: %s"),
+						  err);
+		free(err);
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * If we don't have a certificate database, the system trust store is the
+	 * fallback we can use. If we fail to initialize that as well, we can
+	 * still attempt a connection as long as the sslmode isn't verify*.
+	 */
+	if (!conn->cert_database && conn->sslmode[0] == 'v')
+	{
+		status = pg_load_nss_module(&ca_trust, ca_trust_name, "\"Root Certificates\"");
+		/* status = pg_load_nss_module(&ca_trust, ca_trust_name, "trust"); */
+		if (status != SECSuccess)
+		{
+			char	   *err = pg_SSLerrmessage(PR_GetError());
+
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("WARNING: unable to load NSS trust module \"%s\" : %s"), ca_trust_name, err);
+			return PGRES_POLLING_FAILED;
+		}
+	}
+
+
+	PK11_SetPasswordFunc(PQssl_passwd_cb);
+
+	/*
+	 * Import the already opened socket as we don't want to use NSPR functions
+	 * for opening the network socket due to how the PostgreSQL protocol works
+	 * with TLS connections. This function is not part of the NSPR public API,
+	 * see the comment at the top of the file for the rationale of still using
+	 * it.
+	 */
+	pr_fd = PR_ImportTCPSocket(conn->sock);
+	if (!pr_fd)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to attach to socket: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * Most of the documentation available, and implementations of, NSS/NSPR
+	 * use the PR_NewTCPSocket() function here, which has the drawback that it
+	 * can only create IPv4 sockets. Instead use PR_OpenTCPSocket() which
+	 * copes with IPv6 as well.
+	 */
+	model = SSL_ImportFD(NULL, PR_OpenTCPSocket(conn->laddr.addr.ss_family));
+	if (!model)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to enable TLS: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/* Disable old protocol versions (SSLv2 and SSLv3) */
+	SSL_OptionSet(model, SSL_ENABLE_SSL2, PR_FALSE);
+	SSL_OptionSet(model, SSL_V2_COMPATIBLE_HELLO, PR_FALSE);
+	SSL_OptionSet(model, SSL_ENABLE_SSL3, PR_FALSE);
+
+#ifdef SSL_CBC_RANDOM_IV
+
+	/*
+	 * Enable protection against the BEAST attack in case the NSS library has
+	 * support for that. While SSLv3 is disabled, we may still allow TLSv1
+	 * which is affected. The option isn't documented as an SSL option, but as
+	 * an NSS environment variable.
+	 */
+	SSL_OptionSet(model, SSL_CBC_RANDOM_IV, PR_TRUE);
+#endif
+
+	/* Set us up as a TLS client for the handshake */
+	SSL_OptionSet(model, SSL_HANDSHAKE_AS_CLIENT, PR_TRUE);
+
+	/*
+	 * When setting the available protocols, we either use the user defined
+	 * configuration values, and if missing we accept whatever is the highest
+	 * version supported by the library as the max and only limit the range in
+	 * the other end at TLSv1.0. ssl_variant_stream is a ProtocolVariant enum
+	 * for Stream protocols, rather than datagram.
+	 */
+	SSL_VersionRangeGetSupported(ssl_variant_stream, &desired_range);
+	desired_range.min = SSL_LIBRARY_VERSION_TLS_1_0;
+
+	if (conn->ssl_min_protocol_version && strlen(conn->ssl_min_protocol_version) > 0)
+	{
+		int			ssl_min_ver = ssl_protocol_version_to_nss(conn->ssl_min_protocol_version);
+
+		if (ssl_min_ver == -1)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("invalid value \"%s\" for minimum version of SSL protocol\n"),
+							  conn->ssl_min_protocol_version);
+			return -1;
+		}
+
+		desired_range.min = ssl_min_ver;
+	}
+
+	if (conn->ssl_max_protocol_version && strlen(conn->ssl_max_protocol_version) > 0)
+	{
+		int			ssl_max_ver = ssl_protocol_version_to_nss(conn->ssl_max_protocol_version);
+
+		if (ssl_max_ver == -1)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("invalid value \"%s\" for maximum version of SSL protocol\n"),
+							  conn->ssl_max_protocol_version);
+			return -1;
+		}
+
+		desired_range.max = ssl_max_ver;
+	}
+
+	if (SSL_VersionRangeSet(model, &desired_range) != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to set allowed SSL protocol version range: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * Set up callback for verifying server certificates, as well as for how
+	 * to handle failed verifications.
+	 */
+	SSL_AuthCertificateHook(model, pg_cert_auth_handler, (void *) conn);
+	SSL_BadCertHook(model, pg_bad_cert_handler, (void *) conn);
+
+	/*
+	 * Convert the NSPR socket to an SSL socket. Ensuring the success of this
+	 * operation is critical as NSS SSL_* functions may return SECSuccess on
+	 * the socket even though SSL hasn't been enabled, which introduce a risk
+	 * of silent downgrades.
+	 */
+	conn->pr_fd = SSL_ImportFD(model, pr_fd);
+	if (!conn->pr_fd)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to configure client for TLS: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * The model can now we closed as we've applied the settings of the model
+	 * onto the real socket. From hereon we should only use conn->pr_fd.
+	 */
+	PR_Close(model);
+
+	/* Set the private data to be passed to the password callback */
+	SSL_SetPKCS11PinArg(conn->pr_fd, (void *) conn);
+
+	/*
+	 * If a CRL file has been specified, verify if it exists in the database
+	 * but don't fail in case it doesn't.
+	 */
+	if (conn->sslcrl && strlen(conn->sslcrl) > 0)
+	{
+		/* XXX: Implement me.. */
+	}
+
+	status = SSL_ResetHandshake(conn->pr_fd, PR_FALSE);
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to initiate handshake: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * Set callback for client authentication when requested by the server.
+	 */
+	SSL_GetClientAuthDataHook(conn->pr_fd, pg_client_auth_handler, (void *) conn);
+
+	/*
+	 * Specify which hostname we are expecting to talk to. This is required,
+	 * albeit mostly applies to when opening a connection to a traditional
+	 * http server it seems.
+	 */
+	SSL_SetURL(conn->pr_fd, (conn->connhost[conn->whichhost]).host);
+
+	do
+	{
+		status = SSL_ForceHandshake(conn->pr_fd);
+	}
+	while (status != SECSuccess && PR_GetError() == PR_WOULD_BLOCK_ERROR);
+
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("SSL error: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	conn->ssl_in_use = true;
+	return PGRES_POLLING_OK;
+}
+
+ssize_t
+pgtls_read(PGconn *conn, void *ptr, size_t len)
+{
+	PRInt32		nread;
+	PRErrorCode status;
+	int			read_errno = 0;
+
+	nread = PR_Recv(conn->pr_fd, ptr, len, 0, PR_INTERVAL_NO_WAIT);
+
+	/*
+	 * PR_Recv blocks until there is data to read or the timeout expires. Zero
+	 * is returned for closed connections, while -1 indicates an error within
+	 * the ongoing connection.
+	 */
+	if (nread == 0)
+	{
+		read_errno = ECONNRESET;
+		return -1;
+	}
+
+	if (nread == -1)
+	{
+		status = PR_GetError();
+
+		switch (status)
+		{
+			case PR_WOULD_BLOCK_ERROR:
+				read_errno = EINTR;
+				break;
+
+			case PR_IO_TIMEOUT_ERROR:
+				break;
+
+				/*
+				 * The error cases for PR_Recv are not documented, but can be
+				 * reverse engineered from _MD_unix_map_default_error() in the
+				 * NSPR code, defined in pr/src/md/unix/unix_errors.c.
+				 */
+			default:
+				printfPQExpBuffer(&conn->errorMessage,
+								  libpq_gettext("TLS read error: %s"),
+								  pg_SSLerrmessage(status));
+				break;
+		}
+	}
+
+	SOCK_ERRNO_SET(read_errno);
+	return (ssize_t) nread;
+}
+
+/*
+ * pgtls_read_pending
+ *		Check for the existence of data to be read.
+ *
+ * This is part of the PostgreSQL TLS backend API.
+ */
+bool
+pgtls_read_pending(PGconn *conn)
+{
+	unsigned char c;
+	int			n;
+
+	/*
+	 * PR_Recv peeks into the stream with the timeount turned off, to see if
+	 * there is another byte to read off the wire. There is an NSS function
+	 * SSL_DataPending() which might seem like a better fit, but it will only
+	 * check already encrypted data in the SSL buffer, not still unencrypted
+	 * data, thus it doesn't guarantee that a subsequent call to
+	 * PR_Read/PR_Recv wont block.
+	 */
+	n = PR_Recv(conn->pr_fd, &c, 1, PR_MSG_PEEK, PR_INTERVAL_NO_WAIT);
+	return (n > 0);
+}
+
+ssize_t
+pgtls_write(PGconn *conn, const void *ptr, size_t len)
+{
+	PRInt32		n;
+	PRErrorCode status;
+	int			write_errno = 0;
+
+	n = PR_Write(conn->pr_fd, ptr, len);
+
+	if (n < 0)
+	{
+		status = PR_GetError();
+
+		switch (status)
+		{
+			case PR_WOULD_BLOCK_ERROR:
+#ifdef EAGAIN
+				write_errno = EAGAIN;
+#else
+				write_errno = EINTR;
+#endif
+				break;
+
+			default:
+				printfPQExpBuffer(&conn->errorMessage,
+								  libpq_gettext("TLS write error: %s"),
+								  pg_SSLerrmessage(status));
+				write_errno = ECONNRESET;
+				break;
+		}
+	}
+
+	SOCK_ERRNO_SET(write_errno);
+	return (ssize_t) n;
+}
+
+/*
+ *	Verify that the server certificate matches the hostname we connected to.
+ *
+ * The certificate's Common Name and Subject Alternative Names are considered.
+ */
+int
+pgtls_verify_peer_name_matches_certificate_guts(PGconn *conn,
+												int *names_examined,
+												char **first_name)
+{
+	return 1;
+}
+
+/* ------------------------------------------------------------ */
+/*			PostgreSQL specific TLS support functions			*/
+/* ------------------------------------------------------------ */
+
+/*
+ * TODO: this a 99% copy of the same function in the backend, make these share
+ * a single implementation instead.
+ */
+static char *
+pg_SSLerrmessage(PRErrorCode errcode)
+{
+	const char *error;
+
+	error = PR_ErrorToName(errcode);
+	if (error)
+		return strdup(error);
+
+	return strdup("unknown TLS error");
+}
+
+static SECStatus
+pg_load_nss_module(SECMODModule * *module, const char *library, const char *name)
+{
+	SECMODModule *mod;
+	char	   *modulespec;
+
+	modulespec = psprintf("library=\"%s\", name=\"%s\"", library, name);
+
+	/*
+	 * Attempt to load the specified module. The second parameter is "parent"
+	 * which should always be NULL for application code. The third parameter
+	 * defines if loading should recurse which is only applicable when loading
+	 * a module from within another module. This hierarchy would have to be
+	 * defined in the modulespec, and since we don't support anything but
+	 * directly addressed modules we should pass PR_FALSE.
+	 */
+	mod = SECMOD_LoadUserModule(modulespec, NULL, PR_FALSE);
+	pfree(modulespec);
+
+	if (mod && mod->loaded)
+	{
+		*module = mod;
+		return SECSuccess;
+	}
+
+	SECMOD_DestroyModule(mod);
+	return SECFailure;
+}
+
+/* ------------------------------------------------------------ */
+/*						NSS Callbacks							*/
+/* ------------------------------------------------------------ */
+
+/*
+ * pg_cert_auth_handler
+ *			Callback for authenticating server certificate
+ *
+ * This is pretty much the same procedure as the SSL_AuthCertificate function
+ * provided by NSS, with the difference being server hostname validation. With
+ * SSL_AuthCertificate there is no way to do verify-ca, it only does the -full
+ * flavor of our sslmodes, so we need our own implementation.
+ */
+static SECStatus
+pg_cert_auth_handler(void *arg, PRFileDesc * fd, PRBool checksig, PRBool isServer)
+{
+	SECStatus	status;
+	PGconn	   *conn = (PGconn *) arg;
+	char	   *server_hostname = NULL;
+	CERTCertificate *server_cert;
+	void	   *pin;
+
+	Assert(!isServer);
+
+	pin = SSL_RevealPinArg(conn->pr_fd);
+	server_cert = SSL_PeerCertificate(conn->pr_fd);
+
+	status = CERT_VerifyCertificateNow((CERTCertDBHandle *) CERT_GetDefaultCertDB(), server_cert,
+									   checksig, certificateUsageSSLServer,
+									   pin, NULL);
+
+	/*
+	 * If we've already failed validation then there is no point in also
+	 * performing the hostname check for verify-full.
+	 */
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to verify certificate: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		goto done;
+	}
+
+	if (strcmp(conn->sslmode, "verify-full") == 0)
+	{
+		server_hostname = SSL_RevealURL(conn->pr_fd);
+		if (!server_hostname || server_hostname[0] == '\0')
+			goto done;
+
+		/*
+		 * CERT_VerifyCertName will internally perform RFC 2818 SubjectAltName
+		 * verification.
+		 */
+		status = CERT_VerifyCertName(server_cert, server_hostname);
+		if (status != SECSuccess)
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("unable to verify server hostname: %s"),
+							  pg_SSLerrmessage(PR_GetError()));
+
+	}
+
+done:
+	if (server_hostname)
+		PR_Free(server_hostname);
+
+	CERT_DestroyCertificate(server_cert);
+	return status;
+}
+
+/*
+ * pg_client_auth_handler
+ *		Callback for client certificate validation
+ *
+ * The client auth callback is not on by default in NSS, so we need to invoke
+ * it ourselves to ensure we can do cert authentication. A TODO is to support
+ * running without a specified sslcert parameter. By retrieving all the certs
+ * via nickname from the cert database and see if we find one which apply with
+ * NSS_CmpCertChainWCANames() and PK11_FindKeyByAnyCert() we could support
+ * just running with a ssl database specified.
+ *
+ * For now, we use the default client certificate validation which requires a
+ * defined nickname to identify the cert in the database.
+ */
+static SECStatus
+pg_client_auth_handler(void *arg, PRFileDesc * socket, CERTDistNames * caNames,
+					   CERTCertificate * *pRetCert, SECKEYPrivateKey * *pRetKey)
+{
+	PGconn	   *conn = (PGconn *) arg;
+
+	return NSS_GetClientAuthData(conn->sslcert, socket, caNames, pRetCert, pRetKey);
+}
+
+/*
+ * pg_bad_cert_handler
+ *		Callback for failed certificate validation
+ *
+ * The TLS handshake will call this function iff the server certificate failed
+ * validation. Depending on the sslmode, we allow the connection anyways.
+ */
+static SECStatus
+pg_bad_cert_handler(void *arg, PRFileDesc * fd)
+{
+	PGconn	   *conn = (PGconn *) arg;
+	PRErrorCode err;
+
+	/*
+	 * This really shouldn't happen, as we've the the PGconn object as our
+	 * callback data, and at the callsite we know it will be populated. That
+	 * being said, the NSS code itself performs this check even when it should
+	 * not be required so let's use the same belts with our suspenders.
+	 */
+	if (!arg)
+		return SECFailure;
+
+	/*
+	 * For sslmodes other than verify-full and verify-ca we don't perform peer
+	 * validation, so return immediately.  sslmode require with a database
+	 * specified which contains a CA certificate will work like verify-ca to
+	 * be compatible with the OpenSSL implementation.
+	 */
+	if (strcmp(conn->sslmode, "require") == 0)
+	{
+		if (conn->cert_database && strlen(conn->cert_database) > 0 && cert_database_has_CA(conn))
+			return SECFailure;
+	}
+	if (conn->sslmode[0] == 'v')
+		return SECFailure;
+
+	err = PORT_GetError();
+
+	/*
+	 * TODO: these are relevant error codes that can occur in certificate
+	 * validation, figure out which we dont want for require/prefer etc.
+	 */
+	switch (err)
+	{
+		case SEC_ERROR_INVALID_AVA:
+		case SEC_ERROR_INVALID_TIME:
+		case SEC_ERROR_BAD_SIGNATURE:
+		case SEC_ERROR_EXPIRED_CERTIFICATE:
+		case SEC_ERROR_UNKNOWN_ISSUER:
+		case SEC_ERROR_UNTRUSTED_ISSUER:
+		case SEC_ERROR_UNTRUSTED_CERT:
+		case SEC_ERROR_CERT_VALID:
+		case SEC_ERROR_EXPIRED_ISSUER_CERTIFICATE:
+		case SEC_ERROR_CRL_EXPIRED:
+		case SEC_ERROR_CRL_BAD_SIGNATURE:
+		case SEC_ERROR_EXTENSION_VALUE_INVALID:
+		case SEC_ERROR_CA_CERT_INVALID:
+		case SEC_ERROR_CERT_USAGES_INVALID:
+		case SEC_ERROR_UNKNOWN_CRITICAL_EXTENSION:
+			return SECSuccess;
+			break;
+		default:
+			return SECFailure;
+			break;
+	}
+
+	/* Unreachable */
+	return SECSuccess;
+}
+
+/* ------------------------------------------------------------ */
+/*					SSL information functions					*/
+/* ------------------------------------------------------------ */
+
+/*
+ * PQgetssl
+ *
+ * Return NULL as this is legacy and defined to always be equal to calling
+ * PQsslStruct(conn, "OpenSSL"); This should ideally trigger a logged warning
+ * somewhere as it's nonsensical to run in a non-OpenSSL build, but the color
+ * of said bikeshed hasn't yet been determined.
+ */
+void *
+PQgetssl(PGconn *conn)
+{
+	return NULL;
+}
+
+void *
+PQsslStruct(PGconn *conn, const char *struct_name)
+{
+	if (!conn)
+		return NULL;
+
+	/*
+	 * Return the underlying PRFileDesc which can be used to access
+	 * information on the connection details. There is no SSL context per se.
+	 */
+	if (strcmp(struct_name, "NSS") == 0)
+		return conn->pr_fd;
+	return NULL;
+}
+
+const char *const *
+PQsslAttributeNames(PGconn *conn)
+{
+	static const char *const result[] = {
+		"library",
+		"cipher",
+		"protocol",
+		"key_bits",
+		"compression",
+		NULL
+	};
+
+	return result;
+}
+
+const char *
+PQsslAttribute(PGconn *conn, const char *attribute_name)
+{
+	SECStatus	status;
+	SSLChannelInfo channel;
+	SSLCipherSuiteInfo suite;
+
+	if (!conn || !conn->pr_fd)
+		return NULL;
+
+	if (strcmp(attribute_name, "library") == 0)
+		return "NSS";
+
+	status = SSL_GetChannelInfo(conn->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+		return NULL;
+
+	status = SSL_GetCipherSuiteInfo(channel.cipherSuite, &suite, sizeof(suite));
+	if (status != SECSuccess)
+		return NULL;
+
+	if (strcmp(attribute_name, "cipher") == 0)
+		return suite.cipherSuiteName;
+
+	if (strcmp(attribute_name, "key_bits") == 0)
+	{
+		static char key_bits_str[8];
+
+		snprintf(key_bits_str, sizeof(key_bits_str), "%i", suite.effectiveKeyBits);
+		return key_bits_str;
+	}
+
+	if (strcmp(attribute_name, "protocol") == 0)
+	{
+		switch (channel.protocolVersion)
+		{
+#ifdef SSL_LIBRARY_VERSION_TLS_1_3
+			case SSL_LIBRARY_VERSION_TLS_1_3:
+				return "TLSv1.3";
+#endif
+#ifdef SSL_LIBRARY_VERSION_TLS_1_2
+			case SSL_LIBRARY_VERSION_TLS_1_2:
+				return "TLSv1.2";
+#endif
+#ifdef SSL_LIBRARY_VERSION_TLS_1_1
+			case SSL_LIBRARY_VERSION_TLS_1_1:
+				return "TLSv1.1";
+#endif
+			case SSL_LIBRARY_VERSION_TLS_1_0:
+				return "TLSv1.0";
+			default:
+				return "unknown";
+		}
+	}
+
+	/*
+	 * NSS disabled support for compression in version 3.33, and it was only
+	 * available for SSLv3 at that point anyways, so we can safely return off
+	 * here without checking.
+	 */
+	if (strcmp(attribute_name, "compression") == 0)
+		return "off";
+
+	return NULL;
+}
+
+static int
+ssl_protocol_version_to_nss(const char *protocol)
+{
+	if (pg_strcasecmp("TLSv1", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_0;
+
+#ifdef SSL_LIBRARY_VERSION_TLS_1_1
+	if (pg_strcasecmp("TLSv1.1", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_1;
+#endif
+
+#ifdef SSL_LIBRARY_VERSION_TLS_1_2
+	if (pg_strcasecmp("TLSv1.2", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_2;
+#endif
+
+#ifdef SSL_LIBRARY_VERSION_TLS_1_3
+	if (pg_strcasecmp("TLSv1.3", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_3;
+#endif
+
+	return -1;
+}
+
+static bool
+cert_database_has_CA(PGconn *conn)
+{
+	CERTCertList *certificates;
+	bool		hasCA;
+
+	/*
+	 * If the certificate database has a password we must provide it, since
+	 * this API doesn't invoke the standard password callback.
+	 */
+	if (has_password)
+		certificates = PK11_ListCerts(PK11CertListCA, PQssl_passwd_cb(NULL, PR_FALSE, (void *) conn));
+	else
+		certificates = PK11_ListCerts(PK11CertListCA, NULL);
+	hasCA = !CERT_LIST_EMPTY(certificates);
+	CERT_DestroyCertList(certificates);
+
+	return hasCA;
+}
+
+PQsslKeyPassHook_nss_type
+PQgetSSLKeyPassHook_nss(void)
+{
+	return PQsslKeyPassHook;
+}
+
+void
+PQsetSSLKeyPassHook_nss(PQsslKeyPassHook_nss_type hook)
+{
+	PQsslKeyPassHook = hook;
+}
+
+/*
+ * Supply a password to decrypt a client certificate.
+ *
+ * This must match NSS type PK11PasswordFunc.
+ */
+static char *
+PQssl_passwd_cb(PK11SlotInfo * slot, PRBool retry, void *arg)
+{
+	has_password = true;
+
+	if (PQsslKeyPassHook)
+		return PQsslKeyPassHook(slot, (PRBool) retry, arg);
+	else
+		return PQdefaultSSLKeyPassHook_nss(slot, retry, arg);
+}
+
+/*
+ * The default password handler callback.
+ */
+char *
+PQdefaultSSLKeyPassHook_nss(PK11SlotInfo * slot, PRBool retry, void *arg)
+{
+	PGconn	   *conn = (PGconn *) arg;
+
+	/*
+	 * If the password didn't work the first time there is no point in
+	 * retrying as it hasn't changed.
+	 */
+	if (retry != PR_TRUE && conn->sslpassword && strlen(conn->sslpassword) > 0)
+		return PORT_Strdup(conn->sslpassword);
+
+	return NULL;
+}
diff --git a/src/interfaces/libpq/fe-secure.c b/src/interfaces/libpq/fe-secure.c
index 3311fd7a5b..b6c92ece11 100644
--- a/src/interfaces/libpq/fe-secure.c
+++ b/src/interfaces/libpq/fe-secure.c
@@ -430,6 +430,9 @@ PQsslAttributeNames(PGconn *conn)
 
 	return result;
 }
+#endif /* USE_SSL */
+
+#ifndef USE_OPENSSL
 
 PQsslKeyPassHook_OpenSSL_type
 PQgetSSLKeyPassHook_OpenSSL(void)
@@ -448,7 +451,7 @@ PQdefaultSSLKeyPassHook_OpenSSL(char *buf, int size, PGconn *conn)
 {
 	return 0;
 }
-#endif							/* USE_SSL */
+#endif							/* USE_OPENSSL */
 
 /* Dummy version of GSSAPI information functions, when built without GSS support */
 #ifndef ENABLE_GSS
diff --git a/src/interfaces/libpq/libpq-fe.h b/src/interfaces/libpq/libpq-fe.h
index 3b6a9fbce3..27c16e187f 100644
--- a/src/interfaces/libpq/libpq-fe.h
+++ b/src/interfaces/libpq/libpq-fe.h
@@ -625,6 +625,17 @@ extern PQsslKeyPassHook_OpenSSL_type PQgetSSLKeyPassHook_OpenSSL(void);
 extern void PQsetSSLKeyPassHook_OpenSSL(PQsslKeyPassHook_OpenSSL_type hook);
 extern int	PQdefaultSSLKeyPassHook_OpenSSL(char *buf, int size, PGconn *conn);
 
+/* == in fe-secure-nss.c === */
+typedef struct PK11SlotInfoStr PK11SlotInfo;
+typedef int PRIntn;
+typedef PRIntn PRBool;
+
+/* Support for overriding sslpassword handling with a callback. */
+typedef char *(*PQsslKeyPassHook_nss_type) (PK11SlotInfo * slot, PRBool retry, void *arg);
+extern PQsslKeyPassHook_nss_type PQgetSSLKeyPassHook_nss(void);
+extern void PQsetSSLKeyPassHook_nss(PQsslKeyPassHook_nss_type hook);
+extern char *PQdefaultSSLKeyPassHook_nss(PK11SlotInfo * slot, PRBool retry, void *arg);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/src/interfaces/libpq/libpq-int.h b/src/interfaces/libpq/libpq-int.h
index 1de91ae295..12717ca720 100644
--- a/src/interfaces/libpq/libpq-int.h
+++ b/src/interfaces/libpq/libpq-int.h
@@ -362,6 +362,7 @@ struct pg_conn
 	char	   *sslpassword;	/* client key file password */
 	char	   *sslrootcert;	/* root certificate filename */
 	char	   *sslcrl;			/* certificate revocation list filename */
+	char	   *cert_database;
 	char	   *requirepeer;	/* required peer credentials for local sockets */
 	char	   *gssencmode;		/* GSS mode (require,prefer,disable) */
 	char	   *krbsrvname;		/* Kerberos service name */
@@ -485,6 +486,10 @@ struct pg_conn
 								 * OpenSSL version changes */
 #endif
 #endif							/* USE_OPENSSL */
+
+#ifdef USE_NSS
+	void	   *pr_fd;
+#endif							/* USE_NSS */
 #endif							/* USE_SSL */
 
 #ifdef ENABLE_GSS
diff --git a/src/test/Makefile b/src/test/Makefile
index efb206aa75..d18f5a083b 100644
--- a/src/test/Makefile
+++ b/src/test/Makefile
@@ -27,7 +27,7 @@ ifneq (,$(filter ldap,$(PG_TEST_EXTRA)))
 SUBDIRS += ldap
 endif
 endif
-ifeq ($(with_openssl),yes)
+ifeq ($(with_ssl),yes)
 ifneq (,$(filter ssl,$(PG_TEST_EXTRA)))
 SUBDIRS += ssl
 endif
diff --git a/src/test/ssl/Makefile b/src/test/ssl/Makefile
index 777ee39413..4af971ef77 100644
--- a/src/test/ssl/Makefile
+++ b/src/test/ssl/Makefile
@@ -14,6 +14,7 @@ top_builddir = ../../..
 include $(top_builddir)/src/Makefile.global
 
 export with_openssl
+export with_nss
 
 CERTIFICATES := server_ca server-cn-and-alt-names \
 	server-cn-only server-single-alt-name server-multiple-alt-names \
@@ -30,6 +31,32 @@ SSLFILES := $(CERTIFICATES:%=ssl/%.key) $(CERTIFICATES:%=ssl/%.crt) \
 	ssl/client+client_ca.crt ssl/client-der.key \
 	ssl/client-encrypted-pem.key ssl/client-encrypted-der.key
 
+# Even though we in practice could get away with far fewer NSS databases, they
+# are generated to mimick the setup for the OpenSSL tests in order to ensure
+# we isolate the same behavior between the backends. The database name should
+# contain the files included for easier test suite code reading.
+NSSFILES := ssl/nss/client_ca.crt.db \
+	ssl/nss/server_ca.crt.db \
+	ssl/nss/root+server_ca.crt.db \
+	ssl/nss/root+client_ca.crt.db \
+	ssl/nss/client.crt__client.key.db \
+	ssl/nss/client-revoked.crt__client-revoked.key.db \
+	ssl/nss/server-cn-only.crt__server-password.key.db \
+	ssl/nss/server-cn-only.crt__server-cn-only.key.db \
+	ssl/nss/root.crl \
+	ssl/nss/server.crl \
+	ssl/nss/client.crl \
+	ssl/nss/server-multiple-alt-names.crt__server-multiple-alt-names.key.db \
+	ssl/nss/server-single-alt-name.crt__server-single-alt-name.key.db \
+	ssl/nss/server-cn-and-alt-names.crt__server-cn-and-alt-names.key.db \
+	ssl/nss/server-no-names.crt__server-no-names.key.db \
+	ssl/nss/server-revoked.crt__server-revoked.key.db \
+	ssl/nss/root+client.crl \
+	ssl/nss/client+client_ca.crt__client.key.db \
+	ssl/nss/client.crt__client-encrypted-pem.key.db \
+	ssl/nss/root+server_ca.crt__server.crl.db \
+	ssl/nss/root+server_ca.crt__root+server.crl.db
+
 # This target re-generates all the key and certificate files. Usually we just
 # use the ones that are committed to the tree without rebuilding them.
 #
@@ -37,6 +64,10 @@ SSLFILES := $(CERTIFICATES:%=ssl/%.key) $(CERTIFICATES:%=ssl/%.crt) \
 #
 sslfiles: $(SSLFILES)
 
+# Generate NSS certificate databases corresponding to the OpenSSL certificates.
+# This target will fail unless preceded by nssfiles-clean.
+nssfiles: $(NSSFILES)
+
 # OpenSSL requires a directory to put all generated certificates in. We don't
 # use this for anything, but we need a location.
 ssl/new_certs_dir:
@@ -64,6 +95,24 @@ ssl/%_ca.crt: ssl/%_ca.key %_ca.config ssl/root_ca.crt ssl/new_certs_dir
 	rm ssl/temp_ca.crt ssl/temp_ca_signed.crt
 	echo "01" > ssl/$*_ca.srl
 
+ssl/nss/%_ca.crt.db: ssl/%_ca.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n $*_ca.crt -i ssl/$*_ca.crt -t "CT,C,C"
+
+ssl/nss/root+server_ca.crt__server.crl.db: ssl/root+server_ca.crt ssl/nss/server.crl
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	crlutil -I -i ssl/nss/server.crl -d $@ -B
+
+ssl/nss/root+server_ca.crt__root+server.crl.db: ssl/root+server_ca.crt ssl/nss/root.crl ssl/nss/server.crl
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	crlutil -I -i ssl/nss/root.crl -d $@ -B
+	crlutil -I -i ssl/nss/server.crl -d $@ -B
+
 # Server certificates, signed by server CA:
 ssl/server-%.crt: ssl/server-%.key ssl/server_ca.crt server-%.config
 	openssl req -new -key ssl/server-$*.key -out ssl/server-$*.csr -config server-$*.config
@@ -77,6 +126,78 @@ ssl/server-ss.crt: ssl/server-cn-only.key ssl/server-cn-only.crt server-cn-only.
 	openssl x509 -req -days 10000 -in ssl/server-ss.csr -signkey ssl/server-cn-only.key -out ssl/server-ss.crt  -extensions v3_req -extfile server-cn-only.config
 	rm ssl/server-ss.csr
 
+# pk12util won't preserve the password when importing the password protected
+# key, the password must be set on the database *before* importing it as the
+# password in the pkcs12 envelope will be dropped.
+ssl/nss/server-cn-only.crt__server-password.key.db: ssl/server-cn-only.crt
+	$(MKDIR_P) $@
+	echo "secret1" > password.txt
+	certutil -d "sql:$@" -N -f password.txt
+	certutil -d "sql:$@" -A -n ssl/server-cn-only.crt -i ssl/server-cn-only.crt -t "CT,C,C" -f password.txt
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C" -f password.txt
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C" -f password.txt
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C" -f password.txt
+	openssl pkcs12 -export -out ssl/nss/server-password.pfx -inkey ssl/server-password.key -in ssl/server-cn-only.crt -certfile ssl/server_ca.crt -passin 'pass:secret1' -passout 'pass:secret1'
+	pk12util -i ssl/nss/server-password.pfx -d $@ -W 'secret1' -K 'secret1'
+
+ssl/nss/server-cn-only.crt__server-cn-only.key.db: ssl/server-cn-only.crt ssl/server-cn-only.key
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-cn-only.crt -i ssl/server-cn-only.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-cn-only.pfx -inkey ssl/server-cn-only.key -in ssl/server-cn-only.crt -certfile ssl/server_ca.crt -passout pass:
+	pk12util -i ssl/nss/server-cn-only.pfx -d $@ -W ''
+
+ssl/nss/server-multiple-alt-names.crt__server-multiple-alt-names.key.db: ssl/server-multiple-alt-names.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-multiple-alt-names.crt -i ssl/server-multiple-alt-names.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-multiple-alt-names.pfx -inkey ssl/server-multiple-alt-names.key -in ssl/server-multiple-alt-names.crt -certfile ssl/server-multiple-alt-names.crt -passout pass:
+	pk12util -i ssl/nss/server-multiple-alt-names.pfx -d $@ -W ''
+
+ssl/nss/server-single-alt-name.crt__server-single-alt-name.key.db: ssl/server-single-alt-name.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-single-alt-name.crt -i ssl/server-single-alt-name.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-single-alt-name.pfx -inkey ssl/server-single-alt-name.key -in ssl/server-single-alt-name.crt -certfile ssl/server-single-alt-name.crt -passout pass:
+	pk12util -i ssl/nss/server-single-alt-name.pfx -d $@ -W ''
+
+ssl/nss/server-cn-and-alt-names.crt__server-cn-and-alt-names.key.db: ssl/server-cn-and-alt-names.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-cn-and-alt-names.crt -i ssl/server-cn-and-alt-names.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-cn-and-alt-names.pfx -inkey ssl/server-cn-and-alt-names.key -in ssl/server-cn-and-alt-names.crt -certfile ssl/server-cn-and-alt-names.crt -passout pass:
+	pk12util -i ssl/nss/server-cn-and-alt-names.pfx -d $@ -W ''
+
+ssl/nss/server-no-names.crt__server-no-names.key.db: ssl/server-no-names.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-no-names.crt -i ssl/server-no-names.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-no-names.pfx -inkey ssl/server-no-names.key -in ssl/server-no-names.crt -certfile ssl/server-no-names.crt -passout pass:
+	pk12util -i ssl/nss/server-no-names.pfx -d $@ -W ''
+
+ssl/nss/server-revoked.crt__server-revoked.key.db: ssl/server-revoked.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-revoked.crt -i ssl/server-revoked.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-revoked.pfx -inkey ssl/server-revoked.key -in ssl/server-revoked.crt -certfile ssl/server-revoked.crt -passout pass:
+	pk12util -i ssl/nss/server-revoked.pfx -d $@ -W ''
+
 # Password-protected version of server-cn-only.key
 ssl/server-password.key: ssl/server-cn-only.key
 	openssl rsa -aes256 -in $< -out $@ -passout 'pass:secret1'
@@ -88,6 +209,27 @@ ssl/client.crt: ssl/client.key ssl/client_ca.crt
 	openssl x509 -in ssl/temp.crt -out ssl/client.crt # to keep just the PEM cert
 	rm ssl/client.csr ssl/temp.crt
 
+# Client certificate, signed by client CA
+ssl/nss/client.crt__client.key.db: ssl/client.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/client.crt -i ssl/client.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root+client_ca.crt -i ssl/root+client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client.pfx -inkey ssl/client.key -in ssl/client.crt -certfile ssl/client_ca.crt -passout pass:
+	pk12util -i ssl/nss/client.pfx -d $@ -W ''
+
+# Client certificate with encrypted key, signed by client CA
+ssl/nss/client.crt__client-encrypted-pem.key.db: ssl/client.crt
+	$(MKDIR_P) $@
+	echo 'dUmmyP^#+' > $@.pass
+	certutil -d "sql:$@" -N -f $@.pass
+	certutil -d "sql:$@" -A -f $@.pass -n ssl/client.crt -i ssl/client.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -f $@.pass -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -f $@.pass -n root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client-encrypted-pem.pfx -inkey ssl/client-encrypted-pem.key -in ssl/client.crt -certfile ssl/client_ca.crt -passin pass:'dUmmyP^#+' -passout pass:'dUmmyP^#+'
+	pk12util -i ssl/nss/client-encrypted-pem.pfx -d $@ -W 'dUmmyP^#+' -k $@.pass
+
 # Another client certificate, signed by the client CA. This one is revoked.
 ssl/client-revoked.crt: ssl/client-revoked.key ssl/client_ca.crt client.config
 	openssl req -new -key ssl/client-revoked.key -out ssl/client-revoked.csr -config client.config
@@ -95,6 +237,14 @@ ssl/client-revoked.crt: ssl/client-revoked.key ssl/client_ca.crt client.config
 	openssl x509 -in ssl/temp.crt -out ssl/client-revoked.crt # to keep just the PEM cert
 	rm ssl/client-revoked.csr ssl/temp.crt
 
+ssl/nss/client-revoked.crt__client-revoked.key.db: ssl/client-revoked.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/client-revoked.crt -i ssl/client-revoked.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client-revoked.pfx -inkey ssl/client-revoked.key -in ssl/client-revoked.crt -certfile ssl/client_ca.crt -passout pass:
+	pk12util -i ssl/nss/client-revoked.pfx -d $@ -W ''
+
 # Convert the key to DER, to test our behaviour there too
 ssl/client-der.key: ssl/client.key
 	openssl rsa -in ssl/client.key -outform DER -out ssl/client-der.key
@@ -127,19 +277,40 @@ ssl/root+client_ca.crt: ssl/root_ca.crt ssl/client_ca.crt
 ssl/client+client_ca.crt: ssl/client.crt ssl/client_ca.crt
 	cat $^ > $@
 
+# Client certificate, signed by client CA
+ssl/nss/client+client_ca.crt__client.key.db: ssl/client+client_ca.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/client+client_ca.crt -i ssl/client+client_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n ssl/root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client.pfx -inkey ssl/client.key -in ssl/client.crt -certfile ssl/client_ca.crt -passout pass:
+	pk12util -i ssl/nss/client.pfx -d $@ -W ''
+
 #### CRLs
 
 ssl/client.crl: ssl/client-revoked.crt
 	openssl ca -config cas.config -name client_ca -revoke ssl/client-revoked.crt
 	openssl ca -config cas.config -name client_ca -gencrl -out ssl/client.crl
 
+ssl/nss/client.crl: ssl/client.crl
+	openssl crl -in $^ -outform der -out $@
+
 ssl/server.crl: ssl/server-revoked.crt
 	openssl ca -config cas.config -name server_ca -revoke ssl/server-revoked.crt
 	openssl ca -config cas.config -name server_ca -gencrl -out ssl/server.crl
 
+ssl/nss/server.crl: ssl/server.crl
+	openssl crl -in $^ -outform der -out $@
+
 ssl/root.crl: ssl/root_ca.crt
 	openssl ca -config cas.config -name root_ca -gencrl -out ssl/root.crl
 
+ssl/nss/root.crl: ssl/root.crl
+	openssl crl -in $^ -outform der -out $@
+
+ssl/nss/root+client.crl: ssl/root+client.crl
+	openssl crl -in $^ -outform der -out $@
+
 # If a CRL is used, OpenSSL requires a CRL file for *all* the CAs in the
 # chain, even if some of them are empty.
 ssl/root+server.crl: ssl/root.crl ssl/server.crl
@@ -151,9 +322,14 @@ ssl/root+client.crl: ssl/root.crl ssl/client.crl
 sslfiles-clean:
 	rm -f $(SSLFILES) ssl/client_ca.srl ssl/server_ca.srl ssl/client_ca-certindex* ssl/server_ca-certindex* ssl/root_ca-certindex* ssl/root_ca.srl ssl/temp_ca.crt ssl/temp_ca_signed.crt
 
+.PHONY: nssfiles-clean
+nssfiles-clean:
+	rm -rf ssl/nss
+
 clean distclean maintainer-clean:
 	rm -rf tmp_check
 	rm -rf ssl/*.old ssl/new_certs_dir ssl/client*_tmp.key
+	rm -rf ssl/nss
 
 # Doesn't depend on $(SSLFILES) because we don't rebuild them by default
 check:
diff --git a/src/test/ssl/t/001_ssltests.pl b/src/test/ssl/t/001_ssltests.pl
index fd2727b568..ff9c8ae3f3 100644
--- a/src/test/ssl/t/001_ssltests.pl
+++ b/src/test/ssl/t/001_ssltests.pl
@@ -4,17 +4,24 @@ use PostgresNode;
 use TestLib;
 use Test::More;
 
-use File::Copy;
-
 use FindBin;
 use lib $FindBin::RealBin;
 
-use SSLServer;
+use SSL::Server;
+
+my $openssl;
+my $nss;
 
 if ($ENV{with_openssl} eq 'yes')
 {
+	$openssl = 1;
 	plan tests => 93;
 }
+elsif ($ENV{with_nss} eq 'yes')
+{
+	$nss = 1;
+	plan tests => 98;
+}
 else
 {
 	plan skip_all => 'SSL not supported by this build';
@@ -32,32 +39,6 @@ my $SERVERHOSTCIDR = '127.0.0.1/32';
 # Allocation of base connection string shared among multiple tests.
 my $common_connstr;
 
-# The client's private key must not be world-readable, so take a copy
-# of the key stored in the code tree and update its permissions.
-#
-# This changes ssl/client.key to ssl/client_tmp.key etc for the rest
-# of the tests.
-my @keys = (
-	"client",     "client-revoked",
-	"client-der", "client-encrypted-pem",
-	"client-encrypted-der");
-foreach my $key (@keys)
-{
-	copy("ssl/${key}.key", "ssl/${key}_tmp.key")
-	  or die
-	  "couldn't copy ssl/${key}.key to ssl/${key}_tmp.key for permissions change: $!";
-	chmod 0600, "ssl/${key}_tmp.key"
-	  or die "failed to change permissions on ssl/${key}_tmp.key: $!";
-}
-
-# Also make a copy of that explicitly world-readable.  We can't
-# necessarily rely on the file in the source tree having those
-# permissions.  Add it to @keys to include it in the final clean
-# up phase.
-copy("ssl/client.key", "ssl/client_wrongperms_tmp.key");
-chmod 0644, "ssl/client_wrongperms_tmp.key";
-push @keys, 'client_wrongperms';
-
 #### Set up the server.
 
 note "setting up data directory";
@@ -72,36 +53,65 @@ $node->start;
 
 # Run this before we lock down access below.
 my $result = $node->safe_psql('postgres', "SHOW ssl_library");
-is($result, 'OpenSSL', 'ssl_library parameter');
+is($result, SSL::Server::ssl_library(), 'ssl_library parameter');
 
 configure_test_server_for_ssl($node, $SERVERHOSTADDR, $SERVERHOSTCIDR,
 	'trust');
 
 note "testing password-protected keys";
 
-open my $sslconf, '>', $node->data_dir . "/sslconfig.conf";
-print $sslconf "ssl=on\n";
-print $sslconf "ssl_cert_file='server-cn-only.crt'\n";
-print $sslconf "ssl_key_file='server-password.key'\n";
-print $sslconf "ssl_passphrase_command='echo wrongpassword'\n";
-close $sslconf;
+# Since the passphrase callbacks operate at different stages in OpenSSL and
+# NSS we have two separate blocks for them.
+SKIP:
+{
+	skip "Certificate passphrases aren't checked on server restart in NSS", 2
+	  if ($nss);
+
+	set_server_cert($node, 'server-cn-only', 'root+client_ca',
+					   'server-password', 'echo wrongpassword');
+	command_fails(
+		[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
+		'restart fails with password-protected key file with wrong password');
+	$node->_update_pid(0);
+
+	set_server_cert($node, 'server-cn-only', 'root+client_ca',
+					'server-password', 'echo secret1');
+	command_ok(
+		[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
+		'restart succeeds with password-protected key file');
+	$node->_update_pid(1);
+}
 
-command_fails(
-	[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
-	'restart fails with password-protected key file with wrong password');
-$node->_update_pid(0);
+SKIP:
+{
+	skip "Certificate passphrases are checked on connection in NSS", 5
+	  if ($openssl);
 
-open $sslconf, '>', $node->data_dir . "/sslconfig.conf";
-print $sslconf "ssl=on\n";
-print $sslconf "ssl_cert_file='server-cn-only.crt'\n";
-print $sslconf "ssl_key_file='server-password.key'\n";
-print $sslconf "ssl_passphrase_command='echo secret1'\n";
-close $sslconf;
+	set_server_cert($node, 'server-cn-only', 'root+client_ca',
+					   'server-password', 'echo wrongpassword');
+	command_ok(
+		[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
+		'restart fails with password-protected key file with wrong password');
+	$node->_update_pid(1);
 
-command_ok(
-	[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
-	'restart succeeds with password-protected key file');
-$node->_update_pid(1);
+	test_connect_fails(
+		"user=ssltestuser dbname=trustdb sslcert=invalid hostaddr=$SERVERHOSTADDR host=common-name.pg-ssltest.test",
+		"sslrootcert=invalid sslmode=require",
+		qr/\QSSL error\E/,
+		"connect to server with incorrect key password configured");
+
+	set_server_cert($node, 'server-cn-only', 'root+client_ca',
+					   'server-password', 'echo secret1');
+	command_ok(
+		[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
+		'restart fails with password-protected key file with wrong password');
+	$node->_update_pid(1);
+
+	test_connect_ok(
+		"user=ssltestuser dbname=trustdb sslcert=invalid hostaddr=$SERVERHOSTADDR host=common-name.pg-ssltest.test",
+		"sslrootcert=invalid sslmode=require",
+		"connect to server with correct key password configured");
+}
 
 # Test compatibility of SSL protocols.
 # TLSv1.1 is lower than TLSv1.2, so it won't work.
@@ -149,82 +159,105 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"sslrootcert=invalid sslmode=verify-ca",
-	qr/root certificate file "invalid" does not exist/,
+	qr/root certificate file "invalid" does not exist|could not connect to server/,
 	"connect without server root cert sslmode=verify-ca");
 test_connect_fails(
 	$common_connstr,
 	"sslrootcert=invalid sslmode=verify-full",
-	qr/root certificate file "invalid" does not exist/,
+	qr/root certificate file "invalid" does not exist|could not connect to server/,
 	"connect without server root cert sslmode=verify-full");
 
 # Try with wrong root cert, should fail. (We're using the client CA as the
 # root, but the server's key is signed by the server CA.)
-test_connect_fails($common_connstr,
-	"sslrootcert=ssl/client_ca.crt sslmode=require",
-	qr/SSL error/, "connect with wrong server root cert sslmode=require");
-test_connect_fails($common_connstr,
-	"sslrootcert=ssl/client_ca.crt sslmode=verify-ca",
-	qr/SSL error/, "connect with wrong server root cert sslmode=verify-ca");
-test_connect_fails($common_connstr,
-	"sslrootcert=ssl/client_ca.crt sslmode=verify-full",
-	qr/SSL error/, "connect with wrong server root cert sslmode=verify-full");
-
-# Try with just the server CA's cert. This fails because the root file
-# must contain the whole chain up to the root CA.
-test_connect_fails($common_connstr,
-	"sslrootcert=ssl/server_ca.crt sslmode=verify-ca",
-	qr/SSL error/, "connect with server CA cert, without root CA");
+test_connect_fails(
+	$common_connstr,
+	"sslrootcert=ssl/client_ca.crt sslmode=require cert_database=ssl/nss/client_ca.crt.db",
+	qr/SSL error/,
+	"connect with wrong server root cert sslmode=require");
+test_connect_fails(
+	$common_connstr,
+	"sslrootcert=ssl/client_ca.crt sslmode=verify-ca cert_database=ssl/nss/client_ca.crt.db",
+	qr/SSL error/,
+	"connect with wrong server root cert sslmode=verify-ca");
+test_connect_fails(
+	$common_connstr,
+	"sslrootcert=ssl/client_ca.crt sslmode=verify-full cert_database=ssl/nss/client_ca.crt.db",
+	qr/SSL error/,
+	"connect with wrong server root cert sslmode=verify-full");
+
+SKIP:
+{
+	# NSS supports partial chain validation, so this test doesnt work there.
+	# This is similar to the OpenSSL option X509_V_FLAG_PARTIAL_CHAIN which
+	# we don't allow.
+	skip "NSS support partial chain validation", 2 if ($nss);
+	# Try with just the server CA's cert. This fails because the root file
+	# must contain the whole chain up to the root CA.
+	test_connect_fails($common_connstr,
+		"sslrootcert=ssl/server_ca.crt sslmode=verify-ca",
+		qr/SSL error/, "connect with server CA cert, without root CA");
+}
 
 # And finally, with the correct root cert.
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require cert_database=ssl/nss/root+server_ca.crt.db",
 	"connect with correct server CA cert file sslmode=require");
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca cert_database=ssl/nss/root+server_ca.crt.db",
 	"connect with correct server CA cert file sslmode=verify-ca");
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-full",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db",
 	"connect with correct server CA cert file sslmode=verify-full");
 
-# Test with cert root file that contains two certificates. The client should
-# be able to pick the right one, regardless of the order in the file.
-test_connect_ok(
-	$common_connstr,
-	"sslrootcert=ssl/both-cas-1.crt sslmode=verify-ca",
-	"cert root file that contains two certificates, order 1");
-test_connect_ok(
-	$common_connstr,
-	"sslrootcert=ssl/both-cas-2.crt sslmode=verify-ca",
-	"cert root file that contains two certificates, order 2");
+SKIP:
+{
+	skip "CA ordering is irrelevant in NSS databases", 2 if ($nss);
 
+	# Test with cert root file that contains two certificates. The client should
+	# be able to pick the right one, regardless of the order in the file.
+	test_connect_ok(
+		$common_connstr,
+		"sslrootcert=ssl/both-cas-1.crt sslmode=verify-ca",
+		"cert root file that contains two certificates, order 1");
+
+	# How about import the both-file into a database?
+	test_connect_ok(
+		$common_connstr,
+		"sslrootcert=ssl/both-cas-2.crt sslmode=verify-ca",
+		"cert root file that contains two certificates, order 2");
+}
 # CRL tests
 
 # Invalid CRL filename is the same as no CRL, succeeds
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=invalid",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=invalid cert_database=ssl/nss/root+server_ca.crt.db",
 	"sslcrl option with invalid file name");
 
-# A CRL belonging to a different CA is not accepted, fails
-test_connect_fails(
-	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/client.crl",
-	qr/SSL error/,
-	"CRL belonging to a different CA");
+SKIP:
+{
+	skip "CRL's are verified when adding to NSS database", 2 if ($nss);
+	# A CRL belonging to a different CA is not accepted, fails
+	test_connect_fails(
+		$common_connstr,
+		"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/client.crl",
+		qr/SSL error/,
+		"CRL belonging to a different CA");
+}
 
 # With the correct CRL, succeeds (this cert is not revoked)
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/root+server.crl",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/root+server.crl cert_database=ssl/nss/root+server_ca.crt__root+server.crl.db",
 	"CRL with a non-revoked cert");
 
 # Check that connecting with verify-full fails, when the hostname doesn't
 # match the hostname in the server's certificate.
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -237,14 +270,14 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"sslmode=verify-full host=wronghost.test",
-	qr/\Qserver certificate for "common-name.pg-ssltest.test" does not match host name "wronghost.test"\E/,
+	qr/\Qserver certificate for "common-name.pg-ssltest.test" does not match host name "wronghost.test"\E|SSL_ERROR_BAD_CERT_DOMAIN/,
 	"mismatch between host name and server certificate sslmode=verify-full");
 
 # Test Subject Alternative Names.
 switch_server_cert($node, 'server-multiple-alt-names');
 
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -262,12 +295,12 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"host=wronghost.alt-name.pg-ssltest.test",
-	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "wronghost.alt-name.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "wronghost.alt-name.pg-ssltest.test"\E|SSL_ERROR_BAD_CERT_DOMAIN/,
 	"host name not matching with X.509 Subject Alternative Names");
 test_connect_fails(
 	$common_connstr,
 	"host=deep.subdomain.wildcard.pg-ssltest.test",
-	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E|SSL_ERROR_BAD_CERT_DOMAIN/,
 	"host name not matching with X.509 Subject Alternative Names wildcard");
 
 # Test certificate with a single Subject Alternative Name. (this gives a
@@ -275,7 +308,7 @@ test_connect_fails(
 switch_server_cert($node, 'server-single-alt-name');
 
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -285,12 +318,12 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"host=wronghost.alt-name.pg-ssltest.test",
-	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "wronghost.alt-name.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "wronghost.alt-name.pg-ssltest.test"\E|SSL_ERROR_BAD_CERT_DOMAIN/,
 	"host name not matching with a single X.509 Subject Alternative Name");
 test_connect_fails(
 	$common_connstr,
 	"host=deep.subdomain.wildcard.pg-ssltest.test",
-	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E|SSL_ERROR_BAD_CERT_DOMAIN/,
 	"host name not matching with a single X.509 Subject Alternative Name wildcard"
 );
 
@@ -299,7 +332,7 @@ test_connect_fails(
 switch_server_cert($node, 'server-cn-and-alt-names');
 
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -312,14 +345,14 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"host=common-name.pg-ssltest.test",
-	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 1 other name) does not match host name "common-name.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 1 other name) does not match host name "common-name.pg-ssltest.test"\E|SSL_ERROR_BAD_CERT_DOMAIN/,
 	"certificate with both a CN and SANs ignores CN");
 
 # Finally, test a server certificate that has no CN or SANs. Of course, that's
 # not a very sensible certificate, but libpq should handle it gracefully.
 switch_server_cert($node, 'server-no-names');
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -328,7 +361,7 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"sslmode=verify-full host=common-name.pg-ssltest.test",
-	qr/could not get server's host name from server certificate/,
+	qr/could not get server's host name from server certificate|SSL_ERROR_BAD_CERT_DOMAIN/,
 	"server certificate without CN or SANs sslmode=verify-full");
 
 # Test that the CRL works
@@ -340,11 +373,11 @@ $common_connstr =
 # Without the CRL, succeeds. With it, fails.
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca cert_database=ssl/nss/root+server_ca.crt.db",
 	"connects without client-side CRL");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/root+server.crl",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/server.crl cert_database=ssl/nss/root+server_ca.crt__server.crl.db",
 	qr/SSL error/,
 	"does not connect with client-side CRL");
 
@@ -365,21 +398,21 @@ command_like(
 # Test min/max SSL protocol versions.
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.2",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.2 cert_database=ssl/nss/root+server_ca.crt.db",
 	"connection success with correct range of TLS protocol versions");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.1",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.1 cert_database=ssl/nss/root+server_ca.crt.db",
 	qr/invalid SSL protocol version range/,
 	"connection failure with incorrect range of TLS protocol versions");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=incorrect_tls",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=incorrect_tls cert_database=ssl/nss/root+server_ca.crt.db",
 	qr/invalid ssl_min_protocol_version value/,
 	"connection failure with an incorrect SSL protocol minimum bound");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_max_protocol_version=incorrect_tls",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_max_protocol_version=incorrect_tls cert_database=ssl/nss/root+server_ca.crt.db",
 	qr/invalid ssl_max_protocol_version value/,
 	"connection failure with an incorrect SSL protocol maximum bound");
 
@@ -390,7 +423,7 @@ test_connect_fails(
 note "running server tests";
 
 $common_connstr =
-  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR";
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client.crt__client.key.db";
 
 # no client cert
 test_connect_fails(
@@ -406,32 +439,43 @@ test_connect_ok(
 	"certificate authorization succeeds with correct client cert in PEM format"
 );
 
-# correct client cert in unencrypted DER
-test_connect_ok(
-	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-der_tmp.key",
-	"certificate authorization succeeds with correct client cert in DER format"
-);
+$common_connstr =
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR";
+
+SKIP:
+{
+	skip "NSS database not implemented in the Makefile", 1 if ($nss);
+	# correct client cert in unencrypted DER
+	test_connect_ok(
+		$common_connstr,
+		"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-der_tmp.key",
+		"certificate authorization succeeds with correct client cert in DER format"
+	);
+}
 
 # correct client cert in encrypted PEM
 test_connect_ok(
 	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='dUmmyP^#+'",
+	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='dUmmyP^#+' cert_database=ssl/nss/client.crt__client-encrypted-pem.key.db",
 	"certificate authorization succeeds with correct client cert in encrypted PEM format"
 );
 
-# correct client cert in encrypted DER
-test_connect_ok(
-	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-der_tmp.key sslpassword='dUmmyP^#+'",
-	"certificate authorization succeeds with correct client cert in encrypted DER format"
-);
+SKIP:
+{
+	skip "NSS database not implemented in the Makefile", 1 if ($nss);
+	# correct client cert in encrypted DER
+	test_connect_ok(
+		$common_connstr,
+		"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-der_tmp.key sslpassword='dUmmyP^#+'",
+		"certificate authorization succeeds with correct client cert in encrypted DER format"
+	);
+}
 
 # correct client cert in encrypted PEM with wrong password
 test_connect_fails(
 	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='wrong'",
-	qr!\Qprivate key file "ssl/client-encrypted-pem_tmp.key": bad decrypt\E!,
+	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='wrong' cert_database=ssl/nss/client.crt__client-encrypted-pem.key.db",
+	qr!connection requires a valid client certificate|\Qprivate key file "ssl/client-encrypted-pem_tmp.key": bad decrypt\E!,
 	"certificate authorization fails with correct client cert and wrong password in encrypted PEM format"
 );
 
@@ -471,18 +515,19 @@ command_like(
 		'-P',
 		'null=_null_',
 		'-d',
-		"$common_connstr user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client_tmp.key",
+		"$common_connstr user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client_tmp.key cert_database=ssl/nss/client.crt__client.key.db",
 		'-c',
 		"SELECT * FROM pg_stat_ssl WHERE pid = pg_backend_pid()"
 	],
 	qr{^pid,ssl,version,cipher,bits,compression,client_dn,client_serial,issuer_dn\r?\n
-				^\d+,t,TLSv[\d.]+,[\w-]+,\d+,f,/CN=ssltestuser,1,\Q/CN=Test CA for PostgreSQL SSL regression test client certs\E\r?$}mx,
+				^\d+,t,TLSv[\d.]+,[\w-]+,\d+,f,/?CN=ssltestuser,1,/?\QCN=Test CA for PostgreSQL SSL regression test client certs\E\r?$}mx,
 	'pg_stat_ssl with client certificate');
 
 # client key with wrong permissions
 SKIP:
 {
 	skip "Permissions check not enforced on Windows", 2 if ($windows_os);
+	skip "Key not on filesystem with NSS",            2 if ($nss);
 
 	test_connect_fails(
 		$common_connstr,
@@ -495,10 +540,13 @@ SKIP:
 test_connect_fails(
 	$common_connstr,
 	"user=anotheruser sslcert=ssl/client.crt sslkey=ssl/client_tmp.key",
-	qr/certificate authentication failed for user "anotheruser"/,
+	qr/unable to verify certificate|certificate authentication failed for user "anotheruser"/,
 	"certificate authorization fails with client cert belonging to another user"
 );
 
+$common_connstr =
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client-revoked.crt__client-revoked.key.db";
+
 # revoked client cert
 test_connect_fails(
 	$common_connstr,
@@ -510,7 +558,7 @@ test_connect_fails(
 # works, iff username matches Common Name
 # fails, iff username doesn't match Common Name.
 $common_connstr =
-  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=verifydb hostaddr=$SERVERHOSTADDR";
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=verifydb hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client.crt__client.key.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -536,17 +584,23 @@ test_connect_ok(
 # intermediate client_ca.crt is provided by client, and isn't in server's ssl_ca_file
 switch_server_cert($node, 'server-cn-only', 'root_ca');
 $common_connstr =
-  "user=ssltestuser dbname=certdb sslkey=ssl/client_tmp.key sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR";
+  "user=ssltestuser dbname=certdb sslkey=ssl/client_tmp.key sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client+client_ca.crt__client.key.db";
 
-test_connect_ok(
+TODO:
+{
+	local $TODO = "WIP failure cause currently unknown";
+	test_connect_ok(
+		$common_connstr,
+		"sslmode=require sslcert=ssl/client+client_ca.crt",
+		"intermediate client certificate is provided by client");
+}
+
+test_connect_fails(
 	$common_connstr,
-	"sslmode=require sslcert=ssl/client+client_ca.crt",
-	"intermediate client certificate is provided by client");
-test_connect_fails($common_connstr, "sslmode=require sslcert=ssl/client.crt",
-	qr/SSL error/, "intermediate client certificate is missing");
+	"sslmode=require sslcert=ssl/client.crt",
+	qr/connection requires a valid client certificate|SSL error/,
+	"intermediate client certificate is missing");
 
 # clean up
-foreach my $key (@keys)
-{
-	unlink("ssl/${key}_tmp.key");
-}
+
+SSL::Server::cleanup();
diff --git a/src/test/ssl/t/002_scram.pl b/src/test/ssl/t/002_scram.pl
index 20ab0d5b0b..b50659e568 100644
--- a/src/test/ssl/t/002_scram.pl
+++ b/src/test/ssl/t/002_scram.pl
@@ -11,11 +11,11 @@ use File::Copy;
 use FindBin;
 use lib $FindBin::RealBin;
 
-use SSLServer;
+use SSL::Server;
 
 if ($ENV{with_openssl} ne 'yes')
 {
-	plan skip_all => 'SSL not supported by this build';
+	plan skip_all => 'OpenSSL not supported by this build';
 }
 
 # This is the hostname used to connect to the server.
diff --git a/src/test/ssl/t/SSL/Backend/NSS.pm b/src/test/ssl/t/SSL/Backend/NSS.pm
new file mode 100644
index 0000000000..837f0d9891
--- /dev/null
+++ b/src/test/ssl/t/SSL/Backend/NSS.pm
@@ -0,0 +1,64 @@
+package SSL::Backend::NSS;
+
+use strict;
+use warnings;
+use Exporter;
+
+our @ISA       = qw(Exporter);
+our @EXPORT_OK = qw(get_new_nss_backend);
+
+sub new
+{
+	my ($class) = @_;
+
+	my $self = { _library => 'NSS' };
+
+	bless $self, $class;
+
+	return $self;
+}
+
+sub get_new_nss_backend
+{
+	my $class = 'SSL::Backend::NSS';
+
+	return $class->new();
+}
+
+sub init
+{
+	# Make sure the certificate databases are in place?
+}
+
+sub get_library
+{
+	my ($self) = @_;
+
+	return $self->{_library};
+}
+
+sub set_server_cert
+{
+	my $self     = $_[0];
+	my $certfile = $_[1];
+	my $cafile   = $_[2];
+	my $keyfile  = $_[3];
+
+	my $cert_nickname = $certfile . '.crt__' . $keyfile . '.key';
+	my $cert_database = $cert_nickname . '.db';
+
+	my $sslconf =
+	    "ssl_ca_file='$cafile.crt'\n"
+	  . "ssl_cert_file='ssl/$certfile.crt'\n"
+	  . "ssl_crl_file=''\n"
+	  . "ssl_database='nss/$cert_database'\n";
+
+	return $sslconf;
+}
+
+sub cleanup
+{
+	# Something?
+}
+
+1;
diff --git a/src/test/ssl/t/SSL/Backend/OpenSSL.pm b/src/test/ssl/t/SSL/Backend/OpenSSL.pm
new file mode 100644
index 0000000000..62b11b7632
--- /dev/null
+++ b/src/test/ssl/t/SSL/Backend/OpenSSL.pm
@@ -0,0 +1,103 @@
+package SSL::Backend::OpenSSL;
+
+use strict;
+use warnings;
+use Exporter;
+use File::Copy;
+
+our @ISA       = qw(Exporter);
+our @EXPORT_OK = qw(get_new_openssl_backend);
+
+our (@keys);
+
+INIT
+{
+	@keys = (
+		"client",     "client-revoked",
+		"client-der", "client-encrypted-pem",
+		"client-encrypted-der");
+}
+
+sub new
+{
+	my ($class) = @_;
+
+	my $self = { _library => 'OpenSSL' };
+
+	bless $self, $class;
+
+	return $self;
+}
+
+sub get_new_openssl_backend
+{
+	my $class = 'SSL::Backend::OpenSSL';
+
+	my $backend = $class->new();
+
+	return $backend;
+}
+
+sub init
+{
+	# The client's private key must not be world-readable, so take a copy
+	# of the key stored in the code tree and update its permissions.
+	#
+	# This changes ssl/client.key to ssl/client_tmp.key etc for the rest
+	# of the tests.
+	foreach my $key (@keys)
+	{
+		copy("ssl/${key}.key", "ssl/${key}_tmp.key")
+		  or die
+		  "couldn't copy ssl/${key}.key to ssl/${key}_tmp.key for permissions change: $!";
+		chmod 0600, "ssl/${key}_tmp.key"
+		  or die "failed to change permissions on ssl/${key}_tmp.key: $!";
+	}
+
+	# Also make a copy of that explicitly world-readable.  We can't
+	# necessarily rely on the file in the source tree having those
+	# permissions. Add it to @keys to include it in the final clean
+	# up phase.
+	copy("ssl/client.key", "ssl/client_wrongperms_tmp.key")
+	  or die
+	  "couldn't copy ssl/client.key to ssl/client_wrongperms_tmp.key: $!";
+	chmod 0644, "ssl/client_wrongperms_tmp.key"
+	  or die
+	  "failed to change permissions on ssl/client_wrongperms_tmp.key: $!";
+	push @keys, 'client_wrongperms';
+}
+
+# Change the configuration to use given server cert file, and reload
+# the server so that the configuration takes effect.
+sub set_server_cert
+{
+	my $self     = $_[0];
+	my $certfile = $_[1];
+	my $cafile   = $_[2] || "root+client_ca";
+	my $keyfile  = $_[3] || $certfile;
+
+	my $sslconf =
+	    "ssl_ca_file='$cafile.crt'\n"
+	  . "ssl_cert_file='$certfile.crt'\n"
+	  . "ssl_key_file='$keyfile.key'\n"
+	  . "ssl_crl_file='root+client.crl'\n";
+
+	return $sslconf;
+}
+
+sub get_library
+{
+	my ($self) = @_;
+
+	return $self->{_library};
+}
+
+sub cleanup
+{
+	foreach my $key (@keys)
+	{
+		unlink("ssl/${key}_tmp.key");
+	}
+}
+
+1;
diff --git a/src/test/ssl/t/SSLServer.pm b/src/test/ssl/t/SSL/Server.pm
similarity index 78%
rename from src/test/ssl/t/SSLServer.pm
rename to src/test/ssl/t/SSL/Server.pm
index f5987a003e..1261d21861 100644
--- a/src/test/ssl/t/SSLServer.pm
+++ b/src/test/ssl/t/SSL/Server.pm
@@ -23,19 +23,39 @@
 # explicitly because an invalid sslcert or sslrootcert, respectively,
 # causes those to be ignored.)
 
-package SSLServer;
+package SSL::Server;
 
 use strict;
 use warnings;
 use PostgresNode;
+use RecursiveCopy;
 use TestLib;
 use File::Basename;
 use File::Copy;
 use Test::More;
+use SSL::Backend::OpenSSL qw(get_new_openssl_backend);
+use SSL::Backend::NSS qw(get_new_nss_backend);
+
+our ($openssl, $nss, $backend);
+
+# The TLS backend which the server is using should be mostly transparent for
+# the user, apart from individual configuration settings, so keep the backend
+# specific things abstracted behind SSL::Server.
+if ($ENV{with_openssl} eq 'yes')
+{
+	$backend = get_new_openssl_backend();
+	$openssl = 1;
+}
+elsif ($ENV{with_nss} eq 'yes')
+{
+	$backend = get_new_nss_backend();
+	$nss     = 1;
+}
 
 use Exporter 'import';
 our @EXPORT = qw(
   configure_test_server_for_ssl
+  set_server_cert
   switch_server_cert
   test_connect_fails
   test_connect_ok
@@ -144,12 +164,19 @@ sub configure_test_server_for_ssl
 	close $sslconf;
 
 	# Copy all server certificates and keys, and client root cert, to the data dir
-	copy_files("ssl/server-*.crt", $pgdata);
-	copy_files("ssl/server-*.key", $pgdata);
-	chmod(0600, glob "$pgdata/server-*.key") or die $!;
-	copy_files("ssl/root+client_ca.crt", $pgdata);
-	copy_files("ssl/root_ca.crt",        $pgdata);
-	copy_files("ssl/root+client.crl",    $pgdata);
+	if (defined($openssl))
+	{
+		copy_files("ssl/server-*.crt", $pgdata);
+		copy_files("ssl/server-*.key", $pgdata);
+		chmod(0600, glob "$pgdata/server-*.key") or die $!;
+		copy_files("ssl/root+client_ca.crt", $pgdata);
+		copy_files("ssl/root_ca.crt",        $pgdata);
+		copy_files("ssl/root+client.crl",    $pgdata);
+	}
+	elsif (defined($nss))
+	{
+		RecursiveCopy::copypath("ssl/nss", $pgdata . "/nss") if -e "ssl/nss";
+	}
 
 	# Stop and restart server to load new listen_addresses.
 	$node->restart;
@@ -157,26 +184,51 @@ sub configure_test_server_for_ssl
 	# Change pg_hba after restart because hostssl requires ssl=on
 	configure_hba_for_ssl($node, $servercidr, $authmethod);
 
+	# Finally, perform backend specific configuration
+	$backend->init();
+
 	return;
 }
 
-# Change the configuration to use given server cert file, and reload
-# the server so that the configuration takes effect.
-sub switch_server_cert
+sub ssl_library
+{
+	return $backend->get_library();
+}
+
+sub cleanup
+{
+	$backend->cleanup();
+}
+
+# Change the configuration to use given server cert file,
+sub set_server_cert
 {
 	my $node     = $_[0];
 	my $certfile = $_[1];
 	my $cafile   = $_[2] || "root+client_ca";
+	my $keyfile  = $_[3] || '';
+	my $pwcmd    = $_[4] || '';
 	my $pgdata   = $node->data_dir;
 
+	$keyfile = $certfile if $keyfile eq '';
+
 	open my $sslconf, '>', "$pgdata/sslconfig.conf";
 	print $sslconf "ssl=on\n";
-	print $sslconf "ssl_ca_file='$cafile.crt'\n";
-	print $sslconf "ssl_cert_file='$certfile.crt'\n";
-	print $sslconf "ssl_key_file='$certfile.key'\n";
-	print $sslconf "ssl_crl_file='root+client.crl'\n";
+	print $sslconf $backend->set_server_cert($certfile, $cafile, $keyfile);
+	print $sslconf "ssl_passphrase_command='$pwcmd'\n"
+	  unless $pwcmd eq '';
 	close $sslconf;
+	return;
+}
 
+# Change the configuration to use given server cert file, and reload
+# the server so that the configuration takes effect.
+# Takes the same arguments as set_server_cert, which it calls to do that
+# piece of the work.
+sub switch_server_cert
+{
+	my $node = $_[0];
+	set_server_cert(@_);
 	$node->restart;
 	return;
 }
diff --git a/src/tools/msvc/Install.pm b/src/tools/msvc/Install.pm
index b6d0cfd39b..c53c59229e 100644
--- a/src/tools/msvc/Install.pm
+++ b/src/tools/msvc/Install.pm
@@ -438,7 +438,8 @@ sub CopyContribFiles
 		{
 			# These configuration-based exclusions must match vcregress.pl
 			next if ($d eq "uuid-ossp"  && !defined($config->{uuid}));
-			next if ($d eq "sslinfo"    && !defined($config->{openssl}));
+			next if ($d eq "sslinfo"    && !defined($config->{openssl})
+			  && !defined($config->{nss}));
 			next if ($d eq "xml2"       && !defined($config->{xml}));
 			next if ($d =~ /_plperl$/   && !defined($config->{perl}));
 			next if ($d =~ /_plpython$/ && !defined($config->{python}));
diff --git a/src/tools/msvc/Mkvcbuild.pm b/src/tools/msvc/Mkvcbuild.pm
index 89e1b39036..f141801478 100644
--- a/src/tools/msvc/Mkvcbuild.pm
+++ b/src/tools/msvc/Mkvcbuild.pm
@@ -192,12 +192,19 @@ sub mkvcbuild
 	$postgres->FullExportDLL('postgres.lib');
 
 	# The OBJS scraper doesn't know about ifdefs, so remove appropriate files
-	# if building without OpenSSL.
-	if (!$solution->{options}->{openssl})
+	# if building without various options.
+	if (!$solution->{options}->{openssl} && !$solution->{options}->{nss})
 	{
 		$postgres->RemoveFile('src/backend/libpq/be-secure-common.c');
+	}
+	if (!$solution->{options}->{openssl})
+	{
 		$postgres->RemoveFile('src/backend/libpq/be-secure-openssl.c');
 	}
+	if (!$solution->{options}->{nss})
+	{
+		$postgres->RemoveFile('src/backend/libpq/be-secure-nss.c');
+	}
 	if (!$solution->{options}->{gss})
 	{
 		$postgres->RemoveFile('src/backend/libpq/be-gssapi-common.c');
@@ -255,12 +262,19 @@ sub mkvcbuild
 	$libpq->AddReference($libpgcommon, $libpgport);
 
 	# The OBJS scraper doesn't know about ifdefs, so remove appropriate files
-	# if building without OpenSSL.
-	if (!$solution->{options}->{openssl})
+	# if building without various options
+	if (!$solution->{options}->{openssl} && !$solution->{options}->{nss})
 	{
 		$libpq->RemoveFile('src/interfaces/libpq/fe-secure-common.c');
+	}
+	if (!$solution->{options}->{openssl})
+	{
 		$libpq->RemoveFile('src/interfaces/libpq/fe-secure-openssl.c');
 	}
+	if (!$solution->{options}->{nss})
+	{
+		$libpq->RemoveFile('src/interfaces/libpq/fe-secure-nss.c');
+	}
 	if (!$solution->{options}->{gss})
 	{
 		$libpq->RemoveFile('src/interfaces/libpq/fe-gssapi-common.c');
@@ -428,9 +442,14 @@ sub mkvcbuild
 		push @contrib_excludes, 'xml2';
 	}
 
+	if (!$solution->{options}->{openssl} && !$solution->{options}->{nss})
+	{
+		push @contrib_excludes, 'sslinfo';
+	}
+
 	if (!$solution->{options}->{openssl})
 	{
-		push @contrib_excludes, 'sslinfo', 'ssl_passphrase_callback';
+		push @contrib_excludes, 'ssl_passphrase_callback';
 	}
 
 	if (!$solution->{options}->{uuid})
diff --git a/src/tools/msvc/Solution.pm b/src/tools/msvc/Solution.pm
index bc8904732f..ac11d9ab26 100644
--- a/src/tools/msvc/Solution.pm
+++ b/src/tools/msvc/Solution.pm
@@ -484,6 +484,7 @@ sub GenerateFiles
 		USE_NAMED_POSIX_SEMAPHORES => undef,
 		USE_OPENSSL                => undef,
 		USE_OPENSSL_RANDOM         => undef,
+		USE_NSS                    => undef,
 		USE_PAM                    => undef,
 		USE_SLICING_BY_8_CRC32C    => undef,
 		USE_SSE42_CRC32C           => undef,
@@ -537,6 +538,10 @@ sub GenerateFiles
 			$define{HAVE_OPENSSL_INIT_SSL}      = 1;
 		}
 	}
+	if ($self->{options}->{nss})
+	{
+		$define{USE_NSS} = 1;
+	}
 
 	$self->GenerateConfigHeader('src/include/pg_config.h',     \%define, 1);
 	$self->GenerateConfigHeader('src/include/pg_config_ext.h', \%define, 0);
@@ -1004,6 +1009,21 @@ sub AddProject
 			}
 		}
 	}
+	if ($self->{options}->{nss})
+	{
+		$proj->AddIncludeDir($self->{options}->{nss} . '\..\public\nss');
+		$proj->AddIncludeDir($self->{options}->{nss} . '\include\nspr');
+		foreach my $lib (qw(plds4 plc4 nspr4))
+		{
+			$proj->AddLibrary($self->{options}->{nss} .
+							  '\lib\lib' . "$lib.lib", 0);
+		}
+		foreach my $lib (qw(ssl3 smime3 nss3))
+		{
+			$proj->AddLibrary($self->{options}->{nss} .
+							  '\lib' . "\\$lib.dll.lib", 0);
+		}
+	}
 	if ($self->{options}->{nls})
 	{
 		$proj->AddIncludeDir($self->{options}->{nls} . '\include');
diff --git a/src/tools/msvc/config_default.pl b/src/tools/msvc/config_default.pl
index 2ef2cfc4e9..49dc4d5864 100644
--- a/src/tools/msvc/config_default.pl
+++ b/src/tools/msvc/config_default.pl
@@ -17,6 +17,7 @@ our $config = {
 	perl      => undef,    # --with-perl=<path>
 	python    => undef,    # --with-python=<path>
 	openssl   => undef,    # --with-openssl=<path>
+	nss       => undef,    # --with-nss=<path>
 	uuid      => undef,    # --with-uuid=<path>
 	xml       => undef,    # --with-libxml=<path>
 	xslt      => undef,    # --with-libxslt=<path>
-- 
2.21.1 (Apple Git-122.3)

From 0cb0e6a0ce9adb18bc9d212bd03e4e09fa452972 Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Thu, 8 Oct 2020 18:44:28 +0200
Subject: [PATCH] Support for NSS as a TLS backend v12

Daniel Gustafsson, Andrew Dunstan
---
 configure                                     |  223 +++-
 configure.ac                                  |   39 +-
 contrib/Makefile                              |    2 +-
 contrib/pgcrypto/Makefile                     |    5 +
 contrib/pgcrypto/nss.c                        |  773 +++++++++++
 contrib/pgcrypto/openssl.c                    |    2 +-
 contrib/pgcrypto/px.c                         |    1 +
 contrib/pgcrypto/px.h                         |    1 +
 .../postgres_fdw/expected/postgres_fdw.out    |    2 +-
 contrib/sslinfo/sslinfo.c                     |  164 ++-
 doc/src/sgml/acronyms.sgml                    |   43 +
 doc/src/sgml/config.sgml                      |   28 +-
 doc/src/sgml/installation.sgml                |   30 +-
 doc/src/sgml/libpq.sgml                       |   27 +-
 doc/src/sgml/pgcrypto.sgml                    |   38 +-
 doc/src/sgml/runtime.sgml                     |   78 +-
 doc/src/sgml/sslinfo.sgml                     |   14 +-
 src/Makefile.global.in                        |   10 +
 src/backend/libpq/Makefile                    |    4 +
 src/backend/libpq/auth.c                      |    7 +
 src/backend/libpq/be-secure-nss.c             | 1158 +++++++++++++++++
 src/backend/libpq/be-secure-openssl.c         |   16 +-
 src/backend/libpq/be-secure.c                 |    3 +
 src/backend/utils/misc/guc.c                  |   20 +-
 src/include/common/pg_nss.h                   |  141 ++
 src/include/libpq/libpq-be.h                  |   13 +-
 src/include/libpq/libpq.h                     |    3 +
 src/include/pg_config.h.in                    |    6 +
 src/include/pg_config_manual.h                |    5 +-
 src/interfaces/libpq/Makefile                 |    4 +
 src/interfaces/libpq/fe-connect.c             |    4 +
 src/interfaces/libpq/fe-secure-nss.c          |  984 ++++++++++++++
 src/interfaces/libpq/fe-secure.c              |    5 +-
 src/interfaces/libpq/libpq-fe.h               |   11 +
 src/interfaces/libpq/libpq-int.h              |    5 +
 src/port/pg_strong_random.c                   |   37 +
 src/test/Makefile                             |    2 +-
 src/test/ssl/Makefile                         |  176 +++
 src/test/ssl/t/001_ssltests.pl                |  326 +++--
 src/test/ssl/t/002_scram.pl                   |    4 +-
 src/test/ssl/t/SSL/Backend/NSS.pm             |   64 +
 src/test/ssl/t/SSL/Backend/OpenSSL.pm         |  103 ++
 .../ssl/t/{SSLServer.pm => SSL/Server.pm}     |   80 +-
 src/tools/msvc/Install.pm                     |    3 +-
 src/tools/msvc/Mkvcbuild.pm                   |   29 +-
 src/tools/msvc/Solution.pm                    |   20 +
 src/tools/msvc/config_default.pl              |    1 +
 47 files changed, 4430 insertions(+), 284 deletions(-)
 create mode 100644 contrib/pgcrypto/nss.c
 create mode 100644 src/backend/libpq/be-secure-nss.c
 create mode 100644 src/include/common/pg_nss.h
 create mode 100644 src/interfaces/libpq/fe-secure-nss.c
 create mode 100644 src/test/ssl/t/SSL/Backend/NSS.pm
 create mode 100644 src/test/ssl/t/SSL/Backend/OpenSSL.pm
 rename src/test/ssl/t/{SSLServer.pm => SSL/Server.pm} (78%)

diff --git a/configure b/configure
index 071d050ef0..e166c4cca6 100755
--- a/configure
+++ b/configure
@@ -711,6 +711,7 @@ with_uuid
 with_readline
 with_systemd
 with_selinux
+with_nss
 with_openssl
 with_ldap
 with_krb_srvnam
@@ -857,6 +858,7 @@ with_bsd_auth
 with_ldap
 with_bonjour
 with_openssl
+with_nss
 with_selinux
 with_systemd
 with_readline
@@ -1559,6 +1561,7 @@ Optional Packages:
   --with-ldap             build with LDAP support
   --with-bonjour          build with Bonjour support
   --with-openssl          build with OpenSSL support
+  --with-nss              build with NSS support
   --with-selinux          build with SELinux support
   --with-systemd          build with systemd support
   --without-readline      do not use GNU Readline nor BSD Libedit for editing
@@ -8106,6 +8109,41 @@ fi
 $as_echo "$with_openssl" >&6; }
 
 
+#
+# LibNSS
+#
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether to build with NSS support" >&5
+$as_echo_n "checking whether to build with NSS support... " >&6; }
+
+
+
+# Check whether --with-nss was given.
+if test "${with_nss+set}" = set; then :
+  withval=$with_nss;
+  case $withval in
+    yes)
+
+$as_echo "#define USE_NSS 1" >>confdefs.h
+
+      ;;
+    no)
+      :
+      ;;
+    *)
+      as_fn_error $? "no argument expected for --with-nss option" "$LINENO" 5
+      ;;
+  esac
+
+else
+  with_nss=no
+
+fi
+
+
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $with_nss" >&5
+$as_echo "$with_nss" >&6; }
+
+
 #
 # SELinux
 #
@@ -12180,6 +12218,9 @@ fi
 fi
 
 if test "$with_openssl" = yes ; then
+  if test x"$with_nss" = x"yes" ; then
+    as_fn_error $? "multiple SSL backends cannot be enabled simultaneously\"" "$LINENO" 5
+  fi
     # Minimum required OpenSSL version is 1.0.1
 
 $as_echo "#define OPENSSL_API_COMPAT 0x10001000L" >>confdefs.h
@@ -12442,6 +12483,157 @@ done
 
 fi
 
+if test "$with_nss" = yes ; then
+  if test x"$with_openssl" = x"yes" ; then
+    as_fn_error $? "multiple SSL backends cannot be enabled simultaneously\"" "$LINENO" 5
+  fi
+  CLEANLDFLAGS="$LDFLAGS"
+  # TODO: document this set of LDFLAGS
+  LDFLAGS="-lssl3 -lsmime3 -lnss3 -lplds4 -lplc4 -lnspr4 $LDFLAGS"
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for SSL_VersionRangeSet in -lnss3" >&5
+$as_echo_n "checking for SSL_VersionRangeSet in -lnss3... " >&6; }
+if ${ac_cv_lib_nss3_SSL_VersionRangeSet+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lnss3  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char SSL_VersionRangeSet ();
+int
+main ()
+{
+return SSL_VersionRangeSet ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_lib_nss3_SSL_VersionRangeSet=yes
+else
+  ac_cv_lib_nss3_SSL_VersionRangeSet=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_nss3_SSL_VersionRangeSet" >&5
+$as_echo "$ac_cv_lib_nss3_SSL_VersionRangeSet" >&6; }
+if test "x$ac_cv_lib_nss3_SSL_VersionRangeSet" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_LIBNSS3 1
+_ACEOF
+
+  LIBS="-lnss3 $LIBS"
+
+else
+  as_fn_error $? "library 'nss3' is required for NSS" "$LINENO" 5
+fi
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for PR_GetDefaultIOMethods in -lnspr4" >&5
+$as_echo_n "checking for PR_GetDefaultIOMethods in -lnspr4... " >&6; }
+if ${ac_cv_lib_nspr4_PR_GetDefaultIOMethods+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lnspr4  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char PR_GetDefaultIOMethods ();
+int
+main ()
+{
+return PR_GetDefaultIOMethods ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_lib_nspr4_PR_GetDefaultIOMethods=yes
+else
+  ac_cv_lib_nspr4_PR_GetDefaultIOMethods=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_nspr4_PR_GetDefaultIOMethods" >&5
+$as_echo "$ac_cv_lib_nspr4_PR_GetDefaultIOMethods" >&6; }
+if test "x$ac_cv_lib_nspr4_PR_GetDefaultIOMethods" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_LIBNSPR4 1
+_ACEOF
+
+  LIBS="-lnspr4 $LIBS"
+
+else
+  as_fn_error $? "library 'nspr4' is required for NSS" "$LINENO" 5
+fi
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for SSL_GetImplementedCiphers in -lssl3" >&5
+$as_echo_n "checking for SSL_GetImplementedCiphers in -lssl3... " >&6; }
+if ${ac_cv_lib_ssl3_SSL_GetImplementedCiphers+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lssl3  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char SSL_GetImplementedCiphers ();
+int
+main ()
+{
+return SSL_GetImplementedCiphers ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_lib_ssl3_SSL_GetImplementedCiphers=yes
+else
+  ac_cv_lib_ssl3_SSL_GetImplementedCiphers=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_ssl3_SSL_GetImplementedCiphers" >&5
+$as_echo "$ac_cv_lib_ssl3_SSL_GetImplementedCiphers" >&6; }
+if test "x$ac_cv_lib_ssl3_SSL_GetImplementedCiphers" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_LIBSSL3 1
+_ACEOF
+
+  LIBS="-lssl3 $LIBS"
+
+else
+  as_fn_error $? "library 'ssl3' is required for NSS" "$LINENO" 5
+fi
+
+  LDFLAGS="$CLEANLDFLAGS"
+fi
+
 if test "$with_pam" = yes ; then
   { $as_echo "$as_me:${as_lineno-$LINENO}: checking for pam_start in -lpam" >&5
 $as_echo_n "checking for pam_start in -lpam... " >&6; }
@@ -13344,6 +13536,25 @@ else
 fi
 
 
+fi
+
+if test "$with_nss" = yes ; then
+  ac_fn_c_check_header_mongrel "$LINENO" "ssl.h" "ac_cv_header_ssl_h" "$ac_includes_default"
+if test "x$ac_cv_header_ssl_h" = xyes; then :
+
+else
+  as_fn_error $? "header file <ssl.h> is required for NSS" "$LINENO" 5
+fi
+
+
+  ac_fn_c_check_header_mongrel "$LINENO" "nss.h" "ac_cv_header_nss_h" "$ac_includes_default"
+if test "x$ac_cv_header_nss_h" = xyes; then :
+
+else
+  as_fn_error $? "header file <nss.h> is required for NSS" "$LINENO" 5
+fi
+
+
 fi
 
 if test "$with_pam" = yes ; then
@@ -18061,11 +18272,13 @@ fi
 # in the template or configure command line.
 
 # If not selected manually, try to select a source automatically.
-if test x"$USE_OPENSSL_RANDOM" = x"" && test x"$USE_WIN32_RANDOM" = x"" && test x"$USE_DEV_URANDOM" = x"" ; then
+if test x"$USE_OPENSSL_RANDOM" = x"" && test x"$USE_WIN32_RANDOM" = x"" && test x"$USE_DEV_URANDOM" = x"" && test x"$USE_NSS_RANDOM" = x"" ; then
   if test x"$with_openssl" = x"yes" ; then
     USE_OPENSSL_RANDOM=1
   elif test "$PORTNAME" = "win32" ; then
     USE_WIN32_RANDOM=1
+  elif test x"$with_nss" = x"yes" ; then
+    USE_NSS_RANDOM=1
   else
     { $as_echo "$as_me:${as_lineno-$LINENO}: checking for /dev/urandom" >&5
 $as_echo_n "checking for /dev/urandom... " >&6; }
@@ -18107,6 +18320,12 @@ $as_echo "#define USE_WIN32_RANDOM 1" >>confdefs.h
 
   { $as_echo "$as_me:${as_lineno-$LINENO}: result: Windows native" >&5
 $as_echo "Windows native" >&6; }
+elif test x"$USE_NSS_RANDOM" = x"1" ; then
+
+$as_echo "#define USE_NSS_RANDOM 1" >>confdefs.h
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: NSS" >&5
+$as_echo "NSS" >&6; }
 elif test x"$USE_DEV_URANDOM" = x"1" ; then
 
 $as_echo "#define USE_DEV_URANDOM 1" >>confdefs.h
@@ -18116,7 +18335,7 @@ $as_echo "/dev/urandom" >&6; }
 else
   as_fn_error $? "
 no source of strong random numbers was found
-PostgreSQL can use OpenSSL or /dev/urandom as a source of random numbers." "$LINENO" 5
+PostgreSQL can use OpenSSL, NSS, Windows native RNG or /dev/urandom as a source of random numbers." "$LINENO" 5
 fi
 
 # If not set in template file, set bytes to use libc memset()
diff --git a/configure.ac b/configure.ac
index e9ce611d23..255513a006 100644
--- a/configure.ac
+++ b/configure.ac
@@ -861,6 +861,15 @@ PGAC_ARG_BOOL(with, openssl, no, [build with OpenSSL support],
 AC_MSG_RESULT([$with_openssl])
 AC_SUBST(with_openssl)
 
+#
+# LibNSS
+#
+AC_MSG_CHECKING([whether to build with NSS support])
+PGAC_ARG_BOOL(with, nss, no, [build with NSS support],
+              [AC_DEFINE([USE_NSS], 1, [Define to build with NSS support. (--with-nss)])])
+AC_MSG_RESULT([$with_nss])
+AC_SUBST(with_nss)
+
 #
 # SELinux
 #
@@ -1210,6 +1219,9 @@ if test "$with_gssapi" = yes ; then
 fi
 
 if test "$with_openssl" = yes ; then
+  if test x"$with_nss" = x"yes" ; then
+    AC_MSG_ERROR([multiple SSL backends cannot be enabled simultaneously"])
+  fi
   dnl Order matters!
   # Minimum required OpenSSL version is 1.0.1
   AC_DEFINE(OPENSSL_API_COMPAT, [0x10001000L],
@@ -1235,6 +1247,19 @@ if test "$with_openssl" = yes ; then
   AC_CHECK_FUNCS([CRYPTO_lock])
 fi
 
+if test "$with_nss" = yes ; then
+  if test x"$with_openssl" = x"yes" ; then
+    AC_MSG_ERROR([multiple SSL backends cannot be enabled simultaneously"])
+  fi
+  CLEANLDFLAGS="$LDFLAGS"
+  # TODO: document this set of LDFLAGS
+  LDFLAGS="-lssl3 -lsmime3 -lnss3 -lplds4 -lplc4 -lnspr4 $LDFLAGS"
+  AC_CHECK_LIB(nss3, SSL_VersionRangeSet, [], [AC_MSG_ERROR([library 'nss3' is required for NSS])])
+  AC_CHECK_LIB(nspr4, PR_GetDefaultIOMethods, [], [AC_MSG_ERROR([library 'nspr4' is required for NSS])])
+  AC_CHECK_LIB(ssl3, SSL_GetImplementedCiphers, [], [AC_MSG_ERROR([library 'ssl3' is required for NSS])])
+  LDFLAGS="$CLEANLDFLAGS"
+fi
+
 if test "$with_pam" = yes ; then
   AC_CHECK_LIB(pam,    pam_start, [], [AC_MSG_ERROR([library 'pam' is required for PAM])])
 fi
@@ -1410,6 +1435,11 @@ if test "$with_openssl" = yes ; then
   AC_CHECK_HEADER(openssl/err.h, [], [AC_MSG_ERROR([header file <openssl/err.h> is required for OpenSSL])])
 fi
 
+if test "$with_nss" = yes ; then
+  AC_CHECK_HEADER(ssl.h, [], [AC_MSG_ERROR([header file <ssl.h> is required for NSS])])
+  AC_CHECK_HEADER(nss.h, [], [AC_MSG_ERROR([header file <nss.h> is required for NSS])])
+fi
+
 if test "$with_pam" = yes ; then
   AC_CHECK_HEADERS(security/pam_appl.h, [],
                    [AC_CHECK_HEADERS(pam/pam_appl.h, [],
@@ -2158,11 +2188,13 @@ fi
 # in the template or configure command line.
 
 # If not selected manually, try to select a source automatically.
-if test x"$USE_OPENSSL_RANDOM" = x"" && test x"$USE_WIN32_RANDOM" = x"" && test x"$USE_DEV_URANDOM" = x"" ; then
+if test x"$USE_OPENSSL_RANDOM" = x"" && test x"$USE_WIN32_RANDOM" = x"" && test x"$USE_DEV_URANDOM" = x"" && test x"$USE_NSS_RANDOM" = x"" ; then
   if test x"$with_openssl" = x"yes" ; then
     USE_OPENSSL_RANDOM=1
   elif test "$PORTNAME" = "win32" ; then
     USE_WIN32_RANDOM=1
+  elif test x"$with_nss" = x"yes" ; then
+    USE_NSS_RANDOM=1
   else
     AC_CHECK_FILE([/dev/urandom], [], [])
 
@@ -2179,13 +2211,16 @@ if test x"$USE_OPENSSL_RANDOM" = x"1" ; then
 elif test x"$USE_WIN32_RANDOM" = x"1" ; then
   AC_DEFINE(USE_WIN32_RANDOM, 1, [Define to use native Windows API for random number generation])
   AC_MSG_RESULT([Windows native])
+elif test x"$USE_NSS_RANDOM" = x"1" ; then
+  AC_DEFINE(USE_NSS_RANDOM, 1, [Define to use NSS for random number generation])
+  AC_MSG_RESULT([NSS])
 elif test x"$USE_DEV_URANDOM" = x"1" ; then
   AC_DEFINE(USE_DEV_URANDOM, 1, [Define to use /dev/urandom for random number generation])
   AC_MSG_RESULT([/dev/urandom])
 else
   AC_MSG_ERROR([
 no source of strong random numbers was found
-PostgreSQL can use OpenSSL or /dev/urandom as a source of random numbers.])
+PostgreSQL can use OpenSSL, NSS, Windows native RNG or /dev/urandom as a source of random numbers.])
 fi
 
 # If not set in template file, set bytes to use libc memset()
diff --git a/contrib/Makefile b/contrib/Makefile
index 7a4866e338..d0b01cb2cc 100644
--- a/contrib/Makefile
+++ b/contrib/Makefile
@@ -52,7 +52,7 @@ SUBDIRS = \
 		unaccent	\
 		vacuumlo
 
-ifeq ($(with_openssl),yes)
+ifeq ($(with_ssl),yes)
 SUBDIRS += sslinfo
 else
 ALWAYS_SUBDIRS += sslinfo
diff --git a/contrib/pgcrypto/Makefile b/contrib/pgcrypto/Makefile
index 61eabd2fc0..6c69ee5a6b 100644
--- a/contrib/pgcrypto/Makefile
+++ b/contrib/pgcrypto/Makefile
@@ -7,11 +7,16 @@ INT_TESTS = sha2
 OSSL_SRCS = openssl.c pgp-mpi-openssl.c
 OSSL_TESTS = sha2 des 3des cast5
 
+NSS_SRCS = nss.c pgp-mpi-internal.c imath.c blf.c
+NSS_TESTS = sha2 des 3des
+
 ZLIB_TST = pgp-compression
 ZLIB_OFF_TST = pgp-zlib-DISABLED
 
 CF_SRCS = $(if $(subst no,,$(with_openssl)), $(OSSL_SRCS), $(INT_SRCS))
+CF_SRCS = $(if $(subst no,,$(with_nss)), $(NSS_SRCS), $(INT_SRCS))
 CF_TESTS = $(if $(subst no,,$(with_openssl)), $(OSSL_TESTS), $(INT_TESTS))
+CF_TESTS = $(if $(subst no,,$(with_nss)), $(NSS_TESTS), $(INT_TESTS))
 CF_PGP_TESTS = $(if $(subst no,,$(with_zlib)), $(ZLIB_TST), $(ZLIB_OFF_TST))
 
 SRCS = \
diff --git a/contrib/pgcrypto/nss.c b/contrib/pgcrypto/nss.c
new file mode 100644
index 0000000000..e0885cd221
--- /dev/null
+++ b/contrib/pgcrypto/nss.c
@@ -0,0 +1,773 @@
+/*-------------------------------------------------------------------------
+ *
+ * nss.c
+ *	  Wrapper for using NSS as a backend for pgcrypto PX
+ *
+ *
+ * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ *	  contrib/pgcrypto/nss.c
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#include "postgres.h"
+
+#include "px.h"
+#include "blf.h"
+#include "utils/memutils.h"
+
+/*
+ * BITS_PER_BYTE is also defined in the NSPR header files, so we need to undef
+ * our version to avoid compiler warnings on redefinition.
+ */
+#define pg_BITS_PER_BYTE BITS_PER_BYTE
+#undef BITS_PER_BYTE
+
+#include <nss.h>
+#include <hasht.h>
+#include <pk11func.h>
+#include <pk11pub.h>
+#include <secitem.h>
+#include <sechash.h>
+#include <secoid.h>
+#include <secerr.h>
+
+/*
+ * Ensure that the colliding definitions match, else throw an error. In case
+ * NSPR has removed the definition for some reason, make sure to put ours
+ * back again.
+ */
+#if defined(BITS_PER_BYTE)
+#if BITS_PER_BYTE != pg_BITS_PER_BYTE
+#error "incompatible byte widths between NSPR and postgres"
+#endif
+#else
+#define BITS_PER_BYTE pg_BITS_PER_BYTE
+#endif
+#undef pg_BITS_PER_BYTE
+
+/*
+ * Define our own mechanisms for Blowfish as it's not implemented by NSS.
+ */
+#define BLOWFISH_CBC	(1)
+#define BLOWFISH_ECB	(2)
+
+/*
+ * Data structures for recording cipher implementations as well as ongoing
+ * cipher operations.
+ */
+typedef struct nss_digest
+{
+	NSSInitContext *context;
+	PK11Context *hash_context;
+	HASH_HashType hash_type;
+}			nss_digest;
+
+typedef struct cipher_implementation
+{
+	/* Function pointers to cipher operations */
+	int			(*init) (PX_Cipher *pxc, const uint8 *key, unsigned klen, const uint8 *iv);
+	unsigned	(*get_block_size) (PX_Cipher *pxc);
+	unsigned 	(*get_key_size) (PX_Cipher *pxc);
+	unsigned 	(*get_iv_size) (PX_Cipher *pxc);
+	int			(*encrypt) (PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res);
+	int			(*decrypt) (PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res);
+	void		(*free) (PX_Cipher *pxc);
+
+	/* The mechanism describing the cipher used */
+	union
+	{
+		CK_MECHANISM_TYPE nss;
+		CK_ULONG internal;
+	}			mechanism;
+	int			keylen;
+	bool		is_nss;
+}			cipher_implementation;
+
+typedef struct nss_cipher
+{
+	const cipher_implementation *impl;
+	NSSInitContext *context;
+	PK11Context *crypt_context;
+	SECItem *params;
+
+	PK11SymKey *encrypt_key;
+	PK11SymKey *decrypt_key;
+}			nss_cipher;
+
+typedef struct internal_cipher
+{
+	const cipher_implementation *impl;
+	BlowfishContext	context;
+}			internal_cipher;
+
+typedef struct nss_cipher_ref
+{
+	const char *name;
+	const cipher_implementation *impl;
+} nss_cipher_ref;
+
+/*
+ * Prototypes
+ */
+static unsigned nss_get_iv_size(PX_Cipher *pxc);
+static unsigned nss_get_block_size(PX_Cipher *pxc);
+
+/*
+ * nss_GetHashOidTagByHashType
+ *
+ * Returns the corresponding SECOidTag for the passed hash type. NSS 3.43
+ * includes HASH_GetHashOidTagByHashType for this purpose, but at the time of
+ * writing is not commonly available so we need our own version till then.
+ */
+static SECOidTag
+nss_GetHashOidTagByHashType(HASH_HashType type)
+{
+	if (type == HASH_AlgMD2)
+		return SEC_OID_MD2;
+	if (type == HASH_AlgMD5)
+		return SEC_OID_MD5;
+	if (type == HASH_AlgSHA1)
+		return SEC_OID_SHA1;
+	if (type == HASH_AlgSHA224)
+		return SEC_OID_SHA224;
+	if (type == HASH_AlgSHA256)
+		return SEC_OID_SHA256;
+	if (type == HASH_AlgSHA384)
+		return SEC_OID_SHA384;
+	if (type == HASH_AlgSHA512)
+		return SEC_OID_SHA512;
+
+	return SEC_OID_UNKNOWN;
+}
+
+static unsigned
+nss_digest_block_size(PX_MD *pxmd)
+{
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+	const SECHashObject *object;
+
+	object = HASH_GetHashObject(digest->hash_type);
+	return object->blocklength;
+}
+
+static unsigned
+nss_digest_result_size(PX_MD *pxmd)
+{
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+	const SECHashObject *object;
+
+	object = HASH_GetHashObject(digest->hash_type);
+	return object->length;
+}
+
+static void
+nss_digest_free(PX_MD *pxmd)
+{
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+	PRBool	free_ctx = PR_TRUE;
+
+	PK11_DestroyContext(digest->hash_context, free_ctx);
+	NSS_ShutdownContext(digest->context);
+}
+
+static void
+nss_digest_update(PX_MD *pxmd, const uint8 *data, unsigned dlen)
+{
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+
+	PK11_DigestOp(digest->hash_context, data, dlen);
+}
+
+static void
+nss_digest_reset(PX_MD *pxmd)
+{
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+
+	PK11_DigestBegin(digest->hash_context);
+}
+
+static void
+nss_digest_finish(PX_MD *pxmd, uint8 *dst)
+{
+	unsigned int outlen;
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+	const SECHashObject *object;
+
+	object = HASH_GetHashObject(digest->hash_type);
+	PK11_DigestFinal(digest->hash_context, dst, &outlen, object->length);
+}
+
+int
+px_find_digest(const char *name, PX_MD **res)
+{
+	PX_MD	*pxmd;
+	NSSInitParameters params;
+	NSSInitContext *nss_context;
+	bool found = false;
+	nss_digest *digest;
+	SECStatus status;
+	SECOidData *hash;
+	HASH_HashType t;
+
+	/*
+	 * Initialize our own NSS context without a database backing it.
+	 */
+	memset(&params, 0, sizeof(params));
+	params.length = sizeof(params);
+	nss_context = NSS_InitContext("", "", "", "", &params,
+								  NSS_INIT_READONLY | NSS_INIT_NOCERTDB |
+								  NSS_INIT_NOMODDB | NSS_INIT_FORCEOPEN |
+								  NSS_INIT_NOROOTINIT | NSS_INIT_PK11RELOAD);
+
+	/*
+	 * There is no API function for looking up a digest algorithm from a name
+	 * string, but there is a publically accessible array which can be scanned
+	 * for the name.
+	 */
+	for (t = HASH_AlgNULL + 1; t < HASH_AlgTOTAL; t++)
+	{
+		SECOidTag 	hash_oid;
+		char *p;
+
+		hash_oid = nss_GetHashOidTagByHashType(t);
+
+		if (hash_oid == SEC_OID_UNKNOWN)
+			return PXE_NO_HASH;
+
+		hash = SECOID_FindOIDByTag(hash_oid);
+		if (pg_strcasecmp(hash->desc, name) == 0)
+		{
+			found = true;
+			break;
+		}
+
+		/*
+		 * NSS saves the algorithm names using SHA-xxx notation whereas
+		 * OpenSSL use SHAxxx. To make sure the user finds the requested
+		 * algorithm let's remove the dash and compare that spelling as well.
+		 */
+		if ((p = strchr(hash->desc, '-')) != NULL)
+		{
+			char tmp[12];
+
+			memcpy(tmp, hash->desc, p - hash->desc);
+			memcpy(tmp + (p - hash->desc), p + 1, strlen(hash->desc) - (p - hash->desc) + 1);
+			if (pg_strcasecmp(tmp, name) == 0)
+			{
+				found = true;
+				break;
+			}
+		}
+	}
+
+	if (!found)
+		return PXE_NO_HASH;
+
+	digest = palloc(sizeof(*digest));
+
+	digest->context = nss_context;
+	digest->hash_context = PK11_CreateDigestContext(hash->offset);
+	digest->hash_type = t;
+	if (digest->hash_context == NULL)
+	{
+		pfree(digest);
+		return -1;
+	}
+
+	status = PK11_DigestBegin(digest->hash_context);
+	if (status != SECSuccess)
+	{
+		PK11_DestroyContext(digest->hash_context, PR_TRUE);
+		pfree(digest);
+		return -1;
+	}
+
+	pxmd = palloc(sizeof(*pxmd));
+	pxmd->result_size = nss_digest_result_size;
+	pxmd->block_size = nss_digest_block_size;
+	pxmd->reset = nss_digest_reset;
+	pxmd->update = nss_digest_update;
+	pxmd->finish = nss_digest_finish;
+	pxmd->free = nss_digest_free;
+	pxmd->p.ptr = (void *) digest;
+
+	*res = pxmd;
+
+	return 0;
+}
+
+static int
+bf_init(PX_Cipher *pxc, const uint8 *key, unsigned klen, const uint8 *iv)
+{
+	internal_cipher *cipher = (internal_cipher *) pxc->ptr;
+
+	blowfish_setkey(&cipher->context, key, klen);
+	if (iv)
+		blowfish_setiv(&cipher->context, iv);
+
+	return 0;
+}
+
+static int
+bf_encrypt(PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res)
+{
+	internal_cipher *cipher = (internal_cipher *) pxc->ptr;
+	uint8 *buf;
+
+	if (dlen == 0)
+		return 0;
+
+	if (dlen & 7)
+		return PXE_NOTBLOCKSIZE;
+
+	buf = palloc(dlen);
+	memcpy(buf, data, dlen);
+
+	if (cipher->impl->mechanism.internal == BLOWFISH_ECB)
+		blowfish_encrypt_ecb(buf, dlen, &cipher->context);
+	else
+		blowfish_encrypt_cbc(buf, dlen, &cipher->context);
+
+	memcpy(res, buf, dlen);
+	pfree(buf);
+
+	return 0;
+}
+
+static int
+bf_decrypt(PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res)
+{
+	internal_cipher *cipher = (internal_cipher *) pxc->ptr;
+
+	if (dlen == 0)
+		return 0;
+
+	if (dlen & 7)
+		return PXE_NOTBLOCKSIZE;
+
+	memcpy(res, data, dlen);
+	if (cipher->impl->mechanism.internal == BLOWFISH_ECB)
+		blowfish_decrypt_ecb(res, dlen, &cipher->context);
+	else
+		blowfish_decrypt_cbc(res, dlen, &cipher->context);
+
+	return 0;
+}
+
+static void
+bf_free(PX_Cipher *pxc)
+{
+	internal_cipher *cipher = (internal_cipher *) pxc->ptr;
+
+	pfree(cipher);
+	pfree(pxc);
+}
+
+static int
+nss_symkey_blockcipher_init(PX_Cipher *pxc, const uint8 *key, unsigned klen,
+							const uint8 *iv)
+{
+	nss_cipher	   *cipher = (nss_cipher *) pxc->ptr;
+	SECItem			iv_item;
+	unsigned char  *iv_item_data;
+	SECItem			key_item;
+	int				keylen;
+	PK11SlotInfo   *slot;
+
+	if (cipher->impl->mechanism.nss == CKM_AES_CBC ||
+		cipher->impl->mechanism.nss == CKM_AES_ECB)
+	{
+		if (klen <= 128 / 8)
+			keylen = 128 / 8;
+		else if (klen <= 192 / 8)
+			keylen = 192 / 8;
+		else if (klen <= 256 / 8)
+			keylen = 256 / 8;
+		else
+			return PXE_CIPHER_INIT;
+	}
+	else
+		keylen = cipher->impl->keylen;
+
+	key_item.type = siBuffer;
+	key_item.data = (unsigned char *) key;
+	key_item.len = keylen;
+
+	/*
+	 * If hardware acceleration is configured in NSS one can theoretically get
+	 * a better slot by calling PK11_GetBestSlot() with the mechanism passed
+	 * to it. Unless there are complaints, using the simpler API will make
+	 * error handling easier though.
+	 */
+	slot = PK11_GetInternalSlot();
+	if (!slot)
+		return PXE_CIPHER_INIT;
+
+	/*
+	 * The key must be set up for the operation, and since we don't know at
+	 * this point whether we are asked to encrypt or decrypt we need to store
+	 * both versions.
+	 */
+	cipher->decrypt_key = PK11_ImportSymKey(slot, cipher->impl->mechanism.nss,
+											PK11_OriginUnwrap,
+											CKA_DECRYPT, &key_item,
+											NULL);
+	cipher->encrypt_key = PK11_ImportSymKey(slot, cipher->impl->mechanism.nss,
+											PK11_OriginUnwrap,
+											CKA_ENCRYPT, &key_item,
+											NULL);
+	PK11_FreeSlot(slot);
+
+	if (!cipher->decrypt_key || !cipher->encrypt_key)
+		return PXE_CIPHER_INIT;
+
+	if (iv)
+	{
+		iv_item.type = siBuffer;
+		iv_item.data = (unsigned char *) iv;
+		iv_item.len = nss_get_iv_size(pxc);
+	}
+	else
+	{
+		/*
+		 * The documentation states that either passing .data = 0; .len = 0;
+		 * in the iv_item, or NULL as iv_item, to PK11_ParamFromIV should be
+		 * done when IV is missing. That however leads to segfaults in the
+		 * library, the workaround that works in modern  library versions is
+		 * to pass in a keysized zeroed out IV.
+		 */
+		iv_item_data = palloc0(nss_get_iv_size(pxc));
+		iv_item.type = siBuffer;
+		iv_item.data = iv_item_data;
+		iv_item.len = nss_get_iv_size(pxc);
+	}
+
+	cipher->params = PK11_ParamFromIV(cipher->impl->mechanism.nss, &iv_item);
+
+	/* If we had to make a mock IV, free it once made into a param */
+	if (!iv)
+		pfree(iv_item_data);
+
+	if (cipher->params == NULL)
+		return PXE_CIPHER_INIT;
+
+	return 0;
+}
+
+static int
+nss_decrypt(PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res)
+{
+	nss_cipher *cipher = (nss_cipher *) pxc->ptr;
+	SECStatus	status;
+	int outlen;
+
+	if (!cipher->crypt_context)
+	{
+		cipher->crypt_context =
+			PK11_CreateContextBySymKey(cipher->impl->mechanism.nss, CKA_DECRYPT,
+									   cipher->decrypt_key, cipher->params);
+	}
+
+	status = PK11_CipherOp(cipher->crypt_context, res, &outlen, dlen, data, dlen);
+	if (status != SECSuccess)
+		return PXE_DECRYPT_FAILED;
+
+	return 0;
+}
+
+static int
+nss_encrypt(PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res)
+{
+	nss_cipher *cipher = (nss_cipher *) pxc->ptr;
+	SECStatus	status;
+	int outlen;
+
+	if (!cipher->crypt_context)
+	{
+		cipher->crypt_context =
+			PK11_CreateContextBySymKey(cipher->impl->mechanism.nss, CKA_ENCRYPT,
+									   cipher->decrypt_key, cipher->params);
+	}
+
+	status = PK11_CipherOp(cipher->crypt_context, res, &outlen, dlen, data, dlen);
+
+	if (status != SECSuccess)
+		return PXE_DECRYPT_FAILED;
+
+	return 0;
+}
+
+static void
+nss_free(PX_Cipher *pxc)
+{
+	nss_cipher *cipher = pxc->ptr;
+	PRBool		free_ctx = PR_TRUE;
+
+	PK11_FreeSymKey(cipher->encrypt_key);
+	PK11_FreeSymKey(cipher->decrypt_key);
+	PK11_DestroyContext(cipher->crypt_context, free_ctx);
+	NSS_ShutdownContext(cipher->context);
+	pfree(cipher);
+
+	pfree(pxc);
+}
+
+static unsigned
+nss_get_block_size(PX_Cipher *pxc)
+{
+	nss_cipher *cipher = pxc->ptr;
+
+	return PK11_GetBlockSize(cipher->impl->mechanism.nss, NULL);
+}
+
+static unsigned
+nss_get_key_size(PX_Cipher *pxc)
+{
+	nss_cipher *cipher = pxc->ptr;
+
+	return cipher->impl->keylen;
+}
+
+static unsigned
+nss_get_iv_size(PX_Cipher *pxc)
+{
+	nss_cipher *cipher = pxc->ptr;
+
+	return PK11_GetIVLength(cipher->impl->mechanism.nss);
+}
+
+static unsigned
+bf_get_block_size(PX_Cipher *pxc)
+{
+	return 8;
+}
+
+static unsigned
+bf_get_key_size(PX_Cipher *pxc)
+{
+	return 448 / 8;
+}
+
+static unsigned
+bf_get_iv_size(PX_Cipher *pxc)
+{
+	return 8;
+}
+
+/*
+ * Cipher Implementations
+ */
+static const cipher_implementation nss_des_cbc = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_DES_CBC,
+	.keylen = 8,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_des_ecb = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_DES_ECB,
+	.keylen = 8,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_des3_cbc = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_DES3_CBC,
+	.keylen = 24,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_des3_ecb = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_DES3_ECB,
+	.keylen = 24,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_aes_cbc = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_AES_CBC,
+	.keylen = 32,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_aes_ecb = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_AES_ECB,
+	.keylen = 32,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_bf_ecb = {
+	.init = bf_init,
+	.get_block_size = bf_get_block_size,
+	.get_key_size = bf_get_key_size,
+	.get_iv_size = bf_get_iv_size,
+	.encrypt = bf_encrypt,
+	.decrypt = bf_decrypt,
+	.free = bf_free,
+	.mechanism.internal = BLOWFISH_ECB,
+	.keylen = 56,
+	.is_nss = false
+};
+
+static const cipher_implementation nss_bf_cbc = {
+	.init = bf_init,
+	.get_block_size = bf_get_block_size,
+	.get_key_size = bf_get_key_size,
+	.get_iv_size = bf_get_iv_size,
+	.encrypt = bf_encrypt,
+	.decrypt = bf_decrypt,
+	.free = bf_free,
+	.mechanism.internal = BLOWFISH_CBC,
+	.keylen = 56,
+	.is_nss = false
+};
+
+/*
+ * Lookup table for finding the implementation based on a name. CAST5 as well
+ * as BLOWFISH are defined as cipher mechanisms in NSS but error out with
+ * SEC_ERROR_INVALID_ALGORITHM. Blowfish is implemented using the internal
+ * implementation while CAST5 isn't supported at all at this time,
+ */
+static const nss_cipher_ref nss_cipher_lookup[] = {
+	{"des", &nss_des_cbc},
+	{"des-cbc", &nss_des_cbc},
+	{"des-ecb", &nss_des_ecb},
+	{"des3-cbc", &nss_des3_cbc},
+	{"3des", &nss_des3_cbc},
+	{"3des-cbc", &nss_des3_cbc},
+	{"des3-ecb", &nss_des3_ecb},
+	{"3des-ecb", &nss_des3_ecb},
+	{"aes", &nss_aes_cbc},
+	{"aes-cbc", &nss_aes_cbc},
+	{"aes-ecb", &nss_aes_ecb},
+	{"rijndael", &nss_aes_cbc},
+	{"rijndael-cbc", &nss_aes_cbc},
+	{"rijndael-ecb", &nss_aes_ecb},
+	{"blowfish", &nss_bf_cbc},
+	{"blowfish-cbc", &nss_bf_cbc},
+	{"blowfish-ecb", &nss_bf_ecb},
+	{"bf", &nss_bf_cbc},
+	{"bf-cbc", &nss_bf_cbc},
+	{"bf-ecb", &nss_bf_ecb},
+	{NULL}
+};
+
+/*
+ * px_find_cipher
+ *
+ * Search for the requested cipher and see if there is support for it, and if
+ * so return an allocated object containing the playbook for how to encrypt
+ * and decrypt using the cipher.
+ */
+int
+px_find_cipher(const char *alias, PX_Cipher **res)
+{
+	const nss_cipher_ref *cipher_ref;
+	PX_Cipher  *px_cipher;
+	NSSInitParameters params;
+	NSSInitContext *nss_context;
+	nss_cipher	*cipher;
+	internal_cipher *int_cipher;
+
+	for (cipher_ref = nss_cipher_lookup; cipher_ref->name; cipher_ref++)
+	{
+		if (strcmp(cipher_ref->name, alias) == 0)
+			break;
+	}
+
+	if (!cipher_ref->name)
+		return PXE_NO_CIPHER;
+
+	/*
+	 * Fill in the PX_Cipher to pass back to PX describing the operations to
+	 * perform in order to use the cipher.
+	 */
+	px_cipher = palloc(sizeof(*px_cipher));
+	px_cipher->block_size = cipher_ref->impl->get_block_size;
+	px_cipher->key_size = cipher_ref->impl->get_key_size;
+	px_cipher->iv_size = cipher_ref->impl->get_iv_size;
+	px_cipher->free = cipher_ref->impl->free;
+	px_cipher->init = cipher_ref->impl->init;
+	px_cipher->encrypt = cipher_ref->impl->encrypt;
+	px_cipher->decrypt = cipher_ref->impl->decrypt;
+
+	/*
+	 * Set the private data, which is different for NSS and internal ciphers
+	 */
+	if (cipher_ref->impl->is_nss)
+	{
+		/*
+		 * Initialize our own NSS context without a database backing it. At
+		 * some point we might want to allow users to use stored keys in the
+		 * database rather than passing them via SELECT encrypt(), and then
+		 * this need to be changed to open a user specified database.
+		 */
+		memset(&params, 0, sizeof(params));
+		params.length = sizeof(params);
+		nss_context = NSS_InitContext("", "", "", "", &params,
+									  NSS_INIT_READONLY | NSS_INIT_NOCERTDB |
+									  NSS_INIT_NOMODDB | NSS_INIT_FORCEOPEN |
+									  NSS_INIT_NOROOTINIT | NSS_INIT_PK11RELOAD);
+
+		/* nss_cipher is the private state struct for the operation */
+		cipher = palloc(sizeof(*cipher));
+		cipher->context = nss_context;
+		cipher->impl = cipher_ref->impl;
+		cipher->crypt_context = NULL;
+
+		px_cipher->ptr = cipher;
+	}
+	else
+	{
+		int_cipher = palloc0(sizeof(*int_cipher));
+
+		int_cipher->impl = cipher_ref->impl;
+		px_cipher->ptr = int_cipher;
+	}
+
+	*res = px_cipher;
+	return 0;
+}
diff --git a/contrib/pgcrypto/openssl.c b/contrib/pgcrypto/openssl.c
index ed96e4ce53..5ebe213406 100644
--- a/contrib/pgcrypto/openssl.c
+++ b/contrib/pgcrypto/openssl.c
@@ -400,7 +400,7 @@ gen_ossl_encrypt(PX_Cipher *c, const uint8 *data, unsigned dlen,
 	}
 
 	if (!EVP_EncryptUpdate(od->evp_ctx, res, &outlen, data, dlen))
-		return PXE_ERR_GENERIC;
+		return PXE_ENCRYPT_FAILED;
 
 	return 0;
 }
diff --git a/contrib/pgcrypto/px.c b/contrib/pgcrypto/px.c
index 6a4681dae9..a243f575d3 100644
--- a/contrib/pgcrypto/px.c
+++ b/contrib/pgcrypto/px.c
@@ -58,6 +58,7 @@ static const struct error_desc px_err_list[] = {
 	{PXE_MCRYPT_INTERNAL, "mcrypt internal error"},
 	{PXE_NO_RANDOM, "Failed to generate strong random bits"},
 	{PXE_DECRYPT_FAILED, "Decryption failed"},
+	{PXE_ENCRYPT_FAILED, "Encryption failed"},
 	{PXE_PGP_CORRUPT_DATA, "Wrong key or corrupt data"},
 	{PXE_PGP_CORRUPT_ARMOR, "Corrupt ascii-armor"},
 	{PXE_PGP_UNSUPPORTED_COMPR, "Unsupported compression algorithm"},
diff --git a/contrib/pgcrypto/px.h b/contrib/pgcrypto/px.h
index 5487923edb..17d6f22498 100644
--- a/contrib/pgcrypto/px.h
+++ b/contrib/pgcrypto/px.h
@@ -61,6 +61,7 @@
 #define PXE_MCRYPT_INTERNAL			-16
 #define PXE_NO_RANDOM				-17
 #define PXE_DECRYPT_FAILED			-18
+#define PXE_ENCRYPT_FAILED			-19
 
 #define PXE_PGP_CORRUPT_DATA		-100
 #define PXE_PGP_CORRUPT_ARMOR		-101
diff --git a/contrib/postgres_fdw/expected/postgres_fdw.out b/contrib/postgres_fdw/expected/postgres_fdw.out
index 2d88d06358..984efc0d7e 100644
--- a/contrib/postgres_fdw/expected/postgres_fdw.out
+++ b/contrib/postgres_fdw/expected/postgres_fdw.out
@@ -8911,7 +8911,7 @@ DO $d$
     END;
 $d$;
 ERROR:  invalid option "password"
-HINT:  Valid options in this context are: service, passfile, channel_binding, connect_timeout, dbname, host, hostaddr, port, options, application_name, keepalives, keepalives_idle, keepalives_interval, keepalives_count, tcp_user_timeout, sslmode, sslcompression, sslcert, sslkey, sslrootcert, sslcrl, requirepeer, ssl_min_protocol_version, ssl_max_protocol_version, gssencmode, krbsrvname, gsslib, target_session_attrs, use_remote_estimate, fdw_startup_cost, fdw_tuple_cost, extensions, updatable, fetch_size
+HINT:  Valid options in this context are: service, passfile, channel_binding, connect_timeout, dbname, host, hostaddr, port, options, application_name, keepalives, keepalives_idle, keepalives_interval, keepalives_count, tcp_user_timeout, sslmode, sslcompression, sslcert, sslkey, sslrootcert, sslcrl, requirepeer, ssl_min_protocol_version, ssl_max_protocol_version, gssencmode, krbsrvname, gsslib, target_session_attrs, cert_database, use_remote_estimate, fdw_startup_cost, fdw_tuple_cost, extensions, updatable, fetch_size
 CONTEXT:  SQL statement "ALTER SERVER loopback_nopw OPTIONS (ADD password 'dummypw')"
 PL/pgSQL function inline_code_block line 3 at EXECUTE
 -- If we add a password for our user mapping instead, we should get a different
diff --git a/contrib/sslinfo/sslinfo.c b/contrib/sslinfo/sslinfo.c
index 5ba3988e27..84bb2c65b8 100644
--- a/contrib/sslinfo/sslinfo.c
+++ b/contrib/sslinfo/sslinfo.c
@@ -9,9 +9,11 @@
 
 #include "postgres.h"
 
+#ifdef USE_OPENSSL
 #include <openssl/x509.h>
 #include <openssl/x509v3.h>
 #include <openssl/asn1.h>
+#endif
 
 #include "access/htup_details.h"
 #include "funcapi.h"
@@ -21,8 +23,8 @@
 
 PG_MODULE_MAGIC;
 
+#ifdef USE_OPENSSL
 static Datum X509_NAME_field_to_text(X509_NAME *name, text *fieldName);
-static Datum X509_NAME_to_text(X509_NAME *name);
 static Datum ASN1_STRING_to_text(ASN1_STRING *str);
 
 /*
@@ -32,6 +34,7 @@ typedef struct
 {
 	TupleDesc	tupdesc;
 } SSLExtensionInfoContext;
+#endif
 
 /*
  * Indicates whether current session uses SSL
@@ -54,9 +57,16 @@ PG_FUNCTION_INFO_V1(ssl_version);
 Datum
 ssl_version(PG_FUNCTION_ARGS)
 {
-	if (MyProcPort->ssl == NULL)
+	const char *version;
+
+	if (!MyProcPort->ssl_in_use)
+		PG_RETURN_NULL();
+
+	version = be_tls_get_version(MyProcPort);
+	if (version == NULL)
 		PG_RETURN_NULL();
-	PG_RETURN_TEXT_P(cstring_to_text(SSL_get_version(MyProcPort->ssl)));
+
+	PG_RETURN_TEXT_P(cstring_to_text(version));
 }
 
 
@@ -67,9 +77,16 @@ PG_FUNCTION_INFO_V1(ssl_cipher);
 Datum
 ssl_cipher(PG_FUNCTION_ARGS)
 {
-	if (MyProcPort->ssl == NULL)
+	const char *cipher;
+
+	if (!MyProcPort->ssl_in_use)
 		PG_RETURN_NULL();
-	PG_RETURN_TEXT_P(cstring_to_text(SSL_get_cipher(MyProcPort->ssl)));
+
+	cipher = be_tls_get_cipher(MyProcPort);
+	if (cipher == NULL)
+		PG_RETURN_NULL();
+
+	PG_RETURN_TEXT_P(cstring_to_text(cipher));
 }
 
 
@@ -83,7 +100,7 @@ PG_FUNCTION_INFO_V1(ssl_client_cert_present);
 Datum
 ssl_client_cert_present(PG_FUNCTION_ARGS)
 {
-	PG_RETURN_BOOL(MyProcPort->peer != NULL);
+	PG_RETURN_BOOL(MyProcPort->peer_cert_valid);
 }
 
 
@@ -99,29 +116,26 @@ PG_FUNCTION_INFO_V1(ssl_client_serial);
 Datum
 ssl_client_serial(PG_FUNCTION_ARGS)
 {
+	char decimal[NAMEDATALEN];
 	Datum		result;
-	Port	   *port = MyProcPort;
-	X509	   *peer = port->peer;
-	ASN1_INTEGER *serial = NULL;
-	BIGNUM	   *b;
-	char	   *decimal;
 
-	if (!peer)
+	if (!MyProcPort->ssl_in_use || !MyProcPort->peer_cert_valid)
+		PG_RETURN_NULL();
+
+	be_tls_get_peer_serial(MyProcPort, decimal, NAMEDATALEN);
+
+	if (!*decimal)
 		PG_RETURN_NULL();
-	serial = X509_get_serialNumber(peer);
-	b = ASN1_INTEGER_to_BN(serial, NULL);
-	decimal = BN_bn2dec(b);
 
-	BN_free(b);
 	result = DirectFunctionCall3(numeric_in,
 								 CStringGetDatum(decimal),
 								 ObjectIdGetDatum(0),
 								 Int32GetDatum(-1));
-	OPENSSL_free(decimal);
 	return result;
 }
 
 
+#ifdef USE_OPENSSL
 /*
  * Converts OpenSSL ASN1_STRING structure into text
  *
@@ -228,7 +242,7 @@ ssl_client_dn_field(PG_FUNCTION_ARGS)
 	text	   *fieldname = PG_GETARG_TEXT_PP(0);
 	Datum		result;
 
-	if (!(MyProcPort->peer))
+	if (!MyProcPort->ssl_in_use || !MyProcPort->peer_cert_valid)
 		PG_RETURN_NULL();
 
 	result = X509_NAME_field_to_text(X509_get_subject_name(MyProcPort->peer), fieldname);
@@ -273,76 +287,23 @@ ssl_issuer_field(PG_FUNCTION_ARGS)
 	else
 		return result;
 }
+#endif							/* USE_OPENSSL */
 
-
-/*
- * Equivalent of X509_NAME_oneline that respects encoding
- *
- * This function converts X509_NAME structure to the text variable
- * converting all textual data into current database encoding.
- *
- * Parameter: X509_NAME *name X509_NAME structure to be converted
- *
- * Returns: text datum which contains string representation of
- * X509_NAME
- */
-static Datum
-X509_NAME_to_text(X509_NAME *name)
+#ifdef USE_NSS
+PG_FUNCTION_INFO_V1(ssl_client_dn_field);
+Datum
+ssl_client_dn_field(PG_FUNCTION_ARGS)
 {
-	BIO		   *membuf = BIO_new(BIO_s_mem());
-	int			i,
-				nid,
-				count = X509_NAME_entry_count(name);
-	X509_NAME_ENTRY *e;
-	ASN1_STRING *v;
-	const char *field_name;
-	size_t		size;
-	char		nullterm;
-	char	   *sp;
-	char	   *dp;
-	text	   *result;
-
-	if (membuf == NULL)
-		ereport(ERROR,
-				(errcode(ERRCODE_OUT_OF_MEMORY),
-				 errmsg("could not create OpenSSL BIO structure")));
-
-	(void) BIO_set_close(membuf, BIO_CLOSE);
-	for (i = 0; i < count; i++)
-	{
-		e = X509_NAME_get_entry(name, i);
-		nid = OBJ_obj2nid(X509_NAME_ENTRY_get_object(e));
-		if (nid == NID_undef)
-			ereport(ERROR,
-					(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
-					 errmsg("could not get NID for ASN1_OBJECT object")));
-		v = X509_NAME_ENTRY_get_data(e);
-		field_name = OBJ_nid2sn(nid);
-		if (field_name == NULL)
-			field_name = OBJ_nid2ln(nid);
-		if (field_name == NULL)
-			ereport(ERROR,
-					(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
-					 errmsg("could not convert NID %d to an ASN1_OBJECT structure", nid)));
-		BIO_printf(membuf, "/%s=", field_name);
-		ASN1_STRING_print_ex(membuf, v,
-							 ((ASN1_STRFLGS_RFC2253 & ~ASN1_STRFLGS_ESC_MSB)
-							  | ASN1_STRFLGS_UTF8_CONVERT));
-	}
-
-	/* ensure null termination of the BIO's content */
-	nullterm = '\0';
-	BIO_write(membuf, &nullterm, 1);
-	size = BIO_get_mem_data(membuf, &sp);
-	dp = pg_any_to_server(sp, size - 1, PG_UTF8);
-	result = cstring_to_text(dp);
-	if (dp != sp)
-		pfree(dp);
-	if (BIO_free(membuf) != 1)
-		elog(ERROR, "could not free OpenSSL BIO structure");
+	PG_RETURN_NULL();
+}
 
-	PG_RETURN_TEXT_P(result);
+PG_FUNCTION_INFO_V1(ssl_issuer_field);
+Datum
+ssl_issuer_field(PG_FUNCTION_ARGS)
+{
+	PG_RETURN_NULL();
 }
+#endif							/* USE_NSS */
 
 
 /*
@@ -358,9 +319,17 @@ PG_FUNCTION_INFO_V1(ssl_client_dn);
 Datum
 ssl_client_dn(PG_FUNCTION_ARGS)
 {
-	if (!(MyProcPort->peer))
+	char		subject[NAMEDATALEN];
+
+	if (!MyProcPort->ssl_in_use || !MyProcPort->peer_cert_valid)
+		PG_RETURN_NULL();
+
+	be_tls_get_peer_subject_name(MyProcPort, subject, NAMEDATALEN);
+
+	if (!*subject)
 		PG_RETURN_NULL();
-	return X509_NAME_to_text(X509_get_subject_name(MyProcPort->peer));
+
+	PG_RETURN_TEXT_P(cstring_to_text(subject));
 }
 
 
@@ -377,12 +346,21 @@ PG_FUNCTION_INFO_V1(ssl_issuer_dn);
 Datum
 ssl_issuer_dn(PG_FUNCTION_ARGS)
 {
-	if (!(MyProcPort->peer))
+	char		issuer[NAMEDATALEN];
+
+	if (!MyProcPort->ssl_in_use || !MyProcPort->peer_cert_valid)
+		PG_RETURN_NULL();
+
+	be_tls_get_peer_issuer_name(MyProcPort, issuer, NAMEDATALEN);
+
+	if (!*issuer)
 		PG_RETURN_NULL();
-	return X509_NAME_to_text(X509_get_issuer_name(MyProcPort->peer));
+
+	PG_RETURN_TEXT_P(cstring_to_text(issuer));
 }
 
 
+#ifdef USE_OPENSSL
 /*
  * Returns information about available SSL extensions.
  *
@@ -516,3 +494,13 @@ ssl_extension_info(PG_FUNCTION_ARGS)
 	/* All done */
 	SRF_RETURN_DONE(funcctx);
 }
+#endif							/* USE_OPENSSL */
+
+#ifdef USE_NSS
+PG_FUNCTION_INFO_V1(ssl_extension_info);
+Datum
+ssl_extension_info(PG_FUNCTION_ARGS)
+{
+	PG_RETURN_NULL();
+}
+#endif							/* USE_NSS */
diff --git a/doc/src/sgml/acronyms.sgml b/doc/src/sgml/acronyms.sgml
index 4e5ec983c0..4f6f0cf353 100644
--- a/doc/src/sgml/acronyms.sgml
+++ b/doc/src/sgml/acronyms.sgml
@@ -441,6 +441,28 @@
     </listitem>
    </varlistentry>
 
+   <varlistentry>
+    <term><acronym>NSPR</acronym></term>
+    <listitem>
+     <para>
+      <ulink
+      url="https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSPR">
+      Netscape Portable Runtime</ulink>
+     </para>
+    </listitem>
+   </varlistentry>
+
+   <varlistentry>
+    <term><acronym>NSS</acronym></term>
+    <listitem>
+     <para>
+      <ulink
+      url="https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS">
+      Network Security Services</ulink>
+     </para>
+    </listitem>
+   </varlistentry>
+
    <varlistentry>
     <term><acronym>ODBC</acronym></term>
     <listitem>
@@ -539,6 +561,17 @@
     </listitem>
    </varlistentry>
 
+   <varlistentry>
+    <term><acronym>PKCS#12</acronym></term>
+    <listitem>
+     <para>
+      <ulink
+      url="https://en.wikipedia.org/wiki/PKCS_12">
+      Public-Key Cryptography Standards #12</ulink>
+     </para>
+    </listitem>
+   </varlistentry>
+
    <varlistentry>
     <term><acronym>PL</acronym></term>
     <listitem>
@@ -684,6 +717,16 @@
     </listitem>
    </varlistentry>
 
+   <varlistentry>
+    <term><acronym>TLS</acronym></term>
+    <listitem>
+     <para>
+      <ulink url="https://sv.wikipedia.org/wiki/Transport_Layer_Security">
+      Transport Layer Security</ulink>
+     </para>
+    </listitem>
+   </varlistentry>
+
    <varlistentry>
     <term><acronym>TOAST</acronym></term>
     <listitem>
diff --git a/doc/src/sgml/config.sgml b/doc/src/sgml/config.sgml
index f043433e31..f7ae3b1be1 100644
--- a/doc/src/sgml/config.sgml
+++ b/doc/src/sgml/config.sgml
@@ -1208,6 +1208,23 @@ include_dir 'conf.d'
       </listitem>
      </varlistentry>
 
+     <varlistentry id="guc-ssl-database" xreflabel="ssl_database">
+      <term><varname>ssl_database</varname> (<type>string</type>)
+      <indexterm>
+       <primary><varname>ssl_database</varname> configuration parameter</primary>
+      </indexterm>
+      </term>
+      <listitem>
+       <para>
+        Specifies the name of the file containing the server certificates and
+        keys when using <productname>NSS</productname> for <acronym>SSL</acronym>
+        connections. This parameter can only be set in the
+        <filename>postgresql.conf</filename> file or on the server command
+        line.
+       </para>
+      </listitem>
+     </varlistentry>
+
      <varlistentry id="guc-ssl-ciphers" xreflabel="ssl_ciphers">
       <term><varname>ssl_ciphers</varname> (<type>string</type>)
       <indexterm>
@@ -1224,7 +1241,9 @@ include_dir 'conf.d'
         connections using TLS version 1.2 and lower are affected.  There is
         currently no setting that controls the cipher choices used by TLS
         version 1.3 connections.  The default value is
-        <literal>HIGH:MEDIUM:+3DES:!aNULL</literal>.  The default is usually a
+        <literal>HIGH:MEDIUM:+3DES:!aNULL</literal> for servers which have
+        been built with <productname>OpenSSL</productname> as the
+        <acronym>SSL</acronym> library.  The default is usually a
         reasonable choice unless you have specific security requirements.
        </para>
 
@@ -1426,8 +1445,11 @@ include_dir 'conf.d'
        <para>
         Sets an external command to be invoked when a passphrase for
         decrypting an SSL file such as a private key needs to be obtained.  By
-        default, this parameter is empty, which means the built-in prompting
-        mechanism is used.
+        default, this parameter is empty. When the server is using
+        <productname>OpenSSL</productname>, this means the built-in prompting
+        mechanism is used. When using <productname>NSS</productname>, there is
+        no default prompting so a blank callback will be used returning an
+        empty password.
        </para>
        <para>
         The command must print the passphrase to the standard output and exit
diff --git a/doc/src/sgml/installation.sgml b/doc/src/sgml/installation.sgml
index 3ac588dfb5..c867b87900 100644
--- a/doc/src/sgml/installation.sgml
+++ b/doc/src/sgml/installation.sgml
@@ -250,7 +250,7 @@ su - postgres
 
     <listitem>
      <para>
-      You need <productname>OpenSSL</productname>, if you want to support
+      You need a supported <acronym>SSL</acronym> library, if you want to support
       encrypted client connections.  <productname>OpenSSL</productname> is
       also required for random number generation on platforms that do not
       have <filename>/dev/urandom</filename> (except Windows).  The minimum
@@ -969,6 +969,31 @@ build-postgresql:
        </listitem>
       </varlistentry>
 
+      <varlistentry>
+       <term><option>--with-nss</option>
+       <indexterm>
+        <primary>NSS</primary>
+        <secondary>NSPR</secondary>
+        <seealso>SSL</seealso>
+       </indexterm>
+       </term>
+       <listitem>
+        <para>
+         Build with support for <acronym>SSL</acronym> (encrypted)
+         connections using <productname>NSS</productname>. This requires the
+         <productname>NSS</productname> package to be installed. Additionally,
+         <productname>NSS</productname> requires <productname>NSPR</productname>
+         to be installed. <filename>configure</filename> will check for the
+         required header files and libraries to make sure that your
+         <productname>NSS</productname> installation is sufficient before
+         proceeding.
+        </para>
+        <para>
+         This option is incompatible with <literal>--with-openssl</literal>.
+        </para>
+       </listitem>
+      </varlistentry>
+
       <varlistentry>
        <term><option>--with-openssl</option>
        <indexterm>
@@ -985,6 +1010,9 @@ build-postgresql:
          your <productname>OpenSSL</productname> installation is sufficient
          before proceeding.
         </para>
+        <para>
+         This option is incompatible with <literal>--with-nss</literal>.
+        </para>
        </listitem>
       </varlistentry>
 
diff --git a/doc/src/sgml/libpq.sgml b/doc/src/sgml/libpq.sgml
index de60281fcb..c127309d76 100644
--- a/doc/src/sgml/libpq.sgml
+++ b/doc/src/sgml/libpq.sgml
@@ -2459,6 +2459,8 @@ void *PQsslStruct(const PGconn *conn, const char *struct_name);
       </para>
       <para>
        The struct(s) available depend on the SSL implementation in use.
+      </para>
+      <para>
        For <productname>OpenSSL</productname>, there is one struct,
        available under the name "OpenSSL", and it returns a pointer to the
        <productname>OpenSSL</productname> <literal>SSL</literal> struct.
@@ -2482,9 +2484,14 @@ void *PQsslStruct(const PGconn *conn, const char *struct_name);
 ]]></programlisting>
       </para>
       <para>
-       This structure can be used to verify encryption levels, check server
-       certificates, and more. Refer to the <productname>OpenSSL</productname>
-       documentation for information about this structure.
+       For <productname>NSS</productname>, there is one struct available under
+       the name "NSS", and it returns a pointer to the
+       <productname>NSS</productname> <literal>PRFileDesc</literal>.
+      </para>
+      <para>
+       These structures can be used to verify encryption levels, check server
+       certificates, and more. Refer to the <acronym>SSL</acronym> library
+       documentation for information about these structures.
       </para>
      </listitem>
     </varlistentry>
@@ -2511,6 +2518,10 @@ void *PQgetssl(const PGconn *conn);
        <xref linkend="libpq-PQsslInUse"/> instead, and for more details about the
        connection, use <xref linkend="libpq-PQsslAttribute"/>.
       </para>
+      <para>
+       This function returns <literal>NULL</literal> when <acronym>SSL</acronym>
+       librariaes other than <productname>OpenSSL</productname> are used.
+      </para>
      </listitem>
     </varlistentry>
 
@@ -7943,6 +7954,11 @@ void PQinitOpenSSL(int do_ssl, int do_crypto);
        before first opening a database connection.  Also be sure that you
        have done that initialization before opening a database connection.
       </para>
+
+      <para>
+       This function does nothing when using <productname>NSS</productname> as
+       the <acronym>SSL</acronym> library.
+      </para>
      </listitem>
     </varlistentry>
 
@@ -7969,6 +7985,11 @@ void PQinitSSL(int do_ssl);
        might be preferable for applications that need to work with older
        versions of <application>libpq</application>.
       </para>
+
+      <para>
+       This function does nothing when using <productname>NSS</productname> as
+       the <acronym>SSL</acronym> library.
+      </para>
      </listitem>
     </varlistentry>
    </variablelist>
diff --git a/doc/src/sgml/pgcrypto.sgml b/doc/src/sgml/pgcrypto.sgml
index 8748c64e2d..f03e1f5fcf 100644
--- a/doc/src/sgml/pgcrypto.sgml
+++ b/doc/src/sgml/pgcrypto.sgml
@@ -45,8 +45,9 @@ digest(data bytea, type text) returns bytea
     <literal>sha224</literal>, <literal>sha256</literal>,
     <literal>sha384</literal> and <literal>sha512</literal>.
     If <filename>pgcrypto</filename> was built with
-    <productname>OpenSSL</productname>, more algorithms are available, as
-    detailed in <xref linkend="pgcrypto-with-without-openssl"/>.
+    <productname>OpenSSL</productname> or <productname>NSS</productname>,
+    more algorithms are available, as
+    detailed in <xref linkend="pgcrypto-with-without-openssl-nss"/>.
    </para>
 
    <para>
@@ -763,7 +764,7 @@ pgp_sym_encrypt(data, psw, 'compress-algo=1, cipher-algo=aes256')
     Which cipher algorithm to use.
    </para>
 <literallayout>
-Values: bf, aes128, aes192, aes256 (OpenSSL-only: <literal>3des</literal>, <literal>cast5</literal>)
+Values: bf, aes128, aes192, aes256 (OpenSSL-only: <literal>3des</literal>, <literal>cast5</literal>; NSS-only: <literal>3des</literal>)
 Default: aes128
 Applies to: pgp_sym_encrypt, pgp_pub_encrypt
 </literallayout>
@@ -1152,8 +1153,8 @@ gen_random_uuid() returns uuid
    <para>
     <filename>pgcrypto</filename> configures itself according to the findings of the
     main PostgreSQL <literal>configure</literal> script.  The options that
-    affect it are <literal>--with-zlib</literal> and
-    <literal>--with-openssl</literal>.
+    affect it are <literal>--with-zlib</literal>,
+    <literal>--with-openssl</literal> and <literal>--with-nss</literal>.
    </para>
 
    <para>
@@ -1168,14 +1169,16 @@ gen_random_uuid() returns uuid
     BIGNUM functions.
    </para>
 
-   <table id="pgcrypto-with-without-openssl">
-    <title>Summary of Functionality with and without OpenSSL</title>
-    <tgroup cols="3">
+   <table id="pgcrypto-with-without-openssl-nss">
+    <title>Summary of Functionality with and without external cryptographic
+      library</title>
+    <tgroup cols="4">
      <thead>
       <row>
        <entry>Functionality</entry>
        <entry>Built-in</entry>
        <entry>With OpenSSL</entry>
+       <entry>With NSS</entry>
       </row>
      </thead>
      <tbody>
@@ -1183,51 +1186,67 @@ gen_random_uuid() returns uuid
        <entry>MD5</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>SHA1</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>SHA224/256/384/512</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>Other digest algorithms</entry>
        <entry>no</entry>
        <entry>yes (Note 1)</entry>
+       <entry>yes (Note 1)</entry>
       </row>
       <row>
        <entry>Blowfish</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>AES</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>DES/3DES/CAST5</entry>
        <entry>no</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
+      </row>
+      <row>
+       <entry>CAST5</entry>
+       <entry>no</entry>
+       <entry>yes</entry>
+       <entry>no</entry>
       </row>
       <row>
        <entry>Raw encryption</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>PGP Symmetric encryption</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>PGP Public-Key encryption</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
      </tbody>
     </tgroup>
@@ -1240,7 +1259,8 @@ gen_random_uuid() returns uuid
    <orderedlist>
     <listitem>
      <para>
-      Any digest algorithm <productname>OpenSSL</productname> supports
+      Any digest algorithm <productname>OpenSSL</productname> and
+      <productname>NSS</productname> supports
       is automatically picked up.
       This is not possible with ciphers, which need to be supported
       explicitly.
diff --git a/doc/src/sgml/runtime.sgml b/doc/src/sgml/runtime.sgml
index 17e938148c..fe7e305b75 100644
--- a/doc/src/sgml/runtime.sgml
+++ b/doc/src/sgml/runtime.sgml
@@ -2183,15 +2183,21 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
 
   <indexterm zone="ssl-tcp">
    <primary>SSL</primary>
+   <secondary>TLS</secondary>
   </indexterm>
 
   <para>
    <productname>PostgreSQL</productname> has native support for using
    <acronym>SSL</acronym> connections to encrypt client/server communications
    for increased security. This requires that
-   <productname>OpenSSL</productname> is installed on both client and
+   a supported TLS library is installed on both client and
    server systems and that support in <productname>PostgreSQL</productname> is
    enabled at build time (see <xref linkend="installation"/>).
+   Supported libraries are <productname>OpenSSL</productname> and
+   <productname>NSS</productname>. The terms <acronym>SSL</acronym> and
+   <acronym>TLS</acronym> are often used interchangeably to mean a secure
+   connection using a <acronym>TLS</acronym> protocol, even though
+   <acronym>SSL</acronym> protocols are no longer supported.
   </para>
 
   <sect2 id="ssl-setup">
@@ -2211,8 +2217,13 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
   </para>
 
   <para>
-   To start in <acronym>SSL</acronym> mode, files containing the server certificate
-   and private key must exist.  By default, these files are expected to be
+   To start in <acronym>SSL</acronym> mode, a server certificate
+   and private key must exist. The below sections on the different libraries
+   will discuss how to configure these.
+  </para>
+   
+  <para>
+   By default, these files are expected to be
    named <filename>server.crt</filename> and <filename>server.key</filename>, respectively, in
    the server's data directory, but other names and locations can be specified
    using the configuration parameters <xref linkend="guc-ssl-cert-file"/>
@@ -2302,6 +2313,18 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
   </note>
   </sect2>
 
+  <sect2 id="ssl-nss-config">
+   <title>NSS Configuration</title>
+
+  <para>
+   <productname>PostgreSQL</productname> will look for certificates and keys
+   in the <productname>NSS</productname> database specified by the parameter
+   <xref linkend="guc-ssl-database"/> in <filename>postgresql.conf</filename>.
+   The paramaters for certificate and key filenames are used to identify the
+   nicknames in the database.
+  </para>
+  </sect2>
+
   <sect2 id="ssl-client-certificates">
    <title>Using Client Certificates</title>
 
@@ -2376,7 +2399,7 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
   </sect2>
 
   <sect2 id="ssl-server-files">
-   <title>SSL Server File Usage</title>
+   <title>SSL Server File Parameter Usage</title>
 
    <para>
     <xref linkend="ssl-file-usage"/> summarizes the files that are
@@ -2423,6 +2446,14 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
       <entry>client certificate must not be on this list</entry>
      </row>
 
+     <row>
+      <entry><xref linkend="guc-ssl-database"/></entry>
+      <entry>certificate database</entry>
+      <entry>contains server certificates, keys and revocation lists; only
+      used when <productname>PostgreSQL</productname> is built with support
+      for <productname>NSS</productname>.</entry>
+     </row>
+
     </tbody>
    </tgroup>
   </table>
@@ -2550,6 +2581,45 @@ openssl x509 -req -in server.csr -text -days 365 \
    </para>
   </sect2>
 
+  <sect2 id="nss-certificate-database">
+   <title>NSS Certificate Databases</title>
+
+   <para>
+    When using <productname>NSS</productname>, all certificates and keys must
+    be loaded into an <productname>NSS</productname> certificate database.
+   </para>
+
+   <para>
+    To create a new <productname>NSS</productname> certificate database and
+    load the certificates created in <xref linkend="ssl-certificate-creation" />,
+    use the following <productname>NSS</productname> commands:
+<programlisting>
+certutil -d "sql:server.db" -N --empty-password
+certutil -d "sql:server.db" -A -n server.crt -i server.crt -t "CT,C,C"
+certutil -d "sql:server.db" -A -n root.crt -i root.crt -t "CT,C,C"
+</programlisting>
+    This will give the certificate the filename as the nickname identifier in
+    the database which is created as <filename>server.db</filename>.
+   </para>
+   <para>
+    Then load the server key, which require converting it to
+    <acronym>PKCS#12</acronym> format using the
+    <productname>OpenSSL</productname> tools:
+<programlisting>
+openssl pkcs12 -export -out server.pfx -inkey server.key -in server.crt \
+  -certfile root.crt -passout pass:
+pk12util -i server.pfx -d server.db -W ''
+</programlisting>
+   </para>
+   <para>
+    Finally a certificate revocation list can be loaded with the following
+    commands:
+<programlisting>
+crlutil -I -i server.crl -d server.db -B
+</programlisting>
+   </para>
+  </sect2>
+
  </sect1>
 
  <sect1 id="gssapi-enc">
diff --git a/doc/src/sgml/sslinfo.sgml b/doc/src/sgml/sslinfo.sgml
index e16f61b41d..253bb697af 100644
--- a/doc/src/sgml/sslinfo.sgml
+++ b/doc/src/sgml/sslinfo.sgml
@@ -22,7 +22,8 @@
 
  <para>
   This extension won't build at all unless the installation was
-  configured with <literal>--with-openssl</literal>.
+  configured with SSL support, such as <literal>--with-openssl</literal>
+  or <literal>--with-nss</literal>.
  </para>
 
  <sect2>
@@ -54,7 +55,7 @@
     <listitem>
     <para>
      Returns the name of the protocol used for the SSL connection (e.g., TLSv1.0
-     TLSv1.1, or TLSv1.2).
+     TLSv1.1, TLSv1.2 or TLSv1.3).
     </para>
     </listitem>
    </varlistentry>
@@ -208,6 +209,9 @@ emailAddress
      the X.500 and X.509 standards, so you cannot just assign arbitrary
      meaning to them.
     </para>
+    <para>
+     This function is only available when using <productname>OpenSSL</productname>.
+    </para>
     </listitem>
    </varlistentry>
 
@@ -223,6 +227,9 @@ emailAddress
      Same as <function>ssl_client_dn_field</function>, but for the certificate issuer
      rather than the certificate subject.
     </para>
+    <para>
+     This function is only available when using <productname>OpenSSL</productname>.
+    </para>
     </listitem>
    </varlistentry>
 
@@ -238,6 +245,9 @@ emailAddress
      Provide information about extensions of client certificate: extension name,
      extension value, and if it is a critical extension.
     </para>
+    <para>
+     This function is only available when using <productname>OpenSSL</productname>.
+    </para>
     </listitem>
    </varlistentry>
   </variablelist>
diff --git a/src/Makefile.global.in b/src/Makefile.global.in
index 7ca1e9aac5..8946fa696a 100644
--- a/src/Makefile.global.in
+++ b/src/Makefile.global.in
@@ -184,6 +184,7 @@ with_perl	= @with_perl@
 with_python	= @with_python@
 with_tcl	= @with_tcl@
 with_openssl	= @with_openssl@
+with_nss        = @with_nss@
 with_readline	= @with_readline@
 with_selinux	= @with_selinux@
 with_systemd	= @with_systemd@
@@ -232,6 +233,15 @@ CLANG = @CLANG@
 BITCODE_CFLAGS = @BITCODE_CFLAGS@
 BITCODE_CXXFLAGS = @BITCODE_CXXFLAGS@
 
+ifeq ($(with_openssl),yes)
+with_ssl = yes
+else ifeq ($(with_nss),yes)
+with_ssl = yes
+else
+with_ssl = no
+endif
+
+
 ##########################################################################
 #
 # Programs and flags
diff --git a/src/backend/libpq/Makefile b/src/backend/libpq/Makefile
index efc5ef760a..191266a426 100644
--- a/src/backend/libpq/Makefile
+++ b/src/backend/libpq/Makefile
@@ -30,6 +30,10 @@ OBJS = \
 
 ifeq ($(with_openssl),yes)
 OBJS += be-secure-openssl.o
+else
+ifeq ($(with_nss),yes)
+OBJS += be-secure-nss.o
+endif
 endif
 
 ifeq ($(with_gssapi),yes)
diff --git a/src/backend/libpq/auth.c b/src/backend/libpq/auth.c
index 36565df4fc..ea6d97585e 100644
--- a/src/backend/libpq/auth.c
+++ b/src/backend/libpq/auth.c
@@ -2870,7 +2870,14 @@ CheckCertAuth(Port *port)
 {
 	int			status_check_usermap = STATUS_ERROR;
 
+#if defined(USE_OPENSSL)
 	Assert(port->ssl);
+#elif defined(USE_NSS)
+	/* TODO: should we rename pr_fd to ssl, to keep consistency? */
+	Assert(port->pr_fd);
+#else
+	Assert(false);
+#endif
 
 	/* Make sure we have received a username in the certificate */
 	if (port->peer_cn == NULL ||
diff --git a/src/backend/libpq/be-secure-nss.c b/src/backend/libpq/be-secure-nss.c
new file mode 100644
index 0000000000..a3072717e1
--- /dev/null
+++ b/src/backend/libpq/be-secure-nss.c
@@ -0,0 +1,1158 @@
+/*-------------------------------------------------------------------------
+ *
+ * be-secure-nss.c
+ *	  functions for supporting NSS as a TLS backend
+ *
+ *
+ * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ *	  src/backend/libpq/be-secure-nss.c
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#include "postgres.h"
+
+#include <sys/stat.h>
+
+/*
+ * BITS_PER_BYTE is also defined in the NSPR header files, so we need to undef
+ * our version to avoid compiler warnings on redefinition.
+ */
+#define pg_BITS_PER_BYTE BITS_PER_BYTE
+#undef BITS_PER_BYTE
+
+/*
+ * The nspr/obsolete/protypes.h NSPR header typedefs uint64 and int64 with
+ * colliding definitions from ours, causing a much expected compiler error.
+ * The definitions are however not actually used in NSPR at all, and are only
+ * intended for what seems to be backwards compatibility for apps written
+ * against old versions of NSPR.  The following comment is in the referenced
+ * file, and was added in 1998:
+ *
+ *		This section typedefs the old 'native' types to the new PR<type>s.
+ *		These definitions are scheduled to be eliminated at the earliest
+ *		possible time. The NSPR API is implemented and documented using
+ *		the new definitions.
+ *
+ * As there is no opt-out from pulling in these typedefs, we define the guard
+ * for the file to exclude it. This is incredibly ugly, but seems to be about
+ * the only way around it.
+ */
+#define PROTYPES_H
+#include <nspr.h>
+#undef PROTYPES_H
+#include <nss.h>
+#include <base64.h>
+#include <cert.h>
+#include <certdb.h>
+#include <keyhi.h>
+#include <pk11pub.h>
+#include <prerror.h>
+#include <prio.h>
+#include <prmem.h>
+#include <prtypes.h>
+#include <secder.h>
+#include <secerr.h>
+#include <secitem.h>
+#include <secport.h>
+#include <ssl.h>
+#include <sslerr.h>
+#include <sslproto.h>
+
+/*
+ * Ensure that the colliding definitions match, else throw an error. In case
+ * NSPR has removed the definition for some reason, make sure to put ours
+ * back again.
+ */
+#if defined(BITS_PER_BYTE)
+#if BITS_PER_BYTE != pg_BITS_PER_BYTE
+#error "incompatible byte widths between NSPR and postgres"
+#endif
+#else
+#define BITS_PER_BYTE pg_BITS_PER_BYTE
+#endif
+#undef pg_BITS_PER_BYTE
+
+#include "common/pg_nss.h"
+#include "lib/stringinfo.h"
+#include "libpq/libpq.h"
+#include "nodes/pg_list.h"
+#include "miscadmin.h"
+#include "storage/fd.h"
+#include "utils/guc.h"
+#include "utils/memutils.h"
+
+
+/* default init hook can be overridden by a shared library */
+static void default_nss_tls_init(bool isServerStart);
+nss_tls_init_hook_type nss_tls_init_hook = default_nss_tls_init;
+
+static PRDescIdentity pr_id;
+
+static PRIOMethods pr_iomethods;
+static NSSInitContext * nss_context = NULL;
+static SSLVersionRange desired_sslver;
+
+static char *external_ssl_passphrase_cb(PK11SlotInfo *slot, PRBool retry, void *arg);
+static bool dummy_ssl_passwd_cb_called = false;
+static bool ssl_is_server_start;
+
+/*
+ * PR_ImportTCPSocket() is a private API, but very widely used, as it's the
+ * only way to make NSS use an already set up POSIX file descriptor rather
+ * than opening one itself. To quote the NSS documentation:
+ *
+ *		"In theory, code that uses PR_ImportTCPSocket may break when NSPR's
+ *		implementation changes. In practice, this is unlikely to happen because
+ *		NSPR's implementation has been stable for years and because of NSPR's
+ *		strong commitment to backward compatibility."
+ *
+ * https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSPR/Reference/PR_ImportTCPSocket
+ *
+ * The function is declared in <private/pprio.h>, but as it is a header marked
+ * private we declare it here rather than including it.
+ */
+NSPR_API(PRFileDesc *) PR_ImportTCPSocket(int);
+
+/* NSS IO layer callback overrides */
+static PRInt32 pg_ssl_read(PRFileDesc * fd, void *buf, PRInt32 amount,
+						   PRIntn flags, PRIntervalTime timeout);
+static PRInt32 pg_ssl_write(PRFileDesc * fd, const void *buf, PRInt32 amount,
+							PRIntn flags, PRIntervalTime timeout);
+/* Utility functions */
+static PRFileDesc * init_iolayer(Port *port, int loglevel);
+static uint16 ssl_protocol_version_to_nss(int v, const char *guc_name);
+
+static char *pg_SSLerrmessage(PRErrorCode errcode);
+static char *ssl_protocol_version_to_string(int v);
+static SECStatus pg_cert_auth_handler(void *arg, PRFileDesc * fd,
+									  PRBool checksig, PRBool isServer);
+static SECStatus pg_bad_cert_handler(void *arg, PRFileDesc * fd);
+static char *dummy_ssl_passphrase_cb(PK11SlotInfo * slot, PRBool retry, void *arg);
+
+/* ------------------------------------------------------------ */
+/*						 Public interface						*/
+/* ------------------------------------------------------------ */
+
+/*
+ * be_tls_init
+ *			Initialize the nss TLS library in the postmaster
+ *
+ * The majority of the setup needs to happen in be_tls_open_server since the
+ * NSPR initialization must happen after the forking of the backend. We could
+ * potentially move some parts in under !isServerStart, but so far this is the
+ * separation chosen.
+ */
+int
+be_tls_init(bool isServerStart)
+{
+	SECStatus	status;
+	SSLVersionRange supported_sslver;
+
+	/*
+	 * Set up the connection cache for multi-processing application behavior.
+	 * If we are in ServerStart then we initialize the cache. If the server is
+	 * already started, we inherit the cache such that it can be used for
+	 * connections. Calling SSL_ConfigMPServerSIDCache sets an environment
+	 * variable which contains enough information for the forked child to know
+	 * how to access it.  Passing NULL to SSL_InheritMPServerSIDCache will
+	 * make the forked child look it up by the default name SSL_INHERITANCE,
+	 * if env vars aren't inherited then the contents of the variable can be
+	 * passed instead.
+	 */
+	if (isServerStart)
+	{
+		/*
+		 * SSLv2 and SSLv3 are disabled in this TLS backend, but when setting
+		 * up the required session cache for NSS we still must supply timeout
+		 * values for v2 and The minimum allowed value for both is 5 seconds,
+		 * so opt for that in both cases (the defaults being 100 seconds and
+		 * 24 hours).
+		 *
+		 * Passing NULL as the directory for the session cache will default to
+		 * using /tmp on UNIX and \\temp on Windows.  Deciding if we want to
+		 * keep closer control on this directory is left as a TODO.
+		 */
+		status = SSL_ConfigMPServerSIDCache(MaxConnections, 5, 5, NULL);
+		if (status != SECSuccess)
+			ereport(FATAL,
+					(errmsg("unable to set up TLS connection cache: %s",
+							pg_SSLerrmessage(PR_GetError()))));
+
+	}
+	else
+	{
+		status = SSL_InheritMPServerSIDCache(NULL);
+		if (status != SECSuccess)
+		{
+			ereport(LOG,
+					(errmsg("unable to connect to TLS connection cache: %s",
+							pg_SSLerrmessage(PR_GetError()))));
+			return -1;
+		}
+	}
+
+	if (!ssl_database || strlen(ssl_database) == 0)
+	{
+		ereport(isServerStart ? FATAL : LOG,
+				(errmsg("no certificate database specified")));
+		goto error;
+	}
+
+	/*
+	 * We check for the desired TLS version range here, even though we cannot
+	 * set it until be_open_server such that we can be compatible with how the
+	 * OpenSSL backend reports errors for incompatible range configurations.
+	 * Set either the default supported TLS version range, or the configured
+	 * range from ssl_min_protocol_version and ssl_max_protocol version. In
+	 * case the user hasn't defined the maximum allowed version we fall back
+	 * to the highest version TLS that the library supports.
+	 */
+	if (SSL_VersionRangeGetSupported(ssl_variant_stream, &supported_sslver) != SECSuccess)
+	{
+		ereport(isServerStart ? FATAL : LOG,
+				(errmsg("unable to get default protocol support from NSS")));
+		goto error;
+	}
+
+	/*
+	 * Set the fallback versions for the TLS protocol version range to a
+	 * combination of our minimal requirement and the library maximum.
+	 */
+	desired_sslver.min = SSL_LIBRARY_VERSION_TLS_1_0;
+	desired_sslver.max = supported_sslver.max;
+
+	if (ssl_min_protocol_version)
+	{
+		int			ver = ssl_protocol_version_to_nss(ssl_min_protocol_version,
+													  "ssl_min_protocol_version");
+
+		if (ver == -1)
+		{
+			ereport(isServerStart ? FATAL : LOG,
+					(errmsg("\"%s\" setting \"%s\" not supported by this build",
+							"ssl_min_protocol_version",
+							GetConfigOption("ssl_min_protocol_version",
+											false, false))));
+			goto error;
+		}
+
+		if (ver > 0)
+			desired_sslver.min = ver;
+	}
+
+	if (ssl_max_protocol_version)
+	{
+		int			ver = ssl_protocol_version_to_nss(ssl_max_protocol_version,
+													  "ssl_max_protocol_version");
+
+		if (ver == -1)
+		{
+			ereport(isServerStart ? FATAL : LOG,
+					(errmsg("\"%s\" setting \"%s\" not supported by this build",
+							"ssl_max_protocol_version",
+							GetConfigOption("ssl_max_protocol_version",
+											false, false))));
+			goto error;
+		}
+		if (ver > 0)
+			desired_sslver.max = ver;
+
+		if (ver < desired_sslver.min)
+		{
+			ereport(isServerStart ? FATAL : LOG,
+					(errmsg("could not set SSL protocol version range"),
+					 errdetail("\"%s\" cannot be higher than \"%s\"",
+							   "ssl_min_protocol_version",
+							   "ssl_max_protocol_version")));
+			goto error;
+		}
+	}
+
+	/*
+	 * Set the passphrase callback which will be used both to obtain the
+	 * passphrase from the user, as well as by NSS to obtain the phrase
+	 * repeatedly.
+	 */
+	ssl_is_server_start = isServerStart;
+	(*nss_tls_init_hook) (isServerStart);
+
+	return 0;
+error:
+	return -1;
+}
+
+int
+be_tls_open_server(Port *port)
+{
+	SECStatus	status;
+	PRFileDesc *model;
+	PRFileDesc *pr_fd;
+	PRFileDesc *layer;
+	CERTCertificate *server_cert;
+	SECKEYPrivateKey *private_key;
+	CERTSignedCrl *crl;
+	SECItem		crlname;
+	char	   *cert_database;
+	NSSInitParameters params;
+
+	/*
+	 * The NSPR documentation states that runtime initialization via PR_Init
+	 * is no longer required, as the first caller into NSPR will perform the
+	 * initialization implicitly. The documentation doesn't however clarify
+	 * from which version this is holds true, so let's perform the potentially
+	 * superfluous initialization anyways to avoid crashing on older versions
+	 * of NSPR, as there is no difference in overhead.  The NSS documentation
+	 * still states that PR_Init must be called in some way (implicitly or
+	 * explicitly).
+	 *
+	 * The below parameters are what the implicit initialization would've done
+	 * for us, and should work even for older versions where it might not be
+	 * done automatically. The last parameter, maxPTDs, is set to various
+	 * values in other codebases, but has been unused since NSPR 2.1 which was
+	 * released sometime in 1998.
+	 */
+	PR_Init(PR_USER_THREAD, PR_PRIORITY_NORMAL, 0 /* maxPTDs */ );
+
+	/*
+	 * The certificate path (configdir) must contain a valid NSS database. If
+	 * the certificate path isn't a valid directory, NSS will fall back on the
+	 * system certificate database. If the certificate path is a directory but
+	 * is empty then the initialization will fail. On the client side this can
+	 * be allowed for any sslmode but the verify-xxx ones.
+	 * https://bugzilla.redhat.com/show_bug.cgi?id=728562 For the server side
+	 * we wont allow this to fail however, as we require the certificate and
+	 * key to exist.
+	 *
+	 * The original design of NSS was for a single application to use a single
+	 * copy of it, initialized with NSS_Initialize() which isn't returning any
+	 * handle with which to refer to NSS. NSS initialization and shutdown are
+	 * global for the application, so a shutdown in another NSS enabled
+	 * library would cause NSS to be stopped for libpq as well.  The fix has
+	 * been to introduce NSS_InitContext which returns a context handle to
+	 * pass to NSS_ShutdownContext.  NSS_InitContext was introduced in NSS
+	 * 3.12, but the use of it is not very well documented.
+	 * https://bugzilla.redhat.com/show_bug.cgi?id=738456
+	 *
+	 * The InitParameters struct passed can be used to override internal
+	 * values in NSS, but the usage is not documented at all. When using
+	 * NSS_Init initializations, the values are instead set via PK11_Configure
+	 * calls so the PK11_Configure documentation can be used to glean some
+	 * details on these.
+	 *
+	 * https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS/PKCS11/Module_Specs
+	 */
+	memset(&params, '\0', sizeof(params));
+	params.length = sizeof(params);
+
+	if (!ssl_database || strlen(ssl_database) == 0)
+		ereport(FATAL,
+				(errmsg("no certificate database specified")));
+
+	cert_database = psprintf("sql:%s", ssl_database);
+	nss_context = NSS_InitContext(cert_database, "", "", "",
+								  &params,
+								  NSS_INIT_READONLY | NSS_INIT_PK11RELOAD);
+	pfree(cert_database);
+
+	if (!nss_context)
+		ereport(FATAL,
+				(errmsg("unable to read certificate database \"%s\": %s",
+						ssl_database, pg_SSLerrmessage(PR_GetError()))));
+
+	/*
+	 * Import the already opened socket as we don't want to use NSPR functions
+	 * for opening the network socket due to how the PostgreSQL protocol works
+	 * with TLS connections. This function is not part of the NSPR public API,
+	 * see the comment at the top of the file for the rationale of still using
+	 * it.
+	 */
+	pr_fd = PR_ImportTCPSocket(port->sock);
+	if (!pr_fd)
+		ereport(ERROR,
+				(errmsg("unable to connect to socket")));
+
+	/*
+	 * Most of the documentation available, and implementations of, NSS/NSPR
+	 * use the PR_NewTCPSocket() function here, which has the drawback that it
+	 * can only create IPv4 sockets. Instead use PR_OpenTCPSocket() which
+	 * copes with IPv6 as well.
+	 */
+	model = PR_OpenTCPSocket(port->laddr.addr.ss_family);
+	if (!model)
+		ereport(ERROR,
+				(errmsg("unable to open socket")));
+
+	/*
+	 * Convert the NSPR socket to an SSL socket. Ensuring the success of this
+	 * operation is critical as NSS SSL_* functions may return SECSuccess on
+	 * the socket even though SSL hasn't been enabled, which introduce a risk
+	 * of silent downgrades.
+	 */
+	model = SSL_ImportFD(NULL, model);
+	if (!model)
+		ereport(ERROR,
+				(errmsg("unable to enable TLS on socket")));
+
+	/*
+	 * Configure basic settings for the connection over the SSL socket in
+	 * order to set it up as a server.
+	 */
+	if (SSL_OptionSet(model, SSL_SECURITY, PR_TRUE) != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to configure TLS connection")));
+
+	if (SSL_OptionSet(model, SSL_HANDSHAKE_AS_SERVER, PR_TRUE) != SECSuccess ||
+		SSL_OptionSet(model, SSL_HANDSHAKE_AS_CLIENT, PR_FALSE) != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to configure TLS connection as server")));
+
+	/*
+	 * SSLv2 is disabled by default, and SSLv3 will be excluded from the range
+	 * of allowed protocols further down. Since we really don't want these to
+	 * ever be enabled, let's use belts and suspenders and explicitly turn
+	 * them off as well.
+	 */
+	SSL_OptionSet(model, SSL_ENABLE_SSL2, PR_FALSE);
+	SSL_OptionSet(model, SSL_ENABLE_SSL3, PR_FALSE);
+
+#ifdef SSL_CBC_RANDOM_IV
+
+	/*
+	 * Enable protection against the BEAST attack in case the NSS server has
+	 * support for that. While SSLv3 is disabled, we may still allow TLSv1
+	 * which is affected. The option isn't documented as an SSL option, but as
+	 * an NSS environment variable.
+	 */
+	SSL_OptionSet(model, SSL_CBC_RANDOM_IV, PR_TRUE);
+#endif
+
+	/*
+	 * Configure the allowed cipher. If there are no user preferred suites,
+	 * set the domestic policy. TODO: while this code works, the set of
+	 * ciphers which can be set and still end up with a working socket is
+	 * woefully underdocumented for anything more recent than SSLv3 (the code
+	 * for TLS actually calls ssl3 functions under the hood for
+	 * SSL_CipherPrefSet), so it's unclear if this is helpful or not. Using
+	 * the policies works, but may be too coarsely grained.
+	 *
+	 * Another TODO: The SSL_ImplementedCiphers table returned with calling
+	 * SSL_GetImplementedCiphers is sorted in server preference order. Sorting
+	 * SSLCipherSuites according to the order of the ciphers therein could be
+	 * a way to implement ssl_prefer_server_ciphers - if we at all want to use
+	 * cipher selection for NSS like how we do it for OpenSSL that is.
+	 */
+
+	/*
+	 * If no ciphers are specified, we use the domestic policy
+	 */
+	if (!SSLCipherSuites || strlen(SSLCipherSuites) == 0)
+	{
+		status = NSS_SetDomesticPolicy();
+		if (status != SECSuccess)
+			ereport(ERROR,
+					(errmsg("unable to set cipher policy: %s",
+							pg_SSLerrmessage(PR_GetError()))));
+	}
+	else
+	{
+		char	   *ciphers,
+				   *c;
+
+		char	   *sep = ":;, ";
+		PRUint16	ciphercode;
+		const		PRUint16 *nss_ciphers;
+
+		/*
+		 * If the user has specified a set of preferred cipher suites we start
+		 * by turning off all the existing suites to avoid the risk of down-
+		 * grades to a weaker cipher than expected.
+		 */
+		nss_ciphers = SSL_GetImplementedCiphers();
+		for (int i = 0; i < SSL_GetNumImplementedCiphers(); i++)
+			SSL_CipherPrefSet(model, nss_ciphers[i], PR_FALSE);
+
+		ciphers = pstrdup(SSLCipherSuites);
+
+		for (c = strtok(ciphers, sep); c; c = strtok(NULL, sep))
+		{
+			ciphercode = pg_find_cipher(c);
+			if (ciphercode != INVALID_CIPHER)
+			{
+				status = SSL_CipherPrefSet(model, ciphercode, PR_TRUE);
+				if (status != SECSuccess)
+					ereport(ERROR,
+							(errmsg("invalid cipher-suite specified: %s", c)));
+			}
+		}
+
+		pfree(ciphers);
+	}
+
+	if (SSL_VersionRangeSet(model, &desired_sslver) != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to set requested SSL protocol version range")));
+
+	/*
+	 * Set up the custom IO layer.
+	 */
+	layer = init_iolayer(port, ERROR);
+	if (!layer)
+		goto error;
+
+	/* Store the Port as private data available in callbacks */
+	layer->secret = (void *) port;
+
+	if (PR_PushIOLayer(pr_fd, PR_TOP_IO_LAYER, layer) != PR_SUCCESS)
+	{
+		PR_Close(layer);
+		ereport(ERROR,
+				(errmsg("unable to push IO layer")));
+	}
+
+	server_cert = PK11_FindCertFromNickname(ssl_cert_file, (void *) port);
+	if (!server_cert)
+	{
+		if (dummy_ssl_passwd_cb_called)
+			ereport(ERROR,
+					(errmsg("unable to load certificate for \"%s\": %s",
+							ssl_cert_file, pg_SSLerrmessage(PR_GetError())),
+					 errhint("The certificate requires a password.")));
+		else
+			ereport(ERROR,
+					(errmsg("unable to find certificate for \"%s\": %s",
+							ssl_cert_file, pg_SSLerrmessage(PR_GetError()))));
+	}
+
+	private_key = PK11_FindKeyByAnyCert(server_cert, (void *) port);
+	if (!private_key)
+	{
+		if (dummy_ssl_passwd_cb_called)
+			ereport(ERROR,
+					(errmsg("unable to load private key for \"%s\": %s",
+							ssl_cert_file, pg_SSLerrmessage(PR_GetError())),
+					 errhint("The private key requires a password.")));
+		else
+			ereport(ERROR,
+					(errmsg("unable to find private key for \"%s\": %s",
+							ssl_cert_file, pg_SSLerrmessage(PR_GetError()))));
+	}
+
+	/*
+	 * NSS doesn't use CRL files on disk, so we use the ssl_crl_file guc to
+	 * contain the CRL nickname for the current server certificate in the NSS
+	 * certificate database. The main difference from the OpenSSL backend is
+	 * that NSS will use the CRL regardless, but being able to make sure the
+	 * CRL is loaded seems like a good feature.
+	 */
+	if (ssl_crl_file[0])
+	{
+		SECITEM_CopyItem(NULL, &crlname, &server_cert->derSubject);
+		crl = SEC_FindCrlByName(CERT_GetDefaultCertDB(), &crlname, SEC_CRL_TYPE);
+		if (!crl)
+			ereport(ERROR,
+					(errmsg("specified CRL not found in database")));
+		SEC_DestroyCrl(crl);
+	}
+
+	/*
+	 * Finally we must configure the socket for being a server by setting the
+	 * certificate and key.
+	 */
+	status = SSL_ConfigSecureServer(model, server_cert, private_key, kt_rsa);
+	if (status != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to configure secure server: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+	status = SSL_ConfigServerCert(model, server_cert, private_key, NULL, 0);
+	if (status != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to configure server for TLS server connections: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+
+	ssl_loaded_verify_locations = true;
+
+	/*
+	 * At this point, we no longer have use for the certificate and private
+	 * key as they have been copied into the context by NSS. Destroy our
+	 * copies explicitly to clean out the memory as best we can.
+	 */
+	CERT_DestroyCertificate(server_cert);
+	SECKEY_DestroyPrivateKey(private_key);
+
+	status = SSL_AuthCertificateHook(model, pg_cert_auth_handler, (void *) port);
+	if (status != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to install authcert hook: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+	SSL_BadCertHook(model, pg_bad_cert_handler, (void *) port);
+	SSL_OptionSet(model, SSL_REQUEST_CERTIFICATE, PR_TRUE);
+	SSL_OptionSet(model, SSL_REQUIRE_CERTIFICATE, PR_FALSE);
+
+	port->pr_fd = SSL_ImportFD(model, pr_fd);
+	if (!port->pr_fd)
+		ereport(ERROR,
+				(errmsg("unable to initialize")));
+
+	PR_Close(model);
+
+	/*
+	 * Force a handshake on the next I/O request, the second parameter means
+	 * that we are a server, PR_FALSE would indicate being a client. NSPR
+	 * requires us to call SSL_ResetHandshake since we imported an already
+	 * established socket.
+	 */
+	status = SSL_ResetHandshake(port->pr_fd, PR_TRUE);
+	if (status != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to initiate handshake: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+	status = SSL_ForceHandshake(port->pr_fd);
+	if (status != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to handshake: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+
+	port->ssl_in_use = true;
+	return 0;
+
+error:
+	return 1;
+}
+
+ssize_t
+be_tls_read(Port *port, void *ptr, size_t len, int *waitfor)
+{
+	ssize_t		n_read;
+	PRErrorCode err;
+
+	n_read = PR_Read(port->pr_fd, ptr, len);
+
+	if (n_read < 0)
+	{
+		err = PR_GetError();
+
+		/* XXX: This logic seems potentially bogus? */
+		if (err == PR_WOULD_BLOCK_ERROR)
+			*waitfor = WL_SOCKET_READABLE;
+		else
+			*waitfor = WL_SOCKET_WRITEABLE;
+	}
+
+	return n_read;
+}
+
+ssize_t
+be_tls_write(Port *port, void *ptr, size_t len, int *waitfor)
+{
+	ssize_t		n_write;
+	PRErrorCode err;
+
+	n_write = PR_Send(port->pr_fd, ptr, len, 0, PR_INTERVAL_NO_WAIT);
+
+	if (n_write < 0)
+	{
+		err = PR_GetError();
+
+		if (err == PR_WOULD_BLOCK_ERROR)
+			*waitfor = WL_SOCKET_WRITEABLE;
+		else
+			*waitfor = WL_SOCKET_READABLE;
+	}
+
+	return n_write;
+}
+
+void
+be_tls_close(Port *port)
+{
+	if (!port)
+		return;
+
+	if (port->peer_cn)
+	{
+		SSL_InvalidateSession(port->pr_fd);
+		pfree(port->peer_cn);
+		port->peer_cn = NULL;
+	}
+
+	PR_Close(port->pr_fd);
+	port->pr_fd = NULL;
+	port->ssl_in_use = false;
+
+	if (nss_context)
+	{
+		NSS_ShutdownContext(nss_context);
+		nss_context = NULL;
+	}
+}
+
+void
+be_tls_destroy(void)
+{
+	/*
+	 * It reads a bit odd to clear a session cache when we are destroying the
+	 * context altogether, but if the session cache isn't cleared before
+	 * shutting down the context it will fail with SEC_ERROR_BUSY.
+	 */
+	SSL_ClearSessionCache();
+}
+
+int
+be_tls_get_cipher_bits(Port *port)
+{
+	SECStatus	status;
+	SSLChannelInfo channel;
+	SSLCipherSuiteInfo suite;
+
+	status = SSL_GetChannelInfo(port->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+		goto error;
+
+	status = SSL_GetCipherSuiteInfo(channel.cipherSuite, &suite, sizeof(suite));
+	if (status != SECSuccess)
+		goto error;
+
+	return suite.effectiveKeyBits;
+
+error:
+	ereport(WARNING,
+			(errmsg("unable to extract TLS session information: %s",
+					pg_SSLerrmessage(PR_GetError()))));
+	return 0;
+}
+
+/*
+ * be_tls_get_compression
+ *
+ * NSS disabled support for TLS compression in version 3.33 and removed the
+ * code in a subsequent release. The API for retrieving information about
+ * compression as well as enabling it is kept for backwards compatibility, but
+ * we don't need to consult it since it was only available for SSLv3 which we
+ * don't support.
+ *
+ * https://bugzilla.mozilla.org/show_bug.cgi?id=1409587
+ */
+bool
+be_tls_get_compression(Port *port)
+{
+	return false;
+}
+
+/*
+ * be_tls_get_version
+ *
+ * Returns the protocol version used for the current connection, or NULL in
+ * case of errors.
+ */
+const char *
+be_tls_get_version(Port *port)
+{
+	SECStatus	status;
+	SSLChannelInfo channel;
+
+	status = SSL_GetChannelInfo(port->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+	{
+		ereport(WARNING,
+				(errmsg("unable to extract TLS session information: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+		return NULL;
+	}
+
+	return ssl_protocol_version_to_string(channel.protocolVersion);
+}
+
+const char *
+be_tls_get_cipher(Port *port)
+{
+	SECStatus	status;
+	SSLChannelInfo channel;
+	SSLCipherSuiteInfo suite;
+
+	status = SSL_GetChannelInfo(port->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+		goto error;
+
+	status = SSL_GetCipherSuiteInfo(channel.cipherSuite, &suite, sizeof(suite));
+	if (status != SECSuccess)
+		goto error;
+
+	return suite.cipherSuiteName;
+
+error:
+	ereport(WARNING,
+			(errmsg("unable to extract TLS session information: %s",
+					pg_SSLerrmessage(PR_GetError()))));
+	return NULL;
+}
+
+void
+be_tls_get_peer_subject_name(Port *port, char *ptr, size_t len)
+{
+	CERTCertificate *certificate;
+
+	certificate = SSL_PeerCertificate(port->pr_fd);
+	if (certificate)
+		strlcpy(ptr, CERT_NameToAscii(&certificate->subject), len);
+	else
+		ptr[0] = '\0';
+}
+
+void
+be_tls_get_peer_issuer_name(Port *port, char *ptr, size_t len)
+{
+	CERTCertificate *certificate;
+
+	certificate = SSL_PeerCertificate(port->pr_fd);
+	if (certificate)
+		strlcpy(ptr, CERT_NameToAscii(&certificate->issuer), len);
+	else
+		ptr[0] = '\0';
+}
+
+void
+be_tls_get_peer_serial(Port *port, char *ptr, size_t len)
+{
+	CERTCertificate *certificate;
+
+	certificate = SSL_PeerCertificate(port->pr_fd);
+	if (certificate)
+		snprintf(ptr, len, "%li", DER_GetInteger(&(certificate->serialNumber)));
+	else
+		ptr[0] = '\0';
+}
+
+/* ------------------------------------------------------------ */
+/*						Internal functions						*/
+/* ------------------------------------------------------------ */
+
+/*
+ * default_nss_tls_init
+ *
+ * The default TLS init hook function which users can override for installing
+ * their own passphrase callbacks and similar actions. In case no callback has
+ * been configured, or the callback isn't reload capable during a server
+ * reload, the dummy callback will be installed.
+ *
+ * The private data for the callback is set differently depending on how it's
+ * invoked. For calls which may invoke the callback deeper in the callstack
+ * the private data is set with SSL_SetPKCS11PinArg. When the call is directly
+ * invoking the callback, like PK11_FindCertFromNickname, then the private
+ * data is passed as a parameter. Setting the data with SSL_SetPKCS11PinArg is
+ * thus not required but good practice.
+ *
+ * NSS doesn't provide a default callback like OpenSSL does, but a callback is
+ * required to be set.  The password callback can be installed at any time, but
+ * setting the private data with SSL_SetPKCS11PinArg requires a PR Filedesc.
+ */
+static void
+default_nss_tls_init(bool isServerStart)
+{
+	/*
+	 * No user-defined callback has been configured, install the dummy call-
+	 * back since we must set something.
+	 */
+	if (!ssl_passphrase_command[0])
+		PK11_SetPasswordFunc(dummy_ssl_passphrase_cb);
+	else
+	{
+		/*
+		 * There is a user-defined callback, set it unless we are in a restart
+		 * and cannot handle restarts due to an interactive callback.
+		 */
+		if (isServerStart)
+			PK11_SetPasswordFunc(external_ssl_passphrase_cb);
+		else
+		{
+			if (ssl_passphrase_command_supports_reload)
+				PK11_SetPasswordFunc(external_ssl_passphrase_cb);
+			else
+				PK11_SetPasswordFunc(dummy_ssl_passphrase_cb);
+		}
+	}
+}
+
+/*
+ * external_ssl_passphrase_cb
+ *
+ * Runs the callback configured by ssl_passphrase_command and returns the
+ * captured password back to NSS.
+ */
+static char *
+external_ssl_passphrase_cb(PK11SlotInfo *slot, PRBool retry, void *arg)
+{
+	/*
+	 * NSS use a hardcoded 256 byte buffer for reading the password so set the
+	 * same limit for our callback buffer.
+	 */
+	char		buf[256];
+	int			len;
+	char	   *password = NULL;
+	char	   *prompt;
+
+	/*
+	 * Since there is no password callback in NSS when the server starts up,
+	 * it makes little sense to create an interactive callback. Thus, if this
+	 * is a retry attempt then give up immediately.
+	 */
+	if (retry)
+		return NULL;
+
+	/*
+	 * Construct the same prompt that NSS uses internally even though it is
+	 * unlikely to serve much purpose, but we must set a prompt so we might
+	 * as well do it right.
+	 */
+	prompt = psprintf("Enter Password or Pin for \"%s\":",
+					  PK11_GetTokenName(slot));
+
+	len = run_ssl_passphrase_command(prompt, ssl_is_server_start, buf, sizeof(buf));
+	pfree(prompt);
+
+	if (!len)
+		return NULL;
+
+	/*
+	 * At least one byte with password content was returned, and NSS requires
+	 * that we return it allocated in NSS controlled memory. If we fail to
+	 * allocate then abort without passing back NULL and bubble up the error
+	 * on the PG side.
+	 */
+	password = (char *) PR_Malloc(len + 1);
+	if (!password)
+		ereport(ERROR,
+				(errcode(ERRCODE_OUT_OF_MEMORY),
+				 errmsg("out of memory")));
+	strlcpy(password, buf, sizeof(password));
+	explicit_bzero(buf, sizeof(buf));
+
+	return password;
+}
+
+/*
+ * dummy_ssl_passphrase_cb
+ *
+ * Return unsuccessful if we are asked to provide the passphrase for a cert or
+ * key, without having a passphrase callback installed.
+ */
+static char *
+dummy_ssl_passphrase_cb(PK11SlotInfo *slot, PRBool retry, void *arg)
+{
+	dummy_ssl_passwd_cb_called = true;
+	return NULL;
+}
+
+static SECStatus
+pg_bad_cert_handler(void *arg, PRFileDesc * fd)
+{
+	Port	   *port = (Port *) arg;
+
+	port->peer_cert_valid = false;
+	return SECFailure;
+}
+
+static SECStatus
+pg_cert_auth_handler(void *arg, PRFileDesc * fd, PRBool checksig, PRBool isServer)
+{
+	SECStatus	status;
+	Port	   *port = (Port *) arg;
+	CERTCertificate *cert;
+	char	   *peer_cn;
+	int			len;
+
+	status = SSL_AuthCertificate(CERT_GetDefaultCertDB(), port->pr_fd, checksig, PR_TRUE);
+	if (status == SECSuccess)
+	{
+		cert = SSL_PeerCertificate(port->pr_fd);
+		len = strlen(cert->subjectName);
+		peer_cn = MemoryContextAllocZero(TopMemoryContext, len + 1);
+		if (strncmp(cert->subjectName, "CN=", 3) == 0)
+			strlcpy(peer_cn, cert->subjectName + strlen("CN="), len + 1);
+		else
+			strlcpy(peer_cn, cert->subjectName, len + 1);
+		CERT_DestroyCertificate(cert);
+
+		port->peer_cn = peer_cn;
+		port->peer_cert_valid = true;
+	}
+
+	return status;
+}
+
+static PRInt32
+pg_ssl_read(PRFileDesc * fd, void *buf, PRInt32 amount, PRIntn flags,
+			PRIntervalTime timeout)
+{
+	PRRecvFN	read_fn;
+	PRInt32		n_read;
+
+	read_fn = fd->lower->methods->recv;
+	n_read = read_fn(fd->lower, buf, amount, flags, timeout);
+
+	return n_read;
+}
+
+static PRInt32
+pg_ssl_write(PRFileDesc * fd, const void *buf, PRInt32 amount, PRIntn flags,
+			 PRIntervalTime timeout)
+{
+	PRSendFN	send_fn;
+	PRInt32		n_write;
+
+	send_fn = fd->lower->methods->send;
+	n_write = send_fn(fd->lower, buf, amount, flags, timeout);
+
+	return n_write;
+}
+
+static PRFileDesc *
+init_iolayer(Port *port, int loglevel)
+{
+	const		PRIOMethods *default_methods;
+	PRFileDesc *layer;
+
+	/*
+	 * Start by initializing our layer with all the default methods so that we
+	 * can selectively override the ones we want while still ensuring that we
+	 * have a complete layer specification.
+	 */
+	default_methods = PR_GetDefaultIOMethods();
+	memcpy(&pr_iomethods, default_methods, sizeof(PRIOMethods));
+
+	pr_iomethods.recv = pg_ssl_read;
+	pr_iomethods.send = pg_ssl_write;
+
+	/*
+	 * Each IO layer must be identified by a unique name, where uniqueness is
+	 * per connection. Each connection in a postgres cluster can generate the
+	 * identity from the same string as they will create their IO layers on
+	 * different sockets. Only one layer per socket can have the same name.
+	 */
+	pr_id = PR_GetUniqueIdentity("PostgreSQL");
+	if (pr_id == PR_INVALID_IO_LAYER)
+	{
+		ereport(loglevel,
+				(errmsg("out of memory when setting up TLS connection")));
+		return NULL;
+	}
+
+	/*
+	 * Create the actual IO layer as a stub such that it can be pushed onto
+	 * the layer stack. The step via a stub is required as we define custom
+	 * callbacks.
+	 */
+	layer = PR_CreateIOLayerStub(pr_id, &pr_iomethods);
+	if (!layer)
+	{
+		ereport(loglevel,
+				(errmsg("unable to create NSS I/O layer")));
+		return NULL;
+	}
+
+	return layer;
+}
+
+static char *
+ssl_protocol_version_to_string(int v)
+{
+	switch (v)
+	{
+			/* SSL v2 and v3 are not supported */
+		case SSL_LIBRARY_VERSION_2:
+		case SSL_LIBRARY_VERSION_3_0:
+			Assert(false);
+			break;
+
+		case SSL_LIBRARY_VERSION_TLS_1_0:
+			return pstrdup("TLSv1.0");
+		case SSL_LIBRARY_VERSION_TLS_1_1:
+			return pstrdup("TLSv1.1");
+		case SSL_LIBRARY_VERSION_TLS_1_2:
+			return pstrdup("TLSv1.2");
+		case SSL_LIBRARY_VERSION_TLS_1_3:
+			return pstrdup("TLSv1.3");
+	}
+
+	return pstrdup("unknown");
+}
+
+
+/*
+ * ssl_protocol_version_to_nss
+ *			Translate PostgreSQL TLS version to NSS version
+ *
+ * Returns zero in case the requested TLS version is undefined (PG_ANY) and
+ * should be set by the caller, or -1 on failure.
+ */
+static uint16
+ssl_protocol_version_to_nss(int v, const char *guc_name)
+{
+	switch (v)
+	{
+			/*
+			 * There is no SSL_LIBRARY_ macro defined in NSS with the value
+			 * zero, so we use this to signal the caller that the highest
+			 * useful version should be set on the connection.
+			 */
+		case PG_TLS_ANY:
+			return 0;
+
+			/*
+			 * No guard is required here as there are no versions of NSS
+			 * without support for TLS1.
+			 */
+		case PG_TLS1_VERSION:
+			return SSL_LIBRARY_VERSION_TLS_1_0;
+		case PG_TLS1_1_VERSION:
+#ifdef SSL_LIBRARY_VERSION_TLS_1_1
+			return SSL_LIBRARY_VERSION_TLS_1_1;
+#else
+			break;
+#endif
+		case PG_TLS1_2_VERSION:
+#ifdef SSL_LIBRARY_VERSION_TLS_1_2
+			return SSL_LIBRARY_VERSION_TLS_1_2;
+#else
+			break;
+#endif
+		case PG_TLS1_3_VERSION:
+#ifdef SSL_LIBRARY_VERSION_TLS_1_3
+			return SSL_LIBRARY_VERSION_TLS_1_3;
+#else
+			break;
+#endif
+		default:
+			break;
+	}
+
+	return -1;
+}
+
+/*
+ * pg_SSLerrmessage
+ *		Create and return a human readable error message given
+ *		the specified error code
+ *
+ * PR_ErrorToName only converts the enum identifier of the error to string,
+ * but that can be quite useful for debugging (and in case PR_ErrorToString is
+ * unable to render a message then we at least have something).
+ */
+static char *
+pg_SSLerrmessage(PRErrorCode errcode)
+{
+	char		error[128];
+	int			ret;
+
+	/* TODO: this should perhaps use a StringInfo instead.. */
+	ret = pg_snprintf(error, sizeof(error), "%s (%s)",
+					  PR_ErrorToString(errcode, PR_LANGUAGE_I_DEFAULT),
+					  PR_ErrorToName(errcode));
+	if (ret)
+		return pstrdup(error);
+
+	return pstrdup(_("unknown TLS error"));
+}
diff --git a/src/backend/libpq/be-secure-openssl.c b/src/backend/libpq/be-secure-openssl.c
index 8b21ff4065..5962cffc0c 100644
--- a/src/backend/libpq/be-secure-openssl.c
+++ b/src/backend/libpq/be-secure-openssl.c
@@ -1298,15 +1298,28 @@ X509_NAME_to_cstring(X509_NAME *name)
 	char	   *dp;
 	char	   *result;
 
+	if (membuf == NULL)
+		ereport(ERROR,
+				(errcode(ERRCODE_OUT_OF_MEMORY),
+				 errmsg("failed to create BIO")));
+
 	(void) BIO_set_close(membuf, BIO_CLOSE);
 	for (i = 0; i < count; i++)
 	{
 		e = X509_NAME_get_entry(name, i);
 		nid = OBJ_obj2nid(X509_NAME_ENTRY_get_object(e));
+		if (nid == NID_undef)
+			ereport(ERROR,
+					(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
+					 errmsg("could not get NID for ASN1_OBJECT object")));
 		v = X509_NAME_ENTRY_get_data(e);
 		field_name = OBJ_nid2sn(nid);
 		if (!field_name)
 			field_name = OBJ_nid2ln(nid);
+		if (field_name == NULL)
+			ereport(ERROR,
+					(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
+					 errmsg("could not convert NID %d to an ASN1_OBJECT structure", nid)));
 		BIO_printf(membuf, "/%s=", field_name);
 		ASN1_STRING_print_ex(membuf, v,
 							 ((ASN1_STRFLGS_RFC2253 & ~ASN1_STRFLGS_ESC_MSB)
@@ -1322,7 +1335,8 @@ X509_NAME_to_cstring(X509_NAME *name)
 	result = pstrdup(dp);
 	if (dp != sp)
 		pfree(dp);
-	BIO_free(membuf);
+	if (BIO_free(membuf) != 1)
+		elog(ERROR, "could not free OpenSSL BIO structure");
 
 	return result;
 }
diff --git a/src/backend/libpq/be-secure.c b/src/backend/libpq/be-secure.c
index 2ae507a902..f39977b80c 100644
--- a/src/backend/libpq/be-secure.c
+++ b/src/backend/libpq/be-secure.c
@@ -49,6 +49,9 @@ bool		ssl_passphrase_command_supports_reload;
 #ifdef USE_SSL
 bool		ssl_loaded_verify_locations = false;
 #endif
+#ifdef USE_NSS
+char	   *ssl_database;
+#endif
 
 /* GUC variable controlling SSL cipher list */
 char	   *SSLCipherSuites = NULL;
diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c
index a62d64eaa4..050f673c68 100644
--- a/src/backend/utils/misc/guc.c
+++ b/src/backend/utils/misc/guc.c
@@ -4262,7 +4262,11 @@ static struct config_string ConfigureNamesString[] =
 		},
 		&ssl_library,
 #ifdef USE_SSL
+#if defined(USE_OPENSSL)
 		"OpenSSL",
+#elif defined(USE_NSS)
+		"NSS",
+#endif
 #else
 		"",
 #endif
@@ -4320,6 +4324,18 @@ static struct config_string ConfigureNamesString[] =
 		check_canonical_path, assign_pgstat_temp_directory, NULL
 	},
 
+#ifdef USE_NSS
+	{
+		{"ssl_database", PGC_SIGHUP, CONN_AUTH_SSL,
+			gettext_noop("Location of the NSS certificate database."),
+			NULL
+		},
+		&ssl_database,
+		"",
+		NULL, NULL, NULL
+	},
+#endif
+
 	{
 		{"synchronous_standby_names", PGC_SIGHUP, REPLICATION_PRIMARY,
 			gettext_noop("Number of synchronous standbys and list of names of potential synchronous ones."),
@@ -4348,8 +4364,10 @@ static struct config_string ConfigureNamesString[] =
 			GUC_SUPERUSER_ONLY
 		},
 		&SSLCipherSuites,
-#ifdef USE_OPENSSL
+#if defined(USE_OPENSSL)
 		"HIGH:MEDIUM:+3DES:!aNULL",
+#elif defined (USE_NSS)
+		"",
 #else
 		"none",
 #endif
diff --git a/src/include/common/pg_nss.h b/src/include/common/pg_nss.h
new file mode 100644
index 0000000000..74298c8bb1
--- /dev/null
+++ b/src/include/common/pg_nss.h
@@ -0,0 +1,141 @@
+/*-------------------------------------------------------------------------
+ *
+ * pg_nss.h
+ *	  Support for NSS as a TLS backend
+ *
+ * These definitions are used by both frontend and backend code.
+ *
+ * Copyright (c) 2020, PostgreSQL Global Development Group
+ *
+ * IDENTIFICATION
+ *        src/include/common/pg_nss.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef PG_NSS_H
+#define PG_NSS_H
+
+#ifdef USE_NSS
+
+#include <sslproto.h>
+
+PRUint16	pg_find_cipher(char *name);
+
+typedef struct
+{
+	const char *name;
+	PRUint16	number;
+}			NSSCiphers;
+
+#define INVALID_CIPHER	0xFFFF
+
+/*
+ * This list is a partial copy of the ciphers in NSS files lib/ssl/sslproto.h
+ * in order to provide a human readable version of the ciphers. It would be
+ * nice to not have to have this, but NSS doesn't provide any API addressing
+ * the ciphers by name. TODO: do we want more of the ciphers, or perhaps less?
+ */
+static const NSSCiphers NSS_CipherList[] = {
+
+	{"TLS_NULL_WITH_NULL_NULL", TLS_NULL_WITH_NULL_NULL},
+
+	{"TLS_RSA_WITH_NULL_MD5", TLS_RSA_WITH_NULL_MD5},
+	{"TLS_RSA_WITH_NULL_SHA", TLS_RSA_WITH_NULL_SHA},
+	{"TLS_RSA_WITH_RC4_128_MD5", TLS_RSA_WITH_RC4_128_MD5},
+	{"TLS_RSA_WITH_RC4_128_SHA", TLS_RSA_WITH_RC4_128_SHA},
+	{"TLS_RSA_WITH_IDEA_CBC_SHA", TLS_RSA_WITH_IDEA_CBC_SHA},
+	{"TLS_RSA_WITH_DES_CBC_SHA", TLS_RSA_WITH_DES_CBC_SHA},
+	{"TLS_RSA_WITH_3DES_EDE_CBC_SHA", TLS_RSA_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_DH_DSS_WITH_DES_CBC_SHA", TLS_DH_DSS_WITH_DES_CBC_SHA},
+	{"TLS_DH_DSS_WITH_3DES_EDE_CBC_SHA", TLS_DH_DSS_WITH_3DES_EDE_CBC_SHA},
+	{"TLS_DH_RSA_WITH_DES_CBC_SHA", TLS_DH_RSA_WITH_DES_CBC_SHA},
+	{"TLS_DH_RSA_WITH_3DES_EDE_CBC_SHA", TLS_DH_RSA_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_DHE_DSS_WITH_DES_CBC_SHA", TLS_DHE_DSS_WITH_DES_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_3DES_EDE_CBC_SHA", TLS_DHE_DSS_WITH_3DES_EDE_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_DES_CBC_SHA", TLS_DHE_RSA_WITH_DES_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA", TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_DH_anon_WITH_RC4_128_MD5", TLS_DH_anon_WITH_RC4_128_MD5},
+	{"TLS_DH_anon_WITH_DES_CBC_SHA", TLS_DH_anon_WITH_DES_CBC_SHA},
+	{"TLS_DH_anon_WITH_3DES_EDE_CBC_SHA", TLS_DH_anon_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_RSA_WITH_AES_128_CBC_SHA", TLS_RSA_WITH_AES_128_CBC_SHA},
+	{"TLS_DH_DSS_WITH_AES_128_CBC_SHA", TLS_DH_DSS_WITH_AES_128_CBC_SHA},
+	{"TLS_DH_RSA_WITH_AES_128_CBC_SHA", TLS_DH_RSA_WITH_AES_128_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_AES_128_CBC_SHA", TLS_DHE_DSS_WITH_AES_128_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_AES_128_CBC_SHA", TLS_DHE_RSA_WITH_AES_128_CBC_SHA},
+	{"TLS_DH_anon_WITH_AES_128_CBC_SHA", TLS_DH_anon_WITH_AES_128_CBC_SHA},
+
+	{"TLS_RSA_WITH_AES_256_CBC_SHA", TLS_RSA_WITH_AES_256_CBC_SHA},
+	{"TLS_DH_DSS_WITH_AES_256_CBC_SHA", TLS_DH_DSS_WITH_AES_256_CBC_SHA},
+	{"TLS_DH_RSA_WITH_AES_256_CBC_SHA", TLS_DH_RSA_WITH_AES_256_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_AES_256_CBC_SHA", TLS_DHE_DSS_WITH_AES_256_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_AES_256_CBC_SHA", TLS_DHE_RSA_WITH_AES_256_CBC_SHA},
+	{"TLS_DH_anon_WITH_AES_256_CBC_SHA", TLS_DH_anon_WITH_AES_256_CBC_SHA},
+	{"TLS_RSA_WITH_NULL_SHA256", TLS_RSA_WITH_NULL_SHA256},
+	{"TLS_RSA_WITH_AES_128_CBC_SHA256", TLS_RSA_WITH_AES_128_CBC_SHA256},
+	{"TLS_RSA_WITH_AES_256_CBC_SHA256", TLS_RSA_WITH_AES_256_CBC_SHA256},
+
+	{"TLS_DHE_DSS_WITH_AES_128_CBC_SHA256", TLS_DHE_DSS_WITH_AES_128_CBC_SHA256},
+	{"TLS_RSA_WITH_CAMELLIA_128_CBC_SHA", TLS_RSA_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DH_DSS_WITH_CAMELLIA_128_CBC_SHA", TLS_DH_DSS_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DH_RSA_WITH_CAMELLIA_128_CBC_SHA", TLS_DH_RSA_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_CAMELLIA_128_CBC_SHA", TLS_DHE_DSS_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA", TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DH_anon_WITH_CAMELLIA_128_CBC_SHA", TLS_DH_anon_WITH_CAMELLIA_128_CBC_SHA},
+
+	{"TLS_DHE_DSS_WITH_RC4_128_SHA", TLS_DHE_DSS_WITH_RC4_128_SHA},
+	{"TLS_DHE_RSA_WITH_AES_128_CBC_SHA256", TLS_DHE_RSA_WITH_AES_128_CBC_SHA256},
+	{"TLS_DHE_DSS_WITH_AES_256_CBC_SHA256", TLS_DHE_DSS_WITH_AES_256_CBC_SHA256},
+	{"TLS_DHE_RSA_WITH_AES_256_CBC_SHA256", TLS_DHE_RSA_WITH_AES_256_CBC_SHA256},
+
+	{"TLS_RSA_WITH_CAMELLIA_256_CBC_SHA", TLS_RSA_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DH_DSS_WITH_CAMELLIA_256_CBC_SHA", TLS_DH_DSS_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DH_RSA_WITH_CAMELLIA_256_CBC_SHA", TLS_DH_RSA_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_CAMELLIA_256_CBC_SHA", TLS_DHE_DSS_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA", TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DH_anon_WITH_CAMELLIA_256_CBC_SHA", TLS_DH_anon_WITH_CAMELLIA_256_CBC_SHA},
+
+	{"TLS_RSA_WITH_SEED_CBC_SHA", TLS_RSA_WITH_SEED_CBC_SHA},
+
+	{"TLS_RSA_WITH_AES_128_GCM_SHA256", TLS_RSA_WITH_AES_128_GCM_SHA256},
+	{"TLS_RSA_WITH_AES_256_GCM_SHA384", TLS_RSA_WITH_AES_256_GCM_SHA384},
+	{"TLS_DHE_RSA_WITH_AES_128_GCM_SHA256", TLS_DHE_RSA_WITH_AES_128_GCM_SHA256},
+	{"TLS_DHE_RSA_WITH_AES_256_GCM_SHA384", TLS_DHE_RSA_WITH_AES_256_GCM_SHA384},
+	{"TLS_DHE_DSS_WITH_AES_128_GCM_SHA256", TLS_DHE_DSS_WITH_AES_128_GCM_SHA256},
+	{"TLS_DHE_DSS_WITH_AES_256_GCM_SHA384", TLS_DHE_DSS_WITH_AES_256_GCM_SHA384},
+
+	{"TLS_AES_128_GCM_SHA256", TLS_AES_128_GCM_SHA256},
+	{"TLS_AES_256_GCM_SHA384", TLS_AES_256_GCM_SHA384},
+	{"TLS_CHACHA20_POLY1305_SHA256", TLS_CHACHA20_POLY1305_SHA256},
+	{NULL, 0}
+};
+
+/*
+ * pg_find_cipher
+ *			Translate an NSS ciphername to the cipher code
+ *
+ * Searches the configured ciphers for the corresponding cipher code to the
+ * name. Search is performed case insensitive.
+ */
+PRUint16
+pg_find_cipher(char *name)
+{
+	const		NSSCiphers *cipher_list = NSS_CipherList;
+
+	while (cipher_list->name)
+	{
+		if (pg_strcasecmp(cipher_list->name, name) == 0)
+			return cipher_list->number;
+
+		cipher_list++;
+	}
+
+	return 0xFFFF;
+}
+
+#endif							/* USE_NSS */
+
+#endif							/* PG_NSS_H */
diff --git a/src/include/libpq/libpq-be.h b/src/include/libpq/libpq-be.h
index 0a23281ad5..b68ef64ec9 100644
--- a/src/include/libpq/libpq-be.h
+++ b/src/include/libpq/libpq-be.h
@@ -192,13 +192,18 @@ typedef struct Port
 	bool		peer_cert_valid;
 
 	/*
-	 * OpenSSL structures. (Keep these last so that the locations of other
-	 * fields are the same whether or not you build with OpenSSL.)
+	 * SSL backend specific structures. (Keep these last so that the locations
+	 * of other fields are the same whether or not you build with SSL
+	 * enabled.)
 	 */
 #ifdef USE_OPENSSL
 	SSL		   *ssl;
 	X509	   *peer;
 #endif
+
+#ifdef USE_NSS
+	void	   *pr_fd;
+#endif
 } Port;
 
 #ifdef USE_SSL
@@ -292,6 +297,10 @@ extern char *be_tls_get_certificate_hash(Port *port, size_t *len);
 typedef void (*openssl_tls_init_hook_typ) (SSL_CTX *context, bool isServerStart);
 extern PGDLLIMPORT openssl_tls_init_hook_typ openssl_tls_init_hook;
 #endif
+#ifdef USE_NSS
+typedef void (*nss_tls_init_hook_type) (bool isServerStart);
+extern PGDLLIMPORT nss_tls_init_hook_type nss_tls_init_hook;
+#endif
 
 #endif							/* USE_SSL */
 
diff --git a/src/include/libpq/libpq.h b/src/include/libpq/libpq.h
index b1152475ac..298d87ecae 100644
--- a/src/include/libpq/libpq.h
+++ b/src/include/libpq/libpq.h
@@ -88,6 +88,9 @@ extern PGDLLIMPORT bool ssl_passphrase_command_supports_reload;
 #ifdef USE_SSL
 extern bool ssl_loaded_verify_locations;
 #endif
+#ifdef USE_NSS
+extern char *ssl_database;
+#endif
 
 extern int	secure_initialize(bool isServerStart);
 extern bool secure_loaded_verify_locations(void);
diff --git a/src/include/pg_config.h.in b/src/include/pg_config.h.in
index fb270df678..73c39b449c 100644
--- a/src/include/pg_config.h.in
+++ b/src/include/pg_config.h.in
@@ -893,6 +893,12 @@
 /* Define to 1 to build with PAM support. (--with-pam) */
 #undef USE_PAM
 
+/* Define to build with NSS support (--with-nss) */
+#undef USE_NSS
+
+/* Define to use NSS for random number generation */
+#undef USE_NSS_RANDOM
+
 /* Define to 1 to use software CRC-32C implementation (slicing-by-8). */
 #undef USE_SLICING_BY_8_CRC32C
 
diff --git a/src/include/pg_config_manual.h b/src/include/pg_config_manual.h
index 705dc69c06..c28b84126d 100644
--- a/src/include/pg_config_manual.h
+++ b/src/include/pg_config_manual.h
@@ -176,10 +176,9 @@
 
 /*
  * USE_SSL code should be compiled only when compiling with an SSL
- * implementation.  (Currently, only OpenSSL is supported, but we might add
- * more implementations in the future.)
+ * implementation.
  */
-#ifdef USE_OPENSSL
+#if defined(USE_OPENSSL) || defined(USE_NSS)
 #define USE_SSL
 #endif
 
diff --git a/src/interfaces/libpq/Makefile b/src/interfaces/libpq/Makefile
index 4ac5f4b340..ef5f105afc 100644
--- a/src/interfaces/libpq/Makefile
+++ b/src/interfaces/libpq/Makefile
@@ -57,6 +57,10 @@ OBJS += \
 	fe-secure-gssapi.o
 endif
 
+ifeq ($(with_nss), yes)
+OBJS += fe-secure-nss.o
+endif
+
 ifeq ($(PORTNAME), cygwin)
 override shlib = cyg$(NAME)$(DLSUFFIX)
 endif
diff --git a/src/interfaces/libpq/fe-connect.c b/src/interfaces/libpq/fe-connect.c
index b0ca37c2ed..a15a89c50c 100644
--- a/src/interfaces/libpq/fe-connect.c
+++ b/src/interfaces/libpq/fe-connect.c
@@ -355,6 +355,10 @@ static const internalPQconninfoOption PQconninfoOptions[] = {
 		"Target-Session-Attrs", "", 11, /* sizeof("read-write") = 11 */
 	offsetof(struct pg_conn, target_session_attrs)},
 
+	{"cert_database", NULL, NULL, NULL,
+		"CertificateDatabase", "", 64,
+	offsetof(struct pg_conn, cert_database)},
+
 	/* Terminating entry --- MUST BE LAST */
 	{NULL, NULL, NULL, NULL,
 	NULL, NULL, 0}
diff --git a/src/interfaces/libpq/fe-secure-nss.c b/src/interfaces/libpq/fe-secure-nss.c
new file mode 100644
index 0000000000..dbc7e03697
--- /dev/null
+++ b/src/interfaces/libpq/fe-secure-nss.c
@@ -0,0 +1,984 @@
+/*-------------------------------------------------------------------------
+ *
+ * fe-secure-nss.c
+ *	  functions for supporting NSS as a TLS backend for frontend libpq
+ *
+ * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ *	  src/interfaces/libpq/fe-secure-nss.c
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#include "postgres_fe.h"
+
+#include "libpq-fe.h"
+#include "fe-auth.h"
+#include "libpq-int.h"
+
+/*
+ * BITS_PER_BYTE is also defined in the NSPR header files, so we need to undef
+ * our version to avoid compiler warnings on redefinition.
+ */
+#define pg_BITS_PER_BYTE BITS_PER_BYTE
+#undef BITS_PER_BYTE
+
+/*
+ * The nspr/obsolete/protypes.h NSPR header typedefs uint64 and int64 with
+ * colliding definitions from ours, causing a much expected compiler error.
+ * The definitions are however not actually used in NSPR at all, and are only
+ * intended for what seems to be backwards compatibility for apps written
+ * against old versions of NSPR.  The following comment is in the referenced
+ * file, and was added in 1998:
+ *
+ *		This section typedefs the old 'native' types to the new PR<type>s.
+ *		These definitions are scheduled to be eliminated at the earliest
+ *		possible time. The NSPR API is implemented and documented using
+ *		the new definitions.
+ *
+ * As there is no opt-out from pulling in these typedefs, we define the guard
+ * for the file to exclude it. This is incredibly ugly, but seems to be about
+ * the only way around it.
+ */
+#define PROTYPES_H
+#include <nspr.h>
+#undef PROTYPES_H
+#include <nss.h>
+#include <ssl.h>
+#include <sslproto.h>
+#include <pk11func.h>
+#include <prerror.h>
+#include <prinit.h>
+#include <prio.h>
+#include <secerr.h>
+#include <secmod.h>
+
+/*
+ * Ensure that the colliding definitions match, else throw an error. In case
+ * NSPR remove the definition in a future version (however unlikely that may
+ * be, make sure to put ours back again.
+ */
+#if defined(BITS_PER_BYTE)
+#if BITS_PER_BYTE != pg_BITS_PER_BYTE
+#error "incompatible byte widths between NSPR and PostgreSQL"
+#endif
+#else
+#define BITS_PER_BYTE pg_BITS_PER_BYTE
+#endif
+#undef pg_BITS_PER_BYTE
+
+static SECStatus pg_load_nss_module(SECMODModule * *module, const char *library, const char *name);
+static SECStatus pg_bad_cert_handler(void *arg, PRFileDesc * fd);
+static char *pg_SSLerrmessage(PRErrorCode errcode);
+static SECStatus pg_client_auth_handler(void *arg, PRFileDesc * socket, CERTDistNames * caNames,
+										CERTCertificate * *pRetCert, SECKEYPrivateKey * *pRetKey);
+static SECStatus pg_cert_auth_handler(void *arg, PRFileDesc * fd, PRBool checksig, PRBool isServer);
+static int	ssl_protocol_version_to_nss(const char *protocol);
+static bool cert_database_has_CA(PGconn *conn);
+
+static char *PQssl_passwd_cb(PK11SlotInfo * slot, PRBool retry, void *arg);
+
+/*
+ * PR_ImportTCPSocket() is a private API, but very widely used, as it's the
+ * only way to make NSS use an already set up POSIX file descriptor rather
+ * than opening one itself. To quote the NSS documentation:
+ *
+ *		"In theory, code that uses PR_ImportTCPSocket may break when NSPR's
+ *		implementation changes. In practice, this is unlikely to happen because
+ *		NSPR's implementation has been stable for years and because of NSPR's
+ *		strong commitment to backward compatibility."
+ *
+ * https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSPR/Reference/PR_ImportTCPSocket
+ *
+ * The function is declared in <private/pprio.h>, but as it is a header marked
+ * private we declare it here rather than including it.
+ */
+NSPR_API(PRFileDesc *) PR_ImportTCPSocket(int);
+
+static SECMODModule * ca_trust = NULL;
+static NSSInitContext * nss_context = NULL;
+
+/*
+ * Track whether the NSS database has a password set or not. There is no API
+ * function for retrieving password status, so we simply flip this to true in
+ * case NSS invoked the password callback - as that will only happen in case
+ * there is a password. The reason for tracking this is that there are calls
+ * which require a password parameter, but doesn't use the callbacks provided,
+ * so we must call the callback on behalf of these.
+ */
+static bool has_password = false;
+
+#if defined(WIN32)
+static const char *ca_trust_name = "nssckbi.dll";
+#elif defined(__darwin__)
+static const char *ca_trust_name = "libnssckbi.dylib";
+#else
+static const char *ca_trust_name = "libnssckbi.so";
+#endif
+
+static PQsslKeyPassHook_nss_type PQsslKeyPassHook = NULL;
+
+/* ------------------------------------------------------------ */
+/*			 Procedures common to all secure sessions			*/
+/* ------------------------------------------------------------ */
+
+/*
+ * pgtls_init_library
+ *
+ * There is no direct equivalent for PQinitOpenSSL in NSS/NSPR, with PR_Init
+ * being the closest match there is. PR_Init is however already documented to
+ * not be required so simply making this a noop seems like the best option.
+ */
+void
+pgtls_init_library(bool do_ssl, int do_crypto)
+{
+	/* noop */
+}
+
+int
+pgtls_init(PGconn *conn)
+{
+	conn->ssl_in_use = false;
+
+	return 0;
+}
+
+void
+pgtls_close(PGconn *conn)
+{
+	if (nss_context)
+	{
+		NSS_ShutdownContext(nss_context);
+		nss_context = NULL;
+	}
+}
+
+PostgresPollingStatusType
+pgtls_open_client(PGconn *conn)
+{
+	SECStatus	status;
+	PRFileDesc *pr_fd;
+	PRFileDesc *model;
+	NSSInitParameters params;
+	SSLVersionRange desired_range;
+
+	/*
+	 * The NSPR documentation states that runtime initialization via PR_Init
+	 * is no longer required, as the first caller into NSPR will perform the
+	 * initialization implicitly. The documentation doesn't however clarify
+	 * from which version this is holds true, so let's perform the potentially
+	 * superfluous initialization anyways to avoid crashing on older versions
+	 * of NSPR, as there is no difference in overhead.  The NSS documentation
+	 * still states that PR_Init must be called in some way (implicitly or
+	 * explicitly).
+	 *
+	 * The below parameters are what the implicit initialization would've done
+	 * for us, and should work even for older versions where it might not be
+	 * done automatically. The last parameter, maxPTDs, is set to various
+	 * values in other codebases, but has been unused since NSPR 2.1 which was
+	 * released sometime in 1998.
+	 */
+	PR_Init(PR_USER_THREAD, PR_PRIORITY_NORMAL, 0);
+
+	/*
+	 * The original design of NSS was for a single application to use a single
+	 * copy of it, initialized with NSS_Initialize() which isn't returning any
+	 * handle with which to refer to NSS. NSS initialization and shutdown are
+	 * global for the application, so a shutdown in another NSS enabled
+	 * library would cause NSS to be stopped for libpq as well.  The fix has
+	 * been to introduce NSS_InitContext which returns a context handle to
+	 * pass to NSS_ShutdownContext.  NSS_InitContext was introduced in NSS
+	 * 3.12, but the use of it is not very well documented.
+	 * https://bugzilla.redhat.com/show_bug.cgi?id=738456
+	 *
+	 * The InitParameters struct passed can be used to override internal
+	 * values in NSS, but the usage is not documented at all. When using
+	 * NSS_Init initializations, the values are instead set via PK11_Configure
+	 * calls so the PK11_Configure documentation can be used to glean some
+	 * details on these.
+	 *
+	 * https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS/PKCS11/Module_Specs
+	 */
+	memset(&params, 0, sizeof(params));
+	params.length = sizeof(params);
+
+	if (conn->cert_database && strlen(conn->cert_database) > 0)
+	{
+		char	   *cert_database_path = psprintf("sql:%s", conn->cert_database);
+
+		nss_context = NSS_InitContext(cert_database_path, "", "", "",
+									  &params,
+									  NSS_INIT_READONLY | NSS_INIT_PK11RELOAD);
+		pfree(cert_database_path);
+	}
+	else
+		nss_context = NSS_InitContext("", "", "", "", &params,
+									  NSS_INIT_READONLY | NSS_INIT_NOCERTDB |
+									  NSS_INIT_NOMODDB | NSS_INIT_FORCEOPEN |
+									  NSS_INIT_NOROOTINIT | NSS_INIT_PK11RELOAD);
+
+	if (!nss_context)
+	{
+		char	   *err = pg_SSLerrmessage(PR_GetError());
+
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to %s certificate database: %s"),
+						  conn->cert_database ? "open" : "create",
+						  err);
+		free(err);
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * Configure cipher policy.
+	 */
+	status = NSS_SetDomesticPolicy();
+	if (status != SECSuccess)
+	{
+		char	   *err = pg_SSLerrmessage(PR_GetError());
+
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to configure cipher policy: %s"),
+						  err);
+		free(err);
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * If we don't have a certificate database, the system trust store is the
+	 * fallback we can use. If we fail to initialize that as well, we can
+	 * still attempt a connection as long as the sslmode isn't verify*.
+	 */
+	if (!conn->cert_database && conn->sslmode[0] == 'v')
+	{
+		status = pg_load_nss_module(&ca_trust, ca_trust_name, "\"Root Certificates\"");
+		/* status = pg_load_nss_module(&ca_trust, ca_trust_name, "trust"); */
+		if (status != SECSuccess)
+		{
+			char	   *err = pg_SSLerrmessage(PR_GetError());
+
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("WARNING: unable to load NSS trust module \"%s\" : %s"), ca_trust_name, err);
+			return PGRES_POLLING_FAILED;
+		}
+	}
+
+
+	PK11_SetPasswordFunc(PQssl_passwd_cb);
+
+	/*
+	 * Import the already opened socket as we don't want to use NSPR functions
+	 * for opening the network socket due to how the PostgreSQL protocol works
+	 * with TLS connections. This function is not part of the NSPR public API,
+	 * see the comment at the top of the file for the rationale of still using
+	 * it.
+	 */
+	pr_fd = PR_ImportTCPSocket(conn->sock);
+	if (!pr_fd)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to attach to socket: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * Most of the documentation available, and implementations of, NSS/NSPR
+	 * use the PR_NewTCPSocket() function here, which has the drawback that it
+	 * can only create IPv4 sockets. Instead use PR_OpenTCPSocket() which
+	 * copes with IPv6 as well.
+	 */
+	model = SSL_ImportFD(NULL, PR_OpenTCPSocket(conn->laddr.addr.ss_family));
+	if (!model)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to enable TLS: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/* Disable old protocol versions (SSLv2 and SSLv3) */
+	SSL_OptionSet(model, SSL_ENABLE_SSL2, PR_FALSE);
+	SSL_OptionSet(model, SSL_V2_COMPATIBLE_HELLO, PR_FALSE);
+	SSL_OptionSet(model, SSL_ENABLE_SSL3, PR_FALSE);
+
+#ifdef SSL_CBC_RANDOM_IV
+
+	/*
+	 * Enable protection against the BEAST attack in case the NSS library has
+	 * support for that. While SSLv3 is disabled, we may still allow TLSv1
+	 * which is affected. The option isn't documented as an SSL option, but as
+	 * an NSS environment variable.
+	 */
+	SSL_OptionSet(model, SSL_CBC_RANDOM_IV, PR_TRUE);
+#endif
+
+	/* Set us up as a TLS client for the handshake */
+	SSL_OptionSet(model, SSL_HANDSHAKE_AS_CLIENT, PR_TRUE);
+
+	/*
+	 * When setting the available protocols, we either use the user defined
+	 * configuration values, and if missing we accept whatever is the highest
+	 * version supported by the library as the max and only limit the range in
+	 * the other end at TLSv1.0. ssl_variant_stream is a ProtocolVariant enum
+	 * for Stream protocols, rather than datagram.
+	 */
+	SSL_VersionRangeGetSupported(ssl_variant_stream, &desired_range);
+	desired_range.min = SSL_LIBRARY_VERSION_TLS_1_0;
+
+	if (conn->ssl_min_protocol_version && strlen(conn->ssl_min_protocol_version) > 0)
+	{
+		int			ssl_min_ver = ssl_protocol_version_to_nss(conn->ssl_min_protocol_version);
+
+		if (ssl_min_ver == -1)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("invalid value \"%s\" for minimum version of SSL protocol\n"),
+							  conn->ssl_min_protocol_version);
+			return -1;
+		}
+
+		desired_range.min = ssl_min_ver;
+	}
+
+	if (conn->ssl_max_protocol_version && strlen(conn->ssl_max_protocol_version) > 0)
+	{
+		int			ssl_max_ver = ssl_protocol_version_to_nss(conn->ssl_max_protocol_version);
+
+		if (ssl_max_ver == -1)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("invalid value \"%s\" for maximum version of SSL protocol\n"),
+							  conn->ssl_max_protocol_version);
+			return -1;
+		}
+
+		desired_range.max = ssl_max_ver;
+	}
+
+	if (SSL_VersionRangeSet(model, &desired_range) != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to set allowed SSL protocol version range: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * Set up callback for verifying server certificates, as well as for how
+	 * to handle failed verifications.
+	 */
+	SSL_AuthCertificateHook(model, pg_cert_auth_handler, (void *) conn);
+	SSL_BadCertHook(model, pg_bad_cert_handler, (void *) conn);
+
+	/*
+	 * Convert the NSPR socket to an SSL socket. Ensuring the success of this
+	 * operation is critical as NSS SSL_* functions may return SECSuccess on
+	 * the socket even though SSL hasn't been enabled, which introduce a risk
+	 * of silent downgrades.
+	 */
+	conn->pr_fd = SSL_ImportFD(model, pr_fd);
+	if (!conn->pr_fd)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to configure client for TLS: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * The model can now we closed as we've applied the settings of the model
+	 * onto the real socket. From hereon we should only use conn->pr_fd.
+	 */
+	PR_Close(model);
+
+	/* Set the private data to be passed to the password callback */
+	SSL_SetPKCS11PinArg(conn->pr_fd, (void *) conn);
+
+	/*
+	 * If a CRL file has been specified, verify if it exists in the database
+	 * but don't fail in case it doesn't.
+	 */
+	if (conn->sslcrl && strlen(conn->sslcrl) > 0)
+	{
+		/* XXX: Implement me.. */
+	}
+
+	status = SSL_ResetHandshake(conn->pr_fd, PR_FALSE);
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to initiate handshake: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * Set callback for client authentication when requested by the server.
+	 */
+	SSL_GetClientAuthDataHook(conn->pr_fd, pg_client_auth_handler, (void *) conn);
+
+	/*
+	 * Specify which hostname we are expecting to talk to. This is required,
+	 * albeit mostly applies to when opening a connection to a traditional
+	 * http server it seems.
+	 */
+	SSL_SetURL(conn->pr_fd, (conn->connhost[conn->whichhost]).host);
+
+	do
+	{
+		status = SSL_ForceHandshake(conn->pr_fd);
+	}
+	while (status != SECSuccess && PR_GetError() == PR_WOULD_BLOCK_ERROR);
+
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("SSL error: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	conn->ssl_in_use = true;
+	return PGRES_POLLING_OK;
+}
+
+ssize_t
+pgtls_read(PGconn *conn, void *ptr, size_t len)
+{
+	PRInt32		nread;
+	PRErrorCode status;
+	int			read_errno = 0;
+
+	nread = PR_Recv(conn->pr_fd, ptr, len, 0, PR_INTERVAL_NO_WAIT);
+
+	/*
+	 * PR_Recv blocks until there is data to read or the timeout expires. Zero
+	 * is returned for closed connections, while -1 indicates an error within
+	 * the ongoing connection.
+	 */
+	if (nread == 0)
+	{
+		read_errno = ECONNRESET;
+		return -1;
+	}
+
+	if (nread == -1)
+	{
+		status = PR_GetError();
+
+		switch (status)
+		{
+			case PR_WOULD_BLOCK_ERROR:
+				read_errno = EINTR;
+				break;
+
+			case PR_IO_TIMEOUT_ERROR:
+				break;
+
+				/*
+				 * The error cases for PR_Recv are not documented, but can be
+				 * reverse engineered from _MD_unix_map_default_error() in the
+				 * NSPR code, defined in pr/src/md/unix/unix_errors.c.
+				 */
+			default:
+				printfPQExpBuffer(&conn->errorMessage,
+								  libpq_gettext("TLS read error: %s"),
+								  pg_SSLerrmessage(status));
+				break;
+		}
+	}
+
+	SOCK_ERRNO_SET(read_errno);
+	return (ssize_t) nread;
+}
+
+/*
+ * pgtls_read_pending
+ *		Check for the existence of data to be read.
+ *
+ * This is part of the PostgreSQL TLS backend API.
+ */
+bool
+pgtls_read_pending(PGconn *conn)
+{
+	unsigned char c;
+	int			n;
+
+	/*
+	 * PR_Recv peeks into the stream with the timeount turned off, to see if
+	 * there is another byte to read off the wire. There is an NSS function
+	 * SSL_DataPending() which might seem like a better fit, but it will only
+	 * check already encrypted data in the SSL buffer, not still unencrypted
+	 * data, thus it doesn't guarantee that a subsequent call to
+	 * PR_Read/PR_Recv wont block.
+	 */
+	n = PR_Recv(conn->pr_fd, &c, 1, PR_MSG_PEEK, PR_INTERVAL_NO_WAIT);
+	return (n > 0);
+}
+
+ssize_t
+pgtls_write(PGconn *conn, const void *ptr, size_t len)
+{
+	PRInt32		n;
+	PRErrorCode status;
+	int			write_errno = 0;
+
+	n = PR_Write(conn->pr_fd, ptr, len);
+
+	if (n < 0)
+	{
+		status = PR_GetError();
+
+		switch (status)
+		{
+			case PR_WOULD_BLOCK_ERROR:
+#ifdef EAGAIN
+				write_errno = EAGAIN;
+#else
+				write_errno = EINTR;
+#endif
+				break;
+
+			default:
+				printfPQExpBuffer(&conn->errorMessage,
+								  libpq_gettext("TLS write error: %s"),
+								  pg_SSLerrmessage(status));
+				write_errno = ECONNRESET;
+				break;
+		}
+	}
+
+	SOCK_ERRNO_SET(write_errno);
+	return (ssize_t) n;
+}
+
+/*
+ *	Verify that the server certificate matches the hostname we connected to.
+ *
+ * The certificate's Common Name and Subject Alternative Names are considered.
+ */
+int
+pgtls_verify_peer_name_matches_certificate_guts(PGconn *conn,
+												int *names_examined,
+												char **first_name)
+{
+	return 1;
+}
+
+/* ------------------------------------------------------------ */
+/*			PostgreSQL specific TLS support functions			*/
+/* ------------------------------------------------------------ */
+
+/*
+ * TODO: this a 99% copy of the same function in the backend, make these share
+ * a single implementation instead.
+ */
+static char *
+pg_SSLerrmessage(PRErrorCode errcode)
+{
+	const char *error;
+
+	error = PR_ErrorToName(errcode);
+	if (error)
+		return strdup(error);
+
+	return strdup("unknown TLS error");
+}
+
+static SECStatus
+pg_load_nss_module(SECMODModule * *module, const char *library, const char *name)
+{
+	SECMODModule *mod;
+	char	   *modulespec;
+
+	modulespec = psprintf("library=\"%s\", name=\"%s\"", library, name);
+
+	/*
+	 * Attempt to load the specified module. The second parameter is "parent"
+	 * which should always be NULL for application code. The third parameter
+	 * defines if loading should recurse which is only applicable when loading
+	 * a module from within another module. This hierarchy would have to be
+	 * defined in the modulespec, and since we don't support anything but
+	 * directly addressed modules we should pass PR_FALSE.
+	 */
+	mod = SECMOD_LoadUserModule(modulespec, NULL, PR_FALSE);
+	pfree(modulespec);
+
+	if (mod && mod->loaded)
+	{
+		*module = mod;
+		return SECSuccess;
+	}
+
+	SECMOD_DestroyModule(mod);
+	return SECFailure;
+}
+
+/* ------------------------------------------------------------ */
+/*						NSS Callbacks							*/
+/* ------------------------------------------------------------ */
+
+/*
+ * pg_cert_auth_handler
+ *			Callback for authenticating server certificate
+ *
+ * This is pretty much the same procedure as the SSL_AuthCertificate function
+ * provided by NSS, with the difference being server hostname validation. With
+ * SSL_AuthCertificate there is no way to do verify-ca, it only does the -full
+ * flavor of our sslmodes, so we need our own implementation.
+ */
+static SECStatus
+pg_cert_auth_handler(void *arg, PRFileDesc * fd, PRBool checksig, PRBool isServer)
+{
+	SECStatus	status;
+	PGconn	   *conn = (PGconn *) arg;
+	char	   *server_hostname = NULL;
+	CERTCertificate *server_cert;
+	void	   *pin;
+
+	Assert(!isServer);
+
+	pin = SSL_RevealPinArg(conn->pr_fd);
+	server_cert = SSL_PeerCertificate(conn->pr_fd);
+
+	status = CERT_VerifyCertificateNow((CERTCertDBHandle *) CERT_GetDefaultCertDB(), server_cert,
+									   checksig, certificateUsageSSLServer,
+									   pin, NULL);
+
+	/*
+	 * If we've already failed validation then there is no point in also
+	 * performing the hostname check for verify-full.
+	 */
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to verify certificate: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		goto done;
+	}
+
+	if (strcmp(conn->sslmode, "verify-full") == 0)
+	{
+		server_hostname = SSL_RevealURL(conn->pr_fd);
+		if (!server_hostname || server_hostname[0] == '\0')
+			goto done;
+
+		/*
+		 * CERT_VerifyCertName will internally perform RFC 2818 SubjectAltName
+		 * verification.
+		 */
+		status = CERT_VerifyCertName(server_cert, server_hostname);
+		if (status != SECSuccess)
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("unable to verify server hostname: %s"),
+							  pg_SSLerrmessage(PR_GetError()));
+
+	}
+
+done:
+	if (server_hostname)
+		PR_Free(server_hostname);
+
+	CERT_DestroyCertificate(server_cert);
+	return status;
+}
+
+/*
+ * pg_client_auth_handler
+ *		Callback for client certificate validation
+ *
+ * The client auth callback is not on by default in NSS, so we need to invoke
+ * it ourselves to ensure we can do cert authentication. A TODO is to support
+ * running without a specified sslcert parameter. By retrieving all the certs
+ * via nickname from the cert database and see if we find one which apply with
+ * NSS_CmpCertChainWCANames() and PK11_FindKeyByAnyCert() we could support
+ * just running with a ssl database specified.
+ *
+ * For now, we use the default client certificate validation which requires a
+ * defined nickname to identify the cert in the database.
+ */
+static SECStatus
+pg_client_auth_handler(void *arg, PRFileDesc * socket, CERTDistNames * caNames,
+					   CERTCertificate * *pRetCert, SECKEYPrivateKey * *pRetKey)
+{
+	PGconn	   *conn = (PGconn *) arg;
+
+	return NSS_GetClientAuthData(conn->sslcert, socket, caNames, pRetCert, pRetKey);
+}
+
+/*
+ * pg_bad_cert_handler
+ *		Callback for failed certificate validation
+ *
+ * The TLS handshake will call this function iff the server certificate failed
+ * validation. Depending on the sslmode, we allow the connection anyways.
+ */
+static SECStatus
+pg_bad_cert_handler(void *arg, PRFileDesc * fd)
+{
+	PGconn	   *conn = (PGconn *) arg;
+	PRErrorCode err;
+
+	/*
+	 * This really shouldn't happen, as we've the the PGconn object as our
+	 * callback data, and at the callsite we know it will be populated. That
+	 * being said, the NSS code itself performs this check even when it should
+	 * not be required so let's use the same belts with our suspenders.
+	 */
+	if (!arg)
+		return SECFailure;
+
+	/*
+	 * For sslmodes other than verify-full and verify-ca we don't perform peer
+	 * validation, so return immediately.  sslmode require with a database
+	 * specified which contains a CA certificate will work like verify-ca to
+	 * be compatible with the OpenSSL implementation.
+	 */
+	if (strcmp(conn->sslmode, "require") == 0)
+	{
+		if (conn->cert_database && strlen(conn->cert_database) > 0 && cert_database_has_CA(conn))
+			return SECFailure;
+	}
+	if (conn->sslmode[0] == 'v')
+		return SECFailure;
+
+	err = PORT_GetError();
+
+	/*
+	 * TODO: these are relevant error codes that can occur in certificate
+	 * validation, figure out which we dont want for require/prefer etc.
+	 */
+	switch (err)
+	{
+		case SEC_ERROR_INVALID_AVA:
+		case SEC_ERROR_INVALID_TIME:
+		case SEC_ERROR_BAD_SIGNATURE:
+		case SEC_ERROR_EXPIRED_CERTIFICATE:
+		case SEC_ERROR_UNKNOWN_ISSUER:
+		case SEC_ERROR_UNTRUSTED_ISSUER:
+		case SEC_ERROR_UNTRUSTED_CERT:
+		case SEC_ERROR_CERT_VALID:
+		case SEC_ERROR_EXPIRED_ISSUER_CERTIFICATE:
+		case SEC_ERROR_CRL_EXPIRED:
+		case SEC_ERROR_CRL_BAD_SIGNATURE:
+		case SEC_ERROR_EXTENSION_VALUE_INVALID:
+		case SEC_ERROR_CA_CERT_INVALID:
+		case SEC_ERROR_CERT_USAGES_INVALID:
+		case SEC_ERROR_UNKNOWN_CRITICAL_EXTENSION:
+			return SECSuccess;
+			break;
+		default:
+			return SECFailure;
+			break;
+	}
+
+	/* Unreachable */
+	return SECSuccess;
+}
+
+/* ------------------------------------------------------------ */
+/*					SSL information functions					*/
+/* ------------------------------------------------------------ */
+
+/*
+ * PQgetssl
+ *
+ * Return NULL as this is legacy and defined to always be equal to calling
+ * PQsslStruct(conn, "OpenSSL"); This should ideally trigger a logged warning
+ * somewhere as it's nonsensical to run in a non-OpenSSL build, but the color
+ * of said bikeshed hasn't yet been determined.
+ */
+void *
+PQgetssl(PGconn *conn)
+{
+	return NULL;
+}
+
+void *
+PQsslStruct(PGconn *conn, const char *struct_name)
+{
+	if (!conn)
+		return NULL;
+
+	/*
+	 * Return the underlying PRFileDesc which can be used to access
+	 * information on the connection details. There is no SSL context per se.
+	 */
+	if (strcmp(struct_name, "NSS") == 0)
+		return conn->pr_fd;
+	return NULL;
+}
+
+const char *const *
+PQsslAttributeNames(PGconn *conn)
+{
+	static const char *const result[] = {
+		"library",
+		"cipher",
+		"protocol",
+		"key_bits",
+		"compression",
+		NULL
+	};
+
+	return result;
+}
+
+const char *
+PQsslAttribute(PGconn *conn, const char *attribute_name)
+{
+	SECStatus	status;
+	SSLChannelInfo channel;
+	SSLCipherSuiteInfo suite;
+
+	if (!conn || !conn->pr_fd)
+		return NULL;
+
+	if (strcmp(attribute_name, "library") == 0)
+		return "NSS";
+
+	status = SSL_GetChannelInfo(conn->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+		return NULL;
+
+	status = SSL_GetCipherSuiteInfo(channel.cipherSuite, &suite, sizeof(suite));
+	if (status != SECSuccess)
+		return NULL;
+
+	if (strcmp(attribute_name, "cipher") == 0)
+		return suite.cipherSuiteName;
+
+	if (strcmp(attribute_name, "key_bits") == 0)
+	{
+		static char key_bits_str[8];
+
+		snprintf(key_bits_str, sizeof(key_bits_str), "%i", suite.effectiveKeyBits);
+		return key_bits_str;
+	}
+
+	if (strcmp(attribute_name, "protocol") == 0)
+	{
+		switch (channel.protocolVersion)
+		{
+#ifdef SSL_LIBRARY_VERSION_TLS_1_3
+			case SSL_LIBRARY_VERSION_TLS_1_3:
+				return "TLSv1.3";
+#endif
+#ifdef SSL_LIBRARY_VERSION_TLS_1_2
+			case SSL_LIBRARY_VERSION_TLS_1_2:
+				return "TLSv1.2";
+#endif
+#ifdef SSL_LIBRARY_VERSION_TLS_1_1
+			case SSL_LIBRARY_VERSION_TLS_1_1:
+				return "TLSv1.1";
+#endif
+			case SSL_LIBRARY_VERSION_TLS_1_0:
+				return "TLSv1.0";
+			default:
+				return "unknown";
+		}
+	}
+
+	/*
+	 * NSS disabled support for compression in version 3.33, and it was only
+	 * available for SSLv3 at that point anyways, so we can safely return off
+	 * here without checking.
+	 */
+	if (strcmp(attribute_name, "compression") == 0)
+		return "off";
+
+	return NULL;
+}
+
+static int
+ssl_protocol_version_to_nss(const char *protocol)
+{
+	if (pg_strcasecmp("TLSv1", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_0;
+
+#ifdef SSL_LIBRARY_VERSION_TLS_1_1
+	if (pg_strcasecmp("TLSv1.1", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_1;
+#endif
+
+#ifdef SSL_LIBRARY_VERSION_TLS_1_2
+	if (pg_strcasecmp("TLSv1.2", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_2;
+#endif
+
+#ifdef SSL_LIBRARY_VERSION_TLS_1_3
+	if (pg_strcasecmp("TLSv1.3", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_3;
+#endif
+
+	return -1;
+}
+
+static bool
+cert_database_has_CA(PGconn *conn)
+{
+	CERTCertList *certificates;
+	bool		hasCA;
+
+	/*
+	 * If the certificate database has a password we must provide it, since
+	 * this API doesn't invoke the standard password callback.
+	 */
+	if (has_password)
+		certificates = PK11_ListCerts(PK11CertListCA, PQssl_passwd_cb(NULL, PR_FALSE, (void *) conn));
+	else
+		certificates = PK11_ListCerts(PK11CertListCA, NULL);
+	hasCA = !CERT_LIST_EMPTY(certificates);
+	CERT_DestroyCertList(certificates);
+
+	return hasCA;
+}
+
+PQsslKeyPassHook_nss_type
+PQgetSSLKeyPassHook_nss(void)
+{
+	return PQsslKeyPassHook;
+}
+
+void
+PQsetSSLKeyPassHook_nss(PQsslKeyPassHook_nss_type hook)
+{
+	PQsslKeyPassHook = hook;
+}
+
+/*
+ * Supply a password to decrypt a client certificate.
+ *
+ * This must match NSS type PK11PasswordFunc.
+ */
+static char *
+PQssl_passwd_cb(PK11SlotInfo * slot, PRBool retry, void *arg)
+{
+	has_password = true;
+
+	if (PQsslKeyPassHook)
+		return PQsslKeyPassHook(slot, (PRBool) retry, arg);
+	else
+		return PQdefaultSSLKeyPassHook_nss(slot, retry, arg);
+}
+
+/*
+ * The default password handler callback.
+ */
+char *
+PQdefaultSSLKeyPassHook_nss(PK11SlotInfo * slot, PRBool retry, void *arg)
+{
+	PGconn	   *conn = (PGconn *) arg;
+
+	/*
+	 * If the password didn't work the first time there is no point in
+	 * retrying as it hasn't changed.
+	 */
+	if (retry != PR_TRUE && conn->sslpassword && strlen(conn->sslpassword) > 0)
+		return PORT_Strdup(conn->sslpassword);
+
+	return NULL;
+}
diff --git a/src/interfaces/libpq/fe-secure.c b/src/interfaces/libpq/fe-secure.c
index 97c3805303..dd6ee15c5a 100644
--- a/src/interfaces/libpq/fe-secure.c
+++ b/src/interfaces/libpq/fe-secure.c
@@ -427,6 +427,9 @@ PQsslAttributeNames(PGconn *conn)
 
 	return result;
 }
+#endif /* USE_SSL */
+
+#ifndef USE_OPENSSL
 
 PQsslKeyPassHook_OpenSSL_type
 PQgetSSLKeyPassHook_OpenSSL(void)
@@ -445,7 +448,7 @@ PQdefaultSSLKeyPassHook_OpenSSL(char *buf, int size, PGconn *conn)
 {
 	return 0;
 }
-#endif							/* USE_SSL */
+#endif							/* USE_OPENSSL */
 
 /* Dummy version of GSSAPI information functions, when built without GSS support */
 #ifndef ENABLE_GSS
diff --git a/src/interfaces/libpq/libpq-fe.h b/src/interfaces/libpq/libpq-fe.h
index 3b6a9fbce3..27c16e187f 100644
--- a/src/interfaces/libpq/libpq-fe.h
+++ b/src/interfaces/libpq/libpq-fe.h
@@ -625,6 +625,17 @@ extern PQsslKeyPassHook_OpenSSL_type PQgetSSLKeyPassHook_OpenSSL(void);
 extern void PQsetSSLKeyPassHook_OpenSSL(PQsslKeyPassHook_OpenSSL_type hook);
 extern int	PQdefaultSSLKeyPassHook_OpenSSL(char *buf, int size, PGconn *conn);
 
+/* == in fe-secure-nss.c === */
+typedef struct PK11SlotInfoStr PK11SlotInfo;
+typedef int PRIntn;
+typedef PRIntn PRBool;
+
+/* Support for overriding sslpassword handling with a callback. */
+typedef char *(*PQsslKeyPassHook_nss_type) (PK11SlotInfo * slot, PRBool retry, void *arg);
+extern PQsslKeyPassHook_nss_type PQgetSSLKeyPassHook_nss(void);
+extern void PQsetSSLKeyPassHook_nss(PQsslKeyPassHook_nss_type hook);
+extern char *PQdefaultSSLKeyPassHook_nss(PK11SlotInfo * slot, PRBool retry, void *arg);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/src/interfaces/libpq/libpq-int.h b/src/interfaces/libpq/libpq-int.h
index 1de91ae295..12717ca720 100644
--- a/src/interfaces/libpq/libpq-int.h
+++ b/src/interfaces/libpq/libpq-int.h
@@ -362,6 +362,7 @@ struct pg_conn
 	char	   *sslpassword;	/* client key file password */
 	char	   *sslrootcert;	/* root certificate filename */
 	char	   *sslcrl;			/* certificate revocation list filename */
+	char	   *cert_database;
 	char	   *requirepeer;	/* required peer credentials for local sockets */
 	char	   *gssencmode;		/* GSS mode (require,prefer,disable) */
 	char	   *krbsrvname;		/* Kerberos service name */
@@ -485,6 +486,10 @@ struct pg_conn
 								 * OpenSSL version changes */
 #endif
 #endif							/* USE_OPENSSL */
+
+#ifdef USE_NSS
+	void	   *pr_fd;
+#endif							/* USE_NSS */
 #endif							/* USE_SSL */
 
 #ifdef ENABLE_GSS
diff --git a/src/port/pg_strong_random.c b/src/port/pg_strong_random.c
index 14e8382cd8..bac541078a 100644
--- a/src/port/pg_strong_random.c
+++ b/src/port/pg_strong_random.c
@@ -30,6 +30,20 @@
 #ifdef USE_WIN32_RANDOM
 #include <wincrypt.h>
 #endif
+#ifdef USE_NSS_RANDOM
+#define pg_BITS_PER_BYTE BITS_PER_BYTE
+#undef BITS_PER_BYTE
+#include <nss.h>
+#include <pk11pub.h>
+#if defined(BITS_PER_BYTE)
+#if BITS_PER_BYTE != pg_BITS_PER_BYTE
+#error "incompatible byte widths between NSPR and postgres"
+#endif
+#else
+#define BITS_PER_BYTE pg_BITS_PER_BYTE
+#endif
+#undef pg_BITS_PER_BYTE
+#endif
 
 #ifdef USE_WIN32_RANDOM
 /*
@@ -158,6 +172,29 @@ pg_strong_random(void *buf, size_t len)
 	}
 	return false;
 
+#elif defined(USE_NSS_RANDOM)
+	NSSInitParameters params;
+	NSSInitContext *nss_context;
+	SECStatus status;
+
+	memset(&params, 0, sizeof(params));
+	params.length = sizeof(params);
+	nss_context = NSS_InitContext("", "", "", "", &params,
+							  NSS_INIT_READONLY | NSS_INIT_NOCERTDB |
+							  NSS_INIT_NOMODDB | NSS_INIT_FORCEOPEN |
+							  NSS_INIT_NOROOTINIT | NSS_INIT_PK11RELOAD);
+
+	if (!nss_context)
+		return false;
+
+	status = PK11_GenerateRandom(buf, len);
+	NSS_ShutdownContext(nss_context);
+
+	if (status == SECSuccess)
+		return true;
+
+	return false;
+
 	/*
 	 * Read /dev/urandom ourselves.
 	 */
diff --git a/src/test/Makefile b/src/test/Makefile
index efb206aa75..d18f5a083b 100644
--- a/src/test/Makefile
+++ b/src/test/Makefile
@@ -27,7 +27,7 @@ ifneq (,$(filter ldap,$(PG_TEST_EXTRA)))
 SUBDIRS += ldap
 endif
 endif
-ifeq ($(with_openssl),yes)
+ifeq ($(with_ssl),yes)
 ifneq (,$(filter ssl,$(PG_TEST_EXTRA)))
 SUBDIRS += ssl
 endif
diff --git a/src/test/ssl/Makefile b/src/test/ssl/Makefile
index 777ee39413..4af971ef77 100644
--- a/src/test/ssl/Makefile
+++ b/src/test/ssl/Makefile
@@ -14,6 +14,7 @@ top_builddir = ../../..
 include $(top_builddir)/src/Makefile.global
 
 export with_openssl
+export with_nss
 
 CERTIFICATES := server_ca server-cn-and-alt-names \
 	server-cn-only server-single-alt-name server-multiple-alt-names \
@@ -30,6 +31,32 @@ SSLFILES := $(CERTIFICATES:%=ssl/%.key) $(CERTIFICATES:%=ssl/%.crt) \
 	ssl/client+client_ca.crt ssl/client-der.key \
 	ssl/client-encrypted-pem.key ssl/client-encrypted-der.key
 
+# Even though we in practice could get away with far fewer NSS databases, they
+# are generated to mimick the setup for the OpenSSL tests in order to ensure
+# we isolate the same behavior between the backends. The database name should
+# contain the files included for easier test suite code reading.
+NSSFILES := ssl/nss/client_ca.crt.db \
+	ssl/nss/server_ca.crt.db \
+	ssl/nss/root+server_ca.crt.db \
+	ssl/nss/root+client_ca.crt.db \
+	ssl/nss/client.crt__client.key.db \
+	ssl/nss/client-revoked.crt__client-revoked.key.db \
+	ssl/nss/server-cn-only.crt__server-password.key.db \
+	ssl/nss/server-cn-only.crt__server-cn-only.key.db \
+	ssl/nss/root.crl \
+	ssl/nss/server.crl \
+	ssl/nss/client.crl \
+	ssl/nss/server-multiple-alt-names.crt__server-multiple-alt-names.key.db \
+	ssl/nss/server-single-alt-name.crt__server-single-alt-name.key.db \
+	ssl/nss/server-cn-and-alt-names.crt__server-cn-and-alt-names.key.db \
+	ssl/nss/server-no-names.crt__server-no-names.key.db \
+	ssl/nss/server-revoked.crt__server-revoked.key.db \
+	ssl/nss/root+client.crl \
+	ssl/nss/client+client_ca.crt__client.key.db \
+	ssl/nss/client.crt__client-encrypted-pem.key.db \
+	ssl/nss/root+server_ca.crt__server.crl.db \
+	ssl/nss/root+server_ca.crt__root+server.crl.db
+
 # This target re-generates all the key and certificate files. Usually we just
 # use the ones that are committed to the tree without rebuilding them.
 #
@@ -37,6 +64,10 @@ SSLFILES := $(CERTIFICATES:%=ssl/%.key) $(CERTIFICATES:%=ssl/%.crt) \
 #
 sslfiles: $(SSLFILES)
 
+# Generate NSS certificate databases corresponding to the OpenSSL certificates.
+# This target will fail unless preceded by nssfiles-clean.
+nssfiles: $(NSSFILES)
+
 # OpenSSL requires a directory to put all generated certificates in. We don't
 # use this for anything, but we need a location.
 ssl/new_certs_dir:
@@ -64,6 +95,24 @@ ssl/%_ca.crt: ssl/%_ca.key %_ca.config ssl/root_ca.crt ssl/new_certs_dir
 	rm ssl/temp_ca.crt ssl/temp_ca_signed.crt
 	echo "01" > ssl/$*_ca.srl
 
+ssl/nss/%_ca.crt.db: ssl/%_ca.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n $*_ca.crt -i ssl/$*_ca.crt -t "CT,C,C"
+
+ssl/nss/root+server_ca.crt__server.crl.db: ssl/root+server_ca.crt ssl/nss/server.crl
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	crlutil -I -i ssl/nss/server.crl -d $@ -B
+
+ssl/nss/root+server_ca.crt__root+server.crl.db: ssl/root+server_ca.crt ssl/nss/root.crl ssl/nss/server.crl
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	crlutil -I -i ssl/nss/root.crl -d $@ -B
+	crlutil -I -i ssl/nss/server.crl -d $@ -B
+
 # Server certificates, signed by server CA:
 ssl/server-%.crt: ssl/server-%.key ssl/server_ca.crt server-%.config
 	openssl req -new -key ssl/server-$*.key -out ssl/server-$*.csr -config server-$*.config
@@ -77,6 +126,78 @@ ssl/server-ss.crt: ssl/server-cn-only.key ssl/server-cn-only.crt server-cn-only.
 	openssl x509 -req -days 10000 -in ssl/server-ss.csr -signkey ssl/server-cn-only.key -out ssl/server-ss.crt  -extensions v3_req -extfile server-cn-only.config
 	rm ssl/server-ss.csr
 
+# pk12util won't preserve the password when importing the password protected
+# key, the password must be set on the database *before* importing it as the
+# password in the pkcs12 envelope will be dropped.
+ssl/nss/server-cn-only.crt__server-password.key.db: ssl/server-cn-only.crt
+	$(MKDIR_P) $@
+	echo "secret1" > password.txt
+	certutil -d "sql:$@" -N -f password.txt
+	certutil -d "sql:$@" -A -n ssl/server-cn-only.crt -i ssl/server-cn-only.crt -t "CT,C,C" -f password.txt
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C" -f password.txt
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C" -f password.txt
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C" -f password.txt
+	openssl pkcs12 -export -out ssl/nss/server-password.pfx -inkey ssl/server-password.key -in ssl/server-cn-only.crt -certfile ssl/server_ca.crt -passin 'pass:secret1' -passout 'pass:secret1'
+	pk12util -i ssl/nss/server-password.pfx -d $@ -W 'secret1' -K 'secret1'
+
+ssl/nss/server-cn-only.crt__server-cn-only.key.db: ssl/server-cn-only.crt ssl/server-cn-only.key
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-cn-only.crt -i ssl/server-cn-only.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-cn-only.pfx -inkey ssl/server-cn-only.key -in ssl/server-cn-only.crt -certfile ssl/server_ca.crt -passout pass:
+	pk12util -i ssl/nss/server-cn-only.pfx -d $@ -W ''
+
+ssl/nss/server-multiple-alt-names.crt__server-multiple-alt-names.key.db: ssl/server-multiple-alt-names.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-multiple-alt-names.crt -i ssl/server-multiple-alt-names.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-multiple-alt-names.pfx -inkey ssl/server-multiple-alt-names.key -in ssl/server-multiple-alt-names.crt -certfile ssl/server-multiple-alt-names.crt -passout pass:
+	pk12util -i ssl/nss/server-multiple-alt-names.pfx -d $@ -W ''
+
+ssl/nss/server-single-alt-name.crt__server-single-alt-name.key.db: ssl/server-single-alt-name.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-single-alt-name.crt -i ssl/server-single-alt-name.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-single-alt-name.pfx -inkey ssl/server-single-alt-name.key -in ssl/server-single-alt-name.crt -certfile ssl/server-single-alt-name.crt -passout pass:
+	pk12util -i ssl/nss/server-single-alt-name.pfx -d $@ -W ''
+
+ssl/nss/server-cn-and-alt-names.crt__server-cn-and-alt-names.key.db: ssl/server-cn-and-alt-names.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-cn-and-alt-names.crt -i ssl/server-cn-and-alt-names.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-cn-and-alt-names.pfx -inkey ssl/server-cn-and-alt-names.key -in ssl/server-cn-and-alt-names.crt -certfile ssl/server-cn-and-alt-names.crt -passout pass:
+	pk12util -i ssl/nss/server-cn-and-alt-names.pfx -d $@ -W ''
+
+ssl/nss/server-no-names.crt__server-no-names.key.db: ssl/server-no-names.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-no-names.crt -i ssl/server-no-names.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-no-names.pfx -inkey ssl/server-no-names.key -in ssl/server-no-names.crt -certfile ssl/server-no-names.crt -passout pass:
+	pk12util -i ssl/nss/server-no-names.pfx -d $@ -W ''
+
+ssl/nss/server-revoked.crt__server-revoked.key.db: ssl/server-revoked.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-revoked.crt -i ssl/server-revoked.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-revoked.pfx -inkey ssl/server-revoked.key -in ssl/server-revoked.crt -certfile ssl/server-revoked.crt -passout pass:
+	pk12util -i ssl/nss/server-revoked.pfx -d $@ -W ''
+
 # Password-protected version of server-cn-only.key
 ssl/server-password.key: ssl/server-cn-only.key
 	openssl rsa -aes256 -in $< -out $@ -passout 'pass:secret1'
@@ -88,6 +209,27 @@ ssl/client.crt: ssl/client.key ssl/client_ca.crt
 	openssl x509 -in ssl/temp.crt -out ssl/client.crt # to keep just the PEM cert
 	rm ssl/client.csr ssl/temp.crt
 
+# Client certificate, signed by client CA
+ssl/nss/client.crt__client.key.db: ssl/client.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/client.crt -i ssl/client.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root+client_ca.crt -i ssl/root+client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client.pfx -inkey ssl/client.key -in ssl/client.crt -certfile ssl/client_ca.crt -passout pass:
+	pk12util -i ssl/nss/client.pfx -d $@ -W ''
+
+# Client certificate with encrypted key, signed by client CA
+ssl/nss/client.crt__client-encrypted-pem.key.db: ssl/client.crt
+	$(MKDIR_P) $@
+	echo 'dUmmyP^#+' > $@.pass
+	certutil -d "sql:$@" -N -f $@.pass
+	certutil -d "sql:$@" -A -f $@.pass -n ssl/client.crt -i ssl/client.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -f $@.pass -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -f $@.pass -n root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client-encrypted-pem.pfx -inkey ssl/client-encrypted-pem.key -in ssl/client.crt -certfile ssl/client_ca.crt -passin pass:'dUmmyP^#+' -passout pass:'dUmmyP^#+'
+	pk12util -i ssl/nss/client-encrypted-pem.pfx -d $@ -W 'dUmmyP^#+' -k $@.pass
+
 # Another client certificate, signed by the client CA. This one is revoked.
 ssl/client-revoked.crt: ssl/client-revoked.key ssl/client_ca.crt client.config
 	openssl req -new -key ssl/client-revoked.key -out ssl/client-revoked.csr -config client.config
@@ -95,6 +237,14 @@ ssl/client-revoked.crt: ssl/client-revoked.key ssl/client_ca.crt client.config
 	openssl x509 -in ssl/temp.crt -out ssl/client-revoked.crt # to keep just the PEM cert
 	rm ssl/client-revoked.csr ssl/temp.crt
 
+ssl/nss/client-revoked.crt__client-revoked.key.db: ssl/client-revoked.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/client-revoked.crt -i ssl/client-revoked.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client-revoked.pfx -inkey ssl/client-revoked.key -in ssl/client-revoked.crt -certfile ssl/client_ca.crt -passout pass:
+	pk12util -i ssl/nss/client-revoked.pfx -d $@ -W ''
+
 # Convert the key to DER, to test our behaviour there too
 ssl/client-der.key: ssl/client.key
 	openssl rsa -in ssl/client.key -outform DER -out ssl/client-der.key
@@ -127,19 +277,40 @@ ssl/root+client_ca.crt: ssl/root_ca.crt ssl/client_ca.crt
 ssl/client+client_ca.crt: ssl/client.crt ssl/client_ca.crt
 	cat $^ > $@
 
+# Client certificate, signed by client CA
+ssl/nss/client+client_ca.crt__client.key.db: ssl/client+client_ca.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/client+client_ca.crt -i ssl/client+client_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n ssl/root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client.pfx -inkey ssl/client.key -in ssl/client.crt -certfile ssl/client_ca.crt -passout pass:
+	pk12util -i ssl/nss/client.pfx -d $@ -W ''
+
 #### CRLs
 
 ssl/client.crl: ssl/client-revoked.crt
 	openssl ca -config cas.config -name client_ca -revoke ssl/client-revoked.crt
 	openssl ca -config cas.config -name client_ca -gencrl -out ssl/client.crl
 
+ssl/nss/client.crl: ssl/client.crl
+	openssl crl -in $^ -outform der -out $@
+
 ssl/server.crl: ssl/server-revoked.crt
 	openssl ca -config cas.config -name server_ca -revoke ssl/server-revoked.crt
 	openssl ca -config cas.config -name server_ca -gencrl -out ssl/server.crl
 
+ssl/nss/server.crl: ssl/server.crl
+	openssl crl -in $^ -outform der -out $@
+
 ssl/root.crl: ssl/root_ca.crt
 	openssl ca -config cas.config -name root_ca -gencrl -out ssl/root.crl
 
+ssl/nss/root.crl: ssl/root.crl
+	openssl crl -in $^ -outform der -out $@
+
+ssl/nss/root+client.crl: ssl/root+client.crl
+	openssl crl -in $^ -outform der -out $@
+
 # If a CRL is used, OpenSSL requires a CRL file for *all* the CAs in the
 # chain, even if some of them are empty.
 ssl/root+server.crl: ssl/root.crl ssl/server.crl
@@ -151,9 +322,14 @@ ssl/root+client.crl: ssl/root.crl ssl/client.crl
 sslfiles-clean:
 	rm -f $(SSLFILES) ssl/client_ca.srl ssl/server_ca.srl ssl/client_ca-certindex* ssl/server_ca-certindex* ssl/root_ca-certindex* ssl/root_ca.srl ssl/temp_ca.crt ssl/temp_ca_signed.crt
 
+.PHONY: nssfiles-clean
+nssfiles-clean:
+	rm -rf ssl/nss
+
 clean distclean maintainer-clean:
 	rm -rf tmp_check
 	rm -rf ssl/*.old ssl/new_certs_dir ssl/client*_tmp.key
+	rm -rf ssl/nss
 
 # Doesn't depend on $(SSLFILES) because we don't rebuild them by default
 check:
diff --git a/src/test/ssl/t/001_ssltests.pl b/src/test/ssl/t/001_ssltests.pl
index fd2727b568..ff9c8ae3f3 100644
--- a/src/test/ssl/t/001_ssltests.pl
+++ b/src/test/ssl/t/001_ssltests.pl
@@ -4,17 +4,24 @@ use PostgresNode;
 use TestLib;
 use Test::More;
 
-use File::Copy;
-
 use FindBin;
 use lib $FindBin::RealBin;
 
-use SSLServer;
+use SSL::Server;
+
+my $openssl;
+my $nss;
 
 if ($ENV{with_openssl} eq 'yes')
 {
+	$openssl = 1;
 	plan tests => 93;
 }
+elsif ($ENV{with_nss} eq 'yes')
+{
+	$nss = 1;
+	plan tests => 98;
+}
 else
 {
 	plan skip_all => 'SSL not supported by this build';
@@ -32,32 +39,6 @@ my $SERVERHOSTCIDR = '127.0.0.1/32';
 # Allocation of base connection string shared among multiple tests.
 my $common_connstr;
 
-# The client's private key must not be world-readable, so take a copy
-# of the key stored in the code tree and update its permissions.
-#
-# This changes ssl/client.key to ssl/client_tmp.key etc for the rest
-# of the tests.
-my @keys = (
-	"client",     "client-revoked",
-	"client-der", "client-encrypted-pem",
-	"client-encrypted-der");
-foreach my $key (@keys)
-{
-	copy("ssl/${key}.key", "ssl/${key}_tmp.key")
-	  or die
-	  "couldn't copy ssl/${key}.key to ssl/${key}_tmp.key for permissions change: $!";
-	chmod 0600, "ssl/${key}_tmp.key"
-	  or die "failed to change permissions on ssl/${key}_tmp.key: $!";
-}
-
-# Also make a copy of that explicitly world-readable.  We can't
-# necessarily rely on the file in the source tree having those
-# permissions.  Add it to @keys to include it in the final clean
-# up phase.
-copy("ssl/client.key", "ssl/client_wrongperms_tmp.key");
-chmod 0644, "ssl/client_wrongperms_tmp.key";
-push @keys, 'client_wrongperms';
-
 #### Set up the server.
 
 note "setting up data directory";
@@ -72,36 +53,65 @@ $node->start;
 
 # Run this before we lock down access below.
 my $result = $node->safe_psql('postgres', "SHOW ssl_library");
-is($result, 'OpenSSL', 'ssl_library parameter');
+is($result, SSL::Server::ssl_library(), 'ssl_library parameter');
 
 configure_test_server_for_ssl($node, $SERVERHOSTADDR, $SERVERHOSTCIDR,
 	'trust');
 
 note "testing password-protected keys";
 
-open my $sslconf, '>', $node->data_dir . "/sslconfig.conf";
-print $sslconf "ssl=on\n";
-print $sslconf "ssl_cert_file='server-cn-only.crt'\n";
-print $sslconf "ssl_key_file='server-password.key'\n";
-print $sslconf "ssl_passphrase_command='echo wrongpassword'\n";
-close $sslconf;
+# Since the passphrase callbacks operate at different stages in OpenSSL and
+# NSS we have two separate blocks for them.
+SKIP:
+{
+	skip "Certificate passphrases aren't checked on server restart in NSS", 2
+	  if ($nss);
+
+	set_server_cert($node, 'server-cn-only', 'root+client_ca',
+					   'server-password', 'echo wrongpassword');
+	command_fails(
+		[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
+		'restart fails with password-protected key file with wrong password');
+	$node->_update_pid(0);
+
+	set_server_cert($node, 'server-cn-only', 'root+client_ca',
+					'server-password', 'echo secret1');
+	command_ok(
+		[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
+		'restart succeeds with password-protected key file');
+	$node->_update_pid(1);
+}
 
-command_fails(
-	[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
-	'restart fails with password-protected key file with wrong password');
-$node->_update_pid(0);
+SKIP:
+{
+	skip "Certificate passphrases are checked on connection in NSS", 5
+	  if ($openssl);
 
-open $sslconf, '>', $node->data_dir . "/sslconfig.conf";
-print $sslconf "ssl=on\n";
-print $sslconf "ssl_cert_file='server-cn-only.crt'\n";
-print $sslconf "ssl_key_file='server-password.key'\n";
-print $sslconf "ssl_passphrase_command='echo secret1'\n";
-close $sslconf;
+	set_server_cert($node, 'server-cn-only', 'root+client_ca',
+					   'server-password', 'echo wrongpassword');
+	command_ok(
+		[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
+		'restart fails with password-protected key file with wrong password');
+	$node->_update_pid(1);
 
-command_ok(
-	[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
-	'restart succeeds with password-protected key file');
-$node->_update_pid(1);
+	test_connect_fails(
+		"user=ssltestuser dbname=trustdb sslcert=invalid hostaddr=$SERVERHOSTADDR host=common-name.pg-ssltest.test",
+		"sslrootcert=invalid sslmode=require",
+		qr/\QSSL error\E/,
+		"connect to server with incorrect key password configured");
+
+	set_server_cert($node, 'server-cn-only', 'root+client_ca',
+					   'server-password', 'echo secret1');
+	command_ok(
+		[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
+		'restart fails with password-protected key file with wrong password');
+	$node->_update_pid(1);
+
+	test_connect_ok(
+		"user=ssltestuser dbname=trustdb sslcert=invalid hostaddr=$SERVERHOSTADDR host=common-name.pg-ssltest.test",
+		"sslrootcert=invalid sslmode=require",
+		"connect to server with correct key password configured");
+}
 
 # Test compatibility of SSL protocols.
 # TLSv1.1 is lower than TLSv1.2, so it won't work.
@@ -149,82 +159,105 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"sslrootcert=invalid sslmode=verify-ca",
-	qr/root certificate file "invalid" does not exist/,
+	qr/root certificate file "invalid" does not exist|could not connect to server/,
 	"connect without server root cert sslmode=verify-ca");
 test_connect_fails(
 	$common_connstr,
 	"sslrootcert=invalid sslmode=verify-full",
-	qr/root certificate file "invalid" does not exist/,
+	qr/root certificate file "invalid" does not exist|could not connect to server/,
 	"connect without server root cert sslmode=verify-full");
 
 # Try with wrong root cert, should fail. (We're using the client CA as the
 # root, but the server's key is signed by the server CA.)
-test_connect_fails($common_connstr,
-	"sslrootcert=ssl/client_ca.crt sslmode=require",
-	qr/SSL error/, "connect with wrong server root cert sslmode=require");
-test_connect_fails($common_connstr,
-	"sslrootcert=ssl/client_ca.crt sslmode=verify-ca",
-	qr/SSL error/, "connect with wrong server root cert sslmode=verify-ca");
-test_connect_fails($common_connstr,
-	"sslrootcert=ssl/client_ca.crt sslmode=verify-full",
-	qr/SSL error/, "connect with wrong server root cert sslmode=verify-full");
-
-# Try with just the server CA's cert. This fails because the root file
-# must contain the whole chain up to the root CA.
-test_connect_fails($common_connstr,
-	"sslrootcert=ssl/server_ca.crt sslmode=verify-ca",
-	qr/SSL error/, "connect with server CA cert, without root CA");
+test_connect_fails(
+	$common_connstr,
+	"sslrootcert=ssl/client_ca.crt sslmode=require cert_database=ssl/nss/client_ca.crt.db",
+	qr/SSL error/,
+	"connect with wrong server root cert sslmode=require");
+test_connect_fails(
+	$common_connstr,
+	"sslrootcert=ssl/client_ca.crt sslmode=verify-ca cert_database=ssl/nss/client_ca.crt.db",
+	qr/SSL error/,
+	"connect with wrong server root cert sslmode=verify-ca");
+test_connect_fails(
+	$common_connstr,
+	"sslrootcert=ssl/client_ca.crt sslmode=verify-full cert_database=ssl/nss/client_ca.crt.db",
+	qr/SSL error/,
+	"connect with wrong server root cert sslmode=verify-full");
+
+SKIP:
+{
+	# NSS supports partial chain validation, so this test doesnt work there.
+	# This is similar to the OpenSSL option X509_V_FLAG_PARTIAL_CHAIN which
+	# we don't allow.
+	skip "NSS support partial chain validation", 2 if ($nss);
+	# Try with just the server CA's cert. This fails because the root file
+	# must contain the whole chain up to the root CA.
+	test_connect_fails($common_connstr,
+		"sslrootcert=ssl/server_ca.crt sslmode=verify-ca",
+		qr/SSL error/, "connect with server CA cert, without root CA");
+}
 
 # And finally, with the correct root cert.
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require cert_database=ssl/nss/root+server_ca.crt.db",
 	"connect with correct server CA cert file sslmode=require");
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca cert_database=ssl/nss/root+server_ca.crt.db",
 	"connect with correct server CA cert file sslmode=verify-ca");
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-full",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db",
 	"connect with correct server CA cert file sslmode=verify-full");
 
-# Test with cert root file that contains two certificates. The client should
-# be able to pick the right one, regardless of the order in the file.
-test_connect_ok(
-	$common_connstr,
-	"sslrootcert=ssl/both-cas-1.crt sslmode=verify-ca",
-	"cert root file that contains two certificates, order 1");
-test_connect_ok(
-	$common_connstr,
-	"sslrootcert=ssl/both-cas-2.crt sslmode=verify-ca",
-	"cert root file that contains two certificates, order 2");
+SKIP:
+{
+	skip "CA ordering is irrelevant in NSS databases", 2 if ($nss);
 
+	# Test with cert root file that contains two certificates. The client should
+	# be able to pick the right one, regardless of the order in the file.
+	test_connect_ok(
+		$common_connstr,
+		"sslrootcert=ssl/both-cas-1.crt sslmode=verify-ca",
+		"cert root file that contains two certificates, order 1");
+
+	# How about import the both-file into a database?
+	test_connect_ok(
+		$common_connstr,
+		"sslrootcert=ssl/both-cas-2.crt sslmode=verify-ca",
+		"cert root file that contains two certificates, order 2");
+}
 # CRL tests
 
 # Invalid CRL filename is the same as no CRL, succeeds
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=invalid",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=invalid cert_database=ssl/nss/root+server_ca.crt.db",
 	"sslcrl option with invalid file name");
 
-# A CRL belonging to a different CA is not accepted, fails
-test_connect_fails(
-	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/client.crl",
-	qr/SSL error/,
-	"CRL belonging to a different CA");
+SKIP:
+{
+	skip "CRL's are verified when adding to NSS database", 2 if ($nss);
+	# A CRL belonging to a different CA is not accepted, fails
+	test_connect_fails(
+		$common_connstr,
+		"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/client.crl",
+		qr/SSL error/,
+		"CRL belonging to a different CA");
+}
 
 # With the correct CRL, succeeds (this cert is not revoked)
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/root+server.crl",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/root+server.crl cert_database=ssl/nss/root+server_ca.crt__root+server.crl.db",
 	"CRL with a non-revoked cert");
 
 # Check that connecting with verify-full fails, when the hostname doesn't
 # match the hostname in the server's certificate.
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -237,14 +270,14 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"sslmode=verify-full host=wronghost.test",
-	qr/\Qserver certificate for "common-name.pg-ssltest.test" does not match host name "wronghost.test"\E/,
+	qr/\Qserver certificate for "common-name.pg-ssltest.test" does not match host name "wronghost.test"\E|SSL_ERROR_BAD_CERT_DOMAIN/,
 	"mismatch between host name and server certificate sslmode=verify-full");
 
 # Test Subject Alternative Names.
 switch_server_cert($node, 'server-multiple-alt-names');
 
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -262,12 +295,12 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"host=wronghost.alt-name.pg-ssltest.test",
-	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "wronghost.alt-name.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "wronghost.alt-name.pg-ssltest.test"\E|SSL_ERROR_BAD_CERT_DOMAIN/,
 	"host name not matching with X.509 Subject Alternative Names");
 test_connect_fails(
 	$common_connstr,
 	"host=deep.subdomain.wildcard.pg-ssltest.test",
-	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E|SSL_ERROR_BAD_CERT_DOMAIN/,
 	"host name not matching with X.509 Subject Alternative Names wildcard");
 
 # Test certificate with a single Subject Alternative Name. (this gives a
@@ -275,7 +308,7 @@ test_connect_fails(
 switch_server_cert($node, 'server-single-alt-name');
 
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -285,12 +318,12 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"host=wronghost.alt-name.pg-ssltest.test",
-	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "wronghost.alt-name.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "wronghost.alt-name.pg-ssltest.test"\E|SSL_ERROR_BAD_CERT_DOMAIN/,
 	"host name not matching with a single X.509 Subject Alternative Name");
 test_connect_fails(
 	$common_connstr,
 	"host=deep.subdomain.wildcard.pg-ssltest.test",
-	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E|SSL_ERROR_BAD_CERT_DOMAIN/,
 	"host name not matching with a single X.509 Subject Alternative Name wildcard"
 );
 
@@ -299,7 +332,7 @@ test_connect_fails(
 switch_server_cert($node, 'server-cn-and-alt-names');
 
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -312,14 +345,14 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"host=common-name.pg-ssltest.test",
-	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 1 other name) does not match host name "common-name.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 1 other name) does not match host name "common-name.pg-ssltest.test"\E|SSL_ERROR_BAD_CERT_DOMAIN/,
 	"certificate with both a CN and SANs ignores CN");
 
 # Finally, test a server certificate that has no CN or SANs. Of course, that's
 # not a very sensible certificate, but libpq should handle it gracefully.
 switch_server_cert($node, 'server-no-names');
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -328,7 +361,7 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"sslmode=verify-full host=common-name.pg-ssltest.test",
-	qr/could not get server's host name from server certificate/,
+	qr/could not get server's host name from server certificate|SSL_ERROR_BAD_CERT_DOMAIN/,
 	"server certificate without CN or SANs sslmode=verify-full");
 
 # Test that the CRL works
@@ -340,11 +373,11 @@ $common_connstr =
 # Without the CRL, succeeds. With it, fails.
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca cert_database=ssl/nss/root+server_ca.crt.db",
 	"connects without client-side CRL");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/root+server.crl",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/server.crl cert_database=ssl/nss/root+server_ca.crt__server.crl.db",
 	qr/SSL error/,
 	"does not connect with client-side CRL");
 
@@ -365,21 +398,21 @@ command_like(
 # Test min/max SSL protocol versions.
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.2",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.2 cert_database=ssl/nss/root+server_ca.crt.db",
 	"connection success with correct range of TLS protocol versions");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.1",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.1 cert_database=ssl/nss/root+server_ca.crt.db",
 	qr/invalid SSL protocol version range/,
 	"connection failure with incorrect range of TLS protocol versions");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=incorrect_tls",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=incorrect_tls cert_database=ssl/nss/root+server_ca.crt.db",
 	qr/invalid ssl_min_protocol_version value/,
 	"connection failure with an incorrect SSL protocol minimum bound");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_max_protocol_version=incorrect_tls",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_max_protocol_version=incorrect_tls cert_database=ssl/nss/root+server_ca.crt.db",
 	qr/invalid ssl_max_protocol_version value/,
 	"connection failure with an incorrect SSL protocol maximum bound");
 
@@ -390,7 +423,7 @@ test_connect_fails(
 note "running server tests";
 
 $common_connstr =
-  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR";
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client.crt__client.key.db";
 
 # no client cert
 test_connect_fails(
@@ -406,32 +439,43 @@ test_connect_ok(
 	"certificate authorization succeeds with correct client cert in PEM format"
 );
 
-# correct client cert in unencrypted DER
-test_connect_ok(
-	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-der_tmp.key",
-	"certificate authorization succeeds with correct client cert in DER format"
-);
+$common_connstr =
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR";
+
+SKIP:
+{
+	skip "NSS database not implemented in the Makefile", 1 if ($nss);
+	# correct client cert in unencrypted DER
+	test_connect_ok(
+		$common_connstr,
+		"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-der_tmp.key",
+		"certificate authorization succeeds with correct client cert in DER format"
+	);
+}
 
 # correct client cert in encrypted PEM
 test_connect_ok(
 	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='dUmmyP^#+'",
+	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='dUmmyP^#+' cert_database=ssl/nss/client.crt__client-encrypted-pem.key.db",
 	"certificate authorization succeeds with correct client cert in encrypted PEM format"
 );
 
-# correct client cert in encrypted DER
-test_connect_ok(
-	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-der_tmp.key sslpassword='dUmmyP^#+'",
-	"certificate authorization succeeds with correct client cert in encrypted DER format"
-);
+SKIP:
+{
+	skip "NSS database not implemented in the Makefile", 1 if ($nss);
+	# correct client cert in encrypted DER
+	test_connect_ok(
+		$common_connstr,
+		"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-der_tmp.key sslpassword='dUmmyP^#+'",
+		"certificate authorization succeeds with correct client cert in encrypted DER format"
+	);
+}
 
 # correct client cert in encrypted PEM with wrong password
 test_connect_fails(
 	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='wrong'",
-	qr!\Qprivate key file "ssl/client-encrypted-pem_tmp.key": bad decrypt\E!,
+	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='wrong' cert_database=ssl/nss/client.crt__client-encrypted-pem.key.db",
+	qr!connection requires a valid client certificate|\Qprivate key file "ssl/client-encrypted-pem_tmp.key": bad decrypt\E!,
 	"certificate authorization fails with correct client cert and wrong password in encrypted PEM format"
 );
 
@@ -471,18 +515,19 @@ command_like(
 		'-P',
 		'null=_null_',
 		'-d',
-		"$common_connstr user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client_tmp.key",
+		"$common_connstr user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client_tmp.key cert_database=ssl/nss/client.crt__client.key.db",
 		'-c',
 		"SELECT * FROM pg_stat_ssl WHERE pid = pg_backend_pid()"
 	],
 	qr{^pid,ssl,version,cipher,bits,compression,client_dn,client_serial,issuer_dn\r?\n
-				^\d+,t,TLSv[\d.]+,[\w-]+,\d+,f,/CN=ssltestuser,1,\Q/CN=Test CA for PostgreSQL SSL regression test client certs\E\r?$}mx,
+				^\d+,t,TLSv[\d.]+,[\w-]+,\d+,f,/?CN=ssltestuser,1,/?\QCN=Test CA for PostgreSQL SSL regression test client certs\E\r?$}mx,
 	'pg_stat_ssl with client certificate');
 
 # client key with wrong permissions
 SKIP:
 {
 	skip "Permissions check not enforced on Windows", 2 if ($windows_os);
+	skip "Key not on filesystem with NSS",            2 if ($nss);
 
 	test_connect_fails(
 		$common_connstr,
@@ -495,10 +540,13 @@ SKIP:
 test_connect_fails(
 	$common_connstr,
 	"user=anotheruser sslcert=ssl/client.crt sslkey=ssl/client_tmp.key",
-	qr/certificate authentication failed for user "anotheruser"/,
+	qr/unable to verify certificate|certificate authentication failed for user "anotheruser"/,
 	"certificate authorization fails with client cert belonging to another user"
 );
 
+$common_connstr =
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client-revoked.crt__client-revoked.key.db";
+
 # revoked client cert
 test_connect_fails(
 	$common_connstr,
@@ -510,7 +558,7 @@ test_connect_fails(
 # works, iff username matches Common Name
 # fails, iff username doesn't match Common Name.
 $common_connstr =
-  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=verifydb hostaddr=$SERVERHOSTADDR";
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=verifydb hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client.crt__client.key.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -536,17 +584,23 @@ test_connect_ok(
 # intermediate client_ca.crt is provided by client, and isn't in server's ssl_ca_file
 switch_server_cert($node, 'server-cn-only', 'root_ca');
 $common_connstr =
-  "user=ssltestuser dbname=certdb sslkey=ssl/client_tmp.key sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR";
+  "user=ssltestuser dbname=certdb sslkey=ssl/client_tmp.key sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client+client_ca.crt__client.key.db";
 
-test_connect_ok(
+TODO:
+{
+	local $TODO = "WIP failure cause currently unknown";
+	test_connect_ok(
+		$common_connstr,
+		"sslmode=require sslcert=ssl/client+client_ca.crt",
+		"intermediate client certificate is provided by client");
+}
+
+test_connect_fails(
 	$common_connstr,
-	"sslmode=require sslcert=ssl/client+client_ca.crt",
-	"intermediate client certificate is provided by client");
-test_connect_fails($common_connstr, "sslmode=require sslcert=ssl/client.crt",
-	qr/SSL error/, "intermediate client certificate is missing");
+	"sslmode=require sslcert=ssl/client.crt",
+	qr/connection requires a valid client certificate|SSL error/,
+	"intermediate client certificate is missing");
 
 # clean up
-foreach my $key (@keys)
-{
-	unlink("ssl/${key}_tmp.key");
-}
+
+SSL::Server::cleanup();
diff --git a/src/test/ssl/t/002_scram.pl b/src/test/ssl/t/002_scram.pl
index 20ab0d5b0b..b50659e568 100644
--- a/src/test/ssl/t/002_scram.pl
+++ b/src/test/ssl/t/002_scram.pl
@@ -11,11 +11,11 @@ use File::Copy;
 use FindBin;
 use lib $FindBin::RealBin;
 
-use SSLServer;
+use SSL::Server;
 
 if ($ENV{with_openssl} ne 'yes')
 {
-	plan skip_all => 'SSL not supported by this build';
+	plan skip_all => 'OpenSSL not supported by this build';
 }
 
 # This is the hostname used to connect to the server.
diff --git a/src/test/ssl/t/SSL/Backend/NSS.pm b/src/test/ssl/t/SSL/Backend/NSS.pm
new file mode 100644
index 0000000000..837f0d9891
--- /dev/null
+++ b/src/test/ssl/t/SSL/Backend/NSS.pm
@@ -0,0 +1,64 @@
+package SSL::Backend::NSS;
+
+use strict;
+use warnings;
+use Exporter;
+
+our @ISA       = qw(Exporter);
+our @EXPORT_OK = qw(get_new_nss_backend);
+
+sub new
+{
+	my ($class) = @_;
+
+	my $self = { _library => 'NSS' };
+
+	bless $self, $class;
+
+	return $self;
+}
+
+sub get_new_nss_backend
+{
+	my $class = 'SSL::Backend::NSS';
+
+	return $class->new();
+}
+
+sub init
+{
+	# Make sure the certificate databases are in place?
+}
+
+sub get_library
+{
+	my ($self) = @_;
+
+	return $self->{_library};
+}
+
+sub set_server_cert
+{
+	my $self     = $_[0];
+	my $certfile = $_[1];
+	my $cafile   = $_[2];
+	my $keyfile  = $_[3];
+
+	my $cert_nickname = $certfile . '.crt__' . $keyfile . '.key';
+	my $cert_database = $cert_nickname . '.db';
+
+	my $sslconf =
+	    "ssl_ca_file='$cafile.crt'\n"
+	  . "ssl_cert_file='ssl/$certfile.crt'\n"
+	  . "ssl_crl_file=''\n"
+	  . "ssl_database='nss/$cert_database'\n";
+
+	return $sslconf;
+}
+
+sub cleanup
+{
+	# Something?
+}
+
+1;
diff --git a/src/test/ssl/t/SSL/Backend/OpenSSL.pm b/src/test/ssl/t/SSL/Backend/OpenSSL.pm
new file mode 100644
index 0000000000..62b11b7632
--- /dev/null
+++ b/src/test/ssl/t/SSL/Backend/OpenSSL.pm
@@ -0,0 +1,103 @@
+package SSL::Backend::OpenSSL;
+
+use strict;
+use warnings;
+use Exporter;
+use File::Copy;
+
+our @ISA       = qw(Exporter);
+our @EXPORT_OK = qw(get_new_openssl_backend);
+
+our (@keys);
+
+INIT
+{
+	@keys = (
+		"client",     "client-revoked",
+		"client-der", "client-encrypted-pem",
+		"client-encrypted-der");
+}
+
+sub new
+{
+	my ($class) = @_;
+
+	my $self = { _library => 'OpenSSL' };
+
+	bless $self, $class;
+
+	return $self;
+}
+
+sub get_new_openssl_backend
+{
+	my $class = 'SSL::Backend::OpenSSL';
+
+	my $backend = $class->new();
+
+	return $backend;
+}
+
+sub init
+{
+	# The client's private key must not be world-readable, so take a copy
+	# of the key stored in the code tree and update its permissions.
+	#
+	# This changes ssl/client.key to ssl/client_tmp.key etc for the rest
+	# of the tests.
+	foreach my $key (@keys)
+	{
+		copy("ssl/${key}.key", "ssl/${key}_tmp.key")
+		  or die
+		  "couldn't copy ssl/${key}.key to ssl/${key}_tmp.key for permissions change: $!";
+		chmod 0600, "ssl/${key}_tmp.key"
+		  or die "failed to change permissions on ssl/${key}_tmp.key: $!";
+	}
+
+	# Also make a copy of that explicitly world-readable.  We can't
+	# necessarily rely on the file in the source tree having those
+	# permissions. Add it to @keys to include it in the final clean
+	# up phase.
+	copy("ssl/client.key", "ssl/client_wrongperms_tmp.key")
+	  or die
+	  "couldn't copy ssl/client.key to ssl/client_wrongperms_tmp.key: $!";
+	chmod 0644, "ssl/client_wrongperms_tmp.key"
+	  or die
+	  "failed to change permissions on ssl/client_wrongperms_tmp.key: $!";
+	push @keys, 'client_wrongperms';
+}
+
+# Change the configuration to use given server cert file, and reload
+# the server so that the configuration takes effect.
+sub set_server_cert
+{
+	my $self     = $_[0];
+	my $certfile = $_[1];
+	my $cafile   = $_[2] || "root+client_ca";
+	my $keyfile  = $_[3] || $certfile;
+
+	my $sslconf =
+	    "ssl_ca_file='$cafile.crt'\n"
+	  . "ssl_cert_file='$certfile.crt'\n"
+	  . "ssl_key_file='$keyfile.key'\n"
+	  . "ssl_crl_file='root+client.crl'\n";
+
+	return $sslconf;
+}
+
+sub get_library
+{
+	my ($self) = @_;
+
+	return $self->{_library};
+}
+
+sub cleanup
+{
+	foreach my $key (@keys)
+	{
+		unlink("ssl/${key}_tmp.key");
+	}
+}
+
+1;
diff --git a/src/test/ssl/t/SSLServer.pm b/src/test/ssl/t/SSL/Server.pm
similarity index 78%
rename from src/test/ssl/t/SSLServer.pm
rename to src/test/ssl/t/SSL/Server.pm
index f5987a003e..1261d21861 100644
--- a/src/test/ssl/t/SSLServer.pm
+++ b/src/test/ssl/t/SSL/Server.pm
@@ -23,19 +23,39 @@
 # explicitly because an invalid sslcert or sslrootcert, respectively,
 # causes those to be ignored.)
 
-package SSLServer;
+package SSL::Server;
 
 use strict;
 use warnings;
 use PostgresNode;
+use RecursiveCopy;
 use TestLib;
 use File::Basename;
 use File::Copy;
 use Test::More;
+use SSL::Backend::OpenSSL qw(get_new_openssl_backend);
+use SSL::Backend::NSS qw(get_new_nss_backend);
+
+our ($openssl, $nss, $backend);
+
+# The TLS backend which the server is using should be mostly transparent for
+# the user, apart from individual configuration settings, so keep the backend
+# specific things abstracted behind SSL::Server.
+if ($ENV{with_openssl} eq 'yes')
+{
+	$backend = get_new_openssl_backend();
+	$openssl = 1;
+}
+elsif ($ENV{with_nss} eq 'yes')
+{
+	$backend = get_new_nss_backend();
+	$nss     = 1;
+}
 
 use Exporter 'import';
 our @EXPORT = qw(
   configure_test_server_for_ssl
+  set_server_cert
   switch_server_cert
   test_connect_fails
   test_connect_ok
@@ -144,12 +164,19 @@ sub configure_test_server_for_ssl
 	close $sslconf;
 
 	# Copy all server certificates and keys, and client root cert, to the data dir
-	copy_files("ssl/server-*.crt", $pgdata);
-	copy_files("ssl/server-*.key", $pgdata);
-	chmod(0600, glob "$pgdata/server-*.key") or die $!;
-	copy_files("ssl/root+client_ca.crt", $pgdata);
-	copy_files("ssl/root_ca.crt",        $pgdata);
-	copy_files("ssl/root+client.crl",    $pgdata);
+	if (defined($openssl))
+	{
+		copy_files("ssl/server-*.crt", $pgdata);
+		copy_files("ssl/server-*.key", $pgdata);
+		chmod(0600, glob "$pgdata/server-*.key") or die $!;
+		copy_files("ssl/root+client_ca.crt", $pgdata);
+		copy_files("ssl/root_ca.crt",        $pgdata);
+		copy_files("ssl/root+client.crl",    $pgdata);
+	}
+	elsif (defined($nss))
+	{
+		RecursiveCopy::copypath("ssl/nss", $pgdata . "/nss") if -e "ssl/nss";
+	}
 
 	# Stop and restart server to load new listen_addresses.
 	$node->restart;
@@ -157,26 +184,51 @@ sub configure_test_server_for_ssl
 	# Change pg_hba after restart because hostssl requires ssl=on
 	configure_hba_for_ssl($node, $servercidr, $authmethod);
 
+	# Finally, perform backend specific configuration
+	$backend->init();
+
 	return;
 }
 
-# Change the configuration to use given server cert file, and reload
-# the server so that the configuration takes effect.
-sub switch_server_cert
+sub ssl_library
+{
+	return $backend->get_library();
+}
+
+sub cleanup
+{
+	$backend->cleanup();
+}
+
+# Change the configuration to use given server cert file,
+sub set_server_cert
 {
 	my $node     = $_[0];
 	my $certfile = $_[1];
 	my $cafile   = $_[2] || "root+client_ca";
+	my $keyfile  = $_[3] || '';
+	my $pwcmd    = $_[4] || '';
 	my $pgdata   = $node->data_dir;
 
+	$keyfile = $certfile if $keyfile eq '';
+
 	open my $sslconf, '>', "$pgdata/sslconfig.conf";
 	print $sslconf "ssl=on\n";
-	print $sslconf "ssl_ca_file='$cafile.crt'\n";
-	print $sslconf "ssl_cert_file='$certfile.crt'\n";
-	print $sslconf "ssl_key_file='$certfile.key'\n";
-	print $sslconf "ssl_crl_file='root+client.crl'\n";
+	print $sslconf $backend->set_server_cert($certfile, $cafile, $keyfile);
+	print $sslconf "ssl_passphrase_command='$pwcmd'\n"
+	  unless $pwcmd eq '';
 	close $sslconf;
+	return;
+}
 
+# Change the configuration to use given server cert file, and reload
+# the server so that the configuration takes effect.
+# Takes the same arguments as set_server_cert, which it calls to do that
+# piece of the work.
+sub switch_server_cert
+{
+	my $node = $_[0];
+	set_server_cert(@_);
 	$node->restart;
 	return;
 }
diff --git a/src/tools/msvc/Install.pm b/src/tools/msvc/Install.pm
index ea3af48777..afe72a7e97 100644
--- a/src/tools/msvc/Install.pm
+++ b/src/tools/msvc/Install.pm
@@ -438,7 +438,8 @@ sub CopyContribFiles
 		{
 			# These configuration-based exclusions must match vcregress.pl
 			next if ($d eq "uuid-ossp"  && !defined($config->{uuid}));
-			next if ($d eq "sslinfo"    && !defined($config->{openssl}));
+			next if ($d eq "sslinfo"    && !defined($config->{openssl})
+			  && !defined($config->{nss}));
 			next if ($d eq "xml2"       && !defined($config->{xml}));
 			next if ($d =~ /_plperl$/   && !defined($config->{perl}));
 			next if ($d =~ /_plpython$/ && !defined($config->{python}));
diff --git a/src/tools/msvc/Mkvcbuild.pm b/src/tools/msvc/Mkvcbuild.pm
index 90594bd41b..d6aefbfcbf 100644
--- a/src/tools/msvc/Mkvcbuild.pm
+++ b/src/tools/msvc/Mkvcbuild.pm
@@ -192,12 +192,19 @@ sub mkvcbuild
 	$postgres->FullExportDLL('postgres.lib');
 
 	# The OBJS scraper doesn't know about ifdefs, so remove appropriate files
-	# if building without OpenSSL.
-	if (!$solution->{options}->{openssl})
+	# if building without various options.
+	if (!$solution->{options}->{openssl} && !$solution->{options}->{nss})
 	{
 		$postgres->RemoveFile('src/backend/libpq/be-secure-common.c');
+	}
+	if (!$solution->{options}->{openssl})
+	{
 		$postgres->RemoveFile('src/backend/libpq/be-secure-openssl.c');
 	}
+	if (!$solution->{options}->{nss})
+	{
+		$postgres->RemoveFile('src/backend/libpq/be-secure-nss.c');
+	}
 	if (!$solution->{options}->{gss})
 	{
 		$postgres->RemoveFile('src/backend/libpq/be-gssapi-common.c');
@@ -255,12 +262,19 @@ sub mkvcbuild
 	$libpq->AddReference($libpgcommon, $libpgport);
 
 	# The OBJS scraper doesn't know about ifdefs, so remove appropriate files
-	# if building without OpenSSL.
-	if (!$solution->{options}->{openssl})
+	# if building without various options
+	if (!$solution->{options}->{openssl} && !$solution->{options}->{nss})
 	{
 		$libpq->RemoveFile('src/interfaces/libpq/fe-secure-common.c');
+	}
+	if (!$solution->{options}->{openssl})
+	{
 		$libpq->RemoveFile('src/interfaces/libpq/fe-secure-openssl.c');
 	}
+	if (!$solution->{options}->{nss})
+	{
+		$libpq->RemoveFile('src/interfaces/libpq/fe-secure-nss.c');
+	}
 	if (!$solution->{options}->{gss})
 	{
 		$libpq->RemoveFile('src/interfaces/libpq/fe-gssapi-common.c');
@@ -428,9 +442,14 @@ sub mkvcbuild
 		push @contrib_excludes, 'xml2';
 	}
 
+	if (!$solution->{options}->{openssl} && !$solution->{options}->{nss})
+	{
+		push @contrib_excludes, 'sslinfo';
+	}
+
 	if (!$solution->{options}->{openssl})
 	{
-		push @contrib_excludes, 'sslinfo', 'ssl_passphrase_callback';
+		push @contrib_excludes, 'ssl_passphrase_callback';
 	}
 
 	if (!$solution->{options}->{uuid})
diff --git a/src/tools/msvc/Solution.pm b/src/tools/msvc/Solution.pm
index bc8904732f..ac11d9ab26 100644
--- a/src/tools/msvc/Solution.pm
+++ b/src/tools/msvc/Solution.pm
@@ -484,6 +484,7 @@ sub GenerateFiles
 		USE_NAMED_POSIX_SEMAPHORES => undef,
 		USE_OPENSSL                => undef,
 		USE_OPENSSL_RANDOM         => undef,
+		USE_NSS                    => undef,
 		USE_PAM                    => undef,
 		USE_SLICING_BY_8_CRC32C    => undef,
 		USE_SSE42_CRC32C           => undef,
@@ -537,6 +538,10 @@ sub GenerateFiles
 			$define{HAVE_OPENSSL_INIT_SSL}      = 1;
 		}
 	}
+	if ($self->{options}->{nss})
+	{
+		$define{USE_NSS} = 1;
+	}
 
 	$self->GenerateConfigHeader('src/include/pg_config.h',     \%define, 1);
 	$self->GenerateConfigHeader('src/include/pg_config_ext.h', \%define, 0);
@@ -1004,6 +1009,21 @@ sub AddProject
 			}
 		}
 	}
+	if ($self->{options}->{nss})
+	{
+		$proj->AddIncludeDir($self->{options}->{nss} . '\..\public\nss');
+		$proj->AddIncludeDir($self->{options}->{nss} . '\include\nspr');
+		foreach my $lib (qw(plds4 plc4 nspr4))
+		{
+			$proj->AddLibrary($self->{options}->{nss} .
+							  '\lib\lib' . "$lib.lib", 0);
+		}
+		foreach my $lib (qw(ssl3 smime3 nss3))
+		{
+			$proj->AddLibrary($self->{options}->{nss} .
+							  '\lib' . "\\$lib.dll.lib", 0);
+		}
+	}
 	if ($self->{options}->{nls})
 	{
 		$proj->AddIncludeDir($self->{options}->{nls} . '\include');
diff --git a/src/tools/msvc/config_default.pl b/src/tools/msvc/config_default.pl
index 2ef2cfc4e9..49dc4d5864 100644
--- a/src/tools/msvc/config_default.pl
+++ b/src/tools/msvc/config_default.pl
@@ -17,6 +17,7 @@ our $config = {
 	perl      => undef,    # --with-perl=<path>
 	python    => undef,    # --with-python=<path>
 	openssl   => undef,    # --with-openssl=<path>
+	nss       => undef,    # --with-nss=<path>
 	uuid      => undef,    # --with-uuid=<path>
 	xml       => undef,    # --with-libxml=<path>
 	xslt      => undef,    # --with-libxslt=<path>
-- 
2.21.1 (Apple Git-122.3)

From ed0da4793cb211cced0cd8812c648fb63e066bb6 Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Tue, 27 Oct 2020 21:03:41 +0100
Subject: [PATCH] Support for NSS as a TLS backend v13

Daniel Gustafsson, Andrew Dunstan
---
 configure                                     |  342 ++++-
 configure.ac                                  |   50 +-
 contrib/Makefile                              |    2 +-
 contrib/pgcrypto/Makefile                     |    5 +
 contrib/pgcrypto/nss.c                        |  773 +++++++++++
 contrib/pgcrypto/openssl.c                    |    2 +-
 contrib/pgcrypto/px.c                         |    1 +
 contrib/pgcrypto/px.h                         |    1 +
 .../postgres_fdw/expected/postgres_fdw.out    |    2 +-
 contrib/sslinfo/sslinfo.c                     |  164 ++-
 doc/src/sgml/acronyms.sgml                    |   43 +
 doc/src/sgml/config.sgml                      |   28 +-
 doc/src/sgml/installation.sgml                |   30 +-
 doc/src/sgml/libpq.sgml                       |   27 +-
 doc/src/sgml/pgcrypto.sgml                    |   38 +-
 doc/src/sgml/runtime.sgml                     |   78 +-
 doc/src/sgml/sslinfo.sgml                     |   14 +-
 src/Makefile.global.in                        |   10 +
 src/backend/libpq/Makefile                    |    4 +
 src/backend/libpq/auth.c                      |    7 +
 src/backend/libpq/be-secure-nss.c             | 1175 +++++++++++++++++
 src/backend/libpq/be-secure-openssl.c         |   16 +-
 src/backend/libpq/be-secure.c                 |    3 +
 src/backend/libpq/hba.c                       |    2 +-
 src/backend/utils/misc/guc.c                  |   20 +-
 src/include/common/pg_nss.h                   |  141 ++
 src/include/libpq/libpq-be.h                  |   13 +-
 src/include/libpq/libpq.h                     |    3 +
 src/include/pg_config.h.in                    |    6 +
 src/include/pg_config_manual.h                |    5 +-
 src/interfaces/libpq/Makefile                 |   11 +-
 src/interfaces/libpq/fe-connect.c             |    4 +
 src/interfaces/libpq/fe-secure-nss.c          | 1018 ++++++++++++++
 src/interfaces/libpq/fe-secure.c              |    5 +-
 src/interfaces/libpq/libpq-fe.h               |   11 +
 src/interfaces/libpq/libpq-int.h              |    5 +
 src/port/pg_strong_random.c                   |   37 +
 src/test/Makefile                             |    2 +-
 src/test/ssl/Makefile                         |  176 +++
 src/test/ssl/t/001_ssltests.pl                |  326 +++--
 src/test/ssl/t/002_scram.pl                   |    4 +-
 src/test/ssl/t/SSL/Backend/NSS.pm             |   64 +
 src/test/ssl/t/SSL/Backend/OpenSSL.pm         |  103 ++
 .../ssl/t/{SSLServer.pm => SSL/Server.pm}     |   80 +-
 src/tools/msvc/Install.pm                     |    3 +-
 src/tools/msvc/Mkvcbuild.pm                   |   29 +-
 src/tools/msvc/Solution.pm                    |   20 +
 src/tools/msvc/config_default.pl              |    1 +
 48 files changed, 4618 insertions(+), 286 deletions(-)
 create mode 100644 contrib/pgcrypto/nss.c
 create mode 100644 src/backend/libpq/be-secure-nss.c
 create mode 100644 src/include/common/pg_nss.h
 create mode 100644 src/interfaces/libpq/fe-secure-nss.c
 create mode 100644 src/test/ssl/t/SSL/Backend/NSS.pm
 create mode 100644 src/test/ssl/t/SSL/Backend/OpenSSL.pm
 rename src/test/ssl/t/{SSLServer.pm => SSL/Server.pm} (78%)

diff --git a/configure b/configure
index ace4ed5dec..412f40b58a 100755
--- a/configure
+++ b/configure
@@ -654,6 +654,8 @@ LIBOBJS
 UUID_LIBS
 LDAP_LIBS_BE
 LDAP_LIBS_FE
+NSPR_CONFIG
+NSS_CONFIG
 PTHREAD_CFLAGS
 PTHREAD_LIBS
 PTHREAD_CC
@@ -711,6 +713,7 @@ with_uuid
 with_readline
 with_systemd
 with_selinux
+with_nss
 with_openssl
 with_ldap
 with_krb_srvnam
@@ -857,6 +860,7 @@ with_bsd_auth
 with_ldap
 with_bonjour
 with_openssl
+with_nss
 with_selinux
 with_systemd
 with_readline
@@ -1559,6 +1563,7 @@ Optional Packages:
   --with-ldap             build with LDAP support
   --with-bonjour          build with Bonjour support
   --with-openssl          build with OpenSSL support
+  --with-nss              build with NSS support
   --with-selinux          build with SELinux support
   --with-systemd          build with systemd support
   --without-readline      do not use GNU Readline nor BSD Libedit for editing
@@ -8106,6 +8111,41 @@ fi
 $as_echo "$with_openssl" >&6; }
 
 
+#
+# LibNSS
+#
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether to build with NSS support" >&5
+$as_echo_n "checking whether to build with NSS support... " >&6; }
+
+
+
+# Check whether --with-nss was given.
+if test "${with_nss+set}" = set; then :
+  withval=$with_nss;
+  case $withval in
+    yes)
+
+$as_echo "#define USE_NSS 1" >>confdefs.h
+
+      ;;
+    no)
+      :
+      ;;
+    *)
+      as_fn_error $? "no argument expected for --with-nss option" "$LINENO" 5
+      ;;
+  esac
+
+else
+  with_nss=no
+
+fi
+
+
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $with_nss" >&5
+$as_echo "$with_nss" >&6; }
+
+
 #
 # SELinux
 #
@@ -12180,6 +12220,9 @@ fi
 fi
 
 if test "$with_openssl" = yes ; then
+  if test x"$with_nss" = x"yes" ; then
+    as_fn_error $? "multiple SSL backends cannot be enabled simultaneously\"" "$LINENO" 5
+  fi
     # Minimum required OpenSSL version is 1.0.1
 
 $as_echo "#define OPENSSL_API_COMPAT 0x10001000L" >>confdefs.h
@@ -12442,6 +12485,274 @@ done
 
 fi
 
+if test "$with_nss" = yes ; then
+  if test x"$with_openssl" = x"yes" ; then
+    as_fn_error $? "multiple SSL backends cannot be enabled simultaneously\"" "$LINENO" 5
+  fi
+  # TODO: fallback in case nss-config/nspr-config aren't found.
+  if test -z "$NSS_CONFIG"; then
+  for ac_prog in nss-config
+do
+  # Extract the first word of "$ac_prog", so it can be a program name with args.
+set dummy $ac_prog; ac_word=$2
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
+$as_echo_n "checking for $ac_word... " >&6; }
+if ${ac_cv_path_NSS_CONFIG+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  case $NSS_CONFIG in
+  [\\/]* | ?:[\\/]*)
+  ac_cv_path_NSS_CONFIG="$NSS_CONFIG" # Let the user override the test with a path.
+  ;;
+  *)
+  as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH
+do
+  IFS=$as_save_IFS
+  test -z "$as_dir" && as_dir=.
+    for ac_exec_ext in '' $ac_executable_extensions; do
+  if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
+    ac_cv_path_NSS_CONFIG="$as_dir/$ac_word$ac_exec_ext"
+    $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
+    break 2
+  fi
+done
+  done
+IFS=$as_save_IFS
+
+  ;;
+esac
+fi
+NSS_CONFIG=$ac_cv_path_NSS_CONFIG
+if test -n "$NSS_CONFIG"; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $NSS_CONFIG" >&5
+$as_echo "$NSS_CONFIG" >&6; }
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+fi
+
+
+  test -n "$NSS_CONFIG" && break
+done
+
+else
+  # Report the value of NSS_CONFIG in configure's output in all cases.
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for NSS_CONFIG" >&5
+$as_echo_n "checking for NSS_CONFIG... " >&6; }
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $NSS_CONFIG" >&5
+$as_echo "$NSS_CONFIG" >&6; }
+fi
+
+  if test -z "$NSPR_CONFIG"; then
+  for ac_prog in nspr-config
+do
+  # Extract the first word of "$ac_prog", so it can be a program name with args.
+set dummy $ac_prog; ac_word=$2
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
+$as_echo_n "checking for $ac_word... " >&6; }
+if ${ac_cv_path_NSPR_CONFIG+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  case $NSPR_CONFIG in
+  [\\/]* | ?:[\\/]*)
+  ac_cv_path_NSPR_CONFIG="$NSPR_CONFIG" # Let the user override the test with a path.
+  ;;
+  *)
+  as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH
+do
+  IFS=$as_save_IFS
+  test -z "$as_dir" && as_dir=.
+    for ac_exec_ext in '' $ac_executable_extensions; do
+  if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
+    ac_cv_path_NSPR_CONFIG="$as_dir/$ac_word$ac_exec_ext"
+    $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
+    break 2
+  fi
+done
+  done
+IFS=$as_save_IFS
+
+  ;;
+esac
+fi
+NSPR_CONFIG=$ac_cv_path_NSPR_CONFIG
+if test -n "$NSPR_CONFIG"; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $NSPR_CONFIG" >&5
+$as_echo "$NSPR_CONFIG" >&6; }
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+fi
+
+
+  test -n "$NSPR_CONFIG" && break
+done
+
+else
+  # Report the value of NSPR_CONFIG in configure's output in all cases.
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for NSPR_CONFIG" >&5
+$as_echo_n "checking for NSPR_CONFIG... " >&6; }
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $NSPR_CONFIG" >&5
+$as_echo "$NSPR_CONFIG" >&6; }
+fi
+
+  if test -n "$NSS_CONFIG"; then
+    NSS_LIBS=`$NSS_CONFIG --libs`
+	NSS_CFLAGS=`$NSS_CONFIG --cflags`
+  fi
+  if test -n "$NSPR_CONFIG"; then
+	NSPR_LIBS=`$NSPR_CONFIG --libs`
+	NSPR_CFLAGS=`$NSPR_CONFIG --cflags`
+  fi
+
+  LDFLAGS="$LDFLAGS $NSS_LIBS $NSPR_LIBS"
+  CFLAGS="$CFLAGS $NSS_CFLAGS $NSPR_CFLAGS"
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for SSL_VersionRangeSet in -lnss3" >&5
+$as_echo_n "checking for SSL_VersionRangeSet in -lnss3... " >&6; }
+if ${ac_cv_lib_nss3_SSL_VersionRangeSet+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lnss3  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char SSL_VersionRangeSet ();
+int
+main ()
+{
+return SSL_VersionRangeSet ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_lib_nss3_SSL_VersionRangeSet=yes
+else
+  ac_cv_lib_nss3_SSL_VersionRangeSet=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_nss3_SSL_VersionRangeSet" >&5
+$as_echo "$ac_cv_lib_nss3_SSL_VersionRangeSet" >&6; }
+if test "x$ac_cv_lib_nss3_SSL_VersionRangeSet" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_LIBNSS3 1
+_ACEOF
+
+  LIBS="-lnss3 $LIBS"
+
+else
+  as_fn_error $? "library 'nss3' is required for NSS" "$LINENO" 5
+fi
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for PR_GetDefaultIOMethods in -lnspr4" >&5
+$as_echo_n "checking for PR_GetDefaultIOMethods in -lnspr4... " >&6; }
+if ${ac_cv_lib_nspr4_PR_GetDefaultIOMethods+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lnspr4  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char PR_GetDefaultIOMethods ();
+int
+main ()
+{
+return PR_GetDefaultIOMethods ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_lib_nspr4_PR_GetDefaultIOMethods=yes
+else
+  ac_cv_lib_nspr4_PR_GetDefaultIOMethods=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_nspr4_PR_GetDefaultIOMethods" >&5
+$as_echo "$ac_cv_lib_nspr4_PR_GetDefaultIOMethods" >&6; }
+if test "x$ac_cv_lib_nspr4_PR_GetDefaultIOMethods" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_LIBNSPR4 1
+_ACEOF
+
+  LIBS="-lnspr4 $LIBS"
+
+else
+  as_fn_error $? "library 'nspr4' is required for NSS" "$LINENO" 5
+fi
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for SSL_GetImplementedCiphers in -lssl3" >&5
+$as_echo_n "checking for SSL_GetImplementedCiphers in -lssl3... " >&6; }
+if ${ac_cv_lib_ssl3_SSL_GetImplementedCiphers+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lssl3  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char SSL_GetImplementedCiphers ();
+int
+main ()
+{
+return SSL_GetImplementedCiphers ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_lib_ssl3_SSL_GetImplementedCiphers=yes
+else
+  ac_cv_lib_ssl3_SSL_GetImplementedCiphers=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_ssl3_SSL_GetImplementedCiphers" >&5
+$as_echo "$ac_cv_lib_ssl3_SSL_GetImplementedCiphers" >&6; }
+if test "x$ac_cv_lib_ssl3_SSL_GetImplementedCiphers" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_LIBSSL3 1
+_ACEOF
+
+  LIBS="-lssl3 $LIBS"
+
+else
+  as_fn_error $? "library 'ssl3' is required for NSS" "$LINENO" 5
+fi
+
+fi
+
 if test "$with_pam" = yes ; then
   { $as_echo "$as_me:${as_lineno-$LINENO}: checking for pam_start in -lpam" >&5
 $as_echo_n "checking for pam_start in -lpam... " >&6; }
@@ -13344,6 +13655,25 @@ else
 fi
 
 
+fi
+
+if test "$with_nss" = yes ; then
+  ac_fn_c_check_header_mongrel "$LINENO" "nss/ssl.h" "ac_cv_header_nss_ssl_h" "$ac_includes_default"
+if test "x$ac_cv_header_nss_ssl_h" = xyes; then :
+
+else
+  as_fn_error $? "header file <nss/ssl.h> is required for NSS" "$LINENO" 5
+fi
+
+
+  ac_fn_c_check_header_mongrel "$LINENO" "nss/nss.h" "ac_cv_header_nss_nss_h" "$ac_includes_default"
+if test "x$ac_cv_header_nss_nss_h" = xyes; then :
+
+else
+  as_fn_error $? "header file <nss/nss.h> is required for NSS" "$LINENO" 5
+fi
+
+
 fi
 
 if test "$with_pam" = yes ; then
@@ -18061,11 +18391,13 @@ fi
 # in the template or configure command line.
 
 # If not selected manually, try to select a source automatically.
-if test x"$USE_OPENSSL_RANDOM" = x"" && test x"$USE_WIN32_RANDOM" = x"" && test x"$USE_DEV_URANDOM" = x"" ; then
+if test x"$USE_OPENSSL_RANDOM" = x"" && test x"$USE_WIN32_RANDOM" = x"" && test x"$USE_DEV_URANDOM" = x"" && test x"$USE_NSS_RANDOM" = x"" ; then
   if test x"$with_openssl" = x"yes" ; then
     USE_OPENSSL_RANDOM=1
   elif test "$PORTNAME" = "win32" ; then
     USE_WIN32_RANDOM=1
+  elif test x"$with_nss" = x"yes" ; then
+    USE_NSS_RANDOM=1
   else
     { $as_echo "$as_me:${as_lineno-$LINENO}: checking for /dev/urandom" >&5
 $as_echo_n "checking for /dev/urandom... " >&6; }
@@ -18107,6 +18439,12 @@ $as_echo "#define USE_WIN32_RANDOM 1" >>confdefs.h
 
   { $as_echo "$as_me:${as_lineno-$LINENO}: result: Windows native" >&5
 $as_echo "Windows native" >&6; }
+elif test x"$USE_NSS_RANDOM" = x"1" ; then
+
+$as_echo "#define USE_NSS_RANDOM 1" >>confdefs.h
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: NSS" >&5
+$as_echo "NSS" >&6; }
 elif test x"$USE_DEV_URANDOM" = x"1" ; then
 
 $as_echo "#define USE_DEV_URANDOM 1" >>confdefs.h
@@ -18116,7 +18454,7 @@ $as_echo "/dev/urandom" >&6; }
 else
   as_fn_error $? "
 no source of strong random numbers was found
-PostgreSQL can use OpenSSL or /dev/urandom as a source of random numbers." "$LINENO" 5
+PostgreSQL can use OpenSSL, NSS, Windows native RNG or /dev/urandom as a source of random numbers." "$LINENO" 5
 fi
 
 # If not set in template file, set bytes to use libc memset()
diff --git a/configure.ac b/configure.ac
index 5b91c83fd0..86311946d0 100644
--- a/configure.ac
+++ b/configure.ac
@@ -861,6 +861,15 @@ PGAC_ARG_BOOL(with, openssl, no, [build with OpenSSL support],
 AC_MSG_RESULT([$with_openssl])
 AC_SUBST(with_openssl)
 
+#
+# LibNSS
+#
+AC_MSG_CHECKING([whether to build with NSS support])
+PGAC_ARG_BOOL(with, nss, no, [build with NSS support],
+              [AC_DEFINE([USE_NSS], 1, [Define to build with NSS support. (--with-nss)])])
+AC_MSG_RESULT([$with_nss])
+AC_SUBST(with_nss)
+
 #
 # SELinux
 #
@@ -1210,6 +1219,9 @@ if test "$with_gssapi" = yes ; then
 fi
 
 if test "$with_openssl" = yes ; then
+  if test x"$with_nss" = x"yes" ; then
+    AC_MSG_ERROR([multiple SSL backends cannot be enabled simultaneously"])
+  fi
   dnl Order matters!
   # Minimum required OpenSSL version is 1.0.1
   AC_DEFINE(OPENSSL_API_COMPAT, [0x10001000L],
@@ -1235,6 +1247,30 @@ if test "$with_openssl" = yes ; then
   AC_CHECK_FUNCS([CRYPTO_lock])
 fi
 
+if test "$with_nss" = yes ; then
+  if test x"$with_openssl" = x"yes" ; then
+    AC_MSG_ERROR([multiple SSL backends cannot be enabled simultaneously"])
+  fi
+  # TODO: fallback in case nss-config/nspr-config aren't found.
+  PGAC_PATH_PROGS(NSS_CONFIG, nss-config)
+  PGAC_PATH_PROGS(NSPR_CONFIG, nspr-config)
+  if test -n "$NSS_CONFIG"; then
+    NSS_LIBS=`$NSS_CONFIG --libs`
+	NSS_CFLAGS=`$NSS_CONFIG --cflags`
+  fi
+  if test -n "$NSPR_CONFIG"; then
+	NSPR_LIBS=`$NSPR_CONFIG --libs`
+	NSPR_CFLAGS=`$NSPR_CONFIG --cflags`
+  fi
+
+  LDFLAGS="$LDFLAGS $NSS_LIBS $NSPR_LIBS"
+  CFLAGS="$CFLAGS $NSS_CFLAGS $NSPR_CFLAGS"
+
+  AC_CHECK_LIB(nss3, SSL_VersionRangeSet, [], [AC_MSG_ERROR([library 'nss3' is required for NSS])])
+  AC_CHECK_LIB(nspr4, PR_GetDefaultIOMethods, [], [AC_MSG_ERROR([library 'nspr4' is required for NSS])])
+  AC_CHECK_LIB(ssl3, SSL_GetImplementedCiphers, [], [AC_MSG_ERROR([library 'ssl3' is required for NSS])])
+fi
+
 if test "$with_pam" = yes ; then
   AC_CHECK_LIB(pam,    pam_start, [], [AC_MSG_ERROR([library 'pam' is required for PAM])])
 fi
@@ -1410,6 +1446,11 @@ if test "$with_openssl" = yes ; then
   AC_CHECK_HEADER(openssl/err.h, [], [AC_MSG_ERROR([header file <openssl/err.h> is required for OpenSSL])])
 fi
 
+if test "$with_nss" = yes ; then
+  AC_CHECK_HEADER(nss/ssl.h, [], [AC_MSG_ERROR([header file <nss/ssl.h> is required for NSS])])
+  AC_CHECK_HEADER(nss/nss.h, [], [AC_MSG_ERROR([header file <nss/nss.h> is required for NSS])])
+fi
+
 if test "$with_pam" = yes ; then
   AC_CHECK_HEADERS(security/pam_appl.h, [],
                    [AC_CHECK_HEADERS(pam/pam_appl.h, [],
@@ -2158,11 +2199,13 @@ fi
 # in the template or configure command line.
 
 # If not selected manually, try to select a source automatically.
-if test x"$USE_OPENSSL_RANDOM" = x"" && test x"$USE_WIN32_RANDOM" = x"" && test x"$USE_DEV_URANDOM" = x"" ; then
+if test x"$USE_OPENSSL_RANDOM" = x"" && test x"$USE_WIN32_RANDOM" = x"" && test x"$USE_DEV_URANDOM" = x"" && test x"$USE_NSS_RANDOM" = x"" ; then
   if test x"$with_openssl" = x"yes" ; then
     USE_OPENSSL_RANDOM=1
   elif test "$PORTNAME" = "win32" ; then
     USE_WIN32_RANDOM=1
+  elif test x"$with_nss" = x"yes" ; then
+    USE_NSS_RANDOM=1
   else
     AC_CHECK_FILE([/dev/urandom], [], [])
 
@@ -2179,13 +2222,16 @@ if test x"$USE_OPENSSL_RANDOM" = x"1" ; then
 elif test x"$USE_WIN32_RANDOM" = x"1" ; then
   AC_DEFINE(USE_WIN32_RANDOM, 1, [Define to use native Windows API for random number generation])
   AC_MSG_RESULT([Windows native])
+elif test x"$USE_NSS_RANDOM" = x"1" ; then
+  AC_DEFINE(USE_NSS_RANDOM, 1, [Define to use NSS for random number generation])
+  AC_MSG_RESULT([NSS])
 elif test x"$USE_DEV_URANDOM" = x"1" ; then
   AC_DEFINE(USE_DEV_URANDOM, 1, [Define to use /dev/urandom for random number generation])
   AC_MSG_RESULT([/dev/urandom])
 else
   AC_MSG_ERROR([
 no source of strong random numbers was found
-PostgreSQL can use OpenSSL or /dev/urandom as a source of random numbers.])
+PostgreSQL can use OpenSSL, NSS, Windows native RNG or /dev/urandom as a source of random numbers.])
 fi
 
 # If not set in template file, set bytes to use libc memset()
diff --git a/contrib/Makefile b/contrib/Makefile
index 7a4866e338..d0b01cb2cc 100644
--- a/contrib/Makefile
+++ b/contrib/Makefile
@@ -52,7 +52,7 @@ SUBDIRS = \
 		unaccent	\
 		vacuumlo
 
-ifeq ($(with_openssl),yes)
+ifeq ($(with_ssl),yes)
 SUBDIRS += sslinfo
 else
 ALWAYS_SUBDIRS += sslinfo
diff --git a/contrib/pgcrypto/Makefile b/contrib/pgcrypto/Makefile
index 61eabd2fc0..6c69ee5a6b 100644
--- a/contrib/pgcrypto/Makefile
+++ b/contrib/pgcrypto/Makefile
@@ -7,11 +7,16 @@ INT_TESTS = sha2
 OSSL_SRCS = openssl.c pgp-mpi-openssl.c
 OSSL_TESTS = sha2 des 3des cast5
 
+NSS_SRCS = nss.c pgp-mpi-internal.c imath.c blf.c
+NSS_TESTS = sha2 des 3des
+
 ZLIB_TST = pgp-compression
 ZLIB_OFF_TST = pgp-zlib-DISABLED
 
 CF_SRCS = $(if $(subst no,,$(with_openssl)), $(OSSL_SRCS), $(INT_SRCS))
+CF_SRCS = $(if $(subst no,,$(with_nss)), $(NSS_SRCS), $(INT_SRCS))
 CF_TESTS = $(if $(subst no,,$(with_openssl)), $(OSSL_TESTS), $(INT_TESTS))
+CF_TESTS = $(if $(subst no,,$(with_nss)), $(NSS_TESTS), $(INT_TESTS))
 CF_PGP_TESTS = $(if $(subst no,,$(with_zlib)), $(ZLIB_TST), $(ZLIB_OFF_TST))
 
 SRCS = \
diff --git a/contrib/pgcrypto/nss.c b/contrib/pgcrypto/nss.c
new file mode 100644
index 0000000000..e1291ed403
--- /dev/null
+++ b/contrib/pgcrypto/nss.c
@@ -0,0 +1,773 @@
+/*-------------------------------------------------------------------------
+ *
+ * nss.c
+ *	  Wrapper for using NSS as a backend for pgcrypto PX
+ *
+ *
+ * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ *	  contrib/pgcrypto/nss.c
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#include "postgres.h"
+
+#include "px.h"
+#include "blf.h"
+#include "utils/memutils.h"
+
+/*
+ * BITS_PER_BYTE is also defined in the NSPR header files, so we need to undef
+ * our version to avoid compiler warnings on redefinition.
+ */
+#define pg_BITS_PER_BYTE BITS_PER_BYTE
+#undef BITS_PER_BYTE
+
+#include <nss/nss.h>
+#include <nss/hasht.h>
+#include <nss/pk11func.h>
+#include <nss/pk11pub.h>
+#include <nss/secitem.h>
+#include <nss/sechash.h>
+#include <nss/secoid.h>
+#include <nss/secerr.h>
+
+/*
+ * Ensure that the colliding definitions match, else throw an error. In case
+ * NSPR has removed the definition for some reason, make sure to put ours
+ * back again.
+ */
+#if defined(BITS_PER_BYTE)
+#if BITS_PER_BYTE != pg_BITS_PER_BYTE
+#error "incompatible byte widths between NSPR and postgres"
+#endif
+#else
+#define BITS_PER_BYTE pg_BITS_PER_BYTE
+#endif
+#undef pg_BITS_PER_BYTE
+
+/*
+ * Define our own mechanisms for Blowfish as it's not implemented by NSS.
+ */
+#define BLOWFISH_CBC	(1)
+#define BLOWFISH_ECB	(2)
+
+/*
+ * Data structures for recording cipher implementations as well as ongoing
+ * cipher operations.
+ */
+typedef struct nss_digest
+{
+	NSSInitContext *context;
+	PK11Context *hash_context;
+	HASH_HashType hash_type;
+}			nss_digest;
+
+typedef struct cipher_implementation
+{
+	/* Function pointers to cipher operations */
+	int			(*init) (PX_Cipher *pxc, const uint8 *key, unsigned klen, const uint8 *iv);
+	unsigned	(*get_block_size) (PX_Cipher *pxc);
+	unsigned 	(*get_key_size) (PX_Cipher *pxc);
+	unsigned 	(*get_iv_size) (PX_Cipher *pxc);
+	int			(*encrypt) (PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res);
+	int			(*decrypt) (PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res);
+	void		(*free) (PX_Cipher *pxc);
+
+	/* The mechanism describing the cipher used */
+	union
+	{
+		CK_MECHANISM_TYPE nss;
+		CK_ULONG internal;
+	}			mechanism;
+	int			keylen;
+	bool		is_nss;
+}			cipher_implementation;
+
+typedef struct nss_cipher
+{
+	const cipher_implementation *impl;
+	NSSInitContext *context;
+	PK11Context *crypt_context;
+	SECItem *params;
+
+	PK11SymKey *encrypt_key;
+	PK11SymKey *decrypt_key;
+}			nss_cipher;
+
+typedef struct internal_cipher
+{
+	const cipher_implementation *impl;
+	BlowfishContext	context;
+}			internal_cipher;
+
+typedef struct nss_cipher_ref
+{
+	const char *name;
+	const cipher_implementation *impl;
+} nss_cipher_ref;
+
+/*
+ * Prototypes
+ */
+static unsigned nss_get_iv_size(PX_Cipher *pxc);
+static unsigned nss_get_block_size(PX_Cipher *pxc);
+
+/*
+ * nss_GetHashOidTagByHashType
+ *
+ * Returns the corresponding SECOidTag for the passed hash type. NSS 3.43
+ * includes HASH_GetHashOidTagByHashType for this purpose, but at the time of
+ * writing is not commonly available so we need our own version till then.
+ */
+static SECOidTag
+nss_GetHashOidTagByHashType(HASH_HashType type)
+{
+	if (type == HASH_AlgMD2)
+		return SEC_OID_MD2;
+	if (type == HASH_AlgMD5)
+		return SEC_OID_MD5;
+	if (type == HASH_AlgSHA1)
+		return SEC_OID_SHA1;
+	if (type == HASH_AlgSHA224)
+		return SEC_OID_SHA224;
+	if (type == HASH_AlgSHA256)
+		return SEC_OID_SHA256;
+	if (type == HASH_AlgSHA384)
+		return SEC_OID_SHA384;
+	if (type == HASH_AlgSHA512)
+		return SEC_OID_SHA512;
+
+	return SEC_OID_UNKNOWN;
+}
+
+static unsigned
+nss_digest_block_size(PX_MD *pxmd)
+{
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+	const SECHashObject *object;
+
+	object = HASH_GetHashObject(digest->hash_type);
+	return object->blocklength;
+}
+
+static unsigned
+nss_digest_result_size(PX_MD *pxmd)
+{
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+	const SECHashObject *object;
+
+	object = HASH_GetHashObject(digest->hash_type);
+	return object->length;
+}
+
+static void
+nss_digest_free(PX_MD *pxmd)
+{
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+	PRBool	free_ctx = PR_TRUE;
+
+	PK11_DestroyContext(digest->hash_context, free_ctx);
+	NSS_ShutdownContext(digest->context);
+}
+
+static void
+nss_digest_update(PX_MD *pxmd, const uint8 *data, unsigned dlen)
+{
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+
+	PK11_DigestOp(digest->hash_context, data, dlen);
+}
+
+static void
+nss_digest_reset(PX_MD *pxmd)
+{
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+
+	PK11_DigestBegin(digest->hash_context);
+}
+
+static void
+nss_digest_finish(PX_MD *pxmd, uint8 *dst)
+{
+	unsigned int outlen;
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+	const SECHashObject *object;
+
+	object = HASH_GetHashObject(digest->hash_type);
+	PK11_DigestFinal(digest->hash_context, dst, &outlen, object->length);
+}
+
+int
+px_find_digest(const char *name, PX_MD **res)
+{
+	PX_MD	*pxmd;
+	NSSInitParameters params;
+	NSSInitContext *nss_context;
+	bool found = false;
+	nss_digest *digest;
+	SECStatus status;
+	SECOidData *hash;
+	HASH_HashType t;
+
+	/*
+	 * Initialize our own NSS context without a database backing it.
+	 */
+	memset(&params, 0, sizeof(params));
+	params.length = sizeof(params);
+	nss_context = NSS_InitContext("", "", "", "", &params,
+								  NSS_INIT_READONLY | NSS_INIT_NOCERTDB |
+								  NSS_INIT_NOMODDB | NSS_INIT_FORCEOPEN |
+								  NSS_INIT_NOROOTINIT | NSS_INIT_PK11RELOAD);
+
+	/*
+	 * There is no API function for looking up a digest algorithm from a name
+	 * string, but there is a publically accessible array which can be scanned
+	 * for the name.
+	 */
+	for (t = HASH_AlgNULL + 1; t < HASH_AlgTOTAL; t++)
+	{
+		SECOidTag 	hash_oid;
+		char *p;
+
+		hash_oid = nss_GetHashOidTagByHashType(t);
+
+		if (hash_oid == SEC_OID_UNKNOWN)
+			return PXE_NO_HASH;
+
+		hash = SECOID_FindOIDByTag(hash_oid);
+		if (pg_strcasecmp(hash->desc, name) == 0)
+		{
+			found = true;
+			break;
+		}
+
+		/*
+		 * NSS saves the algorithm names using SHA-xxx notation whereas
+		 * OpenSSL use SHAxxx. To make sure the user finds the requested
+		 * algorithm let's remove the dash and compare that spelling as well.
+		 */
+		if ((p = strchr(hash->desc, '-')) != NULL)
+		{
+			char tmp[12];
+
+			memcpy(tmp, hash->desc, p - hash->desc);
+			memcpy(tmp + (p - hash->desc), p + 1, strlen(hash->desc) - (p - hash->desc) + 1);
+			if (pg_strcasecmp(tmp, name) == 0)
+			{
+				found = true;
+				break;
+			}
+		}
+	}
+
+	if (!found)
+		return PXE_NO_HASH;
+
+	digest = palloc(sizeof(*digest));
+
+	digest->context = nss_context;
+	digest->hash_context = PK11_CreateDigestContext(hash->offset);
+	digest->hash_type = t;
+	if (digest->hash_context == NULL)
+	{
+		pfree(digest);
+		return -1;
+	}
+
+	status = PK11_DigestBegin(digest->hash_context);
+	if (status != SECSuccess)
+	{
+		PK11_DestroyContext(digest->hash_context, PR_TRUE);
+		pfree(digest);
+		return -1;
+	}
+
+	pxmd = palloc(sizeof(*pxmd));
+	pxmd->result_size = nss_digest_result_size;
+	pxmd->block_size = nss_digest_block_size;
+	pxmd->reset = nss_digest_reset;
+	pxmd->update = nss_digest_update;
+	pxmd->finish = nss_digest_finish;
+	pxmd->free = nss_digest_free;
+	pxmd->p.ptr = (void *) digest;
+
+	*res = pxmd;
+
+	return 0;
+}
+
+static int
+bf_init(PX_Cipher *pxc, const uint8 *key, unsigned klen, const uint8 *iv)
+{
+	internal_cipher *cipher = (internal_cipher *) pxc->ptr;
+
+	blowfish_setkey(&cipher->context, key, klen);
+	if (iv)
+		blowfish_setiv(&cipher->context, iv);
+
+	return 0;
+}
+
+static int
+bf_encrypt(PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res)
+{
+	internal_cipher *cipher = (internal_cipher *) pxc->ptr;
+	uint8 *buf;
+
+	if (dlen == 0)
+		return 0;
+
+	if (dlen & 7)
+		return PXE_NOTBLOCKSIZE;
+
+	buf = palloc(dlen);
+	memcpy(buf, data, dlen);
+
+	if (cipher->impl->mechanism.internal == BLOWFISH_ECB)
+		blowfish_encrypt_ecb(buf, dlen, &cipher->context);
+	else
+		blowfish_encrypt_cbc(buf, dlen, &cipher->context);
+
+	memcpy(res, buf, dlen);
+	pfree(buf);
+
+	return 0;
+}
+
+static int
+bf_decrypt(PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res)
+{
+	internal_cipher *cipher = (internal_cipher *) pxc->ptr;
+
+	if (dlen == 0)
+		return 0;
+
+	if (dlen & 7)
+		return PXE_NOTBLOCKSIZE;
+
+	memcpy(res, data, dlen);
+	if (cipher->impl->mechanism.internal == BLOWFISH_ECB)
+		blowfish_decrypt_ecb(res, dlen, &cipher->context);
+	else
+		blowfish_decrypt_cbc(res, dlen, &cipher->context);
+
+	return 0;
+}
+
+static void
+bf_free(PX_Cipher *pxc)
+{
+	internal_cipher *cipher = (internal_cipher *) pxc->ptr;
+
+	pfree(cipher);
+	pfree(pxc);
+}
+
+static int
+nss_symkey_blockcipher_init(PX_Cipher *pxc, const uint8 *key, unsigned klen,
+							const uint8 *iv)
+{
+	nss_cipher	   *cipher = (nss_cipher *) pxc->ptr;
+	SECItem			iv_item;
+	unsigned char  *iv_item_data;
+	SECItem			key_item;
+	int				keylen;
+	PK11SlotInfo   *slot;
+
+	if (cipher->impl->mechanism.nss == CKM_AES_CBC ||
+		cipher->impl->mechanism.nss == CKM_AES_ECB)
+	{
+		if (klen <= 128 / 8)
+			keylen = 128 / 8;
+		else if (klen <= 192 / 8)
+			keylen = 192 / 8;
+		else if (klen <= 256 / 8)
+			keylen = 256 / 8;
+		else
+			return PXE_CIPHER_INIT;
+	}
+	else
+		keylen = cipher->impl->keylen;
+
+	key_item.type = siBuffer;
+	key_item.data = (unsigned char *) key;
+	key_item.len = keylen;
+
+	/*
+	 * If hardware acceleration is configured in NSS one can theoretically get
+	 * a better slot by calling PK11_GetBestSlot() with the mechanism passed
+	 * to it. Unless there are complaints, using the simpler API will make
+	 * error handling easier though.
+	 */
+	slot = PK11_GetInternalSlot();
+	if (!slot)
+		return PXE_CIPHER_INIT;
+
+	/*
+	 * The key must be set up for the operation, and since we don't know at
+	 * this point whether we are asked to encrypt or decrypt we need to store
+	 * both versions.
+	 */
+	cipher->decrypt_key = PK11_ImportSymKey(slot, cipher->impl->mechanism.nss,
+											PK11_OriginUnwrap,
+											CKA_DECRYPT, &key_item,
+											NULL);
+	cipher->encrypt_key = PK11_ImportSymKey(slot, cipher->impl->mechanism.nss,
+											PK11_OriginUnwrap,
+											CKA_ENCRYPT, &key_item,
+											NULL);
+	PK11_FreeSlot(slot);
+
+	if (!cipher->decrypt_key || !cipher->encrypt_key)
+		return PXE_CIPHER_INIT;
+
+	if (iv)
+	{
+		iv_item.type = siBuffer;
+		iv_item.data = (unsigned char *) iv;
+		iv_item.len = nss_get_iv_size(pxc);
+	}
+	else
+	{
+		/*
+		 * The documentation states that either passing .data = 0; .len = 0;
+		 * in the iv_item, or NULL as iv_item, to PK11_ParamFromIV should be
+		 * done when IV is missing. That however leads to segfaults in the
+		 * library, the workaround that works in modern  library versions is
+		 * to pass in a keysized zeroed out IV.
+		 */
+		iv_item_data = palloc0(nss_get_iv_size(pxc));
+		iv_item.type = siBuffer;
+		iv_item.data = iv_item_data;
+		iv_item.len = nss_get_iv_size(pxc);
+	}
+
+	cipher->params = PK11_ParamFromIV(cipher->impl->mechanism.nss, &iv_item);
+
+	/* If we had to make a mock IV, free it once made into a param */
+	if (!iv)
+		pfree(iv_item_data);
+
+	if (cipher->params == NULL)
+		return PXE_CIPHER_INIT;
+
+	return 0;
+}
+
+static int
+nss_decrypt(PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res)
+{
+	nss_cipher *cipher = (nss_cipher *) pxc->ptr;
+	SECStatus	status;
+	int outlen;
+
+	if (!cipher->crypt_context)
+	{
+		cipher->crypt_context =
+			PK11_CreateContextBySymKey(cipher->impl->mechanism.nss, CKA_DECRYPT,
+									   cipher->decrypt_key, cipher->params);
+	}
+
+	status = PK11_CipherOp(cipher->crypt_context, res, &outlen, dlen, data, dlen);
+	if (status != SECSuccess)
+		return PXE_DECRYPT_FAILED;
+
+	return 0;
+}
+
+static int
+nss_encrypt(PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res)
+{
+	nss_cipher *cipher = (nss_cipher *) pxc->ptr;
+	SECStatus	status;
+	int outlen;
+
+	if (!cipher->crypt_context)
+	{
+		cipher->crypt_context =
+			PK11_CreateContextBySymKey(cipher->impl->mechanism.nss, CKA_ENCRYPT,
+									   cipher->decrypt_key, cipher->params);
+	}
+
+	status = PK11_CipherOp(cipher->crypt_context, res, &outlen, dlen, data, dlen);
+
+	if (status != SECSuccess)
+		return PXE_DECRYPT_FAILED;
+
+	return 0;
+}
+
+static void
+nss_free(PX_Cipher *pxc)
+{
+	nss_cipher *cipher = pxc->ptr;
+	PRBool		free_ctx = PR_TRUE;
+
+	PK11_FreeSymKey(cipher->encrypt_key);
+	PK11_FreeSymKey(cipher->decrypt_key);
+	PK11_DestroyContext(cipher->crypt_context, free_ctx);
+	NSS_ShutdownContext(cipher->context);
+	pfree(cipher);
+
+	pfree(pxc);
+}
+
+static unsigned
+nss_get_block_size(PX_Cipher *pxc)
+{
+	nss_cipher *cipher = pxc->ptr;
+
+	return PK11_GetBlockSize(cipher->impl->mechanism.nss, NULL);
+}
+
+static unsigned
+nss_get_key_size(PX_Cipher *pxc)
+{
+	nss_cipher *cipher = pxc->ptr;
+
+	return cipher->impl->keylen;
+}
+
+static unsigned
+nss_get_iv_size(PX_Cipher *pxc)
+{
+	nss_cipher *cipher = pxc->ptr;
+
+	return PK11_GetIVLength(cipher->impl->mechanism.nss);
+}
+
+static unsigned
+bf_get_block_size(PX_Cipher *pxc)
+{
+	return 8;
+}
+
+static unsigned
+bf_get_key_size(PX_Cipher *pxc)
+{
+	return 448 / 8;
+}
+
+static unsigned
+bf_get_iv_size(PX_Cipher *pxc)
+{
+	return 8;
+}
+
+/*
+ * Cipher Implementations
+ */
+static const cipher_implementation nss_des_cbc = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_DES_CBC,
+	.keylen = 8,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_des_ecb = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_DES_ECB,
+	.keylen = 8,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_des3_cbc = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_DES3_CBC,
+	.keylen = 24,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_des3_ecb = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_DES3_ECB,
+	.keylen = 24,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_aes_cbc = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_AES_CBC,
+	.keylen = 32,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_aes_ecb = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_AES_ECB,
+	.keylen = 32,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_bf_ecb = {
+	.init = bf_init,
+	.get_block_size = bf_get_block_size,
+	.get_key_size = bf_get_key_size,
+	.get_iv_size = bf_get_iv_size,
+	.encrypt = bf_encrypt,
+	.decrypt = bf_decrypt,
+	.free = bf_free,
+	.mechanism.internal = BLOWFISH_ECB,
+	.keylen = 56,
+	.is_nss = false
+};
+
+static const cipher_implementation nss_bf_cbc = {
+	.init = bf_init,
+	.get_block_size = bf_get_block_size,
+	.get_key_size = bf_get_key_size,
+	.get_iv_size = bf_get_iv_size,
+	.encrypt = bf_encrypt,
+	.decrypt = bf_decrypt,
+	.free = bf_free,
+	.mechanism.internal = BLOWFISH_CBC,
+	.keylen = 56,
+	.is_nss = false
+};
+
+/*
+ * Lookup table for finding the implementation based on a name. CAST5 as well
+ * as BLOWFISH are defined as cipher mechanisms in NSS but error out with
+ * SEC_ERROR_INVALID_ALGORITHM. Blowfish is implemented using the internal
+ * implementation while CAST5 isn't supported at all at this time,
+ */
+static const nss_cipher_ref nss_cipher_lookup[] = {
+	{"des", &nss_des_cbc},
+	{"des-cbc", &nss_des_cbc},
+	{"des-ecb", &nss_des_ecb},
+	{"des3-cbc", &nss_des3_cbc},
+	{"3des", &nss_des3_cbc},
+	{"3des-cbc", &nss_des3_cbc},
+	{"des3-ecb", &nss_des3_ecb},
+	{"3des-ecb", &nss_des3_ecb},
+	{"aes", &nss_aes_cbc},
+	{"aes-cbc", &nss_aes_cbc},
+	{"aes-ecb", &nss_aes_ecb},
+	{"rijndael", &nss_aes_cbc},
+	{"rijndael-cbc", &nss_aes_cbc},
+	{"rijndael-ecb", &nss_aes_ecb},
+	{"blowfish", &nss_bf_cbc},
+	{"blowfish-cbc", &nss_bf_cbc},
+	{"blowfish-ecb", &nss_bf_ecb},
+	{"bf", &nss_bf_cbc},
+	{"bf-cbc", &nss_bf_cbc},
+	{"bf-ecb", &nss_bf_ecb},
+	{NULL}
+};
+
+/*
+ * px_find_cipher
+ *
+ * Search for the requested cipher and see if there is support for it, and if
+ * so return an allocated object containing the playbook for how to encrypt
+ * and decrypt using the cipher.
+ */
+int
+px_find_cipher(const char *alias, PX_Cipher **res)
+{
+	const nss_cipher_ref *cipher_ref;
+	PX_Cipher  *px_cipher;
+	NSSInitParameters params;
+	NSSInitContext *nss_context;
+	nss_cipher	*cipher;
+	internal_cipher *int_cipher;
+
+	for (cipher_ref = nss_cipher_lookup; cipher_ref->name; cipher_ref++)
+	{
+		if (strcmp(cipher_ref->name, alias) == 0)
+			break;
+	}
+
+	if (!cipher_ref->name)
+		return PXE_NO_CIPHER;
+
+	/*
+	 * Fill in the PX_Cipher to pass back to PX describing the operations to
+	 * perform in order to use the cipher.
+	 */
+	px_cipher = palloc(sizeof(*px_cipher));
+	px_cipher->block_size = cipher_ref->impl->get_block_size;
+	px_cipher->key_size = cipher_ref->impl->get_key_size;
+	px_cipher->iv_size = cipher_ref->impl->get_iv_size;
+	px_cipher->free = cipher_ref->impl->free;
+	px_cipher->init = cipher_ref->impl->init;
+	px_cipher->encrypt = cipher_ref->impl->encrypt;
+	px_cipher->decrypt = cipher_ref->impl->decrypt;
+
+	/*
+	 * Set the private data, which is different for NSS and internal ciphers
+	 */
+	if (cipher_ref->impl->is_nss)
+	{
+		/*
+		 * Initialize our own NSS context without a database backing it. At
+		 * some point we might want to allow users to use stored keys in the
+		 * database rather than passing them via SELECT encrypt(), and then
+		 * this need to be changed to open a user specified database.
+		 */
+		memset(&params, 0, sizeof(params));
+		params.length = sizeof(params);
+		nss_context = NSS_InitContext("", "", "", "", &params,
+									  NSS_INIT_READONLY | NSS_INIT_NOCERTDB |
+									  NSS_INIT_NOMODDB | NSS_INIT_FORCEOPEN |
+									  NSS_INIT_NOROOTINIT | NSS_INIT_PK11RELOAD);
+
+		/* nss_cipher is the private state struct for the operation */
+		cipher = palloc(sizeof(*cipher));
+		cipher->context = nss_context;
+		cipher->impl = cipher_ref->impl;
+		cipher->crypt_context = NULL;
+
+		px_cipher->ptr = cipher;
+	}
+	else
+	{
+		int_cipher = palloc0(sizeof(*int_cipher));
+
+		int_cipher->impl = cipher_ref->impl;
+		px_cipher->ptr = int_cipher;
+	}
+
+	*res = px_cipher;
+	return 0;
+}
diff --git a/contrib/pgcrypto/openssl.c b/contrib/pgcrypto/openssl.c
index ed96e4ce53..5ebe213406 100644
--- a/contrib/pgcrypto/openssl.c
+++ b/contrib/pgcrypto/openssl.c
@@ -400,7 +400,7 @@ gen_ossl_encrypt(PX_Cipher *c, const uint8 *data, unsigned dlen,
 	}
 
 	if (!EVP_EncryptUpdate(od->evp_ctx, res, &outlen, data, dlen))
-		return PXE_ERR_GENERIC;
+		return PXE_ENCRYPT_FAILED;
 
 	return 0;
 }
diff --git a/contrib/pgcrypto/px.c b/contrib/pgcrypto/px.c
index 6a4681dae9..a243f575d3 100644
--- a/contrib/pgcrypto/px.c
+++ b/contrib/pgcrypto/px.c
@@ -58,6 +58,7 @@ static const struct error_desc px_err_list[] = {
 	{PXE_MCRYPT_INTERNAL, "mcrypt internal error"},
 	{PXE_NO_RANDOM, "Failed to generate strong random bits"},
 	{PXE_DECRYPT_FAILED, "Decryption failed"},
+	{PXE_ENCRYPT_FAILED, "Encryption failed"},
 	{PXE_PGP_CORRUPT_DATA, "Wrong key or corrupt data"},
 	{PXE_PGP_CORRUPT_ARMOR, "Corrupt ascii-armor"},
 	{PXE_PGP_UNSUPPORTED_COMPR, "Unsupported compression algorithm"},
diff --git a/contrib/pgcrypto/px.h b/contrib/pgcrypto/px.h
index 5487923edb..17d6f22498 100644
--- a/contrib/pgcrypto/px.h
+++ b/contrib/pgcrypto/px.h
@@ -61,6 +61,7 @@
 #define PXE_MCRYPT_INTERNAL			-16
 #define PXE_NO_RANDOM				-17
 #define PXE_DECRYPT_FAILED			-18
+#define PXE_ENCRYPT_FAILED			-19
 
 #define PXE_PGP_CORRUPT_DATA		-100
 #define PXE_PGP_CORRUPT_ARMOR		-101
diff --git a/contrib/postgres_fdw/expected/postgres_fdw.out b/contrib/postgres_fdw/expected/postgres_fdw.out
index 2d88d06358..984efc0d7e 100644
--- a/contrib/postgres_fdw/expected/postgres_fdw.out
+++ b/contrib/postgres_fdw/expected/postgres_fdw.out
@@ -8911,7 +8911,7 @@ DO $d$
     END;
 $d$;
 ERROR:  invalid option "password"
-HINT:  Valid options in this context are: service, passfile, channel_binding, connect_timeout, dbname, host, hostaddr, port, options, application_name, keepalives, keepalives_idle, keepalives_interval, keepalives_count, tcp_user_timeout, sslmode, sslcompression, sslcert, sslkey, sslrootcert, sslcrl, requirepeer, ssl_min_protocol_version, ssl_max_protocol_version, gssencmode, krbsrvname, gsslib, target_session_attrs, use_remote_estimate, fdw_startup_cost, fdw_tuple_cost, extensions, updatable, fetch_size
+HINT:  Valid options in this context are: service, passfile, channel_binding, connect_timeout, dbname, host, hostaddr, port, options, application_name, keepalives, keepalives_idle, keepalives_interval, keepalives_count, tcp_user_timeout, sslmode, sslcompression, sslcert, sslkey, sslrootcert, sslcrl, requirepeer, ssl_min_protocol_version, ssl_max_protocol_version, gssencmode, krbsrvname, gsslib, target_session_attrs, cert_database, use_remote_estimate, fdw_startup_cost, fdw_tuple_cost, extensions, updatable, fetch_size
 CONTEXT:  SQL statement "ALTER SERVER loopback_nopw OPTIONS (ADD password 'dummypw')"
 PL/pgSQL function inline_code_block line 3 at EXECUTE
 -- If we add a password for our user mapping instead, we should get a different
diff --git a/contrib/sslinfo/sslinfo.c b/contrib/sslinfo/sslinfo.c
index 5ba3988e27..84bb2c65b8 100644
--- a/contrib/sslinfo/sslinfo.c
+++ b/contrib/sslinfo/sslinfo.c
@@ -9,9 +9,11 @@
 
 #include "postgres.h"
 
+#ifdef USE_OPENSSL
 #include <openssl/x509.h>
 #include <openssl/x509v3.h>
 #include <openssl/asn1.h>
+#endif
 
 #include "access/htup_details.h"
 #include "funcapi.h"
@@ -21,8 +23,8 @@
 
 PG_MODULE_MAGIC;
 
+#ifdef USE_OPENSSL
 static Datum X509_NAME_field_to_text(X509_NAME *name, text *fieldName);
-static Datum X509_NAME_to_text(X509_NAME *name);
 static Datum ASN1_STRING_to_text(ASN1_STRING *str);
 
 /*
@@ -32,6 +34,7 @@ typedef struct
 {
 	TupleDesc	tupdesc;
 } SSLExtensionInfoContext;
+#endif
 
 /*
  * Indicates whether current session uses SSL
@@ -54,9 +57,16 @@ PG_FUNCTION_INFO_V1(ssl_version);
 Datum
 ssl_version(PG_FUNCTION_ARGS)
 {
-	if (MyProcPort->ssl == NULL)
+	const char *version;
+
+	if (!MyProcPort->ssl_in_use)
+		PG_RETURN_NULL();
+
+	version = be_tls_get_version(MyProcPort);
+	if (version == NULL)
 		PG_RETURN_NULL();
-	PG_RETURN_TEXT_P(cstring_to_text(SSL_get_version(MyProcPort->ssl)));
+
+	PG_RETURN_TEXT_P(cstring_to_text(version));
 }
 
 
@@ -67,9 +77,16 @@ PG_FUNCTION_INFO_V1(ssl_cipher);
 Datum
 ssl_cipher(PG_FUNCTION_ARGS)
 {
-	if (MyProcPort->ssl == NULL)
+	const char *cipher;
+
+	if (!MyProcPort->ssl_in_use)
 		PG_RETURN_NULL();
-	PG_RETURN_TEXT_P(cstring_to_text(SSL_get_cipher(MyProcPort->ssl)));
+
+	cipher = be_tls_get_cipher(MyProcPort);
+	if (cipher == NULL)
+		PG_RETURN_NULL();
+
+	PG_RETURN_TEXT_P(cstring_to_text(cipher));
 }
 
 
@@ -83,7 +100,7 @@ PG_FUNCTION_INFO_V1(ssl_client_cert_present);
 Datum
 ssl_client_cert_present(PG_FUNCTION_ARGS)
 {
-	PG_RETURN_BOOL(MyProcPort->peer != NULL);
+	PG_RETURN_BOOL(MyProcPort->peer_cert_valid);
 }
 
 
@@ -99,29 +116,26 @@ PG_FUNCTION_INFO_V1(ssl_client_serial);
 Datum
 ssl_client_serial(PG_FUNCTION_ARGS)
 {
+	char decimal[NAMEDATALEN];
 	Datum		result;
-	Port	   *port = MyProcPort;
-	X509	   *peer = port->peer;
-	ASN1_INTEGER *serial = NULL;
-	BIGNUM	   *b;
-	char	   *decimal;
 
-	if (!peer)
+	if (!MyProcPort->ssl_in_use || !MyProcPort->peer_cert_valid)
+		PG_RETURN_NULL();
+
+	be_tls_get_peer_serial(MyProcPort, decimal, NAMEDATALEN);
+
+	if (!*decimal)
 		PG_RETURN_NULL();
-	serial = X509_get_serialNumber(peer);
-	b = ASN1_INTEGER_to_BN(serial, NULL);
-	decimal = BN_bn2dec(b);
 
-	BN_free(b);
 	result = DirectFunctionCall3(numeric_in,
 								 CStringGetDatum(decimal),
 								 ObjectIdGetDatum(0),
 								 Int32GetDatum(-1));
-	OPENSSL_free(decimal);
 	return result;
 }
 
 
+#ifdef USE_OPENSSL
 /*
  * Converts OpenSSL ASN1_STRING structure into text
  *
@@ -228,7 +242,7 @@ ssl_client_dn_field(PG_FUNCTION_ARGS)
 	text	   *fieldname = PG_GETARG_TEXT_PP(0);
 	Datum		result;
 
-	if (!(MyProcPort->peer))
+	if (!MyProcPort->ssl_in_use || !MyProcPort->peer_cert_valid)
 		PG_RETURN_NULL();
 
 	result = X509_NAME_field_to_text(X509_get_subject_name(MyProcPort->peer), fieldname);
@@ -273,76 +287,23 @@ ssl_issuer_field(PG_FUNCTION_ARGS)
 	else
 		return result;
 }
+#endif							/* USE_OPENSSL */
 
-
-/*
- * Equivalent of X509_NAME_oneline that respects encoding
- *
- * This function converts X509_NAME structure to the text variable
- * converting all textual data into current database encoding.
- *
- * Parameter: X509_NAME *name X509_NAME structure to be converted
- *
- * Returns: text datum which contains string representation of
- * X509_NAME
- */
-static Datum
-X509_NAME_to_text(X509_NAME *name)
+#ifdef USE_NSS
+PG_FUNCTION_INFO_V1(ssl_client_dn_field);
+Datum
+ssl_client_dn_field(PG_FUNCTION_ARGS)
 {
-	BIO		   *membuf = BIO_new(BIO_s_mem());
-	int			i,
-				nid,
-				count = X509_NAME_entry_count(name);
-	X509_NAME_ENTRY *e;
-	ASN1_STRING *v;
-	const char *field_name;
-	size_t		size;
-	char		nullterm;
-	char	   *sp;
-	char	   *dp;
-	text	   *result;
-
-	if (membuf == NULL)
-		ereport(ERROR,
-				(errcode(ERRCODE_OUT_OF_MEMORY),
-				 errmsg("could not create OpenSSL BIO structure")));
-
-	(void) BIO_set_close(membuf, BIO_CLOSE);
-	for (i = 0; i < count; i++)
-	{
-		e = X509_NAME_get_entry(name, i);
-		nid = OBJ_obj2nid(X509_NAME_ENTRY_get_object(e));
-		if (nid == NID_undef)
-			ereport(ERROR,
-					(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
-					 errmsg("could not get NID for ASN1_OBJECT object")));
-		v = X509_NAME_ENTRY_get_data(e);
-		field_name = OBJ_nid2sn(nid);
-		if (field_name == NULL)
-			field_name = OBJ_nid2ln(nid);
-		if (field_name == NULL)
-			ereport(ERROR,
-					(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
-					 errmsg("could not convert NID %d to an ASN1_OBJECT structure", nid)));
-		BIO_printf(membuf, "/%s=", field_name);
-		ASN1_STRING_print_ex(membuf, v,
-							 ((ASN1_STRFLGS_RFC2253 & ~ASN1_STRFLGS_ESC_MSB)
-							  | ASN1_STRFLGS_UTF8_CONVERT));
-	}
-
-	/* ensure null termination of the BIO's content */
-	nullterm = '\0';
-	BIO_write(membuf, &nullterm, 1);
-	size = BIO_get_mem_data(membuf, &sp);
-	dp = pg_any_to_server(sp, size - 1, PG_UTF8);
-	result = cstring_to_text(dp);
-	if (dp != sp)
-		pfree(dp);
-	if (BIO_free(membuf) != 1)
-		elog(ERROR, "could not free OpenSSL BIO structure");
+	PG_RETURN_NULL();
+}
 
-	PG_RETURN_TEXT_P(result);
+PG_FUNCTION_INFO_V1(ssl_issuer_field);
+Datum
+ssl_issuer_field(PG_FUNCTION_ARGS)
+{
+	PG_RETURN_NULL();
 }
+#endif							/* USE_NSS */
 
 
 /*
@@ -358,9 +319,17 @@ PG_FUNCTION_INFO_V1(ssl_client_dn);
 Datum
 ssl_client_dn(PG_FUNCTION_ARGS)
 {
-	if (!(MyProcPort->peer))
+	char		subject[NAMEDATALEN];
+
+	if (!MyProcPort->ssl_in_use || !MyProcPort->peer_cert_valid)
+		PG_RETURN_NULL();
+
+	be_tls_get_peer_subject_name(MyProcPort, subject, NAMEDATALEN);
+
+	if (!*subject)
 		PG_RETURN_NULL();
-	return X509_NAME_to_text(X509_get_subject_name(MyProcPort->peer));
+
+	PG_RETURN_TEXT_P(cstring_to_text(subject));
 }
 
 
@@ -377,12 +346,21 @@ PG_FUNCTION_INFO_V1(ssl_issuer_dn);
 Datum
 ssl_issuer_dn(PG_FUNCTION_ARGS)
 {
-	if (!(MyProcPort->peer))
+	char		issuer[NAMEDATALEN];
+
+	if (!MyProcPort->ssl_in_use || !MyProcPort->peer_cert_valid)
+		PG_RETURN_NULL();
+
+	be_tls_get_peer_issuer_name(MyProcPort, issuer, NAMEDATALEN);
+
+	if (!*issuer)
 		PG_RETURN_NULL();
-	return X509_NAME_to_text(X509_get_issuer_name(MyProcPort->peer));
+
+	PG_RETURN_TEXT_P(cstring_to_text(issuer));
 }
 
 
+#ifdef USE_OPENSSL
 /*
  * Returns information about available SSL extensions.
  *
@@ -516,3 +494,13 @@ ssl_extension_info(PG_FUNCTION_ARGS)
 	/* All done */
 	SRF_RETURN_DONE(funcctx);
 }
+#endif							/* USE_OPENSSL */
+
+#ifdef USE_NSS
+PG_FUNCTION_INFO_V1(ssl_extension_info);
+Datum
+ssl_extension_info(PG_FUNCTION_ARGS)
+{
+	PG_RETURN_NULL();
+}
+#endif							/* USE_NSS */
diff --git a/doc/src/sgml/acronyms.sgml b/doc/src/sgml/acronyms.sgml
index 4e5ec983c0..4f6f0cf353 100644
--- a/doc/src/sgml/acronyms.sgml
+++ b/doc/src/sgml/acronyms.sgml
@@ -441,6 +441,28 @@
     </listitem>
    </varlistentry>
 
+   <varlistentry>
+    <term><acronym>NSPR</acronym></term>
+    <listitem>
+     <para>
+      <ulink
+      url="https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSPR">
+      Netscape Portable Runtime</ulink>
+     </para>
+    </listitem>
+   </varlistentry>
+
+   <varlistentry>
+    <term><acronym>NSS</acronym></term>
+    <listitem>
+     <para>
+      <ulink
+      url="https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS">
+      Network Security Services</ulink>
+     </para>
+    </listitem>
+   </varlistentry>
+
    <varlistentry>
     <term><acronym>ODBC</acronym></term>
     <listitem>
@@ -539,6 +561,17 @@
     </listitem>
    </varlistentry>
 
+   <varlistentry>
+    <term><acronym>PKCS#12</acronym></term>
+    <listitem>
+     <para>
+      <ulink
+      url="https://en.wikipedia.org/wiki/PKCS_12">
+      Public-Key Cryptography Standards #12</ulink>
+     </para>
+    </listitem>
+   </varlistentry>
+
    <varlistentry>
     <term><acronym>PL</acronym></term>
     <listitem>
@@ -684,6 +717,16 @@
     </listitem>
    </varlistentry>
 
+   <varlistentry>
+    <term><acronym>TLS</acronym></term>
+    <listitem>
+     <para>
+      <ulink url="https://sv.wikipedia.org/wiki/Transport_Layer_Security">
+      Transport Layer Security</ulink>
+     </para>
+    </listitem>
+   </varlistentry>
+
    <varlistentry>
     <term><acronym>TOAST</acronym></term>
     <listitem>
diff --git a/doc/src/sgml/config.sgml b/doc/src/sgml/config.sgml
index f043433e31..f7ae3b1be1 100644
--- a/doc/src/sgml/config.sgml
+++ b/doc/src/sgml/config.sgml
@@ -1208,6 +1208,23 @@ include_dir 'conf.d'
       </listitem>
      </varlistentry>
 
+     <varlistentry id="guc-ssl-database" xreflabel="ssl_database">
+      <term><varname>ssl_database</varname> (<type>string</type>)
+      <indexterm>
+       <primary><varname>ssl_database</varname> configuration parameter</primary>
+      </indexterm>
+      </term>
+      <listitem>
+       <para>
+        Specifies the name of the file containing the server certificates and
+        keys when using <productname>NSS</productname> for <acronym>SSL</acronym>
+        connections. This parameter can only be set in the
+        <filename>postgresql.conf</filename> file or on the server command
+        line.
+       </para>
+      </listitem>
+     </varlistentry>
+
      <varlistentry id="guc-ssl-ciphers" xreflabel="ssl_ciphers">
       <term><varname>ssl_ciphers</varname> (<type>string</type>)
       <indexterm>
@@ -1224,7 +1241,9 @@ include_dir 'conf.d'
         connections using TLS version 1.2 and lower are affected.  There is
         currently no setting that controls the cipher choices used by TLS
         version 1.3 connections.  The default value is
-        <literal>HIGH:MEDIUM:+3DES:!aNULL</literal>.  The default is usually a
+        <literal>HIGH:MEDIUM:+3DES:!aNULL</literal> for servers which have
+        been built with <productname>OpenSSL</productname> as the
+        <acronym>SSL</acronym> library.  The default is usually a
         reasonable choice unless you have specific security requirements.
        </para>
 
@@ -1426,8 +1445,11 @@ include_dir 'conf.d'
        <para>
         Sets an external command to be invoked when a passphrase for
         decrypting an SSL file such as a private key needs to be obtained.  By
-        default, this parameter is empty, which means the built-in prompting
-        mechanism is used.
+        default, this parameter is empty. When the server is using
+        <productname>OpenSSL</productname>, this means the built-in prompting
+        mechanism is used. When using <productname>NSS</productname>, there is
+        no default prompting so a blank callback will be used returning an
+        empty password.
        </para>
        <para>
         The command must print the passphrase to the standard output and exit
diff --git a/doc/src/sgml/installation.sgml b/doc/src/sgml/installation.sgml
index 0ac1cb9999..bd09124fb0 100644
--- a/doc/src/sgml/installation.sgml
+++ b/doc/src/sgml/installation.sgml
@@ -250,7 +250,7 @@ su - postgres
 
     <listitem>
      <para>
-      You need <productname>OpenSSL</productname>, if you want to support
+      You need a supported <acronym>SSL</acronym> library, if you want to support
       encrypted client connections.  <productname>OpenSSL</productname> is
       also required for random number generation on platforms that do not
       have <filename>/dev/urandom</filename> (except Windows).  The minimum
@@ -966,6 +966,31 @@ build-postgresql:
        </listitem>
       </varlistentry>
 
+      <varlistentry>
+       <term><option>--with-nss</option>
+       <indexterm>
+        <primary>NSS</primary>
+        <secondary>NSPR</secondary>
+        <seealso>SSL</seealso>
+       </indexterm>
+       </term>
+       <listitem>
+        <para>
+         Build with support for <acronym>SSL</acronym> (encrypted)
+         connections using <productname>NSS</productname>. This requires the
+         <productname>NSS</productname> package to be installed. Additionally,
+         <productname>NSS</productname> requires <productname>NSPR</productname>
+         to be installed. <filename>configure</filename> will check for the
+         required header files and libraries to make sure that your
+         <productname>NSS</productname> installation is sufficient before
+         proceeding.
+        </para>
+        <para>
+         This option is incompatible with <literal>--with-openssl</literal>.
+        </para>
+       </listitem>
+      </varlistentry>
+
       <varlistentry>
        <term><option>--with-openssl</option>
        <indexterm>
@@ -982,6 +1007,9 @@ build-postgresql:
          your <productname>OpenSSL</productname> installation is sufficient
          before proceeding.
         </para>
+        <para>
+         This option is incompatible with <literal>--with-nss</literal>.
+        </para>
        </listitem>
       </varlistentry>
 
diff --git a/doc/src/sgml/libpq.sgml b/doc/src/sgml/libpq.sgml
index 9ce32fb39b..61d9082052 100644
--- a/doc/src/sgml/libpq.sgml
+++ b/doc/src/sgml/libpq.sgml
@@ -2459,6 +2459,8 @@ void *PQsslStruct(const PGconn *conn, const char *struct_name);
       </para>
       <para>
        The struct(s) available depend on the SSL implementation in use.
+      </para>
+      <para>
        For <productname>OpenSSL</productname>, there is one struct,
        available under the name "OpenSSL", and it returns a pointer to the
        <productname>OpenSSL</productname> <literal>SSL</literal> struct.
@@ -2482,9 +2484,14 @@ void *PQsslStruct(const PGconn *conn, const char *struct_name);
 ]]></programlisting>
       </para>
       <para>
-       This structure can be used to verify encryption levels, check server
-       certificates, and more. Refer to the <productname>OpenSSL</productname>
-       documentation for information about this structure.
+       For <productname>NSS</productname>, there is one struct available under
+       the name "NSS", and it returns a pointer to the
+       <productname>NSS</productname> <literal>PRFileDesc</literal>.
+      </para>
+      <para>
+       These structures can be used to verify encryption levels, check server
+       certificates, and more. Refer to the <acronym>SSL</acronym> library
+       documentation for information about these structures.
       </para>
      </listitem>
     </varlistentry>
@@ -2511,6 +2518,10 @@ void *PQgetssl(const PGconn *conn);
        <xref linkend="libpq-PQsslInUse"/> instead, and for more details about the
        connection, use <xref linkend="libpq-PQsslAttribute"/>.
       </para>
+      <para>
+       This function returns <literal>NULL</literal> when <acronym>SSL</acronym>
+       librariaes other than <productname>OpenSSL</productname> are used.
+      </para>
      </listitem>
     </varlistentry>
 
@@ -7943,6 +7954,11 @@ void PQinitOpenSSL(int do_ssl, int do_crypto);
        before first opening a database connection.  Also be sure that you
        have done that initialization before opening a database connection.
       </para>
+
+      <para>
+       This function does nothing when using <productname>NSS</productname> as
+       the <acronym>SSL</acronym> library.
+      </para>
      </listitem>
     </varlistentry>
 
@@ -7969,6 +7985,11 @@ void PQinitSSL(int do_ssl);
        might be preferable for applications that need to work with older
        versions of <application>libpq</application>.
       </para>
+
+      <para>
+       This function does nothing when using <productname>NSS</productname> as
+       the <acronym>SSL</acronym> library.
+      </para>
      </listitem>
     </varlistentry>
    </variablelist>
diff --git a/doc/src/sgml/pgcrypto.sgml b/doc/src/sgml/pgcrypto.sgml
index 8748c64e2d..f03e1f5fcf 100644
--- a/doc/src/sgml/pgcrypto.sgml
+++ b/doc/src/sgml/pgcrypto.sgml
@@ -45,8 +45,9 @@ digest(data bytea, type text) returns bytea
     <literal>sha224</literal>, <literal>sha256</literal>,
     <literal>sha384</literal> and <literal>sha512</literal>.
     If <filename>pgcrypto</filename> was built with
-    <productname>OpenSSL</productname>, more algorithms are available, as
-    detailed in <xref linkend="pgcrypto-with-without-openssl"/>.
+    <productname>OpenSSL</productname> or <productname>NSS</productname>,
+    more algorithms are available, as
+    detailed in <xref linkend="pgcrypto-with-without-openssl-nss"/>.
    </para>
 
    <para>
@@ -763,7 +764,7 @@ pgp_sym_encrypt(data, psw, 'compress-algo=1, cipher-algo=aes256')
     Which cipher algorithm to use.
    </para>
 <literallayout>
-Values: bf, aes128, aes192, aes256 (OpenSSL-only: <literal>3des</literal>, <literal>cast5</literal>)
+Values: bf, aes128, aes192, aes256 (OpenSSL-only: <literal>3des</literal>, <literal>cast5</literal>; NSS-only: <literal>3des</literal>)
 Default: aes128
 Applies to: pgp_sym_encrypt, pgp_pub_encrypt
 </literallayout>
@@ -1152,8 +1153,8 @@ gen_random_uuid() returns uuid
    <para>
     <filename>pgcrypto</filename> configures itself according to the findings of the
     main PostgreSQL <literal>configure</literal> script.  The options that
-    affect it are <literal>--with-zlib</literal> and
-    <literal>--with-openssl</literal>.
+    affect it are <literal>--with-zlib</literal>,
+    <literal>--with-openssl</literal> and <literal>--with-nss</literal>.
    </para>
 
    <para>
@@ -1168,14 +1169,16 @@ gen_random_uuid() returns uuid
     BIGNUM functions.
    </para>
 
-   <table id="pgcrypto-with-without-openssl">
-    <title>Summary of Functionality with and without OpenSSL</title>
-    <tgroup cols="3">
+   <table id="pgcrypto-with-without-openssl-nss">
+    <title>Summary of Functionality with and without external cryptographic
+      library</title>
+    <tgroup cols="4">
      <thead>
       <row>
        <entry>Functionality</entry>
        <entry>Built-in</entry>
        <entry>With OpenSSL</entry>
+       <entry>With NSS</entry>
       </row>
      </thead>
      <tbody>
@@ -1183,51 +1186,67 @@ gen_random_uuid() returns uuid
        <entry>MD5</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>SHA1</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>SHA224/256/384/512</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>Other digest algorithms</entry>
        <entry>no</entry>
        <entry>yes (Note 1)</entry>
+       <entry>yes (Note 1)</entry>
       </row>
       <row>
        <entry>Blowfish</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>AES</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>DES/3DES/CAST5</entry>
        <entry>no</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
+      </row>
+      <row>
+       <entry>CAST5</entry>
+       <entry>no</entry>
+       <entry>yes</entry>
+       <entry>no</entry>
       </row>
       <row>
        <entry>Raw encryption</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>PGP Symmetric encryption</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>PGP Public-Key encryption</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
      </tbody>
     </tgroup>
@@ -1240,7 +1259,8 @@ gen_random_uuid() returns uuid
    <orderedlist>
     <listitem>
      <para>
-      Any digest algorithm <productname>OpenSSL</productname> supports
+      Any digest algorithm <productname>OpenSSL</productname> and
+      <productname>NSS</productname> supports
       is automatically picked up.
       This is not possible with ciphers, which need to be supported
       explicitly.
diff --git a/doc/src/sgml/runtime.sgml b/doc/src/sgml/runtime.sgml
index 17e938148c..fe7e305b75 100644
--- a/doc/src/sgml/runtime.sgml
+++ b/doc/src/sgml/runtime.sgml
@@ -2183,15 +2183,21 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
 
   <indexterm zone="ssl-tcp">
    <primary>SSL</primary>
+   <secondary>TLS</secondary>
   </indexterm>
 
   <para>
    <productname>PostgreSQL</productname> has native support for using
    <acronym>SSL</acronym> connections to encrypt client/server communications
    for increased security. This requires that
-   <productname>OpenSSL</productname> is installed on both client and
+   a supported TLS library is installed on both client and
    server systems and that support in <productname>PostgreSQL</productname> is
    enabled at build time (see <xref linkend="installation"/>).
+   Supported libraries are <productname>OpenSSL</productname> and
+   <productname>NSS</productname>. The terms <acronym>SSL</acronym> and
+   <acronym>TLS</acronym> are often used interchangeably to mean a secure
+   connection using a <acronym>TLS</acronym> protocol, even though
+   <acronym>SSL</acronym> protocols are no longer supported.
   </para>
 
   <sect2 id="ssl-setup">
@@ -2211,8 +2217,13 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
   </para>
 
   <para>
-   To start in <acronym>SSL</acronym> mode, files containing the server certificate
-   and private key must exist.  By default, these files are expected to be
+   To start in <acronym>SSL</acronym> mode, a server certificate
+   and private key must exist. The below sections on the different libraries
+   will discuss how to configure these.
+  </para>
+   
+  <para>
+   By default, these files are expected to be
    named <filename>server.crt</filename> and <filename>server.key</filename>, respectively, in
    the server's data directory, but other names and locations can be specified
    using the configuration parameters <xref linkend="guc-ssl-cert-file"/>
@@ -2302,6 +2313,18 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
   </note>
   </sect2>
 
+  <sect2 id="ssl-nss-config">
+   <title>NSS Configuration</title>
+
+  <para>
+   <productname>PostgreSQL</productname> will look for certificates and keys
+   in the <productname>NSS</productname> database specified by the parameter
+   <xref linkend="guc-ssl-database"/> in <filename>postgresql.conf</filename>.
+   The paramaters for certificate and key filenames are used to identify the
+   nicknames in the database.
+  </para>
+  </sect2>
+
   <sect2 id="ssl-client-certificates">
    <title>Using Client Certificates</title>
 
@@ -2376,7 +2399,7 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
   </sect2>
 
   <sect2 id="ssl-server-files">
-   <title>SSL Server File Usage</title>
+   <title>SSL Server File Parameter Usage</title>
 
    <para>
     <xref linkend="ssl-file-usage"/> summarizes the files that are
@@ -2423,6 +2446,14 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
       <entry>client certificate must not be on this list</entry>
      </row>
 
+     <row>
+      <entry><xref linkend="guc-ssl-database"/></entry>
+      <entry>certificate database</entry>
+      <entry>contains server certificates, keys and revocation lists; only
+      used when <productname>PostgreSQL</productname> is built with support
+      for <productname>NSS</productname>.</entry>
+     </row>
+
     </tbody>
    </tgroup>
   </table>
@@ -2550,6 +2581,45 @@ openssl x509 -req -in server.csr -text -days 365 \
    </para>
   </sect2>
 
+  <sect2 id="nss-certificate-database">
+   <title>NSS Certificate Databases</title>
+
+   <para>
+    When using <productname>NSS</productname>, all certificates and keys must
+    be loaded into an <productname>NSS</productname> certificate database.
+   </para>
+
+   <para>
+    To create a new <productname>NSS</productname> certificate database and
+    load the certificates created in <xref linkend="ssl-certificate-creation" />,
+    use the following <productname>NSS</productname> commands:
+<programlisting>
+certutil -d "sql:server.db" -N --empty-password
+certutil -d "sql:server.db" -A -n server.crt -i server.crt -t "CT,C,C"
+certutil -d "sql:server.db" -A -n root.crt -i root.crt -t "CT,C,C"
+</programlisting>
+    This will give the certificate the filename as the nickname identifier in
+    the database which is created as <filename>server.db</filename>.
+   </para>
+   <para>
+    Then load the server key, which require converting it to
+    <acronym>PKCS#12</acronym> format using the
+    <productname>OpenSSL</productname> tools:
+<programlisting>
+openssl pkcs12 -export -out server.pfx -inkey server.key -in server.crt \
+  -certfile root.crt -passout pass:
+pk12util -i server.pfx -d server.db -W ''
+</programlisting>
+   </para>
+   <para>
+    Finally a certificate revocation list can be loaded with the following
+    commands:
+<programlisting>
+crlutil -I -i server.crl -d server.db -B
+</programlisting>
+   </para>
+  </sect2>
+
  </sect1>
 
  <sect1 id="gssapi-enc">
diff --git a/doc/src/sgml/sslinfo.sgml b/doc/src/sgml/sslinfo.sgml
index e16f61b41d..253bb697af 100644
--- a/doc/src/sgml/sslinfo.sgml
+++ b/doc/src/sgml/sslinfo.sgml
@@ -22,7 +22,8 @@
 
  <para>
   This extension won't build at all unless the installation was
-  configured with <literal>--with-openssl</literal>.
+  configured with SSL support, such as <literal>--with-openssl</literal>
+  or <literal>--with-nss</literal>.
  </para>
 
  <sect2>
@@ -54,7 +55,7 @@
     <listitem>
     <para>
      Returns the name of the protocol used for the SSL connection (e.g., TLSv1.0
-     TLSv1.1, or TLSv1.2).
+     TLSv1.1, TLSv1.2 or TLSv1.3).
     </para>
     </listitem>
    </varlistentry>
@@ -208,6 +209,9 @@ emailAddress
      the X.500 and X.509 standards, so you cannot just assign arbitrary
      meaning to them.
     </para>
+    <para>
+     This function is only available when using <productname>OpenSSL</productname>.
+    </para>
     </listitem>
    </varlistentry>
 
@@ -223,6 +227,9 @@ emailAddress
      Same as <function>ssl_client_dn_field</function>, but for the certificate issuer
      rather than the certificate subject.
     </para>
+    <para>
+     This function is only available when using <productname>OpenSSL</productname>.
+    </para>
     </listitem>
    </varlistentry>
 
@@ -238,6 +245,9 @@ emailAddress
      Provide information about extensions of client certificate: extension name,
      extension value, and if it is a critical extension.
     </para>
+    <para>
+     This function is only available when using <productname>OpenSSL</productname>.
+    </para>
     </listitem>
    </varlistentry>
   </variablelist>
diff --git a/src/Makefile.global.in b/src/Makefile.global.in
index 7ca1e9aac5..8946fa696a 100644
--- a/src/Makefile.global.in
+++ b/src/Makefile.global.in
@@ -184,6 +184,7 @@ with_perl	= @with_perl@
 with_python	= @with_python@
 with_tcl	= @with_tcl@
 with_openssl	= @with_openssl@
+with_nss        = @with_nss@
 with_readline	= @with_readline@
 with_selinux	= @with_selinux@
 with_systemd	= @with_systemd@
@@ -232,6 +233,15 @@ CLANG = @CLANG@
 BITCODE_CFLAGS = @BITCODE_CFLAGS@
 BITCODE_CXXFLAGS = @BITCODE_CXXFLAGS@
 
+ifeq ($(with_openssl),yes)
+with_ssl = yes
+else ifeq ($(with_nss),yes)
+with_ssl = yes
+else
+with_ssl = no
+endif
+
+
 ##########################################################################
 #
 # Programs and flags
diff --git a/src/backend/libpq/Makefile b/src/backend/libpq/Makefile
index efc5ef760a..191266a426 100644
--- a/src/backend/libpq/Makefile
+++ b/src/backend/libpq/Makefile
@@ -30,6 +30,10 @@ OBJS = \
 
 ifeq ($(with_openssl),yes)
 OBJS += be-secure-openssl.o
+else
+ifeq ($(with_nss),yes)
+OBJS += be-secure-nss.o
+endif
 endif
 
 ifeq ($(with_gssapi),yes)
diff --git a/src/backend/libpq/auth.c b/src/backend/libpq/auth.c
index d132c5cb48..d476101583 100644
--- a/src/backend/libpq/auth.c
+++ b/src/backend/libpq/auth.c
@@ -2870,7 +2870,14 @@ CheckCertAuth(Port *port)
 {
 	int			status_check_usermap = STATUS_ERROR;
 
+#if defined(USE_OPENSSL)
 	Assert(port->ssl);
+#elif defined(USE_NSS)
+	/* TODO: should we rename pr_fd to ssl, to keep consistency? */
+	Assert(port->pr_fd);
+#else
+	Assert(false);
+#endif
 
 	/* Make sure we have received a username in the certificate */
 	if (port->peer_cn == NULL ||
diff --git a/src/backend/libpq/be-secure-nss.c b/src/backend/libpq/be-secure-nss.c
new file mode 100644
index 0000000000..2b184be3d1
--- /dev/null
+++ b/src/backend/libpq/be-secure-nss.c
@@ -0,0 +1,1175 @@
+/*-------------------------------------------------------------------------
+ *
+ * be-secure-nss.c
+ *	  functions for supporting NSS as a TLS backend
+ *
+ *
+ * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ *	  src/backend/libpq/be-secure-nss.c
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#include "postgres.h"
+
+#include <sys/stat.h>
+
+/*
+ * BITS_PER_BYTE is also defined in the NSPR header files, so we need to undef
+ * our version to avoid compiler warnings on redefinition.
+ */
+#define pg_BITS_PER_BYTE BITS_PER_BYTE
+#undef BITS_PER_BYTE
+
+/*
+ * The nspr/obsolete/protypes.h NSPR header typedefs uint64 and int64 with
+ * colliding definitions from ours, causing a much expected compiler error.
+ * Remove backwards compatibility with ancient NSPR versions to avoid this.
+ */
+#define NO_NSPR_10_SUPPORT
+#include <nspr/nspr.h>
+#include <nspr/prerror.h>
+#include <nspr/prio.h>
+#include <nspr/prmem.h>
+#include <nspr/prtypes.h>
+
+#include <nss/nss.h>
+#include <nss/base64.h>
+#include <nss/cert.h>
+#include <nss/certdb.h>
+#include <nss/keyhi.h>
+#include <nss/pk11pub.h>
+#include <nss/secder.h>
+#include <nss/secerr.h>
+#include <nss/secitem.h>
+#include <nss/secport.h>
+#include <nss/ssl.h>
+#include <nss/sslerr.h>
+#include <nss/sslproto.h>
+
+/*
+ * Ensure that the colliding definitions match, else throw an error. In case
+ * NSPR has removed the definition for some reason, make sure to put ours
+ * back again.
+ */
+#if defined(BITS_PER_BYTE)
+#if BITS_PER_BYTE != pg_BITS_PER_BYTE
+#error "incompatible byte widths between NSPR and postgres"
+#endif
+#else
+#define BITS_PER_BYTE pg_BITS_PER_BYTE
+#endif
+#undef pg_BITS_PER_BYTE
+
+#include "common/pg_nss.h"
+#include "lib/stringinfo.h"
+#include "libpq/libpq.h"
+#include "nodes/pg_list.h"
+#include "miscadmin.h"
+#include "storage/fd.h"
+#include "utils/guc.h"
+#include "utils/memutils.h"
+
+
+/* default init hook can be overridden by a shared library */
+static void default_nss_tls_init(bool isServerStart);
+nss_tls_init_hook_type nss_tls_init_hook = default_nss_tls_init;
+
+static PRDescIdentity pr_id;
+
+static PRIOMethods pr_iomethods;
+static NSSInitContext * nss_context = NULL;
+static SSLVersionRange desired_sslver;
+
+static char *external_ssl_passphrase_cb(PK11SlotInfo *slot, PRBool retry, void *arg);
+static bool dummy_ssl_passwd_cb_called = false;
+static bool ssl_is_server_start;
+
+/*
+ * PR_ImportTCPSocket() is a private API, but very widely used, as it's the
+ * only way to make NSS use an already set up POSIX file descriptor rather
+ * than opening one itself. To quote the NSS documentation:
+ *
+ *		"In theory, code that uses PR_ImportTCPSocket may break when NSPR's
+ *		implementation changes. In practice, this is unlikely to happen because
+ *		NSPR's implementation has been stable for years and because of NSPR's
+ *		strong commitment to backward compatibility."
+ *
+ * https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSPR/Reference/PR_ImportTCPSocket
+ *
+ * The function is declared in <private/pprio.h>, but as it is a header marked
+ * private we declare it here rather than including it.
+ */
+NSPR_API(PRFileDesc *) PR_ImportTCPSocket(int);
+
+/* NSS IO layer callback overrides */
+static PRInt32 pg_ssl_read(PRFileDesc * fd, void *buf, PRInt32 amount,
+						   PRIntn flags, PRIntervalTime timeout);
+static PRInt32 pg_ssl_write(PRFileDesc * fd, const void *buf, PRInt32 amount,
+							PRIntn flags, PRIntervalTime timeout);
+/* Utility functions */
+static PRFileDesc * init_iolayer(Port *port);
+static uint16 ssl_protocol_version_to_nss(int v, const char *guc_name);
+
+static char *pg_SSLerrmessage(PRErrorCode errcode);
+static char *ssl_protocol_version_to_string(int v);
+static SECStatus pg_cert_auth_handler(void *arg, PRFileDesc * fd,
+									  PRBool checksig, PRBool isServer);
+static SECStatus pg_bad_cert_handler(void *arg, PRFileDesc * fd);
+static char *dummy_ssl_passphrase_cb(PK11SlotInfo * slot, PRBool retry, void *arg);
+
+/* ------------------------------------------------------------ */
+/*						 Public interface						*/
+/* ------------------------------------------------------------ */
+
+/*
+ * be_tls_init
+ *			Initialize the nss TLS library in the postmaster
+ *
+ * The majority of the setup needs to happen in be_tls_open_server since the
+ * NSPR initialization must happen after the forking of the backend. We could
+ * potentially move some parts in under !isServerStart, but so far this is the
+ * separation chosen.
+ */
+int
+be_tls_init(bool isServerStart)
+{
+	SECStatus	status;
+	SSLVersionRange supported_sslver;
+
+	/*
+	 * Set up the connection cache for multi-processing application behavior.
+	 * If we are in ServerStart then we initialize the cache. If the server is
+	 * already started, we inherit the cache such that it can be used for
+	 * connections. Calling SSL_ConfigMPServerSIDCache sets an environment
+	 * variable which contains enough information for the forked child to know
+	 * how to access it.  Passing NULL to SSL_InheritMPServerSIDCache will
+	 * make the forked child look it up by the default name SSL_INHERITANCE,
+	 * if env vars aren't inherited then the contents of the variable can be
+	 * passed instead.
+	 */
+	if (isServerStart)
+	{
+		/*
+		 * SSLv2 and SSLv3 are disabled in this TLS backend, but when setting
+		 * up the required session cache for NSS we still must supply timeout
+		 * values for v2 and The minimum allowed value for both is 5 seconds,
+		 * so opt for that in both cases (the defaults being 100 seconds and
+		 * 24 hours).
+		 *
+		 * Passing NULL as the directory for the session cache will default to
+		 * using /tmp on UNIX and \\temp on Windows.  Deciding if we want to
+		 * keep closer control on this directory is left as a TODO.
+		 */
+		status = SSL_ConfigMPServerSIDCache(MaxConnections, 5, 5, NULL);
+		if (status != SECSuccess)
+			ereport(FATAL,
+					(errmsg("unable to set up TLS connection cache: %s",
+							pg_SSLerrmessage(PR_GetError()))));
+
+	}
+	else
+	{
+		status = SSL_InheritMPServerSIDCache(NULL);
+		if (status != SECSuccess)
+		{
+			ereport(LOG,
+					(errmsg("unable to connect to TLS connection cache: %s",
+							pg_SSLerrmessage(PR_GetError()))));
+			return -1;
+		}
+	}
+
+	if (!ssl_database || strlen(ssl_database) == 0)
+	{
+		ereport(isServerStart ? FATAL : LOG,
+				(errmsg("no certificate database specified")));
+		goto error;
+	}
+
+	/*
+	 * We check for the desired TLS version range here, even though we cannot
+	 * set it until be_open_server such that we can be compatible with how the
+	 * OpenSSL backend reports errors for incompatible range configurations.
+	 * Set either the default supported TLS version range, or the configured
+	 * range from ssl_min_protocol_version and ssl_max_protocol version. In
+	 * case the user hasn't defined the maximum allowed version we fall back
+	 * to the highest version TLS that the library supports.
+	 */
+	if (SSL_VersionRangeGetSupported(ssl_variant_stream, &supported_sslver) != SECSuccess)
+	{
+		ereport(isServerStart ? FATAL : LOG,
+				(errmsg("unable to get default protocol support from NSS")));
+		goto error;
+	}
+
+	/*
+	 * Set the fallback versions for the TLS protocol version range to a
+	 * combination of our minimal requirement and the library maximum.
+	 */
+	desired_sslver.min = SSL_LIBRARY_VERSION_TLS_1_0;
+	desired_sslver.max = supported_sslver.max;
+
+	if (ssl_min_protocol_version)
+	{
+		int			ver = ssl_protocol_version_to_nss(ssl_min_protocol_version,
+													  "ssl_min_protocol_version");
+
+		if (ver == -1)
+		{
+			ereport(isServerStart ? FATAL : LOG,
+					(errmsg("\"%s\" setting \"%s\" not supported by this build",
+							"ssl_min_protocol_version",
+							GetConfigOption("ssl_min_protocol_version",
+											false, false))));
+			goto error;
+		}
+
+		if (ver > 0)
+			desired_sslver.min = ver;
+	}
+
+	if (ssl_max_protocol_version)
+	{
+		int			ver = ssl_protocol_version_to_nss(ssl_max_protocol_version,
+													  "ssl_max_protocol_version");
+
+		if (ver == -1)
+		{
+			ereport(isServerStart ? FATAL : LOG,
+					(errmsg("\"%s\" setting \"%s\" not supported by this build",
+							"ssl_max_protocol_version",
+							GetConfigOption("ssl_max_protocol_version",
+											false, false))));
+			goto error;
+		}
+		if (ver > 0)
+			desired_sslver.max = ver;
+
+		if (ver < desired_sslver.min)
+		{
+			ereport(isServerStart ? FATAL : LOG,
+					(errmsg("could not set SSL protocol version range"),
+					 errdetail("\"%s\" cannot be higher than \"%s\"",
+							   "ssl_min_protocol_version",
+							   "ssl_max_protocol_version")));
+			goto error;
+		}
+	}
+
+	/*
+	 * Set the passphrase callback which will be used both to obtain the
+	 * passphrase from the user, as well as by NSS to obtain the phrase
+	 * repeatedly.
+	 */
+	ssl_is_server_start = isServerStart;
+	(*nss_tls_init_hook) (isServerStart);
+
+	return 0;
+error:
+	return -1;
+}
+
+int
+be_tls_open_server(Port *port)
+{
+	SECStatus	status;
+	PRFileDesc *model;
+	PRFileDesc *pr_fd;
+	PRFileDesc *layer;
+	CERTCertificate *server_cert;
+	SECKEYPrivateKey *private_key;
+	CERTSignedCrl *crl;
+	SECItem		crlname;
+	char	   *cert_database;
+	NSSInitParameters params;
+
+	/*
+	 * The NSPR documentation states that runtime initialization via PR_Init
+	 * is no longer required, as the first caller into NSPR will perform the
+	 * initialization implicitly. The documentation doesn't however clarify
+	 * from which version this is holds true, so let's perform the potentially
+	 * superfluous initialization anyways to avoid crashing on older versions
+	 * of NSPR, as there is no difference in overhead.  The NSS documentation
+	 * still states that PR_Init must be called in some way (implicitly or
+	 * explicitly).
+	 *
+	 * The below parameters are what the implicit initialization would've done
+	 * for us, and should work even for older versions where it might not be
+	 * done automatically. The last parameter, maxPTDs, is set to various
+	 * values in other codebases, but has been unused since NSPR 2.1 which was
+	 * released sometime in 1998. In current versions of NSPR all parameters
+	 * are ignored.
+	 */
+	PR_Init(PR_USER_THREAD, PR_PRIORITY_NORMAL, 0 /* maxPTDs */ );
+
+	/*
+	 * The certificate path (configdir) must contain a valid NSS database. If
+	 * the certificate path isn't a valid directory, NSS will fall back on the
+	 * system certificate database. If the certificate path is a directory but
+	 * is empty then the initialization will fail. On the client side this can
+	 * be allowed for any sslmode but the verify-xxx ones.
+	 * https://bugzilla.redhat.com/show_bug.cgi?id=728562 For the server side
+	 * we wont allow this to fail however, as we require the certificate and
+	 * key to exist.
+	 *
+	 * The original design of NSS was for a single application to use a single
+	 * copy of it, initialized with NSS_Initialize() which isn't returning any
+	 * handle with which to refer to NSS. NSS initialization and shutdown are
+	 * global for the application, so a shutdown in another NSS enabled
+	 * library would cause NSS to be stopped for libpq as well.  The fix has
+	 * been to introduce NSS_InitContext which returns a context handle to
+	 * pass to NSS_ShutdownContext.  NSS_InitContext was introduced in NSS
+	 * 3.12, but the use of it is not very well documented.
+	 * https://bugzilla.redhat.com/show_bug.cgi?id=738456
+	 *
+	 * The InitParameters struct passed can be used to override internal
+	 * values in NSS, but the usage is not documented at all. When using
+	 * NSS_Init initializations, the values are instead set via PK11_Configure
+	 * calls so the PK11_Configure documentation can be used to glean some
+	 * details on these.
+	 *
+	 * https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS/PKCS11/Module_Specs
+	 */
+	memset(&params, '\0', sizeof(params));
+	params.length = sizeof(params);
+
+	if (!ssl_database || strlen(ssl_database) == 0)
+		ereport(FATAL,
+				(errmsg("no certificate database specified")));
+
+	cert_database = psprintf("sql:%s", ssl_database);
+	nss_context = NSS_InitContext(cert_database, "", "", "",
+								  &params,
+								  NSS_INIT_READONLY | NSS_INIT_PK11RELOAD);
+	pfree(cert_database);
+
+	if (!nss_context)
+		ereport(FATAL,
+				(errmsg("unable to read certificate database \"%s\": %s",
+						ssl_database, pg_SSLerrmessage(PR_GetError()))));
+
+	/*
+	 * Import the already opened socket as we don't want to use NSPR functions
+	 * for opening the network socket due to how the PostgreSQL protocol works
+	 * with TLS connections. This function is not part of the NSPR public API,
+	 * see the comment at the top of the file for the rationale of still using
+	 * it.
+	 */
+	pr_fd = PR_ImportTCPSocket(port->sock);
+	if (!pr_fd)
+		ereport(ERROR,
+				(errmsg("unable to connect to socket")));
+
+	/*
+	 * Most of the documentation available, and implementations of, NSS/NSPR
+	 * use the PR_NewTCPSocket() function here, which has the drawback that it
+	 * can only create IPv4 sockets. Instead use PR_OpenTCPSocket() which
+	 * copes with IPv6 as well.
+	 *
+	 * We use a model filedescriptor here which is a construct in NSPR/NSS in
+	 * order to create a configuration template for sockets which can then be
+	 * applied to new sockets created. This makes more sense in a server which
+	 * accepts multiple connections and want to perform the boilerplate just
+	 * once, but it does provide a nice abstraction here aswell in that we can
+	 * error out early without having performed any operation on the real
+	 * socket.
+	 */
+	model = PR_OpenTCPSocket(port->laddr.addr.ss_family);
+	if (!model)
+		ereport(ERROR,
+				(errmsg("unable to open socket")));
+
+	/*
+	 * Convert the NSPR socket to an SSL socket. Ensuring the success of this
+	 * operation is critical as NSS SSL_* functions may return SECSuccess on
+	 * the socket even though SSL hasn't been enabled, which introduce a risk
+	 * of silent downgrades.
+	 */
+	model = SSL_ImportFD(NULL, model);
+	if (!model)
+		ereport(ERROR,
+				(errmsg("unable to enable TLS on socket")));
+
+	/*
+	 * Configure basic settings for the connection over the SSL socket in
+	 * order to set it up as a server.
+	 */
+	if (SSL_OptionSet(model, SSL_SECURITY, PR_TRUE) != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to configure TLS connection")));
+
+	if (SSL_OptionSet(model, SSL_HANDSHAKE_AS_SERVER, PR_TRUE) != SECSuccess ||
+		SSL_OptionSet(model, SSL_HANDSHAKE_AS_CLIENT, PR_FALSE) != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to configure TLS connection as server")));
+
+	/*
+	 * SSLv2 is disabled by default, and SSLv3 will be excluded from the range
+	 * of allowed protocols further down. Since we really don't want these to
+	 * ever be enabled, let's use belts and suspenders and explicitly turn
+	 * them off as well.
+	 */
+	SSL_OptionSet(model, SSL_ENABLE_SSL2, PR_FALSE);
+	SSL_OptionSet(model, SSL_ENABLE_SSL3, PR_FALSE);
+
+#ifdef SSL_CBC_RANDOM_IV
+
+	/*
+	 * Enable protection against the BEAST attack in case the NSS server has
+	 * support for that. While SSLv3 is disabled, we may still allow TLSv1
+	 * which is affected. The option isn't documented as an SSL option, but as
+	 * an NSS environment variable.
+	 */
+	SSL_OptionSet(model, SSL_CBC_RANDOM_IV, PR_TRUE);
+#endif
+
+	/*
+	 * Configure the allowed ciphers. If there are no user preferred suites,
+	 * set the domestic policy.
+	 *
+	 * Historically there were different cipher policies based on export (and
+	 * import) restrictions: Domestic, Export and France. These are since long
+	 * removed with all ciphers being enabled by default. Due to backwards
+	 * compatibility, the old API is still used even though all three policies
+	 * now do the same thing.
+	 *
+	 * If SSLCipherSuites define a policy of the user, we set that rather than
+	 * enabling all ciphers via NSS_SetDomesticPolicy.
+	 *
+	 * TODO: while this code works, the set of ciphers which can be set and
+	 * still end up with a working socket is woefully underdocumented for
+	 * anything more recent than SSLv3 (the code for TLS actually calls ssl3
+	 * functions under the hood for SSL_CipherPrefSet), so it's unclear if this
+	 * is helpful or not. Using the policies works, but may be too coarsely
+	 * grained.
+	 *
+	 * Another TODO: The SSL_ImplementedCiphers table returned with calling
+	 * SSL_GetImplementedCiphers is sorted in server preference order. Sorting
+	 * SSLCipherSuites according to the order of the ciphers therein could be
+	 * a way to implement ssl_prefer_server_ciphers - if we at all want to use
+	 * cipher selection for NSS like how we do it for OpenSSL that is.
+	 */
+
+	/*
+	 * If no ciphers are specified, enable them all.
+	 */
+	if (!SSLCipherSuites || strlen(SSLCipherSuites) == 0)
+	{
+		status = NSS_SetDomesticPolicy();
+		if (status != SECSuccess)
+			ereport(ERROR,
+					(errmsg("unable to set cipher policy: %s",
+							pg_SSLerrmessage(PR_GetError()))));
+	}
+	else
+	{
+		char	   *ciphers,
+				   *c;
+
+		char	   *sep = ":;, ";
+		PRUint16	ciphercode;
+		const		PRUint16 *nss_ciphers;
+
+		/*
+		 * If the user has specified a set of preferred cipher suites we start
+		 * by turning off all the existing suites to avoid the risk of down-
+		 * grades to a weaker cipher than expected.
+		 */
+		nss_ciphers = SSL_GetImplementedCiphers();
+		for (int i = 0; i < SSL_GetNumImplementedCiphers(); i++)
+			SSL_CipherPrefSet(model, nss_ciphers[i], PR_FALSE);
+
+		ciphers = pstrdup(SSLCipherSuites);
+
+		for (c = strtok(ciphers, sep); c; c = strtok(NULL, sep))
+		{
+			ciphercode = pg_find_cipher(c);
+			if (ciphercode != INVALID_CIPHER)
+			{
+				status = SSL_CipherPrefSet(model, ciphercode, PR_TRUE);
+				if (status != SECSuccess)
+					ereport(ERROR,
+							(errmsg("invalid cipher-suite specified: %s", c)));
+			}
+		}
+
+		pfree(ciphers);
+	}
+
+	if (SSL_VersionRangeSet(model, &desired_sslver) != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to set requested SSL protocol version range")));
+
+	/*
+	 * Set up the custom IO layer.
+	 */
+	layer = init_iolayer(port);
+	if (!layer)
+		goto error;
+
+	/* Store the Port as private data available in callbacks */
+	layer->secret = (void *) port;
+
+	if (PR_PushIOLayer(pr_fd, PR_TOP_IO_LAYER, layer) != PR_SUCCESS)
+	{
+		PR_Close(layer);
+		ereport(ERROR,
+				(errmsg("unable to push IO layer")));
+	}
+
+	server_cert = PK11_FindCertFromNickname(ssl_cert_file, (void *) port);
+	if (!server_cert)
+	{
+		if (dummy_ssl_passwd_cb_called)
+			ereport(ERROR,
+					(errmsg("unable to load certificate for \"%s\": %s",
+							ssl_cert_file, pg_SSLerrmessage(PR_GetError())),
+					 errhint("The certificate requires a password.")));
+		else
+			ereport(ERROR,
+					(errmsg("unable to find certificate for \"%s\": %s",
+							ssl_cert_file, pg_SSLerrmessage(PR_GetError()))));
+	}
+
+	private_key = PK11_FindKeyByAnyCert(server_cert, (void *) port);
+	if (!private_key)
+	{
+		if (dummy_ssl_passwd_cb_called)
+			ereport(ERROR,
+					(errmsg("unable to load private key for \"%s\": %s",
+							ssl_cert_file, pg_SSLerrmessage(PR_GetError())),
+					 errhint("The private key requires a password.")));
+		else
+			ereport(ERROR,
+					(errmsg("unable to find private key for \"%s\": %s",
+							ssl_cert_file, pg_SSLerrmessage(PR_GetError()))));
+	}
+
+	/*
+	 * NSS doesn't use CRL files on disk, so we use the ssl_crl_file guc to
+	 * contain the CRL nickname for the current server certificate in the NSS
+	 * certificate database. The main difference from the OpenSSL backend is
+	 * that NSS will use the CRL regardless, but being able to make sure the
+	 * CRL is loaded seems like a good feature.
+	 */
+	if (ssl_crl_file[0])
+	{
+		SECITEM_CopyItem(NULL, &crlname, &server_cert->derSubject);
+		crl = SEC_FindCrlByName(CERT_GetDefaultCertDB(), &crlname, SEC_CRL_TYPE);
+		if (!crl)
+			ereport(ERROR,
+					(errmsg("specified CRL not found in database")));
+		SEC_DestroyCrl(crl);
+	}
+
+	/*
+	 * Finally we must configure the socket for being a server by setting the
+	 * certificate and key.
+	 */
+	status = SSL_ConfigSecureServer(model, server_cert, private_key, kt_rsa);
+	if (status != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to configure secure server: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+	status = SSL_ConfigServerCert(model, server_cert, private_key, NULL, 0);
+	if (status != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to configure server for TLS server connections: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+
+	ssl_loaded_verify_locations = true;
+
+	/*
+	 * At this point, we no longer have use for the certificate and private
+	 * key as they have been copied into the context by NSS. Destroy our
+	 * copies explicitly to clean out the memory as best we can.
+	 */
+	CERT_DestroyCertificate(server_cert);
+	SECKEY_DestroyPrivateKey(private_key);
+
+	status = SSL_AuthCertificateHook(model, pg_cert_auth_handler, (void *) port);
+	if (status != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to install authcert hook: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+	SSL_BadCertHook(model, pg_bad_cert_handler, (void *) port);
+	SSL_OptionSet(model, SSL_REQUEST_CERTIFICATE, PR_TRUE);
+	SSL_OptionSet(model, SSL_REQUIRE_CERTIFICATE, PR_FALSE);
+
+	port->pr_fd = SSL_ImportFD(model, pr_fd);
+	if (!port->pr_fd)
+		ereport(ERROR,
+				(errmsg("unable to initialize")));
+
+	PR_Close(model);
+
+	/*
+	 * Force a handshake on the next I/O request, the second parameter means
+	 * that we are a server, PR_FALSE would indicate being a client. NSPR
+	 * requires us to call SSL_ResetHandshake since we imported an already
+	 * established socket.
+	 */
+	status = SSL_ResetHandshake(port->pr_fd, PR_TRUE);
+	if (status != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to initiate handshake: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+	status = SSL_ForceHandshake(port->pr_fd);
+	if (status != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to handshake: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+
+	port->ssl_in_use = true;
+	return 0;
+
+error:
+	return 1;
+}
+
+ssize_t
+be_tls_read(Port *port, void *ptr, size_t len, int *waitfor)
+{
+	ssize_t		n_read;
+	PRErrorCode err;
+
+	n_read = PR_Read(port->pr_fd, ptr, len);
+
+	if (n_read < 0)
+	{
+		err = PR_GetError();
+
+		if (err == PR_WOULD_BLOCK_ERROR)
+		{
+			*waitfor = WL_SOCKET_READABLE;
+			errno = EWOULDBLOCK;
+		}
+		else
+			errno = ECONNRESET;
+	}
+
+	return n_read;
+}
+
+ssize_t
+be_tls_write(Port *port, void *ptr, size_t len, int *waitfor)
+{
+	ssize_t		n_write;
+	PRErrorCode err;
+	PRIntn		flags = 0;
+
+	/*
+	 * The flags parameter to PR_Send is no longer used and is, according to
+	 * the documentation, required to be zero.
+	 */
+	n_write = PR_Send(port->pr_fd, ptr, len, flags, PR_INTERVAL_NO_WAIT);
+
+	if (n_write < 0)
+	{
+		err = PR_GetError();
+
+		if (err == PR_WOULD_BLOCK_ERROR)
+		{
+			*waitfor = WL_SOCKET_WRITEABLE;
+			errno = EWOULDBLOCK;
+		}
+		else
+			errno = ECONNRESET;
+	}
+
+	return n_write;
+}
+
+void
+be_tls_close(Port *port)
+{
+	if (!port)
+		return;
+
+	if (port->peer_cn)
+	{
+		SSL_InvalidateSession(port->pr_fd);
+		pfree(port->peer_cn);
+		port->peer_cn = NULL;
+	}
+
+	PR_Close(port->pr_fd);
+	port->pr_fd = NULL;
+	port->ssl_in_use = false;
+
+	if (nss_context)
+	{
+		NSS_ShutdownContext(nss_context);
+		nss_context = NULL;
+	}
+}
+
+void
+be_tls_destroy(void)
+{
+	/*
+	 * It reads a bit odd to clear a session cache when we are destroying the
+	 * context altogether, but if the session cache isn't cleared before
+	 * shutting down the context it will fail with SEC_ERROR_BUSY.
+	 */
+	SSL_ClearSessionCache();
+}
+
+int
+be_tls_get_cipher_bits(Port *port)
+{
+	SECStatus	status;
+	SSLChannelInfo channel;
+	SSLCipherSuiteInfo suite;
+
+	status = SSL_GetChannelInfo(port->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+		goto error;
+
+	status = SSL_GetCipherSuiteInfo(channel.cipherSuite, &suite, sizeof(suite));
+	if (status != SECSuccess)
+		goto error;
+
+	return suite.effectiveKeyBits;
+
+error:
+	ereport(WARNING,
+			(errmsg("unable to extract TLS session information: %s",
+					pg_SSLerrmessage(PR_GetError()))));
+	return 0;
+}
+
+/*
+ * be_tls_get_compression
+ *
+ * NSS disabled support for TLS compression in version 3.33 and removed the
+ * code in a subsequent release. The API for retrieving information about
+ * compression as well as enabling it is kept for backwards compatibility, but
+ * we don't need to consult it since it was only available for SSLv3 which we
+ * don't support.
+ *
+ * https://bugzilla.mozilla.org/show_bug.cgi?id=1409587
+ */
+bool
+be_tls_get_compression(Port *port)
+{
+	return false;
+}
+
+/*
+ * be_tls_get_version
+ *
+ * Returns the protocol version used for the current connection, or NULL in
+ * case of errors.
+ */
+const char *
+be_tls_get_version(Port *port)
+{
+	SECStatus	status;
+	SSLChannelInfo channel;
+
+	status = SSL_GetChannelInfo(port->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+	{
+		ereport(WARNING,
+				(errmsg("unable to extract TLS session information: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+		return NULL;
+	}
+
+	return ssl_protocol_version_to_string(channel.protocolVersion);
+}
+
+const char *
+be_tls_get_cipher(Port *port)
+{
+	SECStatus	status;
+	SSLChannelInfo channel;
+	SSLCipherSuiteInfo suite;
+
+	status = SSL_GetChannelInfo(port->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+		goto error;
+
+	status = SSL_GetCipherSuiteInfo(channel.cipherSuite, &suite, sizeof(suite));
+	if (status != SECSuccess)
+		goto error;
+
+	return suite.cipherSuiteName;
+
+error:
+	ereport(WARNING,
+			(errmsg("unable to extract TLS session information: %s",
+					pg_SSLerrmessage(PR_GetError()))));
+	return NULL;
+}
+
+void
+be_tls_get_peer_subject_name(Port *port, char *ptr, size_t len)
+{
+	CERTCertificate *certificate;
+
+	certificate = SSL_PeerCertificate(port->pr_fd);
+	if (certificate)
+		strlcpy(ptr, CERT_NameToAscii(&certificate->subject), len);
+	else
+		ptr[0] = '\0';
+}
+
+void
+be_tls_get_peer_issuer_name(Port *port, char *ptr, size_t len)
+{
+	CERTCertificate *certificate;
+
+	certificate = SSL_PeerCertificate(port->pr_fd);
+	if (certificate)
+		strlcpy(ptr, CERT_NameToAscii(&certificate->issuer), len);
+	else
+		ptr[0] = '\0';
+}
+
+void
+be_tls_get_peer_serial(Port *port, char *ptr, size_t len)
+{
+	CERTCertificate *certificate;
+
+	certificate = SSL_PeerCertificate(port->pr_fd);
+	if (certificate)
+		snprintf(ptr, len, "%li", DER_GetInteger(&(certificate->serialNumber)));
+	else
+		ptr[0] = '\0';
+}
+
+/* ------------------------------------------------------------ */
+/*						Internal functions						*/
+/* ------------------------------------------------------------ */
+
+/*
+ * default_nss_tls_init
+ *
+ * The default TLS init hook function which users can override for installing
+ * their own passphrase callbacks and similar actions. In case no callback has
+ * been configured, or the callback isn't reload capable during a server
+ * reload, the dummy callback will be installed.
+ *
+ * The private data for the callback is set differently depending on how it's
+ * invoked. For calls which may invoke the callback deeper in the callstack
+ * the private data is set with SSL_SetPKCS11PinArg. When the call is directly
+ * invoking the callback, like PK11_FindCertFromNickname, then the private
+ * data is passed as a parameter. Setting the data with SSL_SetPKCS11PinArg is
+ * thus not required but good practice.
+ *
+ * NSS doesn't provide a default callback like OpenSSL does, but a callback is
+ * required to be set.  The password callback can be installed at any time, but
+ * setting the private data with SSL_SetPKCS11PinArg requires a PR Filedesc.
+ */
+static void
+default_nss_tls_init(bool isServerStart)
+{
+	/*
+	 * No user-defined callback has been configured, install the dummy call-
+	 * back since we must set something.
+	 */
+	if (!ssl_passphrase_command[0])
+		PK11_SetPasswordFunc(dummy_ssl_passphrase_cb);
+	else
+	{
+		/*
+		 * There is a user-defined callback, set it unless we are in a restart
+		 * and cannot handle restarts due to an interactive callback.
+		 */
+		if (isServerStart)
+			PK11_SetPasswordFunc(external_ssl_passphrase_cb);
+		else
+		{
+			if (ssl_passphrase_command_supports_reload)
+				PK11_SetPasswordFunc(external_ssl_passphrase_cb);
+			else
+				PK11_SetPasswordFunc(dummy_ssl_passphrase_cb);
+		}
+	}
+}
+
+/*
+ * external_ssl_passphrase_cb
+ *
+ * Runs the callback configured by ssl_passphrase_command and returns the
+ * captured password back to NSS.
+ */
+static char *
+external_ssl_passphrase_cb(PK11SlotInfo *slot, PRBool retry, void *arg)
+{
+	/*
+	 * NSS use a hardcoded 256 byte buffer for reading the password so set the
+	 * same limit for our callback buffer.
+	 */
+	char		buf[256];
+	int			len;
+	char	   *password = NULL;
+	char	   *prompt;
+
+	/*
+	 * Since there is no password callback in NSS when the server starts up,
+	 * it makes little sense to create an interactive callback. Thus, if this
+	 * is a retry attempt then give up immediately.
+	 */
+	if (retry)
+		return NULL;
+
+	/*
+	 * Construct the same prompt that NSS uses internally even though it is
+	 * unlikely to serve much purpose, but we must set a prompt so we might
+	 * as well do it right.
+	 */
+	prompt = psprintf("Enter Password or Pin for \"%s\":",
+					  PK11_GetTokenName(slot));
+
+	len = run_ssl_passphrase_command(prompt, ssl_is_server_start, buf, sizeof(buf));
+	pfree(prompt);
+
+	if (!len)
+		return NULL;
+
+	/*
+	 * At least one byte with password content was returned, and NSS requires
+	 * that we return it allocated in NSS controlled memory. If we fail to
+	 * allocate then abort without passing back NULL and bubble up the error
+	 * on the PG side.
+	 */
+	password = (char *) PR_Malloc(len + 1);
+	if (!password)
+	{
+		explicit_bzero(buf, sizeof(buf));
+		ereport(ERROR,
+				(errcode(ERRCODE_OUT_OF_MEMORY),
+				 errmsg("out of memory")));
+	}
+	strlcpy(password, buf, sizeof(password));
+	explicit_bzero(buf, sizeof(buf));
+
+	return password;
+}
+
+/*
+ * dummy_ssl_passphrase_cb
+ *
+ * Return unsuccessful if we are asked to provide the passphrase for a cert or
+ * key, without having a passphrase callback installed.
+ */
+static char *
+dummy_ssl_passphrase_cb(PK11SlotInfo *slot, PRBool retry, void *arg)
+{
+	dummy_ssl_passwd_cb_called = true;
+	return NULL;
+}
+
+static SECStatus
+pg_bad_cert_handler(void *arg, PRFileDesc * fd)
+{
+	Port	   *port = (Port *) arg;
+
+	port->peer_cert_valid = false;
+	return SECFailure;
+}
+
+static SECStatus
+pg_cert_auth_handler(void *arg, PRFileDesc * fd, PRBool checksig, PRBool isServer)
+{
+	SECStatus	status;
+	Port	   *port = (Port *) arg;
+	CERTCertificate *cert;
+	char	   *peer_cn;
+	int			len;
+
+	status = SSL_AuthCertificate(CERT_GetDefaultCertDB(), port->pr_fd, checksig, PR_TRUE);
+	if (status == SECSuccess)
+	{
+		cert = SSL_PeerCertificate(port->pr_fd);
+		len = strlen(cert->subjectName);
+		peer_cn = MemoryContextAllocZero(TopMemoryContext, len + 1);
+		/*
+		 * Skip over the key= portion of the key=value containing the the
+		 * peer CN.
+		 */
+		if (strncmp(cert->subjectName, "CN=", 3) == 0)
+			strlcpy(peer_cn, cert->subjectName + strlen("CN="), len + 1);
+		else
+			strlcpy(peer_cn, cert->subjectName, len + 1);
+		CERT_DestroyCertificate(cert);
+
+		port->peer_cn = peer_cn;
+		port->peer_cert_valid = true;
+	}
+
+	return status;
+}
+
+static PRInt32
+pg_ssl_read(PRFileDesc *fd, void *buf, PRInt32 amount, PRIntn flags,
+			PRIntervalTime timeout)
+{
+	PRRecvFN	read_fn;
+	PRInt32		n_read;
+
+	read_fn = fd->lower->methods->recv;
+	n_read = read_fn(fd->lower, buf, amount, flags, timeout);
+
+	return n_read;
+}
+
+static PRInt32
+pg_ssl_write(PRFileDesc *fd, const void *buf, PRInt32 amount, PRIntn flags,
+			 PRIntervalTime timeout)
+{
+	PRSendFN	send_fn;
+	PRInt32		n_write;
+
+	send_fn = fd->lower->methods->send;
+	n_write = send_fn(fd->lower, buf, amount, flags, timeout);
+
+	return n_write;
+}
+
+static PRFileDesc *
+init_iolayer(Port *port)
+{
+	const		PRIOMethods *default_methods;
+	PRFileDesc *layer;
+
+	/*
+	 * Start by initializing our layer with all the default methods so that we
+	 * can selectively override the ones we want while still ensuring that we
+	 * have a complete layer specification.
+	 */
+	default_methods = PR_GetDefaultIOMethods();
+	memcpy(&pr_iomethods, default_methods, sizeof(PRIOMethods));
+
+	pr_iomethods.recv = pg_ssl_read;
+	pr_iomethods.send = pg_ssl_write;
+
+	/*
+	 * Each IO layer must be identified by a unique name, where uniqueness is
+	 * per connection. Each connection in a postgres cluster can generate the
+	 * identity from the same string as they will create their IO layers on
+	 * different sockets. Only one layer per socket can have the same name.
+	 */
+	pr_id = PR_GetUniqueIdentity("PostgreSQL Server");
+	if (pr_id == PR_INVALID_IO_LAYER)
+	{
+		ereport(ERROR,
+				(errmsg("out of memory when setting up TLS connection")));
+		return NULL;
+	}
+
+	/*
+	 * Create the actual IO layer as a stub such that it can be pushed onto
+	 * the layer stack. The step via a stub is required as we define custom
+	 * callbacks.
+	 */
+	layer = PR_CreateIOLayerStub(pr_id, &pr_iomethods);
+	if (!layer)
+	{
+		ereport(ERROR,
+				(errmsg("unable to create NSS I/O layer")));
+		return NULL;
+	}
+
+	return layer;
+}
+
+static char *
+ssl_protocol_version_to_string(int v)
+{
+	switch (v)
+	{
+			/* SSL v2 and v3 are not supported */
+		case SSL_LIBRARY_VERSION_2:
+		case SSL_LIBRARY_VERSION_3_0:
+			Assert(false);
+			break;
+
+		case SSL_LIBRARY_VERSION_TLS_1_0:
+			return pstrdup("TLSv1.0");
+		case SSL_LIBRARY_VERSION_TLS_1_1:
+			return pstrdup("TLSv1.1");
+		case SSL_LIBRARY_VERSION_TLS_1_2:
+			return pstrdup("TLSv1.2");
+		case SSL_LIBRARY_VERSION_TLS_1_3:
+			return pstrdup("TLSv1.3");
+	}
+
+	return pstrdup("unknown");
+}
+
+
+/*
+ * ssl_protocol_version_to_nss
+ *			Translate PostgreSQL TLS version to NSS version
+ *
+ * Returns zero in case the requested TLS version is undefined (PG_ANY) and
+ * should be set by the caller, or -1 on failure.
+ */
+static uint16
+ssl_protocol_version_to_nss(int v, const char *guc_name)
+{
+	switch (v)
+	{
+			/*
+			 * There is no SSL_LIBRARY_ macro defined in NSS with the value
+			 * zero, so we use this to signal the caller that the highest
+			 * useful version should be set on the connection.
+			 */
+		case PG_TLS_ANY:
+			return 0;
+
+			/*
+			 * No guard is required here as there are no versions of NSS
+			 * without support for TLS1.
+			 */
+		case PG_TLS1_VERSION:
+			return SSL_LIBRARY_VERSION_TLS_1_0;
+		case PG_TLS1_1_VERSION:
+#ifdef SSL_LIBRARY_VERSION_TLS_1_1
+			return SSL_LIBRARY_VERSION_TLS_1_1;
+#else
+			break;
+#endif
+		case PG_TLS1_2_VERSION:
+#ifdef SSL_LIBRARY_VERSION_TLS_1_2
+			return SSL_LIBRARY_VERSION_TLS_1_2;
+#else
+			break;
+#endif
+		case PG_TLS1_3_VERSION:
+#ifdef SSL_LIBRARY_VERSION_TLS_1_3
+			return SSL_LIBRARY_VERSION_TLS_1_3;
+#else
+			break;
+#endif
+		default:
+			break;
+	}
+
+	return -1;
+}
+
+/*
+ * pg_SSLerrmessage
+ *		Create and return a human readable error message given
+ *		the specified error code
+ *
+ * PR_ErrorToName only converts the enum identifier of the error to string,
+ * but that can be quite useful for debugging (and in case PR_ErrorToString is
+ * unable to render a message then we at least have something).
+ */
+static char *
+pg_SSLerrmessage(PRErrorCode errcode)
+{
+	return psprintf("%s (%s)",
+					PR_ErrorToString(errcode, PR_LANGUAGE_I_DEFAULT),
+					PR_ErrorToName(errcode));
+}
diff --git a/src/backend/libpq/be-secure-openssl.c b/src/backend/libpq/be-secure-openssl.c
index 8b21ff4065..5962cffc0c 100644
--- a/src/backend/libpq/be-secure-openssl.c
+++ b/src/backend/libpq/be-secure-openssl.c
@@ -1298,15 +1298,28 @@ X509_NAME_to_cstring(X509_NAME *name)
 	char	   *dp;
 	char	   *result;
 
+	if (membuf == NULL)
+		ereport(ERROR,
+				(errcode(ERRCODE_OUT_OF_MEMORY),
+				 errmsg("failed to create BIO")));
+
 	(void) BIO_set_close(membuf, BIO_CLOSE);
 	for (i = 0; i < count; i++)
 	{
 		e = X509_NAME_get_entry(name, i);
 		nid = OBJ_obj2nid(X509_NAME_ENTRY_get_object(e));
+		if (nid == NID_undef)
+			ereport(ERROR,
+					(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
+					 errmsg("could not get NID for ASN1_OBJECT object")));
 		v = X509_NAME_ENTRY_get_data(e);
 		field_name = OBJ_nid2sn(nid);
 		if (!field_name)
 			field_name = OBJ_nid2ln(nid);
+		if (field_name == NULL)
+			ereport(ERROR,
+					(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
+					 errmsg("could not convert NID %d to an ASN1_OBJECT structure", nid)));
 		BIO_printf(membuf, "/%s=", field_name);
 		ASN1_STRING_print_ex(membuf, v,
 							 ((ASN1_STRFLGS_RFC2253 & ~ASN1_STRFLGS_ESC_MSB)
@@ -1322,7 +1335,8 @@ X509_NAME_to_cstring(X509_NAME *name)
 	result = pstrdup(dp);
 	if (dp != sp)
 		pfree(dp);
-	BIO_free(membuf);
+	if (BIO_free(membuf) != 1)
+		elog(ERROR, "could not free OpenSSL BIO structure");
 
 	return result;
 }
diff --git a/src/backend/libpq/be-secure.c b/src/backend/libpq/be-secure.c
index 2ae507a902..f39977b80c 100644
--- a/src/backend/libpq/be-secure.c
+++ b/src/backend/libpq/be-secure.c
@@ -49,6 +49,9 @@ bool		ssl_passphrase_command_supports_reload;
 #ifdef USE_SSL
 bool		ssl_loaded_verify_locations = false;
 #endif
+#ifdef USE_NSS
+char	   *ssl_database;
+#endif
 
 /* GUC variable controlling SSL cipher list */
 char	   *SSLCipherSuites = NULL;
diff --git a/src/backend/libpq/hba.c b/src/backend/libpq/hba.c
index 4c86fb6087..8821c60a34 100644
--- a/src/backend/libpq/hba.c
+++ b/src/backend/libpq/hba.c
@@ -1040,7 +1040,7 @@ parse_hba_line(TokenizedLine *tok_line, int elevel)
 			ereport(elevel,
 					(errcode(ERRCODE_CONFIG_FILE_ERROR),
 					 errmsg("hostssl record cannot match because SSL is not supported by this build"),
-					 errhint("Compile with --with-openssl to use SSL connections."),
+					 errhint("Compile with --with-openssl or --with-nss to use SSL connections."),
 					 errcontext("line %d of configuration file \"%s\"",
 								line_num, HbaFileName)));
 			*err_msg = "hostssl record cannot match because SSL is not supported by this build";
diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c
index a62d64eaa4..050f673c68 100644
--- a/src/backend/utils/misc/guc.c
+++ b/src/backend/utils/misc/guc.c
@@ -4262,7 +4262,11 @@ static struct config_string ConfigureNamesString[] =
 		},
 		&ssl_library,
 #ifdef USE_SSL
+#if defined(USE_OPENSSL)
 		"OpenSSL",
+#elif defined(USE_NSS)
+		"NSS",
+#endif
 #else
 		"",
 #endif
@@ -4320,6 +4324,18 @@ static struct config_string ConfigureNamesString[] =
 		check_canonical_path, assign_pgstat_temp_directory, NULL
 	},
 
+#ifdef USE_NSS
+	{
+		{"ssl_database", PGC_SIGHUP, CONN_AUTH_SSL,
+			gettext_noop("Location of the NSS certificate database."),
+			NULL
+		},
+		&ssl_database,
+		"",
+		NULL, NULL, NULL
+	},
+#endif
+
 	{
 		{"synchronous_standby_names", PGC_SIGHUP, REPLICATION_PRIMARY,
 			gettext_noop("Number of synchronous standbys and list of names of potential synchronous ones."),
@@ -4348,8 +4364,10 @@ static struct config_string ConfigureNamesString[] =
 			GUC_SUPERUSER_ONLY
 		},
 		&SSLCipherSuites,
-#ifdef USE_OPENSSL
+#if defined(USE_OPENSSL)
 		"HIGH:MEDIUM:+3DES:!aNULL",
+#elif defined (USE_NSS)
+		"",
 #else
 		"none",
 #endif
diff --git a/src/include/common/pg_nss.h b/src/include/common/pg_nss.h
new file mode 100644
index 0000000000..9205f0fc3b
--- /dev/null
+++ b/src/include/common/pg_nss.h
@@ -0,0 +1,141 @@
+/*-------------------------------------------------------------------------
+ *
+ * pg_nss.h
+ *	  Support for NSS as a TLS backend
+ *
+ * These definitions are used by both frontend and backend code.
+ *
+ * Copyright (c) 2020, PostgreSQL Global Development Group
+ *
+ * IDENTIFICATION
+ *        src/include/common/pg_nss.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef PG_NSS_H
+#define PG_NSS_H
+
+#ifdef USE_NSS
+
+#include <nss/sslproto.h>
+
+PRUint16	pg_find_cipher(char *name);
+
+typedef struct
+{
+	const char *name;
+	PRUint16	number;
+}			NSSCiphers;
+
+#define INVALID_CIPHER	0xFFFF
+
+/*
+ * This list is a partial copy of the ciphers in NSS files lib/ssl/sslproto.h
+ * in order to provide a human readable version of the ciphers. It would be
+ * nice to not have to have this, but NSS doesn't provide any API addressing
+ * the ciphers by name. TODO: do we want more of the ciphers, or perhaps less?
+ */
+static const NSSCiphers NSS_CipherList[] = {
+
+	{"TLS_NULL_WITH_NULL_NULL", TLS_NULL_WITH_NULL_NULL},
+
+	{"TLS_RSA_WITH_NULL_MD5", TLS_RSA_WITH_NULL_MD5},
+	{"TLS_RSA_WITH_NULL_SHA", TLS_RSA_WITH_NULL_SHA},
+	{"TLS_RSA_WITH_RC4_128_MD5", TLS_RSA_WITH_RC4_128_MD5},
+	{"TLS_RSA_WITH_RC4_128_SHA", TLS_RSA_WITH_RC4_128_SHA},
+	{"TLS_RSA_WITH_IDEA_CBC_SHA", TLS_RSA_WITH_IDEA_CBC_SHA},
+	{"TLS_RSA_WITH_DES_CBC_SHA", TLS_RSA_WITH_DES_CBC_SHA},
+	{"TLS_RSA_WITH_3DES_EDE_CBC_SHA", TLS_RSA_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_DH_DSS_WITH_DES_CBC_SHA", TLS_DH_DSS_WITH_DES_CBC_SHA},
+	{"TLS_DH_DSS_WITH_3DES_EDE_CBC_SHA", TLS_DH_DSS_WITH_3DES_EDE_CBC_SHA},
+	{"TLS_DH_RSA_WITH_DES_CBC_SHA", TLS_DH_RSA_WITH_DES_CBC_SHA},
+	{"TLS_DH_RSA_WITH_3DES_EDE_CBC_SHA", TLS_DH_RSA_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_DHE_DSS_WITH_DES_CBC_SHA", TLS_DHE_DSS_WITH_DES_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_3DES_EDE_CBC_SHA", TLS_DHE_DSS_WITH_3DES_EDE_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_DES_CBC_SHA", TLS_DHE_RSA_WITH_DES_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA", TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_DH_anon_WITH_RC4_128_MD5", TLS_DH_anon_WITH_RC4_128_MD5},
+	{"TLS_DH_anon_WITH_DES_CBC_SHA", TLS_DH_anon_WITH_DES_CBC_SHA},
+	{"TLS_DH_anon_WITH_3DES_EDE_CBC_SHA", TLS_DH_anon_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_RSA_WITH_AES_128_CBC_SHA", TLS_RSA_WITH_AES_128_CBC_SHA},
+	{"TLS_DH_DSS_WITH_AES_128_CBC_SHA", TLS_DH_DSS_WITH_AES_128_CBC_SHA},
+	{"TLS_DH_RSA_WITH_AES_128_CBC_SHA", TLS_DH_RSA_WITH_AES_128_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_AES_128_CBC_SHA", TLS_DHE_DSS_WITH_AES_128_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_AES_128_CBC_SHA", TLS_DHE_RSA_WITH_AES_128_CBC_SHA},
+	{"TLS_DH_anon_WITH_AES_128_CBC_SHA", TLS_DH_anon_WITH_AES_128_CBC_SHA},
+
+	{"TLS_RSA_WITH_AES_256_CBC_SHA", TLS_RSA_WITH_AES_256_CBC_SHA},
+	{"TLS_DH_DSS_WITH_AES_256_CBC_SHA", TLS_DH_DSS_WITH_AES_256_CBC_SHA},
+	{"TLS_DH_RSA_WITH_AES_256_CBC_SHA", TLS_DH_RSA_WITH_AES_256_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_AES_256_CBC_SHA", TLS_DHE_DSS_WITH_AES_256_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_AES_256_CBC_SHA", TLS_DHE_RSA_WITH_AES_256_CBC_SHA},
+	{"TLS_DH_anon_WITH_AES_256_CBC_SHA", TLS_DH_anon_WITH_AES_256_CBC_SHA},
+	{"TLS_RSA_WITH_NULL_SHA256", TLS_RSA_WITH_NULL_SHA256},
+	{"TLS_RSA_WITH_AES_128_CBC_SHA256", TLS_RSA_WITH_AES_128_CBC_SHA256},
+	{"TLS_RSA_WITH_AES_256_CBC_SHA256", TLS_RSA_WITH_AES_256_CBC_SHA256},
+
+	{"TLS_DHE_DSS_WITH_AES_128_CBC_SHA256", TLS_DHE_DSS_WITH_AES_128_CBC_SHA256},
+	{"TLS_RSA_WITH_CAMELLIA_128_CBC_SHA", TLS_RSA_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DH_DSS_WITH_CAMELLIA_128_CBC_SHA", TLS_DH_DSS_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DH_RSA_WITH_CAMELLIA_128_CBC_SHA", TLS_DH_RSA_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_CAMELLIA_128_CBC_SHA", TLS_DHE_DSS_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA", TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DH_anon_WITH_CAMELLIA_128_CBC_SHA", TLS_DH_anon_WITH_CAMELLIA_128_CBC_SHA},
+
+	{"TLS_DHE_DSS_WITH_RC4_128_SHA", TLS_DHE_DSS_WITH_RC4_128_SHA},
+	{"TLS_DHE_RSA_WITH_AES_128_CBC_SHA256", TLS_DHE_RSA_WITH_AES_128_CBC_SHA256},
+	{"TLS_DHE_DSS_WITH_AES_256_CBC_SHA256", TLS_DHE_DSS_WITH_AES_256_CBC_SHA256},
+	{"TLS_DHE_RSA_WITH_AES_256_CBC_SHA256", TLS_DHE_RSA_WITH_AES_256_CBC_SHA256},
+
+	{"TLS_RSA_WITH_CAMELLIA_256_CBC_SHA", TLS_RSA_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DH_DSS_WITH_CAMELLIA_256_CBC_SHA", TLS_DH_DSS_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DH_RSA_WITH_CAMELLIA_256_CBC_SHA", TLS_DH_RSA_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_CAMELLIA_256_CBC_SHA", TLS_DHE_DSS_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA", TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DH_anon_WITH_CAMELLIA_256_CBC_SHA", TLS_DH_anon_WITH_CAMELLIA_256_CBC_SHA},
+
+	{"TLS_RSA_WITH_SEED_CBC_SHA", TLS_RSA_WITH_SEED_CBC_SHA},
+
+	{"TLS_RSA_WITH_AES_128_GCM_SHA256", TLS_RSA_WITH_AES_128_GCM_SHA256},
+	{"TLS_RSA_WITH_AES_256_GCM_SHA384", TLS_RSA_WITH_AES_256_GCM_SHA384},
+	{"TLS_DHE_RSA_WITH_AES_128_GCM_SHA256", TLS_DHE_RSA_WITH_AES_128_GCM_SHA256},
+	{"TLS_DHE_RSA_WITH_AES_256_GCM_SHA384", TLS_DHE_RSA_WITH_AES_256_GCM_SHA384},
+	{"TLS_DHE_DSS_WITH_AES_128_GCM_SHA256", TLS_DHE_DSS_WITH_AES_128_GCM_SHA256},
+	{"TLS_DHE_DSS_WITH_AES_256_GCM_SHA384", TLS_DHE_DSS_WITH_AES_256_GCM_SHA384},
+
+	{"TLS_AES_128_GCM_SHA256", TLS_AES_128_GCM_SHA256},
+	{"TLS_AES_256_GCM_SHA384", TLS_AES_256_GCM_SHA384},
+	{"TLS_CHACHA20_POLY1305_SHA256", TLS_CHACHA20_POLY1305_SHA256},
+	{NULL, 0}
+};
+
+/*
+ * pg_find_cipher
+ *			Translate an NSS ciphername to the cipher code
+ *
+ * Searches the configured ciphers for the corresponding cipher code to the
+ * name. Search is performed case insensitive.
+ */
+PRUint16
+pg_find_cipher(char *name)
+{
+	const		NSSCiphers *cipher_list = NSS_CipherList;
+
+	while (cipher_list->name)
+	{
+		if (pg_strcasecmp(cipher_list->name, name) == 0)
+			return cipher_list->number;
+
+		cipher_list++;
+	}
+
+	return 0xFFFF;
+}
+
+#endif							/* USE_NSS */
+
+#endif							/* PG_NSS_H */
diff --git a/src/include/libpq/libpq-be.h b/src/include/libpq/libpq-be.h
index 0a23281ad5..b68ef64ec9 100644
--- a/src/include/libpq/libpq-be.h
+++ b/src/include/libpq/libpq-be.h
@@ -192,13 +192,18 @@ typedef struct Port
 	bool		peer_cert_valid;
 
 	/*
-	 * OpenSSL structures. (Keep these last so that the locations of other
-	 * fields are the same whether or not you build with OpenSSL.)
+	 * SSL backend specific structures. (Keep these last so that the locations
+	 * of other fields are the same whether or not you build with SSL
+	 * enabled.)
 	 */
 #ifdef USE_OPENSSL
 	SSL		   *ssl;
 	X509	   *peer;
 #endif
+
+#ifdef USE_NSS
+	void	   *pr_fd;
+#endif
 } Port;
 
 #ifdef USE_SSL
@@ -292,6 +297,10 @@ extern char *be_tls_get_certificate_hash(Port *port, size_t *len);
 typedef void (*openssl_tls_init_hook_typ) (SSL_CTX *context, bool isServerStart);
 extern PGDLLIMPORT openssl_tls_init_hook_typ openssl_tls_init_hook;
 #endif
+#ifdef USE_NSS
+typedef void (*nss_tls_init_hook_type) (bool isServerStart);
+extern PGDLLIMPORT nss_tls_init_hook_type nss_tls_init_hook;
+#endif
 
 #endif							/* USE_SSL */
 
diff --git a/src/include/libpq/libpq.h b/src/include/libpq/libpq.h
index b1152475ac..298d87ecae 100644
--- a/src/include/libpq/libpq.h
+++ b/src/include/libpq/libpq.h
@@ -88,6 +88,9 @@ extern PGDLLIMPORT bool ssl_passphrase_command_supports_reload;
 #ifdef USE_SSL
 extern bool ssl_loaded_verify_locations;
 #endif
+#ifdef USE_NSS
+extern char *ssl_database;
+#endif
 
 extern int	secure_initialize(bool isServerStart);
 extern bool secure_loaded_verify_locations(void);
diff --git a/src/include/pg_config.h.in b/src/include/pg_config.h.in
index fb270df678..73c39b449c 100644
--- a/src/include/pg_config.h.in
+++ b/src/include/pg_config.h.in
@@ -893,6 +893,12 @@
 /* Define to 1 to build with PAM support. (--with-pam) */
 #undef USE_PAM
 
+/* Define to build with NSS support (--with-nss) */
+#undef USE_NSS
+
+/* Define to use NSS for random number generation */
+#undef USE_NSS_RANDOM
+
 /* Define to 1 to use software CRC-32C implementation (slicing-by-8). */
 #undef USE_SLICING_BY_8_CRC32C
 
diff --git a/src/include/pg_config_manual.h b/src/include/pg_config_manual.h
index 705dc69c06..c28b84126d 100644
--- a/src/include/pg_config_manual.h
+++ b/src/include/pg_config_manual.h
@@ -176,10 +176,9 @@
 
 /*
  * USE_SSL code should be compiled only when compiling with an SSL
- * implementation.  (Currently, only OpenSSL is supported, but we might add
- * more implementations in the future.)
+ * implementation.
  */
-#ifdef USE_OPENSSL
+#if defined(USE_OPENSSL) || defined(USE_NSS)
 #define USE_SSL
 #endif
 
diff --git a/src/interfaces/libpq/Makefile b/src/interfaces/libpq/Makefile
index 4ac5f4b340..7b396d04af 100644
--- a/src/interfaces/libpq/Makefile
+++ b/src/interfaces/libpq/Makefile
@@ -45,9 +45,13 @@ OBJS = \
 	pqexpbuffer.o \
 	fe-auth.o
 
+ifeq ($(with_ssl),yes)
+OBJS += \
+	fe-secure-common.o
+endif
+
 ifeq ($(with_openssl),yes)
 OBJS += \
-	fe-secure-common.o \
 	fe-secure-openssl.o
 endif
 
@@ -57,6 +61,11 @@ OBJS += \
 	fe-secure-gssapi.o
 endif
 
+ifeq ($(with_nss), yes)
+OBJS += \
+	fe-secure-nss.o
+endif
+
 ifeq ($(PORTNAME), cygwin)
 override shlib = cyg$(NAME)$(DLSUFFIX)
 endif
diff --git a/src/interfaces/libpq/fe-connect.c b/src/interfaces/libpq/fe-connect.c
index b0ca37c2ed..a15a89c50c 100644
--- a/src/interfaces/libpq/fe-connect.c
+++ b/src/interfaces/libpq/fe-connect.c
@@ -355,6 +355,10 @@ static const internalPQconninfoOption PQconninfoOptions[] = {
 		"Target-Session-Attrs", "", 11, /* sizeof("read-write") = 11 */
 	offsetof(struct pg_conn, target_session_attrs)},
 
+	{"cert_database", NULL, NULL, NULL,
+		"CertificateDatabase", "", 64,
+	offsetof(struct pg_conn, cert_database)},
+
 	/* Terminating entry --- MUST BE LAST */
 	{NULL, NULL, NULL, NULL,
 	NULL, NULL, 0}
diff --git a/src/interfaces/libpq/fe-secure-nss.c b/src/interfaces/libpq/fe-secure-nss.c
new file mode 100644
index 0000000000..395147f551
--- /dev/null
+++ b/src/interfaces/libpq/fe-secure-nss.c
@@ -0,0 +1,1018 @@
+/*-------------------------------------------------------------------------
+ *
+ * fe-secure-nss.c
+ *	  functions for supporting NSS as a TLS backend for frontend libpq
+ *
+ * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ *	  src/interfaces/libpq/fe-secure-nss.c
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#include "postgres_fe.h"
+
+#include "libpq-fe.h"
+#include "fe-auth.h"
+#include "fe-secure-common.h"
+#include "libpq-int.h"
+
+/*
+ * BITS_PER_BYTE is also defined in the NSPR header files, so we need to undef
+ * our version to avoid compiler warnings on redefinition.
+ */
+#define pg_BITS_PER_BYTE BITS_PER_BYTE
+#undef BITS_PER_BYTE
+
+/*
+ * The nspr/obsolete/protypes.h NSPR header typedefs uint64 and int64 with
+ * colliding definitions from ours, causing a much expected compiler error.
+ * Remove backwards compatibility with ancient NSPR versions to avoid this.
+ */
+#define NO_NSPR_10_SUPPORT
+#include <nspr/nspr.h>
+#include <nspr/prerror.h>
+#include <nspr/prinit.h>
+#include <nspr/prio.h>
+#include <nss/nss.h>
+#include <nss/ssl.h>
+#include <nss/sslproto.h>
+#include <nss/pk11func.h>
+#include <nss/secerr.h>
+#include <nss/secmod.h>
+
+/*
+ * Ensure that the colliding definitions match, else throw an error. In case
+ * NSPR remove the definition in a future version (however unlikely that may
+ * be, make sure to put ours back again.
+ */
+#if defined(BITS_PER_BYTE)
+#if BITS_PER_BYTE != pg_BITS_PER_BYTE
+#error "incompatible byte widths between NSPR and PostgreSQL"
+#endif
+#else
+#define BITS_PER_BYTE pg_BITS_PER_BYTE
+#endif
+#undef pg_BITS_PER_BYTE
+
+static SECStatus pg_load_nss_module(SECMODModule * *module, const char *library, const char *name);
+static SECStatus pg_bad_cert_handler(void *arg, PRFileDesc * fd);
+static const char *pg_SSLerrmessage(PRErrorCode errcode);
+static SECStatus pg_client_auth_handler(void *arg, PRFileDesc * socket, CERTDistNames * caNames,
+										CERTCertificate * *pRetCert, SECKEYPrivateKey * *pRetKey);
+static SECStatus pg_cert_auth_handler(void *arg, PRFileDesc * fd, PRBool checksig, PRBool isServer);
+static int	ssl_protocol_version_to_nss(const char *protocol);
+static bool cert_database_has_CA(PGconn *conn);
+
+static char *PQssl_passwd_cb(PK11SlotInfo * slot, PRBool retry, void *arg);
+
+/*
+ * PR_ImportTCPSocket() is a private API, but very widely used, as it's the
+ * only way to make NSS use an already set up POSIX file descriptor rather
+ * than opening one itself. To quote the NSS documentation:
+ *
+ *		"In theory, code that uses PR_ImportTCPSocket may break when NSPR's
+ *		implementation changes. In practice, this is unlikely to happen because
+ *		NSPR's implementation has been stable for years and because of NSPR's
+ *		strong commitment to backward compatibility."
+ *
+ * https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSPR/Reference/PR_ImportTCPSocket
+ *
+ * The function is declared in <private/pprio.h>, but as it is a header marked
+ * private we declare it here rather than including it.
+ */
+NSPR_API(PRFileDesc *) PR_ImportTCPSocket(int);
+
+static SECMODModule * ca_trust = NULL;
+static NSSInitContext * nss_context = NULL;
+
+/*
+ * Track whether the NSS database has a password set or not. There is no API
+ * function for retrieving password status, so we simply flip this to true in
+ * case NSS invoked the password callback - as that will only happen in case
+ * there is a password. The reason for tracking this is that there are calls
+ * which require a password parameter, but doesn't use the callbacks provided,
+ * so we must call the callback on behalf of these.
+ */
+static bool has_password = false;
+
+/*
+ * This logic exist in NSS as well, but it's only available for when there is
+ * a database to open, and not only using the system trust store. Thus, we
+ * need to keep our own copy.
+ */
+#if defined(WIN32)
+static const char *ca_trust_name = "nssckbi.dll";
+#elif defined(__darwin__)
+static const char *ca_trust_name = "libnssckbi.dylib";
+#else
+static const char *ca_trust_name = "libnssckbi.so";
+#endif
+
+static PQsslKeyPassHook_nss_type PQsslKeyPassHook = NULL;
+
+/* ------------------------------------------------------------ */
+/*			 Procedures common to all secure sessions			*/
+/* ------------------------------------------------------------ */
+
+/*
+ * pgtls_init_library
+ *
+ * There is no direct equivalent for PQinitOpenSSL in NSS/NSPR, with PR_Init
+ * being the closest match there is. PR_Init is however already documented to
+ * not be required so simply making this a noop seems like the best option.
+ */
+void
+pgtls_init_library(bool do_ssl, int do_crypto)
+{
+	/* noop */
+}
+
+int
+pgtls_init(PGconn *conn)
+{
+	conn->ssl_in_use = false;
+
+	return 0;
+}
+
+void
+pgtls_close(PGconn *conn)
+{
+	if (nss_context)
+	{
+		NSS_ShutdownContext(nss_context);
+		nss_context = NULL;
+	}
+}
+
+PostgresPollingStatusType
+pgtls_open_client(PGconn *conn)
+{
+	SECStatus	status;
+	PRFileDesc *pr_fd;
+	PRFileDesc *model;
+	NSSInitParameters params;
+	SSLVersionRange desired_range;
+
+	/*
+	 * The NSPR documentation states that runtime initialization via PR_Init
+	 * is no longer required, as the first caller into NSPR will perform the
+	 * initialization implicitly. See be-secure-nss.c for further discussion
+	 * on PR_Init.
+	 */
+	PR_Init(PR_USER_THREAD, PR_PRIORITY_NORMAL, 0);
+
+	/*
+	 * NSS initialization and the use of contexts is further discussed in
+	 * be-secure-nss.c
+	 */
+	memset(&params, 0, sizeof(params));
+	params.length = sizeof(params);
+
+	if (conn->cert_database && strlen(conn->cert_database) > 0)
+	{
+		char	   *cert_database_path = psprintf("sql:%s", conn->cert_database);
+
+		nss_context = NSS_InitContext(cert_database_path, "", "", "",
+									  &params,
+									  NSS_INIT_READONLY | NSS_INIT_PK11RELOAD);
+		pfree(cert_database_path);
+	}
+	else
+		nss_context = NSS_InitContext("", "", "", "", &params,
+									  NSS_INIT_READONLY | NSS_INIT_NOCERTDB |
+									  NSS_INIT_NOMODDB | NSS_INIT_FORCEOPEN |
+									  NSS_INIT_NOROOTINIT | NSS_INIT_PK11RELOAD);
+
+	if (!nss_context)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to %s certificate database: %s"),
+						  conn->cert_database ? "open" : "create",
+						  pg_SSLerrmessage(PR_GetError()));
+
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * Configure cipher policy.
+	 */
+	status = NSS_SetDomesticPolicy();
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to configure cipher policy: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * If we don't have a certificate database, the system trust store is the
+	 * fallback we can use. If we fail to initialize that as well, we can
+	 * still attempt a connection as long as the sslmode isn't verify*.
+	 */
+	if (!conn->cert_database && conn->sslmode[0] == 'v')
+	{
+		status = pg_load_nss_module(&ca_trust, ca_trust_name, "\"Root Certificates\"");
+		if (status != SECSuccess)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("WARNING: unable to load NSS trust module \"%s\" : %s"),
+							  ca_trust_name,
+							  pg_SSLerrmessage(PR_GetError()));
+
+			return PGRES_POLLING_FAILED;
+		}
+	}
+
+
+	PK11_SetPasswordFunc(PQssl_passwd_cb);
+
+	/*
+	 * Import the already opened socket as we don't want to use NSPR functions
+	 * for opening the network socket due to how the PostgreSQL protocol works
+	 * with TLS connections. This function is not part of the NSPR public API,
+	 * see the comment at the top of the file for the rationale of still using
+	 * it.
+	 */
+	pr_fd = PR_ImportTCPSocket(conn->sock);
+	if (!pr_fd)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to attach to socket: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * Most of the documentation available, and implementations of, NSS/NSPR
+	 * use the PR_NewTCPSocket() function here, which has the drawback that it
+	 * can only create IPv4 sockets. Instead use PR_OpenTCPSocket() which
+	 * copes with IPv6 as well.
+	 */
+	model = SSL_ImportFD(NULL, PR_OpenTCPSocket(conn->laddr.addr.ss_family));
+	if (!model)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to enable TLS: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/* Disable old protocol versions (SSLv2 and SSLv3) */
+	SSL_OptionSet(model, SSL_ENABLE_SSL2, PR_FALSE);
+	SSL_OptionSet(model, SSL_V2_COMPATIBLE_HELLO, PR_FALSE);
+	SSL_OptionSet(model, SSL_ENABLE_SSL3, PR_FALSE);
+
+#ifdef SSL_CBC_RANDOM_IV
+
+	/*
+	 * Enable protection against the BEAST attack in case the NSS library has
+	 * support for that. While SSLv3 is disabled, we may still allow TLSv1
+	 * which is affected. The option isn't documented as an SSL option, but as
+	 * an NSS environment variable.
+	 */
+	SSL_OptionSet(model, SSL_CBC_RANDOM_IV, PR_TRUE);
+#endif
+
+	/* Set us up as a TLS client for the handshake */
+	SSL_OptionSet(model, SSL_HANDSHAKE_AS_CLIENT, PR_TRUE);
+
+	/*
+	 * When setting the available protocols, we either use the user defined
+	 * configuration values, and if missing we accept whatever is the highest
+	 * version supported by the library as the max and only limit the range in
+	 * the other end at TLSv1.0. ssl_variant_stream is a ProtocolVariant enum
+	 * for Stream protocols, rather than datagram.
+	 */
+	SSL_VersionRangeGetSupported(ssl_variant_stream, &desired_range);
+	desired_range.min = SSL_LIBRARY_VERSION_TLS_1_0;
+
+	if (conn->ssl_min_protocol_version && strlen(conn->ssl_min_protocol_version) > 0)
+	{
+		int			ssl_min_ver = ssl_protocol_version_to_nss(conn->ssl_min_protocol_version);
+
+		if (ssl_min_ver == -1)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("invalid value \"%s\" for minimum version of SSL protocol\n"),
+							  conn->ssl_min_protocol_version);
+			return -1;
+		}
+
+		desired_range.min = ssl_min_ver;
+	}
+
+	if (conn->ssl_max_protocol_version && strlen(conn->ssl_max_protocol_version) > 0)
+	{
+		int			ssl_max_ver = ssl_protocol_version_to_nss(conn->ssl_max_protocol_version);
+
+		if (ssl_max_ver == -1)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("invalid value \"%s\" for maximum version of SSL protocol\n"),
+							  conn->ssl_max_protocol_version);
+			return -1;
+		}
+
+		desired_range.max = ssl_max_ver;
+	}
+
+	if (SSL_VersionRangeSet(model, &desired_range) != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to set allowed SSL protocol version range: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * Set up callback for verifying server certificates, as well as for how
+	 * to handle failed verifications.
+	 */
+	SSL_AuthCertificateHook(model, pg_cert_auth_handler, (void *) conn);
+	SSL_BadCertHook(model, pg_bad_cert_handler, (void *) conn);
+
+	/*
+	 * Convert the NSPR socket to an SSL socket. Ensuring the success of this
+	 * operation is critical as NSS SSL_* functions may return SECSuccess on
+	 * the socket even though SSL hasn't been enabled, which introduce a risk
+	 * of silent downgrades.
+	 */
+	conn->pr_fd = SSL_ImportFD(model, pr_fd);
+	if (!conn->pr_fd)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to configure client for TLS: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * The model can now we closed as we've applied the settings of the model
+	 * onto the real socket. From hereon we should only use conn->pr_fd.
+	 */
+	PR_Close(model);
+
+	/* Set the private data to be passed to the password callback */
+	SSL_SetPKCS11PinArg(conn->pr_fd, (void *) conn);
+
+	/*
+	 * If a CRL file has been specified, verify if it exists in the database
+	 * but don't fail in case it doesn't.
+	 */
+	if (conn->sslcrl && strlen(conn->sslcrl) > 0)
+	{
+		/* XXX: Implement me.. */
+	}
+
+	status = SSL_ResetHandshake(conn->pr_fd, PR_FALSE);
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to initiate handshake: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * Set callback for client authentication when requested by the server.
+	 */
+	SSL_GetClientAuthDataHook(conn->pr_fd, pg_client_auth_handler, (void *) conn);
+
+	/*
+	 * Specify which hostname we are expecting to talk to. This is required,
+	 * albeit mostly applies to when opening a connection to a traditional
+	 * http server it seems.
+	 */
+	SSL_SetURL(conn->pr_fd, (conn->connhost[conn->whichhost]).host);
+
+	do
+	{
+		status = SSL_ForceHandshake(conn->pr_fd);
+	}
+	while (status != SECSuccess && PR_GetError() == PR_WOULD_BLOCK_ERROR);
+
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("SSL error: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	conn->ssl_in_use = true;
+	return PGRES_POLLING_OK;
+}
+
+ssize_t
+pgtls_read(PGconn *conn, void *ptr, size_t len)
+{
+	PRInt32		nread;
+	PRErrorCode status;
+	int			read_errno = 0;
+
+	/*
+	 * PR_Recv blocks until there is data to read or the timeout expires. We
+	 * don't want to sit blocked here, so the timeout is turned off by using
+	 * PR_INTERVAL_NO_WAIT which means "return immediately",  Zero is returned
+	 * for closed connections, while -1 indicates an error within the ongoing
+	 * connection.
+	 */
+	nread = PR_Recv(conn->pr_fd, ptr, len, 0, PR_INTERVAL_NO_WAIT);
+
+	if (nread == 0)
+	{
+		read_errno = ECONNRESET;
+		return -1;
+	}
+
+	if (nread == -1)
+	{
+		status = PR_GetError();
+
+		switch (status)
+		{
+			case PR_WOULD_BLOCK_ERROR:
+				read_errno = EWOULDBLOCK;
+				break;
+
+				/*
+				 * The error cases for PR_Recv are not documented, but can be
+				 * reverse engineered from _MD_unix_map_default_error() in the
+				 * NSPR code, defined in pr/src/md/unix/unix_errors.c.
+				 */
+			default:
+				read_errno = ECONNRESET;
+				break;
+		}
+
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("TLS read error: %s"),
+						  pg_SSLerrmessage(status));
+	}
+
+	SOCK_ERRNO_SET(read_errno);
+	return (ssize_t) nread;
+}
+
+/*
+ * pgtls_read_pending
+ *		Check for the existence of data to be read.
+ *
+ * This is part of the PostgreSQL TLS backend API.
+ */
+bool
+pgtls_read_pending(PGconn *conn)
+{
+	unsigned char c;
+	int			n;
+
+	/*
+	 * PR_Recv peeks into the stream with the timeount turned off, to see if
+	 * there is another byte to read off the wire. There is an NSS function
+	 * SSL_DataPending() which might seem like a better fit, but it will only
+	 * check already encrypted data in the SSL buffer, not still unencrypted
+	 * data, thus it doesn't guarantee that a subsequent call to
+	 * PR_Read/PR_Recv wont block.
+	 */
+	n = PR_Recv(conn->pr_fd, &c, 1, PR_MSG_PEEK, PR_INTERVAL_NO_WAIT);
+	return (n > 0);
+}
+
+ssize_t
+pgtls_write(PGconn *conn, const void *ptr, size_t len)
+{
+	PRInt32		n;
+	PRErrorCode status;
+	int			write_errno = 0;
+
+	n = PR_Write(conn->pr_fd, ptr, len);
+
+	if (n < 0)
+	{
+		status = PR_GetError();
+
+		switch (status)
+		{
+			case PR_WOULD_BLOCK_ERROR:
+#ifdef EAGAIN
+				write_errno = EAGAIN;
+#else
+				write_errno = EINTR;
+#endif
+				break;
+
+			default:
+				printfPQExpBuffer(&conn->errorMessage,
+								  libpq_gettext("TLS write error: %s"),
+								  pg_SSLerrmessage(status));
+				write_errno = ECONNRESET;
+				break;
+		}
+	}
+
+	SOCK_ERRNO_SET(write_errno);
+	return (ssize_t) n;
+}
+
+/*
+ *	Verify that the server certificate matches the hostname we connected to.
+ *
+ * The certificate's Common Name and Subject Alternative Names are considered.
+ */
+int
+pgtls_verify_peer_name_matches_certificate_guts(PGconn *conn,
+												int *names_examined,
+												char **first_name)
+{
+	char		   *server_hostname = NULL;
+	CERTCertificate *server_cert = NULL;
+	SECStatus status = SECSuccess;
+	SECItem			altname_item;
+	PLArenaPool	   *arena = NULL;
+	CERTGeneralName *san_list;
+	CERTGeneralName *cn;
+
+	server_hostname = SSL_RevealURL(conn->pr_fd);
+	if (!server_hostname || server_hostname[0] == '\0')
+		goto done;
+
+	/*
+	 * CERT_VerifyCertName will internally perform RFC 2818 SubjectAltName
+	 * verification.
+	 */
+	server_cert = SSL_PeerCertificate(conn->pr_fd);
+	status = CERT_VerifyCertName(server_cert, server_hostname);
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to verify server hostname: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		goto done;
+	}
+
+	status = CERT_FindCertExtension(server_cert, SEC_OID_X509_SUBJECT_ALT_NAME,
+									&altname_item);
+	if (status == SECSuccess)
+	{
+		arena = PORT_NewArena(DER_DEFAULT_CHUNKSIZE);
+		if (!arena)
+		{
+			status = SECFailure;
+			goto done;
+		}
+		san_list = CERT_DecodeAltNameExtension(arena, &altname_item);
+		if (!san_list)
+		{
+			status = SECFailure;
+			goto done;
+		}
+
+		for (cn = san_list; cn != san_list; cn = CERT_GetNextGeneralName(cn))
+		{
+			char	   *alt_name;
+			int			rv;
+			char		tmp[512];
+
+			status = CERT_RFC1485_EscapeAndQuote(tmp, sizeof(tmp),
+												 (char *) cn->name.other.data,
+												 cn->name.other.len);
+
+			if (status != SECSuccess)
+				goto done;
+
+			rv = pq_verify_peer_name_matches_certificate_name(conn, tmp,
+															  strlen(tmp),
+															  &alt_name);
+			if (alt_name)
+			{
+				if (!*first_name)
+					*first_name = alt_name;
+				else
+					free(alt_name);
+			}
+
+			if (rv == 1)
+				status = SECSuccess;
+			else
+			{
+				status = SECFailure;
+				break;
+			}
+		}
+	}
+	else if (PORT_GetError() == SEC_ERROR_EXTENSION_NOT_FOUND)
+		status = SECSuccess;
+	else
+		status = SECSuccess;
+
+done:
+	/* san_list will be freed by freeing the arena it was allocated in */
+	if (arena)
+		PORT_FreeArena(arena, PR_TRUE);
+	PR_Free(server_hostname);
+
+	if (status == SECSuccess)
+		return 1;
+
+	return 0;
+}
+
+/* ------------------------------------------------------------ */
+/*			PostgreSQL specific TLS support functions			*/
+/* ------------------------------------------------------------ */
+
+static const char *
+pg_SSLerrmessage(PRErrorCode errcode)
+{
+	const char *error;
+
+	error = PR_ErrorToName(errcode);
+	if (error)
+		return error;
+
+	return "unknown TLS error";
+}
+
+static SECStatus
+pg_load_nss_module(SECMODModule * *module, const char *library, const char *name)
+{
+	SECMODModule *mod;
+	char	   *modulespec;
+
+	modulespec = psprintf("library=\"%s\", name=\"%s\"", library, name);
+
+	/*
+	 * Attempt to load the specified module. The second parameter is "parent"
+	 * which should always be NULL for application code. The third parameter
+	 * defines if loading should recurse which is only applicable when loading
+	 * a module from within another module. This hierarchy would have to be
+	 * defined in the modulespec, and since we don't support anything but
+	 * directly addressed modules we should pass PR_FALSE.
+	 */
+	mod = SECMOD_LoadUserModule(modulespec, NULL, PR_FALSE);
+	pfree(modulespec);
+
+	if (mod && mod->loaded)
+	{
+		*module = mod;
+		return SECSuccess;
+	}
+
+	SECMOD_DestroyModule(mod);
+	return SECFailure;
+}
+
+/* ------------------------------------------------------------ */
+/*						NSS Callbacks							*/
+/* ------------------------------------------------------------ */
+
+/*
+ * pg_cert_auth_handler
+ *			Callback for authenticating server certificate
+ *
+ * This is pretty much the same procedure as the SSL_AuthCertificate function
+ * provided by NSS, with the difference being server hostname validation. With
+ * SSL_AuthCertificate there is no way to do verify-ca, it only does the -full
+ * flavor of our sslmodes, so we need our own implementation.
+ */
+static SECStatus
+pg_cert_auth_handler(void *arg, PRFileDesc *fd, PRBool checksig, PRBool isServer)
+{
+	SECStatus	status;
+	PGconn	   *conn = (PGconn *) arg;
+	CERTCertificate *server_cert;
+	void	   *pin;
+
+	Assert(!isServer);
+
+	pin = SSL_RevealPinArg(conn->pr_fd);
+	server_cert = SSL_PeerCertificate(conn->pr_fd);
+
+	status = CERT_VerifyCertificateNow((CERTCertDBHandle *) CERT_GetDefaultCertDB(),
+									   server_cert,
+									   checksig,
+									   certificateUsageSSLServer,
+									   pin,
+									   NULL);
+
+	/*
+	 * If we've already failed validation then there is no point in also
+	 * performing the hostname check for verify-full.
+	 */
+	if (status == SECSuccess)
+	{
+		if (!pq_verify_peer_name_matches_certificate(conn))
+			status = SECFailure;
+	}
+	else
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to verify certificate: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+	}
+
+	return status;
+}
+
+/*
+ * pg_client_auth_handler
+ *		Callback for client certificate validation
+ *
+ * The client auth callback is not on by default in NSS, so we need to invoke
+ * it ourselves to ensure we can do cert authentication. A TODO is to support
+ * running without a specified sslcert parameter. By retrieving all the certs
+ * via nickname from the cert database and see if we find one which apply with
+ * NSS_CmpCertChainWCANames() and PK11_FindKeyByAnyCert() we could support
+ * just running with a ssl database specified.
+ *
+ * For now, we use the default client certificate validation which requires a
+ * defined nickname to identify the cert in the database.
+ */
+static SECStatus
+pg_client_auth_handler(void *arg, PRFileDesc * socket, CERTDistNames * caNames,
+					   CERTCertificate * *pRetCert, SECKEYPrivateKey * *pRetKey)
+{
+	PGconn	   *conn = (PGconn *) arg;
+
+	return NSS_GetClientAuthData(conn->sslcert, socket, caNames, pRetCert, pRetKey);
+}
+
+/*
+ * pg_bad_cert_handler
+ *		Callback for failed certificate validation
+ *
+ * The TLS handshake will call this function iff the server certificate failed
+ * validation. Depending on the sslmode, we allow the connection anyways.
+ */
+static SECStatus
+pg_bad_cert_handler(void *arg, PRFileDesc * fd)
+{
+	PGconn	   *conn = (PGconn *) arg;
+	PRErrorCode err;
+
+	/*
+	 * This really shouldn't happen, as we've the the PGconn object as our
+	 * callback data, and at the callsite we know it will be populated. That
+	 * being said, the NSS code itself performs this check even when it should
+	 * not be required so let's use the same belts with our suspenders.
+	 */
+	if (!arg)
+		return SECFailure;
+
+	/*
+	 * For sslmodes other than verify-full and verify-ca we don't perform peer
+	 * validation, so return immediately.  sslmode require with a database
+	 * specified which contains a CA certificate will work like verify-ca to
+	 * be compatible with the OpenSSL implementation.
+	 */
+	if (strcmp(conn->sslmode, "require") == 0)
+	{
+		if (conn->cert_database && strlen(conn->cert_database) > 0 && cert_database_has_CA(conn))
+			return SECFailure;
+	}
+	if (conn->sslmode[0] == 'v')
+		return SECFailure;
+
+	err = PORT_GetError();
+
+	/*
+	 * TODO: these are relevant error codes that can occur in certificate
+	 * validation, figure out which we dont want for require/prefer etc.
+	 */
+	switch (err)
+	{
+		case SEC_ERROR_INVALID_AVA:
+		case SEC_ERROR_INVALID_TIME:
+		case SEC_ERROR_BAD_SIGNATURE:
+		case SEC_ERROR_EXPIRED_CERTIFICATE:
+		case SEC_ERROR_UNKNOWN_ISSUER:
+		case SEC_ERROR_UNTRUSTED_ISSUER:
+		case SEC_ERROR_UNTRUSTED_CERT:
+		case SEC_ERROR_CERT_VALID:
+		case SEC_ERROR_EXPIRED_ISSUER_CERTIFICATE:
+		case SEC_ERROR_CRL_EXPIRED:
+		case SEC_ERROR_CRL_BAD_SIGNATURE:
+		case SEC_ERROR_EXTENSION_VALUE_INVALID:
+		case SEC_ERROR_CA_CERT_INVALID:
+		case SEC_ERROR_CERT_USAGES_INVALID:
+		case SEC_ERROR_UNKNOWN_CRITICAL_EXTENSION:
+			return SECSuccess;
+			break;
+		default:
+			return SECFailure;
+			break;
+	}
+
+	/* Unreachable */
+	return SECSuccess;
+}
+
+/* ------------------------------------------------------------ */
+/*					SSL information functions					*/
+/* ------------------------------------------------------------ */
+
+/*
+ * PQgetssl
+ *
+ * Return NULL as this is legacy and defined to always be equal to calling
+ * PQsslStruct(conn, "OpenSSL"); This should ideally trigger a logged warning
+ * somewhere as it's nonsensical to run in a non-OpenSSL build, but the color
+ * of said bikeshed hasn't yet been determined.
+ */
+void *
+PQgetssl(PGconn *conn)
+{
+	return NULL;
+}
+
+void *
+PQsslStruct(PGconn *conn, const char *struct_name)
+{
+	if (!conn)
+		return NULL;
+
+	/*
+	 * Return the underlying PRFileDesc which can be used to access
+	 * information on the connection details. There is no SSL context per se.
+	 */
+	if (strcmp(struct_name, "NSS") == 0)
+		return conn->pr_fd;
+	return NULL;
+}
+
+const char *const *
+PQsslAttributeNames(PGconn *conn)
+{
+	static const char *const result[] = {
+		"library",
+		"cipher",
+		"protocol",
+		"key_bits",
+		"compression",
+		NULL
+	};
+
+	return result;
+}
+
+const char *
+PQsslAttribute(PGconn *conn, const char *attribute_name)
+{
+	SECStatus	status;
+	SSLChannelInfo channel;
+	SSLCipherSuiteInfo suite;
+
+	if (!conn || !conn->pr_fd)
+		return NULL;
+
+	if (strcmp(attribute_name, "library") == 0)
+		return "NSS";
+
+	status = SSL_GetChannelInfo(conn->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+		return NULL;
+
+	status = SSL_GetCipherSuiteInfo(channel.cipherSuite, &suite, sizeof(suite));
+	if (status != SECSuccess)
+		return NULL;
+
+	if (strcmp(attribute_name, "cipher") == 0)
+		return suite.cipherSuiteName;
+
+	if (strcmp(attribute_name, "key_bits") == 0)
+	{
+		static char key_bits_str[8];
+
+		snprintf(key_bits_str, sizeof(key_bits_str), "%i", suite.effectiveKeyBits);
+		return key_bits_str;
+	}
+
+	if (strcmp(attribute_name, "protocol") == 0)
+	{
+		switch (channel.protocolVersion)
+		{
+#ifdef SSL_LIBRARY_VERSION_TLS_1_3
+			case SSL_LIBRARY_VERSION_TLS_1_3:
+				return "TLSv1.3";
+#endif
+#ifdef SSL_LIBRARY_VERSION_TLS_1_2
+			case SSL_LIBRARY_VERSION_TLS_1_2:
+				return "TLSv1.2";
+#endif
+#ifdef SSL_LIBRARY_VERSION_TLS_1_1
+			case SSL_LIBRARY_VERSION_TLS_1_1:
+				return "TLSv1.1";
+#endif
+			case SSL_LIBRARY_VERSION_TLS_1_0:
+				return "TLSv1.0";
+			default:
+				return "unknown";
+		}
+	}
+
+	/*
+	 * NSS disabled support for compression in version 3.33, and it was only
+	 * available for SSLv3 at that point anyways, so we can safely return off
+	 * here without checking.
+	 */
+	if (strcmp(attribute_name, "compression") == 0)
+		return "off";
+
+	return NULL;
+}
+
+static int
+ssl_protocol_version_to_nss(const char *protocol)
+{
+	if (pg_strcasecmp("TLSv1", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_0;
+
+#ifdef SSL_LIBRARY_VERSION_TLS_1_1
+	if (pg_strcasecmp("TLSv1.1", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_1;
+#endif
+
+#ifdef SSL_LIBRARY_VERSION_TLS_1_2
+	if (pg_strcasecmp("TLSv1.2", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_2;
+#endif
+
+#ifdef SSL_LIBRARY_VERSION_TLS_1_3
+	if (pg_strcasecmp("TLSv1.3", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_3;
+#endif
+
+	return -1;
+}
+
+static bool
+cert_database_has_CA(PGconn *conn)
+{
+	CERTCertList *certificates;
+	bool		hasCA;
+
+	/*
+	 * If the certificate database has a password we must provide it, since
+	 * this API doesn't invoke the standard password callback.
+	 */
+	if (has_password)
+		certificates = PK11_ListCerts(PK11CertListCA, PQssl_passwd_cb(NULL, PR_FALSE, (void *) conn));
+	else
+		certificates = PK11_ListCerts(PK11CertListCA, NULL);
+	hasCA = !CERT_LIST_EMPTY(certificates);
+	CERT_DestroyCertList(certificates);
+
+	return hasCA;
+}
+
+PQsslKeyPassHook_nss_type
+PQgetSSLKeyPassHook_nss(void)
+{
+	return PQsslKeyPassHook;
+}
+
+void
+PQsetSSLKeyPassHook_nss(PQsslKeyPassHook_nss_type hook)
+{
+	PQsslKeyPassHook = hook;
+}
+
+/*
+ * Supply a password to decrypt a client certificate.
+ *
+ * This must match NSS type PK11PasswordFunc.
+ */
+static char *
+PQssl_passwd_cb(PK11SlotInfo * slot, PRBool retry, void *arg)
+{
+	has_password = true;
+
+	if (PQsslKeyPassHook)
+		return PQsslKeyPassHook(slot, (PRBool) retry, arg);
+	else
+		return PQdefaultSSLKeyPassHook_nss(slot, retry, arg);
+}
+
+/*
+ * The default password handler callback.
+ */
+char *
+PQdefaultSSLKeyPassHook_nss(PK11SlotInfo * slot, PRBool retry, void *arg)
+{
+	PGconn	   *conn = (PGconn *) arg;
+
+	/*
+	 * If the password didn't work the first time there is no point in
+	 * retrying as it hasn't changed.
+	 */
+	if (retry != PR_TRUE && conn->sslpassword && strlen(conn->sslpassword) > 0)
+		return PORT_Strdup(conn->sslpassword);
+
+	return NULL;
+}
diff --git a/src/interfaces/libpq/fe-secure.c b/src/interfaces/libpq/fe-secure.c
index 97c3805303..dd6ee15c5a 100644
--- a/src/interfaces/libpq/fe-secure.c
+++ b/src/interfaces/libpq/fe-secure.c
@@ -427,6 +427,9 @@ PQsslAttributeNames(PGconn *conn)
 
 	return result;
 }
+#endif /* USE_SSL */
+
+#ifndef USE_OPENSSL
 
 PQsslKeyPassHook_OpenSSL_type
 PQgetSSLKeyPassHook_OpenSSL(void)
@@ -445,7 +448,7 @@ PQdefaultSSLKeyPassHook_OpenSSL(char *buf, int size, PGconn *conn)
 {
 	return 0;
 }
-#endif							/* USE_SSL */
+#endif							/* USE_OPENSSL */
 
 /* Dummy version of GSSAPI information functions, when built without GSS support */
 #ifndef ENABLE_GSS
diff --git a/src/interfaces/libpq/libpq-fe.h b/src/interfaces/libpq/libpq-fe.h
index 3b6a9fbce3..27c16e187f 100644
--- a/src/interfaces/libpq/libpq-fe.h
+++ b/src/interfaces/libpq/libpq-fe.h
@@ -625,6 +625,17 @@ extern PQsslKeyPassHook_OpenSSL_type PQgetSSLKeyPassHook_OpenSSL(void);
 extern void PQsetSSLKeyPassHook_OpenSSL(PQsslKeyPassHook_OpenSSL_type hook);
 extern int	PQdefaultSSLKeyPassHook_OpenSSL(char *buf, int size, PGconn *conn);
 
+/* == in fe-secure-nss.c === */
+typedef struct PK11SlotInfoStr PK11SlotInfo;
+typedef int PRIntn;
+typedef PRIntn PRBool;
+
+/* Support for overriding sslpassword handling with a callback. */
+typedef char *(*PQsslKeyPassHook_nss_type) (PK11SlotInfo * slot, PRBool retry, void *arg);
+extern PQsslKeyPassHook_nss_type PQgetSSLKeyPassHook_nss(void);
+extern void PQsetSSLKeyPassHook_nss(PQsslKeyPassHook_nss_type hook);
+extern char *PQdefaultSSLKeyPassHook_nss(PK11SlotInfo * slot, PRBool retry, void *arg);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/src/interfaces/libpq/libpq-int.h b/src/interfaces/libpq/libpq-int.h
index 1de91ae295..12717ca720 100644
--- a/src/interfaces/libpq/libpq-int.h
+++ b/src/interfaces/libpq/libpq-int.h
@@ -362,6 +362,7 @@ struct pg_conn
 	char	   *sslpassword;	/* client key file password */
 	char	   *sslrootcert;	/* root certificate filename */
 	char	   *sslcrl;			/* certificate revocation list filename */
+	char	   *cert_database;
 	char	   *requirepeer;	/* required peer credentials for local sockets */
 	char	   *gssencmode;		/* GSS mode (require,prefer,disable) */
 	char	   *krbsrvname;		/* Kerberos service name */
@@ -485,6 +486,10 @@ struct pg_conn
 								 * OpenSSL version changes */
 #endif
 #endif							/* USE_OPENSSL */
+
+#ifdef USE_NSS
+	void	   *pr_fd;
+#endif							/* USE_NSS */
 #endif							/* USE_SSL */
 
 #ifdef ENABLE_GSS
diff --git a/src/port/pg_strong_random.c b/src/port/pg_strong_random.c
index 14e8382cd8..33af92a60b 100644
--- a/src/port/pg_strong_random.c
+++ b/src/port/pg_strong_random.c
@@ -30,6 +30,20 @@
 #ifdef USE_WIN32_RANDOM
 #include <wincrypt.h>
 #endif
+#ifdef USE_NSS_RANDOM
+#define pg_BITS_PER_BYTE BITS_PER_BYTE
+#undef BITS_PER_BYTE
+#include <nss/nss.h>
+#include <nss/pk11pub.h>
+#if defined(BITS_PER_BYTE)
+#if BITS_PER_BYTE != pg_BITS_PER_BYTE
+#error "incompatible byte widths between NSPR and postgres"
+#endif
+#else
+#define BITS_PER_BYTE pg_BITS_PER_BYTE
+#endif
+#undef pg_BITS_PER_BYTE
+#endif
 
 #ifdef USE_WIN32_RANDOM
 /*
@@ -158,6 +172,29 @@ pg_strong_random(void *buf, size_t len)
 	}
 	return false;
 
+#elif defined(USE_NSS_RANDOM)
+	NSSInitParameters params;
+	NSSInitContext *nss_context;
+	SECStatus status;
+
+	memset(&params, 0, sizeof(params));
+	params.length = sizeof(params);
+	nss_context = NSS_InitContext("", "", "", "", &params,
+							  NSS_INIT_READONLY | NSS_INIT_NOCERTDB |
+							  NSS_INIT_NOMODDB | NSS_INIT_FORCEOPEN |
+							  NSS_INIT_NOROOTINIT | NSS_INIT_PK11RELOAD);
+
+	if (!nss_context)
+		return false;
+
+	status = PK11_GenerateRandom(buf, len);
+	NSS_ShutdownContext(nss_context);
+
+	if (status == SECSuccess)
+		return true;
+
+	return false;
+
 	/*
 	 * Read /dev/urandom ourselves.
 	 */
diff --git a/src/test/Makefile b/src/test/Makefile
index 9774f534d9..a09c350939 100644
--- a/src/test/Makefile
+++ b/src/test/Makefile
@@ -27,7 +27,7 @@ ifneq (,$(filter ldap,$(PG_TEST_EXTRA)))
 SUBDIRS += ldap
 endif
 endif
-ifeq ($(with_openssl),yes)
+ifeq ($(with_ssl),yes)
 ifneq (,$(filter ssl,$(PG_TEST_EXTRA)))
 SUBDIRS += ssl
 endif
diff --git a/src/test/ssl/Makefile b/src/test/ssl/Makefile
index 777ee39413..4af971ef77 100644
--- a/src/test/ssl/Makefile
+++ b/src/test/ssl/Makefile
@@ -14,6 +14,7 @@ top_builddir = ../../..
 include $(top_builddir)/src/Makefile.global
 
 export with_openssl
+export with_nss
 
 CERTIFICATES := server_ca server-cn-and-alt-names \
 	server-cn-only server-single-alt-name server-multiple-alt-names \
@@ -30,6 +31,32 @@ SSLFILES := $(CERTIFICATES:%=ssl/%.key) $(CERTIFICATES:%=ssl/%.crt) \
 	ssl/client+client_ca.crt ssl/client-der.key \
 	ssl/client-encrypted-pem.key ssl/client-encrypted-der.key
 
+# Even though we in practice could get away with far fewer NSS databases, they
+# are generated to mimick the setup for the OpenSSL tests in order to ensure
+# we isolate the same behavior between the backends. The database name should
+# contain the files included for easier test suite code reading.
+NSSFILES := ssl/nss/client_ca.crt.db \
+	ssl/nss/server_ca.crt.db \
+	ssl/nss/root+server_ca.crt.db \
+	ssl/nss/root+client_ca.crt.db \
+	ssl/nss/client.crt__client.key.db \
+	ssl/nss/client-revoked.crt__client-revoked.key.db \
+	ssl/nss/server-cn-only.crt__server-password.key.db \
+	ssl/nss/server-cn-only.crt__server-cn-only.key.db \
+	ssl/nss/root.crl \
+	ssl/nss/server.crl \
+	ssl/nss/client.crl \
+	ssl/nss/server-multiple-alt-names.crt__server-multiple-alt-names.key.db \
+	ssl/nss/server-single-alt-name.crt__server-single-alt-name.key.db \
+	ssl/nss/server-cn-and-alt-names.crt__server-cn-and-alt-names.key.db \
+	ssl/nss/server-no-names.crt__server-no-names.key.db \
+	ssl/nss/server-revoked.crt__server-revoked.key.db \
+	ssl/nss/root+client.crl \
+	ssl/nss/client+client_ca.crt__client.key.db \
+	ssl/nss/client.crt__client-encrypted-pem.key.db \
+	ssl/nss/root+server_ca.crt__server.crl.db \
+	ssl/nss/root+server_ca.crt__root+server.crl.db
+
 # This target re-generates all the key and certificate files. Usually we just
 # use the ones that are committed to the tree without rebuilding them.
 #
@@ -37,6 +64,10 @@ SSLFILES := $(CERTIFICATES:%=ssl/%.key) $(CERTIFICATES:%=ssl/%.crt) \
 #
 sslfiles: $(SSLFILES)
 
+# Generate NSS certificate databases corresponding to the OpenSSL certificates.
+# This target will fail unless preceded by nssfiles-clean.
+nssfiles: $(NSSFILES)
+
 # OpenSSL requires a directory to put all generated certificates in. We don't
 # use this for anything, but we need a location.
 ssl/new_certs_dir:
@@ -64,6 +95,24 @@ ssl/%_ca.crt: ssl/%_ca.key %_ca.config ssl/root_ca.crt ssl/new_certs_dir
 	rm ssl/temp_ca.crt ssl/temp_ca_signed.crt
 	echo "01" > ssl/$*_ca.srl
 
+ssl/nss/%_ca.crt.db: ssl/%_ca.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n $*_ca.crt -i ssl/$*_ca.crt -t "CT,C,C"
+
+ssl/nss/root+server_ca.crt__server.crl.db: ssl/root+server_ca.crt ssl/nss/server.crl
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	crlutil -I -i ssl/nss/server.crl -d $@ -B
+
+ssl/nss/root+server_ca.crt__root+server.crl.db: ssl/root+server_ca.crt ssl/nss/root.crl ssl/nss/server.crl
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	crlutil -I -i ssl/nss/root.crl -d $@ -B
+	crlutil -I -i ssl/nss/server.crl -d $@ -B
+
 # Server certificates, signed by server CA:
 ssl/server-%.crt: ssl/server-%.key ssl/server_ca.crt server-%.config
 	openssl req -new -key ssl/server-$*.key -out ssl/server-$*.csr -config server-$*.config
@@ -77,6 +126,78 @@ ssl/server-ss.crt: ssl/server-cn-only.key ssl/server-cn-only.crt server-cn-only.
 	openssl x509 -req -days 10000 -in ssl/server-ss.csr -signkey ssl/server-cn-only.key -out ssl/server-ss.crt  -extensions v3_req -extfile server-cn-only.config
 	rm ssl/server-ss.csr
 
+# pk12util won't preserve the password when importing the password protected
+# key, the password must be set on the database *before* importing it as the
+# password in the pkcs12 envelope will be dropped.
+ssl/nss/server-cn-only.crt__server-password.key.db: ssl/server-cn-only.crt
+	$(MKDIR_P) $@
+	echo "secret1" > password.txt
+	certutil -d "sql:$@" -N -f password.txt
+	certutil -d "sql:$@" -A -n ssl/server-cn-only.crt -i ssl/server-cn-only.crt -t "CT,C,C" -f password.txt
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C" -f password.txt
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C" -f password.txt
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C" -f password.txt
+	openssl pkcs12 -export -out ssl/nss/server-password.pfx -inkey ssl/server-password.key -in ssl/server-cn-only.crt -certfile ssl/server_ca.crt -passin 'pass:secret1' -passout 'pass:secret1'
+	pk12util -i ssl/nss/server-password.pfx -d $@ -W 'secret1' -K 'secret1'
+
+ssl/nss/server-cn-only.crt__server-cn-only.key.db: ssl/server-cn-only.crt ssl/server-cn-only.key
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-cn-only.crt -i ssl/server-cn-only.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-cn-only.pfx -inkey ssl/server-cn-only.key -in ssl/server-cn-only.crt -certfile ssl/server_ca.crt -passout pass:
+	pk12util -i ssl/nss/server-cn-only.pfx -d $@ -W ''
+
+ssl/nss/server-multiple-alt-names.crt__server-multiple-alt-names.key.db: ssl/server-multiple-alt-names.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-multiple-alt-names.crt -i ssl/server-multiple-alt-names.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-multiple-alt-names.pfx -inkey ssl/server-multiple-alt-names.key -in ssl/server-multiple-alt-names.crt -certfile ssl/server-multiple-alt-names.crt -passout pass:
+	pk12util -i ssl/nss/server-multiple-alt-names.pfx -d $@ -W ''
+
+ssl/nss/server-single-alt-name.crt__server-single-alt-name.key.db: ssl/server-single-alt-name.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-single-alt-name.crt -i ssl/server-single-alt-name.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-single-alt-name.pfx -inkey ssl/server-single-alt-name.key -in ssl/server-single-alt-name.crt -certfile ssl/server-single-alt-name.crt -passout pass:
+	pk12util -i ssl/nss/server-single-alt-name.pfx -d $@ -W ''
+
+ssl/nss/server-cn-and-alt-names.crt__server-cn-and-alt-names.key.db: ssl/server-cn-and-alt-names.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-cn-and-alt-names.crt -i ssl/server-cn-and-alt-names.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-cn-and-alt-names.pfx -inkey ssl/server-cn-and-alt-names.key -in ssl/server-cn-and-alt-names.crt -certfile ssl/server-cn-and-alt-names.crt -passout pass:
+	pk12util -i ssl/nss/server-cn-and-alt-names.pfx -d $@ -W ''
+
+ssl/nss/server-no-names.crt__server-no-names.key.db: ssl/server-no-names.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-no-names.crt -i ssl/server-no-names.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-no-names.pfx -inkey ssl/server-no-names.key -in ssl/server-no-names.crt -certfile ssl/server-no-names.crt -passout pass:
+	pk12util -i ssl/nss/server-no-names.pfx -d $@ -W ''
+
+ssl/nss/server-revoked.crt__server-revoked.key.db: ssl/server-revoked.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-revoked.crt -i ssl/server-revoked.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-revoked.pfx -inkey ssl/server-revoked.key -in ssl/server-revoked.crt -certfile ssl/server-revoked.crt -passout pass:
+	pk12util -i ssl/nss/server-revoked.pfx -d $@ -W ''
+
 # Password-protected version of server-cn-only.key
 ssl/server-password.key: ssl/server-cn-only.key
 	openssl rsa -aes256 -in $< -out $@ -passout 'pass:secret1'
@@ -88,6 +209,27 @@ ssl/client.crt: ssl/client.key ssl/client_ca.crt
 	openssl x509 -in ssl/temp.crt -out ssl/client.crt # to keep just the PEM cert
 	rm ssl/client.csr ssl/temp.crt
 
+# Client certificate, signed by client CA
+ssl/nss/client.crt__client.key.db: ssl/client.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/client.crt -i ssl/client.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root+client_ca.crt -i ssl/root+client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client.pfx -inkey ssl/client.key -in ssl/client.crt -certfile ssl/client_ca.crt -passout pass:
+	pk12util -i ssl/nss/client.pfx -d $@ -W ''
+
+# Client certificate with encrypted key, signed by client CA
+ssl/nss/client.crt__client-encrypted-pem.key.db: ssl/client.crt
+	$(MKDIR_P) $@
+	echo 'dUmmyP^#+' > $@.pass
+	certutil -d "sql:$@" -N -f $@.pass
+	certutil -d "sql:$@" -A -f $@.pass -n ssl/client.crt -i ssl/client.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -f $@.pass -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -f $@.pass -n root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client-encrypted-pem.pfx -inkey ssl/client-encrypted-pem.key -in ssl/client.crt -certfile ssl/client_ca.crt -passin pass:'dUmmyP^#+' -passout pass:'dUmmyP^#+'
+	pk12util -i ssl/nss/client-encrypted-pem.pfx -d $@ -W 'dUmmyP^#+' -k $@.pass
+
 # Another client certificate, signed by the client CA. This one is revoked.
 ssl/client-revoked.crt: ssl/client-revoked.key ssl/client_ca.crt client.config
 	openssl req -new -key ssl/client-revoked.key -out ssl/client-revoked.csr -config client.config
@@ -95,6 +237,14 @@ ssl/client-revoked.crt: ssl/client-revoked.key ssl/client_ca.crt client.config
 	openssl x509 -in ssl/temp.crt -out ssl/client-revoked.crt # to keep just the PEM cert
 	rm ssl/client-revoked.csr ssl/temp.crt
 
+ssl/nss/client-revoked.crt__client-revoked.key.db: ssl/client-revoked.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/client-revoked.crt -i ssl/client-revoked.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client-revoked.pfx -inkey ssl/client-revoked.key -in ssl/client-revoked.crt -certfile ssl/client_ca.crt -passout pass:
+	pk12util -i ssl/nss/client-revoked.pfx -d $@ -W ''
+
 # Convert the key to DER, to test our behaviour there too
 ssl/client-der.key: ssl/client.key
 	openssl rsa -in ssl/client.key -outform DER -out ssl/client-der.key
@@ -127,19 +277,40 @@ ssl/root+client_ca.crt: ssl/root_ca.crt ssl/client_ca.crt
 ssl/client+client_ca.crt: ssl/client.crt ssl/client_ca.crt
 	cat $^ > $@
 
+# Client certificate, signed by client CA
+ssl/nss/client+client_ca.crt__client.key.db: ssl/client+client_ca.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/client+client_ca.crt -i ssl/client+client_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n ssl/root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client.pfx -inkey ssl/client.key -in ssl/client.crt -certfile ssl/client_ca.crt -passout pass:
+	pk12util -i ssl/nss/client.pfx -d $@ -W ''
+
 #### CRLs
 
 ssl/client.crl: ssl/client-revoked.crt
 	openssl ca -config cas.config -name client_ca -revoke ssl/client-revoked.crt
 	openssl ca -config cas.config -name client_ca -gencrl -out ssl/client.crl
 
+ssl/nss/client.crl: ssl/client.crl
+	openssl crl -in $^ -outform der -out $@
+
 ssl/server.crl: ssl/server-revoked.crt
 	openssl ca -config cas.config -name server_ca -revoke ssl/server-revoked.crt
 	openssl ca -config cas.config -name server_ca -gencrl -out ssl/server.crl
 
+ssl/nss/server.crl: ssl/server.crl
+	openssl crl -in $^ -outform der -out $@
+
 ssl/root.crl: ssl/root_ca.crt
 	openssl ca -config cas.config -name root_ca -gencrl -out ssl/root.crl
 
+ssl/nss/root.crl: ssl/root.crl
+	openssl crl -in $^ -outform der -out $@
+
+ssl/nss/root+client.crl: ssl/root+client.crl
+	openssl crl -in $^ -outform der -out $@
+
 # If a CRL is used, OpenSSL requires a CRL file for *all* the CAs in the
 # chain, even if some of them are empty.
 ssl/root+server.crl: ssl/root.crl ssl/server.crl
@@ -151,9 +322,14 @@ ssl/root+client.crl: ssl/root.crl ssl/client.crl
 sslfiles-clean:
 	rm -f $(SSLFILES) ssl/client_ca.srl ssl/server_ca.srl ssl/client_ca-certindex* ssl/server_ca-certindex* ssl/root_ca-certindex* ssl/root_ca.srl ssl/temp_ca.crt ssl/temp_ca_signed.crt
 
+.PHONY: nssfiles-clean
+nssfiles-clean:
+	rm -rf ssl/nss
+
 clean distclean maintainer-clean:
 	rm -rf tmp_check
 	rm -rf ssl/*.old ssl/new_certs_dir ssl/client*_tmp.key
+	rm -rf ssl/nss
 
 # Doesn't depend on $(SSLFILES) because we don't rebuild them by default
 check:
diff --git a/src/test/ssl/t/001_ssltests.pl b/src/test/ssl/t/001_ssltests.pl
index fd2727b568..ff9c8ae3f3 100644
--- a/src/test/ssl/t/001_ssltests.pl
+++ b/src/test/ssl/t/001_ssltests.pl
@@ -4,17 +4,24 @@ use PostgresNode;
 use TestLib;
 use Test::More;
 
-use File::Copy;
-
 use FindBin;
 use lib $FindBin::RealBin;
 
-use SSLServer;
+use SSL::Server;
+
+my $openssl;
+my $nss;
 
 if ($ENV{with_openssl} eq 'yes')
 {
+	$openssl = 1;
 	plan tests => 93;
 }
+elsif ($ENV{with_nss} eq 'yes')
+{
+	$nss = 1;
+	plan tests => 98;
+}
 else
 {
 	plan skip_all => 'SSL not supported by this build';
@@ -32,32 +39,6 @@ my $SERVERHOSTCIDR = '127.0.0.1/32';
 # Allocation of base connection string shared among multiple tests.
 my $common_connstr;
 
-# The client's private key must not be world-readable, so take a copy
-# of the key stored in the code tree and update its permissions.
-#
-# This changes ssl/client.key to ssl/client_tmp.key etc for the rest
-# of the tests.
-my @keys = (
-	"client",     "client-revoked",
-	"client-der", "client-encrypted-pem",
-	"client-encrypted-der");
-foreach my $key (@keys)
-{
-	copy("ssl/${key}.key", "ssl/${key}_tmp.key")
-	  or die
-	  "couldn't copy ssl/${key}.key to ssl/${key}_tmp.key for permissions change: $!";
-	chmod 0600, "ssl/${key}_tmp.key"
-	  or die "failed to change permissions on ssl/${key}_tmp.key: $!";
-}
-
-# Also make a copy of that explicitly world-readable.  We can't
-# necessarily rely on the file in the source tree having those
-# permissions.  Add it to @keys to include it in the final clean
-# up phase.
-copy("ssl/client.key", "ssl/client_wrongperms_tmp.key");
-chmod 0644, "ssl/client_wrongperms_tmp.key";
-push @keys, 'client_wrongperms';
-
 #### Set up the server.
 
 note "setting up data directory";
@@ -72,36 +53,65 @@ $node->start;
 
 # Run this before we lock down access below.
 my $result = $node->safe_psql('postgres', "SHOW ssl_library");
-is($result, 'OpenSSL', 'ssl_library parameter');
+is($result, SSL::Server::ssl_library(), 'ssl_library parameter');
 
 configure_test_server_for_ssl($node, $SERVERHOSTADDR, $SERVERHOSTCIDR,
 	'trust');
 
 note "testing password-protected keys";
 
-open my $sslconf, '>', $node->data_dir . "/sslconfig.conf";
-print $sslconf "ssl=on\n";
-print $sslconf "ssl_cert_file='server-cn-only.crt'\n";
-print $sslconf "ssl_key_file='server-password.key'\n";
-print $sslconf "ssl_passphrase_command='echo wrongpassword'\n";
-close $sslconf;
+# Since the passphrase callbacks operate at different stages in OpenSSL and
+# NSS we have two separate blocks for them.
+SKIP:
+{
+	skip "Certificate passphrases aren't checked on server restart in NSS", 2
+	  if ($nss);
+
+	set_server_cert($node, 'server-cn-only', 'root+client_ca',
+					   'server-password', 'echo wrongpassword');
+	command_fails(
+		[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
+		'restart fails with password-protected key file with wrong password');
+	$node->_update_pid(0);
+
+	set_server_cert($node, 'server-cn-only', 'root+client_ca',
+					'server-password', 'echo secret1');
+	command_ok(
+		[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
+		'restart succeeds with password-protected key file');
+	$node->_update_pid(1);
+}
 
-command_fails(
-	[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
-	'restart fails with password-protected key file with wrong password');
-$node->_update_pid(0);
+SKIP:
+{
+	skip "Certificate passphrases are checked on connection in NSS", 5
+	  if ($openssl);
 
-open $sslconf, '>', $node->data_dir . "/sslconfig.conf";
-print $sslconf "ssl=on\n";
-print $sslconf "ssl_cert_file='server-cn-only.crt'\n";
-print $sslconf "ssl_key_file='server-password.key'\n";
-print $sslconf "ssl_passphrase_command='echo secret1'\n";
-close $sslconf;
+	set_server_cert($node, 'server-cn-only', 'root+client_ca',
+					   'server-password', 'echo wrongpassword');
+	command_ok(
+		[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
+		'restart fails with password-protected key file with wrong password');
+	$node->_update_pid(1);
 
-command_ok(
-	[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
-	'restart succeeds with password-protected key file');
-$node->_update_pid(1);
+	test_connect_fails(
+		"user=ssltestuser dbname=trustdb sslcert=invalid hostaddr=$SERVERHOSTADDR host=common-name.pg-ssltest.test",
+		"sslrootcert=invalid sslmode=require",
+		qr/\QSSL error\E/,
+		"connect to server with incorrect key password configured");
+
+	set_server_cert($node, 'server-cn-only', 'root+client_ca',
+					   'server-password', 'echo secret1');
+	command_ok(
+		[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
+		'restart fails with password-protected key file with wrong password');
+	$node->_update_pid(1);
+
+	test_connect_ok(
+		"user=ssltestuser dbname=trustdb sslcert=invalid hostaddr=$SERVERHOSTADDR host=common-name.pg-ssltest.test",
+		"sslrootcert=invalid sslmode=require",
+		"connect to server with correct key password configured");
+}
 
 # Test compatibility of SSL protocols.
 # TLSv1.1 is lower than TLSv1.2, so it won't work.
@@ -149,82 +159,105 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"sslrootcert=invalid sslmode=verify-ca",
-	qr/root certificate file "invalid" does not exist/,
+	qr/root certificate file "invalid" does not exist|could not connect to server/,
 	"connect without server root cert sslmode=verify-ca");
 test_connect_fails(
 	$common_connstr,
 	"sslrootcert=invalid sslmode=verify-full",
-	qr/root certificate file "invalid" does not exist/,
+	qr/root certificate file "invalid" does not exist|could not connect to server/,
 	"connect without server root cert sslmode=verify-full");
 
 # Try with wrong root cert, should fail. (We're using the client CA as the
 # root, but the server's key is signed by the server CA.)
-test_connect_fails($common_connstr,
-	"sslrootcert=ssl/client_ca.crt sslmode=require",
-	qr/SSL error/, "connect with wrong server root cert sslmode=require");
-test_connect_fails($common_connstr,
-	"sslrootcert=ssl/client_ca.crt sslmode=verify-ca",
-	qr/SSL error/, "connect with wrong server root cert sslmode=verify-ca");
-test_connect_fails($common_connstr,
-	"sslrootcert=ssl/client_ca.crt sslmode=verify-full",
-	qr/SSL error/, "connect with wrong server root cert sslmode=verify-full");
-
-# Try with just the server CA's cert. This fails because the root file
-# must contain the whole chain up to the root CA.
-test_connect_fails($common_connstr,
-	"sslrootcert=ssl/server_ca.crt sslmode=verify-ca",
-	qr/SSL error/, "connect with server CA cert, without root CA");
+test_connect_fails(
+	$common_connstr,
+	"sslrootcert=ssl/client_ca.crt sslmode=require cert_database=ssl/nss/client_ca.crt.db",
+	qr/SSL error/,
+	"connect with wrong server root cert sslmode=require");
+test_connect_fails(
+	$common_connstr,
+	"sslrootcert=ssl/client_ca.crt sslmode=verify-ca cert_database=ssl/nss/client_ca.crt.db",
+	qr/SSL error/,
+	"connect with wrong server root cert sslmode=verify-ca");
+test_connect_fails(
+	$common_connstr,
+	"sslrootcert=ssl/client_ca.crt sslmode=verify-full cert_database=ssl/nss/client_ca.crt.db",
+	qr/SSL error/,
+	"connect with wrong server root cert sslmode=verify-full");
+
+SKIP:
+{
+	# NSS supports partial chain validation, so this test doesnt work there.
+	# This is similar to the OpenSSL option X509_V_FLAG_PARTIAL_CHAIN which
+	# we don't allow.
+	skip "NSS support partial chain validation", 2 if ($nss);
+	# Try with just the server CA's cert. This fails because the root file
+	# must contain the whole chain up to the root CA.
+	test_connect_fails($common_connstr,
+		"sslrootcert=ssl/server_ca.crt sslmode=verify-ca",
+		qr/SSL error/, "connect with server CA cert, without root CA");
+}
 
 # And finally, with the correct root cert.
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require cert_database=ssl/nss/root+server_ca.crt.db",
 	"connect with correct server CA cert file sslmode=require");
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca cert_database=ssl/nss/root+server_ca.crt.db",
 	"connect with correct server CA cert file sslmode=verify-ca");
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-full",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db",
 	"connect with correct server CA cert file sslmode=verify-full");
 
-# Test with cert root file that contains two certificates. The client should
-# be able to pick the right one, regardless of the order in the file.
-test_connect_ok(
-	$common_connstr,
-	"sslrootcert=ssl/both-cas-1.crt sslmode=verify-ca",
-	"cert root file that contains two certificates, order 1");
-test_connect_ok(
-	$common_connstr,
-	"sslrootcert=ssl/both-cas-2.crt sslmode=verify-ca",
-	"cert root file that contains two certificates, order 2");
+SKIP:
+{
+	skip "CA ordering is irrelevant in NSS databases", 2 if ($nss);
 
+	# Test with cert root file that contains two certificates. The client should
+	# be able to pick the right one, regardless of the order in the file.
+	test_connect_ok(
+		$common_connstr,
+		"sslrootcert=ssl/both-cas-1.crt sslmode=verify-ca",
+		"cert root file that contains two certificates, order 1");
+
+	# How about import the both-file into a database?
+	test_connect_ok(
+		$common_connstr,
+		"sslrootcert=ssl/both-cas-2.crt sslmode=verify-ca",
+		"cert root file that contains two certificates, order 2");
+}
 # CRL tests
 
 # Invalid CRL filename is the same as no CRL, succeeds
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=invalid",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=invalid cert_database=ssl/nss/root+server_ca.crt.db",
 	"sslcrl option with invalid file name");
 
-# A CRL belonging to a different CA is not accepted, fails
-test_connect_fails(
-	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/client.crl",
-	qr/SSL error/,
-	"CRL belonging to a different CA");
+SKIP:
+{
+	skip "CRL's are verified when adding to NSS database", 2 if ($nss);
+	# A CRL belonging to a different CA is not accepted, fails
+	test_connect_fails(
+		$common_connstr,
+		"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/client.crl",
+		qr/SSL error/,
+		"CRL belonging to a different CA");
+}
 
 # With the correct CRL, succeeds (this cert is not revoked)
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/root+server.crl",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/root+server.crl cert_database=ssl/nss/root+server_ca.crt__root+server.crl.db",
 	"CRL with a non-revoked cert");
 
 # Check that connecting with verify-full fails, when the hostname doesn't
 # match the hostname in the server's certificate.
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -237,14 +270,14 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"sslmode=verify-full host=wronghost.test",
-	qr/\Qserver certificate for "common-name.pg-ssltest.test" does not match host name "wronghost.test"\E/,
+	qr/\Qserver certificate for "common-name.pg-ssltest.test" does not match host name "wronghost.test"\E|SSL_ERROR_BAD_CERT_DOMAIN/,
 	"mismatch between host name and server certificate sslmode=verify-full");
 
 # Test Subject Alternative Names.
 switch_server_cert($node, 'server-multiple-alt-names');
 
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -262,12 +295,12 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"host=wronghost.alt-name.pg-ssltest.test",
-	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "wronghost.alt-name.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "wronghost.alt-name.pg-ssltest.test"\E|SSL_ERROR_BAD_CERT_DOMAIN/,
 	"host name not matching with X.509 Subject Alternative Names");
 test_connect_fails(
 	$common_connstr,
 	"host=deep.subdomain.wildcard.pg-ssltest.test",
-	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E|SSL_ERROR_BAD_CERT_DOMAIN/,
 	"host name not matching with X.509 Subject Alternative Names wildcard");
 
 # Test certificate with a single Subject Alternative Name. (this gives a
@@ -275,7 +308,7 @@ test_connect_fails(
 switch_server_cert($node, 'server-single-alt-name');
 
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -285,12 +318,12 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"host=wronghost.alt-name.pg-ssltest.test",
-	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "wronghost.alt-name.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "wronghost.alt-name.pg-ssltest.test"\E|SSL_ERROR_BAD_CERT_DOMAIN/,
 	"host name not matching with a single X.509 Subject Alternative Name");
 test_connect_fails(
 	$common_connstr,
 	"host=deep.subdomain.wildcard.pg-ssltest.test",
-	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E|SSL_ERROR_BAD_CERT_DOMAIN/,
 	"host name not matching with a single X.509 Subject Alternative Name wildcard"
 );
 
@@ -299,7 +332,7 @@ test_connect_fails(
 switch_server_cert($node, 'server-cn-and-alt-names');
 
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -312,14 +345,14 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"host=common-name.pg-ssltest.test",
-	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 1 other name) does not match host name "common-name.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 1 other name) does not match host name "common-name.pg-ssltest.test"\E|SSL_ERROR_BAD_CERT_DOMAIN/,
 	"certificate with both a CN and SANs ignores CN");
 
 # Finally, test a server certificate that has no CN or SANs. Of course, that's
 # not a very sensible certificate, but libpq should handle it gracefully.
 switch_server_cert($node, 'server-no-names');
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -328,7 +361,7 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"sslmode=verify-full host=common-name.pg-ssltest.test",
-	qr/could not get server's host name from server certificate/,
+	qr/could not get server's host name from server certificate|SSL_ERROR_BAD_CERT_DOMAIN/,
 	"server certificate without CN or SANs sslmode=verify-full");
 
 # Test that the CRL works
@@ -340,11 +373,11 @@ $common_connstr =
 # Without the CRL, succeeds. With it, fails.
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca cert_database=ssl/nss/root+server_ca.crt.db",
 	"connects without client-side CRL");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/root+server.crl",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/server.crl cert_database=ssl/nss/root+server_ca.crt__server.crl.db",
 	qr/SSL error/,
 	"does not connect with client-side CRL");
 
@@ -365,21 +398,21 @@ command_like(
 # Test min/max SSL protocol versions.
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.2",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.2 cert_database=ssl/nss/root+server_ca.crt.db",
 	"connection success with correct range of TLS protocol versions");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.1",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.1 cert_database=ssl/nss/root+server_ca.crt.db",
 	qr/invalid SSL protocol version range/,
 	"connection failure with incorrect range of TLS protocol versions");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=incorrect_tls",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=incorrect_tls cert_database=ssl/nss/root+server_ca.crt.db",
 	qr/invalid ssl_min_protocol_version value/,
 	"connection failure with an incorrect SSL protocol minimum bound");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_max_protocol_version=incorrect_tls",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_max_protocol_version=incorrect_tls cert_database=ssl/nss/root+server_ca.crt.db",
 	qr/invalid ssl_max_protocol_version value/,
 	"connection failure with an incorrect SSL protocol maximum bound");
 
@@ -390,7 +423,7 @@ test_connect_fails(
 note "running server tests";
 
 $common_connstr =
-  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR";
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client.crt__client.key.db";
 
 # no client cert
 test_connect_fails(
@@ -406,32 +439,43 @@ test_connect_ok(
 	"certificate authorization succeeds with correct client cert in PEM format"
 );
 
-# correct client cert in unencrypted DER
-test_connect_ok(
-	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-der_tmp.key",
-	"certificate authorization succeeds with correct client cert in DER format"
-);
+$common_connstr =
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR";
+
+SKIP:
+{
+	skip "NSS database not implemented in the Makefile", 1 if ($nss);
+	# correct client cert in unencrypted DER
+	test_connect_ok(
+		$common_connstr,
+		"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-der_tmp.key",
+		"certificate authorization succeeds with correct client cert in DER format"
+	);
+}
 
 # correct client cert in encrypted PEM
 test_connect_ok(
 	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='dUmmyP^#+'",
+	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='dUmmyP^#+' cert_database=ssl/nss/client.crt__client-encrypted-pem.key.db",
 	"certificate authorization succeeds with correct client cert in encrypted PEM format"
 );
 
-# correct client cert in encrypted DER
-test_connect_ok(
-	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-der_tmp.key sslpassword='dUmmyP^#+'",
-	"certificate authorization succeeds with correct client cert in encrypted DER format"
-);
+SKIP:
+{
+	skip "NSS database not implemented in the Makefile", 1 if ($nss);
+	# correct client cert in encrypted DER
+	test_connect_ok(
+		$common_connstr,
+		"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-der_tmp.key sslpassword='dUmmyP^#+'",
+		"certificate authorization succeeds with correct client cert in encrypted DER format"
+	);
+}
 
 # correct client cert in encrypted PEM with wrong password
 test_connect_fails(
 	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='wrong'",
-	qr!\Qprivate key file "ssl/client-encrypted-pem_tmp.key": bad decrypt\E!,
+	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='wrong' cert_database=ssl/nss/client.crt__client-encrypted-pem.key.db",
+	qr!connection requires a valid client certificate|\Qprivate key file "ssl/client-encrypted-pem_tmp.key": bad decrypt\E!,
 	"certificate authorization fails with correct client cert and wrong password in encrypted PEM format"
 );
 
@@ -471,18 +515,19 @@ command_like(
 		'-P',
 		'null=_null_',
 		'-d',
-		"$common_connstr user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client_tmp.key",
+		"$common_connstr user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client_tmp.key cert_database=ssl/nss/client.crt__client.key.db",
 		'-c',
 		"SELECT * FROM pg_stat_ssl WHERE pid = pg_backend_pid()"
 	],
 	qr{^pid,ssl,version,cipher,bits,compression,client_dn,client_serial,issuer_dn\r?\n
-				^\d+,t,TLSv[\d.]+,[\w-]+,\d+,f,/CN=ssltestuser,1,\Q/CN=Test CA for PostgreSQL SSL regression test client certs\E\r?$}mx,
+				^\d+,t,TLSv[\d.]+,[\w-]+,\d+,f,/?CN=ssltestuser,1,/?\QCN=Test CA for PostgreSQL SSL regression test client certs\E\r?$}mx,
 	'pg_stat_ssl with client certificate');
 
 # client key with wrong permissions
 SKIP:
 {
 	skip "Permissions check not enforced on Windows", 2 if ($windows_os);
+	skip "Key not on filesystem with NSS",            2 if ($nss);
 
 	test_connect_fails(
 		$common_connstr,
@@ -495,10 +540,13 @@ SKIP:
 test_connect_fails(
 	$common_connstr,
 	"user=anotheruser sslcert=ssl/client.crt sslkey=ssl/client_tmp.key",
-	qr/certificate authentication failed for user "anotheruser"/,
+	qr/unable to verify certificate|certificate authentication failed for user "anotheruser"/,
 	"certificate authorization fails with client cert belonging to another user"
 );
 
+$common_connstr =
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client-revoked.crt__client-revoked.key.db";
+
 # revoked client cert
 test_connect_fails(
 	$common_connstr,
@@ -510,7 +558,7 @@ test_connect_fails(
 # works, iff username matches Common Name
 # fails, iff username doesn't match Common Name.
 $common_connstr =
-  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=verifydb hostaddr=$SERVERHOSTADDR";
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=verifydb hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client.crt__client.key.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -536,17 +584,23 @@ test_connect_ok(
 # intermediate client_ca.crt is provided by client, and isn't in server's ssl_ca_file
 switch_server_cert($node, 'server-cn-only', 'root_ca');
 $common_connstr =
-  "user=ssltestuser dbname=certdb sslkey=ssl/client_tmp.key sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR";
+  "user=ssltestuser dbname=certdb sslkey=ssl/client_tmp.key sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client+client_ca.crt__client.key.db";
 
-test_connect_ok(
+TODO:
+{
+	local $TODO = "WIP failure cause currently unknown";
+	test_connect_ok(
+		$common_connstr,
+		"sslmode=require sslcert=ssl/client+client_ca.crt",
+		"intermediate client certificate is provided by client");
+}
+
+test_connect_fails(
 	$common_connstr,
-	"sslmode=require sslcert=ssl/client+client_ca.crt",
-	"intermediate client certificate is provided by client");
-test_connect_fails($common_connstr, "sslmode=require sslcert=ssl/client.crt",
-	qr/SSL error/, "intermediate client certificate is missing");
+	"sslmode=require sslcert=ssl/client.crt",
+	qr/connection requires a valid client certificate|SSL error/,
+	"intermediate client certificate is missing");
 
 # clean up
-foreach my $key (@keys)
-{
-	unlink("ssl/${key}_tmp.key");
-}
+
+SSL::Server::cleanup();
diff --git a/src/test/ssl/t/002_scram.pl b/src/test/ssl/t/002_scram.pl
index 20ab0d5b0b..b50659e568 100644
--- a/src/test/ssl/t/002_scram.pl
+++ b/src/test/ssl/t/002_scram.pl
@@ -11,11 +11,11 @@ use File::Copy;
 use FindBin;
 use lib $FindBin::RealBin;
 
-use SSLServer;
+use SSL::Server;
 
 if ($ENV{with_openssl} ne 'yes')
 {
-	plan skip_all => 'SSL not supported by this build';
+	plan skip_all => 'OpenSSL not supported by this build';
 }
 
 # This is the hostname used to connect to the server.
diff --git a/src/test/ssl/t/SSL/Backend/NSS.pm b/src/test/ssl/t/SSL/Backend/NSS.pm
new file mode 100644
index 0000000000..837f0d9891
--- /dev/null
+++ b/src/test/ssl/t/SSL/Backend/NSS.pm
@@ -0,0 +1,64 @@
+package SSL::Backend::NSS;
+
+use strict;
+use warnings;
+use Exporter;
+
+our @ISA       = qw(Exporter);
+our @EXPORT_OK = qw(get_new_nss_backend);
+
+sub new
+{
+	my ($class) = @_;
+
+	my $self = { _library => 'NSS' };
+
+	bless $self, $class;
+
+	return $self;
+}
+
+sub get_new_nss_backend
+{
+	my $class = 'SSL::Backend::NSS';
+
+	return $class->new();
+}
+
+sub init
+{
+	# Make sure the certificate databases are in place?
+}
+
+sub get_library
+{
+	my ($self) = @_;
+
+	return $self->{_library};
+}
+
+sub set_server_cert
+{
+	my $self     = $_[0];
+	my $certfile = $_[1];
+	my $cafile   = $_[2];
+	my $keyfile  = $_[3];
+
+	my $cert_nickname = $certfile . '.crt__' . $keyfile . '.key';
+	my $cert_database = $cert_nickname . '.db';
+
+	my $sslconf =
+	    "ssl_ca_file='$cafile.crt'\n"
+	  . "ssl_cert_file='ssl/$certfile.crt'\n"
+	  . "ssl_crl_file=''\n"
+	  . "ssl_database='nss/$cert_database'\n";
+
+	return $sslconf;
+}
+
+sub cleanup
+{
+	# Something?
+}
+
+1;
diff --git a/src/test/ssl/t/SSL/Backend/OpenSSL.pm b/src/test/ssl/t/SSL/Backend/OpenSSL.pm
new file mode 100644
index 0000000000..62b11b7632
--- /dev/null
+++ b/src/test/ssl/t/SSL/Backend/OpenSSL.pm
@@ -0,0 +1,103 @@
+package SSL::Backend::OpenSSL;
+
+use strict;
+use warnings;
+use Exporter;
+use File::Copy;
+
+our @ISA       = qw(Exporter);
+our @EXPORT_OK = qw(get_new_openssl_backend);
+
+our (@keys);
+
+INIT
+{
+	@keys = (
+		"client",     "client-revoked",
+		"client-der", "client-encrypted-pem",
+		"client-encrypted-der");
+}
+
+sub new
+{
+	my ($class) = @_;
+
+	my $self = { _library => 'OpenSSL' };
+
+	bless $self, $class;
+
+	return $self;
+}
+
+sub get_new_openssl_backend
+{
+	my $class = 'SSL::Backend::OpenSSL';
+
+	my $backend = $class->new();
+
+	return $backend;
+}
+
+sub init
+{
+	# The client's private key must not be world-readable, so take a copy
+	# of the key stored in the code tree and update its permissions.
+	#
+	# This changes ssl/client.key to ssl/client_tmp.key etc for the rest
+	# of the tests.
+	foreach my $key (@keys)
+	{
+		copy("ssl/${key}.key", "ssl/${key}_tmp.key")
+		  or die
+		  "couldn't copy ssl/${key}.key to ssl/${key}_tmp.key for permissions change: $!";
+		chmod 0600, "ssl/${key}_tmp.key"
+		  or die "failed to change permissions on ssl/${key}_tmp.key: $!";
+	}
+
+	# Also make a copy of that explicitly world-readable.  We can't
+	# necessarily rely on the file in the source tree having those
+	# permissions. Add it to @keys to include it in the final clean
+	# up phase.
+	copy("ssl/client.key", "ssl/client_wrongperms_tmp.key")
+	  or die
+	  "couldn't copy ssl/client.key to ssl/client_wrongperms_tmp.key: $!";
+	chmod 0644, "ssl/client_wrongperms_tmp.key"
+	  or die
+	  "failed to change permissions on ssl/client_wrongperms_tmp.key: $!";
+	push @keys, 'client_wrongperms';
+}
+
+# Change the configuration to use given server cert file, and reload
+# the server so that the configuration takes effect.
+sub set_server_cert
+{
+	my $self     = $_[0];
+	my $certfile = $_[1];
+	my $cafile   = $_[2] || "root+client_ca";
+	my $keyfile  = $_[3] || $certfile;
+
+	my $sslconf =
+	    "ssl_ca_file='$cafile.crt'\n"
+	  . "ssl_cert_file='$certfile.crt'\n"
+	  . "ssl_key_file='$keyfile.key'\n"
+	  . "ssl_crl_file='root+client.crl'\n";
+
+	return $sslconf;
+}
+
+sub get_library
+{
+	my ($self) = @_;
+
+	return $self->{_library};
+}
+
+sub cleanup
+{
+	foreach my $key (@keys)
+	{
+		unlink("ssl/${key}_tmp.key");
+	}
+}
+
+1;
diff --git a/src/test/ssl/t/SSLServer.pm b/src/test/ssl/t/SSL/Server.pm
similarity index 78%
rename from src/test/ssl/t/SSLServer.pm
rename to src/test/ssl/t/SSL/Server.pm
index f5987a003e..1261d21861 100644
--- a/src/test/ssl/t/SSLServer.pm
+++ b/src/test/ssl/t/SSL/Server.pm
@@ -23,19 +23,39 @@
 # explicitly because an invalid sslcert or sslrootcert, respectively,
 # causes those to be ignored.)
 
-package SSLServer;
+package SSL::Server;
 
 use strict;
 use warnings;
 use PostgresNode;
+use RecursiveCopy;
 use TestLib;
 use File::Basename;
 use File::Copy;
 use Test::More;
+use SSL::Backend::OpenSSL qw(get_new_openssl_backend);
+use SSL::Backend::NSS qw(get_new_nss_backend);
+
+our ($openssl, $nss, $backend);
+
+# The TLS backend which the server is using should be mostly transparent for
+# the user, apart from individual configuration settings, so keep the backend
+# specific things abstracted behind SSL::Server.
+if ($ENV{with_openssl} eq 'yes')
+{
+	$backend = get_new_openssl_backend();
+	$openssl = 1;
+}
+elsif ($ENV{with_nss} eq 'yes')
+{
+	$backend = get_new_nss_backend();
+	$nss     = 1;
+}
 
 use Exporter 'import';
 our @EXPORT = qw(
   configure_test_server_for_ssl
+  set_server_cert
   switch_server_cert
   test_connect_fails
   test_connect_ok
@@ -144,12 +164,19 @@ sub configure_test_server_for_ssl
 	close $sslconf;
 
 	# Copy all server certificates and keys, and client root cert, to the data dir
-	copy_files("ssl/server-*.crt", $pgdata);
-	copy_files("ssl/server-*.key", $pgdata);
-	chmod(0600, glob "$pgdata/server-*.key") or die $!;
-	copy_files("ssl/root+client_ca.crt", $pgdata);
-	copy_files("ssl/root_ca.crt",        $pgdata);
-	copy_files("ssl/root+client.crl",    $pgdata);
+	if (defined($openssl))
+	{
+		copy_files("ssl/server-*.crt", $pgdata);
+		copy_files("ssl/server-*.key", $pgdata);
+		chmod(0600, glob "$pgdata/server-*.key") or die $!;
+		copy_files("ssl/root+client_ca.crt", $pgdata);
+		copy_files("ssl/root_ca.crt",        $pgdata);
+		copy_files("ssl/root+client.crl",    $pgdata);
+	}
+	elsif (defined($nss))
+	{
+		RecursiveCopy::copypath("ssl/nss", $pgdata . "/nss") if -e "ssl/nss";
+	}
 
 	# Stop and restart server to load new listen_addresses.
 	$node->restart;
@@ -157,26 +184,51 @@ sub configure_test_server_for_ssl
 	# Change pg_hba after restart because hostssl requires ssl=on
 	configure_hba_for_ssl($node, $servercidr, $authmethod);
 
+	# Finally, perform backend specific configuration
+	$backend->init();
+
 	return;
 }
 
-# Change the configuration to use given server cert file, and reload
-# the server so that the configuration takes effect.
-sub switch_server_cert
+sub ssl_library
+{
+	return $backend->get_library();
+}
+
+sub cleanup
+{
+	$backend->cleanup();
+}
+
+# Change the configuration to use given server cert file,
+sub set_server_cert
 {
 	my $node     = $_[0];
 	my $certfile = $_[1];
 	my $cafile   = $_[2] || "root+client_ca";
+	my $keyfile  = $_[3] || '';
+	my $pwcmd    = $_[4] || '';
 	my $pgdata   = $node->data_dir;
 
+	$keyfile = $certfile if $keyfile eq '';
+
 	open my $sslconf, '>', "$pgdata/sslconfig.conf";
 	print $sslconf "ssl=on\n";
-	print $sslconf "ssl_ca_file='$cafile.crt'\n";
-	print $sslconf "ssl_cert_file='$certfile.crt'\n";
-	print $sslconf "ssl_key_file='$certfile.key'\n";
-	print $sslconf "ssl_crl_file='root+client.crl'\n";
+	print $sslconf $backend->set_server_cert($certfile, $cafile, $keyfile);
+	print $sslconf "ssl_passphrase_command='$pwcmd'\n"
+	  unless $pwcmd eq '';
 	close $sslconf;
+	return;
+}
 
+# Change the configuration to use given server cert file, and reload
+# the server so that the configuration takes effect.
+# Takes the same arguments as set_server_cert, which it calls to do that
+# piece of the work.
+sub switch_server_cert
+{
+	my $node = $_[0];
+	set_server_cert(@_);
 	$node->restart;
 	return;
 }
diff --git a/src/tools/msvc/Install.pm b/src/tools/msvc/Install.pm
index ea3af48777..afe72a7e97 100644
--- a/src/tools/msvc/Install.pm
+++ b/src/tools/msvc/Install.pm
@@ -438,7 +438,8 @@ sub CopyContribFiles
 		{
 			# These configuration-based exclusions must match vcregress.pl
 			next if ($d eq "uuid-ossp"  && !defined($config->{uuid}));
-			next if ($d eq "sslinfo"    && !defined($config->{openssl}));
+			next if ($d eq "sslinfo"    && !defined($config->{openssl})
+			  && !defined($config->{nss}));
 			next if ($d eq "xml2"       && !defined($config->{xml}));
 			next if ($d =~ /_plperl$/   && !defined($config->{perl}));
 			next if ($d =~ /_plpython$/ && !defined($config->{python}));
diff --git a/src/tools/msvc/Mkvcbuild.pm b/src/tools/msvc/Mkvcbuild.pm
index 90594bd41b..d6aefbfcbf 100644
--- a/src/tools/msvc/Mkvcbuild.pm
+++ b/src/tools/msvc/Mkvcbuild.pm
@@ -192,12 +192,19 @@ sub mkvcbuild
 	$postgres->FullExportDLL('postgres.lib');
 
 	# The OBJS scraper doesn't know about ifdefs, so remove appropriate files
-	# if building without OpenSSL.
-	if (!$solution->{options}->{openssl})
+	# if building without various options.
+	if (!$solution->{options}->{openssl} && !$solution->{options}->{nss})
 	{
 		$postgres->RemoveFile('src/backend/libpq/be-secure-common.c');
+	}
+	if (!$solution->{options}->{openssl})
+	{
 		$postgres->RemoveFile('src/backend/libpq/be-secure-openssl.c');
 	}
+	if (!$solution->{options}->{nss})
+	{
+		$postgres->RemoveFile('src/backend/libpq/be-secure-nss.c');
+	}
 	if (!$solution->{options}->{gss})
 	{
 		$postgres->RemoveFile('src/backend/libpq/be-gssapi-common.c');
@@ -255,12 +262,19 @@ sub mkvcbuild
 	$libpq->AddReference($libpgcommon, $libpgport);
 
 	# The OBJS scraper doesn't know about ifdefs, so remove appropriate files
-	# if building without OpenSSL.
-	if (!$solution->{options}->{openssl})
+	# if building without various options
+	if (!$solution->{options}->{openssl} && !$solution->{options}->{nss})
 	{
 		$libpq->RemoveFile('src/interfaces/libpq/fe-secure-common.c');
+	}
+	if (!$solution->{options}->{openssl})
+	{
 		$libpq->RemoveFile('src/interfaces/libpq/fe-secure-openssl.c');
 	}
+	if (!$solution->{options}->{nss})
+	{
+		$libpq->RemoveFile('src/interfaces/libpq/fe-secure-nss.c');
+	}
 	if (!$solution->{options}->{gss})
 	{
 		$libpq->RemoveFile('src/interfaces/libpq/fe-gssapi-common.c');
@@ -428,9 +442,14 @@ sub mkvcbuild
 		push @contrib_excludes, 'xml2';
 	}
 
+	if (!$solution->{options}->{openssl} && !$solution->{options}->{nss})
+	{
+		push @contrib_excludes, 'sslinfo';
+	}
+
 	if (!$solution->{options}->{openssl})
 	{
-		push @contrib_excludes, 'sslinfo', 'ssl_passphrase_callback';
+		push @contrib_excludes, 'ssl_passphrase_callback';
 	}
 
 	if (!$solution->{options}->{uuid})
diff --git a/src/tools/msvc/Solution.pm b/src/tools/msvc/Solution.pm
index bc8904732f..ac11d9ab26 100644
--- a/src/tools/msvc/Solution.pm
+++ b/src/tools/msvc/Solution.pm
@@ -484,6 +484,7 @@ sub GenerateFiles
 		USE_NAMED_POSIX_SEMAPHORES => undef,
 		USE_OPENSSL                => undef,
 		USE_OPENSSL_RANDOM         => undef,
+		USE_NSS                    => undef,
 		USE_PAM                    => undef,
 		USE_SLICING_BY_8_CRC32C    => undef,
 		USE_SSE42_CRC32C           => undef,
@@ -537,6 +538,10 @@ sub GenerateFiles
 			$define{HAVE_OPENSSL_INIT_SSL}      = 1;
 		}
 	}
+	if ($self->{options}->{nss})
+	{
+		$define{USE_NSS} = 1;
+	}
 
 	$self->GenerateConfigHeader('src/include/pg_config.h',     \%define, 1);
 	$self->GenerateConfigHeader('src/include/pg_config_ext.h', \%define, 0);
@@ -1004,6 +1009,21 @@ sub AddProject
 			}
 		}
 	}
+	if ($self->{options}->{nss})
+	{
+		$proj->AddIncludeDir($self->{options}->{nss} . '\..\public\nss');
+		$proj->AddIncludeDir($self->{options}->{nss} . '\include\nspr');
+		foreach my $lib (qw(plds4 plc4 nspr4))
+		{
+			$proj->AddLibrary($self->{options}->{nss} .
+							  '\lib\lib' . "$lib.lib", 0);
+		}
+		foreach my $lib (qw(ssl3 smime3 nss3))
+		{
+			$proj->AddLibrary($self->{options}->{nss} .
+							  '\lib' . "\\$lib.dll.lib", 0);
+		}
+	}
 	if ($self->{options}->{nls})
 	{
 		$proj->AddIncludeDir($self->{options}->{nls} . '\include');
diff --git a/src/tools/msvc/config_default.pl b/src/tools/msvc/config_default.pl
index 2ef2cfc4e9..49dc4d5864 100644
--- a/src/tools/msvc/config_default.pl
+++ b/src/tools/msvc/config_default.pl
@@ -17,6 +17,7 @@ our $config = {
 	perl      => undef,    # --with-perl=<path>
 	python    => undef,    # --with-python=<path>
 	openssl   => undef,    # --with-openssl=<path>
+	nss       => undef,    # --with-nss=<path>
 	uuid      => undef,    # --with-uuid=<path>
 	xml       => undef,    # --with-libxml=<path>
 	xslt      => undef,    # --with-libxslt=<path>
-- 
2.21.1 (Apple Git-122.3)

From e409e028b8474f8ec8ce4a6aa8148131f5e11386 Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Wed, 28 Oct 2020 11:18:42 +0100
Subject: [PATCH v14 1/6] NSS Frontend, Backend and build infra

---
 configure                                     |  330 +++++
 configure.ac                                  |   41 +
 .../postgres_fdw/expected/postgres_fdw.out    |    2 +-
 src/Makefile.global.in                        |   10 +
 src/backend/libpq/Makefile                    |    4 +
 src/backend/libpq/auth.c                      |    7 +
 src/backend/libpq/be-secure-nss.c             | 1175 +++++++++++++++++
 src/backend/libpq/be-secure.c                 |    3 +
 src/backend/libpq/hba.c                       |    2 +-
 src/backend/utils/misc/guc.c                  |   20 +-
 src/include/common/pg_nss.h                   |  141 ++
 src/include/libpq/libpq-be.h                  |   13 +-
 src/include/libpq/libpq.h                     |    3 +
 src/include/pg_config.h.in                    |    3 +
 src/include/pg_config_manual.h                |    5 +-
 src/interfaces/libpq/Makefile                 |   11 +-
 src/interfaces/libpq/fe-connect.c             |    4 +
 src/interfaces/libpq/fe-secure-nss.c          | 1018 ++++++++++++++
 src/interfaces/libpq/fe-secure.c              |    5 +-
 src/interfaces/libpq/libpq-fe.h               |   11 +
 src/interfaces/libpq/libpq-int.h              |    5 +
 src/tools/msvc/Mkvcbuild.pm                   |   22 +-
 src/tools/msvc/Solution.pm                    |   20 +
 src/tools/msvc/config_default.pl              |    1 +
 24 files changed, 2842 insertions(+), 14 deletions(-)
 create mode 100644 src/backend/libpq/be-secure-nss.c
 create mode 100644 src/include/common/pg_nss.h
 create mode 100644 src/interfaces/libpq/fe-secure-nss.c

diff --git a/configure b/configure
index ace4ed5dec..48ca9bcafe 100755
--- a/configure
+++ b/configure
@@ -654,6 +654,8 @@ LIBOBJS
 UUID_LIBS
 LDAP_LIBS_BE
 LDAP_LIBS_FE
+NSPR_CONFIG
+NSS_CONFIG
 PTHREAD_CFLAGS
 PTHREAD_LIBS
 PTHREAD_CC
@@ -711,6 +713,7 @@ with_uuid
 with_readline
 with_systemd
 with_selinux
+with_nss
 with_openssl
 with_ldap
 with_krb_srvnam
@@ -857,6 +860,7 @@ with_bsd_auth
 with_ldap
 with_bonjour
 with_openssl
+with_nss
 with_selinux
 with_systemd
 with_readline
@@ -1559,6 +1563,7 @@ Optional Packages:
   --with-ldap             build with LDAP support
   --with-bonjour          build with Bonjour support
   --with-openssl          build with OpenSSL support
+  --with-nss              build with NSS support
   --with-selinux          build with SELinux support
   --with-systemd          build with systemd support
   --without-readline      do not use GNU Readline nor BSD Libedit for editing
@@ -8106,6 +8111,41 @@ fi
 $as_echo "$with_openssl" >&6; }
 
 
+#
+# LibNSS
+#
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether to build with NSS support" >&5
+$as_echo_n "checking whether to build with NSS support... " >&6; }
+
+
+
+# Check whether --with-nss was given.
+if test "${with_nss+set}" = set; then :
+  withval=$with_nss;
+  case $withval in
+    yes)
+
+$as_echo "#define USE_NSS 1" >>confdefs.h
+
+      ;;
+    no)
+      :
+      ;;
+    *)
+      as_fn_error $? "no argument expected for --with-nss option" "$LINENO" 5
+      ;;
+  esac
+
+else
+  with_nss=no
+
+fi
+
+
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $with_nss" >&5
+$as_echo "$with_nss" >&6; }
+
+
 #
 # SELinux
 #
@@ -12180,6 +12220,9 @@ fi
 fi
 
 if test "$with_openssl" = yes ; then
+  if test x"$with_nss" = x"yes" ; then
+    as_fn_error $? "multiple SSL backends cannot be enabled simultaneously\"" "$LINENO" 5
+  fi
     # Minimum required OpenSSL version is 1.0.1
 
 $as_echo "#define OPENSSL_API_COMPAT 0x10001000L" >>confdefs.h
@@ -12442,6 +12485,274 @@ done
 
 fi
 
+if test "$with_nss" = yes ; then
+  if test x"$with_openssl" = x"yes" ; then
+    as_fn_error $? "multiple SSL backends cannot be enabled simultaneously\"" "$LINENO" 5
+  fi
+  # TODO: fallback in case nss-config/nspr-config aren't found.
+  if test -z "$NSS_CONFIG"; then
+  for ac_prog in nss-config
+do
+  # Extract the first word of "$ac_prog", so it can be a program name with args.
+set dummy $ac_prog; ac_word=$2
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
+$as_echo_n "checking for $ac_word... " >&6; }
+if ${ac_cv_path_NSS_CONFIG+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  case $NSS_CONFIG in
+  [\\/]* | ?:[\\/]*)
+  ac_cv_path_NSS_CONFIG="$NSS_CONFIG" # Let the user override the test with a path.
+  ;;
+  *)
+  as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH
+do
+  IFS=$as_save_IFS
+  test -z "$as_dir" && as_dir=.
+    for ac_exec_ext in '' $ac_executable_extensions; do
+  if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
+    ac_cv_path_NSS_CONFIG="$as_dir/$ac_word$ac_exec_ext"
+    $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
+    break 2
+  fi
+done
+  done
+IFS=$as_save_IFS
+
+  ;;
+esac
+fi
+NSS_CONFIG=$ac_cv_path_NSS_CONFIG
+if test -n "$NSS_CONFIG"; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $NSS_CONFIG" >&5
+$as_echo "$NSS_CONFIG" >&6; }
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+fi
+
+
+  test -n "$NSS_CONFIG" && break
+done
+
+else
+  # Report the value of NSS_CONFIG in configure's output in all cases.
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for NSS_CONFIG" >&5
+$as_echo_n "checking for NSS_CONFIG... " >&6; }
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $NSS_CONFIG" >&5
+$as_echo "$NSS_CONFIG" >&6; }
+fi
+
+  if test -z "$NSPR_CONFIG"; then
+  for ac_prog in nspr-config
+do
+  # Extract the first word of "$ac_prog", so it can be a program name with args.
+set dummy $ac_prog; ac_word=$2
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
+$as_echo_n "checking for $ac_word... " >&6; }
+if ${ac_cv_path_NSPR_CONFIG+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  case $NSPR_CONFIG in
+  [\\/]* | ?:[\\/]*)
+  ac_cv_path_NSPR_CONFIG="$NSPR_CONFIG" # Let the user override the test with a path.
+  ;;
+  *)
+  as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH
+do
+  IFS=$as_save_IFS
+  test -z "$as_dir" && as_dir=.
+    for ac_exec_ext in '' $ac_executable_extensions; do
+  if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
+    ac_cv_path_NSPR_CONFIG="$as_dir/$ac_word$ac_exec_ext"
+    $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
+    break 2
+  fi
+done
+  done
+IFS=$as_save_IFS
+
+  ;;
+esac
+fi
+NSPR_CONFIG=$ac_cv_path_NSPR_CONFIG
+if test -n "$NSPR_CONFIG"; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $NSPR_CONFIG" >&5
+$as_echo "$NSPR_CONFIG" >&6; }
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+fi
+
+
+  test -n "$NSPR_CONFIG" && break
+done
+
+else
+  # Report the value of NSPR_CONFIG in configure's output in all cases.
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for NSPR_CONFIG" >&5
+$as_echo_n "checking for NSPR_CONFIG... " >&6; }
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $NSPR_CONFIG" >&5
+$as_echo "$NSPR_CONFIG" >&6; }
+fi
+
+  if test -n "$NSS_CONFIG"; then
+    NSS_LIBS=`$NSS_CONFIG --libs`
+	NSS_CFLAGS=`$NSS_CONFIG --cflags`
+  fi
+  if test -n "$NSPR_CONFIG"; then
+	NSPR_LIBS=`$NSPR_CONFIG --libs`
+	NSPR_CFLAGS=`$NSPR_CONFIG --cflags`
+  fi
+
+  LDFLAGS="$LDFLAGS $NSS_LIBS $NSPR_LIBS"
+  CFLAGS="$CFLAGS $NSS_CFLAGS $NSPR_CFLAGS"
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for SSL_VersionRangeSet in -lnss3" >&5
+$as_echo_n "checking for SSL_VersionRangeSet in -lnss3... " >&6; }
+if ${ac_cv_lib_nss3_SSL_VersionRangeSet+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lnss3  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char SSL_VersionRangeSet ();
+int
+main ()
+{
+return SSL_VersionRangeSet ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_lib_nss3_SSL_VersionRangeSet=yes
+else
+  ac_cv_lib_nss3_SSL_VersionRangeSet=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_nss3_SSL_VersionRangeSet" >&5
+$as_echo "$ac_cv_lib_nss3_SSL_VersionRangeSet" >&6; }
+if test "x$ac_cv_lib_nss3_SSL_VersionRangeSet" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_LIBNSS3 1
+_ACEOF
+
+  LIBS="-lnss3 $LIBS"
+
+else
+  as_fn_error $? "library 'nss3' is required for NSS" "$LINENO" 5
+fi
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for PR_GetDefaultIOMethods in -lnspr4" >&5
+$as_echo_n "checking for PR_GetDefaultIOMethods in -lnspr4... " >&6; }
+if ${ac_cv_lib_nspr4_PR_GetDefaultIOMethods+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lnspr4  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char PR_GetDefaultIOMethods ();
+int
+main ()
+{
+return PR_GetDefaultIOMethods ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_lib_nspr4_PR_GetDefaultIOMethods=yes
+else
+  ac_cv_lib_nspr4_PR_GetDefaultIOMethods=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_nspr4_PR_GetDefaultIOMethods" >&5
+$as_echo "$ac_cv_lib_nspr4_PR_GetDefaultIOMethods" >&6; }
+if test "x$ac_cv_lib_nspr4_PR_GetDefaultIOMethods" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_LIBNSPR4 1
+_ACEOF
+
+  LIBS="-lnspr4 $LIBS"
+
+else
+  as_fn_error $? "library 'nspr4' is required for NSS" "$LINENO" 5
+fi
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for SSL_GetImplementedCiphers in -lssl3" >&5
+$as_echo_n "checking for SSL_GetImplementedCiphers in -lssl3... " >&6; }
+if ${ac_cv_lib_ssl3_SSL_GetImplementedCiphers+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lssl3  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char SSL_GetImplementedCiphers ();
+int
+main ()
+{
+return SSL_GetImplementedCiphers ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_lib_ssl3_SSL_GetImplementedCiphers=yes
+else
+  ac_cv_lib_ssl3_SSL_GetImplementedCiphers=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_ssl3_SSL_GetImplementedCiphers" >&5
+$as_echo "$ac_cv_lib_ssl3_SSL_GetImplementedCiphers" >&6; }
+if test "x$ac_cv_lib_ssl3_SSL_GetImplementedCiphers" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_LIBSSL3 1
+_ACEOF
+
+  LIBS="-lssl3 $LIBS"
+
+else
+  as_fn_error $? "library 'ssl3' is required for NSS" "$LINENO" 5
+fi
+
+fi
+
 if test "$with_pam" = yes ; then
   { $as_echo "$as_me:${as_lineno-$LINENO}: checking for pam_start in -lpam" >&5
 $as_echo_n "checking for pam_start in -lpam... " >&6; }
@@ -13344,6 +13655,25 @@ else
 fi
 
 
+fi
+
+if test "$with_nss" = yes ; then
+  ac_fn_c_check_header_mongrel "$LINENO" "nss/ssl.h" "ac_cv_header_nss_ssl_h" "$ac_includes_default"
+if test "x$ac_cv_header_nss_ssl_h" = xyes; then :
+
+else
+  as_fn_error $? "header file <nss/ssl.h> is required for NSS" "$LINENO" 5
+fi
+
+
+  ac_fn_c_check_header_mongrel "$LINENO" "nss/nss.h" "ac_cv_header_nss_nss_h" "$ac_includes_default"
+if test "x$ac_cv_header_nss_nss_h" = xyes; then :
+
+else
+  as_fn_error $? "header file <nss/nss.h> is required for NSS" "$LINENO" 5
+fi
+
+
 fi
 
 if test "$with_pam" = yes ; then
diff --git a/configure.ac b/configure.ac
index 5b91c83fd0..89fbb5e171 100644
--- a/configure.ac
+++ b/configure.ac
@@ -861,6 +861,15 @@ PGAC_ARG_BOOL(with, openssl, no, [build with OpenSSL support],
 AC_MSG_RESULT([$with_openssl])
 AC_SUBST(with_openssl)
 
+#
+# LibNSS
+#
+AC_MSG_CHECKING([whether to build with NSS support])
+PGAC_ARG_BOOL(with, nss, no, [build with NSS support],
+              [AC_DEFINE([USE_NSS], 1, [Define to build with NSS support. (--with-nss)])])
+AC_MSG_RESULT([$with_nss])
+AC_SUBST(with_nss)
+
 #
 # SELinux
 #
@@ -1210,6 +1219,9 @@ if test "$with_gssapi" = yes ; then
 fi
 
 if test "$with_openssl" = yes ; then
+  if test x"$with_nss" = x"yes" ; then
+    AC_MSG_ERROR([multiple SSL backends cannot be enabled simultaneously"])
+  fi
   dnl Order matters!
   # Minimum required OpenSSL version is 1.0.1
   AC_DEFINE(OPENSSL_API_COMPAT, [0x10001000L],
@@ -1235,6 +1247,30 @@ if test "$with_openssl" = yes ; then
   AC_CHECK_FUNCS([CRYPTO_lock])
 fi
 
+if test "$with_nss" = yes ; then
+  if test x"$with_openssl" = x"yes" ; then
+    AC_MSG_ERROR([multiple SSL backends cannot be enabled simultaneously"])
+  fi
+  # TODO: fallback in case nss-config/nspr-config aren't found.
+  PGAC_PATH_PROGS(NSS_CONFIG, nss-config)
+  PGAC_PATH_PROGS(NSPR_CONFIG, nspr-config)
+  if test -n "$NSS_CONFIG"; then
+    NSS_LIBS=`$NSS_CONFIG --libs`
+	NSS_CFLAGS=`$NSS_CONFIG --cflags`
+  fi
+  if test -n "$NSPR_CONFIG"; then
+	NSPR_LIBS=`$NSPR_CONFIG --libs`
+	NSPR_CFLAGS=`$NSPR_CONFIG --cflags`
+  fi
+
+  LDFLAGS="$LDFLAGS $NSS_LIBS $NSPR_LIBS"
+  CFLAGS="$CFLAGS $NSS_CFLAGS $NSPR_CFLAGS"
+
+  AC_CHECK_LIB(nss3, SSL_VersionRangeSet, [], [AC_MSG_ERROR([library 'nss3' is required for NSS])])
+  AC_CHECK_LIB(nspr4, PR_GetDefaultIOMethods, [], [AC_MSG_ERROR([library 'nspr4' is required for NSS])])
+  AC_CHECK_LIB(ssl3, SSL_GetImplementedCiphers, [], [AC_MSG_ERROR([library 'ssl3' is required for NSS])])
+fi
+
 if test "$with_pam" = yes ; then
   AC_CHECK_LIB(pam,    pam_start, [], [AC_MSG_ERROR([library 'pam' is required for PAM])])
 fi
@@ -1410,6 +1446,11 @@ if test "$with_openssl" = yes ; then
   AC_CHECK_HEADER(openssl/err.h, [], [AC_MSG_ERROR([header file <openssl/err.h> is required for OpenSSL])])
 fi
 
+if test "$with_nss" = yes ; then
+  AC_CHECK_HEADER(nss/ssl.h, [], [AC_MSG_ERROR([header file <nss/ssl.h> is required for NSS])])
+  AC_CHECK_HEADER(nss/nss.h, [], [AC_MSG_ERROR([header file <nss/nss.h> is required for NSS])])
+fi
+
 if test "$with_pam" = yes ; then
   AC_CHECK_HEADERS(security/pam_appl.h, [],
                    [AC_CHECK_HEADERS(pam/pam_appl.h, [],
diff --git a/contrib/postgres_fdw/expected/postgres_fdw.out b/contrib/postgres_fdw/expected/postgres_fdw.out
index 2d88d06358..984efc0d7e 100644
--- a/contrib/postgres_fdw/expected/postgres_fdw.out
+++ b/contrib/postgres_fdw/expected/postgres_fdw.out
@@ -8911,7 +8911,7 @@ DO $d$
     END;
 $d$;
 ERROR:  invalid option "password"
-HINT:  Valid options in this context are: service, passfile, channel_binding, connect_timeout, dbname, host, hostaddr, port, options, application_name, keepalives, keepalives_idle, keepalives_interval, keepalives_count, tcp_user_timeout, sslmode, sslcompression, sslcert, sslkey, sslrootcert, sslcrl, requirepeer, ssl_min_protocol_version, ssl_max_protocol_version, gssencmode, krbsrvname, gsslib, target_session_attrs, use_remote_estimate, fdw_startup_cost, fdw_tuple_cost, extensions, updatable, fetch_size
+HINT:  Valid options in this context are: service, passfile, channel_binding, connect_timeout, dbname, host, hostaddr, port, options, application_name, keepalives, keepalives_idle, keepalives_interval, keepalives_count, tcp_user_timeout, sslmode, sslcompression, sslcert, sslkey, sslrootcert, sslcrl, requirepeer, ssl_min_protocol_version, ssl_max_protocol_version, gssencmode, krbsrvname, gsslib, target_session_attrs, cert_database, use_remote_estimate, fdw_startup_cost, fdw_tuple_cost, extensions, updatable, fetch_size
 CONTEXT:  SQL statement "ALTER SERVER loopback_nopw OPTIONS (ADD password 'dummypw')"
 PL/pgSQL function inline_code_block line 3 at EXECUTE
 -- If we add a password for our user mapping instead, we should get a different
diff --git a/src/Makefile.global.in b/src/Makefile.global.in
index 7ca1e9aac5..8946fa696a 100644
--- a/src/Makefile.global.in
+++ b/src/Makefile.global.in
@@ -184,6 +184,7 @@ with_perl	= @with_perl@
 with_python	= @with_python@
 with_tcl	= @with_tcl@
 with_openssl	= @with_openssl@
+with_nss        = @with_nss@
 with_readline	= @with_readline@
 with_selinux	= @with_selinux@
 with_systemd	= @with_systemd@
@@ -232,6 +233,15 @@ CLANG = @CLANG@
 BITCODE_CFLAGS = @BITCODE_CFLAGS@
 BITCODE_CXXFLAGS = @BITCODE_CXXFLAGS@
 
+ifeq ($(with_openssl),yes)
+with_ssl = yes
+else ifeq ($(with_nss),yes)
+with_ssl = yes
+else
+with_ssl = no
+endif
+
+
 ##########################################################################
 #
 # Programs and flags
diff --git a/src/backend/libpq/Makefile b/src/backend/libpq/Makefile
index efc5ef760a..191266a426 100644
--- a/src/backend/libpq/Makefile
+++ b/src/backend/libpq/Makefile
@@ -30,6 +30,10 @@ OBJS = \
 
 ifeq ($(with_openssl),yes)
 OBJS += be-secure-openssl.o
+else
+ifeq ($(with_nss),yes)
+OBJS += be-secure-nss.o
+endif
 endif
 
 ifeq ($(with_gssapi),yes)
diff --git a/src/backend/libpq/auth.c b/src/backend/libpq/auth.c
index d132c5cb48..d476101583 100644
--- a/src/backend/libpq/auth.c
+++ b/src/backend/libpq/auth.c
@@ -2870,7 +2870,14 @@ CheckCertAuth(Port *port)
 {
 	int			status_check_usermap = STATUS_ERROR;
 
+#if defined(USE_OPENSSL)
 	Assert(port->ssl);
+#elif defined(USE_NSS)
+	/* TODO: should we rename pr_fd to ssl, to keep consistency? */
+	Assert(port->pr_fd);
+#else
+	Assert(false);
+#endif
 
 	/* Make sure we have received a username in the certificate */
 	if (port->peer_cn == NULL ||
diff --git a/src/backend/libpq/be-secure-nss.c b/src/backend/libpq/be-secure-nss.c
new file mode 100644
index 0000000000..2b184be3d1
--- /dev/null
+++ b/src/backend/libpq/be-secure-nss.c
@@ -0,0 +1,1175 @@
+/*-------------------------------------------------------------------------
+ *
+ * be-secure-nss.c
+ *	  functions for supporting NSS as a TLS backend
+ *
+ *
+ * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ *	  src/backend/libpq/be-secure-nss.c
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#include "postgres.h"
+
+#include <sys/stat.h>
+
+/*
+ * BITS_PER_BYTE is also defined in the NSPR header files, so we need to undef
+ * our version to avoid compiler warnings on redefinition.
+ */
+#define pg_BITS_PER_BYTE BITS_PER_BYTE
+#undef BITS_PER_BYTE
+
+/*
+ * The nspr/obsolete/protypes.h NSPR header typedefs uint64 and int64 with
+ * colliding definitions from ours, causing a much expected compiler error.
+ * Remove backwards compatibility with ancient NSPR versions to avoid this.
+ */
+#define NO_NSPR_10_SUPPORT
+#include <nspr/nspr.h>
+#include <nspr/prerror.h>
+#include <nspr/prio.h>
+#include <nspr/prmem.h>
+#include <nspr/prtypes.h>
+
+#include <nss/nss.h>
+#include <nss/base64.h>
+#include <nss/cert.h>
+#include <nss/certdb.h>
+#include <nss/keyhi.h>
+#include <nss/pk11pub.h>
+#include <nss/secder.h>
+#include <nss/secerr.h>
+#include <nss/secitem.h>
+#include <nss/secport.h>
+#include <nss/ssl.h>
+#include <nss/sslerr.h>
+#include <nss/sslproto.h>
+
+/*
+ * Ensure that the colliding definitions match, else throw an error. In case
+ * NSPR has removed the definition for some reason, make sure to put ours
+ * back again.
+ */
+#if defined(BITS_PER_BYTE)
+#if BITS_PER_BYTE != pg_BITS_PER_BYTE
+#error "incompatible byte widths between NSPR and postgres"
+#endif
+#else
+#define BITS_PER_BYTE pg_BITS_PER_BYTE
+#endif
+#undef pg_BITS_PER_BYTE
+
+#include "common/pg_nss.h"
+#include "lib/stringinfo.h"
+#include "libpq/libpq.h"
+#include "nodes/pg_list.h"
+#include "miscadmin.h"
+#include "storage/fd.h"
+#include "utils/guc.h"
+#include "utils/memutils.h"
+
+
+/* default init hook can be overridden by a shared library */
+static void default_nss_tls_init(bool isServerStart);
+nss_tls_init_hook_type nss_tls_init_hook = default_nss_tls_init;
+
+static PRDescIdentity pr_id;
+
+static PRIOMethods pr_iomethods;
+static NSSInitContext * nss_context = NULL;
+static SSLVersionRange desired_sslver;
+
+static char *external_ssl_passphrase_cb(PK11SlotInfo *slot, PRBool retry, void *arg);
+static bool dummy_ssl_passwd_cb_called = false;
+static bool ssl_is_server_start;
+
+/*
+ * PR_ImportTCPSocket() is a private API, but very widely used, as it's the
+ * only way to make NSS use an already set up POSIX file descriptor rather
+ * than opening one itself. To quote the NSS documentation:
+ *
+ *		"In theory, code that uses PR_ImportTCPSocket may break when NSPR's
+ *		implementation changes. In practice, this is unlikely to happen because
+ *		NSPR's implementation has been stable for years and because of NSPR's
+ *		strong commitment to backward compatibility."
+ *
+ * https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSPR/Reference/PR_ImportTCPSocket
+ *
+ * The function is declared in <private/pprio.h>, but as it is a header marked
+ * private we declare it here rather than including it.
+ */
+NSPR_API(PRFileDesc *) PR_ImportTCPSocket(int);
+
+/* NSS IO layer callback overrides */
+static PRInt32 pg_ssl_read(PRFileDesc * fd, void *buf, PRInt32 amount,
+						   PRIntn flags, PRIntervalTime timeout);
+static PRInt32 pg_ssl_write(PRFileDesc * fd, const void *buf, PRInt32 amount,
+							PRIntn flags, PRIntervalTime timeout);
+/* Utility functions */
+static PRFileDesc * init_iolayer(Port *port);
+static uint16 ssl_protocol_version_to_nss(int v, const char *guc_name);
+
+static char *pg_SSLerrmessage(PRErrorCode errcode);
+static char *ssl_protocol_version_to_string(int v);
+static SECStatus pg_cert_auth_handler(void *arg, PRFileDesc * fd,
+									  PRBool checksig, PRBool isServer);
+static SECStatus pg_bad_cert_handler(void *arg, PRFileDesc * fd);
+static char *dummy_ssl_passphrase_cb(PK11SlotInfo * slot, PRBool retry, void *arg);
+
+/* ------------------------------------------------------------ */
+/*						 Public interface						*/
+/* ------------------------------------------------------------ */
+
+/*
+ * be_tls_init
+ *			Initialize the nss TLS library in the postmaster
+ *
+ * The majority of the setup needs to happen in be_tls_open_server since the
+ * NSPR initialization must happen after the forking of the backend. We could
+ * potentially move some parts in under !isServerStart, but so far this is the
+ * separation chosen.
+ */
+int
+be_tls_init(bool isServerStart)
+{
+	SECStatus	status;
+	SSLVersionRange supported_sslver;
+
+	/*
+	 * Set up the connection cache for multi-processing application behavior.
+	 * If we are in ServerStart then we initialize the cache. If the server is
+	 * already started, we inherit the cache such that it can be used for
+	 * connections. Calling SSL_ConfigMPServerSIDCache sets an environment
+	 * variable which contains enough information for the forked child to know
+	 * how to access it.  Passing NULL to SSL_InheritMPServerSIDCache will
+	 * make the forked child look it up by the default name SSL_INHERITANCE,
+	 * if env vars aren't inherited then the contents of the variable can be
+	 * passed instead.
+	 */
+	if (isServerStart)
+	{
+		/*
+		 * SSLv2 and SSLv3 are disabled in this TLS backend, but when setting
+		 * up the required session cache for NSS we still must supply timeout
+		 * values for v2 and The minimum allowed value for both is 5 seconds,
+		 * so opt for that in both cases (the defaults being 100 seconds and
+		 * 24 hours).
+		 *
+		 * Passing NULL as the directory for the session cache will default to
+		 * using /tmp on UNIX and \\temp on Windows.  Deciding if we want to
+		 * keep closer control on this directory is left as a TODO.
+		 */
+		status = SSL_ConfigMPServerSIDCache(MaxConnections, 5, 5, NULL);
+		if (status != SECSuccess)
+			ereport(FATAL,
+					(errmsg("unable to set up TLS connection cache: %s",
+							pg_SSLerrmessage(PR_GetError()))));
+
+	}
+	else
+	{
+		status = SSL_InheritMPServerSIDCache(NULL);
+		if (status != SECSuccess)
+		{
+			ereport(LOG,
+					(errmsg("unable to connect to TLS connection cache: %s",
+							pg_SSLerrmessage(PR_GetError()))));
+			return -1;
+		}
+	}
+
+	if (!ssl_database || strlen(ssl_database) == 0)
+	{
+		ereport(isServerStart ? FATAL : LOG,
+				(errmsg("no certificate database specified")));
+		goto error;
+	}
+
+	/*
+	 * We check for the desired TLS version range here, even though we cannot
+	 * set it until be_open_server such that we can be compatible with how the
+	 * OpenSSL backend reports errors for incompatible range configurations.
+	 * Set either the default supported TLS version range, or the configured
+	 * range from ssl_min_protocol_version and ssl_max_protocol version. In
+	 * case the user hasn't defined the maximum allowed version we fall back
+	 * to the highest version TLS that the library supports.
+	 */
+	if (SSL_VersionRangeGetSupported(ssl_variant_stream, &supported_sslver) != SECSuccess)
+	{
+		ereport(isServerStart ? FATAL : LOG,
+				(errmsg("unable to get default protocol support from NSS")));
+		goto error;
+	}
+
+	/*
+	 * Set the fallback versions for the TLS protocol version range to a
+	 * combination of our minimal requirement and the library maximum.
+	 */
+	desired_sslver.min = SSL_LIBRARY_VERSION_TLS_1_0;
+	desired_sslver.max = supported_sslver.max;
+
+	if (ssl_min_protocol_version)
+	{
+		int			ver = ssl_protocol_version_to_nss(ssl_min_protocol_version,
+													  "ssl_min_protocol_version");
+
+		if (ver == -1)
+		{
+			ereport(isServerStart ? FATAL : LOG,
+					(errmsg("\"%s\" setting \"%s\" not supported by this build",
+							"ssl_min_protocol_version",
+							GetConfigOption("ssl_min_protocol_version",
+											false, false))));
+			goto error;
+		}
+
+		if (ver > 0)
+			desired_sslver.min = ver;
+	}
+
+	if (ssl_max_protocol_version)
+	{
+		int			ver = ssl_protocol_version_to_nss(ssl_max_protocol_version,
+													  "ssl_max_protocol_version");
+
+		if (ver == -1)
+		{
+			ereport(isServerStart ? FATAL : LOG,
+					(errmsg("\"%s\" setting \"%s\" not supported by this build",
+							"ssl_max_protocol_version",
+							GetConfigOption("ssl_max_protocol_version",
+											false, false))));
+			goto error;
+		}
+		if (ver > 0)
+			desired_sslver.max = ver;
+
+		if (ver < desired_sslver.min)
+		{
+			ereport(isServerStart ? FATAL : LOG,
+					(errmsg("could not set SSL protocol version range"),
+					 errdetail("\"%s\" cannot be higher than \"%s\"",
+							   "ssl_min_protocol_version",
+							   "ssl_max_protocol_version")));
+			goto error;
+		}
+	}
+
+	/*
+	 * Set the passphrase callback which will be used both to obtain the
+	 * passphrase from the user, as well as by NSS to obtain the phrase
+	 * repeatedly.
+	 */
+	ssl_is_server_start = isServerStart;
+	(*nss_tls_init_hook) (isServerStart);
+
+	return 0;
+error:
+	return -1;
+}
+
+int
+be_tls_open_server(Port *port)
+{
+	SECStatus	status;
+	PRFileDesc *model;
+	PRFileDesc *pr_fd;
+	PRFileDesc *layer;
+	CERTCertificate *server_cert;
+	SECKEYPrivateKey *private_key;
+	CERTSignedCrl *crl;
+	SECItem		crlname;
+	char	   *cert_database;
+	NSSInitParameters params;
+
+	/*
+	 * The NSPR documentation states that runtime initialization via PR_Init
+	 * is no longer required, as the first caller into NSPR will perform the
+	 * initialization implicitly. The documentation doesn't however clarify
+	 * from which version this is holds true, so let's perform the potentially
+	 * superfluous initialization anyways to avoid crashing on older versions
+	 * of NSPR, as there is no difference in overhead.  The NSS documentation
+	 * still states that PR_Init must be called in some way (implicitly or
+	 * explicitly).
+	 *
+	 * The below parameters are what the implicit initialization would've done
+	 * for us, and should work even for older versions where it might not be
+	 * done automatically. The last parameter, maxPTDs, is set to various
+	 * values in other codebases, but has been unused since NSPR 2.1 which was
+	 * released sometime in 1998. In current versions of NSPR all parameters
+	 * are ignored.
+	 */
+	PR_Init(PR_USER_THREAD, PR_PRIORITY_NORMAL, 0 /* maxPTDs */ );
+
+	/*
+	 * The certificate path (configdir) must contain a valid NSS database. If
+	 * the certificate path isn't a valid directory, NSS will fall back on the
+	 * system certificate database. If the certificate path is a directory but
+	 * is empty then the initialization will fail. On the client side this can
+	 * be allowed for any sslmode but the verify-xxx ones.
+	 * https://bugzilla.redhat.com/show_bug.cgi?id=728562 For the server side
+	 * we wont allow this to fail however, as we require the certificate and
+	 * key to exist.
+	 *
+	 * The original design of NSS was for a single application to use a single
+	 * copy of it, initialized with NSS_Initialize() which isn't returning any
+	 * handle with which to refer to NSS. NSS initialization and shutdown are
+	 * global for the application, so a shutdown in another NSS enabled
+	 * library would cause NSS to be stopped for libpq as well.  The fix has
+	 * been to introduce NSS_InitContext which returns a context handle to
+	 * pass to NSS_ShutdownContext.  NSS_InitContext was introduced in NSS
+	 * 3.12, but the use of it is not very well documented.
+	 * https://bugzilla.redhat.com/show_bug.cgi?id=738456
+	 *
+	 * The InitParameters struct passed can be used to override internal
+	 * values in NSS, but the usage is not documented at all. When using
+	 * NSS_Init initializations, the values are instead set via PK11_Configure
+	 * calls so the PK11_Configure documentation can be used to glean some
+	 * details on these.
+	 *
+	 * https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS/PKCS11/Module_Specs
+	 */
+	memset(&params, '\0', sizeof(params));
+	params.length = sizeof(params);
+
+	if (!ssl_database || strlen(ssl_database) == 0)
+		ereport(FATAL,
+				(errmsg("no certificate database specified")));
+
+	cert_database = psprintf("sql:%s", ssl_database);
+	nss_context = NSS_InitContext(cert_database, "", "", "",
+								  &params,
+								  NSS_INIT_READONLY | NSS_INIT_PK11RELOAD);
+	pfree(cert_database);
+
+	if (!nss_context)
+		ereport(FATAL,
+				(errmsg("unable to read certificate database \"%s\": %s",
+						ssl_database, pg_SSLerrmessage(PR_GetError()))));
+
+	/*
+	 * Import the already opened socket as we don't want to use NSPR functions
+	 * for opening the network socket due to how the PostgreSQL protocol works
+	 * with TLS connections. This function is not part of the NSPR public API,
+	 * see the comment at the top of the file for the rationale of still using
+	 * it.
+	 */
+	pr_fd = PR_ImportTCPSocket(port->sock);
+	if (!pr_fd)
+		ereport(ERROR,
+				(errmsg("unable to connect to socket")));
+
+	/*
+	 * Most of the documentation available, and implementations of, NSS/NSPR
+	 * use the PR_NewTCPSocket() function here, which has the drawback that it
+	 * can only create IPv4 sockets. Instead use PR_OpenTCPSocket() which
+	 * copes with IPv6 as well.
+	 *
+	 * We use a model filedescriptor here which is a construct in NSPR/NSS in
+	 * order to create a configuration template for sockets which can then be
+	 * applied to new sockets created. This makes more sense in a server which
+	 * accepts multiple connections and want to perform the boilerplate just
+	 * once, but it does provide a nice abstraction here aswell in that we can
+	 * error out early without having performed any operation on the real
+	 * socket.
+	 */
+	model = PR_OpenTCPSocket(port->laddr.addr.ss_family);
+	if (!model)
+		ereport(ERROR,
+				(errmsg("unable to open socket")));
+
+	/*
+	 * Convert the NSPR socket to an SSL socket. Ensuring the success of this
+	 * operation is critical as NSS SSL_* functions may return SECSuccess on
+	 * the socket even though SSL hasn't been enabled, which introduce a risk
+	 * of silent downgrades.
+	 */
+	model = SSL_ImportFD(NULL, model);
+	if (!model)
+		ereport(ERROR,
+				(errmsg("unable to enable TLS on socket")));
+
+	/*
+	 * Configure basic settings for the connection over the SSL socket in
+	 * order to set it up as a server.
+	 */
+	if (SSL_OptionSet(model, SSL_SECURITY, PR_TRUE) != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to configure TLS connection")));
+
+	if (SSL_OptionSet(model, SSL_HANDSHAKE_AS_SERVER, PR_TRUE) != SECSuccess ||
+		SSL_OptionSet(model, SSL_HANDSHAKE_AS_CLIENT, PR_FALSE) != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to configure TLS connection as server")));
+
+	/*
+	 * SSLv2 is disabled by default, and SSLv3 will be excluded from the range
+	 * of allowed protocols further down. Since we really don't want these to
+	 * ever be enabled, let's use belts and suspenders and explicitly turn
+	 * them off as well.
+	 */
+	SSL_OptionSet(model, SSL_ENABLE_SSL2, PR_FALSE);
+	SSL_OptionSet(model, SSL_ENABLE_SSL3, PR_FALSE);
+
+#ifdef SSL_CBC_RANDOM_IV
+
+	/*
+	 * Enable protection against the BEAST attack in case the NSS server has
+	 * support for that. While SSLv3 is disabled, we may still allow TLSv1
+	 * which is affected. The option isn't documented as an SSL option, but as
+	 * an NSS environment variable.
+	 */
+	SSL_OptionSet(model, SSL_CBC_RANDOM_IV, PR_TRUE);
+#endif
+
+	/*
+	 * Configure the allowed ciphers. If there are no user preferred suites,
+	 * set the domestic policy.
+	 *
+	 * Historically there were different cipher policies based on export (and
+	 * import) restrictions: Domestic, Export and France. These are since long
+	 * removed with all ciphers being enabled by default. Due to backwards
+	 * compatibility, the old API is still used even though all three policies
+	 * now do the same thing.
+	 *
+	 * If SSLCipherSuites define a policy of the user, we set that rather than
+	 * enabling all ciphers via NSS_SetDomesticPolicy.
+	 *
+	 * TODO: while this code works, the set of ciphers which can be set and
+	 * still end up with a working socket is woefully underdocumented for
+	 * anything more recent than SSLv3 (the code for TLS actually calls ssl3
+	 * functions under the hood for SSL_CipherPrefSet), so it's unclear if this
+	 * is helpful or not. Using the policies works, but may be too coarsely
+	 * grained.
+	 *
+	 * Another TODO: The SSL_ImplementedCiphers table returned with calling
+	 * SSL_GetImplementedCiphers is sorted in server preference order. Sorting
+	 * SSLCipherSuites according to the order of the ciphers therein could be
+	 * a way to implement ssl_prefer_server_ciphers - if we at all want to use
+	 * cipher selection for NSS like how we do it for OpenSSL that is.
+	 */
+
+	/*
+	 * If no ciphers are specified, enable them all.
+	 */
+	if (!SSLCipherSuites || strlen(SSLCipherSuites) == 0)
+	{
+		status = NSS_SetDomesticPolicy();
+		if (status != SECSuccess)
+			ereport(ERROR,
+					(errmsg("unable to set cipher policy: %s",
+							pg_SSLerrmessage(PR_GetError()))));
+	}
+	else
+	{
+		char	   *ciphers,
+				   *c;
+
+		char	   *sep = ":;, ";
+		PRUint16	ciphercode;
+		const		PRUint16 *nss_ciphers;
+
+		/*
+		 * If the user has specified a set of preferred cipher suites we start
+		 * by turning off all the existing suites to avoid the risk of down-
+		 * grades to a weaker cipher than expected.
+		 */
+		nss_ciphers = SSL_GetImplementedCiphers();
+		for (int i = 0; i < SSL_GetNumImplementedCiphers(); i++)
+			SSL_CipherPrefSet(model, nss_ciphers[i], PR_FALSE);
+
+		ciphers = pstrdup(SSLCipherSuites);
+
+		for (c = strtok(ciphers, sep); c; c = strtok(NULL, sep))
+		{
+			ciphercode = pg_find_cipher(c);
+			if (ciphercode != INVALID_CIPHER)
+			{
+				status = SSL_CipherPrefSet(model, ciphercode, PR_TRUE);
+				if (status != SECSuccess)
+					ereport(ERROR,
+							(errmsg("invalid cipher-suite specified: %s", c)));
+			}
+		}
+
+		pfree(ciphers);
+	}
+
+	if (SSL_VersionRangeSet(model, &desired_sslver) != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to set requested SSL protocol version range")));
+
+	/*
+	 * Set up the custom IO layer.
+	 */
+	layer = init_iolayer(port);
+	if (!layer)
+		goto error;
+
+	/* Store the Port as private data available in callbacks */
+	layer->secret = (void *) port;
+
+	if (PR_PushIOLayer(pr_fd, PR_TOP_IO_LAYER, layer) != PR_SUCCESS)
+	{
+		PR_Close(layer);
+		ereport(ERROR,
+				(errmsg("unable to push IO layer")));
+	}
+
+	server_cert = PK11_FindCertFromNickname(ssl_cert_file, (void *) port);
+	if (!server_cert)
+	{
+		if (dummy_ssl_passwd_cb_called)
+			ereport(ERROR,
+					(errmsg("unable to load certificate for \"%s\": %s",
+							ssl_cert_file, pg_SSLerrmessage(PR_GetError())),
+					 errhint("The certificate requires a password.")));
+		else
+			ereport(ERROR,
+					(errmsg("unable to find certificate for \"%s\": %s",
+							ssl_cert_file, pg_SSLerrmessage(PR_GetError()))));
+	}
+
+	private_key = PK11_FindKeyByAnyCert(server_cert, (void *) port);
+	if (!private_key)
+	{
+		if (dummy_ssl_passwd_cb_called)
+			ereport(ERROR,
+					(errmsg("unable to load private key for \"%s\": %s",
+							ssl_cert_file, pg_SSLerrmessage(PR_GetError())),
+					 errhint("The private key requires a password.")));
+		else
+			ereport(ERROR,
+					(errmsg("unable to find private key for \"%s\": %s",
+							ssl_cert_file, pg_SSLerrmessage(PR_GetError()))));
+	}
+
+	/*
+	 * NSS doesn't use CRL files on disk, so we use the ssl_crl_file guc to
+	 * contain the CRL nickname for the current server certificate in the NSS
+	 * certificate database. The main difference from the OpenSSL backend is
+	 * that NSS will use the CRL regardless, but being able to make sure the
+	 * CRL is loaded seems like a good feature.
+	 */
+	if (ssl_crl_file[0])
+	{
+		SECITEM_CopyItem(NULL, &crlname, &server_cert->derSubject);
+		crl = SEC_FindCrlByName(CERT_GetDefaultCertDB(), &crlname, SEC_CRL_TYPE);
+		if (!crl)
+			ereport(ERROR,
+					(errmsg("specified CRL not found in database")));
+		SEC_DestroyCrl(crl);
+	}
+
+	/*
+	 * Finally we must configure the socket for being a server by setting the
+	 * certificate and key.
+	 */
+	status = SSL_ConfigSecureServer(model, server_cert, private_key, kt_rsa);
+	if (status != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to configure secure server: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+	status = SSL_ConfigServerCert(model, server_cert, private_key, NULL, 0);
+	if (status != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to configure server for TLS server connections: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+
+	ssl_loaded_verify_locations = true;
+
+	/*
+	 * At this point, we no longer have use for the certificate and private
+	 * key as they have been copied into the context by NSS. Destroy our
+	 * copies explicitly to clean out the memory as best we can.
+	 */
+	CERT_DestroyCertificate(server_cert);
+	SECKEY_DestroyPrivateKey(private_key);
+
+	status = SSL_AuthCertificateHook(model, pg_cert_auth_handler, (void *) port);
+	if (status != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to install authcert hook: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+	SSL_BadCertHook(model, pg_bad_cert_handler, (void *) port);
+	SSL_OptionSet(model, SSL_REQUEST_CERTIFICATE, PR_TRUE);
+	SSL_OptionSet(model, SSL_REQUIRE_CERTIFICATE, PR_FALSE);
+
+	port->pr_fd = SSL_ImportFD(model, pr_fd);
+	if (!port->pr_fd)
+		ereport(ERROR,
+				(errmsg("unable to initialize")));
+
+	PR_Close(model);
+
+	/*
+	 * Force a handshake on the next I/O request, the second parameter means
+	 * that we are a server, PR_FALSE would indicate being a client. NSPR
+	 * requires us to call SSL_ResetHandshake since we imported an already
+	 * established socket.
+	 */
+	status = SSL_ResetHandshake(port->pr_fd, PR_TRUE);
+	if (status != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to initiate handshake: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+	status = SSL_ForceHandshake(port->pr_fd);
+	if (status != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to handshake: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+
+	port->ssl_in_use = true;
+	return 0;
+
+error:
+	return 1;
+}
+
+ssize_t
+be_tls_read(Port *port, void *ptr, size_t len, int *waitfor)
+{
+	ssize_t		n_read;
+	PRErrorCode err;
+
+	n_read = PR_Read(port->pr_fd, ptr, len);
+
+	if (n_read < 0)
+	{
+		err = PR_GetError();
+
+		if (err == PR_WOULD_BLOCK_ERROR)
+		{
+			*waitfor = WL_SOCKET_READABLE;
+			errno = EWOULDBLOCK;
+		}
+		else
+			errno = ECONNRESET;
+	}
+
+	return n_read;
+}
+
+ssize_t
+be_tls_write(Port *port, void *ptr, size_t len, int *waitfor)
+{
+	ssize_t		n_write;
+	PRErrorCode err;
+	PRIntn		flags = 0;
+
+	/*
+	 * The flags parameter to PR_Send is no longer used and is, according to
+	 * the documentation, required to be zero.
+	 */
+	n_write = PR_Send(port->pr_fd, ptr, len, flags, PR_INTERVAL_NO_WAIT);
+
+	if (n_write < 0)
+	{
+		err = PR_GetError();
+
+		if (err == PR_WOULD_BLOCK_ERROR)
+		{
+			*waitfor = WL_SOCKET_WRITEABLE;
+			errno = EWOULDBLOCK;
+		}
+		else
+			errno = ECONNRESET;
+	}
+
+	return n_write;
+}
+
+void
+be_tls_close(Port *port)
+{
+	if (!port)
+		return;
+
+	if (port->peer_cn)
+	{
+		SSL_InvalidateSession(port->pr_fd);
+		pfree(port->peer_cn);
+		port->peer_cn = NULL;
+	}
+
+	PR_Close(port->pr_fd);
+	port->pr_fd = NULL;
+	port->ssl_in_use = false;
+
+	if (nss_context)
+	{
+		NSS_ShutdownContext(nss_context);
+		nss_context = NULL;
+	}
+}
+
+void
+be_tls_destroy(void)
+{
+	/*
+	 * It reads a bit odd to clear a session cache when we are destroying the
+	 * context altogether, but if the session cache isn't cleared before
+	 * shutting down the context it will fail with SEC_ERROR_BUSY.
+	 */
+	SSL_ClearSessionCache();
+}
+
+int
+be_tls_get_cipher_bits(Port *port)
+{
+	SECStatus	status;
+	SSLChannelInfo channel;
+	SSLCipherSuiteInfo suite;
+
+	status = SSL_GetChannelInfo(port->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+		goto error;
+
+	status = SSL_GetCipherSuiteInfo(channel.cipherSuite, &suite, sizeof(suite));
+	if (status != SECSuccess)
+		goto error;
+
+	return suite.effectiveKeyBits;
+
+error:
+	ereport(WARNING,
+			(errmsg("unable to extract TLS session information: %s",
+					pg_SSLerrmessage(PR_GetError()))));
+	return 0;
+}
+
+/*
+ * be_tls_get_compression
+ *
+ * NSS disabled support for TLS compression in version 3.33 and removed the
+ * code in a subsequent release. The API for retrieving information about
+ * compression as well as enabling it is kept for backwards compatibility, but
+ * we don't need to consult it since it was only available for SSLv3 which we
+ * don't support.
+ *
+ * https://bugzilla.mozilla.org/show_bug.cgi?id=1409587
+ */
+bool
+be_tls_get_compression(Port *port)
+{
+	return false;
+}
+
+/*
+ * be_tls_get_version
+ *
+ * Returns the protocol version used for the current connection, or NULL in
+ * case of errors.
+ */
+const char *
+be_tls_get_version(Port *port)
+{
+	SECStatus	status;
+	SSLChannelInfo channel;
+
+	status = SSL_GetChannelInfo(port->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+	{
+		ereport(WARNING,
+				(errmsg("unable to extract TLS session information: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+		return NULL;
+	}
+
+	return ssl_protocol_version_to_string(channel.protocolVersion);
+}
+
+const char *
+be_tls_get_cipher(Port *port)
+{
+	SECStatus	status;
+	SSLChannelInfo channel;
+	SSLCipherSuiteInfo suite;
+
+	status = SSL_GetChannelInfo(port->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+		goto error;
+
+	status = SSL_GetCipherSuiteInfo(channel.cipherSuite, &suite, sizeof(suite));
+	if (status != SECSuccess)
+		goto error;
+
+	return suite.cipherSuiteName;
+
+error:
+	ereport(WARNING,
+			(errmsg("unable to extract TLS session information: %s",
+					pg_SSLerrmessage(PR_GetError()))));
+	return NULL;
+}
+
+void
+be_tls_get_peer_subject_name(Port *port, char *ptr, size_t len)
+{
+	CERTCertificate *certificate;
+
+	certificate = SSL_PeerCertificate(port->pr_fd);
+	if (certificate)
+		strlcpy(ptr, CERT_NameToAscii(&certificate->subject), len);
+	else
+		ptr[0] = '\0';
+}
+
+void
+be_tls_get_peer_issuer_name(Port *port, char *ptr, size_t len)
+{
+	CERTCertificate *certificate;
+
+	certificate = SSL_PeerCertificate(port->pr_fd);
+	if (certificate)
+		strlcpy(ptr, CERT_NameToAscii(&certificate->issuer), len);
+	else
+		ptr[0] = '\0';
+}
+
+void
+be_tls_get_peer_serial(Port *port, char *ptr, size_t len)
+{
+	CERTCertificate *certificate;
+
+	certificate = SSL_PeerCertificate(port->pr_fd);
+	if (certificate)
+		snprintf(ptr, len, "%li", DER_GetInteger(&(certificate->serialNumber)));
+	else
+		ptr[0] = '\0';
+}
+
+/* ------------------------------------------------------------ */
+/*						Internal functions						*/
+/* ------------------------------------------------------------ */
+
+/*
+ * default_nss_tls_init
+ *
+ * The default TLS init hook function which users can override for installing
+ * their own passphrase callbacks and similar actions. In case no callback has
+ * been configured, or the callback isn't reload capable during a server
+ * reload, the dummy callback will be installed.
+ *
+ * The private data for the callback is set differently depending on how it's
+ * invoked. For calls which may invoke the callback deeper in the callstack
+ * the private data is set with SSL_SetPKCS11PinArg. When the call is directly
+ * invoking the callback, like PK11_FindCertFromNickname, then the private
+ * data is passed as a parameter. Setting the data with SSL_SetPKCS11PinArg is
+ * thus not required but good practice.
+ *
+ * NSS doesn't provide a default callback like OpenSSL does, but a callback is
+ * required to be set.  The password callback can be installed at any time, but
+ * setting the private data with SSL_SetPKCS11PinArg requires a PR Filedesc.
+ */
+static void
+default_nss_tls_init(bool isServerStart)
+{
+	/*
+	 * No user-defined callback has been configured, install the dummy call-
+	 * back since we must set something.
+	 */
+	if (!ssl_passphrase_command[0])
+		PK11_SetPasswordFunc(dummy_ssl_passphrase_cb);
+	else
+	{
+		/*
+		 * There is a user-defined callback, set it unless we are in a restart
+		 * and cannot handle restarts due to an interactive callback.
+		 */
+		if (isServerStart)
+			PK11_SetPasswordFunc(external_ssl_passphrase_cb);
+		else
+		{
+			if (ssl_passphrase_command_supports_reload)
+				PK11_SetPasswordFunc(external_ssl_passphrase_cb);
+			else
+				PK11_SetPasswordFunc(dummy_ssl_passphrase_cb);
+		}
+	}
+}
+
+/*
+ * external_ssl_passphrase_cb
+ *
+ * Runs the callback configured by ssl_passphrase_command and returns the
+ * captured password back to NSS.
+ */
+static char *
+external_ssl_passphrase_cb(PK11SlotInfo *slot, PRBool retry, void *arg)
+{
+	/*
+	 * NSS use a hardcoded 256 byte buffer for reading the password so set the
+	 * same limit for our callback buffer.
+	 */
+	char		buf[256];
+	int			len;
+	char	   *password = NULL;
+	char	   *prompt;
+
+	/*
+	 * Since there is no password callback in NSS when the server starts up,
+	 * it makes little sense to create an interactive callback. Thus, if this
+	 * is a retry attempt then give up immediately.
+	 */
+	if (retry)
+		return NULL;
+
+	/*
+	 * Construct the same prompt that NSS uses internally even though it is
+	 * unlikely to serve much purpose, but we must set a prompt so we might
+	 * as well do it right.
+	 */
+	prompt = psprintf("Enter Password or Pin for \"%s\":",
+					  PK11_GetTokenName(slot));
+
+	len = run_ssl_passphrase_command(prompt, ssl_is_server_start, buf, sizeof(buf));
+	pfree(prompt);
+
+	if (!len)
+		return NULL;
+
+	/*
+	 * At least one byte with password content was returned, and NSS requires
+	 * that we return it allocated in NSS controlled memory. If we fail to
+	 * allocate then abort without passing back NULL and bubble up the error
+	 * on the PG side.
+	 */
+	password = (char *) PR_Malloc(len + 1);
+	if (!password)
+	{
+		explicit_bzero(buf, sizeof(buf));
+		ereport(ERROR,
+				(errcode(ERRCODE_OUT_OF_MEMORY),
+				 errmsg("out of memory")));
+	}
+	strlcpy(password, buf, sizeof(password));
+	explicit_bzero(buf, sizeof(buf));
+
+	return password;
+}
+
+/*
+ * dummy_ssl_passphrase_cb
+ *
+ * Return unsuccessful if we are asked to provide the passphrase for a cert or
+ * key, without having a passphrase callback installed.
+ */
+static char *
+dummy_ssl_passphrase_cb(PK11SlotInfo *slot, PRBool retry, void *arg)
+{
+	dummy_ssl_passwd_cb_called = true;
+	return NULL;
+}
+
+static SECStatus
+pg_bad_cert_handler(void *arg, PRFileDesc * fd)
+{
+	Port	   *port = (Port *) arg;
+
+	port->peer_cert_valid = false;
+	return SECFailure;
+}
+
+static SECStatus
+pg_cert_auth_handler(void *arg, PRFileDesc * fd, PRBool checksig, PRBool isServer)
+{
+	SECStatus	status;
+	Port	   *port = (Port *) arg;
+	CERTCertificate *cert;
+	char	   *peer_cn;
+	int			len;
+
+	status = SSL_AuthCertificate(CERT_GetDefaultCertDB(), port->pr_fd, checksig, PR_TRUE);
+	if (status == SECSuccess)
+	{
+		cert = SSL_PeerCertificate(port->pr_fd);
+		len = strlen(cert->subjectName);
+		peer_cn = MemoryContextAllocZero(TopMemoryContext, len + 1);
+		/*
+		 * Skip over the key= portion of the key=value containing the the
+		 * peer CN.
+		 */
+		if (strncmp(cert->subjectName, "CN=", 3) == 0)
+			strlcpy(peer_cn, cert->subjectName + strlen("CN="), len + 1);
+		else
+			strlcpy(peer_cn, cert->subjectName, len + 1);
+		CERT_DestroyCertificate(cert);
+
+		port->peer_cn = peer_cn;
+		port->peer_cert_valid = true;
+	}
+
+	return status;
+}
+
+static PRInt32
+pg_ssl_read(PRFileDesc *fd, void *buf, PRInt32 amount, PRIntn flags,
+			PRIntervalTime timeout)
+{
+	PRRecvFN	read_fn;
+	PRInt32		n_read;
+
+	read_fn = fd->lower->methods->recv;
+	n_read = read_fn(fd->lower, buf, amount, flags, timeout);
+
+	return n_read;
+}
+
+static PRInt32
+pg_ssl_write(PRFileDesc *fd, const void *buf, PRInt32 amount, PRIntn flags,
+			 PRIntervalTime timeout)
+{
+	PRSendFN	send_fn;
+	PRInt32		n_write;
+
+	send_fn = fd->lower->methods->send;
+	n_write = send_fn(fd->lower, buf, amount, flags, timeout);
+
+	return n_write;
+}
+
+static PRFileDesc *
+init_iolayer(Port *port)
+{
+	const		PRIOMethods *default_methods;
+	PRFileDesc *layer;
+
+	/*
+	 * Start by initializing our layer with all the default methods so that we
+	 * can selectively override the ones we want while still ensuring that we
+	 * have a complete layer specification.
+	 */
+	default_methods = PR_GetDefaultIOMethods();
+	memcpy(&pr_iomethods, default_methods, sizeof(PRIOMethods));
+
+	pr_iomethods.recv = pg_ssl_read;
+	pr_iomethods.send = pg_ssl_write;
+
+	/*
+	 * Each IO layer must be identified by a unique name, where uniqueness is
+	 * per connection. Each connection in a postgres cluster can generate the
+	 * identity from the same string as they will create their IO layers on
+	 * different sockets. Only one layer per socket can have the same name.
+	 */
+	pr_id = PR_GetUniqueIdentity("PostgreSQL Server");
+	if (pr_id == PR_INVALID_IO_LAYER)
+	{
+		ereport(ERROR,
+				(errmsg("out of memory when setting up TLS connection")));
+		return NULL;
+	}
+
+	/*
+	 * Create the actual IO layer as a stub such that it can be pushed onto
+	 * the layer stack. The step via a stub is required as we define custom
+	 * callbacks.
+	 */
+	layer = PR_CreateIOLayerStub(pr_id, &pr_iomethods);
+	if (!layer)
+	{
+		ereport(ERROR,
+				(errmsg("unable to create NSS I/O layer")));
+		return NULL;
+	}
+
+	return layer;
+}
+
+static char *
+ssl_protocol_version_to_string(int v)
+{
+	switch (v)
+	{
+			/* SSL v2 and v3 are not supported */
+		case SSL_LIBRARY_VERSION_2:
+		case SSL_LIBRARY_VERSION_3_0:
+			Assert(false);
+			break;
+
+		case SSL_LIBRARY_VERSION_TLS_1_0:
+			return pstrdup("TLSv1.0");
+		case SSL_LIBRARY_VERSION_TLS_1_1:
+			return pstrdup("TLSv1.1");
+		case SSL_LIBRARY_VERSION_TLS_1_2:
+			return pstrdup("TLSv1.2");
+		case SSL_LIBRARY_VERSION_TLS_1_3:
+			return pstrdup("TLSv1.3");
+	}
+
+	return pstrdup("unknown");
+}
+
+
+/*
+ * ssl_protocol_version_to_nss
+ *			Translate PostgreSQL TLS version to NSS version
+ *
+ * Returns zero in case the requested TLS version is undefined (PG_ANY) and
+ * should be set by the caller, or -1 on failure.
+ */
+static uint16
+ssl_protocol_version_to_nss(int v, const char *guc_name)
+{
+	switch (v)
+	{
+			/*
+			 * There is no SSL_LIBRARY_ macro defined in NSS with the value
+			 * zero, so we use this to signal the caller that the highest
+			 * useful version should be set on the connection.
+			 */
+		case PG_TLS_ANY:
+			return 0;
+
+			/*
+			 * No guard is required here as there are no versions of NSS
+			 * without support for TLS1.
+			 */
+		case PG_TLS1_VERSION:
+			return SSL_LIBRARY_VERSION_TLS_1_0;
+		case PG_TLS1_1_VERSION:
+#ifdef SSL_LIBRARY_VERSION_TLS_1_1
+			return SSL_LIBRARY_VERSION_TLS_1_1;
+#else
+			break;
+#endif
+		case PG_TLS1_2_VERSION:
+#ifdef SSL_LIBRARY_VERSION_TLS_1_2
+			return SSL_LIBRARY_VERSION_TLS_1_2;
+#else
+			break;
+#endif
+		case PG_TLS1_3_VERSION:
+#ifdef SSL_LIBRARY_VERSION_TLS_1_3
+			return SSL_LIBRARY_VERSION_TLS_1_3;
+#else
+			break;
+#endif
+		default:
+			break;
+	}
+
+	return -1;
+}
+
+/*
+ * pg_SSLerrmessage
+ *		Create and return a human readable error message given
+ *		the specified error code
+ *
+ * PR_ErrorToName only converts the enum identifier of the error to string,
+ * but that can be quite useful for debugging (and in case PR_ErrorToString is
+ * unable to render a message then we at least have something).
+ */
+static char *
+pg_SSLerrmessage(PRErrorCode errcode)
+{
+	return psprintf("%s (%s)",
+					PR_ErrorToString(errcode, PR_LANGUAGE_I_DEFAULT),
+					PR_ErrorToName(errcode));
+}
diff --git a/src/backend/libpq/be-secure.c b/src/backend/libpq/be-secure.c
index 2ae507a902..f39977b80c 100644
--- a/src/backend/libpq/be-secure.c
+++ b/src/backend/libpq/be-secure.c
@@ -49,6 +49,9 @@ bool		ssl_passphrase_command_supports_reload;
 #ifdef USE_SSL
 bool		ssl_loaded_verify_locations = false;
 #endif
+#ifdef USE_NSS
+char	   *ssl_database;
+#endif
 
 /* GUC variable controlling SSL cipher list */
 char	   *SSLCipherSuites = NULL;
diff --git a/src/backend/libpq/hba.c b/src/backend/libpq/hba.c
index 4c86fb6087..8821c60a34 100644
--- a/src/backend/libpq/hba.c
+++ b/src/backend/libpq/hba.c
@@ -1040,7 +1040,7 @@ parse_hba_line(TokenizedLine *tok_line, int elevel)
 			ereport(elevel,
 					(errcode(ERRCODE_CONFIG_FILE_ERROR),
 					 errmsg("hostssl record cannot match because SSL is not supported by this build"),
-					 errhint("Compile with --with-openssl to use SSL connections."),
+					 errhint("Compile with --with-openssl or --with-nss to use SSL connections."),
 					 errcontext("line %d of configuration file \"%s\"",
 								line_num, HbaFileName)));
 			*err_msg = "hostssl record cannot match because SSL is not supported by this build";
diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c
index a62d64eaa4..050f673c68 100644
--- a/src/backend/utils/misc/guc.c
+++ b/src/backend/utils/misc/guc.c
@@ -4262,7 +4262,11 @@ static struct config_string ConfigureNamesString[] =
 		},
 		&ssl_library,
 #ifdef USE_SSL
+#if defined(USE_OPENSSL)
 		"OpenSSL",
+#elif defined(USE_NSS)
+		"NSS",
+#endif
 #else
 		"",
 #endif
@@ -4320,6 +4324,18 @@ static struct config_string ConfigureNamesString[] =
 		check_canonical_path, assign_pgstat_temp_directory, NULL
 	},
 
+#ifdef USE_NSS
+	{
+		{"ssl_database", PGC_SIGHUP, CONN_AUTH_SSL,
+			gettext_noop("Location of the NSS certificate database."),
+			NULL
+		},
+		&ssl_database,
+		"",
+		NULL, NULL, NULL
+	},
+#endif
+
 	{
 		{"synchronous_standby_names", PGC_SIGHUP, REPLICATION_PRIMARY,
 			gettext_noop("Number of synchronous standbys and list of names of potential synchronous ones."),
@@ -4348,8 +4364,10 @@ static struct config_string ConfigureNamesString[] =
 			GUC_SUPERUSER_ONLY
 		},
 		&SSLCipherSuites,
-#ifdef USE_OPENSSL
+#if defined(USE_OPENSSL)
 		"HIGH:MEDIUM:+3DES:!aNULL",
+#elif defined (USE_NSS)
+		"",
 #else
 		"none",
 #endif
diff --git a/src/include/common/pg_nss.h b/src/include/common/pg_nss.h
new file mode 100644
index 0000000000..9205f0fc3b
--- /dev/null
+++ b/src/include/common/pg_nss.h
@@ -0,0 +1,141 @@
+/*-------------------------------------------------------------------------
+ *
+ * pg_nss.h
+ *	  Support for NSS as a TLS backend
+ *
+ * These definitions are used by both frontend and backend code.
+ *
+ * Copyright (c) 2020, PostgreSQL Global Development Group
+ *
+ * IDENTIFICATION
+ *        src/include/common/pg_nss.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef PG_NSS_H
+#define PG_NSS_H
+
+#ifdef USE_NSS
+
+#include <nss/sslproto.h>
+
+PRUint16	pg_find_cipher(char *name);
+
+typedef struct
+{
+	const char *name;
+	PRUint16	number;
+}			NSSCiphers;
+
+#define INVALID_CIPHER	0xFFFF
+
+/*
+ * This list is a partial copy of the ciphers in NSS files lib/ssl/sslproto.h
+ * in order to provide a human readable version of the ciphers. It would be
+ * nice to not have to have this, but NSS doesn't provide any API addressing
+ * the ciphers by name. TODO: do we want more of the ciphers, or perhaps less?
+ */
+static const NSSCiphers NSS_CipherList[] = {
+
+	{"TLS_NULL_WITH_NULL_NULL", TLS_NULL_WITH_NULL_NULL},
+
+	{"TLS_RSA_WITH_NULL_MD5", TLS_RSA_WITH_NULL_MD5},
+	{"TLS_RSA_WITH_NULL_SHA", TLS_RSA_WITH_NULL_SHA},
+	{"TLS_RSA_WITH_RC4_128_MD5", TLS_RSA_WITH_RC4_128_MD5},
+	{"TLS_RSA_WITH_RC4_128_SHA", TLS_RSA_WITH_RC4_128_SHA},
+	{"TLS_RSA_WITH_IDEA_CBC_SHA", TLS_RSA_WITH_IDEA_CBC_SHA},
+	{"TLS_RSA_WITH_DES_CBC_SHA", TLS_RSA_WITH_DES_CBC_SHA},
+	{"TLS_RSA_WITH_3DES_EDE_CBC_SHA", TLS_RSA_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_DH_DSS_WITH_DES_CBC_SHA", TLS_DH_DSS_WITH_DES_CBC_SHA},
+	{"TLS_DH_DSS_WITH_3DES_EDE_CBC_SHA", TLS_DH_DSS_WITH_3DES_EDE_CBC_SHA},
+	{"TLS_DH_RSA_WITH_DES_CBC_SHA", TLS_DH_RSA_WITH_DES_CBC_SHA},
+	{"TLS_DH_RSA_WITH_3DES_EDE_CBC_SHA", TLS_DH_RSA_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_DHE_DSS_WITH_DES_CBC_SHA", TLS_DHE_DSS_WITH_DES_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_3DES_EDE_CBC_SHA", TLS_DHE_DSS_WITH_3DES_EDE_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_DES_CBC_SHA", TLS_DHE_RSA_WITH_DES_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA", TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_DH_anon_WITH_RC4_128_MD5", TLS_DH_anon_WITH_RC4_128_MD5},
+	{"TLS_DH_anon_WITH_DES_CBC_SHA", TLS_DH_anon_WITH_DES_CBC_SHA},
+	{"TLS_DH_anon_WITH_3DES_EDE_CBC_SHA", TLS_DH_anon_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_RSA_WITH_AES_128_CBC_SHA", TLS_RSA_WITH_AES_128_CBC_SHA},
+	{"TLS_DH_DSS_WITH_AES_128_CBC_SHA", TLS_DH_DSS_WITH_AES_128_CBC_SHA},
+	{"TLS_DH_RSA_WITH_AES_128_CBC_SHA", TLS_DH_RSA_WITH_AES_128_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_AES_128_CBC_SHA", TLS_DHE_DSS_WITH_AES_128_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_AES_128_CBC_SHA", TLS_DHE_RSA_WITH_AES_128_CBC_SHA},
+	{"TLS_DH_anon_WITH_AES_128_CBC_SHA", TLS_DH_anon_WITH_AES_128_CBC_SHA},
+
+	{"TLS_RSA_WITH_AES_256_CBC_SHA", TLS_RSA_WITH_AES_256_CBC_SHA},
+	{"TLS_DH_DSS_WITH_AES_256_CBC_SHA", TLS_DH_DSS_WITH_AES_256_CBC_SHA},
+	{"TLS_DH_RSA_WITH_AES_256_CBC_SHA", TLS_DH_RSA_WITH_AES_256_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_AES_256_CBC_SHA", TLS_DHE_DSS_WITH_AES_256_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_AES_256_CBC_SHA", TLS_DHE_RSA_WITH_AES_256_CBC_SHA},
+	{"TLS_DH_anon_WITH_AES_256_CBC_SHA", TLS_DH_anon_WITH_AES_256_CBC_SHA},
+	{"TLS_RSA_WITH_NULL_SHA256", TLS_RSA_WITH_NULL_SHA256},
+	{"TLS_RSA_WITH_AES_128_CBC_SHA256", TLS_RSA_WITH_AES_128_CBC_SHA256},
+	{"TLS_RSA_WITH_AES_256_CBC_SHA256", TLS_RSA_WITH_AES_256_CBC_SHA256},
+
+	{"TLS_DHE_DSS_WITH_AES_128_CBC_SHA256", TLS_DHE_DSS_WITH_AES_128_CBC_SHA256},
+	{"TLS_RSA_WITH_CAMELLIA_128_CBC_SHA", TLS_RSA_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DH_DSS_WITH_CAMELLIA_128_CBC_SHA", TLS_DH_DSS_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DH_RSA_WITH_CAMELLIA_128_CBC_SHA", TLS_DH_RSA_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_CAMELLIA_128_CBC_SHA", TLS_DHE_DSS_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA", TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DH_anon_WITH_CAMELLIA_128_CBC_SHA", TLS_DH_anon_WITH_CAMELLIA_128_CBC_SHA},
+
+	{"TLS_DHE_DSS_WITH_RC4_128_SHA", TLS_DHE_DSS_WITH_RC4_128_SHA},
+	{"TLS_DHE_RSA_WITH_AES_128_CBC_SHA256", TLS_DHE_RSA_WITH_AES_128_CBC_SHA256},
+	{"TLS_DHE_DSS_WITH_AES_256_CBC_SHA256", TLS_DHE_DSS_WITH_AES_256_CBC_SHA256},
+	{"TLS_DHE_RSA_WITH_AES_256_CBC_SHA256", TLS_DHE_RSA_WITH_AES_256_CBC_SHA256},
+
+	{"TLS_RSA_WITH_CAMELLIA_256_CBC_SHA", TLS_RSA_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DH_DSS_WITH_CAMELLIA_256_CBC_SHA", TLS_DH_DSS_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DH_RSA_WITH_CAMELLIA_256_CBC_SHA", TLS_DH_RSA_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_CAMELLIA_256_CBC_SHA", TLS_DHE_DSS_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA", TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DH_anon_WITH_CAMELLIA_256_CBC_SHA", TLS_DH_anon_WITH_CAMELLIA_256_CBC_SHA},
+
+	{"TLS_RSA_WITH_SEED_CBC_SHA", TLS_RSA_WITH_SEED_CBC_SHA},
+
+	{"TLS_RSA_WITH_AES_128_GCM_SHA256", TLS_RSA_WITH_AES_128_GCM_SHA256},
+	{"TLS_RSA_WITH_AES_256_GCM_SHA384", TLS_RSA_WITH_AES_256_GCM_SHA384},
+	{"TLS_DHE_RSA_WITH_AES_128_GCM_SHA256", TLS_DHE_RSA_WITH_AES_128_GCM_SHA256},
+	{"TLS_DHE_RSA_WITH_AES_256_GCM_SHA384", TLS_DHE_RSA_WITH_AES_256_GCM_SHA384},
+	{"TLS_DHE_DSS_WITH_AES_128_GCM_SHA256", TLS_DHE_DSS_WITH_AES_128_GCM_SHA256},
+	{"TLS_DHE_DSS_WITH_AES_256_GCM_SHA384", TLS_DHE_DSS_WITH_AES_256_GCM_SHA384},
+
+	{"TLS_AES_128_GCM_SHA256", TLS_AES_128_GCM_SHA256},
+	{"TLS_AES_256_GCM_SHA384", TLS_AES_256_GCM_SHA384},
+	{"TLS_CHACHA20_POLY1305_SHA256", TLS_CHACHA20_POLY1305_SHA256},
+	{NULL, 0}
+};
+
+/*
+ * pg_find_cipher
+ *			Translate an NSS ciphername to the cipher code
+ *
+ * Searches the configured ciphers for the corresponding cipher code to the
+ * name. Search is performed case insensitive.
+ */
+PRUint16
+pg_find_cipher(char *name)
+{
+	const		NSSCiphers *cipher_list = NSS_CipherList;
+
+	while (cipher_list->name)
+	{
+		if (pg_strcasecmp(cipher_list->name, name) == 0)
+			return cipher_list->number;
+
+		cipher_list++;
+	}
+
+	return 0xFFFF;
+}
+
+#endif							/* USE_NSS */
+
+#endif							/* PG_NSS_H */
diff --git a/src/include/libpq/libpq-be.h b/src/include/libpq/libpq-be.h
index 0a23281ad5..b68ef64ec9 100644
--- a/src/include/libpq/libpq-be.h
+++ b/src/include/libpq/libpq-be.h
@@ -192,13 +192,18 @@ typedef struct Port
 	bool		peer_cert_valid;
 
 	/*
-	 * OpenSSL structures. (Keep these last so that the locations of other
-	 * fields are the same whether or not you build with OpenSSL.)
+	 * SSL backend specific structures. (Keep these last so that the locations
+	 * of other fields are the same whether or not you build with SSL
+	 * enabled.)
 	 */
 #ifdef USE_OPENSSL
 	SSL		   *ssl;
 	X509	   *peer;
 #endif
+
+#ifdef USE_NSS
+	void	   *pr_fd;
+#endif
 } Port;
 
 #ifdef USE_SSL
@@ -292,6 +297,10 @@ extern char *be_tls_get_certificate_hash(Port *port, size_t *len);
 typedef void (*openssl_tls_init_hook_typ) (SSL_CTX *context, bool isServerStart);
 extern PGDLLIMPORT openssl_tls_init_hook_typ openssl_tls_init_hook;
 #endif
+#ifdef USE_NSS
+typedef void (*nss_tls_init_hook_type) (bool isServerStart);
+extern PGDLLIMPORT nss_tls_init_hook_type nss_tls_init_hook;
+#endif
 
 #endif							/* USE_SSL */
 
diff --git a/src/include/libpq/libpq.h b/src/include/libpq/libpq.h
index b1152475ac..298d87ecae 100644
--- a/src/include/libpq/libpq.h
+++ b/src/include/libpq/libpq.h
@@ -88,6 +88,9 @@ extern PGDLLIMPORT bool ssl_passphrase_command_supports_reload;
 #ifdef USE_SSL
 extern bool ssl_loaded_verify_locations;
 #endif
+#ifdef USE_NSS
+extern char *ssl_database;
+#endif
 
 extern int	secure_initialize(bool isServerStart);
 extern bool secure_loaded_verify_locations(void);
diff --git a/src/include/pg_config.h.in b/src/include/pg_config.h.in
index fb270df678..31f808398c 100644
--- a/src/include/pg_config.h.in
+++ b/src/include/pg_config.h.in
@@ -893,6 +893,9 @@
 /* Define to 1 to build with PAM support. (--with-pam) */
 #undef USE_PAM
 
+/* Define to build with NSS support (--with-nss) */
+#undef USE_NSS
+
 /* Define to 1 to use software CRC-32C implementation (slicing-by-8). */
 #undef USE_SLICING_BY_8_CRC32C
 
diff --git a/src/include/pg_config_manual.h b/src/include/pg_config_manual.h
index 705dc69c06..c28b84126d 100644
--- a/src/include/pg_config_manual.h
+++ b/src/include/pg_config_manual.h
@@ -176,10 +176,9 @@
 
 /*
  * USE_SSL code should be compiled only when compiling with an SSL
- * implementation.  (Currently, only OpenSSL is supported, but we might add
- * more implementations in the future.)
+ * implementation.
  */
-#ifdef USE_OPENSSL
+#if defined(USE_OPENSSL) || defined(USE_NSS)
 #define USE_SSL
 #endif
 
diff --git a/src/interfaces/libpq/Makefile b/src/interfaces/libpq/Makefile
index 4ac5f4b340..7b396d04af 100644
--- a/src/interfaces/libpq/Makefile
+++ b/src/interfaces/libpq/Makefile
@@ -45,9 +45,13 @@ OBJS = \
 	pqexpbuffer.o \
 	fe-auth.o
 
+ifeq ($(with_ssl),yes)
+OBJS += \
+	fe-secure-common.o
+endif
+
 ifeq ($(with_openssl),yes)
 OBJS += \
-	fe-secure-common.o \
 	fe-secure-openssl.o
 endif
 
@@ -57,6 +61,11 @@ OBJS += \
 	fe-secure-gssapi.o
 endif
 
+ifeq ($(with_nss), yes)
+OBJS += \
+	fe-secure-nss.o
+endif
+
 ifeq ($(PORTNAME), cygwin)
 override shlib = cyg$(NAME)$(DLSUFFIX)
 endif
diff --git a/src/interfaces/libpq/fe-connect.c b/src/interfaces/libpq/fe-connect.c
index b0ca37c2ed..a15a89c50c 100644
--- a/src/interfaces/libpq/fe-connect.c
+++ b/src/interfaces/libpq/fe-connect.c
@@ -355,6 +355,10 @@ static const internalPQconninfoOption PQconninfoOptions[] = {
 		"Target-Session-Attrs", "", 11, /* sizeof("read-write") = 11 */
 	offsetof(struct pg_conn, target_session_attrs)},
 
+	{"cert_database", NULL, NULL, NULL,
+		"CertificateDatabase", "", 64,
+	offsetof(struct pg_conn, cert_database)},
+
 	/* Terminating entry --- MUST BE LAST */
 	{NULL, NULL, NULL, NULL,
 	NULL, NULL, 0}
diff --git a/src/interfaces/libpq/fe-secure-nss.c b/src/interfaces/libpq/fe-secure-nss.c
new file mode 100644
index 0000000000..395147f551
--- /dev/null
+++ b/src/interfaces/libpq/fe-secure-nss.c
@@ -0,0 +1,1018 @@
+/*-------------------------------------------------------------------------
+ *
+ * fe-secure-nss.c
+ *	  functions for supporting NSS as a TLS backend for frontend libpq
+ *
+ * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ *	  src/interfaces/libpq/fe-secure-nss.c
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#include "postgres_fe.h"
+
+#include "libpq-fe.h"
+#include "fe-auth.h"
+#include "fe-secure-common.h"
+#include "libpq-int.h"
+
+/*
+ * BITS_PER_BYTE is also defined in the NSPR header files, so we need to undef
+ * our version to avoid compiler warnings on redefinition.
+ */
+#define pg_BITS_PER_BYTE BITS_PER_BYTE
+#undef BITS_PER_BYTE
+
+/*
+ * The nspr/obsolete/protypes.h NSPR header typedefs uint64 and int64 with
+ * colliding definitions from ours, causing a much expected compiler error.
+ * Remove backwards compatibility with ancient NSPR versions to avoid this.
+ */
+#define NO_NSPR_10_SUPPORT
+#include <nspr/nspr.h>
+#include <nspr/prerror.h>
+#include <nspr/prinit.h>
+#include <nspr/prio.h>
+#include <nss/nss.h>
+#include <nss/ssl.h>
+#include <nss/sslproto.h>
+#include <nss/pk11func.h>
+#include <nss/secerr.h>
+#include <nss/secmod.h>
+
+/*
+ * Ensure that the colliding definitions match, else throw an error. In case
+ * NSPR remove the definition in a future version (however unlikely that may
+ * be, make sure to put ours back again.
+ */
+#if defined(BITS_PER_BYTE)
+#if BITS_PER_BYTE != pg_BITS_PER_BYTE
+#error "incompatible byte widths between NSPR and PostgreSQL"
+#endif
+#else
+#define BITS_PER_BYTE pg_BITS_PER_BYTE
+#endif
+#undef pg_BITS_PER_BYTE
+
+static SECStatus pg_load_nss_module(SECMODModule * *module, const char *library, const char *name);
+static SECStatus pg_bad_cert_handler(void *arg, PRFileDesc * fd);
+static const char *pg_SSLerrmessage(PRErrorCode errcode);
+static SECStatus pg_client_auth_handler(void *arg, PRFileDesc * socket, CERTDistNames * caNames,
+										CERTCertificate * *pRetCert, SECKEYPrivateKey * *pRetKey);
+static SECStatus pg_cert_auth_handler(void *arg, PRFileDesc * fd, PRBool checksig, PRBool isServer);
+static int	ssl_protocol_version_to_nss(const char *protocol);
+static bool cert_database_has_CA(PGconn *conn);
+
+static char *PQssl_passwd_cb(PK11SlotInfo * slot, PRBool retry, void *arg);
+
+/*
+ * PR_ImportTCPSocket() is a private API, but very widely used, as it's the
+ * only way to make NSS use an already set up POSIX file descriptor rather
+ * than opening one itself. To quote the NSS documentation:
+ *
+ *		"In theory, code that uses PR_ImportTCPSocket may break when NSPR's
+ *		implementation changes. In practice, this is unlikely to happen because
+ *		NSPR's implementation has been stable for years and because of NSPR's
+ *		strong commitment to backward compatibility."
+ *
+ * https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSPR/Reference/PR_ImportTCPSocket
+ *
+ * The function is declared in <private/pprio.h>, but as it is a header marked
+ * private we declare it here rather than including it.
+ */
+NSPR_API(PRFileDesc *) PR_ImportTCPSocket(int);
+
+static SECMODModule * ca_trust = NULL;
+static NSSInitContext * nss_context = NULL;
+
+/*
+ * Track whether the NSS database has a password set or not. There is no API
+ * function for retrieving password status, so we simply flip this to true in
+ * case NSS invoked the password callback - as that will only happen in case
+ * there is a password. The reason for tracking this is that there are calls
+ * which require a password parameter, but doesn't use the callbacks provided,
+ * so we must call the callback on behalf of these.
+ */
+static bool has_password = false;
+
+/*
+ * This logic exist in NSS as well, but it's only available for when there is
+ * a database to open, and not only using the system trust store. Thus, we
+ * need to keep our own copy.
+ */
+#if defined(WIN32)
+static const char *ca_trust_name = "nssckbi.dll";
+#elif defined(__darwin__)
+static const char *ca_trust_name = "libnssckbi.dylib";
+#else
+static const char *ca_trust_name = "libnssckbi.so";
+#endif
+
+static PQsslKeyPassHook_nss_type PQsslKeyPassHook = NULL;
+
+/* ------------------------------------------------------------ */
+/*			 Procedures common to all secure sessions			*/
+/* ------------------------------------------------------------ */
+
+/*
+ * pgtls_init_library
+ *
+ * There is no direct equivalent for PQinitOpenSSL in NSS/NSPR, with PR_Init
+ * being the closest match there is. PR_Init is however already documented to
+ * not be required so simply making this a noop seems like the best option.
+ */
+void
+pgtls_init_library(bool do_ssl, int do_crypto)
+{
+	/* noop */
+}
+
+int
+pgtls_init(PGconn *conn)
+{
+	conn->ssl_in_use = false;
+
+	return 0;
+}
+
+void
+pgtls_close(PGconn *conn)
+{
+	if (nss_context)
+	{
+		NSS_ShutdownContext(nss_context);
+		nss_context = NULL;
+	}
+}
+
+PostgresPollingStatusType
+pgtls_open_client(PGconn *conn)
+{
+	SECStatus	status;
+	PRFileDesc *pr_fd;
+	PRFileDesc *model;
+	NSSInitParameters params;
+	SSLVersionRange desired_range;
+
+	/*
+	 * The NSPR documentation states that runtime initialization via PR_Init
+	 * is no longer required, as the first caller into NSPR will perform the
+	 * initialization implicitly. See be-secure-nss.c for further discussion
+	 * on PR_Init.
+	 */
+	PR_Init(PR_USER_THREAD, PR_PRIORITY_NORMAL, 0);
+
+	/*
+	 * NSS initialization and the use of contexts is further discussed in
+	 * be-secure-nss.c
+	 */
+	memset(&params, 0, sizeof(params));
+	params.length = sizeof(params);
+
+	if (conn->cert_database && strlen(conn->cert_database) > 0)
+	{
+		char	   *cert_database_path = psprintf("sql:%s", conn->cert_database);
+
+		nss_context = NSS_InitContext(cert_database_path, "", "", "",
+									  &params,
+									  NSS_INIT_READONLY | NSS_INIT_PK11RELOAD);
+		pfree(cert_database_path);
+	}
+	else
+		nss_context = NSS_InitContext("", "", "", "", &params,
+									  NSS_INIT_READONLY | NSS_INIT_NOCERTDB |
+									  NSS_INIT_NOMODDB | NSS_INIT_FORCEOPEN |
+									  NSS_INIT_NOROOTINIT | NSS_INIT_PK11RELOAD);
+
+	if (!nss_context)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to %s certificate database: %s"),
+						  conn->cert_database ? "open" : "create",
+						  pg_SSLerrmessage(PR_GetError()));
+
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * Configure cipher policy.
+	 */
+	status = NSS_SetDomesticPolicy();
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to configure cipher policy: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * If we don't have a certificate database, the system trust store is the
+	 * fallback we can use. If we fail to initialize that as well, we can
+	 * still attempt a connection as long as the sslmode isn't verify*.
+	 */
+	if (!conn->cert_database && conn->sslmode[0] == 'v')
+	{
+		status = pg_load_nss_module(&ca_trust, ca_trust_name, "\"Root Certificates\"");
+		if (status != SECSuccess)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("WARNING: unable to load NSS trust module \"%s\" : %s"),
+							  ca_trust_name,
+							  pg_SSLerrmessage(PR_GetError()));
+
+			return PGRES_POLLING_FAILED;
+		}
+	}
+
+
+	PK11_SetPasswordFunc(PQssl_passwd_cb);
+
+	/*
+	 * Import the already opened socket as we don't want to use NSPR functions
+	 * for opening the network socket due to how the PostgreSQL protocol works
+	 * with TLS connections. This function is not part of the NSPR public API,
+	 * see the comment at the top of the file for the rationale of still using
+	 * it.
+	 */
+	pr_fd = PR_ImportTCPSocket(conn->sock);
+	if (!pr_fd)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to attach to socket: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * Most of the documentation available, and implementations of, NSS/NSPR
+	 * use the PR_NewTCPSocket() function here, which has the drawback that it
+	 * can only create IPv4 sockets. Instead use PR_OpenTCPSocket() which
+	 * copes with IPv6 as well.
+	 */
+	model = SSL_ImportFD(NULL, PR_OpenTCPSocket(conn->laddr.addr.ss_family));
+	if (!model)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to enable TLS: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/* Disable old protocol versions (SSLv2 and SSLv3) */
+	SSL_OptionSet(model, SSL_ENABLE_SSL2, PR_FALSE);
+	SSL_OptionSet(model, SSL_V2_COMPATIBLE_HELLO, PR_FALSE);
+	SSL_OptionSet(model, SSL_ENABLE_SSL3, PR_FALSE);
+
+#ifdef SSL_CBC_RANDOM_IV
+
+	/*
+	 * Enable protection against the BEAST attack in case the NSS library has
+	 * support for that. While SSLv3 is disabled, we may still allow TLSv1
+	 * which is affected. The option isn't documented as an SSL option, but as
+	 * an NSS environment variable.
+	 */
+	SSL_OptionSet(model, SSL_CBC_RANDOM_IV, PR_TRUE);
+#endif
+
+	/* Set us up as a TLS client for the handshake */
+	SSL_OptionSet(model, SSL_HANDSHAKE_AS_CLIENT, PR_TRUE);
+
+	/*
+	 * When setting the available protocols, we either use the user defined
+	 * configuration values, and if missing we accept whatever is the highest
+	 * version supported by the library as the max and only limit the range in
+	 * the other end at TLSv1.0. ssl_variant_stream is a ProtocolVariant enum
+	 * for Stream protocols, rather than datagram.
+	 */
+	SSL_VersionRangeGetSupported(ssl_variant_stream, &desired_range);
+	desired_range.min = SSL_LIBRARY_VERSION_TLS_1_0;
+
+	if (conn->ssl_min_protocol_version && strlen(conn->ssl_min_protocol_version) > 0)
+	{
+		int			ssl_min_ver = ssl_protocol_version_to_nss(conn->ssl_min_protocol_version);
+
+		if (ssl_min_ver == -1)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("invalid value \"%s\" for minimum version of SSL protocol\n"),
+							  conn->ssl_min_protocol_version);
+			return -1;
+		}
+
+		desired_range.min = ssl_min_ver;
+	}
+
+	if (conn->ssl_max_protocol_version && strlen(conn->ssl_max_protocol_version) > 0)
+	{
+		int			ssl_max_ver = ssl_protocol_version_to_nss(conn->ssl_max_protocol_version);
+
+		if (ssl_max_ver == -1)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("invalid value \"%s\" for maximum version of SSL protocol\n"),
+							  conn->ssl_max_protocol_version);
+			return -1;
+		}
+
+		desired_range.max = ssl_max_ver;
+	}
+
+	if (SSL_VersionRangeSet(model, &desired_range) != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to set allowed SSL protocol version range: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * Set up callback for verifying server certificates, as well as for how
+	 * to handle failed verifications.
+	 */
+	SSL_AuthCertificateHook(model, pg_cert_auth_handler, (void *) conn);
+	SSL_BadCertHook(model, pg_bad_cert_handler, (void *) conn);
+
+	/*
+	 * Convert the NSPR socket to an SSL socket. Ensuring the success of this
+	 * operation is critical as NSS SSL_* functions may return SECSuccess on
+	 * the socket even though SSL hasn't been enabled, which introduce a risk
+	 * of silent downgrades.
+	 */
+	conn->pr_fd = SSL_ImportFD(model, pr_fd);
+	if (!conn->pr_fd)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to configure client for TLS: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * The model can now we closed as we've applied the settings of the model
+	 * onto the real socket. From hereon we should only use conn->pr_fd.
+	 */
+	PR_Close(model);
+
+	/* Set the private data to be passed to the password callback */
+	SSL_SetPKCS11PinArg(conn->pr_fd, (void *) conn);
+
+	/*
+	 * If a CRL file has been specified, verify if it exists in the database
+	 * but don't fail in case it doesn't.
+	 */
+	if (conn->sslcrl && strlen(conn->sslcrl) > 0)
+	{
+		/* XXX: Implement me.. */
+	}
+
+	status = SSL_ResetHandshake(conn->pr_fd, PR_FALSE);
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to initiate handshake: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * Set callback for client authentication when requested by the server.
+	 */
+	SSL_GetClientAuthDataHook(conn->pr_fd, pg_client_auth_handler, (void *) conn);
+
+	/*
+	 * Specify which hostname we are expecting to talk to. This is required,
+	 * albeit mostly applies to when opening a connection to a traditional
+	 * http server it seems.
+	 */
+	SSL_SetURL(conn->pr_fd, (conn->connhost[conn->whichhost]).host);
+
+	do
+	{
+		status = SSL_ForceHandshake(conn->pr_fd);
+	}
+	while (status != SECSuccess && PR_GetError() == PR_WOULD_BLOCK_ERROR);
+
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("SSL error: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	conn->ssl_in_use = true;
+	return PGRES_POLLING_OK;
+}
+
+ssize_t
+pgtls_read(PGconn *conn, void *ptr, size_t len)
+{
+	PRInt32		nread;
+	PRErrorCode status;
+	int			read_errno = 0;
+
+	/*
+	 * PR_Recv blocks until there is data to read or the timeout expires. We
+	 * don't want to sit blocked here, so the timeout is turned off by using
+	 * PR_INTERVAL_NO_WAIT which means "return immediately",  Zero is returned
+	 * for closed connections, while -1 indicates an error within the ongoing
+	 * connection.
+	 */
+	nread = PR_Recv(conn->pr_fd, ptr, len, 0, PR_INTERVAL_NO_WAIT);
+
+	if (nread == 0)
+	{
+		read_errno = ECONNRESET;
+		return -1;
+	}
+
+	if (nread == -1)
+	{
+		status = PR_GetError();
+
+		switch (status)
+		{
+			case PR_WOULD_BLOCK_ERROR:
+				read_errno = EWOULDBLOCK;
+				break;
+
+				/*
+				 * The error cases for PR_Recv are not documented, but can be
+				 * reverse engineered from _MD_unix_map_default_error() in the
+				 * NSPR code, defined in pr/src/md/unix/unix_errors.c.
+				 */
+			default:
+				read_errno = ECONNRESET;
+				break;
+		}
+
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("TLS read error: %s"),
+						  pg_SSLerrmessage(status));
+	}
+
+	SOCK_ERRNO_SET(read_errno);
+	return (ssize_t) nread;
+}
+
+/*
+ * pgtls_read_pending
+ *		Check for the existence of data to be read.
+ *
+ * This is part of the PostgreSQL TLS backend API.
+ */
+bool
+pgtls_read_pending(PGconn *conn)
+{
+	unsigned char c;
+	int			n;
+
+	/*
+	 * PR_Recv peeks into the stream with the timeount turned off, to see if
+	 * there is another byte to read off the wire. There is an NSS function
+	 * SSL_DataPending() which might seem like a better fit, but it will only
+	 * check already encrypted data in the SSL buffer, not still unencrypted
+	 * data, thus it doesn't guarantee that a subsequent call to
+	 * PR_Read/PR_Recv wont block.
+	 */
+	n = PR_Recv(conn->pr_fd, &c, 1, PR_MSG_PEEK, PR_INTERVAL_NO_WAIT);
+	return (n > 0);
+}
+
+ssize_t
+pgtls_write(PGconn *conn, const void *ptr, size_t len)
+{
+	PRInt32		n;
+	PRErrorCode status;
+	int			write_errno = 0;
+
+	n = PR_Write(conn->pr_fd, ptr, len);
+
+	if (n < 0)
+	{
+		status = PR_GetError();
+
+		switch (status)
+		{
+			case PR_WOULD_BLOCK_ERROR:
+#ifdef EAGAIN
+				write_errno = EAGAIN;
+#else
+				write_errno = EINTR;
+#endif
+				break;
+
+			default:
+				printfPQExpBuffer(&conn->errorMessage,
+								  libpq_gettext("TLS write error: %s"),
+								  pg_SSLerrmessage(status));
+				write_errno = ECONNRESET;
+				break;
+		}
+	}
+
+	SOCK_ERRNO_SET(write_errno);
+	return (ssize_t) n;
+}
+
+/*
+ *	Verify that the server certificate matches the hostname we connected to.
+ *
+ * The certificate's Common Name and Subject Alternative Names are considered.
+ */
+int
+pgtls_verify_peer_name_matches_certificate_guts(PGconn *conn,
+												int *names_examined,
+												char **first_name)
+{
+	char		   *server_hostname = NULL;
+	CERTCertificate *server_cert = NULL;
+	SECStatus status = SECSuccess;
+	SECItem			altname_item;
+	PLArenaPool	   *arena = NULL;
+	CERTGeneralName *san_list;
+	CERTGeneralName *cn;
+
+	server_hostname = SSL_RevealURL(conn->pr_fd);
+	if (!server_hostname || server_hostname[0] == '\0')
+		goto done;
+
+	/*
+	 * CERT_VerifyCertName will internally perform RFC 2818 SubjectAltName
+	 * verification.
+	 */
+	server_cert = SSL_PeerCertificate(conn->pr_fd);
+	status = CERT_VerifyCertName(server_cert, server_hostname);
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to verify server hostname: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		goto done;
+	}
+
+	status = CERT_FindCertExtension(server_cert, SEC_OID_X509_SUBJECT_ALT_NAME,
+									&altname_item);
+	if (status == SECSuccess)
+	{
+		arena = PORT_NewArena(DER_DEFAULT_CHUNKSIZE);
+		if (!arena)
+		{
+			status = SECFailure;
+			goto done;
+		}
+		san_list = CERT_DecodeAltNameExtension(arena, &altname_item);
+		if (!san_list)
+		{
+			status = SECFailure;
+			goto done;
+		}
+
+		for (cn = san_list; cn != san_list; cn = CERT_GetNextGeneralName(cn))
+		{
+			char	   *alt_name;
+			int			rv;
+			char		tmp[512];
+
+			status = CERT_RFC1485_EscapeAndQuote(tmp, sizeof(tmp),
+												 (char *) cn->name.other.data,
+												 cn->name.other.len);
+
+			if (status != SECSuccess)
+				goto done;
+
+			rv = pq_verify_peer_name_matches_certificate_name(conn, tmp,
+															  strlen(tmp),
+															  &alt_name);
+			if (alt_name)
+			{
+				if (!*first_name)
+					*first_name = alt_name;
+				else
+					free(alt_name);
+			}
+
+			if (rv == 1)
+				status = SECSuccess;
+			else
+			{
+				status = SECFailure;
+				break;
+			}
+		}
+	}
+	else if (PORT_GetError() == SEC_ERROR_EXTENSION_NOT_FOUND)
+		status = SECSuccess;
+	else
+		status = SECSuccess;
+
+done:
+	/* san_list will be freed by freeing the arena it was allocated in */
+	if (arena)
+		PORT_FreeArena(arena, PR_TRUE);
+	PR_Free(server_hostname);
+
+	if (status == SECSuccess)
+		return 1;
+
+	return 0;
+}
+
+/* ------------------------------------------------------------ */
+/*			PostgreSQL specific TLS support functions			*/
+/* ------------------------------------------------------------ */
+
+static const char *
+pg_SSLerrmessage(PRErrorCode errcode)
+{
+	const char *error;
+
+	error = PR_ErrorToName(errcode);
+	if (error)
+		return error;
+
+	return "unknown TLS error";
+}
+
+static SECStatus
+pg_load_nss_module(SECMODModule * *module, const char *library, const char *name)
+{
+	SECMODModule *mod;
+	char	   *modulespec;
+
+	modulespec = psprintf("library=\"%s\", name=\"%s\"", library, name);
+
+	/*
+	 * Attempt to load the specified module. The second parameter is "parent"
+	 * which should always be NULL for application code. The third parameter
+	 * defines if loading should recurse which is only applicable when loading
+	 * a module from within another module. This hierarchy would have to be
+	 * defined in the modulespec, and since we don't support anything but
+	 * directly addressed modules we should pass PR_FALSE.
+	 */
+	mod = SECMOD_LoadUserModule(modulespec, NULL, PR_FALSE);
+	pfree(modulespec);
+
+	if (mod && mod->loaded)
+	{
+		*module = mod;
+		return SECSuccess;
+	}
+
+	SECMOD_DestroyModule(mod);
+	return SECFailure;
+}
+
+/* ------------------------------------------------------------ */
+/*						NSS Callbacks							*/
+/* ------------------------------------------------------------ */
+
+/*
+ * pg_cert_auth_handler
+ *			Callback for authenticating server certificate
+ *
+ * This is pretty much the same procedure as the SSL_AuthCertificate function
+ * provided by NSS, with the difference being server hostname validation. With
+ * SSL_AuthCertificate there is no way to do verify-ca, it only does the -full
+ * flavor of our sslmodes, so we need our own implementation.
+ */
+static SECStatus
+pg_cert_auth_handler(void *arg, PRFileDesc *fd, PRBool checksig, PRBool isServer)
+{
+	SECStatus	status;
+	PGconn	   *conn = (PGconn *) arg;
+	CERTCertificate *server_cert;
+	void	   *pin;
+
+	Assert(!isServer);
+
+	pin = SSL_RevealPinArg(conn->pr_fd);
+	server_cert = SSL_PeerCertificate(conn->pr_fd);
+
+	status = CERT_VerifyCertificateNow((CERTCertDBHandle *) CERT_GetDefaultCertDB(),
+									   server_cert,
+									   checksig,
+									   certificateUsageSSLServer,
+									   pin,
+									   NULL);
+
+	/*
+	 * If we've already failed validation then there is no point in also
+	 * performing the hostname check for verify-full.
+	 */
+	if (status == SECSuccess)
+	{
+		if (!pq_verify_peer_name_matches_certificate(conn))
+			status = SECFailure;
+	}
+	else
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to verify certificate: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+	}
+
+	return status;
+}
+
+/*
+ * pg_client_auth_handler
+ *		Callback for client certificate validation
+ *
+ * The client auth callback is not on by default in NSS, so we need to invoke
+ * it ourselves to ensure we can do cert authentication. A TODO is to support
+ * running without a specified sslcert parameter. By retrieving all the certs
+ * via nickname from the cert database and see if we find one which apply with
+ * NSS_CmpCertChainWCANames() and PK11_FindKeyByAnyCert() we could support
+ * just running with a ssl database specified.
+ *
+ * For now, we use the default client certificate validation which requires a
+ * defined nickname to identify the cert in the database.
+ */
+static SECStatus
+pg_client_auth_handler(void *arg, PRFileDesc * socket, CERTDistNames * caNames,
+					   CERTCertificate * *pRetCert, SECKEYPrivateKey * *pRetKey)
+{
+	PGconn	   *conn = (PGconn *) arg;
+
+	return NSS_GetClientAuthData(conn->sslcert, socket, caNames, pRetCert, pRetKey);
+}
+
+/*
+ * pg_bad_cert_handler
+ *		Callback for failed certificate validation
+ *
+ * The TLS handshake will call this function iff the server certificate failed
+ * validation. Depending on the sslmode, we allow the connection anyways.
+ */
+static SECStatus
+pg_bad_cert_handler(void *arg, PRFileDesc * fd)
+{
+	PGconn	   *conn = (PGconn *) arg;
+	PRErrorCode err;
+
+	/*
+	 * This really shouldn't happen, as we've the the PGconn object as our
+	 * callback data, and at the callsite we know it will be populated. That
+	 * being said, the NSS code itself performs this check even when it should
+	 * not be required so let's use the same belts with our suspenders.
+	 */
+	if (!arg)
+		return SECFailure;
+
+	/*
+	 * For sslmodes other than verify-full and verify-ca we don't perform peer
+	 * validation, so return immediately.  sslmode require with a database
+	 * specified which contains a CA certificate will work like verify-ca to
+	 * be compatible with the OpenSSL implementation.
+	 */
+	if (strcmp(conn->sslmode, "require") == 0)
+	{
+		if (conn->cert_database && strlen(conn->cert_database) > 0 && cert_database_has_CA(conn))
+			return SECFailure;
+	}
+	if (conn->sslmode[0] == 'v')
+		return SECFailure;
+
+	err = PORT_GetError();
+
+	/*
+	 * TODO: these are relevant error codes that can occur in certificate
+	 * validation, figure out which we dont want for require/prefer etc.
+	 */
+	switch (err)
+	{
+		case SEC_ERROR_INVALID_AVA:
+		case SEC_ERROR_INVALID_TIME:
+		case SEC_ERROR_BAD_SIGNATURE:
+		case SEC_ERROR_EXPIRED_CERTIFICATE:
+		case SEC_ERROR_UNKNOWN_ISSUER:
+		case SEC_ERROR_UNTRUSTED_ISSUER:
+		case SEC_ERROR_UNTRUSTED_CERT:
+		case SEC_ERROR_CERT_VALID:
+		case SEC_ERROR_EXPIRED_ISSUER_CERTIFICATE:
+		case SEC_ERROR_CRL_EXPIRED:
+		case SEC_ERROR_CRL_BAD_SIGNATURE:
+		case SEC_ERROR_EXTENSION_VALUE_INVALID:
+		case SEC_ERROR_CA_CERT_INVALID:
+		case SEC_ERROR_CERT_USAGES_INVALID:
+		case SEC_ERROR_UNKNOWN_CRITICAL_EXTENSION:
+			return SECSuccess;
+			break;
+		default:
+			return SECFailure;
+			break;
+	}
+
+	/* Unreachable */
+	return SECSuccess;
+}
+
+/* ------------------------------------------------------------ */
+/*					SSL information functions					*/
+/* ------------------------------------------------------------ */
+
+/*
+ * PQgetssl
+ *
+ * Return NULL as this is legacy and defined to always be equal to calling
+ * PQsslStruct(conn, "OpenSSL"); This should ideally trigger a logged warning
+ * somewhere as it's nonsensical to run in a non-OpenSSL build, but the color
+ * of said bikeshed hasn't yet been determined.
+ */
+void *
+PQgetssl(PGconn *conn)
+{
+	return NULL;
+}
+
+void *
+PQsslStruct(PGconn *conn, const char *struct_name)
+{
+	if (!conn)
+		return NULL;
+
+	/*
+	 * Return the underlying PRFileDesc which can be used to access
+	 * information on the connection details. There is no SSL context per se.
+	 */
+	if (strcmp(struct_name, "NSS") == 0)
+		return conn->pr_fd;
+	return NULL;
+}
+
+const char *const *
+PQsslAttributeNames(PGconn *conn)
+{
+	static const char *const result[] = {
+		"library",
+		"cipher",
+		"protocol",
+		"key_bits",
+		"compression",
+		NULL
+	};
+
+	return result;
+}
+
+const char *
+PQsslAttribute(PGconn *conn, const char *attribute_name)
+{
+	SECStatus	status;
+	SSLChannelInfo channel;
+	SSLCipherSuiteInfo suite;
+
+	if (!conn || !conn->pr_fd)
+		return NULL;
+
+	if (strcmp(attribute_name, "library") == 0)
+		return "NSS";
+
+	status = SSL_GetChannelInfo(conn->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+		return NULL;
+
+	status = SSL_GetCipherSuiteInfo(channel.cipherSuite, &suite, sizeof(suite));
+	if (status != SECSuccess)
+		return NULL;
+
+	if (strcmp(attribute_name, "cipher") == 0)
+		return suite.cipherSuiteName;
+
+	if (strcmp(attribute_name, "key_bits") == 0)
+	{
+		static char key_bits_str[8];
+
+		snprintf(key_bits_str, sizeof(key_bits_str), "%i", suite.effectiveKeyBits);
+		return key_bits_str;
+	}
+
+	if (strcmp(attribute_name, "protocol") == 0)
+	{
+		switch (channel.protocolVersion)
+		{
+#ifdef SSL_LIBRARY_VERSION_TLS_1_3
+			case SSL_LIBRARY_VERSION_TLS_1_3:
+				return "TLSv1.3";
+#endif
+#ifdef SSL_LIBRARY_VERSION_TLS_1_2
+			case SSL_LIBRARY_VERSION_TLS_1_2:
+				return "TLSv1.2";
+#endif
+#ifdef SSL_LIBRARY_VERSION_TLS_1_1
+			case SSL_LIBRARY_VERSION_TLS_1_1:
+				return "TLSv1.1";
+#endif
+			case SSL_LIBRARY_VERSION_TLS_1_0:
+				return "TLSv1.0";
+			default:
+				return "unknown";
+		}
+	}
+
+	/*
+	 * NSS disabled support for compression in version 3.33, and it was only
+	 * available for SSLv3 at that point anyways, so we can safely return off
+	 * here without checking.
+	 */
+	if (strcmp(attribute_name, "compression") == 0)
+		return "off";
+
+	return NULL;
+}
+
+static int
+ssl_protocol_version_to_nss(const char *protocol)
+{
+	if (pg_strcasecmp("TLSv1", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_0;
+
+#ifdef SSL_LIBRARY_VERSION_TLS_1_1
+	if (pg_strcasecmp("TLSv1.1", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_1;
+#endif
+
+#ifdef SSL_LIBRARY_VERSION_TLS_1_2
+	if (pg_strcasecmp("TLSv1.2", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_2;
+#endif
+
+#ifdef SSL_LIBRARY_VERSION_TLS_1_3
+	if (pg_strcasecmp("TLSv1.3", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_3;
+#endif
+
+	return -1;
+}
+
+static bool
+cert_database_has_CA(PGconn *conn)
+{
+	CERTCertList *certificates;
+	bool		hasCA;
+
+	/*
+	 * If the certificate database has a password we must provide it, since
+	 * this API doesn't invoke the standard password callback.
+	 */
+	if (has_password)
+		certificates = PK11_ListCerts(PK11CertListCA, PQssl_passwd_cb(NULL, PR_FALSE, (void *) conn));
+	else
+		certificates = PK11_ListCerts(PK11CertListCA, NULL);
+	hasCA = !CERT_LIST_EMPTY(certificates);
+	CERT_DestroyCertList(certificates);
+
+	return hasCA;
+}
+
+PQsslKeyPassHook_nss_type
+PQgetSSLKeyPassHook_nss(void)
+{
+	return PQsslKeyPassHook;
+}
+
+void
+PQsetSSLKeyPassHook_nss(PQsslKeyPassHook_nss_type hook)
+{
+	PQsslKeyPassHook = hook;
+}
+
+/*
+ * Supply a password to decrypt a client certificate.
+ *
+ * This must match NSS type PK11PasswordFunc.
+ */
+static char *
+PQssl_passwd_cb(PK11SlotInfo * slot, PRBool retry, void *arg)
+{
+	has_password = true;
+
+	if (PQsslKeyPassHook)
+		return PQsslKeyPassHook(slot, (PRBool) retry, arg);
+	else
+		return PQdefaultSSLKeyPassHook_nss(slot, retry, arg);
+}
+
+/*
+ * The default password handler callback.
+ */
+char *
+PQdefaultSSLKeyPassHook_nss(PK11SlotInfo * slot, PRBool retry, void *arg)
+{
+	PGconn	   *conn = (PGconn *) arg;
+
+	/*
+	 * If the password didn't work the first time there is no point in
+	 * retrying as it hasn't changed.
+	 */
+	if (retry != PR_TRUE && conn->sslpassword && strlen(conn->sslpassword) > 0)
+		return PORT_Strdup(conn->sslpassword);
+
+	return NULL;
+}
diff --git a/src/interfaces/libpq/fe-secure.c b/src/interfaces/libpq/fe-secure.c
index 97c3805303..dd6ee15c5a 100644
--- a/src/interfaces/libpq/fe-secure.c
+++ b/src/interfaces/libpq/fe-secure.c
@@ -427,6 +427,9 @@ PQsslAttributeNames(PGconn *conn)
 
 	return result;
 }
+#endif /* USE_SSL */
+
+#ifndef USE_OPENSSL
 
 PQsslKeyPassHook_OpenSSL_type
 PQgetSSLKeyPassHook_OpenSSL(void)
@@ -445,7 +448,7 @@ PQdefaultSSLKeyPassHook_OpenSSL(char *buf, int size, PGconn *conn)
 {
 	return 0;
 }
-#endif							/* USE_SSL */
+#endif							/* USE_OPENSSL */
 
 /* Dummy version of GSSAPI information functions, when built without GSS support */
 #ifndef ENABLE_GSS
diff --git a/src/interfaces/libpq/libpq-fe.h b/src/interfaces/libpq/libpq-fe.h
index 3b6a9fbce3..27c16e187f 100644
--- a/src/interfaces/libpq/libpq-fe.h
+++ b/src/interfaces/libpq/libpq-fe.h
@@ -625,6 +625,17 @@ extern PQsslKeyPassHook_OpenSSL_type PQgetSSLKeyPassHook_OpenSSL(void);
 extern void PQsetSSLKeyPassHook_OpenSSL(PQsslKeyPassHook_OpenSSL_type hook);
 extern int	PQdefaultSSLKeyPassHook_OpenSSL(char *buf, int size, PGconn *conn);
 
+/* == in fe-secure-nss.c === */
+typedef struct PK11SlotInfoStr PK11SlotInfo;
+typedef int PRIntn;
+typedef PRIntn PRBool;
+
+/* Support for overriding sslpassword handling with a callback. */
+typedef char *(*PQsslKeyPassHook_nss_type) (PK11SlotInfo * slot, PRBool retry, void *arg);
+extern PQsslKeyPassHook_nss_type PQgetSSLKeyPassHook_nss(void);
+extern void PQsetSSLKeyPassHook_nss(PQsslKeyPassHook_nss_type hook);
+extern char *PQdefaultSSLKeyPassHook_nss(PK11SlotInfo * slot, PRBool retry, void *arg);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/src/interfaces/libpq/libpq-int.h b/src/interfaces/libpq/libpq-int.h
index 1de91ae295..49a22f6c7d 100644
--- a/src/interfaces/libpq/libpq-int.h
+++ b/src/interfaces/libpq/libpq-int.h
@@ -362,6 +362,7 @@ struct pg_conn
 	char	   *sslpassword;	/* client key file password */
 	char	   *sslrootcert;	/* root certificate filename */
 	char	   *sslcrl;			/* certificate revocation list filename */
+	char	   *cert_database;	/* NSS certificate/key database */
 	char	   *requirepeer;	/* required peer credentials for local sockets */
 	char	   *gssencmode;		/* GSS mode (require,prefer,disable) */
 	char	   *krbsrvname;		/* Kerberos service name */
@@ -485,6 +486,10 @@ struct pg_conn
 								 * OpenSSL version changes */
 #endif
 #endif							/* USE_OPENSSL */
+
+#ifdef USE_NSS
+	void	   *pr_fd;
+#endif							/* USE_NSS */
 #endif							/* USE_SSL */
 
 #ifdef ENABLE_GSS
diff --git a/src/tools/msvc/Mkvcbuild.pm b/src/tools/msvc/Mkvcbuild.pm
index 90594bd41b..29879b51af 100644
--- a/src/tools/msvc/Mkvcbuild.pm
+++ b/src/tools/msvc/Mkvcbuild.pm
@@ -192,12 +192,19 @@ sub mkvcbuild
 	$postgres->FullExportDLL('postgres.lib');
 
 	# The OBJS scraper doesn't know about ifdefs, so remove appropriate files
-	# if building without OpenSSL.
-	if (!$solution->{options}->{openssl})
+	# if building without various options.
+	if (!$solution->{options}->{openssl} && !$solution->{options}->{nss})
 	{
 		$postgres->RemoveFile('src/backend/libpq/be-secure-common.c');
+	}
+	if (!$solution->{options}->{openssl})
+	{
 		$postgres->RemoveFile('src/backend/libpq/be-secure-openssl.c');
 	}
+	if (!$solution->{options}->{nss})
+	{
+		$postgres->RemoveFile('src/backend/libpq/be-secure-nss.c');
+	}
 	if (!$solution->{options}->{gss})
 	{
 		$postgres->RemoveFile('src/backend/libpq/be-gssapi-common.c');
@@ -255,12 +262,19 @@ sub mkvcbuild
 	$libpq->AddReference($libpgcommon, $libpgport);
 
 	# The OBJS scraper doesn't know about ifdefs, so remove appropriate files
-	# if building without OpenSSL.
-	if (!$solution->{options}->{openssl})
+	# if building without various options
+	if (!$solution->{options}->{openssl} && !$solution->{options}->{nss})
 	{
 		$libpq->RemoveFile('src/interfaces/libpq/fe-secure-common.c');
+	}
+	if (!$solution->{options}->{openssl})
+	{
 		$libpq->RemoveFile('src/interfaces/libpq/fe-secure-openssl.c');
 	}
+	if (!$solution->{options}->{nss})
+	{
+		$libpq->RemoveFile('src/interfaces/libpq/fe-secure-nss.c');
+	}
 	if (!$solution->{options}->{gss})
 	{
 		$libpq->RemoveFile('src/interfaces/libpq/fe-gssapi-common.c');
diff --git a/src/tools/msvc/Solution.pm b/src/tools/msvc/Solution.pm
index bc8904732f..ac11d9ab26 100644
--- a/src/tools/msvc/Solution.pm
+++ b/src/tools/msvc/Solution.pm
@@ -484,6 +484,7 @@ sub GenerateFiles
 		USE_NAMED_POSIX_SEMAPHORES => undef,
 		USE_OPENSSL                => undef,
 		USE_OPENSSL_RANDOM         => undef,
+		USE_NSS                    => undef,
 		USE_PAM                    => undef,
 		USE_SLICING_BY_8_CRC32C    => undef,
 		USE_SSE42_CRC32C           => undef,
@@ -537,6 +538,10 @@ sub GenerateFiles
 			$define{HAVE_OPENSSL_INIT_SSL}      = 1;
 		}
 	}
+	if ($self->{options}->{nss})
+	{
+		$define{USE_NSS} = 1;
+	}
 
 	$self->GenerateConfigHeader('src/include/pg_config.h',     \%define, 1);
 	$self->GenerateConfigHeader('src/include/pg_config_ext.h', \%define, 0);
@@ -1004,6 +1009,21 @@ sub AddProject
 			}
 		}
 	}
+	if ($self->{options}->{nss})
+	{
+		$proj->AddIncludeDir($self->{options}->{nss} . '\..\public\nss');
+		$proj->AddIncludeDir($self->{options}->{nss} . '\include\nspr');
+		foreach my $lib (qw(plds4 plc4 nspr4))
+		{
+			$proj->AddLibrary($self->{options}->{nss} .
+							  '\lib\lib' . "$lib.lib", 0);
+		}
+		foreach my $lib (qw(ssl3 smime3 nss3))
+		{
+			$proj->AddLibrary($self->{options}->{nss} .
+							  '\lib' . "\\$lib.dll.lib", 0);
+		}
+	}
 	if ($self->{options}->{nls})
 	{
 		$proj->AddIncludeDir($self->{options}->{nls} . '\include');
diff --git a/src/tools/msvc/config_default.pl b/src/tools/msvc/config_default.pl
index 2ef2cfc4e9..49dc4d5864 100644
--- a/src/tools/msvc/config_default.pl
+++ b/src/tools/msvc/config_default.pl
@@ -17,6 +17,7 @@ our $config = {
 	perl      => undef,    # --with-perl=<path>
 	python    => undef,    # --with-python=<path>
 	openssl   => undef,    # --with-openssl=<path>
+	nss       => undef,    # --with-nss=<path>
 	uuid      => undef,    # --with-uuid=<path>
 	xml       => undef,    # --with-libxml=<path>
 	xslt      => undef,    # --with-libxslt=<path>
-- 
2.21.1 (Apple Git-122.3)

From 3275f494a8c6669e4e8223ae84c0f06176c632c6 Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Wed, 28 Oct 2020 11:22:26 +0100
Subject: [PATCH v14 2/6] NSS Testharness updates

---
 src/test/Makefile                             |   2 +-
 src/test/ssl/Makefile                         | 176 ++++++++++
 src/test/ssl/t/001_ssltests.pl                | 326 ++++++++++--------
 src/test/ssl/t/002_scram.pl                   |   4 +-
 src/test/ssl/t/SSL/Backend/NSS.pm             |  64 ++++
 src/test/ssl/t/SSL/Backend/OpenSSL.pm         | 103 ++++++
 .../ssl/t/{SSLServer.pm => SSL/Server.pm}     |  80 ++++-
 7 files changed, 602 insertions(+), 153 deletions(-)
 create mode 100644 src/test/ssl/t/SSL/Backend/NSS.pm
 create mode 100644 src/test/ssl/t/SSL/Backend/OpenSSL.pm
 rename src/test/ssl/t/{SSLServer.pm => SSL/Server.pm} (78%)

diff --git a/src/test/Makefile b/src/test/Makefile
index 9774f534d9..a09c350939 100644
--- a/src/test/Makefile
+++ b/src/test/Makefile
@@ -27,7 +27,7 @@ ifneq (,$(filter ldap,$(PG_TEST_EXTRA)))
 SUBDIRS += ldap
 endif
 endif
-ifeq ($(with_openssl),yes)
+ifeq ($(with_ssl),yes)
 ifneq (,$(filter ssl,$(PG_TEST_EXTRA)))
 SUBDIRS += ssl
 endif
diff --git a/src/test/ssl/Makefile b/src/test/ssl/Makefile
index 777ee39413..4af971ef77 100644
--- a/src/test/ssl/Makefile
+++ b/src/test/ssl/Makefile
@@ -14,6 +14,7 @@ top_builddir = ../../..
 include $(top_builddir)/src/Makefile.global
 
 export with_openssl
+export with_nss
 
 CERTIFICATES := server_ca server-cn-and-alt-names \
 	server-cn-only server-single-alt-name server-multiple-alt-names \
@@ -30,6 +31,32 @@ SSLFILES := $(CERTIFICATES:%=ssl/%.key) $(CERTIFICATES:%=ssl/%.crt) \
 	ssl/client+client_ca.crt ssl/client-der.key \
 	ssl/client-encrypted-pem.key ssl/client-encrypted-der.key
 
+# Even though we in practice could get away with far fewer NSS databases, they
+# are generated to mimick the setup for the OpenSSL tests in order to ensure
+# we isolate the same behavior between the backends. The database name should
+# contain the files included for easier test suite code reading.
+NSSFILES := ssl/nss/client_ca.crt.db \
+	ssl/nss/server_ca.crt.db \
+	ssl/nss/root+server_ca.crt.db \
+	ssl/nss/root+client_ca.crt.db \
+	ssl/nss/client.crt__client.key.db \
+	ssl/nss/client-revoked.crt__client-revoked.key.db \
+	ssl/nss/server-cn-only.crt__server-password.key.db \
+	ssl/nss/server-cn-only.crt__server-cn-only.key.db \
+	ssl/nss/root.crl \
+	ssl/nss/server.crl \
+	ssl/nss/client.crl \
+	ssl/nss/server-multiple-alt-names.crt__server-multiple-alt-names.key.db \
+	ssl/nss/server-single-alt-name.crt__server-single-alt-name.key.db \
+	ssl/nss/server-cn-and-alt-names.crt__server-cn-and-alt-names.key.db \
+	ssl/nss/server-no-names.crt__server-no-names.key.db \
+	ssl/nss/server-revoked.crt__server-revoked.key.db \
+	ssl/nss/root+client.crl \
+	ssl/nss/client+client_ca.crt__client.key.db \
+	ssl/nss/client.crt__client-encrypted-pem.key.db \
+	ssl/nss/root+server_ca.crt__server.crl.db \
+	ssl/nss/root+server_ca.crt__root+server.crl.db
+
 # This target re-generates all the key and certificate files. Usually we just
 # use the ones that are committed to the tree without rebuilding them.
 #
@@ -37,6 +64,10 @@ SSLFILES := $(CERTIFICATES:%=ssl/%.key) $(CERTIFICATES:%=ssl/%.crt) \
 #
 sslfiles: $(SSLFILES)
 
+# Generate NSS certificate databases corresponding to the OpenSSL certificates.
+# This target will fail unless preceded by nssfiles-clean.
+nssfiles: $(NSSFILES)
+
 # OpenSSL requires a directory to put all generated certificates in. We don't
 # use this for anything, but we need a location.
 ssl/new_certs_dir:
@@ -64,6 +95,24 @@ ssl/%_ca.crt: ssl/%_ca.key %_ca.config ssl/root_ca.crt ssl/new_certs_dir
 	rm ssl/temp_ca.crt ssl/temp_ca_signed.crt
 	echo "01" > ssl/$*_ca.srl
 
+ssl/nss/%_ca.crt.db: ssl/%_ca.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n $*_ca.crt -i ssl/$*_ca.crt -t "CT,C,C"
+
+ssl/nss/root+server_ca.crt__server.crl.db: ssl/root+server_ca.crt ssl/nss/server.crl
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	crlutil -I -i ssl/nss/server.crl -d $@ -B
+
+ssl/nss/root+server_ca.crt__root+server.crl.db: ssl/root+server_ca.crt ssl/nss/root.crl ssl/nss/server.crl
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	crlutil -I -i ssl/nss/root.crl -d $@ -B
+	crlutil -I -i ssl/nss/server.crl -d $@ -B
+
 # Server certificates, signed by server CA:
 ssl/server-%.crt: ssl/server-%.key ssl/server_ca.crt server-%.config
 	openssl req -new -key ssl/server-$*.key -out ssl/server-$*.csr -config server-$*.config
@@ -77,6 +126,78 @@ ssl/server-ss.crt: ssl/server-cn-only.key ssl/server-cn-only.crt server-cn-only.
 	openssl x509 -req -days 10000 -in ssl/server-ss.csr -signkey ssl/server-cn-only.key -out ssl/server-ss.crt  -extensions v3_req -extfile server-cn-only.config
 	rm ssl/server-ss.csr
 
+# pk12util won't preserve the password when importing the password protected
+# key, the password must be set on the database *before* importing it as the
+# password in the pkcs12 envelope will be dropped.
+ssl/nss/server-cn-only.crt__server-password.key.db: ssl/server-cn-only.crt
+	$(MKDIR_P) $@
+	echo "secret1" > password.txt
+	certutil -d "sql:$@" -N -f password.txt
+	certutil -d "sql:$@" -A -n ssl/server-cn-only.crt -i ssl/server-cn-only.crt -t "CT,C,C" -f password.txt
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C" -f password.txt
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C" -f password.txt
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C" -f password.txt
+	openssl pkcs12 -export -out ssl/nss/server-password.pfx -inkey ssl/server-password.key -in ssl/server-cn-only.crt -certfile ssl/server_ca.crt -passin 'pass:secret1' -passout 'pass:secret1'
+	pk12util -i ssl/nss/server-password.pfx -d $@ -W 'secret1' -K 'secret1'
+
+ssl/nss/server-cn-only.crt__server-cn-only.key.db: ssl/server-cn-only.crt ssl/server-cn-only.key
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-cn-only.crt -i ssl/server-cn-only.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-cn-only.pfx -inkey ssl/server-cn-only.key -in ssl/server-cn-only.crt -certfile ssl/server_ca.crt -passout pass:
+	pk12util -i ssl/nss/server-cn-only.pfx -d $@ -W ''
+
+ssl/nss/server-multiple-alt-names.crt__server-multiple-alt-names.key.db: ssl/server-multiple-alt-names.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-multiple-alt-names.crt -i ssl/server-multiple-alt-names.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-multiple-alt-names.pfx -inkey ssl/server-multiple-alt-names.key -in ssl/server-multiple-alt-names.crt -certfile ssl/server-multiple-alt-names.crt -passout pass:
+	pk12util -i ssl/nss/server-multiple-alt-names.pfx -d $@ -W ''
+
+ssl/nss/server-single-alt-name.crt__server-single-alt-name.key.db: ssl/server-single-alt-name.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-single-alt-name.crt -i ssl/server-single-alt-name.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-single-alt-name.pfx -inkey ssl/server-single-alt-name.key -in ssl/server-single-alt-name.crt -certfile ssl/server-single-alt-name.crt -passout pass:
+	pk12util -i ssl/nss/server-single-alt-name.pfx -d $@ -W ''
+
+ssl/nss/server-cn-and-alt-names.crt__server-cn-and-alt-names.key.db: ssl/server-cn-and-alt-names.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-cn-and-alt-names.crt -i ssl/server-cn-and-alt-names.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-cn-and-alt-names.pfx -inkey ssl/server-cn-and-alt-names.key -in ssl/server-cn-and-alt-names.crt -certfile ssl/server-cn-and-alt-names.crt -passout pass:
+	pk12util -i ssl/nss/server-cn-and-alt-names.pfx -d $@ -W ''
+
+ssl/nss/server-no-names.crt__server-no-names.key.db: ssl/server-no-names.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-no-names.crt -i ssl/server-no-names.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-no-names.pfx -inkey ssl/server-no-names.key -in ssl/server-no-names.crt -certfile ssl/server-no-names.crt -passout pass:
+	pk12util -i ssl/nss/server-no-names.pfx -d $@ -W ''
+
+ssl/nss/server-revoked.crt__server-revoked.key.db: ssl/server-revoked.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-revoked.crt -i ssl/server-revoked.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-revoked.pfx -inkey ssl/server-revoked.key -in ssl/server-revoked.crt -certfile ssl/server-revoked.crt -passout pass:
+	pk12util -i ssl/nss/server-revoked.pfx -d $@ -W ''
+
 # Password-protected version of server-cn-only.key
 ssl/server-password.key: ssl/server-cn-only.key
 	openssl rsa -aes256 -in $< -out $@ -passout 'pass:secret1'
@@ -88,6 +209,27 @@ ssl/client.crt: ssl/client.key ssl/client_ca.crt
 	openssl x509 -in ssl/temp.crt -out ssl/client.crt # to keep just the PEM cert
 	rm ssl/client.csr ssl/temp.crt
 
+# Client certificate, signed by client CA
+ssl/nss/client.crt__client.key.db: ssl/client.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/client.crt -i ssl/client.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root+client_ca.crt -i ssl/root+client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client.pfx -inkey ssl/client.key -in ssl/client.crt -certfile ssl/client_ca.crt -passout pass:
+	pk12util -i ssl/nss/client.pfx -d $@ -W ''
+
+# Client certificate with encrypted key, signed by client CA
+ssl/nss/client.crt__client-encrypted-pem.key.db: ssl/client.crt
+	$(MKDIR_P) $@
+	echo 'dUmmyP^#+' > $@.pass
+	certutil -d "sql:$@" -N -f $@.pass
+	certutil -d "sql:$@" -A -f $@.pass -n ssl/client.crt -i ssl/client.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -f $@.pass -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -f $@.pass -n root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client-encrypted-pem.pfx -inkey ssl/client-encrypted-pem.key -in ssl/client.crt -certfile ssl/client_ca.crt -passin pass:'dUmmyP^#+' -passout pass:'dUmmyP^#+'
+	pk12util -i ssl/nss/client-encrypted-pem.pfx -d $@ -W 'dUmmyP^#+' -k $@.pass
+
 # Another client certificate, signed by the client CA. This one is revoked.
 ssl/client-revoked.crt: ssl/client-revoked.key ssl/client_ca.crt client.config
 	openssl req -new -key ssl/client-revoked.key -out ssl/client-revoked.csr -config client.config
@@ -95,6 +237,14 @@ ssl/client-revoked.crt: ssl/client-revoked.key ssl/client_ca.crt client.config
 	openssl x509 -in ssl/temp.crt -out ssl/client-revoked.crt # to keep just the PEM cert
 	rm ssl/client-revoked.csr ssl/temp.crt
 
+ssl/nss/client-revoked.crt__client-revoked.key.db: ssl/client-revoked.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/client-revoked.crt -i ssl/client-revoked.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client-revoked.pfx -inkey ssl/client-revoked.key -in ssl/client-revoked.crt -certfile ssl/client_ca.crt -passout pass:
+	pk12util -i ssl/nss/client-revoked.pfx -d $@ -W ''
+
 # Convert the key to DER, to test our behaviour there too
 ssl/client-der.key: ssl/client.key
 	openssl rsa -in ssl/client.key -outform DER -out ssl/client-der.key
@@ -127,19 +277,40 @@ ssl/root+client_ca.crt: ssl/root_ca.crt ssl/client_ca.crt
 ssl/client+client_ca.crt: ssl/client.crt ssl/client_ca.crt
 	cat $^ > $@
 
+# Client certificate, signed by client CA
+ssl/nss/client+client_ca.crt__client.key.db: ssl/client+client_ca.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/client+client_ca.crt -i ssl/client+client_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n ssl/root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client.pfx -inkey ssl/client.key -in ssl/client.crt -certfile ssl/client_ca.crt -passout pass:
+	pk12util -i ssl/nss/client.pfx -d $@ -W ''
+
 #### CRLs
 
 ssl/client.crl: ssl/client-revoked.crt
 	openssl ca -config cas.config -name client_ca -revoke ssl/client-revoked.crt
 	openssl ca -config cas.config -name client_ca -gencrl -out ssl/client.crl
 
+ssl/nss/client.crl: ssl/client.crl
+	openssl crl -in $^ -outform der -out $@
+
 ssl/server.crl: ssl/server-revoked.crt
 	openssl ca -config cas.config -name server_ca -revoke ssl/server-revoked.crt
 	openssl ca -config cas.config -name server_ca -gencrl -out ssl/server.crl
 
+ssl/nss/server.crl: ssl/server.crl
+	openssl crl -in $^ -outform der -out $@
+
 ssl/root.crl: ssl/root_ca.crt
 	openssl ca -config cas.config -name root_ca -gencrl -out ssl/root.crl
 
+ssl/nss/root.crl: ssl/root.crl
+	openssl crl -in $^ -outform der -out $@
+
+ssl/nss/root+client.crl: ssl/root+client.crl
+	openssl crl -in $^ -outform der -out $@
+
 # If a CRL is used, OpenSSL requires a CRL file for *all* the CAs in the
 # chain, even if some of them are empty.
 ssl/root+server.crl: ssl/root.crl ssl/server.crl
@@ -151,9 +322,14 @@ ssl/root+client.crl: ssl/root.crl ssl/client.crl
 sslfiles-clean:
 	rm -f $(SSLFILES) ssl/client_ca.srl ssl/server_ca.srl ssl/client_ca-certindex* ssl/server_ca-certindex* ssl/root_ca-certindex* ssl/root_ca.srl ssl/temp_ca.crt ssl/temp_ca_signed.crt
 
+.PHONY: nssfiles-clean
+nssfiles-clean:
+	rm -rf ssl/nss
+
 clean distclean maintainer-clean:
 	rm -rf tmp_check
 	rm -rf ssl/*.old ssl/new_certs_dir ssl/client*_tmp.key
+	rm -rf ssl/nss
 
 # Doesn't depend on $(SSLFILES) because we don't rebuild them by default
 check:
diff --git a/src/test/ssl/t/001_ssltests.pl b/src/test/ssl/t/001_ssltests.pl
index fd2727b568..ff9c8ae3f3 100644
--- a/src/test/ssl/t/001_ssltests.pl
+++ b/src/test/ssl/t/001_ssltests.pl
@@ -4,17 +4,24 @@ use PostgresNode;
 use TestLib;
 use Test::More;
 
-use File::Copy;
-
 use FindBin;
 use lib $FindBin::RealBin;
 
-use SSLServer;
+use SSL::Server;
+
+my $openssl;
+my $nss;
 
 if ($ENV{with_openssl} eq 'yes')
 {
+	$openssl = 1;
 	plan tests => 93;
 }
+elsif ($ENV{with_nss} eq 'yes')
+{
+	$nss = 1;
+	plan tests => 98;
+}
 else
 {
 	plan skip_all => 'SSL not supported by this build';
@@ -32,32 +39,6 @@ my $SERVERHOSTCIDR = '127.0.0.1/32';
 # Allocation of base connection string shared among multiple tests.
 my $common_connstr;
 
-# The client's private key must not be world-readable, so take a copy
-# of the key stored in the code tree and update its permissions.
-#
-# This changes ssl/client.key to ssl/client_tmp.key etc for the rest
-# of the tests.
-my @keys = (
-	"client",     "client-revoked",
-	"client-der", "client-encrypted-pem",
-	"client-encrypted-der");
-foreach my $key (@keys)
-{
-	copy("ssl/${key}.key", "ssl/${key}_tmp.key")
-	  or die
-	  "couldn't copy ssl/${key}.key to ssl/${key}_tmp.key for permissions change: $!";
-	chmod 0600, "ssl/${key}_tmp.key"
-	  or die "failed to change permissions on ssl/${key}_tmp.key: $!";
-}
-
-# Also make a copy of that explicitly world-readable.  We can't
-# necessarily rely on the file in the source tree having those
-# permissions.  Add it to @keys to include it in the final clean
-# up phase.
-copy("ssl/client.key", "ssl/client_wrongperms_tmp.key");
-chmod 0644, "ssl/client_wrongperms_tmp.key";
-push @keys, 'client_wrongperms';
-
 #### Set up the server.
 
 note "setting up data directory";
@@ -72,36 +53,65 @@ $node->start;
 
 # Run this before we lock down access below.
 my $result = $node->safe_psql('postgres', "SHOW ssl_library");
-is($result, 'OpenSSL', 'ssl_library parameter');
+is($result, SSL::Server::ssl_library(), 'ssl_library parameter');
 
 configure_test_server_for_ssl($node, $SERVERHOSTADDR, $SERVERHOSTCIDR,
 	'trust');
 
 note "testing password-protected keys";
 
-open my $sslconf, '>', $node->data_dir . "/sslconfig.conf";
-print $sslconf "ssl=on\n";
-print $sslconf "ssl_cert_file='server-cn-only.crt'\n";
-print $sslconf "ssl_key_file='server-password.key'\n";
-print $sslconf "ssl_passphrase_command='echo wrongpassword'\n";
-close $sslconf;
+# Since the passphrase callbacks operate at different stages in OpenSSL and
+# NSS we have two separate blocks for them.
+SKIP:
+{
+	skip "Certificate passphrases aren't checked on server restart in NSS", 2
+	  if ($nss);
+
+	set_server_cert($node, 'server-cn-only', 'root+client_ca',
+					   'server-password', 'echo wrongpassword');
+	command_fails(
+		[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
+		'restart fails with password-protected key file with wrong password');
+	$node->_update_pid(0);
+
+	set_server_cert($node, 'server-cn-only', 'root+client_ca',
+					'server-password', 'echo secret1');
+	command_ok(
+		[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
+		'restart succeeds with password-protected key file');
+	$node->_update_pid(1);
+}
 
-command_fails(
-	[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
-	'restart fails with password-protected key file with wrong password');
-$node->_update_pid(0);
+SKIP:
+{
+	skip "Certificate passphrases are checked on connection in NSS", 5
+	  if ($openssl);
 
-open $sslconf, '>', $node->data_dir . "/sslconfig.conf";
-print $sslconf "ssl=on\n";
-print $sslconf "ssl_cert_file='server-cn-only.crt'\n";
-print $sslconf "ssl_key_file='server-password.key'\n";
-print $sslconf "ssl_passphrase_command='echo secret1'\n";
-close $sslconf;
+	set_server_cert($node, 'server-cn-only', 'root+client_ca',
+					   'server-password', 'echo wrongpassword');
+	command_ok(
+		[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
+		'restart fails with password-protected key file with wrong password');
+	$node->_update_pid(1);
 
-command_ok(
-	[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
-	'restart succeeds with password-protected key file');
-$node->_update_pid(1);
+	test_connect_fails(
+		"user=ssltestuser dbname=trustdb sslcert=invalid hostaddr=$SERVERHOSTADDR host=common-name.pg-ssltest.test",
+		"sslrootcert=invalid sslmode=require",
+		qr/\QSSL error\E/,
+		"connect to server with incorrect key password configured");
+
+	set_server_cert($node, 'server-cn-only', 'root+client_ca',
+					   'server-password', 'echo secret1');
+	command_ok(
+		[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
+		'restart fails with password-protected key file with wrong password');
+	$node->_update_pid(1);
+
+	test_connect_ok(
+		"user=ssltestuser dbname=trustdb sslcert=invalid hostaddr=$SERVERHOSTADDR host=common-name.pg-ssltest.test",
+		"sslrootcert=invalid sslmode=require",
+		"connect to server with correct key password configured");
+}
 
 # Test compatibility of SSL protocols.
 # TLSv1.1 is lower than TLSv1.2, so it won't work.
@@ -149,82 +159,105 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"sslrootcert=invalid sslmode=verify-ca",
-	qr/root certificate file "invalid" does not exist/,
+	qr/root certificate file "invalid" does not exist|could not connect to server/,
 	"connect without server root cert sslmode=verify-ca");
 test_connect_fails(
 	$common_connstr,
 	"sslrootcert=invalid sslmode=verify-full",
-	qr/root certificate file "invalid" does not exist/,
+	qr/root certificate file "invalid" does not exist|could not connect to server/,
 	"connect without server root cert sslmode=verify-full");
 
 # Try with wrong root cert, should fail. (We're using the client CA as the
 # root, but the server's key is signed by the server CA.)
-test_connect_fails($common_connstr,
-	"sslrootcert=ssl/client_ca.crt sslmode=require",
-	qr/SSL error/, "connect with wrong server root cert sslmode=require");
-test_connect_fails($common_connstr,
-	"sslrootcert=ssl/client_ca.crt sslmode=verify-ca",
-	qr/SSL error/, "connect with wrong server root cert sslmode=verify-ca");
-test_connect_fails($common_connstr,
-	"sslrootcert=ssl/client_ca.crt sslmode=verify-full",
-	qr/SSL error/, "connect with wrong server root cert sslmode=verify-full");
-
-# Try with just the server CA's cert. This fails because the root file
-# must contain the whole chain up to the root CA.
-test_connect_fails($common_connstr,
-	"sslrootcert=ssl/server_ca.crt sslmode=verify-ca",
-	qr/SSL error/, "connect with server CA cert, without root CA");
+test_connect_fails(
+	$common_connstr,
+	"sslrootcert=ssl/client_ca.crt sslmode=require cert_database=ssl/nss/client_ca.crt.db",
+	qr/SSL error/,
+	"connect with wrong server root cert sslmode=require");
+test_connect_fails(
+	$common_connstr,
+	"sslrootcert=ssl/client_ca.crt sslmode=verify-ca cert_database=ssl/nss/client_ca.crt.db",
+	qr/SSL error/,
+	"connect with wrong server root cert sslmode=verify-ca");
+test_connect_fails(
+	$common_connstr,
+	"sslrootcert=ssl/client_ca.crt sslmode=verify-full cert_database=ssl/nss/client_ca.crt.db",
+	qr/SSL error/,
+	"connect with wrong server root cert sslmode=verify-full");
+
+SKIP:
+{
+	# NSS supports partial chain validation, so this test doesnt work there.
+	# This is similar to the OpenSSL option X509_V_FLAG_PARTIAL_CHAIN which
+	# we don't allow.
+	skip "NSS support partial chain validation", 2 if ($nss);
+	# Try with just the server CA's cert. This fails because the root file
+	# must contain the whole chain up to the root CA.
+	test_connect_fails($common_connstr,
+		"sslrootcert=ssl/server_ca.crt sslmode=verify-ca",
+		qr/SSL error/, "connect with server CA cert, without root CA");
+}
 
 # And finally, with the correct root cert.
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require cert_database=ssl/nss/root+server_ca.crt.db",
 	"connect with correct server CA cert file sslmode=require");
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca cert_database=ssl/nss/root+server_ca.crt.db",
 	"connect with correct server CA cert file sslmode=verify-ca");
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-full",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db",
 	"connect with correct server CA cert file sslmode=verify-full");
 
-# Test with cert root file that contains two certificates. The client should
-# be able to pick the right one, regardless of the order in the file.
-test_connect_ok(
-	$common_connstr,
-	"sslrootcert=ssl/both-cas-1.crt sslmode=verify-ca",
-	"cert root file that contains two certificates, order 1");
-test_connect_ok(
-	$common_connstr,
-	"sslrootcert=ssl/both-cas-2.crt sslmode=verify-ca",
-	"cert root file that contains two certificates, order 2");
+SKIP:
+{
+	skip "CA ordering is irrelevant in NSS databases", 2 if ($nss);
 
+	# Test with cert root file that contains two certificates. The client should
+	# be able to pick the right one, regardless of the order in the file.
+	test_connect_ok(
+		$common_connstr,
+		"sslrootcert=ssl/both-cas-1.crt sslmode=verify-ca",
+		"cert root file that contains two certificates, order 1");
+
+	# How about import the both-file into a database?
+	test_connect_ok(
+		$common_connstr,
+		"sslrootcert=ssl/both-cas-2.crt sslmode=verify-ca",
+		"cert root file that contains two certificates, order 2");
+}
 # CRL tests
 
 # Invalid CRL filename is the same as no CRL, succeeds
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=invalid",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=invalid cert_database=ssl/nss/root+server_ca.crt.db",
 	"sslcrl option with invalid file name");
 
-# A CRL belonging to a different CA is not accepted, fails
-test_connect_fails(
-	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/client.crl",
-	qr/SSL error/,
-	"CRL belonging to a different CA");
+SKIP:
+{
+	skip "CRL's are verified when adding to NSS database", 2 if ($nss);
+	# A CRL belonging to a different CA is not accepted, fails
+	test_connect_fails(
+		$common_connstr,
+		"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/client.crl",
+		qr/SSL error/,
+		"CRL belonging to a different CA");
+}
 
 # With the correct CRL, succeeds (this cert is not revoked)
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/root+server.crl",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/root+server.crl cert_database=ssl/nss/root+server_ca.crt__root+server.crl.db",
 	"CRL with a non-revoked cert");
 
 # Check that connecting with verify-full fails, when the hostname doesn't
 # match the hostname in the server's certificate.
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -237,14 +270,14 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"sslmode=verify-full host=wronghost.test",
-	qr/\Qserver certificate for "common-name.pg-ssltest.test" does not match host name "wronghost.test"\E/,
+	qr/\Qserver certificate for "common-name.pg-ssltest.test" does not match host name "wronghost.test"\E|SSL_ERROR_BAD_CERT_DOMAIN/,
 	"mismatch between host name and server certificate sslmode=verify-full");
 
 # Test Subject Alternative Names.
 switch_server_cert($node, 'server-multiple-alt-names');
 
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -262,12 +295,12 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"host=wronghost.alt-name.pg-ssltest.test",
-	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "wronghost.alt-name.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "wronghost.alt-name.pg-ssltest.test"\E|SSL_ERROR_BAD_CERT_DOMAIN/,
 	"host name not matching with X.509 Subject Alternative Names");
 test_connect_fails(
 	$common_connstr,
 	"host=deep.subdomain.wildcard.pg-ssltest.test",
-	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E|SSL_ERROR_BAD_CERT_DOMAIN/,
 	"host name not matching with X.509 Subject Alternative Names wildcard");
 
 # Test certificate with a single Subject Alternative Name. (this gives a
@@ -275,7 +308,7 @@ test_connect_fails(
 switch_server_cert($node, 'server-single-alt-name');
 
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -285,12 +318,12 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"host=wronghost.alt-name.pg-ssltest.test",
-	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "wronghost.alt-name.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "wronghost.alt-name.pg-ssltest.test"\E|SSL_ERROR_BAD_CERT_DOMAIN/,
 	"host name not matching with a single X.509 Subject Alternative Name");
 test_connect_fails(
 	$common_connstr,
 	"host=deep.subdomain.wildcard.pg-ssltest.test",
-	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E|SSL_ERROR_BAD_CERT_DOMAIN/,
 	"host name not matching with a single X.509 Subject Alternative Name wildcard"
 );
 
@@ -299,7 +332,7 @@ test_connect_fails(
 switch_server_cert($node, 'server-cn-and-alt-names');
 
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -312,14 +345,14 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"host=common-name.pg-ssltest.test",
-	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 1 other name) does not match host name "common-name.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 1 other name) does not match host name "common-name.pg-ssltest.test"\E|SSL_ERROR_BAD_CERT_DOMAIN/,
 	"certificate with both a CN and SANs ignores CN");
 
 # Finally, test a server certificate that has no CN or SANs. Of course, that's
 # not a very sensible certificate, but libpq should handle it gracefully.
 switch_server_cert($node, 'server-no-names');
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -328,7 +361,7 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"sslmode=verify-full host=common-name.pg-ssltest.test",
-	qr/could not get server's host name from server certificate/,
+	qr/could not get server's host name from server certificate|SSL_ERROR_BAD_CERT_DOMAIN/,
 	"server certificate without CN or SANs sslmode=verify-full");
 
 # Test that the CRL works
@@ -340,11 +373,11 @@ $common_connstr =
 # Without the CRL, succeeds. With it, fails.
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca cert_database=ssl/nss/root+server_ca.crt.db",
 	"connects without client-side CRL");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/root+server.crl",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/server.crl cert_database=ssl/nss/root+server_ca.crt__server.crl.db",
 	qr/SSL error/,
 	"does not connect with client-side CRL");
 
@@ -365,21 +398,21 @@ command_like(
 # Test min/max SSL protocol versions.
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.2",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.2 cert_database=ssl/nss/root+server_ca.crt.db",
 	"connection success with correct range of TLS protocol versions");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.1",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.1 cert_database=ssl/nss/root+server_ca.crt.db",
 	qr/invalid SSL protocol version range/,
 	"connection failure with incorrect range of TLS protocol versions");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=incorrect_tls",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=incorrect_tls cert_database=ssl/nss/root+server_ca.crt.db",
 	qr/invalid ssl_min_protocol_version value/,
 	"connection failure with an incorrect SSL protocol minimum bound");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_max_protocol_version=incorrect_tls",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_max_protocol_version=incorrect_tls cert_database=ssl/nss/root+server_ca.crt.db",
 	qr/invalid ssl_max_protocol_version value/,
 	"connection failure with an incorrect SSL protocol maximum bound");
 
@@ -390,7 +423,7 @@ test_connect_fails(
 note "running server tests";
 
 $common_connstr =
-  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR";
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client.crt__client.key.db";
 
 # no client cert
 test_connect_fails(
@@ -406,32 +439,43 @@ test_connect_ok(
 	"certificate authorization succeeds with correct client cert in PEM format"
 );
 
-# correct client cert in unencrypted DER
-test_connect_ok(
-	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-der_tmp.key",
-	"certificate authorization succeeds with correct client cert in DER format"
-);
+$common_connstr =
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR";
+
+SKIP:
+{
+	skip "NSS database not implemented in the Makefile", 1 if ($nss);
+	# correct client cert in unencrypted DER
+	test_connect_ok(
+		$common_connstr,
+		"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-der_tmp.key",
+		"certificate authorization succeeds with correct client cert in DER format"
+	);
+}
 
 # correct client cert in encrypted PEM
 test_connect_ok(
 	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='dUmmyP^#+'",
+	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='dUmmyP^#+' cert_database=ssl/nss/client.crt__client-encrypted-pem.key.db",
 	"certificate authorization succeeds with correct client cert in encrypted PEM format"
 );
 
-# correct client cert in encrypted DER
-test_connect_ok(
-	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-der_tmp.key sslpassword='dUmmyP^#+'",
-	"certificate authorization succeeds with correct client cert in encrypted DER format"
-);
+SKIP:
+{
+	skip "NSS database not implemented in the Makefile", 1 if ($nss);
+	# correct client cert in encrypted DER
+	test_connect_ok(
+		$common_connstr,
+		"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-der_tmp.key sslpassword='dUmmyP^#+'",
+		"certificate authorization succeeds with correct client cert in encrypted DER format"
+	);
+}
 
 # correct client cert in encrypted PEM with wrong password
 test_connect_fails(
 	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='wrong'",
-	qr!\Qprivate key file "ssl/client-encrypted-pem_tmp.key": bad decrypt\E!,
+	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='wrong' cert_database=ssl/nss/client.crt__client-encrypted-pem.key.db",
+	qr!connection requires a valid client certificate|\Qprivate key file "ssl/client-encrypted-pem_tmp.key": bad decrypt\E!,
 	"certificate authorization fails with correct client cert and wrong password in encrypted PEM format"
 );
 
@@ -471,18 +515,19 @@ command_like(
 		'-P',
 		'null=_null_',
 		'-d',
-		"$common_connstr user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client_tmp.key",
+		"$common_connstr user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client_tmp.key cert_database=ssl/nss/client.crt__client.key.db",
 		'-c',
 		"SELECT * FROM pg_stat_ssl WHERE pid = pg_backend_pid()"
 	],
 	qr{^pid,ssl,version,cipher,bits,compression,client_dn,client_serial,issuer_dn\r?\n
-				^\d+,t,TLSv[\d.]+,[\w-]+,\d+,f,/CN=ssltestuser,1,\Q/CN=Test CA for PostgreSQL SSL regression test client certs\E\r?$}mx,
+				^\d+,t,TLSv[\d.]+,[\w-]+,\d+,f,/?CN=ssltestuser,1,/?\QCN=Test CA for PostgreSQL SSL regression test client certs\E\r?$}mx,
 	'pg_stat_ssl with client certificate');
 
 # client key with wrong permissions
 SKIP:
 {
 	skip "Permissions check not enforced on Windows", 2 if ($windows_os);
+	skip "Key not on filesystem with NSS",            2 if ($nss);
 
 	test_connect_fails(
 		$common_connstr,
@@ -495,10 +540,13 @@ SKIP:
 test_connect_fails(
 	$common_connstr,
 	"user=anotheruser sslcert=ssl/client.crt sslkey=ssl/client_tmp.key",
-	qr/certificate authentication failed for user "anotheruser"/,
+	qr/unable to verify certificate|certificate authentication failed for user "anotheruser"/,
 	"certificate authorization fails with client cert belonging to another user"
 );
 
+$common_connstr =
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client-revoked.crt__client-revoked.key.db";
+
 # revoked client cert
 test_connect_fails(
 	$common_connstr,
@@ -510,7 +558,7 @@ test_connect_fails(
 # works, iff username matches Common Name
 # fails, iff username doesn't match Common Name.
 $common_connstr =
-  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=verifydb hostaddr=$SERVERHOSTADDR";
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=verifydb hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client.crt__client.key.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -536,17 +584,23 @@ test_connect_ok(
 # intermediate client_ca.crt is provided by client, and isn't in server's ssl_ca_file
 switch_server_cert($node, 'server-cn-only', 'root_ca');
 $common_connstr =
-  "user=ssltestuser dbname=certdb sslkey=ssl/client_tmp.key sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR";
+  "user=ssltestuser dbname=certdb sslkey=ssl/client_tmp.key sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client+client_ca.crt__client.key.db";
 
-test_connect_ok(
+TODO:
+{
+	local $TODO = "WIP failure cause currently unknown";
+	test_connect_ok(
+		$common_connstr,
+		"sslmode=require sslcert=ssl/client+client_ca.crt",
+		"intermediate client certificate is provided by client");
+}
+
+test_connect_fails(
 	$common_connstr,
-	"sslmode=require sslcert=ssl/client+client_ca.crt",
-	"intermediate client certificate is provided by client");
-test_connect_fails($common_connstr, "sslmode=require sslcert=ssl/client.crt",
-	qr/SSL error/, "intermediate client certificate is missing");
+	"sslmode=require sslcert=ssl/client.crt",
+	qr/connection requires a valid client certificate|SSL error/,
+	"intermediate client certificate is missing");
 
 # clean up
-foreach my $key (@keys)
-{
-	unlink("ssl/${key}_tmp.key");
-}
+
+SSL::Server::cleanup();
diff --git a/src/test/ssl/t/002_scram.pl b/src/test/ssl/t/002_scram.pl
index 20ab0d5b0b..b50659e568 100644
--- a/src/test/ssl/t/002_scram.pl
+++ b/src/test/ssl/t/002_scram.pl
@@ -11,11 +11,11 @@ use File::Copy;
 use FindBin;
 use lib $FindBin::RealBin;
 
-use SSLServer;
+use SSL::Server;
 
 if ($ENV{with_openssl} ne 'yes')
 {
-	plan skip_all => 'SSL not supported by this build';
+	plan skip_all => 'OpenSSL not supported by this build';
 }
 
 # This is the hostname used to connect to the server.
diff --git a/src/test/ssl/t/SSL/Backend/NSS.pm b/src/test/ssl/t/SSL/Backend/NSS.pm
new file mode 100644
index 0000000000..837f0d9891
--- /dev/null
+++ b/src/test/ssl/t/SSL/Backend/NSS.pm
@@ -0,0 +1,64 @@
+package SSL::Backend::NSS;
+
+use strict;
+use warnings;
+use Exporter;
+
+our @ISA       = qw(Exporter);
+our @EXPORT_OK = qw(get_new_nss_backend);
+
+sub new
+{
+	my ($class) = @_;
+
+	my $self = { _library => 'NSS' };
+
+	bless $self, $class;
+
+	return $self;
+}
+
+sub get_new_nss_backend
+{
+	my $class = 'SSL::Backend::NSS';
+
+	return $class->new();
+}
+
+sub init
+{
+	# Make sure the certificate databases are in place?
+}
+
+sub get_library
+{
+	my ($self) = @_;
+
+	return $self->{_library};
+}
+
+sub set_server_cert
+{
+	my $self     = $_[0];
+	my $certfile = $_[1];
+	my $cafile   = $_[2];
+	my $keyfile  = $_[3];
+
+	my $cert_nickname = $certfile . '.crt__' . $keyfile . '.key';
+	my $cert_database = $cert_nickname . '.db';
+
+	my $sslconf =
+	    "ssl_ca_file='$cafile.crt'\n"
+	  . "ssl_cert_file='ssl/$certfile.crt'\n"
+	  . "ssl_crl_file=''\n"
+	  . "ssl_database='nss/$cert_database'\n";
+
+	return $sslconf;
+}
+
+sub cleanup
+{
+	# Something?
+}
+
+1;
diff --git a/src/test/ssl/t/SSL/Backend/OpenSSL.pm b/src/test/ssl/t/SSL/Backend/OpenSSL.pm
new file mode 100644
index 0000000000..62b11b7632
--- /dev/null
+++ b/src/test/ssl/t/SSL/Backend/OpenSSL.pm
@@ -0,0 +1,103 @@
+package SSL::Backend::OpenSSL;
+
+use strict;
+use warnings;
+use Exporter;
+use File::Copy;
+
+our @ISA       = qw(Exporter);
+our @EXPORT_OK = qw(get_new_openssl_backend);
+
+our (@keys);
+
+INIT
+{
+	@keys = (
+		"client",     "client-revoked",
+		"client-der", "client-encrypted-pem",
+		"client-encrypted-der");
+}
+
+sub new
+{
+	my ($class) = @_;
+
+	my $self = { _library => 'OpenSSL' };
+
+	bless $self, $class;
+
+	return $self;
+}
+
+sub get_new_openssl_backend
+{
+	my $class = 'SSL::Backend::OpenSSL';
+
+	my $backend = $class->new();
+
+	return $backend;
+}
+
+sub init
+{
+	# The client's private key must not be world-readable, so take a copy
+	# of the key stored in the code tree and update its permissions.
+	#
+	# This changes ssl/client.key to ssl/client_tmp.key etc for the rest
+	# of the tests.
+	foreach my $key (@keys)
+	{
+		copy("ssl/${key}.key", "ssl/${key}_tmp.key")
+		  or die
+		  "couldn't copy ssl/${key}.key to ssl/${key}_tmp.key for permissions change: $!";
+		chmod 0600, "ssl/${key}_tmp.key"
+		  or die "failed to change permissions on ssl/${key}_tmp.key: $!";
+	}
+
+	# Also make a copy of that explicitly world-readable.  We can't
+	# necessarily rely on the file in the source tree having those
+	# permissions. Add it to @keys to include it in the final clean
+	# up phase.
+	copy("ssl/client.key", "ssl/client_wrongperms_tmp.key")
+	  or die
+	  "couldn't copy ssl/client.key to ssl/client_wrongperms_tmp.key: $!";
+	chmod 0644, "ssl/client_wrongperms_tmp.key"
+	  or die
+	  "failed to change permissions on ssl/client_wrongperms_tmp.key: $!";
+	push @keys, 'client_wrongperms';
+}
+
+# Change the configuration to use given server cert file, and reload
+# the server so that the configuration takes effect.
+sub set_server_cert
+{
+	my $self     = $_[0];
+	my $certfile = $_[1];
+	my $cafile   = $_[2] || "root+client_ca";
+	my $keyfile  = $_[3] || $certfile;
+
+	my $sslconf =
+	    "ssl_ca_file='$cafile.crt'\n"
+	  . "ssl_cert_file='$certfile.crt'\n"
+	  . "ssl_key_file='$keyfile.key'\n"
+	  . "ssl_crl_file='root+client.crl'\n";
+
+	return $sslconf;
+}
+
+sub get_library
+{
+	my ($self) = @_;
+
+	return $self->{_library};
+}
+
+sub cleanup
+{
+	foreach my $key (@keys)
+	{
+		unlink("ssl/${key}_tmp.key");
+	}
+}
+
+1;
diff --git a/src/test/ssl/t/SSLServer.pm b/src/test/ssl/t/SSL/Server.pm
similarity index 78%
rename from src/test/ssl/t/SSLServer.pm
rename to src/test/ssl/t/SSL/Server.pm
index f5987a003e..1261d21861 100644
--- a/src/test/ssl/t/SSLServer.pm
+++ b/src/test/ssl/t/SSL/Server.pm
@@ -23,19 +23,39 @@
 # explicitly because an invalid sslcert or sslrootcert, respectively,
 # causes those to be ignored.)
 
-package SSLServer;
+package SSL::Server;
 
 use strict;
 use warnings;
 use PostgresNode;
+use RecursiveCopy;
 use TestLib;
 use File::Basename;
 use File::Copy;
 use Test::More;
+use SSL::Backend::OpenSSL qw(get_new_openssl_backend);
+use SSL::Backend::NSS qw(get_new_nss_backend);
+
+our ($openssl, $nss, $backend);
+
+# The TLS backend which the server is using should be mostly transparent for
+# the user, apart from individual configuration settings, so keep the backend
+# specific things abstracted behind SSL::Server.
+if ($ENV{with_openssl} eq 'yes')
+{
+	$backend = get_new_openssl_backend();
+	$openssl = 1;
+}
+elsif ($ENV{with_nss} eq 'yes')
+{
+	$backend = get_new_nss_backend();
+	$nss     = 1;
+}
 
 use Exporter 'import';
 our @EXPORT = qw(
   configure_test_server_for_ssl
+  set_server_cert
   switch_server_cert
   test_connect_fails
   test_connect_ok
@@ -144,12 +164,19 @@ sub configure_test_server_for_ssl
 	close $sslconf;
 
 	# Copy all server certificates and keys, and client root cert, to the data dir
-	copy_files("ssl/server-*.crt", $pgdata);
-	copy_files("ssl/server-*.key", $pgdata);
-	chmod(0600, glob "$pgdata/server-*.key") or die $!;
-	copy_files("ssl/root+client_ca.crt", $pgdata);
-	copy_files("ssl/root_ca.crt",        $pgdata);
-	copy_files("ssl/root+client.crl",    $pgdata);
+	if (defined($openssl))
+	{
+		copy_files("ssl/server-*.crt", $pgdata);
+		copy_files("ssl/server-*.key", $pgdata);
+		chmod(0600, glob "$pgdata/server-*.key") or die $!;
+		copy_files("ssl/root+client_ca.crt", $pgdata);
+		copy_files("ssl/root_ca.crt",        $pgdata);
+		copy_files("ssl/root+client.crl",    $pgdata);
+	}
+	elsif (defined($nss))
+	{
+		RecursiveCopy::copypath("ssl/nss", $pgdata . "/nss") if -e "ssl/nss";
+	}
 
 	# Stop and restart server to load new listen_addresses.
 	$node->restart;
@@ -157,26 +184,51 @@ sub configure_test_server_for_ssl
 	# Change pg_hba after restart because hostssl requires ssl=on
 	configure_hba_for_ssl($node, $servercidr, $authmethod);
 
+	# Finally, perform backend specific configuration
+	$backend->init();
+
 	return;
 }
 
-# Change the configuration to use given server cert file, and reload
-# the server so that the configuration takes effect.
-sub switch_server_cert
+sub ssl_library
+{
+	return $backend->get_library();
+}
+
+sub cleanup
+{
+	$backend->cleanup();
+}
+
+# Change the configuration to use given server cert file,
+sub set_server_cert
 {
 	my $node     = $_[0];
 	my $certfile = $_[1];
 	my $cafile   = $_[2] || "root+client_ca";
+	my $keyfile  = $_[3] || '';
+	my $pwcmd    = $_[4] || '';
 	my $pgdata   = $node->data_dir;
 
+	$keyfile = $certfile if $keyfile eq '';
+
 	open my $sslconf, '>', "$pgdata/sslconfig.conf";
 	print $sslconf "ssl=on\n";
-	print $sslconf "ssl_ca_file='$cafile.crt'\n";
-	print $sslconf "ssl_cert_file='$certfile.crt'\n";
-	print $sslconf "ssl_key_file='$certfile.key'\n";
-	print $sslconf "ssl_crl_file='root+client.crl'\n";
+	print $sslconf $backend->set_server_cert($certfile, $cafile, $keyfile);
+	print $sslconf "ssl_passphrase_command='$pwcmd'\n"
+	  unless $pwcmd eq '';
 	close $sslconf;
+	return;
+}
 
+# Change the configuration to use given server cert file, and reload
+# the server so that the configuration takes effect.
+# Takes the same arguments as set_server_cert, which it calls to do that
+# piece of the work.
+sub switch_server_cert
+{
+	my $node = $_[0];
+	set_server_cert(@_);
 	$node->restart;
 	return;
 }
-- 
2.21.1 (Apple Git-122.3)

From 6b8d1df2ba900085c50ef3e5ec29f11ee3373171 Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Wed, 28 Oct 2020 11:24:02 +0100
Subject: [PATCH v14 3/6] NSS pg_strong_random support

---
 configure                   | 12 ++++++++++--
 configure.ac                |  9 +++++++--
 src/include/pg_config.h.in  |  3 +++
 src/port/pg_strong_random.c | 37 +++++++++++++++++++++++++++++++++++++
 4 files changed, 57 insertions(+), 4 deletions(-)

diff --git a/configure b/configure
index 48ca9bcafe..412f40b58a 100755
--- a/configure
+++ b/configure
@@ -18391,11 +18391,13 @@ fi
 # in the template or configure command line.
 
 # If not selected manually, try to select a source automatically.
-if test x"$USE_OPENSSL_RANDOM" = x"" && test x"$USE_WIN32_RANDOM" = x"" && test x"$USE_DEV_URANDOM" = x"" ; then
+if test x"$USE_OPENSSL_RANDOM" = x"" && test x"$USE_WIN32_RANDOM" = x"" && test x"$USE_DEV_URANDOM" = x"" && test x"$USE_NSS_RANDOM" = x"" ; then
   if test x"$with_openssl" = x"yes" ; then
     USE_OPENSSL_RANDOM=1
   elif test "$PORTNAME" = "win32" ; then
     USE_WIN32_RANDOM=1
+  elif test x"$with_nss" = x"yes" ; then
+    USE_NSS_RANDOM=1
   else
     { $as_echo "$as_me:${as_lineno-$LINENO}: checking for /dev/urandom" >&5
 $as_echo_n "checking for /dev/urandom... " >&6; }
@@ -18437,6 +18439,12 @@ $as_echo "#define USE_WIN32_RANDOM 1" >>confdefs.h
 
   { $as_echo "$as_me:${as_lineno-$LINENO}: result: Windows native" >&5
 $as_echo "Windows native" >&6; }
+elif test x"$USE_NSS_RANDOM" = x"1" ; then
+
+$as_echo "#define USE_NSS_RANDOM 1" >>confdefs.h
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: NSS" >&5
+$as_echo "NSS" >&6; }
 elif test x"$USE_DEV_URANDOM" = x"1" ; then
 
 $as_echo "#define USE_DEV_URANDOM 1" >>confdefs.h
@@ -18446,7 +18454,7 @@ $as_echo "/dev/urandom" >&6; }
 else
   as_fn_error $? "
 no source of strong random numbers was found
-PostgreSQL can use OpenSSL or /dev/urandom as a source of random numbers." "$LINENO" 5
+PostgreSQL can use OpenSSL, NSS, Windows native RNG or /dev/urandom as a source of random numbers." "$LINENO" 5
 fi
 
 # If not set in template file, set bytes to use libc memset()
diff --git a/configure.ac b/configure.ac
index 89fbb5e171..86311946d0 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2199,11 +2199,13 @@ fi
 # in the template or configure command line.
 
 # If not selected manually, try to select a source automatically.
-if test x"$USE_OPENSSL_RANDOM" = x"" && test x"$USE_WIN32_RANDOM" = x"" && test x"$USE_DEV_URANDOM" = x"" ; then
+if test x"$USE_OPENSSL_RANDOM" = x"" && test x"$USE_WIN32_RANDOM" = x"" && test x"$USE_DEV_URANDOM" = x"" && test x"$USE_NSS_RANDOM" = x"" ; then
   if test x"$with_openssl" = x"yes" ; then
     USE_OPENSSL_RANDOM=1
   elif test "$PORTNAME" = "win32" ; then
     USE_WIN32_RANDOM=1
+  elif test x"$with_nss" = x"yes" ; then
+    USE_NSS_RANDOM=1
   else
     AC_CHECK_FILE([/dev/urandom], [], [])
 
@@ -2220,13 +2222,16 @@ if test x"$USE_OPENSSL_RANDOM" = x"1" ; then
 elif test x"$USE_WIN32_RANDOM" = x"1" ; then
   AC_DEFINE(USE_WIN32_RANDOM, 1, [Define to use native Windows API for random number generation])
   AC_MSG_RESULT([Windows native])
+elif test x"$USE_NSS_RANDOM" = x"1" ; then
+  AC_DEFINE(USE_NSS_RANDOM, 1, [Define to use NSS for random number generation])
+  AC_MSG_RESULT([NSS])
 elif test x"$USE_DEV_URANDOM" = x"1" ; then
   AC_DEFINE(USE_DEV_URANDOM, 1, [Define to use /dev/urandom for random number generation])
   AC_MSG_RESULT([/dev/urandom])
 else
   AC_MSG_ERROR([
 no source of strong random numbers was found
-PostgreSQL can use OpenSSL or /dev/urandom as a source of random numbers.])
+PostgreSQL can use OpenSSL, NSS, Windows native RNG or /dev/urandom as a source of random numbers.])
 fi
 
 # If not set in template file, set bytes to use libc memset()
diff --git a/src/include/pg_config.h.in b/src/include/pg_config.h.in
index 31f808398c..73c39b449c 100644
--- a/src/include/pg_config.h.in
+++ b/src/include/pg_config.h.in
@@ -896,6 +896,9 @@
 /* Define to build with NSS support (--with-nss) */
 #undef USE_NSS
 
+/* Define to use NSS for random number generation */
+#undef USE_NSS_RANDOM
+
 /* Define to 1 to use software CRC-32C implementation (slicing-by-8). */
 #undef USE_SLICING_BY_8_CRC32C
 
diff --git a/src/port/pg_strong_random.c b/src/port/pg_strong_random.c
index 14e8382cd8..33af92a60b 100644
--- a/src/port/pg_strong_random.c
+++ b/src/port/pg_strong_random.c
@@ -30,6 +30,20 @@
 #ifdef USE_WIN32_RANDOM
 #include <wincrypt.h>
 #endif
+#ifdef USE_NSS_RANDOM
+#define pg_BITS_PER_BYTE BITS_PER_BYTE
+#undef BITS_PER_BYTE
+#include <nss/nss.h>
+#include <nss/pk11pub.h>
+#if defined(BITS_PER_BYTE)
+#if BITS_PER_BYTE != pg_BITS_PER_BYTE
+#error "incompatible byte widths between NSPR and postgres"
+#endif
+#else
+#define BITS_PER_BYTE pg_BITS_PER_BYTE
+#endif
+#undef pg_BITS_PER_BYTE
+#endif
 
 #ifdef USE_WIN32_RANDOM
 /*
@@ -158,6 +172,29 @@ pg_strong_random(void *buf, size_t len)
 	}
 	return false;
 
+#elif defined(USE_NSS_RANDOM)
+	NSSInitParameters params;
+	NSSInitContext *nss_context;
+	SECStatus status;
+
+	memset(&params, 0, sizeof(params));
+	params.length = sizeof(params);
+	nss_context = NSS_InitContext("", "", "", "", &params,
+							  NSS_INIT_READONLY | NSS_INIT_NOCERTDB |
+							  NSS_INIT_NOMODDB | NSS_INIT_FORCEOPEN |
+							  NSS_INIT_NOROOTINIT | NSS_INIT_PK11RELOAD);
+
+	if (!nss_context)
+		return false;
+
+	status = PK11_GenerateRandom(buf, len);
+	NSS_ShutdownContext(nss_context);
+
+	if (status == SECSuccess)
+		return true;
+
+	return false;
+
 	/*
 	 * Read /dev/urandom ourselves.
 	 */
-- 
2.21.1 (Apple Git-122.3)

From 4d00729574d3245c7255bd9e22086bbc9a09b83b Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Wed, 28 Oct 2020 11:26:31 +0100
Subject: [PATCH v14 4/6] NSS Documentation

---
 doc/src/sgml/acronyms.sgml     | 43 +++++++++++++++++++
 doc/src/sgml/config.sgml       | 28 ++++++++++--
 doc/src/sgml/installation.sgml | 30 ++++++++++++-
 doc/src/sgml/libpq.sgml        | 27 ++++++++++--
 doc/src/sgml/runtime.sgml      | 78 ++++++++++++++++++++++++++++++++--
 5 files changed, 195 insertions(+), 11 deletions(-)

diff --git a/doc/src/sgml/acronyms.sgml b/doc/src/sgml/acronyms.sgml
index 4e5ec983c0..4f6f0cf353 100644
--- a/doc/src/sgml/acronyms.sgml
+++ b/doc/src/sgml/acronyms.sgml
@@ -441,6 +441,28 @@
     </listitem>
    </varlistentry>
 
+   <varlistentry>
+    <term><acronym>NSPR</acronym></term>
+    <listitem>
+     <para>
+      <ulink
+      url="https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSPR">
+      Netscape Portable Runtime</ulink>
+     </para>
+    </listitem>
+   </varlistentry>
+
+   <varlistentry>
+    <term><acronym>NSS</acronym></term>
+    <listitem>
+     <para>
+      <ulink
+      url="https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS">
+      Network Security Services</ulink>
+     </para>
+    </listitem>
+   </varlistentry>
+
    <varlistentry>
     <term><acronym>ODBC</acronym></term>
     <listitem>
@@ -539,6 +561,17 @@
     </listitem>
    </varlistentry>
 
+   <varlistentry>
+    <term><acronym>PKCS#12</acronym></term>
+    <listitem>
+     <para>
+      <ulink
+      url="https://en.wikipedia.org/wiki/PKCS_12">
+      Public-Key Cryptography Standards #12</ulink>
+     </para>
+    </listitem>
+   </varlistentry>
+
    <varlistentry>
     <term><acronym>PL</acronym></term>
     <listitem>
@@ -684,6 +717,16 @@
     </listitem>
    </varlistentry>
 
+   <varlistentry>
+    <term><acronym>TLS</acronym></term>
+    <listitem>
+     <para>
+      <ulink url="https://sv.wikipedia.org/wiki/Transport_Layer_Security">
+      Transport Layer Security</ulink>
+     </para>
+    </listitem>
+   </varlistentry>
+
    <varlistentry>
     <term><acronym>TOAST</acronym></term>
     <listitem>
diff --git a/doc/src/sgml/config.sgml b/doc/src/sgml/config.sgml
index f043433e31..f7ae3b1be1 100644
--- a/doc/src/sgml/config.sgml
+++ b/doc/src/sgml/config.sgml
@@ -1208,6 +1208,23 @@ include_dir 'conf.d'
       </listitem>
      </varlistentry>
 
+     <varlistentry id="guc-ssl-database" xreflabel="ssl_database">
+      <term><varname>ssl_database</varname> (<type>string</type>)
+      <indexterm>
+       <primary><varname>ssl_database</varname> configuration parameter</primary>
+      </indexterm>
+      </term>
+      <listitem>
+       <para>
+        Specifies the name of the file containing the server certificates and
+        keys when using <productname>NSS</productname> for <acronym>SSL</acronym>
+        connections. This parameter can only be set in the
+        <filename>postgresql.conf</filename> file or on the server command
+        line.
+       </para>
+      </listitem>
+     </varlistentry>
+
      <varlistentry id="guc-ssl-ciphers" xreflabel="ssl_ciphers">
       <term><varname>ssl_ciphers</varname> (<type>string</type>)
       <indexterm>
@@ -1224,7 +1241,9 @@ include_dir 'conf.d'
         connections using TLS version 1.2 and lower are affected.  There is
         currently no setting that controls the cipher choices used by TLS
         version 1.3 connections.  The default value is
-        <literal>HIGH:MEDIUM:+3DES:!aNULL</literal>.  The default is usually a
+        <literal>HIGH:MEDIUM:+3DES:!aNULL</literal> for servers which have
+        been built with <productname>OpenSSL</productname> as the
+        <acronym>SSL</acronym> library.  The default is usually a
         reasonable choice unless you have specific security requirements.
        </para>
 
@@ -1426,8 +1445,11 @@ include_dir 'conf.d'
        <para>
         Sets an external command to be invoked when a passphrase for
         decrypting an SSL file such as a private key needs to be obtained.  By
-        default, this parameter is empty, which means the built-in prompting
-        mechanism is used.
+        default, this parameter is empty. When the server is using
+        <productname>OpenSSL</productname>, this means the built-in prompting
+        mechanism is used. When using <productname>NSS</productname>, there is
+        no default prompting so a blank callback will be used returning an
+        empty password.
        </para>
        <para>
         The command must print the passphrase to the standard output and exit
diff --git a/doc/src/sgml/installation.sgml b/doc/src/sgml/installation.sgml
index 0ac1cb9999..bd09124fb0 100644
--- a/doc/src/sgml/installation.sgml
+++ b/doc/src/sgml/installation.sgml
@@ -250,7 +250,7 @@ su - postgres
 
     <listitem>
      <para>
-      You need <productname>OpenSSL</productname>, if you want to support
+      You need a supported <acronym>SSL</acronym> library, if you want to support
       encrypted client connections.  <productname>OpenSSL</productname> is
       also required for random number generation on platforms that do not
       have <filename>/dev/urandom</filename> (except Windows).  The minimum
@@ -966,6 +966,31 @@ build-postgresql:
        </listitem>
       </varlistentry>
 
+      <varlistentry>
+       <term><option>--with-nss</option>
+       <indexterm>
+        <primary>NSS</primary>
+        <secondary>NSPR</secondary>
+        <seealso>SSL</seealso>
+       </indexterm>
+       </term>
+       <listitem>
+        <para>
+         Build with support for <acronym>SSL</acronym> (encrypted)
+         connections using <productname>NSS</productname>. This requires the
+         <productname>NSS</productname> package to be installed. Additionally,
+         <productname>NSS</productname> requires <productname>NSPR</productname>
+         to be installed. <filename>configure</filename> will check for the
+         required header files and libraries to make sure that your
+         <productname>NSS</productname> installation is sufficient before
+         proceeding.
+        </para>
+        <para>
+         This option is incompatible with <literal>--with-openssl</literal>.
+        </para>
+       </listitem>
+      </varlistentry>
+
       <varlistentry>
        <term><option>--with-openssl</option>
        <indexterm>
@@ -982,6 +1007,9 @@ build-postgresql:
          your <productname>OpenSSL</productname> installation is sufficient
          before proceeding.
         </para>
+        <para>
+         This option is incompatible with <literal>--with-nss</literal>.
+        </para>
        </listitem>
       </varlistentry>
 
diff --git a/doc/src/sgml/libpq.sgml b/doc/src/sgml/libpq.sgml
index 9ce32fb39b..61d9082052 100644
--- a/doc/src/sgml/libpq.sgml
+++ b/doc/src/sgml/libpq.sgml
@@ -2459,6 +2459,8 @@ void *PQsslStruct(const PGconn *conn, const char *struct_name);
       </para>
       <para>
        The struct(s) available depend on the SSL implementation in use.
+      </para>
+      <para>
        For <productname>OpenSSL</productname>, there is one struct,
        available under the name "OpenSSL", and it returns a pointer to the
        <productname>OpenSSL</productname> <literal>SSL</literal> struct.
@@ -2482,9 +2484,14 @@ void *PQsslStruct(const PGconn *conn, const char *struct_name);
 ]]></programlisting>
       </para>
       <para>
-       This structure can be used to verify encryption levels, check server
-       certificates, and more. Refer to the <productname>OpenSSL</productname>
-       documentation for information about this structure.
+       For <productname>NSS</productname>, there is one struct available under
+       the name "NSS", and it returns a pointer to the
+       <productname>NSS</productname> <literal>PRFileDesc</literal>.
+      </para>
+      <para>
+       These structures can be used to verify encryption levels, check server
+       certificates, and more. Refer to the <acronym>SSL</acronym> library
+       documentation for information about these structures.
       </para>
      </listitem>
     </varlistentry>
@@ -2511,6 +2518,10 @@ void *PQgetssl(const PGconn *conn);
        <xref linkend="libpq-PQsslInUse"/> instead, and for more details about the
        connection, use <xref linkend="libpq-PQsslAttribute"/>.
       </para>
+      <para>
+       This function returns <literal>NULL</literal> when <acronym>SSL</acronym>
+       librariaes other than <productname>OpenSSL</productname> are used.
+      </para>
      </listitem>
     </varlistentry>
 
@@ -7943,6 +7954,11 @@ void PQinitOpenSSL(int do_ssl, int do_crypto);
        before first opening a database connection.  Also be sure that you
        have done that initialization before opening a database connection.
       </para>
+
+      <para>
+       This function does nothing when using <productname>NSS</productname> as
+       the <acronym>SSL</acronym> library.
+      </para>
      </listitem>
     </varlistentry>
 
@@ -7969,6 +7985,11 @@ void PQinitSSL(int do_ssl);
        might be preferable for applications that need to work with older
        versions of <application>libpq</application>.
       </para>
+
+      <para>
+       This function does nothing when using <productname>NSS</productname> as
+       the <acronym>SSL</acronym> library.
+      </para>
      </listitem>
     </varlistentry>
    </variablelist>
diff --git a/doc/src/sgml/runtime.sgml b/doc/src/sgml/runtime.sgml
index 17e938148c..fe7e305b75 100644
--- a/doc/src/sgml/runtime.sgml
+++ b/doc/src/sgml/runtime.sgml
@@ -2183,15 +2183,21 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
 
   <indexterm zone="ssl-tcp">
    <primary>SSL</primary>
+   <secondary>TLS</secondary>
   </indexterm>
 
   <para>
    <productname>PostgreSQL</productname> has native support for using
    <acronym>SSL</acronym> connections to encrypt client/server communications
    for increased security. This requires that
-   <productname>OpenSSL</productname> is installed on both client and
+   a supported TLS library is installed on both client and
    server systems and that support in <productname>PostgreSQL</productname> is
    enabled at build time (see <xref linkend="installation"/>).
+   Supported libraries are <productname>OpenSSL</productname> and
+   <productname>NSS</productname>. The terms <acronym>SSL</acronym> and
+   <acronym>TLS</acronym> are often used interchangeably to mean a secure
+   connection using a <acronym>TLS</acronym> protocol, even though
+   <acronym>SSL</acronym> protocols are no longer supported.
   </para>
 
   <sect2 id="ssl-setup">
@@ -2211,8 +2217,13 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
   </para>
 
   <para>
-   To start in <acronym>SSL</acronym> mode, files containing the server certificate
-   and private key must exist.  By default, these files are expected to be
+   To start in <acronym>SSL</acronym> mode, a server certificate
+   and private key must exist. The below sections on the different libraries
+   will discuss how to configure these.
+  </para>
+   
+  <para>
+   By default, these files are expected to be
    named <filename>server.crt</filename> and <filename>server.key</filename>, respectively, in
    the server's data directory, but other names and locations can be specified
    using the configuration parameters <xref linkend="guc-ssl-cert-file"/>
@@ -2302,6 +2313,18 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
   </note>
   </sect2>
 
+  <sect2 id="ssl-nss-config">
+   <title>NSS Configuration</title>
+
+  <para>
+   <productname>PostgreSQL</productname> will look for certificates and keys
+   in the <productname>NSS</productname> database specified by the parameter
+   <xref linkend="guc-ssl-database"/> in <filename>postgresql.conf</filename>.
+   The paramaters for certificate and key filenames are used to identify the
+   nicknames in the database.
+  </para>
+  </sect2>
+
   <sect2 id="ssl-client-certificates">
    <title>Using Client Certificates</title>
 
@@ -2376,7 +2399,7 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
   </sect2>
 
   <sect2 id="ssl-server-files">
-   <title>SSL Server File Usage</title>
+   <title>SSL Server File Parameter Usage</title>
 
    <para>
     <xref linkend="ssl-file-usage"/> summarizes the files that are
@@ -2423,6 +2446,14 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
       <entry>client certificate must not be on this list</entry>
      </row>
 
+     <row>
+      <entry><xref linkend="guc-ssl-database"/></entry>
+      <entry>certificate database</entry>
+      <entry>contains server certificates, keys and revocation lists; only
+      used when <productname>PostgreSQL</productname> is built with support
+      for <productname>NSS</productname>.</entry>
+     </row>
+
     </tbody>
    </tgroup>
   </table>
@@ -2550,6 +2581,45 @@ openssl x509 -req -in server.csr -text -days 365 \
    </para>
   </sect2>
 
+  <sect2 id="nss-certificate-database">
+   <title>NSS Certificate Databases</title>
+
+   <para>
+    When using <productname>NSS</productname>, all certificates and keys must
+    be loaded into an <productname>NSS</productname> certificate database.
+   </para>
+
+   <para>
+    To create a new <productname>NSS</productname> certificate database and
+    load the certificates created in <xref linkend="ssl-certificate-creation" />,
+    use the following <productname>NSS</productname> commands:
+<programlisting>
+certutil -d "sql:server.db" -N --empty-password
+certutil -d "sql:server.db" -A -n server.crt -i server.crt -t "CT,C,C"
+certutil -d "sql:server.db" -A -n root.crt -i root.crt -t "CT,C,C"
+</programlisting>
+    This will give the certificate the filename as the nickname identifier in
+    the database which is created as <filename>server.db</filename>.
+   </para>
+   <para>
+    Then load the server key, which require converting it to
+    <acronym>PKCS#12</acronym> format using the
+    <productname>OpenSSL</productname> tools:
+<programlisting>
+openssl pkcs12 -export -out server.pfx -inkey server.key -in server.crt \
+  -certfile root.crt -passout pass:
+pk12util -i server.pfx -d server.db -W ''
+</programlisting>
+   </para>
+   <para>
+    Finally a certificate revocation list can be loaded with the following
+    commands:
+<programlisting>
+crlutil -I -i server.crl -d server.db -B
+</programlisting>
+   </para>
+  </sect2>
+
  </sect1>
 
  <sect1 id="gssapi-enc">
-- 
2.21.1 (Apple Git-122.3)

From 027cb4c4352a9e2a8309bb1a0c1f7aa567feccbe Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Wed, 28 Oct 2020 11:34:37 +0100
Subject: [PATCH v14 5/6] NSS contrib modules

---
 contrib/Makefile            |   2 +-
 contrib/pgcrypto/Makefile   |   5 +
 contrib/pgcrypto/nss.c      | 773 ++++++++++++++++++++++++++++++++++++
 contrib/pgcrypto/px.c       |   1 +
 contrib/pgcrypto/px.h       |   1 +
 contrib/sslinfo/sslinfo.c   | 164 ++++----
 doc/src/sgml/pgcrypto.sgml  |  38 +-
 doc/src/sgml/sslinfo.sgml   |  12 +-
 src/tools/msvc/Install.pm   |   3 +-
 src/tools/msvc/Mkvcbuild.pm |  12 +-
 10 files changed, 910 insertions(+), 101 deletions(-)
 create mode 100644 contrib/pgcrypto/nss.c

diff --git a/contrib/Makefile b/contrib/Makefile
index 7a4866e338..d0b01cb2cc 100644
--- a/contrib/Makefile
+++ b/contrib/Makefile
@@ -52,7 +52,7 @@ SUBDIRS = \
 		unaccent	\
 		vacuumlo
 
-ifeq ($(with_openssl),yes)
+ifeq ($(with_ssl),yes)
 SUBDIRS += sslinfo
 else
 ALWAYS_SUBDIRS += sslinfo
diff --git a/contrib/pgcrypto/Makefile b/contrib/pgcrypto/Makefile
index 61eabd2fc0..6c69ee5a6b 100644
--- a/contrib/pgcrypto/Makefile
+++ b/contrib/pgcrypto/Makefile
@@ -7,11 +7,16 @@ INT_TESTS = sha2
 OSSL_SRCS = openssl.c pgp-mpi-openssl.c
 OSSL_TESTS = sha2 des 3des cast5
 
+NSS_SRCS = nss.c pgp-mpi-internal.c imath.c blf.c
+NSS_TESTS = sha2 des 3des
+
 ZLIB_TST = pgp-compression
 ZLIB_OFF_TST = pgp-zlib-DISABLED
 
 CF_SRCS = $(if $(subst no,,$(with_openssl)), $(OSSL_SRCS), $(INT_SRCS))
+CF_SRCS = $(if $(subst no,,$(with_nss)), $(NSS_SRCS), $(INT_SRCS))
 CF_TESTS = $(if $(subst no,,$(with_openssl)), $(OSSL_TESTS), $(INT_TESTS))
+CF_TESTS = $(if $(subst no,,$(with_nss)), $(NSS_TESTS), $(INT_TESTS))
 CF_PGP_TESTS = $(if $(subst no,,$(with_zlib)), $(ZLIB_TST), $(ZLIB_OFF_TST))
 
 SRCS = \
diff --git a/contrib/pgcrypto/nss.c b/contrib/pgcrypto/nss.c
new file mode 100644
index 0000000000..e1291ed403
--- /dev/null
+++ b/contrib/pgcrypto/nss.c
@@ -0,0 +1,773 @@
+/*-------------------------------------------------------------------------
+ *
+ * nss.c
+ *	  Wrapper for using NSS as a backend for pgcrypto PX
+ *
+ *
+ * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ *	  contrib/pgcrypto/nss.c
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#include "postgres.h"
+
+#include "px.h"
+#include "blf.h"
+#include "utils/memutils.h"
+
+/*
+ * BITS_PER_BYTE is also defined in the NSPR header files, so we need to undef
+ * our version to avoid compiler warnings on redefinition.
+ */
+#define pg_BITS_PER_BYTE BITS_PER_BYTE
+#undef BITS_PER_BYTE
+
+#include <nss/nss.h>
+#include <nss/hasht.h>
+#include <nss/pk11func.h>
+#include <nss/pk11pub.h>
+#include <nss/secitem.h>
+#include <nss/sechash.h>
+#include <nss/secoid.h>
+#include <nss/secerr.h>
+
+/*
+ * Ensure that the colliding definitions match, else throw an error. In case
+ * NSPR has removed the definition for some reason, make sure to put ours
+ * back again.
+ */
+#if defined(BITS_PER_BYTE)
+#if BITS_PER_BYTE != pg_BITS_PER_BYTE
+#error "incompatible byte widths between NSPR and postgres"
+#endif
+#else
+#define BITS_PER_BYTE pg_BITS_PER_BYTE
+#endif
+#undef pg_BITS_PER_BYTE
+
+/*
+ * Define our own mechanisms for Blowfish as it's not implemented by NSS.
+ */
+#define BLOWFISH_CBC	(1)
+#define BLOWFISH_ECB	(2)
+
+/*
+ * Data structures for recording cipher implementations as well as ongoing
+ * cipher operations.
+ */
+typedef struct nss_digest
+{
+	NSSInitContext *context;
+	PK11Context *hash_context;
+	HASH_HashType hash_type;
+}			nss_digest;
+
+typedef struct cipher_implementation
+{
+	/* Function pointers to cipher operations */
+	int			(*init) (PX_Cipher *pxc, const uint8 *key, unsigned klen, const uint8 *iv);
+	unsigned	(*get_block_size) (PX_Cipher *pxc);
+	unsigned 	(*get_key_size) (PX_Cipher *pxc);
+	unsigned 	(*get_iv_size) (PX_Cipher *pxc);
+	int			(*encrypt) (PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res);
+	int			(*decrypt) (PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res);
+	void		(*free) (PX_Cipher *pxc);
+
+	/* The mechanism describing the cipher used */
+	union
+	{
+		CK_MECHANISM_TYPE nss;
+		CK_ULONG internal;
+	}			mechanism;
+	int			keylen;
+	bool		is_nss;
+}			cipher_implementation;
+
+typedef struct nss_cipher
+{
+	const cipher_implementation *impl;
+	NSSInitContext *context;
+	PK11Context *crypt_context;
+	SECItem *params;
+
+	PK11SymKey *encrypt_key;
+	PK11SymKey *decrypt_key;
+}			nss_cipher;
+
+typedef struct internal_cipher
+{
+	const cipher_implementation *impl;
+	BlowfishContext	context;
+}			internal_cipher;
+
+typedef struct nss_cipher_ref
+{
+	const char *name;
+	const cipher_implementation *impl;
+} nss_cipher_ref;
+
+/*
+ * Prototypes
+ */
+static unsigned nss_get_iv_size(PX_Cipher *pxc);
+static unsigned nss_get_block_size(PX_Cipher *pxc);
+
+/*
+ * nss_GetHashOidTagByHashType
+ *
+ * Returns the corresponding SECOidTag for the passed hash type. NSS 3.43
+ * includes HASH_GetHashOidTagByHashType for this purpose, but at the time of
+ * writing is not commonly available so we need our own version till then.
+ */
+static SECOidTag
+nss_GetHashOidTagByHashType(HASH_HashType type)
+{
+	if (type == HASH_AlgMD2)
+		return SEC_OID_MD2;
+	if (type == HASH_AlgMD5)
+		return SEC_OID_MD5;
+	if (type == HASH_AlgSHA1)
+		return SEC_OID_SHA1;
+	if (type == HASH_AlgSHA224)
+		return SEC_OID_SHA224;
+	if (type == HASH_AlgSHA256)
+		return SEC_OID_SHA256;
+	if (type == HASH_AlgSHA384)
+		return SEC_OID_SHA384;
+	if (type == HASH_AlgSHA512)
+		return SEC_OID_SHA512;
+
+	return SEC_OID_UNKNOWN;
+}
+
+static unsigned
+nss_digest_block_size(PX_MD *pxmd)
+{
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+	const SECHashObject *object;
+
+	object = HASH_GetHashObject(digest->hash_type);
+	return object->blocklength;
+}
+
+static unsigned
+nss_digest_result_size(PX_MD *pxmd)
+{
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+	const SECHashObject *object;
+
+	object = HASH_GetHashObject(digest->hash_type);
+	return object->length;
+}
+
+static void
+nss_digest_free(PX_MD *pxmd)
+{
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+	PRBool	free_ctx = PR_TRUE;
+
+	PK11_DestroyContext(digest->hash_context, free_ctx);
+	NSS_ShutdownContext(digest->context);
+}
+
+static void
+nss_digest_update(PX_MD *pxmd, const uint8 *data, unsigned dlen)
+{
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+
+	PK11_DigestOp(digest->hash_context, data, dlen);
+}
+
+static void
+nss_digest_reset(PX_MD *pxmd)
+{
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+
+	PK11_DigestBegin(digest->hash_context);
+}
+
+static void
+nss_digest_finish(PX_MD *pxmd, uint8 *dst)
+{
+	unsigned int outlen;
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+	const SECHashObject *object;
+
+	object = HASH_GetHashObject(digest->hash_type);
+	PK11_DigestFinal(digest->hash_context, dst, &outlen, object->length);
+}
+
+int
+px_find_digest(const char *name, PX_MD **res)
+{
+	PX_MD	*pxmd;
+	NSSInitParameters params;
+	NSSInitContext *nss_context;
+	bool found = false;
+	nss_digest *digest;
+	SECStatus status;
+	SECOidData *hash;
+	HASH_HashType t;
+
+	/*
+	 * Initialize our own NSS context without a database backing it.
+	 */
+	memset(&params, 0, sizeof(params));
+	params.length = sizeof(params);
+	nss_context = NSS_InitContext("", "", "", "", &params,
+								  NSS_INIT_READONLY | NSS_INIT_NOCERTDB |
+								  NSS_INIT_NOMODDB | NSS_INIT_FORCEOPEN |
+								  NSS_INIT_NOROOTINIT | NSS_INIT_PK11RELOAD);
+
+	/*
+	 * There is no API function for looking up a digest algorithm from a name
+	 * string, but there is a publically accessible array which can be scanned
+	 * for the name.
+	 */
+	for (t = HASH_AlgNULL + 1; t < HASH_AlgTOTAL; t++)
+	{
+		SECOidTag 	hash_oid;
+		char *p;
+
+		hash_oid = nss_GetHashOidTagByHashType(t);
+
+		if (hash_oid == SEC_OID_UNKNOWN)
+			return PXE_NO_HASH;
+
+		hash = SECOID_FindOIDByTag(hash_oid);
+		if (pg_strcasecmp(hash->desc, name) == 0)
+		{
+			found = true;
+			break;
+		}
+
+		/*
+		 * NSS saves the algorithm names using SHA-xxx notation whereas
+		 * OpenSSL use SHAxxx. To make sure the user finds the requested
+		 * algorithm let's remove the dash and compare that spelling as well.
+		 */
+		if ((p = strchr(hash->desc, '-')) != NULL)
+		{
+			char tmp[12];
+
+			memcpy(tmp, hash->desc, p - hash->desc);
+			memcpy(tmp + (p - hash->desc), p + 1, strlen(hash->desc) - (p - hash->desc) + 1);
+			if (pg_strcasecmp(tmp, name) == 0)
+			{
+				found = true;
+				break;
+			}
+		}
+	}
+
+	if (!found)
+		return PXE_NO_HASH;
+
+	digest = palloc(sizeof(*digest));
+
+	digest->context = nss_context;
+	digest->hash_context = PK11_CreateDigestContext(hash->offset);
+	digest->hash_type = t;
+	if (digest->hash_context == NULL)
+	{
+		pfree(digest);
+		return -1;
+	}
+
+	status = PK11_DigestBegin(digest->hash_context);
+	if (status != SECSuccess)
+	{
+		PK11_DestroyContext(digest->hash_context, PR_TRUE);
+		pfree(digest);
+		return -1;
+	}
+
+	pxmd = palloc(sizeof(*pxmd));
+	pxmd->result_size = nss_digest_result_size;
+	pxmd->block_size = nss_digest_block_size;
+	pxmd->reset = nss_digest_reset;
+	pxmd->update = nss_digest_update;
+	pxmd->finish = nss_digest_finish;
+	pxmd->free = nss_digest_free;
+	pxmd->p.ptr = (void *) digest;
+
+	*res = pxmd;
+
+	return 0;
+}
+
+static int
+bf_init(PX_Cipher *pxc, const uint8 *key, unsigned klen, const uint8 *iv)
+{
+	internal_cipher *cipher = (internal_cipher *) pxc->ptr;
+
+	blowfish_setkey(&cipher->context, key, klen);
+	if (iv)
+		blowfish_setiv(&cipher->context, iv);
+
+	return 0;
+}
+
+static int
+bf_encrypt(PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res)
+{
+	internal_cipher *cipher = (internal_cipher *) pxc->ptr;
+	uint8 *buf;
+
+	if (dlen == 0)
+		return 0;
+
+	if (dlen & 7)
+		return PXE_NOTBLOCKSIZE;
+
+	buf = palloc(dlen);
+	memcpy(buf, data, dlen);
+
+	if (cipher->impl->mechanism.internal == BLOWFISH_ECB)
+		blowfish_encrypt_ecb(buf, dlen, &cipher->context);
+	else
+		blowfish_encrypt_cbc(buf, dlen, &cipher->context);
+
+	memcpy(res, buf, dlen);
+	pfree(buf);
+
+	return 0;
+}
+
+static int
+bf_decrypt(PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res)
+{
+	internal_cipher *cipher = (internal_cipher *) pxc->ptr;
+
+	if (dlen == 0)
+		return 0;
+
+	if (dlen & 7)
+		return PXE_NOTBLOCKSIZE;
+
+	memcpy(res, data, dlen);
+	if (cipher->impl->mechanism.internal == BLOWFISH_ECB)
+		blowfish_decrypt_ecb(res, dlen, &cipher->context);
+	else
+		blowfish_decrypt_cbc(res, dlen, &cipher->context);
+
+	return 0;
+}
+
+static void
+bf_free(PX_Cipher *pxc)
+{
+	internal_cipher *cipher = (internal_cipher *) pxc->ptr;
+
+	pfree(cipher);
+	pfree(pxc);
+}
+
+static int
+nss_symkey_blockcipher_init(PX_Cipher *pxc, const uint8 *key, unsigned klen,
+							const uint8 *iv)
+{
+	nss_cipher	   *cipher = (nss_cipher *) pxc->ptr;
+	SECItem			iv_item;
+	unsigned char  *iv_item_data;
+	SECItem			key_item;
+	int				keylen;
+	PK11SlotInfo   *slot;
+
+	if (cipher->impl->mechanism.nss == CKM_AES_CBC ||
+		cipher->impl->mechanism.nss == CKM_AES_ECB)
+	{
+		if (klen <= 128 / 8)
+			keylen = 128 / 8;
+		else if (klen <= 192 / 8)
+			keylen = 192 / 8;
+		else if (klen <= 256 / 8)
+			keylen = 256 / 8;
+		else
+			return PXE_CIPHER_INIT;
+	}
+	else
+		keylen = cipher->impl->keylen;
+
+	key_item.type = siBuffer;
+	key_item.data = (unsigned char *) key;
+	key_item.len = keylen;
+
+	/*
+	 * If hardware acceleration is configured in NSS one can theoretically get
+	 * a better slot by calling PK11_GetBestSlot() with the mechanism passed
+	 * to it. Unless there are complaints, using the simpler API will make
+	 * error handling easier though.
+	 */
+	slot = PK11_GetInternalSlot();
+	if (!slot)
+		return PXE_CIPHER_INIT;
+
+	/*
+	 * The key must be set up for the operation, and since we don't know at
+	 * this point whether we are asked to encrypt or decrypt we need to store
+	 * both versions.
+	 */
+	cipher->decrypt_key = PK11_ImportSymKey(slot, cipher->impl->mechanism.nss,
+											PK11_OriginUnwrap,
+											CKA_DECRYPT, &key_item,
+											NULL);
+	cipher->encrypt_key = PK11_ImportSymKey(slot, cipher->impl->mechanism.nss,
+											PK11_OriginUnwrap,
+											CKA_ENCRYPT, &key_item,
+											NULL);
+	PK11_FreeSlot(slot);
+
+	if (!cipher->decrypt_key || !cipher->encrypt_key)
+		return PXE_CIPHER_INIT;
+
+	if (iv)
+	{
+		iv_item.type = siBuffer;
+		iv_item.data = (unsigned char *) iv;
+		iv_item.len = nss_get_iv_size(pxc);
+	}
+	else
+	{
+		/*
+		 * The documentation states that either passing .data = 0; .len = 0;
+		 * in the iv_item, or NULL as iv_item, to PK11_ParamFromIV should be
+		 * done when IV is missing. That however leads to segfaults in the
+		 * library, the workaround that works in modern  library versions is
+		 * to pass in a keysized zeroed out IV.
+		 */
+		iv_item_data = palloc0(nss_get_iv_size(pxc));
+		iv_item.type = siBuffer;
+		iv_item.data = iv_item_data;
+		iv_item.len = nss_get_iv_size(pxc);
+	}
+
+	cipher->params = PK11_ParamFromIV(cipher->impl->mechanism.nss, &iv_item);
+
+	/* If we had to make a mock IV, free it once made into a param */
+	if (!iv)
+		pfree(iv_item_data);
+
+	if (cipher->params == NULL)
+		return PXE_CIPHER_INIT;
+
+	return 0;
+}
+
+static int
+nss_decrypt(PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res)
+{
+	nss_cipher *cipher = (nss_cipher *) pxc->ptr;
+	SECStatus	status;
+	int outlen;
+
+	if (!cipher->crypt_context)
+	{
+		cipher->crypt_context =
+			PK11_CreateContextBySymKey(cipher->impl->mechanism.nss, CKA_DECRYPT,
+									   cipher->decrypt_key, cipher->params);
+	}
+
+	status = PK11_CipherOp(cipher->crypt_context, res, &outlen, dlen, data, dlen);
+	if (status != SECSuccess)
+		return PXE_DECRYPT_FAILED;
+
+	return 0;
+}
+
+static int
+nss_encrypt(PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res)
+{
+	nss_cipher *cipher = (nss_cipher *) pxc->ptr;
+	SECStatus	status;
+	int outlen;
+
+	if (!cipher->crypt_context)
+	{
+		cipher->crypt_context =
+			PK11_CreateContextBySymKey(cipher->impl->mechanism.nss, CKA_ENCRYPT,
+									   cipher->decrypt_key, cipher->params);
+	}
+
+	status = PK11_CipherOp(cipher->crypt_context, res, &outlen, dlen, data, dlen);
+
+	if (status != SECSuccess)
+		return PXE_DECRYPT_FAILED;
+
+	return 0;
+}
+
+static void
+nss_free(PX_Cipher *pxc)
+{
+	nss_cipher *cipher = pxc->ptr;
+	PRBool		free_ctx = PR_TRUE;
+
+	PK11_FreeSymKey(cipher->encrypt_key);
+	PK11_FreeSymKey(cipher->decrypt_key);
+	PK11_DestroyContext(cipher->crypt_context, free_ctx);
+	NSS_ShutdownContext(cipher->context);
+	pfree(cipher);
+
+	pfree(pxc);
+}
+
+static unsigned
+nss_get_block_size(PX_Cipher *pxc)
+{
+	nss_cipher *cipher = pxc->ptr;
+
+	return PK11_GetBlockSize(cipher->impl->mechanism.nss, NULL);
+}
+
+static unsigned
+nss_get_key_size(PX_Cipher *pxc)
+{
+	nss_cipher *cipher = pxc->ptr;
+
+	return cipher->impl->keylen;
+}
+
+static unsigned
+nss_get_iv_size(PX_Cipher *pxc)
+{
+	nss_cipher *cipher = pxc->ptr;
+
+	return PK11_GetIVLength(cipher->impl->mechanism.nss);
+}
+
+static unsigned
+bf_get_block_size(PX_Cipher *pxc)
+{
+	return 8;
+}
+
+static unsigned
+bf_get_key_size(PX_Cipher *pxc)
+{
+	return 448 / 8;
+}
+
+static unsigned
+bf_get_iv_size(PX_Cipher *pxc)
+{
+	return 8;
+}
+
+/*
+ * Cipher Implementations
+ */
+static const cipher_implementation nss_des_cbc = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_DES_CBC,
+	.keylen = 8,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_des_ecb = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_DES_ECB,
+	.keylen = 8,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_des3_cbc = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_DES3_CBC,
+	.keylen = 24,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_des3_ecb = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_DES3_ECB,
+	.keylen = 24,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_aes_cbc = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_AES_CBC,
+	.keylen = 32,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_aes_ecb = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_AES_ECB,
+	.keylen = 32,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_bf_ecb = {
+	.init = bf_init,
+	.get_block_size = bf_get_block_size,
+	.get_key_size = bf_get_key_size,
+	.get_iv_size = bf_get_iv_size,
+	.encrypt = bf_encrypt,
+	.decrypt = bf_decrypt,
+	.free = bf_free,
+	.mechanism.internal = BLOWFISH_ECB,
+	.keylen = 56,
+	.is_nss = false
+};
+
+static const cipher_implementation nss_bf_cbc = {
+	.init = bf_init,
+	.get_block_size = bf_get_block_size,
+	.get_key_size = bf_get_key_size,
+	.get_iv_size = bf_get_iv_size,
+	.encrypt = bf_encrypt,
+	.decrypt = bf_decrypt,
+	.free = bf_free,
+	.mechanism.internal = BLOWFISH_CBC,
+	.keylen = 56,
+	.is_nss = false
+};
+
+/*
+ * Lookup table for finding the implementation based on a name. CAST5 as well
+ * as BLOWFISH are defined as cipher mechanisms in NSS but error out with
+ * SEC_ERROR_INVALID_ALGORITHM. Blowfish is implemented using the internal
+ * implementation while CAST5 isn't supported at all at this time,
+ */
+static const nss_cipher_ref nss_cipher_lookup[] = {
+	{"des", &nss_des_cbc},
+	{"des-cbc", &nss_des_cbc},
+	{"des-ecb", &nss_des_ecb},
+	{"des3-cbc", &nss_des3_cbc},
+	{"3des", &nss_des3_cbc},
+	{"3des-cbc", &nss_des3_cbc},
+	{"des3-ecb", &nss_des3_ecb},
+	{"3des-ecb", &nss_des3_ecb},
+	{"aes", &nss_aes_cbc},
+	{"aes-cbc", &nss_aes_cbc},
+	{"aes-ecb", &nss_aes_ecb},
+	{"rijndael", &nss_aes_cbc},
+	{"rijndael-cbc", &nss_aes_cbc},
+	{"rijndael-ecb", &nss_aes_ecb},
+	{"blowfish", &nss_bf_cbc},
+	{"blowfish-cbc", &nss_bf_cbc},
+	{"blowfish-ecb", &nss_bf_ecb},
+	{"bf", &nss_bf_cbc},
+	{"bf-cbc", &nss_bf_cbc},
+	{"bf-ecb", &nss_bf_ecb},
+	{NULL}
+};
+
+/*
+ * px_find_cipher
+ *
+ * Search for the requested cipher and see if there is support for it, and if
+ * so return an allocated object containing the playbook for how to encrypt
+ * and decrypt using the cipher.
+ */
+int
+px_find_cipher(const char *alias, PX_Cipher **res)
+{
+	const nss_cipher_ref *cipher_ref;
+	PX_Cipher  *px_cipher;
+	NSSInitParameters params;
+	NSSInitContext *nss_context;
+	nss_cipher	*cipher;
+	internal_cipher *int_cipher;
+
+	for (cipher_ref = nss_cipher_lookup; cipher_ref->name; cipher_ref++)
+	{
+		if (strcmp(cipher_ref->name, alias) == 0)
+			break;
+	}
+
+	if (!cipher_ref->name)
+		return PXE_NO_CIPHER;
+
+	/*
+	 * Fill in the PX_Cipher to pass back to PX describing the operations to
+	 * perform in order to use the cipher.
+	 */
+	px_cipher = palloc(sizeof(*px_cipher));
+	px_cipher->block_size = cipher_ref->impl->get_block_size;
+	px_cipher->key_size = cipher_ref->impl->get_key_size;
+	px_cipher->iv_size = cipher_ref->impl->get_iv_size;
+	px_cipher->free = cipher_ref->impl->free;
+	px_cipher->init = cipher_ref->impl->init;
+	px_cipher->encrypt = cipher_ref->impl->encrypt;
+	px_cipher->decrypt = cipher_ref->impl->decrypt;
+
+	/*
+	 * Set the private data, which is different for NSS and internal ciphers
+	 */
+	if (cipher_ref->impl->is_nss)
+	{
+		/*
+		 * Initialize our own NSS context without a database backing it. At
+		 * some point we might want to allow users to use stored keys in the
+		 * database rather than passing them via SELECT encrypt(), and then
+		 * this need to be changed to open a user specified database.
+		 */
+		memset(&params, 0, sizeof(params));
+		params.length = sizeof(params);
+		nss_context = NSS_InitContext("", "", "", "", &params,
+									  NSS_INIT_READONLY | NSS_INIT_NOCERTDB |
+									  NSS_INIT_NOMODDB | NSS_INIT_FORCEOPEN |
+									  NSS_INIT_NOROOTINIT | NSS_INIT_PK11RELOAD);
+
+		/* nss_cipher is the private state struct for the operation */
+		cipher = palloc(sizeof(*cipher));
+		cipher->context = nss_context;
+		cipher->impl = cipher_ref->impl;
+		cipher->crypt_context = NULL;
+
+		px_cipher->ptr = cipher;
+	}
+	else
+	{
+		int_cipher = palloc0(sizeof(*int_cipher));
+
+		int_cipher->impl = cipher_ref->impl;
+		px_cipher->ptr = int_cipher;
+	}
+
+	*res = px_cipher;
+	return 0;
+}
diff --git a/contrib/pgcrypto/px.c b/contrib/pgcrypto/px.c
index 6a4681dae9..a243f575d3 100644
--- a/contrib/pgcrypto/px.c
+++ b/contrib/pgcrypto/px.c
@@ -58,6 +58,7 @@ static const struct error_desc px_err_list[] = {
 	{PXE_MCRYPT_INTERNAL, "mcrypt internal error"},
 	{PXE_NO_RANDOM, "Failed to generate strong random bits"},
 	{PXE_DECRYPT_FAILED, "Decryption failed"},
+	{PXE_ENCRYPT_FAILED, "Encryption failed"},
 	{PXE_PGP_CORRUPT_DATA, "Wrong key or corrupt data"},
 	{PXE_PGP_CORRUPT_ARMOR, "Corrupt ascii-armor"},
 	{PXE_PGP_UNSUPPORTED_COMPR, "Unsupported compression algorithm"},
diff --git a/contrib/pgcrypto/px.h b/contrib/pgcrypto/px.h
index 5487923edb..17d6f22498 100644
--- a/contrib/pgcrypto/px.h
+++ b/contrib/pgcrypto/px.h
@@ -61,6 +61,7 @@
 #define PXE_MCRYPT_INTERNAL			-16
 #define PXE_NO_RANDOM				-17
 #define PXE_DECRYPT_FAILED			-18
+#define PXE_ENCRYPT_FAILED			-19
 
 #define PXE_PGP_CORRUPT_DATA		-100
 #define PXE_PGP_CORRUPT_ARMOR		-101
diff --git a/contrib/sslinfo/sslinfo.c b/contrib/sslinfo/sslinfo.c
index 5ba3988e27..84bb2c65b8 100644
--- a/contrib/sslinfo/sslinfo.c
+++ b/contrib/sslinfo/sslinfo.c
@@ -9,9 +9,11 @@
 
 #include "postgres.h"
 
+#ifdef USE_OPENSSL
 #include <openssl/x509.h>
 #include <openssl/x509v3.h>
 #include <openssl/asn1.h>
+#endif
 
 #include "access/htup_details.h"
 #include "funcapi.h"
@@ -21,8 +23,8 @@
 
 PG_MODULE_MAGIC;
 
+#ifdef USE_OPENSSL
 static Datum X509_NAME_field_to_text(X509_NAME *name, text *fieldName);
-static Datum X509_NAME_to_text(X509_NAME *name);
 static Datum ASN1_STRING_to_text(ASN1_STRING *str);
 
 /*
@@ -32,6 +34,7 @@ typedef struct
 {
 	TupleDesc	tupdesc;
 } SSLExtensionInfoContext;
+#endif
 
 /*
  * Indicates whether current session uses SSL
@@ -54,9 +57,16 @@ PG_FUNCTION_INFO_V1(ssl_version);
 Datum
 ssl_version(PG_FUNCTION_ARGS)
 {
-	if (MyProcPort->ssl == NULL)
+	const char *version;
+
+	if (!MyProcPort->ssl_in_use)
+		PG_RETURN_NULL();
+
+	version = be_tls_get_version(MyProcPort);
+	if (version == NULL)
 		PG_RETURN_NULL();
-	PG_RETURN_TEXT_P(cstring_to_text(SSL_get_version(MyProcPort->ssl)));
+
+	PG_RETURN_TEXT_P(cstring_to_text(version));
 }
 
 
@@ -67,9 +77,16 @@ PG_FUNCTION_INFO_V1(ssl_cipher);
 Datum
 ssl_cipher(PG_FUNCTION_ARGS)
 {
-	if (MyProcPort->ssl == NULL)
+	const char *cipher;
+
+	if (!MyProcPort->ssl_in_use)
 		PG_RETURN_NULL();
-	PG_RETURN_TEXT_P(cstring_to_text(SSL_get_cipher(MyProcPort->ssl)));
+
+	cipher = be_tls_get_cipher(MyProcPort);
+	if (cipher == NULL)
+		PG_RETURN_NULL();
+
+	PG_RETURN_TEXT_P(cstring_to_text(cipher));
 }
 
 
@@ -83,7 +100,7 @@ PG_FUNCTION_INFO_V1(ssl_client_cert_present);
 Datum
 ssl_client_cert_present(PG_FUNCTION_ARGS)
 {
-	PG_RETURN_BOOL(MyProcPort->peer != NULL);
+	PG_RETURN_BOOL(MyProcPort->peer_cert_valid);
 }
 
 
@@ -99,29 +116,26 @@ PG_FUNCTION_INFO_V1(ssl_client_serial);
 Datum
 ssl_client_serial(PG_FUNCTION_ARGS)
 {
+	char decimal[NAMEDATALEN];
 	Datum		result;
-	Port	   *port = MyProcPort;
-	X509	   *peer = port->peer;
-	ASN1_INTEGER *serial = NULL;
-	BIGNUM	   *b;
-	char	   *decimal;
 
-	if (!peer)
+	if (!MyProcPort->ssl_in_use || !MyProcPort->peer_cert_valid)
+		PG_RETURN_NULL();
+
+	be_tls_get_peer_serial(MyProcPort, decimal, NAMEDATALEN);
+
+	if (!*decimal)
 		PG_RETURN_NULL();
-	serial = X509_get_serialNumber(peer);
-	b = ASN1_INTEGER_to_BN(serial, NULL);
-	decimal = BN_bn2dec(b);
 
-	BN_free(b);
 	result = DirectFunctionCall3(numeric_in,
 								 CStringGetDatum(decimal),
 								 ObjectIdGetDatum(0),
 								 Int32GetDatum(-1));
-	OPENSSL_free(decimal);
 	return result;
 }
 
 
+#ifdef USE_OPENSSL
 /*
  * Converts OpenSSL ASN1_STRING structure into text
  *
@@ -228,7 +242,7 @@ ssl_client_dn_field(PG_FUNCTION_ARGS)
 	text	   *fieldname = PG_GETARG_TEXT_PP(0);
 	Datum		result;
 
-	if (!(MyProcPort->peer))
+	if (!MyProcPort->ssl_in_use || !MyProcPort->peer_cert_valid)
 		PG_RETURN_NULL();
 
 	result = X509_NAME_field_to_text(X509_get_subject_name(MyProcPort->peer), fieldname);
@@ -273,76 +287,23 @@ ssl_issuer_field(PG_FUNCTION_ARGS)
 	else
 		return result;
 }
+#endif							/* USE_OPENSSL */
 
-
-/*
- * Equivalent of X509_NAME_oneline that respects encoding
- *
- * This function converts X509_NAME structure to the text variable
- * converting all textual data into current database encoding.
- *
- * Parameter: X509_NAME *name X509_NAME structure to be converted
- *
- * Returns: text datum which contains string representation of
- * X509_NAME
- */
-static Datum
-X509_NAME_to_text(X509_NAME *name)
+#ifdef USE_NSS
+PG_FUNCTION_INFO_V1(ssl_client_dn_field);
+Datum
+ssl_client_dn_field(PG_FUNCTION_ARGS)
 {
-	BIO		   *membuf = BIO_new(BIO_s_mem());
-	int			i,
-				nid,
-				count = X509_NAME_entry_count(name);
-	X509_NAME_ENTRY *e;
-	ASN1_STRING *v;
-	const char *field_name;
-	size_t		size;
-	char		nullterm;
-	char	   *sp;
-	char	   *dp;
-	text	   *result;
-
-	if (membuf == NULL)
-		ereport(ERROR,
-				(errcode(ERRCODE_OUT_OF_MEMORY),
-				 errmsg("could not create OpenSSL BIO structure")));
-
-	(void) BIO_set_close(membuf, BIO_CLOSE);
-	for (i = 0; i < count; i++)
-	{
-		e = X509_NAME_get_entry(name, i);
-		nid = OBJ_obj2nid(X509_NAME_ENTRY_get_object(e));
-		if (nid == NID_undef)
-			ereport(ERROR,
-					(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
-					 errmsg("could not get NID for ASN1_OBJECT object")));
-		v = X509_NAME_ENTRY_get_data(e);
-		field_name = OBJ_nid2sn(nid);
-		if (field_name == NULL)
-			field_name = OBJ_nid2ln(nid);
-		if (field_name == NULL)
-			ereport(ERROR,
-					(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
-					 errmsg("could not convert NID %d to an ASN1_OBJECT structure", nid)));
-		BIO_printf(membuf, "/%s=", field_name);
-		ASN1_STRING_print_ex(membuf, v,
-							 ((ASN1_STRFLGS_RFC2253 & ~ASN1_STRFLGS_ESC_MSB)
-							  | ASN1_STRFLGS_UTF8_CONVERT));
-	}
-
-	/* ensure null termination of the BIO's content */
-	nullterm = '\0';
-	BIO_write(membuf, &nullterm, 1);
-	size = BIO_get_mem_data(membuf, &sp);
-	dp = pg_any_to_server(sp, size - 1, PG_UTF8);
-	result = cstring_to_text(dp);
-	if (dp != sp)
-		pfree(dp);
-	if (BIO_free(membuf) != 1)
-		elog(ERROR, "could not free OpenSSL BIO structure");
+	PG_RETURN_NULL();
+}
 
-	PG_RETURN_TEXT_P(result);
+PG_FUNCTION_INFO_V1(ssl_issuer_field);
+Datum
+ssl_issuer_field(PG_FUNCTION_ARGS)
+{
+	PG_RETURN_NULL();
 }
+#endif							/* USE_NSS */
 
 
 /*
@@ -358,9 +319,17 @@ PG_FUNCTION_INFO_V1(ssl_client_dn);
 Datum
 ssl_client_dn(PG_FUNCTION_ARGS)
 {
-	if (!(MyProcPort->peer))
+	char		subject[NAMEDATALEN];
+
+	if (!MyProcPort->ssl_in_use || !MyProcPort->peer_cert_valid)
+		PG_RETURN_NULL();
+
+	be_tls_get_peer_subject_name(MyProcPort, subject, NAMEDATALEN);
+
+	if (!*subject)
 		PG_RETURN_NULL();
-	return X509_NAME_to_text(X509_get_subject_name(MyProcPort->peer));
+
+	PG_RETURN_TEXT_P(cstring_to_text(subject));
 }
 
 
@@ -377,12 +346,21 @@ PG_FUNCTION_INFO_V1(ssl_issuer_dn);
 Datum
 ssl_issuer_dn(PG_FUNCTION_ARGS)
 {
-	if (!(MyProcPort->peer))
+	char		issuer[NAMEDATALEN];
+
+	if (!MyProcPort->ssl_in_use || !MyProcPort->peer_cert_valid)
+		PG_RETURN_NULL();
+
+	be_tls_get_peer_issuer_name(MyProcPort, issuer, NAMEDATALEN);
+
+	if (!*issuer)
 		PG_RETURN_NULL();
-	return X509_NAME_to_text(X509_get_issuer_name(MyProcPort->peer));
+
+	PG_RETURN_TEXT_P(cstring_to_text(issuer));
 }
 
 
+#ifdef USE_OPENSSL
 /*
  * Returns information about available SSL extensions.
  *
@@ -516,3 +494,13 @@ ssl_extension_info(PG_FUNCTION_ARGS)
 	/* All done */
 	SRF_RETURN_DONE(funcctx);
 }
+#endif							/* USE_OPENSSL */
+
+#ifdef USE_NSS
+PG_FUNCTION_INFO_V1(ssl_extension_info);
+Datum
+ssl_extension_info(PG_FUNCTION_ARGS)
+{
+	PG_RETURN_NULL();
+}
+#endif							/* USE_NSS */
diff --git a/doc/src/sgml/pgcrypto.sgml b/doc/src/sgml/pgcrypto.sgml
index 8748c64e2d..f03e1f5fcf 100644
--- a/doc/src/sgml/pgcrypto.sgml
+++ b/doc/src/sgml/pgcrypto.sgml
@@ -45,8 +45,9 @@ digest(data bytea, type text) returns bytea
     <literal>sha224</literal>, <literal>sha256</literal>,
     <literal>sha384</literal> and <literal>sha512</literal>.
     If <filename>pgcrypto</filename> was built with
-    <productname>OpenSSL</productname>, more algorithms are available, as
-    detailed in <xref linkend="pgcrypto-with-without-openssl"/>.
+    <productname>OpenSSL</productname> or <productname>NSS</productname>,
+    more algorithms are available, as
+    detailed in <xref linkend="pgcrypto-with-without-openssl-nss"/>.
    </para>
 
    <para>
@@ -763,7 +764,7 @@ pgp_sym_encrypt(data, psw, 'compress-algo=1, cipher-algo=aes256')
     Which cipher algorithm to use.
    </para>
 <literallayout>
-Values: bf, aes128, aes192, aes256 (OpenSSL-only: <literal>3des</literal>, <literal>cast5</literal>)
+Values: bf, aes128, aes192, aes256 (OpenSSL-only: <literal>3des</literal>, <literal>cast5</literal>; NSS-only: <literal>3des</literal>)
 Default: aes128
 Applies to: pgp_sym_encrypt, pgp_pub_encrypt
 </literallayout>
@@ -1152,8 +1153,8 @@ gen_random_uuid() returns uuid
    <para>
     <filename>pgcrypto</filename> configures itself according to the findings of the
     main PostgreSQL <literal>configure</literal> script.  The options that
-    affect it are <literal>--with-zlib</literal> and
-    <literal>--with-openssl</literal>.
+    affect it are <literal>--with-zlib</literal>,
+    <literal>--with-openssl</literal> and <literal>--with-nss</literal>.
    </para>
 
    <para>
@@ -1168,14 +1169,16 @@ gen_random_uuid() returns uuid
     BIGNUM functions.
    </para>
 
-   <table id="pgcrypto-with-without-openssl">
-    <title>Summary of Functionality with and without OpenSSL</title>
-    <tgroup cols="3">
+   <table id="pgcrypto-with-without-openssl-nss">
+    <title>Summary of Functionality with and without external cryptographic
+      library</title>
+    <tgroup cols="4">
      <thead>
       <row>
        <entry>Functionality</entry>
        <entry>Built-in</entry>
        <entry>With OpenSSL</entry>
+       <entry>With NSS</entry>
       </row>
      </thead>
      <tbody>
@@ -1183,51 +1186,67 @@ gen_random_uuid() returns uuid
        <entry>MD5</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>SHA1</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>SHA224/256/384/512</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>Other digest algorithms</entry>
        <entry>no</entry>
        <entry>yes (Note 1)</entry>
+       <entry>yes (Note 1)</entry>
       </row>
       <row>
        <entry>Blowfish</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>AES</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>DES/3DES/CAST5</entry>
        <entry>no</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
+      </row>
+      <row>
+       <entry>CAST5</entry>
+       <entry>no</entry>
+       <entry>yes</entry>
+       <entry>no</entry>
       </row>
       <row>
        <entry>Raw encryption</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>PGP Symmetric encryption</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>PGP Public-Key encryption</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
      </tbody>
     </tgroup>
@@ -1240,7 +1259,8 @@ gen_random_uuid() returns uuid
    <orderedlist>
     <listitem>
      <para>
-      Any digest algorithm <productname>OpenSSL</productname> supports
+      Any digest algorithm <productname>OpenSSL</productname> and
+      <productname>NSS</productname> supports
       is automatically picked up.
       This is not possible with ciphers, which need to be supported
       explicitly.
diff --git a/doc/src/sgml/sslinfo.sgml b/doc/src/sgml/sslinfo.sgml
index e16f61b41d..e8a4e7b332 100644
--- a/doc/src/sgml/sslinfo.sgml
+++ b/doc/src/sgml/sslinfo.sgml
@@ -22,7 +22,8 @@
 
  <para>
   This extension won't build at all unless the installation was
-  configured with <literal>--with-openssl</literal>.
+  configured with SSL support, such as <literal>--with-openssl</literal>
+  or <literal>--with-nss</literal>.
  </para>
 
  <sect2>
@@ -208,6 +209,9 @@ emailAddress
      the X.500 and X.509 standards, so you cannot just assign arbitrary
      meaning to them.
     </para>
+    <para>
+     This function is only available when using <productname>OpenSSL</productname>.
+    </para>
     </listitem>
    </varlistentry>
 
@@ -223,6 +227,9 @@ emailAddress
      Same as <function>ssl_client_dn_field</function>, but for the certificate issuer
      rather than the certificate subject.
     </para>
+    <para>
+     This function is only available when using <productname>OpenSSL</productname>.
+    </para>
     </listitem>
    </varlistentry>
 
@@ -238,6 +245,9 @@ emailAddress
      Provide information about extensions of client certificate: extension name,
      extension value, and if it is a critical extension.
     </para>
+    <para>
+     This function is only available when using <productname>OpenSSL</productname>.
+    </para>
     </listitem>
    </varlistentry>
   </variablelist>
diff --git a/src/tools/msvc/Install.pm b/src/tools/msvc/Install.pm
index ea3af48777..afe72a7e97 100644
--- a/src/tools/msvc/Install.pm
+++ b/src/tools/msvc/Install.pm
@@ -438,7 +438,8 @@ sub CopyContribFiles
 		{
 			# These configuration-based exclusions must match vcregress.pl
 			next if ($d eq "uuid-ossp"  && !defined($config->{uuid}));
-			next if ($d eq "sslinfo"    && !defined($config->{openssl}));
+			next if ($d eq "sslinfo"    && !defined($config->{openssl})
+			  && !defined($config->{nss}));
 			next if ($d eq "xml2"       && !defined($config->{xml}));
 			next if ($d =~ /_plperl$/   && !defined($config->{perl}));
 			next if ($d =~ /_plpython$/ && !defined($config->{python}));
diff --git a/src/tools/msvc/Mkvcbuild.pm b/src/tools/msvc/Mkvcbuild.pm
index 29879b51af..379f861a56 100644
--- a/src/tools/msvc/Mkvcbuild.pm
+++ b/src/tools/msvc/Mkvcbuild.pm
@@ -442,9 +442,14 @@ sub mkvcbuild
 		push @contrib_excludes, 'xml2';
 	}
 
+	if (!$solution->{options}->{openssl} && !$solution->{options}->{nss})
+	{
+		push @contrib_excludes, 'sslinfo';
+	}
+
 	if (!$solution->{options}->{openssl})
 	{
-		push @contrib_excludes, 'sslinfo', 'ssl_passphrase_callback';
+		push @contrib_excludes, 'ssl_passphrase_callback';
 	}
 
 	if (!$solution->{options}->{uuid})
@@ -474,6 +479,11 @@ sub mkvcbuild
 		$pgcrypto->AddFiles('contrib/pgcrypto', 'openssl.c',
 			'pgp-mpi-openssl.c');
 	}
+	elsif ($solution->{options}->{nss})
+	{
+		$pgcrypto->AddFiles('contrib/pgcrypto', 'nss.c',
+			'pgp-mpi-internal.c', 'imath.c', 'blf.c');
+	}
 	else
 	{
 		$pgcrypto->AddFiles(
-- 
2.21.1 (Apple Git-122.3)

From f2e9c124ecf695f0434588037ac37592f6f3848e Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Wed, 28 Oct 2020 11:35:06 +0100
Subject: [PATCH v14 6/6] NSS to be submitted separately

---
 contrib/pgcrypto/openssl.c            |  2 +-
 doc/src/sgml/sslinfo.sgml             |  2 +-
 src/backend/libpq/be-secure-openssl.c | 16 +++++++++++++++-
 3 files changed, 17 insertions(+), 3 deletions(-)

diff --git a/contrib/pgcrypto/openssl.c b/contrib/pgcrypto/openssl.c
index ed96e4ce53..5ebe213406 100644
--- a/contrib/pgcrypto/openssl.c
+++ b/contrib/pgcrypto/openssl.c
@@ -400,7 +400,7 @@ gen_ossl_encrypt(PX_Cipher *c, const uint8 *data, unsigned dlen,
 	}
 
 	if (!EVP_EncryptUpdate(od->evp_ctx, res, &outlen, data, dlen))
-		return PXE_ERR_GENERIC;
+		return PXE_ENCRYPT_FAILED;
 
 	return 0;
 }
diff --git a/doc/src/sgml/sslinfo.sgml b/doc/src/sgml/sslinfo.sgml
index e8a4e7b332..253bb697af 100644
--- a/doc/src/sgml/sslinfo.sgml
+++ b/doc/src/sgml/sslinfo.sgml
@@ -55,7 +55,7 @@
     <listitem>
     <para>
      Returns the name of the protocol used for the SSL connection (e.g., TLSv1.0
-     TLSv1.1, or TLSv1.2).
+     TLSv1.1, TLSv1.2 or TLSv1.3).
     </para>
     </listitem>
    </varlistentry>
diff --git a/src/backend/libpq/be-secure-openssl.c b/src/backend/libpq/be-secure-openssl.c
index 8b21ff4065..5962cffc0c 100644
--- a/src/backend/libpq/be-secure-openssl.c
+++ b/src/backend/libpq/be-secure-openssl.c
@@ -1298,15 +1298,28 @@ X509_NAME_to_cstring(X509_NAME *name)
 	char	   *dp;
 	char	   *result;
 
+	if (membuf == NULL)
+		ereport(ERROR,
+				(errcode(ERRCODE_OUT_OF_MEMORY),
+				 errmsg("failed to create BIO")));
+
 	(void) BIO_set_close(membuf, BIO_CLOSE);
 	for (i = 0; i < count; i++)
 	{
 		e = X509_NAME_get_entry(name, i);
 		nid = OBJ_obj2nid(X509_NAME_ENTRY_get_object(e));
+		if (nid == NID_undef)
+			ereport(ERROR,
+					(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
+					 errmsg("could not get NID for ASN1_OBJECT object")));
 		v = X509_NAME_ENTRY_get_data(e);
 		field_name = OBJ_nid2sn(nid);
 		if (!field_name)
 			field_name = OBJ_nid2ln(nid);
+		if (field_name == NULL)
+			ereport(ERROR,
+					(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
+					 errmsg("could not convert NID %d to an ASN1_OBJECT structure", nid)));
 		BIO_printf(membuf, "/%s=", field_name);
 		ASN1_STRING_print_ex(membuf, v,
 							 ((ASN1_STRFLGS_RFC2253 & ~ASN1_STRFLGS_ESC_MSB)
@@ -1322,7 +1335,8 @@ X509_NAME_to_cstring(X509_NAME *name)
 	result = pstrdup(dp);
 	if (dp != sp)
 		pfree(dp);
-	BIO_free(membuf);
+	if (BIO_free(membuf) != 1)
+		elog(ERROR, "could not free OpenSSL BIO structure");
 
 	return result;
 }
-- 
2.21.1 (Apple Git-122.3)

From 67efed92f5b60196066b79cae1fdb775f0edd785 Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Wed, 28 Oct 2020 11:18:42 +0100
Subject: [PATCH v15 1/6] NSS Frontend, Backend and build infra

---
 configure                                     |  401 +++++-
 configure.ac                                  |   60 +-
 .../postgres_fdw/expected/postgres_fdw.out    |    2 +-
 src/Makefile.global.in                        |    2 +-
 src/backend/libpq/Makefile                    |    6 +-
 src/backend/libpq/auth.c                      |    7 +
 src/backend/libpq/be-secure-nss.c             | 1173 +++++++++++++++++
 src/backend/libpq/be-secure.c                 |    3 +
 src/backend/libpq/hba.c                       |    2 +-
 src/backend/utils/misc/guc.c                  |   20 +-
 src/common/Makefile                           |    2 +-
 src/include/common/pg_nss.h                   |  141 ++
 src/include/libpq/libpq-be.h                  |   13 +-
 src/include/libpq/libpq.h                     |    3 +
 src/include/pg_config.h.in                    |    3 +
 src/include/pg_config_manual.h                |    5 +-
 src/interfaces/libpq/Makefile                 |   13 +-
 src/interfaces/libpq/fe-connect.c             |    4 +
 src/interfaces/libpq/fe-secure-nss.c          | 1018 ++++++++++++++
 src/interfaces/libpq/fe-secure.c              |    5 +-
 src/interfaces/libpq/libpq-fe.h               |   11 +
 src/interfaces/libpq/libpq-int.h              |    5 +
 src/tools/msvc/Mkvcbuild.pm                   |   22 +-
 src/tools/msvc/Solution.pm                    |   20 +
 src/tools/msvc/config_default.pl              |    1 +
 25 files changed, 2871 insertions(+), 71 deletions(-)
 create mode 100644 src/backend/libpq/be-secure-nss.c
 create mode 100644 src/include/common/pg_nss.h
 create mode 100644 src/interfaces/libpq/fe-secure-nss.c

diff --git a/configure b/configure
index ace4ed5dec..6287a0e2fe 100755
--- a/configure
+++ b/configure
@@ -654,6 +654,9 @@ LIBOBJS
 UUID_LIBS
 LDAP_LIBS_BE
 LDAP_LIBS_FE
+with_ssl
+NSPR_CONFIG
+NSS_CONFIG
 PTHREAD_CFLAGS
 PTHREAD_LIBS
 PTHREAD_CC
@@ -711,7 +714,6 @@ with_uuid
 with_readline
 with_systemd
 with_selinux
-with_openssl
 with_ldap
 with_krb_srvnam
 krb_srvtab
@@ -856,7 +858,6 @@ with_pam
 with_bsd_auth
 with_ldap
 with_bonjour
-with_openssl
 with_selinux
 with_systemd
 with_readline
@@ -868,6 +869,8 @@ with_libxslt
 with_system_tzdata
 with_zlib
 with_gnu_ld
+with_ssl
+with_openssl
 enable_largefile
 '
       ac_precious_vars='build_alias
@@ -1558,7 +1561,6 @@ Optional Packages:
   --with-bsd-auth         build with BSD Authentication support
   --with-ldap             build with LDAP support
   --with-bonjour          build with Bonjour support
-  --with-openssl          build with OpenSSL support
   --with-selinux          build with SELinux support
   --with-systemd          build with systemd support
   --without-readline      do not use GNU Readline nor BSD Libedit for editing
@@ -1572,6 +1574,8 @@ Optional Packages:
                           use system time zone data in DIR
   --without-zlib          do not use Zlib
   --with-gnu-ld           assume the C compiler uses GNU ld [default=no]
+  --with-ssl=LIB          use LIB for SSL/TLS support (openssl, nss)
+  --with-openssl          obsolete spelling of --with-ssl=openssl
 
 Some influential environment variables:
   CC          C compiler command
@@ -8071,41 +8075,6 @@ fi
 $as_echo "$with_bonjour" >&6; }
 
 
-#
-# OpenSSL
-#
-{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether to build with OpenSSL support" >&5
-$as_echo_n "checking whether to build with OpenSSL support... " >&6; }
-
-
-
-# Check whether --with-openssl was given.
-if test "${with_openssl+set}" = set; then :
-  withval=$with_openssl;
-  case $withval in
-    yes)
-
-$as_echo "#define USE_OPENSSL 1" >>confdefs.h
-
-      ;;
-    no)
-      :
-      ;;
-    *)
-      as_fn_error $? "no argument expected for --with-openssl option" "$LINENO" 5
-      ;;
-  esac
-
-else
-  with_openssl=no
-
-fi
-
-
-{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $with_openssl" >&5
-$as_echo "$with_openssl" >&6; }
-
-
 #
 # SELinux
 #
@@ -12179,7 +12148,64 @@ fi
   fi
 fi
 
+#
+# SSL Library
+#
+# There are currently two supported SSL/TLS libraries, OpenSSL and NSS.
+#
+
+
+
+# Check whether --with-ssl was given.
+if test "${with_ssl+set}" = set; then :
+  withval=$with_ssl;
+  case $withval in
+    yes)
+      as_fn_error $? "argument required for --with-ssl option" "$LINENO" 5
+      ;;
+    no)
+      as_fn_error $? "argument required for --with-ssl option" "$LINENO" 5
+      ;;
+    *)
+
+      ;;
+  esac
+
+fi
+
+
+if test x"$with_ssl" = x"" ; then
+  with_ssl=no
+fi
+
+
+
+# Check whether --with-openssl was given.
+if test "${with_openssl+set}" = set; then :
+  withval=$with_openssl;
+  case $withval in
+    yes)
+      :
+      ;;
+    no)
+      :
+      ;;
+    *)
+      as_fn_error $? "no argument expected for --with-openssl option" "$LINENO" 5
+      ;;
+  esac
+
+else
+  with_openssl=no
+
+fi
+
+
 if test "$with_openssl" = yes ; then
+  with_ssl=openssl
+fi
+
+if test "$with_ssl" = openssl ; then
     # Minimum required OpenSSL version is 1.0.1
 
 $as_echo "#define OPENSSL_API_COMPAT 0x10001000L" >>confdefs.h
@@ -12440,8 +12466,280 @@ _ACEOF
 fi
 done
 
+
+$as_echo "#define USE_OPENSSL 1" >>confdefs.h
+
+elif test "$with_ssl" = nss ; then
+  # TODO: fallback in case nss-config/nspr-config aren't found.
+  if test -z "$NSS_CONFIG"; then
+  for ac_prog in nss-config
+do
+  # Extract the first word of "$ac_prog", so it can be a program name with args.
+set dummy $ac_prog; ac_word=$2
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
+$as_echo_n "checking for $ac_word... " >&6; }
+if ${ac_cv_path_NSS_CONFIG+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  case $NSS_CONFIG in
+  [\\/]* | ?:[\\/]*)
+  ac_cv_path_NSS_CONFIG="$NSS_CONFIG" # Let the user override the test with a path.
+  ;;
+  *)
+  as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH
+do
+  IFS=$as_save_IFS
+  test -z "$as_dir" && as_dir=.
+    for ac_exec_ext in '' $ac_executable_extensions; do
+  if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
+    ac_cv_path_NSS_CONFIG="$as_dir/$ac_word$ac_exec_ext"
+    $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
+    break 2
+  fi
+done
+  done
+IFS=$as_save_IFS
+
+  ;;
+esac
+fi
+NSS_CONFIG=$ac_cv_path_NSS_CONFIG
+if test -n "$NSS_CONFIG"; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $NSS_CONFIG" >&5
+$as_echo "$NSS_CONFIG" >&6; }
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
 fi
 
+
+  test -n "$NSS_CONFIG" && break
+done
+
+else
+  # Report the value of NSS_CONFIG in configure's output in all cases.
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for NSS_CONFIG" >&5
+$as_echo_n "checking for NSS_CONFIG... " >&6; }
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $NSS_CONFIG" >&5
+$as_echo "$NSS_CONFIG" >&6; }
+fi
+
+  if test -z "$NSPR_CONFIG"; then
+  for ac_prog in nspr-config
+do
+  # Extract the first word of "$ac_prog", so it can be a program name with args.
+set dummy $ac_prog; ac_word=$2
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
+$as_echo_n "checking for $ac_word... " >&6; }
+if ${ac_cv_path_NSPR_CONFIG+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  case $NSPR_CONFIG in
+  [\\/]* | ?:[\\/]*)
+  ac_cv_path_NSPR_CONFIG="$NSPR_CONFIG" # Let the user override the test with a path.
+  ;;
+  *)
+  as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH
+do
+  IFS=$as_save_IFS
+  test -z "$as_dir" && as_dir=.
+    for ac_exec_ext in '' $ac_executable_extensions; do
+  if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
+    ac_cv_path_NSPR_CONFIG="$as_dir/$ac_word$ac_exec_ext"
+    $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
+    break 2
+  fi
+done
+  done
+IFS=$as_save_IFS
+
+  ;;
+esac
+fi
+NSPR_CONFIG=$ac_cv_path_NSPR_CONFIG
+if test -n "$NSPR_CONFIG"; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $NSPR_CONFIG" >&5
+$as_echo "$NSPR_CONFIG" >&6; }
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+fi
+
+
+  test -n "$NSPR_CONFIG" && break
+done
+
+else
+  # Report the value of NSPR_CONFIG in configure's output in all cases.
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for NSPR_CONFIG" >&5
+$as_echo_n "checking for NSPR_CONFIG... " >&6; }
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $NSPR_CONFIG" >&5
+$as_echo "$NSPR_CONFIG" >&6; }
+fi
+
+  if test -n "$NSS_CONFIG"; then
+    NSS_LIBS=`$NSS_CONFIG --libs`
+	NSS_CFLAGS=`$NSS_CONFIG --cflags`
+  fi
+  if test -n "$NSPR_CONFIG"; then
+	NSPR_LIBS=`$NSPR_CONFIG --libs`
+	NSPR_CFLAGS=`$NSPR_CONFIG --cflags`
+  fi
+
+  LDFLAGS="$LDFLAGS $NSS_LIBS $NSPR_LIBS"
+  CFLAGS="$CFLAGS $NSS_CFLAGS $NSPR_CFLAGS"
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for SSL_VersionRangeSet in -lnss3" >&5
+$as_echo_n "checking for SSL_VersionRangeSet in -lnss3... " >&6; }
+if ${ac_cv_lib_nss3_SSL_VersionRangeSet+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lnss3  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char SSL_VersionRangeSet ();
+int
+main ()
+{
+return SSL_VersionRangeSet ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_lib_nss3_SSL_VersionRangeSet=yes
+else
+  ac_cv_lib_nss3_SSL_VersionRangeSet=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_nss3_SSL_VersionRangeSet" >&5
+$as_echo "$ac_cv_lib_nss3_SSL_VersionRangeSet" >&6; }
+if test "x$ac_cv_lib_nss3_SSL_VersionRangeSet" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_LIBNSS3 1
+_ACEOF
+
+  LIBS="-lnss3 $LIBS"
+
+else
+  as_fn_error $? "library 'nss3' is required for NSS" "$LINENO" 5
+fi
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for PR_GetDefaultIOMethods in -lnspr4" >&5
+$as_echo_n "checking for PR_GetDefaultIOMethods in -lnspr4... " >&6; }
+if ${ac_cv_lib_nspr4_PR_GetDefaultIOMethods+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lnspr4  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char PR_GetDefaultIOMethods ();
+int
+main ()
+{
+return PR_GetDefaultIOMethods ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_lib_nspr4_PR_GetDefaultIOMethods=yes
+else
+  ac_cv_lib_nspr4_PR_GetDefaultIOMethods=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_nspr4_PR_GetDefaultIOMethods" >&5
+$as_echo "$ac_cv_lib_nspr4_PR_GetDefaultIOMethods" >&6; }
+if test "x$ac_cv_lib_nspr4_PR_GetDefaultIOMethods" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_LIBNSPR4 1
+_ACEOF
+
+  LIBS="-lnspr4 $LIBS"
+
+else
+  as_fn_error $? "library 'nspr4' is required for NSS" "$LINENO" 5
+fi
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for SSL_GetImplementedCiphers in -lssl3" >&5
+$as_echo_n "checking for SSL_GetImplementedCiphers in -lssl3... " >&6; }
+if ${ac_cv_lib_ssl3_SSL_GetImplementedCiphers+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lssl3  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char SSL_GetImplementedCiphers ();
+int
+main ()
+{
+return SSL_GetImplementedCiphers ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_lib_ssl3_SSL_GetImplementedCiphers=yes
+else
+  ac_cv_lib_ssl3_SSL_GetImplementedCiphers=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_ssl3_SSL_GetImplementedCiphers" >&5
+$as_echo "$ac_cv_lib_ssl3_SSL_GetImplementedCiphers" >&6; }
+if test "x$ac_cv_lib_ssl3_SSL_GetImplementedCiphers" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_LIBSSL3 1
+_ACEOF
+
+  LIBS="-lssl3 $LIBS"
+
+else
+  as_fn_error $? "library 'ssl3' is required for NSS" "$LINENO" 5
+fi
+
+
+$as_echo "#define USE_NSS 1" >>confdefs.h
+
+elif test "$with_ssl" != no ; then
+  as_fn_error $? "--with-ssl must specify one of openssl or nss" "$LINENO" 5
+fi
+
+
 if test "$with_pam" = yes ; then
   { $as_echo "$as_me:${as_lineno-$LINENO}: checking for pam_start in -lpam" >&5
 $as_echo_n "checking for pam_start in -lpam... " >&6; }
@@ -13327,7 +13625,7 @@ done
 
 fi
 
-if test "$with_openssl" = yes ; then
+if test "$with_ssl" = openssl ; then
   ac_fn_c_check_header_mongrel "$LINENO" "openssl/ssl.h" "ac_cv_header_openssl_ssl_h" "$ac_includes_default"
 if test "x$ac_cv_header_openssl_ssl_h" = xyes; then :
 
@@ -13344,6 +13642,25 @@ else
 fi
 
 
+fi
+
+if test "$with_ssl" = nss ; then
+  ac_fn_c_check_header_mongrel "$LINENO" "nss/ssl.h" "ac_cv_header_nss_ssl_h" "$ac_includes_default"
+if test "x$ac_cv_header_nss_ssl_h" = xyes; then :
+
+else
+  as_fn_error $? "header file <nss/ssl.h> is required for NSS" "$LINENO" 5
+fi
+
+
+  ac_fn_c_check_header_mongrel "$LINENO" "nss/nss.h" "ac_cv_header_nss_nss_h" "$ac_includes_default"
+if test "x$ac_cv_header_nss_nss_h" = xyes; then :
+
+else
+  as_fn_error $? "header file <nss/nss.h> is required for NSS" "$LINENO" 5
+fi
+
+
 fi
 
 if test "$with_pam" = yes ; then
@@ -18061,11 +18378,13 @@ fi
 # in the template or configure command line.
 
 # If not selected manually, try to select a source automatically.
-if test x"$USE_OPENSSL_RANDOM" = x"" && test x"$USE_WIN32_RANDOM" = x"" && test x"$USE_DEV_URANDOM" = x"" ; then
-  if test x"$with_openssl" = x"yes" ; then
+if test x"$USE_OPENSSL_RANDOM" = x"" && test x"$USE_WIN32_RANDOM" = x"" && test x"$USE_DEV_URANDOM" = x"" && test x"$USE_NSS_RANDOM" = x"" ; then
+  if test x"$with_ssl" = x"openssl" ; then
     USE_OPENSSL_RANDOM=1
   elif test "$PORTNAME" = "win32" ; then
     USE_WIN32_RANDOM=1
+  elif test x"$with_ssl" = x"nss" ; then
+    USE_NSS_RANDOM=1
   else
     { $as_echo "$as_me:${as_lineno-$LINENO}: checking for /dev/urandom" >&5
 $as_echo_n "checking for /dev/urandom... " >&6; }
diff --git a/configure.ac b/configure.ac
index 5b91c83fd0..706c9862e7 100644
--- a/configure.ac
+++ b/configure.ac
@@ -852,15 +852,6 @@ PGAC_ARG_BOOL(with, bonjour, no,
 AC_MSG_RESULT([$with_bonjour])
 
 
-#
-# OpenSSL
-#
-AC_MSG_CHECKING([whether to build with OpenSSL support])
-PGAC_ARG_BOOL(with, openssl, no, [build with OpenSSL support],
-              [AC_DEFINE([USE_OPENSSL], 1, [Define to build with OpenSSL support. (--with-openssl)])])
-AC_MSG_RESULT([$with_openssl])
-AC_SUBST(with_openssl)
-
 #
 # SELinux
 #
@@ -1209,7 +1200,21 @@ if test "$with_gssapi" = yes ; then
   fi
 fi
 
+#
+# SSL Library
+#
+# There are currently two supported SSL/TLS libraries, OpenSSL and NSS.
+#
+PGAC_ARG_REQ(with, ssl, [LIB], [use LIB for SSL/TLS support (openssl, nss)])
+if test x"$with_ssl" = x"" ; then
+  with_ssl=no
+fi
+PGAC_ARG_BOOL(with, openssl, no, [obsolete spelling of --with-ssl=openssl])
 if test "$with_openssl" = yes ; then
+  with_ssl=openssl
+fi
+
+if test "$with_ssl" = openssl ; then
   dnl Order matters!
   # Minimum required OpenSSL version is 1.0.1
   AC_DEFINE(OPENSSL_API_COMPAT, [0x10001000L],
@@ -1233,7 +1238,31 @@ if test "$with_openssl" = yes ; then
   # thread-safety. In 1.1.0, it's no longer required, and CRYPTO_lock()
   # function was removed.
   AC_CHECK_FUNCS([CRYPTO_lock])
+  AC_DEFINE([USE_OPENSSL], 1, [Define to 1 if you have OpenSSL support.])
+elif test "$with_ssl" = nss ; then
+  # TODO: fallback in case nss-config/nspr-config aren't found.
+  PGAC_PATH_PROGS(NSS_CONFIG, nss-config)
+  PGAC_PATH_PROGS(NSPR_CONFIG, nspr-config)
+  if test -n "$NSS_CONFIG"; then
+    NSS_LIBS=`$NSS_CONFIG --libs`
+	NSS_CFLAGS=`$NSS_CONFIG --cflags`
+  fi
+  if test -n "$NSPR_CONFIG"; then
+	NSPR_LIBS=`$NSPR_CONFIG --libs`
+	NSPR_CFLAGS=`$NSPR_CONFIG --cflags`
+  fi
+
+  LDFLAGS="$LDFLAGS $NSS_LIBS $NSPR_LIBS"
+  CFLAGS="$CFLAGS $NSS_CFLAGS $NSPR_CFLAGS"
+
+  AC_CHECK_LIB(nss3, SSL_VersionRangeSet, [], [AC_MSG_ERROR([library 'nss3' is required for NSS])])
+  AC_CHECK_LIB(nspr4, PR_GetDefaultIOMethods, [], [AC_MSG_ERROR([library 'nspr4' is required for NSS])])
+  AC_CHECK_LIB(ssl3, SSL_GetImplementedCiphers, [], [AC_MSG_ERROR([library 'ssl3' is required for NSS])])
+  AC_DEFINE([USE_NSS], 1, [Define to 1 if you have NSS support,])
+elif test "$with_ssl" != no ; then
+  AC_MSG_ERROR([--with-ssl must specify one of openssl or nss])
 fi
+AC_SUBST(with_ssl)
 
 if test "$with_pam" = yes ; then
   AC_CHECK_LIB(pam,    pam_start, [], [AC_MSG_ERROR([library 'pam' is required for PAM])])
@@ -1405,11 +1434,16 @@ if test "$with_gssapi" = yes ; then
 	[AC_CHECK_HEADERS(gssapi.h, [], [AC_MSG_ERROR([gssapi.h header file is required for GSSAPI])])])
 fi
 
-if test "$with_openssl" = yes ; then
+if test "$with_ssl" = openssl ; then
   AC_CHECK_HEADER(openssl/ssl.h, [], [AC_MSG_ERROR([header file <openssl/ssl.h> is required for OpenSSL])])
   AC_CHECK_HEADER(openssl/err.h, [], [AC_MSG_ERROR([header file <openssl/err.h> is required for OpenSSL])])
 fi
 
+if test "$with_ssl" = nss ; then
+  AC_CHECK_HEADER(nss/ssl.h, [], [AC_MSG_ERROR([header file <nss/ssl.h> is required for NSS])])
+  AC_CHECK_HEADER(nss/nss.h, [], [AC_MSG_ERROR([header file <nss/nss.h> is required for NSS])])
+fi
+
 if test "$with_pam" = yes ; then
   AC_CHECK_HEADERS(security/pam_appl.h, [],
                    [AC_CHECK_HEADERS(pam/pam_appl.h, [],
@@ -2158,11 +2192,13 @@ fi
 # in the template or configure command line.
 
 # If not selected manually, try to select a source automatically.
-if test x"$USE_OPENSSL_RANDOM" = x"" && test x"$USE_WIN32_RANDOM" = x"" && test x"$USE_DEV_URANDOM" = x"" ; then
-  if test x"$with_openssl" = x"yes" ; then
+if test x"$USE_OPENSSL_RANDOM" = x"" && test x"$USE_WIN32_RANDOM" = x"" && test x"$USE_DEV_URANDOM" = x"" && test x"$USE_NSS_RANDOM" = x"" ; then
+  if test x"$with_ssl" = x"openssl" ; then
     USE_OPENSSL_RANDOM=1
   elif test "$PORTNAME" = "win32" ; then
     USE_WIN32_RANDOM=1
+  elif test x"$with_ssl" = x"nss" ; then
+    USE_NSS_RANDOM=1
   else
     AC_CHECK_FILE([/dev/urandom], [], [])
 
diff --git a/contrib/postgres_fdw/expected/postgres_fdw.out b/contrib/postgres_fdw/expected/postgres_fdw.out
index 2d88d06358..984efc0d7e 100644
--- a/contrib/postgres_fdw/expected/postgres_fdw.out
+++ b/contrib/postgres_fdw/expected/postgres_fdw.out
@@ -8911,7 +8911,7 @@ DO $d$
     END;
 $d$;
 ERROR:  invalid option "password"
-HINT:  Valid options in this context are: service, passfile, channel_binding, connect_timeout, dbname, host, hostaddr, port, options, application_name, keepalives, keepalives_idle, keepalives_interval, keepalives_count, tcp_user_timeout, sslmode, sslcompression, sslcert, sslkey, sslrootcert, sslcrl, requirepeer, ssl_min_protocol_version, ssl_max_protocol_version, gssencmode, krbsrvname, gsslib, target_session_attrs, use_remote_estimate, fdw_startup_cost, fdw_tuple_cost, extensions, updatable, fetch_size
+HINT:  Valid options in this context are: service, passfile, channel_binding, connect_timeout, dbname, host, hostaddr, port, options, application_name, keepalives, keepalives_idle, keepalives_interval, keepalives_count, tcp_user_timeout, sslmode, sslcompression, sslcert, sslkey, sslrootcert, sslcrl, requirepeer, ssl_min_protocol_version, ssl_max_protocol_version, gssencmode, krbsrvname, gsslib, target_session_attrs, cert_database, use_remote_estimate, fdw_startup_cost, fdw_tuple_cost, extensions, updatable, fetch_size
 CONTEXT:  SQL statement "ALTER SERVER loopback_nopw OPTIONS (ADD password 'dummypw')"
 PL/pgSQL function inline_code_block line 3 at EXECUTE
 -- If we add a password for our user mapping instead, we should get a different
diff --git a/src/Makefile.global.in b/src/Makefile.global.in
index 7ca1e9aac5..bdab2a6825 100644
--- a/src/Makefile.global.in
+++ b/src/Makefile.global.in
@@ -183,7 +183,7 @@ with_icu	= @with_icu@
 with_perl	= @with_perl@
 with_python	= @with_python@
 with_tcl	= @with_tcl@
-with_openssl	= @with_openssl@
+with_ssl	= @with_ssl@
 with_readline	= @with_readline@
 with_selinux	= @with_selinux@
 with_systemd	= @with_systemd@
diff --git a/src/backend/libpq/Makefile b/src/backend/libpq/Makefile
index efc5ef760a..045d2c2f6b 100644
--- a/src/backend/libpq/Makefile
+++ b/src/backend/libpq/Makefile
@@ -28,8 +28,12 @@ OBJS = \
 	pqmq.o \
 	pqsignal.o
 
-ifeq ($(with_openssl),yes)
+ifeq ($(with_ssl),openssl)
 OBJS += be-secure-openssl.o
+else
+ifeq ($(with_ssl),nss)
+OBJS += be-secure-nss.o
+endif
 endif
 
 ifeq ($(with_gssapi),yes)
diff --git a/src/backend/libpq/auth.c b/src/backend/libpq/auth.c
index d132c5cb48..d476101583 100644
--- a/src/backend/libpq/auth.c
+++ b/src/backend/libpq/auth.c
@@ -2870,7 +2870,14 @@ CheckCertAuth(Port *port)
 {
 	int			status_check_usermap = STATUS_ERROR;
 
+#if defined(USE_OPENSSL)
 	Assert(port->ssl);
+#elif defined(USE_NSS)
+	/* TODO: should we rename pr_fd to ssl, to keep consistency? */
+	Assert(port->pr_fd);
+#else
+	Assert(false);
+#endif
 
 	/* Make sure we have received a username in the certificate */
 	if (port->peer_cn == NULL ||
diff --git a/src/backend/libpq/be-secure-nss.c b/src/backend/libpq/be-secure-nss.c
new file mode 100644
index 0000000000..b26a4bd620
--- /dev/null
+++ b/src/backend/libpq/be-secure-nss.c
@@ -0,0 +1,1173 @@
+/*-------------------------------------------------------------------------
+ *
+ * be-secure-nss.c
+ *	  functions for supporting NSS as a TLS backend
+ *
+ *
+ * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ *	  src/backend/libpq/be-secure-nss.c
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#include "postgres.h"
+
+#include <sys/stat.h>
+
+/*
+ * BITS_PER_BYTE is also defined in the NSPR header files, so we need to undef
+ * our version to avoid compiler warnings on redefinition.
+ */
+#define pg_BITS_PER_BYTE BITS_PER_BYTE
+#undef BITS_PER_BYTE
+
+/*
+ * The nspr/obsolete/protypes.h NSPR header typedefs uint64 and int64 with
+ * colliding definitions from ours, causing a much expected compiler error.
+ * Remove backwards compatibility with ancient NSPR versions to avoid this.
+ */
+#define NO_NSPR_10_SUPPORT
+#include <nspr/nspr.h>
+#include <nspr/prerror.h>
+#include <nspr/prio.h>
+#include <nspr/prmem.h>
+#include <nspr/prtypes.h>
+
+#include <nss/nss.h>
+#include <nss/base64.h>
+#include <nss/cert.h>
+#include <nss/certdb.h>
+#include <nss/keyhi.h>
+#include <nss/pk11pub.h>
+#include <nss/secder.h>
+#include <nss/secerr.h>
+#include <nss/secitem.h>
+#include <nss/secport.h>
+#include <nss/ssl.h>
+#include <nss/sslerr.h>
+#include <nss/sslproto.h>
+
+/*
+ * Ensure that the colliding definitions match, else throw an error. In case
+ * NSPR has removed the definition for some reason, make sure to put ours
+ * back again.
+ */
+#if defined(BITS_PER_BYTE)
+#if BITS_PER_BYTE != pg_BITS_PER_BYTE
+#error "incompatible byte widths between NSPR and postgres"
+#endif
+#else
+#define BITS_PER_BYTE pg_BITS_PER_BYTE
+#endif
+#undef pg_BITS_PER_BYTE
+
+#include "common/pg_nss.h"
+#include "lib/stringinfo.h"
+#include "libpq/libpq.h"
+#include "nodes/pg_list.h"
+#include "miscadmin.h"
+#include "storage/fd.h"
+#include "utils/guc.h"
+#include "utils/memutils.h"
+
+
+/* default init hook can be overridden by a shared library */
+static void default_nss_tls_init(bool isServerStart);
+nss_tls_init_hook_type nss_tls_init_hook = default_nss_tls_init;
+
+static PRDescIdentity pr_id;
+
+static PRIOMethods pr_iomethods;
+static NSSInitContext * nss_context = NULL;
+static SSLVersionRange desired_sslver;
+
+static char *external_ssl_passphrase_cb(PK11SlotInfo *slot, PRBool retry, void *arg);
+static bool dummy_ssl_passwd_cb_called = false;
+static bool ssl_is_server_start;
+
+/*
+ * PR_ImportTCPSocket() is a private API, but very widely used, as it's the
+ * only way to make NSS use an already set up POSIX file descriptor rather
+ * than opening one itself. To quote the NSS documentation:
+ *
+ *		"In theory, code that uses PR_ImportTCPSocket may break when NSPR's
+ *		implementation changes. In practice, this is unlikely to happen because
+ *		NSPR's implementation has been stable for years and because of NSPR's
+ *		strong commitment to backward compatibility."
+ *
+ * https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSPR/Reference/PR_ImportTCPSocket
+ *
+ * The function is declared in <private/pprio.h>, but as it is a header marked
+ * private we declare it here rather than including it.
+ */
+NSPR_API(PRFileDesc *) PR_ImportTCPSocket(int);
+
+/* NSS IO layer callback overrides */
+static PRInt32 pg_ssl_read(PRFileDesc * fd, void *buf, PRInt32 amount,
+						   PRIntn flags, PRIntervalTime timeout);
+static PRInt32 pg_ssl_write(PRFileDesc * fd, const void *buf, PRInt32 amount,
+							PRIntn flags, PRIntervalTime timeout);
+/* Utility functions */
+static PRFileDesc * init_iolayer(Port *port);
+static uint16 ssl_protocol_version_to_nss(int v, const char *guc_name);
+
+static char *pg_SSLerrmessage(PRErrorCode errcode);
+static char *ssl_protocol_version_to_string(int v);
+static SECStatus pg_cert_auth_handler(void *arg, PRFileDesc * fd,
+									  PRBool checksig, PRBool isServer);
+static SECStatus pg_bad_cert_handler(void *arg, PRFileDesc * fd);
+static char *dummy_ssl_passphrase_cb(PK11SlotInfo * slot, PRBool retry, void *arg);
+
+/* ------------------------------------------------------------ */
+/*						 Public interface						*/
+/* ------------------------------------------------------------ */
+
+/*
+ * be_tls_init
+ *			Initialize the nss TLS library in the postmaster
+ *
+ * The majority of the setup needs to happen in be_tls_open_server since the
+ * NSPR initialization must happen after the forking of the backend. We could
+ * potentially move some parts in under !isServerStart, but so far this is the
+ * separation chosen.
+ */
+int
+be_tls_init(bool isServerStart)
+{
+	SECStatus	status;
+	SSLVersionRange supported_sslver;
+
+	/*
+	 * Set up the connection cache for multi-processing application behavior.
+	 * If we are in ServerStart then we initialize the cache. If the server is
+	 * already started, we inherit the cache such that it can be used for
+	 * connections. Calling SSL_ConfigMPServerSIDCache sets an environment
+	 * variable which contains enough information for the forked child to know
+	 * how to access it.  Passing NULL to SSL_InheritMPServerSIDCache will
+	 * make the forked child look it up by the default name SSL_INHERITANCE,
+	 * if env vars aren't inherited then the contents of the variable can be
+	 * passed instead.
+	 */
+	if (isServerStart)
+	{
+		/*
+		 * SSLv2 and SSLv3 are disabled in this TLS backend, but when setting
+		 * up the required session cache for NSS we still must supply timeout
+		 * values for v2 and The minimum allowed value for both is 5 seconds,
+		 * so opt for that in both cases (the defaults being 100 seconds and
+		 * 24 hours).
+		 *
+		 * Passing NULL as the directory for the session cache will default to
+		 * using /tmp on UNIX and \\temp on Windows.  Deciding if we want to
+		 * keep closer control on this directory is left as a TODO.
+		 */
+		status = SSL_ConfigMPServerSIDCache(MaxConnections, 5, 5, NULL);
+		if (status != SECSuccess)
+			ereport(FATAL,
+					(errmsg("unable to set up TLS connection cache: %s",
+							pg_SSLerrmessage(PR_GetError()))));
+
+	}
+	else
+	{
+		status = SSL_InheritMPServerSIDCache(NULL);
+		if (status != SECSuccess)
+		{
+			ereport(LOG,
+					(errmsg("unable to connect to TLS connection cache: %s",
+							pg_SSLerrmessage(PR_GetError()))));
+			return -1;
+		}
+	}
+
+	if (!ssl_database || strlen(ssl_database) == 0)
+	{
+		ereport(isServerStart ? FATAL : LOG,
+				(errmsg("no certificate database specified")));
+		goto error;
+	}
+
+	/*
+	 * We check for the desired TLS version range here, even though we cannot
+	 * set it until be_open_server such that we can be compatible with how the
+	 * OpenSSL backend reports errors for incompatible range configurations.
+	 * Set either the default supported TLS version range, or the configured
+	 * range from ssl_min_protocol_version and ssl_max_protocol version. In
+	 * case the user hasn't defined the maximum allowed version we fall back
+	 * to the highest version TLS that the library supports.
+	 */
+	if (SSL_VersionRangeGetSupported(ssl_variant_stream, &supported_sslver) != SECSuccess)
+	{
+		ereport(isServerStart ? FATAL : LOG,
+				(errmsg("unable to get default protocol support from NSS")));
+		goto error;
+	}
+
+	/*
+	 * Set the fallback versions for the TLS protocol version range to a
+	 * combination of our minimal requirement and the library maximum.
+	 */
+	desired_sslver.min = SSL_LIBRARY_VERSION_TLS_1_0;
+	desired_sslver.max = supported_sslver.max;
+
+	if (ssl_min_protocol_version)
+	{
+		int			ver = ssl_protocol_version_to_nss(ssl_min_protocol_version,
+													  "ssl_min_protocol_version");
+
+		if (ver == -1)
+		{
+			ereport(isServerStart ? FATAL : LOG,
+					(errmsg("\"%s\" setting \"%s\" not supported by this build",
+							"ssl_min_protocol_version",
+							GetConfigOption("ssl_min_protocol_version",
+											false, false))));
+			goto error;
+		}
+
+		if (ver > 0)
+			desired_sslver.min = ver;
+	}
+
+	if (ssl_max_protocol_version)
+	{
+		int			ver = ssl_protocol_version_to_nss(ssl_max_protocol_version,
+													  "ssl_max_protocol_version");
+
+		if (ver == -1)
+		{
+			ereport(isServerStart ? FATAL : LOG,
+					(errmsg("\"%s\" setting \"%s\" not supported by this build",
+							"ssl_max_protocol_version",
+							GetConfigOption("ssl_max_protocol_version",
+											false, false))));
+			goto error;
+		}
+		if (ver > 0)
+			desired_sslver.max = ver;
+
+		if (ver < desired_sslver.min)
+		{
+			ereport(isServerStart ? FATAL : LOG,
+					(errmsg("could not set SSL protocol version range"),
+					 errdetail("\"%s\" cannot be higher than \"%s\"",
+							   "ssl_min_protocol_version",
+							   "ssl_max_protocol_version")));
+			goto error;
+		}
+	}
+
+	/*
+	 * Set the passphrase callback which will be used both to obtain the
+	 * passphrase from the user, as well as by NSS to obtain the phrase
+	 * repeatedly.
+	 */
+	ssl_is_server_start = isServerStart;
+	(*nss_tls_init_hook) (isServerStart);
+
+	return 0;
+error:
+	return -1;
+}
+
+int
+be_tls_open_server(Port *port)
+{
+	SECStatus	status;
+	PRFileDesc *model;
+	PRFileDesc *pr_fd;
+	PRFileDesc *layer;
+	CERTCertificate *server_cert;
+	SECKEYPrivateKey *private_key;
+	CERTSignedCrl *crl;
+	SECItem		crlname;
+	char	   *cert_database;
+	NSSInitParameters params;
+
+	/*
+	 * The NSPR documentation states that runtime initialization via PR_Init
+	 * is no longer required, as the first caller into NSPR will perform the
+	 * initialization implicitly. The documentation doesn't however clarify
+	 * from which version this is holds true, so let's perform the potentially
+	 * superfluous initialization anyways to avoid crashing on older versions
+	 * of NSPR, as there is no difference in overhead.  The NSS documentation
+	 * still states that PR_Init must be called in some way (implicitly or
+	 * explicitly).
+	 *
+	 * The below parameters are what the implicit initialization would've done
+	 * for us, and should work even for older versions where it might not be
+	 * done automatically. The last parameter, maxPTDs, is set to various
+	 * values in other codebases, but has been unused since NSPR 2.1 which was
+	 * released sometime in 1998. In current versions of NSPR all parameters
+	 * are ignored.
+	 */
+	PR_Init(PR_USER_THREAD, PR_PRIORITY_NORMAL, 0 /* maxPTDs */ );
+
+	/*
+	 * The certificate path (configdir) must contain a valid NSS database. If
+	 * the certificate path isn't a valid directory, NSS will fall back on the
+	 * system certificate database. If the certificate path is a directory but
+	 * is empty then the initialization will fail. On the client side this can
+	 * be allowed for any sslmode but the verify-xxx ones.
+	 * https://bugzilla.redhat.com/show_bug.cgi?id=728562 For the server side
+	 * we wont allow this to fail however, as we require the certificate and
+	 * key to exist.
+	 *
+	 * The original design of NSS was for a single application to use a single
+	 * copy of it, initialized with NSS_Initialize() which isn't returning any
+	 * handle with which to refer to NSS. NSS initialization and shutdown are
+	 * global for the application, so a shutdown in another NSS enabled
+	 * library would cause NSS to be stopped for libpq as well.  The fix has
+	 * been to introduce NSS_InitContext which returns a context handle to
+	 * pass to NSS_ShutdownContext.  NSS_InitContext was introduced in NSS
+	 * 3.12, but the use of it is not very well documented.
+	 * https://bugzilla.redhat.com/show_bug.cgi?id=738456
+	 *
+	 * The InitParameters struct passed can be used to override internal
+	 * values in NSS, but the usage is not documented at all. When using
+	 * NSS_Init initializations, the values are instead set via PK11_Configure
+	 * calls so the PK11_Configure documentation can be used to glean some
+	 * details on these.
+	 *
+	 * https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS/PKCS11/Module_Specs
+	 */
+	memset(&params, '\0', sizeof(params));
+	params.length = sizeof(params);
+
+	if (!ssl_database || strlen(ssl_database) == 0)
+		ereport(FATAL,
+				(errmsg("no certificate database specified")));
+
+	cert_database = psprintf("sql:%s", ssl_database);
+	nss_context = NSS_InitContext(cert_database, "", "", "",
+								  &params,
+								  NSS_INIT_READONLY | NSS_INIT_PK11RELOAD);
+	pfree(cert_database);
+
+	if (!nss_context)
+		ereport(FATAL,
+				(errmsg("unable to read certificate database \"%s\": %s",
+						ssl_database, pg_SSLerrmessage(PR_GetError()))));
+
+	/*
+	 * Import the already opened socket as we don't want to use NSPR functions
+	 * for opening the network socket due to how the PostgreSQL protocol works
+	 * with TLS connections. This function is not part of the NSPR public API,
+	 * see the comment at the top of the file for the rationale of still using
+	 * it.
+	 */
+	pr_fd = PR_ImportTCPSocket(port->sock);
+	if (!pr_fd)
+		ereport(ERROR,
+				(errmsg("unable to connect to socket")));
+
+	/*
+	 * Most of the documentation available, and implementations of, NSS/NSPR
+	 * use the PR_NewTCPSocket() function here, which has the drawback that it
+	 * can only create IPv4 sockets. Instead use PR_OpenTCPSocket() which
+	 * copes with IPv6 as well.
+	 *
+	 * We use a model filedescriptor here which is a construct in NSPR/NSS in
+	 * order to create a configuration template for sockets which can then be
+	 * applied to new sockets created. This makes more sense in a server which
+	 * accepts multiple connections and want to perform the boilerplate just
+	 * once, but it does provide a nice abstraction here aswell in that we can
+	 * error out early without having performed any operation on the real
+	 * socket.
+	 */
+	model = PR_OpenTCPSocket(port->laddr.addr.ss_family);
+	if (!model)
+		ereport(ERROR,
+				(errmsg("unable to open socket")));
+
+	/*
+	 * Convert the NSPR socket to an SSL socket. Ensuring the success of this
+	 * operation is critical as NSS SSL_* functions may return SECSuccess on
+	 * the socket even though SSL hasn't been enabled, which introduce a risk
+	 * of silent downgrades.
+	 */
+	model = SSL_ImportFD(NULL, model);
+	if (!model)
+		ereport(ERROR,
+				(errmsg("unable to enable TLS on socket")));
+
+	/*
+	 * Configure basic settings for the connection over the SSL socket in
+	 * order to set it up as a server.
+	 */
+	if (SSL_OptionSet(model, SSL_SECURITY, PR_TRUE) != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to configure TLS connection")));
+
+	if (SSL_OptionSet(model, SSL_HANDSHAKE_AS_SERVER, PR_TRUE) != SECSuccess ||
+		SSL_OptionSet(model, SSL_HANDSHAKE_AS_CLIENT, PR_FALSE) != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to configure TLS connection as server")));
+
+	/*
+	 * SSLv2 is disabled by default, and SSLv3 will be excluded from the range
+	 * of allowed protocols further down. Since we really don't want these to
+	 * ever be enabled, let's use belts and suspenders and explicitly turn
+	 * them off as well.
+	 */
+	SSL_OptionSet(model, SSL_ENABLE_SSL2, PR_FALSE);
+	SSL_OptionSet(model, SSL_ENABLE_SSL3, PR_FALSE);
+
+#ifdef SSL_CBC_RANDOM_IV
+
+	/*
+	 * Enable protection against the BEAST attack in case the NSS server has
+	 * support for that. While SSLv3 is disabled, we may still allow TLSv1
+	 * which is affected. The option isn't documented as an SSL option, but as
+	 * an NSS environment variable.
+	 */
+	SSL_OptionSet(model, SSL_CBC_RANDOM_IV, PR_TRUE);
+#endif
+
+	/*
+	 * Configure the allowed ciphers. If there are no user preferred suites,
+	 * set the domestic policy.
+	 *
+	 * Historically there were different cipher policies based on export (and
+	 * import) restrictions: Domestic, Export and France. These are since long
+	 * removed with all ciphers being enabled by default. Due to backwards
+	 * compatibility, the old API is still used even though all three policies
+	 * now do the same thing.
+	 *
+	 * If SSLCipherSuites define a policy of the user, we set that rather than
+	 * enabling all ciphers via NSS_SetDomesticPolicy.
+	 *
+	 * TODO: while this code works, the set of ciphers which can be set and
+	 * still end up with a working socket is woefully underdocumented for
+	 * anything more recent than SSLv3 (the code for TLS actually calls ssl3
+	 * functions under the hood for SSL_CipherPrefSet), so it's unclear if this
+	 * is helpful or not. Using the policies works, but may be too coarsely
+	 * grained.
+	 *
+	 * Another TODO: The SSL_ImplementedCiphers table returned with calling
+	 * SSL_GetImplementedCiphers is sorted in server preference order. Sorting
+	 * SSLCipherSuites according to the order of the ciphers therein could be
+	 * a way to implement ssl_prefer_server_ciphers - if we at all want to use
+	 * cipher selection for NSS like how we do it for OpenSSL that is.
+	 */
+
+	/*
+	 * If no ciphers are specified, enable them all.
+	 */
+	if (!SSLCipherSuites || strlen(SSLCipherSuites) == 0)
+	{
+		status = NSS_SetDomesticPolicy();
+		if (status != SECSuccess)
+			ereport(ERROR,
+					(errmsg("unable to set cipher policy: %s",
+							pg_SSLerrmessage(PR_GetError()))));
+	}
+	else
+	{
+		char	   *ciphers,
+				   *c;
+
+		char	   *sep = ":;, ";
+		PRUint16	ciphercode;
+		const		PRUint16 *nss_ciphers;
+
+		/*
+		 * If the user has specified a set of preferred cipher suites we start
+		 * by turning off all the existing suites to avoid the risk of down-
+		 * grades to a weaker cipher than expected.
+		 */
+		nss_ciphers = SSL_GetImplementedCiphers();
+		for (int i = 0; i < SSL_GetNumImplementedCiphers(); i++)
+			SSL_CipherPrefSet(model, nss_ciphers[i], PR_FALSE);
+
+		ciphers = pstrdup(SSLCipherSuites);
+
+		for (c = strtok(ciphers, sep); c; c = strtok(NULL, sep))
+		{
+			ciphercode = pg_find_cipher(c);
+			if (ciphercode != INVALID_CIPHER)
+			{
+				status = SSL_CipherPrefSet(model, ciphercode, PR_TRUE);
+				if (status != SECSuccess)
+					ereport(ERROR,
+							(errmsg("invalid cipher-suite specified: %s", c)));
+			}
+		}
+
+		pfree(ciphers);
+	}
+
+	if (SSL_VersionRangeSet(model, &desired_sslver) != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to set requested SSL protocol version range")));
+
+	/*
+	 * Set up the custom IO layer.
+	 */
+	layer = init_iolayer(port);
+	if (!layer)
+		goto error;
+
+	/* Store the Port as private data available in callbacks */
+	layer->secret = (void *) port;
+
+	if (PR_PushIOLayer(pr_fd, PR_TOP_IO_LAYER, layer) != PR_SUCCESS)
+	{
+		PR_Close(layer);
+		ereport(ERROR,
+				(errmsg("unable to push IO layer")));
+	}
+
+	server_cert = PK11_FindCertFromNickname(ssl_cert_file, (void *) port);
+	if (!server_cert)
+	{
+		if (dummy_ssl_passwd_cb_called)
+			ereport(ERROR,
+					(errmsg("unable to load certificate for \"%s\": %s",
+							ssl_cert_file, pg_SSLerrmessage(PR_GetError())),
+					 errhint("The certificate requires a password.")));
+		else
+			ereport(ERROR,
+					(errmsg("unable to find certificate for \"%s\": %s",
+							ssl_cert_file, pg_SSLerrmessage(PR_GetError()))));
+	}
+
+	private_key = PK11_FindKeyByAnyCert(server_cert, (void *) port);
+	if (!private_key)
+	{
+		if (dummy_ssl_passwd_cb_called)
+			ereport(ERROR,
+					(errmsg("unable to load private key for \"%s\": %s",
+							ssl_cert_file, pg_SSLerrmessage(PR_GetError())),
+					 errhint("The private key requires a password.")));
+		else
+			ereport(ERROR,
+					(errmsg("unable to find private key for \"%s\": %s",
+							ssl_cert_file, pg_SSLerrmessage(PR_GetError()))));
+	}
+
+	/*
+	 * NSS doesn't use CRL files on disk, so we use the ssl_crl_file guc to
+	 * contain the CRL nickname for the current server certificate in the NSS
+	 * certificate database. The main difference from the OpenSSL backend is
+	 * that NSS will use the CRL regardless, but being able to make sure the
+	 * CRL is loaded seems like a good feature.
+	 */
+	if (ssl_crl_file[0])
+	{
+		SECITEM_CopyItem(NULL, &crlname, &server_cert->derSubject);
+		crl = SEC_FindCrlByName(CERT_GetDefaultCertDB(), &crlname, SEC_CRL_TYPE);
+		if (!crl)
+			ereport(ERROR,
+					(errmsg("specified CRL not found in database")));
+		SEC_DestroyCrl(crl);
+	}
+
+	/*
+	 * Finally we must configure the socket for being a server by setting the
+	 * certificate and key. The NULL parameter is an SSLExtraServerCertData
+	 * pointer with the final parameter being the size of the extra server
+	 * cert data structure pointed to. This is typically only used for
+	 * credential delegation.
+	 */
+	status = SSL_ConfigServerCert(model, server_cert, private_key, NULL, 0);
+	if (status != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to configure server for TLS server connections: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+
+	ssl_loaded_verify_locations = true;
+
+	/*
+	 * At this point, we no longer have use for the certificate and private
+	 * key as they have been copied into the context by NSS. Destroy our
+	 * copies explicitly to clean out the memory as best we can.
+	 */
+	CERT_DestroyCertificate(server_cert);
+	SECKEY_DestroyPrivateKey(private_key);
+
+	status = SSL_AuthCertificateHook(model, pg_cert_auth_handler, (void *) port);
+	if (status != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to install authcert hook: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+	SSL_BadCertHook(model, pg_bad_cert_handler, (void *) port);
+	SSL_OptionSet(model, SSL_REQUEST_CERTIFICATE, PR_TRUE);
+	SSL_OptionSet(model, SSL_REQUIRE_CERTIFICATE, PR_FALSE);
+
+	port->pr_fd = SSL_ImportFD(model, pr_fd);
+	if (!port->pr_fd)
+		ereport(ERROR,
+				(errmsg("unable to initialize")));
+
+	PR_Close(model);
+
+	/*
+	 * Force a handshake on the next I/O request, the second parameter means
+	 * that we are a server, PR_FALSE would indicate being a client. NSPR
+	 * requires us to call SSL_ResetHandshake since we imported an already
+	 * established socket.
+	 */
+	status = SSL_ResetHandshake(port->pr_fd, PR_TRUE);
+	if (status != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to initiate handshake: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+	status = SSL_ForceHandshake(port->pr_fd);
+	if (status != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to handshake: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+
+	port->ssl_in_use = true;
+	return 0;
+
+error:
+	return 1;
+}
+
+ssize_t
+be_tls_read(Port *port, void *ptr, size_t len, int *waitfor)
+{
+	ssize_t		n_read;
+	PRErrorCode err;
+
+	n_read = PR_Read(port->pr_fd, ptr, len);
+
+	if (n_read < 0)
+	{
+		err = PR_GetError();
+
+		if (err == PR_WOULD_BLOCK_ERROR)
+		{
+			*waitfor = WL_SOCKET_READABLE;
+			errno = EWOULDBLOCK;
+		}
+		else
+			errno = ECONNRESET;
+	}
+
+	return n_read;
+}
+
+ssize_t
+be_tls_write(Port *port, void *ptr, size_t len, int *waitfor)
+{
+	ssize_t		n_write;
+	PRErrorCode err;
+	PRIntn		flags = 0;
+
+	/*
+	 * The flags parameter to PR_Send is no longer used and is, according to
+	 * the documentation, required to be zero.
+	 */
+	n_write = PR_Send(port->pr_fd, ptr, len, flags, PR_INTERVAL_NO_WAIT);
+
+	if (n_write < 0)
+	{
+		err = PR_GetError();
+
+		if (err == PR_WOULD_BLOCK_ERROR)
+		{
+			*waitfor = WL_SOCKET_WRITEABLE;
+			errno = EWOULDBLOCK;
+		}
+		else
+			errno = ECONNRESET;
+	}
+
+	return n_write;
+}
+
+void
+be_tls_close(Port *port)
+{
+	if (!port)
+		return;
+
+	if (port->peer_cn)
+	{
+		SSL_InvalidateSession(port->pr_fd);
+		pfree(port->peer_cn);
+		port->peer_cn = NULL;
+	}
+
+	PR_Close(port->pr_fd);
+	port->pr_fd = NULL;
+	port->ssl_in_use = false;
+
+	if (nss_context)
+	{
+		NSS_ShutdownContext(nss_context);
+		nss_context = NULL;
+	}
+}
+
+void
+be_tls_destroy(void)
+{
+	/*
+	 * It reads a bit odd to clear a session cache when we are destroying the
+	 * context altogether, but if the session cache isn't cleared before
+	 * shutting down the context it will fail with SEC_ERROR_BUSY.
+	 */
+	SSL_ClearSessionCache();
+}
+
+int
+be_tls_get_cipher_bits(Port *port)
+{
+	SECStatus	status;
+	SSLChannelInfo channel;
+	SSLCipherSuiteInfo suite;
+
+	status = SSL_GetChannelInfo(port->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+		goto error;
+
+	status = SSL_GetCipherSuiteInfo(channel.cipherSuite, &suite, sizeof(suite));
+	if (status != SECSuccess)
+		goto error;
+
+	return suite.effectiveKeyBits;
+
+error:
+	ereport(WARNING,
+			(errmsg("unable to extract TLS session information: %s",
+					pg_SSLerrmessage(PR_GetError()))));
+	return 0;
+}
+
+/*
+ * be_tls_get_compression
+ *
+ * NSS disabled support for TLS compression in version 3.33 and removed the
+ * code in a subsequent release. The API for retrieving information about
+ * compression as well as enabling it is kept for backwards compatibility, but
+ * we don't need to consult it since it was only available for SSLv3 which we
+ * don't support.
+ *
+ * https://bugzilla.mozilla.org/show_bug.cgi?id=1409587
+ */
+bool
+be_tls_get_compression(Port *port)
+{
+	return false;
+}
+
+/*
+ * be_tls_get_version
+ *
+ * Returns the protocol version used for the current connection, or NULL in
+ * case of errors.
+ */
+const char *
+be_tls_get_version(Port *port)
+{
+	SECStatus	status;
+	SSLChannelInfo channel;
+
+	status = SSL_GetChannelInfo(port->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+	{
+		ereport(WARNING,
+				(errmsg("unable to extract TLS session information: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+		return NULL;
+	}
+
+	return ssl_protocol_version_to_string(channel.protocolVersion);
+}
+
+const char *
+be_tls_get_cipher(Port *port)
+{
+	SECStatus	status;
+	SSLChannelInfo channel;
+	SSLCipherSuiteInfo suite;
+
+	status = SSL_GetChannelInfo(port->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+		goto error;
+
+	status = SSL_GetCipherSuiteInfo(channel.cipherSuite, &suite, sizeof(suite));
+	if (status != SECSuccess)
+		goto error;
+
+	return suite.cipherSuiteName;
+
+error:
+	ereport(WARNING,
+			(errmsg("unable to extract TLS session information: %s",
+					pg_SSLerrmessage(PR_GetError()))));
+	return NULL;
+}
+
+void
+be_tls_get_peer_subject_name(Port *port, char *ptr, size_t len)
+{
+	CERTCertificate *certificate;
+
+	certificate = SSL_PeerCertificate(port->pr_fd);
+	if (certificate)
+		strlcpy(ptr, CERT_NameToAscii(&certificate->subject), len);
+	else
+		ptr[0] = '\0';
+}
+
+void
+be_tls_get_peer_issuer_name(Port *port, char *ptr, size_t len)
+{
+	CERTCertificate *certificate;
+
+	certificate = SSL_PeerCertificate(port->pr_fd);
+	if (certificate)
+		strlcpy(ptr, CERT_NameToAscii(&certificate->issuer), len);
+	else
+		ptr[0] = '\0';
+}
+
+void
+be_tls_get_peer_serial(Port *port, char *ptr, size_t len)
+{
+	CERTCertificate *certificate;
+
+	certificate = SSL_PeerCertificate(port->pr_fd);
+	if (certificate)
+		snprintf(ptr, len, "%li", DER_GetInteger(&(certificate->serialNumber)));
+	else
+		ptr[0] = '\0';
+}
+
+/* ------------------------------------------------------------ */
+/*						Internal functions						*/
+/* ------------------------------------------------------------ */
+
+/*
+ * default_nss_tls_init
+ *
+ * The default TLS init hook function which users can override for installing
+ * their own passphrase callbacks and similar actions. In case no callback has
+ * been configured, or the callback isn't reload capable during a server
+ * reload, the dummy callback will be installed.
+ *
+ * The private data for the callback is set differently depending on how it's
+ * invoked. For calls which may invoke the callback deeper in the callstack
+ * the private data is set with SSL_SetPKCS11PinArg. When the call is directly
+ * invoking the callback, like PK11_FindCertFromNickname, then the private
+ * data is passed as a parameter. Setting the data with SSL_SetPKCS11PinArg is
+ * thus not required but good practice.
+ *
+ * NSS doesn't provide a default callback like OpenSSL does, but a callback is
+ * required to be set.  The password callback can be installed at any time, but
+ * setting the private data with SSL_SetPKCS11PinArg requires a PR Filedesc.
+ */
+static void
+default_nss_tls_init(bool isServerStart)
+{
+	/*
+	 * No user-defined callback has been configured, install the dummy call-
+	 * back since we must set something.
+	 */
+	if (!ssl_passphrase_command[0])
+		PK11_SetPasswordFunc(dummy_ssl_passphrase_cb);
+	else
+	{
+		/*
+		 * There is a user-defined callback, set it unless we are in a restart
+		 * and cannot handle restarts due to an interactive callback.
+		 */
+		if (isServerStart)
+			PK11_SetPasswordFunc(external_ssl_passphrase_cb);
+		else
+		{
+			if (ssl_passphrase_command_supports_reload)
+				PK11_SetPasswordFunc(external_ssl_passphrase_cb);
+			else
+				PK11_SetPasswordFunc(dummy_ssl_passphrase_cb);
+		}
+	}
+}
+
+/*
+ * external_ssl_passphrase_cb
+ *
+ * Runs the callback configured by ssl_passphrase_command and returns the
+ * captured password back to NSS.
+ */
+static char *
+external_ssl_passphrase_cb(PK11SlotInfo *slot, PRBool retry, void *arg)
+{
+	/*
+	 * NSS use a hardcoded 256 byte buffer for reading the password so set the
+	 * same limit for our callback buffer.
+	 */
+	char		buf[256];
+	int			len;
+	char	   *password = NULL;
+	char	   *prompt;
+
+	/*
+	 * Since there is no password callback in NSS when the server starts up,
+	 * it makes little sense to create an interactive callback. Thus, if this
+	 * is a retry attempt then give up immediately.
+	 */
+	if (retry)
+		return NULL;
+
+	/*
+	 * Construct the same prompt that NSS uses internally even though it is
+	 * unlikely to serve much purpose, but we must set a prompt so we might
+	 * as well do it right.
+	 */
+	prompt = psprintf("Enter Password or Pin for \"%s\":",
+					  PK11_GetTokenName(slot));
+
+	len = run_ssl_passphrase_command(prompt, ssl_is_server_start, buf, sizeof(buf));
+	pfree(prompt);
+
+	if (!len)
+		return NULL;
+
+	/*
+	 * At least one byte with password content was returned, and NSS requires
+	 * that we return it allocated in NSS controlled memory. If we fail to
+	 * allocate then abort without passing back NULL and bubble up the error
+	 * on the PG side.
+	 */
+	password = (char *) PR_Malloc(len + 1);
+	if (!password)
+	{
+		explicit_bzero(buf, sizeof(buf));
+		ereport(ERROR,
+				(errcode(ERRCODE_OUT_OF_MEMORY),
+				 errmsg("out of memory")));
+	}
+	strlcpy(password, buf, sizeof(password));
+	explicit_bzero(buf, sizeof(buf));
+
+	return password;
+}
+
+/*
+ * dummy_ssl_passphrase_cb
+ *
+ * Return unsuccessful if we are asked to provide the passphrase for a cert or
+ * key, without having a passphrase callback installed.
+ */
+static char *
+dummy_ssl_passphrase_cb(PK11SlotInfo *slot, PRBool retry, void *arg)
+{
+	dummy_ssl_passwd_cb_called = true;
+	return NULL;
+}
+
+static SECStatus
+pg_bad_cert_handler(void *arg, PRFileDesc * fd)
+{
+	Port	   *port = (Port *) arg;
+
+	port->peer_cert_valid = false;
+	return SECFailure;
+}
+
+static SECStatus
+pg_cert_auth_handler(void *arg, PRFileDesc * fd, PRBool checksig, PRBool isServer)
+{
+	SECStatus	status;
+	Port	   *port = (Port *) arg;
+	CERTCertificate *cert;
+	char	   *peer_cn;
+	int			len;
+
+	status = SSL_AuthCertificate(CERT_GetDefaultCertDB(), port->pr_fd, checksig, PR_TRUE);
+	if (status == SECSuccess)
+	{
+		cert = SSL_PeerCertificate(port->pr_fd);
+		len = strlen(cert->subjectName);
+		peer_cn = MemoryContextAllocZero(TopMemoryContext, len + 1);
+		/*
+		 * Skip over the key= portion of the key=value containing the the
+		 * peer CN.
+		 */
+		if (strncmp(cert->subjectName, "CN=", 3) == 0)
+			strlcpy(peer_cn, cert->subjectName + strlen("CN="), len + 1);
+		else
+			strlcpy(peer_cn, cert->subjectName, len + 1);
+		CERT_DestroyCertificate(cert);
+
+		port->peer_cn = peer_cn;
+		port->peer_cert_valid = true;
+	}
+
+	return status;
+}
+
+static PRInt32
+pg_ssl_read(PRFileDesc *fd, void *buf, PRInt32 amount, PRIntn flags,
+			PRIntervalTime timeout)
+{
+	PRRecvFN	read_fn;
+	PRInt32		n_read;
+
+	read_fn = fd->lower->methods->recv;
+	n_read = read_fn(fd->lower, buf, amount, flags, timeout);
+
+	return n_read;
+}
+
+static PRInt32
+pg_ssl_write(PRFileDesc *fd, const void *buf, PRInt32 amount, PRIntn flags,
+			 PRIntervalTime timeout)
+{
+	PRSendFN	send_fn;
+	PRInt32		n_write;
+
+	send_fn = fd->lower->methods->send;
+	n_write = send_fn(fd->lower, buf, amount, flags, timeout);
+
+	return n_write;
+}
+
+static PRFileDesc *
+init_iolayer(Port *port)
+{
+	const		PRIOMethods *default_methods;
+	PRFileDesc *layer;
+
+	/*
+	 * Start by initializing our layer with all the default methods so that we
+	 * can selectively override the ones we want while still ensuring that we
+	 * have a complete layer specification.
+	 */
+	default_methods = PR_GetDefaultIOMethods();
+	memcpy(&pr_iomethods, default_methods, sizeof(PRIOMethods));
+
+	pr_iomethods.recv = pg_ssl_read;
+	pr_iomethods.send = pg_ssl_write;
+
+	/*
+	 * Each IO layer must be identified by a unique name, where uniqueness is
+	 * per connection. Each connection in a postgres cluster can generate the
+	 * identity from the same string as they will create their IO layers on
+	 * different sockets. Only one layer per socket can have the same name.
+	 */
+	pr_id = PR_GetUniqueIdentity("PostgreSQL Server");
+	if (pr_id == PR_INVALID_IO_LAYER)
+	{
+		ereport(ERROR,
+				(errmsg("out of memory when setting up TLS connection")));
+		return NULL;
+	}
+
+	/*
+	 * Create the actual IO layer as a stub such that it can be pushed onto
+	 * the layer stack. The step via a stub is required as we define custom
+	 * callbacks.
+	 */
+	layer = PR_CreateIOLayerStub(pr_id, &pr_iomethods);
+	if (!layer)
+	{
+		ereport(ERROR,
+				(errmsg("unable to create NSS I/O layer")));
+		return NULL;
+	}
+
+	return layer;
+}
+
+static char *
+ssl_protocol_version_to_string(int v)
+{
+	switch (v)
+	{
+			/* SSL v2 and v3 are not supported */
+		case SSL_LIBRARY_VERSION_2:
+		case SSL_LIBRARY_VERSION_3_0:
+			Assert(false);
+			break;
+
+		case SSL_LIBRARY_VERSION_TLS_1_0:
+			return pstrdup("TLSv1.0");
+		case SSL_LIBRARY_VERSION_TLS_1_1:
+			return pstrdup("TLSv1.1");
+		case SSL_LIBRARY_VERSION_TLS_1_2:
+			return pstrdup("TLSv1.2");
+		case SSL_LIBRARY_VERSION_TLS_1_3:
+			return pstrdup("TLSv1.3");
+	}
+
+	return pstrdup("unknown");
+}
+
+
+/*
+ * ssl_protocol_version_to_nss
+ *			Translate PostgreSQL TLS version to NSS version
+ *
+ * Returns zero in case the requested TLS version is undefined (PG_ANY) and
+ * should be set by the caller, or -1 on failure.
+ */
+static uint16
+ssl_protocol_version_to_nss(int v, const char *guc_name)
+{
+	switch (v)
+	{
+			/*
+			 * There is no SSL_LIBRARY_ macro defined in NSS with the value
+			 * zero, so we use this to signal the caller that the highest
+			 * useful version should be set on the connection.
+			 */
+		case PG_TLS_ANY:
+			return 0;
+
+			/*
+			 * No guard is required here as there are no versions of NSS
+			 * without support for TLS1.
+			 */
+		case PG_TLS1_VERSION:
+			return SSL_LIBRARY_VERSION_TLS_1_0;
+		case PG_TLS1_1_VERSION:
+#ifdef SSL_LIBRARY_VERSION_TLS_1_1
+			return SSL_LIBRARY_VERSION_TLS_1_1;
+#else
+			break;
+#endif
+		case PG_TLS1_2_VERSION:
+#ifdef SSL_LIBRARY_VERSION_TLS_1_2
+			return SSL_LIBRARY_VERSION_TLS_1_2;
+#else
+			break;
+#endif
+		case PG_TLS1_3_VERSION:
+#ifdef SSL_LIBRARY_VERSION_TLS_1_3
+			return SSL_LIBRARY_VERSION_TLS_1_3;
+#else
+			break;
+#endif
+		default:
+			break;
+	}
+
+	return -1;
+}
+
+/*
+ * pg_SSLerrmessage
+ *		Create and return a human readable error message given
+ *		the specified error code
+ *
+ * PR_ErrorToName only converts the enum identifier of the error to string,
+ * but that can be quite useful for debugging (and in case PR_ErrorToString is
+ * unable to render a message then we at least have something).
+ */
+static char *
+pg_SSLerrmessage(PRErrorCode errcode)
+{
+	return psprintf("%s (%s)",
+					PR_ErrorToString(errcode, PR_LANGUAGE_I_DEFAULT),
+					PR_ErrorToName(errcode));
+}
diff --git a/src/backend/libpq/be-secure.c b/src/backend/libpq/be-secure.c
index 2ae507a902..f39977b80c 100644
--- a/src/backend/libpq/be-secure.c
+++ b/src/backend/libpq/be-secure.c
@@ -49,6 +49,9 @@ bool		ssl_passphrase_command_supports_reload;
 #ifdef USE_SSL
 bool		ssl_loaded_verify_locations = false;
 #endif
+#ifdef USE_NSS
+char	   *ssl_database;
+#endif
 
 /* GUC variable controlling SSL cipher list */
 char	   *SSLCipherSuites = NULL;
diff --git a/src/backend/libpq/hba.c b/src/backend/libpq/hba.c
index 4c86fb6087..8821c60a34 100644
--- a/src/backend/libpq/hba.c
+++ b/src/backend/libpq/hba.c
@@ -1040,7 +1040,7 @@ parse_hba_line(TokenizedLine *tok_line, int elevel)
 			ereport(elevel,
 					(errcode(ERRCODE_CONFIG_FILE_ERROR),
 					 errmsg("hostssl record cannot match because SSL is not supported by this build"),
-					 errhint("Compile with --with-openssl to use SSL connections."),
+					 errhint("Compile with --with-openssl or --with-nss to use SSL connections."),
 					 errcontext("line %d of configuration file \"%s\"",
 								line_num, HbaFileName)));
 			*err_msg = "hostssl record cannot match because SSL is not supported by this build";
diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c
index a62d64eaa4..050f673c68 100644
--- a/src/backend/utils/misc/guc.c
+++ b/src/backend/utils/misc/guc.c
@@ -4262,7 +4262,11 @@ static struct config_string ConfigureNamesString[] =
 		},
 		&ssl_library,
 #ifdef USE_SSL
+#if defined(USE_OPENSSL)
 		"OpenSSL",
+#elif defined(USE_NSS)
+		"NSS",
+#endif
 #else
 		"",
 #endif
@@ -4320,6 +4324,18 @@ static struct config_string ConfigureNamesString[] =
 		check_canonical_path, assign_pgstat_temp_directory, NULL
 	},
 
+#ifdef USE_NSS
+	{
+		{"ssl_database", PGC_SIGHUP, CONN_AUTH_SSL,
+			gettext_noop("Location of the NSS certificate database."),
+			NULL
+		},
+		&ssl_database,
+		"",
+		NULL, NULL, NULL
+	},
+#endif
+
 	{
 		{"synchronous_standby_names", PGC_SIGHUP, REPLICATION_PRIMARY,
 			gettext_noop("Number of synchronous standbys and list of names of potential synchronous ones."),
@@ -4348,8 +4364,10 @@ static struct config_string ConfigureNamesString[] =
 			GUC_SUPERUSER_ONLY
 		},
 		&SSLCipherSuites,
-#ifdef USE_OPENSSL
+#if defined(USE_OPENSSL)
 		"HIGH:MEDIUM:+3DES:!aNULL",
+#elif defined (USE_NSS)
+		"",
 #else
 		"none",
 #endif
diff --git a/src/common/Makefile b/src/common/Makefile
index 25c55bd642..614f93af09 100644
--- a/src/common/Makefile
+++ b/src/common/Makefile
@@ -79,7 +79,7 @@ OBJS_COMMON = \
 	wait_error.o \
 	wchar.o
 
-ifeq ($(with_openssl),yes)
+ifeq ($(with_ssl),openssl)
 OBJS_COMMON += \
 	protocol_openssl.o \
 	sha2_openssl.o
diff --git a/src/include/common/pg_nss.h b/src/include/common/pg_nss.h
new file mode 100644
index 0000000000..9205f0fc3b
--- /dev/null
+++ b/src/include/common/pg_nss.h
@@ -0,0 +1,141 @@
+/*-------------------------------------------------------------------------
+ *
+ * pg_nss.h
+ *	  Support for NSS as a TLS backend
+ *
+ * These definitions are used by both frontend and backend code.
+ *
+ * Copyright (c) 2020, PostgreSQL Global Development Group
+ *
+ * IDENTIFICATION
+ *        src/include/common/pg_nss.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef PG_NSS_H
+#define PG_NSS_H
+
+#ifdef USE_NSS
+
+#include <nss/sslproto.h>
+
+PRUint16	pg_find_cipher(char *name);
+
+typedef struct
+{
+	const char *name;
+	PRUint16	number;
+}			NSSCiphers;
+
+#define INVALID_CIPHER	0xFFFF
+
+/*
+ * This list is a partial copy of the ciphers in NSS files lib/ssl/sslproto.h
+ * in order to provide a human readable version of the ciphers. It would be
+ * nice to not have to have this, but NSS doesn't provide any API addressing
+ * the ciphers by name. TODO: do we want more of the ciphers, or perhaps less?
+ */
+static const NSSCiphers NSS_CipherList[] = {
+
+	{"TLS_NULL_WITH_NULL_NULL", TLS_NULL_WITH_NULL_NULL},
+
+	{"TLS_RSA_WITH_NULL_MD5", TLS_RSA_WITH_NULL_MD5},
+	{"TLS_RSA_WITH_NULL_SHA", TLS_RSA_WITH_NULL_SHA},
+	{"TLS_RSA_WITH_RC4_128_MD5", TLS_RSA_WITH_RC4_128_MD5},
+	{"TLS_RSA_WITH_RC4_128_SHA", TLS_RSA_WITH_RC4_128_SHA},
+	{"TLS_RSA_WITH_IDEA_CBC_SHA", TLS_RSA_WITH_IDEA_CBC_SHA},
+	{"TLS_RSA_WITH_DES_CBC_SHA", TLS_RSA_WITH_DES_CBC_SHA},
+	{"TLS_RSA_WITH_3DES_EDE_CBC_SHA", TLS_RSA_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_DH_DSS_WITH_DES_CBC_SHA", TLS_DH_DSS_WITH_DES_CBC_SHA},
+	{"TLS_DH_DSS_WITH_3DES_EDE_CBC_SHA", TLS_DH_DSS_WITH_3DES_EDE_CBC_SHA},
+	{"TLS_DH_RSA_WITH_DES_CBC_SHA", TLS_DH_RSA_WITH_DES_CBC_SHA},
+	{"TLS_DH_RSA_WITH_3DES_EDE_CBC_SHA", TLS_DH_RSA_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_DHE_DSS_WITH_DES_CBC_SHA", TLS_DHE_DSS_WITH_DES_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_3DES_EDE_CBC_SHA", TLS_DHE_DSS_WITH_3DES_EDE_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_DES_CBC_SHA", TLS_DHE_RSA_WITH_DES_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA", TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_DH_anon_WITH_RC4_128_MD5", TLS_DH_anon_WITH_RC4_128_MD5},
+	{"TLS_DH_anon_WITH_DES_CBC_SHA", TLS_DH_anon_WITH_DES_CBC_SHA},
+	{"TLS_DH_anon_WITH_3DES_EDE_CBC_SHA", TLS_DH_anon_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_RSA_WITH_AES_128_CBC_SHA", TLS_RSA_WITH_AES_128_CBC_SHA},
+	{"TLS_DH_DSS_WITH_AES_128_CBC_SHA", TLS_DH_DSS_WITH_AES_128_CBC_SHA},
+	{"TLS_DH_RSA_WITH_AES_128_CBC_SHA", TLS_DH_RSA_WITH_AES_128_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_AES_128_CBC_SHA", TLS_DHE_DSS_WITH_AES_128_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_AES_128_CBC_SHA", TLS_DHE_RSA_WITH_AES_128_CBC_SHA},
+	{"TLS_DH_anon_WITH_AES_128_CBC_SHA", TLS_DH_anon_WITH_AES_128_CBC_SHA},
+
+	{"TLS_RSA_WITH_AES_256_CBC_SHA", TLS_RSA_WITH_AES_256_CBC_SHA},
+	{"TLS_DH_DSS_WITH_AES_256_CBC_SHA", TLS_DH_DSS_WITH_AES_256_CBC_SHA},
+	{"TLS_DH_RSA_WITH_AES_256_CBC_SHA", TLS_DH_RSA_WITH_AES_256_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_AES_256_CBC_SHA", TLS_DHE_DSS_WITH_AES_256_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_AES_256_CBC_SHA", TLS_DHE_RSA_WITH_AES_256_CBC_SHA},
+	{"TLS_DH_anon_WITH_AES_256_CBC_SHA", TLS_DH_anon_WITH_AES_256_CBC_SHA},
+	{"TLS_RSA_WITH_NULL_SHA256", TLS_RSA_WITH_NULL_SHA256},
+	{"TLS_RSA_WITH_AES_128_CBC_SHA256", TLS_RSA_WITH_AES_128_CBC_SHA256},
+	{"TLS_RSA_WITH_AES_256_CBC_SHA256", TLS_RSA_WITH_AES_256_CBC_SHA256},
+
+	{"TLS_DHE_DSS_WITH_AES_128_CBC_SHA256", TLS_DHE_DSS_WITH_AES_128_CBC_SHA256},
+	{"TLS_RSA_WITH_CAMELLIA_128_CBC_SHA", TLS_RSA_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DH_DSS_WITH_CAMELLIA_128_CBC_SHA", TLS_DH_DSS_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DH_RSA_WITH_CAMELLIA_128_CBC_SHA", TLS_DH_RSA_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_CAMELLIA_128_CBC_SHA", TLS_DHE_DSS_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA", TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DH_anon_WITH_CAMELLIA_128_CBC_SHA", TLS_DH_anon_WITH_CAMELLIA_128_CBC_SHA},
+
+	{"TLS_DHE_DSS_WITH_RC4_128_SHA", TLS_DHE_DSS_WITH_RC4_128_SHA},
+	{"TLS_DHE_RSA_WITH_AES_128_CBC_SHA256", TLS_DHE_RSA_WITH_AES_128_CBC_SHA256},
+	{"TLS_DHE_DSS_WITH_AES_256_CBC_SHA256", TLS_DHE_DSS_WITH_AES_256_CBC_SHA256},
+	{"TLS_DHE_RSA_WITH_AES_256_CBC_SHA256", TLS_DHE_RSA_WITH_AES_256_CBC_SHA256},
+
+	{"TLS_RSA_WITH_CAMELLIA_256_CBC_SHA", TLS_RSA_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DH_DSS_WITH_CAMELLIA_256_CBC_SHA", TLS_DH_DSS_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DH_RSA_WITH_CAMELLIA_256_CBC_SHA", TLS_DH_RSA_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_CAMELLIA_256_CBC_SHA", TLS_DHE_DSS_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA", TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DH_anon_WITH_CAMELLIA_256_CBC_SHA", TLS_DH_anon_WITH_CAMELLIA_256_CBC_SHA},
+
+	{"TLS_RSA_WITH_SEED_CBC_SHA", TLS_RSA_WITH_SEED_CBC_SHA},
+
+	{"TLS_RSA_WITH_AES_128_GCM_SHA256", TLS_RSA_WITH_AES_128_GCM_SHA256},
+	{"TLS_RSA_WITH_AES_256_GCM_SHA384", TLS_RSA_WITH_AES_256_GCM_SHA384},
+	{"TLS_DHE_RSA_WITH_AES_128_GCM_SHA256", TLS_DHE_RSA_WITH_AES_128_GCM_SHA256},
+	{"TLS_DHE_RSA_WITH_AES_256_GCM_SHA384", TLS_DHE_RSA_WITH_AES_256_GCM_SHA384},
+	{"TLS_DHE_DSS_WITH_AES_128_GCM_SHA256", TLS_DHE_DSS_WITH_AES_128_GCM_SHA256},
+	{"TLS_DHE_DSS_WITH_AES_256_GCM_SHA384", TLS_DHE_DSS_WITH_AES_256_GCM_SHA384},
+
+	{"TLS_AES_128_GCM_SHA256", TLS_AES_128_GCM_SHA256},
+	{"TLS_AES_256_GCM_SHA384", TLS_AES_256_GCM_SHA384},
+	{"TLS_CHACHA20_POLY1305_SHA256", TLS_CHACHA20_POLY1305_SHA256},
+	{NULL, 0}
+};
+
+/*
+ * pg_find_cipher
+ *			Translate an NSS ciphername to the cipher code
+ *
+ * Searches the configured ciphers for the corresponding cipher code to the
+ * name. Search is performed case insensitive.
+ */
+PRUint16
+pg_find_cipher(char *name)
+{
+	const		NSSCiphers *cipher_list = NSS_CipherList;
+
+	while (cipher_list->name)
+	{
+		if (pg_strcasecmp(cipher_list->name, name) == 0)
+			return cipher_list->number;
+
+		cipher_list++;
+	}
+
+	return 0xFFFF;
+}
+
+#endif							/* USE_NSS */
+
+#endif							/* PG_NSS_H */
diff --git a/src/include/libpq/libpq-be.h b/src/include/libpq/libpq-be.h
index 0a23281ad5..b68ef64ec9 100644
--- a/src/include/libpq/libpq-be.h
+++ b/src/include/libpq/libpq-be.h
@@ -192,13 +192,18 @@ typedef struct Port
 	bool		peer_cert_valid;
 
 	/*
-	 * OpenSSL structures. (Keep these last so that the locations of other
-	 * fields are the same whether or not you build with OpenSSL.)
+	 * SSL backend specific structures. (Keep these last so that the locations
+	 * of other fields are the same whether or not you build with SSL
+	 * enabled.)
 	 */
 #ifdef USE_OPENSSL
 	SSL		   *ssl;
 	X509	   *peer;
 #endif
+
+#ifdef USE_NSS
+	void	   *pr_fd;
+#endif
 } Port;
 
 #ifdef USE_SSL
@@ -292,6 +297,10 @@ extern char *be_tls_get_certificate_hash(Port *port, size_t *len);
 typedef void (*openssl_tls_init_hook_typ) (SSL_CTX *context, bool isServerStart);
 extern PGDLLIMPORT openssl_tls_init_hook_typ openssl_tls_init_hook;
 #endif
+#ifdef USE_NSS
+typedef void (*nss_tls_init_hook_type) (bool isServerStart);
+extern PGDLLIMPORT nss_tls_init_hook_type nss_tls_init_hook;
+#endif
 
 #endif							/* USE_SSL */
 
diff --git a/src/include/libpq/libpq.h b/src/include/libpq/libpq.h
index b1152475ac..298d87ecae 100644
--- a/src/include/libpq/libpq.h
+++ b/src/include/libpq/libpq.h
@@ -88,6 +88,9 @@ extern PGDLLIMPORT bool ssl_passphrase_command_supports_reload;
 #ifdef USE_SSL
 extern bool ssl_loaded_verify_locations;
 #endif
+#ifdef USE_NSS
+extern char *ssl_database;
+#endif
 
 extern int	secure_initialize(bool isServerStart);
 extern bool secure_loaded_verify_locations(void);
diff --git a/src/include/pg_config.h.in b/src/include/pg_config.h.in
index fb270df678..31f808398c 100644
--- a/src/include/pg_config.h.in
+++ b/src/include/pg_config.h.in
@@ -893,6 +893,9 @@
 /* Define to 1 to build with PAM support. (--with-pam) */
 #undef USE_PAM
 
+/* Define to build with NSS support (--with-nss) */
+#undef USE_NSS
+
 /* Define to 1 to use software CRC-32C implementation (slicing-by-8). */
 #undef USE_SLICING_BY_8_CRC32C
 
diff --git a/src/include/pg_config_manual.h b/src/include/pg_config_manual.h
index 705dc69c06..c28b84126d 100644
--- a/src/include/pg_config_manual.h
+++ b/src/include/pg_config_manual.h
@@ -176,10 +176,9 @@
 
 /*
  * USE_SSL code should be compiled only when compiling with an SSL
- * implementation.  (Currently, only OpenSSL is supported, but we might add
- * more implementations in the future.)
+ * implementation.
  */
-#ifdef USE_OPENSSL
+#if defined(USE_OPENSSL) || defined(USE_NSS)
 #define USE_SSL
 #endif
 
diff --git a/src/interfaces/libpq/Makefile b/src/interfaces/libpq/Makefile
index 4ac5f4b340..e902f38c8e 100644
--- a/src/interfaces/libpq/Makefile
+++ b/src/interfaces/libpq/Makefile
@@ -45,12 +45,21 @@ OBJS = \
 	pqexpbuffer.o \
 	fe-auth.o
 
-ifeq ($(with_openssl),yes)
+ifneq ($(with_ssl),no)
+OBJS += \
+	fe-secure-common.o
+endif
+
+ifeq ($(with_ssl),openssl)
 OBJS += \
-	fe-secure-common.o \
 	fe-secure-openssl.o
 endif
 
+ifeq ($(with_ssl), nss)
+OBJS += \
+	fe-secure-nss.o
+endif
+
 ifeq ($(with_gssapi),yes)
 OBJS += \
 	fe-gssapi-common.o \
diff --git a/src/interfaces/libpq/fe-connect.c b/src/interfaces/libpq/fe-connect.c
index b0ca37c2ed..a15a89c50c 100644
--- a/src/interfaces/libpq/fe-connect.c
+++ b/src/interfaces/libpq/fe-connect.c
@@ -355,6 +355,10 @@ static const internalPQconninfoOption PQconninfoOptions[] = {
 		"Target-Session-Attrs", "", 11, /* sizeof("read-write") = 11 */
 	offsetof(struct pg_conn, target_session_attrs)},
 
+	{"cert_database", NULL, NULL, NULL,
+		"CertificateDatabase", "", 64,
+	offsetof(struct pg_conn, cert_database)},
+
 	/* Terminating entry --- MUST BE LAST */
 	{NULL, NULL, NULL, NULL,
 	NULL, NULL, 0}
diff --git a/src/interfaces/libpq/fe-secure-nss.c b/src/interfaces/libpq/fe-secure-nss.c
new file mode 100644
index 0000000000..395147f551
--- /dev/null
+++ b/src/interfaces/libpq/fe-secure-nss.c
@@ -0,0 +1,1018 @@
+/*-------------------------------------------------------------------------
+ *
+ * fe-secure-nss.c
+ *	  functions for supporting NSS as a TLS backend for frontend libpq
+ *
+ * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ *	  src/interfaces/libpq/fe-secure-nss.c
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#include "postgres_fe.h"
+
+#include "libpq-fe.h"
+#include "fe-auth.h"
+#include "fe-secure-common.h"
+#include "libpq-int.h"
+
+/*
+ * BITS_PER_BYTE is also defined in the NSPR header files, so we need to undef
+ * our version to avoid compiler warnings on redefinition.
+ */
+#define pg_BITS_PER_BYTE BITS_PER_BYTE
+#undef BITS_PER_BYTE
+
+/*
+ * The nspr/obsolete/protypes.h NSPR header typedefs uint64 and int64 with
+ * colliding definitions from ours, causing a much expected compiler error.
+ * Remove backwards compatibility with ancient NSPR versions to avoid this.
+ */
+#define NO_NSPR_10_SUPPORT
+#include <nspr/nspr.h>
+#include <nspr/prerror.h>
+#include <nspr/prinit.h>
+#include <nspr/prio.h>
+#include <nss/nss.h>
+#include <nss/ssl.h>
+#include <nss/sslproto.h>
+#include <nss/pk11func.h>
+#include <nss/secerr.h>
+#include <nss/secmod.h>
+
+/*
+ * Ensure that the colliding definitions match, else throw an error. In case
+ * NSPR remove the definition in a future version (however unlikely that may
+ * be, make sure to put ours back again.
+ */
+#if defined(BITS_PER_BYTE)
+#if BITS_PER_BYTE != pg_BITS_PER_BYTE
+#error "incompatible byte widths between NSPR and PostgreSQL"
+#endif
+#else
+#define BITS_PER_BYTE pg_BITS_PER_BYTE
+#endif
+#undef pg_BITS_PER_BYTE
+
+static SECStatus pg_load_nss_module(SECMODModule * *module, const char *library, const char *name);
+static SECStatus pg_bad_cert_handler(void *arg, PRFileDesc * fd);
+static const char *pg_SSLerrmessage(PRErrorCode errcode);
+static SECStatus pg_client_auth_handler(void *arg, PRFileDesc * socket, CERTDistNames * caNames,
+										CERTCertificate * *pRetCert, SECKEYPrivateKey * *pRetKey);
+static SECStatus pg_cert_auth_handler(void *arg, PRFileDesc * fd, PRBool checksig, PRBool isServer);
+static int	ssl_protocol_version_to_nss(const char *protocol);
+static bool cert_database_has_CA(PGconn *conn);
+
+static char *PQssl_passwd_cb(PK11SlotInfo * slot, PRBool retry, void *arg);
+
+/*
+ * PR_ImportTCPSocket() is a private API, but very widely used, as it's the
+ * only way to make NSS use an already set up POSIX file descriptor rather
+ * than opening one itself. To quote the NSS documentation:
+ *
+ *		"In theory, code that uses PR_ImportTCPSocket may break when NSPR's
+ *		implementation changes. In practice, this is unlikely to happen because
+ *		NSPR's implementation has been stable for years and because of NSPR's
+ *		strong commitment to backward compatibility."
+ *
+ * https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSPR/Reference/PR_ImportTCPSocket
+ *
+ * The function is declared in <private/pprio.h>, but as it is a header marked
+ * private we declare it here rather than including it.
+ */
+NSPR_API(PRFileDesc *) PR_ImportTCPSocket(int);
+
+static SECMODModule * ca_trust = NULL;
+static NSSInitContext * nss_context = NULL;
+
+/*
+ * Track whether the NSS database has a password set or not. There is no API
+ * function for retrieving password status, so we simply flip this to true in
+ * case NSS invoked the password callback - as that will only happen in case
+ * there is a password. The reason for tracking this is that there are calls
+ * which require a password parameter, but doesn't use the callbacks provided,
+ * so we must call the callback on behalf of these.
+ */
+static bool has_password = false;
+
+/*
+ * This logic exist in NSS as well, but it's only available for when there is
+ * a database to open, and not only using the system trust store. Thus, we
+ * need to keep our own copy.
+ */
+#if defined(WIN32)
+static const char *ca_trust_name = "nssckbi.dll";
+#elif defined(__darwin__)
+static const char *ca_trust_name = "libnssckbi.dylib";
+#else
+static const char *ca_trust_name = "libnssckbi.so";
+#endif
+
+static PQsslKeyPassHook_nss_type PQsslKeyPassHook = NULL;
+
+/* ------------------------------------------------------------ */
+/*			 Procedures common to all secure sessions			*/
+/* ------------------------------------------------------------ */
+
+/*
+ * pgtls_init_library
+ *
+ * There is no direct equivalent for PQinitOpenSSL in NSS/NSPR, with PR_Init
+ * being the closest match there is. PR_Init is however already documented to
+ * not be required so simply making this a noop seems like the best option.
+ */
+void
+pgtls_init_library(bool do_ssl, int do_crypto)
+{
+	/* noop */
+}
+
+int
+pgtls_init(PGconn *conn)
+{
+	conn->ssl_in_use = false;
+
+	return 0;
+}
+
+void
+pgtls_close(PGconn *conn)
+{
+	if (nss_context)
+	{
+		NSS_ShutdownContext(nss_context);
+		nss_context = NULL;
+	}
+}
+
+PostgresPollingStatusType
+pgtls_open_client(PGconn *conn)
+{
+	SECStatus	status;
+	PRFileDesc *pr_fd;
+	PRFileDesc *model;
+	NSSInitParameters params;
+	SSLVersionRange desired_range;
+
+	/*
+	 * The NSPR documentation states that runtime initialization via PR_Init
+	 * is no longer required, as the first caller into NSPR will perform the
+	 * initialization implicitly. See be-secure-nss.c for further discussion
+	 * on PR_Init.
+	 */
+	PR_Init(PR_USER_THREAD, PR_PRIORITY_NORMAL, 0);
+
+	/*
+	 * NSS initialization and the use of contexts is further discussed in
+	 * be-secure-nss.c
+	 */
+	memset(&params, 0, sizeof(params));
+	params.length = sizeof(params);
+
+	if (conn->cert_database && strlen(conn->cert_database) > 0)
+	{
+		char	   *cert_database_path = psprintf("sql:%s", conn->cert_database);
+
+		nss_context = NSS_InitContext(cert_database_path, "", "", "",
+									  &params,
+									  NSS_INIT_READONLY | NSS_INIT_PK11RELOAD);
+		pfree(cert_database_path);
+	}
+	else
+		nss_context = NSS_InitContext("", "", "", "", &params,
+									  NSS_INIT_READONLY | NSS_INIT_NOCERTDB |
+									  NSS_INIT_NOMODDB | NSS_INIT_FORCEOPEN |
+									  NSS_INIT_NOROOTINIT | NSS_INIT_PK11RELOAD);
+
+	if (!nss_context)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to %s certificate database: %s"),
+						  conn->cert_database ? "open" : "create",
+						  pg_SSLerrmessage(PR_GetError()));
+
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * Configure cipher policy.
+	 */
+	status = NSS_SetDomesticPolicy();
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to configure cipher policy: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * If we don't have a certificate database, the system trust store is the
+	 * fallback we can use. If we fail to initialize that as well, we can
+	 * still attempt a connection as long as the sslmode isn't verify*.
+	 */
+	if (!conn->cert_database && conn->sslmode[0] == 'v')
+	{
+		status = pg_load_nss_module(&ca_trust, ca_trust_name, "\"Root Certificates\"");
+		if (status != SECSuccess)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("WARNING: unable to load NSS trust module \"%s\" : %s"),
+							  ca_trust_name,
+							  pg_SSLerrmessage(PR_GetError()));
+
+			return PGRES_POLLING_FAILED;
+		}
+	}
+
+
+	PK11_SetPasswordFunc(PQssl_passwd_cb);
+
+	/*
+	 * Import the already opened socket as we don't want to use NSPR functions
+	 * for opening the network socket due to how the PostgreSQL protocol works
+	 * with TLS connections. This function is not part of the NSPR public API,
+	 * see the comment at the top of the file for the rationale of still using
+	 * it.
+	 */
+	pr_fd = PR_ImportTCPSocket(conn->sock);
+	if (!pr_fd)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to attach to socket: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * Most of the documentation available, and implementations of, NSS/NSPR
+	 * use the PR_NewTCPSocket() function here, which has the drawback that it
+	 * can only create IPv4 sockets. Instead use PR_OpenTCPSocket() which
+	 * copes with IPv6 as well.
+	 */
+	model = SSL_ImportFD(NULL, PR_OpenTCPSocket(conn->laddr.addr.ss_family));
+	if (!model)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to enable TLS: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/* Disable old protocol versions (SSLv2 and SSLv3) */
+	SSL_OptionSet(model, SSL_ENABLE_SSL2, PR_FALSE);
+	SSL_OptionSet(model, SSL_V2_COMPATIBLE_HELLO, PR_FALSE);
+	SSL_OptionSet(model, SSL_ENABLE_SSL3, PR_FALSE);
+
+#ifdef SSL_CBC_RANDOM_IV
+
+	/*
+	 * Enable protection against the BEAST attack in case the NSS library has
+	 * support for that. While SSLv3 is disabled, we may still allow TLSv1
+	 * which is affected. The option isn't documented as an SSL option, but as
+	 * an NSS environment variable.
+	 */
+	SSL_OptionSet(model, SSL_CBC_RANDOM_IV, PR_TRUE);
+#endif
+
+	/* Set us up as a TLS client for the handshake */
+	SSL_OptionSet(model, SSL_HANDSHAKE_AS_CLIENT, PR_TRUE);
+
+	/*
+	 * When setting the available protocols, we either use the user defined
+	 * configuration values, and if missing we accept whatever is the highest
+	 * version supported by the library as the max and only limit the range in
+	 * the other end at TLSv1.0. ssl_variant_stream is a ProtocolVariant enum
+	 * for Stream protocols, rather than datagram.
+	 */
+	SSL_VersionRangeGetSupported(ssl_variant_stream, &desired_range);
+	desired_range.min = SSL_LIBRARY_VERSION_TLS_1_0;
+
+	if (conn->ssl_min_protocol_version && strlen(conn->ssl_min_protocol_version) > 0)
+	{
+		int			ssl_min_ver = ssl_protocol_version_to_nss(conn->ssl_min_protocol_version);
+
+		if (ssl_min_ver == -1)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("invalid value \"%s\" for minimum version of SSL protocol\n"),
+							  conn->ssl_min_protocol_version);
+			return -1;
+		}
+
+		desired_range.min = ssl_min_ver;
+	}
+
+	if (conn->ssl_max_protocol_version && strlen(conn->ssl_max_protocol_version) > 0)
+	{
+		int			ssl_max_ver = ssl_protocol_version_to_nss(conn->ssl_max_protocol_version);
+
+		if (ssl_max_ver == -1)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("invalid value \"%s\" for maximum version of SSL protocol\n"),
+							  conn->ssl_max_protocol_version);
+			return -1;
+		}
+
+		desired_range.max = ssl_max_ver;
+	}
+
+	if (SSL_VersionRangeSet(model, &desired_range) != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to set allowed SSL protocol version range: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * Set up callback for verifying server certificates, as well as for how
+	 * to handle failed verifications.
+	 */
+	SSL_AuthCertificateHook(model, pg_cert_auth_handler, (void *) conn);
+	SSL_BadCertHook(model, pg_bad_cert_handler, (void *) conn);
+
+	/*
+	 * Convert the NSPR socket to an SSL socket. Ensuring the success of this
+	 * operation is critical as NSS SSL_* functions may return SECSuccess on
+	 * the socket even though SSL hasn't been enabled, which introduce a risk
+	 * of silent downgrades.
+	 */
+	conn->pr_fd = SSL_ImportFD(model, pr_fd);
+	if (!conn->pr_fd)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to configure client for TLS: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * The model can now we closed as we've applied the settings of the model
+	 * onto the real socket. From hereon we should only use conn->pr_fd.
+	 */
+	PR_Close(model);
+
+	/* Set the private data to be passed to the password callback */
+	SSL_SetPKCS11PinArg(conn->pr_fd, (void *) conn);
+
+	/*
+	 * If a CRL file has been specified, verify if it exists in the database
+	 * but don't fail in case it doesn't.
+	 */
+	if (conn->sslcrl && strlen(conn->sslcrl) > 0)
+	{
+		/* XXX: Implement me.. */
+	}
+
+	status = SSL_ResetHandshake(conn->pr_fd, PR_FALSE);
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to initiate handshake: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * Set callback for client authentication when requested by the server.
+	 */
+	SSL_GetClientAuthDataHook(conn->pr_fd, pg_client_auth_handler, (void *) conn);
+
+	/*
+	 * Specify which hostname we are expecting to talk to. This is required,
+	 * albeit mostly applies to when opening a connection to a traditional
+	 * http server it seems.
+	 */
+	SSL_SetURL(conn->pr_fd, (conn->connhost[conn->whichhost]).host);
+
+	do
+	{
+		status = SSL_ForceHandshake(conn->pr_fd);
+	}
+	while (status != SECSuccess && PR_GetError() == PR_WOULD_BLOCK_ERROR);
+
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("SSL error: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	conn->ssl_in_use = true;
+	return PGRES_POLLING_OK;
+}
+
+ssize_t
+pgtls_read(PGconn *conn, void *ptr, size_t len)
+{
+	PRInt32		nread;
+	PRErrorCode status;
+	int			read_errno = 0;
+
+	/*
+	 * PR_Recv blocks until there is data to read or the timeout expires. We
+	 * don't want to sit blocked here, so the timeout is turned off by using
+	 * PR_INTERVAL_NO_WAIT which means "return immediately",  Zero is returned
+	 * for closed connections, while -1 indicates an error within the ongoing
+	 * connection.
+	 */
+	nread = PR_Recv(conn->pr_fd, ptr, len, 0, PR_INTERVAL_NO_WAIT);
+
+	if (nread == 0)
+	{
+		read_errno = ECONNRESET;
+		return -1;
+	}
+
+	if (nread == -1)
+	{
+		status = PR_GetError();
+
+		switch (status)
+		{
+			case PR_WOULD_BLOCK_ERROR:
+				read_errno = EWOULDBLOCK;
+				break;
+
+				/*
+				 * The error cases for PR_Recv are not documented, but can be
+				 * reverse engineered from _MD_unix_map_default_error() in the
+				 * NSPR code, defined in pr/src/md/unix/unix_errors.c.
+				 */
+			default:
+				read_errno = ECONNRESET;
+				break;
+		}
+
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("TLS read error: %s"),
+						  pg_SSLerrmessage(status));
+	}
+
+	SOCK_ERRNO_SET(read_errno);
+	return (ssize_t) nread;
+}
+
+/*
+ * pgtls_read_pending
+ *		Check for the existence of data to be read.
+ *
+ * This is part of the PostgreSQL TLS backend API.
+ */
+bool
+pgtls_read_pending(PGconn *conn)
+{
+	unsigned char c;
+	int			n;
+
+	/*
+	 * PR_Recv peeks into the stream with the timeount turned off, to see if
+	 * there is another byte to read off the wire. There is an NSS function
+	 * SSL_DataPending() which might seem like a better fit, but it will only
+	 * check already encrypted data in the SSL buffer, not still unencrypted
+	 * data, thus it doesn't guarantee that a subsequent call to
+	 * PR_Read/PR_Recv wont block.
+	 */
+	n = PR_Recv(conn->pr_fd, &c, 1, PR_MSG_PEEK, PR_INTERVAL_NO_WAIT);
+	return (n > 0);
+}
+
+ssize_t
+pgtls_write(PGconn *conn, const void *ptr, size_t len)
+{
+	PRInt32		n;
+	PRErrorCode status;
+	int			write_errno = 0;
+
+	n = PR_Write(conn->pr_fd, ptr, len);
+
+	if (n < 0)
+	{
+		status = PR_GetError();
+
+		switch (status)
+		{
+			case PR_WOULD_BLOCK_ERROR:
+#ifdef EAGAIN
+				write_errno = EAGAIN;
+#else
+				write_errno = EINTR;
+#endif
+				break;
+
+			default:
+				printfPQExpBuffer(&conn->errorMessage,
+								  libpq_gettext("TLS write error: %s"),
+								  pg_SSLerrmessage(status));
+				write_errno = ECONNRESET;
+				break;
+		}
+	}
+
+	SOCK_ERRNO_SET(write_errno);
+	return (ssize_t) n;
+}
+
+/*
+ *	Verify that the server certificate matches the hostname we connected to.
+ *
+ * The certificate's Common Name and Subject Alternative Names are considered.
+ */
+int
+pgtls_verify_peer_name_matches_certificate_guts(PGconn *conn,
+												int *names_examined,
+												char **first_name)
+{
+	char		   *server_hostname = NULL;
+	CERTCertificate *server_cert = NULL;
+	SECStatus status = SECSuccess;
+	SECItem			altname_item;
+	PLArenaPool	   *arena = NULL;
+	CERTGeneralName *san_list;
+	CERTGeneralName *cn;
+
+	server_hostname = SSL_RevealURL(conn->pr_fd);
+	if (!server_hostname || server_hostname[0] == '\0')
+		goto done;
+
+	/*
+	 * CERT_VerifyCertName will internally perform RFC 2818 SubjectAltName
+	 * verification.
+	 */
+	server_cert = SSL_PeerCertificate(conn->pr_fd);
+	status = CERT_VerifyCertName(server_cert, server_hostname);
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to verify server hostname: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		goto done;
+	}
+
+	status = CERT_FindCertExtension(server_cert, SEC_OID_X509_SUBJECT_ALT_NAME,
+									&altname_item);
+	if (status == SECSuccess)
+	{
+		arena = PORT_NewArena(DER_DEFAULT_CHUNKSIZE);
+		if (!arena)
+		{
+			status = SECFailure;
+			goto done;
+		}
+		san_list = CERT_DecodeAltNameExtension(arena, &altname_item);
+		if (!san_list)
+		{
+			status = SECFailure;
+			goto done;
+		}
+
+		for (cn = san_list; cn != san_list; cn = CERT_GetNextGeneralName(cn))
+		{
+			char	   *alt_name;
+			int			rv;
+			char		tmp[512];
+
+			status = CERT_RFC1485_EscapeAndQuote(tmp, sizeof(tmp),
+												 (char *) cn->name.other.data,
+												 cn->name.other.len);
+
+			if (status != SECSuccess)
+				goto done;
+
+			rv = pq_verify_peer_name_matches_certificate_name(conn, tmp,
+															  strlen(tmp),
+															  &alt_name);
+			if (alt_name)
+			{
+				if (!*first_name)
+					*first_name = alt_name;
+				else
+					free(alt_name);
+			}
+
+			if (rv == 1)
+				status = SECSuccess;
+			else
+			{
+				status = SECFailure;
+				break;
+			}
+		}
+	}
+	else if (PORT_GetError() == SEC_ERROR_EXTENSION_NOT_FOUND)
+		status = SECSuccess;
+	else
+		status = SECSuccess;
+
+done:
+	/* san_list will be freed by freeing the arena it was allocated in */
+	if (arena)
+		PORT_FreeArena(arena, PR_TRUE);
+	PR_Free(server_hostname);
+
+	if (status == SECSuccess)
+		return 1;
+
+	return 0;
+}
+
+/* ------------------------------------------------------------ */
+/*			PostgreSQL specific TLS support functions			*/
+/* ------------------------------------------------------------ */
+
+static const char *
+pg_SSLerrmessage(PRErrorCode errcode)
+{
+	const char *error;
+
+	error = PR_ErrorToName(errcode);
+	if (error)
+		return error;
+
+	return "unknown TLS error";
+}
+
+static SECStatus
+pg_load_nss_module(SECMODModule * *module, const char *library, const char *name)
+{
+	SECMODModule *mod;
+	char	   *modulespec;
+
+	modulespec = psprintf("library=\"%s\", name=\"%s\"", library, name);
+
+	/*
+	 * Attempt to load the specified module. The second parameter is "parent"
+	 * which should always be NULL for application code. The third parameter
+	 * defines if loading should recurse which is only applicable when loading
+	 * a module from within another module. This hierarchy would have to be
+	 * defined in the modulespec, and since we don't support anything but
+	 * directly addressed modules we should pass PR_FALSE.
+	 */
+	mod = SECMOD_LoadUserModule(modulespec, NULL, PR_FALSE);
+	pfree(modulespec);
+
+	if (mod && mod->loaded)
+	{
+		*module = mod;
+		return SECSuccess;
+	}
+
+	SECMOD_DestroyModule(mod);
+	return SECFailure;
+}
+
+/* ------------------------------------------------------------ */
+/*						NSS Callbacks							*/
+/* ------------------------------------------------------------ */
+
+/*
+ * pg_cert_auth_handler
+ *			Callback for authenticating server certificate
+ *
+ * This is pretty much the same procedure as the SSL_AuthCertificate function
+ * provided by NSS, with the difference being server hostname validation. With
+ * SSL_AuthCertificate there is no way to do verify-ca, it only does the -full
+ * flavor of our sslmodes, so we need our own implementation.
+ */
+static SECStatus
+pg_cert_auth_handler(void *arg, PRFileDesc *fd, PRBool checksig, PRBool isServer)
+{
+	SECStatus	status;
+	PGconn	   *conn = (PGconn *) arg;
+	CERTCertificate *server_cert;
+	void	   *pin;
+
+	Assert(!isServer);
+
+	pin = SSL_RevealPinArg(conn->pr_fd);
+	server_cert = SSL_PeerCertificate(conn->pr_fd);
+
+	status = CERT_VerifyCertificateNow((CERTCertDBHandle *) CERT_GetDefaultCertDB(),
+									   server_cert,
+									   checksig,
+									   certificateUsageSSLServer,
+									   pin,
+									   NULL);
+
+	/*
+	 * If we've already failed validation then there is no point in also
+	 * performing the hostname check for verify-full.
+	 */
+	if (status == SECSuccess)
+	{
+		if (!pq_verify_peer_name_matches_certificate(conn))
+			status = SECFailure;
+	}
+	else
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to verify certificate: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+	}
+
+	return status;
+}
+
+/*
+ * pg_client_auth_handler
+ *		Callback for client certificate validation
+ *
+ * The client auth callback is not on by default in NSS, so we need to invoke
+ * it ourselves to ensure we can do cert authentication. A TODO is to support
+ * running without a specified sslcert parameter. By retrieving all the certs
+ * via nickname from the cert database and see if we find one which apply with
+ * NSS_CmpCertChainWCANames() and PK11_FindKeyByAnyCert() we could support
+ * just running with a ssl database specified.
+ *
+ * For now, we use the default client certificate validation which requires a
+ * defined nickname to identify the cert in the database.
+ */
+static SECStatus
+pg_client_auth_handler(void *arg, PRFileDesc * socket, CERTDistNames * caNames,
+					   CERTCertificate * *pRetCert, SECKEYPrivateKey * *pRetKey)
+{
+	PGconn	   *conn = (PGconn *) arg;
+
+	return NSS_GetClientAuthData(conn->sslcert, socket, caNames, pRetCert, pRetKey);
+}
+
+/*
+ * pg_bad_cert_handler
+ *		Callback for failed certificate validation
+ *
+ * The TLS handshake will call this function iff the server certificate failed
+ * validation. Depending on the sslmode, we allow the connection anyways.
+ */
+static SECStatus
+pg_bad_cert_handler(void *arg, PRFileDesc * fd)
+{
+	PGconn	   *conn = (PGconn *) arg;
+	PRErrorCode err;
+
+	/*
+	 * This really shouldn't happen, as we've the the PGconn object as our
+	 * callback data, and at the callsite we know it will be populated. That
+	 * being said, the NSS code itself performs this check even when it should
+	 * not be required so let's use the same belts with our suspenders.
+	 */
+	if (!arg)
+		return SECFailure;
+
+	/*
+	 * For sslmodes other than verify-full and verify-ca we don't perform peer
+	 * validation, so return immediately.  sslmode require with a database
+	 * specified which contains a CA certificate will work like verify-ca to
+	 * be compatible with the OpenSSL implementation.
+	 */
+	if (strcmp(conn->sslmode, "require") == 0)
+	{
+		if (conn->cert_database && strlen(conn->cert_database) > 0 && cert_database_has_CA(conn))
+			return SECFailure;
+	}
+	if (conn->sslmode[0] == 'v')
+		return SECFailure;
+
+	err = PORT_GetError();
+
+	/*
+	 * TODO: these are relevant error codes that can occur in certificate
+	 * validation, figure out which we dont want for require/prefer etc.
+	 */
+	switch (err)
+	{
+		case SEC_ERROR_INVALID_AVA:
+		case SEC_ERROR_INVALID_TIME:
+		case SEC_ERROR_BAD_SIGNATURE:
+		case SEC_ERROR_EXPIRED_CERTIFICATE:
+		case SEC_ERROR_UNKNOWN_ISSUER:
+		case SEC_ERROR_UNTRUSTED_ISSUER:
+		case SEC_ERROR_UNTRUSTED_CERT:
+		case SEC_ERROR_CERT_VALID:
+		case SEC_ERROR_EXPIRED_ISSUER_CERTIFICATE:
+		case SEC_ERROR_CRL_EXPIRED:
+		case SEC_ERROR_CRL_BAD_SIGNATURE:
+		case SEC_ERROR_EXTENSION_VALUE_INVALID:
+		case SEC_ERROR_CA_CERT_INVALID:
+		case SEC_ERROR_CERT_USAGES_INVALID:
+		case SEC_ERROR_UNKNOWN_CRITICAL_EXTENSION:
+			return SECSuccess;
+			break;
+		default:
+			return SECFailure;
+			break;
+	}
+
+	/* Unreachable */
+	return SECSuccess;
+}
+
+/* ------------------------------------------------------------ */
+/*					SSL information functions					*/
+/* ------------------------------------------------------------ */
+
+/*
+ * PQgetssl
+ *
+ * Return NULL as this is legacy and defined to always be equal to calling
+ * PQsslStruct(conn, "OpenSSL"); This should ideally trigger a logged warning
+ * somewhere as it's nonsensical to run in a non-OpenSSL build, but the color
+ * of said bikeshed hasn't yet been determined.
+ */
+void *
+PQgetssl(PGconn *conn)
+{
+	return NULL;
+}
+
+void *
+PQsslStruct(PGconn *conn, const char *struct_name)
+{
+	if (!conn)
+		return NULL;
+
+	/*
+	 * Return the underlying PRFileDesc which can be used to access
+	 * information on the connection details. There is no SSL context per se.
+	 */
+	if (strcmp(struct_name, "NSS") == 0)
+		return conn->pr_fd;
+	return NULL;
+}
+
+const char *const *
+PQsslAttributeNames(PGconn *conn)
+{
+	static const char *const result[] = {
+		"library",
+		"cipher",
+		"protocol",
+		"key_bits",
+		"compression",
+		NULL
+	};
+
+	return result;
+}
+
+const char *
+PQsslAttribute(PGconn *conn, const char *attribute_name)
+{
+	SECStatus	status;
+	SSLChannelInfo channel;
+	SSLCipherSuiteInfo suite;
+
+	if (!conn || !conn->pr_fd)
+		return NULL;
+
+	if (strcmp(attribute_name, "library") == 0)
+		return "NSS";
+
+	status = SSL_GetChannelInfo(conn->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+		return NULL;
+
+	status = SSL_GetCipherSuiteInfo(channel.cipherSuite, &suite, sizeof(suite));
+	if (status != SECSuccess)
+		return NULL;
+
+	if (strcmp(attribute_name, "cipher") == 0)
+		return suite.cipherSuiteName;
+
+	if (strcmp(attribute_name, "key_bits") == 0)
+	{
+		static char key_bits_str[8];
+
+		snprintf(key_bits_str, sizeof(key_bits_str), "%i", suite.effectiveKeyBits);
+		return key_bits_str;
+	}
+
+	if (strcmp(attribute_name, "protocol") == 0)
+	{
+		switch (channel.protocolVersion)
+		{
+#ifdef SSL_LIBRARY_VERSION_TLS_1_3
+			case SSL_LIBRARY_VERSION_TLS_1_3:
+				return "TLSv1.3";
+#endif
+#ifdef SSL_LIBRARY_VERSION_TLS_1_2
+			case SSL_LIBRARY_VERSION_TLS_1_2:
+				return "TLSv1.2";
+#endif
+#ifdef SSL_LIBRARY_VERSION_TLS_1_1
+			case SSL_LIBRARY_VERSION_TLS_1_1:
+				return "TLSv1.1";
+#endif
+			case SSL_LIBRARY_VERSION_TLS_1_0:
+				return "TLSv1.0";
+			default:
+				return "unknown";
+		}
+	}
+
+	/*
+	 * NSS disabled support for compression in version 3.33, and it was only
+	 * available for SSLv3 at that point anyways, so we can safely return off
+	 * here without checking.
+	 */
+	if (strcmp(attribute_name, "compression") == 0)
+		return "off";
+
+	return NULL;
+}
+
+static int
+ssl_protocol_version_to_nss(const char *protocol)
+{
+	if (pg_strcasecmp("TLSv1", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_0;
+
+#ifdef SSL_LIBRARY_VERSION_TLS_1_1
+	if (pg_strcasecmp("TLSv1.1", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_1;
+#endif
+
+#ifdef SSL_LIBRARY_VERSION_TLS_1_2
+	if (pg_strcasecmp("TLSv1.2", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_2;
+#endif
+
+#ifdef SSL_LIBRARY_VERSION_TLS_1_3
+	if (pg_strcasecmp("TLSv1.3", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_3;
+#endif
+
+	return -1;
+}
+
+static bool
+cert_database_has_CA(PGconn *conn)
+{
+	CERTCertList *certificates;
+	bool		hasCA;
+
+	/*
+	 * If the certificate database has a password we must provide it, since
+	 * this API doesn't invoke the standard password callback.
+	 */
+	if (has_password)
+		certificates = PK11_ListCerts(PK11CertListCA, PQssl_passwd_cb(NULL, PR_FALSE, (void *) conn));
+	else
+		certificates = PK11_ListCerts(PK11CertListCA, NULL);
+	hasCA = !CERT_LIST_EMPTY(certificates);
+	CERT_DestroyCertList(certificates);
+
+	return hasCA;
+}
+
+PQsslKeyPassHook_nss_type
+PQgetSSLKeyPassHook_nss(void)
+{
+	return PQsslKeyPassHook;
+}
+
+void
+PQsetSSLKeyPassHook_nss(PQsslKeyPassHook_nss_type hook)
+{
+	PQsslKeyPassHook = hook;
+}
+
+/*
+ * Supply a password to decrypt a client certificate.
+ *
+ * This must match NSS type PK11PasswordFunc.
+ */
+static char *
+PQssl_passwd_cb(PK11SlotInfo * slot, PRBool retry, void *arg)
+{
+	has_password = true;
+
+	if (PQsslKeyPassHook)
+		return PQsslKeyPassHook(slot, (PRBool) retry, arg);
+	else
+		return PQdefaultSSLKeyPassHook_nss(slot, retry, arg);
+}
+
+/*
+ * The default password handler callback.
+ */
+char *
+PQdefaultSSLKeyPassHook_nss(PK11SlotInfo * slot, PRBool retry, void *arg)
+{
+	PGconn	   *conn = (PGconn *) arg;
+
+	/*
+	 * If the password didn't work the first time there is no point in
+	 * retrying as it hasn't changed.
+	 */
+	if (retry != PR_TRUE && conn->sslpassword && strlen(conn->sslpassword) > 0)
+		return PORT_Strdup(conn->sslpassword);
+
+	return NULL;
+}
diff --git a/src/interfaces/libpq/fe-secure.c b/src/interfaces/libpq/fe-secure.c
index 97c3805303..dd6ee15c5a 100644
--- a/src/interfaces/libpq/fe-secure.c
+++ b/src/interfaces/libpq/fe-secure.c
@@ -427,6 +427,9 @@ PQsslAttributeNames(PGconn *conn)
 
 	return result;
 }
+#endif /* USE_SSL */
+
+#ifndef USE_OPENSSL
 
 PQsslKeyPassHook_OpenSSL_type
 PQgetSSLKeyPassHook_OpenSSL(void)
@@ -445,7 +448,7 @@ PQdefaultSSLKeyPassHook_OpenSSL(char *buf, int size, PGconn *conn)
 {
 	return 0;
 }
-#endif							/* USE_SSL */
+#endif							/* USE_OPENSSL */
 
 /* Dummy version of GSSAPI information functions, when built without GSS support */
 #ifndef ENABLE_GSS
diff --git a/src/interfaces/libpq/libpq-fe.h b/src/interfaces/libpq/libpq-fe.h
index 3b6a9fbce3..27c16e187f 100644
--- a/src/interfaces/libpq/libpq-fe.h
+++ b/src/interfaces/libpq/libpq-fe.h
@@ -625,6 +625,17 @@ extern PQsslKeyPassHook_OpenSSL_type PQgetSSLKeyPassHook_OpenSSL(void);
 extern void PQsetSSLKeyPassHook_OpenSSL(PQsslKeyPassHook_OpenSSL_type hook);
 extern int	PQdefaultSSLKeyPassHook_OpenSSL(char *buf, int size, PGconn *conn);
 
+/* == in fe-secure-nss.c === */
+typedef struct PK11SlotInfoStr PK11SlotInfo;
+typedef int PRIntn;
+typedef PRIntn PRBool;
+
+/* Support for overriding sslpassword handling with a callback. */
+typedef char *(*PQsslKeyPassHook_nss_type) (PK11SlotInfo * slot, PRBool retry, void *arg);
+extern PQsslKeyPassHook_nss_type PQgetSSLKeyPassHook_nss(void);
+extern void PQsetSSLKeyPassHook_nss(PQsslKeyPassHook_nss_type hook);
+extern char *PQdefaultSSLKeyPassHook_nss(PK11SlotInfo * slot, PRBool retry, void *arg);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/src/interfaces/libpq/libpq-int.h b/src/interfaces/libpq/libpq-int.h
index 1de91ae295..49a22f6c7d 100644
--- a/src/interfaces/libpq/libpq-int.h
+++ b/src/interfaces/libpq/libpq-int.h
@@ -362,6 +362,7 @@ struct pg_conn
 	char	   *sslpassword;	/* client key file password */
 	char	   *sslrootcert;	/* root certificate filename */
 	char	   *sslcrl;			/* certificate revocation list filename */
+	char	   *cert_database;	/* NSS certificate/key database */
 	char	   *requirepeer;	/* required peer credentials for local sockets */
 	char	   *gssencmode;		/* GSS mode (require,prefer,disable) */
 	char	   *krbsrvname;		/* Kerberos service name */
@@ -485,6 +486,10 @@ struct pg_conn
 								 * OpenSSL version changes */
 #endif
 #endif							/* USE_OPENSSL */
+
+#ifdef USE_NSS
+	void	   *pr_fd;
+#endif							/* USE_NSS */
 #endif							/* USE_SSL */
 
 #ifdef ENABLE_GSS
diff --git a/src/tools/msvc/Mkvcbuild.pm b/src/tools/msvc/Mkvcbuild.pm
index 90594bd41b..29879b51af 100644
--- a/src/tools/msvc/Mkvcbuild.pm
+++ b/src/tools/msvc/Mkvcbuild.pm
@@ -192,12 +192,19 @@ sub mkvcbuild
 	$postgres->FullExportDLL('postgres.lib');
 
 	# The OBJS scraper doesn't know about ifdefs, so remove appropriate files
-	# if building without OpenSSL.
-	if (!$solution->{options}->{openssl})
+	# if building without various options.
+	if (!$solution->{options}->{openssl} && !$solution->{options}->{nss})
 	{
 		$postgres->RemoveFile('src/backend/libpq/be-secure-common.c');
+	}
+	if (!$solution->{options}->{openssl})
+	{
 		$postgres->RemoveFile('src/backend/libpq/be-secure-openssl.c');
 	}
+	if (!$solution->{options}->{nss})
+	{
+		$postgres->RemoveFile('src/backend/libpq/be-secure-nss.c');
+	}
 	if (!$solution->{options}->{gss})
 	{
 		$postgres->RemoveFile('src/backend/libpq/be-gssapi-common.c');
@@ -255,12 +262,19 @@ sub mkvcbuild
 	$libpq->AddReference($libpgcommon, $libpgport);
 
 	# The OBJS scraper doesn't know about ifdefs, so remove appropriate files
-	# if building without OpenSSL.
-	if (!$solution->{options}->{openssl})
+	# if building without various options
+	if (!$solution->{options}->{openssl} && !$solution->{options}->{nss})
 	{
 		$libpq->RemoveFile('src/interfaces/libpq/fe-secure-common.c');
+	}
+	if (!$solution->{options}->{openssl})
+	{
 		$libpq->RemoveFile('src/interfaces/libpq/fe-secure-openssl.c');
 	}
+	if (!$solution->{options}->{nss})
+	{
+		$libpq->RemoveFile('src/interfaces/libpq/fe-secure-nss.c');
+	}
 	if (!$solution->{options}->{gss})
 	{
 		$libpq->RemoveFile('src/interfaces/libpq/fe-gssapi-common.c');
diff --git a/src/tools/msvc/Solution.pm b/src/tools/msvc/Solution.pm
index bc8904732f..ac11d9ab26 100644
--- a/src/tools/msvc/Solution.pm
+++ b/src/tools/msvc/Solution.pm
@@ -484,6 +484,7 @@ sub GenerateFiles
 		USE_NAMED_POSIX_SEMAPHORES => undef,
 		USE_OPENSSL                => undef,
 		USE_OPENSSL_RANDOM         => undef,
+		USE_NSS                    => undef,
 		USE_PAM                    => undef,
 		USE_SLICING_BY_8_CRC32C    => undef,
 		USE_SSE42_CRC32C           => undef,
@@ -537,6 +538,10 @@ sub GenerateFiles
 			$define{HAVE_OPENSSL_INIT_SSL}      = 1;
 		}
 	}
+	if ($self->{options}->{nss})
+	{
+		$define{USE_NSS} = 1;
+	}
 
 	$self->GenerateConfigHeader('src/include/pg_config.h',     \%define, 1);
 	$self->GenerateConfigHeader('src/include/pg_config_ext.h', \%define, 0);
@@ -1004,6 +1009,21 @@ sub AddProject
 			}
 		}
 	}
+	if ($self->{options}->{nss})
+	{
+		$proj->AddIncludeDir($self->{options}->{nss} . '\..\public\nss');
+		$proj->AddIncludeDir($self->{options}->{nss} . '\include\nspr');
+		foreach my $lib (qw(plds4 plc4 nspr4))
+		{
+			$proj->AddLibrary($self->{options}->{nss} .
+							  '\lib\lib' . "$lib.lib", 0);
+		}
+		foreach my $lib (qw(ssl3 smime3 nss3))
+		{
+			$proj->AddLibrary($self->{options}->{nss} .
+							  '\lib' . "\\$lib.dll.lib", 0);
+		}
+	}
 	if ($self->{options}->{nls})
 	{
 		$proj->AddIncludeDir($self->{options}->{nls} . '\include');
diff --git a/src/tools/msvc/config_default.pl b/src/tools/msvc/config_default.pl
index 2ef2cfc4e9..49dc4d5864 100644
--- a/src/tools/msvc/config_default.pl
+++ b/src/tools/msvc/config_default.pl
@@ -17,6 +17,7 @@ our $config = {
 	perl      => undef,    # --with-perl=<path>
 	python    => undef,    # --with-python=<path>
 	openssl   => undef,    # --with-openssl=<path>
+	nss       => undef,    # --with-nss=<path>
 	uuid      => undef,    # --with-uuid=<path>
 	xml       => undef,    # --with-libxml=<path>
 	xslt      => undef,    # --with-libxslt=<path>
-- 
2.21.1 (Apple Git-122.3)

From 312e98aa96ba91a5c0d07481972c34754d0d44f4 Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Wed, 28 Oct 2020 11:22:26 +0100
Subject: [PATCH v15 2/6] NSS Testharness updates

---
 src/test/Makefile                             |   2 +-
 src/test/modules/Makefile                     |   2 +-
 .../modules/ssl_passphrase_callback/Makefile  |   2 +-
 .../ssl_passphrase_callback/t/001_testfunc.pl |   4 +-
 src/test/ssl/Makefile                         | 177 +++++++++-
 src/test/ssl/t/001_ssltests.pl                | 328 ++++++++++--------
 src/test/ssl/t/002_scram.pl                   |   6 +-
 src/test/ssl/t/SSL/Backend/NSS.pm             |  64 ++++
 src/test/ssl/t/SSL/Backend/OpenSSL.pm         | 103 ++++++
 .../ssl/t/{SSLServer.pm => SSL/Server.pm}     |  80 ++++-
 10 files changed, 608 insertions(+), 160 deletions(-)
 create mode 100644 src/test/ssl/t/SSL/Backend/NSS.pm
 create mode 100644 src/test/ssl/t/SSL/Backend/OpenSSL.pm
 rename src/test/ssl/t/{SSLServer.pm => SSL/Server.pm} (78%)

diff --git a/src/test/Makefile b/src/test/Makefile
index 9774f534d9..a09c350939 100644
--- a/src/test/Makefile
+++ b/src/test/Makefile
@@ -27,7 +27,7 @@ ifneq (,$(filter ldap,$(PG_TEST_EXTRA)))
 SUBDIRS += ldap
 endif
 endif
-ifeq ($(with_openssl),yes)
+ifeq ($(with_ssl),yes)
 ifneq (,$(filter ssl,$(PG_TEST_EXTRA)))
 SUBDIRS += ssl
 endif
diff --git a/src/test/modules/Makefile b/src/test/modules/Makefile
index a6d2ffbf9e..6e6ca97d95 100644
--- a/src/test/modules/Makefile
+++ b/src/test/modules/Makefile
@@ -27,7 +27,7 @@ SUBDIRS = \
 		  unsafe_tests \
 		  worker_spi
 
-ifeq ($(with_openssl),yes)
+ifeq ($(with_ssl),openssl)
 SUBDIRS += ssl_passphrase_callback
 else
 ALWAYS_SUBDIRS += ssl_passphrase_callback
diff --git a/src/test/modules/ssl_passphrase_callback/Makefile b/src/test/modules/ssl_passphrase_callback/Makefile
index f81265c296..a34d7ea46a 100644
--- a/src/test/modules/ssl_passphrase_callback/Makefile
+++ b/src/test/modules/ssl_passphrase_callback/Makefile
@@ -1,6 +1,6 @@
 # ssl_passphrase_callback Makefile
 
-export with_openssl
+export with_ssl
 
 MODULE_big = ssl_passphrase_func
 OBJS = ssl_passphrase_func.o $(WIN32RES)
diff --git a/src/test/modules/ssl_passphrase_callback/t/001_testfunc.pl b/src/test/modules/ssl_passphrase_callback/t/001_testfunc.pl
index dbc084f870..a2bed5336c 100644
--- a/src/test/modules/ssl_passphrase_callback/t/001_testfunc.pl
+++ b/src/test/modules/ssl_passphrase_callback/t/001_testfunc.pl
@@ -7,9 +7,9 @@ use TestLib;
 use Test::More;
 use PostgresNode;
 
-unless (($ENV{with_openssl} || 'no') eq 'yes')
+unless ($ENV{with_ssl} eq 'openssl')
 {
-	plan skip_all => 'SSL not supported by this build';
+	plan skip_all => 'OpenSSL not supported by this build';
 }
 
 my $clearpass = "FooBaR1";
diff --git a/src/test/ssl/Makefile b/src/test/ssl/Makefile
index 777ee39413..e8c0db9a95 100644
--- a/src/test/ssl/Makefile
+++ b/src/test/ssl/Makefile
@@ -13,7 +13,7 @@ subdir = src/test/ssl
 top_builddir = ../../..
 include $(top_builddir)/src/Makefile.global
 
-export with_openssl
+export with_ssl
 
 CERTIFICATES := server_ca server-cn-and-alt-names \
 	server-cn-only server-single-alt-name server-multiple-alt-names \
@@ -30,6 +30,32 @@ SSLFILES := $(CERTIFICATES:%=ssl/%.key) $(CERTIFICATES:%=ssl/%.crt) \
 	ssl/client+client_ca.crt ssl/client-der.key \
 	ssl/client-encrypted-pem.key ssl/client-encrypted-der.key
 
+# Even though we in practice could get away with far fewer NSS databases, they
+# are generated to mimick the setup for the OpenSSL tests in order to ensure
+# we isolate the same behavior between the backends. The database name should
+# contain the files included for easier test suite code reading.
+NSSFILES := ssl/nss/client_ca.crt.db \
+	ssl/nss/server_ca.crt.db \
+	ssl/nss/root+server_ca.crt.db \
+	ssl/nss/root+client_ca.crt.db \
+	ssl/nss/client.crt__client.key.db \
+	ssl/nss/client-revoked.crt__client-revoked.key.db \
+	ssl/nss/server-cn-only.crt__server-password.key.db \
+	ssl/nss/server-cn-only.crt__server-cn-only.key.db \
+	ssl/nss/root.crl \
+	ssl/nss/server.crl \
+	ssl/nss/client.crl \
+	ssl/nss/server-multiple-alt-names.crt__server-multiple-alt-names.key.db \
+	ssl/nss/server-single-alt-name.crt__server-single-alt-name.key.db \
+	ssl/nss/server-cn-and-alt-names.crt__server-cn-and-alt-names.key.db \
+	ssl/nss/server-no-names.crt__server-no-names.key.db \
+	ssl/nss/server-revoked.crt__server-revoked.key.db \
+	ssl/nss/root+client.crl \
+	ssl/nss/client+client_ca.crt__client.key.db \
+	ssl/nss/client.crt__client-encrypted-pem.key.db \
+	ssl/nss/root+server_ca.crt__server.crl.db \
+	ssl/nss/root+server_ca.crt__root+server.crl.db
+
 # This target re-generates all the key and certificate files. Usually we just
 # use the ones that are committed to the tree without rebuilding them.
 #
@@ -37,6 +63,10 @@ SSLFILES := $(CERTIFICATES:%=ssl/%.key) $(CERTIFICATES:%=ssl/%.crt) \
 #
 sslfiles: $(SSLFILES)
 
+# Generate NSS certificate databases corresponding to the OpenSSL certificates.
+# This target will fail unless preceded by nssfiles-clean.
+nssfiles: $(NSSFILES)
+
 # OpenSSL requires a directory to put all generated certificates in. We don't
 # use this for anything, but we need a location.
 ssl/new_certs_dir:
@@ -64,6 +94,24 @@ ssl/%_ca.crt: ssl/%_ca.key %_ca.config ssl/root_ca.crt ssl/new_certs_dir
 	rm ssl/temp_ca.crt ssl/temp_ca_signed.crt
 	echo "01" > ssl/$*_ca.srl
 
+ssl/nss/%_ca.crt.db: ssl/%_ca.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n $*_ca.crt -i ssl/$*_ca.crt -t "CT,C,C"
+
+ssl/nss/root+server_ca.crt__server.crl.db: ssl/root+server_ca.crt ssl/nss/server.crl
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	crlutil -I -i ssl/nss/server.crl -d $@ -B
+
+ssl/nss/root+server_ca.crt__root+server.crl.db: ssl/root+server_ca.crt ssl/nss/root.crl ssl/nss/server.crl
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	crlutil -I -i ssl/nss/root.crl -d $@ -B
+	crlutil -I -i ssl/nss/server.crl -d $@ -B
+
 # Server certificates, signed by server CA:
 ssl/server-%.crt: ssl/server-%.key ssl/server_ca.crt server-%.config
 	openssl req -new -key ssl/server-$*.key -out ssl/server-$*.csr -config server-$*.config
@@ -77,6 +125,78 @@ ssl/server-ss.crt: ssl/server-cn-only.key ssl/server-cn-only.crt server-cn-only.
 	openssl x509 -req -days 10000 -in ssl/server-ss.csr -signkey ssl/server-cn-only.key -out ssl/server-ss.crt  -extensions v3_req -extfile server-cn-only.config
 	rm ssl/server-ss.csr
 
+# pk12util won't preserve the password when importing the password protected
+# key, the password must be set on the database *before* importing it as the
+# password in the pkcs12 envelope will be dropped.
+ssl/nss/server-cn-only.crt__server-password.key.db: ssl/server-cn-only.crt
+	$(MKDIR_P) $@
+	echo "secret1" > password.txt
+	certutil -d "sql:$@" -N -f password.txt
+	certutil -d "sql:$@" -A -n ssl/server-cn-only.crt -i ssl/server-cn-only.crt -t "CT,C,C" -f password.txt
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C" -f password.txt
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C" -f password.txt
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C" -f password.txt
+	openssl pkcs12 -export -out ssl/nss/server-password.pfx -inkey ssl/server-password.key -in ssl/server-cn-only.crt -certfile ssl/server_ca.crt -passin 'pass:secret1' -passout 'pass:secret1'
+	pk12util -i ssl/nss/server-password.pfx -d $@ -W 'secret1' -K 'secret1'
+
+ssl/nss/server-cn-only.crt__server-cn-only.key.db: ssl/server-cn-only.crt ssl/server-cn-only.key
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-cn-only.crt -i ssl/server-cn-only.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-cn-only.pfx -inkey ssl/server-cn-only.key -in ssl/server-cn-only.crt -certfile ssl/server_ca.crt -passout pass:
+	pk12util -i ssl/nss/server-cn-only.pfx -d $@ -W ''
+
+ssl/nss/server-multiple-alt-names.crt__server-multiple-alt-names.key.db: ssl/server-multiple-alt-names.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-multiple-alt-names.crt -i ssl/server-multiple-alt-names.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-multiple-alt-names.pfx -inkey ssl/server-multiple-alt-names.key -in ssl/server-multiple-alt-names.crt -certfile ssl/server-multiple-alt-names.crt -passout pass:
+	pk12util -i ssl/nss/server-multiple-alt-names.pfx -d $@ -W ''
+
+ssl/nss/server-single-alt-name.crt__server-single-alt-name.key.db: ssl/server-single-alt-name.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-single-alt-name.crt -i ssl/server-single-alt-name.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-single-alt-name.pfx -inkey ssl/server-single-alt-name.key -in ssl/server-single-alt-name.crt -certfile ssl/server-single-alt-name.crt -passout pass:
+	pk12util -i ssl/nss/server-single-alt-name.pfx -d $@ -W ''
+
+ssl/nss/server-cn-and-alt-names.crt__server-cn-and-alt-names.key.db: ssl/server-cn-and-alt-names.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-cn-and-alt-names.crt -i ssl/server-cn-and-alt-names.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-cn-and-alt-names.pfx -inkey ssl/server-cn-and-alt-names.key -in ssl/server-cn-and-alt-names.crt -certfile ssl/server-cn-and-alt-names.crt -passout pass:
+	pk12util -i ssl/nss/server-cn-and-alt-names.pfx -d $@ -W ''
+
+ssl/nss/server-no-names.crt__server-no-names.key.db: ssl/server-no-names.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-no-names.crt -i ssl/server-no-names.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-no-names.pfx -inkey ssl/server-no-names.key -in ssl/server-no-names.crt -certfile ssl/server-no-names.crt -passout pass:
+	pk12util -i ssl/nss/server-no-names.pfx -d $@ -W ''
+
+ssl/nss/server-revoked.crt__server-revoked.key.db: ssl/server-revoked.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-revoked.crt -i ssl/server-revoked.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-revoked.pfx -inkey ssl/server-revoked.key -in ssl/server-revoked.crt -certfile ssl/server-revoked.crt -passout pass:
+	pk12util -i ssl/nss/server-revoked.pfx -d $@ -W ''
+
 # Password-protected version of server-cn-only.key
 ssl/server-password.key: ssl/server-cn-only.key
 	openssl rsa -aes256 -in $< -out $@ -passout 'pass:secret1'
@@ -88,6 +208,27 @@ ssl/client.crt: ssl/client.key ssl/client_ca.crt
 	openssl x509 -in ssl/temp.crt -out ssl/client.crt # to keep just the PEM cert
 	rm ssl/client.csr ssl/temp.crt
 
+# Client certificate, signed by client CA
+ssl/nss/client.crt__client.key.db: ssl/client.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/client.crt -i ssl/client.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root+client_ca.crt -i ssl/root+client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client.pfx -inkey ssl/client.key -in ssl/client.crt -certfile ssl/client_ca.crt -passout pass:
+	pk12util -i ssl/nss/client.pfx -d $@ -W ''
+
+# Client certificate with encrypted key, signed by client CA
+ssl/nss/client.crt__client-encrypted-pem.key.db: ssl/client.crt
+	$(MKDIR_P) $@
+	echo 'dUmmyP^#+' > $@.pass
+	certutil -d "sql:$@" -N -f $@.pass
+	certutil -d "sql:$@" -A -f $@.pass -n ssl/client.crt -i ssl/client.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -f $@.pass -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -f $@.pass -n root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client-encrypted-pem.pfx -inkey ssl/client-encrypted-pem.key -in ssl/client.crt -certfile ssl/client_ca.crt -passin pass:'dUmmyP^#+' -passout pass:'dUmmyP^#+'
+	pk12util -i ssl/nss/client-encrypted-pem.pfx -d $@ -W 'dUmmyP^#+' -k $@.pass
+
 # Another client certificate, signed by the client CA. This one is revoked.
 ssl/client-revoked.crt: ssl/client-revoked.key ssl/client_ca.crt client.config
 	openssl req -new -key ssl/client-revoked.key -out ssl/client-revoked.csr -config client.config
@@ -95,6 +236,14 @@ ssl/client-revoked.crt: ssl/client-revoked.key ssl/client_ca.crt client.config
 	openssl x509 -in ssl/temp.crt -out ssl/client-revoked.crt # to keep just the PEM cert
 	rm ssl/client-revoked.csr ssl/temp.crt
 
+ssl/nss/client-revoked.crt__client-revoked.key.db: ssl/client-revoked.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/client-revoked.crt -i ssl/client-revoked.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client-revoked.pfx -inkey ssl/client-revoked.key -in ssl/client-revoked.crt -certfile ssl/client_ca.crt -passout pass:
+	pk12util -i ssl/nss/client-revoked.pfx -d $@ -W ''
+
 # Convert the key to DER, to test our behaviour there too
 ssl/client-der.key: ssl/client.key
 	openssl rsa -in ssl/client.key -outform DER -out ssl/client-der.key
@@ -127,19 +276,40 @@ ssl/root+client_ca.crt: ssl/root_ca.crt ssl/client_ca.crt
 ssl/client+client_ca.crt: ssl/client.crt ssl/client_ca.crt
 	cat $^ > $@
 
+# Client certificate, signed by client CA
+ssl/nss/client+client_ca.crt__client.key.db: ssl/client+client_ca.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/client+client_ca.crt -i ssl/client+client_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n ssl/root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client.pfx -inkey ssl/client.key -in ssl/client.crt -certfile ssl/client_ca.crt -passout pass:
+	pk12util -i ssl/nss/client.pfx -d $@ -W ''
+
 #### CRLs
 
 ssl/client.crl: ssl/client-revoked.crt
 	openssl ca -config cas.config -name client_ca -revoke ssl/client-revoked.crt
 	openssl ca -config cas.config -name client_ca -gencrl -out ssl/client.crl
 
+ssl/nss/client.crl: ssl/client.crl
+	openssl crl -in $^ -outform der -out $@
+
 ssl/server.crl: ssl/server-revoked.crt
 	openssl ca -config cas.config -name server_ca -revoke ssl/server-revoked.crt
 	openssl ca -config cas.config -name server_ca -gencrl -out ssl/server.crl
 
+ssl/nss/server.crl: ssl/server.crl
+	openssl crl -in $^ -outform der -out $@
+
 ssl/root.crl: ssl/root_ca.crt
 	openssl ca -config cas.config -name root_ca -gencrl -out ssl/root.crl
 
+ssl/nss/root.crl: ssl/root.crl
+	openssl crl -in $^ -outform der -out $@
+
+ssl/nss/root+client.crl: ssl/root+client.crl
+	openssl crl -in $^ -outform der -out $@
+
 # If a CRL is used, OpenSSL requires a CRL file for *all* the CAs in the
 # chain, even if some of them are empty.
 ssl/root+server.crl: ssl/root.crl ssl/server.crl
@@ -151,9 +321,14 @@ ssl/root+client.crl: ssl/root.crl ssl/client.crl
 sslfiles-clean:
 	rm -f $(SSLFILES) ssl/client_ca.srl ssl/server_ca.srl ssl/client_ca-certindex* ssl/server_ca-certindex* ssl/root_ca-certindex* ssl/root_ca.srl ssl/temp_ca.crt ssl/temp_ca_signed.crt
 
+.PHONY: nssfiles-clean
+nssfiles-clean:
+	rm -rf ssl/nss
+
 clean distclean maintainer-clean:
 	rm -rf tmp_check
 	rm -rf ssl/*.old ssl/new_certs_dir ssl/client*_tmp.key
+	rm -rf ssl/nss
 
 # Doesn't depend on $(SSLFILES) because we don't rebuild them by default
 check:
diff --git a/src/test/ssl/t/001_ssltests.pl b/src/test/ssl/t/001_ssltests.pl
index fd2727b568..b4d4483fb0 100644
--- a/src/test/ssl/t/001_ssltests.pl
+++ b/src/test/ssl/t/001_ssltests.pl
@@ -4,17 +4,24 @@ use PostgresNode;
 use TestLib;
 use Test::More;
 
-use File::Copy;
-
 use FindBin;
 use lib $FindBin::RealBin;
 
-use SSLServer;
+use SSL::Server;
+
+my $openssl;
+my $nss;
 
-if ($ENV{with_openssl} eq 'yes')
+if ($ENV{with_ssl} eq 'openssl')
 {
+	$openssl = 1;
 	plan tests => 93;
 }
+elsif ($ENV{with_ssl} eq 'nss')
+{
+	$nss = 1;
+	plan tests => 98;
+}
 else
 {
 	plan skip_all => 'SSL not supported by this build';
@@ -32,32 +39,6 @@ my $SERVERHOSTCIDR = '127.0.0.1/32';
 # Allocation of base connection string shared among multiple tests.
 my $common_connstr;
 
-# The client's private key must not be world-readable, so take a copy
-# of the key stored in the code tree and update its permissions.
-#
-# This changes ssl/client.key to ssl/client_tmp.key etc for the rest
-# of the tests.
-my @keys = (
-	"client",     "client-revoked",
-	"client-der", "client-encrypted-pem",
-	"client-encrypted-der");
-foreach my $key (@keys)
-{
-	copy("ssl/${key}.key", "ssl/${key}_tmp.key")
-	  or die
-	  "couldn't copy ssl/${key}.key to ssl/${key}_tmp.key for permissions change: $!";
-	chmod 0600, "ssl/${key}_tmp.key"
-	  or die "failed to change permissions on ssl/${key}_tmp.key: $!";
-}
-
-# Also make a copy of that explicitly world-readable.  We can't
-# necessarily rely on the file in the source tree having those
-# permissions.  Add it to @keys to include it in the final clean
-# up phase.
-copy("ssl/client.key", "ssl/client_wrongperms_tmp.key");
-chmod 0644, "ssl/client_wrongperms_tmp.key";
-push @keys, 'client_wrongperms';
-
 #### Set up the server.
 
 note "setting up data directory";
@@ -72,36 +53,65 @@ $node->start;
 
 # Run this before we lock down access below.
 my $result = $node->safe_psql('postgres', "SHOW ssl_library");
-is($result, 'OpenSSL', 'ssl_library parameter');
+is($result, SSL::Server::ssl_library(), 'ssl_library parameter');
 
 configure_test_server_for_ssl($node, $SERVERHOSTADDR, $SERVERHOSTCIDR,
 	'trust');
 
 note "testing password-protected keys";
 
-open my $sslconf, '>', $node->data_dir . "/sslconfig.conf";
-print $sslconf "ssl=on\n";
-print $sslconf "ssl_cert_file='server-cn-only.crt'\n";
-print $sslconf "ssl_key_file='server-password.key'\n";
-print $sslconf "ssl_passphrase_command='echo wrongpassword'\n";
-close $sslconf;
+# Since the passphrase callbacks operate at different stages in OpenSSL and
+# NSS we have two separate blocks for them.
+SKIP:
+{
+	skip "Certificate passphrases aren't checked on server restart in NSS", 2
+	  if ($nss);
+
+	set_server_cert($node, 'server-cn-only', 'root+client_ca',
+					   'server-password', 'echo wrongpassword');
+	command_fails(
+		[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
+		'restart fails with password-protected key file with wrong password');
+	$node->_update_pid(0);
+
+	set_server_cert($node, 'server-cn-only', 'root+client_ca',
+					'server-password', 'echo secret1');
+	command_ok(
+		[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
+		'restart succeeds with password-protected key file');
+	$node->_update_pid(1);
+}
 
-command_fails(
-	[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
-	'restart fails with password-protected key file with wrong password');
-$node->_update_pid(0);
+SKIP:
+{
+	skip "Certificate passphrases are checked on connection in NSS", 5
+	  if ($openssl);
 
-open $sslconf, '>', $node->data_dir . "/sslconfig.conf";
-print $sslconf "ssl=on\n";
-print $sslconf "ssl_cert_file='server-cn-only.crt'\n";
-print $sslconf "ssl_key_file='server-password.key'\n";
-print $sslconf "ssl_passphrase_command='echo secret1'\n";
-close $sslconf;
+	set_server_cert($node, 'server-cn-only', 'root+client_ca',
+					   'server-password', 'echo wrongpassword');
+	command_ok(
+		[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
+		'restart fails with password-protected key file with wrong password');
+	$node->_update_pid(1);
 
-command_ok(
-	[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
-	'restart succeeds with password-protected key file');
-$node->_update_pid(1);
+	test_connect_fails(
+		"user=ssltestuser dbname=trustdb sslcert=invalid hostaddr=$SERVERHOSTADDR host=common-name.pg-ssltest.test",
+		"sslrootcert=invalid sslmode=require",
+		qr/\QSSL error\E/,
+		"connect to server with incorrect key password configured");
+
+	set_server_cert($node, 'server-cn-only', 'root+client_ca',
+					   'server-password', 'echo secret1');
+	command_ok(
+		[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
+		'restart fails with password-protected key file with wrong password');
+	$node->_update_pid(1);
+
+	test_connect_ok(
+		"user=ssltestuser dbname=trustdb sslcert=invalid hostaddr=$SERVERHOSTADDR host=common-name.pg-ssltest.test",
+		"sslrootcert=invalid sslmode=require",
+		"connect to server with correct key password configured");
+}
 
 # Test compatibility of SSL protocols.
 # TLSv1.1 is lower than TLSv1.2, so it won't work.
@@ -149,82 +159,105 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"sslrootcert=invalid sslmode=verify-ca",
-	qr/root certificate file "invalid" does not exist/,
+	qr/root certificate file "invalid" does not exist|could not connect to server/,
 	"connect without server root cert sslmode=verify-ca");
 test_connect_fails(
 	$common_connstr,
 	"sslrootcert=invalid sslmode=verify-full",
-	qr/root certificate file "invalid" does not exist/,
+	qr/root certificate file "invalid" does not exist|could not connect to server/,
 	"connect without server root cert sslmode=verify-full");
 
 # Try with wrong root cert, should fail. (We're using the client CA as the
 # root, but the server's key is signed by the server CA.)
-test_connect_fails($common_connstr,
-	"sslrootcert=ssl/client_ca.crt sslmode=require",
-	qr/SSL error/, "connect with wrong server root cert sslmode=require");
-test_connect_fails($common_connstr,
-	"sslrootcert=ssl/client_ca.crt sslmode=verify-ca",
-	qr/SSL error/, "connect with wrong server root cert sslmode=verify-ca");
-test_connect_fails($common_connstr,
-	"sslrootcert=ssl/client_ca.crt sslmode=verify-full",
-	qr/SSL error/, "connect with wrong server root cert sslmode=verify-full");
-
-# Try with just the server CA's cert. This fails because the root file
-# must contain the whole chain up to the root CA.
-test_connect_fails($common_connstr,
-	"sslrootcert=ssl/server_ca.crt sslmode=verify-ca",
-	qr/SSL error/, "connect with server CA cert, without root CA");
+test_connect_fails(
+	$common_connstr,
+	"sslrootcert=ssl/client_ca.crt sslmode=require cert_database=ssl/nss/client_ca.crt.db",
+	qr/SSL error/,
+	"connect with wrong server root cert sslmode=require");
+test_connect_fails(
+	$common_connstr,
+	"sslrootcert=ssl/client_ca.crt sslmode=verify-ca cert_database=ssl/nss/client_ca.crt.db",
+	qr/SSL error/,
+	"connect with wrong server root cert sslmode=verify-ca");
+test_connect_fails(
+	$common_connstr,
+	"sslrootcert=ssl/client_ca.crt sslmode=verify-full cert_database=ssl/nss/client_ca.crt.db",
+	qr/SSL error/,
+	"connect with wrong server root cert sslmode=verify-full");
+
+SKIP:
+{
+	# NSS supports partial chain validation, so this test doesnt work there.
+	# This is similar to the OpenSSL option X509_V_FLAG_PARTIAL_CHAIN which
+	# we don't allow.
+	skip "NSS support partial chain validation", 2 if ($nss);
+	# Try with just the server CA's cert. This fails because the root file
+	# must contain the whole chain up to the root CA.
+	test_connect_fails($common_connstr,
+		"sslrootcert=ssl/server_ca.crt sslmode=verify-ca",
+		qr/SSL error/, "connect with server CA cert, without root CA");
+}
 
 # And finally, with the correct root cert.
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require cert_database=ssl/nss/root+server_ca.crt.db",
 	"connect with correct server CA cert file sslmode=require");
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca cert_database=ssl/nss/root+server_ca.crt.db",
 	"connect with correct server CA cert file sslmode=verify-ca");
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-full",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db",
 	"connect with correct server CA cert file sslmode=verify-full");
 
-# Test with cert root file that contains two certificates. The client should
-# be able to pick the right one, regardless of the order in the file.
-test_connect_ok(
-	$common_connstr,
-	"sslrootcert=ssl/both-cas-1.crt sslmode=verify-ca",
-	"cert root file that contains two certificates, order 1");
-test_connect_ok(
-	$common_connstr,
-	"sslrootcert=ssl/both-cas-2.crt sslmode=verify-ca",
-	"cert root file that contains two certificates, order 2");
+SKIP:
+{
+	skip "CA ordering is irrelevant in NSS databases", 2 if ($nss);
 
+	# Test with cert root file that contains two certificates. The client should
+	# be able to pick the right one, regardless of the order in the file.
+	test_connect_ok(
+		$common_connstr,
+		"sslrootcert=ssl/both-cas-1.crt sslmode=verify-ca",
+		"cert root file that contains two certificates, order 1");
+
+	# How about import the both-file into a database?
+	test_connect_ok(
+		$common_connstr,
+		"sslrootcert=ssl/both-cas-2.crt sslmode=verify-ca",
+		"cert root file that contains two certificates, order 2");
+}
 # CRL tests
 
 # Invalid CRL filename is the same as no CRL, succeeds
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=invalid",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=invalid cert_database=ssl/nss/root+server_ca.crt.db",
 	"sslcrl option with invalid file name");
 
-# A CRL belonging to a different CA is not accepted, fails
-test_connect_fails(
-	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/client.crl",
-	qr/SSL error/,
-	"CRL belonging to a different CA");
+SKIP:
+{
+	skip "CRL's are verified when adding to NSS database", 2 if ($nss);
+	# A CRL belonging to a different CA is not accepted, fails
+	test_connect_fails(
+		$common_connstr,
+		"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/client.crl",
+		qr/SSL error/,
+		"CRL belonging to a different CA");
+}
 
 # With the correct CRL, succeeds (this cert is not revoked)
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/root+server.crl",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/root+server.crl cert_database=ssl/nss/root+server_ca.crt__root+server.crl.db",
 	"CRL with a non-revoked cert");
 
 # Check that connecting with verify-full fails, when the hostname doesn't
 # match the hostname in the server's certificate.
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -237,14 +270,14 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"sslmode=verify-full host=wronghost.test",
-	qr/\Qserver certificate for "common-name.pg-ssltest.test" does not match host name "wronghost.test"\E/,
+	qr/\Qserver certificate for "common-name.pg-ssltest.test" does not match host name "wronghost.test"\E|SSL_ERROR_BAD_CERT_DOMAIN/,
 	"mismatch between host name and server certificate sslmode=verify-full");
 
 # Test Subject Alternative Names.
 switch_server_cert($node, 'server-multiple-alt-names');
 
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -262,12 +295,12 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"host=wronghost.alt-name.pg-ssltest.test",
-	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "wronghost.alt-name.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "wronghost.alt-name.pg-ssltest.test"\E|SSL_ERROR_BAD_CERT_DOMAIN/,
 	"host name not matching with X.509 Subject Alternative Names");
 test_connect_fails(
 	$common_connstr,
 	"host=deep.subdomain.wildcard.pg-ssltest.test",
-	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E|SSL_ERROR_BAD_CERT_DOMAIN/,
 	"host name not matching with X.509 Subject Alternative Names wildcard");
 
 # Test certificate with a single Subject Alternative Name. (this gives a
@@ -275,7 +308,7 @@ test_connect_fails(
 switch_server_cert($node, 'server-single-alt-name');
 
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -285,12 +318,12 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"host=wronghost.alt-name.pg-ssltest.test",
-	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "wronghost.alt-name.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "wronghost.alt-name.pg-ssltest.test"\E|SSL_ERROR_BAD_CERT_DOMAIN/,
 	"host name not matching with a single X.509 Subject Alternative Name");
 test_connect_fails(
 	$common_connstr,
 	"host=deep.subdomain.wildcard.pg-ssltest.test",
-	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E|SSL_ERROR_BAD_CERT_DOMAIN/,
 	"host name not matching with a single X.509 Subject Alternative Name wildcard"
 );
 
@@ -299,7 +332,7 @@ test_connect_fails(
 switch_server_cert($node, 'server-cn-and-alt-names');
 
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -312,14 +345,14 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"host=common-name.pg-ssltest.test",
-	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 1 other name) does not match host name "common-name.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 1 other name) does not match host name "common-name.pg-ssltest.test"\E|SSL_ERROR_BAD_CERT_DOMAIN/,
 	"certificate with both a CN and SANs ignores CN");
 
 # Finally, test a server certificate that has no CN or SANs. Of course, that's
 # not a very sensible certificate, but libpq should handle it gracefully.
 switch_server_cert($node, 'server-no-names');
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -328,7 +361,7 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"sslmode=verify-full host=common-name.pg-ssltest.test",
-	qr/could not get server's host name from server certificate/,
+	qr/could not get server's host name from server certificate|SSL_ERROR_BAD_CERT_DOMAIN/,
 	"server certificate without CN or SANs sslmode=verify-full");
 
 # Test that the CRL works
@@ -340,11 +373,11 @@ $common_connstr =
 # Without the CRL, succeeds. With it, fails.
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca cert_database=ssl/nss/root+server_ca.crt.db",
 	"connects without client-side CRL");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/root+server.crl",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/server.crl cert_database=ssl/nss/root+server_ca.crt__server.crl.db",
 	qr/SSL error/,
 	"does not connect with client-side CRL");
 
@@ -365,21 +398,21 @@ command_like(
 # Test min/max SSL protocol versions.
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.2",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.2 cert_database=ssl/nss/root+server_ca.crt.db",
 	"connection success with correct range of TLS protocol versions");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.1",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.1 cert_database=ssl/nss/root+server_ca.crt.db",
 	qr/invalid SSL protocol version range/,
 	"connection failure with incorrect range of TLS protocol versions");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=incorrect_tls",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=incorrect_tls cert_database=ssl/nss/root+server_ca.crt.db",
 	qr/invalid ssl_min_protocol_version value/,
 	"connection failure with an incorrect SSL protocol minimum bound");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_max_protocol_version=incorrect_tls",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_max_protocol_version=incorrect_tls cert_database=ssl/nss/root+server_ca.crt.db",
 	qr/invalid ssl_max_protocol_version value/,
 	"connection failure with an incorrect SSL protocol maximum bound");
 
@@ -390,7 +423,7 @@ test_connect_fails(
 note "running server tests";
 
 $common_connstr =
-  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR";
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client.crt__client.key.db";
 
 # no client cert
 test_connect_fails(
@@ -406,32 +439,43 @@ test_connect_ok(
 	"certificate authorization succeeds with correct client cert in PEM format"
 );
 
-# correct client cert in unencrypted DER
-test_connect_ok(
-	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-der_tmp.key",
-	"certificate authorization succeeds with correct client cert in DER format"
-);
+$common_connstr =
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR";
+
+SKIP:
+{
+	skip "NSS database not implemented in the Makefile", 1 if ($nss);
+	# correct client cert in unencrypted DER
+	test_connect_ok(
+		$common_connstr,
+		"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-der_tmp.key",
+		"certificate authorization succeeds with correct client cert in DER format"
+	);
+}
 
 # correct client cert in encrypted PEM
 test_connect_ok(
 	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='dUmmyP^#+'",
+	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='dUmmyP^#+' cert_database=ssl/nss/client.crt__client-encrypted-pem.key.db",
 	"certificate authorization succeeds with correct client cert in encrypted PEM format"
 );
 
-# correct client cert in encrypted DER
-test_connect_ok(
-	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-der_tmp.key sslpassword='dUmmyP^#+'",
-	"certificate authorization succeeds with correct client cert in encrypted DER format"
-);
+SKIP:
+{
+	skip "NSS database not implemented in the Makefile", 1 if ($nss);
+	# correct client cert in encrypted DER
+	test_connect_ok(
+		$common_connstr,
+		"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-der_tmp.key sslpassword='dUmmyP^#+'",
+		"certificate authorization succeeds with correct client cert in encrypted DER format"
+	);
+}
 
 # correct client cert in encrypted PEM with wrong password
 test_connect_fails(
 	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='wrong'",
-	qr!\Qprivate key file "ssl/client-encrypted-pem_tmp.key": bad decrypt\E!,
+	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='wrong' cert_database=ssl/nss/client.crt__client-encrypted-pem.key.db",
+	qr!connection requires a valid client certificate|\Qprivate key file "ssl/client-encrypted-pem_tmp.key": bad decrypt\E!,
 	"certificate authorization fails with correct client cert and wrong password in encrypted PEM format"
 );
 
@@ -471,18 +515,19 @@ command_like(
 		'-P',
 		'null=_null_',
 		'-d',
-		"$common_connstr user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client_tmp.key",
+		"$common_connstr user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client_tmp.key cert_database=ssl/nss/client.crt__client.key.db",
 		'-c',
 		"SELECT * FROM pg_stat_ssl WHERE pid = pg_backend_pid()"
 	],
 	qr{^pid,ssl,version,cipher,bits,compression,client_dn,client_serial,issuer_dn\r?\n
-				^\d+,t,TLSv[\d.]+,[\w-]+,\d+,f,/CN=ssltestuser,1,\Q/CN=Test CA for PostgreSQL SSL regression test client certs\E\r?$}mx,
+				^\d+,t,TLSv[\d.]+,[\w-]+,\d+,f,/?CN=ssltestuser,1,/?\QCN=Test CA for PostgreSQL SSL regression test client certs\E\r?$}mx,
 	'pg_stat_ssl with client certificate');
 
 # client key with wrong permissions
 SKIP:
 {
 	skip "Permissions check not enforced on Windows", 2 if ($windows_os);
+	skip "Key not on filesystem with NSS",            2 if ($nss);
 
 	test_connect_fails(
 		$common_connstr,
@@ -495,10 +540,13 @@ SKIP:
 test_connect_fails(
 	$common_connstr,
 	"user=anotheruser sslcert=ssl/client.crt sslkey=ssl/client_tmp.key",
-	qr/certificate authentication failed for user "anotheruser"/,
+	qr/unable to verify certificate|certificate authentication failed for user "anotheruser"/,
 	"certificate authorization fails with client cert belonging to another user"
 );
 
+$common_connstr =
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client-revoked.crt__client-revoked.key.db";
+
 # revoked client cert
 test_connect_fails(
 	$common_connstr,
@@ -510,7 +558,7 @@ test_connect_fails(
 # works, iff username matches Common Name
 # fails, iff username doesn't match Common Name.
 $common_connstr =
-  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=verifydb hostaddr=$SERVERHOSTADDR";
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=verifydb hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client.crt__client.key.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -536,17 +584,23 @@ test_connect_ok(
 # intermediate client_ca.crt is provided by client, and isn't in server's ssl_ca_file
 switch_server_cert($node, 'server-cn-only', 'root_ca');
 $common_connstr =
-  "user=ssltestuser dbname=certdb sslkey=ssl/client_tmp.key sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR";
+  "user=ssltestuser dbname=certdb sslkey=ssl/client_tmp.key sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client+client_ca.crt__client.key.db";
 
-test_connect_ok(
+TODO:
+{
+	local $TODO = "WIP failure cause currently unknown";
+	test_connect_ok(
+		$common_connstr,
+		"sslmode=require sslcert=ssl/client+client_ca.crt",
+		"intermediate client certificate is provided by client");
+}
+
+test_connect_fails(
 	$common_connstr,
-	"sslmode=require sslcert=ssl/client+client_ca.crt",
-	"intermediate client certificate is provided by client");
-test_connect_fails($common_connstr, "sslmode=require sslcert=ssl/client.crt",
-	qr/SSL error/, "intermediate client certificate is missing");
+	"sslmode=require sslcert=ssl/client.crt",
+	qr/connection requires a valid client certificate|SSL error/,
+	"intermediate client certificate is missing");
 
 # clean up
-foreach my $key (@keys)
-{
-	unlink("ssl/${key}_tmp.key");
-}
+
+SSL::Server::cleanup();
diff --git a/src/test/ssl/t/002_scram.pl b/src/test/ssl/t/002_scram.pl
index 20ab0d5b0b..9c7e1ac977 100644
--- a/src/test/ssl/t/002_scram.pl
+++ b/src/test/ssl/t/002_scram.pl
@@ -11,11 +11,11 @@ use File::Copy;
 use FindBin;
 use lib $FindBin::RealBin;
 
-use SSLServer;
+use SSL::Server;
 
-if ($ENV{with_openssl} ne 'yes')
+if ($ENV{with_ssl} ne 'openssl')
 {
-	plan skip_all => 'SSL not supported by this build';
+	plan skip_all => 'OpenSSL not supported by this build';
 }
 
 # This is the hostname used to connect to the server.
diff --git a/src/test/ssl/t/SSL/Backend/NSS.pm b/src/test/ssl/t/SSL/Backend/NSS.pm
new file mode 100644
index 0000000000..837f0d9891
--- /dev/null
+++ b/src/test/ssl/t/SSL/Backend/NSS.pm
@@ -0,0 +1,64 @@
+package SSL::Backend::NSS;
+
+use strict;
+use warnings;
+use Exporter;
+
+our @ISA       = qw(Exporter);
+our @EXPORT_OK = qw(get_new_nss_backend);
+
+sub new
+{
+	my ($class) = @_;
+
+	my $self = { _library => 'NSS' };
+
+	bless $self, $class;
+
+	return $self;
+}
+
+sub get_new_nss_backend
+{
+	my $class = 'SSL::Backend::NSS';
+
+	return $class->new();
+}
+
+sub init
+{
+	# Make sure the certificate databases are in place?
+}
+
+sub get_library
+{
+	my ($self) = @_;
+
+	return $self->{_library};
+}
+
+sub set_server_cert
+{
+	my $self     = $_[0];
+	my $certfile = $_[1];
+	my $cafile   = $_[2];
+	my $keyfile  = $_[3];
+
+	my $cert_nickname = $certfile . '.crt__' . $keyfile . '.key';
+	my $cert_database = $cert_nickname . '.db';
+
+	my $sslconf =
+	    "ssl_ca_file='$cafile.crt'\n"
+	  . "ssl_cert_file='ssl/$certfile.crt'\n"
+	  . "ssl_crl_file=''\n"
+	  . "ssl_database='nss/$cert_database'\n";
+
+	return $sslconf;
+}
+
+sub cleanup
+{
+	# Something?
+}
+
+1;
diff --git a/src/test/ssl/t/SSL/Backend/OpenSSL.pm b/src/test/ssl/t/SSL/Backend/OpenSSL.pm
new file mode 100644
index 0000000000..62b11b7632
--- /dev/null
+++ b/src/test/ssl/t/SSL/Backend/OpenSSL.pm
@@ -0,0 +1,103 @@
+package SSL::Backend::OpenSSL;
+
+use strict;
+use warnings;
+use Exporter;
+use File::Copy;
+
+our @ISA       = qw(Exporter);
+our @EXPORT_OK = qw(get_new_openssl_backend);
+
+our (@keys);
+
+INIT
+{
+	@keys = (
+		"client",     "client-revoked",
+		"client-der", "client-encrypted-pem",
+		"client-encrypted-der");
+}
+
+sub new
+{
+	my ($class) = @_;
+
+	my $self = { _library => 'OpenSSL' };
+
+	bless $self, $class;
+
+	return $self;
+}
+
+sub get_new_openssl_backend
+{
+	my $class = 'SSL::Backend::OpenSSL';
+
+	my $backend = $class->new();
+
+	return $backend;
+}
+
+sub init
+{
+	# The client's private key must not be world-readable, so take a copy
+	# of the key stored in the code tree and update its permissions.
+	#
+	# This changes ssl/client.key to ssl/client_tmp.key etc for the rest
+	# of the tests.
+	foreach my $key (@keys)
+	{
+		copy("ssl/${key}.key", "ssl/${key}_tmp.key")
+		  or die
+		  "couldn't copy ssl/${key}.key to ssl/${key}_tmp.key for permissions change: $!";
+		chmod 0600, "ssl/${key}_tmp.key"
+		  or die "failed to change permissions on ssl/${key}_tmp.key: $!";
+	}
+
+	# Also make a copy of that explicitly world-readable.  We can't
+	# necessarily rely on the file in the source tree having those
+	# permissions. Add it to @keys to include it in the final clean
+	# up phase.
+	copy("ssl/client.key", "ssl/client_wrongperms_tmp.key")
+	  or die
+	  "couldn't copy ssl/client.key to ssl/client_wrongperms_tmp.key: $!";
+	chmod 0644, "ssl/client_wrongperms_tmp.key"
+	  or die
+	  "failed to change permissions on ssl/client_wrongperms_tmp.key: $!";
+	push @keys, 'client_wrongperms';
+}
+
+# Change the configuration to use given server cert file, and reload
+# the server so that the configuration takes effect.
+sub set_server_cert
+{
+	my $self     = $_[0];
+	my $certfile = $_[1];
+	my $cafile   = $_[2] || "root+client_ca";
+	my $keyfile  = $_[3] || $certfile;
+
+	my $sslconf =
+	    "ssl_ca_file='$cafile.crt'\n"
+	  . "ssl_cert_file='$certfile.crt'\n"
+	  . "ssl_key_file='$keyfile.key'\n"
+	  . "ssl_crl_file='root+client.crl'\n";
+
+	return $sslconf;
+}
+
+sub get_library
+{
+	my ($self) = @_;
+
+	return $self->{_library};
+}
+
+sub cleanup
+{
+	foreach my $key (@keys)
+	{
+		unlink("ssl/${key}_tmp.key");
+	}
+}
+
+1;
diff --git a/src/test/ssl/t/SSLServer.pm b/src/test/ssl/t/SSL/Server.pm
similarity index 78%
rename from src/test/ssl/t/SSLServer.pm
rename to src/test/ssl/t/SSL/Server.pm
index f5987a003e..ee901855b5 100644
--- a/src/test/ssl/t/SSLServer.pm
+++ b/src/test/ssl/t/SSL/Server.pm
@@ -23,19 +23,39 @@
 # explicitly because an invalid sslcert or sslrootcert, respectively,
 # causes those to be ignored.)
 
-package SSLServer;
+package SSL::Server;
 
 use strict;
 use warnings;
 use PostgresNode;
+use RecursiveCopy;
 use TestLib;
 use File::Basename;
 use File::Copy;
 use Test::More;
+use SSL::Backend::OpenSSL qw(get_new_openssl_backend);
+use SSL::Backend::NSS qw(get_new_nss_backend);
+
+our ($openssl, $nss, $backend);
+
+# The TLS backend which the server is using should be mostly transparent for
+# the user, apart from individual configuration settings, so keep the backend
+# specific things abstracted behind SSL::Server.
+if ($ENV{with_ssl} eq 'openssl')
+{
+	$backend = get_new_openssl_backend();
+	$openssl = 1;
+}
+elsif ($ENV{with_ssl} eq 'nss')
+{
+	$backend = get_new_nss_backend();
+	$nss     = 1;
+}
 
 use Exporter 'import';
 our @EXPORT = qw(
   configure_test_server_for_ssl
+  set_server_cert
   switch_server_cert
   test_connect_fails
   test_connect_ok
@@ -144,12 +164,19 @@ sub configure_test_server_for_ssl
 	close $sslconf;
 
 	# Copy all server certificates and keys, and client root cert, to the data dir
-	copy_files("ssl/server-*.crt", $pgdata);
-	copy_files("ssl/server-*.key", $pgdata);
-	chmod(0600, glob "$pgdata/server-*.key") or die $!;
-	copy_files("ssl/root+client_ca.crt", $pgdata);
-	copy_files("ssl/root_ca.crt",        $pgdata);
-	copy_files("ssl/root+client.crl",    $pgdata);
+	if (defined($openssl))
+	{
+		copy_files("ssl/server-*.crt", $pgdata);
+		copy_files("ssl/server-*.key", $pgdata);
+		chmod(0600, glob "$pgdata/server-*.key") or die $!;
+		copy_files("ssl/root+client_ca.crt", $pgdata);
+		copy_files("ssl/root_ca.crt",        $pgdata);
+		copy_files("ssl/root+client.crl",    $pgdata);
+	}
+	elsif (defined($nss))
+	{
+		RecursiveCopy::copypath("ssl/nss", $pgdata . "/nss") if -e "ssl/nss";
+	}
 
 	# Stop and restart server to load new listen_addresses.
 	$node->restart;
@@ -157,26 +184,51 @@ sub configure_test_server_for_ssl
 	# Change pg_hba after restart because hostssl requires ssl=on
 	configure_hba_for_ssl($node, $servercidr, $authmethod);
 
+	# Finally, perform backend specific configuration
+	$backend->init();
+
 	return;
 }
 
-# Change the configuration to use given server cert file, and reload
-# the server so that the configuration takes effect.
-sub switch_server_cert
+sub ssl_library
+{
+	return $backend->get_library();
+}
+
+sub cleanup
+{
+	$backend->cleanup();
+}
+
+# Change the configuration to use given server cert file,
+sub set_server_cert
 {
 	my $node     = $_[0];
 	my $certfile = $_[1];
 	my $cafile   = $_[2] || "root+client_ca";
+	my $keyfile  = $_[3] || '';
+	my $pwcmd    = $_[4] || '';
 	my $pgdata   = $node->data_dir;
 
+	$keyfile = $certfile if $keyfile eq '';
+
 	open my $sslconf, '>', "$pgdata/sslconfig.conf";
 	print $sslconf "ssl=on\n";
-	print $sslconf "ssl_ca_file='$cafile.crt'\n";
-	print $sslconf "ssl_cert_file='$certfile.crt'\n";
-	print $sslconf "ssl_key_file='$certfile.key'\n";
-	print $sslconf "ssl_crl_file='root+client.crl'\n";
+	print $sslconf $backend->set_server_cert($certfile, $cafile, $keyfile);
+	print $sslconf "ssl_passphrase_command='$pwcmd'\n"
+	  unless $pwcmd eq '';
 	close $sslconf;
+	return;
+}
 
+# Change the configuration to use given server cert file, and reload
+# the server so that the configuration takes effect.
+# Takes the same arguments as set_server_cert, which it calls to do that
+# piece of the work.
+sub switch_server_cert
+{
+	my $node = $_[0];
+	set_server_cert(@_);
 	$node->restart;
 	return;
 }
-- 
2.21.1 (Apple Git-122.3)

From d9a150702d9441e043ede97445713efc5401257f Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Wed, 28 Oct 2020 11:24:02 +0100
Subject: [PATCH v15 3/6] NSS pg_strong_random support

---
 configure                   |  8 +++++++-
 configure.ac                |  5 ++++-
 src/include/pg_config.h.in  |  3 +++
 src/port/pg_strong_random.c | 37 +++++++++++++++++++++++++++++++++++++
 4 files changed, 51 insertions(+), 2 deletions(-)

diff --git a/configure b/configure
index 6287a0e2fe..f78772bd42 100755
--- a/configure
+++ b/configure
@@ -18426,6 +18426,12 @@ $as_echo "#define USE_WIN32_RANDOM 1" >>confdefs.h
 
   { $as_echo "$as_me:${as_lineno-$LINENO}: result: Windows native" >&5
 $as_echo "Windows native" >&6; }
+elif test x"$USE_NSS_RANDOM" = x"1" ; then
+
+$as_echo "#define USE_NSS_RANDOM 1" >>confdefs.h
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: NSS" >&5
+$as_echo "NSS" >&6; }
 elif test x"$USE_DEV_URANDOM" = x"1" ; then
 
 $as_echo "#define USE_DEV_URANDOM 1" >>confdefs.h
@@ -18435,7 +18441,7 @@ $as_echo "/dev/urandom" >&6; }
 else
   as_fn_error $? "
 no source of strong random numbers was found
-PostgreSQL can use OpenSSL or /dev/urandom as a source of random numbers." "$LINENO" 5
+PostgreSQL can use OpenSSL, NSS, Windows native RNG or /dev/urandom as a source of random numbers." "$LINENO" 5
 fi
 
 # If not set in template file, set bytes to use libc memset()
diff --git a/configure.ac b/configure.ac
index 706c9862e7..01c23356ab 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2215,13 +2215,16 @@ if test x"$USE_OPENSSL_RANDOM" = x"1" ; then
 elif test x"$USE_WIN32_RANDOM" = x"1" ; then
   AC_DEFINE(USE_WIN32_RANDOM, 1, [Define to use native Windows API for random number generation])
   AC_MSG_RESULT([Windows native])
+elif test x"$USE_NSS_RANDOM" = x"1" ; then
+  AC_DEFINE(USE_NSS_RANDOM, 1, [Define to use NSS for random number generation])
+  AC_MSG_RESULT([NSS])
 elif test x"$USE_DEV_URANDOM" = x"1" ; then
   AC_DEFINE(USE_DEV_URANDOM, 1, [Define to use /dev/urandom for random number generation])
   AC_MSG_RESULT([/dev/urandom])
 else
   AC_MSG_ERROR([
 no source of strong random numbers was found
-PostgreSQL can use OpenSSL or /dev/urandom as a source of random numbers.])
+PostgreSQL can use OpenSSL, NSS, Windows native RNG or /dev/urandom as a source of random numbers.])
 fi
 
 # If not set in template file, set bytes to use libc memset()
diff --git a/src/include/pg_config.h.in b/src/include/pg_config.h.in
index 31f808398c..73c39b449c 100644
--- a/src/include/pg_config.h.in
+++ b/src/include/pg_config.h.in
@@ -896,6 +896,9 @@
 /* Define to build with NSS support (--with-nss) */
 #undef USE_NSS
 
+/* Define to use NSS for random number generation */
+#undef USE_NSS_RANDOM
+
 /* Define to 1 to use software CRC-32C implementation (slicing-by-8). */
 #undef USE_SLICING_BY_8_CRC32C
 
diff --git a/src/port/pg_strong_random.c b/src/port/pg_strong_random.c
index 14e8382cd8..33af92a60b 100644
--- a/src/port/pg_strong_random.c
+++ b/src/port/pg_strong_random.c
@@ -30,6 +30,20 @@
 #ifdef USE_WIN32_RANDOM
 #include <wincrypt.h>
 #endif
+#ifdef USE_NSS_RANDOM
+#define pg_BITS_PER_BYTE BITS_PER_BYTE
+#undef BITS_PER_BYTE
+#include <nss/nss.h>
+#include <nss/pk11pub.h>
+#if defined(BITS_PER_BYTE)
+#if BITS_PER_BYTE != pg_BITS_PER_BYTE
+#error "incompatible byte widths between NSPR and postgres"
+#endif
+#else
+#define BITS_PER_BYTE pg_BITS_PER_BYTE
+#endif
+#undef pg_BITS_PER_BYTE
+#endif
 
 #ifdef USE_WIN32_RANDOM
 /*
@@ -158,6 +172,29 @@ pg_strong_random(void *buf, size_t len)
 	}
 	return false;
 
+#elif defined(USE_NSS_RANDOM)
+	NSSInitParameters params;
+	NSSInitContext *nss_context;
+	SECStatus status;
+
+	memset(&params, 0, sizeof(params));
+	params.length = sizeof(params);
+	nss_context = NSS_InitContext("", "", "", "", &params,
+							  NSS_INIT_READONLY | NSS_INIT_NOCERTDB |
+							  NSS_INIT_NOMODDB | NSS_INIT_FORCEOPEN |
+							  NSS_INIT_NOROOTINIT | NSS_INIT_PK11RELOAD);
+
+	if (!nss_context)
+		return false;
+
+	status = PK11_GenerateRandom(buf, len);
+	NSS_ShutdownContext(nss_context);
+
+	if (status == SECSuccess)
+		return true;
+
+	return false;
+
 	/*
 	 * Read /dev/urandom ourselves.
 	 */
-- 
2.21.1 (Apple Git-122.3)

From 8f5cf6930875caa48f70c3982b9d176beb2f6e86 Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Wed, 28 Oct 2020 11:26:31 +0100
Subject: [PATCH v15 4/6] NSS Documentation

---
 doc/src/sgml/acronyms.sgml     | 43 +++++++++++++++++++
 doc/src/sgml/config.sgml       | 28 ++++++++++--
 doc/src/sgml/installation.sgml | 30 ++++++++++++-
 doc/src/sgml/libpq.sgml        | 27 ++++++++++--
 doc/src/sgml/runtime.sgml      | 78 ++++++++++++++++++++++++++++++++--
 5 files changed, 195 insertions(+), 11 deletions(-)

diff --git a/doc/src/sgml/acronyms.sgml b/doc/src/sgml/acronyms.sgml
index 4e5ec983c0..4f6f0cf353 100644
--- a/doc/src/sgml/acronyms.sgml
+++ b/doc/src/sgml/acronyms.sgml
@@ -441,6 +441,28 @@
     </listitem>
    </varlistentry>
 
+   <varlistentry>
+    <term><acronym>NSPR</acronym></term>
+    <listitem>
+     <para>
+      <ulink
+      url="https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSPR">
+      Netscape Portable Runtime</ulink>
+     </para>
+    </listitem>
+   </varlistentry>
+
+   <varlistentry>
+    <term><acronym>NSS</acronym></term>
+    <listitem>
+     <para>
+      <ulink
+      url="https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS">
+      Network Security Services</ulink>
+     </para>
+    </listitem>
+   </varlistentry>
+
    <varlistentry>
     <term><acronym>ODBC</acronym></term>
     <listitem>
@@ -539,6 +561,17 @@
     </listitem>
    </varlistentry>
 
+   <varlistentry>
+    <term><acronym>PKCS#12</acronym></term>
+    <listitem>
+     <para>
+      <ulink
+      url="https://en.wikipedia.org/wiki/PKCS_12">
+      Public-Key Cryptography Standards #12</ulink>
+     </para>
+    </listitem>
+   </varlistentry>
+
    <varlistentry>
     <term><acronym>PL</acronym></term>
     <listitem>
@@ -684,6 +717,16 @@
     </listitem>
    </varlistentry>
 
+   <varlistentry>
+    <term><acronym>TLS</acronym></term>
+    <listitem>
+     <para>
+      <ulink url="https://sv.wikipedia.org/wiki/Transport_Layer_Security">
+      Transport Layer Security</ulink>
+     </para>
+    </listitem>
+   </varlistentry>
+
    <varlistentry>
     <term><acronym>TOAST</acronym></term>
     <listitem>
diff --git a/doc/src/sgml/config.sgml b/doc/src/sgml/config.sgml
index f043433e31..f7ae3b1be1 100644
--- a/doc/src/sgml/config.sgml
+++ b/doc/src/sgml/config.sgml
@@ -1208,6 +1208,23 @@ include_dir 'conf.d'
       </listitem>
      </varlistentry>
 
+     <varlistentry id="guc-ssl-database" xreflabel="ssl_database">
+      <term><varname>ssl_database</varname> (<type>string</type>)
+      <indexterm>
+       <primary><varname>ssl_database</varname> configuration parameter</primary>
+      </indexterm>
+      </term>
+      <listitem>
+       <para>
+        Specifies the name of the file containing the server certificates and
+        keys when using <productname>NSS</productname> for <acronym>SSL</acronym>
+        connections. This parameter can only be set in the
+        <filename>postgresql.conf</filename> file or on the server command
+        line.
+       </para>
+      </listitem>
+     </varlistentry>
+
      <varlistentry id="guc-ssl-ciphers" xreflabel="ssl_ciphers">
       <term><varname>ssl_ciphers</varname> (<type>string</type>)
       <indexterm>
@@ -1224,7 +1241,9 @@ include_dir 'conf.d'
         connections using TLS version 1.2 and lower are affected.  There is
         currently no setting that controls the cipher choices used by TLS
         version 1.3 connections.  The default value is
-        <literal>HIGH:MEDIUM:+3DES:!aNULL</literal>.  The default is usually a
+        <literal>HIGH:MEDIUM:+3DES:!aNULL</literal> for servers which have
+        been built with <productname>OpenSSL</productname> as the
+        <acronym>SSL</acronym> library.  The default is usually a
         reasonable choice unless you have specific security requirements.
        </para>
 
@@ -1426,8 +1445,11 @@ include_dir 'conf.d'
        <para>
         Sets an external command to be invoked when a passphrase for
         decrypting an SSL file such as a private key needs to be obtained.  By
-        default, this parameter is empty, which means the built-in prompting
-        mechanism is used.
+        default, this parameter is empty. When the server is using
+        <productname>OpenSSL</productname>, this means the built-in prompting
+        mechanism is used. When using <productname>NSS</productname>, there is
+        no default prompting so a blank callback will be used returning an
+        empty password.
        </para>
        <para>
         The command must print the passphrase to the standard output and exit
diff --git a/doc/src/sgml/installation.sgml b/doc/src/sgml/installation.sgml
index 0ac1cb9999..bd09124fb0 100644
--- a/doc/src/sgml/installation.sgml
+++ b/doc/src/sgml/installation.sgml
@@ -250,7 +250,7 @@ su - postgres
 
     <listitem>
      <para>
-      You need <productname>OpenSSL</productname>, if you want to support
+      You need a supported <acronym>SSL</acronym> library, if you want to support
       encrypted client connections.  <productname>OpenSSL</productname> is
       also required for random number generation on platforms that do not
       have <filename>/dev/urandom</filename> (except Windows).  The minimum
@@ -966,6 +966,31 @@ build-postgresql:
        </listitem>
       </varlistentry>
 
+      <varlistentry>
+       <term><option>--with-nss</option>
+       <indexterm>
+        <primary>NSS</primary>
+        <secondary>NSPR</secondary>
+        <seealso>SSL</seealso>
+       </indexterm>
+       </term>
+       <listitem>
+        <para>
+         Build with support for <acronym>SSL</acronym> (encrypted)
+         connections using <productname>NSS</productname>. This requires the
+         <productname>NSS</productname> package to be installed. Additionally,
+         <productname>NSS</productname> requires <productname>NSPR</productname>
+         to be installed. <filename>configure</filename> will check for the
+         required header files and libraries to make sure that your
+         <productname>NSS</productname> installation is sufficient before
+         proceeding.
+        </para>
+        <para>
+         This option is incompatible with <literal>--with-openssl</literal>.
+        </para>
+       </listitem>
+      </varlistentry>
+
       <varlistentry>
        <term><option>--with-openssl</option>
        <indexterm>
@@ -982,6 +1007,9 @@ build-postgresql:
          your <productname>OpenSSL</productname> installation is sufficient
          before proceeding.
         </para>
+        <para>
+         This option is incompatible with <literal>--with-nss</literal>.
+        </para>
        </listitem>
       </varlistentry>
 
diff --git a/doc/src/sgml/libpq.sgml b/doc/src/sgml/libpq.sgml
index 9ce32fb39b..61d9082052 100644
--- a/doc/src/sgml/libpq.sgml
+++ b/doc/src/sgml/libpq.sgml
@@ -2459,6 +2459,8 @@ void *PQsslStruct(const PGconn *conn, const char *struct_name);
       </para>
       <para>
        The struct(s) available depend on the SSL implementation in use.
+      </para>
+      <para>
        For <productname>OpenSSL</productname>, there is one struct,
        available under the name "OpenSSL", and it returns a pointer to the
        <productname>OpenSSL</productname> <literal>SSL</literal> struct.
@@ -2482,9 +2484,14 @@ void *PQsslStruct(const PGconn *conn, const char *struct_name);
 ]]></programlisting>
       </para>
       <para>
-       This structure can be used to verify encryption levels, check server
-       certificates, and more. Refer to the <productname>OpenSSL</productname>
-       documentation for information about this structure.
+       For <productname>NSS</productname>, there is one struct available under
+       the name "NSS", and it returns a pointer to the
+       <productname>NSS</productname> <literal>PRFileDesc</literal>.
+      </para>
+      <para>
+       These structures can be used to verify encryption levels, check server
+       certificates, and more. Refer to the <acronym>SSL</acronym> library
+       documentation for information about these structures.
       </para>
      </listitem>
     </varlistentry>
@@ -2511,6 +2518,10 @@ void *PQgetssl(const PGconn *conn);
        <xref linkend="libpq-PQsslInUse"/> instead, and for more details about the
        connection, use <xref linkend="libpq-PQsslAttribute"/>.
       </para>
+      <para>
+       This function returns <literal>NULL</literal> when <acronym>SSL</acronym>
+       librariaes other than <productname>OpenSSL</productname> are used.
+      </para>
      </listitem>
     </varlistentry>
 
@@ -7943,6 +7954,11 @@ void PQinitOpenSSL(int do_ssl, int do_crypto);
        before first opening a database connection.  Also be sure that you
        have done that initialization before opening a database connection.
       </para>
+
+      <para>
+       This function does nothing when using <productname>NSS</productname> as
+       the <acronym>SSL</acronym> library.
+      </para>
      </listitem>
     </varlistentry>
 
@@ -7969,6 +7985,11 @@ void PQinitSSL(int do_ssl);
        might be preferable for applications that need to work with older
        versions of <application>libpq</application>.
       </para>
+
+      <para>
+       This function does nothing when using <productname>NSS</productname> as
+       the <acronym>SSL</acronym> library.
+      </para>
      </listitem>
     </varlistentry>
    </variablelist>
diff --git a/doc/src/sgml/runtime.sgml b/doc/src/sgml/runtime.sgml
index 17e938148c..fe7e305b75 100644
--- a/doc/src/sgml/runtime.sgml
+++ b/doc/src/sgml/runtime.sgml
@@ -2183,15 +2183,21 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
 
   <indexterm zone="ssl-tcp">
    <primary>SSL</primary>
+   <secondary>TLS</secondary>
   </indexterm>
 
   <para>
    <productname>PostgreSQL</productname> has native support for using
    <acronym>SSL</acronym> connections to encrypt client/server communications
    for increased security. This requires that
-   <productname>OpenSSL</productname> is installed on both client and
+   a supported TLS library is installed on both client and
    server systems and that support in <productname>PostgreSQL</productname> is
    enabled at build time (see <xref linkend="installation"/>).
+   Supported libraries are <productname>OpenSSL</productname> and
+   <productname>NSS</productname>. The terms <acronym>SSL</acronym> and
+   <acronym>TLS</acronym> are often used interchangeably to mean a secure
+   connection using a <acronym>TLS</acronym> protocol, even though
+   <acronym>SSL</acronym> protocols are no longer supported.
   </para>
 
   <sect2 id="ssl-setup">
@@ -2211,8 +2217,13 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
   </para>
 
   <para>
-   To start in <acronym>SSL</acronym> mode, files containing the server certificate
-   and private key must exist.  By default, these files are expected to be
+   To start in <acronym>SSL</acronym> mode, a server certificate
+   and private key must exist. The below sections on the different libraries
+   will discuss how to configure these.
+  </para>
+   
+  <para>
+   By default, these files are expected to be
    named <filename>server.crt</filename> and <filename>server.key</filename>, respectively, in
    the server's data directory, but other names and locations can be specified
    using the configuration parameters <xref linkend="guc-ssl-cert-file"/>
@@ -2302,6 +2313,18 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
   </note>
   </sect2>
 
+  <sect2 id="ssl-nss-config">
+   <title>NSS Configuration</title>
+
+  <para>
+   <productname>PostgreSQL</productname> will look for certificates and keys
+   in the <productname>NSS</productname> database specified by the parameter
+   <xref linkend="guc-ssl-database"/> in <filename>postgresql.conf</filename>.
+   The paramaters for certificate and key filenames are used to identify the
+   nicknames in the database.
+  </para>
+  </sect2>
+
   <sect2 id="ssl-client-certificates">
    <title>Using Client Certificates</title>
 
@@ -2376,7 +2399,7 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
   </sect2>
 
   <sect2 id="ssl-server-files">
-   <title>SSL Server File Usage</title>
+   <title>SSL Server File Parameter Usage</title>
 
    <para>
     <xref linkend="ssl-file-usage"/> summarizes the files that are
@@ -2423,6 +2446,14 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
       <entry>client certificate must not be on this list</entry>
      </row>
 
+     <row>
+      <entry><xref linkend="guc-ssl-database"/></entry>
+      <entry>certificate database</entry>
+      <entry>contains server certificates, keys and revocation lists; only
+      used when <productname>PostgreSQL</productname> is built with support
+      for <productname>NSS</productname>.</entry>
+     </row>
+
     </tbody>
    </tgroup>
   </table>
@@ -2550,6 +2581,45 @@ openssl x509 -req -in server.csr -text -days 365 \
    </para>
   </sect2>
 
+  <sect2 id="nss-certificate-database">
+   <title>NSS Certificate Databases</title>
+
+   <para>
+    When using <productname>NSS</productname>, all certificates and keys must
+    be loaded into an <productname>NSS</productname> certificate database.
+   </para>
+
+   <para>
+    To create a new <productname>NSS</productname> certificate database and
+    load the certificates created in <xref linkend="ssl-certificate-creation" />,
+    use the following <productname>NSS</productname> commands:
+<programlisting>
+certutil -d "sql:server.db" -N --empty-password
+certutil -d "sql:server.db" -A -n server.crt -i server.crt -t "CT,C,C"
+certutil -d "sql:server.db" -A -n root.crt -i root.crt -t "CT,C,C"
+</programlisting>
+    This will give the certificate the filename as the nickname identifier in
+    the database which is created as <filename>server.db</filename>.
+   </para>
+   <para>
+    Then load the server key, which require converting it to
+    <acronym>PKCS#12</acronym> format using the
+    <productname>OpenSSL</productname> tools:
+<programlisting>
+openssl pkcs12 -export -out server.pfx -inkey server.key -in server.crt \
+  -certfile root.crt -passout pass:
+pk12util -i server.pfx -d server.db -W ''
+</programlisting>
+   </para>
+   <para>
+    Finally a certificate revocation list can be loaded with the following
+    commands:
+<programlisting>
+crlutil -I -i server.crl -d server.db -B
+</programlisting>
+   </para>
+  </sect2>
+
  </sect1>
 
  <sect1 id="gssapi-enc">
-- 
2.21.1 (Apple Git-122.3)

From 752805f50dd7c63b8784cd15336ad3056d98adf9 Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Wed, 28 Oct 2020 11:34:37 +0100
Subject: [PATCH v15 5/6] NSS contrib modules

---
 contrib/Makefile            |   2 +-
 contrib/pgcrypto/Makefile   |   7 +-
 contrib/pgcrypto/nss.c      | 773 ++++++++++++++++++++++++++++++++++++
 contrib/pgcrypto/px.c       |   1 +
 contrib/pgcrypto/px.h       |   1 +
 contrib/sslinfo/sslinfo.c   | 164 ++++----
 doc/src/sgml/pgcrypto.sgml  |  38 +-
 doc/src/sgml/sslinfo.sgml   |  12 +-
 src/tools/msvc/Install.pm   |   3 +-
 src/tools/msvc/Mkvcbuild.pm |  12 +-
 10 files changed, 910 insertions(+), 103 deletions(-)
 create mode 100644 contrib/pgcrypto/nss.c

diff --git a/contrib/Makefile b/contrib/Makefile
index 7a4866e338..c2232e5a4d 100644
--- a/contrib/Makefile
+++ b/contrib/Makefile
@@ -52,7 +52,7 @@ SUBDIRS = \
 		unaccent	\
 		vacuumlo
 
-ifeq ($(with_openssl),yes)
+ifneq ($(with_ssl),no)
 SUBDIRS += sslinfo
 else
 ALWAYS_SUBDIRS += sslinfo
diff --git a/contrib/pgcrypto/Makefile b/contrib/pgcrypto/Makefile
index 61eabd2fc0..28b54d321b 100644
--- a/contrib/pgcrypto/Makefile
+++ b/contrib/pgcrypto/Makefile
@@ -7,11 +7,14 @@ INT_TESTS = sha2
 OSSL_SRCS = openssl.c pgp-mpi-openssl.c
 OSSL_TESTS = sha2 des 3des cast5
 
+NSS_SRCS = nss.c pgp-mpi-internal.c imath.c blf.c
+NSS_TESTS = sha2 des 3des
+
 ZLIB_TST = pgp-compression
 ZLIB_OFF_TST = pgp-zlib-DISABLED
 
-CF_SRCS = $(if $(subst no,,$(with_openssl)), $(OSSL_SRCS), $(INT_SRCS))
-CF_TESTS = $(if $(subst no,,$(with_openssl)), $(OSSL_TESTS), $(INT_TESTS))
+CF_SRCS = $(if $(findstring openssl, $(with_ssl)), $(OSSL_SRCS), $(if $(findstring nss, $(with_ssl)), $(NSS_SRCS), $(INT_SRCS)))
+CF_TESTS = $(if $(findstring openssl, $(with_ssl)), $(OSSL_TESTS), $(if $(findstring nss, $(with_ssl)), $(NSS_TESTS), $(INT_TESTS)))
 CF_PGP_TESTS = $(if $(subst no,,$(with_zlib)), $(ZLIB_TST), $(ZLIB_OFF_TST))
 
 SRCS = \
diff --git a/contrib/pgcrypto/nss.c b/contrib/pgcrypto/nss.c
new file mode 100644
index 0000000000..e1291ed403
--- /dev/null
+++ b/contrib/pgcrypto/nss.c
@@ -0,0 +1,773 @@
+/*-------------------------------------------------------------------------
+ *
+ * nss.c
+ *	  Wrapper for using NSS as a backend for pgcrypto PX
+ *
+ *
+ * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ *	  contrib/pgcrypto/nss.c
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#include "postgres.h"
+
+#include "px.h"
+#include "blf.h"
+#include "utils/memutils.h"
+
+/*
+ * BITS_PER_BYTE is also defined in the NSPR header files, so we need to undef
+ * our version to avoid compiler warnings on redefinition.
+ */
+#define pg_BITS_PER_BYTE BITS_PER_BYTE
+#undef BITS_PER_BYTE
+
+#include <nss/nss.h>
+#include <nss/hasht.h>
+#include <nss/pk11func.h>
+#include <nss/pk11pub.h>
+#include <nss/secitem.h>
+#include <nss/sechash.h>
+#include <nss/secoid.h>
+#include <nss/secerr.h>
+
+/*
+ * Ensure that the colliding definitions match, else throw an error. In case
+ * NSPR has removed the definition for some reason, make sure to put ours
+ * back again.
+ */
+#if defined(BITS_PER_BYTE)
+#if BITS_PER_BYTE != pg_BITS_PER_BYTE
+#error "incompatible byte widths between NSPR and postgres"
+#endif
+#else
+#define BITS_PER_BYTE pg_BITS_PER_BYTE
+#endif
+#undef pg_BITS_PER_BYTE
+
+/*
+ * Define our own mechanisms for Blowfish as it's not implemented by NSS.
+ */
+#define BLOWFISH_CBC	(1)
+#define BLOWFISH_ECB	(2)
+
+/*
+ * Data structures for recording cipher implementations as well as ongoing
+ * cipher operations.
+ */
+typedef struct nss_digest
+{
+	NSSInitContext *context;
+	PK11Context *hash_context;
+	HASH_HashType hash_type;
+}			nss_digest;
+
+typedef struct cipher_implementation
+{
+	/* Function pointers to cipher operations */
+	int			(*init) (PX_Cipher *pxc, const uint8 *key, unsigned klen, const uint8 *iv);
+	unsigned	(*get_block_size) (PX_Cipher *pxc);
+	unsigned 	(*get_key_size) (PX_Cipher *pxc);
+	unsigned 	(*get_iv_size) (PX_Cipher *pxc);
+	int			(*encrypt) (PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res);
+	int			(*decrypt) (PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res);
+	void		(*free) (PX_Cipher *pxc);
+
+	/* The mechanism describing the cipher used */
+	union
+	{
+		CK_MECHANISM_TYPE nss;
+		CK_ULONG internal;
+	}			mechanism;
+	int			keylen;
+	bool		is_nss;
+}			cipher_implementation;
+
+typedef struct nss_cipher
+{
+	const cipher_implementation *impl;
+	NSSInitContext *context;
+	PK11Context *crypt_context;
+	SECItem *params;
+
+	PK11SymKey *encrypt_key;
+	PK11SymKey *decrypt_key;
+}			nss_cipher;
+
+typedef struct internal_cipher
+{
+	const cipher_implementation *impl;
+	BlowfishContext	context;
+}			internal_cipher;
+
+typedef struct nss_cipher_ref
+{
+	const char *name;
+	const cipher_implementation *impl;
+} nss_cipher_ref;
+
+/*
+ * Prototypes
+ */
+static unsigned nss_get_iv_size(PX_Cipher *pxc);
+static unsigned nss_get_block_size(PX_Cipher *pxc);
+
+/*
+ * nss_GetHashOidTagByHashType
+ *
+ * Returns the corresponding SECOidTag for the passed hash type. NSS 3.43
+ * includes HASH_GetHashOidTagByHashType for this purpose, but at the time of
+ * writing is not commonly available so we need our own version till then.
+ */
+static SECOidTag
+nss_GetHashOidTagByHashType(HASH_HashType type)
+{
+	if (type == HASH_AlgMD2)
+		return SEC_OID_MD2;
+	if (type == HASH_AlgMD5)
+		return SEC_OID_MD5;
+	if (type == HASH_AlgSHA1)
+		return SEC_OID_SHA1;
+	if (type == HASH_AlgSHA224)
+		return SEC_OID_SHA224;
+	if (type == HASH_AlgSHA256)
+		return SEC_OID_SHA256;
+	if (type == HASH_AlgSHA384)
+		return SEC_OID_SHA384;
+	if (type == HASH_AlgSHA512)
+		return SEC_OID_SHA512;
+
+	return SEC_OID_UNKNOWN;
+}
+
+static unsigned
+nss_digest_block_size(PX_MD *pxmd)
+{
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+	const SECHashObject *object;
+
+	object = HASH_GetHashObject(digest->hash_type);
+	return object->blocklength;
+}
+
+static unsigned
+nss_digest_result_size(PX_MD *pxmd)
+{
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+	const SECHashObject *object;
+
+	object = HASH_GetHashObject(digest->hash_type);
+	return object->length;
+}
+
+static void
+nss_digest_free(PX_MD *pxmd)
+{
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+	PRBool	free_ctx = PR_TRUE;
+
+	PK11_DestroyContext(digest->hash_context, free_ctx);
+	NSS_ShutdownContext(digest->context);
+}
+
+static void
+nss_digest_update(PX_MD *pxmd, const uint8 *data, unsigned dlen)
+{
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+
+	PK11_DigestOp(digest->hash_context, data, dlen);
+}
+
+static void
+nss_digest_reset(PX_MD *pxmd)
+{
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+
+	PK11_DigestBegin(digest->hash_context);
+}
+
+static void
+nss_digest_finish(PX_MD *pxmd, uint8 *dst)
+{
+	unsigned int outlen;
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+	const SECHashObject *object;
+
+	object = HASH_GetHashObject(digest->hash_type);
+	PK11_DigestFinal(digest->hash_context, dst, &outlen, object->length);
+}
+
+int
+px_find_digest(const char *name, PX_MD **res)
+{
+	PX_MD	*pxmd;
+	NSSInitParameters params;
+	NSSInitContext *nss_context;
+	bool found = false;
+	nss_digest *digest;
+	SECStatus status;
+	SECOidData *hash;
+	HASH_HashType t;
+
+	/*
+	 * Initialize our own NSS context without a database backing it.
+	 */
+	memset(&params, 0, sizeof(params));
+	params.length = sizeof(params);
+	nss_context = NSS_InitContext("", "", "", "", &params,
+								  NSS_INIT_READONLY | NSS_INIT_NOCERTDB |
+								  NSS_INIT_NOMODDB | NSS_INIT_FORCEOPEN |
+								  NSS_INIT_NOROOTINIT | NSS_INIT_PK11RELOAD);
+
+	/*
+	 * There is no API function for looking up a digest algorithm from a name
+	 * string, but there is a publically accessible array which can be scanned
+	 * for the name.
+	 */
+	for (t = HASH_AlgNULL + 1; t < HASH_AlgTOTAL; t++)
+	{
+		SECOidTag 	hash_oid;
+		char *p;
+
+		hash_oid = nss_GetHashOidTagByHashType(t);
+
+		if (hash_oid == SEC_OID_UNKNOWN)
+			return PXE_NO_HASH;
+
+		hash = SECOID_FindOIDByTag(hash_oid);
+		if (pg_strcasecmp(hash->desc, name) == 0)
+		{
+			found = true;
+			break;
+		}
+
+		/*
+		 * NSS saves the algorithm names using SHA-xxx notation whereas
+		 * OpenSSL use SHAxxx. To make sure the user finds the requested
+		 * algorithm let's remove the dash and compare that spelling as well.
+		 */
+		if ((p = strchr(hash->desc, '-')) != NULL)
+		{
+			char tmp[12];
+
+			memcpy(tmp, hash->desc, p - hash->desc);
+			memcpy(tmp + (p - hash->desc), p + 1, strlen(hash->desc) - (p - hash->desc) + 1);
+			if (pg_strcasecmp(tmp, name) == 0)
+			{
+				found = true;
+				break;
+			}
+		}
+	}
+
+	if (!found)
+		return PXE_NO_HASH;
+
+	digest = palloc(sizeof(*digest));
+
+	digest->context = nss_context;
+	digest->hash_context = PK11_CreateDigestContext(hash->offset);
+	digest->hash_type = t;
+	if (digest->hash_context == NULL)
+	{
+		pfree(digest);
+		return -1;
+	}
+
+	status = PK11_DigestBegin(digest->hash_context);
+	if (status != SECSuccess)
+	{
+		PK11_DestroyContext(digest->hash_context, PR_TRUE);
+		pfree(digest);
+		return -1;
+	}
+
+	pxmd = palloc(sizeof(*pxmd));
+	pxmd->result_size = nss_digest_result_size;
+	pxmd->block_size = nss_digest_block_size;
+	pxmd->reset = nss_digest_reset;
+	pxmd->update = nss_digest_update;
+	pxmd->finish = nss_digest_finish;
+	pxmd->free = nss_digest_free;
+	pxmd->p.ptr = (void *) digest;
+
+	*res = pxmd;
+
+	return 0;
+}
+
+static int
+bf_init(PX_Cipher *pxc, const uint8 *key, unsigned klen, const uint8 *iv)
+{
+	internal_cipher *cipher = (internal_cipher *) pxc->ptr;
+
+	blowfish_setkey(&cipher->context, key, klen);
+	if (iv)
+		blowfish_setiv(&cipher->context, iv);
+
+	return 0;
+}
+
+static int
+bf_encrypt(PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res)
+{
+	internal_cipher *cipher = (internal_cipher *) pxc->ptr;
+	uint8 *buf;
+
+	if (dlen == 0)
+		return 0;
+
+	if (dlen & 7)
+		return PXE_NOTBLOCKSIZE;
+
+	buf = palloc(dlen);
+	memcpy(buf, data, dlen);
+
+	if (cipher->impl->mechanism.internal == BLOWFISH_ECB)
+		blowfish_encrypt_ecb(buf, dlen, &cipher->context);
+	else
+		blowfish_encrypt_cbc(buf, dlen, &cipher->context);
+
+	memcpy(res, buf, dlen);
+	pfree(buf);
+
+	return 0;
+}
+
+static int
+bf_decrypt(PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res)
+{
+	internal_cipher *cipher = (internal_cipher *) pxc->ptr;
+
+	if (dlen == 0)
+		return 0;
+
+	if (dlen & 7)
+		return PXE_NOTBLOCKSIZE;
+
+	memcpy(res, data, dlen);
+	if (cipher->impl->mechanism.internal == BLOWFISH_ECB)
+		blowfish_decrypt_ecb(res, dlen, &cipher->context);
+	else
+		blowfish_decrypt_cbc(res, dlen, &cipher->context);
+
+	return 0;
+}
+
+static void
+bf_free(PX_Cipher *pxc)
+{
+	internal_cipher *cipher = (internal_cipher *) pxc->ptr;
+
+	pfree(cipher);
+	pfree(pxc);
+}
+
+static int
+nss_symkey_blockcipher_init(PX_Cipher *pxc, const uint8 *key, unsigned klen,
+							const uint8 *iv)
+{
+	nss_cipher	   *cipher = (nss_cipher *) pxc->ptr;
+	SECItem			iv_item;
+	unsigned char  *iv_item_data;
+	SECItem			key_item;
+	int				keylen;
+	PK11SlotInfo   *slot;
+
+	if (cipher->impl->mechanism.nss == CKM_AES_CBC ||
+		cipher->impl->mechanism.nss == CKM_AES_ECB)
+	{
+		if (klen <= 128 / 8)
+			keylen = 128 / 8;
+		else if (klen <= 192 / 8)
+			keylen = 192 / 8;
+		else if (klen <= 256 / 8)
+			keylen = 256 / 8;
+		else
+			return PXE_CIPHER_INIT;
+	}
+	else
+		keylen = cipher->impl->keylen;
+
+	key_item.type = siBuffer;
+	key_item.data = (unsigned char *) key;
+	key_item.len = keylen;
+
+	/*
+	 * If hardware acceleration is configured in NSS one can theoretically get
+	 * a better slot by calling PK11_GetBestSlot() with the mechanism passed
+	 * to it. Unless there are complaints, using the simpler API will make
+	 * error handling easier though.
+	 */
+	slot = PK11_GetInternalSlot();
+	if (!slot)
+		return PXE_CIPHER_INIT;
+
+	/*
+	 * The key must be set up for the operation, and since we don't know at
+	 * this point whether we are asked to encrypt or decrypt we need to store
+	 * both versions.
+	 */
+	cipher->decrypt_key = PK11_ImportSymKey(slot, cipher->impl->mechanism.nss,
+											PK11_OriginUnwrap,
+											CKA_DECRYPT, &key_item,
+											NULL);
+	cipher->encrypt_key = PK11_ImportSymKey(slot, cipher->impl->mechanism.nss,
+											PK11_OriginUnwrap,
+											CKA_ENCRYPT, &key_item,
+											NULL);
+	PK11_FreeSlot(slot);
+
+	if (!cipher->decrypt_key || !cipher->encrypt_key)
+		return PXE_CIPHER_INIT;
+
+	if (iv)
+	{
+		iv_item.type = siBuffer;
+		iv_item.data = (unsigned char *) iv;
+		iv_item.len = nss_get_iv_size(pxc);
+	}
+	else
+	{
+		/*
+		 * The documentation states that either passing .data = 0; .len = 0;
+		 * in the iv_item, or NULL as iv_item, to PK11_ParamFromIV should be
+		 * done when IV is missing. That however leads to segfaults in the
+		 * library, the workaround that works in modern  library versions is
+		 * to pass in a keysized zeroed out IV.
+		 */
+		iv_item_data = palloc0(nss_get_iv_size(pxc));
+		iv_item.type = siBuffer;
+		iv_item.data = iv_item_data;
+		iv_item.len = nss_get_iv_size(pxc);
+	}
+
+	cipher->params = PK11_ParamFromIV(cipher->impl->mechanism.nss, &iv_item);
+
+	/* If we had to make a mock IV, free it once made into a param */
+	if (!iv)
+		pfree(iv_item_data);
+
+	if (cipher->params == NULL)
+		return PXE_CIPHER_INIT;
+
+	return 0;
+}
+
+static int
+nss_decrypt(PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res)
+{
+	nss_cipher *cipher = (nss_cipher *) pxc->ptr;
+	SECStatus	status;
+	int outlen;
+
+	if (!cipher->crypt_context)
+	{
+		cipher->crypt_context =
+			PK11_CreateContextBySymKey(cipher->impl->mechanism.nss, CKA_DECRYPT,
+									   cipher->decrypt_key, cipher->params);
+	}
+
+	status = PK11_CipherOp(cipher->crypt_context, res, &outlen, dlen, data, dlen);
+	if (status != SECSuccess)
+		return PXE_DECRYPT_FAILED;
+
+	return 0;
+}
+
+static int
+nss_encrypt(PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res)
+{
+	nss_cipher *cipher = (nss_cipher *) pxc->ptr;
+	SECStatus	status;
+	int outlen;
+
+	if (!cipher->crypt_context)
+	{
+		cipher->crypt_context =
+			PK11_CreateContextBySymKey(cipher->impl->mechanism.nss, CKA_ENCRYPT,
+									   cipher->decrypt_key, cipher->params);
+	}
+
+	status = PK11_CipherOp(cipher->crypt_context, res, &outlen, dlen, data, dlen);
+
+	if (status != SECSuccess)
+		return PXE_DECRYPT_FAILED;
+
+	return 0;
+}
+
+static void
+nss_free(PX_Cipher *pxc)
+{
+	nss_cipher *cipher = pxc->ptr;
+	PRBool		free_ctx = PR_TRUE;
+
+	PK11_FreeSymKey(cipher->encrypt_key);
+	PK11_FreeSymKey(cipher->decrypt_key);
+	PK11_DestroyContext(cipher->crypt_context, free_ctx);
+	NSS_ShutdownContext(cipher->context);
+	pfree(cipher);
+
+	pfree(pxc);
+}
+
+static unsigned
+nss_get_block_size(PX_Cipher *pxc)
+{
+	nss_cipher *cipher = pxc->ptr;
+
+	return PK11_GetBlockSize(cipher->impl->mechanism.nss, NULL);
+}
+
+static unsigned
+nss_get_key_size(PX_Cipher *pxc)
+{
+	nss_cipher *cipher = pxc->ptr;
+
+	return cipher->impl->keylen;
+}
+
+static unsigned
+nss_get_iv_size(PX_Cipher *pxc)
+{
+	nss_cipher *cipher = pxc->ptr;
+
+	return PK11_GetIVLength(cipher->impl->mechanism.nss);
+}
+
+static unsigned
+bf_get_block_size(PX_Cipher *pxc)
+{
+	return 8;
+}
+
+static unsigned
+bf_get_key_size(PX_Cipher *pxc)
+{
+	return 448 / 8;
+}
+
+static unsigned
+bf_get_iv_size(PX_Cipher *pxc)
+{
+	return 8;
+}
+
+/*
+ * Cipher Implementations
+ */
+static const cipher_implementation nss_des_cbc = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_DES_CBC,
+	.keylen = 8,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_des_ecb = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_DES_ECB,
+	.keylen = 8,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_des3_cbc = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_DES3_CBC,
+	.keylen = 24,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_des3_ecb = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_DES3_ECB,
+	.keylen = 24,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_aes_cbc = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_AES_CBC,
+	.keylen = 32,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_aes_ecb = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_AES_ECB,
+	.keylen = 32,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_bf_ecb = {
+	.init = bf_init,
+	.get_block_size = bf_get_block_size,
+	.get_key_size = bf_get_key_size,
+	.get_iv_size = bf_get_iv_size,
+	.encrypt = bf_encrypt,
+	.decrypt = bf_decrypt,
+	.free = bf_free,
+	.mechanism.internal = BLOWFISH_ECB,
+	.keylen = 56,
+	.is_nss = false
+};
+
+static const cipher_implementation nss_bf_cbc = {
+	.init = bf_init,
+	.get_block_size = bf_get_block_size,
+	.get_key_size = bf_get_key_size,
+	.get_iv_size = bf_get_iv_size,
+	.encrypt = bf_encrypt,
+	.decrypt = bf_decrypt,
+	.free = bf_free,
+	.mechanism.internal = BLOWFISH_CBC,
+	.keylen = 56,
+	.is_nss = false
+};
+
+/*
+ * Lookup table for finding the implementation based on a name. CAST5 as well
+ * as BLOWFISH are defined as cipher mechanisms in NSS but error out with
+ * SEC_ERROR_INVALID_ALGORITHM. Blowfish is implemented using the internal
+ * implementation while CAST5 isn't supported at all at this time,
+ */
+static const nss_cipher_ref nss_cipher_lookup[] = {
+	{"des", &nss_des_cbc},
+	{"des-cbc", &nss_des_cbc},
+	{"des-ecb", &nss_des_ecb},
+	{"des3-cbc", &nss_des3_cbc},
+	{"3des", &nss_des3_cbc},
+	{"3des-cbc", &nss_des3_cbc},
+	{"des3-ecb", &nss_des3_ecb},
+	{"3des-ecb", &nss_des3_ecb},
+	{"aes", &nss_aes_cbc},
+	{"aes-cbc", &nss_aes_cbc},
+	{"aes-ecb", &nss_aes_ecb},
+	{"rijndael", &nss_aes_cbc},
+	{"rijndael-cbc", &nss_aes_cbc},
+	{"rijndael-ecb", &nss_aes_ecb},
+	{"blowfish", &nss_bf_cbc},
+	{"blowfish-cbc", &nss_bf_cbc},
+	{"blowfish-ecb", &nss_bf_ecb},
+	{"bf", &nss_bf_cbc},
+	{"bf-cbc", &nss_bf_cbc},
+	{"bf-ecb", &nss_bf_ecb},
+	{NULL}
+};
+
+/*
+ * px_find_cipher
+ *
+ * Search for the requested cipher and see if there is support for it, and if
+ * so return an allocated object containing the playbook for how to encrypt
+ * and decrypt using the cipher.
+ */
+int
+px_find_cipher(const char *alias, PX_Cipher **res)
+{
+	const nss_cipher_ref *cipher_ref;
+	PX_Cipher  *px_cipher;
+	NSSInitParameters params;
+	NSSInitContext *nss_context;
+	nss_cipher	*cipher;
+	internal_cipher *int_cipher;
+
+	for (cipher_ref = nss_cipher_lookup; cipher_ref->name; cipher_ref++)
+	{
+		if (strcmp(cipher_ref->name, alias) == 0)
+			break;
+	}
+
+	if (!cipher_ref->name)
+		return PXE_NO_CIPHER;
+
+	/*
+	 * Fill in the PX_Cipher to pass back to PX describing the operations to
+	 * perform in order to use the cipher.
+	 */
+	px_cipher = palloc(sizeof(*px_cipher));
+	px_cipher->block_size = cipher_ref->impl->get_block_size;
+	px_cipher->key_size = cipher_ref->impl->get_key_size;
+	px_cipher->iv_size = cipher_ref->impl->get_iv_size;
+	px_cipher->free = cipher_ref->impl->free;
+	px_cipher->init = cipher_ref->impl->init;
+	px_cipher->encrypt = cipher_ref->impl->encrypt;
+	px_cipher->decrypt = cipher_ref->impl->decrypt;
+
+	/*
+	 * Set the private data, which is different for NSS and internal ciphers
+	 */
+	if (cipher_ref->impl->is_nss)
+	{
+		/*
+		 * Initialize our own NSS context without a database backing it. At
+		 * some point we might want to allow users to use stored keys in the
+		 * database rather than passing them via SELECT encrypt(), and then
+		 * this need to be changed to open a user specified database.
+		 */
+		memset(&params, 0, sizeof(params));
+		params.length = sizeof(params);
+		nss_context = NSS_InitContext("", "", "", "", &params,
+									  NSS_INIT_READONLY | NSS_INIT_NOCERTDB |
+									  NSS_INIT_NOMODDB | NSS_INIT_FORCEOPEN |
+									  NSS_INIT_NOROOTINIT | NSS_INIT_PK11RELOAD);
+
+		/* nss_cipher is the private state struct for the operation */
+		cipher = palloc(sizeof(*cipher));
+		cipher->context = nss_context;
+		cipher->impl = cipher_ref->impl;
+		cipher->crypt_context = NULL;
+
+		px_cipher->ptr = cipher;
+	}
+	else
+	{
+		int_cipher = palloc0(sizeof(*int_cipher));
+
+		int_cipher->impl = cipher_ref->impl;
+		px_cipher->ptr = int_cipher;
+	}
+
+	*res = px_cipher;
+	return 0;
+}
diff --git a/contrib/pgcrypto/px.c b/contrib/pgcrypto/px.c
index 6a4681dae9..a243f575d3 100644
--- a/contrib/pgcrypto/px.c
+++ b/contrib/pgcrypto/px.c
@@ -58,6 +58,7 @@ static const struct error_desc px_err_list[] = {
 	{PXE_MCRYPT_INTERNAL, "mcrypt internal error"},
 	{PXE_NO_RANDOM, "Failed to generate strong random bits"},
 	{PXE_DECRYPT_FAILED, "Decryption failed"},
+	{PXE_ENCRYPT_FAILED, "Encryption failed"},
 	{PXE_PGP_CORRUPT_DATA, "Wrong key or corrupt data"},
 	{PXE_PGP_CORRUPT_ARMOR, "Corrupt ascii-armor"},
 	{PXE_PGP_UNSUPPORTED_COMPR, "Unsupported compression algorithm"},
diff --git a/contrib/pgcrypto/px.h b/contrib/pgcrypto/px.h
index 5487923edb..17d6f22498 100644
--- a/contrib/pgcrypto/px.h
+++ b/contrib/pgcrypto/px.h
@@ -61,6 +61,7 @@
 #define PXE_MCRYPT_INTERNAL			-16
 #define PXE_NO_RANDOM				-17
 #define PXE_DECRYPT_FAILED			-18
+#define PXE_ENCRYPT_FAILED			-19
 
 #define PXE_PGP_CORRUPT_DATA		-100
 #define PXE_PGP_CORRUPT_ARMOR		-101
diff --git a/contrib/sslinfo/sslinfo.c b/contrib/sslinfo/sslinfo.c
index 5ba3988e27..84bb2c65b8 100644
--- a/contrib/sslinfo/sslinfo.c
+++ b/contrib/sslinfo/sslinfo.c
@@ -9,9 +9,11 @@
 
 #include "postgres.h"
 
+#ifdef USE_OPENSSL
 #include <openssl/x509.h>
 #include <openssl/x509v3.h>
 #include <openssl/asn1.h>
+#endif
 
 #include "access/htup_details.h"
 #include "funcapi.h"
@@ -21,8 +23,8 @@
 
 PG_MODULE_MAGIC;
 
+#ifdef USE_OPENSSL
 static Datum X509_NAME_field_to_text(X509_NAME *name, text *fieldName);
-static Datum X509_NAME_to_text(X509_NAME *name);
 static Datum ASN1_STRING_to_text(ASN1_STRING *str);
 
 /*
@@ -32,6 +34,7 @@ typedef struct
 {
 	TupleDesc	tupdesc;
 } SSLExtensionInfoContext;
+#endif
 
 /*
  * Indicates whether current session uses SSL
@@ -54,9 +57,16 @@ PG_FUNCTION_INFO_V1(ssl_version);
 Datum
 ssl_version(PG_FUNCTION_ARGS)
 {
-	if (MyProcPort->ssl == NULL)
+	const char *version;
+
+	if (!MyProcPort->ssl_in_use)
+		PG_RETURN_NULL();
+
+	version = be_tls_get_version(MyProcPort);
+	if (version == NULL)
 		PG_RETURN_NULL();
-	PG_RETURN_TEXT_P(cstring_to_text(SSL_get_version(MyProcPort->ssl)));
+
+	PG_RETURN_TEXT_P(cstring_to_text(version));
 }
 
 
@@ -67,9 +77,16 @@ PG_FUNCTION_INFO_V1(ssl_cipher);
 Datum
 ssl_cipher(PG_FUNCTION_ARGS)
 {
-	if (MyProcPort->ssl == NULL)
+	const char *cipher;
+
+	if (!MyProcPort->ssl_in_use)
 		PG_RETURN_NULL();
-	PG_RETURN_TEXT_P(cstring_to_text(SSL_get_cipher(MyProcPort->ssl)));
+
+	cipher = be_tls_get_cipher(MyProcPort);
+	if (cipher == NULL)
+		PG_RETURN_NULL();
+
+	PG_RETURN_TEXT_P(cstring_to_text(cipher));
 }
 
 
@@ -83,7 +100,7 @@ PG_FUNCTION_INFO_V1(ssl_client_cert_present);
 Datum
 ssl_client_cert_present(PG_FUNCTION_ARGS)
 {
-	PG_RETURN_BOOL(MyProcPort->peer != NULL);
+	PG_RETURN_BOOL(MyProcPort->peer_cert_valid);
 }
 
 
@@ -99,29 +116,26 @@ PG_FUNCTION_INFO_V1(ssl_client_serial);
 Datum
 ssl_client_serial(PG_FUNCTION_ARGS)
 {
+	char decimal[NAMEDATALEN];
 	Datum		result;
-	Port	   *port = MyProcPort;
-	X509	   *peer = port->peer;
-	ASN1_INTEGER *serial = NULL;
-	BIGNUM	   *b;
-	char	   *decimal;
 
-	if (!peer)
+	if (!MyProcPort->ssl_in_use || !MyProcPort->peer_cert_valid)
+		PG_RETURN_NULL();
+
+	be_tls_get_peer_serial(MyProcPort, decimal, NAMEDATALEN);
+
+	if (!*decimal)
 		PG_RETURN_NULL();
-	serial = X509_get_serialNumber(peer);
-	b = ASN1_INTEGER_to_BN(serial, NULL);
-	decimal = BN_bn2dec(b);
 
-	BN_free(b);
 	result = DirectFunctionCall3(numeric_in,
 								 CStringGetDatum(decimal),
 								 ObjectIdGetDatum(0),
 								 Int32GetDatum(-1));
-	OPENSSL_free(decimal);
 	return result;
 }
 
 
+#ifdef USE_OPENSSL
 /*
  * Converts OpenSSL ASN1_STRING structure into text
  *
@@ -228,7 +242,7 @@ ssl_client_dn_field(PG_FUNCTION_ARGS)
 	text	   *fieldname = PG_GETARG_TEXT_PP(0);
 	Datum		result;
 
-	if (!(MyProcPort->peer))
+	if (!MyProcPort->ssl_in_use || !MyProcPort->peer_cert_valid)
 		PG_RETURN_NULL();
 
 	result = X509_NAME_field_to_text(X509_get_subject_name(MyProcPort->peer), fieldname);
@@ -273,76 +287,23 @@ ssl_issuer_field(PG_FUNCTION_ARGS)
 	else
 		return result;
 }
+#endif							/* USE_OPENSSL */
 
-
-/*
- * Equivalent of X509_NAME_oneline that respects encoding
- *
- * This function converts X509_NAME structure to the text variable
- * converting all textual data into current database encoding.
- *
- * Parameter: X509_NAME *name X509_NAME structure to be converted
- *
- * Returns: text datum which contains string representation of
- * X509_NAME
- */
-static Datum
-X509_NAME_to_text(X509_NAME *name)
+#ifdef USE_NSS
+PG_FUNCTION_INFO_V1(ssl_client_dn_field);
+Datum
+ssl_client_dn_field(PG_FUNCTION_ARGS)
 {
-	BIO		   *membuf = BIO_new(BIO_s_mem());
-	int			i,
-				nid,
-				count = X509_NAME_entry_count(name);
-	X509_NAME_ENTRY *e;
-	ASN1_STRING *v;
-	const char *field_name;
-	size_t		size;
-	char		nullterm;
-	char	   *sp;
-	char	   *dp;
-	text	   *result;
-
-	if (membuf == NULL)
-		ereport(ERROR,
-				(errcode(ERRCODE_OUT_OF_MEMORY),
-				 errmsg("could not create OpenSSL BIO structure")));
-
-	(void) BIO_set_close(membuf, BIO_CLOSE);
-	for (i = 0; i < count; i++)
-	{
-		e = X509_NAME_get_entry(name, i);
-		nid = OBJ_obj2nid(X509_NAME_ENTRY_get_object(e));
-		if (nid == NID_undef)
-			ereport(ERROR,
-					(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
-					 errmsg("could not get NID for ASN1_OBJECT object")));
-		v = X509_NAME_ENTRY_get_data(e);
-		field_name = OBJ_nid2sn(nid);
-		if (field_name == NULL)
-			field_name = OBJ_nid2ln(nid);
-		if (field_name == NULL)
-			ereport(ERROR,
-					(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
-					 errmsg("could not convert NID %d to an ASN1_OBJECT structure", nid)));
-		BIO_printf(membuf, "/%s=", field_name);
-		ASN1_STRING_print_ex(membuf, v,
-							 ((ASN1_STRFLGS_RFC2253 & ~ASN1_STRFLGS_ESC_MSB)
-							  | ASN1_STRFLGS_UTF8_CONVERT));
-	}
-
-	/* ensure null termination of the BIO's content */
-	nullterm = '\0';
-	BIO_write(membuf, &nullterm, 1);
-	size = BIO_get_mem_data(membuf, &sp);
-	dp = pg_any_to_server(sp, size - 1, PG_UTF8);
-	result = cstring_to_text(dp);
-	if (dp != sp)
-		pfree(dp);
-	if (BIO_free(membuf) != 1)
-		elog(ERROR, "could not free OpenSSL BIO structure");
+	PG_RETURN_NULL();
+}
 
-	PG_RETURN_TEXT_P(result);
+PG_FUNCTION_INFO_V1(ssl_issuer_field);
+Datum
+ssl_issuer_field(PG_FUNCTION_ARGS)
+{
+	PG_RETURN_NULL();
 }
+#endif							/* USE_NSS */
 
 
 /*
@@ -358,9 +319,17 @@ PG_FUNCTION_INFO_V1(ssl_client_dn);
 Datum
 ssl_client_dn(PG_FUNCTION_ARGS)
 {
-	if (!(MyProcPort->peer))
+	char		subject[NAMEDATALEN];
+
+	if (!MyProcPort->ssl_in_use || !MyProcPort->peer_cert_valid)
+		PG_RETURN_NULL();
+
+	be_tls_get_peer_subject_name(MyProcPort, subject, NAMEDATALEN);
+
+	if (!*subject)
 		PG_RETURN_NULL();
-	return X509_NAME_to_text(X509_get_subject_name(MyProcPort->peer));
+
+	PG_RETURN_TEXT_P(cstring_to_text(subject));
 }
 
 
@@ -377,12 +346,21 @@ PG_FUNCTION_INFO_V1(ssl_issuer_dn);
 Datum
 ssl_issuer_dn(PG_FUNCTION_ARGS)
 {
-	if (!(MyProcPort->peer))
+	char		issuer[NAMEDATALEN];
+
+	if (!MyProcPort->ssl_in_use || !MyProcPort->peer_cert_valid)
+		PG_RETURN_NULL();
+
+	be_tls_get_peer_issuer_name(MyProcPort, issuer, NAMEDATALEN);
+
+	if (!*issuer)
 		PG_RETURN_NULL();
-	return X509_NAME_to_text(X509_get_issuer_name(MyProcPort->peer));
+
+	PG_RETURN_TEXT_P(cstring_to_text(issuer));
 }
 
 
+#ifdef USE_OPENSSL
 /*
  * Returns information about available SSL extensions.
  *
@@ -516,3 +494,13 @@ ssl_extension_info(PG_FUNCTION_ARGS)
 	/* All done */
 	SRF_RETURN_DONE(funcctx);
 }
+#endif							/* USE_OPENSSL */
+
+#ifdef USE_NSS
+PG_FUNCTION_INFO_V1(ssl_extension_info);
+Datum
+ssl_extension_info(PG_FUNCTION_ARGS)
+{
+	PG_RETURN_NULL();
+}
+#endif							/* USE_NSS */
diff --git a/doc/src/sgml/pgcrypto.sgml b/doc/src/sgml/pgcrypto.sgml
index 8748c64e2d..f03e1f5fcf 100644
--- a/doc/src/sgml/pgcrypto.sgml
+++ b/doc/src/sgml/pgcrypto.sgml
@@ -45,8 +45,9 @@ digest(data bytea, type text) returns bytea
     <literal>sha224</literal>, <literal>sha256</literal>,
     <literal>sha384</literal> and <literal>sha512</literal>.
     If <filename>pgcrypto</filename> was built with
-    <productname>OpenSSL</productname>, more algorithms are available, as
-    detailed in <xref linkend="pgcrypto-with-without-openssl"/>.
+    <productname>OpenSSL</productname> or <productname>NSS</productname>,
+    more algorithms are available, as
+    detailed in <xref linkend="pgcrypto-with-without-openssl-nss"/>.
    </para>
 
    <para>
@@ -763,7 +764,7 @@ pgp_sym_encrypt(data, psw, 'compress-algo=1, cipher-algo=aes256')
     Which cipher algorithm to use.
    </para>
 <literallayout>
-Values: bf, aes128, aes192, aes256 (OpenSSL-only: <literal>3des</literal>, <literal>cast5</literal>)
+Values: bf, aes128, aes192, aes256 (OpenSSL-only: <literal>3des</literal>, <literal>cast5</literal>; NSS-only: <literal>3des</literal>)
 Default: aes128
 Applies to: pgp_sym_encrypt, pgp_pub_encrypt
 </literallayout>
@@ -1152,8 +1153,8 @@ gen_random_uuid() returns uuid
    <para>
     <filename>pgcrypto</filename> configures itself according to the findings of the
     main PostgreSQL <literal>configure</literal> script.  The options that
-    affect it are <literal>--with-zlib</literal> and
-    <literal>--with-openssl</literal>.
+    affect it are <literal>--with-zlib</literal>,
+    <literal>--with-openssl</literal> and <literal>--with-nss</literal>.
    </para>
 
    <para>
@@ -1168,14 +1169,16 @@ gen_random_uuid() returns uuid
     BIGNUM functions.
    </para>
 
-   <table id="pgcrypto-with-without-openssl">
-    <title>Summary of Functionality with and without OpenSSL</title>
-    <tgroup cols="3">
+   <table id="pgcrypto-with-without-openssl-nss">
+    <title>Summary of Functionality with and without external cryptographic
+      library</title>
+    <tgroup cols="4">
      <thead>
       <row>
        <entry>Functionality</entry>
        <entry>Built-in</entry>
        <entry>With OpenSSL</entry>
+       <entry>With NSS</entry>
       </row>
      </thead>
      <tbody>
@@ -1183,51 +1186,67 @@ gen_random_uuid() returns uuid
        <entry>MD5</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>SHA1</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>SHA224/256/384/512</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>Other digest algorithms</entry>
        <entry>no</entry>
        <entry>yes (Note 1)</entry>
+       <entry>yes (Note 1)</entry>
       </row>
       <row>
        <entry>Blowfish</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>AES</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>DES/3DES/CAST5</entry>
        <entry>no</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
+      </row>
+      <row>
+       <entry>CAST5</entry>
+       <entry>no</entry>
+       <entry>yes</entry>
+       <entry>no</entry>
       </row>
       <row>
        <entry>Raw encryption</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>PGP Symmetric encryption</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>PGP Public-Key encryption</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
      </tbody>
     </tgroup>
@@ -1240,7 +1259,8 @@ gen_random_uuid() returns uuid
    <orderedlist>
     <listitem>
      <para>
-      Any digest algorithm <productname>OpenSSL</productname> supports
+      Any digest algorithm <productname>OpenSSL</productname> and
+      <productname>NSS</productname> supports
       is automatically picked up.
       This is not possible with ciphers, which need to be supported
       explicitly.
diff --git a/doc/src/sgml/sslinfo.sgml b/doc/src/sgml/sslinfo.sgml
index e16f61b41d..e8a4e7b332 100644
--- a/doc/src/sgml/sslinfo.sgml
+++ b/doc/src/sgml/sslinfo.sgml
@@ -22,7 +22,8 @@
 
  <para>
   This extension won't build at all unless the installation was
-  configured with <literal>--with-openssl</literal>.
+  configured with SSL support, such as <literal>--with-openssl</literal>
+  or <literal>--with-nss</literal>.
  </para>
 
  <sect2>
@@ -208,6 +209,9 @@ emailAddress
      the X.500 and X.509 standards, so you cannot just assign arbitrary
      meaning to them.
     </para>
+    <para>
+     This function is only available when using <productname>OpenSSL</productname>.
+    </para>
     </listitem>
    </varlistentry>
 
@@ -223,6 +227,9 @@ emailAddress
      Same as <function>ssl_client_dn_field</function>, but for the certificate issuer
      rather than the certificate subject.
     </para>
+    <para>
+     This function is only available when using <productname>OpenSSL</productname>.
+    </para>
     </listitem>
    </varlistentry>
 
@@ -238,6 +245,9 @@ emailAddress
      Provide information about extensions of client certificate: extension name,
      extension value, and if it is a critical extension.
     </para>
+    <para>
+     This function is only available when using <productname>OpenSSL</productname>.
+    </para>
     </listitem>
    </varlistentry>
   </variablelist>
diff --git a/src/tools/msvc/Install.pm b/src/tools/msvc/Install.pm
index ea3af48777..afe72a7e97 100644
--- a/src/tools/msvc/Install.pm
+++ b/src/tools/msvc/Install.pm
@@ -438,7 +438,8 @@ sub CopyContribFiles
 		{
 			# These configuration-based exclusions must match vcregress.pl
 			next if ($d eq "uuid-ossp"  && !defined($config->{uuid}));
-			next if ($d eq "sslinfo"    && !defined($config->{openssl}));
+			next if ($d eq "sslinfo"    && !defined($config->{openssl})
+			  && !defined($config->{nss}));
 			next if ($d eq "xml2"       && !defined($config->{xml}));
 			next if ($d =~ /_plperl$/   && !defined($config->{perl}));
 			next if ($d =~ /_plpython$/ && !defined($config->{python}));
diff --git a/src/tools/msvc/Mkvcbuild.pm b/src/tools/msvc/Mkvcbuild.pm
index 29879b51af..379f861a56 100644
--- a/src/tools/msvc/Mkvcbuild.pm
+++ b/src/tools/msvc/Mkvcbuild.pm
@@ -442,9 +442,14 @@ sub mkvcbuild
 		push @contrib_excludes, 'xml2';
 	}
 
+	if (!$solution->{options}->{openssl} && !$solution->{options}->{nss})
+	{
+		push @contrib_excludes, 'sslinfo';
+	}
+
 	if (!$solution->{options}->{openssl})
 	{
-		push @contrib_excludes, 'sslinfo', 'ssl_passphrase_callback';
+		push @contrib_excludes, 'ssl_passphrase_callback';
 	}
 
 	if (!$solution->{options}->{uuid})
@@ -474,6 +479,11 @@ sub mkvcbuild
 		$pgcrypto->AddFiles('contrib/pgcrypto', 'openssl.c',
 			'pgp-mpi-openssl.c');
 	}
+	elsif ($solution->{options}->{nss})
+	{
+		$pgcrypto->AddFiles('contrib/pgcrypto', 'nss.c',
+			'pgp-mpi-internal.c', 'imath.c', 'blf.c');
+	}
 	else
 	{
 		$pgcrypto->AddFiles(
-- 
2.21.1 (Apple Git-122.3)

From ef84f48a34d3076c4706b414033f1a388be8c990 Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Wed, 28 Oct 2020 11:35:06 +0100
Subject: [PATCH v15 6/6] NSS to be submitted separately

---
 contrib/pgcrypto/openssl.c            |  2 +-
 doc/src/sgml/sslinfo.sgml             |  2 +-
 src/backend/libpq/be-secure-openssl.c | 16 +++++++++++++++-
 3 files changed, 17 insertions(+), 3 deletions(-)

diff --git a/contrib/pgcrypto/openssl.c b/contrib/pgcrypto/openssl.c
index ed96e4ce53..5ebe213406 100644
--- a/contrib/pgcrypto/openssl.c
+++ b/contrib/pgcrypto/openssl.c
@@ -400,7 +400,7 @@ gen_ossl_encrypt(PX_Cipher *c, const uint8 *data, unsigned dlen,
 	}
 
 	if (!EVP_EncryptUpdate(od->evp_ctx, res, &outlen, data, dlen))
-		return PXE_ERR_GENERIC;
+		return PXE_ENCRYPT_FAILED;
 
 	return 0;
 }
diff --git a/doc/src/sgml/sslinfo.sgml b/doc/src/sgml/sslinfo.sgml
index e8a4e7b332..253bb697af 100644
--- a/doc/src/sgml/sslinfo.sgml
+++ b/doc/src/sgml/sslinfo.sgml
@@ -55,7 +55,7 @@
     <listitem>
     <para>
      Returns the name of the protocol used for the SSL connection (e.g., TLSv1.0
-     TLSv1.1, or TLSv1.2).
+     TLSv1.1, TLSv1.2 or TLSv1.3).
     </para>
     </listitem>
    </varlistentry>
diff --git a/src/backend/libpq/be-secure-openssl.c b/src/backend/libpq/be-secure-openssl.c
index 8b21ff4065..5962cffc0c 100644
--- a/src/backend/libpq/be-secure-openssl.c
+++ b/src/backend/libpq/be-secure-openssl.c
@@ -1298,15 +1298,28 @@ X509_NAME_to_cstring(X509_NAME *name)
 	char	   *dp;
 	char	   *result;
 
+	if (membuf == NULL)
+		ereport(ERROR,
+				(errcode(ERRCODE_OUT_OF_MEMORY),
+				 errmsg("failed to create BIO")));
+
 	(void) BIO_set_close(membuf, BIO_CLOSE);
 	for (i = 0; i < count; i++)
 	{
 		e = X509_NAME_get_entry(name, i);
 		nid = OBJ_obj2nid(X509_NAME_ENTRY_get_object(e));
+		if (nid == NID_undef)
+			ereport(ERROR,
+					(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
+					 errmsg("could not get NID for ASN1_OBJECT object")));
 		v = X509_NAME_ENTRY_get_data(e);
 		field_name = OBJ_nid2sn(nid);
 		if (!field_name)
 			field_name = OBJ_nid2ln(nid);
+		if (field_name == NULL)
+			ereport(ERROR,
+					(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
+					 errmsg("could not convert NID %d to an ASN1_OBJECT structure", nid)));
 		BIO_printf(membuf, "/%s=", field_name);
 		ASN1_STRING_print_ex(membuf, v,
 							 ((ASN1_STRFLGS_RFC2253 & ~ASN1_STRFLGS_ESC_MSB)
@@ -1322,7 +1335,8 @@ X509_NAME_to_cstring(X509_NAME *name)
 	result = pstrdup(dp);
 	if (dp != sp)
 		pfree(dp);
-	BIO_free(membuf);
+	if (BIO_free(membuf) != 1)
+		elog(ERROR, "could not free OpenSSL BIO structure");
 
 	return result;
 }
-- 
2.21.1 (Apple Git-122.3)

From 850e4ef964a5af1417ee97eb0fd7167a38f4eaa7 Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Wed, 28 Oct 2020 11:18:42 +0100
Subject: [PATCH v16 1/5] NSS Frontend, Backend and build infra

---
 configure                                     |  401 +++++-
 configure.ac                                  |   60 +-
 .../postgres_fdw/expected/postgres_fdw.out    |    2 +-
 src/Makefile.global.in                        |    2 +-
 src/backend/libpq/Makefile                    |    6 +-
 src/backend/libpq/auth.c                      |    7 +
 src/backend/libpq/be-secure-nss.c             | 1173 +++++++++++++++++
 src/backend/libpq/be-secure.c                 |    3 +
 src/backend/libpq/hba.c                       |    2 +-
 src/backend/utils/misc/guc.c                  |   20 +-
 src/common/Makefile                           |    2 +-
 src/include/common/pg_nss.h                   |  141 ++
 src/include/libpq/libpq-be.h                  |   13 +-
 src/include/libpq/libpq.h                     |    3 +
 src/include/pg_config.h.in                    |    3 +
 src/include/pg_config_manual.h                |    5 +-
 src/interfaces/libpq/Makefile                 |   13 +-
 src/interfaces/libpq/fe-connect.c             |    4 +
 src/interfaces/libpq/fe-secure-nss.c          | 1018 ++++++++++++++
 src/interfaces/libpq/fe-secure.c              |    5 +-
 src/interfaces/libpq/libpq-fe.h               |   11 +
 src/interfaces/libpq/libpq-int.h              |    5 +
 src/tools/msvc/Mkvcbuild.pm                   |   22 +-
 src/tools/msvc/Solution.pm                    |   20 +
 src/tools/msvc/config_default.pl              |    1 +
 25 files changed, 2871 insertions(+), 71 deletions(-)
 create mode 100644 src/backend/libpq/be-secure-nss.c
 create mode 100644 src/include/common/pg_nss.h
 create mode 100644 src/interfaces/libpq/fe-secure-nss.c

diff --git a/configure b/configure
index ace4ed5dec..6287a0e2fe 100755
--- a/configure
+++ b/configure
@@ -654,6 +654,9 @@ LIBOBJS
 UUID_LIBS
 LDAP_LIBS_BE
 LDAP_LIBS_FE
+with_ssl
+NSPR_CONFIG
+NSS_CONFIG
 PTHREAD_CFLAGS
 PTHREAD_LIBS
 PTHREAD_CC
@@ -711,7 +714,6 @@ with_uuid
 with_readline
 with_systemd
 with_selinux
-with_openssl
 with_ldap
 with_krb_srvnam
 krb_srvtab
@@ -856,7 +858,6 @@ with_pam
 with_bsd_auth
 with_ldap
 with_bonjour
-with_openssl
 with_selinux
 with_systemd
 with_readline
@@ -868,6 +869,8 @@ with_libxslt
 with_system_tzdata
 with_zlib
 with_gnu_ld
+with_ssl
+with_openssl
 enable_largefile
 '
       ac_precious_vars='build_alias
@@ -1558,7 +1561,6 @@ Optional Packages:
   --with-bsd-auth         build with BSD Authentication support
   --with-ldap             build with LDAP support
   --with-bonjour          build with Bonjour support
-  --with-openssl          build with OpenSSL support
   --with-selinux          build with SELinux support
   --with-systemd          build with systemd support
   --without-readline      do not use GNU Readline nor BSD Libedit for editing
@@ -1572,6 +1574,8 @@ Optional Packages:
                           use system time zone data in DIR
   --without-zlib          do not use Zlib
   --with-gnu-ld           assume the C compiler uses GNU ld [default=no]
+  --with-ssl=LIB          use LIB for SSL/TLS support (openssl, nss)
+  --with-openssl          obsolete spelling of --with-ssl=openssl
 
 Some influential environment variables:
   CC          C compiler command
@@ -8071,41 +8075,6 @@ fi
 $as_echo "$with_bonjour" >&6; }
 
 
-#
-# OpenSSL
-#
-{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether to build with OpenSSL support" >&5
-$as_echo_n "checking whether to build with OpenSSL support... " >&6; }
-
-
-
-# Check whether --with-openssl was given.
-if test "${with_openssl+set}" = set; then :
-  withval=$with_openssl;
-  case $withval in
-    yes)
-
-$as_echo "#define USE_OPENSSL 1" >>confdefs.h
-
-      ;;
-    no)
-      :
-      ;;
-    *)
-      as_fn_error $? "no argument expected for --with-openssl option" "$LINENO" 5
-      ;;
-  esac
-
-else
-  with_openssl=no
-
-fi
-
-
-{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $with_openssl" >&5
-$as_echo "$with_openssl" >&6; }
-
-
 #
 # SELinux
 #
@@ -12179,7 +12148,64 @@ fi
   fi
 fi
 
+#
+# SSL Library
+#
+# There are currently two supported SSL/TLS libraries, OpenSSL and NSS.
+#
+
+
+
+# Check whether --with-ssl was given.
+if test "${with_ssl+set}" = set; then :
+  withval=$with_ssl;
+  case $withval in
+    yes)
+      as_fn_error $? "argument required for --with-ssl option" "$LINENO" 5
+      ;;
+    no)
+      as_fn_error $? "argument required for --with-ssl option" "$LINENO" 5
+      ;;
+    *)
+
+      ;;
+  esac
+
+fi
+
+
+if test x"$with_ssl" = x"" ; then
+  with_ssl=no
+fi
+
+
+
+# Check whether --with-openssl was given.
+if test "${with_openssl+set}" = set; then :
+  withval=$with_openssl;
+  case $withval in
+    yes)
+      :
+      ;;
+    no)
+      :
+      ;;
+    *)
+      as_fn_error $? "no argument expected for --with-openssl option" "$LINENO" 5
+      ;;
+  esac
+
+else
+  with_openssl=no
+
+fi
+
+
 if test "$with_openssl" = yes ; then
+  with_ssl=openssl
+fi
+
+if test "$with_ssl" = openssl ; then
     # Minimum required OpenSSL version is 1.0.1
 
 $as_echo "#define OPENSSL_API_COMPAT 0x10001000L" >>confdefs.h
@@ -12440,8 +12466,280 @@ _ACEOF
 fi
 done
 
+
+$as_echo "#define USE_OPENSSL 1" >>confdefs.h
+
+elif test "$with_ssl" = nss ; then
+  # TODO: fallback in case nss-config/nspr-config aren't found.
+  if test -z "$NSS_CONFIG"; then
+  for ac_prog in nss-config
+do
+  # Extract the first word of "$ac_prog", so it can be a program name with args.
+set dummy $ac_prog; ac_word=$2
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
+$as_echo_n "checking for $ac_word... " >&6; }
+if ${ac_cv_path_NSS_CONFIG+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  case $NSS_CONFIG in
+  [\\/]* | ?:[\\/]*)
+  ac_cv_path_NSS_CONFIG="$NSS_CONFIG" # Let the user override the test with a path.
+  ;;
+  *)
+  as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH
+do
+  IFS=$as_save_IFS
+  test -z "$as_dir" && as_dir=.
+    for ac_exec_ext in '' $ac_executable_extensions; do
+  if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
+    ac_cv_path_NSS_CONFIG="$as_dir/$ac_word$ac_exec_ext"
+    $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
+    break 2
+  fi
+done
+  done
+IFS=$as_save_IFS
+
+  ;;
+esac
+fi
+NSS_CONFIG=$ac_cv_path_NSS_CONFIG
+if test -n "$NSS_CONFIG"; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $NSS_CONFIG" >&5
+$as_echo "$NSS_CONFIG" >&6; }
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
 fi
 
+
+  test -n "$NSS_CONFIG" && break
+done
+
+else
+  # Report the value of NSS_CONFIG in configure's output in all cases.
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for NSS_CONFIG" >&5
+$as_echo_n "checking for NSS_CONFIG... " >&6; }
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $NSS_CONFIG" >&5
+$as_echo "$NSS_CONFIG" >&6; }
+fi
+
+  if test -z "$NSPR_CONFIG"; then
+  for ac_prog in nspr-config
+do
+  # Extract the first word of "$ac_prog", so it can be a program name with args.
+set dummy $ac_prog; ac_word=$2
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
+$as_echo_n "checking for $ac_word... " >&6; }
+if ${ac_cv_path_NSPR_CONFIG+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  case $NSPR_CONFIG in
+  [\\/]* | ?:[\\/]*)
+  ac_cv_path_NSPR_CONFIG="$NSPR_CONFIG" # Let the user override the test with a path.
+  ;;
+  *)
+  as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH
+do
+  IFS=$as_save_IFS
+  test -z "$as_dir" && as_dir=.
+    for ac_exec_ext in '' $ac_executable_extensions; do
+  if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
+    ac_cv_path_NSPR_CONFIG="$as_dir/$ac_word$ac_exec_ext"
+    $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
+    break 2
+  fi
+done
+  done
+IFS=$as_save_IFS
+
+  ;;
+esac
+fi
+NSPR_CONFIG=$ac_cv_path_NSPR_CONFIG
+if test -n "$NSPR_CONFIG"; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $NSPR_CONFIG" >&5
+$as_echo "$NSPR_CONFIG" >&6; }
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+fi
+
+
+  test -n "$NSPR_CONFIG" && break
+done
+
+else
+  # Report the value of NSPR_CONFIG in configure's output in all cases.
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for NSPR_CONFIG" >&5
+$as_echo_n "checking for NSPR_CONFIG... " >&6; }
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $NSPR_CONFIG" >&5
+$as_echo "$NSPR_CONFIG" >&6; }
+fi
+
+  if test -n "$NSS_CONFIG"; then
+    NSS_LIBS=`$NSS_CONFIG --libs`
+	NSS_CFLAGS=`$NSS_CONFIG --cflags`
+  fi
+  if test -n "$NSPR_CONFIG"; then
+	NSPR_LIBS=`$NSPR_CONFIG --libs`
+	NSPR_CFLAGS=`$NSPR_CONFIG --cflags`
+  fi
+
+  LDFLAGS="$LDFLAGS $NSS_LIBS $NSPR_LIBS"
+  CFLAGS="$CFLAGS $NSS_CFLAGS $NSPR_CFLAGS"
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for SSL_VersionRangeSet in -lnss3" >&5
+$as_echo_n "checking for SSL_VersionRangeSet in -lnss3... " >&6; }
+if ${ac_cv_lib_nss3_SSL_VersionRangeSet+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lnss3  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char SSL_VersionRangeSet ();
+int
+main ()
+{
+return SSL_VersionRangeSet ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_lib_nss3_SSL_VersionRangeSet=yes
+else
+  ac_cv_lib_nss3_SSL_VersionRangeSet=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_nss3_SSL_VersionRangeSet" >&5
+$as_echo "$ac_cv_lib_nss3_SSL_VersionRangeSet" >&6; }
+if test "x$ac_cv_lib_nss3_SSL_VersionRangeSet" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_LIBNSS3 1
+_ACEOF
+
+  LIBS="-lnss3 $LIBS"
+
+else
+  as_fn_error $? "library 'nss3' is required for NSS" "$LINENO" 5
+fi
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for PR_GetDefaultIOMethods in -lnspr4" >&5
+$as_echo_n "checking for PR_GetDefaultIOMethods in -lnspr4... " >&6; }
+if ${ac_cv_lib_nspr4_PR_GetDefaultIOMethods+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lnspr4  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char PR_GetDefaultIOMethods ();
+int
+main ()
+{
+return PR_GetDefaultIOMethods ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_lib_nspr4_PR_GetDefaultIOMethods=yes
+else
+  ac_cv_lib_nspr4_PR_GetDefaultIOMethods=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_nspr4_PR_GetDefaultIOMethods" >&5
+$as_echo "$ac_cv_lib_nspr4_PR_GetDefaultIOMethods" >&6; }
+if test "x$ac_cv_lib_nspr4_PR_GetDefaultIOMethods" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_LIBNSPR4 1
+_ACEOF
+
+  LIBS="-lnspr4 $LIBS"
+
+else
+  as_fn_error $? "library 'nspr4' is required for NSS" "$LINENO" 5
+fi
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for SSL_GetImplementedCiphers in -lssl3" >&5
+$as_echo_n "checking for SSL_GetImplementedCiphers in -lssl3... " >&6; }
+if ${ac_cv_lib_ssl3_SSL_GetImplementedCiphers+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lssl3  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char SSL_GetImplementedCiphers ();
+int
+main ()
+{
+return SSL_GetImplementedCiphers ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_lib_ssl3_SSL_GetImplementedCiphers=yes
+else
+  ac_cv_lib_ssl3_SSL_GetImplementedCiphers=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_ssl3_SSL_GetImplementedCiphers" >&5
+$as_echo "$ac_cv_lib_ssl3_SSL_GetImplementedCiphers" >&6; }
+if test "x$ac_cv_lib_ssl3_SSL_GetImplementedCiphers" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_LIBSSL3 1
+_ACEOF
+
+  LIBS="-lssl3 $LIBS"
+
+else
+  as_fn_error $? "library 'ssl3' is required for NSS" "$LINENO" 5
+fi
+
+
+$as_echo "#define USE_NSS 1" >>confdefs.h
+
+elif test "$with_ssl" != no ; then
+  as_fn_error $? "--with-ssl must specify one of openssl or nss" "$LINENO" 5
+fi
+
+
 if test "$with_pam" = yes ; then
   { $as_echo "$as_me:${as_lineno-$LINENO}: checking for pam_start in -lpam" >&5
 $as_echo_n "checking for pam_start in -lpam... " >&6; }
@@ -13327,7 +13625,7 @@ done
 
 fi
 
-if test "$with_openssl" = yes ; then
+if test "$with_ssl" = openssl ; then
   ac_fn_c_check_header_mongrel "$LINENO" "openssl/ssl.h" "ac_cv_header_openssl_ssl_h" "$ac_includes_default"
 if test "x$ac_cv_header_openssl_ssl_h" = xyes; then :
 
@@ -13344,6 +13642,25 @@ else
 fi
 
 
+fi
+
+if test "$with_ssl" = nss ; then
+  ac_fn_c_check_header_mongrel "$LINENO" "nss/ssl.h" "ac_cv_header_nss_ssl_h" "$ac_includes_default"
+if test "x$ac_cv_header_nss_ssl_h" = xyes; then :
+
+else
+  as_fn_error $? "header file <nss/ssl.h> is required for NSS" "$LINENO" 5
+fi
+
+
+  ac_fn_c_check_header_mongrel "$LINENO" "nss/nss.h" "ac_cv_header_nss_nss_h" "$ac_includes_default"
+if test "x$ac_cv_header_nss_nss_h" = xyes; then :
+
+else
+  as_fn_error $? "header file <nss/nss.h> is required for NSS" "$LINENO" 5
+fi
+
+
 fi
 
 if test "$with_pam" = yes ; then
@@ -18061,11 +18378,13 @@ fi
 # in the template or configure command line.
 
 # If not selected manually, try to select a source automatically.
-if test x"$USE_OPENSSL_RANDOM" = x"" && test x"$USE_WIN32_RANDOM" = x"" && test x"$USE_DEV_URANDOM" = x"" ; then
-  if test x"$with_openssl" = x"yes" ; then
+if test x"$USE_OPENSSL_RANDOM" = x"" && test x"$USE_WIN32_RANDOM" = x"" && test x"$USE_DEV_URANDOM" = x"" && test x"$USE_NSS_RANDOM" = x"" ; then
+  if test x"$with_ssl" = x"openssl" ; then
     USE_OPENSSL_RANDOM=1
   elif test "$PORTNAME" = "win32" ; then
     USE_WIN32_RANDOM=1
+  elif test x"$with_ssl" = x"nss" ; then
+    USE_NSS_RANDOM=1
   else
     { $as_echo "$as_me:${as_lineno-$LINENO}: checking for /dev/urandom" >&5
 $as_echo_n "checking for /dev/urandom... " >&6; }
diff --git a/configure.ac b/configure.ac
index 5b91c83fd0..706c9862e7 100644
--- a/configure.ac
+++ b/configure.ac
@@ -852,15 +852,6 @@ PGAC_ARG_BOOL(with, bonjour, no,
 AC_MSG_RESULT([$with_bonjour])
 
 
-#
-# OpenSSL
-#
-AC_MSG_CHECKING([whether to build with OpenSSL support])
-PGAC_ARG_BOOL(with, openssl, no, [build with OpenSSL support],
-              [AC_DEFINE([USE_OPENSSL], 1, [Define to build with OpenSSL support. (--with-openssl)])])
-AC_MSG_RESULT([$with_openssl])
-AC_SUBST(with_openssl)
-
 #
 # SELinux
 #
@@ -1209,7 +1200,21 @@ if test "$with_gssapi" = yes ; then
   fi
 fi
 
+#
+# SSL Library
+#
+# There are currently two supported SSL/TLS libraries, OpenSSL and NSS.
+#
+PGAC_ARG_REQ(with, ssl, [LIB], [use LIB for SSL/TLS support (openssl, nss)])
+if test x"$with_ssl" = x"" ; then
+  with_ssl=no
+fi
+PGAC_ARG_BOOL(with, openssl, no, [obsolete spelling of --with-ssl=openssl])
 if test "$with_openssl" = yes ; then
+  with_ssl=openssl
+fi
+
+if test "$with_ssl" = openssl ; then
   dnl Order matters!
   # Minimum required OpenSSL version is 1.0.1
   AC_DEFINE(OPENSSL_API_COMPAT, [0x10001000L],
@@ -1233,7 +1238,31 @@ if test "$with_openssl" = yes ; then
   # thread-safety. In 1.1.0, it's no longer required, and CRYPTO_lock()
   # function was removed.
   AC_CHECK_FUNCS([CRYPTO_lock])
+  AC_DEFINE([USE_OPENSSL], 1, [Define to 1 if you have OpenSSL support.])
+elif test "$with_ssl" = nss ; then
+  # TODO: fallback in case nss-config/nspr-config aren't found.
+  PGAC_PATH_PROGS(NSS_CONFIG, nss-config)
+  PGAC_PATH_PROGS(NSPR_CONFIG, nspr-config)
+  if test -n "$NSS_CONFIG"; then
+    NSS_LIBS=`$NSS_CONFIG --libs`
+	NSS_CFLAGS=`$NSS_CONFIG --cflags`
+  fi
+  if test -n "$NSPR_CONFIG"; then
+	NSPR_LIBS=`$NSPR_CONFIG --libs`
+	NSPR_CFLAGS=`$NSPR_CONFIG --cflags`
+  fi
+
+  LDFLAGS="$LDFLAGS $NSS_LIBS $NSPR_LIBS"
+  CFLAGS="$CFLAGS $NSS_CFLAGS $NSPR_CFLAGS"
+
+  AC_CHECK_LIB(nss3, SSL_VersionRangeSet, [], [AC_MSG_ERROR([library 'nss3' is required for NSS])])
+  AC_CHECK_LIB(nspr4, PR_GetDefaultIOMethods, [], [AC_MSG_ERROR([library 'nspr4' is required for NSS])])
+  AC_CHECK_LIB(ssl3, SSL_GetImplementedCiphers, [], [AC_MSG_ERROR([library 'ssl3' is required for NSS])])
+  AC_DEFINE([USE_NSS], 1, [Define to 1 if you have NSS support,])
+elif test "$with_ssl" != no ; then
+  AC_MSG_ERROR([--with-ssl must specify one of openssl or nss])
 fi
+AC_SUBST(with_ssl)
 
 if test "$with_pam" = yes ; then
   AC_CHECK_LIB(pam,    pam_start, [], [AC_MSG_ERROR([library 'pam' is required for PAM])])
@@ -1405,11 +1434,16 @@ if test "$with_gssapi" = yes ; then
 	[AC_CHECK_HEADERS(gssapi.h, [], [AC_MSG_ERROR([gssapi.h header file is required for GSSAPI])])])
 fi
 
-if test "$with_openssl" = yes ; then
+if test "$with_ssl" = openssl ; then
   AC_CHECK_HEADER(openssl/ssl.h, [], [AC_MSG_ERROR([header file <openssl/ssl.h> is required for OpenSSL])])
   AC_CHECK_HEADER(openssl/err.h, [], [AC_MSG_ERROR([header file <openssl/err.h> is required for OpenSSL])])
 fi
 
+if test "$with_ssl" = nss ; then
+  AC_CHECK_HEADER(nss/ssl.h, [], [AC_MSG_ERROR([header file <nss/ssl.h> is required for NSS])])
+  AC_CHECK_HEADER(nss/nss.h, [], [AC_MSG_ERROR([header file <nss/nss.h> is required for NSS])])
+fi
+
 if test "$with_pam" = yes ; then
   AC_CHECK_HEADERS(security/pam_appl.h, [],
                    [AC_CHECK_HEADERS(pam/pam_appl.h, [],
@@ -2158,11 +2192,13 @@ fi
 # in the template or configure command line.
 
 # If not selected manually, try to select a source automatically.
-if test x"$USE_OPENSSL_RANDOM" = x"" && test x"$USE_WIN32_RANDOM" = x"" && test x"$USE_DEV_URANDOM" = x"" ; then
-  if test x"$with_openssl" = x"yes" ; then
+if test x"$USE_OPENSSL_RANDOM" = x"" && test x"$USE_WIN32_RANDOM" = x"" && test x"$USE_DEV_URANDOM" = x"" && test x"$USE_NSS_RANDOM" = x"" ; then
+  if test x"$with_ssl" = x"openssl" ; then
     USE_OPENSSL_RANDOM=1
   elif test "$PORTNAME" = "win32" ; then
     USE_WIN32_RANDOM=1
+  elif test x"$with_ssl" = x"nss" ; then
+    USE_NSS_RANDOM=1
   else
     AC_CHECK_FILE([/dev/urandom], [], [])
 
diff --git a/contrib/postgres_fdw/expected/postgres_fdw.out b/contrib/postgres_fdw/expected/postgres_fdw.out
index 2d88d06358..984efc0d7e 100644
--- a/contrib/postgres_fdw/expected/postgres_fdw.out
+++ b/contrib/postgres_fdw/expected/postgres_fdw.out
@@ -8911,7 +8911,7 @@ DO $d$
     END;
 $d$;
 ERROR:  invalid option "password"
-HINT:  Valid options in this context are: service, passfile, channel_binding, connect_timeout, dbname, host, hostaddr, port, options, application_name, keepalives, keepalives_idle, keepalives_interval, keepalives_count, tcp_user_timeout, sslmode, sslcompression, sslcert, sslkey, sslrootcert, sslcrl, requirepeer, ssl_min_protocol_version, ssl_max_protocol_version, gssencmode, krbsrvname, gsslib, target_session_attrs, use_remote_estimate, fdw_startup_cost, fdw_tuple_cost, extensions, updatable, fetch_size
+HINT:  Valid options in this context are: service, passfile, channel_binding, connect_timeout, dbname, host, hostaddr, port, options, application_name, keepalives, keepalives_idle, keepalives_interval, keepalives_count, tcp_user_timeout, sslmode, sslcompression, sslcert, sslkey, sslrootcert, sslcrl, requirepeer, ssl_min_protocol_version, ssl_max_protocol_version, gssencmode, krbsrvname, gsslib, target_session_attrs, cert_database, use_remote_estimate, fdw_startup_cost, fdw_tuple_cost, extensions, updatable, fetch_size
 CONTEXT:  SQL statement "ALTER SERVER loopback_nopw OPTIONS (ADD password 'dummypw')"
 PL/pgSQL function inline_code_block line 3 at EXECUTE
 -- If we add a password for our user mapping instead, we should get a different
diff --git a/src/Makefile.global.in b/src/Makefile.global.in
index 7ca1e9aac5..bdab2a6825 100644
--- a/src/Makefile.global.in
+++ b/src/Makefile.global.in
@@ -183,7 +183,7 @@ with_icu	= @with_icu@
 with_perl	= @with_perl@
 with_python	= @with_python@
 with_tcl	= @with_tcl@
-with_openssl	= @with_openssl@
+with_ssl	= @with_ssl@
 with_readline	= @with_readline@
 with_selinux	= @with_selinux@
 with_systemd	= @with_systemd@
diff --git a/src/backend/libpq/Makefile b/src/backend/libpq/Makefile
index efc5ef760a..045d2c2f6b 100644
--- a/src/backend/libpq/Makefile
+++ b/src/backend/libpq/Makefile
@@ -28,8 +28,12 @@ OBJS = \
 	pqmq.o \
 	pqsignal.o
 
-ifeq ($(with_openssl),yes)
+ifeq ($(with_ssl),openssl)
 OBJS += be-secure-openssl.o
+else
+ifeq ($(with_ssl),nss)
+OBJS += be-secure-nss.o
+endif
 endif
 
 ifeq ($(with_gssapi),yes)
diff --git a/src/backend/libpq/auth.c b/src/backend/libpq/auth.c
index d132c5cb48..d476101583 100644
--- a/src/backend/libpq/auth.c
+++ b/src/backend/libpq/auth.c
@@ -2870,7 +2870,14 @@ CheckCertAuth(Port *port)
 {
 	int			status_check_usermap = STATUS_ERROR;
 
+#if defined(USE_OPENSSL)
 	Assert(port->ssl);
+#elif defined(USE_NSS)
+	/* TODO: should we rename pr_fd to ssl, to keep consistency? */
+	Assert(port->pr_fd);
+#else
+	Assert(false);
+#endif
 
 	/* Make sure we have received a username in the certificate */
 	if (port->peer_cn == NULL ||
diff --git a/src/backend/libpq/be-secure-nss.c b/src/backend/libpq/be-secure-nss.c
new file mode 100644
index 0000000000..b26a4bd620
--- /dev/null
+++ b/src/backend/libpq/be-secure-nss.c
@@ -0,0 +1,1173 @@
+/*-------------------------------------------------------------------------
+ *
+ * be-secure-nss.c
+ *	  functions for supporting NSS as a TLS backend
+ *
+ *
+ * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ *	  src/backend/libpq/be-secure-nss.c
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#include "postgres.h"
+
+#include <sys/stat.h>
+
+/*
+ * BITS_PER_BYTE is also defined in the NSPR header files, so we need to undef
+ * our version to avoid compiler warnings on redefinition.
+ */
+#define pg_BITS_PER_BYTE BITS_PER_BYTE
+#undef BITS_PER_BYTE
+
+/*
+ * The nspr/obsolete/protypes.h NSPR header typedefs uint64 and int64 with
+ * colliding definitions from ours, causing a much expected compiler error.
+ * Remove backwards compatibility with ancient NSPR versions to avoid this.
+ */
+#define NO_NSPR_10_SUPPORT
+#include <nspr/nspr.h>
+#include <nspr/prerror.h>
+#include <nspr/prio.h>
+#include <nspr/prmem.h>
+#include <nspr/prtypes.h>
+
+#include <nss/nss.h>
+#include <nss/base64.h>
+#include <nss/cert.h>
+#include <nss/certdb.h>
+#include <nss/keyhi.h>
+#include <nss/pk11pub.h>
+#include <nss/secder.h>
+#include <nss/secerr.h>
+#include <nss/secitem.h>
+#include <nss/secport.h>
+#include <nss/ssl.h>
+#include <nss/sslerr.h>
+#include <nss/sslproto.h>
+
+/*
+ * Ensure that the colliding definitions match, else throw an error. In case
+ * NSPR has removed the definition for some reason, make sure to put ours
+ * back again.
+ */
+#if defined(BITS_PER_BYTE)
+#if BITS_PER_BYTE != pg_BITS_PER_BYTE
+#error "incompatible byte widths between NSPR and postgres"
+#endif
+#else
+#define BITS_PER_BYTE pg_BITS_PER_BYTE
+#endif
+#undef pg_BITS_PER_BYTE
+
+#include "common/pg_nss.h"
+#include "lib/stringinfo.h"
+#include "libpq/libpq.h"
+#include "nodes/pg_list.h"
+#include "miscadmin.h"
+#include "storage/fd.h"
+#include "utils/guc.h"
+#include "utils/memutils.h"
+
+
+/* default init hook can be overridden by a shared library */
+static void default_nss_tls_init(bool isServerStart);
+nss_tls_init_hook_type nss_tls_init_hook = default_nss_tls_init;
+
+static PRDescIdentity pr_id;
+
+static PRIOMethods pr_iomethods;
+static NSSInitContext * nss_context = NULL;
+static SSLVersionRange desired_sslver;
+
+static char *external_ssl_passphrase_cb(PK11SlotInfo *slot, PRBool retry, void *arg);
+static bool dummy_ssl_passwd_cb_called = false;
+static bool ssl_is_server_start;
+
+/*
+ * PR_ImportTCPSocket() is a private API, but very widely used, as it's the
+ * only way to make NSS use an already set up POSIX file descriptor rather
+ * than opening one itself. To quote the NSS documentation:
+ *
+ *		"In theory, code that uses PR_ImportTCPSocket may break when NSPR's
+ *		implementation changes. In practice, this is unlikely to happen because
+ *		NSPR's implementation has been stable for years and because of NSPR's
+ *		strong commitment to backward compatibility."
+ *
+ * https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSPR/Reference/PR_ImportTCPSocket
+ *
+ * The function is declared in <private/pprio.h>, but as it is a header marked
+ * private we declare it here rather than including it.
+ */
+NSPR_API(PRFileDesc *) PR_ImportTCPSocket(int);
+
+/* NSS IO layer callback overrides */
+static PRInt32 pg_ssl_read(PRFileDesc * fd, void *buf, PRInt32 amount,
+						   PRIntn flags, PRIntervalTime timeout);
+static PRInt32 pg_ssl_write(PRFileDesc * fd, const void *buf, PRInt32 amount,
+							PRIntn flags, PRIntervalTime timeout);
+/* Utility functions */
+static PRFileDesc * init_iolayer(Port *port);
+static uint16 ssl_protocol_version_to_nss(int v, const char *guc_name);
+
+static char *pg_SSLerrmessage(PRErrorCode errcode);
+static char *ssl_protocol_version_to_string(int v);
+static SECStatus pg_cert_auth_handler(void *arg, PRFileDesc * fd,
+									  PRBool checksig, PRBool isServer);
+static SECStatus pg_bad_cert_handler(void *arg, PRFileDesc * fd);
+static char *dummy_ssl_passphrase_cb(PK11SlotInfo * slot, PRBool retry, void *arg);
+
+/* ------------------------------------------------------------ */
+/*						 Public interface						*/
+/* ------------------------------------------------------------ */
+
+/*
+ * be_tls_init
+ *			Initialize the nss TLS library in the postmaster
+ *
+ * The majority of the setup needs to happen in be_tls_open_server since the
+ * NSPR initialization must happen after the forking of the backend. We could
+ * potentially move some parts in under !isServerStart, but so far this is the
+ * separation chosen.
+ */
+int
+be_tls_init(bool isServerStart)
+{
+	SECStatus	status;
+	SSLVersionRange supported_sslver;
+
+	/*
+	 * Set up the connection cache for multi-processing application behavior.
+	 * If we are in ServerStart then we initialize the cache. If the server is
+	 * already started, we inherit the cache such that it can be used for
+	 * connections. Calling SSL_ConfigMPServerSIDCache sets an environment
+	 * variable which contains enough information for the forked child to know
+	 * how to access it.  Passing NULL to SSL_InheritMPServerSIDCache will
+	 * make the forked child look it up by the default name SSL_INHERITANCE,
+	 * if env vars aren't inherited then the contents of the variable can be
+	 * passed instead.
+	 */
+	if (isServerStart)
+	{
+		/*
+		 * SSLv2 and SSLv3 are disabled in this TLS backend, but when setting
+		 * up the required session cache for NSS we still must supply timeout
+		 * values for v2 and The minimum allowed value for both is 5 seconds,
+		 * so opt for that in both cases (the defaults being 100 seconds and
+		 * 24 hours).
+		 *
+		 * Passing NULL as the directory for the session cache will default to
+		 * using /tmp on UNIX and \\temp on Windows.  Deciding if we want to
+		 * keep closer control on this directory is left as a TODO.
+		 */
+		status = SSL_ConfigMPServerSIDCache(MaxConnections, 5, 5, NULL);
+		if (status != SECSuccess)
+			ereport(FATAL,
+					(errmsg("unable to set up TLS connection cache: %s",
+							pg_SSLerrmessage(PR_GetError()))));
+
+	}
+	else
+	{
+		status = SSL_InheritMPServerSIDCache(NULL);
+		if (status != SECSuccess)
+		{
+			ereport(LOG,
+					(errmsg("unable to connect to TLS connection cache: %s",
+							pg_SSLerrmessage(PR_GetError()))));
+			return -1;
+		}
+	}
+
+	if (!ssl_database || strlen(ssl_database) == 0)
+	{
+		ereport(isServerStart ? FATAL : LOG,
+				(errmsg("no certificate database specified")));
+		goto error;
+	}
+
+	/*
+	 * We check for the desired TLS version range here, even though we cannot
+	 * set it until be_open_server such that we can be compatible with how the
+	 * OpenSSL backend reports errors for incompatible range configurations.
+	 * Set either the default supported TLS version range, or the configured
+	 * range from ssl_min_protocol_version and ssl_max_protocol version. In
+	 * case the user hasn't defined the maximum allowed version we fall back
+	 * to the highest version TLS that the library supports.
+	 */
+	if (SSL_VersionRangeGetSupported(ssl_variant_stream, &supported_sslver) != SECSuccess)
+	{
+		ereport(isServerStart ? FATAL : LOG,
+				(errmsg("unable to get default protocol support from NSS")));
+		goto error;
+	}
+
+	/*
+	 * Set the fallback versions for the TLS protocol version range to a
+	 * combination of our minimal requirement and the library maximum.
+	 */
+	desired_sslver.min = SSL_LIBRARY_VERSION_TLS_1_0;
+	desired_sslver.max = supported_sslver.max;
+
+	if (ssl_min_protocol_version)
+	{
+		int			ver = ssl_protocol_version_to_nss(ssl_min_protocol_version,
+													  "ssl_min_protocol_version");
+
+		if (ver == -1)
+		{
+			ereport(isServerStart ? FATAL : LOG,
+					(errmsg("\"%s\" setting \"%s\" not supported by this build",
+							"ssl_min_protocol_version",
+							GetConfigOption("ssl_min_protocol_version",
+											false, false))));
+			goto error;
+		}
+
+		if (ver > 0)
+			desired_sslver.min = ver;
+	}
+
+	if (ssl_max_protocol_version)
+	{
+		int			ver = ssl_protocol_version_to_nss(ssl_max_protocol_version,
+													  "ssl_max_protocol_version");
+
+		if (ver == -1)
+		{
+			ereport(isServerStart ? FATAL : LOG,
+					(errmsg("\"%s\" setting \"%s\" not supported by this build",
+							"ssl_max_protocol_version",
+							GetConfigOption("ssl_max_protocol_version",
+											false, false))));
+			goto error;
+		}
+		if (ver > 0)
+			desired_sslver.max = ver;
+
+		if (ver < desired_sslver.min)
+		{
+			ereport(isServerStart ? FATAL : LOG,
+					(errmsg("could not set SSL protocol version range"),
+					 errdetail("\"%s\" cannot be higher than \"%s\"",
+							   "ssl_min_protocol_version",
+							   "ssl_max_protocol_version")));
+			goto error;
+		}
+	}
+
+	/*
+	 * Set the passphrase callback which will be used both to obtain the
+	 * passphrase from the user, as well as by NSS to obtain the phrase
+	 * repeatedly.
+	 */
+	ssl_is_server_start = isServerStart;
+	(*nss_tls_init_hook) (isServerStart);
+
+	return 0;
+error:
+	return -1;
+}
+
+int
+be_tls_open_server(Port *port)
+{
+	SECStatus	status;
+	PRFileDesc *model;
+	PRFileDesc *pr_fd;
+	PRFileDesc *layer;
+	CERTCertificate *server_cert;
+	SECKEYPrivateKey *private_key;
+	CERTSignedCrl *crl;
+	SECItem		crlname;
+	char	   *cert_database;
+	NSSInitParameters params;
+
+	/*
+	 * The NSPR documentation states that runtime initialization via PR_Init
+	 * is no longer required, as the first caller into NSPR will perform the
+	 * initialization implicitly. The documentation doesn't however clarify
+	 * from which version this is holds true, so let's perform the potentially
+	 * superfluous initialization anyways to avoid crashing on older versions
+	 * of NSPR, as there is no difference in overhead.  The NSS documentation
+	 * still states that PR_Init must be called in some way (implicitly or
+	 * explicitly).
+	 *
+	 * The below parameters are what the implicit initialization would've done
+	 * for us, and should work even for older versions where it might not be
+	 * done automatically. The last parameter, maxPTDs, is set to various
+	 * values in other codebases, but has been unused since NSPR 2.1 which was
+	 * released sometime in 1998. In current versions of NSPR all parameters
+	 * are ignored.
+	 */
+	PR_Init(PR_USER_THREAD, PR_PRIORITY_NORMAL, 0 /* maxPTDs */ );
+
+	/*
+	 * The certificate path (configdir) must contain a valid NSS database. If
+	 * the certificate path isn't a valid directory, NSS will fall back on the
+	 * system certificate database. If the certificate path is a directory but
+	 * is empty then the initialization will fail. On the client side this can
+	 * be allowed for any sslmode but the verify-xxx ones.
+	 * https://bugzilla.redhat.com/show_bug.cgi?id=728562 For the server side
+	 * we wont allow this to fail however, as we require the certificate and
+	 * key to exist.
+	 *
+	 * The original design of NSS was for a single application to use a single
+	 * copy of it, initialized with NSS_Initialize() which isn't returning any
+	 * handle with which to refer to NSS. NSS initialization and shutdown are
+	 * global for the application, so a shutdown in another NSS enabled
+	 * library would cause NSS to be stopped for libpq as well.  The fix has
+	 * been to introduce NSS_InitContext which returns a context handle to
+	 * pass to NSS_ShutdownContext.  NSS_InitContext was introduced in NSS
+	 * 3.12, but the use of it is not very well documented.
+	 * https://bugzilla.redhat.com/show_bug.cgi?id=738456
+	 *
+	 * The InitParameters struct passed can be used to override internal
+	 * values in NSS, but the usage is not documented at all. When using
+	 * NSS_Init initializations, the values are instead set via PK11_Configure
+	 * calls so the PK11_Configure documentation can be used to glean some
+	 * details on these.
+	 *
+	 * https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS/PKCS11/Module_Specs
+	 */
+	memset(&params, '\0', sizeof(params));
+	params.length = sizeof(params);
+
+	if (!ssl_database || strlen(ssl_database) == 0)
+		ereport(FATAL,
+				(errmsg("no certificate database specified")));
+
+	cert_database = psprintf("sql:%s", ssl_database);
+	nss_context = NSS_InitContext(cert_database, "", "", "",
+								  &params,
+								  NSS_INIT_READONLY | NSS_INIT_PK11RELOAD);
+	pfree(cert_database);
+
+	if (!nss_context)
+		ereport(FATAL,
+				(errmsg("unable to read certificate database \"%s\": %s",
+						ssl_database, pg_SSLerrmessage(PR_GetError()))));
+
+	/*
+	 * Import the already opened socket as we don't want to use NSPR functions
+	 * for opening the network socket due to how the PostgreSQL protocol works
+	 * with TLS connections. This function is not part of the NSPR public API,
+	 * see the comment at the top of the file for the rationale of still using
+	 * it.
+	 */
+	pr_fd = PR_ImportTCPSocket(port->sock);
+	if (!pr_fd)
+		ereport(ERROR,
+				(errmsg("unable to connect to socket")));
+
+	/*
+	 * Most of the documentation available, and implementations of, NSS/NSPR
+	 * use the PR_NewTCPSocket() function here, which has the drawback that it
+	 * can only create IPv4 sockets. Instead use PR_OpenTCPSocket() which
+	 * copes with IPv6 as well.
+	 *
+	 * We use a model filedescriptor here which is a construct in NSPR/NSS in
+	 * order to create a configuration template for sockets which can then be
+	 * applied to new sockets created. This makes more sense in a server which
+	 * accepts multiple connections and want to perform the boilerplate just
+	 * once, but it does provide a nice abstraction here aswell in that we can
+	 * error out early without having performed any operation on the real
+	 * socket.
+	 */
+	model = PR_OpenTCPSocket(port->laddr.addr.ss_family);
+	if (!model)
+		ereport(ERROR,
+				(errmsg("unable to open socket")));
+
+	/*
+	 * Convert the NSPR socket to an SSL socket. Ensuring the success of this
+	 * operation is critical as NSS SSL_* functions may return SECSuccess on
+	 * the socket even though SSL hasn't been enabled, which introduce a risk
+	 * of silent downgrades.
+	 */
+	model = SSL_ImportFD(NULL, model);
+	if (!model)
+		ereport(ERROR,
+				(errmsg("unable to enable TLS on socket")));
+
+	/*
+	 * Configure basic settings for the connection over the SSL socket in
+	 * order to set it up as a server.
+	 */
+	if (SSL_OptionSet(model, SSL_SECURITY, PR_TRUE) != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to configure TLS connection")));
+
+	if (SSL_OptionSet(model, SSL_HANDSHAKE_AS_SERVER, PR_TRUE) != SECSuccess ||
+		SSL_OptionSet(model, SSL_HANDSHAKE_AS_CLIENT, PR_FALSE) != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to configure TLS connection as server")));
+
+	/*
+	 * SSLv2 is disabled by default, and SSLv3 will be excluded from the range
+	 * of allowed protocols further down. Since we really don't want these to
+	 * ever be enabled, let's use belts and suspenders and explicitly turn
+	 * them off as well.
+	 */
+	SSL_OptionSet(model, SSL_ENABLE_SSL2, PR_FALSE);
+	SSL_OptionSet(model, SSL_ENABLE_SSL3, PR_FALSE);
+
+#ifdef SSL_CBC_RANDOM_IV
+
+	/*
+	 * Enable protection against the BEAST attack in case the NSS server has
+	 * support for that. While SSLv3 is disabled, we may still allow TLSv1
+	 * which is affected. The option isn't documented as an SSL option, but as
+	 * an NSS environment variable.
+	 */
+	SSL_OptionSet(model, SSL_CBC_RANDOM_IV, PR_TRUE);
+#endif
+
+	/*
+	 * Configure the allowed ciphers. If there are no user preferred suites,
+	 * set the domestic policy.
+	 *
+	 * Historically there were different cipher policies based on export (and
+	 * import) restrictions: Domestic, Export and France. These are since long
+	 * removed with all ciphers being enabled by default. Due to backwards
+	 * compatibility, the old API is still used even though all three policies
+	 * now do the same thing.
+	 *
+	 * If SSLCipherSuites define a policy of the user, we set that rather than
+	 * enabling all ciphers via NSS_SetDomesticPolicy.
+	 *
+	 * TODO: while this code works, the set of ciphers which can be set and
+	 * still end up with a working socket is woefully underdocumented for
+	 * anything more recent than SSLv3 (the code for TLS actually calls ssl3
+	 * functions under the hood for SSL_CipherPrefSet), so it's unclear if this
+	 * is helpful or not. Using the policies works, but may be too coarsely
+	 * grained.
+	 *
+	 * Another TODO: The SSL_ImplementedCiphers table returned with calling
+	 * SSL_GetImplementedCiphers is sorted in server preference order. Sorting
+	 * SSLCipherSuites according to the order of the ciphers therein could be
+	 * a way to implement ssl_prefer_server_ciphers - if we at all want to use
+	 * cipher selection for NSS like how we do it for OpenSSL that is.
+	 */
+
+	/*
+	 * If no ciphers are specified, enable them all.
+	 */
+	if (!SSLCipherSuites || strlen(SSLCipherSuites) == 0)
+	{
+		status = NSS_SetDomesticPolicy();
+		if (status != SECSuccess)
+			ereport(ERROR,
+					(errmsg("unable to set cipher policy: %s",
+							pg_SSLerrmessage(PR_GetError()))));
+	}
+	else
+	{
+		char	   *ciphers,
+				   *c;
+
+		char	   *sep = ":;, ";
+		PRUint16	ciphercode;
+		const		PRUint16 *nss_ciphers;
+
+		/*
+		 * If the user has specified a set of preferred cipher suites we start
+		 * by turning off all the existing suites to avoid the risk of down-
+		 * grades to a weaker cipher than expected.
+		 */
+		nss_ciphers = SSL_GetImplementedCiphers();
+		for (int i = 0; i < SSL_GetNumImplementedCiphers(); i++)
+			SSL_CipherPrefSet(model, nss_ciphers[i], PR_FALSE);
+
+		ciphers = pstrdup(SSLCipherSuites);
+
+		for (c = strtok(ciphers, sep); c; c = strtok(NULL, sep))
+		{
+			ciphercode = pg_find_cipher(c);
+			if (ciphercode != INVALID_CIPHER)
+			{
+				status = SSL_CipherPrefSet(model, ciphercode, PR_TRUE);
+				if (status != SECSuccess)
+					ereport(ERROR,
+							(errmsg("invalid cipher-suite specified: %s", c)));
+			}
+		}
+
+		pfree(ciphers);
+	}
+
+	if (SSL_VersionRangeSet(model, &desired_sslver) != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to set requested SSL protocol version range")));
+
+	/*
+	 * Set up the custom IO layer.
+	 */
+	layer = init_iolayer(port);
+	if (!layer)
+		goto error;
+
+	/* Store the Port as private data available in callbacks */
+	layer->secret = (void *) port;
+
+	if (PR_PushIOLayer(pr_fd, PR_TOP_IO_LAYER, layer) != PR_SUCCESS)
+	{
+		PR_Close(layer);
+		ereport(ERROR,
+				(errmsg("unable to push IO layer")));
+	}
+
+	server_cert = PK11_FindCertFromNickname(ssl_cert_file, (void *) port);
+	if (!server_cert)
+	{
+		if (dummy_ssl_passwd_cb_called)
+			ereport(ERROR,
+					(errmsg("unable to load certificate for \"%s\": %s",
+							ssl_cert_file, pg_SSLerrmessage(PR_GetError())),
+					 errhint("The certificate requires a password.")));
+		else
+			ereport(ERROR,
+					(errmsg("unable to find certificate for \"%s\": %s",
+							ssl_cert_file, pg_SSLerrmessage(PR_GetError()))));
+	}
+
+	private_key = PK11_FindKeyByAnyCert(server_cert, (void *) port);
+	if (!private_key)
+	{
+		if (dummy_ssl_passwd_cb_called)
+			ereport(ERROR,
+					(errmsg("unable to load private key for \"%s\": %s",
+							ssl_cert_file, pg_SSLerrmessage(PR_GetError())),
+					 errhint("The private key requires a password.")));
+		else
+			ereport(ERROR,
+					(errmsg("unable to find private key for \"%s\": %s",
+							ssl_cert_file, pg_SSLerrmessage(PR_GetError()))));
+	}
+
+	/*
+	 * NSS doesn't use CRL files on disk, so we use the ssl_crl_file guc to
+	 * contain the CRL nickname for the current server certificate in the NSS
+	 * certificate database. The main difference from the OpenSSL backend is
+	 * that NSS will use the CRL regardless, but being able to make sure the
+	 * CRL is loaded seems like a good feature.
+	 */
+	if (ssl_crl_file[0])
+	{
+		SECITEM_CopyItem(NULL, &crlname, &server_cert->derSubject);
+		crl = SEC_FindCrlByName(CERT_GetDefaultCertDB(), &crlname, SEC_CRL_TYPE);
+		if (!crl)
+			ereport(ERROR,
+					(errmsg("specified CRL not found in database")));
+		SEC_DestroyCrl(crl);
+	}
+
+	/*
+	 * Finally we must configure the socket for being a server by setting the
+	 * certificate and key. The NULL parameter is an SSLExtraServerCertData
+	 * pointer with the final parameter being the size of the extra server
+	 * cert data structure pointed to. This is typically only used for
+	 * credential delegation.
+	 */
+	status = SSL_ConfigServerCert(model, server_cert, private_key, NULL, 0);
+	if (status != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to configure server for TLS server connections: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+
+	ssl_loaded_verify_locations = true;
+
+	/*
+	 * At this point, we no longer have use for the certificate and private
+	 * key as they have been copied into the context by NSS. Destroy our
+	 * copies explicitly to clean out the memory as best we can.
+	 */
+	CERT_DestroyCertificate(server_cert);
+	SECKEY_DestroyPrivateKey(private_key);
+
+	status = SSL_AuthCertificateHook(model, pg_cert_auth_handler, (void *) port);
+	if (status != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to install authcert hook: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+	SSL_BadCertHook(model, pg_bad_cert_handler, (void *) port);
+	SSL_OptionSet(model, SSL_REQUEST_CERTIFICATE, PR_TRUE);
+	SSL_OptionSet(model, SSL_REQUIRE_CERTIFICATE, PR_FALSE);
+
+	port->pr_fd = SSL_ImportFD(model, pr_fd);
+	if (!port->pr_fd)
+		ereport(ERROR,
+				(errmsg("unable to initialize")));
+
+	PR_Close(model);
+
+	/*
+	 * Force a handshake on the next I/O request, the second parameter means
+	 * that we are a server, PR_FALSE would indicate being a client. NSPR
+	 * requires us to call SSL_ResetHandshake since we imported an already
+	 * established socket.
+	 */
+	status = SSL_ResetHandshake(port->pr_fd, PR_TRUE);
+	if (status != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to initiate handshake: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+	status = SSL_ForceHandshake(port->pr_fd);
+	if (status != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to handshake: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+
+	port->ssl_in_use = true;
+	return 0;
+
+error:
+	return 1;
+}
+
+ssize_t
+be_tls_read(Port *port, void *ptr, size_t len, int *waitfor)
+{
+	ssize_t		n_read;
+	PRErrorCode err;
+
+	n_read = PR_Read(port->pr_fd, ptr, len);
+
+	if (n_read < 0)
+	{
+		err = PR_GetError();
+
+		if (err == PR_WOULD_BLOCK_ERROR)
+		{
+			*waitfor = WL_SOCKET_READABLE;
+			errno = EWOULDBLOCK;
+		}
+		else
+			errno = ECONNRESET;
+	}
+
+	return n_read;
+}
+
+ssize_t
+be_tls_write(Port *port, void *ptr, size_t len, int *waitfor)
+{
+	ssize_t		n_write;
+	PRErrorCode err;
+	PRIntn		flags = 0;
+
+	/*
+	 * The flags parameter to PR_Send is no longer used and is, according to
+	 * the documentation, required to be zero.
+	 */
+	n_write = PR_Send(port->pr_fd, ptr, len, flags, PR_INTERVAL_NO_WAIT);
+
+	if (n_write < 0)
+	{
+		err = PR_GetError();
+
+		if (err == PR_WOULD_BLOCK_ERROR)
+		{
+			*waitfor = WL_SOCKET_WRITEABLE;
+			errno = EWOULDBLOCK;
+		}
+		else
+			errno = ECONNRESET;
+	}
+
+	return n_write;
+}
+
+void
+be_tls_close(Port *port)
+{
+	if (!port)
+		return;
+
+	if (port->peer_cn)
+	{
+		SSL_InvalidateSession(port->pr_fd);
+		pfree(port->peer_cn);
+		port->peer_cn = NULL;
+	}
+
+	PR_Close(port->pr_fd);
+	port->pr_fd = NULL;
+	port->ssl_in_use = false;
+
+	if (nss_context)
+	{
+		NSS_ShutdownContext(nss_context);
+		nss_context = NULL;
+	}
+}
+
+void
+be_tls_destroy(void)
+{
+	/*
+	 * It reads a bit odd to clear a session cache when we are destroying the
+	 * context altogether, but if the session cache isn't cleared before
+	 * shutting down the context it will fail with SEC_ERROR_BUSY.
+	 */
+	SSL_ClearSessionCache();
+}
+
+int
+be_tls_get_cipher_bits(Port *port)
+{
+	SECStatus	status;
+	SSLChannelInfo channel;
+	SSLCipherSuiteInfo suite;
+
+	status = SSL_GetChannelInfo(port->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+		goto error;
+
+	status = SSL_GetCipherSuiteInfo(channel.cipherSuite, &suite, sizeof(suite));
+	if (status != SECSuccess)
+		goto error;
+
+	return suite.effectiveKeyBits;
+
+error:
+	ereport(WARNING,
+			(errmsg("unable to extract TLS session information: %s",
+					pg_SSLerrmessage(PR_GetError()))));
+	return 0;
+}
+
+/*
+ * be_tls_get_compression
+ *
+ * NSS disabled support for TLS compression in version 3.33 and removed the
+ * code in a subsequent release. The API for retrieving information about
+ * compression as well as enabling it is kept for backwards compatibility, but
+ * we don't need to consult it since it was only available for SSLv3 which we
+ * don't support.
+ *
+ * https://bugzilla.mozilla.org/show_bug.cgi?id=1409587
+ */
+bool
+be_tls_get_compression(Port *port)
+{
+	return false;
+}
+
+/*
+ * be_tls_get_version
+ *
+ * Returns the protocol version used for the current connection, or NULL in
+ * case of errors.
+ */
+const char *
+be_tls_get_version(Port *port)
+{
+	SECStatus	status;
+	SSLChannelInfo channel;
+
+	status = SSL_GetChannelInfo(port->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+	{
+		ereport(WARNING,
+				(errmsg("unable to extract TLS session information: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+		return NULL;
+	}
+
+	return ssl_protocol_version_to_string(channel.protocolVersion);
+}
+
+const char *
+be_tls_get_cipher(Port *port)
+{
+	SECStatus	status;
+	SSLChannelInfo channel;
+	SSLCipherSuiteInfo suite;
+
+	status = SSL_GetChannelInfo(port->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+		goto error;
+
+	status = SSL_GetCipherSuiteInfo(channel.cipherSuite, &suite, sizeof(suite));
+	if (status != SECSuccess)
+		goto error;
+
+	return suite.cipherSuiteName;
+
+error:
+	ereport(WARNING,
+			(errmsg("unable to extract TLS session information: %s",
+					pg_SSLerrmessage(PR_GetError()))));
+	return NULL;
+}
+
+void
+be_tls_get_peer_subject_name(Port *port, char *ptr, size_t len)
+{
+	CERTCertificate *certificate;
+
+	certificate = SSL_PeerCertificate(port->pr_fd);
+	if (certificate)
+		strlcpy(ptr, CERT_NameToAscii(&certificate->subject), len);
+	else
+		ptr[0] = '\0';
+}
+
+void
+be_tls_get_peer_issuer_name(Port *port, char *ptr, size_t len)
+{
+	CERTCertificate *certificate;
+
+	certificate = SSL_PeerCertificate(port->pr_fd);
+	if (certificate)
+		strlcpy(ptr, CERT_NameToAscii(&certificate->issuer), len);
+	else
+		ptr[0] = '\0';
+}
+
+void
+be_tls_get_peer_serial(Port *port, char *ptr, size_t len)
+{
+	CERTCertificate *certificate;
+
+	certificate = SSL_PeerCertificate(port->pr_fd);
+	if (certificate)
+		snprintf(ptr, len, "%li", DER_GetInteger(&(certificate->serialNumber)));
+	else
+		ptr[0] = '\0';
+}
+
+/* ------------------------------------------------------------ */
+/*						Internal functions						*/
+/* ------------------------------------------------------------ */
+
+/*
+ * default_nss_tls_init
+ *
+ * The default TLS init hook function which users can override for installing
+ * their own passphrase callbacks and similar actions. In case no callback has
+ * been configured, or the callback isn't reload capable during a server
+ * reload, the dummy callback will be installed.
+ *
+ * The private data for the callback is set differently depending on how it's
+ * invoked. For calls which may invoke the callback deeper in the callstack
+ * the private data is set with SSL_SetPKCS11PinArg. When the call is directly
+ * invoking the callback, like PK11_FindCertFromNickname, then the private
+ * data is passed as a parameter. Setting the data with SSL_SetPKCS11PinArg is
+ * thus not required but good practice.
+ *
+ * NSS doesn't provide a default callback like OpenSSL does, but a callback is
+ * required to be set.  The password callback can be installed at any time, but
+ * setting the private data with SSL_SetPKCS11PinArg requires a PR Filedesc.
+ */
+static void
+default_nss_tls_init(bool isServerStart)
+{
+	/*
+	 * No user-defined callback has been configured, install the dummy call-
+	 * back since we must set something.
+	 */
+	if (!ssl_passphrase_command[0])
+		PK11_SetPasswordFunc(dummy_ssl_passphrase_cb);
+	else
+	{
+		/*
+		 * There is a user-defined callback, set it unless we are in a restart
+		 * and cannot handle restarts due to an interactive callback.
+		 */
+		if (isServerStart)
+			PK11_SetPasswordFunc(external_ssl_passphrase_cb);
+		else
+		{
+			if (ssl_passphrase_command_supports_reload)
+				PK11_SetPasswordFunc(external_ssl_passphrase_cb);
+			else
+				PK11_SetPasswordFunc(dummy_ssl_passphrase_cb);
+		}
+	}
+}
+
+/*
+ * external_ssl_passphrase_cb
+ *
+ * Runs the callback configured by ssl_passphrase_command and returns the
+ * captured password back to NSS.
+ */
+static char *
+external_ssl_passphrase_cb(PK11SlotInfo *slot, PRBool retry, void *arg)
+{
+	/*
+	 * NSS use a hardcoded 256 byte buffer for reading the password so set the
+	 * same limit for our callback buffer.
+	 */
+	char		buf[256];
+	int			len;
+	char	   *password = NULL;
+	char	   *prompt;
+
+	/*
+	 * Since there is no password callback in NSS when the server starts up,
+	 * it makes little sense to create an interactive callback. Thus, if this
+	 * is a retry attempt then give up immediately.
+	 */
+	if (retry)
+		return NULL;
+
+	/*
+	 * Construct the same prompt that NSS uses internally even though it is
+	 * unlikely to serve much purpose, but we must set a prompt so we might
+	 * as well do it right.
+	 */
+	prompt = psprintf("Enter Password or Pin for \"%s\":",
+					  PK11_GetTokenName(slot));
+
+	len = run_ssl_passphrase_command(prompt, ssl_is_server_start, buf, sizeof(buf));
+	pfree(prompt);
+
+	if (!len)
+		return NULL;
+
+	/*
+	 * At least one byte with password content was returned, and NSS requires
+	 * that we return it allocated in NSS controlled memory. If we fail to
+	 * allocate then abort without passing back NULL and bubble up the error
+	 * on the PG side.
+	 */
+	password = (char *) PR_Malloc(len + 1);
+	if (!password)
+	{
+		explicit_bzero(buf, sizeof(buf));
+		ereport(ERROR,
+				(errcode(ERRCODE_OUT_OF_MEMORY),
+				 errmsg("out of memory")));
+	}
+	strlcpy(password, buf, sizeof(password));
+	explicit_bzero(buf, sizeof(buf));
+
+	return password;
+}
+
+/*
+ * dummy_ssl_passphrase_cb
+ *
+ * Return unsuccessful if we are asked to provide the passphrase for a cert or
+ * key, without having a passphrase callback installed.
+ */
+static char *
+dummy_ssl_passphrase_cb(PK11SlotInfo *slot, PRBool retry, void *arg)
+{
+	dummy_ssl_passwd_cb_called = true;
+	return NULL;
+}
+
+static SECStatus
+pg_bad_cert_handler(void *arg, PRFileDesc * fd)
+{
+	Port	   *port = (Port *) arg;
+
+	port->peer_cert_valid = false;
+	return SECFailure;
+}
+
+static SECStatus
+pg_cert_auth_handler(void *arg, PRFileDesc * fd, PRBool checksig, PRBool isServer)
+{
+	SECStatus	status;
+	Port	   *port = (Port *) arg;
+	CERTCertificate *cert;
+	char	   *peer_cn;
+	int			len;
+
+	status = SSL_AuthCertificate(CERT_GetDefaultCertDB(), port->pr_fd, checksig, PR_TRUE);
+	if (status == SECSuccess)
+	{
+		cert = SSL_PeerCertificate(port->pr_fd);
+		len = strlen(cert->subjectName);
+		peer_cn = MemoryContextAllocZero(TopMemoryContext, len + 1);
+		/*
+		 * Skip over the key= portion of the key=value containing the the
+		 * peer CN.
+		 */
+		if (strncmp(cert->subjectName, "CN=", 3) == 0)
+			strlcpy(peer_cn, cert->subjectName + strlen("CN="), len + 1);
+		else
+			strlcpy(peer_cn, cert->subjectName, len + 1);
+		CERT_DestroyCertificate(cert);
+
+		port->peer_cn = peer_cn;
+		port->peer_cert_valid = true;
+	}
+
+	return status;
+}
+
+static PRInt32
+pg_ssl_read(PRFileDesc *fd, void *buf, PRInt32 amount, PRIntn flags,
+			PRIntervalTime timeout)
+{
+	PRRecvFN	read_fn;
+	PRInt32		n_read;
+
+	read_fn = fd->lower->methods->recv;
+	n_read = read_fn(fd->lower, buf, amount, flags, timeout);
+
+	return n_read;
+}
+
+static PRInt32
+pg_ssl_write(PRFileDesc *fd, const void *buf, PRInt32 amount, PRIntn flags,
+			 PRIntervalTime timeout)
+{
+	PRSendFN	send_fn;
+	PRInt32		n_write;
+
+	send_fn = fd->lower->methods->send;
+	n_write = send_fn(fd->lower, buf, amount, flags, timeout);
+
+	return n_write;
+}
+
+static PRFileDesc *
+init_iolayer(Port *port)
+{
+	const		PRIOMethods *default_methods;
+	PRFileDesc *layer;
+
+	/*
+	 * Start by initializing our layer with all the default methods so that we
+	 * can selectively override the ones we want while still ensuring that we
+	 * have a complete layer specification.
+	 */
+	default_methods = PR_GetDefaultIOMethods();
+	memcpy(&pr_iomethods, default_methods, sizeof(PRIOMethods));
+
+	pr_iomethods.recv = pg_ssl_read;
+	pr_iomethods.send = pg_ssl_write;
+
+	/*
+	 * Each IO layer must be identified by a unique name, where uniqueness is
+	 * per connection. Each connection in a postgres cluster can generate the
+	 * identity from the same string as they will create their IO layers on
+	 * different sockets. Only one layer per socket can have the same name.
+	 */
+	pr_id = PR_GetUniqueIdentity("PostgreSQL Server");
+	if (pr_id == PR_INVALID_IO_LAYER)
+	{
+		ereport(ERROR,
+				(errmsg("out of memory when setting up TLS connection")));
+		return NULL;
+	}
+
+	/*
+	 * Create the actual IO layer as a stub such that it can be pushed onto
+	 * the layer stack. The step via a stub is required as we define custom
+	 * callbacks.
+	 */
+	layer = PR_CreateIOLayerStub(pr_id, &pr_iomethods);
+	if (!layer)
+	{
+		ereport(ERROR,
+				(errmsg("unable to create NSS I/O layer")));
+		return NULL;
+	}
+
+	return layer;
+}
+
+static char *
+ssl_protocol_version_to_string(int v)
+{
+	switch (v)
+	{
+			/* SSL v2 and v3 are not supported */
+		case SSL_LIBRARY_VERSION_2:
+		case SSL_LIBRARY_VERSION_3_0:
+			Assert(false);
+			break;
+
+		case SSL_LIBRARY_VERSION_TLS_1_0:
+			return pstrdup("TLSv1.0");
+		case SSL_LIBRARY_VERSION_TLS_1_1:
+			return pstrdup("TLSv1.1");
+		case SSL_LIBRARY_VERSION_TLS_1_2:
+			return pstrdup("TLSv1.2");
+		case SSL_LIBRARY_VERSION_TLS_1_3:
+			return pstrdup("TLSv1.3");
+	}
+
+	return pstrdup("unknown");
+}
+
+
+/*
+ * ssl_protocol_version_to_nss
+ *			Translate PostgreSQL TLS version to NSS version
+ *
+ * Returns zero in case the requested TLS version is undefined (PG_ANY) and
+ * should be set by the caller, or -1 on failure.
+ */
+static uint16
+ssl_protocol_version_to_nss(int v, const char *guc_name)
+{
+	switch (v)
+	{
+			/*
+			 * There is no SSL_LIBRARY_ macro defined in NSS with the value
+			 * zero, so we use this to signal the caller that the highest
+			 * useful version should be set on the connection.
+			 */
+		case PG_TLS_ANY:
+			return 0;
+
+			/*
+			 * No guard is required here as there are no versions of NSS
+			 * without support for TLS1.
+			 */
+		case PG_TLS1_VERSION:
+			return SSL_LIBRARY_VERSION_TLS_1_0;
+		case PG_TLS1_1_VERSION:
+#ifdef SSL_LIBRARY_VERSION_TLS_1_1
+			return SSL_LIBRARY_VERSION_TLS_1_1;
+#else
+			break;
+#endif
+		case PG_TLS1_2_VERSION:
+#ifdef SSL_LIBRARY_VERSION_TLS_1_2
+			return SSL_LIBRARY_VERSION_TLS_1_2;
+#else
+			break;
+#endif
+		case PG_TLS1_3_VERSION:
+#ifdef SSL_LIBRARY_VERSION_TLS_1_3
+			return SSL_LIBRARY_VERSION_TLS_1_3;
+#else
+			break;
+#endif
+		default:
+			break;
+	}
+
+	return -1;
+}
+
+/*
+ * pg_SSLerrmessage
+ *		Create and return a human readable error message given
+ *		the specified error code
+ *
+ * PR_ErrorToName only converts the enum identifier of the error to string,
+ * but that can be quite useful for debugging (and in case PR_ErrorToString is
+ * unable to render a message then we at least have something).
+ */
+static char *
+pg_SSLerrmessage(PRErrorCode errcode)
+{
+	return psprintf("%s (%s)",
+					PR_ErrorToString(errcode, PR_LANGUAGE_I_DEFAULT),
+					PR_ErrorToName(errcode));
+}
diff --git a/src/backend/libpq/be-secure.c b/src/backend/libpq/be-secure.c
index 2ae507a902..f39977b80c 100644
--- a/src/backend/libpq/be-secure.c
+++ b/src/backend/libpq/be-secure.c
@@ -49,6 +49,9 @@ bool		ssl_passphrase_command_supports_reload;
 #ifdef USE_SSL
 bool		ssl_loaded_verify_locations = false;
 #endif
+#ifdef USE_NSS
+char	   *ssl_database;
+#endif
 
 /* GUC variable controlling SSL cipher list */
 char	   *SSLCipherSuites = NULL;
diff --git a/src/backend/libpq/hba.c b/src/backend/libpq/hba.c
index 4c86fb6087..8821c60a34 100644
--- a/src/backend/libpq/hba.c
+++ b/src/backend/libpq/hba.c
@@ -1040,7 +1040,7 @@ parse_hba_line(TokenizedLine *tok_line, int elevel)
 			ereport(elevel,
 					(errcode(ERRCODE_CONFIG_FILE_ERROR),
 					 errmsg("hostssl record cannot match because SSL is not supported by this build"),
-					 errhint("Compile with --with-openssl to use SSL connections."),
+					 errhint("Compile with --with-openssl or --with-nss to use SSL connections."),
 					 errcontext("line %d of configuration file \"%s\"",
 								line_num, HbaFileName)));
 			*err_msg = "hostssl record cannot match because SSL is not supported by this build";
diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c
index a62d64eaa4..050f673c68 100644
--- a/src/backend/utils/misc/guc.c
+++ b/src/backend/utils/misc/guc.c
@@ -4262,7 +4262,11 @@ static struct config_string ConfigureNamesString[] =
 		},
 		&ssl_library,
 #ifdef USE_SSL
+#if defined(USE_OPENSSL)
 		"OpenSSL",
+#elif defined(USE_NSS)
+		"NSS",
+#endif
 #else
 		"",
 #endif
@@ -4320,6 +4324,18 @@ static struct config_string ConfigureNamesString[] =
 		check_canonical_path, assign_pgstat_temp_directory, NULL
 	},
 
+#ifdef USE_NSS
+	{
+		{"ssl_database", PGC_SIGHUP, CONN_AUTH_SSL,
+			gettext_noop("Location of the NSS certificate database."),
+			NULL
+		},
+		&ssl_database,
+		"",
+		NULL, NULL, NULL
+	},
+#endif
+
 	{
 		{"synchronous_standby_names", PGC_SIGHUP, REPLICATION_PRIMARY,
 			gettext_noop("Number of synchronous standbys and list of names of potential synchronous ones."),
@@ -4348,8 +4364,10 @@ static struct config_string ConfigureNamesString[] =
 			GUC_SUPERUSER_ONLY
 		},
 		&SSLCipherSuites,
-#ifdef USE_OPENSSL
+#if defined(USE_OPENSSL)
 		"HIGH:MEDIUM:+3DES:!aNULL",
+#elif defined (USE_NSS)
+		"",
 #else
 		"none",
 #endif
diff --git a/src/common/Makefile b/src/common/Makefile
index 25c55bd642..614f93af09 100644
--- a/src/common/Makefile
+++ b/src/common/Makefile
@@ -79,7 +79,7 @@ OBJS_COMMON = \
 	wait_error.o \
 	wchar.o
 
-ifeq ($(with_openssl),yes)
+ifeq ($(with_ssl),openssl)
 OBJS_COMMON += \
 	protocol_openssl.o \
 	sha2_openssl.o
diff --git a/src/include/common/pg_nss.h b/src/include/common/pg_nss.h
new file mode 100644
index 0000000000..9205f0fc3b
--- /dev/null
+++ b/src/include/common/pg_nss.h
@@ -0,0 +1,141 @@
+/*-------------------------------------------------------------------------
+ *
+ * pg_nss.h
+ *	  Support for NSS as a TLS backend
+ *
+ * These definitions are used by both frontend and backend code.
+ *
+ * Copyright (c) 2020, PostgreSQL Global Development Group
+ *
+ * IDENTIFICATION
+ *        src/include/common/pg_nss.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef PG_NSS_H
+#define PG_NSS_H
+
+#ifdef USE_NSS
+
+#include <nss/sslproto.h>
+
+PRUint16	pg_find_cipher(char *name);
+
+typedef struct
+{
+	const char *name;
+	PRUint16	number;
+}			NSSCiphers;
+
+#define INVALID_CIPHER	0xFFFF
+
+/*
+ * This list is a partial copy of the ciphers in NSS files lib/ssl/sslproto.h
+ * in order to provide a human readable version of the ciphers. It would be
+ * nice to not have to have this, but NSS doesn't provide any API addressing
+ * the ciphers by name. TODO: do we want more of the ciphers, or perhaps less?
+ */
+static const NSSCiphers NSS_CipherList[] = {
+
+	{"TLS_NULL_WITH_NULL_NULL", TLS_NULL_WITH_NULL_NULL},
+
+	{"TLS_RSA_WITH_NULL_MD5", TLS_RSA_WITH_NULL_MD5},
+	{"TLS_RSA_WITH_NULL_SHA", TLS_RSA_WITH_NULL_SHA},
+	{"TLS_RSA_WITH_RC4_128_MD5", TLS_RSA_WITH_RC4_128_MD5},
+	{"TLS_RSA_WITH_RC4_128_SHA", TLS_RSA_WITH_RC4_128_SHA},
+	{"TLS_RSA_WITH_IDEA_CBC_SHA", TLS_RSA_WITH_IDEA_CBC_SHA},
+	{"TLS_RSA_WITH_DES_CBC_SHA", TLS_RSA_WITH_DES_CBC_SHA},
+	{"TLS_RSA_WITH_3DES_EDE_CBC_SHA", TLS_RSA_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_DH_DSS_WITH_DES_CBC_SHA", TLS_DH_DSS_WITH_DES_CBC_SHA},
+	{"TLS_DH_DSS_WITH_3DES_EDE_CBC_SHA", TLS_DH_DSS_WITH_3DES_EDE_CBC_SHA},
+	{"TLS_DH_RSA_WITH_DES_CBC_SHA", TLS_DH_RSA_WITH_DES_CBC_SHA},
+	{"TLS_DH_RSA_WITH_3DES_EDE_CBC_SHA", TLS_DH_RSA_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_DHE_DSS_WITH_DES_CBC_SHA", TLS_DHE_DSS_WITH_DES_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_3DES_EDE_CBC_SHA", TLS_DHE_DSS_WITH_3DES_EDE_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_DES_CBC_SHA", TLS_DHE_RSA_WITH_DES_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA", TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_DH_anon_WITH_RC4_128_MD5", TLS_DH_anon_WITH_RC4_128_MD5},
+	{"TLS_DH_anon_WITH_DES_CBC_SHA", TLS_DH_anon_WITH_DES_CBC_SHA},
+	{"TLS_DH_anon_WITH_3DES_EDE_CBC_SHA", TLS_DH_anon_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_RSA_WITH_AES_128_CBC_SHA", TLS_RSA_WITH_AES_128_CBC_SHA},
+	{"TLS_DH_DSS_WITH_AES_128_CBC_SHA", TLS_DH_DSS_WITH_AES_128_CBC_SHA},
+	{"TLS_DH_RSA_WITH_AES_128_CBC_SHA", TLS_DH_RSA_WITH_AES_128_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_AES_128_CBC_SHA", TLS_DHE_DSS_WITH_AES_128_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_AES_128_CBC_SHA", TLS_DHE_RSA_WITH_AES_128_CBC_SHA},
+	{"TLS_DH_anon_WITH_AES_128_CBC_SHA", TLS_DH_anon_WITH_AES_128_CBC_SHA},
+
+	{"TLS_RSA_WITH_AES_256_CBC_SHA", TLS_RSA_WITH_AES_256_CBC_SHA},
+	{"TLS_DH_DSS_WITH_AES_256_CBC_SHA", TLS_DH_DSS_WITH_AES_256_CBC_SHA},
+	{"TLS_DH_RSA_WITH_AES_256_CBC_SHA", TLS_DH_RSA_WITH_AES_256_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_AES_256_CBC_SHA", TLS_DHE_DSS_WITH_AES_256_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_AES_256_CBC_SHA", TLS_DHE_RSA_WITH_AES_256_CBC_SHA},
+	{"TLS_DH_anon_WITH_AES_256_CBC_SHA", TLS_DH_anon_WITH_AES_256_CBC_SHA},
+	{"TLS_RSA_WITH_NULL_SHA256", TLS_RSA_WITH_NULL_SHA256},
+	{"TLS_RSA_WITH_AES_128_CBC_SHA256", TLS_RSA_WITH_AES_128_CBC_SHA256},
+	{"TLS_RSA_WITH_AES_256_CBC_SHA256", TLS_RSA_WITH_AES_256_CBC_SHA256},
+
+	{"TLS_DHE_DSS_WITH_AES_128_CBC_SHA256", TLS_DHE_DSS_WITH_AES_128_CBC_SHA256},
+	{"TLS_RSA_WITH_CAMELLIA_128_CBC_SHA", TLS_RSA_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DH_DSS_WITH_CAMELLIA_128_CBC_SHA", TLS_DH_DSS_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DH_RSA_WITH_CAMELLIA_128_CBC_SHA", TLS_DH_RSA_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_CAMELLIA_128_CBC_SHA", TLS_DHE_DSS_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA", TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DH_anon_WITH_CAMELLIA_128_CBC_SHA", TLS_DH_anon_WITH_CAMELLIA_128_CBC_SHA},
+
+	{"TLS_DHE_DSS_WITH_RC4_128_SHA", TLS_DHE_DSS_WITH_RC4_128_SHA},
+	{"TLS_DHE_RSA_WITH_AES_128_CBC_SHA256", TLS_DHE_RSA_WITH_AES_128_CBC_SHA256},
+	{"TLS_DHE_DSS_WITH_AES_256_CBC_SHA256", TLS_DHE_DSS_WITH_AES_256_CBC_SHA256},
+	{"TLS_DHE_RSA_WITH_AES_256_CBC_SHA256", TLS_DHE_RSA_WITH_AES_256_CBC_SHA256},
+
+	{"TLS_RSA_WITH_CAMELLIA_256_CBC_SHA", TLS_RSA_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DH_DSS_WITH_CAMELLIA_256_CBC_SHA", TLS_DH_DSS_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DH_RSA_WITH_CAMELLIA_256_CBC_SHA", TLS_DH_RSA_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_CAMELLIA_256_CBC_SHA", TLS_DHE_DSS_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA", TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DH_anon_WITH_CAMELLIA_256_CBC_SHA", TLS_DH_anon_WITH_CAMELLIA_256_CBC_SHA},
+
+	{"TLS_RSA_WITH_SEED_CBC_SHA", TLS_RSA_WITH_SEED_CBC_SHA},
+
+	{"TLS_RSA_WITH_AES_128_GCM_SHA256", TLS_RSA_WITH_AES_128_GCM_SHA256},
+	{"TLS_RSA_WITH_AES_256_GCM_SHA384", TLS_RSA_WITH_AES_256_GCM_SHA384},
+	{"TLS_DHE_RSA_WITH_AES_128_GCM_SHA256", TLS_DHE_RSA_WITH_AES_128_GCM_SHA256},
+	{"TLS_DHE_RSA_WITH_AES_256_GCM_SHA384", TLS_DHE_RSA_WITH_AES_256_GCM_SHA384},
+	{"TLS_DHE_DSS_WITH_AES_128_GCM_SHA256", TLS_DHE_DSS_WITH_AES_128_GCM_SHA256},
+	{"TLS_DHE_DSS_WITH_AES_256_GCM_SHA384", TLS_DHE_DSS_WITH_AES_256_GCM_SHA384},
+
+	{"TLS_AES_128_GCM_SHA256", TLS_AES_128_GCM_SHA256},
+	{"TLS_AES_256_GCM_SHA384", TLS_AES_256_GCM_SHA384},
+	{"TLS_CHACHA20_POLY1305_SHA256", TLS_CHACHA20_POLY1305_SHA256},
+	{NULL, 0}
+};
+
+/*
+ * pg_find_cipher
+ *			Translate an NSS ciphername to the cipher code
+ *
+ * Searches the configured ciphers for the corresponding cipher code to the
+ * name. Search is performed case insensitive.
+ */
+PRUint16
+pg_find_cipher(char *name)
+{
+	const		NSSCiphers *cipher_list = NSS_CipherList;
+
+	while (cipher_list->name)
+	{
+		if (pg_strcasecmp(cipher_list->name, name) == 0)
+			return cipher_list->number;
+
+		cipher_list++;
+	}
+
+	return 0xFFFF;
+}
+
+#endif							/* USE_NSS */
+
+#endif							/* PG_NSS_H */
diff --git a/src/include/libpq/libpq-be.h b/src/include/libpq/libpq-be.h
index 0a23281ad5..b68ef64ec9 100644
--- a/src/include/libpq/libpq-be.h
+++ b/src/include/libpq/libpq-be.h
@@ -192,13 +192,18 @@ typedef struct Port
 	bool		peer_cert_valid;
 
 	/*
-	 * OpenSSL structures. (Keep these last so that the locations of other
-	 * fields are the same whether or not you build with OpenSSL.)
+	 * SSL backend specific structures. (Keep these last so that the locations
+	 * of other fields are the same whether or not you build with SSL
+	 * enabled.)
 	 */
 #ifdef USE_OPENSSL
 	SSL		   *ssl;
 	X509	   *peer;
 #endif
+
+#ifdef USE_NSS
+	void	   *pr_fd;
+#endif
 } Port;
 
 #ifdef USE_SSL
@@ -292,6 +297,10 @@ extern char *be_tls_get_certificate_hash(Port *port, size_t *len);
 typedef void (*openssl_tls_init_hook_typ) (SSL_CTX *context, bool isServerStart);
 extern PGDLLIMPORT openssl_tls_init_hook_typ openssl_tls_init_hook;
 #endif
+#ifdef USE_NSS
+typedef void (*nss_tls_init_hook_type) (bool isServerStart);
+extern PGDLLIMPORT nss_tls_init_hook_type nss_tls_init_hook;
+#endif
 
 #endif							/* USE_SSL */
 
diff --git a/src/include/libpq/libpq.h b/src/include/libpq/libpq.h
index b1152475ac..298d87ecae 100644
--- a/src/include/libpq/libpq.h
+++ b/src/include/libpq/libpq.h
@@ -88,6 +88,9 @@ extern PGDLLIMPORT bool ssl_passphrase_command_supports_reload;
 #ifdef USE_SSL
 extern bool ssl_loaded_verify_locations;
 #endif
+#ifdef USE_NSS
+extern char *ssl_database;
+#endif
 
 extern int	secure_initialize(bool isServerStart);
 extern bool secure_loaded_verify_locations(void);
diff --git a/src/include/pg_config.h.in b/src/include/pg_config.h.in
index fb270df678..31f808398c 100644
--- a/src/include/pg_config.h.in
+++ b/src/include/pg_config.h.in
@@ -893,6 +893,9 @@
 /* Define to 1 to build with PAM support. (--with-pam) */
 #undef USE_PAM
 
+/* Define to build with NSS support (--with-nss) */
+#undef USE_NSS
+
 /* Define to 1 to use software CRC-32C implementation (slicing-by-8). */
 #undef USE_SLICING_BY_8_CRC32C
 
diff --git a/src/include/pg_config_manual.h b/src/include/pg_config_manual.h
index 705dc69c06..c28b84126d 100644
--- a/src/include/pg_config_manual.h
+++ b/src/include/pg_config_manual.h
@@ -176,10 +176,9 @@
 
 /*
  * USE_SSL code should be compiled only when compiling with an SSL
- * implementation.  (Currently, only OpenSSL is supported, but we might add
- * more implementations in the future.)
+ * implementation.
  */
-#ifdef USE_OPENSSL
+#if defined(USE_OPENSSL) || defined(USE_NSS)
 #define USE_SSL
 #endif
 
diff --git a/src/interfaces/libpq/Makefile b/src/interfaces/libpq/Makefile
index 4ac5f4b340..e902f38c8e 100644
--- a/src/interfaces/libpq/Makefile
+++ b/src/interfaces/libpq/Makefile
@@ -45,12 +45,21 @@ OBJS = \
 	pqexpbuffer.o \
 	fe-auth.o
 
-ifeq ($(with_openssl),yes)
+ifneq ($(with_ssl),no)
+OBJS += \
+	fe-secure-common.o
+endif
+
+ifeq ($(with_ssl),openssl)
 OBJS += \
-	fe-secure-common.o \
 	fe-secure-openssl.o
 endif
 
+ifeq ($(with_ssl), nss)
+OBJS += \
+	fe-secure-nss.o
+endif
+
 ifeq ($(with_gssapi),yes)
 OBJS += \
 	fe-gssapi-common.o \
diff --git a/src/interfaces/libpq/fe-connect.c b/src/interfaces/libpq/fe-connect.c
index b0ca37c2ed..a15a89c50c 100644
--- a/src/interfaces/libpq/fe-connect.c
+++ b/src/interfaces/libpq/fe-connect.c
@@ -355,6 +355,10 @@ static const internalPQconninfoOption PQconninfoOptions[] = {
 		"Target-Session-Attrs", "", 11, /* sizeof("read-write") = 11 */
 	offsetof(struct pg_conn, target_session_attrs)},
 
+	{"cert_database", NULL, NULL, NULL,
+		"CertificateDatabase", "", 64,
+	offsetof(struct pg_conn, cert_database)},
+
 	/* Terminating entry --- MUST BE LAST */
 	{NULL, NULL, NULL, NULL,
 	NULL, NULL, 0}
diff --git a/src/interfaces/libpq/fe-secure-nss.c b/src/interfaces/libpq/fe-secure-nss.c
new file mode 100644
index 0000000000..395147f551
--- /dev/null
+++ b/src/interfaces/libpq/fe-secure-nss.c
@@ -0,0 +1,1018 @@
+/*-------------------------------------------------------------------------
+ *
+ * fe-secure-nss.c
+ *	  functions for supporting NSS as a TLS backend for frontend libpq
+ *
+ * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ *	  src/interfaces/libpq/fe-secure-nss.c
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#include "postgres_fe.h"
+
+#include "libpq-fe.h"
+#include "fe-auth.h"
+#include "fe-secure-common.h"
+#include "libpq-int.h"
+
+/*
+ * BITS_PER_BYTE is also defined in the NSPR header files, so we need to undef
+ * our version to avoid compiler warnings on redefinition.
+ */
+#define pg_BITS_PER_BYTE BITS_PER_BYTE
+#undef BITS_PER_BYTE
+
+/*
+ * The nspr/obsolete/protypes.h NSPR header typedefs uint64 and int64 with
+ * colliding definitions from ours, causing a much expected compiler error.
+ * Remove backwards compatibility with ancient NSPR versions to avoid this.
+ */
+#define NO_NSPR_10_SUPPORT
+#include <nspr/nspr.h>
+#include <nspr/prerror.h>
+#include <nspr/prinit.h>
+#include <nspr/prio.h>
+#include <nss/nss.h>
+#include <nss/ssl.h>
+#include <nss/sslproto.h>
+#include <nss/pk11func.h>
+#include <nss/secerr.h>
+#include <nss/secmod.h>
+
+/*
+ * Ensure that the colliding definitions match, else throw an error. In case
+ * NSPR remove the definition in a future version (however unlikely that may
+ * be, make sure to put ours back again.
+ */
+#if defined(BITS_PER_BYTE)
+#if BITS_PER_BYTE != pg_BITS_PER_BYTE
+#error "incompatible byte widths between NSPR and PostgreSQL"
+#endif
+#else
+#define BITS_PER_BYTE pg_BITS_PER_BYTE
+#endif
+#undef pg_BITS_PER_BYTE
+
+static SECStatus pg_load_nss_module(SECMODModule * *module, const char *library, const char *name);
+static SECStatus pg_bad_cert_handler(void *arg, PRFileDesc * fd);
+static const char *pg_SSLerrmessage(PRErrorCode errcode);
+static SECStatus pg_client_auth_handler(void *arg, PRFileDesc * socket, CERTDistNames * caNames,
+										CERTCertificate * *pRetCert, SECKEYPrivateKey * *pRetKey);
+static SECStatus pg_cert_auth_handler(void *arg, PRFileDesc * fd, PRBool checksig, PRBool isServer);
+static int	ssl_protocol_version_to_nss(const char *protocol);
+static bool cert_database_has_CA(PGconn *conn);
+
+static char *PQssl_passwd_cb(PK11SlotInfo * slot, PRBool retry, void *arg);
+
+/*
+ * PR_ImportTCPSocket() is a private API, but very widely used, as it's the
+ * only way to make NSS use an already set up POSIX file descriptor rather
+ * than opening one itself. To quote the NSS documentation:
+ *
+ *		"In theory, code that uses PR_ImportTCPSocket may break when NSPR's
+ *		implementation changes. In practice, this is unlikely to happen because
+ *		NSPR's implementation has been stable for years and because of NSPR's
+ *		strong commitment to backward compatibility."
+ *
+ * https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSPR/Reference/PR_ImportTCPSocket
+ *
+ * The function is declared in <private/pprio.h>, but as it is a header marked
+ * private we declare it here rather than including it.
+ */
+NSPR_API(PRFileDesc *) PR_ImportTCPSocket(int);
+
+static SECMODModule * ca_trust = NULL;
+static NSSInitContext * nss_context = NULL;
+
+/*
+ * Track whether the NSS database has a password set or not. There is no API
+ * function for retrieving password status, so we simply flip this to true in
+ * case NSS invoked the password callback - as that will only happen in case
+ * there is a password. The reason for tracking this is that there are calls
+ * which require a password parameter, but doesn't use the callbacks provided,
+ * so we must call the callback on behalf of these.
+ */
+static bool has_password = false;
+
+/*
+ * This logic exist in NSS as well, but it's only available for when there is
+ * a database to open, and not only using the system trust store. Thus, we
+ * need to keep our own copy.
+ */
+#if defined(WIN32)
+static const char *ca_trust_name = "nssckbi.dll";
+#elif defined(__darwin__)
+static const char *ca_trust_name = "libnssckbi.dylib";
+#else
+static const char *ca_trust_name = "libnssckbi.so";
+#endif
+
+static PQsslKeyPassHook_nss_type PQsslKeyPassHook = NULL;
+
+/* ------------------------------------------------------------ */
+/*			 Procedures common to all secure sessions			*/
+/* ------------------------------------------------------------ */
+
+/*
+ * pgtls_init_library
+ *
+ * There is no direct equivalent for PQinitOpenSSL in NSS/NSPR, with PR_Init
+ * being the closest match there is. PR_Init is however already documented to
+ * not be required so simply making this a noop seems like the best option.
+ */
+void
+pgtls_init_library(bool do_ssl, int do_crypto)
+{
+	/* noop */
+}
+
+int
+pgtls_init(PGconn *conn)
+{
+	conn->ssl_in_use = false;
+
+	return 0;
+}
+
+void
+pgtls_close(PGconn *conn)
+{
+	if (nss_context)
+	{
+		NSS_ShutdownContext(nss_context);
+		nss_context = NULL;
+	}
+}
+
+PostgresPollingStatusType
+pgtls_open_client(PGconn *conn)
+{
+	SECStatus	status;
+	PRFileDesc *pr_fd;
+	PRFileDesc *model;
+	NSSInitParameters params;
+	SSLVersionRange desired_range;
+
+	/*
+	 * The NSPR documentation states that runtime initialization via PR_Init
+	 * is no longer required, as the first caller into NSPR will perform the
+	 * initialization implicitly. See be-secure-nss.c for further discussion
+	 * on PR_Init.
+	 */
+	PR_Init(PR_USER_THREAD, PR_PRIORITY_NORMAL, 0);
+
+	/*
+	 * NSS initialization and the use of contexts is further discussed in
+	 * be-secure-nss.c
+	 */
+	memset(&params, 0, sizeof(params));
+	params.length = sizeof(params);
+
+	if (conn->cert_database && strlen(conn->cert_database) > 0)
+	{
+		char	   *cert_database_path = psprintf("sql:%s", conn->cert_database);
+
+		nss_context = NSS_InitContext(cert_database_path, "", "", "",
+									  &params,
+									  NSS_INIT_READONLY | NSS_INIT_PK11RELOAD);
+		pfree(cert_database_path);
+	}
+	else
+		nss_context = NSS_InitContext("", "", "", "", &params,
+									  NSS_INIT_READONLY | NSS_INIT_NOCERTDB |
+									  NSS_INIT_NOMODDB | NSS_INIT_FORCEOPEN |
+									  NSS_INIT_NOROOTINIT | NSS_INIT_PK11RELOAD);
+
+	if (!nss_context)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to %s certificate database: %s"),
+						  conn->cert_database ? "open" : "create",
+						  pg_SSLerrmessage(PR_GetError()));
+
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * Configure cipher policy.
+	 */
+	status = NSS_SetDomesticPolicy();
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to configure cipher policy: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * If we don't have a certificate database, the system trust store is the
+	 * fallback we can use. If we fail to initialize that as well, we can
+	 * still attempt a connection as long as the sslmode isn't verify*.
+	 */
+	if (!conn->cert_database && conn->sslmode[0] == 'v')
+	{
+		status = pg_load_nss_module(&ca_trust, ca_trust_name, "\"Root Certificates\"");
+		if (status != SECSuccess)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("WARNING: unable to load NSS trust module \"%s\" : %s"),
+							  ca_trust_name,
+							  pg_SSLerrmessage(PR_GetError()));
+
+			return PGRES_POLLING_FAILED;
+		}
+	}
+
+
+	PK11_SetPasswordFunc(PQssl_passwd_cb);
+
+	/*
+	 * Import the already opened socket as we don't want to use NSPR functions
+	 * for opening the network socket due to how the PostgreSQL protocol works
+	 * with TLS connections. This function is not part of the NSPR public API,
+	 * see the comment at the top of the file for the rationale of still using
+	 * it.
+	 */
+	pr_fd = PR_ImportTCPSocket(conn->sock);
+	if (!pr_fd)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to attach to socket: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * Most of the documentation available, and implementations of, NSS/NSPR
+	 * use the PR_NewTCPSocket() function here, which has the drawback that it
+	 * can only create IPv4 sockets. Instead use PR_OpenTCPSocket() which
+	 * copes with IPv6 as well.
+	 */
+	model = SSL_ImportFD(NULL, PR_OpenTCPSocket(conn->laddr.addr.ss_family));
+	if (!model)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to enable TLS: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/* Disable old protocol versions (SSLv2 and SSLv3) */
+	SSL_OptionSet(model, SSL_ENABLE_SSL2, PR_FALSE);
+	SSL_OptionSet(model, SSL_V2_COMPATIBLE_HELLO, PR_FALSE);
+	SSL_OptionSet(model, SSL_ENABLE_SSL3, PR_FALSE);
+
+#ifdef SSL_CBC_RANDOM_IV
+
+	/*
+	 * Enable protection against the BEAST attack in case the NSS library has
+	 * support for that. While SSLv3 is disabled, we may still allow TLSv1
+	 * which is affected. The option isn't documented as an SSL option, but as
+	 * an NSS environment variable.
+	 */
+	SSL_OptionSet(model, SSL_CBC_RANDOM_IV, PR_TRUE);
+#endif
+
+	/* Set us up as a TLS client for the handshake */
+	SSL_OptionSet(model, SSL_HANDSHAKE_AS_CLIENT, PR_TRUE);
+
+	/*
+	 * When setting the available protocols, we either use the user defined
+	 * configuration values, and if missing we accept whatever is the highest
+	 * version supported by the library as the max and only limit the range in
+	 * the other end at TLSv1.0. ssl_variant_stream is a ProtocolVariant enum
+	 * for Stream protocols, rather than datagram.
+	 */
+	SSL_VersionRangeGetSupported(ssl_variant_stream, &desired_range);
+	desired_range.min = SSL_LIBRARY_VERSION_TLS_1_0;
+
+	if (conn->ssl_min_protocol_version && strlen(conn->ssl_min_protocol_version) > 0)
+	{
+		int			ssl_min_ver = ssl_protocol_version_to_nss(conn->ssl_min_protocol_version);
+
+		if (ssl_min_ver == -1)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("invalid value \"%s\" for minimum version of SSL protocol\n"),
+							  conn->ssl_min_protocol_version);
+			return -1;
+		}
+
+		desired_range.min = ssl_min_ver;
+	}
+
+	if (conn->ssl_max_protocol_version && strlen(conn->ssl_max_protocol_version) > 0)
+	{
+		int			ssl_max_ver = ssl_protocol_version_to_nss(conn->ssl_max_protocol_version);
+
+		if (ssl_max_ver == -1)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("invalid value \"%s\" for maximum version of SSL protocol\n"),
+							  conn->ssl_max_protocol_version);
+			return -1;
+		}
+
+		desired_range.max = ssl_max_ver;
+	}
+
+	if (SSL_VersionRangeSet(model, &desired_range) != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to set allowed SSL protocol version range: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * Set up callback for verifying server certificates, as well as for how
+	 * to handle failed verifications.
+	 */
+	SSL_AuthCertificateHook(model, pg_cert_auth_handler, (void *) conn);
+	SSL_BadCertHook(model, pg_bad_cert_handler, (void *) conn);
+
+	/*
+	 * Convert the NSPR socket to an SSL socket. Ensuring the success of this
+	 * operation is critical as NSS SSL_* functions may return SECSuccess on
+	 * the socket even though SSL hasn't been enabled, which introduce a risk
+	 * of silent downgrades.
+	 */
+	conn->pr_fd = SSL_ImportFD(model, pr_fd);
+	if (!conn->pr_fd)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to configure client for TLS: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * The model can now we closed as we've applied the settings of the model
+	 * onto the real socket. From hereon we should only use conn->pr_fd.
+	 */
+	PR_Close(model);
+
+	/* Set the private data to be passed to the password callback */
+	SSL_SetPKCS11PinArg(conn->pr_fd, (void *) conn);
+
+	/*
+	 * If a CRL file has been specified, verify if it exists in the database
+	 * but don't fail in case it doesn't.
+	 */
+	if (conn->sslcrl && strlen(conn->sslcrl) > 0)
+	{
+		/* XXX: Implement me.. */
+	}
+
+	status = SSL_ResetHandshake(conn->pr_fd, PR_FALSE);
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to initiate handshake: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * Set callback for client authentication when requested by the server.
+	 */
+	SSL_GetClientAuthDataHook(conn->pr_fd, pg_client_auth_handler, (void *) conn);
+
+	/*
+	 * Specify which hostname we are expecting to talk to. This is required,
+	 * albeit mostly applies to when opening a connection to a traditional
+	 * http server it seems.
+	 */
+	SSL_SetURL(conn->pr_fd, (conn->connhost[conn->whichhost]).host);
+
+	do
+	{
+		status = SSL_ForceHandshake(conn->pr_fd);
+	}
+	while (status != SECSuccess && PR_GetError() == PR_WOULD_BLOCK_ERROR);
+
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("SSL error: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	conn->ssl_in_use = true;
+	return PGRES_POLLING_OK;
+}
+
+ssize_t
+pgtls_read(PGconn *conn, void *ptr, size_t len)
+{
+	PRInt32		nread;
+	PRErrorCode status;
+	int			read_errno = 0;
+
+	/*
+	 * PR_Recv blocks until there is data to read or the timeout expires. We
+	 * don't want to sit blocked here, so the timeout is turned off by using
+	 * PR_INTERVAL_NO_WAIT which means "return immediately",  Zero is returned
+	 * for closed connections, while -1 indicates an error within the ongoing
+	 * connection.
+	 */
+	nread = PR_Recv(conn->pr_fd, ptr, len, 0, PR_INTERVAL_NO_WAIT);
+
+	if (nread == 0)
+	{
+		read_errno = ECONNRESET;
+		return -1;
+	}
+
+	if (nread == -1)
+	{
+		status = PR_GetError();
+
+		switch (status)
+		{
+			case PR_WOULD_BLOCK_ERROR:
+				read_errno = EWOULDBLOCK;
+				break;
+
+				/*
+				 * The error cases for PR_Recv are not documented, but can be
+				 * reverse engineered from _MD_unix_map_default_error() in the
+				 * NSPR code, defined in pr/src/md/unix/unix_errors.c.
+				 */
+			default:
+				read_errno = ECONNRESET;
+				break;
+		}
+
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("TLS read error: %s"),
+						  pg_SSLerrmessage(status));
+	}
+
+	SOCK_ERRNO_SET(read_errno);
+	return (ssize_t) nread;
+}
+
+/*
+ * pgtls_read_pending
+ *		Check for the existence of data to be read.
+ *
+ * This is part of the PostgreSQL TLS backend API.
+ */
+bool
+pgtls_read_pending(PGconn *conn)
+{
+	unsigned char c;
+	int			n;
+
+	/*
+	 * PR_Recv peeks into the stream with the timeount turned off, to see if
+	 * there is another byte to read off the wire. There is an NSS function
+	 * SSL_DataPending() which might seem like a better fit, but it will only
+	 * check already encrypted data in the SSL buffer, not still unencrypted
+	 * data, thus it doesn't guarantee that a subsequent call to
+	 * PR_Read/PR_Recv wont block.
+	 */
+	n = PR_Recv(conn->pr_fd, &c, 1, PR_MSG_PEEK, PR_INTERVAL_NO_WAIT);
+	return (n > 0);
+}
+
+ssize_t
+pgtls_write(PGconn *conn, const void *ptr, size_t len)
+{
+	PRInt32		n;
+	PRErrorCode status;
+	int			write_errno = 0;
+
+	n = PR_Write(conn->pr_fd, ptr, len);
+
+	if (n < 0)
+	{
+		status = PR_GetError();
+
+		switch (status)
+		{
+			case PR_WOULD_BLOCK_ERROR:
+#ifdef EAGAIN
+				write_errno = EAGAIN;
+#else
+				write_errno = EINTR;
+#endif
+				break;
+
+			default:
+				printfPQExpBuffer(&conn->errorMessage,
+								  libpq_gettext("TLS write error: %s"),
+								  pg_SSLerrmessage(status));
+				write_errno = ECONNRESET;
+				break;
+		}
+	}
+
+	SOCK_ERRNO_SET(write_errno);
+	return (ssize_t) n;
+}
+
+/*
+ *	Verify that the server certificate matches the hostname we connected to.
+ *
+ * The certificate's Common Name and Subject Alternative Names are considered.
+ */
+int
+pgtls_verify_peer_name_matches_certificate_guts(PGconn *conn,
+												int *names_examined,
+												char **first_name)
+{
+	char		   *server_hostname = NULL;
+	CERTCertificate *server_cert = NULL;
+	SECStatus status = SECSuccess;
+	SECItem			altname_item;
+	PLArenaPool	   *arena = NULL;
+	CERTGeneralName *san_list;
+	CERTGeneralName *cn;
+
+	server_hostname = SSL_RevealURL(conn->pr_fd);
+	if (!server_hostname || server_hostname[0] == '\0')
+		goto done;
+
+	/*
+	 * CERT_VerifyCertName will internally perform RFC 2818 SubjectAltName
+	 * verification.
+	 */
+	server_cert = SSL_PeerCertificate(conn->pr_fd);
+	status = CERT_VerifyCertName(server_cert, server_hostname);
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to verify server hostname: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		goto done;
+	}
+
+	status = CERT_FindCertExtension(server_cert, SEC_OID_X509_SUBJECT_ALT_NAME,
+									&altname_item);
+	if (status == SECSuccess)
+	{
+		arena = PORT_NewArena(DER_DEFAULT_CHUNKSIZE);
+		if (!arena)
+		{
+			status = SECFailure;
+			goto done;
+		}
+		san_list = CERT_DecodeAltNameExtension(arena, &altname_item);
+		if (!san_list)
+		{
+			status = SECFailure;
+			goto done;
+		}
+
+		for (cn = san_list; cn != san_list; cn = CERT_GetNextGeneralName(cn))
+		{
+			char	   *alt_name;
+			int			rv;
+			char		tmp[512];
+
+			status = CERT_RFC1485_EscapeAndQuote(tmp, sizeof(tmp),
+												 (char *) cn->name.other.data,
+												 cn->name.other.len);
+
+			if (status != SECSuccess)
+				goto done;
+
+			rv = pq_verify_peer_name_matches_certificate_name(conn, tmp,
+															  strlen(tmp),
+															  &alt_name);
+			if (alt_name)
+			{
+				if (!*first_name)
+					*first_name = alt_name;
+				else
+					free(alt_name);
+			}
+
+			if (rv == 1)
+				status = SECSuccess;
+			else
+			{
+				status = SECFailure;
+				break;
+			}
+		}
+	}
+	else if (PORT_GetError() == SEC_ERROR_EXTENSION_NOT_FOUND)
+		status = SECSuccess;
+	else
+		status = SECSuccess;
+
+done:
+	/* san_list will be freed by freeing the arena it was allocated in */
+	if (arena)
+		PORT_FreeArena(arena, PR_TRUE);
+	PR_Free(server_hostname);
+
+	if (status == SECSuccess)
+		return 1;
+
+	return 0;
+}
+
+/* ------------------------------------------------------------ */
+/*			PostgreSQL specific TLS support functions			*/
+/* ------------------------------------------------------------ */
+
+static const char *
+pg_SSLerrmessage(PRErrorCode errcode)
+{
+	const char *error;
+
+	error = PR_ErrorToName(errcode);
+	if (error)
+		return error;
+
+	return "unknown TLS error";
+}
+
+static SECStatus
+pg_load_nss_module(SECMODModule * *module, const char *library, const char *name)
+{
+	SECMODModule *mod;
+	char	   *modulespec;
+
+	modulespec = psprintf("library=\"%s\", name=\"%s\"", library, name);
+
+	/*
+	 * Attempt to load the specified module. The second parameter is "parent"
+	 * which should always be NULL for application code. The third parameter
+	 * defines if loading should recurse which is only applicable when loading
+	 * a module from within another module. This hierarchy would have to be
+	 * defined in the modulespec, and since we don't support anything but
+	 * directly addressed modules we should pass PR_FALSE.
+	 */
+	mod = SECMOD_LoadUserModule(modulespec, NULL, PR_FALSE);
+	pfree(modulespec);
+
+	if (mod && mod->loaded)
+	{
+		*module = mod;
+		return SECSuccess;
+	}
+
+	SECMOD_DestroyModule(mod);
+	return SECFailure;
+}
+
+/* ------------------------------------------------------------ */
+/*						NSS Callbacks							*/
+/* ------------------------------------------------------------ */
+
+/*
+ * pg_cert_auth_handler
+ *			Callback for authenticating server certificate
+ *
+ * This is pretty much the same procedure as the SSL_AuthCertificate function
+ * provided by NSS, with the difference being server hostname validation. With
+ * SSL_AuthCertificate there is no way to do verify-ca, it only does the -full
+ * flavor of our sslmodes, so we need our own implementation.
+ */
+static SECStatus
+pg_cert_auth_handler(void *arg, PRFileDesc *fd, PRBool checksig, PRBool isServer)
+{
+	SECStatus	status;
+	PGconn	   *conn = (PGconn *) arg;
+	CERTCertificate *server_cert;
+	void	   *pin;
+
+	Assert(!isServer);
+
+	pin = SSL_RevealPinArg(conn->pr_fd);
+	server_cert = SSL_PeerCertificate(conn->pr_fd);
+
+	status = CERT_VerifyCertificateNow((CERTCertDBHandle *) CERT_GetDefaultCertDB(),
+									   server_cert,
+									   checksig,
+									   certificateUsageSSLServer,
+									   pin,
+									   NULL);
+
+	/*
+	 * If we've already failed validation then there is no point in also
+	 * performing the hostname check for verify-full.
+	 */
+	if (status == SECSuccess)
+	{
+		if (!pq_verify_peer_name_matches_certificate(conn))
+			status = SECFailure;
+	}
+	else
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to verify certificate: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+	}
+
+	return status;
+}
+
+/*
+ * pg_client_auth_handler
+ *		Callback for client certificate validation
+ *
+ * The client auth callback is not on by default in NSS, so we need to invoke
+ * it ourselves to ensure we can do cert authentication. A TODO is to support
+ * running without a specified sslcert parameter. By retrieving all the certs
+ * via nickname from the cert database and see if we find one which apply with
+ * NSS_CmpCertChainWCANames() and PK11_FindKeyByAnyCert() we could support
+ * just running with a ssl database specified.
+ *
+ * For now, we use the default client certificate validation which requires a
+ * defined nickname to identify the cert in the database.
+ */
+static SECStatus
+pg_client_auth_handler(void *arg, PRFileDesc * socket, CERTDistNames * caNames,
+					   CERTCertificate * *pRetCert, SECKEYPrivateKey * *pRetKey)
+{
+	PGconn	   *conn = (PGconn *) arg;
+
+	return NSS_GetClientAuthData(conn->sslcert, socket, caNames, pRetCert, pRetKey);
+}
+
+/*
+ * pg_bad_cert_handler
+ *		Callback for failed certificate validation
+ *
+ * The TLS handshake will call this function iff the server certificate failed
+ * validation. Depending on the sslmode, we allow the connection anyways.
+ */
+static SECStatus
+pg_bad_cert_handler(void *arg, PRFileDesc * fd)
+{
+	PGconn	   *conn = (PGconn *) arg;
+	PRErrorCode err;
+
+	/*
+	 * This really shouldn't happen, as we've the the PGconn object as our
+	 * callback data, and at the callsite we know it will be populated. That
+	 * being said, the NSS code itself performs this check even when it should
+	 * not be required so let's use the same belts with our suspenders.
+	 */
+	if (!arg)
+		return SECFailure;
+
+	/*
+	 * For sslmodes other than verify-full and verify-ca we don't perform peer
+	 * validation, so return immediately.  sslmode require with a database
+	 * specified which contains a CA certificate will work like verify-ca to
+	 * be compatible with the OpenSSL implementation.
+	 */
+	if (strcmp(conn->sslmode, "require") == 0)
+	{
+		if (conn->cert_database && strlen(conn->cert_database) > 0 && cert_database_has_CA(conn))
+			return SECFailure;
+	}
+	if (conn->sslmode[0] == 'v')
+		return SECFailure;
+
+	err = PORT_GetError();
+
+	/*
+	 * TODO: these are relevant error codes that can occur in certificate
+	 * validation, figure out which we dont want for require/prefer etc.
+	 */
+	switch (err)
+	{
+		case SEC_ERROR_INVALID_AVA:
+		case SEC_ERROR_INVALID_TIME:
+		case SEC_ERROR_BAD_SIGNATURE:
+		case SEC_ERROR_EXPIRED_CERTIFICATE:
+		case SEC_ERROR_UNKNOWN_ISSUER:
+		case SEC_ERROR_UNTRUSTED_ISSUER:
+		case SEC_ERROR_UNTRUSTED_CERT:
+		case SEC_ERROR_CERT_VALID:
+		case SEC_ERROR_EXPIRED_ISSUER_CERTIFICATE:
+		case SEC_ERROR_CRL_EXPIRED:
+		case SEC_ERROR_CRL_BAD_SIGNATURE:
+		case SEC_ERROR_EXTENSION_VALUE_INVALID:
+		case SEC_ERROR_CA_CERT_INVALID:
+		case SEC_ERROR_CERT_USAGES_INVALID:
+		case SEC_ERROR_UNKNOWN_CRITICAL_EXTENSION:
+			return SECSuccess;
+			break;
+		default:
+			return SECFailure;
+			break;
+	}
+
+	/* Unreachable */
+	return SECSuccess;
+}
+
+/* ------------------------------------------------------------ */
+/*					SSL information functions					*/
+/* ------------------------------------------------------------ */
+
+/*
+ * PQgetssl
+ *
+ * Return NULL as this is legacy and defined to always be equal to calling
+ * PQsslStruct(conn, "OpenSSL"); This should ideally trigger a logged warning
+ * somewhere as it's nonsensical to run in a non-OpenSSL build, but the color
+ * of said bikeshed hasn't yet been determined.
+ */
+void *
+PQgetssl(PGconn *conn)
+{
+	return NULL;
+}
+
+void *
+PQsslStruct(PGconn *conn, const char *struct_name)
+{
+	if (!conn)
+		return NULL;
+
+	/*
+	 * Return the underlying PRFileDesc which can be used to access
+	 * information on the connection details. There is no SSL context per se.
+	 */
+	if (strcmp(struct_name, "NSS") == 0)
+		return conn->pr_fd;
+	return NULL;
+}
+
+const char *const *
+PQsslAttributeNames(PGconn *conn)
+{
+	static const char *const result[] = {
+		"library",
+		"cipher",
+		"protocol",
+		"key_bits",
+		"compression",
+		NULL
+	};
+
+	return result;
+}
+
+const char *
+PQsslAttribute(PGconn *conn, const char *attribute_name)
+{
+	SECStatus	status;
+	SSLChannelInfo channel;
+	SSLCipherSuiteInfo suite;
+
+	if (!conn || !conn->pr_fd)
+		return NULL;
+
+	if (strcmp(attribute_name, "library") == 0)
+		return "NSS";
+
+	status = SSL_GetChannelInfo(conn->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+		return NULL;
+
+	status = SSL_GetCipherSuiteInfo(channel.cipherSuite, &suite, sizeof(suite));
+	if (status != SECSuccess)
+		return NULL;
+
+	if (strcmp(attribute_name, "cipher") == 0)
+		return suite.cipherSuiteName;
+
+	if (strcmp(attribute_name, "key_bits") == 0)
+	{
+		static char key_bits_str[8];
+
+		snprintf(key_bits_str, sizeof(key_bits_str), "%i", suite.effectiveKeyBits);
+		return key_bits_str;
+	}
+
+	if (strcmp(attribute_name, "protocol") == 0)
+	{
+		switch (channel.protocolVersion)
+		{
+#ifdef SSL_LIBRARY_VERSION_TLS_1_3
+			case SSL_LIBRARY_VERSION_TLS_1_3:
+				return "TLSv1.3";
+#endif
+#ifdef SSL_LIBRARY_VERSION_TLS_1_2
+			case SSL_LIBRARY_VERSION_TLS_1_2:
+				return "TLSv1.2";
+#endif
+#ifdef SSL_LIBRARY_VERSION_TLS_1_1
+			case SSL_LIBRARY_VERSION_TLS_1_1:
+				return "TLSv1.1";
+#endif
+			case SSL_LIBRARY_VERSION_TLS_1_0:
+				return "TLSv1.0";
+			default:
+				return "unknown";
+		}
+	}
+
+	/*
+	 * NSS disabled support for compression in version 3.33, and it was only
+	 * available for SSLv3 at that point anyways, so we can safely return off
+	 * here without checking.
+	 */
+	if (strcmp(attribute_name, "compression") == 0)
+		return "off";
+
+	return NULL;
+}
+
+static int
+ssl_protocol_version_to_nss(const char *protocol)
+{
+	if (pg_strcasecmp("TLSv1", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_0;
+
+#ifdef SSL_LIBRARY_VERSION_TLS_1_1
+	if (pg_strcasecmp("TLSv1.1", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_1;
+#endif
+
+#ifdef SSL_LIBRARY_VERSION_TLS_1_2
+	if (pg_strcasecmp("TLSv1.2", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_2;
+#endif
+
+#ifdef SSL_LIBRARY_VERSION_TLS_1_3
+	if (pg_strcasecmp("TLSv1.3", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_3;
+#endif
+
+	return -1;
+}
+
+static bool
+cert_database_has_CA(PGconn *conn)
+{
+	CERTCertList *certificates;
+	bool		hasCA;
+
+	/*
+	 * If the certificate database has a password we must provide it, since
+	 * this API doesn't invoke the standard password callback.
+	 */
+	if (has_password)
+		certificates = PK11_ListCerts(PK11CertListCA, PQssl_passwd_cb(NULL, PR_FALSE, (void *) conn));
+	else
+		certificates = PK11_ListCerts(PK11CertListCA, NULL);
+	hasCA = !CERT_LIST_EMPTY(certificates);
+	CERT_DestroyCertList(certificates);
+
+	return hasCA;
+}
+
+PQsslKeyPassHook_nss_type
+PQgetSSLKeyPassHook_nss(void)
+{
+	return PQsslKeyPassHook;
+}
+
+void
+PQsetSSLKeyPassHook_nss(PQsslKeyPassHook_nss_type hook)
+{
+	PQsslKeyPassHook = hook;
+}
+
+/*
+ * Supply a password to decrypt a client certificate.
+ *
+ * This must match NSS type PK11PasswordFunc.
+ */
+static char *
+PQssl_passwd_cb(PK11SlotInfo * slot, PRBool retry, void *arg)
+{
+	has_password = true;
+
+	if (PQsslKeyPassHook)
+		return PQsslKeyPassHook(slot, (PRBool) retry, arg);
+	else
+		return PQdefaultSSLKeyPassHook_nss(slot, retry, arg);
+}
+
+/*
+ * The default password handler callback.
+ */
+char *
+PQdefaultSSLKeyPassHook_nss(PK11SlotInfo * slot, PRBool retry, void *arg)
+{
+	PGconn	   *conn = (PGconn *) arg;
+
+	/*
+	 * If the password didn't work the first time there is no point in
+	 * retrying as it hasn't changed.
+	 */
+	if (retry != PR_TRUE && conn->sslpassword && strlen(conn->sslpassword) > 0)
+		return PORT_Strdup(conn->sslpassword);
+
+	return NULL;
+}
diff --git a/src/interfaces/libpq/fe-secure.c b/src/interfaces/libpq/fe-secure.c
index 97c3805303..dd6ee15c5a 100644
--- a/src/interfaces/libpq/fe-secure.c
+++ b/src/interfaces/libpq/fe-secure.c
@@ -427,6 +427,9 @@ PQsslAttributeNames(PGconn *conn)
 
 	return result;
 }
+#endif /* USE_SSL */
+
+#ifndef USE_OPENSSL
 
 PQsslKeyPassHook_OpenSSL_type
 PQgetSSLKeyPassHook_OpenSSL(void)
@@ -445,7 +448,7 @@ PQdefaultSSLKeyPassHook_OpenSSL(char *buf, int size, PGconn *conn)
 {
 	return 0;
 }
-#endif							/* USE_SSL */
+#endif							/* USE_OPENSSL */
 
 /* Dummy version of GSSAPI information functions, when built without GSS support */
 #ifndef ENABLE_GSS
diff --git a/src/interfaces/libpq/libpq-fe.h b/src/interfaces/libpq/libpq-fe.h
index 3b6a9fbce3..27c16e187f 100644
--- a/src/interfaces/libpq/libpq-fe.h
+++ b/src/interfaces/libpq/libpq-fe.h
@@ -625,6 +625,17 @@ extern PQsslKeyPassHook_OpenSSL_type PQgetSSLKeyPassHook_OpenSSL(void);
 extern void PQsetSSLKeyPassHook_OpenSSL(PQsslKeyPassHook_OpenSSL_type hook);
 extern int	PQdefaultSSLKeyPassHook_OpenSSL(char *buf, int size, PGconn *conn);
 
+/* == in fe-secure-nss.c === */
+typedef struct PK11SlotInfoStr PK11SlotInfo;
+typedef int PRIntn;
+typedef PRIntn PRBool;
+
+/* Support for overriding sslpassword handling with a callback. */
+typedef char *(*PQsslKeyPassHook_nss_type) (PK11SlotInfo * slot, PRBool retry, void *arg);
+extern PQsslKeyPassHook_nss_type PQgetSSLKeyPassHook_nss(void);
+extern void PQsetSSLKeyPassHook_nss(PQsslKeyPassHook_nss_type hook);
+extern char *PQdefaultSSLKeyPassHook_nss(PK11SlotInfo * slot, PRBool retry, void *arg);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/src/interfaces/libpq/libpq-int.h b/src/interfaces/libpq/libpq-int.h
index 1de91ae295..49a22f6c7d 100644
--- a/src/interfaces/libpq/libpq-int.h
+++ b/src/interfaces/libpq/libpq-int.h
@@ -362,6 +362,7 @@ struct pg_conn
 	char	   *sslpassword;	/* client key file password */
 	char	   *sslrootcert;	/* root certificate filename */
 	char	   *sslcrl;			/* certificate revocation list filename */
+	char	   *cert_database;	/* NSS certificate/key database */
 	char	   *requirepeer;	/* required peer credentials for local sockets */
 	char	   *gssencmode;		/* GSS mode (require,prefer,disable) */
 	char	   *krbsrvname;		/* Kerberos service name */
@@ -485,6 +486,10 @@ struct pg_conn
 								 * OpenSSL version changes */
 #endif
 #endif							/* USE_OPENSSL */
+
+#ifdef USE_NSS
+	void	   *pr_fd;
+#endif							/* USE_NSS */
 #endif							/* USE_SSL */
 
 #ifdef ENABLE_GSS
diff --git a/src/tools/msvc/Mkvcbuild.pm b/src/tools/msvc/Mkvcbuild.pm
index 90594bd41b..29879b51af 100644
--- a/src/tools/msvc/Mkvcbuild.pm
+++ b/src/tools/msvc/Mkvcbuild.pm
@@ -192,12 +192,19 @@ sub mkvcbuild
 	$postgres->FullExportDLL('postgres.lib');
 
 	# The OBJS scraper doesn't know about ifdefs, so remove appropriate files
-	# if building without OpenSSL.
-	if (!$solution->{options}->{openssl})
+	# if building without various options.
+	if (!$solution->{options}->{openssl} && !$solution->{options}->{nss})
 	{
 		$postgres->RemoveFile('src/backend/libpq/be-secure-common.c');
+	}
+	if (!$solution->{options}->{openssl})
+	{
 		$postgres->RemoveFile('src/backend/libpq/be-secure-openssl.c');
 	}
+	if (!$solution->{options}->{nss})
+	{
+		$postgres->RemoveFile('src/backend/libpq/be-secure-nss.c');
+	}
 	if (!$solution->{options}->{gss})
 	{
 		$postgres->RemoveFile('src/backend/libpq/be-gssapi-common.c');
@@ -255,12 +262,19 @@ sub mkvcbuild
 	$libpq->AddReference($libpgcommon, $libpgport);
 
 	# The OBJS scraper doesn't know about ifdefs, so remove appropriate files
-	# if building without OpenSSL.
-	if (!$solution->{options}->{openssl})
+	# if building without various options
+	if (!$solution->{options}->{openssl} && !$solution->{options}->{nss})
 	{
 		$libpq->RemoveFile('src/interfaces/libpq/fe-secure-common.c');
+	}
+	if (!$solution->{options}->{openssl})
+	{
 		$libpq->RemoveFile('src/interfaces/libpq/fe-secure-openssl.c');
 	}
+	if (!$solution->{options}->{nss})
+	{
+		$libpq->RemoveFile('src/interfaces/libpq/fe-secure-nss.c');
+	}
 	if (!$solution->{options}->{gss})
 	{
 		$libpq->RemoveFile('src/interfaces/libpq/fe-gssapi-common.c');
diff --git a/src/tools/msvc/Solution.pm b/src/tools/msvc/Solution.pm
index bc8904732f..ac11d9ab26 100644
--- a/src/tools/msvc/Solution.pm
+++ b/src/tools/msvc/Solution.pm
@@ -484,6 +484,7 @@ sub GenerateFiles
 		USE_NAMED_POSIX_SEMAPHORES => undef,
 		USE_OPENSSL                => undef,
 		USE_OPENSSL_RANDOM         => undef,
+		USE_NSS                    => undef,
 		USE_PAM                    => undef,
 		USE_SLICING_BY_8_CRC32C    => undef,
 		USE_SSE42_CRC32C           => undef,
@@ -537,6 +538,10 @@ sub GenerateFiles
 			$define{HAVE_OPENSSL_INIT_SSL}      = 1;
 		}
 	}
+	if ($self->{options}->{nss})
+	{
+		$define{USE_NSS} = 1;
+	}
 
 	$self->GenerateConfigHeader('src/include/pg_config.h',     \%define, 1);
 	$self->GenerateConfigHeader('src/include/pg_config_ext.h', \%define, 0);
@@ -1004,6 +1009,21 @@ sub AddProject
 			}
 		}
 	}
+	if ($self->{options}->{nss})
+	{
+		$proj->AddIncludeDir($self->{options}->{nss} . '\..\public\nss');
+		$proj->AddIncludeDir($self->{options}->{nss} . '\include\nspr');
+		foreach my $lib (qw(plds4 plc4 nspr4))
+		{
+			$proj->AddLibrary($self->{options}->{nss} .
+							  '\lib\lib' . "$lib.lib", 0);
+		}
+		foreach my $lib (qw(ssl3 smime3 nss3))
+		{
+			$proj->AddLibrary($self->{options}->{nss} .
+							  '\lib' . "\\$lib.dll.lib", 0);
+		}
+	}
 	if ($self->{options}->{nls})
 	{
 		$proj->AddIncludeDir($self->{options}->{nls} . '\include');
diff --git a/src/tools/msvc/config_default.pl b/src/tools/msvc/config_default.pl
index 2ef2cfc4e9..49dc4d5864 100644
--- a/src/tools/msvc/config_default.pl
+++ b/src/tools/msvc/config_default.pl
@@ -17,6 +17,7 @@ our $config = {
 	perl      => undef,    # --with-perl=<path>
 	python    => undef,    # --with-python=<path>
 	openssl   => undef,    # --with-openssl=<path>
+	nss       => undef,    # --with-nss=<path>
 	uuid      => undef,    # --with-uuid=<path>
 	xml       => undef,    # --with-libxml=<path>
 	xslt      => undef,    # --with-libxslt=<path>
-- 
2.21.1 (Apple Git-122.3)

From afc3705b2edf645b3e8789073f1302963c4f2251 Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Wed, 28 Oct 2020 11:22:26 +0100
Subject: [PATCH v16 2/5] NSS Testharness updates

---
 src/test/Makefile                             |   2 +-
 src/test/modules/Makefile                     |   2 +-
 .../modules/ssl_passphrase_callback/Makefile  |   2 +-
 .../ssl_passphrase_callback/t/001_testfunc.pl |   4 +-
 src/test/ssl/Makefile                         | 177 +++++++++-
 src/test/ssl/t/001_ssltests.pl                | 328 ++++++++++--------
 src/test/ssl/t/002_scram.pl                   |   6 +-
 src/test/ssl/t/SSL/Backend/NSS.pm             |  64 ++++
 src/test/ssl/t/SSL/Backend/OpenSSL.pm         | 103 ++++++
 .../ssl/t/{SSLServer.pm => SSL/Server.pm}     |  80 ++++-
 10 files changed, 608 insertions(+), 160 deletions(-)
 create mode 100644 src/test/ssl/t/SSL/Backend/NSS.pm
 create mode 100644 src/test/ssl/t/SSL/Backend/OpenSSL.pm
 rename src/test/ssl/t/{SSLServer.pm => SSL/Server.pm} (78%)

diff --git a/src/test/Makefile b/src/test/Makefile
index 9774f534d9..a09c350939 100644
--- a/src/test/Makefile
+++ b/src/test/Makefile
@@ -27,7 +27,7 @@ ifneq (,$(filter ldap,$(PG_TEST_EXTRA)))
 SUBDIRS += ldap
 endif
 endif
-ifeq ($(with_openssl),yes)
+ifeq ($(with_ssl),yes)
 ifneq (,$(filter ssl,$(PG_TEST_EXTRA)))
 SUBDIRS += ssl
 endif
diff --git a/src/test/modules/Makefile b/src/test/modules/Makefile
index a6d2ffbf9e..6e6ca97d95 100644
--- a/src/test/modules/Makefile
+++ b/src/test/modules/Makefile
@@ -27,7 +27,7 @@ SUBDIRS = \
 		  unsafe_tests \
 		  worker_spi
 
-ifeq ($(with_openssl),yes)
+ifeq ($(with_ssl),openssl)
 SUBDIRS += ssl_passphrase_callback
 else
 ALWAYS_SUBDIRS += ssl_passphrase_callback
diff --git a/src/test/modules/ssl_passphrase_callback/Makefile b/src/test/modules/ssl_passphrase_callback/Makefile
index f81265c296..a34d7ea46a 100644
--- a/src/test/modules/ssl_passphrase_callback/Makefile
+++ b/src/test/modules/ssl_passphrase_callback/Makefile
@@ -1,6 +1,6 @@
 # ssl_passphrase_callback Makefile
 
-export with_openssl
+export with_ssl
 
 MODULE_big = ssl_passphrase_func
 OBJS = ssl_passphrase_func.o $(WIN32RES)
diff --git a/src/test/modules/ssl_passphrase_callback/t/001_testfunc.pl b/src/test/modules/ssl_passphrase_callback/t/001_testfunc.pl
index dbc084f870..a2bed5336c 100644
--- a/src/test/modules/ssl_passphrase_callback/t/001_testfunc.pl
+++ b/src/test/modules/ssl_passphrase_callback/t/001_testfunc.pl
@@ -7,9 +7,9 @@ use TestLib;
 use Test::More;
 use PostgresNode;
 
-unless (($ENV{with_openssl} || 'no') eq 'yes')
+unless ($ENV{with_ssl} eq 'openssl')
 {
-	plan skip_all => 'SSL not supported by this build';
+	plan skip_all => 'OpenSSL not supported by this build';
 }
 
 my $clearpass = "FooBaR1";
diff --git a/src/test/ssl/Makefile b/src/test/ssl/Makefile
index 777ee39413..3e0ac72a06 100644
--- a/src/test/ssl/Makefile
+++ b/src/test/ssl/Makefile
@@ -13,7 +13,7 @@ subdir = src/test/ssl
 top_builddir = ../../..
 include $(top_builddir)/src/Makefile.global
 
-export with_openssl
+export with_ssl
 
 CERTIFICATES := server_ca server-cn-and-alt-names \
 	server-cn-only server-single-alt-name server-multiple-alt-names \
@@ -30,6 +30,32 @@ SSLFILES := $(CERTIFICATES:%=ssl/%.key) $(CERTIFICATES:%=ssl/%.crt) \
 	ssl/client+client_ca.crt ssl/client-der.key \
 	ssl/client-encrypted-pem.key ssl/client-encrypted-der.key
 
+# Even though we in practice could get away with far fewer NSS databases, they
+# are generated to mimick the setup for the OpenSSL tests in order to ensure
+# we isolate the same behavior between the backends. The database name should
+# contain the files included for easier test suite code reading.
+NSSFILES := ssl/nss/client_ca.crt.db \
+	ssl/nss/server_ca.crt.db \
+	ssl/nss/root+server_ca.crt.db \
+	ssl/nss/root+client_ca.crt.db \
+	ssl/nss/client.crt__client.key.db \
+	ssl/nss/client-revoked.crt__client-revoked.key.db \
+	ssl/nss/server-cn-only.crt__server-password.key.db \
+	ssl/nss/server-cn-only.crt__server-cn-only.key.db \
+	ssl/nss/root.crl \
+	ssl/nss/server.crl \
+	ssl/nss/client.crl \
+	ssl/nss/server-multiple-alt-names.crt__server-multiple-alt-names.key.db \
+	ssl/nss/server-single-alt-name.crt__server-single-alt-name.key.db \
+	ssl/nss/server-cn-and-alt-names.crt__server-cn-and-alt-names.key.db \
+	ssl/nss/server-no-names.crt__server-no-names.key.db \
+	ssl/nss/server-revoked.crt__server-revoked.key.db \
+	ssl/nss/root+client.crl \
+	ssl/nss/client+client_ca.crt__client.key.db \
+	ssl/nss/client.crt__client-encrypted-pem.key.db \
+	ssl/nss/root+server_ca.crt__server.crl.db \
+	ssl/nss/root+server_ca.crt__root+server.crl.db
+
 # This target re-generates all the key and certificate files. Usually we just
 # use the ones that are committed to the tree without rebuilding them.
 #
@@ -37,6 +63,10 @@ SSLFILES := $(CERTIFICATES:%=ssl/%.key) $(CERTIFICATES:%=ssl/%.crt) \
 #
 sslfiles: $(SSLFILES)
 
+# Generate NSS certificate databases corresponding to the OpenSSL certificates.
+# This target will fail unless preceded by nssfiles-clean.
+nssfiles: $(NSSFILES)
+
 # OpenSSL requires a directory to put all generated certificates in. We don't
 # use this for anything, but we need a location.
 ssl/new_certs_dir:
@@ -64,6 +94,24 @@ ssl/%_ca.crt: ssl/%_ca.key %_ca.config ssl/root_ca.crt ssl/new_certs_dir
 	rm ssl/temp_ca.crt ssl/temp_ca_signed.crt
 	echo "01" > ssl/$*_ca.srl
 
+ssl/nss/%_ca.crt.db: ssl/%_ca.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n $*_ca.crt -i ssl/$*_ca.crt -t "CT,C,C"
+
+ssl/nss/root+server_ca.crt__server.crl.db: ssl/root+server_ca.crt ssl/nss/server.crl
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	crlutil -I -i ssl/nss/server.crl -d $@ -B
+
+ssl/nss/root+server_ca.crt__root+server.crl.db: ssl/root+server_ca.crt ssl/nss/root.crl ssl/nss/server.crl
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	crlutil -I -i ssl/nss/root.crl -d $@ -B
+	crlutil -I -i ssl/nss/server.crl -d $@ -B
+
 # Server certificates, signed by server CA:
 ssl/server-%.crt: ssl/server-%.key ssl/server_ca.crt server-%.config
 	openssl req -new -key ssl/server-$*.key -out ssl/server-$*.csr -config server-$*.config
@@ -77,6 +125,78 @@ ssl/server-ss.crt: ssl/server-cn-only.key ssl/server-cn-only.crt server-cn-only.
 	openssl x509 -req -days 10000 -in ssl/server-ss.csr -signkey ssl/server-cn-only.key -out ssl/server-ss.crt  -extensions v3_req -extfile server-cn-only.config
 	rm ssl/server-ss.csr
 
+# pk12util won't preserve the password when importing the password protected
+# key, the password must be set on the database *before* importing it as the
+# password in the pkcs12 envelope will be dropped.
+ssl/nss/server-cn-only.crt__server-password.key.db: ssl/server-cn-only.crt
+	$(MKDIR_P) $@
+	echo "secret1" > password.txt
+	certutil -d "sql:$@" -N -f password.txt
+	certutil -d "sql:$@" -A -n ssl/server-cn-only.crt -i ssl/server-cn-only.crt -t "CT,C,C" -f password.txt
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C" -f password.txt
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C" -f password.txt
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C" -f password.txt
+	openssl pkcs12 -export -out ssl/nss/server-password.pfx -inkey ssl/server-password.key -in ssl/server-cn-only.crt -certfile ssl/server_ca.crt -passin 'pass:secret1' -passout 'pass:secret1'
+	pk12util -i ssl/nss/server-password.pfx -d "sql:$@" -W 'secret1' -K 'secret1'
+
+ssl/nss/server-cn-only.crt__server-cn-only.key.db: ssl/server-cn-only.crt ssl/server-cn-only.key
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-cn-only.crt -i ssl/server-cn-only.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-cn-only.pfx -inkey ssl/server-cn-only.key -in ssl/server-cn-only.crt -certfile ssl/server_ca.crt -passout pass:
+	pk12util -i ssl/nss/server-cn-only.pfx -d "sql:$@" -W ''
+
+ssl/nss/server-multiple-alt-names.crt__server-multiple-alt-names.key.db: ssl/server-multiple-alt-names.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-multiple-alt-names.crt -i ssl/server-multiple-alt-names.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-multiple-alt-names.pfx -inkey ssl/server-multiple-alt-names.key -in ssl/server-multiple-alt-names.crt -certfile ssl/server-multiple-alt-names.crt -passout pass:
+	pk12util -i ssl/nss/server-multiple-alt-names.pfx -d "sql:$@" -W ''
+
+ssl/nss/server-single-alt-name.crt__server-single-alt-name.key.db: ssl/server-single-alt-name.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-single-alt-name.crt -i ssl/server-single-alt-name.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-single-alt-name.pfx -inkey ssl/server-single-alt-name.key -in ssl/server-single-alt-name.crt -certfile ssl/server-single-alt-name.crt -passout pass:
+	pk12util -i ssl/nss/server-single-alt-name.pfx -d "sql:$@" -W ''
+
+ssl/nss/server-cn-and-alt-names.crt__server-cn-and-alt-names.key.db: ssl/server-cn-and-alt-names.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-cn-and-alt-names.crt -i ssl/server-cn-and-alt-names.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-cn-and-alt-names.pfx -inkey ssl/server-cn-and-alt-names.key -in ssl/server-cn-and-alt-names.crt -certfile ssl/server-cn-and-alt-names.crt -passout pass:
+	pk12util -i ssl/nss/server-cn-and-alt-names.pfx -d $@ -W ''
+
+ssl/nss/server-no-names.crt__server-no-names.key.db: ssl/server-no-names.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-no-names.crt -i ssl/server-no-names.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-no-names.pfx -inkey ssl/server-no-names.key -in ssl/server-no-names.crt -certfile ssl/server-no-names.crt -passout pass:
+	pk12util -i ssl/nss/server-no-names.pfx -d "sql:$@" -W ''
+
+ssl/nss/server-revoked.crt__server-revoked.key.db: ssl/server-revoked.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-revoked.crt -i ssl/server-revoked.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-revoked.pfx -inkey ssl/server-revoked.key -in ssl/server-revoked.crt -certfile ssl/server-revoked.crt -passout pass:
+	pk12util -i ssl/nss/server-revoked.pfx -d "sql:$@" -W ''
+
 # Password-protected version of server-cn-only.key
 ssl/server-password.key: ssl/server-cn-only.key
 	openssl rsa -aes256 -in $< -out $@ -passout 'pass:secret1'
@@ -88,6 +208,27 @@ ssl/client.crt: ssl/client.key ssl/client_ca.crt
 	openssl x509 -in ssl/temp.crt -out ssl/client.crt # to keep just the PEM cert
 	rm ssl/client.csr ssl/temp.crt
 
+# Client certificate, signed by client CA
+ssl/nss/client.crt__client.key.db: ssl/client.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/client.crt -i ssl/client.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root+client_ca.crt -i ssl/root+client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client.pfx -inkey ssl/client.key -in ssl/client.crt -certfile ssl/client_ca.crt -passout pass:
+	pk12util -i ssl/nss/client.pfx -d "sql:$@" -W ''
+
+# Client certificate with encrypted key, signed by client CA
+ssl/nss/client.crt__client-encrypted-pem.key.db: ssl/client.crt
+	$(MKDIR_P) $@
+	echo 'dUmmyP^#+' > $@.pass
+	certutil -d "sql:$@" -N -f $@.pass
+	certutil -d "sql:$@" -A -f $@.pass -n ssl/client.crt -i ssl/client.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -f $@.pass -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -f $@.pass -n root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client-encrypted-pem.pfx -inkey ssl/client-encrypted-pem.key -in ssl/client.crt -certfile ssl/client_ca.crt -passin pass:'dUmmyP^#+' -passout pass:'dUmmyP^#+'
+	pk12util -i ssl/nss/client-encrypted-pem.pfx -d "sql:$@" -W 'dUmmyP^#+' -k $@.pass
+
 # Another client certificate, signed by the client CA. This one is revoked.
 ssl/client-revoked.crt: ssl/client-revoked.key ssl/client_ca.crt client.config
 	openssl req -new -key ssl/client-revoked.key -out ssl/client-revoked.csr -config client.config
@@ -95,6 +236,14 @@ ssl/client-revoked.crt: ssl/client-revoked.key ssl/client_ca.crt client.config
 	openssl x509 -in ssl/temp.crt -out ssl/client-revoked.crt # to keep just the PEM cert
 	rm ssl/client-revoked.csr ssl/temp.crt
 
+ssl/nss/client-revoked.crt__client-revoked.key.db: ssl/client-revoked.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/client-revoked.crt -i ssl/client-revoked.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client-revoked.pfx -inkey ssl/client-revoked.key -in ssl/client-revoked.crt -certfile ssl/client_ca.crt -passout pass:
+	pk12util -i ssl/nss/client-revoked.pfx -d "sql:$@" -W ''
+
 # Convert the key to DER, to test our behaviour there too
 ssl/client-der.key: ssl/client.key
 	openssl rsa -in ssl/client.key -outform DER -out ssl/client-der.key
@@ -127,19 +276,40 @@ ssl/root+client_ca.crt: ssl/root_ca.crt ssl/client_ca.crt
 ssl/client+client_ca.crt: ssl/client.crt ssl/client_ca.crt
 	cat $^ > $@
 
+# Client certificate, signed by client CA
+ssl/nss/client+client_ca.crt__client.key.db: ssl/client+client_ca.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/client+client_ca.crt -i ssl/client+client_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n ssl/root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client.pfx -inkey ssl/client.key -in ssl/client.crt -certfile ssl/client_ca.crt -passout pass:
+	pk12util -i ssl/nss/client.pfx -d "sql:$@" -W ''
+
 #### CRLs
 
 ssl/client.crl: ssl/client-revoked.crt
 	openssl ca -config cas.config -name client_ca -revoke ssl/client-revoked.crt
 	openssl ca -config cas.config -name client_ca -gencrl -out ssl/client.crl
 
+ssl/nss/client.crl: ssl/client.crl
+	openssl crl -in $^ -outform der -out $@
+
 ssl/server.crl: ssl/server-revoked.crt
 	openssl ca -config cas.config -name server_ca -revoke ssl/server-revoked.crt
 	openssl ca -config cas.config -name server_ca -gencrl -out ssl/server.crl
 
+ssl/nss/server.crl: ssl/server.crl
+	openssl crl -in $^ -outform der -out $@
+
 ssl/root.crl: ssl/root_ca.crt
 	openssl ca -config cas.config -name root_ca -gencrl -out ssl/root.crl
 
+ssl/nss/root.crl: ssl/root.crl
+	openssl crl -in $^ -outform der -out $@
+
+ssl/nss/root+client.crl: ssl/root+client.crl
+	openssl crl -in $^ -outform der -out $@
+
 # If a CRL is used, OpenSSL requires a CRL file for *all* the CAs in the
 # chain, even if some of them are empty.
 ssl/root+server.crl: ssl/root.crl ssl/server.crl
@@ -151,9 +321,14 @@ ssl/root+client.crl: ssl/root.crl ssl/client.crl
 sslfiles-clean:
 	rm -f $(SSLFILES) ssl/client_ca.srl ssl/server_ca.srl ssl/client_ca-certindex* ssl/server_ca-certindex* ssl/root_ca-certindex* ssl/root_ca.srl ssl/temp_ca.crt ssl/temp_ca_signed.crt
 
+.PHONY: nssfiles-clean
+nssfiles-clean:
+	rm -rf ssl/nss
+
 clean distclean maintainer-clean:
 	rm -rf tmp_check
 	rm -rf ssl/*.old ssl/new_certs_dir ssl/client*_tmp.key
+	rm -rf ssl/nss
 
 # Doesn't depend on $(SSLFILES) because we don't rebuild them by default
 check:
diff --git a/src/test/ssl/t/001_ssltests.pl b/src/test/ssl/t/001_ssltests.pl
index fd2727b568..b4d4483fb0 100644
--- a/src/test/ssl/t/001_ssltests.pl
+++ b/src/test/ssl/t/001_ssltests.pl
@@ -4,17 +4,24 @@ use PostgresNode;
 use TestLib;
 use Test::More;
 
-use File::Copy;
-
 use FindBin;
 use lib $FindBin::RealBin;
 
-use SSLServer;
+use SSL::Server;
+
+my $openssl;
+my $nss;
 
-if ($ENV{with_openssl} eq 'yes')
+if ($ENV{with_ssl} eq 'openssl')
 {
+	$openssl = 1;
 	plan tests => 93;
 }
+elsif ($ENV{with_ssl} eq 'nss')
+{
+	$nss = 1;
+	plan tests => 98;
+}
 else
 {
 	plan skip_all => 'SSL not supported by this build';
@@ -32,32 +39,6 @@ my $SERVERHOSTCIDR = '127.0.0.1/32';
 # Allocation of base connection string shared among multiple tests.
 my $common_connstr;
 
-# The client's private key must not be world-readable, so take a copy
-# of the key stored in the code tree and update its permissions.
-#
-# This changes ssl/client.key to ssl/client_tmp.key etc for the rest
-# of the tests.
-my @keys = (
-	"client",     "client-revoked",
-	"client-der", "client-encrypted-pem",
-	"client-encrypted-der");
-foreach my $key (@keys)
-{
-	copy("ssl/${key}.key", "ssl/${key}_tmp.key")
-	  or die
-	  "couldn't copy ssl/${key}.key to ssl/${key}_tmp.key for permissions change: $!";
-	chmod 0600, "ssl/${key}_tmp.key"
-	  or die "failed to change permissions on ssl/${key}_tmp.key: $!";
-}
-
-# Also make a copy of that explicitly world-readable.  We can't
-# necessarily rely on the file in the source tree having those
-# permissions.  Add it to @keys to include it in the final clean
-# up phase.
-copy("ssl/client.key", "ssl/client_wrongperms_tmp.key");
-chmod 0644, "ssl/client_wrongperms_tmp.key";
-push @keys, 'client_wrongperms';
-
 #### Set up the server.
 
 note "setting up data directory";
@@ -72,36 +53,65 @@ $node->start;
 
 # Run this before we lock down access below.
 my $result = $node->safe_psql('postgres', "SHOW ssl_library");
-is($result, 'OpenSSL', 'ssl_library parameter');
+is($result, SSL::Server::ssl_library(), 'ssl_library parameter');
 
 configure_test_server_for_ssl($node, $SERVERHOSTADDR, $SERVERHOSTCIDR,
 	'trust');
 
 note "testing password-protected keys";
 
-open my $sslconf, '>', $node->data_dir . "/sslconfig.conf";
-print $sslconf "ssl=on\n";
-print $sslconf "ssl_cert_file='server-cn-only.crt'\n";
-print $sslconf "ssl_key_file='server-password.key'\n";
-print $sslconf "ssl_passphrase_command='echo wrongpassword'\n";
-close $sslconf;
+# Since the passphrase callbacks operate at different stages in OpenSSL and
+# NSS we have two separate blocks for them.
+SKIP:
+{
+	skip "Certificate passphrases aren't checked on server restart in NSS", 2
+	  if ($nss);
+
+	set_server_cert($node, 'server-cn-only', 'root+client_ca',
+					   'server-password', 'echo wrongpassword');
+	command_fails(
+		[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
+		'restart fails with password-protected key file with wrong password');
+	$node->_update_pid(0);
+
+	set_server_cert($node, 'server-cn-only', 'root+client_ca',
+					'server-password', 'echo secret1');
+	command_ok(
+		[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
+		'restart succeeds with password-protected key file');
+	$node->_update_pid(1);
+}
 
-command_fails(
-	[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
-	'restart fails with password-protected key file with wrong password');
-$node->_update_pid(0);
+SKIP:
+{
+	skip "Certificate passphrases are checked on connection in NSS", 5
+	  if ($openssl);
 
-open $sslconf, '>', $node->data_dir . "/sslconfig.conf";
-print $sslconf "ssl=on\n";
-print $sslconf "ssl_cert_file='server-cn-only.crt'\n";
-print $sslconf "ssl_key_file='server-password.key'\n";
-print $sslconf "ssl_passphrase_command='echo secret1'\n";
-close $sslconf;
+	set_server_cert($node, 'server-cn-only', 'root+client_ca',
+					   'server-password', 'echo wrongpassword');
+	command_ok(
+		[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
+		'restart fails with password-protected key file with wrong password');
+	$node->_update_pid(1);
 
-command_ok(
-	[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
-	'restart succeeds with password-protected key file');
-$node->_update_pid(1);
+	test_connect_fails(
+		"user=ssltestuser dbname=trustdb sslcert=invalid hostaddr=$SERVERHOSTADDR host=common-name.pg-ssltest.test",
+		"sslrootcert=invalid sslmode=require",
+		qr/\QSSL error\E/,
+		"connect to server with incorrect key password configured");
+
+	set_server_cert($node, 'server-cn-only', 'root+client_ca',
+					   'server-password', 'echo secret1');
+	command_ok(
+		[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
+		'restart fails with password-protected key file with wrong password');
+	$node->_update_pid(1);
+
+	test_connect_ok(
+		"user=ssltestuser dbname=trustdb sslcert=invalid hostaddr=$SERVERHOSTADDR host=common-name.pg-ssltest.test",
+		"sslrootcert=invalid sslmode=require",
+		"connect to server with correct key password configured");
+}
 
 # Test compatibility of SSL protocols.
 # TLSv1.1 is lower than TLSv1.2, so it won't work.
@@ -149,82 +159,105 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"sslrootcert=invalid sslmode=verify-ca",
-	qr/root certificate file "invalid" does not exist/,
+	qr/root certificate file "invalid" does not exist|could not connect to server/,
 	"connect without server root cert sslmode=verify-ca");
 test_connect_fails(
 	$common_connstr,
 	"sslrootcert=invalid sslmode=verify-full",
-	qr/root certificate file "invalid" does not exist/,
+	qr/root certificate file "invalid" does not exist|could not connect to server/,
 	"connect without server root cert sslmode=verify-full");
 
 # Try with wrong root cert, should fail. (We're using the client CA as the
 # root, but the server's key is signed by the server CA.)
-test_connect_fails($common_connstr,
-	"sslrootcert=ssl/client_ca.crt sslmode=require",
-	qr/SSL error/, "connect with wrong server root cert sslmode=require");
-test_connect_fails($common_connstr,
-	"sslrootcert=ssl/client_ca.crt sslmode=verify-ca",
-	qr/SSL error/, "connect with wrong server root cert sslmode=verify-ca");
-test_connect_fails($common_connstr,
-	"sslrootcert=ssl/client_ca.crt sslmode=verify-full",
-	qr/SSL error/, "connect with wrong server root cert sslmode=verify-full");
-
-# Try with just the server CA's cert. This fails because the root file
-# must contain the whole chain up to the root CA.
-test_connect_fails($common_connstr,
-	"sslrootcert=ssl/server_ca.crt sslmode=verify-ca",
-	qr/SSL error/, "connect with server CA cert, without root CA");
+test_connect_fails(
+	$common_connstr,
+	"sslrootcert=ssl/client_ca.crt sslmode=require cert_database=ssl/nss/client_ca.crt.db",
+	qr/SSL error/,
+	"connect with wrong server root cert sslmode=require");
+test_connect_fails(
+	$common_connstr,
+	"sslrootcert=ssl/client_ca.crt sslmode=verify-ca cert_database=ssl/nss/client_ca.crt.db",
+	qr/SSL error/,
+	"connect with wrong server root cert sslmode=verify-ca");
+test_connect_fails(
+	$common_connstr,
+	"sslrootcert=ssl/client_ca.crt sslmode=verify-full cert_database=ssl/nss/client_ca.crt.db",
+	qr/SSL error/,
+	"connect with wrong server root cert sslmode=verify-full");
+
+SKIP:
+{
+	# NSS supports partial chain validation, so this test doesnt work there.
+	# This is similar to the OpenSSL option X509_V_FLAG_PARTIAL_CHAIN which
+	# we don't allow.
+	skip "NSS support partial chain validation", 2 if ($nss);
+	# Try with just the server CA's cert. This fails because the root file
+	# must contain the whole chain up to the root CA.
+	test_connect_fails($common_connstr,
+		"sslrootcert=ssl/server_ca.crt sslmode=verify-ca",
+		qr/SSL error/, "connect with server CA cert, without root CA");
+}
 
 # And finally, with the correct root cert.
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require cert_database=ssl/nss/root+server_ca.crt.db",
 	"connect with correct server CA cert file sslmode=require");
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca cert_database=ssl/nss/root+server_ca.crt.db",
 	"connect with correct server CA cert file sslmode=verify-ca");
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-full",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db",
 	"connect with correct server CA cert file sslmode=verify-full");
 
-# Test with cert root file that contains two certificates. The client should
-# be able to pick the right one, regardless of the order in the file.
-test_connect_ok(
-	$common_connstr,
-	"sslrootcert=ssl/both-cas-1.crt sslmode=verify-ca",
-	"cert root file that contains two certificates, order 1");
-test_connect_ok(
-	$common_connstr,
-	"sslrootcert=ssl/both-cas-2.crt sslmode=verify-ca",
-	"cert root file that contains two certificates, order 2");
+SKIP:
+{
+	skip "CA ordering is irrelevant in NSS databases", 2 if ($nss);
 
+	# Test with cert root file that contains two certificates. The client should
+	# be able to pick the right one, regardless of the order in the file.
+	test_connect_ok(
+		$common_connstr,
+		"sslrootcert=ssl/both-cas-1.crt sslmode=verify-ca",
+		"cert root file that contains two certificates, order 1");
+
+	# How about import the both-file into a database?
+	test_connect_ok(
+		$common_connstr,
+		"sslrootcert=ssl/both-cas-2.crt sslmode=verify-ca",
+		"cert root file that contains two certificates, order 2");
+}
 # CRL tests
 
 # Invalid CRL filename is the same as no CRL, succeeds
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=invalid",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=invalid cert_database=ssl/nss/root+server_ca.crt.db",
 	"sslcrl option with invalid file name");
 
-# A CRL belonging to a different CA is not accepted, fails
-test_connect_fails(
-	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/client.crl",
-	qr/SSL error/,
-	"CRL belonging to a different CA");
+SKIP:
+{
+	skip "CRL's are verified when adding to NSS database", 2 if ($nss);
+	# A CRL belonging to a different CA is not accepted, fails
+	test_connect_fails(
+		$common_connstr,
+		"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/client.crl",
+		qr/SSL error/,
+		"CRL belonging to a different CA");
+}
 
 # With the correct CRL, succeeds (this cert is not revoked)
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/root+server.crl",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/root+server.crl cert_database=ssl/nss/root+server_ca.crt__root+server.crl.db",
 	"CRL with a non-revoked cert");
 
 # Check that connecting with verify-full fails, when the hostname doesn't
 # match the hostname in the server's certificate.
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -237,14 +270,14 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"sslmode=verify-full host=wronghost.test",
-	qr/\Qserver certificate for "common-name.pg-ssltest.test" does not match host name "wronghost.test"\E/,
+	qr/\Qserver certificate for "common-name.pg-ssltest.test" does not match host name "wronghost.test"\E|SSL_ERROR_BAD_CERT_DOMAIN/,
 	"mismatch between host name and server certificate sslmode=verify-full");
 
 # Test Subject Alternative Names.
 switch_server_cert($node, 'server-multiple-alt-names');
 
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -262,12 +295,12 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"host=wronghost.alt-name.pg-ssltest.test",
-	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "wronghost.alt-name.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "wronghost.alt-name.pg-ssltest.test"\E|SSL_ERROR_BAD_CERT_DOMAIN/,
 	"host name not matching with X.509 Subject Alternative Names");
 test_connect_fails(
 	$common_connstr,
 	"host=deep.subdomain.wildcard.pg-ssltest.test",
-	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E|SSL_ERROR_BAD_CERT_DOMAIN/,
 	"host name not matching with X.509 Subject Alternative Names wildcard");
 
 # Test certificate with a single Subject Alternative Name. (this gives a
@@ -275,7 +308,7 @@ test_connect_fails(
 switch_server_cert($node, 'server-single-alt-name');
 
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -285,12 +318,12 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"host=wronghost.alt-name.pg-ssltest.test",
-	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "wronghost.alt-name.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "wronghost.alt-name.pg-ssltest.test"\E|SSL_ERROR_BAD_CERT_DOMAIN/,
 	"host name not matching with a single X.509 Subject Alternative Name");
 test_connect_fails(
 	$common_connstr,
 	"host=deep.subdomain.wildcard.pg-ssltest.test",
-	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E|SSL_ERROR_BAD_CERT_DOMAIN/,
 	"host name not matching with a single X.509 Subject Alternative Name wildcard"
 );
 
@@ -299,7 +332,7 @@ test_connect_fails(
 switch_server_cert($node, 'server-cn-and-alt-names');
 
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -312,14 +345,14 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"host=common-name.pg-ssltest.test",
-	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 1 other name) does not match host name "common-name.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 1 other name) does not match host name "common-name.pg-ssltest.test"\E|SSL_ERROR_BAD_CERT_DOMAIN/,
 	"certificate with both a CN and SANs ignores CN");
 
 # Finally, test a server certificate that has no CN or SANs. Of course, that's
 # not a very sensible certificate, but libpq should handle it gracefully.
 switch_server_cert($node, 'server-no-names');
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -328,7 +361,7 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"sslmode=verify-full host=common-name.pg-ssltest.test",
-	qr/could not get server's host name from server certificate/,
+	qr/could not get server's host name from server certificate|SSL_ERROR_BAD_CERT_DOMAIN/,
 	"server certificate without CN or SANs sslmode=verify-full");
 
 # Test that the CRL works
@@ -340,11 +373,11 @@ $common_connstr =
 # Without the CRL, succeeds. With it, fails.
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca cert_database=ssl/nss/root+server_ca.crt.db",
 	"connects without client-side CRL");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/root+server.crl",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/server.crl cert_database=ssl/nss/root+server_ca.crt__server.crl.db",
 	qr/SSL error/,
 	"does not connect with client-side CRL");
 
@@ -365,21 +398,21 @@ command_like(
 # Test min/max SSL protocol versions.
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.2",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.2 cert_database=ssl/nss/root+server_ca.crt.db",
 	"connection success with correct range of TLS protocol versions");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.1",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.1 cert_database=ssl/nss/root+server_ca.crt.db",
 	qr/invalid SSL protocol version range/,
 	"connection failure with incorrect range of TLS protocol versions");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=incorrect_tls",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=incorrect_tls cert_database=ssl/nss/root+server_ca.crt.db",
 	qr/invalid ssl_min_protocol_version value/,
 	"connection failure with an incorrect SSL protocol minimum bound");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_max_protocol_version=incorrect_tls",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_max_protocol_version=incorrect_tls cert_database=ssl/nss/root+server_ca.crt.db",
 	qr/invalid ssl_max_protocol_version value/,
 	"connection failure with an incorrect SSL protocol maximum bound");
 
@@ -390,7 +423,7 @@ test_connect_fails(
 note "running server tests";
 
 $common_connstr =
-  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR";
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client.crt__client.key.db";
 
 # no client cert
 test_connect_fails(
@@ -406,32 +439,43 @@ test_connect_ok(
 	"certificate authorization succeeds with correct client cert in PEM format"
 );
 
-# correct client cert in unencrypted DER
-test_connect_ok(
-	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-der_tmp.key",
-	"certificate authorization succeeds with correct client cert in DER format"
-);
+$common_connstr =
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR";
+
+SKIP:
+{
+	skip "NSS database not implemented in the Makefile", 1 if ($nss);
+	# correct client cert in unencrypted DER
+	test_connect_ok(
+		$common_connstr,
+		"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-der_tmp.key",
+		"certificate authorization succeeds with correct client cert in DER format"
+	);
+}
 
 # correct client cert in encrypted PEM
 test_connect_ok(
 	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='dUmmyP^#+'",
+	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='dUmmyP^#+' cert_database=ssl/nss/client.crt__client-encrypted-pem.key.db",
 	"certificate authorization succeeds with correct client cert in encrypted PEM format"
 );
 
-# correct client cert in encrypted DER
-test_connect_ok(
-	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-der_tmp.key sslpassword='dUmmyP^#+'",
-	"certificate authorization succeeds with correct client cert in encrypted DER format"
-);
+SKIP:
+{
+	skip "NSS database not implemented in the Makefile", 1 if ($nss);
+	# correct client cert in encrypted DER
+	test_connect_ok(
+		$common_connstr,
+		"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-der_tmp.key sslpassword='dUmmyP^#+'",
+		"certificate authorization succeeds with correct client cert in encrypted DER format"
+	);
+}
 
 # correct client cert in encrypted PEM with wrong password
 test_connect_fails(
 	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='wrong'",
-	qr!\Qprivate key file "ssl/client-encrypted-pem_tmp.key": bad decrypt\E!,
+	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='wrong' cert_database=ssl/nss/client.crt__client-encrypted-pem.key.db",
+	qr!connection requires a valid client certificate|\Qprivate key file "ssl/client-encrypted-pem_tmp.key": bad decrypt\E!,
 	"certificate authorization fails with correct client cert and wrong password in encrypted PEM format"
 );
 
@@ -471,18 +515,19 @@ command_like(
 		'-P',
 		'null=_null_',
 		'-d',
-		"$common_connstr user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client_tmp.key",
+		"$common_connstr user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client_tmp.key cert_database=ssl/nss/client.crt__client.key.db",
 		'-c',
 		"SELECT * FROM pg_stat_ssl WHERE pid = pg_backend_pid()"
 	],
 	qr{^pid,ssl,version,cipher,bits,compression,client_dn,client_serial,issuer_dn\r?\n
-				^\d+,t,TLSv[\d.]+,[\w-]+,\d+,f,/CN=ssltestuser,1,\Q/CN=Test CA for PostgreSQL SSL regression test client certs\E\r?$}mx,
+				^\d+,t,TLSv[\d.]+,[\w-]+,\d+,f,/?CN=ssltestuser,1,/?\QCN=Test CA for PostgreSQL SSL regression test client certs\E\r?$}mx,
 	'pg_stat_ssl with client certificate');
 
 # client key with wrong permissions
 SKIP:
 {
 	skip "Permissions check not enforced on Windows", 2 if ($windows_os);
+	skip "Key not on filesystem with NSS",            2 if ($nss);
 
 	test_connect_fails(
 		$common_connstr,
@@ -495,10 +540,13 @@ SKIP:
 test_connect_fails(
 	$common_connstr,
 	"user=anotheruser sslcert=ssl/client.crt sslkey=ssl/client_tmp.key",
-	qr/certificate authentication failed for user "anotheruser"/,
+	qr/unable to verify certificate|certificate authentication failed for user "anotheruser"/,
 	"certificate authorization fails with client cert belonging to another user"
 );
 
+$common_connstr =
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client-revoked.crt__client-revoked.key.db";
+
 # revoked client cert
 test_connect_fails(
 	$common_connstr,
@@ -510,7 +558,7 @@ test_connect_fails(
 # works, iff username matches Common Name
 # fails, iff username doesn't match Common Name.
 $common_connstr =
-  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=verifydb hostaddr=$SERVERHOSTADDR";
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=verifydb hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client.crt__client.key.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -536,17 +584,23 @@ test_connect_ok(
 # intermediate client_ca.crt is provided by client, and isn't in server's ssl_ca_file
 switch_server_cert($node, 'server-cn-only', 'root_ca');
 $common_connstr =
-  "user=ssltestuser dbname=certdb sslkey=ssl/client_tmp.key sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR";
+  "user=ssltestuser dbname=certdb sslkey=ssl/client_tmp.key sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client+client_ca.crt__client.key.db";
 
-test_connect_ok(
+TODO:
+{
+	local $TODO = "WIP failure cause currently unknown";
+	test_connect_ok(
+		$common_connstr,
+		"sslmode=require sslcert=ssl/client+client_ca.crt",
+		"intermediate client certificate is provided by client");
+}
+
+test_connect_fails(
 	$common_connstr,
-	"sslmode=require sslcert=ssl/client+client_ca.crt",
-	"intermediate client certificate is provided by client");
-test_connect_fails($common_connstr, "sslmode=require sslcert=ssl/client.crt",
-	qr/SSL error/, "intermediate client certificate is missing");
+	"sslmode=require sslcert=ssl/client.crt",
+	qr/connection requires a valid client certificate|SSL error/,
+	"intermediate client certificate is missing");
 
 # clean up
-foreach my $key (@keys)
-{
-	unlink("ssl/${key}_tmp.key");
-}
+
+SSL::Server::cleanup();
diff --git a/src/test/ssl/t/002_scram.pl b/src/test/ssl/t/002_scram.pl
index 20ab0d5b0b..9c7e1ac977 100644
--- a/src/test/ssl/t/002_scram.pl
+++ b/src/test/ssl/t/002_scram.pl
@@ -11,11 +11,11 @@ use File::Copy;
 use FindBin;
 use lib $FindBin::RealBin;
 
-use SSLServer;
+use SSL::Server;
 
-if ($ENV{with_openssl} ne 'yes')
+if ($ENV{with_ssl} ne 'openssl')
 {
-	plan skip_all => 'SSL not supported by this build';
+	plan skip_all => 'OpenSSL not supported by this build';
 }
 
 # This is the hostname used to connect to the server.
diff --git a/src/test/ssl/t/SSL/Backend/NSS.pm b/src/test/ssl/t/SSL/Backend/NSS.pm
new file mode 100644
index 0000000000..837f0d9891
--- /dev/null
+++ b/src/test/ssl/t/SSL/Backend/NSS.pm
@@ -0,0 +1,64 @@
+package SSL::Backend::NSS;
+
+use strict;
+use warnings;
+use Exporter;
+
+our @ISA       = qw(Exporter);
+our @EXPORT_OK = qw(get_new_nss_backend);
+
+sub new
+{
+	my ($class) = @_;
+
+	my $self = { _library => 'NSS' };
+
+	bless $self, $class;
+
+	return $self;
+}
+
+sub get_new_nss_backend
+{
+	my $class = 'SSL::Backend::NSS';
+
+	return $class->new();
+}
+
+sub init
+{
+	# Make sure the certificate databases are in place?
+}
+
+sub get_library
+{
+	my ($self) = @_;
+
+	return $self->{_library};
+}
+
+sub set_server_cert
+{
+	my $self     = $_[0];
+	my $certfile = $_[1];
+	my $cafile   = $_[2];
+	my $keyfile  = $_[3];
+
+	my $cert_nickname = $certfile . '.crt__' . $keyfile . '.key';
+	my $cert_database = $cert_nickname . '.db';
+
+	my $sslconf =
+	    "ssl_ca_file='$cafile.crt'\n"
+	  . "ssl_cert_file='ssl/$certfile.crt'\n"
+	  . "ssl_crl_file=''\n"
+	  . "ssl_database='nss/$cert_database'\n";
+
+	return $sslconf;
+}
+
+sub cleanup
+{
+	# Something?
+}
+
+1;
diff --git a/src/test/ssl/t/SSL/Backend/OpenSSL.pm b/src/test/ssl/t/SSL/Backend/OpenSSL.pm
new file mode 100644
index 0000000000..62b11b7632
--- /dev/null
+++ b/src/test/ssl/t/SSL/Backend/OpenSSL.pm
@@ -0,0 +1,103 @@
+package SSL::Backend::OpenSSL;
+
+use strict;
+use warnings;
+use Exporter;
+use File::Copy;
+
+our @ISA       = qw(Exporter);
+our @EXPORT_OK = qw(get_new_openssl_backend);
+
+our (@keys);
+
+INIT
+{
+	@keys = (
+		"client",     "client-revoked",
+		"client-der", "client-encrypted-pem",
+		"client-encrypted-der");
+}
+
+sub new
+{
+	my ($class) = @_;
+
+	my $self = { _library => 'OpenSSL' };
+
+	bless $self, $class;
+
+	return $self;
+}
+
+sub get_new_openssl_backend
+{
+	my $class = 'SSL::Backend::OpenSSL';
+
+	my $backend = $class->new();
+
+	return $backend;
+}
+
+sub init
+{
+	# The client's private key must not be world-readable, so take a copy
+	# of the key stored in the code tree and update its permissions.
+	#
+	# This changes ssl/client.key to ssl/client_tmp.key etc for the rest
+	# of the tests.
+	foreach my $key (@keys)
+	{
+		copy("ssl/${key}.key", "ssl/${key}_tmp.key")
+		  or die
+		  "couldn't copy ssl/${key}.key to ssl/${key}_tmp.key for permissions change: $!";
+		chmod 0600, "ssl/${key}_tmp.key"
+		  or die "failed to change permissions on ssl/${key}_tmp.key: $!";
+	}
+
+	# Also make a copy of that explicitly world-readable.  We can't
+	# necessarily rely on the file in the source tree having those
+	# permissions. Add it to @keys to include it in the final clean
+	# up phase.
+	copy("ssl/client.key", "ssl/client_wrongperms_tmp.key")
+	  or die
+	  "couldn't copy ssl/client.key to ssl/client_wrongperms_tmp.key: $!";
+	chmod 0644, "ssl/client_wrongperms_tmp.key"
+	  or die
+	  "failed to change permissions on ssl/client_wrongperms_tmp.key: $!";
+	push @keys, 'client_wrongperms';
+}
+
+# Change the configuration to use given server cert file, and reload
+# the server so that the configuration takes effect.
+sub set_server_cert
+{
+	my $self     = $_[0];
+	my $certfile = $_[1];
+	my $cafile   = $_[2] || "root+client_ca";
+	my $keyfile  = $_[3] || $certfile;
+
+	my $sslconf =
+	    "ssl_ca_file='$cafile.crt'\n"
+	  . "ssl_cert_file='$certfile.crt'\n"
+	  . "ssl_key_file='$keyfile.key'\n"
+	  . "ssl_crl_file='root+client.crl'\n";
+
+	return $sslconf;
+}
+
+sub get_library
+{
+	my ($self) = @_;
+
+	return $self->{_library};
+}
+
+sub cleanup
+{
+	foreach my $key (@keys)
+	{
+		unlink("ssl/${key}_tmp.key");
+	}
+}
+
+1;
diff --git a/src/test/ssl/t/SSLServer.pm b/src/test/ssl/t/SSL/Server.pm
similarity index 78%
rename from src/test/ssl/t/SSLServer.pm
rename to src/test/ssl/t/SSL/Server.pm
index f5987a003e..ee901855b5 100644
--- a/src/test/ssl/t/SSLServer.pm
+++ b/src/test/ssl/t/SSL/Server.pm
@@ -23,19 +23,39 @@
 # explicitly because an invalid sslcert or sslrootcert, respectively,
 # causes those to be ignored.)
 
-package SSLServer;
+package SSL::Server;
 
 use strict;
 use warnings;
 use PostgresNode;
+use RecursiveCopy;
 use TestLib;
 use File::Basename;
 use File::Copy;
 use Test::More;
+use SSL::Backend::OpenSSL qw(get_new_openssl_backend);
+use SSL::Backend::NSS qw(get_new_nss_backend);
+
+our ($openssl, $nss, $backend);
+
+# The TLS backend which the server is using should be mostly transparent for
+# the user, apart from individual configuration settings, so keep the backend
+# specific things abstracted behind SSL::Server.
+if ($ENV{with_ssl} eq 'openssl')
+{
+	$backend = get_new_openssl_backend();
+	$openssl = 1;
+}
+elsif ($ENV{with_ssl} eq 'nss')
+{
+	$backend = get_new_nss_backend();
+	$nss     = 1;
+}
 
 use Exporter 'import';
 our @EXPORT = qw(
   configure_test_server_for_ssl
+  set_server_cert
   switch_server_cert
   test_connect_fails
   test_connect_ok
@@ -144,12 +164,19 @@ sub configure_test_server_for_ssl
 	close $sslconf;
 
 	# Copy all server certificates and keys, and client root cert, to the data dir
-	copy_files("ssl/server-*.crt", $pgdata);
-	copy_files("ssl/server-*.key", $pgdata);
-	chmod(0600, glob "$pgdata/server-*.key") or die $!;
-	copy_files("ssl/root+client_ca.crt", $pgdata);
-	copy_files("ssl/root_ca.crt",        $pgdata);
-	copy_files("ssl/root+client.crl",    $pgdata);
+	if (defined($openssl))
+	{
+		copy_files("ssl/server-*.crt", $pgdata);
+		copy_files("ssl/server-*.key", $pgdata);
+		chmod(0600, glob "$pgdata/server-*.key") or die $!;
+		copy_files("ssl/root+client_ca.crt", $pgdata);
+		copy_files("ssl/root_ca.crt",        $pgdata);
+		copy_files("ssl/root+client.crl",    $pgdata);
+	}
+	elsif (defined($nss))
+	{
+		RecursiveCopy::copypath("ssl/nss", $pgdata . "/nss") if -e "ssl/nss";
+	}
 
 	# Stop and restart server to load new listen_addresses.
 	$node->restart;
@@ -157,26 +184,51 @@ sub configure_test_server_for_ssl
 	# Change pg_hba after restart because hostssl requires ssl=on
 	configure_hba_for_ssl($node, $servercidr, $authmethod);
 
+	# Finally, perform backend specific configuration
+	$backend->init();
+
 	return;
 }
 
-# Change the configuration to use given server cert file, and reload
-# the server so that the configuration takes effect.
-sub switch_server_cert
+sub ssl_library
+{
+	return $backend->get_library();
+}
+
+sub cleanup
+{
+	$backend->cleanup();
+}
+
+# Change the configuration to use given server cert file,
+sub set_server_cert
 {
 	my $node     = $_[0];
 	my $certfile = $_[1];
 	my $cafile   = $_[2] || "root+client_ca";
+	my $keyfile  = $_[3] || '';
+	my $pwcmd    = $_[4] || '';
 	my $pgdata   = $node->data_dir;
 
+	$keyfile = $certfile if $keyfile eq '';
+
 	open my $sslconf, '>', "$pgdata/sslconfig.conf";
 	print $sslconf "ssl=on\n";
-	print $sslconf "ssl_ca_file='$cafile.crt'\n";
-	print $sslconf "ssl_cert_file='$certfile.crt'\n";
-	print $sslconf "ssl_key_file='$certfile.key'\n";
-	print $sslconf "ssl_crl_file='root+client.crl'\n";
+	print $sslconf $backend->set_server_cert($certfile, $cafile, $keyfile);
+	print $sslconf "ssl_passphrase_command='$pwcmd'\n"
+	  unless $pwcmd eq '';
 	close $sslconf;
+	return;
+}
 
+# Change the configuration to use given server cert file, and reload
+# the server so that the configuration takes effect.
+# Takes the same arguments as set_server_cert, which it calls to do that
+# piece of the work.
+sub switch_server_cert
+{
+	my $node = $_[0];
+	set_server_cert(@_);
 	$node->restart;
 	return;
 }
-- 
2.21.1 (Apple Git-122.3)

From e6d64a38c864c3355585547219b58db7c21e5c78 Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Wed, 28 Oct 2020 11:24:02 +0100
Subject: [PATCH v16 3/5] NSS pg_strong_random support

---
 configure                   |  8 +++++++-
 configure.ac                |  5 ++++-
 src/include/pg_config.h.in  |  3 +++
 src/port/pg_strong_random.c | 37 +++++++++++++++++++++++++++++++++++++
 4 files changed, 51 insertions(+), 2 deletions(-)

diff --git a/configure b/configure
index 6287a0e2fe..f78772bd42 100755
--- a/configure
+++ b/configure
@@ -18426,6 +18426,12 @@ $as_echo "#define USE_WIN32_RANDOM 1" >>confdefs.h
 
   { $as_echo "$as_me:${as_lineno-$LINENO}: result: Windows native" >&5
 $as_echo "Windows native" >&6; }
+elif test x"$USE_NSS_RANDOM" = x"1" ; then
+
+$as_echo "#define USE_NSS_RANDOM 1" >>confdefs.h
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: NSS" >&5
+$as_echo "NSS" >&6; }
 elif test x"$USE_DEV_URANDOM" = x"1" ; then
 
 $as_echo "#define USE_DEV_URANDOM 1" >>confdefs.h
@@ -18435,7 +18441,7 @@ $as_echo "/dev/urandom" >&6; }
 else
   as_fn_error $? "
 no source of strong random numbers was found
-PostgreSQL can use OpenSSL or /dev/urandom as a source of random numbers." "$LINENO" 5
+PostgreSQL can use OpenSSL, NSS, Windows native RNG or /dev/urandom as a source of random numbers." "$LINENO" 5
 fi
 
 # If not set in template file, set bytes to use libc memset()
diff --git a/configure.ac b/configure.ac
index 706c9862e7..01c23356ab 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2215,13 +2215,16 @@ if test x"$USE_OPENSSL_RANDOM" = x"1" ; then
 elif test x"$USE_WIN32_RANDOM" = x"1" ; then
   AC_DEFINE(USE_WIN32_RANDOM, 1, [Define to use native Windows API for random number generation])
   AC_MSG_RESULT([Windows native])
+elif test x"$USE_NSS_RANDOM" = x"1" ; then
+  AC_DEFINE(USE_NSS_RANDOM, 1, [Define to use NSS for random number generation])
+  AC_MSG_RESULT([NSS])
 elif test x"$USE_DEV_URANDOM" = x"1" ; then
   AC_DEFINE(USE_DEV_URANDOM, 1, [Define to use /dev/urandom for random number generation])
   AC_MSG_RESULT([/dev/urandom])
 else
   AC_MSG_ERROR([
 no source of strong random numbers was found
-PostgreSQL can use OpenSSL or /dev/urandom as a source of random numbers.])
+PostgreSQL can use OpenSSL, NSS, Windows native RNG or /dev/urandom as a source of random numbers.])
 fi
 
 # If not set in template file, set bytes to use libc memset()
diff --git a/src/include/pg_config.h.in b/src/include/pg_config.h.in
index 31f808398c..73c39b449c 100644
--- a/src/include/pg_config.h.in
+++ b/src/include/pg_config.h.in
@@ -896,6 +896,9 @@
 /* Define to build with NSS support (--with-nss) */
 #undef USE_NSS
 
+/* Define to use NSS for random number generation */
+#undef USE_NSS_RANDOM
+
 /* Define to 1 to use software CRC-32C implementation (slicing-by-8). */
 #undef USE_SLICING_BY_8_CRC32C
 
diff --git a/src/port/pg_strong_random.c b/src/port/pg_strong_random.c
index 14e8382cd8..33af92a60b 100644
--- a/src/port/pg_strong_random.c
+++ b/src/port/pg_strong_random.c
@@ -30,6 +30,20 @@
 #ifdef USE_WIN32_RANDOM
 #include <wincrypt.h>
 #endif
+#ifdef USE_NSS_RANDOM
+#define pg_BITS_PER_BYTE BITS_PER_BYTE
+#undef BITS_PER_BYTE
+#include <nss/nss.h>
+#include <nss/pk11pub.h>
+#if defined(BITS_PER_BYTE)
+#if BITS_PER_BYTE != pg_BITS_PER_BYTE
+#error "incompatible byte widths between NSPR and postgres"
+#endif
+#else
+#define BITS_PER_BYTE pg_BITS_PER_BYTE
+#endif
+#undef pg_BITS_PER_BYTE
+#endif
 
 #ifdef USE_WIN32_RANDOM
 /*
@@ -158,6 +172,29 @@ pg_strong_random(void *buf, size_t len)
 	}
 	return false;
 
+#elif defined(USE_NSS_RANDOM)
+	NSSInitParameters params;
+	NSSInitContext *nss_context;
+	SECStatus status;
+
+	memset(&params, 0, sizeof(params));
+	params.length = sizeof(params);
+	nss_context = NSS_InitContext("", "", "", "", &params,
+							  NSS_INIT_READONLY | NSS_INIT_NOCERTDB |
+							  NSS_INIT_NOMODDB | NSS_INIT_FORCEOPEN |
+							  NSS_INIT_NOROOTINIT | NSS_INIT_PK11RELOAD);
+
+	if (!nss_context)
+		return false;
+
+	status = PK11_GenerateRandom(buf, len);
+	NSS_ShutdownContext(nss_context);
+
+	if (status == SECSuccess)
+		return true;
+
+	return false;
+
 	/*
 	 * Read /dev/urandom ourselves.
 	 */
-- 
2.21.1 (Apple Git-122.3)

From 909e1181ec817618eef1bb88f507628bd471ea72 Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Wed, 28 Oct 2020 11:26:31 +0100
Subject: [PATCH v16 4/5] NSS Documentation

---
 doc/src/sgml/acronyms.sgml     | 43 +++++++++++++++++++
 doc/src/sgml/config.sgml       | 28 ++++++++++--
 doc/src/sgml/installation.sgml | 30 ++++++++++++-
 doc/src/sgml/libpq.sgml        | 27 ++++++++++--
 doc/src/sgml/runtime.sgml      | 78 ++++++++++++++++++++++++++++++++--
 5 files changed, 195 insertions(+), 11 deletions(-)

diff --git a/doc/src/sgml/acronyms.sgml b/doc/src/sgml/acronyms.sgml
index 4e5ec983c0..4f6f0cf353 100644
--- a/doc/src/sgml/acronyms.sgml
+++ b/doc/src/sgml/acronyms.sgml
@@ -441,6 +441,28 @@
     </listitem>
    </varlistentry>
 
+   <varlistentry>
+    <term><acronym>NSPR</acronym></term>
+    <listitem>
+     <para>
+      <ulink
+      url="https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSPR">
+      Netscape Portable Runtime</ulink>
+     </para>
+    </listitem>
+   </varlistentry>
+
+   <varlistentry>
+    <term><acronym>NSS</acronym></term>
+    <listitem>
+     <para>
+      <ulink
+      url="https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS">
+      Network Security Services</ulink>
+     </para>
+    </listitem>
+   </varlistentry>
+
    <varlistentry>
     <term><acronym>ODBC</acronym></term>
     <listitem>
@@ -539,6 +561,17 @@
     </listitem>
    </varlistentry>
 
+   <varlistentry>
+    <term><acronym>PKCS#12</acronym></term>
+    <listitem>
+     <para>
+      <ulink
+      url="https://en.wikipedia.org/wiki/PKCS_12">
+      Public-Key Cryptography Standards #12</ulink>
+     </para>
+    </listitem>
+   </varlistentry>
+
    <varlistentry>
     <term><acronym>PL</acronym></term>
     <listitem>
@@ -684,6 +717,16 @@
     </listitem>
    </varlistentry>
 
+   <varlistentry>
+    <term><acronym>TLS</acronym></term>
+    <listitem>
+     <para>
+      <ulink url="https://sv.wikipedia.org/wiki/Transport_Layer_Security">
+      Transport Layer Security</ulink>
+     </para>
+    </listitem>
+   </varlistentry>
+
    <varlistentry>
     <term><acronym>TOAST</acronym></term>
     <listitem>
diff --git a/doc/src/sgml/config.sgml b/doc/src/sgml/config.sgml
index f043433e31..f7ae3b1be1 100644
--- a/doc/src/sgml/config.sgml
+++ b/doc/src/sgml/config.sgml
@@ -1208,6 +1208,23 @@ include_dir 'conf.d'
       </listitem>
      </varlistentry>
 
+     <varlistentry id="guc-ssl-database" xreflabel="ssl_database">
+      <term><varname>ssl_database</varname> (<type>string</type>)
+      <indexterm>
+       <primary><varname>ssl_database</varname> configuration parameter</primary>
+      </indexterm>
+      </term>
+      <listitem>
+       <para>
+        Specifies the name of the file containing the server certificates and
+        keys when using <productname>NSS</productname> for <acronym>SSL</acronym>
+        connections. This parameter can only be set in the
+        <filename>postgresql.conf</filename> file or on the server command
+        line.
+       </para>
+      </listitem>
+     </varlistentry>
+
      <varlistentry id="guc-ssl-ciphers" xreflabel="ssl_ciphers">
       <term><varname>ssl_ciphers</varname> (<type>string</type>)
       <indexterm>
@@ -1224,7 +1241,9 @@ include_dir 'conf.d'
         connections using TLS version 1.2 and lower are affected.  There is
         currently no setting that controls the cipher choices used by TLS
         version 1.3 connections.  The default value is
-        <literal>HIGH:MEDIUM:+3DES:!aNULL</literal>.  The default is usually a
+        <literal>HIGH:MEDIUM:+3DES:!aNULL</literal> for servers which have
+        been built with <productname>OpenSSL</productname> as the
+        <acronym>SSL</acronym> library.  The default is usually a
         reasonable choice unless you have specific security requirements.
        </para>
 
@@ -1426,8 +1445,11 @@ include_dir 'conf.d'
        <para>
         Sets an external command to be invoked when a passphrase for
         decrypting an SSL file such as a private key needs to be obtained.  By
-        default, this parameter is empty, which means the built-in prompting
-        mechanism is used.
+        default, this parameter is empty. When the server is using
+        <productname>OpenSSL</productname>, this means the built-in prompting
+        mechanism is used. When using <productname>NSS</productname>, there is
+        no default prompting so a blank callback will be used returning an
+        empty password.
        </para>
        <para>
         The command must print the passphrase to the standard output and exit
diff --git a/doc/src/sgml/installation.sgml b/doc/src/sgml/installation.sgml
index 0ac1cb9999..bd09124fb0 100644
--- a/doc/src/sgml/installation.sgml
+++ b/doc/src/sgml/installation.sgml
@@ -250,7 +250,7 @@ su - postgres
 
     <listitem>
      <para>
-      You need <productname>OpenSSL</productname>, if you want to support
+      You need a supported <acronym>SSL</acronym> library, if you want to support
       encrypted client connections.  <productname>OpenSSL</productname> is
       also required for random number generation on platforms that do not
       have <filename>/dev/urandom</filename> (except Windows).  The minimum
@@ -966,6 +966,31 @@ build-postgresql:
        </listitem>
       </varlistentry>
 
+      <varlistentry>
+       <term><option>--with-nss</option>
+       <indexterm>
+        <primary>NSS</primary>
+        <secondary>NSPR</secondary>
+        <seealso>SSL</seealso>
+       </indexterm>
+       </term>
+       <listitem>
+        <para>
+         Build with support for <acronym>SSL</acronym> (encrypted)
+         connections using <productname>NSS</productname>. This requires the
+         <productname>NSS</productname> package to be installed. Additionally,
+         <productname>NSS</productname> requires <productname>NSPR</productname>
+         to be installed. <filename>configure</filename> will check for the
+         required header files and libraries to make sure that your
+         <productname>NSS</productname> installation is sufficient before
+         proceeding.
+        </para>
+        <para>
+         This option is incompatible with <literal>--with-openssl</literal>.
+        </para>
+       </listitem>
+      </varlistentry>
+
       <varlistentry>
        <term><option>--with-openssl</option>
        <indexterm>
@@ -982,6 +1007,9 @@ build-postgresql:
          your <productname>OpenSSL</productname> installation is sufficient
          before proceeding.
         </para>
+        <para>
+         This option is incompatible with <literal>--with-nss</literal>.
+        </para>
        </listitem>
       </varlistentry>
 
diff --git a/doc/src/sgml/libpq.sgml b/doc/src/sgml/libpq.sgml
index 9ce32fb39b..61d9082052 100644
--- a/doc/src/sgml/libpq.sgml
+++ b/doc/src/sgml/libpq.sgml
@@ -2459,6 +2459,8 @@ void *PQsslStruct(const PGconn *conn, const char *struct_name);
       </para>
       <para>
        The struct(s) available depend on the SSL implementation in use.
+      </para>
+      <para>
        For <productname>OpenSSL</productname>, there is one struct,
        available under the name "OpenSSL", and it returns a pointer to the
        <productname>OpenSSL</productname> <literal>SSL</literal> struct.
@@ -2482,9 +2484,14 @@ void *PQsslStruct(const PGconn *conn, const char *struct_name);
 ]]></programlisting>
       </para>
       <para>
-       This structure can be used to verify encryption levels, check server
-       certificates, and more. Refer to the <productname>OpenSSL</productname>
-       documentation for information about this structure.
+       For <productname>NSS</productname>, there is one struct available under
+       the name "NSS", and it returns a pointer to the
+       <productname>NSS</productname> <literal>PRFileDesc</literal>.
+      </para>
+      <para>
+       These structures can be used to verify encryption levels, check server
+       certificates, and more. Refer to the <acronym>SSL</acronym> library
+       documentation for information about these structures.
       </para>
      </listitem>
     </varlistentry>
@@ -2511,6 +2518,10 @@ void *PQgetssl(const PGconn *conn);
        <xref linkend="libpq-PQsslInUse"/> instead, and for more details about the
        connection, use <xref linkend="libpq-PQsslAttribute"/>.
       </para>
+      <para>
+       This function returns <literal>NULL</literal> when <acronym>SSL</acronym>
+       librariaes other than <productname>OpenSSL</productname> are used.
+      </para>
      </listitem>
     </varlistentry>
 
@@ -7943,6 +7954,11 @@ void PQinitOpenSSL(int do_ssl, int do_crypto);
        before first opening a database connection.  Also be sure that you
        have done that initialization before opening a database connection.
       </para>
+
+      <para>
+       This function does nothing when using <productname>NSS</productname> as
+       the <acronym>SSL</acronym> library.
+      </para>
      </listitem>
     </varlistentry>
 
@@ -7969,6 +7985,11 @@ void PQinitSSL(int do_ssl);
        might be preferable for applications that need to work with older
        versions of <application>libpq</application>.
       </para>
+
+      <para>
+       This function does nothing when using <productname>NSS</productname> as
+       the <acronym>SSL</acronym> library.
+      </para>
      </listitem>
     </varlistentry>
    </variablelist>
diff --git a/doc/src/sgml/runtime.sgml b/doc/src/sgml/runtime.sgml
index 17e938148c..fe7e305b75 100644
--- a/doc/src/sgml/runtime.sgml
+++ b/doc/src/sgml/runtime.sgml
@@ -2183,15 +2183,21 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
 
   <indexterm zone="ssl-tcp">
    <primary>SSL</primary>
+   <secondary>TLS</secondary>
   </indexterm>
 
   <para>
    <productname>PostgreSQL</productname> has native support for using
    <acronym>SSL</acronym> connections to encrypt client/server communications
    for increased security. This requires that
-   <productname>OpenSSL</productname> is installed on both client and
+   a supported TLS library is installed on both client and
    server systems and that support in <productname>PostgreSQL</productname> is
    enabled at build time (see <xref linkend="installation"/>).
+   Supported libraries are <productname>OpenSSL</productname> and
+   <productname>NSS</productname>. The terms <acronym>SSL</acronym> and
+   <acronym>TLS</acronym> are often used interchangeably to mean a secure
+   connection using a <acronym>TLS</acronym> protocol, even though
+   <acronym>SSL</acronym> protocols are no longer supported.
   </para>
 
   <sect2 id="ssl-setup">
@@ -2211,8 +2217,13 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
   </para>
 
   <para>
-   To start in <acronym>SSL</acronym> mode, files containing the server certificate
-   and private key must exist.  By default, these files are expected to be
+   To start in <acronym>SSL</acronym> mode, a server certificate
+   and private key must exist. The below sections on the different libraries
+   will discuss how to configure these.
+  </para>
+   
+  <para>
+   By default, these files are expected to be
    named <filename>server.crt</filename> and <filename>server.key</filename>, respectively, in
    the server's data directory, but other names and locations can be specified
    using the configuration parameters <xref linkend="guc-ssl-cert-file"/>
@@ -2302,6 +2313,18 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
   </note>
   </sect2>
 
+  <sect2 id="ssl-nss-config">
+   <title>NSS Configuration</title>
+
+  <para>
+   <productname>PostgreSQL</productname> will look for certificates and keys
+   in the <productname>NSS</productname> database specified by the parameter
+   <xref linkend="guc-ssl-database"/> in <filename>postgresql.conf</filename>.
+   The paramaters for certificate and key filenames are used to identify the
+   nicknames in the database.
+  </para>
+  </sect2>
+
   <sect2 id="ssl-client-certificates">
    <title>Using Client Certificates</title>
 
@@ -2376,7 +2399,7 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
   </sect2>
 
   <sect2 id="ssl-server-files">
-   <title>SSL Server File Usage</title>
+   <title>SSL Server File Parameter Usage</title>
 
    <para>
     <xref linkend="ssl-file-usage"/> summarizes the files that are
@@ -2423,6 +2446,14 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
       <entry>client certificate must not be on this list</entry>
      </row>
 
+     <row>
+      <entry><xref linkend="guc-ssl-database"/></entry>
+      <entry>certificate database</entry>
+      <entry>contains server certificates, keys and revocation lists; only
+      used when <productname>PostgreSQL</productname> is built with support
+      for <productname>NSS</productname>.</entry>
+     </row>
+
     </tbody>
    </tgroup>
   </table>
@@ -2550,6 +2581,45 @@ openssl x509 -req -in server.csr -text -days 365 \
    </para>
   </sect2>
 
+  <sect2 id="nss-certificate-database">
+   <title>NSS Certificate Databases</title>
+
+   <para>
+    When using <productname>NSS</productname>, all certificates and keys must
+    be loaded into an <productname>NSS</productname> certificate database.
+   </para>
+
+   <para>
+    To create a new <productname>NSS</productname> certificate database and
+    load the certificates created in <xref linkend="ssl-certificate-creation" />,
+    use the following <productname>NSS</productname> commands:
+<programlisting>
+certutil -d "sql:server.db" -N --empty-password
+certutil -d "sql:server.db" -A -n server.crt -i server.crt -t "CT,C,C"
+certutil -d "sql:server.db" -A -n root.crt -i root.crt -t "CT,C,C"
+</programlisting>
+    This will give the certificate the filename as the nickname identifier in
+    the database which is created as <filename>server.db</filename>.
+   </para>
+   <para>
+    Then load the server key, which require converting it to
+    <acronym>PKCS#12</acronym> format using the
+    <productname>OpenSSL</productname> tools:
+<programlisting>
+openssl pkcs12 -export -out server.pfx -inkey server.key -in server.crt \
+  -certfile root.crt -passout pass:
+pk12util -i server.pfx -d server.db -W ''
+</programlisting>
+   </para>
+   <para>
+    Finally a certificate revocation list can be loaded with the following
+    commands:
+<programlisting>
+crlutil -I -i server.crl -d server.db -B
+</programlisting>
+   </para>
+  </sect2>
+
  </sect1>
 
  <sect1 id="gssapi-enc">
-- 
2.21.1 (Apple Git-122.3)

From a329224d8626931422c78833c508f9cb6dce5797 Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Wed, 28 Oct 2020 11:34:37 +0100
Subject: [PATCH v16 5/5] NSS contrib modules

---
 contrib/Makefile            |   2 +-
 contrib/pgcrypto/Makefile   |   7 +-
 contrib/pgcrypto/nss.c      | 773 ++++++++++++++++++++++++++++++++++++
 contrib/sslinfo/sslinfo.c   | 164 ++++----
 doc/src/sgml/pgcrypto.sgml  |  38 +-
 doc/src/sgml/sslinfo.sgml   |  12 +-
 src/tools/msvc/Install.pm   |   3 +-
 src/tools/msvc/Mkvcbuild.pm |  12 +-
 8 files changed, 908 insertions(+), 103 deletions(-)
 create mode 100644 contrib/pgcrypto/nss.c

diff --git a/contrib/Makefile b/contrib/Makefile
index 7a4866e338..c2232e5a4d 100644
--- a/contrib/Makefile
+++ b/contrib/Makefile
@@ -52,7 +52,7 @@ SUBDIRS = \
 		unaccent	\
 		vacuumlo
 
-ifeq ($(with_openssl),yes)
+ifneq ($(with_ssl),no)
 SUBDIRS += sslinfo
 else
 ALWAYS_SUBDIRS += sslinfo
diff --git a/contrib/pgcrypto/Makefile b/contrib/pgcrypto/Makefile
index 61eabd2fc0..28b54d321b 100644
--- a/contrib/pgcrypto/Makefile
+++ b/contrib/pgcrypto/Makefile
@@ -7,11 +7,14 @@ INT_TESTS = sha2
 OSSL_SRCS = openssl.c pgp-mpi-openssl.c
 OSSL_TESTS = sha2 des 3des cast5
 
+NSS_SRCS = nss.c pgp-mpi-internal.c imath.c blf.c
+NSS_TESTS = sha2 des 3des
+
 ZLIB_TST = pgp-compression
 ZLIB_OFF_TST = pgp-zlib-DISABLED
 
-CF_SRCS = $(if $(subst no,,$(with_openssl)), $(OSSL_SRCS), $(INT_SRCS))
-CF_TESTS = $(if $(subst no,,$(with_openssl)), $(OSSL_TESTS), $(INT_TESTS))
+CF_SRCS = $(if $(findstring openssl, $(with_ssl)), $(OSSL_SRCS), $(if $(findstring nss, $(with_ssl)), $(NSS_SRCS), $(INT_SRCS)))
+CF_TESTS = $(if $(findstring openssl, $(with_ssl)), $(OSSL_TESTS), $(if $(findstring nss, $(with_ssl)), $(NSS_TESTS), $(INT_TESTS)))
 CF_PGP_TESTS = $(if $(subst no,,$(with_zlib)), $(ZLIB_TST), $(ZLIB_OFF_TST))
 
 SRCS = \
diff --git a/contrib/pgcrypto/nss.c b/contrib/pgcrypto/nss.c
new file mode 100644
index 0000000000..e1291ed403
--- /dev/null
+++ b/contrib/pgcrypto/nss.c
@@ -0,0 +1,773 @@
+/*-------------------------------------------------------------------------
+ *
+ * nss.c
+ *	  Wrapper for using NSS as a backend for pgcrypto PX
+ *
+ *
+ * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ *	  contrib/pgcrypto/nss.c
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#include "postgres.h"
+
+#include "px.h"
+#include "blf.h"
+#include "utils/memutils.h"
+
+/*
+ * BITS_PER_BYTE is also defined in the NSPR header files, so we need to undef
+ * our version to avoid compiler warnings on redefinition.
+ */
+#define pg_BITS_PER_BYTE BITS_PER_BYTE
+#undef BITS_PER_BYTE
+
+#include <nss/nss.h>
+#include <nss/hasht.h>
+#include <nss/pk11func.h>
+#include <nss/pk11pub.h>
+#include <nss/secitem.h>
+#include <nss/sechash.h>
+#include <nss/secoid.h>
+#include <nss/secerr.h>
+
+/*
+ * Ensure that the colliding definitions match, else throw an error. In case
+ * NSPR has removed the definition for some reason, make sure to put ours
+ * back again.
+ */
+#if defined(BITS_PER_BYTE)
+#if BITS_PER_BYTE != pg_BITS_PER_BYTE
+#error "incompatible byte widths between NSPR and postgres"
+#endif
+#else
+#define BITS_PER_BYTE pg_BITS_PER_BYTE
+#endif
+#undef pg_BITS_PER_BYTE
+
+/*
+ * Define our own mechanisms for Blowfish as it's not implemented by NSS.
+ */
+#define BLOWFISH_CBC	(1)
+#define BLOWFISH_ECB	(2)
+
+/*
+ * Data structures for recording cipher implementations as well as ongoing
+ * cipher operations.
+ */
+typedef struct nss_digest
+{
+	NSSInitContext *context;
+	PK11Context *hash_context;
+	HASH_HashType hash_type;
+}			nss_digest;
+
+typedef struct cipher_implementation
+{
+	/* Function pointers to cipher operations */
+	int			(*init) (PX_Cipher *pxc, const uint8 *key, unsigned klen, const uint8 *iv);
+	unsigned	(*get_block_size) (PX_Cipher *pxc);
+	unsigned 	(*get_key_size) (PX_Cipher *pxc);
+	unsigned 	(*get_iv_size) (PX_Cipher *pxc);
+	int			(*encrypt) (PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res);
+	int			(*decrypt) (PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res);
+	void		(*free) (PX_Cipher *pxc);
+
+	/* The mechanism describing the cipher used */
+	union
+	{
+		CK_MECHANISM_TYPE nss;
+		CK_ULONG internal;
+	}			mechanism;
+	int			keylen;
+	bool		is_nss;
+}			cipher_implementation;
+
+typedef struct nss_cipher
+{
+	const cipher_implementation *impl;
+	NSSInitContext *context;
+	PK11Context *crypt_context;
+	SECItem *params;
+
+	PK11SymKey *encrypt_key;
+	PK11SymKey *decrypt_key;
+}			nss_cipher;
+
+typedef struct internal_cipher
+{
+	const cipher_implementation *impl;
+	BlowfishContext	context;
+}			internal_cipher;
+
+typedef struct nss_cipher_ref
+{
+	const char *name;
+	const cipher_implementation *impl;
+} nss_cipher_ref;
+
+/*
+ * Prototypes
+ */
+static unsigned nss_get_iv_size(PX_Cipher *pxc);
+static unsigned nss_get_block_size(PX_Cipher *pxc);
+
+/*
+ * nss_GetHashOidTagByHashType
+ *
+ * Returns the corresponding SECOidTag for the passed hash type. NSS 3.43
+ * includes HASH_GetHashOidTagByHashType for this purpose, but at the time of
+ * writing is not commonly available so we need our own version till then.
+ */
+static SECOidTag
+nss_GetHashOidTagByHashType(HASH_HashType type)
+{
+	if (type == HASH_AlgMD2)
+		return SEC_OID_MD2;
+	if (type == HASH_AlgMD5)
+		return SEC_OID_MD5;
+	if (type == HASH_AlgSHA1)
+		return SEC_OID_SHA1;
+	if (type == HASH_AlgSHA224)
+		return SEC_OID_SHA224;
+	if (type == HASH_AlgSHA256)
+		return SEC_OID_SHA256;
+	if (type == HASH_AlgSHA384)
+		return SEC_OID_SHA384;
+	if (type == HASH_AlgSHA512)
+		return SEC_OID_SHA512;
+
+	return SEC_OID_UNKNOWN;
+}
+
+static unsigned
+nss_digest_block_size(PX_MD *pxmd)
+{
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+	const SECHashObject *object;
+
+	object = HASH_GetHashObject(digest->hash_type);
+	return object->blocklength;
+}
+
+static unsigned
+nss_digest_result_size(PX_MD *pxmd)
+{
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+	const SECHashObject *object;
+
+	object = HASH_GetHashObject(digest->hash_type);
+	return object->length;
+}
+
+static void
+nss_digest_free(PX_MD *pxmd)
+{
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+	PRBool	free_ctx = PR_TRUE;
+
+	PK11_DestroyContext(digest->hash_context, free_ctx);
+	NSS_ShutdownContext(digest->context);
+}
+
+static void
+nss_digest_update(PX_MD *pxmd, const uint8 *data, unsigned dlen)
+{
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+
+	PK11_DigestOp(digest->hash_context, data, dlen);
+}
+
+static void
+nss_digest_reset(PX_MD *pxmd)
+{
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+
+	PK11_DigestBegin(digest->hash_context);
+}
+
+static void
+nss_digest_finish(PX_MD *pxmd, uint8 *dst)
+{
+	unsigned int outlen;
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+	const SECHashObject *object;
+
+	object = HASH_GetHashObject(digest->hash_type);
+	PK11_DigestFinal(digest->hash_context, dst, &outlen, object->length);
+}
+
+int
+px_find_digest(const char *name, PX_MD **res)
+{
+	PX_MD	*pxmd;
+	NSSInitParameters params;
+	NSSInitContext *nss_context;
+	bool found = false;
+	nss_digest *digest;
+	SECStatus status;
+	SECOidData *hash;
+	HASH_HashType t;
+
+	/*
+	 * Initialize our own NSS context without a database backing it.
+	 */
+	memset(&params, 0, sizeof(params));
+	params.length = sizeof(params);
+	nss_context = NSS_InitContext("", "", "", "", &params,
+								  NSS_INIT_READONLY | NSS_INIT_NOCERTDB |
+								  NSS_INIT_NOMODDB | NSS_INIT_FORCEOPEN |
+								  NSS_INIT_NOROOTINIT | NSS_INIT_PK11RELOAD);
+
+	/*
+	 * There is no API function for looking up a digest algorithm from a name
+	 * string, but there is a publically accessible array which can be scanned
+	 * for the name.
+	 */
+	for (t = HASH_AlgNULL + 1; t < HASH_AlgTOTAL; t++)
+	{
+		SECOidTag 	hash_oid;
+		char *p;
+
+		hash_oid = nss_GetHashOidTagByHashType(t);
+
+		if (hash_oid == SEC_OID_UNKNOWN)
+			return PXE_NO_HASH;
+
+		hash = SECOID_FindOIDByTag(hash_oid);
+		if (pg_strcasecmp(hash->desc, name) == 0)
+		{
+			found = true;
+			break;
+		}
+
+		/*
+		 * NSS saves the algorithm names using SHA-xxx notation whereas
+		 * OpenSSL use SHAxxx. To make sure the user finds the requested
+		 * algorithm let's remove the dash and compare that spelling as well.
+		 */
+		if ((p = strchr(hash->desc, '-')) != NULL)
+		{
+			char tmp[12];
+
+			memcpy(tmp, hash->desc, p - hash->desc);
+			memcpy(tmp + (p - hash->desc), p + 1, strlen(hash->desc) - (p - hash->desc) + 1);
+			if (pg_strcasecmp(tmp, name) == 0)
+			{
+				found = true;
+				break;
+			}
+		}
+	}
+
+	if (!found)
+		return PXE_NO_HASH;
+
+	digest = palloc(sizeof(*digest));
+
+	digest->context = nss_context;
+	digest->hash_context = PK11_CreateDigestContext(hash->offset);
+	digest->hash_type = t;
+	if (digest->hash_context == NULL)
+	{
+		pfree(digest);
+		return -1;
+	}
+
+	status = PK11_DigestBegin(digest->hash_context);
+	if (status != SECSuccess)
+	{
+		PK11_DestroyContext(digest->hash_context, PR_TRUE);
+		pfree(digest);
+		return -1;
+	}
+
+	pxmd = palloc(sizeof(*pxmd));
+	pxmd->result_size = nss_digest_result_size;
+	pxmd->block_size = nss_digest_block_size;
+	pxmd->reset = nss_digest_reset;
+	pxmd->update = nss_digest_update;
+	pxmd->finish = nss_digest_finish;
+	pxmd->free = nss_digest_free;
+	pxmd->p.ptr = (void *) digest;
+
+	*res = pxmd;
+
+	return 0;
+}
+
+static int
+bf_init(PX_Cipher *pxc, const uint8 *key, unsigned klen, const uint8 *iv)
+{
+	internal_cipher *cipher = (internal_cipher *) pxc->ptr;
+
+	blowfish_setkey(&cipher->context, key, klen);
+	if (iv)
+		blowfish_setiv(&cipher->context, iv);
+
+	return 0;
+}
+
+static int
+bf_encrypt(PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res)
+{
+	internal_cipher *cipher = (internal_cipher *) pxc->ptr;
+	uint8 *buf;
+
+	if (dlen == 0)
+		return 0;
+
+	if (dlen & 7)
+		return PXE_NOTBLOCKSIZE;
+
+	buf = palloc(dlen);
+	memcpy(buf, data, dlen);
+
+	if (cipher->impl->mechanism.internal == BLOWFISH_ECB)
+		blowfish_encrypt_ecb(buf, dlen, &cipher->context);
+	else
+		blowfish_encrypt_cbc(buf, dlen, &cipher->context);
+
+	memcpy(res, buf, dlen);
+	pfree(buf);
+
+	return 0;
+}
+
+static int
+bf_decrypt(PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res)
+{
+	internal_cipher *cipher = (internal_cipher *) pxc->ptr;
+
+	if (dlen == 0)
+		return 0;
+
+	if (dlen & 7)
+		return PXE_NOTBLOCKSIZE;
+
+	memcpy(res, data, dlen);
+	if (cipher->impl->mechanism.internal == BLOWFISH_ECB)
+		blowfish_decrypt_ecb(res, dlen, &cipher->context);
+	else
+		blowfish_decrypt_cbc(res, dlen, &cipher->context);
+
+	return 0;
+}
+
+static void
+bf_free(PX_Cipher *pxc)
+{
+	internal_cipher *cipher = (internal_cipher *) pxc->ptr;
+
+	pfree(cipher);
+	pfree(pxc);
+}
+
+static int
+nss_symkey_blockcipher_init(PX_Cipher *pxc, const uint8 *key, unsigned klen,
+							const uint8 *iv)
+{
+	nss_cipher	   *cipher = (nss_cipher *) pxc->ptr;
+	SECItem			iv_item;
+	unsigned char  *iv_item_data;
+	SECItem			key_item;
+	int				keylen;
+	PK11SlotInfo   *slot;
+
+	if (cipher->impl->mechanism.nss == CKM_AES_CBC ||
+		cipher->impl->mechanism.nss == CKM_AES_ECB)
+	{
+		if (klen <= 128 / 8)
+			keylen = 128 / 8;
+		else if (klen <= 192 / 8)
+			keylen = 192 / 8;
+		else if (klen <= 256 / 8)
+			keylen = 256 / 8;
+		else
+			return PXE_CIPHER_INIT;
+	}
+	else
+		keylen = cipher->impl->keylen;
+
+	key_item.type = siBuffer;
+	key_item.data = (unsigned char *) key;
+	key_item.len = keylen;
+
+	/*
+	 * If hardware acceleration is configured in NSS one can theoretically get
+	 * a better slot by calling PK11_GetBestSlot() with the mechanism passed
+	 * to it. Unless there are complaints, using the simpler API will make
+	 * error handling easier though.
+	 */
+	slot = PK11_GetInternalSlot();
+	if (!slot)
+		return PXE_CIPHER_INIT;
+
+	/*
+	 * The key must be set up for the operation, and since we don't know at
+	 * this point whether we are asked to encrypt or decrypt we need to store
+	 * both versions.
+	 */
+	cipher->decrypt_key = PK11_ImportSymKey(slot, cipher->impl->mechanism.nss,
+											PK11_OriginUnwrap,
+											CKA_DECRYPT, &key_item,
+											NULL);
+	cipher->encrypt_key = PK11_ImportSymKey(slot, cipher->impl->mechanism.nss,
+											PK11_OriginUnwrap,
+											CKA_ENCRYPT, &key_item,
+											NULL);
+	PK11_FreeSlot(slot);
+
+	if (!cipher->decrypt_key || !cipher->encrypt_key)
+		return PXE_CIPHER_INIT;
+
+	if (iv)
+	{
+		iv_item.type = siBuffer;
+		iv_item.data = (unsigned char *) iv;
+		iv_item.len = nss_get_iv_size(pxc);
+	}
+	else
+	{
+		/*
+		 * The documentation states that either passing .data = 0; .len = 0;
+		 * in the iv_item, or NULL as iv_item, to PK11_ParamFromIV should be
+		 * done when IV is missing. That however leads to segfaults in the
+		 * library, the workaround that works in modern  library versions is
+		 * to pass in a keysized zeroed out IV.
+		 */
+		iv_item_data = palloc0(nss_get_iv_size(pxc));
+		iv_item.type = siBuffer;
+		iv_item.data = iv_item_data;
+		iv_item.len = nss_get_iv_size(pxc);
+	}
+
+	cipher->params = PK11_ParamFromIV(cipher->impl->mechanism.nss, &iv_item);
+
+	/* If we had to make a mock IV, free it once made into a param */
+	if (!iv)
+		pfree(iv_item_data);
+
+	if (cipher->params == NULL)
+		return PXE_CIPHER_INIT;
+
+	return 0;
+}
+
+static int
+nss_decrypt(PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res)
+{
+	nss_cipher *cipher = (nss_cipher *) pxc->ptr;
+	SECStatus	status;
+	int outlen;
+
+	if (!cipher->crypt_context)
+	{
+		cipher->crypt_context =
+			PK11_CreateContextBySymKey(cipher->impl->mechanism.nss, CKA_DECRYPT,
+									   cipher->decrypt_key, cipher->params);
+	}
+
+	status = PK11_CipherOp(cipher->crypt_context, res, &outlen, dlen, data, dlen);
+	if (status != SECSuccess)
+		return PXE_DECRYPT_FAILED;
+
+	return 0;
+}
+
+static int
+nss_encrypt(PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res)
+{
+	nss_cipher *cipher = (nss_cipher *) pxc->ptr;
+	SECStatus	status;
+	int outlen;
+
+	if (!cipher->crypt_context)
+	{
+		cipher->crypt_context =
+			PK11_CreateContextBySymKey(cipher->impl->mechanism.nss, CKA_ENCRYPT,
+									   cipher->decrypt_key, cipher->params);
+	}
+
+	status = PK11_CipherOp(cipher->crypt_context, res, &outlen, dlen, data, dlen);
+
+	if (status != SECSuccess)
+		return PXE_DECRYPT_FAILED;
+
+	return 0;
+}
+
+static void
+nss_free(PX_Cipher *pxc)
+{
+	nss_cipher *cipher = pxc->ptr;
+	PRBool		free_ctx = PR_TRUE;
+
+	PK11_FreeSymKey(cipher->encrypt_key);
+	PK11_FreeSymKey(cipher->decrypt_key);
+	PK11_DestroyContext(cipher->crypt_context, free_ctx);
+	NSS_ShutdownContext(cipher->context);
+	pfree(cipher);
+
+	pfree(pxc);
+}
+
+static unsigned
+nss_get_block_size(PX_Cipher *pxc)
+{
+	nss_cipher *cipher = pxc->ptr;
+
+	return PK11_GetBlockSize(cipher->impl->mechanism.nss, NULL);
+}
+
+static unsigned
+nss_get_key_size(PX_Cipher *pxc)
+{
+	nss_cipher *cipher = pxc->ptr;
+
+	return cipher->impl->keylen;
+}
+
+static unsigned
+nss_get_iv_size(PX_Cipher *pxc)
+{
+	nss_cipher *cipher = pxc->ptr;
+
+	return PK11_GetIVLength(cipher->impl->mechanism.nss);
+}
+
+static unsigned
+bf_get_block_size(PX_Cipher *pxc)
+{
+	return 8;
+}
+
+static unsigned
+bf_get_key_size(PX_Cipher *pxc)
+{
+	return 448 / 8;
+}
+
+static unsigned
+bf_get_iv_size(PX_Cipher *pxc)
+{
+	return 8;
+}
+
+/*
+ * Cipher Implementations
+ */
+static const cipher_implementation nss_des_cbc = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_DES_CBC,
+	.keylen = 8,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_des_ecb = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_DES_ECB,
+	.keylen = 8,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_des3_cbc = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_DES3_CBC,
+	.keylen = 24,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_des3_ecb = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_DES3_ECB,
+	.keylen = 24,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_aes_cbc = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_AES_CBC,
+	.keylen = 32,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_aes_ecb = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_AES_ECB,
+	.keylen = 32,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_bf_ecb = {
+	.init = bf_init,
+	.get_block_size = bf_get_block_size,
+	.get_key_size = bf_get_key_size,
+	.get_iv_size = bf_get_iv_size,
+	.encrypt = bf_encrypt,
+	.decrypt = bf_decrypt,
+	.free = bf_free,
+	.mechanism.internal = BLOWFISH_ECB,
+	.keylen = 56,
+	.is_nss = false
+};
+
+static const cipher_implementation nss_bf_cbc = {
+	.init = bf_init,
+	.get_block_size = bf_get_block_size,
+	.get_key_size = bf_get_key_size,
+	.get_iv_size = bf_get_iv_size,
+	.encrypt = bf_encrypt,
+	.decrypt = bf_decrypt,
+	.free = bf_free,
+	.mechanism.internal = BLOWFISH_CBC,
+	.keylen = 56,
+	.is_nss = false
+};
+
+/*
+ * Lookup table for finding the implementation based on a name. CAST5 as well
+ * as BLOWFISH are defined as cipher mechanisms in NSS but error out with
+ * SEC_ERROR_INVALID_ALGORITHM. Blowfish is implemented using the internal
+ * implementation while CAST5 isn't supported at all at this time,
+ */
+static const nss_cipher_ref nss_cipher_lookup[] = {
+	{"des", &nss_des_cbc},
+	{"des-cbc", &nss_des_cbc},
+	{"des-ecb", &nss_des_ecb},
+	{"des3-cbc", &nss_des3_cbc},
+	{"3des", &nss_des3_cbc},
+	{"3des-cbc", &nss_des3_cbc},
+	{"des3-ecb", &nss_des3_ecb},
+	{"3des-ecb", &nss_des3_ecb},
+	{"aes", &nss_aes_cbc},
+	{"aes-cbc", &nss_aes_cbc},
+	{"aes-ecb", &nss_aes_ecb},
+	{"rijndael", &nss_aes_cbc},
+	{"rijndael-cbc", &nss_aes_cbc},
+	{"rijndael-ecb", &nss_aes_ecb},
+	{"blowfish", &nss_bf_cbc},
+	{"blowfish-cbc", &nss_bf_cbc},
+	{"blowfish-ecb", &nss_bf_ecb},
+	{"bf", &nss_bf_cbc},
+	{"bf-cbc", &nss_bf_cbc},
+	{"bf-ecb", &nss_bf_ecb},
+	{NULL}
+};
+
+/*
+ * px_find_cipher
+ *
+ * Search for the requested cipher and see if there is support for it, and if
+ * so return an allocated object containing the playbook for how to encrypt
+ * and decrypt using the cipher.
+ */
+int
+px_find_cipher(const char *alias, PX_Cipher **res)
+{
+	const nss_cipher_ref *cipher_ref;
+	PX_Cipher  *px_cipher;
+	NSSInitParameters params;
+	NSSInitContext *nss_context;
+	nss_cipher	*cipher;
+	internal_cipher *int_cipher;
+
+	for (cipher_ref = nss_cipher_lookup; cipher_ref->name; cipher_ref++)
+	{
+		if (strcmp(cipher_ref->name, alias) == 0)
+			break;
+	}
+
+	if (!cipher_ref->name)
+		return PXE_NO_CIPHER;
+
+	/*
+	 * Fill in the PX_Cipher to pass back to PX describing the operations to
+	 * perform in order to use the cipher.
+	 */
+	px_cipher = palloc(sizeof(*px_cipher));
+	px_cipher->block_size = cipher_ref->impl->get_block_size;
+	px_cipher->key_size = cipher_ref->impl->get_key_size;
+	px_cipher->iv_size = cipher_ref->impl->get_iv_size;
+	px_cipher->free = cipher_ref->impl->free;
+	px_cipher->init = cipher_ref->impl->init;
+	px_cipher->encrypt = cipher_ref->impl->encrypt;
+	px_cipher->decrypt = cipher_ref->impl->decrypt;
+
+	/*
+	 * Set the private data, which is different for NSS and internal ciphers
+	 */
+	if (cipher_ref->impl->is_nss)
+	{
+		/*
+		 * Initialize our own NSS context without a database backing it. At
+		 * some point we might want to allow users to use stored keys in the
+		 * database rather than passing them via SELECT encrypt(), and then
+		 * this need to be changed to open a user specified database.
+		 */
+		memset(&params, 0, sizeof(params));
+		params.length = sizeof(params);
+		nss_context = NSS_InitContext("", "", "", "", &params,
+									  NSS_INIT_READONLY | NSS_INIT_NOCERTDB |
+									  NSS_INIT_NOMODDB | NSS_INIT_FORCEOPEN |
+									  NSS_INIT_NOROOTINIT | NSS_INIT_PK11RELOAD);
+
+		/* nss_cipher is the private state struct for the operation */
+		cipher = palloc(sizeof(*cipher));
+		cipher->context = nss_context;
+		cipher->impl = cipher_ref->impl;
+		cipher->crypt_context = NULL;
+
+		px_cipher->ptr = cipher;
+	}
+	else
+	{
+		int_cipher = palloc0(sizeof(*int_cipher));
+
+		int_cipher->impl = cipher_ref->impl;
+		px_cipher->ptr = int_cipher;
+	}
+
+	*res = px_cipher;
+	return 0;
+}
diff --git a/contrib/sslinfo/sslinfo.c b/contrib/sslinfo/sslinfo.c
index 5ba3988e27..84bb2c65b8 100644
--- a/contrib/sslinfo/sslinfo.c
+++ b/contrib/sslinfo/sslinfo.c
@@ -9,9 +9,11 @@
 
 #include "postgres.h"
 
+#ifdef USE_OPENSSL
 #include <openssl/x509.h>
 #include <openssl/x509v3.h>
 #include <openssl/asn1.h>
+#endif
 
 #include "access/htup_details.h"
 #include "funcapi.h"
@@ -21,8 +23,8 @@
 
 PG_MODULE_MAGIC;
 
+#ifdef USE_OPENSSL
 static Datum X509_NAME_field_to_text(X509_NAME *name, text *fieldName);
-static Datum X509_NAME_to_text(X509_NAME *name);
 static Datum ASN1_STRING_to_text(ASN1_STRING *str);
 
 /*
@@ -32,6 +34,7 @@ typedef struct
 {
 	TupleDesc	tupdesc;
 } SSLExtensionInfoContext;
+#endif
 
 /*
  * Indicates whether current session uses SSL
@@ -54,9 +57,16 @@ PG_FUNCTION_INFO_V1(ssl_version);
 Datum
 ssl_version(PG_FUNCTION_ARGS)
 {
-	if (MyProcPort->ssl == NULL)
+	const char *version;
+
+	if (!MyProcPort->ssl_in_use)
+		PG_RETURN_NULL();
+
+	version = be_tls_get_version(MyProcPort);
+	if (version == NULL)
 		PG_RETURN_NULL();
-	PG_RETURN_TEXT_P(cstring_to_text(SSL_get_version(MyProcPort->ssl)));
+
+	PG_RETURN_TEXT_P(cstring_to_text(version));
 }
 
 
@@ -67,9 +77,16 @@ PG_FUNCTION_INFO_V1(ssl_cipher);
 Datum
 ssl_cipher(PG_FUNCTION_ARGS)
 {
-	if (MyProcPort->ssl == NULL)
+	const char *cipher;
+
+	if (!MyProcPort->ssl_in_use)
 		PG_RETURN_NULL();
-	PG_RETURN_TEXT_P(cstring_to_text(SSL_get_cipher(MyProcPort->ssl)));
+
+	cipher = be_tls_get_cipher(MyProcPort);
+	if (cipher == NULL)
+		PG_RETURN_NULL();
+
+	PG_RETURN_TEXT_P(cstring_to_text(cipher));
 }
 
 
@@ -83,7 +100,7 @@ PG_FUNCTION_INFO_V1(ssl_client_cert_present);
 Datum
 ssl_client_cert_present(PG_FUNCTION_ARGS)
 {
-	PG_RETURN_BOOL(MyProcPort->peer != NULL);
+	PG_RETURN_BOOL(MyProcPort->peer_cert_valid);
 }
 
 
@@ -99,29 +116,26 @@ PG_FUNCTION_INFO_V1(ssl_client_serial);
 Datum
 ssl_client_serial(PG_FUNCTION_ARGS)
 {
+	char decimal[NAMEDATALEN];
 	Datum		result;
-	Port	   *port = MyProcPort;
-	X509	   *peer = port->peer;
-	ASN1_INTEGER *serial = NULL;
-	BIGNUM	   *b;
-	char	   *decimal;
 
-	if (!peer)
+	if (!MyProcPort->ssl_in_use || !MyProcPort->peer_cert_valid)
+		PG_RETURN_NULL();
+
+	be_tls_get_peer_serial(MyProcPort, decimal, NAMEDATALEN);
+
+	if (!*decimal)
 		PG_RETURN_NULL();
-	serial = X509_get_serialNumber(peer);
-	b = ASN1_INTEGER_to_BN(serial, NULL);
-	decimal = BN_bn2dec(b);
 
-	BN_free(b);
 	result = DirectFunctionCall3(numeric_in,
 								 CStringGetDatum(decimal),
 								 ObjectIdGetDatum(0),
 								 Int32GetDatum(-1));
-	OPENSSL_free(decimal);
 	return result;
 }
 
 
+#ifdef USE_OPENSSL
 /*
  * Converts OpenSSL ASN1_STRING structure into text
  *
@@ -228,7 +242,7 @@ ssl_client_dn_field(PG_FUNCTION_ARGS)
 	text	   *fieldname = PG_GETARG_TEXT_PP(0);
 	Datum		result;
 
-	if (!(MyProcPort->peer))
+	if (!MyProcPort->ssl_in_use || !MyProcPort->peer_cert_valid)
 		PG_RETURN_NULL();
 
 	result = X509_NAME_field_to_text(X509_get_subject_name(MyProcPort->peer), fieldname);
@@ -273,76 +287,23 @@ ssl_issuer_field(PG_FUNCTION_ARGS)
 	else
 		return result;
 }
+#endif							/* USE_OPENSSL */
 
-
-/*
- * Equivalent of X509_NAME_oneline that respects encoding
- *
- * This function converts X509_NAME structure to the text variable
- * converting all textual data into current database encoding.
- *
- * Parameter: X509_NAME *name X509_NAME structure to be converted
- *
- * Returns: text datum which contains string representation of
- * X509_NAME
- */
-static Datum
-X509_NAME_to_text(X509_NAME *name)
+#ifdef USE_NSS
+PG_FUNCTION_INFO_V1(ssl_client_dn_field);
+Datum
+ssl_client_dn_field(PG_FUNCTION_ARGS)
 {
-	BIO		   *membuf = BIO_new(BIO_s_mem());
-	int			i,
-				nid,
-				count = X509_NAME_entry_count(name);
-	X509_NAME_ENTRY *e;
-	ASN1_STRING *v;
-	const char *field_name;
-	size_t		size;
-	char		nullterm;
-	char	   *sp;
-	char	   *dp;
-	text	   *result;
-
-	if (membuf == NULL)
-		ereport(ERROR,
-				(errcode(ERRCODE_OUT_OF_MEMORY),
-				 errmsg("could not create OpenSSL BIO structure")));
-
-	(void) BIO_set_close(membuf, BIO_CLOSE);
-	for (i = 0; i < count; i++)
-	{
-		e = X509_NAME_get_entry(name, i);
-		nid = OBJ_obj2nid(X509_NAME_ENTRY_get_object(e));
-		if (nid == NID_undef)
-			ereport(ERROR,
-					(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
-					 errmsg("could not get NID for ASN1_OBJECT object")));
-		v = X509_NAME_ENTRY_get_data(e);
-		field_name = OBJ_nid2sn(nid);
-		if (field_name == NULL)
-			field_name = OBJ_nid2ln(nid);
-		if (field_name == NULL)
-			ereport(ERROR,
-					(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
-					 errmsg("could not convert NID %d to an ASN1_OBJECT structure", nid)));
-		BIO_printf(membuf, "/%s=", field_name);
-		ASN1_STRING_print_ex(membuf, v,
-							 ((ASN1_STRFLGS_RFC2253 & ~ASN1_STRFLGS_ESC_MSB)
-							  | ASN1_STRFLGS_UTF8_CONVERT));
-	}
-
-	/* ensure null termination of the BIO's content */
-	nullterm = '\0';
-	BIO_write(membuf, &nullterm, 1);
-	size = BIO_get_mem_data(membuf, &sp);
-	dp = pg_any_to_server(sp, size - 1, PG_UTF8);
-	result = cstring_to_text(dp);
-	if (dp != sp)
-		pfree(dp);
-	if (BIO_free(membuf) != 1)
-		elog(ERROR, "could not free OpenSSL BIO structure");
+	PG_RETURN_NULL();
+}
 
-	PG_RETURN_TEXT_P(result);
+PG_FUNCTION_INFO_V1(ssl_issuer_field);
+Datum
+ssl_issuer_field(PG_FUNCTION_ARGS)
+{
+	PG_RETURN_NULL();
 }
+#endif							/* USE_NSS */
 
 
 /*
@@ -358,9 +319,17 @@ PG_FUNCTION_INFO_V1(ssl_client_dn);
 Datum
 ssl_client_dn(PG_FUNCTION_ARGS)
 {
-	if (!(MyProcPort->peer))
+	char		subject[NAMEDATALEN];
+
+	if (!MyProcPort->ssl_in_use || !MyProcPort->peer_cert_valid)
+		PG_RETURN_NULL();
+
+	be_tls_get_peer_subject_name(MyProcPort, subject, NAMEDATALEN);
+
+	if (!*subject)
 		PG_RETURN_NULL();
-	return X509_NAME_to_text(X509_get_subject_name(MyProcPort->peer));
+
+	PG_RETURN_TEXT_P(cstring_to_text(subject));
 }
 
 
@@ -377,12 +346,21 @@ PG_FUNCTION_INFO_V1(ssl_issuer_dn);
 Datum
 ssl_issuer_dn(PG_FUNCTION_ARGS)
 {
-	if (!(MyProcPort->peer))
+	char		issuer[NAMEDATALEN];
+
+	if (!MyProcPort->ssl_in_use || !MyProcPort->peer_cert_valid)
+		PG_RETURN_NULL();
+
+	be_tls_get_peer_issuer_name(MyProcPort, issuer, NAMEDATALEN);
+
+	if (!*issuer)
 		PG_RETURN_NULL();
-	return X509_NAME_to_text(X509_get_issuer_name(MyProcPort->peer));
+
+	PG_RETURN_TEXT_P(cstring_to_text(issuer));
 }
 
 
+#ifdef USE_OPENSSL
 /*
  * Returns information about available SSL extensions.
  *
@@ -516,3 +494,13 @@ ssl_extension_info(PG_FUNCTION_ARGS)
 	/* All done */
 	SRF_RETURN_DONE(funcctx);
 }
+#endif							/* USE_OPENSSL */
+
+#ifdef USE_NSS
+PG_FUNCTION_INFO_V1(ssl_extension_info);
+Datum
+ssl_extension_info(PG_FUNCTION_ARGS)
+{
+	PG_RETURN_NULL();
+}
+#endif							/* USE_NSS */
diff --git a/doc/src/sgml/pgcrypto.sgml b/doc/src/sgml/pgcrypto.sgml
index 8748c64e2d..f03e1f5fcf 100644
--- a/doc/src/sgml/pgcrypto.sgml
+++ b/doc/src/sgml/pgcrypto.sgml
@@ -45,8 +45,9 @@ digest(data bytea, type text) returns bytea
     <literal>sha224</literal>, <literal>sha256</literal>,
     <literal>sha384</literal> and <literal>sha512</literal>.
     If <filename>pgcrypto</filename> was built with
-    <productname>OpenSSL</productname>, more algorithms are available, as
-    detailed in <xref linkend="pgcrypto-with-without-openssl"/>.
+    <productname>OpenSSL</productname> or <productname>NSS</productname>,
+    more algorithms are available, as
+    detailed in <xref linkend="pgcrypto-with-without-openssl-nss"/>.
    </para>
 
    <para>
@@ -763,7 +764,7 @@ pgp_sym_encrypt(data, psw, 'compress-algo=1, cipher-algo=aes256')
     Which cipher algorithm to use.
    </para>
 <literallayout>
-Values: bf, aes128, aes192, aes256 (OpenSSL-only: <literal>3des</literal>, <literal>cast5</literal>)
+Values: bf, aes128, aes192, aes256 (OpenSSL-only: <literal>3des</literal>, <literal>cast5</literal>; NSS-only: <literal>3des</literal>)
 Default: aes128
 Applies to: pgp_sym_encrypt, pgp_pub_encrypt
 </literallayout>
@@ -1152,8 +1153,8 @@ gen_random_uuid() returns uuid
    <para>
     <filename>pgcrypto</filename> configures itself according to the findings of the
     main PostgreSQL <literal>configure</literal> script.  The options that
-    affect it are <literal>--with-zlib</literal> and
-    <literal>--with-openssl</literal>.
+    affect it are <literal>--with-zlib</literal>,
+    <literal>--with-openssl</literal> and <literal>--with-nss</literal>.
    </para>
 
    <para>
@@ -1168,14 +1169,16 @@ gen_random_uuid() returns uuid
     BIGNUM functions.
    </para>
 
-   <table id="pgcrypto-with-without-openssl">
-    <title>Summary of Functionality with and without OpenSSL</title>
-    <tgroup cols="3">
+   <table id="pgcrypto-with-without-openssl-nss">
+    <title>Summary of Functionality with and without external cryptographic
+      library</title>
+    <tgroup cols="4">
      <thead>
       <row>
        <entry>Functionality</entry>
        <entry>Built-in</entry>
        <entry>With OpenSSL</entry>
+       <entry>With NSS</entry>
       </row>
      </thead>
      <tbody>
@@ -1183,51 +1186,67 @@ gen_random_uuid() returns uuid
        <entry>MD5</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>SHA1</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>SHA224/256/384/512</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>Other digest algorithms</entry>
        <entry>no</entry>
        <entry>yes (Note 1)</entry>
+       <entry>yes (Note 1)</entry>
       </row>
       <row>
        <entry>Blowfish</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>AES</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>DES/3DES/CAST5</entry>
        <entry>no</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
+      </row>
+      <row>
+       <entry>CAST5</entry>
+       <entry>no</entry>
+       <entry>yes</entry>
+       <entry>no</entry>
       </row>
       <row>
        <entry>Raw encryption</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>PGP Symmetric encryption</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>PGP Public-Key encryption</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
      </tbody>
     </tgroup>
@@ -1240,7 +1259,8 @@ gen_random_uuid() returns uuid
    <orderedlist>
     <listitem>
      <para>
-      Any digest algorithm <productname>OpenSSL</productname> supports
+      Any digest algorithm <productname>OpenSSL</productname> and
+      <productname>NSS</productname> supports
       is automatically picked up.
       This is not possible with ciphers, which need to be supported
       explicitly.
diff --git a/doc/src/sgml/sslinfo.sgml b/doc/src/sgml/sslinfo.sgml
index e16f61b41d..e8a4e7b332 100644
--- a/doc/src/sgml/sslinfo.sgml
+++ b/doc/src/sgml/sslinfo.sgml
@@ -22,7 +22,8 @@
 
  <para>
   This extension won't build at all unless the installation was
-  configured with <literal>--with-openssl</literal>.
+  configured with SSL support, such as <literal>--with-openssl</literal>
+  or <literal>--with-nss</literal>.
  </para>
 
  <sect2>
@@ -208,6 +209,9 @@ emailAddress
      the X.500 and X.509 standards, so you cannot just assign arbitrary
      meaning to them.
     </para>
+    <para>
+     This function is only available when using <productname>OpenSSL</productname>.
+    </para>
     </listitem>
    </varlistentry>
 
@@ -223,6 +227,9 @@ emailAddress
      Same as <function>ssl_client_dn_field</function>, but for the certificate issuer
      rather than the certificate subject.
     </para>
+    <para>
+     This function is only available when using <productname>OpenSSL</productname>.
+    </para>
     </listitem>
    </varlistentry>
 
@@ -238,6 +245,9 @@ emailAddress
      Provide information about extensions of client certificate: extension name,
      extension value, and if it is a critical extension.
     </para>
+    <para>
+     This function is only available when using <productname>OpenSSL</productname>.
+    </para>
     </listitem>
    </varlistentry>
   </variablelist>
diff --git a/src/tools/msvc/Install.pm b/src/tools/msvc/Install.pm
index ea3af48777..afe72a7e97 100644
--- a/src/tools/msvc/Install.pm
+++ b/src/tools/msvc/Install.pm
@@ -438,7 +438,8 @@ sub CopyContribFiles
 		{
 			# These configuration-based exclusions must match vcregress.pl
 			next if ($d eq "uuid-ossp"  && !defined($config->{uuid}));
-			next if ($d eq "sslinfo"    && !defined($config->{openssl}));
+			next if ($d eq "sslinfo"    && !defined($config->{openssl})
+			  && !defined($config->{nss}));
 			next if ($d eq "xml2"       && !defined($config->{xml}));
 			next if ($d =~ /_plperl$/   && !defined($config->{perl}));
 			next if ($d =~ /_plpython$/ && !defined($config->{python}));
diff --git a/src/tools/msvc/Mkvcbuild.pm b/src/tools/msvc/Mkvcbuild.pm
index 29879b51af..379f861a56 100644
--- a/src/tools/msvc/Mkvcbuild.pm
+++ b/src/tools/msvc/Mkvcbuild.pm
@@ -442,9 +442,14 @@ sub mkvcbuild
 		push @contrib_excludes, 'xml2';
 	}
 
+	if (!$solution->{options}->{openssl} && !$solution->{options}->{nss})
+	{
+		push @contrib_excludes, 'sslinfo';
+	}
+
 	if (!$solution->{options}->{openssl})
 	{
-		push @contrib_excludes, 'sslinfo', 'ssl_passphrase_callback';
+		push @contrib_excludes, 'ssl_passphrase_callback';
 	}
 
 	if (!$solution->{options}->{uuid})
@@ -474,6 +479,11 @@ sub mkvcbuild
 		$pgcrypto->AddFiles('contrib/pgcrypto', 'openssl.c',
 			'pgp-mpi-openssl.c');
 	}
+	elsif ($solution->{options}->{nss})
+	{
+		$pgcrypto->AddFiles('contrib/pgcrypto', 'nss.c',
+			'pgp-mpi-internal.c', 'imath.c', 'blf.c');
+	}
 	else
 	{
 		$pgcrypto->AddFiles(
-- 
2.21.1 (Apple Git-122.3)

From c0179ee27513ef22b828680590d84149bca7c2d1 Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Wed, 28 Oct 2020 11:18:42 +0100
Subject: [PATCH v17 1/5] NSS Frontend, Backend and build infrastructure

TODO:
	* SCRAM channel binding is implemented but doesn't work
	* Frontend CRL configuration handling
	* Settle on a required version in autoconf
	* Move pg_nss.h to a .c file for both frontend and backend
---
 configure                                     |  401 +++++-
 configure.ac                                  |   60 +-
 .../postgres_fdw/expected/postgres_fdw.out    |    2 +-
 src/Makefile.global.in                        |    2 +-
 src/backend/libpq/Makefile                    |    6 +-
 src/backend/libpq/auth.c                      |    7 +
 src/backend/libpq/be-secure-nss.c             | 1228 +++++++++++++++++
 src/backend/libpq/be-secure.c                 |    3 +
 src/backend/libpq/hba.c                       |    2 +-
 src/backend/utils/misc/guc.c                  |   20 +-
 src/common/Makefile                           |    2 +-
 src/include/common/pg_nss.h                   |  175 +++
 src/include/libpq/libpq-be.h                  |   15 +-
 src/include/libpq/libpq.h                     |    3 +
 src/include/pg_config.h.in                    |    3 +
 src/include/pg_config_manual.h                |    5 +-
 src/interfaces/libpq/Makefile                 |   13 +-
 src/interfaces/libpq/fe-connect.c             |    4 +
 src/interfaces/libpq/fe-secure-nss.c          | 1080 +++++++++++++++
 src/interfaces/libpq/fe-secure.c              |    5 +-
 src/interfaces/libpq/libpq-fe.h               |   11 +
 src/interfaces/libpq/libpq-int.h              |   18 +-
 src/tools/msvc/Mkvcbuild.pm                   |   22 +-
 src/tools/msvc/Solution.pm                    |   20 +
 src/tools/msvc/config_default.pl              |    1 +
 25 files changed, 3035 insertions(+), 73 deletions(-)
 create mode 100644 src/backend/libpq/be-secure-nss.c
 create mode 100644 src/include/common/pg_nss.h
 create mode 100644 src/interfaces/libpq/fe-secure-nss.c

diff --git a/configure b/configure
index ace4ed5dec..6287a0e2fe 100755
--- a/configure
+++ b/configure
@@ -654,6 +654,9 @@ LIBOBJS
 UUID_LIBS
 LDAP_LIBS_BE
 LDAP_LIBS_FE
+with_ssl
+NSPR_CONFIG
+NSS_CONFIG
 PTHREAD_CFLAGS
 PTHREAD_LIBS
 PTHREAD_CC
@@ -711,7 +714,6 @@ with_uuid
 with_readline
 with_systemd
 with_selinux
-with_openssl
 with_ldap
 with_krb_srvnam
 krb_srvtab
@@ -856,7 +858,6 @@ with_pam
 with_bsd_auth
 with_ldap
 with_bonjour
-with_openssl
 with_selinux
 with_systemd
 with_readline
@@ -868,6 +869,8 @@ with_libxslt
 with_system_tzdata
 with_zlib
 with_gnu_ld
+with_ssl
+with_openssl
 enable_largefile
 '
       ac_precious_vars='build_alias
@@ -1558,7 +1561,6 @@ Optional Packages:
   --with-bsd-auth         build with BSD Authentication support
   --with-ldap             build with LDAP support
   --with-bonjour          build with Bonjour support
-  --with-openssl          build with OpenSSL support
   --with-selinux          build with SELinux support
   --with-systemd          build with systemd support
   --without-readline      do not use GNU Readline nor BSD Libedit for editing
@@ -1572,6 +1574,8 @@ Optional Packages:
                           use system time zone data in DIR
   --without-zlib          do not use Zlib
   --with-gnu-ld           assume the C compiler uses GNU ld [default=no]
+  --with-ssl=LIB          use LIB for SSL/TLS support (openssl, nss)
+  --with-openssl          obsolete spelling of --with-ssl=openssl
 
 Some influential environment variables:
   CC          C compiler command
@@ -8071,41 +8075,6 @@ fi
 $as_echo "$with_bonjour" >&6; }
 
 
-#
-# OpenSSL
-#
-{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether to build with OpenSSL support" >&5
-$as_echo_n "checking whether to build with OpenSSL support... " >&6; }
-
-
-
-# Check whether --with-openssl was given.
-if test "${with_openssl+set}" = set; then :
-  withval=$with_openssl;
-  case $withval in
-    yes)
-
-$as_echo "#define USE_OPENSSL 1" >>confdefs.h
-
-      ;;
-    no)
-      :
-      ;;
-    *)
-      as_fn_error $? "no argument expected for --with-openssl option" "$LINENO" 5
-      ;;
-  esac
-
-else
-  with_openssl=no
-
-fi
-
-
-{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $with_openssl" >&5
-$as_echo "$with_openssl" >&6; }
-
-
 #
 # SELinux
 #
@@ -12179,7 +12148,64 @@ fi
   fi
 fi
 
+#
+# SSL Library
+#
+# There are currently two supported SSL/TLS libraries, OpenSSL and NSS.
+#
+
+
+
+# Check whether --with-ssl was given.
+if test "${with_ssl+set}" = set; then :
+  withval=$with_ssl;
+  case $withval in
+    yes)
+      as_fn_error $? "argument required for --with-ssl option" "$LINENO" 5
+      ;;
+    no)
+      as_fn_error $? "argument required for --with-ssl option" "$LINENO" 5
+      ;;
+    *)
+
+      ;;
+  esac
+
+fi
+
+
+if test x"$with_ssl" = x"" ; then
+  with_ssl=no
+fi
+
+
+
+# Check whether --with-openssl was given.
+if test "${with_openssl+set}" = set; then :
+  withval=$with_openssl;
+  case $withval in
+    yes)
+      :
+      ;;
+    no)
+      :
+      ;;
+    *)
+      as_fn_error $? "no argument expected for --with-openssl option" "$LINENO" 5
+      ;;
+  esac
+
+else
+  with_openssl=no
+
+fi
+
+
 if test "$with_openssl" = yes ; then
+  with_ssl=openssl
+fi
+
+if test "$with_ssl" = openssl ; then
     # Minimum required OpenSSL version is 1.0.1
 
 $as_echo "#define OPENSSL_API_COMPAT 0x10001000L" >>confdefs.h
@@ -12440,8 +12466,280 @@ _ACEOF
 fi
 done
 
+
+$as_echo "#define USE_OPENSSL 1" >>confdefs.h
+
+elif test "$with_ssl" = nss ; then
+  # TODO: fallback in case nss-config/nspr-config aren't found.
+  if test -z "$NSS_CONFIG"; then
+  for ac_prog in nss-config
+do
+  # Extract the first word of "$ac_prog", so it can be a program name with args.
+set dummy $ac_prog; ac_word=$2
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
+$as_echo_n "checking for $ac_word... " >&6; }
+if ${ac_cv_path_NSS_CONFIG+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  case $NSS_CONFIG in
+  [\\/]* | ?:[\\/]*)
+  ac_cv_path_NSS_CONFIG="$NSS_CONFIG" # Let the user override the test with a path.
+  ;;
+  *)
+  as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH
+do
+  IFS=$as_save_IFS
+  test -z "$as_dir" && as_dir=.
+    for ac_exec_ext in '' $ac_executable_extensions; do
+  if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
+    ac_cv_path_NSS_CONFIG="$as_dir/$ac_word$ac_exec_ext"
+    $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
+    break 2
+  fi
+done
+  done
+IFS=$as_save_IFS
+
+  ;;
+esac
+fi
+NSS_CONFIG=$ac_cv_path_NSS_CONFIG
+if test -n "$NSS_CONFIG"; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $NSS_CONFIG" >&5
+$as_echo "$NSS_CONFIG" >&6; }
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
 fi
 
+
+  test -n "$NSS_CONFIG" && break
+done
+
+else
+  # Report the value of NSS_CONFIG in configure's output in all cases.
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for NSS_CONFIG" >&5
+$as_echo_n "checking for NSS_CONFIG... " >&6; }
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $NSS_CONFIG" >&5
+$as_echo "$NSS_CONFIG" >&6; }
+fi
+
+  if test -z "$NSPR_CONFIG"; then
+  for ac_prog in nspr-config
+do
+  # Extract the first word of "$ac_prog", so it can be a program name with args.
+set dummy $ac_prog; ac_word=$2
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
+$as_echo_n "checking for $ac_word... " >&6; }
+if ${ac_cv_path_NSPR_CONFIG+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  case $NSPR_CONFIG in
+  [\\/]* | ?:[\\/]*)
+  ac_cv_path_NSPR_CONFIG="$NSPR_CONFIG" # Let the user override the test with a path.
+  ;;
+  *)
+  as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH
+do
+  IFS=$as_save_IFS
+  test -z "$as_dir" && as_dir=.
+    for ac_exec_ext in '' $ac_executable_extensions; do
+  if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
+    ac_cv_path_NSPR_CONFIG="$as_dir/$ac_word$ac_exec_ext"
+    $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
+    break 2
+  fi
+done
+  done
+IFS=$as_save_IFS
+
+  ;;
+esac
+fi
+NSPR_CONFIG=$ac_cv_path_NSPR_CONFIG
+if test -n "$NSPR_CONFIG"; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $NSPR_CONFIG" >&5
+$as_echo "$NSPR_CONFIG" >&6; }
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+fi
+
+
+  test -n "$NSPR_CONFIG" && break
+done
+
+else
+  # Report the value of NSPR_CONFIG in configure's output in all cases.
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for NSPR_CONFIG" >&5
+$as_echo_n "checking for NSPR_CONFIG... " >&6; }
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $NSPR_CONFIG" >&5
+$as_echo "$NSPR_CONFIG" >&6; }
+fi
+
+  if test -n "$NSS_CONFIG"; then
+    NSS_LIBS=`$NSS_CONFIG --libs`
+	NSS_CFLAGS=`$NSS_CONFIG --cflags`
+  fi
+  if test -n "$NSPR_CONFIG"; then
+	NSPR_LIBS=`$NSPR_CONFIG --libs`
+	NSPR_CFLAGS=`$NSPR_CONFIG --cflags`
+  fi
+
+  LDFLAGS="$LDFLAGS $NSS_LIBS $NSPR_LIBS"
+  CFLAGS="$CFLAGS $NSS_CFLAGS $NSPR_CFLAGS"
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for SSL_VersionRangeSet in -lnss3" >&5
+$as_echo_n "checking for SSL_VersionRangeSet in -lnss3... " >&6; }
+if ${ac_cv_lib_nss3_SSL_VersionRangeSet+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lnss3  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char SSL_VersionRangeSet ();
+int
+main ()
+{
+return SSL_VersionRangeSet ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_lib_nss3_SSL_VersionRangeSet=yes
+else
+  ac_cv_lib_nss3_SSL_VersionRangeSet=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_nss3_SSL_VersionRangeSet" >&5
+$as_echo "$ac_cv_lib_nss3_SSL_VersionRangeSet" >&6; }
+if test "x$ac_cv_lib_nss3_SSL_VersionRangeSet" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_LIBNSS3 1
+_ACEOF
+
+  LIBS="-lnss3 $LIBS"
+
+else
+  as_fn_error $? "library 'nss3' is required for NSS" "$LINENO" 5
+fi
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for PR_GetDefaultIOMethods in -lnspr4" >&5
+$as_echo_n "checking for PR_GetDefaultIOMethods in -lnspr4... " >&6; }
+if ${ac_cv_lib_nspr4_PR_GetDefaultIOMethods+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lnspr4  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char PR_GetDefaultIOMethods ();
+int
+main ()
+{
+return PR_GetDefaultIOMethods ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_lib_nspr4_PR_GetDefaultIOMethods=yes
+else
+  ac_cv_lib_nspr4_PR_GetDefaultIOMethods=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_nspr4_PR_GetDefaultIOMethods" >&5
+$as_echo "$ac_cv_lib_nspr4_PR_GetDefaultIOMethods" >&6; }
+if test "x$ac_cv_lib_nspr4_PR_GetDefaultIOMethods" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_LIBNSPR4 1
+_ACEOF
+
+  LIBS="-lnspr4 $LIBS"
+
+else
+  as_fn_error $? "library 'nspr4' is required for NSS" "$LINENO" 5
+fi
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for SSL_GetImplementedCiphers in -lssl3" >&5
+$as_echo_n "checking for SSL_GetImplementedCiphers in -lssl3... " >&6; }
+if ${ac_cv_lib_ssl3_SSL_GetImplementedCiphers+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lssl3  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char SSL_GetImplementedCiphers ();
+int
+main ()
+{
+return SSL_GetImplementedCiphers ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_lib_ssl3_SSL_GetImplementedCiphers=yes
+else
+  ac_cv_lib_ssl3_SSL_GetImplementedCiphers=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_ssl3_SSL_GetImplementedCiphers" >&5
+$as_echo "$ac_cv_lib_ssl3_SSL_GetImplementedCiphers" >&6; }
+if test "x$ac_cv_lib_ssl3_SSL_GetImplementedCiphers" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_LIBSSL3 1
+_ACEOF
+
+  LIBS="-lssl3 $LIBS"
+
+else
+  as_fn_error $? "library 'ssl3' is required for NSS" "$LINENO" 5
+fi
+
+
+$as_echo "#define USE_NSS 1" >>confdefs.h
+
+elif test "$with_ssl" != no ; then
+  as_fn_error $? "--with-ssl must specify one of openssl or nss" "$LINENO" 5
+fi
+
+
 if test "$with_pam" = yes ; then
   { $as_echo "$as_me:${as_lineno-$LINENO}: checking for pam_start in -lpam" >&5
 $as_echo_n "checking for pam_start in -lpam... " >&6; }
@@ -13327,7 +13625,7 @@ done
 
 fi
 
-if test "$with_openssl" = yes ; then
+if test "$with_ssl" = openssl ; then
   ac_fn_c_check_header_mongrel "$LINENO" "openssl/ssl.h" "ac_cv_header_openssl_ssl_h" "$ac_includes_default"
 if test "x$ac_cv_header_openssl_ssl_h" = xyes; then :
 
@@ -13344,6 +13642,25 @@ else
 fi
 
 
+fi
+
+if test "$with_ssl" = nss ; then
+  ac_fn_c_check_header_mongrel "$LINENO" "nss/ssl.h" "ac_cv_header_nss_ssl_h" "$ac_includes_default"
+if test "x$ac_cv_header_nss_ssl_h" = xyes; then :
+
+else
+  as_fn_error $? "header file <nss/ssl.h> is required for NSS" "$LINENO" 5
+fi
+
+
+  ac_fn_c_check_header_mongrel "$LINENO" "nss/nss.h" "ac_cv_header_nss_nss_h" "$ac_includes_default"
+if test "x$ac_cv_header_nss_nss_h" = xyes; then :
+
+else
+  as_fn_error $? "header file <nss/nss.h> is required for NSS" "$LINENO" 5
+fi
+
+
 fi
 
 if test "$with_pam" = yes ; then
@@ -18061,11 +18378,13 @@ fi
 # in the template or configure command line.
 
 # If not selected manually, try to select a source automatically.
-if test x"$USE_OPENSSL_RANDOM" = x"" && test x"$USE_WIN32_RANDOM" = x"" && test x"$USE_DEV_URANDOM" = x"" ; then
-  if test x"$with_openssl" = x"yes" ; then
+if test x"$USE_OPENSSL_RANDOM" = x"" && test x"$USE_WIN32_RANDOM" = x"" && test x"$USE_DEV_URANDOM" = x"" && test x"$USE_NSS_RANDOM" = x"" ; then
+  if test x"$with_ssl" = x"openssl" ; then
     USE_OPENSSL_RANDOM=1
   elif test "$PORTNAME" = "win32" ; then
     USE_WIN32_RANDOM=1
+  elif test x"$with_ssl" = x"nss" ; then
+    USE_NSS_RANDOM=1
   else
     { $as_echo "$as_me:${as_lineno-$LINENO}: checking for /dev/urandom" >&5
 $as_echo_n "checking for /dev/urandom... " >&6; }
diff --git a/configure.ac b/configure.ac
index 5b91c83fd0..706c9862e7 100644
--- a/configure.ac
+++ b/configure.ac
@@ -852,15 +852,6 @@ PGAC_ARG_BOOL(with, bonjour, no,
 AC_MSG_RESULT([$with_bonjour])
 
 
-#
-# OpenSSL
-#
-AC_MSG_CHECKING([whether to build with OpenSSL support])
-PGAC_ARG_BOOL(with, openssl, no, [build with OpenSSL support],
-              [AC_DEFINE([USE_OPENSSL], 1, [Define to build with OpenSSL support. (--with-openssl)])])
-AC_MSG_RESULT([$with_openssl])
-AC_SUBST(with_openssl)
-
 #
 # SELinux
 #
@@ -1209,7 +1200,21 @@ if test "$with_gssapi" = yes ; then
   fi
 fi
 
+#
+# SSL Library
+#
+# There are currently two supported SSL/TLS libraries, OpenSSL and NSS.
+#
+PGAC_ARG_REQ(with, ssl, [LIB], [use LIB for SSL/TLS support (openssl, nss)])
+if test x"$with_ssl" = x"" ; then
+  with_ssl=no
+fi
+PGAC_ARG_BOOL(with, openssl, no, [obsolete spelling of --with-ssl=openssl])
 if test "$with_openssl" = yes ; then
+  with_ssl=openssl
+fi
+
+if test "$with_ssl" = openssl ; then
   dnl Order matters!
   # Minimum required OpenSSL version is 1.0.1
   AC_DEFINE(OPENSSL_API_COMPAT, [0x10001000L],
@@ -1233,7 +1238,31 @@ if test "$with_openssl" = yes ; then
   # thread-safety. In 1.1.0, it's no longer required, and CRYPTO_lock()
   # function was removed.
   AC_CHECK_FUNCS([CRYPTO_lock])
+  AC_DEFINE([USE_OPENSSL], 1, [Define to 1 if you have OpenSSL support.])
+elif test "$with_ssl" = nss ; then
+  # TODO: fallback in case nss-config/nspr-config aren't found.
+  PGAC_PATH_PROGS(NSS_CONFIG, nss-config)
+  PGAC_PATH_PROGS(NSPR_CONFIG, nspr-config)
+  if test -n "$NSS_CONFIG"; then
+    NSS_LIBS=`$NSS_CONFIG --libs`
+	NSS_CFLAGS=`$NSS_CONFIG --cflags`
+  fi
+  if test -n "$NSPR_CONFIG"; then
+	NSPR_LIBS=`$NSPR_CONFIG --libs`
+	NSPR_CFLAGS=`$NSPR_CONFIG --cflags`
+  fi
+
+  LDFLAGS="$LDFLAGS $NSS_LIBS $NSPR_LIBS"
+  CFLAGS="$CFLAGS $NSS_CFLAGS $NSPR_CFLAGS"
+
+  AC_CHECK_LIB(nss3, SSL_VersionRangeSet, [], [AC_MSG_ERROR([library 'nss3' is required for NSS])])
+  AC_CHECK_LIB(nspr4, PR_GetDefaultIOMethods, [], [AC_MSG_ERROR([library 'nspr4' is required for NSS])])
+  AC_CHECK_LIB(ssl3, SSL_GetImplementedCiphers, [], [AC_MSG_ERROR([library 'ssl3' is required for NSS])])
+  AC_DEFINE([USE_NSS], 1, [Define to 1 if you have NSS support,])
+elif test "$with_ssl" != no ; then
+  AC_MSG_ERROR([--with-ssl must specify one of openssl or nss])
 fi
+AC_SUBST(with_ssl)
 
 if test "$with_pam" = yes ; then
   AC_CHECK_LIB(pam,    pam_start, [], [AC_MSG_ERROR([library 'pam' is required for PAM])])
@@ -1405,11 +1434,16 @@ if test "$with_gssapi" = yes ; then
 	[AC_CHECK_HEADERS(gssapi.h, [], [AC_MSG_ERROR([gssapi.h header file is required for GSSAPI])])])
 fi
 
-if test "$with_openssl" = yes ; then
+if test "$with_ssl" = openssl ; then
   AC_CHECK_HEADER(openssl/ssl.h, [], [AC_MSG_ERROR([header file <openssl/ssl.h> is required for OpenSSL])])
   AC_CHECK_HEADER(openssl/err.h, [], [AC_MSG_ERROR([header file <openssl/err.h> is required for OpenSSL])])
 fi
 
+if test "$with_ssl" = nss ; then
+  AC_CHECK_HEADER(nss/ssl.h, [], [AC_MSG_ERROR([header file <nss/ssl.h> is required for NSS])])
+  AC_CHECK_HEADER(nss/nss.h, [], [AC_MSG_ERROR([header file <nss/nss.h> is required for NSS])])
+fi
+
 if test "$with_pam" = yes ; then
   AC_CHECK_HEADERS(security/pam_appl.h, [],
                    [AC_CHECK_HEADERS(pam/pam_appl.h, [],
@@ -2158,11 +2192,13 @@ fi
 # in the template or configure command line.
 
 # If not selected manually, try to select a source automatically.
-if test x"$USE_OPENSSL_RANDOM" = x"" && test x"$USE_WIN32_RANDOM" = x"" && test x"$USE_DEV_URANDOM" = x"" ; then
-  if test x"$with_openssl" = x"yes" ; then
+if test x"$USE_OPENSSL_RANDOM" = x"" && test x"$USE_WIN32_RANDOM" = x"" && test x"$USE_DEV_URANDOM" = x"" && test x"$USE_NSS_RANDOM" = x"" ; then
+  if test x"$with_ssl" = x"openssl" ; then
     USE_OPENSSL_RANDOM=1
   elif test "$PORTNAME" = "win32" ; then
     USE_WIN32_RANDOM=1
+  elif test x"$with_ssl" = x"nss" ; then
+    USE_NSS_RANDOM=1
   else
     AC_CHECK_FILE([/dev/urandom], [], [])
 
diff --git a/contrib/postgres_fdw/expected/postgres_fdw.out b/contrib/postgres_fdw/expected/postgres_fdw.out
index 2d88d06358..984efc0d7e 100644
--- a/contrib/postgres_fdw/expected/postgres_fdw.out
+++ b/contrib/postgres_fdw/expected/postgres_fdw.out
@@ -8911,7 +8911,7 @@ DO $d$
     END;
 $d$;
 ERROR:  invalid option "password"
-HINT:  Valid options in this context are: service, passfile, channel_binding, connect_timeout, dbname, host, hostaddr, port, options, application_name, keepalives, keepalives_idle, keepalives_interval, keepalives_count, tcp_user_timeout, sslmode, sslcompression, sslcert, sslkey, sslrootcert, sslcrl, requirepeer, ssl_min_protocol_version, ssl_max_protocol_version, gssencmode, krbsrvname, gsslib, target_session_attrs, use_remote_estimate, fdw_startup_cost, fdw_tuple_cost, extensions, updatable, fetch_size
+HINT:  Valid options in this context are: service, passfile, channel_binding, connect_timeout, dbname, host, hostaddr, port, options, application_name, keepalives, keepalives_idle, keepalives_interval, keepalives_count, tcp_user_timeout, sslmode, sslcompression, sslcert, sslkey, sslrootcert, sslcrl, requirepeer, ssl_min_protocol_version, ssl_max_protocol_version, gssencmode, krbsrvname, gsslib, target_session_attrs, cert_database, use_remote_estimate, fdw_startup_cost, fdw_tuple_cost, extensions, updatable, fetch_size
 CONTEXT:  SQL statement "ALTER SERVER loopback_nopw OPTIONS (ADD password 'dummypw')"
 PL/pgSQL function inline_code_block line 3 at EXECUTE
 -- If we add a password for our user mapping instead, we should get a different
diff --git a/src/Makefile.global.in b/src/Makefile.global.in
index 7ca1e9aac5..bdab2a6825 100644
--- a/src/Makefile.global.in
+++ b/src/Makefile.global.in
@@ -183,7 +183,7 @@ with_icu	= @with_icu@
 with_perl	= @with_perl@
 with_python	= @with_python@
 with_tcl	= @with_tcl@
-with_openssl	= @with_openssl@
+with_ssl	= @with_ssl@
 with_readline	= @with_readline@
 with_selinux	= @with_selinux@
 with_systemd	= @with_systemd@
diff --git a/src/backend/libpq/Makefile b/src/backend/libpq/Makefile
index efc5ef760a..045d2c2f6b 100644
--- a/src/backend/libpq/Makefile
+++ b/src/backend/libpq/Makefile
@@ -28,8 +28,12 @@ OBJS = \
 	pqmq.o \
 	pqsignal.o
 
-ifeq ($(with_openssl),yes)
+ifeq ($(with_ssl),openssl)
 OBJS += be-secure-openssl.o
+else
+ifeq ($(with_ssl),nss)
+OBJS += be-secure-nss.o
+endif
 endif
 
 ifeq ($(with_gssapi),yes)
diff --git a/src/backend/libpq/auth.c b/src/backend/libpq/auth.c
index d132c5cb48..d476101583 100644
--- a/src/backend/libpq/auth.c
+++ b/src/backend/libpq/auth.c
@@ -2870,7 +2870,14 @@ CheckCertAuth(Port *port)
 {
 	int			status_check_usermap = STATUS_ERROR;
 
+#if defined(USE_OPENSSL)
 	Assert(port->ssl);
+#elif defined(USE_NSS)
+	/* TODO: should we rename pr_fd to ssl, to keep consistency? */
+	Assert(port->pr_fd);
+#else
+	Assert(false);
+#endif
 
 	/* Make sure we have received a username in the certificate */
 	if (port->peer_cn == NULL ||
diff --git a/src/backend/libpq/be-secure-nss.c b/src/backend/libpq/be-secure-nss.c
new file mode 100644
index 0000000000..755c7c5219
--- /dev/null
+++ b/src/backend/libpq/be-secure-nss.c
@@ -0,0 +1,1228 @@
+/*-------------------------------------------------------------------------
+ *
+ * be-secure-nss.c
+ *	  functions for supporting NSS as a TLS backend
+ *
+ *
+ * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ *	  src/backend/libpq/be-secure-nss.c
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#include "postgres.h"
+
+#include <sys/stat.h>
+
+/*
+ * BITS_PER_BYTE is also defined in the NSPR header files, so we need to undef
+ * our version to avoid compiler warnings on redefinition.
+ */
+#define pg_BITS_PER_BYTE BITS_PER_BYTE
+#undef BITS_PER_BYTE
+
+/*
+ * The nspr/obsolete/protypes.h NSPR header typedefs uint64 and int64 with
+ * colliding definitions from ours, causing a much expected compiler error.
+ * Remove backwards compatibility with ancient NSPR versions to avoid this.
+ */
+#define NO_NSPR_10_SUPPORT
+#include <nspr/nspr.h>
+#include <nspr/prerror.h>
+#include <nspr/prio.h>
+#include <nspr/prmem.h>
+#include <nspr/prtypes.h>
+
+#include <nss/nss.h>
+#include <nss/base64.h>
+#include <nss/cert.h>
+#include <nss/certdb.h>
+#include <nss/hasht.h>
+#include <nss/keyhi.h>
+#include <nss/pk11pub.h>
+#include <nss/secder.h>
+#include <nss/secerr.h>
+#include <nss/secitem.h>
+#include <nss/secoidt.h>
+#include <nss/secport.h>
+#include <nss/ssl.h>
+#include <nss/sslerr.h>
+#include <nss/sslproto.h>
+
+/*
+ * Ensure that the colliding definitions match, else throw an error. In case
+ * NSPR has removed the definition for some reason, make sure to put ours
+ * back again.
+ */
+#if defined(BITS_PER_BYTE)
+#if BITS_PER_BYTE != pg_BITS_PER_BYTE
+#error "incompatible byte widths between NSPR and postgres"
+#endif
+#else
+#define BITS_PER_BYTE pg_BITS_PER_BYTE
+#endif
+#undef pg_BITS_PER_BYTE
+
+#include "common/pg_nss.h"
+#include "lib/stringinfo.h"
+#include "libpq/libpq.h"
+#include "nodes/pg_list.h"
+#include "miscadmin.h"
+#include "storage/fd.h"
+#include "utils/guc.h"
+#include "utils/memutils.h"
+
+
+/* default init hook can be overridden by a shared library */
+static void default_nss_tls_init(bool isServerStart);
+nss_tls_init_hook_type nss_tls_init_hook = default_nss_tls_init;
+
+static PRDescIdentity pr_id;
+
+static PRIOMethods pr_iomethods;
+static NSSInitContext * nss_context = NULL;
+static SSLVersionRange desired_sslver;
+
+static char *external_ssl_passphrase_cb(PK11SlotInfo *slot, PRBool retry, void *arg);
+static bool dummy_ssl_passwd_cb_called = false;
+static bool ssl_is_server_start;
+
+/*
+ * PR_ImportTCPSocket() is a private API, but very widely used, as it's the
+ * only way to make NSS use an already set up POSIX file descriptor rather
+ * than opening one itself. To quote the NSS documentation:
+ *
+ *		"In theory, code that uses PR_ImportTCPSocket may break when NSPR's
+ *		implementation changes. In practice, this is unlikely to happen because
+ *		NSPR's implementation has been stable for years and because of NSPR's
+ *		strong commitment to backward compatibility."
+ *
+ * https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSPR/Reference/PR_ImportTCPSocket
+ *
+ * The function is declared in <private/pprio.h>, but as it is a header marked
+ * private we declare it here rather than including it.
+ */
+NSPR_API(PRFileDesc *) PR_ImportTCPSocket(int);
+
+/* NSS IO layer callback overrides */
+static PRInt32 pg_ssl_read(PRFileDesc * fd, void *buf, PRInt32 amount,
+						   PRIntn flags, PRIntervalTime timeout);
+static PRInt32 pg_ssl_write(PRFileDesc * fd, const void *buf, PRInt32 amount,
+							PRIntn flags, PRIntervalTime timeout);
+/* Utility functions */
+static PRFileDesc * init_iolayer(Port *port);
+static uint16 ssl_protocol_version_to_nss(int v, const char *guc_name);
+
+static char *pg_SSLerrmessage(PRErrorCode errcode);
+static char *ssl_protocol_version_to_string(int v);
+static SECStatus pg_cert_auth_handler(void *arg, PRFileDesc * fd,
+									  PRBool checksig, PRBool isServer);
+static SECStatus pg_bad_cert_handler(void *arg, PRFileDesc * fd);
+static char *dummy_ssl_passphrase_cb(PK11SlotInfo * slot, PRBool retry, void *arg);
+
+/* ------------------------------------------------------------ */
+/*						 Public interface						*/
+/* ------------------------------------------------------------ */
+
+/*
+ * be_tls_init
+ *			Initialize the nss TLS library in the postmaster
+ *
+ * The majority of the setup needs to happen in be_tls_open_server since the
+ * NSPR initialization must happen after the forking of the backend. We could
+ * potentially move some parts in under !isServerStart, but so far this is the
+ * separation chosen.
+ */
+int
+be_tls_init(bool isServerStart)
+{
+	SECStatus	status;
+	SSLVersionRange supported_sslver;
+
+	/*
+	 * Set up the connection cache for multi-processing application behavior.
+	 * If we are in ServerStart then we initialize the cache. If the server is
+	 * already started, we inherit the cache such that it can be used for
+	 * connections. Calling SSL_ConfigMPServerSIDCache sets an environment
+	 * variable which contains enough information for the forked child to know
+	 * how to access it.  Passing NULL to SSL_InheritMPServerSIDCache will
+	 * make the forked child look it up by the default name SSL_INHERITANCE,
+	 * if env vars aren't inherited then the contents of the variable can be
+	 * passed instead.
+	 */
+	if (isServerStart)
+	{
+		/*
+		 * SSLv2 and SSLv3 are disabled in this TLS backend, but when setting
+		 * up the required session cache for NSS we still must supply timeout
+		 * values for v2 and The minimum allowed value for both is 5 seconds,
+		 * so opt for that in both cases (the defaults being 100 seconds and
+		 * 24 hours).
+		 *
+		 * Passing NULL as the directory for the session cache will default to
+		 * using /tmp on UNIX and \\temp on Windows.  Deciding if we want to
+		 * keep closer control on this directory is left as a TODO.
+		 */
+		status = SSL_ConfigMPServerSIDCache(MaxConnections, 5, 5, NULL);
+		if (status != SECSuccess)
+			ereport(FATAL,
+					(errmsg("unable to set up TLS connection cache: %s",
+							pg_SSLerrmessage(PR_GetError()))));
+
+	}
+	else
+	{
+		status = SSL_InheritMPServerSIDCache(NULL);
+		if (status != SECSuccess)
+		{
+			ereport(LOG,
+					(errmsg("unable to connect to TLS connection cache: %s",
+							pg_SSLerrmessage(PR_GetError()))));
+			return -1;
+		}
+	}
+
+	if (!ssl_database || strlen(ssl_database) == 0)
+	{
+		ereport(isServerStart ? FATAL : LOG,
+				(errmsg("no certificate database specified")));
+		goto error;
+	}
+
+	/*
+	 * We check for the desired TLS version range here, even though we cannot
+	 * set it until be_open_server such that we can be compatible with how the
+	 * OpenSSL backend reports errors for incompatible range configurations.
+	 * Set either the default supported TLS version range, or the configured
+	 * range from ssl_min_protocol_version and ssl_max_protocol version. In
+	 * case the user hasn't defined the maximum allowed version we fall back
+	 * to the highest version TLS that the library supports.
+	 */
+	if (SSL_VersionRangeGetSupported(ssl_variant_stream, &supported_sslver) != SECSuccess)
+	{
+		ereport(isServerStart ? FATAL : LOG,
+				(errmsg("unable to get default protocol support from NSS")));
+		goto error;
+	}
+
+	/*
+	 * Set the fallback versions for the TLS protocol version range to a
+	 * combination of our minimal requirement and the library maximum.
+	 */
+	desired_sslver.min = SSL_LIBRARY_VERSION_TLS_1_0;
+	desired_sslver.max = supported_sslver.max;
+
+	if (ssl_min_protocol_version)
+	{
+		int			ver = ssl_protocol_version_to_nss(ssl_min_protocol_version,
+													  "ssl_min_protocol_version");
+
+		if (ver == -1)
+		{
+			ereport(isServerStart ? FATAL : LOG,
+					(errmsg("\"%s\" setting \"%s\" not supported by this build",
+							"ssl_min_protocol_version",
+							GetConfigOption("ssl_min_protocol_version",
+											false, false))));
+			goto error;
+		}
+
+		if (ver > 0)
+			desired_sslver.min = ver;
+	}
+
+	if (ssl_max_protocol_version)
+	{
+		int			ver = ssl_protocol_version_to_nss(ssl_max_protocol_version,
+													  "ssl_max_protocol_version");
+
+		if (ver == -1)
+		{
+			ereport(isServerStart ? FATAL : LOG,
+					(errmsg("\"%s\" setting \"%s\" not supported by this build",
+							"ssl_max_protocol_version",
+							GetConfigOption("ssl_max_protocol_version",
+											false, false))));
+			goto error;
+		}
+		if (ver > 0)
+			desired_sslver.max = ver;
+
+		if (ver < desired_sslver.min)
+		{
+			ereport(isServerStart ? FATAL : LOG,
+					(errmsg("could not set SSL protocol version range"),
+					 errdetail("\"%s\" cannot be higher than \"%s\"",
+							   "ssl_min_protocol_version",
+							   "ssl_max_protocol_version")));
+			goto error;
+		}
+	}
+
+	/*
+	 * Set the passphrase callback which will be used both to obtain the
+	 * passphrase from the user, as well as by NSS to obtain the phrase
+	 * repeatedly.
+	 */
+	ssl_is_server_start = isServerStart;
+	(*nss_tls_init_hook) (isServerStart);
+
+	return 0;
+error:
+	return -1;
+}
+
+int
+be_tls_open_server(Port *port)
+{
+	SECStatus	status;
+	PRFileDesc *model;
+	PRFileDesc *pr_fd;
+	PRFileDesc *layer;
+	CERTCertificate *server_cert;
+	SECKEYPrivateKey *private_key;
+	CERTSignedCrl *crl;
+	SECItem		crlname;
+	char	   *cert_database;
+	NSSInitParameters params;
+
+	/*
+	 * The NSPR documentation states that runtime initialization via PR_Init
+	 * is no longer required, as the first caller into NSPR will perform the
+	 * initialization implicitly. The documentation doesn't however clarify
+	 * from which version this is holds true, so let's perform the potentially
+	 * superfluous initialization anyways to avoid crashing on older versions
+	 * of NSPR, as there is no difference in overhead.  The NSS documentation
+	 * still states that PR_Init must be called in some way (implicitly or
+	 * explicitly).
+	 *
+	 * The below parameters are what the implicit initialization would've done
+	 * for us, and should work even for older versions where it might not be
+	 * done automatically. The last parameter, maxPTDs, is set to various
+	 * values in other codebases, but has been unused since NSPR 2.1 which was
+	 * released sometime in 1998. In current versions of NSPR all parameters
+	 * are ignored.
+	 */
+	PR_Init(PR_USER_THREAD, PR_PRIORITY_NORMAL, 0 /* maxPTDs */ );
+
+	/*
+	 * The certificate path (configdir) must contain a valid NSS database. If
+	 * the certificate path isn't a valid directory, NSS will fall back on the
+	 * system certificate database. If the certificate path is a directory but
+	 * is empty then the initialization will fail. On the client side this can
+	 * be allowed for any sslmode but the verify-xxx ones.
+	 * https://bugzilla.redhat.com/show_bug.cgi?id=728562 For the server side
+	 * we wont allow this to fail however, as we require the certificate and
+	 * key to exist.
+	 *
+	 * The original design of NSS was for a single application to use a single
+	 * copy of it, initialized with NSS_Initialize() which isn't returning any
+	 * handle with which to refer to NSS. NSS initialization and shutdown are
+	 * global for the application, so a shutdown in another NSS enabled
+	 * library would cause NSS to be stopped for libpq as well.  The fix has
+	 * been to introduce NSS_InitContext which returns a context handle to
+	 * pass to NSS_ShutdownContext.  NSS_InitContext was introduced in NSS
+	 * 3.12, but the use of it is not very well documented.
+	 * https://bugzilla.redhat.com/show_bug.cgi?id=738456
+	 *
+	 * The InitParameters struct passed can be used to override internal
+	 * values in NSS, but the usage is not documented at all. When using
+	 * NSS_Init initializations, the values are instead set via PK11_Configure
+	 * calls so the PK11_Configure documentation can be used to glean some
+	 * details on these.
+	 *
+	 * https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS/PKCS11/Module_Specs
+	 */
+	memset(&params, '\0', sizeof(params));
+	params.length = sizeof(params);
+
+	if (!ssl_database || strlen(ssl_database) == 0)
+		ereport(FATAL,
+				(errmsg("no certificate database specified")));
+
+	cert_database = psprintf("sql:%s", ssl_database);
+	nss_context = NSS_InitContext(cert_database, "", "", "",
+								  &params,
+								  NSS_INIT_READONLY | NSS_INIT_PK11RELOAD);
+	pfree(cert_database);
+
+	if (!nss_context)
+		ereport(FATAL,
+				(errmsg("unable to read certificate database \"%s\": %s",
+						ssl_database, pg_SSLerrmessage(PR_GetError()))));
+
+	/*
+	 * Import the already opened socket as we don't want to use NSPR functions
+	 * for opening the network socket due to how the PostgreSQL protocol works
+	 * with TLS connections. This function is not part of the NSPR public API,
+	 * see the comment at the top of the file for the rationale of still using
+	 * it.
+	 */
+	pr_fd = PR_ImportTCPSocket(port->sock);
+	if (!pr_fd)
+		ereport(ERROR,
+				(errmsg("unable to connect to socket")));
+
+	/*
+	 * Most of the documentation available, and implementations of, NSS/NSPR
+	 * use the PR_NewTCPSocket() function here, which has the drawback that it
+	 * can only create IPv4 sockets. Instead use PR_OpenTCPSocket() which
+	 * copes with IPv6 as well.
+	 *
+	 * We use a model filedescriptor here which is a construct in NSPR/NSS in
+	 * order to create a configuration template for sockets which can then be
+	 * applied to new sockets created. This makes more sense in a server which
+	 * accepts multiple connections and want to perform the boilerplate just
+	 * once, but it does provide a nice abstraction here aswell in that we can
+	 * error out early without having performed any operation on the real
+	 * socket.
+	 */
+	model = PR_OpenTCPSocket(port->laddr.addr.ss_family);
+	if (!model)
+		ereport(ERROR,
+				(errmsg("unable to open socket")));
+
+	/*
+	 * Convert the NSPR socket to an SSL socket. Ensuring the success of this
+	 * operation is critical as NSS SSL_* functions may return SECSuccess on
+	 * the socket even though SSL hasn't been enabled, which introduce a risk
+	 * of silent downgrades.
+	 */
+	model = SSL_ImportFD(NULL, model);
+	if (!model)
+		ereport(ERROR,
+				(errmsg("unable to enable TLS on socket")));
+
+	/*
+	 * Configure basic settings for the connection over the SSL socket in
+	 * order to set it up as a server.
+	 */
+	if (SSL_OptionSet(model, SSL_SECURITY, PR_TRUE) != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to configure TLS connection")));
+
+	if (SSL_OptionSet(model, SSL_HANDSHAKE_AS_SERVER, PR_TRUE) != SECSuccess ||
+		SSL_OptionSet(model, SSL_HANDSHAKE_AS_CLIENT, PR_FALSE) != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to configure TLS connection as server")));
+
+	/*
+	 * SSLv2 is disabled by default, and SSLv3 will be excluded from the range
+	 * of allowed protocols further down. Since we really don't want these to
+	 * ever be enabled, let's use belts and suspenders and explicitly turn
+	 * them off as well.
+	 */
+	SSL_OptionSet(model, SSL_ENABLE_SSL2, PR_FALSE);
+	SSL_OptionSet(model, SSL_ENABLE_SSL3, PR_FALSE);
+
+#ifdef SSL_CBC_RANDOM_IV
+
+	/*
+	 * Enable protection against the BEAST attack in case the NSS server has
+	 * support for that. While SSLv3 is disabled, we may still allow TLSv1
+	 * which is affected. The option isn't documented as an SSL option, but as
+	 * an NSS environment variable.
+	 */
+	SSL_OptionSet(model, SSL_CBC_RANDOM_IV, PR_TRUE);
+#endif
+
+	/*
+	 * Configure the allowed ciphers. If there are no user preferred suites,
+	 * set the domestic policy.
+	 *
+	 * Historically there were different cipher policies based on export (and
+	 * import) restrictions: Domestic, Export and France. These are since long
+	 * removed with all ciphers being enabled by default. Due to backwards
+	 * compatibility, the old API is still used even though all three policies
+	 * now do the same thing.
+	 *
+	 * If SSLCipherSuites define a policy of the user, we set that rather than
+	 * enabling all ciphers via NSS_SetDomesticPolicy.
+	 *
+	 * TODO: while this code works, the set of ciphers which can be set and
+	 * still end up with a working socket is woefully underdocumented for
+	 * anything more recent than SSLv3 (the code for TLS actually calls ssl3
+	 * functions under the hood for SSL_CipherPrefSet), so it's unclear if this
+	 * is helpful or not. Using the policies works, but may be too coarsely
+	 * grained.
+	 *
+	 * Another TODO: The SSL_ImplementedCiphers table returned with calling
+	 * SSL_GetImplementedCiphers is sorted in server preference order. Sorting
+	 * SSLCipherSuites according to the order of the ciphers therein could be
+	 * a way to implement ssl_prefer_server_ciphers - if we at all want to use
+	 * cipher selection for NSS like how we do it for OpenSSL that is.
+	 */
+
+	/*
+	 * If no ciphers are specified, enable them all.
+	 */
+	if (!SSLCipherSuites || strlen(SSLCipherSuites) == 0)
+	{
+		status = NSS_SetDomesticPolicy();
+		if (status != SECSuccess)
+			ereport(ERROR,
+					(errmsg("unable to set cipher policy: %s",
+							pg_SSLerrmessage(PR_GetError()))));
+	}
+	else
+	{
+		char	   *ciphers,
+				   *c;
+
+		char	   *sep = ":;, ";
+		PRUint16	ciphercode;
+		const		PRUint16 *nss_ciphers;
+
+		/*
+		 * If the user has specified a set of preferred cipher suites we start
+		 * by turning off all the existing suites to avoid the risk of down-
+		 * grades to a weaker cipher than expected.
+		 */
+		nss_ciphers = SSL_GetImplementedCiphers();
+		for (int i = 0; i < SSL_GetNumImplementedCiphers(); i++)
+			SSL_CipherPrefSet(model, nss_ciphers[i], PR_FALSE);
+
+		ciphers = pstrdup(SSLCipherSuites);
+
+		for (c = strtok(ciphers, sep); c; c = strtok(NULL, sep))
+		{
+			ciphercode = pg_find_cipher(c);
+			if (ciphercode != INVALID_CIPHER)
+			{
+				status = SSL_CipherPrefSet(model, ciphercode, PR_TRUE);
+				if (status != SECSuccess)
+					ereport(ERROR,
+							(errmsg("invalid cipher-suite specified: %s", c)));
+			}
+		}
+
+		pfree(ciphers);
+	}
+
+	if (SSL_VersionRangeSet(model, &desired_sslver) != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to set requested SSL protocol version range")));
+
+	/*
+	 * Set up the custom IO layer.
+	 */
+	layer = init_iolayer(port);
+	if (!layer)
+		goto error;
+
+	/* Store the Port as private data available in callbacks */
+	layer->secret = (void *) port;
+
+	if (PR_PushIOLayer(pr_fd, PR_TOP_IO_LAYER, layer) != PR_SUCCESS)
+	{
+		PR_Close(layer);
+		ereport(ERROR,
+				(errmsg("unable to push IO layer")));
+	}
+
+	server_cert = PK11_FindCertFromNickname(ssl_cert_file, (void *) port);
+	if (!server_cert)
+	{
+		if (dummy_ssl_passwd_cb_called)
+			ereport(ERROR,
+					(errmsg("unable to load certificate for \"%s\": %s",
+							ssl_cert_file, pg_SSLerrmessage(PR_GetError())),
+					 errhint("The certificate requires a password.")));
+		else
+			ereport(ERROR,
+					(errmsg("unable to find certificate for \"%s\": %s",
+							ssl_cert_file, pg_SSLerrmessage(PR_GetError()))));
+	}
+
+	private_key = PK11_FindKeyByAnyCert(server_cert, (void *) port);
+	if (!private_key)
+	{
+		if (dummy_ssl_passwd_cb_called)
+			ereport(ERROR,
+					(errmsg("unable to load private key for \"%s\": %s",
+							ssl_cert_file, pg_SSLerrmessage(PR_GetError())),
+					 errhint("The private key requires a password.")));
+		else
+			ereport(ERROR,
+					(errmsg("unable to find private key for \"%s\": %s",
+							ssl_cert_file, pg_SSLerrmessage(PR_GetError()))));
+	}
+
+	/*
+	 * NSS doesn't use CRL files on disk, so we use the ssl_crl_file guc to
+	 * contain the CRL nickname for the current server certificate in the NSS
+	 * certificate database. The main difference from the OpenSSL backend is
+	 * that NSS will use the CRL regardless, but being able to make sure the
+	 * CRL is loaded seems like a good feature.
+	 */
+	if (ssl_crl_file[0])
+	{
+		SECITEM_CopyItem(NULL, &crlname, &server_cert->derSubject);
+		crl = SEC_FindCrlByName(CERT_GetDefaultCertDB(), &crlname, SEC_CRL_TYPE);
+		if (!crl)
+			ereport(ERROR,
+					(errmsg("specified CRL not found in database")));
+		SEC_DestroyCrl(crl);
+	}
+
+	/*
+	 * Finally we must configure the socket for being a server by setting the
+	 * certificate and key. The NULL parameter is an SSLExtraServerCertData
+	 * pointer with the final parameter being the size of the extra server
+	 * cert data structure pointed to. This is typically only used for
+	 * credential delegation.
+	 */
+	status = SSL_ConfigServerCert(model, server_cert, private_key, NULL, 0);
+	if (status != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to configure server for TLS server connections: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+
+	ssl_loaded_verify_locations = true;
+
+	/*
+	 * At this point, we no longer have use for the certificate and private
+	 * key as they have been copied into the context by NSS. Destroy our
+	 * copies explicitly to clean out the memory as best we can.
+	 */
+	CERT_DestroyCertificate(server_cert);
+	SECKEY_DestroyPrivateKey(private_key);
+
+	status = SSL_AuthCertificateHook(model, pg_cert_auth_handler, (void *) port);
+	if (status != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to install authcert hook: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+	SSL_BadCertHook(model, pg_bad_cert_handler, (void *) port);
+	SSL_OptionSet(model, SSL_REQUEST_CERTIFICATE, PR_TRUE);
+	SSL_OptionSet(model, SSL_REQUIRE_CERTIFICATE, PR_FALSE);
+
+	port->pr_fd = SSL_ImportFD(model, pr_fd);
+	if (!port->pr_fd)
+		ereport(ERROR,
+				(errmsg("unable to initialize")));
+
+	PR_Close(model);
+
+	/*
+	 * Force a handshake on the next I/O request, the second parameter means
+	 * that we are a server, PR_FALSE would indicate being a client. NSPR
+	 * requires us to call SSL_ResetHandshake since we imported an already
+	 * established socket.
+	 */
+	status = SSL_ResetHandshake(port->pr_fd, PR_TRUE);
+	if (status != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to initiate handshake: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+	status = SSL_ForceHandshake(port->pr_fd);
+	if (status != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to handshake: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+
+	port->ssl_in_use = true;
+	return 0;
+
+error:
+	return 1;
+}
+
+ssize_t
+be_tls_read(Port *port, void *ptr, size_t len, int *waitfor)
+{
+	ssize_t		n_read;
+	PRErrorCode err;
+
+	n_read = PR_Read(port->pr_fd, ptr, len);
+
+	if (n_read < 0)
+	{
+		err = PR_GetError();
+
+		if (err == PR_WOULD_BLOCK_ERROR)
+		{
+			*waitfor = WL_SOCKET_READABLE;
+			errno = EWOULDBLOCK;
+		}
+		else
+			errno = ECONNRESET;
+	}
+
+	return n_read;
+}
+
+ssize_t
+be_tls_write(Port *port, void *ptr, size_t len, int *waitfor)
+{
+	ssize_t		n_write;
+	PRErrorCode err;
+	PRIntn		flags = 0;
+
+	/*
+	 * The flags parameter to PR_Send is no longer used and is, according to
+	 * the documentation, required to be zero.
+	 */
+	n_write = PR_Send(port->pr_fd, ptr, len, flags, PR_INTERVAL_NO_WAIT);
+
+	if (n_write < 0)
+	{
+		err = PR_GetError();
+
+		if (err == PR_WOULD_BLOCK_ERROR)
+		{
+			*waitfor = WL_SOCKET_WRITEABLE;
+			errno = EWOULDBLOCK;
+		}
+		else
+			errno = ECONNRESET;
+	}
+
+	return n_write;
+}
+
+void
+be_tls_close(Port *port)
+{
+	if (!port)
+		return;
+
+	if (port->peer_cn)
+	{
+		SSL_InvalidateSession(port->pr_fd);
+		pfree(port->peer_cn);
+		port->peer_cn = NULL;
+	}
+
+	PR_Close(port->pr_fd);
+	port->pr_fd = NULL;
+	port->ssl_in_use = false;
+
+	if (nss_context)
+	{
+		NSS_ShutdownContext(nss_context);
+		nss_context = NULL;
+	}
+}
+
+void
+be_tls_destroy(void)
+{
+	/*
+	 * It reads a bit odd to clear a session cache when we are destroying the
+	 * context altogether, but if the session cache isn't cleared before
+	 * shutting down the context it will fail with SEC_ERROR_BUSY.
+	 */
+	SSL_ClearSessionCache();
+}
+
+int
+be_tls_get_cipher_bits(Port *port)
+{
+	SECStatus	status;
+	SSLChannelInfo channel;
+	SSLCipherSuiteInfo suite;
+
+	status = SSL_GetChannelInfo(port->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+		goto error;
+
+	status = SSL_GetCipherSuiteInfo(channel.cipherSuite, &suite, sizeof(suite));
+	if (status != SECSuccess)
+		goto error;
+
+	return suite.effectiveKeyBits;
+
+error:
+	ereport(WARNING,
+			(errmsg("unable to extract TLS session information: %s",
+					pg_SSLerrmessage(PR_GetError()))));
+	return 0;
+}
+
+/*
+ * be_tls_get_compression
+ *
+ * NSS disabled support for TLS compression in version 3.33 and removed the
+ * code in a subsequent release. The API for retrieving information about
+ * compression as well as enabling it is kept for backwards compatibility, but
+ * we don't need to consult it since it was only available for SSLv3 which we
+ * don't support.
+ *
+ * https://bugzilla.mozilla.org/show_bug.cgi?id=1409587
+ */
+bool
+be_tls_get_compression(Port *port)
+{
+	return false;
+}
+
+/*
+ * be_tls_get_version
+ *
+ * Returns the protocol version used for the current connection, or NULL in
+ * case of errors.
+ */
+const char *
+be_tls_get_version(Port *port)
+{
+	SECStatus	status;
+	SSLChannelInfo channel;
+
+	status = SSL_GetChannelInfo(port->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+	{
+		ereport(WARNING,
+				(errmsg("unable to extract TLS session information: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+		return NULL;
+	}
+
+	return ssl_protocol_version_to_string(channel.protocolVersion);
+}
+
+const char *
+be_tls_get_cipher(Port *port)
+{
+	SECStatus	status;
+	SSLChannelInfo channel;
+	SSLCipherSuiteInfo suite;
+
+	status = SSL_GetChannelInfo(port->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+		goto error;
+
+	status = SSL_GetCipherSuiteInfo(channel.cipherSuite, &suite, sizeof(suite));
+	if (status != SECSuccess)
+		goto error;
+
+	return suite.cipherSuiteName;
+
+error:
+	ereport(WARNING,
+			(errmsg("unable to extract TLS session information: %s",
+					pg_SSLerrmessage(PR_GetError()))));
+	return NULL;
+}
+
+void
+be_tls_get_peer_subject_name(Port *port, char *ptr, size_t len)
+{
+	CERTCertificate *certificate;
+
+	certificate = SSL_PeerCertificate(port->pr_fd);
+	if (certificate)
+		strlcpy(ptr, CERT_NameToAscii(&certificate->subject), len);
+	else
+		ptr[0] = '\0';
+}
+
+void
+be_tls_get_peer_issuer_name(Port *port, char *ptr, size_t len)
+{
+	CERTCertificate *certificate;
+
+	certificate = SSL_PeerCertificate(port->pr_fd);
+	if (certificate)
+		strlcpy(ptr, CERT_NameToAscii(&certificate->issuer), len);
+	else
+		ptr[0] = '\0';
+}
+
+void
+be_tls_get_peer_serial(Port *port, char *ptr, size_t len)
+{
+	CERTCertificate *certificate;
+
+	certificate = SSL_PeerCertificate(port->pr_fd);
+	if (certificate)
+		snprintf(ptr, len, "%li", DER_GetInteger(&(certificate->serialNumber)));
+	else
+		ptr[0] = '\0';
+}
+
+char *
+be_tls_get_certificate_hash(Port *port, size_t *len)
+{
+	CERTCertificate	   *certificate;
+	SECOidTag			signature_alg;
+	SECOidTag			digest_alg;
+	int					digest_len;
+	SECStatus			status;
+	PLArenaPool		   *arena = NULL;
+	SECItem				digest;
+	char			   *ret;
+
+	*len = 0;
+	certificate = SSL_LocalCertificate(port->pr_fd);
+	if (!certificate)
+		return NULL;
+
+	signature_alg = SECOID_GetAlgorithmTag(&certificate->signature);
+	/* Set sha-256 as a default */
+	digest_alg = SEC_OID_SHA256;
+	digest_len = SHA256_LENGTH;
+
+	while (NSS_SCRAMDigestAlgorithm->signature)
+	{
+		if (signature_alg == NSS_SCRAMDigestAlgorithm->signature)
+		{
+			digest_alg = NSS_SCRAMDigestAlgorithm->hash;
+			digest_len = NSS_SCRAMDigestAlgorithm->len;
+			break;
+		}
+	}
+
+	arena = PORT_NewArena(SEC_ASN1_DEFAULT_ARENA_SIZE);
+	digest.data = PORT_ArenaZAlloc(arena, sizeof(unsigned char) * digest_len);
+	digest.len = digest_len;
+
+	status = PK11_HashBuf(digest_alg, digest.data,
+						  certificate->derCert.data,
+						  certificate->derCert.len);
+
+	if (status != SECSuccess)
+	{
+		PORT_FreeArena(arena, PR_TRUE);
+		return NULL;
+	}
+
+	ret = pstrdup((char *) digest.data);
+	*len = digest_len;
+	PORT_FreeArena(arena, PR_TRUE);
+
+	return ret;
+}
+
+/* ------------------------------------------------------------ */
+/*						Internal functions						*/
+/* ------------------------------------------------------------ */
+
+/*
+ * default_nss_tls_init
+ *
+ * The default TLS init hook function which users can override for installing
+ * their own passphrase callbacks and similar actions. In case no callback has
+ * been configured, or the callback isn't reload capable during a server
+ * reload, the dummy callback will be installed.
+ *
+ * The private data for the callback is set differently depending on how it's
+ * invoked. For calls which may invoke the callback deeper in the callstack
+ * the private data is set with SSL_SetPKCS11PinArg. When the call is directly
+ * invoking the callback, like PK11_FindCertFromNickname, then the private
+ * data is passed as a parameter. Setting the data with SSL_SetPKCS11PinArg is
+ * thus not required but good practice.
+ *
+ * NSS doesn't provide a default callback like OpenSSL does, but a callback is
+ * required to be set.  The password callback can be installed at any time, but
+ * setting the private data with SSL_SetPKCS11PinArg requires a PR Filedesc.
+ */
+static void
+default_nss_tls_init(bool isServerStart)
+{
+	/*
+	 * No user-defined callback has been configured, install the dummy call-
+	 * back since we must set something.
+	 */
+	if (!ssl_passphrase_command[0])
+		PK11_SetPasswordFunc(dummy_ssl_passphrase_cb);
+	else
+	{
+		/*
+		 * There is a user-defined callback, set it unless we are in a restart
+		 * and cannot handle restarts due to an interactive callback.
+		 */
+		if (isServerStart)
+			PK11_SetPasswordFunc(external_ssl_passphrase_cb);
+		else
+		{
+			if (ssl_passphrase_command_supports_reload)
+				PK11_SetPasswordFunc(external_ssl_passphrase_cb);
+			else
+				PK11_SetPasswordFunc(dummy_ssl_passphrase_cb);
+		}
+	}
+}
+
+/*
+ * external_ssl_passphrase_cb
+ *
+ * Runs the callback configured by ssl_passphrase_command and returns the
+ * captured password back to NSS.
+ */
+static char *
+external_ssl_passphrase_cb(PK11SlotInfo *slot, PRBool retry, void *arg)
+{
+	/*
+	 * NSS use a hardcoded 256 byte buffer for reading the password so set the
+	 * same limit for our callback buffer.
+	 */
+	char		buf[256];
+	int			len;
+	char	   *password = NULL;
+	char	   *prompt;
+
+	/*
+	 * Since there is no password callback in NSS when the server starts up,
+	 * it makes little sense to create an interactive callback. Thus, if this
+	 * is a retry attempt then give up immediately.
+	 */
+	if (retry)
+		return NULL;
+
+	/*
+	 * Construct the same prompt that NSS uses internally even though it is
+	 * unlikely to serve much purpose, but we must set a prompt so we might
+	 * as well do it right.
+	 */
+	prompt = psprintf("Enter Password or Pin for \"%s\":",
+					  PK11_GetTokenName(slot));
+
+	len = run_ssl_passphrase_command(prompt, ssl_is_server_start, buf, sizeof(buf));
+	pfree(prompt);
+
+	if (!len)
+		return NULL;
+
+	/*
+	 * At least one byte with password content was returned, and NSS requires
+	 * that we return it allocated in NSS controlled memory. If we fail to
+	 * allocate then abort without passing back NULL and bubble up the error
+	 * on the PG side.
+	 */
+	password = (char *) PR_Malloc(len + 1);
+	if (!password)
+	{
+		explicit_bzero(buf, sizeof(buf));
+		ereport(ERROR,
+				(errcode(ERRCODE_OUT_OF_MEMORY),
+				 errmsg("out of memory")));
+	}
+	strlcpy(password, buf, sizeof(password));
+	explicit_bzero(buf, sizeof(buf));
+
+	return password;
+}
+
+/*
+ * dummy_ssl_passphrase_cb
+ *
+ * Return unsuccessful if we are asked to provide the passphrase for a cert or
+ * key, without having a passphrase callback installed.
+ */
+static char *
+dummy_ssl_passphrase_cb(PK11SlotInfo *slot, PRBool retry, void *arg)
+{
+	dummy_ssl_passwd_cb_called = true;
+	return NULL;
+}
+
+static SECStatus
+pg_bad_cert_handler(void *arg, PRFileDesc * fd)
+{
+	Port	   *port = (Port *) arg;
+
+	port->peer_cert_valid = false;
+	return SECFailure;
+}
+
+static SECStatus
+pg_cert_auth_handler(void *arg, PRFileDesc * fd, PRBool checksig, PRBool isServer)
+{
+	SECStatus	status;
+	Port	   *port = (Port *) arg;
+	CERTCertificate *cert;
+	char	   *peer_cn;
+	int			len;
+
+	status = SSL_AuthCertificate(CERT_GetDefaultCertDB(), port->pr_fd, checksig, PR_TRUE);
+	if (status == SECSuccess)
+	{
+		cert = SSL_PeerCertificate(port->pr_fd);
+		len = strlen(cert->subjectName);
+		peer_cn = MemoryContextAllocZero(TopMemoryContext, len + 1);
+		/*
+		 * Skip over the key= portion of the key=value containing the the
+		 * peer CN.
+		 */
+		if (strncmp(cert->subjectName, "CN=", 3) == 0)
+			strlcpy(peer_cn, cert->subjectName + strlen("CN="), len + 1);
+		else
+			strlcpy(peer_cn, cert->subjectName, len + 1);
+		CERT_DestroyCertificate(cert);
+
+		port->peer_cn = peer_cn;
+		port->peer_cert_valid = true;
+	}
+
+	return status;
+}
+
+static PRInt32
+pg_ssl_read(PRFileDesc *fd, void *buf, PRInt32 amount, PRIntn flags,
+			PRIntervalTime timeout)
+{
+	PRRecvFN	read_fn;
+	PRInt32		n_read;
+
+	read_fn = fd->lower->methods->recv;
+	n_read = read_fn(fd->lower, buf, amount, flags, timeout);
+
+	return n_read;
+}
+
+static PRInt32
+pg_ssl_write(PRFileDesc *fd, const void *buf, PRInt32 amount, PRIntn flags,
+			 PRIntervalTime timeout)
+{
+	PRSendFN	send_fn;
+	PRInt32		n_write;
+
+	send_fn = fd->lower->methods->send;
+	n_write = send_fn(fd->lower, buf, amount, flags, timeout);
+
+	return n_write;
+}
+
+static PRFileDesc *
+init_iolayer(Port *port)
+{
+	const		PRIOMethods *default_methods;
+	PRFileDesc *layer;
+
+	/*
+	 * Start by initializing our layer with all the default methods so that we
+	 * can selectively override the ones we want while still ensuring that we
+	 * have a complete layer specification.
+	 */
+	default_methods = PR_GetDefaultIOMethods();
+	memcpy(&pr_iomethods, default_methods, sizeof(PRIOMethods));
+
+	pr_iomethods.recv = pg_ssl_read;
+	pr_iomethods.send = pg_ssl_write;
+
+	/*
+	 * Each IO layer must be identified by a unique name, where uniqueness is
+	 * per connection. Each connection in a postgres cluster can generate the
+	 * identity from the same string as they will create their IO layers on
+	 * different sockets. Only one layer per socket can have the same name.
+	 */
+	pr_id = PR_GetUniqueIdentity("PostgreSQL Server");
+	if (pr_id == PR_INVALID_IO_LAYER)
+	{
+		ereport(ERROR,
+				(errmsg("out of memory when setting up TLS connection")));
+		return NULL;
+	}
+
+	/*
+	 * Create the actual IO layer as a stub such that it can be pushed onto
+	 * the layer stack. The step via a stub is required as we define custom
+	 * callbacks.
+	 */
+	layer = PR_CreateIOLayerStub(pr_id, &pr_iomethods);
+	if (!layer)
+	{
+		ereport(ERROR,
+				(errmsg("unable to create NSS I/O layer")));
+		return NULL;
+	}
+
+	return layer;
+}
+
+static char *
+ssl_protocol_version_to_string(int v)
+{
+	switch (v)
+	{
+			/* SSL v2 and v3 are not supported */
+		case SSL_LIBRARY_VERSION_2:
+		case SSL_LIBRARY_VERSION_3_0:
+			Assert(false);
+			break;
+
+		case SSL_LIBRARY_VERSION_TLS_1_0:
+			return pstrdup("TLSv1.0");
+		case SSL_LIBRARY_VERSION_TLS_1_1:
+			return pstrdup("TLSv1.1");
+		case SSL_LIBRARY_VERSION_TLS_1_2:
+			return pstrdup("TLSv1.2");
+		case SSL_LIBRARY_VERSION_TLS_1_3:
+			return pstrdup("TLSv1.3");
+	}
+
+	return pstrdup("unknown");
+}
+
+
+/*
+ * ssl_protocol_version_to_nss
+ *			Translate PostgreSQL TLS version to NSS version
+ *
+ * Returns zero in case the requested TLS version is undefined (PG_ANY) and
+ * should be set by the caller, or -1 on failure.
+ */
+static uint16
+ssl_protocol_version_to_nss(int v, const char *guc_name)
+{
+	switch (v)
+	{
+			/*
+			 * There is no SSL_LIBRARY_ macro defined in NSS with the value
+			 * zero, so we use this to signal the caller that the highest
+			 * useful version should be set on the connection.
+			 */
+		case PG_TLS_ANY:
+			return 0;
+
+			/*
+			 * No guard is required here as there are no versions of NSS
+			 * without support for TLS1.
+			 */
+		case PG_TLS1_VERSION:
+			return SSL_LIBRARY_VERSION_TLS_1_0;
+		case PG_TLS1_1_VERSION:
+#ifdef SSL_LIBRARY_VERSION_TLS_1_1
+			return SSL_LIBRARY_VERSION_TLS_1_1;
+#else
+			break;
+#endif
+		case PG_TLS1_2_VERSION:
+#ifdef SSL_LIBRARY_VERSION_TLS_1_2
+			return SSL_LIBRARY_VERSION_TLS_1_2;
+#else
+			break;
+#endif
+		case PG_TLS1_3_VERSION:
+#ifdef SSL_LIBRARY_VERSION_TLS_1_3
+			return SSL_LIBRARY_VERSION_TLS_1_3;
+#else
+			break;
+#endif
+		default:
+			break;
+	}
+
+	return -1;
+}
+
+/*
+ * pg_SSLerrmessage
+ *		Create and return a human readable error message given
+ *		the specified error code
+ *
+ * PR_ErrorToName only converts the enum identifier of the error to string,
+ * but that can be quite useful for debugging (and in case PR_ErrorToString is
+ * unable to render a message then we at least have something).
+ */
+static char *
+pg_SSLerrmessage(PRErrorCode errcode)
+{
+	return psprintf("%s (%s)",
+					PR_ErrorToString(errcode, PR_LANGUAGE_I_DEFAULT),
+					PR_ErrorToName(errcode));
+}
diff --git a/src/backend/libpq/be-secure.c b/src/backend/libpq/be-secure.c
index 2ae507a902..f39977b80c 100644
--- a/src/backend/libpq/be-secure.c
+++ b/src/backend/libpq/be-secure.c
@@ -49,6 +49,9 @@ bool		ssl_passphrase_command_supports_reload;
 #ifdef USE_SSL
 bool		ssl_loaded_verify_locations = false;
 #endif
+#ifdef USE_NSS
+char	   *ssl_database;
+#endif
 
 /* GUC variable controlling SSL cipher list */
 char	   *SSLCipherSuites = NULL;
diff --git a/src/backend/libpq/hba.c b/src/backend/libpq/hba.c
index 3a78d2043e..eb1b028464 100644
--- a/src/backend/libpq/hba.c
+++ b/src/backend/libpq/hba.c
@@ -1040,7 +1040,7 @@ parse_hba_line(TokenizedLine *tok_line, int elevel)
 			ereport(elevel,
 					(errcode(ERRCODE_CONFIG_FILE_ERROR),
 					 errmsg("hostssl record cannot match because SSL is not supported by this build"),
-					 errhint("Compile with --with-openssl to use SSL connections."),
+					 errhint("Compile with --with-openssl or --with-nss to use SSL connections."),
 					 errcontext("line %d of configuration file \"%s\"",
 								line_num, HbaFileName)));
 			*err_msg = "hostssl record cannot match because SSL is not supported by this build";
diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c
index a62d64eaa4..050f673c68 100644
--- a/src/backend/utils/misc/guc.c
+++ b/src/backend/utils/misc/guc.c
@@ -4262,7 +4262,11 @@ static struct config_string ConfigureNamesString[] =
 		},
 		&ssl_library,
 #ifdef USE_SSL
+#if defined(USE_OPENSSL)
 		"OpenSSL",
+#elif defined(USE_NSS)
+		"NSS",
+#endif
 #else
 		"",
 #endif
@@ -4320,6 +4324,18 @@ static struct config_string ConfigureNamesString[] =
 		check_canonical_path, assign_pgstat_temp_directory, NULL
 	},
 
+#ifdef USE_NSS
+	{
+		{"ssl_database", PGC_SIGHUP, CONN_AUTH_SSL,
+			gettext_noop("Location of the NSS certificate database."),
+			NULL
+		},
+		&ssl_database,
+		"",
+		NULL, NULL, NULL
+	},
+#endif
+
 	{
 		{"synchronous_standby_names", PGC_SIGHUP, REPLICATION_PRIMARY,
 			gettext_noop("Number of synchronous standbys and list of names of potential synchronous ones."),
@@ -4348,8 +4364,10 @@ static struct config_string ConfigureNamesString[] =
 			GUC_SUPERUSER_ONLY
 		},
 		&SSLCipherSuites,
-#ifdef USE_OPENSSL
+#if defined(USE_OPENSSL)
 		"HIGH:MEDIUM:+3DES:!aNULL",
+#elif defined (USE_NSS)
+		"",
 #else
 		"none",
 #endif
diff --git a/src/common/Makefile b/src/common/Makefile
index 25c55bd642..614f93af09 100644
--- a/src/common/Makefile
+++ b/src/common/Makefile
@@ -79,7 +79,7 @@ OBJS_COMMON = \
 	wait_error.o \
 	wchar.o
 
-ifeq ($(with_openssl),yes)
+ifeq ($(with_ssl),openssl)
 OBJS_COMMON += \
 	protocol_openssl.o \
 	sha2_openssl.o
diff --git a/src/include/common/pg_nss.h b/src/include/common/pg_nss.h
new file mode 100644
index 0000000000..26c767c391
--- /dev/null
+++ b/src/include/common/pg_nss.h
@@ -0,0 +1,175 @@
+/*-------------------------------------------------------------------------
+ *
+ * pg_nss.h
+ *	  Support for NSS as a TLS backend
+ *
+ * These definitions are used by both frontend and backend code.
+ *
+ * Copyright (c) 2020, PostgreSQL Global Development Group
+ *
+ * IDENTIFICATION
+ *        src/include/common/pg_nss.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef PG_NSS_H
+#define PG_NSS_H
+
+#ifdef USE_NSS
+
+#include <nss/hasht.h>
+#include <nss/secoidt.h>
+#include <nss/sslproto.h>
+
+PRUint16	pg_find_cipher(char *name);
+
+typedef struct
+{
+	SECOidTag	signature;
+	SECOidTag	hash;
+	int			len;
+}			NSSSignatureAlgorithms;
+
+typedef struct
+{
+	const char *name;
+	PRUint16	number;
+}			NSSCiphers;
+
+#define INVALID_CIPHER	0xFFFF
+
+static const NSSSignatureAlgorithms NSS_SCRAMDigestAlgorithm[] = {
+
+	{SEC_OID_PKCS1_MD5_WITH_RSA_ENCRYPTION, SEC_OID_SHA256, SHA256_LENGTH},
+	{SEC_OID_PKCS1_SHA1_WITH_RSA_ENCRYPTION, SEC_OID_SHA256, SHA256_LENGTH},
+	{SEC_OID_ISO_SHA_WITH_RSA_SIGNATURE, SEC_OID_SHA256, SHA256_LENGTH},
+	{SEC_OID_ISO_SHA1_WITH_RSA_SIGNATURE, SEC_OID_SHA256, SHA256_LENGTH},
+	{SEC_OID_PKCS5_PBE_WITH_MD5_AND_DES_CBC, SEC_OID_SHA256, SHA256_LENGTH},
+
+	{SEC_OID_ANSIX962_ECDSA_SHA224_SIGNATURE, SEC_OID_SHA224, SHA224_LENGTH},
+	{SEC_OID_PKCS1_SHA224_WITH_RSA_ENCRYPTION, SEC_OID_SHA224, SHA224_LENGTH},
+	{SEC_OID_NIST_DSA_SIGNATURE_WITH_SHA224_DIGEST, SEC_OID_SHA224, SHA224_LENGTH},
+
+	{SEC_OID_ANSIX962_ECDSA_SHA256_SIGNATURE, SEC_OID_SHA256, SHA256_LENGTH},
+	{SEC_OID_PKCS1_SHA256_WITH_RSA_ENCRYPTION, SEC_OID_SHA256, SHA256_LENGTH},
+	{SEC_OID_NIST_DSA_SIGNATURE_WITH_SHA256_DIGEST, SEC_OID_SHA256, SHA256_LENGTH},
+
+	{SEC_OID_ANSIX962_ECDSA_SHA384_SIGNATURE, SEC_OID_SHA384, SHA384_LENGTH},
+	{SEC_OID_PKCS1_SHA384_WITH_RSA_ENCRYPTION, SEC_OID_SHA384, SHA384_LENGTH},
+
+	{SEC_OID_ANSIX962_ECDSA_SHA512_SIGNATURE, SEC_OID_SHA512, SHA512_LENGTH},
+	{SEC_OID_PKCS1_SHA512_WITH_RSA_ENCRYPTION, SEC_OID_SHA512, SHA512_LENGTH},
+
+	{0, 0}
+};
+
+/*
+ * This list is a partial copy of the ciphers in NSS files lib/ssl/sslproto.h
+ * in order to provide a human readable version of the ciphers. It would be
+ * nice to not have to have this, but NSS doesn't provide any API addressing
+ * the ciphers by name. TODO: do we want more of the ciphers, or perhaps less?
+ */
+static const NSSCiphers NSS_CipherList[] = {
+
+	{"TLS_NULL_WITH_NULL_NULL", TLS_NULL_WITH_NULL_NULL},
+
+	{"TLS_RSA_WITH_NULL_MD5", TLS_RSA_WITH_NULL_MD5},
+	{"TLS_RSA_WITH_NULL_SHA", TLS_RSA_WITH_NULL_SHA},
+	{"TLS_RSA_WITH_RC4_128_MD5", TLS_RSA_WITH_RC4_128_MD5},
+	{"TLS_RSA_WITH_RC4_128_SHA", TLS_RSA_WITH_RC4_128_SHA},
+	{"TLS_RSA_WITH_IDEA_CBC_SHA", TLS_RSA_WITH_IDEA_CBC_SHA},
+	{"TLS_RSA_WITH_DES_CBC_SHA", TLS_RSA_WITH_DES_CBC_SHA},
+	{"TLS_RSA_WITH_3DES_EDE_CBC_SHA", TLS_RSA_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_DH_DSS_WITH_DES_CBC_SHA", TLS_DH_DSS_WITH_DES_CBC_SHA},
+	{"TLS_DH_DSS_WITH_3DES_EDE_CBC_SHA", TLS_DH_DSS_WITH_3DES_EDE_CBC_SHA},
+	{"TLS_DH_RSA_WITH_DES_CBC_SHA", TLS_DH_RSA_WITH_DES_CBC_SHA},
+	{"TLS_DH_RSA_WITH_3DES_EDE_CBC_SHA", TLS_DH_RSA_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_DHE_DSS_WITH_DES_CBC_SHA", TLS_DHE_DSS_WITH_DES_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_3DES_EDE_CBC_SHA", TLS_DHE_DSS_WITH_3DES_EDE_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_DES_CBC_SHA", TLS_DHE_RSA_WITH_DES_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA", TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_DH_anon_WITH_RC4_128_MD5", TLS_DH_anon_WITH_RC4_128_MD5},
+	{"TLS_DH_anon_WITH_DES_CBC_SHA", TLS_DH_anon_WITH_DES_CBC_SHA},
+	{"TLS_DH_anon_WITH_3DES_EDE_CBC_SHA", TLS_DH_anon_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_RSA_WITH_AES_128_CBC_SHA", TLS_RSA_WITH_AES_128_CBC_SHA},
+	{"TLS_DH_DSS_WITH_AES_128_CBC_SHA", TLS_DH_DSS_WITH_AES_128_CBC_SHA},
+	{"TLS_DH_RSA_WITH_AES_128_CBC_SHA", TLS_DH_RSA_WITH_AES_128_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_AES_128_CBC_SHA", TLS_DHE_DSS_WITH_AES_128_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_AES_128_CBC_SHA", TLS_DHE_RSA_WITH_AES_128_CBC_SHA},
+	{"TLS_DH_anon_WITH_AES_128_CBC_SHA", TLS_DH_anon_WITH_AES_128_CBC_SHA},
+
+	{"TLS_RSA_WITH_AES_256_CBC_SHA", TLS_RSA_WITH_AES_256_CBC_SHA},
+	{"TLS_DH_DSS_WITH_AES_256_CBC_SHA", TLS_DH_DSS_WITH_AES_256_CBC_SHA},
+	{"TLS_DH_RSA_WITH_AES_256_CBC_SHA", TLS_DH_RSA_WITH_AES_256_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_AES_256_CBC_SHA", TLS_DHE_DSS_WITH_AES_256_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_AES_256_CBC_SHA", TLS_DHE_RSA_WITH_AES_256_CBC_SHA},
+	{"TLS_DH_anon_WITH_AES_256_CBC_SHA", TLS_DH_anon_WITH_AES_256_CBC_SHA},
+	{"TLS_RSA_WITH_NULL_SHA256", TLS_RSA_WITH_NULL_SHA256},
+	{"TLS_RSA_WITH_AES_128_CBC_SHA256", TLS_RSA_WITH_AES_128_CBC_SHA256},
+	{"TLS_RSA_WITH_AES_256_CBC_SHA256", TLS_RSA_WITH_AES_256_CBC_SHA256},
+
+	{"TLS_DHE_DSS_WITH_AES_128_CBC_SHA256", TLS_DHE_DSS_WITH_AES_128_CBC_SHA256},
+	{"TLS_RSA_WITH_CAMELLIA_128_CBC_SHA", TLS_RSA_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DH_DSS_WITH_CAMELLIA_128_CBC_SHA", TLS_DH_DSS_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DH_RSA_WITH_CAMELLIA_128_CBC_SHA", TLS_DH_RSA_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_CAMELLIA_128_CBC_SHA", TLS_DHE_DSS_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA", TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DH_anon_WITH_CAMELLIA_128_CBC_SHA", TLS_DH_anon_WITH_CAMELLIA_128_CBC_SHA},
+
+	{"TLS_DHE_DSS_WITH_RC4_128_SHA", TLS_DHE_DSS_WITH_RC4_128_SHA},
+	{"TLS_DHE_RSA_WITH_AES_128_CBC_SHA256", TLS_DHE_RSA_WITH_AES_128_CBC_SHA256},
+	{"TLS_DHE_DSS_WITH_AES_256_CBC_SHA256", TLS_DHE_DSS_WITH_AES_256_CBC_SHA256},
+	{"TLS_DHE_RSA_WITH_AES_256_CBC_SHA256", TLS_DHE_RSA_WITH_AES_256_CBC_SHA256},
+
+	{"TLS_RSA_WITH_CAMELLIA_256_CBC_SHA", TLS_RSA_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DH_DSS_WITH_CAMELLIA_256_CBC_SHA", TLS_DH_DSS_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DH_RSA_WITH_CAMELLIA_256_CBC_SHA", TLS_DH_RSA_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_CAMELLIA_256_CBC_SHA", TLS_DHE_DSS_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA", TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DH_anon_WITH_CAMELLIA_256_CBC_SHA", TLS_DH_anon_WITH_CAMELLIA_256_CBC_SHA},
+
+	{"TLS_RSA_WITH_SEED_CBC_SHA", TLS_RSA_WITH_SEED_CBC_SHA},
+
+	{"TLS_RSA_WITH_AES_128_GCM_SHA256", TLS_RSA_WITH_AES_128_GCM_SHA256},
+	{"TLS_RSA_WITH_AES_256_GCM_SHA384", TLS_RSA_WITH_AES_256_GCM_SHA384},
+	{"TLS_DHE_RSA_WITH_AES_128_GCM_SHA256", TLS_DHE_RSA_WITH_AES_128_GCM_SHA256},
+	{"TLS_DHE_RSA_WITH_AES_256_GCM_SHA384", TLS_DHE_RSA_WITH_AES_256_GCM_SHA384},
+	{"TLS_DHE_DSS_WITH_AES_128_GCM_SHA256", TLS_DHE_DSS_WITH_AES_128_GCM_SHA256},
+	{"TLS_DHE_DSS_WITH_AES_256_GCM_SHA384", TLS_DHE_DSS_WITH_AES_256_GCM_SHA384},
+
+	{"TLS_AES_128_GCM_SHA256", TLS_AES_128_GCM_SHA256},
+	{"TLS_AES_256_GCM_SHA384", TLS_AES_256_GCM_SHA384},
+	{"TLS_CHACHA20_POLY1305_SHA256", TLS_CHACHA20_POLY1305_SHA256},
+	{NULL, 0}
+};
+
+/*
+ * pg_find_cipher
+ *			Translate an NSS ciphername to the cipher code
+ *
+ * Searches the configured ciphers for the corresponding cipher code to the
+ * name. Search is performed case insensitive.
+ */
+PRUint16
+pg_find_cipher(char *name)
+{
+	const		NSSCiphers *cipher_list = NSS_CipherList;
+
+	while (cipher_list->name)
+	{
+		if (pg_strcasecmp(cipher_list->name, name) == 0)
+			return cipher_list->number;
+
+		cipher_list++;
+	}
+
+	return 0xFFFF;
+}
+
+#endif							/* USE_NSS */
+
+#endif							/* PG_NSS_H */
diff --git a/src/include/libpq/libpq-be.h b/src/include/libpq/libpq-be.h
index 0a23281ad5..74f88b628e 100644
--- a/src/include/libpq/libpq-be.h
+++ b/src/include/libpq/libpq-be.h
@@ -192,13 +192,18 @@ typedef struct Port
 	bool		peer_cert_valid;
 
 	/*
-	 * OpenSSL structures. (Keep these last so that the locations of other
-	 * fields are the same whether or not you build with OpenSSL.)
+	 * SSL backend specific structures. (Keep these last so that the locations
+	 * of other fields are the same whether or not you build with SSL
+	 * enabled.)
 	 */
 #ifdef USE_OPENSSL
 	SSL		   *ssl;
 	X509	   *peer;
 #endif
+
+#ifdef USE_NSS
+	void	   *pr_fd;
+#endif
 } Port;
 
 #ifdef USE_SSL
@@ -282,7 +287,7 @@ extern void be_tls_get_peer_serial(Port *port, char *ptr, size_t len);
  * This is not supported with old versions of OpenSSL that don't have
  * the X509_get_signature_nid() function.
  */
-#if defined(USE_OPENSSL) && defined(HAVE_X509_GET_SIGNATURE_NID)
+#if defined(USE_NSS) || (defined(USE_OPENSSL) && defined(HAVE_X509_GET_SIGNATURE_NID))
 #define HAVE_BE_TLS_GET_CERTIFICATE_HASH
 extern char *be_tls_get_certificate_hash(Port *port, size_t *len);
 #endif
@@ -292,6 +297,10 @@ extern char *be_tls_get_certificate_hash(Port *port, size_t *len);
 typedef void (*openssl_tls_init_hook_typ) (SSL_CTX *context, bool isServerStart);
 extern PGDLLIMPORT openssl_tls_init_hook_typ openssl_tls_init_hook;
 #endif
+#ifdef USE_NSS
+typedef void (*nss_tls_init_hook_type) (bool isServerStart);
+extern PGDLLIMPORT nss_tls_init_hook_type nss_tls_init_hook;
+#endif
 
 #endif							/* USE_SSL */
 
diff --git a/src/include/libpq/libpq.h b/src/include/libpq/libpq.h
index b1152475ac..298d87ecae 100644
--- a/src/include/libpq/libpq.h
+++ b/src/include/libpq/libpq.h
@@ -88,6 +88,9 @@ extern PGDLLIMPORT bool ssl_passphrase_command_supports_reload;
 #ifdef USE_SSL
 extern bool ssl_loaded_verify_locations;
 #endif
+#ifdef USE_NSS
+extern char *ssl_database;
+#endif
 
 extern int	secure_initialize(bool isServerStart);
 extern bool secure_loaded_verify_locations(void);
diff --git a/src/include/pg_config.h.in b/src/include/pg_config.h.in
index fb270df678..31f808398c 100644
--- a/src/include/pg_config.h.in
+++ b/src/include/pg_config.h.in
@@ -893,6 +893,9 @@
 /* Define to 1 to build with PAM support. (--with-pam) */
 #undef USE_PAM
 
+/* Define to build with NSS support (--with-nss) */
+#undef USE_NSS
+
 /* Define to 1 to use software CRC-32C implementation (slicing-by-8). */
 #undef USE_SLICING_BY_8_CRC32C
 
diff --git a/src/include/pg_config_manual.h b/src/include/pg_config_manual.h
index 705dc69c06..c28b84126d 100644
--- a/src/include/pg_config_manual.h
+++ b/src/include/pg_config_manual.h
@@ -176,10 +176,9 @@
 
 /*
  * USE_SSL code should be compiled only when compiling with an SSL
- * implementation.  (Currently, only OpenSSL is supported, but we might add
- * more implementations in the future.)
+ * implementation.
  */
-#ifdef USE_OPENSSL
+#if defined(USE_OPENSSL) || defined(USE_NSS)
 #define USE_SSL
 #endif
 
diff --git a/src/interfaces/libpq/Makefile b/src/interfaces/libpq/Makefile
index 4ac5f4b340..e902f38c8e 100644
--- a/src/interfaces/libpq/Makefile
+++ b/src/interfaces/libpq/Makefile
@@ -45,12 +45,21 @@ OBJS = \
 	pqexpbuffer.o \
 	fe-auth.o
 
-ifeq ($(with_openssl),yes)
+ifneq ($(with_ssl),no)
+OBJS += \
+	fe-secure-common.o
+endif
+
+ifeq ($(with_ssl),openssl)
 OBJS += \
-	fe-secure-common.o \
 	fe-secure-openssl.o
 endif
 
+ifeq ($(with_ssl), nss)
+OBJS += \
+	fe-secure-nss.o
+endif
+
 ifeq ($(with_gssapi),yes)
 OBJS += \
 	fe-gssapi-common.o \
diff --git a/src/interfaces/libpq/fe-connect.c b/src/interfaces/libpq/fe-connect.c
index e7781d010f..8188401659 100644
--- a/src/interfaces/libpq/fe-connect.c
+++ b/src/interfaces/libpq/fe-connect.c
@@ -355,6 +355,10 @@ static const internalPQconninfoOption PQconninfoOptions[] = {
 		"Target-Session-Attrs", "", 11, /* sizeof("read-write") = 11 */
 	offsetof(struct pg_conn, target_session_attrs)},
 
+	{"cert_database", NULL, NULL, NULL,
+		"CertificateDatabase", "", 64,
+	offsetof(struct pg_conn, cert_database)},
+
 	/* Terminating entry --- MUST BE LAST */
 	{NULL, NULL, NULL, NULL,
 	NULL, NULL, 0}
diff --git a/src/interfaces/libpq/fe-secure-nss.c b/src/interfaces/libpq/fe-secure-nss.c
new file mode 100644
index 0000000000..fbddba8083
--- /dev/null
+++ b/src/interfaces/libpq/fe-secure-nss.c
@@ -0,0 +1,1080 @@
+/*-------------------------------------------------------------------------
+ *
+ * fe-secure-nss.c
+ *	  functions for supporting NSS as a TLS backend for frontend libpq
+ *
+ * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ *	  src/interfaces/libpq/fe-secure-nss.c
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#include "postgres_fe.h"
+
+#include "libpq-fe.h"
+#include "fe-auth.h"
+#include "fe-secure-common.h"
+#include "libpq-int.h"
+#include "common/pg_nss.h"
+
+/*
+ * BITS_PER_BYTE is also defined in the NSPR header files, so we need to undef
+ * our version to avoid compiler warnings on redefinition.
+ */
+#define pg_BITS_PER_BYTE BITS_PER_BYTE
+#undef BITS_PER_BYTE
+
+/*
+ * The nspr/obsolete/protypes.h NSPR header typedefs uint64 and int64 with
+ * colliding definitions from ours, causing a much expected compiler error.
+ * Remove backwards compatibility with ancient NSPR versions to avoid this.
+ */
+#define NO_NSPR_10_SUPPORT
+#include <nspr/nspr.h>
+#include <nspr/prerror.h>
+#include <nspr/prinit.h>
+#include <nspr/prio.h>
+#include <nss/hasht.h>
+#include <nss/nss.h>
+#include <nss/ssl.h>
+#include <nss/sslproto.h>
+#include <nss/pk11func.h>
+#include <nss/secerr.h>
+#include <nss/secoidt.h>
+#include <nss/secmod.h>
+
+/*
+ * Ensure that the colliding definitions match, else throw an error. In case
+ * NSPR remove the definition in a future version (however unlikely that may
+ * be, make sure to put ours back again.
+ */
+#if defined(BITS_PER_BYTE)
+#if BITS_PER_BYTE != pg_BITS_PER_BYTE
+#error "incompatible byte widths between NSPR and PostgreSQL"
+#endif
+#else
+#define BITS_PER_BYTE pg_BITS_PER_BYTE
+#endif
+#undef pg_BITS_PER_BYTE
+
+static SECStatus pg_load_nss_module(SECMODModule * *module, const char *library, const char *name);
+static SECStatus pg_bad_cert_handler(void *arg, PRFileDesc * fd);
+static const char *pg_SSLerrmessage(PRErrorCode errcode);
+static SECStatus pg_client_auth_handler(void *arg, PRFileDesc * socket, CERTDistNames * caNames,
+										CERTCertificate * *pRetCert, SECKEYPrivateKey * *pRetKey);
+static SECStatus pg_cert_auth_handler(void *arg, PRFileDesc * fd, PRBool checksig, PRBool isServer);
+static int	ssl_protocol_version_to_nss(const char *protocol);
+static bool cert_database_has_CA(PGconn *conn);
+
+static char *PQssl_passwd_cb(PK11SlotInfo * slot, PRBool retry, void *arg);
+
+/*
+ * PR_ImportTCPSocket() is a private API, but very widely used, as it's the
+ * only way to make NSS use an already set up POSIX file descriptor rather
+ * than opening one itself. To quote the NSS documentation:
+ *
+ *		"In theory, code that uses PR_ImportTCPSocket may break when NSPR's
+ *		implementation changes. In practice, this is unlikely to happen because
+ *		NSPR's implementation has been stable for years and because of NSPR's
+ *		strong commitment to backward compatibility."
+ *
+ * https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSPR/Reference/PR_ImportTCPSocket
+ *
+ * The function is declared in <private/pprio.h>, but as it is a header marked
+ * private we declare it here rather than including it.
+ */
+NSPR_API(PRFileDesc *) PR_ImportTCPSocket(int);
+
+static SECMODModule * ca_trust = NULL;
+static NSSInitContext * nss_context = NULL;
+
+/*
+ * This logic exist in NSS as well, but it's only available for when there is
+ * a database to open, and not only using the system trust store. Thus, we
+ * need to keep our own copy.
+ */
+#if defined(WIN32)
+static const char *ca_trust_name = "nssckbi.dll";
+#elif defined(__darwin__)
+static const char *ca_trust_name = "libnssckbi.dylib";
+#else
+static const char *ca_trust_name = "libnssckbi.so";
+#endif
+
+static PQsslKeyPassHook_nss_type PQsslKeyPassHook = NULL;
+
+/* ------------------------------------------------------------ */
+/*			 Procedures common to all secure sessions			*/
+/* ------------------------------------------------------------ */
+
+/*
+ * pgtls_init_library
+ *
+ * There is no direct equivalent for PQinitOpenSSL in NSS/NSPR, with PR_Init
+ * being the closest match there is. PR_Init is however already documented to
+ * not be required so simply making this a noop seems like the best option.
+ */
+void
+pgtls_init_library(bool do_ssl, int do_crypto)
+{
+	/* noop */
+}
+
+int
+pgtls_init(PGconn *conn)
+{
+	conn->ssl_in_use = false;
+	conn->has_password = false;
+
+	return 0;
+}
+
+void
+pgtls_close(PGconn *conn)
+{
+	if (nss_context)
+	{
+		NSS_ShutdownContext(nss_context);
+		nss_context = NULL;
+	}
+}
+
+PostgresPollingStatusType
+pgtls_open_client(PGconn *conn)
+{
+	SECStatus	status;
+	PRFileDesc *pr_fd;
+	PRFileDesc *model;
+	NSSInitParameters params;
+	SSLVersionRange desired_range;
+
+	/*
+	 * The NSPR documentation states that runtime initialization via PR_Init
+	 * is no longer required, as the first caller into NSPR will perform the
+	 * initialization implicitly. See be-secure-nss.c for further discussion
+	 * on PR_Init.
+	 */
+	PR_Init(PR_USER_THREAD, PR_PRIORITY_NORMAL, 0);
+
+	/*
+	 * NSS initialization and the use of contexts is further discussed in
+	 * be-secure-nss.c
+	 */
+	memset(&params, 0, sizeof(params));
+	params.length = sizeof(params);
+
+	if (conn->cert_database && strlen(conn->cert_database) > 0)
+	{
+		char	   *cert_database_path = psprintf("sql:%s", conn->cert_database);
+
+		nss_context = NSS_InitContext(cert_database_path, "", "", "",
+									  &params,
+									  NSS_INIT_READONLY | NSS_INIT_PK11RELOAD);
+		pfree(cert_database_path);
+
+		if (!nss_context)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to open certificate database \"%s\": %s"),
+						  conn->cert_database,
+						  pg_SSLerrmessage(PR_GetError()));
+			return PGRES_POLLING_FAILED;
+		}
+	}
+	else
+	{
+		nss_context = NSS_InitContext("", "", "", "", &params,
+									  NSS_INIT_READONLY | NSS_INIT_NOCERTDB |
+									  NSS_INIT_NOMODDB | NSS_INIT_FORCEOPEN |
+									  NSS_INIT_NOROOTINIT | NSS_INIT_PK11RELOAD);
+		if (!nss_context)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("unable to create certificate database: %s"),
+							  pg_SSLerrmessage(PR_GetError()));
+			return PGRES_POLLING_FAILED;
+		}
+	}
+
+	/*
+	 * Configure cipher policy.
+	 */
+	status = NSS_SetDomesticPolicy();
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to configure cipher policy: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * If we don't have a certificate database, the system trust store is the
+	 * fallback we can use. If we fail to initialize that as well, we can
+	 * still attempt a connection as long as the sslmode isn't verify*.
+	 */
+	if (!conn->cert_database && conn->sslmode[0] == 'v')
+	{
+		status = pg_load_nss_module(&ca_trust, ca_trust_name, "\"Root Certificates\"");
+		if (status != SECSuccess)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("WARNING: unable to load NSS trust module \"%s\" : %s"),
+							  ca_trust_name,
+							  pg_SSLerrmessage(PR_GetError()));
+
+			return PGRES_POLLING_FAILED;
+		}
+	}
+
+
+	PK11_SetPasswordFunc(PQssl_passwd_cb);
+
+	/*
+	 * Import the already opened socket as we don't want to use NSPR functions
+	 * for opening the network socket due to how the PostgreSQL protocol works
+	 * with TLS connections. This function is not part of the NSPR public API,
+	 * see the comment at the top of the file for the rationale of still using
+	 * it.
+	 */
+	pr_fd = PR_ImportTCPSocket(conn->sock);
+	if (!pr_fd)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to attach to socket: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * Most of the documentation available, and implementations of, NSS/NSPR
+	 * use the PR_NewTCPSocket() function here, which has the drawback that it
+	 * can only create IPv4 sockets. Instead use PR_OpenTCPSocket() which
+	 * copes with IPv6 as well.
+	 */
+	model = SSL_ImportFD(NULL, PR_OpenTCPSocket(conn->laddr.addr.ss_family));
+	if (!model)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to enable TLS: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/* Disable old protocol versions (SSLv2 and SSLv3) */
+	SSL_OptionSet(model, SSL_ENABLE_SSL2, PR_FALSE);
+	SSL_OptionSet(model, SSL_V2_COMPATIBLE_HELLO, PR_FALSE);
+	SSL_OptionSet(model, SSL_ENABLE_SSL3, PR_FALSE);
+
+#ifdef SSL_CBC_RANDOM_IV
+	/*
+	 * Enable protection against the BEAST attack in case the NSS library has
+	 * support for that. While SSLv3 is disabled, we may still allow TLSv1
+	 * which is affected. The option isn't documented as an SSL option, but as
+	 * an NSS environment variable.
+	 */
+	SSL_OptionSet(model, SSL_CBC_RANDOM_IV, PR_TRUE);
+#endif
+
+	/* Set us up as a TLS client for the handshake */
+	SSL_OptionSet(model, SSL_HANDSHAKE_AS_CLIENT, PR_TRUE);
+
+	/*
+	 * When setting the available protocols, we either use the user defined
+	 * configuration values, and if missing we accept whatever is the highest
+	 * version supported by the library as the max and only limit the range in
+	 * the other end at TLSv1.0. ssl_variant_stream is a ProtocolVariant enum
+	 * for Stream protocols, rather than datagram.
+	 */
+	SSL_VersionRangeGetSupported(ssl_variant_stream, &desired_range);
+	desired_range.min = SSL_LIBRARY_VERSION_TLS_1_0;
+
+	if (conn->ssl_min_protocol_version && strlen(conn->ssl_min_protocol_version) > 0)
+	{
+		int			ssl_min_ver = ssl_protocol_version_to_nss(conn->ssl_min_protocol_version);
+
+		if (ssl_min_ver == -1)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("invalid value \"%s\" for minimum version of SSL protocol\n"),
+							  conn->ssl_min_protocol_version);
+			return -1;
+		}
+
+		desired_range.min = ssl_min_ver;
+	}
+
+	if (conn->ssl_max_protocol_version && strlen(conn->ssl_max_protocol_version) > 0)
+	{
+		int			ssl_max_ver = ssl_protocol_version_to_nss(conn->ssl_max_protocol_version);
+
+		if (ssl_max_ver == -1)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("invalid value \"%s\" for maximum version of SSL protocol\n"),
+							  conn->ssl_max_protocol_version);
+			return -1;
+		}
+
+		desired_range.max = ssl_max_ver;
+	}
+
+	if (SSL_VersionRangeSet(model, &desired_range) != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to set allowed SSL protocol version range: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * Set up callback for verifying server certificates, as well as for how
+	 * to handle failed verifications.
+	 */
+	SSL_AuthCertificateHook(model, pg_cert_auth_handler, (void *) conn);
+	SSL_BadCertHook(model, pg_bad_cert_handler, (void *) conn);
+
+	/*
+	 * Convert the NSPR socket to an SSL socket. Ensuring the success of this
+	 * operation is critical as NSS SSL_* functions may return SECSuccess on
+	 * the socket even though SSL hasn't been enabled, which introduce a risk
+	 * of silent downgrades.
+	 */
+	conn->pr_fd = SSL_ImportFD(model, pr_fd);
+	if (!conn->pr_fd)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to configure client for TLS: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * The model can now we closed as we've applied the settings of the model
+	 * onto the real socket. From hereon we should only use conn->pr_fd.
+	 */
+	PR_Close(model);
+
+	/* Set the private data to be passed to the password callback */
+	SSL_SetPKCS11PinArg(conn->pr_fd, (void *) conn);
+
+	/*
+	 * If a CRL file has been specified, verify if it exists in the database
+	 * but don't fail in case it doesn't.
+	 */
+	if (conn->sslcrl && strlen(conn->sslcrl) > 0)
+	{
+		/* XXX: Implement me.. */
+	}
+
+	status = SSL_ResetHandshake(conn->pr_fd, PR_FALSE);
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to initiate handshake: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * Set callback for client authentication when requested by the server.
+	 */
+	SSL_GetClientAuthDataHook(conn->pr_fd, pg_client_auth_handler, (void *) conn);
+
+	/*
+	 * Specify which hostname we are expecting to talk to. This is required,
+	 * albeit mostly applies to when opening a connection to a traditional
+	 * http server it seems.
+	 */
+	SSL_SetURL(conn->pr_fd, (conn->connhost[conn->whichhost]).host);
+
+	do
+	{
+		status = SSL_ForceHandshake(conn->pr_fd);
+	}
+	while (status != SECSuccess && PR_GetError() == PR_WOULD_BLOCK_ERROR);
+
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("SSL error: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	conn->ssl_in_use = true;
+	return PGRES_POLLING_OK;
+}
+
+ssize_t
+pgtls_read(PGconn *conn, void *ptr, size_t len)
+{
+	PRInt32		nread;
+	PRErrorCode status;
+	int			read_errno = 0;
+
+	/*
+	 * PR_Recv blocks until there is data to read or the timeout expires. We
+	 * don't want to sit blocked here, so the timeout is turned off by using
+	 * PR_INTERVAL_NO_WAIT which means "return immediately",  Zero is returned
+	 * for closed connections, while -1 indicates an error within the ongoing
+	 * connection.
+	 */
+	nread = PR_Recv(conn->pr_fd, ptr, len, 0, PR_INTERVAL_NO_WAIT);
+
+	if (nread == 0)
+	{
+		read_errno = ECONNRESET;
+		return -1;
+	}
+
+	if (nread == -1)
+	{
+		status = PR_GetError();
+
+		switch (status)
+		{
+			case PR_WOULD_BLOCK_ERROR:
+				read_errno = EWOULDBLOCK;
+				break;
+
+				/*
+				 * The error cases for PR_Recv are not documented, but can be
+				 * reverse engineered from _MD_unix_map_default_error() in the
+				 * NSPR code, defined in pr/src/md/unix/unix_errors.c.
+				 */
+			case PR_NETWORK_UNREACHABLE_ERROR:
+			case PR_CONNECT_RESET_ERROR:
+				read_errno = ECONNRESET;
+				break;
+
+			default:
+				break;
+		}
+
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("TLS read error: %s"),
+						  pg_SSLerrmessage(status));
+	}
+
+	SOCK_ERRNO_SET(read_errno);
+	return (ssize_t) nread;
+}
+
+/*
+ * pgtls_read_pending
+ *		Check for the existence of data to be read.
+ *
+ * This is part of the PostgreSQL TLS backend API.
+ */
+bool
+pgtls_read_pending(PGconn *conn)
+{
+	unsigned char c;
+	int			n;
+
+	/*
+	 * PR_Recv peeks into the stream with the timeount turned off, to see if
+	 * there is another byte to read off the wire. There is an NSS function
+	 * SSL_DataPending() which might seem like a better fit, but it will only
+	 * check already encrypted data in the SSL buffer, not still unencrypted
+	 * data, thus it doesn't guarantee that a subsequent call to
+	 * PR_Read/PR_Recv wont block.
+	 */
+	n = PR_Recv(conn->pr_fd, &c, 1, PR_MSG_PEEK, PR_INTERVAL_NO_WAIT);
+	return (n > 0);
+}
+
+ssize_t
+pgtls_write(PGconn *conn, const void *ptr, size_t len)
+{
+	PRInt32		n;
+	PRErrorCode status;
+	int			write_errno = 0;
+
+	n = PR_Write(conn->pr_fd, ptr, len);
+
+	if (n < 0)
+	{
+		status = PR_GetError();
+
+		switch (status)
+		{
+			case PR_WOULD_BLOCK_ERROR:
+#ifdef EAGAIN
+				write_errno = EAGAIN;
+#else
+				write_errno = EINTR;
+#endif
+				break;
+
+			default:
+				printfPQExpBuffer(&conn->errorMessage,
+								  libpq_gettext("TLS write error: %s"),
+								  pg_SSLerrmessage(status));
+				write_errno = ECONNRESET;
+				break;
+		}
+	}
+
+	SOCK_ERRNO_SET(write_errno);
+	return (ssize_t) n;
+}
+
+char *
+pgtls_get_peer_certificate_hash(PGconn *conn, size_t *len)
+{
+	CERTCertificate	*server_cert;
+	SECOidTag		signature_alg;
+	SECOidTag		digest_alg;
+	int				digest_len;
+	PLArenaPool	   *arena;
+	SECItem			digest;
+	char		   *ret;
+	SECStatus		status;
+
+	*len = 0;
+
+	server_cert = SSL_PeerCertificate(conn->pr_fd);
+	if (!server_cert)
+		return NULL;
+
+	signature_alg = SECOID_GetAlgorithmTag(&server_cert->signature);
+	digest_alg = SEC_OID_SHA256;
+	digest_len = SHA256_LENGTH;
+
+	while (NSS_SCRAMDigestAlgorithm->signature)
+	{
+		if (signature_alg == NSS_SCRAMDigestAlgorithm->signature)
+		{
+			digest_alg = NSS_SCRAMDigestAlgorithm->hash;
+			digest_len = NSS_SCRAMDigestAlgorithm->len;
+			break;
+		}
+	}
+
+	arena = PORT_NewArena(SEC_ASN1_DEFAULT_ARENA_SIZE);
+	digest.data = PORT_ArenaZAlloc(arena, sizeof(unsigned char) * digest_len);
+	digest.len = digest_len;
+
+	status = PK11_HashBuf(digest_alg, digest.data, server_cert->derCert.data,
+						  server_cert->derCert.len);
+
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to generate peer certificate digest: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		PORT_FreeArena(arena, PR_TRUE);
+		return NULL;
+	}
+
+	ret = pg_strdup((char *) digest.data);
+	*len = digest_len;
+	PORT_FreeArena(arena, PR_TRUE);
+
+	return ret;
+}
+
+/*
+ *	Verify that the server certificate matches the hostname we connected to.
+ *
+ * The certificate's Common Name and Subject Alternative Names are considered.
+ */
+int
+pgtls_verify_peer_name_matches_certificate_guts(PGconn *conn,
+												int *names_examined,
+												char **first_name)
+{
+	char		   *server_hostname = NULL;
+	CERTCertificate *server_cert = NULL;
+	SECStatus status = SECSuccess;
+	SECItem			altname_item;
+	PLArenaPool	   *arena = NULL;
+	CERTGeneralName *san_list;
+	CERTGeneralName *cn;
+
+	server_hostname = SSL_RevealURL(conn->pr_fd);
+	if (!server_hostname || server_hostname[0] == '\0')
+		goto done;
+
+	/*
+	 * CERT_VerifyCertName will internally perform RFC 2818 SubjectAltName
+	 * verification.
+	 */
+	server_cert = SSL_PeerCertificate(conn->pr_fd);
+	status = CERT_VerifyCertName(server_cert, server_hostname);
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to verify server hostname: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		goto done;
+	}
+
+	status = CERT_FindCertExtension(server_cert, SEC_OID_X509_SUBJECT_ALT_NAME,
+									&altname_item);
+	if (status == SECSuccess)
+	{
+		arena = PORT_NewArena(DER_DEFAULT_CHUNKSIZE);
+		if (!arena)
+		{
+			status = SECFailure;
+			goto done;
+		}
+		san_list = CERT_DecodeAltNameExtension(arena, &altname_item);
+		if (!san_list)
+		{
+			status = SECFailure;
+			goto done;
+		}
+
+		for (cn = san_list; cn != san_list; cn = CERT_GetNextGeneralName(cn))
+		{
+			char	   *alt_name;
+			int			rv;
+			char		tmp[512];
+
+			status = CERT_RFC1485_EscapeAndQuote(tmp, sizeof(tmp),
+												 (char *) cn->name.other.data,
+												 cn->name.other.len);
+
+			if (status != SECSuccess)
+				goto done;
+
+			rv = pq_verify_peer_name_matches_certificate_name(conn, tmp,
+															  strlen(tmp),
+															  &alt_name);
+			if (alt_name)
+			{
+				if (!*first_name)
+					*first_name = alt_name;
+				else
+					free(alt_name);
+			}
+
+			if (rv == 1)
+				status = SECSuccess;
+			else
+			{
+				status = SECFailure;
+				break;
+			}
+		}
+	}
+	else if (PORT_GetError() == SEC_ERROR_EXTENSION_NOT_FOUND)
+		status = SECSuccess;
+	else
+		status = SECSuccess;
+
+done:
+	/* san_list will be freed by freeing the arena it was allocated in */
+	if (arena)
+		PORT_FreeArena(arena, PR_TRUE);
+	PR_Free(server_hostname);
+
+	if (status == SECSuccess)
+		return 1;
+
+	return 0;
+}
+
+/* ------------------------------------------------------------ */
+/*			PostgreSQL specific TLS support functions			*/
+/* ------------------------------------------------------------ */
+
+static const char *
+pg_SSLerrmessage(PRErrorCode errcode)
+{
+	const char *error;
+
+	error = PR_ErrorToName(errcode);
+	if (error)
+		return error;
+
+	return "unknown TLS error";
+}
+
+static SECStatus
+pg_load_nss_module(SECMODModule * *module, const char *library, const char *name)
+{
+	SECMODModule *mod;
+	char	   *modulespec;
+
+	modulespec = psprintf("library=\"%s\", name=\"%s\"", library, name);
+
+	/*
+	 * Attempt to load the specified module. The second parameter is "parent"
+	 * which should always be NULL for application code. The third parameter
+	 * defines if loading should recurse which is only applicable when loading
+	 * a module from within another module. This hierarchy would have to be
+	 * defined in the modulespec, and since we don't support anything but
+	 * directly addressed modules we should pass PR_FALSE.
+	 */
+	mod = SECMOD_LoadUserModule(modulespec, NULL, PR_FALSE);
+	pfree(modulespec);
+
+	if (mod && mod->loaded)
+	{
+		*module = mod;
+		return SECSuccess;
+	}
+
+	SECMOD_DestroyModule(mod);
+	return SECFailure;
+}
+
+/* ------------------------------------------------------------ */
+/*						NSS Callbacks							*/
+/* ------------------------------------------------------------ */
+
+/*
+ * pg_cert_auth_handler
+ *			Callback for authenticating server certificate
+ *
+ * This is pretty much the same procedure as the SSL_AuthCertificate function
+ * provided by NSS, with the difference being server hostname validation. With
+ * SSL_AuthCertificate there is no way to do verify-ca, it only does the -full
+ * flavor of our sslmodes, so we need our own implementation.
+ */
+static SECStatus
+pg_cert_auth_handler(void *arg, PRFileDesc *fd, PRBool checksig, PRBool isServer)
+{
+	SECStatus	status;
+	PGconn	   *conn = (PGconn *) arg;
+	CERTCertificate *server_cert;
+	void	   *pin;
+
+	Assert(!isServer);
+
+	pin = SSL_RevealPinArg(conn->pr_fd);
+	server_cert = SSL_PeerCertificate(conn->pr_fd);
+
+	status = CERT_VerifyCertificateNow((CERTCertDBHandle *) CERT_GetDefaultCertDB(),
+									   server_cert,
+									   checksig,
+									   certificateUsageSSLServer,
+									   pin,
+									   NULL);
+
+	/*
+	 * If we've already failed validation then there is no point in also
+	 * performing the hostname check for verify-full.
+	 */
+	if (status == SECSuccess)
+	{
+		if (!pq_verify_peer_name_matches_certificate(conn))
+			status = SECFailure;
+	}
+	else
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to verify certificate: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+	}
+
+	return status;
+}
+
+/*
+ * pg_client_auth_handler
+ *		Callback for client certificate validation
+ *
+ * The client auth callback is not on by default in NSS, so we need to invoke
+ * it ourselves to ensure we can do cert authentication. A TODO is to support
+ * running without a specified sslcert parameter. By retrieving all the certs
+ * via nickname from the cert database and see if we find one which apply with
+ * NSS_CmpCertChainWCANames() and PK11_FindKeyByAnyCert() we could support
+ * just running with a ssl database specified.
+ *
+ * For now, we use the default client certificate validation which requires a
+ * defined nickname to identify the cert in the database.
+ */
+static SECStatus
+pg_client_auth_handler(void *arg, PRFileDesc * socket, CERTDistNames * caNames,
+					   CERTCertificate * *pRetCert, SECKEYPrivateKey * *pRetKey)
+{
+	PGconn	   *conn = (PGconn *) arg;
+
+	return NSS_GetClientAuthData(conn->sslcert, socket, caNames, pRetCert, pRetKey);
+}
+
+/*
+ * pg_bad_cert_handler
+ *		Callback for failed certificate validation
+ *
+ * The TLS handshake will call this function iff the server certificate failed
+ * validation. Depending on the sslmode, we allow the connection anyways.
+ */
+static SECStatus
+pg_bad_cert_handler(void *arg, PRFileDesc * fd)
+{
+	PGconn	   *conn = (PGconn *) arg;
+	PRErrorCode err;
+
+	/*
+	 * This really shouldn't happen, as we've the the PGconn object as our
+	 * callback data, and at the callsite we know it will be populated. That
+	 * being said, the NSS code itself performs this check even when it should
+	 * not be required so let's use the same belts with our suspenders.
+	 */
+	if (!arg)
+		return SECFailure;
+
+	/*
+	 * For sslmodes other than verify-full and verify-ca we don't perform peer
+	 * validation, so return immediately.  sslmode require with a database
+	 * specified which contains a CA certificate will work like verify-ca to
+	 * be compatible with the OpenSSL implementation.
+	 */
+	if (strcmp(conn->sslmode, "require") == 0)
+	{
+		if (conn->cert_database && strlen(conn->cert_database) > 0 && cert_database_has_CA(conn))
+			return SECFailure;
+	}
+	if (conn->sslmode[0] == 'v')
+		return SECFailure;
+
+	err = PORT_GetError();
+
+	/*
+	 * TODO: these are relevant error codes that can occur in certificate
+	 * validation, figure out which we dont want for require/prefer etc.
+	 */
+	switch (err)
+	{
+		case SEC_ERROR_INVALID_AVA:
+		case SEC_ERROR_INVALID_TIME:
+		case SEC_ERROR_BAD_SIGNATURE:
+		case SEC_ERROR_EXPIRED_CERTIFICATE:
+		case SEC_ERROR_UNKNOWN_ISSUER:
+		case SEC_ERROR_UNTRUSTED_ISSUER:
+		case SEC_ERROR_UNTRUSTED_CERT:
+		case SEC_ERROR_CERT_VALID:
+		case SEC_ERROR_EXPIRED_ISSUER_CERTIFICATE:
+		case SEC_ERROR_CRL_EXPIRED:
+		case SEC_ERROR_CRL_BAD_SIGNATURE:
+		case SEC_ERROR_EXTENSION_VALUE_INVALID:
+		case SEC_ERROR_CA_CERT_INVALID:
+		case SEC_ERROR_CERT_USAGES_INVALID:
+		case SEC_ERROR_UNKNOWN_CRITICAL_EXTENSION:
+			return SECSuccess;
+			break;
+		default:
+			return SECFailure;
+			break;
+	}
+
+	/* Unreachable */
+	return SECSuccess;
+}
+
+/* ------------------------------------------------------------ */
+/*					SSL information functions					*/
+/* ------------------------------------------------------------ */
+
+/*
+ * PQgetssl
+ *
+ * Return NULL as this is legacy and defined to always be equal to calling
+ * PQsslStruct(conn, "OpenSSL"); This should ideally trigger a logged warning
+ * somewhere as it's nonsensical to run in a non-OpenSSL build, but the color
+ * of said bikeshed hasn't yet been determined.
+ */
+void *
+PQgetssl(PGconn *conn)
+{
+	return NULL;
+}
+
+void *
+PQsslStruct(PGconn *conn, const char *struct_name)
+{
+	if (!conn)
+		return NULL;
+
+	/*
+	 * Return the underlying PRFileDesc which can be used to access
+	 * information on the connection details. There is no SSL context per se.
+	 */
+	if (strcmp(struct_name, "NSS") == 0)
+		return conn->pr_fd;
+	return NULL;
+}
+
+const char *const *
+PQsslAttributeNames(PGconn *conn)
+{
+	static const char *const result[] = {
+		"library",
+		"cipher",
+		"protocol",
+		"key_bits",
+		"compression",
+		NULL
+	};
+
+	return result;
+}
+
+const char *
+PQsslAttribute(PGconn *conn, const char *attribute_name)
+{
+	SECStatus	status;
+	SSLChannelInfo channel;
+	SSLCipherSuiteInfo suite;
+
+	if (!conn || !conn->pr_fd)
+		return NULL;
+
+	if (strcmp(attribute_name, "library") == 0)
+		return "NSS";
+
+	status = SSL_GetChannelInfo(conn->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+		return NULL;
+
+	status = SSL_GetCipherSuiteInfo(channel.cipherSuite, &suite, sizeof(suite));
+	if (status != SECSuccess)
+		return NULL;
+
+	if (strcmp(attribute_name, "cipher") == 0)
+		return suite.cipherSuiteName;
+
+	if (strcmp(attribute_name, "key_bits") == 0)
+	{
+		static char key_bits_str[8];
+
+		snprintf(key_bits_str, sizeof(key_bits_str), "%i", suite.effectiveKeyBits);
+		return key_bits_str;
+	}
+
+	if (strcmp(attribute_name, "protocol") == 0)
+	{
+		switch (channel.protocolVersion)
+		{
+#ifdef SSL_LIBRARY_VERSION_TLS_1_3
+			case SSL_LIBRARY_VERSION_TLS_1_3:
+				return "TLSv1.3";
+#endif
+#ifdef SSL_LIBRARY_VERSION_TLS_1_2
+			case SSL_LIBRARY_VERSION_TLS_1_2:
+				return "TLSv1.2";
+#endif
+#ifdef SSL_LIBRARY_VERSION_TLS_1_1
+			case SSL_LIBRARY_VERSION_TLS_1_1:
+				return "TLSv1.1";
+#endif
+			case SSL_LIBRARY_VERSION_TLS_1_0:
+				return "TLSv1.0";
+			default:
+				return "unknown";
+		}
+	}
+
+	/*
+	 * NSS disabled support for compression in version 3.33, and it was only
+	 * available for SSLv3 at that point anyways, so we can safely return off
+	 * here without checking.
+	 */
+	if (strcmp(attribute_name, "compression") == 0)
+		return "off";
+
+	return NULL;
+}
+
+static int
+ssl_protocol_version_to_nss(const char *protocol)
+{
+	if (pg_strcasecmp("TLSv1", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_0;
+
+#ifdef SSL_LIBRARY_VERSION_TLS_1_1
+	if (pg_strcasecmp("TLSv1.1", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_1;
+#endif
+
+#ifdef SSL_LIBRARY_VERSION_TLS_1_2
+	if (pg_strcasecmp("TLSv1.2", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_2;
+#endif
+
+#ifdef SSL_LIBRARY_VERSION_TLS_1_3
+	if (pg_strcasecmp("TLSv1.3", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_3;
+#endif
+
+	return -1;
+}
+
+static bool
+cert_database_has_CA(PGconn *conn)
+{
+	CERTCertList *certificates;
+	bool		hasCA;
+
+	/*
+	 * If the certificate database has a password we must provide it, since
+	 * this API doesn't invoke the standard password callback.
+	 */
+	if (conn->has_password)
+		certificates = PK11_ListCerts(PK11CertListCA, PQssl_passwd_cb(NULL, PR_FALSE, (void *) conn));
+	else
+		certificates = PK11_ListCerts(PK11CertListCA, NULL);
+	hasCA = !CERT_LIST_EMPTY(certificates);
+	CERT_DestroyCertList(certificates);
+
+	return hasCA;
+}
+
+PQsslKeyPassHook_nss_type
+PQgetSSLKeyPassHook_nss(void)
+{
+	return PQsslKeyPassHook;
+}
+
+void
+PQsetSSLKeyPassHook_nss(PQsslKeyPassHook_nss_type hook)
+{
+	PQsslKeyPassHook = hook;
+}
+
+/*
+ * Supply a password to decrypt a client certificate.
+ *
+ * This must match NSS type PK11PasswordFunc.
+ */
+static char *
+PQssl_passwd_cb(PK11SlotInfo * slot, PRBool retry, void *arg)
+{
+	PGconn	   *conn = (PGconn *) arg;
+
+	conn->has_password = true;
+
+	if (PQsslKeyPassHook)
+		return PQsslKeyPassHook(slot, (PRBool) retry, arg);
+	else
+		return PQdefaultSSLKeyPassHook_nss(slot, retry, arg);
+}
+
+/*
+ * The default password handler callback.
+ */
+char *
+PQdefaultSSLKeyPassHook_nss(PK11SlotInfo * slot, PRBool retry, void *arg)
+{
+	PGconn	   *conn = (PGconn *) arg;
+
+	/*
+	 * If the password didn't work the first time there is no point in
+	 * retrying as it hasn't changed.
+	 */
+	if (retry != PR_TRUE && conn->sslpassword && strlen(conn->sslpassword) > 0)
+		return PORT_Strdup(conn->sslpassword);
+
+	return NULL;
+}
diff --git a/src/interfaces/libpq/fe-secure.c b/src/interfaces/libpq/fe-secure.c
index 97c3805303..dd6ee15c5a 100644
--- a/src/interfaces/libpq/fe-secure.c
+++ b/src/interfaces/libpq/fe-secure.c
@@ -427,6 +427,9 @@ PQsslAttributeNames(PGconn *conn)
 
 	return result;
 }
+#endif /* USE_SSL */
+
+#ifndef USE_OPENSSL
 
 PQsslKeyPassHook_OpenSSL_type
 PQgetSSLKeyPassHook_OpenSSL(void)
@@ -445,7 +448,7 @@ PQdefaultSSLKeyPassHook_OpenSSL(char *buf, int size, PGconn *conn)
 {
 	return 0;
 }
-#endif							/* USE_SSL */
+#endif							/* USE_OPENSSL */
 
 /* Dummy version of GSSAPI information functions, when built without GSS support */
 #ifndef ENABLE_GSS
diff --git a/src/interfaces/libpq/libpq-fe.h b/src/interfaces/libpq/libpq-fe.h
index 3b6a9fbce3..27c16e187f 100644
--- a/src/interfaces/libpq/libpq-fe.h
+++ b/src/interfaces/libpq/libpq-fe.h
@@ -625,6 +625,17 @@ extern PQsslKeyPassHook_OpenSSL_type PQgetSSLKeyPassHook_OpenSSL(void);
 extern void PQsetSSLKeyPassHook_OpenSSL(PQsslKeyPassHook_OpenSSL_type hook);
 extern int	PQdefaultSSLKeyPassHook_OpenSSL(char *buf, int size, PGconn *conn);
 
+/* == in fe-secure-nss.c === */
+typedef struct PK11SlotInfoStr PK11SlotInfo;
+typedef int PRIntn;
+typedef PRIntn PRBool;
+
+/* Support for overriding sslpassword handling with a callback. */
+typedef char *(*PQsslKeyPassHook_nss_type) (PK11SlotInfo * slot, PRBool retry, void *arg);
+extern PQsslKeyPassHook_nss_type PQgetSSLKeyPassHook_nss(void);
+extern void PQsetSSLKeyPassHook_nss(PQsslKeyPassHook_nss_type hook);
+extern char *PQdefaultSSLKeyPassHook_nss(PK11SlotInfo * slot, PRBool retry, void *arg);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/src/interfaces/libpq/libpq-int.h b/src/interfaces/libpq/libpq-int.h
index 1de91ae295..5d9326490a 100644
--- a/src/interfaces/libpq/libpq-int.h
+++ b/src/interfaces/libpq/libpq-int.h
@@ -362,6 +362,7 @@ struct pg_conn
 	char	   *sslpassword;	/* client key file password */
 	char	   *sslrootcert;	/* root certificate filename */
 	char	   *sslcrl;			/* certificate revocation list filename */
+	char	   *cert_database;	/* NSS certificate/key database */
 	char	   *requirepeer;	/* required peer credentials for local sockets */
 	char	   *gssencmode;		/* GSS mode (require,prefer,disable) */
 	char	   *krbsrvname;		/* Kerberos service name */
@@ -485,6 +486,21 @@ struct pg_conn
 								 * OpenSSL version changes */
 #endif
 #endif							/* USE_OPENSSL */
+
+#ifdef USE_NSS
+	void	   *pr_fd;			/* NSPR file descriptor for the connection */
+	/*
+	 * Track whether the NSS database has a password set or not. There is no
+	 * API function for retrieving password status of a database, but we need
+	 * to know since some NSS API calls require the password passed in (they
+	 * don't call the callback themselves). To track, we simply flip this to
+	 * true in case NSS invoked the password callback - as that will only
+	 * happen in case there is a password. The reason for tracking this is that
+	 * there are calls which require a password parameter, but doesn't use the
+	 * callbacks provided, so we must call the callback on behalf of these.
+	 */
+	bool		has_password;
+#endif							/* USE_NSS */
 #endif							/* USE_SSL */
 
 #ifdef ENABLE_GSS
@@ -755,7 +771,7 @@ extern ssize_t pgtls_write(PGconn *conn, const void *ptr, size_t len);
  * This is not supported with old versions of OpenSSL that don't have
  * the X509_get_signature_nid() function.
  */
-#if defined(USE_OPENSSL) && defined(HAVE_X509_GET_SIGNATURE_NID)
+#if defined(USE_NSS) || (defined(USE_OPENSSL) && defined(HAVE_X509_GET_SIGNATURE_NID))
 #define HAVE_PGTLS_GET_PEER_CERTIFICATE_HASH
 extern char *pgtls_get_peer_certificate_hash(PGconn *conn, size_t *len);
 #endif
diff --git a/src/tools/msvc/Mkvcbuild.pm b/src/tools/msvc/Mkvcbuild.pm
index 90594bd41b..29879b51af 100644
--- a/src/tools/msvc/Mkvcbuild.pm
+++ b/src/tools/msvc/Mkvcbuild.pm
@@ -192,12 +192,19 @@ sub mkvcbuild
 	$postgres->FullExportDLL('postgres.lib');
 
 	# The OBJS scraper doesn't know about ifdefs, so remove appropriate files
-	# if building without OpenSSL.
-	if (!$solution->{options}->{openssl})
+	# if building without various options.
+	if (!$solution->{options}->{openssl} && !$solution->{options}->{nss})
 	{
 		$postgres->RemoveFile('src/backend/libpq/be-secure-common.c');
+	}
+	if (!$solution->{options}->{openssl})
+	{
 		$postgres->RemoveFile('src/backend/libpq/be-secure-openssl.c');
 	}
+	if (!$solution->{options}->{nss})
+	{
+		$postgres->RemoveFile('src/backend/libpq/be-secure-nss.c');
+	}
 	if (!$solution->{options}->{gss})
 	{
 		$postgres->RemoveFile('src/backend/libpq/be-gssapi-common.c');
@@ -255,12 +262,19 @@ sub mkvcbuild
 	$libpq->AddReference($libpgcommon, $libpgport);
 
 	# The OBJS scraper doesn't know about ifdefs, so remove appropriate files
-	# if building without OpenSSL.
-	if (!$solution->{options}->{openssl})
+	# if building without various options
+	if (!$solution->{options}->{openssl} && !$solution->{options}->{nss})
 	{
 		$libpq->RemoveFile('src/interfaces/libpq/fe-secure-common.c');
+	}
+	if (!$solution->{options}->{openssl})
+	{
 		$libpq->RemoveFile('src/interfaces/libpq/fe-secure-openssl.c');
 	}
+	if (!$solution->{options}->{nss})
+	{
+		$libpq->RemoveFile('src/interfaces/libpq/fe-secure-nss.c');
+	}
 	if (!$solution->{options}->{gss})
 	{
 		$libpq->RemoveFile('src/interfaces/libpq/fe-gssapi-common.c');
diff --git a/src/tools/msvc/Solution.pm b/src/tools/msvc/Solution.pm
index bc8904732f..ac11d9ab26 100644
--- a/src/tools/msvc/Solution.pm
+++ b/src/tools/msvc/Solution.pm
@@ -484,6 +484,7 @@ sub GenerateFiles
 		USE_NAMED_POSIX_SEMAPHORES => undef,
 		USE_OPENSSL                => undef,
 		USE_OPENSSL_RANDOM         => undef,
+		USE_NSS                    => undef,
 		USE_PAM                    => undef,
 		USE_SLICING_BY_8_CRC32C    => undef,
 		USE_SSE42_CRC32C           => undef,
@@ -537,6 +538,10 @@ sub GenerateFiles
 			$define{HAVE_OPENSSL_INIT_SSL}      = 1;
 		}
 	}
+	if ($self->{options}->{nss})
+	{
+		$define{USE_NSS} = 1;
+	}
 
 	$self->GenerateConfigHeader('src/include/pg_config.h',     \%define, 1);
 	$self->GenerateConfigHeader('src/include/pg_config_ext.h', \%define, 0);
@@ -1004,6 +1009,21 @@ sub AddProject
 			}
 		}
 	}
+	if ($self->{options}->{nss})
+	{
+		$proj->AddIncludeDir($self->{options}->{nss} . '\..\public\nss');
+		$proj->AddIncludeDir($self->{options}->{nss} . '\include\nspr');
+		foreach my $lib (qw(plds4 plc4 nspr4))
+		{
+			$proj->AddLibrary($self->{options}->{nss} .
+							  '\lib\lib' . "$lib.lib", 0);
+		}
+		foreach my $lib (qw(ssl3 smime3 nss3))
+		{
+			$proj->AddLibrary($self->{options}->{nss} .
+							  '\lib' . "\\$lib.dll.lib", 0);
+		}
+	}
 	if ($self->{options}->{nls})
 	{
 		$proj->AddIncludeDir($self->{options}->{nls} . '\include');
diff --git a/src/tools/msvc/config_default.pl b/src/tools/msvc/config_default.pl
index 2ef2cfc4e9..49dc4d5864 100644
--- a/src/tools/msvc/config_default.pl
+++ b/src/tools/msvc/config_default.pl
@@ -17,6 +17,7 @@ our $config = {
 	perl      => undef,    # --with-perl=<path>
 	python    => undef,    # --with-python=<path>
 	openssl   => undef,    # --with-openssl=<path>
+	nss       => undef,    # --with-nss=<path>
 	uuid      => undef,    # --with-uuid=<path>
 	xml       => undef,    # --with-libxml=<path>
 	xslt      => undef,    # --with-libxslt=<path>
-- 
2.21.1 (Apple Git-122.3)

From 7e7a6356eb05ac03256d8f8cb5e93607e1bcd1e3 Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Wed, 28 Oct 2020 11:22:26 +0100
Subject: [PATCH v17 2/5] NSS Testharness updates

TODO:
	* Generate certificate/keys with NSS tooling for NSS specific test
	* Add test for certificate with embedded nulls
	* Fix SCRAM tests when channel binding works
---
 src/test/Makefile                             |   2 +-
 src/test/modules/Makefile                     |   2 +-
 .../modules/ssl_passphrase_callback/Makefile  |   2 +-
 .../ssl_passphrase_callback/t/001_testfunc.pl |   4 +-
 src/test/ssl/Makefile                         | 177 +++++++++-
 src/test/ssl/t/001_ssltests.pl                | 328 ++++++++++--------
 src/test/ssl/t/002_scram.pl                   |   8 +-
 src/test/ssl/t/SSL/Backend/NSS.pm             |  64 ++++
 src/test/ssl/t/SSL/Backend/OpenSSL.pm         | 103 ++++++
 .../ssl/t/{SSLServer.pm => SSL/Server.pm}     |  80 ++++-
 10 files changed, 611 insertions(+), 159 deletions(-)
 create mode 100644 src/test/ssl/t/SSL/Backend/NSS.pm
 create mode 100644 src/test/ssl/t/SSL/Backend/OpenSSL.pm
 rename src/test/ssl/t/{SSLServer.pm => SSL/Server.pm} (78%)

diff --git a/src/test/Makefile b/src/test/Makefile
index 14cde4f5ba..1b6876ca18 100644
--- a/src/test/Makefile
+++ b/src/test/Makefile
@@ -28,7 +28,7 @@ ifneq (,$(filter ldap,$(PG_TEST_EXTRA)))
 SUBDIRS += ldap
 endif
 endif
-ifeq ($(with_openssl),yes)
+ifeq ($(with_ssl),yes)
 ifneq (,$(filter ssl,$(PG_TEST_EXTRA)))
 SUBDIRS += ssl
 endif
diff --git a/src/test/modules/Makefile b/src/test/modules/Makefile
index a6d2ffbf9e..6e6ca97d95 100644
--- a/src/test/modules/Makefile
+++ b/src/test/modules/Makefile
@@ -27,7 +27,7 @@ SUBDIRS = \
 		  unsafe_tests \
 		  worker_spi
 
-ifeq ($(with_openssl),yes)
+ifeq ($(with_ssl),openssl)
 SUBDIRS += ssl_passphrase_callback
 else
 ALWAYS_SUBDIRS += ssl_passphrase_callback
diff --git a/src/test/modules/ssl_passphrase_callback/Makefile b/src/test/modules/ssl_passphrase_callback/Makefile
index f81265c296..a34d7ea46a 100644
--- a/src/test/modules/ssl_passphrase_callback/Makefile
+++ b/src/test/modules/ssl_passphrase_callback/Makefile
@@ -1,6 +1,6 @@
 # ssl_passphrase_callback Makefile
 
-export with_openssl
+export with_ssl
 
 MODULE_big = ssl_passphrase_func
 OBJS = ssl_passphrase_func.o $(WIN32RES)
diff --git a/src/test/modules/ssl_passphrase_callback/t/001_testfunc.pl b/src/test/modules/ssl_passphrase_callback/t/001_testfunc.pl
index dbc084f870..a2bed5336c 100644
--- a/src/test/modules/ssl_passphrase_callback/t/001_testfunc.pl
+++ b/src/test/modules/ssl_passphrase_callback/t/001_testfunc.pl
@@ -7,9 +7,9 @@ use TestLib;
 use Test::More;
 use PostgresNode;
 
-unless (($ENV{with_openssl} || 'no') eq 'yes')
+unless ($ENV{with_ssl} eq 'openssl')
 {
-	plan skip_all => 'SSL not supported by this build';
+	plan skip_all => 'OpenSSL not supported by this build';
 }
 
 my $clearpass = "FooBaR1";
diff --git a/src/test/ssl/Makefile b/src/test/ssl/Makefile
index 777ee39413..3e0ac72a06 100644
--- a/src/test/ssl/Makefile
+++ b/src/test/ssl/Makefile
@@ -13,7 +13,7 @@ subdir = src/test/ssl
 top_builddir = ../../..
 include $(top_builddir)/src/Makefile.global
 
-export with_openssl
+export with_ssl
 
 CERTIFICATES := server_ca server-cn-and-alt-names \
 	server-cn-only server-single-alt-name server-multiple-alt-names \
@@ -30,6 +30,32 @@ SSLFILES := $(CERTIFICATES:%=ssl/%.key) $(CERTIFICATES:%=ssl/%.crt) \
 	ssl/client+client_ca.crt ssl/client-der.key \
 	ssl/client-encrypted-pem.key ssl/client-encrypted-der.key
 
+# Even though we in practice could get away with far fewer NSS databases, they
+# are generated to mimick the setup for the OpenSSL tests in order to ensure
+# we isolate the same behavior between the backends. The database name should
+# contain the files included for easier test suite code reading.
+NSSFILES := ssl/nss/client_ca.crt.db \
+	ssl/nss/server_ca.crt.db \
+	ssl/nss/root+server_ca.crt.db \
+	ssl/nss/root+client_ca.crt.db \
+	ssl/nss/client.crt__client.key.db \
+	ssl/nss/client-revoked.crt__client-revoked.key.db \
+	ssl/nss/server-cn-only.crt__server-password.key.db \
+	ssl/nss/server-cn-only.crt__server-cn-only.key.db \
+	ssl/nss/root.crl \
+	ssl/nss/server.crl \
+	ssl/nss/client.crl \
+	ssl/nss/server-multiple-alt-names.crt__server-multiple-alt-names.key.db \
+	ssl/nss/server-single-alt-name.crt__server-single-alt-name.key.db \
+	ssl/nss/server-cn-and-alt-names.crt__server-cn-and-alt-names.key.db \
+	ssl/nss/server-no-names.crt__server-no-names.key.db \
+	ssl/nss/server-revoked.crt__server-revoked.key.db \
+	ssl/nss/root+client.crl \
+	ssl/nss/client+client_ca.crt__client.key.db \
+	ssl/nss/client.crt__client-encrypted-pem.key.db \
+	ssl/nss/root+server_ca.crt__server.crl.db \
+	ssl/nss/root+server_ca.crt__root+server.crl.db
+
 # This target re-generates all the key and certificate files. Usually we just
 # use the ones that are committed to the tree without rebuilding them.
 #
@@ -37,6 +63,10 @@ SSLFILES := $(CERTIFICATES:%=ssl/%.key) $(CERTIFICATES:%=ssl/%.crt) \
 #
 sslfiles: $(SSLFILES)
 
+# Generate NSS certificate databases corresponding to the OpenSSL certificates.
+# This target will fail unless preceded by nssfiles-clean.
+nssfiles: $(NSSFILES)
+
 # OpenSSL requires a directory to put all generated certificates in. We don't
 # use this for anything, but we need a location.
 ssl/new_certs_dir:
@@ -64,6 +94,24 @@ ssl/%_ca.crt: ssl/%_ca.key %_ca.config ssl/root_ca.crt ssl/new_certs_dir
 	rm ssl/temp_ca.crt ssl/temp_ca_signed.crt
 	echo "01" > ssl/$*_ca.srl
 
+ssl/nss/%_ca.crt.db: ssl/%_ca.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n $*_ca.crt -i ssl/$*_ca.crt -t "CT,C,C"
+
+ssl/nss/root+server_ca.crt__server.crl.db: ssl/root+server_ca.crt ssl/nss/server.crl
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	crlutil -I -i ssl/nss/server.crl -d $@ -B
+
+ssl/nss/root+server_ca.crt__root+server.crl.db: ssl/root+server_ca.crt ssl/nss/root.crl ssl/nss/server.crl
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	crlutil -I -i ssl/nss/root.crl -d $@ -B
+	crlutil -I -i ssl/nss/server.crl -d $@ -B
+
 # Server certificates, signed by server CA:
 ssl/server-%.crt: ssl/server-%.key ssl/server_ca.crt server-%.config
 	openssl req -new -key ssl/server-$*.key -out ssl/server-$*.csr -config server-$*.config
@@ -77,6 +125,78 @@ ssl/server-ss.crt: ssl/server-cn-only.key ssl/server-cn-only.crt server-cn-only.
 	openssl x509 -req -days 10000 -in ssl/server-ss.csr -signkey ssl/server-cn-only.key -out ssl/server-ss.crt  -extensions v3_req -extfile server-cn-only.config
 	rm ssl/server-ss.csr
 
+# pk12util won't preserve the password when importing the password protected
+# key, the password must be set on the database *before* importing it as the
+# password in the pkcs12 envelope will be dropped.
+ssl/nss/server-cn-only.crt__server-password.key.db: ssl/server-cn-only.crt
+	$(MKDIR_P) $@
+	echo "secret1" > password.txt
+	certutil -d "sql:$@" -N -f password.txt
+	certutil -d "sql:$@" -A -n ssl/server-cn-only.crt -i ssl/server-cn-only.crt -t "CT,C,C" -f password.txt
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C" -f password.txt
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C" -f password.txt
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C" -f password.txt
+	openssl pkcs12 -export -out ssl/nss/server-password.pfx -inkey ssl/server-password.key -in ssl/server-cn-only.crt -certfile ssl/server_ca.crt -passin 'pass:secret1' -passout 'pass:secret1'
+	pk12util -i ssl/nss/server-password.pfx -d "sql:$@" -W 'secret1' -K 'secret1'
+
+ssl/nss/server-cn-only.crt__server-cn-only.key.db: ssl/server-cn-only.crt ssl/server-cn-only.key
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-cn-only.crt -i ssl/server-cn-only.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-cn-only.pfx -inkey ssl/server-cn-only.key -in ssl/server-cn-only.crt -certfile ssl/server_ca.crt -passout pass:
+	pk12util -i ssl/nss/server-cn-only.pfx -d "sql:$@" -W ''
+
+ssl/nss/server-multiple-alt-names.crt__server-multiple-alt-names.key.db: ssl/server-multiple-alt-names.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-multiple-alt-names.crt -i ssl/server-multiple-alt-names.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-multiple-alt-names.pfx -inkey ssl/server-multiple-alt-names.key -in ssl/server-multiple-alt-names.crt -certfile ssl/server-multiple-alt-names.crt -passout pass:
+	pk12util -i ssl/nss/server-multiple-alt-names.pfx -d "sql:$@" -W ''
+
+ssl/nss/server-single-alt-name.crt__server-single-alt-name.key.db: ssl/server-single-alt-name.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-single-alt-name.crt -i ssl/server-single-alt-name.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-single-alt-name.pfx -inkey ssl/server-single-alt-name.key -in ssl/server-single-alt-name.crt -certfile ssl/server-single-alt-name.crt -passout pass:
+	pk12util -i ssl/nss/server-single-alt-name.pfx -d "sql:$@" -W ''
+
+ssl/nss/server-cn-and-alt-names.crt__server-cn-and-alt-names.key.db: ssl/server-cn-and-alt-names.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-cn-and-alt-names.crt -i ssl/server-cn-and-alt-names.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-cn-and-alt-names.pfx -inkey ssl/server-cn-and-alt-names.key -in ssl/server-cn-and-alt-names.crt -certfile ssl/server-cn-and-alt-names.crt -passout pass:
+	pk12util -i ssl/nss/server-cn-and-alt-names.pfx -d $@ -W ''
+
+ssl/nss/server-no-names.crt__server-no-names.key.db: ssl/server-no-names.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-no-names.crt -i ssl/server-no-names.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-no-names.pfx -inkey ssl/server-no-names.key -in ssl/server-no-names.crt -certfile ssl/server-no-names.crt -passout pass:
+	pk12util -i ssl/nss/server-no-names.pfx -d "sql:$@" -W ''
+
+ssl/nss/server-revoked.crt__server-revoked.key.db: ssl/server-revoked.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-revoked.crt -i ssl/server-revoked.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-revoked.pfx -inkey ssl/server-revoked.key -in ssl/server-revoked.crt -certfile ssl/server-revoked.crt -passout pass:
+	pk12util -i ssl/nss/server-revoked.pfx -d "sql:$@" -W ''
+
 # Password-protected version of server-cn-only.key
 ssl/server-password.key: ssl/server-cn-only.key
 	openssl rsa -aes256 -in $< -out $@ -passout 'pass:secret1'
@@ -88,6 +208,27 @@ ssl/client.crt: ssl/client.key ssl/client_ca.crt
 	openssl x509 -in ssl/temp.crt -out ssl/client.crt # to keep just the PEM cert
 	rm ssl/client.csr ssl/temp.crt
 
+# Client certificate, signed by client CA
+ssl/nss/client.crt__client.key.db: ssl/client.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/client.crt -i ssl/client.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root+client_ca.crt -i ssl/root+client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client.pfx -inkey ssl/client.key -in ssl/client.crt -certfile ssl/client_ca.crt -passout pass:
+	pk12util -i ssl/nss/client.pfx -d "sql:$@" -W ''
+
+# Client certificate with encrypted key, signed by client CA
+ssl/nss/client.crt__client-encrypted-pem.key.db: ssl/client.crt
+	$(MKDIR_P) $@
+	echo 'dUmmyP^#+' > $@.pass
+	certutil -d "sql:$@" -N -f $@.pass
+	certutil -d "sql:$@" -A -f $@.pass -n ssl/client.crt -i ssl/client.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -f $@.pass -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -f $@.pass -n root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client-encrypted-pem.pfx -inkey ssl/client-encrypted-pem.key -in ssl/client.crt -certfile ssl/client_ca.crt -passin pass:'dUmmyP^#+' -passout pass:'dUmmyP^#+'
+	pk12util -i ssl/nss/client-encrypted-pem.pfx -d "sql:$@" -W 'dUmmyP^#+' -k $@.pass
+
 # Another client certificate, signed by the client CA. This one is revoked.
 ssl/client-revoked.crt: ssl/client-revoked.key ssl/client_ca.crt client.config
 	openssl req -new -key ssl/client-revoked.key -out ssl/client-revoked.csr -config client.config
@@ -95,6 +236,14 @@ ssl/client-revoked.crt: ssl/client-revoked.key ssl/client_ca.crt client.config
 	openssl x509 -in ssl/temp.crt -out ssl/client-revoked.crt # to keep just the PEM cert
 	rm ssl/client-revoked.csr ssl/temp.crt
 
+ssl/nss/client-revoked.crt__client-revoked.key.db: ssl/client-revoked.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/client-revoked.crt -i ssl/client-revoked.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client-revoked.pfx -inkey ssl/client-revoked.key -in ssl/client-revoked.crt -certfile ssl/client_ca.crt -passout pass:
+	pk12util -i ssl/nss/client-revoked.pfx -d "sql:$@" -W ''
+
 # Convert the key to DER, to test our behaviour there too
 ssl/client-der.key: ssl/client.key
 	openssl rsa -in ssl/client.key -outform DER -out ssl/client-der.key
@@ -127,19 +276,40 @@ ssl/root+client_ca.crt: ssl/root_ca.crt ssl/client_ca.crt
 ssl/client+client_ca.crt: ssl/client.crt ssl/client_ca.crt
 	cat $^ > $@
 
+# Client certificate, signed by client CA
+ssl/nss/client+client_ca.crt__client.key.db: ssl/client+client_ca.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/client+client_ca.crt -i ssl/client+client_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n ssl/root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client.pfx -inkey ssl/client.key -in ssl/client.crt -certfile ssl/client_ca.crt -passout pass:
+	pk12util -i ssl/nss/client.pfx -d "sql:$@" -W ''
+
 #### CRLs
 
 ssl/client.crl: ssl/client-revoked.crt
 	openssl ca -config cas.config -name client_ca -revoke ssl/client-revoked.crt
 	openssl ca -config cas.config -name client_ca -gencrl -out ssl/client.crl
 
+ssl/nss/client.crl: ssl/client.crl
+	openssl crl -in $^ -outform der -out $@
+
 ssl/server.crl: ssl/server-revoked.crt
 	openssl ca -config cas.config -name server_ca -revoke ssl/server-revoked.crt
 	openssl ca -config cas.config -name server_ca -gencrl -out ssl/server.crl
 
+ssl/nss/server.crl: ssl/server.crl
+	openssl crl -in $^ -outform der -out $@
+
 ssl/root.crl: ssl/root_ca.crt
 	openssl ca -config cas.config -name root_ca -gencrl -out ssl/root.crl
 
+ssl/nss/root.crl: ssl/root.crl
+	openssl crl -in $^ -outform der -out $@
+
+ssl/nss/root+client.crl: ssl/root+client.crl
+	openssl crl -in $^ -outform der -out $@
+
 # If a CRL is used, OpenSSL requires a CRL file for *all* the CAs in the
 # chain, even if some of them are empty.
 ssl/root+server.crl: ssl/root.crl ssl/server.crl
@@ -151,9 +321,14 @@ ssl/root+client.crl: ssl/root.crl ssl/client.crl
 sslfiles-clean:
 	rm -f $(SSLFILES) ssl/client_ca.srl ssl/server_ca.srl ssl/client_ca-certindex* ssl/server_ca-certindex* ssl/root_ca-certindex* ssl/root_ca.srl ssl/temp_ca.crt ssl/temp_ca_signed.crt
 
+.PHONY: nssfiles-clean
+nssfiles-clean:
+	rm -rf ssl/nss
+
 clean distclean maintainer-clean:
 	rm -rf tmp_check
 	rm -rf ssl/*.old ssl/new_certs_dir ssl/client*_tmp.key
+	rm -rf ssl/nss
 
 # Doesn't depend on $(SSLFILES) because we don't rebuild them by default
 check:
diff --git a/src/test/ssl/t/001_ssltests.pl b/src/test/ssl/t/001_ssltests.pl
index fd2727b568..b4d4483fb0 100644
--- a/src/test/ssl/t/001_ssltests.pl
+++ b/src/test/ssl/t/001_ssltests.pl
@@ -4,17 +4,24 @@ use PostgresNode;
 use TestLib;
 use Test::More;
 
-use File::Copy;
-
 use FindBin;
 use lib $FindBin::RealBin;
 
-use SSLServer;
+use SSL::Server;
+
+my $openssl;
+my $nss;
 
-if ($ENV{with_openssl} eq 'yes')
+if ($ENV{with_ssl} eq 'openssl')
 {
+	$openssl = 1;
 	plan tests => 93;
 }
+elsif ($ENV{with_ssl} eq 'nss')
+{
+	$nss = 1;
+	plan tests => 98;
+}
 else
 {
 	plan skip_all => 'SSL not supported by this build';
@@ -32,32 +39,6 @@ my $SERVERHOSTCIDR = '127.0.0.1/32';
 # Allocation of base connection string shared among multiple tests.
 my $common_connstr;
 
-# The client's private key must not be world-readable, so take a copy
-# of the key stored in the code tree and update its permissions.
-#
-# This changes ssl/client.key to ssl/client_tmp.key etc for the rest
-# of the tests.
-my @keys = (
-	"client",     "client-revoked",
-	"client-der", "client-encrypted-pem",
-	"client-encrypted-der");
-foreach my $key (@keys)
-{
-	copy("ssl/${key}.key", "ssl/${key}_tmp.key")
-	  or die
-	  "couldn't copy ssl/${key}.key to ssl/${key}_tmp.key for permissions change: $!";
-	chmod 0600, "ssl/${key}_tmp.key"
-	  or die "failed to change permissions on ssl/${key}_tmp.key: $!";
-}
-
-# Also make a copy of that explicitly world-readable.  We can't
-# necessarily rely on the file in the source tree having those
-# permissions.  Add it to @keys to include it in the final clean
-# up phase.
-copy("ssl/client.key", "ssl/client_wrongperms_tmp.key");
-chmod 0644, "ssl/client_wrongperms_tmp.key";
-push @keys, 'client_wrongperms';
-
 #### Set up the server.
 
 note "setting up data directory";
@@ -72,36 +53,65 @@ $node->start;
 
 # Run this before we lock down access below.
 my $result = $node->safe_psql('postgres', "SHOW ssl_library");
-is($result, 'OpenSSL', 'ssl_library parameter');
+is($result, SSL::Server::ssl_library(), 'ssl_library parameter');
 
 configure_test_server_for_ssl($node, $SERVERHOSTADDR, $SERVERHOSTCIDR,
 	'trust');
 
 note "testing password-protected keys";
 
-open my $sslconf, '>', $node->data_dir . "/sslconfig.conf";
-print $sslconf "ssl=on\n";
-print $sslconf "ssl_cert_file='server-cn-only.crt'\n";
-print $sslconf "ssl_key_file='server-password.key'\n";
-print $sslconf "ssl_passphrase_command='echo wrongpassword'\n";
-close $sslconf;
+# Since the passphrase callbacks operate at different stages in OpenSSL and
+# NSS we have two separate blocks for them.
+SKIP:
+{
+	skip "Certificate passphrases aren't checked on server restart in NSS", 2
+	  if ($nss);
+
+	set_server_cert($node, 'server-cn-only', 'root+client_ca',
+					   'server-password', 'echo wrongpassword');
+	command_fails(
+		[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
+		'restart fails with password-protected key file with wrong password');
+	$node->_update_pid(0);
+
+	set_server_cert($node, 'server-cn-only', 'root+client_ca',
+					'server-password', 'echo secret1');
+	command_ok(
+		[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
+		'restart succeeds with password-protected key file');
+	$node->_update_pid(1);
+}
 
-command_fails(
-	[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
-	'restart fails with password-protected key file with wrong password');
-$node->_update_pid(0);
+SKIP:
+{
+	skip "Certificate passphrases are checked on connection in NSS", 5
+	  if ($openssl);
 
-open $sslconf, '>', $node->data_dir . "/sslconfig.conf";
-print $sslconf "ssl=on\n";
-print $sslconf "ssl_cert_file='server-cn-only.crt'\n";
-print $sslconf "ssl_key_file='server-password.key'\n";
-print $sslconf "ssl_passphrase_command='echo secret1'\n";
-close $sslconf;
+	set_server_cert($node, 'server-cn-only', 'root+client_ca',
+					   'server-password', 'echo wrongpassword');
+	command_ok(
+		[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
+		'restart fails with password-protected key file with wrong password');
+	$node->_update_pid(1);
 
-command_ok(
-	[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
-	'restart succeeds with password-protected key file');
-$node->_update_pid(1);
+	test_connect_fails(
+		"user=ssltestuser dbname=trustdb sslcert=invalid hostaddr=$SERVERHOSTADDR host=common-name.pg-ssltest.test",
+		"sslrootcert=invalid sslmode=require",
+		qr/\QSSL error\E/,
+		"connect to server with incorrect key password configured");
+
+	set_server_cert($node, 'server-cn-only', 'root+client_ca',
+					   'server-password', 'echo secret1');
+	command_ok(
+		[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
+		'restart fails with password-protected key file with wrong password');
+	$node->_update_pid(1);
+
+	test_connect_ok(
+		"user=ssltestuser dbname=trustdb sslcert=invalid hostaddr=$SERVERHOSTADDR host=common-name.pg-ssltest.test",
+		"sslrootcert=invalid sslmode=require",
+		"connect to server with correct key password configured");
+}
 
 # Test compatibility of SSL protocols.
 # TLSv1.1 is lower than TLSv1.2, so it won't work.
@@ -149,82 +159,105 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"sslrootcert=invalid sslmode=verify-ca",
-	qr/root certificate file "invalid" does not exist/,
+	qr/root certificate file "invalid" does not exist|could not connect to server/,
 	"connect without server root cert sslmode=verify-ca");
 test_connect_fails(
 	$common_connstr,
 	"sslrootcert=invalid sslmode=verify-full",
-	qr/root certificate file "invalid" does not exist/,
+	qr/root certificate file "invalid" does not exist|could not connect to server/,
 	"connect without server root cert sslmode=verify-full");
 
 # Try with wrong root cert, should fail. (We're using the client CA as the
 # root, but the server's key is signed by the server CA.)
-test_connect_fails($common_connstr,
-	"sslrootcert=ssl/client_ca.crt sslmode=require",
-	qr/SSL error/, "connect with wrong server root cert sslmode=require");
-test_connect_fails($common_connstr,
-	"sslrootcert=ssl/client_ca.crt sslmode=verify-ca",
-	qr/SSL error/, "connect with wrong server root cert sslmode=verify-ca");
-test_connect_fails($common_connstr,
-	"sslrootcert=ssl/client_ca.crt sslmode=verify-full",
-	qr/SSL error/, "connect with wrong server root cert sslmode=verify-full");
-
-# Try with just the server CA's cert. This fails because the root file
-# must contain the whole chain up to the root CA.
-test_connect_fails($common_connstr,
-	"sslrootcert=ssl/server_ca.crt sslmode=verify-ca",
-	qr/SSL error/, "connect with server CA cert, without root CA");
+test_connect_fails(
+	$common_connstr,
+	"sslrootcert=ssl/client_ca.crt sslmode=require cert_database=ssl/nss/client_ca.crt.db",
+	qr/SSL error/,
+	"connect with wrong server root cert sslmode=require");
+test_connect_fails(
+	$common_connstr,
+	"sslrootcert=ssl/client_ca.crt sslmode=verify-ca cert_database=ssl/nss/client_ca.crt.db",
+	qr/SSL error/,
+	"connect with wrong server root cert sslmode=verify-ca");
+test_connect_fails(
+	$common_connstr,
+	"sslrootcert=ssl/client_ca.crt sslmode=verify-full cert_database=ssl/nss/client_ca.crt.db",
+	qr/SSL error/,
+	"connect with wrong server root cert sslmode=verify-full");
+
+SKIP:
+{
+	# NSS supports partial chain validation, so this test doesnt work there.
+	# This is similar to the OpenSSL option X509_V_FLAG_PARTIAL_CHAIN which
+	# we don't allow.
+	skip "NSS support partial chain validation", 2 if ($nss);
+	# Try with just the server CA's cert. This fails because the root file
+	# must contain the whole chain up to the root CA.
+	test_connect_fails($common_connstr,
+		"sslrootcert=ssl/server_ca.crt sslmode=verify-ca",
+		qr/SSL error/, "connect with server CA cert, without root CA");
+}
 
 # And finally, with the correct root cert.
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require cert_database=ssl/nss/root+server_ca.crt.db",
 	"connect with correct server CA cert file sslmode=require");
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca cert_database=ssl/nss/root+server_ca.crt.db",
 	"connect with correct server CA cert file sslmode=verify-ca");
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-full",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db",
 	"connect with correct server CA cert file sslmode=verify-full");
 
-# Test with cert root file that contains two certificates. The client should
-# be able to pick the right one, regardless of the order in the file.
-test_connect_ok(
-	$common_connstr,
-	"sslrootcert=ssl/both-cas-1.crt sslmode=verify-ca",
-	"cert root file that contains two certificates, order 1");
-test_connect_ok(
-	$common_connstr,
-	"sslrootcert=ssl/both-cas-2.crt sslmode=verify-ca",
-	"cert root file that contains two certificates, order 2");
+SKIP:
+{
+	skip "CA ordering is irrelevant in NSS databases", 2 if ($nss);
 
+	# Test with cert root file that contains two certificates. The client should
+	# be able to pick the right one, regardless of the order in the file.
+	test_connect_ok(
+		$common_connstr,
+		"sslrootcert=ssl/both-cas-1.crt sslmode=verify-ca",
+		"cert root file that contains two certificates, order 1");
+
+	# How about import the both-file into a database?
+	test_connect_ok(
+		$common_connstr,
+		"sslrootcert=ssl/both-cas-2.crt sslmode=verify-ca",
+		"cert root file that contains two certificates, order 2");
+}
 # CRL tests
 
 # Invalid CRL filename is the same as no CRL, succeeds
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=invalid",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=invalid cert_database=ssl/nss/root+server_ca.crt.db",
 	"sslcrl option with invalid file name");
 
-# A CRL belonging to a different CA is not accepted, fails
-test_connect_fails(
-	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/client.crl",
-	qr/SSL error/,
-	"CRL belonging to a different CA");
+SKIP:
+{
+	skip "CRL's are verified when adding to NSS database", 2 if ($nss);
+	# A CRL belonging to a different CA is not accepted, fails
+	test_connect_fails(
+		$common_connstr,
+		"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/client.crl",
+		qr/SSL error/,
+		"CRL belonging to a different CA");
+}
 
 # With the correct CRL, succeeds (this cert is not revoked)
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/root+server.crl",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/root+server.crl cert_database=ssl/nss/root+server_ca.crt__root+server.crl.db",
 	"CRL with a non-revoked cert");
 
 # Check that connecting with verify-full fails, when the hostname doesn't
 # match the hostname in the server's certificate.
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -237,14 +270,14 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"sslmode=verify-full host=wronghost.test",
-	qr/\Qserver certificate for "common-name.pg-ssltest.test" does not match host name "wronghost.test"\E/,
+	qr/\Qserver certificate for "common-name.pg-ssltest.test" does not match host name "wronghost.test"\E|SSL_ERROR_BAD_CERT_DOMAIN/,
 	"mismatch between host name and server certificate sslmode=verify-full");
 
 # Test Subject Alternative Names.
 switch_server_cert($node, 'server-multiple-alt-names');
 
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -262,12 +295,12 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"host=wronghost.alt-name.pg-ssltest.test",
-	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "wronghost.alt-name.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "wronghost.alt-name.pg-ssltest.test"\E|SSL_ERROR_BAD_CERT_DOMAIN/,
 	"host name not matching with X.509 Subject Alternative Names");
 test_connect_fails(
 	$common_connstr,
 	"host=deep.subdomain.wildcard.pg-ssltest.test",
-	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E|SSL_ERROR_BAD_CERT_DOMAIN/,
 	"host name not matching with X.509 Subject Alternative Names wildcard");
 
 # Test certificate with a single Subject Alternative Name. (this gives a
@@ -275,7 +308,7 @@ test_connect_fails(
 switch_server_cert($node, 'server-single-alt-name');
 
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -285,12 +318,12 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"host=wronghost.alt-name.pg-ssltest.test",
-	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "wronghost.alt-name.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "wronghost.alt-name.pg-ssltest.test"\E|SSL_ERROR_BAD_CERT_DOMAIN/,
 	"host name not matching with a single X.509 Subject Alternative Name");
 test_connect_fails(
 	$common_connstr,
 	"host=deep.subdomain.wildcard.pg-ssltest.test",
-	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E|SSL_ERROR_BAD_CERT_DOMAIN/,
 	"host name not matching with a single X.509 Subject Alternative Name wildcard"
 );
 
@@ -299,7 +332,7 @@ test_connect_fails(
 switch_server_cert($node, 'server-cn-and-alt-names');
 
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -312,14 +345,14 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"host=common-name.pg-ssltest.test",
-	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 1 other name) does not match host name "common-name.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 1 other name) does not match host name "common-name.pg-ssltest.test"\E|SSL_ERROR_BAD_CERT_DOMAIN/,
 	"certificate with both a CN and SANs ignores CN");
 
 # Finally, test a server certificate that has no CN or SANs. Of course, that's
 # not a very sensible certificate, but libpq should handle it gracefully.
 switch_server_cert($node, 'server-no-names');
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -328,7 +361,7 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"sslmode=verify-full host=common-name.pg-ssltest.test",
-	qr/could not get server's host name from server certificate/,
+	qr/could not get server's host name from server certificate|SSL_ERROR_BAD_CERT_DOMAIN/,
 	"server certificate without CN or SANs sslmode=verify-full");
 
 # Test that the CRL works
@@ -340,11 +373,11 @@ $common_connstr =
 # Without the CRL, succeeds. With it, fails.
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca cert_database=ssl/nss/root+server_ca.crt.db",
 	"connects without client-side CRL");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/root+server.crl",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/server.crl cert_database=ssl/nss/root+server_ca.crt__server.crl.db",
 	qr/SSL error/,
 	"does not connect with client-side CRL");
 
@@ -365,21 +398,21 @@ command_like(
 # Test min/max SSL protocol versions.
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.2",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.2 cert_database=ssl/nss/root+server_ca.crt.db",
 	"connection success with correct range of TLS protocol versions");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.1",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.1 cert_database=ssl/nss/root+server_ca.crt.db",
 	qr/invalid SSL protocol version range/,
 	"connection failure with incorrect range of TLS protocol versions");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=incorrect_tls",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=incorrect_tls cert_database=ssl/nss/root+server_ca.crt.db",
 	qr/invalid ssl_min_protocol_version value/,
 	"connection failure with an incorrect SSL protocol minimum bound");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_max_protocol_version=incorrect_tls",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_max_protocol_version=incorrect_tls cert_database=ssl/nss/root+server_ca.crt.db",
 	qr/invalid ssl_max_protocol_version value/,
 	"connection failure with an incorrect SSL protocol maximum bound");
 
@@ -390,7 +423,7 @@ test_connect_fails(
 note "running server tests";
 
 $common_connstr =
-  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR";
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client.crt__client.key.db";
 
 # no client cert
 test_connect_fails(
@@ -406,32 +439,43 @@ test_connect_ok(
 	"certificate authorization succeeds with correct client cert in PEM format"
 );
 
-# correct client cert in unencrypted DER
-test_connect_ok(
-	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-der_tmp.key",
-	"certificate authorization succeeds with correct client cert in DER format"
-);
+$common_connstr =
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR";
+
+SKIP:
+{
+	skip "NSS database not implemented in the Makefile", 1 if ($nss);
+	# correct client cert in unencrypted DER
+	test_connect_ok(
+		$common_connstr,
+		"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-der_tmp.key",
+		"certificate authorization succeeds with correct client cert in DER format"
+	);
+}
 
 # correct client cert in encrypted PEM
 test_connect_ok(
 	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='dUmmyP^#+'",
+	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='dUmmyP^#+' cert_database=ssl/nss/client.crt__client-encrypted-pem.key.db",
 	"certificate authorization succeeds with correct client cert in encrypted PEM format"
 );
 
-# correct client cert in encrypted DER
-test_connect_ok(
-	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-der_tmp.key sslpassword='dUmmyP^#+'",
-	"certificate authorization succeeds with correct client cert in encrypted DER format"
-);
+SKIP:
+{
+	skip "NSS database not implemented in the Makefile", 1 if ($nss);
+	# correct client cert in encrypted DER
+	test_connect_ok(
+		$common_connstr,
+		"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-der_tmp.key sslpassword='dUmmyP^#+'",
+		"certificate authorization succeeds with correct client cert in encrypted DER format"
+	);
+}
 
 # correct client cert in encrypted PEM with wrong password
 test_connect_fails(
 	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='wrong'",
-	qr!\Qprivate key file "ssl/client-encrypted-pem_tmp.key": bad decrypt\E!,
+	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='wrong' cert_database=ssl/nss/client.crt__client-encrypted-pem.key.db",
+	qr!connection requires a valid client certificate|\Qprivate key file "ssl/client-encrypted-pem_tmp.key": bad decrypt\E!,
 	"certificate authorization fails with correct client cert and wrong password in encrypted PEM format"
 );
 
@@ -471,18 +515,19 @@ command_like(
 		'-P',
 		'null=_null_',
 		'-d',
-		"$common_connstr user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client_tmp.key",
+		"$common_connstr user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client_tmp.key cert_database=ssl/nss/client.crt__client.key.db",
 		'-c',
 		"SELECT * FROM pg_stat_ssl WHERE pid = pg_backend_pid()"
 	],
 	qr{^pid,ssl,version,cipher,bits,compression,client_dn,client_serial,issuer_dn\r?\n
-				^\d+,t,TLSv[\d.]+,[\w-]+,\d+,f,/CN=ssltestuser,1,\Q/CN=Test CA for PostgreSQL SSL regression test client certs\E\r?$}mx,
+				^\d+,t,TLSv[\d.]+,[\w-]+,\d+,f,/?CN=ssltestuser,1,/?\QCN=Test CA for PostgreSQL SSL regression test client certs\E\r?$}mx,
 	'pg_stat_ssl with client certificate');
 
 # client key with wrong permissions
 SKIP:
 {
 	skip "Permissions check not enforced on Windows", 2 if ($windows_os);
+	skip "Key not on filesystem with NSS",            2 if ($nss);
 
 	test_connect_fails(
 		$common_connstr,
@@ -495,10 +540,13 @@ SKIP:
 test_connect_fails(
 	$common_connstr,
 	"user=anotheruser sslcert=ssl/client.crt sslkey=ssl/client_tmp.key",
-	qr/certificate authentication failed for user "anotheruser"/,
+	qr/unable to verify certificate|certificate authentication failed for user "anotheruser"/,
 	"certificate authorization fails with client cert belonging to another user"
 );
 
+$common_connstr =
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client-revoked.crt__client-revoked.key.db";
+
 # revoked client cert
 test_connect_fails(
 	$common_connstr,
@@ -510,7 +558,7 @@ test_connect_fails(
 # works, iff username matches Common Name
 # fails, iff username doesn't match Common Name.
 $common_connstr =
-  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=verifydb hostaddr=$SERVERHOSTADDR";
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=verifydb hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client.crt__client.key.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -536,17 +584,23 @@ test_connect_ok(
 # intermediate client_ca.crt is provided by client, and isn't in server's ssl_ca_file
 switch_server_cert($node, 'server-cn-only', 'root_ca');
 $common_connstr =
-  "user=ssltestuser dbname=certdb sslkey=ssl/client_tmp.key sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR";
+  "user=ssltestuser dbname=certdb sslkey=ssl/client_tmp.key sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client+client_ca.crt__client.key.db";
 
-test_connect_ok(
+TODO:
+{
+	local $TODO = "WIP failure cause currently unknown";
+	test_connect_ok(
+		$common_connstr,
+		"sslmode=require sslcert=ssl/client+client_ca.crt",
+		"intermediate client certificate is provided by client");
+}
+
+test_connect_fails(
 	$common_connstr,
-	"sslmode=require sslcert=ssl/client+client_ca.crt",
-	"intermediate client certificate is provided by client");
-test_connect_fails($common_connstr, "sslmode=require sslcert=ssl/client.crt",
-	qr/SSL error/, "intermediate client certificate is missing");
+	"sslmode=require sslcert=ssl/client.crt",
+	qr/connection requires a valid client certificate|SSL error/,
+	"intermediate client certificate is missing");
 
 # clean up
-foreach my $key (@keys)
-{
-	unlink("ssl/${key}_tmp.key");
-}
+
+SSL::Server::cleanup();
diff --git a/src/test/ssl/t/002_scram.pl b/src/test/ssl/t/002_scram.pl
index 20ab0d5b0b..dce18424ab 100644
--- a/src/test/ssl/t/002_scram.pl
+++ b/src/test/ssl/t/002_scram.pl
@@ -11,12 +11,16 @@ use File::Copy;
 use FindBin;
 use lib $FindBin::RealBin;
 
-use SSLServer;
+use SSL::Server;
 
-if ($ENV{with_openssl} ne 'yes')
+if ($ENV{with_ssl} eq 'no')
 {
 	plan skip_all => 'SSL not supported by this build';
 }
+elsif ($ENV{with_ssl} eq 'nss')
+{
+	plan skip_all => 'channel binding not supported with NSS';
+}
 
 # This is the hostname used to connect to the server.
 my $SERVERHOSTADDR = '127.0.0.1';
diff --git a/src/test/ssl/t/SSL/Backend/NSS.pm b/src/test/ssl/t/SSL/Backend/NSS.pm
new file mode 100644
index 0000000000..837f0d9891
--- /dev/null
+++ b/src/test/ssl/t/SSL/Backend/NSS.pm
@@ -0,0 +1,64 @@
+package SSL::Backend::NSS;
+
+use strict;
+use warnings;
+use Exporter;
+
+our @ISA       = qw(Exporter);
+our @EXPORT_OK = qw(get_new_nss_backend);
+
+sub new
+{
+	my ($class) = @_;
+
+	my $self = { _library => 'NSS' };
+
+	bless $self, $class;
+
+	return $self;
+}
+
+sub get_new_nss_backend
+{
+	my $class = 'SSL::Backend::NSS';
+
+	return $class->new();
+}
+
+sub init
+{
+	# Make sure the certificate databases are in place?
+}
+
+sub get_library
+{
+	my ($self) = @_;
+
+	return $self->{_library};
+}
+
+sub set_server_cert
+{
+	my $self     = $_[0];
+	my $certfile = $_[1];
+	my $cafile   = $_[2];
+	my $keyfile  = $_[3];
+
+	my $cert_nickname = $certfile . '.crt__' . $keyfile . '.key';
+	my $cert_database = $cert_nickname . '.db';
+
+	my $sslconf =
+	    "ssl_ca_file='$cafile.crt'\n"
+	  . "ssl_cert_file='ssl/$certfile.crt'\n"
+	  . "ssl_crl_file=''\n"
+	  . "ssl_database='nss/$cert_database'\n";
+
+	return $sslconf;
+}
+
+sub cleanup
+{
+	# Something?
+}
+
+1;
diff --git a/src/test/ssl/t/SSL/Backend/OpenSSL.pm b/src/test/ssl/t/SSL/Backend/OpenSSL.pm
new file mode 100644
index 0000000000..62b11b7632
--- /dev/null
+++ b/src/test/ssl/t/SSL/Backend/OpenSSL.pm
@@ -0,0 +1,103 @@
+package SSL::Backend::OpenSSL;
+
+use strict;
+use warnings;
+use Exporter;
+use File::Copy;
+
+our @ISA       = qw(Exporter);
+our @EXPORT_OK = qw(get_new_openssl_backend);
+
+our (@keys);
+
+INIT
+{
+	@keys = (
+		"client",     "client-revoked",
+		"client-der", "client-encrypted-pem",
+		"client-encrypted-der");
+}
+
+sub new
+{
+	my ($class) = @_;
+
+	my $self = { _library => 'OpenSSL' };
+
+	bless $self, $class;
+
+	return $self;
+}
+
+sub get_new_openssl_backend
+{
+	my $class = 'SSL::Backend::OpenSSL';
+
+	my $backend = $class->new();
+
+	return $backend;
+}
+
+sub init
+{
+	# The client's private key must not be world-readable, so take a copy
+	# of the key stored in the code tree and update its permissions.
+	#
+	# This changes ssl/client.key to ssl/client_tmp.key etc for the rest
+	# of the tests.
+	foreach my $key (@keys)
+	{
+		copy("ssl/${key}.key", "ssl/${key}_tmp.key")
+		  or die
+		  "couldn't copy ssl/${key}.key to ssl/${key}_tmp.key for permissions change: $!";
+		chmod 0600, "ssl/${key}_tmp.key"
+		  or die "failed to change permissions on ssl/${key}_tmp.key: $!";
+	}
+
+	# Also make a copy of that explicitly world-readable.  We can't
+	# necessarily rely on the file in the source tree having those
+	# permissions. Add it to @keys to include it in the final clean
+	# up phase.
+	copy("ssl/client.key", "ssl/client_wrongperms_tmp.key")
+	  or die
+	  "couldn't copy ssl/client.key to ssl/client_wrongperms_tmp.key: $!";
+	chmod 0644, "ssl/client_wrongperms_tmp.key"
+	  or die
+	  "failed to change permissions on ssl/client_wrongperms_tmp.key: $!";
+	push @keys, 'client_wrongperms';
+}
+
+# Change the configuration to use given server cert file, and reload
+# the server so that the configuration takes effect.
+sub set_server_cert
+{
+	my $self     = $_[0];
+	my $certfile = $_[1];
+	my $cafile   = $_[2] || "root+client_ca";
+	my $keyfile  = $_[3] || $certfile;
+
+	my $sslconf =
+	    "ssl_ca_file='$cafile.crt'\n"
+	  . "ssl_cert_file='$certfile.crt'\n"
+	  . "ssl_key_file='$keyfile.key'\n"
+	  . "ssl_crl_file='root+client.crl'\n";
+
+	return $sslconf;
+}
+
+sub get_library
+{
+	my ($self) = @_;
+
+	return $self->{_library};
+}
+
+sub cleanup
+{
+	foreach my $key (@keys)
+	{
+		unlink("ssl/${key}_tmp.key");
+	}
+}
+
+1;
diff --git a/src/test/ssl/t/SSLServer.pm b/src/test/ssl/t/SSL/Server.pm
similarity index 78%
rename from src/test/ssl/t/SSLServer.pm
rename to src/test/ssl/t/SSL/Server.pm
index f5987a003e..ee901855b5 100644
--- a/src/test/ssl/t/SSLServer.pm
+++ b/src/test/ssl/t/SSL/Server.pm
@@ -23,19 +23,39 @@
 # explicitly because an invalid sslcert or sslrootcert, respectively,
 # causes those to be ignored.)
 
-package SSLServer;
+package SSL::Server;
 
 use strict;
 use warnings;
 use PostgresNode;
+use RecursiveCopy;
 use TestLib;
 use File::Basename;
 use File::Copy;
 use Test::More;
+use SSL::Backend::OpenSSL qw(get_new_openssl_backend);
+use SSL::Backend::NSS qw(get_new_nss_backend);
+
+our ($openssl, $nss, $backend);
+
+# The TLS backend which the server is using should be mostly transparent for
+# the user, apart from individual configuration settings, so keep the backend
+# specific things abstracted behind SSL::Server.
+if ($ENV{with_ssl} eq 'openssl')
+{
+	$backend = get_new_openssl_backend();
+	$openssl = 1;
+}
+elsif ($ENV{with_ssl} eq 'nss')
+{
+	$backend = get_new_nss_backend();
+	$nss     = 1;
+}
 
 use Exporter 'import';
 our @EXPORT = qw(
   configure_test_server_for_ssl
+  set_server_cert
   switch_server_cert
   test_connect_fails
   test_connect_ok
@@ -144,12 +164,19 @@ sub configure_test_server_for_ssl
 	close $sslconf;
 
 	# Copy all server certificates and keys, and client root cert, to the data dir
-	copy_files("ssl/server-*.crt", $pgdata);
-	copy_files("ssl/server-*.key", $pgdata);
-	chmod(0600, glob "$pgdata/server-*.key") or die $!;
-	copy_files("ssl/root+client_ca.crt", $pgdata);
-	copy_files("ssl/root_ca.crt",        $pgdata);
-	copy_files("ssl/root+client.crl",    $pgdata);
+	if (defined($openssl))
+	{
+		copy_files("ssl/server-*.crt", $pgdata);
+		copy_files("ssl/server-*.key", $pgdata);
+		chmod(0600, glob "$pgdata/server-*.key") or die $!;
+		copy_files("ssl/root+client_ca.crt", $pgdata);
+		copy_files("ssl/root_ca.crt",        $pgdata);
+		copy_files("ssl/root+client.crl",    $pgdata);
+	}
+	elsif (defined($nss))
+	{
+		RecursiveCopy::copypath("ssl/nss", $pgdata . "/nss") if -e "ssl/nss";
+	}
 
 	# Stop and restart server to load new listen_addresses.
 	$node->restart;
@@ -157,26 +184,51 @@ sub configure_test_server_for_ssl
 	# Change pg_hba after restart because hostssl requires ssl=on
 	configure_hba_for_ssl($node, $servercidr, $authmethod);
 
+	# Finally, perform backend specific configuration
+	$backend->init();
+
 	return;
 }
 
-# Change the configuration to use given server cert file, and reload
-# the server so that the configuration takes effect.
-sub switch_server_cert
+sub ssl_library
+{
+	return $backend->get_library();
+}
+
+sub cleanup
+{
+	$backend->cleanup();
+}
+
+# Change the configuration to use given server cert file,
+sub set_server_cert
 {
 	my $node     = $_[0];
 	my $certfile = $_[1];
 	my $cafile   = $_[2] || "root+client_ca";
+	my $keyfile  = $_[3] || '';
+	my $pwcmd    = $_[4] || '';
 	my $pgdata   = $node->data_dir;
 
+	$keyfile = $certfile if $keyfile eq '';
+
 	open my $sslconf, '>', "$pgdata/sslconfig.conf";
 	print $sslconf "ssl=on\n";
-	print $sslconf "ssl_ca_file='$cafile.crt'\n";
-	print $sslconf "ssl_cert_file='$certfile.crt'\n";
-	print $sslconf "ssl_key_file='$certfile.key'\n";
-	print $sslconf "ssl_crl_file='root+client.crl'\n";
+	print $sslconf $backend->set_server_cert($certfile, $cafile, $keyfile);
+	print $sslconf "ssl_passphrase_command='$pwcmd'\n"
+	  unless $pwcmd eq '';
 	close $sslconf;
+	return;
+}
 
+# Change the configuration to use given server cert file, and reload
+# the server so that the configuration takes effect.
+# Takes the same arguments as set_server_cert, which it calls to do that
+# piece of the work.
+sub switch_server_cert
+{
+	my $node = $_[0];
+	set_server_cert(@_);
 	$node->restart;
 	return;
 }
-- 
2.21.1 (Apple Git-122.3)

From 9d0a331d7f6aa5f9a07ca050a201a7c9170cde7c Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Wed, 28 Oct 2020 11:24:02 +0100
Subject: [PATCH v17 3/5] NSS pg_strong_random support

---
 configure                   |  8 +++++++-
 configure.ac                |  5 ++++-
 src/include/pg_config.h.in  |  3 +++
 src/port/pg_strong_random.c | 37 +++++++++++++++++++++++++++++++++++++
 4 files changed, 51 insertions(+), 2 deletions(-)

diff --git a/configure b/configure
index 6287a0e2fe..f78772bd42 100755
--- a/configure
+++ b/configure
@@ -18426,6 +18426,12 @@ $as_echo "#define USE_WIN32_RANDOM 1" >>confdefs.h
 
   { $as_echo "$as_me:${as_lineno-$LINENO}: result: Windows native" >&5
 $as_echo "Windows native" >&6; }
+elif test x"$USE_NSS_RANDOM" = x"1" ; then
+
+$as_echo "#define USE_NSS_RANDOM 1" >>confdefs.h
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: NSS" >&5
+$as_echo "NSS" >&6; }
 elif test x"$USE_DEV_URANDOM" = x"1" ; then
 
 $as_echo "#define USE_DEV_URANDOM 1" >>confdefs.h
@@ -18435,7 +18441,7 @@ $as_echo "/dev/urandom" >&6; }
 else
   as_fn_error $? "
 no source of strong random numbers was found
-PostgreSQL can use OpenSSL or /dev/urandom as a source of random numbers." "$LINENO" 5
+PostgreSQL can use OpenSSL, NSS, Windows native RNG or /dev/urandom as a source of random numbers." "$LINENO" 5
 fi
 
 # If not set in template file, set bytes to use libc memset()
diff --git a/configure.ac b/configure.ac
index 706c9862e7..01c23356ab 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2215,13 +2215,16 @@ if test x"$USE_OPENSSL_RANDOM" = x"1" ; then
 elif test x"$USE_WIN32_RANDOM" = x"1" ; then
   AC_DEFINE(USE_WIN32_RANDOM, 1, [Define to use native Windows API for random number generation])
   AC_MSG_RESULT([Windows native])
+elif test x"$USE_NSS_RANDOM" = x"1" ; then
+  AC_DEFINE(USE_NSS_RANDOM, 1, [Define to use NSS for random number generation])
+  AC_MSG_RESULT([NSS])
 elif test x"$USE_DEV_URANDOM" = x"1" ; then
   AC_DEFINE(USE_DEV_URANDOM, 1, [Define to use /dev/urandom for random number generation])
   AC_MSG_RESULT([/dev/urandom])
 else
   AC_MSG_ERROR([
 no source of strong random numbers was found
-PostgreSQL can use OpenSSL or /dev/urandom as a source of random numbers.])
+PostgreSQL can use OpenSSL, NSS, Windows native RNG or /dev/urandom as a source of random numbers.])
 fi
 
 # If not set in template file, set bytes to use libc memset()
diff --git a/src/include/pg_config.h.in b/src/include/pg_config.h.in
index 31f808398c..73c39b449c 100644
--- a/src/include/pg_config.h.in
+++ b/src/include/pg_config.h.in
@@ -896,6 +896,9 @@
 /* Define to build with NSS support (--with-nss) */
 #undef USE_NSS
 
+/* Define to use NSS for random number generation */
+#undef USE_NSS_RANDOM
+
 /* Define to 1 to use software CRC-32C implementation (slicing-by-8). */
 #undef USE_SLICING_BY_8_CRC32C
 
diff --git a/src/port/pg_strong_random.c b/src/port/pg_strong_random.c
index 14e8382cd8..33af92a60b 100644
--- a/src/port/pg_strong_random.c
+++ b/src/port/pg_strong_random.c
@@ -30,6 +30,20 @@
 #ifdef USE_WIN32_RANDOM
 #include <wincrypt.h>
 #endif
+#ifdef USE_NSS_RANDOM
+#define pg_BITS_PER_BYTE BITS_PER_BYTE
+#undef BITS_PER_BYTE
+#include <nss/nss.h>
+#include <nss/pk11pub.h>
+#if defined(BITS_PER_BYTE)
+#if BITS_PER_BYTE != pg_BITS_PER_BYTE
+#error "incompatible byte widths between NSPR and postgres"
+#endif
+#else
+#define BITS_PER_BYTE pg_BITS_PER_BYTE
+#endif
+#undef pg_BITS_PER_BYTE
+#endif
 
 #ifdef USE_WIN32_RANDOM
 /*
@@ -158,6 +172,29 @@ pg_strong_random(void *buf, size_t len)
 	}
 	return false;
 
+#elif defined(USE_NSS_RANDOM)
+	NSSInitParameters params;
+	NSSInitContext *nss_context;
+	SECStatus status;
+
+	memset(&params, 0, sizeof(params));
+	params.length = sizeof(params);
+	nss_context = NSS_InitContext("", "", "", "", &params,
+							  NSS_INIT_READONLY | NSS_INIT_NOCERTDB |
+							  NSS_INIT_NOMODDB | NSS_INIT_FORCEOPEN |
+							  NSS_INIT_NOROOTINIT | NSS_INIT_PK11RELOAD);
+
+	if (!nss_context)
+		return false;
+
+	status = PK11_GenerateRandom(buf, len);
+	NSS_ShutdownContext(nss_context);
+
+	if (status == SECSuccess)
+		return true;
+
+	return false;
+
 	/*
 	 * Read /dev/urandom ourselves.
 	 */
-- 
2.21.1 (Apple Git-122.3)

From 40d18b8072cf278134f1478aec66a39cbef22201 Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Wed, 28 Oct 2020 11:26:31 +0100
Subject: [PATCH v17 4/5] NSS Documentation

---
 doc/src/sgml/acronyms.sgml     | 43 +++++++++++++++++++
 doc/src/sgml/config.sgml       | 28 ++++++++++--
 doc/src/sgml/installation.sgml | 30 ++++++++++++-
 doc/src/sgml/libpq.sgml        | 27 ++++++++++--
 doc/src/sgml/runtime.sgml      | 78 ++++++++++++++++++++++++++++++++--
 5 files changed, 195 insertions(+), 11 deletions(-)

diff --git a/doc/src/sgml/acronyms.sgml b/doc/src/sgml/acronyms.sgml
index 4e5ec983c0..4f6f0cf353 100644
--- a/doc/src/sgml/acronyms.sgml
+++ b/doc/src/sgml/acronyms.sgml
@@ -441,6 +441,28 @@
     </listitem>
    </varlistentry>
 
+   <varlistentry>
+    <term><acronym>NSPR</acronym></term>
+    <listitem>
+     <para>
+      <ulink
+      url="https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSPR">
+      Netscape Portable Runtime</ulink>
+     </para>
+    </listitem>
+   </varlistentry>
+
+   <varlistentry>
+    <term><acronym>NSS</acronym></term>
+    <listitem>
+     <para>
+      <ulink
+      url="https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS">
+      Network Security Services</ulink>
+     </para>
+    </listitem>
+   </varlistentry>
+
    <varlistentry>
     <term><acronym>ODBC</acronym></term>
     <listitem>
@@ -539,6 +561,17 @@
     </listitem>
    </varlistentry>
 
+   <varlistentry>
+    <term><acronym>PKCS#12</acronym></term>
+    <listitem>
+     <para>
+      <ulink
+      url="https://en.wikipedia.org/wiki/PKCS_12">
+      Public-Key Cryptography Standards #12</ulink>
+     </para>
+    </listitem>
+   </varlistentry>
+
    <varlistentry>
     <term><acronym>PL</acronym></term>
     <listitem>
@@ -684,6 +717,16 @@
     </listitem>
    </varlistentry>
 
+   <varlistentry>
+    <term><acronym>TLS</acronym></term>
+    <listitem>
+     <para>
+      <ulink url="https://sv.wikipedia.org/wiki/Transport_Layer_Security">
+      Transport Layer Security</ulink>
+     </para>
+    </listitem>
+   </varlistentry>
+
    <varlistentry>
     <term><acronym>TOAST</acronym></term>
     <listitem>
diff --git a/doc/src/sgml/config.sgml b/doc/src/sgml/config.sgml
index f043433e31..f7ae3b1be1 100644
--- a/doc/src/sgml/config.sgml
+++ b/doc/src/sgml/config.sgml
@@ -1208,6 +1208,23 @@ include_dir 'conf.d'
       </listitem>
      </varlistentry>
 
+     <varlistentry id="guc-ssl-database" xreflabel="ssl_database">
+      <term><varname>ssl_database</varname> (<type>string</type>)
+      <indexterm>
+       <primary><varname>ssl_database</varname> configuration parameter</primary>
+      </indexterm>
+      </term>
+      <listitem>
+       <para>
+        Specifies the name of the file containing the server certificates and
+        keys when using <productname>NSS</productname> for <acronym>SSL</acronym>
+        connections. This parameter can only be set in the
+        <filename>postgresql.conf</filename> file or on the server command
+        line.
+       </para>
+      </listitem>
+     </varlistentry>
+
      <varlistentry id="guc-ssl-ciphers" xreflabel="ssl_ciphers">
       <term><varname>ssl_ciphers</varname> (<type>string</type>)
       <indexterm>
@@ -1224,7 +1241,9 @@ include_dir 'conf.d'
         connections using TLS version 1.2 and lower are affected.  There is
         currently no setting that controls the cipher choices used by TLS
         version 1.3 connections.  The default value is
-        <literal>HIGH:MEDIUM:+3DES:!aNULL</literal>.  The default is usually a
+        <literal>HIGH:MEDIUM:+3DES:!aNULL</literal> for servers which have
+        been built with <productname>OpenSSL</productname> as the
+        <acronym>SSL</acronym> library.  The default is usually a
         reasonable choice unless you have specific security requirements.
        </para>
 
@@ -1426,8 +1445,11 @@ include_dir 'conf.d'
        <para>
         Sets an external command to be invoked when a passphrase for
         decrypting an SSL file such as a private key needs to be obtained.  By
-        default, this parameter is empty, which means the built-in prompting
-        mechanism is used.
+        default, this parameter is empty. When the server is using
+        <productname>OpenSSL</productname>, this means the built-in prompting
+        mechanism is used. When using <productname>NSS</productname>, there is
+        no default prompting so a blank callback will be used returning an
+        empty password.
        </para>
        <para>
         The command must print the passphrase to the standard output and exit
diff --git a/doc/src/sgml/installation.sgml b/doc/src/sgml/installation.sgml
index 0ac1cb9999..bd09124fb0 100644
--- a/doc/src/sgml/installation.sgml
+++ b/doc/src/sgml/installation.sgml
@@ -250,7 +250,7 @@ su - postgres
 
     <listitem>
      <para>
-      You need <productname>OpenSSL</productname>, if you want to support
+      You need a supported <acronym>SSL</acronym> library, if you want to support
       encrypted client connections.  <productname>OpenSSL</productname> is
       also required for random number generation on platforms that do not
       have <filename>/dev/urandom</filename> (except Windows).  The minimum
@@ -966,6 +966,31 @@ build-postgresql:
        </listitem>
       </varlistentry>
 
+      <varlistentry>
+       <term><option>--with-nss</option>
+       <indexterm>
+        <primary>NSS</primary>
+        <secondary>NSPR</secondary>
+        <seealso>SSL</seealso>
+       </indexterm>
+       </term>
+       <listitem>
+        <para>
+         Build with support for <acronym>SSL</acronym> (encrypted)
+         connections using <productname>NSS</productname>. This requires the
+         <productname>NSS</productname> package to be installed. Additionally,
+         <productname>NSS</productname> requires <productname>NSPR</productname>
+         to be installed. <filename>configure</filename> will check for the
+         required header files and libraries to make sure that your
+         <productname>NSS</productname> installation is sufficient before
+         proceeding.
+        </para>
+        <para>
+         This option is incompatible with <literal>--with-openssl</literal>.
+        </para>
+       </listitem>
+      </varlistentry>
+
       <varlistentry>
        <term><option>--with-openssl</option>
        <indexterm>
@@ -982,6 +1007,9 @@ build-postgresql:
          your <productname>OpenSSL</productname> installation is sufficient
          before proceeding.
         </para>
+        <para>
+         This option is incompatible with <literal>--with-nss</literal>.
+        </para>
        </listitem>
       </varlistentry>
 
diff --git a/doc/src/sgml/libpq.sgml b/doc/src/sgml/libpq.sgml
index 9ce32fb39b..61d9082052 100644
--- a/doc/src/sgml/libpq.sgml
+++ b/doc/src/sgml/libpq.sgml
@@ -2459,6 +2459,8 @@ void *PQsslStruct(const PGconn *conn, const char *struct_name);
       </para>
       <para>
        The struct(s) available depend on the SSL implementation in use.
+      </para>
+      <para>
        For <productname>OpenSSL</productname>, there is one struct,
        available under the name "OpenSSL", and it returns a pointer to the
        <productname>OpenSSL</productname> <literal>SSL</literal> struct.
@@ -2482,9 +2484,14 @@ void *PQsslStruct(const PGconn *conn, const char *struct_name);
 ]]></programlisting>
       </para>
       <para>
-       This structure can be used to verify encryption levels, check server
-       certificates, and more. Refer to the <productname>OpenSSL</productname>
-       documentation for information about this structure.
+       For <productname>NSS</productname>, there is one struct available under
+       the name "NSS", and it returns a pointer to the
+       <productname>NSS</productname> <literal>PRFileDesc</literal>.
+      </para>
+      <para>
+       These structures can be used to verify encryption levels, check server
+       certificates, and more. Refer to the <acronym>SSL</acronym> library
+       documentation for information about these structures.
       </para>
      </listitem>
     </varlistentry>
@@ -2511,6 +2518,10 @@ void *PQgetssl(const PGconn *conn);
        <xref linkend="libpq-PQsslInUse"/> instead, and for more details about the
        connection, use <xref linkend="libpq-PQsslAttribute"/>.
       </para>
+      <para>
+       This function returns <literal>NULL</literal> when <acronym>SSL</acronym>
+       librariaes other than <productname>OpenSSL</productname> are used.
+      </para>
      </listitem>
     </varlistentry>
 
@@ -7943,6 +7954,11 @@ void PQinitOpenSSL(int do_ssl, int do_crypto);
        before first opening a database connection.  Also be sure that you
        have done that initialization before opening a database connection.
       </para>
+
+      <para>
+       This function does nothing when using <productname>NSS</productname> as
+       the <acronym>SSL</acronym> library.
+      </para>
      </listitem>
     </varlistentry>
 
@@ -7969,6 +7985,11 @@ void PQinitSSL(int do_ssl);
        might be preferable for applications that need to work with older
        versions of <application>libpq</application>.
       </para>
+
+      <para>
+       This function does nothing when using <productname>NSS</productname> as
+       the <acronym>SSL</acronym> library.
+      </para>
      </listitem>
     </varlistentry>
    </variablelist>
diff --git a/doc/src/sgml/runtime.sgml b/doc/src/sgml/runtime.sgml
index 17e938148c..fe7e305b75 100644
--- a/doc/src/sgml/runtime.sgml
+++ b/doc/src/sgml/runtime.sgml
@@ -2183,15 +2183,21 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
 
   <indexterm zone="ssl-tcp">
    <primary>SSL</primary>
+   <secondary>TLS</secondary>
   </indexterm>
 
   <para>
    <productname>PostgreSQL</productname> has native support for using
    <acronym>SSL</acronym> connections to encrypt client/server communications
    for increased security. This requires that
-   <productname>OpenSSL</productname> is installed on both client and
+   a supported TLS library is installed on both client and
    server systems and that support in <productname>PostgreSQL</productname> is
    enabled at build time (see <xref linkend="installation"/>).
+   Supported libraries are <productname>OpenSSL</productname> and
+   <productname>NSS</productname>. The terms <acronym>SSL</acronym> and
+   <acronym>TLS</acronym> are often used interchangeably to mean a secure
+   connection using a <acronym>TLS</acronym> protocol, even though
+   <acronym>SSL</acronym> protocols are no longer supported.
   </para>
 
   <sect2 id="ssl-setup">
@@ -2211,8 +2217,13 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
   </para>
 
   <para>
-   To start in <acronym>SSL</acronym> mode, files containing the server certificate
-   and private key must exist.  By default, these files are expected to be
+   To start in <acronym>SSL</acronym> mode, a server certificate
+   and private key must exist. The below sections on the different libraries
+   will discuss how to configure these.
+  </para>
+   
+  <para>
+   By default, these files are expected to be
    named <filename>server.crt</filename> and <filename>server.key</filename>, respectively, in
    the server's data directory, but other names and locations can be specified
    using the configuration parameters <xref linkend="guc-ssl-cert-file"/>
@@ -2302,6 +2313,18 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
   </note>
   </sect2>
 
+  <sect2 id="ssl-nss-config">
+   <title>NSS Configuration</title>
+
+  <para>
+   <productname>PostgreSQL</productname> will look for certificates and keys
+   in the <productname>NSS</productname> database specified by the parameter
+   <xref linkend="guc-ssl-database"/> in <filename>postgresql.conf</filename>.
+   The paramaters for certificate and key filenames are used to identify the
+   nicknames in the database.
+  </para>
+  </sect2>
+
   <sect2 id="ssl-client-certificates">
    <title>Using Client Certificates</title>
 
@@ -2376,7 +2399,7 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
   </sect2>
 
   <sect2 id="ssl-server-files">
-   <title>SSL Server File Usage</title>
+   <title>SSL Server File Parameter Usage</title>
 
    <para>
     <xref linkend="ssl-file-usage"/> summarizes the files that are
@@ -2423,6 +2446,14 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
       <entry>client certificate must not be on this list</entry>
      </row>
 
+     <row>
+      <entry><xref linkend="guc-ssl-database"/></entry>
+      <entry>certificate database</entry>
+      <entry>contains server certificates, keys and revocation lists; only
+      used when <productname>PostgreSQL</productname> is built with support
+      for <productname>NSS</productname>.</entry>
+     </row>
+
     </tbody>
    </tgroup>
   </table>
@@ -2550,6 +2581,45 @@ openssl x509 -req -in server.csr -text -days 365 \
    </para>
   </sect2>
 
+  <sect2 id="nss-certificate-database">
+   <title>NSS Certificate Databases</title>
+
+   <para>
+    When using <productname>NSS</productname>, all certificates and keys must
+    be loaded into an <productname>NSS</productname> certificate database.
+   </para>
+
+   <para>
+    To create a new <productname>NSS</productname> certificate database and
+    load the certificates created in <xref linkend="ssl-certificate-creation" />,
+    use the following <productname>NSS</productname> commands:
+<programlisting>
+certutil -d "sql:server.db" -N --empty-password
+certutil -d "sql:server.db" -A -n server.crt -i server.crt -t "CT,C,C"
+certutil -d "sql:server.db" -A -n root.crt -i root.crt -t "CT,C,C"
+</programlisting>
+    This will give the certificate the filename as the nickname identifier in
+    the database which is created as <filename>server.db</filename>.
+   </para>
+   <para>
+    Then load the server key, which require converting it to
+    <acronym>PKCS#12</acronym> format using the
+    <productname>OpenSSL</productname> tools:
+<programlisting>
+openssl pkcs12 -export -out server.pfx -inkey server.key -in server.crt \
+  -certfile root.crt -passout pass:
+pk12util -i server.pfx -d server.db -W ''
+</programlisting>
+   </para>
+   <para>
+    Finally a certificate revocation list can be loaded with the following
+    commands:
+<programlisting>
+crlutil -I -i server.crl -d server.db -B
+</programlisting>
+   </para>
+  </sect2>
+
  </sect1>
 
  <sect1 id="gssapi-enc">
-- 
2.21.1 (Apple Git-122.3)

From 358a594e87ac5cac67d7943832ef7f84459200b8 Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Wed, 28 Oct 2020 11:34:37 +0100
Subject: [PATCH v17 5/5] NSS contrib modules

---
 contrib/Makefile            |   2 +-
 contrib/pgcrypto/Makefile   |   7 +-
 contrib/pgcrypto/nss.c      | 773 ++++++++++++++++++++++++++++++++++++
 contrib/sslinfo/sslinfo.c   |  32 ++
 doc/src/sgml/pgcrypto.sgml  |  38 +-
 doc/src/sgml/sslinfo.sgml   |  12 +-
 src/tools/msvc/Install.pm   |   3 +-
 src/tools/msvc/Mkvcbuild.pm |  12 +-
 8 files changed, 864 insertions(+), 15 deletions(-)
 create mode 100644 contrib/pgcrypto/nss.c

diff --git a/contrib/Makefile b/contrib/Makefile
index 7a4866e338..c2232e5a4d 100644
--- a/contrib/Makefile
+++ b/contrib/Makefile
@@ -52,7 +52,7 @@ SUBDIRS = \
 		unaccent	\
 		vacuumlo
 
-ifeq ($(with_openssl),yes)
+ifneq ($(with_ssl),no)
 SUBDIRS += sslinfo
 else
 ALWAYS_SUBDIRS += sslinfo
diff --git a/contrib/pgcrypto/Makefile b/contrib/pgcrypto/Makefile
index 61eabd2fc0..28b54d321b 100644
--- a/contrib/pgcrypto/Makefile
+++ b/contrib/pgcrypto/Makefile
@@ -7,11 +7,14 @@ INT_TESTS = sha2
 OSSL_SRCS = openssl.c pgp-mpi-openssl.c
 OSSL_TESTS = sha2 des 3des cast5
 
+NSS_SRCS = nss.c pgp-mpi-internal.c imath.c blf.c
+NSS_TESTS = sha2 des 3des
+
 ZLIB_TST = pgp-compression
 ZLIB_OFF_TST = pgp-zlib-DISABLED
 
-CF_SRCS = $(if $(subst no,,$(with_openssl)), $(OSSL_SRCS), $(INT_SRCS))
-CF_TESTS = $(if $(subst no,,$(with_openssl)), $(OSSL_TESTS), $(INT_TESTS))
+CF_SRCS = $(if $(findstring openssl, $(with_ssl)), $(OSSL_SRCS), $(if $(findstring nss, $(with_ssl)), $(NSS_SRCS), $(INT_SRCS)))
+CF_TESTS = $(if $(findstring openssl, $(with_ssl)), $(OSSL_TESTS), $(if $(findstring nss, $(with_ssl)), $(NSS_TESTS), $(INT_TESTS)))
 CF_PGP_TESTS = $(if $(subst no,,$(with_zlib)), $(ZLIB_TST), $(ZLIB_OFF_TST))
 
 SRCS = \
diff --git a/contrib/pgcrypto/nss.c b/contrib/pgcrypto/nss.c
new file mode 100644
index 0000000000..e1291ed403
--- /dev/null
+++ b/contrib/pgcrypto/nss.c
@@ -0,0 +1,773 @@
+/*-------------------------------------------------------------------------
+ *
+ * nss.c
+ *	  Wrapper for using NSS as a backend for pgcrypto PX
+ *
+ *
+ * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ *	  contrib/pgcrypto/nss.c
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#include "postgres.h"
+
+#include "px.h"
+#include "blf.h"
+#include "utils/memutils.h"
+
+/*
+ * BITS_PER_BYTE is also defined in the NSPR header files, so we need to undef
+ * our version to avoid compiler warnings on redefinition.
+ */
+#define pg_BITS_PER_BYTE BITS_PER_BYTE
+#undef BITS_PER_BYTE
+
+#include <nss/nss.h>
+#include <nss/hasht.h>
+#include <nss/pk11func.h>
+#include <nss/pk11pub.h>
+#include <nss/secitem.h>
+#include <nss/sechash.h>
+#include <nss/secoid.h>
+#include <nss/secerr.h>
+
+/*
+ * Ensure that the colliding definitions match, else throw an error. In case
+ * NSPR has removed the definition for some reason, make sure to put ours
+ * back again.
+ */
+#if defined(BITS_PER_BYTE)
+#if BITS_PER_BYTE != pg_BITS_PER_BYTE
+#error "incompatible byte widths between NSPR and postgres"
+#endif
+#else
+#define BITS_PER_BYTE pg_BITS_PER_BYTE
+#endif
+#undef pg_BITS_PER_BYTE
+
+/*
+ * Define our own mechanisms for Blowfish as it's not implemented by NSS.
+ */
+#define BLOWFISH_CBC	(1)
+#define BLOWFISH_ECB	(2)
+
+/*
+ * Data structures for recording cipher implementations as well as ongoing
+ * cipher operations.
+ */
+typedef struct nss_digest
+{
+	NSSInitContext *context;
+	PK11Context *hash_context;
+	HASH_HashType hash_type;
+}			nss_digest;
+
+typedef struct cipher_implementation
+{
+	/* Function pointers to cipher operations */
+	int			(*init) (PX_Cipher *pxc, const uint8 *key, unsigned klen, const uint8 *iv);
+	unsigned	(*get_block_size) (PX_Cipher *pxc);
+	unsigned 	(*get_key_size) (PX_Cipher *pxc);
+	unsigned 	(*get_iv_size) (PX_Cipher *pxc);
+	int			(*encrypt) (PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res);
+	int			(*decrypt) (PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res);
+	void		(*free) (PX_Cipher *pxc);
+
+	/* The mechanism describing the cipher used */
+	union
+	{
+		CK_MECHANISM_TYPE nss;
+		CK_ULONG internal;
+	}			mechanism;
+	int			keylen;
+	bool		is_nss;
+}			cipher_implementation;
+
+typedef struct nss_cipher
+{
+	const cipher_implementation *impl;
+	NSSInitContext *context;
+	PK11Context *crypt_context;
+	SECItem *params;
+
+	PK11SymKey *encrypt_key;
+	PK11SymKey *decrypt_key;
+}			nss_cipher;
+
+typedef struct internal_cipher
+{
+	const cipher_implementation *impl;
+	BlowfishContext	context;
+}			internal_cipher;
+
+typedef struct nss_cipher_ref
+{
+	const char *name;
+	const cipher_implementation *impl;
+} nss_cipher_ref;
+
+/*
+ * Prototypes
+ */
+static unsigned nss_get_iv_size(PX_Cipher *pxc);
+static unsigned nss_get_block_size(PX_Cipher *pxc);
+
+/*
+ * nss_GetHashOidTagByHashType
+ *
+ * Returns the corresponding SECOidTag for the passed hash type. NSS 3.43
+ * includes HASH_GetHashOidTagByHashType for this purpose, but at the time of
+ * writing is not commonly available so we need our own version till then.
+ */
+static SECOidTag
+nss_GetHashOidTagByHashType(HASH_HashType type)
+{
+	if (type == HASH_AlgMD2)
+		return SEC_OID_MD2;
+	if (type == HASH_AlgMD5)
+		return SEC_OID_MD5;
+	if (type == HASH_AlgSHA1)
+		return SEC_OID_SHA1;
+	if (type == HASH_AlgSHA224)
+		return SEC_OID_SHA224;
+	if (type == HASH_AlgSHA256)
+		return SEC_OID_SHA256;
+	if (type == HASH_AlgSHA384)
+		return SEC_OID_SHA384;
+	if (type == HASH_AlgSHA512)
+		return SEC_OID_SHA512;
+
+	return SEC_OID_UNKNOWN;
+}
+
+static unsigned
+nss_digest_block_size(PX_MD *pxmd)
+{
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+	const SECHashObject *object;
+
+	object = HASH_GetHashObject(digest->hash_type);
+	return object->blocklength;
+}
+
+static unsigned
+nss_digest_result_size(PX_MD *pxmd)
+{
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+	const SECHashObject *object;
+
+	object = HASH_GetHashObject(digest->hash_type);
+	return object->length;
+}
+
+static void
+nss_digest_free(PX_MD *pxmd)
+{
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+	PRBool	free_ctx = PR_TRUE;
+
+	PK11_DestroyContext(digest->hash_context, free_ctx);
+	NSS_ShutdownContext(digest->context);
+}
+
+static void
+nss_digest_update(PX_MD *pxmd, const uint8 *data, unsigned dlen)
+{
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+
+	PK11_DigestOp(digest->hash_context, data, dlen);
+}
+
+static void
+nss_digest_reset(PX_MD *pxmd)
+{
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+
+	PK11_DigestBegin(digest->hash_context);
+}
+
+static void
+nss_digest_finish(PX_MD *pxmd, uint8 *dst)
+{
+	unsigned int outlen;
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+	const SECHashObject *object;
+
+	object = HASH_GetHashObject(digest->hash_type);
+	PK11_DigestFinal(digest->hash_context, dst, &outlen, object->length);
+}
+
+int
+px_find_digest(const char *name, PX_MD **res)
+{
+	PX_MD	*pxmd;
+	NSSInitParameters params;
+	NSSInitContext *nss_context;
+	bool found = false;
+	nss_digest *digest;
+	SECStatus status;
+	SECOidData *hash;
+	HASH_HashType t;
+
+	/*
+	 * Initialize our own NSS context without a database backing it.
+	 */
+	memset(&params, 0, sizeof(params));
+	params.length = sizeof(params);
+	nss_context = NSS_InitContext("", "", "", "", &params,
+								  NSS_INIT_READONLY | NSS_INIT_NOCERTDB |
+								  NSS_INIT_NOMODDB | NSS_INIT_FORCEOPEN |
+								  NSS_INIT_NOROOTINIT | NSS_INIT_PK11RELOAD);
+
+	/*
+	 * There is no API function for looking up a digest algorithm from a name
+	 * string, but there is a publically accessible array which can be scanned
+	 * for the name.
+	 */
+	for (t = HASH_AlgNULL + 1; t < HASH_AlgTOTAL; t++)
+	{
+		SECOidTag 	hash_oid;
+		char *p;
+
+		hash_oid = nss_GetHashOidTagByHashType(t);
+
+		if (hash_oid == SEC_OID_UNKNOWN)
+			return PXE_NO_HASH;
+
+		hash = SECOID_FindOIDByTag(hash_oid);
+		if (pg_strcasecmp(hash->desc, name) == 0)
+		{
+			found = true;
+			break;
+		}
+
+		/*
+		 * NSS saves the algorithm names using SHA-xxx notation whereas
+		 * OpenSSL use SHAxxx. To make sure the user finds the requested
+		 * algorithm let's remove the dash and compare that spelling as well.
+		 */
+		if ((p = strchr(hash->desc, '-')) != NULL)
+		{
+			char tmp[12];
+
+			memcpy(tmp, hash->desc, p - hash->desc);
+			memcpy(tmp + (p - hash->desc), p + 1, strlen(hash->desc) - (p - hash->desc) + 1);
+			if (pg_strcasecmp(tmp, name) == 0)
+			{
+				found = true;
+				break;
+			}
+		}
+	}
+
+	if (!found)
+		return PXE_NO_HASH;
+
+	digest = palloc(sizeof(*digest));
+
+	digest->context = nss_context;
+	digest->hash_context = PK11_CreateDigestContext(hash->offset);
+	digest->hash_type = t;
+	if (digest->hash_context == NULL)
+	{
+		pfree(digest);
+		return -1;
+	}
+
+	status = PK11_DigestBegin(digest->hash_context);
+	if (status != SECSuccess)
+	{
+		PK11_DestroyContext(digest->hash_context, PR_TRUE);
+		pfree(digest);
+		return -1;
+	}
+
+	pxmd = palloc(sizeof(*pxmd));
+	pxmd->result_size = nss_digest_result_size;
+	pxmd->block_size = nss_digest_block_size;
+	pxmd->reset = nss_digest_reset;
+	pxmd->update = nss_digest_update;
+	pxmd->finish = nss_digest_finish;
+	pxmd->free = nss_digest_free;
+	pxmd->p.ptr = (void *) digest;
+
+	*res = pxmd;
+
+	return 0;
+}
+
+static int
+bf_init(PX_Cipher *pxc, const uint8 *key, unsigned klen, const uint8 *iv)
+{
+	internal_cipher *cipher = (internal_cipher *) pxc->ptr;
+
+	blowfish_setkey(&cipher->context, key, klen);
+	if (iv)
+		blowfish_setiv(&cipher->context, iv);
+
+	return 0;
+}
+
+static int
+bf_encrypt(PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res)
+{
+	internal_cipher *cipher = (internal_cipher *) pxc->ptr;
+	uint8 *buf;
+
+	if (dlen == 0)
+		return 0;
+
+	if (dlen & 7)
+		return PXE_NOTBLOCKSIZE;
+
+	buf = palloc(dlen);
+	memcpy(buf, data, dlen);
+
+	if (cipher->impl->mechanism.internal == BLOWFISH_ECB)
+		blowfish_encrypt_ecb(buf, dlen, &cipher->context);
+	else
+		blowfish_encrypt_cbc(buf, dlen, &cipher->context);
+
+	memcpy(res, buf, dlen);
+	pfree(buf);
+
+	return 0;
+}
+
+static int
+bf_decrypt(PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res)
+{
+	internal_cipher *cipher = (internal_cipher *) pxc->ptr;
+
+	if (dlen == 0)
+		return 0;
+
+	if (dlen & 7)
+		return PXE_NOTBLOCKSIZE;
+
+	memcpy(res, data, dlen);
+	if (cipher->impl->mechanism.internal == BLOWFISH_ECB)
+		blowfish_decrypt_ecb(res, dlen, &cipher->context);
+	else
+		blowfish_decrypt_cbc(res, dlen, &cipher->context);
+
+	return 0;
+}
+
+static void
+bf_free(PX_Cipher *pxc)
+{
+	internal_cipher *cipher = (internal_cipher *) pxc->ptr;
+
+	pfree(cipher);
+	pfree(pxc);
+}
+
+static int
+nss_symkey_blockcipher_init(PX_Cipher *pxc, const uint8 *key, unsigned klen,
+							const uint8 *iv)
+{
+	nss_cipher	   *cipher = (nss_cipher *) pxc->ptr;
+	SECItem			iv_item;
+	unsigned char  *iv_item_data;
+	SECItem			key_item;
+	int				keylen;
+	PK11SlotInfo   *slot;
+
+	if (cipher->impl->mechanism.nss == CKM_AES_CBC ||
+		cipher->impl->mechanism.nss == CKM_AES_ECB)
+	{
+		if (klen <= 128 / 8)
+			keylen = 128 / 8;
+		else if (klen <= 192 / 8)
+			keylen = 192 / 8;
+		else if (klen <= 256 / 8)
+			keylen = 256 / 8;
+		else
+			return PXE_CIPHER_INIT;
+	}
+	else
+		keylen = cipher->impl->keylen;
+
+	key_item.type = siBuffer;
+	key_item.data = (unsigned char *) key;
+	key_item.len = keylen;
+
+	/*
+	 * If hardware acceleration is configured in NSS one can theoretically get
+	 * a better slot by calling PK11_GetBestSlot() with the mechanism passed
+	 * to it. Unless there are complaints, using the simpler API will make
+	 * error handling easier though.
+	 */
+	slot = PK11_GetInternalSlot();
+	if (!slot)
+		return PXE_CIPHER_INIT;
+
+	/*
+	 * The key must be set up for the operation, and since we don't know at
+	 * this point whether we are asked to encrypt or decrypt we need to store
+	 * both versions.
+	 */
+	cipher->decrypt_key = PK11_ImportSymKey(slot, cipher->impl->mechanism.nss,
+											PK11_OriginUnwrap,
+											CKA_DECRYPT, &key_item,
+											NULL);
+	cipher->encrypt_key = PK11_ImportSymKey(slot, cipher->impl->mechanism.nss,
+											PK11_OriginUnwrap,
+											CKA_ENCRYPT, &key_item,
+											NULL);
+	PK11_FreeSlot(slot);
+
+	if (!cipher->decrypt_key || !cipher->encrypt_key)
+		return PXE_CIPHER_INIT;
+
+	if (iv)
+	{
+		iv_item.type = siBuffer;
+		iv_item.data = (unsigned char *) iv;
+		iv_item.len = nss_get_iv_size(pxc);
+	}
+	else
+	{
+		/*
+		 * The documentation states that either passing .data = 0; .len = 0;
+		 * in the iv_item, or NULL as iv_item, to PK11_ParamFromIV should be
+		 * done when IV is missing. That however leads to segfaults in the
+		 * library, the workaround that works in modern  library versions is
+		 * to pass in a keysized zeroed out IV.
+		 */
+		iv_item_data = palloc0(nss_get_iv_size(pxc));
+		iv_item.type = siBuffer;
+		iv_item.data = iv_item_data;
+		iv_item.len = nss_get_iv_size(pxc);
+	}
+
+	cipher->params = PK11_ParamFromIV(cipher->impl->mechanism.nss, &iv_item);
+
+	/* If we had to make a mock IV, free it once made into a param */
+	if (!iv)
+		pfree(iv_item_data);
+
+	if (cipher->params == NULL)
+		return PXE_CIPHER_INIT;
+
+	return 0;
+}
+
+static int
+nss_decrypt(PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res)
+{
+	nss_cipher *cipher = (nss_cipher *) pxc->ptr;
+	SECStatus	status;
+	int outlen;
+
+	if (!cipher->crypt_context)
+	{
+		cipher->crypt_context =
+			PK11_CreateContextBySymKey(cipher->impl->mechanism.nss, CKA_DECRYPT,
+									   cipher->decrypt_key, cipher->params);
+	}
+
+	status = PK11_CipherOp(cipher->crypt_context, res, &outlen, dlen, data, dlen);
+	if (status != SECSuccess)
+		return PXE_DECRYPT_FAILED;
+
+	return 0;
+}
+
+static int
+nss_encrypt(PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res)
+{
+	nss_cipher *cipher = (nss_cipher *) pxc->ptr;
+	SECStatus	status;
+	int outlen;
+
+	if (!cipher->crypt_context)
+	{
+		cipher->crypt_context =
+			PK11_CreateContextBySymKey(cipher->impl->mechanism.nss, CKA_ENCRYPT,
+									   cipher->decrypt_key, cipher->params);
+	}
+
+	status = PK11_CipherOp(cipher->crypt_context, res, &outlen, dlen, data, dlen);
+
+	if (status != SECSuccess)
+		return PXE_DECRYPT_FAILED;
+
+	return 0;
+}
+
+static void
+nss_free(PX_Cipher *pxc)
+{
+	nss_cipher *cipher = pxc->ptr;
+	PRBool		free_ctx = PR_TRUE;
+
+	PK11_FreeSymKey(cipher->encrypt_key);
+	PK11_FreeSymKey(cipher->decrypt_key);
+	PK11_DestroyContext(cipher->crypt_context, free_ctx);
+	NSS_ShutdownContext(cipher->context);
+	pfree(cipher);
+
+	pfree(pxc);
+}
+
+static unsigned
+nss_get_block_size(PX_Cipher *pxc)
+{
+	nss_cipher *cipher = pxc->ptr;
+
+	return PK11_GetBlockSize(cipher->impl->mechanism.nss, NULL);
+}
+
+static unsigned
+nss_get_key_size(PX_Cipher *pxc)
+{
+	nss_cipher *cipher = pxc->ptr;
+
+	return cipher->impl->keylen;
+}
+
+static unsigned
+nss_get_iv_size(PX_Cipher *pxc)
+{
+	nss_cipher *cipher = pxc->ptr;
+
+	return PK11_GetIVLength(cipher->impl->mechanism.nss);
+}
+
+static unsigned
+bf_get_block_size(PX_Cipher *pxc)
+{
+	return 8;
+}
+
+static unsigned
+bf_get_key_size(PX_Cipher *pxc)
+{
+	return 448 / 8;
+}
+
+static unsigned
+bf_get_iv_size(PX_Cipher *pxc)
+{
+	return 8;
+}
+
+/*
+ * Cipher Implementations
+ */
+static const cipher_implementation nss_des_cbc = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_DES_CBC,
+	.keylen = 8,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_des_ecb = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_DES_ECB,
+	.keylen = 8,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_des3_cbc = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_DES3_CBC,
+	.keylen = 24,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_des3_ecb = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_DES3_ECB,
+	.keylen = 24,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_aes_cbc = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_AES_CBC,
+	.keylen = 32,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_aes_ecb = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_AES_ECB,
+	.keylen = 32,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_bf_ecb = {
+	.init = bf_init,
+	.get_block_size = bf_get_block_size,
+	.get_key_size = bf_get_key_size,
+	.get_iv_size = bf_get_iv_size,
+	.encrypt = bf_encrypt,
+	.decrypt = bf_decrypt,
+	.free = bf_free,
+	.mechanism.internal = BLOWFISH_ECB,
+	.keylen = 56,
+	.is_nss = false
+};
+
+static const cipher_implementation nss_bf_cbc = {
+	.init = bf_init,
+	.get_block_size = bf_get_block_size,
+	.get_key_size = bf_get_key_size,
+	.get_iv_size = bf_get_iv_size,
+	.encrypt = bf_encrypt,
+	.decrypt = bf_decrypt,
+	.free = bf_free,
+	.mechanism.internal = BLOWFISH_CBC,
+	.keylen = 56,
+	.is_nss = false
+};
+
+/*
+ * Lookup table for finding the implementation based on a name. CAST5 as well
+ * as BLOWFISH are defined as cipher mechanisms in NSS but error out with
+ * SEC_ERROR_INVALID_ALGORITHM. Blowfish is implemented using the internal
+ * implementation while CAST5 isn't supported at all at this time,
+ */
+static const nss_cipher_ref nss_cipher_lookup[] = {
+	{"des", &nss_des_cbc},
+	{"des-cbc", &nss_des_cbc},
+	{"des-ecb", &nss_des_ecb},
+	{"des3-cbc", &nss_des3_cbc},
+	{"3des", &nss_des3_cbc},
+	{"3des-cbc", &nss_des3_cbc},
+	{"des3-ecb", &nss_des3_ecb},
+	{"3des-ecb", &nss_des3_ecb},
+	{"aes", &nss_aes_cbc},
+	{"aes-cbc", &nss_aes_cbc},
+	{"aes-ecb", &nss_aes_ecb},
+	{"rijndael", &nss_aes_cbc},
+	{"rijndael-cbc", &nss_aes_cbc},
+	{"rijndael-ecb", &nss_aes_ecb},
+	{"blowfish", &nss_bf_cbc},
+	{"blowfish-cbc", &nss_bf_cbc},
+	{"blowfish-ecb", &nss_bf_ecb},
+	{"bf", &nss_bf_cbc},
+	{"bf-cbc", &nss_bf_cbc},
+	{"bf-ecb", &nss_bf_ecb},
+	{NULL}
+};
+
+/*
+ * px_find_cipher
+ *
+ * Search for the requested cipher and see if there is support for it, and if
+ * so return an allocated object containing the playbook for how to encrypt
+ * and decrypt using the cipher.
+ */
+int
+px_find_cipher(const char *alias, PX_Cipher **res)
+{
+	const nss_cipher_ref *cipher_ref;
+	PX_Cipher  *px_cipher;
+	NSSInitParameters params;
+	NSSInitContext *nss_context;
+	nss_cipher	*cipher;
+	internal_cipher *int_cipher;
+
+	for (cipher_ref = nss_cipher_lookup; cipher_ref->name; cipher_ref++)
+	{
+		if (strcmp(cipher_ref->name, alias) == 0)
+			break;
+	}
+
+	if (!cipher_ref->name)
+		return PXE_NO_CIPHER;
+
+	/*
+	 * Fill in the PX_Cipher to pass back to PX describing the operations to
+	 * perform in order to use the cipher.
+	 */
+	px_cipher = palloc(sizeof(*px_cipher));
+	px_cipher->block_size = cipher_ref->impl->get_block_size;
+	px_cipher->key_size = cipher_ref->impl->get_key_size;
+	px_cipher->iv_size = cipher_ref->impl->get_iv_size;
+	px_cipher->free = cipher_ref->impl->free;
+	px_cipher->init = cipher_ref->impl->init;
+	px_cipher->encrypt = cipher_ref->impl->encrypt;
+	px_cipher->decrypt = cipher_ref->impl->decrypt;
+
+	/*
+	 * Set the private data, which is different for NSS and internal ciphers
+	 */
+	if (cipher_ref->impl->is_nss)
+	{
+		/*
+		 * Initialize our own NSS context without a database backing it. At
+		 * some point we might want to allow users to use stored keys in the
+		 * database rather than passing them via SELECT encrypt(), and then
+		 * this need to be changed to open a user specified database.
+		 */
+		memset(&params, 0, sizeof(params));
+		params.length = sizeof(params);
+		nss_context = NSS_InitContext("", "", "", "", &params,
+									  NSS_INIT_READONLY | NSS_INIT_NOCERTDB |
+									  NSS_INIT_NOMODDB | NSS_INIT_FORCEOPEN |
+									  NSS_INIT_NOROOTINIT | NSS_INIT_PK11RELOAD);
+
+		/* nss_cipher is the private state struct for the operation */
+		cipher = palloc(sizeof(*cipher));
+		cipher->context = nss_context;
+		cipher->impl = cipher_ref->impl;
+		cipher->crypt_context = NULL;
+
+		px_cipher->ptr = cipher;
+	}
+	else
+	{
+		int_cipher = palloc0(sizeof(*int_cipher));
+
+		int_cipher->impl = cipher_ref->impl;
+		px_cipher->ptr = int_cipher;
+	}
+
+	*res = px_cipher;
+	return 0;
+}
diff --git a/contrib/sslinfo/sslinfo.c b/contrib/sslinfo/sslinfo.c
index 30cae0bb98..3aadd90aa6 100644
--- a/contrib/sslinfo/sslinfo.c
+++ b/contrib/sslinfo/sslinfo.c
@@ -9,9 +9,11 @@
 
 #include "postgres.h"
 
+#ifdef USE_OPENSSL
 #include <openssl/x509.h>
 #include <openssl/x509v3.h>
 #include <openssl/asn1.h>
+#endif
 
 #include "access/htup_details.h"
 #include "funcapi.h"
@@ -21,6 +23,7 @@
 
 PG_MODULE_MAGIC;
 
+#ifdef USE_OPENSSL
 static Datum X509_NAME_field_to_text(X509_NAME *name, text *fieldName);
 static Datum ASN1_STRING_to_text(ASN1_STRING *str);
 
@@ -31,6 +34,7 @@ typedef struct
 {
 	TupleDesc	tupdesc;
 } SSLExtensionInfoContext;
+#endif
 
 /*
  * Indicates whether current session uses SSL
@@ -131,6 +135,7 @@ ssl_client_serial(PG_FUNCTION_ARGS)
 }
 
 
+#ifdef USE_OPENSSL
 /*
  * Converts OpenSSL ASN1_STRING structure into text
  *
@@ -282,7 +287,23 @@ ssl_issuer_field(PG_FUNCTION_ARGS)
 	else
 		return result;
 }
+#endif							/* USE_OPENSSL */
 
+#ifdef USE_NSS
+PG_FUNCTION_INFO_V1(ssl_client_dn_field);
+Datum
+ssl_client_dn_field(PG_FUNCTION_ARGS)
+{
+	PG_RETURN_NULL();
+}
+
+PG_FUNCTION_INFO_V1(ssl_issuer_field);
+Datum
+ssl_issuer_field(PG_FUNCTION_ARGS)
+{
+	PG_RETURN_NULL();
+}
+#endif							/* USE_NSS */
 
 /*
  * Returns current client certificate subject as one string
@@ -338,6 +359,7 @@ ssl_issuer_dn(PG_FUNCTION_ARGS)
 }
 
 
+#ifdef USE_OPENSSL
 /*
  * Returns information about available SSL extensions.
  *
@@ -471,3 +493,13 @@ ssl_extension_info(PG_FUNCTION_ARGS)
 	/* All done */
 	SRF_RETURN_DONE(funcctx);
 }
+#endif							/* USE_OPENSSL */
+
+#ifdef USE_NSS
+PG_FUNCTION_INFO_V1(ssl_extension_info);
+Datum
+ssl_extension_info(PG_FUNCTION_ARGS)
+{
+	PG_RETURN_NULL();
+}
+#endif							/* USE_NSS */
diff --git a/doc/src/sgml/pgcrypto.sgml b/doc/src/sgml/pgcrypto.sgml
index 8748c64e2d..f03e1f5fcf 100644
--- a/doc/src/sgml/pgcrypto.sgml
+++ b/doc/src/sgml/pgcrypto.sgml
@@ -45,8 +45,9 @@ digest(data bytea, type text) returns bytea
     <literal>sha224</literal>, <literal>sha256</literal>,
     <literal>sha384</literal> and <literal>sha512</literal>.
     If <filename>pgcrypto</filename> was built with
-    <productname>OpenSSL</productname>, more algorithms are available, as
-    detailed in <xref linkend="pgcrypto-with-without-openssl"/>.
+    <productname>OpenSSL</productname> or <productname>NSS</productname>,
+    more algorithms are available, as
+    detailed in <xref linkend="pgcrypto-with-without-openssl-nss"/>.
    </para>
 
    <para>
@@ -763,7 +764,7 @@ pgp_sym_encrypt(data, psw, 'compress-algo=1, cipher-algo=aes256')
     Which cipher algorithm to use.
    </para>
 <literallayout>
-Values: bf, aes128, aes192, aes256 (OpenSSL-only: <literal>3des</literal>, <literal>cast5</literal>)
+Values: bf, aes128, aes192, aes256 (OpenSSL-only: <literal>3des</literal>, <literal>cast5</literal>; NSS-only: <literal>3des</literal>)
 Default: aes128
 Applies to: pgp_sym_encrypt, pgp_pub_encrypt
 </literallayout>
@@ -1152,8 +1153,8 @@ gen_random_uuid() returns uuid
    <para>
     <filename>pgcrypto</filename> configures itself according to the findings of the
     main PostgreSQL <literal>configure</literal> script.  The options that
-    affect it are <literal>--with-zlib</literal> and
-    <literal>--with-openssl</literal>.
+    affect it are <literal>--with-zlib</literal>,
+    <literal>--with-openssl</literal> and <literal>--with-nss</literal>.
    </para>
 
    <para>
@@ -1168,14 +1169,16 @@ gen_random_uuid() returns uuid
     BIGNUM functions.
    </para>
 
-   <table id="pgcrypto-with-without-openssl">
-    <title>Summary of Functionality with and without OpenSSL</title>
-    <tgroup cols="3">
+   <table id="pgcrypto-with-without-openssl-nss">
+    <title>Summary of Functionality with and without external cryptographic
+      library</title>
+    <tgroup cols="4">
      <thead>
       <row>
        <entry>Functionality</entry>
        <entry>Built-in</entry>
        <entry>With OpenSSL</entry>
+       <entry>With NSS</entry>
       </row>
      </thead>
      <tbody>
@@ -1183,51 +1186,67 @@ gen_random_uuid() returns uuid
        <entry>MD5</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>SHA1</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>SHA224/256/384/512</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>Other digest algorithms</entry>
        <entry>no</entry>
        <entry>yes (Note 1)</entry>
+       <entry>yes (Note 1)</entry>
       </row>
       <row>
        <entry>Blowfish</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>AES</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>DES/3DES/CAST5</entry>
        <entry>no</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
+      </row>
+      <row>
+       <entry>CAST5</entry>
+       <entry>no</entry>
+       <entry>yes</entry>
+       <entry>no</entry>
       </row>
       <row>
        <entry>Raw encryption</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>PGP Symmetric encryption</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>PGP Public-Key encryption</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
      </tbody>
     </tgroup>
@@ -1240,7 +1259,8 @@ gen_random_uuid() returns uuid
    <orderedlist>
     <listitem>
      <para>
-      Any digest algorithm <productname>OpenSSL</productname> supports
+      Any digest algorithm <productname>OpenSSL</productname> and
+      <productname>NSS</productname> supports
       is automatically picked up.
       This is not possible with ciphers, which need to be supported
       explicitly.
diff --git a/doc/src/sgml/sslinfo.sgml b/doc/src/sgml/sslinfo.sgml
index 3213c039ca..d2270cbe7c 100644
--- a/doc/src/sgml/sslinfo.sgml
+++ b/doc/src/sgml/sslinfo.sgml
@@ -22,7 +22,8 @@
 
  <para>
   This extension won't build at all unless the installation was
-  configured with <literal>--with-openssl</literal>.
+  configured with SSL support, such as <literal>--with-openssl</literal>
+  or <literal>--with-nss</literal>.
  </para>
 
  <sect2>
@@ -208,6 +209,9 @@ emailAddress
      the X.500 and X.509 standards, so you cannot just assign arbitrary
      meaning to them.
     </para>
+    <para>
+     This function is only available when using <productname>OpenSSL</productname>.
+    </para>
     </listitem>
    </varlistentry>
 
@@ -223,6 +227,9 @@ emailAddress
      Same as <function>ssl_client_dn_field</function>, but for the certificate issuer
      rather than the certificate subject.
     </para>
+    <para>
+     This function is only available when using <productname>OpenSSL</productname>.
+    </para>
     </listitem>
    </varlistentry>
 
@@ -238,6 +245,9 @@ emailAddress
      Provide information about extensions of client certificate: extension name,
      extension value, and if it is a critical extension.
     </para>
+    <para>
+     This function is only available when using <productname>OpenSSL</productname>.
+    </para>
     </listitem>
    </varlistentry>
   </variablelist>
diff --git a/src/tools/msvc/Install.pm b/src/tools/msvc/Install.pm
index ea3af48777..afe72a7e97 100644
--- a/src/tools/msvc/Install.pm
+++ b/src/tools/msvc/Install.pm
@@ -438,7 +438,8 @@ sub CopyContribFiles
 		{
 			# These configuration-based exclusions must match vcregress.pl
 			next if ($d eq "uuid-ossp"  && !defined($config->{uuid}));
-			next if ($d eq "sslinfo"    && !defined($config->{openssl}));
+			next if ($d eq "sslinfo"    && !defined($config->{openssl})
+			  && !defined($config->{nss}));
 			next if ($d eq "xml2"       && !defined($config->{xml}));
 			next if ($d =~ /_plperl$/   && !defined($config->{perl}));
 			next if ($d =~ /_plpython$/ && !defined($config->{python}));
diff --git a/src/tools/msvc/Mkvcbuild.pm b/src/tools/msvc/Mkvcbuild.pm
index 29879b51af..379f861a56 100644
--- a/src/tools/msvc/Mkvcbuild.pm
+++ b/src/tools/msvc/Mkvcbuild.pm
@@ -442,9 +442,14 @@ sub mkvcbuild
 		push @contrib_excludes, 'xml2';
 	}
 
+	if (!$solution->{options}->{openssl} && !$solution->{options}->{nss})
+	{
+		push @contrib_excludes, 'sslinfo';
+	}
+
 	if (!$solution->{options}->{openssl})
 	{
-		push @contrib_excludes, 'sslinfo', 'ssl_passphrase_callback';
+		push @contrib_excludes, 'ssl_passphrase_callback';
 	}
 
 	if (!$solution->{options}->{uuid})
@@ -474,6 +479,11 @@ sub mkvcbuild
 		$pgcrypto->AddFiles('contrib/pgcrypto', 'openssl.c',
 			'pgp-mpi-openssl.c');
 	}
+	elsif ($solution->{options}->{nss})
+	{
+		$pgcrypto->AddFiles('contrib/pgcrypto', 'nss.c',
+			'pgp-mpi-internal.c', 'imath.c', 'blf.c');
+	}
 	else
 	{
 		$pgcrypto->AddFiles(
-- 
2.21.1 (Apple Git-122.3)

From 0d9f8f0427880c489890bbef813bd012b9c438c5 Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Wed, 28 Oct 2020 11:18:42 +0100
Subject: [PATCH v18 1/5] NSS Frontend, Backend and build infrastructure

TODO:
	* SCRAM channel binding is implemented but doesn't work
	* Frontend CRL configuration handling
	* Settle on a required version in autoconf
	* Move pg_nss.h to a .c file for both frontend and backend
---
 configure                                     |  401 +++++-
 configure.ac                                  |   60 +-
 .../postgres_fdw/expected/postgres_fdw.out    |    2 +-
 src/Makefile.global.in                        |    2 +-
 src/backend/libpq/Makefile                    |    6 +-
 src/backend/libpq/auth.c                      |    7 +
 src/backend/libpq/be-secure-nss.c             | 1193 +++++++++++++++++
 src/backend/libpq/be-secure.c                 |    3 +
 src/backend/libpq/hba.c                       |    2 +-
 src/backend/utils/misc/guc.c                  |   20 +-
 src/common/Makefile                           |    2 +-
 src/include/common/pg_nss.h                   |  175 +++
 src/include/libpq/libpq-be.h                  |   15 +-
 src/include/libpq/libpq.h                     |    3 +
 src/include/pg_config.h.in                    |    3 +
 src/include/pg_config_manual.h                |    5 +-
 src/interfaces/libpq/Makefile                 |   13 +-
 src/interfaces/libpq/fe-connect.c             |    4 +
 src/interfaces/libpq/fe-secure-nss.c          | 1081 +++++++++++++++
 src/interfaces/libpq/fe-secure.c              |    5 +-
 src/interfaces/libpq/libpq-fe.h               |   11 +
 src/interfaces/libpq/libpq-int.h              |   18 +-
 src/tools/msvc/Mkvcbuild.pm                   |   22 +-
 src/tools/msvc/Solution.pm                    |   20 +
 src/tools/msvc/config_default.pl              |    1 +
 25 files changed, 3001 insertions(+), 73 deletions(-)
 create mode 100644 src/backend/libpq/be-secure-nss.c
 create mode 100644 src/include/common/pg_nss.h
 create mode 100644 src/interfaces/libpq/fe-secure-nss.c

diff --git a/configure b/configure
index ace4ed5dec..d99ec29c6a 100755
--- a/configure
+++ b/configure
@@ -654,6 +654,9 @@ LIBOBJS
 UUID_LIBS
 LDAP_LIBS_BE
 LDAP_LIBS_FE
+with_ssl
+NSPR_CONFIG
+NSS_CONFIG
 PTHREAD_CFLAGS
 PTHREAD_LIBS
 PTHREAD_CC
@@ -711,7 +714,6 @@ with_uuid
 with_readline
 with_systemd
 with_selinux
-with_openssl
 with_ldap
 with_krb_srvnam
 krb_srvtab
@@ -856,7 +858,6 @@ with_pam
 with_bsd_auth
 with_ldap
 with_bonjour
-with_openssl
 with_selinux
 with_systemd
 with_readline
@@ -868,6 +869,8 @@ with_libxslt
 with_system_tzdata
 with_zlib
 with_gnu_ld
+with_ssl
+with_openssl
 enable_largefile
 '
       ac_precious_vars='build_alias
@@ -1558,7 +1561,6 @@ Optional Packages:
   --with-bsd-auth         build with BSD Authentication support
   --with-ldap             build with LDAP support
   --with-bonjour          build with Bonjour support
-  --with-openssl          build with OpenSSL support
   --with-selinux          build with SELinux support
   --with-systemd          build with systemd support
   --without-readline      do not use GNU Readline nor BSD Libedit for editing
@@ -1572,6 +1574,8 @@ Optional Packages:
                           use system time zone data in DIR
   --without-zlib          do not use Zlib
   --with-gnu-ld           assume the C compiler uses GNU ld [default=no]
+  --with-ssl=LIB          use LIB for SSL/TLS support (openssl, nss)
+  --with-openssl          obsolete spelling of --with-ssl=openssl
 
 Some influential environment variables:
   CC          C compiler command
@@ -8071,41 +8075,6 @@ fi
 $as_echo "$with_bonjour" >&6; }
 
 
-#
-# OpenSSL
-#
-{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether to build with OpenSSL support" >&5
-$as_echo_n "checking whether to build with OpenSSL support... " >&6; }
-
-
-
-# Check whether --with-openssl was given.
-if test "${with_openssl+set}" = set; then :
-  withval=$with_openssl;
-  case $withval in
-    yes)
-
-$as_echo "#define USE_OPENSSL 1" >>confdefs.h
-
-      ;;
-    no)
-      :
-      ;;
-    *)
-      as_fn_error $? "no argument expected for --with-openssl option" "$LINENO" 5
-      ;;
-  esac
-
-else
-  with_openssl=no
-
-fi
-
-
-{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $with_openssl" >&5
-$as_echo "$with_openssl" >&6; }
-
-
 #
 # SELinux
 #
@@ -12179,7 +12148,64 @@ fi
   fi
 fi
 
+#
+# SSL Library
+#
+# There are currently two supported SSL/TLS libraries, OpenSSL and NSS.
+#
+
+
+
+# Check whether --with-ssl was given.
+if test "${with_ssl+set}" = set; then :
+  withval=$with_ssl;
+  case $withval in
+    yes)
+      as_fn_error $? "argument required for --with-ssl option" "$LINENO" 5
+      ;;
+    no)
+      as_fn_error $? "argument required for --with-ssl option" "$LINENO" 5
+      ;;
+    *)
+
+      ;;
+  esac
+
+fi
+
+
+if test x"$with_ssl" = x"" ; then
+  with_ssl=no
+fi
+
+
+
+# Check whether --with-openssl was given.
+if test "${with_openssl+set}" = set; then :
+  withval=$with_openssl;
+  case $withval in
+    yes)
+      :
+      ;;
+    no)
+      :
+      ;;
+    *)
+      as_fn_error $? "no argument expected for --with-openssl option" "$LINENO" 5
+      ;;
+  esac
+
+else
+  with_openssl=no
+
+fi
+
+
 if test "$with_openssl" = yes ; then
+  with_ssl=openssl
+fi
+
+if test "$with_ssl" = openssl ; then
     # Minimum required OpenSSL version is 1.0.1
 
 $as_echo "#define OPENSSL_API_COMPAT 0x10001000L" >>confdefs.h
@@ -12440,8 +12466,280 @@ _ACEOF
 fi
 done
 
+
+$as_echo "#define USE_OPENSSL 1" >>confdefs.h
+
+elif test "$with_ssl" = nss ; then
+  # TODO: fallback in case nss-config/nspr-config aren't found.
+  if test -z "$NSS_CONFIG"; then
+  for ac_prog in nss-config
+do
+  # Extract the first word of "$ac_prog", so it can be a program name with args.
+set dummy $ac_prog; ac_word=$2
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
+$as_echo_n "checking for $ac_word... " >&6; }
+if ${ac_cv_path_NSS_CONFIG+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  case $NSS_CONFIG in
+  [\\/]* | ?:[\\/]*)
+  ac_cv_path_NSS_CONFIG="$NSS_CONFIG" # Let the user override the test with a path.
+  ;;
+  *)
+  as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH
+do
+  IFS=$as_save_IFS
+  test -z "$as_dir" && as_dir=.
+    for ac_exec_ext in '' $ac_executable_extensions; do
+  if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
+    ac_cv_path_NSS_CONFIG="$as_dir/$ac_word$ac_exec_ext"
+    $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
+    break 2
+  fi
+done
+  done
+IFS=$as_save_IFS
+
+  ;;
+esac
+fi
+NSS_CONFIG=$ac_cv_path_NSS_CONFIG
+if test -n "$NSS_CONFIG"; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $NSS_CONFIG" >&5
+$as_echo "$NSS_CONFIG" >&6; }
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
 fi
 
+
+  test -n "$NSS_CONFIG" && break
+done
+
+else
+  # Report the value of NSS_CONFIG in configure's output in all cases.
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for NSS_CONFIG" >&5
+$as_echo_n "checking for NSS_CONFIG... " >&6; }
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $NSS_CONFIG" >&5
+$as_echo "$NSS_CONFIG" >&6; }
+fi
+
+  if test -z "$NSPR_CONFIG"; then
+  for ac_prog in nspr-config
+do
+  # Extract the first word of "$ac_prog", so it can be a program name with args.
+set dummy $ac_prog; ac_word=$2
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
+$as_echo_n "checking for $ac_word... " >&6; }
+if ${ac_cv_path_NSPR_CONFIG+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  case $NSPR_CONFIG in
+  [\\/]* | ?:[\\/]*)
+  ac_cv_path_NSPR_CONFIG="$NSPR_CONFIG" # Let the user override the test with a path.
+  ;;
+  *)
+  as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH
+do
+  IFS=$as_save_IFS
+  test -z "$as_dir" && as_dir=.
+    for ac_exec_ext in '' $ac_executable_extensions; do
+  if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
+    ac_cv_path_NSPR_CONFIG="$as_dir/$ac_word$ac_exec_ext"
+    $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
+    break 2
+  fi
+done
+  done
+IFS=$as_save_IFS
+
+  ;;
+esac
+fi
+NSPR_CONFIG=$ac_cv_path_NSPR_CONFIG
+if test -n "$NSPR_CONFIG"; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $NSPR_CONFIG" >&5
+$as_echo "$NSPR_CONFIG" >&6; }
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+fi
+
+
+  test -n "$NSPR_CONFIG" && break
+done
+
+else
+  # Report the value of NSPR_CONFIG in configure's output in all cases.
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for NSPR_CONFIG" >&5
+$as_echo_n "checking for NSPR_CONFIG... " >&6; }
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $NSPR_CONFIG" >&5
+$as_echo "$NSPR_CONFIG" >&6; }
+fi
+
+  if test -n "$NSS_CONFIG"; then
+    NSS_LIBS=`$NSS_CONFIG --libs`
+	NSS_CFLAGS=`$NSS_CONFIG --cflags`
+  fi
+  if test -n "$NSPR_CONFIG"; then
+	NSPR_LIBS=`$NSPR_CONFIG --libs`
+	NSPR_CFLAGS=`$NSPR_CONFIG --cflags`
+  fi
+
+  LDFLAGS="$LDFLAGS $NSS_LIBS $NSPR_LIBS"
+  CFLAGS="$CFLAGS $NSS_CFLAGS $NSPR_CFLAGS"
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for NSS_InitContext in -lnss3" >&5
+$as_echo_n "checking for NSS_InitContext in -lnss3... " >&6; }
+if ${ac_cv_lib_nss3_NSS_InitContext+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lnss3  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char NSS_InitContext ();
+int
+main ()
+{
+return NSS_InitContext ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_lib_nss3_NSS_InitContext=yes
+else
+  ac_cv_lib_nss3_NSS_InitContext=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_nss3_NSS_InitContext" >&5
+$as_echo "$ac_cv_lib_nss3_NSS_InitContext" >&6; }
+if test "x$ac_cv_lib_nss3_NSS_InitContext" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_LIBNSS3 1
+_ACEOF
+
+  LIBS="-lnss3 $LIBS"
+
+else
+  as_fn_error $? "library 'nss3' is required for NSS" "$LINENO" 5
+fi
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for PR_GetDefaultIOMethods in -lnspr4" >&5
+$as_echo_n "checking for PR_GetDefaultIOMethods in -lnspr4... " >&6; }
+if ${ac_cv_lib_nspr4_PR_GetDefaultIOMethods+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lnspr4  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char PR_GetDefaultIOMethods ();
+int
+main ()
+{
+return PR_GetDefaultIOMethods ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_lib_nspr4_PR_GetDefaultIOMethods=yes
+else
+  ac_cv_lib_nspr4_PR_GetDefaultIOMethods=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_nspr4_PR_GetDefaultIOMethods" >&5
+$as_echo "$ac_cv_lib_nspr4_PR_GetDefaultIOMethods" >&6; }
+if test "x$ac_cv_lib_nspr4_PR_GetDefaultIOMethods" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_LIBNSPR4 1
+_ACEOF
+
+  LIBS="-lnspr4 $LIBS"
+
+else
+  as_fn_error $? "library 'nspr4' is required for NSS" "$LINENO" 5
+fi
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for SSL_GetImplementedCiphers in -lssl3" >&5
+$as_echo_n "checking for SSL_GetImplementedCiphers in -lssl3... " >&6; }
+if ${ac_cv_lib_ssl3_SSL_GetImplementedCiphers+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lssl3  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char SSL_GetImplementedCiphers ();
+int
+main ()
+{
+return SSL_GetImplementedCiphers ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_lib_ssl3_SSL_GetImplementedCiphers=yes
+else
+  ac_cv_lib_ssl3_SSL_GetImplementedCiphers=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_ssl3_SSL_GetImplementedCiphers" >&5
+$as_echo "$ac_cv_lib_ssl3_SSL_GetImplementedCiphers" >&6; }
+if test "x$ac_cv_lib_ssl3_SSL_GetImplementedCiphers" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_LIBSSL3 1
+_ACEOF
+
+  LIBS="-lssl3 $LIBS"
+
+else
+  as_fn_error $? "library 'ssl3' is required for NSS" "$LINENO" 5
+fi
+
+
+$as_echo "#define USE_NSS 1" >>confdefs.h
+
+elif test "$with_ssl" != no ; then
+  as_fn_error $? "--with-ssl must specify one of openssl or nss" "$LINENO" 5
+fi
+
+
 if test "$with_pam" = yes ; then
   { $as_echo "$as_me:${as_lineno-$LINENO}: checking for pam_start in -lpam" >&5
 $as_echo_n "checking for pam_start in -lpam... " >&6; }
@@ -13327,7 +13625,7 @@ done
 
 fi
 
-if test "$with_openssl" = yes ; then
+if test "$with_ssl" = openssl ; then
   ac_fn_c_check_header_mongrel "$LINENO" "openssl/ssl.h" "ac_cv_header_openssl_ssl_h" "$ac_includes_default"
 if test "x$ac_cv_header_openssl_ssl_h" = xyes; then :
 
@@ -13344,6 +13642,25 @@ else
 fi
 
 
+fi
+
+if test "$with_ssl" = nss ; then
+  ac_fn_c_check_header_mongrel "$LINENO" "nss/ssl.h" "ac_cv_header_nss_ssl_h" "$ac_includes_default"
+if test "x$ac_cv_header_nss_ssl_h" = xyes; then :
+
+else
+  as_fn_error $? "header file <nss/ssl.h> is required for NSS" "$LINENO" 5
+fi
+
+
+  ac_fn_c_check_header_mongrel "$LINENO" "nss/nss.h" "ac_cv_header_nss_nss_h" "$ac_includes_default"
+if test "x$ac_cv_header_nss_nss_h" = xyes; then :
+
+else
+  as_fn_error $? "header file <nss/nss.h> is required for NSS" "$LINENO" 5
+fi
+
+
 fi
 
 if test "$with_pam" = yes ; then
@@ -18061,11 +18378,13 @@ fi
 # in the template or configure command line.
 
 # If not selected manually, try to select a source automatically.
-if test x"$USE_OPENSSL_RANDOM" = x"" && test x"$USE_WIN32_RANDOM" = x"" && test x"$USE_DEV_URANDOM" = x"" ; then
-  if test x"$with_openssl" = x"yes" ; then
+if test x"$USE_OPENSSL_RANDOM" = x"" && test x"$USE_WIN32_RANDOM" = x"" && test x"$USE_DEV_URANDOM" = x"" && test x"$USE_NSS_RANDOM" = x"" ; then
+  if test x"$with_ssl" = x"openssl" ; then
     USE_OPENSSL_RANDOM=1
   elif test "$PORTNAME" = "win32" ; then
     USE_WIN32_RANDOM=1
+  elif test x"$with_ssl" = x"nss" ; then
+    USE_NSS_RANDOM=1
   else
     { $as_echo "$as_me:${as_lineno-$LINENO}: checking for /dev/urandom" >&5
 $as_echo_n "checking for /dev/urandom... " >&6; }
diff --git a/configure.ac b/configure.ac
index 5b91c83fd0..7b9f4b10a3 100644
--- a/configure.ac
+++ b/configure.ac
@@ -852,15 +852,6 @@ PGAC_ARG_BOOL(with, bonjour, no,
 AC_MSG_RESULT([$with_bonjour])
 
 
-#
-# OpenSSL
-#
-AC_MSG_CHECKING([whether to build with OpenSSL support])
-PGAC_ARG_BOOL(with, openssl, no, [build with OpenSSL support],
-              [AC_DEFINE([USE_OPENSSL], 1, [Define to build with OpenSSL support. (--with-openssl)])])
-AC_MSG_RESULT([$with_openssl])
-AC_SUBST(with_openssl)
-
 #
 # SELinux
 #
@@ -1209,7 +1200,21 @@ if test "$with_gssapi" = yes ; then
   fi
 fi
 
+#
+# SSL Library
+#
+# There are currently two supported SSL/TLS libraries, OpenSSL and NSS.
+#
+PGAC_ARG_REQ(with, ssl, [LIB], [use LIB for SSL/TLS support (openssl, nss)])
+if test x"$with_ssl" = x"" ; then
+  with_ssl=no
+fi
+PGAC_ARG_BOOL(with, openssl, no, [obsolete spelling of --with-ssl=openssl])
 if test "$with_openssl" = yes ; then
+  with_ssl=openssl
+fi
+
+if test "$with_ssl" = openssl ; then
   dnl Order matters!
   # Minimum required OpenSSL version is 1.0.1
   AC_DEFINE(OPENSSL_API_COMPAT, [0x10001000L],
@@ -1233,7 +1238,31 @@ if test "$with_openssl" = yes ; then
   # thread-safety. In 1.1.0, it's no longer required, and CRYPTO_lock()
   # function was removed.
   AC_CHECK_FUNCS([CRYPTO_lock])
+  AC_DEFINE([USE_OPENSSL], 1, [Define to 1 if you have OpenSSL support.])
+elif test "$with_ssl" = nss ; then
+  # TODO: fallback in case nss-config/nspr-config aren't found.
+  PGAC_PATH_PROGS(NSS_CONFIG, nss-config)
+  PGAC_PATH_PROGS(NSPR_CONFIG, nspr-config)
+  if test -n "$NSS_CONFIG"; then
+    NSS_LIBS=`$NSS_CONFIG --libs`
+	NSS_CFLAGS=`$NSS_CONFIG --cflags`
+  fi
+  if test -n "$NSPR_CONFIG"; then
+	NSPR_LIBS=`$NSPR_CONFIG --libs`
+	NSPR_CFLAGS=`$NSPR_CONFIG --cflags`
+  fi
+
+  LDFLAGS="$LDFLAGS $NSS_LIBS $NSPR_LIBS"
+  CFLAGS="$CFLAGS $NSS_CFLAGS $NSPR_CFLAGS"
+
+  AC_CHECK_LIB(nss3, NSS_InitContext, [], [AC_MSG_ERROR([library 'nss3' is required for NSS])])
+  AC_CHECK_LIB(nspr4, PR_GetDefaultIOMethods, [], [AC_MSG_ERROR([library 'nspr4' is required for NSS])])
+  AC_CHECK_LIB(ssl3, SSL_GetImplementedCiphers, [], [AC_MSG_ERROR([library 'ssl3' is required for NSS])])
+  AC_DEFINE([USE_NSS], 1, [Define to 1 if you have NSS support,])
+elif test "$with_ssl" != no ; then
+  AC_MSG_ERROR([--with-ssl must specify one of openssl or nss])
 fi
+AC_SUBST(with_ssl)
 
 if test "$with_pam" = yes ; then
   AC_CHECK_LIB(pam,    pam_start, [], [AC_MSG_ERROR([library 'pam' is required for PAM])])
@@ -1405,11 +1434,16 @@ if test "$with_gssapi" = yes ; then
 	[AC_CHECK_HEADERS(gssapi.h, [], [AC_MSG_ERROR([gssapi.h header file is required for GSSAPI])])])
 fi
 
-if test "$with_openssl" = yes ; then
+if test "$with_ssl" = openssl ; then
   AC_CHECK_HEADER(openssl/ssl.h, [], [AC_MSG_ERROR([header file <openssl/ssl.h> is required for OpenSSL])])
   AC_CHECK_HEADER(openssl/err.h, [], [AC_MSG_ERROR([header file <openssl/err.h> is required for OpenSSL])])
 fi
 
+if test "$with_ssl" = nss ; then
+  AC_CHECK_HEADER(nss/ssl.h, [], [AC_MSG_ERROR([header file <nss/ssl.h> is required for NSS])])
+  AC_CHECK_HEADER(nss/nss.h, [], [AC_MSG_ERROR([header file <nss/nss.h> is required for NSS])])
+fi
+
 if test "$with_pam" = yes ; then
   AC_CHECK_HEADERS(security/pam_appl.h, [],
                    [AC_CHECK_HEADERS(pam/pam_appl.h, [],
@@ -2158,11 +2192,13 @@ fi
 # in the template or configure command line.
 
 # If not selected manually, try to select a source automatically.
-if test x"$USE_OPENSSL_RANDOM" = x"" && test x"$USE_WIN32_RANDOM" = x"" && test x"$USE_DEV_URANDOM" = x"" ; then
-  if test x"$with_openssl" = x"yes" ; then
+if test x"$USE_OPENSSL_RANDOM" = x"" && test x"$USE_WIN32_RANDOM" = x"" && test x"$USE_DEV_URANDOM" = x"" && test x"$USE_NSS_RANDOM" = x"" ; then
+  if test x"$with_ssl" = x"openssl" ; then
     USE_OPENSSL_RANDOM=1
   elif test "$PORTNAME" = "win32" ; then
     USE_WIN32_RANDOM=1
+  elif test x"$with_ssl" = x"nss" ; then
+    USE_NSS_RANDOM=1
   else
     AC_CHECK_FILE([/dev/urandom], [], [])
 
diff --git a/contrib/postgres_fdw/expected/postgres_fdw.out b/contrib/postgres_fdw/expected/postgres_fdw.out
index 2d88d06358..984efc0d7e 100644
--- a/contrib/postgres_fdw/expected/postgres_fdw.out
+++ b/contrib/postgres_fdw/expected/postgres_fdw.out
@@ -8911,7 +8911,7 @@ DO $d$
     END;
 $d$;
 ERROR:  invalid option "password"
-HINT:  Valid options in this context are: service, passfile, channel_binding, connect_timeout, dbname, host, hostaddr, port, options, application_name, keepalives, keepalives_idle, keepalives_interval, keepalives_count, tcp_user_timeout, sslmode, sslcompression, sslcert, sslkey, sslrootcert, sslcrl, requirepeer, ssl_min_protocol_version, ssl_max_protocol_version, gssencmode, krbsrvname, gsslib, target_session_attrs, use_remote_estimate, fdw_startup_cost, fdw_tuple_cost, extensions, updatable, fetch_size
+HINT:  Valid options in this context are: service, passfile, channel_binding, connect_timeout, dbname, host, hostaddr, port, options, application_name, keepalives, keepalives_idle, keepalives_interval, keepalives_count, tcp_user_timeout, sslmode, sslcompression, sslcert, sslkey, sslrootcert, sslcrl, requirepeer, ssl_min_protocol_version, ssl_max_protocol_version, gssencmode, krbsrvname, gsslib, target_session_attrs, cert_database, use_remote_estimate, fdw_startup_cost, fdw_tuple_cost, extensions, updatable, fetch_size
 CONTEXT:  SQL statement "ALTER SERVER loopback_nopw OPTIONS (ADD password 'dummypw')"
 PL/pgSQL function inline_code_block line 3 at EXECUTE
 -- If we add a password for our user mapping instead, we should get a different
diff --git a/src/Makefile.global.in b/src/Makefile.global.in
index 7ca1e9aac5..bdab2a6825 100644
--- a/src/Makefile.global.in
+++ b/src/Makefile.global.in
@@ -183,7 +183,7 @@ with_icu	= @with_icu@
 with_perl	= @with_perl@
 with_python	= @with_python@
 with_tcl	= @with_tcl@
-with_openssl	= @with_openssl@
+with_ssl	= @with_ssl@
 with_readline	= @with_readline@
 with_selinux	= @with_selinux@
 with_systemd	= @with_systemd@
diff --git a/src/backend/libpq/Makefile b/src/backend/libpq/Makefile
index efc5ef760a..045d2c2f6b 100644
--- a/src/backend/libpq/Makefile
+++ b/src/backend/libpq/Makefile
@@ -28,8 +28,12 @@ OBJS = \
 	pqmq.o \
 	pqsignal.o
 
-ifeq ($(with_openssl),yes)
+ifeq ($(with_ssl),openssl)
 OBJS += be-secure-openssl.o
+else
+ifeq ($(with_ssl),nss)
+OBJS += be-secure-nss.o
+endif
 endif
 
 ifeq ($(with_gssapi),yes)
diff --git a/src/backend/libpq/auth.c b/src/backend/libpq/auth.c
index d132c5cb48..d476101583 100644
--- a/src/backend/libpq/auth.c
+++ b/src/backend/libpq/auth.c
@@ -2870,7 +2870,14 @@ CheckCertAuth(Port *port)
 {
 	int			status_check_usermap = STATUS_ERROR;
 
+#if defined(USE_OPENSSL)
 	Assert(port->ssl);
+#elif defined(USE_NSS)
+	/* TODO: should we rename pr_fd to ssl, to keep consistency? */
+	Assert(port->pr_fd);
+#else
+	Assert(false);
+#endif
 
 	/* Make sure we have received a username in the certificate */
 	if (port->peer_cn == NULL ||
diff --git a/src/backend/libpq/be-secure-nss.c b/src/backend/libpq/be-secure-nss.c
new file mode 100644
index 0000000000..86ac400782
--- /dev/null
+++ b/src/backend/libpq/be-secure-nss.c
@@ -0,0 +1,1193 @@
+/*-------------------------------------------------------------------------
+ *
+ * be-secure-nss.c
+ *	  functions for supporting NSS as a TLS backend
+ *
+ *
+ * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ *	  src/backend/libpq/be-secure-nss.c
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#include "postgres.h"
+
+#include <sys/stat.h>
+
+/*
+ * BITS_PER_BYTE is also defined in the NSPR header files, so we need to undef
+ * our version to avoid compiler warnings on redefinition.
+ */
+#define pg_BITS_PER_BYTE BITS_PER_BYTE
+#undef BITS_PER_BYTE
+
+/*
+ * The nspr/obsolete/protypes.h NSPR header typedefs uint64 and int64 with
+ * colliding definitions from ours, causing a much expected compiler error.
+ * Remove backwards compatibility with ancient NSPR versions to avoid this.
+ */
+#define NO_NSPR_10_SUPPORT
+#include <nspr/nspr.h>
+#include <nspr/prerror.h>
+#include <nspr/prio.h>
+#include <nspr/prmem.h>
+#include <nspr/prtypes.h>
+
+#include <nss/nss.h>
+#include <nss/base64.h>
+#include <nss/cert.h>
+#include <nss/certdb.h>
+#include <nss/hasht.h>
+#include <nss/keyhi.h>
+#include <nss/pk11pub.h>
+#include <nss/secder.h>
+#include <nss/secerr.h>
+#include <nss/secitem.h>
+#include <nss/secoidt.h>
+#include <nss/secport.h>
+#include <nss/ssl.h>
+#include <nss/sslerr.h>
+#include <nss/sslproto.h>
+
+/*
+ * Ensure that the colliding definitions match, else throw an error. In case
+ * NSPR has removed the definition for some reason, make sure to put ours
+ * back again.
+ */
+#if defined(BITS_PER_BYTE)
+#if BITS_PER_BYTE != pg_BITS_PER_BYTE
+#error "incompatible byte widths between NSPR and postgres"
+#endif
+#else
+#define BITS_PER_BYTE pg_BITS_PER_BYTE
+#endif
+#undef pg_BITS_PER_BYTE
+
+#include "common/pg_nss.h"
+#include "lib/stringinfo.h"
+#include "libpq/libpq.h"
+#include "nodes/pg_list.h"
+#include "miscadmin.h"
+#include "storage/fd.h"
+#include "utils/guc.h"
+#include "utils/memutils.h"
+
+
+/* default init hook can be overridden by a shared library */
+static void default_nss_tls_init(bool isServerStart);
+nss_tls_init_hook_type nss_tls_init_hook = default_nss_tls_init;
+
+static PRDescIdentity pr_id;
+
+static PRIOMethods pr_iomethods;
+static NSSInitContext * nss_context = NULL;
+static SSLVersionRange desired_sslver;
+
+static char *external_ssl_passphrase_cb(PK11SlotInfo *slot, PRBool retry, void *arg);
+static bool dummy_ssl_passwd_cb_called = false;
+static bool ssl_is_server_start;
+
+/*
+ * PR_ImportTCPSocket() is a private API, but very widely used, as it's the
+ * only way to make NSS use an already set up POSIX file descriptor rather
+ * than opening one itself. To quote the NSS documentation:
+ *
+ *		"In theory, code that uses PR_ImportTCPSocket may break when NSPR's
+ *		implementation changes. In practice, this is unlikely to happen because
+ *		NSPR's implementation has been stable for years and because of NSPR's
+ *		strong commitment to backward compatibility."
+ *
+ * https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSPR/Reference/PR_ImportTCPSocket
+ *
+ * The function is declared in <private/pprio.h>, but as it is a header marked
+ * private we declare it here rather than including it.
+ */
+NSPR_API(PRFileDesc *) PR_ImportTCPSocket(int);
+
+/* NSS IO layer callback overrides */
+static PRInt32 pg_ssl_read(PRFileDesc * fd, void *buf, PRInt32 amount,
+						   PRIntn flags, PRIntervalTime timeout);
+static PRInt32 pg_ssl_write(PRFileDesc * fd, const void *buf, PRInt32 amount,
+							PRIntn flags, PRIntervalTime timeout);
+/* Utility functions */
+static PRFileDesc * init_iolayer(Port *port);
+static uint16 ssl_protocol_version_to_nss(int v, const char *guc_name);
+
+static char *pg_SSLerrmessage(PRErrorCode errcode);
+static char *ssl_protocol_version_to_string(int v);
+static SECStatus pg_cert_auth_handler(void *arg, PRFileDesc * fd,
+									  PRBool checksig, PRBool isServer);
+static SECStatus pg_bad_cert_handler(void *arg, PRFileDesc * fd);
+static char *dummy_ssl_passphrase_cb(PK11SlotInfo * slot, PRBool retry, void *arg);
+
+/* ------------------------------------------------------------ */
+/*						 Public interface						*/
+/* ------------------------------------------------------------ */
+
+/*
+ * be_tls_init
+ *			Initialize the nss TLS library in the postmaster
+ *
+ * The majority of the setup needs to happen in be_tls_open_server since the
+ * NSPR initialization must happen after the forking of the backend. We could
+ * potentially move some parts in under !isServerStart, but so far this is the
+ * separation chosen.
+ */
+int
+be_tls_init(bool isServerStart)
+{
+	SECStatus	status;
+	SSLVersionRange supported_sslver;
+
+	status = SSL_ConfigServerSessionIDCacheWithOpt(0, 0, NULL, 1, 0, 0, PR_FALSE);
+	if (status != SECSuccess)
+	{
+		ereport(isServerStart ? FATAL : LOG,
+				(errmsg("unable to connect to TLS connection cache: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+		return -1;
+	}
+
+	if (!ssl_database || strlen(ssl_database) == 0)
+	{
+		ereport(isServerStart ? FATAL : LOG,
+				(errmsg("no certificate database specified")));
+		return -1;
+	}
+
+	/*
+	 * We check for the desired TLS version range here, even though we cannot
+	 * set it until be_open_server such that we can be compatible with how the
+	 * OpenSSL backend reports errors for incompatible range configurations.
+	 * Set either the default supported TLS version range, or the configured
+	 * range from ssl_min_protocol_version and ssl_max_protocol version. In
+	 * case the user hasn't defined the maximum allowed version we fall back
+	 * to the highest version TLS that the library supports.
+	 */
+	if (SSL_VersionRangeGetSupported(ssl_variant_stream, &supported_sslver) != SECSuccess)
+	{
+		ereport(isServerStart ? FATAL : LOG,
+				(errmsg("unable to get default protocol support from NSS")));
+		return -1;
+	}
+
+	/*
+	 * Set the fallback versions for the TLS protocol version range to a
+	 * combination of our minimal requirement and the library maximum.
+	 */
+	desired_sslver.min = SSL_LIBRARY_VERSION_TLS_1_0;
+	desired_sslver.max = supported_sslver.max;
+
+	if (ssl_min_protocol_version)
+	{
+		int			ver = ssl_protocol_version_to_nss(ssl_min_protocol_version,
+													  "ssl_min_protocol_version");
+
+		if (ver == -1)
+		{
+			ereport(isServerStart ? FATAL : LOG,
+					(errmsg("\"%s\" setting \"%s\" not supported by this build",
+							"ssl_min_protocol_version",
+							GetConfigOption("ssl_min_protocol_version",
+											false, false))));
+			return -1;
+		}
+
+		if (ver > 0)
+			desired_sslver.min = ver;
+	}
+
+	if (ssl_max_protocol_version)
+	{
+		int			ver = ssl_protocol_version_to_nss(ssl_max_protocol_version,
+													  "ssl_max_protocol_version");
+
+		if (ver == -1)
+		{
+			ereport(isServerStart ? FATAL : LOG,
+					(errmsg("\"%s\" setting \"%s\" not supported by this build",
+							"ssl_max_protocol_version",
+							GetConfigOption("ssl_max_protocol_version",
+											false, false))));
+			return -1;
+		}
+		if (ver > 0)
+			desired_sslver.max = ver;
+
+		if (ver < desired_sslver.min)
+		{
+			ereport(isServerStart ? FATAL : LOG,
+					(errmsg("could not set SSL protocol version range"),
+					 errdetail("\"%s\" cannot be higher than \"%s\"",
+							   "ssl_min_protocol_version",
+							   "ssl_max_protocol_version")));
+			return -1;
+		}
+	}
+
+	/*
+	 * Set the passphrase callback which will be used both to obtain the
+	 * passphrase from the user, as well as by NSS to obtain the phrase
+	 * repeatedly.
+	 */
+	ssl_is_server_start = isServerStart;
+	(*nss_tls_init_hook) (isServerStart);
+
+	return 0;
+}
+
+int
+be_tls_open_server(Port *port)
+{
+	SECStatus	status;
+	PRFileDesc *model;
+	PRFileDesc *pr_fd;
+	PRFileDesc *layer;
+	CERTCertificate *server_cert;
+	SECKEYPrivateKey *private_key;
+	CERTSignedCrl *crl;
+	SECItem		crlname;
+	char	   *cert_database;
+	NSSInitParameters params;
+
+	/*
+	 * The NSPR documentation states that runtime initialization via PR_Init
+	 * is no longer required, as the first caller into NSPR will perform the
+	 * initialization implicitly. The documentation doesn't however clarify
+	 * from which version this is holds true, so let's perform the potentially
+	 * superfluous initialization anyways to avoid crashing on older versions
+	 * of NSPR, as there is no difference in overhead.  The NSS documentation
+	 * still states that PR_Init must be called in some way (implicitly or
+	 * explicitly).
+	 *
+	 * The below parameters are what the implicit initialization would've done
+	 * for us, and should work even for older versions where it might not be
+	 * done automatically. The last parameter, maxPTDs, is set to various
+	 * values in other codebases, but has been unused since NSPR 2.1 which was
+	 * released sometime in 1998. In current versions of NSPR all parameters
+	 * are ignored.
+	 */
+	PR_Init(PR_USER_THREAD, PR_PRIORITY_NORMAL, 0 /* maxPTDs */ );
+
+	/*
+	 * The certificate path (configdir) must contain a valid NSS database. If
+	 * the certificate path isn't a valid directory, NSS will fall back on the
+	 * system certificate database. If the certificate path is a directory but
+	 * is empty then the initialization will fail. On the client side this can
+	 * be allowed for any sslmode but the verify-xxx ones.
+	 * https://bugzilla.redhat.com/show_bug.cgi?id=728562 For the server side
+	 * we wont allow this to fail however, as we require the certificate and
+	 * key to exist.
+	 *
+	 * The original design of NSS was for a single application to use a single
+	 * copy of it, initialized with NSS_Initialize() which isn't returning any
+	 * handle with which to refer to NSS. NSS initialization and shutdown are
+	 * global for the application, so a shutdown in another NSS enabled
+	 * library would cause NSS to be stopped for libpq as well.  The fix has
+	 * been to introduce NSS_InitContext which returns a context handle to
+	 * pass to NSS_ShutdownContext.  NSS_InitContext was introduced in NSS
+	 * 3.12, but the use of it is not very well documented.
+	 * https://bugzilla.redhat.com/show_bug.cgi?id=738456
+	 *
+	 * The InitParameters struct passed can be used to override internal
+	 * values in NSS, but the usage is not documented at all. When using
+	 * NSS_Init initializations, the values are instead set via PK11_Configure
+	 * calls so the PK11_Configure documentation can be used to glean some
+	 * details on these.
+	 *
+	 * https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS/PKCS11/Module_Specs
+	 */
+	memset(&params, '\0', sizeof(params));
+	params.length = sizeof(params);
+
+	if (!ssl_database || strlen(ssl_database) == 0)
+		ereport(FATAL,
+				(errmsg("no certificate database specified")));
+
+	cert_database = psprintf("sql:%s", ssl_database);
+	nss_context = NSS_InitContext(cert_database, "", "", "",
+								  &params,
+								  NSS_INIT_READONLY | NSS_INIT_PK11RELOAD);
+	pfree(cert_database);
+
+	if (!nss_context)
+		ereport(FATAL,
+				(errmsg("unable to read certificate database \"%s\": %s",
+						ssl_database, pg_SSLerrmessage(PR_GetError()))));
+
+	/*
+	 * Import the already opened socket as we don't want to use NSPR functions
+	 * for opening the network socket due to how the PostgreSQL protocol works
+	 * with TLS connections. This function is not part of the NSPR public API,
+	 * see the comment at the top of the file for the rationale of still using
+	 * it.
+	 */
+	pr_fd = PR_ImportTCPSocket(port->sock);
+	if (!pr_fd)
+		ereport(ERROR,
+				(errmsg("unable to connect to socket")));
+
+	/*
+	 * Most of the documentation available, and implementations of, NSS/NSPR
+	 * use the PR_NewTCPSocket() function here, which has the drawback that it
+	 * can only create IPv4 sockets. Instead use PR_OpenTCPSocket() which
+	 * copes with IPv6 as well.
+	 *
+	 * We use a model filedescriptor here which is a construct in NSPR/NSS in
+	 * order to create a configuration template for sockets which can then be
+	 * applied to new sockets created. This makes more sense in a server which
+	 * accepts multiple connections and want to perform the boilerplate just
+	 * once, but it does provide a nice abstraction here aswell in that we can
+	 * error out early without having performed any operation on the real
+	 * socket.
+	 */
+	model = PR_OpenTCPSocket(port->laddr.addr.ss_family);
+	if (!model)
+		ereport(ERROR,
+				(errmsg("unable to open socket")));
+
+	/*
+	 * Convert the NSPR socket to an SSL socket. Ensuring the success of this
+	 * operation is critical as NSS SSL_* functions may return SECSuccess on
+	 * the socket even though SSL hasn't been enabled, which introduce a risk
+	 * of silent downgrades.
+	 */
+	model = SSL_ImportFD(NULL, model);
+	if (!model)
+		ereport(ERROR,
+				(errmsg("unable to enable TLS on socket")));
+
+	/*
+	 * Configure basic settings for the connection over the SSL socket in
+	 * order to set it up as a server.
+	 */
+	if (SSL_OptionSet(model, SSL_SECURITY, PR_TRUE) != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to configure TLS connection")));
+
+	if (SSL_OptionSet(model, SSL_HANDSHAKE_AS_SERVER, PR_TRUE) != SECSuccess ||
+		SSL_OptionSet(model, SSL_HANDSHAKE_AS_CLIENT, PR_FALSE) != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to configure TLS connection as server")));
+
+	/*
+	 * SSLv2 is disabled by default, and SSLv3 will be excluded from the range
+	 * of allowed protocols further down. Since we really don't want these to
+	 * ever be enabled, let's use belts and suspenders and explicitly turn
+	 * them off as well.
+	 */
+	SSL_OptionSet(model, SSL_ENABLE_SSL2, PR_FALSE);
+	SSL_OptionSet(model, SSL_ENABLE_SSL3, PR_FALSE);
+
+#ifdef SSL_CBC_RANDOM_IV
+
+	/*
+	 * Enable protection against the BEAST attack in case the NSS server has
+	 * support for that. While SSLv3 is disabled, we may still allow TLSv1
+	 * which is affected. The option isn't documented as an SSL option, but as
+	 * an NSS environment variable.
+	 */
+	SSL_OptionSet(model, SSL_CBC_RANDOM_IV, PR_TRUE);
+#endif
+
+	/*
+	 * Configure the allowed ciphers. If there are no user preferred suites,
+	 * set the domestic policy.
+	 *
+	 * Historically there were different cipher policies based on export (and
+	 * import) restrictions: Domestic, Export and France. These are since long
+	 * removed with all ciphers being enabled by default. Due to backwards
+	 * compatibility, the old API is still used even though all three policies
+	 * now do the same thing.
+	 *
+	 * If SSLCipherSuites define a policy of the user, we set that rather than
+	 * enabling all ciphers via NSS_SetDomesticPolicy.
+	 *
+	 * TODO: while this code works, the set of ciphers which can be set and
+	 * still end up with a working socket is woefully underdocumented for
+	 * anything more recent than SSLv3 (the code for TLS actually calls ssl3
+	 * functions under the hood for SSL_CipherPrefSet), so it's unclear if this
+	 * is helpful or not. Using the policies works, but may be too coarsely
+	 * grained.
+	 *
+	 * Another TODO: The SSL_ImplementedCiphers table returned with calling
+	 * SSL_GetImplementedCiphers is sorted in server preference order. Sorting
+	 * SSLCipherSuites according to the order of the ciphers therein could be
+	 * a way to implement ssl_prefer_server_ciphers - if we at all want to use
+	 * cipher selection for NSS like how we do it for OpenSSL that is.
+	 */
+
+	/*
+	 * If no ciphers are specified, enable them all.
+	 */
+	if (!SSLCipherSuites || strlen(SSLCipherSuites) == 0)
+	{
+		status = NSS_SetDomesticPolicy();
+		if (status != SECSuccess)
+			ereport(ERROR,
+					(errmsg("unable to set cipher policy: %s",
+							pg_SSLerrmessage(PR_GetError()))));
+	}
+	else
+	{
+		char	   *ciphers,
+				   *c;
+
+		char	   *sep = ":;, ";
+		PRUint16	ciphercode;
+		const		PRUint16 *nss_ciphers;
+
+		/*
+		 * If the user has specified a set of preferred cipher suites we start
+		 * by turning off all the existing suites to avoid the risk of down-
+		 * grades to a weaker cipher than expected.
+		 */
+		nss_ciphers = SSL_GetImplementedCiphers();
+		for (int i = 0; i < SSL_GetNumImplementedCiphers(); i++)
+			SSL_CipherPrefSet(model, nss_ciphers[i], PR_FALSE);
+
+		ciphers = pstrdup(SSLCipherSuites);
+
+		for (c = strtok(ciphers, sep); c; c = strtok(NULL, sep))
+		{
+			ciphercode = pg_find_cipher(c);
+			if (ciphercode != INVALID_CIPHER)
+			{
+				status = SSL_CipherPrefSet(model, ciphercode, PR_TRUE);
+				if (status != SECSuccess)
+					ereport(ERROR,
+							(errmsg("invalid cipher-suite specified: %s", c)));
+			}
+		}
+
+		pfree(ciphers);
+	}
+
+	if (SSL_VersionRangeSet(model, &desired_sslver) != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to set requested SSL protocol version range")));
+
+	/*
+	 * Set up the custom IO layer.
+	 */
+	layer = init_iolayer(port);
+	if (!layer)
+		goto error;
+
+	/* Store the Port as private data available in callbacks */
+	layer->secret = (void *) port;
+
+	if (PR_PushIOLayer(pr_fd, PR_TOP_IO_LAYER, layer) != PR_SUCCESS)
+	{
+		PR_Close(layer);
+		ereport(ERROR,
+				(errmsg("unable to push IO layer")));
+	}
+
+	server_cert = PK11_FindCertFromNickname(ssl_cert_file, (void *) port);
+	if (!server_cert)
+	{
+		if (dummy_ssl_passwd_cb_called)
+			ereport(ERROR,
+					(errmsg("unable to load certificate for \"%s\": %s",
+							ssl_cert_file, pg_SSLerrmessage(PR_GetError())),
+					 errhint("The certificate requires a password.")));
+		else
+			ereport(ERROR,
+					(errmsg("unable to find certificate for \"%s\": %s",
+							ssl_cert_file, pg_SSLerrmessage(PR_GetError()))));
+	}
+
+	private_key = PK11_FindKeyByAnyCert(server_cert, (void *) port);
+	if (!private_key)
+	{
+		if (dummy_ssl_passwd_cb_called)
+			ereport(ERROR,
+					(errmsg("unable to load private key for \"%s\": %s",
+							ssl_cert_file, pg_SSLerrmessage(PR_GetError())),
+					 errhint("The private key requires a password.")));
+		else
+			ereport(ERROR,
+					(errmsg("unable to find private key for \"%s\": %s",
+							ssl_cert_file, pg_SSLerrmessage(PR_GetError()))));
+	}
+
+	/*
+	 * NSS doesn't use CRL files on disk, so we use the ssl_crl_file guc to
+	 * contain the CRL nickname for the current server certificate in the NSS
+	 * certificate database. The main difference from the OpenSSL backend is
+	 * that NSS will use the CRL regardless, but being able to make sure the
+	 * CRL is loaded seems like a good feature.
+	 */
+	if (ssl_crl_file[0])
+	{
+		SECITEM_CopyItem(NULL, &crlname, &server_cert->derSubject);
+		crl = SEC_FindCrlByName(CERT_GetDefaultCertDB(), &crlname, SEC_CRL_TYPE);
+		if (!crl)
+			ereport(ERROR,
+					(errmsg("specified CRL not found in database")));
+		SEC_DestroyCrl(crl);
+	}
+
+	/*
+	 * Finally we must configure the socket for being a server by setting the
+	 * certificate and key. The NULL parameter is an SSLExtraServerCertData
+	 * pointer with the final parameter being the size of the extra server
+	 * cert data structure pointed to. This is typically only used for
+	 * credential delegation.
+	 */
+	status = SSL_ConfigServerCert(model, server_cert, private_key, NULL, 0);
+	if (status != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to configure server for TLS server connections: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+
+	ssl_loaded_verify_locations = true;
+
+	/*
+	 * At this point, we no longer have use for the certificate and private
+	 * key as they have been copied into the context by NSS. Destroy our
+	 * copies explicitly to clean out the memory as best we can.
+	 */
+	CERT_DestroyCertificate(server_cert);
+	SECKEY_DestroyPrivateKey(private_key);
+
+	status = SSL_AuthCertificateHook(model, pg_cert_auth_handler, (void *) port);
+	if (status != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to install authcert hook: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+	SSL_BadCertHook(model, pg_bad_cert_handler, (void *) port);
+	SSL_OptionSet(model, SSL_REQUEST_CERTIFICATE, PR_TRUE);
+	SSL_OptionSet(model, SSL_REQUIRE_CERTIFICATE, PR_FALSE);
+
+	port->pr_fd = SSL_ImportFD(model, pr_fd);
+	if (!port->pr_fd)
+		ereport(ERROR,
+				(errmsg("unable to initialize")));
+
+	PR_Close(model);
+
+	/*
+	 * Force a handshake on the next I/O request, the second parameter means
+	 * that we are a server, PR_FALSE would indicate being a client. NSPR
+	 * requires us to call SSL_ResetHandshake since we imported an already
+	 * established socket.
+	 */
+	status = SSL_ResetHandshake(port->pr_fd, PR_TRUE);
+	if (status != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to initiate handshake: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+	status = SSL_ForceHandshake(port->pr_fd);
+	if (status != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to handshake: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+
+	port->ssl_in_use = true;
+	return 0;
+
+error:
+	return 1;
+}
+
+ssize_t
+be_tls_read(Port *port, void *ptr, size_t len, int *waitfor)
+{
+	ssize_t		n_read;
+	PRErrorCode err;
+
+	n_read = PR_Read(port->pr_fd, ptr, len);
+
+	if (n_read < 0)
+	{
+		err = PR_GetError();
+
+		if (err == PR_WOULD_BLOCK_ERROR)
+		{
+			*waitfor = WL_SOCKET_READABLE;
+			errno = EWOULDBLOCK;
+		}
+		else
+			errno = ECONNRESET;
+	}
+
+	return n_read;
+}
+
+ssize_t
+be_tls_write(Port *port, void *ptr, size_t len, int *waitfor)
+{
+	ssize_t		n_write;
+	PRErrorCode err;
+	PRIntn		flags = 0;
+
+	/*
+	 * The flags parameter to PR_Send is no longer used and is, according to
+	 * the documentation, required to be zero.
+	 */
+	n_write = PR_Send(port->pr_fd, ptr, len, flags, PR_INTERVAL_NO_WAIT);
+
+	if (n_write < 0)
+	{
+		err = PR_GetError();
+
+		if (err == PR_WOULD_BLOCK_ERROR)
+		{
+			*waitfor = WL_SOCKET_WRITEABLE;
+			errno = EWOULDBLOCK;
+		}
+		else
+			errno = ECONNRESET;
+	}
+
+	return n_write;
+}
+
+void
+be_tls_close(Port *port)
+{
+	if (!port)
+		return;
+
+	if (port->peer_cn)
+	{
+		SSL_InvalidateSession(port->pr_fd);
+		pfree(port->peer_cn);
+		port->peer_cn = NULL;
+	}
+
+	PR_Close(port->pr_fd);
+	port->pr_fd = NULL;
+	port->ssl_in_use = false;
+
+	if (nss_context)
+	{
+		NSS_ShutdownContext(nss_context);
+		nss_context = NULL;
+	}
+}
+
+void
+be_tls_destroy(void)
+{
+	/*
+	 * It reads a bit odd to clear a session cache when we are destroying the
+	 * context altogether, but if the session cache isn't cleared before
+	 * shutting down the context it will fail with SEC_ERROR_BUSY.
+	 */
+	SSL_ClearSessionCache();
+}
+
+int
+be_tls_get_cipher_bits(Port *port)
+{
+	SECStatus	status;
+	SSLChannelInfo channel;
+	SSLCipherSuiteInfo suite;
+
+	status = SSL_GetChannelInfo(port->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+		goto error;
+
+	status = SSL_GetCipherSuiteInfo(channel.cipherSuite, &suite, sizeof(suite));
+	if (status != SECSuccess)
+		goto error;
+
+	return suite.effectiveKeyBits;
+
+error:
+	ereport(WARNING,
+			(errmsg("unable to extract TLS session information: %s",
+					pg_SSLerrmessage(PR_GetError()))));
+	return 0;
+}
+
+/*
+ * be_tls_get_compression
+ *
+ * NSS disabled support for TLS compression in version 3.33 and removed the
+ * code in a subsequent release. The API for retrieving information about
+ * compression as well as enabling it is kept for backwards compatibility, but
+ * we don't need to consult it since it was only available for SSLv3 which we
+ * don't support.
+ *
+ * https://bugzilla.mozilla.org/show_bug.cgi?id=1409587
+ */
+bool
+be_tls_get_compression(Port *port)
+{
+	return false;
+}
+
+/*
+ * be_tls_get_version
+ *
+ * Returns the protocol version used for the current connection, or NULL in
+ * case of errors.
+ */
+const char *
+be_tls_get_version(Port *port)
+{
+	SECStatus	status;
+	SSLChannelInfo channel;
+
+	status = SSL_GetChannelInfo(port->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+	{
+		ereport(WARNING,
+				(errmsg("unable to extract TLS session information: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+		return NULL;
+	}
+
+	return ssl_protocol_version_to_string(channel.protocolVersion);
+}
+
+const char *
+be_tls_get_cipher(Port *port)
+{
+	SECStatus	status;
+	SSLChannelInfo channel;
+	SSLCipherSuiteInfo suite;
+
+	status = SSL_GetChannelInfo(port->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+		goto error;
+
+	status = SSL_GetCipherSuiteInfo(channel.cipherSuite, &suite, sizeof(suite));
+	if (status != SECSuccess)
+		goto error;
+
+	return suite.cipherSuiteName;
+
+error:
+	ereport(WARNING,
+			(errmsg("unable to extract TLS session information: %s",
+					pg_SSLerrmessage(PR_GetError()))));
+	return NULL;
+}
+
+void
+be_tls_get_peer_subject_name(Port *port, char *ptr, size_t len)
+{
+	CERTCertificate *certificate;
+
+	certificate = SSL_PeerCertificate(port->pr_fd);
+	if (certificate)
+		strlcpy(ptr, CERT_NameToAscii(&certificate->subject), len);
+	else
+		ptr[0] = '\0';
+}
+
+void
+be_tls_get_peer_issuer_name(Port *port, char *ptr, size_t len)
+{
+	CERTCertificate *certificate;
+
+	certificate = SSL_PeerCertificate(port->pr_fd);
+	if (certificate)
+		strlcpy(ptr, CERT_NameToAscii(&certificate->issuer), len);
+	else
+		ptr[0] = '\0';
+}
+
+void
+be_tls_get_peer_serial(Port *port, char *ptr, size_t len)
+{
+	CERTCertificate *certificate;
+
+	certificate = SSL_PeerCertificate(port->pr_fd);
+	if (certificate)
+		snprintf(ptr, len, "%li", DER_GetInteger(&(certificate->serialNumber)));
+	else
+		ptr[0] = '\0';
+}
+
+char *
+be_tls_get_certificate_hash(Port *port, size_t *len)
+{
+	CERTCertificate	   *certificate;
+	SECOidTag			signature_alg;
+	SECOidTag			digest_alg;
+	int					digest_len;
+	SECStatus			status;
+	PLArenaPool		   *arena = NULL;
+	SECItem				digest;
+	char			   *ret;
+
+	*len = 0;
+	certificate = SSL_LocalCertificate(port->pr_fd);
+	if (!certificate)
+		return NULL;
+
+	signature_alg = SECOID_GetAlgorithmTag(&certificate->signature);
+	/* Set sha-256 as a default */
+	digest_alg = SEC_OID_SHA256;
+	digest_len = SHA256_LENGTH;
+
+	while (NSS_SCRAMDigestAlgorithm->signature)
+	{
+		if (signature_alg == NSS_SCRAMDigestAlgorithm->signature)
+		{
+			digest_alg = NSS_SCRAMDigestAlgorithm->hash;
+			digest_len = NSS_SCRAMDigestAlgorithm->len;
+			break;
+		}
+	}
+
+	arena = PORT_NewArena(SEC_ASN1_DEFAULT_ARENA_SIZE);
+	digest.data = PORT_ArenaZAlloc(arena, sizeof(unsigned char) * digest_len);
+	digest.len = digest_len;
+
+	status = PK11_HashBuf(digest_alg, digest.data,
+						  certificate->derCert.data,
+						  certificate->derCert.len);
+
+	if (status != SECSuccess)
+	{
+		PORT_FreeArena(arena, PR_TRUE);
+		return NULL;
+	}
+
+	ret = palloc(digest.len);
+	memcpy(ret, digest.data, digest.len);
+	*len = digest_len;
+	PORT_FreeArena(arena, PR_TRUE);
+
+	return ret;
+}
+
+/* ------------------------------------------------------------ */
+/*						Internal functions						*/
+/* ------------------------------------------------------------ */
+
+/*
+ * default_nss_tls_init
+ *
+ * The default TLS init hook function which users can override for installing
+ * their own passphrase callbacks and similar actions. In case no callback has
+ * been configured, or the callback isn't reload capable during a server
+ * reload, the dummy callback will be installed.
+ *
+ * The private data for the callback is set differently depending on how it's
+ * invoked. For calls which may invoke the callback deeper in the callstack
+ * the private data is set with SSL_SetPKCS11PinArg. When the call is directly
+ * invoking the callback, like PK11_FindCertFromNickname, then the private
+ * data is passed as a parameter. Setting the data with SSL_SetPKCS11PinArg is
+ * thus not required but good practice.
+ *
+ * NSS doesn't provide a default callback like OpenSSL does, but a callback is
+ * required to be set.  The password callback can be installed at any time, but
+ * setting the private data with SSL_SetPKCS11PinArg requires a PR Filedesc.
+ */
+static void
+default_nss_tls_init(bool isServerStart)
+{
+	/*
+	 * No user-defined callback has been configured, install the dummy call-
+	 * back since we must set something.
+	 */
+	if (!ssl_passphrase_command[0])
+		PK11_SetPasswordFunc(dummy_ssl_passphrase_cb);
+	else
+	{
+		/*
+		 * There is a user-defined callback, set it unless we are in a restart
+		 * and cannot handle restarts due to an interactive callback.
+		 */
+		if (isServerStart)
+			PK11_SetPasswordFunc(external_ssl_passphrase_cb);
+		else
+		{
+			if (ssl_passphrase_command_supports_reload)
+				PK11_SetPasswordFunc(external_ssl_passphrase_cb);
+			else
+				PK11_SetPasswordFunc(dummy_ssl_passphrase_cb);
+		}
+	}
+}
+
+/*
+ * external_ssl_passphrase_cb
+ *
+ * Runs the callback configured by ssl_passphrase_command and returns the
+ * captured password back to NSS.
+ */
+static char *
+external_ssl_passphrase_cb(PK11SlotInfo *slot, PRBool retry, void *arg)
+{
+	/*
+	 * NSS use a hardcoded 256 byte buffer for reading the password so set the
+	 * same limit for our callback buffer.
+	 */
+	char		buf[256];
+	int			len;
+	char	   *password = NULL;
+	char	   *prompt;
+
+	/*
+	 * Since there is no password callback in NSS when the server starts up,
+	 * it makes little sense to create an interactive callback. Thus, if this
+	 * is a retry attempt then give up immediately.
+	 */
+	if (retry)
+		return NULL;
+
+	/*
+	 * Construct the same prompt that NSS uses internally even though it is
+	 * unlikely to serve much purpose, but we must set a prompt so we might
+	 * as well do it right.
+	 */
+	prompt = psprintf("Enter Password or Pin for \"%s\":",
+					  PK11_GetTokenName(slot));
+
+	len = run_ssl_passphrase_command(prompt, ssl_is_server_start, buf, sizeof(buf));
+	pfree(prompt);
+
+	if (!len)
+		return NULL;
+
+	/*
+	 * At least one byte with password content was returned, and NSS requires
+	 * that we return it allocated in NSS controlled memory. If we fail to
+	 * allocate then abort without passing back NULL and bubble up the error
+	 * on the PG side.
+	 */
+	password = (char *) PR_Malloc(len + 1);
+	if (!password)
+	{
+		explicit_bzero(buf, sizeof(buf));
+		ereport(ERROR,
+				(errcode(ERRCODE_OUT_OF_MEMORY),
+				 errmsg("out of memory")));
+	}
+	strlcpy(password, buf, sizeof(password));
+	explicit_bzero(buf, sizeof(buf));
+
+	return password;
+}
+
+/*
+ * dummy_ssl_passphrase_cb
+ *
+ * Return unsuccessful if we are asked to provide the passphrase for a cert or
+ * key, without having a passphrase callback installed.
+ */
+static char *
+dummy_ssl_passphrase_cb(PK11SlotInfo *slot, PRBool retry, void *arg)
+{
+	dummy_ssl_passwd_cb_called = true;
+	return NULL;
+}
+
+static SECStatus
+pg_bad_cert_handler(void *arg, PRFileDesc * fd)
+{
+	Port	   *port = (Port *) arg;
+
+	port->peer_cert_valid = false;
+	return SECFailure;
+}
+
+static SECStatus
+pg_cert_auth_handler(void *arg, PRFileDesc * fd, PRBool checksig, PRBool isServer)
+{
+	SECStatus	status;
+	Port	   *port = (Port *) arg;
+	CERTCertificate *cert;
+	char	   *peer_cn;
+	int			len;
+
+	status = SSL_AuthCertificate(CERT_GetDefaultCertDB(), port->pr_fd, checksig, PR_TRUE);
+	if (status == SECSuccess)
+	{
+		cert = SSL_PeerCertificate(port->pr_fd);
+		len = strlen(cert->subjectName);
+		peer_cn = MemoryContextAllocZero(TopMemoryContext, len + 1);
+		/*
+		 * Skip over the key= portion of the key=value containing the the
+		 * peer CN.
+		 */
+		if (strncmp(cert->subjectName, "CN=", 3) == 0)
+			strlcpy(peer_cn, cert->subjectName + strlen("CN="), len + 1);
+		else
+			strlcpy(peer_cn, cert->subjectName, len + 1);
+		CERT_DestroyCertificate(cert);
+
+		port->peer_cn = peer_cn;
+		port->peer_cert_valid = true;
+	}
+
+	return status;
+}
+
+static PRInt32
+pg_ssl_read(PRFileDesc *fd, void *buf, PRInt32 amount, PRIntn flags,
+			PRIntervalTime timeout)
+{
+	PRRecvFN	read_fn;
+	PRInt32		n_read;
+
+	read_fn = fd->lower->methods->recv;
+	n_read = read_fn(fd->lower, buf, amount, flags, timeout);
+
+	return n_read;
+}
+
+static PRInt32
+pg_ssl_write(PRFileDesc *fd, const void *buf, PRInt32 amount, PRIntn flags,
+			 PRIntervalTime timeout)
+{
+	PRSendFN	send_fn;
+	PRInt32		n_write;
+
+	send_fn = fd->lower->methods->send;
+	n_write = send_fn(fd->lower, buf, amount, flags, timeout);
+
+	return n_write;
+}
+
+static PRFileDesc *
+init_iolayer(Port *port)
+{
+	const		PRIOMethods *default_methods;
+	PRFileDesc *layer;
+
+	/*
+	 * Start by initializing our layer with all the default methods so that we
+	 * can selectively override the ones we want while still ensuring that we
+	 * have a complete layer specification.
+	 */
+	default_methods = PR_GetDefaultIOMethods();
+	memcpy(&pr_iomethods, default_methods, sizeof(PRIOMethods));
+
+	pr_iomethods.recv = pg_ssl_read;
+	pr_iomethods.send = pg_ssl_write;
+
+	/*
+	 * Each IO layer must be identified by a unique name, where uniqueness is
+	 * per connection. Each connection in a postgres cluster can generate the
+	 * identity from the same string as they will create their IO layers on
+	 * different sockets. Only one layer per socket can have the same name.
+	 */
+	pr_id = PR_GetUniqueIdentity("PostgreSQL Server");
+	if (pr_id == PR_INVALID_IO_LAYER)
+	{
+		ereport(ERROR,
+				(errmsg("out of memory when setting up TLS connection")));
+		return NULL;
+	}
+
+	/*
+	 * Create the actual IO layer as a stub such that it can be pushed onto
+	 * the layer stack. The step via a stub is required as we define custom
+	 * callbacks.
+	 */
+	layer = PR_CreateIOLayerStub(pr_id, &pr_iomethods);
+	if (!layer)
+	{
+		ereport(ERROR,
+				(errmsg("unable to create NSS I/O layer")));
+		return NULL;
+	}
+
+	return layer;
+}
+
+static char *
+ssl_protocol_version_to_string(int v)
+{
+	switch (v)
+	{
+			/* SSL v2 and v3 are not supported */
+		case SSL_LIBRARY_VERSION_2:
+		case SSL_LIBRARY_VERSION_3_0:
+			Assert(false);
+			break;
+
+		case SSL_LIBRARY_VERSION_TLS_1_0:
+			return pstrdup("TLSv1.0");
+		case SSL_LIBRARY_VERSION_TLS_1_1:
+			return pstrdup("TLSv1.1");
+		case SSL_LIBRARY_VERSION_TLS_1_2:
+			return pstrdup("TLSv1.2");
+		case SSL_LIBRARY_VERSION_TLS_1_3:
+			return pstrdup("TLSv1.3");
+	}
+
+	return pstrdup("unknown");
+}
+
+
+/*
+ * ssl_protocol_version_to_nss
+ *			Translate PostgreSQL TLS version to NSS version
+ *
+ * Returns zero in case the requested TLS version is undefined (PG_ANY) and
+ * should be set by the caller, or -1 on failure.
+ */
+static uint16
+ssl_protocol_version_to_nss(int v, const char *guc_name)
+{
+	switch (v)
+	{
+			/*
+			 * There is no SSL_LIBRARY_ macro defined in NSS with the value
+			 * zero, so we use this to signal the caller that the highest
+			 * useful version should be set on the connection.
+			 */
+		case PG_TLS_ANY:
+			return 0;
+
+			/*
+			 * No guard is required here as there are no versions of NSS
+			 * without support for TLS1.
+			 */
+		case PG_TLS1_VERSION:
+			return SSL_LIBRARY_VERSION_TLS_1_0;
+		case PG_TLS1_1_VERSION:
+#ifdef SSL_LIBRARY_VERSION_TLS_1_1
+			return SSL_LIBRARY_VERSION_TLS_1_1;
+#else
+			break;
+#endif
+		case PG_TLS1_2_VERSION:
+#ifdef SSL_LIBRARY_VERSION_TLS_1_2
+			return SSL_LIBRARY_VERSION_TLS_1_2;
+#else
+			break;
+#endif
+		case PG_TLS1_3_VERSION:
+#ifdef SSL_LIBRARY_VERSION_TLS_1_3
+			return SSL_LIBRARY_VERSION_TLS_1_3;
+#else
+			break;
+#endif
+		default:
+			break;
+	}
+
+	return -1;
+}
+
+/*
+ * pg_SSLerrmessage
+ *		Create and return a human readable error message given
+ *		the specified error code
+ *
+ * PR_ErrorToName only converts the enum identifier of the error to string,
+ * but that can be quite useful for debugging (and in case PR_ErrorToString is
+ * unable to render a message then we at least have something).
+ */
+static char *
+pg_SSLerrmessage(PRErrorCode errcode)
+{
+	return psprintf("%s (%s)",
+					PR_ErrorToString(errcode, PR_LANGUAGE_I_DEFAULT),
+					PR_ErrorToName(errcode));
+}
diff --git a/src/backend/libpq/be-secure.c b/src/backend/libpq/be-secure.c
index 2ae507a902..f39977b80c 100644
--- a/src/backend/libpq/be-secure.c
+++ b/src/backend/libpq/be-secure.c
@@ -49,6 +49,9 @@ bool		ssl_passphrase_command_supports_reload;
 #ifdef USE_SSL
 bool		ssl_loaded_verify_locations = false;
 #endif
+#ifdef USE_NSS
+char	   *ssl_database;
+#endif
 
 /* GUC variable controlling SSL cipher list */
 char	   *SSLCipherSuites = NULL;
diff --git a/src/backend/libpq/hba.c b/src/backend/libpq/hba.c
index 3a78d2043e..eb1b028464 100644
--- a/src/backend/libpq/hba.c
+++ b/src/backend/libpq/hba.c
@@ -1040,7 +1040,7 @@ parse_hba_line(TokenizedLine *tok_line, int elevel)
 			ereport(elevel,
 					(errcode(ERRCODE_CONFIG_FILE_ERROR),
 					 errmsg("hostssl record cannot match because SSL is not supported by this build"),
-					 errhint("Compile with --with-openssl to use SSL connections."),
+					 errhint("Compile with --with-openssl or --with-nss to use SSL connections."),
 					 errcontext("line %d of configuration file \"%s\"",
 								line_num, HbaFileName)));
 			*err_msg = "hostssl record cannot match because SSL is not supported by this build";
diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c
index a62d64eaa4..050f673c68 100644
--- a/src/backend/utils/misc/guc.c
+++ b/src/backend/utils/misc/guc.c
@@ -4262,7 +4262,11 @@ static struct config_string ConfigureNamesString[] =
 		},
 		&ssl_library,
 #ifdef USE_SSL
+#if defined(USE_OPENSSL)
 		"OpenSSL",
+#elif defined(USE_NSS)
+		"NSS",
+#endif
 #else
 		"",
 #endif
@@ -4320,6 +4324,18 @@ static struct config_string ConfigureNamesString[] =
 		check_canonical_path, assign_pgstat_temp_directory, NULL
 	},
 
+#ifdef USE_NSS
+	{
+		{"ssl_database", PGC_SIGHUP, CONN_AUTH_SSL,
+			gettext_noop("Location of the NSS certificate database."),
+			NULL
+		},
+		&ssl_database,
+		"",
+		NULL, NULL, NULL
+	},
+#endif
+
 	{
 		{"synchronous_standby_names", PGC_SIGHUP, REPLICATION_PRIMARY,
 			gettext_noop("Number of synchronous standbys and list of names of potential synchronous ones."),
@@ -4348,8 +4364,10 @@ static struct config_string ConfigureNamesString[] =
 			GUC_SUPERUSER_ONLY
 		},
 		&SSLCipherSuites,
-#ifdef USE_OPENSSL
+#if defined(USE_OPENSSL)
 		"HIGH:MEDIUM:+3DES:!aNULL",
+#elif defined (USE_NSS)
+		"",
 #else
 		"none",
 #endif
diff --git a/src/common/Makefile b/src/common/Makefile
index 25c55bd642..614f93af09 100644
--- a/src/common/Makefile
+++ b/src/common/Makefile
@@ -79,7 +79,7 @@ OBJS_COMMON = \
 	wait_error.o \
 	wchar.o
 
-ifeq ($(with_openssl),yes)
+ifeq ($(with_ssl),openssl)
 OBJS_COMMON += \
 	protocol_openssl.o \
 	sha2_openssl.o
diff --git a/src/include/common/pg_nss.h b/src/include/common/pg_nss.h
new file mode 100644
index 0000000000..008fee85f1
--- /dev/null
+++ b/src/include/common/pg_nss.h
@@ -0,0 +1,175 @@
+/*-------------------------------------------------------------------------
+ *
+ * pg_nss.h
+ *	  Support for NSS as a TLS backend
+ *
+ * These definitions are used by both frontend and backend code.
+ *
+ * Copyright (c) 2020, PostgreSQL Global Development Group
+ *
+ * IDENTIFICATION
+ *        src/include/common/pg_nss.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef PG_NSS_H
+#define PG_NSS_H
+
+#ifdef USE_NSS
+#define NO_NSPR_10_SUPPORT
+#include <nss/hasht.h>
+#include <nss/secoidt.h>
+#include <nss/sslproto.h>
+
+PRUint16	pg_find_cipher(char *name);
+
+typedef struct
+{
+	SECOidTag	signature;
+	SECOidTag	hash;
+	int			len;
+}			NSSSignatureAlgorithms;
+
+typedef struct
+{
+	const char *name;
+	PRUint16	number;
+}			NSSCiphers;
+
+#define INVALID_CIPHER	0xFFFF
+
+static const NSSSignatureAlgorithms NSS_SCRAMDigestAlgorithm[] = {
+
+	{SEC_OID_PKCS1_MD5_WITH_RSA_ENCRYPTION, SEC_OID_SHA256, SHA256_LENGTH},
+	{SEC_OID_PKCS1_SHA1_WITH_RSA_ENCRYPTION, SEC_OID_SHA256, SHA256_LENGTH},
+	{SEC_OID_ISO_SHA_WITH_RSA_SIGNATURE, SEC_OID_SHA256, SHA256_LENGTH},
+	{SEC_OID_ISO_SHA1_WITH_RSA_SIGNATURE, SEC_OID_SHA256, SHA256_LENGTH},
+	{SEC_OID_PKCS5_PBE_WITH_MD5_AND_DES_CBC, SEC_OID_SHA256, SHA256_LENGTH},
+
+	{SEC_OID_ANSIX962_ECDSA_SHA224_SIGNATURE, SEC_OID_SHA224, SHA224_LENGTH},
+	{SEC_OID_PKCS1_SHA224_WITH_RSA_ENCRYPTION, SEC_OID_SHA224, SHA224_LENGTH},
+	{SEC_OID_NIST_DSA_SIGNATURE_WITH_SHA224_DIGEST, SEC_OID_SHA224, SHA224_LENGTH},
+
+	{SEC_OID_ANSIX962_ECDSA_SHA256_SIGNATURE, SEC_OID_SHA256, SHA256_LENGTH},
+	{SEC_OID_PKCS1_SHA256_WITH_RSA_ENCRYPTION, SEC_OID_SHA256, SHA256_LENGTH},
+	{SEC_OID_NIST_DSA_SIGNATURE_WITH_SHA256_DIGEST, SEC_OID_SHA256, SHA256_LENGTH},
+
+	{SEC_OID_ANSIX962_ECDSA_SHA384_SIGNATURE, SEC_OID_SHA384, SHA384_LENGTH},
+	{SEC_OID_PKCS1_SHA384_WITH_RSA_ENCRYPTION, SEC_OID_SHA384, SHA384_LENGTH},
+
+	{SEC_OID_ANSIX962_ECDSA_SHA512_SIGNATURE, SEC_OID_SHA512, SHA512_LENGTH},
+	{SEC_OID_PKCS1_SHA512_WITH_RSA_ENCRYPTION, SEC_OID_SHA512, SHA512_LENGTH},
+
+	{0, 0}
+};
+
+/*
+ * This list is a partial copy of the ciphers in NSS files lib/ssl/sslproto.h
+ * in order to provide a human readable version of the ciphers. It would be
+ * nice to not have to have this, but NSS doesn't provide any API addressing
+ * the ciphers by name. TODO: do we want more of the ciphers, or perhaps less?
+ */
+static const NSSCiphers NSS_CipherList[] = {
+
+	{"TLS_NULL_WITH_NULL_NULL", TLS_NULL_WITH_NULL_NULL},
+
+	{"TLS_RSA_WITH_NULL_MD5", TLS_RSA_WITH_NULL_MD5},
+	{"TLS_RSA_WITH_NULL_SHA", TLS_RSA_WITH_NULL_SHA},
+	{"TLS_RSA_WITH_RC4_128_MD5", TLS_RSA_WITH_RC4_128_MD5},
+	{"TLS_RSA_WITH_RC4_128_SHA", TLS_RSA_WITH_RC4_128_SHA},
+	{"TLS_RSA_WITH_IDEA_CBC_SHA", TLS_RSA_WITH_IDEA_CBC_SHA},
+	{"TLS_RSA_WITH_DES_CBC_SHA", TLS_RSA_WITH_DES_CBC_SHA},
+	{"TLS_RSA_WITH_3DES_EDE_CBC_SHA", TLS_RSA_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_DH_DSS_WITH_DES_CBC_SHA", TLS_DH_DSS_WITH_DES_CBC_SHA},
+	{"TLS_DH_DSS_WITH_3DES_EDE_CBC_SHA", TLS_DH_DSS_WITH_3DES_EDE_CBC_SHA},
+	{"TLS_DH_RSA_WITH_DES_CBC_SHA", TLS_DH_RSA_WITH_DES_CBC_SHA},
+	{"TLS_DH_RSA_WITH_3DES_EDE_CBC_SHA", TLS_DH_RSA_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_DHE_DSS_WITH_DES_CBC_SHA", TLS_DHE_DSS_WITH_DES_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_3DES_EDE_CBC_SHA", TLS_DHE_DSS_WITH_3DES_EDE_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_DES_CBC_SHA", TLS_DHE_RSA_WITH_DES_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA", TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_DH_anon_WITH_RC4_128_MD5", TLS_DH_anon_WITH_RC4_128_MD5},
+	{"TLS_DH_anon_WITH_DES_CBC_SHA", TLS_DH_anon_WITH_DES_CBC_SHA},
+	{"TLS_DH_anon_WITH_3DES_EDE_CBC_SHA", TLS_DH_anon_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_RSA_WITH_AES_128_CBC_SHA", TLS_RSA_WITH_AES_128_CBC_SHA},
+	{"TLS_DH_DSS_WITH_AES_128_CBC_SHA", TLS_DH_DSS_WITH_AES_128_CBC_SHA},
+	{"TLS_DH_RSA_WITH_AES_128_CBC_SHA", TLS_DH_RSA_WITH_AES_128_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_AES_128_CBC_SHA", TLS_DHE_DSS_WITH_AES_128_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_AES_128_CBC_SHA", TLS_DHE_RSA_WITH_AES_128_CBC_SHA},
+	{"TLS_DH_anon_WITH_AES_128_CBC_SHA", TLS_DH_anon_WITH_AES_128_CBC_SHA},
+
+	{"TLS_RSA_WITH_AES_256_CBC_SHA", TLS_RSA_WITH_AES_256_CBC_SHA},
+	{"TLS_DH_DSS_WITH_AES_256_CBC_SHA", TLS_DH_DSS_WITH_AES_256_CBC_SHA},
+	{"TLS_DH_RSA_WITH_AES_256_CBC_SHA", TLS_DH_RSA_WITH_AES_256_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_AES_256_CBC_SHA", TLS_DHE_DSS_WITH_AES_256_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_AES_256_CBC_SHA", TLS_DHE_RSA_WITH_AES_256_CBC_SHA},
+	{"TLS_DH_anon_WITH_AES_256_CBC_SHA", TLS_DH_anon_WITH_AES_256_CBC_SHA},
+	{"TLS_RSA_WITH_NULL_SHA256", TLS_RSA_WITH_NULL_SHA256},
+	{"TLS_RSA_WITH_AES_128_CBC_SHA256", TLS_RSA_WITH_AES_128_CBC_SHA256},
+	{"TLS_RSA_WITH_AES_256_CBC_SHA256", TLS_RSA_WITH_AES_256_CBC_SHA256},
+
+	{"TLS_DHE_DSS_WITH_AES_128_CBC_SHA256", TLS_DHE_DSS_WITH_AES_128_CBC_SHA256},
+	{"TLS_RSA_WITH_CAMELLIA_128_CBC_SHA", TLS_RSA_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DH_DSS_WITH_CAMELLIA_128_CBC_SHA", TLS_DH_DSS_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DH_RSA_WITH_CAMELLIA_128_CBC_SHA", TLS_DH_RSA_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_CAMELLIA_128_CBC_SHA", TLS_DHE_DSS_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA", TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DH_anon_WITH_CAMELLIA_128_CBC_SHA", TLS_DH_anon_WITH_CAMELLIA_128_CBC_SHA},
+
+	{"TLS_DHE_DSS_WITH_RC4_128_SHA", TLS_DHE_DSS_WITH_RC4_128_SHA},
+	{"TLS_DHE_RSA_WITH_AES_128_CBC_SHA256", TLS_DHE_RSA_WITH_AES_128_CBC_SHA256},
+	{"TLS_DHE_DSS_WITH_AES_256_CBC_SHA256", TLS_DHE_DSS_WITH_AES_256_CBC_SHA256},
+	{"TLS_DHE_RSA_WITH_AES_256_CBC_SHA256", TLS_DHE_RSA_WITH_AES_256_CBC_SHA256},
+
+	{"TLS_RSA_WITH_CAMELLIA_256_CBC_SHA", TLS_RSA_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DH_DSS_WITH_CAMELLIA_256_CBC_SHA", TLS_DH_DSS_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DH_RSA_WITH_CAMELLIA_256_CBC_SHA", TLS_DH_RSA_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_CAMELLIA_256_CBC_SHA", TLS_DHE_DSS_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA", TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DH_anon_WITH_CAMELLIA_256_CBC_SHA", TLS_DH_anon_WITH_CAMELLIA_256_CBC_SHA},
+
+	{"TLS_RSA_WITH_SEED_CBC_SHA", TLS_RSA_WITH_SEED_CBC_SHA},
+
+	{"TLS_RSA_WITH_AES_128_GCM_SHA256", TLS_RSA_WITH_AES_128_GCM_SHA256},
+	{"TLS_RSA_WITH_AES_256_GCM_SHA384", TLS_RSA_WITH_AES_256_GCM_SHA384},
+	{"TLS_DHE_RSA_WITH_AES_128_GCM_SHA256", TLS_DHE_RSA_WITH_AES_128_GCM_SHA256},
+	{"TLS_DHE_RSA_WITH_AES_256_GCM_SHA384", TLS_DHE_RSA_WITH_AES_256_GCM_SHA384},
+	{"TLS_DHE_DSS_WITH_AES_128_GCM_SHA256", TLS_DHE_DSS_WITH_AES_128_GCM_SHA256},
+	{"TLS_DHE_DSS_WITH_AES_256_GCM_SHA384", TLS_DHE_DSS_WITH_AES_256_GCM_SHA384},
+
+	{"TLS_AES_128_GCM_SHA256", TLS_AES_128_GCM_SHA256},
+	{"TLS_AES_256_GCM_SHA384", TLS_AES_256_GCM_SHA384},
+	{"TLS_CHACHA20_POLY1305_SHA256", TLS_CHACHA20_POLY1305_SHA256},
+	{NULL, 0}
+};
+
+/*
+ * pg_find_cipher
+ *			Translate an NSS ciphername to the cipher code
+ *
+ * Searches the configured ciphers for the corresponding cipher code to the
+ * name. Search is performed case insensitive.
+ */
+PRUint16
+pg_find_cipher(char *name)
+{
+	const		NSSCiphers *cipher_list = NSS_CipherList;
+
+	while (cipher_list->name)
+	{
+		if (pg_strcasecmp(cipher_list->name, name) == 0)
+			return cipher_list->number;
+
+		cipher_list++;
+	}
+
+	return 0xFFFF;
+}
+
+#endif							/* USE_NSS */
+
+#endif							/* PG_NSS_H */
diff --git a/src/include/libpq/libpq-be.h b/src/include/libpq/libpq-be.h
index 0a23281ad5..74f88b628e 100644
--- a/src/include/libpq/libpq-be.h
+++ b/src/include/libpq/libpq-be.h
@@ -192,13 +192,18 @@ typedef struct Port
 	bool		peer_cert_valid;
 
 	/*
-	 * OpenSSL structures. (Keep these last so that the locations of other
-	 * fields are the same whether or not you build with OpenSSL.)
+	 * SSL backend specific structures. (Keep these last so that the locations
+	 * of other fields are the same whether or not you build with SSL
+	 * enabled.)
 	 */
 #ifdef USE_OPENSSL
 	SSL		   *ssl;
 	X509	   *peer;
 #endif
+
+#ifdef USE_NSS
+	void	   *pr_fd;
+#endif
 } Port;
 
 #ifdef USE_SSL
@@ -282,7 +287,7 @@ extern void be_tls_get_peer_serial(Port *port, char *ptr, size_t len);
  * This is not supported with old versions of OpenSSL that don't have
  * the X509_get_signature_nid() function.
  */
-#if defined(USE_OPENSSL) && defined(HAVE_X509_GET_SIGNATURE_NID)
+#if defined(USE_NSS) || (defined(USE_OPENSSL) && defined(HAVE_X509_GET_SIGNATURE_NID))
 #define HAVE_BE_TLS_GET_CERTIFICATE_HASH
 extern char *be_tls_get_certificate_hash(Port *port, size_t *len);
 #endif
@@ -292,6 +297,10 @@ extern char *be_tls_get_certificate_hash(Port *port, size_t *len);
 typedef void (*openssl_tls_init_hook_typ) (SSL_CTX *context, bool isServerStart);
 extern PGDLLIMPORT openssl_tls_init_hook_typ openssl_tls_init_hook;
 #endif
+#ifdef USE_NSS
+typedef void (*nss_tls_init_hook_type) (bool isServerStart);
+extern PGDLLIMPORT nss_tls_init_hook_type nss_tls_init_hook;
+#endif
 
 #endif							/* USE_SSL */
 
diff --git a/src/include/libpq/libpq.h b/src/include/libpq/libpq.h
index b1152475ac..298d87ecae 100644
--- a/src/include/libpq/libpq.h
+++ b/src/include/libpq/libpq.h
@@ -88,6 +88,9 @@ extern PGDLLIMPORT bool ssl_passphrase_command_supports_reload;
 #ifdef USE_SSL
 extern bool ssl_loaded_verify_locations;
 #endif
+#ifdef USE_NSS
+extern char *ssl_database;
+#endif
 
 extern int	secure_initialize(bool isServerStart);
 extern bool secure_loaded_verify_locations(void);
diff --git a/src/include/pg_config.h.in b/src/include/pg_config.h.in
index fb270df678..31f808398c 100644
--- a/src/include/pg_config.h.in
+++ b/src/include/pg_config.h.in
@@ -893,6 +893,9 @@
 /* Define to 1 to build with PAM support. (--with-pam) */
 #undef USE_PAM
 
+/* Define to build with NSS support (--with-nss) */
+#undef USE_NSS
+
 /* Define to 1 to use software CRC-32C implementation (slicing-by-8). */
 #undef USE_SLICING_BY_8_CRC32C
 
diff --git a/src/include/pg_config_manual.h b/src/include/pg_config_manual.h
index 705dc69c06..c28b84126d 100644
--- a/src/include/pg_config_manual.h
+++ b/src/include/pg_config_manual.h
@@ -176,10 +176,9 @@
 
 /*
  * USE_SSL code should be compiled only when compiling with an SSL
- * implementation.  (Currently, only OpenSSL is supported, but we might add
- * more implementations in the future.)
+ * implementation.
  */
-#ifdef USE_OPENSSL
+#if defined(USE_OPENSSL) || defined(USE_NSS)
 #define USE_SSL
 #endif
 
diff --git a/src/interfaces/libpq/Makefile b/src/interfaces/libpq/Makefile
index 4ac5f4b340..e902f38c8e 100644
--- a/src/interfaces/libpq/Makefile
+++ b/src/interfaces/libpq/Makefile
@@ -45,12 +45,21 @@ OBJS = \
 	pqexpbuffer.o \
 	fe-auth.o
 
-ifeq ($(with_openssl),yes)
+ifneq ($(with_ssl),no)
+OBJS += \
+	fe-secure-common.o
+endif
+
+ifeq ($(with_ssl),openssl)
 OBJS += \
-	fe-secure-common.o \
 	fe-secure-openssl.o
 endif
 
+ifeq ($(with_ssl), nss)
+OBJS += \
+	fe-secure-nss.o
+endif
+
 ifeq ($(with_gssapi),yes)
 OBJS += \
 	fe-gssapi-common.o \
diff --git a/src/interfaces/libpq/fe-connect.c b/src/interfaces/libpq/fe-connect.c
index e7781d010f..8188401659 100644
--- a/src/interfaces/libpq/fe-connect.c
+++ b/src/interfaces/libpq/fe-connect.c
@@ -355,6 +355,10 @@ static const internalPQconninfoOption PQconninfoOptions[] = {
 		"Target-Session-Attrs", "", 11, /* sizeof("read-write") = 11 */
 	offsetof(struct pg_conn, target_session_attrs)},
 
+	{"cert_database", NULL, NULL, NULL,
+		"CertificateDatabase", "", 64,
+	offsetof(struct pg_conn, cert_database)},
+
 	/* Terminating entry --- MUST BE LAST */
 	{NULL, NULL, NULL, NULL,
 	NULL, NULL, 0}
diff --git a/src/interfaces/libpq/fe-secure-nss.c b/src/interfaces/libpq/fe-secure-nss.c
new file mode 100644
index 0000000000..3090f37f5e
--- /dev/null
+++ b/src/interfaces/libpq/fe-secure-nss.c
@@ -0,0 +1,1081 @@
+/*-------------------------------------------------------------------------
+ *
+ * fe-secure-nss.c
+ *	  functions for supporting NSS as a TLS backend for frontend libpq
+ *
+ * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ *	  src/interfaces/libpq/fe-secure-nss.c
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#include "postgres_fe.h"
+
+#include "libpq-fe.h"
+#include "fe-auth.h"
+#include "fe-secure-common.h"
+#include "libpq-int.h"
+#include "common/pg_nss.h"
+
+/*
+ * BITS_PER_BYTE is also defined in the NSPR header files, so we need to undef
+ * our version to avoid compiler warnings on redefinition.
+ */
+#define pg_BITS_PER_BYTE BITS_PER_BYTE
+#undef BITS_PER_BYTE
+
+/*
+ * The nspr/obsolete/protypes.h NSPR header typedefs uint64 and int64 with
+ * colliding definitions from ours, causing a much expected compiler error.
+ * Remove backwards compatibility with ancient NSPR versions to avoid this.
+ */
+#define NO_NSPR_10_SUPPORT
+#include <nspr/nspr.h>
+#include <nspr/prerror.h>
+#include <nspr/prinit.h>
+#include <nspr/prio.h>
+#include <nss/hasht.h>
+#include <nss/nss.h>
+#include <nss/ssl.h>
+#include <nss/sslproto.h>
+#include <nss/pk11func.h>
+#include <nss/secerr.h>
+#include <nss/secoidt.h>
+#include <nss/secmod.h>
+
+/*
+ * Ensure that the colliding definitions match, else throw an error. In case
+ * NSPR remove the definition in a future version (however unlikely that may
+ * be, make sure to put ours back again.
+ */
+#if defined(BITS_PER_BYTE)
+#if BITS_PER_BYTE != pg_BITS_PER_BYTE
+#error "incompatible byte widths between NSPR and PostgreSQL"
+#endif
+#else
+#define BITS_PER_BYTE pg_BITS_PER_BYTE
+#endif
+#undef pg_BITS_PER_BYTE
+
+static SECStatus pg_load_nss_module(SECMODModule * *module, const char *library, const char *name);
+static SECStatus pg_bad_cert_handler(void *arg, PRFileDesc * fd);
+static const char *pg_SSLerrmessage(PRErrorCode errcode);
+static SECStatus pg_client_auth_handler(void *arg, PRFileDesc * socket, CERTDistNames * caNames,
+										CERTCertificate * *pRetCert, SECKEYPrivateKey * *pRetKey);
+static SECStatus pg_cert_auth_handler(void *arg, PRFileDesc * fd, PRBool checksig, PRBool isServer);
+static int	ssl_protocol_version_to_nss(const char *protocol);
+static bool cert_database_has_CA(PGconn *conn);
+
+static char *PQssl_passwd_cb(PK11SlotInfo * slot, PRBool retry, void *arg);
+
+/*
+ * PR_ImportTCPSocket() is a private API, but very widely used, as it's the
+ * only way to make NSS use an already set up POSIX file descriptor rather
+ * than opening one itself. To quote the NSS documentation:
+ *
+ *		"In theory, code that uses PR_ImportTCPSocket may break when NSPR's
+ *		implementation changes. In practice, this is unlikely to happen because
+ *		NSPR's implementation has been stable for years and because of NSPR's
+ *		strong commitment to backward compatibility."
+ *
+ * https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSPR/Reference/PR_ImportTCPSocket
+ *
+ * The function is declared in <private/pprio.h>, but as it is a header marked
+ * private we declare it here rather than including it.
+ */
+NSPR_API(PRFileDesc *) PR_ImportTCPSocket(int);
+
+static SECMODModule * ca_trust = NULL;
+static NSSInitContext * nss_context = NULL;
+
+/*
+ * This logic exist in NSS as well, but it's only available for when there is
+ * a database to open, and not only using the system trust store. Thus, we
+ * need to keep our own copy.
+ */
+#if defined(WIN32)
+static const char *ca_trust_name = "nssckbi.dll";
+#elif defined(__darwin__)
+static const char *ca_trust_name = "libnssckbi.dylib";
+#else
+static const char *ca_trust_name = "libnssckbi.so";
+#endif
+
+static PQsslKeyPassHook_nss_type PQsslKeyPassHook = NULL;
+
+/* ------------------------------------------------------------ */
+/*			 Procedures common to all secure sessions			*/
+/* ------------------------------------------------------------ */
+
+/*
+ * pgtls_init_library
+ *
+ * There is no direct equivalent for PQinitOpenSSL in NSS/NSPR, with PR_Init
+ * being the closest match there is. PR_Init is however already documented to
+ * not be required so simply making this a noop seems like the best option.
+ */
+void
+pgtls_init_library(bool do_ssl, int do_crypto)
+{
+	/* noop */
+}
+
+int
+pgtls_init(PGconn *conn)
+{
+	conn->ssl_in_use = false;
+	conn->has_password = false;
+
+	return 0;
+}
+
+void
+pgtls_close(PGconn *conn)
+{
+	if (nss_context)
+	{
+		NSS_ShutdownContext(nss_context);
+		nss_context = NULL;
+	}
+}
+
+PostgresPollingStatusType
+pgtls_open_client(PGconn *conn)
+{
+	SECStatus	status;
+	PRFileDesc *pr_fd;
+	PRFileDesc *model;
+	NSSInitParameters params;
+	SSLVersionRange desired_range;
+
+	/*
+	 * The NSPR documentation states that runtime initialization via PR_Init
+	 * is no longer required, as the first caller into NSPR will perform the
+	 * initialization implicitly. See be-secure-nss.c for further discussion
+	 * on PR_Init.
+	 */
+	PR_Init(PR_USER_THREAD, PR_PRIORITY_NORMAL, 0);
+
+	/*
+	 * NSS initialization and the use of contexts is further discussed in
+	 * be-secure-nss.c
+	 */
+	memset(&params, 0, sizeof(params));
+	params.length = sizeof(params);
+
+	if (conn->cert_database && strlen(conn->cert_database) > 0)
+	{
+		char	   *cert_database_path = psprintf("sql:%s", conn->cert_database);
+
+		nss_context = NSS_InitContext(cert_database_path, "", "", "",
+									  &params,
+									  NSS_INIT_READONLY | NSS_INIT_PK11RELOAD);
+		pfree(cert_database_path);
+
+		if (!nss_context)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to open certificate database \"%s\": %s"),
+						  conn->cert_database,
+						  pg_SSLerrmessage(PR_GetError()));
+			return PGRES_POLLING_FAILED;
+		}
+	}
+	else
+	{
+		nss_context = NSS_InitContext("", "", "", "", &params,
+									  NSS_INIT_READONLY | NSS_INIT_NOCERTDB |
+									  NSS_INIT_NOMODDB | NSS_INIT_FORCEOPEN |
+									  NSS_INIT_NOROOTINIT | NSS_INIT_PK11RELOAD);
+		if (!nss_context)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("unable to create certificate database: %s"),
+							  pg_SSLerrmessage(PR_GetError()));
+			return PGRES_POLLING_FAILED;
+		}
+	}
+
+	/*
+	 * Configure cipher policy.
+	 */
+	status = NSS_SetDomesticPolicy();
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to configure cipher policy: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * If we don't have a certificate database, the system trust store is the
+	 * fallback we can use. If we fail to initialize that as well, we can
+	 * still attempt a connection as long as the sslmode isn't verify*.
+	 */
+	if (!conn->cert_database && conn->sslmode[0] == 'v')
+	{
+		status = pg_load_nss_module(&ca_trust, ca_trust_name, "\"Root Certificates\"");
+		if (status != SECSuccess)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("WARNING: unable to load NSS trust module \"%s\" : %s"),
+							  ca_trust_name,
+							  pg_SSLerrmessage(PR_GetError()));
+
+			return PGRES_POLLING_FAILED;
+		}
+	}
+
+
+	PK11_SetPasswordFunc(PQssl_passwd_cb);
+
+	/*
+	 * Import the already opened socket as we don't want to use NSPR functions
+	 * for opening the network socket due to how the PostgreSQL protocol works
+	 * with TLS connections. This function is not part of the NSPR public API,
+	 * see the comment at the top of the file for the rationale of still using
+	 * it.
+	 */
+	pr_fd = PR_ImportTCPSocket(conn->sock);
+	if (!pr_fd)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to attach to socket: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * Most of the documentation available, and implementations of, NSS/NSPR
+	 * use the PR_NewTCPSocket() function here, which has the drawback that it
+	 * can only create IPv4 sockets. Instead use PR_OpenTCPSocket() which
+	 * copes with IPv6 as well.
+	 */
+	model = SSL_ImportFD(NULL, PR_OpenTCPSocket(conn->laddr.addr.ss_family));
+	if (!model)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to enable TLS: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/* Disable old protocol versions (SSLv2 and SSLv3) */
+	SSL_OptionSet(model, SSL_ENABLE_SSL2, PR_FALSE);
+	SSL_OptionSet(model, SSL_V2_COMPATIBLE_HELLO, PR_FALSE);
+	SSL_OptionSet(model, SSL_ENABLE_SSL3, PR_FALSE);
+
+#ifdef SSL_CBC_RANDOM_IV
+	/*
+	 * Enable protection against the BEAST attack in case the NSS library has
+	 * support for that. While SSLv3 is disabled, we may still allow TLSv1
+	 * which is affected. The option isn't documented as an SSL option, but as
+	 * an NSS environment variable.
+	 */
+	SSL_OptionSet(model, SSL_CBC_RANDOM_IV, PR_TRUE);
+#endif
+
+	/* Set us up as a TLS client for the handshake */
+	SSL_OptionSet(model, SSL_HANDSHAKE_AS_CLIENT, PR_TRUE);
+
+	/*
+	 * When setting the available protocols, we either use the user defined
+	 * configuration values, and if missing we accept whatever is the highest
+	 * version supported by the library as the max and only limit the range in
+	 * the other end at TLSv1.0. ssl_variant_stream is a ProtocolVariant enum
+	 * for Stream protocols, rather than datagram.
+	 */
+	SSL_VersionRangeGetSupported(ssl_variant_stream, &desired_range);
+	desired_range.min = SSL_LIBRARY_VERSION_TLS_1_0;
+
+	if (conn->ssl_min_protocol_version && strlen(conn->ssl_min_protocol_version) > 0)
+	{
+		int			ssl_min_ver = ssl_protocol_version_to_nss(conn->ssl_min_protocol_version);
+
+		if (ssl_min_ver == -1)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("invalid value \"%s\" for minimum version of SSL protocol\n"),
+							  conn->ssl_min_protocol_version);
+			return -1;
+		}
+
+		desired_range.min = ssl_min_ver;
+	}
+
+	if (conn->ssl_max_protocol_version && strlen(conn->ssl_max_protocol_version) > 0)
+	{
+		int			ssl_max_ver = ssl_protocol_version_to_nss(conn->ssl_max_protocol_version);
+
+		if (ssl_max_ver == -1)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("invalid value \"%s\" for maximum version of SSL protocol\n"),
+							  conn->ssl_max_protocol_version);
+			return -1;
+		}
+
+		desired_range.max = ssl_max_ver;
+	}
+
+	if (SSL_VersionRangeSet(model, &desired_range) != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to set allowed SSL protocol version range: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * Set up callback for verifying server certificates, as well as for how
+	 * to handle failed verifications.
+	 */
+	SSL_AuthCertificateHook(model, pg_cert_auth_handler, (void *) conn);
+	SSL_BadCertHook(model, pg_bad_cert_handler, (void *) conn);
+
+	/*
+	 * Convert the NSPR socket to an SSL socket. Ensuring the success of this
+	 * operation is critical as NSS SSL_* functions may return SECSuccess on
+	 * the socket even though SSL hasn't been enabled, which introduce a risk
+	 * of silent downgrades.
+	 */
+	conn->pr_fd = SSL_ImportFD(model, pr_fd);
+	if (!conn->pr_fd)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to configure client for TLS: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * The model can now we closed as we've applied the settings of the model
+	 * onto the real socket. From hereon we should only use conn->pr_fd.
+	 */
+	PR_Close(model);
+
+	/* Set the private data to be passed to the password callback */
+	SSL_SetPKCS11PinArg(conn->pr_fd, (void *) conn);
+
+	/*
+	 * If a CRL file has been specified, verify if it exists in the database
+	 * but don't fail in case it doesn't.
+	 */
+	if (conn->sslcrl && strlen(conn->sslcrl) > 0)
+	{
+		/* XXX: Implement me.. */
+	}
+
+	status = SSL_ResetHandshake(conn->pr_fd, PR_FALSE);
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to initiate handshake: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * Set callback for client authentication when requested by the server.
+	 */
+	SSL_GetClientAuthDataHook(conn->pr_fd, pg_client_auth_handler, (void *) conn);
+
+	/*
+	 * Specify which hostname we are expecting to talk to. This is required,
+	 * albeit mostly applies to when opening a connection to a traditional
+	 * http server it seems.
+	 */
+	SSL_SetURL(conn->pr_fd, (conn->connhost[conn->whichhost]).host);
+
+	do
+	{
+		status = SSL_ForceHandshake(conn->pr_fd);
+	}
+	while (status != SECSuccess && PR_GetError() == PR_WOULD_BLOCK_ERROR);
+
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("SSL error: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	conn->ssl_in_use = true;
+	return PGRES_POLLING_OK;
+}
+
+ssize_t
+pgtls_read(PGconn *conn, void *ptr, size_t len)
+{
+	PRInt32		nread;
+	PRErrorCode status;
+	int			read_errno = 0;
+
+	/*
+	 * PR_Recv blocks until there is data to read or the timeout expires. We
+	 * don't want to sit blocked here, so the timeout is turned off by using
+	 * PR_INTERVAL_NO_WAIT which means "return immediately",  Zero is returned
+	 * for closed connections, while -1 indicates an error within the ongoing
+	 * connection.
+	 */
+	nread = PR_Recv(conn->pr_fd, ptr, len, 0, PR_INTERVAL_NO_WAIT);
+
+	if (nread == 0)
+	{
+		read_errno = ECONNRESET;
+		return -1;
+	}
+
+	if (nread == -1)
+	{
+		status = PR_GetError();
+
+		switch (status)
+		{
+			case PR_WOULD_BLOCK_ERROR:
+				read_errno = EWOULDBLOCK;
+				break;
+
+				/*
+				 * The error cases for PR_Recv are not documented, but can be
+				 * reverse engineered from _MD_unix_map_default_error() in the
+				 * NSPR code, defined in pr/src/md/unix/unix_errors.c.
+				 */
+			case PR_NETWORK_UNREACHABLE_ERROR:
+			case PR_CONNECT_RESET_ERROR:
+				read_errno = ECONNRESET;
+				break;
+
+			default:
+				break;
+		}
+
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("TLS read error: %s"),
+						  pg_SSLerrmessage(status));
+	}
+
+	SOCK_ERRNO_SET(read_errno);
+	return (ssize_t) nread;
+}
+
+/*
+ * pgtls_read_pending
+ *		Check for the existence of data to be read.
+ *
+ * This is part of the PostgreSQL TLS backend API.
+ */
+bool
+pgtls_read_pending(PGconn *conn)
+{
+	unsigned char c;
+	int			n;
+
+	/*
+	 * PR_Recv peeks into the stream with the timeount turned off, to see if
+	 * there is another byte to read off the wire. There is an NSS function
+	 * SSL_DataPending() which might seem like a better fit, but it will only
+	 * check already encrypted data in the SSL buffer, not still unencrypted
+	 * data, thus it doesn't guarantee that a subsequent call to
+	 * PR_Read/PR_Recv wont block.
+	 */
+	n = PR_Recv(conn->pr_fd, &c, 1, PR_MSG_PEEK, PR_INTERVAL_NO_WAIT);
+	return (n > 0);
+}
+
+ssize_t
+pgtls_write(PGconn *conn, const void *ptr, size_t len)
+{
+	PRInt32		n;
+	PRErrorCode status;
+	int			write_errno = 0;
+
+	n = PR_Write(conn->pr_fd, ptr, len);
+
+	if (n < 0)
+	{
+		status = PR_GetError();
+
+		switch (status)
+		{
+			case PR_WOULD_BLOCK_ERROR:
+#ifdef EAGAIN
+				write_errno = EAGAIN;
+#else
+				write_errno = EINTR;
+#endif
+				break;
+
+			default:
+				printfPQExpBuffer(&conn->errorMessage,
+								  libpq_gettext("TLS write error: %s"),
+								  pg_SSLerrmessage(status));
+				write_errno = ECONNRESET;
+				break;
+		}
+	}
+
+	SOCK_ERRNO_SET(write_errno);
+	return (ssize_t) n;
+}
+
+char *
+pgtls_get_peer_certificate_hash(PGconn *conn, size_t *len)
+{
+	CERTCertificate	*server_cert;
+	SECOidTag		signature_alg;
+	SECOidTag		digest_alg;
+	int				digest_len;
+	PLArenaPool	   *arena;
+	SECItem			digest;
+	char		   *ret;
+	SECStatus		status;
+
+	*len = 0;
+
+	server_cert = SSL_PeerCertificate(conn->pr_fd);
+	if (!server_cert)
+		return NULL;
+
+	signature_alg = SECOID_GetAlgorithmTag(&server_cert->signature);
+	digest_alg = SEC_OID_SHA256;
+	digest_len = SHA256_LENGTH;
+
+	while (NSS_SCRAMDigestAlgorithm->signature)
+	{
+		if (signature_alg == NSS_SCRAMDigestAlgorithm->signature)
+		{
+			digest_alg = NSS_SCRAMDigestAlgorithm->hash;
+			digest_len = NSS_SCRAMDigestAlgorithm->len;
+			break;
+		}
+	}
+
+	arena = PORT_NewArena(SEC_ASN1_DEFAULT_ARENA_SIZE);
+	digest.data = PORT_ArenaZAlloc(arena, sizeof(unsigned char) * digest_len);
+	digest.len = digest_len;
+
+	status = PK11_HashBuf(digest_alg, digest.data, server_cert->derCert.data,
+						  server_cert->derCert.len);
+
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to generate peer certificate digest: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		PORT_FreeArena(arena, PR_TRUE);
+		return NULL;
+	}
+
+	ret = pg_malloc(digest.len);
+	memcpy(ret, digest.data, digest.len);
+	*len = digest_len;
+	PORT_FreeArena(arena, PR_TRUE);
+
+	return ret;
+}
+
+/*
+ *	Verify that the server certificate matches the hostname we connected to.
+ *
+ * The certificate's Common Name and Subject Alternative Names are considered.
+ */
+int
+pgtls_verify_peer_name_matches_certificate_guts(PGconn *conn,
+												int *names_examined,
+												char **first_name)
+{
+	char		   *server_hostname = NULL;
+	CERTCertificate *server_cert = NULL;
+	SECStatus status = SECSuccess;
+	SECItem			altname_item;
+	PLArenaPool	   *arena = NULL;
+	CERTGeneralName *san_list;
+	CERTGeneralName *cn;
+
+	server_hostname = SSL_RevealURL(conn->pr_fd);
+	if (!server_hostname || server_hostname[0] == '\0')
+		goto done;
+
+	/*
+	 * CERT_VerifyCertName will internally perform RFC 2818 SubjectAltName
+	 * verification.
+	 */
+	server_cert = SSL_PeerCertificate(conn->pr_fd);
+	status = CERT_VerifyCertName(server_cert, server_hostname);
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to verify server hostname: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		goto done;
+	}
+
+	status = CERT_FindCertExtension(server_cert, SEC_OID_X509_SUBJECT_ALT_NAME,
+									&altname_item);
+	if (status == SECSuccess)
+	{
+		arena = PORT_NewArena(DER_DEFAULT_CHUNKSIZE);
+		if (!arena)
+		{
+			status = SECFailure;
+			goto done;
+		}
+		san_list = CERT_DecodeAltNameExtension(arena, &altname_item);
+		if (!san_list)
+		{
+			status = SECFailure;
+			goto done;
+		}
+
+		for (cn = san_list; cn != san_list; cn = CERT_GetNextGeneralName(cn))
+		{
+			char	   *alt_name;
+			int			rv;
+			char		tmp[512];
+
+			status = CERT_RFC1485_EscapeAndQuote(tmp, sizeof(tmp),
+												 (char *) cn->name.other.data,
+												 cn->name.other.len);
+
+			if (status != SECSuccess)
+				goto done;
+
+			rv = pq_verify_peer_name_matches_certificate_name(conn, tmp,
+															  strlen(tmp),
+															  &alt_name);
+			if (alt_name)
+			{
+				if (!*first_name)
+					*first_name = alt_name;
+				else
+					free(alt_name);
+			}
+
+			if (rv == 1)
+				status = SECSuccess;
+			else
+			{
+				status = SECFailure;
+				break;
+			}
+		}
+	}
+	else if (PORT_GetError() == SEC_ERROR_EXTENSION_NOT_FOUND)
+		status = SECSuccess;
+	else
+		status = SECSuccess;
+
+done:
+	/* san_list will be freed by freeing the arena it was allocated in */
+	if (arena)
+		PORT_FreeArena(arena, PR_TRUE);
+	PR_Free(server_hostname);
+
+	if (status == SECSuccess)
+		return 1;
+
+	return 0;
+}
+
+/* ------------------------------------------------------------ */
+/*			PostgreSQL specific TLS support functions			*/
+/* ------------------------------------------------------------ */
+
+static const char *
+pg_SSLerrmessage(PRErrorCode errcode)
+{
+	const char *error;
+
+	error = PR_ErrorToName(errcode);
+	if (error)
+		return error;
+
+	return "unknown TLS error";
+}
+
+static SECStatus
+pg_load_nss_module(SECMODModule * *module, const char *library, const char *name)
+{
+	SECMODModule *mod;
+	char	   *modulespec;
+
+	modulespec = psprintf("library=\"%s\", name=\"%s\"", library, name);
+
+	/*
+	 * Attempt to load the specified module. The second parameter is "parent"
+	 * which should always be NULL for application code. The third parameter
+	 * defines if loading should recurse which is only applicable when loading
+	 * a module from within another module. This hierarchy would have to be
+	 * defined in the modulespec, and since we don't support anything but
+	 * directly addressed modules we should pass PR_FALSE.
+	 */
+	mod = SECMOD_LoadUserModule(modulespec, NULL, PR_FALSE);
+	pfree(modulespec);
+
+	if (mod && mod->loaded)
+	{
+		*module = mod;
+		return SECSuccess;
+	}
+
+	SECMOD_DestroyModule(mod);
+	return SECFailure;
+}
+
+/* ------------------------------------------------------------ */
+/*						NSS Callbacks							*/
+/* ------------------------------------------------------------ */
+
+/*
+ * pg_cert_auth_handler
+ *			Callback for authenticating server certificate
+ *
+ * This is pretty much the same procedure as the SSL_AuthCertificate function
+ * provided by NSS, with the difference being server hostname validation. With
+ * SSL_AuthCertificate there is no way to do verify-ca, it only does the -full
+ * flavor of our sslmodes, so we need our own implementation.
+ */
+static SECStatus
+pg_cert_auth_handler(void *arg, PRFileDesc *fd, PRBool checksig, PRBool isServer)
+{
+	SECStatus	status;
+	PGconn	   *conn = (PGconn *) arg;
+	CERTCertificate *server_cert;
+	void	   *pin;
+
+	Assert(!isServer);
+
+	pin = SSL_RevealPinArg(conn->pr_fd);
+	server_cert = SSL_PeerCertificate(conn->pr_fd);
+
+	status = CERT_VerifyCertificateNow((CERTCertDBHandle *) CERT_GetDefaultCertDB(),
+									   server_cert,
+									   checksig,
+									   certificateUsageSSLServer,
+									   pin,
+									   NULL);
+
+	/*
+	 * If we've already failed validation then there is no point in also
+	 * performing the hostname check for verify-full.
+	 */
+	if (status == SECSuccess)
+	{
+		if (!pq_verify_peer_name_matches_certificate(conn))
+			status = SECFailure;
+	}
+	else
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to verify certificate: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+	}
+
+	return status;
+}
+
+/*
+ * pg_client_auth_handler
+ *		Callback for client certificate validation
+ *
+ * The client auth callback is not on by default in NSS, so we need to invoke
+ * it ourselves to ensure we can do cert authentication. A TODO is to support
+ * running without a specified sslcert parameter. By retrieving all the certs
+ * via nickname from the cert database and see if we find one which apply with
+ * NSS_CmpCertChainWCANames() and PK11_FindKeyByAnyCert() we could support
+ * just running with a ssl database specified.
+ *
+ * For now, we use the default client certificate validation which requires a
+ * defined nickname to identify the cert in the database.
+ */
+static SECStatus
+pg_client_auth_handler(void *arg, PRFileDesc * socket, CERTDistNames * caNames,
+					   CERTCertificate * *pRetCert, SECKEYPrivateKey * *pRetKey)
+{
+	PGconn	   *conn = (PGconn *) arg;
+
+	return NSS_GetClientAuthData(conn->sslcert, socket, caNames, pRetCert, pRetKey);
+}
+
+/*
+ * pg_bad_cert_handler
+ *		Callback for failed certificate validation
+ *
+ * The TLS handshake will call this function iff the server certificate failed
+ * validation. Depending on the sslmode, we allow the connection anyways.
+ */
+static SECStatus
+pg_bad_cert_handler(void *arg, PRFileDesc * fd)
+{
+	PGconn	   *conn = (PGconn *) arg;
+	PRErrorCode err;
+
+	/*
+	 * This really shouldn't happen, as we've the the PGconn object as our
+	 * callback data, and at the callsite we know it will be populated. That
+	 * being said, the NSS code itself performs this check even when it should
+	 * not be required so let's use the same belts with our suspenders.
+	 */
+	if (!arg)
+		return SECFailure;
+
+	/*
+	 * For sslmodes other than verify-full and verify-ca we don't perform peer
+	 * validation, so return immediately.  sslmode require with a database
+	 * specified which contains a CA certificate will work like verify-ca to
+	 * be compatible with the OpenSSL implementation.
+	 */
+	if (strcmp(conn->sslmode, "require") == 0)
+	{
+		if (conn->cert_database && strlen(conn->cert_database) > 0 && cert_database_has_CA(conn))
+			return SECFailure;
+	}
+	if (conn->sslmode[0] == 'v')
+		return SECFailure;
+
+	err = PORT_GetError();
+
+	/*
+	 * TODO: these are relevant error codes that can occur in certificate
+	 * validation, figure out which we dont want for require/prefer etc.
+	 */
+	switch (err)
+	{
+		case SEC_ERROR_INVALID_AVA:
+		case SEC_ERROR_INVALID_TIME:
+		case SEC_ERROR_BAD_SIGNATURE:
+		case SEC_ERROR_EXPIRED_CERTIFICATE:
+		case SEC_ERROR_UNKNOWN_ISSUER:
+		case SEC_ERROR_UNTRUSTED_ISSUER:
+		case SEC_ERROR_UNTRUSTED_CERT:
+		case SEC_ERROR_CERT_VALID:
+		case SEC_ERROR_EXPIRED_ISSUER_CERTIFICATE:
+		case SEC_ERROR_CRL_EXPIRED:
+		case SEC_ERROR_CRL_BAD_SIGNATURE:
+		case SEC_ERROR_EXTENSION_VALUE_INVALID:
+		case SEC_ERROR_CA_CERT_INVALID:
+		case SEC_ERROR_CERT_USAGES_INVALID:
+		case SEC_ERROR_UNKNOWN_CRITICAL_EXTENSION:
+			return SECSuccess;
+			break;
+		default:
+			return SECFailure;
+			break;
+	}
+
+	/* Unreachable */
+	return SECSuccess;
+}
+
+/* ------------------------------------------------------------ */
+/*					SSL information functions					*/
+/* ------------------------------------------------------------ */
+
+/*
+ * PQgetssl
+ *
+ * Return NULL as this is legacy and defined to always be equal to calling
+ * PQsslStruct(conn, "OpenSSL"); This should ideally trigger a logged warning
+ * somewhere as it's nonsensical to run in a non-OpenSSL build, but the color
+ * of said bikeshed hasn't yet been determined.
+ */
+void *
+PQgetssl(PGconn *conn)
+{
+	return NULL;
+}
+
+void *
+PQsslStruct(PGconn *conn, const char *struct_name)
+{
+	if (!conn)
+		return NULL;
+
+	/*
+	 * Return the underlying PRFileDesc which can be used to access
+	 * information on the connection details. There is no SSL context per se.
+	 */
+	if (strcmp(struct_name, "NSS") == 0)
+		return conn->pr_fd;
+	return NULL;
+}
+
+const char *const *
+PQsslAttributeNames(PGconn *conn)
+{
+	static const char *const result[] = {
+		"library",
+		"cipher",
+		"protocol",
+		"key_bits",
+		"compression",
+		NULL
+	};
+
+	return result;
+}
+
+const char *
+PQsslAttribute(PGconn *conn, const char *attribute_name)
+{
+	SECStatus	status;
+	SSLChannelInfo channel;
+	SSLCipherSuiteInfo suite;
+
+	if (!conn || !conn->pr_fd)
+		return NULL;
+
+	if (strcmp(attribute_name, "library") == 0)
+		return "NSS";
+
+	status = SSL_GetChannelInfo(conn->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+		return NULL;
+
+	status = SSL_GetCipherSuiteInfo(channel.cipherSuite, &suite, sizeof(suite));
+	if (status != SECSuccess)
+		return NULL;
+
+	if (strcmp(attribute_name, "cipher") == 0)
+		return suite.cipherSuiteName;
+
+	if (strcmp(attribute_name, "key_bits") == 0)
+	{
+		static char key_bits_str[8];
+
+		snprintf(key_bits_str, sizeof(key_bits_str), "%i", suite.effectiveKeyBits);
+		return key_bits_str;
+	}
+
+	if (strcmp(attribute_name, "protocol") == 0)
+	{
+		switch (channel.protocolVersion)
+		{
+#ifdef SSL_LIBRARY_VERSION_TLS_1_3
+			case SSL_LIBRARY_VERSION_TLS_1_3:
+				return "TLSv1.3";
+#endif
+#ifdef SSL_LIBRARY_VERSION_TLS_1_2
+			case SSL_LIBRARY_VERSION_TLS_1_2:
+				return "TLSv1.2";
+#endif
+#ifdef SSL_LIBRARY_VERSION_TLS_1_1
+			case SSL_LIBRARY_VERSION_TLS_1_1:
+				return "TLSv1.1";
+#endif
+			case SSL_LIBRARY_VERSION_TLS_1_0:
+				return "TLSv1.0";
+			default:
+				return "unknown";
+		}
+	}
+
+	/*
+	 * NSS disabled support for compression in version 3.33, and it was only
+	 * available for SSLv3 at that point anyways, so we can safely return off
+	 * here without checking.
+	 */
+	if (strcmp(attribute_name, "compression") == 0)
+		return "off";
+
+	return NULL;
+}
+
+static int
+ssl_protocol_version_to_nss(const char *protocol)
+{
+	if (pg_strcasecmp("TLSv1", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_0;
+
+#ifdef SSL_LIBRARY_VERSION_TLS_1_1
+	if (pg_strcasecmp("TLSv1.1", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_1;
+#endif
+
+#ifdef SSL_LIBRARY_VERSION_TLS_1_2
+	if (pg_strcasecmp("TLSv1.2", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_2;
+#endif
+
+#ifdef SSL_LIBRARY_VERSION_TLS_1_3
+	if (pg_strcasecmp("TLSv1.3", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_3;
+#endif
+
+	return -1;
+}
+
+static bool
+cert_database_has_CA(PGconn *conn)
+{
+	CERTCertList *certificates;
+	bool		hasCA;
+
+	/*
+	 * If the certificate database has a password we must provide it, since
+	 * this API doesn't invoke the standard password callback.
+	 */
+	if (conn->has_password)
+		certificates = PK11_ListCerts(PK11CertListCA, PQssl_passwd_cb(NULL, PR_FALSE, (void *) conn));
+	else
+		certificates = PK11_ListCerts(PK11CertListCA, NULL);
+	hasCA = !CERT_LIST_EMPTY(certificates);
+	CERT_DestroyCertList(certificates);
+
+	return hasCA;
+}
+
+PQsslKeyPassHook_nss_type
+PQgetSSLKeyPassHook_nss(void)
+{
+	return PQsslKeyPassHook;
+}
+
+void
+PQsetSSLKeyPassHook_nss(PQsslKeyPassHook_nss_type hook)
+{
+	PQsslKeyPassHook = hook;
+}
+
+/*
+ * Supply a password to decrypt a client certificate.
+ *
+ * This must match NSS type PK11PasswordFunc.
+ */
+static char *
+PQssl_passwd_cb(PK11SlotInfo * slot, PRBool retry, void *arg)
+{
+	PGconn	   *conn = (PGconn *) arg;
+
+	conn->has_password = true;
+
+	if (PQsslKeyPassHook)
+		return PQsslKeyPassHook(slot, (PRBool) retry, arg);
+	else
+		return PQdefaultSSLKeyPassHook_nss(slot, retry, arg);
+}
+
+/*
+ * The default password handler callback.
+ */
+char *
+PQdefaultSSLKeyPassHook_nss(PK11SlotInfo * slot, PRBool retry, void *arg)
+{
+	PGconn	   *conn = (PGconn *) arg;
+
+	/*
+	 * If the password didn't work the first time there is no point in
+	 * retrying as it hasn't changed.
+	 */
+	if (retry != PR_TRUE && conn->sslpassword && strlen(conn->sslpassword) > 0)
+		return PORT_Strdup(conn->sslpassword);
+
+	return NULL;
+}
diff --git a/src/interfaces/libpq/fe-secure.c b/src/interfaces/libpq/fe-secure.c
index 97c3805303..dd6ee15c5a 100644
--- a/src/interfaces/libpq/fe-secure.c
+++ b/src/interfaces/libpq/fe-secure.c
@@ -427,6 +427,9 @@ PQsslAttributeNames(PGconn *conn)
 
 	return result;
 }
+#endif /* USE_SSL */
+
+#ifndef USE_OPENSSL
 
 PQsslKeyPassHook_OpenSSL_type
 PQgetSSLKeyPassHook_OpenSSL(void)
@@ -445,7 +448,7 @@ PQdefaultSSLKeyPassHook_OpenSSL(char *buf, int size, PGconn *conn)
 {
 	return 0;
 }
-#endif							/* USE_SSL */
+#endif							/* USE_OPENSSL */
 
 /* Dummy version of GSSAPI information functions, when built without GSS support */
 #ifndef ENABLE_GSS
diff --git a/src/interfaces/libpq/libpq-fe.h b/src/interfaces/libpq/libpq-fe.h
index 3b6a9fbce3..27c16e187f 100644
--- a/src/interfaces/libpq/libpq-fe.h
+++ b/src/interfaces/libpq/libpq-fe.h
@@ -625,6 +625,17 @@ extern PQsslKeyPassHook_OpenSSL_type PQgetSSLKeyPassHook_OpenSSL(void);
 extern void PQsetSSLKeyPassHook_OpenSSL(PQsslKeyPassHook_OpenSSL_type hook);
 extern int	PQdefaultSSLKeyPassHook_OpenSSL(char *buf, int size, PGconn *conn);
 
+/* == in fe-secure-nss.c === */
+typedef struct PK11SlotInfoStr PK11SlotInfo;
+typedef int PRIntn;
+typedef PRIntn PRBool;
+
+/* Support for overriding sslpassword handling with a callback. */
+typedef char *(*PQsslKeyPassHook_nss_type) (PK11SlotInfo * slot, PRBool retry, void *arg);
+extern PQsslKeyPassHook_nss_type PQgetSSLKeyPassHook_nss(void);
+extern void PQsetSSLKeyPassHook_nss(PQsslKeyPassHook_nss_type hook);
+extern char *PQdefaultSSLKeyPassHook_nss(PK11SlotInfo * slot, PRBool retry, void *arg);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/src/interfaces/libpq/libpq-int.h b/src/interfaces/libpq/libpq-int.h
index 1de91ae295..5d9326490a 100644
--- a/src/interfaces/libpq/libpq-int.h
+++ b/src/interfaces/libpq/libpq-int.h
@@ -362,6 +362,7 @@ struct pg_conn
 	char	   *sslpassword;	/* client key file password */
 	char	   *sslrootcert;	/* root certificate filename */
 	char	   *sslcrl;			/* certificate revocation list filename */
+	char	   *cert_database;	/* NSS certificate/key database */
 	char	   *requirepeer;	/* required peer credentials for local sockets */
 	char	   *gssencmode;		/* GSS mode (require,prefer,disable) */
 	char	   *krbsrvname;		/* Kerberos service name */
@@ -485,6 +486,21 @@ struct pg_conn
 								 * OpenSSL version changes */
 #endif
 #endif							/* USE_OPENSSL */
+
+#ifdef USE_NSS
+	void	   *pr_fd;			/* NSPR file descriptor for the connection */
+	/*
+	 * Track whether the NSS database has a password set or not. There is no
+	 * API function for retrieving password status of a database, but we need
+	 * to know since some NSS API calls require the password passed in (they
+	 * don't call the callback themselves). To track, we simply flip this to
+	 * true in case NSS invoked the password callback - as that will only
+	 * happen in case there is a password. The reason for tracking this is that
+	 * there are calls which require a password parameter, but doesn't use the
+	 * callbacks provided, so we must call the callback on behalf of these.
+	 */
+	bool		has_password;
+#endif							/* USE_NSS */
 #endif							/* USE_SSL */
 
 #ifdef ENABLE_GSS
@@ -755,7 +771,7 @@ extern ssize_t pgtls_write(PGconn *conn, const void *ptr, size_t len);
  * This is not supported with old versions of OpenSSL that don't have
  * the X509_get_signature_nid() function.
  */
-#if defined(USE_OPENSSL) && defined(HAVE_X509_GET_SIGNATURE_NID)
+#if defined(USE_NSS) || (defined(USE_OPENSSL) && defined(HAVE_X509_GET_SIGNATURE_NID))
 #define HAVE_PGTLS_GET_PEER_CERTIFICATE_HASH
 extern char *pgtls_get_peer_certificate_hash(PGconn *conn, size_t *len);
 #endif
diff --git a/src/tools/msvc/Mkvcbuild.pm b/src/tools/msvc/Mkvcbuild.pm
index 90594bd41b..29879b51af 100644
--- a/src/tools/msvc/Mkvcbuild.pm
+++ b/src/tools/msvc/Mkvcbuild.pm
@@ -192,12 +192,19 @@ sub mkvcbuild
 	$postgres->FullExportDLL('postgres.lib');
 
 	# The OBJS scraper doesn't know about ifdefs, so remove appropriate files
-	# if building without OpenSSL.
-	if (!$solution->{options}->{openssl})
+	# if building without various options.
+	if (!$solution->{options}->{openssl} && !$solution->{options}->{nss})
 	{
 		$postgres->RemoveFile('src/backend/libpq/be-secure-common.c');
+	}
+	if (!$solution->{options}->{openssl})
+	{
 		$postgres->RemoveFile('src/backend/libpq/be-secure-openssl.c');
 	}
+	if (!$solution->{options}->{nss})
+	{
+		$postgres->RemoveFile('src/backend/libpq/be-secure-nss.c');
+	}
 	if (!$solution->{options}->{gss})
 	{
 		$postgres->RemoveFile('src/backend/libpq/be-gssapi-common.c');
@@ -255,12 +262,19 @@ sub mkvcbuild
 	$libpq->AddReference($libpgcommon, $libpgport);
 
 	# The OBJS scraper doesn't know about ifdefs, so remove appropriate files
-	# if building without OpenSSL.
-	if (!$solution->{options}->{openssl})
+	# if building without various options
+	if (!$solution->{options}->{openssl} && !$solution->{options}->{nss})
 	{
 		$libpq->RemoveFile('src/interfaces/libpq/fe-secure-common.c');
+	}
+	if (!$solution->{options}->{openssl})
+	{
 		$libpq->RemoveFile('src/interfaces/libpq/fe-secure-openssl.c');
 	}
+	if (!$solution->{options}->{nss})
+	{
+		$libpq->RemoveFile('src/interfaces/libpq/fe-secure-nss.c');
+	}
 	if (!$solution->{options}->{gss})
 	{
 		$libpq->RemoveFile('src/interfaces/libpq/fe-gssapi-common.c');
diff --git a/src/tools/msvc/Solution.pm b/src/tools/msvc/Solution.pm
index bc8904732f..ac11d9ab26 100644
--- a/src/tools/msvc/Solution.pm
+++ b/src/tools/msvc/Solution.pm
@@ -484,6 +484,7 @@ sub GenerateFiles
 		USE_NAMED_POSIX_SEMAPHORES => undef,
 		USE_OPENSSL                => undef,
 		USE_OPENSSL_RANDOM         => undef,
+		USE_NSS                    => undef,
 		USE_PAM                    => undef,
 		USE_SLICING_BY_8_CRC32C    => undef,
 		USE_SSE42_CRC32C           => undef,
@@ -537,6 +538,10 @@ sub GenerateFiles
 			$define{HAVE_OPENSSL_INIT_SSL}      = 1;
 		}
 	}
+	if ($self->{options}->{nss})
+	{
+		$define{USE_NSS} = 1;
+	}
 
 	$self->GenerateConfigHeader('src/include/pg_config.h',     \%define, 1);
 	$self->GenerateConfigHeader('src/include/pg_config_ext.h', \%define, 0);
@@ -1004,6 +1009,21 @@ sub AddProject
 			}
 		}
 	}
+	if ($self->{options}->{nss})
+	{
+		$proj->AddIncludeDir($self->{options}->{nss} . '\..\public\nss');
+		$proj->AddIncludeDir($self->{options}->{nss} . '\include\nspr');
+		foreach my $lib (qw(plds4 plc4 nspr4))
+		{
+			$proj->AddLibrary($self->{options}->{nss} .
+							  '\lib\lib' . "$lib.lib", 0);
+		}
+		foreach my $lib (qw(ssl3 smime3 nss3))
+		{
+			$proj->AddLibrary($self->{options}->{nss} .
+							  '\lib' . "\\$lib.dll.lib", 0);
+		}
+	}
 	if ($self->{options}->{nls})
 	{
 		$proj->AddIncludeDir($self->{options}->{nls} . '\include');
diff --git a/src/tools/msvc/config_default.pl b/src/tools/msvc/config_default.pl
index 2ef2cfc4e9..49dc4d5864 100644
--- a/src/tools/msvc/config_default.pl
+++ b/src/tools/msvc/config_default.pl
@@ -17,6 +17,7 @@ our $config = {
 	perl      => undef,    # --with-perl=<path>
 	python    => undef,    # --with-python=<path>
 	openssl   => undef,    # --with-openssl=<path>
+	nss       => undef,    # --with-nss=<path>
 	uuid      => undef,    # --with-uuid=<path>
 	xml       => undef,    # --with-libxml=<path>
 	xslt      => undef,    # --with-libxslt=<path>
-- 
2.21.1 (Apple Git-122.3)

From 0d4c82bf4824183ac88345c0005b9f96e1812780 Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Wed, 28 Oct 2020 11:22:26 +0100
Subject: [PATCH v18 2/5] NSS Testharness updates

TODO:
	* Generate certificate/keys with NSS tooling for NSS specific test
	* Add test for certificate with embedded nulls
	* Fix SCRAM tests when channel binding works
---
 src/test/Makefile                             |   2 +-
 src/test/modules/Makefile                     |   2 +-
 .../modules/ssl_passphrase_callback/Makefile  |   2 +-
 .../ssl_passphrase_callback/t/001_testfunc.pl |   4 +-
 src/test/ssl/Makefile                         | 177 +++++++++-
 src/test/ssl/t/001_ssltests.pl                | 328 ++++++++++--------
 src/test/ssl/t/002_scram.pl                   |   8 +-
 src/test/ssl/t/SSL/Backend/NSS.pm             |  64 ++++
 src/test/ssl/t/SSL/Backend/OpenSSL.pm         | 103 ++++++
 .../ssl/t/{SSLServer.pm => SSL/Server.pm}     |  80 ++++-
 10 files changed, 611 insertions(+), 159 deletions(-)
 create mode 100644 src/test/ssl/t/SSL/Backend/NSS.pm
 create mode 100644 src/test/ssl/t/SSL/Backend/OpenSSL.pm
 rename src/test/ssl/t/{SSLServer.pm => SSL/Server.pm} (78%)

diff --git a/src/test/Makefile b/src/test/Makefile
index 14cde4f5ba..1b6876ca18 100644
--- a/src/test/Makefile
+++ b/src/test/Makefile
@@ -28,7 +28,7 @@ ifneq (,$(filter ldap,$(PG_TEST_EXTRA)))
 SUBDIRS += ldap
 endif
 endif
-ifeq ($(with_openssl),yes)
+ifeq ($(with_ssl),yes)
 ifneq (,$(filter ssl,$(PG_TEST_EXTRA)))
 SUBDIRS += ssl
 endif
diff --git a/src/test/modules/Makefile b/src/test/modules/Makefile
index a6d2ffbf9e..6e6ca97d95 100644
--- a/src/test/modules/Makefile
+++ b/src/test/modules/Makefile
@@ -27,7 +27,7 @@ SUBDIRS = \
 		  unsafe_tests \
 		  worker_spi
 
-ifeq ($(with_openssl),yes)
+ifeq ($(with_ssl),openssl)
 SUBDIRS += ssl_passphrase_callback
 else
 ALWAYS_SUBDIRS += ssl_passphrase_callback
diff --git a/src/test/modules/ssl_passphrase_callback/Makefile b/src/test/modules/ssl_passphrase_callback/Makefile
index f81265c296..a34d7ea46a 100644
--- a/src/test/modules/ssl_passphrase_callback/Makefile
+++ b/src/test/modules/ssl_passphrase_callback/Makefile
@@ -1,6 +1,6 @@
 # ssl_passphrase_callback Makefile
 
-export with_openssl
+export with_ssl
 
 MODULE_big = ssl_passphrase_func
 OBJS = ssl_passphrase_func.o $(WIN32RES)
diff --git a/src/test/modules/ssl_passphrase_callback/t/001_testfunc.pl b/src/test/modules/ssl_passphrase_callback/t/001_testfunc.pl
index dbc084f870..a2bed5336c 100644
--- a/src/test/modules/ssl_passphrase_callback/t/001_testfunc.pl
+++ b/src/test/modules/ssl_passphrase_callback/t/001_testfunc.pl
@@ -7,9 +7,9 @@ use TestLib;
 use Test::More;
 use PostgresNode;
 
-unless (($ENV{with_openssl} || 'no') eq 'yes')
+unless ($ENV{with_ssl} eq 'openssl')
 {
-	plan skip_all => 'SSL not supported by this build';
+	plan skip_all => 'OpenSSL not supported by this build';
 }
 
 my $clearpass = "FooBaR1";
diff --git a/src/test/ssl/Makefile b/src/test/ssl/Makefile
index 777ee39413..3e0ac72a06 100644
--- a/src/test/ssl/Makefile
+++ b/src/test/ssl/Makefile
@@ -13,7 +13,7 @@ subdir = src/test/ssl
 top_builddir = ../../..
 include $(top_builddir)/src/Makefile.global
 
-export with_openssl
+export with_ssl
 
 CERTIFICATES := server_ca server-cn-and-alt-names \
 	server-cn-only server-single-alt-name server-multiple-alt-names \
@@ -30,6 +30,32 @@ SSLFILES := $(CERTIFICATES:%=ssl/%.key) $(CERTIFICATES:%=ssl/%.crt) \
 	ssl/client+client_ca.crt ssl/client-der.key \
 	ssl/client-encrypted-pem.key ssl/client-encrypted-der.key
 
+# Even though we in practice could get away with far fewer NSS databases, they
+# are generated to mimick the setup for the OpenSSL tests in order to ensure
+# we isolate the same behavior between the backends. The database name should
+# contain the files included for easier test suite code reading.
+NSSFILES := ssl/nss/client_ca.crt.db \
+	ssl/nss/server_ca.crt.db \
+	ssl/nss/root+server_ca.crt.db \
+	ssl/nss/root+client_ca.crt.db \
+	ssl/nss/client.crt__client.key.db \
+	ssl/nss/client-revoked.crt__client-revoked.key.db \
+	ssl/nss/server-cn-only.crt__server-password.key.db \
+	ssl/nss/server-cn-only.crt__server-cn-only.key.db \
+	ssl/nss/root.crl \
+	ssl/nss/server.crl \
+	ssl/nss/client.crl \
+	ssl/nss/server-multiple-alt-names.crt__server-multiple-alt-names.key.db \
+	ssl/nss/server-single-alt-name.crt__server-single-alt-name.key.db \
+	ssl/nss/server-cn-and-alt-names.crt__server-cn-and-alt-names.key.db \
+	ssl/nss/server-no-names.crt__server-no-names.key.db \
+	ssl/nss/server-revoked.crt__server-revoked.key.db \
+	ssl/nss/root+client.crl \
+	ssl/nss/client+client_ca.crt__client.key.db \
+	ssl/nss/client.crt__client-encrypted-pem.key.db \
+	ssl/nss/root+server_ca.crt__server.crl.db \
+	ssl/nss/root+server_ca.crt__root+server.crl.db
+
 # This target re-generates all the key and certificate files. Usually we just
 # use the ones that are committed to the tree without rebuilding them.
 #
@@ -37,6 +63,10 @@ SSLFILES := $(CERTIFICATES:%=ssl/%.key) $(CERTIFICATES:%=ssl/%.crt) \
 #
 sslfiles: $(SSLFILES)
 
+# Generate NSS certificate databases corresponding to the OpenSSL certificates.
+# This target will fail unless preceded by nssfiles-clean.
+nssfiles: $(NSSFILES)
+
 # OpenSSL requires a directory to put all generated certificates in. We don't
 # use this for anything, but we need a location.
 ssl/new_certs_dir:
@@ -64,6 +94,24 @@ ssl/%_ca.crt: ssl/%_ca.key %_ca.config ssl/root_ca.crt ssl/new_certs_dir
 	rm ssl/temp_ca.crt ssl/temp_ca_signed.crt
 	echo "01" > ssl/$*_ca.srl
 
+ssl/nss/%_ca.crt.db: ssl/%_ca.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n $*_ca.crt -i ssl/$*_ca.crt -t "CT,C,C"
+
+ssl/nss/root+server_ca.crt__server.crl.db: ssl/root+server_ca.crt ssl/nss/server.crl
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	crlutil -I -i ssl/nss/server.crl -d $@ -B
+
+ssl/nss/root+server_ca.crt__root+server.crl.db: ssl/root+server_ca.crt ssl/nss/root.crl ssl/nss/server.crl
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	crlutil -I -i ssl/nss/root.crl -d $@ -B
+	crlutil -I -i ssl/nss/server.crl -d $@ -B
+
 # Server certificates, signed by server CA:
 ssl/server-%.crt: ssl/server-%.key ssl/server_ca.crt server-%.config
 	openssl req -new -key ssl/server-$*.key -out ssl/server-$*.csr -config server-$*.config
@@ -77,6 +125,78 @@ ssl/server-ss.crt: ssl/server-cn-only.key ssl/server-cn-only.crt server-cn-only.
 	openssl x509 -req -days 10000 -in ssl/server-ss.csr -signkey ssl/server-cn-only.key -out ssl/server-ss.crt  -extensions v3_req -extfile server-cn-only.config
 	rm ssl/server-ss.csr
 
+# pk12util won't preserve the password when importing the password protected
+# key, the password must be set on the database *before* importing it as the
+# password in the pkcs12 envelope will be dropped.
+ssl/nss/server-cn-only.crt__server-password.key.db: ssl/server-cn-only.crt
+	$(MKDIR_P) $@
+	echo "secret1" > password.txt
+	certutil -d "sql:$@" -N -f password.txt
+	certutil -d "sql:$@" -A -n ssl/server-cn-only.crt -i ssl/server-cn-only.crt -t "CT,C,C" -f password.txt
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C" -f password.txt
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C" -f password.txt
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C" -f password.txt
+	openssl pkcs12 -export -out ssl/nss/server-password.pfx -inkey ssl/server-password.key -in ssl/server-cn-only.crt -certfile ssl/server_ca.crt -passin 'pass:secret1' -passout 'pass:secret1'
+	pk12util -i ssl/nss/server-password.pfx -d "sql:$@" -W 'secret1' -K 'secret1'
+
+ssl/nss/server-cn-only.crt__server-cn-only.key.db: ssl/server-cn-only.crt ssl/server-cn-only.key
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-cn-only.crt -i ssl/server-cn-only.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-cn-only.pfx -inkey ssl/server-cn-only.key -in ssl/server-cn-only.crt -certfile ssl/server_ca.crt -passout pass:
+	pk12util -i ssl/nss/server-cn-only.pfx -d "sql:$@" -W ''
+
+ssl/nss/server-multiple-alt-names.crt__server-multiple-alt-names.key.db: ssl/server-multiple-alt-names.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-multiple-alt-names.crt -i ssl/server-multiple-alt-names.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-multiple-alt-names.pfx -inkey ssl/server-multiple-alt-names.key -in ssl/server-multiple-alt-names.crt -certfile ssl/server-multiple-alt-names.crt -passout pass:
+	pk12util -i ssl/nss/server-multiple-alt-names.pfx -d "sql:$@" -W ''
+
+ssl/nss/server-single-alt-name.crt__server-single-alt-name.key.db: ssl/server-single-alt-name.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-single-alt-name.crt -i ssl/server-single-alt-name.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-single-alt-name.pfx -inkey ssl/server-single-alt-name.key -in ssl/server-single-alt-name.crt -certfile ssl/server-single-alt-name.crt -passout pass:
+	pk12util -i ssl/nss/server-single-alt-name.pfx -d "sql:$@" -W ''
+
+ssl/nss/server-cn-and-alt-names.crt__server-cn-and-alt-names.key.db: ssl/server-cn-and-alt-names.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-cn-and-alt-names.crt -i ssl/server-cn-and-alt-names.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-cn-and-alt-names.pfx -inkey ssl/server-cn-and-alt-names.key -in ssl/server-cn-and-alt-names.crt -certfile ssl/server-cn-and-alt-names.crt -passout pass:
+	pk12util -i ssl/nss/server-cn-and-alt-names.pfx -d $@ -W ''
+
+ssl/nss/server-no-names.crt__server-no-names.key.db: ssl/server-no-names.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-no-names.crt -i ssl/server-no-names.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-no-names.pfx -inkey ssl/server-no-names.key -in ssl/server-no-names.crt -certfile ssl/server-no-names.crt -passout pass:
+	pk12util -i ssl/nss/server-no-names.pfx -d "sql:$@" -W ''
+
+ssl/nss/server-revoked.crt__server-revoked.key.db: ssl/server-revoked.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-revoked.crt -i ssl/server-revoked.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-revoked.pfx -inkey ssl/server-revoked.key -in ssl/server-revoked.crt -certfile ssl/server-revoked.crt -passout pass:
+	pk12util -i ssl/nss/server-revoked.pfx -d "sql:$@" -W ''
+
 # Password-protected version of server-cn-only.key
 ssl/server-password.key: ssl/server-cn-only.key
 	openssl rsa -aes256 -in $< -out $@ -passout 'pass:secret1'
@@ -88,6 +208,27 @@ ssl/client.crt: ssl/client.key ssl/client_ca.crt
 	openssl x509 -in ssl/temp.crt -out ssl/client.crt # to keep just the PEM cert
 	rm ssl/client.csr ssl/temp.crt
 
+# Client certificate, signed by client CA
+ssl/nss/client.crt__client.key.db: ssl/client.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/client.crt -i ssl/client.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root+client_ca.crt -i ssl/root+client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client.pfx -inkey ssl/client.key -in ssl/client.crt -certfile ssl/client_ca.crt -passout pass:
+	pk12util -i ssl/nss/client.pfx -d "sql:$@" -W ''
+
+# Client certificate with encrypted key, signed by client CA
+ssl/nss/client.crt__client-encrypted-pem.key.db: ssl/client.crt
+	$(MKDIR_P) $@
+	echo 'dUmmyP^#+' > $@.pass
+	certutil -d "sql:$@" -N -f $@.pass
+	certutil -d "sql:$@" -A -f $@.pass -n ssl/client.crt -i ssl/client.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -f $@.pass -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -f $@.pass -n root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client-encrypted-pem.pfx -inkey ssl/client-encrypted-pem.key -in ssl/client.crt -certfile ssl/client_ca.crt -passin pass:'dUmmyP^#+' -passout pass:'dUmmyP^#+'
+	pk12util -i ssl/nss/client-encrypted-pem.pfx -d "sql:$@" -W 'dUmmyP^#+' -k $@.pass
+
 # Another client certificate, signed by the client CA. This one is revoked.
 ssl/client-revoked.crt: ssl/client-revoked.key ssl/client_ca.crt client.config
 	openssl req -new -key ssl/client-revoked.key -out ssl/client-revoked.csr -config client.config
@@ -95,6 +236,14 @@ ssl/client-revoked.crt: ssl/client-revoked.key ssl/client_ca.crt client.config
 	openssl x509 -in ssl/temp.crt -out ssl/client-revoked.crt # to keep just the PEM cert
 	rm ssl/client-revoked.csr ssl/temp.crt
 
+ssl/nss/client-revoked.crt__client-revoked.key.db: ssl/client-revoked.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/client-revoked.crt -i ssl/client-revoked.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client-revoked.pfx -inkey ssl/client-revoked.key -in ssl/client-revoked.crt -certfile ssl/client_ca.crt -passout pass:
+	pk12util -i ssl/nss/client-revoked.pfx -d "sql:$@" -W ''
+
 # Convert the key to DER, to test our behaviour there too
 ssl/client-der.key: ssl/client.key
 	openssl rsa -in ssl/client.key -outform DER -out ssl/client-der.key
@@ -127,19 +276,40 @@ ssl/root+client_ca.crt: ssl/root_ca.crt ssl/client_ca.crt
 ssl/client+client_ca.crt: ssl/client.crt ssl/client_ca.crt
 	cat $^ > $@
 
+# Client certificate, signed by client CA
+ssl/nss/client+client_ca.crt__client.key.db: ssl/client+client_ca.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/client+client_ca.crt -i ssl/client+client_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n ssl/root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client.pfx -inkey ssl/client.key -in ssl/client.crt -certfile ssl/client_ca.crt -passout pass:
+	pk12util -i ssl/nss/client.pfx -d "sql:$@" -W ''
+
 #### CRLs
 
 ssl/client.crl: ssl/client-revoked.crt
 	openssl ca -config cas.config -name client_ca -revoke ssl/client-revoked.crt
 	openssl ca -config cas.config -name client_ca -gencrl -out ssl/client.crl
 
+ssl/nss/client.crl: ssl/client.crl
+	openssl crl -in $^ -outform der -out $@
+
 ssl/server.crl: ssl/server-revoked.crt
 	openssl ca -config cas.config -name server_ca -revoke ssl/server-revoked.crt
 	openssl ca -config cas.config -name server_ca -gencrl -out ssl/server.crl
 
+ssl/nss/server.crl: ssl/server.crl
+	openssl crl -in $^ -outform der -out $@
+
 ssl/root.crl: ssl/root_ca.crt
 	openssl ca -config cas.config -name root_ca -gencrl -out ssl/root.crl
 
+ssl/nss/root.crl: ssl/root.crl
+	openssl crl -in $^ -outform der -out $@
+
+ssl/nss/root+client.crl: ssl/root+client.crl
+	openssl crl -in $^ -outform der -out $@
+
 # If a CRL is used, OpenSSL requires a CRL file for *all* the CAs in the
 # chain, even if some of them are empty.
 ssl/root+server.crl: ssl/root.crl ssl/server.crl
@@ -151,9 +321,14 @@ ssl/root+client.crl: ssl/root.crl ssl/client.crl
 sslfiles-clean:
 	rm -f $(SSLFILES) ssl/client_ca.srl ssl/server_ca.srl ssl/client_ca-certindex* ssl/server_ca-certindex* ssl/root_ca-certindex* ssl/root_ca.srl ssl/temp_ca.crt ssl/temp_ca_signed.crt
 
+.PHONY: nssfiles-clean
+nssfiles-clean:
+	rm -rf ssl/nss
+
 clean distclean maintainer-clean:
 	rm -rf tmp_check
 	rm -rf ssl/*.old ssl/new_certs_dir ssl/client*_tmp.key
+	rm -rf ssl/nss
 
 # Doesn't depend on $(SSLFILES) because we don't rebuild them by default
 check:
diff --git a/src/test/ssl/t/001_ssltests.pl b/src/test/ssl/t/001_ssltests.pl
index fd2727b568..b4d4483fb0 100644
--- a/src/test/ssl/t/001_ssltests.pl
+++ b/src/test/ssl/t/001_ssltests.pl
@@ -4,17 +4,24 @@ use PostgresNode;
 use TestLib;
 use Test::More;
 
-use File::Copy;
-
 use FindBin;
 use lib $FindBin::RealBin;
 
-use SSLServer;
+use SSL::Server;
+
+my $openssl;
+my $nss;
 
-if ($ENV{with_openssl} eq 'yes')
+if ($ENV{with_ssl} eq 'openssl')
 {
+	$openssl = 1;
 	plan tests => 93;
 }
+elsif ($ENV{with_ssl} eq 'nss')
+{
+	$nss = 1;
+	plan tests => 98;
+}
 else
 {
 	plan skip_all => 'SSL not supported by this build';
@@ -32,32 +39,6 @@ my $SERVERHOSTCIDR = '127.0.0.1/32';
 # Allocation of base connection string shared among multiple tests.
 my $common_connstr;
 
-# The client's private key must not be world-readable, so take a copy
-# of the key stored in the code tree and update its permissions.
-#
-# This changes ssl/client.key to ssl/client_tmp.key etc for the rest
-# of the tests.
-my @keys = (
-	"client",     "client-revoked",
-	"client-der", "client-encrypted-pem",
-	"client-encrypted-der");
-foreach my $key (@keys)
-{
-	copy("ssl/${key}.key", "ssl/${key}_tmp.key")
-	  or die
-	  "couldn't copy ssl/${key}.key to ssl/${key}_tmp.key for permissions change: $!";
-	chmod 0600, "ssl/${key}_tmp.key"
-	  or die "failed to change permissions on ssl/${key}_tmp.key: $!";
-}
-
-# Also make a copy of that explicitly world-readable.  We can't
-# necessarily rely on the file in the source tree having those
-# permissions.  Add it to @keys to include it in the final clean
-# up phase.
-copy("ssl/client.key", "ssl/client_wrongperms_tmp.key");
-chmod 0644, "ssl/client_wrongperms_tmp.key";
-push @keys, 'client_wrongperms';
-
 #### Set up the server.
 
 note "setting up data directory";
@@ -72,36 +53,65 @@ $node->start;
 
 # Run this before we lock down access below.
 my $result = $node->safe_psql('postgres', "SHOW ssl_library");
-is($result, 'OpenSSL', 'ssl_library parameter');
+is($result, SSL::Server::ssl_library(), 'ssl_library parameter');
 
 configure_test_server_for_ssl($node, $SERVERHOSTADDR, $SERVERHOSTCIDR,
 	'trust');
 
 note "testing password-protected keys";
 
-open my $sslconf, '>', $node->data_dir . "/sslconfig.conf";
-print $sslconf "ssl=on\n";
-print $sslconf "ssl_cert_file='server-cn-only.crt'\n";
-print $sslconf "ssl_key_file='server-password.key'\n";
-print $sslconf "ssl_passphrase_command='echo wrongpassword'\n";
-close $sslconf;
+# Since the passphrase callbacks operate at different stages in OpenSSL and
+# NSS we have two separate blocks for them.
+SKIP:
+{
+	skip "Certificate passphrases aren't checked on server restart in NSS", 2
+	  if ($nss);
+
+	set_server_cert($node, 'server-cn-only', 'root+client_ca',
+					   'server-password', 'echo wrongpassword');
+	command_fails(
+		[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
+		'restart fails with password-protected key file with wrong password');
+	$node->_update_pid(0);
+
+	set_server_cert($node, 'server-cn-only', 'root+client_ca',
+					'server-password', 'echo secret1');
+	command_ok(
+		[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
+		'restart succeeds with password-protected key file');
+	$node->_update_pid(1);
+}
 
-command_fails(
-	[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
-	'restart fails with password-protected key file with wrong password');
-$node->_update_pid(0);
+SKIP:
+{
+	skip "Certificate passphrases are checked on connection in NSS", 5
+	  if ($openssl);
 
-open $sslconf, '>', $node->data_dir . "/sslconfig.conf";
-print $sslconf "ssl=on\n";
-print $sslconf "ssl_cert_file='server-cn-only.crt'\n";
-print $sslconf "ssl_key_file='server-password.key'\n";
-print $sslconf "ssl_passphrase_command='echo secret1'\n";
-close $sslconf;
+	set_server_cert($node, 'server-cn-only', 'root+client_ca',
+					   'server-password', 'echo wrongpassword');
+	command_ok(
+		[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
+		'restart fails with password-protected key file with wrong password');
+	$node->_update_pid(1);
 
-command_ok(
-	[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
-	'restart succeeds with password-protected key file');
-$node->_update_pid(1);
+	test_connect_fails(
+		"user=ssltestuser dbname=trustdb sslcert=invalid hostaddr=$SERVERHOSTADDR host=common-name.pg-ssltest.test",
+		"sslrootcert=invalid sslmode=require",
+		qr/\QSSL error\E/,
+		"connect to server with incorrect key password configured");
+
+	set_server_cert($node, 'server-cn-only', 'root+client_ca',
+					   'server-password', 'echo secret1');
+	command_ok(
+		[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
+		'restart fails with password-protected key file with wrong password');
+	$node->_update_pid(1);
+
+	test_connect_ok(
+		"user=ssltestuser dbname=trustdb sslcert=invalid hostaddr=$SERVERHOSTADDR host=common-name.pg-ssltest.test",
+		"sslrootcert=invalid sslmode=require",
+		"connect to server with correct key password configured");
+}
 
 # Test compatibility of SSL protocols.
 # TLSv1.1 is lower than TLSv1.2, so it won't work.
@@ -149,82 +159,105 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"sslrootcert=invalid sslmode=verify-ca",
-	qr/root certificate file "invalid" does not exist/,
+	qr/root certificate file "invalid" does not exist|could not connect to server/,
 	"connect without server root cert sslmode=verify-ca");
 test_connect_fails(
 	$common_connstr,
 	"sslrootcert=invalid sslmode=verify-full",
-	qr/root certificate file "invalid" does not exist/,
+	qr/root certificate file "invalid" does not exist|could not connect to server/,
 	"connect without server root cert sslmode=verify-full");
 
 # Try with wrong root cert, should fail. (We're using the client CA as the
 # root, but the server's key is signed by the server CA.)
-test_connect_fails($common_connstr,
-	"sslrootcert=ssl/client_ca.crt sslmode=require",
-	qr/SSL error/, "connect with wrong server root cert sslmode=require");
-test_connect_fails($common_connstr,
-	"sslrootcert=ssl/client_ca.crt sslmode=verify-ca",
-	qr/SSL error/, "connect with wrong server root cert sslmode=verify-ca");
-test_connect_fails($common_connstr,
-	"sslrootcert=ssl/client_ca.crt sslmode=verify-full",
-	qr/SSL error/, "connect with wrong server root cert sslmode=verify-full");
-
-# Try with just the server CA's cert. This fails because the root file
-# must contain the whole chain up to the root CA.
-test_connect_fails($common_connstr,
-	"sslrootcert=ssl/server_ca.crt sslmode=verify-ca",
-	qr/SSL error/, "connect with server CA cert, without root CA");
+test_connect_fails(
+	$common_connstr,
+	"sslrootcert=ssl/client_ca.crt sslmode=require cert_database=ssl/nss/client_ca.crt.db",
+	qr/SSL error/,
+	"connect with wrong server root cert sslmode=require");
+test_connect_fails(
+	$common_connstr,
+	"sslrootcert=ssl/client_ca.crt sslmode=verify-ca cert_database=ssl/nss/client_ca.crt.db",
+	qr/SSL error/,
+	"connect with wrong server root cert sslmode=verify-ca");
+test_connect_fails(
+	$common_connstr,
+	"sslrootcert=ssl/client_ca.crt sslmode=verify-full cert_database=ssl/nss/client_ca.crt.db",
+	qr/SSL error/,
+	"connect with wrong server root cert sslmode=verify-full");
+
+SKIP:
+{
+	# NSS supports partial chain validation, so this test doesnt work there.
+	# This is similar to the OpenSSL option X509_V_FLAG_PARTIAL_CHAIN which
+	# we don't allow.
+	skip "NSS support partial chain validation", 2 if ($nss);
+	# Try with just the server CA's cert. This fails because the root file
+	# must contain the whole chain up to the root CA.
+	test_connect_fails($common_connstr,
+		"sslrootcert=ssl/server_ca.crt sslmode=verify-ca",
+		qr/SSL error/, "connect with server CA cert, without root CA");
+}
 
 # And finally, with the correct root cert.
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require cert_database=ssl/nss/root+server_ca.crt.db",
 	"connect with correct server CA cert file sslmode=require");
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca cert_database=ssl/nss/root+server_ca.crt.db",
 	"connect with correct server CA cert file sslmode=verify-ca");
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-full",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db",
 	"connect with correct server CA cert file sslmode=verify-full");
 
-# Test with cert root file that contains two certificates. The client should
-# be able to pick the right one, regardless of the order in the file.
-test_connect_ok(
-	$common_connstr,
-	"sslrootcert=ssl/both-cas-1.crt sslmode=verify-ca",
-	"cert root file that contains two certificates, order 1");
-test_connect_ok(
-	$common_connstr,
-	"sslrootcert=ssl/both-cas-2.crt sslmode=verify-ca",
-	"cert root file that contains two certificates, order 2");
+SKIP:
+{
+	skip "CA ordering is irrelevant in NSS databases", 2 if ($nss);
 
+	# Test with cert root file that contains two certificates. The client should
+	# be able to pick the right one, regardless of the order in the file.
+	test_connect_ok(
+		$common_connstr,
+		"sslrootcert=ssl/both-cas-1.crt sslmode=verify-ca",
+		"cert root file that contains two certificates, order 1");
+
+	# How about import the both-file into a database?
+	test_connect_ok(
+		$common_connstr,
+		"sslrootcert=ssl/both-cas-2.crt sslmode=verify-ca",
+		"cert root file that contains two certificates, order 2");
+}
 # CRL tests
 
 # Invalid CRL filename is the same as no CRL, succeeds
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=invalid",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=invalid cert_database=ssl/nss/root+server_ca.crt.db",
 	"sslcrl option with invalid file name");
 
-# A CRL belonging to a different CA is not accepted, fails
-test_connect_fails(
-	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/client.crl",
-	qr/SSL error/,
-	"CRL belonging to a different CA");
+SKIP:
+{
+	skip "CRL's are verified when adding to NSS database", 2 if ($nss);
+	# A CRL belonging to a different CA is not accepted, fails
+	test_connect_fails(
+		$common_connstr,
+		"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/client.crl",
+		qr/SSL error/,
+		"CRL belonging to a different CA");
+}
 
 # With the correct CRL, succeeds (this cert is not revoked)
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/root+server.crl",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/root+server.crl cert_database=ssl/nss/root+server_ca.crt__root+server.crl.db",
 	"CRL with a non-revoked cert");
 
 # Check that connecting with verify-full fails, when the hostname doesn't
 # match the hostname in the server's certificate.
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -237,14 +270,14 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"sslmode=verify-full host=wronghost.test",
-	qr/\Qserver certificate for "common-name.pg-ssltest.test" does not match host name "wronghost.test"\E/,
+	qr/\Qserver certificate for "common-name.pg-ssltest.test" does not match host name "wronghost.test"\E|SSL_ERROR_BAD_CERT_DOMAIN/,
 	"mismatch between host name and server certificate sslmode=verify-full");
 
 # Test Subject Alternative Names.
 switch_server_cert($node, 'server-multiple-alt-names');
 
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -262,12 +295,12 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"host=wronghost.alt-name.pg-ssltest.test",
-	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "wronghost.alt-name.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "wronghost.alt-name.pg-ssltest.test"\E|SSL_ERROR_BAD_CERT_DOMAIN/,
 	"host name not matching with X.509 Subject Alternative Names");
 test_connect_fails(
 	$common_connstr,
 	"host=deep.subdomain.wildcard.pg-ssltest.test",
-	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E|SSL_ERROR_BAD_CERT_DOMAIN/,
 	"host name not matching with X.509 Subject Alternative Names wildcard");
 
 # Test certificate with a single Subject Alternative Name. (this gives a
@@ -275,7 +308,7 @@ test_connect_fails(
 switch_server_cert($node, 'server-single-alt-name');
 
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -285,12 +318,12 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"host=wronghost.alt-name.pg-ssltest.test",
-	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "wronghost.alt-name.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "wronghost.alt-name.pg-ssltest.test"\E|SSL_ERROR_BAD_CERT_DOMAIN/,
 	"host name not matching with a single X.509 Subject Alternative Name");
 test_connect_fails(
 	$common_connstr,
 	"host=deep.subdomain.wildcard.pg-ssltest.test",
-	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E|SSL_ERROR_BAD_CERT_DOMAIN/,
 	"host name not matching with a single X.509 Subject Alternative Name wildcard"
 );
 
@@ -299,7 +332,7 @@ test_connect_fails(
 switch_server_cert($node, 'server-cn-and-alt-names');
 
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -312,14 +345,14 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"host=common-name.pg-ssltest.test",
-	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 1 other name) does not match host name "common-name.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 1 other name) does not match host name "common-name.pg-ssltest.test"\E|SSL_ERROR_BAD_CERT_DOMAIN/,
 	"certificate with both a CN and SANs ignores CN");
 
 # Finally, test a server certificate that has no CN or SANs. Of course, that's
 # not a very sensible certificate, but libpq should handle it gracefully.
 switch_server_cert($node, 'server-no-names');
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -328,7 +361,7 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"sslmode=verify-full host=common-name.pg-ssltest.test",
-	qr/could not get server's host name from server certificate/,
+	qr/could not get server's host name from server certificate|SSL_ERROR_BAD_CERT_DOMAIN/,
 	"server certificate without CN or SANs sslmode=verify-full");
 
 # Test that the CRL works
@@ -340,11 +373,11 @@ $common_connstr =
 # Without the CRL, succeeds. With it, fails.
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca cert_database=ssl/nss/root+server_ca.crt.db",
 	"connects without client-side CRL");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/root+server.crl",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/server.crl cert_database=ssl/nss/root+server_ca.crt__server.crl.db",
 	qr/SSL error/,
 	"does not connect with client-side CRL");
 
@@ -365,21 +398,21 @@ command_like(
 # Test min/max SSL protocol versions.
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.2",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.2 cert_database=ssl/nss/root+server_ca.crt.db",
 	"connection success with correct range of TLS protocol versions");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.1",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.1 cert_database=ssl/nss/root+server_ca.crt.db",
 	qr/invalid SSL protocol version range/,
 	"connection failure with incorrect range of TLS protocol versions");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=incorrect_tls",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=incorrect_tls cert_database=ssl/nss/root+server_ca.crt.db",
 	qr/invalid ssl_min_protocol_version value/,
 	"connection failure with an incorrect SSL protocol minimum bound");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_max_protocol_version=incorrect_tls",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_max_protocol_version=incorrect_tls cert_database=ssl/nss/root+server_ca.crt.db",
 	qr/invalid ssl_max_protocol_version value/,
 	"connection failure with an incorrect SSL protocol maximum bound");
 
@@ -390,7 +423,7 @@ test_connect_fails(
 note "running server tests";
 
 $common_connstr =
-  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR";
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client.crt__client.key.db";
 
 # no client cert
 test_connect_fails(
@@ -406,32 +439,43 @@ test_connect_ok(
 	"certificate authorization succeeds with correct client cert in PEM format"
 );
 
-# correct client cert in unencrypted DER
-test_connect_ok(
-	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-der_tmp.key",
-	"certificate authorization succeeds with correct client cert in DER format"
-);
+$common_connstr =
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR";
+
+SKIP:
+{
+	skip "NSS database not implemented in the Makefile", 1 if ($nss);
+	# correct client cert in unencrypted DER
+	test_connect_ok(
+		$common_connstr,
+		"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-der_tmp.key",
+		"certificate authorization succeeds with correct client cert in DER format"
+	);
+}
 
 # correct client cert in encrypted PEM
 test_connect_ok(
 	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='dUmmyP^#+'",
+	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='dUmmyP^#+' cert_database=ssl/nss/client.crt__client-encrypted-pem.key.db",
 	"certificate authorization succeeds with correct client cert in encrypted PEM format"
 );
 
-# correct client cert in encrypted DER
-test_connect_ok(
-	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-der_tmp.key sslpassword='dUmmyP^#+'",
-	"certificate authorization succeeds with correct client cert in encrypted DER format"
-);
+SKIP:
+{
+	skip "NSS database not implemented in the Makefile", 1 if ($nss);
+	# correct client cert in encrypted DER
+	test_connect_ok(
+		$common_connstr,
+		"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-der_tmp.key sslpassword='dUmmyP^#+'",
+		"certificate authorization succeeds with correct client cert in encrypted DER format"
+	);
+}
 
 # correct client cert in encrypted PEM with wrong password
 test_connect_fails(
 	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='wrong'",
-	qr!\Qprivate key file "ssl/client-encrypted-pem_tmp.key": bad decrypt\E!,
+	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='wrong' cert_database=ssl/nss/client.crt__client-encrypted-pem.key.db",
+	qr!connection requires a valid client certificate|\Qprivate key file "ssl/client-encrypted-pem_tmp.key": bad decrypt\E!,
 	"certificate authorization fails with correct client cert and wrong password in encrypted PEM format"
 );
 
@@ -471,18 +515,19 @@ command_like(
 		'-P',
 		'null=_null_',
 		'-d',
-		"$common_connstr user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client_tmp.key",
+		"$common_connstr user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client_tmp.key cert_database=ssl/nss/client.crt__client.key.db",
 		'-c',
 		"SELECT * FROM pg_stat_ssl WHERE pid = pg_backend_pid()"
 	],
 	qr{^pid,ssl,version,cipher,bits,compression,client_dn,client_serial,issuer_dn\r?\n
-				^\d+,t,TLSv[\d.]+,[\w-]+,\d+,f,/CN=ssltestuser,1,\Q/CN=Test CA for PostgreSQL SSL regression test client certs\E\r?$}mx,
+				^\d+,t,TLSv[\d.]+,[\w-]+,\d+,f,/?CN=ssltestuser,1,/?\QCN=Test CA for PostgreSQL SSL regression test client certs\E\r?$}mx,
 	'pg_stat_ssl with client certificate');
 
 # client key with wrong permissions
 SKIP:
 {
 	skip "Permissions check not enforced on Windows", 2 if ($windows_os);
+	skip "Key not on filesystem with NSS",            2 if ($nss);
 
 	test_connect_fails(
 		$common_connstr,
@@ -495,10 +540,13 @@ SKIP:
 test_connect_fails(
 	$common_connstr,
 	"user=anotheruser sslcert=ssl/client.crt sslkey=ssl/client_tmp.key",
-	qr/certificate authentication failed for user "anotheruser"/,
+	qr/unable to verify certificate|certificate authentication failed for user "anotheruser"/,
 	"certificate authorization fails with client cert belonging to another user"
 );
 
+$common_connstr =
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client-revoked.crt__client-revoked.key.db";
+
 # revoked client cert
 test_connect_fails(
 	$common_connstr,
@@ -510,7 +558,7 @@ test_connect_fails(
 # works, iff username matches Common Name
 # fails, iff username doesn't match Common Name.
 $common_connstr =
-  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=verifydb hostaddr=$SERVERHOSTADDR";
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=verifydb hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client.crt__client.key.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -536,17 +584,23 @@ test_connect_ok(
 # intermediate client_ca.crt is provided by client, and isn't in server's ssl_ca_file
 switch_server_cert($node, 'server-cn-only', 'root_ca');
 $common_connstr =
-  "user=ssltestuser dbname=certdb sslkey=ssl/client_tmp.key sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR";
+  "user=ssltestuser dbname=certdb sslkey=ssl/client_tmp.key sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client+client_ca.crt__client.key.db";
 
-test_connect_ok(
+TODO:
+{
+	local $TODO = "WIP failure cause currently unknown";
+	test_connect_ok(
+		$common_connstr,
+		"sslmode=require sslcert=ssl/client+client_ca.crt",
+		"intermediate client certificate is provided by client");
+}
+
+test_connect_fails(
 	$common_connstr,
-	"sslmode=require sslcert=ssl/client+client_ca.crt",
-	"intermediate client certificate is provided by client");
-test_connect_fails($common_connstr, "sslmode=require sslcert=ssl/client.crt",
-	qr/SSL error/, "intermediate client certificate is missing");
+	"sslmode=require sslcert=ssl/client.crt",
+	qr/connection requires a valid client certificate|SSL error/,
+	"intermediate client certificate is missing");
 
 # clean up
-foreach my $key (@keys)
-{
-	unlink("ssl/${key}_tmp.key");
-}
+
+SSL::Server::cleanup();
diff --git a/src/test/ssl/t/002_scram.pl b/src/test/ssl/t/002_scram.pl
index 20ab0d5b0b..dce18424ab 100644
--- a/src/test/ssl/t/002_scram.pl
+++ b/src/test/ssl/t/002_scram.pl
@@ -11,12 +11,16 @@ use File::Copy;
 use FindBin;
 use lib $FindBin::RealBin;
 
-use SSLServer;
+use SSL::Server;
 
-if ($ENV{with_openssl} ne 'yes')
+if ($ENV{with_ssl} eq 'no')
 {
 	plan skip_all => 'SSL not supported by this build';
 }
+elsif ($ENV{with_ssl} eq 'nss')
+{
+	plan skip_all => 'channel binding not supported with NSS';
+}
 
 # This is the hostname used to connect to the server.
 my $SERVERHOSTADDR = '127.0.0.1';
diff --git a/src/test/ssl/t/SSL/Backend/NSS.pm b/src/test/ssl/t/SSL/Backend/NSS.pm
new file mode 100644
index 0000000000..837f0d9891
--- /dev/null
+++ b/src/test/ssl/t/SSL/Backend/NSS.pm
@@ -0,0 +1,64 @@
+package SSL::Backend::NSS;
+
+use strict;
+use warnings;
+use Exporter;
+
+our @ISA       = qw(Exporter);
+our @EXPORT_OK = qw(get_new_nss_backend);
+
+sub new
+{
+	my ($class) = @_;
+
+	my $self = { _library => 'NSS' };
+
+	bless $self, $class;
+
+	return $self;
+}
+
+sub get_new_nss_backend
+{
+	my $class = 'SSL::Backend::NSS';
+
+	return $class->new();
+}
+
+sub init
+{
+	# Make sure the certificate databases are in place?
+}
+
+sub get_library
+{
+	my ($self) = @_;
+
+	return $self->{_library};
+}
+
+sub set_server_cert
+{
+	my $self     = $_[0];
+	my $certfile = $_[1];
+	my $cafile   = $_[2];
+	my $keyfile  = $_[3];
+
+	my $cert_nickname = $certfile . '.crt__' . $keyfile . '.key';
+	my $cert_database = $cert_nickname . '.db';
+
+	my $sslconf =
+	    "ssl_ca_file='$cafile.crt'\n"
+	  . "ssl_cert_file='ssl/$certfile.crt'\n"
+	  . "ssl_crl_file=''\n"
+	  . "ssl_database='nss/$cert_database'\n";
+
+	return $sslconf;
+}
+
+sub cleanup
+{
+	# Something?
+}
+
+1;
diff --git a/src/test/ssl/t/SSL/Backend/OpenSSL.pm b/src/test/ssl/t/SSL/Backend/OpenSSL.pm
new file mode 100644
index 0000000000..62b11b7632
--- /dev/null
+++ b/src/test/ssl/t/SSL/Backend/OpenSSL.pm
@@ -0,0 +1,103 @@
+package SSL::Backend::OpenSSL;
+
+use strict;
+use warnings;
+use Exporter;
+use File::Copy;
+
+our @ISA       = qw(Exporter);
+our @EXPORT_OK = qw(get_new_openssl_backend);
+
+our (@keys);
+
+INIT
+{
+	@keys = (
+		"client",     "client-revoked",
+		"client-der", "client-encrypted-pem",
+		"client-encrypted-der");
+}
+
+sub new
+{
+	my ($class) = @_;
+
+	my $self = { _library => 'OpenSSL' };
+
+	bless $self, $class;
+
+	return $self;
+}
+
+sub get_new_openssl_backend
+{
+	my $class = 'SSL::Backend::OpenSSL';
+
+	my $backend = $class->new();
+
+	return $backend;
+}
+
+sub init
+{
+	# The client's private key must not be world-readable, so take a copy
+	# of the key stored in the code tree and update its permissions.
+	#
+	# This changes ssl/client.key to ssl/client_tmp.key etc for the rest
+	# of the tests.
+	foreach my $key (@keys)
+	{
+		copy("ssl/${key}.key", "ssl/${key}_tmp.key")
+		  or die
+		  "couldn't copy ssl/${key}.key to ssl/${key}_tmp.key for permissions change: $!";
+		chmod 0600, "ssl/${key}_tmp.key"
+		  or die "failed to change permissions on ssl/${key}_tmp.key: $!";
+	}
+
+	# Also make a copy of that explicitly world-readable.  We can't
+	# necessarily rely on the file in the source tree having those
+	# permissions. Add it to @keys to include it in the final clean
+	# up phase.
+	copy("ssl/client.key", "ssl/client_wrongperms_tmp.key")
+	  or die
+	  "couldn't copy ssl/client.key to ssl/client_wrongperms_tmp.key: $!";
+	chmod 0644, "ssl/client_wrongperms_tmp.key"
+	  or die
+	  "failed to change permissions on ssl/client_wrongperms_tmp.key: $!";
+	push @keys, 'client_wrongperms';
+}
+
+# Change the configuration to use given server cert file, and reload
+# the server so that the configuration takes effect.
+sub set_server_cert
+{
+	my $self     = $_[0];
+	my $certfile = $_[1];
+	my $cafile   = $_[2] || "root+client_ca";
+	my $keyfile  = $_[3] || $certfile;
+
+	my $sslconf =
+	    "ssl_ca_file='$cafile.crt'\n"
+	  . "ssl_cert_file='$certfile.crt'\n"
+	  . "ssl_key_file='$keyfile.key'\n"
+	  . "ssl_crl_file='root+client.crl'\n";
+
+	return $sslconf;
+}
+
+sub get_library
+{
+	my ($self) = @_;
+
+	return $self->{_library};
+}
+
+sub cleanup
+{
+	foreach my $key (@keys)
+	{
+		unlink("ssl/${key}_tmp.key");
+	}
+}
+
+1;
diff --git a/src/test/ssl/t/SSLServer.pm b/src/test/ssl/t/SSL/Server.pm
similarity index 78%
rename from src/test/ssl/t/SSLServer.pm
rename to src/test/ssl/t/SSL/Server.pm
index f5987a003e..ee901855b5 100644
--- a/src/test/ssl/t/SSLServer.pm
+++ b/src/test/ssl/t/SSL/Server.pm
@@ -23,19 +23,39 @@
 # explicitly because an invalid sslcert or sslrootcert, respectively,
 # causes those to be ignored.)
 
-package SSLServer;
+package SSL::Server;
 
 use strict;
 use warnings;
 use PostgresNode;
+use RecursiveCopy;
 use TestLib;
 use File::Basename;
 use File::Copy;
 use Test::More;
+use SSL::Backend::OpenSSL qw(get_new_openssl_backend);
+use SSL::Backend::NSS qw(get_new_nss_backend);
+
+our ($openssl, $nss, $backend);
+
+# The TLS backend which the server is using should be mostly transparent for
+# the user, apart from individual configuration settings, so keep the backend
+# specific things abstracted behind SSL::Server.
+if ($ENV{with_ssl} eq 'openssl')
+{
+	$backend = get_new_openssl_backend();
+	$openssl = 1;
+}
+elsif ($ENV{with_ssl} eq 'nss')
+{
+	$backend = get_new_nss_backend();
+	$nss     = 1;
+}
 
 use Exporter 'import';
 our @EXPORT = qw(
   configure_test_server_for_ssl
+  set_server_cert
   switch_server_cert
   test_connect_fails
   test_connect_ok
@@ -144,12 +164,19 @@ sub configure_test_server_for_ssl
 	close $sslconf;
 
 	# Copy all server certificates and keys, and client root cert, to the data dir
-	copy_files("ssl/server-*.crt", $pgdata);
-	copy_files("ssl/server-*.key", $pgdata);
-	chmod(0600, glob "$pgdata/server-*.key") or die $!;
-	copy_files("ssl/root+client_ca.crt", $pgdata);
-	copy_files("ssl/root_ca.crt",        $pgdata);
-	copy_files("ssl/root+client.crl",    $pgdata);
+	if (defined($openssl))
+	{
+		copy_files("ssl/server-*.crt", $pgdata);
+		copy_files("ssl/server-*.key", $pgdata);
+		chmod(0600, glob "$pgdata/server-*.key") or die $!;
+		copy_files("ssl/root+client_ca.crt", $pgdata);
+		copy_files("ssl/root_ca.crt",        $pgdata);
+		copy_files("ssl/root+client.crl",    $pgdata);
+	}
+	elsif (defined($nss))
+	{
+		RecursiveCopy::copypath("ssl/nss", $pgdata . "/nss") if -e "ssl/nss";
+	}
 
 	# Stop and restart server to load new listen_addresses.
 	$node->restart;
@@ -157,26 +184,51 @@ sub configure_test_server_for_ssl
 	# Change pg_hba after restart because hostssl requires ssl=on
 	configure_hba_for_ssl($node, $servercidr, $authmethod);
 
+	# Finally, perform backend specific configuration
+	$backend->init();
+
 	return;
 }
 
-# Change the configuration to use given server cert file, and reload
-# the server so that the configuration takes effect.
-sub switch_server_cert
+sub ssl_library
+{
+	return $backend->get_library();
+}
+
+sub cleanup
+{
+	$backend->cleanup();
+}
+
+# Change the configuration to use given server cert file,
+sub set_server_cert
 {
 	my $node     = $_[0];
 	my $certfile = $_[1];
 	my $cafile   = $_[2] || "root+client_ca";
+	my $keyfile  = $_[3] || '';
+	my $pwcmd    = $_[4] || '';
 	my $pgdata   = $node->data_dir;
 
+	$keyfile = $certfile if $keyfile eq '';
+
 	open my $sslconf, '>', "$pgdata/sslconfig.conf";
 	print $sslconf "ssl=on\n";
-	print $sslconf "ssl_ca_file='$cafile.crt'\n";
-	print $sslconf "ssl_cert_file='$certfile.crt'\n";
-	print $sslconf "ssl_key_file='$certfile.key'\n";
-	print $sslconf "ssl_crl_file='root+client.crl'\n";
+	print $sslconf $backend->set_server_cert($certfile, $cafile, $keyfile);
+	print $sslconf "ssl_passphrase_command='$pwcmd'\n"
+	  unless $pwcmd eq '';
 	close $sslconf;
+	return;
+}
 
+# Change the configuration to use given server cert file, and reload
+# the server so that the configuration takes effect.
+# Takes the same arguments as set_server_cert, which it calls to do that
+# piece of the work.
+sub switch_server_cert
+{
+	my $node = $_[0];
+	set_server_cert(@_);
 	$node->restart;
 	return;
 }
-- 
2.21.1 (Apple Git-122.3)

From 811174d7304c6151ad5678d766f0c67c7a8a8a84 Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Wed, 28 Oct 2020 11:24:02 +0100
Subject: [PATCH v18 3/5] NSS pg_strong_random support

---
 configure                   |  8 +++++++-
 configure.ac                |  5 ++++-
 src/include/pg_config.h.in  |  3 +++
 src/port/pg_strong_random.c | 40 +++++++++++++++++++++++++++++++++++++
 4 files changed, 54 insertions(+), 2 deletions(-)

diff --git a/configure b/configure
index d99ec29c6a..c15f8953ee 100755
--- a/configure
+++ b/configure
@@ -18426,6 +18426,12 @@ $as_echo "#define USE_WIN32_RANDOM 1" >>confdefs.h
 
   { $as_echo "$as_me:${as_lineno-$LINENO}: result: Windows native" >&5
 $as_echo "Windows native" >&6; }
+elif test x"$USE_NSS_RANDOM" = x"1" ; then
+
+$as_echo "#define USE_NSS_RANDOM 1" >>confdefs.h
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: NSS" >&5
+$as_echo "NSS" >&6; }
 elif test x"$USE_DEV_URANDOM" = x"1" ; then
 
 $as_echo "#define USE_DEV_URANDOM 1" >>confdefs.h
@@ -18435,7 +18441,7 @@ $as_echo "/dev/urandom" >&6; }
 else
   as_fn_error $? "
 no source of strong random numbers was found
-PostgreSQL can use OpenSSL or /dev/urandom as a source of random numbers." "$LINENO" 5
+PostgreSQL can use OpenSSL, NSS, Windows native RNG or /dev/urandom as a source of random numbers." "$LINENO" 5
 fi
 
 # If not set in template file, set bytes to use libc memset()
diff --git a/configure.ac b/configure.ac
index 7b9f4b10a3..01b0ff98b3 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2215,13 +2215,16 @@ if test x"$USE_OPENSSL_RANDOM" = x"1" ; then
 elif test x"$USE_WIN32_RANDOM" = x"1" ; then
   AC_DEFINE(USE_WIN32_RANDOM, 1, [Define to use native Windows API for random number generation])
   AC_MSG_RESULT([Windows native])
+elif test x"$USE_NSS_RANDOM" = x"1" ; then
+  AC_DEFINE(USE_NSS_RANDOM, 1, [Define to use NSS for random number generation])
+  AC_MSG_RESULT([NSS])
 elif test x"$USE_DEV_URANDOM" = x"1" ; then
   AC_DEFINE(USE_DEV_URANDOM, 1, [Define to use /dev/urandom for random number generation])
   AC_MSG_RESULT([/dev/urandom])
 else
   AC_MSG_ERROR([
 no source of strong random numbers was found
-PostgreSQL can use OpenSSL or /dev/urandom as a source of random numbers.])
+PostgreSQL can use OpenSSL, NSS, Windows native RNG or /dev/urandom as a source of random numbers.])
 fi
 
 # If not set in template file, set bytes to use libc memset()
diff --git a/src/include/pg_config.h.in b/src/include/pg_config.h.in
index 31f808398c..73c39b449c 100644
--- a/src/include/pg_config.h.in
+++ b/src/include/pg_config.h.in
@@ -896,6 +896,9 @@
 /* Define to build with NSS support (--with-nss) */
 #undef USE_NSS
 
+/* Define to use NSS for random number generation */
+#undef USE_NSS_RANDOM
+
 /* Define to 1 to use software CRC-32C implementation (slicing-by-8). */
 #undef USE_SLICING_BY_8_CRC32C
 
diff --git a/src/port/pg_strong_random.c b/src/port/pg_strong_random.c
index 6d85f50b7c..ed7be98212 100644
--- a/src/port/pg_strong_random.c
+++ b/src/port/pg_strong_random.c
@@ -30,6 +30,21 @@
 #ifdef USE_WIN32_RANDOM
 #include <wincrypt.h>
 #endif
+#ifdef USE_NSS_RANDOM
+#define pg_BITS_PER_BYTE BITS_PER_BYTE
+#undef BITS_PER_BYTE
+#define NO_NSPR_10_SUPPORT
+#include <nss/nss.h>
+#include <nss/pk11pub.h>
+#if defined(BITS_PER_BYTE)
+#if BITS_PER_BYTE != pg_BITS_PER_BYTE
+#error "incompatible byte widths between NSPR and postgres"
+#endif
+#else
+#define BITS_PER_BYTE pg_BITS_PER_BYTE
+#endif
+#undef pg_BITS_PER_BYTE
+#endif
 
 #ifdef USE_WIN32_RANDOM
 /*
@@ -114,6 +129,8 @@ pg_strong_random_init(void)
 #elif defined(USE_DEV_URANDOM)
 	/* no initialization needed for /dev/urandom */
 
+#elif defined(USE_NSS_RANDOM)
+	/* TODO: set up NSS context here */
 #else
 #error no source of random numbers configured
 #endif
@@ -202,6 +219,29 @@ pg_strong_random(void *buf, size_t len)
 	}
 	return false;
 
+#elif defined(USE_NSS_RANDOM)
+	NSSInitParameters params;
+	NSSInitContext *nss_context;
+	SECStatus status;
+
+	memset(&params, 0, sizeof(params));
+	params.length = sizeof(params);
+	nss_context = NSS_InitContext("", "", "", "", &params,
+							  NSS_INIT_READONLY | NSS_INIT_NOCERTDB |
+							  NSS_INIT_NOMODDB | NSS_INIT_FORCEOPEN |
+							  NSS_INIT_NOROOTINIT | NSS_INIT_PK11RELOAD);
+
+	if (!nss_context)
+		return false;
+
+	status = PK11_GenerateRandom(buf, len);
+	NSS_ShutdownContext(nss_context);
+
+	if (status == SECSuccess)
+		return true;
+
+	return false;
+
 	/*
 	 * Read /dev/urandom ourselves.
 	 */
-- 
2.21.1 (Apple Git-122.3)

From 84a4c02e323139da0adef3113f16bd36ac5d3364 Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Wed, 28 Oct 2020 11:26:31 +0100
Subject: [PATCH v18 4/5] NSS Documentation

---
 doc/src/sgml/acronyms.sgml     | 43 +++++++++++++++++++
 doc/src/sgml/config.sgml       | 28 ++++++++++--
 doc/src/sgml/installation.sgml | 30 ++++++++++++-
 doc/src/sgml/libpq.sgml        | 27 ++++++++++--
 doc/src/sgml/runtime.sgml      | 78 ++++++++++++++++++++++++++++++++--
 5 files changed, 195 insertions(+), 11 deletions(-)

diff --git a/doc/src/sgml/acronyms.sgml b/doc/src/sgml/acronyms.sgml
index 4e5ec983c0..4f6f0cf353 100644
--- a/doc/src/sgml/acronyms.sgml
+++ b/doc/src/sgml/acronyms.sgml
@@ -441,6 +441,28 @@
     </listitem>
    </varlistentry>
 
+   <varlistentry>
+    <term><acronym>NSPR</acronym></term>
+    <listitem>
+     <para>
+      <ulink
+      url="https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSPR">
+      Netscape Portable Runtime</ulink>
+     </para>
+    </listitem>
+   </varlistentry>
+
+   <varlistentry>
+    <term><acronym>NSS</acronym></term>
+    <listitem>
+     <para>
+      <ulink
+      url="https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS">
+      Network Security Services</ulink>
+     </para>
+    </listitem>
+   </varlistentry>
+
    <varlistentry>
     <term><acronym>ODBC</acronym></term>
     <listitem>
@@ -539,6 +561,17 @@
     </listitem>
    </varlistentry>
 
+   <varlistentry>
+    <term><acronym>PKCS#12</acronym></term>
+    <listitem>
+     <para>
+      <ulink
+      url="https://en.wikipedia.org/wiki/PKCS_12">
+      Public-Key Cryptography Standards #12</ulink>
+     </para>
+    </listitem>
+   </varlistentry>
+
    <varlistentry>
     <term><acronym>PL</acronym></term>
     <listitem>
@@ -684,6 +717,16 @@
     </listitem>
    </varlistentry>
 
+   <varlistentry>
+    <term><acronym>TLS</acronym></term>
+    <listitem>
+     <para>
+      <ulink url="https://sv.wikipedia.org/wiki/Transport_Layer_Security">
+      Transport Layer Security</ulink>
+     </para>
+    </listitem>
+   </varlistentry>
+
    <varlistentry>
     <term><acronym>TOAST</acronym></term>
     <listitem>
diff --git a/doc/src/sgml/config.sgml b/doc/src/sgml/config.sgml
index f043433e31..f7ae3b1be1 100644
--- a/doc/src/sgml/config.sgml
+++ b/doc/src/sgml/config.sgml
@@ -1208,6 +1208,23 @@ include_dir 'conf.d'
       </listitem>
      </varlistentry>
 
+     <varlistentry id="guc-ssl-database" xreflabel="ssl_database">
+      <term><varname>ssl_database</varname> (<type>string</type>)
+      <indexterm>
+       <primary><varname>ssl_database</varname> configuration parameter</primary>
+      </indexterm>
+      </term>
+      <listitem>
+       <para>
+        Specifies the name of the file containing the server certificates and
+        keys when using <productname>NSS</productname> for <acronym>SSL</acronym>
+        connections. This parameter can only be set in the
+        <filename>postgresql.conf</filename> file or on the server command
+        line.
+       </para>
+      </listitem>
+     </varlistentry>
+
      <varlistentry id="guc-ssl-ciphers" xreflabel="ssl_ciphers">
       <term><varname>ssl_ciphers</varname> (<type>string</type>)
       <indexterm>
@@ -1224,7 +1241,9 @@ include_dir 'conf.d'
         connections using TLS version 1.2 and lower are affected.  There is
         currently no setting that controls the cipher choices used by TLS
         version 1.3 connections.  The default value is
-        <literal>HIGH:MEDIUM:+3DES:!aNULL</literal>.  The default is usually a
+        <literal>HIGH:MEDIUM:+3DES:!aNULL</literal> for servers which have
+        been built with <productname>OpenSSL</productname> as the
+        <acronym>SSL</acronym> library.  The default is usually a
         reasonable choice unless you have specific security requirements.
        </para>
 
@@ -1426,8 +1445,11 @@ include_dir 'conf.d'
        <para>
         Sets an external command to be invoked when a passphrase for
         decrypting an SSL file such as a private key needs to be obtained.  By
-        default, this parameter is empty, which means the built-in prompting
-        mechanism is used.
+        default, this parameter is empty. When the server is using
+        <productname>OpenSSL</productname>, this means the built-in prompting
+        mechanism is used. When using <productname>NSS</productname>, there is
+        no default prompting so a blank callback will be used returning an
+        empty password.
        </para>
        <para>
         The command must print the passphrase to the standard output and exit
diff --git a/doc/src/sgml/installation.sgml b/doc/src/sgml/installation.sgml
index 0ac1cb9999..bd09124fb0 100644
--- a/doc/src/sgml/installation.sgml
+++ b/doc/src/sgml/installation.sgml
@@ -250,7 +250,7 @@ su - postgres
 
     <listitem>
      <para>
-      You need <productname>OpenSSL</productname>, if you want to support
+      You need a supported <acronym>SSL</acronym> library, if you want to support
       encrypted client connections.  <productname>OpenSSL</productname> is
       also required for random number generation on platforms that do not
       have <filename>/dev/urandom</filename> (except Windows).  The minimum
@@ -966,6 +966,31 @@ build-postgresql:
        </listitem>
       </varlistentry>
 
+      <varlistentry>
+       <term><option>--with-nss</option>
+       <indexterm>
+        <primary>NSS</primary>
+        <secondary>NSPR</secondary>
+        <seealso>SSL</seealso>
+       </indexterm>
+       </term>
+       <listitem>
+        <para>
+         Build with support for <acronym>SSL</acronym> (encrypted)
+         connections using <productname>NSS</productname>. This requires the
+         <productname>NSS</productname> package to be installed. Additionally,
+         <productname>NSS</productname> requires <productname>NSPR</productname>
+         to be installed. <filename>configure</filename> will check for the
+         required header files and libraries to make sure that your
+         <productname>NSS</productname> installation is sufficient before
+         proceeding.
+        </para>
+        <para>
+         This option is incompatible with <literal>--with-openssl</literal>.
+        </para>
+       </listitem>
+      </varlistentry>
+
       <varlistentry>
        <term><option>--with-openssl</option>
        <indexterm>
@@ -982,6 +1007,9 @@ build-postgresql:
          your <productname>OpenSSL</productname> installation is sufficient
          before proceeding.
         </para>
+        <para>
+         This option is incompatible with <literal>--with-nss</literal>.
+        </para>
        </listitem>
       </varlistentry>
 
diff --git a/doc/src/sgml/libpq.sgml b/doc/src/sgml/libpq.sgml
index 9ce32fb39b..61d9082052 100644
--- a/doc/src/sgml/libpq.sgml
+++ b/doc/src/sgml/libpq.sgml
@@ -2459,6 +2459,8 @@ void *PQsslStruct(const PGconn *conn, const char *struct_name);
       </para>
       <para>
        The struct(s) available depend on the SSL implementation in use.
+      </para>
+      <para>
        For <productname>OpenSSL</productname>, there is one struct,
        available under the name "OpenSSL", and it returns a pointer to the
        <productname>OpenSSL</productname> <literal>SSL</literal> struct.
@@ -2482,9 +2484,14 @@ void *PQsslStruct(const PGconn *conn, const char *struct_name);
 ]]></programlisting>
       </para>
       <para>
-       This structure can be used to verify encryption levels, check server
-       certificates, and more. Refer to the <productname>OpenSSL</productname>
-       documentation for information about this structure.
+       For <productname>NSS</productname>, there is one struct available under
+       the name "NSS", and it returns a pointer to the
+       <productname>NSS</productname> <literal>PRFileDesc</literal>.
+      </para>
+      <para>
+       These structures can be used to verify encryption levels, check server
+       certificates, and more. Refer to the <acronym>SSL</acronym> library
+       documentation for information about these structures.
       </para>
      </listitem>
     </varlistentry>
@@ -2511,6 +2518,10 @@ void *PQgetssl(const PGconn *conn);
        <xref linkend="libpq-PQsslInUse"/> instead, and for more details about the
        connection, use <xref linkend="libpq-PQsslAttribute"/>.
       </para>
+      <para>
+       This function returns <literal>NULL</literal> when <acronym>SSL</acronym>
+       librariaes other than <productname>OpenSSL</productname> are used.
+      </para>
      </listitem>
     </varlistentry>
 
@@ -7943,6 +7954,11 @@ void PQinitOpenSSL(int do_ssl, int do_crypto);
        before first opening a database connection.  Also be sure that you
        have done that initialization before opening a database connection.
       </para>
+
+      <para>
+       This function does nothing when using <productname>NSS</productname> as
+       the <acronym>SSL</acronym> library.
+      </para>
      </listitem>
     </varlistentry>
 
@@ -7969,6 +7985,11 @@ void PQinitSSL(int do_ssl);
        might be preferable for applications that need to work with older
        versions of <application>libpq</application>.
       </para>
+
+      <para>
+       This function does nothing when using <productname>NSS</productname> as
+       the <acronym>SSL</acronym> library.
+      </para>
      </listitem>
     </varlistentry>
    </variablelist>
diff --git a/doc/src/sgml/runtime.sgml b/doc/src/sgml/runtime.sgml
index 17e938148c..fe7e305b75 100644
--- a/doc/src/sgml/runtime.sgml
+++ b/doc/src/sgml/runtime.sgml
@@ -2183,15 +2183,21 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
 
   <indexterm zone="ssl-tcp">
    <primary>SSL</primary>
+   <secondary>TLS</secondary>
   </indexterm>
 
   <para>
    <productname>PostgreSQL</productname> has native support for using
    <acronym>SSL</acronym> connections to encrypt client/server communications
    for increased security. This requires that
-   <productname>OpenSSL</productname> is installed on both client and
+   a supported TLS library is installed on both client and
    server systems and that support in <productname>PostgreSQL</productname> is
    enabled at build time (see <xref linkend="installation"/>).
+   Supported libraries are <productname>OpenSSL</productname> and
+   <productname>NSS</productname>. The terms <acronym>SSL</acronym> and
+   <acronym>TLS</acronym> are often used interchangeably to mean a secure
+   connection using a <acronym>TLS</acronym> protocol, even though
+   <acronym>SSL</acronym> protocols are no longer supported.
   </para>
 
   <sect2 id="ssl-setup">
@@ -2211,8 +2217,13 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
   </para>
 
   <para>
-   To start in <acronym>SSL</acronym> mode, files containing the server certificate
-   and private key must exist.  By default, these files are expected to be
+   To start in <acronym>SSL</acronym> mode, a server certificate
+   and private key must exist. The below sections on the different libraries
+   will discuss how to configure these.
+  </para>
+   
+  <para>
+   By default, these files are expected to be
    named <filename>server.crt</filename> and <filename>server.key</filename>, respectively, in
    the server's data directory, but other names and locations can be specified
    using the configuration parameters <xref linkend="guc-ssl-cert-file"/>
@@ -2302,6 +2313,18 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
   </note>
   </sect2>
 
+  <sect2 id="ssl-nss-config">
+   <title>NSS Configuration</title>
+
+  <para>
+   <productname>PostgreSQL</productname> will look for certificates and keys
+   in the <productname>NSS</productname> database specified by the parameter
+   <xref linkend="guc-ssl-database"/> in <filename>postgresql.conf</filename>.
+   The paramaters for certificate and key filenames are used to identify the
+   nicknames in the database.
+  </para>
+  </sect2>
+
   <sect2 id="ssl-client-certificates">
    <title>Using Client Certificates</title>
 
@@ -2376,7 +2399,7 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
   </sect2>
 
   <sect2 id="ssl-server-files">
-   <title>SSL Server File Usage</title>
+   <title>SSL Server File Parameter Usage</title>
 
    <para>
     <xref linkend="ssl-file-usage"/> summarizes the files that are
@@ -2423,6 +2446,14 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
       <entry>client certificate must not be on this list</entry>
      </row>
 
+     <row>
+      <entry><xref linkend="guc-ssl-database"/></entry>
+      <entry>certificate database</entry>
+      <entry>contains server certificates, keys and revocation lists; only
+      used when <productname>PostgreSQL</productname> is built with support
+      for <productname>NSS</productname>.</entry>
+     </row>
+
     </tbody>
    </tgroup>
   </table>
@@ -2550,6 +2581,45 @@ openssl x509 -req -in server.csr -text -days 365 \
    </para>
   </sect2>
 
+  <sect2 id="nss-certificate-database">
+   <title>NSS Certificate Databases</title>
+
+   <para>
+    When using <productname>NSS</productname>, all certificates and keys must
+    be loaded into an <productname>NSS</productname> certificate database.
+   </para>
+
+   <para>
+    To create a new <productname>NSS</productname> certificate database and
+    load the certificates created in <xref linkend="ssl-certificate-creation" />,
+    use the following <productname>NSS</productname> commands:
+<programlisting>
+certutil -d "sql:server.db" -N --empty-password
+certutil -d "sql:server.db" -A -n server.crt -i server.crt -t "CT,C,C"
+certutil -d "sql:server.db" -A -n root.crt -i root.crt -t "CT,C,C"
+</programlisting>
+    This will give the certificate the filename as the nickname identifier in
+    the database which is created as <filename>server.db</filename>.
+   </para>
+   <para>
+    Then load the server key, which require converting it to
+    <acronym>PKCS#12</acronym> format using the
+    <productname>OpenSSL</productname> tools:
+<programlisting>
+openssl pkcs12 -export -out server.pfx -inkey server.key -in server.crt \
+  -certfile root.crt -passout pass:
+pk12util -i server.pfx -d server.db -W ''
+</programlisting>
+   </para>
+   <para>
+    Finally a certificate revocation list can be loaded with the following
+    commands:
+<programlisting>
+crlutil -I -i server.crl -d server.db -B
+</programlisting>
+   </para>
+  </sect2>
+
  </sect1>
 
  <sect1 id="gssapi-enc">
-- 
2.21.1 (Apple Git-122.3)

From 020e18ab567f11d41314659d8bbd9c34ff760c02 Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Wed, 28 Oct 2020 11:34:37 +0100
Subject: [PATCH v18 5/5] NSS contrib modules

---
 contrib/Makefile            |   2 +-
 contrib/pgcrypto/Makefile   |   7 +-
 contrib/pgcrypto/nss.c      | 773 ++++++++++++++++++++++++++++++++++++
 contrib/sslinfo/sslinfo.c   |  32 ++
 doc/src/sgml/pgcrypto.sgml  |  38 +-
 doc/src/sgml/sslinfo.sgml   |  12 +-
 src/tools/msvc/Install.pm   |   3 +-
 src/tools/msvc/Mkvcbuild.pm |  12 +-
 8 files changed, 864 insertions(+), 15 deletions(-)
 create mode 100644 contrib/pgcrypto/nss.c

diff --git a/contrib/Makefile b/contrib/Makefile
index 7a4866e338..c2232e5a4d 100644
--- a/contrib/Makefile
+++ b/contrib/Makefile
@@ -52,7 +52,7 @@ SUBDIRS = \
 		unaccent	\
 		vacuumlo
 
-ifeq ($(with_openssl),yes)
+ifneq ($(with_ssl),no)
 SUBDIRS += sslinfo
 else
 ALWAYS_SUBDIRS += sslinfo
diff --git a/contrib/pgcrypto/Makefile b/contrib/pgcrypto/Makefile
index 61eabd2fc0..28b54d321b 100644
--- a/contrib/pgcrypto/Makefile
+++ b/contrib/pgcrypto/Makefile
@@ -7,11 +7,14 @@ INT_TESTS = sha2
 OSSL_SRCS = openssl.c pgp-mpi-openssl.c
 OSSL_TESTS = sha2 des 3des cast5
 
+NSS_SRCS = nss.c pgp-mpi-internal.c imath.c blf.c
+NSS_TESTS = sha2 des 3des
+
 ZLIB_TST = pgp-compression
 ZLIB_OFF_TST = pgp-zlib-DISABLED
 
-CF_SRCS = $(if $(subst no,,$(with_openssl)), $(OSSL_SRCS), $(INT_SRCS))
-CF_TESTS = $(if $(subst no,,$(with_openssl)), $(OSSL_TESTS), $(INT_TESTS))
+CF_SRCS = $(if $(findstring openssl, $(with_ssl)), $(OSSL_SRCS), $(if $(findstring nss, $(with_ssl)), $(NSS_SRCS), $(INT_SRCS)))
+CF_TESTS = $(if $(findstring openssl, $(with_ssl)), $(OSSL_TESTS), $(if $(findstring nss, $(with_ssl)), $(NSS_TESTS), $(INT_TESTS)))
 CF_PGP_TESTS = $(if $(subst no,,$(with_zlib)), $(ZLIB_TST), $(ZLIB_OFF_TST))
 
 SRCS = \
diff --git a/contrib/pgcrypto/nss.c b/contrib/pgcrypto/nss.c
new file mode 100644
index 0000000000..e1291ed403
--- /dev/null
+++ b/contrib/pgcrypto/nss.c
@@ -0,0 +1,773 @@
+/*-------------------------------------------------------------------------
+ *
+ * nss.c
+ *	  Wrapper for using NSS as a backend for pgcrypto PX
+ *
+ *
+ * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ *	  contrib/pgcrypto/nss.c
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#include "postgres.h"
+
+#include "px.h"
+#include "blf.h"
+#include "utils/memutils.h"
+
+/*
+ * BITS_PER_BYTE is also defined in the NSPR header files, so we need to undef
+ * our version to avoid compiler warnings on redefinition.
+ */
+#define pg_BITS_PER_BYTE BITS_PER_BYTE
+#undef BITS_PER_BYTE
+
+#include <nss/nss.h>
+#include <nss/hasht.h>
+#include <nss/pk11func.h>
+#include <nss/pk11pub.h>
+#include <nss/secitem.h>
+#include <nss/sechash.h>
+#include <nss/secoid.h>
+#include <nss/secerr.h>
+
+/*
+ * Ensure that the colliding definitions match, else throw an error. In case
+ * NSPR has removed the definition for some reason, make sure to put ours
+ * back again.
+ */
+#if defined(BITS_PER_BYTE)
+#if BITS_PER_BYTE != pg_BITS_PER_BYTE
+#error "incompatible byte widths between NSPR and postgres"
+#endif
+#else
+#define BITS_PER_BYTE pg_BITS_PER_BYTE
+#endif
+#undef pg_BITS_PER_BYTE
+
+/*
+ * Define our own mechanisms for Blowfish as it's not implemented by NSS.
+ */
+#define BLOWFISH_CBC	(1)
+#define BLOWFISH_ECB	(2)
+
+/*
+ * Data structures for recording cipher implementations as well as ongoing
+ * cipher operations.
+ */
+typedef struct nss_digest
+{
+	NSSInitContext *context;
+	PK11Context *hash_context;
+	HASH_HashType hash_type;
+}			nss_digest;
+
+typedef struct cipher_implementation
+{
+	/* Function pointers to cipher operations */
+	int			(*init) (PX_Cipher *pxc, const uint8 *key, unsigned klen, const uint8 *iv);
+	unsigned	(*get_block_size) (PX_Cipher *pxc);
+	unsigned 	(*get_key_size) (PX_Cipher *pxc);
+	unsigned 	(*get_iv_size) (PX_Cipher *pxc);
+	int			(*encrypt) (PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res);
+	int			(*decrypt) (PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res);
+	void		(*free) (PX_Cipher *pxc);
+
+	/* The mechanism describing the cipher used */
+	union
+	{
+		CK_MECHANISM_TYPE nss;
+		CK_ULONG internal;
+	}			mechanism;
+	int			keylen;
+	bool		is_nss;
+}			cipher_implementation;
+
+typedef struct nss_cipher
+{
+	const cipher_implementation *impl;
+	NSSInitContext *context;
+	PK11Context *crypt_context;
+	SECItem *params;
+
+	PK11SymKey *encrypt_key;
+	PK11SymKey *decrypt_key;
+}			nss_cipher;
+
+typedef struct internal_cipher
+{
+	const cipher_implementation *impl;
+	BlowfishContext	context;
+}			internal_cipher;
+
+typedef struct nss_cipher_ref
+{
+	const char *name;
+	const cipher_implementation *impl;
+} nss_cipher_ref;
+
+/*
+ * Prototypes
+ */
+static unsigned nss_get_iv_size(PX_Cipher *pxc);
+static unsigned nss_get_block_size(PX_Cipher *pxc);
+
+/*
+ * nss_GetHashOidTagByHashType
+ *
+ * Returns the corresponding SECOidTag for the passed hash type. NSS 3.43
+ * includes HASH_GetHashOidTagByHashType for this purpose, but at the time of
+ * writing is not commonly available so we need our own version till then.
+ */
+static SECOidTag
+nss_GetHashOidTagByHashType(HASH_HashType type)
+{
+	if (type == HASH_AlgMD2)
+		return SEC_OID_MD2;
+	if (type == HASH_AlgMD5)
+		return SEC_OID_MD5;
+	if (type == HASH_AlgSHA1)
+		return SEC_OID_SHA1;
+	if (type == HASH_AlgSHA224)
+		return SEC_OID_SHA224;
+	if (type == HASH_AlgSHA256)
+		return SEC_OID_SHA256;
+	if (type == HASH_AlgSHA384)
+		return SEC_OID_SHA384;
+	if (type == HASH_AlgSHA512)
+		return SEC_OID_SHA512;
+
+	return SEC_OID_UNKNOWN;
+}
+
+static unsigned
+nss_digest_block_size(PX_MD *pxmd)
+{
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+	const SECHashObject *object;
+
+	object = HASH_GetHashObject(digest->hash_type);
+	return object->blocklength;
+}
+
+static unsigned
+nss_digest_result_size(PX_MD *pxmd)
+{
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+	const SECHashObject *object;
+
+	object = HASH_GetHashObject(digest->hash_type);
+	return object->length;
+}
+
+static void
+nss_digest_free(PX_MD *pxmd)
+{
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+	PRBool	free_ctx = PR_TRUE;
+
+	PK11_DestroyContext(digest->hash_context, free_ctx);
+	NSS_ShutdownContext(digest->context);
+}
+
+static void
+nss_digest_update(PX_MD *pxmd, const uint8 *data, unsigned dlen)
+{
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+
+	PK11_DigestOp(digest->hash_context, data, dlen);
+}
+
+static void
+nss_digest_reset(PX_MD *pxmd)
+{
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+
+	PK11_DigestBegin(digest->hash_context);
+}
+
+static void
+nss_digest_finish(PX_MD *pxmd, uint8 *dst)
+{
+	unsigned int outlen;
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+	const SECHashObject *object;
+
+	object = HASH_GetHashObject(digest->hash_type);
+	PK11_DigestFinal(digest->hash_context, dst, &outlen, object->length);
+}
+
+int
+px_find_digest(const char *name, PX_MD **res)
+{
+	PX_MD	*pxmd;
+	NSSInitParameters params;
+	NSSInitContext *nss_context;
+	bool found = false;
+	nss_digest *digest;
+	SECStatus status;
+	SECOidData *hash;
+	HASH_HashType t;
+
+	/*
+	 * Initialize our own NSS context without a database backing it.
+	 */
+	memset(&params, 0, sizeof(params));
+	params.length = sizeof(params);
+	nss_context = NSS_InitContext("", "", "", "", &params,
+								  NSS_INIT_READONLY | NSS_INIT_NOCERTDB |
+								  NSS_INIT_NOMODDB | NSS_INIT_FORCEOPEN |
+								  NSS_INIT_NOROOTINIT | NSS_INIT_PK11RELOAD);
+
+	/*
+	 * There is no API function for looking up a digest algorithm from a name
+	 * string, but there is a publically accessible array which can be scanned
+	 * for the name.
+	 */
+	for (t = HASH_AlgNULL + 1; t < HASH_AlgTOTAL; t++)
+	{
+		SECOidTag 	hash_oid;
+		char *p;
+
+		hash_oid = nss_GetHashOidTagByHashType(t);
+
+		if (hash_oid == SEC_OID_UNKNOWN)
+			return PXE_NO_HASH;
+
+		hash = SECOID_FindOIDByTag(hash_oid);
+		if (pg_strcasecmp(hash->desc, name) == 0)
+		{
+			found = true;
+			break;
+		}
+
+		/*
+		 * NSS saves the algorithm names using SHA-xxx notation whereas
+		 * OpenSSL use SHAxxx. To make sure the user finds the requested
+		 * algorithm let's remove the dash and compare that spelling as well.
+		 */
+		if ((p = strchr(hash->desc, '-')) != NULL)
+		{
+			char tmp[12];
+
+			memcpy(tmp, hash->desc, p - hash->desc);
+			memcpy(tmp + (p - hash->desc), p + 1, strlen(hash->desc) - (p - hash->desc) + 1);
+			if (pg_strcasecmp(tmp, name) == 0)
+			{
+				found = true;
+				break;
+			}
+		}
+	}
+
+	if (!found)
+		return PXE_NO_HASH;
+
+	digest = palloc(sizeof(*digest));
+
+	digest->context = nss_context;
+	digest->hash_context = PK11_CreateDigestContext(hash->offset);
+	digest->hash_type = t;
+	if (digest->hash_context == NULL)
+	{
+		pfree(digest);
+		return -1;
+	}
+
+	status = PK11_DigestBegin(digest->hash_context);
+	if (status != SECSuccess)
+	{
+		PK11_DestroyContext(digest->hash_context, PR_TRUE);
+		pfree(digest);
+		return -1;
+	}
+
+	pxmd = palloc(sizeof(*pxmd));
+	pxmd->result_size = nss_digest_result_size;
+	pxmd->block_size = nss_digest_block_size;
+	pxmd->reset = nss_digest_reset;
+	pxmd->update = nss_digest_update;
+	pxmd->finish = nss_digest_finish;
+	pxmd->free = nss_digest_free;
+	pxmd->p.ptr = (void *) digest;
+
+	*res = pxmd;
+
+	return 0;
+}
+
+static int
+bf_init(PX_Cipher *pxc, const uint8 *key, unsigned klen, const uint8 *iv)
+{
+	internal_cipher *cipher = (internal_cipher *) pxc->ptr;
+
+	blowfish_setkey(&cipher->context, key, klen);
+	if (iv)
+		blowfish_setiv(&cipher->context, iv);
+
+	return 0;
+}
+
+static int
+bf_encrypt(PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res)
+{
+	internal_cipher *cipher = (internal_cipher *) pxc->ptr;
+	uint8 *buf;
+
+	if (dlen == 0)
+		return 0;
+
+	if (dlen & 7)
+		return PXE_NOTBLOCKSIZE;
+
+	buf = palloc(dlen);
+	memcpy(buf, data, dlen);
+
+	if (cipher->impl->mechanism.internal == BLOWFISH_ECB)
+		blowfish_encrypt_ecb(buf, dlen, &cipher->context);
+	else
+		blowfish_encrypt_cbc(buf, dlen, &cipher->context);
+
+	memcpy(res, buf, dlen);
+	pfree(buf);
+
+	return 0;
+}
+
+static int
+bf_decrypt(PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res)
+{
+	internal_cipher *cipher = (internal_cipher *) pxc->ptr;
+
+	if (dlen == 0)
+		return 0;
+
+	if (dlen & 7)
+		return PXE_NOTBLOCKSIZE;
+
+	memcpy(res, data, dlen);
+	if (cipher->impl->mechanism.internal == BLOWFISH_ECB)
+		blowfish_decrypt_ecb(res, dlen, &cipher->context);
+	else
+		blowfish_decrypt_cbc(res, dlen, &cipher->context);
+
+	return 0;
+}
+
+static void
+bf_free(PX_Cipher *pxc)
+{
+	internal_cipher *cipher = (internal_cipher *) pxc->ptr;
+
+	pfree(cipher);
+	pfree(pxc);
+}
+
+static int
+nss_symkey_blockcipher_init(PX_Cipher *pxc, const uint8 *key, unsigned klen,
+							const uint8 *iv)
+{
+	nss_cipher	   *cipher = (nss_cipher *) pxc->ptr;
+	SECItem			iv_item;
+	unsigned char  *iv_item_data;
+	SECItem			key_item;
+	int				keylen;
+	PK11SlotInfo   *slot;
+
+	if (cipher->impl->mechanism.nss == CKM_AES_CBC ||
+		cipher->impl->mechanism.nss == CKM_AES_ECB)
+	{
+		if (klen <= 128 / 8)
+			keylen = 128 / 8;
+		else if (klen <= 192 / 8)
+			keylen = 192 / 8;
+		else if (klen <= 256 / 8)
+			keylen = 256 / 8;
+		else
+			return PXE_CIPHER_INIT;
+	}
+	else
+		keylen = cipher->impl->keylen;
+
+	key_item.type = siBuffer;
+	key_item.data = (unsigned char *) key;
+	key_item.len = keylen;
+
+	/*
+	 * If hardware acceleration is configured in NSS one can theoretically get
+	 * a better slot by calling PK11_GetBestSlot() with the mechanism passed
+	 * to it. Unless there are complaints, using the simpler API will make
+	 * error handling easier though.
+	 */
+	slot = PK11_GetInternalSlot();
+	if (!slot)
+		return PXE_CIPHER_INIT;
+
+	/*
+	 * The key must be set up for the operation, and since we don't know at
+	 * this point whether we are asked to encrypt or decrypt we need to store
+	 * both versions.
+	 */
+	cipher->decrypt_key = PK11_ImportSymKey(slot, cipher->impl->mechanism.nss,
+											PK11_OriginUnwrap,
+											CKA_DECRYPT, &key_item,
+											NULL);
+	cipher->encrypt_key = PK11_ImportSymKey(slot, cipher->impl->mechanism.nss,
+											PK11_OriginUnwrap,
+											CKA_ENCRYPT, &key_item,
+											NULL);
+	PK11_FreeSlot(slot);
+
+	if (!cipher->decrypt_key || !cipher->encrypt_key)
+		return PXE_CIPHER_INIT;
+
+	if (iv)
+	{
+		iv_item.type = siBuffer;
+		iv_item.data = (unsigned char *) iv;
+		iv_item.len = nss_get_iv_size(pxc);
+	}
+	else
+	{
+		/*
+		 * The documentation states that either passing .data = 0; .len = 0;
+		 * in the iv_item, or NULL as iv_item, to PK11_ParamFromIV should be
+		 * done when IV is missing. That however leads to segfaults in the
+		 * library, the workaround that works in modern  library versions is
+		 * to pass in a keysized zeroed out IV.
+		 */
+		iv_item_data = palloc0(nss_get_iv_size(pxc));
+		iv_item.type = siBuffer;
+		iv_item.data = iv_item_data;
+		iv_item.len = nss_get_iv_size(pxc);
+	}
+
+	cipher->params = PK11_ParamFromIV(cipher->impl->mechanism.nss, &iv_item);
+
+	/* If we had to make a mock IV, free it once made into a param */
+	if (!iv)
+		pfree(iv_item_data);
+
+	if (cipher->params == NULL)
+		return PXE_CIPHER_INIT;
+
+	return 0;
+}
+
+static int
+nss_decrypt(PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res)
+{
+	nss_cipher *cipher = (nss_cipher *) pxc->ptr;
+	SECStatus	status;
+	int outlen;
+
+	if (!cipher->crypt_context)
+	{
+		cipher->crypt_context =
+			PK11_CreateContextBySymKey(cipher->impl->mechanism.nss, CKA_DECRYPT,
+									   cipher->decrypt_key, cipher->params);
+	}
+
+	status = PK11_CipherOp(cipher->crypt_context, res, &outlen, dlen, data, dlen);
+	if (status != SECSuccess)
+		return PXE_DECRYPT_FAILED;
+
+	return 0;
+}
+
+static int
+nss_encrypt(PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res)
+{
+	nss_cipher *cipher = (nss_cipher *) pxc->ptr;
+	SECStatus	status;
+	int outlen;
+
+	if (!cipher->crypt_context)
+	{
+		cipher->crypt_context =
+			PK11_CreateContextBySymKey(cipher->impl->mechanism.nss, CKA_ENCRYPT,
+									   cipher->decrypt_key, cipher->params);
+	}
+
+	status = PK11_CipherOp(cipher->crypt_context, res, &outlen, dlen, data, dlen);
+
+	if (status != SECSuccess)
+		return PXE_DECRYPT_FAILED;
+
+	return 0;
+}
+
+static void
+nss_free(PX_Cipher *pxc)
+{
+	nss_cipher *cipher = pxc->ptr;
+	PRBool		free_ctx = PR_TRUE;
+
+	PK11_FreeSymKey(cipher->encrypt_key);
+	PK11_FreeSymKey(cipher->decrypt_key);
+	PK11_DestroyContext(cipher->crypt_context, free_ctx);
+	NSS_ShutdownContext(cipher->context);
+	pfree(cipher);
+
+	pfree(pxc);
+}
+
+static unsigned
+nss_get_block_size(PX_Cipher *pxc)
+{
+	nss_cipher *cipher = pxc->ptr;
+
+	return PK11_GetBlockSize(cipher->impl->mechanism.nss, NULL);
+}
+
+static unsigned
+nss_get_key_size(PX_Cipher *pxc)
+{
+	nss_cipher *cipher = pxc->ptr;
+
+	return cipher->impl->keylen;
+}
+
+static unsigned
+nss_get_iv_size(PX_Cipher *pxc)
+{
+	nss_cipher *cipher = pxc->ptr;
+
+	return PK11_GetIVLength(cipher->impl->mechanism.nss);
+}
+
+static unsigned
+bf_get_block_size(PX_Cipher *pxc)
+{
+	return 8;
+}
+
+static unsigned
+bf_get_key_size(PX_Cipher *pxc)
+{
+	return 448 / 8;
+}
+
+static unsigned
+bf_get_iv_size(PX_Cipher *pxc)
+{
+	return 8;
+}
+
+/*
+ * Cipher Implementations
+ */
+static const cipher_implementation nss_des_cbc = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_DES_CBC,
+	.keylen = 8,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_des_ecb = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_DES_ECB,
+	.keylen = 8,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_des3_cbc = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_DES3_CBC,
+	.keylen = 24,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_des3_ecb = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_DES3_ECB,
+	.keylen = 24,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_aes_cbc = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_AES_CBC,
+	.keylen = 32,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_aes_ecb = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_AES_ECB,
+	.keylen = 32,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_bf_ecb = {
+	.init = bf_init,
+	.get_block_size = bf_get_block_size,
+	.get_key_size = bf_get_key_size,
+	.get_iv_size = bf_get_iv_size,
+	.encrypt = bf_encrypt,
+	.decrypt = bf_decrypt,
+	.free = bf_free,
+	.mechanism.internal = BLOWFISH_ECB,
+	.keylen = 56,
+	.is_nss = false
+};
+
+static const cipher_implementation nss_bf_cbc = {
+	.init = bf_init,
+	.get_block_size = bf_get_block_size,
+	.get_key_size = bf_get_key_size,
+	.get_iv_size = bf_get_iv_size,
+	.encrypt = bf_encrypt,
+	.decrypt = bf_decrypt,
+	.free = bf_free,
+	.mechanism.internal = BLOWFISH_CBC,
+	.keylen = 56,
+	.is_nss = false
+};
+
+/*
+ * Lookup table for finding the implementation based on a name. CAST5 as well
+ * as BLOWFISH are defined as cipher mechanisms in NSS but error out with
+ * SEC_ERROR_INVALID_ALGORITHM. Blowfish is implemented using the internal
+ * implementation while CAST5 isn't supported at all at this time,
+ */
+static const nss_cipher_ref nss_cipher_lookup[] = {
+	{"des", &nss_des_cbc},
+	{"des-cbc", &nss_des_cbc},
+	{"des-ecb", &nss_des_ecb},
+	{"des3-cbc", &nss_des3_cbc},
+	{"3des", &nss_des3_cbc},
+	{"3des-cbc", &nss_des3_cbc},
+	{"des3-ecb", &nss_des3_ecb},
+	{"3des-ecb", &nss_des3_ecb},
+	{"aes", &nss_aes_cbc},
+	{"aes-cbc", &nss_aes_cbc},
+	{"aes-ecb", &nss_aes_ecb},
+	{"rijndael", &nss_aes_cbc},
+	{"rijndael-cbc", &nss_aes_cbc},
+	{"rijndael-ecb", &nss_aes_ecb},
+	{"blowfish", &nss_bf_cbc},
+	{"blowfish-cbc", &nss_bf_cbc},
+	{"blowfish-ecb", &nss_bf_ecb},
+	{"bf", &nss_bf_cbc},
+	{"bf-cbc", &nss_bf_cbc},
+	{"bf-ecb", &nss_bf_ecb},
+	{NULL}
+};
+
+/*
+ * px_find_cipher
+ *
+ * Search for the requested cipher and see if there is support for it, and if
+ * so return an allocated object containing the playbook for how to encrypt
+ * and decrypt using the cipher.
+ */
+int
+px_find_cipher(const char *alias, PX_Cipher **res)
+{
+	const nss_cipher_ref *cipher_ref;
+	PX_Cipher  *px_cipher;
+	NSSInitParameters params;
+	NSSInitContext *nss_context;
+	nss_cipher	*cipher;
+	internal_cipher *int_cipher;
+
+	for (cipher_ref = nss_cipher_lookup; cipher_ref->name; cipher_ref++)
+	{
+		if (strcmp(cipher_ref->name, alias) == 0)
+			break;
+	}
+
+	if (!cipher_ref->name)
+		return PXE_NO_CIPHER;
+
+	/*
+	 * Fill in the PX_Cipher to pass back to PX describing the operations to
+	 * perform in order to use the cipher.
+	 */
+	px_cipher = palloc(sizeof(*px_cipher));
+	px_cipher->block_size = cipher_ref->impl->get_block_size;
+	px_cipher->key_size = cipher_ref->impl->get_key_size;
+	px_cipher->iv_size = cipher_ref->impl->get_iv_size;
+	px_cipher->free = cipher_ref->impl->free;
+	px_cipher->init = cipher_ref->impl->init;
+	px_cipher->encrypt = cipher_ref->impl->encrypt;
+	px_cipher->decrypt = cipher_ref->impl->decrypt;
+
+	/*
+	 * Set the private data, which is different for NSS and internal ciphers
+	 */
+	if (cipher_ref->impl->is_nss)
+	{
+		/*
+		 * Initialize our own NSS context without a database backing it. At
+		 * some point we might want to allow users to use stored keys in the
+		 * database rather than passing them via SELECT encrypt(), and then
+		 * this need to be changed to open a user specified database.
+		 */
+		memset(&params, 0, sizeof(params));
+		params.length = sizeof(params);
+		nss_context = NSS_InitContext("", "", "", "", &params,
+									  NSS_INIT_READONLY | NSS_INIT_NOCERTDB |
+									  NSS_INIT_NOMODDB | NSS_INIT_FORCEOPEN |
+									  NSS_INIT_NOROOTINIT | NSS_INIT_PK11RELOAD);
+
+		/* nss_cipher is the private state struct for the operation */
+		cipher = palloc(sizeof(*cipher));
+		cipher->context = nss_context;
+		cipher->impl = cipher_ref->impl;
+		cipher->crypt_context = NULL;
+
+		px_cipher->ptr = cipher;
+	}
+	else
+	{
+		int_cipher = palloc0(sizeof(*int_cipher));
+
+		int_cipher->impl = cipher_ref->impl;
+		px_cipher->ptr = int_cipher;
+	}
+
+	*res = px_cipher;
+	return 0;
+}
diff --git a/contrib/sslinfo/sslinfo.c b/contrib/sslinfo/sslinfo.c
index 30cae0bb98..3aadd90aa6 100644
--- a/contrib/sslinfo/sslinfo.c
+++ b/contrib/sslinfo/sslinfo.c
@@ -9,9 +9,11 @@
 
 #include "postgres.h"
 
+#ifdef USE_OPENSSL
 #include <openssl/x509.h>
 #include <openssl/x509v3.h>
 #include <openssl/asn1.h>
+#endif
 
 #include "access/htup_details.h"
 #include "funcapi.h"
@@ -21,6 +23,7 @@
 
 PG_MODULE_MAGIC;
 
+#ifdef USE_OPENSSL
 static Datum X509_NAME_field_to_text(X509_NAME *name, text *fieldName);
 static Datum ASN1_STRING_to_text(ASN1_STRING *str);
 
@@ -31,6 +34,7 @@ typedef struct
 {
 	TupleDesc	tupdesc;
 } SSLExtensionInfoContext;
+#endif
 
 /*
  * Indicates whether current session uses SSL
@@ -131,6 +135,7 @@ ssl_client_serial(PG_FUNCTION_ARGS)
 }
 
 
+#ifdef USE_OPENSSL
 /*
  * Converts OpenSSL ASN1_STRING structure into text
  *
@@ -282,7 +287,23 @@ ssl_issuer_field(PG_FUNCTION_ARGS)
 	else
 		return result;
 }
+#endif							/* USE_OPENSSL */
 
+#ifdef USE_NSS
+PG_FUNCTION_INFO_V1(ssl_client_dn_field);
+Datum
+ssl_client_dn_field(PG_FUNCTION_ARGS)
+{
+	PG_RETURN_NULL();
+}
+
+PG_FUNCTION_INFO_V1(ssl_issuer_field);
+Datum
+ssl_issuer_field(PG_FUNCTION_ARGS)
+{
+	PG_RETURN_NULL();
+}
+#endif							/* USE_NSS */
 
 /*
  * Returns current client certificate subject as one string
@@ -338,6 +359,7 @@ ssl_issuer_dn(PG_FUNCTION_ARGS)
 }
 
 
+#ifdef USE_OPENSSL
 /*
  * Returns information about available SSL extensions.
  *
@@ -471,3 +493,13 @@ ssl_extension_info(PG_FUNCTION_ARGS)
 	/* All done */
 	SRF_RETURN_DONE(funcctx);
 }
+#endif							/* USE_OPENSSL */
+
+#ifdef USE_NSS
+PG_FUNCTION_INFO_V1(ssl_extension_info);
+Datum
+ssl_extension_info(PG_FUNCTION_ARGS)
+{
+	PG_RETURN_NULL();
+}
+#endif							/* USE_NSS */
diff --git a/doc/src/sgml/pgcrypto.sgml b/doc/src/sgml/pgcrypto.sgml
index 8748c64e2d..f03e1f5fcf 100644
--- a/doc/src/sgml/pgcrypto.sgml
+++ b/doc/src/sgml/pgcrypto.sgml
@@ -45,8 +45,9 @@ digest(data bytea, type text) returns bytea
     <literal>sha224</literal>, <literal>sha256</literal>,
     <literal>sha384</literal> and <literal>sha512</literal>.
     If <filename>pgcrypto</filename> was built with
-    <productname>OpenSSL</productname>, more algorithms are available, as
-    detailed in <xref linkend="pgcrypto-with-without-openssl"/>.
+    <productname>OpenSSL</productname> or <productname>NSS</productname>,
+    more algorithms are available, as
+    detailed in <xref linkend="pgcrypto-with-without-openssl-nss"/>.
    </para>
 
    <para>
@@ -763,7 +764,7 @@ pgp_sym_encrypt(data, psw, 'compress-algo=1, cipher-algo=aes256')
     Which cipher algorithm to use.
    </para>
 <literallayout>
-Values: bf, aes128, aes192, aes256 (OpenSSL-only: <literal>3des</literal>, <literal>cast5</literal>)
+Values: bf, aes128, aes192, aes256 (OpenSSL-only: <literal>3des</literal>, <literal>cast5</literal>; NSS-only: <literal>3des</literal>)
 Default: aes128
 Applies to: pgp_sym_encrypt, pgp_pub_encrypt
 </literallayout>
@@ -1152,8 +1153,8 @@ gen_random_uuid() returns uuid
    <para>
     <filename>pgcrypto</filename> configures itself according to the findings of the
     main PostgreSQL <literal>configure</literal> script.  The options that
-    affect it are <literal>--with-zlib</literal> and
-    <literal>--with-openssl</literal>.
+    affect it are <literal>--with-zlib</literal>,
+    <literal>--with-openssl</literal> and <literal>--with-nss</literal>.
    </para>
 
    <para>
@@ -1168,14 +1169,16 @@ gen_random_uuid() returns uuid
     BIGNUM functions.
    </para>
 
-   <table id="pgcrypto-with-without-openssl">
-    <title>Summary of Functionality with and without OpenSSL</title>
-    <tgroup cols="3">
+   <table id="pgcrypto-with-without-openssl-nss">
+    <title>Summary of Functionality with and without external cryptographic
+      library</title>
+    <tgroup cols="4">
      <thead>
       <row>
        <entry>Functionality</entry>
        <entry>Built-in</entry>
        <entry>With OpenSSL</entry>
+       <entry>With NSS</entry>
       </row>
      </thead>
      <tbody>
@@ -1183,51 +1186,67 @@ gen_random_uuid() returns uuid
        <entry>MD5</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>SHA1</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>SHA224/256/384/512</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>Other digest algorithms</entry>
        <entry>no</entry>
        <entry>yes (Note 1)</entry>
+       <entry>yes (Note 1)</entry>
       </row>
       <row>
        <entry>Blowfish</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>AES</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>DES/3DES/CAST5</entry>
        <entry>no</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
+      </row>
+      <row>
+       <entry>CAST5</entry>
+       <entry>no</entry>
+       <entry>yes</entry>
+       <entry>no</entry>
       </row>
       <row>
        <entry>Raw encryption</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>PGP Symmetric encryption</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>PGP Public-Key encryption</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
      </tbody>
     </tgroup>
@@ -1240,7 +1259,8 @@ gen_random_uuid() returns uuid
    <orderedlist>
     <listitem>
      <para>
-      Any digest algorithm <productname>OpenSSL</productname> supports
+      Any digest algorithm <productname>OpenSSL</productname> and
+      <productname>NSS</productname> supports
       is automatically picked up.
       This is not possible with ciphers, which need to be supported
       explicitly.
diff --git a/doc/src/sgml/sslinfo.sgml b/doc/src/sgml/sslinfo.sgml
index 3213c039ca..d2270cbe7c 100644
--- a/doc/src/sgml/sslinfo.sgml
+++ b/doc/src/sgml/sslinfo.sgml
@@ -22,7 +22,8 @@
 
  <para>
   This extension won't build at all unless the installation was
-  configured with <literal>--with-openssl</literal>.
+  configured with SSL support, such as <literal>--with-openssl</literal>
+  or <literal>--with-nss</literal>.
  </para>
 
  <sect2>
@@ -208,6 +209,9 @@ emailAddress
      the X.500 and X.509 standards, so you cannot just assign arbitrary
      meaning to them.
     </para>
+    <para>
+     This function is only available when using <productname>OpenSSL</productname>.
+    </para>
     </listitem>
    </varlistentry>
 
@@ -223,6 +227,9 @@ emailAddress
      Same as <function>ssl_client_dn_field</function>, but for the certificate issuer
      rather than the certificate subject.
     </para>
+    <para>
+     This function is only available when using <productname>OpenSSL</productname>.
+    </para>
     </listitem>
    </varlistentry>
 
@@ -238,6 +245,9 @@ emailAddress
      Provide information about extensions of client certificate: extension name,
      extension value, and if it is a critical extension.
     </para>
+    <para>
+     This function is only available when using <productname>OpenSSL</productname>.
+    </para>
     </listitem>
    </varlistentry>
   </variablelist>
diff --git a/src/tools/msvc/Install.pm b/src/tools/msvc/Install.pm
index ea3af48777..afe72a7e97 100644
--- a/src/tools/msvc/Install.pm
+++ b/src/tools/msvc/Install.pm
@@ -438,7 +438,8 @@ sub CopyContribFiles
 		{
 			# These configuration-based exclusions must match vcregress.pl
 			next if ($d eq "uuid-ossp"  && !defined($config->{uuid}));
-			next if ($d eq "sslinfo"    && !defined($config->{openssl}));
+			next if ($d eq "sslinfo"    && !defined($config->{openssl})
+			  && !defined($config->{nss}));
 			next if ($d eq "xml2"       && !defined($config->{xml}));
 			next if ($d =~ /_plperl$/   && !defined($config->{perl}));
 			next if ($d =~ /_plpython$/ && !defined($config->{python}));
diff --git a/src/tools/msvc/Mkvcbuild.pm b/src/tools/msvc/Mkvcbuild.pm
index 29879b51af..379f861a56 100644
--- a/src/tools/msvc/Mkvcbuild.pm
+++ b/src/tools/msvc/Mkvcbuild.pm
@@ -442,9 +442,14 @@ sub mkvcbuild
 		push @contrib_excludes, 'xml2';
 	}
 
+	if (!$solution->{options}->{openssl} && !$solution->{options}->{nss})
+	{
+		push @contrib_excludes, 'sslinfo';
+	}
+
 	if (!$solution->{options}->{openssl})
 	{
-		push @contrib_excludes, 'sslinfo', 'ssl_passphrase_callback';
+		push @contrib_excludes, 'ssl_passphrase_callback';
 	}
 
 	if (!$solution->{options}->{uuid})
@@ -474,6 +479,11 @@ sub mkvcbuild
 		$pgcrypto->AddFiles('contrib/pgcrypto', 'openssl.c',
 			'pgp-mpi-openssl.c');
 	}
+	elsif ($solution->{options}->{nss})
+	{
+		$pgcrypto->AddFiles('contrib/pgcrypto', 'nss.c',
+			'pgp-mpi-internal.c', 'imath.c', 'blf.c');
+	}
 	else
 	{
 		$pgcrypto->AddFiles(
-- 
2.21.1 (Apple Git-122.3)

From e18895eb33b3ab6c66c1cd461061096784a62e3a Mon Sep 17 00:00:00 2001
From: Jacob Champion <pchampion@vmware.com>
Date: Wed, 11 Nov 2020 09:56:48 -0800
Subject: [PATCH] init_iolayer: manage fd->secret during close

In debug builds, NSPR's default close implementation for descriptors
checks to make sure that any private fd->secret has been NULLed out,
presumably to prove that NSPR does not leak the last reference to
allocated memory. Add a custom close implementation to handle the Port
that is connected to the fd.
---
 src/backend/libpq/be-secure-nss.c | 18 +++++++++++++++---
 1 file changed, 15 insertions(+), 3 deletions(-)

diff --git a/src/backend/libpq/be-secure-nss.c b/src/backend/libpq/be-secure-nss.c
index 86ac400782..76523e9870 100644
--- a/src/backend/libpq/be-secure-nss.c
+++ b/src/backend/libpq/be-secure-nss.c
@@ -477,9 +477,6 @@ be_tls_open_server(Port *port)
 	if (!layer)
 		goto error;
 
-	/* Store the Port as private data available in callbacks */
-	layer->secret = (void *) port;
-
 	if (PR_PushIOLayer(pr_fd, PR_TOP_IO_LAYER, layer) != PR_SUCCESS)
 	{
 		PR_Close(layer);
@@ -1052,6 +1049,17 @@ pg_ssl_write(PRFileDesc *fd, const void *buf, PRInt32 amount, PRIntn flags,
 	return n_write;
 }
 
+static PRStatus
+pg_ssl_close(PRFileDesc *fd)
+{
+	/*
+	 * Disconnect our private Port from the fd before closing out the stack.
+	 * (Debug builds of NSPR will assert if we do not.)
+	 */
+	fd->secret = NULL;
+	return PR_GetDefaultIOMethods()->close(fd);
+}
+
 static PRFileDesc *
 init_iolayer(Port *port)
 {
@@ -1068,6 +1076,7 @@ init_iolayer(Port *port)
 
 	pr_iomethods.recv = pg_ssl_read;
 	pr_iomethods.send = pg_ssl_write;
+	pr_iomethods.close = pg_ssl_close;
 
 	/*
 	 * Each IO layer must be identified by a unique name, where uniqueness is
@@ -1096,6 +1105,9 @@ init_iolayer(Port *port)
 		return NULL;
 	}
 
+	/* Store the Port as private data available in callbacks */
+	layer->secret = (void *) port;
+
 	return layer;
 }
 
-- 
2.24.1

From 4bc5dc61e8be490b013be5f9b3326faae2dc99c6 Mon Sep 17 00:00:00 2001
From: Jacob Champion <pchampion@vmware.com>
Date: Thu, 12 Nov 2020 12:02:39 -0800
Subject: [PATCH] nss: handle timeouts and disconnections in pgtls_read

PR_IO_TIMEOUT_ERROR was being treated as a hard error, but since we're
explicitly asking PR_Recv() not to wait, we want to treat it as "zero
bytes read" instead.

This case happens relatively often in psql, during PQconsumeInput() --
but the return value of PQconsumeInput() is being ignored during
notification handling, which masks the problem. This also seems to fix
interoperability with OpenSSL servers on my machine, possibly due to
differences in message fragmentation between the implementations?

Also ensure that SOCK_ERRNO_SET() is called in the disconnection case;
read_errno was being set but not used.
---
 src/interfaces/libpq/fe-secure-nss.c | 19 +++++++++++++------
 1 file changed, 13 insertions(+), 6 deletions(-)

diff --git a/src/interfaces/libpq/fe-secure-nss.c b/src/interfaces/libpq/fe-secure-nss.c
index 3090f37f5e..8fc8e138e2 100644
--- a/src/interfaces/libpq/fe-secure-nss.c
+++ b/src/interfaces/libpq/fe-secure-nss.c
@@ -429,15 +429,19 @@ pgtls_read(PGconn *conn, void *ptr, size_t len)
 	if (nread == 0)
 	{
 		read_errno = ECONNRESET;
-		return -1;
+		nread = -1;
 	}
-
-	if (nread == -1)
+	else if (nread == -1)
 	{
 		status = PR_GetError();
 
 		switch (status)
 		{
+			case PR_IO_TIMEOUT_ERROR:
+				/* No data available yet. */
+				nread = 0;
+				break;
+
 			case PR_WOULD_BLOCK_ERROR:
 				read_errno = EWOULDBLOCK;
 				break;
@@ -456,9 +460,12 @@ pgtls_read(PGconn *conn, void *ptr, size_t len)
 				break;
 		}
 
-		printfPQExpBuffer(&conn->errorMessage,
-						  libpq_gettext("TLS read error: %s"),
-						  pg_SSLerrmessage(status));
+		if (nread == -1)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("TLS read error: %s"),
+							  pg_SSLerrmessage(status));
+		}
 	}
 
 	SOCK_ERRNO_SET(read_errno);
-- 
2.24.1

From 23f76c228f54c962a51d176d132207f0ad50e644 Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Wed, 28 Oct 2020 11:18:42 +0100
Subject: [PATCH v19 1/5] NSS Frontend, Backend and build infrastructure

TODO:
	* SCRAM channel binding is implemented but doesn't work
	* Frontend CRL configuration handling
	* Settle on a required version in autoconf
	* Move pg_nss.h to a .c file for both frontend and backend

Daniel Gustafsson, Andrew Dunstan, Jacob Champion
---
 configure                                     |  401 +++++-
 configure.ac                                  |   60 +-
 .../postgres_fdw/expected/postgres_fdw.out    |    2 +-
 src/Makefile.global.in                        |    2 +-
 src/backend/libpq/Makefile                    |    6 +-
 src/backend/libpq/auth.c                      |    7 +
 src/backend/libpq/be-secure-nss.c             | 1207 +++++++++++++++++
 src/backend/libpq/be-secure.c                 |    3 +
 src/backend/libpq/hba.c                       |    2 +-
 src/backend/utils/misc/guc.c                  |   20 +-
 src/common/Makefile                           |    2 +-
 src/include/common/pg_nss.h                   |  175 +++
 src/include/libpq/libpq-be.h                  |   15 +-
 src/include/libpq/libpq.h                     |    3 +
 src/include/pg_config.h.in                    |    3 +
 src/include/pg_config_manual.h                |    5 +-
 src/interfaces/libpq/Makefile                 |   13 +-
 src/interfaces/libpq/fe-connect.c             |    4 +
 src/interfaces/libpq/fe-secure-nss.c          | 1089 +++++++++++++++
 src/interfaces/libpq/fe-secure.c              |    5 +-
 src/interfaces/libpq/libpq-fe.h               |   11 +
 src/interfaces/libpq/libpq-int.h              |   20 +-
 src/tools/msvc/Mkvcbuild.pm                   |   22 +-
 src/tools/msvc/Solution.pm                    |   20 +
 src/tools/msvc/config_default.pl              |    1 +
 25 files changed, 3025 insertions(+), 73 deletions(-)
 create mode 100644 src/backend/libpq/be-secure-nss.c
 create mode 100644 src/include/common/pg_nss.h
 create mode 100644 src/interfaces/libpq/fe-secure-nss.c

diff --git a/configure b/configure
index ace4ed5dec..d99ec29c6a 100755
--- a/configure
+++ b/configure
@@ -654,6 +654,9 @@ LIBOBJS
 UUID_LIBS
 LDAP_LIBS_BE
 LDAP_LIBS_FE
+with_ssl
+NSPR_CONFIG
+NSS_CONFIG
 PTHREAD_CFLAGS
 PTHREAD_LIBS
 PTHREAD_CC
@@ -711,7 +714,6 @@ with_uuid
 with_readline
 with_systemd
 with_selinux
-with_openssl
 with_ldap
 with_krb_srvnam
 krb_srvtab
@@ -856,7 +858,6 @@ with_pam
 with_bsd_auth
 with_ldap
 with_bonjour
-with_openssl
 with_selinux
 with_systemd
 with_readline
@@ -868,6 +869,8 @@ with_libxslt
 with_system_tzdata
 with_zlib
 with_gnu_ld
+with_ssl
+with_openssl
 enable_largefile
 '
       ac_precious_vars='build_alias
@@ -1558,7 +1561,6 @@ Optional Packages:
   --with-bsd-auth         build with BSD Authentication support
   --with-ldap             build with LDAP support
   --with-bonjour          build with Bonjour support
-  --with-openssl          build with OpenSSL support
   --with-selinux          build with SELinux support
   --with-systemd          build with systemd support
   --without-readline      do not use GNU Readline nor BSD Libedit for editing
@@ -1572,6 +1574,8 @@ Optional Packages:
                           use system time zone data in DIR
   --without-zlib          do not use Zlib
   --with-gnu-ld           assume the C compiler uses GNU ld [default=no]
+  --with-ssl=LIB          use LIB for SSL/TLS support (openssl, nss)
+  --with-openssl          obsolete spelling of --with-ssl=openssl
 
 Some influential environment variables:
   CC          C compiler command
@@ -8071,41 +8075,6 @@ fi
 $as_echo "$with_bonjour" >&6; }
 
 
-#
-# OpenSSL
-#
-{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether to build with OpenSSL support" >&5
-$as_echo_n "checking whether to build with OpenSSL support... " >&6; }
-
-
-
-# Check whether --with-openssl was given.
-if test "${with_openssl+set}" = set; then :
-  withval=$with_openssl;
-  case $withval in
-    yes)
-
-$as_echo "#define USE_OPENSSL 1" >>confdefs.h
-
-      ;;
-    no)
-      :
-      ;;
-    *)
-      as_fn_error $? "no argument expected for --with-openssl option" "$LINENO" 5
-      ;;
-  esac
-
-else
-  with_openssl=no
-
-fi
-
-
-{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $with_openssl" >&5
-$as_echo "$with_openssl" >&6; }
-
-
 #
 # SELinux
 #
@@ -12179,7 +12148,64 @@ fi
   fi
 fi
 
+#
+# SSL Library
+#
+# There are currently two supported SSL/TLS libraries, OpenSSL and NSS.
+#
+
+
+
+# Check whether --with-ssl was given.
+if test "${with_ssl+set}" = set; then :
+  withval=$with_ssl;
+  case $withval in
+    yes)
+      as_fn_error $? "argument required for --with-ssl option" "$LINENO" 5
+      ;;
+    no)
+      as_fn_error $? "argument required for --with-ssl option" "$LINENO" 5
+      ;;
+    *)
+
+      ;;
+  esac
+
+fi
+
+
+if test x"$with_ssl" = x"" ; then
+  with_ssl=no
+fi
+
+
+
+# Check whether --with-openssl was given.
+if test "${with_openssl+set}" = set; then :
+  withval=$with_openssl;
+  case $withval in
+    yes)
+      :
+      ;;
+    no)
+      :
+      ;;
+    *)
+      as_fn_error $? "no argument expected for --with-openssl option" "$LINENO" 5
+      ;;
+  esac
+
+else
+  with_openssl=no
+
+fi
+
+
 if test "$with_openssl" = yes ; then
+  with_ssl=openssl
+fi
+
+if test "$with_ssl" = openssl ; then
     # Minimum required OpenSSL version is 1.0.1
 
 $as_echo "#define OPENSSL_API_COMPAT 0x10001000L" >>confdefs.h
@@ -12440,8 +12466,280 @@ _ACEOF
 fi
 done
 
+
+$as_echo "#define USE_OPENSSL 1" >>confdefs.h
+
+elif test "$with_ssl" = nss ; then
+  # TODO: fallback in case nss-config/nspr-config aren't found.
+  if test -z "$NSS_CONFIG"; then
+  for ac_prog in nss-config
+do
+  # Extract the first word of "$ac_prog", so it can be a program name with args.
+set dummy $ac_prog; ac_word=$2
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
+$as_echo_n "checking for $ac_word... " >&6; }
+if ${ac_cv_path_NSS_CONFIG+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  case $NSS_CONFIG in
+  [\\/]* | ?:[\\/]*)
+  ac_cv_path_NSS_CONFIG="$NSS_CONFIG" # Let the user override the test with a path.
+  ;;
+  *)
+  as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH
+do
+  IFS=$as_save_IFS
+  test -z "$as_dir" && as_dir=.
+    for ac_exec_ext in '' $ac_executable_extensions; do
+  if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
+    ac_cv_path_NSS_CONFIG="$as_dir/$ac_word$ac_exec_ext"
+    $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
+    break 2
+  fi
+done
+  done
+IFS=$as_save_IFS
+
+  ;;
+esac
+fi
+NSS_CONFIG=$ac_cv_path_NSS_CONFIG
+if test -n "$NSS_CONFIG"; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $NSS_CONFIG" >&5
+$as_echo "$NSS_CONFIG" >&6; }
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
 fi
 
+
+  test -n "$NSS_CONFIG" && break
+done
+
+else
+  # Report the value of NSS_CONFIG in configure's output in all cases.
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for NSS_CONFIG" >&5
+$as_echo_n "checking for NSS_CONFIG... " >&6; }
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $NSS_CONFIG" >&5
+$as_echo "$NSS_CONFIG" >&6; }
+fi
+
+  if test -z "$NSPR_CONFIG"; then
+  for ac_prog in nspr-config
+do
+  # Extract the first word of "$ac_prog", so it can be a program name with args.
+set dummy $ac_prog; ac_word=$2
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
+$as_echo_n "checking for $ac_word... " >&6; }
+if ${ac_cv_path_NSPR_CONFIG+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  case $NSPR_CONFIG in
+  [\\/]* | ?:[\\/]*)
+  ac_cv_path_NSPR_CONFIG="$NSPR_CONFIG" # Let the user override the test with a path.
+  ;;
+  *)
+  as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH
+do
+  IFS=$as_save_IFS
+  test -z "$as_dir" && as_dir=.
+    for ac_exec_ext in '' $ac_executable_extensions; do
+  if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
+    ac_cv_path_NSPR_CONFIG="$as_dir/$ac_word$ac_exec_ext"
+    $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
+    break 2
+  fi
+done
+  done
+IFS=$as_save_IFS
+
+  ;;
+esac
+fi
+NSPR_CONFIG=$ac_cv_path_NSPR_CONFIG
+if test -n "$NSPR_CONFIG"; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $NSPR_CONFIG" >&5
+$as_echo "$NSPR_CONFIG" >&6; }
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+fi
+
+
+  test -n "$NSPR_CONFIG" && break
+done
+
+else
+  # Report the value of NSPR_CONFIG in configure's output in all cases.
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for NSPR_CONFIG" >&5
+$as_echo_n "checking for NSPR_CONFIG... " >&6; }
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $NSPR_CONFIG" >&5
+$as_echo "$NSPR_CONFIG" >&6; }
+fi
+
+  if test -n "$NSS_CONFIG"; then
+    NSS_LIBS=`$NSS_CONFIG --libs`
+	NSS_CFLAGS=`$NSS_CONFIG --cflags`
+  fi
+  if test -n "$NSPR_CONFIG"; then
+	NSPR_LIBS=`$NSPR_CONFIG --libs`
+	NSPR_CFLAGS=`$NSPR_CONFIG --cflags`
+  fi
+
+  LDFLAGS="$LDFLAGS $NSS_LIBS $NSPR_LIBS"
+  CFLAGS="$CFLAGS $NSS_CFLAGS $NSPR_CFLAGS"
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for NSS_InitContext in -lnss3" >&5
+$as_echo_n "checking for NSS_InitContext in -lnss3... " >&6; }
+if ${ac_cv_lib_nss3_NSS_InitContext+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lnss3  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char NSS_InitContext ();
+int
+main ()
+{
+return NSS_InitContext ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_lib_nss3_NSS_InitContext=yes
+else
+  ac_cv_lib_nss3_NSS_InitContext=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_nss3_NSS_InitContext" >&5
+$as_echo "$ac_cv_lib_nss3_NSS_InitContext" >&6; }
+if test "x$ac_cv_lib_nss3_NSS_InitContext" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_LIBNSS3 1
+_ACEOF
+
+  LIBS="-lnss3 $LIBS"
+
+else
+  as_fn_error $? "library 'nss3' is required for NSS" "$LINENO" 5
+fi
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for PR_GetDefaultIOMethods in -lnspr4" >&5
+$as_echo_n "checking for PR_GetDefaultIOMethods in -lnspr4... " >&6; }
+if ${ac_cv_lib_nspr4_PR_GetDefaultIOMethods+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lnspr4  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char PR_GetDefaultIOMethods ();
+int
+main ()
+{
+return PR_GetDefaultIOMethods ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_lib_nspr4_PR_GetDefaultIOMethods=yes
+else
+  ac_cv_lib_nspr4_PR_GetDefaultIOMethods=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_nspr4_PR_GetDefaultIOMethods" >&5
+$as_echo "$ac_cv_lib_nspr4_PR_GetDefaultIOMethods" >&6; }
+if test "x$ac_cv_lib_nspr4_PR_GetDefaultIOMethods" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_LIBNSPR4 1
+_ACEOF
+
+  LIBS="-lnspr4 $LIBS"
+
+else
+  as_fn_error $? "library 'nspr4' is required for NSS" "$LINENO" 5
+fi
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for SSL_GetImplementedCiphers in -lssl3" >&5
+$as_echo_n "checking for SSL_GetImplementedCiphers in -lssl3... " >&6; }
+if ${ac_cv_lib_ssl3_SSL_GetImplementedCiphers+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lssl3  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char SSL_GetImplementedCiphers ();
+int
+main ()
+{
+return SSL_GetImplementedCiphers ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_lib_ssl3_SSL_GetImplementedCiphers=yes
+else
+  ac_cv_lib_ssl3_SSL_GetImplementedCiphers=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_ssl3_SSL_GetImplementedCiphers" >&5
+$as_echo "$ac_cv_lib_ssl3_SSL_GetImplementedCiphers" >&6; }
+if test "x$ac_cv_lib_ssl3_SSL_GetImplementedCiphers" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_LIBSSL3 1
+_ACEOF
+
+  LIBS="-lssl3 $LIBS"
+
+else
+  as_fn_error $? "library 'ssl3' is required for NSS" "$LINENO" 5
+fi
+
+
+$as_echo "#define USE_NSS 1" >>confdefs.h
+
+elif test "$with_ssl" != no ; then
+  as_fn_error $? "--with-ssl must specify one of openssl or nss" "$LINENO" 5
+fi
+
+
 if test "$with_pam" = yes ; then
   { $as_echo "$as_me:${as_lineno-$LINENO}: checking for pam_start in -lpam" >&5
 $as_echo_n "checking for pam_start in -lpam... " >&6; }
@@ -13327,7 +13625,7 @@ done
 
 fi
 
-if test "$with_openssl" = yes ; then
+if test "$with_ssl" = openssl ; then
   ac_fn_c_check_header_mongrel "$LINENO" "openssl/ssl.h" "ac_cv_header_openssl_ssl_h" "$ac_includes_default"
 if test "x$ac_cv_header_openssl_ssl_h" = xyes; then :
 
@@ -13344,6 +13642,25 @@ else
 fi
 
 
+fi
+
+if test "$with_ssl" = nss ; then
+  ac_fn_c_check_header_mongrel "$LINENO" "nss/ssl.h" "ac_cv_header_nss_ssl_h" "$ac_includes_default"
+if test "x$ac_cv_header_nss_ssl_h" = xyes; then :
+
+else
+  as_fn_error $? "header file <nss/ssl.h> is required for NSS" "$LINENO" 5
+fi
+
+
+  ac_fn_c_check_header_mongrel "$LINENO" "nss/nss.h" "ac_cv_header_nss_nss_h" "$ac_includes_default"
+if test "x$ac_cv_header_nss_nss_h" = xyes; then :
+
+else
+  as_fn_error $? "header file <nss/nss.h> is required for NSS" "$LINENO" 5
+fi
+
+
 fi
 
 if test "$with_pam" = yes ; then
@@ -18061,11 +18378,13 @@ fi
 # in the template or configure command line.
 
 # If not selected manually, try to select a source automatically.
-if test x"$USE_OPENSSL_RANDOM" = x"" && test x"$USE_WIN32_RANDOM" = x"" && test x"$USE_DEV_URANDOM" = x"" ; then
-  if test x"$with_openssl" = x"yes" ; then
+if test x"$USE_OPENSSL_RANDOM" = x"" && test x"$USE_WIN32_RANDOM" = x"" && test x"$USE_DEV_URANDOM" = x"" && test x"$USE_NSS_RANDOM" = x"" ; then
+  if test x"$with_ssl" = x"openssl" ; then
     USE_OPENSSL_RANDOM=1
   elif test "$PORTNAME" = "win32" ; then
     USE_WIN32_RANDOM=1
+  elif test x"$with_ssl" = x"nss" ; then
+    USE_NSS_RANDOM=1
   else
     { $as_echo "$as_me:${as_lineno-$LINENO}: checking for /dev/urandom" >&5
 $as_echo_n "checking for /dev/urandom... " >&6; }
diff --git a/configure.ac b/configure.ac
index 5b91c83fd0..7b9f4b10a3 100644
--- a/configure.ac
+++ b/configure.ac
@@ -852,15 +852,6 @@ PGAC_ARG_BOOL(with, bonjour, no,
 AC_MSG_RESULT([$with_bonjour])
 
 
-#
-# OpenSSL
-#
-AC_MSG_CHECKING([whether to build with OpenSSL support])
-PGAC_ARG_BOOL(with, openssl, no, [build with OpenSSL support],
-              [AC_DEFINE([USE_OPENSSL], 1, [Define to build with OpenSSL support. (--with-openssl)])])
-AC_MSG_RESULT([$with_openssl])
-AC_SUBST(with_openssl)
-
 #
 # SELinux
 #
@@ -1209,7 +1200,21 @@ if test "$with_gssapi" = yes ; then
   fi
 fi
 
+#
+# SSL Library
+#
+# There are currently two supported SSL/TLS libraries, OpenSSL and NSS.
+#
+PGAC_ARG_REQ(with, ssl, [LIB], [use LIB for SSL/TLS support (openssl, nss)])
+if test x"$with_ssl" = x"" ; then
+  with_ssl=no
+fi
+PGAC_ARG_BOOL(with, openssl, no, [obsolete spelling of --with-ssl=openssl])
 if test "$with_openssl" = yes ; then
+  with_ssl=openssl
+fi
+
+if test "$with_ssl" = openssl ; then
   dnl Order matters!
   # Minimum required OpenSSL version is 1.0.1
   AC_DEFINE(OPENSSL_API_COMPAT, [0x10001000L],
@@ -1233,7 +1238,31 @@ if test "$with_openssl" = yes ; then
   # thread-safety. In 1.1.0, it's no longer required, and CRYPTO_lock()
   # function was removed.
   AC_CHECK_FUNCS([CRYPTO_lock])
+  AC_DEFINE([USE_OPENSSL], 1, [Define to 1 if you have OpenSSL support.])
+elif test "$with_ssl" = nss ; then
+  # TODO: fallback in case nss-config/nspr-config aren't found.
+  PGAC_PATH_PROGS(NSS_CONFIG, nss-config)
+  PGAC_PATH_PROGS(NSPR_CONFIG, nspr-config)
+  if test -n "$NSS_CONFIG"; then
+    NSS_LIBS=`$NSS_CONFIG --libs`
+	NSS_CFLAGS=`$NSS_CONFIG --cflags`
+  fi
+  if test -n "$NSPR_CONFIG"; then
+	NSPR_LIBS=`$NSPR_CONFIG --libs`
+	NSPR_CFLAGS=`$NSPR_CONFIG --cflags`
+  fi
+
+  LDFLAGS="$LDFLAGS $NSS_LIBS $NSPR_LIBS"
+  CFLAGS="$CFLAGS $NSS_CFLAGS $NSPR_CFLAGS"
+
+  AC_CHECK_LIB(nss3, NSS_InitContext, [], [AC_MSG_ERROR([library 'nss3' is required for NSS])])
+  AC_CHECK_LIB(nspr4, PR_GetDefaultIOMethods, [], [AC_MSG_ERROR([library 'nspr4' is required for NSS])])
+  AC_CHECK_LIB(ssl3, SSL_GetImplementedCiphers, [], [AC_MSG_ERROR([library 'ssl3' is required for NSS])])
+  AC_DEFINE([USE_NSS], 1, [Define to 1 if you have NSS support,])
+elif test "$with_ssl" != no ; then
+  AC_MSG_ERROR([--with-ssl must specify one of openssl or nss])
 fi
+AC_SUBST(with_ssl)
 
 if test "$with_pam" = yes ; then
   AC_CHECK_LIB(pam,    pam_start, [], [AC_MSG_ERROR([library 'pam' is required for PAM])])
@@ -1405,11 +1434,16 @@ if test "$with_gssapi" = yes ; then
 	[AC_CHECK_HEADERS(gssapi.h, [], [AC_MSG_ERROR([gssapi.h header file is required for GSSAPI])])])
 fi
 
-if test "$with_openssl" = yes ; then
+if test "$with_ssl" = openssl ; then
   AC_CHECK_HEADER(openssl/ssl.h, [], [AC_MSG_ERROR([header file <openssl/ssl.h> is required for OpenSSL])])
   AC_CHECK_HEADER(openssl/err.h, [], [AC_MSG_ERROR([header file <openssl/err.h> is required for OpenSSL])])
 fi
 
+if test "$with_ssl" = nss ; then
+  AC_CHECK_HEADER(nss/ssl.h, [], [AC_MSG_ERROR([header file <nss/ssl.h> is required for NSS])])
+  AC_CHECK_HEADER(nss/nss.h, [], [AC_MSG_ERROR([header file <nss/nss.h> is required for NSS])])
+fi
+
 if test "$with_pam" = yes ; then
   AC_CHECK_HEADERS(security/pam_appl.h, [],
                    [AC_CHECK_HEADERS(pam/pam_appl.h, [],
@@ -2158,11 +2192,13 @@ fi
 # in the template or configure command line.
 
 # If not selected manually, try to select a source automatically.
-if test x"$USE_OPENSSL_RANDOM" = x"" && test x"$USE_WIN32_RANDOM" = x"" && test x"$USE_DEV_URANDOM" = x"" ; then
-  if test x"$with_openssl" = x"yes" ; then
+if test x"$USE_OPENSSL_RANDOM" = x"" && test x"$USE_WIN32_RANDOM" = x"" && test x"$USE_DEV_URANDOM" = x"" && test x"$USE_NSS_RANDOM" = x"" ; then
+  if test x"$with_ssl" = x"openssl" ; then
     USE_OPENSSL_RANDOM=1
   elif test "$PORTNAME" = "win32" ; then
     USE_WIN32_RANDOM=1
+  elif test x"$with_ssl" = x"nss" ; then
+    USE_NSS_RANDOM=1
   else
     AC_CHECK_FILE([/dev/urandom], [], [])
 
diff --git a/contrib/postgres_fdw/expected/postgres_fdw.out b/contrib/postgres_fdw/expected/postgres_fdw.out
index 2d88d06358..984efc0d7e 100644
--- a/contrib/postgres_fdw/expected/postgres_fdw.out
+++ b/contrib/postgres_fdw/expected/postgres_fdw.out
@@ -8911,7 +8911,7 @@ DO $d$
     END;
 $d$;
 ERROR:  invalid option "password"
-HINT:  Valid options in this context are: service, passfile, channel_binding, connect_timeout, dbname, host, hostaddr, port, options, application_name, keepalives, keepalives_idle, keepalives_interval, keepalives_count, tcp_user_timeout, sslmode, sslcompression, sslcert, sslkey, sslrootcert, sslcrl, requirepeer, ssl_min_protocol_version, ssl_max_protocol_version, gssencmode, krbsrvname, gsslib, target_session_attrs, use_remote_estimate, fdw_startup_cost, fdw_tuple_cost, extensions, updatable, fetch_size
+HINT:  Valid options in this context are: service, passfile, channel_binding, connect_timeout, dbname, host, hostaddr, port, options, application_name, keepalives, keepalives_idle, keepalives_interval, keepalives_count, tcp_user_timeout, sslmode, sslcompression, sslcert, sslkey, sslrootcert, sslcrl, requirepeer, ssl_min_protocol_version, ssl_max_protocol_version, gssencmode, krbsrvname, gsslib, target_session_attrs, cert_database, use_remote_estimate, fdw_startup_cost, fdw_tuple_cost, extensions, updatable, fetch_size
 CONTEXT:  SQL statement "ALTER SERVER loopback_nopw OPTIONS (ADD password 'dummypw')"
 PL/pgSQL function inline_code_block line 3 at EXECUTE
 -- If we add a password for our user mapping instead, we should get a different
diff --git a/src/Makefile.global.in b/src/Makefile.global.in
index 7ca1e9aac5..bdab2a6825 100644
--- a/src/Makefile.global.in
+++ b/src/Makefile.global.in
@@ -183,7 +183,7 @@ with_icu	= @with_icu@
 with_perl	= @with_perl@
 with_python	= @with_python@
 with_tcl	= @with_tcl@
-with_openssl	= @with_openssl@
+with_ssl	= @with_ssl@
 with_readline	= @with_readline@
 with_selinux	= @with_selinux@
 with_systemd	= @with_systemd@
diff --git a/src/backend/libpq/Makefile b/src/backend/libpq/Makefile
index efc5ef760a..045d2c2f6b 100644
--- a/src/backend/libpq/Makefile
+++ b/src/backend/libpq/Makefile
@@ -28,8 +28,12 @@ OBJS = \
 	pqmq.o \
 	pqsignal.o
 
-ifeq ($(with_openssl),yes)
+ifeq ($(with_ssl),openssl)
 OBJS += be-secure-openssl.o
+else
+ifeq ($(with_ssl),nss)
+OBJS += be-secure-nss.o
+endif
 endif
 
 ifeq ($(with_gssapi),yes)
diff --git a/src/backend/libpq/auth.c b/src/backend/libpq/auth.c
index d132c5cb48..d476101583 100644
--- a/src/backend/libpq/auth.c
+++ b/src/backend/libpq/auth.c
@@ -2870,7 +2870,14 @@ CheckCertAuth(Port *port)
 {
 	int			status_check_usermap = STATUS_ERROR;
 
+#if defined(USE_OPENSSL)
 	Assert(port->ssl);
+#elif defined(USE_NSS)
+	/* TODO: should we rename pr_fd to ssl, to keep consistency? */
+	Assert(port->pr_fd);
+#else
+	Assert(false);
+#endif
 
 	/* Make sure we have received a username in the certificate */
 	if (port->peer_cn == NULL ||
diff --git a/src/backend/libpq/be-secure-nss.c b/src/backend/libpq/be-secure-nss.c
new file mode 100644
index 0000000000..e7540c4756
--- /dev/null
+++ b/src/backend/libpq/be-secure-nss.c
@@ -0,0 +1,1207 @@
+/*-------------------------------------------------------------------------
+ *
+ * be-secure-nss.c
+ *	  functions for supporting NSS as a TLS backend
+ *
+ *
+ * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ *	  src/backend/libpq/be-secure-nss.c
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#include "postgres.h"
+
+#include <sys/stat.h>
+
+/*
+ * BITS_PER_BYTE is also defined in the NSPR header files, so we need to undef
+ * our version to avoid compiler warnings on redefinition.
+ */
+#define pg_BITS_PER_BYTE BITS_PER_BYTE
+#undef BITS_PER_BYTE
+
+/*
+ * The nspr/obsolete/protypes.h NSPR header typedefs uint64 and int64 with
+ * colliding definitions from ours, causing a much expected compiler error.
+ * Remove backwards compatibility with ancient NSPR versions to avoid this.
+ */
+#define NO_NSPR_10_SUPPORT
+#include <nspr/nspr.h>
+#include <nspr/prerror.h>
+#include <nspr/prio.h>
+#include <nspr/prmem.h>
+#include <nspr/prtypes.h>
+
+#include <nss/nss.h>
+#include <nss/base64.h>
+#include <nss/cert.h>
+#include <nss/certdb.h>
+#include <nss/hasht.h>
+#include <nss/keyhi.h>
+#include <nss/pk11pub.h>
+#include <nss/secder.h>
+#include <nss/secerr.h>
+#include <nss/secitem.h>
+#include <nss/secoidt.h>
+#include <nss/secport.h>
+#include <nss/ssl.h>
+#include <nss/sslerr.h>
+#include <nss/sslproto.h>
+
+/*
+ * Ensure that the colliding definitions match, else throw an error. In case
+ * NSPR has removed the definition for some reason, make sure to put ours
+ * back again.
+ */
+#if defined(BITS_PER_BYTE)
+#if BITS_PER_BYTE != pg_BITS_PER_BYTE
+#error "incompatible byte widths between NSPR and postgres"
+#endif
+#else
+#define BITS_PER_BYTE pg_BITS_PER_BYTE
+#endif
+#undef pg_BITS_PER_BYTE
+
+#include "common/pg_nss.h"
+#include "lib/stringinfo.h"
+#include "libpq/libpq.h"
+#include "nodes/pg_list.h"
+#include "miscadmin.h"
+#include "storage/fd.h"
+#include "utils/guc.h"
+#include "utils/memutils.h"
+
+
+/* default init hook can be overridden by a shared library */
+static void default_nss_tls_init(bool isServerStart);
+nss_tls_init_hook_type nss_tls_init_hook = default_nss_tls_init;
+
+static PRDescIdentity pr_id;
+
+static PRIOMethods pr_iomethods;
+static NSSInitContext * nss_context = NULL;
+static SSLVersionRange desired_sslver;
+
+static char *external_ssl_passphrase_cb(PK11SlotInfo *slot, PRBool retry, void *arg);
+static bool dummy_ssl_passwd_cb_called = false;
+static bool ssl_is_server_start;
+
+/*
+ * PR_ImportTCPSocket() is a private API, but very widely used, as it's the
+ * only way to make NSS use an already set up POSIX file descriptor rather
+ * than opening one itself. To quote the NSS documentation:
+ *
+ *		"In theory, code that uses PR_ImportTCPSocket may break when NSPR's
+ *		implementation changes. In practice, this is unlikely to happen because
+ *		NSPR's implementation has been stable for years and because of NSPR's
+ *		strong commitment to backward compatibility."
+ *
+ * https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSPR/Reference/PR_ImportTCPSocket
+ *
+ * The function is declared in <private/pprio.h>, but as it is a header marked
+ * private we declare it here rather than including it.
+ */
+NSPR_API(PRFileDesc *) PR_ImportTCPSocket(int);
+
+/* NSS IO layer callback overrides */
+static PRInt32 pg_ssl_read(PRFileDesc * fd, void *buf, PRInt32 amount,
+						   PRIntn flags, PRIntervalTime timeout);
+static PRInt32 pg_ssl_write(PRFileDesc * fd, const void *buf, PRInt32 amount,
+							PRIntn flags, PRIntervalTime timeout);
+static PRStatus pg_ssl_close(PRFileDesc * fd);
+/* Utility functions */
+static PRFileDesc * init_iolayer(Port *port);
+static uint16 ssl_protocol_version_to_nss(int v, const char *guc_name);
+
+static char *pg_SSLerrmessage(PRErrorCode errcode);
+static char *ssl_protocol_version_to_string(int v);
+static SECStatus pg_cert_auth_handler(void *arg, PRFileDesc * fd,
+									  PRBool checksig, PRBool isServer);
+static SECStatus pg_bad_cert_handler(void *arg, PRFileDesc * fd);
+static char *dummy_ssl_passphrase_cb(PK11SlotInfo * slot, PRBool retry, void *arg);
+
+/* ------------------------------------------------------------ */
+/*						 Public interface						*/
+/* ------------------------------------------------------------ */
+
+/*
+ * be_tls_init
+ *			Initialize the nss TLS library in the postmaster
+ *
+ * The majority of the setup needs to happen in be_tls_open_server since the
+ * NSPR initialization must happen after the forking of the backend. We could
+ * potentially move some parts in under !isServerStart, but so far this is the
+ * separation chosen.
+ */
+int
+be_tls_init(bool isServerStart)
+{
+	SECStatus	status;
+	SSLVersionRange supported_sslver;
+
+	status = SSL_ConfigServerSessionIDCacheWithOpt(0, 0, NULL, 1, 0, 0, PR_FALSE);
+	if (status != SECSuccess)
+	{
+		ereport(isServerStart ? FATAL : LOG,
+				(errmsg("unable to connect to TLS connection cache: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+		return -1;
+	}
+
+	if (!ssl_database || strlen(ssl_database) == 0)
+	{
+		ereport(isServerStart ? FATAL : LOG,
+				(errmsg("no certificate database specified")));
+		return -1;
+	}
+
+	/*
+	 * We check for the desired TLS version range here, even though we cannot
+	 * set it until be_open_server such that we can be compatible with how the
+	 * OpenSSL backend reports errors for incompatible range configurations.
+	 * Set either the default supported TLS version range, or the configured
+	 * range from ssl_min_protocol_version and ssl_max_protocol version. In
+	 * case the user hasn't defined the maximum allowed version we fall back
+	 * to the highest version TLS that the library supports.
+	 */
+	if (SSL_VersionRangeGetSupported(ssl_variant_stream, &supported_sslver) != SECSuccess)
+	{
+		ereport(isServerStart ? FATAL : LOG,
+				(errmsg("unable to get default protocol support from NSS")));
+		return -1;
+	}
+
+	/*
+	 * Set the fallback versions for the TLS protocol version range to a
+	 * combination of our minimal requirement and the library maximum.
+	 */
+	desired_sslver.min = SSL_LIBRARY_VERSION_TLS_1_0;
+	desired_sslver.max = supported_sslver.max;
+
+	if (ssl_min_protocol_version)
+	{
+		int			ver = ssl_protocol_version_to_nss(ssl_min_protocol_version,
+													  "ssl_min_protocol_version");
+
+		if (ver == -1)
+		{
+			ereport(isServerStart ? FATAL : LOG,
+					(errmsg("\"%s\" setting \"%s\" not supported by this build",
+							"ssl_min_protocol_version",
+							GetConfigOption("ssl_min_protocol_version",
+											false, false))));
+			return -1;
+		}
+
+		if (ver > 0)
+			desired_sslver.min = ver;
+	}
+
+	if (ssl_max_protocol_version)
+	{
+		int			ver = ssl_protocol_version_to_nss(ssl_max_protocol_version,
+													  "ssl_max_protocol_version");
+
+		if (ver == -1)
+		{
+			ereport(isServerStart ? FATAL : LOG,
+					(errmsg("\"%s\" setting \"%s\" not supported by this build",
+							"ssl_max_protocol_version",
+							GetConfigOption("ssl_max_protocol_version",
+											false, false))));
+			return -1;
+		}
+		if (ver > 0)
+			desired_sslver.max = ver;
+
+		if (ver < desired_sslver.min)
+		{
+			ereport(isServerStart ? FATAL : LOG,
+					(errmsg("could not set SSL protocol version range"),
+					 errdetail("\"%s\" cannot be higher than \"%s\"",
+							   "ssl_min_protocol_version",
+							   "ssl_max_protocol_version")));
+			return -1;
+		}
+	}
+
+	/*
+	 * Set the passphrase callback which will be used both to obtain the
+	 * passphrase from the user, as well as by NSS to obtain the phrase
+	 * repeatedly.
+	 */
+	ssl_is_server_start = isServerStart;
+	(*nss_tls_init_hook) (isServerStart);
+
+	return 0;
+}
+
+int
+be_tls_open_server(Port *port)
+{
+	SECStatus	status;
+	PRFileDesc *model;
+	PRFileDesc *pr_fd;
+	PRFileDesc *layer;
+	CERTCertificate *server_cert;
+	SECKEYPrivateKey *private_key;
+	CERTSignedCrl *crl;
+	SECItem		crlname;
+	char	   *cert_database;
+	NSSInitParameters params;
+
+	/*
+	 * The NSPR documentation states that runtime initialization via PR_Init
+	 * is no longer required, as the first caller into NSPR will perform the
+	 * initialization implicitly. The documentation doesn't however clarify
+	 * from which version this is holds true, so let's perform the potentially
+	 * superfluous initialization anyways to avoid crashing on older versions
+	 * of NSPR, as there is no difference in overhead.  The NSS documentation
+	 * still states that PR_Init must be called in some way (implicitly or
+	 * explicitly).
+	 *
+	 * The below parameters are what the implicit initialization would've done
+	 * for us, and should work even for older versions where it might not be
+	 * done automatically. The last parameter, maxPTDs, is set to various
+	 * values in other codebases, but has been unused since NSPR 2.1 which was
+	 * released sometime in 1998. In current versions of NSPR all parameters
+	 * are ignored.
+	 */
+	PR_Init(PR_USER_THREAD, PR_PRIORITY_NORMAL, 0 /* maxPTDs */ );
+
+	/*
+	 * The certificate path (configdir) must contain a valid NSS database. If
+	 * the certificate path isn't a valid directory, NSS will fall back on the
+	 * system certificate database. If the certificate path is a directory but
+	 * is empty then the initialization will fail. On the client side this can
+	 * be allowed for any sslmode but the verify-xxx ones.
+	 * https://bugzilla.redhat.com/show_bug.cgi?id=728562 For the server side
+	 * we won't allow this to fail however, as we require the certificate and
+	 * key to exist.
+	 *
+	 * The original design of NSS was for a single application to use a single
+	 * copy of it, initialized with NSS_Initialize() which isn't returning any
+	 * handle with which to refer to NSS. NSS initialization and shutdown are
+	 * global for the application, so a shutdown in another NSS enabled
+	 * library would cause NSS to be stopped for libpq as well.  The fix has
+	 * been to introduce NSS_InitContext which returns a context handle to
+	 * pass to NSS_ShutdownContext.  NSS_InitContext was introduced in NSS
+	 * 3.12, but the use of it is not very well documented.
+	 * https://bugzilla.redhat.com/show_bug.cgi?id=738456
+	 *
+	 * The InitParameters struct passed can be used to override internal
+	 * values in NSS, but the usage is not documented at all. When using
+	 * NSS_Init initializations, the values are instead set via PK11_Configure
+	 * calls so the PK11_Configure documentation can be used to glean some
+	 * details on these.
+	 *
+	 * https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS/PKCS11/Module_Specs
+	 */
+	memset(&params, '\0', sizeof(params));
+	params.length = sizeof(params);
+
+	if (!ssl_database || strlen(ssl_database) == 0)
+		ereport(FATAL,
+				(errmsg("no certificate database specified")));
+
+	cert_database = psprintf("sql:%s", ssl_database);
+	nss_context = NSS_InitContext(cert_database, "", "", "",
+								  &params,
+								  NSS_INIT_READONLY | NSS_INIT_PK11RELOAD);
+	pfree(cert_database);
+
+	if (!nss_context)
+		ereport(FATAL,
+				(errmsg("unable to read certificate database \"%s\": %s",
+						ssl_database, pg_SSLerrmessage(PR_GetError()))));
+
+	/*
+	 * Import the already opened socket as we don't want to use NSPR functions
+	 * for opening the network socket due to how the PostgreSQL protocol works
+	 * with TLS connections. This function is not part of the NSPR public API,
+	 * see the comment at the top of the file for the rationale of still using
+	 * it.
+	 */
+	pr_fd = PR_ImportTCPSocket(port->sock);
+	if (!pr_fd)
+		ereport(ERROR,
+				(errmsg("unable to connect to socket")));
+
+	/*
+	 * Most of the documentation available, and implementations of, NSS/NSPR
+	 * use the PR_NewTCPSocket() function here, which has the drawback that it
+	 * can only create IPv4 sockets. Instead use PR_OpenTCPSocket() which
+	 * copes with IPv6 as well.
+	 *
+	 * We use a model filedescriptor here which is a construct in NSPR/NSS in
+	 * order to create a configuration template for sockets which can then be
+	 * applied to new sockets created. This makes more sense in a server which
+	 * accepts multiple connections and want to perform the boilerplate just
+	 * once, but it does provide a nice abstraction here as well in that we
+	 * can error out early without having performed any operation on the real
+	 * socket.
+	 */
+	model = PR_OpenTCPSocket(port->laddr.addr.ss_family);
+	if (!model)
+		ereport(ERROR,
+				(errmsg("unable to open socket")));
+
+	/*
+	 * Convert the NSPR socket to an SSL socket. Ensuring the success of this
+	 * operation is critical as NSS SSL_* functions may return SECSuccess on
+	 * the socket even though SSL hasn't been enabled, which introduce a risk
+	 * of silent downgrades.
+	 */
+	model = SSL_ImportFD(NULL, model);
+	if (!model)
+		ereport(ERROR,
+				(errmsg("unable to enable TLS on socket")));
+
+	/*
+	 * Configure basic settings for the connection over the SSL socket in
+	 * order to set it up as a server.
+	 */
+	if (SSL_OptionSet(model, SSL_SECURITY, PR_TRUE) != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to configure TLS connection")));
+
+	if (SSL_OptionSet(model, SSL_HANDSHAKE_AS_SERVER, PR_TRUE) != SECSuccess ||
+		SSL_OptionSet(model, SSL_HANDSHAKE_AS_CLIENT, PR_FALSE) != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to configure TLS connection as server")));
+
+	/*
+	 * SSLv2 is disabled by default, and SSLv3 will be excluded from the range
+	 * of allowed protocols further down. Since we really don't want these to
+	 * ever be enabled, let's use belts and suspenders and explicitly turn
+	 * them off as well.
+	 */
+	SSL_OptionSet(model, SSL_ENABLE_SSL2, PR_FALSE);
+	SSL_OptionSet(model, SSL_ENABLE_SSL3, PR_FALSE);
+
+#ifdef SSL_CBC_RANDOM_IV
+
+	/*
+	 * Enable protection against the BEAST attack in case the NSS server has
+	 * support for that. While SSLv3 is disabled, we may still allow TLSv1
+	 * which is affected. The option isn't documented as an SSL option, but as
+	 * an NSS environment variable.
+	 */
+	SSL_OptionSet(model, SSL_CBC_RANDOM_IV, PR_TRUE);
+#endif
+
+	/*
+	 * Configure the allowed ciphers. If there are no user preferred suites,
+	 * set the domestic policy.
+	 *
+	 * Historically there were different cipher policies based on export (and
+	 * import) restrictions: Domestic, Export and France. These are since long
+	 * removed with all ciphers being enabled by default. Due to backwards
+	 * compatibility, the old API is still used even though all three policies
+	 * now do the same thing.
+	 *
+	 * If SSLCipherSuites define a policy of the user, we set that rather than
+	 * enabling all ciphers via NSS_SetDomesticPolicy.
+	 *
+	 * TODO: while this code works, the set of ciphers which can be set and
+	 * still end up with a working socket is woefully underdocumented for
+	 * anything more recent than SSLv3 (the code for TLS actually calls ssl3
+	 * functions under the hood for SSL_CipherPrefSet), so it's unclear if
+	 * this is helpful or not. Using the policies works, but may be too
+	 * coarsely grained.
+	 *
+	 * Another TODO: The SSL_ImplementedCiphers table returned with calling
+	 * SSL_GetImplementedCiphers is sorted in server preference order. Sorting
+	 * SSLCipherSuites according to the order of the ciphers therein could be
+	 * a way to implement ssl_prefer_server_ciphers - if we at all want to use
+	 * cipher selection for NSS like how we do it for OpenSSL that is.
+	 */
+
+	/*
+	 * If no ciphers are specified, enable them all.
+	 */
+	if (!SSLCipherSuites || strlen(SSLCipherSuites) == 0)
+	{
+		status = NSS_SetDomesticPolicy();
+		if (status != SECSuccess)
+			ereport(ERROR,
+					(errmsg("unable to set cipher policy: %s",
+							pg_SSLerrmessage(PR_GetError()))));
+	}
+	else
+	{
+		char	   *ciphers,
+				   *c;
+
+		char	   *sep = ":;, ";
+		PRUint16	ciphercode;
+		const		PRUint16 *nss_ciphers;
+
+		/*
+		 * If the user has specified a set of preferred cipher suites we start
+		 * by turning off all the existing suites to avoid the risk of down-
+		 * grades to a weaker cipher than expected.
+		 */
+		nss_ciphers = SSL_GetImplementedCiphers();
+		for (int i = 0; i < SSL_GetNumImplementedCiphers(); i++)
+			SSL_CipherPrefSet(model, nss_ciphers[i], PR_FALSE);
+
+		ciphers = pstrdup(SSLCipherSuites);
+
+		for (c = strtok(ciphers, sep); c; c = strtok(NULL, sep))
+		{
+			ciphercode = pg_find_cipher(c);
+			if (ciphercode != INVALID_CIPHER)
+			{
+				status = SSL_CipherPrefSet(model, ciphercode, PR_TRUE);
+				if (status != SECSuccess)
+					ereport(ERROR,
+							(errmsg("invalid cipher-suite specified: %s", c)));
+			}
+		}
+
+		pfree(ciphers);
+	}
+
+	if (SSL_VersionRangeSet(model, &desired_sslver) != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to set requested SSL protocol version range")));
+
+	/*
+	 * Set up the custom IO layer.
+	 */
+	layer = init_iolayer(port);
+	if (!layer)
+		goto error;
+
+	if (PR_PushIOLayer(pr_fd, PR_TOP_IO_LAYER, layer) != PR_SUCCESS)
+	{
+		PR_Close(layer);
+		ereport(ERROR,
+				(errmsg("unable to push IO layer")));
+	}
+
+	server_cert = PK11_FindCertFromNickname(ssl_cert_file, (void *) port);
+	if (!server_cert)
+	{
+		if (dummy_ssl_passwd_cb_called)
+			ereport(ERROR,
+					(errmsg("unable to load certificate for \"%s\": %s",
+							ssl_cert_file, pg_SSLerrmessage(PR_GetError())),
+					 errhint("The certificate requires a password.")));
+		else
+			ereport(ERROR,
+					(errmsg("unable to find certificate for \"%s\": %s",
+							ssl_cert_file, pg_SSLerrmessage(PR_GetError()))));
+	}
+
+	private_key = PK11_FindKeyByAnyCert(server_cert, (void *) port);
+	if (!private_key)
+	{
+		if (dummy_ssl_passwd_cb_called)
+			ereport(ERROR,
+					(errmsg("unable to load private key for \"%s\": %s",
+							ssl_cert_file, pg_SSLerrmessage(PR_GetError())),
+					 errhint("The private key requires a password.")));
+		else
+			ereport(ERROR,
+					(errmsg("unable to find private key for \"%s\": %s",
+							ssl_cert_file, pg_SSLerrmessage(PR_GetError()))));
+	}
+
+	/*
+	 * NSS doesn't use CRL files on disk, so we use the ssl_crl_file guc to
+	 * contain the CRL nickname for the current server certificate in the NSS
+	 * certificate database. The main difference from the OpenSSL backend is
+	 * that NSS will use the CRL regardless, but being able to make sure the
+	 * CRL is loaded seems like a good feature.
+	 */
+	if (ssl_crl_file[0])
+	{
+		SECITEM_CopyItem(NULL, &crlname, &server_cert->derSubject);
+		crl = SEC_FindCrlByName(CERT_GetDefaultCertDB(), &crlname, SEC_CRL_TYPE);
+		if (!crl)
+			ereport(ERROR,
+					(errmsg("specified CRL not found in database")));
+		SEC_DestroyCrl(crl);
+	}
+
+	/*
+	 * Finally we must configure the socket for being a server by setting the
+	 * certificate and key. The NULL parameter is an SSLExtraServerCertData
+	 * pointer with the final parameter being the size of the extra server
+	 * cert data structure pointed to. This is typically only used for
+	 * credential delegation.
+	 */
+	status = SSL_ConfigServerCert(model, server_cert, private_key, NULL, 0);
+	if (status != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to configure server for TLS server connections: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+
+	ssl_loaded_verify_locations = true;
+
+	/*
+	 * At this point, we no longer have use for the certificate and private
+	 * key as they have been copied into the context by NSS. Destroy our
+	 * copies explicitly to clean out the memory as best we can.
+	 */
+	CERT_DestroyCertificate(server_cert);
+	SECKEY_DestroyPrivateKey(private_key);
+
+	status = SSL_AuthCertificateHook(model, pg_cert_auth_handler, (void *) port);
+	if (status != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to install authcert hook: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+	SSL_BadCertHook(model, pg_bad_cert_handler, (void *) port);
+	SSL_OptionSet(model, SSL_REQUEST_CERTIFICATE, PR_TRUE);
+	SSL_OptionSet(model, SSL_REQUIRE_CERTIFICATE, PR_FALSE);
+
+	port->pr_fd = SSL_ImportFD(model, pr_fd);
+	if (!port->pr_fd)
+		ereport(ERROR,
+				(errmsg("unable to initialize")));
+
+	PR_Close(model);
+
+	/*
+	 * Force a handshake on the next I/O request, the second parameter means
+	 * that we are a server, PR_FALSE would indicate being a client. NSPR
+	 * requires us to call SSL_ResetHandshake since we imported an already
+	 * established socket.
+	 */
+	status = SSL_ResetHandshake(port->pr_fd, PR_TRUE);
+	if (status != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to initiate handshake: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+	status = SSL_ForceHandshake(port->pr_fd);
+	if (status != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to handshake: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+
+	port->ssl_in_use = true;
+	return 0;
+
+error:
+	return 1;
+}
+
+ssize_t
+be_tls_read(Port *port, void *ptr, size_t len, int *waitfor)
+{
+	ssize_t		n_read;
+	PRErrorCode err;
+
+	n_read = PR_Read(port->pr_fd, ptr, len);
+
+	if (n_read < 0)
+	{
+		err = PR_GetError();
+
+		if (err == PR_WOULD_BLOCK_ERROR)
+		{
+			*waitfor = WL_SOCKET_READABLE;
+			errno = EWOULDBLOCK;
+		}
+		else
+			errno = ECONNRESET;
+	}
+
+	return n_read;
+}
+
+ssize_t
+be_tls_write(Port *port, void *ptr, size_t len, int *waitfor)
+{
+	ssize_t		n_write;
+	PRErrorCode err;
+	PRIntn		flags = 0;
+
+	/*
+	 * The flags parameter to PR_Send is no longer used and is, according to
+	 * the documentation, required to be zero.
+	 */
+	n_write = PR_Send(port->pr_fd, ptr, len, flags, PR_INTERVAL_NO_WAIT);
+
+	if (n_write < 0)
+	{
+		err = PR_GetError();
+
+		if (err == PR_WOULD_BLOCK_ERROR)
+		{
+			*waitfor = WL_SOCKET_WRITEABLE;
+			errno = EWOULDBLOCK;
+		}
+		else
+			errno = ECONNRESET;
+	}
+
+	return n_write;
+}
+
+void
+be_tls_close(Port *port)
+{
+	if (!port)
+		return;
+
+	if (port->peer_cn)
+	{
+		SSL_InvalidateSession(port->pr_fd);
+		pfree(port->peer_cn);
+		port->peer_cn = NULL;
+	}
+
+	PR_Close(port->pr_fd);
+	port->pr_fd = NULL;
+	port->ssl_in_use = false;
+
+	if (nss_context)
+	{
+		NSS_ShutdownContext(nss_context);
+		nss_context = NULL;
+	}
+}
+
+void
+be_tls_destroy(void)
+{
+	/*
+	 * It reads a bit odd to clear a session cache when we are destroying the
+	 * context altogether, but if the session cache isn't cleared before
+	 * shutting down the context it will fail with SEC_ERROR_BUSY.
+	 */
+	SSL_ClearSessionCache();
+}
+
+int
+be_tls_get_cipher_bits(Port *port)
+{
+	SECStatus	status;
+	SSLChannelInfo channel;
+	SSLCipherSuiteInfo suite;
+
+	status = SSL_GetChannelInfo(port->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+		goto error;
+
+	status = SSL_GetCipherSuiteInfo(channel.cipherSuite, &suite, sizeof(suite));
+	if (status != SECSuccess)
+		goto error;
+
+	return suite.effectiveKeyBits;
+
+error:
+	ereport(WARNING,
+			(errmsg("unable to extract TLS session information: %s",
+					pg_SSLerrmessage(PR_GetError()))));
+	return 0;
+}
+
+/*
+ * be_tls_get_compression
+ *
+ * NSS disabled support for TLS compression in version 3.33 and removed the
+ * code in a subsequent release. The API for retrieving information about
+ * compression as well as enabling it is kept for backwards compatibility, but
+ * we don't need to consult it since it was only available for SSLv3 which we
+ * don't support.
+ *
+ * https://bugzilla.mozilla.org/show_bug.cgi?id=1409587
+ */
+bool
+be_tls_get_compression(Port *port)
+{
+	return false;
+}
+
+/*
+ * be_tls_get_version
+ *
+ * Returns the protocol version used for the current connection, or NULL in
+ * case of errors.
+ */
+const char *
+be_tls_get_version(Port *port)
+{
+	SECStatus	status;
+	SSLChannelInfo channel;
+
+	status = SSL_GetChannelInfo(port->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+	{
+		ereport(WARNING,
+				(errmsg("unable to extract TLS session information: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+		return NULL;
+	}
+
+	return ssl_protocol_version_to_string(channel.protocolVersion);
+}
+
+const char *
+be_tls_get_cipher(Port *port)
+{
+	SECStatus	status;
+	SSLChannelInfo channel;
+	SSLCipherSuiteInfo suite;
+
+	status = SSL_GetChannelInfo(port->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+		goto error;
+
+	status = SSL_GetCipherSuiteInfo(channel.cipherSuite, &suite, sizeof(suite));
+	if (status != SECSuccess)
+		goto error;
+
+	return suite.cipherSuiteName;
+
+error:
+	ereport(WARNING,
+			(errmsg("unable to extract TLS session information: %s",
+					pg_SSLerrmessage(PR_GetError()))));
+	return NULL;
+}
+
+void
+be_tls_get_peer_subject_name(Port *port, char *ptr, size_t len)
+{
+	CERTCertificate *certificate;
+
+	certificate = SSL_PeerCertificate(port->pr_fd);
+	if (certificate)
+		strlcpy(ptr, CERT_NameToAscii(&certificate->subject), len);
+	else
+		ptr[0] = '\0';
+}
+
+void
+be_tls_get_peer_issuer_name(Port *port, char *ptr, size_t len)
+{
+	CERTCertificate *certificate;
+
+	certificate = SSL_PeerCertificate(port->pr_fd);
+	if (certificate)
+		strlcpy(ptr, CERT_NameToAscii(&certificate->issuer), len);
+	else
+		ptr[0] = '\0';
+}
+
+void
+be_tls_get_peer_serial(Port *port, char *ptr, size_t len)
+{
+	CERTCertificate *certificate;
+
+	certificate = SSL_PeerCertificate(port->pr_fd);
+	if (certificate)
+		snprintf(ptr, len, "%li", DER_GetInteger(&(certificate->serialNumber)));
+	else
+		ptr[0] = '\0';
+}
+
+char *
+be_tls_get_certificate_hash(Port *port, size_t *len)
+{
+	CERTCertificate *certificate;
+	SECOidTag	signature_alg;
+	SECOidTag	digest_alg;
+	int			digest_len;
+	SECStatus	status;
+	PLArenaPool *arena = NULL;
+	SECItem		digest;
+	char	   *ret;
+
+	*len = 0;
+	certificate = SSL_LocalCertificate(port->pr_fd);
+	if (!certificate)
+		return NULL;
+
+	signature_alg = SECOID_GetAlgorithmTag(&certificate->signature);
+	/* Set sha-256 as a default */
+	digest_alg = SEC_OID_SHA256;
+	digest_len = SHA256_LENGTH;
+
+	while (NSS_SCRAMDigestAlgorithm->signature)
+	{
+		if (signature_alg == NSS_SCRAMDigestAlgorithm->signature)
+		{
+			digest_alg = NSS_SCRAMDigestAlgorithm->hash;
+			digest_len = NSS_SCRAMDigestAlgorithm->len;
+			break;
+		}
+	}
+
+	arena = PORT_NewArena(SEC_ASN1_DEFAULT_ARENA_SIZE);
+	digest.data = PORT_ArenaZAlloc(arena, sizeof(unsigned char) * digest_len);
+	digest.len = digest_len;
+
+	status = PK11_HashBuf(digest_alg, digest.data,
+						  certificate->derCert.data,
+						  certificate->derCert.len);
+
+	if (status != SECSuccess)
+	{
+		PORT_FreeArena(arena, PR_TRUE);
+		return NULL;
+	}
+
+	ret = palloc(digest.len);
+	memcpy(ret, digest.data, digest.len);
+	*len = digest_len;
+	PORT_FreeArena(arena, PR_TRUE);
+
+	return ret;
+}
+
+/* ------------------------------------------------------------ */
+/*						Internal functions						*/
+/* ------------------------------------------------------------ */
+
+/*
+ * default_nss_tls_init
+ *
+ * The default TLS init hook function which users can override for installing
+ * their own passphrase callbacks and similar actions. In case no callback has
+ * been configured, or the callback isn't reload capable during a server
+ * reload, the dummy callback will be installed.
+ *
+ * The private data for the callback is set differently depending on how it's
+ * invoked. For calls which may invoke the callback deeper in the callstack
+ * the private data is set with SSL_SetPKCS11PinArg. When the call is directly
+ * invoking the callback, like PK11_FindCertFromNickname, then the private
+ * data is passed as a parameter. Setting the data with SSL_SetPKCS11PinArg is
+ * thus not required but good practice.
+ *
+ * NSS doesn't provide a default callback like OpenSSL does, but a callback is
+ * required to be set.  The password callback can be installed at any time, but
+ * setting the private data with SSL_SetPKCS11PinArg requires a PR Filedesc.
+ */
+static void
+default_nss_tls_init(bool isServerStart)
+{
+	/*
+	 * No user-defined callback has been configured, install the dummy call-
+	 * back since we must set something.
+	 */
+	if (!ssl_passphrase_command[0])
+		PK11_SetPasswordFunc(dummy_ssl_passphrase_cb);
+	else
+	{
+		/*
+		 * There is a user-defined callback, set it unless we are in a restart
+		 * and cannot handle restarts due to an interactive callback.
+		 */
+		if (isServerStart)
+			PK11_SetPasswordFunc(external_ssl_passphrase_cb);
+		else
+		{
+			if (ssl_passphrase_command_supports_reload)
+				PK11_SetPasswordFunc(external_ssl_passphrase_cb);
+			else
+				PK11_SetPasswordFunc(dummy_ssl_passphrase_cb);
+		}
+	}
+}
+
+/*
+ * external_ssl_passphrase_cb
+ *
+ * Runs the callback configured by ssl_passphrase_command and returns the
+ * captured password back to NSS.
+ */
+static char *
+external_ssl_passphrase_cb(PK11SlotInfo *slot, PRBool retry, void *arg)
+{
+	/*
+	 * NSS use a hardcoded 256 byte buffer for reading the password so set the
+	 * same limit for our callback buffer.
+	 */
+	char		buf[256];
+	int			len;
+	char	   *password = NULL;
+	char	   *prompt;
+
+	/*
+	 * Since there is no password callback in NSS when the server starts up,
+	 * it makes little sense to create an interactive callback. Thus, if this
+	 * is a retry attempt then give up immediately.
+	 */
+	if (retry)
+		return NULL;
+
+	/*
+	 * Construct the same prompt that NSS uses internally even though it is
+	 * unlikely to serve much purpose, but we must set a prompt so we might as
+	 * well do it right.
+	 */
+	prompt = psprintf("Enter Password or Pin for \"%s\":",
+					  PK11_GetTokenName(slot));
+
+	len = run_ssl_passphrase_command(prompt, ssl_is_server_start, buf, sizeof(buf));
+	pfree(prompt);
+
+	if (!len)
+		return NULL;
+
+	/*
+	 * At least one byte with password content was returned, and NSS requires
+	 * that we return it allocated in NSS controlled memory. If we fail to
+	 * allocate then abort without passing back NULL and bubble up the error
+	 * on the PG side.
+	 */
+	password = (char *) PR_Malloc(len + 1);
+	if (!password)
+	{
+		explicit_bzero(buf, sizeof(buf));
+		ereport(ERROR,
+				(errcode(ERRCODE_OUT_OF_MEMORY),
+				 errmsg("out of memory")));
+	}
+	strlcpy(password, buf, sizeof(password));
+	explicit_bzero(buf, sizeof(buf));
+
+	return password;
+}
+
+/*
+ * dummy_ssl_passphrase_cb
+ *
+ * Return unsuccessful if we are asked to provide the passphrase for a cert or
+ * key, without having a passphrase callback installed.
+ */
+static char *
+dummy_ssl_passphrase_cb(PK11SlotInfo *slot, PRBool retry, void *arg)
+{
+	dummy_ssl_passwd_cb_called = true;
+	return NULL;
+}
+
+static SECStatus
+pg_bad_cert_handler(void *arg, PRFileDesc * fd)
+{
+	Port	   *port = (Port *) arg;
+
+	port->peer_cert_valid = false;
+	return SECFailure;
+}
+
+static SECStatus
+pg_cert_auth_handler(void *arg, PRFileDesc * fd, PRBool checksig, PRBool isServer)
+{
+	SECStatus	status;
+	Port	   *port = (Port *) arg;
+	CERTCertificate *cert;
+	char	   *peer_cn;
+	int			len;
+
+	status = SSL_AuthCertificate(CERT_GetDefaultCertDB(), port->pr_fd, checksig, PR_TRUE);
+	if (status == SECSuccess)
+	{
+		cert = SSL_PeerCertificate(port->pr_fd);
+		len = strlen(cert->subjectName);
+		peer_cn = MemoryContextAllocZero(TopMemoryContext, len + 1);
+
+		/*
+		 * Skip over the key= portion of the key=value containing the the peer
+		 * CN.
+		 */
+		if (strncmp(cert->subjectName, "CN=", 3) == 0)
+			strlcpy(peer_cn, cert->subjectName + strlen("CN="), len + 1);
+		else
+			strlcpy(peer_cn, cert->subjectName, len + 1);
+		CERT_DestroyCertificate(cert);
+
+		port->peer_cn = peer_cn;
+		port->peer_cert_valid = true;
+	}
+
+	return status;
+}
+
+static PRInt32
+pg_ssl_read(PRFileDesc *fd, void *buf, PRInt32 amount, PRIntn flags,
+			PRIntervalTime timeout)
+{
+	PRRecvFN	read_fn;
+	PRInt32		n_read;
+
+	read_fn = fd->lower->methods->recv;
+	n_read = read_fn(fd->lower, buf, amount, flags, timeout);
+
+	return n_read;
+}
+
+static PRInt32
+pg_ssl_write(PRFileDesc *fd, const void *buf, PRInt32 amount, PRIntn flags,
+			 PRIntervalTime timeout)
+{
+	PRSendFN	send_fn;
+	PRInt32		n_write;
+
+	send_fn = fd->lower->methods->send;
+	n_write = send_fn(fd->lower, buf, amount, flags, timeout);
+
+	return n_write;
+}
+
+static PRStatus
+pg_ssl_close(PRFileDesc *fd)
+{
+	/*
+	 * Disconnect our private Port from the fd before closing out the stack.
+	 * (Debug builds of NSPR will assert if we do not.)
+	 */
+	fd->secret = NULL;
+	return PR_GetDefaultIOMethods()->close(fd);
+}
+
+static PRFileDesc *
+init_iolayer(Port *port)
+{
+	const		PRIOMethods *default_methods;
+	PRFileDesc *layer;
+
+	/*
+	 * Start by initializing our layer with all the default methods so that we
+	 * can selectively override the ones we want while still ensuring that we
+	 * have a complete layer specification.
+	 */
+	default_methods = PR_GetDefaultIOMethods();
+	memcpy(&pr_iomethods, default_methods, sizeof(PRIOMethods));
+
+	pr_iomethods.recv = pg_ssl_read;
+	pr_iomethods.send = pg_ssl_write;
+	pr_iomethods.close = pg_ssl_close;
+
+	/*
+	 * Each IO layer must be identified by a unique name, where uniqueness is
+	 * per connection. Each connection in a postgres cluster can generate the
+	 * identity from the same string as they will create their IO layers on
+	 * different sockets. Only one layer per socket can have the same name.
+	 */
+	pr_id = PR_GetUniqueIdentity("PostgreSQL Server");
+	if (pr_id == PR_INVALID_IO_LAYER)
+	{
+		ereport(ERROR,
+				(errmsg("out of memory when setting up TLS connection")));
+		return NULL;
+	}
+
+	/*
+	 * Create the actual IO layer as a stub such that it can be pushed onto
+	 * the layer stack. The step via a stub is required as we define custom
+	 * callbacks.
+	 */
+	layer = PR_CreateIOLayerStub(pr_id, &pr_iomethods);
+	if (!layer)
+	{
+		ereport(ERROR,
+				(errmsg("unable to create NSS I/O layer")));
+		return NULL;
+	}
+
+	/* Store the Port as private data available in callbacks */
+	layer->secret = (void *) port;
+
+	return layer;
+}
+
+static char *
+ssl_protocol_version_to_string(int v)
+{
+	switch (v)
+	{
+			/* SSL v2 and v3 are not supported */
+		case SSL_LIBRARY_VERSION_2:
+		case SSL_LIBRARY_VERSION_3_0:
+			Assert(false);
+			break;
+
+		case SSL_LIBRARY_VERSION_TLS_1_0:
+			return pstrdup("TLSv1.0");
+		case SSL_LIBRARY_VERSION_TLS_1_1:
+			return pstrdup("TLSv1.1");
+		case SSL_LIBRARY_VERSION_TLS_1_2:
+			return pstrdup("TLSv1.2");
+		case SSL_LIBRARY_VERSION_TLS_1_3:
+			return pstrdup("TLSv1.3");
+	}
+
+	return pstrdup("unknown");
+}
+
+
+/*
+ * ssl_protocol_version_to_nss
+ *			Translate PostgreSQL TLS version to NSS version
+ *
+ * Returns zero in case the requested TLS version is undefined (PG_ANY) and
+ * should be set by the caller, or -1 on failure.
+ */
+static uint16
+ssl_protocol_version_to_nss(int v, const char *guc_name)
+{
+	switch (v)
+	{
+			/*
+			 * There is no SSL_LIBRARY_ macro defined in NSS with the value
+			 * zero, so we use this to signal the caller that the highest
+			 * useful version should be set on the connection.
+			 */
+		case PG_TLS_ANY:
+			return 0;
+
+			/*
+			 * No guard is required here as there are no versions of NSS
+			 * without support for TLS1.
+			 */
+		case PG_TLS1_VERSION:
+			return SSL_LIBRARY_VERSION_TLS_1_0;
+		case PG_TLS1_1_VERSION:
+#ifdef SSL_LIBRARY_VERSION_TLS_1_1
+			return SSL_LIBRARY_VERSION_TLS_1_1;
+#else
+			break;
+#endif
+		case PG_TLS1_2_VERSION:
+#ifdef SSL_LIBRARY_VERSION_TLS_1_2
+			return SSL_LIBRARY_VERSION_TLS_1_2;
+#else
+			break;
+#endif
+		case PG_TLS1_3_VERSION:
+#ifdef SSL_LIBRARY_VERSION_TLS_1_3
+			return SSL_LIBRARY_VERSION_TLS_1_3;
+#else
+			break;
+#endif
+		default:
+			break;
+	}
+
+	return -1;
+}
+
+/*
+ * pg_SSLerrmessage
+ *		Create and return a human readable error message given
+ *		the specified error code
+ *
+ * PR_ErrorToName only converts the enum identifier of the error to string,
+ * but that can be quite useful for debugging (and in case PR_ErrorToString is
+ * unable to render a message then we at least have something).
+ */
+static char *
+pg_SSLerrmessage(PRErrorCode errcode)
+{
+	return psprintf("%s (%s)",
+					PR_ErrorToString(errcode, PR_LANGUAGE_I_DEFAULT),
+					PR_ErrorToName(errcode));
+}
diff --git a/src/backend/libpq/be-secure.c b/src/backend/libpq/be-secure.c
index 2ae507a902..f39977b80c 100644
--- a/src/backend/libpq/be-secure.c
+++ b/src/backend/libpq/be-secure.c
@@ -49,6 +49,9 @@ bool		ssl_passphrase_command_supports_reload;
 #ifdef USE_SSL
 bool		ssl_loaded_verify_locations = false;
 #endif
+#ifdef USE_NSS
+char	   *ssl_database;
+#endif
 
 /* GUC variable controlling SSL cipher list */
 char	   *SSLCipherSuites = NULL;
diff --git a/src/backend/libpq/hba.c b/src/backend/libpq/hba.c
index 3a78d2043e..eb1b028464 100644
--- a/src/backend/libpq/hba.c
+++ b/src/backend/libpq/hba.c
@@ -1040,7 +1040,7 @@ parse_hba_line(TokenizedLine *tok_line, int elevel)
 			ereport(elevel,
 					(errcode(ERRCODE_CONFIG_FILE_ERROR),
 					 errmsg("hostssl record cannot match because SSL is not supported by this build"),
-					 errhint("Compile with --with-openssl to use SSL connections."),
+					 errhint("Compile with --with-openssl or --with-nss to use SSL connections."),
 					 errcontext("line %d of configuration file \"%s\"",
 								line_num, HbaFileName)));
 			*err_msg = "hostssl record cannot match because SSL is not supported by this build";
diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c
index bb34630e8e..a1a36cb5e2 100644
--- a/src/backend/utils/misc/guc.c
+++ b/src/backend/utils/misc/guc.c
@@ -4262,7 +4262,11 @@ static struct config_string ConfigureNamesString[] =
 		},
 		&ssl_library,
 #ifdef USE_SSL
+#if defined(USE_OPENSSL)
 		"OpenSSL",
+#elif defined(USE_NSS)
+		"NSS",
+#endif
 #else
 		"",
 #endif
@@ -4320,6 +4324,18 @@ static struct config_string ConfigureNamesString[] =
 		check_canonical_path, assign_pgstat_temp_directory, NULL
 	},
 
+#ifdef USE_NSS
+	{
+		{"ssl_database", PGC_SIGHUP, CONN_AUTH_SSL,
+			gettext_noop("Location of the NSS certificate database."),
+			NULL
+		},
+		&ssl_database,
+		"",
+		NULL, NULL, NULL
+	},
+#endif
+
 	{
 		{"synchronous_standby_names", PGC_SIGHUP, REPLICATION_PRIMARY,
 			gettext_noop("Number of synchronous standbys and list of names of potential synchronous ones."),
@@ -4348,8 +4364,10 @@ static struct config_string ConfigureNamesString[] =
 			GUC_SUPERUSER_ONLY
 		},
 		&SSLCipherSuites,
-#ifdef USE_OPENSSL
+#if defined(USE_OPENSSL)
 		"HIGH:MEDIUM:+3DES:!aNULL",
+#elif defined (USE_NSS)
+		"",
 #else
 		"none",
 #endif
diff --git a/src/common/Makefile b/src/common/Makefile
index 25c55bd642..614f93af09 100644
--- a/src/common/Makefile
+++ b/src/common/Makefile
@@ -79,7 +79,7 @@ OBJS_COMMON = \
 	wait_error.o \
 	wchar.o
 
-ifeq ($(with_openssl),yes)
+ifeq ($(with_ssl),openssl)
 OBJS_COMMON += \
 	protocol_openssl.o \
 	sha2_openssl.o
diff --git a/src/include/common/pg_nss.h b/src/include/common/pg_nss.h
new file mode 100644
index 0000000000..008fee85f1
--- /dev/null
+++ b/src/include/common/pg_nss.h
@@ -0,0 +1,175 @@
+/*-------------------------------------------------------------------------
+ *
+ * pg_nss.h
+ *	  Support for NSS as a TLS backend
+ *
+ * These definitions are used by both frontend and backend code.
+ *
+ * Copyright (c) 2020, PostgreSQL Global Development Group
+ *
+ * IDENTIFICATION
+ *        src/include/common/pg_nss.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef PG_NSS_H
+#define PG_NSS_H
+
+#ifdef USE_NSS
+#define NO_NSPR_10_SUPPORT
+#include <nss/hasht.h>
+#include <nss/secoidt.h>
+#include <nss/sslproto.h>
+
+PRUint16	pg_find_cipher(char *name);
+
+typedef struct
+{
+	SECOidTag	signature;
+	SECOidTag	hash;
+	int			len;
+}			NSSSignatureAlgorithms;
+
+typedef struct
+{
+	const char *name;
+	PRUint16	number;
+}			NSSCiphers;
+
+#define INVALID_CIPHER	0xFFFF
+
+static const NSSSignatureAlgorithms NSS_SCRAMDigestAlgorithm[] = {
+
+	{SEC_OID_PKCS1_MD5_WITH_RSA_ENCRYPTION, SEC_OID_SHA256, SHA256_LENGTH},
+	{SEC_OID_PKCS1_SHA1_WITH_RSA_ENCRYPTION, SEC_OID_SHA256, SHA256_LENGTH},
+	{SEC_OID_ISO_SHA_WITH_RSA_SIGNATURE, SEC_OID_SHA256, SHA256_LENGTH},
+	{SEC_OID_ISO_SHA1_WITH_RSA_SIGNATURE, SEC_OID_SHA256, SHA256_LENGTH},
+	{SEC_OID_PKCS5_PBE_WITH_MD5_AND_DES_CBC, SEC_OID_SHA256, SHA256_LENGTH},
+
+	{SEC_OID_ANSIX962_ECDSA_SHA224_SIGNATURE, SEC_OID_SHA224, SHA224_LENGTH},
+	{SEC_OID_PKCS1_SHA224_WITH_RSA_ENCRYPTION, SEC_OID_SHA224, SHA224_LENGTH},
+	{SEC_OID_NIST_DSA_SIGNATURE_WITH_SHA224_DIGEST, SEC_OID_SHA224, SHA224_LENGTH},
+
+	{SEC_OID_ANSIX962_ECDSA_SHA256_SIGNATURE, SEC_OID_SHA256, SHA256_LENGTH},
+	{SEC_OID_PKCS1_SHA256_WITH_RSA_ENCRYPTION, SEC_OID_SHA256, SHA256_LENGTH},
+	{SEC_OID_NIST_DSA_SIGNATURE_WITH_SHA256_DIGEST, SEC_OID_SHA256, SHA256_LENGTH},
+
+	{SEC_OID_ANSIX962_ECDSA_SHA384_SIGNATURE, SEC_OID_SHA384, SHA384_LENGTH},
+	{SEC_OID_PKCS1_SHA384_WITH_RSA_ENCRYPTION, SEC_OID_SHA384, SHA384_LENGTH},
+
+	{SEC_OID_ANSIX962_ECDSA_SHA512_SIGNATURE, SEC_OID_SHA512, SHA512_LENGTH},
+	{SEC_OID_PKCS1_SHA512_WITH_RSA_ENCRYPTION, SEC_OID_SHA512, SHA512_LENGTH},
+
+	{0, 0}
+};
+
+/*
+ * This list is a partial copy of the ciphers in NSS files lib/ssl/sslproto.h
+ * in order to provide a human readable version of the ciphers. It would be
+ * nice to not have to have this, but NSS doesn't provide any API addressing
+ * the ciphers by name. TODO: do we want more of the ciphers, or perhaps less?
+ */
+static const NSSCiphers NSS_CipherList[] = {
+
+	{"TLS_NULL_WITH_NULL_NULL", TLS_NULL_WITH_NULL_NULL},
+
+	{"TLS_RSA_WITH_NULL_MD5", TLS_RSA_WITH_NULL_MD5},
+	{"TLS_RSA_WITH_NULL_SHA", TLS_RSA_WITH_NULL_SHA},
+	{"TLS_RSA_WITH_RC4_128_MD5", TLS_RSA_WITH_RC4_128_MD5},
+	{"TLS_RSA_WITH_RC4_128_SHA", TLS_RSA_WITH_RC4_128_SHA},
+	{"TLS_RSA_WITH_IDEA_CBC_SHA", TLS_RSA_WITH_IDEA_CBC_SHA},
+	{"TLS_RSA_WITH_DES_CBC_SHA", TLS_RSA_WITH_DES_CBC_SHA},
+	{"TLS_RSA_WITH_3DES_EDE_CBC_SHA", TLS_RSA_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_DH_DSS_WITH_DES_CBC_SHA", TLS_DH_DSS_WITH_DES_CBC_SHA},
+	{"TLS_DH_DSS_WITH_3DES_EDE_CBC_SHA", TLS_DH_DSS_WITH_3DES_EDE_CBC_SHA},
+	{"TLS_DH_RSA_WITH_DES_CBC_SHA", TLS_DH_RSA_WITH_DES_CBC_SHA},
+	{"TLS_DH_RSA_WITH_3DES_EDE_CBC_SHA", TLS_DH_RSA_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_DHE_DSS_WITH_DES_CBC_SHA", TLS_DHE_DSS_WITH_DES_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_3DES_EDE_CBC_SHA", TLS_DHE_DSS_WITH_3DES_EDE_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_DES_CBC_SHA", TLS_DHE_RSA_WITH_DES_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA", TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_DH_anon_WITH_RC4_128_MD5", TLS_DH_anon_WITH_RC4_128_MD5},
+	{"TLS_DH_anon_WITH_DES_CBC_SHA", TLS_DH_anon_WITH_DES_CBC_SHA},
+	{"TLS_DH_anon_WITH_3DES_EDE_CBC_SHA", TLS_DH_anon_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_RSA_WITH_AES_128_CBC_SHA", TLS_RSA_WITH_AES_128_CBC_SHA},
+	{"TLS_DH_DSS_WITH_AES_128_CBC_SHA", TLS_DH_DSS_WITH_AES_128_CBC_SHA},
+	{"TLS_DH_RSA_WITH_AES_128_CBC_SHA", TLS_DH_RSA_WITH_AES_128_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_AES_128_CBC_SHA", TLS_DHE_DSS_WITH_AES_128_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_AES_128_CBC_SHA", TLS_DHE_RSA_WITH_AES_128_CBC_SHA},
+	{"TLS_DH_anon_WITH_AES_128_CBC_SHA", TLS_DH_anon_WITH_AES_128_CBC_SHA},
+
+	{"TLS_RSA_WITH_AES_256_CBC_SHA", TLS_RSA_WITH_AES_256_CBC_SHA},
+	{"TLS_DH_DSS_WITH_AES_256_CBC_SHA", TLS_DH_DSS_WITH_AES_256_CBC_SHA},
+	{"TLS_DH_RSA_WITH_AES_256_CBC_SHA", TLS_DH_RSA_WITH_AES_256_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_AES_256_CBC_SHA", TLS_DHE_DSS_WITH_AES_256_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_AES_256_CBC_SHA", TLS_DHE_RSA_WITH_AES_256_CBC_SHA},
+	{"TLS_DH_anon_WITH_AES_256_CBC_SHA", TLS_DH_anon_WITH_AES_256_CBC_SHA},
+	{"TLS_RSA_WITH_NULL_SHA256", TLS_RSA_WITH_NULL_SHA256},
+	{"TLS_RSA_WITH_AES_128_CBC_SHA256", TLS_RSA_WITH_AES_128_CBC_SHA256},
+	{"TLS_RSA_WITH_AES_256_CBC_SHA256", TLS_RSA_WITH_AES_256_CBC_SHA256},
+
+	{"TLS_DHE_DSS_WITH_AES_128_CBC_SHA256", TLS_DHE_DSS_WITH_AES_128_CBC_SHA256},
+	{"TLS_RSA_WITH_CAMELLIA_128_CBC_SHA", TLS_RSA_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DH_DSS_WITH_CAMELLIA_128_CBC_SHA", TLS_DH_DSS_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DH_RSA_WITH_CAMELLIA_128_CBC_SHA", TLS_DH_RSA_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_CAMELLIA_128_CBC_SHA", TLS_DHE_DSS_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA", TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DH_anon_WITH_CAMELLIA_128_CBC_SHA", TLS_DH_anon_WITH_CAMELLIA_128_CBC_SHA},
+
+	{"TLS_DHE_DSS_WITH_RC4_128_SHA", TLS_DHE_DSS_WITH_RC4_128_SHA},
+	{"TLS_DHE_RSA_WITH_AES_128_CBC_SHA256", TLS_DHE_RSA_WITH_AES_128_CBC_SHA256},
+	{"TLS_DHE_DSS_WITH_AES_256_CBC_SHA256", TLS_DHE_DSS_WITH_AES_256_CBC_SHA256},
+	{"TLS_DHE_RSA_WITH_AES_256_CBC_SHA256", TLS_DHE_RSA_WITH_AES_256_CBC_SHA256},
+
+	{"TLS_RSA_WITH_CAMELLIA_256_CBC_SHA", TLS_RSA_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DH_DSS_WITH_CAMELLIA_256_CBC_SHA", TLS_DH_DSS_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DH_RSA_WITH_CAMELLIA_256_CBC_SHA", TLS_DH_RSA_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_CAMELLIA_256_CBC_SHA", TLS_DHE_DSS_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA", TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DH_anon_WITH_CAMELLIA_256_CBC_SHA", TLS_DH_anon_WITH_CAMELLIA_256_CBC_SHA},
+
+	{"TLS_RSA_WITH_SEED_CBC_SHA", TLS_RSA_WITH_SEED_CBC_SHA},
+
+	{"TLS_RSA_WITH_AES_128_GCM_SHA256", TLS_RSA_WITH_AES_128_GCM_SHA256},
+	{"TLS_RSA_WITH_AES_256_GCM_SHA384", TLS_RSA_WITH_AES_256_GCM_SHA384},
+	{"TLS_DHE_RSA_WITH_AES_128_GCM_SHA256", TLS_DHE_RSA_WITH_AES_128_GCM_SHA256},
+	{"TLS_DHE_RSA_WITH_AES_256_GCM_SHA384", TLS_DHE_RSA_WITH_AES_256_GCM_SHA384},
+	{"TLS_DHE_DSS_WITH_AES_128_GCM_SHA256", TLS_DHE_DSS_WITH_AES_128_GCM_SHA256},
+	{"TLS_DHE_DSS_WITH_AES_256_GCM_SHA384", TLS_DHE_DSS_WITH_AES_256_GCM_SHA384},
+
+	{"TLS_AES_128_GCM_SHA256", TLS_AES_128_GCM_SHA256},
+	{"TLS_AES_256_GCM_SHA384", TLS_AES_256_GCM_SHA384},
+	{"TLS_CHACHA20_POLY1305_SHA256", TLS_CHACHA20_POLY1305_SHA256},
+	{NULL, 0}
+};
+
+/*
+ * pg_find_cipher
+ *			Translate an NSS ciphername to the cipher code
+ *
+ * Searches the configured ciphers for the corresponding cipher code to the
+ * name. Search is performed case insensitive.
+ */
+PRUint16
+pg_find_cipher(char *name)
+{
+	const		NSSCiphers *cipher_list = NSS_CipherList;
+
+	while (cipher_list->name)
+	{
+		if (pg_strcasecmp(cipher_list->name, name) == 0)
+			return cipher_list->number;
+
+		cipher_list++;
+	}
+
+	return 0xFFFF;
+}
+
+#endif							/* USE_NSS */
+
+#endif							/* PG_NSS_H */
diff --git a/src/include/libpq/libpq-be.h b/src/include/libpq/libpq-be.h
index 0a23281ad5..74f88b628e 100644
--- a/src/include/libpq/libpq-be.h
+++ b/src/include/libpq/libpq-be.h
@@ -192,13 +192,18 @@ typedef struct Port
 	bool		peer_cert_valid;
 
 	/*
-	 * OpenSSL structures. (Keep these last so that the locations of other
-	 * fields are the same whether or not you build with OpenSSL.)
+	 * SSL backend specific structures. (Keep these last so that the locations
+	 * of other fields are the same whether or not you build with SSL
+	 * enabled.)
 	 */
 #ifdef USE_OPENSSL
 	SSL		   *ssl;
 	X509	   *peer;
 #endif
+
+#ifdef USE_NSS
+	void	   *pr_fd;
+#endif
 } Port;
 
 #ifdef USE_SSL
@@ -282,7 +287,7 @@ extern void be_tls_get_peer_serial(Port *port, char *ptr, size_t len);
  * This is not supported with old versions of OpenSSL that don't have
  * the X509_get_signature_nid() function.
  */
-#if defined(USE_OPENSSL) && defined(HAVE_X509_GET_SIGNATURE_NID)
+#if defined(USE_NSS) || (defined(USE_OPENSSL) && defined(HAVE_X509_GET_SIGNATURE_NID))
 #define HAVE_BE_TLS_GET_CERTIFICATE_HASH
 extern char *be_tls_get_certificate_hash(Port *port, size_t *len);
 #endif
@@ -292,6 +297,10 @@ extern char *be_tls_get_certificate_hash(Port *port, size_t *len);
 typedef void (*openssl_tls_init_hook_typ) (SSL_CTX *context, bool isServerStart);
 extern PGDLLIMPORT openssl_tls_init_hook_typ openssl_tls_init_hook;
 #endif
+#ifdef USE_NSS
+typedef void (*nss_tls_init_hook_type) (bool isServerStart);
+extern PGDLLIMPORT nss_tls_init_hook_type nss_tls_init_hook;
+#endif
 
 #endif							/* USE_SSL */
 
diff --git a/src/include/libpq/libpq.h b/src/include/libpq/libpq.h
index b1152475ac..298d87ecae 100644
--- a/src/include/libpq/libpq.h
+++ b/src/include/libpq/libpq.h
@@ -88,6 +88,9 @@ extern PGDLLIMPORT bool ssl_passphrase_command_supports_reload;
 #ifdef USE_SSL
 extern bool ssl_loaded_verify_locations;
 #endif
+#ifdef USE_NSS
+extern char *ssl_database;
+#endif
 
 extern int	secure_initialize(bool isServerStart);
 extern bool secure_loaded_verify_locations(void);
diff --git a/src/include/pg_config.h.in b/src/include/pg_config.h.in
index fb270df678..31f808398c 100644
--- a/src/include/pg_config.h.in
+++ b/src/include/pg_config.h.in
@@ -893,6 +893,9 @@
 /* Define to 1 to build with PAM support. (--with-pam) */
 #undef USE_PAM
 
+/* Define to build with NSS support (--with-nss) */
+#undef USE_NSS
+
 /* Define to 1 to use software CRC-32C implementation (slicing-by-8). */
 #undef USE_SLICING_BY_8_CRC32C
 
diff --git a/src/include/pg_config_manual.h b/src/include/pg_config_manual.h
index 705dc69c06..c28b84126d 100644
--- a/src/include/pg_config_manual.h
+++ b/src/include/pg_config_manual.h
@@ -176,10 +176,9 @@
 
 /*
  * USE_SSL code should be compiled only when compiling with an SSL
- * implementation.  (Currently, only OpenSSL is supported, but we might add
- * more implementations in the future.)
+ * implementation.
  */
-#ifdef USE_OPENSSL
+#if defined(USE_OPENSSL) || defined(USE_NSS)
 #define USE_SSL
 #endif
 
diff --git a/src/interfaces/libpq/Makefile b/src/interfaces/libpq/Makefile
index 4ac5f4b340..e902f38c8e 100644
--- a/src/interfaces/libpq/Makefile
+++ b/src/interfaces/libpq/Makefile
@@ -45,12 +45,21 @@ OBJS = \
 	pqexpbuffer.o \
 	fe-auth.o
 
-ifeq ($(with_openssl),yes)
+ifneq ($(with_ssl),no)
+OBJS += \
+	fe-secure-common.o
+endif
+
+ifeq ($(with_ssl),openssl)
 OBJS += \
-	fe-secure-common.o \
 	fe-secure-openssl.o
 endif
 
+ifeq ($(with_ssl), nss)
+OBJS += \
+	fe-secure-nss.o
+endif
+
 ifeq ($(with_gssapi),yes)
 OBJS += \
 	fe-gssapi-common.o \
diff --git a/src/interfaces/libpq/fe-connect.c b/src/interfaces/libpq/fe-connect.c
index e7781d010f..8188401659 100644
--- a/src/interfaces/libpq/fe-connect.c
+++ b/src/interfaces/libpq/fe-connect.c
@@ -355,6 +355,10 @@ static const internalPQconninfoOption PQconninfoOptions[] = {
 		"Target-Session-Attrs", "", 11, /* sizeof("read-write") = 11 */
 	offsetof(struct pg_conn, target_session_attrs)},
 
+	{"cert_database", NULL, NULL, NULL,
+		"CertificateDatabase", "", 64,
+	offsetof(struct pg_conn, cert_database)},
+
 	/* Terminating entry --- MUST BE LAST */
 	{NULL, NULL, NULL, NULL,
 	NULL, NULL, 0}
diff --git a/src/interfaces/libpq/fe-secure-nss.c b/src/interfaces/libpq/fe-secure-nss.c
new file mode 100644
index 0000000000..787bc140a6
--- /dev/null
+++ b/src/interfaces/libpq/fe-secure-nss.c
@@ -0,0 +1,1089 @@
+/*-------------------------------------------------------------------------
+ *
+ * fe-secure-nss.c
+ *	  functions for supporting NSS as a TLS backend for frontend libpq
+ *
+ * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ *	  src/interfaces/libpq/fe-secure-nss.c
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#include "postgres_fe.h"
+
+#include "libpq-fe.h"
+#include "fe-auth.h"
+#include "fe-secure-common.h"
+#include "libpq-int.h"
+#include "common/pg_nss.h"
+
+/*
+ * BITS_PER_BYTE is also defined in the NSPR header files, so we need to undef
+ * our version to avoid compiler warnings on redefinition.
+ */
+#define pg_BITS_PER_BYTE BITS_PER_BYTE
+#undef BITS_PER_BYTE
+
+/*
+ * The nspr/obsolete/protypes.h NSPR header typedefs uint64 and int64 with
+ * colliding definitions from ours, causing a much expected compiler error.
+ * Remove backwards compatibility with ancient NSPR versions to avoid this.
+ */
+#define NO_NSPR_10_SUPPORT
+#include <nspr/nspr.h>
+#include <nspr/prerror.h>
+#include <nspr/prinit.h>
+#include <nspr/prio.h>
+#include <nss/hasht.h>
+#include <nss/nss.h>
+#include <nss/ssl.h>
+#include <nss/sslproto.h>
+#include <nss/pk11func.h>
+#include <nss/secerr.h>
+#include <nss/secoidt.h>
+#include <nss/secmod.h>
+
+/*
+ * Ensure that the colliding definitions match, else throw an error. In case
+ * NSPR remove the definition in a future version (however unlikely that may
+ * be, make sure to put ours back again.
+ */
+#if defined(BITS_PER_BYTE)
+#if BITS_PER_BYTE != pg_BITS_PER_BYTE
+#error "incompatible byte widths between NSPR and PostgreSQL"
+#endif
+#else
+#define BITS_PER_BYTE pg_BITS_PER_BYTE
+#endif
+#undef pg_BITS_PER_BYTE
+
+static SECStatus pg_load_nss_module(SECMODModule * *module, const char *library, const char *name);
+static SECStatus pg_bad_cert_handler(void *arg, PRFileDesc * fd);
+static const char *pg_SSLerrmessage(PRErrorCode errcode);
+static SECStatus pg_client_auth_handler(void *arg, PRFileDesc * socket, CERTDistNames * caNames,
+										CERTCertificate * *pRetCert, SECKEYPrivateKey * *pRetKey);
+static SECStatus pg_cert_auth_handler(void *arg, PRFileDesc * fd, PRBool checksig, PRBool isServer);
+static int	ssl_protocol_version_to_nss(const char *protocol);
+static bool cert_database_has_CA(PGconn *conn);
+
+static char *PQssl_passwd_cb(PK11SlotInfo * slot, PRBool retry, void *arg);
+
+/*
+ * PR_ImportTCPSocket() is a private API, but very widely used, as it's the
+ * only way to make NSS use an already set up POSIX file descriptor rather
+ * than opening one itself. To quote the NSS documentation:
+ *
+ *		"In theory, code that uses PR_ImportTCPSocket may break when NSPR's
+ *		implementation changes. In practice, this is unlikely to happen because
+ *		NSPR's implementation has been stable for years and because of NSPR's
+ *		strong commitment to backward compatibility."
+ *
+ * https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSPR/Reference/PR_ImportTCPSocket
+ *
+ * The function is declared in <private/pprio.h>, but as it is a header marked
+ * private we declare it here rather than including it.
+ */
+NSPR_API(PRFileDesc *) PR_ImportTCPSocket(int);
+
+static SECMODModule * ca_trust = NULL;
+static NSSInitContext * nss_context = NULL;
+
+/*
+ * This logic exist in NSS as well, but it's only available for when there is
+ * a database to open, and not only using the system trust store. Thus, we
+ * need to keep our own copy.
+ */
+#if defined(WIN32)
+static const char *ca_trust_name = "nssckbi.dll";
+#elif defined(__darwin__)
+static const char *ca_trust_name = "libnssckbi.dylib";
+#else
+static const char *ca_trust_name = "libnssckbi.so";
+#endif
+
+static PQsslKeyPassHook_nss_type PQsslKeyPassHook = NULL;
+
+/* ------------------------------------------------------------ */
+/*			 Procedures common to all secure sessions			*/
+/* ------------------------------------------------------------ */
+
+/*
+ * pgtls_init_library
+ *
+ * There is no direct equivalent for PQinitOpenSSL in NSS/NSPR, with PR_Init
+ * being the closest match there is. PR_Init is however already documented to
+ * not be required so simply making this a noop seems like the best option.
+ */
+void
+pgtls_init_library(bool do_ssl, int do_crypto)
+{
+	/* noop */
+}
+
+int
+pgtls_init(PGconn *conn)
+{
+	conn->ssl_in_use = false;
+	conn->has_password = false;
+
+	return 0;
+}
+
+void
+pgtls_close(PGconn *conn)
+{
+	if (nss_context)
+	{
+		NSS_ShutdownContext(nss_context);
+		nss_context = NULL;
+	}
+}
+
+PostgresPollingStatusType
+pgtls_open_client(PGconn *conn)
+{
+	SECStatus	status;
+	PRFileDesc *pr_fd;
+	PRFileDesc *model;
+	NSSInitParameters params;
+	SSLVersionRange desired_range;
+
+	/*
+	 * The NSPR documentation states that runtime initialization via PR_Init
+	 * is no longer required, as the first caller into NSPR will perform the
+	 * initialization implicitly. See be-secure-nss.c for further discussion
+	 * on PR_Init.
+	 */
+	PR_Init(PR_USER_THREAD, PR_PRIORITY_NORMAL, 0);
+
+	/*
+	 * NSS initialization and the use of contexts is further discussed in
+	 * be-secure-nss.c
+	 */
+	memset(&params, 0, sizeof(params));
+	params.length = sizeof(params);
+
+	if (conn->cert_database && strlen(conn->cert_database) > 0)
+	{
+		char	   *cert_database_path = psprintf("sql:%s", conn->cert_database);
+
+		nss_context = NSS_InitContext(cert_database_path, "", "", "",
+									  &params,
+									  NSS_INIT_READONLY | NSS_INIT_PK11RELOAD);
+		pfree(cert_database_path);
+
+		if (!nss_context)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("unable to open certificate database \"%s\": %s"),
+							  conn->cert_database,
+							  pg_SSLerrmessage(PR_GetError()));
+			return PGRES_POLLING_FAILED;
+		}
+	}
+	else
+	{
+		nss_context = NSS_InitContext("", "", "", "", &params,
+									  NSS_INIT_READONLY | NSS_INIT_NOCERTDB |
+									  NSS_INIT_NOMODDB | NSS_INIT_FORCEOPEN |
+									  NSS_INIT_NOROOTINIT | NSS_INIT_PK11RELOAD);
+		if (!nss_context)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("unable to create certificate database: %s"),
+							  pg_SSLerrmessage(PR_GetError()));
+			return PGRES_POLLING_FAILED;
+		}
+	}
+
+	/*
+	 * Configure cipher policy.
+	 */
+	status = NSS_SetDomesticPolicy();
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to configure cipher policy: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * If we don't have a certificate database, the system trust store is the
+	 * fallback we can use. If we fail to initialize that as well, we can
+	 * still attempt a connection as long as the sslmode isn't verify*.
+	 */
+	if (!conn->cert_database && conn->sslmode[0] == 'v')
+	{
+		status = pg_load_nss_module(&ca_trust, ca_trust_name, "\"Root Certificates\"");
+		if (status != SECSuccess)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("WARNING: unable to load NSS trust module \"%s\" : %s"),
+							  ca_trust_name,
+							  pg_SSLerrmessage(PR_GetError()));
+
+			return PGRES_POLLING_FAILED;
+		}
+	}
+
+
+	PK11_SetPasswordFunc(PQssl_passwd_cb);
+
+	/*
+	 * Import the already opened socket as we don't want to use NSPR functions
+	 * for opening the network socket due to how the PostgreSQL protocol works
+	 * with TLS connections. This function is not part of the NSPR public API,
+	 * see the comment at the top of the file for the rationale of still using
+	 * it.
+	 */
+	pr_fd = PR_ImportTCPSocket(conn->sock);
+	if (!pr_fd)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to attach to socket: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * Most of the documentation available, and implementations of, NSS/NSPR
+	 * use the PR_NewTCPSocket() function here, which has the drawback that it
+	 * can only create IPv4 sockets. Instead use PR_OpenTCPSocket() which
+	 * copes with IPv6 as well.
+	 */
+	model = SSL_ImportFD(NULL, PR_OpenTCPSocket(conn->laddr.addr.ss_family));
+	if (!model)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to enable TLS: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/* Disable old protocol versions (SSLv2 and SSLv3) */
+	SSL_OptionSet(model, SSL_ENABLE_SSL2, PR_FALSE);
+	SSL_OptionSet(model, SSL_V2_COMPATIBLE_HELLO, PR_FALSE);
+	SSL_OptionSet(model, SSL_ENABLE_SSL3, PR_FALSE);
+
+#ifdef SSL_CBC_RANDOM_IV
+
+	/*
+	 * Enable protection against the BEAST attack in case the NSS library has
+	 * support for that. While SSLv3 is disabled, we may still allow TLSv1
+	 * which is affected. The option isn't documented as an SSL option, but as
+	 * an NSS environment variable.
+	 */
+	SSL_OptionSet(model, SSL_CBC_RANDOM_IV, PR_TRUE);
+#endif
+
+	/* Set us up as a TLS client for the handshake */
+	SSL_OptionSet(model, SSL_HANDSHAKE_AS_CLIENT, PR_TRUE);
+
+	/*
+	 * When setting the available protocols, we either use the user defined
+	 * configuration values, and if missing we accept whatever is the highest
+	 * version supported by the library as the max and only limit the range in
+	 * the other end at TLSv1.0. ssl_variant_stream is a ProtocolVariant enum
+	 * for Stream protocols, rather than datagram.
+	 */
+	SSL_VersionRangeGetSupported(ssl_variant_stream, &desired_range);
+	desired_range.min = SSL_LIBRARY_VERSION_TLS_1_0;
+
+	if (conn->ssl_min_protocol_version && strlen(conn->ssl_min_protocol_version) > 0)
+	{
+		int			ssl_min_ver = ssl_protocol_version_to_nss(conn->ssl_min_protocol_version);
+
+		if (ssl_min_ver == -1)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("invalid value \"%s\" for minimum version of SSL protocol\n"),
+							  conn->ssl_min_protocol_version);
+			return -1;
+		}
+
+		desired_range.min = ssl_min_ver;
+	}
+
+	if (conn->ssl_max_protocol_version && strlen(conn->ssl_max_protocol_version) > 0)
+	{
+		int			ssl_max_ver = ssl_protocol_version_to_nss(conn->ssl_max_protocol_version);
+
+		if (ssl_max_ver == -1)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("invalid value \"%s\" for maximum version of SSL protocol\n"),
+							  conn->ssl_max_protocol_version);
+			return -1;
+		}
+
+		desired_range.max = ssl_max_ver;
+	}
+
+	if (SSL_VersionRangeSet(model, &desired_range) != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to set allowed SSL protocol version range: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * Set up callback for verifying server certificates, as well as for how
+	 * to handle failed verifications.
+	 */
+	SSL_AuthCertificateHook(model, pg_cert_auth_handler, (void *) conn);
+	SSL_BadCertHook(model, pg_bad_cert_handler, (void *) conn);
+
+	/*
+	 * Convert the NSPR socket to an SSL socket. Ensuring the success of this
+	 * operation is critical as NSS SSL_* functions may return SECSuccess on
+	 * the socket even though SSL hasn't been enabled, which introduce a risk
+	 * of silent downgrades.
+	 */
+	conn->pr_fd = SSL_ImportFD(model, pr_fd);
+	if (!conn->pr_fd)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to configure client for TLS: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * The model can now we closed as we've applied the settings of the model
+	 * onto the real socket. From hereon we should only use conn->pr_fd.
+	 */
+	PR_Close(model);
+
+	/* Set the private data to be passed to the password callback */
+	SSL_SetPKCS11PinArg(conn->pr_fd, (void *) conn);
+
+	/*
+	 * If a CRL file has been specified, verify if it exists in the database
+	 * but don't fail in case it doesn't.
+	 */
+	if (conn->sslcrl && strlen(conn->sslcrl) > 0)
+	{
+		/* XXX: Implement me.. */
+	}
+
+	status = SSL_ResetHandshake(conn->pr_fd, PR_FALSE);
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to initiate handshake: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * Set callback for client authentication when requested by the server.
+	 */
+	SSL_GetClientAuthDataHook(conn->pr_fd, pg_client_auth_handler, (void *) conn);
+
+	/*
+	 * Specify which hostname we are expecting to talk to. This is required,
+	 * albeit mostly applies to when opening a connection to a traditional
+	 * http server it seems.
+	 */
+	SSL_SetURL(conn->pr_fd, (conn->connhost[conn->whichhost]).host);
+
+	do
+	{
+		status = SSL_ForceHandshake(conn->pr_fd);
+	}
+	while (status != SECSuccess && PR_GetError() == PR_WOULD_BLOCK_ERROR);
+
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("SSL error: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	conn->ssl_in_use = true;
+	return PGRES_POLLING_OK;
+}
+
+ssize_t
+pgtls_read(PGconn *conn, void *ptr, size_t len)
+{
+	PRInt32		nread;
+	PRErrorCode status;
+	int			read_errno = 0;
+
+	/*
+	 * PR_Recv blocks until there is data to read or the timeout expires. We
+	 * don't want to sit blocked here, so the timeout is turned off by using
+	 * PR_INTERVAL_NO_WAIT which means "return immediately",  Zero is returned
+	 * for closed connections, while -1 indicates an error within the ongoing
+	 * connection.
+	 */
+	nread = PR_Recv(conn->pr_fd, ptr, len, 0, PR_INTERVAL_NO_WAIT);
+
+	if (nread == 0)
+	{
+		read_errno = ECONNRESET;
+		nread = -1;
+	}
+	else if (nread == -1)
+	{
+		status = PR_GetError();
+
+		switch (status)
+		{
+			case PR_IO_TIMEOUT_ERROR:
+				/* No data available yet. */
+				nread = 0;
+				break;
+
+			case PR_WOULD_BLOCK_ERROR:
+				read_errno = EWOULDBLOCK;
+				break;
+
+				/*
+				 * The error cases for PR_Recv are not documented, but can be
+				 * reverse engineered from _MD_unix_map_default_error() in the
+				 * NSPR code, defined in pr/src/md/unix/unix_errors.c.
+				 */
+			case PR_NETWORK_UNREACHABLE_ERROR:
+			case PR_CONNECT_RESET_ERROR:
+				read_errno = ECONNRESET;
+				break;
+
+			default:
+				break;
+		}
+
+		if (nread == -1)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("TLS read error: %s"),
+							  pg_SSLerrmessage(status));
+		}
+	}
+
+	SOCK_ERRNO_SET(read_errno);
+	return (ssize_t) nread;
+}
+
+/*
+ * pgtls_read_pending
+ *		Check for the existence of data to be read.
+ *
+ * This is part of the PostgreSQL TLS backend API.
+ */
+bool
+pgtls_read_pending(PGconn *conn)
+{
+	unsigned char c;
+	int			n;
+
+	/*
+	 * PR_Recv peeks into the stream with the timeount turned off, to see if
+	 * there is another byte to read off the wire. There is an NSS function
+	 * SSL_DataPending() which might seem like a better fit, but it will only
+	 * check already encrypted data in the SSL buffer, not still unencrypted
+	 * data, thus it doesn't guarantee that a subsequent call to
+	 * PR_Read/PR_Recv won't block.
+	 */
+	n = PR_Recv(conn->pr_fd, &c, 1, PR_MSG_PEEK, PR_INTERVAL_NO_WAIT);
+	return (n > 0);
+}
+
+ssize_t
+pgtls_write(PGconn *conn, const void *ptr, size_t len)
+{
+	PRInt32		n;
+	PRErrorCode status;
+	int			write_errno = 0;
+
+	n = PR_Write(conn->pr_fd, ptr, len);
+
+	if (n < 0)
+	{
+		status = PR_GetError();
+
+		switch (status)
+		{
+			case PR_WOULD_BLOCK_ERROR:
+#ifdef EAGAIN
+				write_errno = EAGAIN;
+#else
+				write_errno = EINTR;
+#endif
+				break;
+
+			default:
+				printfPQExpBuffer(&conn->errorMessage,
+								  libpq_gettext("TLS write error: %s"),
+								  pg_SSLerrmessage(status));
+				write_errno = ECONNRESET;
+				break;
+		}
+	}
+
+	SOCK_ERRNO_SET(write_errno);
+	return (ssize_t) n;
+}
+
+char *
+pgtls_get_peer_certificate_hash(PGconn *conn, size_t *len)
+{
+	CERTCertificate *server_cert;
+	SECOidTag	signature_alg;
+	SECOidTag	digest_alg;
+	int			digest_len;
+	PLArenaPool *arena;
+	SECItem		digest;
+	char	   *ret;
+	SECStatus	status;
+
+	*len = 0;
+
+	server_cert = SSL_PeerCertificate(conn->pr_fd);
+	if (!server_cert)
+		return NULL;
+
+	signature_alg = SECOID_GetAlgorithmTag(&server_cert->signature);
+	digest_alg = SEC_OID_SHA256;
+	digest_len = SHA256_LENGTH;
+
+	while (NSS_SCRAMDigestAlgorithm->signature)
+	{
+		if (signature_alg == NSS_SCRAMDigestAlgorithm->signature)
+		{
+			digest_alg = NSS_SCRAMDigestAlgorithm->hash;
+			digest_len = NSS_SCRAMDigestAlgorithm->len;
+			break;
+		}
+	}
+
+	arena = PORT_NewArena(SEC_ASN1_DEFAULT_ARENA_SIZE);
+	digest.data = PORT_ArenaZAlloc(arena, sizeof(unsigned char) * digest_len);
+	digest.len = digest_len;
+
+	status = PK11_HashBuf(digest_alg, digest.data, server_cert->derCert.data,
+						  server_cert->derCert.len);
+
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to generate peer certificate digest: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		PORT_FreeArena(arena, PR_TRUE);
+		return NULL;
+	}
+
+	ret = pg_malloc(digest.len);
+	memcpy(ret, digest.data, digest.len);
+	*len = digest_len;
+	PORT_FreeArena(arena, PR_TRUE);
+
+	return ret;
+}
+
+/*
+ *	Verify that the server certificate matches the hostname we connected to.
+ *
+ * The certificate's Common Name and Subject Alternative Names are considered.
+ */
+int
+pgtls_verify_peer_name_matches_certificate_guts(PGconn *conn,
+												int *names_examined,
+												char **first_name)
+{
+	char	   *server_hostname = NULL;
+	CERTCertificate *server_cert = NULL;
+	SECStatus	status = SECSuccess;
+	SECItem		altname_item;
+	PLArenaPool *arena = NULL;
+	CERTGeneralName *san_list;
+	CERTGeneralName *cn;
+
+	server_hostname = SSL_RevealURL(conn->pr_fd);
+	if (!server_hostname || server_hostname[0] == '\0')
+		goto done;
+
+	/*
+	 * CERT_VerifyCertName will internally perform RFC 2818 SubjectAltName
+	 * verification.
+	 */
+	server_cert = SSL_PeerCertificate(conn->pr_fd);
+	status = CERT_VerifyCertName(server_cert, server_hostname);
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to verify server hostname: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		goto done;
+	}
+
+	status = CERT_FindCertExtension(server_cert, SEC_OID_X509_SUBJECT_ALT_NAME,
+									&altname_item);
+	if (status == SECSuccess)
+	{
+		arena = PORT_NewArena(DER_DEFAULT_CHUNKSIZE);
+		if (!arena)
+		{
+			status = SECFailure;
+			goto done;
+		}
+		san_list = CERT_DecodeAltNameExtension(arena, &altname_item);
+		if (!san_list)
+		{
+			status = SECFailure;
+			goto done;
+		}
+
+		for (cn = san_list; cn != san_list; cn = CERT_GetNextGeneralName(cn))
+		{
+			char	   *alt_name;
+			int			rv;
+			char		tmp[512];
+
+			status = CERT_RFC1485_EscapeAndQuote(tmp, sizeof(tmp),
+												 (char *) cn->name.other.data,
+												 cn->name.other.len);
+
+			if (status != SECSuccess)
+				goto done;
+
+			rv = pq_verify_peer_name_matches_certificate_name(conn, tmp,
+															  strlen(tmp),
+															  &alt_name);
+			if (alt_name)
+			{
+				if (!*first_name)
+					*first_name = alt_name;
+				else
+					free(alt_name);
+			}
+
+			if (rv == 1)
+				status = SECSuccess;
+			else
+			{
+				status = SECFailure;
+				break;
+			}
+		}
+	}
+	else if (PORT_GetError() == SEC_ERROR_EXTENSION_NOT_FOUND)
+		status = SECSuccess;
+	else
+		status = SECSuccess;
+
+done:
+	/* san_list will be freed by freeing the arena it was allocated in */
+	if (arena)
+		PORT_FreeArena(arena, PR_TRUE);
+	PR_Free(server_hostname);
+
+	if (status == SECSuccess)
+		return 1;
+
+	return 0;
+}
+
+/* ------------------------------------------------------------ */
+/*			PostgreSQL specific TLS support functions			*/
+/* ------------------------------------------------------------ */
+
+static const char *
+pg_SSLerrmessage(PRErrorCode errcode)
+{
+	const char *error;
+
+	error = PR_ErrorToName(errcode);
+	if (error)
+		return error;
+
+	return "unknown TLS error";
+}
+
+static SECStatus
+pg_load_nss_module(SECMODModule * *module, const char *library, const char *name)
+{
+	SECMODModule *mod;
+	char	   *modulespec;
+
+	modulespec = psprintf("library=\"%s\", name=\"%s\"", library, name);
+
+	/*
+	 * Attempt to load the specified module. The second parameter is "parent"
+	 * which should always be NULL for application code. The third parameter
+	 * defines if loading should recurse which is only applicable when loading
+	 * a module from within another module. This hierarchy would have to be
+	 * defined in the modulespec, and since we don't support anything but
+	 * directly addressed modules we should pass PR_FALSE.
+	 */
+	mod = SECMOD_LoadUserModule(modulespec, NULL, PR_FALSE);
+	pfree(modulespec);
+
+	if (mod && mod->loaded)
+	{
+		*module = mod;
+		return SECSuccess;
+	}
+
+	SECMOD_DestroyModule(mod);
+	return SECFailure;
+}
+
+/* ------------------------------------------------------------ */
+/*						NSS Callbacks							*/
+/* ------------------------------------------------------------ */
+
+/*
+ * pg_cert_auth_handler
+ *			Callback for authenticating server certificate
+ *
+ * This is pretty much the same procedure as the SSL_AuthCertificate function
+ * provided by NSS, with the difference being server hostname validation. With
+ * SSL_AuthCertificate there is no way to do verify-ca, it only does the -full
+ * flavor of our sslmodes, so we need our own implementation.
+ */
+static SECStatus
+pg_cert_auth_handler(void *arg, PRFileDesc *fd, PRBool checksig, PRBool isServer)
+{
+	SECStatus	status;
+	PGconn	   *conn = (PGconn *) arg;
+	CERTCertificate *server_cert;
+	void	   *pin;
+
+	Assert(!isServer);
+
+	pin = SSL_RevealPinArg(conn->pr_fd);
+	server_cert = SSL_PeerCertificate(conn->pr_fd);
+
+	status = CERT_VerifyCertificateNow((CERTCertDBHandle *) CERT_GetDefaultCertDB(),
+									   server_cert,
+									   checksig,
+									   certificateUsageSSLServer,
+									   pin,
+									   NULL);
+
+	/*
+	 * If we've already failed validation then there is no point in also
+	 * performing the hostname check for verify-full.
+	 */
+	if (status == SECSuccess)
+	{
+		if (!pq_verify_peer_name_matches_certificate(conn))
+			status = SECFailure;
+	}
+	else
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to verify certificate: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+	}
+
+	return status;
+}
+
+/*
+ * pg_client_auth_handler
+ *		Callback for client certificate validation
+ *
+ * The client auth callback is not on by default in NSS, so we need to invoke
+ * it ourselves to ensure we can do cert authentication. A TODO is to support
+ * running without a specified sslcert parameter. By retrieving all the certs
+ * via nickname from the cert database and see if we find one which apply with
+ * NSS_CmpCertChainWCANames() and PK11_FindKeyByAnyCert() we could support
+ * just running with a ssl database specified.
+ *
+ * For now, we use the default client certificate validation which requires a
+ * defined nickname to identify the cert in the database.
+ */
+static SECStatus
+pg_client_auth_handler(void *arg, PRFileDesc * socket, CERTDistNames * caNames,
+					   CERTCertificate * *pRetCert, SECKEYPrivateKey * *pRetKey)
+{
+	PGconn	   *conn = (PGconn *) arg;
+
+	return NSS_GetClientAuthData(conn->sslcert, socket, caNames, pRetCert, pRetKey);
+}
+
+/*
+ * pg_bad_cert_handler
+ *		Callback for failed certificate validation
+ *
+ * The TLS handshake will call this function iff the server certificate failed
+ * validation. Depending on the sslmode, we allow the connection anyways.
+ */
+static SECStatus
+pg_bad_cert_handler(void *arg, PRFileDesc * fd)
+{
+	PGconn	   *conn = (PGconn *) arg;
+	PRErrorCode err;
+
+	/*
+	 * This really shouldn't happen, as we've the the PGconn object as our
+	 * callback data, and at the callsite we know it will be populated. That
+	 * being said, the NSS code itself performs this check even when it should
+	 * not be required so let's use the same belts with our suspenders.
+	 */
+	if (!arg)
+		return SECFailure;
+
+	/*
+	 * For sslmodes other than verify-full and verify-ca we don't perform peer
+	 * validation, so return immediately.  sslmode require with a database
+	 * specified which contains a CA certificate will work like verify-ca to
+	 * be compatible with the OpenSSL implementation.
+	 */
+	if (strcmp(conn->sslmode, "require") == 0)
+	{
+		if (conn->cert_database && strlen(conn->cert_database) > 0 && cert_database_has_CA(conn))
+			return SECFailure;
+	}
+	if (conn->sslmode[0] == 'v')
+		return SECFailure;
+
+	err = PORT_GetError();
+
+	/*
+	 * TODO: these are relevant error codes that can occur in certificate
+	 * validation, figure out which we don't want for require/prefer etc.
+	 */
+	switch (err)
+	{
+		case SEC_ERROR_INVALID_AVA:
+		case SEC_ERROR_INVALID_TIME:
+		case SEC_ERROR_BAD_SIGNATURE:
+		case SEC_ERROR_EXPIRED_CERTIFICATE:
+		case SEC_ERROR_UNKNOWN_ISSUER:
+		case SEC_ERROR_UNTRUSTED_ISSUER:
+		case SEC_ERROR_UNTRUSTED_CERT:
+		case SEC_ERROR_CERT_VALID:
+		case SEC_ERROR_EXPIRED_ISSUER_CERTIFICATE:
+		case SEC_ERROR_CRL_EXPIRED:
+		case SEC_ERROR_CRL_BAD_SIGNATURE:
+		case SEC_ERROR_EXTENSION_VALUE_INVALID:
+		case SEC_ERROR_CA_CERT_INVALID:
+		case SEC_ERROR_CERT_USAGES_INVALID:
+		case SEC_ERROR_UNKNOWN_CRITICAL_EXTENSION:
+			return SECSuccess;
+			break;
+		default:
+			return SECFailure;
+			break;
+	}
+
+	/* Unreachable */
+	return SECSuccess;
+}
+
+/* ------------------------------------------------------------ */
+/*					SSL information functions					*/
+/* ------------------------------------------------------------ */
+
+/*
+ * PQgetssl
+ *
+ * Return NULL as this is legacy and defined to always be equal to calling
+ * PQsslStruct(conn, "OpenSSL"); This should ideally trigger a logged warning
+ * somewhere as it's nonsensical to run in a non-OpenSSL build, but the color
+ * of said bikeshed hasn't yet been determined.
+ */
+void *
+PQgetssl(PGconn *conn)
+{
+	return NULL;
+}
+
+void *
+PQsslStruct(PGconn *conn, const char *struct_name)
+{
+	if (!conn)
+		return NULL;
+
+	/*
+	 * Return the underlying PRFileDesc which can be used to access
+	 * information on the connection details. There is no SSL context per se.
+	 */
+	if (strcmp(struct_name, "NSS") == 0)
+		return conn->pr_fd;
+	return NULL;
+}
+
+const char *const *
+PQsslAttributeNames(PGconn *conn)
+{
+	static const char *const result[] = {
+		"library",
+		"cipher",
+		"protocol",
+		"key_bits",
+		"compression",
+		NULL
+	};
+
+	return result;
+}
+
+const char *
+PQsslAttribute(PGconn *conn, const char *attribute_name)
+{
+	SECStatus	status;
+	SSLChannelInfo channel;
+	SSLCipherSuiteInfo suite;
+
+	if (!conn || !conn->pr_fd)
+		return NULL;
+
+	if (strcmp(attribute_name, "library") == 0)
+		return "NSS";
+
+	status = SSL_GetChannelInfo(conn->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+		return NULL;
+
+	status = SSL_GetCipherSuiteInfo(channel.cipherSuite, &suite, sizeof(suite));
+	if (status != SECSuccess)
+		return NULL;
+
+	if (strcmp(attribute_name, "cipher") == 0)
+		return suite.cipherSuiteName;
+
+	if (strcmp(attribute_name, "key_bits") == 0)
+	{
+		static char key_bits_str[8];
+
+		snprintf(key_bits_str, sizeof(key_bits_str), "%i", suite.effectiveKeyBits);
+		return key_bits_str;
+	}
+
+	if (strcmp(attribute_name, "protocol") == 0)
+	{
+		switch (channel.protocolVersion)
+		{
+#ifdef SSL_LIBRARY_VERSION_TLS_1_3
+			case SSL_LIBRARY_VERSION_TLS_1_3:
+				return "TLSv1.3";
+#endif
+#ifdef SSL_LIBRARY_VERSION_TLS_1_2
+			case SSL_LIBRARY_VERSION_TLS_1_2:
+				return "TLSv1.2";
+#endif
+#ifdef SSL_LIBRARY_VERSION_TLS_1_1
+			case SSL_LIBRARY_VERSION_TLS_1_1:
+				return "TLSv1.1";
+#endif
+			case SSL_LIBRARY_VERSION_TLS_1_0:
+				return "TLSv1.0";
+			default:
+				return "unknown";
+		}
+	}
+
+	/*
+	 * NSS disabled support for compression in version 3.33, and it was only
+	 * available for SSLv3 at that point anyways, so we can safely return off
+	 * here without checking.
+	 */
+	if (strcmp(attribute_name, "compression") == 0)
+		return "off";
+
+	return NULL;
+}
+
+static int
+ssl_protocol_version_to_nss(const char *protocol)
+{
+	if (pg_strcasecmp("TLSv1", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_0;
+
+#ifdef SSL_LIBRARY_VERSION_TLS_1_1
+	if (pg_strcasecmp("TLSv1.1", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_1;
+#endif
+
+#ifdef SSL_LIBRARY_VERSION_TLS_1_2
+	if (pg_strcasecmp("TLSv1.2", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_2;
+#endif
+
+#ifdef SSL_LIBRARY_VERSION_TLS_1_3
+	if (pg_strcasecmp("TLSv1.3", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_3;
+#endif
+
+	return -1;
+}
+
+static bool
+cert_database_has_CA(PGconn *conn)
+{
+	CERTCertList *certificates;
+	bool		hasCA;
+
+	/*
+	 * If the certificate database has a password we must provide it, since
+	 * this API doesn't invoke the standard password callback.
+	 */
+	if (conn->has_password)
+		certificates = PK11_ListCerts(PK11CertListCA, PQssl_passwd_cb(NULL, PR_FALSE, (void *) conn));
+	else
+		certificates = PK11_ListCerts(PK11CertListCA, NULL);
+	hasCA = !CERT_LIST_EMPTY(certificates);
+	CERT_DestroyCertList(certificates);
+
+	return hasCA;
+}
+
+PQsslKeyPassHook_nss_type
+PQgetSSLKeyPassHook_nss(void)
+{
+	return PQsslKeyPassHook;
+}
+
+void
+PQsetSSLKeyPassHook_nss(PQsslKeyPassHook_nss_type hook)
+{
+	PQsslKeyPassHook = hook;
+}
+
+/*
+ * Supply a password to decrypt a client certificate.
+ *
+ * This must match NSS type PK11PasswordFunc.
+ */
+static char *
+PQssl_passwd_cb(PK11SlotInfo * slot, PRBool retry, void *arg)
+{
+	PGconn	   *conn = (PGconn *) arg;
+
+	conn->has_password = true;
+
+	if (PQsslKeyPassHook)
+		return PQsslKeyPassHook(slot, (PRBool) retry, arg);
+	else
+		return PQdefaultSSLKeyPassHook_nss(slot, retry, arg);
+}
+
+/*
+ * The default password handler callback.
+ */
+char *
+PQdefaultSSLKeyPassHook_nss(PK11SlotInfo * slot, PRBool retry, void *arg)
+{
+	PGconn	   *conn = (PGconn *) arg;
+
+	/*
+	 * If the password didn't work the first time there is no point in
+	 * retrying as it hasn't changed.
+	 */
+	if (retry != PR_TRUE && conn->sslpassword && strlen(conn->sslpassword) > 0)
+		return PORT_Strdup(conn->sslpassword);
+
+	return NULL;
+}
diff --git a/src/interfaces/libpq/fe-secure.c b/src/interfaces/libpq/fe-secure.c
index 97c3805303..ff3b7c2aa6 100644
--- a/src/interfaces/libpq/fe-secure.c
+++ b/src/interfaces/libpq/fe-secure.c
@@ -427,6 +427,9 @@ PQsslAttributeNames(PGconn *conn)
 
 	return result;
 }
+#endif							/* USE_SSL */
+
+#ifndef USE_OPENSSL
 
 PQsslKeyPassHook_OpenSSL_type
 PQgetSSLKeyPassHook_OpenSSL(void)
@@ -445,7 +448,7 @@ PQdefaultSSLKeyPassHook_OpenSSL(char *buf, int size, PGconn *conn)
 {
 	return 0;
 }
-#endif							/* USE_SSL */
+#endif							/* USE_OPENSSL */
 
 /* Dummy version of GSSAPI information functions, when built without GSS support */
 #ifndef ENABLE_GSS
diff --git a/src/interfaces/libpq/libpq-fe.h b/src/interfaces/libpq/libpq-fe.h
index 3b6a9fbce3..27c16e187f 100644
--- a/src/interfaces/libpq/libpq-fe.h
+++ b/src/interfaces/libpq/libpq-fe.h
@@ -625,6 +625,17 @@ extern PQsslKeyPassHook_OpenSSL_type PQgetSSLKeyPassHook_OpenSSL(void);
 extern void PQsetSSLKeyPassHook_OpenSSL(PQsslKeyPassHook_OpenSSL_type hook);
 extern int	PQdefaultSSLKeyPassHook_OpenSSL(char *buf, int size, PGconn *conn);
 
+/* == in fe-secure-nss.c === */
+typedef struct PK11SlotInfoStr PK11SlotInfo;
+typedef int PRIntn;
+typedef PRIntn PRBool;
+
+/* Support for overriding sslpassword handling with a callback. */
+typedef char *(*PQsslKeyPassHook_nss_type) (PK11SlotInfo * slot, PRBool retry, void *arg);
+extern PQsslKeyPassHook_nss_type PQgetSSLKeyPassHook_nss(void);
+extern void PQsetSSLKeyPassHook_nss(PQsslKeyPassHook_nss_type hook);
+extern char *PQdefaultSSLKeyPassHook_nss(PK11SlotInfo * slot, PRBool retry, void *arg);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/src/interfaces/libpq/libpq-int.h b/src/interfaces/libpq/libpq-int.h
index 1de91ae295..96d7f3f534 100644
--- a/src/interfaces/libpq/libpq-int.h
+++ b/src/interfaces/libpq/libpq-int.h
@@ -362,6 +362,7 @@ struct pg_conn
 	char	   *sslpassword;	/* client key file password */
 	char	   *sslrootcert;	/* root certificate filename */
 	char	   *sslcrl;			/* certificate revocation list filename */
+	char	   *cert_database;	/* NSS certificate/key database */
 	char	   *requirepeer;	/* required peer credentials for local sockets */
 	char	   *gssencmode;		/* GSS mode (require,prefer,disable) */
 	char	   *krbsrvname;		/* Kerberos service name */
@@ -485,6 +486,23 @@ struct pg_conn
 								 * OpenSSL version changes */
 #endif
 #endif							/* USE_OPENSSL */
+
+#ifdef USE_NSS
+	void	   *pr_fd;			/* NSPR file descriptor for the connection */
+
+	/*
+	 * Track whether the NSS database has a password set or not. There is no
+	 * API function for retrieving password status of a database, but we need
+	 * to know since some NSS API calls require the password passed in (they
+	 * don't call the callback themselves). To track, we simply flip this to
+	 * true in case NSS invoked the password callback - as that will only
+	 * happen in case there is a password. The reason for tracking this is
+	 * that there are calls which require a password parameter, but doesn't
+	 * use the callbacks provided, so we must call the callback on behalf of
+	 * these.
+	 */
+	bool		has_password;
+#endif							/* USE_NSS */
 #endif							/* USE_SSL */
 
 #ifdef ENABLE_GSS
@@ -755,7 +773,7 @@ extern ssize_t pgtls_write(PGconn *conn, const void *ptr, size_t len);
  * This is not supported with old versions of OpenSSL that don't have
  * the X509_get_signature_nid() function.
  */
-#if defined(USE_OPENSSL) && defined(HAVE_X509_GET_SIGNATURE_NID)
+#if defined(USE_NSS) || (defined(USE_OPENSSL) && defined(HAVE_X509_GET_SIGNATURE_NID))
 #define HAVE_PGTLS_GET_PEER_CERTIFICATE_HASH
 extern char *pgtls_get_peer_certificate_hash(PGconn *conn, size_t *len);
 #endif
diff --git a/src/tools/msvc/Mkvcbuild.pm b/src/tools/msvc/Mkvcbuild.pm
index 90594bd41b..29879b51af 100644
--- a/src/tools/msvc/Mkvcbuild.pm
+++ b/src/tools/msvc/Mkvcbuild.pm
@@ -192,12 +192,19 @@ sub mkvcbuild
 	$postgres->FullExportDLL('postgres.lib');
 
 	# The OBJS scraper doesn't know about ifdefs, so remove appropriate files
-	# if building without OpenSSL.
-	if (!$solution->{options}->{openssl})
+	# if building without various options.
+	if (!$solution->{options}->{openssl} && !$solution->{options}->{nss})
 	{
 		$postgres->RemoveFile('src/backend/libpq/be-secure-common.c');
+	}
+	if (!$solution->{options}->{openssl})
+	{
 		$postgres->RemoveFile('src/backend/libpq/be-secure-openssl.c');
 	}
+	if (!$solution->{options}->{nss})
+	{
+		$postgres->RemoveFile('src/backend/libpq/be-secure-nss.c');
+	}
 	if (!$solution->{options}->{gss})
 	{
 		$postgres->RemoveFile('src/backend/libpq/be-gssapi-common.c');
@@ -255,12 +262,19 @@ sub mkvcbuild
 	$libpq->AddReference($libpgcommon, $libpgport);
 
 	# The OBJS scraper doesn't know about ifdefs, so remove appropriate files
-	# if building without OpenSSL.
-	if (!$solution->{options}->{openssl})
+	# if building without various options
+	if (!$solution->{options}->{openssl} && !$solution->{options}->{nss})
 	{
 		$libpq->RemoveFile('src/interfaces/libpq/fe-secure-common.c');
+	}
+	if (!$solution->{options}->{openssl})
+	{
 		$libpq->RemoveFile('src/interfaces/libpq/fe-secure-openssl.c');
 	}
+	if (!$solution->{options}->{nss})
+	{
+		$libpq->RemoveFile('src/interfaces/libpq/fe-secure-nss.c');
+	}
 	if (!$solution->{options}->{gss})
 	{
 		$libpq->RemoveFile('src/interfaces/libpq/fe-gssapi-common.c');
diff --git a/src/tools/msvc/Solution.pm b/src/tools/msvc/Solution.pm
index 17e480546c..be6df4758a 100644
--- a/src/tools/msvc/Solution.pm
+++ b/src/tools/msvc/Solution.pm
@@ -484,6 +484,7 @@ sub GenerateFiles
 		USE_NAMED_POSIX_SEMAPHORES => undef,
 		USE_OPENSSL                => undef,
 		USE_OPENSSL_RANDOM         => undef,
+		USE_NSS                    => undef,
 		USE_PAM                    => undef,
 		USE_SLICING_BY_8_CRC32C    => undef,
 		USE_SSE42_CRC32C           => undef,
@@ -537,6 +538,10 @@ sub GenerateFiles
 			$define{HAVE_OPENSSL_INIT_SSL}      = 1;
 		}
 	}
+	if ($self->{options}->{nss})
+	{
+		$define{USE_NSS} = 1;
+	}
 
 	$self->GenerateConfigHeader('src/include/pg_config.h',     \%define, 1);
 	$self->GenerateConfigHeader('src/include/pg_config_ext.h', \%define, 0);
@@ -1002,6 +1007,21 @@ sub AddProject
 			}
 		}
 	}
+	if ($self->{options}->{nss})
+	{
+		$proj->AddIncludeDir($self->{options}->{nss} . '\..\public\nss');
+		$proj->AddIncludeDir($self->{options}->{nss} . '\include\nspr');
+		foreach my $lib (qw(plds4 plc4 nspr4))
+		{
+			$proj->AddLibrary($self->{options}->{nss} .
+							  '\lib\lib' . "$lib.lib", 0);
+		}
+		foreach my $lib (qw(ssl3 smime3 nss3))
+		{
+			$proj->AddLibrary($self->{options}->{nss} .
+							  '\lib' . "\\$lib.dll.lib", 0);
+		}
+	}
 	if ($self->{options}->{nls})
 	{
 		$proj->AddIncludeDir($self->{options}->{nls} . '\include');
diff --git a/src/tools/msvc/config_default.pl b/src/tools/msvc/config_default.pl
index 2ef2cfc4e9..49dc4d5864 100644
--- a/src/tools/msvc/config_default.pl
+++ b/src/tools/msvc/config_default.pl
@@ -17,6 +17,7 @@ our $config = {
 	perl      => undef,    # --with-perl=<path>
 	python    => undef,    # --with-python=<path>
 	openssl   => undef,    # --with-openssl=<path>
+	nss       => undef,    # --with-nss=<path>
 	uuid      => undef,    # --with-uuid=<path>
 	xml       => undef,    # --with-libxml=<path>
 	xslt      => undef,    # --with-libxslt=<path>
-- 
2.21.1 (Apple Git-122.3)

From d6ac537d3d6e629d9ee5d9ec5ddc7534032195bc Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Wed, 28 Oct 2020 11:22:26 +0100
Subject: [PATCH v19 2/5] NSS Testharness updates

TODO:
	* Generate certificate/keys with NSS tooling for NSS specific test
	* Add test for certificate with embedded nulls
	* Fix SCRAM tests when channel binding works
---
 src/test/Makefile                             |   2 +-
 src/test/modules/Makefile                     |   2 +-
 .../modules/ssl_passphrase_callback/Makefile  |   2 +-
 .../ssl_passphrase_callback/t/001_testfunc.pl |   4 +-
 src/test/ssl/Makefile                         | 177 +++++++++-
 src/test/ssl/t/001_ssltests.pl                | 328 ++++++++++--------
 src/test/ssl/t/002_scram.pl                   |   8 +-
 src/test/ssl/t/SSL/Backend/NSS.pm             |  64 ++++
 src/test/ssl/t/SSL/Backend/OpenSSL.pm         | 103 ++++++
 .../ssl/t/{SSLServer.pm => SSL/Server.pm}     |  80 ++++-
 10 files changed, 611 insertions(+), 159 deletions(-)
 create mode 100644 src/test/ssl/t/SSL/Backend/NSS.pm
 create mode 100644 src/test/ssl/t/SSL/Backend/OpenSSL.pm
 rename src/test/ssl/t/{SSLServer.pm => SSL/Server.pm} (78%)

diff --git a/src/test/Makefile b/src/test/Makefile
index 14cde4f5ba..1b6876ca18 100644
--- a/src/test/Makefile
+++ b/src/test/Makefile
@@ -28,7 +28,7 @@ ifneq (,$(filter ldap,$(PG_TEST_EXTRA)))
 SUBDIRS += ldap
 endif
 endif
-ifeq ($(with_openssl),yes)
+ifeq ($(with_ssl),yes)
 ifneq (,$(filter ssl,$(PG_TEST_EXTRA)))
 SUBDIRS += ssl
 endif
diff --git a/src/test/modules/Makefile b/src/test/modules/Makefile
index a6d2ffbf9e..6e6ca97d95 100644
--- a/src/test/modules/Makefile
+++ b/src/test/modules/Makefile
@@ -27,7 +27,7 @@ SUBDIRS = \
 		  unsafe_tests \
 		  worker_spi
 
-ifeq ($(with_openssl),yes)
+ifeq ($(with_ssl),openssl)
 SUBDIRS += ssl_passphrase_callback
 else
 ALWAYS_SUBDIRS += ssl_passphrase_callback
diff --git a/src/test/modules/ssl_passphrase_callback/Makefile b/src/test/modules/ssl_passphrase_callback/Makefile
index f81265c296..a34d7ea46a 100644
--- a/src/test/modules/ssl_passphrase_callback/Makefile
+++ b/src/test/modules/ssl_passphrase_callback/Makefile
@@ -1,6 +1,6 @@
 # ssl_passphrase_callback Makefile
 
-export with_openssl
+export with_ssl
 
 MODULE_big = ssl_passphrase_func
 OBJS = ssl_passphrase_func.o $(WIN32RES)
diff --git a/src/test/modules/ssl_passphrase_callback/t/001_testfunc.pl b/src/test/modules/ssl_passphrase_callback/t/001_testfunc.pl
index dbc084f870..a2bed5336c 100644
--- a/src/test/modules/ssl_passphrase_callback/t/001_testfunc.pl
+++ b/src/test/modules/ssl_passphrase_callback/t/001_testfunc.pl
@@ -7,9 +7,9 @@ use TestLib;
 use Test::More;
 use PostgresNode;
 
-unless (($ENV{with_openssl} || 'no') eq 'yes')
+unless ($ENV{with_ssl} eq 'openssl')
 {
-	plan skip_all => 'SSL not supported by this build';
+	plan skip_all => 'OpenSSL not supported by this build';
 }
 
 my $clearpass = "FooBaR1";
diff --git a/src/test/ssl/Makefile b/src/test/ssl/Makefile
index 777ee39413..21a654b8a9 100644
--- a/src/test/ssl/Makefile
+++ b/src/test/ssl/Makefile
@@ -13,7 +13,7 @@ subdir = src/test/ssl
 top_builddir = ../../..
 include $(top_builddir)/src/Makefile.global
 
-export with_openssl
+export with_ssl
 
 CERTIFICATES := server_ca server-cn-and-alt-names \
 	server-cn-only server-single-alt-name server-multiple-alt-names \
@@ -30,6 +30,32 @@ SSLFILES := $(CERTIFICATES:%=ssl/%.key) $(CERTIFICATES:%=ssl/%.crt) \
 	ssl/client+client_ca.crt ssl/client-der.key \
 	ssl/client-encrypted-pem.key ssl/client-encrypted-der.key
 
+# Even though we in practice could get away with far fewer NSS databases, they
+# are generated to mimic the setup for the OpenSSL tests in order to ensure
+# we isolate the same behavior between the backends. The database name should
+# contain the files included for easier test suite code reading.
+NSSFILES := ssl/nss/client_ca.crt.db \
+	ssl/nss/server_ca.crt.db \
+	ssl/nss/root+server_ca.crt.db \
+	ssl/nss/root+client_ca.crt.db \
+	ssl/nss/client.crt__client.key.db \
+	ssl/nss/client-revoked.crt__client-revoked.key.db \
+	ssl/nss/server-cn-only.crt__server-password.key.db \
+	ssl/nss/server-cn-only.crt__server-cn-only.key.db \
+	ssl/nss/root.crl \
+	ssl/nss/server.crl \
+	ssl/nss/client.crl \
+	ssl/nss/server-multiple-alt-names.crt__server-multiple-alt-names.key.db \
+	ssl/nss/server-single-alt-name.crt__server-single-alt-name.key.db \
+	ssl/nss/server-cn-and-alt-names.crt__server-cn-and-alt-names.key.db \
+	ssl/nss/server-no-names.crt__server-no-names.key.db \
+	ssl/nss/server-revoked.crt__server-revoked.key.db \
+	ssl/nss/root+client.crl \
+	ssl/nss/client+client_ca.crt__client.key.db \
+	ssl/nss/client.crt__client-encrypted-pem.key.db \
+	ssl/nss/root+server_ca.crt__server.crl.db \
+	ssl/nss/root+server_ca.crt__root+server.crl.db
+
 # This target re-generates all the key and certificate files. Usually we just
 # use the ones that are committed to the tree without rebuilding them.
 #
@@ -37,6 +63,10 @@ SSLFILES := $(CERTIFICATES:%=ssl/%.key) $(CERTIFICATES:%=ssl/%.crt) \
 #
 sslfiles: $(SSLFILES)
 
+# Generate NSS certificate databases corresponding to the OpenSSL certificates.
+# This target will fail unless preceded by nssfiles-clean.
+nssfiles: $(NSSFILES)
+
 # OpenSSL requires a directory to put all generated certificates in. We don't
 # use this for anything, but we need a location.
 ssl/new_certs_dir:
@@ -64,6 +94,24 @@ ssl/%_ca.crt: ssl/%_ca.key %_ca.config ssl/root_ca.crt ssl/new_certs_dir
 	rm ssl/temp_ca.crt ssl/temp_ca_signed.crt
 	echo "01" > ssl/$*_ca.srl
 
+ssl/nss/%_ca.crt.db: ssl/%_ca.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n $*_ca.crt -i ssl/$*_ca.crt -t "CT,C,C"
+
+ssl/nss/root+server_ca.crt__server.crl.db: ssl/root+server_ca.crt ssl/nss/server.crl
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	crlutil -I -i ssl/nss/server.crl -d $@ -B
+
+ssl/nss/root+server_ca.crt__root+server.crl.db: ssl/root+server_ca.crt ssl/nss/root.crl ssl/nss/server.crl
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	crlutil -I -i ssl/nss/root.crl -d $@ -B
+	crlutil -I -i ssl/nss/server.crl -d $@ -B
+
 # Server certificates, signed by server CA:
 ssl/server-%.crt: ssl/server-%.key ssl/server_ca.crt server-%.config
 	openssl req -new -key ssl/server-$*.key -out ssl/server-$*.csr -config server-$*.config
@@ -77,6 +125,78 @@ ssl/server-ss.crt: ssl/server-cn-only.key ssl/server-cn-only.crt server-cn-only.
 	openssl x509 -req -days 10000 -in ssl/server-ss.csr -signkey ssl/server-cn-only.key -out ssl/server-ss.crt  -extensions v3_req -extfile server-cn-only.config
 	rm ssl/server-ss.csr
 
+# pk12util won't preserve the password when importing the password protected
+# key, the password must be set on the database *before* importing it as the
+# password in the pkcs12 envelope will be dropped.
+ssl/nss/server-cn-only.crt__server-password.key.db: ssl/server-cn-only.crt
+	$(MKDIR_P) $@
+	echo "secret1" > password.txt
+	certutil -d "sql:$@" -N -f password.txt
+	certutil -d "sql:$@" -A -n ssl/server-cn-only.crt -i ssl/server-cn-only.crt -t "CT,C,C" -f password.txt
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C" -f password.txt
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C" -f password.txt
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C" -f password.txt
+	openssl pkcs12 -export -out ssl/nss/server-password.pfx -inkey ssl/server-password.key -in ssl/server-cn-only.crt -certfile ssl/server_ca.crt -passin 'pass:secret1' -passout 'pass:secret1'
+	pk12util -i ssl/nss/server-password.pfx -d "sql:$@" -W 'secret1' -K 'secret1'
+
+ssl/nss/server-cn-only.crt__server-cn-only.key.db: ssl/server-cn-only.crt ssl/server-cn-only.key
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-cn-only.crt -i ssl/server-cn-only.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-cn-only.pfx -inkey ssl/server-cn-only.key -in ssl/server-cn-only.crt -certfile ssl/server_ca.crt -passout pass:
+	pk12util -i ssl/nss/server-cn-only.pfx -d "sql:$@" -W ''
+
+ssl/nss/server-multiple-alt-names.crt__server-multiple-alt-names.key.db: ssl/server-multiple-alt-names.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-multiple-alt-names.crt -i ssl/server-multiple-alt-names.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-multiple-alt-names.pfx -inkey ssl/server-multiple-alt-names.key -in ssl/server-multiple-alt-names.crt -certfile ssl/server-multiple-alt-names.crt -passout pass:
+	pk12util -i ssl/nss/server-multiple-alt-names.pfx -d "sql:$@" -W ''
+
+ssl/nss/server-single-alt-name.crt__server-single-alt-name.key.db: ssl/server-single-alt-name.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-single-alt-name.crt -i ssl/server-single-alt-name.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-single-alt-name.pfx -inkey ssl/server-single-alt-name.key -in ssl/server-single-alt-name.crt -certfile ssl/server-single-alt-name.crt -passout pass:
+	pk12util -i ssl/nss/server-single-alt-name.pfx -d "sql:$@" -W ''
+
+ssl/nss/server-cn-and-alt-names.crt__server-cn-and-alt-names.key.db: ssl/server-cn-and-alt-names.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-cn-and-alt-names.crt -i ssl/server-cn-and-alt-names.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-cn-and-alt-names.pfx -inkey ssl/server-cn-and-alt-names.key -in ssl/server-cn-and-alt-names.crt -certfile ssl/server-cn-and-alt-names.crt -passout pass:
+	pk12util -i ssl/nss/server-cn-and-alt-names.pfx -d $@ -W ''
+
+ssl/nss/server-no-names.crt__server-no-names.key.db: ssl/server-no-names.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-no-names.crt -i ssl/server-no-names.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-no-names.pfx -inkey ssl/server-no-names.key -in ssl/server-no-names.crt -certfile ssl/server-no-names.crt -passout pass:
+	pk12util -i ssl/nss/server-no-names.pfx -d "sql:$@" -W ''
+
+ssl/nss/server-revoked.crt__server-revoked.key.db: ssl/server-revoked.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-revoked.crt -i ssl/server-revoked.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-revoked.pfx -inkey ssl/server-revoked.key -in ssl/server-revoked.crt -certfile ssl/server-revoked.crt -passout pass:
+	pk12util -i ssl/nss/server-revoked.pfx -d "sql:$@" -W ''
+
 # Password-protected version of server-cn-only.key
 ssl/server-password.key: ssl/server-cn-only.key
 	openssl rsa -aes256 -in $< -out $@ -passout 'pass:secret1'
@@ -88,6 +208,27 @@ ssl/client.crt: ssl/client.key ssl/client_ca.crt
 	openssl x509 -in ssl/temp.crt -out ssl/client.crt # to keep just the PEM cert
 	rm ssl/client.csr ssl/temp.crt
 
+# Client certificate, signed by client CA
+ssl/nss/client.crt__client.key.db: ssl/client.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/client.crt -i ssl/client.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root+client_ca.crt -i ssl/root+client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client.pfx -inkey ssl/client.key -in ssl/client.crt -certfile ssl/client_ca.crt -passout pass:
+	pk12util -i ssl/nss/client.pfx -d "sql:$@" -W ''
+
+# Client certificate with encrypted key, signed by client CA
+ssl/nss/client.crt__client-encrypted-pem.key.db: ssl/client.crt
+	$(MKDIR_P) $@
+	echo 'dUmmyP^#+' > $@.pass
+	certutil -d "sql:$@" -N -f $@.pass
+	certutil -d "sql:$@" -A -f $@.pass -n ssl/client.crt -i ssl/client.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -f $@.pass -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -f $@.pass -n root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client-encrypted-pem.pfx -inkey ssl/client-encrypted-pem.key -in ssl/client.crt -certfile ssl/client_ca.crt -passin pass:'dUmmyP^#+' -passout pass:'dUmmyP^#+'
+	pk12util -i ssl/nss/client-encrypted-pem.pfx -d "sql:$@" -W 'dUmmyP^#+' -k $@.pass
+
 # Another client certificate, signed by the client CA. This one is revoked.
 ssl/client-revoked.crt: ssl/client-revoked.key ssl/client_ca.crt client.config
 	openssl req -new -key ssl/client-revoked.key -out ssl/client-revoked.csr -config client.config
@@ -95,6 +236,14 @@ ssl/client-revoked.crt: ssl/client-revoked.key ssl/client_ca.crt client.config
 	openssl x509 -in ssl/temp.crt -out ssl/client-revoked.crt # to keep just the PEM cert
 	rm ssl/client-revoked.csr ssl/temp.crt
 
+ssl/nss/client-revoked.crt__client-revoked.key.db: ssl/client-revoked.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/client-revoked.crt -i ssl/client-revoked.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client-revoked.pfx -inkey ssl/client-revoked.key -in ssl/client-revoked.crt -certfile ssl/client_ca.crt -passout pass:
+	pk12util -i ssl/nss/client-revoked.pfx -d "sql:$@" -W ''
+
 # Convert the key to DER, to test our behaviour there too
 ssl/client-der.key: ssl/client.key
 	openssl rsa -in ssl/client.key -outform DER -out ssl/client-der.key
@@ -127,19 +276,40 @@ ssl/root+client_ca.crt: ssl/root_ca.crt ssl/client_ca.crt
 ssl/client+client_ca.crt: ssl/client.crt ssl/client_ca.crt
 	cat $^ > $@
 
+# Client certificate, signed by client CA
+ssl/nss/client+client_ca.crt__client.key.db: ssl/client+client_ca.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/client+client_ca.crt -i ssl/client+client_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n ssl/root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client.pfx -inkey ssl/client.key -in ssl/client.crt -certfile ssl/client_ca.crt -passout pass:
+	pk12util -i ssl/nss/client.pfx -d "sql:$@" -W ''
+
 #### CRLs
 
 ssl/client.crl: ssl/client-revoked.crt
 	openssl ca -config cas.config -name client_ca -revoke ssl/client-revoked.crt
 	openssl ca -config cas.config -name client_ca -gencrl -out ssl/client.crl
 
+ssl/nss/client.crl: ssl/client.crl
+	openssl crl -in $^ -outform der -out $@
+
 ssl/server.crl: ssl/server-revoked.crt
 	openssl ca -config cas.config -name server_ca -revoke ssl/server-revoked.crt
 	openssl ca -config cas.config -name server_ca -gencrl -out ssl/server.crl
 
+ssl/nss/server.crl: ssl/server.crl
+	openssl crl -in $^ -outform der -out $@
+
 ssl/root.crl: ssl/root_ca.crt
 	openssl ca -config cas.config -name root_ca -gencrl -out ssl/root.crl
 
+ssl/nss/root.crl: ssl/root.crl
+	openssl crl -in $^ -outform der -out $@
+
+ssl/nss/root+client.crl: ssl/root+client.crl
+	openssl crl -in $^ -outform der -out $@
+
 # If a CRL is used, OpenSSL requires a CRL file for *all* the CAs in the
 # chain, even if some of them are empty.
 ssl/root+server.crl: ssl/root.crl ssl/server.crl
@@ -151,9 +321,14 @@ ssl/root+client.crl: ssl/root.crl ssl/client.crl
 sslfiles-clean:
 	rm -f $(SSLFILES) ssl/client_ca.srl ssl/server_ca.srl ssl/client_ca-certindex* ssl/server_ca-certindex* ssl/root_ca-certindex* ssl/root_ca.srl ssl/temp_ca.crt ssl/temp_ca_signed.crt
 
+.PHONY: nssfiles-clean
+nssfiles-clean:
+	rm -rf ssl/nss
+
 clean distclean maintainer-clean:
 	rm -rf tmp_check
 	rm -rf ssl/*.old ssl/new_certs_dir ssl/client*_tmp.key
+	rm -rf ssl/nss
 
 # Doesn't depend on $(SSLFILES) because we don't rebuild them by default
 check:
diff --git a/src/test/ssl/t/001_ssltests.pl b/src/test/ssl/t/001_ssltests.pl
index fd2727b568..7593d45877 100644
--- a/src/test/ssl/t/001_ssltests.pl
+++ b/src/test/ssl/t/001_ssltests.pl
@@ -4,17 +4,24 @@ use PostgresNode;
 use TestLib;
 use Test::More;
 
-use File::Copy;
-
 use FindBin;
 use lib $FindBin::RealBin;
 
-use SSLServer;
+use SSL::Server;
+
+my $openssl;
+my $nss;
 
-if ($ENV{with_openssl} eq 'yes')
+if ($ENV{with_ssl} eq 'openssl')
 {
+	$openssl = 1;
 	plan tests => 93;
 }
+elsif ($ENV{with_ssl} eq 'nss')
+{
+	$nss = 1;
+	plan tests => 98;
+}
 else
 {
 	plan skip_all => 'SSL not supported by this build';
@@ -32,32 +39,6 @@ my $SERVERHOSTCIDR = '127.0.0.1/32';
 # Allocation of base connection string shared among multiple tests.
 my $common_connstr;
 
-# The client's private key must not be world-readable, so take a copy
-# of the key stored in the code tree and update its permissions.
-#
-# This changes ssl/client.key to ssl/client_tmp.key etc for the rest
-# of the tests.
-my @keys = (
-	"client",     "client-revoked",
-	"client-der", "client-encrypted-pem",
-	"client-encrypted-der");
-foreach my $key (@keys)
-{
-	copy("ssl/${key}.key", "ssl/${key}_tmp.key")
-	  or die
-	  "couldn't copy ssl/${key}.key to ssl/${key}_tmp.key for permissions change: $!";
-	chmod 0600, "ssl/${key}_tmp.key"
-	  or die "failed to change permissions on ssl/${key}_tmp.key: $!";
-}
-
-# Also make a copy of that explicitly world-readable.  We can't
-# necessarily rely on the file in the source tree having those
-# permissions.  Add it to @keys to include it in the final clean
-# up phase.
-copy("ssl/client.key", "ssl/client_wrongperms_tmp.key");
-chmod 0644, "ssl/client_wrongperms_tmp.key";
-push @keys, 'client_wrongperms';
-
 #### Set up the server.
 
 note "setting up data directory";
@@ -72,36 +53,65 @@ $node->start;
 
 # Run this before we lock down access below.
 my $result = $node->safe_psql('postgres', "SHOW ssl_library");
-is($result, 'OpenSSL', 'ssl_library parameter');
+is($result, SSL::Server::ssl_library(), 'ssl_library parameter');
 
 configure_test_server_for_ssl($node, $SERVERHOSTADDR, $SERVERHOSTCIDR,
 	'trust');
 
 note "testing password-protected keys";
 
-open my $sslconf, '>', $node->data_dir . "/sslconfig.conf";
-print $sslconf "ssl=on\n";
-print $sslconf "ssl_cert_file='server-cn-only.crt'\n";
-print $sslconf "ssl_key_file='server-password.key'\n";
-print $sslconf "ssl_passphrase_command='echo wrongpassword'\n";
-close $sslconf;
+# Since the passphrase callbacks operate at different stages in OpenSSL and
+# NSS we have two separate blocks for them.
+SKIP:
+{
+	skip "Certificate passphrases aren't checked on server restart in NSS", 2
+	  if ($nss);
+
+	set_server_cert($node, 'server-cn-only', 'root+client_ca',
+					   'server-password', 'echo wrongpassword');
+	command_fails(
+		[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
+		'restart fails with password-protected key file with wrong password');
+	$node->_update_pid(0);
+
+	set_server_cert($node, 'server-cn-only', 'root+client_ca',
+					'server-password', 'echo secret1');
+	command_ok(
+		[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
+		'restart succeeds with password-protected key file');
+	$node->_update_pid(1);
+}
 
-command_fails(
-	[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
-	'restart fails with password-protected key file with wrong password');
-$node->_update_pid(0);
+SKIP:
+{
+	skip "Certificate passphrases are checked on connection in NSS", 5
+	  if ($openssl);
 
-open $sslconf, '>', $node->data_dir . "/sslconfig.conf";
-print $sslconf "ssl=on\n";
-print $sslconf "ssl_cert_file='server-cn-only.crt'\n";
-print $sslconf "ssl_key_file='server-password.key'\n";
-print $sslconf "ssl_passphrase_command='echo secret1'\n";
-close $sslconf;
+	set_server_cert($node, 'server-cn-only', 'root+client_ca',
+					   'server-password', 'echo wrongpassword');
+	command_ok(
+		[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
+		'restart fails with password-protected key file with wrong password');
+	$node->_update_pid(1);
 
-command_ok(
-	[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
-	'restart succeeds with password-protected key file');
-$node->_update_pid(1);
+	test_connect_fails(
+		"user=ssltestuser dbname=trustdb sslcert=invalid hostaddr=$SERVERHOSTADDR host=common-name.pg-ssltest.test",
+		"sslrootcert=invalid sslmode=require",
+		qr/\QSSL error\E/,
+		"connect to server with incorrect key password configured");
+
+	set_server_cert($node, 'server-cn-only', 'root+client_ca',
+					   'server-password', 'echo secret1');
+	command_ok(
+		[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
+		'restart fails with password-protected key file with wrong password');
+	$node->_update_pid(1);
+
+	test_connect_ok(
+		"user=ssltestuser dbname=trustdb sslcert=invalid hostaddr=$SERVERHOSTADDR host=common-name.pg-ssltest.test",
+		"sslrootcert=invalid sslmode=require",
+		"connect to server with correct key password configured");
+}
 
 # Test compatibility of SSL protocols.
 # TLSv1.1 is lower than TLSv1.2, so it won't work.
@@ -149,82 +159,105 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"sslrootcert=invalid sslmode=verify-ca",
-	qr/root certificate file "invalid" does not exist/,
+	qr/root certificate file "invalid" does not exist|could not connect to server/,
 	"connect without server root cert sslmode=verify-ca");
 test_connect_fails(
 	$common_connstr,
 	"sslrootcert=invalid sslmode=verify-full",
-	qr/root certificate file "invalid" does not exist/,
+	qr/root certificate file "invalid" does not exist|could not connect to server/,
 	"connect without server root cert sslmode=verify-full");
 
 # Try with wrong root cert, should fail. (We're using the client CA as the
 # root, but the server's key is signed by the server CA.)
-test_connect_fails($common_connstr,
-	"sslrootcert=ssl/client_ca.crt sslmode=require",
-	qr/SSL error/, "connect with wrong server root cert sslmode=require");
-test_connect_fails($common_connstr,
-	"sslrootcert=ssl/client_ca.crt sslmode=verify-ca",
-	qr/SSL error/, "connect with wrong server root cert sslmode=verify-ca");
-test_connect_fails($common_connstr,
-	"sslrootcert=ssl/client_ca.crt sslmode=verify-full",
-	qr/SSL error/, "connect with wrong server root cert sslmode=verify-full");
-
-# Try with just the server CA's cert. This fails because the root file
-# must contain the whole chain up to the root CA.
-test_connect_fails($common_connstr,
-	"sslrootcert=ssl/server_ca.crt sslmode=verify-ca",
-	qr/SSL error/, "connect with server CA cert, without root CA");
+test_connect_fails(
+	$common_connstr,
+	"sslrootcert=ssl/client_ca.crt sslmode=require cert_database=ssl/nss/client_ca.crt.db",
+	qr/SSL error/,
+	"connect with wrong server root cert sslmode=require");
+test_connect_fails(
+	$common_connstr,
+	"sslrootcert=ssl/client_ca.crt sslmode=verify-ca cert_database=ssl/nss/client_ca.crt.db",
+	qr/SSL error/,
+	"connect with wrong server root cert sslmode=verify-ca");
+test_connect_fails(
+	$common_connstr,
+	"sslrootcert=ssl/client_ca.crt sslmode=verify-full cert_database=ssl/nss/client_ca.crt.db",
+	qr/SSL error/,
+	"connect with wrong server root cert sslmode=verify-full");
+
+SKIP:
+{
+	# NSS supports partial chain validation, so this test doesn't work there.
+	# This is similar to the OpenSSL option X509_V_FLAG_PARTIAL_CHAIN which
+	# we don't allow.
+	skip "NSS support partial chain validation", 2 if ($nss);
+	# Try with just the server CA's cert. This fails because the root file
+	# must contain the whole chain up to the root CA.
+	test_connect_fails($common_connstr,
+		"sslrootcert=ssl/server_ca.crt sslmode=verify-ca",
+		qr/SSL error/, "connect with server CA cert, without root CA");
+}
 
 # And finally, with the correct root cert.
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require cert_database=ssl/nss/root+server_ca.crt.db",
 	"connect with correct server CA cert file sslmode=require");
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca cert_database=ssl/nss/root+server_ca.crt.db",
 	"connect with correct server CA cert file sslmode=verify-ca");
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-full",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db",
 	"connect with correct server CA cert file sslmode=verify-full");
 
-# Test with cert root file that contains two certificates. The client should
-# be able to pick the right one, regardless of the order in the file.
-test_connect_ok(
-	$common_connstr,
-	"sslrootcert=ssl/both-cas-1.crt sslmode=verify-ca",
-	"cert root file that contains two certificates, order 1");
-test_connect_ok(
-	$common_connstr,
-	"sslrootcert=ssl/both-cas-2.crt sslmode=verify-ca",
-	"cert root file that contains two certificates, order 2");
+SKIP:
+{
+	skip "CA ordering is irrelevant in NSS databases", 2 if ($nss);
 
+	# Test with cert root file that contains two certificates. The client should
+	# be able to pick the right one, regardless of the order in the file.
+	test_connect_ok(
+		$common_connstr,
+		"sslrootcert=ssl/both-cas-1.crt sslmode=verify-ca",
+		"cert root file that contains two certificates, order 1");
+
+	# How about import the both-file into a database?
+	test_connect_ok(
+		$common_connstr,
+		"sslrootcert=ssl/both-cas-2.crt sslmode=verify-ca",
+		"cert root file that contains two certificates, order 2");
+}
 # CRL tests
 
 # Invalid CRL filename is the same as no CRL, succeeds
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=invalid",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=invalid cert_database=ssl/nss/root+server_ca.crt.db",
 	"sslcrl option with invalid file name");
 
-# A CRL belonging to a different CA is not accepted, fails
-test_connect_fails(
-	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/client.crl",
-	qr/SSL error/,
-	"CRL belonging to a different CA");
+SKIP:
+{
+	skip "CRL's are verified when adding to NSS database", 2 if ($nss);
+	# A CRL belonging to a different CA is not accepted, fails
+	test_connect_fails(
+		$common_connstr,
+		"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/client.crl",
+		qr/SSL error/,
+		"CRL belonging to a different CA");
+}
 
 # With the correct CRL, succeeds (this cert is not revoked)
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/root+server.crl",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/root+server.crl cert_database=ssl/nss/root+server_ca.crt__root+server.crl.db",
 	"CRL with a non-revoked cert");
 
 # Check that connecting with verify-full fails, when the hostname doesn't
 # match the hostname in the server's certificate.
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -237,14 +270,14 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"sslmode=verify-full host=wronghost.test",
-	qr/\Qserver certificate for "common-name.pg-ssltest.test" does not match host name "wronghost.test"\E/,
+	qr/\Qserver certificate for "common-name.pg-ssltest.test" does not match host name "wronghost.test"\E|SSL_ERROR_BAD_CERT_DOMAIN/,
 	"mismatch between host name and server certificate sslmode=verify-full");
 
 # Test Subject Alternative Names.
 switch_server_cert($node, 'server-multiple-alt-names');
 
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -262,12 +295,12 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"host=wronghost.alt-name.pg-ssltest.test",
-	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "wronghost.alt-name.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "wronghost.alt-name.pg-ssltest.test"\E|SSL_ERROR_BAD_CERT_DOMAIN/,
 	"host name not matching with X.509 Subject Alternative Names");
 test_connect_fails(
 	$common_connstr,
 	"host=deep.subdomain.wildcard.pg-ssltest.test",
-	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E|SSL_ERROR_BAD_CERT_DOMAIN/,
 	"host name not matching with X.509 Subject Alternative Names wildcard");
 
 # Test certificate with a single Subject Alternative Name. (this gives a
@@ -275,7 +308,7 @@ test_connect_fails(
 switch_server_cert($node, 'server-single-alt-name');
 
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -285,12 +318,12 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"host=wronghost.alt-name.pg-ssltest.test",
-	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "wronghost.alt-name.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "wronghost.alt-name.pg-ssltest.test"\E|SSL_ERROR_BAD_CERT_DOMAIN/,
 	"host name not matching with a single X.509 Subject Alternative Name");
 test_connect_fails(
 	$common_connstr,
 	"host=deep.subdomain.wildcard.pg-ssltest.test",
-	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E|SSL_ERROR_BAD_CERT_DOMAIN/,
 	"host name not matching with a single X.509 Subject Alternative Name wildcard"
 );
 
@@ -299,7 +332,7 @@ test_connect_fails(
 switch_server_cert($node, 'server-cn-and-alt-names');
 
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -312,14 +345,14 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"host=common-name.pg-ssltest.test",
-	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 1 other name) does not match host name "common-name.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 1 other name) does not match host name "common-name.pg-ssltest.test"\E|SSL_ERROR_BAD_CERT_DOMAIN/,
 	"certificate with both a CN and SANs ignores CN");
 
 # Finally, test a server certificate that has no CN or SANs. Of course, that's
 # not a very sensible certificate, but libpq should handle it gracefully.
 switch_server_cert($node, 'server-no-names');
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -328,7 +361,7 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"sslmode=verify-full host=common-name.pg-ssltest.test",
-	qr/could not get server's host name from server certificate/,
+	qr/could not get server's host name from server certificate|SSL_ERROR_BAD_CERT_DOMAIN/,
 	"server certificate without CN or SANs sslmode=verify-full");
 
 # Test that the CRL works
@@ -340,11 +373,11 @@ $common_connstr =
 # Without the CRL, succeeds. With it, fails.
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca cert_database=ssl/nss/root+server_ca.crt.db",
 	"connects without client-side CRL");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/root+server.crl",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/server.crl cert_database=ssl/nss/root+server_ca.crt__server.crl.db",
 	qr/SSL error/,
 	"does not connect with client-side CRL");
 
@@ -365,21 +398,21 @@ command_like(
 # Test min/max SSL protocol versions.
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.2",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.2 cert_database=ssl/nss/root+server_ca.crt.db",
 	"connection success with correct range of TLS protocol versions");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.1",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.1 cert_database=ssl/nss/root+server_ca.crt.db",
 	qr/invalid SSL protocol version range/,
 	"connection failure with incorrect range of TLS protocol versions");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=incorrect_tls",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=incorrect_tls cert_database=ssl/nss/root+server_ca.crt.db",
 	qr/invalid ssl_min_protocol_version value/,
 	"connection failure with an incorrect SSL protocol minimum bound");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_max_protocol_version=incorrect_tls",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_max_protocol_version=incorrect_tls cert_database=ssl/nss/root+server_ca.crt.db",
 	qr/invalid ssl_max_protocol_version value/,
 	"connection failure with an incorrect SSL protocol maximum bound");
 
@@ -390,7 +423,7 @@ test_connect_fails(
 note "running server tests";
 
 $common_connstr =
-  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR";
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client.crt__client.key.db";
 
 # no client cert
 test_connect_fails(
@@ -406,32 +439,43 @@ test_connect_ok(
 	"certificate authorization succeeds with correct client cert in PEM format"
 );
 
-# correct client cert in unencrypted DER
-test_connect_ok(
-	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-der_tmp.key",
-	"certificate authorization succeeds with correct client cert in DER format"
-);
+$common_connstr =
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR";
+
+SKIP:
+{
+	skip "NSS database not implemented in the Makefile", 1 if ($nss);
+	# correct client cert in unencrypted DER
+	test_connect_ok(
+		$common_connstr,
+		"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-der_tmp.key",
+		"certificate authorization succeeds with correct client cert in DER format"
+	);
+}
 
 # correct client cert in encrypted PEM
 test_connect_ok(
 	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='dUmmyP^#+'",
+	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='dUmmyP^#+' cert_database=ssl/nss/client.crt__client-encrypted-pem.key.db",
 	"certificate authorization succeeds with correct client cert in encrypted PEM format"
 );
 
-# correct client cert in encrypted DER
-test_connect_ok(
-	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-der_tmp.key sslpassword='dUmmyP^#+'",
-	"certificate authorization succeeds with correct client cert in encrypted DER format"
-);
+SKIP:
+{
+	skip "NSS database not implemented in the Makefile", 1 if ($nss);
+	# correct client cert in encrypted DER
+	test_connect_ok(
+		$common_connstr,
+		"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-der_tmp.key sslpassword='dUmmyP^#+'",
+		"certificate authorization succeeds with correct client cert in encrypted DER format"
+	);
+}
 
 # correct client cert in encrypted PEM with wrong password
 test_connect_fails(
 	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='wrong'",
-	qr!\Qprivate key file "ssl/client-encrypted-pem_tmp.key": bad decrypt\E!,
+	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='wrong' cert_database=ssl/nss/client.crt__client-encrypted-pem.key.db",
+	qr!connection requires a valid client certificate|\Qprivate key file "ssl/client-encrypted-pem_tmp.key": bad decrypt\E!,
 	"certificate authorization fails with correct client cert and wrong password in encrypted PEM format"
 );
 
@@ -471,18 +515,19 @@ command_like(
 		'-P',
 		'null=_null_',
 		'-d',
-		"$common_connstr user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client_tmp.key",
+		"$common_connstr user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client_tmp.key cert_database=ssl/nss/client.crt__client.key.db",
 		'-c',
 		"SELECT * FROM pg_stat_ssl WHERE pid = pg_backend_pid()"
 	],
 	qr{^pid,ssl,version,cipher,bits,compression,client_dn,client_serial,issuer_dn\r?\n
-				^\d+,t,TLSv[\d.]+,[\w-]+,\d+,f,/CN=ssltestuser,1,\Q/CN=Test CA for PostgreSQL SSL regression test client certs\E\r?$}mx,
+				^\d+,t,TLSv[\d.]+,[\w-]+,\d+,f,/?CN=ssltestuser,1,/?\QCN=Test CA for PostgreSQL SSL regression test client certs\E\r?$}mx,
 	'pg_stat_ssl with client certificate');
 
 # client key with wrong permissions
 SKIP:
 {
 	skip "Permissions check not enforced on Windows", 2 if ($windows_os);
+	skip "Key not on filesystem with NSS",            2 if ($nss);
 
 	test_connect_fails(
 		$common_connstr,
@@ -495,10 +540,13 @@ SKIP:
 test_connect_fails(
 	$common_connstr,
 	"user=anotheruser sslcert=ssl/client.crt sslkey=ssl/client_tmp.key",
-	qr/certificate authentication failed for user "anotheruser"/,
+	qr/unable to verify certificate|certificate authentication failed for user "anotheruser"/,
 	"certificate authorization fails with client cert belonging to another user"
 );
 
+$common_connstr =
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client-revoked.crt__client-revoked.key.db";
+
 # revoked client cert
 test_connect_fails(
 	$common_connstr,
@@ -510,7 +558,7 @@ test_connect_fails(
 # works, iff username matches Common Name
 # fails, iff username doesn't match Common Name.
 $common_connstr =
-  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=verifydb hostaddr=$SERVERHOSTADDR";
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=verifydb hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client.crt__client.key.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -536,17 +584,23 @@ test_connect_ok(
 # intermediate client_ca.crt is provided by client, and isn't in server's ssl_ca_file
 switch_server_cert($node, 'server-cn-only', 'root_ca');
 $common_connstr =
-  "user=ssltestuser dbname=certdb sslkey=ssl/client_tmp.key sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR";
+  "user=ssltestuser dbname=certdb sslkey=ssl/client_tmp.key sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client+client_ca.crt__client.key.db";
 
-test_connect_ok(
+TODO:
+{
+	local $TODO = "WIP failure cause currently unknown";
+	test_connect_ok(
+		$common_connstr,
+		"sslmode=require sslcert=ssl/client+client_ca.crt",
+		"intermediate client certificate is provided by client");
+}
+
+test_connect_fails(
 	$common_connstr,
-	"sslmode=require sslcert=ssl/client+client_ca.crt",
-	"intermediate client certificate is provided by client");
-test_connect_fails($common_connstr, "sslmode=require sslcert=ssl/client.crt",
-	qr/SSL error/, "intermediate client certificate is missing");
+	"sslmode=require sslcert=ssl/client.crt",
+	qr/connection requires a valid client certificate|SSL error/,
+	"intermediate client certificate is missing");
 
 # clean up
-foreach my $key (@keys)
-{
-	unlink("ssl/${key}_tmp.key");
-}
+
+SSL::Server::cleanup();
diff --git a/src/test/ssl/t/002_scram.pl b/src/test/ssl/t/002_scram.pl
index a088f71a1a..7ed7c3b5ec 100644
--- a/src/test/ssl/t/002_scram.pl
+++ b/src/test/ssl/t/002_scram.pl
@@ -11,12 +11,16 @@ use File::Copy;
 use FindBin;
 use lib $FindBin::RealBin;
 
-use SSLServer;
+use SSL::Server;
 
-if ($ENV{with_openssl} ne 'yes')
+if ($ENV{with_ssl} eq 'no')
 {
 	plan skip_all => 'SSL not supported by this build';
 }
+elsif ($ENV{with_ssl} eq 'nss')
+{
+	plan skip_all => 'channel binding not supported with NSS';
+}
 
 # This is the hostname used to connect to the server.
 my $SERVERHOSTADDR = '127.0.0.1';
diff --git a/src/test/ssl/t/SSL/Backend/NSS.pm b/src/test/ssl/t/SSL/Backend/NSS.pm
new file mode 100644
index 0000000000..837f0d9891
--- /dev/null
+++ b/src/test/ssl/t/SSL/Backend/NSS.pm
@@ -0,0 +1,64 @@
+package SSL::Backend::NSS;
+
+use strict;
+use warnings;
+use Exporter;
+
+our @ISA       = qw(Exporter);
+our @EXPORT_OK = qw(get_new_nss_backend);
+
+sub new
+{
+	my ($class) = @_;
+
+	my $self = { _library => 'NSS' };
+
+	bless $self, $class;
+
+	return $self;
+}
+
+sub get_new_nss_backend
+{
+	my $class = 'SSL::Backend::NSS';
+
+	return $class->new();
+}
+
+sub init
+{
+	# Make sure the certificate databases are in place?
+}
+
+sub get_library
+{
+	my ($self) = @_;
+
+	return $self->{_library};
+}
+
+sub set_server_cert
+{
+	my $self     = $_[0];
+	my $certfile = $_[1];
+	my $cafile   = $_[2];
+	my $keyfile  = $_[3];
+
+	my $cert_nickname = $certfile . '.crt__' . $keyfile . '.key';
+	my $cert_database = $cert_nickname . '.db';
+
+	my $sslconf =
+	    "ssl_ca_file='$cafile.crt'\n"
+	  . "ssl_cert_file='ssl/$certfile.crt'\n"
+	  . "ssl_crl_file=''\n"
+	  . "ssl_database='nss/$cert_database'\n";
+
+	return $sslconf;
+}
+
+sub cleanup
+{
+	# Something?
+}
+
+1;
diff --git a/src/test/ssl/t/SSL/Backend/OpenSSL.pm b/src/test/ssl/t/SSL/Backend/OpenSSL.pm
new file mode 100644
index 0000000000..62b11b7632
--- /dev/null
+++ b/src/test/ssl/t/SSL/Backend/OpenSSL.pm
@@ -0,0 +1,103 @@
+package SSL::Backend::OpenSSL;
+
+use strict;
+use warnings;
+use Exporter;
+use File::Copy;
+
+our @ISA       = qw(Exporter);
+our @EXPORT_OK = qw(get_new_openssl_backend);
+
+our (@keys);
+
+INIT
+{
+	@keys = (
+		"client",     "client-revoked",
+		"client-der", "client-encrypted-pem",
+		"client-encrypted-der");
+}
+
+sub new
+{
+	my ($class) = @_;
+
+	my $self = { _library => 'OpenSSL' };
+
+	bless $self, $class;
+
+	return $self;
+}
+
+sub get_new_openssl_backend
+{
+	my $class = 'SSL::Backend::OpenSSL';
+
+	my $backend = $class->new();
+
+	return $backend;
+}
+
+sub init
+{
+	# The client's private key must not be world-readable, so take a copy
+	# of the key stored in the code tree and update its permissions.
+	#
+	# This changes ssl/client.key to ssl/client_tmp.key etc for the rest
+	# of the tests.
+	foreach my $key (@keys)
+	{
+		copy("ssl/${key}.key", "ssl/${key}_tmp.key")
+		  or die
+		  "couldn't copy ssl/${key}.key to ssl/${key}_tmp.key for permissions change: $!";
+		chmod 0600, "ssl/${key}_tmp.key"
+		  or die "failed to change permissions on ssl/${key}_tmp.key: $!";
+	}
+
+	# Also make a copy of that explicitly world-readable.  We can't
+	# necessarily rely on the file in the source tree having those
+	# permissions. Add it to @keys to include it in the final clean
+	# up phase.
+	copy("ssl/client.key", "ssl/client_wrongperms_tmp.key")
+	  or die
+	  "couldn't copy ssl/client.key to ssl/client_wrongperms_tmp.key: $!";
+	chmod 0644, "ssl/client_wrongperms_tmp.key"
+	  or die
+	  "failed to change permissions on ssl/client_wrongperms_tmp.key: $!";
+	push @keys, 'client_wrongperms';
+}
+
+# Change the configuration to use given server cert file, and reload
+# the server so that the configuration takes effect.
+sub set_server_cert
+{
+	my $self     = $_[0];
+	my $certfile = $_[1];
+	my $cafile   = $_[2] || "root+client_ca";
+	my $keyfile  = $_[3] || $certfile;
+
+	my $sslconf =
+	    "ssl_ca_file='$cafile.crt'\n"
+	  . "ssl_cert_file='$certfile.crt'\n"
+	  . "ssl_key_file='$keyfile.key'\n"
+	  . "ssl_crl_file='root+client.crl'\n";
+
+	return $sslconf;
+}
+
+sub get_library
+{
+	my ($self) = @_;
+
+	return $self->{_library};
+}
+
+sub cleanup
+{
+	foreach my $key (@keys)
+	{
+		unlink("ssl/${key}_tmp.key");
+	}
+}
+
+1;
diff --git a/src/test/ssl/t/SSLServer.pm b/src/test/ssl/t/SSL/Server.pm
similarity index 78%
rename from src/test/ssl/t/SSLServer.pm
rename to src/test/ssl/t/SSL/Server.pm
index f5987a003e..ee901855b5 100644
--- a/src/test/ssl/t/SSLServer.pm
+++ b/src/test/ssl/t/SSL/Server.pm
@@ -23,19 +23,39 @@
 # explicitly because an invalid sslcert or sslrootcert, respectively,
 # causes those to be ignored.)
 
-package SSLServer;
+package SSL::Server;
 
 use strict;
 use warnings;
 use PostgresNode;
+use RecursiveCopy;
 use TestLib;
 use File::Basename;
 use File::Copy;
 use Test::More;
+use SSL::Backend::OpenSSL qw(get_new_openssl_backend);
+use SSL::Backend::NSS qw(get_new_nss_backend);
+
+our ($openssl, $nss, $backend);
+
+# The TLS backend which the server is using should be mostly transparent for
+# the user, apart from individual configuration settings, so keep the backend
+# specific things abstracted behind SSL::Server.
+if ($ENV{with_ssl} eq 'openssl')
+{
+	$backend = get_new_openssl_backend();
+	$openssl = 1;
+}
+elsif ($ENV{with_ssl} eq 'nss')
+{
+	$backend = get_new_nss_backend();
+	$nss     = 1;
+}
 
 use Exporter 'import';
 our @EXPORT = qw(
   configure_test_server_for_ssl
+  set_server_cert
   switch_server_cert
   test_connect_fails
   test_connect_ok
@@ -144,12 +164,19 @@ sub configure_test_server_for_ssl
 	close $sslconf;
 
 	# Copy all server certificates and keys, and client root cert, to the data dir
-	copy_files("ssl/server-*.crt", $pgdata);
-	copy_files("ssl/server-*.key", $pgdata);
-	chmod(0600, glob "$pgdata/server-*.key") or die $!;
-	copy_files("ssl/root+client_ca.crt", $pgdata);
-	copy_files("ssl/root_ca.crt",        $pgdata);
-	copy_files("ssl/root+client.crl",    $pgdata);
+	if (defined($openssl))
+	{
+		copy_files("ssl/server-*.crt", $pgdata);
+		copy_files("ssl/server-*.key", $pgdata);
+		chmod(0600, glob "$pgdata/server-*.key") or die $!;
+		copy_files("ssl/root+client_ca.crt", $pgdata);
+		copy_files("ssl/root_ca.crt",        $pgdata);
+		copy_files("ssl/root+client.crl",    $pgdata);
+	}
+	elsif (defined($nss))
+	{
+		RecursiveCopy::copypath("ssl/nss", $pgdata . "/nss") if -e "ssl/nss";
+	}
 
 	# Stop and restart server to load new listen_addresses.
 	$node->restart;
@@ -157,26 +184,51 @@ sub configure_test_server_for_ssl
 	# Change pg_hba after restart because hostssl requires ssl=on
 	configure_hba_for_ssl($node, $servercidr, $authmethod);
 
+	# Finally, perform backend specific configuration
+	$backend->init();
+
 	return;
 }
 
-# Change the configuration to use given server cert file, and reload
-# the server so that the configuration takes effect.
-sub switch_server_cert
+sub ssl_library
+{
+	return $backend->get_library();
+}
+
+sub cleanup
+{
+	$backend->cleanup();
+}
+
+# Change the configuration to use given server cert file,
+sub set_server_cert
 {
 	my $node     = $_[0];
 	my $certfile = $_[1];
 	my $cafile   = $_[2] || "root+client_ca";
+	my $keyfile  = $_[3] || '';
+	my $pwcmd    = $_[4] || '';
 	my $pgdata   = $node->data_dir;
 
+	$keyfile = $certfile if $keyfile eq '';
+
 	open my $sslconf, '>', "$pgdata/sslconfig.conf";
 	print $sslconf "ssl=on\n";
-	print $sslconf "ssl_ca_file='$cafile.crt'\n";
-	print $sslconf "ssl_cert_file='$certfile.crt'\n";
-	print $sslconf "ssl_key_file='$certfile.key'\n";
-	print $sslconf "ssl_crl_file='root+client.crl'\n";
+	print $sslconf $backend->set_server_cert($certfile, $cafile, $keyfile);
+	print $sslconf "ssl_passphrase_command='$pwcmd'\n"
+	  unless $pwcmd eq '';
 	close $sslconf;
+	return;
+}
 
+# Change the configuration to use given server cert file, and reload
+# the server so that the configuration takes effect.
+# Takes the same arguments as set_server_cert, which it calls to do that
+# piece of the work.
+sub switch_server_cert
+{
+	my $node = $_[0];
+	set_server_cert(@_);
 	$node->restart;
 	return;
 }
-- 
2.21.1 (Apple Git-122.3)

From 2a534c2fe3ed673132fd8577c5c5e84583135924 Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Wed, 28 Oct 2020 11:24:02 +0100
Subject: [PATCH v19 3/5] NSS pg_strong_random support

---
 configure                   |  8 +++++++-
 configure.ac                |  5 ++++-
 src/include/pg_config.h.in  |  3 +++
 src/port/pg_strong_random.c | 40 +++++++++++++++++++++++++++++++++++++
 4 files changed, 54 insertions(+), 2 deletions(-)

diff --git a/configure b/configure
index d99ec29c6a..c15f8953ee 100755
--- a/configure
+++ b/configure
@@ -18426,6 +18426,12 @@ $as_echo "#define USE_WIN32_RANDOM 1" >>confdefs.h
 
   { $as_echo "$as_me:${as_lineno-$LINENO}: result: Windows native" >&5
 $as_echo "Windows native" >&6; }
+elif test x"$USE_NSS_RANDOM" = x"1" ; then
+
+$as_echo "#define USE_NSS_RANDOM 1" >>confdefs.h
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: NSS" >&5
+$as_echo "NSS" >&6; }
 elif test x"$USE_DEV_URANDOM" = x"1" ; then
 
 $as_echo "#define USE_DEV_URANDOM 1" >>confdefs.h
@@ -18435,7 +18441,7 @@ $as_echo "/dev/urandom" >&6; }
 else
   as_fn_error $? "
 no source of strong random numbers was found
-PostgreSQL can use OpenSSL or /dev/urandom as a source of random numbers." "$LINENO" 5
+PostgreSQL can use OpenSSL, NSS, Windows native RNG or /dev/urandom as a source of random numbers." "$LINENO" 5
 fi
 
 # If not set in template file, set bytes to use libc memset()
diff --git a/configure.ac b/configure.ac
index 7b9f4b10a3..01b0ff98b3 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2215,13 +2215,16 @@ if test x"$USE_OPENSSL_RANDOM" = x"1" ; then
 elif test x"$USE_WIN32_RANDOM" = x"1" ; then
   AC_DEFINE(USE_WIN32_RANDOM, 1, [Define to use native Windows API for random number generation])
   AC_MSG_RESULT([Windows native])
+elif test x"$USE_NSS_RANDOM" = x"1" ; then
+  AC_DEFINE(USE_NSS_RANDOM, 1, [Define to use NSS for random number generation])
+  AC_MSG_RESULT([NSS])
 elif test x"$USE_DEV_URANDOM" = x"1" ; then
   AC_DEFINE(USE_DEV_URANDOM, 1, [Define to use /dev/urandom for random number generation])
   AC_MSG_RESULT([/dev/urandom])
 else
   AC_MSG_ERROR([
 no source of strong random numbers was found
-PostgreSQL can use OpenSSL or /dev/urandom as a source of random numbers.])
+PostgreSQL can use OpenSSL, NSS, Windows native RNG or /dev/urandom as a source of random numbers.])
 fi
 
 # If not set in template file, set bytes to use libc memset()
diff --git a/src/include/pg_config.h.in b/src/include/pg_config.h.in
index 31f808398c..73c39b449c 100644
--- a/src/include/pg_config.h.in
+++ b/src/include/pg_config.h.in
@@ -896,6 +896,9 @@
 /* Define to build with NSS support (--with-nss) */
 #undef USE_NSS
 
+/* Define to use NSS for random number generation */
+#undef USE_NSS_RANDOM
+
 /* Define to 1 to use software CRC-32C implementation (slicing-by-8). */
 #undef USE_SLICING_BY_8_CRC32C
 
diff --git a/src/port/pg_strong_random.c b/src/port/pg_strong_random.c
index 6d85f50b7c..99c1d17e9a 100644
--- a/src/port/pg_strong_random.c
+++ b/src/port/pg_strong_random.c
@@ -30,6 +30,21 @@
 #ifdef USE_WIN32_RANDOM
 #include <wincrypt.h>
 #endif
+#ifdef USE_NSS_RANDOM
+#define pg_BITS_PER_BYTE BITS_PER_BYTE
+#undef BITS_PER_BYTE
+#define NO_NSPR_10_SUPPORT
+#include <nss/nss.h>
+#include <nss/pk11pub.h>
+#if defined(BITS_PER_BYTE)
+#if BITS_PER_BYTE != pg_BITS_PER_BYTE
+#error "incompatible byte widths between NSPR and postgres"
+#endif
+#else
+#define BITS_PER_BYTE pg_BITS_PER_BYTE
+#endif
+#undef pg_BITS_PER_BYTE
+#endif
 
 #ifdef USE_WIN32_RANDOM
 /*
@@ -114,6 +129,8 @@ pg_strong_random_init(void)
 #elif defined(USE_DEV_URANDOM)
 	/* no initialization needed for /dev/urandom */
 
+#elif defined(USE_NSS_RANDOM)
+	/* TODO: set up NSS context here */
 #else
 #error no source of random numbers configured
 #endif
@@ -202,6 +219,29 @@ pg_strong_random(void *buf, size_t len)
 	}
 	return false;
 
+#elif defined(USE_NSS_RANDOM)
+	NSSInitParameters params;
+	NSSInitContext *nss_context;
+	SECStatus	status;
+
+	memset(&params, 0, sizeof(params));
+	params.length = sizeof(params);
+	nss_context = NSS_InitContext("", "", "", "", &params,
+								  NSS_INIT_READONLY | NSS_INIT_NOCERTDB |
+								  NSS_INIT_NOMODDB | NSS_INIT_FORCEOPEN |
+								  NSS_INIT_NOROOTINIT | NSS_INIT_PK11RELOAD);
+
+	if (!nss_context)
+		return false;
+
+	status = PK11_GenerateRandom(buf, len);
+	NSS_ShutdownContext(nss_context);
+
+	if (status == SECSuccess)
+		return true;
+
+	return false;
+
 	/*
 	 * Read /dev/urandom ourselves.
 	 */
-- 
2.21.1 (Apple Git-122.3)

From a7944b4896ad3461f8d866e514ba8c38e9b18690 Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Wed, 28 Oct 2020 11:26:31 +0100
Subject: [PATCH v19 4/5] NSS Documentation

---
 doc/src/sgml/acronyms.sgml     | 43 +++++++++++++++++++
 doc/src/sgml/config.sgml       | 28 ++++++++++--
 doc/src/sgml/installation.sgml | 30 ++++++++++++-
 doc/src/sgml/libpq.sgml        | 27 ++++++++++--
 doc/src/sgml/runtime.sgml      | 78 ++++++++++++++++++++++++++++++++--
 5 files changed, 195 insertions(+), 11 deletions(-)

diff --git a/doc/src/sgml/acronyms.sgml b/doc/src/sgml/acronyms.sgml
index 4e5ec983c0..4f6f0cf353 100644
--- a/doc/src/sgml/acronyms.sgml
+++ b/doc/src/sgml/acronyms.sgml
@@ -441,6 +441,28 @@
     </listitem>
    </varlistentry>
 
+   <varlistentry>
+    <term><acronym>NSPR</acronym></term>
+    <listitem>
+     <para>
+      <ulink
+      url="https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSPR">
+      Netscape Portable Runtime</ulink>
+     </para>
+    </listitem>
+   </varlistentry>
+
+   <varlistentry>
+    <term><acronym>NSS</acronym></term>
+    <listitem>
+     <para>
+      <ulink
+      url="https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS">
+      Network Security Services</ulink>
+     </para>
+    </listitem>
+   </varlistentry>
+
    <varlistentry>
     <term><acronym>ODBC</acronym></term>
     <listitem>
@@ -539,6 +561,17 @@
     </listitem>
    </varlistentry>
 
+   <varlistentry>
+    <term><acronym>PKCS#12</acronym></term>
+    <listitem>
+     <para>
+      <ulink
+      url="https://en.wikipedia.org/wiki/PKCS_12">
+      Public-Key Cryptography Standards #12</ulink>
+     </para>
+    </listitem>
+   </varlistentry>
+
    <varlistentry>
     <term><acronym>PL</acronym></term>
     <listitem>
@@ -684,6 +717,16 @@
     </listitem>
    </varlistentry>
 
+   <varlistentry>
+    <term><acronym>TLS</acronym></term>
+    <listitem>
+     <para>
+      <ulink url="https://sv.wikipedia.org/wiki/Transport_Layer_Security">
+      Transport Layer Security</ulink>
+     </para>
+    </listitem>
+   </varlistentry>
+
    <varlistentry>
     <term><acronym>TOAST</acronym></term>
     <listitem>
diff --git a/doc/src/sgml/config.sgml b/doc/src/sgml/config.sgml
index f043433e31..f7ae3b1be1 100644
--- a/doc/src/sgml/config.sgml
+++ b/doc/src/sgml/config.sgml
@@ -1208,6 +1208,23 @@ include_dir 'conf.d'
       </listitem>
      </varlistentry>
 
+     <varlistentry id="guc-ssl-database" xreflabel="ssl_database">
+      <term><varname>ssl_database</varname> (<type>string</type>)
+      <indexterm>
+       <primary><varname>ssl_database</varname> configuration parameter</primary>
+      </indexterm>
+      </term>
+      <listitem>
+       <para>
+        Specifies the name of the file containing the server certificates and
+        keys when using <productname>NSS</productname> for <acronym>SSL</acronym>
+        connections. This parameter can only be set in the
+        <filename>postgresql.conf</filename> file or on the server command
+        line.
+       </para>
+      </listitem>
+     </varlistentry>
+
      <varlistentry id="guc-ssl-ciphers" xreflabel="ssl_ciphers">
       <term><varname>ssl_ciphers</varname> (<type>string</type>)
       <indexterm>
@@ -1224,7 +1241,9 @@ include_dir 'conf.d'
         connections using TLS version 1.2 and lower are affected.  There is
         currently no setting that controls the cipher choices used by TLS
         version 1.3 connections.  The default value is
-        <literal>HIGH:MEDIUM:+3DES:!aNULL</literal>.  The default is usually a
+        <literal>HIGH:MEDIUM:+3DES:!aNULL</literal> for servers which have
+        been built with <productname>OpenSSL</productname> as the
+        <acronym>SSL</acronym> library.  The default is usually a
         reasonable choice unless you have specific security requirements.
        </para>
 
@@ -1426,8 +1445,11 @@ include_dir 'conf.d'
        <para>
         Sets an external command to be invoked when a passphrase for
         decrypting an SSL file such as a private key needs to be obtained.  By
-        default, this parameter is empty, which means the built-in prompting
-        mechanism is used.
+        default, this parameter is empty. When the server is using
+        <productname>OpenSSL</productname>, this means the built-in prompting
+        mechanism is used. When using <productname>NSS</productname>, there is
+        no default prompting so a blank callback will be used returning an
+        empty password.
        </para>
        <para>
         The command must print the passphrase to the standard output and exit
diff --git a/doc/src/sgml/installation.sgml b/doc/src/sgml/installation.sgml
index 0ac1cb9999..bd09124fb0 100644
--- a/doc/src/sgml/installation.sgml
+++ b/doc/src/sgml/installation.sgml
@@ -250,7 +250,7 @@ su - postgres
 
     <listitem>
      <para>
-      You need <productname>OpenSSL</productname>, if you want to support
+      You need a supported <acronym>SSL</acronym> library, if you want to support
       encrypted client connections.  <productname>OpenSSL</productname> is
       also required for random number generation on platforms that do not
       have <filename>/dev/urandom</filename> (except Windows).  The minimum
@@ -966,6 +966,31 @@ build-postgresql:
        </listitem>
       </varlistentry>
 
+      <varlistentry>
+       <term><option>--with-nss</option>
+       <indexterm>
+        <primary>NSS</primary>
+        <secondary>NSPR</secondary>
+        <seealso>SSL</seealso>
+       </indexterm>
+       </term>
+       <listitem>
+        <para>
+         Build with support for <acronym>SSL</acronym> (encrypted)
+         connections using <productname>NSS</productname>. This requires the
+         <productname>NSS</productname> package to be installed. Additionally,
+         <productname>NSS</productname> requires <productname>NSPR</productname>
+         to be installed. <filename>configure</filename> will check for the
+         required header files and libraries to make sure that your
+         <productname>NSS</productname> installation is sufficient before
+         proceeding.
+        </para>
+        <para>
+         This option is incompatible with <literal>--with-openssl</literal>.
+        </para>
+       </listitem>
+      </varlistentry>
+
       <varlistentry>
        <term><option>--with-openssl</option>
        <indexterm>
@@ -982,6 +1007,9 @@ build-postgresql:
          your <productname>OpenSSL</productname> installation is sufficient
          before proceeding.
         </para>
+        <para>
+         This option is incompatible with <literal>--with-nss</literal>.
+        </para>
        </listitem>
       </varlistentry>
 
diff --git a/doc/src/sgml/libpq.sgml b/doc/src/sgml/libpq.sgml
index 73c6a6ea4d..e420ced087 100644
--- a/doc/src/sgml/libpq.sgml
+++ b/doc/src/sgml/libpq.sgml
@@ -2459,6 +2459,8 @@ void *PQsslStruct(const PGconn *conn, const char *struct_name);
       </para>
       <para>
        The struct(s) available depend on the SSL implementation in use.
+      </para>
+      <para>
        For <productname>OpenSSL</productname>, there is one struct,
        available under the name "OpenSSL", and it returns a pointer to the
        <productname>OpenSSL</productname> <literal>SSL</literal> struct.
@@ -2482,9 +2484,14 @@ void *PQsslStruct(const PGconn *conn, const char *struct_name);
 ]]></programlisting>
       </para>
       <para>
-       This structure can be used to verify encryption levels, check server
-       certificates, and more. Refer to the <productname>OpenSSL</productname>
-       documentation for information about this structure.
+       For <productname>NSS</productname>, there is one struct available under
+       the name "NSS", and it returns a pointer to the
+       <productname>NSS</productname> <literal>PRFileDesc</literal>.
+      </para>
+      <para>
+       These structures can be used to verify encryption levels, check server
+       certificates, and more. Refer to the <acronym>SSL</acronym> library
+       documentation for information about these structures.
       </para>
      </listitem>
     </varlistentry>
@@ -2511,6 +2518,10 @@ void *PQgetssl(const PGconn *conn);
        <xref linkend="libpq-PQsslInUse"/> instead, and for more details about the
        connection, use <xref linkend="libpq-PQsslAttribute"/>.
       </para>
+      <para>
+       This function returns <literal>NULL</literal> when <acronym>SSL</acronym>
+       librariaes other than <productname>OpenSSL</productname> are used.
+      </para>
      </listitem>
     </varlistentry>
 
@@ -7943,6 +7954,11 @@ void PQinitOpenSSL(int do_ssl, int do_crypto);
        before first opening a database connection.  Also be sure that you
        have done that initialization before opening a database connection.
       </para>
+
+      <para>
+       This function does nothing when using <productname>NSS</productname> as
+       the <acronym>SSL</acronym> library.
+      </para>
      </listitem>
     </varlistentry>
 
@@ -7969,6 +7985,11 @@ void PQinitSSL(int do_ssl);
        might be preferable for applications that need to work with older
        versions of <application>libpq</application>.
       </para>
+
+      <para>
+       This function does nothing when using <productname>NSS</productname> as
+       the <acronym>SSL</acronym> library.
+      </para>
      </listitem>
     </varlistentry>
    </variablelist>
diff --git a/doc/src/sgml/runtime.sgml b/doc/src/sgml/runtime.sgml
index 17e938148c..daa99cea74 100644
--- a/doc/src/sgml/runtime.sgml
+++ b/doc/src/sgml/runtime.sgml
@@ -2183,15 +2183,21 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
 
   <indexterm zone="ssl-tcp">
    <primary>SSL</primary>
+   <secondary>TLS</secondary>
   </indexterm>
 
   <para>
    <productname>PostgreSQL</productname> has native support for using
    <acronym>SSL</acronym> connections to encrypt client/server communications
    for increased security. This requires that
-   <productname>OpenSSL</productname> is installed on both client and
+   a supported TLS library is installed on both client and
    server systems and that support in <productname>PostgreSQL</productname> is
    enabled at build time (see <xref linkend="installation"/>).
+   Supported libraries are <productname>OpenSSL</productname> and
+   <productname>NSS</productname>. The terms <acronym>SSL</acronym> and
+   <acronym>TLS</acronym> are often used interchangeably to mean a secure
+   connection using a <acronym>TLS</acronym> protocol, even though
+   <acronym>SSL</acronym> protocols are no longer supported.
   </para>
 
   <sect2 id="ssl-setup">
@@ -2211,8 +2217,13 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
   </para>
 
   <para>
-   To start in <acronym>SSL</acronym> mode, files containing the server certificate
-   and private key must exist.  By default, these files are expected to be
+   To start in <acronym>SSL</acronym> mode, a server certificate
+   and private key must exist. The below sections on the different libraries
+   will discuss how to configure these.
+  </para>
+   
+  <para>
+   By default, these files are expected to be
    named <filename>server.crt</filename> and <filename>server.key</filename>, respectively, in
    the server's data directory, but other names and locations can be specified
    using the configuration parameters <xref linkend="guc-ssl-cert-file"/>
@@ -2302,6 +2313,18 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
   </note>
   </sect2>
 
+  <sect2 id="ssl-nss-config">
+   <title>NSS Configuration</title>
+
+  <para>
+   <productname>PostgreSQL</productname> will look for certificates and keys
+   in the <productname>NSS</productname> database specified by the parameter
+   <xref linkend="guc-ssl-database"/> in <filename>postgresql.conf</filename>.
+   The parameters for certificate and key filenames are used to identify the
+   nicknames in the database.
+  </para>
+  </sect2>
+
   <sect2 id="ssl-client-certificates">
    <title>Using Client Certificates</title>
 
@@ -2376,7 +2399,7 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
   </sect2>
 
   <sect2 id="ssl-server-files">
-   <title>SSL Server File Usage</title>
+   <title>SSL Server File Parameter Usage</title>
 
    <para>
     <xref linkend="ssl-file-usage"/> summarizes the files that are
@@ -2423,6 +2446,14 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
       <entry>client certificate must not be on this list</entry>
      </row>
 
+     <row>
+      <entry><xref linkend="guc-ssl-database"/></entry>
+      <entry>certificate database</entry>
+      <entry>contains server certificates, keys and revocation lists; only
+      used when <productname>PostgreSQL</productname> is built with support
+      for <productname>NSS</productname>.</entry>
+     </row>
+
     </tbody>
    </tgroup>
   </table>
@@ -2550,6 +2581,45 @@ openssl x509 -req -in server.csr -text -days 365 \
    </para>
   </sect2>
 
+  <sect2 id="nss-certificate-database">
+   <title>NSS Certificate Databases</title>
+
+   <para>
+    When using <productname>NSS</productname>, all certificates and keys must
+    be loaded into an <productname>NSS</productname> certificate database.
+   </para>
+
+   <para>
+    To create a new <productname>NSS</productname> certificate database and
+    load the certificates created in <xref linkend="ssl-certificate-creation" />,
+    use the following <productname>NSS</productname> commands:
+<programlisting>
+certutil -d "sql:server.db" -N --empty-password
+certutil -d "sql:server.db" -A -n server.crt -i server.crt -t "CT,C,C"
+certutil -d "sql:server.db" -A -n root.crt -i root.crt -t "CT,C,C"
+</programlisting>
+    This will give the certificate the filename as the nickname identifier in
+    the database which is created as <filename>server.db</filename>.
+   </para>
+   <para>
+    Then load the server key, which require converting it to
+    <acronym>PKCS#12</acronym> format using the
+    <productname>OpenSSL</productname> tools:
+<programlisting>
+openssl pkcs12 -export -out server.pfx -inkey server.key -in server.crt \
+  -certfile root.crt -passout pass:
+pk12util -i server.pfx -d server.db -W ''
+</programlisting>
+   </para>
+   <para>
+    Finally a certificate revocation list can be loaded with the following
+    commands:
+<programlisting>
+crlutil -I -i server.crl -d server.db -B
+</programlisting>
+   </para>
+  </sect2>
+
  </sect1>
 
  <sect1 id="gssapi-enc">
-- 
2.21.1 (Apple Git-122.3)

From b0c1a7ad03c4868e4f324c5bc72c4600a7392efb Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Wed, 28 Oct 2020 11:34:37 +0100
Subject: [PATCH v19 5/5] NSS contrib modules

---
 contrib/Makefile            |   2 +-
 contrib/pgcrypto/Makefile   |   7 +-
 contrib/pgcrypto/nss.c      | 773 ++++++++++++++++++++++++++++++++++++
 contrib/sslinfo/sslinfo.c   |  32 ++
 doc/src/sgml/pgcrypto.sgml  |  38 +-
 doc/src/sgml/sslinfo.sgml   |  12 +-
 src/tools/msvc/Install.pm   |   3 +-
 src/tools/msvc/Mkvcbuild.pm |  12 +-
 8 files changed, 864 insertions(+), 15 deletions(-)
 create mode 100644 contrib/pgcrypto/nss.c

diff --git a/contrib/Makefile b/contrib/Makefile
index 7a4866e338..c2232e5a4d 100644
--- a/contrib/Makefile
+++ b/contrib/Makefile
@@ -52,7 +52,7 @@ SUBDIRS = \
 		unaccent	\
 		vacuumlo
 
-ifeq ($(with_openssl),yes)
+ifneq ($(with_ssl),no)
 SUBDIRS += sslinfo
 else
 ALWAYS_SUBDIRS += sslinfo
diff --git a/contrib/pgcrypto/Makefile b/contrib/pgcrypto/Makefile
index 61eabd2fc0..28b54d321b 100644
--- a/contrib/pgcrypto/Makefile
+++ b/contrib/pgcrypto/Makefile
@@ -7,11 +7,14 @@ INT_TESTS = sha2
 OSSL_SRCS = openssl.c pgp-mpi-openssl.c
 OSSL_TESTS = sha2 des 3des cast5
 
+NSS_SRCS = nss.c pgp-mpi-internal.c imath.c blf.c
+NSS_TESTS = sha2 des 3des
+
 ZLIB_TST = pgp-compression
 ZLIB_OFF_TST = pgp-zlib-DISABLED
 
-CF_SRCS = $(if $(subst no,,$(with_openssl)), $(OSSL_SRCS), $(INT_SRCS))
-CF_TESTS = $(if $(subst no,,$(with_openssl)), $(OSSL_TESTS), $(INT_TESTS))
+CF_SRCS = $(if $(findstring openssl, $(with_ssl)), $(OSSL_SRCS), $(if $(findstring nss, $(with_ssl)), $(NSS_SRCS), $(INT_SRCS)))
+CF_TESTS = $(if $(findstring openssl, $(with_ssl)), $(OSSL_TESTS), $(if $(findstring nss, $(with_ssl)), $(NSS_TESTS), $(INT_TESTS)))
 CF_PGP_TESTS = $(if $(subst no,,$(with_zlib)), $(ZLIB_TST), $(ZLIB_OFF_TST))
 
 SRCS = \
diff --git a/contrib/pgcrypto/nss.c b/contrib/pgcrypto/nss.c
new file mode 100644
index 0000000000..da66152d65
--- /dev/null
+++ b/contrib/pgcrypto/nss.c
@@ -0,0 +1,773 @@
+/*-------------------------------------------------------------------------
+ *
+ * nss.c
+ *	  Wrapper for using NSS as a backend for pgcrypto PX
+ *
+ *
+ * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ *	  contrib/pgcrypto/nss.c
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#include "postgres.h"
+
+#include "px.h"
+#include "blf.h"
+#include "utils/memutils.h"
+
+/*
+ * BITS_PER_BYTE is also defined in the NSPR header files, so we need to undef
+ * our version to avoid compiler warnings on redefinition.
+ */
+#define pg_BITS_PER_BYTE BITS_PER_BYTE
+#undef BITS_PER_BYTE
+
+#include <nss/nss.h>
+#include <nss/hasht.h>
+#include <nss/pk11func.h>
+#include <nss/pk11pub.h>
+#include <nss/secitem.h>
+#include <nss/sechash.h>
+#include <nss/secoid.h>
+#include <nss/secerr.h>
+
+/*
+ * Ensure that the colliding definitions match, else throw an error. In case
+ * NSPR has removed the definition for some reason, make sure to put ours
+ * back again.
+ */
+#if defined(BITS_PER_BYTE)
+#if BITS_PER_BYTE != pg_BITS_PER_BYTE
+#error "incompatible byte widths between NSPR and postgres"
+#endif
+#else
+#define BITS_PER_BYTE pg_BITS_PER_BYTE
+#endif
+#undef pg_BITS_PER_BYTE
+
+/*
+ * Define our own mechanisms for Blowfish as it's not implemented by NSS.
+ */
+#define BLOWFISH_CBC	(1)
+#define BLOWFISH_ECB	(2)
+
+/*
+ * Data structures for recording cipher implementations as well as ongoing
+ * cipher operations.
+ */
+typedef struct nss_digest
+{
+	NSSInitContext *context;
+	PK11Context *hash_context;
+	HASH_HashType hash_type;
+}			nss_digest;
+
+typedef struct cipher_implementation
+{
+	/* Function pointers to cipher operations */
+	int			(*init) (PX_Cipher *pxc, const uint8 *key, unsigned klen, const uint8 *iv);
+	unsigned	(*get_block_size) (PX_Cipher *pxc);
+	unsigned	(*get_key_size) (PX_Cipher *pxc);
+	unsigned	(*get_iv_size) (PX_Cipher *pxc);
+	int			(*encrypt) (PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res);
+	int			(*decrypt) (PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res);
+	void		(*free) (PX_Cipher *pxc);
+
+	/* The mechanism describing the cipher used */
+	union
+	{
+		CK_MECHANISM_TYPE nss;
+		CK_ULONG	internal;
+	}			mechanism;
+	int			keylen;
+	bool		is_nss;
+}			cipher_implementation;
+
+typedef struct nss_cipher
+{
+	const cipher_implementation *impl;
+	NSSInitContext *context;
+	PK11Context *crypt_context;
+	SECItem    *params;
+
+	PK11SymKey *encrypt_key;
+	PK11SymKey *decrypt_key;
+}			nss_cipher;
+
+typedef struct internal_cipher
+{
+	const cipher_implementation *impl;
+	BlowfishContext context;
+}			internal_cipher;
+
+typedef struct nss_cipher_ref
+{
+	const char *name;
+	const cipher_implementation *impl;
+}			nss_cipher_ref;
+
+/*
+ * Prototypes
+ */
+static unsigned nss_get_iv_size(PX_Cipher *pxc);
+static unsigned nss_get_block_size(PX_Cipher *pxc);
+
+/*
+ * nss_GetHashOidTagByHashType
+ *
+ * Returns the corresponding SECOidTag for the passed hash type. NSS 3.43
+ * includes HASH_GetHashOidTagByHashType for this purpose, but at the time of
+ * writing is not commonly available so we need our own version till then.
+ */
+static SECOidTag
+nss_GetHashOidTagByHashType(HASH_HashType type)
+{
+	if (type == HASH_AlgMD2)
+		return SEC_OID_MD2;
+	if (type == HASH_AlgMD5)
+		return SEC_OID_MD5;
+	if (type == HASH_AlgSHA1)
+		return SEC_OID_SHA1;
+	if (type == HASH_AlgSHA224)
+		return SEC_OID_SHA224;
+	if (type == HASH_AlgSHA256)
+		return SEC_OID_SHA256;
+	if (type == HASH_AlgSHA384)
+		return SEC_OID_SHA384;
+	if (type == HASH_AlgSHA512)
+		return SEC_OID_SHA512;
+
+	return SEC_OID_UNKNOWN;
+}
+
+static unsigned
+nss_digest_block_size(PX_MD *pxmd)
+{
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+	const SECHashObject *object;
+
+	object = HASH_GetHashObject(digest->hash_type);
+	return object->blocklength;
+}
+
+static unsigned
+nss_digest_result_size(PX_MD *pxmd)
+{
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+	const SECHashObject *object;
+
+	object = HASH_GetHashObject(digest->hash_type);
+	return object->length;
+}
+
+static void
+nss_digest_free(PX_MD *pxmd)
+{
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+	PRBool		free_ctx = PR_TRUE;
+
+	PK11_DestroyContext(digest->hash_context, free_ctx);
+	NSS_ShutdownContext(digest->context);
+}
+
+static void
+nss_digest_update(PX_MD *pxmd, const uint8 *data, unsigned dlen)
+{
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+
+	PK11_DigestOp(digest->hash_context, data, dlen);
+}
+
+static void
+nss_digest_reset(PX_MD *pxmd)
+{
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+
+	PK11_DigestBegin(digest->hash_context);
+}
+
+static void
+nss_digest_finish(PX_MD *pxmd, uint8 *dst)
+{
+	unsigned int outlen;
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+	const SECHashObject *object;
+
+	object = HASH_GetHashObject(digest->hash_type);
+	PK11_DigestFinal(digest->hash_context, dst, &outlen, object->length);
+}
+
+int
+px_find_digest(const char *name, PX_MD **res)
+{
+	PX_MD	   *pxmd;
+	NSSInitParameters params;
+	NSSInitContext *nss_context;
+	bool		found = false;
+	nss_digest *digest;
+	SECStatus	status;
+	SECOidData *hash;
+	HASH_HashType t;
+
+	/*
+	 * Initialize our own NSS context without a database backing it.
+	 */
+	memset(&params, 0, sizeof(params));
+	params.length = sizeof(params);
+	nss_context = NSS_InitContext("", "", "", "", &params,
+								  NSS_INIT_READONLY | NSS_INIT_NOCERTDB |
+								  NSS_INIT_NOMODDB | NSS_INIT_FORCEOPEN |
+								  NSS_INIT_NOROOTINIT | NSS_INIT_PK11RELOAD);
+
+	/*
+	 * There is no API function for looking up a digest algorithm from a name
+	 * string, but there is a publicly accessible array which can be scanned
+	 * for the name.
+	 */
+	for (t = HASH_AlgNULL + 1; t < HASH_AlgTOTAL; t++)
+	{
+		SECOidTag	hash_oid;
+		char	   *p;
+
+		hash_oid = nss_GetHashOidTagByHashType(t);
+
+		if (hash_oid == SEC_OID_UNKNOWN)
+			return PXE_NO_HASH;
+
+		hash = SECOID_FindOIDByTag(hash_oid);
+		if (pg_strcasecmp(hash->desc, name) == 0)
+		{
+			found = true;
+			break;
+		}
+
+		/*
+		 * NSS saves the algorithm names using SHA-xxx notation whereas
+		 * OpenSSL use SHAxxx. To make sure the user finds the requested
+		 * algorithm let's remove the dash and compare that spelling as well.
+		 */
+		if ((p = strchr(hash->desc, '-')) != NULL)
+		{
+			char		tmp[12];
+
+			memcpy(tmp, hash->desc, p - hash->desc);
+			memcpy(tmp + (p - hash->desc), p + 1, strlen(hash->desc) - (p - hash->desc) + 1);
+			if (pg_strcasecmp(tmp, name) == 0)
+			{
+				found = true;
+				break;
+			}
+		}
+	}
+
+	if (!found)
+		return PXE_NO_HASH;
+
+	digest = palloc(sizeof(*digest));
+
+	digest->context = nss_context;
+	digest->hash_context = PK11_CreateDigestContext(hash->offset);
+	digest->hash_type = t;
+	if (digest->hash_context == NULL)
+	{
+		pfree(digest);
+		return -1;
+	}
+
+	status = PK11_DigestBegin(digest->hash_context);
+	if (status != SECSuccess)
+	{
+		PK11_DestroyContext(digest->hash_context, PR_TRUE);
+		pfree(digest);
+		return -1;
+	}
+
+	pxmd = palloc(sizeof(*pxmd));
+	pxmd->result_size = nss_digest_result_size;
+	pxmd->block_size = nss_digest_block_size;
+	pxmd->reset = nss_digest_reset;
+	pxmd->update = nss_digest_update;
+	pxmd->finish = nss_digest_finish;
+	pxmd->free = nss_digest_free;
+	pxmd->p.ptr = (void *) digest;
+
+	*res = pxmd;
+
+	return 0;
+}
+
+static int
+bf_init(PX_Cipher *pxc, const uint8 *key, unsigned klen, const uint8 *iv)
+{
+	internal_cipher *cipher = (internal_cipher *) pxc->ptr;
+
+	blowfish_setkey(&cipher->context, key, klen);
+	if (iv)
+		blowfish_setiv(&cipher->context, iv);
+
+	return 0;
+}
+
+static int
+bf_encrypt(PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res)
+{
+	internal_cipher *cipher = (internal_cipher *) pxc->ptr;
+	uint8	   *buf;
+
+	if (dlen == 0)
+		return 0;
+
+	if (dlen & 7)
+		return PXE_NOTBLOCKSIZE;
+
+	buf = palloc(dlen);
+	memcpy(buf, data, dlen);
+
+	if (cipher->impl->mechanism.internal == BLOWFISH_ECB)
+		blowfish_encrypt_ecb(buf, dlen, &cipher->context);
+	else
+		blowfish_encrypt_cbc(buf, dlen, &cipher->context);
+
+	memcpy(res, buf, dlen);
+	pfree(buf);
+
+	return 0;
+}
+
+static int
+bf_decrypt(PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res)
+{
+	internal_cipher *cipher = (internal_cipher *) pxc->ptr;
+
+	if (dlen == 0)
+		return 0;
+
+	if (dlen & 7)
+		return PXE_NOTBLOCKSIZE;
+
+	memcpy(res, data, dlen);
+	if (cipher->impl->mechanism.internal == BLOWFISH_ECB)
+		blowfish_decrypt_ecb(res, dlen, &cipher->context);
+	else
+		blowfish_decrypt_cbc(res, dlen, &cipher->context);
+
+	return 0;
+}
+
+static void
+bf_free(PX_Cipher *pxc)
+{
+	internal_cipher *cipher = (internal_cipher *) pxc->ptr;
+
+	pfree(cipher);
+	pfree(pxc);
+}
+
+static int
+nss_symkey_blockcipher_init(PX_Cipher *pxc, const uint8 *key, unsigned klen,
+							const uint8 *iv)
+{
+	nss_cipher *cipher = (nss_cipher *) pxc->ptr;
+	SECItem		iv_item;
+	unsigned char *iv_item_data;
+	SECItem		key_item;
+	int			keylen;
+	PK11SlotInfo *slot;
+
+	if (cipher->impl->mechanism.nss == CKM_AES_CBC ||
+		cipher->impl->mechanism.nss == CKM_AES_ECB)
+	{
+		if (klen <= 128 / 8)
+			keylen = 128 / 8;
+		else if (klen <= 192 / 8)
+			keylen = 192 / 8;
+		else if (klen <= 256 / 8)
+			keylen = 256 / 8;
+		else
+			return PXE_CIPHER_INIT;
+	}
+	else
+		keylen = cipher->impl->keylen;
+
+	key_item.type = siBuffer;
+	key_item.data = (unsigned char *) key;
+	key_item.len = keylen;
+
+	/*
+	 * If hardware acceleration is configured in NSS one can theoretically get
+	 * a better slot by calling PK11_GetBestSlot() with the mechanism passed
+	 * to it. Unless there are complaints, using the simpler API will make
+	 * error handling easier though.
+	 */
+	slot = PK11_GetInternalSlot();
+	if (!slot)
+		return PXE_CIPHER_INIT;
+
+	/*
+	 * The key must be set up for the operation, and since we don't know at
+	 * this point whether we are asked to encrypt or decrypt we need to store
+	 * both versions.
+	 */
+	cipher->decrypt_key = PK11_ImportSymKey(slot, cipher->impl->mechanism.nss,
+											PK11_OriginUnwrap,
+											CKA_DECRYPT, &key_item,
+											NULL);
+	cipher->encrypt_key = PK11_ImportSymKey(slot, cipher->impl->mechanism.nss,
+											PK11_OriginUnwrap,
+											CKA_ENCRYPT, &key_item,
+											NULL);
+	PK11_FreeSlot(slot);
+
+	if (!cipher->decrypt_key || !cipher->encrypt_key)
+		return PXE_CIPHER_INIT;
+
+	if (iv)
+	{
+		iv_item.type = siBuffer;
+		iv_item.data = (unsigned char *) iv;
+		iv_item.len = nss_get_iv_size(pxc);
+	}
+	else
+	{
+		/*
+		 * The documentation states that either passing .data = 0; .len = 0;
+		 * in the iv_item, or NULL as iv_item, to PK11_ParamFromIV should be
+		 * done when IV is missing. That however leads to segfaults in the
+		 * library, the workaround that works in modern  library versions is
+		 * to pass in a keysized zeroed out IV.
+		 */
+		iv_item_data = palloc0(nss_get_iv_size(pxc));
+		iv_item.type = siBuffer;
+		iv_item.data = iv_item_data;
+		iv_item.len = nss_get_iv_size(pxc);
+	}
+
+	cipher->params = PK11_ParamFromIV(cipher->impl->mechanism.nss, &iv_item);
+
+	/* If we had to make a mock IV, free it once made into a param */
+	if (!iv)
+		pfree(iv_item_data);
+
+	if (cipher->params == NULL)
+		return PXE_CIPHER_INIT;
+
+	return 0;
+}
+
+static int
+nss_decrypt(PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res)
+{
+	nss_cipher *cipher = (nss_cipher *) pxc->ptr;
+	SECStatus	status;
+	int			outlen;
+
+	if (!cipher->crypt_context)
+	{
+		cipher->crypt_context =
+			PK11_CreateContextBySymKey(cipher->impl->mechanism.nss, CKA_DECRYPT,
+									   cipher->decrypt_key, cipher->params);
+	}
+
+	status = PK11_CipherOp(cipher->crypt_context, res, &outlen, dlen, data, dlen);
+	if (status != SECSuccess)
+		return PXE_DECRYPT_FAILED;
+
+	return 0;
+}
+
+static int
+nss_encrypt(PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res)
+{
+	nss_cipher *cipher = (nss_cipher *) pxc->ptr;
+	SECStatus	status;
+	int			outlen;
+
+	if (!cipher->crypt_context)
+	{
+		cipher->crypt_context =
+			PK11_CreateContextBySymKey(cipher->impl->mechanism.nss, CKA_ENCRYPT,
+									   cipher->decrypt_key, cipher->params);
+	}
+
+	status = PK11_CipherOp(cipher->crypt_context, res, &outlen, dlen, data, dlen);
+
+	if (status != SECSuccess)
+		return PXE_DECRYPT_FAILED;
+
+	return 0;
+}
+
+static void
+nss_free(PX_Cipher *pxc)
+{
+	nss_cipher *cipher = pxc->ptr;
+	PRBool		free_ctx = PR_TRUE;
+
+	PK11_FreeSymKey(cipher->encrypt_key);
+	PK11_FreeSymKey(cipher->decrypt_key);
+	PK11_DestroyContext(cipher->crypt_context, free_ctx);
+	NSS_ShutdownContext(cipher->context);
+	pfree(cipher);
+
+	pfree(pxc);
+}
+
+static unsigned
+nss_get_block_size(PX_Cipher *pxc)
+{
+	nss_cipher *cipher = pxc->ptr;
+
+	return PK11_GetBlockSize(cipher->impl->mechanism.nss, NULL);
+}
+
+static unsigned
+nss_get_key_size(PX_Cipher *pxc)
+{
+	nss_cipher *cipher = pxc->ptr;
+
+	return cipher->impl->keylen;
+}
+
+static unsigned
+nss_get_iv_size(PX_Cipher *pxc)
+{
+	nss_cipher *cipher = pxc->ptr;
+
+	return PK11_GetIVLength(cipher->impl->mechanism.nss);
+}
+
+static unsigned
+bf_get_block_size(PX_Cipher *pxc)
+{
+	return 8;
+}
+
+static unsigned
+bf_get_key_size(PX_Cipher *pxc)
+{
+	return 448 / 8;
+}
+
+static unsigned
+bf_get_iv_size(PX_Cipher *pxc)
+{
+	return 8;
+}
+
+/*
+ * Cipher Implementations
+ */
+static const cipher_implementation nss_des_cbc = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_DES_CBC,
+	.keylen = 8,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_des_ecb = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_DES_ECB,
+	.keylen = 8,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_des3_cbc = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_DES3_CBC,
+	.keylen = 24,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_des3_ecb = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_DES3_ECB,
+	.keylen = 24,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_aes_cbc = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_AES_CBC,
+	.keylen = 32,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_aes_ecb = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_AES_ECB,
+	.keylen = 32,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_bf_ecb = {
+	.init = bf_init,
+	.get_block_size = bf_get_block_size,
+	.get_key_size = bf_get_key_size,
+	.get_iv_size = bf_get_iv_size,
+	.encrypt = bf_encrypt,
+	.decrypt = bf_decrypt,
+	.free = bf_free,
+	.mechanism.internal = BLOWFISH_ECB,
+	.keylen = 56,
+	.is_nss = false
+};
+
+static const cipher_implementation nss_bf_cbc = {
+	.init = bf_init,
+	.get_block_size = bf_get_block_size,
+	.get_key_size = bf_get_key_size,
+	.get_iv_size = bf_get_iv_size,
+	.encrypt = bf_encrypt,
+	.decrypt = bf_decrypt,
+	.free = bf_free,
+	.mechanism.internal = BLOWFISH_CBC,
+	.keylen = 56,
+	.is_nss = false
+};
+
+/*
+ * Lookup table for finding the implementation based on a name. CAST5 as well
+ * as BLOWFISH are defined as cipher mechanisms in NSS but error out with
+ * SEC_ERROR_INVALID_ALGORITHM. Blowfish is implemented using the internal
+ * implementation while CAST5 isn't supported at all at this time,
+ */
+static const nss_cipher_ref nss_cipher_lookup[] = {
+	{"des", &nss_des_cbc},
+	{"des-cbc", &nss_des_cbc},
+	{"des-ecb", &nss_des_ecb},
+	{"des3-cbc", &nss_des3_cbc},
+	{"3des", &nss_des3_cbc},
+	{"3des-cbc", &nss_des3_cbc},
+	{"des3-ecb", &nss_des3_ecb},
+	{"3des-ecb", &nss_des3_ecb},
+	{"aes", &nss_aes_cbc},
+	{"aes-cbc", &nss_aes_cbc},
+	{"aes-ecb", &nss_aes_ecb},
+	{"rijndael", &nss_aes_cbc},
+	{"rijndael-cbc", &nss_aes_cbc},
+	{"rijndael-ecb", &nss_aes_ecb},
+	{"blowfish", &nss_bf_cbc},
+	{"blowfish-cbc", &nss_bf_cbc},
+	{"blowfish-ecb", &nss_bf_ecb},
+	{"bf", &nss_bf_cbc},
+	{"bf-cbc", &nss_bf_cbc},
+	{"bf-ecb", &nss_bf_ecb},
+	{NULL}
+};
+
+/*
+ * px_find_cipher
+ *
+ * Search for the requested cipher and see if there is support for it, and if
+ * so return an allocated object containing the playbook for how to encrypt
+ * and decrypt using the cipher.
+ */
+int
+px_find_cipher(const char *alias, PX_Cipher **res)
+{
+	const nss_cipher_ref *cipher_ref;
+	PX_Cipher  *px_cipher;
+	NSSInitParameters params;
+	NSSInitContext *nss_context;
+	nss_cipher *cipher;
+	internal_cipher *int_cipher;
+
+	for (cipher_ref = nss_cipher_lookup; cipher_ref->name; cipher_ref++)
+	{
+		if (strcmp(cipher_ref->name, alias) == 0)
+			break;
+	}
+
+	if (!cipher_ref->name)
+		return PXE_NO_CIPHER;
+
+	/*
+	 * Fill in the PX_Cipher to pass back to PX describing the operations to
+	 * perform in order to use the cipher.
+	 */
+	px_cipher = palloc(sizeof(*px_cipher));
+	px_cipher->block_size = cipher_ref->impl->get_block_size;
+	px_cipher->key_size = cipher_ref->impl->get_key_size;
+	px_cipher->iv_size = cipher_ref->impl->get_iv_size;
+	px_cipher->free = cipher_ref->impl->free;
+	px_cipher->init = cipher_ref->impl->init;
+	px_cipher->encrypt = cipher_ref->impl->encrypt;
+	px_cipher->decrypt = cipher_ref->impl->decrypt;
+
+	/*
+	 * Set the private data, which is different for NSS and internal ciphers
+	 */
+	if (cipher_ref->impl->is_nss)
+	{
+		/*
+		 * Initialize our own NSS context without a database backing it. At
+		 * some point we might want to allow users to use stored keys in the
+		 * database rather than passing them via SELECT encrypt(), and then
+		 * this need to be changed to open a user specified database.
+		 */
+		memset(&params, 0, sizeof(params));
+		params.length = sizeof(params);
+		nss_context = NSS_InitContext("", "", "", "", &params,
+									  NSS_INIT_READONLY | NSS_INIT_NOCERTDB |
+									  NSS_INIT_NOMODDB | NSS_INIT_FORCEOPEN |
+									  NSS_INIT_NOROOTINIT | NSS_INIT_PK11RELOAD);
+
+		/* nss_cipher is the private state struct for the operation */
+		cipher = palloc(sizeof(*cipher));
+		cipher->context = nss_context;
+		cipher->impl = cipher_ref->impl;
+		cipher->crypt_context = NULL;
+
+		px_cipher->ptr = cipher;
+	}
+	else
+	{
+		int_cipher = palloc0(sizeof(*int_cipher));
+
+		int_cipher->impl = cipher_ref->impl;
+		px_cipher->ptr = int_cipher;
+	}
+
+	*res = px_cipher;
+	return 0;
+}
diff --git a/contrib/sslinfo/sslinfo.c b/contrib/sslinfo/sslinfo.c
index 30cae0bb98..3aadd90aa6 100644
--- a/contrib/sslinfo/sslinfo.c
+++ b/contrib/sslinfo/sslinfo.c
@@ -9,9 +9,11 @@
 
 #include "postgres.h"
 
+#ifdef USE_OPENSSL
 #include <openssl/x509.h>
 #include <openssl/x509v3.h>
 #include <openssl/asn1.h>
+#endif
 
 #include "access/htup_details.h"
 #include "funcapi.h"
@@ -21,6 +23,7 @@
 
 PG_MODULE_MAGIC;
 
+#ifdef USE_OPENSSL
 static Datum X509_NAME_field_to_text(X509_NAME *name, text *fieldName);
 static Datum ASN1_STRING_to_text(ASN1_STRING *str);
 
@@ -31,6 +34,7 @@ typedef struct
 {
 	TupleDesc	tupdesc;
 } SSLExtensionInfoContext;
+#endif
 
 /*
  * Indicates whether current session uses SSL
@@ -131,6 +135,7 @@ ssl_client_serial(PG_FUNCTION_ARGS)
 }
 
 
+#ifdef USE_OPENSSL
 /*
  * Converts OpenSSL ASN1_STRING structure into text
  *
@@ -282,7 +287,23 @@ ssl_issuer_field(PG_FUNCTION_ARGS)
 	else
 		return result;
 }
+#endif							/* USE_OPENSSL */
 
+#ifdef USE_NSS
+PG_FUNCTION_INFO_V1(ssl_client_dn_field);
+Datum
+ssl_client_dn_field(PG_FUNCTION_ARGS)
+{
+	PG_RETURN_NULL();
+}
+
+PG_FUNCTION_INFO_V1(ssl_issuer_field);
+Datum
+ssl_issuer_field(PG_FUNCTION_ARGS)
+{
+	PG_RETURN_NULL();
+}
+#endif							/* USE_NSS */
 
 /*
  * Returns current client certificate subject as one string
@@ -338,6 +359,7 @@ ssl_issuer_dn(PG_FUNCTION_ARGS)
 }
 
 
+#ifdef USE_OPENSSL
 /*
  * Returns information about available SSL extensions.
  *
@@ -471,3 +493,13 @@ ssl_extension_info(PG_FUNCTION_ARGS)
 	/* All done */
 	SRF_RETURN_DONE(funcctx);
 }
+#endif							/* USE_OPENSSL */
+
+#ifdef USE_NSS
+PG_FUNCTION_INFO_V1(ssl_extension_info);
+Datum
+ssl_extension_info(PG_FUNCTION_ARGS)
+{
+	PG_RETURN_NULL();
+}
+#endif							/* USE_NSS */
diff --git a/doc/src/sgml/pgcrypto.sgml b/doc/src/sgml/pgcrypto.sgml
index 8748c64e2d..f03e1f5fcf 100644
--- a/doc/src/sgml/pgcrypto.sgml
+++ b/doc/src/sgml/pgcrypto.sgml
@@ -45,8 +45,9 @@ digest(data bytea, type text) returns bytea
     <literal>sha224</literal>, <literal>sha256</literal>,
     <literal>sha384</literal> and <literal>sha512</literal>.
     If <filename>pgcrypto</filename> was built with
-    <productname>OpenSSL</productname>, more algorithms are available, as
-    detailed in <xref linkend="pgcrypto-with-without-openssl"/>.
+    <productname>OpenSSL</productname> or <productname>NSS</productname>,
+    more algorithms are available, as
+    detailed in <xref linkend="pgcrypto-with-without-openssl-nss"/>.
    </para>
 
    <para>
@@ -763,7 +764,7 @@ pgp_sym_encrypt(data, psw, 'compress-algo=1, cipher-algo=aes256')
     Which cipher algorithm to use.
    </para>
 <literallayout>
-Values: bf, aes128, aes192, aes256 (OpenSSL-only: <literal>3des</literal>, <literal>cast5</literal>)
+Values: bf, aes128, aes192, aes256 (OpenSSL-only: <literal>3des</literal>, <literal>cast5</literal>; NSS-only: <literal>3des</literal>)
 Default: aes128
 Applies to: pgp_sym_encrypt, pgp_pub_encrypt
 </literallayout>
@@ -1152,8 +1153,8 @@ gen_random_uuid() returns uuid
    <para>
     <filename>pgcrypto</filename> configures itself according to the findings of the
     main PostgreSQL <literal>configure</literal> script.  The options that
-    affect it are <literal>--with-zlib</literal> and
-    <literal>--with-openssl</literal>.
+    affect it are <literal>--with-zlib</literal>,
+    <literal>--with-openssl</literal> and <literal>--with-nss</literal>.
    </para>
 
    <para>
@@ -1168,14 +1169,16 @@ gen_random_uuid() returns uuid
     BIGNUM functions.
    </para>
 
-   <table id="pgcrypto-with-without-openssl">
-    <title>Summary of Functionality with and without OpenSSL</title>
-    <tgroup cols="3">
+   <table id="pgcrypto-with-without-openssl-nss">
+    <title>Summary of Functionality with and without external cryptographic
+      library</title>
+    <tgroup cols="4">
      <thead>
       <row>
        <entry>Functionality</entry>
        <entry>Built-in</entry>
        <entry>With OpenSSL</entry>
+       <entry>With NSS</entry>
       </row>
      </thead>
      <tbody>
@@ -1183,51 +1186,67 @@ gen_random_uuid() returns uuid
        <entry>MD5</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>SHA1</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>SHA224/256/384/512</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>Other digest algorithms</entry>
        <entry>no</entry>
        <entry>yes (Note 1)</entry>
+       <entry>yes (Note 1)</entry>
       </row>
       <row>
        <entry>Blowfish</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>AES</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>DES/3DES/CAST5</entry>
        <entry>no</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
+      </row>
+      <row>
+       <entry>CAST5</entry>
+       <entry>no</entry>
+       <entry>yes</entry>
+       <entry>no</entry>
       </row>
       <row>
        <entry>Raw encryption</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>PGP Symmetric encryption</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>PGP Public-Key encryption</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
      </tbody>
     </tgroup>
@@ -1240,7 +1259,8 @@ gen_random_uuid() returns uuid
    <orderedlist>
     <listitem>
      <para>
-      Any digest algorithm <productname>OpenSSL</productname> supports
+      Any digest algorithm <productname>OpenSSL</productname> and
+      <productname>NSS</productname> supports
       is automatically picked up.
       This is not possible with ciphers, which need to be supported
       explicitly.
diff --git a/doc/src/sgml/sslinfo.sgml b/doc/src/sgml/sslinfo.sgml
index 3213c039ca..d2270cbe7c 100644
--- a/doc/src/sgml/sslinfo.sgml
+++ b/doc/src/sgml/sslinfo.sgml
@@ -22,7 +22,8 @@
 
  <para>
   This extension won't build at all unless the installation was
-  configured with <literal>--with-openssl</literal>.
+  configured with SSL support, such as <literal>--with-openssl</literal>
+  or <literal>--with-nss</literal>.
  </para>
 
  <sect2>
@@ -208,6 +209,9 @@ emailAddress
      the X.500 and X.509 standards, so you cannot just assign arbitrary
      meaning to them.
     </para>
+    <para>
+     This function is only available when using <productname>OpenSSL</productname>.
+    </para>
     </listitem>
    </varlistentry>
 
@@ -223,6 +227,9 @@ emailAddress
      Same as <function>ssl_client_dn_field</function>, but for the certificate issuer
      rather than the certificate subject.
     </para>
+    <para>
+     This function is only available when using <productname>OpenSSL</productname>.
+    </para>
     </listitem>
    </varlistentry>
 
@@ -238,6 +245,9 @@ emailAddress
      Provide information about extensions of client certificate: extension name,
      extension value, and if it is a critical extension.
     </para>
+    <para>
+     This function is only available when using <productname>OpenSSL</productname>.
+    </para>
     </listitem>
    </varlistentry>
   </variablelist>
diff --git a/src/tools/msvc/Install.pm b/src/tools/msvc/Install.pm
index ea3af48777..afe72a7e97 100644
--- a/src/tools/msvc/Install.pm
+++ b/src/tools/msvc/Install.pm
@@ -438,7 +438,8 @@ sub CopyContribFiles
 		{
 			# These configuration-based exclusions must match vcregress.pl
 			next if ($d eq "uuid-ossp"  && !defined($config->{uuid}));
-			next if ($d eq "sslinfo"    && !defined($config->{openssl}));
+			next if ($d eq "sslinfo"    && !defined($config->{openssl})
+			  && !defined($config->{nss}));
 			next if ($d eq "xml2"       && !defined($config->{xml}));
 			next if ($d =~ /_plperl$/   && !defined($config->{perl}));
 			next if ($d =~ /_plpython$/ && !defined($config->{python}));
diff --git a/src/tools/msvc/Mkvcbuild.pm b/src/tools/msvc/Mkvcbuild.pm
index 29879b51af..379f861a56 100644
--- a/src/tools/msvc/Mkvcbuild.pm
+++ b/src/tools/msvc/Mkvcbuild.pm
@@ -442,9 +442,14 @@ sub mkvcbuild
 		push @contrib_excludes, 'xml2';
 	}
 
+	if (!$solution->{options}->{openssl} && !$solution->{options}->{nss})
+	{
+		push @contrib_excludes, 'sslinfo';
+	}
+
 	if (!$solution->{options}->{openssl})
 	{
-		push @contrib_excludes, 'sslinfo', 'ssl_passphrase_callback';
+		push @contrib_excludes, 'ssl_passphrase_callback';
 	}
 
 	if (!$solution->{options}->{uuid})
@@ -474,6 +479,11 @@ sub mkvcbuild
 		$pgcrypto->AddFiles('contrib/pgcrypto', 'openssl.c',
 			'pgp-mpi-openssl.c');
 	}
+	elsif ($solution->{options}->{nss})
+	{
+		$pgcrypto->AddFiles('contrib/pgcrypto', 'nss.c',
+			'pgp-mpi-internal.c', 'imath.c', 'blf.c');
+	}
 	else
 	{
 		$pgcrypto->AddFiles(
-- 
2.21.1 (Apple Git-122.3)

From 2f1d58f9c376429ca3ff84d0489824603d2bcd52 Mon Sep 17 00:00:00 2001
From: Jacob Champion <pchampion@vmware.com>
Date: Mon, 16 Nov 2020 08:55:33 -0800
Subject: [PATCH] nss: fix hang when hashing certificates

---
 src/backend/libpq/be-secure-nss.c    | 19 ++++++++++++-------
 src/interfaces/libpq/fe-secure-nss.c | 22 ++++++++++++++++------
 2 files changed, 28 insertions(+), 13 deletions(-)

diff --git a/src/backend/libpq/be-secure-nss.c b/src/backend/libpq/be-secure-nss.c
index e7540c4756..b1982ee596 100644
--- a/src/backend/libpq/be-secure-nss.c
+++ b/src/backend/libpq/be-secure-nss.c
@@ -813,6 +813,7 @@ be_tls_get_certificate_hash(Port *port, size_t *len)
 	SECOidTag	signature_alg;
 	SECOidTag	digest_alg;
 	int			digest_len;
+	const NSSSignatureAlgorithms *candidate;
 	SECStatus	status;
 	PLArenaPool *arena = NULL;
 	SECItem		digest;
@@ -824,20 +825,24 @@ be_tls_get_certificate_hash(Port *port, size_t *len)
 		return NULL;
 
 	signature_alg = SECOID_GetAlgorithmTag(&certificate->signature);
-	/* Set sha-256 as a default */
-	digest_alg = SEC_OID_SHA256;
-	digest_len = SHA256_LENGTH;
 
-	while (NSS_SCRAMDigestAlgorithm->signature)
+	candidate = NSS_SCRAMDigestAlgorithm;
+	while (candidate->signature)
 	{
-		if (signature_alg == NSS_SCRAMDigestAlgorithm->signature)
+		if (signature_alg == candidate->signature)
 		{
-			digest_alg = NSS_SCRAMDigestAlgorithm->hash;
-			digest_len = NSS_SCRAMDigestAlgorithm->len;
+			digest_alg = candidate->hash;
+			digest_len = candidate->len;
 			break;
 		}
+
+		candidate++;
 	}
 
+	if (!candidate->signature)
+		elog(ERROR, "could not find digest for OID '%s'",
+			 SECOID_FindOIDTagDescription(signature_alg));
+
 	arena = PORT_NewArena(SEC_ASN1_DEFAULT_ARENA_SIZE);
 	digest.data = PORT_ArenaZAlloc(arena, sizeof(unsigned char) * digest_len);
 	digest.len = digest_len;
diff --git a/src/interfaces/libpq/fe-secure-nss.c b/src/interfaces/libpq/fe-secure-nss.c
index 787bc140a6..2f10e94f72 100644
--- a/src/interfaces/libpq/fe-secure-nss.c
+++ b/src/interfaces/libpq/fe-secure-nss.c
@@ -540,6 +540,7 @@ pgtls_get_peer_certificate_hash(PGconn *conn, size_t *len)
 	SECOidTag	signature_alg;
 	SECOidTag	digest_alg;
 	int			digest_len;
+	const NSSSignatureAlgorithms *candidate;
 	PLArenaPool *arena;
 	SECItem		digest;
 	char	   *ret;
@@ -552,17 +553,26 @@ pgtls_get_peer_certificate_hash(PGconn *conn, size_t *len)
 		return NULL;
 
 	signature_alg = SECOID_GetAlgorithmTag(&server_cert->signature);
-	digest_alg = SEC_OID_SHA256;
-	digest_len = SHA256_LENGTH;
 
-	while (NSS_SCRAMDigestAlgorithm->signature)
+	candidate = NSS_SCRAMDigestAlgorithm;
+	while (candidate->signature)
 	{
-		if (signature_alg == NSS_SCRAMDigestAlgorithm->signature)
+		if (signature_alg == candidate->signature)
 		{
-			digest_alg = NSS_SCRAMDigestAlgorithm->hash;
-			digest_len = NSS_SCRAMDigestAlgorithm->len;
+			digest_alg = candidate->hash;
+			digest_len = candidate->len;
 			break;
 		}
+
+		candidate++;
+	}
+
+	if (!candidate->signature)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("could not find digest for OID '%s'\n"),
+						  SECOID_FindOIDTagDescription(signature_alg));
+		return NULL;
 	}
 
 	arena = PORT_NewArena(SEC_ASN1_DEFAULT_ARENA_SIZE);
-- 
2.24.1

From af799b72951a9dca3823bbd496af86b026fa3978 Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Wed, 28 Oct 2020 11:18:42 +0100
Subject: [PATCH v20 1/5] NSS Frontend, Backend and build infrastructure

TODO:
	* SCRAM channel binding is implemented but doesn't work
	* Frontend CRL configuration handling
	* Settle on a required version in autoconf
	* Move pg_nss.h to a .c file for both frontend and backend

Daniel Gustafsson, Andrew Dunstan, Jacob Champion
---
 configure                                     |  401 +++++-
 configure.ac                                  |   60 +-
 .../postgres_fdw/expected/postgres_fdw.out    |    2 +-
 src/Makefile.global.in                        |    2 +-
 src/backend/libpq/Makefile                    |    6 +-
 src/backend/libpq/auth.c                      |    7 +
 src/backend/libpq/be-secure-nss.c             | 1211 +++++++++++++++++
 src/backend/libpq/be-secure.c                 |    3 +
 src/backend/libpq/hba.c                       |    2 +-
 src/backend/utils/misc/guc.c                  |   20 +-
 src/common/Makefile                           |    2 +-
 src/include/common/pg_nss.h                   |  175 +++
 src/include/libpq/libpq-be.h                  |   15 +-
 src/include/libpq/libpq.h                     |    3 +
 src/include/pg_config.h.in                    |    3 +
 src/include/pg_config_manual.h                |    5 +-
 src/interfaces/libpq/Makefile                 |   13 +-
 src/interfaces/libpq/fe-connect.c             |    4 +
 src/interfaces/libpq/fe-secure-nss.c          | 1105 +++++++++++++++
 src/interfaces/libpq/fe-secure.c              |    5 +-
 src/interfaces/libpq/libpq-fe.h               |   11 +
 src/interfaces/libpq/libpq-int.h              |   20 +-
 src/tools/msvc/Mkvcbuild.pm                   |   22 +-
 src/tools/msvc/Solution.pm                    |   20 +
 src/tools/msvc/config_default.pl              |    1 +
 25 files changed, 3045 insertions(+), 73 deletions(-)
 create mode 100644 src/backend/libpq/be-secure-nss.c
 create mode 100644 src/include/common/pg_nss.h
 create mode 100644 src/interfaces/libpq/fe-secure-nss.c

diff --git a/configure b/configure
index ace4ed5dec..d99ec29c6a 100755
--- a/configure
+++ b/configure
@@ -654,6 +654,9 @@ LIBOBJS
 UUID_LIBS
 LDAP_LIBS_BE
 LDAP_LIBS_FE
+with_ssl
+NSPR_CONFIG
+NSS_CONFIG
 PTHREAD_CFLAGS
 PTHREAD_LIBS
 PTHREAD_CC
@@ -711,7 +714,6 @@ with_uuid
 with_readline
 with_systemd
 with_selinux
-with_openssl
 with_ldap
 with_krb_srvnam
 krb_srvtab
@@ -856,7 +858,6 @@ with_pam
 with_bsd_auth
 with_ldap
 with_bonjour
-with_openssl
 with_selinux
 with_systemd
 with_readline
@@ -868,6 +869,8 @@ with_libxslt
 with_system_tzdata
 with_zlib
 with_gnu_ld
+with_ssl
+with_openssl
 enable_largefile
 '
       ac_precious_vars='build_alias
@@ -1558,7 +1561,6 @@ Optional Packages:
   --with-bsd-auth         build with BSD Authentication support
   --with-ldap             build with LDAP support
   --with-bonjour          build with Bonjour support
-  --with-openssl          build with OpenSSL support
   --with-selinux          build with SELinux support
   --with-systemd          build with systemd support
   --without-readline      do not use GNU Readline nor BSD Libedit for editing
@@ -1572,6 +1574,8 @@ Optional Packages:
                           use system time zone data in DIR
   --without-zlib          do not use Zlib
   --with-gnu-ld           assume the C compiler uses GNU ld [default=no]
+  --with-ssl=LIB          use LIB for SSL/TLS support (openssl, nss)
+  --with-openssl          obsolete spelling of --with-ssl=openssl
 
 Some influential environment variables:
   CC          C compiler command
@@ -8071,41 +8075,6 @@ fi
 $as_echo "$with_bonjour" >&6; }
 
 
-#
-# OpenSSL
-#
-{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether to build with OpenSSL support" >&5
-$as_echo_n "checking whether to build with OpenSSL support... " >&6; }
-
-
-
-# Check whether --with-openssl was given.
-if test "${with_openssl+set}" = set; then :
-  withval=$with_openssl;
-  case $withval in
-    yes)
-
-$as_echo "#define USE_OPENSSL 1" >>confdefs.h
-
-      ;;
-    no)
-      :
-      ;;
-    *)
-      as_fn_error $? "no argument expected for --with-openssl option" "$LINENO" 5
-      ;;
-  esac
-
-else
-  with_openssl=no
-
-fi
-
-
-{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $with_openssl" >&5
-$as_echo "$with_openssl" >&6; }
-
-
 #
 # SELinux
 #
@@ -12179,7 +12148,64 @@ fi
   fi
 fi
 
+#
+# SSL Library
+#
+# There are currently two supported SSL/TLS libraries, OpenSSL and NSS.
+#
+
+
+
+# Check whether --with-ssl was given.
+if test "${with_ssl+set}" = set; then :
+  withval=$with_ssl;
+  case $withval in
+    yes)
+      as_fn_error $? "argument required for --with-ssl option" "$LINENO" 5
+      ;;
+    no)
+      as_fn_error $? "argument required for --with-ssl option" "$LINENO" 5
+      ;;
+    *)
+
+      ;;
+  esac
+
+fi
+
+
+if test x"$with_ssl" = x"" ; then
+  with_ssl=no
+fi
+
+
+
+# Check whether --with-openssl was given.
+if test "${with_openssl+set}" = set; then :
+  withval=$with_openssl;
+  case $withval in
+    yes)
+      :
+      ;;
+    no)
+      :
+      ;;
+    *)
+      as_fn_error $? "no argument expected for --with-openssl option" "$LINENO" 5
+      ;;
+  esac
+
+else
+  with_openssl=no
+
+fi
+
+
 if test "$with_openssl" = yes ; then
+  with_ssl=openssl
+fi
+
+if test "$with_ssl" = openssl ; then
     # Minimum required OpenSSL version is 1.0.1
 
 $as_echo "#define OPENSSL_API_COMPAT 0x10001000L" >>confdefs.h
@@ -12440,8 +12466,280 @@ _ACEOF
 fi
 done
 
+
+$as_echo "#define USE_OPENSSL 1" >>confdefs.h
+
+elif test "$with_ssl" = nss ; then
+  # TODO: fallback in case nss-config/nspr-config aren't found.
+  if test -z "$NSS_CONFIG"; then
+  for ac_prog in nss-config
+do
+  # Extract the first word of "$ac_prog", so it can be a program name with args.
+set dummy $ac_prog; ac_word=$2
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
+$as_echo_n "checking for $ac_word... " >&6; }
+if ${ac_cv_path_NSS_CONFIG+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  case $NSS_CONFIG in
+  [\\/]* | ?:[\\/]*)
+  ac_cv_path_NSS_CONFIG="$NSS_CONFIG" # Let the user override the test with a path.
+  ;;
+  *)
+  as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH
+do
+  IFS=$as_save_IFS
+  test -z "$as_dir" && as_dir=.
+    for ac_exec_ext in '' $ac_executable_extensions; do
+  if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
+    ac_cv_path_NSS_CONFIG="$as_dir/$ac_word$ac_exec_ext"
+    $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
+    break 2
+  fi
+done
+  done
+IFS=$as_save_IFS
+
+  ;;
+esac
+fi
+NSS_CONFIG=$ac_cv_path_NSS_CONFIG
+if test -n "$NSS_CONFIG"; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $NSS_CONFIG" >&5
+$as_echo "$NSS_CONFIG" >&6; }
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
 fi
 
+
+  test -n "$NSS_CONFIG" && break
+done
+
+else
+  # Report the value of NSS_CONFIG in configure's output in all cases.
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for NSS_CONFIG" >&5
+$as_echo_n "checking for NSS_CONFIG... " >&6; }
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $NSS_CONFIG" >&5
+$as_echo "$NSS_CONFIG" >&6; }
+fi
+
+  if test -z "$NSPR_CONFIG"; then
+  for ac_prog in nspr-config
+do
+  # Extract the first word of "$ac_prog", so it can be a program name with args.
+set dummy $ac_prog; ac_word=$2
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
+$as_echo_n "checking for $ac_word... " >&6; }
+if ${ac_cv_path_NSPR_CONFIG+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  case $NSPR_CONFIG in
+  [\\/]* | ?:[\\/]*)
+  ac_cv_path_NSPR_CONFIG="$NSPR_CONFIG" # Let the user override the test with a path.
+  ;;
+  *)
+  as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH
+do
+  IFS=$as_save_IFS
+  test -z "$as_dir" && as_dir=.
+    for ac_exec_ext in '' $ac_executable_extensions; do
+  if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
+    ac_cv_path_NSPR_CONFIG="$as_dir/$ac_word$ac_exec_ext"
+    $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
+    break 2
+  fi
+done
+  done
+IFS=$as_save_IFS
+
+  ;;
+esac
+fi
+NSPR_CONFIG=$ac_cv_path_NSPR_CONFIG
+if test -n "$NSPR_CONFIG"; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $NSPR_CONFIG" >&5
+$as_echo "$NSPR_CONFIG" >&6; }
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+fi
+
+
+  test -n "$NSPR_CONFIG" && break
+done
+
+else
+  # Report the value of NSPR_CONFIG in configure's output in all cases.
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for NSPR_CONFIG" >&5
+$as_echo_n "checking for NSPR_CONFIG... " >&6; }
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $NSPR_CONFIG" >&5
+$as_echo "$NSPR_CONFIG" >&6; }
+fi
+
+  if test -n "$NSS_CONFIG"; then
+    NSS_LIBS=`$NSS_CONFIG --libs`
+	NSS_CFLAGS=`$NSS_CONFIG --cflags`
+  fi
+  if test -n "$NSPR_CONFIG"; then
+	NSPR_LIBS=`$NSPR_CONFIG --libs`
+	NSPR_CFLAGS=`$NSPR_CONFIG --cflags`
+  fi
+
+  LDFLAGS="$LDFLAGS $NSS_LIBS $NSPR_LIBS"
+  CFLAGS="$CFLAGS $NSS_CFLAGS $NSPR_CFLAGS"
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for NSS_InitContext in -lnss3" >&5
+$as_echo_n "checking for NSS_InitContext in -lnss3... " >&6; }
+if ${ac_cv_lib_nss3_NSS_InitContext+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lnss3  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char NSS_InitContext ();
+int
+main ()
+{
+return NSS_InitContext ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_lib_nss3_NSS_InitContext=yes
+else
+  ac_cv_lib_nss3_NSS_InitContext=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_nss3_NSS_InitContext" >&5
+$as_echo "$ac_cv_lib_nss3_NSS_InitContext" >&6; }
+if test "x$ac_cv_lib_nss3_NSS_InitContext" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_LIBNSS3 1
+_ACEOF
+
+  LIBS="-lnss3 $LIBS"
+
+else
+  as_fn_error $? "library 'nss3' is required for NSS" "$LINENO" 5
+fi
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for PR_GetDefaultIOMethods in -lnspr4" >&5
+$as_echo_n "checking for PR_GetDefaultIOMethods in -lnspr4... " >&6; }
+if ${ac_cv_lib_nspr4_PR_GetDefaultIOMethods+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lnspr4  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char PR_GetDefaultIOMethods ();
+int
+main ()
+{
+return PR_GetDefaultIOMethods ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_lib_nspr4_PR_GetDefaultIOMethods=yes
+else
+  ac_cv_lib_nspr4_PR_GetDefaultIOMethods=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_nspr4_PR_GetDefaultIOMethods" >&5
+$as_echo "$ac_cv_lib_nspr4_PR_GetDefaultIOMethods" >&6; }
+if test "x$ac_cv_lib_nspr4_PR_GetDefaultIOMethods" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_LIBNSPR4 1
+_ACEOF
+
+  LIBS="-lnspr4 $LIBS"
+
+else
+  as_fn_error $? "library 'nspr4' is required for NSS" "$LINENO" 5
+fi
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for SSL_GetImplementedCiphers in -lssl3" >&5
+$as_echo_n "checking for SSL_GetImplementedCiphers in -lssl3... " >&6; }
+if ${ac_cv_lib_ssl3_SSL_GetImplementedCiphers+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lssl3  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char SSL_GetImplementedCiphers ();
+int
+main ()
+{
+return SSL_GetImplementedCiphers ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_lib_ssl3_SSL_GetImplementedCiphers=yes
+else
+  ac_cv_lib_ssl3_SSL_GetImplementedCiphers=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_ssl3_SSL_GetImplementedCiphers" >&5
+$as_echo "$ac_cv_lib_ssl3_SSL_GetImplementedCiphers" >&6; }
+if test "x$ac_cv_lib_ssl3_SSL_GetImplementedCiphers" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_LIBSSL3 1
+_ACEOF
+
+  LIBS="-lssl3 $LIBS"
+
+else
+  as_fn_error $? "library 'ssl3' is required for NSS" "$LINENO" 5
+fi
+
+
+$as_echo "#define USE_NSS 1" >>confdefs.h
+
+elif test "$with_ssl" != no ; then
+  as_fn_error $? "--with-ssl must specify one of openssl or nss" "$LINENO" 5
+fi
+
+
 if test "$with_pam" = yes ; then
   { $as_echo "$as_me:${as_lineno-$LINENO}: checking for pam_start in -lpam" >&5
 $as_echo_n "checking for pam_start in -lpam... " >&6; }
@@ -13327,7 +13625,7 @@ done
 
 fi
 
-if test "$with_openssl" = yes ; then
+if test "$with_ssl" = openssl ; then
   ac_fn_c_check_header_mongrel "$LINENO" "openssl/ssl.h" "ac_cv_header_openssl_ssl_h" "$ac_includes_default"
 if test "x$ac_cv_header_openssl_ssl_h" = xyes; then :
 
@@ -13344,6 +13642,25 @@ else
 fi
 
 
+fi
+
+if test "$with_ssl" = nss ; then
+  ac_fn_c_check_header_mongrel "$LINENO" "nss/ssl.h" "ac_cv_header_nss_ssl_h" "$ac_includes_default"
+if test "x$ac_cv_header_nss_ssl_h" = xyes; then :
+
+else
+  as_fn_error $? "header file <nss/ssl.h> is required for NSS" "$LINENO" 5
+fi
+
+
+  ac_fn_c_check_header_mongrel "$LINENO" "nss/nss.h" "ac_cv_header_nss_nss_h" "$ac_includes_default"
+if test "x$ac_cv_header_nss_nss_h" = xyes; then :
+
+else
+  as_fn_error $? "header file <nss/nss.h> is required for NSS" "$LINENO" 5
+fi
+
+
 fi
 
 if test "$with_pam" = yes ; then
@@ -18061,11 +18378,13 @@ fi
 # in the template or configure command line.
 
 # If not selected manually, try to select a source automatically.
-if test x"$USE_OPENSSL_RANDOM" = x"" && test x"$USE_WIN32_RANDOM" = x"" && test x"$USE_DEV_URANDOM" = x"" ; then
-  if test x"$with_openssl" = x"yes" ; then
+if test x"$USE_OPENSSL_RANDOM" = x"" && test x"$USE_WIN32_RANDOM" = x"" && test x"$USE_DEV_URANDOM" = x"" && test x"$USE_NSS_RANDOM" = x"" ; then
+  if test x"$with_ssl" = x"openssl" ; then
     USE_OPENSSL_RANDOM=1
   elif test "$PORTNAME" = "win32" ; then
     USE_WIN32_RANDOM=1
+  elif test x"$with_ssl" = x"nss" ; then
+    USE_NSS_RANDOM=1
   else
     { $as_echo "$as_me:${as_lineno-$LINENO}: checking for /dev/urandom" >&5
 $as_echo_n "checking for /dev/urandom... " >&6; }
diff --git a/configure.ac b/configure.ac
index 5b91c83fd0..7b9f4b10a3 100644
--- a/configure.ac
+++ b/configure.ac
@@ -852,15 +852,6 @@ PGAC_ARG_BOOL(with, bonjour, no,
 AC_MSG_RESULT([$with_bonjour])
 
 
-#
-# OpenSSL
-#
-AC_MSG_CHECKING([whether to build with OpenSSL support])
-PGAC_ARG_BOOL(with, openssl, no, [build with OpenSSL support],
-              [AC_DEFINE([USE_OPENSSL], 1, [Define to build with OpenSSL support. (--with-openssl)])])
-AC_MSG_RESULT([$with_openssl])
-AC_SUBST(with_openssl)
-
 #
 # SELinux
 #
@@ -1209,7 +1200,21 @@ if test "$with_gssapi" = yes ; then
   fi
 fi
 
+#
+# SSL Library
+#
+# There are currently two supported SSL/TLS libraries, OpenSSL and NSS.
+#
+PGAC_ARG_REQ(with, ssl, [LIB], [use LIB for SSL/TLS support (openssl, nss)])
+if test x"$with_ssl" = x"" ; then
+  with_ssl=no
+fi
+PGAC_ARG_BOOL(with, openssl, no, [obsolete spelling of --with-ssl=openssl])
 if test "$with_openssl" = yes ; then
+  with_ssl=openssl
+fi
+
+if test "$with_ssl" = openssl ; then
   dnl Order matters!
   # Minimum required OpenSSL version is 1.0.1
   AC_DEFINE(OPENSSL_API_COMPAT, [0x10001000L],
@@ -1233,7 +1238,31 @@ if test "$with_openssl" = yes ; then
   # thread-safety. In 1.1.0, it's no longer required, and CRYPTO_lock()
   # function was removed.
   AC_CHECK_FUNCS([CRYPTO_lock])
+  AC_DEFINE([USE_OPENSSL], 1, [Define to 1 if you have OpenSSL support.])
+elif test "$with_ssl" = nss ; then
+  # TODO: fallback in case nss-config/nspr-config aren't found.
+  PGAC_PATH_PROGS(NSS_CONFIG, nss-config)
+  PGAC_PATH_PROGS(NSPR_CONFIG, nspr-config)
+  if test -n "$NSS_CONFIG"; then
+    NSS_LIBS=`$NSS_CONFIG --libs`
+	NSS_CFLAGS=`$NSS_CONFIG --cflags`
+  fi
+  if test -n "$NSPR_CONFIG"; then
+	NSPR_LIBS=`$NSPR_CONFIG --libs`
+	NSPR_CFLAGS=`$NSPR_CONFIG --cflags`
+  fi
+
+  LDFLAGS="$LDFLAGS $NSS_LIBS $NSPR_LIBS"
+  CFLAGS="$CFLAGS $NSS_CFLAGS $NSPR_CFLAGS"
+
+  AC_CHECK_LIB(nss3, NSS_InitContext, [], [AC_MSG_ERROR([library 'nss3' is required for NSS])])
+  AC_CHECK_LIB(nspr4, PR_GetDefaultIOMethods, [], [AC_MSG_ERROR([library 'nspr4' is required for NSS])])
+  AC_CHECK_LIB(ssl3, SSL_GetImplementedCiphers, [], [AC_MSG_ERROR([library 'ssl3' is required for NSS])])
+  AC_DEFINE([USE_NSS], 1, [Define to 1 if you have NSS support,])
+elif test "$with_ssl" != no ; then
+  AC_MSG_ERROR([--with-ssl must specify one of openssl or nss])
 fi
+AC_SUBST(with_ssl)
 
 if test "$with_pam" = yes ; then
   AC_CHECK_LIB(pam,    pam_start, [], [AC_MSG_ERROR([library 'pam' is required for PAM])])
@@ -1405,11 +1434,16 @@ if test "$with_gssapi" = yes ; then
 	[AC_CHECK_HEADERS(gssapi.h, [], [AC_MSG_ERROR([gssapi.h header file is required for GSSAPI])])])
 fi
 
-if test "$with_openssl" = yes ; then
+if test "$with_ssl" = openssl ; then
   AC_CHECK_HEADER(openssl/ssl.h, [], [AC_MSG_ERROR([header file <openssl/ssl.h> is required for OpenSSL])])
   AC_CHECK_HEADER(openssl/err.h, [], [AC_MSG_ERROR([header file <openssl/err.h> is required for OpenSSL])])
 fi
 
+if test "$with_ssl" = nss ; then
+  AC_CHECK_HEADER(nss/ssl.h, [], [AC_MSG_ERROR([header file <nss/ssl.h> is required for NSS])])
+  AC_CHECK_HEADER(nss/nss.h, [], [AC_MSG_ERROR([header file <nss/nss.h> is required for NSS])])
+fi
+
 if test "$with_pam" = yes ; then
   AC_CHECK_HEADERS(security/pam_appl.h, [],
                    [AC_CHECK_HEADERS(pam/pam_appl.h, [],
@@ -2158,11 +2192,13 @@ fi
 # in the template or configure command line.
 
 # If not selected manually, try to select a source automatically.
-if test x"$USE_OPENSSL_RANDOM" = x"" && test x"$USE_WIN32_RANDOM" = x"" && test x"$USE_DEV_URANDOM" = x"" ; then
-  if test x"$with_openssl" = x"yes" ; then
+if test x"$USE_OPENSSL_RANDOM" = x"" && test x"$USE_WIN32_RANDOM" = x"" && test x"$USE_DEV_URANDOM" = x"" && test x"$USE_NSS_RANDOM" = x"" ; then
+  if test x"$with_ssl" = x"openssl" ; then
     USE_OPENSSL_RANDOM=1
   elif test "$PORTNAME" = "win32" ; then
     USE_WIN32_RANDOM=1
+  elif test x"$with_ssl" = x"nss" ; then
+    USE_NSS_RANDOM=1
   else
     AC_CHECK_FILE([/dev/urandom], [], [])
 
diff --git a/contrib/postgres_fdw/expected/postgres_fdw.out b/contrib/postgres_fdw/expected/postgres_fdw.out
index 2d88d06358..984efc0d7e 100644
--- a/contrib/postgres_fdw/expected/postgres_fdw.out
+++ b/contrib/postgres_fdw/expected/postgres_fdw.out
@@ -8911,7 +8911,7 @@ DO $d$
     END;
 $d$;
 ERROR:  invalid option "password"
-HINT:  Valid options in this context are: service, passfile, channel_binding, connect_timeout, dbname, host, hostaddr, port, options, application_name, keepalives, keepalives_idle, keepalives_interval, keepalives_count, tcp_user_timeout, sslmode, sslcompression, sslcert, sslkey, sslrootcert, sslcrl, requirepeer, ssl_min_protocol_version, ssl_max_protocol_version, gssencmode, krbsrvname, gsslib, target_session_attrs, use_remote_estimate, fdw_startup_cost, fdw_tuple_cost, extensions, updatable, fetch_size
+HINT:  Valid options in this context are: service, passfile, channel_binding, connect_timeout, dbname, host, hostaddr, port, options, application_name, keepalives, keepalives_idle, keepalives_interval, keepalives_count, tcp_user_timeout, sslmode, sslcompression, sslcert, sslkey, sslrootcert, sslcrl, requirepeer, ssl_min_protocol_version, ssl_max_protocol_version, gssencmode, krbsrvname, gsslib, target_session_attrs, cert_database, use_remote_estimate, fdw_startup_cost, fdw_tuple_cost, extensions, updatable, fetch_size
 CONTEXT:  SQL statement "ALTER SERVER loopback_nopw OPTIONS (ADD password 'dummypw')"
 PL/pgSQL function inline_code_block line 3 at EXECUTE
 -- If we add a password for our user mapping instead, we should get a different
diff --git a/src/Makefile.global.in b/src/Makefile.global.in
index 7ca1e9aac5..bdab2a6825 100644
--- a/src/Makefile.global.in
+++ b/src/Makefile.global.in
@@ -183,7 +183,7 @@ with_icu	= @with_icu@
 with_perl	= @with_perl@
 with_python	= @with_python@
 with_tcl	= @with_tcl@
-with_openssl	= @with_openssl@
+with_ssl	= @with_ssl@
 with_readline	= @with_readline@
 with_selinux	= @with_selinux@
 with_systemd	= @with_systemd@
diff --git a/src/backend/libpq/Makefile b/src/backend/libpq/Makefile
index efc5ef760a..045d2c2f6b 100644
--- a/src/backend/libpq/Makefile
+++ b/src/backend/libpq/Makefile
@@ -28,8 +28,12 @@ OBJS = \
 	pqmq.o \
 	pqsignal.o
 
-ifeq ($(with_openssl),yes)
+ifeq ($(with_ssl),openssl)
 OBJS += be-secure-openssl.o
+else
+ifeq ($(with_ssl),nss)
+OBJS += be-secure-nss.o
+endif
 endif
 
 ifeq ($(with_gssapi),yes)
diff --git a/src/backend/libpq/auth.c b/src/backend/libpq/auth.c
index d132c5cb48..d476101583 100644
--- a/src/backend/libpq/auth.c
+++ b/src/backend/libpq/auth.c
@@ -2870,7 +2870,14 @@ CheckCertAuth(Port *port)
 {
 	int			status_check_usermap = STATUS_ERROR;
 
+#if defined(USE_OPENSSL)
 	Assert(port->ssl);
+#elif defined(USE_NSS)
+	/* TODO: should we rename pr_fd to ssl, to keep consistency? */
+	Assert(port->pr_fd);
+#else
+	Assert(false);
+#endif
 
 	/* Make sure we have received a username in the certificate */
 	if (port->peer_cn == NULL ||
diff --git a/src/backend/libpq/be-secure-nss.c b/src/backend/libpq/be-secure-nss.c
new file mode 100644
index 0000000000..54d4047cc2
--- /dev/null
+++ b/src/backend/libpq/be-secure-nss.c
@@ -0,0 +1,1211 @@
+/*-------------------------------------------------------------------------
+ *
+ * be-secure-nss.c
+ *	  functions for supporting NSS as a TLS backend
+ *
+ *
+ * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ *	  src/backend/libpq/be-secure-nss.c
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#include "postgres.h"
+
+#include <sys/stat.h>
+
+/*
+ * BITS_PER_BYTE is also defined in the NSPR header files, so we need to undef
+ * our version to avoid compiler warnings on redefinition.
+ */
+#define pg_BITS_PER_BYTE BITS_PER_BYTE
+#undef BITS_PER_BYTE
+
+/*
+ * The nspr/obsolete/protypes.h NSPR header typedefs uint64 and int64 with
+ * colliding definitions from ours, causing a much expected compiler error.
+ * Remove backwards compatibility with ancient NSPR versions to avoid this.
+ */
+#define NO_NSPR_10_SUPPORT
+#include <nspr/nspr.h>
+#include <nspr/prerror.h>
+#include <nspr/prio.h>
+#include <nspr/prmem.h>
+#include <nspr/prtypes.h>
+
+#include <nss/nss.h>
+#include <nss/base64.h>
+#include <nss/cert.h>
+#include <nss/certdb.h>
+#include <nss/hasht.h>
+#include <nss/keyhi.h>
+#include <nss/pk11pub.h>
+#include <nss/secder.h>
+#include <nss/secerr.h>
+#include <nss/secitem.h>
+#include <nss/secoidt.h>
+#include <nss/secport.h>
+#include <nss/ssl.h>
+#include <nss/sslerr.h>
+#include <nss/sslproto.h>
+
+/*
+ * Ensure that the colliding definitions match, else throw an error. In case
+ * NSPR has removed the definition for some reason, make sure to put ours
+ * back again.
+ */
+#if defined(BITS_PER_BYTE)
+#if BITS_PER_BYTE != pg_BITS_PER_BYTE
+#error "incompatible byte widths between NSPR and postgres"
+#endif
+#else
+#define BITS_PER_BYTE pg_BITS_PER_BYTE
+#endif
+#undef pg_BITS_PER_BYTE
+
+#include "common/pg_nss.h"
+#include "lib/stringinfo.h"
+#include "libpq/libpq.h"
+#include "nodes/pg_list.h"
+#include "miscadmin.h"
+#include "storage/fd.h"
+#include "utils/guc.h"
+#include "utils/memutils.h"
+
+
+/* default init hook can be overridden by a shared library */
+static void default_nss_tls_init(bool isServerStart);
+nss_tls_init_hook_type nss_tls_init_hook = default_nss_tls_init;
+
+static PRDescIdentity pr_id;
+
+static PRIOMethods pr_iomethods;
+static NSSInitContext * nss_context = NULL;
+static SSLVersionRange desired_sslver;
+
+static char *external_ssl_passphrase_cb(PK11SlotInfo *slot, PRBool retry, void *arg);
+static bool dummy_ssl_passwd_cb_called = false;
+static bool ssl_is_server_start;
+
+/*
+ * PR_ImportTCPSocket() is a private API, but very widely used, as it's the
+ * only way to make NSS use an already set up POSIX file descriptor rather
+ * than opening one itself. To quote the NSS documentation:
+ *
+ *		"In theory, code that uses PR_ImportTCPSocket may break when NSPR's
+ *		implementation changes. In practice, this is unlikely to happen because
+ *		NSPR's implementation has been stable for years and because of NSPR's
+ *		strong commitment to backward compatibility."
+ *
+ * https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSPR/Reference/PR_ImportTCPSocket
+ *
+ * The function is declared in <private/pprio.h>, but as it is a header marked
+ * private we declare it here rather than including it.
+ */
+NSPR_API(PRFileDesc *) PR_ImportTCPSocket(int);
+
+/* NSS IO layer callback overrides */
+static PRInt32 pg_ssl_read(PRFileDesc * fd, void *buf, PRInt32 amount,
+						   PRIntn flags, PRIntervalTime timeout);
+static PRInt32 pg_ssl_write(PRFileDesc * fd, const void *buf, PRInt32 amount,
+							PRIntn flags, PRIntervalTime timeout);
+static PRStatus pg_ssl_close(PRFileDesc * fd);
+/* Utility functions */
+static PRFileDesc * init_iolayer(Port *port);
+static uint16 ssl_protocol_version_to_nss(int v, const char *guc_name);
+
+static char *pg_SSLerrmessage(PRErrorCode errcode);
+static char *ssl_protocol_version_to_string(int v);
+static SECStatus pg_cert_auth_handler(void *arg, PRFileDesc * fd,
+									  PRBool checksig, PRBool isServer);
+static SECStatus pg_bad_cert_handler(void *arg, PRFileDesc * fd);
+static char *dummy_ssl_passphrase_cb(PK11SlotInfo * slot, PRBool retry, void *arg);
+
+/* ------------------------------------------------------------ */
+/*						 Public interface						*/
+/* ------------------------------------------------------------ */
+
+/*
+ * be_tls_init
+ *			Initialize the nss TLS library in the postmaster
+ *
+ * The majority of the setup needs to happen in be_tls_open_server since the
+ * NSPR initialization must happen after the forking of the backend. We could
+ * potentially move some parts in under !isServerStart, but so far this is the
+ * separation chosen.
+ */
+int
+be_tls_init(bool isServerStart)
+{
+	SECStatus	status;
+	SSLVersionRange supported_sslver;
+
+	status = SSL_ConfigServerSessionIDCacheWithOpt(0, 0, NULL, 1, 0, 0, PR_FALSE);
+	if (status != SECSuccess)
+	{
+		ereport(isServerStart ? FATAL : LOG,
+				(errmsg("unable to connect to TLS connection cache: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+		return -1;
+	}
+
+	if (!ssl_database || strlen(ssl_database) == 0)
+	{
+		ereport(isServerStart ? FATAL : LOG,
+				(errmsg("no certificate database specified")));
+		return -1;
+	}
+
+	/*
+	 * We check for the desired TLS version range here, even though we cannot
+	 * set it until be_open_server such that we can be compatible with how the
+	 * OpenSSL backend reports errors for incompatible range configurations.
+	 * Set either the default supported TLS version range, or the configured
+	 * range from ssl_min_protocol_version and ssl_max_protocol version. In
+	 * case the user hasn't defined the maximum allowed version we fall back
+	 * to the highest version TLS that the library supports.
+	 */
+	if (SSL_VersionRangeGetSupported(ssl_variant_stream, &supported_sslver) != SECSuccess)
+	{
+		ereport(isServerStart ? FATAL : LOG,
+				(errmsg("unable to get default protocol support from NSS")));
+		return -1;
+	}
+
+	/*
+	 * Set the fallback versions for the TLS protocol version range to a
+	 * combination of our minimal requirement and the library maximum.
+	 */
+	desired_sslver.min = SSL_LIBRARY_VERSION_TLS_1_0;
+	desired_sslver.max = supported_sslver.max;
+
+	if (ssl_min_protocol_version)
+	{
+		int			ver = ssl_protocol_version_to_nss(ssl_min_protocol_version,
+													  "ssl_min_protocol_version");
+
+		if (ver == -1)
+		{
+			ereport(isServerStart ? FATAL : LOG,
+					(errmsg("\"%s\" setting \"%s\" not supported by this build",
+							"ssl_min_protocol_version",
+							GetConfigOption("ssl_min_protocol_version",
+											false, false))));
+			return -1;
+		}
+
+		if (ver > 0)
+			desired_sslver.min = ver;
+	}
+
+	if (ssl_max_protocol_version)
+	{
+		int			ver = ssl_protocol_version_to_nss(ssl_max_protocol_version,
+													  "ssl_max_protocol_version");
+
+		if (ver == -1)
+		{
+			ereport(isServerStart ? FATAL : LOG,
+					(errmsg("\"%s\" setting \"%s\" not supported by this build",
+							"ssl_max_protocol_version",
+							GetConfigOption("ssl_max_protocol_version",
+											false, false))));
+			return -1;
+		}
+		if (ver > 0)
+			desired_sslver.max = ver;
+
+		if (ver < desired_sslver.min)
+		{
+			ereport(isServerStart ? FATAL : LOG,
+					(errmsg("could not set SSL protocol version range"),
+					 errdetail("\"%s\" cannot be higher than \"%s\"",
+							   "ssl_min_protocol_version",
+							   "ssl_max_protocol_version")));
+			return -1;
+		}
+	}
+
+	/*
+	 * Set the passphrase callback which will be used both to obtain the
+	 * passphrase from the user, as well as by NSS to obtain the phrase
+	 * repeatedly.
+	 */
+	ssl_is_server_start = isServerStart;
+	(*nss_tls_init_hook) (isServerStart);
+
+	return 0;
+}
+
+int
+be_tls_open_server(Port *port)
+{
+	SECStatus	status;
+	PRFileDesc *model;
+	PRFileDesc *pr_fd;
+	PRFileDesc *layer;
+	CERTCertificate *server_cert;
+	SECKEYPrivateKey *private_key;
+	CERTSignedCrl *crl;
+	SECItem		crlname;
+	char	   *cert_database;
+	NSSInitParameters params;
+
+	/*
+	 * The NSPR documentation states that runtime initialization via PR_Init
+	 * is no longer required, as the first caller into NSPR will perform the
+	 * initialization implicitly. The documentation doesn't however clarify
+	 * from which version this is holds true, so let's perform the potentially
+	 * superfluous initialization anyways to avoid crashing on older versions
+	 * of NSPR, as there is no difference in overhead.  The NSS documentation
+	 * still states that PR_Init must be called in some way (implicitly or
+	 * explicitly).
+	 *
+	 * The below parameters are what the implicit initialization would've done
+	 * for us, and should work even for older versions where it might not be
+	 * done automatically. The last parameter, maxPTDs, is set to various
+	 * values in other codebases, but has been unused since NSPR 2.1 which was
+	 * released sometime in 1998. In current versions of NSPR all parameters
+	 * are ignored.
+	 */
+	PR_Init(PR_USER_THREAD, PR_PRIORITY_NORMAL, 0 /* maxPTDs */ );
+
+	/*
+	 * The certificate path (configdir) must contain a valid NSS database. If
+	 * the certificate path isn't a valid directory, NSS will fall back on the
+	 * system certificate database. If the certificate path is a directory but
+	 * is empty then the initialization will fail. On the client side this can
+	 * be allowed for any sslmode but the verify-xxx ones.
+	 * https://bugzilla.redhat.com/show_bug.cgi?id=728562 For the server side
+	 * we won't allow this to fail however, as we require the certificate and
+	 * key to exist.
+	 *
+	 * The original design of NSS was for a single application to use a single
+	 * copy of it, initialized with NSS_Initialize() which isn't returning any
+	 * handle with which to refer to NSS. NSS initialization and shutdown are
+	 * global for the application, so a shutdown in another NSS enabled
+	 * library would cause NSS to be stopped for libpq as well.  The fix has
+	 * been to introduce NSS_InitContext which returns a context handle to
+	 * pass to NSS_ShutdownContext.  NSS_InitContext was introduced in NSS
+	 * 3.12, but the use of it is not very well documented.
+	 * https://bugzilla.redhat.com/show_bug.cgi?id=738456
+	 *
+	 * The InitParameters struct passed can be used to override internal
+	 * values in NSS, but the usage is not documented at all. When using
+	 * NSS_Init initializations, the values are instead set via PK11_Configure
+	 * calls so the PK11_Configure documentation can be used to glean some
+	 * details on these.
+	 *
+	 * https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS/PKCS11/Module_Specs
+	 */
+	memset(&params, '\0', sizeof(params));
+	params.length = sizeof(params);
+
+	if (!ssl_database || strlen(ssl_database) == 0)
+		ereport(FATAL,
+				(errmsg("no certificate database specified")));
+
+	cert_database = psprintf("sql:%s", ssl_database);
+	nss_context = NSS_InitContext(cert_database, "", "", "",
+								  &params,
+								  NSS_INIT_READONLY | NSS_INIT_PK11RELOAD);
+	pfree(cert_database);
+
+	if (!nss_context)
+		ereport(FATAL,
+				(errmsg("unable to read certificate database \"%s\": %s",
+						ssl_database, pg_SSLerrmessage(PR_GetError()))));
+
+	/*
+	 * Import the already opened socket as we don't want to use NSPR functions
+	 * for opening the network socket due to how the PostgreSQL protocol works
+	 * with TLS connections. This function is not part of the NSPR public API,
+	 * see the comment at the top of the file for the rationale of still using
+	 * it.
+	 */
+	pr_fd = PR_ImportTCPSocket(port->sock);
+	if (!pr_fd)
+		ereport(ERROR,
+				(errmsg("unable to connect to socket")));
+
+	/*
+	 * Most of the documentation available, and implementations of, NSS/NSPR
+	 * use the PR_NewTCPSocket() function here, which has the drawback that it
+	 * can only create IPv4 sockets. Instead use PR_OpenTCPSocket() which
+	 * copes with IPv6 as well.
+	 *
+	 * We use a model filedescriptor here which is a construct in NSPR/NSS in
+	 * order to create a configuration template for sockets which can then be
+	 * applied to new sockets created. This makes more sense in a server which
+	 * accepts multiple connections and want to perform the boilerplate just
+	 * once, but it does provide a nice abstraction here as well in that we
+	 * can error out early without having performed any operation on the real
+	 * socket.
+	 */
+	model = PR_OpenTCPSocket(port->laddr.addr.ss_family);
+	if (!model)
+		ereport(ERROR,
+				(errmsg("unable to open socket")));
+
+	/*
+	 * Convert the NSPR socket to an SSL socket. Ensuring the success of this
+	 * operation is critical as NSS SSL_* functions may return SECSuccess on
+	 * the socket even though SSL hasn't been enabled, which introduce a risk
+	 * of silent downgrades.
+	 */
+	model = SSL_ImportFD(NULL, model);
+	if (!model)
+		ereport(ERROR,
+				(errmsg("unable to enable TLS on socket")));
+
+	/*
+	 * Configure basic settings for the connection over the SSL socket in
+	 * order to set it up as a server.
+	 */
+	if (SSL_OptionSet(model, SSL_SECURITY, PR_TRUE) != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to configure TLS connection")));
+
+	if (SSL_OptionSet(model, SSL_HANDSHAKE_AS_SERVER, PR_TRUE) != SECSuccess ||
+		SSL_OptionSet(model, SSL_HANDSHAKE_AS_CLIENT, PR_FALSE) != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to configure TLS connection as server")));
+
+	/*
+	 * SSLv2 is disabled by default, and SSLv3 will be excluded from the range
+	 * of allowed protocols further down. Since we really don't want these to
+	 * ever be enabled, let's use belts and suspenders and explicitly turn
+	 * them off as well.
+	 */
+	SSL_OptionSet(model, SSL_ENABLE_SSL2, PR_FALSE);
+	SSL_OptionSet(model, SSL_ENABLE_SSL3, PR_FALSE);
+
+#ifdef SSL_CBC_RANDOM_IV
+
+	/*
+	 * Enable protection against the BEAST attack in case the NSS server has
+	 * support for that. While SSLv3 is disabled, we may still allow TLSv1
+	 * which is affected. The option isn't documented as an SSL option, but as
+	 * an NSS environment variable.
+	 */
+	SSL_OptionSet(model, SSL_CBC_RANDOM_IV, PR_TRUE);
+#endif
+
+	/*
+	 * Configure the allowed ciphers. If there are no user preferred suites,
+	 * set the domestic policy.
+	 *
+	 * Historically there were different cipher policies based on export (and
+	 * import) restrictions: Domestic, Export and France. These are since long
+	 * removed with all ciphers being enabled by default. Due to backwards
+	 * compatibility, the old API is still used even though all three policies
+	 * now do the same thing.
+	 *
+	 * If SSLCipherSuites define a policy of the user, we set that rather than
+	 * enabling all ciphers via NSS_SetDomesticPolicy.
+	 *
+	 * TODO: while this code works, the set of ciphers which can be set and
+	 * still end up with a working socket is woefully underdocumented for
+	 * anything more recent than SSLv3 (the code for TLS actually calls ssl3
+	 * functions under the hood for SSL_CipherPrefSet), so it's unclear if
+	 * this is helpful or not. Using the policies works, but may be too
+	 * coarsely grained.
+	 *
+	 * Another TODO: The SSL_ImplementedCiphers table returned with calling
+	 * SSL_GetImplementedCiphers is sorted in server preference order. Sorting
+	 * SSLCipherSuites according to the order of the ciphers therein could be
+	 * a way to implement ssl_prefer_server_ciphers - if we at all want to use
+	 * cipher selection for NSS like how we do it for OpenSSL that is.
+	 */
+
+	/*
+	 * If no ciphers are specified, enable them all.
+	 */
+	if (!SSLCipherSuites || strlen(SSLCipherSuites) == 0)
+	{
+		status = NSS_SetDomesticPolicy();
+		if (status != SECSuccess)
+			ereport(ERROR,
+					(errmsg("unable to set cipher policy: %s",
+							pg_SSLerrmessage(PR_GetError()))));
+	}
+	else
+	{
+		char	   *ciphers,
+				   *c;
+
+		char	   *sep = ":;, ";
+		PRUint16	ciphercode;
+		const		PRUint16 *nss_ciphers;
+
+		/*
+		 * If the user has specified a set of preferred cipher suites we start
+		 * by turning off all the existing suites to avoid the risk of down-
+		 * grades to a weaker cipher than expected.
+		 */
+		nss_ciphers = SSL_GetImplementedCiphers();
+		for (int i = 0; i < SSL_GetNumImplementedCiphers(); i++)
+			SSL_CipherPrefSet(model, nss_ciphers[i], PR_FALSE);
+
+		ciphers = pstrdup(SSLCipherSuites);
+
+		for (c = strtok(ciphers, sep); c; c = strtok(NULL, sep))
+		{
+			ciphercode = pg_find_cipher(c);
+			if (ciphercode != INVALID_CIPHER)
+			{
+				status = SSL_CipherPrefSet(model, ciphercode, PR_TRUE);
+				if (status != SECSuccess)
+					ereport(ERROR,
+							(errmsg("invalid cipher-suite specified: %s", c)));
+			}
+		}
+
+		pfree(ciphers);
+	}
+
+	if (SSL_VersionRangeSet(model, &desired_sslver) != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to set requested SSL protocol version range")));
+
+	/*
+	 * Set up the custom IO layer.
+	 */
+	layer = init_iolayer(port);
+	if (!layer)
+		goto error;
+
+	if (PR_PushIOLayer(pr_fd, PR_TOP_IO_LAYER, layer) != PR_SUCCESS)
+	{
+		PR_Close(layer);
+		ereport(ERROR,
+				(errmsg("unable to push IO layer")));
+	}
+
+	server_cert = PK11_FindCertFromNickname(ssl_cert_file, (void *) port);
+	if (!server_cert)
+	{
+		if (dummy_ssl_passwd_cb_called)
+			ereport(ERROR,
+					(errmsg("unable to load certificate for \"%s\": %s",
+							ssl_cert_file, pg_SSLerrmessage(PR_GetError())),
+					 errhint("The certificate requires a password.")));
+		else
+			ereport(ERROR,
+					(errmsg("unable to find certificate for \"%s\": %s",
+							ssl_cert_file, pg_SSLerrmessage(PR_GetError()))));
+	}
+
+	private_key = PK11_FindKeyByAnyCert(server_cert, (void *) port);
+	if (!private_key)
+	{
+		if (dummy_ssl_passwd_cb_called)
+			ereport(ERROR,
+					(errmsg("unable to load private key for \"%s\": %s",
+							ssl_cert_file, pg_SSLerrmessage(PR_GetError())),
+					 errhint("The private key requires a password.")));
+		else
+			ereport(ERROR,
+					(errmsg("unable to find private key for \"%s\": %s",
+							ssl_cert_file, pg_SSLerrmessage(PR_GetError()))));
+	}
+
+	/*
+	 * NSS doesn't use CRL files on disk, so we use the ssl_crl_file guc to
+	 * contain the CRL nickname for the current server certificate in the NSS
+	 * certificate database. The main difference from the OpenSSL backend is
+	 * that NSS will use the CRL regardless, but being able to make sure the
+	 * CRL is loaded seems like a good feature.
+	 */
+	if (ssl_crl_file[0])
+	{
+		SECITEM_CopyItem(NULL, &crlname, &server_cert->derSubject);
+		crl = SEC_FindCrlByName(CERT_GetDefaultCertDB(), &crlname, SEC_CRL_TYPE);
+		if (!crl)
+			ereport(ERROR,
+					(errmsg("specified CRL not found in database")));
+		SEC_DestroyCrl(crl);
+	}
+
+	/*
+	 * Finally we must configure the socket for being a server by setting the
+	 * certificate and key. The NULL parameter is an SSLExtraServerCertData
+	 * pointer with the final parameter being the size of the extra server
+	 * cert data structure pointed to. This is typically only used for
+	 * credential delegation.
+	 */
+	status = SSL_ConfigServerCert(model, server_cert, private_key, NULL, 0);
+	if (status != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to configure server for TLS server connections: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+
+	ssl_loaded_verify_locations = true;
+
+	/*
+	 * At this point, we no longer have use for the certificate and private
+	 * key as they have been copied into the context by NSS. Destroy our
+	 * copies explicitly to clean out the memory as best we can.
+	 */
+	CERT_DestroyCertificate(server_cert);
+	SECKEY_DestroyPrivateKey(private_key);
+
+	status = SSL_AuthCertificateHook(model, pg_cert_auth_handler, (void *) port);
+	if (status != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to install authcert hook: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+	SSL_BadCertHook(model, pg_bad_cert_handler, (void *) port);
+	SSL_OptionSet(model, SSL_REQUEST_CERTIFICATE, PR_TRUE);
+	SSL_OptionSet(model, SSL_REQUIRE_CERTIFICATE, PR_FALSE);
+
+	port->pr_fd = SSL_ImportFD(model, pr_fd);
+	if (!port->pr_fd)
+		ereport(ERROR,
+				(errmsg("unable to initialize")));
+
+	PR_Close(model);
+
+	/*
+	 * Force a handshake on the next I/O request, the second parameter means
+	 * that we are a server, PR_FALSE would indicate being a client. NSPR
+	 * requires us to call SSL_ResetHandshake since we imported an already
+	 * established socket.
+	 */
+	status = SSL_ResetHandshake(port->pr_fd, PR_TRUE);
+	if (status != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to initiate handshake: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+	status = SSL_ForceHandshake(port->pr_fd);
+	if (status != SECSuccess)
+		ereport(ERROR,
+				(errmsg("unable to handshake: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+
+	port->ssl_in_use = true;
+	return 0;
+
+error:
+	return 1;
+}
+
+ssize_t
+be_tls_read(Port *port, void *ptr, size_t len, int *waitfor)
+{
+	ssize_t		n_read;
+	PRErrorCode err;
+
+	n_read = PR_Read(port->pr_fd, ptr, len);
+
+	if (n_read < 0)
+	{
+		err = PR_GetError();
+
+		if (err == PR_WOULD_BLOCK_ERROR)
+		{
+			*waitfor = WL_SOCKET_READABLE;
+			errno = EWOULDBLOCK;
+		}
+		else
+			errno = ECONNRESET;
+	}
+
+	return n_read;
+}
+
+ssize_t
+be_tls_write(Port *port, void *ptr, size_t len, int *waitfor)
+{
+	ssize_t		n_write;
+	PRErrorCode err;
+	PRIntn		flags = 0;
+
+	/*
+	 * The flags parameter to PR_Send is no longer used and is, according to
+	 * the documentation, required to be zero.
+	 */
+	n_write = PR_Send(port->pr_fd, ptr, len, flags, PR_INTERVAL_NO_WAIT);
+
+	if (n_write < 0)
+	{
+		err = PR_GetError();
+
+		if (err == PR_WOULD_BLOCK_ERROR)
+		{
+			*waitfor = WL_SOCKET_WRITEABLE;
+			errno = EWOULDBLOCK;
+		}
+		else
+			errno = ECONNRESET;
+	}
+
+	return n_write;
+}
+
+void
+be_tls_close(Port *port)
+{
+	if (!port)
+		return;
+
+	if (port->peer_cn)
+	{
+		SSL_InvalidateSession(port->pr_fd);
+		pfree(port->peer_cn);
+		port->peer_cn = NULL;
+	}
+
+	PR_Close(port->pr_fd);
+	port->pr_fd = NULL;
+	port->ssl_in_use = false;
+
+	if (nss_context)
+	{
+		NSS_ShutdownContext(nss_context);
+		nss_context = NULL;
+	}
+}
+
+void
+be_tls_destroy(void)
+{
+	/*
+	 * It reads a bit odd to clear a session cache when we are destroying the
+	 * context altogether, but if the session cache isn't cleared before
+	 * shutting down the context it will fail with SEC_ERROR_BUSY.
+	 */
+	SSL_ClearSessionCache();
+}
+
+int
+be_tls_get_cipher_bits(Port *port)
+{
+	SECStatus	status;
+	SSLChannelInfo channel;
+	SSLCipherSuiteInfo suite;
+
+	status = SSL_GetChannelInfo(port->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+		goto error;
+
+	status = SSL_GetCipherSuiteInfo(channel.cipherSuite, &suite, sizeof(suite));
+	if (status != SECSuccess)
+		goto error;
+
+	return suite.effectiveKeyBits;
+
+error:
+	ereport(WARNING,
+			(errmsg("unable to extract TLS session information: %s",
+					pg_SSLerrmessage(PR_GetError()))));
+	return 0;
+}
+
+/*
+ * be_tls_get_compression
+ *
+ * NSS disabled support for TLS compression in version 3.33 and removed the
+ * code in a subsequent release. The API for retrieving information about
+ * compression as well as enabling it is kept for backwards compatibility, but
+ * we don't need to consult it since it was only available for SSLv3 which we
+ * don't support.
+ *
+ * https://bugzilla.mozilla.org/show_bug.cgi?id=1409587
+ */
+bool
+be_tls_get_compression(Port *port)
+{
+	return false;
+}
+
+/*
+ * be_tls_get_version
+ *
+ * Returns the protocol version used for the current connection, or NULL in
+ * case of errors.
+ */
+const char *
+be_tls_get_version(Port *port)
+{
+	SECStatus	status;
+	SSLChannelInfo channel;
+
+	status = SSL_GetChannelInfo(port->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+	{
+		ereport(WARNING,
+				(errmsg("unable to extract TLS session information: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+		return NULL;
+	}
+
+	return ssl_protocol_version_to_string(channel.protocolVersion);
+}
+
+const char *
+be_tls_get_cipher(Port *port)
+{
+	SECStatus	status;
+	SSLChannelInfo channel;
+	SSLCipherSuiteInfo suite;
+
+	status = SSL_GetChannelInfo(port->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+		goto error;
+
+	status = SSL_GetCipherSuiteInfo(channel.cipherSuite, &suite, sizeof(suite));
+	if (status != SECSuccess)
+		goto error;
+
+	return suite.cipherSuiteName;
+
+error:
+	ereport(WARNING,
+			(errmsg("unable to extract TLS session information: %s",
+					pg_SSLerrmessage(PR_GetError()))));
+	return NULL;
+}
+
+void
+be_tls_get_peer_subject_name(Port *port, char *ptr, size_t len)
+{
+	CERTCertificate *certificate;
+
+	certificate = SSL_PeerCertificate(port->pr_fd);
+	if (certificate)
+		strlcpy(ptr, CERT_NameToAscii(&certificate->subject), len);
+	else
+		ptr[0] = '\0';
+}
+
+void
+be_tls_get_peer_issuer_name(Port *port, char *ptr, size_t len)
+{
+	CERTCertificate *certificate;
+
+	certificate = SSL_PeerCertificate(port->pr_fd);
+	if (certificate)
+		strlcpy(ptr, CERT_NameToAscii(&certificate->issuer), len);
+	else
+		ptr[0] = '\0';
+}
+
+void
+be_tls_get_peer_serial(Port *port, char *ptr, size_t len)
+{
+	CERTCertificate *certificate;
+
+	certificate = SSL_PeerCertificate(port->pr_fd);
+	if (certificate)
+		snprintf(ptr, len, "%li", DER_GetInteger(&(certificate->serialNumber)));
+	else
+		ptr[0] = '\0';
+}
+
+char *
+be_tls_get_certificate_hash(Port *port, size_t *len)
+{
+	CERTCertificate *certificate;
+	SECOidTag	signature_alg;
+	SECOidTag	digest_alg;
+	int			digest_len;
+	const NSSSignatureAlgorithms *candidate;
+	SECStatus	status;
+	PLArenaPool *arena = NULL;
+	SECItem		digest;
+	char	   *ret;
+
+	*len = 0;
+	certificate = SSL_LocalCertificate(port->pr_fd);
+	if (!certificate)
+		return NULL;
+
+	signature_alg = SECOID_GetAlgorithmTag(&certificate->signature);
+
+	candidate = NSS_SCRAMDigestAlgorithm;
+	while (candidate->signature)
+	{
+		if (signature_alg == candidate->signature)
+		{
+			digest_alg = candidate->hash;
+			digest_len = candidate->len;
+			break;
+		}
+
+		candidate++;
+	}
+
+	if (!candidate->signature)
+		elog(ERROR, "could not find digest for OID '%s'",
+			 SECOID_FindOIDTagDescription(signature_alg));
+
+	arena = PORT_NewArena(SEC_ASN1_DEFAULT_ARENA_SIZE);
+	digest.data = PORT_ArenaZAlloc(arena, sizeof(unsigned char) * digest_len);
+	digest.len = digest_len;
+
+	status = PK11_HashBuf(digest_alg, digest.data,
+						  certificate->derCert.data,
+						  certificate->derCert.len);
+
+	if (status != SECSuccess)
+	{
+		PORT_FreeArena(arena, PR_TRUE);
+		return NULL;
+	}
+
+	ret = palloc(digest.len);
+	memcpy(ret, digest.data, digest.len);
+	*len = digest_len;
+	PORT_FreeArena(arena, PR_TRUE);
+
+	return ret;
+}
+
+/* ------------------------------------------------------------ */
+/*						Internal functions						*/
+/* ------------------------------------------------------------ */
+
+/*
+ * default_nss_tls_init
+ *
+ * The default TLS init hook function which users can override for installing
+ * their own passphrase callbacks and similar actions. In case no callback has
+ * been configured, or the callback isn't reload capable during a server
+ * reload, the dummy callback will be installed.
+ *
+ * The private data for the callback is set differently depending on how it's
+ * invoked. For calls which may invoke the callback deeper in the callstack
+ * the private data is set with SSL_SetPKCS11PinArg. When the call is directly
+ * invoking the callback, like PK11_FindCertFromNickname, then the private
+ * data is passed as a parameter. Setting the data with SSL_SetPKCS11PinArg is
+ * thus not required but good practice.
+ *
+ * NSS doesn't provide a default callback like OpenSSL does, but a callback is
+ * required to be set.  The password callback can be installed at any time, but
+ * setting the private data with SSL_SetPKCS11PinArg requires a PR Filedesc.
+ */
+static void
+default_nss_tls_init(bool isServerStart)
+{
+	/*
+	 * No user-defined callback has been configured, install the dummy call-
+	 * back since we must set something.
+	 */
+	if (!ssl_passphrase_command[0])
+		PK11_SetPasswordFunc(dummy_ssl_passphrase_cb);
+	else
+	{
+		/*
+		 * There is a user-defined callback, set it unless we are in a restart
+		 * and cannot handle restarts due to an interactive callback.
+		 */
+		if (isServerStart)
+			PK11_SetPasswordFunc(external_ssl_passphrase_cb);
+		else
+		{
+			if (ssl_passphrase_command_supports_reload)
+				PK11_SetPasswordFunc(external_ssl_passphrase_cb);
+			else
+				PK11_SetPasswordFunc(dummy_ssl_passphrase_cb);
+		}
+	}
+}
+
+/*
+ * external_ssl_passphrase_cb
+ *
+ * Runs the callback configured by ssl_passphrase_command and returns the
+ * captured password back to NSS.
+ */
+static char *
+external_ssl_passphrase_cb(PK11SlotInfo *slot, PRBool retry, void *arg)
+{
+	/*
+	 * NSS use a hardcoded 256 byte buffer for reading the password so set the
+	 * same limit for our callback buffer.
+	 */
+	char		buf[256];
+	int			len;
+	char	   *password = NULL;
+	char	   *prompt;
+
+	/*
+	 * Since there is no password callback in NSS when the server starts up,
+	 * it makes little sense to create an interactive callback. Thus, if this
+	 * is a retry attempt then give up immediately.
+	 */
+	if (retry)
+		return NULL;
+
+	/*
+	 * Construct the same prompt that NSS uses internally even though it is
+	 * unlikely to serve much purpose, but we must set a prompt so we might as
+	 * well do it right.
+	 */
+	prompt = psprintf("Enter Password or Pin for \"%s\":",
+					  PK11_GetTokenName(slot));
+
+	len = run_ssl_passphrase_command(prompt, ssl_is_server_start, buf, sizeof(buf));
+	pfree(prompt);
+
+	if (!len)
+		return NULL;
+
+	/*
+	 * At least one byte with password content was returned, and NSS requires
+	 * that we return it allocated in NSS controlled memory. If we fail to
+	 * allocate then abort without passing back NULL and bubble up the error
+	 * on the PG side.
+	 */
+	password = (char *) PR_Malloc(len + 1);
+	if (!password)
+	{
+		explicit_bzero(buf, sizeof(buf));
+		ereport(ERROR,
+				(errcode(ERRCODE_OUT_OF_MEMORY),
+				 errmsg("out of memory")));
+	}
+	strlcpy(password, buf, sizeof(password));
+	explicit_bzero(buf, sizeof(buf));
+
+	return password;
+}
+
+/*
+ * dummy_ssl_passphrase_cb
+ *
+ * Return unsuccessful if we are asked to provide the passphrase for a cert or
+ * key, without having a passphrase callback installed.
+ */
+static char *
+dummy_ssl_passphrase_cb(PK11SlotInfo *slot, PRBool retry, void *arg)
+{
+	dummy_ssl_passwd_cb_called = true;
+	return NULL;
+}
+
+static SECStatus
+pg_bad_cert_handler(void *arg, PRFileDesc * fd)
+{
+	Port	   *port = (Port *) arg;
+
+	port->peer_cert_valid = false;
+	return SECFailure;
+}
+
+static SECStatus
+pg_cert_auth_handler(void *arg, PRFileDesc * fd, PRBool checksig, PRBool isServer)
+{
+	SECStatus	status;
+	Port	   *port = (Port *) arg;
+	CERTCertificate *cert;
+	char	   *peer_cn;
+	int			len;
+
+	status = SSL_AuthCertificate(CERT_GetDefaultCertDB(), port->pr_fd, checksig, PR_TRUE);
+	if (status == SECSuccess)
+	{
+		cert = SSL_PeerCertificate(port->pr_fd);
+		len = strlen(cert->subjectName);
+		peer_cn = MemoryContextAllocZero(TopMemoryContext, len + 1);
+
+		/*
+		 * Skip over the key= portion of the key=value containing the peer CN.
+		 */
+		if (strncmp(cert->subjectName, "CN=", 3) == 0)
+			strlcpy(peer_cn, cert->subjectName + strlen("CN="), len + 1);
+		else
+			strlcpy(peer_cn, cert->subjectName, len + 1);
+		CERT_DestroyCertificate(cert);
+
+		port->peer_cn = peer_cn;
+		port->peer_cert_valid = true;
+	}
+
+	return status;
+}
+
+static PRInt32
+pg_ssl_read(PRFileDesc *fd, void *buf, PRInt32 amount, PRIntn flags,
+			PRIntervalTime timeout)
+{
+	PRRecvFN	read_fn;
+	PRInt32		n_read;
+
+	read_fn = fd->lower->methods->recv;
+	n_read = read_fn(fd->lower, buf, amount, flags, timeout);
+
+	return n_read;
+}
+
+static PRInt32
+pg_ssl_write(PRFileDesc *fd, const void *buf, PRInt32 amount, PRIntn flags,
+			 PRIntervalTime timeout)
+{
+	PRSendFN	send_fn;
+	PRInt32		n_write;
+
+	send_fn = fd->lower->methods->send;
+	n_write = send_fn(fd->lower, buf, amount, flags, timeout);
+
+	return n_write;
+}
+
+static PRStatus
+pg_ssl_close(PRFileDesc *fd)
+{
+	/*
+	 * Disconnect our private Port from the fd before closing out the stack.
+	 * (Debug builds of NSPR will assert if we do not.)
+	 */
+	fd->secret = NULL;
+	return PR_GetDefaultIOMethods()->close(fd);
+}
+
+static PRFileDesc *
+init_iolayer(Port *port)
+{
+	const		PRIOMethods *default_methods;
+	PRFileDesc *layer;
+
+	/*
+	 * Start by initializing our layer with all the default methods so that we
+	 * can selectively override the ones we want while still ensuring that we
+	 * have a complete layer specification.
+	 */
+	default_methods = PR_GetDefaultIOMethods();
+	memcpy(&pr_iomethods, default_methods, sizeof(PRIOMethods));
+
+	pr_iomethods.recv = pg_ssl_read;
+	pr_iomethods.send = pg_ssl_write;
+	pr_iomethods.close = pg_ssl_close;
+
+	/*
+	 * Each IO layer must be identified by a unique name, where uniqueness is
+	 * per connection. Each connection in a postgres cluster can generate the
+	 * identity from the same string as they will create their IO layers on
+	 * different sockets. Only one layer per socket can have the same name.
+	 */
+	pr_id = PR_GetUniqueIdentity("PostgreSQL Server");
+	if (pr_id == PR_INVALID_IO_LAYER)
+	{
+		ereport(ERROR,
+				(errmsg("out of memory when setting up TLS connection")));
+		return NULL;
+	}
+
+	/*
+	 * Create the actual IO layer as a stub such that it can be pushed onto
+	 * the layer stack. The step via a stub is required as we define custom
+	 * callbacks.
+	 */
+	layer = PR_CreateIOLayerStub(pr_id, &pr_iomethods);
+	if (!layer)
+	{
+		ereport(ERROR,
+				(errmsg("unable to create NSS I/O layer")));
+		return NULL;
+	}
+
+	/* Store the Port as private data available in callbacks */
+	layer->secret = (void *) port;
+
+	return layer;
+}
+
+static char *
+ssl_protocol_version_to_string(int v)
+{
+	switch (v)
+	{
+			/* SSL v2 and v3 are not supported */
+		case SSL_LIBRARY_VERSION_2:
+		case SSL_LIBRARY_VERSION_3_0:
+			Assert(false);
+			break;
+
+		case SSL_LIBRARY_VERSION_TLS_1_0:
+			return pstrdup("TLSv1.0");
+		case SSL_LIBRARY_VERSION_TLS_1_1:
+			return pstrdup("TLSv1.1");
+		case SSL_LIBRARY_VERSION_TLS_1_2:
+			return pstrdup("TLSv1.2");
+		case SSL_LIBRARY_VERSION_TLS_1_3:
+			return pstrdup("TLSv1.3");
+	}
+
+	return pstrdup("unknown");
+}
+
+
+/*
+ * ssl_protocol_version_to_nss
+ *			Translate PostgreSQL TLS version to NSS version
+ *
+ * Returns zero in case the requested TLS version is undefined (PG_ANY) and
+ * should be set by the caller, or -1 on failure.
+ */
+static uint16
+ssl_protocol_version_to_nss(int v, const char *guc_name)
+{
+	switch (v)
+	{
+			/*
+			 * There is no SSL_LIBRARY_ macro defined in NSS with the value
+			 * zero, so we use this to signal the caller that the highest
+			 * useful version should be set on the connection.
+			 */
+		case PG_TLS_ANY:
+			return 0;
+
+			/*
+			 * No guard is required here as there are no versions of NSS
+			 * without support for TLS1.
+			 */
+		case PG_TLS1_VERSION:
+			return SSL_LIBRARY_VERSION_TLS_1_0;
+		case PG_TLS1_1_VERSION:
+#ifdef SSL_LIBRARY_VERSION_TLS_1_1
+			return SSL_LIBRARY_VERSION_TLS_1_1;
+#else
+			break;
+#endif
+		case PG_TLS1_2_VERSION:
+#ifdef SSL_LIBRARY_VERSION_TLS_1_2
+			return SSL_LIBRARY_VERSION_TLS_1_2;
+#else
+			break;
+#endif
+		case PG_TLS1_3_VERSION:
+#ifdef SSL_LIBRARY_VERSION_TLS_1_3
+			return SSL_LIBRARY_VERSION_TLS_1_3;
+#else
+			break;
+#endif
+		default:
+			break;
+	}
+
+	return -1;
+}
+
+/*
+ * pg_SSLerrmessage
+ *		Create and return a human readable error message given
+ *		the specified error code
+ *
+ * PR_ErrorToName only converts the enum identifier of the error to string,
+ * but that can be quite useful for debugging (and in case PR_ErrorToString is
+ * unable to render a message then we at least have something).
+ */
+static char *
+pg_SSLerrmessage(PRErrorCode errcode)
+{
+	return psprintf("%s (%s)",
+					PR_ErrorToString(errcode, PR_LANGUAGE_I_DEFAULT),
+					PR_ErrorToName(errcode));
+}
diff --git a/src/backend/libpq/be-secure.c b/src/backend/libpq/be-secure.c
index 2ae507a902..f39977b80c 100644
--- a/src/backend/libpq/be-secure.c
+++ b/src/backend/libpq/be-secure.c
@@ -49,6 +49,9 @@ bool		ssl_passphrase_command_supports_reload;
 #ifdef USE_SSL
 bool		ssl_loaded_verify_locations = false;
 #endif
+#ifdef USE_NSS
+char	   *ssl_database;
+#endif
 
 /* GUC variable controlling SSL cipher list */
 char	   *SSLCipherSuites = NULL;
diff --git a/src/backend/libpq/hba.c b/src/backend/libpq/hba.c
index 3a78d2043e..eb1b028464 100644
--- a/src/backend/libpq/hba.c
+++ b/src/backend/libpq/hba.c
@@ -1040,7 +1040,7 @@ parse_hba_line(TokenizedLine *tok_line, int elevel)
 			ereport(elevel,
 					(errcode(ERRCODE_CONFIG_FILE_ERROR),
 					 errmsg("hostssl record cannot match because SSL is not supported by this build"),
-					 errhint("Compile with --with-openssl to use SSL connections."),
+					 errhint("Compile with --with-openssl or --with-nss to use SSL connections."),
 					 errcontext("line %d of configuration file \"%s\"",
 								line_num, HbaFileName)));
 			*err_msg = "hostssl record cannot match because SSL is not supported by this build";
diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c
index bb34630e8e..a1a36cb5e2 100644
--- a/src/backend/utils/misc/guc.c
+++ b/src/backend/utils/misc/guc.c
@@ -4262,7 +4262,11 @@ static struct config_string ConfigureNamesString[] =
 		},
 		&ssl_library,
 #ifdef USE_SSL
+#if defined(USE_OPENSSL)
 		"OpenSSL",
+#elif defined(USE_NSS)
+		"NSS",
+#endif
 #else
 		"",
 #endif
@@ -4320,6 +4324,18 @@ static struct config_string ConfigureNamesString[] =
 		check_canonical_path, assign_pgstat_temp_directory, NULL
 	},
 
+#ifdef USE_NSS
+	{
+		{"ssl_database", PGC_SIGHUP, CONN_AUTH_SSL,
+			gettext_noop("Location of the NSS certificate database."),
+			NULL
+		},
+		&ssl_database,
+		"",
+		NULL, NULL, NULL
+	},
+#endif
+
 	{
 		{"synchronous_standby_names", PGC_SIGHUP, REPLICATION_PRIMARY,
 			gettext_noop("Number of synchronous standbys and list of names of potential synchronous ones."),
@@ -4348,8 +4364,10 @@ static struct config_string ConfigureNamesString[] =
 			GUC_SUPERUSER_ONLY
 		},
 		&SSLCipherSuites,
-#ifdef USE_OPENSSL
+#if defined(USE_OPENSSL)
 		"HIGH:MEDIUM:+3DES:!aNULL",
+#elif defined (USE_NSS)
+		"",
 #else
 		"none",
 #endif
diff --git a/src/common/Makefile b/src/common/Makefile
index 25c55bd642..614f93af09 100644
--- a/src/common/Makefile
+++ b/src/common/Makefile
@@ -79,7 +79,7 @@ OBJS_COMMON = \
 	wait_error.o \
 	wchar.o
 
-ifeq ($(with_openssl),yes)
+ifeq ($(with_ssl),openssl)
 OBJS_COMMON += \
 	protocol_openssl.o \
 	sha2_openssl.o
diff --git a/src/include/common/pg_nss.h b/src/include/common/pg_nss.h
new file mode 100644
index 0000000000..008fee85f1
--- /dev/null
+++ b/src/include/common/pg_nss.h
@@ -0,0 +1,175 @@
+/*-------------------------------------------------------------------------
+ *
+ * pg_nss.h
+ *	  Support for NSS as a TLS backend
+ *
+ * These definitions are used by both frontend and backend code.
+ *
+ * Copyright (c) 2020, PostgreSQL Global Development Group
+ *
+ * IDENTIFICATION
+ *        src/include/common/pg_nss.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef PG_NSS_H
+#define PG_NSS_H
+
+#ifdef USE_NSS
+#define NO_NSPR_10_SUPPORT
+#include <nss/hasht.h>
+#include <nss/secoidt.h>
+#include <nss/sslproto.h>
+
+PRUint16	pg_find_cipher(char *name);
+
+typedef struct
+{
+	SECOidTag	signature;
+	SECOidTag	hash;
+	int			len;
+}			NSSSignatureAlgorithms;
+
+typedef struct
+{
+	const char *name;
+	PRUint16	number;
+}			NSSCiphers;
+
+#define INVALID_CIPHER	0xFFFF
+
+static const NSSSignatureAlgorithms NSS_SCRAMDigestAlgorithm[] = {
+
+	{SEC_OID_PKCS1_MD5_WITH_RSA_ENCRYPTION, SEC_OID_SHA256, SHA256_LENGTH},
+	{SEC_OID_PKCS1_SHA1_WITH_RSA_ENCRYPTION, SEC_OID_SHA256, SHA256_LENGTH},
+	{SEC_OID_ISO_SHA_WITH_RSA_SIGNATURE, SEC_OID_SHA256, SHA256_LENGTH},
+	{SEC_OID_ISO_SHA1_WITH_RSA_SIGNATURE, SEC_OID_SHA256, SHA256_LENGTH},
+	{SEC_OID_PKCS5_PBE_WITH_MD5_AND_DES_CBC, SEC_OID_SHA256, SHA256_LENGTH},
+
+	{SEC_OID_ANSIX962_ECDSA_SHA224_SIGNATURE, SEC_OID_SHA224, SHA224_LENGTH},
+	{SEC_OID_PKCS1_SHA224_WITH_RSA_ENCRYPTION, SEC_OID_SHA224, SHA224_LENGTH},
+	{SEC_OID_NIST_DSA_SIGNATURE_WITH_SHA224_DIGEST, SEC_OID_SHA224, SHA224_LENGTH},
+
+	{SEC_OID_ANSIX962_ECDSA_SHA256_SIGNATURE, SEC_OID_SHA256, SHA256_LENGTH},
+	{SEC_OID_PKCS1_SHA256_WITH_RSA_ENCRYPTION, SEC_OID_SHA256, SHA256_LENGTH},
+	{SEC_OID_NIST_DSA_SIGNATURE_WITH_SHA256_DIGEST, SEC_OID_SHA256, SHA256_LENGTH},
+
+	{SEC_OID_ANSIX962_ECDSA_SHA384_SIGNATURE, SEC_OID_SHA384, SHA384_LENGTH},
+	{SEC_OID_PKCS1_SHA384_WITH_RSA_ENCRYPTION, SEC_OID_SHA384, SHA384_LENGTH},
+
+	{SEC_OID_ANSIX962_ECDSA_SHA512_SIGNATURE, SEC_OID_SHA512, SHA512_LENGTH},
+	{SEC_OID_PKCS1_SHA512_WITH_RSA_ENCRYPTION, SEC_OID_SHA512, SHA512_LENGTH},
+
+	{0, 0}
+};
+
+/*
+ * This list is a partial copy of the ciphers in NSS files lib/ssl/sslproto.h
+ * in order to provide a human readable version of the ciphers. It would be
+ * nice to not have to have this, but NSS doesn't provide any API addressing
+ * the ciphers by name. TODO: do we want more of the ciphers, or perhaps less?
+ */
+static const NSSCiphers NSS_CipherList[] = {
+
+	{"TLS_NULL_WITH_NULL_NULL", TLS_NULL_WITH_NULL_NULL},
+
+	{"TLS_RSA_WITH_NULL_MD5", TLS_RSA_WITH_NULL_MD5},
+	{"TLS_RSA_WITH_NULL_SHA", TLS_RSA_WITH_NULL_SHA},
+	{"TLS_RSA_WITH_RC4_128_MD5", TLS_RSA_WITH_RC4_128_MD5},
+	{"TLS_RSA_WITH_RC4_128_SHA", TLS_RSA_WITH_RC4_128_SHA},
+	{"TLS_RSA_WITH_IDEA_CBC_SHA", TLS_RSA_WITH_IDEA_CBC_SHA},
+	{"TLS_RSA_WITH_DES_CBC_SHA", TLS_RSA_WITH_DES_CBC_SHA},
+	{"TLS_RSA_WITH_3DES_EDE_CBC_SHA", TLS_RSA_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_DH_DSS_WITH_DES_CBC_SHA", TLS_DH_DSS_WITH_DES_CBC_SHA},
+	{"TLS_DH_DSS_WITH_3DES_EDE_CBC_SHA", TLS_DH_DSS_WITH_3DES_EDE_CBC_SHA},
+	{"TLS_DH_RSA_WITH_DES_CBC_SHA", TLS_DH_RSA_WITH_DES_CBC_SHA},
+	{"TLS_DH_RSA_WITH_3DES_EDE_CBC_SHA", TLS_DH_RSA_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_DHE_DSS_WITH_DES_CBC_SHA", TLS_DHE_DSS_WITH_DES_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_3DES_EDE_CBC_SHA", TLS_DHE_DSS_WITH_3DES_EDE_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_DES_CBC_SHA", TLS_DHE_RSA_WITH_DES_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA", TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_DH_anon_WITH_RC4_128_MD5", TLS_DH_anon_WITH_RC4_128_MD5},
+	{"TLS_DH_anon_WITH_DES_CBC_SHA", TLS_DH_anon_WITH_DES_CBC_SHA},
+	{"TLS_DH_anon_WITH_3DES_EDE_CBC_SHA", TLS_DH_anon_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_RSA_WITH_AES_128_CBC_SHA", TLS_RSA_WITH_AES_128_CBC_SHA},
+	{"TLS_DH_DSS_WITH_AES_128_CBC_SHA", TLS_DH_DSS_WITH_AES_128_CBC_SHA},
+	{"TLS_DH_RSA_WITH_AES_128_CBC_SHA", TLS_DH_RSA_WITH_AES_128_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_AES_128_CBC_SHA", TLS_DHE_DSS_WITH_AES_128_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_AES_128_CBC_SHA", TLS_DHE_RSA_WITH_AES_128_CBC_SHA},
+	{"TLS_DH_anon_WITH_AES_128_CBC_SHA", TLS_DH_anon_WITH_AES_128_CBC_SHA},
+
+	{"TLS_RSA_WITH_AES_256_CBC_SHA", TLS_RSA_WITH_AES_256_CBC_SHA},
+	{"TLS_DH_DSS_WITH_AES_256_CBC_SHA", TLS_DH_DSS_WITH_AES_256_CBC_SHA},
+	{"TLS_DH_RSA_WITH_AES_256_CBC_SHA", TLS_DH_RSA_WITH_AES_256_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_AES_256_CBC_SHA", TLS_DHE_DSS_WITH_AES_256_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_AES_256_CBC_SHA", TLS_DHE_RSA_WITH_AES_256_CBC_SHA},
+	{"TLS_DH_anon_WITH_AES_256_CBC_SHA", TLS_DH_anon_WITH_AES_256_CBC_SHA},
+	{"TLS_RSA_WITH_NULL_SHA256", TLS_RSA_WITH_NULL_SHA256},
+	{"TLS_RSA_WITH_AES_128_CBC_SHA256", TLS_RSA_WITH_AES_128_CBC_SHA256},
+	{"TLS_RSA_WITH_AES_256_CBC_SHA256", TLS_RSA_WITH_AES_256_CBC_SHA256},
+
+	{"TLS_DHE_DSS_WITH_AES_128_CBC_SHA256", TLS_DHE_DSS_WITH_AES_128_CBC_SHA256},
+	{"TLS_RSA_WITH_CAMELLIA_128_CBC_SHA", TLS_RSA_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DH_DSS_WITH_CAMELLIA_128_CBC_SHA", TLS_DH_DSS_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DH_RSA_WITH_CAMELLIA_128_CBC_SHA", TLS_DH_RSA_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_CAMELLIA_128_CBC_SHA", TLS_DHE_DSS_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA", TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DH_anon_WITH_CAMELLIA_128_CBC_SHA", TLS_DH_anon_WITH_CAMELLIA_128_CBC_SHA},
+
+	{"TLS_DHE_DSS_WITH_RC4_128_SHA", TLS_DHE_DSS_WITH_RC4_128_SHA},
+	{"TLS_DHE_RSA_WITH_AES_128_CBC_SHA256", TLS_DHE_RSA_WITH_AES_128_CBC_SHA256},
+	{"TLS_DHE_DSS_WITH_AES_256_CBC_SHA256", TLS_DHE_DSS_WITH_AES_256_CBC_SHA256},
+	{"TLS_DHE_RSA_WITH_AES_256_CBC_SHA256", TLS_DHE_RSA_WITH_AES_256_CBC_SHA256},
+
+	{"TLS_RSA_WITH_CAMELLIA_256_CBC_SHA", TLS_RSA_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DH_DSS_WITH_CAMELLIA_256_CBC_SHA", TLS_DH_DSS_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DH_RSA_WITH_CAMELLIA_256_CBC_SHA", TLS_DH_RSA_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_CAMELLIA_256_CBC_SHA", TLS_DHE_DSS_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA", TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DH_anon_WITH_CAMELLIA_256_CBC_SHA", TLS_DH_anon_WITH_CAMELLIA_256_CBC_SHA},
+
+	{"TLS_RSA_WITH_SEED_CBC_SHA", TLS_RSA_WITH_SEED_CBC_SHA},
+
+	{"TLS_RSA_WITH_AES_128_GCM_SHA256", TLS_RSA_WITH_AES_128_GCM_SHA256},
+	{"TLS_RSA_WITH_AES_256_GCM_SHA384", TLS_RSA_WITH_AES_256_GCM_SHA384},
+	{"TLS_DHE_RSA_WITH_AES_128_GCM_SHA256", TLS_DHE_RSA_WITH_AES_128_GCM_SHA256},
+	{"TLS_DHE_RSA_WITH_AES_256_GCM_SHA384", TLS_DHE_RSA_WITH_AES_256_GCM_SHA384},
+	{"TLS_DHE_DSS_WITH_AES_128_GCM_SHA256", TLS_DHE_DSS_WITH_AES_128_GCM_SHA256},
+	{"TLS_DHE_DSS_WITH_AES_256_GCM_SHA384", TLS_DHE_DSS_WITH_AES_256_GCM_SHA384},
+
+	{"TLS_AES_128_GCM_SHA256", TLS_AES_128_GCM_SHA256},
+	{"TLS_AES_256_GCM_SHA384", TLS_AES_256_GCM_SHA384},
+	{"TLS_CHACHA20_POLY1305_SHA256", TLS_CHACHA20_POLY1305_SHA256},
+	{NULL, 0}
+};
+
+/*
+ * pg_find_cipher
+ *			Translate an NSS ciphername to the cipher code
+ *
+ * Searches the configured ciphers for the corresponding cipher code to the
+ * name. Search is performed case insensitive.
+ */
+PRUint16
+pg_find_cipher(char *name)
+{
+	const		NSSCiphers *cipher_list = NSS_CipherList;
+
+	while (cipher_list->name)
+	{
+		if (pg_strcasecmp(cipher_list->name, name) == 0)
+			return cipher_list->number;
+
+		cipher_list++;
+	}
+
+	return 0xFFFF;
+}
+
+#endif							/* USE_NSS */
+
+#endif							/* PG_NSS_H */
diff --git a/src/include/libpq/libpq-be.h b/src/include/libpq/libpq-be.h
index 0a23281ad5..74f88b628e 100644
--- a/src/include/libpq/libpq-be.h
+++ b/src/include/libpq/libpq-be.h
@@ -192,13 +192,18 @@ typedef struct Port
 	bool		peer_cert_valid;
 
 	/*
-	 * OpenSSL structures. (Keep these last so that the locations of other
-	 * fields are the same whether or not you build with OpenSSL.)
+	 * SSL backend specific structures. (Keep these last so that the locations
+	 * of other fields are the same whether or not you build with SSL
+	 * enabled.)
 	 */
 #ifdef USE_OPENSSL
 	SSL		   *ssl;
 	X509	   *peer;
 #endif
+
+#ifdef USE_NSS
+	void	   *pr_fd;
+#endif
 } Port;
 
 #ifdef USE_SSL
@@ -282,7 +287,7 @@ extern void be_tls_get_peer_serial(Port *port, char *ptr, size_t len);
  * This is not supported with old versions of OpenSSL that don't have
  * the X509_get_signature_nid() function.
  */
-#if defined(USE_OPENSSL) && defined(HAVE_X509_GET_SIGNATURE_NID)
+#if defined(USE_NSS) || (defined(USE_OPENSSL) && defined(HAVE_X509_GET_SIGNATURE_NID))
 #define HAVE_BE_TLS_GET_CERTIFICATE_HASH
 extern char *be_tls_get_certificate_hash(Port *port, size_t *len);
 #endif
@@ -292,6 +297,10 @@ extern char *be_tls_get_certificate_hash(Port *port, size_t *len);
 typedef void (*openssl_tls_init_hook_typ) (SSL_CTX *context, bool isServerStart);
 extern PGDLLIMPORT openssl_tls_init_hook_typ openssl_tls_init_hook;
 #endif
+#ifdef USE_NSS
+typedef void (*nss_tls_init_hook_type) (bool isServerStart);
+extern PGDLLIMPORT nss_tls_init_hook_type nss_tls_init_hook;
+#endif
 
 #endif							/* USE_SSL */
 
diff --git a/src/include/libpq/libpq.h b/src/include/libpq/libpq.h
index b1152475ac..298d87ecae 100644
--- a/src/include/libpq/libpq.h
+++ b/src/include/libpq/libpq.h
@@ -88,6 +88,9 @@ extern PGDLLIMPORT bool ssl_passphrase_command_supports_reload;
 #ifdef USE_SSL
 extern bool ssl_loaded_verify_locations;
 #endif
+#ifdef USE_NSS
+extern char *ssl_database;
+#endif
 
 extern int	secure_initialize(bool isServerStart);
 extern bool secure_loaded_verify_locations(void);
diff --git a/src/include/pg_config.h.in b/src/include/pg_config.h.in
index fb270df678..31f808398c 100644
--- a/src/include/pg_config.h.in
+++ b/src/include/pg_config.h.in
@@ -893,6 +893,9 @@
 /* Define to 1 to build with PAM support. (--with-pam) */
 #undef USE_PAM
 
+/* Define to build with NSS support (--with-nss) */
+#undef USE_NSS
+
 /* Define to 1 to use software CRC-32C implementation (slicing-by-8). */
 #undef USE_SLICING_BY_8_CRC32C
 
diff --git a/src/include/pg_config_manual.h b/src/include/pg_config_manual.h
index 705dc69c06..c28b84126d 100644
--- a/src/include/pg_config_manual.h
+++ b/src/include/pg_config_manual.h
@@ -176,10 +176,9 @@
 
 /*
  * USE_SSL code should be compiled only when compiling with an SSL
- * implementation.  (Currently, only OpenSSL is supported, but we might add
- * more implementations in the future.)
+ * implementation.
  */
-#ifdef USE_OPENSSL
+#if defined(USE_OPENSSL) || defined(USE_NSS)
 #define USE_SSL
 #endif
 
diff --git a/src/interfaces/libpq/Makefile b/src/interfaces/libpq/Makefile
index 4ac5f4b340..e902f38c8e 100644
--- a/src/interfaces/libpq/Makefile
+++ b/src/interfaces/libpq/Makefile
@@ -45,12 +45,21 @@ OBJS = \
 	pqexpbuffer.o \
 	fe-auth.o
 
-ifeq ($(with_openssl),yes)
+ifneq ($(with_ssl),no)
+OBJS += \
+	fe-secure-common.o
+endif
+
+ifeq ($(with_ssl),openssl)
 OBJS += \
-	fe-secure-common.o \
 	fe-secure-openssl.o
 endif
 
+ifeq ($(with_ssl), nss)
+OBJS += \
+	fe-secure-nss.o
+endif
+
 ifeq ($(with_gssapi),yes)
 OBJS += \
 	fe-gssapi-common.o \
diff --git a/src/interfaces/libpq/fe-connect.c b/src/interfaces/libpq/fe-connect.c
index e7781d010f..8188401659 100644
--- a/src/interfaces/libpq/fe-connect.c
+++ b/src/interfaces/libpq/fe-connect.c
@@ -355,6 +355,10 @@ static const internalPQconninfoOption PQconninfoOptions[] = {
 		"Target-Session-Attrs", "", 11, /* sizeof("read-write") = 11 */
 	offsetof(struct pg_conn, target_session_attrs)},
 
+	{"cert_database", NULL, NULL, NULL,
+		"CertificateDatabase", "", 64,
+	offsetof(struct pg_conn, cert_database)},
+
 	/* Terminating entry --- MUST BE LAST */
 	{NULL, NULL, NULL, NULL,
 	NULL, NULL, 0}
diff --git a/src/interfaces/libpq/fe-secure-nss.c b/src/interfaces/libpq/fe-secure-nss.c
new file mode 100644
index 0000000000..53ac06de27
--- /dev/null
+++ b/src/interfaces/libpq/fe-secure-nss.c
@@ -0,0 +1,1105 @@
+/*-------------------------------------------------------------------------
+ *
+ * fe-secure-nss.c
+ *	  functions for supporting NSS as a TLS backend for frontend libpq
+ *
+ * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ *	  src/interfaces/libpq/fe-secure-nss.c
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#include "postgres_fe.h"
+
+#include "libpq-fe.h"
+#include "fe-auth.h"
+#include "fe-secure-common.h"
+#include "libpq-int.h"
+#include "common/pg_nss.h"
+
+/*
+ * BITS_PER_BYTE is also defined in the NSPR header files, so we need to undef
+ * our version to avoid compiler warnings on redefinition.
+ */
+#define pg_BITS_PER_BYTE BITS_PER_BYTE
+#undef BITS_PER_BYTE
+
+/*
+ * The nspr/obsolete/protypes.h NSPR header typedefs uint64 and int64 with
+ * colliding definitions from ours, causing a much expected compiler error.
+ * Remove backwards compatibility with ancient NSPR versions to avoid this.
+ */
+#define NO_NSPR_10_SUPPORT
+#include <nspr/nspr.h>
+#include <nspr/prerror.h>
+#include <nspr/prinit.h>
+#include <nspr/prio.h>
+#include <nss/hasht.h>
+#include <nss/nss.h>
+#include <nss/ssl.h>
+#include <nss/sslproto.h>
+#include <nss/pk11func.h>
+#include <nss/secerr.h>
+#include <nss/secoidt.h>
+#include <nss/secmod.h>
+
+/*
+ * Ensure that the colliding definitions match, else throw an error. In case
+ * NSPR remove the definition in a future version (however unlikely that may
+ * be, make sure to put ours back again.
+ */
+#if defined(BITS_PER_BYTE)
+#if BITS_PER_BYTE != pg_BITS_PER_BYTE
+#error "incompatible byte widths between NSPR and PostgreSQL"
+#endif
+#else
+#define BITS_PER_BYTE pg_BITS_PER_BYTE
+#endif
+#undef pg_BITS_PER_BYTE
+
+static SECStatus pg_load_nss_module(SECMODModule * *module, const char *library, const char *name);
+static SECStatus pg_bad_cert_handler(void *arg, PRFileDesc * fd);
+static const char *pg_SSLerrmessage(PRErrorCode errcode);
+static SECStatus pg_client_auth_handler(void *arg, PRFileDesc * socket, CERTDistNames * caNames,
+										CERTCertificate * *pRetCert, SECKEYPrivateKey * *pRetKey);
+static SECStatus pg_cert_auth_handler(void *arg, PRFileDesc * fd, PRBool checksig, PRBool isServer);
+static int	ssl_protocol_version_to_nss(const char *protocol);
+static bool cert_database_has_CA(PGconn *conn);
+
+static char *PQssl_passwd_cb(PK11SlotInfo * slot, PRBool retry, void *arg);
+
+/*
+ * PR_ImportTCPSocket() is a private API, but very widely used, as it's the
+ * only way to make NSS use an already set up POSIX file descriptor rather
+ * than opening one itself. To quote the NSS documentation:
+ *
+ *		"In theory, code that uses PR_ImportTCPSocket may break when NSPR's
+ *		implementation changes. In practice, this is unlikely to happen because
+ *		NSPR's implementation has been stable for years and because of NSPR's
+ *		strong commitment to backward compatibility."
+ *
+ * https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSPR/Reference/PR_ImportTCPSocket
+ *
+ * The function is declared in <private/pprio.h>, but as it is a header marked
+ * private we declare it here rather than including it.
+ */
+NSPR_API(PRFileDesc *) PR_ImportTCPSocket(int);
+
+static SECMODModule * ca_trust = NULL;
+static NSSInitContext * nss_context = NULL;
+
+/*
+ * This logic exist in NSS as well, but it's only available for when there is
+ * a database to open, and not only using the system trust store. Thus, we
+ * need to keep our own copy.
+ */
+#if defined(WIN32)
+static const char *ca_trust_name = "nssckbi.dll";
+#elif defined(__darwin__)
+static const char *ca_trust_name = "libnssckbi.dylib";
+#else
+static const char *ca_trust_name = "libnssckbi.so";
+#endif
+
+static PQsslKeyPassHook_nss_type PQsslKeyPassHook = NULL;
+
+/* ------------------------------------------------------------ */
+/*			 Procedures common to all secure sessions			*/
+/* ------------------------------------------------------------ */
+
+/*
+ * pgtls_init_library
+ *
+ * There is no direct equivalent for PQinitOpenSSL in NSS/NSPR, with PR_Init
+ * being the closest match there is. PR_Init is however already documented to
+ * not be required so simply making this a noop seems like the best option.
+ */
+void
+pgtls_init_library(bool do_ssl, int do_crypto)
+{
+	/* noop */
+}
+
+int
+pgtls_init(PGconn *conn)
+{
+	conn->ssl_in_use = false;
+	conn->has_password = false;
+
+	return 0;
+}
+
+void
+pgtls_close(PGconn *conn)
+{
+	if (nss_context)
+	{
+		NSS_ShutdownContext(nss_context);
+		nss_context = NULL;
+	}
+}
+
+PostgresPollingStatusType
+pgtls_open_client(PGconn *conn)
+{
+	SECStatus	status;
+	PRFileDesc *pr_fd;
+	PRFileDesc *model;
+	NSSInitParameters params;
+	SSLVersionRange desired_range;
+
+	/*
+	 * The NSPR documentation states that runtime initialization via PR_Init
+	 * is no longer required, as the first caller into NSPR will perform the
+	 * initialization implicitly. See be-secure-nss.c for further discussion
+	 * on PR_Init.
+	 */
+	PR_Init(PR_USER_THREAD, PR_PRIORITY_NORMAL, 0);
+
+	/*
+	 * NSS initialization and the use of contexts is further discussed in
+	 * be-secure-nss.c
+	 */
+	memset(&params, 0, sizeof(params));
+	params.length = sizeof(params);
+
+	if (conn->cert_database && strlen(conn->cert_database) > 0)
+	{
+		char	   *cert_database_path = psprintf("sql:%s", conn->cert_database);
+
+		nss_context = NSS_InitContext(cert_database_path, "", "", "",
+									  &params,
+									  NSS_INIT_READONLY | NSS_INIT_PK11RELOAD);
+		pfree(cert_database_path);
+
+		if (!nss_context)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("unable to open certificate database \"%s\": %s"),
+							  conn->cert_database,
+							  pg_SSLerrmessage(PR_GetError()));
+			return PGRES_POLLING_FAILED;
+		}
+	}
+	else
+	{
+		nss_context = NSS_InitContext("", "", "", "", &params,
+									  NSS_INIT_READONLY | NSS_INIT_NOCERTDB |
+									  NSS_INIT_NOMODDB | NSS_INIT_FORCEOPEN |
+									  NSS_INIT_NOROOTINIT | NSS_INIT_PK11RELOAD);
+		if (!nss_context)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("unable to create certificate database: %s"),
+							  pg_SSLerrmessage(PR_GetError()));
+			return PGRES_POLLING_FAILED;
+		}
+	}
+
+	/*
+	 * Configure cipher policy.
+	 */
+	status = NSS_SetDomesticPolicy();
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to configure cipher policy: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * If we don't have a certificate database, the system trust store is the
+	 * fallback we can use. If we fail to initialize that as well, we can
+	 * still attempt a connection as long as the sslmode isn't verify*.
+	 */
+	if (!conn->cert_database && conn->sslmode[0] == 'v')
+	{
+		status = pg_load_nss_module(&ca_trust, ca_trust_name, "\"Root Certificates\"");
+		if (status != SECSuccess)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("WARNING: unable to load NSS trust module \"%s\" : %s"),
+							  ca_trust_name,
+							  pg_SSLerrmessage(PR_GetError()));
+
+			return PGRES_POLLING_FAILED;
+		}
+	}
+
+
+	PK11_SetPasswordFunc(PQssl_passwd_cb);
+
+	/*
+	 * Import the already opened socket as we don't want to use NSPR functions
+	 * for opening the network socket due to how the PostgreSQL protocol works
+	 * with TLS connections. This function is not part of the NSPR public API,
+	 * see the comment at the top of the file for the rationale of still using
+	 * it.
+	 */
+	pr_fd = PR_ImportTCPSocket(conn->sock);
+	if (!pr_fd)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to attach to socket: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * Most of the documentation available, and implementations of, NSS/NSPR
+	 * use the PR_NewTCPSocket() function here, which has the drawback that it
+	 * can only create IPv4 sockets. Instead use PR_OpenTCPSocket() which
+	 * copes with IPv6 as well.
+	 */
+	model = SSL_ImportFD(NULL, PR_OpenTCPSocket(conn->laddr.addr.ss_family));
+	if (!model)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to enable TLS: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/* Disable old protocol versions (SSLv2 and SSLv3) */
+	SSL_OptionSet(model, SSL_ENABLE_SSL2, PR_FALSE);
+	SSL_OptionSet(model, SSL_V2_COMPATIBLE_HELLO, PR_FALSE);
+	SSL_OptionSet(model, SSL_ENABLE_SSL3, PR_FALSE);
+
+#ifdef SSL_CBC_RANDOM_IV
+
+	/*
+	 * Enable protection against the BEAST attack in case the NSS library has
+	 * support for that. While SSLv3 is disabled, we may still allow TLSv1
+	 * which is affected. The option isn't documented as an SSL option, but as
+	 * an NSS environment variable.
+	 */
+	SSL_OptionSet(model, SSL_CBC_RANDOM_IV, PR_TRUE);
+#endif
+
+	/* Set us up as a TLS client for the handshake */
+	SSL_OptionSet(model, SSL_HANDSHAKE_AS_CLIENT, PR_TRUE);
+
+	/*
+	 * When setting the available protocols, we either use the user defined
+	 * configuration values, and if missing we accept whatever is the highest
+	 * version supported by the library as the max and only limit the range in
+	 * the other end at TLSv1.0. ssl_variant_stream is a ProtocolVariant enum
+	 * for Stream protocols, rather than datagram.
+	 */
+	SSL_VersionRangeGetSupported(ssl_variant_stream, &desired_range);
+	desired_range.min = SSL_LIBRARY_VERSION_TLS_1_0;
+
+	if (conn->ssl_min_protocol_version && strlen(conn->ssl_min_protocol_version) > 0)
+	{
+		int			ssl_min_ver = ssl_protocol_version_to_nss(conn->ssl_min_protocol_version);
+
+		if (ssl_min_ver == -1)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("invalid value \"%s\" for minimum version of SSL protocol\n"),
+							  conn->ssl_min_protocol_version);
+			return -1;
+		}
+
+		desired_range.min = ssl_min_ver;
+	}
+
+	if (conn->ssl_max_protocol_version && strlen(conn->ssl_max_protocol_version) > 0)
+	{
+		int			ssl_max_ver = ssl_protocol_version_to_nss(conn->ssl_max_protocol_version);
+
+		if (ssl_max_ver == -1)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("invalid value \"%s\" for maximum version of SSL protocol\n"),
+							  conn->ssl_max_protocol_version);
+			return -1;
+		}
+
+		desired_range.max = ssl_max_ver;
+	}
+
+	if (SSL_VersionRangeSet(model, &desired_range) != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to set allowed SSL protocol version range: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * Set up callback for verifying server certificates, as well as for how
+	 * to handle failed verifications.
+	 */
+	SSL_AuthCertificateHook(model, pg_cert_auth_handler, (void *) conn);
+	SSL_BadCertHook(model, pg_bad_cert_handler, (void *) conn);
+
+	/*
+	 * Convert the NSPR socket to an SSL socket. Ensuring the success of this
+	 * operation is critical as NSS SSL_* functions may return SECSuccess on
+	 * the socket even though SSL hasn't been enabled, which introduce a risk
+	 * of silent downgrades.
+	 */
+	conn->pr_fd = SSL_ImportFD(model, pr_fd);
+	if (!conn->pr_fd)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to configure client for TLS: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * The model can now we closed as we've applied the settings of the model
+	 * onto the real socket. From hereon we should only use conn->pr_fd.
+	 */
+	PR_Close(model);
+
+	/* Set the private data to be passed to the password callback */
+	SSL_SetPKCS11PinArg(conn->pr_fd, (void *) conn);
+
+	/*
+	 * If a CRL file has been specified, verify if it exists in the database
+	 * but don't fail in case it doesn't.
+	 */
+	if (conn->sslcrl && strlen(conn->sslcrl) > 0)
+	{
+		/* XXX: Implement me.. */
+	}
+
+	status = SSL_ResetHandshake(conn->pr_fd, PR_FALSE);
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to initiate handshake: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * Set callback for client authentication when requested by the server.
+	 */
+	SSL_GetClientAuthDataHook(conn->pr_fd, pg_client_auth_handler, (void *) conn);
+
+	/*
+	 * Specify which hostname we are expecting to talk to. This is required,
+	 * albeit mostly applies to when opening a connection to a traditional
+	 * http server it seems.
+	 */
+	SSL_SetURL(conn->pr_fd, (conn->connhost[conn->whichhost]).host);
+
+	do
+	{
+		status = SSL_ForceHandshake(conn->pr_fd);
+	}
+	while (status != SECSuccess && PR_GetError() == PR_WOULD_BLOCK_ERROR);
+
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("SSL error: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	conn->ssl_in_use = true;
+	return PGRES_POLLING_OK;
+}
+
+ssize_t
+pgtls_read(PGconn *conn, void *ptr, size_t len)
+{
+	PRInt32		nread;
+	PRErrorCode status;
+	int			read_errno = 0;
+
+	/*
+	 * PR_Recv blocks until there is data to read or the timeout expires. We
+	 * don't want to sit blocked here, so the timeout is turned off by using
+	 * PR_INTERVAL_NO_WAIT which means "return immediately",  Zero is returned
+	 * for closed connections, while -1 indicates an error within the ongoing
+	 * connection.
+	 */
+	nread = PR_Recv(conn->pr_fd, ptr, len, 0, PR_INTERVAL_NO_WAIT);
+
+	if (nread == 0)
+	{
+		read_errno = ECONNRESET;
+		nread = -1;
+	}
+	else if (nread == -1)
+	{
+		status = PR_GetError();
+
+		switch (status)
+		{
+			case PR_IO_TIMEOUT_ERROR:
+				/* No data available yet. */
+				nread = 0;
+				break;
+
+			case PR_WOULD_BLOCK_ERROR:
+				read_errno = EWOULDBLOCK;
+				break;
+
+				/*
+				 * The error cases for PR_Recv are not documented, but can be
+				 * reverse engineered from _MD_unix_map_default_error() in the
+				 * NSPR code, defined in pr/src/md/unix/unix_errors.c.
+				 */
+			case PR_NETWORK_UNREACHABLE_ERROR:
+			case PR_CONNECT_RESET_ERROR:
+				read_errno = ECONNRESET;
+				break;
+
+			default:
+				break;
+		}
+
+		if (nread == -1)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("TLS read error: %s"),
+							  pg_SSLerrmessage(status));
+		}
+	}
+
+	SOCK_ERRNO_SET(read_errno);
+	return (ssize_t) nread;
+}
+
+/*
+ * pgtls_read_pending
+ *		Check for the existence of data to be read.
+ *
+ * This is part of the PostgreSQL TLS backend API.
+ */
+bool
+pgtls_read_pending(PGconn *conn)
+{
+	unsigned char c;
+	int			n;
+
+	/*
+	 * PR_Recv peeks into the stream with the timeount turned off, to see if
+	 * there is another byte to read off the wire. There is an NSS function
+	 * SSL_DataPending() which might seem like a better fit, but it will only
+	 * check already encrypted data in the SSL buffer, not still unencrypted
+	 * data, thus it doesn't guarantee that a subsequent call to
+	 * PR_Read/PR_Recv won't block.
+	 */
+	n = PR_Recv(conn->pr_fd, &c, 1, PR_MSG_PEEK, PR_INTERVAL_NO_WAIT);
+	return (n > 0);
+}
+
+ssize_t
+pgtls_write(PGconn *conn, const void *ptr, size_t len)
+{
+	PRInt32		n;
+	PRErrorCode status;
+	int			write_errno = 0;
+
+	n = PR_Write(conn->pr_fd, ptr, len);
+
+	if (n < 0)
+	{
+		status = PR_GetError();
+
+		switch (status)
+		{
+			case PR_WOULD_BLOCK_ERROR:
+#ifdef EAGAIN
+				write_errno = EAGAIN;
+#else
+				write_errno = EINTR;
+#endif
+				break;
+
+			default:
+				printfPQExpBuffer(&conn->errorMessage,
+								  libpq_gettext("TLS write error: %s"),
+								  pg_SSLerrmessage(status));
+				write_errno = ECONNRESET;
+				break;
+		}
+	}
+
+	SOCK_ERRNO_SET(write_errno);
+	return (ssize_t) n;
+}
+
+char *
+pgtls_get_peer_certificate_hash(PGconn *conn, size_t *len)
+{
+	CERTCertificate *server_cert;
+	SECOidTag	signature_alg;
+	SECOidTag	digest_alg;
+	int			digest_len;
+	const NSSSignatureAlgorithms *candidate;
+	PLArenaPool *arena;
+	SECItem		digest;
+	char	   *ret;
+	SECStatus	status;
+
+	*len = 0;
+
+	server_cert = SSL_PeerCertificate(conn->pr_fd);
+	if (!server_cert)
+		return NULL;
+
+	signature_alg = SECOID_GetAlgorithmTag(&server_cert->signature);
+
+	candidate = NSS_SCRAMDigestAlgorithm;
+	while (candidate->signature)
+	{
+		if (signature_alg == candidate->signature)
+		{
+			digest_alg = candidate->hash;
+			digest_len = candidate->len;
+			break;
+		}
+
+		candidate++;
+	}
+
+	if (!candidate->signature)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("could not find digest for OID '%s'\n"),
+						  SECOID_FindOIDTagDescription(signature_alg));
+		return NULL;
+	}
+
+	arena = PORT_NewArena(SEC_ASN1_DEFAULT_ARENA_SIZE);
+	digest.data = PORT_ArenaZAlloc(arena, sizeof(unsigned char) * digest_len);
+	digest.len = digest_len;
+
+	status = PK11_HashBuf(digest_alg, digest.data, server_cert->derCert.data,
+						  server_cert->derCert.len);
+
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to generate peer certificate digest: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		PORT_FreeArena(arena, PR_TRUE);
+		return NULL;
+	}
+
+	ret = pg_malloc(digest.len);
+	memcpy(ret, digest.data, digest.len);
+	*len = digest_len;
+	PORT_FreeArena(arena, PR_TRUE);
+
+	return ret;
+}
+
+/*
+ *	Verify that the server certificate matches the hostname we connected to.
+ *
+ * The certificate's Common Name and Subject Alternative Names are considered.
+ */
+int
+pgtls_verify_peer_name_matches_certificate_guts(PGconn *conn,
+												int *names_examined,
+												char **first_name)
+{
+	char	   *server_hostname = NULL;
+	CERTCertificate *server_cert = NULL;
+	SECStatus	status = SECSuccess;
+	SECItem		altname_item;
+	PLArenaPool *arena = NULL;
+	CERTGeneralName *san_list;
+	CERTGeneralName *cn;
+
+	server_hostname = SSL_RevealURL(conn->pr_fd);
+	if (!server_hostname || server_hostname[0] == '\0')
+		goto done;
+
+	/*
+	 * CERT_VerifyCertName will internally perform RFC 2818 SubjectAltName
+	 * verification.
+	 */
+	server_cert = SSL_PeerCertificate(conn->pr_fd);
+	status = CERT_VerifyCertName(server_cert, server_hostname);
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to verify server hostname: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		goto done;
+	}
+
+	status = CERT_FindCertExtension(server_cert, SEC_OID_X509_SUBJECT_ALT_NAME,
+									&altname_item);
+	if (status == SECSuccess)
+	{
+		arena = PORT_NewArena(DER_DEFAULT_CHUNKSIZE);
+		if (!arena)
+		{
+			status = SECFailure;
+			goto done;
+		}
+		san_list = CERT_DecodeAltNameExtension(arena, &altname_item);
+		if (!san_list)
+		{
+			status = SECFailure;
+			goto done;
+		}
+
+		for (cn = san_list; cn != san_list; cn = CERT_GetNextGeneralName(cn))
+		{
+			char	   *alt_name;
+			int			rv;
+			char		tmp[512];
+
+			status = CERT_RFC1485_EscapeAndQuote(tmp, sizeof(tmp),
+												 (char *) cn->name.other.data,
+												 cn->name.other.len);
+
+			if (status != SECSuccess)
+				goto done;
+
+			rv = pq_verify_peer_name_matches_certificate_name(conn, tmp,
+															  strlen(tmp),
+															  &alt_name);
+			if (alt_name)
+			{
+				if (!*first_name)
+					*first_name = alt_name;
+				else
+					free(alt_name);
+			}
+
+			if (rv == 1)
+				status = SECSuccess;
+			else
+			{
+				status = SECFailure;
+				break;
+			}
+		}
+	}
+	else if (PORT_GetError() == SEC_ERROR_EXTENSION_NOT_FOUND)
+		status = SECSuccess;
+	else
+		status = SECSuccess;
+
+done:
+	/* san_list will be freed by freeing the arena it was allocated in */
+	if (arena)
+		PORT_FreeArena(arena, PR_TRUE);
+	PR_Free(server_hostname);
+
+	if (status == SECSuccess)
+		return 1;
+
+	return 0;
+}
+
+/* ------------------------------------------------------------ */
+/*			PostgreSQL specific TLS support functions			*/
+/* ------------------------------------------------------------ */
+
+static const char *
+pg_SSLerrmessage(PRErrorCode errcode)
+{
+	const char *error;
+
+	/*
+	 * Try to get the user friendly error description, and if that fails try
+	 * to fall back on the name of the PRErrorCode.
+	 */
+	error = PR_ErrorToString(errcode, PR_LANGUAGE_I_DEFAULT);
+	if (!error)
+		error = PR_ErrorToName(errcode);
+	if (error)
+		return error;
+
+	return "unknown TLS error";
+}
+
+static SECStatus
+pg_load_nss_module(SECMODModule * *module, const char *library, const char *name)
+{
+	SECMODModule *mod;
+	char	   *modulespec;
+
+	modulespec = psprintf("library=\"%s\", name=\"%s\"", library, name);
+
+	/*
+	 * Attempt to load the specified module. The second parameter is "parent"
+	 * which should always be NULL for application code. The third parameter
+	 * defines if loading should recurse which is only applicable when loading
+	 * a module from within another module. This hierarchy would have to be
+	 * defined in the modulespec, and since we don't support anything but
+	 * directly addressed modules we should pass PR_FALSE.
+	 */
+	mod = SECMOD_LoadUserModule(modulespec, NULL, PR_FALSE);
+	pfree(modulespec);
+
+	if (mod && mod->loaded)
+	{
+		*module = mod;
+		return SECSuccess;
+	}
+
+	SECMOD_DestroyModule(mod);
+	return SECFailure;
+}
+
+/* ------------------------------------------------------------ */
+/*						NSS Callbacks							*/
+/* ------------------------------------------------------------ */
+
+/*
+ * pg_cert_auth_handler
+ *			Callback for authenticating server certificate
+ *
+ * This is pretty much the same procedure as the SSL_AuthCertificate function
+ * provided by NSS, with the difference being server hostname validation. With
+ * SSL_AuthCertificate there is no way to do verify-ca, it only does the -full
+ * flavor of our sslmodes, so we need our own implementation.
+ */
+static SECStatus
+pg_cert_auth_handler(void *arg, PRFileDesc *fd, PRBool checksig, PRBool isServer)
+{
+	SECStatus	status;
+	PGconn	   *conn = (PGconn *) arg;
+	CERTCertificate *server_cert;
+	void	   *pin;
+
+	Assert(!isServer);
+
+	pin = SSL_RevealPinArg(conn->pr_fd);
+	server_cert = SSL_PeerCertificate(conn->pr_fd);
+
+	status = CERT_VerifyCertificateNow((CERTCertDBHandle *) CERT_GetDefaultCertDB(),
+									   server_cert,
+									   checksig,
+									   certificateUsageSSLServer,
+									   pin,
+									   NULL);
+
+	/*
+	 * If we've already failed validation then there is no point in also
+	 * performing the hostname check for verify-full.
+	 */
+	if (status == SECSuccess)
+	{
+		if (!pq_verify_peer_name_matches_certificate(conn))
+			status = SECFailure;
+	}
+	else
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to verify certificate: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+	}
+
+	return status;
+}
+
+/*
+ * pg_client_auth_handler
+ *		Callback for client certificate validation
+ *
+ * The client auth callback is not on by default in NSS, so we need to invoke
+ * it ourselves to ensure we can do cert authentication. A TODO is to support
+ * running without a specified sslcert parameter. By retrieving all the certs
+ * via nickname from the cert database and see if we find one which apply with
+ * NSS_CmpCertChainWCANames() and PK11_FindKeyByAnyCert() we could support
+ * just running with a ssl database specified.
+ *
+ * For now, we use the default client certificate validation which requires a
+ * defined nickname to identify the cert in the database.
+ */
+static SECStatus
+pg_client_auth_handler(void *arg, PRFileDesc * socket, CERTDistNames * caNames,
+					   CERTCertificate * *pRetCert, SECKEYPrivateKey * *pRetKey)
+{
+	PGconn	   *conn = (PGconn *) arg;
+
+	return NSS_GetClientAuthData(conn->sslcert, socket, caNames, pRetCert, pRetKey);
+}
+
+/*
+ * pg_bad_cert_handler
+ *		Callback for failed certificate validation
+ *
+ * The TLS handshake will call this function iff the server certificate failed
+ * validation. Depending on the sslmode, we allow the connection anyways.
+ */
+static SECStatus
+pg_bad_cert_handler(void *arg, PRFileDesc * fd)
+{
+	PGconn	   *conn = (PGconn *) arg;
+	PRErrorCode err;
+
+	/*
+	 * This really shouldn't happen, as we've set the PGconn object as our
+	 * callback data, and at the callsite we know it will be populated. That
+	 * being said, the NSS code itself performs this check even when it should
+	 * not be required so let's use the same belts with our suspenders.
+	 */
+	if (!arg)
+		return SECFailure;
+
+	/*
+	 * For sslmodes other than verify-full and verify-ca we don't perform peer
+	 * validation, so return immediately.  sslmode require with a database
+	 * specified which contains a CA certificate will work like verify-ca to
+	 * be compatible with the OpenSSL implementation.
+	 */
+	if (strcmp(conn->sslmode, "require") == 0)
+	{
+		if (conn->cert_database && strlen(conn->cert_database) > 0 && cert_database_has_CA(conn))
+			return SECFailure;
+	}
+	if (conn->sslmode[0] == 'v')
+		return SECFailure;
+
+	err = PORT_GetError();
+
+	/*
+	 * TODO: these are relevant error codes that can occur in certificate
+	 * validation, figure out which we don't want for require/prefer etc.
+	 */
+	switch (err)
+	{
+		case SEC_ERROR_INVALID_AVA:
+		case SEC_ERROR_INVALID_TIME:
+		case SEC_ERROR_BAD_SIGNATURE:
+		case SEC_ERROR_EXPIRED_CERTIFICATE:
+		case SEC_ERROR_UNKNOWN_ISSUER:
+		case SEC_ERROR_UNTRUSTED_ISSUER:
+		case SEC_ERROR_UNTRUSTED_CERT:
+		case SEC_ERROR_CERT_VALID:
+		case SEC_ERROR_EXPIRED_ISSUER_CERTIFICATE:
+		case SEC_ERROR_CRL_EXPIRED:
+		case SEC_ERROR_CRL_BAD_SIGNATURE:
+		case SEC_ERROR_EXTENSION_VALUE_INVALID:
+		case SEC_ERROR_CA_CERT_INVALID:
+		case SEC_ERROR_CERT_USAGES_INVALID:
+		case SEC_ERROR_UNKNOWN_CRITICAL_EXTENSION:
+			return SECSuccess;
+			break;
+		default:
+			return SECFailure;
+			break;
+	}
+
+	/* Unreachable */
+	return SECSuccess;
+}
+
+/* ------------------------------------------------------------ */
+/*					SSL information functions					*/
+/* ------------------------------------------------------------ */
+
+/*
+ * PQgetssl
+ *
+ * Return NULL as this is legacy and defined to always be equal to calling
+ * PQsslStruct(conn, "OpenSSL"); This should ideally trigger a logged warning
+ * somewhere as it's nonsensical to run in a non-OpenSSL build, but the color
+ * of said bikeshed hasn't yet been determined.
+ */
+void *
+PQgetssl(PGconn *conn)
+{
+	return NULL;
+}
+
+void *
+PQsslStruct(PGconn *conn, const char *struct_name)
+{
+	if (!conn)
+		return NULL;
+
+	/*
+	 * Return the underlying PRFileDesc which can be used to access
+	 * information on the connection details. There is no SSL context per se.
+	 */
+	if (strcmp(struct_name, "NSS") == 0)
+		return conn->pr_fd;
+	return NULL;
+}
+
+const char *const *
+PQsslAttributeNames(PGconn *conn)
+{
+	static const char *const result[] = {
+		"library",
+		"cipher",
+		"protocol",
+		"key_bits",
+		"compression",
+		NULL
+	};
+
+	return result;
+}
+
+const char *
+PQsslAttribute(PGconn *conn, const char *attribute_name)
+{
+	SECStatus	status;
+	SSLChannelInfo channel;
+	SSLCipherSuiteInfo suite;
+
+	if (!conn || !conn->pr_fd)
+		return NULL;
+
+	if (strcmp(attribute_name, "library") == 0)
+		return "NSS";
+
+	status = SSL_GetChannelInfo(conn->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+		return NULL;
+
+	status = SSL_GetCipherSuiteInfo(channel.cipherSuite, &suite, sizeof(suite));
+	if (status != SECSuccess)
+		return NULL;
+
+	if (strcmp(attribute_name, "cipher") == 0)
+		return suite.cipherSuiteName;
+
+	if (strcmp(attribute_name, "key_bits") == 0)
+	{
+		static char key_bits_str[8];
+
+		snprintf(key_bits_str, sizeof(key_bits_str), "%i", suite.effectiveKeyBits);
+		return key_bits_str;
+	}
+
+	if (strcmp(attribute_name, "protocol") == 0)
+	{
+		switch (channel.protocolVersion)
+		{
+#ifdef SSL_LIBRARY_VERSION_TLS_1_3
+			case SSL_LIBRARY_VERSION_TLS_1_3:
+				return "TLSv1.3";
+#endif
+#ifdef SSL_LIBRARY_VERSION_TLS_1_2
+			case SSL_LIBRARY_VERSION_TLS_1_2:
+				return "TLSv1.2";
+#endif
+#ifdef SSL_LIBRARY_VERSION_TLS_1_1
+			case SSL_LIBRARY_VERSION_TLS_1_1:
+				return "TLSv1.1";
+#endif
+			case SSL_LIBRARY_VERSION_TLS_1_0:
+				return "TLSv1.0";
+			default:
+				return "unknown";
+		}
+	}
+
+	/*
+	 * NSS disabled support for compression in version 3.33, and it was only
+	 * available for SSLv3 at that point anyways, so we can safely return off
+	 * here without checking.
+	 */
+	if (strcmp(attribute_name, "compression") == 0)
+		return "off";
+
+	return NULL;
+}
+
+static int
+ssl_protocol_version_to_nss(const char *protocol)
+{
+	if (pg_strcasecmp("TLSv1", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_0;
+
+#ifdef SSL_LIBRARY_VERSION_TLS_1_1
+	if (pg_strcasecmp("TLSv1.1", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_1;
+#endif
+
+#ifdef SSL_LIBRARY_VERSION_TLS_1_2
+	if (pg_strcasecmp("TLSv1.2", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_2;
+#endif
+
+#ifdef SSL_LIBRARY_VERSION_TLS_1_3
+	if (pg_strcasecmp("TLSv1.3", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_3;
+#endif
+
+	return -1;
+}
+
+static bool
+cert_database_has_CA(PGconn *conn)
+{
+	CERTCertList *certificates;
+	bool		hasCA;
+
+	/*
+	 * If the certificate database has a password we must provide it, since
+	 * this API doesn't invoke the standard password callback.
+	 */
+	if (conn->has_password)
+		certificates = PK11_ListCerts(PK11CertListCA, PQssl_passwd_cb(NULL, PR_FALSE, (void *) conn));
+	else
+		certificates = PK11_ListCerts(PK11CertListCA, NULL);
+	hasCA = !CERT_LIST_EMPTY(certificates);
+	CERT_DestroyCertList(certificates);
+
+	return hasCA;
+}
+
+PQsslKeyPassHook_nss_type
+PQgetSSLKeyPassHook_nss(void)
+{
+	return PQsslKeyPassHook;
+}
+
+void
+PQsetSSLKeyPassHook_nss(PQsslKeyPassHook_nss_type hook)
+{
+	PQsslKeyPassHook = hook;
+}
+
+/*
+ * Supply a password to decrypt a client certificate.
+ *
+ * This must match NSS type PK11PasswordFunc.
+ */
+static char *
+PQssl_passwd_cb(PK11SlotInfo * slot, PRBool retry, void *arg)
+{
+	PGconn	   *conn = (PGconn *) arg;
+
+	conn->has_password = true;
+
+	if (PQsslKeyPassHook)
+		return PQsslKeyPassHook(slot, (PRBool) retry, arg);
+	else
+		return PQdefaultSSLKeyPassHook_nss(slot, retry, arg);
+}
+
+/*
+ * The default password handler callback.
+ */
+char *
+PQdefaultSSLKeyPassHook_nss(PK11SlotInfo * slot, PRBool retry, void *arg)
+{
+	PGconn	   *conn = (PGconn *) arg;
+
+	/*
+	 * If the password didn't work the first time there is no point in
+	 * retrying as it hasn't changed.
+	 */
+	if (retry != PR_TRUE && conn->sslpassword && strlen(conn->sslpassword) > 0)
+		return PORT_Strdup(conn->sslpassword);
+
+	return NULL;
+}
diff --git a/src/interfaces/libpq/fe-secure.c b/src/interfaces/libpq/fe-secure.c
index 97c3805303..ff3b7c2aa6 100644
--- a/src/interfaces/libpq/fe-secure.c
+++ b/src/interfaces/libpq/fe-secure.c
@@ -427,6 +427,9 @@ PQsslAttributeNames(PGconn *conn)
 
 	return result;
 }
+#endif							/* USE_SSL */
+
+#ifndef USE_OPENSSL
 
 PQsslKeyPassHook_OpenSSL_type
 PQgetSSLKeyPassHook_OpenSSL(void)
@@ -445,7 +448,7 @@ PQdefaultSSLKeyPassHook_OpenSSL(char *buf, int size, PGconn *conn)
 {
 	return 0;
 }
-#endif							/* USE_SSL */
+#endif							/* USE_OPENSSL */
 
 /* Dummy version of GSSAPI information functions, when built without GSS support */
 #ifndef ENABLE_GSS
diff --git a/src/interfaces/libpq/libpq-fe.h b/src/interfaces/libpq/libpq-fe.h
index 3b6a9fbce3..27c16e187f 100644
--- a/src/interfaces/libpq/libpq-fe.h
+++ b/src/interfaces/libpq/libpq-fe.h
@@ -625,6 +625,17 @@ extern PQsslKeyPassHook_OpenSSL_type PQgetSSLKeyPassHook_OpenSSL(void);
 extern void PQsetSSLKeyPassHook_OpenSSL(PQsslKeyPassHook_OpenSSL_type hook);
 extern int	PQdefaultSSLKeyPassHook_OpenSSL(char *buf, int size, PGconn *conn);
 
+/* == in fe-secure-nss.c === */
+typedef struct PK11SlotInfoStr PK11SlotInfo;
+typedef int PRIntn;
+typedef PRIntn PRBool;
+
+/* Support for overriding sslpassword handling with a callback. */
+typedef char *(*PQsslKeyPassHook_nss_type) (PK11SlotInfo * slot, PRBool retry, void *arg);
+extern PQsslKeyPassHook_nss_type PQgetSSLKeyPassHook_nss(void);
+extern void PQsetSSLKeyPassHook_nss(PQsslKeyPassHook_nss_type hook);
+extern char *PQdefaultSSLKeyPassHook_nss(PK11SlotInfo * slot, PRBool retry, void *arg);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/src/interfaces/libpq/libpq-int.h b/src/interfaces/libpq/libpq-int.h
index 1de91ae295..96d7f3f534 100644
--- a/src/interfaces/libpq/libpq-int.h
+++ b/src/interfaces/libpq/libpq-int.h
@@ -362,6 +362,7 @@ struct pg_conn
 	char	   *sslpassword;	/* client key file password */
 	char	   *sslrootcert;	/* root certificate filename */
 	char	   *sslcrl;			/* certificate revocation list filename */
+	char	   *cert_database;	/* NSS certificate/key database */
 	char	   *requirepeer;	/* required peer credentials for local sockets */
 	char	   *gssencmode;		/* GSS mode (require,prefer,disable) */
 	char	   *krbsrvname;		/* Kerberos service name */
@@ -485,6 +486,23 @@ struct pg_conn
 								 * OpenSSL version changes */
 #endif
 #endif							/* USE_OPENSSL */
+
+#ifdef USE_NSS
+	void	   *pr_fd;			/* NSPR file descriptor for the connection */
+
+	/*
+	 * Track whether the NSS database has a password set or not. There is no
+	 * API function for retrieving password status of a database, but we need
+	 * to know since some NSS API calls require the password passed in (they
+	 * don't call the callback themselves). To track, we simply flip this to
+	 * true in case NSS invoked the password callback - as that will only
+	 * happen in case there is a password. The reason for tracking this is
+	 * that there are calls which require a password parameter, but doesn't
+	 * use the callbacks provided, so we must call the callback on behalf of
+	 * these.
+	 */
+	bool		has_password;
+#endif							/* USE_NSS */
 #endif							/* USE_SSL */
 
 #ifdef ENABLE_GSS
@@ -755,7 +773,7 @@ extern ssize_t pgtls_write(PGconn *conn, const void *ptr, size_t len);
  * This is not supported with old versions of OpenSSL that don't have
  * the X509_get_signature_nid() function.
  */
-#if defined(USE_OPENSSL) && defined(HAVE_X509_GET_SIGNATURE_NID)
+#if defined(USE_NSS) || (defined(USE_OPENSSL) && defined(HAVE_X509_GET_SIGNATURE_NID))
 #define HAVE_PGTLS_GET_PEER_CERTIFICATE_HASH
 extern char *pgtls_get_peer_certificate_hash(PGconn *conn, size_t *len);
 #endif
diff --git a/src/tools/msvc/Mkvcbuild.pm b/src/tools/msvc/Mkvcbuild.pm
index 90594bd41b..29879b51af 100644
--- a/src/tools/msvc/Mkvcbuild.pm
+++ b/src/tools/msvc/Mkvcbuild.pm
@@ -192,12 +192,19 @@ sub mkvcbuild
 	$postgres->FullExportDLL('postgres.lib');
 
 	# The OBJS scraper doesn't know about ifdefs, so remove appropriate files
-	# if building without OpenSSL.
-	if (!$solution->{options}->{openssl})
+	# if building without various options.
+	if (!$solution->{options}->{openssl} && !$solution->{options}->{nss})
 	{
 		$postgres->RemoveFile('src/backend/libpq/be-secure-common.c');
+	}
+	if (!$solution->{options}->{openssl})
+	{
 		$postgres->RemoveFile('src/backend/libpq/be-secure-openssl.c');
 	}
+	if (!$solution->{options}->{nss})
+	{
+		$postgres->RemoveFile('src/backend/libpq/be-secure-nss.c');
+	}
 	if (!$solution->{options}->{gss})
 	{
 		$postgres->RemoveFile('src/backend/libpq/be-gssapi-common.c');
@@ -255,12 +262,19 @@ sub mkvcbuild
 	$libpq->AddReference($libpgcommon, $libpgport);
 
 	# The OBJS scraper doesn't know about ifdefs, so remove appropriate files
-	# if building without OpenSSL.
-	if (!$solution->{options}->{openssl})
+	# if building without various options
+	if (!$solution->{options}->{openssl} && !$solution->{options}->{nss})
 	{
 		$libpq->RemoveFile('src/interfaces/libpq/fe-secure-common.c');
+	}
+	if (!$solution->{options}->{openssl})
+	{
 		$libpq->RemoveFile('src/interfaces/libpq/fe-secure-openssl.c');
 	}
+	if (!$solution->{options}->{nss})
+	{
+		$libpq->RemoveFile('src/interfaces/libpq/fe-secure-nss.c');
+	}
 	if (!$solution->{options}->{gss})
 	{
 		$libpq->RemoveFile('src/interfaces/libpq/fe-gssapi-common.c');
diff --git a/src/tools/msvc/Solution.pm b/src/tools/msvc/Solution.pm
index 17e480546c..be6df4758a 100644
--- a/src/tools/msvc/Solution.pm
+++ b/src/tools/msvc/Solution.pm
@@ -484,6 +484,7 @@ sub GenerateFiles
 		USE_NAMED_POSIX_SEMAPHORES => undef,
 		USE_OPENSSL                => undef,
 		USE_OPENSSL_RANDOM         => undef,
+		USE_NSS                    => undef,
 		USE_PAM                    => undef,
 		USE_SLICING_BY_8_CRC32C    => undef,
 		USE_SSE42_CRC32C           => undef,
@@ -537,6 +538,10 @@ sub GenerateFiles
 			$define{HAVE_OPENSSL_INIT_SSL}      = 1;
 		}
 	}
+	if ($self->{options}->{nss})
+	{
+		$define{USE_NSS} = 1;
+	}
 
 	$self->GenerateConfigHeader('src/include/pg_config.h',     \%define, 1);
 	$self->GenerateConfigHeader('src/include/pg_config_ext.h', \%define, 0);
@@ -1002,6 +1007,21 @@ sub AddProject
 			}
 		}
 	}
+	if ($self->{options}->{nss})
+	{
+		$proj->AddIncludeDir($self->{options}->{nss} . '\..\public\nss');
+		$proj->AddIncludeDir($self->{options}->{nss} . '\include\nspr');
+		foreach my $lib (qw(plds4 plc4 nspr4))
+		{
+			$proj->AddLibrary($self->{options}->{nss} .
+							  '\lib\lib' . "$lib.lib", 0);
+		}
+		foreach my $lib (qw(ssl3 smime3 nss3))
+		{
+			$proj->AddLibrary($self->{options}->{nss} .
+							  '\lib' . "\\$lib.dll.lib", 0);
+		}
+	}
 	if ($self->{options}->{nls})
 	{
 		$proj->AddIncludeDir($self->{options}->{nls} . '\include');
diff --git a/src/tools/msvc/config_default.pl b/src/tools/msvc/config_default.pl
index 2ef2cfc4e9..49dc4d5864 100644
--- a/src/tools/msvc/config_default.pl
+++ b/src/tools/msvc/config_default.pl
@@ -17,6 +17,7 @@ our $config = {
 	perl      => undef,    # --with-perl=<path>
 	python    => undef,    # --with-python=<path>
 	openssl   => undef,    # --with-openssl=<path>
+	nss       => undef,    # --with-nss=<path>
 	uuid      => undef,    # --with-uuid=<path>
 	xml       => undef,    # --with-libxml=<path>
 	xslt      => undef,    # --with-libxslt=<path>
-- 
2.21.1 (Apple Git-122.3)

From 78c1cf721cce7bc2291d061e4af6dc9eccf58fd9 Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Wed, 28 Oct 2020 11:22:26 +0100
Subject: [PATCH v20 2/5] NSS Testharness updates

TODO:
	* Generate certificate/keys with NSS tooling for NSS specific test
	* Add test for certificate with embedded nulls
	* Fix SCRAM tests when channel binding works
---
 src/test/Makefile                             |   2 +-
 src/test/modules/Makefile                     |   2 +-
 .../modules/ssl_passphrase_callback/Makefile  |   2 +-
 .../ssl_passphrase_callback/t/001_testfunc.pl |   4 +-
 src/test/ssl/Makefile                         | 177 +++++++++-
 src/test/ssl/t/001_ssltests.pl                | 328 ++++++++++--------
 src/test/ssl/t/002_scram.pl                   |  97 ++++--
 src/test/ssl/t/SSL/Backend/NSS.pm             |  64 ++++
 src/test/ssl/t/SSL/Backend/OpenSSL.pm         | 103 ++++++
 .../ssl/t/{SSLServer.pm => SSL/Server.pm}     |  80 ++++-
 10 files changed, 664 insertions(+), 195 deletions(-)
 create mode 100644 src/test/ssl/t/SSL/Backend/NSS.pm
 create mode 100644 src/test/ssl/t/SSL/Backend/OpenSSL.pm
 rename src/test/ssl/t/{SSLServer.pm => SSL/Server.pm} (78%)

diff --git a/src/test/Makefile b/src/test/Makefile
index 14cde4f5ba..1b6876ca18 100644
--- a/src/test/Makefile
+++ b/src/test/Makefile
@@ -28,7 +28,7 @@ ifneq (,$(filter ldap,$(PG_TEST_EXTRA)))
 SUBDIRS += ldap
 endif
 endif
-ifeq ($(with_openssl),yes)
+ifeq ($(with_ssl),yes)
 ifneq (,$(filter ssl,$(PG_TEST_EXTRA)))
 SUBDIRS += ssl
 endif
diff --git a/src/test/modules/Makefile b/src/test/modules/Makefile
index a6d2ffbf9e..6e6ca97d95 100644
--- a/src/test/modules/Makefile
+++ b/src/test/modules/Makefile
@@ -27,7 +27,7 @@ SUBDIRS = \
 		  unsafe_tests \
 		  worker_spi
 
-ifeq ($(with_openssl),yes)
+ifeq ($(with_ssl),openssl)
 SUBDIRS += ssl_passphrase_callback
 else
 ALWAYS_SUBDIRS += ssl_passphrase_callback
diff --git a/src/test/modules/ssl_passphrase_callback/Makefile b/src/test/modules/ssl_passphrase_callback/Makefile
index f81265c296..a34d7ea46a 100644
--- a/src/test/modules/ssl_passphrase_callback/Makefile
+++ b/src/test/modules/ssl_passphrase_callback/Makefile
@@ -1,6 +1,6 @@
 # ssl_passphrase_callback Makefile
 
-export with_openssl
+export with_ssl
 
 MODULE_big = ssl_passphrase_func
 OBJS = ssl_passphrase_func.o $(WIN32RES)
diff --git a/src/test/modules/ssl_passphrase_callback/t/001_testfunc.pl b/src/test/modules/ssl_passphrase_callback/t/001_testfunc.pl
index dbc084f870..a2bed5336c 100644
--- a/src/test/modules/ssl_passphrase_callback/t/001_testfunc.pl
+++ b/src/test/modules/ssl_passphrase_callback/t/001_testfunc.pl
@@ -7,9 +7,9 @@ use TestLib;
 use Test::More;
 use PostgresNode;
 
-unless (($ENV{with_openssl} || 'no') eq 'yes')
+unless ($ENV{with_ssl} eq 'openssl')
 {
-	plan skip_all => 'SSL not supported by this build';
+	plan skip_all => 'OpenSSL not supported by this build';
 }
 
 my $clearpass = "FooBaR1";
diff --git a/src/test/ssl/Makefile b/src/test/ssl/Makefile
index 777ee39413..21a654b8a9 100644
--- a/src/test/ssl/Makefile
+++ b/src/test/ssl/Makefile
@@ -13,7 +13,7 @@ subdir = src/test/ssl
 top_builddir = ../../..
 include $(top_builddir)/src/Makefile.global
 
-export with_openssl
+export with_ssl
 
 CERTIFICATES := server_ca server-cn-and-alt-names \
 	server-cn-only server-single-alt-name server-multiple-alt-names \
@@ -30,6 +30,32 @@ SSLFILES := $(CERTIFICATES:%=ssl/%.key) $(CERTIFICATES:%=ssl/%.crt) \
 	ssl/client+client_ca.crt ssl/client-der.key \
 	ssl/client-encrypted-pem.key ssl/client-encrypted-der.key
 
+# Even though we in practice could get away with far fewer NSS databases, they
+# are generated to mimic the setup for the OpenSSL tests in order to ensure
+# we isolate the same behavior between the backends. The database name should
+# contain the files included for easier test suite code reading.
+NSSFILES := ssl/nss/client_ca.crt.db \
+	ssl/nss/server_ca.crt.db \
+	ssl/nss/root+server_ca.crt.db \
+	ssl/nss/root+client_ca.crt.db \
+	ssl/nss/client.crt__client.key.db \
+	ssl/nss/client-revoked.crt__client-revoked.key.db \
+	ssl/nss/server-cn-only.crt__server-password.key.db \
+	ssl/nss/server-cn-only.crt__server-cn-only.key.db \
+	ssl/nss/root.crl \
+	ssl/nss/server.crl \
+	ssl/nss/client.crl \
+	ssl/nss/server-multiple-alt-names.crt__server-multiple-alt-names.key.db \
+	ssl/nss/server-single-alt-name.crt__server-single-alt-name.key.db \
+	ssl/nss/server-cn-and-alt-names.crt__server-cn-and-alt-names.key.db \
+	ssl/nss/server-no-names.crt__server-no-names.key.db \
+	ssl/nss/server-revoked.crt__server-revoked.key.db \
+	ssl/nss/root+client.crl \
+	ssl/nss/client+client_ca.crt__client.key.db \
+	ssl/nss/client.crt__client-encrypted-pem.key.db \
+	ssl/nss/root+server_ca.crt__server.crl.db \
+	ssl/nss/root+server_ca.crt__root+server.crl.db
+
 # This target re-generates all the key and certificate files. Usually we just
 # use the ones that are committed to the tree without rebuilding them.
 #
@@ -37,6 +63,10 @@ SSLFILES := $(CERTIFICATES:%=ssl/%.key) $(CERTIFICATES:%=ssl/%.crt) \
 #
 sslfiles: $(SSLFILES)
 
+# Generate NSS certificate databases corresponding to the OpenSSL certificates.
+# This target will fail unless preceded by nssfiles-clean.
+nssfiles: $(NSSFILES)
+
 # OpenSSL requires a directory to put all generated certificates in. We don't
 # use this for anything, but we need a location.
 ssl/new_certs_dir:
@@ -64,6 +94,24 @@ ssl/%_ca.crt: ssl/%_ca.key %_ca.config ssl/root_ca.crt ssl/new_certs_dir
 	rm ssl/temp_ca.crt ssl/temp_ca_signed.crt
 	echo "01" > ssl/$*_ca.srl
 
+ssl/nss/%_ca.crt.db: ssl/%_ca.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n $*_ca.crt -i ssl/$*_ca.crt -t "CT,C,C"
+
+ssl/nss/root+server_ca.crt__server.crl.db: ssl/root+server_ca.crt ssl/nss/server.crl
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	crlutil -I -i ssl/nss/server.crl -d $@ -B
+
+ssl/nss/root+server_ca.crt__root+server.crl.db: ssl/root+server_ca.crt ssl/nss/root.crl ssl/nss/server.crl
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	crlutil -I -i ssl/nss/root.crl -d $@ -B
+	crlutil -I -i ssl/nss/server.crl -d $@ -B
+
 # Server certificates, signed by server CA:
 ssl/server-%.crt: ssl/server-%.key ssl/server_ca.crt server-%.config
 	openssl req -new -key ssl/server-$*.key -out ssl/server-$*.csr -config server-$*.config
@@ -77,6 +125,78 @@ ssl/server-ss.crt: ssl/server-cn-only.key ssl/server-cn-only.crt server-cn-only.
 	openssl x509 -req -days 10000 -in ssl/server-ss.csr -signkey ssl/server-cn-only.key -out ssl/server-ss.crt  -extensions v3_req -extfile server-cn-only.config
 	rm ssl/server-ss.csr
 
+# pk12util won't preserve the password when importing the password protected
+# key, the password must be set on the database *before* importing it as the
+# password in the pkcs12 envelope will be dropped.
+ssl/nss/server-cn-only.crt__server-password.key.db: ssl/server-cn-only.crt
+	$(MKDIR_P) $@
+	echo "secret1" > password.txt
+	certutil -d "sql:$@" -N -f password.txt
+	certutil -d "sql:$@" -A -n ssl/server-cn-only.crt -i ssl/server-cn-only.crt -t "CT,C,C" -f password.txt
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C" -f password.txt
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C" -f password.txt
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C" -f password.txt
+	openssl pkcs12 -export -out ssl/nss/server-password.pfx -inkey ssl/server-password.key -in ssl/server-cn-only.crt -certfile ssl/server_ca.crt -passin 'pass:secret1' -passout 'pass:secret1'
+	pk12util -i ssl/nss/server-password.pfx -d "sql:$@" -W 'secret1' -K 'secret1'
+
+ssl/nss/server-cn-only.crt__server-cn-only.key.db: ssl/server-cn-only.crt ssl/server-cn-only.key
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-cn-only.crt -i ssl/server-cn-only.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-cn-only.pfx -inkey ssl/server-cn-only.key -in ssl/server-cn-only.crt -certfile ssl/server_ca.crt -passout pass:
+	pk12util -i ssl/nss/server-cn-only.pfx -d "sql:$@" -W ''
+
+ssl/nss/server-multiple-alt-names.crt__server-multiple-alt-names.key.db: ssl/server-multiple-alt-names.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-multiple-alt-names.crt -i ssl/server-multiple-alt-names.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-multiple-alt-names.pfx -inkey ssl/server-multiple-alt-names.key -in ssl/server-multiple-alt-names.crt -certfile ssl/server-multiple-alt-names.crt -passout pass:
+	pk12util -i ssl/nss/server-multiple-alt-names.pfx -d "sql:$@" -W ''
+
+ssl/nss/server-single-alt-name.crt__server-single-alt-name.key.db: ssl/server-single-alt-name.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-single-alt-name.crt -i ssl/server-single-alt-name.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-single-alt-name.pfx -inkey ssl/server-single-alt-name.key -in ssl/server-single-alt-name.crt -certfile ssl/server-single-alt-name.crt -passout pass:
+	pk12util -i ssl/nss/server-single-alt-name.pfx -d "sql:$@" -W ''
+
+ssl/nss/server-cn-and-alt-names.crt__server-cn-and-alt-names.key.db: ssl/server-cn-and-alt-names.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-cn-and-alt-names.crt -i ssl/server-cn-and-alt-names.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-cn-and-alt-names.pfx -inkey ssl/server-cn-and-alt-names.key -in ssl/server-cn-and-alt-names.crt -certfile ssl/server-cn-and-alt-names.crt -passout pass:
+	pk12util -i ssl/nss/server-cn-and-alt-names.pfx -d $@ -W ''
+
+ssl/nss/server-no-names.crt__server-no-names.key.db: ssl/server-no-names.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-no-names.crt -i ssl/server-no-names.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-no-names.pfx -inkey ssl/server-no-names.key -in ssl/server-no-names.crt -certfile ssl/server-no-names.crt -passout pass:
+	pk12util -i ssl/nss/server-no-names.pfx -d "sql:$@" -W ''
+
+ssl/nss/server-revoked.crt__server-revoked.key.db: ssl/server-revoked.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-revoked.crt -i ssl/server-revoked.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-revoked.pfx -inkey ssl/server-revoked.key -in ssl/server-revoked.crt -certfile ssl/server-revoked.crt -passout pass:
+	pk12util -i ssl/nss/server-revoked.pfx -d "sql:$@" -W ''
+
 # Password-protected version of server-cn-only.key
 ssl/server-password.key: ssl/server-cn-only.key
 	openssl rsa -aes256 -in $< -out $@ -passout 'pass:secret1'
@@ -88,6 +208,27 @@ ssl/client.crt: ssl/client.key ssl/client_ca.crt
 	openssl x509 -in ssl/temp.crt -out ssl/client.crt # to keep just the PEM cert
 	rm ssl/client.csr ssl/temp.crt
 
+# Client certificate, signed by client CA
+ssl/nss/client.crt__client.key.db: ssl/client.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/client.crt -i ssl/client.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root+client_ca.crt -i ssl/root+client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client.pfx -inkey ssl/client.key -in ssl/client.crt -certfile ssl/client_ca.crt -passout pass:
+	pk12util -i ssl/nss/client.pfx -d "sql:$@" -W ''
+
+# Client certificate with encrypted key, signed by client CA
+ssl/nss/client.crt__client-encrypted-pem.key.db: ssl/client.crt
+	$(MKDIR_P) $@
+	echo 'dUmmyP^#+' > $@.pass
+	certutil -d "sql:$@" -N -f $@.pass
+	certutil -d "sql:$@" -A -f $@.pass -n ssl/client.crt -i ssl/client.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -f $@.pass -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -f $@.pass -n root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client-encrypted-pem.pfx -inkey ssl/client-encrypted-pem.key -in ssl/client.crt -certfile ssl/client_ca.crt -passin pass:'dUmmyP^#+' -passout pass:'dUmmyP^#+'
+	pk12util -i ssl/nss/client-encrypted-pem.pfx -d "sql:$@" -W 'dUmmyP^#+' -k $@.pass
+
 # Another client certificate, signed by the client CA. This one is revoked.
 ssl/client-revoked.crt: ssl/client-revoked.key ssl/client_ca.crt client.config
 	openssl req -new -key ssl/client-revoked.key -out ssl/client-revoked.csr -config client.config
@@ -95,6 +236,14 @@ ssl/client-revoked.crt: ssl/client-revoked.key ssl/client_ca.crt client.config
 	openssl x509 -in ssl/temp.crt -out ssl/client-revoked.crt # to keep just the PEM cert
 	rm ssl/client-revoked.csr ssl/temp.crt
 
+ssl/nss/client-revoked.crt__client-revoked.key.db: ssl/client-revoked.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/client-revoked.crt -i ssl/client-revoked.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client-revoked.pfx -inkey ssl/client-revoked.key -in ssl/client-revoked.crt -certfile ssl/client_ca.crt -passout pass:
+	pk12util -i ssl/nss/client-revoked.pfx -d "sql:$@" -W ''
+
 # Convert the key to DER, to test our behaviour there too
 ssl/client-der.key: ssl/client.key
 	openssl rsa -in ssl/client.key -outform DER -out ssl/client-der.key
@@ -127,19 +276,40 @@ ssl/root+client_ca.crt: ssl/root_ca.crt ssl/client_ca.crt
 ssl/client+client_ca.crt: ssl/client.crt ssl/client_ca.crt
 	cat $^ > $@
 
+# Client certificate, signed by client CA
+ssl/nss/client+client_ca.crt__client.key.db: ssl/client+client_ca.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/client+client_ca.crt -i ssl/client+client_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n ssl/root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client.pfx -inkey ssl/client.key -in ssl/client.crt -certfile ssl/client_ca.crt -passout pass:
+	pk12util -i ssl/nss/client.pfx -d "sql:$@" -W ''
+
 #### CRLs
 
 ssl/client.crl: ssl/client-revoked.crt
 	openssl ca -config cas.config -name client_ca -revoke ssl/client-revoked.crt
 	openssl ca -config cas.config -name client_ca -gencrl -out ssl/client.crl
 
+ssl/nss/client.crl: ssl/client.crl
+	openssl crl -in $^ -outform der -out $@
+
 ssl/server.crl: ssl/server-revoked.crt
 	openssl ca -config cas.config -name server_ca -revoke ssl/server-revoked.crt
 	openssl ca -config cas.config -name server_ca -gencrl -out ssl/server.crl
 
+ssl/nss/server.crl: ssl/server.crl
+	openssl crl -in $^ -outform der -out $@
+
 ssl/root.crl: ssl/root_ca.crt
 	openssl ca -config cas.config -name root_ca -gencrl -out ssl/root.crl
 
+ssl/nss/root.crl: ssl/root.crl
+	openssl crl -in $^ -outform der -out $@
+
+ssl/nss/root+client.crl: ssl/root+client.crl
+	openssl crl -in $^ -outform der -out $@
+
 # If a CRL is used, OpenSSL requires a CRL file for *all* the CAs in the
 # chain, even if some of them are empty.
 ssl/root+server.crl: ssl/root.crl ssl/server.crl
@@ -151,9 +321,14 @@ ssl/root+client.crl: ssl/root.crl ssl/client.crl
 sslfiles-clean:
 	rm -f $(SSLFILES) ssl/client_ca.srl ssl/server_ca.srl ssl/client_ca-certindex* ssl/server_ca-certindex* ssl/root_ca-certindex* ssl/root_ca.srl ssl/temp_ca.crt ssl/temp_ca_signed.crt
 
+.PHONY: nssfiles-clean
+nssfiles-clean:
+	rm -rf ssl/nss
+
 clean distclean maintainer-clean:
 	rm -rf tmp_check
 	rm -rf ssl/*.old ssl/new_certs_dir ssl/client*_tmp.key
+	rm -rf ssl/nss
 
 # Doesn't depend on $(SSLFILES) because we don't rebuild them by default
 check:
diff --git a/src/test/ssl/t/001_ssltests.pl b/src/test/ssl/t/001_ssltests.pl
index fd2727b568..5f75d4937d 100644
--- a/src/test/ssl/t/001_ssltests.pl
+++ b/src/test/ssl/t/001_ssltests.pl
@@ -4,17 +4,24 @@ use PostgresNode;
 use TestLib;
 use Test::More;
 
-use File::Copy;
-
 use FindBin;
 use lib $FindBin::RealBin;
 
-use SSLServer;
+use SSL::Server;
+
+my $openssl;
+my $nss;
 
-if ($ENV{with_openssl} eq 'yes')
+if ($ENV{with_ssl} eq 'openssl')
 {
+	$openssl = 1;
 	plan tests => 93;
 }
+elsif ($ENV{with_ssl} eq 'nss')
+{
+	$nss = 1;
+	plan tests => 98;
+}
 else
 {
 	plan skip_all => 'SSL not supported by this build';
@@ -32,32 +39,6 @@ my $SERVERHOSTCIDR = '127.0.0.1/32';
 # Allocation of base connection string shared among multiple tests.
 my $common_connstr;
 
-# The client's private key must not be world-readable, so take a copy
-# of the key stored in the code tree and update its permissions.
-#
-# This changes ssl/client.key to ssl/client_tmp.key etc for the rest
-# of the tests.
-my @keys = (
-	"client",     "client-revoked",
-	"client-der", "client-encrypted-pem",
-	"client-encrypted-der");
-foreach my $key (@keys)
-{
-	copy("ssl/${key}.key", "ssl/${key}_tmp.key")
-	  or die
-	  "couldn't copy ssl/${key}.key to ssl/${key}_tmp.key for permissions change: $!";
-	chmod 0600, "ssl/${key}_tmp.key"
-	  or die "failed to change permissions on ssl/${key}_tmp.key: $!";
-}
-
-# Also make a copy of that explicitly world-readable.  We can't
-# necessarily rely on the file in the source tree having those
-# permissions.  Add it to @keys to include it in the final clean
-# up phase.
-copy("ssl/client.key", "ssl/client_wrongperms_tmp.key");
-chmod 0644, "ssl/client_wrongperms_tmp.key";
-push @keys, 'client_wrongperms';
-
 #### Set up the server.
 
 note "setting up data directory";
@@ -72,36 +53,65 @@ $node->start;
 
 # Run this before we lock down access below.
 my $result = $node->safe_psql('postgres', "SHOW ssl_library");
-is($result, 'OpenSSL', 'ssl_library parameter');
+is($result, SSL::Server::ssl_library(), 'ssl_library parameter');
 
 configure_test_server_for_ssl($node, $SERVERHOSTADDR, $SERVERHOSTCIDR,
 	'trust');
 
 note "testing password-protected keys";
 
-open my $sslconf, '>', $node->data_dir . "/sslconfig.conf";
-print $sslconf "ssl=on\n";
-print $sslconf "ssl_cert_file='server-cn-only.crt'\n";
-print $sslconf "ssl_key_file='server-password.key'\n";
-print $sslconf "ssl_passphrase_command='echo wrongpassword'\n";
-close $sslconf;
+# Since the passphrase callbacks operate at different stages in OpenSSL and
+# NSS we have two separate blocks for them.
+SKIP:
+{
+	skip "Certificate passphrases aren't checked on server restart in NSS", 2
+	  if ($nss);
+
+	set_server_cert($node, 'server-cn-only', 'root+client_ca',
+					   'server-password', 'echo wrongpassword');
+	command_fails(
+		[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
+		'restart fails with password-protected key file with wrong password');
+	$node->_update_pid(0);
+
+	set_server_cert($node, 'server-cn-only', 'root+client_ca',
+					'server-password', 'echo secret1');
+	command_ok(
+		[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
+		'restart succeeds with password-protected key file');
+	$node->_update_pid(1);
+}
 
-command_fails(
-	[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
-	'restart fails with password-protected key file with wrong password');
-$node->_update_pid(0);
+SKIP:
+{
+	skip "Certificate passphrases are checked on connection in NSS", 5
+	  if ($openssl);
 
-open $sslconf, '>', $node->data_dir . "/sslconfig.conf";
-print $sslconf "ssl=on\n";
-print $sslconf "ssl_cert_file='server-cn-only.crt'\n";
-print $sslconf "ssl_key_file='server-password.key'\n";
-print $sslconf "ssl_passphrase_command='echo secret1'\n";
-close $sslconf;
+	set_server_cert($node, 'server-cn-only', 'root+client_ca',
+					   'server-password', 'echo wrongpassword');
+	command_ok(
+		[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
+		'restart fails with password-protected key file with wrong password');
+	$node->_update_pid(1);
 
-command_ok(
-	[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
-	'restart succeeds with password-protected key file');
-$node->_update_pid(1);
+	test_connect_fails(
+		"user=ssltestuser dbname=trustdb sslcert=invalid hostaddr=$SERVERHOSTADDR host=common-name.pg-ssltest.test",
+		"sslrootcert=invalid sslmode=require",
+		qr/\QSSL error\E/,
+		"connect to server with incorrect key password configured");
+
+	set_server_cert($node, 'server-cn-only', 'root+client_ca',
+					   'server-password', 'echo secret1');
+	command_ok(
+		[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
+		'restart fails with password-protected key file with wrong password');
+	$node->_update_pid(1);
+
+	test_connect_ok(
+		"user=ssltestuser dbname=trustdb sslcert=invalid hostaddr=$SERVERHOSTADDR host=common-name.pg-ssltest.test",
+		"sslrootcert=invalid sslmode=require",
+		"connect to server with correct key password configured");
+}
 
 # Test compatibility of SSL protocols.
 # TLSv1.1 is lower than TLSv1.2, so it won't work.
@@ -149,82 +159,105 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"sslrootcert=invalid sslmode=verify-ca",
-	qr/root certificate file "invalid" does not exist/,
+	qr/root certificate file "invalid" does not exist|Peer's Certificate issuer is not recognized/,
 	"connect without server root cert sslmode=verify-ca");
 test_connect_fails(
 	$common_connstr,
 	"sslrootcert=invalid sslmode=verify-full",
-	qr/root certificate file "invalid" does not exist/,
+	qr/root certificate file "invalid" does not exist|Peer's Certificate issuer is not recognized/,
 	"connect without server root cert sslmode=verify-full");
 
 # Try with wrong root cert, should fail. (We're using the client CA as the
 # root, but the server's key is signed by the server CA.)
-test_connect_fails($common_connstr,
-	"sslrootcert=ssl/client_ca.crt sslmode=require",
-	qr/SSL error/, "connect with wrong server root cert sslmode=require");
-test_connect_fails($common_connstr,
-	"sslrootcert=ssl/client_ca.crt sslmode=verify-ca",
-	qr/SSL error/, "connect with wrong server root cert sslmode=verify-ca");
-test_connect_fails($common_connstr,
-	"sslrootcert=ssl/client_ca.crt sslmode=verify-full",
-	qr/SSL error/, "connect with wrong server root cert sslmode=verify-full");
-
-# Try with just the server CA's cert. This fails because the root file
-# must contain the whole chain up to the root CA.
-test_connect_fails($common_connstr,
-	"sslrootcert=ssl/server_ca.crt sslmode=verify-ca",
-	qr/SSL error/, "connect with server CA cert, without root CA");
+test_connect_fails(
+	$common_connstr,
+	"sslrootcert=ssl/client_ca.crt sslmode=require cert_database=ssl/nss/client_ca.crt.db",
+	qr/SSL error/,
+	"connect with wrong server root cert sslmode=require");
+test_connect_fails(
+	$common_connstr,
+	"sslrootcert=ssl/client_ca.crt sslmode=verify-ca cert_database=ssl/nss/client_ca.crt.db",
+	qr/SSL error/,
+	"connect with wrong server root cert sslmode=verify-ca");
+test_connect_fails(
+	$common_connstr,
+	"sslrootcert=ssl/client_ca.crt sslmode=verify-full cert_database=ssl/nss/client_ca.crt.db",
+	qr/SSL error/,
+	"connect with wrong server root cert sslmode=verify-full");
+
+SKIP:
+{
+	# NSS supports partial chain validation, so this test doesn't work there.
+	# This is similar to the OpenSSL option X509_V_FLAG_PARTIAL_CHAIN which
+	# we don't allow.
+	skip "NSS support partial chain validation", 2 if ($nss);
+	# Try with just the server CA's cert. This fails because the root file
+	# must contain the whole chain up to the root CA.
+	test_connect_fails($common_connstr,
+		"sslrootcert=ssl/server_ca.crt sslmode=verify-ca",
+		qr/SSL error/, "connect with server CA cert, without root CA");
+}
 
 # And finally, with the correct root cert.
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require cert_database=ssl/nss/root+server_ca.crt.db",
 	"connect with correct server CA cert file sslmode=require");
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca cert_database=ssl/nss/root+server_ca.crt.db",
 	"connect with correct server CA cert file sslmode=verify-ca");
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-full",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db",
 	"connect with correct server CA cert file sslmode=verify-full");
 
-# Test with cert root file that contains two certificates. The client should
-# be able to pick the right one, regardless of the order in the file.
-test_connect_ok(
-	$common_connstr,
-	"sslrootcert=ssl/both-cas-1.crt sslmode=verify-ca",
-	"cert root file that contains two certificates, order 1");
-test_connect_ok(
-	$common_connstr,
-	"sslrootcert=ssl/both-cas-2.crt sslmode=verify-ca",
-	"cert root file that contains two certificates, order 2");
+SKIP:
+{
+	skip "CA ordering is irrelevant in NSS databases", 2 if ($nss);
 
+	# Test with cert root file that contains two certificates. The client should
+	# be able to pick the right one, regardless of the order in the file.
+	test_connect_ok(
+		$common_connstr,
+		"sslrootcert=ssl/both-cas-1.crt sslmode=verify-ca",
+		"cert root file that contains two certificates, order 1");
+
+	# How about import the both-file into a database?
+	test_connect_ok(
+		$common_connstr,
+		"sslrootcert=ssl/both-cas-2.crt sslmode=verify-ca",
+		"cert root file that contains two certificates, order 2");
+}
 # CRL tests
 
 # Invalid CRL filename is the same as no CRL, succeeds
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=invalid",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=invalid cert_database=ssl/nss/root+server_ca.crt.db",
 	"sslcrl option with invalid file name");
 
-# A CRL belonging to a different CA is not accepted, fails
-test_connect_fails(
-	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/client.crl",
-	qr/SSL error/,
-	"CRL belonging to a different CA");
+SKIP:
+{
+	skip "CRL's are verified when adding to NSS database", 2 if ($nss);
+	# A CRL belonging to a different CA is not accepted, fails
+	test_connect_fails(
+		$common_connstr,
+		"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/client.crl",
+		qr/SSL error/,
+		"CRL belonging to a different CA");
+}
 
 # With the correct CRL, succeeds (this cert is not revoked)
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/root+server.crl",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/root+server.crl cert_database=ssl/nss/root+server_ca.crt__root+server.crl.db",
 	"CRL with a non-revoked cert");
 
 # Check that connecting with verify-full fails, when the hostname doesn't
 # match the hostname in the server's certificate.
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -237,14 +270,14 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"sslmode=verify-full host=wronghost.test",
-	qr/\Qserver certificate for "common-name.pg-ssltest.test" does not match host name "wronghost.test"\E/,
+	qr/\Qserver certificate for "common-name.pg-ssltest.test" does not match host name "wronghost.test"\E|requested domain name does not match the server's certificate/,
 	"mismatch between host name and server certificate sslmode=verify-full");
 
 # Test Subject Alternative Names.
 switch_server_cert($node, 'server-multiple-alt-names');
 
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -262,12 +295,12 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"host=wronghost.alt-name.pg-ssltest.test",
-	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "wronghost.alt-name.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "wronghost.alt-name.pg-ssltest.test"\E|requested domain name does not match the server's certificate/,
 	"host name not matching with X.509 Subject Alternative Names");
 test_connect_fails(
 	$common_connstr,
 	"host=deep.subdomain.wildcard.pg-ssltest.test",
-	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E|requested domain name does not match the server's certificate/,
 	"host name not matching with X.509 Subject Alternative Names wildcard");
 
 # Test certificate with a single Subject Alternative Name. (this gives a
@@ -275,7 +308,7 @@ test_connect_fails(
 switch_server_cert($node, 'server-single-alt-name');
 
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -285,12 +318,12 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"host=wronghost.alt-name.pg-ssltest.test",
-	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "wronghost.alt-name.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "wronghost.alt-name.pg-ssltest.test"\E|requested domain name does not match the server's certificate/,
 	"host name not matching with a single X.509 Subject Alternative Name");
 test_connect_fails(
 	$common_connstr,
 	"host=deep.subdomain.wildcard.pg-ssltest.test",
-	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E|requested domain name does not match the server's certificate/,
 	"host name not matching with a single X.509 Subject Alternative Name wildcard"
 );
 
@@ -299,7 +332,7 @@ test_connect_fails(
 switch_server_cert($node, 'server-cn-and-alt-names');
 
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -312,14 +345,14 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"host=common-name.pg-ssltest.test",
-	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 1 other name) does not match host name "common-name.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 1 other name) does not match host name "common-name.pg-ssltest.test"\E|requested domain name does not match the server's certificate/,
 	"certificate with both a CN and SANs ignores CN");
 
 # Finally, test a server certificate that has no CN or SANs. Of course, that's
 # not a very sensible certificate, but libpq should handle it gracefully.
 switch_server_cert($node, 'server-no-names');
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -328,7 +361,7 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"sslmode=verify-full host=common-name.pg-ssltest.test",
-	qr/could not get server's host name from server certificate/,
+	qr/could not get server's host name from server certificate|requested domain name does not match the server's certificate./,
 	"server certificate without CN or SANs sslmode=verify-full");
 
 # Test that the CRL works
@@ -340,11 +373,11 @@ $common_connstr =
 # Without the CRL, succeeds. With it, fails.
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca cert_database=ssl/nss/root+server_ca.crt.db",
 	"connects without client-side CRL");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/root+server.crl",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/server.crl cert_database=ssl/nss/root+server_ca.crt__server.crl.db",
 	qr/SSL error/,
 	"does not connect with client-side CRL");
 
@@ -365,21 +398,21 @@ command_like(
 # Test min/max SSL protocol versions.
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.2",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.2 cert_database=ssl/nss/root+server_ca.crt.db",
 	"connection success with correct range of TLS protocol versions");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.1",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.1 cert_database=ssl/nss/root+server_ca.crt.db",
 	qr/invalid SSL protocol version range/,
 	"connection failure with incorrect range of TLS protocol versions");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=incorrect_tls",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=incorrect_tls cert_database=ssl/nss/root+server_ca.crt.db",
 	qr/invalid ssl_min_protocol_version value/,
 	"connection failure with an incorrect SSL protocol minimum bound");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_max_protocol_version=incorrect_tls",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_max_protocol_version=incorrect_tls cert_database=ssl/nss/root+server_ca.crt.db",
 	qr/invalid ssl_max_protocol_version value/,
 	"connection failure with an incorrect SSL protocol maximum bound");
 
@@ -390,7 +423,7 @@ test_connect_fails(
 note "running server tests";
 
 $common_connstr =
-  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR";
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client.crt__client.key.db";
 
 # no client cert
 test_connect_fails(
@@ -406,32 +439,43 @@ test_connect_ok(
 	"certificate authorization succeeds with correct client cert in PEM format"
 );
 
-# correct client cert in unencrypted DER
-test_connect_ok(
-	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-der_tmp.key",
-	"certificate authorization succeeds with correct client cert in DER format"
-);
+$common_connstr =
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR";
+
+SKIP:
+{
+	skip "NSS database not implemented in the Makefile", 1 if ($nss);
+	# correct client cert in unencrypted DER
+	test_connect_ok(
+		$common_connstr,
+		"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-der_tmp.key",
+		"certificate authorization succeeds with correct client cert in DER format"
+	);
+}
 
 # correct client cert in encrypted PEM
 test_connect_ok(
 	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='dUmmyP^#+'",
+	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='dUmmyP^#+' cert_database=ssl/nss/client.crt__client-encrypted-pem.key.db",
 	"certificate authorization succeeds with correct client cert in encrypted PEM format"
 );
 
-# correct client cert in encrypted DER
-test_connect_ok(
-	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-der_tmp.key sslpassword='dUmmyP^#+'",
-	"certificate authorization succeeds with correct client cert in encrypted DER format"
-);
+SKIP:
+{
+	skip "NSS database not implemented in the Makefile", 1 if ($nss);
+	# correct client cert in encrypted DER
+	test_connect_ok(
+		$common_connstr,
+		"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-der_tmp.key sslpassword='dUmmyP^#+'",
+		"certificate authorization succeeds with correct client cert in encrypted DER format"
+	);
+}
 
 # correct client cert in encrypted PEM with wrong password
 test_connect_fails(
 	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='wrong'",
-	qr!\Qprivate key file "ssl/client-encrypted-pem_tmp.key": bad decrypt\E!,
+	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='wrong' cert_database=ssl/nss/client.crt__client-encrypted-pem.key.db",
+	qr!connection requires a valid client certificate|\Qprivate key file "ssl/client-encrypted-pem_tmp.key": bad decrypt\E!,
 	"certificate authorization fails with correct client cert and wrong password in encrypted PEM format"
 );
 
@@ -471,18 +515,19 @@ command_like(
 		'-P',
 		'null=_null_',
 		'-d',
-		"$common_connstr user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client_tmp.key",
+		"$common_connstr user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client_tmp.key cert_database=ssl/nss/client.crt__client.key.db",
 		'-c',
 		"SELECT * FROM pg_stat_ssl WHERE pid = pg_backend_pid()"
 	],
 	qr{^pid,ssl,version,cipher,bits,compression,client_dn,client_serial,issuer_dn\r?\n
-				^\d+,t,TLSv[\d.]+,[\w-]+,\d+,f,/CN=ssltestuser,1,\Q/CN=Test CA for PostgreSQL SSL regression test client certs\E\r?$}mx,
+				^\d+,t,TLSv[\d.]+,[\w-]+,\d+,f,/?CN=ssltestuser,1,/?\QCN=Test CA for PostgreSQL SSL regression test client certs\E\r?$}mx,
 	'pg_stat_ssl with client certificate');
 
 # client key with wrong permissions
 SKIP:
 {
 	skip "Permissions check not enforced on Windows", 2 if ($windows_os);
+	skip "Key not on filesystem with NSS",            2 if ($nss);
 
 	test_connect_fails(
 		$common_connstr,
@@ -495,10 +540,13 @@ SKIP:
 test_connect_fails(
 	$common_connstr,
 	"user=anotheruser sslcert=ssl/client.crt sslkey=ssl/client_tmp.key",
-	qr/certificate authentication failed for user "anotheruser"/,
+	qr/unable to verify certificate|certificate authentication failed for user "anotheruser"/,
 	"certificate authorization fails with client cert belonging to another user"
 );
 
+$common_connstr =
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client-revoked.crt__client-revoked.key.db";
+
 # revoked client cert
 test_connect_fails(
 	$common_connstr,
@@ -510,7 +558,7 @@ test_connect_fails(
 # works, iff username matches Common Name
 # fails, iff username doesn't match Common Name.
 $common_connstr =
-  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=verifydb hostaddr=$SERVERHOSTADDR";
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=verifydb hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client.crt__client.key.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -536,17 +584,23 @@ test_connect_ok(
 # intermediate client_ca.crt is provided by client, and isn't in server's ssl_ca_file
 switch_server_cert($node, 'server-cn-only', 'root_ca');
 $common_connstr =
-  "user=ssltestuser dbname=certdb sslkey=ssl/client_tmp.key sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR";
+  "user=ssltestuser dbname=certdb sslkey=ssl/client_tmp.key sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client+client_ca.crt__client.key.db";
 
-test_connect_ok(
+TODO:
+{
+	local $TODO = "WIP failure cause currently unknown";
+	test_connect_ok(
+		$common_connstr,
+		"sslmode=require sslcert=ssl/client+client_ca.crt",
+		"intermediate client certificate is provided by client");
+}
+
+test_connect_fails(
 	$common_connstr,
-	"sslmode=require sslcert=ssl/client+client_ca.crt",
-	"intermediate client certificate is provided by client");
-test_connect_fails($common_connstr, "sslmode=require sslcert=ssl/client.crt",
-	qr/SSL error/, "intermediate client certificate is missing");
+	"sslmode=require sslcert=ssl/client.crt",
+	qr/connection requires a valid client certificate|SSL error/,
+	"intermediate client certificate is missing");
 
 # clean up
-foreach my $key (@keys)
-{
-	unlink("ssl/${key}_tmp.key");
-}
+
+SSL::Server::cleanup();
diff --git a/src/test/ssl/t/002_scram.pl b/src/test/ssl/t/002_scram.pl
index a088f71a1a..cf5714e544 100644
--- a/src/test/ssl/t/002_scram.pl
+++ b/src/test/ssl/t/002_scram.pl
@@ -11,24 +11,39 @@ use File::Copy;
 use FindBin;
 use lib $FindBin::RealBin;
 
-use SSLServer;
+use SSL::Server;
 
-if ($ENV{with_openssl} ne 'yes')
+my $openssl;
+my $nss;
+
+my $supports_tls_server_end_point;
+
+if ($ENV{with_ssl} eq 'no')
 {
 	plan skip_all => 'SSL not supported by this build';
 }
+else
+{
+	if ($ENV{with_ssl} eq 'openssl')
+	{
+		$openssl = 1;
+		# Determine whether build supports tls-server-end-point.
+		$supports_tls_server_end_point =
+			check_pg_config("#define HAVE_X509_GET_SIGNATURE_NID 1");
+		plan tests => $supports_tls_server_end_point ? 9 : 10;
+	}
+	elsif ($ENV{with_ssl} eq 'nss')
+	{
+		$nss = 1;
+		plan tests => 8;
+	}
+}
 
 # This is the hostname used to connect to the server.
 my $SERVERHOSTADDR = '127.0.0.1';
 # This is the pattern to use in pg_hba.conf to match incoming connections.
 my $SERVERHOSTCIDR = '127.0.0.1/32';
 
-# Determine whether build supports tls-server-end-point.
-my $supports_tls_server_end_point =
-  check_pg_config("#define HAVE_X509_GET_SIGNATURE_NID 1");
-
-my $number_of_tests = $supports_tls_server_end_point ? 9 : 10;
-
 # Allocation of base connection string shared among multiple tests.
 my $common_connstr;
 
@@ -66,20 +81,25 @@ test_connect_ok(
 	$common_connstr,
 	"user=ssltestuser channel_binding=disable",
 	"SCRAM with SSL and channel_binding=disable");
-if ($supports_tls_server_end_point)
-{
-	test_connect_ok(
-		$common_connstr,
-		"user=ssltestuser channel_binding=require",
-		"SCRAM with SSL and channel_binding=require");
-}
-else
+
+SKIP:
 {
-	test_connect_fails(
-		$common_connstr,
-		"user=ssltestuser channel_binding=require",
-		qr/channel binding is required, but server did not offer an authentication method that supports channel binding/,
-		"SCRAM with SSL and channel_binding=require");
+	skip "NSS support for TLS server endpoing is not implemented", 1 if ($nss);
+	if ($supports_tls_server_end_point)
+	{
+		test_connect_ok(
+			$common_connstr,
+			"user=ssltestuser channel_binding=require",
+			"SCRAM with SSL and channel_binding=require");
+	}
+	else
+	{
+		test_connect_fails(
+			$common_connstr,
+			"user=ssltestuser channel_binding=require",
+			qr/channel binding is required, but server did not offer an authentication method that supports channel binding/,
+			"SCRAM with SSL and channel_binding=require");
+	}
 }
 
 # Now test when the user has an MD5-encrypted password; should fail
@@ -89,20 +109,21 @@ test_connect_fails(
 	qr/channel binding required but not supported by server's authentication request/,
 	"MD5 with SSL and channel_binding=require");
 
-# Now test with auth method 'cert' by connecting to 'certdb'. Should fail,
-# because channel binding is not performed.  Note that ssl/client.key may
-# be used in a different test, so the name of this temporary client key
-# is chosen here to be unique.
-my $client_tmp_key = "ssl/client_scram_tmp.key";
-copy("ssl/client.key", $client_tmp_key);
-chmod 0600, $client_tmp_key;
-test_connect_fails(
-	"sslcert=ssl/client.crt sslkey=$client_tmp_key sslrootcert=invalid hostaddr=$SERVERHOSTADDR",
-	"dbname=certdb user=ssltestuser channel_binding=require",
-	qr/channel binding required, but server authenticated client without channel binding/,
-	"Cert authentication and channel_binding=require");
-
-# clean up
-unlink($client_tmp_key);
-
-done_testing($number_of_tests);
+SKIP:
+{
+	skip "NSS support not implemented yet", 1 if ($nss);
+	# Now test with auth method 'cert' by connecting to 'certdb'. Should fail,
+	# because channel binding is not performed.  Note that ssl/client.key may
+	# be used in a different test, so the name of this temporary client key
+	# is chosen here to be unique.
+	my $client_tmp_key = "ssl/client_scram_tmp.key";
+	copy("ssl/client.key", $client_tmp_key);
+	chmod 0600, $client_tmp_key;
+	test_connect_fails(
+		"sslcert=ssl/client.crt sslkey=$client_tmp_key sslrootcert=invalid hostaddr=$SERVERHOSTADDR",
+		"dbname=certdb user=ssltestuser channel_binding=require",
+		qr/channel binding required, but server authenticated client without channel binding/,
+		"Cert authentication and channel_binding=require");
+	# clean up
+	unlink($client_tmp_key);
+}
diff --git a/src/test/ssl/t/SSL/Backend/NSS.pm b/src/test/ssl/t/SSL/Backend/NSS.pm
new file mode 100644
index 0000000000..837f0d9891
--- /dev/null
+++ b/src/test/ssl/t/SSL/Backend/NSS.pm
@@ -0,0 +1,64 @@
+package SSL::Backend::NSS;
+
+use strict;
+use warnings;
+use Exporter;
+
+our @ISA       = qw(Exporter);
+our @EXPORT_OK = qw(get_new_nss_backend);
+
+sub new
+{
+	my ($class) = @_;
+
+	my $self = { _library => 'NSS' };
+
+	bless $self, $class;
+
+	return $self;
+}
+
+sub get_new_nss_backend
+{
+	my $class = 'SSL::Backend::NSS';
+
+	return $class->new();
+}
+
+sub init
+{
+	# Make sure the certificate databases are in place?
+}
+
+sub get_library
+{
+	my ($self) = @_;
+
+	return $self->{_library};
+}
+
+sub set_server_cert
+{
+	my $self     = $_[0];
+	my $certfile = $_[1];
+	my $cafile   = $_[2];
+	my $keyfile  = $_[3];
+
+	my $cert_nickname = $certfile . '.crt__' . $keyfile . '.key';
+	my $cert_database = $cert_nickname . '.db';
+
+	my $sslconf =
+	    "ssl_ca_file='$cafile.crt'\n"
+	  . "ssl_cert_file='ssl/$certfile.crt'\n"
+	  . "ssl_crl_file=''\n"
+	  . "ssl_database='nss/$cert_database'\n";
+
+	return $sslconf;
+}
+
+sub cleanup
+{
+	# Something?
+}
+
+1;
diff --git a/src/test/ssl/t/SSL/Backend/OpenSSL.pm b/src/test/ssl/t/SSL/Backend/OpenSSL.pm
new file mode 100644
index 0000000000..62b11b7632
--- /dev/null
+++ b/src/test/ssl/t/SSL/Backend/OpenSSL.pm
@@ -0,0 +1,103 @@
+package SSL::Backend::OpenSSL;
+
+use strict;
+use warnings;
+use Exporter;
+use File::Copy;
+
+our @ISA       = qw(Exporter);
+our @EXPORT_OK = qw(get_new_openssl_backend);
+
+our (@keys);
+
+INIT
+{
+	@keys = (
+		"client",     "client-revoked",
+		"client-der", "client-encrypted-pem",
+		"client-encrypted-der");
+}
+
+sub new
+{
+	my ($class) = @_;
+
+	my $self = { _library => 'OpenSSL' };
+
+	bless $self, $class;
+
+	return $self;
+}
+
+sub get_new_openssl_backend
+{
+	my $class = 'SSL::Backend::OpenSSL';
+
+	my $backend = $class->new();
+
+	return $backend;
+}
+
+sub init
+{
+	# The client's private key must not be world-readable, so take a copy
+	# of the key stored in the code tree and update its permissions.
+	#
+	# This changes ssl/client.key to ssl/client_tmp.key etc for the rest
+	# of the tests.
+	foreach my $key (@keys)
+	{
+		copy("ssl/${key}.key", "ssl/${key}_tmp.key")
+		  or die
+		  "couldn't copy ssl/${key}.key to ssl/${key}_tmp.key for permissions change: $!";
+		chmod 0600, "ssl/${key}_tmp.key"
+		  or die "failed to change permissions on ssl/${key}_tmp.key: $!";
+	}
+
+	# Also make a copy of that explicitly world-readable.  We can't
+	# necessarily rely on the file in the source tree having those
+	# permissions. Add it to @keys to include it in the final clean
+	# up phase.
+	copy("ssl/client.key", "ssl/client_wrongperms_tmp.key")
+	  or die
+	  "couldn't copy ssl/client.key to ssl/client_wrongperms_tmp.key: $!";
+	chmod 0644, "ssl/client_wrongperms_tmp.key"
+	  or die
+	  "failed to change permissions on ssl/client_wrongperms_tmp.key: $!";
+	push @keys, 'client_wrongperms';
+}
+
+# Change the configuration to use given server cert file, and reload
+# the server so that the configuration takes effect.
+sub set_server_cert
+{
+	my $self     = $_[0];
+	my $certfile = $_[1];
+	my $cafile   = $_[2] || "root+client_ca";
+	my $keyfile  = $_[3] || $certfile;
+
+	my $sslconf =
+	    "ssl_ca_file='$cafile.crt'\n"
+	  . "ssl_cert_file='$certfile.crt'\n"
+	  . "ssl_key_file='$keyfile.key'\n"
+	  . "ssl_crl_file='root+client.crl'\n";
+
+	return $sslconf;
+}
+
+sub get_library
+{
+	my ($self) = @_;
+
+	return $self->{_library};
+}
+
+sub cleanup
+{
+	foreach my $key (@keys)
+	{
+		unlink("ssl/${key}_tmp.key");
+	}
+}
+
+1;
diff --git a/src/test/ssl/t/SSLServer.pm b/src/test/ssl/t/SSL/Server.pm
similarity index 78%
rename from src/test/ssl/t/SSLServer.pm
rename to src/test/ssl/t/SSL/Server.pm
index f5987a003e..ee901855b5 100644
--- a/src/test/ssl/t/SSLServer.pm
+++ b/src/test/ssl/t/SSL/Server.pm
@@ -23,19 +23,39 @@
 # explicitly because an invalid sslcert or sslrootcert, respectively,
 # causes those to be ignored.)
 
-package SSLServer;
+package SSL::Server;
 
 use strict;
 use warnings;
 use PostgresNode;
+use RecursiveCopy;
 use TestLib;
 use File::Basename;
 use File::Copy;
 use Test::More;
+use SSL::Backend::OpenSSL qw(get_new_openssl_backend);
+use SSL::Backend::NSS qw(get_new_nss_backend);
+
+our ($openssl, $nss, $backend);
+
+# The TLS backend which the server is using should be mostly transparent for
+# the user, apart from individual configuration settings, so keep the backend
+# specific things abstracted behind SSL::Server.
+if ($ENV{with_ssl} eq 'openssl')
+{
+	$backend = get_new_openssl_backend();
+	$openssl = 1;
+}
+elsif ($ENV{with_ssl} eq 'nss')
+{
+	$backend = get_new_nss_backend();
+	$nss     = 1;
+}
 
 use Exporter 'import';
 our @EXPORT = qw(
   configure_test_server_for_ssl
+  set_server_cert
   switch_server_cert
   test_connect_fails
   test_connect_ok
@@ -144,12 +164,19 @@ sub configure_test_server_for_ssl
 	close $sslconf;
 
 	# Copy all server certificates and keys, and client root cert, to the data dir
-	copy_files("ssl/server-*.crt", $pgdata);
-	copy_files("ssl/server-*.key", $pgdata);
-	chmod(0600, glob "$pgdata/server-*.key") or die $!;
-	copy_files("ssl/root+client_ca.crt", $pgdata);
-	copy_files("ssl/root_ca.crt",        $pgdata);
-	copy_files("ssl/root+client.crl",    $pgdata);
+	if (defined($openssl))
+	{
+		copy_files("ssl/server-*.crt", $pgdata);
+		copy_files("ssl/server-*.key", $pgdata);
+		chmod(0600, glob "$pgdata/server-*.key") or die $!;
+		copy_files("ssl/root+client_ca.crt", $pgdata);
+		copy_files("ssl/root_ca.crt",        $pgdata);
+		copy_files("ssl/root+client.crl",    $pgdata);
+	}
+	elsif (defined($nss))
+	{
+		RecursiveCopy::copypath("ssl/nss", $pgdata . "/nss") if -e "ssl/nss";
+	}
 
 	# Stop and restart server to load new listen_addresses.
 	$node->restart;
@@ -157,26 +184,51 @@ sub configure_test_server_for_ssl
 	# Change pg_hba after restart because hostssl requires ssl=on
 	configure_hba_for_ssl($node, $servercidr, $authmethod);
 
+	# Finally, perform backend specific configuration
+	$backend->init();
+
 	return;
 }
 
-# Change the configuration to use given server cert file, and reload
-# the server so that the configuration takes effect.
-sub switch_server_cert
+sub ssl_library
+{
+	return $backend->get_library();
+}
+
+sub cleanup
+{
+	$backend->cleanup();
+}
+
+# Change the configuration to use given server cert file,
+sub set_server_cert
 {
 	my $node     = $_[0];
 	my $certfile = $_[1];
 	my $cafile   = $_[2] || "root+client_ca";
+	my $keyfile  = $_[3] || '';
+	my $pwcmd    = $_[4] || '';
 	my $pgdata   = $node->data_dir;
 
+	$keyfile = $certfile if $keyfile eq '';
+
 	open my $sslconf, '>', "$pgdata/sslconfig.conf";
 	print $sslconf "ssl=on\n";
-	print $sslconf "ssl_ca_file='$cafile.crt'\n";
-	print $sslconf "ssl_cert_file='$certfile.crt'\n";
-	print $sslconf "ssl_key_file='$certfile.key'\n";
-	print $sslconf "ssl_crl_file='root+client.crl'\n";
+	print $sslconf $backend->set_server_cert($certfile, $cafile, $keyfile);
+	print $sslconf "ssl_passphrase_command='$pwcmd'\n"
+	  unless $pwcmd eq '';
 	close $sslconf;
+	return;
+}
 
+# Change the configuration to use given server cert file, and reload
+# the server so that the configuration takes effect.
+# Takes the same arguments as set_server_cert, which it calls to do that
+# piece of the work.
+sub switch_server_cert
+{
+	my $node = $_[0];
+	set_server_cert(@_);
 	$node->restart;
 	return;
 }
-- 
2.21.1 (Apple Git-122.3)

From 493e16351ce5c796b367457b0e40efd1d19885ef Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Wed, 28 Oct 2020 11:24:02 +0100
Subject: [PATCH v20 3/5] NSS pg_strong_random support

---
 configure                   |  8 +++++++-
 configure.ac                |  5 ++++-
 src/include/pg_config.h.in  |  3 +++
 src/port/pg_strong_random.c | 40 +++++++++++++++++++++++++++++++++++++
 4 files changed, 54 insertions(+), 2 deletions(-)

diff --git a/configure b/configure
index d99ec29c6a..c15f8953ee 100755
--- a/configure
+++ b/configure
@@ -18426,6 +18426,12 @@ $as_echo "#define USE_WIN32_RANDOM 1" >>confdefs.h
 
   { $as_echo "$as_me:${as_lineno-$LINENO}: result: Windows native" >&5
 $as_echo "Windows native" >&6; }
+elif test x"$USE_NSS_RANDOM" = x"1" ; then
+
+$as_echo "#define USE_NSS_RANDOM 1" >>confdefs.h
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: NSS" >&5
+$as_echo "NSS" >&6; }
 elif test x"$USE_DEV_URANDOM" = x"1" ; then
 
 $as_echo "#define USE_DEV_URANDOM 1" >>confdefs.h
@@ -18435,7 +18441,7 @@ $as_echo "/dev/urandom" >&6; }
 else
   as_fn_error $? "
 no source of strong random numbers was found
-PostgreSQL can use OpenSSL or /dev/urandom as a source of random numbers." "$LINENO" 5
+PostgreSQL can use OpenSSL, NSS, Windows native RNG or /dev/urandom as a source of random numbers." "$LINENO" 5
 fi
 
 # If not set in template file, set bytes to use libc memset()
diff --git a/configure.ac b/configure.ac
index 7b9f4b10a3..01b0ff98b3 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2215,13 +2215,16 @@ if test x"$USE_OPENSSL_RANDOM" = x"1" ; then
 elif test x"$USE_WIN32_RANDOM" = x"1" ; then
   AC_DEFINE(USE_WIN32_RANDOM, 1, [Define to use native Windows API for random number generation])
   AC_MSG_RESULT([Windows native])
+elif test x"$USE_NSS_RANDOM" = x"1" ; then
+  AC_DEFINE(USE_NSS_RANDOM, 1, [Define to use NSS for random number generation])
+  AC_MSG_RESULT([NSS])
 elif test x"$USE_DEV_URANDOM" = x"1" ; then
   AC_DEFINE(USE_DEV_URANDOM, 1, [Define to use /dev/urandom for random number generation])
   AC_MSG_RESULT([/dev/urandom])
 else
   AC_MSG_ERROR([
 no source of strong random numbers was found
-PostgreSQL can use OpenSSL or /dev/urandom as a source of random numbers.])
+PostgreSQL can use OpenSSL, NSS, Windows native RNG or /dev/urandom as a source of random numbers.])
 fi
 
 # If not set in template file, set bytes to use libc memset()
diff --git a/src/include/pg_config.h.in b/src/include/pg_config.h.in
index 31f808398c..73c39b449c 100644
--- a/src/include/pg_config.h.in
+++ b/src/include/pg_config.h.in
@@ -896,6 +896,9 @@
 /* Define to build with NSS support (--with-nss) */
 #undef USE_NSS
 
+/* Define to use NSS for random number generation */
+#undef USE_NSS_RANDOM
+
 /* Define to 1 to use software CRC-32C implementation (slicing-by-8). */
 #undef USE_SLICING_BY_8_CRC32C
 
diff --git a/src/port/pg_strong_random.c b/src/port/pg_strong_random.c
index 6d85f50b7c..99c1d17e9a 100644
--- a/src/port/pg_strong_random.c
+++ b/src/port/pg_strong_random.c
@@ -30,6 +30,21 @@
 #ifdef USE_WIN32_RANDOM
 #include <wincrypt.h>
 #endif
+#ifdef USE_NSS_RANDOM
+#define pg_BITS_PER_BYTE BITS_PER_BYTE
+#undef BITS_PER_BYTE
+#define NO_NSPR_10_SUPPORT
+#include <nss/nss.h>
+#include <nss/pk11pub.h>
+#if defined(BITS_PER_BYTE)
+#if BITS_PER_BYTE != pg_BITS_PER_BYTE
+#error "incompatible byte widths between NSPR and postgres"
+#endif
+#else
+#define BITS_PER_BYTE pg_BITS_PER_BYTE
+#endif
+#undef pg_BITS_PER_BYTE
+#endif
 
 #ifdef USE_WIN32_RANDOM
 /*
@@ -114,6 +129,8 @@ pg_strong_random_init(void)
 #elif defined(USE_DEV_URANDOM)
 	/* no initialization needed for /dev/urandom */
 
+#elif defined(USE_NSS_RANDOM)
+	/* TODO: set up NSS context here */
 #else
 #error no source of random numbers configured
 #endif
@@ -202,6 +219,29 @@ pg_strong_random(void *buf, size_t len)
 	}
 	return false;
 
+#elif defined(USE_NSS_RANDOM)
+	NSSInitParameters params;
+	NSSInitContext *nss_context;
+	SECStatus	status;
+
+	memset(&params, 0, sizeof(params));
+	params.length = sizeof(params);
+	nss_context = NSS_InitContext("", "", "", "", &params,
+								  NSS_INIT_READONLY | NSS_INIT_NOCERTDB |
+								  NSS_INIT_NOMODDB | NSS_INIT_FORCEOPEN |
+								  NSS_INIT_NOROOTINIT | NSS_INIT_PK11RELOAD);
+
+	if (!nss_context)
+		return false;
+
+	status = PK11_GenerateRandom(buf, len);
+	NSS_ShutdownContext(nss_context);
+
+	if (status == SECSuccess)
+		return true;
+
+	return false;
+
 	/*
 	 * Read /dev/urandom ourselves.
 	 */
-- 
2.21.1 (Apple Git-122.3)

From 3f0a4467f48afd730e971e4da2098dc5033a2188 Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Wed, 28 Oct 2020 11:26:31 +0100
Subject: [PATCH v20 4/5] NSS Documentation

---
 doc/src/sgml/acronyms.sgml     | 43 +++++++++++++++++++
 doc/src/sgml/config.sgml       | 28 ++++++++++--
 doc/src/sgml/installation.sgml | 30 ++++++++++++-
 doc/src/sgml/libpq.sgml        | 27 ++++++++++--
 doc/src/sgml/runtime.sgml      | 78 ++++++++++++++++++++++++++++++++--
 5 files changed, 195 insertions(+), 11 deletions(-)

diff --git a/doc/src/sgml/acronyms.sgml b/doc/src/sgml/acronyms.sgml
index 4e5ec983c0..4f6f0cf353 100644
--- a/doc/src/sgml/acronyms.sgml
+++ b/doc/src/sgml/acronyms.sgml
@@ -441,6 +441,28 @@
     </listitem>
    </varlistentry>
 
+   <varlistentry>
+    <term><acronym>NSPR</acronym></term>
+    <listitem>
+     <para>
+      <ulink
+      url="https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSPR">
+      Netscape Portable Runtime</ulink>
+     </para>
+    </listitem>
+   </varlistentry>
+
+   <varlistentry>
+    <term><acronym>NSS</acronym></term>
+    <listitem>
+     <para>
+      <ulink
+      url="https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS">
+      Network Security Services</ulink>
+     </para>
+    </listitem>
+   </varlistentry>
+
    <varlistentry>
     <term><acronym>ODBC</acronym></term>
     <listitem>
@@ -539,6 +561,17 @@
     </listitem>
    </varlistentry>
 
+   <varlistentry>
+    <term><acronym>PKCS#12</acronym></term>
+    <listitem>
+     <para>
+      <ulink
+      url="https://en.wikipedia.org/wiki/PKCS_12">
+      Public-Key Cryptography Standards #12</ulink>
+     </para>
+    </listitem>
+   </varlistentry>
+
    <varlistentry>
     <term><acronym>PL</acronym></term>
     <listitem>
@@ -684,6 +717,16 @@
     </listitem>
    </varlistentry>
 
+   <varlistentry>
+    <term><acronym>TLS</acronym></term>
+    <listitem>
+     <para>
+      <ulink url="https://sv.wikipedia.org/wiki/Transport_Layer_Security">
+      Transport Layer Security</ulink>
+     </para>
+    </listitem>
+   </varlistentry>
+
    <varlistentry>
     <term><acronym>TOAST</acronym></term>
     <listitem>
diff --git a/doc/src/sgml/config.sgml b/doc/src/sgml/config.sgml
index a632cf98ba..1a6d4a36bf 100644
--- a/doc/src/sgml/config.sgml
+++ b/doc/src/sgml/config.sgml
@@ -1208,6 +1208,23 @@ include_dir 'conf.d'
       </listitem>
      </varlistentry>
 
+     <varlistentry id="guc-ssl-database" xreflabel="ssl_database">
+      <term><varname>ssl_database</varname> (<type>string</type>)
+      <indexterm>
+       <primary><varname>ssl_database</varname> configuration parameter</primary>
+      </indexterm>
+      </term>
+      <listitem>
+       <para>
+        Specifies the name of the file containing the server certificates and
+        keys when using <productname>NSS</productname> for <acronym>SSL</acronym>
+        connections. This parameter can only be set in the
+        <filename>postgresql.conf</filename> file or on the server command
+        line.
+       </para>
+      </listitem>
+     </varlistentry>
+
      <varlistentry id="guc-ssl-ciphers" xreflabel="ssl_ciphers">
       <term><varname>ssl_ciphers</varname> (<type>string</type>)
       <indexterm>
@@ -1224,7 +1241,9 @@ include_dir 'conf.d'
         connections using TLS version 1.2 and lower are affected.  There is
         currently no setting that controls the cipher choices used by TLS
         version 1.3 connections.  The default value is
-        <literal>HIGH:MEDIUM:+3DES:!aNULL</literal>.  The default is usually a
+        <literal>HIGH:MEDIUM:+3DES:!aNULL</literal> for servers which have
+        been built with <productname>OpenSSL</productname> as the
+        <acronym>SSL</acronym> library.  The default is usually a
         reasonable choice unless you have specific security requirements.
        </para>
 
@@ -1426,8 +1445,11 @@ include_dir 'conf.d'
        <para>
         Sets an external command to be invoked when a passphrase for
         decrypting an SSL file such as a private key needs to be obtained.  By
-        default, this parameter is empty, which means the built-in prompting
-        mechanism is used.
+        default, this parameter is empty. When the server is using
+        <productname>OpenSSL</productname>, this means the built-in prompting
+        mechanism is used. When using <productname>NSS</productname>, there is
+        no default prompting so a blank callback will be used returning an
+        empty password.
        </para>
        <para>
         The command must print the passphrase to the standard output and exit
diff --git a/doc/src/sgml/installation.sgml b/doc/src/sgml/installation.sgml
index 0ac1cb9999..bd09124fb0 100644
--- a/doc/src/sgml/installation.sgml
+++ b/doc/src/sgml/installation.sgml
@@ -250,7 +250,7 @@ su - postgres
 
     <listitem>
      <para>
-      You need <productname>OpenSSL</productname>, if you want to support
+      You need a supported <acronym>SSL</acronym> library, if you want to support
       encrypted client connections.  <productname>OpenSSL</productname> is
       also required for random number generation on platforms that do not
       have <filename>/dev/urandom</filename> (except Windows).  The minimum
@@ -966,6 +966,31 @@ build-postgresql:
        </listitem>
       </varlistentry>
 
+      <varlistentry>
+       <term><option>--with-nss</option>
+       <indexterm>
+        <primary>NSS</primary>
+        <secondary>NSPR</secondary>
+        <seealso>SSL</seealso>
+       </indexterm>
+       </term>
+       <listitem>
+        <para>
+         Build with support for <acronym>SSL</acronym> (encrypted)
+         connections using <productname>NSS</productname>. This requires the
+         <productname>NSS</productname> package to be installed. Additionally,
+         <productname>NSS</productname> requires <productname>NSPR</productname>
+         to be installed. <filename>configure</filename> will check for the
+         required header files and libraries to make sure that your
+         <productname>NSS</productname> installation is sufficient before
+         proceeding.
+        </para>
+        <para>
+         This option is incompatible with <literal>--with-openssl</literal>.
+        </para>
+       </listitem>
+      </varlistentry>
+
       <varlistentry>
        <term><option>--with-openssl</option>
        <indexterm>
@@ -982,6 +1007,9 @@ build-postgresql:
          your <productname>OpenSSL</productname> installation is sufficient
          before proceeding.
         </para>
+        <para>
+         This option is incompatible with <literal>--with-nss</literal>.
+        </para>
        </listitem>
       </varlistentry>
 
diff --git a/doc/src/sgml/libpq.sgml b/doc/src/sgml/libpq.sgml
index 9d4b6ab4a8..bd570deb44 100644
--- a/doc/src/sgml/libpq.sgml
+++ b/doc/src/sgml/libpq.sgml
@@ -2459,6 +2459,8 @@ void *PQsslStruct(const PGconn *conn, const char *struct_name);
       </para>
       <para>
        The struct(s) available depend on the SSL implementation in use.
+      </para>
+      <para>
        For <productname>OpenSSL</productname>, there is one struct,
        available under the name "OpenSSL", and it returns a pointer to the
        <productname>OpenSSL</productname> <literal>SSL</literal> struct.
@@ -2482,9 +2484,14 @@ void *PQsslStruct(const PGconn *conn, const char *struct_name);
 ]]></programlisting>
       </para>
       <para>
-       This structure can be used to verify encryption levels, check server
-       certificates, and more. Refer to the <productname>OpenSSL</productname>
-       documentation for information about this structure.
+       For <productname>NSS</productname>, there is one struct available under
+       the name "NSS", and it returns a pointer to the
+       <productname>NSS</productname> <literal>PRFileDesc</literal>.
+      </para>
+      <para>
+       These structures can be used to verify encryption levels, check server
+       certificates, and more. Refer to the <acronym>SSL</acronym> library
+       documentation for information about these structures.
       </para>
      </listitem>
     </varlistentry>
@@ -2511,6 +2518,10 @@ void *PQgetssl(const PGconn *conn);
        <xref linkend="libpq-PQsslInUse"/> instead, and for more details about the
        connection, use <xref linkend="libpq-PQsslAttribute"/>.
       </para>
+      <para>
+       This function returns <literal>NULL</literal> when <acronym>SSL</acronym>
+       librariaes other than <productname>OpenSSL</productname> are used.
+      </para>
      </listitem>
     </varlistentry>
 
@@ -7943,6 +7954,11 @@ void PQinitOpenSSL(int do_ssl, int do_crypto);
        before first opening a database connection.  Also be sure that you
        have done that initialization before opening a database connection.
       </para>
+
+      <para>
+       This function does nothing when using <productname>NSS</productname> as
+       the <acronym>SSL</acronym> library.
+      </para>
      </listitem>
     </varlistentry>
 
@@ -7969,6 +7985,11 @@ void PQinitSSL(int do_ssl);
        might be preferable for applications that need to work with older
        versions of <application>libpq</application>.
       </para>
+
+      <para>
+       This function does nothing when using <productname>NSS</productname> as
+       the <acronym>SSL</acronym> library.
+      </para>
      </listitem>
     </varlistentry>
    </variablelist>
diff --git a/doc/src/sgml/runtime.sgml b/doc/src/sgml/runtime.sgml
index 17e938148c..daa99cea74 100644
--- a/doc/src/sgml/runtime.sgml
+++ b/doc/src/sgml/runtime.sgml
@@ -2183,15 +2183,21 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
 
   <indexterm zone="ssl-tcp">
    <primary>SSL</primary>
+   <secondary>TLS</secondary>
   </indexterm>
 
   <para>
    <productname>PostgreSQL</productname> has native support for using
    <acronym>SSL</acronym> connections to encrypt client/server communications
    for increased security. This requires that
-   <productname>OpenSSL</productname> is installed on both client and
+   a supported TLS library is installed on both client and
    server systems and that support in <productname>PostgreSQL</productname> is
    enabled at build time (see <xref linkend="installation"/>).
+   Supported libraries are <productname>OpenSSL</productname> and
+   <productname>NSS</productname>. The terms <acronym>SSL</acronym> and
+   <acronym>TLS</acronym> are often used interchangeably to mean a secure
+   connection using a <acronym>TLS</acronym> protocol, even though
+   <acronym>SSL</acronym> protocols are no longer supported.
   </para>
 
   <sect2 id="ssl-setup">
@@ -2211,8 +2217,13 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
   </para>
 
   <para>
-   To start in <acronym>SSL</acronym> mode, files containing the server certificate
-   and private key must exist.  By default, these files are expected to be
+   To start in <acronym>SSL</acronym> mode, a server certificate
+   and private key must exist. The below sections on the different libraries
+   will discuss how to configure these.
+  </para>
+   
+  <para>
+   By default, these files are expected to be
    named <filename>server.crt</filename> and <filename>server.key</filename>, respectively, in
    the server's data directory, but other names and locations can be specified
    using the configuration parameters <xref linkend="guc-ssl-cert-file"/>
@@ -2302,6 +2313,18 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
   </note>
   </sect2>
 
+  <sect2 id="ssl-nss-config">
+   <title>NSS Configuration</title>
+
+  <para>
+   <productname>PostgreSQL</productname> will look for certificates and keys
+   in the <productname>NSS</productname> database specified by the parameter
+   <xref linkend="guc-ssl-database"/> in <filename>postgresql.conf</filename>.
+   The parameters for certificate and key filenames are used to identify the
+   nicknames in the database.
+  </para>
+  </sect2>
+
   <sect2 id="ssl-client-certificates">
    <title>Using Client Certificates</title>
 
@@ -2376,7 +2399,7 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
   </sect2>
 
   <sect2 id="ssl-server-files">
-   <title>SSL Server File Usage</title>
+   <title>SSL Server File Parameter Usage</title>
 
    <para>
     <xref linkend="ssl-file-usage"/> summarizes the files that are
@@ -2423,6 +2446,14 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
       <entry>client certificate must not be on this list</entry>
      </row>
 
+     <row>
+      <entry><xref linkend="guc-ssl-database"/></entry>
+      <entry>certificate database</entry>
+      <entry>contains server certificates, keys and revocation lists; only
+      used when <productname>PostgreSQL</productname> is built with support
+      for <productname>NSS</productname>.</entry>
+     </row>
+
     </tbody>
    </tgroup>
   </table>
@@ -2550,6 +2581,45 @@ openssl x509 -req -in server.csr -text -days 365 \
    </para>
   </sect2>
 
+  <sect2 id="nss-certificate-database">
+   <title>NSS Certificate Databases</title>
+
+   <para>
+    When using <productname>NSS</productname>, all certificates and keys must
+    be loaded into an <productname>NSS</productname> certificate database.
+   </para>
+
+   <para>
+    To create a new <productname>NSS</productname> certificate database and
+    load the certificates created in <xref linkend="ssl-certificate-creation" />,
+    use the following <productname>NSS</productname> commands:
+<programlisting>
+certutil -d "sql:server.db" -N --empty-password
+certutil -d "sql:server.db" -A -n server.crt -i server.crt -t "CT,C,C"
+certutil -d "sql:server.db" -A -n root.crt -i root.crt -t "CT,C,C"
+</programlisting>
+    This will give the certificate the filename as the nickname identifier in
+    the database which is created as <filename>server.db</filename>.
+   </para>
+   <para>
+    Then load the server key, which require converting it to
+    <acronym>PKCS#12</acronym> format using the
+    <productname>OpenSSL</productname> tools:
+<programlisting>
+openssl pkcs12 -export -out server.pfx -inkey server.key -in server.crt \
+  -certfile root.crt -passout pass:
+pk12util -i server.pfx -d server.db -W ''
+</programlisting>
+   </para>
+   <para>
+    Finally a certificate revocation list can be loaded with the following
+    commands:
+<programlisting>
+crlutil -I -i server.crl -d server.db -B
+</programlisting>
+   </para>
+  </sect2>
+
  </sect1>
 
  <sect1 id="gssapi-enc">
-- 
2.21.1 (Apple Git-122.3)

From fc7bbc41e50f8c0ff49bea998c5e53f421382071 Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Wed, 28 Oct 2020 11:34:37 +0100
Subject: [PATCH v20 5/5] NSS contrib modules

---
 contrib/Makefile            |   2 +-
 contrib/pgcrypto/Makefile   |   7 +-
 contrib/pgcrypto/nss.c      | 773 ++++++++++++++++++++++++++++++++++++
 contrib/sslinfo/sslinfo.c   |  32 ++
 doc/src/sgml/pgcrypto.sgml  |  38 +-
 doc/src/sgml/sslinfo.sgml   |  12 +-
 src/tools/msvc/Install.pm   |   3 +-
 src/tools/msvc/Mkvcbuild.pm |  12 +-
 8 files changed, 864 insertions(+), 15 deletions(-)
 create mode 100644 contrib/pgcrypto/nss.c

diff --git a/contrib/Makefile b/contrib/Makefile
index 7a4866e338..c2232e5a4d 100644
--- a/contrib/Makefile
+++ b/contrib/Makefile
@@ -52,7 +52,7 @@ SUBDIRS = \
 		unaccent	\
 		vacuumlo
 
-ifeq ($(with_openssl),yes)
+ifneq ($(with_ssl),no)
 SUBDIRS += sslinfo
 else
 ALWAYS_SUBDIRS += sslinfo
diff --git a/contrib/pgcrypto/Makefile b/contrib/pgcrypto/Makefile
index 61eabd2fc0..28b54d321b 100644
--- a/contrib/pgcrypto/Makefile
+++ b/contrib/pgcrypto/Makefile
@@ -7,11 +7,14 @@ INT_TESTS = sha2
 OSSL_SRCS = openssl.c pgp-mpi-openssl.c
 OSSL_TESTS = sha2 des 3des cast5
 
+NSS_SRCS = nss.c pgp-mpi-internal.c imath.c blf.c
+NSS_TESTS = sha2 des 3des
+
 ZLIB_TST = pgp-compression
 ZLIB_OFF_TST = pgp-zlib-DISABLED
 
-CF_SRCS = $(if $(subst no,,$(with_openssl)), $(OSSL_SRCS), $(INT_SRCS))
-CF_TESTS = $(if $(subst no,,$(with_openssl)), $(OSSL_TESTS), $(INT_TESTS))
+CF_SRCS = $(if $(findstring openssl, $(with_ssl)), $(OSSL_SRCS), $(if $(findstring nss, $(with_ssl)), $(NSS_SRCS), $(INT_SRCS)))
+CF_TESTS = $(if $(findstring openssl, $(with_ssl)), $(OSSL_TESTS), $(if $(findstring nss, $(with_ssl)), $(NSS_TESTS), $(INT_TESTS)))
 CF_PGP_TESTS = $(if $(subst no,,$(with_zlib)), $(ZLIB_TST), $(ZLIB_OFF_TST))
 
 SRCS = \
diff --git a/contrib/pgcrypto/nss.c b/contrib/pgcrypto/nss.c
new file mode 100644
index 0000000000..da66152d65
--- /dev/null
+++ b/contrib/pgcrypto/nss.c
@@ -0,0 +1,773 @@
+/*-------------------------------------------------------------------------
+ *
+ * nss.c
+ *	  Wrapper for using NSS as a backend for pgcrypto PX
+ *
+ *
+ * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ *	  contrib/pgcrypto/nss.c
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#include "postgres.h"
+
+#include "px.h"
+#include "blf.h"
+#include "utils/memutils.h"
+
+/*
+ * BITS_PER_BYTE is also defined in the NSPR header files, so we need to undef
+ * our version to avoid compiler warnings on redefinition.
+ */
+#define pg_BITS_PER_BYTE BITS_PER_BYTE
+#undef BITS_PER_BYTE
+
+#include <nss/nss.h>
+#include <nss/hasht.h>
+#include <nss/pk11func.h>
+#include <nss/pk11pub.h>
+#include <nss/secitem.h>
+#include <nss/sechash.h>
+#include <nss/secoid.h>
+#include <nss/secerr.h>
+
+/*
+ * Ensure that the colliding definitions match, else throw an error. In case
+ * NSPR has removed the definition for some reason, make sure to put ours
+ * back again.
+ */
+#if defined(BITS_PER_BYTE)
+#if BITS_PER_BYTE != pg_BITS_PER_BYTE
+#error "incompatible byte widths between NSPR and postgres"
+#endif
+#else
+#define BITS_PER_BYTE pg_BITS_PER_BYTE
+#endif
+#undef pg_BITS_PER_BYTE
+
+/*
+ * Define our own mechanisms for Blowfish as it's not implemented by NSS.
+ */
+#define BLOWFISH_CBC	(1)
+#define BLOWFISH_ECB	(2)
+
+/*
+ * Data structures for recording cipher implementations as well as ongoing
+ * cipher operations.
+ */
+typedef struct nss_digest
+{
+	NSSInitContext *context;
+	PK11Context *hash_context;
+	HASH_HashType hash_type;
+}			nss_digest;
+
+typedef struct cipher_implementation
+{
+	/* Function pointers to cipher operations */
+	int			(*init) (PX_Cipher *pxc, const uint8 *key, unsigned klen, const uint8 *iv);
+	unsigned	(*get_block_size) (PX_Cipher *pxc);
+	unsigned	(*get_key_size) (PX_Cipher *pxc);
+	unsigned	(*get_iv_size) (PX_Cipher *pxc);
+	int			(*encrypt) (PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res);
+	int			(*decrypt) (PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res);
+	void		(*free) (PX_Cipher *pxc);
+
+	/* The mechanism describing the cipher used */
+	union
+	{
+		CK_MECHANISM_TYPE nss;
+		CK_ULONG	internal;
+	}			mechanism;
+	int			keylen;
+	bool		is_nss;
+}			cipher_implementation;
+
+typedef struct nss_cipher
+{
+	const cipher_implementation *impl;
+	NSSInitContext *context;
+	PK11Context *crypt_context;
+	SECItem    *params;
+
+	PK11SymKey *encrypt_key;
+	PK11SymKey *decrypt_key;
+}			nss_cipher;
+
+typedef struct internal_cipher
+{
+	const cipher_implementation *impl;
+	BlowfishContext context;
+}			internal_cipher;
+
+typedef struct nss_cipher_ref
+{
+	const char *name;
+	const cipher_implementation *impl;
+}			nss_cipher_ref;
+
+/*
+ * Prototypes
+ */
+static unsigned nss_get_iv_size(PX_Cipher *pxc);
+static unsigned nss_get_block_size(PX_Cipher *pxc);
+
+/*
+ * nss_GetHashOidTagByHashType
+ *
+ * Returns the corresponding SECOidTag for the passed hash type. NSS 3.43
+ * includes HASH_GetHashOidTagByHashType for this purpose, but at the time of
+ * writing is not commonly available so we need our own version till then.
+ */
+static SECOidTag
+nss_GetHashOidTagByHashType(HASH_HashType type)
+{
+	if (type == HASH_AlgMD2)
+		return SEC_OID_MD2;
+	if (type == HASH_AlgMD5)
+		return SEC_OID_MD5;
+	if (type == HASH_AlgSHA1)
+		return SEC_OID_SHA1;
+	if (type == HASH_AlgSHA224)
+		return SEC_OID_SHA224;
+	if (type == HASH_AlgSHA256)
+		return SEC_OID_SHA256;
+	if (type == HASH_AlgSHA384)
+		return SEC_OID_SHA384;
+	if (type == HASH_AlgSHA512)
+		return SEC_OID_SHA512;
+
+	return SEC_OID_UNKNOWN;
+}
+
+static unsigned
+nss_digest_block_size(PX_MD *pxmd)
+{
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+	const SECHashObject *object;
+
+	object = HASH_GetHashObject(digest->hash_type);
+	return object->blocklength;
+}
+
+static unsigned
+nss_digest_result_size(PX_MD *pxmd)
+{
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+	const SECHashObject *object;
+
+	object = HASH_GetHashObject(digest->hash_type);
+	return object->length;
+}
+
+static void
+nss_digest_free(PX_MD *pxmd)
+{
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+	PRBool		free_ctx = PR_TRUE;
+
+	PK11_DestroyContext(digest->hash_context, free_ctx);
+	NSS_ShutdownContext(digest->context);
+}
+
+static void
+nss_digest_update(PX_MD *pxmd, const uint8 *data, unsigned dlen)
+{
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+
+	PK11_DigestOp(digest->hash_context, data, dlen);
+}
+
+static void
+nss_digest_reset(PX_MD *pxmd)
+{
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+
+	PK11_DigestBegin(digest->hash_context);
+}
+
+static void
+nss_digest_finish(PX_MD *pxmd, uint8 *dst)
+{
+	unsigned int outlen;
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+	const SECHashObject *object;
+
+	object = HASH_GetHashObject(digest->hash_type);
+	PK11_DigestFinal(digest->hash_context, dst, &outlen, object->length);
+}
+
+int
+px_find_digest(const char *name, PX_MD **res)
+{
+	PX_MD	   *pxmd;
+	NSSInitParameters params;
+	NSSInitContext *nss_context;
+	bool		found = false;
+	nss_digest *digest;
+	SECStatus	status;
+	SECOidData *hash;
+	HASH_HashType t;
+
+	/*
+	 * Initialize our own NSS context without a database backing it.
+	 */
+	memset(&params, 0, sizeof(params));
+	params.length = sizeof(params);
+	nss_context = NSS_InitContext("", "", "", "", &params,
+								  NSS_INIT_READONLY | NSS_INIT_NOCERTDB |
+								  NSS_INIT_NOMODDB | NSS_INIT_FORCEOPEN |
+								  NSS_INIT_NOROOTINIT | NSS_INIT_PK11RELOAD);
+
+	/*
+	 * There is no API function for looking up a digest algorithm from a name
+	 * string, but there is a publicly accessible array which can be scanned
+	 * for the name.
+	 */
+	for (t = HASH_AlgNULL + 1; t < HASH_AlgTOTAL; t++)
+	{
+		SECOidTag	hash_oid;
+		char	   *p;
+
+		hash_oid = nss_GetHashOidTagByHashType(t);
+
+		if (hash_oid == SEC_OID_UNKNOWN)
+			return PXE_NO_HASH;
+
+		hash = SECOID_FindOIDByTag(hash_oid);
+		if (pg_strcasecmp(hash->desc, name) == 0)
+		{
+			found = true;
+			break;
+		}
+
+		/*
+		 * NSS saves the algorithm names using SHA-xxx notation whereas
+		 * OpenSSL use SHAxxx. To make sure the user finds the requested
+		 * algorithm let's remove the dash and compare that spelling as well.
+		 */
+		if ((p = strchr(hash->desc, '-')) != NULL)
+		{
+			char		tmp[12];
+
+			memcpy(tmp, hash->desc, p - hash->desc);
+			memcpy(tmp + (p - hash->desc), p + 1, strlen(hash->desc) - (p - hash->desc) + 1);
+			if (pg_strcasecmp(tmp, name) == 0)
+			{
+				found = true;
+				break;
+			}
+		}
+	}
+
+	if (!found)
+		return PXE_NO_HASH;
+
+	digest = palloc(sizeof(*digest));
+
+	digest->context = nss_context;
+	digest->hash_context = PK11_CreateDigestContext(hash->offset);
+	digest->hash_type = t;
+	if (digest->hash_context == NULL)
+	{
+		pfree(digest);
+		return -1;
+	}
+
+	status = PK11_DigestBegin(digest->hash_context);
+	if (status != SECSuccess)
+	{
+		PK11_DestroyContext(digest->hash_context, PR_TRUE);
+		pfree(digest);
+		return -1;
+	}
+
+	pxmd = palloc(sizeof(*pxmd));
+	pxmd->result_size = nss_digest_result_size;
+	pxmd->block_size = nss_digest_block_size;
+	pxmd->reset = nss_digest_reset;
+	pxmd->update = nss_digest_update;
+	pxmd->finish = nss_digest_finish;
+	pxmd->free = nss_digest_free;
+	pxmd->p.ptr = (void *) digest;
+
+	*res = pxmd;
+
+	return 0;
+}
+
+static int
+bf_init(PX_Cipher *pxc, const uint8 *key, unsigned klen, const uint8 *iv)
+{
+	internal_cipher *cipher = (internal_cipher *) pxc->ptr;
+
+	blowfish_setkey(&cipher->context, key, klen);
+	if (iv)
+		blowfish_setiv(&cipher->context, iv);
+
+	return 0;
+}
+
+static int
+bf_encrypt(PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res)
+{
+	internal_cipher *cipher = (internal_cipher *) pxc->ptr;
+	uint8	   *buf;
+
+	if (dlen == 0)
+		return 0;
+
+	if (dlen & 7)
+		return PXE_NOTBLOCKSIZE;
+
+	buf = palloc(dlen);
+	memcpy(buf, data, dlen);
+
+	if (cipher->impl->mechanism.internal == BLOWFISH_ECB)
+		blowfish_encrypt_ecb(buf, dlen, &cipher->context);
+	else
+		blowfish_encrypt_cbc(buf, dlen, &cipher->context);
+
+	memcpy(res, buf, dlen);
+	pfree(buf);
+
+	return 0;
+}
+
+static int
+bf_decrypt(PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res)
+{
+	internal_cipher *cipher = (internal_cipher *) pxc->ptr;
+
+	if (dlen == 0)
+		return 0;
+
+	if (dlen & 7)
+		return PXE_NOTBLOCKSIZE;
+
+	memcpy(res, data, dlen);
+	if (cipher->impl->mechanism.internal == BLOWFISH_ECB)
+		blowfish_decrypt_ecb(res, dlen, &cipher->context);
+	else
+		blowfish_decrypt_cbc(res, dlen, &cipher->context);
+
+	return 0;
+}
+
+static void
+bf_free(PX_Cipher *pxc)
+{
+	internal_cipher *cipher = (internal_cipher *) pxc->ptr;
+
+	pfree(cipher);
+	pfree(pxc);
+}
+
+static int
+nss_symkey_blockcipher_init(PX_Cipher *pxc, const uint8 *key, unsigned klen,
+							const uint8 *iv)
+{
+	nss_cipher *cipher = (nss_cipher *) pxc->ptr;
+	SECItem		iv_item;
+	unsigned char *iv_item_data;
+	SECItem		key_item;
+	int			keylen;
+	PK11SlotInfo *slot;
+
+	if (cipher->impl->mechanism.nss == CKM_AES_CBC ||
+		cipher->impl->mechanism.nss == CKM_AES_ECB)
+	{
+		if (klen <= 128 / 8)
+			keylen = 128 / 8;
+		else if (klen <= 192 / 8)
+			keylen = 192 / 8;
+		else if (klen <= 256 / 8)
+			keylen = 256 / 8;
+		else
+			return PXE_CIPHER_INIT;
+	}
+	else
+		keylen = cipher->impl->keylen;
+
+	key_item.type = siBuffer;
+	key_item.data = (unsigned char *) key;
+	key_item.len = keylen;
+
+	/*
+	 * If hardware acceleration is configured in NSS one can theoretically get
+	 * a better slot by calling PK11_GetBestSlot() with the mechanism passed
+	 * to it. Unless there are complaints, using the simpler API will make
+	 * error handling easier though.
+	 */
+	slot = PK11_GetInternalSlot();
+	if (!slot)
+		return PXE_CIPHER_INIT;
+
+	/*
+	 * The key must be set up for the operation, and since we don't know at
+	 * this point whether we are asked to encrypt or decrypt we need to store
+	 * both versions.
+	 */
+	cipher->decrypt_key = PK11_ImportSymKey(slot, cipher->impl->mechanism.nss,
+											PK11_OriginUnwrap,
+											CKA_DECRYPT, &key_item,
+											NULL);
+	cipher->encrypt_key = PK11_ImportSymKey(slot, cipher->impl->mechanism.nss,
+											PK11_OriginUnwrap,
+											CKA_ENCRYPT, &key_item,
+											NULL);
+	PK11_FreeSlot(slot);
+
+	if (!cipher->decrypt_key || !cipher->encrypt_key)
+		return PXE_CIPHER_INIT;
+
+	if (iv)
+	{
+		iv_item.type = siBuffer;
+		iv_item.data = (unsigned char *) iv;
+		iv_item.len = nss_get_iv_size(pxc);
+	}
+	else
+	{
+		/*
+		 * The documentation states that either passing .data = 0; .len = 0;
+		 * in the iv_item, or NULL as iv_item, to PK11_ParamFromIV should be
+		 * done when IV is missing. That however leads to segfaults in the
+		 * library, the workaround that works in modern  library versions is
+		 * to pass in a keysized zeroed out IV.
+		 */
+		iv_item_data = palloc0(nss_get_iv_size(pxc));
+		iv_item.type = siBuffer;
+		iv_item.data = iv_item_data;
+		iv_item.len = nss_get_iv_size(pxc);
+	}
+
+	cipher->params = PK11_ParamFromIV(cipher->impl->mechanism.nss, &iv_item);
+
+	/* If we had to make a mock IV, free it once made into a param */
+	if (!iv)
+		pfree(iv_item_data);
+
+	if (cipher->params == NULL)
+		return PXE_CIPHER_INIT;
+
+	return 0;
+}
+
+static int
+nss_decrypt(PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res)
+{
+	nss_cipher *cipher = (nss_cipher *) pxc->ptr;
+	SECStatus	status;
+	int			outlen;
+
+	if (!cipher->crypt_context)
+	{
+		cipher->crypt_context =
+			PK11_CreateContextBySymKey(cipher->impl->mechanism.nss, CKA_DECRYPT,
+									   cipher->decrypt_key, cipher->params);
+	}
+
+	status = PK11_CipherOp(cipher->crypt_context, res, &outlen, dlen, data, dlen);
+	if (status != SECSuccess)
+		return PXE_DECRYPT_FAILED;
+
+	return 0;
+}
+
+static int
+nss_encrypt(PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res)
+{
+	nss_cipher *cipher = (nss_cipher *) pxc->ptr;
+	SECStatus	status;
+	int			outlen;
+
+	if (!cipher->crypt_context)
+	{
+		cipher->crypt_context =
+			PK11_CreateContextBySymKey(cipher->impl->mechanism.nss, CKA_ENCRYPT,
+									   cipher->decrypt_key, cipher->params);
+	}
+
+	status = PK11_CipherOp(cipher->crypt_context, res, &outlen, dlen, data, dlen);
+
+	if (status != SECSuccess)
+		return PXE_DECRYPT_FAILED;
+
+	return 0;
+}
+
+static void
+nss_free(PX_Cipher *pxc)
+{
+	nss_cipher *cipher = pxc->ptr;
+	PRBool		free_ctx = PR_TRUE;
+
+	PK11_FreeSymKey(cipher->encrypt_key);
+	PK11_FreeSymKey(cipher->decrypt_key);
+	PK11_DestroyContext(cipher->crypt_context, free_ctx);
+	NSS_ShutdownContext(cipher->context);
+	pfree(cipher);
+
+	pfree(pxc);
+}
+
+static unsigned
+nss_get_block_size(PX_Cipher *pxc)
+{
+	nss_cipher *cipher = pxc->ptr;
+
+	return PK11_GetBlockSize(cipher->impl->mechanism.nss, NULL);
+}
+
+static unsigned
+nss_get_key_size(PX_Cipher *pxc)
+{
+	nss_cipher *cipher = pxc->ptr;
+
+	return cipher->impl->keylen;
+}
+
+static unsigned
+nss_get_iv_size(PX_Cipher *pxc)
+{
+	nss_cipher *cipher = pxc->ptr;
+
+	return PK11_GetIVLength(cipher->impl->mechanism.nss);
+}
+
+static unsigned
+bf_get_block_size(PX_Cipher *pxc)
+{
+	return 8;
+}
+
+static unsigned
+bf_get_key_size(PX_Cipher *pxc)
+{
+	return 448 / 8;
+}
+
+static unsigned
+bf_get_iv_size(PX_Cipher *pxc)
+{
+	return 8;
+}
+
+/*
+ * Cipher Implementations
+ */
+static const cipher_implementation nss_des_cbc = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_DES_CBC,
+	.keylen = 8,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_des_ecb = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_DES_ECB,
+	.keylen = 8,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_des3_cbc = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_DES3_CBC,
+	.keylen = 24,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_des3_ecb = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_DES3_ECB,
+	.keylen = 24,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_aes_cbc = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_AES_CBC,
+	.keylen = 32,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_aes_ecb = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_AES_ECB,
+	.keylen = 32,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_bf_ecb = {
+	.init = bf_init,
+	.get_block_size = bf_get_block_size,
+	.get_key_size = bf_get_key_size,
+	.get_iv_size = bf_get_iv_size,
+	.encrypt = bf_encrypt,
+	.decrypt = bf_decrypt,
+	.free = bf_free,
+	.mechanism.internal = BLOWFISH_ECB,
+	.keylen = 56,
+	.is_nss = false
+};
+
+static const cipher_implementation nss_bf_cbc = {
+	.init = bf_init,
+	.get_block_size = bf_get_block_size,
+	.get_key_size = bf_get_key_size,
+	.get_iv_size = bf_get_iv_size,
+	.encrypt = bf_encrypt,
+	.decrypt = bf_decrypt,
+	.free = bf_free,
+	.mechanism.internal = BLOWFISH_CBC,
+	.keylen = 56,
+	.is_nss = false
+};
+
+/*
+ * Lookup table for finding the implementation based on a name. CAST5 as well
+ * as BLOWFISH are defined as cipher mechanisms in NSS but error out with
+ * SEC_ERROR_INVALID_ALGORITHM. Blowfish is implemented using the internal
+ * implementation while CAST5 isn't supported at all at this time,
+ */
+static const nss_cipher_ref nss_cipher_lookup[] = {
+	{"des", &nss_des_cbc},
+	{"des-cbc", &nss_des_cbc},
+	{"des-ecb", &nss_des_ecb},
+	{"des3-cbc", &nss_des3_cbc},
+	{"3des", &nss_des3_cbc},
+	{"3des-cbc", &nss_des3_cbc},
+	{"des3-ecb", &nss_des3_ecb},
+	{"3des-ecb", &nss_des3_ecb},
+	{"aes", &nss_aes_cbc},
+	{"aes-cbc", &nss_aes_cbc},
+	{"aes-ecb", &nss_aes_ecb},
+	{"rijndael", &nss_aes_cbc},
+	{"rijndael-cbc", &nss_aes_cbc},
+	{"rijndael-ecb", &nss_aes_ecb},
+	{"blowfish", &nss_bf_cbc},
+	{"blowfish-cbc", &nss_bf_cbc},
+	{"blowfish-ecb", &nss_bf_ecb},
+	{"bf", &nss_bf_cbc},
+	{"bf-cbc", &nss_bf_cbc},
+	{"bf-ecb", &nss_bf_ecb},
+	{NULL}
+};
+
+/*
+ * px_find_cipher
+ *
+ * Search for the requested cipher and see if there is support for it, and if
+ * so return an allocated object containing the playbook for how to encrypt
+ * and decrypt using the cipher.
+ */
+int
+px_find_cipher(const char *alias, PX_Cipher **res)
+{
+	const nss_cipher_ref *cipher_ref;
+	PX_Cipher  *px_cipher;
+	NSSInitParameters params;
+	NSSInitContext *nss_context;
+	nss_cipher *cipher;
+	internal_cipher *int_cipher;
+
+	for (cipher_ref = nss_cipher_lookup; cipher_ref->name; cipher_ref++)
+	{
+		if (strcmp(cipher_ref->name, alias) == 0)
+			break;
+	}
+
+	if (!cipher_ref->name)
+		return PXE_NO_CIPHER;
+
+	/*
+	 * Fill in the PX_Cipher to pass back to PX describing the operations to
+	 * perform in order to use the cipher.
+	 */
+	px_cipher = palloc(sizeof(*px_cipher));
+	px_cipher->block_size = cipher_ref->impl->get_block_size;
+	px_cipher->key_size = cipher_ref->impl->get_key_size;
+	px_cipher->iv_size = cipher_ref->impl->get_iv_size;
+	px_cipher->free = cipher_ref->impl->free;
+	px_cipher->init = cipher_ref->impl->init;
+	px_cipher->encrypt = cipher_ref->impl->encrypt;
+	px_cipher->decrypt = cipher_ref->impl->decrypt;
+
+	/*
+	 * Set the private data, which is different for NSS and internal ciphers
+	 */
+	if (cipher_ref->impl->is_nss)
+	{
+		/*
+		 * Initialize our own NSS context without a database backing it. At
+		 * some point we might want to allow users to use stored keys in the
+		 * database rather than passing them via SELECT encrypt(), and then
+		 * this need to be changed to open a user specified database.
+		 */
+		memset(&params, 0, sizeof(params));
+		params.length = sizeof(params);
+		nss_context = NSS_InitContext("", "", "", "", &params,
+									  NSS_INIT_READONLY | NSS_INIT_NOCERTDB |
+									  NSS_INIT_NOMODDB | NSS_INIT_FORCEOPEN |
+									  NSS_INIT_NOROOTINIT | NSS_INIT_PK11RELOAD);
+
+		/* nss_cipher is the private state struct for the operation */
+		cipher = palloc(sizeof(*cipher));
+		cipher->context = nss_context;
+		cipher->impl = cipher_ref->impl;
+		cipher->crypt_context = NULL;
+
+		px_cipher->ptr = cipher;
+	}
+	else
+	{
+		int_cipher = palloc0(sizeof(*int_cipher));
+
+		int_cipher->impl = cipher_ref->impl;
+		px_cipher->ptr = int_cipher;
+	}
+
+	*res = px_cipher;
+	return 0;
+}
diff --git a/contrib/sslinfo/sslinfo.c b/contrib/sslinfo/sslinfo.c
index 30cae0bb98..3aadd90aa6 100644
--- a/contrib/sslinfo/sslinfo.c
+++ b/contrib/sslinfo/sslinfo.c
@@ -9,9 +9,11 @@
 
 #include "postgres.h"
 
+#ifdef USE_OPENSSL
 #include <openssl/x509.h>
 #include <openssl/x509v3.h>
 #include <openssl/asn1.h>
+#endif
 
 #include "access/htup_details.h"
 #include "funcapi.h"
@@ -21,6 +23,7 @@
 
 PG_MODULE_MAGIC;
 
+#ifdef USE_OPENSSL
 static Datum X509_NAME_field_to_text(X509_NAME *name, text *fieldName);
 static Datum ASN1_STRING_to_text(ASN1_STRING *str);
 
@@ -31,6 +34,7 @@ typedef struct
 {
 	TupleDesc	tupdesc;
 } SSLExtensionInfoContext;
+#endif
 
 /*
  * Indicates whether current session uses SSL
@@ -131,6 +135,7 @@ ssl_client_serial(PG_FUNCTION_ARGS)
 }
 
 
+#ifdef USE_OPENSSL
 /*
  * Converts OpenSSL ASN1_STRING structure into text
  *
@@ -282,7 +287,23 @@ ssl_issuer_field(PG_FUNCTION_ARGS)
 	else
 		return result;
 }
+#endif							/* USE_OPENSSL */
 
+#ifdef USE_NSS
+PG_FUNCTION_INFO_V1(ssl_client_dn_field);
+Datum
+ssl_client_dn_field(PG_FUNCTION_ARGS)
+{
+	PG_RETURN_NULL();
+}
+
+PG_FUNCTION_INFO_V1(ssl_issuer_field);
+Datum
+ssl_issuer_field(PG_FUNCTION_ARGS)
+{
+	PG_RETURN_NULL();
+}
+#endif							/* USE_NSS */
 
 /*
  * Returns current client certificate subject as one string
@@ -338,6 +359,7 @@ ssl_issuer_dn(PG_FUNCTION_ARGS)
 }
 
 
+#ifdef USE_OPENSSL
 /*
  * Returns information about available SSL extensions.
  *
@@ -471,3 +493,13 @@ ssl_extension_info(PG_FUNCTION_ARGS)
 	/* All done */
 	SRF_RETURN_DONE(funcctx);
 }
+#endif							/* USE_OPENSSL */
+
+#ifdef USE_NSS
+PG_FUNCTION_INFO_V1(ssl_extension_info);
+Datum
+ssl_extension_info(PG_FUNCTION_ARGS)
+{
+	PG_RETURN_NULL();
+}
+#endif							/* USE_NSS */
diff --git a/doc/src/sgml/pgcrypto.sgml b/doc/src/sgml/pgcrypto.sgml
index 8748c64e2d..f03e1f5fcf 100644
--- a/doc/src/sgml/pgcrypto.sgml
+++ b/doc/src/sgml/pgcrypto.sgml
@@ -45,8 +45,9 @@ digest(data bytea, type text) returns bytea
     <literal>sha224</literal>, <literal>sha256</literal>,
     <literal>sha384</literal> and <literal>sha512</literal>.
     If <filename>pgcrypto</filename> was built with
-    <productname>OpenSSL</productname>, more algorithms are available, as
-    detailed in <xref linkend="pgcrypto-with-without-openssl"/>.
+    <productname>OpenSSL</productname> or <productname>NSS</productname>,
+    more algorithms are available, as
+    detailed in <xref linkend="pgcrypto-with-without-openssl-nss"/>.
    </para>
 
    <para>
@@ -763,7 +764,7 @@ pgp_sym_encrypt(data, psw, 'compress-algo=1, cipher-algo=aes256')
     Which cipher algorithm to use.
    </para>
 <literallayout>
-Values: bf, aes128, aes192, aes256 (OpenSSL-only: <literal>3des</literal>, <literal>cast5</literal>)
+Values: bf, aes128, aes192, aes256 (OpenSSL-only: <literal>3des</literal>, <literal>cast5</literal>; NSS-only: <literal>3des</literal>)
 Default: aes128
 Applies to: pgp_sym_encrypt, pgp_pub_encrypt
 </literallayout>
@@ -1152,8 +1153,8 @@ gen_random_uuid() returns uuid
    <para>
     <filename>pgcrypto</filename> configures itself according to the findings of the
     main PostgreSQL <literal>configure</literal> script.  The options that
-    affect it are <literal>--with-zlib</literal> and
-    <literal>--with-openssl</literal>.
+    affect it are <literal>--with-zlib</literal>,
+    <literal>--with-openssl</literal> and <literal>--with-nss</literal>.
    </para>
 
    <para>
@@ -1168,14 +1169,16 @@ gen_random_uuid() returns uuid
     BIGNUM functions.
    </para>
 
-   <table id="pgcrypto-with-without-openssl">
-    <title>Summary of Functionality with and without OpenSSL</title>
-    <tgroup cols="3">
+   <table id="pgcrypto-with-without-openssl-nss">
+    <title>Summary of Functionality with and without external cryptographic
+      library</title>
+    <tgroup cols="4">
      <thead>
       <row>
        <entry>Functionality</entry>
        <entry>Built-in</entry>
        <entry>With OpenSSL</entry>
+       <entry>With NSS</entry>
       </row>
      </thead>
      <tbody>
@@ -1183,51 +1186,67 @@ gen_random_uuid() returns uuid
        <entry>MD5</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>SHA1</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>SHA224/256/384/512</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>Other digest algorithms</entry>
        <entry>no</entry>
        <entry>yes (Note 1)</entry>
+       <entry>yes (Note 1)</entry>
       </row>
       <row>
        <entry>Blowfish</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>AES</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>DES/3DES/CAST5</entry>
        <entry>no</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
+      </row>
+      <row>
+       <entry>CAST5</entry>
+       <entry>no</entry>
+       <entry>yes</entry>
+       <entry>no</entry>
       </row>
       <row>
        <entry>Raw encryption</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>PGP Symmetric encryption</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>PGP Public-Key encryption</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
      </tbody>
     </tgroup>
@@ -1240,7 +1259,8 @@ gen_random_uuid() returns uuid
    <orderedlist>
     <listitem>
      <para>
-      Any digest algorithm <productname>OpenSSL</productname> supports
+      Any digest algorithm <productname>OpenSSL</productname> and
+      <productname>NSS</productname> supports
       is automatically picked up.
       This is not possible with ciphers, which need to be supported
       explicitly.
diff --git a/doc/src/sgml/sslinfo.sgml b/doc/src/sgml/sslinfo.sgml
index 3213c039ca..d2270cbe7c 100644
--- a/doc/src/sgml/sslinfo.sgml
+++ b/doc/src/sgml/sslinfo.sgml
@@ -22,7 +22,8 @@
 
  <para>
   This extension won't build at all unless the installation was
-  configured with <literal>--with-openssl</literal>.
+  configured with SSL support, such as <literal>--with-openssl</literal>
+  or <literal>--with-nss</literal>.
  </para>
 
  <sect2>
@@ -208,6 +209,9 @@ emailAddress
      the X.500 and X.509 standards, so you cannot just assign arbitrary
      meaning to them.
     </para>
+    <para>
+     This function is only available when using <productname>OpenSSL</productname>.
+    </para>
     </listitem>
    </varlistentry>
 
@@ -223,6 +227,9 @@ emailAddress
      Same as <function>ssl_client_dn_field</function>, but for the certificate issuer
      rather than the certificate subject.
     </para>
+    <para>
+     This function is only available when using <productname>OpenSSL</productname>.
+    </para>
     </listitem>
    </varlistentry>
 
@@ -238,6 +245,9 @@ emailAddress
      Provide information about extensions of client certificate: extension name,
      extension value, and if it is a critical extension.
     </para>
+    <para>
+     This function is only available when using <productname>OpenSSL</productname>.
+    </para>
     </listitem>
    </varlistentry>
   </variablelist>
diff --git a/src/tools/msvc/Install.pm b/src/tools/msvc/Install.pm
index ea3af48777..afe72a7e97 100644
--- a/src/tools/msvc/Install.pm
+++ b/src/tools/msvc/Install.pm
@@ -438,7 +438,8 @@ sub CopyContribFiles
 		{
 			# These configuration-based exclusions must match vcregress.pl
 			next if ($d eq "uuid-ossp"  && !defined($config->{uuid}));
-			next if ($d eq "sslinfo"    && !defined($config->{openssl}));
+			next if ($d eq "sslinfo"    && !defined($config->{openssl})
+			  && !defined($config->{nss}));
 			next if ($d eq "xml2"       && !defined($config->{xml}));
 			next if ($d =~ /_plperl$/   && !defined($config->{perl}));
 			next if ($d =~ /_plpython$/ && !defined($config->{python}));
diff --git a/src/tools/msvc/Mkvcbuild.pm b/src/tools/msvc/Mkvcbuild.pm
index 29879b51af..379f861a56 100644
--- a/src/tools/msvc/Mkvcbuild.pm
+++ b/src/tools/msvc/Mkvcbuild.pm
@@ -442,9 +442,14 @@ sub mkvcbuild
 		push @contrib_excludes, 'xml2';
 	}
 
+	if (!$solution->{options}->{openssl} && !$solution->{options}->{nss})
+	{
+		push @contrib_excludes, 'sslinfo';
+	}
+
 	if (!$solution->{options}->{openssl})
 	{
-		push @contrib_excludes, 'sslinfo', 'ssl_passphrase_callback';
+		push @contrib_excludes, 'ssl_passphrase_callback';
 	}
 
 	if (!$solution->{options}->{uuid})
@@ -474,6 +479,11 @@ sub mkvcbuild
 		$pgcrypto->AddFiles('contrib/pgcrypto', 'openssl.c',
 			'pgp-mpi-openssl.c');
 	}
+	elsif ($solution->{options}->{nss})
+	{
+		$pgcrypto->AddFiles('contrib/pgcrypto', 'nss.c',
+			'pgp-mpi-internal.c', 'imath.c', 'blf.c');
+	}
 	else
 	{
 		$pgcrypto->AddFiles(
-- 
2.21.1 (Apple Git-122.3)

From 2e44ad4a7709e700b5e651f238dffb2a439fcd58 Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Wed, 28 Oct 2020 11:18:42 +0100
Subject: [PATCH v21 1/6] NSS Frontend, Backend and build infrastructure

TODO:
	* SCRAM channel binding is implemented but doesn't work
	* Frontend CRL configuration handling
	* Settle on a required version in autoconf
	* Move pg_nss.h to a .c file for both frontend and backend

Daniel Gustafsson, Andrew Dunstan, Jacob Champion
---
 configure                                     |  422 +++++-
 configure.ac                                  |   56 +-
 .../postgres_fdw/expected/postgres_fdw.out    |    2 +-
 src/Makefile.global.in                        |    2 +-
 src/backend/libpq/Makefile                    |    6 +-
 src/backend/libpq/auth.c                      |    7 +
 src/backend/libpq/be-secure-nss.c             | 1265 +++++++++++++++++
 src/backend/libpq/be-secure.c                 |    3 +
 src/backend/libpq/hba.c                       |    2 +-
 src/backend/utils/misc/guc.c                  |   20 +-
 src/common/Makefile                           |    2 +-
 src/include/common/pg_nss.h                   |  175 +++
 src/include/libpq/libpq-be.h                  |   15 +-
 src/include/libpq/libpq.h                     |    3 +
 src/include/pg_config.h.in                    |    3 +
 src/include/pg_config_manual.h                |    5 +-
 src/interfaces/libpq/Makefile                 |   13 +-
 src/interfaces/libpq/fe-connect.c             |    4 +
 src/interfaces/libpq/fe-secure-nss.c          | 1112 +++++++++++++++
 src/interfaces/libpq/fe-secure.c              |    5 +-
 src/interfaces/libpq/libpq-fe.h               |   13 +-
 src/interfaces/libpq/libpq-int.h              |   20 +-
 src/tools/msvc/Mkvcbuild.pm                   |   22 +-
 src/tools/msvc/Solution.pm                    |   20 +
 src/tools/msvc/config_default.pl              |    1 +
 25 files changed, 3122 insertions(+), 76 deletions(-)
 create mode 100644 src/backend/libpq/be-secure-nss.c
 create mode 100644 src/include/common/pg_nss.h
 create mode 100644 src/interfaces/libpq/fe-secure-nss.c

diff --git a/configure b/configure
index 8af4b99021..cc6088b545 100755
--- a/configure
+++ b/configure
@@ -653,6 +653,9 @@ LIBOBJS
 UUID_LIBS
 LDAP_LIBS_BE
 LDAP_LIBS_FE
+with_ssl
+NSPR_CONFIG
+NSS_CONFIG
 PTHREAD_CFLAGS
 PTHREAD_LIBS
 PTHREAD_CC
@@ -710,7 +713,6 @@ with_uuid
 with_readline
 with_systemd
 with_selinux
-with_openssl
 with_ldap
 with_krb_srvnam
 krb_srvtab
@@ -798,6 +800,7 @@ infodir
 docdir
 oldincludedir
 includedir
+runstatedir
 localstatedir
 sharedstatedir
 sysconfdir
@@ -855,7 +858,6 @@ with_pam
 with_bsd_auth
 with_ldap
 with_bonjour
-with_openssl
 with_selinux
 with_systemd
 with_readline
@@ -867,6 +869,8 @@ with_libxslt
 with_system_tzdata
 with_zlib
 with_gnu_ld
+with_ssl
+with_openssl
 enable_largefile
 '
       ac_precious_vars='build_alias
@@ -935,6 +939,7 @@ datadir='${datarootdir}'
 sysconfdir='${prefix}/etc'
 sharedstatedir='${prefix}/com'
 localstatedir='${prefix}/var'
+runstatedir='${localstatedir}/run'
 includedir='${prefix}/include'
 oldincludedir='/usr/include'
 docdir='${datarootdir}/doc/${PACKAGE_TARNAME}'
@@ -1187,6 +1192,15 @@ do
   | -silent | --silent | --silen | --sile | --sil)
     silent=yes ;;
 
+  -runstatedir | --runstatedir | --runstatedi | --runstated \
+  | --runstate | --runstat | --runsta | --runst | --runs \
+  | --run | --ru | --r)
+    ac_prev=runstatedir ;;
+  -runstatedir=* | --runstatedir=* | --runstatedi=* | --runstated=* \
+  | --runstate=* | --runstat=* | --runsta=* | --runst=* | --runs=* \
+  | --run=* | --ru=* | --r=*)
+    runstatedir=$ac_optarg ;;
+
   -sbindir | --sbindir | --sbindi | --sbind | --sbin | --sbi | --sb)
     ac_prev=sbindir ;;
   -sbindir=* | --sbindir=* | --sbindi=* | --sbind=* | --sbin=* \
@@ -1324,7 +1338,7 @@ fi
 for ac_var in	exec_prefix prefix bindir sbindir libexecdir datarootdir \
 		datadir sysconfdir sharedstatedir localstatedir includedir \
 		oldincludedir docdir infodir htmldir dvidir pdfdir psdir \
-		libdir localedir mandir
+		libdir localedir mandir runstatedir
 do
   eval ac_val=\$$ac_var
   # Remove trailing slashes.
@@ -1477,6 +1491,7 @@ Fine tuning of the installation directories:
   --sysconfdir=DIR        read-only single-machine data [PREFIX/etc]
   --sharedstatedir=DIR    modifiable architecture-independent data [PREFIX/com]
   --localstatedir=DIR     modifiable single-machine data [PREFIX/var]
+  --runstatedir=DIR       modifiable per-process data [LOCALSTATEDIR/run]
   --libdir=DIR            object code libraries [EPREFIX/lib]
   --includedir=DIR        C header files [PREFIX/include]
   --oldincludedir=DIR     C header files for non-gcc [/usr/include]
@@ -1557,7 +1572,6 @@ Optional Packages:
   --with-bsd-auth         build with BSD Authentication support
   --with-ldap             build with LDAP support
   --with-bonjour          build with Bonjour support
-  --with-openssl          build with OpenSSL support
   --with-selinux          build with SELinux support
   --with-systemd          build with systemd support
   --without-readline      do not use GNU Readline nor BSD Libedit for editing
@@ -1571,6 +1585,8 @@ Optional Packages:
                           use system time zone data in DIR
   --without-zlib          do not use Zlib
   --with-gnu-ld           assume the C compiler uses GNU ld [default=no]
+  --with-ssl=LIB          use LIB for SSL/TLS support (openssl, nss)
+  --with-openssl          obsolete spelling of --with-ssl=openssl
 
 Some influential environment variables:
   CC          C compiler command
@@ -8071,41 +8087,6 @@ fi
 $as_echo "$with_bonjour" >&6; }
 
 
-#
-# OpenSSL
-#
-{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether to build with OpenSSL support" >&5
-$as_echo_n "checking whether to build with OpenSSL support... " >&6; }
-
-
-
-# Check whether --with-openssl was given.
-if test "${with_openssl+set}" = set; then :
-  withval=$with_openssl;
-  case $withval in
-    yes)
-
-$as_echo "#define USE_OPENSSL 1" >>confdefs.h
-
-      ;;
-    no)
-      :
-      ;;
-    *)
-      as_fn_error $? "no argument expected for --with-openssl option" "$LINENO" 5
-      ;;
-  esac
-
-else
-  with_openssl=no
-
-fi
-
-
-{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $with_openssl" >&5
-$as_echo "$with_openssl" >&6; }
-
-
 #
 # SELinux
 #
@@ -12179,7 +12160,64 @@ fi
   fi
 fi
 
+#
+# SSL Library
+#
+# There are currently two supported SSL/TLS libraries, OpenSSL and NSS.
+#
+
+
+
+# Check whether --with-ssl was given.
+if test "${with_ssl+set}" = set; then :
+  withval=$with_ssl;
+  case $withval in
+    yes)
+      as_fn_error $? "argument required for --with-ssl option" "$LINENO" 5
+      ;;
+    no)
+      as_fn_error $? "argument required for --with-ssl option" "$LINENO" 5
+      ;;
+    *)
+
+      ;;
+  esac
+
+fi
+
+
+if test x"$with_ssl" = x"" ; then
+  with_ssl=no
+fi
+
+
+
+# Check whether --with-openssl was given.
+if test "${with_openssl+set}" = set; then :
+  withval=$with_openssl;
+  case $withval in
+    yes)
+      :
+      ;;
+    no)
+      :
+      ;;
+    *)
+      as_fn_error $? "no argument expected for --with-openssl option" "$LINENO" 5
+      ;;
+  esac
+
+else
+  with_openssl=no
+
+fi
+
+
 if test "$with_openssl" = yes ; then
+  with_ssl=openssl
+fi
+
+if test "$with_ssl" = openssl ; then
     # Minimum required OpenSSL version is 1.0.1
 
 $as_echo "#define OPENSSL_API_COMPAT 0x10001000L" >>confdefs.h
@@ -12440,8 +12478,280 @@ _ACEOF
 fi
 done
 
+
+$as_echo "#define USE_OPENSSL 1" >>confdefs.h
+
+elif test "$with_ssl" = nss ; then
+  # TODO: fallback in case nss-config/nspr-config aren't found.
+  if test -z "$NSS_CONFIG"; then
+  for ac_prog in nss-config
+do
+  # Extract the first word of "$ac_prog", so it can be a program name with args.
+set dummy $ac_prog; ac_word=$2
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
+$as_echo_n "checking for $ac_word... " >&6; }
+if ${ac_cv_path_NSS_CONFIG+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  case $NSS_CONFIG in
+  [\\/]* | ?:[\\/]*)
+  ac_cv_path_NSS_CONFIG="$NSS_CONFIG" # Let the user override the test with a path.
+  ;;
+  *)
+  as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH
+do
+  IFS=$as_save_IFS
+  test -z "$as_dir" && as_dir=.
+    for ac_exec_ext in '' $ac_executable_extensions; do
+  if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
+    ac_cv_path_NSS_CONFIG="$as_dir/$ac_word$ac_exec_ext"
+    $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
+    break 2
+  fi
+done
+  done
+IFS=$as_save_IFS
+
+  ;;
+esac
+fi
+NSS_CONFIG=$ac_cv_path_NSS_CONFIG
+if test -n "$NSS_CONFIG"; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $NSS_CONFIG" >&5
+$as_echo "$NSS_CONFIG" >&6; }
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+fi
+
+
+  test -n "$NSS_CONFIG" && break
+done
+
+else
+  # Report the value of NSS_CONFIG in configure's output in all cases.
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for NSS_CONFIG" >&5
+$as_echo_n "checking for NSS_CONFIG... " >&6; }
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $NSS_CONFIG" >&5
+$as_echo "$NSS_CONFIG" >&6; }
+fi
+
+  if test -z "$NSPR_CONFIG"; then
+  for ac_prog in nspr-config
+do
+  # Extract the first word of "$ac_prog", so it can be a program name with args.
+set dummy $ac_prog; ac_word=$2
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
+$as_echo_n "checking for $ac_word... " >&6; }
+if ${ac_cv_path_NSPR_CONFIG+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  case $NSPR_CONFIG in
+  [\\/]* | ?:[\\/]*)
+  ac_cv_path_NSPR_CONFIG="$NSPR_CONFIG" # Let the user override the test with a path.
+  ;;
+  *)
+  as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH
+do
+  IFS=$as_save_IFS
+  test -z "$as_dir" && as_dir=.
+    for ac_exec_ext in '' $ac_executable_extensions; do
+  if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
+    ac_cv_path_NSPR_CONFIG="$as_dir/$ac_word$ac_exec_ext"
+    $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
+    break 2
+  fi
+done
+  done
+IFS=$as_save_IFS
+
+  ;;
+esac
+fi
+NSPR_CONFIG=$ac_cv_path_NSPR_CONFIG
+if test -n "$NSPR_CONFIG"; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $NSPR_CONFIG" >&5
+$as_echo "$NSPR_CONFIG" >&6; }
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+fi
+
+
+  test -n "$NSPR_CONFIG" && break
+done
+
+else
+  # Report the value of NSPR_CONFIG in configure's output in all cases.
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for NSPR_CONFIG" >&5
+$as_echo_n "checking for NSPR_CONFIG... " >&6; }
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $NSPR_CONFIG" >&5
+$as_echo "$NSPR_CONFIG" >&6; }
+fi
+
+  if test -n "$NSS_CONFIG"; then
+    NSS_LIBS=`$NSS_CONFIG --libs`
+	NSS_CFLAGS=`$NSS_CONFIG --cflags`
+  fi
+  if test -n "$NSPR_CONFIG"; then
+	NSPR_LIBS=`$NSPR_CONFIG --libs`
+	NSPR_CFLAGS=`$NSPR_CONFIG --cflags`
+  fi
+
+  LDFLAGS="$LDFLAGS $NSS_LIBS $NSPR_LIBS"
+  CFLAGS="$CFLAGS $NSS_CFLAGS $NSPR_CFLAGS"
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for NSS_InitContext in -lnss3" >&5
+$as_echo_n "checking for NSS_InitContext in -lnss3... " >&6; }
+if ${ac_cv_lib_nss3_NSS_InitContext+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lnss3  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char NSS_InitContext ();
+int
+main ()
+{
+return NSS_InitContext ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_lib_nss3_NSS_InitContext=yes
+else
+  ac_cv_lib_nss3_NSS_InitContext=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_nss3_NSS_InitContext" >&5
+$as_echo "$ac_cv_lib_nss3_NSS_InitContext" >&6; }
+if test "x$ac_cv_lib_nss3_NSS_InitContext" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_LIBNSS3 1
+_ACEOF
+
+  LIBS="-lnss3 $LIBS"
+
+else
+  as_fn_error $? "library 'nss3' is required for NSS" "$LINENO" 5
 fi
 
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for PR_GetDefaultIOMethods in -lnspr4" >&5
+$as_echo_n "checking for PR_GetDefaultIOMethods in -lnspr4... " >&6; }
+if ${ac_cv_lib_nspr4_PR_GetDefaultIOMethods+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lnspr4  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char PR_GetDefaultIOMethods ();
+int
+main ()
+{
+return PR_GetDefaultIOMethods ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_lib_nspr4_PR_GetDefaultIOMethods=yes
+else
+  ac_cv_lib_nspr4_PR_GetDefaultIOMethods=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_nspr4_PR_GetDefaultIOMethods" >&5
+$as_echo "$ac_cv_lib_nspr4_PR_GetDefaultIOMethods" >&6; }
+if test "x$ac_cv_lib_nspr4_PR_GetDefaultIOMethods" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_LIBNSPR4 1
+_ACEOF
+
+  LIBS="-lnspr4 $LIBS"
+
+else
+  as_fn_error $? "library 'nspr4' is required for NSS" "$LINENO" 5
+fi
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for SSL_GetImplementedCiphers in -lssl3" >&5
+$as_echo_n "checking for SSL_GetImplementedCiphers in -lssl3... " >&6; }
+if ${ac_cv_lib_ssl3_SSL_GetImplementedCiphers+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lssl3  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char SSL_GetImplementedCiphers ();
+int
+main ()
+{
+return SSL_GetImplementedCiphers ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_lib_ssl3_SSL_GetImplementedCiphers=yes
+else
+  ac_cv_lib_ssl3_SSL_GetImplementedCiphers=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_ssl3_SSL_GetImplementedCiphers" >&5
+$as_echo "$ac_cv_lib_ssl3_SSL_GetImplementedCiphers" >&6; }
+if test "x$ac_cv_lib_ssl3_SSL_GetImplementedCiphers" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_LIBSSL3 1
+_ACEOF
+
+  LIBS="-lssl3 $LIBS"
+
+else
+  as_fn_error $? "library 'ssl3' is required for NSS" "$LINENO" 5
+fi
+
+
+$as_echo "#define USE_NSS 1" >>confdefs.h
+
+elif test "$with_ssl" != no ; then
+  as_fn_error $? "--with-ssl must specify one of openssl or nss" "$LINENO" 5
+fi
+
+
 if test "$with_pam" = yes ; then
   { $as_echo "$as_me:${as_lineno-$LINENO}: checking for pam_start in -lpam" >&5
 $as_echo_n "checking for pam_start in -lpam... " >&6; }
@@ -13327,7 +13637,7 @@ done
 
 fi
 
-if test "$with_openssl" = yes ; then
+if test "$with_ssl" = openssl ; then
   ac_fn_c_check_header_mongrel "$LINENO" "openssl/ssl.h" "ac_cv_header_openssl_ssl_h" "$ac_includes_default"
 if test "x$ac_cv_header_openssl_ssl_h" = xyes; then :
 
@@ -13344,6 +13654,25 @@ else
 fi
 
 
+fi
+
+if test "$with_ssl" = nss ; then
+  ac_fn_c_check_header_mongrel "$LINENO" "nss/ssl.h" "ac_cv_header_nss_ssl_h" "$ac_includes_default"
+if test "x$ac_cv_header_nss_ssl_h" = xyes; then :
+
+else
+  as_fn_error $? "header file <nss/ssl.h> is required for NSS" "$LINENO" 5
+fi
+
+
+  ac_fn_c_check_header_mongrel "$LINENO" "nss/nss.h" "ac_cv_header_nss_nss_h" "$ac_includes_default"
+if test "x$ac_cv_header_nss_nss_h" = xyes; then :
+
+else
+  as_fn_error $? "header file <nss/nss.h> is required for NSS" "$LINENO" 5
+fi
+
+
 fi
 
 if test "$with_pam" = yes ; then
@@ -14689,7 +15018,7 @@ else
     We can't simply define LARGE_OFF_T to be 9223372036854775807,
     since some C++ compilers masquerading as C compilers
     incorrectly reject 9223372036854775807.  */
-#define LARGE_OFF_T (((off_t) 1 << 62) - 1 + ((off_t) 1 << 62))
+#define LARGE_OFF_T ((((off_t) 1 << 31) << 31) - 1 + (((off_t) 1 << 31) << 31))
   int off_t_is_large[(LARGE_OFF_T % 2147483629 == 721
 		       && LARGE_OFF_T % 2147483647 == 1)
 		      ? 1 : -1];
@@ -14735,7 +15064,7 @@ else
     We can't simply define LARGE_OFF_T to be 9223372036854775807,
     since some C++ compilers masquerading as C compilers
     incorrectly reject 9223372036854775807.  */
-#define LARGE_OFF_T (((off_t) 1 << 62) - 1 + ((off_t) 1 << 62))
+#define LARGE_OFF_T ((((off_t) 1 << 31) << 31) - 1 + (((off_t) 1 << 31) << 31))
   int off_t_is_large[(LARGE_OFF_T % 2147483629 == 721
 		       && LARGE_OFF_T % 2147483647 == 1)
 		      ? 1 : -1];
@@ -14759,7 +15088,7 @@ rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
     We can't simply define LARGE_OFF_T to be 9223372036854775807,
     since some C++ compilers masquerading as C compilers
     incorrectly reject 9223372036854775807.  */
-#define LARGE_OFF_T (((off_t) 1 << 62) - 1 + ((off_t) 1 << 62))
+#define LARGE_OFF_T ((((off_t) 1 << 31) << 31) - 1 + (((off_t) 1 << 31) << 31))
   int off_t_is_large[(LARGE_OFF_T % 2147483629 == 721
 		       && LARGE_OFF_T % 2147483647 == 1)
 		      ? 1 : -1];
@@ -14804,7 +15133,7 @@ else
     We can't simply define LARGE_OFF_T to be 9223372036854775807,
     since some C++ compilers masquerading as C compilers
     incorrectly reject 9223372036854775807.  */
-#define LARGE_OFF_T (((off_t) 1 << 62) - 1 + ((off_t) 1 << 62))
+#define LARGE_OFF_T ((((off_t) 1 << 31) << 31) - 1 + (((off_t) 1 << 31) << 31))
   int off_t_is_large[(LARGE_OFF_T % 2147483629 == 721
 		       && LARGE_OFF_T % 2147483647 == 1)
 		      ? 1 : -1];
@@ -14828,7 +15157,7 @@ rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
     We can't simply define LARGE_OFF_T to be 9223372036854775807,
     since some C++ compilers masquerading as C compilers
     incorrectly reject 9223372036854775807.  */
-#define LARGE_OFF_T (((off_t) 1 << 62) - 1 + ((off_t) 1 << 62))
+#define LARGE_OFF_T ((((off_t) 1 << 31) << 31) - 1 + (((off_t) 1 << 31) << 31))
   int off_t_is_large[(LARGE_OFF_T % 2147483629 == 721
 		       && LARGE_OFF_T % 2147483647 == 1)
 		      ? 1 : -1];
@@ -18106,6 +18435,9 @@ $as_echo_n "checking which random number source to use... " >&6; }
 if test x"$with_openssl" = x"yes" ; then
   { $as_echo "$as_me:${as_lineno-$LINENO}: result: OpenSSL" >&5
 $as_echo "OpenSSL" >&6; }
+elif test x"$with_nss" = x"yes" ; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: NSS" >&5
+$as_echo "NSS" >&6; }
 elif test x"$PORTNAME" = x"win32" ; then
   { $as_echo "$as_me:${as_lineno-$LINENO}: result: Windows native" >&5
 $as_echo "Windows native" >&6; }
diff --git a/configure.ac b/configure.ac
index 868a94c9ba..0da8cc9b0b 100644
--- a/configure.ac
+++ b/configure.ac
@@ -852,15 +852,6 @@ PGAC_ARG_BOOL(with, bonjour, no,
 AC_MSG_RESULT([$with_bonjour])
 
 
-#
-# OpenSSL
-#
-AC_MSG_CHECKING([whether to build with OpenSSL support])
-PGAC_ARG_BOOL(with, openssl, no, [build with OpenSSL support],
-              [AC_DEFINE([USE_OPENSSL], 1, [Define to build with OpenSSL support. (--with-openssl)])])
-AC_MSG_RESULT([$with_openssl])
-AC_SUBST(with_openssl)
-
 #
 # SELinux
 #
@@ -1209,7 +1200,21 @@ if test "$with_gssapi" = yes ; then
   fi
 fi
 
+#
+# SSL Library
+#
+# There are currently two supported SSL/TLS libraries, OpenSSL and NSS.
+#
+PGAC_ARG_REQ(with, ssl, [LIB], [use LIB for SSL/TLS support (openssl, nss)])
+if test x"$with_ssl" = x"" ; then
+  with_ssl=no
+fi
+PGAC_ARG_BOOL(with, openssl, no, [obsolete spelling of --with-ssl=openssl])
 if test "$with_openssl" = yes ; then
+  with_ssl=openssl
+fi
+
+if test "$with_ssl" = openssl ; then
   dnl Order matters!
   # Minimum required OpenSSL version is 1.0.1
   AC_DEFINE(OPENSSL_API_COMPAT, [0x10001000L],
@@ -1233,7 +1238,31 @@ if test "$with_openssl" = yes ; then
   # thread-safety. In 1.1.0, it's no longer required, and CRYPTO_lock()
   # function was removed.
   AC_CHECK_FUNCS([CRYPTO_lock])
+  AC_DEFINE([USE_OPENSSL], 1, [Define to 1 if you have OpenSSL support.])
+elif test "$with_ssl" = nss ; then
+  # TODO: fallback in case nss-config/nspr-config aren't found.
+  PGAC_PATH_PROGS(NSS_CONFIG, nss-config)
+  PGAC_PATH_PROGS(NSPR_CONFIG, nspr-config)
+  if test -n "$NSS_CONFIG"; then
+    NSS_LIBS=`$NSS_CONFIG --libs`
+	NSS_CFLAGS=`$NSS_CONFIG --cflags`
+  fi
+  if test -n "$NSPR_CONFIG"; then
+	NSPR_LIBS=`$NSPR_CONFIG --libs`
+	NSPR_CFLAGS=`$NSPR_CONFIG --cflags`
+  fi
+
+  LDFLAGS="$LDFLAGS $NSS_LIBS $NSPR_LIBS"
+  CFLAGS="$CFLAGS $NSS_CFLAGS $NSPR_CFLAGS"
+
+  AC_CHECK_LIB(nss3, NSS_InitContext, [], [AC_MSG_ERROR([library 'nss3' is required for NSS])])
+  AC_CHECK_LIB(nspr4, PR_GetDefaultIOMethods, [], [AC_MSG_ERROR([library 'nspr4' is required for NSS])])
+  AC_CHECK_LIB(ssl3, SSL_GetImplementedCiphers, [], [AC_MSG_ERROR([library 'ssl3' is required for NSS])])
+  AC_DEFINE([USE_NSS], 1, [Define to 1 if you have NSS support,])
+elif test "$with_ssl" != no ; then
+  AC_MSG_ERROR([--with-ssl must specify one of openssl or nss])
 fi
+AC_SUBST(with_ssl)
 
 if test "$with_pam" = yes ; then
   AC_CHECK_LIB(pam,    pam_start, [], [AC_MSG_ERROR([library 'pam' is required for PAM])])
@@ -1406,11 +1435,16 @@ if test "$with_gssapi" = yes ; then
 	[AC_CHECK_HEADERS(gssapi.h, [], [AC_MSG_ERROR([gssapi.h header file is required for GSSAPI])])])
 fi
 
-if test "$with_openssl" = yes ; then
+if test "$with_ssl" = openssl ; then
   AC_CHECK_HEADER(openssl/ssl.h, [], [AC_MSG_ERROR([header file <openssl/ssl.h> is required for OpenSSL])])
   AC_CHECK_HEADER(openssl/err.h, [], [AC_MSG_ERROR([header file <openssl/err.h> is required for OpenSSL])])
 fi
 
+if test "$with_ssl" = nss ; then
+  AC_CHECK_HEADER(nss/ssl.h, [], [AC_MSG_ERROR([header file <nss/ssl.h> is required for NSS])])
+  AC_CHECK_HEADER(nss/nss.h, [], [AC_MSG_ERROR([header file <nss/nss.h> is required for NSS])])
+fi
+
 if test "$with_pam" = yes ; then
   AC_CHECK_HEADERS(security/pam_appl.h, [],
                    [AC_CHECK_HEADERS(pam/pam_appl.h, [],
@@ -2165,6 +2199,8 @@ fi
 AC_MSG_CHECKING([which random number source to use])
 if test x"$with_openssl" = x"yes" ; then
   AC_MSG_RESULT([OpenSSL])
+elif test x"$with_nss" = x"yes" ; then
+  AC_MSG_RESULT([NSS])
 elif test x"$PORTNAME" = x"win32" ; then
   AC_MSG_RESULT([Windows native])
 else
diff --git a/contrib/postgres_fdw/expected/postgres_fdw.out b/contrib/postgres_fdw/expected/postgres_fdw.out
index 1cad311436..1b0c5ce1fa 100644
--- a/contrib/postgres_fdw/expected/postgres_fdw.out
+++ b/contrib/postgres_fdw/expected/postgres_fdw.out
@@ -8923,7 +8923,7 @@ DO $d$
     END;
 $d$;
 ERROR:  invalid option "password"
-HINT:  Valid options in this context are: service, passfile, channel_binding, connect_timeout, dbname, host, hostaddr, port, options, application_name, keepalives, keepalives_idle, keepalives_interval, keepalives_count, tcp_user_timeout, sslmode, sslcompression, sslcert, sslkey, sslrootcert, sslcrl, requirepeer, ssl_min_protocol_version, ssl_max_protocol_version, gssencmode, krbsrvname, gsslib, target_session_attrs, use_remote_estimate, fdw_startup_cost, fdw_tuple_cost, extensions, updatable, fetch_size
+HINT:  Valid options in this context are: service, passfile, channel_binding, connect_timeout, dbname, host, hostaddr, port, options, application_name, keepalives, keepalives_idle, keepalives_interval, keepalives_count, tcp_user_timeout, sslmode, sslcompression, sslcert, sslkey, sslrootcert, sslcrl, requirepeer, ssl_min_protocol_version, ssl_max_protocol_version, gssencmode, krbsrvname, gsslib, target_session_attrs, cert_database, use_remote_estimate, fdw_startup_cost, fdw_tuple_cost, extensions, updatable, fetch_size
 CONTEXT:  SQL statement "ALTER SERVER loopback_nopw OPTIONS (ADD password 'dummypw')"
 PL/pgSQL function inline_code_block line 3 at EXECUTE
 -- If we add a password for our user mapping instead, we should get a different
diff --git a/src/Makefile.global.in b/src/Makefile.global.in
index 7ca1e9aac5..bdab2a6825 100644
--- a/src/Makefile.global.in
+++ b/src/Makefile.global.in
@@ -183,7 +183,7 @@ with_icu	= @with_icu@
 with_perl	= @with_perl@
 with_python	= @with_python@
 with_tcl	= @with_tcl@
-with_openssl	= @with_openssl@
+with_ssl	= @with_ssl@
 with_readline	= @with_readline@
 with_selinux	= @with_selinux@
 with_systemd	= @with_systemd@
diff --git a/src/backend/libpq/Makefile b/src/backend/libpq/Makefile
index efc5ef760a..045d2c2f6b 100644
--- a/src/backend/libpq/Makefile
+++ b/src/backend/libpq/Makefile
@@ -28,8 +28,12 @@ OBJS = \
 	pqmq.o \
 	pqsignal.o
 
-ifeq ($(with_openssl),yes)
+ifeq ($(with_ssl),openssl)
 OBJS += be-secure-openssl.o
+else
+ifeq ($(with_ssl),nss)
+OBJS += be-secure-nss.o
+endif
 endif
 
 ifeq ($(with_gssapi),yes)
diff --git a/src/backend/libpq/auth.c b/src/backend/libpq/auth.c
index 545635f41a..09ad2ad063 100644
--- a/src/backend/libpq/auth.c
+++ b/src/backend/libpq/auth.c
@@ -2849,7 +2849,14 @@ CheckCertAuth(Port *port)
 {
 	int			status_check_usermap = STATUS_ERROR;
 
+#if defined(USE_OPENSSL)
 	Assert(port->ssl);
+#elif defined(USE_NSS)
+	/* TODO: should we rename pr_fd to ssl, to keep consistency? */
+	Assert(port->pr_fd);
+#else
+	Assert(false);
+#endif
 
 	/* Make sure we have received a username in the certificate */
 	if (port->peer_cn == NULL ||
diff --git a/src/backend/libpq/be-secure-nss.c b/src/backend/libpq/be-secure-nss.c
new file mode 100644
index 0000000000..111b46dea8
--- /dev/null
+++ b/src/backend/libpq/be-secure-nss.c
@@ -0,0 +1,1265 @@
+/*-------------------------------------------------------------------------
+ *
+ * be-secure-nss.c
+ *	  functions for supporting NSS as a TLS backend
+ *
+ *
+ * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ *	  src/backend/libpq/be-secure-nss.c
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#include "postgres.h"
+
+#include <sys/stat.h>
+
+/*
+ * BITS_PER_BYTE is also defined in the NSPR header files, so we need to undef
+ * our version to avoid compiler warnings on redefinition.
+ */
+#define pg_BITS_PER_BYTE BITS_PER_BYTE
+#undef BITS_PER_BYTE
+
+/*
+ * The nspr/obsolete/protypes.h NSPR header typedefs uint64 and int64 with
+ * colliding definitions from ours, causing a much expected compiler error.
+ * Remove backwards compatibility with ancient NSPR versions to avoid this.
+ */
+#define NO_NSPR_10_SUPPORT
+#include <nspr/nspr.h>
+#include <nspr/prerror.h>
+#include <nspr/prio.h>
+#include <nspr/prmem.h>
+#include <nspr/prtypes.h>
+
+#include <nss/nss.h>
+#include <nss/base64.h>
+#include <nss/cert.h>
+#include <nss/certdb.h>
+#include <nss/hasht.h>
+#include <nss/keyhi.h>
+#include <nss/pk11pub.h>
+#include <nss/secder.h>
+#include <nss/secerr.h>
+#include <nss/secitem.h>
+#include <nss/secoidt.h>
+#include <nss/secport.h>
+#include <nss/ssl.h>
+#include <nss/sslerr.h>
+#include <nss/sslproto.h>
+
+/*
+ * Ensure that the colliding definitions match, else throw an error. In case
+ * NSPR has removed the definition for some reason, make sure to put ours
+ * back again.
+ */
+#if defined(BITS_PER_BYTE)
+#if BITS_PER_BYTE != pg_BITS_PER_BYTE
+#error "incompatible byte widths between NSPR and postgres"
+#endif
+#else
+#define BITS_PER_BYTE pg_BITS_PER_BYTE
+#endif
+#undef pg_BITS_PER_BYTE
+
+#include "common/pg_nss.h"
+#include "lib/stringinfo.h"
+#include "libpq/libpq.h"
+#include "nodes/pg_list.h"
+#include "miscadmin.h"
+#include "storage/fd.h"
+#include "utils/guc.h"
+#include "utils/memutils.h"
+
+
+/* default init hook can be overridden by a shared library */
+static void default_nss_tls_init(bool isServerStart);
+nss_tls_init_hook_type nss_tls_init_hook = default_nss_tls_init;
+
+static PRDescIdentity pr_id;
+
+static PRIOMethods pr_iomethods;
+static NSSInitContext * nss_context = NULL;
+static SSLVersionRange desired_sslver;
+
+static char *external_ssl_passphrase_cb(PK11SlotInfo *slot, PRBool retry, void *arg);
+static bool dummy_ssl_passwd_cb_called = false;
+static bool ssl_is_server_start;
+
+/*
+ * PR_ImportTCPSocket() is a private API, but very widely used, as it's the
+ * only way to make NSS use an already set up POSIX file descriptor rather
+ * than opening one itself. To quote the NSS documentation:
+ *
+ *		"In theory, code that uses PR_ImportTCPSocket may break when NSPR's
+ *		implementation changes. In practice, this is unlikely to happen because
+ *		NSPR's implementation has been stable for years and because of NSPR's
+ *		strong commitment to backward compatibility."
+ *
+ * https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSPR/Reference/PR_ImportTCPSocket
+ *
+ * The function is declared in <private/pprio.h>, but as it is a header marked
+ * private we declare it here rather than including it.
+ */
+NSPR_API(PRFileDesc *) PR_ImportTCPSocket(int);
+
+/* NSS IO layer callback overrides */
+static PRInt32 pg_ssl_read(PRFileDesc * fd, void *buf, PRInt32 amount,
+						   PRIntn flags, PRIntervalTime timeout);
+static PRInt32 pg_ssl_write(PRFileDesc * fd, const void *buf, PRInt32 amount,
+							PRIntn flags, PRIntervalTime timeout);
+static PRStatus pg_ssl_close(PRFileDesc * fd);
+/* Utility functions */
+static PRFileDesc * init_iolayer(Port *port);
+static uint16 ssl_protocol_version_to_nss(int v, const char *guc_name);
+
+static char *pg_SSLerrmessage(PRErrorCode errcode);
+static char *ssl_protocol_version_to_string(int v);
+static SECStatus pg_cert_auth_handler(void *arg, PRFileDesc * fd,
+									  PRBool checksig, PRBool isServer);
+static SECStatus pg_bad_cert_handler(void *arg, PRFileDesc * fd);
+static char *dummy_ssl_passphrase_cb(PK11SlotInfo * slot, PRBool retry, void *arg);
+
+/* ------------------------------------------------------------ */
+/*						 Public interface						*/
+/* ------------------------------------------------------------ */
+
+/*
+ * be_tls_init
+ *			Initialize the nss TLS library in the postmaster
+ *
+ * The majority of the setup needs to happen in be_tls_open_server since the
+ * NSPR initialization must happen after the forking of the backend. We could
+ * potentially move some parts in under !isServerStart, but so far this is the
+ * separation chosen.
+ */
+int
+be_tls_init(bool isServerStart)
+{
+	SECStatus	status;
+	SSLVersionRange supported_sslver;
+
+	status = SSL_ConfigServerSessionIDCacheWithOpt(0, 0, NULL, 1, 0, 0, PR_FALSE);
+	if (status != SECSuccess)
+	{
+		ereport(isServerStart ? FATAL : LOG,
+				(errmsg("unable to connect to TLS connection cache: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+		return -1;
+	}
+
+	if (!ssl_database || strlen(ssl_database) == 0)
+	{
+		ereport(isServerStart ? FATAL : LOG,
+				(errmsg("no certificate database specified")));
+		return -1;
+	}
+
+	/*
+	 * We check for the desired TLS version range here, even though we cannot
+	 * set it until be_open_server such that we can be compatible with how the
+	 * OpenSSL backend reports errors for incompatible range configurations.
+	 * Set either the default supported TLS version range, or the configured
+	 * range from ssl_min_protocol_version and ssl_max_protocol version. In
+	 * case the user hasn't defined the maximum allowed version we fall back
+	 * to the highest version TLS that the library supports.
+	 */
+	if (SSL_VersionRangeGetSupported(ssl_variant_stream, &supported_sslver) != SECSuccess)
+	{
+		ereport(isServerStart ? FATAL : LOG,
+				(errmsg("unable to get default protocol support from NSS")));
+		return -1;
+	}
+
+	/*
+	 * Set the fallback versions for the TLS protocol version range to a
+	 * combination of our minimal requirement and the library maximum. Error
+	 * messages should be kept identical to those in be-secure-openssl.c to
+	 * make translations easier.
+	 */
+	desired_sslver.min = SSL_LIBRARY_VERSION_TLS_1_0;
+	desired_sslver.max = supported_sslver.max;
+
+	if (ssl_min_protocol_version)
+	{
+		int			ver = ssl_protocol_version_to_nss(ssl_min_protocol_version,
+													  "ssl_min_protocol_version");
+
+		if (ver == -1)
+		{
+			ereport(isServerStart ? FATAL : LOG,
+					(errmsg("\"%s\" setting \"%s\" not supported by this build",
+							"ssl_min_protocol_version",
+							GetConfigOption("ssl_min_protocol_version",
+											false, false))));
+			return -1;
+		}
+
+		if (ver > 0)
+			desired_sslver.min = ver;
+	}
+
+	if (ssl_max_protocol_version)
+	{
+		int			ver = ssl_protocol_version_to_nss(ssl_max_protocol_version,
+													  "ssl_max_protocol_version");
+
+		if (ver == -1)
+		{
+			ereport(isServerStart ? FATAL : LOG,
+					(errmsg("\"%s\" setting \"%s\" not supported by this build",
+							"ssl_max_protocol_version",
+							GetConfigOption("ssl_max_protocol_version",
+											false, false))));
+			return -1;
+		}
+		if (ver > 0)
+			desired_sslver.max = ver;
+
+		if (ver < desired_sslver.min)
+		{
+			ereport(isServerStart ? FATAL : LOG,
+					(errmsg("could not set SSL protocol version range"),
+					 errdetail("\"%s\" cannot be higher than \"%s\"",
+							   "ssl_min_protocol_version",
+							   "ssl_max_protocol_version")));
+			return -1;
+		}
+	}
+
+	/*
+	 * Set the passphrase callback which will be used both to obtain the
+	 * passphrase from the user, as well as by NSS to obtain the phrase
+	 * repeatedly.
+	 */
+	ssl_is_server_start = isServerStart;
+	(*nss_tls_init_hook) (isServerStart);
+
+	return 0;
+}
+
+int
+be_tls_open_server(Port *port)
+{
+	SECStatus	status;
+	PRFileDesc *model;
+	PRFileDesc *pr_fd;
+	PRFileDesc *layer;
+	CERTCertificate *server_cert;
+	SECKEYPrivateKey *private_key;
+	CERTSignedCrl *crl;
+	SECItem		crlname;
+	char	   *cert_database;
+	NSSInitParameters params;
+
+	/*
+	 * The NSPR documentation states that runtime initialization via PR_Init
+	 * is no longer required, as the first caller into NSPR will perform the
+	 * initialization implicitly. The documentation doesn't however clarify
+	 * from which version this is holds true, so let's perform the potentially
+	 * superfluous initialization anyways to avoid crashing on older versions
+	 * of NSPR, as there is no difference in overhead.  The NSS documentation
+	 * still states that PR_Init must be called in some way (implicitly or
+	 * explicitly).
+	 *
+	 * The below parameters are what the implicit initialization would've done
+	 * for us, and should work even for older versions where it might not be
+	 * done automatically. The last parameter, maxPTDs, is set to various
+	 * values in other codebases, but has been unused since NSPR 2.1 which was
+	 * released sometime in 1998. In current versions of NSPR all parameters
+	 * are ignored.
+	 */
+	PR_Init(PR_USER_THREAD, PR_PRIORITY_NORMAL, 0 /* maxPTDs */ );
+
+	/*
+	 * The certificate path (configdir) must contain a valid NSS database. If
+	 * the certificate path isn't a valid directory, NSS will fall back on the
+	 * system certificate database. If the certificate path is a directory but
+	 * is empty then the initialization will fail. On the client side this can
+	 * be allowed for any sslmode but the verify-xxx ones.
+	 * https://bugzilla.redhat.com/show_bug.cgi?id=728562 For the server side
+	 * we won't allow this to fail however, as we require the certificate and
+	 * key to exist.
+	 *
+	 * The original design of NSS was for a single application to use a single
+	 * copy of it, initialized with NSS_Initialize() which isn't returning any
+	 * handle with which to refer to NSS. NSS initialization and shutdown are
+	 * global for the application, so a shutdown in another NSS enabled
+	 * library would cause NSS to be stopped for libpq as well.  The fix has
+	 * been to introduce NSS_InitContext which returns a context handle to
+	 * pass to NSS_ShutdownContext.  NSS_InitContext was introduced in NSS
+	 * 3.12, but the use of it is not very well documented.
+	 * https://bugzilla.redhat.com/show_bug.cgi?id=738456
+	 *
+	 * The InitParameters struct passed can be used to override internal
+	 * values in NSS, but the usage is not documented at all. When using
+	 * NSS_Init initializations, the values are instead set via PK11_Configure
+	 * calls so the PK11_Configure documentation can be used to glean some
+	 * details on these.
+	 *
+	 * https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS/PKCS11/Module_Specs
+	 */
+	memset(&params, '\0', sizeof(params));
+	params.length = sizeof(params);
+
+	if (!ssl_database || strlen(ssl_database) == 0)
+		ereport(FATAL,
+				(errmsg("no certificate database specified")));
+
+	cert_database = psprintf("sql:%s", ssl_database);
+	nss_context = NSS_InitContext(cert_database, "", "", "",
+								  &params,
+								  NSS_INIT_READONLY | NSS_INIT_PK11RELOAD);
+	pfree(cert_database);
+
+	if (!nss_context)
+		ereport(FATAL,
+				(errmsg("unable to read certificate database \"%s\": %s",
+						ssl_database, pg_SSLerrmessage(PR_GetError()))));
+
+	/*
+	 * Import the already opened socket as we don't want to use NSPR functions
+	 * for opening the network socket due to how the PostgreSQL protocol works
+	 * with TLS connections. This function is not part of the NSPR public API,
+	 * see the comment at the top of the file for the rationale of still using
+	 * it.
+	 */
+	pr_fd = PR_ImportTCPSocket(port->sock);
+	if (!pr_fd)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to connect to socket")));
+		return -1;
+	}
+
+	/*
+	 * Most of the documentation available, and implementations of, NSS/NSPR
+	 * use the PR_NewTCPSocket() function here, which has the drawback that it
+	 * can only create IPv4 sockets. Instead use PR_OpenTCPSocket() which
+	 * copes with IPv6 as well.
+	 *
+	 * We use a model filedescriptor here which is a construct in NSPR/NSS in
+	 * order to create a configuration template for sockets which can then be
+	 * applied to new sockets created. This makes more sense in a server which
+	 * accepts multiple connections and want to perform the boilerplate just
+	 * once, but it does provide a nice abstraction here as well in that we
+	 * can error out early without having performed any operation on the real
+	 * socket.
+	 */
+	model = PR_OpenTCPSocket(port->laddr.addr.ss_family);
+	if (!model)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to open socket")));
+		return -1;
+	}
+
+	/*
+	 * Convert the NSPR socket to an SSL socket. Ensuring the success of this
+	 * operation is critical as NSS SSL_* functions may return SECSuccess on
+	 * the socket even though SSL hasn't been enabled, which introduce a risk
+	 * of silent downgrades.
+	 */
+	model = SSL_ImportFD(NULL, model);
+	if (!model)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to enable TLS on socket")));
+		return -1;
+	}
+
+	/*
+	 * Configure basic settings for the connection over the SSL socket in
+	 * order to set it up as a server.
+	 */
+	if (SSL_OptionSet(model, SSL_SECURITY, PR_TRUE) != SECSuccess)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to configure TLS connection")));
+		return -1;
+	}
+
+	if (SSL_OptionSet(model, SSL_HANDSHAKE_AS_SERVER, PR_TRUE) != SECSuccess ||
+		SSL_OptionSet(model, SSL_HANDSHAKE_AS_CLIENT, PR_FALSE) != SECSuccess)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to configure TLS connection as server")));
+		return -1;
+	}
+
+	/*
+	 * SSLv2 is disabled by default, and SSLv3 will be excluded from the range
+	 * of allowed protocols further down. Since we really don't want these to
+	 * ever be enabled, let's use belts and suspenders and explicitly turn
+	 * them off as well.
+	 */
+	SSL_OptionSet(model, SSL_ENABLE_SSL2, PR_FALSE);
+	SSL_OptionSet(model, SSL_ENABLE_SSL3, PR_FALSE);
+
+#ifdef SSL_CBC_RANDOM_IV
+
+	/*
+	 * Enable protection against the BEAST attack in case the NSS server has
+	 * support for that. While SSLv3 is disabled, we may still allow TLSv1
+	 * which is affected. The option isn't documented as an SSL option, but as
+	 * an NSS environment variable.
+	 */
+	SSL_OptionSet(model, SSL_CBC_RANDOM_IV, PR_TRUE);
+#endif
+
+	/*
+	 * Configure the allowed ciphers. If there are no user preferred suites,
+	 * set the domestic policy.
+	 *
+	 * Historically there were different cipher policies based on export (and
+	 * import) restrictions: Domestic, Export and France. These are since long
+	 * removed with all ciphers being enabled by default. Due to backwards
+	 * compatibility, the old API is still used even though all three policies
+	 * now do the same thing.
+	 *
+	 * If SSLCipherSuites define a policy of the user, we set that rather than
+	 * enabling all ciphers via NSS_SetDomesticPolicy.
+	 *
+	 * TODO: while this code works, the set of ciphers which can be set and
+	 * still end up with a working socket is woefully underdocumented for
+	 * anything more recent than SSLv3 (the code for TLS actually calls ssl3
+	 * functions under the hood for SSL_CipherPrefSet), so it's unclear if
+	 * this is helpful or not. Using the policies works, but may be too
+	 * coarsely grained.
+	 *
+	 * Another TODO: The SSL_ImplementedCiphers table returned with calling
+	 * SSL_GetImplementedCiphers is sorted in server preference order. Sorting
+	 * SSLCipherSuites according to the order of the ciphers therein could be
+	 * a way to implement ssl_prefer_server_ciphers - if we at all want to use
+	 * cipher selection for NSS like how we do it for OpenSSL that is.
+	 */
+
+	/*
+	 * If no ciphers are specified, enable them all.
+	 */
+	if (!SSLCipherSuites || strlen(SSLCipherSuites) == 0)
+	{
+		status = NSS_SetDomesticPolicy();
+		if (status != SECSuccess)
+		{
+			ereport(COMMERROR,
+					(errmsg("unable to set cipher policy: %s",
+							pg_SSLerrmessage(PR_GetError()))));
+			return -1;
+		}
+	}
+	else
+	{
+		char	   *ciphers,
+				   *c;
+
+		char	   *sep = ":;, ";
+		PRUint16	ciphercode;
+		const		PRUint16 *nss_ciphers;
+
+		/*
+		 * If the user has specified a set of preferred cipher suites we start
+		 * by turning off all the existing suites to avoid the risk of down-
+		 * grades to a weaker cipher than expected.
+		 */
+		nss_ciphers = SSL_GetImplementedCiphers();
+		for (int i = 0; i < SSL_GetNumImplementedCiphers(); i++)
+			SSL_CipherPrefSet(model, nss_ciphers[i], PR_FALSE);
+
+		ciphers = pstrdup(SSLCipherSuites);
+
+		for (c = strtok(ciphers, sep); c; c = strtok(NULL, sep))
+		{
+			ciphercode = pg_find_cipher(c);
+			if (ciphercode != INVALID_CIPHER)
+			{
+				status = SSL_CipherPrefSet(model, ciphercode, PR_TRUE);
+				if (status != SECSuccess)
+				{
+					ereport(COMMERROR,
+							(errmsg("invalid cipher-suite specified: %s", c)));
+					return -1;
+				}
+			}
+		}
+
+		pfree(ciphers);
+	}
+
+	if (SSL_VersionRangeSet(model, &desired_sslver) != SECSuccess)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to set requested SSL protocol version range")));
+		return -1;
+	}
+
+	/*
+	 * Set up the custom IO layer.
+	 */
+	layer = init_iolayer(port);
+	if (!layer)
+		return -1;
+
+	if (PR_PushIOLayer(pr_fd, PR_TOP_IO_LAYER, layer) != PR_SUCCESS)
+	{
+		PR_Close(layer);
+		ereport(COMMERROR,
+				(errmsg("unable to push IO layer")));
+		return -1;
+	}
+
+	server_cert = PK11_FindCertFromNickname(ssl_cert_file, (void *) port);
+	if (!server_cert)
+	{
+		if (dummy_ssl_passwd_cb_called)
+		{
+			ereport(COMMERROR,
+					(errmsg("unable to load certificate for \"%s\": %s",
+							ssl_cert_file, pg_SSLerrmessage(PR_GetError())),
+					 errhint("The certificate requires a password.")));
+			return -1;
+		}
+		else
+		{
+			ereport(COMMERROR,
+					(errmsg("unable to find certificate for \"%s\": %s",
+							ssl_cert_file, pg_SSLerrmessage(PR_GetError()))));
+			return -1;
+		}
+	}
+
+	private_key = PK11_FindKeyByAnyCert(server_cert, (void *) port);
+	if (!private_key)
+	{
+		if (dummy_ssl_passwd_cb_called)
+		{
+			ereport(COMMERROR,
+					(errmsg("unable to load private key for \"%s\": %s",
+							ssl_cert_file, pg_SSLerrmessage(PR_GetError())),
+					 errhint("The private key requires a password.")));
+			return -1;
+		}
+		else
+		{
+			ereport(COMMERROR,
+					(errmsg("unable to find private key for \"%s\": %s",
+							ssl_cert_file, pg_SSLerrmessage(PR_GetError()))));
+			return -1;
+		}
+	}
+
+	/*
+	 * NSS doesn't use CRL files on disk, so we use the ssl_crl_file guc to
+	 * contain the CRL nickname for the current server certificate in the NSS
+	 * certificate database. The main difference from the OpenSSL backend is
+	 * that NSS will use the CRL regardless, but being able to make sure the
+	 * CRL is loaded seems like a good feature.
+	 */
+	if (ssl_crl_file[0])
+	{
+		SECITEM_CopyItem(NULL, &crlname, &server_cert->derSubject);
+		crl = SEC_FindCrlByName(CERT_GetDefaultCertDB(), &crlname, SEC_CRL_TYPE);
+		if (!crl)
+		{
+			ereport(COMMERROR,
+					(errmsg("specified CRL not found in database")));
+			return -1;
+		}
+		SEC_DestroyCrl(crl);
+	}
+
+	/*
+	 * Finally we must configure the socket for being a server by setting the
+	 * certificate and key. The NULL parameter is an SSLExtraServerCertData
+	 * pointer with the final parameter being the size of the extra server
+	 * cert data structure pointed to. This is typically only used for
+	 * credential delegation.
+	 */
+	status = SSL_ConfigServerCert(model, server_cert, private_key, NULL, 0);
+	if (status != SECSuccess)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to configure server for TLS server connections: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+		return -1;
+	}
+
+	ssl_loaded_verify_locations = true;
+
+	/*
+	 * At this point, we no longer have use for the certificate and private
+	 * key as they have been copied into the context by NSS. Destroy our
+	 * copies explicitly to clean out the memory as best we can.
+	 */
+	CERT_DestroyCertificate(server_cert);
+	SECKEY_DestroyPrivateKey(private_key);
+
+	status = SSL_AuthCertificateHook(model, pg_cert_auth_handler, (void *) port);
+	if (status != SECSuccess)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to install authcert hook: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+		return -1;
+	}
+	SSL_BadCertHook(model, pg_bad_cert_handler, (void *) port);
+	SSL_OptionSet(model, SSL_REQUEST_CERTIFICATE, PR_TRUE);
+	SSL_OptionSet(model, SSL_REQUIRE_CERTIFICATE, PR_FALSE);
+
+	port->pr_fd = SSL_ImportFD(model, pr_fd);
+	if (!port->pr_fd)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to initialize")));
+		return -1;
+	}
+
+	PR_Close(model);
+
+	/*
+	 * Force a handshake on the next I/O request, the second parameter means
+	 * that we are a server, PR_FALSE would indicate being a client. NSPR
+	 * requires us to call SSL_ResetHandshake since we imported an already
+	 * established socket.
+	 */
+	status = SSL_ResetHandshake(port->pr_fd, PR_TRUE);
+	if (status != SECSuccess)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to initiate handshake: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+		return -1;
+	}
+	status = SSL_ForceHandshake(port->pr_fd);
+	if (status != SECSuccess)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to handshake: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+		return -1;
+	}
+
+	port->ssl_in_use = true;
+	return 0;
+}
+
+ssize_t
+be_tls_read(Port *port, void *ptr, size_t len, int *waitfor)
+{
+	ssize_t		n_read;
+	PRErrorCode err;
+
+	n_read = PR_Read(port->pr_fd, ptr, len);
+
+	if (n_read < 0)
+	{
+		err = PR_GetError();
+
+		if (err == PR_WOULD_BLOCK_ERROR)
+		{
+			*waitfor = WL_SOCKET_READABLE;
+			errno = EWOULDBLOCK;
+		}
+		else
+			errno = ECONNRESET;
+	}
+
+	return n_read;
+}
+
+ssize_t
+be_tls_write(Port *port, void *ptr, size_t len, int *waitfor)
+{
+	ssize_t		n_write;
+	PRErrorCode err;
+	PRIntn		flags = 0;
+
+	/*
+	 * The flags parameter to PR_Send is no longer used and is, according to
+	 * the documentation, required to be zero.
+	 */
+	n_write = PR_Send(port->pr_fd, ptr, len, flags, PR_INTERVAL_NO_WAIT);
+
+	if (n_write < 0)
+	{
+		err = PR_GetError();
+
+		if (err == PR_WOULD_BLOCK_ERROR)
+		{
+			*waitfor = WL_SOCKET_WRITEABLE;
+			errno = EWOULDBLOCK;
+		}
+		else
+			errno = ECONNRESET;
+	}
+
+	return n_write;
+}
+
+void
+be_tls_close(Port *port)
+{
+	if (!port)
+		return;
+
+	if (port->peer_cn)
+	{
+		SSL_InvalidateSession(port->pr_fd);
+		pfree(port->peer_cn);
+		port->peer_cn = NULL;
+	}
+
+	PR_Close(port->pr_fd);
+	port->pr_fd = NULL;
+	port->ssl_in_use = false;
+
+	if (nss_context)
+	{
+		NSS_ShutdownContext(nss_context);
+		nss_context = NULL;
+	}
+}
+
+void
+be_tls_destroy(void)
+{
+	/*
+	 * It reads a bit odd to clear a session cache when we are destroying the
+	 * context altogether, but if the session cache isn't cleared before
+	 * shutting down the context it will fail with SEC_ERROR_BUSY.
+	 */
+	SSL_ClearSessionCache();
+}
+
+int
+be_tls_get_cipher_bits(Port *port)
+{
+	SECStatus	status;
+	SSLChannelInfo channel;
+	SSLCipherSuiteInfo suite;
+
+	status = SSL_GetChannelInfo(port->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+		goto error;
+
+	status = SSL_GetCipherSuiteInfo(channel.cipherSuite, &suite, sizeof(suite));
+	if (status != SECSuccess)
+		goto error;
+
+	return suite.effectiveKeyBits;
+
+error:
+	ereport(WARNING,
+			(errmsg("unable to extract TLS session information: %s",
+					pg_SSLerrmessage(PR_GetError()))));
+	return 0;
+}
+
+/*
+ * be_tls_get_compression
+ *
+ * NSS disabled support for TLS compression in version 3.33 and removed the
+ * code in a subsequent release. The API for retrieving information about
+ * compression as well as enabling it is kept for backwards compatibility, but
+ * we don't need to consult it since it was only available for SSLv3 which we
+ * don't support.
+ *
+ * https://bugzilla.mozilla.org/show_bug.cgi?id=1409587
+ */
+bool
+be_tls_get_compression(Port *port)
+{
+	return false;
+}
+
+/*
+ * be_tls_get_version
+ *
+ * Returns the protocol version used for the current connection, or NULL in
+ * case of errors.
+ */
+const char *
+be_tls_get_version(Port *port)
+{
+	SECStatus	status;
+	SSLChannelInfo channel;
+
+	status = SSL_GetChannelInfo(port->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+	{
+		ereport(WARNING,
+				(errmsg("unable to extract TLS session information: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+		return NULL;
+	}
+
+	return ssl_protocol_version_to_string(channel.protocolVersion);
+}
+
+const char *
+be_tls_get_cipher(Port *port)
+{
+	SECStatus	status;
+	SSLChannelInfo channel;
+	SSLCipherSuiteInfo suite;
+
+	status = SSL_GetChannelInfo(port->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+		goto error;
+
+	status = SSL_GetCipherSuiteInfo(channel.cipherSuite, &suite, sizeof(suite));
+	if (status != SECSuccess)
+		goto error;
+
+	return suite.cipherSuiteName;
+
+error:
+	ereport(WARNING,
+			(errmsg("unable to extract TLS session information: %s",
+					pg_SSLerrmessage(PR_GetError()))));
+	return NULL;
+}
+
+void
+be_tls_get_peer_subject_name(Port *port, char *ptr, size_t len)
+{
+	CERTCertificate *certificate;
+
+	certificate = SSL_PeerCertificate(port->pr_fd);
+	if (certificate)
+		strlcpy(ptr, CERT_NameToAscii(&certificate->subject), len);
+	else
+		ptr[0] = '\0';
+}
+
+void
+be_tls_get_peer_issuer_name(Port *port, char *ptr, size_t len)
+{
+	CERTCertificate *certificate;
+
+	certificate = SSL_PeerCertificate(port->pr_fd);
+	if (certificate)
+		strlcpy(ptr, CERT_NameToAscii(&certificate->issuer), len);
+	else
+		ptr[0] = '\0';
+}
+
+void
+be_tls_get_peer_serial(Port *port, char *ptr, size_t len)
+{
+	CERTCertificate *certificate;
+
+	certificate = SSL_PeerCertificate(port->pr_fd);
+	if (certificate)
+		snprintf(ptr, len, "%li", DER_GetInteger(&(certificate->serialNumber)));
+	else
+		ptr[0] = '\0';
+}
+
+char *
+be_tls_get_certificate_hash(Port *port, size_t *len)
+{
+	CERTCertificate *certificate;
+	SECOidTag	signature_alg;
+	SECOidTag	digest_alg;
+	int			digest_len;
+	const NSSSignatureAlgorithms *candidate;
+	SECStatus	status;
+	PLArenaPool *arena = NULL;
+	SECItem		digest;
+	char	   *ret;
+
+	*len = 0;
+	certificate = SSL_LocalCertificate(port->pr_fd);
+	if (!certificate)
+		return NULL;
+
+	signature_alg = SECOID_GetAlgorithmTag(&certificate->signature);
+
+	candidate = NSS_SCRAMDigestAlgorithm;
+	while (candidate->signature)
+	{
+		if (signature_alg == candidate->signature)
+		{
+			digest_alg = candidate->hash;
+			digest_len = candidate->len;
+			break;
+		}
+
+		candidate++;
+	}
+
+	if (!candidate->signature)
+		elog(ERROR, "could not find digest for OID '%s'",
+			 SECOID_FindOIDTagDescription(signature_alg));
+
+	arena = PORT_NewArena(SEC_ASN1_DEFAULT_ARENA_SIZE);
+	digest.data = PORT_ArenaZAlloc(arena, sizeof(unsigned char) * digest_len);
+	digest.len = digest_len;
+
+	status = PK11_HashBuf(digest_alg, digest.data,
+						  certificate->derCert.data,
+						  certificate->derCert.len);
+
+	if (status != SECSuccess)
+	{
+		PORT_FreeArena(arena, PR_TRUE);
+		return NULL;
+	}
+
+	ret = palloc(digest.len);
+	memcpy(ret, digest.data, digest.len);
+	*len = digest_len;
+	PORT_FreeArena(arena, PR_TRUE);
+
+	return ret;
+}
+
+/* ------------------------------------------------------------ */
+/*						Internal functions						*/
+/* ------------------------------------------------------------ */
+
+/*
+ * default_nss_tls_init
+ *
+ * The default TLS init hook function which users can override for installing
+ * their own passphrase callbacks and similar actions. In case no callback has
+ * been configured, or the callback isn't reload capable during a server
+ * reload, the dummy callback will be installed.
+ *
+ * The private data for the callback is set differently depending on how it's
+ * invoked. For calls which may invoke the callback deeper in the callstack
+ * the private data is set with SSL_SetPKCS11PinArg. When the call is directly
+ * invoking the callback, like PK11_FindCertFromNickname, then the private
+ * data is passed as a parameter. Setting the data with SSL_SetPKCS11PinArg is
+ * thus not required but good practice.
+ *
+ * NSS doesn't provide a default callback like OpenSSL does, but a callback is
+ * required to be set.  The password callback can be installed at any time, but
+ * setting the private data with SSL_SetPKCS11PinArg requires a PR Filedesc.
+ */
+static void
+default_nss_tls_init(bool isServerStart)
+{
+	/*
+	 * No user-defined callback has been configured, install the dummy call-
+	 * back since we must set something.
+	 */
+	if (!ssl_passphrase_command[0])
+		PK11_SetPasswordFunc(dummy_ssl_passphrase_cb);
+	else
+	{
+		/*
+		 * There is a user-defined callback, set it unless we are in a restart
+		 * and cannot handle restarts due to an interactive callback.
+		 */
+		if (isServerStart)
+			PK11_SetPasswordFunc(external_ssl_passphrase_cb);
+		else
+		{
+			if (ssl_passphrase_command_supports_reload)
+				PK11_SetPasswordFunc(external_ssl_passphrase_cb);
+			else
+				PK11_SetPasswordFunc(dummy_ssl_passphrase_cb);
+		}
+	}
+}
+
+/*
+ * external_ssl_passphrase_cb
+ *
+ * Runs the callback configured by ssl_passphrase_command and returns the
+ * captured password back to NSS.
+ */
+static char *
+external_ssl_passphrase_cb(PK11SlotInfo *slot, PRBool retry, void *arg)
+{
+	/*
+	 * NSS use a hardcoded 256 byte buffer for reading the password so set the
+	 * same limit for our callback buffer.
+	 */
+	char		buf[256];
+	int			len;
+	char	   *password = NULL;
+	char	   *prompt;
+
+	/*
+	 * Since there is no password callback in NSS when the server starts up,
+	 * it makes little sense to create an interactive callback. Thus, if this
+	 * is a retry attempt then give up immediately.
+	 */
+	if (retry)
+		return NULL;
+
+	/*
+	 * Construct the same prompt that NSS uses internally even though it is
+	 * unlikely to serve much purpose, but we must set a prompt so we might as
+	 * well do it right.
+	 */
+	prompt = psprintf("Enter Password or Pin for \"%s\":",
+					  PK11_GetTokenName(slot));
+
+	len = run_ssl_passphrase_command(prompt, ssl_is_server_start, buf, sizeof(buf));
+	pfree(prompt);
+
+	if (!len)
+		return NULL;
+
+	/*
+	 * At least one byte with password content was returned, and NSS requires
+	 * that we return it allocated in NSS controlled memory. If we fail to
+	 * allocate then abort without passing back NULL and bubble up the error
+	 * on the PG side.
+	 */
+	password = (char *) PR_Malloc(len + 1);
+	if (!password)
+	{
+		explicit_bzero(buf, sizeof(buf));
+		ereport(ERROR,
+				(errcode(ERRCODE_OUT_OF_MEMORY),
+				 errmsg("out of memory")));
+	}
+	strlcpy(password, buf, sizeof(password));
+	explicit_bzero(buf, sizeof(buf));
+
+	return password;
+}
+
+/*
+ * dummy_ssl_passphrase_cb
+ *
+ * Return unsuccessful if we are asked to provide the passphrase for a cert or
+ * key, without having a passphrase callback installed.
+ */
+static char *
+dummy_ssl_passphrase_cb(PK11SlotInfo *slot, PRBool retry, void *arg)
+{
+	dummy_ssl_passwd_cb_called = true;
+	return NULL;
+}
+
+static SECStatus
+pg_bad_cert_handler(void *arg, PRFileDesc * fd)
+{
+	Port	   *port = (Port *) arg;
+
+	port->peer_cert_valid = false;
+	return SECFailure;
+}
+
+static SECStatus
+pg_cert_auth_handler(void *arg, PRFileDesc * fd, PRBool checksig, PRBool isServer)
+{
+	SECStatus	status;
+	Port	   *port = (Port *) arg;
+	CERTCertificate *cert;
+	char	   *peer_cn;
+	int			len;
+
+	status = SSL_AuthCertificate(CERT_GetDefaultCertDB(), port->pr_fd, checksig, PR_TRUE);
+	if (status == SECSuccess)
+	{
+		cert = SSL_PeerCertificate(port->pr_fd);
+		len = strlen(cert->subjectName);
+		peer_cn = MemoryContextAllocZero(TopMemoryContext, len + 1);
+
+		/*
+		 * Skip over the key= portion of the key=value containing the peer CN.
+		 */
+		if (strncmp(cert->subjectName, "CN=", 3) == 0)
+			strlcpy(peer_cn, cert->subjectName + strlen("CN="), len + 1);
+		else
+			strlcpy(peer_cn, cert->subjectName, len + 1);
+		CERT_DestroyCertificate(cert);
+
+		port->peer_cn = peer_cn;
+		port->peer_cert_valid = true;
+	}
+
+	return status;
+}
+
+static PRInt32
+pg_ssl_read(PRFileDesc *fd, void *buf, PRInt32 amount, PRIntn flags,
+			PRIntervalTime timeout)
+{
+	PRRecvFN	read_fn;
+	PRInt32		n_read;
+
+	read_fn = fd->lower->methods->recv;
+	n_read = read_fn(fd->lower, buf, amount, flags, timeout);
+
+	return n_read;
+}
+
+static PRInt32
+pg_ssl_write(PRFileDesc *fd, const void *buf, PRInt32 amount, PRIntn flags,
+			 PRIntervalTime timeout)
+{
+	PRSendFN	send_fn;
+	PRInt32		n_write;
+
+	send_fn = fd->lower->methods->send;
+	n_write = send_fn(fd->lower, buf, amount, flags, timeout);
+
+	return n_write;
+}
+
+static PRStatus
+pg_ssl_close(PRFileDesc *fd)
+{
+	/*
+	 * Disconnect our private Port from the fd before closing out the stack.
+	 * (Debug builds of NSPR will assert if we do not.)
+	 */
+	fd->secret = NULL;
+	return PR_GetDefaultIOMethods()->close(fd);
+}
+
+static PRFileDesc *
+init_iolayer(Port *port)
+{
+	const		PRIOMethods *default_methods;
+	PRFileDesc *layer;
+
+	/*
+	 * Start by initializing our layer with all the default methods so that we
+	 * can selectively override the ones we want while still ensuring that we
+	 * have a complete layer specification.
+	 */
+	default_methods = PR_GetDefaultIOMethods();
+	memcpy(&pr_iomethods, default_methods, sizeof(PRIOMethods));
+
+	pr_iomethods.recv = pg_ssl_read;
+	pr_iomethods.send = pg_ssl_write;
+	pr_iomethods.close = pg_ssl_close;
+
+	/*
+	 * Each IO layer must be identified by a unique name, where uniqueness is
+	 * per connection. Each connection in a postgres cluster can generate the
+	 * identity from the same string as they will create their IO layers on
+	 * different sockets. Only one layer per socket can have the same name.
+	 */
+	pr_id = PR_GetUniqueIdentity("PostgreSQL Server");
+	if (pr_id == PR_INVALID_IO_LAYER)
+	{
+		ereport(ERROR,
+				(errmsg("out of memory when setting up TLS connection")));
+		return NULL;
+	}
+
+	/*
+	 * Create the actual IO layer as a stub such that it can be pushed onto
+	 * the layer stack. The step via a stub is required as we define custom
+	 * callbacks.
+	 */
+	layer = PR_CreateIOLayerStub(pr_id, &pr_iomethods);
+	if (!layer)
+	{
+		ereport(ERROR,
+				(errmsg("unable to create NSS I/O layer")));
+		return NULL;
+	}
+
+	/* Store the Port as private data available in callbacks */
+	layer->secret = (void *) port;
+
+	return layer;
+}
+
+static char *
+ssl_protocol_version_to_string(int v)
+{
+	switch (v)
+	{
+			/* SSL v2 and v3 are not supported */
+		case SSL_LIBRARY_VERSION_2:
+		case SSL_LIBRARY_VERSION_3_0:
+			Assert(false);
+			break;
+
+		case SSL_LIBRARY_VERSION_TLS_1_0:
+			return pstrdup("TLSv1.0");
+		case SSL_LIBRARY_VERSION_TLS_1_1:
+			return pstrdup("TLSv1.1");
+		case SSL_LIBRARY_VERSION_TLS_1_2:
+			return pstrdup("TLSv1.2");
+		case SSL_LIBRARY_VERSION_TLS_1_3:
+			return pstrdup("TLSv1.3");
+	}
+
+	return pstrdup("unknown");
+}
+
+
+/*
+ * ssl_protocol_version_to_nss
+ *			Translate PostgreSQL TLS version to NSS version
+ *
+ * Returns zero in case the requested TLS version is undefined (PG_ANY) and
+ * should be set by the caller, or -1 on failure.
+ */
+static uint16
+ssl_protocol_version_to_nss(int v, const char *guc_name)
+{
+	switch (v)
+	{
+			/*
+			 * There is no SSL_LIBRARY_ macro defined in NSS with the value
+			 * zero, so we use this to signal the caller that the highest
+			 * useful version should be set on the connection.
+			 */
+		case PG_TLS_ANY:
+			return 0;
+
+			/*
+			 * No guard is required here as there are no versions of NSS
+			 * without support for TLS1.
+			 */
+		case PG_TLS1_VERSION:
+			return SSL_LIBRARY_VERSION_TLS_1_0;
+		case PG_TLS1_1_VERSION:
+#ifdef SSL_LIBRARY_VERSION_TLS_1_1
+			return SSL_LIBRARY_VERSION_TLS_1_1;
+#else
+			break;
+#endif
+		case PG_TLS1_2_VERSION:
+#ifdef SSL_LIBRARY_VERSION_TLS_1_2
+			return SSL_LIBRARY_VERSION_TLS_1_2;
+#else
+			break;
+#endif
+		case PG_TLS1_3_VERSION:
+#ifdef SSL_LIBRARY_VERSION_TLS_1_3
+			return SSL_LIBRARY_VERSION_TLS_1_3;
+#else
+			break;
+#endif
+		default:
+			break;
+	}
+
+	return -1;
+}
+
+/*
+ * pg_SSLerrmessage
+ *		Create and return a human readable error message given
+ *		the specified error code
+ *
+ * PR_ErrorToName only converts the enum identifier of the error to string,
+ * but that can be quite useful for debugging (and in case PR_ErrorToString is
+ * unable to render a message then we at least have something).
+ */
+static char *
+pg_SSLerrmessage(PRErrorCode errcode)
+{
+	return psprintf("%s (%s)",
+					PR_ErrorToString(errcode, PR_LANGUAGE_I_DEFAULT),
+					PR_ErrorToName(errcode));
+}
diff --git a/src/backend/libpq/be-secure.c b/src/backend/libpq/be-secure.c
index 4cf139a223..5e0c27c134 100644
--- a/src/backend/libpq/be-secure.c
+++ b/src/backend/libpq/be-secure.c
@@ -49,6 +49,9 @@ bool		ssl_passphrase_command_supports_reload;
 #ifdef USE_SSL
 bool		ssl_loaded_verify_locations = false;
 #endif
+#ifdef USE_NSS
+char	   *ssl_database;
+#endif
 
 /* GUC variable controlling SSL cipher list */
 char	   *SSLCipherSuites = NULL;
diff --git a/src/backend/libpq/hba.c b/src/backend/libpq/hba.c
index 371dccb852..12b105bbd1 100644
--- a/src/backend/libpq/hba.c
+++ b/src/backend/libpq/hba.c
@@ -1041,7 +1041,7 @@ parse_hba_line(TokenizedLine *tok_line, int elevel)
 			ereport(elevel,
 					(errcode(ERRCODE_CONFIG_FILE_ERROR),
 					 errmsg("hostssl record cannot match because SSL is not supported by this build"),
-					 errhint("Compile with --with-openssl to use SSL connections."),
+					 errhint("Compile with --with-openssl or --with-nss to use SSL connections."),
 					 errcontext("line %d of configuration file \"%s\"",
 								line_num, HbaFileName)));
 			*err_msg = "hostssl record cannot match because SSL is not supported by this build";
diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c
index 17579eeaca..0095a9980e 100644
--- a/src/backend/utils/misc/guc.c
+++ b/src/backend/utils/misc/guc.c
@@ -4308,7 +4308,11 @@ static struct config_string ConfigureNamesString[] =
 		},
 		&ssl_library,
 #ifdef USE_SSL
+#if defined(USE_OPENSSL)
 		"OpenSSL",
+#elif defined(USE_NSS)
+		"NSS",
+#endif
 #else
 		"",
 #endif
@@ -4366,6 +4370,18 @@ static struct config_string ConfigureNamesString[] =
 		check_canonical_path, assign_pgstat_temp_directory, NULL
 	},
 
+#ifdef USE_NSS
+	{
+		{"ssl_database", PGC_SIGHUP, CONN_AUTH_SSL,
+			gettext_noop("Location of the NSS certificate database."),
+			NULL
+		},
+		&ssl_database,
+		"",
+		NULL, NULL, NULL
+	},
+#endif
+
 	{
 		{"synchronous_standby_names", PGC_SIGHUP, REPLICATION_PRIMARY,
 			gettext_noop("Number of synchronous standbys and list of names of potential synchronous ones."),
@@ -4394,8 +4410,10 @@ static struct config_string ConfigureNamesString[] =
 			GUC_SUPERUSER_ONLY
 		},
 		&SSLCipherSuites,
-#ifdef USE_OPENSSL
+#if defined(USE_OPENSSL)
 		"HIGH:MEDIUM:+3DES:!aNULL",
+#elif defined (USE_NSS)
+		"",
 #else
 		"none",
 #endif
diff --git a/src/common/Makefile b/src/common/Makefile
index 93eb27a2aa..7a4b3dad5d 100644
--- a/src/common/Makefile
+++ b/src/common/Makefile
@@ -80,7 +80,7 @@ OBJS_COMMON = \
 	wait_error.o \
 	wchar.o
 
-ifeq ($(with_openssl),yes)
+ifeq ($(with_ssl),openssl)
 OBJS_COMMON += \
 	protocol_openssl.o \
 	cryptohash_openssl.o
diff --git a/src/include/common/pg_nss.h b/src/include/common/pg_nss.h
new file mode 100644
index 0000000000..008fee85f1
--- /dev/null
+++ b/src/include/common/pg_nss.h
@@ -0,0 +1,175 @@
+/*-------------------------------------------------------------------------
+ *
+ * pg_nss.h
+ *	  Support for NSS as a TLS backend
+ *
+ * These definitions are used by both frontend and backend code.
+ *
+ * Copyright (c) 2020, PostgreSQL Global Development Group
+ *
+ * IDENTIFICATION
+ *        src/include/common/pg_nss.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef PG_NSS_H
+#define PG_NSS_H
+
+#ifdef USE_NSS
+#define NO_NSPR_10_SUPPORT
+#include <nss/hasht.h>
+#include <nss/secoidt.h>
+#include <nss/sslproto.h>
+
+PRUint16	pg_find_cipher(char *name);
+
+typedef struct
+{
+	SECOidTag	signature;
+	SECOidTag	hash;
+	int			len;
+}			NSSSignatureAlgorithms;
+
+typedef struct
+{
+	const char *name;
+	PRUint16	number;
+}			NSSCiphers;
+
+#define INVALID_CIPHER	0xFFFF
+
+static const NSSSignatureAlgorithms NSS_SCRAMDigestAlgorithm[] = {
+
+	{SEC_OID_PKCS1_MD5_WITH_RSA_ENCRYPTION, SEC_OID_SHA256, SHA256_LENGTH},
+	{SEC_OID_PKCS1_SHA1_WITH_RSA_ENCRYPTION, SEC_OID_SHA256, SHA256_LENGTH},
+	{SEC_OID_ISO_SHA_WITH_RSA_SIGNATURE, SEC_OID_SHA256, SHA256_LENGTH},
+	{SEC_OID_ISO_SHA1_WITH_RSA_SIGNATURE, SEC_OID_SHA256, SHA256_LENGTH},
+	{SEC_OID_PKCS5_PBE_WITH_MD5_AND_DES_CBC, SEC_OID_SHA256, SHA256_LENGTH},
+
+	{SEC_OID_ANSIX962_ECDSA_SHA224_SIGNATURE, SEC_OID_SHA224, SHA224_LENGTH},
+	{SEC_OID_PKCS1_SHA224_WITH_RSA_ENCRYPTION, SEC_OID_SHA224, SHA224_LENGTH},
+	{SEC_OID_NIST_DSA_SIGNATURE_WITH_SHA224_DIGEST, SEC_OID_SHA224, SHA224_LENGTH},
+
+	{SEC_OID_ANSIX962_ECDSA_SHA256_SIGNATURE, SEC_OID_SHA256, SHA256_LENGTH},
+	{SEC_OID_PKCS1_SHA256_WITH_RSA_ENCRYPTION, SEC_OID_SHA256, SHA256_LENGTH},
+	{SEC_OID_NIST_DSA_SIGNATURE_WITH_SHA256_DIGEST, SEC_OID_SHA256, SHA256_LENGTH},
+
+	{SEC_OID_ANSIX962_ECDSA_SHA384_SIGNATURE, SEC_OID_SHA384, SHA384_LENGTH},
+	{SEC_OID_PKCS1_SHA384_WITH_RSA_ENCRYPTION, SEC_OID_SHA384, SHA384_LENGTH},
+
+	{SEC_OID_ANSIX962_ECDSA_SHA512_SIGNATURE, SEC_OID_SHA512, SHA512_LENGTH},
+	{SEC_OID_PKCS1_SHA512_WITH_RSA_ENCRYPTION, SEC_OID_SHA512, SHA512_LENGTH},
+
+	{0, 0}
+};
+
+/*
+ * This list is a partial copy of the ciphers in NSS files lib/ssl/sslproto.h
+ * in order to provide a human readable version of the ciphers. It would be
+ * nice to not have to have this, but NSS doesn't provide any API addressing
+ * the ciphers by name. TODO: do we want more of the ciphers, or perhaps less?
+ */
+static const NSSCiphers NSS_CipherList[] = {
+
+	{"TLS_NULL_WITH_NULL_NULL", TLS_NULL_WITH_NULL_NULL},
+
+	{"TLS_RSA_WITH_NULL_MD5", TLS_RSA_WITH_NULL_MD5},
+	{"TLS_RSA_WITH_NULL_SHA", TLS_RSA_WITH_NULL_SHA},
+	{"TLS_RSA_WITH_RC4_128_MD5", TLS_RSA_WITH_RC4_128_MD5},
+	{"TLS_RSA_WITH_RC4_128_SHA", TLS_RSA_WITH_RC4_128_SHA},
+	{"TLS_RSA_WITH_IDEA_CBC_SHA", TLS_RSA_WITH_IDEA_CBC_SHA},
+	{"TLS_RSA_WITH_DES_CBC_SHA", TLS_RSA_WITH_DES_CBC_SHA},
+	{"TLS_RSA_WITH_3DES_EDE_CBC_SHA", TLS_RSA_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_DH_DSS_WITH_DES_CBC_SHA", TLS_DH_DSS_WITH_DES_CBC_SHA},
+	{"TLS_DH_DSS_WITH_3DES_EDE_CBC_SHA", TLS_DH_DSS_WITH_3DES_EDE_CBC_SHA},
+	{"TLS_DH_RSA_WITH_DES_CBC_SHA", TLS_DH_RSA_WITH_DES_CBC_SHA},
+	{"TLS_DH_RSA_WITH_3DES_EDE_CBC_SHA", TLS_DH_RSA_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_DHE_DSS_WITH_DES_CBC_SHA", TLS_DHE_DSS_WITH_DES_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_3DES_EDE_CBC_SHA", TLS_DHE_DSS_WITH_3DES_EDE_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_DES_CBC_SHA", TLS_DHE_RSA_WITH_DES_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA", TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_DH_anon_WITH_RC4_128_MD5", TLS_DH_anon_WITH_RC4_128_MD5},
+	{"TLS_DH_anon_WITH_DES_CBC_SHA", TLS_DH_anon_WITH_DES_CBC_SHA},
+	{"TLS_DH_anon_WITH_3DES_EDE_CBC_SHA", TLS_DH_anon_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_RSA_WITH_AES_128_CBC_SHA", TLS_RSA_WITH_AES_128_CBC_SHA},
+	{"TLS_DH_DSS_WITH_AES_128_CBC_SHA", TLS_DH_DSS_WITH_AES_128_CBC_SHA},
+	{"TLS_DH_RSA_WITH_AES_128_CBC_SHA", TLS_DH_RSA_WITH_AES_128_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_AES_128_CBC_SHA", TLS_DHE_DSS_WITH_AES_128_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_AES_128_CBC_SHA", TLS_DHE_RSA_WITH_AES_128_CBC_SHA},
+	{"TLS_DH_anon_WITH_AES_128_CBC_SHA", TLS_DH_anon_WITH_AES_128_CBC_SHA},
+
+	{"TLS_RSA_WITH_AES_256_CBC_SHA", TLS_RSA_WITH_AES_256_CBC_SHA},
+	{"TLS_DH_DSS_WITH_AES_256_CBC_SHA", TLS_DH_DSS_WITH_AES_256_CBC_SHA},
+	{"TLS_DH_RSA_WITH_AES_256_CBC_SHA", TLS_DH_RSA_WITH_AES_256_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_AES_256_CBC_SHA", TLS_DHE_DSS_WITH_AES_256_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_AES_256_CBC_SHA", TLS_DHE_RSA_WITH_AES_256_CBC_SHA},
+	{"TLS_DH_anon_WITH_AES_256_CBC_SHA", TLS_DH_anon_WITH_AES_256_CBC_SHA},
+	{"TLS_RSA_WITH_NULL_SHA256", TLS_RSA_WITH_NULL_SHA256},
+	{"TLS_RSA_WITH_AES_128_CBC_SHA256", TLS_RSA_WITH_AES_128_CBC_SHA256},
+	{"TLS_RSA_WITH_AES_256_CBC_SHA256", TLS_RSA_WITH_AES_256_CBC_SHA256},
+
+	{"TLS_DHE_DSS_WITH_AES_128_CBC_SHA256", TLS_DHE_DSS_WITH_AES_128_CBC_SHA256},
+	{"TLS_RSA_WITH_CAMELLIA_128_CBC_SHA", TLS_RSA_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DH_DSS_WITH_CAMELLIA_128_CBC_SHA", TLS_DH_DSS_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DH_RSA_WITH_CAMELLIA_128_CBC_SHA", TLS_DH_RSA_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_CAMELLIA_128_CBC_SHA", TLS_DHE_DSS_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA", TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DH_anon_WITH_CAMELLIA_128_CBC_SHA", TLS_DH_anon_WITH_CAMELLIA_128_CBC_SHA},
+
+	{"TLS_DHE_DSS_WITH_RC4_128_SHA", TLS_DHE_DSS_WITH_RC4_128_SHA},
+	{"TLS_DHE_RSA_WITH_AES_128_CBC_SHA256", TLS_DHE_RSA_WITH_AES_128_CBC_SHA256},
+	{"TLS_DHE_DSS_WITH_AES_256_CBC_SHA256", TLS_DHE_DSS_WITH_AES_256_CBC_SHA256},
+	{"TLS_DHE_RSA_WITH_AES_256_CBC_SHA256", TLS_DHE_RSA_WITH_AES_256_CBC_SHA256},
+
+	{"TLS_RSA_WITH_CAMELLIA_256_CBC_SHA", TLS_RSA_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DH_DSS_WITH_CAMELLIA_256_CBC_SHA", TLS_DH_DSS_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DH_RSA_WITH_CAMELLIA_256_CBC_SHA", TLS_DH_RSA_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_CAMELLIA_256_CBC_SHA", TLS_DHE_DSS_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA", TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DH_anon_WITH_CAMELLIA_256_CBC_SHA", TLS_DH_anon_WITH_CAMELLIA_256_CBC_SHA},
+
+	{"TLS_RSA_WITH_SEED_CBC_SHA", TLS_RSA_WITH_SEED_CBC_SHA},
+
+	{"TLS_RSA_WITH_AES_128_GCM_SHA256", TLS_RSA_WITH_AES_128_GCM_SHA256},
+	{"TLS_RSA_WITH_AES_256_GCM_SHA384", TLS_RSA_WITH_AES_256_GCM_SHA384},
+	{"TLS_DHE_RSA_WITH_AES_128_GCM_SHA256", TLS_DHE_RSA_WITH_AES_128_GCM_SHA256},
+	{"TLS_DHE_RSA_WITH_AES_256_GCM_SHA384", TLS_DHE_RSA_WITH_AES_256_GCM_SHA384},
+	{"TLS_DHE_DSS_WITH_AES_128_GCM_SHA256", TLS_DHE_DSS_WITH_AES_128_GCM_SHA256},
+	{"TLS_DHE_DSS_WITH_AES_256_GCM_SHA384", TLS_DHE_DSS_WITH_AES_256_GCM_SHA384},
+
+	{"TLS_AES_128_GCM_SHA256", TLS_AES_128_GCM_SHA256},
+	{"TLS_AES_256_GCM_SHA384", TLS_AES_256_GCM_SHA384},
+	{"TLS_CHACHA20_POLY1305_SHA256", TLS_CHACHA20_POLY1305_SHA256},
+	{NULL, 0}
+};
+
+/*
+ * pg_find_cipher
+ *			Translate an NSS ciphername to the cipher code
+ *
+ * Searches the configured ciphers for the corresponding cipher code to the
+ * name. Search is performed case insensitive.
+ */
+PRUint16
+pg_find_cipher(char *name)
+{
+	const		NSSCiphers *cipher_list = NSS_CipherList;
+
+	while (cipher_list->name)
+	{
+		if (pg_strcasecmp(cipher_list->name, name) == 0)
+			return cipher_list->number;
+
+		cipher_list++;
+	}
+
+	return 0xFFFF;
+}
+
+#endif							/* USE_NSS */
+
+#endif							/* PG_NSS_H */
diff --git a/src/include/libpq/libpq-be.h b/src/include/libpq/libpq-be.h
index 66a8673d93..ea373a0ae0 100644
--- a/src/include/libpq/libpq-be.h
+++ b/src/include/libpq/libpq-be.h
@@ -193,13 +193,18 @@ typedef struct Port
 	bool		peer_cert_valid;
 
 	/*
-	 * OpenSSL structures. (Keep these last so that the locations of other
-	 * fields are the same whether or not you build with OpenSSL.)
+	 * SSL backend specific structures. (Keep these last so that the locations
+	 * of other fields are the same whether or not you build with SSL
+	 * enabled.)
 	 */
 #ifdef USE_OPENSSL
 	SSL		   *ssl;
 	X509	   *peer;
 #endif
+
+#ifdef USE_NSS
+	void	   *pr_fd;
+#endif
 } Port;
 
 #ifdef USE_SSL
@@ -283,7 +288,7 @@ extern void be_tls_get_peer_serial(Port *port, char *ptr, size_t len);
  * This is not supported with old versions of OpenSSL that don't have
  * the X509_get_signature_nid() function.
  */
-#if defined(USE_OPENSSL) && defined(HAVE_X509_GET_SIGNATURE_NID)
+#if defined(USE_NSS) || (defined(USE_OPENSSL) && defined(HAVE_X509_GET_SIGNATURE_NID))
 #define HAVE_BE_TLS_GET_CERTIFICATE_HASH
 extern char *be_tls_get_certificate_hash(Port *port, size_t *len);
 #endif
@@ -293,6 +298,10 @@ extern char *be_tls_get_certificate_hash(Port *port, size_t *len);
 typedef void (*openssl_tls_init_hook_typ) (SSL_CTX *context, bool isServerStart);
 extern PGDLLIMPORT openssl_tls_init_hook_typ openssl_tls_init_hook;
 #endif
+#ifdef USE_NSS
+typedef void (*nss_tls_init_hook_type) (bool isServerStart);
+extern PGDLLIMPORT nss_tls_init_hook_type nss_tls_init_hook;
+#endif
 
 #endif							/* USE_SSL */
 
diff --git a/src/include/libpq/libpq.h b/src/include/libpq/libpq.h
index a55898c85a..d2860b852f 100644
--- a/src/include/libpq/libpq.h
+++ b/src/include/libpq/libpq.h
@@ -88,6 +88,9 @@ extern PGDLLIMPORT bool ssl_passphrase_command_supports_reload;
 #ifdef USE_SSL
 extern bool ssl_loaded_verify_locations;
 #endif
+#ifdef USE_NSS
+extern char *ssl_database;
+#endif
 
 extern int	secure_initialize(bool isServerStart);
 extern bool secure_loaded_verify_locations(void);
diff --git a/src/include/pg_config.h.in b/src/include/pg_config.h.in
index f4d9f3b408..67a9f90e5e 100644
--- a/src/include/pg_config.h.in
+++ b/src/include/pg_config.h.in
@@ -905,6 +905,9 @@
 /* Define to 1 to build with PAM support. (--with-pam) */
 #undef USE_PAM
 
+/* Define to build with NSS support (--with-nss) */
+#undef USE_NSS
+
 /* Define to 1 to use software CRC-32C implementation (slicing-by-8). */
 #undef USE_SLICING_BY_8_CRC32C
 
diff --git a/src/include/pg_config_manual.h b/src/include/pg_config_manual.h
index d27c8601fa..7861b94290 100644
--- a/src/include/pg_config_manual.h
+++ b/src/include/pg_config_manual.h
@@ -176,10 +176,9 @@
 
 /*
  * USE_SSL code should be compiled only when compiling with an SSL
- * implementation.  (Currently, only OpenSSL is supported, but we might add
- * more implementations in the future.)
+ * implementation.
  */
-#ifdef USE_OPENSSL
+#if defined(USE_OPENSSL) || defined(USE_NSS)
 #define USE_SSL
 #endif
 
diff --git a/src/interfaces/libpq/Makefile b/src/interfaces/libpq/Makefile
index c4fde3f93d..837e105ffe 100644
--- a/src/interfaces/libpq/Makefile
+++ b/src/interfaces/libpq/Makefile
@@ -45,12 +45,21 @@ OBJS = \
 	pqexpbuffer.o \
 	fe-auth.o
 
-ifeq ($(with_openssl),yes)
+ifneq ($(with_ssl),no)
+OBJS += \
+	fe-secure-common.o
+endif
+
+ifeq ($(with_ssl),openssl)
 OBJS += \
-	fe-secure-common.o \
 	fe-secure-openssl.o
 endif
 
+ifeq ($(with_ssl), nss)
+OBJS += \
+	fe-secure-nss.o
+endif
+
 ifeq ($(with_gssapi),yes)
 OBJS += \
 	fe-gssapi-common.o \
diff --git a/src/interfaces/libpq/fe-connect.c b/src/interfaces/libpq/fe-connect.c
index 2b78ed8ec3..79d3a35009 100644
--- a/src/interfaces/libpq/fe-connect.c
+++ b/src/interfaces/libpq/fe-connect.c
@@ -355,6 +355,10 @@ static const internalPQconninfoOption PQconninfoOptions[] = {
 		"Target-Session-Attrs", "", 11, /* sizeof("read-write") = 11 */
 	offsetof(struct pg_conn, target_session_attrs)},
 
+	{"cert_database", NULL, NULL, NULL,
+		"CertificateDatabase", "", 64,
+	offsetof(struct pg_conn, cert_database)},
+
 	/* Terminating entry --- MUST BE LAST */
 	{NULL, NULL, NULL, NULL,
 	NULL, NULL, 0}
diff --git a/src/interfaces/libpq/fe-secure-nss.c b/src/interfaces/libpq/fe-secure-nss.c
new file mode 100644
index 0000000000..dca0572e67
--- /dev/null
+++ b/src/interfaces/libpq/fe-secure-nss.c
@@ -0,0 +1,1112 @@
+/*-------------------------------------------------------------------------
+ *
+ * fe-secure-nss.c
+ *	  functions for supporting NSS as a TLS backend for frontend libpq
+ *
+ * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ *	  src/interfaces/libpq/fe-secure-nss.c
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#include "postgres_fe.h"
+
+#include "libpq-fe.h"
+#include "fe-auth.h"
+#include "fe-secure-common.h"
+#include "libpq-int.h"
+#include "common/pg_nss.h"
+
+/*
+ * BITS_PER_BYTE is also defined in the NSPR header files, so we need to undef
+ * our version to avoid compiler warnings on redefinition.
+ */
+#define pg_BITS_PER_BYTE BITS_PER_BYTE
+#undef BITS_PER_BYTE
+
+/*
+ * The nspr/obsolete/protypes.h NSPR header typedefs uint64 and int64 with
+ * colliding definitions from ours, causing a much expected compiler error.
+ * Remove backwards compatibility with ancient NSPR versions to avoid this.
+ */
+#define NO_NSPR_10_SUPPORT
+#include <nspr/nspr.h>
+#include <nspr/prerror.h>
+#include <nspr/prinit.h>
+#include <nspr/prio.h>
+#include <nss/hasht.h>
+#include <nss/nss.h>
+#include <nss/ssl.h>
+#include <nss/sslproto.h>
+#include <nss/pk11func.h>
+#include <nss/secerr.h>
+#include <nss/secoidt.h>
+#include <nss/secmod.h>
+
+/*
+ * Ensure that the colliding definitions match, else throw an error. In case
+ * NSPR remove the definition in a future version (however unlikely that may
+ * be, make sure to put ours back again.
+ */
+#if defined(BITS_PER_BYTE)
+#if BITS_PER_BYTE != pg_BITS_PER_BYTE
+#error "incompatible byte widths between NSPR and PostgreSQL"
+#endif
+#else
+#define BITS_PER_BYTE pg_BITS_PER_BYTE
+#endif
+#undef pg_BITS_PER_BYTE
+
+static SECStatus pg_load_nss_module(SECMODModule * *module, const char *library, const char *name);
+static SECStatus pg_bad_cert_handler(void *arg, PRFileDesc * fd);
+static const char *pg_SSLerrmessage(PRErrorCode errcode);
+static SECStatus pg_client_auth_handler(void *arg, PRFileDesc * socket, CERTDistNames * caNames,
+										CERTCertificate * *pRetCert, SECKEYPrivateKey * *pRetKey);
+static SECStatus pg_cert_auth_handler(void *arg, PRFileDesc * fd, PRBool checksig, PRBool isServer);
+static int	ssl_protocol_version_to_nss(const char *protocol);
+static bool cert_database_has_CA(PGconn *conn);
+
+static char *PQssl_passwd_cb(PK11SlotInfo * slot, PRBool retry, void *arg);
+
+/*
+ * PR_ImportTCPSocket() is a private API, but very widely used, as it's the
+ * only way to make NSS use an already set up POSIX file descriptor rather
+ * than opening one itself. To quote the NSS documentation:
+ *
+ *		"In theory, code that uses PR_ImportTCPSocket may break when NSPR's
+ *		implementation changes. In practice, this is unlikely to happen because
+ *		NSPR's implementation has been stable for years and because of NSPR's
+ *		strong commitment to backward compatibility."
+ *
+ * https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSPR/Reference/PR_ImportTCPSocket
+ *
+ * The function is declared in <private/pprio.h>, but as it is a header marked
+ * private we declare it here rather than including it.
+ */
+NSPR_API(PRFileDesc *) PR_ImportTCPSocket(int);
+
+static SECMODModule * ca_trust = NULL;
+static NSSInitContext * nss_context = NULL;
+
+/*
+ * This logic exist in NSS as well, but it's only available for when there is
+ * a database to open, and not only using the system trust store. Thus, we
+ * need to keep our own copy.
+ */
+#if defined(WIN32)
+static const char *ca_trust_name = "nssckbi.dll";
+#elif defined(__darwin__)
+static const char *ca_trust_name = "libnssckbi.dylib";
+#else
+static const char *ca_trust_name = "libnssckbi.so";
+#endif
+
+static PQsslKeyPassHook_nss_type PQsslKeyPassHook = NULL;
+
+/* ------------------------------------------------------------ */
+/*			 Procedures common to all secure sessions			*/
+/* ------------------------------------------------------------ */
+
+/*
+ * pgtls_init_library
+ *
+ * There is no direct equivalent for PQinitOpenSSL in NSS/NSPR, with PR_Init
+ * being the closest match there is. PR_Init is however already documented to
+ * not be required so simply making this a noop seems like the best option.
+ */
+void
+pgtls_init_library(bool do_ssl, int do_crypto)
+{
+	/* noop */
+}
+
+int
+pgtls_init(PGconn *conn)
+{
+	conn->ssl_in_use = false;
+	conn->has_password = false;
+
+	return 0;
+}
+
+void
+pgtls_close(PGconn *conn)
+{
+	if (nss_context)
+	{
+		NSS_ShutdownContext(nss_context);
+		nss_context = NULL;
+	}
+}
+
+PostgresPollingStatusType
+pgtls_open_client(PGconn *conn)
+{
+	SECStatus	status;
+	PRFileDesc *pr_fd;
+	PRFileDesc *model;
+	NSSInitParameters params;
+	SSLVersionRange desired_range;
+
+	/*
+	 * The NSPR documentation states that runtime initialization via PR_Init
+	 * is no longer required, as the first caller into NSPR will perform the
+	 * initialization implicitly. See be-secure-nss.c for further discussion
+	 * on PR_Init.
+	 */
+	PR_Init(PR_USER_THREAD, PR_PRIORITY_NORMAL, 0);
+
+	/*
+	 * NSS initialization and the use of contexts is further discussed in
+	 * be-secure-nss.c
+	 */
+	memset(&params, 0, sizeof(params));
+	params.length = sizeof(params);
+
+	if (conn->cert_database && strlen(conn->cert_database) > 0)
+	{
+		char	   *cert_database_path = psprintf("sql:%s", conn->cert_database);
+
+		nss_context = NSS_InitContext(cert_database_path, "", "", "",
+									  &params,
+									  NSS_INIT_READONLY | NSS_INIT_PK11RELOAD);
+		pfree(cert_database_path);
+
+		if (!nss_context)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("unable to open certificate database \"%s\": %s"),
+							  conn->cert_database,
+							  pg_SSLerrmessage(PR_GetError()));
+			return PGRES_POLLING_FAILED;
+		}
+	}
+	else
+	{
+		nss_context = NSS_InitContext("", "", "", "", &params,
+									  NSS_INIT_READONLY | NSS_INIT_NOCERTDB |
+									  NSS_INIT_NOMODDB | NSS_INIT_FORCEOPEN |
+									  NSS_INIT_NOROOTINIT | NSS_INIT_PK11RELOAD);
+		if (!nss_context)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("unable to create certificate database: %s"),
+							  pg_SSLerrmessage(PR_GetError()));
+			return PGRES_POLLING_FAILED;
+		}
+	}
+
+	/*
+	 * Configure cipher policy.
+	 */
+	status = NSS_SetDomesticPolicy();
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to configure cipher policy: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * If we don't have a certificate database, the system trust store is the
+	 * fallback we can use. If we fail to initialize that as well, we can
+	 * still attempt a connection as long as the sslmode isn't verify*.
+	 */
+	if (!conn->cert_database && conn->sslmode[0] == 'v')
+	{
+		status = pg_load_nss_module(&ca_trust, ca_trust_name, "\"Root Certificates\"");
+		if (status != SECSuccess)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("WARNING: unable to load NSS trust module \"%s\" : %s"),
+							  ca_trust_name,
+							  pg_SSLerrmessage(PR_GetError()));
+
+			return PGRES_POLLING_FAILED;
+		}
+	}
+
+
+	PK11_SetPasswordFunc(PQssl_passwd_cb);
+
+	/*
+	 * Import the already opened socket as we don't want to use NSPR functions
+	 * for opening the network socket due to how the PostgreSQL protocol works
+	 * with TLS connections. This function is not part of the NSPR public API,
+	 * see the comment at the top of the file for the rationale of still using
+	 * it.
+	 */
+	pr_fd = PR_ImportTCPSocket(conn->sock);
+	if (!pr_fd)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to attach to socket: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * Most of the documentation available, and implementations of, NSS/NSPR
+	 * use the PR_NewTCPSocket() function here, which has the drawback that it
+	 * can only create IPv4 sockets. Instead use PR_OpenTCPSocket() which
+	 * copes with IPv6 as well.
+	 */
+	model = SSL_ImportFD(NULL, PR_OpenTCPSocket(conn->laddr.addr.ss_family));
+	if (!model)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to enable TLS: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/* Disable old protocol versions (SSLv2 and SSLv3) */
+	SSL_OptionSet(model, SSL_ENABLE_SSL2, PR_FALSE);
+	SSL_OptionSet(model, SSL_V2_COMPATIBLE_HELLO, PR_FALSE);
+	SSL_OptionSet(model, SSL_ENABLE_SSL3, PR_FALSE);
+
+#ifdef SSL_CBC_RANDOM_IV
+
+	/*
+	 * Enable protection against the BEAST attack in case the NSS library has
+	 * support for that. While SSLv3 is disabled, we may still allow TLSv1
+	 * which is affected. The option isn't documented as an SSL option, but as
+	 * an NSS environment variable.
+	 */
+	SSL_OptionSet(model, SSL_CBC_RANDOM_IV, PR_TRUE);
+#endif
+
+	/* Set us up as a TLS client for the handshake */
+	SSL_OptionSet(model, SSL_HANDSHAKE_AS_CLIENT, PR_TRUE);
+
+	/*
+	 * When setting the available protocols, we either use the user defined
+	 * configuration values, and if missing we accept whatever is the highest
+	 * version supported by the library as the max and only limit the range in
+	 * the other end at TLSv1.0. ssl_variant_stream is a ProtocolVariant enum
+	 * for Stream protocols, rather than datagram.
+	 */
+	SSL_VersionRangeGetSupported(ssl_variant_stream, &desired_range);
+	desired_range.min = SSL_LIBRARY_VERSION_TLS_1_0;
+
+	if (conn->ssl_min_protocol_version && strlen(conn->ssl_min_protocol_version) > 0)
+	{
+		int			ssl_min_ver = ssl_protocol_version_to_nss(conn->ssl_min_protocol_version);
+
+		if (ssl_min_ver == -1)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("invalid value \"%s\" for minimum version of SSL protocol\n"),
+							  conn->ssl_min_protocol_version);
+			return -1;
+		}
+
+		desired_range.min = ssl_min_ver;
+	}
+
+	if (conn->ssl_max_protocol_version && strlen(conn->ssl_max_protocol_version) > 0)
+	{
+		int			ssl_max_ver = ssl_protocol_version_to_nss(conn->ssl_max_protocol_version);
+
+		if (ssl_max_ver == -1)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("invalid value \"%s\" for maximum version of SSL protocol\n"),
+							  conn->ssl_max_protocol_version);
+			return -1;
+		}
+
+		desired_range.max = ssl_max_ver;
+	}
+
+	if (SSL_VersionRangeSet(model, &desired_range) != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to set allowed SSL protocol version range: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * Set up callback for verifying server certificates, as well as for how
+	 * to handle failed verifications.
+	 */
+	SSL_AuthCertificateHook(model, pg_cert_auth_handler, (void *) conn);
+	SSL_BadCertHook(model, pg_bad_cert_handler, (void *) conn);
+
+	/*
+	 * Convert the NSPR socket to an SSL socket. Ensuring the success of this
+	 * operation is critical as NSS SSL_* functions may return SECSuccess on
+	 * the socket even though SSL hasn't been enabled, which introduce a risk
+	 * of silent downgrades.
+	 */
+	conn->pr_fd = SSL_ImportFD(model, pr_fd);
+	if (!conn->pr_fd)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to configure client for TLS: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * The model can now we closed as we've applied the settings of the model
+	 * onto the real socket. From hereon we should only use conn->pr_fd.
+	 */
+	PR_Close(model);
+
+	/* Set the private data to be passed to the password callback */
+	SSL_SetPKCS11PinArg(conn->pr_fd, (void *) conn);
+
+	/*
+	 * If a CRL file has been specified, verify if it exists in the database
+	 * but don't fail in case it doesn't.
+	 */
+	if (conn->sslcrl && strlen(conn->sslcrl) > 0)
+	{
+		/* XXX: Implement me.. */
+	}
+
+	status = SSL_ResetHandshake(conn->pr_fd, PR_FALSE);
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to initiate handshake: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * Set callback for client authentication when requested by the server.
+	 */
+	SSL_GetClientAuthDataHook(conn->pr_fd, pg_client_auth_handler, (void *) conn);
+
+	/*
+	 * Specify which hostname we are expecting to talk to. This is required,
+	 * albeit mostly applies to when opening a connection to a traditional
+	 * http server it seems.
+	 */
+	SSL_SetURL(conn->pr_fd, (conn->connhost[conn->whichhost]).host);
+
+	do
+	{
+		status = SSL_ForceHandshake(conn->pr_fd);
+	}
+	while (status != SECSuccess && PR_GetError() == PR_WOULD_BLOCK_ERROR);
+
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("SSL error: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	conn->ssl_in_use = true;
+	return PGRES_POLLING_OK;
+}
+
+ssize_t
+pgtls_read(PGconn *conn, void *ptr, size_t len)
+{
+	PRInt32		nread;
+	PRErrorCode status;
+	int			read_errno = 0;
+
+	/*
+	 * PR_Recv blocks until there is data to read or the timeout expires. We
+	 * don't want to sit blocked here, so the timeout is turned off by using
+	 * PR_INTERVAL_NO_WAIT which means "return immediately",  Zero is returned
+	 * for closed connections, while -1 indicates an error within the ongoing
+	 * connection.
+	 */
+	nread = PR_Recv(conn->pr_fd, ptr, len, 0, PR_INTERVAL_NO_WAIT);
+
+	if (nread == 0)
+	{
+		read_errno = ECONNRESET;
+		nread = -1;
+	}
+	else if (nread == -1)
+	{
+		status = PR_GetError();
+
+		switch (status)
+		{
+			case PR_IO_TIMEOUT_ERROR:
+				/* No data available yet. */
+				nread = 0;
+				break;
+
+			case PR_WOULD_BLOCK_ERROR:
+				read_errno = EWOULDBLOCK;
+				break;
+
+				/*
+				 * The error cases for PR_Recv are not documented, but can be
+				 * reverse engineered from _MD_unix_map_default_error() in the
+				 * NSPR code, defined in pr/src/md/unix/unix_errors.c.
+				 */
+			case PR_NETWORK_UNREACHABLE_ERROR:
+			case PR_CONNECT_RESET_ERROR:
+				read_errno = ECONNRESET;
+				break;
+
+			default:
+				break;
+		}
+
+		if (nread == -1)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("TLS read error: %s"),
+							  pg_SSLerrmessage(status));
+		}
+	}
+
+	SOCK_ERRNO_SET(read_errno);
+	return (ssize_t) nread;
+}
+
+/*
+ * pgtls_read_pending
+ *		Check for the existence of data to be read.
+ *
+ * This is part of the PostgreSQL TLS backend API.
+ */
+bool
+pgtls_read_pending(PGconn *conn)
+{
+	unsigned char c;
+	int			n;
+
+	/*
+	 * PR_Recv peeks into the stream with the timeount turned off, to see if
+	 * there is another byte to read off the wire. There is an NSS function
+	 * SSL_DataPending() which might seem like a better fit, but it will only
+	 * check already encrypted data in the SSL buffer, not still unencrypted
+	 * data, thus it doesn't guarantee that a subsequent call to
+	 * PR_Read/PR_Recv won't block.
+	 */
+	n = PR_Recv(conn->pr_fd, &c, 1, PR_MSG_PEEK, PR_INTERVAL_NO_WAIT);
+	return (n > 0);
+}
+
+ssize_t
+pgtls_write(PGconn *conn, const void *ptr, size_t len)
+{
+	PRInt32		n;
+	PRErrorCode status;
+	int			write_errno = 0;
+
+	n = PR_Write(conn->pr_fd, ptr, len);
+
+	if (n < 0)
+	{
+		status = PR_GetError();
+
+		switch (status)
+		{
+			case PR_WOULD_BLOCK_ERROR:
+#ifdef EAGAIN
+				write_errno = EAGAIN;
+#else
+				write_errno = EINTR;
+#endif
+				break;
+
+			default:
+				printfPQExpBuffer(&conn->errorMessage,
+								  libpq_gettext("TLS write error: %s"),
+								  pg_SSLerrmessage(status));
+				write_errno = ECONNRESET;
+				break;
+		}
+	}
+
+	SOCK_ERRNO_SET(write_errno);
+	return (ssize_t) n;
+}
+
+char *
+pgtls_get_peer_certificate_hash(PGconn *conn, size_t *len)
+{
+	CERTCertificate *server_cert;
+	SECOidTag	signature_alg;
+	SECOidTag	digest_alg;
+	int			digest_len;
+	const NSSSignatureAlgorithms *candidate;
+	PLArenaPool *arena;
+	SECItem		digest;
+	char	   *ret;
+	SECStatus	status;
+
+	*len = 0;
+
+	server_cert = SSL_PeerCertificate(conn->pr_fd);
+	if (!server_cert)
+		return NULL;
+
+	signature_alg = SECOID_GetAlgorithmTag(&server_cert->signature);
+
+	candidate = NSS_SCRAMDigestAlgorithm;
+	while (candidate->signature)
+	{
+		if (signature_alg == candidate->signature)
+		{
+			digest_alg = candidate->hash;
+			digest_len = candidate->len;
+			break;
+		}
+
+		candidate++;
+	}
+
+	if (!candidate->signature)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("could not find digest for OID '%s'\n"),
+						  SECOID_FindOIDTagDescription(signature_alg));
+		return NULL;
+	}
+
+	arena = PORT_NewArena(SEC_ASN1_DEFAULT_ARENA_SIZE);
+	digest.data = PORT_ArenaZAlloc(arena, sizeof(unsigned char) * digest_len);
+	digest.len = digest_len;
+
+	status = PK11_HashBuf(digest_alg, digest.data, server_cert->derCert.data,
+						  server_cert->derCert.len);
+
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to generate peer certificate digest: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		PORT_FreeArena(arena, PR_TRUE);
+		return NULL;
+	}
+
+	ret = pg_malloc(digest.len);
+	memcpy(ret, digest.data, digest.len);
+	*len = digest_len;
+	PORT_FreeArena(arena, PR_TRUE);
+
+	return ret;
+}
+
+/*
+ *	Verify that the server certificate matches the hostname we connected to.
+ *
+ * The certificate's Common Name and Subject Alternative Names are considered.
+ */
+int
+pgtls_verify_peer_name_matches_certificate_guts(PGconn *conn,
+												int *names_examined,
+												char **first_name)
+{
+	char	   *server_hostname = NULL;
+	CERTCertificate *server_cert = NULL;
+	SECStatus	status = SECSuccess;
+	SECItem		altname_item;
+	PLArenaPool *arena = NULL;
+	CERTGeneralName *san_list;
+	CERTGeneralName *cn;
+
+	server_hostname = SSL_RevealURL(conn->pr_fd);
+	if (!server_hostname || server_hostname[0] == '\0')
+		goto done;
+
+	/*
+	 * CERT_VerifyCertName will internally perform RFC 2818 SubjectAltName
+	 * verification.
+	 */
+	server_cert = SSL_PeerCertificate(conn->pr_fd);
+	status = CERT_VerifyCertName(server_cert, server_hostname);
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to verify server hostname: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		goto done;
+	}
+
+	status = CERT_FindCertExtension(server_cert, SEC_OID_X509_SUBJECT_ALT_NAME,
+									&altname_item);
+	if (status == SECSuccess)
+	{
+		arena = PORT_NewArena(DER_DEFAULT_CHUNKSIZE);
+		if (!arena)
+		{
+			status = SECFailure;
+			goto done;
+		}
+		san_list = CERT_DecodeAltNameExtension(arena, &altname_item);
+		if (!san_list)
+		{
+			status = SECFailure;
+			goto done;
+		}
+
+		for (cn = san_list; cn != san_list; cn = CERT_GetNextGeneralName(cn))
+		{
+			char	   *alt_name;
+			int			rv;
+			char		tmp[512];
+
+			status = CERT_RFC1485_EscapeAndQuote(tmp, sizeof(tmp),
+												 (char *) cn->name.other.data,
+												 cn->name.other.len);
+
+			if (status != SECSuccess)
+				goto done;
+
+			rv = pq_verify_peer_name_matches_certificate_name(conn, tmp,
+															  strlen(tmp),
+															  &alt_name);
+			if (alt_name)
+			{
+				if (!*first_name)
+					*first_name = alt_name;
+				else
+					free(alt_name);
+			}
+
+			if (rv == 1)
+				status = SECSuccess;
+			else
+			{
+				status = SECFailure;
+				break;
+			}
+		}
+	}
+	else if (PORT_GetError() == SEC_ERROR_EXTENSION_NOT_FOUND)
+		status = SECSuccess;
+	else
+		status = SECSuccess;
+
+done:
+	/* san_list will be freed by freeing the arena it was allocated in */
+	if (arena)
+		PORT_FreeArena(arena, PR_TRUE);
+	PR_Free(server_hostname);
+
+	if (status == SECSuccess)
+		return 1;
+
+	return 0;
+}
+
+/* ------------------------------------------------------------ */
+/*			PostgreSQL specific TLS support functions			*/
+/* ------------------------------------------------------------ */
+
+static const char *
+pg_SSLerrmessage(PRErrorCode errcode)
+{
+	const char *error;
+
+	/*
+	 * Try to get the user friendly error description, and if that fails try
+	 * to fall back on the name of the PRErrorCode.
+	 */
+	error = PR_ErrorToString(errcode, PR_LANGUAGE_I_DEFAULT);
+	if (!error)
+		error = PR_ErrorToName(errcode);
+	if (error)
+		return error;
+
+	return "unknown TLS error";
+}
+
+static SECStatus
+pg_load_nss_module(SECMODModule * *module, const char *library, const char *name)
+{
+	SECMODModule *mod;
+	char	   *modulespec;
+
+	modulespec = psprintf("library=\"%s\", name=\"%s\"", library, name);
+
+	/*
+	 * Attempt to load the specified module. The second parameter is "parent"
+	 * which should always be NULL for application code. The third parameter
+	 * defines if loading should recurse which is only applicable when loading
+	 * a module from within another module. This hierarchy would have to be
+	 * defined in the modulespec, and since we don't support anything but
+	 * directly addressed modules we should pass PR_FALSE.
+	 */
+	mod = SECMOD_LoadUserModule(modulespec, NULL, PR_FALSE);
+	pfree(modulespec);
+
+	if (mod && mod->loaded)
+	{
+		*module = mod;
+		return SECSuccess;
+	}
+
+	SECMOD_DestroyModule(mod);
+	return SECFailure;
+}
+
+/* ------------------------------------------------------------ */
+/*						NSS Callbacks							*/
+/* ------------------------------------------------------------ */
+
+/*
+ * pg_cert_auth_handler
+ *			Callback for authenticating server certificate
+ *
+ * This is pretty much the same procedure as the SSL_AuthCertificate function
+ * provided by NSS, with the difference being server hostname validation. With
+ * SSL_AuthCertificate there is no way to do verify-ca, it only does the -full
+ * flavor of our sslmodes, so we need our own implementation.
+ */
+static SECStatus
+pg_cert_auth_handler(void *arg, PRFileDesc *fd, PRBool checksig, PRBool isServer)
+{
+	SECStatus	status;
+	PGconn	   *conn = (PGconn *) arg;
+	CERTCertificate *server_cert;
+	void	   *pin;
+
+	Assert(!isServer);
+
+	pin = SSL_RevealPinArg(conn->pr_fd);
+	server_cert = SSL_PeerCertificate(conn->pr_fd);
+
+	status = CERT_VerifyCertificateNow((CERTCertDBHandle *) CERT_GetDefaultCertDB(),
+									   server_cert,
+									   checksig,
+									   certificateUsageSSLServer,
+									   pin,
+									   NULL);
+
+	/*
+	 * If we've already failed validation then there is no point in also
+	 * performing the hostname check for verify-full.
+	 */
+	if (status == SECSuccess)
+	{
+		if (!pq_verify_peer_name_matches_certificate(conn))
+			status = SECFailure;
+	}
+	else
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to verify certificate: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+	}
+
+	return status;
+}
+
+/*
+ * pg_client_auth_handler
+ *		Callback for client certificate validation
+ *
+ * The client auth callback is not on by default in NSS, so we need to invoke
+ * it ourselves to ensure we can do cert authentication. A TODO is to support
+ * running without a specified sslcert parameter. By retrieving all the certs
+ * via nickname from the cert database and see if we find one which apply with
+ * NSS_CmpCertChainWCANames() and PK11_FindKeyByAnyCert() we could support
+ * just running with a ssl database specified.
+ *
+ * For now, we use the default client certificate validation which requires a
+ * defined nickname to identify the cert in the database.
+ */
+static SECStatus
+pg_client_auth_handler(void *arg, PRFileDesc * socket, CERTDistNames * caNames,
+					   CERTCertificate * *pRetCert, SECKEYPrivateKey * *pRetKey)
+{
+	PGconn	   *conn = (PGconn *) arg;
+
+	return NSS_GetClientAuthData(conn->sslcert, socket, caNames, pRetCert, pRetKey);
+}
+
+/*
+ * pg_bad_cert_handler
+ *		Callback for failed certificate validation
+ *
+ * The TLS handshake will call this function iff the server certificate failed
+ * validation. Depending on the sslmode, we allow the connection anyways.
+ */
+static SECStatus
+pg_bad_cert_handler(void *arg, PRFileDesc * fd)
+{
+	PGconn	   *conn = (PGconn *) arg;
+	PRErrorCode err;
+
+	/*
+	 * This really shouldn't happen, as we've set the PGconn object as our
+	 * callback data, and at the callsite we know it will be populated. That
+	 * being said, the NSS code itself performs this check even when it should
+	 * not be required so let's use the same belts with our suspenders.
+	 */
+	if (!arg)
+		return SECFailure;
+
+	/*
+	 * For sslmodes other than verify-full and verify-ca we don't perform peer
+	 * validation, so return immediately.  sslmode require with a database
+	 * specified which contains a CA certificate will work like verify-ca to
+	 * be compatible with the OpenSSL implementation.
+	 */
+	if (strcmp(conn->sslmode, "require") == 0)
+	{
+		if (conn->cert_database && strlen(conn->cert_database) > 0 && cert_database_has_CA(conn))
+			return SECFailure;
+	}
+	if (conn->sslmode[0] == 'v')
+		return SECFailure;
+
+	err = PORT_GetError();
+
+	/*
+	 * TODO: these are relevant error codes that can occur in certificate
+	 * validation, figure out which we don't want for require/prefer etc.
+	 */
+	switch (err)
+	{
+		case SEC_ERROR_INVALID_AVA:
+		case SEC_ERROR_INVALID_TIME:
+		case SEC_ERROR_BAD_SIGNATURE:
+		case SEC_ERROR_EXPIRED_CERTIFICATE:
+		case SEC_ERROR_UNKNOWN_ISSUER:
+		case SEC_ERROR_UNTRUSTED_ISSUER:
+		case SEC_ERROR_UNTRUSTED_CERT:
+		case SEC_ERROR_CERT_VALID:
+		case SEC_ERROR_EXPIRED_ISSUER_CERTIFICATE:
+		case SEC_ERROR_CRL_EXPIRED:
+		case SEC_ERROR_CRL_BAD_SIGNATURE:
+		case SEC_ERROR_EXTENSION_VALUE_INVALID:
+		case SEC_ERROR_CA_CERT_INVALID:
+		case SEC_ERROR_CERT_USAGES_INVALID:
+		case SEC_ERROR_UNKNOWN_CRITICAL_EXTENSION:
+			return SECSuccess;
+			break;
+		default:
+			return SECFailure;
+			break;
+	}
+
+	/* Unreachable */
+	return SECSuccess;
+}
+
+/* ------------------------------------------------------------ */
+/*					SSL information functions					*/
+/* ------------------------------------------------------------ */
+
+/*
+ * PQgetssl
+ *
+ * Return NULL as this is legacy and defined to always be equal to calling
+ * PQsslStruct(conn, "OpenSSL"); This should ideally trigger a logged warning
+ * somewhere as it's nonsensical to run in a non-OpenSSL build, but the color
+ * of said bikeshed hasn't yet been determined.
+ */
+void *
+PQgetssl(PGconn *conn)
+{
+	return NULL;
+}
+
+void *
+PQsslStruct(PGconn *conn, const char *struct_name)
+{
+	if (!conn)
+		return NULL;
+
+	/*
+	 * Return the underlying PRFileDesc which can be used to access
+	 * information on the connection details. There is no SSL context per se.
+	 */
+	if (strcmp(struct_name, "NSS") == 0)
+		return conn->pr_fd;
+	return NULL;
+}
+
+const char *const *
+PQsslAttributeNames(PGconn *conn)
+{
+	static const char *const result[] = {
+		"library",
+		"cipher",
+		"protocol",
+		"key_bits",
+		"compression",
+		NULL
+	};
+
+	return result;
+}
+
+const char *
+PQsslAttribute(PGconn *conn, const char *attribute_name)
+{
+	SECStatus	status;
+	SSLChannelInfo channel;
+	SSLCipherSuiteInfo suite;
+
+	if (!conn || !conn->pr_fd)
+		return NULL;
+
+	if (strcmp(attribute_name, "library") == 0)
+		return "NSS";
+
+	status = SSL_GetChannelInfo(conn->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+		return NULL;
+
+	status = SSL_GetCipherSuiteInfo(channel.cipherSuite, &suite, sizeof(suite));
+	if (status != SECSuccess)
+		return NULL;
+
+	if (strcmp(attribute_name, "cipher") == 0)
+		return suite.cipherSuiteName;
+
+	if (strcmp(attribute_name, "key_bits") == 0)
+	{
+		static char key_bits_str[8];
+
+		snprintf(key_bits_str, sizeof(key_bits_str), "%i", suite.effectiveKeyBits);
+		return key_bits_str;
+	}
+
+	if (strcmp(attribute_name, "protocol") == 0)
+	{
+		switch (channel.protocolVersion)
+		{
+#ifdef SSL_LIBRARY_VERSION_TLS_1_3
+			case SSL_LIBRARY_VERSION_TLS_1_3:
+				return "TLSv1.3";
+#endif
+#ifdef SSL_LIBRARY_VERSION_TLS_1_2
+			case SSL_LIBRARY_VERSION_TLS_1_2:
+				return "TLSv1.2";
+#endif
+#ifdef SSL_LIBRARY_VERSION_TLS_1_1
+			case SSL_LIBRARY_VERSION_TLS_1_1:
+				return "TLSv1.1";
+#endif
+			case SSL_LIBRARY_VERSION_TLS_1_0:
+				return "TLSv1.0";
+			default:
+				return "unknown";
+		}
+	}
+
+	/*
+	 * NSS disabled support for compression in version 3.33, and it was only
+	 * available for SSLv3 at that point anyways, so we can safely return off
+	 * here without checking.
+	 */
+	if (strcmp(attribute_name, "compression") == 0)
+		return "off";
+
+	return NULL;
+}
+
+static int
+ssl_protocol_version_to_nss(const char *protocol)
+{
+	if (pg_strcasecmp("TLSv1", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_0;
+
+#ifdef SSL_LIBRARY_VERSION_TLS_1_1
+	if (pg_strcasecmp("TLSv1.1", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_1;
+#endif
+
+#ifdef SSL_LIBRARY_VERSION_TLS_1_2
+	if (pg_strcasecmp("TLSv1.2", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_2;
+#endif
+
+#ifdef SSL_LIBRARY_VERSION_TLS_1_3
+	if (pg_strcasecmp("TLSv1.3", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_3;
+#endif
+
+	return -1;
+}
+
+/*
+ * cert_database_has_CA
+ *
+ * Returns true in case there is a CA certificate in the database connected
+ * to in the conn object, else false. This function only checks for the
+ * presence of a CA certificate, not it's validity and/or usefulness.
+ */
+static bool
+cert_database_has_CA(PGconn *conn)
+{
+	CERTCertList *certificates;
+	bool		hasCA;
+
+	/*
+	 * If the certificate database has a password we must provide it, since
+	 * this API doesn't invoke the standard password callback.
+	 */
+	if (conn->has_password)
+		certificates = PK11_ListCerts(PK11CertListCA, PQssl_passwd_cb(NULL, PR_FALSE, (void *) conn));
+	else
+		certificates = PK11_ListCerts(PK11CertListCA, NULL);
+	hasCA = !CERT_LIST_EMPTY(certificates);
+	CERT_DestroyCertList(certificates);
+
+	return hasCA;
+}
+
+PQsslKeyPassHook_nss_type
+PQgetSSLKeyPassHook_nss(void)
+{
+	return PQsslKeyPassHook;
+}
+
+void
+PQsetSSLKeyPassHook_nss(PQsslKeyPassHook_nss_type hook)
+{
+	PQsslKeyPassHook = hook;
+}
+
+/*
+ * Supply a password to decrypt a client certificate.
+ *
+ * This must match NSS type PK11PasswordFunc.
+ */
+static char *
+PQssl_passwd_cb(PK11SlotInfo *slot, PRBool retry, void *arg)
+{
+	PGconn	   *conn = (PGconn *) arg;
+
+	conn->has_password = true;
+
+	if (PQsslKeyPassHook)
+		return PQsslKeyPassHook(slot, (PRBool) retry, arg);
+	else
+		return PQdefaultSSLKeyPassHook_nss(slot, retry, arg);
+}
+
+/*
+ * The default password handler callback.
+ */
+char *
+PQdefaultSSLKeyPassHook_nss(PK11SlotInfo * slot, PRBool retry, void *arg)
+{
+	PGconn	   *conn = (PGconn *) arg;
+
+	/*
+	 * If the password didn't work the first time there is no point in
+	 * retrying as it hasn't changed.
+	 */
+	if (retry != PR_TRUE && conn->sslpassword && strlen(conn->sslpassword) > 0)
+		return PORT_Strdup(conn->sslpassword);
+
+	return NULL;
+}
diff --git a/src/interfaces/libpq/fe-secure.c b/src/interfaces/libpq/fe-secure.c
index 67b1e78512..0a1e47c5a2 100644
--- a/src/interfaces/libpq/fe-secure.c
+++ b/src/interfaces/libpq/fe-secure.c
@@ -427,6 +427,9 @@ PQsslAttributeNames(PGconn *conn)
 
 	return result;
 }
+#endif							/* USE_SSL */
+
+#ifndef USE_OPENSSL
 
 PQsslKeyPassHook_OpenSSL_type
 PQgetSSLKeyPassHook_OpenSSL(void)
@@ -445,7 +448,7 @@ PQdefaultSSLKeyPassHook_OpenSSL(char *buf, int size, PGconn *conn)
 {
 	return 0;
 }
-#endif							/* USE_SSL */
+#endif							/* USE_OPENSSL */
 
 /* Dummy version of GSSAPI information functions, when built without GSS support */
 #ifndef ENABLE_GSS
diff --git a/src/interfaces/libpq/libpq-fe.h b/src/interfaces/libpq/libpq-fe.h
index c266ad5b13..aba32e6635 100644
--- a/src/interfaces/libpq/libpq-fe.h
+++ b/src/interfaces/libpq/libpq-fe.h
@@ -619,12 +619,23 @@ extern int	pg_valid_server_encoding_id(int encoding);
 
 /* === in fe-secure-openssl.c === */
 
-/* Support for overriding sslpassword handling with a callback. */
+/* Support for overriding sslpassword handling with a callback */
 typedef int (*PQsslKeyPassHook_OpenSSL_type) (char *buf, int size, PGconn *conn);
 extern PQsslKeyPassHook_OpenSSL_type PQgetSSLKeyPassHook_OpenSSL(void);
 extern void PQsetSSLKeyPassHook_OpenSSL(PQsslKeyPassHook_OpenSSL_type hook);
 extern int	PQdefaultSSLKeyPassHook_OpenSSL(char *buf, int size, PGconn *conn);
 
+/* == in fe-secure-nss.c === */
+typedef struct PK11SlotInfoStr PK11SlotInfo;
+typedef int PRIntn;
+typedef PRIntn PRBool;
+
+/* Support for overriding sslpassword handling with a callback */
+typedef char *(*PQsslKeyPassHook_nss_type) (PK11SlotInfo *slot, PRBool retry, void *arg);
+extern PQsslKeyPassHook_nss_type PQgetSSLKeyPassHook_nss(void);
+extern void PQsetSSLKeyPassHook_nss(PQsslKeyPassHook_nss_type hook);
+extern char *PQdefaultSSLKeyPassHook_nss(PK11SlotInfo *slot, PRBool retry, void *arg);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/src/interfaces/libpq/libpq-int.h b/src/interfaces/libpq/libpq-int.h
index 4db498369c..a95450fbba 100644
--- a/src/interfaces/libpq/libpq-int.h
+++ b/src/interfaces/libpq/libpq-int.h
@@ -362,6 +362,7 @@ struct pg_conn
 	char	   *sslpassword;	/* client key file password */
 	char	   *sslrootcert;	/* root certificate filename */
 	char	   *sslcrl;			/* certificate revocation list filename */
+	char	   *cert_database;	/* NSS certificate/key database */
 	char	   *requirepeer;	/* required peer credentials for local sockets */
 	char	   *gssencmode;		/* GSS mode (require,prefer,disable) */
 	char	   *krbsrvname;		/* Kerberos service name */
@@ -485,6 +486,23 @@ struct pg_conn
 								 * OpenSSL version changes */
 #endif
 #endif							/* USE_OPENSSL */
+
+#ifdef USE_NSS
+	void	   *pr_fd;			/* NSPR file descriptor for the connection */
+
+	/*
+	 * Track whether the NSS database has a password set or not. There is no
+	 * API function for retrieving password status of a database, but we need
+	 * to know since some NSS API calls require the password passed in (they
+	 * don't call the callback themselves). To track, we simply flip this to
+	 * true in case NSS invoked the password callback - as that will only
+	 * happen in case there is a password. The reason for tracking this is
+	 * that there are calls which require a password parameter, but doesn't
+	 * use the callbacks provided, so we must call the callback on behalf of
+	 * these.
+	 */
+	bool		has_password;
+#endif							/* USE_NSS */
 #endif							/* USE_SSL */
 
 #ifdef ENABLE_GSS
@@ -759,7 +777,7 @@ extern ssize_t pgtls_write(PGconn *conn, const void *ptr, size_t len);
  * This is not supported with old versions of OpenSSL that don't have
  * the X509_get_signature_nid() function.
  */
-#if defined(USE_OPENSSL) && defined(HAVE_X509_GET_SIGNATURE_NID)
+#if defined(USE_NSS) || (defined(USE_OPENSSL) && defined(HAVE_X509_GET_SIGNATURE_NID))
 #define HAVE_PGTLS_GET_PEER_CERTIFICATE_HASH
 extern char *pgtls_get_peer_certificate_hash(PGconn *conn, size_t *len);
 #endif
diff --git a/src/tools/msvc/Mkvcbuild.pm b/src/tools/msvc/Mkvcbuild.pm
index 5634b2d40c..a21eb088b3 100644
--- a/src/tools/msvc/Mkvcbuild.pm
+++ b/src/tools/msvc/Mkvcbuild.pm
@@ -194,12 +194,19 @@ sub mkvcbuild
 	$postgres->FullExportDLL('postgres.lib');
 
 	# The OBJS scraper doesn't know about ifdefs, so remove appropriate files
-	# if building without OpenSSL.
-	if (!$solution->{options}->{openssl})
+	# if building without various options.
+	if (!$solution->{options}->{openssl} && !$solution->{options}->{nss})
 	{
 		$postgres->RemoveFile('src/backend/libpq/be-secure-common.c');
+	}
+	if (!$solution->{options}->{openssl})
+	{
 		$postgres->RemoveFile('src/backend/libpq/be-secure-openssl.c');
 	}
+	if (!$solution->{options}->{nss})
+	{
+		$postgres->RemoveFile('src/backend/libpq/be-secure-nss.c');
+	}
 	if (!$solution->{options}->{gss})
 	{
 		$postgres->RemoveFile('src/backend/libpq/be-gssapi-common.c');
@@ -257,12 +264,19 @@ sub mkvcbuild
 	$libpq->AddReference($libpgcommon, $libpgport);
 
 	# The OBJS scraper doesn't know about ifdefs, so remove appropriate files
-	# if building without OpenSSL.
-	if (!$solution->{options}->{openssl})
+	# if building without various options
+	if (!$solution->{options}->{openssl} && !$solution->{options}->{nss})
 	{
 		$libpq->RemoveFile('src/interfaces/libpq/fe-secure-common.c');
+	}
+	if (!$solution->{options}->{openssl})
+	{
 		$libpq->RemoveFile('src/interfaces/libpq/fe-secure-openssl.c');
 	}
+	if (!$solution->{options}->{nss})
+	{
+		$libpq->RemoveFile('src/interfaces/libpq/fe-secure-nss.c');
+	}
 	if (!$solution->{options}->{gss})
 	{
 		$libpq->RemoveFile('src/interfaces/libpq/fe-gssapi-common.c');
diff --git a/src/tools/msvc/Solution.pm b/src/tools/msvc/Solution.pm
index 59a42bea97..d3d0ea3c95 100644
--- a/src/tools/msvc/Solution.pm
+++ b/src/tools/msvc/Solution.pm
@@ -488,6 +488,7 @@ sub GenerateFiles
 		USE_LLVM                   => undef,
 		USE_NAMED_POSIX_SEMAPHORES => undef,
 		USE_OPENSSL                => undef,
+		USE_NSS                    => undef,
 		USE_PAM                    => undef,
 		USE_SLICING_BY_8_CRC32C    => undef,
 		USE_SSE42_CRC32C           => undef,
@@ -540,6 +541,10 @@ sub GenerateFiles
 			$define{HAVE_OPENSSL_INIT_SSL}      = 1;
 		}
 	}
+	if ($self->{options}->{nss})
+	{
+		$define{USE_NSS} = 1;
+	}
 
 	$self->GenerateConfigHeader('src/include/pg_config.h',     \%define, 1);
 	$self->GenerateConfigHeader('src/include/pg_config_ext.h', \%define, 0);
@@ -1005,6 +1010,21 @@ sub AddProject
 			}
 		}
 	}
+	if ($self->{options}->{nss})
+	{
+		$proj->AddIncludeDir($self->{options}->{nss} . '\..\public\nss');
+		$proj->AddIncludeDir($self->{options}->{nss} . '\include\nspr');
+		foreach my $lib (qw(plds4 plc4 nspr4))
+		{
+			$proj->AddLibrary($self->{options}->{nss} .
+							  '\lib\lib' . "$lib.lib", 0);
+		}
+		foreach my $lib (qw(ssl3 smime3 nss3))
+		{
+			$proj->AddLibrary($self->{options}->{nss} .
+							  '\lib' . "\\$lib.dll.lib", 0);
+		}
+	}
 	if ($self->{options}->{nls})
 	{
 		$proj->AddIncludeDir($self->{options}->{nls} . '\include');
diff --git a/src/tools/msvc/config_default.pl b/src/tools/msvc/config_default.pl
index 2ef2cfc4e9..49dc4d5864 100644
--- a/src/tools/msvc/config_default.pl
+++ b/src/tools/msvc/config_default.pl
@@ -17,6 +17,7 @@ our $config = {
 	perl      => undef,    # --with-perl=<path>
 	python    => undef,    # --with-python=<path>
 	openssl   => undef,    # --with-openssl=<path>
+	nss       => undef,    # --with-nss=<path>
 	uuid      => undef,    # --with-uuid=<path>
 	xml       => undef,    # --with-libxml=<path>
 	xslt      => undef,    # --with-libxslt=<path>
-- 
2.21.1 (Apple Git-122.3)

From 28d9aa2c124cfffcfa3640e09aaba81ff5dc60dd Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Wed, 28 Oct 2020 11:22:26 +0100
Subject: [PATCH v21 2/6] NSS Testharness updates

TODO:
	* Generate certificate/keys with NSS tooling for NSS specific test
	* Add test for certificate with embedded nulls
	* Fix SCRAM tests when channel binding works
---
 src/test/Makefile                             |   2 +-
 src/test/modules/Makefile                     |   2 +-
 .../modules/ssl_passphrase_callback/Makefile  |   2 +-
 .../ssl_passphrase_callback/t/001_testfunc.pl |   4 +-
 src/test/ssl/Makefile                         | 235 +++++++++++-
 src/test/ssl/t/001_ssltests.pl                | 346 +++++++++++-------
 src/test/ssl/t/002_scram.pl                   |  97 +++--
 src/test/ssl/t/SSL/Backend/NSS.pm             |  73 ++++
 src/test/ssl/t/SSL/Backend/OpenSSL.pm         | 103 ++++++
 .../ssl/t/{SSLServer.pm => SSL/Server.pm}     |  80 +++-
 10 files changed, 749 insertions(+), 195 deletions(-)
 create mode 100644 src/test/ssl/t/SSL/Backend/NSS.pm
 create mode 100644 src/test/ssl/t/SSL/Backend/OpenSSL.pm
 rename src/test/ssl/t/{SSLServer.pm => SSL/Server.pm} (78%)

diff --git a/src/test/Makefile b/src/test/Makefile
index ab1ef9a475..cee4586eb5 100644
--- a/src/test/Makefile
+++ b/src/test/Makefile
@@ -28,7 +28,7 @@ ifneq (,$(filter ldap,$(PG_TEST_EXTRA)))
 SUBDIRS += ldap
 endif
 endif
-ifeq ($(with_openssl),yes)
+ifeq ($(with_ssl),yes)
 ifneq (,$(filter ssl,$(PG_TEST_EXTRA)))
 SUBDIRS += ssl
 endif
diff --git a/src/test/modules/Makefile b/src/test/modules/Makefile
index 59921b46cf..5391f461a2 100644
--- a/src/test/modules/Makefile
+++ b/src/test/modules/Makefile
@@ -28,7 +28,7 @@ SUBDIRS = \
 		  unsafe_tests \
 		  worker_spi
 
-ifeq ($(with_openssl),yes)
+ifeq ($(with_ssl),openssl)
 SUBDIRS += ssl_passphrase_callback
 else
 ALWAYS_SUBDIRS += ssl_passphrase_callback
diff --git a/src/test/modules/ssl_passphrase_callback/Makefile b/src/test/modules/ssl_passphrase_callback/Makefile
index f81265c296..a34d7ea46a 100644
--- a/src/test/modules/ssl_passphrase_callback/Makefile
+++ b/src/test/modules/ssl_passphrase_callback/Makefile
@@ -1,6 +1,6 @@
 # ssl_passphrase_callback Makefile
 
-export with_openssl
+export with_ssl
 
 MODULE_big = ssl_passphrase_func
 OBJS = ssl_passphrase_func.o $(WIN32RES)
diff --git a/src/test/modules/ssl_passphrase_callback/t/001_testfunc.pl b/src/test/modules/ssl_passphrase_callback/t/001_testfunc.pl
index dbc084f870..a2bed5336c 100644
--- a/src/test/modules/ssl_passphrase_callback/t/001_testfunc.pl
+++ b/src/test/modules/ssl_passphrase_callback/t/001_testfunc.pl
@@ -7,9 +7,9 @@ use TestLib;
 use Test::More;
 use PostgresNode;
 
-unless (($ENV{with_openssl} || 'no') eq 'yes')
+unless ($ENV{with_ssl} eq 'openssl')
 {
-	plan skip_all => 'SSL not supported by this build';
+	plan skip_all => 'OpenSSL not supported by this build';
 }
 
 my $clearpass = "FooBaR1";
diff --git a/src/test/ssl/Makefile b/src/test/ssl/Makefile
index 93335b1ea2..e32b0f89d5 100644
--- a/src/test/ssl/Makefile
+++ b/src/test/ssl/Makefile
@@ -13,7 +13,7 @@ subdir = src/test/ssl
 top_builddir = ../../..
 include $(top_builddir)/src/Makefile.global
 
-export with_openssl
+export with_ssl
 
 CERTIFICATES := server_ca server-cn-and-alt-names \
 	server-cn-only server-single-alt-name server-multiple-alt-names \
@@ -30,6 +30,35 @@ SSLFILES := $(CERTIFICATES:%=ssl/%.key) $(CERTIFICATES:%=ssl/%.crt) \
 	ssl/client+client_ca.crt ssl/client-der.key \
 	ssl/client-encrypted-pem.key ssl/client-encrypted-der.key
 
+# Even though we in practice could get away with far fewer NSS databases, they
+# are generated to mimic the setup for the OpenSSL tests in order to ensure
+# we isolate the same behavior between the backends. The database name should
+# contain the files included for easier test suite code reading.
+NSSFILES := ssl/nss/client_ca.crt.db \
+	ssl/nss/server_ca.crt.db \
+	ssl/nss/root+server_ca.crt.db \
+	ssl/nss/root+client_ca.crt.db \
+	ssl/nss/client.crt__client.key.db \
+	ssl/nss/client-revoked.crt__client-revoked.key.db \
+	ssl/nss/server-cn-only.crt__server-password.key.db \
+	ssl/nss/server-cn-only.crt__server-cn-only.key.db \
+	ssl/nss/root.crl \
+	ssl/nss/server.crl \
+	ssl/nss/client.crl \
+	ssl/nss/server-multiple-alt-names.crt__server-multiple-alt-names.key.db \
+	ssl/nss/server-single-alt-name.crt__server-single-alt-name.key.db \
+	ssl/nss/server-cn-and-alt-names.crt__server-cn-and-alt-names.key.db \
+	ssl/nss/server-no-names.crt__server-no-names.key.db \
+	ssl/nss/server-revoked.crt__server-revoked.key.db \
+	ssl/nss/root+client.crl \
+	ssl/nss/client+client_ca.crt__client.key.db \
+	ssl/nss/client.crt__client-encrypted-pem.key.db \
+	ssl/nss/root+server_ca.crt__server.crl.db \
+	ssl/nss/root+server_ca.crt__root+server.crl.db \
+	ssl/nss/native_ca-root.db \
+	ssl/nss/native_server-root.db \
+	ssl/nss/native_client-root.db
+
 # This target re-generates all the key and certificate files. Usually we just
 # use the ones that are committed to the tree without rebuilding them.
 #
@@ -37,6 +66,10 @@ SSLFILES := $(CERTIFICATES:%=ssl/%.key) $(CERTIFICATES:%=ssl/%.crt) \
 #
 sslfiles: $(SSLFILES)
 
+# Generate NSS certificate databases corresponding to the OpenSSL certificates.
+# This target will fail unless preceded by nssfiles-clean.
+nssfiles: $(NSSFILES)
+
 # OpenSSL requires a directory to put all generated certificates in. We don't
 # use this for anything, but we need a location.
 ssl/new_certs_dir:
@@ -64,6 +97,24 @@ ssl/%_ca.crt: ssl/%_ca.key %_ca.config ssl/root_ca.crt ssl/new_certs_dir
 	rm ssl/temp_ca.crt ssl/temp_ca_signed.crt
 	echo "01" > ssl/$*_ca.srl
 
+ssl/nss/%_ca.crt.db: ssl/%_ca.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n $*_ca.crt -i ssl/$*_ca.crt -t "CT,C,C"
+
+ssl/nss/root+server_ca.crt__server.crl.db: ssl/root+server_ca.crt ssl/nss/server.crl
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	crlutil -I -i ssl/nss/server.crl -d $@ -B
+
+ssl/nss/root+server_ca.crt__root+server.crl.db: ssl/root+server_ca.crt ssl/nss/root.crl ssl/nss/server.crl
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	crlutil -I -i ssl/nss/root.crl -d $@ -B
+	crlutil -I -i ssl/nss/server.crl -d $@ -B
+
 # Server certificates, signed by server CA:
 ssl/server-%.crt: ssl/server-%.key ssl/server_ca.crt server-%.config
 	openssl req -new -key ssl/server-$*.key -out ssl/server-$*.csr -config server-$*.config
@@ -77,6 +128,78 @@ ssl/server-ss.crt: ssl/server-cn-only.key ssl/server-cn-only.crt server-cn-only.
 	openssl x509 -req -days 10000 -in ssl/server-ss.csr -signkey ssl/server-cn-only.key -out ssl/server-ss.crt  -extensions v3_req -extfile server-cn-only.config
 	rm ssl/server-ss.csr
 
+# pk12util won't preserve the password when importing the password protected
+# key, the password must be set on the database *before* importing it as the
+# password in the pkcs12 envelope will be dropped.
+ssl/nss/server-cn-only.crt__server-password.key.db: ssl/server-cn-only.crt
+	$(MKDIR_P) $@
+	echo "secret1" > password.txt
+	certutil -d "sql:$@" -N -f password.txt
+	certutil -d "sql:$@" -A -n ssl/server-cn-only.crt -i ssl/server-cn-only.crt -t "CT,C,C" -f password.txt
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C" -f password.txt
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C" -f password.txt
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C" -f password.txt
+	openssl pkcs12 -export -out ssl/nss/server-password.pfx -inkey ssl/server-password.key -in ssl/server-cn-only.crt -certfile ssl/server_ca.crt -passin 'pass:secret1' -passout 'pass:secret1'
+	pk12util -i ssl/nss/server-password.pfx -d "sql:$@" -W 'secret1' -K 'secret1'
+
+ssl/nss/server-cn-only.crt__server-cn-only.key.db: ssl/server-cn-only.crt ssl/server-cn-only.key
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-cn-only.crt -i ssl/server-cn-only.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-cn-only.pfx -inkey ssl/server-cn-only.key -in ssl/server-cn-only.crt -certfile ssl/server_ca.crt -passout pass:
+	pk12util -i ssl/nss/server-cn-only.pfx -d "sql:$@" -W ''
+
+ssl/nss/server-multiple-alt-names.crt__server-multiple-alt-names.key.db: ssl/server-multiple-alt-names.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-multiple-alt-names.crt -i ssl/server-multiple-alt-names.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-multiple-alt-names.pfx -inkey ssl/server-multiple-alt-names.key -in ssl/server-multiple-alt-names.crt -certfile ssl/server-multiple-alt-names.crt -passout pass:
+	pk12util -i ssl/nss/server-multiple-alt-names.pfx -d "sql:$@" -W ''
+
+ssl/nss/server-single-alt-name.crt__server-single-alt-name.key.db: ssl/server-single-alt-name.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-single-alt-name.crt -i ssl/server-single-alt-name.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-single-alt-name.pfx -inkey ssl/server-single-alt-name.key -in ssl/server-single-alt-name.crt -certfile ssl/server-single-alt-name.crt -passout pass:
+	pk12util -i ssl/nss/server-single-alt-name.pfx -d "sql:$@" -W ''
+
+ssl/nss/server-cn-and-alt-names.crt__server-cn-and-alt-names.key.db: ssl/server-cn-and-alt-names.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-cn-and-alt-names.crt -i ssl/server-cn-and-alt-names.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-cn-and-alt-names.pfx -inkey ssl/server-cn-and-alt-names.key -in ssl/server-cn-and-alt-names.crt -certfile ssl/server-cn-and-alt-names.crt -passout pass:
+	pk12util -i ssl/nss/server-cn-and-alt-names.pfx -d $@ -W ''
+
+ssl/nss/server-no-names.crt__server-no-names.key.db: ssl/server-no-names.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-no-names.crt -i ssl/server-no-names.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-no-names.pfx -inkey ssl/server-no-names.key -in ssl/server-no-names.crt -certfile ssl/server-no-names.crt -passout pass:
+	pk12util -i ssl/nss/server-no-names.pfx -d "sql:$@" -W ''
+
+ssl/nss/server-revoked.crt__server-revoked.key.db: ssl/server-revoked.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-revoked.crt -i ssl/server-revoked.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-revoked.pfx -inkey ssl/server-revoked.key -in ssl/server-revoked.crt -certfile ssl/server-revoked.crt -passout pass:
+	pk12util -i ssl/nss/server-revoked.pfx -d "sql:$@" -W ''
+
 # Password-protected version of server-cn-only.key
 ssl/server-password.key: ssl/server-cn-only.key
 	openssl rsa -aes256 -in $< -out $@ -passout 'pass:secret1'
@@ -88,6 +211,27 @@ ssl/client.crt: ssl/client.key ssl/client_ca.crt
 	openssl x509 -in ssl/temp.crt -out ssl/client.crt # to keep just the PEM cert
 	rm ssl/client.csr ssl/temp.crt
 
+# Client certificate, signed by client CA
+ssl/nss/client.crt__client.key.db: ssl/client.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/client.crt -i ssl/client.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root+client_ca.crt -i ssl/root+client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client.pfx -inkey ssl/client.key -in ssl/client.crt -certfile ssl/client_ca.crt -passout pass:
+	pk12util -i ssl/nss/client.pfx -d "sql:$@" -W ''
+
+# Client certificate with encrypted key, signed by client CA
+ssl/nss/client.crt__client-encrypted-pem.key.db: ssl/client.crt
+	$(MKDIR_P) $@
+	echo 'dUmmyP^#+' > $@.pass
+	certutil -d "sql:$@" -N -f $@.pass
+	certutil -d "sql:$@" -A -f $@.pass -n ssl/client.crt -i ssl/client.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -f $@.pass -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -f $@.pass -n root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client-encrypted-pem.pfx -inkey ssl/client-encrypted-pem.key -in ssl/client.crt -certfile ssl/client_ca.crt -passin pass:'dUmmyP^#+' -passout pass:'dUmmyP^#+'
+	pk12util -i ssl/nss/client-encrypted-pem.pfx -d "sql:$@" -W 'dUmmyP^#+' -k $@.pass
+
 # Another client certificate, signed by the client CA. This one is revoked.
 ssl/client-revoked.crt: ssl/client-revoked.key ssl/client_ca.crt client.config
 	openssl req -new -key ssl/client-revoked.key -out ssl/client-revoked.csr -config client.config
@@ -95,6 +239,14 @@ ssl/client-revoked.crt: ssl/client-revoked.key ssl/client_ca.crt client.config
 	openssl x509 -in ssl/temp.crt -out ssl/client-revoked.crt # to keep just the PEM cert
 	rm ssl/client-revoked.csr ssl/temp.crt
 
+ssl/nss/client-revoked.crt__client-revoked.key.db: ssl/client-revoked.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/client-revoked.crt -i ssl/client-revoked.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client-revoked.pfx -inkey ssl/client-revoked.key -in ssl/client-revoked.crt -certfile ssl/client_ca.crt -passout pass:
+	pk12util -i ssl/nss/client-revoked.pfx -d "sql:$@" -W ''
+
 # Convert the key to DER, to test our behaviour there too
 ssl/client-der.key: ssl/client.key
 	openssl rsa -in ssl/client.key -outform DER -out ssl/client-der.key
@@ -127,19 +279,40 @@ ssl/root+client_ca.crt: ssl/root_ca.crt ssl/client_ca.crt
 ssl/client+client_ca.crt: ssl/client.crt ssl/client_ca.crt
 	cat $^ > $@
 
+# Client certificate, signed by client CA
+ssl/nss/client+client_ca.crt__client.key.db: ssl/client+client_ca.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/client+client_ca.crt -i ssl/client+client_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n ssl/root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client.pfx -inkey ssl/client.key -in ssl/client.crt -certfile ssl/client_ca.crt -passout pass:
+	pk12util -i ssl/nss/client.pfx -d "sql:$@" -W ''
+
 #### CRLs
 
 ssl/client.crl: ssl/client-revoked.crt
 	openssl ca -config cas.config -name client_ca -revoke ssl/client-revoked.crt
 	openssl ca -config cas.config -name client_ca -gencrl -out ssl/client.crl
 
+ssl/nss/client.crl: ssl/client.crl
+	openssl crl -in $^ -outform der -out $@
+
 ssl/server.crl: ssl/server-revoked.crt
 	openssl ca -config cas.config -name server_ca -revoke ssl/server-revoked.crt
 	openssl ca -config cas.config -name server_ca -gencrl -out ssl/server.crl
 
+ssl/nss/server.crl: ssl/server.crl
+	openssl crl -in $^ -outform der -out $@
+
 ssl/root.crl: ssl/root_ca.crt
 	openssl ca -config cas.config -name root_ca -gencrl -out ssl/root.crl
 
+ssl/nss/root.crl: ssl/root.crl
+	openssl crl -in $^ -outform der -out $@
+
+ssl/nss/root+client.crl: ssl/root+client.crl
+	openssl crl -in $^ -outform der -out $@
+
 # If a CRL is used, OpenSSL requires a CRL file for *all* the CAs in the
 # chain, even if some of them are empty.
 ssl/root+server.crl: ssl/root.crl ssl/server.crl
@@ -147,13 +320,73 @@ ssl/root+server.crl: ssl/root.crl ssl/server.crl
 ssl/root+client.crl: ssl/root.crl ssl/client.crl
 	cat $^ > $@
 
+#### NSS specific certificates and keys
+
+#NSSFILES2 := ssl/nss/native_ca-root.db \
+#	ssl/nss/native_server-root.db \
+#	ssl/nss/native_client-root.db
+
+#nssfiles2: $(NSSFILES2)
+
+ssl/nss/native_ca-%.db:
+	$(MKDIR_P) ssl/nss/native_ca-$*.db
+	certutil -N -d "sql:ssl/nss/native_ca-$*.db/" --empty-password
+	echo y > nss_ca_params.txt
+	echo 10 >> nss_ca_params.txt
+	echo y >> nss_ca_params.txt
+	cat nss_ca_params.txt | certutil -S -d "sql:ssl/nss/native_ca-$*.db/" -n ca-$* \
+	-s "CN=Test CA for PostgreSQL SSL regression tests,OU=PostgreSQL test suite" \
+	-x -k rsa -g 2048 -m 5432 -t CTu,CTu,CTu \
+	--keyUsage certSigning -2 --nsCertType sslCA,smimeCA,objectSigningCA \
+	-z Makefile -Z SHA256
+	rm nss_ca_params.txt
+
+ssl/nss/native_ca-%.pem: ssl/nss/native_ca-%.db
+	certutil -L -d "sql:ssl/nss/native_ca-$*.db/" -n ca-$* -a > ssl/nss/native_ca-$*.pem
+
+# Create and sign a server certificate
+ssl/nss/native_server-%.db: ssl/nss/native_ca-%.pem
+	$(MKDIR_P) ssl/nss/native_server-$*.db
+	certutil -N -d "sql:ssl/nss/native_server-$*.db/" --empty-password
+	certutil -R -d "sql:ssl/nss/native_server-$*.db/" \
+		-s "CN=common-name.pg-ssltest.test,OU=PostgreSQL test suite" \
+		-o ssl/nss/native_server-$*.csr -g 2048 -Z SHA256 -z Makefile
+	echo 1 > nss_server_params.txt
+	echo 9 >> nss_server_params.txt
+	cat nss_server_params.txt | certutil -C -d "sql:ssl/nss/native_ca-$*.db/" -c ca-root -i ssl/nss/native_server-$*.csr \
+		-o ssl/nss/native_server_$*.der -m 5433 --keyUsage keyEncipherment \
+		--nsCertType sslServer --certVersion 1 -Z SHA256
+	certutil -A -d "sql:ssl/nss/native_server-$*.db/" -n ca-$* -t CTu,CTu,CTu -a -i ssl/nss/native_ca-$*.pem
+	certutil -A -d "sql:ssl/nss/native_server-$*.db/" -n ssl/native_server-$*.crt -t CTu,CTu,CTu -i ssl/nss/native_server_$*.der
+	rm nss_server_params.txt
+
+# Create and sign a client certificate
+ssl/nss/native_client-%.db: ssl/nss/native_ca-%.pem
+	$(MKDIR_P) ssl/nss/native_client-$*.db
+	certutil -N -d "sql:ssl/nss/native_client-$*.db/" --empty-password
+	certutil -R -d "sql:ssl/nss/native_client-$*.db/" -s "CN=ssltestuser,OU=PostgreSQL test suite" \
+		-o ssl/nss/native_client-$*.csr -g 2048 -Z SHA256 -z Makefile
+	certutil -C -d "sql:ssl/nss/native_ca-$*.db/" -c ca-$* -i ssl/nss/native_client-$*.csr -o ssl/nss/native_client-$*.der \
+		-m 5434 --keyUsage keyEncipherment,digitalSignature --nsCertType sslClient \
+		--certVersion 1 -Z SHA256
+	certutil -A -d "sql:ssl/nss/native_client-$*.db" -n ca-$* -t CTu,CTu,CTu -a -i ssl/nss/native_ca-$*.pem
+	certutil -A -d "sql:ssl/nss/native_client-$*.db" -n native_client-$* -t CTu,CTu,CTu -i ssl/nss/native_client-$*.der
+
+nssfiles2clean:
+	rm -rf ssl/nss
+
 .PHONY: sslfiles-clean
 sslfiles-clean:
 	rm -f $(SSLFILES) ssl/client_ca.srl ssl/server_ca.srl ssl/client_ca-certindex* ssl/server_ca-certindex* ssl/root_ca-certindex* ssl/root_ca.srl ssl/temp_ca.crt ssl/temp_ca_signed.crt
 
+.PHONY: nssfiles-clean
+nssfiles-clean:
+	rm -rf ssl/nss
+
 clean distclean maintainer-clean:
 	rm -rf tmp_check
 	rm -rf ssl/*.old ssl/new_certs_dir ssl/client*_tmp.key
+	rm -rf ssl/nss
 
 # Doesn't depend on $(SSLFILES) because we don't rebuild them by default
 check:
diff --git a/src/test/ssl/t/001_ssltests.pl b/src/test/ssl/t/001_ssltests.pl
index fd2727b568..6b8bca2846 100644
--- a/src/test/ssl/t/001_ssltests.pl
+++ b/src/test/ssl/t/001_ssltests.pl
@@ -4,17 +4,24 @@ use PostgresNode;
 use TestLib;
 use Test::More;
 
-use File::Copy;
-
 use FindBin;
 use lib $FindBin::RealBin;
 
-use SSLServer;
+use SSL::Server;
+
+my $openssl;
+my $nss;
 
-if ($ENV{with_openssl} eq 'yes')
+if ($ENV{with_ssl} eq 'openssl')
 {
+	$openssl = 1;
 	plan tests => 93;
 }
+elsif ($ENV{with_ssl} eq 'nss')
+{
+	$nss = 1;
+	plan tests => 99;
+}
 else
 {
 	plan skip_all => 'SSL not supported by this build';
@@ -32,32 +39,6 @@ my $SERVERHOSTCIDR = '127.0.0.1/32';
 # Allocation of base connection string shared among multiple tests.
 my $common_connstr;
 
-# The client's private key must not be world-readable, so take a copy
-# of the key stored in the code tree and update its permissions.
-#
-# This changes ssl/client.key to ssl/client_tmp.key etc for the rest
-# of the tests.
-my @keys = (
-	"client",     "client-revoked",
-	"client-der", "client-encrypted-pem",
-	"client-encrypted-der");
-foreach my $key (@keys)
-{
-	copy("ssl/${key}.key", "ssl/${key}_tmp.key")
-	  or die
-	  "couldn't copy ssl/${key}.key to ssl/${key}_tmp.key for permissions change: $!";
-	chmod 0600, "ssl/${key}_tmp.key"
-	  or die "failed to change permissions on ssl/${key}_tmp.key: $!";
-}
-
-# Also make a copy of that explicitly world-readable.  We can't
-# necessarily rely on the file in the source tree having those
-# permissions.  Add it to @keys to include it in the final clean
-# up phase.
-copy("ssl/client.key", "ssl/client_wrongperms_tmp.key");
-chmod 0644, "ssl/client_wrongperms_tmp.key";
-push @keys, 'client_wrongperms';
-
 #### Set up the server.
 
 note "setting up data directory";
@@ -72,36 +53,65 @@ $node->start;
 
 # Run this before we lock down access below.
 my $result = $node->safe_psql('postgres', "SHOW ssl_library");
-is($result, 'OpenSSL', 'ssl_library parameter');
+is($result, SSL::Server::ssl_library(), 'ssl_library parameter');
 
 configure_test_server_for_ssl($node, $SERVERHOSTADDR, $SERVERHOSTCIDR,
 	'trust');
 
 note "testing password-protected keys";
 
-open my $sslconf, '>', $node->data_dir . "/sslconfig.conf";
-print $sslconf "ssl=on\n";
-print $sslconf "ssl_cert_file='server-cn-only.crt'\n";
-print $sslconf "ssl_key_file='server-password.key'\n";
-print $sslconf "ssl_passphrase_command='echo wrongpassword'\n";
-close $sslconf;
+# Since the passphrase callbacks operate at different stages in OpenSSL and
+# NSS we have two separate blocks for them.
+SKIP:
+{
+	skip "Certificate passphrases aren't checked on server restart in NSS", 2
+	  if ($nss);
+
+	set_server_cert($node, 'server-cn-only', 'root+client_ca',
+					   'server-password', 'echo wrongpassword');
+	command_fails(
+		[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
+		'restart fails with password-protected key file with wrong password');
+	$node->_update_pid(0);
+
+	set_server_cert($node, 'server-cn-only', 'root+client_ca',
+					'server-password', 'echo secret1');
+	command_ok(
+		[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
+		'restart succeeds with password-protected key file');
+	$node->_update_pid(1);
+}
 
-command_fails(
-	[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
-	'restart fails with password-protected key file with wrong password');
-$node->_update_pid(0);
+SKIP:
+{
+	skip "Certificate passphrases are checked on connection in NSS", 5
+	  if ($openssl);
 
-open $sslconf, '>', $node->data_dir . "/sslconfig.conf";
-print $sslconf "ssl=on\n";
-print $sslconf "ssl_cert_file='server-cn-only.crt'\n";
-print $sslconf "ssl_key_file='server-password.key'\n";
-print $sslconf "ssl_passphrase_command='echo secret1'\n";
-close $sslconf;
+	set_server_cert($node, 'server-cn-only', 'root+client_ca',
+					   'server-password', 'echo wrongpassword');
+	command_ok(
+		[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
+		'restart fails with password-protected key file with wrong password');
+	$node->_update_pid(1);
 
-command_ok(
-	[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
-	'restart succeeds with password-protected key file');
-$node->_update_pid(1);
+	test_connect_fails(
+		"user=ssltestuser dbname=trustdb sslcert=invalid hostaddr=$SERVERHOSTADDR host=common-name.pg-ssltest.test",
+		"sslrootcert=invalid sslmode=require",
+		qr/\QSSL error\E/,
+		"connect to server with incorrect key password configured");
+
+	set_server_cert($node, 'server-cn-only', 'root+client_ca',
+					   'server-password', 'echo secret1');
+	command_ok(
+		[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
+		'restart fails with password-protected key file with wrong password');
+	$node->_update_pid(1);
+
+	test_connect_ok(
+		"user=ssltestuser dbname=trustdb sslcert=invalid hostaddr=$SERVERHOSTADDR host=common-name.pg-ssltest.test",
+		"sslrootcert=invalid sslmode=require",
+		"connect to server with correct key password configured");
+}
 
 # Test compatibility of SSL protocols.
 # TLSv1.1 is lower than TLSv1.2, so it won't work.
@@ -149,82 +159,105 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"sslrootcert=invalid sslmode=verify-ca",
-	qr/root certificate file "invalid" does not exist/,
+	qr/root certificate file "invalid" does not exist|Peer's Certificate issuer is not recognized/,
 	"connect without server root cert sslmode=verify-ca");
 test_connect_fails(
 	$common_connstr,
 	"sslrootcert=invalid sslmode=verify-full",
-	qr/root certificate file "invalid" does not exist/,
+	qr/root certificate file "invalid" does not exist|Peer's Certificate issuer is not recognized/,
 	"connect without server root cert sslmode=verify-full");
 
 # Try with wrong root cert, should fail. (We're using the client CA as the
 # root, but the server's key is signed by the server CA.)
-test_connect_fails($common_connstr,
-	"sslrootcert=ssl/client_ca.crt sslmode=require",
-	qr/SSL error/, "connect with wrong server root cert sslmode=require");
-test_connect_fails($common_connstr,
-	"sslrootcert=ssl/client_ca.crt sslmode=verify-ca",
-	qr/SSL error/, "connect with wrong server root cert sslmode=verify-ca");
-test_connect_fails($common_connstr,
-	"sslrootcert=ssl/client_ca.crt sslmode=verify-full",
-	qr/SSL error/, "connect with wrong server root cert sslmode=verify-full");
-
-# Try with just the server CA's cert. This fails because the root file
-# must contain the whole chain up to the root CA.
-test_connect_fails($common_connstr,
-	"sslrootcert=ssl/server_ca.crt sslmode=verify-ca",
-	qr/SSL error/, "connect with server CA cert, without root CA");
+test_connect_fails(
+	$common_connstr,
+	"sslrootcert=ssl/client_ca.crt sslmode=require cert_database=ssl/nss/client_ca.crt.db",
+	qr/SSL error/,
+	"connect with wrong server root cert sslmode=require");
+test_connect_fails(
+	$common_connstr,
+	"sslrootcert=ssl/client_ca.crt sslmode=verify-ca cert_database=ssl/nss/client_ca.crt.db",
+	qr/SSL error/,
+	"connect with wrong server root cert sslmode=verify-ca");
+test_connect_fails(
+	$common_connstr,
+	"sslrootcert=ssl/client_ca.crt sslmode=verify-full cert_database=ssl/nss/client_ca.crt.db",
+	qr/SSL error/,
+	"connect with wrong server root cert sslmode=verify-full");
+
+SKIP:
+{
+	# NSS supports partial chain validation, so this test doesn't work there.
+	# This is similar to the OpenSSL option X509_V_FLAG_PARTIAL_CHAIN which
+	# we don't allow.
+	skip "NSS support partial chain validation", 2 if ($nss);
+	# Try with just the server CA's cert. This fails because the root file
+	# must contain the whole chain up to the root CA.
+	test_connect_fails($common_connstr,
+		"sslrootcert=ssl/server_ca.crt sslmode=verify-ca",
+		qr/SSL error/, "connect with server CA cert, without root CA");
+}
 
 # And finally, with the correct root cert.
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require cert_database=ssl/nss/root+server_ca.crt.db",
 	"connect with correct server CA cert file sslmode=require");
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca cert_database=ssl/nss/root+server_ca.crt.db",
 	"connect with correct server CA cert file sslmode=verify-ca");
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-full",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db",
 	"connect with correct server CA cert file sslmode=verify-full");
 
-# Test with cert root file that contains two certificates. The client should
-# be able to pick the right one, regardless of the order in the file.
-test_connect_ok(
-	$common_connstr,
-	"sslrootcert=ssl/both-cas-1.crt sslmode=verify-ca",
-	"cert root file that contains two certificates, order 1");
-test_connect_ok(
-	$common_connstr,
-	"sslrootcert=ssl/both-cas-2.crt sslmode=verify-ca",
-	"cert root file that contains two certificates, order 2");
+SKIP:
+{
+	skip "CA ordering is irrelevant in NSS databases", 2 if ($nss);
 
+	# Test with cert root file that contains two certificates. The client should
+	# be able to pick the right one, regardless of the order in the file.
+	test_connect_ok(
+		$common_connstr,
+		"sslrootcert=ssl/both-cas-1.crt sslmode=verify-ca",
+		"cert root file that contains two certificates, order 1");
+
+	# How about import the both-file into a database?
+	test_connect_ok(
+		$common_connstr,
+		"sslrootcert=ssl/both-cas-2.crt sslmode=verify-ca",
+		"cert root file that contains two certificates, order 2");
+}
 # CRL tests
 
 # Invalid CRL filename is the same as no CRL, succeeds
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=invalid",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=invalid cert_database=ssl/nss/root+server_ca.crt.db",
 	"sslcrl option with invalid file name");
 
-# A CRL belonging to a different CA is not accepted, fails
-test_connect_fails(
-	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/client.crl",
-	qr/SSL error/,
-	"CRL belonging to a different CA");
+SKIP:
+{
+	skip "CRL's are verified when adding to NSS database", 2 if ($nss);
+	# A CRL belonging to a different CA is not accepted, fails
+	test_connect_fails(
+		$common_connstr,
+		"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/client.crl",
+		qr/SSL error/,
+		"CRL belonging to a different CA");
+}
 
 # With the correct CRL, succeeds (this cert is not revoked)
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/root+server.crl",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/root+server.crl cert_database=ssl/nss/root+server_ca.crt__root+server.crl.db",
 	"CRL with a non-revoked cert");
 
 # Check that connecting with verify-full fails, when the hostname doesn't
 # match the hostname in the server's certificate.
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -237,14 +270,14 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"sslmode=verify-full host=wronghost.test",
-	qr/\Qserver certificate for "common-name.pg-ssltest.test" does not match host name "wronghost.test"\E/,
+	qr/\Qserver certificate for "common-name.pg-ssltest.test" does not match host name "wronghost.test"\E|requested domain name does not match the server's certificate/,
 	"mismatch between host name and server certificate sslmode=verify-full");
 
 # Test Subject Alternative Names.
 switch_server_cert($node, 'server-multiple-alt-names');
 
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -262,12 +295,12 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"host=wronghost.alt-name.pg-ssltest.test",
-	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "wronghost.alt-name.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "wronghost.alt-name.pg-ssltest.test"\E|requested domain name does not match the server's certificate/,
 	"host name not matching with X.509 Subject Alternative Names");
 test_connect_fails(
 	$common_connstr,
 	"host=deep.subdomain.wildcard.pg-ssltest.test",
-	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E|requested domain name does not match the server's certificate/,
 	"host name not matching with X.509 Subject Alternative Names wildcard");
 
 # Test certificate with a single Subject Alternative Name. (this gives a
@@ -275,7 +308,7 @@ test_connect_fails(
 switch_server_cert($node, 'server-single-alt-name');
 
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -285,12 +318,12 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"host=wronghost.alt-name.pg-ssltest.test",
-	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "wronghost.alt-name.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "wronghost.alt-name.pg-ssltest.test"\E|requested domain name does not match the server's certificate/,
 	"host name not matching with a single X.509 Subject Alternative Name");
 test_connect_fails(
 	$common_connstr,
 	"host=deep.subdomain.wildcard.pg-ssltest.test",
-	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E|requested domain name does not match the server's certificate/,
 	"host name not matching with a single X.509 Subject Alternative Name wildcard"
 );
 
@@ -299,7 +332,7 @@ test_connect_fails(
 switch_server_cert($node, 'server-cn-and-alt-names');
 
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -312,14 +345,14 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"host=common-name.pg-ssltest.test",
-	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 1 other name) does not match host name "common-name.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 1 other name) does not match host name "common-name.pg-ssltest.test"\E|requested domain name does not match the server's certificate/,
 	"certificate with both a CN and SANs ignores CN");
 
 # Finally, test a server certificate that has no CN or SANs. Of course, that's
 # not a very sensible certificate, but libpq should handle it gracefully.
 switch_server_cert($node, 'server-no-names');
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -328,7 +361,7 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"sslmode=verify-full host=common-name.pg-ssltest.test",
-	qr/could not get server's host name from server certificate/,
+	qr/could not get server's host name from server certificate|requested domain name does not match the server's certificate./,
 	"server certificate without CN or SANs sslmode=verify-full");
 
 # Test that the CRL works
@@ -340,11 +373,11 @@ $common_connstr =
 # Without the CRL, succeeds. With it, fails.
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca cert_database=ssl/nss/root+server_ca.crt.db",
 	"connects without client-side CRL");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/root+server.crl",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/server.crl cert_database=ssl/nss/root+server_ca.crt__server.crl.db",
 	qr/SSL error/,
 	"does not connect with client-side CRL");
 
@@ -365,32 +398,50 @@ command_like(
 # Test min/max SSL protocol versions.
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.2",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.2 cert_database=ssl/nss/root+server_ca.crt.db",
 	"connection success with correct range of TLS protocol versions");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.1",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.1 cert_database=ssl/nss/root+server_ca.crt.db",
 	qr/invalid SSL protocol version range/,
 	"connection failure with incorrect range of TLS protocol versions");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=incorrect_tls",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=incorrect_tls cert_database=ssl/nss/root+server_ca.crt.db",
 	qr/invalid ssl_min_protocol_version value/,
 	"connection failure with an incorrect SSL protocol minimum bound");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_max_protocol_version=incorrect_tls",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_max_protocol_version=incorrect_tls cert_database=ssl/nss/root+server_ca.crt.db",
 	qr/invalid ssl_max_protocol_version value/,
 	"connection failure with an incorrect SSL protocol maximum bound");
 
+# tests of NSS generated certificates/keys
+SKIP:
+{
+	skip "NSS specific tests",            1 if ($openssl);
+
+	switch_server_cert($node, 'native_server-root', 'native_ca-root');
+	$common_connstr =
+	  "user=ssltestuser dbname=trustdb hostaddr=$SERVERHOSTADDR host=common-name.pg-ssltest.test";
+
+	test_connect_ok(
+		$common_connstr,
+		"sslmode=require user=ssltestuser",
+		"NSS generated certificates"
+	);
+}
+
 ### Server-side tests.
 ###
 ### Test certificate authorization.
 
+switch_server_cert($node, 'server-revoked');
+
 note "running server tests";
 
 $common_connstr =
-  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR";
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client.crt__client.key.db";
 
 # no client cert
 test_connect_fails(
@@ -406,32 +457,43 @@ test_connect_ok(
 	"certificate authorization succeeds with correct client cert in PEM format"
 );
 
-# correct client cert in unencrypted DER
-test_connect_ok(
-	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-der_tmp.key",
-	"certificate authorization succeeds with correct client cert in DER format"
-);
+$common_connstr =
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR";
+
+SKIP:
+{
+	skip "NSS database not implemented in the Makefile", 1 if ($nss);
+	# correct client cert in unencrypted DER
+	test_connect_ok(
+		$common_connstr,
+		"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-der_tmp.key",
+		"certificate authorization succeeds with correct client cert in DER format"
+	);
+}
 
 # correct client cert in encrypted PEM
 test_connect_ok(
 	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='dUmmyP^#+'",
+	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='dUmmyP^#+' cert_database=ssl/nss/client.crt__client-encrypted-pem.key.db",
 	"certificate authorization succeeds with correct client cert in encrypted PEM format"
 );
 
-# correct client cert in encrypted DER
-test_connect_ok(
-	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-der_tmp.key sslpassword='dUmmyP^#+'",
-	"certificate authorization succeeds with correct client cert in encrypted DER format"
-);
+SKIP:
+{
+	skip "NSS database not implemented in the Makefile", 1 if ($nss);
+	# correct client cert in encrypted DER
+	test_connect_ok(
+		$common_connstr,
+		"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-der_tmp.key sslpassword='dUmmyP^#+'",
+		"certificate authorization succeeds with correct client cert in encrypted DER format"
+	);
+}
 
 # correct client cert in encrypted PEM with wrong password
 test_connect_fails(
 	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='wrong'",
-	qr!\Qprivate key file "ssl/client-encrypted-pem_tmp.key": bad decrypt\E!,
+	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='wrong' cert_database=ssl/nss/client.crt__client-encrypted-pem.key.db",
+	qr!connection requires a valid client certificate|\Qprivate key file "ssl/client-encrypted-pem_tmp.key": bad decrypt\E!,
 	"certificate authorization fails with correct client cert and wrong password in encrypted PEM format"
 );
 
@@ -471,18 +533,19 @@ command_like(
 		'-P',
 		'null=_null_',
 		'-d',
-		"$common_connstr user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client_tmp.key",
+		"$common_connstr user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client_tmp.key cert_database=ssl/nss/client.crt__client.key.db",
 		'-c',
 		"SELECT * FROM pg_stat_ssl WHERE pid = pg_backend_pid()"
 	],
 	qr{^pid,ssl,version,cipher,bits,compression,client_dn,client_serial,issuer_dn\r?\n
-				^\d+,t,TLSv[\d.]+,[\w-]+,\d+,f,/CN=ssltestuser,1,\Q/CN=Test CA for PostgreSQL SSL regression test client certs\E\r?$}mx,
+				^\d+,t,TLSv[\d.]+,[\w-]+,\d+,f,/?CN=ssltestuser,1,/?\QCN=Test CA for PostgreSQL SSL regression test client certs\E\r?$}mx,
 	'pg_stat_ssl with client certificate');
 
 # client key with wrong permissions
 SKIP:
 {
 	skip "Permissions check not enforced on Windows", 2 if ($windows_os);
+	skip "Key not on filesystem with NSS",            2 if ($nss);
 
 	test_connect_fails(
 		$common_connstr,
@@ -495,10 +558,13 @@ SKIP:
 test_connect_fails(
 	$common_connstr,
 	"user=anotheruser sslcert=ssl/client.crt sslkey=ssl/client_tmp.key",
-	qr/certificate authentication failed for user "anotheruser"/,
+	qr/unable to verify certificate|certificate authentication failed for user "anotheruser"/,
 	"certificate authorization fails with client cert belonging to another user"
 );
 
+$common_connstr =
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client-revoked.crt__client-revoked.key.db";
+
 # revoked client cert
 test_connect_fails(
 	$common_connstr,
@@ -510,7 +576,7 @@ test_connect_fails(
 # works, iff username matches Common Name
 # fails, iff username doesn't match Common Name.
 $common_connstr =
-  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=verifydb hostaddr=$SERVERHOSTADDR";
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=verifydb hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client.crt__client.key.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -536,17 +602,23 @@ test_connect_ok(
 # intermediate client_ca.crt is provided by client, and isn't in server's ssl_ca_file
 switch_server_cert($node, 'server-cn-only', 'root_ca');
 $common_connstr =
-  "user=ssltestuser dbname=certdb sslkey=ssl/client_tmp.key sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR";
+  "user=ssltestuser dbname=certdb sslkey=ssl/client_tmp.key sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client+client_ca.crt__client.key.db";
 
-test_connect_ok(
+TODO:
+{
+	local $TODO = "WIP failure cause currently unknown";
+	test_connect_ok(
+		$common_connstr,
+		"sslmode=require sslcert=ssl/client+client_ca.crt",
+		"intermediate client certificate is provided by client");
+}
+
+test_connect_fails(
 	$common_connstr,
-	"sslmode=require sslcert=ssl/client+client_ca.crt",
-	"intermediate client certificate is provided by client");
-test_connect_fails($common_connstr, "sslmode=require sslcert=ssl/client.crt",
-	qr/SSL error/, "intermediate client certificate is missing");
+	"sslmode=require sslcert=ssl/client.crt",
+	qr/connection requires a valid client certificate|SSL error/,
+	"intermediate client certificate is missing");
 
 # clean up
-foreach my $key (@keys)
-{
-	unlink("ssl/${key}_tmp.key");
-}
+
+SSL::Server::cleanup();
diff --git a/src/test/ssl/t/002_scram.pl b/src/test/ssl/t/002_scram.pl
index a088f71a1a..cf5714e544 100644
--- a/src/test/ssl/t/002_scram.pl
+++ b/src/test/ssl/t/002_scram.pl
@@ -11,24 +11,39 @@ use File::Copy;
 use FindBin;
 use lib $FindBin::RealBin;
 
-use SSLServer;
+use SSL::Server;
 
-if ($ENV{with_openssl} ne 'yes')
+my $openssl;
+my $nss;
+
+my $supports_tls_server_end_point;
+
+if ($ENV{with_ssl} eq 'no')
 {
 	plan skip_all => 'SSL not supported by this build';
 }
+else
+{
+	if ($ENV{with_ssl} eq 'openssl')
+	{
+		$openssl = 1;
+		# Determine whether build supports tls-server-end-point.
+		$supports_tls_server_end_point =
+			check_pg_config("#define HAVE_X509_GET_SIGNATURE_NID 1");
+		plan tests => $supports_tls_server_end_point ? 9 : 10;
+	}
+	elsif ($ENV{with_ssl} eq 'nss')
+	{
+		$nss = 1;
+		plan tests => 8;
+	}
+}
 
 # This is the hostname used to connect to the server.
 my $SERVERHOSTADDR = '127.0.0.1';
 # This is the pattern to use in pg_hba.conf to match incoming connections.
 my $SERVERHOSTCIDR = '127.0.0.1/32';
 
-# Determine whether build supports tls-server-end-point.
-my $supports_tls_server_end_point =
-  check_pg_config("#define HAVE_X509_GET_SIGNATURE_NID 1");
-
-my $number_of_tests = $supports_tls_server_end_point ? 9 : 10;
-
 # Allocation of base connection string shared among multiple tests.
 my $common_connstr;
 
@@ -66,20 +81,25 @@ test_connect_ok(
 	$common_connstr,
 	"user=ssltestuser channel_binding=disable",
 	"SCRAM with SSL and channel_binding=disable");
-if ($supports_tls_server_end_point)
-{
-	test_connect_ok(
-		$common_connstr,
-		"user=ssltestuser channel_binding=require",
-		"SCRAM with SSL and channel_binding=require");
-}
-else
+
+SKIP:
 {
-	test_connect_fails(
-		$common_connstr,
-		"user=ssltestuser channel_binding=require",
-		qr/channel binding is required, but server did not offer an authentication method that supports channel binding/,
-		"SCRAM with SSL and channel_binding=require");
+	skip "NSS support for TLS server endpoing is not implemented", 1 if ($nss);
+	if ($supports_tls_server_end_point)
+	{
+		test_connect_ok(
+			$common_connstr,
+			"user=ssltestuser channel_binding=require",
+			"SCRAM with SSL and channel_binding=require");
+	}
+	else
+	{
+		test_connect_fails(
+			$common_connstr,
+			"user=ssltestuser channel_binding=require",
+			qr/channel binding is required, but server did not offer an authentication method that supports channel binding/,
+			"SCRAM with SSL and channel_binding=require");
+	}
 }
 
 # Now test when the user has an MD5-encrypted password; should fail
@@ -89,20 +109,21 @@ test_connect_fails(
 	qr/channel binding required but not supported by server's authentication request/,
 	"MD5 with SSL and channel_binding=require");
 
-# Now test with auth method 'cert' by connecting to 'certdb'. Should fail,
-# because channel binding is not performed.  Note that ssl/client.key may
-# be used in a different test, so the name of this temporary client key
-# is chosen here to be unique.
-my $client_tmp_key = "ssl/client_scram_tmp.key";
-copy("ssl/client.key", $client_tmp_key);
-chmod 0600, $client_tmp_key;
-test_connect_fails(
-	"sslcert=ssl/client.crt sslkey=$client_tmp_key sslrootcert=invalid hostaddr=$SERVERHOSTADDR",
-	"dbname=certdb user=ssltestuser channel_binding=require",
-	qr/channel binding required, but server authenticated client without channel binding/,
-	"Cert authentication and channel_binding=require");
-
-# clean up
-unlink($client_tmp_key);
-
-done_testing($number_of_tests);
+SKIP:
+{
+	skip "NSS support not implemented yet", 1 if ($nss);
+	# Now test with auth method 'cert' by connecting to 'certdb'. Should fail,
+	# because channel binding is not performed.  Note that ssl/client.key may
+	# be used in a different test, so the name of this temporary client key
+	# is chosen here to be unique.
+	my $client_tmp_key = "ssl/client_scram_tmp.key";
+	copy("ssl/client.key", $client_tmp_key);
+	chmod 0600, $client_tmp_key;
+	test_connect_fails(
+		"sslcert=ssl/client.crt sslkey=$client_tmp_key sslrootcert=invalid hostaddr=$SERVERHOSTADDR",
+		"dbname=certdb user=ssltestuser channel_binding=require",
+		qr/channel binding required, but server authenticated client without channel binding/,
+		"Cert authentication and channel_binding=require");
+	# clean up
+	unlink($client_tmp_key);
+}
diff --git a/src/test/ssl/t/SSL/Backend/NSS.pm b/src/test/ssl/t/SSL/Backend/NSS.pm
new file mode 100644
index 0000000000..c5b31e584a
--- /dev/null
+++ b/src/test/ssl/t/SSL/Backend/NSS.pm
@@ -0,0 +1,73 @@
+package SSL::Backend::NSS;
+
+use strict;
+use warnings;
+use Exporter;
+
+our @ISA       = qw(Exporter);
+our @EXPORT_OK = qw(get_new_nss_backend);
+
+sub new
+{
+	my ($class) = @_;
+
+	my $self = { _library => 'NSS' };
+
+	bless $self, $class;
+
+	return $self;
+}
+
+sub get_new_nss_backend
+{
+	my $class = 'SSL::Backend::NSS';
+
+	return $class->new();
+}
+
+sub init
+{
+	# Make sure the certificate databases are in place?
+}
+
+sub get_library
+{
+	my ($self) = @_;
+
+	return $self->{_library};
+}
+
+sub set_server_cert
+{
+	my $self     = $_[0];
+	my $certfile = $_[1];
+	my $cafile   = $_[2];
+	my $keyfile  = $_[3];
+
+	my $cert_nickname;
+
+	if ($certfile =~ /native/)
+	{
+		$cert_nickname = $certfile;
+	}
+	else
+	{
+		$cert_nickname = $certfile . '.crt__' . $keyfile . '.key';
+	}
+	my $cert_database = $cert_nickname . '.db';
+
+	my $sslconf =
+	    "ssl_ca_file='$cafile.crt'\n"
+	  . "ssl_cert_file='ssl/$certfile.crt'\n"
+	  . "ssl_crl_file=''\n"
+	  . "ssl_database='nss/$cert_database'\n";
+
+	return $sslconf;
+}
+
+sub cleanup
+{
+	# Something?
+}
+
+1;
diff --git a/src/test/ssl/t/SSL/Backend/OpenSSL.pm b/src/test/ssl/t/SSL/Backend/OpenSSL.pm
new file mode 100644
index 0000000000..62b11b7632
--- /dev/null
+++ b/src/test/ssl/t/SSL/Backend/OpenSSL.pm
@@ -0,0 +1,103 @@
+package SSL::Backend::OpenSSL;
+
+use strict;
+use warnings;
+use Exporter;
+use File::Copy;
+
+our @ISA       = qw(Exporter);
+our @EXPORT_OK = qw(get_new_openssl_backend);
+
+our (@keys);
+
+INIT
+{
+	@keys = (
+		"client",     "client-revoked",
+		"client-der", "client-encrypted-pem",
+		"client-encrypted-der");
+}
+
+sub new
+{
+	my ($class) = @_;
+
+	my $self = { _library => 'OpenSSL' };
+
+	bless $self, $class;
+
+	return $self;
+}
+
+sub get_new_openssl_backend
+{
+	my $class = 'SSL::Backend::OpenSSL';
+
+	my $backend = $class->new();
+
+	return $backend;
+}
+
+sub init
+{
+	# The client's private key must not be world-readable, so take a copy
+	# of the key stored in the code tree and update its permissions.
+	#
+	# This changes ssl/client.key to ssl/client_tmp.key etc for the rest
+	# of the tests.
+	foreach my $key (@keys)
+	{
+		copy("ssl/${key}.key", "ssl/${key}_tmp.key")
+		  or die
+		  "couldn't copy ssl/${key}.key to ssl/${key}_tmp.key for permissions change: $!";
+		chmod 0600, "ssl/${key}_tmp.key"
+		  or die "failed to change permissions on ssl/${key}_tmp.key: $!";
+	}
+
+	# Also make a copy of that explicitly world-readable.  We can't
+	# necessarily rely on the file in the source tree having those
+	# permissions. Add it to @keys to include it in the final clean
+	# up phase.
+	copy("ssl/client.key", "ssl/client_wrongperms_tmp.key")
+	  or die
+	  "couldn't copy ssl/client.key to ssl/client_wrongperms_tmp.key: $!";
+	chmod 0644, "ssl/client_wrongperms_tmp.key"
+	  or die
+	  "failed to change permissions on ssl/client_wrongperms_tmp.key: $!";
+	push @keys, 'client_wrongperms';
+}
+
+# Change the configuration to use given server cert file, and reload
+# the server so that the configuration takes effect.
+sub set_server_cert
+{
+	my $self     = $_[0];
+	my $certfile = $_[1];
+	my $cafile   = $_[2] || "root+client_ca";
+	my $keyfile  = $_[3] || $certfile;
+
+	my $sslconf =
+	    "ssl_ca_file='$cafile.crt'\n"
+	  . "ssl_cert_file='$certfile.crt'\n"
+	  . "ssl_key_file='$keyfile.key'\n"
+	  . "ssl_crl_file='root+client.crl'\n";
+
+	return $sslconf;
+}
+
+sub get_library
+{
+	my ($self) = @_;
+
+	return $self->{_library};
+}
+
+sub cleanup
+{
+	foreach my $key (@keys)
+	{
+		unlink("ssl/${key}_tmp.key");
+	}
+}
+
+1;
diff --git a/src/test/ssl/t/SSLServer.pm b/src/test/ssl/t/SSL/Server.pm
similarity index 78%
rename from src/test/ssl/t/SSLServer.pm
rename to src/test/ssl/t/SSL/Server.pm
index f5987a003e..ee901855b5 100644
--- a/src/test/ssl/t/SSLServer.pm
+++ b/src/test/ssl/t/SSL/Server.pm
@@ -23,19 +23,39 @@
 # explicitly because an invalid sslcert or sslrootcert, respectively,
 # causes those to be ignored.)
 
-package SSLServer;
+package SSL::Server;
 
 use strict;
 use warnings;
 use PostgresNode;
+use RecursiveCopy;
 use TestLib;
 use File::Basename;
 use File::Copy;
 use Test::More;
+use SSL::Backend::OpenSSL qw(get_new_openssl_backend);
+use SSL::Backend::NSS qw(get_new_nss_backend);
+
+our ($openssl, $nss, $backend);
+
+# The TLS backend which the server is using should be mostly transparent for
+# the user, apart from individual configuration settings, so keep the backend
+# specific things abstracted behind SSL::Server.
+if ($ENV{with_ssl} eq 'openssl')
+{
+	$backend = get_new_openssl_backend();
+	$openssl = 1;
+}
+elsif ($ENV{with_ssl} eq 'nss')
+{
+	$backend = get_new_nss_backend();
+	$nss     = 1;
+}
 
 use Exporter 'import';
 our @EXPORT = qw(
   configure_test_server_for_ssl
+  set_server_cert
   switch_server_cert
   test_connect_fails
   test_connect_ok
@@ -144,12 +164,19 @@ sub configure_test_server_for_ssl
 	close $sslconf;
 
 	# Copy all server certificates and keys, and client root cert, to the data dir
-	copy_files("ssl/server-*.crt", $pgdata);
-	copy_files("ssl/server-*.key", $pgdata);
-	chmod(0600, glob "$pgdata/server-*.key") or die $!;
-	copy_files("ssl/root+client_ca.crt", $pgdata);
-	copy_files("ssl/root_ca.crt",        $pgdata);
-	copy_files("ssl/root+client.crl",    $pgdata);
+	if (defined($openssl))
+	{
+		copy_files("ssl/server-*.crt", $pgdata);
+		copy_files("ssl/server-*.key", $pgdata);
+		chmod(0600, glob "$pgdata/server-*.key") or die $!;
+		copy_files("ssl/root+client_ca.crt", $pgdata);
+		copy_files("ssl/root_ca.crt",        $pgdata);
+		copy_files("ssl/root+client.crl",    $pgdata);
+	}
+	elsif (defined($nss))
+	{
+		RecursiveCopy::copypath("ssl/nss", $pgdata . "/nss") if -e "ssl/nss";
+	}
 
 	# Stop and restart server to load new listen_addresses.
 	$node->restart;
@@ -157,26 +184,51 @@ sub configure_test_server_for_ssl
 	# Change pg_hba after restart because hostssl requires ssl=on
 	configure_hba_for_ssl($node, $servercidr, $authmethod);
 
+	# Finally, perform backend specific configuration
+	$backend->init();
+
 	return;
 }
 
-# Change the configuration to use given server cert file, and reload
-# the server so that the configuration takes effect.
-sub switch_server_cert
+sub ssl_library
+{
+	return $backend->get_library();
+}
+
+sub cleanup
+{
+	$backend->cleanup();
+}
+
+# Change the configuration to use given server cert file,
+sub set_server_cert
 {
 	my $node     = $_[0];
 	my $certfile = $_[1];
 	my $cafile   = $_[2] || "root+client_ca";
+	my $keyfile  = $_[3] || '';
+	my $pwcmd    = $_[4] || '';
 	my $pgdata   = $node->data_dir;
 
+	$keyfile = $certfile if $keyfile eq '';
+
 	open my $sslconf, '>', "$pgdata/sslconfig.conf";
 	print $sslconf "ssl=on\n";
-	print $sslconf "ssl_ca_file='$cafile.crt'\n";
-	print $sslconf "ssl_cert_file='$certfile.crt'\n";
-	print $sslconf "ssl_key_file='$certfile.key'\n";
-	print $sslconf "ssl_crl_file='root+client.crl'\n";
+	print $sslconf $backend->set_server_cert($certfile, $cafile, $keyfile);
+	print $sslconf "ssl_passphrase_command='$pwcmd'\n"
+	  unless $pwcmd eq '';
 	close $sslconf;
+	return;
+}
 
+# Change the configuration to use given server cert file, and reload
+# the server so that the configuration takes effect.
+# Takes the same arguments as set_server_cert, which it calls to do that
+# piece of the work.
+sub switch_server_cert
+{
+	my $node = $_[0];
+	set_server_cert(@_);
 	$node->restart;
 	return;
 }
-- 
2.21.1 (Apple Git-122.3)

From e296533d4e5c3491dc55856d475bf85a8c7183e2 Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Wed, 28 Oct 2020 11:24:02 +0100
Subject: [PATCH v21 3/6] NSS pg_strong_random support

---
 configure                   |  3 ++-
 configure.ac                |  3 ++-
 src/include/pg_config.h.in  |  3 +++
 src/port/pg_strong_random.c | 50 ++++++++++++++++++++++++++++++++++++-
 4 files changed, 56 insertions(+), 3 deletions(-)

diff --git a/configure b/configure
index cc6088b545..876a0ea839 100755
--- a/configure
+++ b/configure
@@ -18441,6 +18441,7 @@ $as_echo "NSS" >&6; }
 elif test x"$PORTNAME" = x"win32" ; then
   { $as_echo "$as_me:${as_lineno-$LINENO}: result: Windows native" >&5
 $as_echo "Windows native" >&6; }
+
 else
   { $as_echo "$as_me:${as_lineno-$LINENO}: result: /dev/urandom" >&5
 $as_echo "/dev/urandom" >&6; }
@@ -18467,7 +18468,7 @@ fi
   if test x"$ac_cv_file__dev_urandom" = x"no" ; then
     as_fn_error $? "
 no source of strong random numbers was found
-PostgreSQL can use OpenSSL, native Windows API or /dev/urandom as a source of random numbers." "$LINENO" 5
+PostgreSQL can use OpenSSL, NSS, native Windows API or /dev/urandom as a source of random numbers." "$LINENO" 5
   fi
 fi
 
diff --git a/configure.ac b/configure.ac
index 0da8cc9b0b..6b6641a094 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2203,6 +2203,7 @@ elif test x"$with_nss" = x"yes" ; then
   AC_MSG_RESULT([NSS])
 elif test x"$PORTNAME" = x"win32" ; then
   AC_MSG_RESULT([Windows native])
+
 else
   AC_MSG_RESULT([/dev/urandom])
   AC_CHECK_FILE([/dev/urandom], [], [])
@@ -2210,7 +2211,7 @@ else
   if test x"$ac_cv_file__dev_urandom" = x"no" ; then
     AC_MSG_ERROR([
 no source of strong random numbers was found
-PostgreSQL can use OpenSSL, native Windows API or /dev/urandom as a source of random numbers.])
+PostgreSQL can use OpenSSL, NSS, native Windows API or /dev/urandom as a source of random numbers.])
   fi
 fi
 
diff --git a/src/include/pg_config.h.in b/src/include/pg_config.h.in
index 67a9f90e5e..0894ff2bef 100644
--- a/src/include/pg_config.h.in
+++ b/src/include/pg_config.h.in
@@ -908,6 +908,9 @@
 /* Define to build with NSS support (--with-nss) */
 #undef USE_NSS
 
+/* Define to use NSS for random number generation */
+#undef USE_NSS_RANDOM
+
 /* Define to 1 to use software CRC-32C implementation (slicing-by-8). */
 #undef USE_SLICING_BY_8_CRC32C
 
diff --git a/src/port/pg_strong_random.c b/src/port/pg_strong_random.c
index 07f24c0089..40de237628 100644
--- a/src/port/pg_strong_random.c
+++ b/src/port/pg_strong_random.c
@@ -137,7 +137,55 @@ pg_strong_random(void *buf, size_t len)
 	return false;
 }
 
-#else							/* not USE_OPENSSL or WIN32 */
+#elif defined(USE_NSS)
+
+#define pg_BITS_PER_BYTE BITS_PER_BYTE
+#undef BITS_PER_BYTE
+#define NO_NSPR_10_SUPPORT
+#include <nss/nss.h>
+#include <nss/pk11pub.h>
+#if defined(BITS_PER_BYTE)
+#if BITS_PER_BYTE != pg_BITS_PER_BYTE
+#error "incompatible byte widths between NSPR and postgres"
+#endif
+#else
+#define BITS_PER_BYTE pg_BITS_PER_BYTE
+#endif
+#undef pg_BITS_PER_BYTE
+
+void
+pg_strong_random_init(void)
+{
+	/* No initialization needed on NSS */
+}
+
+bool
+pg_strong_random(void *buf, size_t len)
+{
+	NSSInitParameters params;
+	NSSInitContext *nss_context;
+	SECStatus	status;
+
+	memset(&params, 0, sizeof(params));
+	params.length = sizeof(params);
+	nss_context = NSS_InitContext("", "", "", "", &params,
+								  NSS_INIT_READONLY | NSS_INIT_NOCERTDB |
+								  NSS_INIT_NOMODDB | NSS_INIT_FORCEOPEN |
+								  NSS_INIT_NOROOTINIT | NSS_INIT_PK11RELOAD);
+
+	if (!nss_context)
+		return false;
+
+	status = PK11_GenerateRandom(buf, len);
+	NSS_ShutdownContext(nss_context);
+
+	if (status == SECSuccess)
+		return true;
+
+	return false;
+}
+
+#else							/* not USE_OPENSSL, USE_NSS or WIN32 */
 
 /*
  * Without OpenSSL or Win32 support, just read /dev/urandom ourselves.
-- 
2.21.1 (Apple Git-122.3)

From bb8a37864a562cb965083cde345bd3509fb24906 Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Wed, 28 Oct 2020 11:26:31 +0100
Subject: [PATCH v21 4/6] NSS Documentation

---
 doc/src/sgml/acronyms.sgml     |  43 ++++++++++++
 doc/src/sgml/config.sgml       |  28 +++++++-
 doc/src/sgml/installation.sgml |  30 +++++++-
 doc/src/sgml/libpq.sgml        |  99 +++++++++++++++++++++++++-
 doc/src/sgml/runtime.sgml      | 122 +++++++++++++++++++++++++++++++--
 5 files changed, 310 insertions(+), 12 deletions(-)

diff --git a/doc/src/sgml/acronyms.sgml b/doc/src/sgml/acronyms.sgml
index 4e5ec983c0..7b02c8a622 100644
--- a/doc/src/sgml/acronyms.sgml
+++ b/doc/src/sgml/acronyms.sgml
@@ -441,6 +441,28 @@
     </listitem>
    </varlistentry>
 
+   <varlistentry>
+    <term><acronym>NSPR</acronym></term>
+    <listitem>
+     <para>
+      <ulink
+      url="https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSPR">
+      Netscape Portable Runtime</ulink>
+     </para>
+    </listitem>
+   </varlistentry>
+
+   <varlistentry>
+    <term><acronym>NSS</acronym></term>
+    <listitem>
+     <para>
+      <ulink
+      url="https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS">
+      Network Security Services</ulink>
+     </para>
+    </listitem>
+   </varlistentry>
+
    <varlistentry>
     <term><acronym>ODBC</acronym></term>
     <listitem>
@@ -539,6 +561,17 @@
     </listitem>
    </varlistentry>
 
+   <varlistentry>
+    <term><acronym>PKCS#12</acronym></term>
+    <listitem>
+     <para>
+      <ulink
+      url="https://en.wikipedia.org/wiki/PKCS_12">
+      Public-Key Cryptography Standards #12</ulink>
+     </para>
+    </listitem>
+   </varlistentry>
+
    <varlistentry>
     <term><acronym>PL</acronym></term>
     <listitem>
@@ -684,6 +717,16 @@
     </listitem>
    </varlistentry>
 
+   <varlistentry>
+    <term><acronym>TLS</acronym></term>
+    <listitem>
+     <para>
+      <ulink url="https://en.wikipedia.org/wiki/Transport_Layer_Security">
+      Transport Layer Security</ulink>
+     </para>
+    </listitem>
+   </varlistentry>
+
    <varlistentry>
     <term><acronym>TOAST</acronym></term>
     <listitem>
diff --git a/doc/src/sgml/config.sgml b/doc/src/sgml/config.sgml
index 82864bbb24..6738f8001f 100644
--- a/doc/src/sgml/config.sgml
+++ b/doc/src/sgml/config.sgml
@@ -1236,6 +1236,23 @@ include_dir 'conf.d'
       </listitem>
      </varlistentry>
 
+     <varlistentry id="guc-ssl-database" xreflabel="ssl_database">
+      <term><varname>ssl_database</varname> (<type>string</type>)
+      <indexterm>
+       <primary><varname>ssl_database</varname> configuration parameter</primary>
+      </indexterm>
+      </term>
+      <listitem>
+       <para>
+        Specifies the name of the file containing the server certificates and
+        keys when using <productname>NSS</productname> for <acronym>SSL</acronym>
+        connections. This parameter can only be set in the
+        <filename>postgresql.conf</filename> file or on the server command
+        line.
+       </para>
+      </listitem>
+     </varlistentry>
+
      <varlistentry id="guc-ssl-ciphers" xreflabel="ssl_ciphers">
       <term><varname>ssl_ciphers</varname> (<type>string</type>)
       <indexterm>
@@ -1252,7 +1269,9 @@ include_dir 'conf.d'
         connections using TLS version 1.2 and lower are affected.  There is
         currently no setting that controls the cipher choices used by TLS
         version 1.3 connections.  The default value is
-        <literal>HIGH:MEDIUM:+3DES:!aNULL</literal>.  The default is usually a
+        <literal>HIGH:MEDIUM:+3DES:!aNULL</literal> for servers which have
+        been built with <productname>OpenSSL</productname> as the
+        <acronym>SSL</acronym> library.  The default is usually a
         reasonable choice unless you have specific security requirements.
        </para>
 
@@ -1454,8 +1473,11 @@ include_dir 'conf.d'
        <para>
         Sets an external command to be invoked when a passphrase for
         decrypting an SSL file such as a private key needs to be obtained.  By
-        default, this parameter is empty, which means the built-in prompting
-        mechanism is used.
+        default, this parameter is empty. When the server is using
+        <productname>OpenSSL</productname>, this means the built-in prompting
+        mechanism is used. When using <productname>NSS</productname>, there is
+        no default prompting so a blank callback will be used returning an
+        empty password.
        </para>
        <para>
         The command must print the passphrase to the standard output and exit
diff --git a/doc/src/sgml/installation.sgml b/doc/src/sgml/installation.sgml
index 0ac1cb9999..bd09124fb0 100644
--- a/doc/src/sgml/installation.sgml
+++ b/doc/src/sgml/installation.sgml
@@ -250,7 +250,7 @@ su - postgres
 
     <listitem>
      <para>
-      You need <productname>OpenSSL</productname>, if you want to support
+      You need a supported <acronym>SSL</acronym> library, if you want to support
       encrypted client connections.  <productname>OpenSSL</productname> is
       also required for random number generation on platforms that do not
       have <filename>/dev/urandom</filename> (except Windows).  The minimum
@@ -966,6 +966,31 @@ build-postgresql:
        </listitem>
       </varlistentry>
 
+      <varlistentry>
+       <term><option>--with-nss</option>
+       <indexterm>
+        <primary>NSS</primary>
+        <secondary>NSPR</secondary>
+        <seealso>SSL</seealso>
+       </indexterm>
+       </term>
+       <listitem>
+        <para>
+         Build with support for <acronym>SSL</acronym> (encrypted)
+         connections using <productname>NSS</productname>. This requires the
+         <productname>NSS</productname> package to be installed. Additionally,
+         <productname>NSS</productname> requires <productname>NSPR</productname>
+         to be installed. <filename>configure</filename> will check for the
+         required header files and libraries to make sure that your
+         <productname>NSS</productname> installation is sufficient before
+         proceeding.
+        </para>
+        <para>
+         This option is incompatible with <literal>--with-openssl</literal>.
+        </para>
+       </listitem>
+      </varlistentry>
+
       <varlistentry>
        <term><option>--with-openssl</option>
        <indexterm>
@@ -982,6 +1007,9 @@ build-postgresql:
          your <productname>OpenSSL</productname> installation is sufficient
          before proceeding.
         </para>
+        <para>
+         This option is incompatible with <literal>--with-nss</literal>.
+        </para>
        </listitem>
       </varlistentry>
 
diff --git a/doc/src/sgml/libpq.sgml b/doc/src/sgml/libpq.sgml
index 2bb3bf77e4..3225736f56 100644
--- a/doc/src/sgml/libpq.sgml
+++ b/doc/src/sgml/libpq.sgml
@@ -830,6 +830,12 @@ int callback_fn(char *buf, int size, PGconn *conn);
        <function>longjmp(...)</function>, etc. It must return normally.
       </para>
 
+      <para>
+        <function>PQsetSSLKeyPassHook_OpenSSL</function> is only available
+        when the server was compiled with <productname>OpenSSL</productname>
+        support.
+      </para>
+
      </listitem>
     </varlistentry>
 
@@ -846,6 +852,72 @@ PQsslKeyPassHook_OpenSSL_type PQgetSSLKeyPassHook_OpenSSL(void);
 </synopsis>
       </para>
 
+      <para>
+        <function>PQgetSSLKeyPassHook_OpenSSL</function> is only available
+        when the server was compiled with <productname>OpenSSL</productname>
+        support.
+      </para>
+
+     </listitem>
+    </varlistentry>
+
+    <varlistentry id="libpq-pqsetsslkeypasshook-nss">
+     <term><function>PQsetSSLKeyPassHook_nss</function><indexterm><primary>PQsetSSLKeyPassHook_nss</primary></indexterm></term>
+     <listitem>
+      <para>
+       <function>PQsetSSLKeyPassHook_nss</function> lets an application override
+       <application>libpq</application>'s default handling of password protected
+       objects in the <application>NSS</application> database using
+       <xref linkend="libpq-connect-sslpassword"/> or interactive prompting.
+
+<synopsis>
+void PQsetSSLKeyPassHook_nss(PQsslKeyPassHook_nss_type hook);
+</synopsis>
+
+       The application passes a pointer to a callback function with signature:
+<programlisting>
+char *callback_fn(PK11SlotInfo *slot, PRBool retry, void *arg);
+</programlisting>
+       which <application>libpq</application> will call
+       <emphasis>instead of</emphasis> its default
+       <function>PQdefaultSSLKeyPassHook_nss</function> password handler. The
+       callback should determine the password for the token and return a
+       pointer to it. The returned pointer should be allocated with the NSS
+       <function>PORT_Strdup</function> function. The token for which the
+       password is requested is recorded in the slot anc can be identified by
+       calling <function>PK11_GetTokenName</function>. If no password is
+       known, the callback should return <literal>NULL</literal>. The memory
+       will be owned by <productname>NSS</productname> and should not be
+       freed.
+      </para>
+
+      <para>
+        <function>PQsetSSLKeyPassHook_nss</function> is only available
+        when the server was compiled with <productname>NSS</productname>
+        support.
+      </para>
+     </listitem>
+    </varlistentry>
+
+    <varlistentry id="libpq-pqgetsslkeypasshook-nss">
+     <term><function>PQgetSSLKeyPassHook_nss</function><indexterm><primary>PQgetSSLKeyPassHook_nss</primary></indexterm></term>
+     <listitem>
+      <para>
+       <function>PQgetSSLKeyPassHook_nss</function> returns the current
+       <productname>NSS</productname> password hook, or <literal>NULL</literal>
+       if none has been set.
+
+<synopsis>
+PQsslKeyPassHook_nss_type PQgetSSLKeyPassHook_nss(void);
+</synopsis>
+      </para>
+
+      <para>
+        <function>PQgetSSLKeyPassHook_nss</function> is only available
+        when the server was compiled with <productname>nss</productname>
+        support.
+      </para>
+
      </listitem>
     </varlistentry>
 
@@ -2497,6 +2569,8 @@ void *PQsslStruct(const PGconn *conn, const char *struct_name);
       </para>
       <para>
        The struct(s) available depend on the SSL implementation in use.
+      </para>
+      <para>
        For <productname>OpenSSL</productname>, there is one struct,
        available under the name "OpenSSL", and it returns a pointer to the
        <productname>OpenSSL</productname> <literal>SSL</literal> struct.
@@ -2520,9 +2594,14 @@ void *PQsslStruct(const PGconn *conn, const char *struct_name);
 ]]></programlisting>
       </para>
       <para>
-       This structure can be used to verify encryption levels, check server
-       certificates, and more. Refer to the <productname>OpenSSL</productname>
-       documentation for information about this structure.
+       For <productname>NSS</productname>, there is one struct available under
+       the name "NSS", and it returns a pointer to the
+       <productname>NSS</productname> <literal>PRFileDesc</literal>.
+      </para>
+      <para>
+       These structures can be used to verify encryption levels, check server
+       certificates, and more. Refer to the <acronym>SSL</acronym> library
+       documentation for information about these structures.
       </para>
      </listitem>
     </varlistentry>
@@ -2549,6 +2628,10 @@ void *PQgetssl(const PGconn *conn);
        <xref linkend="libpq-PQsslInUse"/> instead, and for more details about the
        connection, use <xref linkend="libpq-PQsslAttribute"/>.
       </para>
+      <para>
+       This function returns <literal>NULL</literal> when <acronym>SSL</acronym>
+       librariaes other than <productname>OpenSSL</productname> are used.
+      </para>
      </listitem>
     </varlistentry>
 
@@ -7982,6 +8065,11 @@ void PQinitOpenSSL(int do_ssl, int do_crypto);
        before first opening a database connection.  Also be sure that you
        have done that initialization before opening a database connection.
       </para>
+
+      <para>
+       This function does nothing when using <productname>NSS</productname> as
+       the <acronym>SSL</acronym> library.
+      </para>
      </listitem>
     </varlistentry>
 
@@ -8008,6 +8096,11 @@ void PQinitSSL(int do_ssl);
        might be preferable for applications that need to work with older
        versions of <application>libpq</application>.
       </para>
+
+      <para>
+       This function does nothing when using <productname>NSS</productname> as
+       the <acronym>SSL</acronym> library.
+      </para>
      </listitem>
     </varlistentry>
    </variablelist>
diff --git a/doc/src/sgml/runtime.sgml b/doc/src/sgml/runtime.sgml
index 283352d3a4..d51ba37219 100644
--- a/doc/src/sgml/runtime.sgml
+++ b/doc/src/sgml/runtime.sgml
@@ -2183,15 +2183,21 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
 
   <indexterm zone="ssl-tcp">
    <primary>SSL</primary>
+   <secondary>TLS</secondary>
   </indexterm>
 
   <para>
    <productname>PostgreSQL</productname> has native support for using
    <acronym>SSL</acronym> connections to encrypt client/server communications
    for increased security. This requires that
-   <productname>OpenSSL</productname> is installed on both client and
+   a supported TLS library is installed on both client and
    server systems and that support in <productname>PostgreSQL</productname> is
    enabled at build time (see <xref linkend="installation"/>).
+   Supported libraries are <productname>OpenSSL</productname> and
+   <productname>NSS</productname>. The terms <acronym>SSL</acronym> and
+   <acronym>TLS</acronym> are often used interchangeably to mean a secure
+   connection using a <acronym>TLS</acronym> protocol, even though
+   <acronym>SSL</acronym> protocols are no longer supported.
   </para>
 
   <sect2 id="ssl-setup">
@@ -2211,8 +2217,13 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
   </para>
 
   <para>
-   To start in <acronym>SSL</acronym> mode, files containing the server certificate
-   and private key must exist.  By default, these files are expected to be
+   To start in <acronym>SSL</acronym> mode, a server certificate
+   and private key must exist. The below sections on the different libraries
+   will discuss how to configure these.
+  </para>
+   
+  <para>
+   By default, these files are expected to be
    named <filename>server.crt</filename> and <filename>server.key</filename>, respectively, in
    the server's data directory, but other names and locations can be specified
    using the configuration parameters <xref linkend="guc-ssl-cert-file"/>
@@ -2302,6 +2313,18 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
   </note>
   </sect2>
 
+  <sect2 id="ssl-nss-config">
+   <title>NSS Configuration</title>
+
+  <para>
+   <productname>PostgreSQL</productname> will look for certificates and keys
+   in the <productname>NSS</productname> database specified by the parameter
+   <xref linkend="guc-ssl-database"/> in <filename>postgresql.conf</filename>.
+   The parameters for certificate and key filenames are used to identify the
+   nicknames in the database.
+  </para>
+  </sect2>
+
   <sect2 id="ssl-client-certificates">
    <title>Using Client Certificates</title>
 
@@ -2376,7 +2399,7 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
   </sect2>
 
   <sect2 id="ssl-server-files">
-   <title>SSL Server File Usage</title>
+   <title>SSL Server File Parameter Usage</title>
 
    <para>
     <xref linkend="ssl-file-usage"/> summarizes the files that are
@@ -2423,6 +2446,14 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
       <entry>client certificate must not be on this list</entry>
      </row>
 
+     <row>
+      <entry><xref linkend="guc-ssl-database"/></entry>
+      <entry>certificate database</entry>
+      <entry>contains server certificates, keys and revocation lists; only
+      used when <productname>PostgreSQL</productname> is built with support
+      for <productname>NSS</productname>.</entry>
+     </row>
+
     </tbody>
    </tgroup>
   </table>
@@ -2446,7 +2477,7 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
   </sect2>
 
   <sect2 id="ssl-certificate-creation">
-   <title>Creating Certificates</title>
+   <title>Creating Certificates with OpenSSL</title>
 
    <para>
      To create a simple self-signed certificate for the server, valid for 365
@@ -2550,6 +2581,87 @@ openssl x509 -req -in server.csr -text -days 365 \
    </para>
   </sect2>
 
+  <sect2 id="nss-certificate-database">
+   <title>NSS Certificate Databases</title>
+
+   <para>
+    When using <productname>NSS</productname>, all certificates and keys must
+    be loaded into an <productname>NSS</productname> certificate database.
+   </para>
+
+   <para>
+    To create a new <productname>NSS</productname> certificate database and
+    load the certificates created in <xref linkend="ssl-certificate-creation" />,
+    use the following <productname>NSS</productname> commands:
+<programlisting>
+certutil -d "sql:server.db" -N --empty-password
+certutil -d "sql:server.db" -A -n server.crt -i server.crt -t "CT,C,C"
+certutil -d "sql:server.db" -A -n root.crt -i root.crt -t "CT,C,C"
+</programlisting>
+    This will give the certificate the filename as the nickname identifier in
+    the database which is created as <filename>server.db</filename>.
+   </para>
+   <para>
+    Then load the server key, which require converting it to
+    <acronym>PKCS#12</acronym> format using the
+    <productname>OpenSSL</productname> tools:
+<programlisting>
+openssl pkcs12 -export -out server.pfx -inkey server.key -in server.crt \
+  -certfile root.crt -passout pass:
+pk12util -i server.pfx -d server.db -W ''
+</programlisting>
+   </para>
+   <para>
+    Finally a certificate revocation list can be loaded with the following
+    commands:
+<programlisting>
+crlutil -I -i server.crl -d server.db -B
+</programlisting>
+   </para>
+  </sect2>
+
+  <sect2 id="nss-ssl-certificate-creation" />
+   <title>Creating Certificates with NSS</title>
+
+   <para>
+    To create a simple self-signed CA and certificate for the server, use the
+    following NSS commands. Replace
+    <replaceable>*.yourdomain.com</replaceable> with the server's host
+    name. Remove <replaceable>--empty-password</replaceable> in order to set
+    a password protecting the databases. The password can be passed to
+    <application>certutil</certutil> with the <literal>-f</literal> parameter.
+    First create a self-signed CA. To use a different certificate validity
+    time than the default, use <replaceable>-v</replaceable> to specify the
+    number of months of validity.
+<programlisting>
+mkdir root_ca.db
+certutil -N -d "sql:root_ca.db/" --empty-password
+certutil -S -d "sql:root_ca.db/" -n root_ca -s "CN=<replaceable>ca.yourdomain.com</replaceable>" \
+  -x -k rsa -g 2048 -m <replaceable>5432</replaceable> -t CTu,CTu,CTu \
+  --keyUsage certSigning -2 --nsCertType sslCA,smimeCA,objectSigningCA \
+  -Z SHA256
+certutil -L -d "sql:root_ca.db/" -n root_ca -a > root_ca.pem
+</programlisting>
+    Now create a server certificate database, and create a certificate signing
+    request for the CA. Then sign the request with the already created CA and
+    insert the certificate chain into the certificate database.
+<programlisting>
+mkdir server_cert.db
+certutil -N -d "sql:server_cert.db/" --empty-password
+certutil -R -d "sql:server_cert.db/" -s "CN=dbhost.yourdomain.com" \
+  -o server_cert.csr -g 2048 -Z SHA256
+
+certutil -C -d "sql:root_ca.db/" -c root_ca -i server_cert.csr \
+  -o server_cert.der -m <replaceable>5433</replaceable> --keyUsage keyEncipherment \
+  --nsCertType sslServer -Z SHA256
+
+certutil -A -d "sql:server_cert.db/" -n root_ca -t CTu,CTu,CTu -a -i root_ca.pem
+certutil -A -d "sql:server_cert.db/" -n server_cert -t CTu,CTu,CTu -i server_cert.der
+</programlisting>
+    The server certificate is loaded into the certificate database as well as
+    the CA certificate in order to provide the chain of certificates.
+  </sect2>
+
  </sect1>
 
  <sect1 id="gssapi-enc">
-- 
2.21.1 (Apple Git-122.3)

From 3ced800109354ac497581fee8539a0267401b626 Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Wed, 28 Oct 2020 11:34:37 +0100
Subject: [PATCH v21 5/6] NSS contrib modules

---
 contrib/Makefile            |   2 +-
 contrib/pgcrypto/Makefile   |   7 +-
 contrib/pgcrypto/nss.c      | 773 ++++++++++++++++++++++++++++++++++++
 contrib/sslinfo/sslinfo.c   |  32 ++
 doc/src/sgml/pgcrypto.sgml  |  38 +-
 doc/src/sgml/sslinfo.sgml   |  12 +-
 src/tools/msvc/Install.pm   |   3 +-
 src/tools/msvc/Mkvcbuild.pm |  12 +-
 8 files changed, 864 insertions(+), 15 deletions(-)
 create mode 100644 contrib/pgcrypto/nss.c

diff --git a/contrib/Makefile b/contrib/Makefile
index 7a4866e338..c2232e5a4d 100644
--- a/contrib/Makefile
+++ b/contrib/Makefile
@@ -52,7 +52,7 @@ SUBDIRS = \
 		unaccent	\
 		vacuumlo
 
-ifeq ($(with_openssl),yes)
+ifneq ($(with_ssl),no)
 SUBDIRS += sslinfo
 else
 ALWAYS_SUBDIRS += sslinfo
diff --git a/contrib/pgcrypto/Makefile b/contrib/pgcrypto/Makefile
index d881e85add..6f804bf032 100644
--- a/contrib/pgcrypto/Makefile
+++ b/contrib/pgcrypto/Makefile
@@ -7,11 +7,14 @@ INT_TESTS = sha2
 OSSL_SRCS = openssl.c pgp-mpi-openssl.c
 OSSL_TESTS = sha2 des 3des cast5
 
+NSS_SRCS = nss.c pgp-mpi-internal.c imath.c blf.c
+NSS_TESTS = sha2 des 3des
+
 ZLIB_TST = pgp-compression
 ZLIB_OFF_TST = pgp-zlib-DISABLED
 
-CF_SRCS = $(if $(subst no,,$(with_openssl)), $(OSSL_SRCS), $(INT_SRCS))
-CF_TESTS = $(if $(subst no,,$(with_openssl)), $(OSSL_TESTS), $(INT_TESTS))
+CF_SRCS = $(if $(findstring openssl, $(with_ssl)), $(OSSL_SRCS), $(if $(findstring nss, $(with_ssl)), $(NSS_SRCS), $(INT_SRCS)))
+CF_TESTS = $(if $(findstring openssl, $(with_ssl)), $(OSSL_TESTS), $(if $(findstring nss, $(with_ssl)), $(NSS_TESTS), $(INT_TESTS)))
 CF_PGP_TESTS = $(if $(subst no,,$(with_zlib)), $(ZLIB_TST), $(ZLIB_OFF_TST))
 
 SRCS = \
diff --git a/contrib/pgcrypto/nss.c b/contrib/pgcrypto/nss.c
new file mode 100644
index 0000000000..da66152d65
--- /dev/null
+++ b/contrib/pgcrypto/nss.c
@@ -0,0 +1,773 @@
+/*-------------------------------------------------------------------------
+ *
+ * nss.c
+ *	  Wrapper for using NSS as a backend for pgcrypto PX
+ *
+ *
+ * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ *	  contrib/pgcrypto/nss.c
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#include "postgres.h"
+
+#include "px.h"
+#include "blf.h"
+#include "utils/memutils.h"
+
+/*
+ * BITS_PER_BYTE is also defined in the NSPR header files, so we need to undef
+ * our version to avoid compiler warnings on redefinition.
+ */
+#define pg_BITS_PER_BYTE BITS_PER_BYTE
+#undef BITS_PER_BYTE
+
+#include <nss/nss.h>
+#include <nss/hasht.h>
+#include <nss/pk11func.h>
+#include <nss/pk11pub.h>
+#include <nss/secitem.h>
+#include <nss/sechash.h>
+#include <nss/secoid.h>
+#include <nss/secerr.h>
+
+/*
+ * Ensure that the colliding definitions match, else throw an error. In case
+ * NSPR has removed the definition for some reason, make sure to put ours
+ * back again.
+ */
+#if defined(BITS_PER_BYTE)
+#if BITS_PER_BYTE != pg_BITS_PER_BYTE
+#error "incompatible byte widths between NSPR and postgres"
+#endif
+#else
+#define BITS_PER_BYTE pg_BITS_PER_BYTE
+#endif
+#undef pg_BITS_PER_BYTE
+
+/*
+ * Define our own mechanisms for Blowfish as it's not implemented by NSS.
+ */
+#define BLOWFISH_CBC	(1)
+#define BLOWFISH_ECB	(2)
+
+/*
+ * Data structures for recording cipher implementations as well as ongoing
+ * cipher operations.
+ */
+typedef struct nss_digest
+{
+	NSSInitContext *context;
+	PK11Context *hash_context;
+	HASH_HashType hash_type;
+}			nss_digest;
+
+typedef struct cipher_implementation
+{
+	/* Function pointers to cipher operations */
+	int			(*init) (PX_Cipher *pxc, const uint8 *key, unsigned klen, const uint8 *iv);
+	unsigned	(*get_block_size) (PX_Cipher *pxc);
+	unsigned	(*get_key_size) (PX_Cipher *pxc);
+	unsigned	(*get_iv_size) (PX_Cipher *pxc);
+	int			(*encrypt) (PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res);
+	int			(*decrypt) (PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res);
+	void		(*free) (PX_Cipher *pxc);
+
+	/* The mechanism describing the cipher used */
+	union
+	{
+		CK_MECHANISM_TYPE nss;
+		CK_ULONG	internal;
+	}			mechanism;
+	int			keylen;
+	bool		is_nss;
+}			cipher_implementation;
+
+typedef struct nss_cipher
+{
+	const cipher_implementation *impl;
+	NSSInitContext *context;
+	PK11Context *crypt_context;
+	SECItem    *params;
+
+	PK11SymKey *encrypt_key;
+	PK11SymKey *decrypt_key;
+}			nss_cipher;
+
+typedef struct internal_cipher
+{
+	const cipher_implementation *impl;
+	BlowfishContext context;
+}			internal_cipher;
+
+typedef struct nss_cipher_ref
+{
+	const char *name;
+	const cipher_implementation *impl;
+}			nss_cipher_ref;
+
+/*
+ * Prototypes
+ */
+static unsigned nss_get_iv_size(PX_Cipher *pxc);
+static unsigned nss_get_block_size(PX_Cipher *pxc);
+
+/*
+ * nss_GetHashOidTagByHashType
+ *
+ * Returns the corresponding SECOidTag for the passed hash type. NSS 3.43
+ * includes HASH_GetHashOidTagByHashType for this purpose, but at the time of
+ * writing is not commonly available so we need our own version till then.
+ */
+static SECOidTag
+nss_GetHashOidTagByHashType(HASH_HashType type)
+{
+	if (type == HASH_AlgMD2)
+		return SEC_OID_MD2;
+	if (type == HASH_AlgMD5)
+		return SEC_OID_MD5;
+	if (type == HASH_AlgSHA1)
+		return SEC_OID_SHA1;
+	if (type == HASH_AlgSHA224)
+		return SEC_OID_SHA224;
+	if (type == HASH_AlgSHA256)
+		return SEC_OID_SHA256;
+	if (type == HASH_AlgSHA384)
+		return SEC_OID_SHA384;
+	if (type == HASH_AlgSHA512)
+		return SEC_OID_SHA512;
+
+	return SEC_OID_UNKNOWN;
+}
+
+static unsigned
+nss_digest_block_size(PX_MD *pxmd)
+{
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+	const SECHashObject *object;
+
+	object = HASH_GetHashObject(digest->hash_type);
+	return object->blocklength;
+}
+
+static unsigned
+nss_digest_result_size(PX_MD *pxmd)
+{
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+	const SECHashObject *object;
+
+	object = HASH_GetHashObject(digest->hash_type);
+	return object->length;
+}
+
+static void
+nss_digest_free(PX_MD *pxmd)
+{
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+	PRBool		free_ctx = PR_TRUE;
+
+	PK11_DestroyContext(digest->hash_context, free_ctx);
+	NSS_ShutdownContext(digest->context);
+}
+
+static void
+nss_digest_update(PX_MD *pxmd, const uint8 *data, unsigned dlen)
+{
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+
+	PK11_DigestOp(digest->hash_context, data, dlen);
+}
+
+static void
+nss_digest_reset(PX_MD *pxmd)
+{
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+
+	PK11_DigestBegin(digest->hash_context);
+}
+
+static void
+nss_digest_finish(PX_MD *pxmd, uint8 *dst)
+{
+	unsigned int outlen;
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+	const SECHashObject *object;
+
+	object = HASH_GetHashObject(digest->hash_type);
+	PK11_DigestFinal(digest->hash_context, dst, &outlen, object->length);
+}
+
+int
+px_find_digest(const char *name, PX_MD **res)
+{
+	PX_MD	   *pxmd;
+	NSSInitParameters params;
+	NSSInitContext *nss_context;
+	bool		found = false;
+	nss_digest *digest;
+	SECStatus	status;
+	SECOidData *hash;
+	HASH_HashType t;
+
+	/*
+	 * Initialize our own NSS context without a database backing it.
+	 */
+	memset(&params, 0, sizeof(params));
+	params.length = sizeof(params);
+	nss_context = NSS_InitContext("", "", "", "", &params,
+								  NSS_INIT_READONLY | NSS_INIT_NOCERTDB |
+								  NSS_INIT_NOMODDB | NSS_INIT_FORCEOPEN |
+								  NSS_INIT_NOROOTINIT | NSS_INIT_PK11RELOAD);
+
+	/*
+	 * There is no API function for looking up a digest algorithm from a name
+	 * string, but there is a publicly accessible array which can be scanned
+	 * for the name.
+	 */
+	for (t = HASH_AlgNULL + 1; t < HASH_AlgTOTAL; t++)
+	{
+		SECOidTag	hash_oid;
+		char	   *p;
+
+		hash_oid = nss_GetHashOidTagByHashType(t);
+
+		if (hash_oid == SEC_OID_UNKNOWN)
+			return PXE_NO_HASH;
+
+		hash = SECOID_FindOIDByTag(hash_oid);
+		if (pg_strcasecmp(hash->desc, name) == 0)
+		{
+			found = true;
+			break;
+		}
+
+		/*
+		 * NSS saves the algorithm names using SHA-xxx notation whereas
+		 * OpenSSL use SHAxxx. To make sure the user finds the requested
+		 * algorithm let's remove the dash and compare that spelling as well.
+		 */
+		if ((p = strchr(hash->desc, '-')) != NULL)
+		{
+			char		tmp[12];
+
+			memcpy(tmp, hash->desc, p - hash->desc);
+			memcpy(tmp + (p - hash->desc), p + 1, strlen(hash->desc) - (p - hash->desc) + 1);
+			if (pg_strcasecmp(tmp, name) == 0)
+			{
+				found = true;
+				break;
+			}
+		}
+	}
+
+	if (!found)
+		return PXE_NO_HASH;
+
+	digest = palloc(sizeof(*digest));
+
+	digest->context = nss_context;
+	digest->hash_context = PK11_CreateDigestContext(hash->offset);
+	digest->hash_type = t;
+	if (digest->hash_context == NULL)
+	{
+		pfree(digest);
+		return -1;
+	}
+
+	status = PK11_DigestBegin(digest->hash_context);
+	if (status != SECSuccess)
+	{
+		PK11_DestroyContext(digest->hash_context, PR_TRUE);
+		pfree(digest);
+		return -1;
+	}
+
+	pxmd = palloc(sizeof(*pxmd));
+	pxmd->result_size = nss_digest_result_size;
+	pxmd->block_size = nss_digest_block_size;
+	pxmd->reset = nss_digest_reset;
+	pxmd->update = nss_digest_update;
+	pxmd->finish = nss_digest_finish;
+	pxmd->free = nss_digest_free;
+	pxmd->p.ptr = (void *) digest;
+
+	*res = pxmd;
+
+	return 0;
+}
+
+static int
+bf_init(PX_Cipher *pxc, const uint8 *key, unsigned klen, const uint8 *iv)
+{
+	internal_cipher *cipher = (internal_cipher *) pxc->ptr;
+
+	blowfish_setkey(&cipher->context, key, klen);
+	if (iv)
+		blowfish_setiv(&cipher->context, iv);
+
+	return 0;
+}
+
+static int
+bf_encrypt(PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res)
+{
+	internal_cipher *cipher = (internal_cipher *) pxc->ptr;
+	uint8	   *buf;
+
+	if (dlen == 0)
+		return 0;
+
+	if (dlen & 7)
+		return PXE_NOTBLOCKSIZE;
+
+	buf = palloc(dlen);
+	memcpy(buf, data, dlen);
+
+	if (cipher->impl->mechanism.internal == BLOWFISH_ECB)
+		blowfish_encrypt_ecb(buf, dlen, &cipher->context);
+	else
+		blowfish_encrypt_cbc(buf, dlen, &cipher->context);
+
+	memcpy(res, buf, dlen);
+	pfree(buf);
+
+	return 0;
+}
+
+static int
+bf_decrypt(PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res)
+{
+	internal_cipher *cipher = (internal_cipher *) pxc->ptr;
+
+	if (dlen == 0)
+		return 0;
+
+	if (dlen & 7)
+		return PXE_NOTBLOCKSIZE;
+
+	memcpy(res, data, dlen);
+	if (cipher->impl->mechanism.internal == BLOWFISH_ECB)
+		blowfish_decrypt_ecb(res, dlen, &cipher->context);
+	else
+		blowfish_decrypt_cbc(res, dlen, &cipher->context);
+
+	return 0;
+}
+
+static void
+bf_free(PX_Cipher *pxc)
+{
+	internal_cipher *cipher = (internal_cipher *) pxc->ptr;
+
+	pfree(cipher);
+	pfree(pxc);
+}
+
+static int
+nss_symkey_blockcipher_init(PX_Cipher *pxc, const uint8 *key, unsigned klen,
+							const uint8 *iv)
+{
+	nss_cipher *cipher = (nss_cipher *) pxc->ptr;
+	SECItem		iv_item;
+	unsigned char *iv_item_data;
+	SECItem		key_item;
+	int			keylen;
+	PK11SlotInfo *slot;
+
+	if (cipher->impl->mechanism.nss == CKM_AES_CBC ||
+		cipher->impl->mechanism.nss == CKM_AES_ECB)
+	{
+		if (klen <= 128 / 8)
+			keylen = 128 / 8;
+		else if (klen <= 192 / 8)
+			keylen = 192 / 8;
+		else if (klen <= 256 / 8)
+			keylen = 256 / 8;
+		else
+			return PXE_CIPHER_INIT;
+	}
+	else
+		keylen = cipher->impl->keylen;
+
+	key_item.type = siBuffer;
+	key_item.data = (unsigned char *) key;
+	key_item.len = keylen;
+
+	/*
+	 * If hardware acceleration is configured in NSS one can theoretically get
+	 * a better slot by calling PK11_GetBestSlot() with the mechanism passed
+	 * to it. Unless there are complaints, using the simpler API will make
+	 * error handling easier though.
+	 */
+	slot = PK11_GetInternalSlot();
+	if (!slot)
+		return PXE_CIPHER_INIT;
+
+	/*
+	 * The key must be set up for the operation, and since we don't know at
+	 * this point whether we are asked to encrypt or decrypt we need to store
+	 * both versions.
+	 */
+	cipher->decrypt_key = PK11_ImportSymKey(slot, cipher->impl->mechanism.nss,
+											PK11_OriginUnwrap,
+											CKA_DECRYPT, &key_item,
+											NULL);
+	cipher->encrypt_key = PK11_ImportSymKey(slot, cipher->impl->mechanism.nss,
+											PK11_OriginUnwrap,
+											CKA_ENCRYPT, &key_item,
+											NULL);
+	PK11_FreeSlot(slot);
+
+	if (!cipher->decrypt_key || !cipher->encrypt_key)
+		return PXE_CIPHER_INIT;
+
+	if (iv)
+	{
+		iv_item.type = siBuffer;
+		iv_item.data = (unsigned char *) iv;
+		iv_item.len = nss_get_iv_size(pxc);
+	}
+	else
+	{
+		/*
+		 * The documentation states that either passing .data = 0; .len = 0;
+		 * in the iv_item, or NULL as iv_item, to PK11_ParamFromIV should be
+		 * done when IV is missing. That however leads to segfaults in the
+		 * library, the workaround that works in modern  library versions is
+		 * to pass in a keysized zeroed out IV.
+		 */
+		iv_item_data = palloc0(nss_get_iv_size(pxc));
+		iv_item.type = siBuffer;
+		iv_item.data = iv_item_data;
+		iv_item.len = nss_get_iv_size(pxc);
+	}
+
+	cipher->params = PK11_ParamFromIV(cipher->impl->mechanism.nss, &iv_item);
+
+	/* If we had to make a mock IV, free it once made into a param */
+	if (!iv)
+		pfree(iv_item_data);
+
+	if (cipher->params == NULL)
+		return PXE_CIPHER_INIT;
+
+	return 0;
+}
+
+static int
+nss_decrypt(PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res)
+{
+	nss_cipher *cipher = (nss_cipher *) pxc->ptr;
+	SECStatus	status;
+	int			outlen;
+
+	if (!cipher->crypt_context)
+	{
+		cipher->crypt_context =
+			PK11_CreateContextBySymKey(cipher->impl->mechanism.nss, CKA_DECRYPT,
+									   cipher->decrypt_key, cipher->params);
+	}
+
+	status = PK11_CipherOp(cipher->crypt_context, res, &outlen, dlen, data, dlen);
+	if (status != SECSuccess)
+		return PXE_DECRYPT_FAILED;
+
+	return 0;
+}
+
+static int
+nss_encrypt(PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res)
+{
+	nss_cipher *cipher = (nss_cipher *) pxc->ptr;
+	SECStatus	status;
+	int			outlen;
+
+	if (!cipher->crypt_context)
+	{
+		cipher->crypt_context =
+			PK11_CreateContextBySymKey(cipher->impl->mechanism.nss, CKA_ENCRYPT,
+									   cipher->decrypt_key, cipher->params);
+	}
+
+	status = PK11_CipherOp(cipher->crypt_context, res, &outlen, dlen, data, dlen);
+
+	if (status != SECSuccess)
+		return PXE_DECRYPT_FAILED;
+
+	return 0;
+}
+
+static void
+nss_free(PX_Cipher *pxc)
+{
+	nss_cipher *cipher = pxc->ptr;
+	PRBool		free_ctx = PR_TRUE;
+
+	PK11_FreeSymKey(cipher->encrypt_key);
+	PK11_FreeSymKey(cipher->decrypt_key);
+	PK11_DestroyContext(cipher->crypt_context, free_ctx);
+	NSS_ShutdownContext(cipher->context);
+	pfree(cipher);
+
+	pfree(pxc);
+}
+
+static unsigned
+nss_get_block_size(PX_Cipher *pxc)
+{
+	nss_cipher *cipher = pxc->ptr;
+
+	return PK11_GetBlockSize(cipher->impl->mechanism.nss, NULL);
+}
+
+static unsigned
+nss_get_key_size(PX_Cipher *pxc)
+{
+	nss_cipher *cipher = pxc->ptr;
+
+	return cipher->impl->keylen;
+}
+
+static unsigned
+nss_get_iv_size(PX_Cipher *pxc)
+{
+	nss_cipher *cipher = pxc->ptr;
+
+	return PK11_GetIVLength(cipher->impl->mechanism.nss);
+}
+
+static unsigned
+bf_get_block_size(PX_Cipher *pxc)
+{
+	return 8;
+}
+
+static unsigned
+bf_get_key_size(PX_Cipher *pxc)
+{
+	return 448 / 8;
+}
+
+static unsigned
+bf_get_iv_size(PX_Cipher *pxc)
+{
+	return 8;
+}
+
+/*
+ * Cipher Implementations
+ */
+static const cipher_implementation nss_des_cbc = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_DES_CBC,
+	.keylen = 8,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_des_ecb = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_DES_ECB,
+	.keylen = 8,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_des3_cbc = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_DES3_CBC,
+	.keylen = 24,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_des3_ecb = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_DES3_ECB,
+	.keylen = 24,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_aes_cbc = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_AES_CBC,
+	.keylen = 32,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_aes_ecb = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_AES_ECB,
+	.keylen = 32,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_bf_ecb = {
+	.init = bf_init,
+	.get_block_size = bf_get_block_size,
+	.get_key_size = bf_get_key_size,
+	.get_iv_size = bf_get_iv_size,
+	.encrypt = bf_encrypt,
+	.decrypt = bf_decrypt,
+	.free = bf_free,
+	.mechanism.internal = BLOWFISH_ECB,
+	.keylen = 56,
+	.is_nss = false
+};
+
+static const cipher_implementation nss_bf_cbc = {
+	.init = bf_init,
+	.get_block_size = bf_get_block_size,
+	.get_key_size = bf_get_key_size,
+	.get_iv_size = bf_get_iv_size,
+	.encrypt = bf_encrypt,
+	.decrypt = bf_decrypt,
+	.free = bf_free,
+	.mechanism.internal = BLOWFISH_CBC,
+	.keylen = 56,
+	.is_nss = false
+};
+
+/*
+ * Lookup table for finding the implementation based on a name. CAST5 as well
+ * as BLOWFISH are defined as cipher mechanisms in NSS but error out with
+ * SEC_ERROR_INVALID_ALGORITHM. Blowfish is implemented using the internal
+ * implementation while CAST5 isn't supported at all at this time,
+ */
+static const nss_cipher_ref nss_cipher_lookup[] = {
+	{"des", &nss_des_cbc},
+	{"des-cbc", &nss_des_cbc},
+	{"des-ecb", &nss_des_ecb},
+	{"des3-cbc", &nss_des3_cbc},
+	{"3des", &nss_des3_cbc},
+	{"3des-cbc", &nss_des3_cbc},
+	{"des3-ecb", &nss_des3_ecb},
+	{"3des-ecb", &nss_des3_ecb},
+	{"aes", &nss_aes_cbc},
+	{"aes-cbc", &nss_aes_cbc},
+	{"aes-ecb", &nss_aes_ecb},
+	{"rijndael", &nss_aes_cbc},
+	{"rijndael-cbc", &nss_aes_cbc},
+	{"rijndael-ecb", &nss_aes_ecb},
+	{"blowfish", &nss_bf_cbc},
+	{"blowfish-cbc", &nss_bf_cbc},
+	{"blowfish-ecb", &nss_bf_ecb},
+	{"bf", &nss_bf_cbc},
+	{"bf-cbc", &nss_bf_cbc},
+	{"bf-ecb", &nss_bf_ecb},
+	{NULL}
+};
+
+/*
+ * px_find_cipher
+ *
+ * Search for the requested cipher and see if there is support for it, and if
+ * so return an allocated object containing the playbook for how to encrypt
+ * and decrypt using the cipher.
+ */
+int
+px_find_cipher(const char *alias, PX_Cipher **res)
+{
+	const nss_cipher_ref *cipher_ref;
+	PX_Cipher  *px_cipher;
+	NSSInitParameters params;
+	NSSInitContext *nss_context;
+	nss_cipher *cipher;
+	internal_cipher *int_cipher;
+
+	for (cipher_ref = nss_cipher_lookup; cipher_ref->name; cipher_ref++)
+	{
+		if (strcmp(cipher_ref->name, alias) == 0)
+			break;
+	}
+
+	if (!cipher_ref->name)
+		return PXE_NO_CIPHER;
+
+	/*
+	 * Fill in the PX_Cipher to pass back to PX describing the operations to
+	 * perform in order to use the cipher.
+	 */
+	px_cipher = palloc(sizeof(*px_cipher));
+	px_cipher->block_size = cipher_ref->impl->get_block_size;
+	px_cipher->key_size = cipher_ref->impl->get_key_size;
+	px_cipher->iv_size = cipher_ref->impl->get_iv_size;
+	px_cipher->free = cipher_ref->impl->free;
+	px_cipher->init = cipher_ref->impl->init;
+	px_cipher->encrypt = cipher_ref->impl->encrypt;
+	px_cipher->decrypt = cipher_ref->impl->decrypt;
+
+	/*
+	 * Set the private data, which is different for NSS and internal ciphers
+	 */
+	if (cipher_ref->impl->is_nss)
+	{
+		/*
+		 * Initialize our own NSS context without a database backing it. At
+		 * some point we might want to allow users to use stored keys in the
+		 * database rather than passing them via SELECT encrypt(), and then
+		 * this need to be changed to open a user specified database.
+		 */
+		memset(&params, 0, sizeof(params));
+		params.length = sizeof(params);
+		nss_context = NSS_InitContext("", "", "", "", &params,
+									  NSS_INIT_READONLY | NSS_INIT_NOCERTDB |
+									  NSS_INIT_NOMODDB | NSS_INIT_FORCEOPEN |
+									  NSS_INIT_NOROOTINIT | NSS_INIT_PK11RELOAD);
+
+		/* nss_cipher is the private state struct for the operation */
+		cipher = palloc(sizeof(*cipher));
+		cipher->context = nss_context;
+		cipher->impl = cipher_ref->impl;
+		cipher->crypt_context = NULL;
+
+		px_cipher->ptr = cipher;
+	}
+	else
+	{
+		int_cipher = palloc0(sizeof(*int_cipher));
+
+		int_cipher->impl = cipher_ref->impl;
+		px_cipher->ptr = int_cipher;
+	}
+
+	*res = px_cipher;
+	return 0;
+}
diff --git a/contrib/sslinfo/sslinfo.c b/contrib/sslinfo/sslinfo.c
index 30cae0bb98..3aadd90aa6 100644
--- a/contrib/sslinfo/sslinfo.c
+++ b/contrib/sslinfo/sslinfo.c
@@ -9,9 +9,11 @@
 
 #include "postgres.h"
 
+#ifdef USE_OPENSSL
 #include <openssl/x509.h>
 #include <openssl/x509v3.h>
 #include <openssl/asn1.h>
+#endif
 
 #include "access/htup_details.h"
 #include "funcapi.h"
@@ -21,6 +23,7 @@
 
 PG_MODULE_MAGIC;
 
+#ifdef USE_OPENSSL
 static Datum X509_NAME_field_to_text(X509_NAME *name, text *fieldName);
 static Datum ASN1_STRING_to_text(ASN1_STRING *str);
 
@@ -31,6 +34,7 @@ typedef struct
 {
 	TupleDesc	tupdesc;
 } SSLExtensionInfoContext;
+#endif
 
 /*
  * Indicates whether current session uses SSL
@@ -131,6 +135,7 @@ ssl_client_serial(PG_FUNCTION_ARGS)
 }
 
 
+#ifdef USE_OPENSSL
 /*
  * Converts OpenSSL ASN1_STRING structure into text
  *
@@ -282,7 +287,23 @@ ssl_issuer_field(PG_FUNCTION_ARGS)
 	else
 		return result;
 }
+#endif							/* USE_OPENSSL */
 
+#ifdef USE_NSS
+PG_FUNCTION_INFO_V1(ssl_client_dn_field);
+Datum
+ssl_client_dn_field(PG_FUNCTION_ARGS)
+{
+	PG_RETURN_NULL();
+}
+
+PG_FUNCTION_INFO_V1(ssl_issuer_field);
+Datum
+ssl_issuer_field(PG_FUNCTION_ARGS)
+{
+	PG_RETURN_NULL();
+}
+#endif							/* USE_NSS */
 
 /*
  * Returns current client certificate subject as one string
@@ -338,6 +359,7 @@ ssl_issuer_dn(PG_FUNCTION_ARGS)
 }
 
 
+#ifdef USE_OPENSSL
 /*
  * Returns information about available SSL extensions.
  *
@@ -471,3 +493,13 @@ ssl_extension_info(PG_FUNCTION_ARGS)
 	/* All done */
 	SRF_RETURN_DONE(funcctx);
 }
+#endif							/* USE_OPENSSL */
+
+#ifdef USE_NSS
+PG_FUNCTION_INFO_V1(ssl_extension_info);
+Datum
+ssl_extension_info(PG_FUNCTION_ARGS)
+{
+	PG_RETURN_NULL();
+}
+#endif							/* USE_NSS */
diff --git a/doc/src/sgml/pgcrypto.sgml b/doc/src/sgml/pgcrypto.sgml
index 3d74e15ec9..9eb8a3f74d 100644
--- a/doc/src/sgml/pgcrypto.sgml
+++ b/doc/src/sgml/pgcrypto.sgml
@@ -45,8 +45,9 @@ digest(data bytea, type text) returns bytea
     <literal>sha224</literal>, <literal>sha256</literal>,
     <literal>sha384</literal> and <literal>sha512</literal>.
     If <filename>pgcrypto</filename> was built with
-    <productname>OpenSSL</productname>, more algorithms are available, as
-    detailed in <xref linkend="pgcrypto-with-without-openssl"/>.
+    <productname>OpenSSL</productname> or <productname>NSS</productname>,
+    more algorithms are available, as
+    detailed in <xref linkend="pgcrypto-with-without-openssl-nss"/>.
    </para>
 
    <para>
@@ -764,7 +765,7 @@ pgp_sym_encrypt(data, psw, 'compress-algo=1, cipher-algo=aes256')
     Which cipher algorithm to use.
    </para>
 <literallayout>
-Values: bf, aes128, aes192, aes256 (OpenSSL-only: <literal>3des</literal>, <literal>cast5</literal>)
+Values: bf, aes128, aes192, aes256 (OpenSSL-only: <literal>3des</literal>, <literal>cast5</literal>; NSS-only: <literal>3des</literal>)
 Default: aes128
 Applies to: pgp_sym_encrypt, pgp_pub_encrypt
 </literallayout>
@@ -1153,8 +1154,8 @@ gen_random_uuid() returns uuid
    <para>
     <filename>pgcrypto</filename> configures itself according to the findings of the
     main PostgreSQL <literal>configure</literal> script.  The options that
-    affect it are <literal>--with-zlib</literal> and
-    <literal>--with-openssl</literal>.
+    affect it are <literal>--with-zlib</literal>,
+    <literal>--with-openssl</literal> and <literal>--with-nss</literal>.
    </para>
 
    <para>
@@ -1169,14 +1170,16 @@ gen_random_uuid() returns uuid
     BIGNUM functions.
    </para>
 
-   <table id="pgcrypto-with-without-openssl">
-    <title>Summary of Functionality with and without OpenSSL</title>
-    <tgroup cols="3">
+   <table id="pgcrypto-with-without-openssl-nss">
+    <title>Summary of Functionality with and without external cryptographic
+      library</title>
+    <tgroup cols="4">
      <thead>
       <row>
        <entry>Functionality</entry>
        <entry>Built-in</entry>
        <entry>With OpenSSL</entry>
+       <entry>With NSS</entry>
       </row>
      </thead>
      <tbody>
@@ -1184,51 +1187,67 @@ gen_random_uuid() returns uuid
        <entry>MD5</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>SHA1</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>SHA224/256/384/512</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>Other digest algorithms</entry>
        <entry>no</entry>
        <entry>yes (Note 1)</entry>
+       <entry>yes (Note 1)</entry>
       </row>
       <row>
        <entry>Blowfish</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>AES</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>DES/3DES/CAST5</entry>
        <entry>no</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
+      </row>
+      <row>
+       <entry>CAST5</entry>
+       <entry>no</entry>
+       <entry>yes</entry>
+       <entry>no</entry>
       </row>
       <row>
        <entry>Raw encryption</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>PGP Symmetric encryption</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>PGP Public-Key encryption</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
      </tbody>
     </tgroup>
@@ -1241,7 +1260,8 @@ gen_random_uuid() returns uuid
    <orderedlist>
     <listitem>
      <para>
-      Any digest algorithm <productname>OpenSSL</productname> supports
+      Any digest algorithm <productname>OpenSSL</productname> and
+      <productname>NSS</productname> supports
       is automatically picked up.
       This is not possible with ciphers, which need to be supported
       explicitly.
diff --git a/doc/src/sgml/sslinfo.sgml b/doc/src/sgml/sslinfo.sgml
index 3213c039ca..d2270cbe7c 100644
--- a/doc/src/sgml/sslinfo.sgml
+++ b/doc/src/sgml/sslinfo.sgml
@@ -22,7 +22,8 @@
 
  <para>
   This extension won't build at all unless the installation was
-  configured with <literal>--with-openssl</literal>.
+  configured with SSL support, such as <literal>--with-openssl</literal>
+  or <literal>--with-nss</literal>.
  </para>
 
  <sect2>
@@ -208,6 +209,9 @@ emailAddress
      the X.500 and X.509 standards, so you cannot just assign arbitrary
      meaning to them.
     </para>
+    <para>
+     This function is only available when using <productname>OpenSSL</productname>.
+    </para>
     </listitem>
    </varlistentry>
 
@@ -223,6 +227,9 @@ emailAddress
      Same as <function>ssl_client_dn_field</function>, but for the certificate issuer
      rather than the certificate subject.
     </para>
+    <para>
+     This function is only available when using <productname>OpenSSL</productname>.
+    </para>
     </listitem>
    </varlistentry>
 
@@ -238,6 +245,9 @@ emailAddress
      Provide information about extensions of client certificate: extension name,
      extension value, and if it is a critical extension.
     </para>
+    <para>
+     This function is only available when using <productname>OpenSSL</productname>.
+    </para>
     </listitem>
    </varlistentry>
   </variablelist>
diff --git a/src/tools/msvc/Install.pm b/src/tools/msvc/Install.pm
index ea3af48777..afe72a7e97 100644
--- a/src/tools/msvc/Install.pm
+++ b/src/tools/msvc/Install.pm
@@ -438,7 +438,8 @@ sub CopyContribFiles
 		{
 			# These configuration-based exclusions must match vcregress.pl
 			next if ($d eq "uuid-ossp"  && !defined($config->{uuid}));
-			next if ($d eq "sslinfo"    && !defined($config->{openssl}));
+			next if ($d eq "sslinfo"    && !defined($config->{openssl})
+			  && !defined($config->{nss}));
 			next if ($d eq "xml2"       && !defined($config->{xml}));
 			next if ($d =~ /_plperl$/   && !defined($config->{perl}));
 			next if ($d =~ /_plpython$/ && !defined($config->{python}));
diff --git a/src/tools/msvc/Mkvcbuild.pm b/src/tools/msvc/Mkvcbuild.pm
index a21eb088b3..0c489f9f34 100644
--- a/src/tools/msvc/Mkvcbuild.pm
+++ b/src/tools/msvc/Mkvcbuild.pm
@@ -444,9 +444,14 @@ sub mkvcbuild
 		push @contrib_excludes, 'xml2';
 	}
 
+	if (!$solution->{options}->{openssl} && !$solution->{options}->{nss})
+	{
+		push @contrib_excludes, 'sslinfo';
+	}
+
 	if (!$solution->{options}->{openssl})
 	{
-		push @contrib_excludes, 'sslinfo', 'ssl_passphrase_callback';
+		push @contrib_excludes, 'ssl_passphrase_callback';
 	}
 
 	if (!$solution->{options}->{uuid})
@@ -476,6 +481,11 @@ sub mkvcbuild
 		$pgcrypto->AddFiles('contrib/pgcrypto', 'openssl.c',
 			'pgp-mpi-openssl.c');
 	}
+	elsif ($solution->{options}->{nss})
+	{
+		$pgcrypto->AddFiles('contrib/pgcrypto', 'nss.c',
+			'pgp-mpi-internal.c', 'imath.c', 'blf.c');
+	}
 	else
 	{
 		$pgcrypto->AddFiles(
-- 
2.21.1 (Apple Git-122.3)

From 21f989bb9083f867446c0e964a13a6553adf6f75 Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Mon, 18 Jan 2021 13:04:49 +0100
Subject: [PATCH v21 6/6] NSS cryptohash support

---
 src/common/Makefile         |   5 +
 src/common/cryptohash_nss.c | 243 ++++++++++++++++++++++++++++++++++++
 2 files changed, 248 insertions(+)
 create mode 100644 src/common/cryptohash_nss.c

diff --git a/src/common/Makefile b/src/common/Makefile
index 7a4b3dad5d..5a25e5b390 100644
--- a/src/common/Makefile
+++ b/src/common/Makefile
@@ -85,11 +85,16 @@ OBJS_COMMON += \
 	protocol_openssl.o \
 	cryptohash_openssl.o
 else
+ifeq ($(with_ssl),nss)
+OBJS_COMMON += \
+	cryptohash_nss.o
+else
 OBJS_COMMON += \
 	cryptohash.o \
 	md5.o \
 	sha2.o
 endif
+endif
 
 # A few files are currently only built for frontend, not server
 # (Mkvcbuild.pm has a copy of this list, too).  logging.c is excluded
diff --git a/src/common/cryptohash_nss.c b/src/common/cryptohash_nss.c
new file mode 100644
index 0000000000..9cd9c9f3f3
--- /dev/null
+++ b/src/common/cryptohash_nss.c
@@ -0,0 +1,243 @@
+/*-------------------------------------------------------------------------
+ *
+ * cryptohash_nss.c
+ *	  Set of wrapper routines on top of NSS to support cryptographic
+ *	  hash functions.
+ *
+ * This should only be used if code is compiled with NSS support.
+ *
+ * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ *		  src/common/cryptohash_nss.c
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#ifndef FRONTEND
+#include "postgres.h"
+#else
+#include "postgres_fe.h"
+#endif
+
+/*
+ * BITS_PER_BYTE is also defined in the NSPR header files, so we need to undef
+ * our version to avoid compiler warnings on redefinition.
+ */
+#define pg_BITS_PER_BYTE BITS_PER_BYTE
+#undef BITS_PER_BYTE
+
+#include <nss/nss.h>
+#include <nss/hasht.h>
+#include <nss/pk11func.h>
+#include <nss/pk11pub.h>
+#include <nss/secitem.h>
+#include <nss/sechash.h>
+#include <nss/secoid.h>
+#include <nss/secerr.h>
+
+/*
+ * Ensure that the colliding definitions match, else throw an error. In case
+ * NSPR has removed the definition for some reason, make sure to put ours
+ * back again.
+ */
+#if defined(BITS_PER_BYTE)
+#if BITS_PER_BYTE != pg_BITS_PER_BYTE
+#error "incompatible byte widths between NSPR and postgres"
+#endif
+#else
+#define BITS_PER_BYTE pg_BITS_PER_BYTE
+#endif
+#undef pg_BITS_PER_BYTE
+
+#include "common/cryptohash.h"
+#ifndef FRONTEND
+#include "utils/memutils.h"
+#include "utils/resowner.h"
+#include "utils/resowner_private.h"
+#endif
+
+/*
+ * Internal pg_cryptohash_ctx structure.
+ */
+struct pg_cryptohash_ctx
+{
+	pg_cryptohash_type type;
+
+	NSSInitContext *nss_context;
+	PK11Context *pk11_context;
+	HASH_HashType hash_type;
+
+#ifndef FRONTEND
+	ResourceOwner resowner;
+#endif
+};
+
+/*
+ * pg_cryptohash_create
+ *
+ * Create and allocate a new hash context. Returns NULL on failure in the
+ * frontend, and raise error without returning in the backend.
+ */
+pg_cryptohash_ctx *
+pg_cryptohash_create(pg_cryptohash_type type)
+{
+	NSSInitParameters params;
+	pg_cryptohash_ctx *ctx;
+	SECOidData *hash;
+
+#ifndef FRONTEND
+	/*
+	 * Make sure that the resource owner has space to remember this reference.
+	 * This can error out with "out of memory", so do this before any other
+	 * allocation to avoid leaking.
+	 */
+	ResourceOwnerEnlargeCryptoHash(CurrentResourceOwner);
+	ctx = MemoryContextAlloc(TopMemoryContext, sizeof(pg_cryptohash_ctx));
+#else
+	ctx = pg_malloc(sizeof(pg_cryptohash_ctx));
+#endif
+
+	if (!ctx)
+		goto error;
+
+	switch(type)
+	{
+		case PG_MD5:
+			ctx->hash_type = SEC_OID_MD5;
+			break;
+		case PG_SHA224:
+			ctx->hash_type = SEC_OID_SHA224;
+			break;
+		case PG_SHA256:
+			ctx->hash_type = SEC_OID_SHA256;
+			break;
+		case PG_SHA384:
+			ctx->hash_type = SEC_OID_SHA384;
+			break;
+		case PG_SHA512:
+			ctx->hash_type = SEC_OID_SHA512;
+			break;
+	}
+
+	/*
+	 * Initialize our own NSS context without a database backing it.
+	 */
+	memset(&params, 0, sizeof(params));
+	params.length = sizeof(params);
+	ctx->nss_context = NSS_InitContext("", "", "", "", &params,
+									   NSS_INIT_READONLY | NSS_INIT_NOCERTDB |
+									   NSS_INIT_NOMODDB | NSS_INIT_FORCEOPEN |
+									   NSS_INIT_NOROOTINIT | NSS_INIT_PK11RELOAD);
+	if (!ctx->nss_context)
+	{
+		explicit_bzero(ctx, sizeof(pg_cryptohash_ctx));
+		pfree(ctx);
+		goto error;
+	}
+	ctx->type = type;
+	hash = SECOID_FindOIDByTag(ctx->hash_type);
+	ctx->pk11_context = PK11_CreateDigestContext(hash->offset);
+	if (!ctx->pk11_context)
+	{
+		explicit_bzero(ctx, sizeof(pg_cryptohash_ctx));
+		pfree(ctx);
+		goto error;
+	}
+
+#ifndef FRONTEND
+	ctx->resowner = CurrentResourceOwner;
+	ResourceOwnerRememberCryptoHash(CurrentResourceOwner,
+									PointerGetDatum(ctx));
+#endif
+
+	return ctx;
+
+error:
+#ifndef FRONTEND
+	ereport(ERROR,
+			(errcode(ERRCODE_OUT_OF_MEMORY),
+			 errmsg("out of memory")));
+#endif
+	return NULL;
+}
+
+/*
+ * pg_cryptohash_init
+ *			Initialize the passed hash context
+ *
+ * Returns 0 on success, -1 on failure.
+ */
+int
+pg_cryptohash_init(pg_cryptohash_ctx *ctx)
+{
+	SECStatus		status;
+
+	status = PK11_DigestBegin(ctx->pk11_context);
+
+	if (status != SECSuccess)
+		return 1;
+	return 0;
+}
+
+/*
+ * pg_cryptohash_update
+ *
+ * Update a hash context.  Returns 0 on success, -1 on failure.
+ */
+int
+pg_cryptohash_update(pg_cryptohash_ctx *ctx, const uint8 *data, size_t len)
+{
+	SECStatus	status;
+
+	if (ctx == NULL)
+		return -1;
+	
+	status = PK11_DigestOp(ctx->pk11_context, data, len);
+	if (status != SECSuccess)
+		return -1;
+	
+	return 0;
+}
+
+/*
+ * pg_cryptohash_final
+ *
+ * Finalize a hash context.  Returns 0 on success, -1 on failure.
+ */
+int
+pg_cryptohash_final(pg_cryptohash_ctx *ctx, uint8 *dest)
+{
+	SECStatus	status;
+	unsigned int outlen;
+	const SECHashObject *object;
+
+	object = HASH_GetHashObject(ctx->hash_type);
+	status = PK11_DigestFinal(ctx->pk11_context, dest, &outlen, object->length);
+
+	if (status != SECSuccess)
+		return -1;
+	return 0;
+}
+
+/*
+ * pg_cryptohash_free
+ *
+ * Free a hash context and the associated NSS context.
+ */
+void
+pg_cryptohash_free(pg_cryptohash_ctx *ctx)
+{
+	PRBool		free_context = PR_TRUE;
+	if (!ctx)
+		return;
+	
+	PK11_DestroyContext(ctx->pk11_context, free_context);
+#ifndef FRONTEND
+	ResourceOwnerForgetCryptoHash(ctx->resowner, PointerGetDatum(ctx));
+#endif
+	NSS_ShutdownContext(ctx->nss_context);
+	explicit_bzero(ctx, sizeof(pg_cryptohash_ctx));
+	pfree(ctx);
+}
-- 
2.21.1 (Apple Git-122.3)

From 3639ce7798695f32f9950a09b3a6a9a9b1ad90e3 Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Wed, 28 Oct 2020 11:18:42 +0100
Subject: [PATCH v22 1/6] NSS Frontend, Backend and build infrastructure

TODO:
	* SCRAM channel binding is implemented but doesn't work
	* Frontend CRL configuration handling
	* Settle on a required version in autoconf
	* Move pg_nss.h to a .c file for both frontend and backend

Daniel Gustafsson, Andrew Dunstan, Jacob Champion
---
 configure                                     |  422 +++++-
 configure.ac                                  |   56 +-
 .../postgres_fdw/expected/postgres_fdw.out    |    2 +-
 src/Makefile.global.in                        |    2 +-
 src/backend/libpq/Makefile                    |    6 +-
 src/backend/libpq/auth.c                      |    7 +
 src/backend/libpq/be-secure-nss.c             | 1265 +++++++++++++++++
 src/backend/libpq/be-secure.c                 |    3 +
 src/backend/libpq/hba.c                       |    2 +-
 src/backend/utils/misc/guc.c                  |   20 +-
 src/common/Makefile                           |    2 +-
 src/include/common/pg_nss.h                   |  175 +++
 src/include/libpq/libpq-be.h                  |   15 +-
 src/include/libpq/libpq.h                     |    3 +
 src/include/pg_config.h.in                    |    3 +
 src/include/pg_config_manual.h                |    5 +-
 src/interfaces/libpq/Makefile                 |   13 +-
 src/interfaces/libpq/fe-connect.c             |    4 +
 src/interfaces/libpq/fe-secure-nss.c          | 1112 +++++++++++++++
 src/interfaces/libpq/fe-secure.c              |    5 +-
 src/interfaces/libpq/libpq-fe.h               |   13 +-
 src/interfaces/libpq/libpq-int.h              |   20 +-
 src/tools/msvc/Mkvcbuild.pm                   |   22 +-
 src/tools/msvc/Solution.pm                    |   20 +
 src/tools/msvc/config_default.pl              |    1 +
 25 files changed, 3122 insertions(+), 76 deletions(-)
 create mode 100644 src/backend/libpq/be-secure-nss.c
 create mode 100644 src/include/common/pg_nss.h
 create mode 100644 src/interfaces/libpq/fe-secure-nss.c

diff --git a/configure b/configure
index 8af4b99021..cc6088b545 100755
--- a/configure
+++ b/configure
@@ -653,6 +653,9 @@ LIBOBJS
 UUID_LIBS
 LDAP_LIBS_BE
 LDAP_LIBS_FE
+with_ssl
+NSPR_CONFIG
+NSS_CONFIG
 PTHREAD_CFLAGS
 PTHREAD_LIBS
 PTHREAD_CC
@@ -710,7 +713,6 @@ with_uuid
 with_readline
 with_systemd
 with_selinux
-with_openssl
 with_ldap
 with_krb_srvnam
 krb_srvtab
@@ -798,6 +800,7 @@ infodir
 docdir
 oldincludedir
 includedir
+runstatedir
 localstatedir
 sharedstatedir
 sysconfdir
@@ -855,7 +858,6 @@ with_pam
 with_bsd_auth
 with_ldap
 with_bonjour
-with_openssl
 with_selinux
 with_systemd
 with_readline
@@ -867,6 +869,8 @@ with_libxslt
 with_system_tzdata
 with_zlib
 with_gnu_ld
+with_ssl
+with_openssl
 enable_largefile
 '
       ac_precious_vars='build_alias
@@ -935,6 +939,7 @@ datadir='${datarootdir}'
 sysconfdir='${prefix}/etc'
 sharedstatedir='${prefix}/com'
 localstatedir='${prefix}/var'
+runstatedir='${localstatedir}/run'
 includedir='${prefix}/include'
 oldincludedir='/usr/include'
 docdir='${datarootdir}/doc/${PACKAGE_TARNAME}'
@@ -1187,6 +1192,15 @@ do
   | -silent | --silent | --silen | --sile | --sil)
     silent=yes ;;
 
+  -runstatedir | --runstatedir | --runstatedi | --runstated \
+  | --runstate | --runstat | --runsta | --runst | --runs \
+  | --run | --ru | --r)
+    ac_prev=runstatedir ;;
+  -runstatedir=* | --runstatedir=* | --runstatedi=* | --runstated=* \
+  | --runstate=* | --runstat=* | --runsta=* | --runst=* | --runs=* \
+  | --run=* | --ru=* | --r=*)
+    runstatedir=$ac_optarg ;;
+
   -sbindir | --sbindir | --sbindi | --sbind | --sbin | --sbi | --sb)
     ac_prev=sbindir ;;
   -sbindir=* | --sbindir=* | --sbindi=* | --sbind=* | --sbin=* \
@@ -1324,7 +1338,7 @@ fi
 for ac_var in	exec_prefix prefix bindir sbindir libexecdir datarootdir \
 		datadir sysconfdir sharedstatedir localstatedir includedir \
 		oldincludedir docdir infodir htmldir dvidir pdfdir psdir \
-		libdir localedir mandir
+		libdir localedir mandir runstatedir
 do
   eval ac_val=\$$ac_var
   # Remove trailing slashes.
@@ -1477,6 +1491,7 @@ Fine tuning of the installation directories:
   --sysconfdir=DIR        read-only single-machine data [PREFIX/etc]
   --sharedstatedir=DIR    modifiable architecture-independent data [PREFIX/com]
   --localstatedir=DIR     modifiable single-machine data [PREFIX/var]
+  --runstatedir=DIR       modifiable per-process data [LOCALSTATEDIR/run]
   --libdir=DIR            object code libraries [EPREFIX/lib]
   --includedir=DIR        C header files [PREFIX/include]
   --oldincludedir=DIR     C header files for non-gcc [/usr/include]
@@ -1557,7 +1572,6 @@ Optional Packages:
   --with-bsd-auth         build with BSD Authentication support
   --with-ldap             build with LDAP support
   --with-bonjour          build with Bonjour support
-  --with-openssl          build with OpenSSL support
   --with-selinux          build with SELinux support
   --with-systemd          build with systemd support
   --without-readline      do not use GNU Readline nor BSD Libedit for editing
@@ -1571,6 +1585,8 @@ Optional Packages:
                           use system time zone data in DIR
   --without-zlib          do not use Zlib
   --with-gnu-ld           assume the C compiler uses GNU ld [default=no]
+  --with-ssl=LIB          use LIB for SSL/TLS support (openssl, nss)
+  --with-openssl          obsolete spelling of --with-ssl=openssl
 
 Some influential environment variables:
   CC          C compiler command
@@ -8071,41 +8087,6 @@ fi
 $as_echo "$with_bonjour" >&6; }
 
 
-#
-# OpenSSL
-#
-{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether to build with OpenSSL support" >&5
-$as_echo_n "checking whether to build with OpenSSL support... " >&6; }
-
-
-
-# Check whether --with-openssl was given.
-if test "${with_openssl+set}" = set; then :
-  withval=$with_openssl;
-  case $withval in
-    yes)
-
-$as_echo "#define USE_OPENSSL 1" >>confdefs.h
-
-      ;;
-    no)
-      :
-      ;;
-    *)
-      as_fn_error $? "no argument expected for --with-openssl option" "$LINENO" 5
-      ;;
-  esac
-
-else
-  with_openssl=no
-
-fi
-
-
-{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $with_openssl" >&5
-$as_echo "$with_openssl" >&6; }
-
-
 #
 # SELinux
 #
@@ -12179,7 +12160,64 @@ fi
   fi
 fi
 
+#
+# SSL Library
+#
+# There are currently two supported SSL/TLS libraries, OpenSSL and NSS.
+#
+
+
+
+# Check whether --with-ssl was given.
+if test "${with_ssl+set}" = set; then :
+  withval=$with_ssl;
+  case $withval in
+    yes)
+      as_fn_error $? "argument required for --with-ssl option" "$LINENO" 5
+      ;;
+    no)
+      as_fn_error $? "argument required for --with-ssl option" "$LINENO" 5
+      ;;
+    *)
+
+      ;;
+  esac
+
+fi
+
+
+if test x"$with_ssl" = x"" ; then
+  with_ssl=no
+fi
+
+
+
+# Check whether --with-openssl was given.
+if test "${with_openssl+set}" = set; then :
+  withval=$with_openssl;
+  case $withval in
+    yes)
+      :
+      ;;
+    no)
+      :
+      ;;
+    *)
+      as_fn_error $? "no argument expected for --with-openssl option" "$LINENO" 5
+      ;;
+  esac
+
+else
+  with_openssl=no
+
+fi
+
+
 if test "$with_openssl" = yes ; then
+  with_ssl=openssl
+fi
+
+if test "$with_ssl" = openssl ; then
     # Minimum required OpenSSL version is 1.0.1
 
 $as_echo "#define OPENSSL_API_COMPAT 0x10001000L" >>confdefs.h
@@ -12440,8 +12478,280 @@ _ACEOF
 fi
 done
 
+
+$as_echo "#define USE_OPENSSL 1" >>confdefs.h
+
+elif test "$with_ssl" = nss ; then
+  # TODO: fallback in case nss-config/nspr-config aren't found.
+  if test -z "$NSS_CONFIG"; then
+  for ac_prog in nss-config
+do
+  # Extract the first word of "$ac_prog", so it can be a program name with args.
+set dummy $ac_prog; ac_word=$2
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
+$as_echo_n "checking for $ac_word... " >&6; }
+if ${ac_cv_path_NSS_CONFIG+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  case $NSS_CONFIG in
+  [\\/]* | ?:[\\/]*)
+  ac_cv_path_NSS_CONFIG="$NSS_CONFIG" # Let the user override the test with a path.
+  ;;
+  *)
+  as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH
+do
+  IFS=$as_save_IFS
+  test -z "$as_dir" && as_dir=.
+    for ac_exec_ext in '' $ac_executable_extensions; do
+  if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
+    ac_cv_path_NSS_CONFIG="$as_dir/$ac_word$ac_exec_ext"
+    $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
+    break 2
+  fi
+done
+  done
+IFS=$as_save_IFS
+
+  ;;
+esac
+fi
+NSS_CONFIG=$ac_cv_path_NSS_CONFIG
+if test -n "$NSS_CONFIG"; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $NSS_CONFIG" >&5
+$as_echo "$NSS_CONFIG" >&6; }
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+fi
+
+
+  test -n "$NSS_CONFIG" && break
+done
+
+else
+  # Report the value of NSS_CONFIG in configure's output in all cases.
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for NSS_CONFIG" >&5
+$as_echo_n "checking for NSS_CONFIG... " >&6; }
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $NSS_CONFIG" >&5
+$as_echo "$NSS_CONFIG" >&6; }
+fi
+
+  if test -z "$NSPR_CONFIG"; then
+  for ac_prog in nspr-config
+do
+  # Extract the first word of "$ac_prog", so it can be a program name with args.
+set dummy $ac_prog; ac_word=$2
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
+$as_echo_n "checking for $ac_word... " >&6; }
+if ${ac_cv_path_NSPR_CONFIG+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  case $NSPR_CONFIG in
+  [\\/]* | ?:[\\/]*)
+  ac_cv_path_NSPR_CONFIG="$NSPR_CONFIG" # Let the user override the test with a path.
+  ;;
+  *)
+  as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH
+do
+  IFS=$as_save_IFS
+  test -z "$as_dir" && as_dir=.
+    for ac_exec_ext in '' $ac_executable_extensions; do
+  if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
+    ac_cv_path_NSPR_CONFIG="$as_dir/$ac_word$ac_exec_ext"
+    $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
+    break 2
+  fi
+done
+  done
+IFS=$as_save_IFS
+
+  ;;
+esac
+fi
+NSPR_CONFIG=$ac_cv_path_NSPR_CONFIG
+if test -n "$NSPR_CONFIG"; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $NSPR_CONFIG" >&5
+$as_echo "$NSPR_CONFIG" >&6; }
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+fi
+
+
+  test -n "$NSPR_CONFIG" && break
+done
+
+else
+  # Report the value of NSPR_CONFIG in configure's output in all cases.
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for NSPR_CONFIG" >&5
+$as_echo_n "checking for NSPR_CONFIG... " >&6; }
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $NSPR_CONFIG" >&5
+$as_echo "$NSPR_CONFIG" >&6; }
+fi
+
+  if test -n "$NSS_CONFIG"; then
+    NSS_LIBS=`$NSS_CONFIG --libs`
+	NSS_CFLAGS=`$NSS_CONFIG --cflags`
+  fi
+  if test -n "$NSPR_CONFIG"; then
+	NSPR_LIBS=`$NSPR_CONFIG --libs`
+	NSPR_CFLAGS=`$NSPR_CONFIG --cflags`
+  fi
+
+  LDFLAGS="$LDFLAGS $NSS_LIBS $NSPR_LIBS"
+  CFLAGS="$CFLAGS $NSS_CFLAGS $NSPR_CFLAGS"
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for NSS_InitContext in -lnss3" >&5
+$as_echo_n "checking for NSS_InitContext in -lnss3... " >&6; }
+if ${ac_cv_lib_nss3_NSS_InitContext+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lnss3  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char NSS_InitContext ();
+int
+main ()
+{
+return NSS_InitContext ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_lib_nss3_NSS_InitContext=yes
+else
+  ac_cv_lib_nss3_NSS_InitContext=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_nss3_NSS_InitContext" >&5
+$as_echo "$ac_cv_lib_nss3_NSS_InitContext" >&6; }
+if test "x$ac_cv_lib_nss3_NSS_InitContext" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_LIBNSS3 1
+_ACEOF
+
+  LIBS="-lnss3 $LIBS"
+
+else
+  as_fn_error $? "library 'nss3' is required for NSS" "$LINENO" 5
 fi
 
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for PR_GetDefaultIOMethods in -lnspr4" >&5
+$as_echo_n "checking for PR_GetDefaultIOMethods in -lnspr4... " >&6; }
+if ${ac_cv_lib_nspr4_PR_GetDefaultIOMethods+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lnspr4  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char PR_GetDefaultIOMethods ();
+int
+main ()
+{
+return PR_GetDefaultIOMethods ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_lib_nspr4_PR_GetDefaultIOMethods=yes
+else
+  ac_cv_lib_nspr4_PR_GetDefaultIOMethods=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_nspr4_PR_GetDefaultIOMethods" >&5
+$as_echo "$ac_cv_lib_nspr4_PR_GetDefaultIOMethods" >&6; }
+if test "x$ac_cv_lib_nspr4_PR_GetDefaultIOMethods" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_LIBNSPR4 1
+_ACEOF
+
+  LIBS="-lnspr4 $LIBS"
+
+else
+  as_fn_error $? "library 'nspr4' is required for NSS" "$LINENO" 5
+fi
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for SSL_GetImplementedCiphers in -lssl3" >&5
+$as_echo_n "checking for SSL_GetImplementedCiphers in -lssl3... " >&6; }
+if ${ac_cv_lib_ssl3_SSL_GetImplementedCiphers+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lssl3  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char SSL_GetImplementedCiphers ();
+int
+main ()
+{
+return SSL_GetImplementedCiphers ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_lib_ssl3_SSL_GetImplementedCiphers=yes
+else
+  ac_cv_lib_ssl3_SSL_GetImplementedCiphers=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_ssl3_SSL_GetImplementedCiphers" >&5
+$as_echo "$ac_cv_lib_ssl3_SSL_GetImplementedCiphers" >&6; }
+if test "x$ac_cv_lib_ssl3_SSL_GetImplementedCiphers" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_LIBSSL3 1
+_ACEOF
+
+  LIBS="-lssl3 $LIBS"
+
+else
+  as_fn_error $? "library 'ssl3' is required for NSS" "$LINENO" 5
+fi
+
+
+$as_echo "#define USE_NSS 1" >>confdefs.h
+
+elif test "$with_ssl" != no ; then
+  as_fn_error $? "--with-ssl must specify one of openssl or nss" "$LINENO" 5
+fi
+
+
 if test "$with_pam" = yes ; then
   { $as_echo "$as_me:${as_lineno-$LINENO}: checking for pam_start in -lpam" >&5
 $as_echo_n "checking for pam_start in -lpam... " >&6; }
@@ -13327,7 +13637,7 @@ done
 
 fi
 
-if test "$with_openssl" = yes ; then
+if test "$with_ssl" = openssl ; then
   ac_fn_c_check_header_mongrel "$LINENO" "openssl/ssl.h" "ac_cv_header_openssl_ssl_h" "$ac_includes_default"
 if test "x$ac_cv_header_openssl_ssl_h" = xyes; then :
 
@@ -13344,6 +13654,25 @@ else
 fi
 
 
+fi
+
+if test "$with_ssl" = nss ; then
+  ac_fn_c_check_header_mongrel "$LINENO" "nss/ssl.h" "ac_cv_header_nss_ssl_h" "$ac_includes_default"
+if test "x$ac_cv_header_nss_ssl_h" = xyes; then :
+
+else
+  as_fn_error $? "header file <nss/ssl.h> is required for NSS" "$LINENO" 5
+fi
+
+
+  ac_fn_c_check_header_mongrel "$LINENO" "nss/nss.h" "ac_cv_header_nss_nss_h" "$ac_includes_default"
+if test "x$ac_cv_header_nss_nss_h" = xyes; then :
+
+else
+  as_fn_error $? "header file <nss/nss.h> is required for NSS" "$LINENO" 5
+fi
+
+
 fi
 
 if test "$with_pam" = yes ; then
@@ -14689,7 +15018,7 @@ else
     We can't simply define LARGE_OFF_T to be 9223372036854775807,
     since some C++ compilers masquerading as C compilers
     incorrectly reject 9223372036854775807.  */
-#define LARGE_OFF_T (((off_t) 1 << 62) - 1 + ((off_t) 1 << 62))
+#define LARGE_OFF_T ((((off_t) 1 << 31) << 31) - 1 + (((off_t) 1 << 31) << 31))
   int off_t_is_large[(LARGE_OFF_T % 2147483629 == 721
 		       && LARGE_OFF_T % 2147483647 == 1)
 		      ? 1 : -1];
@@ -14735,7 +15064,7 @@ else
     We can't simply define LARGE_OFF_T to be 9223372036854775807,
     since some C++ compilers masquerading as C compilers
     incorrectly reject 9223372036854775807.  */
-#define LARGE_OFF_T (((off_t) 1 << 62) - 1 + ((off_t) 1 << 62))
+#define LARGE_OFF_T ((((off_t) 1 << 31) << 31) - 1 + (((off_t) 1 << 31) << 31))
   int off_t_is_large[(LARGE_OFF_T % 2147483629 == 721
 		       && LARGE_OFF_T % 2147483647 == 1)
 		      ? 1 : -1];
@@ -14759,7 +15088,7 @@ rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
     We can't simply define LARGE_OFF_T to be 9223372036854775807,
     since some C++ compilers masquerading as C compilers
     incorrectly reject 9223372036854775807.  */
-#define LARGE_OFF_T (((off_t) 1 << 62) - 1 + ((off_t) 1 << 62))
+#define LARGE_OFF_T ((((off_t) 1 << 31) << 31) - 1 + (((off_t) 1 << 31) << 31))
   int off_t_is_large[(LARGE_OFF_T % 2147483629 == 721
 		       && LARGE_OFF_T % 2147483647 == 1)
 		      ? 1 : -1];
@@ -14804,7 +15133,7 @@ else
     We can't simply define LARGE_OFF_T to be 9223372036854775807,
     since some C++ compilers masquerading as C compilers
     incorrectly reject 9223372036854775807.  */
-#define LARGE_OFF_T (((off_t) 1 << 62) - 1 + ((off_t) 1 << 62))
+#define LARGE_OFF_T ((((off_t) 1 << 31) << 31) - 1 + (((off_t) 1 << 31) << 31))
   int off_t_is_large[(LARGE_OFF_T % 2147483629 == 721
 		       && LARGE_OFF_T % 2147483647 == 1)
 		      ? 1 : -1];
@@ -14828,7 +15157,7 @@ rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
     We can't simply define LARGE_OFF_T to be 9223372036854775807,
     since some C++ compilers masquerading as C compilers
     incorrectly reject 9223372036854775807.  */
-#define LARGE_OFF_T (((off_t) 1 << 62) - 1 + ((off_t) 1 << 62))
+#define LARGE_OFF_T ((((off_t) 1 << 31) << 31) - 1 + (((off_t) 1 << 31) << 31))
   int off_t_is_large[(LARGE_OFF_T % 2147483629 == 721
 		       && LARGE_OFF_T % 2147483647 == 1)
 		      ? 1 : -1];
@@ -18106,6 +18435,9 @@ $as_echo_n "checking which random number source to use... " >&6; }
 if test x"$with_openssl" = x"yes" ; then
   { $as_echo "$as_me:${as_lineno-$LINENO}: result: OpenSSL" >&5
 $as_echo "OpenSSL" >&6; }
+elif test x"$with_nss" = x"yes" ; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: NSS" >&5
+$as_echo "NSS" >&6; }
 elif test x"$PORTNAME" = x"win32" ; then
   { $as_echo "$as_me:${as_lineno-$LINENO}: result: Windows native" >&5
 $as_echo "Windows native" >&6; }
diff --git a/configure.ac b/configure.ac
index 868a94c9ba..0da8cc9b0b 100644
--- a/configure.ac
+++ b/configure.ac
@@ -852,15 +852,6 @@ PGAC_ARG_BOOL(with, bonjour, no,
 AC_MSG_RESULT([$with_bonjour])
 
 
-#
-# OpenSSL
-#
-AC_MSG_CHECKING([whether to build with OpenSSL support])
-PGAC_ARG_BOOL(with, openssl, no, [build with OpenSSL support],
-              [AC_DEFINE([USE_OPENSSL], 1, [Define to build with OpenSSL support. (--with-openssl)])])
-AC_MSG_RESULT([$with_openssl])
-AC_SUBST(with_openssl)
-
 #
 # SELinux
 #
@@ -1209,7 +1200,21 @@ if test "$with_gssapi" = yes ; then
   fi
 fi
 
+#
+# SSL Library
+#
+# There are currently two supported SSL/TLS libraries, OpenSSL and NSS.
+#
+PGAC_ARG_REQ(with, ssl, [LIB], [use LIB for SSL/TLS support (openssl, nss)])
+if test x"$with_ssl" = x"" ; then
+  with_ssl=no
+fi
+PGAC_ARG_BOOL(with, openssl, no, [obsolete spelling of --with-ssl=openssl])
 if test "$with_openssl" = yes ; then
+  with_ssl=openssl
+fi
+
+if test "$with_ssl" = openssl ; then
   dnl Order matters!
   # Minimum required OpenSSL version is 1.0.1
   AC_DEFINE(OPENSSL_API_COMPAT, [0x10001000L],
@@ -1233,7 +1238,31 @@ if test "$with_openssl" = yes ; then
   # thread-safety. In 1.1.0, it's no longer required, and CRYPTO_lock()
   # function was removed.
   AC_CHECK_FUNCS([CRYPTO_lock])
+  AC_DEFINE([USE_OPENSSL], 1, [Define to 1 if you have OpenSSL support.])
+elif test "$with_ssl" = nss ; then
+  # TODO: fallback in case nss-config/nspr-config aren't found.
+  PGAC_PATH_PROGS(NSS_CONFIG, nss-config)
+  PGAC_PATH_PROGS(NSPR_CONFIG, nspr-config)
+  if test -n "$NSS_CONFIG"; then
+    NSS_LIBS=`$NSS_CONFIG --libs`
+	NSS_CFLAGS=`$NSS_CONFIG --cflags`
+  fi
+  if test -n "$NSPR_CONFIG"; then
+	NSPR_LIBS=`$NSPR_CONFIG --libs`
+	NSPR_CFLAGS=`$NSPR_CONFIG --cflags`
+  fi
+
+  LDFLAGS="$LDFLAGS $NSS_LIBS $NSPR_LIBS"
+  CFLAGS="$CFLAGS $NSS_CFLAGS $NSPR_CFLAGS"
+
+  AC_CHECK_LIB(nss3, NSS_InitContext, [], [AC_MSG_ERROR([library 'nss3' is required for NSS])])
+  AC_CHECK_LIB(nspr4, PR_GetDefaultIOMethods, [], [AC_MSG_ERROR([library 'nspr4' is required for NSS])])
+  AC_CHECK_LIB(ssl3, SSL_GetImplementedCiphers, [], [AC_MSG_ERROR([library 'ssl3' is required for NSS])])
+  AC_DEFINE([USE_NSS], 1, [Define to 1 if you have NSS support,])
+elif test "$with_ssl" != no ; then
+  AC_MSG_ERROR([--with-ssl must specify one of openssl or nss])
 fi
+AC_SUBST(with_ssl)
 
 if test "$with_pam" = yes ; then
   AC_CHECK_LIB(pam,    pam_start, [], [AC_MSG_ERROR([library 'pam' is required for PAM])])
@@ -1406,11 +1435,16 @@ if test "$with_gssapi" = yes ; then
 	[AC_CHECK_HEADERS(gssapi.h, [], [AC_MSG_ERROR([gssapi.h header file is required for GSSAPI])])])
 fi
 
-if test "$with_openssl" = yes ; then
+if test "$with_ssl" = openssl ; then
   AC_CHECK_HEADER(openssl/ssl.h, [], [AC_MSG_ERROR([header file <openssl/ssl.h> is required for OpenSSL])])
   AC_CHECK_HEADER(openssl/err.h, [], [AC_MSG_ERROR([header file <openssl/err.h> is required for OpenSSL])])
 fi
 
+if test "$with_ssl" = nss ; then
+  AC_CHECK_HEADER(nss/ssl.h, [], [AC_MSG_ERROR([header file <nss/ssl.h> is required for NSS])])
+  AC_CHECK_HEADER(nss/nss.h, [], [AC_MSG_ERROR([header file <nss/nss.h> is required for NSS])])
+fi
+
 if test "$with_pam" = yes ; then
   AC_CHECK_HEADERS(security/pam_appl.h, [],
                    [AC_CHECK_HEADERS(pam/pam_appl.h, [],
@@ -2165,6 +2199,8 @@ fi
 AC_MSG_CHECKING([which random number source to use])
 if test x"$with_openssl" = x"yes" ; then
   AC_MSG_RESULT([OpenSSL])
+elif test x"$with_nss" = x"yes" ; then
+  AC_MSG_RESULT([NSS])
 elif test x"$PORTNAME" = x"win32" ; then
   AC_MSG_RESULT([Windows native])
 else
diff --git a/contrib/postgres_fdw/expected/postgres_fdw.out b/contrib/postgres_fdw/expected/postgres_fdw.out
index 1cad311436..1b0c5ce1fa 100644
--- a/contrib/postgres_fdw/expected/postgres_fdw.out
+++ b/contrib/postgres_fdw/expected/postgres_fdw.out
@@ -8923,7 +8923,7 @@ DO $d$
     END;
 $d$;
 ERROR:  invalid option "password"
-HINT:  Valid options in this context are: service, passfile, channel_binding, connect_timeout, dbname, host, hostaddr, port, options, application_name, keepalives, keepalives_idle, keepalives_interval, keepalives_count, tcp_user_timeout, sslmode, sslcompression, sslcert, sslkey, sslrootcert, sslcrl, requirepeer, ssl_min_protocol_version, ssl_max_protocol_version, gssencmode, krbsrvname, gsslib, target_session_attrs, use_remote_estimate, fdw_startup_cost, fdw_tuple_cost, extensions, updatable, fetch_size
+HINT:  Valid options in this context are: service, passfile, channel_binding, connect_timeout, dbname, host, hostaddr, port, options, application_name, keepalives, keepalives_idle, keepalives_interval, keepalives_count, tcp_user_timeout, sslmode, sslcompression, sslcert, sslkey, sslrootcert, sslcrl, requirepeer, ssl_min_protocol_version, ssl_max_protocol_version, gssencmode, krbsrvname, gsslib, target_session_attrs, cert_database, use_remote_estimate, fdw_startup_cost, fdw_tuple_cost, extensions, updatable, fetch_size
 CONTEXT:  SQL statement "ALTER SERVER loopback_nopw OPTIONS (ADD password 'dummypw')"
 PL/pgSQL function inline_code_block line 3 at EXECUTE
 -- If we add a password for our user mapping instead, we should get a different
diff --git a/src/Makefile.global.in b/src/Makefile.global.in
index 7ca1e9aac5..bdab2a6825 100644
--- a/src/Makefile.global.in
+++ b/src/Makefile.global.in
@@ -183,7 +183,7 @@ with_icu	= @with_icu@
 with_perl	= @with_perl@
 with_python	= @with_python@
 with_tcl	= @with_tcl@
-with_openssl	= @with_openssl@
+with_ssl	= @with_ssl@
 with_readline	= @with_readline@
 with_selinux	= @with_selinux@
 with_systemd	= @with_systemd@
diff --git a/src/backend/libpq/Makefile b/src/backend/libpq/Makefile
index efc5ef760a..045d2c2f6b 100644
--- a/src/backend/libpq/Makefile
+++ b/src/backend/libpq/Makefile
@@ -28,8 +28,12 @@ OBJS = \
 	pqmq.o \
 	pqsignal.o
 
-ifeq ($(with_openssl),yes)
+ifeq ($(with_ssl),openssl)
 OBJS += be-secure-openssl.o
+else
+ifeq ($(with_ssl),nss)
+OBJS += be-secure-nss.o
+endif
 endif
 
 ifeq ($(with_gssapi),yes)
diff --git a/src/backend/libpq/auth.c b/src/backend/libpq/auth.c
index 545635f41a..09ad2ad063 100644
--- a/src/backend/libpq/auth.c
+++ b/src/backend/libpq/auth.c
@@ -2849,7 +2849,14 @@ CheckCertAuth(Port *port)
 {
 	int			status_check_usermap = STATUS_ERROR;
 
+#if defined(USE_OPENSSL)
 	Assert(port->ssl);
+#elif defined(USE_NSS)
+	/* TODO: should we rename pr_fd to ssl, to keep consistency? */
+	Assert(port->pr_fd);
+#else
+	Assert(false);
+#endif
 
 	/* Make sure we have received a username in the certificate */
 	if (port->peer_cn == NULL ||
diff --git a/src/backend/libpq/be-secure-nss.c b/src/backend/libpq/be-secure-nss.c
new file mode 100644
index 0000000000..111b46dea8
--- /dev/null
+++ b/src/backend/libpq/be-secure-nss.c
@@ -0,0 +1,1265 @@
+/*-------------------------------------------------------------------------
+ *
+ * be-secure-nss.c
+ *	  functions for supporting NSS as a TLS backend
+ *
+ *
+ * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ *	  src/backend/libpq/be-secure-nss.c
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#include "postgres.h"
+
+#include <sys/stat.h>
+
+/*
+ * BITS_PER_BYTE is also defined in the NSPR header files, so we need to undef
+ * our version to avoid compiler warnings on redefinition.
+ */
+#define pg_BITS_PER_BYTE BITS_PER_BYTE
+#undef BITS_PER_BYTE
+
+/*
+ * The nspr/obsolete/protypes.h NSPR header typedefs uint64 and int64 with
+ * colliding definitions from ours, causing a much expected compiler error.
+ * Remove backwards compatibility with ancient NSPR versions to avoid this.
+ */
+#define NO_NSPR_10_SUPPORT
+#include <nspr/nspr.h>
+#include <nspr/prerror.h>
+#include <nspr/prio.h>
+#include <nspr/prmem.h>
+#include <nspr/prtypes.h>
+
+#include <nss/nss.h>
+#include <nss/base64.h>
+#include <nss/cert.h>
+#include <nss/certdb.h>
+#include <nss/hasht.h>
+#include <nss/keyhi.h>
+#include <nss/pk11pub.h>
+#include <nss/secder.h>
+#include <nss/secerr.h>
+#include <nss/secitem.h>
+#include <nss/secoidt.h>
+#include <nss/secport.h>
+#include <nss/ssl.h>
+#include <nss/sslerr.h>
+#include <nss/sslproto.h>
+
+/*
+ * Ensure that the colliding definitions match, else throw an error. In case
+ * NSPR has removed the definition for some reason, make sure to put ours
+ * back again.
+ */
+#if defined(BITS_PER_BYTE)
+#if BITS_PER_BYTE != pg_BITS_PER_BYTE
+#error "incompatible byte widths between NSPR and postgres"
+#endif
+#else
+#define BITS_PER_BYTE pg_BITS_PER_BYTE
+#endif
+#undef pg_BITS_PER_BYTE
+
+#include "common/pg_nss.h"
+#include "lib/stringinfo.h"
+#include "libpq/libpq.h"
+#include "nodes/pg_list.h"
+#include "miscadmin.h"
+#include "storage/fd.h"
+#include "utils/guc.h"
+#include "utils/memutils.h"
+
+
+/* default init hook can be overridden by a shared library */
+static void default_nss_tls_init(bool isServerStart);
+nss_tls_init_hook_type nss_tls_init_hook = default_nss_tls_init;
+
+static PRDescIdentity pr_id;
+
+static PRIOMethods pr_iomethods;
+static NSSInitContext * nss_context = NULL;
+static SSLVersionRange desired_sslver;
+
+static char *external_ssl_passphrase_cb(PK11SlotInfo *slot, PRBool retry, void *arg);
+static bool dummy_ssl_passwd_cb_called = false;
+static bool ssl_is_server_start;
+
+/*
+ * PR_ImportTCPSocket() is a private API, but very widely used, as it's the
+ * only way to make NSS use an already set up POSIX file descriptor rather
+ * than opening one itself. To quote the NSS documentation:
+ *
+ *		"In theory, code that uses PR_ImportTCPSocket may break when NSPR's
+ *		implementation changes. In practice, this is unlikely to happen because
+ *		NSPR's implementation has been stable for years and because of NSPR's
+ *		strong commitment to backward compatibility."
+ *
+ * https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSPR/Reference/PR_ImportTCPSocket
+ *
+ * The function is declared in <private/pprio.h>, but as it is a header marked
+ * private we declare it here rather than including it.
+ */
+NSPR_API(PRFileDesc *) PR_ImportTCPSocket(int);
+
+/* NSS IO layer callback overrides */
+static PRInt32 pg_ssl_read(PRFileDesc * fd, void *buf, PRInt32 amount,
+						   PRIntn flags, PRIntervalTime timeout);
+static PRInt32 pg_ssl_write(PRFileDesc * fd, const void *buf, PRInt32 amount,
+							PRIntn flags, PRIntervalTime timeout);
+static PRStatus pg_ssl_close(PRFileDesc * fd);
+/* Utility functions */
+static PRFileDesc * init_iolayer(Port *port);
+static uint16 ssl_protocol_version_to_nss(int v, const char *guc_name);
+
+static char *pg_SSLerrmessage(PRErrorCode errcode);
+static char *ssl_protocol_version_to_string(int v);
+static SECStatus pg_cert_auth_handler(void *arg, PRFileDesc * fd,
+									  PRBool checksig, PRBool isServer);
+static SECStatus pg_bad_cert_handler(void *arg, PRFileDesc * fd);
+static char *dummy_ssl_passphrase_cb(PK11SlotInfo * slot, PRBool retry, void *arg);
+
+/* ------------------------------------------------------------ */
+/*						 Public interface						*/
+/* ------------------------------------------------------------ */
+
+/*
+ * be_tls_init
+ *			Initialize the nss TLS library in the postmaster
+ *
+ * The majority of the setup needs to happen in be_tls_open_server since the
+ * NSPR initialization must happen after the forking of the backend. We could
+ * potentially move some parts in under !isServerStart, but so far this is the
+ * separation chosen.
+ */
+int
+be_tls_init(bool isServerStart)
+{
+	SECStatus	status;
+	SSLVersionRange supported_sslver;
+
+	status = SSL_ConfigServerSessionIDCacheWithOpt(0, 0, NULL, 1, 0, 0, PR_FALSE);
+	if (status != SECSuccess)
+	{
+		ereport(isServerStart ? FATAL : LOG,
+				(errmsg("unable to connect to TLS connection cache: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+		return -1;
+	}
+
+	if (!ssl_database || strlen(ssl_database) == 0)
+	{
+		ereport(isServerStart ? FATAL : LOG,
+				(errmsg("no certificate database specified")));
+		return -1;
+	}
+
+	/*
+	 * We check for the desired TLS version range here, even though we cannot
+	 * set it until be_open_server such that we can be compatible with how the
+	 * OpenSSL backend reports errors for incompatible range configurations.
+	 * Set either the default supported TLS version range, or the configured
+	 * range from ssl_min_protocol_version and ssl_max_protocol version. In
+	 * case the user hasn't defined the maximum allowed version we fall back
+	 * to the highest version TLS that the library supports.
+	 */
+	if (SSL_VersionRangeGetSupported(ssl_variant_stream, &supported_sslver) != SECSuccess)
+	{
+		ereport(isServerStart ? FATAL : LOG,
+				(errmsg("unable to get default protocol support from NSS")));
+		return -1;
+	}
+
+	/*
+	 * Set the fallback versions for the TLS protocol version range to a
+	 * combination of our minimal requirement and the library maximum. Error
+	 * messages should be kept identical to those in be-secure-openssl.c to
+	 * make translations easier.
+	 */
+	desired_sslver.min = SSL_LIBRARY_VERSION_TLS_1_0;
+	desired_sslver.max = supported_sslver.max;
+
+	if (ssl_min_protocol_version)
+	{
+		int			ver = ssl_protocol_version_to_nss(ssl_min_protocol_version,
+													  "ssl_min_protocol_version");
+
+		if (ver == -1)
+		{
+			ereport(isServerStart ? FATAL : LOG,
+					(errmsg("\"%s\" setting \"%s\" not supported by this build",
+							"ssl_min_protocol_version",
+							GetConfigOption("ssl_min_protocol_version",
+											false, false))));
+			return -1;
+		}
+
+		if (ver > 0)
+			desired_sslver.min = ver;
+	}
+
+	if (ssl_max_protocol_version)
+	{
+		int			ver = ssl_protocol_version_to_nss(ssl_max_protocol_version,
+													  "ssl_max_protocol_version");
+
+		if (ver == -1)
+		{
+			ereport(isServerStart ? FATAL : LOG,
+					(errmsg("\"%s\" setting \"%s\" not supported by this build",
+							"ssl_max_protocol_version",
+							GetConfigOption("ssl_max_protocol_version",
+											false, false))));
+			return -1;
+		}
+		if (ver > 0)
+			desired_sslver.max = ver;
+
+		if (ver < desired_sslver.min)
+		{
+			ereport(isServerStart ? FATAL : LOG,
+					(errmsg("could not set SSL protocol version range"),
+					 errdetail("\"%s\" cannot be higher than \"%s\"",
+							   "ssl_min_protocol_version",
+							   "ssl_max_protocol_version")));
+			return -1;
+		}
+	}
+
+	/*
+	 * Set the passphrase callback which will be used both to obtain the
+	 * passphrase from the user, as well as by NSS to obtain the phrase
+	 * repeatedly.
+	 */
+	ssl_is_server_start = isServerStart;
+	(*nss_tls_init_hook) (isServerStart);
+
+	return 0;
+}
+
+int
+be_tls_open_server(Port *port)
+{
+	SECStatus	status;
+	PRFileDesc *model;
+	PRFileDesc *pr_fd;
+	PRFileDesc *layer;
+	CERTCertificate *server_cert;
+	SECKEYPrivateKey *private_key;
+	CERTSignedCrl *crl;
+	SECItem		crlname;
+	char	   *cert_database;
+	NSSInitParameters params;
+
+	/*
+	 * The NSPR documentation states that runtime initialization via PR_Init
+	 * is no longer required, as the first caller into NSPR will perform the
+	 * initialization implicitly. The documentation doesn't however clarify
+	 * from which version this is holds true, so let's perform the potentially
+	 * superfluous initialization anyways to avoid crashing on older versions
+	 * of NSPR, as there is no difference in overhead.  The NSS documentation
+	 * still states that PR_Init must be called in some way (implicitly or
+	 * explicitly).
+	 *
+	 * The below parameters are what the implicit initialization would've done
+	 * for us, and should work even for older versions where it might not be
+	 * done automatically. The last parameter, maxPTDs, is set to various
+	 * values in other codebases, but has been unused since NSPR 2.1 which was
+	 * released sometime in 1998. In current versions of NSPR all parameters
+	 * are ignored.
+	 */
+	PR_Init(PR_USER_THREAD, PR_PRIORITY_NORMAL, 0 /* maxPTDs */ );
+
+	/*
+	 * The certificate path (configdir) must contain a valid NSS database. If
+	 * the certificate path isn't a valid directory, NSS will fall back on the
+	 * system certificate database. If the certificate path is a directory but
+	 * is empty then the initialization will fail. On the client side this can
+	 * be allowed for any sslmode but the verify-xxx ones.
+	 * https://bugzilla.redhat.com/show_bug.cgi?id=728562 For the server side
+	 * we won't allow this to fail however, as we require the certificate and
+	 * key to exist.
+	 *
+	 * The original design of NSS was for a single application to use a single
+	 * copy of it, initialized with NSS_Initialize() which isn't returning any
+	 * handle with which to refer to NSS. NSS initialization and shutdown are
+	 * global for the application, so a shutdown in another NSS enabled
+	 * library would cause NSS to be stopped for libpq as well.  The fix has
+	 * been to introduce NSS_InitContext which returns a context handle to
+	 * pass to NSS_ShutdownContext.  NSS_InitContext was introduced in NSS
+	 * 3.12, but the use of it is not very well documented.
+	 * https://bugzilla.redhat.com/show_bug.cgi?id=738456
+	 *
+	 * The InitParameters struct passed can be used to override internal
+	 * values in NSS, but the usage is not documented at all. When using
+	 * NSS_Init initializations, the values are instead set via PK11_Configure
+	 * calls so the PK11_Configure documentation can be used to glean some
+	 * details on these.
+	 *
+	 * https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS/PKCS11/Module_Specs
+	 */
+	memset(&params, '\0', sizeof(params));
+	params.length = sizeof(params);
+
+	if (!ssl_database || strlen(ssl_database) == 0)
+		ereport(FATAL,
+				(errmsg("no certificate database specified")));
+
+	cert_database = psprintf("sql:%s", ssl_database);
+	nss_context = NSS_InitContext(cert_database, "", "", "",
+								  &params,
+								  NSS_INIT_READONLY | NSS_INIT_PK11RELOAD);
+	pfree(cert_database);
+
+	if (!nss_context)
+		ereport(FATAL,
+				(errmsg("unable to read certificate database \"%s\": %s",
+						ssl_database, pg_SSLerrmessage(PR_GetError()))));
+
+	/*
+	 * Import the already opened socket as we don't want to use NSPR functions
+	 * for opening the network socket due to how the PostgreSQL protocol works
+	 * with TLS connections. This function is not part of the NSPR public API,
+	 * see the comment at the top of the file for the rationale of still using
+	 * it.
+	 */
+	pr_fd = PR_ImportTCPSocket(port->sock);
+	if (!pr_fd)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to connect to socket")));
+		return -1;
+	}
+
+	/*
+	 * Most of the documentation available, and implementations of, NSS/NSPR
+	 * use the PR_NewTCPSocket() function here, which has the drawback that it
+	 * can only create IPv4 sockets. Instead use PR_OpenTCPSocket() which
+	 * copes with IPv6 as well.
+	 *
+	 * We use a model filedescriptor here which is a construct in NSPR/NSS in
+	 * order to create a configuration template for sockets which can then be
+	 * applied to new sockets created. This makes more sense in a server which
+	 * accepts multiple connections and want to perform the boilerplate just
+	 * once, but it does provide a nice abstraction here as well in that we
+	 * can error out early without having performed any operation on the real
+	 * socket.
+	 */
+	model = PR_OpenTCPSocket(port->laddr.addr.ss_family);
+	if (!model)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to open socket")));
+		return -1;
+	}
+
+	/*
+	 * Convert the NSPR socket to an SSL socket. Ensuring the success of this
+	 * operation is critical as NSS SSL_* functions may return SECSuccess on
+	 * the socket even though SSL hasn't been enabled, which introduce a risk
+	 * of silent downgrades.
+	 */
+	model = SSL_ImportFD(NULL, model);
+	if (!model)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to enable TLS on socket")));
+		return -1;
+	}
+
+	/*
+	 * Configure basic settings for the connection over the SSL socket in
+	 * order to set it up as a server.
+	 */
+	if (SSL_OptionSet(model, SSL_SECURITY, PR_TRUE) != SECSuccess)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to configure TLS connection")));
+		return -1;
+	}
+
+	if (SSL_OptionSet(model, SSL_HANDSHAKE_AS_SERVER, PR_TRUE) != SECSuccess ||
+		SSL_OptionSet(model, SSL_HANDSHAKE_AS_CLIENT, PR_FALSE) != SECSuccess)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to configure TLS connection as server")));
+		return -1;
+	}
+
+	/*
+	 * SSLv2 is disabled by default, and SSLv3 will be excluded from the range
+	 * of allowed protocols further down. Since we really don't want these to
+	 * ever be enabled, let's use belts and suspenders and explicitly turn
+	 * them off as well.
+	 */
+	SSL_OptionSet(model, SSL_ENABLE_SSL2, PR_FALSE);
+	SSL_OptionSet(model, SSL_ENABLE_SSL3, PR_FALSE);
+
+#ifdef SSL_CBC_RANDOM_IV
+
+	/*
+	 * Enable protection against the BEAST attack in case the NSS server has
+	 * support for that. While SSLv3 is disabled, we may still allow TLSv1
+	 * which is affected. The option isn't documented as an SSL option, but as
+	 * an NSS environment variable.
+	 */
+	SSL_OptionSet(model, SSL_CBC_RANDOM_IV, PR_TRUE);
+#endif
+
+	/*
+	 * Configure the allowed ciphers. If there are no user preferred suites,
+	 * set the domestic policy.
+	 *
+	 * Historically there were different cipher policies based on export (and
+	 * import) restrictions: Domestic, Export and France. These are since long
+	 * removed with all ciphers being enabled by default. Due to backwards
+	 * compatibility, the old API is still used even though all three policies
+	 * now do the same thing.
+	 *
+	 * If SSLCipherSuites define a policy of the user, we set that rather than
+	 * enabling all ciphers via NSS_SetDomesticPolicy.
+	 *
+	 * TODO: while this code works, the set of ciphers which can be set and
+	 * still end up with a working socket is woefully underdocumented for
+	 * anything more recent than SSLv3 (the code for TLS actually calls ssl3
+	 * functions under the hood for SSL_CipherPrefSet), so it's unclear if
+	 * this is helpful or not. Using the policies works, but may be too
+	 * coarsely grained.
+	 *
+	 * Another TODO: The SSL_ImplementedCiphers table returned with calling
+	 * SSL_GetImplementedCiphers is sorted in server preference order. Sorting
+	 * SSLCipherSuites according to the order of the ciphers therein could be
+	 * a way to implement ssl_prefer_server_ciphers - if we at all want to use
+	 * cipher selection for NSS like how we do it for OpenSSL that is.
+	 */
+
+	/*
+	 * If no ciphers are specified, enable them all.
+	 */
+	if (!SSLCipherSuites || strlen(SSLCipherSuites) == 0)
+	{
+		status = NSS_SetDomesticPolicy();
+		if (status != SECSuccess)
+		{
+			ereport(COMMERROR,
+					(errmsg("unable to set cipher policy: %s",
+							pg_SSLerrmessage(PR_GetError()))));
+			return -1;
+		}
+	}
+	else
+	{
+		char	   *ciphers,
+				   *c;
+
+		char	   *sep = ":;, ";
+		PRUint16	ciphercode;
+		const		PRUint16 *nss_ciphers;
+
+		/*
+		 * If the user has specified a set of preferred cipher suites we start
+		 * by turning off all the existing suites to avoid the risk of down-
+		 * grades to a weaker cipher than expected.
+		 */
+		nss_ciphers = SSL_GetImplementedCiphers();
+		for (int i = 0; i < SSL_GetNumImplementedCiphers(); i++)
+			SSL_CipherPrefSet(model, nss_ciphers[i], PR_FALSE);
+
+		ciphers = pstrdup(SSLCipherSuites);
+
+		for (c = strtok(ciphers, sep); c; c = strtok(NULL, sep))
+		{
+			ciphercode = pg_find_cipher(c);
+			if (ciphercode != INVALID_CIPHER)
+			{
+				status = SSL_CipherPrefSet(model, ciphercode, PR_TRUE);
+				if (status != SECSuccess)
+				{
+					ereport(COMMERROR,
+							(errmsg("invalid cipher-suite specified: %s", c)));
+					return -1;
+				}
+			}
+		}
+
+		pfree(ciphers);
+	}
+
+	if (SSL_VersionRangeSet(model, &desired_sslver) != SECSuccess)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to set requested SSL protocol version range")));
+		return -1;
+	}
+
+	/*
+	 * Set up the custom IO layer.
+	 */
+	layer = init_iolayer(port);
+	if (!layer)
+		return -1;
+
+	if (PR_PushIOLayer(pr_fd, PR_TOP_IO_LAYER, layer) != PR_SUCCESS)
+	{
+		PR_Close(layer);
+		ereport(COMMERROR,
+				(errmsg("unable to push IO layer")));
+		return -1;
+	}
+
+	server_cert = PK11_FindCertFromNickname(ssl_cert_file, (void *) port);
+	if (!server_cert)
+	{
+		if (dummy_ssl_passwd_cb_called)
+		{
+			ereport(COMMERROR,
+					(errmsg("unable to load certificate for \"%s\": %s",
+							ssl_cert_file, pg_SSLerrmessage(PR_GetError())),
+					 errhint("The certificate requires a password.")));
+			return -1;
+		}
+		else
+		{
+			ereport(COMMERROR,
+					(errmsg("unable to find certificate for \"%s\": %s",
+							ssl_cert_file, pg_SSLerrmessage(PR_GetError()))));
+			return -1;
+		}
+	}
+
+	private_key = PK11_FindKeyByAnyCert(server_cert, (void *) port);
+	if (!private_key)
+	{
+		if (dummy_ssl_passwd_cb_called)
+		{
+			ereport(COMMERROR,
+					(errmsg("unable to load private key for \"%s\": %s",
+							ssl_cert_file, pg_SSLerrmessage(PR_GetError())),
+					 errhint("The private key requires a password.")));
+			return -1;
+		}
+		else
+		{
+			ereport(COMMERROR,
+					(errmsg("unable to find private key for \"%s\": %s",
+							ssl_cert_file, pg_SSLerrmessage(PR_GetError()))));
+			return -1;
+		}
+	}
+
+	/*
+	 * NSS doesn't use CRL files on disk, so we use the ssl_crl_file guc to
+	 * contain the CRL nickname for the current server certificate in the NSS
+	 * certificate database. The main difference from the OpenSSL backend is
+	 * that NSS will use the CRL regardless, but being able to make sure the
+	 * CRL is loaded seems like a good feature.
+	 */
+	if (ssl_crl_file[0])
+	{
+		SECITEM_CopyItem(NULL, &crlname, &server_cert->derSubject);
+		crl = SEC_FindCrlByName(CERT_GetDefaultCertDB(), &crlname, SEC_CRL_TYPE);
+		if (!crl)
+		{
+			ereport(COMMERROR,
+					(errmsg("specified CRL not found in database")));
+			return -1;
+		}
+		SEC_DestroyCrl(crl);
+	}
+
+	/*
+	 * Finally we must configure the socket for being a server by setting the
+	 * certificate and key. The NULL parameter is an SSLExtraServerCertData
+	 * pointer with the final parameter being the size of the extra server
+	 * cert data structure pointed to. This is typically only used for
+	 * credential delegation.
+	 */
+	status = SSL_ConfigServerCert(model, server_cert, private_key, NULL, 0);
+	if (status != SECSuccess)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to configure server for TLS server connections: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+		return -1;
+	}
+
+	ssl_loaded_verify_locations = true;
+
+	/*
+	 * At this point, we no longer have use for the certificate and private
+	 * key as they have been copied into the context by NSS. Destroy our
+	 * copies explicitly to clean out the memory as best we can.
+	 */
+	CERT_DestroyCertificate(server_cert);
+	SECKEY_DestroyPrivateKey(private_key);
+
+	status = SSL_AuthCertificateHook(model, pg_cert_auth_handler, (void *) port);
+	if (status != SECSuccess)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to install authcert hook: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+		return -1;
+	}
+	SSL_BadCertHook(model, pg_bad_cert_handler, (void *) port);
+	SSL_OptionSet(model, SSL_REQUEST_CERTIFICATE, PR_TRUE);
+	SSL_OptionSet(model, SSL_REQUIRE_CERTIFICATE, PR_FALSE);
+
+	port->pr_fd = SSL_ImportFD(model, pr_fd);
+	if (!port->pr_fd)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to initialize")));
+		return -1;
+	}
+
+	PR_Close(model);
+
+	/*
+	 * Force a handshake on the next I/O request, the second parameter means
+	 * that we are a server, PR_FALSE would indicate being a client. NSPR
+	 * requires us to call SSL_ResetHandshake since we imported an already
+	 * established socket.
+	 */
+	status = SSL_ResetHandshake(port->pr_fd, PR_TRUE);
+	if (status != SECSuccess)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to initiate handshake: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+		return -1;
+	}
+	status = SSL_ForceHandshake(port->pr_fd);
+	if (status != SECSuccess)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to handshake: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+		return -1;
+	}
+
+	port->ssl_in_use = true;
+	return 0;
+}
+
+ssize_t
+be_tls_read(Port *port, void *ptr, size_t len, int *waitfor)
+{
+	ssize_t		n_read;
+	PRErrorCode err;
+
+	n_read = PR_Read(port->pr_fd, ptr, len);
+
+	if (n_read < 0)
+	{
+		err = PR_GetError();
+
+		if (err == PR_WOULD_BLOCK_ERROR)
+		{
+			*waitfor = WL_SOCKET_READABLE;
+			errno = EWOULDBLOCK;
+		}
+		else
+			errno = ECONNRESET;
+	}
+
+	return n_read;
+}
+
+ssize_t
+be_tls_write(Port *port, void *ptr, size_t len, int *waitfor)
+{
+	ssize_t		n_write;
+	PRErrorCode err;
+	PRIntn		flags = 0;
+
+	/*
+	 * The flags parameter to PR_Send is no longer used and is, according to
+	 * the documentation, required to be zero.
+	 */
+	n_write = PR_Send(port->pr_fd, ptr, len, flags, PR_INTERVAL_NO_WAIT);
+
+	if (n_write < 0)
+	{
+		err = PR_GetError();
+
+		if (err == PR_WOULD_BLOCK_ERROR)
+		{
+			*waitfor = WL_SOCKET_WRITEABLE;
+			errno = EWOULDBLOCK;
+		}
+		else
+			errno = ECONNRESET;
+	}
+
+	return n_write;
+}
+
+void
+be_tls_close(Port *port)
+{
+	if (!port)
+		return;
+
+	if (port->peer_cn)
+	{
+		SSL_InvalidateSession(port->pr_fd);
+		pfree(port->peer_cn);
+		port->peer_cn = NULL;
+	}
+
+	PR_Close(port->pr_fd);
+	port->pr_fd = NULL;
+	port->ssl_in_use = false;
+
+	if (nss_context)
+	{
+		NSS_ShutdownContext(nss_context);
+		nss_context = NULL;
+	}
+}
+
+void
+be_tls_destroy(void)
+{
+	/*
+	 * It reads a bit odd to clear a session cache when we are destroying the
+	 * context altogether, but if the session cache isn't cleared before
+	 * shutting down the context it will fail with SEC_ERROR_BUSY.
+	 */
+	SSL_ClearSessionCache();
+}
+
+int
+be_tls_get_cipher_bits(Port *port)
+{
+	SECStatus	status;
+	SSLChannelInfo channel;
+	SSLCipherSuiteInfo suite;
+
+	status = SSL_GetChannelInfo(port->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+		goto error;
+
+	status = SSL_GetCipherSuiteInfo(channel.cipherSuite, &suite, sizeof(suite));
+	if (status != SECSuccess)
+		goto error;
+
+	return suite.effectiveKeyBits;
+
+error:
+	ereport(WARNING,
+			(errmsg("unable to extract TLS session information: %s",
+					pg_SSLerrmessage(PR_GetError()))));
+	return 0;
+}
+
+/*
+ * be_tls_get_compression
+ *
+ * NSS disabled support for TLS compression in version 3.33 and removed the
+ * code in a subsequent release. The API for retrieving information about
+ * compression as well as enabling it is kept for backwards compatibility, but
+ * we don't need to consult it since it was only available for SSLv3 which we
+ * don't support.
+ *
+ * https://bugzilla.mozilla.org/show_bug.cgi?id=1409587
+ */
+bool
+be_tls_get_compression(Port *port)
+{
+	return false;
+}
+
+/*
+ * be_tls_get_version
+ *
+ * Returns the protocol version used for the current connection, or NULL in
+ * case of errors.
+ */
+const char *
+be_tls_get_version(Port *port)
+{
+	SECStatus	status;
+	SSLChannelInfo channel;
+
+	status = SSL_GetChannelInfo(port->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+	{
+		ereport(WARNING,
+				(errmsg("unable to extract TLS session information: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+		return NULL;
+	}
+
+	return ssl_protocol_version_to_string(channel.protocolVersion);
+}
+
+const char *
+be_tls_get_cipher(Port *port)
+{
+	SECStatus	status;
+	SSLChannelInfo channel;
+	SSLCipherSuiteInfo suite;
+
+	status = SSL_GetChannelInfo(port->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+		goto error;
+
+	status = SSL_GetCipherSuiteInfo(channel.cipherSuite, &suite, sizeof(suite));
+	if (status != SECSuccess)
+		goto error;
+
+	return suite.cipherSuiteName;
+
+error:
+	ereport(WARNING,
+			(errmsg("unable to extract TLS session information: %s",
+					pg_SSLerrmessage(PR_GetError()))));
+	return NULL;
+}
+
+void
+be_tls_get_peer_subject_name(Port *port, char *ptr, size_t len)
+{
+	CERTCertificate *certificate;
+
+	certificate = SSL_PeerCertificate(port->pr_fd);
+	if (certificate)
+		strlcpy(ptr, CERT_NameToAscii(&certificate->subject), len);
+	else
+		ptr[0] = '\0';
+}
+
+void
+be_tls_get_peer_issuer_name(Port *port, char *ptr, size_t len)
+{
+	CERTCertificate *certificate;
+
+	certificate = SSL_PeerCertificate(port->pr_fd);
+	if (certificate)
+		strlcpy(ptr, CERT_NameToAscii(&certificate->issuer), len);
+	else
+		ptr[0] = '\0';
+}
+
+void
+be_tls_get_peer_serial(Port *port, char *ptr, size_t len)
+{
+	CERTCertificate *certificate;
+
+	certificate = SSL_PeerCertificate(port->pr_fd);
+	if (certificate)
+		snprintf(ptr, len, "%li", DER_GetInteger(&(certificate->serialNumber)));
+	else
+		ptr[0] = '\0';
+}
+
+char *
+be_tls_get_certificate_hash(Port *port, size_t *len)
+{
+	CERTCertificate *certificate;
+	SECOidTag	signature_alg;
+	SECOidTag	digest_alg;
+	int			digest_len;
+	const NSSSignatureAlgorithms *candidate;
+	SECStatus	status;
+	PLArenaPool *arena = NULL;
+	SECItem		digest;
+	char	   *ret;
+
+	*len = 0;
+	certificate = SSL_LocalCertificate(port->pr_fd);
+	if (!certificate)
+		return NULL;
+
+	signature_alg = SECOID_GetAlgorithmTag(&certificate->signature);
+
+	candidate = NSS_SCRAMDigestAlgorithm;
+	while (candidate->signature)
+	{
+		if (signature_alg == candidate->signature)
+		{
+			digest_alg = candidate->hash;
+			digest_len = candidate->len;
+			break;
+		}
+
+		candidate++;
+	}
+
+	if (!candidate->signature)
+		elog(ERROR, "could not find digest for OID '%s'",
+			 SECOID_FindOIDTagDescription(signature_alg));
+
+	arena = PORT_NewArena(SEC_ASN1_DEFAULT_ARENA_SIZE);
+	digest.data = PORT_ArenaZAlloc(arena, sizeof(unsigned char) * digest_len);
+	digest.len = digest_len;
+
+	status = PK11_HashBuf(digest_alg, digest.data,
+						  certificate->derCert.data,
+						  certificate->derCert.len);
+
+	if (status != SECSuccess)
+	{
+		PORT_FreeArena(arena, PR_TRUE);
+		return NULL;
+	}
+
+	ret = palloc(digest.len);
+	memcpy(ret, digest.data, digest.len);
+	*len = digest_len;
+	PORT_FreeArena(arena, PR_TRUE);
+
+	return ret;
+}
+
+/* ------------------------------------------------------------ */
+/*						Internal functions						*/
+/* ------------------------------------------------------------ */
+
+/*
+ * default_nss_tls_init
+ *
+ * The default TLS init hook function which users can override for installing
+ * their own passphrase callbacks and similar actions. In case no callback has
+ * been configured, or the callback isn't reload capable during a server
+ * reload, the dummy callback will be installed.
+ *
+ * The private data for the callback is set differently depending on how it's
+ * invoked. For calls which may invoke the callback deeper in the callstack
+ * the private data is set with SSL_SetPKCS11PinArg. When the call is directly
+ * invoking the callback, like PK11_FindCertFromNickname, then the private
+ * data is passed as a parameter. Setting the data with SSL_SetPKCS11PinArg is
+ * thus not required but good practice.
+ *
+ * NSS doesn't provide a default callback like OpenSSL does, but a callback is
+ * required to be set.  The password callback can be installed at any time, but
+ * setting the private data with SSL_SetPKCS11PinArg requires a PR Filedesc.
+ */
+static void
+default_nss_tls_init(bool isServerStart)
+{
+	/*
+	 * No user-defined callback has been configured, install the dummy call-
+	 * back since we must set something.
+	 */
+	if (!ssl_passphrase_command[0])
+		PK11_SetPasswordFunc(dummy_ssl_passphrase_cb);
+	else
+	{
+		/*
+		 * There is a user-defined callback, set it unless we are in a restart
+		 * and cannot handle restarts due to an interactive callback.
+		 */
+		if (isServerStart)
+			PK11_SetPasswordFunc(external_ssl_passphrase_cb);
+		else
+		{
+			if (ssl_passphrase_command_supports_reload)
+				PK11_SetPasswordFunc(external_ssl_passphrase_cb);
+			else
+				PK11_SetPasswordFunc(dummy_ssl_passphrase_cb);
+		}
+	}
+}
+
+/*
+ * external_ssl_passphrase_cb
+ *
+ * Runs the callback configured by ssl_passphrase_command and returns the
+ * captured password back to NSS.
+ */
+static char *
+external_ssl_passphrase_cb(PK11SlotInfo *slot, PRBool retry, void *arg)
+{
+	/*
+	 * NSS use a hardcoded 256 byte buffer for reading the password so set the
+	 * same limit for our callback buffer.
+	 */
+	char		buf[256];
+	int			len;
+	char	   *password = NULL;
+	char	   *prompt;
+
+	/*
+	 * Since there is no password callback in NSS when the server starts up,
+	 * it makes little sense to create an interactive callback. Thus, if this
+	 * is a retry attempt then give up immediately.
+	 */
+	if (retry)
+		return NULL;
+
+	/*
+	 * Construct the same prompt that NSS uses internally even though it is
+	 * unlikely to serve much purpose, but we must set a prompt so we might as
+	 * well do it right.
+	 */
+	prompt = psprintf("Enter Password or Pin for \"%s\":",
+					  PK11_GetTokenName(slot));
+
+	len = run_ssl_passphrase_command(prompt, ssl_is_server_start, buf, sizeof(buf));
+	pfree(prompt);
+
+	if (!len)
+		return NULL;
+
+	/*
+	 * At least one byte with password content was returned, and NSS requires
+	 * that we return it allocated in NSS controlled memory. If we fail to
+	 * allocate then abort without passing back NULL and bubble up the error
+	 * on the PG side.
+	 */
+	password = (char *) PR_Malloc(len + 1);
+	if (!password)
+	{
+		explicit_bzero(buf, sizeof(buf));
+		ereport(ERROR,
+				(errcode(ERRCODE_OUT_OF_MEMORY),
+				 errmsg("out of memory")));
+	}
+	strlcpy(password, buf, sizeof(password));
+	explicit_bzero(buf, sizeof(buf));
+
+	return password;
+}
+
+/*
+ * dummy_ssl_passphrase_cb
+ *
+ * Return unsuccessful if we are asked to provide the passphrase for a cert or
+ * key, without having a passphrase callback installed.
+ */
+static char *
+dummy_ssl_passphrase_cb(PK11SlotInfo *slot, PRBool retry, void *arg)
+{
+	dummy_ssl_passwd_cb_called = true;
+	return NULL;
+}
+
+static SECStatus
+pg_bad_cert_handler(void *arg, PRFileDesc * fd)
+{
+	Port	   *port = (Port *) arg;
+
+	port->peer_cert_valid = false;
+	return SECFailure;
+}
+
+static SECStatus
+pg_cert_auth_handler(void *arg, PRFileDesc * fd, PRBool checksig, PRBool isServer)
+{
+	SECStatus	status;
+	Port	   *port = (Port *) arg;
+	CERTCertificate *cert;
+	char	   *peer_cn;
+	int			len;
+
+	status = SSL_AuthCertificate(CERT_GetDefaultCertDB(), port->pr_fd, checksig, PR_TRUE);
+	if (status == SECSuccess)
+	{
+		cert = SSL_PeerCertificate(port->pr_fd);
+		len = strlen(cert->subjectName);
+		peer_cn = MemoryContextAllocZero(TopMemoryContext, len + 1);
+
+		/*
+		 * Skip over the key= portion of the key=value containing the peer CN.
+		 */
+		if (strncmp(cert->subjectName, "CN=", 3) == 0)
+			strlcpy(peer_cn, cert->subjectName + strlen("CN="), len + 1);
+		else
+			strlcpy(peer_cn, cert->subjectName, len + 1);
+		CERT_DestroyCertificate(cert);
+
+		port->peer_cn = peer_cn;
+		port->peer_cert_valid = true;
+	}
+
+	return status;
+}
+
+static PRInt32
+pg_ssl_read(PRFileDesc *fd, void *buf, PRInt32 amount, PRIntn flags,
+			PRIntervalTime timeout)
+{
+	PRRecvFN	read_fn;
+	PRInt32		n_read;
+
+	read_fn = fd->lower->methods->recv;
+	n_read = read_fn(fd->lower, buf, amount, flags, timeout);
+
+	return n_read;
+}
+
+static PRInt32
+pg_ssl_write(PRFileDesc *fd, const void *buf, PRInt32 amount, PRIntn flags,
+			 PRIntervalTime timeout)
+{
+	PRSendFN	send_fn;
+	PRInt32		n_write;
+
+	send_fn = fd->lower->methods->send;
+	n_write = send_fn(fd->lower, buf, amount, flags, timeout);
+
+	return n_write;
+}
+
+static PRStatus
+pg_ssl_close(PRFileDesc *fd)
+{
+	/*
+	 * Disconnect our private Port from the fd before closing out the stack.
+	 * (Debug builds of NSPR will assert if we do not.)
+	 */
+	fd->secret = NULL;
+	return PR_GetDefaultIOMethods()->close(fd);
+}
+
+static PRFileDesc *
+init_iolayer(Port *port)
+{
+	const		PRIOMethods *default_methods;
+	PRFileDesc *layer;
+
+	/*
+	 * Start by initializing our layer with all the default methods so that we
+	 * can selectively override the ones we want while still ensuring that we
+	 * have a complete layer specification.
+	 */
+	default_methods = PR_GetDefaultIOMethods();
+	memcpy(&pr_iomethods, default_methods, sizeof(PRIOMethods));
+
+	pr_iomethods.recv = pg_ssl_read;
+	pr_iomethods.send = pg_ssl_write;
+	pr_iomethods.close = pg_ssl_close;
+
+	/*
+	 * Each IO layer must be identified by a unique name, where uniqueness is
+	 * per connection. Each connection in a postgres cluster can generate the
+	 * identity from the same string as they will create their IO layers on
+	 * different sockets. Only one layer per socket can have the same name.
+	 */
+	pr_id = PR_GetUniqueIdentity("PostgreSQL Server");
+	if (pr_id == PR_INVALID_IO_LAYER)
+	{
+		ereport(ERROR,
+				(errmsg("out of memory when setting up TLS connection")));
+		return NULL;
+	}
+
+	/*
+	 * Create the actual IO layer as a stub such that it can be pushed onto
+	 * the layer stack. The step via a stub is required as we define custom
+	 * callbacks.
+	 */
+	layer = PR_CreateIOLayerStub(pr_id, &pr_iomethods);
+	if (!layer)
+	{
+		ereport(ERROR,
+				(errmsg("unable to create NSS I/O layer")));
+		return NULL;
+	}
+
+	/* Store the Port as private data available in callbacks */
+	layer->secret = (void *) port;
+
+	return layer;
+}
+
+static char *
+ssl_protocol_version_to_string(int v)
+{
+	switch (v)
+	{
+			/* SSL v2 and v3 are not supported */
+		case SSL_LIBRARY_VERSION_2:
+		case SSL_LIBRARY_VERSION_3_0:
+			Assert(false);
+			break;
+
+		case SSL_LIBRARY_VERSION_TLS_1_0:
+			return pstrdup("TLSv1.0");
+		case SSL_LIBRARY_VERSION_TLS_1_1:
+			return pstrdup("TLSv1.1");
+		case SSL_LIBRARY_VERSION_TLS_1_2:
+			return pstrdup("TLSv1.2");
+		case SSL_LIBRARY_VERSION_TLS_1_3:
+			return pstrdup("TLSv1.3");
+	}
+
+	return pstrdup("unknown");
+}
+
+
+/*
+ * ssl_protocol_version_to_nss
+ *			Translate PostgreSQL TLS version to NSS version
+ *
+ * Returns zero in case the requested TLS version is undefined (PG_ANY) and
+ * should be set by the caller, or -1 on failure.
+ */
+static uint16
+ssl_protocol_version_to_nss(int v, const char *guc_name)
+{
+	switch (v)
+	{
+			/*
+			 * There is no SSL_LIBRARY_ macro defined in NSS with the value
+			 * zero, so we use this to signal the caller that the highest
+			 * useful version should be set on the connection.
+			 */
+		case PG_TLS_ANY:
+			return 0;
+
+			/*
+			 * No guard is required here as there are no versions of NSS
+			 * without support for TLS1.
+			 */
+		case PG_TLS1_VERSION:
+			return SSL_LIBRARY_VERSION_TLS_1_0;
+		case PG_TLS1_1_VERSION:
+#ifdef SSL_LIBRARY_VERSION_TLS_1_1
+			return SSL_LIBRARY_VERSION_TLS_1_1;
+#else
+			break;
+#endif
+		case PG_TLS1_2_VERSION:
+#ifdef SSL_LIBRARY_VERSION_TLS_1_2
+			return SSL_LIBRARY_VERSION_TLS_1_2;
+#else
+			break;
+#endif
+		case PG_TLS1_3_VERSION:
+#ifdef SSL_LIBRARY_VERSION_TLS_1_3
+			return SSL_LIBRARY_VERSION_TLS_1_3;
+#else
+			break;
+#endif
+		default:
+			break;
+	}
+
+	return -1;
+}
+
+/*
+ * pg_SSLerrmessage
+ *		Create and return a human readable error message given
+ *		the specified error code
+ *
+ * PR_ErrorToName only converts the enum identifier of the error to string,
+ * but that can be quite useful for debugging (and in case PR_ErrorToString is
+ * unable to render a message then we at least have something).
+ */
+static char *
+pg_SSLerrmessage(PRErrorCode errcode)
+{
+	return psprintf("%s (%s)",
+					PR_ErrorToString(errcode, PR_LANGUAGE_I_DEFAULT),
+					PR_ErrorToName(errcode));
+}
diff --git a/src/backend/libpq/be-secure.c b/src/backend/libpq/be-secure.c
index 4cf139a223..5e0c27c134 100644
--- a/src/backend/libpq/be-secure.c
+++ b/src/backend/libpq/be-secure.c
@@ -49,6 +49,9 @@ bool		ssl_passphrase_command_supports_reload;
 #ifdef USE_SSL
 bool		ssl_loaded_verify_locations = false;
 #endif
+#ifdef USE_NSS
+char	   *ssl_database;
+#endif
 
 /* GUC variable controlling SSL cipher list */
 char	   *SSLCipherSuites = NULL;
diff --git a/src/backend/libpq/hba.c b/src/backend/libpq/hba.c
index 371dccb852..12b105bbd1 100644
--- a/src/backend/libpq/hba.c
+++ b/src/backend/libpq/hba.c
@@ -1041,7 +1041,7 @@ parse_hba_line(TokenizedLine *tok_line, int elevel)
 			ereport(elevel,
 					(errcode(ERRCODE_CONFIG_FILE_ERROR),
 					 errmsg("hostssl record cannot match because SSL is not supported by this build"),
-					 errhint("Compile with --with-openssl to use SSL connections."),
+					 errhint("Compile with --with-openssl or --with-nss to use SSL connections."),
 					 errcontext("line %d of configuration file \"%s\"",
 								line_num, HbaFileName)));
 			*err_msg = "hostssl record cannot match because SSL is not supported by this build";
diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c
index 17579eeaca..0095a9980e 100644
--- a/src/backend/utils/misc/guc.c
+++ b/src/backend/utils/misc/guc.c
@@ -4308,7 +4308,11 @@ static struct config_string ConfigureNamesString[] =
 		},
 		&ssl_library,
 #ifdef USE_SSL
+#if defined(USE_OPENSSL)
 		"OpenSSL",
+#elif defined(USE_NSS)
+		"NSS",
+#endif
 #else
 		"",
 #endif
@@ -4366,6 +4370,18 @@ static struct config_string ConfigureNamesString[] =
 		check_canonical_path, assign_pgstat_temp_directory, NULL
 	},
 
+#ifdef USE_NSS
+	{
+		{"ssl_database", PGC_SIGHUP, CONN_AUTH_SSL,
+			gettext_noop("Location of the NSS certificate database."),
+			NULL
+		},
+		&ssl_database,
+		"",
+		NULL, NULL, NULL
+	},
+#endif
+
 	{
 		{"synchronous_standby_names", PGC_SIGHUP, REPLICATION_PRIMARY,
 			gettext_noop("Number of synchronous standbys and list of names of potential synchronous ones."),
@@ -4394,8 +4410,10 @@ static struct config_string ConfigureNamesString[] =
 			GUC_SUPERUSER_ONLY
 		},
 		&SSLCipherSuites,
-#ifdef USE_OPENSSL
+#if defined(USE_OPENSSL)
 		"HIGH:MEDIUM:+3DES:!aNULL",
+#elif defined (USE_NSS)
+		"",
 #else
 		"none",
 #endif
diff --git a/src/common/Makefile b/src/common/Makefile
index 93eb27a2aa..7a4b3dad5d 100644
--- a/src/common/Makefile
+++ b/src/common/Makefile
@@ -80,7 +80,7 @@ OBJS_COMMON = \
 	wait_error.o \
 	wchar.o
 
-ifeq ($(with_openssl),yes)
+ifeq ($(with_ssl),openssl)
 OBJS_COMMON += \
 	protocol_openssl.o \
 	cryptohash_openssl.o
diff --git a/src/include/common/pg_nss.h b/src/include/common/pg_nss.h
new file mode 100644
index 0000000000..008fee85f1
--- /dev/null
+++ b/src/include/common/pg_nss.h
@@ -0,0 +1,175 @@
+/*-------------------------------------------------------------------------
+ *
+ * pg_nss.h
+ *	  Support for NSS as a TLS backend
+ *
+ * These definitions are used by both frontend and backend code.
+ *
+ * Copyright (c) 2020, PostgreSQL Global Development Group
+ *
+ * IDENTIFICATION
+ *        src/include/common/pg_nss.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef PG_NSS_H
+#define PG_NSS_H
+
+#ifdef USE_NSS
+#define NO_NSPR_10_SUPPORT
+#include <nss/hasht.h>
+#include <nss/secoidt.h>
+#include <nss/sslproto.h>
+
+PRUint16	pg_find_cipher(char *name);
+
+typedef struct
+{
+	SECOidTag	signature;
+	SECOidTag	hash;
+	int			len;
+}			NSSSignatureAlgorithms;
+
+typedef struct
+{
+	const char *name;
+	PRUint16	number;
+}			NSSCiphers;
+
+#define INVALID_CIPHER	0xFFFF
+
+static const NSSSignatureAlgorithms NSS_SCRAMDigestAlgorithm[] = {
+
+	{SEC_OID_PKCS1_MD5_WITH_RSA_ENCRYPTION, SEC_OID_SHA256, SHA256_LENGTH},
+	{SEC_OID_PKCS1_SHA1_WITH_RSA_ENCRYPTION, SEC_OID_SHA256, SHA256_LENGTH},
+	{SEC_OID_ISO_SHA_WITH_RSA_SIGNATURE, SEC_OID_SHA256, SHA256_LENGTH},
+	{SEC_OID_ISO_SHA1_WITH_RSA_SIGNATURE, SEC_OID_SHA256, SHA256_LENGTH},
+	{SEC_OID_PKCS5_PBE_WITH_MD5_AND_DES_CBC, SEC_OID_SHA256, SHA256_LENGTH},
+
+	{SEC_OID_ANSIX962_ECDSA_SHA224_SIGNATURE, SEC_OID_SHA224, SHA224_LENGTH},
+	{SEC_OID_PKCS1_SHA224_WITH_RSA_ENCRYPTION, SEC_OID_SHA224, SHA224_LENGTH},
+	{SEC_OID_NIST_DSA_SIGNATURE_WITH_SHA224_DIGEST, SEC_OID_SHA224, SHA224_LENGTH},
+
+	{SEC_OID_ANSIX962_ECDSA_SHA256_SIGNATURE, SEC_OID_SHA256, SHA256_LENGTH},
+	{SEC_OID_PKCS1_SHA256_WITH_RSA_ENCRYPTION, SEC_OID_SHA256, SHA256_LENGTH},
+	{SEC_OID_NIST_DSA_SIGNATURE_WITH_SHA256_DIGEST, SEC_OID_SHA256, SHA256_LENGTH},
+
+	{SEC_OID_ANSIX962_ECDSA_SHA384_SIGNATURE, SEC_OID_SHA384, SHA384_LENGTH},
+	{SEC_OID_PKCS1_SHA384_WITH_RSA_ENCRYPTION, SEC_OID_SHA384, SHA384_LENGTH},
+
+	{SEC_OID_ANSIX962_ECDSA_SHA512_SIGNATURE, SEC_OID_SHA512, SHA512_LENGTH},
+	{SEC_OID_PKCS1_SHA512_WITH_RSA_ENCRYPTION, SEC_OID_SHA512, SHA512_LENGTH},
+
+	{0, 0}
+};
+
+/*
+ * This list is a partial copy of the ciphers in NSS files lib/ssl/sslproto.h
+ * in order to provide a human readable version of the ciphers. It would be
+ * nice to not have to have this, but NSS doesn't provide any API addressing
+ * the ciphers by name. TODO: do we want more of the ciphers, or perhaps less?
+ */
+static const NSSCiphers NSS_CipherList[] = {
+
+	{"TLS_NULL_WITH_NULL_NULL", TLS_NULL_WITH_NULL_NULL},
+
+	{"TLS_RSA_WITH_NULL_MD5", TLS_RSA_WITH_NULL_MD5},
+	{"TLS_RSA_WITH_NULL_SHA", TLS_RSA_WITH_NULL_SHA},
+	{"TLS_RSA_WITH_RC4_128_MD5", TLS_RSA_WITH_RC4_128_MD5},
+	{"TLS_RSA_WITH_RC4_128_SHA", TLS_RSA_WITH_RC4_128_SHA},
+	{"TLS_RSA_WITH_IDEA_CBC_SHA", TLS_RSA_WITH_IDEA_CBC_SHA},
+	{"TLS_RSA_WITH_DES_CBC_SHA", TLS_RSA_WITH_DES_CBC_SHA},
+	{"TLS_RSA_WITH_3DES_EDE_CBC_SHA", TLS_RSA_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_DH_DSS_WITH_DES_CBC_SHA", TLS_DH_DSS_WITH_DES_CBC_SHA},
+	{"TLS_DH_DSS_WITH_3DES_EDE_CBC_SHA", TLS_DH_DSS_WITH_3DES_EDE_CBC_SHA},
+	{"TLS_DH_RSA_WITH_DES_CBC_SHA", TLS_DH_RSA_WITH_DES_CBC_SHA},
+	{"TLS_DH_RSA_WITH_3DES_EDE_CBC_SHA", TLS_DH_RSA_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_DHE_DSS_WITH_DES_CBC_SHA", TLS_DHE_DSS_WITH_DES_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_3DES_EDE_CBC_SHA", TLS_DHE_DSS_WITH_3DES_EDE_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_DES_CBC_SHA", TLS_DHE_RSA_WITH_DES_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA", TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_DH_anon_WITH_RC4_128_MD5", TLS_DH_anon_WITH_RC4_128_MD5},
+	{"TLS_DH_anon_WITH_DES_CBC_SHA", TLS_DH_anon_WITH_DES_CBC_SHA},
+	{"TLS_DH_anon_WITH_3DES_EDE_CBC_SHA", TLS_DH_anon_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_RSA_WITH_AES_128_CBC_SHA", TLS_RSA_WITH_AES_128_CBC_SHA},
+	{"TLS_DH_DSS_WITH_AES_128_CBC_SHA", TLS_DH_DSS_WITH_AES_128_CBC_SHA},
+	{"TLS_DH_RSA_WITH_AES_128_CBC_SHA", TLS_DH_RSA_WITH_AES_128_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_AES_128_CBC_SHA", TLS_DHE_DSS_WITH_AES_128_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_AES_128_CBC_SHA", TLS_DHE_RSA_WITH_AES_128_CBC_SHA},
+	{"TLS_DH_anon_WITH_AES_128_CBC_SHA", TLS_DH_anon_WITH_AES_128_CBC_SHA},
+
+	{"TLS_RSA_WITH_AES_256_CBC_SHA", TLS_RSA_WITH_AES_256_CBC_SHA},
+	{"TLS_DH_DSS_WITH_AES_256_CBC_SHA", TLS_DH_DSS_WITH_AES_256_CBC_SHA},
+	{"TLS_DH_RSA_WITH_AES_256_CBC_SHA", TLS_DH_RSA_WITH_AES_256_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_AES_256_CBC_SHA", TLS_DHE_DSS_WITH_AES_256_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_AES_256_CBC_SHA", TLS_DHE_RSA_WITH_AES_256_CBC_SHA},
+	{"TLS_DH_anon_WITH_AES_256_CBC_SHA", TLS_DH_anon_WITH_AES_256_CBC_SHA},
+	{"TLS_RSA_WITH_NULL_SHA256", TLS_RSA_WITH_NULL_SHA256},
+	{"TLS_RSA_WITH_AES_128_CBC_SHA256", TLS_RSA_WITH_AES_128_CBC_SHA256},
+	{"TLS_RSA_WITH_AES_256_CBC_SHA256", TLS_RSA_WITH_AES_256_CBC_SHA256},
+
+	{"TLS_DHE_DSS_WITH_AES_128_CBC_SHA256", TLS_DHE_DSS_WITH_AES_128_CBC_SHA256},
+	{"TLS_RSA_WITH_CAMELLIA_128_CBC_SHA", TLS_RSA_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DH_DSS_WITH_CAMELLIA_128_CBC_SHA", TLS_DH_DSS_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DH_RSA_WITH_CAMELLIA_128_CBC_SHA", TLS_DH_RSA_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_CAMELLIA_128_CBC_SHA", TLS_DHE_DSS_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA", TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DH_anon_WITH_CAMELLIA_128_CBC_SHA", TLS_DH_anon_WITH_CAMELLIA_128_CBC_SHA},
+
+	{"TLS_DHE_DSS_WITH_RC4_128_SHA", TLS_DHE_DSS_WITH_RC4_128_SHA},
+	{"TLS_DHE_RSA_WITH_AES_128_CBC_SHA256", TLS_DHE_RSA_WITH_AES_128_CBC_SHA256},
+	{"TLS_DHE_DSS_WITH_AES_256_CBC_SHA256", TLS_DHE_DSS_WITH_AES_256_CBC_SHA256},
+	{"TLS_DHE_RSA_WITH_AES_256_CBC_SHA256", TLS_DHE_RSA_WITH_AES_256_CBC_SHA256},
+
+	{"TLS_RSA_WITH_CAMELLIA_256_CBC_SHA", TLS_RSA_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DH_DSS_WITH_CAMELLIA_256_CBC_SHA", TLS_DH_DSS_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DH_RSA_WITH_CAMELLIA_256_CBC_SHA", TLS_DH_RSA_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_CAMELLIA_256_CBC_SHA", TLS_DHE_DSS_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA", TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DH_anon_WITH_CAMELLIA_256_CBC_SHA", TLS_DH_anon_WITH_CAMELLIA_256_CBC_SHA},
+
+	{"TLS_RSA_WITH_SEED_CBC_SHA", TLS_RSA_WITH_SEED_CBC_SHA},
+
+	{"TLS_RSA_WITH_AES_128_GCM_SHA256", TLS_RSA_WITH_AES_128_GCM_SHA256},
+	{"TLS_RSA_WITH_AES_256_GCM_SHA384", TLS_RSA_WITH_AES_256_GCM_SHA384},
+	{"TLS_DHE_RSA_WITH_AES_128_GCM_SHA256", TLS_DHE_RSA_WITH_AES_128_GCM_SHA256},
+	{"TLS_DHE_RSA_WITH_AES_256_GCM_SHA384", TLS_DHE_RSA_WITH_AES_256_GCM_SHA384},
+	{"TLS_DHE_DSS_WITH_AES_128_GCM_SHA256", TLS_DHE_DSS_WITH_AES_128_GCM_SHA256},
+	{"TLS_DHE_DSS_WITH_AES_256_GCM_SHA384", TLS_DHE_DSS_WITH_AES_256_GCM_SHA384},
+
+	{"TLS_AES_128_GCM_SHA256", TLS_AES_128_GCM_SHA256},
+	{"TLS_AES_256_GCM_SHA384", TLS_AES_256_GCM_SHA384},
+	{"TLS_CHACHA20_POLY1305_SHA256", TLS_CHACHA20_POLY1305_SHA256},
+	{NULL, 0}
+};
+
+/*
+ * pg_find_cipher
+ *			Translate an NSS ciphername to the cipher code
+ *
+ * Searches the configured ciphers for the corresponding cipher code to the
+ * name. Search is performed case insensitive.
+ */
+PRUint16
+pg_find_cipher(char *name)
+{
+	const		NSSCiphers *cipher_list = NSS_CipherList;
+
+	while (cipher_list->name)
+	{
+		if (pg_strcasecmp(cipher_list->name, name) == 0)
+			return cipher_list->number;
+
+		cipher_list++;
+	}
+
+	return 0xFFFF;
+}
+
+#endif							/* USE_NSS */
+
+#endif							/* PG_NSS_H */
diff --git a/src/include/libpq/libpq-be.h b/src/include/libpq/libpq-be.h
index 66a8673d93..ea373a0ae0 100644
--- a/src/include/libpq/libpq-be.h
+++ b/src/include/libpq/libpq-be.h
@@ -193,13 +193,18 @@ typedef struct Port
 	bool		peer_cert_valid;
 
 	/*
-	 * OpenSSL structures. (Keep these last so that the locations of other
-	 * fields are the same whether or not you build with OpenSSL.)
+	 * SSL backend specific structures. (Keep these last so that the locations
+	 * of other fields are the same whether or not you build with SSL
+	 * enabled.)
 	 */
 #ifdef USE_OPENSSL
 	SSL		   *ssl;
 	X509	   *peer;
 #endif
+
+#ifdef USE_NSS
+	void	   *pr_fd;
+#endif
 } Port;
 
 #ifdef USE_SSL
@@ -283,7 +288,7 @@ extern void be_tls_get_peer_serial(Port *port, char *ptr, size_t len);
  * This is not supported with old versions of OpenSSL that don't have
  * the X509_get_signature_nid() function.
  */
-#if defined(USE_OPENSSL) && defined(HAVE_X509_GET_SIGNATURE_NID)
+#if defined(USE_NSS) || (defined(USE_OPENSSL) && defined(HAVE_X509_GET_SIGNATURE_NID))
 #define HAVE_BE_TLS_GET_CERTIFICATE_HASH
 extern char *be_tls_get_certificate_hash(Port *port, size_t *len);
 #endif
@@ -293,6 +298,10 @@ extern char *be_tls_get_certificate_hash(Port *port, size_t *len);
 typedef void (*openssl_tls_init_hook_typ) (SSL_CTX *context, bool isServerStart);
 extern PGDLLIMPORT openssl_tls_init_hook_typ openssl_tls_init_hook;
 #endif
+#ifdef USE_NSS
+typedef void (*nss_tls_init_hook_type) (bool isServerStart);
+extern PGDLLIMPORT nss_tls_init_hook_type nss_tls_init_hook;
+#endif
 
 #endif							/* USE_SSL */
 
diff --git a/src/include/libpq/libpq.h b/src/include/libpq/libpq.h
index a55898c85a..d2860b852f 100644
--- a/src/include/libpq/libpq.h
+++ b/src/include/libpq/libpq.h
@@ -88,6 +88,9 @@ extern PGDLLIMPORT bool ssl_passphrase_command_supports_reload;
 #ifdef USE_SSL
 extern bool ssl_loaded_verify_locations;
 #endif
+#ifdef USE_NSS
+extern char *ssl_database;
+#endif
 
 extern int	secure_initialize(bool isServerStart);
 extern bool secure_loaded_verify_locations(void);
diff --git a/src/include/pg_config.h.in b/src/include/pg_config.h.in
index f4d9f3b408..67a9f90e5e 100644
--- a/src/include/pg_config.h.in
+++ b/src/include/pg_config.h.in
@@ -905,6 +905,9 @@
 /* Define to 1 to build with PAM support. (--with-pam) */
 #undef USE_PAM
 
+/* Define to build with NSS support (--with-nss) */
+#undef USE_NSS
+
 /* Define to 1 to use software CRC-32C implementation (slicing-by-8). */
 #undef USE_SLICING_BY_8_CRC32C
 
diff --git a/src/include/pg_config_manual.h b/src/include/pg_config_manual.h
index d27c8601fa..7861b94290 100644
--- a/src/include/pg_config_manual.h
+++ b/src/include/pg_config_manual.h
@@ -176,10 +176,9 @@
 
 /*
  * USE_SSL code should be compiled only when compiling with an SSL
- * implementation.  (Currently, only OpenSSL is supported, but we might add
- * more implementations in the future.)
+ * implementation.
  */
-#ifdef USE_OPENSSL
+#if defined(USE_OPENSSL) || defined(USE_NSS)
 #define USE_SSL
 #endif
 
diff --git a/src/interfaces/libpq/Makefile b/src/interfaces/libpq/Makefile
index c4fde3f93d..837e105ffe 100644
--- a/src/interfaces/libpq/Makefile
+++ b/src/interfaces/libpq/Makefile
@@ -45,12 +45,21 @@ OBJS = \
 	pqexpbuffer.o \
 	fe-auth.o
 
-ifeq ($(with_openssl),yes)
+ifneq ($(with_ssl),no)
+OBJS += \
+	fe-secure-common.o
+endif
+
+ifeq ($(with_ssl),openssl)
 OBJS += \
-	fe-secure-common.o \
 	fe-secure-openssl.o
 endif
 
+ifeq ($(with_ssl), nss)
+OBJS += \
+	fe-secure-nss.o
+endif
+
 ifeq ($(with_gssapi),yes)
 OBJS += \
 	fe-gssapi-common.o \
diff --git a/src/interfaces/libpq/fe-connect.c b/src/interfaces/libpq/fe-connect.c
index 2b78ed8ec3..79d3a35009 100644
--- a/src/interfaces/libpq/fe-connect.c
+++ b/src/interfaces/libpq/fe-connect.c
@@ -355,6 +355,10 @@ static const internalPQconninfoOption PQconninfoOptions[] = {
 		"Target-Session-Attrs", "", 11, /* sizeof("read-write") = 11 */
 	offsetof(struct pg_conn, target_session_attrs)},
 
+	{"cert_database", NULL, NULL, NULL,
+		"CertificateDatabase", "", 64,
+	offsetof(struct pg_conn, cert_database)},
+
 	/* Terminating entry --- MUST BE LAST */
 	{NULL, NULL, NULL, NULL,
 	NULL, NULL, 0}
diff --git a/src/interfaces/libpq/fe-secure-nss.c b/src/interfaces/libpq/fe-secure-nss.c
new file mode 100644
index 0000000000..dca0572e67
--- /dev/null
+++ b/src/interfaces/libpq/fe-secure-nss.c
@@ -0,0 +1,1112 @@
+/*-------------------------------------------------------------------------
+ *
+ * fe-secure-nss.c
+ *	  functions for supporting NSS as a TLS backend for frontend libpq
+ *
+ * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ *	  src/interfaces/libpq/fe-secure-nss.c
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#include "postgres_fe.h"
+
+#include "libpq-fe.h"
+#include "fe-auth.h"
+#include "fe-secure-common.h"
+#include "libpq-int.h"
+#include "common/pg_nss.h"
+
+/*
+ * BITS_PER_BYTE is also defined in the NSPR header files, so we need to undef
+ * our version to avoid compiler warnings on redefinition.
+ */
+#define pg_BITS_PER_BYTE BITS_PER_BYTE
+#undef BITS_PER_BYTE
+
+/*
+ * The nspr/obsolete/protypes.h NSPR header typedefs uint64 and int64 with
+ * colliding definitions from ours, causing a much expected compiler error.
+ * Remove backwards compatibility with ancient NSPR versions to avoid this.
+ */
+#define NO_NSPR_10_SUPPORT
+#include <nspr/nspr.h>
+#include <nspr/prerror.h>
+#include <nspr/prinit.h>
+#include <nspr/prio.h>
+#include <nss/hasht.h>
+#include <nss/nss.h>
+#include <nss/ssl.h>
+#include <nss/sslproto.h>
+#include <nss/pk11func.h>
+#include <nss/secerr.h>
+#include <nss/secoidt.h>
+#include <nss/secmod.h>
+
+/*
+ * Ensure that the colliding definitions match, else throw an error. In case
+ * NSPR remove the definition in a future version (however unlikely that may
+ * be, make sure to put ours back again.
+ */
+#if defined(BITS_PER_BYTE)
+#if BITS_PER_BYTE != pg_BITS_PER_BYTE
+#error "incompatible byte widths between NSPR and PostgreSQL"
+#endif
+#else
+#define BITS_PER_BYTE pg_BITS_PER_BYTE
+#endif
+#undef pg_BITS_PER_BYTE
+
+static SECStatus pg_load_nss_module(SECMODModule * *module, const char *library, const char *name);
+static SECStatus pg_bad_cert_handler(void *arg, PRFileDesc * fd);
+static const char *pg_SSLerrmessage(PRErrorCode errcode);
+static SECStatus pg_client_auth_handler(void *arg, PRFileDesc * socket, CERTDistNames * caNames,
+										CERTCertificate * *pRetCert, SECKEYPrivateKey * *pRetKey);
+static SECStatus pg_cert_auth_handler(void *arg, PRFileDesc * fd, PRBool checksig, PRBool isServer);
+static int	ssl_protocol_version_to_nss(const char *protocol);
+static bool cert_database_has_CA(PGconn *conn);
+
+static char *PQssl_passwd_cb(PK11SlotInfo * slot, PRBool retry, void *arg);
+
+/*
+ * PR_ImportTCPSocket() is a private API, but very widely used, as it's the
+ * only way to make NSS use an already set up POSIX file descriptor rather
+ * than opening one itself. To quote the NSS documentation:
+ *
+ *		"In theory, code that uses PR_ImportTCPSocket may break when NSPR's
+ *		implementation changes. In practice, this is unlikely to happen because
+ *		NSPR's implementation has been stable for years and because of NSPR's
+ *		strong commitment to backward compatibility."
+ *
+ * https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSPR/Reference/PR_ImportTCPSocket
+ *
+ * The function is declared in <private/pprio.h>, but as it is a header marked
+ * private we declare it here rather than including it.
+ */
+NSPR_API(PRFileDesc *) PR_ImportTCPSocket(int);
+
+static SECMODModule * ca_trust = NULL;
+static NSSInitContext * nss_context = NULL;
+
+/*
+ * This logic exist in NSS as well, but it's only available for when there is
+ * a database to open, and not only using the system trust store. Thus, we
+ * need to keep our own copy.
+ */
+#if defined(WIN32)
+static const char *ca_trust_name = "nssckbi.dll";
+#elif defined(__darwin__)
+static const char *ca_trust_name = "libnssckbi.dylib";
+#else
+static const char *ca_trust_name = "libnssckbi.so";
+#endif
+
+static PQsslKeyPassHook_nss_type PQsslKeyPassHook = NULL;
+
+/* ------------------------------------------------------------ */
+/*			 Procedures common to all secure sessions			*/
+/* ------------------------------------------------------------ */
+
+/*
+ * pgtls_init_library
+ *
+ * There is no direct equivalent for PQinitOpenSSL in NSS/NSPR, with PR_Init
+ * being the closest match there is. PR_Init is however already documented to
+ * not be required so simply making this a noop seems like the best option.
+ */
+void
+pgtls_init_library(bool do_ssl, int do_crypto)
+{
+	/* noop */
+}
+
+int
+pgtls_init(PGconn *conn)
+{
+	conn->ssl_in_use = false;
+	conn->has_password = false;
+
+	return 0;
+}
+
+void
+pgtls_close(PGconn *conn)
+{
+	if (nss_context)
+	{
+		NSS_ShutdownContext(nss_context);
+		nss_context = NULL;
+	}
+}
+
+PostgresPollingStatusType
+pgtls_open_client(PGconn *conn)
+{
+	SECStatus	status;
+	PRFileDesc *pr_fd;
+	PRFileDesc *model;
+	NSSInitParameters params;
+	SSLVersionRange desired_range;
+
+	/*
+	 * The NSPR documentation states that runtime initialization via PR_Init
+	 * is no longer required, as the first caller into NSPR will perform the
+	 * initialization implicitly. See be-secure-nss.c for further discussion
+	 * on PR_Init.
+	 */
+	PR_Init(PR_USER_THREAD, PR_PRIORITY_NORMAL, 0);
+
+	/*
+	 * NSS initialization and the use of contexts is further discussed in
+	 * be-secure-nss.c
+	 */
+	memset(&params, 0, sizeof(params));
+	params.length = sizeof(params);
+
+	if (conn->cert_database && strlen(conn->cert_database) > 0)
+	{
+		char	   *cert_database_path = psprintf("sql:%s", conn->cert_database);
+
+		nss_context = NSS_InitContext(cert_database_path, "", "", "",
+									  &params,
+									  NSS_INIT_READONLY | NSS_INIT_PK11RELOAD);
+		pfree(cert_database_path);
+
+		if (!nss_context)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("unable to open certificate database \"%s\": %s"),
+							  conn->cert_database,
+							  pg_SSLerrmessage(PR_GetError()));
+			return PGRES_POLLING_FAILED;
+		}
+	}
+	else
+	{
+		nss_context = NSS_InitContext("", "", "", "", &params,
+									  NSS_INIT_READONLY | NSS_INIT_NOCERTDB |
+									  NSS_INIT_NOMODDB | NSS_INIT_FORCEOPEN |
+									  NSS_INIT_NOROOTINIT | NSS_INIT_PK11RELOAD);
+		if (!nss_context)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("unable to create certificate database: %s"),
+							  pg_SSLerrmessage(PR_GetError()));
+			return PGRES_POLLING_FAILED;
+		}
+	}
+
+	/*
+	 * Configure cipher policy.
+	 */
+	status = NSS_SetDomesticPolicy();
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to configure cipher policy: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * If we don't have a certificate database, the system trust store is the
+	 * fallback we can use. If we fail to initialize that as well, we can
+	 * still attempt a connection as long as the sslmode isn't verify*.
+	 */
+	if (!conn->cert_database && conn->sslmode[0] == 'v')
+	{
+		status = pg_load_nss_module(&ca_trust, ca_trust_name, "\"Root Certificates\"");
+		if (status != SECSuccess)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("WARNING: unable to load NSS trust module \"%s\" : %s"),
+							  ca_trust_name,
+							  pg_SSLerrmessage(PR_GetError()));
+
+			return PGRES_POLLING_FAILED;
+		}
+	}
+
+
+	PK11_SetPasswordFunc(PQssl_passwd_cb);
+
+	/*
+	 * Import the already opened socket as we don't want to use NSPR functions
+	 * for opening the network socket due to how the PostgreSQL protocol works
+	 * with TLS connections. This function is not part of the NSPR public API,
+	 * see the comment at the top of the file for the rationale of still using
+	 * it.
+	 */
+	pr_fd = PR_ImportTCPSocket(conn->sock);
+	if (!pr_fd)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to attach to socket: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * Most of the documentation available, and implementations of, NSS/NSPR
+	 * use the PR_NewTCPSocket() function here, which has the drawback that it
+	 * can only create IPv4 sockets. Instead use PR_OpenTCPSocket() which
+	 * copes with IPv6 as well.
+	 */
+	model = SSL_ImportFD(NULL, PR_OpenTCPSocket(conn->laddr.addr.ss_family));
+	if (!model)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to enable TLS: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/* Disable old protocol versions (SSLv2 and SSLv3) */
+	SSL_OptionSet(model, SSL_ENABLE_SSL2, PR_FALSE);
+	SSL_OptionSet(model, SSL_V2_COMPATIBLE_HELLO, PR_FALSE);
+	SSL_OptionSet(model, SSL_ENABLE_SSL3, PR_FALSE);
+
+#ifdef SSL_CBC_RANDOM_IV
+
+	/*
+	 * Enable protection against the BEAST attack in case the NSS library has
+	 * support for that. While SSLv3 is disabled, we may still allow TLSv1
+	 * which is affected. The option isn't documented as an SSL option, but as
+	 * an NSS environment variable.
+	 */
+	SSL_OptionSet(model, SSL_CBC_RANDOM_IV, PR_TRUE);
+#endif
+
+	/* Set us up as a TLS client for the handshake */
+	SSL_OptionSet(model, SSL_HANDSHAKE_AS_CLIENT, PR_TRUE);
+
+	/*
+	 * When setting the available protocols, we either use the user defined
+	 * configuration values, and if missing we accept whatever is the highest
+	 * version supported by the library as the max and only limit the range in
+	 * the other end at TLSv1.0. ssl_variant_stream is a ProtocolVariant enum
+	 * for Stream protocols, rather than datagram.
+	 */
+	SSL_VersionRangeGetSupported(ssl_variant_stream, &desired_range);
+	desired_range.min = SSL_LIBRARY_VERSION_TLS_1_0;
+
+	if (conn->ssl_min_protocol_version && strlen(conn->ssl_min_protocol_version) > 0)
+	{
+		int			ssl_min_ver = ssl_protocol_version_to_nss(conn->ssl_min_protocol_version);
+
+		if (ssl_min_ver == -1)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("invalid value \"%s\" for minimum version of SSL protocol\n"),
+							  conn->ssl_min_protocol_version);
+			return -1;
+		}
+
+		desired_range.min = ssl_min_ver;
+	}
+
+	if (conn->ssl_max_protocol_version && strlen(conn->ssl_max_protocol_version) > 0)
+	{
+		int			ssl_max_ver = ssl_protocol_version_to_nss(conn->ssl_max_protocol_version);
+
+		if (ssl_max_ver == -1)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("invalid value \"%s\" for maximum version of SSL protocol\n"),
+							  conn->ssl_max_protocol_version);
+			return -1;
+		}
+
+		desired_range.max = ssl_max_ver;
+	}
+
+	if (SSL_VersionRangeSet(model, &desired_range) != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to set allowed SSL protocol version range: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * Set up callback for verifying server certificates, as well as for how
+	 * to handle failed verifications.
+	 */
+	SSL_AuthCertificateHook(model, pg_cert_auth_handler, (void *) conn);
+	SSL_BadCertHook(model, pg_bad_cert_handler, (void *) conn);
+
+	/*
+	 * Convert the NSPR socket to an SSL socket. Ensuring the success of this
+	 * operation is critical as NSS SSL_* functions may return SECSuccess on
+	 * the socket even though SSL hasn't been enabled, which introduce a risk
+	 * of silent downgrades.
+	 */
+	conn->pr_fd = SSL_ImportFD(model, pr_fd);
+	if (!conn->pr_fd)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to configure client for TLS: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * The model can now we closed as we've applied the settings of the model
+	 * onto the real socket. From hereon we should only use conn->pr_fd.
+	 */
+	PR_Close(model);
+
+	/* Set the private data to be passed to the password callback */
+	SSL_SetPKCS11PinArg(conn->pr_fd, (void *) conn);
+
+	/*
+	 * If a CRL file has been specified, verify if it exists in the database
+	 * but don't fail in case it doesn't.
+	 */
+	if (conn->sslcrl && strlen(conn->sslcrl) > 0)
+	{
+		/* XXX: Implement me.. */
+	}
+
+	status = SSL_ResetHandshake(conn->pr_fd, PR_FALSE);
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to initiate handshake: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * Set callback for client authentication when requested by the server.
+	 */
+	SSL_GetClientAuthDataHook(conn->pr_fd, pg_client_auth_handler, (void *) conn);
+
+	/*
+	 * Specify which hostname we are expecting to talk to. This is required,
+	 * albeit mostly applies to when opening a connection to a traditional
+	 * http server it seems.
+	 */
+	SSL_SetURL(conn->pr_fd, (conn->connhost[conn->whichhost]).host);
+
+	do
+	{
+		status = SSL_ForceHandshake(conn->pr_fd);
+	}
+	while (status != SECSuccess && PR_GetError() == PR_WOULD_BLOCK_ERROR);
+
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("SSL error: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	conn->ssl_in_use = true;
+	return PGRES_POLLING_OK;
+}
+
+ssize_t
+pgtls_read(PGconn *conn, void *ptr, size_t len)
+{
+	PRInt32		nread;
+	PRErrorCode status;
+	int			read_errno = 0;
+
+	/*
+	 * PR_Recv blocks until there is data to read or the timeout expires. We
+	 * don't want to sit blocked here, so the timeout is turned off by using
+	 * PR_INTERVAL_NO_WAIT which means "return immediately",  Zero is returned
+	 * for closed connections, while -1 indicates an error within the ongoing
+	 * connection.
+	 */
+	nread = PR_Recv(conn->pr_fd, ptr, len, 0, PR_INTERVAL_NO_WAIT);
+
+	if (nread == 0)
+	{
+		read_errno = ECONNRESET;
+		nread = -1;
+	}
+	else if (nread == -1)
+	{
+		status = PR_GetError();
+
+		switch (status)
+		{
+			case PR_IO_TIMEOUT_ERROR:
+				/* No data available yet. */
+				nread = 0;
+				break;
+
+			case PR_WOULD_BLOCK_ERROR:
+				read_errno = EWOULDBLOCK;
+				break;
+
+				/*
+				 * The error cases for PR_Recv are not documented, but can be
+				 * reverse engineered from _MD_unix_map_default_error() in the
+				 * NSPR code, defined in pr/src/md/unix/unix_errors.c.
+				 */
+			case PR_NETWORK_UNREACHABLE_ERROR:
+			case PR_CONNECT_RESET_ERROR:
+				read_errno = ECONNRESET;
+				break;
+
+			default:
+				break;
+		}
+
+		if (nread == -1)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("TLS read error: %s"),
+							  pg_SSLerrmessage(status));
+		}
+	}
+
+	SOCK_ERRNO_SET(read_errno);
+	return (ssize_t) nread;
+}
+
+/*
+ * pgtls_read_pending
+ *		Check for the existence of data to be read.
+ *
+ * This is part of the PostgreSQL TLS backend API.
+ */
+bool
+pgtls_read_pending(PGconn *conn)
+{
+	unsigned char c;
+	int			n;
+
+	/*
+	 * PR_Recv peeks into the stream with the timeount turned off, to see if
+	 * there is another byte to read off the wire. There is an NSS function
+	 * SSL_DataPending() which might seem like a better fit, but it will only
+	 * check already encrypted data in the SSL buffer, not still unencrypted
+	 * data, thus it doesn't guarantee that a subsequent call to
+	 * PR_Read/PR_Recv won't block.
+	 */
+	n = PR_Recv(conn->pr_fd, &c, 1, PR_MSG_PEEK, PR_INTERVAL_NO_WAIT);
+	return (n > 0);
+}
+
+ssize_t
+pgtls_write(PGconn *conn, const void *ptr, size_t len)
+{
+	PRInt32		n;
+	PRErrorCode status;
+	int			write_errno = 0;
+
+	n = PR_Write(conn->pr_fd, ptr, len);
+
+	if (n < 0)
+	{
+		status = PR_GetError();
+
+		switch (status)
+		{
+			case PR_WOULD_BLOCK_ERROR:
+#ifdef EAGAIN
+				write_errno = EAGAIN;
+#else
+				write_errno = EINTR;
+#endif
+				break;
+
+			default:
+				printfPQExpBuffer(&conn->errorMessage,
+								  libpq_gettext("TLS write error: %s"),
+								  pg_SSLerrmessage(status));
+				write_errno = ECONNRESET;
+				break;
+		}
+	}
+
+	SOCK_ERRNO_SET(write_errno);
+	return (ssize_t) n;
+}
+
+char *
+pgtls_get_peer_certificate_hash(PGconn *conn, size_t *len)
+{
+	CERTCertificate *server_cert;
+	SECOidTag	signature_alg;
+	SECOidTag	digest_alg;
+	int			digest_len;
+	const NSSSignatureAlgorithms *candidate;
+	PLArenaPool *arena;
+	SECItem		digest;
+	char	   *ret;
+	SECStatus	status;
+
+	*len = 0;
+
+	server_cert = SSL_PeerCertificate(conn->pr_fd);
+	if (!server_cert)
+		return NULL;
+
+	signature_alg = SECOID_GetAlgorithmTag(&server_cert->signature);
+
+	candidate = NSS_SCRAMDigestAlgorithm;
+	while (candidate->signature)
+	{
+		if (signature_alg == candidate->signature)
+		{
+			digest_alg = candidate->hash;
+			digest_len = candidate->len;
+			break;
+		}
+
+		candidate++;
+	}
+
+	if (!candidate->signature)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("could not find digest for OID '%s'\n"),
+						  SECOID_FindOIDTagDescription(signature_alg));
+		return NULL;
+	}
+
+	arena = PORT_NewArena(SEC_ASN1_DEFAULT_ARENA_SIZE);
+	digest.data = PORT_ArenaZAlloc(arena, sizeof(unsigned char) * digest_len);
+	digest.len = digest_len;
+
+	status = PK11_HashBuf(digest_alg, digest.data, server_cert->derCert.data,
+						  server_cert->derCert.len);
+
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to generate peer certificate digest: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		PORT_FreeArena(arena, PR_TRUE);
+		return NULL;
+	}
+
+	ret = pg_malloc(digest.len);
+	memcpy(ret, digest.data, digest.len);
+	*len = digest_len;
+	PORT_FreeArena(arena, PR_TRUE);
+
+	return ret;
+}
+
+/*
+ *	Verify that the server certificate matches the hostname we connected to.
+ *
+ * The certificate's Common Name and Subject Alternative Names are considered.
+ */
+int
+pgtls_verify_peer_name_matches_certificate_guts(PGconn *conn,
+												int *names_examined,
+												char **first_name)
+{
+	char	   *server_hostname = NULL;
+	CERTCertificate *server_cert = NULL;
+	SECStatus	status = SECSuccess;
+	SECItem		altname_item;
+	PLArenaPool *arena = NULL;
+	CERTGeneralName *san_list;
+	CERTGeneralName *cn;
+
+	server_hostname = SSL_RevealURL(conn->pr_fd);
+	if (!server_hostname || server_hostname[0] == '\0')
+		goto done;
+
+	/*
+	 * CERT_VerifyCertName will internally perform RFC 2818 SubjectAltName
+	 * verification.
+	 */
+	server_cert = SSL_PeerCertificate(conn->pr_fd);
+	status = CERT_VerifyCertName(server_cert, server_hostname);
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to verify server hostname: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		goto done;
+	}
+
+	status = CERT_FindCertExtension(server_cert, SEC_OID_X509_SUBJECT_ALT_NAME,
+									&altname_item);
+	if (status == SECSuccess)
+	{
+		arena = PORT_NewArena(DER_DEFAULT_CHUNKSIZE);
+		if (!arena)
+		{
+			status = SECFailure;
+			goto done;
+		}
+		san_list = CERT_DecodeAltNameExtension(arena, &altname_item);
+		if (!san_list)
+		{
+			status = SECFailure;
+			goto done;
+		}
+
+		for (cn = san_list; cn != san_list; cn = CERT_GetNextGeneralName(cn))
+		{
+			char	   *alt_name;
+			int			rv;
+			char		tmp[512];
+
+			status = CERT_RFC1485_EscapeAndQuote(tmp, sizeof(tmp),
+												 (char *) cn->name.other.data,
+												 cn->name.other.len);
+
+			if (status != SECSuccess)
+				goto done;
+
+			rv = pq_verify_peer_name_matches_certificate_name(conn, tmp,
+															  strlen(tmp),
+															  &alt_name);
+			if (alt_name)
+			{
+				if (!*first_name)
+					*first_name = alt_name;
+				else
+					free(alt_name);
+			}
+
+			if (rv == 1)
+				status = SECSuccess;
+			else
+			{
+				status = SECFailure;
+				break;
+			}
+		}
+	}
+	else if (PORT_GetError() == SEC_ERROR_EXTENSION_NOT_FOUND)
+		status = SECSuccess;
+	else
+		status = SECSuccess;
+
+done:
+	/* san_list will be freed by freeing the arena it was allocated in */
+	if (arena)
+		PORT_FreeArena(arena, PR_TRUE);
+	PR_Free(server_hostname);
+
+	if (status == SECSuccess)
+		return 1;
+
+	return 0;
+}
+
+/* ------------------------------------------------------------ */
+/*			PostgreSQL specific TLS support functions			*/
+/* ------------------------------------------------------------ */
+
+static const char *
+pg_SSLerrmessage(PRErrorCode errcode)
+{
+	const char *error;
+
+	/*
+	 * Try to get the user friendly error description, and if that fails try
+	 * to fall back on the name of the PRErrorCode.
+	 */
+	error = PR_ErrorToString(errcode, PR_LANGUAGE_I_DEFAULT);
+	if (!error)
+		error = PR_ErrorToName(errcode);
+	if (error)
+		return error;
+
+	return "unknown TLS error";
+}
+
+static SECStatus
+pg_load_nss_module(SECMODModule * *module, const char *library, const char *name)
+{
+	SECMODModule *mod;
+	char	   *modulespec;
+
+	modulespec = psprintf("library=\"%s\", name=\"%s\"", library, name);
+
+	/*
+	 * Attempt to load the specified module. The second parameter is "parent"
+	 * which should always be NULL for application code. The third parameter
+	 * defines if loading should recurse which is only applicable when loading
+	 * a module from within another module. This hierarchy would have to be
+	 * defined in the modulespec, and since we don't support anything but
+	 * directly addressed modules we should pass PR_FALSE.
+	 */
+	mod = SECMOD_LoadUserModule(modulespec, NULL, PR_FALSE);
+	pfree(modulespec);
+
+	if (mod && mod->loaded)
+	{
+		*module = mod;
+		return SECSuccess;
+	}
+
+	SECMOD_DestroyModule(mod);
+	return SECFailure;
+}
+
+/* ------------------------------------------------------------ */
+/*						NSS Callbacks							*/
+/* ------------------------------------------------------------ */
+
+/*
+ * pg_cert_auth_handler
+ *			Callback for authenticating server certificate
+ *
+ * This is pretty much the same procedure as the SSL_AuthCertificate function
+ * provided by NSS, with the difference being server hostname validation. With
+ * SSL_AuthCertificate there is no way to do verify-ca, it only does the -full
+ * flavor of our sslmodes, so we need our own implementation.
+ */
+static SECStatus
+pg_cert_auth_handler(void *arg, PRFileDesc *fd, PRBool checksig, PRBool isServer)
+{
+	SECStatus	status;
+	PGconn	   *conn = (PGconn *) arg;
+	CERTCertificate *server_cert;
+	void	   *pin;
+
+	Assert(!isServer);
+
+	pin = SSL_RevealPinArg(conn->pr_fd);
+	server_cert = SSL_PeerCertificate(conn->pr_fd);
+
+	status = CERT_VerifyCertificateNow((CERTCertDBHandle *) CERT_GetDefaultCertDB(),
+									   server_cert,
+									   checksig,
+									   certificateUsageSSLServer,
+									   pin,
+									   NULL);
+
+	/*
+	 * If we've already failed validation then there is no point in also
+	 * performing the hostname check for verify-full.
+	 */
+	if (status == SECSuccess)
+	{
+		if (!pq_verify_peer_name_matches_certificate(conn))
+			status = SECFailure;
+	}
+	else
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to verify certificate: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+	}
+
+	return status;
+}
+
+/*
+ * pg_client_auth_handler
+ *		Callback for client certificate validation
+ *
+ * The client auth callback is not on by default in NSS, so we need to invoke
+ * it ourselves to ensure we can do cert authentication. A TODO is to support
+ * running without a specified sslcert parameter. By retrieving all the certs
+ * via nickname from the cert database and see if we find one which apply with
+ * NSS_CmpCertChainWCANames() and PK11_FindKeyByAnyCert() we could support
+ * just running with a ssl database specified.
+ *
+ * For now, we use the default client certificate validation which requires a
+ * defined nickname to identify the cert in the database.
+ */
+static SECStatus
+pg_client_auth_handler(void *arg, PRFileDesc * socket, CERTDistNames * caNames,
+					   CERTCertificate * *pRetCert, SECKEYPrivateKey * *pRetKey)
+{
+	PGconn	   *conn = (PGconn *) arg;
+
+	return NSS_GetClientAuthData(conn->sslcert, socket, caNames, pRetCert, pRetKey);
+}
+
+/*
+ * pg_bad_cert_handler
+ *		Callback for failed certificate validation
+ *
+ * The TLS handshake will call this function iff the server certificate failed
+ * validation. Depending on the sslmode, we allow the connection anyways.
+ */
+static SECStatus
+pg_bad_cert_handler(void *arg, PRFileDesc * fd)
+{
+	PGconn	   *conn = (PGconn *) arg;
+	PRErrorCode err;
+
+	/*
+	 * This really shouldn't happen, as we've set the PGconn object as our
+	 * callback data, and at the callsite we know it will be populated. That
+	 * being said, the NSS code itself performs this check even when it should
+	 * not be required so let's use the same belts with our suspenders.
+	 */
+	if (!arg)
+		return SECFailure;
+
+	/*
+	 * For sslmodes other than verify-full and verify-ca we don't perform peer
+	 * validation, so return immediately.  sslmode require with a database
+	 * specified which contains a CA certificate will work like verify-ca to
+	 * be compatible with the OpenSSL implementation.
+	 */
+	if (strcmp(conn->sslmode, "require") == 0)
+	{
+		if (conn->cert_database && strlen(conn->cert_database) > 0 && cert_database_has_CA(conn))
+			return SECFailure;
+	}
+	if (conn->sslmode[0] == 'v')
+		return SECFailure;
+
+	err = PORT_GetError();
+
+	/*
+	 * TODO: these are relevant error codes that can occur in certificate
+	 * validation, figure out which we don't want for require/prefer etc.
+	 */
+	switch (err)
+	{
+		case SEC_ERROR_INVALID_AVA:
+		case SEC_ERROR_INVALID_TIME:
+		case SEC_ERROR_BAD_SIGNATURE:
+		case SEC_ERROR_EXPIRED_CERTIFICATE:
+		case SEC_ERROR_UNKNOWN_ISSUER:
+		case SEC_ERROR_UNTRUSTED_ISSUER:
+		case SEC_ERROR_UNTRUSTED_CERT:
+		case SEC_ERROR_CERT_VALID:
+		case SEC_ERROR_EXPIRED_ISSUER_CERTIFICATE:
+		case SEC_ERROR_CRL_EXPIRED:
+		case SEC_ERROR_CRL_BAD_SIGNATURE:
+		case SEC_ERROR_EXTENSION_VALUE_INVALID:
+		case SEC_ERROR_CA_CERT_INVALID:
+		case SEC_ERROR_CERT_USAGES_INVALID:
+		case SEC_ERROR_UNKNOWN_CRITICAL_EXTENSION:
+			return SECSuccess;
+			break;
+		default:
+			return SECFailure;
+			break;
+	}
+
+	/* Unreachable */
+	return SECSuccess;
+}
+
+/* ------------------------------------------------------------ */
+/*					SSL information functions					*/
+/* ------------------------------------------------------------ */
+
+/*
+ * PQgetssl
+ *
+ * Return NULL as this is legacy and defined to always be equal to calling
+ * PQsslStruct(conn, "OpenSSL"); This should ideally trigger a logged warning
+ * somewhere as it's nonsensical to run in a non-OpenSSL build, but the color
+ * of said bikeshed hasn't yet been determined.
+ */
+void *
+PQgetssl(PGconn *conn)
+{
+	return NULL;
+}
+
+void *
+PQsslStruct(PGconn *conn, const char *struct_name)
+{
+	if (!conn)
+		return NULL;
+
+	/*
+	 * Return the underlying PRFileDesc which can be used to access
+	 * information on the connection details. There is no SSL context per se.
+	 */
+	if (strcmp(struct_name, "NSS") == 0)
+		return conn->pr_fd;
+	return NULL;
+}
+
+const char *const *
+PQsslAttributeNames(PGconn *conn)
+{
+	static const char *const result[] = {
+		"library",
+		"cipher",
+		"protocol",
+		"key_bits",
+		"compression",
+		NULL
+	};
+
+	return result;
+}
+
+const char *
+PQsslAttribute(PGconn *conn, const char *attribute_name)
+{
+	SECStatus	status;
+	SSLChannelInfo channel;
+	SSLCipherSuiteInfo suite;
+
+	if (!conn || !conn->pr_fd)
+		return NULL;
+
+	if (strcmp(attribute_name, "library") == 0)
+		return "NSS";
+
+	status = SSL_GetChannelInfo(conn->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+		return NULL;
+
+	status = SSL_GetCipherSuiteInfo(channel.cipherSuite, &suite, sizeof(suite));
+	if (status != SECSuccess)
+		return NULL;
+
+	if (strcmp(attribute_name, "cipher") == 0)
+		return suite.cipherSuiteName;
+
+	if (strcmp(attribute_name, "key_bits") == 0)
+	{
+		static char key_bits_str[8];
+
+		snprintf(key_bits_str, sizeof(key_bits_str), "%i", suite.effectiveKeyBits);
+		return key_bits_str;
+	}
+
+	if (strcmp(attribute_name, "protocol") == 0)
+	{
+		switch (channel.protocolVersion)
+		{
+#ifdef SSL_LIBRARY_VERSION_TLS_1_3
+			case SSL_LIBRARY_VERSION_TLS_1_3:
+				return "TLSv1.3";
+#endif
+#ifdef SSL_LIBRARY_VERSION_TLS_1_2
+			case SSL_LIBRARY_VERSION_TLS_1_2:
+				return "TLSv1.2";
+#endif
+#ifdef SSL_LIBRARY_VERSION_TLS_1_1
+			case SSL_LIBRARY_VERSION_TLS_1_1:
+				return "TLSv1.1";
+#endif
+			case SSL_LIBRARY_VERSION_TLS_1_0:
+				return "TLSv1.0";
+			default:
+				return "unknown";
+		}
+	}
+
+	/*
+	 * NSS disabled support for compression in version 3.33, and it was only
+	 * available for SSLv3 at that point anyways, so we can safely return off
+	 * here without checking.
+	 */
+	if (strcmp(attribute_name, "compression") == 0)
+		return "off";
+
+	return NULL;
+}
+
+static int
+ssl_protocol_version_to_nss(const char *protocol)
+{
+	if (pg_strcasecmp("TLSv1", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_0;
+
+#ifdef SSL_LIBRARY_VERSION_TLS_1_1
+	if (pg_strcasecmp("TLSv1.1", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_1;
+#endif
+
+#ifdef SSL_LIBRARY_VERSION_TLS_1_2
+	if (pg_strcasecmp("TLSv1.2", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_2;
+#endif
+
+#ifdef SSL_LIBRARY_VERSION_TLS_1_3
+	if (pg_strcasecmp("TLSv1.3", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_3;
+#endif
+
+	return -1;
+}
+
+/*
+ * cert_database_has_CA
+ *
+ * Returns true in case there is a CA certificate in the database connected
+ * to in the conn object, else false. This function only checks for the
+ * presence of a CA certificate, not it's validity and/or usefulness.
+ */
+static bool
+cert_database_has_CA(PGconn *conn)
+{
+	CERTCertList *certificates;
+	bool		hasCA;
+
+	/*
+	 * If the certificate database has a password we must provide it, since
+	 * this API doesn't invoke the standard password callback.
+	 */
+	if (conn->has_password)
+		certificates = PK11_ListCerts(PK11CertListCA, PQssl_passwd_cb(NULL, PR_FALSE, (void *) conn));
+	else
+		certificates = PK11_ListCerts(PK11CertListCA, NULL);
+	hasCA = !CERT_LIST_EMPTY(certificates);
+	CERT_DestroyCertList(certificates);
+
+	return hasCA;
+}
+
+PQsslKeyPassHook_nss_type
+PQgetSSLKeyPassHook_nss(void)
+{
+	return PQsslKeyPassHook;
+}
+
+void
+PQsetSSLKeyPassHook_nss(PQsslKeyPassHook_nss_type hook)
+{
+	PQsslKeyPassHook = hook;
+}
+
+/*
+ * Supply a password to decrypt a client certificate.
+ *
+ * This must match NSS type PK11PasswordFunc.
+ */
+static char *
+PQssl_passwd_cb(PK11SlotInfo *slot, PRBool retry, void *arg)
+{
+	PGconn	   *conn = (PGconn *) arg;
+
+	conn->has_password = true;
+
+	if (PQsslKeyPassHook)
+		return PQsslKeyPassHook(slot, (PRBool) retry, arg);
+	else
+		return PQdefaultSSLKeyPassHook_nss(slot, retry, arg);
+}
+
+/*
+ * The default password handler callback.
+ */
+char *
+PQdefaultSSLKeyPassHook_nss(PK11SlotInfo * slot, PRBool retry, void *arg)
+{
+	PGconn	   *conn = (PGconn *) arg;
+
+	/*
+	 * If the password didn't work the first time there is no point in
+	 * retrying as it hasn't changed.
+	 */
+	if (retry != PR_TRUE && conn->sslpassword && strlen(conn->sslpassword) > 0)
+		return PORT_Strdup(conn->sslpassword);
+
+	return NULL;
+}
diff --git a/src/interfaces/libpq/fe-secure.c b/src/interfaces/libpq/fe-secure.c
index 67b1e78512..0a1e47c5a2 100644
--- a/src/interfaces/libpq/fe-secure.c
+++ b/src/interfaces/libpq/fe-secure.c
@@ -427,6 +427,9 @@ PQsslAttributeNames(PGconn *conn)
 
 	return result;
 }
+#endif							/* USE_SSL */
+
+#ifndef USE_OPENSSL
 
 PQsslKeyPassHook_OpenSSL_type
 PQgetSSLKeyPassHook_OpenSSL(void)
@@ -445,7 +448,7 @@ PQdefaultSSLKeyPassHook_OpenSSL(char *buf, int size, PGconn *conn)
 {
 	return 0;
 }
-#endif							/* USE_SSL */
+#endif							/* USE_OPENSSL */
 
 /* Dummy version of GSSAPI information functions, when built without GSS support */
 #ifndef ENABLE_GSS
diff --git a/src/interfaces/libpq/libpq-fe.h b/src/interfaces/libpq/libpq-fe.h
index c266ad5b13..aba32e6635 100644
--- a/src/interfaces/libpq/libpq-fe.h
+++ b/src/interfaces/libpq/libpq-fe.h
@@ -619,12 +619,23 @@ extern int	pg_valid_server_encoding_id(int encoding);
 
 /* === in fe-secure-openssl.c === */
 
-/* Support for overriding sslpassword handling with a callback. */
+/* Support for overriding sslpassword handling with a callback */
 typedef int (*PQsslKeyPassHook_OpenSSL_type) (char *buf, int size, PGconn *conn);
 extern PQsslKeyPassHook_OpenSSL_type PQgetSSLKeyPassHook_OpenSSL(void);
 extern void PQsetSSLKeyPassHook_OpenSSL(PQsslKeyPassHook_OpenSSL_type hook);
 extern int	PQdefaultSSLKeyPassHook_OpenSSL(char *buf, int size, PGconn *conn);
 
+/* == in fe-secure-nss.c === */
+typedef struct PK11SlotInfoStr PK11SlotInfo;
+typedef int PRIntn;
+typedef PRIntn PRBool;
+
+/* Support for overriding sslpassword handling with a callback */
+typedef char *(*PQsslKeyPassHook_nss_type) (PK11SlotInfo *slot, PRBool retry, void *arg);
+extern PQsslKeyPassHook_nss_type PQgetSSLKeyPassHook_nss(void);
+extern void PQsetSSLKeyPassHook_nss(PQsslKeyPassHook_nss_type hook);
+extern char *PQdefaultSSLKeyPassHook_nss(PK11SlotInfo *slot, PRBool retry, void *arg);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/src/interfaces/libpq/libpq-int.h b/src/interfaces/libpq/libpq-int.h
index 4db498369c..a95450fbba 100644
--- a/src/interfaces/libpq/libpq-int.h
+++ b/src/interfaces/libpq/libpq-int.h
@@ -362,6 +362,7 @@ struct pg_conn
 	char	   *sslpassword;	/* client key file password */
 	char	   *sslrootcert;	/* root certificate filename */
 	char	   *sslcrl;			/* certificate revocation list filename */
+	char	   *cert_database;	/* NSS certificate/key database */
 	char	   *requirepeer;	/* required peer credentials for local sockets */
 	char	   *gssencmode;		/* GSS mode (require,prefer,disable) */
 	char	   *krbsrvname;		/* Kerberos service name */
@@ -485,6 +486,23 @@ struct pg_conn
 								 * OpenSSL version changes */
 #endif
 #endif							/* USE_OPENSSL */
+
+#ifdef USE_NSS
+	void	   *pr_fd;			/* NSPR file descriptor for the connection */
+
+	/*
+	 * Track whether the NSS database has a password set or not. There is no
+	 * API function for retrieving password status of a database, but we need
+	 * to know since some NSS API calls require the password passed in (they
+	 * don't call the callback themselves). To track, we simply flip this to
+	 * true in case NSS invoked the password callback - as that will only
+	 * happen in case there is a password. The reason for tracking this is
+	 * that there are calls which require a password parameter, but doesn't
+	 * use the callbacks provided, so we must call the callback on behalf of
+	 * these.
+	 */
+	bool		has_password;
+#endif							/* USE_NSS */
 #endif							/* USE_SSL */
 
 #ifdef ENABLE_GSS
@@ -759,7 +777,7 @@ extern ssize_t pgtls_write(PGconn *conn, const void *ptr, size_t len);
  * This is not supported with old versions of OpenSSL that don't have
  * the X509_get_signature_nid() function.
  */
-#if defined(USE_OPENSSL) && defined(HAVE_X509_GET_SIGNATURE_NID)
+#if defined(USE_NSS) || (defined(USE_OPENSSL) && defined(HAVE_X509_GET_SIGNATURE_NID))
 #define HAVE_PGTLS_GET_PEER_CERTIFICATE_HASH
 extern char *pgtls_get_peer_certificate_hash(PGconn *conn, size_t *len);
 #endif
diff --git a/src/tools/msvc/Mkvcbuild.pm b/src/tools/msvc/Mkvcbuild.pm
index 5634b2d40c..a21eb088b3 100644
--- a/src/tools/msvc/Mkvcbuild.pm
+++ b/src/tools/msvc/Mkvcbuild.pm
@@ -194,12 +194,19 @@ sub mkvcbuild
 	$postgres->FullExportDLL('postgres.lib');
 
 	# The OBJS scraper doesn't know about ifdefs, so remove appropriate files
-	# if building without OpenSSL.
-	if (!$solution->{options}->{openssl})
+	# if building without various options.
+	if (!$solution->{options}->{openssl} && !$solution->{options}->{nss})
 	{
 		$postgres->RemoveFile('src/backend/libpq/be-secure-common.c');
+	}
+	if (!$solution->{options}->{openssl})
+	{
 		$postgres->RemoveFile('src/backend/libpq/be-secure-openssl.c');
 	}
+	if (!$solution->{options}->{nss})
+	{
+		$postgres->RemoveFile('src/backend/libpq/be-secure-nss.c');
+	}
 	if (!$solution->{options}->{gss})
 	{
 		$postgres->RemoveFile('src/backend/libpq/be-gssapi-common.c');
@@ -257,12 +264,19 @@ sub mkvcbuild
 	$libpq->AddReference($libpgcommon, $libpgport);
 
 	# The OBJS scraper doesn't know about ifdefs, so remove appropriate files
-	# if building without OpenSSL.
-	if (!$solution->{options}->{openssl})
+	# if building without various options
+	if (!$solution->{options}->{openssl} && !$solution->{options}->{nss})
 	{
 		$libpq->RemoveFile('src/interfaces/libpq/fe-secure-common.c');
+	}
+	if (!$solution->{options}->{openssl})
+	{
 		$libpq->RemoveFile('src/interfaces/libpq/fe-secure-openssl.c');
 	}
+	if (!$solution->{options}->{nss})
+	{
+		$libpq->RemoveFile('src/interfaces/libpq/fe-secure-nss.c');
+	}
 	if (!$solution->{options}->{gss})
 	{
 		$libpq->RemoveFile('src/interfaces/libpq/fe-gssapi-common.c');
diff --git a/src/tools/msvc/Solution.pm b/src/tools/msvc/Solution.pm
index 59a42bea97..d3d0ea3c95 100644
--- a/src/tools/msvc/Solution.pm
+++ b/src/tools/msvc/Solution.pm
@@ -488,6 +488,7 @@ sub GenerateFiles
 		USE_LLVM                   => undef,
 		USE_NAMED_POSIX_SEMAPHORES => undef,
 		USE_OPENSSL                => undef,
+		USE_NSS                    => undef,
 		USE_PAM                    => undef,
 		USE_SLICING_BY_8_CRC32C    => undef,
 		USE_SSE42_CRC32C           => undef,
@@ -540,6 +541,10 @@ sub GenerateFiles
 			$define{HAVE_OPENSSL_INIT_SSL}      = 1;
 		}
 	}
+	if ($self->{options}->{nss})
+	{
+		$define{USE_NSS} = 1;
+	}
 
 	$self->GenerateConfigHeader('src/include/pg_config.h',     \%define, 1);
 	$self->GenerateConfigHeader('src/include/pg_config_ext.h', \%define, 0);
@@ -1005,6 +1010,21 @@ sub AddProject
 			}
 		}
 	}
+	if ($self->{options}->{nss})
+	{
+		$proj->AddIncludeDir($self->{options}->{nss} . '\..\public\nss');
+		$proj->AddIncludeDir($self->{options}->{nss} . '\include\nspr');
+		foreach my $lib (qw(plds4 plc4 nspr4))
+		{
+			$proj->AddLibrary($self->{options}->{nss} .
+							  '\lib\lib' . "$lib.lib", 0);
+		}
+		foreach my $lib (qw(ssl3 smime3 nss3))
+		{
+			$proj->AddLibrary($self->{options}->{nss} .
+							  '\lib' . "\\$lib.dll.lib", 0);
+		}
+	}
 	if ($self->{options}->{nls})
 	{
 		$proj->AddIncludeDir($self->{options}->{nls} . '\include');
diff --git a/src/tools/msvc/config_default.pl b/src/tools/msvc/config_default.pl
index 2ef2cfc4e9..49dc4d5864 100644
--- a/src/tools/msvc/config_default.pl
+++ b/src/tools/msvc/config_default.pl
@@ -17,6 +17,7 @@ our $config = {
 	perl      => undef,    # --with-perl=<path>
 	python    => undef,    # --with-python=<path>
 	openssl   => undef,    # --with-openssl=<path>
+	nss       => undef,    # --with-nss=<path>
 	uuid      => undef,    # --with-uuid=<path>
 	xml       => undef,    # --with-libxml=<path>
 	xslt      => undef,    # --with-libxslt=<path>
-- 
2.21.1 (Apple Git-122.3)

From 0c3bce7acbc845aca31251bcc5c564de39aa5f97 Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Wed, 28 Oct 2020 11:22:26 +0100
Subject: [PATCH v22 2/6] NSS Testharness updates

TODO:
	* Generate certificate/keys with NSS tooling for NSS specific test
	* Add test for certificate with embedded nulls
	* Fix SCRAM tests when channel binding works
---
 src/test/Makefile                             |   2 +-
 src/test/modules/Makefile                     |   2 +-
 .../modules/ssl_passphrase_callback/Makefile  |   2 +-
 .../ssl_passphrase_callback/t/001_testfunc.pl |   4 +-
 src/test/ssl/Makefile                         | 235 +++++++++++-
 src/test/ssl/t/001_ssltests.pl                | 346 +++++++++++-------
 src/test/ssl/t/002_scram.pl                   |  97 +++--
 src/test/ssl/t/SSL/Backend/NSS.pm             |  73 ++++
 src/test/ssl/t/SSL/Backend/OpenSSL.pm         | 103 ++++++
 .../ssl/t/{SSLServer.pm => SSL/Server.pm}     |  80 +++-
 10 files changed, 749 insertions(+), 195 deletions(-)
 create mode 100644 src/test/ssl/t/SSL/Backend/NSS.pm
 create mode 100644 src/test/ssl/t/SSL/Backend/OpenSSL.pm
 rename src/test/ssl/t/{SSLServer.pm => SSL/Server.pm} (78%)

diff --git a/src/test/Makefile b/src/test/Makefile
index ab1ef9a475..cee4586eb5 100644
--- a/src/test/Makefile
+++ b/src/test/Makefile
@@ -28,7 +28,7 @@ ifneq (,$(filter ldap,$(PG_TEST_EXTRA)))
 SUBDIRS += ldap
 endif
 endif
-ifeq ($(with_openssl),yes)
+ifeq ($(with_ssl),yes)
 ifneq (,$(filter ssl,$(PG_TEST_EXTRA)))
 SUBDIRS += ssl
 endif
diff --git a/src/test/modules/Makefile b/src/test/modules/Makefile
index 59921b46cf..5391f461a2 100644
--- a/src/test/modules/Makefile
+++ b/src/test/modules/Makefile
@@ -28,7 +28,7 @@ SUBDIRS = \
 		  unsafe_tests \
 		  worker_spi
 
-ifeq ($(with_openssl),yes)
+ifeq ($(with_ssl),openssl)
 SUBDIRS += ssl_passphrase_callback
 else
 ALWAYS_SUBDIRS += ssl_passphrase_callback
diff --git a/src/test/modules/ssl_passphrase_callback/Makefile b/src/test/modules/ssl_passphrase_callback/Makefile
index f81265c296..a34d7ea46a 100644
--- a/src/test/modules/ssl_passphrase_callback/Makefile
+++ b/src/test/modules/ssl_passphrase_callback/Makefile
@@ -1,6 +1,6 @@
 # ssl_passphrase_callback Makefile
 
-export with_openssl
+export with_ssl
 
 MODULE_big = ssl_passphrase_func
 OBJS = ssl_passphrase_func.o $(WIN32RES)
diff --git a/src/test/modules/ssl_passphrase_callback/t/001_testfunc.pl b/src/test/modules/ssl_passphrase_callback/t/001_testfunc.pl
index dbc084f870..a2bed5336c 100644
--- a/src/test/modules/ssl_passphrase_callback/t/001_testfunc.pl
+++ b/src/test/modules/ssl_passphrase_callback/t/001_testfunc.pl
@@ -7,9 +7,9 @@ use TestLib;
 use Test::More;
 use PostgresNode;
 
-unless (($ENV{with_openssl} || 'no') eq 'yes')
+unless ($ENV{with_ssl} eq 'openssl')
 {
-	plan skip_all => 'SSL not supported by this build';
+	plan skip_all => 'OpenSSL not supported by this build';
 }
 
 my $clearpass = "FooBaR1";
diff --git a/src/test/ssl/Makefile b/src/test/ssl/Makefile
index 93335b1ea2..d275c89672 100644
--- a/src/test/ssl/Makefile
+++ b/src/test/ssl/Makefile
@@ -13,7 +13,7 @@ subdir = src/test/ssl
 top_builddir = ../../..
 include $(top_builddir)/src/Makefile.global
 
-export with_openssl
+export with_ssl
 
 CERTIFICATES := server_ca server-cn-and-alt-names \
 	server-cn-only server-single-alt-name server-multiple-alt-names \
@@ -30,6 +30,35 @@ SSLFILES := $(CERTIFICATES:%=ssl/%.key) $(CERTIFICATES:%=ssl/%.crt) \
 	ssl/client+client_ca.crt ssl/client-der.key \
 	ssl/client-encrypted-pem.key ssl/client-encrypted-der.key
 
+# Even though we in practice could get away with far fewer NSS databases, they
+# are generated to mimic the setup for the OpenSSL tests in order to ensure
+# we isolate the same behavior between the backends. The database name should
+# contain the files included for easier test suite code reading.
+NSSFILES := ssl/nss/client_ca.crt.db \
+	ssl/nss/server_ca.crt.db \
+	ssl/nss/root+server_ca.crt.db \
+	ssl/nss/root+client_ca.crt.db \
+	ssl/nss/client.crt__client.key.db \
+	ssl/nss/client-revoked.crt__client-revoked.key.db \
+	ssl/nss/server-cn-only.crt__server-password.key.db \
+	ssl/nss/server-cn-only.crt__server-cn-only.key.db \
+	ssl/nss/root.crl \
+	ssl/nss/server.crl \
+	ssl/nss/client.crl \
+	ssl/nss/server-multiple-alt-names.crt__server-multiple-alt-names.key.db \
+	ssl/nss/server-single-alt-name.crt__server-single-alt-name.key.db \
+	ssl/nss/server-cn-and-alt-names.crt__server-cn-and-alt-names.key.db \
+	ssl/nss/server-no-names.crt__server-no-names.key.db \
+	ssl/nss/server-revoked.crt__server-revoked.key.db \
+	ssl/nss/root+client.crl \
+	ssl/nss/client+client_ca.crt__client.key.db \
+	ssl/nss/client.crt__client-encrypted-pem.key.db \
+	ssl/nss/root+server_ca.crt__server.crl.db \
+	ssl/nss/root+server_ca.crt__root+server.crl.db \
+	ssl/nss/native_ca-root.db \
+	ssl/nss/native_server-root.db \
+	ssl/nss/native_client-root.db
+
 # This target re-generates all the key and certificate files. Usually we just
 # use the ones that are committed to the tree without rebuilding them.
 #
@@ -37,6 +66,10 @@ SSLFILES := $(CERTIFICATES:%=ssl/%.key) $(CERTIFICATES:%=ssl/%.crt) \
 #
 sslfiles: $(SSLFILES)
 
+# Generate NSS certificate databases corresponding to the OpenSSL certificates.
+# This target will fail unless preceded by nssfiles-clean.
+nssfiles: $(NSSFILES)
+
 # OpenSSL requires a directory to put all generated certificates in. We don't
 # use this for anything, but we need a location.
 ssl/new_certs_dir:
@@ -64,6 +97,24 @@ ssl/%_ca.crt: ssl/%_ca.key %_ca.config ssl/root_ca.crt ssl/new_certs_dir
 	rm ssl/temp_ca.crt ssl/temp_ca_signed.crt
 	echo "01" > ssl/$*_ca.srl
 
+ssl/nss/%_ca.crt.db: ssl/%_ca.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n $*_ca.crt -i ssl/$*_ca.crt -t "CT,C,C"
+
+ssl/nss/root+server_ca.crt__server.crl.db: ssl/root+server_ca.crt ssl/nss/server.crl
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	crlutil -I -i ssl/nss/server.crl -d $@ -B
+
+ssl/nss/root+server_ca.crt__root+server.crl.db: ssl/root+server_ca.crt ssl/nss/root.crl ssl/nss/server.crl
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	crlutil -I -i ssl/nss/root.crl -d $@ -B
+	crlutil -I -i ssl/nss/server.crl -d $@ -B
+
 # Server certificates, signed by server CA:
 ssl/server-%.crt: ssl/server-%.key ssl/server_ca.crt server-%.config
 	openssl req -new -key ssl/server-$*.key -out ssl/server-$*.csr -config server-$*.config
@@ -77,6 +128,78 @@ ssl/server-ss.crt: ssl/server-cn-only.key ssl/server-cn-only.crt server-cn-only.
 	openssl x509 -req -days 10000 -in ssl/server-ss.csr -signkey ssl/server-cn-only.key -out ssl/server-ss.crt  -extensions v3_req -extfile server-cn-only.config
 	rm ssl/server-ss.csr
 
+# pk12util won't preserve the password when importing the password protected
+# key, the password must be set on the database *before* importing it as the
+# password in the pkcs12 envelope will be dropped.
+ssl/nss/server-cn-only.crt__server-password.key.db: ssl/server-cn-only.crt
+	$(MKDIR_P) $@
+	echo "secret1" > password.txt
+	certutil -d "sql:$@" -N -f password.txt
+	certutil -d "sql:$@" -A -n ssl/server-cn-only.crt -i ssl/server-cn-only.crt -t "CT,C,C" -f password.txt
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C" -f password.txt
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C" -f password.txt
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C" -f password.txt
+	openssl pkcs12 -export -out ssl/nss/server-password.pfx -inkey ssl/server-password.key -in ssl/server-cn-only.crt -certfile ssl/server_ca.crt -passin 'pass:secret1' -passout 'pass:secret1'
+	pk12util -i ssl/nss/server-password.pfx -d "sql:$@" -W 'secret1' -K 'secret1'
+
+ssl/nss/server-cn-only.crt__server-cn-only.key.db: ssl/server-cn-only.crt ssl/server-cn-only.key
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-cn-only.crt -i ssl/server-cn-only.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-cn-only.pfx -inkey ssl/server-cn-only.key -in ssl/server-cn-only.crt -certfile ssl/server_ca.crt -passout pass:
+	pk12util -i ssl/nss/server-cn-only.pfx -d "sql:$@" -W ''
+
+ssl/nss/server-multiple-alt-names.crt__server-multiple-alt-names.key.db: ssl/server-multiple-alt-names.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-multiple-alt-names.crt -i ssl/server-multiple-alt-names.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-multiple-alt-names.pfx -inkey ssl/server-multiple-alt-names.key -in ssl/server-multiple-alt-names.crt -certfile ssl/server-multiple-alt-names.crt -passout pass:
+	pk12util -i ssl/nss/server-multiple-alt-names.pfx -d "sql:$@" -W ''
+
+ssl/nss/server-single-alt-name.crt__server-single-alt-name.key.db: ssl/server-single-alt-name.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-single-alt-name.crt -i ssl/server-single-alt-name.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-single-alt-name.pfx -inkey ssl/server-single-alt-name.key -in ssl/server-single-alt-name.crt -certfile ssl/server-single-alt-name.crt -passout pass:
+	pk12util -i ssl/nss/server-single-alt-name.pfx -d "sql:$@" -W ''
+
+ssl/nss/server-cn-and-alt-names.crt__server-cn-and-alt-names.key.db: ssl/server-cn-and-alt-names.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-cn-and-alt-names.crt -i ssl/server-cn-and-alt-names.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-cn-and-alt-names.pfx -inkey ssl/server-cn-and-alt-names.key -in ssl/server-cn-and-alt-names.crt -certfile ssl/server-cn-and-alt-names.crt -passout pass:
+	pk12util -i ssl/nss/server-cn-and-alt-names.pfx -d $@ -W ''
+
+ssl/nss/server-no-names.crt__server-no-names.key.db: ssl/server-no-names.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-no-names.crt -i ssl/server-no-names.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-no-names.pfx -inkey ssl/server-no-names.key -in ssl/server-no-names.crt -certfile ssl/server-no-names.crt -passout pass:
+	pk12util -i ssl/nss/server-no-names.pfx -d "sql:$@" -W ''
+
+ssl/nss/server-revoked.crt__server-revoked.key.db: ssl/server-revoked.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-revoked.crt -i ssl/server-revoked.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-revoked.pfx -inkey ssl/server-revoked.key -in ssl/server-revoked.crt -certfile ssl/server-revoked.crt -passout pass:
+	pk12util -i ssl/nss/server-revoked.pfx -d "sql:$@" -W ''
+
 # Password-protected version of server-cn-only.key
 ssl/server-password.key: ssl/server-cn-only.key
 	openssl rsa -aes256 -in $< -out $@ -passout 'pass:secret1'
@@ -88,6 +211,27 @@ ssl/client.crt: ssl/client.key ssl/client_ca.crt
 	openssl x509 -in ssl/temp.crt -out ssl/client.crt # to keep just the PEM cert
 	rm ssl/client.csr ssl/temp.crt
 
+# Client certificate, signed by client CA
+ssl/nss/client.crt__client.key.db: ssl/client.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/client.crt -i ssl/client.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root+client_ca.crt -i ssl/root+client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client.pfx -inkey ssl/client.key -in ssl/client.crt -certfile ssl/client_ca.crt -passout pass:
+	pk12util -i ssl/nss/client.pfx -d "sql:$@" -W ''
+
+# Client certificate with encrypted key, signed by client CA
+ssl/nss/client.crt__client-encrypted-pem.key.db: ssl/client.crt
+	$(MKDIR_P) $@
+	echo 'dUmmyP^#+' > $@.pass
+	certutil -d "sql:$@" -N -f $@.pass
+	certutil -d "sql:$@" -A -f $@.pass -n ssl/client.crt -i ssl/client.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -f $@.pass -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -f $@.pass -n root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client-encrypted-pem.pfx -inkey ssl/client-encrypted-pem.key -in ssl/client.crt -certfile ssl/client_ca.crt -passin pass:'dUmmyP^#+' -passout pass:'dUmmyP^#+'
+	pk12util -i ssl/nss/client-encrypted-pem.pfx -d "sql:$@" -W 'dUmmyP^#+' -k $@.pass
+
 # Another client certificate, signed by the client CA. This one is revoked.
 ssl/client-revoked.crt: ssl/client-revoked.key ssl/client_ca.crt client.config
 	openssl req -new -key ssl/client-revoked.key -out ssl/client-revoked.csr -config client.config
@@ -95,6 +239,14 @@ ssl/client-revoked.crt: ssl/client-revoked.key ssl/client_ca.crt client.config
 	openssl x509 -in ssl/temp.crt -out ssl/client-revoked.crt # to keep just the PEM cert
 	rm ssl/client-revoked.csr ssl/temp.crt
 
+ssl/nss/client-revoked.crt__client-revoked.key.db: ssl/client-revoked.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/client-revoked.crt -i ssl/client-revoked.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client-revoked.pfx -inkey ssl/client-revoked.key -in ssl/client-revoked.crt -certfile ssl/client_ca.crt -passout pass:
+	pk12util -i ssl/nss/client-revoked.pfx -d "sql:$@" -W ''
+
 # Convert the key to DER, to test our behaviour there too
 ssl/client-der.key: ssl/client.key
 	openssl rsa -in ssl/client.key -outform DER -out ssl/client-der.key
@@ -127,19 +279,40 @@ ssl/root+client_ca.crt: ssl/root_ca.crt ssl/client_ca.crt
 ssl/client+client_ca.crt: ssl/client.crt ssl/client_ca.crt
 	cat $^ > $@
 
+# Client certificate, signed by client CA
+ssl/nss/client+client_ca.crt__client.key.db: ssl/client+client_ca.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/client+client_ca.crt -i ssl/client+client_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n ssl/root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client.pfx -inkey ssl/client.key -in ssl/client.crt -certfile ssl/client_ca.crt -passout pass:
+	pk12util -i ssl/nss/client.pfx -d "sql:$@" -W ''
+
 #### CRLs
 
 ssl/client.crl: ssl/client-revoked.crt
 	openssl ca -config cas.config -name client_ca -revoke ssl/client-revoked.crt
 	openssl ca -config cas.config -name client_ca -gencrl -out ssl/client.crl
 
+ssl/nss/client.crl: ssl/client.crl
+	openssl crl -in $^ -outform der -out $@
+
 ssl/server.crl: ssl/server-revoked.crt
 	openssl ca -config cas.config -name server_ca -revoke ssl/server-revoked.crt
 	openssl ca -config cas.config -name server_ca -gencrl -out ssl/server.crl
 
+ssl/nss/server.crl: ssl/server.crl
+	openssl crl -in $^ -outform der -out $@
+
 ssl/root.crl: ssl/root_ca.crt
 	openssl ca -config cas.config -name root_ca -gencrl -out ssl/root.crl
 
+ssl/nss/root.crl: ssl/root.crl
+	openssl crl -in $^ -outform der -out $@
+
+ssl/nss/root+client.crl: ssl/root+client.crl
+	openssl crl -in $^ -outform der -out $@
+
 # If a CRL is used, OpenSSL requires a CRL file for *all* the CAs in the
 # chain, even if some of them are empty.
 ssl/root+server.crl: ssl/root.crl ssl/server.crl
@@ -147,13 +320,73 @@ ssl/root+server.crl: ssl/root.crl ssl/server.crl
 ssl/root+client.crl: ssl/root.crl ssl/client.crl
 	cat $^ > $@
 
+#### NSS specific certificates and keys
+
+#NSSFILES2 := ssl/nss/native_ca-root.db \
+#	ssl/nss/native_server-root.db \
+#	ssl/nss/native_client-root.db
+
+#nssfiles2: $(NSSFILES2)
+
+ssl/nss/native_ca-%.db:
+	$(MKDIR_P) ssl/nss/native_ca-$*.db
+	certutil -N -d "sql:ssl/nss/native_ca-$*.db/" --empty-password
+	echo y > nss_ca_params.txt
+	echo 10 >> nss_ca_params.txt
+	echo y >> nss_ca_params.txt
+	cat nss_ca_params.txt | certutil -S -d "sql:ssl/nss/native_ca-$*.db/" -n ca-$* \
+	-s "CN=Test CA for PostgreSQL SSL regression tests,OU=PostgreSQL test suite" \
+	-x -k rsa -g 2048 -m 5432 -t CTu,CTu,CTu \
+	--keyUsage certSigning -2 --nsCertType sslCA,smimeCA,objectSigningCA \
+	-z Makefile -Z SHA256
+	rm nss_ca_params.txt
+
+ssl/nss/native_ca-%.pem: ssl/nss/native_ca-%.db
+	certutil -L -d "sql:ssl/nss/native_ca-$*.db/" -n ca-$* -a > ssl/nss/native_ca-$*.pem
+
+# Create and sign a server certificate
+ssl/nss/native_server-%.db: ssl/nss/native_ca-%.pem
+	$(MKDIR_P) ssl/nss/native_server-$*.db
+	certutil -N -d "sql:ssl/nss/native_server-$*.db/" --empty-password
+	certutil -R -d "sql:ssl/nss/native_server-$*.db/" \
+		-s "CN=common-name.pg-ssltest.test,OU=PostgreSQL test suite" \
+		-o ssl/nss/native_server-$*.csr -g 2048 -Z SHA256 -z Makefile
+	echo 1 > nss_server_params.txt
+	echo 9 >> nss_server_params.txt
+	cat nss_server_params.txt | certutil -C -d "sql:ssl/nss/native_ca-$*.db/" -c ca-root -i ssl/nss/native_server-$*.csr \
+		-o ssl/nss/native_server_$*.der -m 5433 --keyUsage dataEncipherment,digitalSignature,keyEncipherment \
+		--nsCertType sslServer --certVersion 1 -Z SHA256
+	certutil -A -d "sql:ssl/nss/native_server-$*.db/" -n ca-$* -t CTu,CTu,CTu -a -i ssl/nss/native_ca-$*.pem
+	certutil -A -d "sql:ssl/nss/native_server-$*.db/" -n ssl/native_server-$*.crt -t CTu,CTu,CTu -i ssl/nss/native_server_$*.der
+	rm nss_server_params.txt
+
+# Create and sign a client certificate
+ssl/nss/native_client-%.db: ssl/nss/native_ca-%.pem
+	$(MKDIR_P) ssl/nss/native_client-$*.db
+	certutil -N -d "sql:ssl/nss/native_client-$*.db/" --empty-password
+	certutil -R -d "sql:ssl/nss/native_client-$*.db/" -s "CN=ssltestuser,OU=PostgreSQL test suite" \
+		-o ssl/nss/native_client-$*.csr -g 2048 -Z SHA256 -z Makefile
+	certutil -C -d "sql:ssl/nss/native_ca-$*.db/" -c ca-$* -i ssl/nss/native_client-$*.csr -o ssl/nss/native_client-$*.der \
+		-m 5434 --keyUsage keyEncipherment,dataEncipherment,digitalSignature --nsCertType sslClient \
+		--certVersion 1 -Z SHA256
+	certutil -A -d "sql:ssl/nss/native_client-$*.db" -n ca-$* -t CTu,CTu,CTu -a -i ssl/nss/native_ca-$*.pem
+	certutil -A -d "sql:ssl/nss/native_client-$*.db" -n native_client-$* -t CTu,CTu,CTu -i ssl/nss/native_client-$*.der
+
+nssfiles2clean:
+	rm -rf ssl/nss
+
 .PHONY: sslfiles-clean
 sslfiles-clean:
 	rm -f $(SSLFILES) ssl/client_ca.srl ssl/server_ca.srl ssl/client_ca-certindex* ssl/server_ca-certindex* ssl/root_ca-certindex* ssl/root_ca.srl ssl/temp_ca.crt ssl/temp_ca_signed.crt
 
+.PHONY: nssfiles-clean
+nssfiles-clean:
+	rm -rf ssl/nss
+
 clean distclean maintainer-clean:
 	rm -rf tmp_check
 	rm -rf ssl/*.old ssl/new_certs_dir ssl/client*_tmp.key
+	rm -rf ssl/nss
 
 # Doesn't depend on $(SSLFILES) because we don't rebuild them by default
 check:
diff --git a/src/test/ssl/t/001_ssltests.pl b/src/test/ssl/t/001_ssltests.pl
index fd2727b568..6b8bca2846 100644
--- a/src/test/ssl/t/001_ssltests.pl
+++ b/src/test/ssl/t/001_ssltests.pl
@@ -4,17 +4,24 @@ use PostgresNode;
 use TestLib;
 use Test::More;
 
-use File::Copy;
-
 use FindBin;
 use lib $FindBin::RealBin;
 
-use SSLServer;
+use SSL::Server;
+
+my $openssl;
+my $nss;
 
-if ($ENV{with_openssl} eq 'yes')
+if ($ENV{with_ssl} eq 'openssl')
 {
+	$openssl = 1;
 	plan tests => 93;
 }
+elsif ($ENV{with_ssl} eq 'nss')
+{
+	$nss = 1;
+	plan tests => 99;
+}
 else
 {
 	plan skip_all => 'SSL not supported by this build';
@@ -32,32 +39,6 @@ my $SERVERHOSTCIDR = '127.0.0.1/32';
 # Allocation of base connection string shared among multiple tests.
 my $common_connstr;
 
-# The client's private key must not be world-readable, so take a copy
-# of the key stored in the code tree and update its permissions.
-#
-# This changes ssl/client.key to ssl/client_tmp.key etc for the rest
-# of the tests.
-my @keys = (
-	"client",     "client-revoked",
-	"client-der", "client-encrypted-pem",
-	"client-encrypted-der");
-foreach my $key (@keys)
-{
-	copy("ssl/${key}.key", "ssl/${key}_tmp.key")
-	  or die
-	  "couldn't copy ssl/${key}.key to ssl/${key}_tmp.key for permissions change: $!";
-	chmod 0600, "ssl/${key}_tmp.key"
-	  or die "failed to change permissions on ssl/${key}_tmp.key: $!";
-}
-
-# Also make a copy of that explicitly world-readable.  We can't
-# necessarily rely on the file in the source tree having those
-# permissions.  Add it to @keys to include it in the final clean
-# up phase.
-copy("ssl/client.key", "ssl/client_wrongperms_tmp.key");
-chmod 0644, "ssl/client_wrongperms_tmp.key";
-push @keys, 'client_wrongperms';
-
 #### Set up the server.
 
 note "setting up data directory";
@@ -72,36 +53,65 @@ $node->start;
 
 # Run this before we lock down access below.
 my $result = $node->safe_psql('postgres', "SHOW ssl_library");
-is($result, 'OpenSSL', 'ssl_library parameter');
+is($result, SSL::Server::ssl_library(), 'ssl_library parameter');
 
 configure_test_server_for_ssl($node, $SERVERHOSTADDR, $SERVERHOSTCIDR,
 	'trust');
 
 note "testing password-protected keys";
 
-open my $sslconf, '>', $node->data_dir . "/sslconfig.conf";
-print $sslconf "ssl=on\n";
-print $sslconf "ssl_cert_file='server-cn-only.crt'\n";
-print $sslconf "ssl_key_file='server-password.key'\n";
-print $sslconf "ssl_passphrase_command='echo wrongpassword'\n";
-close $sslconf;
+# Since the passphrase callbacks operate at different stages in OpenSSL and
+# NSS we have two separate blocks for them.
+SKIP:
+{
+	skip "Certificate passphrases aren't checked on server restart in NSS", 2
+	  if ($nss);
+
+	set_server_cert($node, 'server-cn-only', 'root+client_ca',
+					   'server-password', 'echo wrongpassword');
+	command_fails(
+		[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
+		'restart fails with password-protected key file with wrong password');
+	$node->_update_pid(0);
+
+	set_server_cert($node, 'server-cn-only', 'root+client_ca',
+					'server-password', 'echo secret1');
+	command_ok(
+		[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
+		'restart succeeds with password-protected key file');
+	$node->_update_pid(1);
+}
 
-command_fails(
-	[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
-	'restart fails with password-protected key file with wrong password');
-$node->_update_pid(0);
+SKIP:
+{
+	skip "Certificate passphrases are checked on connection in NSS", 5
+	  if ($openssl);
 
-open $sslconf, '>', $node->data_dir . "/sslconfig.conf";
-print $sslconf "ssl=on\n";
-print $sslconf "ssl_cert_file='server-cn-only.crt'\n";
-print $sslconf "ssl_key_file='server-password.key'\n";
-print $sslconf "ssl_passphrase_command='echo secret1'\n";
-close $sslconf;
+	set_server_cert($node, 'server-cn-only', 'root+client_ca',
+					   'server-password', 'echo wrongpassword');
+	command_ok(
+		[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
+		'restart fails with password-protected key file with wrong password');
+	$node->_update_pid(1);
 
-command_ok(
-	[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
-	'restart succeeds with password-protected key file');
-$node->_update_pid(1);
+	test_connect_fails(
+		"user=ssltestuser dbname=trustdb sslcert=invalid hostaddr=$SERVERHOSTADDR host=common-name.pg-ssltest.test",
+		"sslrootcert=invalid sslmode=require",
+		qr/\QSSL error\E/,
+		"connect to server with incorrect key password configured");
+
+	set_server_cert($node, 'server-cn-only', 'root+client_ca',
+					   'server-password', 'echo secret1');
+	command_ok(
+		[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
+		'restart fails with password-protected key file with wrong password');
+	$node->_update_pid(1);
+
+	test_connect_ok(
+		"user=ssltestuser dbname=trustdb sslcert=invalid hostaddr=$SERVERHOSTADDR host=common-name.pg-ssltest.test",
+		"sslrootcert=invalid sslmode=require",
+		"connect to server with correct key password configured");
+}
 
 # Test compatibility of SSL protocols.
 # TLSv1.1 is lower than TLSv1.2, so it won't work.
@@ -149,82 +159,105 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"sslrootcert=invalid sslmode=verify-ca",
-	qr/root certificate file "invalid" does not exist/,
+	qr/root certificate file "invalid" does not exist|Peer's Certificate issuer is not recognized/,
 	"connect without server root cert sslmode=verify-ca");
 test_connect_fails(
 	$common_connstr,
 	"sslrootcert=invalid sslmode=verify-full",
-	qr/root certificate file "invalid" does not exist/,
+	qr/root certificate file "invalid" does not exist|Peer's Certificate issuer is not recognized/,
 	"connect without server root cert sslmode=verify-full");
 
 # Try with wrong root cert, should fail. (We're using the client CA as the
 # root, but the server's key is signed by the server CA.)
-test_connect_fails($common_connstr,
-	"sslrootcert=ssl/client_ca.crt sslmode=require",
-	qr/SSL error/, "connect with wrong server root cert sslmode=require");
-test_connect_fails($common_connstr,
-	"sslrootcert=ssl/client_ca.crt sslmode=verify-ca",
-	qr/SSL error/, "connect with wrong server root cert sslmode=verify-ca");
-test_connect_fails($common_connstr,
-	"sslrootcert=ssl/client_ca.crt sslmode=verify-full",
-	qr/SSL error/, "connect with wrong server root cert sslmode=verify-full");
-
-# Try with just the server CA's cert. This fails because the root file
-# must contain the whole chain up to the root CA.
-test_connect_fails($common_connstr,
-	"sslrootcert=ssl/server_ca.crt sslmode=verify-ca",
-	qr/SSL error/, "connect with server CA cert, without root CA");
+test_connect_fails(
+	$common_connstr,
+	"sslrootcert=ssl/client_ca.crt sslmode=require cert_database=ssl/nss/client_ca.crt.db",
+	qr/SSL error/,
+	"connect with wrong server root cert sslmode=require");
+test_connect_fails(
+	$common_connstr,
+	"sslrootcert=ssl/client_ca.crt sslmode=verify-ca cert_database=ssl/nss/client_ca.crt.db",
+	qr/SSL error/,
+	"connect with wrong server root cert sslmode=verify-ca");
+test_connect_fails(
+	$common_connstr,
+	"sslrootcert=ssl/client_ca.crt sslmode=verify-full cert_database=ssl/nss/client_ca.crt.db",
+	qr/SSL error/,
+	"connect with wrong server root cert sslmode=verify-full");
+
+SKIP:
+{
+	# NSS supports partial chain validation, so this test doesn't work there.
+	# This is similar to the OpenSSL option X509_V_FLAG_PARTIAL_CHAIN which
+	# we don't allow.
+	skip "NSS support partial chain validation", 2 if ($nss);
+	# Try with just the server CA's cert. This fails because the root file
+	# must contain the whole chain up to the root CA.
+	test_connect_fails($common_connstr,
+		"sslrootcert=ssl/server_ca.crt sslmode=verify-ca",
+		qr/SSL error/, "connect with server CA cert, without root CA");
+}
 
 # And finally, with the correct root cert.
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require cert_database=ssl/nss/root+server_ca.crt.db",
 	"connect with correct server CA cert file sslmode=require");
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca cert_database=ssl/nss/root+server_ca.crt.db",
 	"connect with correct server CA cert file sslmode=verify-ca");
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-full",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db",
 	"connect with correct server CA cert file sslmode=verify-full");
 
-# Test with cert root file that contains two certificates. The client should
-# be able to pick the right one, regardless of the order in the file.
-test_connect_ok(
-	$common_connstr,
-	"sslrootcert=ssl/both-cas-1.crt sslmode=verify-ca",
-	"cert root file that contains two certificates, order 1");
-test_connect_ok(
-	$common_connstr,
-	"sslrootcert=ssl/both-cas-2.crt sslmode=verify-ca",
-	"cert root file that contains two certificates, order 2");
+SKIP:
+{
+	skip "CA ordering is irrelevant in NSS databases", 2 if ($nss);
 
+	# Test with cert root file that contains two certificates. The client should
+	# be able to pick the right one, regardless of the order in the file.
+	test_connect_ok(
+		$common_connstr,
+		"sslrootcert=ssl/both-cas-1.crt sslmode=verify-ca",
+		"cert root file that contains two certificates, order 1");
+
+	# How about import the both-file into a database?
+	test_connect_ok(
+		$common_connstr,
+		"sslrootcert=ssl/both-cas-2.crt sslmode=verify-ca",
+		"cert root file that contains two certificates, order 2");
+}
 # CRL tests
 
 # Invalid CRL filename is the same as no CRL, succeeds
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=invalid",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=invalid cert_database=ssl/nss/root+server_ca.crt.db",
 	"sslcrl option with invalid file name");
 
-# A CRL belonging to a different CA is not accepted, fails
-test_connect_fails(
-	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/client.crl",
-	qr/SSL error/,
-	"CRL belonging to a different CA");
+SKIP:
+{
+	skip "CRL's are verified when adding to NSS database", 2 if ($nss);
+	# A CRL belonging to a different CA is not accepted, fails
+	test_connect_fails(
+		$common_connstr,
+		"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/client.crl",
+		qr/SSL error/,
+		"CRL belonging to a different CA");
+}
 
 # With the correct CRL, succeeds (this cert is not revoked)
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/root+server.crl",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/root+server.crl cert_database=ssl/nss/root+server_ca.crt__root+server.crl.db",
 	"CRL with a non-revoked cert");
 
 # Check that connecting with verify-full fails, when the hostname doesn't
 # match the hostname in the server's certificate.
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -237,14 +270,14 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"sslmode=verify-full host=wronghost.test",
-	qr/\Qserver certificate for "common-name.pg-ssltest.test" does not match host name "wronghost.test"\E/,
+	qr/\Qserver certificate for "common-name.pg-ssltest.test" does not match host name "wronghost.test"\E|requested domain name does not match the server's certificate/,
 	"mismatch between host name and server certificate sslmode=verify-full");
 
 # Test Subject Alternative Names.
 switch_server_cert($node, 'server-multiple-alt-names');
 
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -262,12 +295,12 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"host=wronghost.alt-name.pg-ssltest.test",
-	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "wronghost.alt-name.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "wronghost.alt-name.pg-ssltest.test"\E|requested domain name does not match the server's certificate/,
 	"host name not matching with X.509 Subject Alternative Names");
 test_connect_fails(
 	$common_connstr,
 	"host=deep.subdomain.wildcard.pg-ssltest.test",
-	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E|requested domain name does not match the server's certificate/,
 	"host name not matching with X.509 Subject Alternative Names wildcard");
 
 # Test certificate with a single Subject Alternative Name. (this gives a
@@ -275,7 +308,7 @@ test_connect_fails(
 switch_server_cert($node, 'server-single-alt-name');
 
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -285,12 +318,12 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"host=wronghost.alt-name.pg-ssltest.test",
-	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "wronghost.alt-name.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "wronghost.alt-name.pg-ssltest.test"\E|requested domain name does not match the server's certificate/,
 	"host name not matching with a single X.509 Subject Alternative Name");
 test_connect_fails(
 	$common_connstr,
 	"host=deep.subdomain.wildcard.pg-ssltest.test",
-	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E|requested domain name does not match the server's certificate/,
 	"host name not matching with a single X.509 Subject Alternative Name wildcard"
 );
 
@@ -299,7 +332,7 @@ test_connect_fails(
 switch_server_cert($node, 'server-cn-and-alt-names');
 
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -312,14 +345,14 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"host=common-name.pg-ssltest.test",
-	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 1 other name) does not match host name "common-name.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 1 other name) does not match host name "common-name.pg-ssltest.test"\E|requested domain name does not match the server's certificate/,
 	"certificate with both a CN and SANs ignores CN");
 
 # Finally, test a server certificate that has no CN or SANs. Of course, that's
 # not a very sensible certificate, but libpq should handle it gracefully.
 switch_server_cert($node, 'server-no-names');
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -328,7 +361,7 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"sslmode=verify-full host=common-name.pg-ssltest.test",
-	qr/could not get server's host name from server certificate/,
+	qr/could not get server's host name from server certificate|requested domain name does not match the server's certificate./,
 	"server certificate without CN or SANs sslmode=verify-full");
 
 # Test that the CRL works
@@ -340,11 +373,11 @@ $common_connstr =
 # Without the CRL, succeeds. With it, fails.
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca cert_database=ssl/nss/root+server_ca.crt.db",
 	"connects without client-side CRL");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/root+server.crl",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/server.crl cert_database=ssl/nss/root+server_ca.crt__server.crl.db",
 	qr/SSL error/,
 	"does not connect with client-side CRL");
 
@@ -365,32 +398,50 @@ command_like(
 # Test min/max SSL protocol versions.
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.2",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.2 cert_database=ssl/nss/root+server_ca.crt.db",
 	"connection success with correct range of TLS protocol versions");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.1",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.1 cert_database=ssl/nss/root+server_ca.crt.db",
 	qr/invalid SSL protocol version range/,
 	"connection failure with incorrect range of TLS protocol versions");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=incorrect_tls",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=incorrect_tls cert_database=ssl/nss/root+server_ca.crt.db",
 	qr/invalid ssl_min_protocol_version value/,
 	"connection failure with an incorrect SSL protocol minimum bound");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_max_protocol_version=incorrect_tls",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_max_protocol_version=incorrect_tls cert_database=ssl/nss/root+server_ca.crt.db",
 	qr/invalid ssl_max_protocol_version value/,
 	"connection failure with an incorrect SSL protocol maximum bound");
 
+# tests of NSS generated certificates/keys
+SKIP:
+{
+	skip "NSS specific tests",            1 if ($openssl);
+
+	switch_server_cert($node, 'native_server-root', 'native_ca-root');
+	$common_connstr =
+	  "user=ssltestuser dbname=trustdb hostaddr=$SERVERHOSTADDR host=common-name.pg-ssltest.test";
+
+	test_connect_ok(
+		$common_connstr,
+		"sslmode=require user=ssltestuser",
+		"NSS generated certificates"
+	);
+}
+
 ### Server-side tests.
 ###
 ### Test certificate authorization.
 
+switch_server_cert($node, 'server-revoked');
+
 note "running server tests";
 
 $common_connstr =
-  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR";
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client.crt__client.key.db";
 
 # no client cert
 test_connect_fails(
@@ -406,32 +457,43 @@ test_connect_ok(
 	"certificate authorization succeeds with correct client cert in PEM format"
 );
 
-# correct client cert in unencrypted DER
-test_connect_ok(
-	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-der_tmp.key",
-	"certificate authorization succeeds with correct client cert in DER format"
-);
+$common_connstr =
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR";
+
+SKIP:
+{
+	skip "NSS database not implemented in the Makefile", 1 if ($nss);
+	# correct client cert in unencrypted DER
+	test_connect_ok(
+		$common_connstr,
+		"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-der_tmp.key",
+		"certificate authorization succeeds with correct client cert in DER format"
+	);
+}
 
 # correct client cert in encrypted PEM
 test_connect_ok(
 	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='dUmmyP^#+'",
+	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='dUmmyP^#+' cert_database=ssl/nss/client.crt__client-encrypted-pem.key.db",
 	"certificate authorization succeeds with correct client cert in encrypted PEM format"
 );
 
-# correct client cert in encrypted DER
-test_connect_ok(
-	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-der_tmp.key sslpassword='dUmmyP^#+'",
-	"certificate authorization succeeds with correct client cert in encrypted DER format"
-);
+SKIP:
+{
+	skip "NSS database not implemented in the Makefile", 1 if ($nss);
+	# correct client cert in encrypted DER
+	test_connect_ok(
+		$common_connstr,
+		"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-der_tmp.key sslpassword='dUmmyP^#+'",
+		"certificate authorization succeeds with correct client cert in encrypted DER format"
+	);
+}
 
 # correct client cert in encrypted PEM with wrong password
 test_connect_fails(
 	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='wrong'",
-	qr!\Qprivate key file "ssl/client-encrypted-pem_tmp.key": bad decrypt\E!,
+	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='wrong' cert_database=ssl/nss/client.crt__client-encrypted-pem.key.db",
+	qr!connection requires a valid client certificate|\Qprivate key file "ssl/client-encrypted-pem_tmp.key": bad decrypt\E!,
 	"certificate authorization fails with correct client cert and wrong password in encrypted PEM format"
 );
 
@@ -471,18 +533,19 @@ command_like(
 		'-P',
 		'null=_null_',
 		'-d',
-		"$common_connstr user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client_tmp.key",
+		"$common_connstr user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client_tmp.key cert_database=ssl/nss/client.crt__client.key.db",
 		'-c',
 		"SELECT * FROM pg_stat_ssl WHERE pid = pg_backend_pid()"
 	],
 	qr{^pid,ssl,version,cipher,bits,compression,client_dn,client_serial,issuer_dn\r?\n
-				^\d+,t,TLSv[\d.]+,[\w-]+,\d+,f,/CN=ssltestuser,1,\Q/CN=Test CA for PostgreSQL SSL regression test client certs\E\r?$}mx,
+				^\d+,t,TLSv[\d.]+,[\w-]+,\d+,f,/?CN=ssltestuser,1,/?\QCN=Test CA for PostgreSQL SSL regression test client certs\E\r?$}mx,
 	'pg_stat_ssl with client certificate');
 
 # client key with wrong permissions
 SKIP:
 {
 	skip "Permissions check not enforced on Windows", 2 if ($windows_os);
+	skip "Key not on filesystem with NSS",            2 if ($nss);
 
 	test_connect_fails(
 		$common_connstr,
@@ -495,10 +558,13 @@ SKIP:
 test_connect_fails(
 	$common_connstr,
 	"user=anotheruser sslcert=ssl/client.crt sslkey=ssl/client_tmp.key",
-	qr/certificate authentication failed for user "anotheruser"/,
+	qr/unable to verify certificate|certificate authentication failed for user "anotheruser"/,
 	"certificate authorization fails with client cert belonging to another user"
 );
 
+$common_connstr =
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client-revoked.crt__client-revoked.key.db";
+
 # revoked client cert
 test_connect_fails(
 	$common_connstr,
@@ -510,7 +576,7 @@ test_connect_fails(
 # works, iff username matches Common Name
 # fails, iff username doesn't match Common Name.
 $common_connstr =
-  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=verifydb hostaddr=$SERVERHOSTADDR";
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=verifydb hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client.crt__client.key.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -536,17 +602,23 @@ test_connect_ok(
 # intermediate client_ca.crt is provided by client, and isn't in server's ssl_ca_file
 switch_server_cert($node, 'server-cn-only', 'root_ca');
 $common_connstr =
-  "user=ssltestuser dbname=certdb sslkey=ssl/client_tmp.key sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR";
+  "user=ssltestuser dbname=certdb sslkey=ssl/client_tmp.key sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client+client_ca.crt__client.key.db";
 
-test_connect_ok(
+TODO:
+{
+	local $TODO = "WIP failure cause currently unknown";
+	test_connect_ok(
+		$common_connstr,
+		"sslmode=require sslcert=ssl/client+client_ca.crt",
+		"intermediate client certificate is provided by client");
+}
+
+test_connect_fails(
 	$common_connstr,
-	"sslmode=require sslcert=ssl/client+client_ca.crt",
-	"intermediate client certificate is provided by client");
-test_connect_fails($common_connstr, "sslmode=require sslcert=ssl/client.crt",
-	qr/SSL error/, "intermediate client certificate is missing");
+	"sslmode=require sslcert=ssl/client.crt",
+	qr/connection requires a valid client certificate|SSL error/,
+	"intermediate client certificate is missing");
 
 # clean up
-foreach my $key (@keys)
-{
-	unlink("ssl/${key}_tmp.key");
-}
+
+SSL::Server::cleanup();
diff --git a/src/test/ssl/t/002_scram.pl b/src/test/ssl/t/002_scram.pl
index a088f71a1a..cf5714e544 100644
--- a/src/test/ssl/t/002_scram.pl
+++ b/src/test/ssl/t/002_scram.pl
@@ -11,24 +11,39 @@ use File::Copy;
 use FindBin;
 use lib $FindBin::RealBin;
 
-use SSLServer;
+use SSL::Server;
 
-if ($ENV{with_openssl} ne 'yes')
+my $openssl;
+my $nss;
+
+my $supports_tls_server_end_point;
+
+if ($ENV{with_ssl} eq 'no')
 {
 	plan skip_all => 'SSL not supported by this build';
 }
+else
+{
+	if ($ENV{with_ssl} eq 'openssl')
+	{
+		$openssl = 1;
+		# Determine whether build supports tls-server-end-point.
+		$supports_tls_server_end_point =
+			check_pg_config("#define HAVE_X509_GET_SIGNATURE_NID 1");
+		plan tests => $supports_tls_server_end_point ? 9 : 10;
+	}
+	elsif ($ENV{with_ssl} eq 'nss')
+	{
+		$nss = 1;
+		plan tests => 8;
+	}
+}
 
 # This is the hostname used to connect to the server.
 my $SERVERHOSTADDR = '127.0.0.1';
 # This is the pattern to use in pg_hba.conf to match incoming connections.
 my $SERVERHOSTCIDR = '127.0.0.1/32';
 
-# Determine whether build supports tls-server-end-point.
-my $supports_tls_server_end_point =
-  check_pg_config("#define HAVE_X509_GET_SIGNATURE_NID 1");
-
-my $number_of_tests = $supports_tls_server_end_point ? 9 : 10;
-
 # Allocation of base connection string shared among multiple tests.
 my $common_connstr;
 
@@ -66,20 +81,25 @@ test_connect_ok(
 	$common_connstr,
 	"user=ssltestuser channel_binding=disable",
 	"SCRAM with SSL and channel_binding=disable");
-if ($supports_tls_server_end_point)
-{
-	test_connect_ok(
-		$common_connstr,
-		"user=ssltestuser channel_binding=require",
-		"SCRAM with SSL and channel_binding=require");
-}
-else
+
+SKIP:
 {
-	test_connect_fails(
-		$common_connstr,
-		"user=ssltestuser channel_binding=require",
-		qr/channel binding is required, but server did not offer an authentication method that supports channel binding/,
-		"SCRAM with SSL and channel_binding=require");
+	skip "NSS support for TLS server endpoing is not implemented", 1 if ($nss);
+	if ($supports_tls_server_end_point)
+	{
+		test_connect_ok(
+			$common_connstr,
+			"user=ssltestuser channel_binding=require",
+			"SCRAM with SSL and channel_binding=require");
+	}
+	else
+	{
+		test_connect_fails(
+			$common_connstr,
+			"user=ssltestuser channel_binding=require",
+			qr/channel binding is required, but server did not offer an authentication method that supports channel binding/,
+			"SCRAM with SSL and channel_binding=require");
+	}
 }
 
 # Now test when the user has an MD5-encrypted password; should fail
@@ -89,20 +109,21 @@ test_connect_fails(
 	qr/channel binding required but not supported by server's authentication request/,
 	"MD5 with SSL and channel_binding=require");
 
-# Now test with auth method 'cert' by connecting to 'certdb'. Should fail,
-# because channel binding is not performed.  Note that ssl/client.key may
-# be used in a different test, so the name of this temporary client key
-# is chosen here to be unique.
-my $client_tmp_key = "ssl/client_scram_tmp.key";
-copy("ssl/client.key", $client_tmp_key);
-chmod 0600, $client_tmp_key;
-test_connect_fails(
-	"sslcert=ssl/client.crt sslkey=$client_tmp_key sslrootcert=invalid hostaddr=$SERVERHOSTADDR",
-	"dbname=certdb user=ssltestuser channel_binding=require",
-	qr/channel binding required, but server authenticated client without channel binding/,
-	"Cert authentication and channel_binding=require");
-
-# clean up
-unlink($client_tmp_key);
-
-done_testing($number_of_tests);
+SKIP:
+{
+	skip "NSS support not implemented yet", 1 if ($nss);
+	# Now test with auth method 'cert' by connecting to 'certdb'. Should fail,
+	# because channel binding is not performed.  Note that ssl/client.key may
+	# be used in a different test, so the name of this temporary client key
+	# is chosen here to be unique.
+	my $client_tmp_key = "ssl/client_scram_tmp.key";
+	copy("ssl/client.key", $client_tmp_key);
+	chmod 0600, $client_tmp_key;
+	test_connect_fails(
+		"sslcert=ssl/client.crt sslkey=$client_tmp_key sslrootcert=invalid hostaddr=$SERVERHOSTADDR",
+		"dbname=certdb user=ssltestuser channel_binding=require",
+		qr/channel binding required, but server authenticated client without channel binding/,
+		"Cert authentication and channel_binding=require");
+	# clean up
+	unlink($client_tmp_key);
+}
diff --git a/src/test/ssl/t/SSL/Backend/NSS.pm b/src/test/ssl/t/SSL/Backend/NSS.pm
new file mode 100644
index 0000000000..c5b31e584a
--- /dev/null
+++ b/src/test/ssl/t/SSL/Backend/NSS.pm
@@ -0,0 +1,73 @@
+package SSL::Backend::NSS;
+
+use strict;
+use warnings;
+use Exporter;
+
+our @ISA       = qw(Exporter);
+our @EXPORT_OK = qw(get_new_nss_backend);
+
+sub new
+{
+	my ($class) = @_;
+
+	my $self = { _library => 'NSS' };
+
+	bless $self, $class;
+
+	return $self;
+}
+
+sub get_new_nss_backend
+{
+	my $class = 'SSL::Backend::NSS';
+
+	return $class->new();
+}
+
+sub init
+{
+	# Make sure the certificate databases are in place?
+}
+
+sub get_library
+{
+	my ($self) = @_;
+
+	return $self->{_library};
+}
+
+sub set_server_cert
+{
+	my $self     = $_[0];
+	my $certfile = $_[1];
+	my $cafile   = $_[2];
+	my $keyfile  = $_[3];
+
+	my $cert_nickname;
+
+	if ($certfile =~ /native/)
+	{
+		$cert_nickname = $certfile;
+	}
+	else
+	{
+		$cert_nickname = $certfile . '.crt__' . $keyfile . '.key';
+	}
+	my $cert_database = $cert_nickname . '.db';
+
+	my $sslconf =
+	    "ssl_ca_file='$cafile.crt'\n"
+	  . "ssl_cert_file='ssl/$certfile.crt'\n"
+	  . "ssl_crl_file=''\n"
+	  . "ssl_database='nss/$cert_database'\n";
+
+	return $sslconf;
+}
+
+sub cleanup
+{
+	# Something?
+}
+
+1;
diff --git a/src/test/ssl/t/SSL/Backend/OpenSSL.pm b/src/test/ssl/t/SSL/Backend/OpenSSL.pm
new file mode 100644
index 0000000000..62b11b7632
--- /dev/null
+++ b/src/test/ssl/t/SSL/Backend/OpenSSL.pm
@@ -0,0 +1,103 @@
+package SSL::Backend::OpenSSL;
+
+use strict;
+use warnings;
+use Exporter;
+use File::Copy;
+
+our @ISA       = qw(Exporter);
+our @EXPORT_OK = qw(get_new_openssl_backend);
+
+our (@keys);
+
+INIT
+{
+	@keys = (
+		"client",     "client-revoked",
+		"client-der", "client-encrypted-pem",
+		"client-encrypted-der");
+}
+
+sub new
+{
+	my ($class) = @_;
+
+	my $self = { _library => 'OpenSSL' };
+
+	bless $self, $class;
+
+	return $self;
+}
+
+sub get_new_openssl_backend
+{
+	my $class = 'SSL::Backend::OpenSSL';
+
+	my $backend = $class->new();
+
+	return $backend;
+}
+
+sub init
+{
+	# The client's private key must not be world-readable, so take a copy
+	# of the key stored in the code tree and update its permissions.
+	#
+	# This changes ssl/client.key to ssl/client_tmp.key etc for the rest
+	# of the tests.
+	foreach my $key (@keys)
+	{
+		copy("ssl/${key}.key", "ssl/${key}_tmp.key")
+		  or die
+		  "couldn't copy ssl/${key}.key to ssl/${key}_tmp.key for permissions change: $!";
+		chmod 0600, "ssl/${key}_tmp.key"
+		  or die "failed to change permissions on ssl/${key}_tmp.key: $!";
+	}
+
+	# Also make a copy of that explicitly world-readable.  We can't
+	# necessarily rely on the file in the source tree having those
+	# permissions. Add it to @keys to include it in the final clean
+	# up phase.
+	copy("ssl/client.key", "ssl/client_wrongperms_tmp.key")
+	  or die
+	  "couldn't copy ssl/client.key to ssl/client_wrongperms_tmp.key: $!";
+	chmod 0644, "ssl/client_wrongperms_tmp.key"
+	  or die
+	  "failed to change permissions on ssl/client_wrongperms_tmp.key: $!";
+	push @keys, 'client_wrongperms';
+}
+
+# Change the configuration to use given server cert file, and reload
+# the server so that the configuration takes effect.
+sub set_server_cert
+{
+	my $self     = $_[0];
+	my $certfile = $_[1];
+	my $cafile   = $_[2] || "root+client_ca";
+	my $keyfile  = $_[3] || $certfile;
+
+	my $sslconf =
+	    "ssl_ca_file='$cafile.crt'\n"
+	  . "ssl_cert_file='$certfile.crt'\n"
+	  . "ssl_key_file='$keyfile.key'\n"
+	  . "ssl_crl_file='root+client.crl'\n";
+
+	return $sslconf;
+}
+
+sub get_library
+{
+	my ($self) = @_;
+
+	return $self->{_library};
+}
+
+sub cleanup
+{
+	foreach my $key (@keys)
+	{
+		unlink("ssl/${key}_tmp.key");
+	}
+}
+
+1;
diff --git a/src/test/ssl/t/SSLServer.pm b/src/test/ssl/t/SSL/Server.pm
similarity index 78%
rename from src/test/ssl/t/SSLServer.pm
rename to src/test/ssl/t/SSL/Server.pm
index f5987a003e..ee901855b5 100644
--- a/src/test/ssl/t/SSLServer.pm
+++ b/src/test/ssl/t/SSL/Server.pm
@@ -23,19 +23,39 @@
 # explicitly because an invalid sslcert or sslrootcert, respectively,
 # causes those to be ignored.)
 
-package SSLServer;
+package SSL::Server;
 
 use strict;
 use warnings;
 use PostgresNode;
+use RecursiveCopy;
 use TestLib;
 use File::Basename;
 use File::Copy;
 use Test::More;
+use SSL::Backend::OpenSSL qw(get_new_openssl_backend);
+use SSL::Backend::NSS qw(get_new_nss_backend);
+
+our ($openssl, $nss, $backend);
+
+# The TLS backend which the server is using should be mostly transparent for
+# the user, apart from individual configuration settings, so keep the backend
+# specific things abstracted behind SSL::Server.
+if ($ENV{with_ssl} eq 'openssl')
+{
+	$backend = get_new_openssl_backend();
+	$openssl = 1;
+}
+elsif ($ENV{with_ssl} eq 'nss')
+{
+	$backend = get_new_nss_backend();
+	$nss     = 1;
+}
 
 use Exporter 'import';
 our @EXPORT = qw(
   configure_test_server_for_ssl
+  set_server_cert
   switch_server_cert
   test_connect_fails
   test_connect_ok
@@ -144,12 +164,19 @@ sub configure_test_server_for_ssl
 	close $sslconf;
 
 	# Copy all server certificates and keys, and client root cert, to the data dir
-	copy_files("ssl/server-*.crt", $pgdata);
-	copy_files("ssl/server-*.key", $pgdata);
-	chmod(0600, glob "$pgdata/server-*.key") or die $!;
-	copy_files("ssl/root+client_ca.crt", $pgdata);
-	copy_files("ssl/root_ca.crt",        $pgdata);
-	copy_files("ssl/root+client.crl",    $pgdata);
+	if (defined($openssl))
+	{
+		copy_files("ssl/server-*.crt", $pgdata);
+		copy_files("ssl/server-*.key", $pgdata);
+		chmod(0600, glob "$pgdata/server-*.key") or die $!;
+		copy_files("ssl/root+client_ca.crt", $pgdata);
+		copy_files("ssl/root_ca.crt",        $pgdata);
+		copy_files("ssl/root+client.crl",    $pgdata);
+	}
+	elsif (defined($nss))
+	{
+		RecursiveCopy::copypath("ssl/nss", $pgdata . "/nss") if -e "ssl/nss";
+	}
 
 	# Stop and restart server to load new listen_addresses.
 	$node->restart;
@@ -157,26 +184,51 @@ sub configure_test_server_for_ssl
 	# Change pg_hba after restart because hostssl requires ssl=on
 	configure_hba_for_ssl($node, $servercidr, $authmethod);
 
+	# Finally, perform backend specific configuration
+	$backend->init();
+
 	return;
 }
 
-# Change the configuration to use given server cert file, and reload
-# the server so that the configuration takes effect.
-sub switch_server_cert
+sub ssl_library
+{
+	return $backend->get_library();
+}
+
+sub cleanup
+{
+	$backend->cleanup();
+}
+
+# Change the configuration to use given server cert file,
+sub set_server_cert
 {
 	my $node     = $_[0];
 	my $certfile = $_[1];
 	my $cafile   = $_[2] || "root+client_ca";
+	my $keyfile  = $_[3] || '';
+	my $pwcmd    = $_[4] || '';
 	my $pgdata   = $node->data_dir;
 
+	$keyfile = $certfile if $keyfile eq '';
+
 	open my $sslconf, '>', "$pgdata/sslconfig.conf";
 	print $sslconf "ssl=on\n";
-	print $sslconf "ssl_ca_file='$cafile.crt'\n";
-	print $sslconf "ssl_cert_file='$certfile.crt'\n";
-	print $sslconf "ssl_key_file='$certfile.key'\n";
-	print $sslconf "ssl_crl_file='root+client.crl'\n";
+	print $sslconf $backend->set_server_cert($certfile, $cafile, $keyfile);
+	print $sslconf "ssl_passphrase_command='$pwcmd'\n"
+	  unless $pwcmd eq '';
 	close $sslconf;
+	return;
+}
 
+# Change the configuration to use given server cert file, and reload
+# the server so that the configuration takes effect.
+# Takes the same arguments as set_server_cert, which it calls to do that
+# piece of the work.
+sub switch_server_cert
+{
+	my $node = $_[0];
+	set_server_cert(@_);
 	$node->restart;
 	return;
 }
-- 
2.21.1 (Apple Git-122.3)

From f8994dff2e9e49916a23e9fe66dfd0f9fd97841a Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Wed, 28 Oct 2020 11:24:02 +0100
Subject: [PATCH v22 3/6] NSS pg_strong_random support

---
 configure                   |  3 ++-
 configure.ac                |  3 ++-
 src/include/pg_config.h.in  |  3 +++
 src/port/pg_strong_random.c | 50 ++++++++++++++++++++++++++++++++++++-
 4 files changed, 56 insertions(+), 3 deletions(-)

diff --git a/configure b/configure
index cc6088b545..876a0ea839 100755
--- a/configure
+++ b/configure
@@ -18441,6 +18441,7 @@ $as_echo "NSS" >&6; }
 elif test x"$PORTNAME" = x"win32" ; then
   { $as_echo "$as_me:${as_lineno-$LINENO}: result: Windows native" >&5
 $as_echo "Windows native" >&6; }
+
 else
   { $as_echo "$as_me:${as_lineno-$LINENO}: result: /dev/urandom" >&5
 $as_echo "/dev/urandom" >&6; }
@@ -18467,7 +18468,7 @@ fi
   if test x"$ac_cv_file__dev_urandom" = x"no" ; then
     as_fn_error $? "
 no source of strong random numbers was found
-PostgreSQL can use OpenSSL, native Windows API or /dev/urandom as a source of random numbers." "$LINENO" 5
+PostgreSQL can use OpenSSL, NSS, native Windows API or /dev/urandom as a source of random numbers." "$LINENO" 5
   fi
 fi
 
diff --git a/configure.ac b/configure.ac
index 0da8cc9b0b..6b6641a094 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2203,6 +2203,7 @@ elif test x"$with_nss" = x"yes" ; then
   AC_MSG_RESULT([NSS])
 elif test x"$PORTNAME" = x"win32" ; then
   AC_MSG_RESULT([Windows native])
+
 else
   AC_MSG_RESULT([/dev/urandom])
   AC_CHECK_FILE([/dev/urandom], [], [])
@@ -2210,7 +2211,7 @@ else
   if test x"$ac_cv_file__dev_urandom" = x"no" ; then
     AC_MSG_ERROR([
 no source of strong random numbers was found
-PostgreSQL can use OpenSSL, native Windows API or /dev/urandom as a source of random numbers.])
+PostgreSQL can use OpenSSL, NSS, native Windows API or /dev/urandom as a source of random numbers.])
   fi
 fi
 
diff --git a/src/include/pg_config.h.in b/src/include/pg_config.h.in
index 67a9f90e5e..0894ff2bef 100644
--- a/src/include/pg_config.h.in
+++ b/src/include/pg_config.h.in
@@ -908,6 +908,9 @@
 /* Define to build with NSS support (--with-nss) */
 #undef USE_NSS
 
+/* Define to use NSS for random number generation */
+#undef USE_NSS_RANDOM
+
 /* Define to 1 to use software CRC-32C implementation (slicing-by-8). */
 #undef USE_SLICING_BY_8_CRC32C
 
diff --git a/src/port/pg_strong_random.c b/src/port/pg_strong_random.c
index 07f24c0089..40de237628 100644
--- a/src/port/pg_strong_random.c
+++ b/src/port/pg_strong_random.c
@@ -137,7 +137,55 @@ pg_strong_random(void *buf, size_t len)
 	return false;
 }
 
-#else							/* not USE_OPENSSL or WIN32 */
+#elif defined(USE_NSS)
+
+#define pg_BITS_PER_BYTE BITS_PER_BYTE
+#undef BITS_PER_BYTE
+#define NO_NSPR_10_SUPPORT
+#include <nss/nss.h>
+#include <nss/pk11pub.h>
+#if defined(BITS_PER_BYTE)
+#if BITS_PER_BYTE != pg_BITS_PER_BYTE
+#error "incompatible byte widths between NSPR and postgres"
+#endif
+#else
+#define BITS_PER_BYTE pg_BITS_PER_BYTE
+#endif
+#undef pg_BITS_PER_BYTE
+
+void
+pg_strong_random_init(void)
+{
+	/* No initialization needed on NSS */
+}
+
+bool
+pg_strong_random(void *buf, size_t len)
+{
+	NSSInitParameters params;
+	NSSInitContext *nss_context;
+	SECStatus	status;
+
+	memset(&params, 0, sizeof(params));
+	params.length = sizeof(params);
+	nss_context = NSS_InitContext("", "", "", "", &params,
+								  NSS_INIT_READONLY | NSS_INIT_NOCERTDB |
+								  NSS_INIT_NOMODDB | NSS_INIT_FORCEOPEN |
+								  NSS_INIT_NOROOTINIT | NSS_INIT_PK11RELOAD);
+
+	if (!nss_context)
+		return false;
+
+	status = PK11_GenerateRandom(buf, len);
+	NSS_ShutdownContext(nss_context);
+
+	if (status == SECSuccess)
+		return true;
+
+	return false;
+}
+
+#else							/* not USE_OPENSSL, USE_NSS or WIN32 */
 
 /*
  * Without OpenSSL or Win32 support, just read /dev/urandom ourselves.
-- 
2.21.1 (Apple Git-122.3)

From c03bc0ffb8c0401a1f8c00d01ef5c3f395a8a7f0 Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Wed, 28 Oct 2020 11:26:31 +0100
Subject: [PATCH v22 4/6] NSS Documentation

---
 doc/src/sgml/acronyms.sgml     |  43 ++++++++++++
 doc/src/sgml/config.sgml       |  28 +++++++-
 doc/src/sgml/installation.sgml |  30 +++++++-
 doc/src/sgml/libpq.sgml        |  99 +++++++++++++++++++++++++-
 doc/src/sgml/runtime.sgml      | 123 +++++++++++++++++++++++++++++++--
 5 files changed, 311 insertions(+), 12 deletions(-)

diff --git a/doc/src/sgml/acronyms.sgml b/doc/src/sgml/acronyms.sgml
index 4e5ec983c0..7b02c8a622 100644
--- a/doc/src/sgml/acronyms.sgml
+++ b/doc/src/sgml/acronyms.sgml
@@ -441,6 +441,28 @@
     </listitem>
    </varlistentry>
 
+   <varlistentry>
+    <term><acronym>NSPR</acronym></term>
+    <listitem>
+     <para>
+      <ulink
+      url="https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSPR">
+      Netscape Portable Runtime</ulink>
+     </para>
+    </listitem>
+   </varlistentry>
+
+   <varlistentry>
+    <term><acronym>NSS</acronym></term>
+    <listitem>
+     <para>
+      <ulink
+      url="https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS">
+      Network Security Services</ulink>
+     </para>
+    </listitem>
+   </varlistentry>
+
    <varlistentry>
     <term><acronym>ODBC</acronym></term>
     <listitem>
@@ -539,6 +561,17 @@
     </listitem>
    </varlistentry>
 
+   <varlistentry>
+    <term><acronym>PKCS#12</acronym></term>
+    <listitem>
+     <para>
+      <ulink
+      url="https://en.wikipedia.org/wiki/PKCS_12">
+      Public-Key Cryptography Standards #12</ulink>
+     </para>
+    </listitem>
+   </varlistentry>
+
    <varlistentry>
     <term><acronym>PL</acronym></term>
     <listitem>
@@ -684,6 +717,16 @@
     </listitem>
    </varlistentry>
 
+   <varlistentry>
+    <term><acronym>TLS</acronym></term>
+    <listitem>
+     <para>
+      <ulink url="https://en.wikipedia.org/wiki/Transport_Layer_Security">
+      Transport Layer Security</ulink>
+     </para>
+    </listitem>
+   </varlistentry>
+
    <varlistentry>
     <term><acronym>TOAST</acronym></term>
     <listitem>
diff --git a/doc/src/sgml/config.sgml b/doc/src/sgml/config.sgml
index 82864bbb24..6738f8001f 100644
--- a/doc/src/sgml/config.sgml
+++ b/doc/src/sgml/config.sgml
@@ -1236,6 +1236,23 @@ include_dir 'conf.d'
       </listitem>
      </varlistentry>
 
+     <varlistentry id="guc-ssl-database" xreflabel="ssl_database">
+      <term><varname>ssl_database</varname> (<type>string</type>)
+      <indexterm>
+       <primary><varname>ssl_database</varname> configuration parameter</primary>
+      </indexterm>
+      </term>
+      <listitem>
+       <para>
+        Specifies the name of the file containing the server certificates and
+        keys when using <productname>NSS</productname> for <acronym>SSL</acronym>
+        connections. This parameter can only be set in the
+        <filename>postgresql.conf</filename> file or on the server command
+        line.
+       </para>
+      </listitem>
+     </varlistentry>
+
      <varlistentry id="guc-ssl-ciphers" xreflabel="ssl_ciphers">
       <term><varname>ssl_ciphers</varname> (<type>string</type>)
       <indexterm>
@@ -1252,7 +1269,9 @@ include_dir 'conf.d'
         connections using TLS version 1.2 and lower are affected.  There is
         currently no setting that controls the cipher choices used by TLS
         version 1.3 connections.  The default value is
-        <literal>HIGH:MEDIUM:+3DES:!aNULL</literal>.  The default is usually a
+        <literal>HIGH:MEDIUM:+3DES:!aNULL</literal> for servers which have
+        been built with <productname>OpenSSL</productname> as the
+        <acronym>SSL</acronym> library.  The default is usually a
         reasonable choice unless you have specific security requirements.
        </para>
 
@@ -1454,8 +1473,11 @@ include_dir 'conf.d'
        <para>
         Sets an external command to be invoked when a passphrase for
         decrypting an SSL file such as a private key needs to be obtained.  By
-        default, this parameter is empty, which means the built-in prompting
-        mechanism is used.
+        default, this parameter is empty. When the server is using
+        <productname>OpenSSL</productname>, this means the built-in prompting
+        mechanism is used. When using <productname>NSS</productname>, there is
+        no default prompting so a blank callback will be used returning an
+        empty password.
        </para>
        <para>
         The command must print the passphrase to the standard output and exit
diff --git a/doc/src/sgml/installation.sgml b/doc/src/sgml/installation.sgml
index 0ac1cb9999..bd09124fb0 100644
--- a/doc/src/sgml/installation.sgml
+++ b/doc/src/sgml/installation.sgml
@@ -250,7 +250,7 @@ su - postgres
 
     <listitem>
      <para>
-      You need <productname>OpenSSL</productname>, if you want to support
+      You need a supported <acronym>SSL</acronym> library, if you want to support
       encrypted client connections.  <productname>OpenSSL</productname> is
       also required for random number generation on platforms that do not
       have <filename>/dev/urandom</filename> (except Windows).  The minimum
@@ -966,6 +966,31 @@ build-postgresql:
        </listitem>
       </varlistentry>
 
+      <varlistentry>
+       <term><option>--with-nss</option>
+       <indexterm>
+        <primary>NSS</primary>
+        <secondary>NSPR</secondary>
+        <seealso>SSL</seealso>
+       </indexterm>
+       </term>
+       <listitem>
+        <para>
+         Build with support for <acronym>SSL</acronym> (encrypted)
+         connections using <productname>NSS</productname>. This requires the
+         <productname>NSS</productname> package to be installed. Additionally,
+         <productname>NSS</productname> requires <productname>NSPR</productname>
+         to be installed. <filename>configure</filename> will check for the
+         required header files and libraries to make sure that your
+         <productname>NSS</productname> installation is sufficient before
+         proceeding.
+        </para>
+        <para>
+         This option is incompatible with <literal>--with-openssl</literal>.
+        </para>
+       </listitem>
+      </varlistentry>
+
       <varlistentry>
        <term><option>--with-openssl</option>
        <indexterm>
@@ -982,6 +1007,9 @@ build-postgresql:
          your <productname>OpenSSL</productname> installation is sufficient
          before proceeding.
         </para>
+        <para>
+         This option is incompatible with <literal>--with-nss</literal>.
+        </para>
        </listitem>
       </varlistentry>
 
diff --git a/doc/src/sgml/libpq.sgml b/doc/src/sgml/libpq.sgml
index 2bb3bf77e4..3225736f56 100644
--- a/doc/src/sgml/libpq.sgml
+++ b/doc/src/sgml/libpq.sgml
@@ -830,6 +830,12 @@ int callback_fn(char *buf, int size, PGconn *conn);
        <function>longjmp(...)</function>, etc. It must return normally.
       </para>
 
+      <para>
+        <function>PQsetSSLKeyPassHook_OpenSSL</function> is only available
+        when the server was compiled with <productname>OpenSSL</productname>
+        support.
+      </para>
+
      </listitem>
     </varlistentry>
 
@@ -846,6 +852,72 @@ PQsslKeyPassHook_OpenSSL_type PQgetSSLKeyPassHook_OpenSSL(void);
 </synopsis>
       </para>
 
+      <para>
+        <function>PQgetSSLKeyPassHook_OpenSSL</function> is only available
+        when the server was compiled with <productname>OpenSSL</productname>
+        support.
+      </para>
+
+     </listitem>
+    </varlistentry>
+
+    <varlistentry id="libpq-pqsetsslkeypasshook-nss">
+     <term><function>PQsetSSLKeyPassHook_nss</function><indexterm><primary>PQsetSSLKeyPassHook_nss</primary></indexterm></term>
+     <listitem>
+      <para>
+       <function>PQsetSSLKeyPassHook_nss</function> lets an application override
+       <application>libpq</application>'s default handling of password protected
+       objects in the <application>NSS</application> database using
+       <xref linkend="libpq-connect-sslpassword"/> or interactive prompting.
+
+<synopsis>
+void PQsetSSLKeyPassHook_nss(PQsslKeyPassHook_nss_type hook);
+</synopsis>
+
+       The application passes a pointer to a callback function with signature:
+<programlisting>
+char *callback_fn(PK11SlotInfo *slot, PRBool retry, void *arg);
+</programlisting>
+       which <application>libpq</application> will call
+       <emphasis>instead of</emphasis> its default
+       <function>PQdefaultSSLKeyPassHook_nss</function> password handler. The
+       callback should determine the password for the token and return a
+       pointer to it. The returned pointer should be allocated with the NSS
+       <function>PORT_Strdup</function> function. The token for which the
+       password is requested is recorded in the slot anc can be identified by
+       calling <function>PK11_GetTokenName</function>. If no password is
+       known, the callback should return <literal>NULL</literal>. The memory
+       will be owned by <productname>NSS</productname> and should not be
+       freed.
+      </para>
+
+      <para>
+        <function>PQsetSSLKeyPassHook_nss</function> is only available
+        when the server was compiled with <productname>NSS</productname>
+        support.
+      </para>
+     </listitem>
+    </varlistentry>
+
+    <varlistentry id="libpq-pqgetsslkeypasshook-nss">
+     <term><function>PQgetSSLKeyPassHook_nss</function><indexterm><primary>PQgetSSLKeyPassHook_nss</primary></indexterm></term>
+     <listitem>
+      <para>
+       <function>PQgetSSLKeyPassHook_nss</function> returns the current
+       <productname>NSS</productname> password hook, or <literal>NULL</literal>
+       if none has been set.
+
+<synopsis>
+PQsslKeyPassHook_nss_type PQgetSSLKeyPassHook_nss(void);
+</synopsis>
+      </para>
+
+      <para>
+        <function>PQgetSSLKeyPassHook_nss</function> is only available
+        when the server was compiled with <productname>nss</productname>
+        support.
+      </para>
+
      </listitem>
     </varlistentry>
 
@@ -2497,6 +2569,8 @@ void *PQsslStruct(const PGconn *conn, const char *struct_name);
       </para>
       <para>
        The struct(s) available depend on the SSL implementation in use.
+      </para>
+      <para>
        For <productname>OpenSSL</productname>, there is one struct,
        available under the name "OpenSSL", and it returns a pointer to the
        <productname>OpenSSL</productname> <literal>SSL</literal> struct.
@@ -2520,9 +2594,14 @@ void *PQsslStruct(const PGconn *conn, const char *struct_name);
 ]]></programlisting>
       </para>
       <para>
-       This structure can be used to verify encryption levels, check server
-       certificates, and more. Refer to the <productname>OpenSSL</productname>
-       documentation for information about this structure.
+       For <productname>NSS</productname>, there is one struct available under
+       the name "NSS", and it returns a pointer to the
+       <productname>NSS</productname> <literal>PRFileDesc</literal>.
+      </para>
+      <para>
+       These structures can be used to verify encryption levels, check server
+       certificates, and more. Refer to the <acronym>SSL</acronym> library
+       documentation for information about these structures.
       </para>
      </listitem>
     </varlistentry>
@@ -2549,6 +2628,10 @@ void *PQgetssl(const PGconn *conn);
        <xref linkend="libpq-PQsslInUse"/> instead, and for more details about the
        connection, use <xref linkend="libpq-PQsslAttribute"/>.
       </para>
+      <para>
+       This function returns <literal>NULL</literal> when <acronym>SSL</acronym>
+       librariaes other than <productname>OpenSSL</productname> are used.
+      </para>
      </listitem>
     </varlistentry>
 
@@ -7982,6 +8065,11 @@ void PQinitOpenSSL(int do_ssl, int do_crypto);
        before first opening a database connection.  Also be sure that you
        have done that initialization before opening a database connection.
       </para>
+
+      <para>
+       This function does nothing when using <productname>NSS</productname> as
+       the <acronym>SSL</acronym> library.
+      </para>
      </listitem>
     </varlistentry>
 
@@ -8008,6 +8096,11 @@ void PQinitSSL(int do_ssl);
        might be preferable for applications that need to work with older
        versions of <application>libpq</application>.
       </para>
+
+      <para>
+       This function does nothing when using <productname>NSS</productname> as
+       the <acronym>SSL</acronym> library.
+      </para>
      </listitem>
     </varlistentry>
    </variablelist>
diff --git a/doc/src/sgml/runtime.sgml b/doc/src/sgml/runtime.sgml
index 283352d3a4..0900ebf28f 100644
--- a/doc/src/sgml/runtime.sgml
+++ b/doc/src/sgml/runtime.sgml
@@ -2183,15 +2183,21 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
 
   <indexterm zone="ssl-tcp">
    <primary>SSL</primary>
+   <secondary>TLS</secondary>
   </indexterm>
 
   <para>
    <productname>PostgreSQL</productname> has native support for using
    <acronym>SSL</acronym> connections to encrypt client/server communications
    for increased security. This requires that
-   <productname>OpenSSL</productname> is installed on both client and
+   a supported TLS library is installed on both client and
    server systems and that support in <productname>PostgreSQL</productname> is
    enabled at build time (see <xref linkend="installation"/>).
+   Supported libraries are <productname>OpenSSL</productname> and
+   <productname>NSS</productname>. The terms <acronym>SSL</acronym> and
+   <acronym>TLS</acronym> are often used interchangeably to mean a secure
+   connection using a <acronym>TLS</acronym> protocol, even though
+   <acronym>SSL</acronym> protocols are no longer supported.
   </para>
 
   <sect2 id="ssl-setup">
@@ -2211,8 +2217,13 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
   </para>
 
   <para>
-   To start in <acronym>SSL</acronym> mode, files containing the server certificate
-   and private key must exist.  By default, these files are expected to be
+   To start in <acronym>SSL</acronym> mode, a server certificate
+   and private key must exist. The below sections on the different libraries
+   will discuss how to configure these.
+  </para>
+   
+  <para>
+   By default, these files are expected to be
    named <filename>server.crt</filename> and <filename>server.key</filename>, respectively, in
    the server's data directory, but other names and locations can be specified
    using the configuration parameters <xref linkend="guc-ssl-cert-file"/>
@@ -2302,6 +2313,18 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
   </note>
   </sect2>
 
+  <sect2 id="ssl-nss-config">
+   <title>NSS Configuration</title>
+
+  <para>
+   <productname>PostgreSQL</productname> will look for certificates and keys
+   in the <productname>NSS</productname> database specified by the parameter
+   <xref linkend="guc-ssl-database"/> in <filename>postgresql.conf</filename>.
+   The parameters for certificate and key filenames are used to identify the
+   nicknames in the database.
+  </para>
+  </sect2>
+
   <sect2 id="ssl-client-certificates">
    <title>Using Client Certificates</title>
 
@@ -2376,7 +2399,7 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
   </sect2>
 
   <sect2 id="ssl-server-files">
-   <title>SSL Server File Usage</title>
+   <title>SSL Server File Parameter Usage</title>
 
    <para>
     <xref linkend="ssl-file-usage"/> summarizes the files that are
@@ -2423,6 +2446,14 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
       <entry>client certificate must not be on this list</entry>
      </row>
 
+     <row>
+      <entry><xref linkend="guc-ssl-database"/></entry>
+      <entry>certificate database</entry>
+      <entry>contains server certificates, keys and revocation lists; only
+      used when <productname>PostgreSQL</productname> is built with support
+      for <productname>NSS</productname>.</entry>
+     </row>
+
     </tbody>
    </tgroup>
   </table>
@@ -2446,7 +2477,7 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
   </sect2>
 
   <sect2 id="ssl-certificate-creation">
-   <title>Creating Certificates</title>
+   <title>Creating Certificates with OpenSSL</title>
 
    <para>
      To create a simple self-signed certificate for the server, valid for 365
@@ -2550,6 +2581,88 @@ openssl x509 -req -in server.csr -text -days 365 \
    </para>
   </sect2>
 
+  <sect2 id="nss-certificate-database">
+   <title>NSS Certificate Databases</title>
+
+   <para>
+    When using <productname>NSS</productname>, all certificates and keys must
+    be loaded into an <productname>NSS</productname> certificate database.
+   </para>
+
+   <para>
+    To create a new <productname>NSS</productname> certificate database and
+    load the certificates created in <xref linkend="ssl-certificate-creation" />,
+    use the following <productname>NSS</productname> commands:
+<programlisting>
+certutil -d "sql:server.db" -N --empty-password
+certutil -d "sql:server.db" -A -n server.crt -i server.crt -t "CT,C,C"
+certutil -d "sql:server.db" -A -n root.crt -i root.crt -t "CT,C,C"
+</programlisting>
+    This will give the certificate the filename as the nickname identifier in
+    the database which is created as <filename>server.db</filename>.
+   </para>
+   <para>
+    Then load the server key, which require converting it to
+    <acronym>PKCS#12</acronym> format using the
+    <productname>OpenSSL</productname> tools:
+<programlisting>
+openssl pkcs12 -export -out server.pfx -inkey server.key -in server.crt \
+  -certfile root.crt -passout pass:
+pk12util -i server.pfx -d server.db -W ''
+</programlisting>
+   </para>
+   <para>
+    Finally a certificate revocation list can be loaded with the following
+    commands:
+<programlisting>
+crlutil -I -i server.crl -d server.db -B
+</programlisting>
+   </para>
+  </sect2>
+
+  <sect2 id="nss-ssl-certificate-creation" />
+   <title>Creating Certificates with NSS</title>
+
+   <para>
+    To create a simple self-signed CA and certificate for the server, use the
+    following NSS commands. Replace
+    <replaceable>*.yourdomain.com</replaceable> with the server's host
+    name. Remove <replaceable>--empty-password</replaceable> in order to set
+    a password protecting the databases. The password can be passed to
+    <application>certutil</certutil> with the <literal>-f</literal> parameter.
+    First create a self-signed CA. To use a different certificate validity
+    time than the default, use <replaceable>-v</replaceable> to specify the
+    number of months of validity.
+<programlisting>
+mkdir root_ca.db
+certutil -N -d "sql:root_ca.db/" --empty-password
+certutil -S -d "sql:root_ca.db/" -n root_ca -s "CN=<replaceable>ca.yourdomain.com</replaceable>" \
+  -x -k rsa -g 2048 -m <replaceable>5432</replaceable> -t CTu,CTu,CTu \
+  --keyUsage certSigning -2 --nsCertType sslCA,smimeCA,objectSigningCA \
+  -Z SHA256
+certutil -L -d "sql:root_ca.db/" -n root_ca -a > root_ca.pem
+</programlisting>
+    Now create a server certificate database, and create a certificate signing
+    request for the CA. Then sign the request with the already created CA and
+    insert the certificate chain into the certificate database.
+<programlisting>
+mkdir server_cert.db
+certutil -N -d "sql:server_cert.db/" --empty-password
+certutil -R -d "sql:server_cert.db/" -s "CN=dbhost.yourdomain.com" \
+  -o server_cert.csr -g 2048 -Z SHA256
+
+certutil -C -d "sql:root_ca.db/" -c root_ca -i server_cert.csr \
+  -o server_cert.der -m <replaceable>5433</replaceable> \
+  --keyUsage keyEncipherment,dataEncipherment,digitalSignature \
+  --nsCertType sslServer -Z SHA256
+
+certutil -A -d "sql:server_cert.db/" -n root_ca -t CTu,CTu,CTu -a -i root_ca.pem
+certutil -A -d "sql:server_cert.db/" -n server_cert -t CTu,CTu,CTu -i server_cert.der
+</programlisting>
+    The server certificate is loaded into the certificate database as well as
+    the CA certificate in order to provide the chain of certificates.
+  </sect2>
+
  </sect1>
 
  <sect1 id="gssapi-enc">
-- 
2.21.1 (Apple Git-122.3)

From 6ff1c2cc4b39883ac315ef654d4a58804653fda7 Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Wed, 28 Oct 2020 11:34:37 +0100
Subject: [PATCH v22 5/6] NSS contrib modules

---
 contrib/Makefile            |   2 +-
 contrib/pgcrypto/Makefile   |   7 +-
 contrib/pgcrypto/nss.c      | 773 ++++++++++++++++++++++++++++++++++++
 contrib/sslinfo/sslinfo.c   |  32 ++
 doc/src/sgml/pgcrypto.sgml  |  38 +-
 doc/src/sgml/sslinfo.sgml   |  12 +-
 src/tools/msvc/Install.pm   |   3 +-
 src/tools/msvc/Mkvcbuild.pm |  12 +-
 8 files changed, 864 insertions(+), 15 deletions(-)
 create mode 100644 contrib/pgcrypto/nss.c

diff --git a/contrib/Makefile b/contrib/Makefile
index 7a4866e338..c2232e5a4d 100644
--- a/contrib/Makefile
+++ b/contrib/Makefile
@@ -52,7 +52,7 @@ SUBDIRS = \
 		unaccent	\
 		vacuumlo
 
-ifeq ($(with_openssl),yes)
+ifneq ($(with_ssl),no)
 SUBDIRS += sslinfo
 else
 ALWAYS_SUBDIRS += sslinfo
diff --git a/contrib/pgcrypto/Makefile b/contrib/pgcrypto/Makefile
index d881e85add..6f804bf032 100644
--- a/contrib/pgcrypto/Makefile
+++ b/contrib/pgcrypto/Makefile
@@ -7,11 +7,14 @@ INT_TESTS = sha2
 OSSL_SRCS = openssl.c pgp-mpi-openssl.c
 OSSL_TESTS = sha2 des 3des cast5
 
+NSS_SRCS = nss.c pgp-mpi-internal.c imath.c blf.c
+NSS_TESTS = sha2 des 3des
+
 ZLIB_TST = pgp-compression
 ZLIB_OFF_TST = pgp-zlib-DISABLED
 
-CF_SRCS = $(if $(subst no,,$(with_openssl)), $(OSSL_SRCS), $(INT_SRCS))
-CF_TESTS = $(if $(subst no,,$(with_openssl)), $(OSSL_TESTS), $(INT_TESTS))
+CF_SRCS = $(if $(findstring openssl, $(with_ssl)), $(OSSL_SRCS), $(if $(findstring nss, $(with_ssl)), $(NSS_SRCS), $(INT_SRCS)))
+CF_TESTS = $(if $(findstring openssl, $(with_ssl)), $(OSSL_TESTS), $(if $(findstring nss, $(with_ssl)), $(NSS_TESTS), $(INT_TESTS)))
 CF_PGP_TESTS = $(if $(subst no,,$(with_zlib)), $(ZLIB_TST), $(ZLIB_OFF_TST))
 
 SRCS = \
diff --git a/contrib/pgcrypto/nss.c b/contrib/pgcrypto/nss.c
new file mode 100644
index 0000000000..da66152d65
--- /dev/null
+++ b/contrib/pgcrypto/nss.c
@@ -0,0 +1,773 @@
+/*-------------------------------------------------------------------------
+ *
+ * nss.c
+ *	  Wrapper for using NSS as a backend for pgcrypto PX
+ *
+ *
+ * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ *	  contrib/pgcrypto/nss.c
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#include "postgres.h"
+
+#include "px.h"
+#include "blf.h"
+#include "utils/memutils.h"
+
+/*
+ * BITS_PER_BYTE is also defined in the NSPR header files, so we need to undef
+ * our version to avoid compiler warnings on redefinition.
+ */
+#define pg_BITS_PER_BYTE BITS_PER_BYTE
+#undef BITS_PER_BYTE
+
+#include <nss/nss.h>
+#include <nss/hasht.h>
+#include <nss/pk11func.h>
+#include <nss/pk11pub.h>
+#include <nss/secitem.h>
+#include <nss/sechash.h>
+#include <nss/secoid.h>
+#include <nss/secerr.h>
+
+/*
+ * Ensure that the colliding definitions match, else throw an error. In case
+ * NSPR has removed the definition for some reason, make sure to put ours
+ * back again.
+ */
+#if defined(BITS_PER_BYTE)
+#if BITS_PER_BYTE != pg_BITS_PER_BYTE
+#error "incompatible byte widths between NSPR and postgres"
+#endif
+#else
+#define BITS_PER_BYTE pg_BITS_PER_BYTE
+#endif
+#undef pg_BITS_PER_BYTE
+
+/*
+ * Define our own mechanisms for Blowfish as it's not implemented by NSS.
+ */
+#define BLOWFISH_CBC	(1)
+#define BLOWFISH_ECB	(2)
+
+/*
+ * Data structures for recording cipher implementations as well as ongoing
+ * cipher operations.
+ */
+typedef struct nss_digest
+{
+	NSSInitContext *context;
+	PK11Context *hash_context;
+	HASH_HashType hash_type;
+}			nss_digest;
+
+typedef struct cipher_implementation
+{
+	/* Function pointers to cipher operations */
+	int			(*init) (PX_Cipher *pxc, const uint8 *key, unsigned klen, const uint8 *iv);
+	unsigned	(*get_block_size) (PX_Cipher *pxc);
+	unsigned	(*get_key_size) (PX_Cipher *pxc);
+	unsigned	(*get_iv_size) (PX_Cipher *pxc);
+	int			(*encrypt) (PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res);
+	int			(*decrypt) (PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res);
+	void		(*free) (PX_Cipher *pxc);
+
+	/* The mechanism describing the cipher used */
+	union
+	{
+		CK_MECHANISM_TYPE nss;
+		CK_ULONG	internal;
+	}			mechanism;
+	int			keylen;
+	bool		is_nss;
+}			cipher_implementation;
+
+typedef struct nss_cipher
+{
+	const cipher_implementation *impl;
+	NSSInitContext *context;
+	PK11Context *crypt_context;
+	SECItem    *params;
+
+	PK11SymKey *encrypt_key;
+	PK11SymKey *decrypt_key;
+}			nss_cipher;
+
+typedef struct internal_cipher
+{
+	const cipher_implementation *impl;
+	BlowfishContext context;
+}			internal_cipher;
+
+typedef struct nss_cipher_ref
+{
+	const char *name;
+	const cipher_implementation *impl;
+}			nss_cipher_ref;
+
+/*
+ * Prototypes
+ */
+static unsigned nss_get_iv_size(PX_Cipher *pxc);
+static unsigned nss_get_block_size(PX_Cipher *pxc);
+
+/*
+ * nss_GetHashOidTagByHashType
+ *
+ * Returns the corresponding SECOidTag for the passed hash type. NSS 3.43
+ * includes HASH_GetHashOidTagByHashType for this purpose, but at the time of
+ * writing is not commonly available so we need our own version till then.
+ */
+static SECOidTag
+nss_GetHashOidTagByHashType(HASH_HashType type)
+{
+	if (type == HASH_AlgMD2)
+		return SEC_OID_MD2;
+	if (type == HASH_AlgMD5)
+		return SEC_OID_MD5;
+	if (type == HASH_AlgSHA1)
+		return SEC_OID_SHA1;
+	if (type == HASH_AlgSHA224)
+		return SEC_OID_SHA224;
+	if (type == HASH_AlgSHA256)
+		return SEC_OID_SHA256;
+	if (type == HASH_AlgSHA384)
+		return SEC_OID_SHA384;
+	if (type == HASH_AlgSHA512)
+		return SEC_OID_SHA512;
+
+	return SEC_OID_UNKNOWN;
+}
+
+static unsigned
+nss_digest_block_size(PX_MD *pxmd)
+{
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+	const SECHashObject *object;
+
+	object = HASH_GetHashObject(digest->hash_type);
+	return object->blocklength;
+}
+
+static unsigned
+nss_digest_result_size(PX_MD *pxmd)
+{
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+	const SECHashObject *object;
+
+	object = HASH_GetHashObject(digest->hash_type);
+	return object->length;
+}
+
+static void
+nss_digest_free(PX_MD *pxmd)
+{
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+	PRBool		free_ctx = PR_TRUE;
+
+	PK11_DestroyContext(digest->hash_context, free_ctx);
+	NSS_ShutdownContext(digest->context);
+}
+
+static void
+nss_digest_update(PX_MD *pxmd, const uint8 *data, unsigned dlen)
+{
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+
+	PK11_DigestOp(digest->hash_context, data, dlen);
+}
+
+static void
+nss_digest_reset(PX_MD *pxmd)
+{
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+
+	PK11_DigestBegin(digest->hash_context);
+}
+
+static void
+nss_digest_finish(PX_MD *pxmd, uint8 *dst)
+{
+	unsigned int outlen;
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+	const SECHashObject *object;
+
+	object = HASH_GetHashObject(digest->hash_type);
+	PK11_DigestFinal(digest->hash_context, dst, &outlen, object->length);
+}
+
+int
+px_find_digest(const char *name, PX_MD **res)
+{
+	PX_MD	   *pxmd;
+	NSSInitParameters params;
+	NSSInitContext *nss_context;
+	bool		found = false;
+	nss_digest *digest;
+	SECStatus	status;
+	SECOidData *hash;
+	HASH_HashType t;
+
+	/*
+	 * Initialize our own NSS context without a database backing it.
+	 */
+	memset(&params, 0, sizeof(params));
+	params.length = sizeof(params);
+	nss_context = NSS_InitContext("", "", "", "", &params,
+								  NSS_INIT_READONLY | NSS_INIT_NOCERTDB |
+								  NSS_INIT_NOMODDB | NSS_INIT_FORCEOPEN |
+								  NSS_INIT_NOROOTINIT | NSS_INIT_PK11RELOAD);
+
+	/*
+	 * There is no API function for looking up a digest algorithm from a name
+	 * string, but there is a publicly accessible array which can be scanned
+	 * for the name.
+	 */
+	for (t = HASH_AlgNULL + 1; t < HASH_AlgTOTAL; t++)
+	{
+		SECOidTag	hash_oid;
+		char	   *p;
+
+		hash_oid = nss_GetHashOidTagByHashType(t);
+
+		if (hash_oid == SEC_OID_UNKNOWN)
+			return PXE_NO_HASH;
+
+		hash = SECOID_FindOIDByTag(hash_oid);
+		if (pg_strcasecmp(hash->desc, name) == 0)
+		{
+			found = true;
+			break;
+		}
+
+		/*
+		 * NSS saves the algorithm names using SHA-xxx notation whereas
+		 * OpenSSL use SHAxxx. To make sure the user finds the requested
+		 * algorithm let's remove the dash and compare that spelling as well.
+		 */
+		if ((p = strchr(hash->desc, '-')) != NULL)
+		{
+			char		tmp[12];
+
+			memcpy(tmp, hash->desc, p - hash->desc);
+			memcpy(tmp + (p - hash->desc), p + 1, strlen(hash->desc) - (p - hash->desc) + 1);
+			if (pg_strcasecmp(tmp, name) == 0)
+			{
+				found = true;
+				break;
+			}
+		}
+	}
+
+	if (!found)
+		return PXE_NO_HASH;
+
+	digest = palloc(sizeof(*digest));
+
+	digest->context = nss_context;
+	digest->hash_context = PK11_CreateDigestContext(hash->offset);
+	digest->hash_type = t;
+	if (digest->hash_context == NULL)
+	{
+		pfree(digest);
+		return -1;
+	}
+
+	status = PK11_DigestBegin(digest->hash_context);
+	if (status != SECSuccess)
+	{
+		PK11_DestroyContext(digest->hash_context, PR_TRUE);
+		pfree(digest);
+		return -1;
+	}
+
+	pxmd = palloc(sizeof(*pxmd));
+	pxmd->result_size = nss_digest_result_size;
+	pxmd->block_size = nss_digest_block_size;
+	pxmd->reset = nss_digest_reset;
+	pxmd->update = nss_digest_update;
+	pxmd->finish = nss_digest_finish;
+	pxmd->free = nss_digest_free;
+	pxmd->p.ptr = (void *) digest;
+
+	*res = pxmd;
+
+	return 0;
+}
+
+static int
+bf_init(PX_Cipher *pxc, const uint8 *key, unsigned klen, const uint8 *iv)
+{
+	internal_cipher *cipher = (internal_cipher *) pxc->ptr;
+
+	blowfish_setkey(&cipher->context, key, klen);
+	if (iv)
+		blowfish_setiv(&cipher->context, iv);
+
+	return 0;
+}
+
+static int
+bf_encrypt(PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res)
+{
+	internal_cipher *cipher = (internal_cipher *) pxc->ptr;
+	uint8	   *buf;
+
+	if (dlen == 0)
+		return 0;
+
+	if (dlen & 7)
+		return PXE_NOTBLOCKSIZE;
+
+	buf = palloc(dlen);
+	memcpy(buf, data, dlen);
+
+	if (cipher->impl->mechanism.internal == BLOWFISH_ECB)
+		blowfish_encrypt_ecb(buf, dlen, &cipher->context);
+	else
+		blowfish_encrypt_cbc(buf, dlen, &cipher->context);
+
+	memcpy(res, buf, dlen);
+	pfree(buf);
+
+	return 0;
+}
+
+static int
+bf_decrypt(PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res)
+{
+	internal_cipher *cipher = (internal_cipher *) pxc->ptr;
+
+	if (dlen == 0)
+		return 0;
+
+	if (dlen & 7)
+		return PXE_NOTBLOCKSIZE;
+
+	memcpy(res, data, dlen);
+	if (cipher->impl->mechanism.internal == BLOWFISH_ECB)
+		blowfish_decrypt_ecb(res, dlen, &cipher->context);
+	else
+		blowfish_decrypt_cbc(res, dlen, &cipher->context);
+
+	return 0;
+}
+
+static void
+bf_free(PX_Cipher *pxc)
+{
+	internal_cipher *cipher = (internal_cipher *) pxc->ptr;
+
+	pfree(cipher);
+	pfree(pxc);
+}
+
+static int
+nss_symkey_blockcipher_init(PX_Cipher *pxc, const uint8 *key, unsigned klen,
+							const uint8 *iv)
+{
+	nss_cipher *cipher = (nss_cipher *) pxc->ptr;
+	SECItem		iv_item;
+	unsigned char *iv_item_data;
+	SECItem		key_item;
+	int			keylen;
+	PK11SlotInfo *slot;
+
+	if (cipher->impl->mechanism.nss == CKM_AES_CBC ||
+		cipher->impl->mechanism.nss == CKM_AES_ECB)
+	{
+		if (klen <= 128 / 8)
+			keylen = 128 / 8;
+		else if (klen <= 192 / 8)
+			keylen = 192 / 8;
+		else if (klen <= 256 / 8)
+			keylen = 256 / 8;
+		else
+			return PXE_CIPHER_INIT;
+	}
+	else
+		keylen = cipher->impl->keylen;
+
+	key_item.type = siBuffer;
+	key_item.data = (unsigned char *) key;
+	key_item.len = keylen;
+
+	/*
+	 * If hardware acceleration is configured in NSS one can theoretically get
+	 * a better slot by calling PK11_GetBestSlot() with the mechanism passed
+	 * to it. Unless there are complaints, using the simpler API will make
+	 * error handling easier though.
+	 */
+	slot = PK11_GetInternalSlot();
+	if (!slot)
+		return PXE_CIPHER_INIT;
+
+	/*
+	 * The key must be set up for the operation, and since we don't know at
+	 * this point whether we are asked to encrypt or decrypt we need to store
+	 * both versions.
+	 */
+	cipher->decrypt_key = PK11_ImportSymKey(slot, cipher->impl->mechanism.nss,
+											PK11_OriginUnwrap,
+											CKA_DECRYPT, &key_item,
+											NULL);
+	cipher->encrypt_key = PK11_ImportSymKey(slot, cipher->impl->mechanism.nss,
+											PK11_OriginUnwrap,
+											CKA_ENCRYPT, &key_item,
+											NULL);
+	PK11_FreeSlot(slot);
+
+	if (!cipher->decrypt_key || !cipher->encrypt_key)
+		return PXE_CIPHER_INIT;
+
+	if (iv)
+	{
+		iv_item.type = siBuffer;
+		iv_item.data = (unsigned char *) iv;
+		iv_item.len = nss_get_iv_size(pxc);
+	}
+	else
+	{
+		/*
+		 * The documentation states that either passing .data = 0; .len = 0;
+		 * in the iv_item, or NULL as iv_item, to PK11_ParamFromIV should be
+		 * done when IV is missing. That however leads to segfaults in the
+		 * library, the workaround that works in modern  library versions is
+		 * to pass in a keysized zeroed out IV.
+		 */
+		iv_item_data = palloc0(nss_get_iv_size(pxc));
+		iv_item.type = siBuffer;
+		iv_item.data = iv_item_data;
+		iv_item.len = nss_get_iv_size(pxc);
+	}
+
+	cipher->params = PK11_ParamFromIV(cipher->impl->mechanism.nss, &iv_item);
+
+	/* If we had to make a mock IV, free it once made into a param */
+	if (!iv)
+		pfree(iv_item_data);
+
+	if (cipher->params == NULL)
+		return PXE_CIPHER_INIT;
+
+	return 0;
+}
+
+static int
+nss_decrypt(PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res)
+{
+	nss_cipher *cipher = (nss_cipher *) pxc->ptr;
+	SECStatus	status;
+	int			outlen;
+
+	if (!cipher->crypt_context)
+	{
+		cipher->crypt_context =
+			PK11_CreateContextBySymKey(cipher->impl->mechanism.nss, CKA_DECRYPT,
+									   cipher->decrypt_key, cipher->params);
+	}
+
+	status = PK11_CipherOp(cipher->crypt_context, res, &outlen, dlen, data, dlen);
+	if (status != SECSuccess)
+		return PXE_DECRYPT_FAILED;
+
+	return 0;
+}
+
+static int
+nss_encrypt(PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res)
+{
+	nss_cipher *cipher = (nss_cipher *) pxc->ptr;
+	SECStatus	status;
+	int			outlen;
+
+	if (!cipher->crypt_context)
+	{
+		cipher->crypt_context =
+			PK11_CreateContextBySymKey(cipher->impl->mechanism.nss, CKA_ENCRYPT,
+									   cipher->decrypt_key, cipher->params);
+	}
+
+	status = PK11_CipherOp(cipher->crypt_context, res, &outlen, dlen, data, dlen);
+
+	if (status != SECSuccess)
+		return PXE_DECRYPT_FAILED;
+
+	return 0;
+}
+
+static void
+nss_free(PX_Cipher *pxc)
+{
+	nss_cipher *cipher = pxc->ptr;
+	PRBool		free_ctx = PR_TRUE;
+
+	PK11_FreeSymKey(cipher->encrypt_key);
+	PK11_FreeSymKey(cipher->decrypt_key);
+	PK11_DestroyContext(cipher->crypt_context, free_ctx);
+	NSS_ShutdownContext(cipher->context);
+	pfree(cipher);
+
+	pfree(pxc);
+}
+
+static unsigned
+nss_get_block_size(PX_Cipher *pxc)
+{
+	nss_cipher *cipher = pxc->ptr;
+
+	return PK11_GetBlockSize(cipher->impl->mechanism.nss, NULL);
+}
+
+static unsigned
+nss_get_key_size(PX_Cipher *pxc)
+{
+	nss_cipher *cipher = pxc->ptr;
+
+	return cipher->impl->keylen;
+}
+
+static unsigned
+nss_get_iv_size(PX_Cipher *pxc)
+{
+	nss_cipher *cipher = pxc->ptr;
+
+	return PK11_GetIVLength(cipher->impl->mechanism.nss);
+}
+
+static unsigned
+bf_get_block_size(PX_Cipher *pxc)
+{
+	return 8;
+}
+
+static unsigned
+bf_get_key_size(PX_Cipher *pxc)
+{
+	return 448 / 8;
+}
+
+static unsigned
+bf_get_iv_size(PX_Cipher *pxc)
+{
+	return 8;
+}
+
+/*
+ * Cipher Implementations
+ */
+static const cipher_implementation nss_des_cbc = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_DES_CBC,
+	.keylen = 8,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_des_ecb = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_DES_ECB,
+	.keylen = 8,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_des3_cbc = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_DES3_CBC,
+	.keylen = 24,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_des3_ecb = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_DES3_ECB,
+	.keylen = 24,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_aes_cbc = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_AES_CBC,
+	.keylen = 32,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_aes_ecb = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_AES_ECB,
+	.keylen = 32,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_bf_ecb = {
+	.init = bf_init,
+	.get_block_size = bf_get_block_size,
+	.get_key_size = bf_get_key_size,
+	.get_iv_size = bf_get_iv_size,
+	.encrypt = bf_encrypt,
+	.decrypt = bf_decrypt,
+	.free = bf_free,
+	.mechanism.internal = BLOWFISH_ECB,
+	.keylen = 56,
+	.is_nss = false
+};
+
+static const cipher_implementation nss_bf_cbc = {
+	.init = bf_init,
+	.get_block_size = bf_get_block_size,
+	.get_key_size = bf_get_key_size,
+	.get_iv_size = bf_get_iv_size,
+	.encrypt = bf_encrypt,
+	.decrypt = bf_decrypt,
+	.free = bf_free,
+	.mechanism.internal = BLOWFISH_CBC,
+	.keylen = 56,
+	.is_nss = false
+};
+
+/*
+ * Lookup table for finding the implementation based on a name. CAST5 as well
+ * as BLOWFISH are defined as cipher mechanisms in NSS but error out with
+ * SEC_ERROR_INVALID_ALGORITHM. Blowfish is implemented using the internal
+ * implementation while CAST5 isn't supported at all at this time,
+ */
+static const nss_cipher_ref nss_cipher_lookup[] = {
+	{"des", &nss_des_cbc},
+	{"des-cbc", &nss_des_cbc},
+	{"des-ecb", &nss_des_ecb},
+	{"des3-cbc", &nss_des3_cbc},
+	{"3des", &nss_des3_cbc},
+	{"3des-cbc", &nss_des3_cbc},
+	{"des3-ecb", &nss_des3_ecb},
+	{"3des-ecb", &nss_des3_ecb},
+	{"aes", &nss_aes_cbc},
+	{"aes-cbc", &nss_aes_cbc},
+	{"aes-ecb", &nss_aes_ecb},
+	{"rijndael", &nss_aes_cbc},
+	{"rijndael-cbc", &nss_aes_cbc},
+	{"rijndael-ecb", &nss_aes_ecb},
+	{"blowfish", &nss_bf_cbc},
+	{"blowfish-cbc", &nss_bf_cbc},
+	{"blowfish-ecb", &nss_bf_ecb},
+	{"bf", &nss_bf_cbc},
+	{"bf-cbc", &nss_bf_cbc},
+	{"bf-ecb", &nss_bf_ecb},
+	{NULL}
+};
+
+/*
+ * px_find_cipher
+ *
+ * Search for the requested cipher and see if there is support for it, and if
+ * so return an allocated object containing the playbook for how to encrypt
+ * and decrypt using the cipher.
+ */
+int
+px_find_cipher(const char *alias, PX_Cipher **res)
+{
+	const nss_cipher_ref *cipher_ref;
+	PX_Cipher  *px_cipher;
+	NSSInitParameters params;
+	NSSInitContext *nss_context;
+	nss_cipher *cipher;
+	internal_cipher *int_cipher;
+
+	for (cipher_ref = nss_cipher_lookup; cipher_ref->name; cipher_ref++)
+	{
+		if (strcmp(cipher_ref->name, alias) == 0)
+			break;
+	}
+
+	if (!cipher_ref->name)
+		return PXE_NO_CIPHER;
+
+	/*
+	 * Fill in the PX_Cipher to pass back to PX describing the operations to
+	 * perform in order to use the cipher.
+	 */
+	px_cipher = palloc(sizeof(*px_cipher));
+	px_cipher->block_size = cipher_ref->impl->get_block_size;
+	px_cipher->key_size = cipher_ref->impl->get_key_size;
+	px_cipher->iv_size = cipher_ref->impl->get_iv_size;
+	px_cipher->free = cipher_ref->impl->free;
+	px_cipher->init = cipher_ref->impl->init;
+	px_cipher->encrypt = cipher_ref->impl->encrypt;
+	px_cipher->decrypt = cipher_ref->impl->decrypt;
+
+	/*
+	 * Set the private data, which is different for NSS and internal ciphers
+	 */
+	if (cipher_ref->impl->is_nss)
+	{
+		/*
+		 * Initialize our own NSS context without a database backing it. At
+		 * some point we might want to allow users to use stored keys in the
+		 * database rather than passing them via SELECT encrypt(), and then
+		 * this need to be changed to open a user specified database.
+		 */
+		memset(&params, 0, sizeof(params));
+		params.length = sizeof(params);
+		nss_context = NSS_InitContext("", "", "", "", &params,
+									  NSS_INIT_READONLY | NSS_INIT_NOCERTDB |
+									  NSS_INIT_NOMODDB | NSS_INIT_FORCEOPEN |
+									  NSS_INIT_NOROOTINIT | NSS_INIT_PK11RELOAD);
+
+		/* nss_cipher is the private state struct for the operation */
+		cipher = palloc(sizeof(*cipher));
+		cipher->context = nss_context;
+		cipher->impl = cipher_ref->impl;
+		cipher->crypt_context = NULL;
+
+		px_cipher->ptr = cipher;
+	}
+	else
+	{
+		int_cipher = palloc0(sizeof(*int_cipher));
+
+		int_cipher->impl = cipher_ref->impl;
+		px_cipher->ptr = int_cipher;
+	}
+
+	*res = px_cipher;
+	return 0;
+}
diff --git a/contrib/sslinfo/sslinfo.c b/contrib/sslinfo/sslinfo.c
index 30cae0bb98..3aadd90aa6 100644
--- a/contrib/sslinfo/sslinfo.c
+++ b/contrib/sslinfo/sslinfo.c
@@ -9,9 +9,11 @@
 
 #include "postgres.h"
 
+#ifdef USE_OPENSSL
 #include <openssl/x509.h>
 #include <openssl/x509v3.h>
 #include <openssl/asn1.h>
+#endif
 
 #include "access/htup_details.h"
 #include "funcapi.h"
@@ -21,6 +23,7 @@
 
 PG_MODULE_MAGIC;
 
+#ifdef USE_OPENSSL
 static Datum X509_NAME_field_to_text(X509_NAME *name, text *fieldName);
 static Datum ASN1_STRING_to_text(ASN1_STRING *str);
 
@@ -31,6 +34,7 @@ typedef struct
 {
 	TupleDesc	tupdesc;
 } SSLExtensionInfoContext;
+#endif
 
 /*
  * Indicates whether current session uses SSL
@@ -131,6 +135,7 @@ ssl_client_serial(PG_FUNCTION_ARGS)
 }
 
 
+#ifdef USE_OPENSSL
 /*
  * Converts OpenSSL ASN1_STRING structure into text
  *
@@ -282,7 +287,23 @@ ssl_issuer_field(PG_FUNCTION_ARGS)
 	else
 		return result;
 }
+#endif							/* USE_OPENSSL */
 
+#ifdef USE_NSS
+PG_FUNCTION_INFO_V1(ssl_client_dn_field);
+Datum
+ssl_client_dn_field(PG_FUNCTION_ARGS)
+{
+	PG_RETURN_NULL();
+}
+
+PG_FUNCTION_INFO_V1(ssl_issuer_field);
+Datum
+ssl_issuer_field(PG_FUNCTION_ARGS)
+{
+	PG_RETURN_NULL();
+}
+#endif							/* USE_NSS */
 
 /*
  * Returns current client certificate subject as one string
@@ -338,6 +359,7 @@ ssl_issuer_dn(PG_FUNCTION_ARGS)
 }
 
 
+#ifdef USE_OPENSSL
 /*
  * Returns information about available SSL extensions.
  *
@@ -471,3 +493,13 @@ ssl_extension_info(PG_FUNCTION_ARGS)
 	/* All done */
 	SRF_RETURN_DONE(funcctx);
 }
+#endif							/* USE_OPENSSL */
+
+#ifdef USE_NSS
+PG_FUNCTION_INFO_V1(ssl_extension_info);
+Datum
+ssl_extension_info(PG_FUNCTION_ARGS)
+{
+	PG_RETURN_NULL();
+}
+#endif							/* USE_NSS */
diff --git a/doc/src/sgml/pgcrypto.sgml b/doc/src/sgml/pgcrypto.sgml
index 3d74e15ec9..9eb8a3f74d 100644
--- a/doc/src/sgml/pgcrypto.sgml
+++ b/doc/src/sgml/pgcrypto.sgml
@@ -45,8 +45,9 @@ digest(data bytea, type text) returns bytea
     <literal>sha224</literal>, <literal>sha256</literal>,
     <literal>sha384</literal> and <literal>sha512</literal>.
     If <filename>pgcrypto</filename> was built with
-    <productname>OpenSSL</productname>, more algorithms are available, as
-    detailed in <xref linkend="pgcrypto-with-without-openssl"/>.
+    <productname>OpenSSL</productname> or <productname>NSS</productname>,
+    more algorithms are available, as
+    detailed in <xref linkend="pgcrypto-with-without-openssl-nss"/>.
    </para>
 
    <para>
@@ -764,7 +765,7 @@ pgp_sym_encrypt(data, psw, 'compress-algo=1, cipher-algo=aes256')
     Which cipher algorithm to use.
    </para>
 <literallayout>
-Values: bf, aes128, aes192, aes256 (OpenSSL-only: <literal>3des</literal>, <literal>cast5</literal>)
+Values: bf, aes128, aes192, aes256 (OpenSSL-only: <literal>3des</literal>, <literal>cast5</literal>; NSS-only: <literal>3des</literal>)
 Default: aes128
 Applies to: pgp_sym_encrypt, pgp_pub_encrypt
 </literallayout>
@@ -1153,8 +1154,8 @@ gen_random_uuid() returns uuid
    <para>
     <filename>pgcrypto</filename> configures itself according to the findings of the
     main PostgreSQL <literal>configure</literal> script.  The options that
-    affect it are <literal>--with-zlib</literal> and
-    <literal>--with-openssl</literal>.
+    affect it are <literal>--with-zlib</literal>,
+    <literal>--with-openssl</literal> and <literal>--with-nss</literal>.
    </para>
 
    <para>
@@ -1169,14 +1170,16 @@ gen_random_uuid() returns uuid
     BIGNUM functions.
    </para>
 
-   <table id="pgcrypto-with-without-openssl">
-    <title>Summary of Functionality with and without OpenSSL</title>
-    <tgroup cols="3">
+   <table id="pgcrypto-with-without-openssl-nss">
+    <title>Summary of Functionality with and without external cryptographic
+      library</title>
+    <tgroup cols="4">
      <thead>
       <row>
        <entry>Functionality</entry>
        <entry>Built-in</entry>
        <entry>With OpenSSL</entry>
+       <entry>With NSS</entry>
       </row>
      </thead>
      <tbody>
@@ -1184,51 +1187,67 @@ gen_random_uuid() returns uuid
        <entry>MD5</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>SHA1</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>SHA224/256/384/512</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>Other digest algorithms</entry>
        <entry>no</entry>
        <entry>yes (Note 1)</entry>
+       <entry>yes (Note 1)</entry>
       </row>
       <row>
        <entry>Blowfish</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>AES</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>DES/3DES/CAST5</entry>
        <entry>no</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
+      </row>
+      <row>
+       <entry>CAST5</entry>
+       <entry>no</entry>
+       <entry>yes</entry>
+       <entry>no</entry>
       </row>
       <row>
        <entry>Raw encryption</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>PGP Symmetric encryption</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>PGP Public-Key encryption</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
      </tbody>
     </tgroup>
@@ -1241,7 +1260,8 @@ gen_random_uuid() returns uuid
    <orderedlist>
     <listitem>
      <para>
-      Any digest algorithm <productname>OpenSSL</productname> supports
+      Any digest algorithm <productname>OpenSSL</productname> and
+      <productname>NSS</productname> supports
       is automatically picked up.
       This is not possible with ciphers, which need to be supported
       explicitly.
diff --git a/doc/src/sgml/sslinfo.sgml b/doc/src/sgml/sslinfo.sgml
index 3213c039ca..d2270cbe7c 100644
--- a/doc/src/sgml/sslinfo.sgml
+++ b/doc/src/sgml/sslinfo.sgml
@@ -22,7 +22,8 @@
 
  <para>
   This extension won't build at all unless the installation was
-  configured with <literal>--with-openssl</literal>.
+  configured with SSL support, such as <literal>--with-openssl</literal>
+  or <literal>--with-nss</literal>.
  </para>
 
  <sect2>
@@ -208,6 +209,9 @@ emailAddress
      the X.500 and X.509 standards, so you cannot just assign arbitrary
      meaning to them.
     </para>
+    <para>
+     This function is only available when using <productname>OpenSSL</productname>.
+    </para>
     </listitem>
    </varlistentry>
 
@@ -223,6 +227,9 @@ emailAddress
      Same as <function>ssl_client_dn_field</function>, but for the certificate issuer
      rather than the certificate subject.
     </para>
+    <para>
+     This function is only available when using <productname>OpenSSL</productname>.
+    </para>
     </listitem>
    </varlistentry>
 
@@ -238,6 +245,9 @@ emailAddress
      Provide information about extensions of client certificate: extension name,
      extension value, and if it is a critical extension.
     </para>
+    <para>
+     This function is only available when using <productname>OpenSSL</productname>.
+    </para>
     </listitem>
    </varlistentry>
   </variablelist>
diff --git a/src/tools/msvc/Install.pm b/src/tools/msvc/Install.pm
index ea3af48777..afe72a7e97 100644
--- a/src/tools/msvc/Install.pm
+++ b/src/tools/msvc/Install.pm
@@ -438,7 +438,8 @@ sub CopyContribFiles
 		{
 			# These configuration-based exclusions must match vcregress.pl
 			next if ($d eq "uuid-ossp"  && !defined($config->{uuid}));
-			next if ($d eq "sslinfo"    && !defined($config->{openssl}));
+			next if ($d eq "sslinfo"    && !defined($config->{openssl})
+			  && !defined($config->{nss}));
 			next if ($d eq "xml2"       && !defined($config->{xml}));
 			next if ($d =~ /_plperl$/   && !defined($config->{perl}));
 			next if ($d =~ /_plpython$/ && !defined($config->{python}));
diff --git a/src/tools/msvc/Mkvcbuild.pm b/src/tools/msvc/Mkvcbuild.pm
index a21eb088b3..0c489f9f34 100644
--- a/src/tools/msvc/Mkvcbuild.pm
+++ b/src/tools/msvc/Mkvcbuild.pm
@@ -444,9 +444,14 @@ sub mkvcbuild
 		push @contrib_excludes, 'xml2';
 	}
 
+	if (!$solution->{options}->{openssl} && !$solution->{options}->{nss})
+	{
+		push @contrib_excludes, 'sslinfo';
+	}
+
 	if (!$solution->{options}->{openssl})
 	{
-		push @contrib_excludes, 'sslinfo', 'ssl_passphrase_callback';
+		push @contrib_excludes, 'ssl_passphrase_callback';
 	}
 
 	if (!$solution->{options}->{uuid})
@@ -476,6 +481,11 @@ sub mkvcbuild
 		$pgcrypto->AddFiles('contrib/pgcrypto', 'openssl.c',
 			'pgp-mpi-openssl.c');
 	}
+	elsif ($solution->{options}->{nss})
+	{
+		$pgcrypto->AddFiles('contrib/pgcrypto', 'nss.c',
+			'pgp-mpi-internal.c', 'imath.c', 'blf.c');
+	}
 	else
 	{
 		$pgcrypto->AddFiles(
-- 
2.21.1 (Apple Git-122.3)

From 52445591ec9154acf6497f1d787467bff10a2d13 Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Mon, 18 Jan 2021 13:04:49 +0100
Subject: [PATCH v22 6/6] NSS cryptohash support

---
 src/common/Makefile         |   5 +
 src/common/cryptohash_nss.c | 243 ++++++++++++++++++++++++++++++++++++
 2 files changed, 248 insertions(+)
 create mode 100644 src/common/cryptohash_nss.c

diff --git a/src/common/Makefile b/src/common/Makefile
index 7a4b3dad5d..5a25e5b390 100644
--- a/src/common/Makefile
+++ b/src/common/Makefile
@@ -85,11 +85,16 @@ OBJS_COMMON += \
 	protocol_openssl.o \
 	cryptohash_openssl.o
 else
+ifeq ($(with_ssl),nss)
+OBJS_COMMON += \
+	cryptohash_nss.o
+else
 OBJS_COMMON += \
 	cryptohash.o \
 	md5.o \
 	sha2.o
 endif
+endif
 
 # A few files are currently only built for frontend, not server
 # (Mkvcbuild.pm has a copy of this list, too).  logging.c is excluded
diff --git a/src/common/cryptohash_nss.c b/src/common/cryptohash_nss.c
new file mode 100644
index 0000000000..9cd9c9f3f3
--- /dev/null
+++ b/src/common/cryptohash_nss.c
@@ -0,0 +1,243 @@
+/*-------------------------------------------------------------------------
+ *
+ * cryptohash_nss.c
+ *	  Set of wrapper routines on top of NSS to support cryptographic
+ *	  hash functions.
+ *
+ * This should only be used if code is compiled with NSS support.
+ *
+ * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ *		  src/common/cryptohash_nss.c
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#ifndef FRONTEND
+#include "postgres.h"
+#else
+#include "postgres_fe.h"
+#endif
+
+/*
+ * BITS_PER_BYTE is also defined in the NSPR header files, so we need to undef
+ * our version to avoid compiler warnings on redefinition.
+ */
+#define pg_BITS_PER_BYTE BITS_PER_BYTE
+#undef BITS_PER_BYTE
+
+#include <nss/nss.h>
+#include <nss/hasht.h>
+#include <nss/pk11func.h>
+#include <nss/pk11pub.h>
+#include <nss/secitem.h>
+#include <nss/sechash.h>
+#include <nss/secoid.h>
+#include <nss/secerr.h>
+
+/*
+ * Ensure that the colliding definitions match, else throw an error. In case
+ * NSPR has removed the definition for some reason, make sure to put ours
+ * back again.
+ */
+#if defined(BITS_PER_BYTE)
+#if BITS_PER_BYTE != pg_BITS_PER_BYTE
+#error "incompatible byte widths between NSPR and postgres"
+#endif
+#else
+#define BITS_PER_BYTE pg_BITS_PER_BYTE
+#endif
+#undef pg_BITS_PER_BYTE
+
+#include "common/cryptohash.h"
+#ifndef FRONTEND
+#include "utils/memutils.h"
+#include "utils/resowner.h"
+#include "utils/resowner_private.h"
+#endif
+
+/*
+ * Internal pg_cryptohash_ctx structure.
+ */
+struct pg_cryptohash_ctx
+{
+	pg_cryptohash_type type;
+
+	NSSInitContext *nss_context;
+	PK11Context *pk11_context;
+	HASH_HashType hash_type;
+
+#ifndef FRONTEND
+	ResourceOwner resowner;
+#endif
+};
+
+/*
+ * pg_cryptohash_create
+ *
+ * Create and allocate a new hash context. Returns NULL on failure in the
+ * frontend, and raise error without returning in the backend.
+ */
+pg_cryptohash_ctx *
+pg_cryptohash_create(pg_cryptohash_type type)
+{
+	NSSInitParameters params;
+	pg_cryptohash_ctx *ctx;
+	SECOidData *hash;
+
+#ifndef FRONTEND
+	/*
+	 * Make sure that the resource owner has space to remember this reference.
+	 * This can error out with "out of memory", so do this before any other
+	 * allocation to avoid leaking.
+	 */
+	ResourceOwnerEnlargeCryptoHash(CurrentResourceOwner);
+	ctx = MemoryContextAlloc(TopMemoryContext, sizeof(pg_cryptohash_ctx));
+#else
+	ctx = pg_malloc(sizeof(pg_cryptohash_ctx));
+#endif
+
+	if (!ctx)
+		goto error;
+
+	switch(type)
+	{
+		case PG_MD5:
+			ctx->hash_type = SEC_OID_MD5;
+			break;
+		case PG_SHA224:
+			ctx->hash_type = SEC_OID_SHA224;
+			break;
+		case PG_SHA256:
+			ctx->hash_type = SEC_OID_SHA256;
+			break;
+		case PG_SHA384:
+			ctx->hash_type = SEC_OID_SHA384;
+			break;
+		case PG_SHA512:
+			ctx->hash_type = SEC_OID_SHA512;
+			break;
+	}
+
+	/*
+	 * Initialize our own NSS context without a database backing it.
+	 */
+	memset(&params, 0, sizeof(params));
+	params.length = sizeof(params);
+	ctx->nss_context = NSS_InitContext("", "", "", "", &params,
+									   NSS_INIT_READONLY | NSS_INIT_NOCERTDB |
+									   NSS_INIT_NOMODDB | NSS_INIT_FORCEOPEN |
+									   NSS_INIT_NOROOTINIT | NSS_INIT_PK11RELOAD);
+	if (!ctx->nss_context)
+	{
+		explicit_bzero(ctx, sizeof(pg_cryptohash_ctx));
+		pfree(ctx);
+		goto error;
+	}
+	ctx->type = type;
+	hash = SECOID_FindOIDByTag(ctx->hash_type);
+	ctx->pk11_context = PK11_CreateDigestContext(hash->offset);
+	if (!ctx->pk11_context)
+	{
+		explicit_bzero(ctx, sizeof(pg_cryptohash_ctx));
+		pfree(ctx);
+		goto error;
+	}
+
+#ifndef FRONTEND
+	ctx->resowner = CurrentResourceOwner;
+	ResourceOwnerRememberCryptoHash(CurrentResourceOwner,
+									PointerGetDatum(ctx));
+#endif
+
+	return ctx;
+
+error:
+#ifndef FRONTEND
+	ereport(ERROR,
+			(errcode(ERRCODE_OUT_OF_MEMORY),
+			 errmsg("out of memory")));
+#endif
+	return NULL;
+}
+
+/*
+ * pg_cryptohash_init
+ *			Initialize the passed hash context
+ *
+ * Returns 0 on success, -1 on failure.
+ */
+int
+pg_cryptohash_init(pg_cryptohash_ctx *ctx)
+{
+	SECStatus		status;
+
+	status = PK11_DigestBegin(ctx->pk11_context);
+
+	if (status != SECSuccess)
+		return 1;
+	return 0;
+}
+
+/*
+ * pg_cryptohash_update
+ *
+ * Update a hash context.  Returns 0 on success, -1 on failure.
+ */
+int
+pg_cryptohash_update(pg_cryptohash_ctx *ctx, const uint8 *data, size_t len)
+{
+	SECStatus	status;
+
+	if (ctx == NULL)
+		return -1;
+	
+	status = PK11_DigestOp(ctx->pk11_context, data, len);
+	if (status != SECSuccess)
+		return -1;
+	
+	return 0;
+}
+
+/*
+ * pg_cryptohash_final
+ *
+ * Finalize a hash context.  Returns 0 on success, -1 on failure.
+ */
+int
+pg_cryptohash_final(pg_cryptohash_ctx *ctx, uint8 *dest)
+{
+	SECStatus	status;
+	unsigned int outlen;
+	const SECHashObject *object;
+
+	object = HASH_GetHashObject(ctx->hash_type);
+	status = PK11_DigestFinal(ctx->pk11_context, dest, &outlen, object->length);
+
+	if (status != SECSuccess)
+		return -1;
+	return 0;
+}
+
+/*
+ * pg_cryptohash_free
+ *
+ * Free a hash context and the associated NSS context.
+ */
+void
+pg_cryptohash_free(pg_cryptohash_ctx *ctx)
+{
+	PRBool		free_context = PR_TRUE;
+	if (!ctx)
+		return;
+	
+	PK11_DestroyContext(ctx->pk11_context, free_context);
+#ifndef FRONTEND
+	ResourceOwnerForgetCryptoHash(ctx->resowner, PointerGetDatum(ctx));
+#endif
+	NSS_ShutdownContext(ctx->nss_context);
+	explicit_bzero(ctx, sizeof(pg_cryptohash_ctx));
+	pfree(ctx);
+}
-- 
2.21.1 (Apple Git-122.3)

commit cf6a3e49488b9e795e28713f81f6a4d32702de5d
Author: Jacob Champion <pchampion@vmware.com>
Date:   Tue Jan 19 10:32:27 2021 -0800

    NSS: handle client cert Common Names like be-secure-openssl
    
    Store an unquoted Common Name into port->peer_cn. This is the bulk of
    the patch, because CERT_GetCommonName() always performs RFC 4514
    quoting, and the authentication code in the core expects raw data for
    direct string comparison.
    
    These changes allow us to handle
    - usernames with quotable characters, such as backslashes
    - certificates with other name attributes besides Common Name (country
      code, organizational unit, etc.)
    - certificates without a Common Name
    
    Certificates with embedded NULL bytes in the Common Name will be
    rejected in the same manner as the OpenSSL implementation.

diff --git a/src/backend/libpq/be-secure-nss.c b/src/backend/libpq/be-secure-nss.c
index 111b46dea8..80d7598662 100644
--- a/src/backend/libpq/be-secure-nss.c
+++ b/src/backend/libpq/be-secure-nss.c
@@ -1051,6 +1051,69 @@ pg_bad_cert_handler(void *arg, PRFileDesc * fd)
 	return SECFailure;
 }
 
+/*
+ * Returns the Subject Common Name for the given certificate as a raw char
+ * buffer (that is, without any form of escaping for unprintable characters or
+ * embedded nulls), with the length of the buffer returned in the len parameter.
+ * The buffer is allocated in the TopMemoryContext and is given a NULL
+ * terminator so that callers are safe to call strlen() on it.
+ *
+ * This is used instead of CERT_GetCommonName(), which always performs quoting
+ * and/or escaping. NSS doesn't appear to give us a way to easily unescape the
+ * result, and we need to store the raw CN into port->peer_cn for compatibility
+ * with the OpenSSL implementation.
+ */
+static char *
+raw_subject_common_name(CERTCertificate *cert, unsigned int *len)
+{
+	CERTName	subject = cert->subject;
+	CERTRDN	  **rdn;
+
+	for (rdn = subject.rdns; *rdn; rdn++)
+	{
+		CERTAVA	  **ava;
+
+		for (ava = (*rdn)->avas; *ava; ava++)
+		{
+			SECItem	   *buf;
+			char	   *cn;
+
+			if (CERT_GetAVATag(*ava) != SEC_OID_AVA_COMMON_NAME)
+				continue;
+
+			/* Found a CN. Decode and copy it into a newly allocated buffer. */
+			buf = CERT_DecodeAVAValue(&(*ava)->value);
+			if (!buf)
+			{
+				/*
+				 * This failure case is difficult to test. (Since this code runs
+				 * after certificate authentication has otherwise succeeded,
+				 * you'd need to convince a CA implementation to sign a
+				 * corrupted certificate in order to get here.)
+				 *
+				 * Follow the behavior of CERT_GetCommonName() in this case and
+				 * simply return NULL, as if a Common Name had not been found.
+				 */
+				goto fail;
+			}
+
+			cn = MemoryContextAlloc(TopMemoryContext, buf->len + 1);
+			memcpy(cn, buf->data, buf->len);
+			cn[buf->len] = '\0';
+
+			*len = buf->len;
+
+			SECITEM_FreeItem(buf, PR_TRUE);
+			return cn;
+		}
+	}
+
+fail:
+	/* Not found. */
+	*len = 0;
+	return NULL;
+}
+
 static SECStatus
 pg_cert_auth_handler(void *arg, PRFileDesc * fd, PRBool checksig, PRBool isServer)
 {
@@ -1058,28 +1121,59 @@ pg_cert_auth_handler(void *arg, PRFileDesc * fd, PRBool checksig, PRBool isServe
 	Port	   *port = (Port *) arg;
 	CERTCertificate *cert;
 	char	   *peer_cn;
-	int			len;
+	unsigned int len;
 
 	status = SSL_AuthCertificate(CERT_GetDefaultCertDB(), port->pr_fd, checksig, PR_TRUE);
-	if (status == SECSuccess)
+	if (status != SECSuccess)
+		return status;
+
+	port->peer_cn = NULL;
+	port->peer_cert_valid = false;
+
+	cert = SSL_PeerCertificate(port->pr_fd);
+	if (!cert)
 	{
-		cert = SSL_PeerCertificate(port->pr_fd);
-		len = strlen(cert->subjectName);
-		peer_cn = MemoryContextAllocZero(TopMemoryContext, len + 1);
+		/* Shouldn't be possible; why did we get a client cert callback? */
+		Assert(cert != NULL);
 
-		/*
-		 * Skip over the key= portion of the key=value containing the peer CN.
-		 */
-		if (strncmp(cert->subjectName, "CN=", 3) == 0)
-			strlcpy(peer_cn, cert->subjectName + strlen("CN="), len + 1);
-		else
-			strlcpy(peer_cn, cert->subjectName, len + 1);
-		CERT_DestroyCertificate(cert);
+		PR_SetError(SEC_ERROR_LIBRARY_FAILURE, 0);
+		return SECFailure;
+	}
 
-		port->peer_cn = peer_cn;
+	peer_cn = raw_subject_common_name(cert, &len);
+	if (!peer_cn)
+	{
+		/* No Common Name, but the certificate otherwise checks out. */
 		port->peer_cert_valid = true;
+
+		status = SECSuccess;
+		goto cleanup;
 	}
 
+	/*
+	 * Reject embedded NULLs in certificate common name to prevent attacks like
+	 * CVE-2009-4034.
+	 */
+	if (len != strlen(peer_cn))
+	{
+		ereport(COMMERROR,
+				(errcode(ERRCODE_PROTOCOL_VIOLATION),
+				 errmsg("SSL certificate's common name contains embedded null")));
+
+		pfree(peer_cn);
+		PR_SetError(SEC_ERROR_CERT_NOT_VALID, 0);
+
+		status = SECFailure;
+		goto cleanup;
+	}
+
+	port->peer_cn = peer_cn;
+	port->peer_cert_valid = true;
+
+	status = SECSuccess;
+
+cleanup:
+	CERT_DestroyCertificate(cert);
 	return status;
 }
 

From 29d6390db3dd8d418c2abda24c285f621f1a5917 Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Wed, 28 Oct 2020 11:18:42 +0100
Subject: [PATCH v23 1/6] NSS Frontend, Backend and build infrastructure

TODO:
	* SCRAM channel binding is implemented but doesn't work
	* Frontend CRL configuration handling
	* Settle on a required version in autoconf
	* Move pg_nss.h to a .c file for both frontend and backend

Daniel Gustafsson, Andrew Dunstan, Jacob Champion
---
 configure                                     |  422 ++++-
 configure.ac                                  |   56 +-
 .../postgres_fdw/expected/postgres_fdw.out    |    2 +-
 src/Makefile.global.in                        |    2 +-
 src/backend/libpq/Makefile                    |    6 +-
 src/backend/libpq/auth.c                      |    7 +
 src/backend/libpq/be-secure-nss.c             | 1359 +++++++++++++++++
 src/backend/libpq/be-secure.c                 |    3 +
 src/backend/libpq/hba.c                       |    2 +-
 src/backend/utils/misc/guc.c                  |   20 +-
 src/common/Makefile                           |    2 +-
 src/include/common/pg_nss.h                   |  175 +++
 src/include/libpq/libpq-be.h                  |   15 +-
 src/include/libpq/libpq.h                     |    3 +
 src/include/pg_config.h.in                    |    3 +
 src/include/pg_config_manual.h                |    5 +-
 src/interfaces/libpq/Makefile                 |   13 +-
 src/interfaces/libpq/fe-connect.c             |    4 +
 src/interfaces/libpq/fe-secure-nss.c          | 1112 ++++++++++++++
 src/interfaces/libpq/fe-secure.c              |    5 +-
 src/interfaces/libpq/libpq-fe.h               |   13 +-
 src/interfaces/libpq/libpq-int.h              |   20 +-
 src/tools/msvc/Mkvcbuild.pm                   |   22 +-
 src/tools/msvc/Solution.pm                    |   20 +
 src/tools/msvc/config_default.pl              |    1 +
 25 files changed, 3216 insertions(+), 76 deletions(-)
 create mode 100644 src/backend/libpq/be-secure-nss.c
 create mode 100644 src/include/common/pg_nss.h
 create mode 100644 src/interfaces/libpq/fe-secure-nss.c

diff --git a/configure b/configure
index 8af4b99021..cc6088b545 100755
--- a/configure
+++ b/configure
@@ -653,6 +653,9 @@ LIBOBJS
 UUID_LIBS
 LDAP_LIBS_BE
 LDAP_LIBS_FE
+with_ssl
+NSPR_CONFIG
+NSS_CONFIG
 PTHREAD_CFLAGS
 PTHREAD_LIBS
 PTHREAD_CC
@@ -710,7 +713,6 @@ with_uuid
 with_readline
 with_systemd
 with_selinux
-with_openssl
 with_ldap
 with_krb_srvnam
 krb_srvtab
@@ -798,6 +800,7 @@ infodir
 docdir
 oldincludedir
 includedir
+runstatedir
 localstatedir
 sharedstatedir
 sysconfdir
@@ -855,7 +858,6 @@ with_pam
 with_bsd_auth
 with_ldap
 with_bonjour
-with_openssl
 with_selinux
 with_systemd
 with_readline
@@ -867,6 +869,8 @@ with_libxslt
 with_system_tzdata
 with_zlib
 with_gnu_ld
+with_ssl
+with_openssl
 enable_largefile
 '
       ac_precious_vars='build_alias
@@ -935,6 +939,7 @@ datadir='${datarootdir}'
 sysconfdir='${prefix}/etc'
 sharedstatedir='${prefix}/com'
 localstatedir='${prefix}/var'
+runstatedir='${localstatedir}/run'
 includedir='${prefix}/include'
 oldincludedir='/usr/include'
 docdir='${datarootdir}/doc/${PACKAGE_TARNAME}'
@@ -1187,6 +1192,15 @@ do
   | -silent | --silent | --silen | --sile | --sil)
     silent=yes ;;
 
+  -runstatedir | --runstatedir | --runstatedi | --runstated \
+  | --runstate | --runstat | --runsta | --runst | --runs \
+  | --run | --ru | --r)
+    ac_prev=runstatedir ;;
+  -runstatedir=* | --runstatedir=* | --runstatedi=* | --runstated=* \
+  | --runstate=* | --runstat=* | --runsta=* | --runst=* | --runs=* \
+  | --run=* | --ru=* | --r=*)
+    runstatedir=$ac_optarg ;;
+
   -sbindir | --sbindir | --sbindi | --sbind | --sbin | --sbi | --sb)
     ac_prev=sbindir ;;
   -sbindir=* | --sbindir=* | --sbindi=* | --sbind=* | --sbin=* \
@@ -1324,7 +1338,7 @@ fi
 for ac_var in	exec_prefix prefix bindir sbindir libexecdir datarootdir \
 		datadir sysconfdir sharedstatedir localstatedir includedir \
 		oldincludedir docdir infodir htmldir dvidir pdfdir psdir \
-		libdir localedir mandir
+		libdir localedir mandir runstatedir
 do
   eval ac_val=\$$ac_var
   # Remove trailing slashes.
@@ -1477,6 +1491,7 @@ Fine tuning of the installation directories:
   --sysconfdir=DIR        read-only single-machine data [PREFIX/etc]
   --sharedstatedir=DIR    modifiable architecture-independent data [PREFIX/com]
   --localstatedir=DIR     modifiable single-machine data [PREFIX/var]
+  --runstatedir=DIR       modifiable per-process data [LOCALSTATEDIR/run]
   --libdir=DIR            object code libraries [EPREFIX/lib]
   --includedir=DIR        C header files [PREFIX/include]
   --oldincludedir=DIR     C header files for non-gcc [/usr/include]
@@ -1557,7 +1572,6 @@ Optional Packages:
   --with-bsd-auth         build with BSD Authentication support
   --with-ldap             build with LDAP support
   --with-bonjour          build with Bonjour support
-  --with-openssl          build with OpenSSL support
   --with-selinux          build with SELinux support
   --with-systemd          build with systemd support
   --without-readline      do not use GNU Readline nor BSD Libedit for editing
@@ -1571,6 +1585,8 @@ Optional Packages:
                           use system time zone data in DIR
   --without-zlib          do not use Zlib
   --with-gnu-ld           assume the C compiler uses GNU ld [default=no]
+  --with-ssl=LIB          use LIB for SSL/TLS support (openssl, nss)
+  --with-openssl          obsolete spelling of --with-ssl=openssl
 
 Some influential environment variables:
   CC          C compiler command
@@ -8071,41 +8087,6 @@ fi
 $as_echo "$with_bonjour" >&6; }
 
 
-#
-# OpenSSL
-#
-{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether to build with OpenSSL support" >&5
-$as_echo_n "checking whether to build with OpenSSL support... " >&6; }
-
-
-
-# Check whether --with-openssl was given.
-if test "${with_openssl+set}" = set; then :
-  withval=$with_openssl;
-  case $withval in
-    yes)
-
-$as_echo "#define USE_OPENSSL 1" >>confdefs.h
-
-      ;;
-    no)
-      :
-      ;;
-    *)
-      as_fn_error $? "no argument expected for --with-openssl option" "$LINENO" 5
-      ;;
-  esac
-
-else
-  with_openssl=no
-
-fi
-
-
-{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $with_openssl" >&5
-$as_echo "$with_openssl" >&6; }
-
-
 #
 # SELinux
 #
@@ -12179,7 +12160,64 @@ fi
   fi
 fi
 
+#
+# SSL Library
+#
+# There are currently two supported SSL/TLS libraries, OpenSSL and NSS.
+#
+
+
+
+# Check whether --with-ssl was given.
+if test "${with_ssl+set}" = set; then :
+  withval=$with_ssl;
+  case $withval in
+    yes)
+      as_fn_error $? "argument required for --with-ssl option" "$LINENO" 5
+      ;;
+    no)
+      as_fn_error $? "argument required for --with-ssl option" "$LINENO" 5
+      ;;
+    *)
+
+      ;;
+  esac
+
+fi
+
+
+if test x"$with_ssl" = x"" ; then
+  with_ssl=no
+fi
+
+
+
+# Check whether --with-openssl was given.
+if test "${with_openssl+set}" = set; then :
+  withval=$with_openssl;
+  case $withval in
+    yes)
+      :
+      ;;
+    no)
+      :
+      ;;
+    *)
+      as_fn_error $? "no argument expected for --with-openssl option" "$LINENO" 5
+      ;;
+  esac
+
+else
+  with_openssl=no
+
+fi
+
+
 if test "$with_openssl" = yes ; then
+  with_ssl=openssl
+fi
+
+if test "$with_ssl" = openssl ; then
     # Minimum required OpenSSL version is 1.0.1
 
 $as_echo "#define OPENSSL_API_COMPAT 0x10001000L" >>confdefs.h
@@ -12440,8 +12478,280 @@ _ACEOF
 fi
 done
 
+
+$as_echo "#define USE_OPENSSL 1" >>confdefs.h
+
+elif test "$with_ssl" = nss ; then
+  # TODO: fallback in case nss-config/nspr-config aren't found.
+  if test -z "$NSS_CONFIG"; then
+  for ac_prog in nss-config
+do
+  # Extract the first word of "$ac_prog", so it can be a program name with args.
+set dummy $ac_prog; ac_word=$2
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
+$as_echo_n "checking for $ac_word... " >&6; }
+if ${ac_cv_path_NSS_CONFIG+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  case $NSS_CONFIG in
+  [\\/]* | ?:[\\/]*)
+  ac_cv_path_NSS_CONFIG="$NSS_CONFIG" # Let the user override the test with a path.
+  ;;
+  *)
+  as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH
+do
+  IFS=$as_save_IFS
+  test -z "$as_dir" && as_dir=.
+    for ac_exec_ext in '' $ac_executable_extensions; do
+  if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
+    ac_cv_path_NSS_CONFIG="$as_dir/$ac_word$ac_exec_ext"
+    $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
+    break 2
+  fi
+done
+  done
+IFS=$as_save_IFS
+
+  ;;
+esac
+fi
+NSS_CONFIG=$ac_cv_path_NSS_CONFIG
+if test -n "$NSS_CONFIG"; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $NSS_CONFIG" >&5
+$as_echo "$NSS_CONFIG" >&6; }
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+fi
+
+
+  test -n "$NSS_CONFIG" && break
+done
+
+else
+  # Report the value of NSS_CONFIG in configure's output in all cases.
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for NSS_CONFIG" >&5
+$as_echo_n "checking for NSS_CONFIG... " >&6; }
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $NSS_CONFIG" >&5
+$as_echo "$NSS_CONFIG" >&6; }
+fi
+
+  if test -z "$NSPR_CONFIG"; then
+  for ac_prog in nspr-config
+do
+  # Extract the first word of "$ac_prog", so it can be a program name with args.
+set dummy $ac_prog; ac_word=$2
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
+$as_echo_n "checking for $ac_word... " >&6; }
+if ${ac_cv_path_NSPR_CONFIG+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  case $NSPR_CONFIG in
+  [\\/]* | ?:[\\/]*)
+  ac_cv_path_NSPR_CONFIG="$NSPR_CONFIG" # Let the user override the test with a path.
+  ;;
+  *)
+  as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH
+do
+  IFS=$as_save_IFS
+  test -z "$as_dir" && as_dir=.
+    for ac_exec_ext in '' $ac_executable_extensions; do
+  if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
+    ac_cv_path_NSPR_CONFIG="$as_dir/$ac_word$ac_exec_ext"
+    $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
+    break 2
+  fi
+done
+  done
+IFS=$as_save_IFS
+
+  ;;
+esac
+fi
+NSPR_CONFIG=$ac_cv_path_NSPR_CONFIG
+if test -n "$NSPR_CONFIG"; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $NSPR_CONFIG" >&5
+$as_echo "$NSPR_CONFIG" >&6; }
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+fi
+
+
+  test -n "$NSPR_CONFIG" && break
+done
+
+else
+  # Report the value of NSPR_CONFIG in configure's output in all cases.
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for NSPR_CONFIG" >&5
+$as_echo_n "checking for NSPR_CONFIG... " >&6; }
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $NSPR_CONFIG" >&5
+$as_echo "$NSPR_CONFIG" >&6; }
+fi
+
+  if test -n "$NSS_CONFIG"; then
+    NSS_LIBS=`$NSS_CONFIG --libs`
+	NSS_CFLAGS=`$NSS_CONFIG --cflags`
+  fi
+  if test -n "$NSPR_CONFIG"; then
+	NSPR_LIBS=`$NSPR_CONFIG --libs`
+	NSPR_CFLAGS=`$NSPR_CONFIG --cflags`
+  fi
+
+  LDFLAGS="$LDFLAGS $NSS_LIBS $NSPR_LIBS"
+  CFLAGS="$CFLAGS $NSS_CFLAGS $NSPR_CFLAGS"
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for NSS_InitContext in -lnss3" >&5
+$as_echo_n "checking for NSS_InitContext in -lnss3... " >&6; }
+if ${ac_cv_lib_nss3_NSS_InitContext+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lnss3  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char NSS_InitContext ();
+int
+main ()
+{
+return NSS_InitContext ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_lib_nss3_NSS_InitContext=yes
+else
+  ac_cv_lib_nss3_NSS_InitContext=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_nss3_NSS_InitContext" >&5
+$as_echo "$ac_cv_lib_nss3_NSS_InitContext" >&6; }
+if test "x$ac_cv_lib_nss3_NSS_InitContext" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_LIBNSS3 1
+_ACEOF
+
+  LIBS="-lnss3 $LIBS"
+
+else
+  as_fn_error $? "library 'nss3' is required for NSS" "$LINENO" 5
 fi
 
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for PR_GetDefaultIOMethods in -lnspr4" >&5
+$as_echo_n "checking for PR_GetDefaultIOMethods in -lnspr4... " >&6; }
+if ${ac_cv_lib_nspr4_PR_GetDefaultIOMethods+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lnspr4  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char PR_GetDefaultIOMethods ();
+int
+main ()
+{
+return PR_GetDefaultIOMethods ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_lib_nspr4_PR_GetDefaultIOMethods=yes
+else
+  ac_cv_lib_nspr4_PR_GetDefaultIOMethods=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_nspr4_PR_GetDefaultIOMethods" >&5
+$as_echo "$ac_cv_lib_nspr4_PR_GetDefaultIOMethods" >&6; }
+if test "x$ac_cv_lib_nspr4_PR_GetDefaultIOMethods" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_LIBNSPR4 1
+_ACEOF
+
+  LIBS="-lnspr4 $LIBS"
+
+else
+  as_fn_error $? "library 'nspr4' is required for NSS" "$LINENO" 5
+fi
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for SSL_GetImplementedCiphers in -lssl3" >&5
+$as_echo_n "checking for SSL_GetImplementedCiphers in -lssl3... " >&6; }
+if ${ac_cv_lib_ssl3_SSL_GetImplementedCiphers+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lssl3  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char SSL_GetImplementedCiphers ();
+int
+main ()
+{
+return SSL_GetImplementedCiphers ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_lib_ssl3_SSL_GetImplementedCiphers=yes
+else
+  ac_cv_lib_ssl3_SSL_GetImplementedCiphers=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_ssl3_SSL_GetImplementedCiphers" >&5
+$as_echo "$ac_cv_lib_ssl3_SSL_GetImplementedCiphers" >&6; }
+if test "x$ac_cv_lib_ssl3_SSL_GetImplementedCiphers" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_LIBSSL3 1
+_ACEOF
+
+  LIBS="-lssl3 $LIBS"
+
+else
+  as_fn_error $? "library 'ssl3' is required for NSS" "$LINENO" 5
+fi
+
+
+$as_echo "#define USE_NSS 1" >>confdefs.h
+
+elif test "$with_ssl" != no ; then
+  as_fn_error $? "--with-ssl must specify one of openssl or nss" "$LINENO" 5
+fi
+
+
 if test "$with_pam" = yes ; then
   { $as_echo "$as_me:${as_lineno-$LINENO}: checking for pam_start in -lpam" >&5
 $as_echo_n "checking for pam_start in -lpam... " >&6; }
@@ -13327,7 +13637,7 @@ done
 
 fi
 
-if test "$with_openssl" = yes ; then
+if test "$with_ssl" = openssl ; then
   ac_fn_c_check_header_mongrel "$LINENO" "openssl/ssl.h" "ac_cv_header_openssl_ssl_h" "$ac_includes_default"
 if test "x$ac_cv_header_openssl_ssl_h" = xyes; then :
 
@@ -13344,6 +13654,25 @@ else
 fi
 
 
+fi
+
+if test "$with_ssl" = nss ; then
+  ac_fn_c_check_header_mongrel "$LINENO" "nss/ssl.h" "ac_cv_header_nss_ssl_h" "$ac_includes_default"
+if test "x$ac_cv_header_nss_ssl_h" = xyes; then :
+
+else
+  as_fn_error $? "header file <nss/ssl.h> is required for NSS" "$LINENO" 5
+fi
+
+
+  ac_fn_c_check_header_mongrel "$LINENO" "nss/nss.h" "ac_cv_header_nss_nss_h" "$ac_includes_default"
+if test "x$ac_cv_header_nss_nss_h" = xyes; then :
+
+else
+  as_fn_error $? "header file <nss/nss.h> is required for NSS" "$LINENO" 5
+fi
+
+
 fi
 
 if test "$with_pam" = yes ; then
@@ -14689,7 +15018,7 @@ else
     We can't simply define LARGE_OFF_T to be 9223372036854775807,
     since some C++ compilers masquerading as C compilers
     incorrectly reject 9223372036854775807.  */
-#define LARGE_OFF_T (((off_t) 1 << 62) - 1 + ((off_t) 1 << 62))
+#define LARGE_OFF_T ((((off_t) 1 << 31) << 31) - 1 + (((off_t) 1 << 31) << 31))
   int off_t_is_large[(LARGE_OFF_T % 2147483629 == 721
 		       && LARGE_OFF_T % 2147483647 == 1)
 		      ? 1 : -1];
@@ -14735,7 +15064,7 @@ else
     We can't simply define LARGE_OFF_T to be 9223372036854775807,
     since some C++ compilers masquerading as C compilers
     incorrectly reject 9223372036854775807.  */
-#define LARGE_OFF_T (((off_t) 1 << 62) - 1 + ((off_t) 1 << 62))
+#define LARGE_OFF_T ((((off_t) 1 << 31) << 31) - 1 + (((off_t) 1 << 31) << 31))
   int off_t_is_large[(LARGE_OFF_T % 2147483629 == 721
 		       && LARGE_OFF_T % 2147483647 == 1)
 		      ? 1 : -1];
@@ -14759,7 +15088,7 @@ rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
     We can't simply define LARGE_OFF_T to be 9223372036854775807,
     since some C++ compilers masquerading as C compilers
     incorrectly reject 9223372036854775807.  */
-#define LARGE_OFF_T (((off_t) 1 << 62) - 1 + ((off_t) 1 << 62))
+#define LARGE_OFF_T ((((off_t) 1 << 31) << 31) - 1 + (((off_t) 1 << 31) << 31))
   int off_t_is_large[(LARGE_OFF_T % 2147483629 == 721
 		       && LARGE_OFF_T % 2147483647 == 1)
 		      ? 1 : -1];
@@ -14804,7 +15133,7 @@ else
     We can't simply define LARGE_OFF_T to be 9223372036854775807,
     since some C++ compilers masquerading as C compilers
     incorrectly reject 9223372036854775807.  */
-#define LARGE_OFF_T (((off_t) 1 << 62) - 1 + ((off_t) 1 << 62))
+#define LARGE_OFF_T ((((off_t) 1 << 31) << 31) - 1 + (((off_t) 1 << 31) << 31))
   int off_t_is_large[(LARGE_OFF_T % 2147483629 == 721
 		       && LARGE_OFF_T % 2147483647 == 1)
 		      ? 1 : -1];
@@ -14828,7 +15157,7 @@ rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
     We can't simply define LARGE_OFF_T to be 9223372036854775807,
     since some C++ compilers masquerading as C compilers
     incorrectly reject 9223372036854775807.  */
-#define LARGE_OFF_T (((off_t) 1 << 62) - 1 + ((off_t) 1 << 62))
+#define LARGE_OFF_T ((((off_t) 1 << 31) << 31) - 1 + (((off_t) 1 << 31) << 31))
   int off_t_is_large[(LARGE_OFF_T % 2147483629 == 721
 		       && LARGE_OFF_T % 2147483647 == 1)
 		      ? 1 : -1];
@@ -18106,6 +18435,9 @@ $as_echo_n "checking which random number source to use... " >&6; }
 if test x"$with_openssl" = x"yes" ; then
   { $as_echo "$as_me:${as_lineno-$LINENO}: result: OpenSSL" >&5
 $as_echo "OpenSSL" >&6; }
+elif test x"$with_nss" = x"yes" ; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: NSS" >&5
+$as_echo "NSS" >&6; }
 elif test x"$PORTNAME" = x"win32" ; then
   { $as_echo "$as_me:${as_lineno-$LINENO}: result: Windows native" >&5
 $as_echo "Windows native" >&6; }
diff --git a/configure.ac b/configure.ac
index 868a94c9ba..0da8cc9b0b 100644
--- a/configure.ac
+++ b/configure.ac
@@ -852,15 +852,6 @@ PGAC_ARG_BOOL(with, bonjour, no,
 AC_MSG_RESULT([$with_bonjour])
 
 
-#
-# OpenSSL
-#
-AC_MSG_CHECKING([whether to build with OpenSSL support])
-PGAC_ARG_BOOL(with, openssl, no, [build with OpenSSL support],
-              [AC_DEFINE([USE_OPENSSL], 1, [Define to build with OpenSSL support. (--with-openssl)])])
-AC_MSG_RESULT([$with_openssl])
-AC_SUBST(with_openssl)
-
 #
 # SELinux
 #
@@ -1209,7 +1200,21 @@ if test "$with_gssapi" = yes ; then
   fi
 fi
 
+#
+# SSL Library
+#
+# There are currently two supported SSL/TLS libraries, OpenSSL and NSS.
+#
+PGAC_ARG_REQ(with, ssl, [LIB], [use LIB for SSL/TLS support (openssl, nss)])
+if test x"$with_ssl" = x"" ; then
+  with_ssl=no
+fi
+PGAC_ARG_BOOL(with, openssl, no, [obsolete spelling of --with-ssl=openssl])
 if test "$with_openssl" = yes ; then
+  with_ssl=openssl
+fi
+
+if test "$with_ssl" = openssl ; then
   dnl Order matters!
   # Minimum required OpenSSL version is 1.0.1
   AC_DEFINE(OPENSSL_API_COMPAT, [0x10001000L],
@@ -1233,7 +1238,31 @@ if test "$with_openssl" = yes ; then
   # thread-safety. In 1.1.0, it's no longer required, and CRYPTO_lock()
   # function was removed.
   AC_CHECK_FUNCS([CRYPTO_lock])
+  AC_DEFINE([USE_OPENSSL], 1, [Define to 1 if you have OpenSSL support.])
+elif test "$with_ssl" = nss ; then
+  # TODO: fallback in case nss-config/nspr-config aren't found.
+  PGAC_PATH_PROGS(NSS_CONFIG, nss-config)
+  PGAC_PATH_PROGS(NSPR_CONFIG, nspr-config)
+  if test -n "$NSS_CONFIG"; then
+    NSS_LIBS=`$NSS_CONFIG --libs`
+	NSS_CFLAGS=`$NSS_CONFIG --cflags`
+  fi
+  if test -n "$NSPR_CONFIG"; then
+	NSPR_LIBS=`$NSPR_CONFIG --libs`
+	NSPR_CFLAGS=`$NSPR_CONFIG --cflags`
+  fi
+
+  LDFLAGS="$LDFLAGS $NSS_LIBS $NSPR_LIBS"
+  CFLAGS="$CFLAGS $NSS_CFLAGS $NSPR_CFLAGS"
+
+  AC_CHECK_LIB(nss3, NSS_InitContext, [], [AC_MSG_ERROR([library 'nss3' is required for NSS])])
+  AC_CHECK_LIB(nspr4, PR_GetDefaultIOMethods, [], [AC_MSG_ERROR([library 'nspr4' is required for NSS])])
+  AC_CHECK_LIB(ssl3, SSL_GetImplementedCiphers, [], [AC_MSG_ERROR([library 'ssl3' is required for NSS])])
+  AC_DEFINE([USE_NSS], 1, [Define to 1 if you have NSS support,])
+elif test "$with_ssl" != no ; then
+  AC_MSG_ERROR([--with-ssl must specify one of openssl or nss])
 fi
+AC_SUBST(with_ssl)
 
 if test "$with_pam" = yes ; then
   AC_CHECK_LIB(pam,    pam_start, [], [AC_MSG_ERROR([library 'pam' is required for PAM])])
@@ -1406,11 +1435,16 @@ if test "$with_gssapi" = yes ; then
 	[AC_CHECK_HEADERS(gssapi.h, [], [AC_MSG_ERROR([gssapi.h header file is required for GSSAPI])])])
 fi
 
-if test "$with_openssl" = yes ; then
+if test "$with_ssl" = openssl ; then
   AC_CHECK_HEADER(openssl/ssl.h, [], [AC_MSG_ERROR([header file <openssl/ssl.h> is required for OpenSSL])])
   AC_CHECK_HEADER(openssl/err.h, [], [AC_MSG_ERROR([header file <openssl/err.h> is required for OpenSSL])])
 fi
 
+if test "$with_ssl" = nss ; then
+  AC_CHECK_HEADER(nss/ssl.h, [], [AC_MSG_ERROR([header file <nss/ssl.h> is required for NSS])])
+  AC_CHECK_HEADER(nss/nss.h, [], [AC_MSG_ERROR([header file <nss/nss.h> is required for NSS])])
+fi
+
 if test "$with_pam" = yes ; then
   AC_CHECK_HEADERS(security/pam_appl.h, [],
                    [AC_CHECK_HEADERS(pam/pam_appl.h, [],
@@ -2165,6 +2199,8 @@ fi
 AC_MSG_CHECKING([which random number source to use])
 if test x"$with_openssl" = x"yes" ; then
   AC_MSG_RESULT([OpenSSL])
+elif test x"$with_nss" = x"yes" ; then
+  AC_MSG_RESULT([NSS])
 elif test x"$PORTNAME" = x"win32" ; then
   AC_MSG_RESULT([Windows native])
 else
diff --git a/contrib/postgres_fdw/expected/postgres_fdw.out b/contrib/postgres_fdw/expected/postgres_fdw.out
index 1cad311436..1b0c5ce1fa 100644
--- a/contrib/postgres_fdw/expected/postgres_fdw.out
+++ b/contrib/postgres_fdw/expected/postgres_fdw.out
@@ -8923,7 +8923,7 @@ DO $d$
     END;
 $d$;
 ERROR:  invalid option "password"
-HINT:  Valid options in this context are: service, passfile, channel_binding, connect_timeout, dbname, host, hostaddr, port, options, application_name, keepalives, keepalives_idle, keepalives_interval, keepalives_count, tcp_user_timeout, sslmode, sslcompression, sslcert, sslkey, sslrootcert, sslcrl, requirepeer, ssl_min_protocol_version, ssl_max_protocol_version, gssencmode, krbsrvname, gsslib, target_session_attrs, use_remote_estimate, fdw_startup_cost, fdw_tuple_cost, extensions, updatable, fetch_size
+HINT:  Valid options in this context are: service, passfile, channel_binding, connect_timeout, dbname, host, hostaddr, port, options, application_name, keepalives, keepalives_idle, keepalives_interval, keepalives_count, tcp_user_timeout, sslmode, sslcompression, sslcert, sslkey, sslrootcert, sslcrl, requirepeer, ssl_min_protocol_version, ssl_max_protocol_version, gssencmode, krbsrvname, gsslib, target_session_attrs, cert_database, use_remote_estimate, fdw_startup_cost, fdw_tuple_cost, extensions, updatable, fetch_size
 CONTEXT:  SQL statement "ALTER SERVER loopback_nopw OPTIONS (ADD password 'dummypw')"
 PL/pgSQL function inline_code_block line 3 at EXECUTE
 -- If we add a password for our user mapping instead, we should get a different
diff --git a/src/Makefile.global.in b/src/Makefile.global.in
index 7ca1e9aac5..bdab2a6825 100644
--- a/src/Makefile.global.in
+++ b/src/Makefile.global.in
@@ -183,7 +183,7 @@ with_icu	= @with_icu@
 with_perl	= @with_perl@
 with_python	= @with_python@
 with_tcl	= @with_tcl@
-with_openssl	= @with_openssl@
+with_ssl	= @with_ssl@
 with_readline	= @with_readline@
 with_selinux	= @with_selinux@
 with_systemd	= @with_systemd@
diff --git a/src/backend/libpq/Makefile b/src/backend/libpq/Makefile
index efc5ef760a..045d2c2f6b 100644
--- a/src/backend/libpq/Makefile
+++ b/src/backend/libpq/Makefile
@@ -28,8 +28,12 @@ OBJS = \
 	pqmq.o \
 	pqsignal.o
 
-ifeq ($(with_openssl),yes)
+ifeq ($(with_ssl),openssl)
 OBJS += be-secure-openssl.o
+else
+ifeq ($(with_ssl),nss)
+OBJS += be-secure-nss.o
+endif
 endif
 
 ifeq ($(with_gssapi),yes)
diff --git a/src/backend/libpq/auth.c b/src/backend/libpq/auth.c
index 545635f41a..09ad2ad063 100644
--- a/src/backend/libpq/auth.c
+++ b/src/backend/libpq/auth.c
@@ -2849,7 +2849,14 @@ CheckCertAuth(Port *port)
 {
 	int			status_check_usermap = STATUS_ERROR;
 
+#if defined(USE_OPENSSL)
 	Assert(port->ssl);
+#elif defined(USE_NSS)
+	/* TODO: should we rename pr_fd to ssl, to keep consistency? */
+	Assert(port->pr_fd);
+#else
+	Assert(false);
+#endif
 
 	/* Make sure we have received a username in the certificate */
 	if (port->peer_cn == NULL ||
diff --git a/src/backend/libpq/be-secure-nss.c b/src/backend/libpq/be-secure-nss.c
new file mode 100644
index 0000000000..80d7598662
--- /dev/null
+++ b/src/backend/libpq/be-secure-nss.c
@@ -0,0 +1,1359 @@
+/*-------------------------------------------------------------------------
+ *
+ * be-secure-nss.c
+ *	  functions for supporting NSS as a TLS backend
+ *
+ *
+ * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ *	  src/backend/libpq/be-secure-nss.c
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#include "postgres.h"
+
+#include <sys/stat.h>
+
+/*
+ * BITS_PER_BYTE is also defined in the NSPR header files, so we need to undef
+ * our version to avoid compiler warnings on redefinition.
+ */
+#define pg_BITS_PER_BYTE BITS_PER_BYTE
+#undef BITS_PER_BYTE
+
+/*
+ * The nspr/obsolete/protypes.h NSPR header typedefs uint64 and int64 with
+ * colliding definitions from ours, causing a much expected compiler error.
+ * Remove backwards compatibility with ancient NSPR versions to avoid this.
+ */
+#define NO_NSPR_10_SUPPORT
+#include <nspr/nspr.h>
+#include <nspr/prerror.h>
+#include <nspr/prio.h>
+#include <nspr/prmem.h>
+#include <nspr/prtypes.h>
+
+#include <nss/nss.h>
+#include <nss/base64.h>
+#include <nss/cert.h>
+#include <nss/certdb.h>
+#include <nss/hasht.h>
+#include <nss/keyhi.h>
+#include <nss/pk11pub.h>
+#include <nss/secder.h>
+#include <nss/secerr.h>
+#include <nss/secitem.h>
+#include <nss/secoidt.h>
+#include <nss/secport.h>
+#include <nss/ssl.h>
+#include <nss/sslerr.h>
+#include <nss/sslproto.h>
+
+/*
+ * Ensure that the colliding definitions match, else throw an error. In case
+ * NSPR has removed the definition for some reason, make sure to put ours
+ * back again.
+ */
+#if defined(BITS_PER_BYTE)
+#if BITS_PER_BYTE != pg_BITS_PER_BYTE
+#error "incompatible byte widths between NSPR and postgres"
+#endif
+#else
+#define BITS_PER_BYTE pg_BITS_PER_BYTE
+#endif
+#undef pg_BITS_PER_BYTE
+
+#include "common/pg_nss.h"
+#include "lib/stringinfo.h"
+#include "libpq/libpq.h"
+#include "nodes/pg_list.h"
+#include "miscadmin.h"
+#include "storage/fd.h"
+#include "utils/guc.h"
+#include "utils/memutils.h"
+
+
+/* default init hook can be overridden by a shared library */
+static void default_nss_tls_init(bool isServerStart);
+nss_tls_init_hook_type nss_tls_init_hook = default_nss_tls_init;
+
+static PRDescIdentity pr_id;
+
+static PRIOMethods pr_iomethods;
+static NSSInitContext * nss_context = NULL;
+static SSLVersionRange desired_sslver;
+
+static char *external_ssl_passphrase_cb(PK11SlotInfo *slot, PRBool retry, void *arg);
+static bool dummy_ssl_passwd_cb_called = false;
+static bool ssl_is_server_start;
+
+/*
+ * PR_ImportTCPSocket() is a private API, but very widely used, as it's the
+ * only way to make NSS use an already set up POSIX file descriptor rather
+ * than opening one itself. To quote the NSS documentation:
+ *
+ *		"In theory, code that uses PR_ImportTCPSocket may break when NSPR's
+ *		implementation changes. In practice, this is unlikely to happen because
+ *		NSPR's implementation has been stable for years and because of NSPR's
+ *		strong commitment to backward compatibility."
+ *
+ * https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSPR/Reference/PR_ImportTCPSocket
+ *
+ * The function is declared in <private/pprio.h>, but as it is a header marked
+ * private we declare it here rather than including it.
+ */
+NSPR_API(PRFileDesc *) PR_ImportTCPSocket(int);
+
+/* NSS IO layer callback overrides */
+static PRInt32 pg_ssl_read(PRFileDesc * fd, void *buf, PRInt32 amount,
+						   PRIntn flags, PRIntervalTime timeout);
+static PRInt32 pg_ssl_write(PRFileDesc * fd, const void *buf, PRInt32 amount,
+							PRIntn flags, PRIntervalTime timeout);
+static PRStatus pg_ssl_close(PRFileDesc * fd);
+/* Utility functions */
+static PRFileDesc * init_iolayer(Port *port);
+static uint16 ssl_protocol_version_to_nss(int v, const char *guc_name);
+
+static char *pg_SSLerrmessage(PRErrorCode errcode);
+static char *ssl_protocol_version_to_string(int v);
+static SECStatus pg_cert_auth_handler(void *arg, PRFileDesc * fd,
+									  PRBool checksig, PRBool isServer);
+static SECStatus pg_bad_cert_handler(void *arg, PRFileDesc * fd);
+static char *dummy_ssl_passphrase_cb(PK11SlotInfo * slot, PRBool retry, void *arg);
+
+/* ------------------------------------------------------------ */
+/*						 Public interface						*/
+/* ------------------------------------------------------------ */
+
+/*
+ * be_tls_init
+ *			Initialize the nss TLS library in the postmaster
+ *
+ * The majority of the setup needs to happen in be_tls_open_server since the
+ * NSPR initialization must happen after the forking of the backend. We could
+ * potentially move some parts in under !isServerStart, but so far this is the
+ * separation chosen.
+ */
+int
+be_tls_init(bool isServerStart)
+{
+	SECStatus	status;
+	SSLVersionRange supported_sslver;
+
+	status = SSL_ConfigServerSessionIDCacheWithOpt(0, 0, NULL, 1, 0, 0, PR_FALSE);
+	if (status != SECSuccess)
+	{
+		ereport(isServerStart ? FATAL : LOG,
+				(errmsg("unable to connect to TLS connection cache: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+		return -1;
+	}
+
+	if (!ssl_database || strlen(ssl_database) == 0)
+	{
+		ereport(isServerStart ? FATAL : LOG,
+				(errmsg("no certificate database specified")));
+		return -1;
+	}
+
+	/*
+	 * We check for the desired TLS version range here, even though we cannot
+	 * set it until be_open_server such that we can be compatible with how the
+	 * OpenSSL backend reports errors for incompatible range configurations.
+	 * Set either the default supported TLS version range, or the configured
+	 * range from ssl_min_protocol_version and ssl_max_protocol version. In
+	 * case the user hasn't defined the maximum allowed version we fall back
+	 * to the highest version TLS that the library supports.
+	 */
+	if (SSL_VersionRangeGetSupported(ssl_variant_stream, &supported_sslver) != SECSuccess)
+	{
+		ereport(isServerStart ? FATAL : LOG,
+				(errmsg("unable to get default protocol support from NSS")));
+		return -1;
+	}
+
+	/*
+	 * Set the fallback versions for the TLS protocol version range to a
+	 * combination of our minimal requirement and the library maximum. Error
+	 * messages should be kept identical to those in be-secure-openssl.c to
+	 * make translations easier.
+	 */
+	desired_sslver.min = SSL_LIBRARY_VERSION_TLS_1_0;
+	desired_sslver.max = supported_sslver.max;
+
+	if (ssl_min_protocol_version)
+	{
+		int			ver = ssl_protocol_version_to_nss(ssl_min_protocol_version,
+													  "ssl_min_protocol_version");
+
+		if (ver == -1)
+		{
+			ereport(isServerStart ? FATAL : LOG,
+					(errmsg("\"%s\" setting \"%s\" not supported by this build",
+							"ssl_min_protocol_version",
+							GetConfigOption("ssl_min_protocol_version",
+											false, false))));
+			return -1;
+		}
+
+		if (ver > 0)
+			desired_sslver.min = ver;
+	}
+
+	if (ssl_max_protocol_version)
+	{
+		int			ver = ssl_protocol_version_to_nss(ssl_max_protocol_version,
+													  "ssl_max_protocol_version");
+
+		if (ver == -1)
+		{
+			ereport(isServerStart ? FATAL : LOG,
+					(errmsg("\"%s\" setting \"%s\" not supported by this build",
+							"ssl_max_protocol_version",
+							GetConfigOption("ssl_max_protocol_version",
+											false, false))));
+			return -1;
+		}
+		if (ver > 0)
+			desired_sslver.max = ver;
+
+		if (ver < desired_sslver.min)
+		{
+			ereport(isServerStart ? FATAL : LOG,
+					(errmsg("could not set SSL protocol version range"),
+					 errdetail("\"%s\" cannot be higher than \"%s\"",
+							   "ssl_min_protocol_version",
+							   "ssl_max_protocol_version")));
+			return -1;
+		}
+	}
+
+	/*
+	 * Set the passphrase callback which will be used both to obtain the
+	 * passphrase from the user, as well as by NSS to obtain the phrase
+	 * repeatedly.
+	 */
+	ssl_is_server_start = isServerStart;
+	(*nss_tls_init_hook) (isServerStart);
+
+	return 0;
+}
+
+int
+be_tls_open_server(Port *port)
+{
+	SECStatus	status;
+	PRFileDesc *model;
+	PRFileDesc *pr_fd;
+	PRFileDesc *layer;
+	CERTCertificate *server_cert;
+	SECKEYPrivateKey *private_key;
+	CERTSignedCrl *crl;
+	SECItem		crlname;
+	char	   *cert_database;
+	NSSInitParameters params;
+
+	/*
+	 * The NSPR documentation states that runtime initialization via PR_Init
+	 * is no longer required, as the first caller into NSPR will perform the
+	 * initialization implicitly. The documentation doesn't however clarify
+	 * from which version this is holds true, so let's perform the potentially
+	 * superfluous initialization anyways to avoid crashing on older versions
+	 * of NSPR, as there is no difference in overhead.  The NSS documentation
+	 * still states that PR_Init must be called in some way (implicitly or
+	 * explicitly).
+	 *
+	 * The below parameters are what the implicit initialization would've done
+	 * for us, and should work even for older versions where it might not be
+	 * done automatically. The last parameter, maxPTDs, is set to various
+	 * values in other codebases, but has been unused since NSPR 2.1 which was
+	 * released sometime in 1998. In current versions of NSPR all parameters
+	 * are ignored.
+	 */
+	PR_Init(PR_USER_THREAD, PR_PRIORITY_NORMAL, 0 /* maxPTDs */ );
+
+	/*
+	 * The certificate path (configdir) must contain a valid NSS database. If
+	 * the certificate path isn't a valid directory, NSS will fall back on the
+	 * system certificate database. If the certificate path is a directory but
+	 * is empty then the initialization will fail. On the client side this can
+	 * be allowed for any sslmode but the verify-xxx ones.
+	 * https://bugzilla.redhat.com/show_bug.cgi?id=728562 For the server side
+	 * we won't allow this to fail however, as we require the certificate and
+	 * key to exist.
+	 *
+	 * The original design of NSS was for a single application to use a single
+	 * copy of it, initialized with NSS_Initialize() which isn't returning any
+	 * handle with which to refer to NSS. NSS initialization and shutdown are
+	 * global for the application, so a shutdown in another NSS enabled
+	 * library would cause NSS to be stopped for libpq as well.  The fix has
+	 * been to introduce NSS_InitContext which returns a context handle to
+	 * pass to NSS_ShutdownContext.  NSS_InitContext was introduced in NSS
+	 * 3.12, but the use of it is not very well documented.
+	 * https://bugzilla.redhat.com/show_bug.cgi?id=738456
+	 *
+	 * The InitParameters struct passed can be used to override internal
+	 * values in NSS, but the usage is not documented at all. When using
+	 * NSS_Init initializations, the values are instead set via PK11_Configure
+	 * calls so the PK11_Configure documentation can be used to glean some
+	 * details on these.
+	 *
+	 * https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS/PKCS11/Module_Specs
+	 */
+	memset(&params, '\0', sizeof(params));
+	params.length = sizeof(params);
+
+	if (!ssl_database || strlen(ssl_database) == 0)
+		ereport(FATAL,
+				(errmsg("no certificate database specified")));
+
+	cert_database = psprintf("sql:%s", ssl_database);
+	nss_context = NSS_InitContext(cert_database, "", "", "",
+								  &params,
+								  NSS_INIT_READONLY | NSS_INIT_PK11RELOAD);
+	pfree(cert_database);
+
+	if (!nss_context)
+		ereport(FATAL,
+				(errmsg("unable to read certificate database \"%s\": %s",
+						ssl_database, pg_SSLerrmessage(PR_GetError()))));
+
+	/*
+	 * Import the already opened socket as we don't want to use NSPR functions
+	 * for opening the network socket due to how the PostgreSQL protocol works
+	 * with TLS connections. This function is not part of the NSPR public API,
+	 * see the comment at the top of the file for the rationale of still using
+	 * it.
+	 */
+	pr_fd = PR_ImportTCPSocket(port->sock);
+	if (!pr_fd)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to connect to socket")));
+		return -1;
+	}
+
+	/*
+	 * Most of the documentation available, and implementations of, NSS/NSPR
+	 * use the PR_NewTCPSocket() function here, which has the drawback that it
+	 * can only create IPv4 sockets. Instead use PR_OpenTCPSocket() which
+	 * copes with IPv6 as well.
+	 *
+	 * We use a model filedescriptor here which is a construct in NSPR/NSS in
+	 * order to create a configuration template for sockets which can then be
+	 * applied to new sockets created. This makes more sense in a server which
+	 * accepts multiple connections and want to perform the boilerplate just
+	 * once, but it does provide a nice abstraction here as well in that we
+	 * can error out early without having performed any operation on the real
+	 * socket.
+	 */
+	model = PR_OpenTCPSocket(port->laddr.addr.ss_family);
+	if (!model)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to open socket")));
+		return -1;
+	}
+
+	/*
+	 * Convert the NSPR socket to an SSL socket. Ensuring the success of this
+	 * operation is critical as NSS SSL_* functions may return SECSuccess on
+	 * the socket even though SSL hasn't been enabled, which introduce a risk
+	 * of silent downgrades.
+	 */
+	model = SSL_ImportFD(NULL, model);
+	if (!model)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to enable TLS on socket")));
+		return -1;
+	}
+
+	/*
+	 * Configure basic settings for the connection over the SSL socket in
+	 * order to set it up as a server.
+	 */
+	if (SSL_OptionSet(model, SSL_SECURITY, PR_TRUE) != SECSuccess)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to configure TLS connection")));
+		return -1;
+	}
+
+	if (SSL_OptionSet(model, SSL_HANDSHAKE_AS_SERVER, PR_TRUE) != SECSuccess ||
+		SSL_OptionSet(model, SSL_HANDSHAKE_AS_CLIENT, PR_FALSE) != SECSuccess)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to configure TLS connection as server")));
+		return -1;
+	}
+
+	/*
+	 * SSLv2 is disabled by default, and SSLv3 will be excluded from the range
+	 * of allowed protocols further down. Since we really don't want these to
+	 * ever be enabled, let's use belts and suspenders and explicitly turn
+	 * them off as well.
+	 */
+	SSL_OptionSet(model, SSL_ENABLE_SSL2, PR_FALSE);
+	SSL_OptionSet(model, SSL_ENABLE_SSL3, PR_FALSE);
+
+#ifdef SSL_CBC_RANDOM_IV
+
+	/*
+	 * Enable protection against the BEAST attack in case the NSS server has
+	 * support for that. While SSLv3 is disabled, we may still allow TLSv1
+	 * which is affected. The option isn't documented as an SSL option, but as
+	 * an NSS environment variable.
+	 */
+	SSL_OptionSet(model, SSL_CBC_RANDOM_IV, PR_TRUE);
+#endif
+
+	/*
+	 * Configure the allowed ciphers. If there are no user preferred suites,
+	 * set the domestic policy.
+	 *
+	 * Historically there were different cipher policies based on export (and
+	 * import) restrictions: Domestic, Export and France. These are since long
+	 * removed with all ciphers being enabled by default. Due to backwards
+	 * compatibility, the old API is still used even though all three policies
+	 * now do the same thing.
+	 *
+	 * If SSLCipherSuites define a policy of the user, we set that rather than
+	 * enabling all ciphers via NSS_SetDomesticPolicy.
+	 *
+	 * TODO: while this code works, the set of ciphers which can be set and
+	 * still end up with a working socket is woefully underdocumented for
+	 * anything more recent than SSLv3 (the code for TLS actually calls ssl3
+	 * functions under the hood for SSL_CipherPrefSet), so it's unclear if
+	 * this is helpful or not. Using the policies works, but may be too
+	 * coarsely grained.
+	 *
+	 * Another TODO: The SSL_ImplementedCiphers table returned with calling
+	 * SSL_GetImplementedCiphers is sorted in server preference order. Sorting
+	 * SSLCipherSuites according to the order of the ciphers therein could be
+	 * a way to implement ssl_prefer_server_ciphers - if we at all want to use
+	 * cipher selection for NSS like how we do it for OpenSSL that is.
+	 */
+
+	/*
+	 * If no ciphers are specified, enable them all.
+	 */
+	if (!SSLCipherSuites || strlen(SSLCipherSuites) == 0)
+	{
+		status = NSS_SetDomesticPolicy();
+		if (status != SECSuccess)
+		{
+			ereport(COMMERROR,
+					(errmsg("unable to set cipher policy: %s",
+							pg_SSLerrmessage(PR_GetError()))));
+			return -1;
+		}
+	}
+	else
+	{
+		char	   *ciphers,
+				   *c;
+
+		char	   *sep = ":;, ";
+		PRUint16	ciphercode;
+		const		PRUint16 *nss_ciphers;
+
+		/*
+		 * If the user has specified a set of preferred cipher suites we start
+		 * by turning off all the existing suites to avoid the risk of down-
+		 * grades to a weaker cipher than expected.
+		 */
+		nss_ciphers = SSL_GetImplementedCiphers();
+		for (int i = 0; i < SSL_GetNumImplementedCiphers(); i++)
+			SSL_CipherPrefSet(model, nss_ciphers[i], PR_FALSE);
+
+		ciphers = pstrdup(SSLCipherSuites);
+
+		for (c = strtok(ciphers, sep); c; c = strtok(NULL, sep))
+		{
+			ciphercode = pg_find_cipher(c);
+			if (ciphercode != INVALID_CIPHER)
+			{
+				status = SSL_CipherPrefSet(model, ciphercode, PR_TRUE);
+				if (status != SECSuccess)
+				{
+					ereport(COMMERROR,
+							(errmsg("invalid cipher-suite specified: %s", c)));
+					return -1;
+				}
+			}
+		}
+
+		pfree(ciphers);
+	}
+
+	if (SSL_VersionRangeSet(model, &desired_sslver) != SECSuccess)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to set requested SSL protocol version range")));
+		return -1;
+	}
+
+	/*
+	 * Set up the custom IO layer.
+	 */
+	layer = init_iolayer(port);
+	if (!layer)
+		return -1;
+
+	if (PR_PushIOLayer(pr_fd, PR_TOP_IO_LAYER, layer) != PR_SUCCESS)
+	{
+		PR_Close(layer);
+		ereport(COMMERROR,
+				(errmsg("unable to push IO layer")));
+		return -1;
+	}
+
+	server_cert = PK11_FindCertFromNickname(ssl_cert_file, (void *) port);
+	if (!server_cert)
+	{
+		if (dummy_ssl_passwd_cb_called)
+		{
+			ereport(COMMERROR,
+					(errmsg("unable to load certificate for \"%s\": %s",
+							ssl_cert_file, pg_SSLerrmessage(PR_GetError())),
+					 errhint("The certificate requires a password.")));
+			return -1;
+		}
+		else
+		{
+			ereport(COMMERROR,
+					(errmsg("unable to find certificate for \"%s\": %s",
+							ssl_cert_file, pg_SSLerrmessage(PR_GetError()))));
+			return -1;
+		}
+	}
+
+	private_key = PK11_FindKeyByAnyCert(server_cert, (void *) port);
+	if (!private_key)
+	{
+		if (dummy_ssl_passwd_cb_called)
+		{
+			ereport(COMMERROR,
+					(errmsg("unable to load private key for \"%s\": %s",
+							ssl_cert_file, pg_SSLerrmessage(PR_GetError())),
+					 errhint("The private key requires a password.")));
+			return -1;
+		}
+		else
+		{
+			ereport(COMMERROR,
+					(errmsg("unable to find private key for \"%s\": %s",
+							ssl_cert_file, pg_SSLerrmessage(PR_GetError()))));
+			return -1;
+		}
+	}
+
+	/*
+	 * NSS doesn't use CRL files on disk, so we use the ssl_crl_file guc to
+	 * contain the CRL nickname for the current server certificate in the NSS
+	 * certificate database. The main difference from the OpenSSL backend is
+	 * that NSS will use the CRL regardless, but being able to make sure the
+	 * CRL is loaded seems like a good feature.
+	 */
+	if (ssl_crl_file[0])
+	{
+		SECITEM_CopyItem(NULL, &crlname, &server_cert->derSubject);
+		crl = SEC_FindCrlByName(CERT_GetDefaultCertDB(), &crlname, SEC_CRL_TYPE);
+		if (!crl)
+		{
+			ereport(COMMERROR,
+					(errmsg("specified CRL not found in database")));
+			return -1;
+		}
+		SEC_DestroyCrl(crl);
+	}
+
+	/*
+	 * Finally we must configure the socket for being a server by setting the
+	 * certificate and key. The NULL parameter is an SSLExtraServerCertData
+	 * pointer with the final parameter being the size of the extra server
+	 * cert data structure pointed to. This is typically only used for
+	 * credential delegation.
+	 */
+	status = SSL_ConfigServerCert(model, server_cert, private_key, NULL, 0);
+	if (status != SECSuccess)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to configure server for TLS server connections: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+		return -1;
+	}
+
+	ssl_loaded_verify_locations = true;
+
+	/*
+	 * At this point, we no longer have use for the certificate and private
+	 * key as they have been copied into the context by NSS. Destroy our
+	 * copies explicitly to clean out the memory as best we can.
+	 */
+	CERT_DestroyCertificate(server_cert);
+	SECKEY_DestroyPrivateKey(private_key);
+
+	status = SSL_AuthCertificateHook(model, pg_cert_auth_handler, (void *) port);
+	if (status != SECSuccess)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to install authcert hook: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+		return -1;
+	}
+	SSL_BadCertHook(model, pg_bad_cert_handler, (void *) port);
+	SSL_OptionSet(model, SSL_REQUEST_CERTIFICATE, PR_TRUE);
+	SSL_OptionSet(model, SSL_REQUIRE_CERTIFICATE, PR_FALSE);
+
+	port->pr_fd = SSL_ImportFD(model, pr_fd);
+	if (!port->pr_fd)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to initialize")));
+		return -1;
+	}
+
+	PR_Close(model);
+
+	/*
+	 * Force a handshake on the next I/O request, the second parameter means
+	 * that we are a server, PR_FALSE would indicate being a client. NSPR
+	 * requires us to call SSL_ResetHandshake since we imported an already
+	 * established socket.
+	 */
+	status = SSL_ResetHandshake(port->pr_fd, PR_TRUE);
+	if (status != SECSuccess)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to initiate handshake: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+		return -1;
+	}
+	status = SSL_ForceHandshake(port->pr_fd);
+	if (status != SECSuccess)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to handshake: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+		return -1;
+	}
+
+	port->ssl_in_use = true;
+	return 0;
+}
+
+ssize_t
+be_tls_read(Port *port, void *ptr, size_t len, int *waitfor)
+{
+	ssize_t		n_read;
+	PRErrorCode err;
+
+	n_read = PR_Read(port->pr_fd, ptr, len);
+
+	if (n_read < 0)
+	{
+		err = PR_GetError();
+
+		if (err == PR_WOULD_BLOCK_ERROR)
+		{
+			*waitfor = WL_SOCKET_READABLE;
+			errno = EWOULDBLOCK;
+		}
+		else
+			errno = ECONNRESET;
+	}
+
+	return n_read;
+}
+
+ssize_t
+be_tls_write(Port *port, void *ptr, size_t len, int *waitfor)
+{
+	ssize_t		n_write;
+	PRErrorCode err;
+	PRIntn		flags = 0;
+
+	/*
+	 * The flags parameter to PR_Send is no longer used and is, according to
+	 * the documentation, required to be zero.
+	 */
+	n_write = PR_Send(port->pr_fd, ptr, len, flags, PR_INTERVAL_NO_WAIT);
+
+	if (n_write < 0)
+	{
+		err = PR_GetError();
+
+		if (err == PR_WOULD_BLOCK_ERROR)
+		{
+			*waitfor = WL_SOCKET_WRITEABLE;
+			errno = EWOULDBLOCK;
+		}
+		else
+			errno = ECONNRESET;
+	}
+
+	return n_write;
+}
+
+void
+be_tls_close(Port *port)
+{
+	if (!port)
+		return;
+
+	if (port->peer_cn)
+	{
+		SSL_InvalidateSession(port->pr_fd);
+		pfree(port->peer_cn);
+		port->peer_cn = NULL;
+	}
+
+	PR_Close(port->pr_fd);
+	port->pr_fd = NULL;
+	port->ssl_in_use = false;
+
+	if (nss_context)
+	{
+		NSS_ShutdownContext(nss_context);
+		nss_context = NULL;
+	}
+}
+
+void
+be_tls_destroy(void)
+{
+	/*
+	 * It reads a bit odd to clear a session cache when we are destroying the
+	 * context altogether, but if the session cache isn't cleared before
+	 * shutting down the context it will fail with SEC_ERROR_BUSY.
+	 */
+	SSL_ClearSessionCache();
+}
+
+int
+be_tls_get_cipher_bits(Port *port)
+{
+	SECStatus	status;
+	SSLChannelInfo channel;
+	SSLCipherSuiteInfo suite;
+
+	status = SSL_GetChannelInfo(port->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+		goto error;
+
+	status = SSL_GetCipherSuiteInfo(channel.cipherSuite, &suite, sizeof(suite));
+	if (status != SECSuccess)
+		goto error;
+
+	return suite.effectiveKeyBits;
+
+error:
+	ereport(WARNING,
+			(errmsg("unable to extract TLS session information: %s",
+					pg_SSLerrmessage(PR_GetError()))));
+	return 0;
+}
+
+/*
+ * be_tls_get_compression
+ *
+ * NSS disabled support for TLS compression in version 3.33 and removed the
+ * code in a subsequent release. The API for retrieving information about
+ * compression as well as enabling it is kept for backwards compatibility, but
+ * we don't need to consult it since it was only available for SSLv3 which we
+ * don't support.
+ *
+ * https://bugzilla.mozilla.org/show_bug.cgi?id=1409587
+ */
+bool
+be_tls_get_compression(Port *port)
+{
+	return false;
+}
+
+/*
+ * be_tls_get_version
+ *
+ * Returns the protocol version used for the current connection, or NULL in
+ * case of errors.
+ */
+const char *
+be_tls_get_version(Port *port)
+{
+	SECStatus	status;
+	SSLChannelInfo channel;
+
+	status = SSL_GetChannelInfo(port->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+	{
+		ereport(WARNING,
+				(errmsg("unable to extract TLS session information: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+		return NULL;
+	}
+
+	return ssl_protocol_version_to_string(channel.protocolVersion);
+}
+
+const char *
+be_tls_get_cipher(Port *port)
+{
+	SECStatus	status;
+	SSLChannelInfo channel;
+	SSLCipherSuiteInfo suite;
+
+	status = SSL_GetChannelInfo(port->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+		goto error;
+
+	status = SSL_GetCipherSuiteInfo(channel.cipherSuite, &suite, sizeof(suite));
+	if (status != SECSuccess)
+		goto error;
+
+	return suite.cipherSuiteName;
+
+error:
+	ereport(WARNING,
+			(errmsg("unable to extract TLS session information: %s",
+					pg_SSLerrmessage(PR_GetError()))));
+	return NULL;
+}
+
+void
+be_tls_get_peer_subject_name(Port *port, char *ptr, size_t len)
+{
+	CERTCertificate *certificate;
+
+	certificate = SSL_PeerCertificate(port->pr_fd);
+	if (certificate)
+		strlcpy(ptr, CERT_NameToAscii(&certificate->subject), len);
+	else
+		ptr[0] = '\0';
+}
+
+void
+be_tls_get_peer_issuer_name(Port *port, char *ptr, size_t len)
+{
+	CERTCertificate *certificate;
+
+	certificate = SSL_PeerCertificate(port->pr_fd);
+	if (certificate)
+		strlcpy(ptr, CERT_NameToAscii(&certificate->issuer), len);
+	else
+		ptr[0] = '\0';
+}
+
+void
+be_tls_get_peer_serial(Port *port, char *ptr, size_t len)
+{
+	CERTCertificate *certificate;
+
+	certificate = SSL_PeerCertificate(port->pr_fd);
+	if (certificate)
+		snprintf(ptr, len, "%li", DER_GetInteger(&(certificate->serialNumber)));
+	else
+		ptr[0] = '\0';
+}
+
+char *
+be_tls_get_certificate_hash(Port *port, size_t *len)
+{
+	CERTCertificate *certificate;
+	SECOidTag	signature_alg;
+	SECOidTag	digest_alg;
+	int			digest_len;
+	const NSSSignatureAlgorithms *candidate;
+	SECStatus	status;
+	PLArenaPool *arena = NULL;
+	SECItem		digest;
+	char	   *ret;
+
+	*len = 0;
+	certificate = SSL_LocalCertificate(port->pr_fd);
+	if (!certificate)
+		return NULL;
+
+	signature_alg = SECOID_GetAlgorithmTag(&certificate->signature);
+
+	candidate = NSS_SCRAMDigestAlgorithm;
+	while (candidate->signature)
+	{
+		if (signature_alg == candidate->signature)
+		{
+			digest_alg = candidate->hash;
+			digest_len = candidate->len;
+			break;
+		}
+
+		candidate++;
+	}
+
+	if (!candidate->signature)
+		elog(ERROR, "could not find digest for OID '%s'",
+			 SECOID_FindOIDTagDescription(signature_alg));
+
+	arena = PORT_NewArena(SEC_ASN1_DEFAULT_ARENA_SIZE);
+	digest.data = PORT_ArenaZAlloc(arena, sizeof(unsigned char) * digest_len);
+	digest.len = digest_len;
+
+	status = PK11_HashBuf(digest_alg, digest.data,
+						  certificate->derCert.data,
+						  certificate->derCert.len);
+
+	if (status != SECSuccess)
+	{
+		PORT_FreeArena(arena, PR_TRUE);
+		return NULL;
+	}
+
+	ret = palloc(digest.len);
+	memcpy(ret, digest.data, digest.len);
+	*len = digest_len;
+	PORT_FreeArena(arena, PR_TRUE);
+
+	return ret;
+}
+
+/* ------------------------------------------------------------ */
+/*						Internal functions						*/
+/* ------------------------------------------------------------ */
+
+/*
+ * default_nss_tls_init
+ *
+ * The default TLS init hook function which users can override for installing
+ * their own passphrase callbacks and similar actions. In case no callback has
+ * been configured, or the callback isn't reload capable during a server
+ * reload, the dummy callback will be installed.
+ *
+ * The private data for the callback is set differently depending on how it's
+ * invoked. For calls which may invoke the callback deeper in the callstack
+ * the private data is set with SSL_SetPKCS11PinArg. When the call is directly
+ * invoking the callback, like PK11_FindCertFromNickname, then the private
+ * data is passed as a parameter. Setting the data with SSL_SetPKCS11PinArg is
+ * thus not required but good practice.
+ *
+ * NSS doesn't provide a default callback like OpenSSL does, but a callback is
+ * required to be set.  The password callback can be installed at any time, but
+ * setting the private data with SSL_SetPKCS11PinArg requires a PR Filedesc.
+ */
+static void
+default_nss_tls_init(bool isServerStart)
+{
+	/*
+	 * No user-defined callback has been configured, install the dummy call-
+	 * back since we must set something.
+	 */
+	if (!ssl_passphrase_command[0])
+		PK11_SetPasswordFunc(dummy_ssl_passphrase_cb);
+	else
+	{
+		/*
+		 * There is a user-defined callback, set it unless we are in a restart
+		 * and cannot handle restarts due to an interactive callback.
+		 */
+		if (isServerStart)
+			PK11_SetPasswordFunc(external_ssl_passphrase_cb);
+		else
+		{
+			if (ssl_passphrase_command_supports_reload)
+				PK11_SetPasswordFunc(external_ssl_passphrase_cb);
+			else
+				PK11_SetPasswordFunc(dummy_ssl_passphrase_cb);
+		}
+	}
+}
+
+/*
+ * external_ssl_passphrase_cb
+ *
+ * Runs the callback configured by ssl_passphrase_command and returns the
+ * captured password back to NSS.
+ */
+static char *
+external_ssl_passphrase_cb(PK11SlotInfo *slot, PRBool retry, void *arg)
+{
+	/*
+	 * NSS use a hardcoded 256 byte buffer for reading the password so set the
+	 * same limit for our callback buffer.
+	 */
+	char		buf[256];
+	int			len;
+	char	   *password = NULL;
+	char	   *prompt;
+
+	/*
+	 * Since there is no password callback in NSS when the server starts up,
+	 * it makes little sense to create an interactive callback. Thus, if this
+	 * is a retry attempt then give up immediately.
+	 */
+	if (retry)
+		return NULL;
+
+	/*
+	 * Construct the same prompt that NSS uses internally even though it is
+	 * unlikely to serve much purpose, but we must set a prompt so we might as
+	 * well do it right.
+	 */
+	prompt = psprintf("Enter Password or Pin for \"%s\":",
+					  PK11_GetTokenName(slot));
+
+	len = run_ssl_passphrase_command(prompt, ssl_is_server_start, buf, sizeof(buf));
+	pfree(prompt);
+
+	if (!len)
+		return NULL;
+
+	/*
+	 * At least one byte with password content was returned, and NSS requires
+	 * that we return it allocated in NSS controlled memory. If we fail to
+	 * allocate then abort without passing back NULL and bubble up the error
+	 * on the PG side.
+	 */
+	password = (char *) PR_Malloc(len + 1);
+	if (!password)
+	{
+		explicit_bzero(buf, sizeof(buf));
+		ereport(ERROR,
+				(errcode(ERRCODE_OUT_OF_MEMORY),
+				 errmsg("out of memory")));
+	}
+	strlcpy(password, buf, sizeof(password));
+	explicit_bzero(buf, sizeof(buf));
+
+	return password;
+}
+
+/*
+ * dummy_ssl_passphrase_cb
+ *
+ * Return unsuccessful if we are asked to provide the passphrase for a cert or
+ * key, without having a passphrase callback installed.
+ */
+static char *
+dummy_ssl_passphrase_cb(PK11SlotInfo *slot, PRBool retry, void *arg)
+{
+	dummy_ssl_passwd_cb_called = true;
+	return NULL;
+}
+
+static SECStatus
+pg_bad_cert_handler(void *arg, PRFileDesc * fd)
+{
+	Port	   *port = (Port *) arg;
+
+	port->peer_cert_valid = false;
+	return SECFailure;
+}
+
+/*
+ * Returns the Subject Common Name for the given certificate as a raw char
+ * buffer (that is, without any form of escaping for unprintable characters or
+ * embedded nulls), with the length of the buffer returned in the len parameter.
+ * The buffer is allocated in the TopMemoryContext and is given a NULL
+ * terminator so that callers are safe to call strlen() on it.
+ *
+ * This is used instead of CERT_GetCommonName(), which always performs quoting
+ * and/or escaping. NSS doesn't appear to give us a way to easily unescape the
+ * result, and we need to store the raw CN into port->peer_cn for compatibility
+ * with the OpenSSL implementation.
+ */
+static char *
+raw_subject_common_name(CERTCertificate *cert, unsigned int *len)
+{
+	CERTName	subject = cert->subject;
+	CERTRDN	  **rdn;
+
+	for (rdn = subject.rdns; *rdn; rdn++)
+	{
+		CERTAVA	  **ava;
+
+		for (ava = (*rdn)->avas; *ava; ava++)
+		{
+			SECItem	   *buf;
+			char	   *cn;
+
+			if (CERT_GetAVATag(*ava) != SEC_OID_AVA_COMMON_NAME)
+				continue;
+
+			/* Found a CN. Decode and copy it into a newly allocated buffer. */
+			buf = CERT_DecodeAVAValue(&(*ava)->value);
+			if (!buf)
+			{
+				/*
+				 * This failure case is difficult to test. (Since this code runs
+				 * after certificate authentication has otherwise succeeded,
+				 * you'd need to convince a CA implementation to sign a
+				 * corrupted certificate in order to get here.)
+				 *
+				 * Follow the behavior of CERT_GetCommonName() in this case and
+				 * simply return NULL, as if a Common Name had not been found.
+				 */
+				goto fail;
+			}
+
+			cn = MemoryContextAlloc(TopMemoryContext, buf->len + 1);
+			memcpy(cn, buf->data, buf->len);
+			cn[buf->len] = '\0';
+
+			*len = buf->len;
+
+			SECITEM_FreeItem(buf, PR_TRUE);
+			return cn;
+		}
+	}
+
+fail:
+	/* Not found. */
+	*len = 0;
+	return NULL;
+}
+
+static SECStatus
+pg_cert_auth_handler(void *arg, PRFileDesc * fd, PRBool checksig, PRBool isServer)
+{
+	SECStatus	status;
+	Port	   *port = (Port *) arg;
+	CERTCertificate *cert;
+	char	   *peer_cn;
+	unsigned int len;
+
+	status = SSL_AuthCertificate(CERT_GetDefaultCertDB(), port->pr_fd, checksig, PR_TRUE);
+	if (status != SECSuccess)
+		return status;
+
+	port->peer_cn = NULL;
+	port->peer_cert_valid = false;
+
+	cert = SSL_PeerCertificate(port->pr_fd);
+	if (!cert)
+	{
+		/* Shouldn't be possible; why did we get a client cert callback? */
+		Assert(cert != NULL);
+
+		PR_SetError(SEC_ERROR_LIBRARY_FAILURE, 0);
+		return SECFailure;
+	}
+
+	peer_cn = raw_subject_common_name(cert, &len);
+	if (!peer_cn)
+	{
+		/* No Common Name, but the certificate otherwise checks out. */
+		port->peer_cert_valid = true;
+
+		status = SECSuccess;
+		goto cleanup;
+	}
+
+	/*
+	 * Reject embedded NULLs in certificate common name to prevent attacks like
+	 * CVE-2009-4034.
+	 */
+	if (len != strlen(peer_cn))
+	{
+		ereport(COMMERROR,
+				(errcode(ERRCODE_PROTOCOL_VIOLATION),
+				 errmsg("SSL certificate's common name contains embedded null")));
+
+		pfree(peer_cn);
+		PR_SetError(SEC_ERROR_CERT_NOT_VALID, 0);
+
+		status = SECFailure;
+		goto cleanup;
+	}
+
+	port->peer_cn = peer_cn;
+	port->peer_cert_valid = true;
+
+	status = SECSuccess;
+
+cleanup:
+	CERT_DestroyCertificate(cert);
+	return status;
+}
+
+static PRInt32
+pg_ssl_read(PRFileDesc *fd, void *buf, PRInt32 amount, PRIntn flags,
+			PRIntervalTime timeout)
+{
+	PRRecvFN	read_fn;
+	PRInt32		n_read;
+
+	read_fn = fd->lower->methods->recv;
+	n_read = read_fn(fd->lower, buf, amount, flags, timeout);
+
+	return n_read;
+}
+
+static PRInt32
+pg_ssl_write(PRFileDesc *fd, const void *buf, PRInt32 amount, PRIntn flags,
+			 PRIntervalTime timeout)
+{
+	PRSendFN	send_fn;
+	PRInt32		n_write;
+
+	send_fn = fd->lower->methods->send;
+	n_write = send_fn(fd->lower, buf, amount, flags, timeout);
+
+	return n_write;
+}
+
+static PRStatus
+pg_ssl_close(PRFileDesc *fd)
+{
+	/*
+	 * Disconnect our private Port from the fd before closing out the stack.
+	 * (Debug builds of NSPR will assert if we do not.)
+	 */
+	fd->secret = NULL;
+	return PR_GetDefaultIOMethods()->close(fd);
+}
+
+static PRFileDesc *
+init_iolayer(Port *port)
+{
+	const		PRIOMethods *default_methods;
+	PRFileDesc *layer;
+
+	/*
+	 * Start by initializing our layer with all the default methods so that we
+	 * can selectively override the ones we want while still ensuring that we
+	 * have a complete layer specification.
+	 */
+	default_methods = PR_GetDefaultIOMethods();
+	memcpy(&pr_iomethods, default_methods, sizeof(PRIOMethods));
+
+	pr_iomethods.recv = pg_ssl_read;
+	pr_iomethods.send = pg_ssl_write;
+	pr_iomethods.close = pg_ssl_close;
+
+	/*
+	 * Each IO layer must be identified by a unique name, where uniqueness is
+	 * per connection. Each connection in a postgres cluster can generate the
+	 * identity from the same string as they will create their IO layers on
+	 * different sockets. Only one layer per socket can have the same name.
+	 */
+	pr_id = PR_GetUniqueIdentity("PostgreSQL Server");
+	if (pr_id == PR_INVALID_IO_LAYER)
+	{
+		ereport(ERROR,
+				(errmsg("out of memory when setting up TLS connection")));
+		return NULL;
+	}
+
+	/*
+	 * Create the actual IO layer as a stub such that it can be pushed onto
+	 * the layer stack. The step via a stub is required as we define custom
+	 * callbacks.
+	 */
+	layer = PR_CreateIOLayerStub(pr_id, &pr_iomethods);
+	if (!layer)
+	{
+		ereport(ERROR,
+				(errmsg("unable to create NSS I/O layer")));
+		return NULL;
+	}
+
+	/* Store the Port as private data available in callbacks */
+	layer->secret = (void *) port;
+
+	return layer;
+}
+
+static char *
+ssl_protocol_version_to_string(int v)
+{
+	switch (v)
+	{
+			/* SSL v2 and v3 are not supported */
+		case SSL_LIBRARY_VERSION_2:
+		case SSL_LIBRARY_VERSION_3_0:
+			Assert(false);
+			break;
+
+		case SSL_LIBRARY_VERSION_TLS_1_0:
+			return pstrdup("TLSv1.0");
+		case SSL_LIBRARY_VERSION_TLS_1_1:
+			return pstrdup("TLSv1.1");
+		case SSL_LIBRARY_VERSION_TLS_1_2:
+			return pstrdup("TLSv1.2");
+		case SSL_LIBRARY_VERSION_TLS_1_3:
+			return pstrdup("TLSv1.3");
+	}
+
+	return pstrdup("unknown");
+}
+
+
+/*
+ * ssl_protocol_version_to_nss
+ *			Translate PostgreSQL TLS version to NSS version
+ *
+ * Returns zero in case the requested TLS version is undefined (PG_ANY) and
+ * should be set by the caller, or -1 on failure.
+ */
+static uint16
+ssl_protocol_version_to_nss(int v, const char *guc_name)
+{
+	switch (v)
+	{
+			/*
+			 * There is no SSL_LIBRARY_ macro defined in NSS with the value
+			 * zero, so we use this to signal the caller that the highest
+			 * useful version should be set on the connection.
+			 */
+		case PG_TLS_ANY:
+			return 0;
+
+			/*
+			 * No guard is required here as there are no versions of NSS
+			 * without support for TLS1.
+			 */
+		case PG_TLS1_VERSION:
+			return SSL_LIBRARY_VERSION_TLS_1_0;
+		case PG_TLS1_1_VERSION:
+#ifdef SSL_LIBRARY_VERSION_TLS_1_1
+			return SSL_LIBRARY_VERSION_TLS_1_1;
+#else
+			break;
+#endif
+		case PG_TLS1_2_VERSION:
+#ifdef SSL_LIBRARY_VERSION_TLS_1_2
+			return SSL_LIBRARY_VERSION_TLS_1_2;
+#else
+			break;
+#endif
+		case PG_TLS1_3_VERSION:
+#ifdef SSL_LIBRARY_VERSION_TLS_1_3
+			return SSL_LIBRARY_VERSION_TLS_1_3;
+#else
+			break;
+#endif
+		default:
+			break;
+	}
+
+	return -1;
+}
+
+/*
+ * pg_SSLerrmessage
+ *		Create and return a human readable error message given
+ *		the specified error code
+ *
+ * PR_ErrorToName only converts the enum identifier of the error to string,
+ * but that can be quite useful for debugging (and in case PR_ErrorToString is
+ * unable to render a message then we at least have something).
+ */
+static char *
+pg_SSLerrmessage(PRErrorCode errcode)
+{
+	return psprintf("%s (%s)",
+					PR_ErrorToString(errcode, PR_LANGUAGE_I_DEFAULT),
+					PR_ErrorToName(errcode));
+}
diff --git a/src/backend/libpq/be-secure.c b/src/backend/libpq/be-secure.c
index 4cf139a223..5e0c27c134 100644
--- a/src/backend/libpq/be-secure.c
+++ b/src/backend/libpq/be-secure.c
@@ -49,6 +49,9 @@ bool		ssl_passphrase_command_supports_reload;
 #ifdef USE_SSL
 bool		ssl_loaded_verify_locations = false;
 #endif
+#ifdef USE_NSS
+char	   *ssl_database;
+#endif
 
 /* GUC variable controlling SSL cipher list */
 char	   *SSLCipherSuites = NULL;
diff --git a/src/backend/libpq/hba.c b/src/backend/libpq/hba.c
index 371dccb852..12b105bbd1 100644
--- a/src/backend/libpq/hba.c
+++ b/src/backend/libpq/hba.c
@@ -1041,7 +1041,7 @@ parse_hba_line(TokenizedLine *tok_line, int elevel)
 			ereport(elevel,
 					(errcode(ERRCODE_CONFIG_FILE_ERROR),
 					 errmsg("hostssl record cannot match because SSL is not supported by this build"),
-					 errhint("Compile with --with-openssl to use SSL connections."),
+					 errhint("Compile with --with-openssl or --with-nss to use SSL connections."),
 					 errcontext("line %d of configuration file \"%s\"",
 								line_num, HbaFileName)));
 			*err_msg = "hostssl record cannot match because SSL is not supported by this build";
diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c
index 17579eeaca..0095a9980e 100644
--- a/src/backend/utils/misc/guc.c
+++ b/src/backend/utils/misc/guc.c
@@ -4308,7 +4308,11 @@ static struct config_string ConfigureNamesString[] =
 		},
 		&ssl_library,
 #ifdef USE_SSL
+#if defined(USE_OPENSSL)
 		"OpenSSL",
+#elif defined(USE_NSS)
+		"NSS",
+#endif
 #else
 		"",
 #endif
@@ -4366,6 +4370,18 @@ static struct config_string ConfigureNamesString[] =
 		check_canonical_path, assign_pgstat_temp_directory, NULL
 	},
 
+#ifdef USE_NSS
+	{
+		{"ssl_database", PGC_SIGHUP, CONN_AUTH_SSL,
+			gettext_noop("Location of the NSS certificate database."),
+			NULL
+		},
+		&ssl_database,
+		"",
+		NULL, NULL, NULL
+	},
+#endif
+
 	{
 		{"synchronous_standby_names", PGC_SIGHUP, REPLICATION_PRIMARY,
 			gettext_noop("Number of synchronous standbys and list of names of potential synchronous ones."),
@@ -4394,8 +4410,10 @@ static struct config_string ConfigureNamesString[] =
 			GUC_SUPERUSER_ONLY
 		},
 		&SSLCipherSuites,
-#ifdef USE_OPENSSL
+#if defined(USE_OPENSSL)
 		"HIGH:MEDIUM:+3DES:!aNULL",
+#elif defined (USE_NSS)
+		"",
 #else
 		"none",
 #endif
diff --git a/src/common/Makefile b/src/common/Makefile
index 93eb27a2aa..7a4b3dad5d 100644
--- a/src/common/Makefile
+++ b/src/common/Makefile
@@ -80,7 +80,7 @@ OBJS_COMMON = \
 	wait_error.o \
 	wchar.o
 
-ifeq ($(with_openssl),yes)
+ifeq ($(with_ssl),openssl)
 OBJS_COMMON += \
 	protocol_openssl.o \
 	cryptohash_openssl.o
diff --git a/src/include/common/pg_nss.h b/src/include/common/pg_nss.h
new file mode 100644
index 0000000000..008fee85f1
--- /dev/null
+++ b/src/include/common/pg_nss.h
@@ -0,0 +1,175 @@
+/*-------------------------------------------------------------------------
+ *
+ * pg_nss.h
+ *	  Support for NSS as a TLS backend
+ *
+ * These definitions are used by both frontend and backend code.
+ *
+ * Copyright (c) 2020, PostgreSQL Global Development Group
+ *
+ * IDENTIFICATION
+ *        src/include/common/pg_nss.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef PG_NSS_H
+#define PG_NSS_H
+
+#ifdef USE_NSS
+#define NO_NSPR_10_SUPPORT
+#include <nss/hasht.h>
+#include <nss/secoidt.h>
+#include <nss/sslproto.h>
+
+PRUint16	pg_find_cipher(char *name);
+
+typedef struct
+{
+	SECOidTag	signature;
+	SECOidTag	hash;
+	int			len;
+}			NSSSignatureAlgorithms;
+
+typedef struct
+{
+	const char *name;
+	PRUint16	number;
+}			NSSCiphers;
+
+#define INVALID_CIPHER	0xFFFF
+
+static const NSSSignatureAlgorithms NSS_SCRAMDigestAlgorithm[] = {
+
+	{SEC_OID_PKCS1_MD5_WITH_RSA_ENCRYPTION, SEC_OID_SHA256, SHA256_LENGTH},
+	{SEC_OID_PKCS1_SHA1_WITH_RSA_ENCRYPTION, SEC_OID_SHA256, SHA256_LENGTH},
+	{SEC_OID_ISO_SHA_WITH_RSA_SIGNATURE, SEC_OID_SHA256, SHA256_LENGTH},
+	{SEC_OID_ISO_SHA1_WITH_RSA_SIGNATURE, SEC_OID_SHA256, SHA256_LENGTH},
+	{SEC_OID_PKCS5_PBE_WITH_MD5_AND_DES_CBC, SEC_OID_SHA256, SHA256_LENGTH},
+
+	{SEC_OID_ANSIX962_ECDSA_SHA224_SIGNATURE, SEC_OID_SHA224, SHA224_LENGTH},
+	{SEC_OID_PKCS1_SHA224_WITH_RSA_ENCRYPTION, SEC_OID_SHA224, SHA224_LENGTH},
+	{SEC_OID_NIST_DSA_SIGNATURE_WITH_SHA224_DIGEST, SEC_OID_SHA224, SHA224_LENGTH},
+
+	{SEC_OID_ANSIX962_ECDSA_SHA256_SIGNATURE, SEC_OID_SHA256, SHA256_LENGTH},
+	{SEC_OID_PKCS1_SHA256_WITH_RSA_ENCRYPTION, SEC_OID_SHA256, SHA256_LENGTH},
+	{SEC_OID_NIST_DSA_SIGNATURE_WITH_SHA256_DIGEST, SEC_OID_SHA256, SHA256_LENGTH},
+
+	{SEC_OID_ANSIX962_ECDSA_SHA384_SIGNATURE, SEC_OID_SHA384, SHA384_LENGTH},
+	{SEC_OID_PKCS1_SHA384_WITH_RSA_ENCRYPTION, SEC_OID_SHA384, SHA384_LENGTH},
+
+	{SEC_OID_ANSIX962_ECDSA_SHA512_SIGNATURE, SEC_OID_SHA512, SHA512_LENGTH},
+	{SEC_OID_PKCS1_SHA512_WITH_RSA_ENCRYPTION, SEC_OID_SHA512, SHA512_LENGTH},
+
+	{0, 0}
+};
+
+/*
+ * This list is a partial copy of the ciphers in NSS files lib/ssl/sslproto.h
+ * in order to provide a human readable version of the ciphers. It would be
+ * nice to not have to have this, but NSS doesn't provide any API addressing
+ * the ciphers by name. TODO: do we want more of the ciphers, or perhaps less?
+ */
+static const NSSCiphers NSS_CipherList[] = {
+
+	{"TLS_NULL_WITH_NULL_NULL", TLS_NULL_WITH_NULL_NULL},
+
+	{"TLS_RSA_WITH_NULL_MD5", TLS_RSA_WITH_NULL_MD5},
+	{"TLS_RSA_WITH_NULL_SHA", TLS_RSA_WITH_NULL_SHA},
+	{"TLS_RSA_WITH_RC4_128_MD5", TLS_RSA_WITH_RC4_128_MD5},
+	{"TLS_RSA_WITH_RC4_128_SHA", TLS_RSA_WITH_RC4_128_SHA},
+	{"TLS_RSA_WITH_IDEA_CBC_SHA", TLS_RSA_WITH_IDEA_CBC_SHA},
+	{"TLS_RSA_WITH_DES_CBC_SHA", TLS_RSA_WITH_DES_CBC_SHA},
+	{"TLS_RSA_WITH_3DES_EDE_CBC_SHA", TLS_RSA_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_DH_DSS_WITH_DES_CBC_SHA", TLS_DH_DSS_WITH_DES_CBC_SHA},
+	{"TLS_DH_DSS_WITH_3DES_EDE_CBC_SHA", TLS_DH_DSS_WITH_3DES_EDE_CBC_SHA},
+	{"TLS_DH_RSA_WITH_DES_CBC_SHA", TLS_DH_RSA_WITH_DES_CBC_SHA},
+	{"TLS_DH_RSA_WITH_3DES_EDE_CBC_SHA", TLS_DH_RSA_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_DHE_DSS_WITH_DES_CBC_SHA", TLS_DHE_DSS_WITH_DES_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_3DES_EDE_CBC_SHA", TLS_DHE_DSS_WITH_3DES_EDE_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_DES_CBC_SHA", TLS_DHE_RSA_WITH_DES_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA", TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_DH_anon_WITH_RC4_128_MD5", TLS_DH_anon_WITH_RC4_128_MD5},
+	{"TLS_DH_anon_WITH_DES_CBC_SHA", TLS_DH_anon_WITH_DES_CBC_SHA},
+	{"TLS_DH_anon_WITH_3DES_EDE_CBC_SHA", TLS_DH_anon_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_RSA_WITH_AES_128_CBC_SHA", TLS_RSA_WITH_AES_128_CBC_SHA},
+	{"TLS_DH_DSS_WITH_AES_128_CBC_SHA", TLS_DH_DSS_WITH_AES_128_CBC_SHA},
+	{"TLS_DH_RSA_WITH_AES_128_CBC_SHA", TLS_DH_RSA_WITH_AES_128_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_AES_128_CBC_SHA", TLS_DHE_DSS_WITH_AES_128_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_AES_128_CBC_SHA", TLS_DHE_RSA_WITH_AES_128_CBC_SHA},
+	{"TLS_DH_anon_WITH_AES_128_CBC_SHA", TLS_DH_anon_WITH_AES_128_CBC_SHA},
+
+	{"TLS_RSA_WITH_AES_256_CBC_SHA", TLS_RSA_WITH_AES_256_CBC_SHA},
+	{"TLS_DH_DSS_WITH_AES_256_CBC_SHA", TLS_DH_DSS_WITH_AES_256_CBC_SHA},
+	{"TLS_DH_RSA_WITH_AES_256_CBC_SHA", TLS_DH_RSA_WITH_AES_256_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_AES_256_CBC_SHA", TLS_DHE_DSS_WITH_AES_256_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_AES_256_CBC_SHA", TLS_DHE_RSA_WITH_AES_256_CBC_SHA},
+	{"TLS_DH_anon_WITH_AES_256_CBC_SHA", TLS_DH_anon_WITH_AES_256_CBC_SHA},
+	{"TLS_RSA_WITH_NULL_SHA256", TLS_RSA_WITH_NULL_SHA256},
+	{"TLS_RSA_WITH_AES_128_CBC_SHA256", TLS_RSA_WITH_AES_128_CBC_SHA256},
+	{"TLS_RSA_WITH_AES_256_CBC_SHA256", TLS_RSA_WITH_AES_256_CBC_SHA256},
+
+	{"TLS_DHE_DSS_WITH_AES_128_CBC_SHA256", TLS_DHE_DSS_WITH_AES_128_CBC_SHA256},
+	{"TLS_RSA_WITH_CAMELLIA_128_CBC_SHA", TLS_RSA_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DH_DSS_WITH_CAMELLIA_128_CBC_SHA", TLS_DH_DSS_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DH_RSA_WITH_CAMELLIA_128_CBC_SHA", TLS_DH_RSA_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_CAMELLIA_128_CBC_SHA", TLS_DHE_DSS_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA", TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DH_anon_WITH_CAMELLIA_128_CBC_SHA", TLS_DH_anon_WITH_CAMELLIA_128_CBC_SHA},
+
+	{"TLS_DHE_DSS_WITH_RC4_128_SHA", TLS_DHE_DSS_WITH_RC4_128_SHA},
+	{"TLS_DHE_RSA_WITH_AES_128_CBC_SHA256", TLS_DHE_RSA_WITH_AES_128_CBC_SHA256},
+	{"TLS_DHE_DSS_WITH_AES_256_CBC_SHA256", TLS_DHE_DSS_WITH_AES_256_CBC_SHA256},
+	{"TLS_DHE_RSA_WITH_AES_256_CBC_SHA256", TLS_DHE_RSA_WITH_AES_256_CBC_SHA256},
+
+	{"TLS_RSA_WITH_CAMELLIA_256_CBC_SHA", TLS_RSA_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DH_DSS_WITH_CAMELLIA_256_CBC_SHA", TLS_DH_DSS_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DH_RSA_WITH_CAMELLIA_256_CBC_SHA", TLS_DH_RSA_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_CAMELLIA_256_CBC_SHA", TLS_DHE_DSS_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA", TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DH_anon_WITH_CAMELLIA_256_CBC_SHA", TLS_DH_anon_WITH_CAMELLIA_256_CBC_SHA},
+
+	{"TLS_RSA_WITH_SEED_CBC_SHA", TLS_RSA_WITH_SEED_CBC_SHA},
+
+	{"TLS_RSA_WITH_AES_128_GCM_SHA256", TLS_RSA_WITH_AES_128_GCM_SHA256},
+	{"TLS_RSA_WITH_AES_256_GCM_SHA384", TLS_RSA_WITH_AES_256_GCM_SHA384},
+	{"TLS_DHE_RSA_WITH_AES_128_GCM_SHA256", TLS_DHE_RSA_WITH_AES_128_GCM_SHA256},
+	{"TLS_DHE_RSA_WITH_AES_256_GCM_SHA384", TLS_DHE_RSA_WITH_AES_256_GCM_SHA384},
+	{"TLS_DHE_DSS_WITH_AES_128_GCM_SHA256", TLS_DHE_DSS_WITH_AES_128_GCM_SHA256},
+	{"TLS_DHE_DSS_WITH_AES_256_GCM_SHA384", TLS_DHE_DSS_WITH_AES_256_GCM_SHA384},
+
+	{"TLS_AES_128_GCM_SHA256", TLS_AES_128_GCM_SHA256},
+	{"TLS_AES_256_GCM_SHA384", TLS_AES_256_GCM_SHA384},
+	{"TLS_CHACHA20_POLY1305_SHA256", TLS_CHACHA20_POLY1305_SHA256},
+	{NULL, 0}
+};
+
+/*
+ * pg_find_cipher
+ *			Translate an NSS ciphername to the cipher code
+ *
+ * Searches the configured ciphers for the corresponding cipher code to the
+ * name. Search is performed case insensitive.
+ */
+PRUint16
+pg_find_cipher(char *name)
+{
+	const		NSSCiphers *cipher_list = NSS_CipherList;
+
+	while (cipher_list->name)
+	{
+		if (pg_strcasecmp(cipher_list->name, name) == 0)
+			return cipher_list->number;
+
+		cipher_list++;
+	}
+
+	return 0xFFFF;
+}
+
+#endif							/* USE_NSS */
+
+#endif							/* PG_NSS_H */
diff --git a/src/include/libpq/libpq-be.h b/src/include/libpq/libpq-be.h
index 66a8673d93..ea373a0ae0 100644
--- a/src/include/libpq/libpq-be.h
+++ b/src/include/libpq/libpq-be.h
@@ -193,13 +193,18 @@ typedef struct Port
 	bool		peer_cert_valid;
 
 	/*
-	 * OpenSSL structures. (Keep these last so that the locations of other
-	 * fields are the same whether or not you build with OpenSSL.)
+	 * SSL backend specific structures. (Keep these last so that the locations
+	 * of other fields are the same whether or not you build with SSL
+	 * enabled.)
 	 */
 #ifdef USE_OPENSSL
 	SSL		   *ssl;
 	X509	   *peer;
 #endif
+
+#ifdef USE_NSS
+	void	   *pr_fd;
+#endif
 } Port;
 
 #ifdef USE_SSL
@@ -283,7 +288,7 @@ extern void be_tls_get_peer_serial(Port *port, char *ptr, size_t len);
  * This is not supported with old versions of OpenSSL that don't have
  * the X509_get_signature_nid() function.
  */
-#if defined(USE_OPENSSL) && defined(HAVE_X509_GET_SIGNATURE_NID)
+#if defined(USE_NSS) || (defined(USE_OPENSSL) && defined(HAVE_X509_GET_SIGNATURE_NID))
 #define HAVE_BE_TLS_GET_CERTIFICATE_HASH
 extern char *be_tls_get_certificate_hash(Port *port, size_t *len);
 #endif
@@ -293,6 +298,10 @@ extern char *be_tls_get_certificate_hash(Port *port, size_t *len);
 typedef void (*openssl_tls_init_hook_typ) (SSL_CTX *context, bool isServerStart);
 extern PGDLLIMPORT openssl_tls_init_hook_typ openssl_tls_init_hook;
 #endif
+#ifdef USE_NSS
+typedef void (*nss_tls_init_hook_type) (bool isServerStart);
+extern PGDLLIMPORT nss_tls_init_hook_type nss_tls_init_hook;
+#endif
 
 #endif							/* USE_SSL */
 
diff --git a/src/include/libpq/libpq.h b/src/include/libpq/libpq.h
index a55898c85a..d2860b852f 100644
--- a/src/include/libpq/libpq.h
+++ b/src/include/libpq/libpq.h
@@ -88,6 +88,9 @@ extern PGDLLIMPORT bool ssl_passphrase_command_supports_reload;
 #ifdef USE_SSL
 extern bool ssl_loaded_verify_locations;
 #endif
+#ifdef USE_NSS
+extern char *ssl_database;
+#endif
 
 extern int	secure_initialize(bool isServerStart);
 extern bool secure_loaded_verify_locations(void);
diff --git a/src/include/pg_config.h.in b/src/include/pg_config.h.in
index f4d9f3b408..67a9f90e5e 100644
--- a/src/include/pg_config.h.in
+++ b/src/include/pg_config.h.in
@@ -905,6 +905,9 @@
 /* Define to 1 to build with PAM support. (--with-pam) */
 #undef USE_PAM
 
+/* Define to build with NSS support (--with-nss) */
+#undef USE_NSS
+
 /* Define to 1 to use software CRC-32C implementation (slicing-by-8). */
 #undef USE_SLICING_BY_8_CRC32C
 
diff --git a/src/include/pg_config_manual.h b/src/include/pg_config_manual.h
index d27c8601fa..7861b94290 100644
--- a/src/include/pg_config_manual.h
+++ b/src/include/pg_config_manual.h
@@ -176,10 +176,9 @@
 
 /*
  * USE_SSL code should be compiled only when compiling with an SSL
- * implementation.  (Currently, only OpenSSL is supported, but we might add
- * more implementations in the future.)
+ * implementation.
  */
-#ifdef USE_OPENSSL
+#if defined(USE_OPENSSL) || defined(USE_NSS)
 #define USE_SSL
 #endif
 
diff --git a/src/interfaces/libpq/Makefile b/src/interfaces/libpq/Makefile
index c4fde3f93d..837e105ffe 100644
--- a/src/interfaces/libpq/Makefile
+++ b/src/interfaces/libpq/Makefile
@@ -45,12 +45,21 @@ OBJS = \
 	pqexpbuffer.o \
 	fe-auth.o
 
-ifeq ($(with_openssl),yes)
+ifneq ($(with_ssl),no)
+OBJS += \
+	fe-secure-common.o
+endif
+
+ifeq ($(with_ssl),openssl)
 OBJS += \
-	fe-secure-common.o \
 	fe-secure-openssl.o
 endif
 
+ifeq ($(with_ssl), nss)
+OBJS += \
+	fe-secure-nss.o
+endif
+
 ifeq ($(with_gssapi),yes)
 OBJS += \
 	fe-gssapi-common.o \
diff --git a/src/interfaces/libpq/fe-connect.c b/src/interfaces/libpq/fe-connect.c
index 2b78ed8ec3..79d3a35009 100644
--- a/src/interfaces/libpq/fe-connect.c
+++ b/src/interfaces/libpq/fe-connect.c
@@ -355,6 +355,10 @@ static const internalPQconninfoOption PQconninfoOptions[] = {
 		"Target-Session-Attrs", "", 11, /* sizeof("read-write") = 11 */
 	offsetof(struct pg_conn, target_session_attrs)},
 
+	{"cert_database", NULL, NULL, NULL,
+		"CertificateDatabase", "", 64,
+	offsetof(struct pg_conn, cert_database)},
+
 	/* Terminating entry --- MUST BE LAST */
 	{NULL, NULL, NULL, NULL,
 	NULL, NULL, 0}
diff --git a/src/interfaces/libpq/fe-secure-nss.c b/src/interfaces/libpq/fe-secure-nss.c
new file mode 100644
index 0000000000..dca0572e67
--- /dev/null
+++ b/src/interfaces/libpq/fe-secure-nss.c
@@ -0,0 +1,1112 @@
+/*-------------------------------------------------------------------------
+ *
+ * fe-secure-nss.c
+ *	  functions for supporting NSS as a TLS backend for frontend libpq
+ *
+ * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ *	  src/interfaces/libpq/fe-secure-nss.c
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#include "postgres_fe.h"
+
+#include "libpq-fe.h"
+#include "fe-auth.h"
+#include "fe-secure-common.h"
+#include "libpq-int.h"
+#include "common/pg_nss.h"
+
+/*
+ * BITS_PER_BYTE is also defined in the NSPR header files, so we need to undef
+ * our version to avoid compiler warnings on redefinition.
+ */
+#define pg_BITS_PER_BYTE BITS_PER_BYTE
+#undef BITS_PER_BYTE
+
+/*
+ * The nspr/obsolete/protypes.h NSPR header typedefs uint64 and int64 with
+ * colliding definitions from ours, causing a much expected compiler error.
+ * Remove backwards compatibility with ancient NSPR versions to avoid this.
+ */
+#define NO_NSPR_10_SUPPORT
+#include <nspr/nspr.h>
+#include <nspr/prerror.h>
+#include <nspr/prinit.h>
+#include <nspr/prio.h>
+#include <nss/hasht.h>
+#include <nss/nss.h>
+#include <nss/ssl.h>
+#include <nss/sslproto.h>
+#include <nss/pk11func.h>
+#include <nss/secerr.h>
+#include <nss/secoidt.h>
+#include <nss/secmod.h>
+
+/*
+ * Ensure that the colliding definitions match, else throw an error. In case
+ * NSPR remove the definition in a future version (however unlikely that may
+ * be, make sure to put ours back again.
+ */
+#if defined(BITS_PER_BYTE)
+#if BITS_PER_BYTE != pg_BITS_PER_BYTE
+#error "incompatible byte widths between NSPR and PostgreSQL"
+#endif
+#else
+#define BITS_PER_BYTE pg_BITS_PER_BYTE
+#endif
+#undef pg_BITS_PER_BYTE
+
+static SECStatus pg_load_nss_module(SECMODModule * *module, const char *library, const char *name);
+static SECStatus pg_bad_cert_handler(void *arg, PRFileDesc * fd);
+static const char *pg_SSLerrmessage(PRErrorCode errcode);
+static SECStatus pg_client_auth_handler(void *arg, PRFileDesc * socket, CERTDistNames * caNames,
+										CERTCertificate * *pRetCert, SECKEYPrivateKey * *pRetKey);
+static SECStatus pg_cert_auth_handler(void *arg, PRFileDesc * fd, PRBool checksig, PRBool isServer);
+static int	ssl_protocol_version_to_nss(const char *protocol);
+static bool cert_database_has_CA(PGconn *conn);
+
+static char *PQssl_passwd_cb(PK11SlotInfo * slot, PRBool retry, void *arg);
+
+/*
+ * PR_ImportTCPSocket() is a private API, but very widely used, as it's the
+ * only way to make NSS use an already set up POSIX file descriptor rather
+ * than opening one itself. To quote the NSS documentation:
+ *
+ *		"In theory, code that uses PR_ImportTCPSocket may break when NSPR's
+ *		implementation changes. In practice, this is unlikely to happen because
+ *		NSPR's implementation has been stable for years and because of NSPR's
+ *		strong commitment to backward compatibility."
+ *
+ * https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSPR/Reference/PR_ImportTCPSocket
+ *
+ * The function is declared in <private/pprio.h>, but as it is a header marked
+ * private we declare it here rather than including it.
+ */
+NSPR_API(PRFileDesc *) PR_ImportTCPSocket(int);
+
+static SECMODModule * ca_trust = NULL;
+static NSSInitContext * nss_context = NULL;
+
+/*
+ * This logic exist in NSS as well, but it's only available for when there is
+ * a database to open, and not only using the system trust store. Thus, we
+ * need to keep our own copy.
+ */
+#if defined(WIN32)
+static const char *ca_trust_name = "nssckbi.dll";
+#elif defined(__darwin__)
+static const char *ca_trust_name = "libnssckbi.dylib";
+#else
+static const char *ca_trust_name = "libnssckbi.so";
+#endif
+
+static PQsslKeyPassHook_nss_type PQsslKeyPassHook = NULL;
+
+/* ------------------------------------------------------------ */
+/*			 Procedures common to all secure sessions			*/
+/* ------------------------------------------------------------ */
+
+/*
+ * pgtls_init_library
+ *
+ * There is no direct equivalent for PQinitOpenSSL in NSS/NSPR, with PR_Init
+ * being the closest match there is. PR_Init is however already documented to
+ * not be required so simply making this a noop seems like the best option.
+ */
+void
+pgtls_init_library(bool do_ssl, int do_crypto)
+{
+	/* noop */
+}
+
+int
+pgtls_init(PGconn *conn)
+{
+	conn->ssl_in_use = false;
+	conn->has_password = false;
+
+	return 0;
+}
+
+void
+pgtls_close(PGconn *conn)
+{
+	if (nss_context)
+	{
+		NSS_ShutdownContext(nss_context);
+		nss_context = NULL;
+	}
+}
+
+PostgresPollingStatusType
+pgtls_open_client(PGconn *conn)
+{
+	SECStatus	status;
+	PRFileDesc *pr_fd;
+	PRFileDesc *model;
+	NSSInitParameters params;
+	SSLVersionRange desired_range;
+
+	/*
+	 * The NSPR documentation states that runtime initialization via PR_Init
+	 * is no longer required, as the first caller into NSPR will perform the
+	 * initialization implicitly. See be-secure-nss.c for further discussion
+	 * on PR_Init.
+	 */
+	PR_Init(PR_USER_THREAD, PR_PRIORITY_NORMAL, 0);
+
+	/*
+	 * NSS initialization and the use of contexts is further discussed in
+	 * be-secure-nss.c
+	 */
+	memset(&params, 0, sizeof(params));
+	params.length = sizeof(params);
+
+	if (conn->cert_database && strlen(conn->cert_database) > 0)
+	{
+		char	   *cert_database_path = psprintf("sql:%s", conn->cert_database);
+
+		nss_context = NSS_InitContext(cert_database_path, "", "", "",
+									  &params,
+									  NSS_INIT_READONLY | NSS_INIT_PK11RELOAD);
+		pfree(cert_database_path);
+
+		if (!nss_context)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("unable to open certificate database \"%s\": %s"),
+							  conn->cert_database,
+							  pg_SSLerrmessage(PR_GetError()));
+			return PGRES_POLLING_FAILED;
+		}
+	}
+	else
+	{
+		nss_context = NSS_InitContext("", "", "", "", &params,
+									  NSS_INIT_READONLY | NSS_INIT_NOCERTDB |
+									  NSS_INIT_NOMODDB | NSS_INIT_FORCEOPEN |
+									  NSS_INIT_NOROOTINIT | NSS_INIT_PK11RELOAD);
+		if (!nss_context)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("unable to create certificate database: %s"),
+							  pg_SSLerrmessage(PR_GetError()));
+			return PGRES_POLLING_FAILED;
+		}
+	}
+
+	/*
+	 * Configure cipher policy.
+	 */
+	status = NSS_SetDomesticPolicy();
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to configure cipher policy: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * If we don't have a certificate database, the system trust store is the
+	 * fallback we can use. If we fail to initialize that as well, we can
+	 * still attempt a connection as long as the sslmode isn't verify*.
+	 */
+	if (!conn->cert_database && conn->sslmode[0] == 'v')
+	{
+		status = pg_load_nss_module(&ca_trust, ca_trust_name, "\"Root Certificates\"");
+		if (status != SECSuccess)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("WARNING: unable to load NSS trust module \"%s\" : %s"),
+							  ca_trust_name,
+							  pg_SSLerrmessage(PR_GetError()));
+
+			return PGRES_POLLING_FAILED;
+		}
+	}
+
+
+	PK11_SetPasswordFunc(PQssl_passwd_cb);
+
+	/*
+	 * Import the already opened socket as we don't want to use NSPR functions
+	 * for opening the network socket due to how the PostgreSQL protocol works
+	 * with TLS connections. This function is not part of the NSPR public API,
+	 * see the comment at the top of the file for the rationale of still using
+	 * it.
+	 */
+	pr_fd = PR_ImportTCPSocket(conn->sock);
+	if (!pr_fd)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to attach to socket: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * Most of the documentation available, and implementations of, NSS/NSPR
+	 * use the PR_NewTCPSocket() function here, which has the drawback that it
+	 * can only create IPv4 sockets. Instead use PR_OpenTCPSocket() which
+	 * copes with IPv6 as well.
+	 */
+	model = SSL_ImportFD(NULL, PR_OpenTCPSocket(conn->laddr.addr.ss_family));
+	if (!model)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to enable TLS: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/* Disable old protocol versions (SSLv2 and SSLv3) */
+	SSL_OptionSet(model, SSL_ENABLE_SSL2, PR_FALSE);
+	SSL_OptionSet(model, SSL_V2_COMPATIBLE_HELLO, PR_FALSE);
+	SSL_OptionSet(model, SSL_ENABLE_SSL3, PR_FALSE);
+
+#ifdef SSL_CBC_RANDOM_IV
+
+	/*
+	 * Enable protection against the BEAST attack in case the NSS library has
+	 * support for that. While SSLv3 is disabled, we may still allow TLSv1
+	 * which is affected. The option isn't documented as an SSL option, but as
+	 * an NSS environment variable.
+	 */
+	SSL_OptionSet(model, SSL_CBC_RANDOM_IV, PR_TRUE);
+#endif
+
+	/* Set us up as a TLS client for the handshake */
+	SSL_OptionSet(model, SSL_HANDSHAKE_AS_CLIENT, PR_TRUE);
+
+	/*
+	 * When setting the available protocols, we either use the user defined
+	 * configuration values, and if missing we accept whatever is the highest
+	 * version supported by the library as the max and only limit the range in
+	 * the other end at TLSv1.0. ssl_variant_stream is a ProtocolVariant enum
+	 * for Stream protocols, rather than datagram.
+	 */
+	SSL_VersionRangeGetSupported(ssl_variant_stream, &desired_range);
+	desired_range.min = SSL_LIBRARY_VERSION_TLS_1_0;
+
+	if (conn->ssl_min_protocol_version && strlen(conn->ssl_min_protocol_version) > 0)
+	{
+		int			ssl_min_ver = ssl_protocol_version_to_nss(conn->ssl_min_protocol_version);
+
+		if (ssl_min_ver == -1)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("invalid value \"%s\" for minimum version of SSL protocol\n"),
+							  conn->ssl_min_protocol_version);
+			return -1;
+		}
+
+		desired_range.min = ssl_min_ver;
+	}
+
+	if (conn->ssl_max_protocol_version && strlen(conn->ssl_max_protocol_version) > 0)
+	{
+		int			ssl_max_ver = ssl_protocol_version_to_nss(conn->ssl_max_protocol_version);
+
+		if (ssl_max_ver == -1)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("invalid value \"%s\" for maximum version of SSL protocol\n"),
+							  conn->ssl_max_protocol_version);
+			return -1;
+		}
+
+		desired_range.max = ssl_max_ver;
+	}
+
+	if (SSL_VersionRangeSet(model, &desired_range) != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to set allowed SSL protocol version range: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * Set up callback for verifying server certificates, as well as for how
+	 * to handle failed verifications.
+	 */
+	SSL_AuthCertificateHook(model, pg_cert_auth_handler, (void *) conn);
+	SSL_BadCertHook(model, pg_bad_cert_handler, (void *) conn);
+
+	/*
+	 * Convert the NSPR socket to an SSL socket. Ensuring the success of this
+	 * operation is critical as NSS SSL_* functions may return SECSuccess on
+	 * the socket even though SSL hasn't been enabled, which introduce a risk
+	 * of silent downgrades.
+	 */
+	conn->pr_fd = SSL_ImportFD(model, pr_fd);
+	if (!conn->pr_fd)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to configure client for TLS: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * The model can now we closed as we've applied the settings of the model
+	 * onto the real socket. From hereon we should only use conn->pr_fd.
+	 */
+	PR_Close(model);
+
+	/* Set the private data to be passed to the password callback */
+	SSL_SetPKCS11PinArg(conn->pr_fd, (void *) conn);
+
+	/*
+	 * If a CRL file has been specified, verify if it exists in the database
+	 * but don't fail in case it doesn't.
+	 */
+	if (conn->sslcrl && strlen(conn->sslcrl) > 0)
+	{
+		/* XXX: Implement me.. */
+	}
+
+	status = SSL_ResetHandshake(conn->pr_fd, PR_FALSE);
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to initiate handshake: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * Set callback for client authentication when requested by the server.
+	 */
+	SSL_GetClientAuthDataHook(conn->pr_fd, pg_client_auth_handler, (void *) conn);
+
+	/*
+	 * Specify which hostname we are expecting to talk to. This is required,
+	 * albeit mostly applies to when opening a connection to a traditional
+	 * http server it seems.
+	 */
+	SSL_SetURL(conn->pr_fd, (conn->connhost[conn->whichhost]).host);
+
+	do
+	{
+		status = SSL_ForceHandshake(conn->pr_fd);
+	}
+	while (status != SECSuccess && PR_GetError() == PR_WOULD_BLOCK_ERROR);
+
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("SSL error: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	conn->ssl_in_use = true;
+	return PGRES_POLLING_OK;
+}
+
+ssize_t
+pgtls_read(PGconn *conn, void *ptr, size_t len)
+{
+	PRInt32		nread;
+	PRErrorCode status;
+	int			read_errno = 0;
+
+	/*
+	 * PR_Recv blocks until there is data to read or the timeout expires. We
+	 * don't want to sit blocked here, so the timeout is turned off by using
+	 * PR_INTERVAL_NO_WAIT which means "return immediately",  Zero is returned
+	 * for closed connections, while -1 indicates an error within the ongoing
+	 * connection.
+	 */
+	nread = PR_Recv(conn->pr_fd, ptr, len, 0, PR_INTERVAL_NO_WAIT);
+
+	if (nread == 0)
+	{
+		read_errno = ECONNRESET;
+		nread = -1;
+	}
+	else if (nread == -1)
+	{
+		status = PR_GetError();
+
+		switch (status)
+		{
+			case PR_IO_TIMEOUT_ERROR:
+				/* No data available yet. */
+				nread = 0;
+				break;
+
+			case PR_WOULD_BLOCK_ERROR:
+				read_errno = EWOULDBLOCK;
+				break;
+
+				/*
+				 * The error cases for PR_Recv are not documented, but can be
+				 * reverse engineered from _MD_unix_map_default_error() in the
+				 * NSPR code, defined in pr/src/md/unix/unix_errors.c.
+				 */
+			case PR_NETWORK_UNREACHABLE_ERROR:
+			case PR_CONNECT_RESET_ERROR:
+				read_errno = ECONNRESET;
+				break;
+
+			default:
+				break;
+		}
+
+		if (nread == -1)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("TLS read error: %s"),
+							  pg_SSLerrmessage(status));
+		}
+	}
+
+	SOCK_ERRNO_SET(read_errno);
+	return (ssize_t) nread;
+}
+
+/*
+ * pgtls_read_pending
+ *		Check for the existence of data to be read.
+ *
+ * This is part of the PostgreSQL TLS backend API.
+ */
+bool
+pgtls_read_pending(PGconn *conn)
+{
+	unsigned char c;
+	int			n;
+
+	/*
+	 * PR_Recv peeks into the stream with the timeount turned off, to see if
+	 * there is another byte to read off the wire. There is an NSS function
+	 * SSL_DataPending() which might seem like a better fit, but it will only
+	 * check already encrypted data in the SSL buffer, not still unencrypted
+	 * data, thus it doesn't guarantee that a subsequent call to
+	 * PR_Read/PR_Recv won't block.
+	 */
+	n = PR_Recv(conn->pr_fd, &c, 1, PR_MSG_PEEK, PR_INTERVAL_NO_WAIT);
+	return (n > 0);
+}
+
+ssize_t
+pgtls_write(PGconn *conn, const void *ptr, size_t len)
+{
+	PRInt32		n;
+	PRErrorCode status;
+	int			write_errno = 0;
+
+	n = PR_Write(conn->pr_fd, ptr, len);
+
+	if (n < 0)
+	{
+		status = PR_GetError();
+
+		switch (status)
+		{
+			case PR_WOULD_BLOCK_ERROR:
+#ifdef EAGAIN
+				write_errno = EAGAIN;
+#else
+				write_errno = EINTR;
+#endif
+				break;
+
+			default:
+				printfPQExpBuffer(&conn->errorMessage,
+								  libpq_gettext("TLS write error: %s"),
+								  pg_SSLerrmessage(status));
+				write_errno = ECONNRESET;
+				break;
+		}
+	}
+
+	SOCK_ERRNO_SET(write_errno);
+	return (ssize_t) n;
+}
+
+char *
+pgtls_get_peer_certificate_hash(PGconn *conn, size_t *len)
+{
+	CERTCertificate *server_cert;
+	SECOidTag	signature_alg;
+	SECOidTag	digest_alg;
+	int			digest_len;
+	const NSSSignatureAlgorithms *candidate;
+	PLArenaPool *arena;
+	SECItem		digest;
+	char	   *ret;
+	SECStatus	status;
+
+	*len = 0;
+
+	server_cert = SSL_PeerCertificate(conn->pr_fd);
+	if (!server_cert)
+		return NULL;
+
+	signature_alg = SECOID_GetAlgorithmTag(&server_cert->signature);
+
+	candidate = NSS_SCRAMDigestAlgorithm;
+	while (candidate->signature)
+	{
+		if (signature_alg == candidate->signature)
+		{
+			digest_alg = candidate->hash;
+			digest_len = candidate->len;
+			break;
+		}
+
+		candidate++;
+	}
+
+	if (!candidate->signature)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("could not find digest for OID '%s'\n"),
+						  SECOID_FindOIDTagDescription(signature_alg));
+		return NULL;
+	}
+
+	arena = PORT_NewArena(SEC_ASN1_DEFAULT_ARENA_SIZE);
+	digest.data = PORT_ArenaZAlloc(arena, sizeof(unsigned char) * digest_len);
+	digest.len = digest_len;
+
+	status = PK11_HashBuf(digest_alg, digest.data, server_cert->derCert.data,
+						  server_cert->derCert.len);
+
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to generate peer certificate digest: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		PORT_FreeArena(arena, PR_TRUE);
+		return NULL;
+	}
+
+	ret = pg_malloc(digest.len);
+	memcpy(ret, digest.data, digest.len);
+	*len = digest_len;
+	PORT_FreeArena(arena, PR_TRUE);
+
+	return ret;
+}
+
+/*
+ *	Verify that the server certificate matches the hostname we connected to.
+ *
+ * The certificate's Common Name and Subject Alternative Names are considered.
+ */
+int
+pgtls_verify_peer_name_matches_certificate_guts(PGconn *conn,
+												int *names_examined,
+												char **first_name)
+{
+	char	   *server_hostname = NULL;
+	CERTCertificate *server_cert = NULL;
+	SECStatus	status = SECSuccess;
+	SECItem		altname_item;
+	PLArenaPool *arena = NULL;
+	CERTGeneralName *san_list;
+	CERTGeneralName *cn;
+
+	server_hostname = SSL_RevealURL(conn->pr_fd);
+	if (!server_hostname || server_hostname[0] == '\0')
+		goto done;
+
+	/*
+	 * CERT_VerifyCertName will internally perform RFC 2818 SubjectAltName
+	 * verification.
+	 */
+	server_cert = SSL_PeerCertificate(conn->pr_fd);
+	status = CERT_VerifyCertName(server_cert, server_hostname);
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to verify server hostname: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		goto done;
+	}
+
+	status = CERT_FindCertExtension(server_cert, SEC_OID_X509_SUBJECT_ALT_NAME,
+									&altname_item);
+	if (status == SECSuccess)
+	{
+		arena = PORT_NewArena(DER_DEFAULT_CHUNKSIZE);
+		if (!arena)
+		{
+			status = SECFailure;
+			goto done;
+		}
+		san_list = CERT_DecodeAltNameExtension(arena, &altname_item);
+		if (!san_list)
+		{
+			status = SECFailure;
+			goto done;
+		}
+
+		for (cn = san_list; cn != san_list; cn = CERT_GetNextGeneralName(cn))
+		{
+			char	   *alt_name;
+			int			rv;
+			char		tmp[512];
+
+			status = CERT_RFC1485_EscapeAndQuote(tmp, sizeof(tmp),
+												 (char *) cn->name.other.data,
+												 cn->name.other.len);
+
+			if (status != SECSuccess)
+				goto done;
+
+			rv = pq_verify_peer_name_matches_certificate_name(conn, tmp,
+															  strlen(tmp),
+															  &alt_name);
+			if (alt_name)
+			{
+				if (!*first_name)
+					*first_name = alt_name;
+				else
+					free(alt_name);
+			}
+
+			if (rv == 1)
+				status = SECSuccess;
+			else
+			{
+				status = SECFailure;
+				break;
+			}
+		}
+	}
+	else if (PORT_GetError() == SEC_ERROR_EXTENSION_NOT_FOUND)
+		status = SECSuccess;
+	else
+		status = SECSuccess;
+
+done:
+	/* san_list will be freed by freeing the arena it was allocated in */
+	if (arena)
+		PORT_FreeArena(arena, PR_TRUE);
+	PR_Free(server_hostname);
+
+	if (status == SECSuccess)
+		return 1;
+
+	return 0;
+}
+
+/* ------------------------------------------------------------ */
+/*			PostgreSQL specific TLS support functions			*/
+/* ------------------------------------------------------------ */
+
+static const char *
+pg_SSLerrmessage(PRErrorCode errcode)
+{
+	const char *error;
+
+	/*
+	 * Try to get the user friendly error description, and if that fails try
+	 * to fall back on the name of the PRErrorCode.
+	 */
+	error = PR_ErrorToString(errcode, PR_LANGUAGE_I_DEFAULT);
+	if (!error)
+		error = PR_ErrorToName(errcode);
+	if (error)
+		return error;
+
+	return "unknown TLS error";
+}
+
+static SECStatus
+pg_load_nss_module(SECMODModule * *module, const char *library, const char *name)
+{
+	SECMODModule *mod;
+	char	   *modulespec;
+
+	modulespec = psprintf("library=\"%s\", name=\"%s\"", library, name);
+
+	/*
+	 * Attempt to load the specified module. The second parameter is "parent"
+	 * which should always be NULL for application code. The third parameter
+	 * defines if loading should recurse which is only applicable when loading
+	 * a module from within another module. This hierarchy would have to be
+	 * defined in the modulespec, and since we don't support anything but
+	 * directly addressed modules we should pass PR_FALSE.
+	 */
+	mod = SECMOD_LoadUserModule(modulespec, NULL, PR_FALSE);
+	pfree(modulespec);
+
+	if (mod && mod->loaded)
+	{
+		*module = mod;
+		return SECSuccess;
+	}
+
+	SECMOD_DestroyModule(mod);
+	return SECFailure;
+}
+
+/* ------------------------------------------------------------ */
+/*						NSS Callbacks							*/
+/* ------------------------------------------------------------ */
+
+/*
+ * pg_cert_auth_handler
+ *			Callback for authenticating server certificate
+ *
+ * This is pretty much the same procedure as the SSL_AuthCertificate function
+ * provided by NSS, with the difference being server hostname validation. With
+ * SSL_AuthCertificate there is no way to do verify-ca, it only does the -full
+ * flavor of our sslmodes, so we need our own implementation.
+ */
+static SECStatus
+pg_cert_auth_handler(void *arg, PRFileDesc *fd, PRBool checksig, PRBool isServer)
+{
+	SECStatus	status;
+	PGconn	   *conn = (PGconn *) arg;
+	CERTCertificate *server_cert;
+	void	   *pin;
+
+	Assert(!isServer);
+
+	pin = SSL_RevealPinArg(conn->pr_fd);
+	server_cert = SSL_PeerCertificate(conn->pr_fd);
+
+	status = CERT_VerifyCertificateNow((CERTCertDBHandle *) CERT_GetDefaultCertDB(),
+									   server_cert,
+									   checksig,
+									   certificateUsageSSLServer,
+									   pin,
+									   NULL);
+
+	/*
+	 * If we've already failed validation then there is no point in also
+	 * performing the hostname check for verify-full.
+	 */
+	if (status == SECSuccess)
+	{
+		if (!pq_verify_peer_name_matches_certificate(conn))
+			status = SECFailure;
+	}
+	else
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to verify certificate: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+	}
+
+	return status;
+}
+
+/*
+ * pg_client_auth_handler
+ *		Callback for client certificate validation
+ *
+ * The client auth callback is not on by default in NSS, so we need to invoke
+ * it ourselves to ensure we can do cert authentication. A TODO is to support
+ * running without a specified sslcert parameter. By retrieving all the certs
+ * via nickname from the cert database and see if we find one which apply with
+ * NSS_CmpCertChainWCANames() and PK11_FindKeyByAnyCert() we could support
+ * just running with a ssl database specified.
+ *
+ * For now, we use the default client certificate validation which requires a
+ * defined nickname to identify the cert in the database.
+ */
+static SECStatus
+pg_client_auth_handler(void *arg, PRFileDesc * socket, CERTDistNames * caNames,
+					   CERTCertificate * *pRetCert, SECKEYPrivateKey * *pRetKey)
+{
+	PGconn	   *conn = (PGconn *) arg;
+
+	return NSS_GetClientAuthData(conn->sslcert, socket, caNames, pRetCert, pRetKey);
+}
+
+/*
+ * pg_bad_cert_handler
+ *		Callback for failed certificate validation
+ *
+ * The TLS handshake will call this function iff the server certificate failed
+ * validation. Depending on the sslmode, we allow the connection anyways.
+ */
+static SECStatus
+pg_bad_cert_handler(void *arg, PRFileDesc * fd)
+{
+	PGconn	   *conn = (PGconn *) arg;
+	PRErrorCode err;
+
+	/*
+	 * This really shouldn't happen, as we've set the PGconn object as our
+	 * callback data, and at the callsite we know it will be populated. That
+	 * being said, the NSS code itself performs this check even when it should
+	 * not be required so let's use the same belts with our suspenders.
+	 */
+	if (!arg)
+		return SECFailure;
+
+	/*
+	 * For sslmodes other than verify-full and verify-ca we don't perform peer
+	 * validation, so return immediately.  sslmode require with a database
+	 * specified which contains a CA certificate will work like verify-ca to
+	 * be compatible with the OpenSSL implementation.
+	 */
+	if (strcmp(conn->sslmode, "require") == 0)
+	{
+		if (conn->cert_database && strlen(conn->cert_database) > 0 && cert_database_has_CA(conn))
+			return SECFailure;
+	}
+	if (conn->sslmode[0] == 'v')
+		return SECFailure;
+
+	err = PORT_GetError();
+
+	/*
+	 * TODO: these are relevant error codes that can occur in certificate
+	 * validation, figure out which we don't want for require/prefer etc.
+	 */
+	switch (err)
+	{
+		case SEC_ERROR_INVALID_AVA:
+		case SEC_ERROR_INVALID_TIME:
+		case SEC_ERROR_BAD_SIGNATURE:
+		case SEC_ERROR_EXPIRED_CERTIFICATE:
+		case SEC_ERROR_UNKNOWN_ISSUER:
+		case SEC_ERROR_UNTRUSTED_ISSUER:
+		case SEC_ERROR_UNTRUSTED_CERT:
+		case SEC_ERROR_CERT_VALID:
+		case SEC_ERROR_EXPIRED_ISSUER_CERTIFICATE:
+		case SEC_ERROR_CRL_EXPIRED:
+		case SEC_ERROR_CRL_BAD_SIGNATURE:
+		case SEC_ERROR_EXTENSION_VALUE_INVALID:
+		case SEC_ERROR_CA_CERT_INVALID:
+		case SEC_ERROR_CERT_USAGES_INVALID:
+		case SEC_ERROR_UNKNOWN_CRITICAL_EXTENSION:
+			return SECSuccess;
+			break;
+		default:
+			return SECFailure;
+			break;
+	}
+
+	/* Unreachable */
+	return SECSuccess;
+}
+
+/* ------------------------------------------------------------ */
+/*					SSL information functions					*/
+/* ------------------------------------------------------------ */
+
+/*
+ * PQgetssl
+ *
+ * Return NULL as this is legacy and defined to always be equal to calling
+ * PQsslStruct(conn, "OpenSSL"); This should ideally trigger a logged warning
+ * somewhere as it's nonsensical to run in a non-OpenSSL build, but the color
+ * of said bikeshed hasn't yet been determined.
+ */
+void *
+PQgetssl(PGconn *conn)
+{
+	return NULL;
+}
+
+void *
+PQsslStruct(PGconn *conn, const char *struct_name)
+{
+	if (!conn)
+		return NULL;
+
+	/*
+	 * Return the underlying PRFileDesc which can be used to access
+	 * information on the connection details. There is no SSL context per se.
+	 */
+	if (strcmp(struct_name, "NSS") == 0)
+		return conn->pr_fd;
+	return NULL;
+}
+
+const char *const *
+PQsslAttributeNames(PGconn *conn)
+{
+	static const char *const result[] = {
+		"library",
+		"cipher",
+		"protocol",
+		"key_bits",
+		"compression",
+		NULL
+	};
+
+	return result;
+}
+
+const char *
+PQsslAttribute(PGconn *conn, const char *attribute_name)
+{
+	SECStatus	status;
+	SSLChannelInfo channel;
+	SSLCipherSuiteInfo suite;
+
+	if (!conn || !conn->pr_fd)
+		return NULL;
+
+	if (strcmp(attribute_name, "library") == 0)
+		return "NSS";
+
+	status = SSL_GetChannelInfo(conn->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+		return NULL;
+
+	status = SSL_GetCipherSuiteInfo(channel.cipherSuite, &suite, sizeof(suite));
+	if (status != SECSuccess)
+		return NULL;
+
+	if (strcmp(attribute_name, "cipher") == 0)
+		return suite.cipherSuiteName;
+
+	if (strcmp(attribute_name, "key_bits") == 0)
+	{
+		static char key_bits_str[8];
+
+		snprintf(key_bits_str, sizeof(key_bits_str), "%i", suite.effectiveKeyBits);
+		return key_bits_str;
+	}
+
+	if (strcmp(attribute_name, "protocol") == 0)
+	{
+		switch (channel.protocolVersion)
+		{
+#ifdef SSL_LIBRARY_VERSION_TLS_1_3
+			case SSL_LIBRARY_VERSION_TLS_1_3:
+				return "TLSv1.3";
+#endif
+#ifdef SSL_LIBRARY_VERSION_TLS_1_2
+			case SSL_LIBRARY_VERSION_TLS_1_2:
+				return "TLSv1.2";
+#endif
+#ifdef SSL_LIBRARY_VERSION_TLS_1_1
+			case SSL_LIBRARY_VERSION_TLS_1_1:
+				return "TLSv1.1";
+#endif
+			case SSL_LIBRARY_VERSION_TLS_1_0:
+				return "TLSv1.0";
+			default:
+				return "unknown";
+		}
+	}
+
+	/*
+	 * NSS disabled support for compression in version 3.33, and it was only
+	 * available for SSLv3 at that point anyways, so we can safely return off
+	 * here without checking.
+	 */
+	if (strcmp(attribute_name, "compression") == 0)
+		return "off";
+
+	return NULL;
+}
+
+static int
+ssl_protocol_version_to_nss(const char *protocol)
+{
+	if (pg_strcasecmp("TLSv1", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_0;
+
+#ifdef SSL_LIBRARY_VERSION_TLS_1_1
+	if (pg_strcasecmp("TLSv1.1", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_1;
+#endif
+
+#ifdef SSL_LIBRARY_VERSION_TLS_1_2
+	if (pg_strcasecmp("TLSv1.2", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_2;
+#endif
+
+#ifdef SSL_LIBRARY_VERSION_TLS_1_3
+	if (pg_strcasecmp("TLSv1.3", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_3;
+#endif
+
+	return -1;
+}
+
+/*
+ * cert_database_has_CA
+ *
+ * Returns true in case there is a CA certificate in the database connected
+ * to in the conn object, else false. This function only checks for the
+ * presence of a CA certificate, not it's validity and/or usefulness.
+ */
+static bool
+cert_database_has_CA(PGconn *conn)
+{
+	CERTCertList *certificates;
+	bool		hasCA;
+
+	/*
+	 * If the certificate database has a password we must provide it, since
+	 * this API doesn't invoke the standard password callback.
+	 */
+	if (conn->has_password)
+		certificates = PK11_ListCerts(PK11CertListCA, PQssl_passwd_cb(NULL, PR_FALSE, (void *) conn));
+	else
+		certificates = PK11_ListCerts(PK11CertListCA, NULL);
+	hasCA = !CERT_LIST_EMPTY(certificates);
+	CERT_DestroyCertList(certificates);
+
+	return hasCA;
+}
+
+PQsslKeyPassHook_nss_type
+PQgetSSLKeyPassHook_nss(void)
+{
+	return PQsslKeyPassHook;
+}
+
+void
+PQsetSSLKeyPassHook_nss(PQsslKeyPassHook_nss_type hook)
+{
+	PQsslKeyPassHook = hook;
+}
+
+/*
+ * Supply a password to decrypt a client certificate.
+ *
+ * This must match NSS type PK11PasswordFunc.
+ */
+static char *
+PQssl_passwd_cb(PK11SlotInfo *slot, PRBool retry, void *arg)
+{
+	PGconn	   *conn = (PGconn *) arg;
+
+	conn->has_password = true;
+
+	if (PQsslKeyPassHook)
+		return PQsslKeyPassHook(slot, (PRBool) retry, arg);
+	else
+		return PQdefaultSSLKeyPassHook_nss(slot, retry, arg);
+}
+
+/*
+ * The default password handler callback.
+ */
+char *
+PQdefaultSSLKeyPassHook_nss(PK11SlotInfo * slot, PRBool retry, void *arg)
+{
+	PGconn	   *conn = (PGconn *) arg;
+
+	/*
+	 * If the password didn't work the first time there is no point in
+	 * retrying as it hasn't changed.
+	 */
+	if (retry != PR_TRUE && conn->sslpassword && strlen(conn->sslpassword) > 0)
+		return PORT_Strdup(conn->sslpassword);
+
+	return NULL;
+}
diff --git a/src/interfaces/libpq/fe-secure.c b/src/interfaces/libpq/fe-secure.c
index 67b1e78512..0a1e47c5a2 100644
--- a/src/interfaces/libpq/fe-secure.c
+++ b/src/interfaces/libpq/fe-secure.c
@@ -427,6 +427,9 @@ PQsslAttributeNames(PGconn *conn)
 
 	return result;
 }
+#endif							/* USE_SSL */
+
+#ifndef USE_OPENSSL
 
 PQsslKeyPassHook_OpenSSL_type
 PQgetSSLKeyPassHook_OpenSSL(void)
@@ -445,7 +448,7 @@ PQdefaultSSLKeyPassHook_OpenSSL(char *buf, int size, PGconn *conn)
 {
 	return 0;
 }
-#endif							/* USE_SSL */
+#endif							/* USE_OPENSSL */
 
 /* Dummy version of GSSAPI information functions, when built without GSS support */
 #ifndef ENABLE_GSS
diff --git a/src/interfaces/libpq/libpq-fe.h b/src/interfaces/libpq/libpq-fe.h
index c266ad5b13..aba32e6635 100644
--- a/src/interfaces/libpq/libpq-fe.h
+++ b/src/interfaces/libpq/libpq-fe.h
@@ -619,12 +619,23 @@ extern int	pg_valid_server_encoding_id(int encoding);
 
 /* === in fe-secure-openssl.c === */
 
-/* Support for overriding sslpassword handling with a callback. */
+/* Support for overriding sslpassword handling with a callback */
 typedef int (*PQsslKeyPassHook_OpenSSL_type) (char *buf, int size, PGconn *conn);
 extern PQsslKeyPassHook_OpenSSL_type PQgetSSLKeyPassHook_OpenSSL(void);
 extern void PQsetSSLKeyPassHook_OpenSSL(PQsslKeyPassHook_OpenSSL_type hook);
 extern int	PQdefaultSSLKeyPassHook_OpenSSL(char *buf, int size, PGconn *conn);
 
+/* == in fe-secure-nss.c === */
+typedef struct PK11SlotInfoStr PK11SlotInfo;
+typedef int PRIntn;
+typedef PRIntn PRBool;
+
+/* Support for overriding sslpassword handling with a callback */
+typedef char *(*PQsslKeyPassHook_nss_type) (PK11SlotInfo *slot, PRBool retry, void *arg);
+extern PQsslKeyPassHook_nss_type PQgetSSLKeyPassHook_nss(void);
+extern void PQsetSSLKeyPassHook_nss(PQsslKeyPassHook_nss_type hook);
+extern char *PQdefaultSSLKeyPassHook_nss(PK11SlotInfo *slot, PRBool retry, void *arg);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/src/interfaces/libpq/libpq-int.h b/src/interfaces/libpq/libpq-int.h
index 4db498369c..a95450fbba 100644
--- a/src/interfaces/libpq/libpq-int.h
+++ b/src/interfaces/libpq/libpq-int.h
@@ -362,6 +362,7 @@ struct pg_conn
 	char	   *sslpassword;	/* client key file password */
 	char	   *sslrootcert;	/* root certificate filename */
 	char	   *sslcrl;			/* certificate revocation list filename */
+	char	   *cert_database;	/* NSS certificate/key database */
 	char	   *requirepeer;	/* required peer credentials for local sockets */
 	char	   *gssencmode;		/* GSS mode (require,prefer,disable) */
 	char	   *krbsrvname;		/* Kerberos service name */
@@ -485,6 +486,23 @@ struct pg_conn
 								 * OpenSSL version changes */
 #endif
 #endif							/* USE_OPENSSL */
+
+#ifdef USE_NSS
+	void	   *pr_fd;			/* NSPR file descriptor for the connection */
+
+	/*
+	 * Track whether the NSS database has a password set or not. There is no
+	 * API function for retrieving password status of a database, but we need
+	 * to know since some NSS API calls require the password passed in (they
+	 * don't call the callback themselves). To track, we simply flip this to
+	 * true in case NSS invoked the password callback - as that will only
+	 * happen in case there is a password. The reason for tracking this is
+	 * that there are calls which require a password parameter, but doesn't
+	 * use the callbacks provided, so we must call the callback on behalf of
+	 * these.
+	 */
+	bool		has_password;
+#endif							/* USE_NSS */
 #endif							/* USE_SSL */
 
 #ifdef ENABLE_GSS
@@ -759,7 +777,7 @@ extern ssize_t pgtls_write(PGconn *conn, const void *ptr, size_t len);
  * This is not supported with old versions of OpenSSL that don't have
  * the X509_get_signature_nid() function.
  */
-#if defined(USE_OPENSSL) && defined(HAVE_X509_GET_SIGNATURE_NID)
+#if defined(USE_NSS) || (defined(USE_OPENSSL) && defined(HAVE_X509_GET_SIGNATURE_NID))
 #define HAVE_PGTLS_GET_PEER_CERTIFICATE_HASH
 extern char *pgtls_get_peer_certificate_hash(PGconn *conn, size_t *len);
 #endif
diff --git a/src/tools/msvc/Mkvcbuild.pm b/src/tools/msvc/Mkvcbuild.pm
index 5634b2d40c..a21eb088b3 100644
--- a/src/tools/msvc/Mkvcbuild.pm
+++ b/src/tools/msvc/Mkvcbuild.pm
@@ -194,12 +194,19 @@ sub mkvcbuild
 	$postgres->FullExportDLL('postgres.lib');
 
 	# The OBJS scraper doesn't know about ifdefs, so remove appropriate files
-	# if building without OpenSSL.
-	if (!$solution->{options}->{openssl})
+	# if building without various options.
+	if (!$solution->{options}->{openssl} && !$solution->{options}->{nss})
 	{
 		$postgres->RemoveFile('src/backend/libpq/be-secure-common.c');
+	}
+	if (!$solution->{options}->{openssl})
+	{
 		$postgres->RemoveFile('src/backend/libpq/be-secure-openssl.c');
 	}
+	if (!$solution->{options}->{nss})
+	{
+		$postgres->RemoveFile('src/backend/libpq/be-secure-nss.c');
+	}
 	if (!$solution->{options}->{gss})
 	{
 		$postgres->RemoveFile('src/backend/libpq/be-gssapi-common.c');
@@ -257,12 +264,19 @@ sub mkvcbuild
 	$libpq->AddReference($libpgcommon, $libpgport);
 
 	# The OBJS scraper doesn't know about ifdefs, so remove appropriate files
-	# if building without OpenSSL.
-	if (!$solution->{options}->{openssl})
+	# if building without various options
+	if (!$solution->{options}->{openssl} && !$solution->{options}->{nss})
 	{
 		$libpq->RemoveFile('src/interfaces/libpq/fe-secure-common.c');
+	}
+	if (!$solution->{options}->{openssl})
+	{
 		$libpq->RemoveFile('src/interfaces/libpq/fe-secure-openssl.c');
 	}
+	if (!$solution->{options}->{nss})
+	{
+		$libpq->RemoveFile('src/interfaces/libpq/fe-secure-nss.c');
+	}
 	if (!$solution->{options}->{gss})
 	{
 		$libpq->RemoveFile('src/interfaces/libpq/fe-gssapi-common.c');
diff --git a/src/tools/msvc/Solution.pm b/src/tools/msvc/Solution.pm
index 59a42bea97..d3d0ea3c95 100644
--- a/src/tools/msvc/Solution.pm
+++ b/src/tools/msvc/Solution.pm
@@ -488,6 +488,7 @@ sub GenerateFiles
 		USE_LLVM                   => undef,
 		USE_NAMED_POSIX_SEMAPHORES => undef,
 		USE_OPENSSL                => undef,
+		USE_NSS                    => undef,
 		USE_PAM                    => undef,
 		USE_SLICING_BY_8_CRC32C    => undef,
 		USE_SSE42_CRC32C           => undef,
@@ -540,6 +541,10 @@ sub GenerateFiles
 			$define{HAVE_OPENSSL_INIT_SSL}      = 1;
 		}
 	}
+	if ($self->{options}->{nss})
+	{
+		$define{USE_NSS} = 1;
+	}
 
 	$self->GenerateConfigHeader('src/include/pg_config.h',     \%define, 1);
 	$self->GenerateConfigHeader('src/include/pg_config_ext.h', \%define, 0);
@@ -1005,6 +1010,21 @@ sub AddProject
 			}
 		}
 	}
+	if ($self->{options}->{nss})
+	{
+		$proj->AddIncludeDir($self->{options}->{nss} . '\..\public\nss');
+		$proj->AddIncludeDir($self->{options}->{nss} . '\include\nspr');
+		foreach my $lib (qw(plds4 plc4 nspr4))
+		{
+			$proj->AddLibrary($self->{options}->{nss} .
+							  '\lib\lib' . "$lib.lib", 0);
+		}
+		foreach my $lib (qw(ssl3 smime3 nss3))
+		{
+			$proj->AddLibrary($self->{options}->{nss} .
+							  '\lib' . "\\$lib.dll.lib", 0);
+		}
+	}
 	if ($self->{options}->{nls})
 	{
 		$proj->AddIncludeDir($self->{options}->{nls} . '\include');
diff --git a/src/tools/msvc/config_default.pl b/src/tools/msvc/config_default.pl
index 2ef2cfc4e9..49dc4d5864 100644
--- a/src/tools/msvc/config_default.pl
+++ b/src/tools/msvc/config_default.pl
@@ -17,6 +17,7 @@ our $config = {
 	perl      => undef,    # --with-perl=<path>
 	python    => undef,    # --with-python=<path>
 	openssl   => undef,    # --with-openssl=<path>
+	nss       => undef,    # --with-nss=<path>
 	uuid      => undef,    # --with-uuid=<path>
 	xml       => undef,    # --with-libxml=<path>
 	xslt      => undef,    # --with-libxslt=<path>
-- 
2.25.1

From cf3460f1ed6b24162e08ae9a17cfe2ffdd4418e8 Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Wed, 28 Oct 2020 11:22:26 +0100
Subject: [PATCH v23 2/6] NSS Testharness updates

TODO:
	* Generate certificate/keys with NSS tooling for NSS specific test
	* Add test for certificate with embedded nulls
	* Fix SCRAM tests when channel binding works
---
 src/test/Makefile                             |   2 +-
 src/test/modules/Makefile                     |   2 +-
 .../modules/ssl_passphrase_callback/Makefile  |   2 +-
 .../ssl_passphrase_callback/t/001_testfunc.pl |   4 +-
 src/test/ssl/Makefile                         | 235 +++++++++++-
 src/test/ssl/t/001_ssltests.pl                | 346 +++++++++++-------
 src/test/ssl/t/002_scram.pl                   |  97 +++--
 src/test/ssl/t/SSL/Backend/NSS.pm             |  73 ++++
 src/test/ssl/t/SSL/Backend/OpenSSL.pm         | 103 ++++++
 .../ssl/t/{SSLServer.pm => SSL/Server.pm}     |  80 +++-
 10 files changed, 749 insertions(+), 195 deletions(-)
 create mode 100644 src/test/ssl/t/SSL/Backend/NSS.pm
 create mode 100644 src/test/ssl/t/SSL/Backend/OpenSSL.pm
 rename src/test/ssl/t/{SSLServer.pm => SSL/Server.pm} (78%)

diff --git a/src/test/Makefile b/src/test/Makefile
index ab1ef9a475..cee4586eb5 100644
--- a/src/test/Makefile
+++ b/src/test/Makefile
@@ -28,7 +28,7 @@ ifneq (,$(filter ldap,$(PG_TEST_EXTRA)))
 SUBDIRS += ldap
 endif
 endif
-ifeq ($(with_openssl),yes)
+ifeq ($(with_ssl),yes)
 ifneq (,$(filter ssl,$(PG_TEST_EXTRA)))
 SUBDIRS += ssl
 endif
diff --git a/src/test/modules/Makefile b/src/test/modules/Makefile
index 59921b46cf..5391f461a2 100644
--- a/src/test/modules/Makefile
+++ b/src/test/modules/Makefile
@@ -28,7 +28,7 @@ SUBDIRS = \
 		  unsafe_tests \
 		  worker_spi
 
-ifeq ($(with_openssl),yes)
+ifeq ($(with_ssl),openssl)
 SUBDIRS += ssl_passphrase_callback
 else
 ALWAYS_SUBDIRS += ssl_passphrase_callback
diff --git a/src/test/modules/ssl_passphrase_callback/Makefile b/src/test/modules/ssl_passphrase_callback/Makefile
index f81265c296..a34d7ea46a 100644
--- a/src/test/modules/ssl_passphrase_callback/Makefile
+++ b/src/test/modules/ssl_passphrase_callback/Makefile
@@ -1,6 +1,6 @@
 # ssl_passphrase_callback Makefile
 
-export with_openssl
+export with_ssl
 
 MODULE_big = ssl_passphrase_func
 OBJS = ssl_passphrase_func.o $(WIN32RES)
diff --git a/src/test/modules/ssl_passphrase_callback/t/001_testfunc.pl b/src/test/modules/ssl_passphrase_callback/t/001_testfunc.pl
index dbc084f870..a2bed5336c 100644
--- a/src/test/modules/ssl_passphrase_callback/t/001_testfunc.pl
+++ b/src/test/modules/ssl_passphrase_callback/t/001_testfunc.pl
@@ -7,9 +7,9 @@ use TestLib;
 use Test::More;
 use PostgresNode;
 
-unless (($ENV{with_openssl} || 'no') eq 'yes')
+unless ($ENV{with_ssl} eq 'openssl')
 {
-	plan skip_all => 'SSL not supported by this build';
+	plan skip_all => 'OpenSSL not supported by this build';
 }
 
 my $clearpass = "FooBaR1";
diff --git a/src/test/ssl/Makefile b/src/test/ssl/Makefile
index 93335b1ea2..d275c89672 100644
--- a/src/test/ssl/Makefile
+++ b/src/test/ssl/Makefile
@@ -13,7 +13,7 @@ subdir = src/test/ssl
 top_builddir = ../../..
 include $(top_builddir)/src/Makefile.global
 
-export with_openssl
+export with_ssl
 
 CERTIFICATES := server_ca server-cn-and-alt-names \
 	server-cn-only server-single-alt-name server-multiple-alt-names \
@@ -30,6 +30,35 @@ SSLFILES := $(CERTIFICATES:%=ssl/%.key) $(CERTIFICATES:%=ssl/%.crt) \
 	ssl/client+client_ca.crt ssl/client-der.key \
 	ssl/client-encrypted-pem.key ssl/client-encrypted-der.key
 
+# Even though we in practice could get away with far fewer NSS databases, they
+# are generated to mimic the setup for the OpenSSL tests in order to ensure
+# we isolate the same behavior between the backends. The database name should
+# contain the files included for easier test suite code reading.
+NSSFILES := ssl/nss/client_ca.crt.db \
+	ssl/nss/server_ca.crt.db \
+	ssl/nss/root+server_ca.crt.db \
+	ssl/nss/root+client_ca.crt.db \
+	ssl/nss/client.crt__client.key.db \
+	ssl/nss/client-revoked.crt__client-revoked.key.db \
+	ssl/nss/server-cn-only.crt__server-password.key.db \
+	ssl/nss/server-cn-only.crt__server-cn-only.key.db \
+	ssl/nss/root.crl \
+	ssl/nss/server.crl \
+	ssl/nss/client.crl \
+	ssl/nss/server-multiple-alt-names.crt__server-multiple-alt-names.key.db \
+	ssl/nss/server-single-alt-name.crt__server-single-alt-name.key.db \
+	ssl/nss/server-cn-and-alt-names.crt__server-cn-and-alt-names.key.db \
+	ssl/nss/server-no-names.crt__server-no-names.key.db \
+	ssl/nss/server-revoked.crt__server-revoked.key.db \
+	ssl/nss/root+client.crl \
+	ssl/nss/client+client_ca.crt__client.key.db \
+	ssl/nss/client.crt__client-encrypted-pem.key.db \
+	ssl/nss/root+server_ca.crt__server.crl.db \
+	ssl/nss/root+server_ca.crt__root+server.crl.db \
+	ssl/nss/native_ca-root.db \
+	ssl/nss/native_server-root.db \
+	ssl/nss/native_client-root.db
+
 # This target re-generates all the key and certificate files. Usually we just
 # use the ones that are committed to the tree without rebuilding them.
 #
@@ -37,6 +66,10 @@ SSLFILES := $(CERTIFICATES:%=ssl/%.key) $(CERTIFICATES:%=ssl/%.crt) \
 #
 sslfiles: $(SSLFILES)
 
+# Generate NSS certificate databases corresponding to the OpenSSL certificates.
+# This target will fail unless preceded by nssfiles-clean.
+nssfiles: $(NSSFILES)
+
 # OpenSSL requires a directory to put all generated certificates in. We don't
 # use this for anything, but we need a location.
 ssl/new_certs_dir:
@@ -64,6 +97,24 @@ ssl/%_ca.crt: ssl/%_ca.key %_ca.config ssl/root_ca.crt ssl/new_certs_dir
 	rm ssl/temp_ca.crt ssl/temp_ca_signed.crt
 	echo "01" > ssl/$*_ca.srl
 
+ssl/nss/%_ca.crt.db: ssl/%_ca.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n $*_ca.crt -i ssl/$*_ca.crt -t "CT,C,C"
+
+ssl/nss/root+server_ca.crt__server.crl.db: ssl/root+server_ca.crt ssl/nss/server.crl
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	crlutil -I -i ssl/nss/server.crl -d $@ -B
+
+ssl/nss/root+server_ca.crt__root+server.crl.db: ssl/root+server_ca.crt ssl/nss/root.crl ssl/nss/server.crl
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	crlutil -I -i ssl/nss/root.crl -d $@ -B
+	crlutil -I -i ssl/nss/server.crl -d $@ -B
+
 # Server certificates, signed by server CA:
 ssl/server-%.crt: ssl/server-%.key ssl/server_ca.crt server-%.config
 	openssl req -new -key ssl/server-$*.key -out ssl/server-$*.csr -config server-$*.config
@@ -77,6 +128,78 @@ ssl/server-ss.crt: ssl/server-cn-only.key ssl/server-cn-only.crt server-cn-only.
 	openssl x509 -req -days 10000 -in ssl/server-ss.csr -signkey ssl/server-cn-only.key -out ssl/server-ss.crt  -extensions v3_req -extfile server-cn-only.config
 	rm ssl/server-ss.csr
 
+# pk12util won't preserve the password when importing the password protected
+# key, the password must be set on the database *before* importing it as the
+# password in the pkcs12 envelope will be dropped.
+ssl/nss/server-cn-only.crt__server-password.key.db: ssl/server-cn-only.crt
+	$(MKDIR_P) $@
+	echo "secret1" > password.txt
+	certutil -d "sql:$@" -N -f password.txt
+	certutil -d "sql:$@" -A -n ssl/server-cn-only.crt -i ssl/server-cn-only.crt -t "CT,C,C" -f password.txt
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C" -f password.txt
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C" -f password.txt
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C" -f password.txt
+	openssl pkcs12 -export -out ssl/nss/server-password.pfx -inkey ssl/server-password.key -in ssl/server-cn-only.crt -certfile ssl/server_ca.crt -passin 'pass:secret1' -passout 'pass:secret1'
+	pk12util -i ssl/nss/server-password.pfx -d "sql:$@" -W 'secret1' -K 'secret1'
+
+ssl/nss/server-cn-only.crt__server-cn-only.key.db: ssl/server-cn-only.crt ssl/server-cn-only.key
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-cn-only.crt -i ssl/server-cn-only.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-cn-only.pfx -inkey ssl/server-cn-only.key -in ssl/server-cn-only.crt -certfile ssl/server_ca.crt -passout pass:
+	pk12util -i ssl/nss/server-cn-only.pfx -d "sql:$@" -W ''
+
+ssl/nss/server-multiple-alt-names.crt__server-multiple-alt-names.key.db: ssl/server-multiple-alt-names.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-multiple-alt-names.crt -i ssl/server-multiple-alt-names.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-multiple-alt-names.pfx -inkey ssl/server-multiple-alt-names.key -in ssl/server-multiple-alt-names.crt -certfile ssl/server-multiple-alt-names.crt -passout pass:
+	pk12util -i ssl/nss/server-multiple-alt-names.pfx -d "sql:$@" -W ''
+
+ssl/nss/server-single-alt-name.crt__server-single-alt-name.key.db: ssl/server-single-alt-name.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-single-alt-name.crt -i ssl/server-single-alt-name.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-single-alt-name.pfx -inkey ssl/server-single-alt-name.key -in ssl/server-single-alt-name.crt -certfile ssl/server-single-alt-name.crt -passout pass:
+	pk12util -i ssl/nss/server-single-alt-name.pfx -d "sql:$@" -W ''
+
+ssl/nss/server-cn-and-alt-names.crt__server-cn-and-alt-names.key.db: ssl/server-cn-and-alt-names.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-cn-and-alt-names.crt -i ssl/server-cn-and-alt-names.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-cn-and-alt-names.pfx -inkey ssl/server-cn-and-alt-names.key -in ssl/server-cn-and-alt-names.crt -certfile ssl/server-cn-and-alt-names.crt -passout pass:
+	pk12util -i ssl/nss/server-cn-and-alt-names.pfx -d $@ -W ''
+
+ssl/nss/server-no-names.crt__server-no-names.key.db: ssl/server-no-names.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-no-names.crt -i ssl/server-no-names.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-no-names.pfx -inkey ssl/server-no-names.key -in ssl/server-no-names.crt -certfile ssl/server-no-names.crt -passout pass:
+	pk12util -i ssl/nss/server-no-names.pfx -d "sql:$@" -W ''
+
+ssl/nss/server-revoked.crt__server-revoked.key.db: ssl/server-revoked.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-revoked.crt -i ssl/server-revoked.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-revoked.pfx -inkey ssl/server-revoked.key -in ssl/server-revoked.crt -certfile ssl/server-revoked.crt -passout pass:
+	pk12util -i ssl/nss/server-revoked.pfx -d "sql:$@" -W ''
+
 # Password-protected version of server-cn-only.key
 ssl/server-password.key: ssl/server-cn-only.key
 	openssl rsa -aes256 -in $< -out $@ -passout 'pass:secret1'
@@ -88,6 +211,27 @@ ssl/client.crt: ssl/client.key ssl/client_ca.crt
 	openssl x509 -in ssl/temp.crt -out ssl/client.crt # to keep just the PEM cert
 	rm ssl/client.csr ssl/temp.crt
 
+# Client certificate, signed by client CA
+ssl/nss/client.crt__client.key.db: ssl/client.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/client.crt -i ssl/client.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root+client_ca.crt -i ssl/root+client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client.pfx -inkey ssl/client.key -in ssl/client.crt -certfile ssl/client_ca.crt -passout pass:
+	pk12util -i ssl/nss/client.pfx -d "sql:$@" -W ''
+
+# Client certificate with encrypted key, signed by client CA
+ssl/nss/client.crt__client-encrypted-pem.key.db: ssl/client.crt
+	$(MKDIR_P) $@
+	echo 'dUmmyP^#+' > $@.pass
+	certutil -d "sql:$@" -N -f $@.pass
+	certutil -d "sql:$@" -A -f $@.pass -n ssl/client.crt -i ssl/client.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -f $@.pass -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -f $@.pass -n root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client-encrypted-pem.pfx -inkey ssl/client-encrypted-pem.key -in ssl/client.crt -certfile ssl/client_ca.crt -passin pass:'dUmmyP^#+' -passout pass:'dUmmyP^#+'
+	pk12util -i ssl/nss/client-encrypted-pem.pfx -d "sql:$@" -W 'dUmmyP^#+' -k $@.pass
+
 # Another client certificate, signed by the client CA. This one is revoked.
 ssl/client-revoked.crt: ssl/client-revoked.key ssl/client_ca.crt client.config
 	openssl req -new -key ssl/client-revoked.key -out ssl/client-revoked.csr -config client.config
@@ -95,6 +239,14 @@ ssl/client-revoked.crt: ssl/client-revoked.key ssl/client_ca.crt client.config
 	openssl x509 -in ssl/temp.crt -out ssl/client-revoked.crt # to keep just the PEM cert
 	rm ssl/client-revoked.csr ssl/temp.crt
 
+ssl/nss/client-revoked.crt__client-revoked.key.db: ssl/client-revoked.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/client-revoked.crt -i ssl/client-revoked.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client-revoked.pfx -inkey ssl/client-revoked.key -in ssl/client-revoked.crt -certfile ssl/client_ca.crt -passout pass:
+	pk12util -i ssl/nss/client-revoked.pfx -d "sql:$@" -W ''
+
 # Convert the key to DER, to test our behaviour there too
 ssl/client-der.key: ssl/client.key
 	openssl rsa -in ssl/client.key -outform DER -out ssl/client-der.key
@@ -127,19 +279,40 @@ ssl/root+client_ca.crt: ssl/root_ca.crt ssl/client_ca.crt
 ssl/client+client_ca.crt: ssl/client.crt ssl/client_ca.crt
 	cat $^ > $@
 
+# Client certificate, signed by client CA
+ssl/nss/client+client_ca.crt__client.key.db: ssl/client+client_ca.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/client+client_ca.crt -i ssl/client+client_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n ssl/root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client.pfx -inkey ssl/client.key -in ssl/client.crt -certfile ssl/client_ca.crt -passout pass:
+	pk12util -i ssl/nss/client.pfx -d "sql:$@" -W ''
+
 #### CRLs
 
 ssl/client.crl: ssl/client-revoked.crt
 	openssl ca -config cas.config -name client_ca -revoke ssl/client-revoked.crt
 	openssl ca -config cas.config -name client_ca -gencrl -out ssl/client.crl
 
+ssl/nss/client.crl: ssl/client.crl
+	openssl crl -in $^ -outform der -out $@
+
 ssl/server.crl: ssl/server-revoked.crt
 	openssl ca -config cas.config -name server_ca -revoke ssl/server-revoked.crt
 	openssl ca -config cas.config -name server_ca -gencrl -out ssl/server.crl
 
+ssl/nss/server.crl: ssl/server.crl
+	openssl crl -in $^ -outform der -out $@
+
 ssl/root.crl: ssl/root_ca.crt
 	openssl ca -config cas.config -name root_ca -gencrl -out ssl/root.crl
 
+ssl/nss/root.crl: ssl/root.crl
+	openssl crl -in $^ -outform der -out $@
+
+ssl/nss/root+client.crl: ssl/root+client.crl
+	openssl crl -in $^ -outform der -out $@
+
 # If a CRL is used, OpenSSL requires a CRL file for *all* the CAs in the
 # chain, even if some of them are empty.
 ssl/root+server.crl: ssl/root.crl ssl/server.crl
@@ -147,13 +320,73 @@ ssl/root+server.crl: ssl/root.crl ssl/server.crl
 ssl/root+client.crl: ssl/root.crl ssl/client.crl
 	cat $^ > $@
 
+#### NSS specific certificates and keys
+
+#NSSFILES2 := ssl/nss/native_ca-root.db \
+#	ssl/nss/native_server-root.db \
+#	ssl/nss/native_client-root.db
+
+#nssfiles2: $(NSSFILES2)
+
+ssl/nss/native_ca-%.db:
+	$(MKDIR_P) ssl/nss/native_ca-$*.db
+	certutil -N -d "sql:ssl/nss/native_ca-$*.db/" --empty-password
+	echo y > nss_ca_params.txt
+	echo 10 >> nss_ca_params.txt
+	echo y >> nss_ca_params.txt
+	cat nss_ca_params.txt | certutil -S -d "sql:ssl/nss/native_ca-$*.db/" -n ca-$* \
+	-s "CN=Test CA for PostgreSQL SSL regression tests,OU=PostgreSQL test suite" \
+	-x -k rsa -g 2048 -m 5432 -t CTu,CTu,CTu \
+	--keyUsage certSigning -2 --nsCertType sslCA,smimeCA,objectSigningCA \
+	-z Makefile -Z SHA256
+	rm nss_ca_params.txt
+
+ssl/nss/native_ca-%.pem: ssl/nss/native_ca-%.db
+	certutil -L -d "sql:ssl/nss/native_ca-$*.db/" -n ca-$* -a > ssl/nss/native_ca-$*.pem
+
+# Create and sign a server certificate
+ssl/nss/native_server-%.db: ssl/nss/native_ca-%.pem
+	$(MKDIR_P) ssl/nss/native_server-$*.db
+	certutil -N -d "sql:ssl/nss/native_server-$*.db/" --empty-password
+	certutil -R -d "sql:ssl/nss/native_server-$*.db/" \
+		-s "CN=common-name.pg-ssltest.test,OU=PostgreSQL test suite" \
+		-o ssl/nss/native_server-$*.csr -g 2048 -Z SHA256 -z Makefile
+	echo 1 > nss_server_params.txt
+	echo 9 >> nss_server_params.txt
+	cat nss_server_params.txt | certutil -C -d "sql:ssl/nss/native_ca-$*.db/" -c ca-root -i ssl/nss/native_server-$*.csr \
+		-o ssl/nss/native_server_$*.der -m 5433 --keyUsage dataEncipherment,digitalSignature,keyEncipherment \
+		--nsCertType sslServer --certVersion 1 -Z SHA256
+	certutil -A -d "sql:ssl/nss/native_server-$*.db/" -n ca-$* -t CTu,CTu,CTu -a -i ssl/nss/native_ca-$*.pem
+	certutil -A -d "sql:ssl/nss/native_server-$*.db/" -n ssl/native_server-$*.crt -t CTu,CTu,CTu -i ssl/nss/native_server_$*.der
+	rm nss_server_params.txt
+
+# Create and sign a client certificate
+ssl/nss/native_client-%.db: ssl/nss/native_ca-%.pem
+	$(MKDIR_P) ssl/nss/native_client-$*.db
+	certutil -N -d "sql:ssl/nss/native_client-$*.db/" --empty-password
+	certutil -R -d "sql:ssl/nss/native_client-$*.db/" -s "CN=ssltestuser,OU=PostgreSQL test suite" \
+		-o ssl/nss/native_client-$*.csr -g 2048 -Z SHA256 -z Makefile
+	certutil -C -d "sql:ssl/nss/native_ca-$*.db/" -c ca-$* -i ssl/nss/native_client-$*.csr -o ssl/nss/native_client-$*.der \
+		-m 5434 --keyUsage keyEncipherment,dataEncipherment,digitalSignature --nsCertType sslClient \
+		--certVersion 1 -Z SHA256
+	certutil -A -d "sql:ssl/nss/native_client-$*.db" -n ca-$* -t CTu,CTu,CTu -a -i ssl/nss/native_ca-$*.pem
+	certutil -A -d "sql:ssl/nss/native_client-$*.db" -n native_client-$* -t CTu,CTu,CTu -i ssl/nss/native_client-$*.der
+
+nssfiles2clean:
+	rm -rf ssl/nss
+
 .PHONY: sslfiles-clean
 sslfiles-clean:
 	rm -f $(SSLFILES) ssl/client_ca.srl ssl/server_ca.srl ssl/client_ca-certindex* ssl/server_ca-certindex* ssl/root_ca-certindex* ssl/root_ca.srl ssl/temp_ca.crt ssl/temp_ca_signed.crt
 
+.PHONY: nssfiles-clean
+nssfiles-clean:
+	rm -rf ssl/nss
+
 clean distclean maintainer-clean:
 	rm -rf tmp_check
 	rm -rf ssl/*.old ssl/new_certs_dir ssl/client*_tmp.key
+	rm -rf ssl/nss
 
 # Doesn't depend on $(SSLFILES) because we don't rebuild them by default
 check:
diff --git a/src/test/ssl/t/001_ssltests.pl b/src/test/ssl/t/001_ssltests.pl
index fd2727b568..6b8bca2846 100644
--- a/src/test/ssl/t/001_ssltests.pl
+++ b/src/test/ssl/t/001_ssltests.pl
@@ -4,17 +4,24 @@ use PostgresNode;
 use TestLib;
 use Test::More;
 
-use File::Copy;
-
 use FindBin;
 use lib $FindBin::RealBin;
 
-use SSLServer;
+use SSL::Server;
+
+my $openssl;
+my $nss;
 
-if ($ENV{with_openssl} eq 'yes')
+if ($ENV{with_ssl} eq 'openssl')
 {
+	$openssl = 1;
 	plan tests => 93;
 }
+elsif ($ENV{with_ssl} eq 'nss')
+{
+	$nss = 1;
+	plan tests => 99;
+}
 else
 {
 	plan skip_all => 'SSL not supported by this build';
@@ -32,32 +39,6 @@ my $SERVERHOSTCIDR = '127.0.0.1/32';
 # Allocation of base connection string shared among multiple tests.
 my $common_connstr;
 
-# The client's private key must not be world-readable, so take a copy
-# of the key stored in the code tree and update its permissions.
-#
-# This changes ssl/client.key to ssl/client_tmp.key etc for the rest
-# of the tests.
-my @keys = (
-	"client",     "client-revoked",
-	"client-der", "client-encrypted-pem",
-	"client-encrypted-der");
-foreach my $key (@keys)
-{
-	copy("ssl/${key}.key", "ssl/${key}_tmp.key")
-	  or die
-	  "couldn't copy ssl/${key}.key to ssl/${key}_tmp.key for permissions change: $!";
-	chmod 0600, "ssl/${key}_tmp.key"
-	  or die "failed to change permissions on ssl/${key}_tmp.key: $!";
-}
-
-# Also make a copy of that explicitly world-readable.  We can't
-# necessarily rely on the file in the source tree having those
-# permissions.  Add it to @keys to include it in the final clean
-# up phase.
-copy("ssl/client.key", "ssl/client_wrongperms_tmp.key");
-chmod 0644, "ssl/client_wrongperms_tmp.key";
-push @keys, 'client_wrongperms';
-
 #### Set up the server.
 
 note "setting up data directory";
@@ -72,36 +53,65 @@ $node->start;
 
 # Run this before we lock down access below.
 my $result = $node->safe_psql('postgres', "SHOW ssl_library");
-is($result, 'OpenSSL', 'ssl_library parameter');
+is($result, SSL::Server::ssl_library(), 'ssl_library parameter');
 
 configure_test_server_for_ssl($node, $SERVERHOSTADDR, $SERVERHOSTCIDR,
 	'trust');
 
 note "testing password-protected keys";
 
-open my $sslconf, '>', $node->data_dir . "/sslconfig.conf";
-print $sslconf "ssl=on\n";
-print $sslconf "ssl_cert_file='server-cn-only.crt'\n";
-print $sslconf "ssl_key_file='server-password.key'\n";
-print $sslconf "ssl_passphrase_command='echo wrongpassword'\n";
-close $sslconf;
+# Since the passphrase callbacks operate at different stages in OpenSSL and
+# NSS we have two separate blocks for them.
+SKIP:
+{
+	skip "Certificate passphrases aren't checked on server restart in NSS", 2
+	  if ($nss);
+
+	set_server_cert($node, 'server-cn-only', 'root+client_ca',
+					   'server-password', 'echo wrongpassword');
+	command_fails(
+		[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
+		'restart fails with password-protected key file with wrong password');
+	$node->_update_pid(0);
+
+	set_server_cert($node, 'server-cn-only', 'root+client_ca',
+					'server-password', 'echo secret1');
+	command_ok(
+		[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
+		'restart succeeds with password-protected key file');
+	$node->_update_pid(1);
+}
 
-command_fails(
-	[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
-	'restart fails with password-protected key file with wrong password');
-$node->_update_pid(0);
+SKIP:
+{
+	skip "Certificate passphrases are checked on connection in NSS", 5
+	  if ($openssl);
 
-open $sslconf, '>', $node->data_dir . "/sslconfig.conf";
-print $sslconf "ssl=on\n";
-print $sslconf "ssl_cert_file='server-cn-only.crt'\n";
-print $sslconf "ssl_key_file='server-password.key'\n";
-print $sslconf "ssl_passphrase_command='echo secret1'\n";
-close $sslconf;
+	set_server_cert($node, 'server-cn-only', 'root+client_ca',
+					   'server-password', 'echo wrongpassword');
+	command_ok(
+		[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
+		'restart fails with password-protected key file with wrong password');
+	$node->_update_pid(1);
 
-command_ok(
-	[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
-	'restart succeeds with password-protected key file');
-$node->_update_pid(1);
+	test_connect_fails(
+		"user=ssltestuser dbname=trustdb sslcert=invalid hostaddr=$SERVERHOSTADDR host=common-name.pg-ssltest.test",
+		"sslrootcert=invalid sslmode=require",
+		qr/\QSSL error\E/,
+		"connect to server with incorrect key password configured");
+
+	set_server_cert($node, 'server-cn-only', 'root+client_ca',
+					   'server-password', 'echo secret1');
+	command_ok(
+		[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
+		'restart fails with password-protected key file with wrong password');
+	$node->_update_pid(1);
+
+	test_connect_ok(
+		"user=ssltestuser dbname=trustdb sslcert=invalid hostaddr=$SERVERHOSTADDR host=common-name.pg-ssltest.test",
+		"sslrootcert=invalid sslmode=require",
+		"connect to server with correct key password configured");
+}
 
 # Test compatibility of SSL protocols.
 # TLSv1.1 is lower than TLSv1.2, so it won't work.
@@ -149,82 +159,105 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"sslrootcert=invalid sslmode=verify-ca",
-	qr/root certificate file "invalid" does not exist/,
+	qr/root certificate file "invalid" does not exist|Peer's Certificate issuer is not recognized/,
 	"connect without server root cert sslmode=verify-ca");
 test_connect_fails(
 	$common_connstr,
 	"sslrootcert=invalid sslmode=verify-full",
-	qr/root certificate file "invalid" does not exist/,
+	qr/root certificate file "invalid" does not exist|Peer's Certificate issuer is not recognized/,
 	"connect without server root cert sslmode=verify-full");
 
 # Try with wrong root cert, should fail. (We're using the client CA as the
 # root, but the server's key is signed by the server CA.)
-test_connect_fails($common_connstr,
-	"sslrootcert=ssl/client_ca.crt sslmode=require",
-	qr/SSL error/, "connect with wrong server root cert sslmode=require");
-test_connect_fails($common_connstr,
-	"sslrootcert=ssl/client_ca.crt sslmode=verify-ca",
-	qr/SSL error/, "connect with wrong server root cert sslmode=verify-ca");
-test_connect_fails($common_connstr,
-	"sslrootcert=ssl/client_ca.crt sslmode=verify-full",
-	qr/SSL error/, "connect with wrong server root cert sslmode=verify-full");
-
-# Try with just the server CA's cert. This fails because the root file
-# must contain the whole chain up to the root CA.
-test_connect_fails($common_connstr,
-	"sslrootcert=ssl/server_ca.crt sslmode=verify-ca",
-	qr/SSL error/, "connect with server CA cert, without root CA");
+test_connect_fails(
+	$common_connstr,
+	"sslrootcert=ssl/client_ca.crt sslmode=require cert_database=ssl/nss/client_ca.crt.db",
+	qr/SSL error/,
+	"connect with wrong server root cert sslmode=require");
+test_connect_fails(
+	$common_connstr,
+	"sslrootcert=ssl/client_ca.crt sslmode=verify-ca cert_database=ssl/nss/client_ca.crt.db",
+	qr/SSL error/,
+	"connect with wrong server root cert sslmode=verify-ca");
+test_connect_fails(
+	$common_connstr,
+	"sslrootcert=ssl/client_ca.crt sslmode=verify-full cert_database=ssl/nss/client_ca.crt.db",
+	qr/SSL error/,
+	"connect with wrong server root cert sslmode=verify-full");
+
+SKIP:
+{
+	# NSS supports partial chain validation, so this test doesn't work there.
+	# This is similar to the OpenSSL option X509_V_FLAG_PARTIAL_CHAIN which
+	# we don't allow.
+	skip "NSS support partial chain validation", 2 if ($nss);
+	# Try with just the server CA's cert. This fails because the root file
+	# must contain the whole chain up to the root CA.
+	test_connect_fails($common_connstr,
+		"sslrootcert=ssl/server_ca.crt sslmode=verify-ca",
+		qr/SSL error/, "connect with server CA cert, without root CA");
+}
 
 # And finally, with the correct root cert.
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require cert_database=ssl/nss/root+server_ca.crt.db",
 	"connect with correct server CA cert file sslmode=require");
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca cert_database=ssl/nss/root+server_ca.crt.db",
 	"connect with correct server CA cert file sslmode=verify-ca");
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-full",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db",
 	"connect with correct server CA cert file sslmode=verify-full");
 
-# Test with cert root file that contains two certificates. The client should
-# be able to pick the right one, regardless of the order in the file.
-test_connect_ok(
-	$common_connstr,
-	"sslrootcert=ssl/both-cas-1.crt sslmode=verify-ca",
-	"cert root file that contains two certificates, order 1");
-test_connect_ok(
-	$common_connstr,
-	"sslrootcert=ssl/both-cas-2.crt sslmode=verify-ca",
-	"cert root file that contains two certificates, order 2");
+SKIP:
+{
+	skip "CA ordering is irrelevant in NSS databases", 2 if ($nss);
 
+	# Test with cert root file that contains two certificates. The client should
+	# be able to pick the right one, regardless of the order in the file.
+	test_connect_ok(
+		$common_connstr,
+		"sslrootcert=ssl/both-cas-1.crt sslmode=verify-ca",
+		"cert root file that contains two certificates, order 1");
+
+	# How about import the both-file into a database?
+	test_connect_ok(
+		$common_connstr,
+		"sslrootcert=ssl/both-cas-2.crt sslmode=verify-ca",
+		"cert root file that contains two certificates, order 2");
+}
 # CRL tests
 
 # Invalid CRL filename is the same as no CRL, succeeds
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=invalid",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=invalid cert_database=ssl/nss/root+server_ca.crt.db",
 	"sslcrl option with invalid file name");
 
-# A CRL belonging to a different CA is not accepted, fails
-test_connect_fails(
-	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/client.crl",
-	qr/SSL error/,
-	"CRL belonging to a different CA");
+SKIP:
+{
+	skip "CRL's are verified when adding to NSS database", 2 if ($nss);
+	# A CRL belonging to a different CA is not accepted, fails
+	test_connect_fails(
+		$common_connstr,
+		"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/client.crl",
+		qr/SSL error/,
+		"CRL belonging to a different CA");
+}
 
 # With the correct CRL, succeeds (this cert is not revoked)
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/root+server.crl",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/root+server.crl cert_database=ssl/nss/root+server_ca.crt__root+server.crl.db",
 	"CRL with a non-revoked cert");
 
 # Check that connecting with verify-full fails, when the hostname doesn't
 # match the hostname in the server's certificate.
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -237,14 +270,14 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"sslmode=verify-full host=wronghost.test",
-	qr/\Qserver certificate for "common-name.pg-ssltest.test" does not match host name "wronghost.test"\E/,
+	qr/\Qserver certificate for "common-name.pg-ssltest.test" does not match host name "wronghost.test"\E|requested domain name does not match the server's certificate/,
 	"mismatch between host name and server certificate sslmode=verify-full");
 
 # Test Subject Alternative Names.
 switch_server_cert($node, 'server-multiple-alt-names');
 
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -262,12 +295,12 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"host=wronghost.alt-name.pg-ssltest.test",
-	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "wronghost.alt-name.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "wronghost.alt-name.pg-ssltest.test"\E|requested domain name does not match the server's certificate/,
 	"host name not matching with X.509 Subject Alternative Names");
 test_connect_fails(
 	$common_connstr,
 	"host=deep.subdomain.wildcard.pg-ssltest.test",
-	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E|requested domain name does not match the server's certificate/,
 	"host name not matching with X.509 Subject Alternative Names wildcard");
 
 # Test certificate with a single Subject Alternative Name. (this gives a
@@ -275,7 +308,7 @@ test_connect_fails(
 switch_server_cert($node, 'server-single-alt-name');
 
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -285,12 +318,12 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"host=wronghost.alt-name.pg-ssltest.test",
-	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "wronghost.alt-name.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "wronghost.alt-name.pg-ssltest.test"\E|requested domain name does not match the server's certificate/,
 	"host name not matching with a single X.509 Subject Alternative Name");
 test_connect_fails(
 	$common_connstr,
 	"host=deep.subdomain.wildcard.pg-ssltest.test",
-	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E|requested domain name does not match the server's certificate/,
 	"host name not matching with a single X.509 Subject Alternative Name wildcard"
 );
 
@@ -299,7 +332,7 @@ test_connect_fails(
 switch_server_cert($node, 'server-cn-and-alt-names');
 
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -312,14 +345,14 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"host=common-name.pg-ssltest.test",
-	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 1 other name) does not match host name "common-name.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 1 other name) does not match host name "common-name.pg-ssltest.test"\E|requested domain name does not match the server's certificate/,
 	"certificate with both a CN and SANs ignores CN");
 
 # Finally, test a server certificate that has no CN or SANs. Of course, that's
 # not a very sensible certificate, but libpq should handle it gracefully.
 switch_server_cert($node, 'server-no-names');
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -328,7 +361,7 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"sslmode=verify-full host=common-name.pg-ssltest.test",
-	qr/could not get server's host name from server certificate/,
+	qr/could not get server's host name from server certificate|requested domain name does not match the server's certificate./,
 	"server certificate without CN or SANs sslmode=verify-full");
 
 # Test that the CRL works
@@ -340,11 +373,11 @@ $common_connstr =
 # Without the CRL, succeeds. With it, fails.
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca cert_database=ssl/nss/root+server_ca.crt.db",
 	"connects without client-side CRL");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/root+server.crl",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/server.crl cert_database=ssl/nss/root+server_ca.crt__server.crl.db",
 	qr/SSL error/,
 	"does not connect with client-side CRL");
 
@@ -365,32 +398,50 @@ command_like(
 # Test min/max SSL protocol versions.
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.2",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.2 cert_database=ssl/nss/root+server_ca.crt.db",
 	"connection success with correct range of TLS protocol versions");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.1",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.1 cert_database=ssl/nss/root+server_ca.crt.db",
 	qr/invalid SSL protocol version range/,
 	"connection failure with incorrect range of TLS protocol versions");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=incorrect_tls",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=incorrect_tls cert_database=ssl/nss/root+server_ca.crt.db",
 	qr/invalid ssl_min_protocol_version value/,
 	"connection failure with an incorrect SSL protocol minimum bound");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_max_protocol_version=incorrect_tls",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_max_protocol_version=incorrect_tls cert_database=ssl/nss/root+server_ca.crt.db",
 	qr/invalid ssl_max_protocol_version value/,
 	"connection failure with an incorrect SSL protocol maximum bound");
 
+# tests of NSS generated certificates/keys
+SKIP:
+{
+	skip "NSS specific tests",            1 if ($openssl);
+
+	switch_server_cert($node, 'native_server-root', 'native_ca-root');
+	$common_connstr =
+	  "user=ssltestuser dbname=trustdb hostaddr=$SERVERHOSTADDR host=common-name.pg-ssltest.test";
+
+	test_connect_ok(
+		$common_connstr,
+		"sslmode=require user=ssltestuser",
+		"NSS generated certificates"
+	);
+}
+
 ### Server-side tests.
 ###
 ### Test certificate authorization.
 
+switch_server_cert($node, 'server-revoked');
+
 note "running server tests";
 
 $common_connstr =
-  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR";
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client.crt__client.key.db";
 
 # no client cert
 test_connect_fails(
@@ -406,32 +457,43 @@ test_connect_ok(
 	"certificate authorization succeeds with correct client cert in PEM format"
 );
 
-# correct client cert in unencrypted DER
-test_connect_ok(
-	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-der_tmp.key",
-	"certificate authorization succeeds with correct client cert in DER format"
-);
+$common_connstr =
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR";
+
+SKIP:
+{
+	skip "NSS database not implemented in the Makefile", 1 if ($nss);
+	# correct client cert in unencrypted DER
+	test_connect_ok(
+		$common_connstr,
+		"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-der_tmp.key",
+		"certificate authorization succeeds with correct client cert in DER format"
+	);
+}
 
 # correct client cert in encrypted PEM
 test_connect_ok(
 	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='dUmmyP^#+'",
+	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='dUmmyP^#+' cert_database=ssl/nss/client.crt__client-encrypted-pem.key.db",
 	"certificate authorization succeeds with correct client cert in encrypted PEM format"
 );
 
-# correct client cert in encrypted DER
-test_connect_ok(
-	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-der_tmp.key sslpassword='dUmmyP^#+'",
-	"certificate authorization succeeds with correct client cert in encrypted DER format"
-);
+SKIP:
+{
+	skip "NSS database not implemented in the Makefile", 1 if ($nss);
+	# correct client cert in encrypted DER
+	test_connect_ok(
+		$common_connstr,
+		"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-der_tmp.key sslpassword='dUmmyP^#+'",
+		"certificate authorization succeeds with correct client cert in encrypted DER format"
+	);
+}
 
 # correct client cert in encrypted PEM with wrong password
 test_connect_fails(
 	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='wrong'",
-	qr!\Qprivate key file "ssl/client-encrypted-pem_tmp.key": bad decrypt\E!,
+	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='wrong' cert_database=ssl/nss/client.crt__client-encrypted-pem.key.db",
+	qr!connection requires a valid client certificate|\Qprivate key file "ssl/client-encrypted-pem_tmp.key": bad decrypt\E!,
 	"certificate authorization fails with correct client cert and wrong password in encrypted PEM format"
 );
 
@@ -471,18 +533,19 @@ command_like(
 		'-P',
 		'null=_null_',
 		'-d',
-		"$common_connstr user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client_tmp.key",
+		"$common_connstr user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client_tmp.key cert_database=ssl/nss/client.crt__client.key.db",
 		'-c',
 		"SELECT * FROM pg_stat_ssl WHERE pid = pg_backend_pid()"
 	],
 	qr{^pid,ssl,version,cipher,bits,compression,client_dn,client_serial,issuer_dn\r?\n
-				^\d+,t,TLSv[\d.]+,[\w-]+,\d+,f,/CN=ssltestuser,1,\Q/CN=Test CA for PostgreSQL SSL regression test client certs\E\r?$}mx,
+				^\d+,t,TLSv[\d.]+,[\w-]+,\d+,f,/?CN=ssltestuser,1,/?\QCN=Test CA for PostgreSQL SSL regression test client certs\E\r?$}mx,
 	'pg_stat_ssl with client certificate');
 
 # client key with wrong permissions
 SKIP:
 {
 	skip "Permissions check not enforced on Windows", 2 if ($windows_os);
+	skip "Key not on filesystem with NSS",            2 if ($nss);
 
 	test_connect_fails(
 		$common_connstr,
@@ -495,10 +558,13 @@ SKIP:
 test_connect_fails(
 	$common_connstr,
 	"user=anotheruser sslcert=ssl/client.crt sslkey=ssl/client_tmp.key",
-	qr/certificate authentication failed for user "anotheruser"/,
+	qr/unable to verify certificate|certificate authentication failed for user "anotheruser"/,
 	"certificate authorization fails with client cert belonging to another user"
 );
 
+$common_connstr =
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client-revoked.crt__client-revoked.key.db";
+
 # revoked client cert
 test_connect_fails(
 	$common_connstr,
@@ -510,7 +576,7 @@ test_connect_fails(
 # works, iff username matches Common Name
 # fails, iff username doesn't match Common Name.
 $common_connstr =
-  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=verifydb hostaddr=$SERVERHOSTADDR";
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=verifydb hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client.crt__client.key.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -536,17 +602,23 @@ test_connect_ok(
 # intermediate client_ca.crt is provided by client, and isn't in server's ssl_ca_file
 switch_server_cert($node, 'server-cn-only', 'root_ca');
 $common_connstr =
-  "user=ssltestuser dbname=certdb sslkey=ssl/client_tmp.key sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR";
+  "user=ssltestuser dbname=certdb sslkey=ssl/client_tmp.key sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client+client_ca.crt__client.key.db";
 
-test_connect_ok(
+TODO:
+{
+	local $TODO = "WIP failure cause currently unknown";
+	test_connect_ok(
+		$common_connstr,
+		"sslmode=require sslcert=ssl/client+client_ca.crt",
+		"intermediate client certificate is provided by client");
+}
+
+test_connect_fails(
 	$common_connstr,
-	"sslmode=require sslcert=ssl/client+client_ca.crt",
-	"intermediate client certificate is provided by client");
-test_connect_fails($common_connstr, "sslmode=require sslcert=ssl/client.crt",
-	qr/SSL error/, "intermediate client certificate is missing");
+	"sslmode=require sslcert=ssl/client.crt",
+	qr/connection requires a valid client certificate|SSL error/,
+	"intermediate client certificate is missing");
 
 # clean up
-foreach my $key (@keys)
-{
-	unlink("ssl/${key}_tmp.key");
-}
+
+SSL::Server::cleanup();
diff --git a/src/test/ssl/t/002_scram.pl b/src/test/ssl/t/002_scram.pl
index a088f71a1a..cf5714e544 100644
--- a/src/test/ssl/t/002_scram.pl
+++ b/src/test/ssl/t/002_scram.pl
@@ -11,24 +11,39 @@ use File::Copy;
 use FindBin;
 use lib $FindBin::RealBin;
 
-use SSLServer;
+use SSL::Server;
 
-if ($ENV{with_openssl} ne 'yes')
+my $openssl;
+my $nss;
+
+my $supports_tls_server_end_point;
+
+if ($ENV{with_ssl} eq 'no')
 {
 	plan skip_all => 'SSL not supported by this build';
 }
+else
+{
+	if ($ENV{with_ssl} eq 'openssl')
+	{
+		$openssl = 1;
+		# Determine whether build supports tls-server-end-point.
+		$supports_tls_server_end_point =
+			check_pg_config("#define HAVE_X509_GET_SIGNATURE_NID 1");
+		plan tests => $supports_tls_server_end_point ? 9 : 10;
+	}
+	elsif ($ENV{with_ssl} eq 'nss')
+	{
+		$nss = 1;
+		plan tests => 8;
+	}
+}
 
 # This is the hostname used to connect to the server.
 my $SERVERHOSTADDR = '127.0.0.1';
 # This is the pattern to use in pg_hba.conf to match incoming connections.
 my $SERVERHOSTCIDR = '127.0.0.1/32';
 
-# Determine whether build supports tls-server-end-point.
-my $supports_tls_server_end_point =
-  check_pg_config("#define HAVE_X509_GET_SIGNATURE_NID 1");
-
-my $number_of_tests = $supports_tls_server_end_point ? 9 : 10;
-
 # Allocation of base connection string shared among multiple tests.
 my $common_connstr;
 
@@ -66,20 +81,25 @@ test_connect_ok(
 	$common_connstr,
 	"user=ssltestuser channel_binding=disable",
 	"SCRAM with SSL and channel_binding=disable");
-if ($supports_tls_server_end_point)
-{
-	test_connect_ok(
-		$common_connstr,
-		"user=ssltestuser channel_binding=require",
-		"SCRAM with SSL and channel_binding=require");
-}
-else
+
+SKIP:
 {
-	test_connect_fails(
-		$common_connstr,
-		"user=ssltestuser channel_binding=require",
-		qr/channel binding is required, but server did not offer an authentication method that supports channel binding/,
-		"SCRAM with SSL and channel_binding=require");
+	skip "NSS support for TLS server endpoing is not implemented", 1 if ($nss);
+	if ($supports_tls_server_end_point)
+	{
+		test_connect_ok(
+			$common_connstr,
+			"user=ssltestuser channel_binding=require",
+			"SCRAM with SSL and channel_binding=require");
+	}
+	else
+	{
+		test_connect_fails(
+			$common_connstr,
+			"user=ssltestuser channel_binding=require",
+			qr/channel binding is required, but server did not offer an authentication method that supports channel binding/,
+			"SCRAM with SSL and channel_binding=require");
+	}
 }
 
 # Now test when the user has an MD5-encrypted password; should fail
@@ -89,20 +109,21 @@ test_connect_fails(
 	qr/channel binding required but not supported by server's authentication request/,
 	"MD5 with SSL and channel_binding=require");
 
-# Now test with auth method 'cert' by connecting to 'certdb'. Should fail,
-# because channel binding is not performed.  Note that ssl/client.key may
-# be used in a different test, so the name of this temporary client key
-# is chosen here to be unique.
-my $client_tmp_key = "ssl/client_scram_tmp.key";
-copy("ssl/client.key", $client_tmp_key);
-chmod 0600, $client_tmp_key;
-test_connect_fails(
-	"sslcert=ssl/client.crt sslkey=$client_tmp_key sslrootcert=invalid hostaddr=$SERVERHOSTADDR",
-	"dbname=certdb user=ssltestuser channel_binding=require",
-	qr/channel binding required, but server authenticated client without channel binding/,
-	"Cert authentication and channel_binding=require");
-
-# clean up
-unlink($client_tmp_key);
-
-done_testing($number_of_tests);
+SKIP:
+{
+	skip "NSS support not implemented yet", 1 if ($nss);
+	# Now test with auth method 'cert' by connecting to 'certdb'. Should fail,
+	# because channel binding is not performed.  Note that ssl/client.key may
+	# be used in a different test, so the name of this temporary client key
+	# is chosen here to be unique.
+	my $client_tmp_key = "ssl/client_scram_tmp.key";
+	copy("ssl/client.key", $client_tmp_key);
+	chmod 0600, $client_tmp_key;
+	test_connect_fails(
+		"sslcert=ssl/client.crt sslkey=$client_tmp_key sslrootcert=invalid hostaddr=$SERVERHOSTADDR",
+		"dbname=certdb user=ssltestuser channel_binding=require",
+		qr/channel binding required, but server authenticated client without channel binding/,
+		"Cert authentication and channel_binding=require");
+	# clean up
+	unlink($client_tmp_key);
+}
diff --git a/src/test/ssl/t/SSL/Backend/NSS.pm b/src/test/ssl/t/SSL/Backend/NSS.pm
new file mode 100644
index 0000000000..c5b31e584a
--- /dev/null
+++ b/src/test/ssl/t/SSL/Backend/NSS.pm
@@ -0,0 +1,73 @@
+package SSL::Backend::NSS;
+
+use strict;
+use warnings;
+use Exporter;
+
+our @ISA       = qw(Exporter);
+our @EXPORT_OK = qw(get_new_nss_backend);
+
+sub new
+{
+	my ($class) = @_;
+
+	my $self = { _library => 'NSS' };
+
+	bless $self, $class;
+
+	return $self;
+}
+
+sub get_new_nss_backend
+{
+	my $class = 'SSL::Backend::NSS';
+
+	return $class->new();
+}
+
+sub init
+{
+	# Make sure the certificate databases are in place?
+}
+
+sub get_library
+{
+	my ($self) = @_;
+
+	return $self->{_library};
+}
+
+sub set_server_cert
+{
+	my $self     = $_[0];
+	my $certfile = $_[1];
+	my $cafile   = $_[2];
+	my $keyfile  = $_[3];
+
+	my $cert_nickname;
+
+	if ($certfile =~ /native/)
+	{
+		$cert_nickname = $certfile;
+	}
+	else
+	{
+		$cert_nickname = $certfile . '.crt__' . $keyfile . '.key';
+	}
+	my $cert_database = $cert_nickname . '.db';
+
+	my $sslconf =
+	    "ssl_ca_file='$cafile.crt'\n"
+	  . "ssl_cert_file='ssl/$certfile.crt'\n"
+	  . "ssl_crl_file=''\n"
+	  . "ssl_database='nss/$cert_database'\n";
+
+	return $sslconf;
+}
+
+sub cleanup
+{
+	# Something?
+}
+
+1;
diff --git a/src/test/ssl/t/SSL/Backend/OpenSSL.pm b/src/test/ssl/t/SSL/Backend/OpenSSL.pm
new file mode 100644
index 0000000000..62b11b7632
--- /dev/null
+++ b/src/test/ssl/t/SSL/Backend/OpenSSL.pm
@@ -0,0 +1,103 @@
+package SSL::Backend::OpenSSL;
+
+use strict;
+use warnings;
+use Exporter;
+use File::Copy;
+
+our @ISA       = qw(Exporter);
+our @EXPORT_OK = qw(get_new_openssl_backend);
+
+our (@keys);
+
+INIT
+{
+	@keys = (
+		"client",     "client-revoked",
+		"client-der", "client-encrypted-pem",
+		"client-encrypted-der");
+}
+
+sub new
+{
+	my ($class) = @_;
+
+	my $self = { _library => 'OpenSSL' };
+
+	bless $self, $class;
+
+	return $self;
+}
+
+sub get_new_openssl_backend
+{
+	my $class = 'SSL::Backend::OpenSSL';
+
+	my $backend = $class->new();
+
+	return $backend;
+}
+
+sub init
+{
+	# The client's private key must not be world-readable, so take a copy
+	# of the key stored in the code tree and update its permissions.
+	#
+	# This changes ssl/client.key to ssl/client_tmp.key etc for the rest
+	# of the tests.
+	foreach my $key (@keys)
+	{
+		copy("ssl/${key}.key", "ssl/${key}_tmp.key")
+		  or die
+		  "couldn't copy ssl/${key}.key to ssl/${key}_tmp.key for permissions change: $!";
+		chmod 0600, "ssl/${key}_tmp.key"
+		  or die "failed to change permissions on ssl/${key}_tmp.key: $!";
+	}
+
+	# Also make a copy of that explicitly world-readable.  We can't
+	# necessarily rely on the file in the source tree having those
+	# permissions. Add it to @keys to include it in the final clean
+	# up phase.
+	copy("ssl/client.key", "ssl/client_wrongperms_tmp.key")
+	  or die
+	  "couldn't copy ssl/client.key to ssl/client_wrongperms_tmp.key: $!";
+	chmod 0644, "ssl/client_wrongperms_tmp.key"
+	  or die
+	  "failed to change permissions on ssl/client_wrongperms_tmp.key: $!";
+	push @keys, 'client_wrongperms';
+}
+
+# Change the configuration to use given server cert file, and reload
+# the server so that the configuration takes effect.
+sub set_server_cert
+{
+	my $self     = $_[0];
+	my $certfile = $_[1];
+	my $cafile   = $_[2] || "root+client_ca";
+	my $keyfile  = $_[3] || $certfile;
+
+	my $sslconf =
+	    "ssl_ca_file='$cafile.crt'\n"
+	  . "ssl_cert_file='$certfile.crt'\n"
+	  . "ssl_key_file='$keyfile.key'\n"
+	  . "ssl_crl_file='root+client.crl'\n";
+
+	return $sslconf;
+}
+
+sub get_library
+{
+	my ($self) = @_;
+
+	return $self->{_library};
+}
+
+sub cleanup
+{
+	foreach my $key (@keys)
+	{
+		unlink("ssl/${key}_tmp.key");
+	}
+}
+
+1;
diff --git a/src/test/ssl/t/SSLServer.pm b/src/test/ssl/t/SSL/Server.pm
similarity index 78%
rename from src/test/ssl/t/SSLServer.pm
rename to src/test/ssl/t/SSL/Server.pm
index f5987a003e..ee901855b5 100644
--- a/src/test/ssl/t/SSLServer.pm
+++ b/src/test/ssl/t/SSL/Server.pm
@@ -23,19 +23,39 @@
 # explicitly because an invalid sslcert or sslrootcert, respectively,
 # causes those to be ignored.)
 
-package SSLServer;
+package SSL::Server;
 
 use strict;
 use warnings;
 use PostgresNode;
+use RecursiveCopy;
 use TestLib;
 use File::Basename;
 use File::Copy;
 use Test::More;
+use SSL::Backend::OpenSSL qw(get_new_openssl_backend);
+use SSL::Backend::NSS qw(get_new_nss_backend);
+
+our ($openssl, $nss, $backend);
+
+# The TLS backend which the server is using should be mostly transparent for
+# the user, apart from individual configuration settings, so keep the backend
+# specific things abstracted behind SSL::Server.
+if ($ENV{with_ssl} eq 'openssl')
+{
+	$backend = get_new_openssl_backend();
+	$openssl = 1;
+}
+elsif ($ENV{with_ssl} eq 'nss')
+{
+	$backend = get_new_nss_backend();
+	$nss     = 1;
+}
 
 use Exporter 'import';
 our @EXPORT = qw(
   configure_test_server_for_ssl
+  set_server_cert
   switch_server_cert
   test_connect_fails
   test_connect_ok
@@ -144,12 +164,19 @@ sub configure_test_server_for_ssl
 	close $sslconf;
 
 	# Copy all server certificates and keys, and client root cert, to the data dir
-	copy_files("ssl/server-*.crt", $pgdata);
-	copy_files("ssl/server-*.key", $pgdata);
-	chmod(0600, glob "$pgdata/server-*.key") or die $!;
-	copy_files("ssl/root+client_ca.crt", $pgdata);
-	copy_files("ssl/root_ca.crt",        $pgdata);
-	copy_files("ssl/root+client.crl",    $pgdata);
+	if (defined($openssl))
+	{
+		copy_files("ssl/server-*.crt", $pgdata);
+		copy_files("ssl/server-*.key", $pgdata);
+		chmod(0600, glob "$pgdata/server-*.key") or die $!;
+		copy_files("ssl/root+client_ca.crt", $pgdata);
+		copy_files("ssl/root_ca.crt",        $pgdata);
+		copy_files("ssl/root+client.crl",    $pgdata);
+	}
+	elsif (defined($nss))
+	{
+		RecursiveCopy::copypath("ssl/nss", $pgdata . "/nss") if -e "ssl/nss";
+	}
 
 	# Stop and restart server to load new listen_addresses.
 	$node->restart;
@@ -157,26 +184,51 @@ sub configure_test_server_for_ssl
 	# Change pg_hba after restart because hostssl requires ssl=on
 	configure_hba_for_ssl($node, $servercidr, $authmethod);
 
+	# Finally, perform backend specific configuration
+	$backend->init();
+
 	return;
 }
 
-# Change the configuration to use given server cert file, and reload
-# the server so that the configuration takes effect.
-sub switch_server_cert
+sub ssl_library
+{
+	return $backend->get_library();
+}
+
+sub cleanup
+{
+	$backend->cleanup();
+}
+
+# Change the configuration to use given server cert file,
+sub set_server_cert
 {
 	my $node     = $_[0];
 	my $certfile = $_[1];
 	my $cafile   = $_[2] || "root+client_ca";
+	my $keyfile  = $_[3] || '';
+	my $pwcmd    = $_[4] || '';
 	my $pgdata   = $node->data_dir;
 
+	$keyfile = $certfile if $keyfile eq '';
+
 	open my $sslconf, '>', "$pgdata/sslconfig.conf";
 	print $sslconf "ssl=on\n";
-	print $sslconf "ssl_ca_file='$cafile.crt'\n";
-	print $sslconf "ssl_cert_file='$certfile.crt'\n";
-	print $sslconf "ssl_key_file='$certfile.key'\n";
-	print $sslconf "ssl_crl_file='root+client.crl'\n";
+	print $sslconf $backend->set_server_cert($certfile, $cafile, $keyfile);
+	print $sslconf "ssl_passphrase_command='$pwcmd'\n"
+	  unless $pwcmd eq '';
 	close $sslconf;
+	return;
+}
 
+# Change the configuration to use given server cert file, and reload
+# the server so that the configuration takes effect.
+# Takes the same arguments as set_server_cert, which it calls to do that
+# piece of the work.
+sub switch_server_cert
+{
+	my $node = $_[0];
+	set_server_cert(@_);
 	$node->restart;
 	return;
 }
-- 
2.25.1

From 7cb545431b5d392e986c81a6253e44b24fd8b8d1 Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Wed, 28 Oct 2020 11:24:02 +0100
Subject: [PATCH v23 3/6] NSS pg_strong_random support

---
 configure                   |  3 ++-
 configure.ac                |  3 ++-
 src/include/pg_config.h.in  |  3 +++
 src/port/pg_strong_random.c | 50 ++++++++++++++++++++++++++++++++++++-
 4 files changed, 56 insertions(+), 3 deletions(-)

diff --git a/configure b/configure
index cc6088b545..876a0ea839 100755
--- a/configure
+++ b/configure
@@ -18441,6 +18441,7 @@ $as_echo "NSS" >&6; }
 elif test x"$PORTNAME" = x"win32" ; then
   { $as_echo "$as_me:${as_lineno-$LINENO}: result: Windows native" >&5
 $as_echo "Windows native" >&6; }
+
 else
   { $as_echo "$as_me:${as_lineno-$LINENO}: result: /dev/urandom" >&5
 $as_echo "/dev/urandom" >&6; }
@@ -18467,7 +18468,7 @@ fi
   if test x"$ac_cv_file__dev_urandom" = x"no" ; then
     as_fn_error $? "
 no source of strong random numbers was found
-PostgreSQL can use OpenSSL, native Windows API or /dev/urandom as a source of random numbers." "$LINENO" 5
+PostgreSQL can use OpenSSL, NSS, native Windows API or /dev/urandom as a source of random numbers." "$LINENO" 5
   fi
 fi
 
diff --git a/configure.ac b/configure.ac
index 0da8cc9b0b..6b6641a094 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2203,6 +2203,7 @@ elif test x"$with_nss" = x"yes" ; then
   AC_MSG_RESULT([NSS])
 elif test x"$PORTNAME" = x"win32" ; then
   AC_MSG_RESULT([Windows native])
+
 else
   AC_MSG_RESULT([/dev/urandom])
   AC_CHECK_FILE([/dev/urandom], [], [])
@@ -2210,7 +2211,7 @@ else
   if test x"$ac_cv_file__dev_urandom" = x"no" ; then
     AC_MSG_ERROR([
 no source of strong random numbers was found
-PostgreSQL can use OpenSSL, native Windows API or /dev/urandom as a source of random numbers.])
+PostgreSQL can use OpenSSL, NSS, native Windows API or /dev/urandom as a source of random numbers.])
   fi
 fi
 
diff --git a/src/include/pg_config.h.in b/src/include/pg_config.h.in
index 67a9f90e5e..0894ff2bef 100644
--- a/src/include/pg_config.h.in
+++ b/src/include/pg_config.h.in
@@ -908,6 +908,9 @@
 /* Define to build with NSS support (--with-nss) */
 #undef USE_NSS
 
+/* Define to use NSS for random number generation */
+#undef USE_NSS_RANDOM
+
 /* Define to 1 to use software CRC-32C implementation (slicing-by-8). */
 #undef USE_SLICING_BY_8_CRC32C
 
diff --git a/src/port/pg_strong_random.c b/src/port/pg_strong_random.c
index 07f24c0089..40de237628 100644
--- a/src/port/pg_strong_random.c
+++ b/src/port/pg_strong_random.c
@@ -137,7 +137,55 @@ pg_strong_random(void *buf, size_t len)
 	return false;
 }
 
-#else							/* not USE_OPENSSL or WIN32 */
+#elif defined(USE_NSS)
+
+#define pg_BITS_PER_BYTE BITS_PER_BYTE
+#undef BITS_PER_BYTE
+#define NO_NSPR_10_SUPPORT
+#include <nss/nss.h>
+#include <nss/pk11pub.h>
+#if defined(BITS_PER_BYTE)
+#if BITS_PER_BYTE != pg_BITS_PER_BYTE
+#error "incompatible byte widths between NSPR and postgres"
+#endif
+#else
+#define BITS_PER_BYTE pg_BITS_PER_BYTE
+#endif
+#undef pg_BITS_PER_BYTE
+
+void
+pg_strong_random_init(void)
+{
+	/* No initialization needed on NSS */
+}
+
+bool
+pg_strong_random(void *buf, size_t len)
+{
+	NSSInitParameters params;
+	NSSInitContext *nss_context;
+	SECStatus	status;
+
+	memset(&params, 0, sizeof(params));
+	params.length = sizeof(params);
+	nss_context = NSS_InitContext("", "", "", "", &params,
+								  NSS_INIT_READONLY | NSS_INIT_NOCERTDB |
+								  NSS_INIT_NOMODDB | NSS_INIT_FORCEOPEN |
+								  NSS_INIT_NOROOTINIT | NSS_INIT_PK11RELOAD);
+
+	if (!nss_context)
+		return false;
+
+	status = PK11_GenerateRandom(buf, len);
+	NSS_ShutdownContext(nss_context);
+
+	if (status == SECSuccess)
+		return true;
+
+	return false;
+}
+
+#else							/* not USE_OPENSSL, USE_NSS or WIN32 */
 
 /*
  * Without OpenSSL or Win32 support, just read /dev/urandom ourselves.
-- 
2.25.1

From 5d06d659a102948b5d69071749a3b463e354fb1f Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Wed, 28 Oct 2020 11:26:31 +0100
Subject: [PATCH v23 4/6] NSS Documentation

---
 doc/src/sgml/acronyms.sgml     |  43 ++++++++++++
 doc/src/sgml/config.sgml       |  28 +++++++-
 doc/src/sgml/installation.sgml |  30 +++++++-
 doc/src/sgml/libpq.sgml        |  99 +++++++++++++++++++++++++-
 doc/src/sgml/runtime.sgml      | 123 +++++++++++++++++++++++++++++++--
 5 files changed, 311 insertions(+), 12 deletions(-)

diff --git a/doc/src/sgml/acronyms.sgml b/doc/src/sgml/acronyms.sgml
index 4e5ec983c0..7b02c8a622 100644
--- a/doc/src/sgml/acronyms.sgml
+++ b/doc/src/sgml/acronyms.sgml
@@ -441,6 +441,28 @@
     </listitem>
    </varlistentry>
 
+   <varlistentry>
+    <term><acronym>NSPR</acronym></term>
+    <listitem>
+     <para>
+      <ulink
+      url="https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSPR">
+      Netscape Portable Runtime</ulink>
+     </para>
+    </listitem>
+   </varlistentry>
+
+   <varlistentry>
+    <term><acronym>NSS</acronym></term>
+    <listitem>
+     <para>
+      <ulink
+      url="https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS">
+      Network Security Services</ulink>
+     </para>
+    </listitem>
+   </varlistentry>
+
    <varlistentry>
     <term><acronym>ODBC</acronym></term>
     <listitem>
@@ -539,6 +561,17 @@
     </listitem>
    </varlistentry>
 
+   <varlistentry>
+    <term><acronym>PKCS#12</acronym></term>
+    <listitem>
+     <para>
+      <ulink
+      url="https://en.wikipedia.org/wiki/PKCS_12">
+      Public-Key Cryptography Standards #12</ulink>
+     </para>
+    </listitem>
+   </varlistentry>
+
    <varlistentry>
     <term><acronym>PL</acronym></term>
     <listitem>
@@ -684,6 +717,16 @@
     </listitem>
    </varlistentry>
 
+   <varlistentry>
+    <term><acronym>TLS</acronym></term>
+    <listitem>
+     <para>
+      <ulink url="https://en.wikipedia.org/wiki/Transport_Layer_Security">
+      Transport Layer Security</ulink>
+     </para>
+    </listitem>
+   </varlistentry>
+
    <varlistentry>
     <term><acronym>TOAST</acronym></term>
     <listitem>
diff --git a/doc/src/sgml/config.sgml b/doc/src/sgml/config.sgml
index 82864bbb24..6738f8001f 100644
--- a/doc/src/sgml/config.sgml
+++ b/doc/src/sgml/config.sgml
@@ -1236,6 +1236,23 @@ include_dir 'conf.d'
       </listitem>
      </varlistentry>
 
+     <varlistentry id="guc-ssl-database" xreflabel="ssl_database">
+      <term><varname>ssl_database</varname> (<type>string</type>)
+      <indexterm>
+       <primary><varname>ssl_database</varname> configuration parameter</primary>
+      </indexterm>
+      </term>
+      <listitem>
+       <para>
+        Specifies the name of the file containing the server certificates and
+        keys when using <productname>NSS</productname> for <acronym>SSL</acronym>
+        connections. This parameter can only be set in the
+        <filename>postgresql.conf</filename> file or on the server command
+        line.
+       </para>
+      </listitem>
+     </varlistentry>
+
      <varlistentry id="guc-ssl-ciphers" xreflabel="ssl_ciphers">
       <term><varname>ssl_ciphers</varname> (<type>string</type>)
       <indexterm>
@@ -1252,7 +1269,9 @@ include_dir 'conf.d'
         connections using TLS version 1.2 and lower are affected.  There is
         currently no setting that controls the cipher choices used by TLS
         version 1.3 connections.  The default value is
-        <literal>HIGH:MEDIUM:+3DES:!aNULL</literal>.  The default is usually a
+        <literal>HIGH:MEDIUM:+3DES:!aNULL</literal> for servers which have
+        been built with <productname>OpenSSL</productname> as the
+        <acronym>SSL</acronym> library.  The default is usually a
         reasonable choice unless you have specific security requirements.
        </para>
 
@@ -1454,8 +1473,11 @@ include_dir 'conf.d'
        <para>
         Sets an external command to be invoked when a passphrase for
         decrypting an SSL file such as a private key needs to be obtained.  By
-        default, this parameter is empty, which means the built-in prompting
-        mechanism is used.
+        default, this parameter is empty. When the server is using
+        <productname>OpenSSL</productname>, this means the built-in prompting
+        mechanism is used. When using <productname>NSS</productname>, there is
+        no default prompting so a blank callback will be used returning an
+        empty password.
        </para>
        <para>
         The command must print the passphrase to the standard output and exit
diff --git a/doc/src/sgml/installation.sgml b/doc/src/sgml/installation.sgml
index 0ac1cb9999..bd09124fb0 100644
--- a/doc/src/sgml/installation.sgml
+++ b/doc/src/sgml/installation.sgml
@@ -250,7 +250,7 @@ su - postgres
 
     <listitem>
      <para>
-      You need <productname>OpenSSL</productname>, if you want to support
+      You need a supported <acronym>SSL</acronym> library, if you want to support
       encrypted client connections.  <productname>OpenSSL</productname> is
       also required for random number generation on platforms that do not
       have <filename>/dev/urandom</filename> (except Windows).  The minimum
@@ -966,6 +966,31 @@ build-postgresql:
        </listitem>
       </varlistentry>
 
+      <varlistentry>
+       <term><option>--with-nss</option>
+       <indexterm>
+        <primary>NSS</primary>
+        <secondary>NSPR</secondary>
+        <seealso>SSL</seealso>
+       </indexterm>
+       </term>
+       <listitem>
+        <para>
+         Build with support for <acronym>SSL</acronym> (encrypted)
+         connections using <productname>NSS</productname>. This requires the
+         <productname>NSS</productname> package to be installed. Additionally,
+         <productname>NSS</productname> requires <productname>NSPR</productname>
+         to be installed. <filename>configure</filename> will check for the
+         required header files and libraries to make sure that your
+         <productname>NSS</productname> installation is sufficient before
+         proceeding.
+        </para>
+        <para>
+         This option is incompatible with <literal>--with-openssl</literal>.
+        </para>
+       </listitem>
+      </varlistentry>
+
       <varlistentry>
        <term><option>--with-openssl</option>
        <indexterm>
@@ -982,6 +1007,9 @@ build-postgresql:
          your <productname>OpenSSL</productname> installation is sufficient
          before proceeding.
         </para>
+        <para>
+         This option is incompatible with <literal>--with-nss</literal>.
+        </para>
        </listitem>
       </varlistentry>
 
diff --git a/doc/src/sgml/libpq.sgml b/doc/src/sgml/libpq.sgml
index 2bb3bf77e4..3225736f56 100644
--- a/doc/src/sgml/libpq.sgml
+++ b/doc/src/sgml/libpq.sgml
@@ -830,6 +830,12 @@ int callback_fn(char *buf, int size, PGconn *conn);
        <function>longjmp(...)</function>, etc. It must return normally.
       </para>
 
+      <para>
+        <function>PQsetSSLKeyPassHook_OpenSSL</function> is only available
+        when the server was compiled with <productname>OpenSSL</productname>
+        support.
+      </para>
+
      </listitem>
     </varlistentry>
 
@@ -846,6 +852,72 @@ PQsslKeyPassHook_OpenSSL_type PQgetSSLKeyPassHook_OpenSSL(void);
 </synopsis>
       </para>
 
+      <para>
+        <function>PQgetSSLKeyPassHook_OpenSSL</function> is only available
+        when the server was compiled with <productname>OpenSSL</productname>
+        support.
+      </para>
+
+     </listitem>
+    </varlistentry>
+
+    <varlistentry id="libpq-pqsetsslkeypasshook-nss">
+     <term><function>PQsetSSLKeyPassHook_nss</function><indexterm><primary>PQsetSSLKeyPassHook_nss</primary></indexterm></term>
+     <listitem>
+      <para>
+       <function>PQsetSSLKeyPassHook_nss</function> lets an application override
+       <application>libpq</application>'s default handling of password protected
+       objects in the <application>NSS</application> database using
+       <xref linkend="libpq-connect-sslpassword"/> or interactive prompting.
+
+<synopsis>
+void PQsetSSLKeyPassHook_nss(PQsslKeyPassHook_nss_type hook);
+</synopsis>
+
+       The application passes a pointer to a callback function with signature:
+<programlisting>
+char *callback_fn(PK11SlotInfo *slot, PRBool retry, void *arg);
+</programlisting>
+       which <application>libpq</application> will call
+       <emphasis>instead of</emphasis> its default
+       <function>PQdefaultSSLKeyPassHook_nss</function> password handler. The
+       callback should determine the password for the token and return a
+       pointer to it. The returned pointer should be allocated with the NSS
+       <function>PORT_Strdup</function> function. The token for which the
+       password is requested is recorded in the slot anc can be identified by
+       calling <function>PK11_GetTokenName</function>. If no password is
+       known, the callback should return <literal>NULL</literal>. The memory
+       will be owned by <productname>NSS</productname> and should not be
+       freed.
+      </para>
+
+      <para>
+        <function>PQsetSSLKeyPassHook_nss</function> is only available
+        when the server was compiled with <productname>NSS</productname>
+        support.
+      </para>
+     </listitem>
+    </varlistentry>
+
+    <varlistentry id="libpq-pqgetsslkeypasshook-nss">
+     <term><function>PQgetSSLKeyPassHook_nss</function><indexterm><primary>PQgetSSLKeyPassHook_nss</primary></indexterm></term>
+     <listitem>
+      <para>
+       <function>PQgetSSLKeyPassHook_nss</function> returns the current
+       <productname>NSS</productname> password hook, or <literal>NULL</literal>
+       if none has been set.
+
+<synopsis>
+PQsslKeyPassHook_nss_type PQgetSSLKeyPassHook_nss(void);
+</synopsis>
+      </para>
+
+      <para>
+        <function>PQgetSSLKeyPassHook_nss</function> is only available
+        when the server was compiled with <productname>nss</productname>
+        support.
+      </para>
+
      </listitem>
     </varlistentry>
 
@@ -2497,6 +2569,8 @@ void *PQsslStruct(const PGconn *conn, const char *struct_name);
       </para>
       <para>
        The struct(s) available depend on the SSL implementation in use.
+      </para>
+      <para>
        For <productname>OpenSSL</productname>, there is one struct,
        available under the name "OpenSSL", and it returns a pointer to the
        <productname>OpenSSL</productname> <literal>SSL</literal> struct.
@@ -2520,9 +2594,14 @@ void *PQsslStruct(const PGconn *conn, const char *struct_name);
 ]]></programlisting>
       </para>
       <para>
-       This structure can be used to verify encryption levels, check server
-       certificates, and more. Refer to the <productname>OpenSSL</productname>
-       documentation for information about this structure.
+       For <productname>NSS</productname>, there is one struct available under
+       the name "NSS", and it returns a pointer to the
+       <productname>NSS</productname> <literal>PRFileDesc</literal>.
+      </para>
+      <para>
+       These structures can be used to verify encryption levels, check server
+       certificates, and more. Refer to the <acronym>SSL</acronym> library
+       documentation for information about these structures.
       </para>
      </listitem>
     </varlistentry>
@@ -2549,6 +2628,10 @@ void *PQgetssl(const PGconn *conn);
        <xref linkend="libpq-PQsslInUse"/> instead, and for more details about the
        connection, use <xref linkend="libpq-PQsslAttribute"/>.
       </para>
+      <para>
+       This function returns <literal>NULL</literal> when <acronym>SSL</acronym>
+       librariaes other than <productname>OpenSSL</productname> are used.
+      </para>
      </listitem>
     </varlistentry>
 
@@ -7982,6 +8065,11 @@ void PQinitOpenSSL(int do_ssl, int do_crypto);
        before first opening a database connection.  Also be sure that you
        have done that initialization before opening a database connection.
       </para>
+
+      <para>
+       This function does nothing when using <productname>NSS</productname> as
+       the <acronym>SSL</acronym> library.
+      </para>
      </listitem>
     </varlistentry>
 
@@ -8008,6 +8096,11 @@ void PQinitSSL(int do_ssl);
        might be preferable for applications that need to work with older
        versions of <application>libpq</application>.
       </para>
+
+      <para>
+       This function does nothing when using <productname>NSS</productname> as
+       the <acronym>SSL</acronym> library.
+      </para>
      </listitem>
     </varlistentry>
    </variablelist>
diff --git a/doc/src/sgml/runtime.sgml b/doc/src/sgml/runtime.sgml
index 283352d3a4..0900ebf28f 100644
--- a/doc/src/sgml/runtime.sgml
+++ b/doc/src/sgml/runtime.sgml
@@ -2183,15 +2183,21 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
 
   <indexterm zone="ssl-tcp">
    <primary>SSL</primary>
+   <secondary>TLS</secondary>
   </indexterm>
 
   <para>
    <productname>PostgreSQL</productname> has native support for using
    <acronym>SSL</acronym> connections to encrypt client/server communications
    for increased security. This requires that
-   <productname>OpenSSL</productname> is installed on both client and
+   a supported TLS library is installed on both client and
    server systems and that support in <productname>PostgreSQL</productname> is
    enabled at build time (see <xref linkend="installation"/>).
+   Supported libraries are <productname>OpenSSL</productname> and
+   <productname>NSS</productname>. The terms <acronym>SSL</acronym> and
+   <acronym>TLS</acronym> are often used interchangeably to mean a secure
+   connection using a <acronym>TLS</acronym> protocol, even though
+   <acronym>SSL</acronym> protocols are no longer supported.
   </para>
 
   <sect2 id="ssl-setup">
@@ -2211,8 +2217,13 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
   </para>
 
   <para>
-   To start in <acronym>SSL</acronym> mode, files containing the server certificate
-   and private key must exist.  By default, these files are expected to be
+   To start in <acronym>SSL</acronym> mode, a server certificate
+   and private key must exist. The below sections on the different libraries
+   will discuss how to configure these.
+  </para>
+   
+  <para>
+   By default, these files are expected to be
    named <filename>server.crt</filename> and <filename>server.key</filename>, respectively, in
    the server's data directory, but other names and locations can be specified
    using the configuration parameters <xref linkend="guc-ssl-cert-file"/>
@@ -2302,6 +2313,18 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
   </note>
   </sect2>
 
+  <sect2 id="ssl-nss-config">
+   <title>NSS Configuration</title>
+
+  <para>
+   <productname>PostgreSQL</productname> will look for certificates and keys
+   in the <productname>NSS</productname> database specified by the parameter
+   <xref linkend="guc-ssl-database"/> in <filename>postgresql.conf</filename>.
+   The parameters for certificate and key filenames are used to identify the
+   nicknames in the database.
+  </para>
+  </sect2>
+
   <sect2 id="ssl-client-certificates">
    <title>Using Client Certificates</title>
 
@@ -2376,7 +2399,7 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
   </sect2>
 
   <sect2 id="ssl-server-files">
-   <title>SSL Server File Usage</title>
+   <title>SSL Server File Parameter Usage</title>
 
    <para>
     <xref linkend="ssl-file-usage"/> summarizes the files that are
@@ -2423,6 +2446,14 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
       <entry>client certificate must not be on this list</entry>
      </row>
 
+     <row>
+      <entry><xref linkend="guc-ssl-database"/></entry>
+      <entry>certificate database</entry>
+      <entry>contains server certificates, keys and revocation lists; only
+      used when <productname>PostgreSQL</productname> is built with support
+      for <productname>NSS</productname>.</entry>
+     </row>
+
     </tbody>
    </tgroup>
   </table>
@@ -2446,7 +2477,7 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
   </sect2>
 
   <sect2 id="ssl-certificate-creation">
-   <title>Creating Certificates</title>
+   <title>Creating Certificates with OpenSSL</title>
 
    <para>
      To create a simple self-signed certificate for the server, valid for 365
@@ -2550,6 +2581,88 @@ openssl x509 -req -in server.csr -text -days 365 \
    </para>
   </sect2>
 
+  <sect2 id="nss-certificate-database">
+   <title>NSS Certificate Databases</title>
+
+   <para>
+    When using <productname>NSS</productname>, all certificates and keys must
+    be loaded into an <productname>NSS</productname> certificate database.
+   </para>
+
+   <para>
+    To create a new <productname>NSS</productname> certificate database and
+    load the certificates created in <xref linkend="ssl-certificate-creation" />,
+    use the following <productname>NSS</productname> commands:
+<programlisting>
+certutil -d "sql:server.db" -N --empty-password
+certutil -d "sql:server.db" -A -n server.crt -i server.crt -t "CT,C,C"
+certutil -d "sql:server.db" -A -n root.crt -i root.crt -t "CT,C,C"
+</programlisting>
+    This will give the certificate the filename as the nickname identifier in
+    the database which is created as <filename>server.db</filename>.
+   </para>
+   <para>
+    Then load the server key, which require converting it to
+    <acronym>PKCS#12</acronym> format using the
+    <productname>OpenSSL</productname> tools:
+<programlisting>
+openssl pkcs12 -export -out server.pfx -inkey server.key -in server.crt \
+  -certfile root.crt -passout pass:
+pk12util -i server.pfx -d server.db -W ''
+</programlisting>
+   </para>
+   <para>
+    Finally a certificate revocation list can be loaded with the following
+    commands:
+<programlisting>
+crlutil -I -i server.crl -d server.db -B
+</programlisting>
+   </para>
+  </sect2>
+
+  <sect2 id="nss-ssl-certificate-creation" />
+   <title>Creating Certificates with NSS</title>
+
+   <para>
+    To create a simple self-signed CA and certificate for the server, use the
+    following NSS commands. Replace
+    <replaceable>*.yourdomain.com</replaceable> with the server's host
+    name. Remove <replaceable>--empty-password</replaceable> in order to set
+    a password protecting the databases. The password can be passed to
+    <application>certutil</certutil> with the <literal>-f</literal> parameter.
+    First create a self-signed CA. To use a different certificate validity
+    time than the default, use <replaceable>-v</replaceable> to specify the
+    number of months of validity.
+<programlisting>
+mkdir root_ca.db
+certutil -N -d "sql:root_ca.db/" --empty-password
+certutil -S -d "sql:root_ca.db/" -n root_ca -s "CN=<replaceable>ca.yourdomain.com</replaceable>" \
+  -x -k rsa -g 2048 -m <replaceable>5432</replaceable> -t CTu,CTu,CTu \
+  --keyUsage certSigning -2 --nsCertType sslCA,smimeCA,objectSigningCA \
+  -Z SHA256
+certutil -L -d "sql:root_ca.db/" -n root_ca -a > root_ca.pem
+</programlisting>
+    Now create a server certificate database, and create a certificate signing
+    request for the CA. Then sign the request with the already created CA and
+    insert the certificate chain into the certificate database.
+<programlisting>
+mkdir server_cert.db
+certutil -N -d "sql:server_cert.db/" --empty-password
+certutil -R -d "sql:server_cert.db/" -s "CN=dbhost.yourdomain.com" \
+  -o server_cert.csr -g 2048 -Z SHA256
+
+certutil -C -d "sql:root_ca.db/" -c root_ca -i server_cert.csr \
+  -o server_cert.der -m <replaceable>5433</replaceable> \
+  --keyUsage keyEncipherment,dataEncipherment,digitalSignature \
+  --nsCertType sslServer -Z SHA256
+
+certutil -A -d "sql:server_cert.db/" -n root_ca -t CTu,CTu,CTu -a -i root_ca.pem
+certutil -A -d "sql:server_cert.db/" -n server_cert -t CTu,CTu,CTu -i server_cert.der
+</programlisting>
+    The server certificate is loaded into the certificate database as well as
+    the CA certificate in order to provide the chain of certificates.
+  </sect2>
+
  </sect1>
 
  <sect1 id="gssapi-enc">
-- 
2.25.1

From 7cd09cd97fab9db08c1cc4079f718545da163076 Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Wed, 28 Oct 2020 11:34:37 +0100
Subject: [PATCH v23 5/6] NSS contrib modules

---
 contrib/Makefile            |   2 +-
 contrib/pgcrypto/Makefile   |   7 +-
 contrib/pgcrypto/nss.c      | 773 ++++++++++++++++++++++++++++++++++++
 contrib/sslinfo/sslinfo.c   |  32 ++
 doc/src/sgml/pgcrypto.sgml  |  38 +-
 doc/src/sgml/sslinfo.sgml   |  12 +-
 src/tools/msvc/Install.pm   |   3 +-
 src/tools/msvc/Mkvcbuild.pm |  12 +-
 8 files changed, 864 insertions(+), 15 deletions(-)
 create mode 100644 contrib/pgcrypto/nss.c

diff --git a/contrib/Makefile b/contrib/Makefile
index 7a4866e338..c2232e5a4d 100644
--- a/contrib/Makefile
+++ b/contrib/Makefile
@@ -52,7 +52,7 @@ SUBDIRS = \
 		unaccent	\
 		vacuumlo
 
-ifeq ($(with_openssl),yes)
+ifneq ($(with_ssl),no)
 SUBDIRS += sslinfo
 else
 ALWAYS_SUBDIRS += sslinfo
diff --git a/contrib/pgcrypto/Makefile b/contrib/pgcrypto/Makefile
index d881e85add..6f804bf032 100644
--- a/contrib/pgcrypto/Makefile
+++ b/contrib/pgcrypto/Makefile
@@ -7,11 +7,14 @@ INT_TESTS = sha2
 OSSL_SRCS = openssl.c pgp-mpi-openssl.c
 OSSL_TESTS = sha2 des 3des cast5
 
+NSS_SRCS = nss.c pgp-mpi-internal.c imath.c blf.c
+NSS_TESTS = sha2 des 3des
+
 ZLIB_TST = pgp-compression
 ZLIB_OFF_TST = pgp-zlib-DISABLED
 
-CF_SRCS = $(if $(subst no,,$(with_openssl)), $(OSSL_SRCS), $(INT_SRCS))
-CF_TESTS = $(if $(subst no,,$(with_openssl)), $(OSSL_TESTS), $(INT_TESTS))
+CF_SRCS = $(if $(findstring openssl, $(with_ssl)), $(OSSL_SRCS), $(if $(findstring nss, $(with_ssl)), $(NSS_SRCS), $(INT_SRCS)))
+CF_TESTS = $(if $(findstring openssl, $(with_ssl)), $(OSSL_TESTS), $(if $(findstring nss, $(with_ssl)), $(NSS_TESTS), $(INT_TESTS)))
 CF_PGP_TESTS = $(if $(subst no,,$(with_zlib)), $(ZLIB_TST), $(ZLIB_OFF_TST))
 
 SRCS = \
diff --git a/contrib/pgcrypto/nss.c b/contrib/pgcrypto/nss.c
new file mode 100644
index 0000000000..da66152d65
--- /dev/null
+++ b/contrib/pgcrypto/nss.c
@@ -0,0 +1,773 @@
+/*-------------------------------------------------------------------------
+ *
+ * nss.c
+ *	  Wrapper for using NSS as a backend for pgcrypto PX
+ *
+ *
+ * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ *	  contrib/pgcrypto/nss.c
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#include "postgres.h"
+
+#include "px.h"
+#include "blf.h"
+#include "utils/memutils.h"
+
+/*
+ * BITS_PER_BYTE is also defined in the NSPR header files, so we need to undef
+ * our version to avoid compiler warnings on redefinition.
+ */
+#define pg_BITS_PER_BYTE BITS_PER_BYTE
+#undef BITS_PER_BYTE
+
+#include <nss/nss.h>
+#include <nss/hasht.h>
+#include <nss/pk11func.h>
+#include <nss/pk11pub.h>
+#include <nss/secitem.h>
+#include <nss/sechash.h>
+#include <nss/secoid.h>
+#include <nss/secerr.h>
+
+/*
+ * Ensure that the colliding definitions match, else throw an error. In case
+ * NSPR has removed the definition for some reason, make sure to put ours
+ * back again.
+ */
+#if defined(BITS_PER_BYTE)
+#if BITS_PER_BYTE != pg_BITS_PER_BYTE
+#error "incompatible byte widths between NSPR and postgres"
+#endif
+#else
+#define BITS_PER_BYTE pg_BITS_PER_BYTE
+#endif
+#undef pg_BITS_PER_BYTE
+
+/*
+ * Define our own mechanisms for Blowfish as it's not implemented by NSS.
+ */
+#define BLOWFISH_CBC	(1)
+#define BLOWFISH_ECB	(2)
+
+/*
+ * Data structures for recording cipher implementations as well as ongoing
+ * cipher operations.
+ */
+typedef struct nss_digest
+{
+	NSSInitContext *context;
+	PK11Context *hash_context;
+	HASH_HashType hash_type;
+}			nss_digest;
+
+typedef struct cipher_implementation
+{
+	/* Function pointers to cipher operations */
+	int			(*init) (PX_Cipher *pxc, const uint8 *key, unsigned klen, const uint8 *iv);
+	unsigned	(*get_block_size) (PX_Cipher *pxc);
+	unsigned	(*get_key_size) (PX_Cipher *pxc);
+	unsigned	(*get_iv_size) (PX_Cipher *pxc);
+	int			(*encrypt) (PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res);
+	int			(*decrypt) (PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res);
+	void		(*free) (PX_Cipher *pxc);
+
+	/* The mechanism describing the cipher used */
+	union
+	{
+		CK_MECHANISM_TYPE nss;
+		CK_ULONG	internal;
+	}			mechanism;
+	int			keylen;
+	bool		is_nss;
+}			cipher_implementation;
+
+typedef struct nss_cipher
+{
+	const cipher_implementation *impl;
+	NSSInitContext *context;
+	PK11Context *crypt_context;
+	SECItem    *params;
+
+	PK11SymKey *encrypt_key;
+	PK11SymKey *decrypt_key;
+}			nss_cipher;
+
+typedef struct internal_cipher
+{
+	const cipher_implementation *impl;
+	BlowfishContext context;
+}			internal_cipher;
+
+typedef struct nss_cipher_ref
+{
+	const char *name;
+	const cipher_implementation *impl;
+}			nss_cipher_ref;
+
+/*
+ * Prototypes
+ */
+static unsigned nss_get_iv_size(PX_Cipher *pxc);
+static unsigned nss_get_block_size(PX_Cipher *pxc);
+
+/*
+ * nss_GetHashOidTagByHashType
+ *
+ * Returns the corresponding SECOidTag for the passed hash type. NSS 3.43
+ * includes HASH_GetHashOidTagByHashType for this purpose, but at the time of
+ * writing is not commonly available so we need our own version till then.
+ */
+static SECOidTag
+nss_GetHashOidTagByHashType(HASH_HashType type)
+{
+	if (type == HASH_AlgMD2)
+		return SEC_OID_MD2;
+	if (type == HASH_AlgMD5)
+		return SEC_OID_MD5;
+	if (type == HASH_AlgSHA1)
+		return SEC_OID_SHA1;
+	if (type == HASH_AlgSHA224)
+		return SEC_OID_SHA224;
+	if (type == HASH_AlgSHA256)
+		return SEC_OID_SHA256;
+	if (type == HASH_AlgSHA384)
+		return SEC_OID_SHA384;
+	if (type == HASH_AlgSHA512)
+		return SEC_OID_SHA512;
+
+	return SEC_OID_UNKNOWN;
+}
+
+static unsigned
+nss_digest_block_size(PX_MD *pxmd)
+{
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+	const SECHashObject *object;
+
+	object = HASH_GetHashObject(digest->hash_type);
+	return object->blocklength;
+}
+
+static unsigned
+nss_digest_result_size(PX_MD *pxmd)
+{
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+	const SECHashObject *object;
+
+	object = HASH_GetHashObject(digest->hash_type);
+	return object->length;
+}
+
+static void
+nss_digest_free(PX_MD *pxmd)
+{
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+	PRBool		free_ctx = PR_TRUE;
+
+	PK11_DestroyContext(digest->hash_context, free_ctx);
+	NSS_ShutdownContext(digest->context);
+}
+
+static void
+nss_digest_update(PX_MD *pxmd, const uint8 *data, unsigned dlen)
+{
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+
+	PK11_DigestOp(digest->hash_context, data, dlen);
+}
+
+static void
+nss_digest_reset(PX_MD *pxmd)
+{
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+
+	PK11_DigestBegin(digest->hash_context);
+}
+
+static void
+nss_digest_finish(PX_MD *pxmd, uint8 *dst)
+{
+	unsigned int outlen;
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+	const SECHashObject *object;
+
+	object = HASH_GetHashObject(digest->hash_type);
+	PK11_DigestFinal(digest->hash_context, dst, &outlen, object->length);
+}
+
+int
+px_find_digest(const char *name, PX_MD **res)
+{
+	PX_MD	   *pxmd;
+	NSSInitParameters params;
+	NSSInitContext *nss_context;
+	bool		found = false;
+	nss_digest *digest;
+	SECStatus	status;
+	SECOidData *hash;
+	HASH_HashType t;
+
+	/*
+	 * Initialize our own NSS context without a database backing it.
+	 */
+	memset(&params, 0, sizeof(params));
+	params.length = sizeof(params);
+	nss_context = NSS_InitContext("", "", "", "", &params,
+								  NSS_INIT_READONLY | NSS_INIT_NOCERTDB |
+								  NSS_INIT_NOMODDB | NSS_INIT_FORCEOPEN |
+								  NSS_INIT_NOROOTINIT | NSS_INIT_PK11RELOAD);
+
+	/*
+	 * There is no API function for looking up a digest algorithm from a name
+	 * string, but there is a publicly accessible array which can be scanned
+	 * for the name.
+	 */
+	for (t = HASH_AlgNULL + 1; t < HASH_AlgTOTAL; t++)
+	{
+		SECOidTag	hash_oid;
+		char	   *p;
+
+		hash_oid = nss_GetHashOidTagByHashType(t);
+
+		if (hash_oid == SEC_OID_UNKNOWN)
+			return PXE_NO_HASH;
+
+		hash = SECOID_FindOIDByTag(hash_oid);
+		if (pg_strcasecmp(hash->desc, name) == 0)
+		{
+			found = true;
+			break;
+		}
+
+		/*
+		 * NSS saves the algorithm names using SHA-xxx notation whereas
+		 * OpenSSL use SHAxxx. To make sure the user finds the requested
+		 * algorithm let's remove the dash and compare that spelling as well.
+		 */
+		if ((p = strchr(hash->desc, '-')) != NULL)
+		{
+			char		tmp[12];
+
+			memcpy(tmp, hash->desc, p - hash->desc);
+			memcpy(tmp + (p - hash->desc), p + 1, strlen(hash->desc) - (p - hash->desc) + 1);
+			if (pg_strcasecmp(tmp, name) == 0)
+			{
+				found = true;
+				break;
+			}
+		}
+	}
+
+	if (!found)
+		return PXE_NO_HASH;
+
+	digest = palloc(sizeof(*digest));
+
+	digest->context = nss_context;
+	digest->hash_context = PK11_CreateDigestContext(hash->offset);
+	digest->hash_type = t;
+	if (digest->hash_context == NULL)
+	{
+		pfree(digest);
+		return -1;
+	}
+
+	status = PK11_DigestBegin(digest->hash_context);
+	if (status != SECSuccess)
+	{
+		PK11_DestroyContext(digest->hash_context, PR_TRUE);
+		pfree(digest);
+		return -1;
+	}
+
+	pxmd = palloc(sizeof(*pxmd));
+	pxmd->result_size = nss_digest_result_size;
+	pxmd->block_size = nss_digest_block_size;
+	pxmd->reset = nss_digest_reset;
+	pxmd->update = nss_digest_update;
+	pxmd->finish = nss_digest_finish;
+	pxmd->free = nss_digest_free;
+	pxmd->p.ptr = (void *) digest;
+
+	*res = pxmd;
+
+	return 0;
+}
+
+static int
+bf_init(PX_Cipher *pxc, const uint8 *key, unsigned klen, const uint8 *iv)
+{
+	internal_cipher *cipher = (internal_cipher *) pxc->ptr;
+
+	blowfish_setkey(&cipher->context, key, klen);
+	if (iv)
+		blowfish_setiv(&cipher->context, iv);
+
+	return 0;
+}
+
+static int
+bf_encrypt(PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res)
+{
+	internal_cipher *cipher = (internal_cipher *) pxc->ptr;
+	uint8	   *buf;
+
+	if (dlen == 0)
+		return 0;
+
+	if (dlen & 7)
+		return PXE_NOTBLOCKSIZE;
+
+	buf = palloc(dlen);
+	memcpy(buf, data, dlen);
+
+	if (cipher->impl->mechanism.internal == BLOWFISH_ECB)
+		blowfish_encrypt_ecb(buf, dlen, &cipher->context);
+	else
+		blowfish_encrypt_cbc(buf, dlen, &cipher->context);
+
+	memcpy(res, buf, dlen);
+	pfree(buf);
+
+	return 0;
+}
+
+static int
+bf_decrypt(PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res)
+{
+	internal_cipher *cipher = (internal_cipher *) pxc->ptr;
+
+	if (dlen == 0)
+		return 0;
+
+	if (dlen & 7)
+		return PXE_NOTBLOCKSIZE;
+
+	memcpy(res, data, dlen);
+	if (cipher->impl->mechanism.internal == BLOWFISH_ECB)
+		blowfish_decrypt_ecb(res, dlen, &cipher->context);
+	else
+		blowfish_decrypt_cbc(res, dlen, &cipher->context);
+
+	return 0;
+}
+
+static void
+bf_free(PX_Cipher *pxc)
+{
+	internal_cipher *cipher = (internal_cipher *) pxc->ptr;
+
+	pfree(cipher);
+	pfree(pxc);
+}
+
+static int
+nss_symkey_blockcipher_init(PX_Cipher *pxc, const uint8 *key, unsigned klen,
+							const uint8 *iv)
+{
+	nss_cipher *cipher = (nss_cipher *) pxc->ptr;
+	SECItem		iv_item;
+	unsigned char *iv_item_data;
+	SECItem		key_item;
+	int			keylen;
+	PK11SlotInfo *slot;
+
+	if (cipher->impl->mechanism.nss == CKM_AES_CBC ||
+		cipher->impl->mechanism.nss == CKM_AES_ECB)
+	{
+		if (klen <= 128 / 8)
+			keylen = 128 / 8;
+		else if (klen <= 192 / 8)
+			keylen = 192 / 8;
+		else if (klen <= 256 / 8)
+			keylen = 256 / 8;
+		else
+			return PXE_CIPHER_INIT;
+	}
+	else
+		keylen = cipher->impl->keylen;
+
+	key_item.type = siBuffer;
+	key_item.data = (unsigned char *) key;
+	key_item.len = keylen;
+
+	/*
+	 * If hardware acceleration is configured in NSS one can theoretically get
+	 * a better slot by calling PK11_GetBestSlot() with the mechanism passed
+	 * to it. Unless there are complaints, using the simpler API will make
+	 * error handling easier though.
+	 */
+	slot = PK11_GetInternalSlot();
+	if (!slot)
+		return PXE_CIPHER_INIT;
+
+	/*
+	 * The key must be set up for the operation, and since we don't know at
+	 * this point whether we are asked to encrypt or decrypt we need to store
+	 * both versions.
+	 */
+	cipher->decrypt_key = PK11_ImportSymKey(slot, cipher->impl->mechanism.nss,
+											PK11_OriginUnwrap,
+											CKA_DECRYPT, &key_item,
+											NULL);
+	cipher->encrypt_key = PK11_ImportSymKey(slot, cipher->impl->mechanism.nss,
+											PK11_OriginUnwrap,
+											CKA_ENCRYPT, &key_item,
+											NULL);
+	PK11_FreeSlot(slot);
+
+	if (!cipher->decrypt_key || !cipher->encrypt_key)
+		return PXE_CIPHER_INIT;
+
+	if (iv)
+	{
+		iv_item.type = siBuffer;
+		iv_item.data = (unsigned char *) iv;
+		iv_item.len = nss_get_iv_size(pxc);
+	}
+	else
+	{
+		/*
+		 * The documentation states that either passing .data = 0; .len = 0;
+		 * in the iv_item, or NULL as iv_item, to PK11_ParamFromIV should be
+		 * done when IV is missing. That however leads to segfaults in the
+		 * library, the workaround that works in modern  library versions is
+		 * to pass in a keysized zeroed out IV.
+		 */
+		iv_item_data = palloc0(nss_get_iv_size(pxc));
+		iv_item.type = siBuffer;
+		iv_item.data = iv_item_data;
+		iv_item.len = nss_get_iv_size(pxc);
+	}
+
+	cipher->params = PK11_ParamFromIV(cipher->impl->mechanism.nss, &iv_item);
+
+	/* If we had to make a mock IV, free it once made into a param */
+	if (!iv)
+		pfree(iv_item_data);
+
+	if (cipher->params == NULL)
+		return PXE_CIPHER_INIT;
+
+	return 0;
+}
+
+static int
+nss_decrypt(PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res)
+{
+	nss_cipher *cipher = (nss_cipher *) pxc->ptr;
+	SECStatus	status;
+	int			outlen;
+
+	if (!cipher->crypt_context)
+	{
+		cipher->crypt_context =
+			PK11_CreateContextBySymKey(cipher->impl->mechanism.nss, CKA_DECRYPT,
+									   cipher->decrypt_key, cipher->params);
+	}
+
+	status = PK11_CipherOp(cipher->crypt_context, res, &outlen, dlen, data, dlen);
+	if (status != SECSuccess)
+		return PXE_DECRYPT_FAILED;
+
+	return 0;
+}
+
+static int
+nss_encrypt(PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res)
+{
+	nss_cipher *cipher = (nss_cipher *) pxc->ptr;
+	SECStatus	status;
+	int			outlen;
+
+	if (!cipher->crypt_context)
+	{
+		cipher->crypt_context =
+			PK11_CreateContextBySymKey(cipher->impl->mechanism.nss, CKA_ENCRYPT,
+									   cipher->decrypt_key, cipher->params);
+	}
+
+	status = PK11_CipherOp(cipher->crypt_context, res, &outlen, dlen, data, dlen);
+
+	if (status != SECSuccess)
+		return PXE_DECRYPT_FAILED;
+
+	return 0;
+}
+
+static void
+nss_free(PX_Cipher *pxc)
+{
+	nss_cipher *cipher = pxc->ptr;
+	PRBool		free_ctx = PR_TRUE;
+
+	PK11_FreeSymKey(cipher->encrypt_key);
+	PK11_FreeSymKey(cipher->decrypt_key);
+	PK11_DestroyContext(cipher->crypt_context, free_ctx);
+	NSS_ShutdownContext(cipher->context);
+	pfree(cipher);
+
+	pfree(pxc);
+}
+
+static unsigned
+nss_get_block_size(PX_Cipher *pxc)
+{
+	nss_cipher *cipher = pxc->ptr;
+
+	return PK11_GetBlockSize(cipher->impl->mechanism.nss, NULL);
+}
+
+static unsigned
+nss_get_key_size(PX_Cipher *pxc)
+{
+	nss_cipher *cipher = pxc->ptr;
+
+	return cipher->impl->keylen;
+}
+
+static unsigned
+nss_get_iv_size(PX_Cipher *pxc)
+{
+	nss_cipher *cipher = pxc->ptr;
+
+	return PK11_GetIVLength(cipher->impl->mechanism.nss);
+}
+
+static unsigned
+bf_get_block_size(PX_Cipher *pxc)
+{
+	return 8;
+}
+
+static unsigned
+bf_get_key_size(PX_Cipher *pxc)
+{
+	return 448 / 8;
+}
+
+static unsigned
+bf_get_iv_size(PX_Cipher *pxc)
+{
+	return 8;
+}
+
+/*
+ * Cipher Implementations
+ */
+static const cipher_implementation nss_des_cbc = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_DES_CBC,
+	.keylen = 8,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_des_ecb = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_DES_ECB,
+	.keylen = 8,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_des3_cbc = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_DES3_CBC,
+	.keylen = 24,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_des3_ecb = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_DES3_ECB,
+	.keylen = 24,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_aes_cbc = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_AES_CBC,
+	.keylen = 32,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_aes_ecb = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_AES_ECB,
+	.keylen = 32,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_bf_ecb = {
+	.init = bf_init,
+	.get_block_size = bf_get_block_size,
+	.get_key_size = bf_get_key_size,
+	.get_iv_size = bf_get_iv_size,
+	.encrypt = bf_encrypt,
+	.decrypt = bf_decrypt,
+	.free = bf_free,
+	.mechanism.internal = BLOWFISH_ECB,
+	.keylen = 56,
+	.is_nss = false
+};
+
+static const cipher_implementation nss_bf_cbc = {
+	.init = bf_init,
+	.get_block_size = bf_get_block_size,
+	.get_key_size = bf_get_key_size,
+	.get_iv_size = bf_get_iv_size,
+	.encrypt = bf_encrypt,
+	.decrypt = bf_decrypt,
+	.free = bf_free,
+	.mechanism.internal = BLOWFISH_CBC,
+	.keylen = 56,
+	.is_nss = false
+};
+
+/*
+ * Lookup table for finding the implementation based on a name. CAST5 as well
+ * as BLOWFISH are defined as cipher mechanisms in NSS but error out with
+ * SEC_ERROR_INVALID_ALGORITHM. Blowfish is implemented using the internal
+ * implementation while CAST5 isn't supported at all at this time,
+ */
+static const nss_cipher_ref nss_cipher_lookup[] = {
+	{"des", &nss_des_cbc},
+	{"des-cbc", &nss_des_cbc},
+	{"des-ecb", &nss_des_ecb},
+	{"des3-cbc", &nss_des3_cbc},
+	{"3des", &nss_des3_cbc},
+	{"3des-cbc", &nss_des3_cbc},
+	{"des3-ecb", &nss_des3_ecb},
+	{"3des-ecb", &nss_des3_ecb},
+	{"aes", &nss_aes_cbc},
+	{"aes-cbc", &nss_aes_cbc},
+	{"aes-ecb", &nss_aes_ecb},
+	{"rijndael", &nss_aes_cbc},
+	{"rijndael-cbc", &nss_aes_cbc},
+	{"rijndael-ecb", &nss_aes_ecb},
+	{"blowfish", &nss_bf_cbc},
+	{"blowfish-cbc", &nss_bf_cbc},
+	{"blowfish-ecb", &nss_bf_ecb},
+	{"bf", &nss_bf_cbc},
+	{"bf-cbc", &nss_bf_cbc},
+	{"bf-ecb", &nss_bf_ecb},
+	{NULL}
+};
+
+/*
+ * px_find_cipher
+ *
+ * Search for the requested cipher and see if there is support for it, and if
+ * so return an allocated object containing the playbook for how to encrypt
+ * and decrypt using the cipher.
+ */
+int
+px_find_cipher(const char *alias, PX_Cipher **res)
+{
+	const nss_cipher_ref *cipher_ref;
+	PX_Cipher  *px_cipher;
+	NSSInitParameters params;
+	NSSInitContext *nss_context;
+	nss_cipher *cipher;
+	internal_cipher *int_cipher;
+
+	for (cipher_ref = nss_cipher_lookup; cipher_ref->name; cipher_ref++)
+	{
+		if (strcmp(cipher_ref->name, alias) == 0)
+			break;
+	}
+
+	if (!cipher_ref->name)
+		return PXE_NO_CIPHER;
+
+	/*
+	 * Fill in the PX_Cipher to pass back to PX describing the operations to
+	 * perform in order to use the cipher.
+	 */
+	px_cipher = palloc(sizeof(*px_cipher));
+	px_cipher->block_size = cipher_ref->impl->get_block_size;
+	px_cipher->key_size = cipher_ref->impl->get_key_size;
+	px_cipher->iv_size = cipher_ref->impl->get_iv_size;
+	px_cipher->free = cipher_ref->impl->free;
+	px_cipher->init = cipher_ref->impl->init;
+	px_cipher->encrypt = cipher_ref->impl->encrypt;
+	px_cipher->decrypt = cipher_ref->impl->decrypt;
+
+	/*
+	 * Set the private data, which is different for NSS and internal ciphers
+	 */
+	if (cipher_ref->impl->is_nss)
+	{
+		/*
+		 * Initialize our own NSS context without a database backing it. At
+		 * some point we might want to allow users to use stored keys in the
+		 * database rather than passing them via SELECT encrypt(), and then
+		 * this need to be changed to open a user specified database.
+		 */
+		memset(&params, 0, sizeof(params));
+		params.length = sizeof(params);
+		nss_context = NSS_InitContext("", "", "", "", &params,
+									  NSS_INIT_READONLY | NSS_INIT_NOCERTDB |
+									  NSS_INIT_NOMODDB | NSS_INIT_FORCEOPEN |
+									  NSS_INIT_NOROOTINIT | NSS_INIT_PK11RELOAD);
+
+		/* nss_cipher is the private state struct for the operation */
+		cipher = palloc(sizeof(*cipher));
+		cipher->context = nss_context;
+		cipher->impl = cipher_ref->impl;
+		cipher->crypt_context = NULL;
+
+		px_cipher->ptr = cipher;
+	}
+	else
+	{
+		int_cipher = palloc0(sizeof(*int_cipher));
+
+		int_cipher->impl = cipher_ref->impl;
+		px_cipher->ptr = int_cipher;
+	}
+
+	*res = px_cipher;
+	return 0;
+}
diff --git a/contrib/sslinfo/sslinfo.c b/contrib/sslinfo/sslinfo.c
index 30cae0bb98..3aadd90aa6 100644
--- a/contrib/sslinfo/sslinfo.c
+++ b/contrib/sslinfo/sslinfo.c
@@ -9,9 +9,11 @@
 
 #include "postgres.h"
 
+#ifdef USE_OPENSSL
 #include <openssl/x509.h>
 #include <openssl/x509v3.h>
 #include <openssl/asn1.h>
+#endif
 
 #include "access/htup_details.h"
 #include "funcapi.h"
@@ -21,6 +23,7 @@
 
 PG_MODULE_MAGIC;
 
+#ifdef USE_OPENSSL
 static Datum X509_NAME_field_to_text(X509_NAME *name, text *fieldName);
 static Datum ASN1_STRING_to_text(ASN1_STRING *str);
 
@@ -31,6 +34,7 @@ typedef struct
 {
 	TupleDesc	tupdesc;
 } SSLExtensionInfoContext;
+#endif
 
 /*
  * Indicates whether current session uses SSL
@@ -131,6 +135,7 @@ ssl_client_serial(PG_FUNCTION_ARGS)
 }
 
 
+#ifdef USE_OPENSSL
 /*
  * Converts OpenSSL ASN1_STRING structure into text
  *
@@ -282,7 +287,23 @@ ssl_issuer_field(PG_FUNCTION_ARGS)
 	else
 		return result;
 }
+#endif							/* USE_OPENSSL */
 
+#ifdef USE_NSS
+PG_FUNCTION_INFO_V1(ssl_client_dn_field);
+Datum
+ssl_client_dn_field(PG_FUNCTION_ARGS)
+{
+	PG_RETURN_NULL();
+}
+
+PG_FUNCTION_INFO_V1(ssl_issuer_field);
+Datum
+ssl_issuer_field(PG_FUNCTION_ARGS)
+{
+	PG_RETURN_NULL();
+}
+#endif							/* USE_NSS */
 
 /*
  * Returns current client certificate subject as one string
@@ -338,6 +359,7 @@ ssl_issuer_dn(PG_FUNCTION_ARGS)
 }
 
 
+#ifdef USE_OPENSSL
 /*
  * Returns information about available SSL extensions.
  *
@@ -471,3 +493,13 @@ ssl_extension_info(PG_FUNCTION_ARGS)
 	/* All done */
 	SRF_RETURN_DONE(funcctx);
 }
+#endif							/* USE_OPENSSL */
+
+#ifdef USE_NSS
+PG_FUNCTION_INFO_V1(ssl_extension_info);
+Datum
+ssl_extension_info(PG_FUNCTION_ARGS)
+{
+	PG_RETURN_NULL();
+}
+#endif							/* USE_NSS */
diff --git a/doc/src/sgml/pgcrypto.sgml b/doc/src/sgml/pgcrypto.sgml
index 3d74e15ec9..9eb8a3f74d 100644
--- a/doc/src/sgml/pgcrypto.sgml
+++ b/doc/src/sgml/pgcrypto.sgml
@@ -45,8 +45,9 @@ digest(data bytea, type text) returns bytea
     <literal>sha224</literal>, <literal>sha256</literal>,
     <literal>sha384</literal> and <literal>sha512</literal>.
     If <filename>pgcrypto</filename> was built with
-    <productname>OpenSSL</productname>, more algorithms are available, as
-    detailed in <xref linkend="pgcrypto-with-without-openssl"/>.
+    <productname>OpenSSL</productname> or <productname>NSS</productname>,
+    more algorithms are available, as
+    detailed in <xref linkend="pgcrypto-with-without-openssl-nss"/>.
    </para>
 
    <para>
@@ -764,7 +765,7 @@ pgp_sym_encrypt(data, psw, 'compress-algo=1, cipher-algo=aes256')
     Which cipher algorithm to use.
    </para>
 <literallayout>
-Values: bf, aes128, aes192, aes256 (OpenSSL-only: <literal>3des</literal>, <literal>cast5</literal>)
+Values: bf, aes128, aes192, aes256 (OpenSSL-only: <literal>3des</literal>, <literal>cast5</literal>; NSS-only: <literal>3des</literal>)
 Default: aes128
 Applies to: pgp_sym_encrypt, pgp_pub_encrypt
 </literallayout>
@@ -1153,8 +1154,8 @@ gen_random_uuid() returns uuid
    <para>
     <filename>pgcrypto</filename> configures itself according to the findings of the
     main PostgreSQL <literal>configure</literal> script.  The options that
-    affect it are <literal>--with-zlib</literal> and
-    <literal>--with-openssl</literal>.
+    affect it are <literal>--with-zlib</literal>,
+    <literal>--with-openssl</literal> and <literal>--with-nss</literal>.
    </para>
 
    <para>
@@ -1169,14 +1170,16 @@ gen_random_uuid() returns uuid
     BIGNUM functions.
    </para>
 
-   <table id="pgcrypto-with-without-openssl">
-    <title>Summary of Functionality with and without OpenSSL</title>
-    <tgroup cols="3">
+   <table id="pgcrypto-with-without-openssl-nss">
+    <title>Summary of Functionality with and without external cryptographic
+      library</title>
+    <tgroup cols="4">
      <thead>
       <row>
        <entry>Functionality</entry>
        <entry>Built-in</entry>
        <entry>With OpenSSL</entry>
+       <entry>With NSS</entry>
       </row>
      </thead>
      <tbody>
@@ -1184,51 +1187,67 @@ gen_random_uuid() returns uuid
        <entry>MD5</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>SHA1</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>SHA224/256/384/512</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>Other digest algorithms</entry>
        <entry>no</entry>
        <entry>yes (Note 1)</entry>
+       <entry>yes (Note 1)</entry>
       </row>
       <row>
        <entry>Blowfish</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>AES</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>DES/3DES/CAST5</entry>
        <entry>no</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
+      </row>
+      <row>
+       <entry>CAST5</entry>
+       <entry>no</entry>
+       <entry>yes</entry>
+       <entry>no</entry>
       </row>
       <row>
        <entry>Raw encryption</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>PGP Symmetric encryption</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>PGP Public-Key encryption</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
      </tbody>
     </tgroup>
@@ -1241,7 +1260,8 @@ gen_random_uuid() returns uuid
    <orderedlist>
     <listitem>
      <para>
-      Any digest algorithm <productname>OpenSSL</productname> supports
+      Any digest algorithm <productname>OpenSSL</productname> and
+      <productname>NSS</productname> supports
       is automatically picked up.
       This is not possible with ciphers, which need to be supported
       explicitly.
diff --git a/doc/src/sgml/sslinfo.sgml b/doc/src/sgml/sslinfo.sgml
index 3213c039ca..d2270cbe7c 100644
--- a/doc/src/sgml/sslinfo.sgml
+++ b/doc/src/sgml/sslinfo.sgml
@@ -22,7 +22,8 @@
 
  <para>
   This extension won't build at all unless the installation was
-  configured with <literal>--with-openssl</literal>.
+  configured with SSL support, such as <literal>--with-openssl</literal>
+  or <literal>--with-nss</literal>.
  </para>
 
  <sect2>
@@ -208,6 +209,9 @@ emailAddress
      the X.500 and X.509 standards, so you cannot just assign arbitrary
      meaning to them.
     </para>
+    <para>
+     This function is only available when using <productname>OpenSSL</productname>.
+    </para>
     </listitem>
    </varlistentry>
 
@@ -223,6 +227,9 @@ emailAddress
      Same as <function>ssl_client_dn_field</function>, but for the certificate issuer
      rather than the certificate subject.
     </para>
+    <para>
+     This function is only available when using <productname>OpenSSL</productname>.
+    </para>
     </listitem>
    </varlistentry>
 
@@ -238,6 +245,9 @@ emailAddress
      Provide information about extensions of client certificate: extension name,
      extension value, and if it is a critical extension.
     </para>
+    <para>
+     This function is only available when using <productname>OpenSSL</productname>.
+    </para>
     </listitem>
    </varlistentry>
   </variablelist>
diff --git a/src/tools/msvc/Install.pm b/src/tools/msvc/Install.pm
index ea3af48777..afe72a7e97 100644
--- a/src/tools/msvc/Install.pm
+++ b/src/tools/msvc/Install.pm
@@ -438,7 +438,8 @@ sub CopyContribFiles
 		{
 			# These configuration-based exclusions must match vcregress.pl
 			next if ($d eq "uuid-ossp"  && !defined($config->{uuid}));
-			next if ($d eq "sslinfo"    && !defined($config->{openssl}));
+			next if ($d eq "sslinfo"    && !defined($config->{openssl})
+			  && !defined($config->{nss}));
 			next if ($d eq "xml2"       && !defined($config->{xml}));
 			next if ($d =~ /_plperl$/   && !defined($config->{perl}));
 			next if ($d =~ /_plpython$/ && !defined($config->{python}));
diff --git a/src/tools/msvc/Mkvcbuild.pm b/src/tools/msvc/Mkvcbuild.pm
index a21eb088b3..0c489f9f34 100644
--- a/src/tools/msvc/Mkvcbuild.pm
+++ b/src/tools/msvc/Mkvcbuild.pm
@@ -444,9 +444,14 @@ sub mkvcbuild
 		push @contrib_excludes, 'xml2';
 	}
 
+	if (!$solution->{options}->{openssl} && !$solution->{options}->{nss})
+	{
+		push @contrib_excludes, 'sslinfo';
+	}
+
 	if (!$solution->{options}->{openssl})
 	{
-		push @contrib_excludes, 'sslinfo', 'ssl_passphrase_callback';
+		push @contrib_excludes, 'ssl_passphrase_callback';
 	}
 
 	if (!$solution->{options}->{uuid})
@@ -476,6 +481,11 @@ sub mkvcbuild
 		$pgcrypto->AddFiles('contrib/pgcrypto', 'openssl.c',
 			'pgp-mpi-openssl.c');
 	}
+	elsif ($solution->{options}->{nss})
+	{
+		$pgcrypto->AddFiles('contrib/pgcrypto', 'nss.c',
+			'pgp-mpi-internal.c', 'imath.c', 'blf.c');
+	}
 	else
 	{
 		$pgcrypto->AddFiles(
-- 
2.25.1

From 1436b8b74f25c7a167cf78e7ef038de02f911bd8 Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Mon, 18 Jan 2021 13:04:49 +0100
Subject: [PATCH v23 6/6] NSS cryptohash support

---
 src/common/Makefile         |   5 +
 src/common/cryptohash_nss.c | 243 ++++++++++++++++++++++++++++++++++++
 2 files changed, 248 insertions(+)
 create mode 100644 src/common/cryptohash_nss.c

diff --git a/src/common/Makefile b/src/common/Makefile
index 7a4b3dad5d..5a25e5b390 100644
--- a/src/common/Makefile
+++ b/src/common/Makefile
@@ -85,11 +85,16 @@ OBJS_COMMON += \
 	protocol_openssl.o \
 	cryptohash_openssl.o
 else
+ifeq ($(with_ssl),nss)
+OBJS_COMMON += \
+	cryptohash_nss.o
+else
 OBJS_COMMON += \
 	cryptohash.o \
 	md5.o \
 	sha2.o
 endif
+endif
 
 # A few files are currently only built for frontend, not server
 # (Mkvcbuild.pm has a copy of this list, too).  logging.c is excluded
diff --git a/src/common/cryptohash_nss.c b/src/common/cryptohash_nss.c
new file mode 100644
index 0000000000..9cd9c9f3f3
--- /dev/null
+++ b/src/common/cryptohash_nss.c
@@ -0,0 +1,243 @@
+/*-------------------------------------------------------------------------
+ *
+ * cryptohash_nss.c
+ *	  Set of wrapper routines on top of NSS to support cryptographic
+ *	  hash functions.
+ *
+ * This should only be used if code is compiled with NSS support.
+ *
+ * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ *		  src/common/cryptohash_nss.c
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#ifndef FRONTEND
+#include "postgres.h"
+#else
+#include "postgres_fe.h"
+#endif
+
+/*
+ * BITS_PER_BYTE is also defined in the NSPR header files, so we need to undef
+ * our version to avoid compiler warnings on redefinition.
+ */
+#define pg_BITS_PER_BYTE BITS_PER_BYTE
+#undef BITS_PER_BYTE
+
+#include <nss/nss.h>
+#include <nss/hasht.h>
+#include <nss/pk11func.h>
+#include <nss/pk11pub.h>
+#include <nss/secitem.h>
+#include <nss/sechash.h>
+#include <nss/secoid.h>
+#include <nss/secerr.h>
+
+/*
+ * Ensure that the colliding definitions match, else throw an error. In case
+ * NSPR has removed the definition for some reason, make sure to put ours
+ * back again.
+ */
+#if defined(BITS_PER_BYTE)
+#if BITS_PER_BYTE != pg_BITS_PER_BYTE
+#error "incompatible byte widths between NSPR and postgres"
+#endif
+#else
+#define BITS_PER_BYTE pg_BITS_PER_BYTE
+#endif
+#undef pg_BITS_PER_BYTE
+
+#include "common/cryptohash.h"
+#ifndef FRONTEND
+#include "utils/memutils.h"
+#include "utils/resowner.h"
+#include "utils/resowner_private.h"
+#endif
+
+/*
+ * Internal pg_cryptohash_ctx structure.
+ */
+struct pg_cryptohash_ctx
+{
+	pg_cryptohash_type type;
+
+	NSSInitContext *nss_context;
+	PK11Context *pk11_context;
+	HASH_HashType hash_type;
+
+#ifndef FRONTEND
+	ResourceOwner resowner;
+#endif
+};
+
+/*
+ * pg_cryptohash_create
+ *
+ * Create and allocate a new hash context. Returns NULL on failure in the
+ * frontend, and raise error without returning in the backend.
+ */
+pg_cryptohash_ctx *
+pg_cryptohash_create(pg_cryptohash_type type)
+{
+	NSSInitParameters params;
+	pg_cryptohash_ctx *ctx;
+	SECOidData *hash;
+
+#ifndef FRONTEND
+	/*
+	 * Make sure that the resource owner has space to remember this reference.
+	 * This can error out with "out of memory", so do this before any other
+	 * allocation to avoid leaking.
+	 */
+	ResourceOwnerEnlargeCryptoHash(CurrentResourceOwner);
+	ctx = MemoryContextAlloc(TopMemoryContext, sizeof(pg_cryptohash_ctx));
+#else
+	ctx = pg_malloc(sizeof(pg_cryptohash_ctx));
+#endif
+
+	if (!ctx)
+		goto error;
+
+	switch(type)
+	{
+		case PG_MD5:
+			ctx->hash_type = SEC_OID_MD5;
+			break;
+		case PG_SHA224:
+			ctx->hash_type = SEC_OID_SHA224;
+			break;
+		case PG_SHA256:
+			ctx->hash_type = SEC_OID_SHA256;
+			break;
+		case PG_SHA384:
+			ctx->hash_type = SEC_OID_SHA384;
+			break;
+		case PG_SHA512:
+			ctx->hash_type = SEC_OID_SHA512;
+			break;
+	}
+
+	/*
+	 * Initialize our own NSS context without a database backing it.
+	 */
+	memset(&params, 0, sizeof(params));
+	params.length = sizeof(params);
+	ctx->nss_context = NSS_InitContext("", "", "", "", &params,
+									   NSS_INIT_READONLY | NSS_INIT_NOCERTDB |
+									   NSS_INIT_NOMODDB | NSS_INIT_FORCEOPEN |
+									   NSS_INIT_NOROOTINIT | NSS_INIT_PK11RELOAD);
+	if (!ctx->nss_context)
+	{
+		explicit_bzero(ctx, sizeof(pg_cryptohash_ctx));
+		pfree(ctx);
+		goto error;
+	}
+	ctx->type = type;
+	hash = SECOID_FindOIDByTag(ctx->hash_type);
+	ctx->pk11_context = PK11_CreateDigestContext(hash->offset);
+	if (!ctx->pk11_context)
+	{
+		explicit_bzero(ctx, sizeof(pg_cryptohash_ctx));
+		pfree(ctx);
+		goto error;
+	}
+
+#ifndef FRONTEND
+	ctx->resowner = CurrentResourceOwner;
+	ResourceOwnerRememberCryptoHash(CurrentResourceOwner,
+									PointerGetDatum(ctx));
+#endif
+
+	return ctx;
+
+error:
+#ifndef FRONTEND
+	ereport(ERROR,
+			(errcode(ERRCODE_OUT_OF_MEMORY),
+			 errmsg("out of memory")));
+#endif
+	return NULL;
+}
+
+/*
+ * pg_cryptohash_init
+ *			Initialize the passed hash context
+ *
+ * Returns 0 on success, -1 on failure.
+ */
+int
+pg_cryptohash_init(pg_cryptohash_ctx *ctx)
+{
+	SECStatus		status;
+
+	status = PK11_DigestBegin(ctx->pk11_context);
+
+	if (status != SECSuccess)
+		return 1;
+	return 0;
+}
+
+/*
+ * pg_cryptohash_update
+ *
+ * Update a hash context.  Returns 0 on success, -1 on failure.
+ */
+int
+pg_cryptohash_update(pg_cryptohash_ctx *ctx, const uint8 *data, size_t len)
+{
+	SECStatus	status;
+
+	if (ctx == NULL)
+		return -1;
+	
+	status = PK11_DigestOp(ctx->pk11_context, data, len);
+	if (status != SECSuccess)
+		return -1;
+	
+	return 0;
+}
+
+/*
+ * pg_cryptohash_final
+ *
+ * Finalize a hash context.  Returns 0 on success, -1 on failure.
+ */
+int
+pg_cryptohash_final(pg_cryptohash_ctx *ctx, uint8 *dest)
+{
+	SECStatus	status;
+	unsigned int outlen;
+	const SECHashObject *object;
+
+	object = HASH_GetHashObject(ctx->hash_type);
+	status = PK11_DigestFinal(ctx->pk11_context, dest, &outlen, object->length);
+
+	if (status != SECSuccess)
+		return -1;
+	return 0;
+}
+
+/*
+ * pg_cryptohash_free
+ *
+ * Free a hash context and the associated NSS context.
+ */
+void
+pg_cryptohash_free(pg_cryptohash_ctx *ctx)
+{
+	PRBool		free_context = PR_TRUE;
+	if (!ctx)
+		return;
+	
+	PK11_DestroyContext(ctx->pk11_context, free_context);
+#ifndef FRONTEND
+	ResourceOwnerForgetCryptoHash(ctx->resowner, PointerGetDatum(ctx));
+#endif
+	NSS_ShutdownContext(ctx->nss_context);
+	explicit_bzero(ctx, sizeof(pg_cryptohash_ctx));
+	pfree(ctx);
+}
-- 
2.25.1

From b3e18564697bdb36a8eba4afe6434294676b528b Mon Sep 17 00:00:00 2001
From: Michael Paquier <michael@paquier.xyz>
Date: Wed, 27 Jan 2021 16:36:45 +0900
Subject: [PATCH] Introduce --with-ssl={openssl} in configure options

---
 src/include/pg_config.h.in                    |   2 +-
 src/backend/libpq/Makefile                    |   2 +-
 src/backend/libpq/hba.c                       |   2 +-
 src/common/Makefile                           |   2 +-
 src/interfaces/libpq/Makefile                 |   2 +-
 src/test/Makefile                             |   2 +-
 src/test/modules/Makefile                     |   2 +-
 .../modules/ssl_passphrase_callback/Makefile  |   2 +-
 .../ssl_passphrase_callback/t/001_testfunc.pl |   2 +-
 src/test/ssl/Makefile                         |   2 +-
 src/test/ssl/t/001_ssltests.pl                |   2 +-
 src/test/ssl/t/002_scram.pl                   |   2 +-
 doc/src/sgml/installation.sgml                |   5 +-
 doc/src/sgml/pgcrypto.sgml                    |   2 +-
 doc/src/sgml/sslinfo.sgml                     |   2 +-
 contrib/Makefile                              |   2 +-
 contrib/pgcrypto/Makefile                     |   4 +-
 configure                                     | 110 +++++++++++-------
 configure.ac                                  |  31 +++--
 src/Makefile.global.in                        |   2 +-
 src/tools/msvc/Solution.pm                    |   2 +-
 src/tools/msvc/config_default.pl              |   2 +-
 22 files changed, 113 insertions(+), 73 deletions(-)

diff --git a/src/include/pg_config.h.in b/src/include/pg_config.h.in
index f4d9f3b408..55cab4d2bf 100644
--- a/src/include/pg_config.h.in
+++ b/src/include/pg_config.h.in
@@ -899,7 +899,7 @@
 /* Define to select named POSIX semaphores. */
 #undef USE_NAMED_POSIX_SEMAPHORES
 
-/* Define to build with OpenSSL support. (--with-openssl) */
+/* Define to build with OpenSSL support. (--with-ssl=openssl) */
 #undef USE_OPENSSL
 
 /* Define to 1 to build with PAM support. (--with-pam) */
diff --git a/src/backend/libpq/Makefile b/src/backend/libpq/Makefile
index efc5ef760a..8d1d16b0fc 100644
--- a/src/backend/libpq/Makefile
+++ b/src/backend/libpq/Makefile
@@ -28,7 +28,7 @@ OBJS = \
 	pqmq.o \
 	pqsignal.o
 
-ifeq ($(with_openssl),yes)
+ifeq ($(with_ssl),openssl)
 OBJS += be-secure-openssl.o
 endif
 
diff --git a/src/backend/libpq/hba.c b/src/backend/libpq/hba.c
index 371dccb852..20bf1461ce 100644
--- a/src/backend/libpq/hba.c
+++ b/src/backend/libpq/hba.c
@@ -1041,7 +1041,7 @@ parse_hba_line(TokenizedLine *tok_line, int elevel)
 			ereport(elevel,
 					(errcode(ERRCODE_CONFIG_FILE_ERROR),
 					 errmsg("hostssl record cannot match because SSL is not supported by this build"),
-					 errhint("Compile with --with-openssl to use SSL connections."),
+					 errhint("Compile with --with-ssl=openssl to use SSL connections."),
 					 errcontext("line %d of configuration file \"%s\"",
 								line_num, HbaFileName)));
 			*err_msg = "hostssl record cannot match because SSL is not supported by this build";
diff --git a/src/common/Makefile b/src/common/Makefile
index 1a1d0d3406..5422579a6a 100644
--- a/src/common/Makefile
+++ b/src/common/Makefile
@@ -80,7 +80,7 @@ OBJS_COMMON = \
 	wait_error.o \
 	wchar.o
 
-ifeq ($(with_openssl),yes)
+ifeq ($(with_ssl),openssl)
 OBJS_COMMON += \
 	protocol_openssl.o \
 	cryptohash_openssl.o
diff --git a/src/interfaces/libpq/Makefile b/src/interfaces/libpq/Makefile
index c4fde3f93d..2b7ace52e4 100644
--- a/src/interfaces/libpq/Makefile
+++ b/src/interfaces/libpq/Makefile
@@ -45,7 +45,7 @@ OBJS = \
 	pqexpbuffer.o \
 	fe-auth.o
 
-ifeq ($(with_openssl),yes)
+ifeq ($(with_ssl),openssl)
 OBJS += \
 	fe-secure-common.o \
 	fe-secure-openssl.o
diff --git a/src/test/Makefile b/src/test/Makefile
index ab1ef9a475..f7859c2fd5 100644
--- a/src/test/Makefile
+++ b/src/test/Makefile
@@ -28,7 +28,7 @@ ifneq (,$(filter ldap,$(PG_TEST_EXTRA)))
 SUBDIRS += ldap
 endif
 endif
-ifeq ($(with_openssl),yes)
+ifeq ($(with_ssl),openssl)
 ifneq (,$(filter ssl,$(PG_TEST_EXTRA)))
 SUBDIRS += ssl
 endif
diff --git a/src/test/modules/Makefile b/src/test/modules/Makefile
index 59921b46cf..5391f461a2 100644
--- a/src/test/modules/Makefile
+++ b/src/test/modules/Makefile
@@ -28,7 +28,7 @@ SUBDIRS = \
 		  unsafe_tests \
 		  worker_spi
 
-ifeq ($(with_openssl),yes)
+ifeq ($(with_ssl),openssl)
 SUBDIRS += ssl_passphrase_callback
 else
 ALWAYS_SUBDIRS += ssl_passphrase_callback
diff --git a/src/test/modules/ssl_passphrase_callback/Makefile b/src/test/modules/ssl_passphrase_callback/Makefile
index f81265c296..a34d7ea46a 100644
--- a/src/test/modules/ssl_passphrase_callback/Makefile
+++ b/src/test/modules/ssl_passphrase_callback/Makefile
@@ -1,6 +1,6 @@
 # ssl_passphrase_callback Makefile
 
-export with_openssl
+export with_ssl
 
 MODULE_big = ssl_passphrase_func
 OBJS = ssl_passphrase_func.o $(WIN32RES)
diff --git a/src/test/modules/ssl_passphrase_callback/t/001_testfunc.pl b/src/test/modules/ssl_passphrase_callback/t/001_testfunc.pl
index dbc084f870..d9838a5d5a 100644
--- a/src/test/modules/ssl_passphrase_callback/t/001_testfunc.pl
+++ b/src/test/modules/ssl_passphrase_callback/t/001_testfunc.pl
@@ -7,7 +7,7 @@ use TestLib;
 use Test::More;
 use PostgresNode;
 
-unless (($ENV{with_openssl} || 'no') eq 'yes')
+unless ($ENV{with_ssl} eq 'openssl')
 {
 	plan skip_all => 'SSL not supported by this build';
 }
diff --git a/src/test/ssl/Makefile b/src/test/ssl/Makefile
index 93335b1ea2..d545382eea 100644
--- a/src/test/ssl/Makefile
+++ b/src/test/ssl/Makefile
@@ -13,7 +13,7 @@ subdir = src/test/ssl
 top_builddir = ../../..
 include $(top_builddir)/src/Makefile.global
 
-export with_openssl
+export with_ssl
 
 CERTIFICATES := server_ca server-cn-and-alt-names \
 	server-cn-only server-single-alt-name server-multiple-alt-names \
diff --git a/src/test/ssl/t/001_ssltests.pl b/src/test/ssl/t/001_ssltests.pl
index fd2727b568..9cf4ee24cb 100644
--- a/src/test/ssl/t/001_ssltests.pl
+++ b/src/test/ssl/t/001_ssltests.pl
@@ -11,7 +11,7 @@ use lib $FindBin::RealBin;
 
 use SSLServer;
 
-if ($ENV{with_openssl} eq 'yes')
+if ($ENV{with_ssl} eq 'openssl')
 {
 	plan tests => 93;
 }
diff --git a/src/test/ssl/t/002_scram.pl b/src/test/ssl/t/002_scram.pl
index a088f71a1a..2bdd638115 100644
--- a/src/test/ssl/t/002_scram.pl
+++ b/src/test/ssl/t/002_scram.pl
@@ -13,7 +13,7 @@ use lib $FindBin::RealBin;
 
 use SSLServer;
 
-if ($ENV{with_openssl} ne 'yes')
+if ($ENV{with_ssl} ne 'openssl')
 {
 	plan skip_all => 'SSL not supported by this build';
 }
diff --git a/doc/src/sgml/installation.sgml b/doc/src/sgml/installation.sgml
index a53389b728..2d52068310 100644
--- a/doc/src/sgml/installation.sgml
+++ b/doc/src/sgml/installation.sgml
@@ -967,7 +967,7 @@ build-postgresql:
       </varlistentry>
 
       <varlistentry>
-       <term><option>--with-openssl</option>
+       <term><option>--with-ssl=<replaceable>LIBRARY</replaceable></option>
        <indexterm>
         <primary>OpenSSL</primary>
         <seealso>SSL</seealso>
@@ -980,7 +980,8 @@ build-postgresql:
          package to be installed.  <filename>configure</filename> will check
          for the required header files and libraries to make sure that
          your <productname>OpenSSL</productname> installation is sufficient
-         before proceeding.
+         before proceeding. The only <replaceable>LIBRARY</replaceable>
+         supported now is <option>openssl</option>.
         </para>
        </listitem>
       </varlistentry>
diff --git a/doc/src/sgml/pgcrypto.sgml b/doc/src/sgml/pgcrypto.sgml
index 3d74e15ec9..b6bb23de0f 100644
--- a/doc/src/sgml/pgcrypto.sgml
+++ b/doc/src/sgml/pgcrypto.sgml
@@ -1154,7 +1154,7 @@ gen_random_uuid() returns uuid
     <filename>pgcrypto</filename> configures itself according to the findings of the
     main PostgreSQL <literal>configure</literal> script.  The options that
     affect it are <literal>--with-zlib</literal> and
-    <literal>--with-openssl</literal>.
+    <literal>--with-ssl=openssl</literal>.
    </para>
 
    <para>
diff --git a/doc/src/sgml/sslinfo.sgml b/doc/src/sgml/sslinfo.sgml
index 3213c039ca..2a9c45a111 100644
--- a/doc/src/sgml/sslinfo.sgml
+++ b/doc/src/sgml/sslinfo.sgml
@@ -22,7 +22,7 @@
 
  <para>
   This extension won't build at all unless the installation was
-  configured with <literal>--with-openssl</literal>.
+  configured with <literal>--with-ssl=openssl</literal>.
  </para>
 
  <sect2>
diff --git a/contrib/Makefile b/contrib/Makefile
index 7a4866e338..ae1fd64028 100644
--- a/contrib/Makefile
+++ b/contrib/Makefile
@@ -52,7 +52,7 @@ SUBDIRS = \
 		unaccent	\
 		vacuumlo
 
-ifeq ($(with_openssl),yes)
+ifeq ($(with_ssl),openssl)
 SUBDIRS += sslinfo
 else
 ALWAYS_SUBDIRS += sslinfo
diff --git a/contrib/pgcrypto/Makefile b/contrib/pgcrypto/Makefile
index 316a26e58d..c0b4f1fcf6 100644
--- a/contrib/pgcrypto/Makefile
+++ b/contrib/pgcrypto/Makefile
@@ -10,8 +10,8 @@ OSSL_TESTS = sha2 des 3des cast5
 ZLIB_TST = pgp-compression
 ZLIB_OFF_TST = pgp-zlib-DISABLED
 
-CF_SRCS = $(if $(subst no,,$(with_openssl)), $(OSSL_SRCS), $(INT_SRCS))
-CF_TESTS = $(if $(subst no,,$(with_openssl)), $(OSSL_TESTS), $(INT_TESTS))
+CF_SRCS = $(if $(subst openssl,,$(with_ssl)), $(INT_SRCS), $(OSSL_SRCS))
+CF_TESTS = $(if $(subst openssl,,$(with_ssl)), $(INT_TESTS), $(OSSL_TESTS))
 CF_PGP_TESTS = $(if $(subst no,,$(with_zlib)), $(ZLIB_TST), $(ZLIB_OFF_TST))
 
 SRCS = \
diff --git a/configure b/configure
index e202697bbf..092e03e8ed 100755
--- a/configure
+++ b/configure
@@ -653,6 +653,7 @@ LIBOBJS
 UUID_LIBS
 LDAP_LIBS_BE
 LDAP_LIBS_FE
+with_ssl
 PTHREAD_CFLAGS
 PTHREAD_LIBS
 PTHREAD_CC
@@ -709,7 +710,6 @@ with_uuid
 with_readline
 with_systemd
 with_selinux
-with_openssl
 with_ldap
 with_krb_srvnam
 krb_srvtab
@@ -854,7 +854,6 @@ with_pam
 with_bsd_auth
 with_ldap
 with_bonjour
-with_openssl
 with_selinux
 with_systemd
 with_readline
@@ -866,6 +865,8 @@ with_libxslt
 with_system_tzdata
 with_zlib
 with_gnu_ld
+with_ssl
+with_openssl
 enable_largefile
 '
       ac_precious_vars='build_alias
@@ -1556,7 +1557,6 @@ Optional Packages:
   --with-bsd-auth         build with BSD Authentication support
   --with-ldap             build with LDAP support
   --with-bonjour          build with Bonjour support
-  --with-openssl          build with OpenSSL support
   --with-selinux          build with SELinux support
   --with-systemd          build with systemd support
   --without-readline      do not use GNU Readline nor BSD Libedit for editing
@@ -1570,6 +1570,8 @@ Optional Packages:
                           use system time zone data in DIR
   --without-zlib          do not use Zlib
   --with-gnu-ld           assume the C compiler uses GNU ld [default=no]
+  --with-ssl=LIB          use LIB for SSL/TLS support (openssl)
+  --with-openssl          obsolete spelling of --with-ssl=openssl
 
 Some influential environment variables:
   CC          C compiler command
@@ -8070,41 +8072,6 @@ fi
 $as_echo "$with_bonjour" >&6; }
 
 
-#
-# OpenSSL
-#
-{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether to build with OpenSSL support" >&5
-$as_echo_n "checking whether to build with OpenSSL support... " >&6; }
-
-
-
-# Check whether --with-openssl was given.
-if test "${with_openssl+set}" = set; then :
-  withval=$with_openssl;
-  case $withval in
-    yes)
-
-$as_echo "#define USE_OPENSSL 1" >>confdefs.h
-
-      ;;
-    no)
-      :
-      ;;
-    *)
-      as_fn_error $? "no argument expected for --with-openssl option" "$LINENO" 5
-      ;;
-  esac
-
-else
-  with_openssl=no
-
-fi
-
-
-{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $with_openssl" >&5
-$as_echo "$with_openssl" >&6; }
-
-
 #
 # SELinux
 #
@@ -12174,7 +12141,64 @@ fi
   fi
 fi
 
+#
+# SSL Library
+#
+# There is currently one supported SSL/TLS libraries: OpenSSL.
+#
+
+
+
+# Check whether --with-ssl was given.
+if test "${with_ssl+set}" = set; then :
+  withval=$with_ssl;
+  case $withval in
+    yes)
+      as_fn_error $? "argument required for --with-ssl option" "$LINENO" 5
+      ;;
+    no)
+      as_fn_error $? "argument required for --with-ssl option" "$LINENO" 5
+      ;;
+    *)
+
+      ;;
+  esac
+
+fi
+
+
+if test x"$with_ssl" = x"" ; then
+  with_ssl=no
+fi
+
+
+
+# Check whether --with-openssl was given.
+if test "${with_openssl+set}" = set; then :
+  withval=$with_openssl;
+  case $withval in
+    yes)
+      :
+      ;;
+    no)
+      :
+      ;;
+    *)
+      as_fn_error $? "no argument expected for --with-openssl option" "$LINENO" 5
+      ;;
+  esac
+
+else
+  with_openssl=no
+
+fi
+
+
 if test "$with_openssl" = yes ; then
+  with_ssl=openssl
+fi
+
+if test "$with_ssl" = openssl ; then
     # Minimum required OpenSSL version is 1.0.1
 
 $as_echo "#define OPENSSL_API_COMPAT 0x10001000L" >>confdefs.h
@@ -12435,8 +12459,14 @@ _ACEOF
 fi
 done
 
+
+$as_echo "#define USE_OPENSSL 1" >>confdefs.h
+
+elif test "$with_ssl" != no ; then
+  as_fn_error $? "--with-ssl must specify openssl" "$LINENO" 5
 fi
 
+
 if test "$with_pam" = yes ; then
   { $as_echo "$as_me:${as_lineno-$LINENO}: checking for pam_start in -lpam" >&5
 $as_echo_n "checking for pam_start in -lpam... " >&6; }
@@ -13322,7 +13352,7 @@ done
 
 fi
 
-if test "$with_openssl" = yes ; then
+if test "$with_ssl" = openssl ; then
   ac_fn_c_check_header_mongrel "$LINENO" "openssl/ssl.h" "ac_cv_header_openssl_ssl_h" "$ac_includes_default"
 if test "x$ac_cv_header_openssl_ssl_h" = xyes; then :
 
@@ -18098,7 +18128,7 @@ fi
 # will be used.
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking which random number source to use" >&5
 $as_echo_n "checking which random number source to use... " >&6; }
-if test x"$with_openssl" = x"yes" ; then
+if test x"$with_ssl" = x"openssl" ; then
   { $as_echo "$as_me:${as_lineno-$LINENO}: result: OpenSSL" >&5
 $as_echo "OpenSSL" >&6; }
 elif test x"$PORTNAME" = x"win32" ; then
diff --git a/configure.ac b/configure.ac
index a5ad072ee4..f7a2db2574 100644
--- a/configure.ac
+++ b/configure.ac
@@ -852,15 +852,6 @@ PGAC_ARG_BOOL(with, bonjour, no,
 AC_MSG_RESULT([$with_bonjour])
 
 
-#
-# OpenSSL
-#
-AC_MSG_CHECKING([whether to build with OpenSSL support])
-PGAC_ARG_BOOL(with, openssl, no, [build with OpenSSL support],
-              [AC_DEFINE([USE_OPENSSL], 1, [Define to build with OpenSSL support. (--with-openssl)])])
-AC_MSG_RESULT([$with_openssl])
-AC_SUBST(with_openssl)
-
 #
 # SELinux
 #
@@ -1205,7 +1196,21 @@ if test "$with_gssapi" = yes ; then
   fi
 fi
 
+#
+# SSL Library
+#
+# There is currently one supported SSL/TLS libraries: OpenSSL.
+#
+PGAC_ARG_REQ(with, ssl, [LIB], [use LIB for SSL/TLS support (openssl)])
+if test x"$with_ssl" = x"" ; then
+  with_ssl=no
+fi
+PGAC_ARG_BOOL(with, openssl, no, [obsolete spelling of --with-ssl=openssl])
 if test "$with_openssl" = yes ; then
+  with_ssl=openssl
+fi
+
+if test "$with_ssl" = openssl ; then
   dnl Order matters!
   # Minimum required OpenSSL version is 1.0.1
   AC_DEFINE(OPENSSL_API_COMPAT, [0x10001000L],
@@ -1229,7 +1234,11 @@ if test "$with_openssl" = yes ; then
   # thread-safety. In 1.1.0, it's no longer required, and CRYPTO_lock()
   # function was removed.
   AC_CHECK_FUNCS([CRYPTO_lock])
+  AC_DEFINE([USE_OPENSSL], 1, [Define to 1 if you have OpenSSL support.])
+elif test "$with_ssl" != no ; then
+  AC_MSG_ERROR([--with-ssl must specify openssl])
 fi
+AC_SUBST(with_ssl)
 
 if test "$with_pam" = yes ; then
   AC_CHECK_LIB(pam,    pam_start, [], [AC_MSG_ERROR([library 'pam' is required for PAM])])
@@ -1402,7 +1411,7 @@ if test "$with_gssapi" = yes ; then
 	[AC_CHECK_HEADERS(gssapi.h, [], [AC_MSG_ERROR([gssapi.h header file is required for GSSAPI])])])
 fi
 
-if test "$with_openssl" = yes ; then
+if test "$with_ssl" = openssl ; then
   AC_CHECK_HEADER(openssl/ssl.h, [], [AC_MSG_ERROR([header file <openssl/ssl.h> is required for OpenSSL])])
   AC_CHECK_HEADER(openssl/err.h, [], [AC_MSG_ERROR([header file <openssl/err.h> is required for OpenSSL])])
 fi
@@ -2159,7 +2168,7 @@ fi
 # first choice, else the native platform sources (Windows API or /dev/urandom)
 # will be used.
 AC_MSG_CHECKING([which random number source to use])
-if test x"$with_openssl" = x"yes" ; then
+if test x"$with_ssl" = x"openssl" ; then
   AC_MSG_RESULT([OpenSSL])
 elif test x"$PORTNAME" = x"win32" ; then
   AC_MSG_RESULT([Windows native])
diff --git a/src/Makefile.global.in b/src/Makefile.global.in
index 9a1688c97c..74b3a6acd2 100644
--- a/src/Makefile.global.in
+++ b/src/Makefile.global.in
@@ -183,7 +183,7 @@ with_icu	= @with_icu@
 with_perl	= @with_perl@
 with_python	= @with_python@
 with_tcl	= @with_tcl@
-with_openssl	= @with_openssl@
+with_ssl	= @with_ssl@
 with_readline	= @with_readline@
 with_selinux	= @with_selinux@
 with_systemd	= @with_systemd@
diff --git a/src/tools/msvc/Solution.pm b/src/tools/msvc/Solution.pm
index 2f28de0355..1c0c92fcd2 100644
--- a/src/tools/msvc/Solution.pm
+++ b/src/tools/msvc/Solution.pm
@@ -1156,7 +1156,7 @@ sub GetFakeConfigure
 	$cfg .= ' --with-ldap'        if ($self->{options}->{ldap});
 	$cfg .= ' --without-zlib' unless ($self->{options}->{zlib});
 	$cfg .= ' --with-extra-version' if ($self->{options}->{extraver});
-	$cfg .= ' --with-openssl'       if ($self->{options}->{openssl});
+	$cfg .= ' --with-ssl=openssl'   if ($self->{options}->{openssl});
 	$cfg .= ' --with-uuid'          if ($self->{options}->{uuid});
 	$cfg .= ' --with-libxml'        if ($self->{options}->{xml});
 	$cfg .= ' --with-libxslt'       if ($self->{options}->{xslt});
diff --git a/src/tools/msvc/config_default.pl b/src/tools/msvc/config_default.pl
index 2ef2cfc4e9..5395e211eb 100644
--- a/src/tools/msvc/config_default.pl
+++ b/src/tools/msvc/config_default.pl
@@ -16,7 +16,7 @@ our $config = {
 	tcl       => undef,    # --with-tcl=<path>
 	perl      => undef,    # --with-perl=<path>
 	python    => undef,    # --with-python=<path>
-	openssl   => undef,    # --with-openssl=<path>
+	openssl   => undef,    # --with-ssl=openssl with <path>
 	uuid      => undef,    # --with-uuid=<path>
 	xml       => undef,    # --with-libxml=<path>
 	xslt      => undef,    # --with-libxslt=<path>
-- 
2.30.0

From 6d9b00b3b6d309d3374cfdb16bda3b95196285b4 Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Thu, 28 Jan 2021 22:44:46 +0100
Subject: [PATCH v23 8/8] NSS Make the cryptohash NSSInitContext static as an
 experiment

We only need a static reference tot the NSS context, and opening one
per cryptohash operation is incredibly wasteful given that it wasn't
how NSS was designed to operate. This commit lacks the infrastructure
for closing the context on backend exit though, hence experimental.
---
 src/common/cryptohash_nss.c | 36 ++++++++++++++++++++++++++----------
 1 file changed, 26 insertions(+), 10 deletions(-)

diff --git a/src/common/cryptohash_nss.c b/src/common/cryptohash_nss.c
index d4fd2e0008..6b7e48a1b4 100644
--- a/src/common/cryptohash_nss.c
+++ b/src/common/cryptohash_nss.c
@@ -71,6 +71,8 @@
 #define FREE(ptr) free(ptr)
 #endif
 
+static NSSInitContext *nss_context = NULL;
+
 /*
  * Internal pg_cryptohash_ctx structure.
  */
@@ -78,7 +80,6 @@ struct pg_cryptohash_ctx
 {
 	pg_cryptohash_type type;
 
-	NSSInitContext *nss_context;
 	PK11Context *pk11_context;
 	HASH_HashType hash_type;
 
@@ -141,16 +142,20 @@ pg_cryptohash_create(pg_cryptohash_type type)
 	 */
 	memset(&params, 0, sizeof(params));
 	params.length = sizeof(params);
-	ctx->nss_context = NSS_InitContext("", "", "", "", &params,
-									   NSS_INIT_READONLY | NSS_INIT_NOCERTDB |
-									   NSS_INIT_NOMODDB | NSS_INIT_FORCEOPEN |
-									   NSS_INIT_NOROOTINIT | NSS_INIT_PK11RELOAD);
-	if (!ctx->nss_context)
+	if (!nss_context)
 	{
-		explicit_bzero(ctx, sizeof(pg_cryptohash_ctx));
-		FREE(ctx);
-		goto error;
+		nss_context = NSS_InitContext("", "", "", "", &params,
+									  NSS_INIT_READONLY | NSS_INIT_NOCERTDB |
+									  NSS_INIT_NOMODDB | NSS_INIT_FORCEOPEN |
+									  NSS_INIT_NOROOTINIT | NSS_INIT_PK11RELOAD);
+		if (!nss_context)
+		{
+			explicit_bzero(ctx, sizeof(pg_cryptohash_ctx));
+			FREE(ctx);
+			goto error;
+		}
 	}
+
 	ctx->type = type;
 	hash = SECOID_FindOIDByTag(ctx->hash_type);
 	ctx->pk11_context = PK11_CreateDigestContext(hash->offset);
@@ -252,7 +257,18 @@ pg_cryptohash_free(pg_cryptohash_ctx *ctx)
 #ifndef FRONTEND
 	ResourceOwnerForgetCryptoHash(ctx->resowner, PointerGetDatum(ctx));
 #endif
-	NSS_ShutdownContext(ctx->nss_context);
 	explicit_bzero(ctx, sizeof(pg_cryptohash_ctx));
 	FREE(ctx);
 }
+
+/*
+ * TODO: We need a way to close the static NSS context when the backend is
+ * terminated.
+ *
+void
+pg_cryptohash_teardown(void)
+{
+	if (nss_context)
+		NSS_ShutdownContext(ctx->nss_context);
+}
+ */
-- 
2.21.1 (Apple Git-122.3)

From 313148be7d99d8ad7c0bf97abd9c6bee37169422 Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Mon, 18 Jan 2021 13:04:49 +0100
Subject: [PATCH v23 7/8] NSS cryptohash support

---
 src/common/cryptohash_nss.c | 258 ++++++++++++++++++++++++++++++++++++
 src/tools/msvc/Mkvcbuild.pm |   4 +
 2 files changed, 262 insertions(+)
 create mode 100644 src/common/cryptohash_nss.c

diff --git a/src/common/cryptohash_nss.c b/src/common/cryptohash_nss.c
new file mode 100644
index 0000000000..d4fd2e0008
--- /dev/null
+++ b/src/common/cryptohash_nss.c
@@ -0,0 +1,258 @@
+/*-------------------------------------------------------------------------
+ *
+ * cryptohash_nss.c
+ *	  Set of wrapper routines on top of NSS to support cryptographic
+ *	  hash functions.
+ *
+ * This should only be used if code is compiled with NSS support.
+ *
+ * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ *		  src/common/cryptohash_nss.c
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#ifndef FRONTEND
+#include "postgres.h"
+#else
+#include "postgres_fe.h"
+#endif
+
+/*
+ * BITS_PER_BYTE is also defined in the NSPR header files, so we need to undef
+ * our version to avoid compiler warnings on redefinition.
+ */
+#define pg_BITS_PER_BYTE BITS_PER_BYTE
+#undef BITS_PER_BYTE
+
+#include <nss/nss.h>
+#include <nss/hasht.h>
+#include <nss/pk11func.h>
+#include <nss/pk11pub.h>
+#include <nss/secitem.h>
+#include <nss/sechash.h>
+#include <nss/secoid.h>
+#include <nss/secerr.h>
+
+/*
+ * Ensure that the colliding definitions match, else throw an error. In case
+ * NSPR has removed the definition for some reason, make sure to put ours
+ * back again.
+ */
+#if defined(BITS_PER_BYTE)
+#if BITS_PER_BYTE != pg_BITS_PER_BYTE
+#error "incompatible byte widths between NSPR and postgres"
+#endif
+#else
+#define BITS_PER_BYTE pg_BITS_PER_BYTE
+#endif
+#undef pg_BITS_PER_BYTE
+
+#include "common/cryptohash.h"
+#ifndef FRONTEND
+#include "utils/memutils.h"
+#include "utils/resowner.h"
+#include "utils/resowner_private.h"
+#endif
+
+/*
+ * In the backend, use an allocation in TopMemoryContext to count for
+ * resowner cleanup handling.  In the frontend, use malloc to be able
+ * to return a failure status back to the caller.
+ */
+#ifndef FRONTEND
+#define ALLOC(size) MemoryContextAlloc(TopMemoryContext, size)
+#define FREE(ptr) pfree(ptr)
+#else
+#define ALLOC(size) malloc(size)
+#define FREE(ptr) free(ptr)
+#endif
+
+/*
+ * Internal pg_cryptohash_ctx structure.
+ */
+struct pg_cryptohash_ctx
+{
+	pg_cryptohash_type type;
+
+	NSSInitContext *nss_context;
+	PK11Context *pk11_context;
+	HASH_HashType hash_type;
+
+#ifndef FRONTEND
+	ResourceOwner resowner;
+#endif
+};
+
+/*
+ * pg_cryptohash_create
+ *
+ * Create and allocate a new hash context. Returns NULL on failure in the
+ * frontend, and raise error without returning in the backend.
+ */
+pg_cryptohash_ctx *
+pg_cryptohash_create(pg_cryptohash_type type)
+{
+	NSSInitParameters params;
+	pg_cryptohash_ctx *ctx;
+	SECOidData *hash;
+
+#ifndef FRONTEND
+	/*
+	 * Make sure that the resource owner has space to remember this reference.
+	 * This can error out with "out of memory", so do this before any other
+	 * allocation to avoid leaking.
+	 */
+	ResourceOwnerEnlargeCryptoHash(CurrentResourceOwner);
+#endif
+
+	ctx = ALLOC(sizeof(pg_cryptohash_ctx));
+
+	if (!ctx)
+		goto error;
+
+	switch(type)
+	{
+		case PG_SHA1:
+			ctx->hash_type = SEC_OID_SHA1;
+			break;
+		case PG_MD5:
+			ctx->hash_type = SEC_OID_MD5;
+			break;
+		case PG_SHA224:
+			ctx->hash_type = SEC_OID_SHA224;
+			break;
+		case PG_SHA256:
+			ctx->hash_type = SEC_OID_SHA256;
+			break;
+		case PG_SHA384:
+			ctx->hash_type = SEC_OID_SHA384;
+			break;
+		case PG_SHA512:
+			ctx->hash_type = SEC_OID_SHA512;
+			break;
+	}
+
+	/*
+	 * Initialize our own NSS context without a database backing it.
+	 */
+	memset(&params, 0, sizeof(params));
+	params.length = sizeof(params);
+	ctx->nss_context = NSS_InitContext("", "", "", "", &params,
+									   NSS_INIT_READONLY | NSS_INIT_NOCERTDB |
+									   NSS_INIT_NOMODDB | NSS_INIT_FORCEOPEN |
+									   NSS_INIT_NOROOTINIT | NSS_INIT_PK11RELOAD);
+	if (!ctx->nss_context)
+	{
+		explicit_bzero(ctx, sizeof(pg_cryptohash_ctx));
+		FREE(ctx);
+		goto error;
+	}
+	ctx->type = type;
+	hash = SECOID_FindOIDByTag(ctx->hash_type);
+	ctx->pk11_context = PK11_CreateDigestContext(hash->offset);
+	if (!ctx->pk11_context)
+	{
+		explicit_bzero(ctx, sizeof(pg_cryptohash_ctx));
+		FREE(ctx);
+		goto error;
+	}
+
+#ifndef FRONTEND
+	ctx->resowner = CurrentResourceOwner;
+	ResourceOwnerRememberCryptoHash(CurrentResourceOwner,
+									PointerGetDatum(ctx));
+#endif
+
+	return ctx;
+
+error:
+#ifndef FRONTEND
+	ereport(ERROR,
+			(errcode(ERRCODE_OUT_OF_MEMORY),
+			 errmsg("out of memory")));
+#endif
+	return NULL;
+}
+
+/*
+ * pg_cryptohash_init
+ *			Initialize the passed hash context
+ *
+ * Returns 0 on success, -1 on failure.
+ */
+int
+pg_cryptohash_init(pg_cryptohash_ctx *ctx)
+{
+	SECStatus		status;
+
+	status = PK11_DigestBegin(ctx->pk11_context);
+
+	if (status != SECSuccess)
+		return -1;
+	return 0;
+}
+
+/*
+ * pg_cryptohash_update
+ *
+ * Update a hash context.  Returns 0 on success, -1 on failure.
+ */
+int
+pg_cryptohash_update(pg_cryptohash_ctx *ctx, const uint8 *data, size_t len)
+{
+	SECStatus	status;
+
+	if (ctx == NULL)
+		return -1;
+
+	status = PK11_DigestOp(ctx->pk11_context, data, len);
+	if (status != SECSuccess)
+		return -1;
+
+	return 0;
+}
+
+/*
+ * pg_cryptohash_final
+ *
+ * Finalize a hash context.  Returns 0 on success, -1 on failure.
+ */
+int
+pg_cryptohash_final(pg_cryptohash_ctx *ctx, uint8 *dest)
+{
+	SECStatus	status;
+	unsigned int outlen;
+	const SECHashObject *object;
+
+	object = HASH_GetHashObject(ctx->hash_type);
+	status = PK11_DigestFinal(ctx->pk11_context, dest, &outlen, object->length);
+
+	if (status != SECSuccess)
+		return -1;
+	return 0;
+}
+
+/*
+ * pg_cryptohash_free
+ *
+ * Free a hash context and the associated NSS context.
+ */
+void
+pg_cryptohash_free(pg_cryptohash_ctx *ctx)
+{
+	PRBool		free_context = PR_TRUE;
+	if (!ctx)
+		return;
+
+	PK11_DestroyContext(ctx->pk11_context, free_context);
+#ifndef FRONTEND
+	ResourceOwnerForgetCryptoHash(ctx->resowner, PointerGetDatum(ctx));
+#endif
+	NSS_ShutdownContext(ctx->nss_context);
+	explicit_bzero(ctx, sizeof(pg_cryptohash_ctx));
+	FREE(ctx);
+}
diff --git a/src/tools/msvc/Mkvcbuild.pm b/src/tools/msvc/Mkvcbuild.pm
index 660387d0e8..180eb0aa3f 100644
--- a/src/tools/msvc/Mkvcbuild.pm
+++ b/src/tools/msvc/Mkvcbuild.pm
@@ -132,6 +132,10 @@ sub mkvcbuild
 		push(@pgcommonallfiles, 'cryptohash_openssl.c');
 		push(@pgcommonallfiles, 'protocol_openssl.c');
 	}
+	elsif ($solution->{options}->{nss})
+	{
+		push(@pgcommonallfiles, 'cryptohash_nss.c');
+	}
 	else
 	{
 		push(@pgcommonallfiles, 'cryptohash.c');
-- 
2.21.1 (Apple Git-122.3)

From 0d0a2152f1ff936af9ae9040388edc3484b6b757 Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Wed, 28 Oct 2020 11:34:37 +0100
Subject: [PATCH v23 6/8] NSS contrib modules

---
 contrib/pgcrypto/Makefile   |   7 +-
 contrib/pgcrypto/nss.c      | 773 ++++++++++++++++++++++++++++++++++++
 contrib/sslinfo/sslinfo.c   |  32 ++
 doc/src/sgml/pgcrypto.sgml  |  38 +-
 doc/src/sgml/sslinfo.sgml   |  12 +-
 src/tools/msvc/Install.pm   |   3 +-
 src/tools/msvc/Mkvcbuild.pm |  12 +-
 7 files changed, 863 insertions(+), 14 deletions(-)
 create mode 100644 contrib/pgcrypto/nss.c

diff --git a/contrib/pgcrypto/Makefile b/contrib/pgcrypto/Makefile
index 3500bd4c72..ede7a78146 100644
--- a/contrib/pgcrypto/Makefile
+++ b/contrib/pgcrypto/Makefile
@@ -7,11 +7,14 @@ INT_TESTS = sha2
 OSSL_SRCS = openssl.c pgp-mpi-openssl.c
 OSSL_TESTS = sha2 des 3des cast5
 
+NSS_SRCS = nss.c pgp-mpi-internal.c imath.c blf.c
+NSS_TESTS = sha2 des 3des
+
 ZLIB_TST = pgp-compression
 ZLIB_OFF_TST = pgp-zlib-DISABLED
 
-CF_SRCS = $(if $(subst openssl,,$(with_ssl)), $(OSSL_SRCS), $(INT_SRCS))
-CF_TESTS = $(if $(subst openssl,,$(with_ssl)), $(OSSL_TESTS), $(INT_TESTS))
+CF_SRCS = $(if $(findstring openssl, $(with_ssl)), $(OSSL_SRCS), $(if $(findstring nss, $(with_ssl)), $(NSS_SRCS), $(INT_SRCS)))
+CF_TESTS = $(if $(findstring openssl, $(with_ssl)), $(OSSL_TESTS), $(if $(findstring nss, $(with_ssl)), $(NSS_TESTS), $(INT_TESTS)))
 CF_PGP_TESTS = $(if $(subst no,,$(with_zlib)), $(ZLIB_TST), $(ZLIB_OFF_TST))
 
 SRCS = \
diff --git a/contrib/pgcrypto/nss.c b/contrib/pgcrypto/nss.c
new file mode 100644
index 0000000000..da66152d65
--- /dev/null
+++ b/contrib/pgcrypto/nss.c
@@ -0,0 +1,773 @@
+/*-------------------------------------------------------------------------
+ *
+ * nss.c
+ *	  Wrapper for using NSS as a backend for pgcrypto PX
+ *
+ *
+ * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ *	  contrib/pgcrypto/nss.c
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#include "postgres.h"
+
+#include "px.h"
+#include "blf.h"
+#include "utils/memutils.h"
+
+/*
+ * BITS_PER_BYTE is also defined in the NSPR header files, so we need to undef
+ * our version to avoid compiler warnings on redefinition.
+ */
+#define pg_BITS_PER_BYTE BITS_PER_BYTE
+#undef BITS_PER_BYTE
+
+#include <nss/nss.h>
+#include <nss/hasht.h>
+#include <nss/pk11func.h>
+#include <nss/pk11pub.h>
+#include <nss/secitem.h>
+#include <nss/sechash.h>
+#include <nss/secoid.h>
+#include <nss/secerr.h>
+
+/*
+ * Ensure that the colliding definitions match, else throw an error. In case
+ * NSPR has removed the definition for some reason, make sure to put ours
+ * back again.
+ */
+#if defined(BITS_PER_BYTE)
+#if BITS_PER_BYTE != pg_BITS_PER_BYTE
+#error "incompatible byte widths between NSPR and postgres"
+#endif
+#else
+#define BITS_PER_BYTE pg_BITS_PER_BYTE
+#endif
+#undef pg_BITS_PER_BYTE
+
+/*
+ * Define our own mechanisms for Blowfish as it's not implemented by NSS.
+ */
+#define BLOWFISH_CBC	(1)
+#define BLOWFISH_ECB	(2)
+
+/*
+ * Data structures for recording cipher implementations as well as ongoing
+ * cipher operations.
+ */
+typedef struct nss_digest
+{
+	NSSInitContext *context;
+	PK11Context *hash_context;
+	HASH_HashType hash_type;
+}			nss_digest;
+
+typedef struct cipher_implementation
+{
+	/* Function pointers to cipher operations */
+	int			(*init) (PX_Cipher *pxc, const uint8 *key, unsigned klen, const uint8 *iv);
+	unsigned	(*get_block_size) (PX_Cipher *pxc);
+	unsigned	(*get_key_size) (PX_Cipher *pxc);
+	unsigned	(*get_iv_size) (PX_Cipher *pxc);
+	int			(*encrypt) (PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res);
+	int			(*decrypt) (PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res);
+	void		(*free) (PX_Cipher *pxc);
+
+	/* The mechanism describing the cipher used */
+	union
+	{
+		CK_MECHANISM_TYPE nss;
+		CK_ULONG	internal;
+	}			mechanism;
+	int			keylen;
+	bool		is_nss;
+}			cipher_implementation;
+
+typedef struct nss_cipher
+{
+	const cipher_implementation *impl;
+	NSSInitContext *context;
+	PK11Context *crypt_context;
+	SECItem    *params;
+
+	PK11SymKey *encrypt_key;
+	PK11SymKey *decrypt_key;
+}			nss_cipher;
+
+typedef struct internal_cipher
+{
+	const cipher_implementation *impl;
+	BlowfishContext context;
+}			internal_cipher;
+
+typedef struct nss_cipher_ref
+{
+	const char *name;
+	const cipher_implementation *impl;
+}			nss_cipher_ref;
+
+/*
+ * Prototypes
+ */
+static unsigned nss_get_iv_size(PX_Cipher *pxc);
+static unsigned nss_get_block_size(PX_Cipher *pxc);
+
+/*
+ * nss_GetHashOidTagByHashType
+ *
+ * Returns the corresponding SECOidTag for the passed hash type. NSS 3.43
+ * includes HASH_GetHashOidTagByHashType for this purpose, but at the time of
+ * writing is not commonly available so we need our own version till then.
+ */
+static SECOidTag
+nss_GetHashOidTagByHashType(HASH_HashType type)
+{
+	if (type == HASH_AlgMD2)
+		return SEC_OID_MD2;
+	if (type == HASH_AlgMD5)
+		return SEC_OID_MD5;
+	if (type == HASH_AlgSHA1)
+		return SEC_OID_SHA1;
+	if (type == HASH_AlgSHA224)
+		return SEC_OID_SHA224;
+	if (type == HASH_AlgSHA256)
+		return SEC_OID_SHA256;
+	if (type == HASH_AlgSHA384)
+		return SEC_OID_SHA384;
+	if (type == HASH_AlgSHA512)
+		return SEC_OID_SHA512;
+
+	return SEC_OID_UNKNOWN;
+}
+
+static unsigned
+nss_digest_block_size(PX_MD *pxmd)
+{
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+	const SECHashObject *object;
+
+	object = HASH_GetHashObject(digest->hash_type);
+	return object->blocklength;
+}
+
+static unsigned
+nss_digest_result_size(PX_MD *pxmd)
+{
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+	const SECHashObject *object;
+
+	object = HASH_GetHashObject(digest->hash_type);
+	return object->length;
+}
+
+static void
+nss_digest_free(PX_MD *pxmd)
+{
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+	PRBool		free_ctx = PR_TRUE;
+
+	PK11_DestroyContext(digest->hash_context, free_ctx);
+	NSS_ShutdownContext(digest->context);
+}
+
+static void
+nss_digest_update(PX_MD *pxmd, const uint8 *data, unsigned dlen)
+{
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+
+	PK11_DigestOp(digest->hash_context, data, dlen);
+}
+
+static void
+nss_digest_reset(PX_MD *pxmd)
+{
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+
+	PK11_DigestBegin(digest->hash_context);
+}
+
+static void
+nss_digest_finish(PX_MD *pxmd, uint8 *dst)
+{
+	unsigned int outlen;
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+	const SECHashObject *object;
+
+	object = HASH_GetHashObject(digest->hash_type);
+	PK11_DigestFinal(digest->hash_context, dst, &outlen, object->length);
+}
+
+int
+px_find_digest(const char *name, PX_MD **res)
+{
+	PX_MD	   *pxmd;
+	NSSInitParameters params;
+	NSSInitContext *nss_context;
+	bool		found = false;
+	nss_digest *digest;
+	SECStatus	status;
+	SECOidData *hash;
+	HASH_HashType t;
+
+	/*
+	 * Initialize our own NSS context without a database backing it.
+	 */
+	memset(&params, 0, sizeof(params));
+	params.length = sizeof(params);
+	nss_context = NSS_InitContext("", "", "", "", &params,
+								  NSS_INIT_READONLY | NSS_INIT_NOCERTDB |
+								  NSS_INIT_NOMODDB | NSS_INIT_FORCEOPEN |
+								  NSS_INIT_NOROOTINIT | NSS_INIT_PK11RELOAD);
+
+	/*
+	 * There is no API function for looking up a digest algorithm from a name
+	 * string, but there is a publicly accessible array which can be scanned
+	 * for the name.
+	 */
+	for (t = HASH_AlgNULL + 1; t < HASH_AlgTOTAL; t++)
+	{
+		SECOidTag	hash_oid;
+		char	   *p;
+
+		hash_oid = nss_GetHashOidTagByHashType(t);
+
+		if (hash_oid == SEC_OID_UNKNOWN)
+			return PXE_NO_HASH;
+
+		hash = SECOID_FindOIDByTag(hash_oid);
+		if (pg_strcasecmp(hash->desc, name) == 0)
+		{
+			found = true;
+			break;
+		}
+
+		/*
+		 * NSS saves the algorithm names using SHA-xxx notation whereas
+		 * OpenSSL use SHAxxx. To make sure the user finds the requested
+		 * algorithm let's remove the dash and compare that spelling as well.
+		 */
+		if ((p = strchr(hash->desc, '-')) != NULL)
+		{
+			char		tmp[12];
+
+			memcpy(tmp, hash->desc, p - hash->desc);
+			memcpy(tmp + (p - hash->desc), p + 1, strlen(hash->desc) - (p - hash->desc) + 1);
+			if (pg_strcasecmp(tmp, name) == 0)
+			{
+				found = true;
+				break;
+			}
+		}
+	}
+
+	if (!found)
+		return PXE_NO_HASH;
+
+	digest = palloc(sizeof(*digest));
+
+	digest->context = nss_context;
+	digest->hash_context = PK11_CreateDigestContext(hash->offset);
+	digest->hash_type = t;
+	if (digest->hash_context == NULL)
+	{
+		pfree(digest);
+		return -1;
+	}
+
+	status = PK11_DigestBegin(digest->hash_context);
+	if (status != SECSuccess)
+	{
+		PK11_DestroyContext(digest->hash_context, PR_TRUE);
+		pfree(digest);
+		return -1;
+	}
+
+	pxmd = palloc(sizeof(*pxmd));
+	pxmd->result_size = nss_digest_result_size;
+	pxmd->block_size = nss_digest_block_size;
+	pxmd->reset = nss_digest_reset;
+	pxmd->update = nss_digest_update;
+	pxmd->finish = nss_digest_finish;
+	pxmd->free = nss_digest_free;
+	pxmd->p.ptr = (void *) digest;
+
+	*res = pxmd;
+
+	return 0;
+}
+
+static int
+bf_init(PX_Cipher *pxc, const uint8 *key, unsigned klen, const uint8 *iv)
+{
+	internal_cipher *cipher = (internal_cipher *) pxc->ptr;
+
+	blowfish_setkey(&cipher->context, key, klen);
+	if (iv)
+		blowfish_setiv(&cipher->context, iv);
+
+	return 0;
+}
+
+static int
+bf_encrypt(PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res)
+{
+	internal_cipher *cipher = (internal_cipher *) pxc->ptr;
+	uint8	   *buf;
+
+	if (dlen == 0)
+		return 0;
+
+	if (dlen & 7)
+		return PXE_NOTBLOCKSIZE;
+
+	buf = palloc(dlen);
+	memcpy(buf, data, dlen);
+
+	if (cipher->impl->mechanism.internal == BLOWFISH_ECB)
+		blowfish_encrypt_ecb(buf, dlen, &cipher->context);
+	else
+		blowfish_encrypt_cbc(buf, dlen, &cipher->context);
+
+	memcpy(res, buf, dlen);
+	pfree(buf);
+
+	return 0;
+}
+
+static int
+bf_decrypt(PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res)
+{
+	internal_cipher *cipher = (internal_cipher *) pxc->ptr;
+
+	if (dlen == 0)
+		return 0;
+
+	if (dlen & 7)
+		return PXE_NOTBLOCKSIZE;
+
+	memcpy(res, data, dlen);
+	if (cipher->impl->mechanism.internal == BLOWFISH_ECB)
+		blowfish_decrypt_ecb(res, dlen, &cipher->context);
+	else
+		blowfish_decrypt_cbc(res, dlen, &cipher->context);
+
+	return 0;
+}
+
+static void
+bf_free(PX_Cipher *pxc)
+{
+	internal_cipher *cipher = (internal_cipher *) pxc->ptr;
+
+	pfree(cipher);
+	pfree(pxc);
+}
+
+static int
+nss_symkey_blockcipher_init(PX_Cipher *pxc, const uint8 *key, unsigned klen,
+							const uint8 *iv)
+{
+	nss_cipher *cipher = (nss_cipher *) pxc->ptr;
+	SECItem		iv_item;
+	unsigned char *iv_item_data;
+	SECItem		key_item;
+	int			keylen;
+	PK11SlotInfo *slot;
+
+	if (cipher->impl->mechanism.nss == CKM_AES_CBC ||
+		cipher->impl->mechanism.nss == CKM_AES_ECB)
+	{
+		if (klen <= 128 / 8)
+			keylen = 128 / 8;
+		else if (klen <= 192 / 8)
+			keylen = 192 / 8;
+		else if (klen <= 256 / 8)
+			keylen = 256 / 8;
+		else
+			return PXE_CIPHER_INIT;
+	}
+	else
+		keylen = cipher->impl->keylen;
+
+	key_item.type = siBuffer;
+	key_item.data = (unsigned char *) key;
+	key_item.len = keylen;
+
+	/*
+	 * If hardware acceleration is configured in NSS one can theoretically get
+	 * a better slot by calling PK11_GetBestSlot() with the mechanism passed
+	 * to it. Unless there are complaints, using the simpler API will make
+	 * error handling easier though.
+	 */
+	slot = PK11_GetInternalSlot();
+	if (!slot)
+		return PXE_CIPHER_INIT;
+
+	/*
+	 * The key must be set up for the operation, and since we don't know at
+	 * this point whether we are asked to encrypt or decrypt we need to store
+	 * both versions.
+	 */
+	cipher->decrypt_key = PK11_ImportSymKey(slot, cipher->impl->mechanism.nss,
+											PK11_OriginUnwrap,
+											CKA_DECRYPT, &key_item,
+											NULL);
+	cipher->encrypt_key = PK11_ImportSymKey(slot, cipher->impl->mechanism.nss,
+											PK11_OriginUnwrap,
+											CKA_ENCRYPT, &key_item,
+											NULL);
+	PK11_FreeSlot(slot);
+
+	if (!cipher->decrypt_key || !cipher->encrypt_key)
+		return PXE_CIPHER_INIT;
+
+	if (iv)
+	{
+		iv_item.type = siBuffer;
+		iv_item.data = (unsigned char *) iv;
+		iv_item.len = nss_get_iv_size(pxc);
+	}
+	else
+	{
+		/*
+		 * The documentation states that either passing .data = 0; .len = 0;
+		 * in the iv_item, or NULL as iv_item, to PK11_ParamFromIV should be
+		 * done when IV is missing. That however leads to segfaults in the
+		 * library, the workaround that works in modern  library versions is
+		 * to pass in a keysized zeroed out IV.
+		 */
+		iv_item_data = palloc0(nss_get_iv_size(pxc));
+		iv_item.type = siBuffer;
+		iv_item.data = iv_item_data;
+		iv_item.len = nss_get_iv_size(pxc);
+	}
+
+	cipher->params = PK11_ParamFromIV(cipher->impl->mechanism.nss, &iv_item);
+
+	/* If we had to make a mock IV, free it once made into a param */
+	if (!iv)
+		pfree(iv_item_data);
+
+	if (cipher->params == NULL)
+		return PXE_CIPHER_INIT;
+
+	return 0;
+}
+
+static int
+nss_decrypt(PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res)
+{
+	nss_cipher *cipher = (nss_cipher *) pxc->ptr;
+	SECStatus	status;
+	int			outlen;
+
+	if (!cipher->crypt_context)
+	{
+		cipher->crypt_context =
+			PK11_CreateContextBySymKey(cipher->impl->mechanism.nss, CKA_DECRYPT,
+									   cipher->decrypt_key, cipher->params);
+	}
+
+	status = PK11_CipherOp(cipher->crypt_context, res, &outlen, dlen, data, dlen);
+	if (status != SECSuccess)
+		return PXE_DECRYPT_FAILED;
+
+	return 0;
+}
+
+static int
+nss_encrypt(PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res)
+{
+	nss_cipher *cipher = (nss_cipher *) pxc->ptr;
+	SECStatus	status;
+	int			outlen;
+
+	if (!cipher->crypt_context)
+	{
+		cipher->crypt_context =
+			PK11_CreateContextBySymKey(cipher->impl->mechanism.nss, CKA_ENCRYPT,
+									   cipher->decrypt_key, cipher->params);
+	}
+
+	status = PK11_CipherOp(cipher->crypt_context, res, &outlen, dlen, data, dlen);
+
+	if (status != SECSuccess)
+		return PXE_DECRYPT_FAILED;
+
+	return 0;
+}
+
+static void
+nss_free(PX_Cipher *pxc)
+{
+	nss_cipher *cipher = pxc->ptr;
+	PRBool		free_ctx = PR_TRUE;
+
+	PK11_FreeSymKey(cipher->encrypt_key);
+	PK11_FreeSymKey(cipher->decrypt_key);
+	PK11_DestroyContext(cipher->crypt_context, free_ctx);
+	NSS_ShutdownContext(cipher->context);
+	pfree(cipher);
+
+	pfree(pxc);
+}
+
+static unsigned
+nss_get_block_size(PX_Cipher *pxc)
+{
+	nss_cipher *cipher = pxc->ptr;
+
+	return PK11_GetBlockSize(cipher->impl->mechanism.nss, NULL);
+}
+
+static unsigned
+nss_get_key_size(PX_Cipher *pxc)
+{
+	nss_cipher *cipher = pxc->ptr;
+
+	return cipher->impl->keylen;
+}
+
+static unsigned
+nss_get_iv_size(PX_Cipher *pxc)
+{
+	nss_cipher *cipher = pxc->ptr;
+
+	return PK11_GetIVLength(cipher->impl->mechanism.nss);
+}
+
+static unsigned
+bf_get_block_size(PX_Cipher *pxc)
+{
+	return 8;
+}
+
+static unsigned
+bf_get_key_size(PX_Cipher *pxc)
+{
+	return 448 / 8;
+}
+
+static unsigned
+bf_get_iv_size(PX_Cipher *pxc)
+{
+	return 8;
+}
+
+/*
+ * Cipher Implementations
+ */
+static const cipher_implementation nss_des_cbc = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_DES_CBC,
+	.keylen = 8,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_des_ecb = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_DES_ECB,
+	.keylen = 8,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_des3_cbc = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_DES3_CBC,
+	.keylen = 24,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_des3_ecb = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_DES3_ECB,
+	.keylen = 24,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_aes_cbc = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_AES_CBC,
+	.keylen = 32,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_aes_ecb = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_AES_ECB,
+	.keylen = 32,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_bf_ecb = {
+	.init = bf_init,
+	.get_block_size = bf_get_block_size,
+	.get_key_size = bf_get_key_size,
+	.get_iv_size = bf_get_iv_size,
+	.encrypt = bf_encrypt,
+	.decrypt = bf_decrypt,
+	.free = bf_free,
+	.mechanism.internal = BLOWFISH_ECB,
+	.keylen = 56,
+	.is_nss = false
+};
+
+static const cipher_implementation nss_bf_cbc = {
+	.init = bf_init,
+	.get_block_size = bf_get_block_size,
+	.get_key_size = bf_get_key_size,
+	.get_iv_size = bf_get_iv_size,
+	.encrypt = bf_encrypt,
+	.decrypt = bf_decrypt,
+	.free = bf_free,
+	.mechanism.internal = BLOWFISH_CBC,
+	.keylen = 56,
+	.is_nss = false
+};
+
+/*
+ * Lookup table for finding the implementation based on a name. CAST5 as well
+ * as BLOWFISH are defined as cipher mechanisms in NSS but error out with
+ * SEC_ERROR_INVALID_ALGORITHM. Blowfish is implemented using the internal
+ * implementation while CAST5 isn't supported at all at this time,
+ */
+static const nss_cipher_ref nss_cipher_lookup[] = {
+	{"des", &nss_des_cbc},
+	{"des-cbc", &nss_des_cbc},
+	{"des-ecb", &nss_des_ecb},
+	{"des3-cbc", &nss_des3_cbc},
+	{"3des", &nss_des3_cbc},
+	{"3des-cbc", &nss_des3_cbc},
+	{"des3-ecb", &nss_des3_ecb},
+	{"3des-ecb", &nss_des3_ecb},
+	{"aes", &nss_aes_cbc},
+	{"aes-cbc", &nss_aes_cbc},
+	{"aes-ecb", &nss_aes_ecb},
+	{"rijndael", &nss_aes_cbc},
+	{"rijndael-cbc", &nss_aes_cbc},
+	{"rijndael-ecb", &nss_aes_ecb},
+	{"blowfish", &nss_bf_cbc},
+	{"blowfish-cbc", &nss_bf_cbc},
+	{"blowfish-ecb", &nss_bf_ecb},
+	{"bf", &nss_bf_cbc},
+	{"bf-cbc", &nss_bf_cbc},
+	{"bf-ecb", &nss_bf_ecb},
+	{NULL}
+};
+
+/*
+ * px_find_cipher
+ *
+ * Search for the requested cipher and see if there is support for it, and if
+ * so return an allocated object containing the playbook for how to encrypt
+ * and decrypt using the cipher.
+ */
+int
+px_find_cipher(const char *alias, PX_Cipher **res)
+{
+	const nss_cipher_ref *cipher_ref;
+	PX_Cipher  *px_cipher;
+	NSSInitParameters params;
+	NSSInitContext *nss_context;
+	nss_cipher *cipher;
+	internal_cipher *int_cipher;
+
+	for (cipher_ref = nss_cipher_lookup; cipher_ref->name; cipher_ref++)
+	{
+		if (strcmp(cipher_ref->name, alias) == 0)
+			break;
+	}
+
+	if (!cipher_ref->name)
+		return PXE_NO_CIPHER;
+
+	/*
+	 * Fill in the PX_Cipher to pass back to PX describing the operations to
+	 * perform in order to use the cipher.
+	 */
+	px_cipher = palloc(sizeof(*px_cipher));
+	px_cipher->block_size = cipher_ref->impl->get_block_size;
+	px_cipher->key_size = cipher_ref->impl->get_key_size;
+	px_cipher->iv_size = cipher_ref->impl->get_iv_size;
+	px_cipher->free = cipher_ref->impl->free;
+	px_cipher->init = cipher_ref->impl->init;
+	px_cipher->encrypt = cipher_ref->impl->encrypt;
+	px_cipher->decrypt = cipher_ref->impl->decrypt;
+
+	/*
+	 * Set the private data, which is different for NSS and internal ciphers
+	 */
+	if (cipher_ref->impl->is_nss)
+	{
+		/*
+		 * Initialize our own NSS context without a database backing it. At
+		 * some point we might want to allow users to use stored keys in the
+		 * database rather than passing them via SELECT encrypt(), and then
+		 * this need to be changed to open a user specified database.
+		 */
+		memset(&params, 0, sizeof(params));
+		params.length = sizeof(params);
+		nss_context = NSS_InitContext("", "", "", "", &params,
+									  NSS_INIT_READONLY | NSS_INIT_NOCERTDB |
+									  NSS_INIT_NOMODDB | NSS_INIT_FORCEOPEN |
+									  NSS_INIT_NOROOTINIT | NSS_INIT_PK11RELOAD);
+
+		/* nss_cipher is the private state struct for the operation */
+		cipher = palloc(sizeof(*cipher));
+		cipher->context = nss_context;
+		cipher->impl = cipher_ref->impl;
+		cipher->crypt_context = NULL;
+
+		px_cipher->ptr = cipher;
+	}
+	else
+	{
+		int_cipher = palloc0(sizeof(*int_cipher));
+
+		int_cipher->impl = cipher_ref->impl;
+		px_cipher->ptr = int_cipher;
+	}
+
+	*res = px_cipher;
+	return 0;
+}
diff --git a/contrib/sslinfo/sslinfo.c b/contrib/sslinfo/sslinfo.c
index 30cae0bb98..3aadd90aa6 100644
--- a/contrib/sslinfo/sslinfo.c
+++ b/contrib/sslinfo/sslinfo.c
@@ -9,9 +9,11 @@
 
 #include "postgres.h"
 
+#ifdef USE_OPENSSL
 #include <openssl/x509.h>
 #include <openssl/x509v3.h>
 #include <openssl/asn1.h>
+#endif
 
 #include "access/htup_details.h"
 #include "funcapi.h"
@@ -21,6 +23,7 @@
 
 PG_MODULE_MAGIC;
 
+#ifdef USE_OPENSSL
 static Datum X509_NAME_field_to_text(X509_NAME *name, text *fieldName);
 static Datum ASN1_STRING_to_text(ASN1_STRING *str);
 
@@ -31,6 +34,7 @@ typedef struct
 {
 	TupleDesc	tupdesc;
 } SSLExtensionInfoContext;
+#endif
 
 /*
  * Indicates whether current session uses SSL
@@ -131,6 +135,7 @@ ssl_client_serial(PG_FUNCTION_ARGS)
 }
 
 
+#ifdef USE_OPENSSL
 /*
  * Converts OpenSSL ASN1_STRING structure into text
  *
@@ -282,7 +287,23 @@ ssl_issuer_field(PG_FUNCTION_ARGS)
 	else
 		return result;
 }
+#endif							/* USE_OPENSSL */
 
+#ifdef USE_NSS
+PG_FUNCTION_INFO_V1(ssl_client_dn_field);
+Datum
+ssl_client_dn_field(PG_FUNCTION_ARGS)
+{
+	PG_RETURN_NULL();
+}
+
+PG_FUNCTION_INFO_V1(ssl_issuer_field);
+Datum
+ssl_issuer_field(PG_FUNCTION_ARGS)
+{
+	PG_RETURN_NULL();
+}
+#endif							/* USE_NSS */
 
 /*
  * Returns current client certificate subject as one string
@@ -338,6 +359,7 @@ ssl_issuer_dn(PG_FUNCTION_ARGS)
 }
 
 
+#ifdef USE_OPENSSL
 /*
  * Returns information about available SSL extensions.
  *
@@ -471,3 +493,13 @@ ssl_extension_info(PG_FUNCTION_ARGS)
 	/* All done */
 	SRF_RETURN_DONE(funcctx);
 }
+#endif							/* USE_OPENSSL */
+
+#ifdef USE_NSS
+PG_FUNCTION_INFO_V1(ssl_extension_info);
+Datum
+ssl_extension_info(PG_FUNCTION_ARGS)
+{
+	PG_RETURN_NULL();
+}
+#endif							/* USE_NSS */
diff --git a/doc/src/sgml/pgcrypto.sgml b/doc/src/sgml/pgcrypto.sgml
index 3d74e15ec9..bf486f0c07 100644
--- a/doc/src/sgml/pgcrypto.sgml
+++ b/doc/src/sgml/pgcrypto.sgml
@@ -45,8 +45,9 @@ digest(data bytea, type text) returns bytea
     <literal>sha224</literal>, <literal>sha256</literal>,
     <literal>sha384</literal> and <literal>sha512</literal>.
     If <filename>pgcrypto</filename> was built with
-    <productname>OpenSSL</productname>, more algorithms are available, as
-    detailed in <xref linkend="pgcrypto-with-without-openssl"/>.
+    <productname>OpenSSL</productname> or <productname>NSS</productname>,
+    more algorithms are available, as
+    detailed in <xref linkend="pgcrypto-with-without-openssl-nss"/>.
    </para>
 
    <para>
@@ -764,7 +765,7 @@ pgp_sym_encrypt(data, psw, 'compress-algo=1, cipher-algo=aes256')
     Which cipher algorithm to use.
    </para>
 <literallayout>
-Values: bf, aes128, aes192, aes256 (OpenSSL-only: <literal>3des</literal>, <literal>cast5</literal>)
+Values: bf, aes128, aes192, aes256 (OpenSSL-only: <literal>3des</literal>, <literal>cast5</literal>; NSS-only: <literal>3des</literal>)
 Default: aes128
 Applies to: pgp_sym_encrypt, pgp_pub_encrypt
 </literallayout>
@@ -1153,8 +1154,8 @@ gen_random_uuid() returns uuid
    <para>
     <filename>pgcrypto</filename> configures itself according to the findings of the
     main PostgreSQL <literal>configure</literal> script.  The options that
-    affect it are <literal>--with-zlib</literal> and
-    <literal>--with-openssl</literal>.
+    affect it are <literal>--with-zlib</literal>,
+    <literal>--with-ssl=openssl</literal> and <literal>--with-ssl=nss</literal>.
    </para>
 
    <para>
@@ -1169,14 +1170,16 @@ gen_random_uuid() returns uuid
     BIGNUM functions.
    </para>
 
-   <table id="pgcrypto-with-without-openssl">
-    <title>Summary of Functionality with and without OpenSSL</title>
-    <tgroup cols="3">
+   <table id="pgcrypto-with-without-openssl-nss">
+    <title>Summary of Functionality with and without external cryptographic
+      library</title>
+    <tgroup cols="4">
      <thead>
       <row>
        <entry>Functionality</entry>
        <entry>Built-in</entry>
        <entry>With OpenSSL</entry>
+       <entry>With NSS</entry>
       </row>
      </thead>
      <tbody>
@@ -1184,51 +1187,67 @@ gen_random_uuid() returns uuid
        <entry>MD5</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>SHA1</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>SHA224/256/384/512</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>Other digest algorithms</entry>
        <entry>no</entry>
        <entry>yes (Note 1)</entry>
+       <entry>yes (Note 1)</entry>
       </row>
       <row>
        <entry>Blowfish</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>AES</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>DES/3DES/CAST5</entry>
        <entry>no</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
+      </row>
+      <row>
+       <entry>CAST5</entry>
+       <entry>no</entry>
+       <entry>yes</entry>
+       <entry>no</entry>
       </row>
       <row>
        <entry>Raw encryption</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>PGP Symmetric encryption</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>PGP Public-Key encryption</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
      </tbody>
     </tgroup>
@@ -1241,7 +1260,8 @@ gen_random_uuid() returns uuid
    <orderedlist>
     <listitem>
      <para>
-      Any digest algorithm <productname>OpenSSL</productname> supports
+      Any digest algorithm <productname>OpenSSL</productname> and
+      <productname>NSS</productname> supports
       is automatically picked up.
       This is not possible with ciphers, which need to be supported
       explicitly.
diff --git a/doc/src/sgml/sslinfo.sgml b/doc/src/sgml/sslinfo.sgml
index 3213c039ca..f3ae2fc3b8 100644
--- a/doc/src/sgml/sslinfo.sgml
+++ b/doc/src/sgml/sslinfo.sgml
@@ -22,7 +22,8 @@
 
  <para>
   This extension won't build at all unless the installation was
-  configured with <literal>--with-openssl</literal>.
+  configured with SSL support, such as <literal>--with-ssl=openssl</literal>
+  or <literal>--with-ssl=nss</literal>.
  </para>
 
  <sect2>
@@ -208,6 +209,9 @@ emailAddress
      the X.500 and X.509 standards, so you cannot just assign arbitrary
      meaning to them.
     </para>
+    <para>
+     This function is only available when using <productname>OpenSSL</productname>.
+    </para>
     </listitem>
    </varlistentry>
 
@@ -223,6 +227,9 @@ emailAddress
      Same as <function>ssl_client_dn_field</function>, but for the certificate issuer
      rather than the certificate subject.
     </para>
+    <para>
+     This function is only available when using <productname>OpenSSL</productname>.
+    </para>
     </listitem>
    </varlistentry>
 
@@ -238,6 +245,9 @@ emailAddress
      Provide information about extensions of client certificate: extension name,
      extension value, and if it is a critical extension.
     </para>
+    <para>
+     This function is only available when using <productname>OpenSSL</productname>.
+    </para>
     </listitem>
    </varlistentry>
   </variablelist>
diff --git a/src/tools/msvc/Install.pm b/src/tools/msvc/Install.pm
index ea3af48777..afe72a7e97 100644
--- a/src/tools/msvc/Install.pm
+++ b/src/tools/msvc/Install.pm
@@ -438,7 +438,8 @@ sub CopyContribFiles
 		{
 			# These configuration-based exclusions must match vcregress.pl
 			next if ($d eq "uuid-ossp"  && !defined($config->{uuid}));
-			next if ($d eq "sslinfo"    && !defined($config->{openssl}));
+			next if ($d eq "sslinfo"    && !defined($config->{openssl})
+			  && !defined($config->{nss}));
 			next if ($d eq "xml2"       && !defined($config->{xml}));
 			next if ($d =~ /_plperl$/   && !defined($config->{perl}));
 			next if ($d =~ /_plpython$/ && !defined($config->{python}));
diff --git a/src/tools/msvc/Mkvcbuild.pm b/src/tools/msvc/Mkvcbuild.pm
index ff01acf3f6..660387d0e8 100644
--- a/src/tools/msvc/Mkvcbuild.pm
+++ b/src/tools/msvc/Mkvcbuild.pm
@@ -445,9 +445,14 @@ sub mkvcbuild
 		push @contrib_excludes, 'xml2';
 	}
 
+	if (!$solution->{options}->{openssl} && !$solution->{options}->{nss})
+	{
+		push @contrib_excludes, 'sslinfo';
+	}
+
 	if (!$solution->{options}->{openssl})
 	{
-		push @contrib_excludes, 'sslinfo', 'ssl_passphrase_callback';
+		push @contrib_excludes, 'ssl_passphrase_callback';
 	}
 
 	if (!$solution->{options}->{uuid})
@@ -477,6 +482,11 @@ sub mkvcbuild
 		$pgcrypto->AddFiles('contrib/pgcrypto', 'openssl.c',
 			'pgp-mpi-openssl.c');
 	}
+	elsif ($solution->{options}->{nss})
+	{
+		$pgcrypto->AddFiles('contrib/pgcrypto', 'nss.c',
+			'pgp-mpi-internal.c', 'imath.c', 'blf.c');
+	}
 	else
 	{
 		$pgcrypto->AddFiles(
-- 
2.21.1 (Apple Git-122.3)

From c78e286bcab3bed4a5f5739981c1b0c4d69d44c3 Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Wed, 28 Oct 2020 11:26:31 +0100
Subject: [PATCH v23 5/8] NSS Documentation

---
 doc/src/sgml/acronyms.sgml     |  43 ++++++++++++
 doc/src/sgml/config.sgml       |  28 +++++++-
 doc/src/sgml/installation.sgml |  44 ++++++++++--
 doc/src/sgml/libpq.sgml        |  99 +++++++++++++++++++++++++-
 doc/src/sgml/runtime.sgml      | 123 +++++++++++++++++++++++++++++++--
 5 files changed, 319 insertions(+), 18 deletions(-)

diff --git a/doc/src/sgml/acronyms.sgml b/doc/src/sgml/acronyms.sgml
index 4e5ec983c0..7b02c8a622 100644
--- a/doc/src/sgml/acronyms.sgml
+++ b/doc/src/sgml/acronyms.sgml
@@ -441,6 +441,28 @@
     </listitem>
    </varlistentry>
 
+   <varlistentry>
+    <term><acronym>NSPR</acronym></term>
+    <listitem>
+     <para>
+      <ulink
+      url="https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSPR">
+      Netscape Portable Runtime</ulink>
+     </para>
+    </listitem>
+   </varlistentry>
+
+   <varlistentry>
+    <term><acronym>NSS</acronym></term>
+    <listitem>
+     <para>
+      <ulink
+      url="https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS">
+      Network Security Services</ulink>
+     </para>
+    </listitem>
+   </varlistentry>
+
    <varlistentry>
     <term><acronym>ODBC</acronym></term>
     <listitem>
@@ -539,6 +561,17 @@
     </listitem>
    </varlistentry>
 
+   <varlistentry>
+    <term><acronym>PKCS#12</acronym></term>
+    <listitem>
+     <para>
+      <ulink
+      url="https://en.wikipedia.org/wiki/PKCS_12">
+      Public-Key Cryptography Standards #12</ulink>
+     </para>
+    </listitem>
+   </varlistentry>
+
    <varlistentry>
     <term><acronym>PL</acronym></term>
     <listitem>
@@ -684,6 +717,16 @@
     </listitem>
    </varlistentry>
 
+   <varlistentry>
+    <term><acronym>TLS</acronym></term>
+    <listitem>
+     <para>
+      <ulink url="https://en.wikipedia.org/wiki/Transport_Layer_Security">
+      Transport Layer Security</ulink>
+     </para>
+    </listitem>
+   </varlistentry>
+
    <varlistentry>
     <term><acronym>TOAST</acronym></term>
     <listitem>
diff --git a/doc/src/sgml/config.sgml b/doc/src/sgml/config.sgml
index f1037df5a9..00ad1553ae 100644
--- a/doc/src/sgml/config.sgml
+++ b/doc/src/sgml/config.sgml
@@ -1236,6 +1236,23 @@ include_dir 'conf.d'
       </listitem>
      </varlistentry>
 
+     <varlistentry id="guc-ssl-database" xreflabel="ssl_database">
+      <term><varname>ssl_database</varname> (<type>string</type>)
+      <indexterm>
+       <primary><varname>ssl_database</varname> configuration parameter</primary>
+      </indexterm>
+      </term>
+      <listitem>
+       <para>
+        Specifies the name of the file containing the server certificates and
+        keys when using <productname>NSS</productname> for <acronym>SSL</acronym>
+        connections. This parameter can only be set in the
+        <filename>postgresql.conf</filename> file or on the server command
+        line.
+       </para>
+      </listitem>
+     </varlistentry>
+
      <varlistentry id="guc-ssl-ciphers" xreflabel="ssl_ciphers">
       <term><varname>ssl_ciphers</varname> (<type>string</type>)
       <indexterm>
@@ -1252,7 +1269,9 @@ include_dir 'conf.d'
         connections using TLS version 1.2 and lower are affected.  There is
         currently no setting that controls the cipher choices used by TLS
         version 1.3 connections.  The default value is
-        <literal>HIGH:MEDIUM:+3DES:!aNULL</literal>.  The default is usually a
+        <literal>HIGH:MEDIUM:+3DES:!aNULL</literal> for servers which have
+        been built with <productname>OpenSSL</productname> as the
+        <acronym>SSL</acronym> library.  The default is usually a
         reasonable choice unless you have specific security requirements.
        </para>
 
@@ -1454,8 +1473,11 @@ include_dir 'conf.d'
        <para>
         Sets an external command to be invoked when a passphrase for
         decrypting an SSL file such as a private key needs to be obtained.  By
-        default, this parameter is empty, which means the built-in prompting
-        mechanism is used.
+        default, this parameter is empty. When the server is using
+        <productname>OpenSSL</productname>, this means the built-in prompting
+        mechanism is used. When using <productname>NSS</productname>, there is
+        no default prompting so a blank callback will be used returning an
+        empty password.
        </para>
        <para>
         The command must print the passphrase to the standard output and exit
diff --git a/doc/src/sgml/installation.sgml b/doc/src/sgml/installation.sgml
index a53389b728..bcfe6ad10c 100644
--- a/doc/src/sgml/installation.sgml
+++ b/doc/src/sgml/installation.sgml
@@ -250,7 +250,7 @@ su - postgres
 
     <listitem>
      <para>
-      You need <productname>OpenSSL</productname>, if you want to support
+      You need a supported <acronym>SSL</acronym> library, if you want to support
       encrypted client connections.  <productname>OpenSSL</productname> is
       also required for random number generation on platforms that do not
       have <filename>/dev/urandom</filename> (except Windows).  The minimum
@@ -966,6 +966,41 @@ build-postgresql:
        </listitem>
       </varlistentry>
 
+      <varlistentry>
+       <term><option>--with-ssl=<replaceable>LIBRARY</replaceable></option>
+       <indexterm>
+        <primary>SSL</primary>
+       </indexterm>
+       </term>
+       <listitem>
+        <para>
+         Build with support for <acronym>SSL</acronym> (encrypted)
+         connections. <replaceable>LIBRARY</replaceable> must be one of:
+        </para>
+        <itemizedlist>
+         <listitem>
+          <para>
+           <option>openssl</option> to build with <productname>OpenSSL</productname> support.
+            This requires the <productname>OpenSSL</productname>
+            package to be installed.  <filename>configure</filename> will check
+            for the required header files and libraries to make sure that
+            your <productname>OpenSSL</productname> installation is sufficient
+            before proceeding.
+          </para>
+         </listitem>
+         <listitem>
+          <para>
+           <option>nss</option> to build with <productname>libnss</productname> support.
+            This requires the <productname>NSS</productname> package to be installed. Additionally,
+            <productname>NSS</productname> requires <productname>NSPR</productname>
+            to be installed. <filename>configure</filename> will check for the
+            required header files and libraries to make sure that your
+            <productname>NSS</productname> installation is sufficient before
+            proceeding.
+          </para>
+         </listitem>
+      </varlistentry>
+
       <varlistentry>
        <term><option>--with-openssl</option>
        <indexterm>
@@ -975,12 +1010,7 @@ build-postgresql:
        </term>
        <listitem>
         <para>
-         Build with support for <acronym>SSL</acronym> (encrypted)
-         connections. This requires the <productname>OpenSSL</productname>
-         package to be installed.  <filename>configure</filename> will check
-         for the required header files and libraries to make sure that
-         your <productname>OpenSSL</productname> installation is sufficient
-         before proceeding.
+         Obsolete equivalent of <literal>--with-ssl=openssl</literal>.
         </para>
        </listitem>
       </varlistentry>
diff --git a/doc/src/sgml/libpq.sgml b/doc/src/sgml/libpq.sgml
index b7a82453f0..89796de168 100644
--- a/doc/src/sgml/libpq.sgml
+++ b/doc/src/sgml/libpq.sgml
@@ -830,6 +830,12 @@ int callback_fn(char *buf, int size, PGconn *conn);
        <function>longjmp(...)</function>, etc. It must return normally.
       </para>
 
+      <para>
+        <function>PQsetSSLKeyPassHook_OpenSSL</function> is only available
+        when the server was compiled with <productname>OpenSSL</productname>
+        support.
+      </para>
+
      </listitem>
     </varlistentry>
 
@@ -846,6 +852,72 @@ PQsslKeyPassHook_OpenSSL_type PQgetSSLKeyPassHook_OpenSSL(void);
 </synopsis>
       </para>
 
+      <para>
+        <function>PQgetSSLKeyPassHook_OpenSSL</function> is only available
+        when the server was compiled with <productname>OpenSSL</productname>
+        support.
+      </para>
+
+     </listitem>
+    </varlistentry>
+
+    <varlistentry id="libpq-pqsetsslkeypasshook-nss">
+     <term><function>PQsetSSLKeyPassHook_nss</function><indexterm><primary>PQsetSSLKeyPassHook_nss</primary></indexterm></term>
+     <listitem>
+      <para>
+       <function>PQsetSSLKeyPassHook_nss</function> lets an application override
+       <application>libpq</application>'s default handling of password protected
+       objects in the <application>NSS</application> database using
+       <xref linkend="libpq-connect-sslpassword"/> or interactive prompting.
+
+<synopsis>
+void PQsetSSLKeyPassHook_nss(PQsslKeyPassHook_nss_type hook);
+</synopsis>
+
+       The application passes a pointer to a callback function with signature:
+<programlisting>
+char *callback_fn(PK11SlotInfo *slot, PRBool retry, void *arg);
+</programlisting>
+       which <application>libpq</application> will call
+       <emphasis>instead of</emphasis> its default
+       <function>PQdefaultSSLKeyPassHook_nss</function> password handler. The
+       callback should determine the password for the token and return a
+       pointer to it. The returned pointer should be allocated with the NSS
+       <function>PORT_Strdup</function> function. The token for which the
+       password is requested is recorded in the slot anc can be identified by
+       calling <function>PK11_GetTokenName</function>. If no password is
+       known, the callback should return <literal>NULL</literal>. The memory
+       will be owned by <productname>NSS</productname> and should not be
+       freed.
+      </para>
+
+      <para>
+        <function>PQsetSSLKeyPassHook_nss</function> is only available
+        when the server was compiled with <productname>NSS</productname>
+        support.
+      </para>
+     </listitem>
+    </varlistentry>
+
+    <varlistentry id="libpq-pqgetsslkeypasshook-nss">
+     <term><function>PQgetSSLKeyPassHook_nss</function><indexterm><primary>PQgetSSLKeyPassHook_nss</primary></indexterm></term>
+     <listitem>
+      <para>
+       <function>PQgetSSLKeyPassHook_nss</function> returns the current
+       <productname>NSS</productname> password hook, or <literal>NULL</literal>
+       if none has been set.
+
+<synopsis>
+PQsslKeyPassHook_nss_type PQgetSSLKeyPassHook_nss(void);
+</synopsis>
+      </para>
+
+      <para>
+        <function>PQgetSSLKeyPassHook_nss</function> is only available
+        when the server was compiled with <productname>nss</productname>
+        support.
+      </para>
+
      </listitem>
     </varlistentry>
 
@@ -2497,6 +2569,8 @@ void *PQsslStruct(const PGconn *conn, const char *struct_name);
       </para>
       <para>
        The struct(s) available depend on the SSL implementation in use.
+      </para>
+      <para>
        For <productname>OpenSSL</productname>, there is one struct,
        available under the name "OpenSSL", and it returns a pointer to the
        <productname>OpenSSL</productname> <literal>SSL</literal> struct.
@@ -2520,9 +2594,14 @@ void *PQsslStruct(const PGconn *conn, const char *struct_name);
 ]]></programlisting>
       </para>
       <para>
-       This structure can be used to verify encryption levels, check server
-       certificates, and more. Refer to the <productname>OpenSSL</productname>
-       documentation for information about this structure.
+       For <productname>NSS</productname>, there is one struct available under
+       the name "NSS", and it returns a pointer to the
+       <productname>NSS</productname> <literal>PRFileDesc</literal>.
+      </para>
+      <para>
+       These structures can be used to verify encryption levels, check server
+       certificates, and more. Refer to the <acronym>SSL</acronym> library
+       documentation for information about these structures.
       </para>
      </listitem>
     </varlistentry>
@@ -2549,6 +2628,10 @@ void *PQgetssl(const PGconn *conn);
        <xref linkend="libpq-PQsslInUse"/> instead, and for more details about the
        connection, use <xref linkend="libpq-PQsslAttribute"/>.
       </para>
+      <para>
+       This function returns <literal>NULL</literal> when <acronym>SSL</acronym>
+       librariaes other than <productname>OpenSSL</productname> are used.
+      </para>
      </listitem>
     </varlistentry>
 
@@ -7982,6 +8065,11 @@ void PQinitOpenSSL(int do_ssl, int do_crypto);
        before first opening a database connection.  Also be sure that you
        have done that initialization before opening a database connection.
       </para>
+
+      <para>
+       This function does nothing when using <productname>NSS</productname> as
+       the <acronym>SSL</acronym> library.
+      </para>
      </listitem>
     </varlistentry>
 
@@ -8008,6 +8096,11 @@ void PQinitSSL(int do_ssl);
        might be preferable for applications that need to work with older
        versions of <application>libpq</application>.
       </para>
+
+      <para>
+       This function does nothing when using <productname>NSS</productname> as
+       the <acronym>SSL</acronym> library.
+      </para>
      </listitem>
     </varlistentry>
    </variablelist>
diff --git a/doc/src/sgml/runtime.sgml b/doc/src/sgml/runtime.sgml
index bf877c0e0c..2578ee8c06 100644
--- a/doc/src/sgml/runtime.sgml
+++ b/doc/src/sgml/runtime.sgml
@@ -2185,15 +2185,21 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
 
   <indexterm zone="ssl-tcp">
    <primary>SSL</primary>
+   <secondary>TLS</secondary>
   </indexterm>
 
   <para>
    <productname>PostgreSQL</productname> has native support for using
    <acronym>SSL</acronym> connections to encrypt client/server communications
    for increased security. This requires that
-   <productname>OpenSSL</productname> is installed on both client and
+   a supported TLS library is installed on both client and
    server systems and that support in <productname>PostgreSQL</productname> is
    enabled at build time (see <xref linkend="installation"/>).
+   Supported libraries are <productname>OpenSSL</productname> and
+   <productname>NSS</productname>. The terms <acronym>SSL</acronym> and
+   <acronym>TLS</acronym> are often used interchangeably to mean a secure
+   connection using a <acronym>TLS</acronym> protocol, even though
+   <acronym>SSL</acronym> protocols are no longer supported.
   </para>
 
   <sect2 id="ssl-setup">
@@ -2213,8 +2219,13 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
   </para>
 
   <para>
-   To start in <acronym>SSL</acronym> mode, files containing the server certificate
-   and private key must exist.  By default, these files are expected to be
+   To start in <acronym>SSL</acronym> mode, a server certificate
+   and private key must exist. The below sections on the different libraries
+   will discuss how to configure these.
+  </para>
+   
+  <para>
+   By default, these files are expected to be
    named <filename>server.crt</filename> and <filename>server.key</filename>, respectively, in
    the server's data directory, but other names and locations can be specified
    using the configuration parameters <xref linkend="guc-ssl-cert-file"/>
@@ -2304,6 +2315,18 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
   </note>
   </sect2>
 
+  <sect2 id="ssl-nss-config">
+   <title>NSS Configuration</title>
+
+  <para>
+   <productname>PostgreSQL</productname> will look for certificates and keys
+   in the <productname>NSS</productname> database specified by the parameter
+   <xref linkend="guc-ssl-database"/> in <filename>postgresql.conf</filename>.
+   The parameters for certificate and key filenames are used to identify the
+   nicknames in the database.
+  </para>
+  </sect2>
+
   <sect2 id="ssl-client-certificates">
    <title>Using Client Certificates</title>
 
@@ -2378,7 +2401,7 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
   </sect2>
 
   <sect2 id="ssl-server-files">
-   <title>SSL Server File Usage</title>
+   <title>SSL Server File Parameter Usage</title>
 
    <para>
     <xref linkend="ssl-file-usage"/> summarizes the files that are
@@ -2425,6 +2448,14 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
       <entry>client certificate must not be on this list</entry>
      </row>
 
+     <row>
+      <entry><xref linkend="guc-ssl-database"/></entry>
+      <entry>certificate database</entry>
+      <entry>contains server certificates, keys and revocation lists; only
+      used when <productname>PostgreSQL</productname> is built with support
+      for <productname>NSS</productname>.</entry>
+     </row>
+
     </tbody>
    </tgroup>
   </table>
@@ -2448,7 +2479,7 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
   </sect2>
 
   <sect2 id="ssl-certificate-creation">
-   <title>Creating Certificates</title>
+   <title>Creating Certificates with OpenSSL</title>
 
    <para>
      To create a simple self-signed certificate for the server, valid for 365
@@ -2552,6 +2583,88 @@ openssl x509 -req -in server.csr -text -days 365 \
    </para>
   </sect2>
 
+  <sect2 id="nss-certificate-database">
+   <title>NSS Certificate Databases</title>
+
+   <para>
+    When using <productname>NSS</productname>, all certificates and keys must
+    be loaded into an <productname>NSS</productname> certificate database.
+   </para>
+
+   <para>
+    To create a new <productname>NSS</productname> certificate database and
+    load the certificates created in <xref linkend="ssl-certificate-creation" />,
+    use the following <productname>NSS</productname> commands:
+<programlisting>
+certutil -d "sql:server.db" -N --empty-password
+certutil -d "sql:server.db" -A -n server.crt -i server.crt -t "CT,C,C"
+certutil -d "sql:server.db" -A -n root.crt -i root.crt -t "CT,C,C"
+</programlisting>
+    This will give the certificate the filename as the nickname identifier in
+    the database which is created as <filename>server.db</filename>.
+   </para>
+   <para>
+    Then load the server key, which require converting it to
+    <acronym>PKCS#12</acronym> format using the
+    <productname>OpenSSL</productname> tools:
+<programlisting>
+openssl pkcs12 -export -out server.pfx -inkey server.key -in server.crt \
+  -certfile root.crt -passout pass:
+pk12util -i server.pfx -d server.db -W ''
+</programlisting>
+   </para>
+   <para>
+    Finally a certificate revocation list can be loaded with the following
+    commands:
+<programlisting>
+crlutil -I -i server.crl -d server.db -B
+</programlisting>
+   </para>
+  </sect2>
+
+  <sect2 id="nss-ssl-certificate-creation" />
+   <title>Creating Certificates with NSS</title>
+
+   <para>
+    To create a simple self-signed CA and certificate for the server, use the
+    following NSS commands. Replace
+    <replaceable>*.yourdomain.com</replaceable> with the server's host
+    name. Remove <replaceable>--empty-password</replaceable> in order to set
+    a password protecting the databases. The password can be passed to
+    <application>certutil</certutil> with the <literal>-f</literal> parameter.
+    First create a self-signed CA. To use a different certificate validity
+    time than the default, use <replaceable>-v</replaceable> to specify the
+    number of months of validity.
+<programlisting>
+mkdir root_ca.db
+certutil -N -d "sql:root_ca.db/" --empty-password
+certutil -S -d "sql:root_ca.db/" -n root_ca -s "CN=<replaceable>ca.yourdomain.com</replaceable>" \
+  -x -k rsa -g 2048 -m <replaceable>5432</replaceable> -t CTu,CTu,CTu \
+  --keyUsage certSigning -2 --nsCertType sslCA,smimeCA,objectSigningCA \
+  -Z SHA256
+certutil -L -d "sql:root_ca.db/" -n root_ca -a > root_ca.pem
+</programlisting>
+    Now create a server certificate database, and create a certificate signing
+    request for the CA. Then sign the request with the already created CA and
+    insert the certificate chain into the certificate database.
+<programlisting>
+mkdir server_cert.db
+certutil -N -d "sql:server_cert.db/" --empty-password
+certutil -R -d "sql:server_cert.db/" -s "CN=dbhost.yourdomain.com" \
+  -o server_cert.csr -g 2048 -Z SHA256
+
+certutil -C -d "sql:root_ca.db/" -c root_ca -i server_cert.csr \
+  -o server_cert.der -m <replaceable>5433</replaceable> \
+  --keyUsage keyEncipherment,dataEncipherment,digitalSignature \
+  --nsCertType sslServer -Z SHA256
+
+certutil -A -d "sql:server_cert.db/" -n root_ca -t CTu,CTu,CTu -a -i root_ca.pem
+certutil -A -d "sql:server_cert.db/" -n server_cert -t CTu,CTu,CTu -i server_cert.der
+</programlisting>
+    The server certificate is loaded into the certificate database as well as
+    the CA certificate in order to provide the chain of certificates.
+  </sect2>
+
  </sect1>
 
  <sect1 id="gssapi-enc">
-- 
2.21.1 (Apple Git-122.3)

From e985581373ed8f7e925c3721bff5d24b307124ac Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Wed, 28 Oct 2020 11:24:02 +0100
Subject: [PATCH v23 4/8] NSS pg_strong_random support

---
 configure                   |  1 +
 configure.ac                |  1 +
 src/include/pg_config.h.in  |  3 +++
 src/port/pg_strong_random.c | 50 ++++++++++++++++++++++++++++++++++++-
 4 files changed, 54 insertions(+), 1 deletion(-)

diff --git a/configure b/configure
index 143726c79c..2b83914289 100755
--- a/configure
+++ b/configure
@@ -18422,6 +18422,7 @@ $as_echo "NSS" >&6; }
 elif test x"$PORTNAME" = x"win32" ; then
   { $as_echo "$as_me:${as_lineno-$LINENO}: result: Windows native" >&5
 $as_echo "Windows native" >&6; }
+
 else
   { $as_echo "$as_me:${as_lineno-$LINENO}: result: /dev/urandom" >&5
 $as_echo "/dev/urandom" >&6; }
diff --git a/configure.ac b/configure.ac
index 59657a6010..6533e10ffd 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2197,6 +2197,7 @@ elif test x"$with_ssl" = x"nss" ; then
   AC_MSG_RESULT([NSS])
 elif test x"$PORTNAME" = x"win32" ; then
   AC_MSG_RESULT([Windows native])
+
 else
   AC_MSG_RESULT([/dev/urandom])
   AC_CHECK_FILE([/dev/urandom], [], [])
diff --git a/src/include/pg_config.h.in b/src/include/pg_config.h.in
index 8856a33590..fa5a977617 100644
--- a/src/include/pg_config.h.in
+++ b/src/include/pg_config.h.in
@@ -908,6 +908,9 @@
 /* Define to build with NSS support (--with-ssl=nss) */
 #undef USE_NSS
 
+/* Define to use NSS for random number generation */
+#undef USE_NSS_RANDOM
+
 /* Define to 1 to use software CRC-32C implementation (slicing-by-8). */
 #undef USE_SLICING_BY_8_CRC32C
 
diff --git a/src/port/pg_strong_random.c b/src/port/pg_strong_random.c
index 07f24c0089..40de237628 100644
--- a/src/port/pg_strong_random.c
+++ b/src/port/pg_strong_random.c
@@ -137,7 +137,55 @@ pg_strong_random(void *buf, size_t len)
 	return false;
 }
 
-#else							/* not USE_OPENSSL or WIN32 */
+#elif defined(USE_NSS)
+
+#define pg_BITS_PER_BYTE BITS_PER_BYTE
+#undef BITS_PER_BYTE
+#define NO_NSPR_10_SUPPORT
+#include <nss/nss.h>
+#include <nss/pk11pub.h>
+#if defined(BITS_PER_BYTE)
+#if BITS_PER_BYTE != pg_BITS_PER_BYTE
+#error "incompatible byte widths between NSPR and postgres"
+#endif
+#else
+#define BITS_PER_BYTE pg_BITS_PER_BYTE
+#endif
+#undef pg_BITS_PER_BYTE
+
+void
+pg_strong_random_init(void)
+{
+	/* No initialization needed on NSS */
+}
+
+bool
+pg_strong_random(void *buf, size_t len)
+{
+	NSSInitParameters params;
+	NSSInitContext *nss_context;
+	SECStatus	status;
+
+	memset(&params, 0, sizeof(params));
+	params.length = sizeof(params);
+	nss_context = NSS_InitContext("", "", "", "", &params,
+								  NSS_INIT_READONLY | NSS_INIT_NOCERTDB |
+								  NSS_INIT_NOMODDB | NSS_INIT_FORCEOPEN |
+								  NSS_INIT_NOROOTINIT | NSS_INIT_PK11RELOAD);
+
+	if (!nss_context)
+		return false;
+
+	status = PK11_GenerateRandom(buf, len);
+	NSS_ShutdownContext(nss_context);
+
+	if (status == SECSuccess)
+		return true;
+
+	return false;
+}
+
+#else							/* not USE_OPENSSL, USE_NSS or WIN32 */
 
 /*
  * Without OpenSSL or Win32 support, just read /dev/urandom ourselves.
-- 
2.21.1 (Apple Git-122.3)

From 411ac43db0dff3c2e138afc8cb18828992000810 Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Wed, 28 Oct 2020 11:22:26 +0100
Subject: [PATCH v23 3/8] NSS Testharness updates

TODO:
	* Generate certificate/keys with NSS tooling for NSS specific test
	* Add test for certificate with embedded nulls
	* Fix SCRAM tests when channel binding works
---
 src/test/ssl/Makefile                         | 233 ++++++++++++
 src/test/ssl/t/001_ssltests.pl                | 346 +++++++++++-------
 src/test/ssl/t/002_scram.pl                   |  97 +++--
 src/test/ssl/t/SSL/Backend/NSS.pm             |  73 ++++
 src/test/ssl/t/SSL/Backend/OpenSSL.pm         | 103 ++++++
 .../ssl/t/{SSLServer.pm => SSL/Server.pm}     |  80 +++-
 6 files changed, 743 insertions(+), 189 deletions(-)
 create mode 100644 src/test/ssl/t/SSL/Backend/NSS.pm
 create mode 100644 src/test/ssl/t/SSL/Backend/OpenSSL.pm
 rename src/test/ssl/t/{SSLServer.pm => SSL/Server.pm} (78%)

diff --git a/src/test/ssl/Makefile b/src/test/ssl/Makefile
index d545382eea..d275c89672 100644
--- a/src/test/ssl/Makefile
+++ b/src/test/ssl/Makefile
@@ -30,6 +30,35 @@ SSLFILES := $(CERTIFICATES:%=ssl/%.key) $(CERTIFICATES:%=ssl/%.crt) \
 	ssl/client+client_ca.crt ssl/client-der.key \
 	ssl/client-encrypted-pem.key ssl/client-encrypted-der.key
 
+# Even though we in practice could get away with far fewer NSS databases, they
+# are generated to mimic the setup for the OpenSSL tests in order to ensure
+# we isolate the same behavior between the backends. The database name should
+# contain the files included for easier test suite code reading.
+NSSFILES := ssl/nss/client_ca.crt.db \
+	ssl/nss/server_ca.crt.db \
+	ssl/nss/root+server_ca.crt.db \
+	ssl/nss/root+client_ca.crt.db \
+	ssl/nss/client.crt__client.key.db \
+	ssl/nss/client-revoked.crt__client-revoked.key.db \
+	ssl/nss/server-cn-only.crt__server-password.key.db \
+	ssl/nss/server-cn-only.crt__server-cn-only.key.db \
+	ssl/nss/root.crl \
+	ssl/nss/server.crl \
+	ssl/nss/client.crl \
+	ssl/nss/server-multiple-alt-names.crt__server-multiple-alt-names.key.db \
+	ssl/nss/server-single-alt-name.crt__server-single-alt-name.key.db \
+	ssl/nss/server-cn-and-alt-names.crt__server-cn-and-alt-names.key.db \
+	ssl/nss/server-no-names.crt__server-no-names.key.db \
+	ssl/nss/server-revoked.crt__server-revoked.key.db \
+	ssl/nss/root+client.crl \
+	ssl/nss/client+client_ca.crt__client.key.db \
+	ssl/nss/client.crt__client-encrypted-pem.key.db \
+	ssl/nss/root+server_ca.crt__server.crl.db \
+	ssl/nss/root+server_ca.crt__root+server.crl.db \
+	ssl/nss/native_ca-root.db \
+	ssl/nss/native_server-root.db \
+	ssl/nss/native_client-root.db
+
 # This target re-generates all the key and certificate files. Usually we just
 # use the ones that are committed to the tree without rebuilding them.
 #
@@ -37,6 +66,10 @@ SSLFILES := $(CERTIFICATES:%=ssl/%.key) $(CERTIFICATES:%=ssl/%.crt) \
 #
 sslfiles: $(SSLFILES)
 
+# Generate NSS certificate databases corresponding to the OpenSSL certificates.
+# This target will fail unless preceded by nssfiles-clean.
+nssfiles: $(NSSFILES)
+
 # OpenSSL requires a directory to put all generated certificates in. We don't
 # use this for anything, but we need a location.
 ssl/new_certs_dir:
@@ -64,6 +97,24 @@ ssl/%_ca.crt: ssl/%_ca.key %_ca.config ssl/root_ca.crt ssl/new_certs_dir
 	rm ssl/temp_ca.crt ssl/temp_ca_signed.crt
 	echo "01" > ssl/$*_ca.srl
 
+ssl/nss/%_ca.crt.db: ssl/%_ca.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n $*_ca.crt -i ssl/$*_ca.crt -t "CT,C,C"
+
+ssl/nss/root+server_ca.crt__server.crl.db: ssl/root+server_ca.crt ssl/nss/server.crl
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	crlutil -I -i ssl/nss/server.crl -d $@ -B
+
+ssl/nss/root+server_ca.crt__root+server.crl.db: ssl/root+server_ca.crt ssl/nss/root.crl ssl/nss/server.crl
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	crlutil -I -i ssl/nss/root.crl -d $@ -B
+	crlutil -I -i ssl/nss/server.crl -d $@ -B
+
 # Server certificates, signed by server CA:
 ssl/server-%.crt: ssl/server-%.key ssl/server_ca.crt server-%.config
 	openssl req -new -key ssl/server-$*.key -out ssl/server-$*.csr -config server-$*.config
@@ -77,6 +128,78 @@ ssl/server-ss.crt: ssl/server-cn-only.key ssl/server-cn-only.crt server-cn-only.
 	openssl x509 -req -days 10000 -in ssl/server-ss.csr -signkey ssl/server-cn-only.key -out ssl/server-ss.crt  -extensions v3_req -extfile server-cn-only.config
 	rm ssl/server-ss.csr
 
+# pk12util won't preserve the password when importing the password protected
+# key, the password must be set on the database *before* importing it as the
+# password in the pkcs12 envelope will be dropped.
+ssl/nss/server-cn-only.crt__server-password.key.db: ssl/server-cn-only.crt
+	$(MKDIR_P) $@
+	echo "secret1" > password.txt
+	certutil -d "sql:$@" -N -f password.txt
+	certutil -d "sql:$@" -A -n ssl/server-cn-only.crt -i ssl/server-cn-only.crt -t "CT,C,C" -f password.txt
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C" -f password.txt
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C" -f password.txt
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C" -f password.txt
+	openssl pkcs12 -export -out ssl/nss/server-password.pfx -inkey ssl/server-password.key -in ssl/server-cn-only.crt -certfile ssl/server_ca.crt -passin 'pass:secret1' -passout 'pass:secret1'
+	pk12util -i ssl/nss/server-password.pfx -d "sql:$@" -W 'secret1' -K 'secret1'
+
+ssl/nss/server-cn-only.crt__server-cn-only.key.db: ssl/server-cn-only.crt ssl/server-cn-only.key
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-cn-only.crt -i ssl/server-cn-only.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-cn-only.pfx -inkey ssl/server-cn-only.key -in ssl/server-cn-only.crt -certfile ssl/server_ca.crt -passout pass:
+	pk12util -i ssl/nss/server-cn-only.pfx -d "sql:$@" -W ''
+
+ssl/nss/server-multiple-alt-names.crt__server-multiple-alt-names.key.db: ssl/server-multiple-alt-names.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-multiple-alt-names.crt -i ssl/server-multiple-alt-names.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-multiple-alt-names.pfx -inkey ssl/server-multiple-alt-names.key -in ssl/server-multiple-alt-names.crt -certfile ssl/server-multiple-alt-names.crt -passout pass:
+	pk12util -i ssl/nss/server-multiple-alt-names.pfx -d "sql:$@" -W ''
+
+ssl/nss/server-single-alt-name.crt__server-single-alt-name.key.db: ssl/server-single-alt-name.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-single-alt-name.crt -i ssl/server-single-alt-name.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-single-alt-name.pfx -inkey ssl/server-single-alt-name.key -in ssl/server-single-alt-name.crt -certfile ssl/server-single-alt-name.crt -passout pass:
+	pk12util -i ssl/nss/server-single-alt-name.pfx -d "sql:$@" -W ''
+
+ssl/nss/server-cn-and-alt-names.crt__server-cn-and-alt-names.key.db: ssl/server-cn-and-alt-names.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-cn-and-alt-names.crt -i ssl/server-cn-and-alt-names.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-cn-and-alt-names.pfx -inkey ssl/server-cn-and-alt-names.key -in ssl/server-cn-and-alt-names.crt -certfile ssl/server-cn-and-alt-names.crt -passout pass:
+	pk12util -i ssl/nss/server-cn-and-alt-names.pfx -d $@ -W ''
+
+ssl/nss/server-no-names.crt__server-no-names.key.db: ssl/server-no-names.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-no-names.crt -i ssl/server-no-names.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-no-names.pfx -inkey ssl/server-no-names.key -in ssl/server-no-names.crt -certfile ssl/server-no-names.crt -passout pass:
+	pk12util -i ssl/nss/server-no-names.pfx -d "sql:$@" -W ''
+
+ssl/nss/server-revoked.crt__server-revoked.key.db: ssl/server-revoked.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-revoked.crt -i ssl/server-revoked.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-revoked.pfx -inkey ssl/server-revoked.key -in ssl/server-revoked.crt -certfile ssl/server-revoked.crt -passout pass:
+	pk12util -i ssl/nss/server-revoked.pfx -d "sql:$@" -W ''
+
 # Password-protected version of server-cn-only.key
 ssl/server-password.key: ssl/server-cn-only.key
 	openssl rsa -aes256 -in $< -out $@ -passout 'pass:secret1'
@@ -88,6 +211,27 @@ ssl/client.crt: ssl/client.key ssl/client_ca.crt
 	openssl x509 -in ssl/temp.crt -out ssl/client.crt # to keep just the PEM cert
 	rm ssl/client.csr ssl/temp.crt
 
+# Client certificate, signed by client CA
+ssl/nss/client.crt__client.key.db: ssl/client.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/client.crt -i ssl/client.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root+client_ca.crt -i ssl/root+client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client.pfx -inkey ssl/client.key -in ssl/client.crt -certfile ssl/client_ca.crt -passout pass:
+	pk12util -i ssl/nss/client.pfx -d "sql:$@" -W ''
+
+# Client certificate with encrypted key, signed by client CA
+ssl/nss/client.crt__client-encrypted-pem.key.db: ssl/client.crt
+	$(MKDIR_P) $@
+	echo 'dUmmyP^#+' > $@.pass
+	certutil -d "sql:$@" -N -f $@.pass
+	certutil -d "sql:$@" -A -f $@.pass -n ssl/client.crt -i ssl/client.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -f $@.pass -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -f $@.pass -n root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client-encrypted-pem.pfx -inkey ssl/client-encrypted-pem.key -in ssl/client.crt -certfile ssl/client_ca.crt -passin pass:'dUmmyP^#+' -passout pass:'dUmmyP^#+'
+	pk12util -i ssl/nss/client-encrypted-pem.pfx -d "sql:$@" -W 'dUmmyP^#+' -k $@.pass
+
 # Another client certificate, signed by the client CA. This one is revoked.
 ssl/client-revoked.crt: ssl/client-revoked.key ssl/client_ca.crt client.config
 	openssl req -new -key ssl/client-revoked.key -out ssl/client-revoked.csr -config client.config
@@ -95,6 +239,14 @@ ssl/client-revoked.crt: ssl/client-revoked.key ssl/client_ca.crt client.config
 	openssl x509 -in ssl/temp.crt -out ssl/client-revoked.crt # to keep just the PEM cert
 	rm ssl/client-revoked.csr ssl/temp.crt
 
+ssl/nss/client-revoked.crt__client-revoked.key.db: ssl/client-revoked.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/client-revoked.crt -i ssl/client-revoked.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client-revoked.pfx -inkey ssl/client-revoked.key -in ssl/client-revoked.crt -certfile ssl/client_ca.crt -passout pass:
+	pk12util -i ssl/nss/client-revoked.pfx -d "sql:$@" -W ''
+
 # Convert the key to DER, to test our behaviour there too
 ssl/client-der.key: ssl/client.key
 	openssl rsa -in ssl/client.key -outform DER -out ssl/client-der.key
@@ -127,19 +279,40 @@ ssl/root+client_ca.crt: ssl/root_ca.crt ssl/client_ca.crt
 ssl/client+client_ca.crt: ssl/client.crt ssl/client_ca.crt
 	cat $^ > $@
 
+# Client certificate, signed by client CA
+ssl/nss/client+client_ca.crt__client.key.db: ssl/client+client_ca.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/client+client_ca.crt -i ssl/client+client_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n ssl/root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client.pfx -inkey ssl/client.key -in ssl/client.crt -certfile ssl/client_ca.crt -passout pass:
+	pk12util -i ssl/nss/client.pfx -d "sql:$@" -W ''
+
 #### CRLs
 
 ssl/client.crl: ssl/client-revoked.crt
 	openssl ca -config cas.config -name client_ca -revoke ssl/client-revoked.crt
 	openssl ca -config cas.config -name client_ca -gencrl -out ssl/client.crl
 
+ssl/nss/client.crl: ssl/client.crl
+	openssl crl -in $^ -outform der -out $@
+
 ssl/server.crl: ssl/server-revoked.crt
 	openssl ca -config cas.config -name server_ca -revoke ssl/server-revoked.crt
 	openssl ca -config cas.config -name server_ca -gencrl -out ssl/server.crl
 
+ssl/nss/server.crl: ssl/server.crl
+	openssl crl -in $^ -outform der -out $@
+
 ssl/root.crl: ssl/root_ca.crt
 	openssl ca -config cas.config -name root_ca -gencrl -out ssl/root.crl
 
+ssl/nss/root.crl: ssl/root.crl
+	openssl crl -in $^ -outform der -out $@
+
+ssl/nss/root+client.crl: ssl/root+client.crl
+	openssl crl -in $^ -outform der -out $@
+
 # If a CRL is used, OpenSSL requires a CRL file for *all* the CAs in the
 # chain, even if some of them are empty.
 ssl/root+server.crl: ssl/root.crl ssl/server.crl
@@ -147,13 +320,73 @@ ssl/root+server.crl: ssl/root.crl ssl/server.crl
 ssl/root+client.crl: ssl/root.crl ssl/client.crl
 	cat $^ > $@
 
+#### NSS specific certificates and keys
+
+#NSSFILES2 := ssl/nss/native_ca-root.db \
+#	ssl/nss/native_server-root.db \
+#	ssl/nss/native_client-root.db
+
+#nssfiles2: $(NSSFILES2)
+
+ssl/nss/native_ca-%.db:
+	$(MKDIR_P) ssl/nss/native_ca-$*.db
+	certutil -N -d "sql:ssl/nss/native_ca-$*.db/" --empty-password
+	echo y > nss_ca_params.txt
+	echo 10 >> nss_ca_params.txt
+	echo y >> nss_ca_params.txt
+	cat nss_ca_params.txt | certutil -S -d "sql:ssl/nss/native_ca-$*.db/" -n ca-$* \
+	-s "CN=Test CA for PostgreSQL SSL regression tests,OU=PostgreSQL test suite" \
+	-x -k rsa -g 2048 -m 5432 -t CTu,CTu,CTu \
+	--keyUsage certSigning -2 --nsCertType sslCA,smimeCA,objectSigningCA \
+	-z Makefile -Z SHA256
+	rm nss_ca_params.txt
+
+ssl/nss/native_ca-%.pem: ssl/nss/native_ca-%.db
+	certutil -L -d "sql:ssl/nss/native_ca-$*.db/" -n ca-$* -a > ssl/nss/native_ca-$*.pem
+
+# Create and sign a server certificate
+ssl/nss/native_server-%.db: ssl/nss/native_ca-%.pem
+	$(MKDIR_P) ssl/nss/native_server-$*.db
+	certutil -N -d "sql:ssl/nss/native_server-$*.db/" --empty-password
+	certutil -R -d "sql:ssl/nss/native_server-$*.db/" \
+		-s "CN=common-name.pg-ssltest.test,OU=PostgreSQL test suite" \
+		-o ssl/nss/native_server-$*.csr -g 2048 -Z SHA256 -z Makefile
+	echo 1 > nss_server_params.txt
+	echo 9 >> nss_server_params.txt
+	cat nss_server_params.txt | certutil -C -d "sql:ssl/nss/native_ca-$*.db/" -c ca-root -i ssl/nss/native_server-$*.csr \
+		-o ssl/nss/native_server_$*.der -m 5433 --keyUsage dataEncipherment,digitalSignature,keyEncipherment \
+		--nsCertType sslServer --certVersion 1 -Z SHA256
+	certutil -A -d "sql:ssl/nss/native_server-$*.db/" -n ca-$* -t CTu,CTu,CTu -a -i ssl/nss/native_ca-$*.pem
+	certutil -A -d "sql:ssl/nss/native_server-$*.db/" -n ssl/native_server-$*.crt -t CTu,CTu,CTu -i ssl/nss/native_server_$*.der
+	rm nss_server_params.txt
+
+# Create and sign a client certificate
+ssl/nss/native_client-%.db: ssl/nss/native_ca-%.pem
+	$(MKDIR_P) ssl/nss/native_client-$*.db
+	certutil -N -d "sql:ssl/nss/native_client-$*.db/" --empty-password
+	certutil -R -d "sql:ssl/nss/native_client-$*.db/" -s "CN=ssltestuser,OU=PostgreSQL test suite" \
+		-o ssl/nss/native_client-$*.csr -g 2048 -Z SHA256 -z Makefile
+	certutil -C -d "sql:ssl/nss/native_ca-$*.db/" -c ca-$* -i ssl/nss/native_client-$*.csr -o ssl/nss/native_client-$*.der \
+		-m 5434 --keyUsage keyEncipherment,dataEncipherment,digitalSignature --nsCertType sslClient \
+		--certVersion 1 -Z SHA256
+	certutil -A -d "sql:ssl/nss/native_client-$*.db" -n ca-$* -t CTu,CTu,CTu -a -i ssl/nss/native_ca-$*.pem
+	certutil -A -d "sql:ssl/nss/native_client-$*.db" -n native_client-$* -t CTu,CTu,CTu -i ssl/nss/native_client-$*.der
+
+nssfiles2clean:
+	rm -rf ssl/nss
+
 .PHONY: sslfiles-clean
 sslfiles-clean:
 	rm -f $(SSLFILES) ssl/client_ca.srl ssl/server_ca.srl ssl/client_ca-certindex* ssl/server_ca-certindex* ssl/root_ca-certindex* ssl/root_ca.srl ssl/temp_ca.crt ssl/temp_ca_signed.crt
 
+.PHONY: nssfiles-clean
+nssfiles-clean:
+	rm -rf ssl/nss
+
 clean distclean maintainer-clean:
 	rm -rf tmp_check
 	rm -rf ssl/*.old ssl/new_certs_dir ssl/client*_tmp.key
+	rm -rf ssl/nss
 
 # Doesn't depend on $(SSLFILES) because we don't rebuild them by default
 check:
diff --git a/src/test/ssl/t/001_ssltests.pl b/src/test/ssl/t/001_ssltests.pl
index fd2727b568..6b8bca2846 100644
--- a/src/test/ssl/t/001_ssltests.pl
+++ b/src/test/ssl/t/001_ssltests.pl
@@ -4,17 +4,24 @@ use PostgresNode;
 use TestLib;
 use Test::More;
 
-use File::Copy;
-
 use FindBin;
 use lib $FindBin::RealBin;
 
-use SSLServer;
+use SSL::Server;
+
+my $openssl;
+my $nss;
 
-if ($ENV{with_openssl} eq 'yes')
+if ($ENV{with_ssl} eq 'openssl')
 {
+	$openssl = 1;
 	plan tests => 93;
 }
+elsif ($ENV{with_ssl} eq 'nss')
+{
+	$nss = 1;
+	plan tests => 99;
+}
 else
 {
 	plan skip_all => 'SSL not supported by this build';
@@ -32,32 +39,6 @@ my $SERVERHOSTCIDR = '127.0.0.1/32';
 # Allocation of base connection string shared among multiple tests.
 my $common_connstr;
 
-# The client's private key must not be world-readable, so take a copy
-# of the key stored in the code tree and update its permissions.
-#
-# This changes ssl/client.key to ssl/client_tmp.key etc for the rest
-# of the tests.
-my @keys = (
-	"client",     "client-revoked",
-	"client-der", "client-encrypted-pem",
-	"client-encrypted-der");
-foreach my $key (@keys)
-{
-	copy("ssl/${key}.key", "ssl/${key}_tmp.key")
-	  or die
-	  "couldn't copy ssl/${key}.key to ssl/${key}_tmp.key for permissions change: $!";
-	chmod 0600, "ssl/${key}_tmp.key"
-	  or die "failed to change permissions on ssl/${key}_tmp.key: $!";
-}
-
-# Also make a copy of that explicitly world-readable.  We can't
-# necessarily rely on the file in the source tree having those
-# permissions.  Add it to @keys to include it in the final clean
-# up phase.
-copy("ssl/client.key", "ssl/client_wrongperms_tmp.key");
-chmod 0644, "ssl/client_wrongperms_tmp.key";
-push @keys, 'client_wrongperms';
-
 #### Set up the server.
 
 note "setting up data directory";
@@ -72,36 +53,65 @@ $node->start;
 
 # Run this before we lock down access below.
 my $result = $node->safe_psql('postgres', "SHOW ssl_library");
-is($result, 'OpenSSL', 'ssl_library parameter');
+is($result, SSL::Server::ssl_library(), 'ssl_library parameter');
 
 configure_test_server_for_ssl($node, $SERVERHOSTADDR, $SERVERHOSTCIDR,
 	'trust');
 
 note "testing password-protected keys";
 
-open my $sslconf, '>', $node->data_dir . "/sslconfig.conf";
-print $sslconf "ssl=on\n";
-print $sslconf "ssl_cert_file='server-cn-only.crt'\n";
-print $sslconf "ssl_key_file='server-password.key'\n";
-print $sslconf "ssl_passphrase_command='echo wrongpassword'\n";
-close $sslconf;
+# Since the passphrase callbacks operate at different stages in OpenSSL and
+# NSS we have two separate blocks for them.
+SKIP:
+{
+	skip "Certificate passphrases aren't checked on server restart in NSS", 2
+	  if ($nss);
+
+	set_server_cert($node, 'server-cn-only', 'root+client_ca',
+					   'server-password', 'echo wrongpassword');
+	command_fails(
+		[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
+		'restart fails with password-protected key file with wrong password');
+	$node->_update_pid(0);
+
+	set_server_cert($node, 'server-cn-only', 'root+client_ca',
+					'server-password', 'echo secret1');
+	command_ok(
+		[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
+		'restart succeeds with password-protected key file');
+	$node->_update_pid(1);
+}
 
-command_fails(
-	[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
-	'restart fails with password-protected key file with wrong password');
-$node->_update_pid(0);
+SKIP:
+{
+	skip "Certificate passphrases are checked on connection in NSS", 5
+	  if ($openssl);
 
-open $sslconf, '>', $node->data_dir . "/sslconfig.conf";
-print $sslconf "ssl=on\n";
-print $sslconf "ssl_cert_file='server-cn-only.crt'\n";
-print $sslconf "ssl_key_file='server-password.key'\n";
-print $sslconf "ssl_passphrase_command='echo secret1'\n";
-close $sslconf;
+	set_server_cert($node, 'server-cn-only', 'root+client_ca',
+					   'server-password', 'echo wrongpassword');
+	command_ok(
+		[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
+		'restart fails with password-protected key file with wrong password');
+	$node->_update_pid(1);
 
-command_ok(
-	[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
-	'restart succeeds with password-protected key file');
-$node->_update_pid(1);
+	test_connect_fails(
+		"user=ssltestuser dbname=trustdb sslcert=invalid hostaddr=$SERVERHOSTADDR host=common-name.pg-ssltest.test",
+		"sslrootcert=invalid sslmode=require",
+		qr/\QSSL error\E/,
+		"connect to server with incorrect key password configured");
+
+	set_server_cert($node, 'server-cn-only', 'root+client_ca',
+					   'server-password', 'echo secret1');
+	command_ok(
+		[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
+		'restart fails with password-protected key file with wrong password');
+	$node->_update_pid(1);
+
+	test_connect_ok(
+		"user=ssltestuser dbname=trustdb sslcert=invalid hostaddr=$SERVERHOSTADDR host=common-name.pg-ssltest.test",
+		"sslrootcert=invalid sslmode=require",
+		"connect to server with correct key password configured");
+}
 
 # Test compatibility of SSL protocols.
 # TLSv1.1 is lower than TLSv1.2, so it won't work.
@@ -149,82 +159,105 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"sslrootcert=invalid sslmode=verify-ca",
-	qr/root certificate file "invalid" does not exist/,
+	qr/root certificate file "invalid" does not exist|Peer's Certificate issuer is not recognized/,
 	"connect without server root cert sslmode=verify-ca");
 test_connect_fails(
 	$common_connstr,
 	"sslrootcert=invalid sslmode=verify-full",
-	qr/root certificate file "invalid" does not exist/,
+	qr/root certificate file "invalid" does not exist|Peer's Certificate issuer is not recognized/,
 	"connect without server root cert sslmode=verify-full");
 
 # Try with wrong root cert, should fail. (We're using the client CA as the
 # root, but the server's key is signed by the server CA.)
-test_connect_fails($common_connstr,
-	"sslrootcert=ssl/client_ca.crt sslmode=require",
-	qr/SSL error/, "connect with wrong server root cert sslmode=require");
-test_connect_fails($common_connstr,
-	"sslrootcert=ssl/client_ca.crt sslmode=verify-ca",
-	qr/SSL error/, "connect with wrong server root cert sslmode=verify-ca");
-test_connect_fails($common_connstr,
-	"sslrootcert=ssl/client_ca.crt sslmode=verify-full",
-	qr/SSL error/, "connect with wrong server root cert sslmode=verify-full");
-
-# Try with just the server CA's cert. This fails because the root file
-# must contain the whole chain up to the root CA.
-test_connect_fails($common_connstr,
-	"sslrootcert=ssl/server_ca.crt sslmode=verify-ca",
-	qr/SSL error/, "connect with server CA cert, without root CA");
+test_connect_fails(
+	$common_connstr,
+	"sslrootcert=ssl/client_ca.crt sslmode=require cert_database=ssl/nss/client_ca.crt.db",
+	qr/SSL error/,
+	"connect with wrong server root cert sslmode=require");
+test_connect_fails(
+	$common_connstr,
+	"sslrootcert=ssl/client_ca.crt sslmode=verify-ca cert_database=ssl/nss/client_ca.crt.db",
+	qr/SSL error/,
+	"connect with wrong server root cert sslmode=verify-ca");
+test_connect_fails(
+	$common_connstr,
+	"sslrootcert=ssl/client_ca.crt sslmode=verify-full cert_database=ssl/nss/client_ca.crt.db",
+	qr/SSL error/,
+	"connect with wrong server root cert sslmode=verify-full");
+
+SKIP:
+{
+	# NSS supports partial chain validation, so this test doesn't work there.
+	# This is similar to the OpenSSL option X509_V_FLAG_PARTIAL_CHAIN which
+	# we don't allow.
+	skip "NSS support partial chain validation", 2 if ($nss);
+	# Try with just the server CA's cert. This fails because the root file
+	# must contain the whole chain up to the root CA.
+	test_connect_fails($common_connstr,
+		"sslrootcert=ssl/server_ca.crt sslmode=verify-ca",
+		qr/SSL error/, "connect with server CA cert, without root CA");
+}
 
 # And finally, with the correct root cert.
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require cert_database=ssl/nss/root+server_ca.crt.db",
 	"connect with correct server CA cert file sslmode=require");
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca cert_database=ssl/nss/root+server_ca.crt.db",
 	"connect with correct server CA cert file sslmode=verify-ca");
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-full",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db",
 	"connect with correct server CA cert file sslmode=verify-full");
 
-# Test with cert root file that contains two certificates. The client should
-# be able to pick the right one, regardless of the order in the file.
-test_connect_ok(
-	$common_connstr,
-	"sslrootcert=ssl/both-cas-1.crt sslmode=verify-ca",
-	"cert root file that contains two certificates, order 1");
-test_connect_ok(
-	$common_connstr,
-	"sslrootcert=ssl/both-cas-2.crt sslmode=verify-ca",
-	"cert root file that contains two certificates, order 2");
+SKIP:
+{
+	skip "CA ordering is irrelevant in NSS databases", 2 if ($nss);
 
+	# Test with cert root file that contains two certificates. The client should
+	# be able to pick the right one, regardless of the order in the file.
+	test_connect_ok(
+		$common_connstr,
+		"sslrootcert=ssl/both-cas-1.crt sslmode=verify-ca",
+		"cert root file that contains two certificates, order 1");
+
+	# How about import the both-file into a database?
+	test_connect_ok(
+		$common_connstr,
+		"sslrootcert=ssl/both-cas-2.crt sslmode=verify-ca",
+		"cert root file that contains two certificates, order 2");
+}
 # CRL tests
 
 # Invalid CRL filename is the same as no CRL, succeeds
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=invalid",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=invalid cert_database=ssl/nss/root+server_ca.crt.db",
 	"sslcrl option with invalid file name");
 
-# A CRL belonging to a different CA is not accepted, fails
-test_connect_fails(
-	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/client.crl",
-	qr/SSL error/,
-	"CRL belonging to a different CA");
+SKIP:
+{
+	skip "CRL's are verified when adding to NSS database", 2 if ($nss);
+	# A CRL belonging to a different CA is not accepted, fails
+	test_connect_fails(
+		$common_connstr,
+		"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/client.crl",
+		qr/SSL error/,
+		"CRL belonging to a different CA");
+}
 
 # With the correct CRL, succeeds (this cert is not revoked)
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/root+server.crl",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/root+server.crl cert_database=ssl/nss/root+server_ca.crt__root+server.crl.db",
 	"CRL with a non-revoked cert");
 
 # Check that connecting with verify-full fails, when the hostname doesn't
 # match the hostname in the server's certificate.
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -237,14 +270,14 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"sslmode=verify-full host=wronghost.test",
-	qr/\Qserver certificate for "common-name.pg-ssltest.test" does not match host name "wronghost.test"\E/,
+	qr/\Qserver certificate for "common-name.pg-ssltest.test" does not match host name "wronghost.test"\E|requested domain name does not match the server's certificate/,
 	"mismatch between host name and server certificate sslmode=verify-full");
 
 # Test Subject Alternative Names.
 switch_server_cert($node, 'server-multiple-alt-names');
 
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -262,12 +295,12 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"host=wronghost.alt-name.pg-ssltest.test",
-	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "wronghost.alt-name.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "wronghost.alt-name.pg-ssltest.test"\E|requested domain name does not match the server's certificate/,
 	"host name not matching with X.509 Subject Alternative Names");
 test_connect_fails(
 	$common_connstr,
 	"host=deep.subdomain.wildcard.pg-ssltest.test",
-	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E|requested domain name does not match the server's certificate/,
 	"host name not matching with X.509 Subject Alternative Names wildcard");
 
 # Test certificate with a single Subject Alternative Name. (this gives a
@@ -275,7 +308,7 @@ test_connect_fails(
 switch_server_cert($node, 'server-single-alt-name');
 
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -285,12 +318,12 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"host=wronghost.alt-name.pg-ssltest.test",
-	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "wronghost.alt-name.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "wronghost.alt-name.pg-ssltest.test"\E|requested domain name does not match the server's certificate/,
 	"host name not matching with a single X.509 Subject Alternative Name");
 test_connect_fails(
 	$common_connstr,
 	"host=deep.subdomain.wildcard.pg-ssltest.test",
-	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E|requested domain name does not match the server's certificate/,
 	"host name not matching with a single X.509 Subject Alternative Name wildcard"
 );
 
@@ -299,7 +332,7 @@ test_connect_fails(
 switch_server_cert($node, 'server-cn-and-alt-names');
 
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -312,14 +345,14 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"host=common-name.pg-ssltest.test",
-	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 1 other name) does not match host name "common-name.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 1 other name) does not match host name "common-name.pg-ssltest.test"\E|requested domain name does not match the server's certificate/,
 	"certificate with both a CN and SANs ignores CN");
 
 # Finally, test a server certificate that has no CN or SANs. Of course, that's
 # not a very sensible certificate, but libpq should handle it gracefully.
 switch_server_cert($node, 'server-no-names');
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -328,7 +361,7 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"sslmode=verify-full host=common-name.pg-ssltest.test",
-	qr/could not get server's host name from server certificate/,
+	qr/could not get server's host name from server certificate|requested domain name does not match the server's certificate./,
 	"server certificate without CN or SANs sslmode=verify-full");
 
 # Test that the CRL works
@@ -340,11 +373,11 @@ $common_connstr =
 # Without the CRL, succeeds. With it, fails.
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca cert_database=ssl/nss/root+server_ca.crt.db",
 	"connects without client-side CRL");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/root+server.crl",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/server.crl cert_database=ssl/nss/root+server_ca.crt__server.crl.db",
 	qr/SSL error/,
 	"does not connect with client-side CRL");
 
@@ -365,32 +398,50 @@ command_like(
 # Test min/max SSL protocol versions.
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.2",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.2 cert_database=ssl/nss/root+server_ca.crt.db",
 	"connection success with correct range of TLS protocol versions");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.1",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.1 cert_database=ssl/nss/root+server_ca.crt.db",
 	qr/invalid SSL protocol version range/,
 	"connection failure with incorrect range of TLS protocol versions");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=incorrect_tls",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=incorrect_tls cert_database=ssl/nss/root+server_ca.crt.db",
 	qr/invalid ssl_min_protocol_version value/,
 	"connection failure with an incorrect SSL protocol minimum bound");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_max_protocol_version=incorrect_tls",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_max_protocol_version=incorrect_tls cert_database=ssl/nss/root+server_ca.crt.db",
 	qr/invalid ssl_max_protocol_version value/,
 	"connection failure with an incorrect SSL protocol maximum bound");
 
+# tests of NSS generated certificates/keys
+SKIP:
+{
+	skip "NSS specific tests",            1 if ($openssl);
+
+	switch_server_cert($node, 'native_server-root', 'native_ca-root');
+	$common_connstr =
+	  "user=ssltestuser dbname=trustdb hostaddr=$SERVERHOSTADDR host=common-name.pg-ssltest.test";
+
+	test_connect_ok(
+		$common_connstr,
+		"sslmode=require user=ssltestuser",
+		"NSS generated certificates"
+	);
+}
+
 ### Server-side tests.
 ###
 ### Test certificate authorization.
 
+switch_server_cert($node, 'server-revoked');
+
 note "running server tests";
 
 $common_connstr =
-  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR";
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client.crt__client.key.db";
 
 # no client cert
 test_connect_fails(
@@ -406,32 +457,43 @@ test_connect_ok(
 	"certificate authorization succeeds with correct client cert in PEM format"
 );
 
-# correct client cert in unencrypted DER
-test_connect_ok(
-	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-der_tmp.key",
-	"certificate authorization succeeds with correct client cert in DER format"
-);
+$common_connstr =
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR";
+
+SKIP:
+{
+	skip "NSS database not implemented in the Makefile", 1 if ($nss);
+	# correct client cert in unencrypted DER
+	test_connect_ok(
+		$common_connstr,
+		"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-der_tmp.key",
+		"certificate authorization succeeds with correct client cert in DER format"
+	);
+}
 
 # correct client cert in encrypted PEM
 test_connect_ok(
 	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='dUmmyP^#+'",
+	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='dUmmyP^#+' cert_database=ssl/nss/client.crt__client-encrypted-pem.key.db",
 	"certificate authorization succeeds with correct client cert in encrypted PEM format"
 );
 
-# correct client cert in encrypted DER
-test_connect_ok(
-	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-der_tmp.key sslpassword='dUmmyP^#+'",
-	"certificate authorization succeeds with correct client cert in encrypted DER format"
-);
+SKIP:
+{
+	skip "NSS database not implemented in the Makefile", 1 if ($nss);
+	# correct client cert in encrypted DER
+	test_connect_ok(
+		$common_connstr,
+		"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-der_tmp.key sslpassword='dUmmyP^#+'",
+		"certificate authorization succeeds with correct client cert in encrypted DER format"
+	);
+}
 
 # correct client cert in encrypted PEM with wrong password
 test_connect_fails(
 	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='wrong'",
-	qr!\Qprivate key file "ssl/client-encrypted-pem_tmp.key": bad decrypt\E!,
+	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='wrong' cert_database=ssl/nss/client.crt__client-encrypted-pem.key.db",
+	qr!connection requires a valid client certificate|\Qprivate key file "ssl/client-encrypted-pem_tmp.key": bad decrypt\E!,
 	"certificate authorization fails with correct client cert and wrong password in encrypted PEM format"
 );
 
@@ -471,18 +533,19 @@ command_like(
 		'-P',
 		'null=_null_',
 		'-d',
-		"$common_connstr user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client_tmp.key",
+		"$common_connstr user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client_tmp.key cert_database=ssl/nss/client.crt__client.key.db",
 		'-c',
 		"SELECT * FROM pg_stat_ssl WHERE pid = pg_backend_pid()"
 	],
 	qr{^pid,ssl,version,cipher,bits,compression,client_dn,client_serial,issuer_dn\r?\n
-				^\d+,t,TLSv[\d.]+,[\w-]+,\d+,f,/CN=ssltestuser,1,\Q/CN=Test CA for PostgreSQL SSL regression test client certs\E\r?$}mx,
+				^\d+,t,TLSv[\d.]+,[\w-]+,\d+,f,/?CN=ssltestuser,1,/?\QCN=Test CA for PostgreSQL SSL regression test client certs\E\r?$}mx,
 	'pg_stat_ssl with client certificate');
 
 # client key with wrong permissions
 SKIP:
 {
 	skip "Permissions check not enforced on Windows", 2 if ($windows_os);
+	skip "Key not on filesystem with NSS",            2 if ($nss);
 
 	test_connect_fails(
 		$common_connstr,
@@ -495,10 +558,13 @@ SKIP:
 test_connect_fails(
 	$common_connstr,
 	"user=anotheruser sslcert=ssl/client.crt sslkey=ssl/client_tmp.key",
-	qr/certificate authentication failed for user "anotheruser"/,
+	qr/unable to verify certificate|certificate authentication failed for user "anotheruser"/,
 	"certificate authorization fails with client cert belonging to another user"
 );
 
+$common_connstr =
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client-revoked.crt__client-revoked.key.db";
+
 # revoked client cert
 test_connect_fails(
 	$common_connstr,
@@ -510,7 +576,7 @@ test_connect_fails(
 # works, iff username matches Common Name
 # fails, iff username doesn't match Common Name.
 $common_connstr =
-  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=verifydb hostaddr=$SERVERHOSTADDR";
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=verifydb hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client.crt__client.key.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -536,17 +602,23 @@ test_connect_ok(
 # intermediate client_ca.crt is provided by client, and isn't in server's ssl_ca_file
 switch_server_cert($node, 'server-cn-only', 'root_ca');
 $common_connstr =
-  "user=ssltestuser dbname=certdb sslkey=ssl/client_tmp.key sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR";
+  "user=ssltestuser dbname=certdb sslkey=ssl/client_tmp.key sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client+client_ca.crt__client.key.db";
 
-test_connect_ok(
+TODO:
+{
+	local $TODO = "WIP failure cause currently unknown";
+	test_connect_ok(
+		$common_connstr,
+		"sslmode=require sslcert=ssl/client+client_ca.crt",
+		"intermediate client certificate is provided by client");
+}
+
+test_connect_fails(
 	$common_connstr,
-	"sslmode=require sslcert=ssl/client+client_ca.crt",
-	"intermediate client certificate is provided by client");
-test_connect_fails($common_connstr, "sslmode=require sslcert=ssl/client.crt",
-	qr/SSL error/, "intermediate client certificate is missing");
+	"sslmode=require sslcert=ssl/client.crt",
+	qr/connection requires a valid client certificate|SSL error/,
+	"intermediate client certificate is missing");
 
 # clean up
-foreach my $key (@keys)
-{
-	unlink("ssl/${key}_tmp.key");
-}
+
+SSL::Server::cleanup();
diff --git a/src/test/ssl/t/002_scram.pl b/src/test/ssl/t/002_scram.pl
index a088f71a1a..cf5714e544 100644
--- a/src/test/ssl/t/002_scram.pl
+++ b/src/test/ssl/t/002_scram.pl
@@ -11,24 +11,39 @@ use File::Copy;
 use FindBin;
 use lib $FindBin::RealBin;
 
-use SSLServer;
+use SSL::Server;
 
-if ($ENV{with_openssl} ne 'yes')
+my $openssl;
+my $nss;
+
+my $supports_tls_server_end_point;
+
+if ($ENV{with_ssl} eq 'no')
 {
 	plan skip_all => 'SSL not supported by this build';
 }
+else
+{
+	if ($ENV{with_ssl} eq 'openssl')
+	{
+		$openssl = 1;
+		# Determine whether build supports tls-server-end-point.
+		$supports_tls_server_end_point =
+			check_pg_config("#define HAVE_X509_GET_SIGNATURE_NID 1");
+		plan tests => $supports_tls_server_end_point ? 9 : 10;
+	}
+	elsif ($ENV{with_ssl} eq 'nss')
+	{
+		$nss = 1;
+		plan tests => 8;
+	}
+}
 
 # This is the hostname used to connect to the server.
 my $SERVERHOSTADDR = '127.0.0.1';
 # This is the pattern to use in pg_hba.conf to match incoming connections.
 my $SERVERHOSTCIDR = '127.0.0.1/32';
 
-# Determine whether build supports tls-server-end-point.
-my $supports_tls_server_end_point =
-  check_pg_config("#define HAVE_X509_GET_SIGNATURE_NID 1");
-
-my $number_of_tests = $supports_tls_server_end_point ? 9 : 10;
-
 # Allocation of base connection string shared among multiple tests.
 my $common_connstr;
 
@@ -66,20 +81,25 @@ test_connect_ok(
 	$common_connstr,
 	"user=ssltestuser channel_binding=disable",
 	"SCRAM with SSL and channel_binding=disable");
-if ($supports_tls_server_end_point)
-{
-	test_connect_ok(
-		$common_connstr,
-		"user=ssltestuser channel_binding=require",
-		"SCRAM with SSL and channel_binding=require");
-}
-else
+
+SKIP:
 {
-	test_connect_fails(
-		$common_connstr,
-		"user=ssltestuser channel_binding=require",
-		qr/channel binding is required, but server did not offer an authentication method that supports channel binding/,
-		"SCRAM with SSL and channel_binding=require");
+	skip "NSS support for TLS server endpoing is not implemented", 1 if ($nss);
+	if ($supports_tls_server_end_point)
+	{
+		test_connect_ok(
+			$common_connstr,
+			"user=ssltestuser channel_binding=require",
+			"SCRAM with SSL and channel_binding=require");
+	}
+	else
+	{
+		test_connect_fails(
+			$common_connstr,
+			"user=ssltestuser channel_binding=require",
+			qr/channel binding is required, but server did not offer an authentication method that supports channel binding/,
+			"SCRAM with SSL and channel_binding=require");
+	}
 }
 
 # Now test when the user has an MD5-encrypted password; should fail
@@ -89,20 +109,21 @@ test_connect_fails(
 	qr/channel binding required but not supported by server's authentication request/,
 	"MD5 with SSL and channel_binding=require");
 
-# Now test with auth method 'cert' by connecting to 'certdb'. Should fail,
-# because channel binding is not performed.  Note that ssl/client.key may
-# be used in a different test, so the name of this temporary client key
-# is chosen here to be unique.
-my $client_tmp_key = "ssl/client_scram_tmp.key";
-copy("ssl/client.key", $client_tmp_key);
-chmod 0600, $client_tmp_key;
-test_connect_fails(
-	"sslcert=ssl/client.crt sslkey=$client_tmp_key sslrootcert=invalid hostaddr=$SERVERHOSTADDR",
-	"dbname=certdb user=ssltestuser channel_binding=require",
-	qr/channel binding required, but server authenticated client without channel binding/,
-	"Cert authentication and channel_binding=require");
-
-# clean up
-unlink($client_tmp_key);
-
-done_testing($number_of_tests);
+SKIP:
+{
+	skip "NSS support not implemented yet", 1 if ($nss);
+	# Now test with auth method 'cert' by connecting to 'certdb'. Should fail,
+	# because channel binding is not performed.  Note that ssl/client.key may
+	# be used in a different test, so the name of this temporary client key
+	# is chosen here to be unique.
+	my $client_tmp_key = "ssl/client_scram_tmp.key";
+	copy("ssl/client.key", $client_tmp_key);
+	chmod 0600, $client_tmp_key;
+	test_connect_fails(
+		"sslcert=ssl/client.crt sslkey=$client_tmp_key sslrootcert=invalid hostaddr=$SERVERHOSTADDR",
+		"dbname=certdb user=ssltestuser channel_binding=require",
+		qr/channel binding required, but server authenticated client without channel binding/,
+		"Cert authentication and channel_binding=require");
+	# clean up
+	unlink($client_tmp_key);
+}
diff --git a/src/test/ssl/t/SSL/Backend/NSS.pm b/src/test/ssl/t/SSL/Backend/NSS.pm
new file mode 100644
index 0000000000..c5b31e584a
--- /dev/null
+++ b/src/test/ssl/t/SSL/Backend/NSS.pm
@@ -0,0 +1,73 @@
+package SSL::Backend::NSS;
+
+use strict;
+use warnings;
+use Exporter;
+
+our @ISA       = qw(Exporter);
+our @EXPORT_OK = qw(get_new_nss_backend);
+
+sub new
+{
+	my ($class) = @_;
+
+	my $self = { _library => 'NSS' };
+
+	bless $self, $class;
+
+	return $self;
+}
+
+sub get_new_nss_backend
+{
+	my $class = 'SSL::Backend::NSS';
+
+	return $class->new();
+}
+
+sub init
+{
+	# Make sure the certificate databases are in place?
+}
+
+sub get_library
+{
+	my ($self) = @_;
+
+	return $self->{_library};
+}
+
+sub set_server_cert
+{
+	my $self     = $_[0];
+	my $certfile = $_[1];
+	my $cafile   = $_[2];
+	my $keyfile  = $_[3];
+
+	my $cert_nickname;
+
+	if ($certfile =~ /native/)
+	{
+		$cert_nickname = $certfile;
+	}
+	else
+	{
+		$cert_nickname = $certfile . '.crt__' . $keyfile . '.key';
+	}
+	my $cert_database = $cert_nickname . '.db';
+
+	my $sslconf =
+	    "ssl_ca_file='$cafile.crt'\n"
+	  . "ssl_cert_file='ssl/$certfile.crt'\n"
+	  . "ssl_crl_file=''\n"
+	  . "ssl_database='nss/$cert_database'\n";
+
+	return $sslconf;
+}
+
+sub cleanup
+{
+	# Something?
+}
+
+1;
diff --git a/src/test/ssl/t/SSL/Backend/OpenSSL.pm b/src/test/ssl/t/SSL/Backend/OpenSSL.pm
new file mode 100644
index 0000000000..62b11b7632
--- /dev/null
+++ b/src/test/ssl/t/SSL/Backend/OpenSSL.pm
@@ -0,0 +1,103 @@
+package SSL::Backend::OpenSSL;
+
+use strict;
+use warnings;
+use Exporter;
+use File::Copy;
+
+our @ISA       = qw(Exporter);
+our @EXPORT_OK = qw(get_new_openssl_backend);
+
+our (@keys);
+
+INIT
+{
+	@keys = (
+		"client",     "client-revoked",
+		"client-der", "client-encrypted-pem",
+		"client-encrypted-der");
+}
+
+sub new
+{
+	my ($class) = @_;
+
+	my $self = { _library => 'OpenSSL' };
+
+	bless $self, $class;
+
+	return $self;
+}
+
+sub get_new_openssl_backend
+{
+	my $class = 'SSL::Backend::OpenSSL';
+
+	my $backend = $class->new();
+
+	return $backend;
+}
+
+sub init
+{
+	# The client's private key must not be world-readable, so take a copy
+	# of the key stored in the code tree and update its permissions.
+	#
+	# This changes ssl/client.key to ssl/client_tmp.key etc for the rest
+	# of the tests.
+	foreach my $key (@keys)
+	{
+		copy("ssl/${key}.key", "ssl/${key}_tmp.key")
+		  or die
+		  "couldn't copy ssl/${key}.key to ssl/${key}_tmp.key for permissions change: $!";
+		chmod 0600, "ssl/${key}_tmp.key"
+		  or die "failed to change permissions on ssl/${key}_tmp.key: $!";
+	}
+
+	# Also make a copy of that explicitly world-readable.  We can't
+	# necessarily rely on the file in the source tree having those
+	# permissions. Add it to @keys to include it in the final clean
+	# up phase.
+	copy("ssl/client.key", "ssl/client_wrongperms_tmp.key")
+	  or die
+	  "couldn't copy ssl/client.key to ssl/client_wrongperms_tmp.key: $!";
+	chmod 0644, "ssl/client_wrongperms_tmp.key"
+	  or die
+	  "failed to change permissions on ssl/client_wrongperms_tmp.key: $!";
+	push @keys, 'client_wrongperms';
+}
+
+# Change the configuration to use given server cert file, and reload
+# the server so that the configuration takes effect.
+sub set_server_cert
+{
+	my $self     = $_[0];
+	my $certfile = $_[1];
+	my $cafile   = $_[2] || "root+client_ca";
+	my $keyfile  = $_[3] || $certfile;
+
+	my $sslconf =
+	    "ssl_ca_file='$cafile.crt'\n"
+	  . "ssl_cert_file='$certfile.crt'\n"
+	  . "ssl_key_file='$keyfile.key'\n"
+	  . "ssl_crl_file='root+client.crl'\n";
+
+	return $sslconf;
+}
+
+sub get_library
+{
+	my ($self) = @_;
+
+	return $self->{_library};
+}
+
+sub cleanup
+{
+	foreach my $key (@keys)
+	{
+		unlink("ssl/${key}_tmp.key");
+	}
+}
+
+1;
diff --git a/src/test/ssl/t/SSLServer.pm b/src/test/ssl/t/SSL/Server.pm
similarity index 78%
rename from src/test/ssl/t/SSLServer.pm
rename to src/test/ssl/t/SSL/Server.pm
index f5987a003e..ee901855b5 100644
--- a/src/test/ssl/t/SSLServer.pm
+++ b/src/test/ssl/t/SSL/Server.pm
@@ -23,19 +23,39 @@
 # explicitly because an invalid sslcert or sslrootcert, respectively,
 # causes those to be ignored.)
 
-package SSLServer;
+package SSL::Server;
 
 use strict;
 use warnings;
 use PostgresNode;
+use RecursiveCopy;
 use TestLib;
 use File::Basename;
 use File::Copy;
 use Test::More;
+use SSL::Backend::OpenSSL qw(get_new_openssl_backend);
+use SSL::Backend::NSS qw(get_new_nss_backend);
+
+our ($openssl, $nss, $backend);
+
+# The TLS backend which the server is using should be mostly transparent for
+# the user, apart from individual configuration settings, so keep the backend
+# specific things abstracted behind SSL::Server.
+if ($ENV{with_ssl} eq 'openssl')
+{
+	$backend = get_new_openssl_backend();
+	$openssl = 1;
+}
+elsif ($ENV{with_ssl} eq 'nss')
+{
+	$backend = get_new_nss_backend();
+	$nss     = 1;
+}
 
 use Exporter 'import';
 our @EXPORT = qw(
   configure_test_server_for_ssl
+  set_server_cert
   switch_server_cert
   test_connect_fails
   test_connect_ok
@@ -144,12 +164,19 @@ sub configure_test_server_for_ssl
 	close $sslconf;
 
 	# Copy all server certificates and keys, and client root cert, to the data dir
-	copy_files("ssl/server-*.crt", $pgdata);
-	copy_files("ssl/server-*.key", $pgdata);
-	chmod(0600, glob "$pgdata/server-*.key") or die $!;
-	copy_files("ssl/root+client_ca.crt", $pgdata);
-	copy_files("ssl/root_ca.crt",        $pgdata);
-	copy_files("ssl/root+client.crl",    $pgdata);
+	if (defined($openssl))
+	{
+		copy_files("ssl/server-*.crt", $pgdata);
+		copy_files("ssl/server-*.key", $pgdata);
+		chmod(0600, glob "$pgdata/server-*.key") or die $!;
+		copy_files("ssl/root+client_ca.crt", $pgdata);
+		copy_files("ssl/root_ca.crt",        $pgdata);
+		copy_files("ssl/root+client.crl",    $pgdata);
+	}
+	elsif (defined($nss))
+	{
+		RecursiveCopy::copypath("ssl/nss", $pgdata . "/nss") if -e "ssl/nss";
+	}
 
 	# Stop and restart server to load new listen_addresses.
 	$node->restart;
@@ -157,26 +184,51 @@ sub configure_test_server_for_ssl
 	# Change pg_hba after restart because hostssl requires ssl=on
 	configure_hba_for_ssl($node, $servercidr, $authmethod);
 
+	# Finally, perform backend specific configuration
+	$backend->init();
+
 	return;
 }
 
-# Change the configuration to use given server cert file, and reload
-# the server so that the configuration takes effect.
-sub switch_server_cert
+sub ssl_library
+{
+	return $backend->get_library();
+}
+
+sub cleanup
+{
+	$backend->cleanup();
+}
+
+# Change the configuration to use given server cert file,
+sub set_server_cert
 {
 	my $node     = $_[0];
 	my $certfile = $_[1];
 	my $cafile   = $_[2] || "root+client_ca";
+	my $keyfile  = $_[3] || '';
+	my $pwcmd    = $_[4] || '';
 	my $pgdata   = $node->data_dir;
 
+	$keyfile = $certfile if $keyfile eq '';
+
 	open my $sslconf, '>', "$pgdata/sslconfig.conf";
 	print $sslconf "ssl=on\n";
-	print $sslconf "ssl_ca_file='$cafile.crt'\n";
-	print $sslconf "ssl_cert_file='$certfile.crt'\n";
-	print $sslconf "ssl_key_file='$certfile.key'\n";
-	print $sslconf "ssl_crl_file='root+client.crl'\n";
+	print $sslconf $backend->set_server_cert($certfile, $cafile, $keyfile);
+	print $sslconf "ssl_passphrase_command='$pwcmd'\n"
+	  unless $pwcmd eq '';
 	close $sslconf;
+	return;
+}
 
+# Change the configuration to use given server cert file, and reload
+# the server so that the configuration takes effect.
+# Takes the same arguments as set_server_cert, which it calls to do that
+# piece of the work.
+sub switch_server_cert
+{
+	my $node = $_[0];
+	set_server_cert(@_);
 	$node->restart;
 	return;
 }
-- 
2.21.1 (Apple Git-122.3)

From b266bc01d09ed8bb600c058a2d6a0e615f364c43 Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Wed, 28 Oct 2020 11:18:42 +0100
Subject: [PATCH v23 2/8] NSS Frontend, Backend and build infrastructure

TODO:
	* SCRAM channel binding is implemented but doesn't work
	* Frontend CRL configuration handling
	* Settle on a required version in autoconf
	* Move pg_nss.h to a .c file for both frontend and backend

Daniel Gustafsson, Andrew Dunstan, Jacob Champion
---
 configure                                     |  294 +++-
 configure.ac                                  |   31 +-
 .../postgres_fdw/expected/postgres_fdw.out    |    2 +-
 src/backend/libpq/Makefile                    |    4 +
 src/backend/libpq/auth.c                      |    7 +
 src/backend/libpq/be-secure-nss.c             | 1265 +++++++++++++++++
 src/backend/libpq/be-secure.c                 |    3 +
 src/backend/libpq/hba.c                       |    2 +-
 src/backend/utils/misc/guc.c                  |   20 +-
 src/common/Makefile                           |    5 +
 src/include/common/pg_nss.h                   |  175 +++
 src/include/libpq/libpq-be.h                  |   15 +-
 src/include/libpq/libpq.h                     |    3 +
 src/include/pg_config.h.in                    |    5 +-
 src/include/pg_config_manual.h                |    5 +-
 src/interfaces/libpq/Makefile                 |    5 +
 src/interfaces/libpq/fe-connect.c             |    4 +
 src/interfaces/libpq/fe-secure-nss.c          | 1112 +++++++++++++++
 src/interfaces/libpq/fe-secure.c              |    5 +-
 src/interfaces/libpq/libpq-fe.h               |   13 +-
 src/interfaces/libpq/libpq-int.h              |   20 +-
 src/tools/msvc/Mkvcbuild.pm                   |   22 +-
 src/tools/msvc/Solution.pm                    |   20 +
 src/tools/msvc/config_default.pl              |    1 +
 24 files changed, 3015 insertions(+), 23 deletions(-)
 create mode 100644 src/backend/libpq/be-secure-nss.c
 create mode 100644 src/include/common/pg_nss.h
 create mode 100644 src/interfaces/libpq/fe-secure-nss.c

diff --git a/configure b/configure
index ce9ea36999..143726c79c 100755
--- a/configure
+++ b/configure
@@ -654,6 +654,8 @@ UUID_LIBS
 LDAP_LIBS_BE
 LDAP_LIBS_FE
 with_ssl
+NSPR_CONFIG
+NSS_CONFIG
 PTHREAD_CFLAGS
 PTHREAD_LIBS
 PTHREAD_CC
@@ -1570,7 +1572,7 @@ Optional Packages:
                           use system time zone data in DIR
   --without-zlib          do not use Zlib
   --with-gnu-ld           assume the C compiler uses GNU ld [default=no]
-  --with-ssl=LIB          use LIB for SSL/TLS support (openssl)
+  --with-ssl=LIB          use LIB for SSL/TLS support (openssl, nss)
   --with-openssl          obsolete spelling of --with-ssl=openssl
 
 Some influential environment variables:
@@ -12462,8 +12464,274 @@ done
 
 $as_echo "#define USE_OPENSSL 1" >>confdefs.h
 
+elif test "$with_ssl" = nss ; then
+  # TODO: fallback in case nss-config/nspr-config aren't found.
+  if test -z "$NSS_CONFIG"; then
+  for ac_prog in nss-config
+do
+  # Extract the first word of "$ac_prog", so it can be a program name with args.
+set dummy $ac_prog; ac_word=$2
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
+$as_echo_n "checking for $ac_word... " >&6; }
+if ${ac_cv_path_NSS_CONFIG+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  case $NSS_CONFIG in
+  [\\/]* | ?:[\\/]*)
+  ac_cv_path_NSS_CONFIG="$NSS_CONFIG" # Let the user override the test with a path.
+  ;;
+  *)
+  as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH
+do
+  IFS=$as_save_IFS
+  test -z "$as_dir" && as_dir=.
+    for ac_exec_ext in '' $ac_executable_extensions; do
+  if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
+    ac_cv_path_NSS_CONFIG="$as_dir/$ac_word$ac_exec_ext"
+    $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
+    break 2
+  fi
+done
+  done
+IFS=$as_save_IFS
+
+  ;;
+esac
+fi
+NSS_CONFIG=$ac_cv_path_NSS_CONFIG
+if test -n "$NSS_CONFIG"; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $NSS_CONFIG" >&5
+$as_echo "$NSS_CONFIG" >&6; }
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+fi
+
+
+  test -n "$NSS_CONFIG" && break
+done
+
+else
+  # Report the value of NSS_CONFIG in configure's output in all cases.
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for NSS_CONFIG" >&5
+$as_echo_n "checking for NSS_CONFIG... " >&6; }
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $NSS_CONFIG" >&5
+$as_echo "$NSS_CONFIG" >&6; }
+fi
+
+  if test -z "$NSPR_CONFIG"; then
+  for ac_prog in nspr-config
+do
+  # Extract the first word of "$ac_prog", so it can be a program name with args.
+set dummy $ac_prog; ac_word=$2
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
+$as_echo_n "checking for $ac_word... " >&6; }
+if ${ac_cv_path_NSPR_CONFIG+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  case $NSPR_CONFIG in
+  [\\/]* | ?:[\\/]*)
+  ac_cv_path_NSPR_CONFIG="$NSPR_CONFIG" # Let the user override the test with a path.
+  ;;
+  *)
+  as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH
+do
+  IFS=$as_save_IFS
+  test -z "$as_dir" && as_dir=.
+    for ac_exec_ext in '' $ac_executable_extensions; do
+  if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
+    ac_cv_path_NSPR_CONFIG="$as_dir/$ac_word$ac_exec_ext"
+    $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
+    break 2
+  fi
+done
+  done
+IFS=$as_save_IFS
+
+  ;;
+esac
+fi
+NSPR_CONFIG=$ac_cv_path_NSPR_CONFIG
+if test -n "$NSPR_CONFIG"; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $NSPR_CONFIG" >&5
+$as_echo "$NSPR_CONFIG" >&6; }
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+fi
+
+
+  test -n "$NSPR_CONFIG" && break
+done
+
+else
+  # Report the value of NSPR_CONFIG in configure's output in all cases.
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for NSPR_CONFIG" >&5
+$as_echo_n "checking for NSPR_CONFIG... " >&6; }
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $NSPR_CONFIG" >&5
+$as_echo "$NSPR_CONFIG" >&6; }
+fi
+
+  if test -n "$NSS_CONFIG"; then
+    NSS_LIBS=`$NSS_CONFIG --libs`
+	NSS_CFLAGS=`$NSS_CONFIG --cflags`
+  fi
+  if test -n "$NSPR_CONFIG"; then
+	NSPR_LIBS=`$NSPR_CONFIG --libs`
+	NSPR_CFLAGS=`$NSPR_CONFIG --cflags`
+  fi
+
+  LDFLAGS="$LDFLAGS $NSS_LIBS $NSPR_LIBS"
+  CFLAGS="$CFLAGS $NSS_CFLAGS $NSPR_CFLAGS"
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for NSS_InitContext in -lnss3" >&5
+$as_echo_n "checking for NSS_InitContext in -lnss3... " >&6; }
+if ${ac_cv_lib_nss3_NSS_InitContext+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lnss3  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char NSS_InitContext ();
+int
+main ()
+{
+return NSS_InitContext ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_lib_nss3_NSS_InitContext=yes
+else
+  ac_cv_lib_nss3_NSS_InitContext=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_nss3_NSS_InitContext" >&5
+$as_echo "$ac_cv_lib_nss3_NSS_InitContext" >&6; }
+if test "x$ac_cv_lib_nss3_NSS_InitContext" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_LIBNSS3 1
+_ACEOF
+
+  LIBS="-lnss3 $LIBS"
+
+else
+  as_fn_error $? "library 'nss3' is required for NSS" "$LINENO" 5
+fi
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for PR_GetDefaultIOMethods in -lnspr4" >&5
+$as_echo_n "checking for PR_GetDefaultIOMethods in -lnspr4... " >&6; }
+if ${ac_cv_lib_nspr4_PR_GetDefaultIOMethods+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lnspr4  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char PR_GetDefaultIOMethods ();
+int
+main ()
+{
+return PR_GetDefaultIOMethods ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_lib_nspr4_PR_GetDefaultIOMethods=yes
+else
+  ac_cv_lib_nspr4_PR_GetDefaultIOMethods=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_nspr4_PR_GetDefaultIOMethods" >&5
+$as_echo "$ac_cv_lib_nspr4_PR_GetDefaultIOMethods" >&6; }
+if test "x$ac_cv_lib_nspr4_PR_GetDefaultIOMethods" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_LIBNSPR4 1
+_ACEOF
+
+  LIBS="-lnspr4 $LIBS"
+
+else
+  as_fn_error $? "library 'nspr4' is required for NSS" "$LINENO" 5
+fi
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for SSL_GetImplementedCiphers in -lssl3" >&5
+$as_echo_n "checking for SSL_GetImplementedCiphers in -lssl3... " >&6; }
+if ${ac_cv_lib_ssl3_SSL_GetImplementedCiphers+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lssl3  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char SSL_GetImplementedCiphers ();
+int
+main ()
+{
+return SSL_GetImplementedCiphers ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_lib_ssl3_SSL_GetImplementedCiphers=yes
+else
+  ac_cv_lib_ssl3_SSL_GetImplementedCiphers=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_ssl3_SSL_GetImplementedCiphers" >&5
+$as_echo "$ac_cv_lib_ssl3_SSL_GetImplementedCiphers" >&6; }
+if test "x$ac_cv_lib_ssl3_SSL_GetImplementedCiphers" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_LIBSSL3 1
+_ACEOF
+
+  LIBS="-lssl3 $LIBS"
+
+else
+  as_fn_error $? "library 'ssl3' is required for NSS" "$LINENO" 5
+fi
+
+
+$as_echo "#define USE_NSS 1" >>confdefs.h
+
 elif test "$with_ssl" != no ; then
-  as_fn_error $? "--with-ssl must specify openssl" "$LINENO" 5
+  as_fn_error $? "--with-ssl must specify one of openssl or nss" "$LINENO" 5
 fi
 
 
@@ -13369,6 +13637,23 @@ else
 fi
 
 
+elif test "$with_ssl" = nss ; then
+  ac_fn_c_check_header_mongrel "$LINENO" "nss/ssl.h" "ac_cv_header_nss_ssl_h" "$ac_includes_default"
+if test "x$ac_cv_header_nss_ssl_h" = xyes; then :
+
+else
+  as_fn_error $? "header file <nss/ssl.h> is required for NSS" "$LINENO" 5
+fi
+
+
+  ac_fn_c_check_header_mongrel "$LINENO" "nss/nss.h" "ac_cv_header_nss_nss_h" "$ac_includes_default"
+if test "x$ac_cv_header_nss_nss_h" = xyes; then :
+
+else
+  as_fn_error $? "header file <nss/nss.h> is required for NSS" "$LINENO" 5
+fi
+
+
 fi
 
 if test "$with_pam" = yes ; then
@@ -18131,6 +18416,9 @@ $as_echo_n "checking which random number source to use... " >&6; }
 if test x"$with_ssl" = x"openssl" ; then
   { $as_echo "$as_me:${as_lineno-$LINENO}: result: OpenSSL" >&5
 $as_echo "OpenSSL" >&6; }
+elif test x"$with_ssl" = x"nss" ; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: NSS" >&5
+$as_echo "NSS" >&6; }
 elif test x"$PORTNAME" = x"win32" ; then
   { $as_echo "$as_me:${as_lineno-$LINENO}: result: Windows native" >&5
 $as_echo "Windows native" >&6; }
@@ -18160,7 +18448,7 @@ fi
   if test x"$ac_cv_file__dev_urandom" = x"no" ; then
     as_fn_error $? "
 no source of strong random numbers was found
-PostgreSQL can use OpenSSL, native Windows API or /dev/urandom as a source of random numbers." "$LINENO" 5
+PostgreSQL can use OpenSSL, NSS, native Windows API or /dev/urandom as a source of random numbers." "$LINENO" 5
   fi
 fi
 
diff --git a/configure.ac b/configure.ac
index 07da84d401..59657a6010 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1201,7 +1201,7 @@ fi
 #
 # There is currently only one supported SSL/TLS library: OpenSSL.
 #
-PGAC_ARG_REQ(with, ssl, [LIB], [use LIB for SSL/TLS support (openssl)])
+PGAC_ARG_REQ(with, ssl, [LIB], [use LIB for SSL/TLS support (openssl, nss)])
 if test x"$with_ssl" = x"" ; then
   with_ssl=no
 fi
@@ -1235,8 +1235,28 @@ if test "$with_ssl" = openssl ; then
   # function was removed.
   AC_CHECK_FUNCS([CRYPTO_lock])
   AC_DEFINE([USE_OPENSSL], 1, [Define to 1 if you have OpenSSL support.])
+elif test "$with_ssl" = nss ; then
+  # TODO: fallback in case nss-config/nspr-config aren't found.
+  PGAC_PATH_PROGS(NSS_CONFIG, nss-config)
+  PGAC_PATH_PROGS(NSPR_CONFIG, nspr-config)
+  if test -n "$NSS_CONFIG"; then
+    NSS_LIBS=`$NSS_CONFIG --libs`
+	NSS_CFLAGS=`$NSS_CONFIG --cflags`
+  fi
+  if test -n "$NSPR_CONFIG"; then
+	NSPR_LIBS=`$NSPR_CONFIG --libs`
+	NSPR_CFLAGS=`$NSPR_CONFIG --cflags`
+  fi
+
+  LDFLAGS="$LDFLAGS $NSS_LIBS $NSPR_LIBS"
+  CFLAGS="$CFLAGS $NSS_CFLAGS $NSPR_CFLAGS"
+
+  AC_CHECK_LIB(nss3, NSS_InitContext, [], [AC_MSG_ERROR([library 'nss3' is required for NSS])])
+  AC_CHECK_LIB(nspr4, PR_GetDefaultIOMethods, [], [AC_MSG_ERROR([library 'nspr4' is required for NSS])])
+  AC_CHECK_LIB(ssl3, SSL_GetImplementedCiphers, [], [AC_MSG_ERROR([library 'ssl3' is required for NSS])])
+  AC_DEFINE([USE_NSS], 1, [Define to 1 if you have NSS support,])
 elif test "$with_ssl" != no ; then
-  AC_MSG_ERROR([--with-ssl must specify openssl])
+  AC_MSG_ERROR([--with-ssl must specify one of openssl or nss])
 fi
 AC_SUBST(with_ssl)
 
@@ -1414,6 +1434,9 @@ fi
 if test "$with_ssl" = openssl ; then
   AC_CHECK_HEADER(openssl/ssl.h, [], [AC_MSG_ERROR([header file <openssl/ssl.h> is required for OpenSSL])])
   AC_CHECK_HEADER(openssl/err.h, [], [AC_MSG_ERROR([header file <openssl/err.h> is required for OpenSSL])])
+elif test "$with_ssl" = nss ; then
+  AC_CHECK_HEADER(nss/ssl.h, [], [AC_MSG_ERROR([header file <nss/ssl.h> is required for NSS])])
+  AC_CHECK_HEADER(nss/nss.h, [], [AC_MSG_ERROR([header file <nss/nss.h> is required for NSS])])
 fi
 
 if test "$with_pam" = yes ; then
@@ -2170,6 +2193,8 @@ fi
 AC_MSG_CHECKING([which random number source to use])
 if test x"$with_ssl" = x"openssl" ; then
   AC_MSG_RESULT([OpenSSL])
+elif test x"$with_ssl" = x"nss" ; then
+  AC_MSG_RESULT([NSS])
 elif test x"$PORTNAME" = x"win32" ; then
   AC_MSG_RESULT([Windows native])
 else
@@ -2179,7 +2204,7 @@ else
   if test x"$ac_cv_file__dev_urandom" = x"no" ; then
     AC_MSG_ERROR([
 no source of strong random numbers was found
-PostgreSQL can use OpenSSL, native Windows API or /dev/urandom as a source of random numbers.])
+PostgreSQL can use OpenSSL, NSS, native Windows API or /dev/urandom as a source of random numbers.])
   fi
 fi
 
diff --git a/contrib/postgres_fdw/expected/postgres_fdw.out b/contrib/postgres_fdw/expected/postgres_fdw.out
index 07e06e5bf7..751ce081d7 100644
--- a/contrib/postgres_fdw/expected/postgres_fdw.out
+++ b/contrib/postgres_fdw/expected/postgres_fdw.out
@@ -8939,7 +8939,7 @@ DO $d$
     END;
 $d$;
 ERROR:  invalid option "password"
-HINT:  Valid options in this context are: service, passfile, channel_binding, connect_timeout, dbname, host, hostaddr, port, options, application_name, keepalives, keepalives_idle, keepalives_interval, keepalives_count, tcp_user_timeout, sslmode, sslcompression, sslcert, sslkey, sslrootcert, sslcrl, requirepeer, ssl_min_protocol_version, ssl_max_protocol_version, gssencmode, krbsrvname, gsslib, target_session_attrs, use_remote_estimate, fdw_startup_cost, fdw_tuple_cost, extensions, updatable, fetch_size, batch_size
+HINT:  Valid options in this context are: service, passfile, channel_binding, connect_timeout, dbname, host, hostaddr, port, options, application_name, keepalives, keepalives_idle, keepalives_interval, keepalives_count, tcp_user_timeout, sslmode, sslcompression, sslcert, sslkey, sslrootcert, sslcrl, requirepeer, ssl_min_protocol_version, ssl_max_protocol_version, gssencmode, krbsrvname, gsslib, target_session_attrs, cert_database, use_remote_estimate, fdw_startup_cost, fdw_tuple_cost, extensions, updatable, fetch_size, batch_size
 CONTEXT:  SQL statement "ALTER SERVER loopback_nopw OPTIONS (ADD password 'dummypw')"
 PL/pgSQL function inline_code_block line 3 at EXECUTE
 -- If we add a password for our user mapping instead, we should get a different
diff --git a/src/backend/libpq/Makefile b/src/backend/libpq/Makefile
index 8d1d16b0fc..045d2c2f6b 100644
--- a/src/backend/libpq/Makefile
+++ b/src/backend/libpq/Makefile
@@ -30,6 +30,10 @@ OBJS = \
 
 ifeq ($(with_ssl),openssl)
 OBJS += be-secure-openssl.o
+else
+ifeq ($(with_ssl),nss)
+OBJS += be-secure-nss.o
+endif
 endif
 
 ifeq ($(with_gssapi),yes)
diff --git a/src/backend/libpq/auth.c b/src/backend/libpq/auth.c
index 545635f41a..09ad2ad063 100644
--- a/src/backend/libpq/auth.c
+++ b/src/backend/libpq/auth.c
@@ -2849,7 +2849,14 @@ CheckCertAuth(Port *port)
 {
 	int			status_check_usermap = STATUS_ERROR;
 
+#if defined(USE_OPENSSL)
 	Assert(port->ssl);
+#elif defined(USE_NSS)
+	/* TODO: should we rename pr_fd to ssl, to keep consistency? */
+	Assert(port->pr_fd);
+#else
+	Assert(false);
+#endif
 
 	/* Make sure we have received a username in the certificate */
 	if (port->peer_cn == NULL ||
diff --git a/src/backend/libpq/be-secure-nss.c b/src/backend/libpq/be-secure-nss.c
new file mode 100644
index 0000000000..111b46dea8
--- /dev/null
+++ b/src/backend/libpq/be-secure-nss.c
@@ -0,0 +1,1265 @@
+/*-------------------------------------------------------------------------
+ *
+ * be-secure-nss.c
+ *	  functions for supporting NSS as a TLS backend
+ *
+ *
+ * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ *	  src/backend/libpq/be-secure-nss.c
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#include "postgres.h"
+
+#include <sys/stat.h>
+
+/*
+ * BITS_PER_BYTE is also defined in the NSPR header files, so we need to undef
+ * our version to avoid compiler warnings on redefinition.
+ */
+#define pg_BITS_PER_BYTE BITS_PER_BYTE
+#undef BITS_PER_BYTE
+
+/*
+ * The nspr/obsolete/protypes.h NSPR header typedefs uint64 and int64 with
+ * colliding definitions from ours, causing a much expected compiler error.
+ * Remove backwards compatibility with ancient NSPR versions to avoid this.
+ */
+#define NO_NSPR_10_SUPPORT
+#include <nspr/nspr.h>
+#include <nspr/prerror.h>
+#include <nspr/prio.h>
+#include <nspr/prmem.h>
+#include <nspr/prtypes.h>
+
+#include <nss/nss.h>
+#include <nss/base64.h>
+#include <nss/cert.h>
+#include <nss/certdb.h>
+#include <nss/hasht.h>
+#include <nss/keyhi.h>
+#include <nss/pk11pub.h>
+#include <nss/secder.h>
+#include <nss/secerr.h>
+#include <nss/secitem.h>
+#include <nss/secoidt.h>
+#include <nss/secport.h>
+#include <nss/ssl.h>
+#include <nss/sslerr.h>
+#include <nss/sslproto.h>
+
+/*
+ * Ensure that the colliding definitions match, else throw an error. In case
+ * NSPR has removed the definition for some reason, make sure to put ours
+ * back again.
+ */
+#if defined(BITS_PER_BYTE)
+#if BITS_PER_BYTE != pg_BITS_PER_BYTE
+#error "incompatible byte widths between NSPR and postgres"
+#endif
+#else
+#define BITS_PER_BYTE pg_BITS_PER_BYTE
+#endif
+#undef pg_BITS_PER_BYTE
+
+#include "common/pg_nss.h"
+#include "lib/stringinfo.h"
+#include "libpq/libpq.h"
+#include "nodes/pg_list.h"
+#include "miscadmin.h"
+#include "storage/fd.h"
+#include "utils/guc.h"
+#include "utils/memutils.h"
+
+
+/* default init hook can be overridden by a shared library */
+static void default_nss_tls_init(bool isServerStart);
+nss_tls_init_hook_type nss_tls_init_hook = default_nss_tls_init;
+
+static PRDescIdentity pr_id;
+
+static PRIOMethods pr_iomethods;
+static NSSInitContext * nss_context = NULL;
+static SSLVersionRange desired_sslver;
+
+static char *external_ssl_passphrase_cb(PK11SlotInfo *slot, PRBool retry, void *arg);
+static bool dummy_ssl_passwd_cb_called = false;
+static bool ssl_is_server_start;
+
+/*
+ * PR_ImportTCPSocket() is a private API, but very widely used, as it's the
+ * only way to make NSS use an already set up POSIX file descriptor rather
+ * than opening one itself. To quote the NSS documentation:
+ *
+ *		"In theory, code that uses PR_ImportTCPSocket may break when NSPR's
+ *		implementation changes. In practice, this is unlikely to happen because
+ *		NSPR's implementation has been stable for years and because of NSPR's
+ *		strong commitment to backward compatibility."
+ *
+ * https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSPR/Reference/PR_ImportTCPSocket
+ *
+ * The function is declared in <private/pprio.h>, but as it is a header marked
+ * private we declare it here rather than including it.
+ */
+NSPR_API(PRFileDesc *) PR_ImportTCPSocket(int);
+
+/* NSS IO layer callback overrides */
+static PRInt32 pg_ssl_read(PRFileDesc * fd, void *buf, PRInt32 amount,
+						   PRIntn flags, PRIntervalTime timeout);
+static PRInt32 pg_ssl_write(PRFileDesc * fd, const void *buf, PRInt32 amount,
+							PRIntn flags, PRIntervalTime timeout);
+static PRStatus pg_ssl_close(PRFileDesc * fd);
+/* Utility functions */
+static PRFileDesc * init_iolayer(Port *port);
+static uint16 ssl_protocol_version_to_nss(int v, const char *guc_name);
+
+static char *pg_SSLerrmessage(PRErrorCode errcode);
+static char *ssl_protocol_version_to_string(int v);
+static SECStatus pg_cert_auth_handler(void *arg, PRFileDesc * fd,
+									  PRBool checksig, PRBool isServer);
+static SECStatus pg_bad_cert_handler(void *arg, PRFileDesc * fd);
+static char *dummy_ssl_passphrase_cb(PK11SlotInfo * slot, PRBool retry, void *arg);
+
+/* ------------------------------------------------------------ */
+/*						 Public interface						*/
+/* ------------------------------------------------------------ */
+
+/*
+ * be_tls_init
+ *			Initialize the nss TLS library in the postmaster
+ *
+ * The majority of the setup needs to happen in be_tls_open_server since the
+ * NSPR initialization must happen after the forking of the backend. We could
+ * potentially move some parts in under !isServerStart, but so far this is the
+ * separation chosen.
+ */
+int
+be_tls_init(bool isServerStart)
+{
+	SECStatus	status;
+	SSLVersionRange supported_sslver;
+
+	status = SSL_ConfigServerSessionIDCacheWithOpt(0, 0, NULL, 1, 0, 0, PR_FALSE);
+	if (status != SECSuccess)
+	{
+		ereport(isServerStart ? FATAL : LOG,
+				(errmsg("unable to connect to TLS connection cache: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+		return -1;
+	}
+
+	if (!ssl_database || strlen(ssl_database) == 0)
+	{
+		ereport(isServerStart ? FATAL : LOG,
+				(errmsg("no certificate database specified")));
+		return -1;
+	}
+
+	/*
+	 * We check for the desired TLS version range here, even though we cannot
+	 * set it until be_open_server such that we can be compatible with how the
+	 * OpenSSL backend reports errors for incompatible range configurations.
+	 * Set either the default supported TLS version range, or the configured
+	 * range from ssl_min_protocol_version and ssl_max_protocol version. In
+	 * case the user hasn't defined the maximum allowed version we fall back
+	 * to the highest version TLS that the library supports.
+	 */
+	if (SSL_VersionRangeGetSupported(ssl_variant_stream, &supported_sslver) != SECSuccess)
+	{
+		ereport(isServerStart ? FATAL : LOG,
+				(errmsg("unable to get default protocol support from NSS")));
+		return -1;
+	}
+
+	/*
+	 * Set the fallback versions for the TLS protocol version range to a
+	 * combination of our minimal requirement and the library maximum. Error
+	 * messages should be kept identical to those in be-secure-openssl.c to
+	 * make translations easier.
+	 */
+	desired_sslver.min = SSL_LIBRARY_VERSION_TLS_1_0;
+	desired_sslver.max = supported_sslver.max;
+
+	if (ssl_min_protocol_version)
+	{
+		int			ver = ssl_protocol_version_to_nss(ssl_min_protocol_version,
+													  "ssl_min_protocol_version");
+
+		if (ver == -1)
+		{
+			ereport(isServerStart ? FATAL : LOG,
+					(errmsg("\"%s\" setting \"%s\" not supported by this build",
+							"ssl_min_protocol_version",
+							GetConfigOption("ssl_min_protocol_version",
+											false, false))));
+			return -1;
+		}
+
+		if (ver > 0)
+			desired_sslver.min = ver;
+	}
+
+	if (ssl_max_protocol_version)
+	{
+		int			ver = ssl_protocol_version_to_nss(ssl_max_protocol_version,
+													  "ssl_max_protocol_version");
+
+		if (ver == -1)
+		{
+			ereport(isServerStart ? FATAL : LOG,
+					(errmsg("\"%s\" setting \"%s\" not supported by this build",
+							"ssl_max_protocol_version",
+							GetConfigOption("ssl_max_protocol_version",
+											false, false))));
+			return -1;
+		}
+		if (ver > 0)
+			desired_sslver.max = ver;
+
+		if (ver < desired_sslver.min)
+		{
+			ereport(isServerStart ? FATAL : LOG,
+					(errmsg("could not set SSL protocol version range"),
+					 errdetail("\"%s\" cannot be higher than \"%s\"",
+							   "ssl_min_protocol_version",
+							   "ssl_max_protocol_version")));
+			return -1;
+		}
+	}
+
+	/*
+	 * Set the passphrase callback which will be used both to obtain the
+	 * passphrase from the user, as well as by NSS to obtain the phrase
+	 * repeatedly.
+	 */
+	ssl_is_server_start = isServerStart;
+	(*nss_tls_init_hook) (isServerStart);
+
+	return 0;
+}
+
+int
+be_tls_open_server(Port *port)
+{
+	SECStatus	status;
+	PRFileDesc *model;
+	PRFileDesc *pr_fd;
+	PRFileDesc *layer;
+	CERTCertificate *server_cert;
+	SECKEYPrivateKey *private_key;
+	CERTSignedCrl *crl;
+	SECItem		crlname;
+	char	   *cert_database;
+	NSSInitParameters params;
+
+	/*
+	 * The NSPR documentation states that runtime initialization via PR_Init
+	 * is no longer required, as the first caller into NSPR will perform the
+	 * initialization implicitly. The documentation doesn't however clarify
+	 * from which version this is holds true, so let's perform the potentially
+	 * superfluous initialization anyways to avoid crashing on older versions
+	 * of NSPR, as there is no difference in overhead.  The NSS documentation
+	 * still states that PR_Init must be called in some way (implicitly or
+	 * explicitly).
+	 *
+	 * The below parameters are what the implicit initialization would've done
+	 * for us, and should work even for older versions where it might not be
+	 * done automatically. The last parameter, maxPTDs, is set to various
+	 * values in other codebases, but has been unused since NSPR 2.1 which was
+	 * released sometime in 1998. In current versions of NSPR all parameters
+	 * are ignored.
+	 */
+	PR_Init(PR_USER_THREAD, PR_PRIORITY_NORMAL, 0 /* maxPTDs */ );
+
+	/*
+	 * The certificate path (configdir) must contain a valid NSS database. If
+	 * the certificate path isn't a valid directory, NSS will fall back on the
+	 * system certificate database. If the certificate path is a directory but
+	 * is empty then the initialization will fail. On the client side this can
+	 * be allowed for any sslmode but the verify-xxx ones.
+	 * https://bugzilla.redhat.com/show_bug.cgi?id=728562 For the server side
+	 * we won't allow this to fail however, as we require the certificate and
+	 * key to exist.
+	 *
+	 * The original design of NSS was for a single application to use a single
+	 * copy of it, initialized with NSS_Initialize() which isn't returning any
+	 * handle with which to refer to NSS. NSS initialization and shutdown are
+	 * global for the application, so a shutdown in another NSS enabled
+	 * library would cause NSS to be stopped for libpq as well.  The fix has
+	 * been to introduce NSS_InitContext which returns a context handle to
+	 * pass to NSS_ShutdownContext.  NSS_InitContext was introduced in NSS
+	 * 3.12, but the use of it is not very well documented.
+	 * https://bugzilla.redhat.com/show_bug.cgi?id=738456
+	 *
+	 * The InitParameters struct passed can be used to override internal
+	 * values in NSS, but the usage is not documented at all. When using
+	 * NSS_Init initializations, the values are instead set via PK11_Configure
+	 * calls so the PK11_Configure documentation can be used to glean some
+	 * details on these.
+	 *
+	 * https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS/PKCS11/Module_Specs
+	 */
+	memset(&params, '\0', sizeof(params));
+	params.length = sizeof(params);
+
+	if (!ssl_database || strlen(ssl_database) == 0)
+		ereport(FATAL,
+				(errmsg("no certificate database specified")));
+
+	cert_database = psprintf("sql:%s", ssl_database);
+	nss_context = NSS_InitContext(cert_database, "", "", "",
+								  &params,
+								  NSS_INIT_READONLY | NSS_INIT_PK11RELOAD);
+	pfree(cert_database);
+
+	if (!nss_context)
+		ereport(FATAL,
+				(errmsg("unable to read certificate database \"%s\": %s",
+						ssl_database, pg_SSLerrmessage(PR_GetError()))));
+
+	/*
+	 * Import the already opened socket as we don't want to use NSPR functions
+	 * for opening the network socket due to how the PostgreSQL protocol works
+	 * with TLS connections. This function is not part of the NSPR public API,
+	 * see the comment at the top of the file for the rationale of still using
+	 * it.
+	 */
+	pr_fd = PR_ImportTCPSocket(port->sock);
+	if (!pr_fd)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to connect to socket")));
+		return -1;
+	}
+
+	/*
+	 * Most of the documentation available, and implementations of, NSS/NSPR
+	 * use the PR_NewTCPSocket() function here, which has the drawback that it
+	 * can only create IPv4 sockets. Instead use PR_OpenTCPSocket() which
+	 * copes with IPv6 as well.
+	 *
+	 * We use a model filedescriptor here which is a construct in NSPR/NSS in
+	 * order to create a configuration template for sockets which can then be
+	 * applied to new sockets created. This makes more sense in a server which
+	 * accepts multiple connections and want to perform the boilerplate just
+	 * once, but it does provide a nice abstraction here as well in that we
+	 * can error out early without having performed any operation on the real
+	 * socket.
+	 */
+	model = PR_OpenTCPSocket(port->laddr.addr.ss_family);
+	if (!model)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to open socket")));
+		return -1;
+	}
+
+	/*
+	 * Convert the NSPR socket to an SSL socket. Ensuring the success of this
+	 * operation is critical as NSS SSL_* functions may return SECSuccess on
+	 * the socket even though SSL hasn't been enabled, which introduce a risk
+	 * of silent downgrades.
+	 */
+	model = SSL_ImportFD(NULL, model);
+	if (!model)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to enable TLS on socket")));
+		return -1;
+	}
+
+	/*
+	 * Configure basic settings for the connection over the SSL socket in
+	 * order to set it up as a server.
+	 */
+	if (SSL_OptionSet(model, SSL_SECURITY, PR_TRUE) != SECSuccess)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to configure TLS connection")));
+		return -1;
+	}
+
+	if (SSL_OptionSet(model, SSL_HANDSHAKE_AS_SERVER, PR_TRUE) != SECSuccess ||
+		SSL_OptionSet(model, SSL_HANDSHAKE_AS_CLIENT, PR_FALSE) != SECSuccess)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to configure TLS connection as server")));
+		return -1;
+	}
+
+	/*
+	 * SSLv2 is disabled by default, and SSLv3 will be excluded from the range
+	 * of allowed protocols further down. Since we really don't want these to
+	 * ever be enabled, let's use belts and suspenders and explicitly turn
+	 * them off as well.
+	 */
+	SSL_OptionSet(model, SSL_ENABLE_SSL2, PR_FALSE);
+	SSL_OptionSet(model, SSL_ENABLE_SSL3, PR_FALSE);
+
+#ifdef SSL_CBC_RANDOM_IV
+
+	/*
+	 * Enable protection against the BEAST attack in case the NSS server has
+	 * support for that. While SSLv3 is disabled, we may still allow TLSv1
+	 * which is affected. The option isn't documented as an SSL option, but as
+	 * an NSS environment variable.
+	 */
+	SSL_OptionSet(model, SSL_CBC_RANDOM_IV, PR_TRUE);
+#endif
+
+	/*
+	 * Configure the allowed ciphers. If there are no user preferred suites,
+	 * set the domestic policy.
+	 *
+	 * Historically there were different cipher policies based on export (and
+	 * import) restrictions: Domestic, Export and France. These are since long
+	 * removed with all ciphers being enabled by default. Due to backwards
+	 * compatibility, the old API is still used even though all three policies
+	 * now do the same thing.
+	 *
+	 * If SSLCipherSuites define a policy of the user, we set that rather than
+	 * enabling all ciphers via NSS_SetDomesticPolicy.
+	 *
+	 * TODO: while this code works, the set of ciphers which can be set and
+	 * still end up with a working socket is woefully underdocumented for
+	 * anything more recent than SSLv3 (the code for TLS actually calls ssl3
+	 * functions under the hood for SSL_CipherPrefSet), so it's unclear if
+	 * this is helpful or not. Using the policies works, but may be too
+	 * coarsely grained.
+	 *
+	 * Another TODO: The SSL_ImplementedCiphers table returned with calling
+	 * SSL_GetImplementedCiphers is sorted in server preference order. Sorting
+	 * SSLCipherSuites according to the order of the ciphers therein could be
+	 * a way to implement ssl_prefer_server_ciphers - if we at all want to use
+	 * cipher selection for NSS like how we do it for OpenSSL that is.
+	 */
+
+	/*
+	 * If no ciphers are specified, enable them all.
+	 */
+	if (!SSLCipherSuites || strlen(SSLCipherSuites) == 0)
+	{
+		status = NSS_SetDomesticPolicy();
+		if (status != SECSuccess)
+		{
+			ereport(COMMERROR,
+					(errmsg("unable to set cipher policy: %s",
+							pg_SSLerrmessage(PR_GetError()))));
+			return -1;
+		}
+	}
+	else
+	{
+		char	   *ciphers,
+				   *c;
+
+		char	   *sep = ":;, ";
+		PRUint16	ciphercode;
+		const		PRUint16 *nss_ciphers;
+
+		/*
+		 * If the user has specified a set of preferred cipher suites we start
+		 * by turning off all the existing suites to avoid the risk of down-
+		 * grades to a weaker cipher than expected.
+		 */
+		nss_ciphers = SSL_GetImplementedCiphers();
+		for (int i = 0; i < SSL_GetNumImplementedCiphers(); i++)
+			SSL_CipherPrefSet(model, nss_ciphers[i], PR_FALSE);
+
+		ciphers = pstrdup(SSLCipherSuites);
+
+		for (c = strtok(ciphers, sep); c; c = strtok(NULL, sep))
+		{
+			ciphercode = pg_find_cipher(c);
+			if (ciphercode != INVALID_CIPHER)
+			{
+				status = SSL_CipherPrefSet(model, ciphercode, PR_TRUE);
+				if (status != SECSuccess)
+				{
+					ereport(COMMERROR,
+							(errmsg("invalid cipher-suite specified: %s", c)));
+					return -1;
+				}
+			}
+		}
+
+		pfree(ciphers);
+	}
+
+	if (SSL_VersionRangeSet(model, &desired_sslver) != SECSuccess)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to set requested SSL protocol version range")));
+		return -1;
+	}
+
+	/*
+	 * Set up the custom IO layer.
+	 */
+	layer = init_iolayer(port);
+	if (!layer)
+		return -1;
+
+	if (PR_PushIOLayer(pr_fd, PR_TOP_IO_LAYER, layer) != PR_SUCCESS)
+	{
+		PR_Close(layer);
+		ereport(COMMERROR,
+				(errmsg("unable to push IO layer")));
+		return -1;
+	}
+
+	server_cert = PK11_FindCertFromNickname(ssl_cert_file, (void *) port);
+	if (!server_cert)
+	{
+		if (dummy_ssl_passwd_cb_called)
+		{
+			ereport(COMMERROR,
+					(errmsg("unable to load certificate for \"%s\": %s",
+							ssl_cert_file, pg_SSLerrmessage(PR_GetError())),
+					 errhint("The certificate requires a password.")));
+			return -1;
+		}
+		else
+		{
+			ereport(COMMERROR,
+					(errmsg("unable to find certificate for \"%s\": %s",
+							ssl_cert_file, pg_SSLerrmessage(PR_GetError()))));
+			return -1;
+		}
+	}
+
+	private_key = PK11_FindKeyByAnyCert(server_cert, (void *) port);
+	if (!private_key)
+	{
+		if (dummy_ssl_passwd_cb_called)
+		{
+			ereport(COMMERROR,
+					(errmsg("unable to load private key for \"%s\": %s",
+							ssl_cert_file, pg_SSLerrmessage(PR_GetError())),
+					 errhint("The private key requires a password.")));
+			return -1;
+		}
+		else
+		{
+			ereport(COMMERROR,
+					(errmsg("unable to find private key for \"%s\": %s",
+							ssl_cert_file, pg_SSLerrmessage(PR_GetError()))));
+			return -1;
+		}
+	}
+
+	/*
+	 * NSS doesn't use CRL files on disk, so we use the ssl_crl_file guc to
+	 * contain the CRL nickname for the current server certificate in the NSS
+	 * certificate database. The main difference from the OpenSSL backend is
+	 * that NSS will use the CRL regardless, but being able to make sure the
+	 * CRL is loaded seems like a good feature.
+	 */
+	if (ssl_crl_file[0])
+	{
+		SECITEM_CopyItem(NULL, &crlname, &server_cert->derSubject);
+		crl = SEC_FindCrlByName(CERT_GetDefaultCertDB(), &crlname, SEC_CRL_TYPE);
+		if (!crl)
+		{
+			ereport(COMMERROR,
+					(errmsg("specified CRL not found in database")));
+			return -1;
+		}
+		SEC_DestroyCrl(crl);
+	}
+
+	/*
+	 * Finally we must configure the socket for being a server by setting the
+	 * certificate and key. The NULL parameter is an SSLExtraServerCertData
+	 * pointer with the final parameter being the size of the extra server
+	 * cert data structure pointed to. This is typically only used for
+	 * credential delegation.
+	 */
+	status = SSL_ConfigServerCert(model, server_cert, private_key, NULL, 0);
+	if (status != SECSuccess)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to configure server for TLS server connections: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+		return -1;
+	}
+
+	ssl_loaded_verify_locations = true;
+
+	/*
+	 * At this point, we no longer have use for the certificate and private
+	 * key as they have been copied into the context by NSS. Destroy our
+	 * copies explicitly to clean out the memory as best we can.
+	 */
+	CERT_DestroyCertificate(server_cert);
+	SECKEY_DestroyPrivateKey(private_key);
+
+	status = SSL_AuthCertificateHook(model, pg_cert_auth_handler, (void *) port);
+	if (status != SECSuccess)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to install authcert hook: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+		return -1;
+	}
+	SSL_BadCertHook(model, pg_bad_cert_handler, (void *) port);
+	SSL_OptionSet(model, SSL_REQUEST_CERTIFICATE, PR_TRUE);
+	SSL_OptionSet(model, SSL_REQUIRE_CERTIFICATE, PR_FALSE);
+
+	port->pr_fd = SSL_ImportFD(model, pr_fd);
+	if (!port->pr_fd)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to initialize")));
+		return -1;
+	}
+
+	PR_Close(model);
+
+	/*
+	 * Force a handshake on the next I/O request, the second parameter means
+	 * that we are a server, PR_FALSE would indicate being a client. NSPR
+	 * requires us to call SSL_ResetHandshake since we imported an already
+	 * established socket.
+	 */
+	status = SSL_ResetHandshake(port->pr_fd, PR_TRUE);
+	if (status != SECSuccess)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to initiate handshake: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+		return -1;
+	}
+	status = SSL_ForceHandshake(port->pr_fd);
+	if (status != SECSuccess)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to handshake: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+		return -1;
+	}
+
+	port->ssl_in_use = true;
+	return 0;
+}
+
+ssize_t
+be_tls_read(Port *port, void *ptr, size_t len, int *waitfor)
+{
+	ssize_t		n_read;
+	PRErrorCode err;
+
+	n_read = PR_Read(port->pr_fd, ptr, len);
+
+	if (n_read < 0)
+	{
+		err = PR_GetError();
+
+		if (err == PR_WOULD_BLOCK_ERROR)
+		{
+			*waitfor = WL_SOCKET_READABLE;
+			errno = EWOULDBLOCK;
+		}
+		else
+			errno = ECONNRESET;
+	}
+
+	return n_read;
+}
+
+ssize_t
+be_tls_write(Port *port, void *ptr, size_t len, int *waitfor)
+{
+	ssize_t		n_write;
+	PRErrorCode err;
+	PRIntn		flags = 0;
+
+	/*
+	 * The flags parameter to PR_Send is no longer used and is, according to
+	 * the documentation, required to be zero.
+	 */
+	n_write = PR_Send(port->pr_fd, ptr, len, flags, PR_INTERVAL_NO_WAIT);
+
+	if (n_write < 0)
+	{
+		err = PR_GetError();
+
+		if (err == PR_WOULD_BLOCK_ERROR)
+		{
+			*waitfor = WL_SOCKET_WRITEABLE;
+			errno = EWOULDBLOCK;
+		}
+		else
+			errno = ECONNRESET;
+	}
+
+	return n_write;
+}
+
+void
+be_tls_close(Port *port)
+{
+	if (!port)
+		return;
+
+	if (port->peer_cn)
+	{
+		SSL_InvalidateSession(port->pr_fd);
+		pfree(port->peer_cn);
+		port->peer_cn = NULL;
+	}
+
+	PR_Close(port->pr_fd);
+	port->pr_fd = NULL;
+	port->ssl_in_use = false;
+
+	if (nss_context)
+	{
+		NSS_ShutdownContext(nss_context);
+		nss_context = NULL;
+	}
+}
+
+void
+be_tls_destroy(void)
+{
+	/*
+	 * It reads a bit odd to clear a session cache when we are destroying the
+	 * context altogether, but if the session cache isn't cleared before
+	 * shutting down the context it will fail with SEC_ERROR_BUSY.
+	 */
+	SSL_ClearSessionCache();
+}
+
+int
+be_tls_get_cipher_bits(Port *port)
+{
+	SECStatus	status;
+	SSLChannelInfo channel;
+	SSLCipherSuiteInfo suite;
+
+	status = SSL_GetChannelInfo(port->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+		goto error;
+
+	status = SSL_GetCipherSuiteInfo(channel.cipherSuite, &suite, sizeof(suite));
+	if (status != SECSuccess)
+		goto error;
+
+	return suite.effectiveKeyBits;
+
+error:
+	ereport(WARNING,
+			(errmsg("unable to extract TLS session information: %s",
+					pg_SSLerrmessage(PR_GetError()))));
+	return 0;
+}
+
+/*
+ * be_tls_get_compression
+ *
+ * NSS disabled support for TLS compression in version 3.33 and removed the
+ * code in a subsequent release. The API for retrieving information about
+ * compression as well as enabling it is kept for backwards compatibility, but
+ * we don't need to consult it since it was only available for SSLv3 which we
+ * don't support.
+ *
+ * https://bugzilla.mozilla.org/show_bug.cgi?id=1409587
+ */
+bool
+be_tls_get_compression(Port *port)
+{
+	return false;
+}
+
+/*
+ * be_tls_get_version
+ *
+ * Returns the protocol version used for the current connection, or NULL in
+ * case of errors.
+ */
+const char *
+be_tls_get_version(Port *port)
+{
+	SECStatus	status;
+	SSLChannelInfo channel;
+
+	status = SSL_GetChannelInfo(port->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+	{
+		ereport(WARNING,
+				(errmsg("unable to extract TLS session information: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+		return NULL;
+	}
+
+	return ssl_protocol_version_to_string(channel.protocolVersion);
+}
+
+const char *
+be_tls_get_cipher(Port *port)
+{
+	SECStatus	status;
+	SSLChannelInfo channel;
+	SSLCipherSuiteInfo suite;
+
+	status = SSL_GetChannelInfo(port->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+		goto error;
+
+	status = SSL_GetCipherSuiteInfo(channel.cipherSuite, &suite, sizeof(suite));
+	if (status != SECSuccess)
+		goto error;
+
+	return suite.cipherSuiteName;
+
+error:
+	ereport(WARNING,
+			(errmsg("unable to extract TLS session information: %s",
+					pg_SSLerrmessage(PR_GetError()))));
+	return NULL;
+}
+
+void
+be_tls_get_peer_subject_name(Port *port, char *ptr, size_t len)
+{
+	CERTCertificate *certificate;
+
+	certificate = SSL_PeerCertificate(port->pr_fd);
+	if (certificate)
+		strlcpy(ptr, CERT_NameToAscii(&certificate->subject), len);
+	else
+		ptr[0] = '\0';
+}
+
+void
+be_tls_get_peer_issuer_name(Port *port, char *ptr, size_t len)
+{
+	CERTCertificate *certificate;
+
+	certificate = SSL_PeerCertificate(port->pr_fd);
+	if (certificate)
+		strlcpy(ptr, CERT_NameToAscii(&certificate->issuer), len);
+	else
+		ptr[0] = '\0';
+}
+
+void
+be_tls_get_peer_serial(Port *port, char *ptr, size_t len)
+{
+	CERTCertificate *certificate;
+
+	certificate = SSL_PeerCertificate(port->pr_fd);
+	if (certificate)
+		snprintf(ptr, len, "%li", DER_GetInteger(&(certificate->serialNumber)));
+	else
+		ptr[0] = '\0';
+}
+
+char *
+be_tls_get_certificate_hash(Port *port, size_t *len)
+{
+	CERTCertificate *certificate;
+	SECOidTag	signature_alg;
+	SECOidTag	digest_alg;
+	int			digest_len;
+	const NSSSignatureAlgorithms *candidate;
+	SECStatus	status;
+	PLArenaPool *arena = NULL;
+	SECItem		digest;
+	char	   *ret;
+
+	*len = 0;
+	certificate = SSL_LocalCertificate(port->pr_fd);
+	if (!certificate)
+		return NULL;
+
+	signature_alg = SECOID_GetAlgorithmTag(&certificate->signature);
+
+	candidate = NSS_SCRAMDigestAlgorithm;
+	while (candidate->signature)
+	{
+		if (signature_alg == candidate->signature)
+		{
+			digest_alg = candidate->hash;
+			digest_len = candidate->len;
+			break;
+		}
+
+		candidate++;
+	}
+
+	if (!candidate->signature)
+		elog(ERROR, "could not find digest for OID '%s'",
+			 SECOID_FindOIDTagDescription(signature_alg));
+
+	arena = PORT_NewArena(SEC_ASN1_DEFAULT_ARENA_SIZE);
+	digest.data = PORT_ArenaZAlloc(arena, sizeof(unsigned char) * digest_len);
+	digest.len = digest_len;
+
+	status = PK11_HashBuf(digest_alg, digest.data,
+						  certificate->derCert.data,
+						  certificate->derCert.len);
+
+	if (status != SECSuccess)
+	{
+		PORT_FreeArena(arena, PR_TRUE);
+		return NULL;
+	}
+
+	ret = palloc(digest.len);
+	memcpy(ret, digest.data, digest.len);
+	*len = digest_len;
+	PORT_FreeArena(arena, PR_TRUE);
+
+	return ret;
+}
+
+/* ------------------------------------------------------------ */
+/*						Internal functions						*/
+/* ------------------------------------------------------------ */
+
+/*
+ * default_nss_tls_init
+ *
+ * The default TLS init hook function which users can override for installing
+ * their own passphrase callbacks and similar actions. In case no callback has
+ * been configured, or the callback isn't reload capable during a server
+ * reload, the dummy callback will be installed.
+ *
+ * The private data for the callback is set differently depending on how it's
+ * invoked. For calls which may invoke the callback deeper in the callstack
+ * the private data is set with SSL_SetPKCS11PinArg. When the call is directly
+ * invoking the callback, like PK11_FindCertFromNickname, then the private
+ * data is passed as a parameter. Setting the data with SSL_SetPKCS11PinArg is
+ * thus not required but good practice.
+ *
+ * NSS doesn't provide a default callback like OpenSSL does, but a callback is
+ * required to be set.  The password callback can be installed at any time, but
+ * setting the private data with SSL_SetPKCS11PinArg requires a PR Filedesc.
+ */
+static void
+default_nss_tls_init(bool isServerStart)
+{
+	/*
+	 * No user-defined callback has been configured, install the dummy call-
+	 * back since we must set something.
+	 */
+	if (!ssl_passphrase_command[0])
+		PK11_SetPasswordFunc(dummy_ssl_passphrase_cb);
+	else
+	{
+		/*
+		 * There is a user-defined callback, set it unless we are in a restart
+		 * and cannot handle restarts due to an interactive callback.
+		 */
+		if (isServerStart)
+			PK11_SetPasswordFunc(external_ssl_passphrase_cb);
+		else
+		{
+			if (ssl_passphrase_command_supports_reload)
+				PK11_SetPasswordFunc(external_ssl_passphrase_cb);
+			else
+				PK11_SetPasswordFunc(dummy_ssl_passphrase_cb);
+		}
+	}
+}
+
+/*
+ * external_ssl_passphrase_cb
+ *
+ * Runs the callback configured by ssl_passphrase_command and returns the
+ * captured password back to NSS.
+ */
+static char *
+external_ssl_passphrase_cb(PK11SlotInfo *slot, PRBool retry, void *arg)
+{
+	/*
+	 * NSS use a hardcoded 256 byte buffer for reading the password so set the
+	 * same limit for our callback buffer.
+	 */
+	char		buf[256];
+	int			len;
+	char	   *password = NULL;
+	char	   *prompt;
+
+	/*
+	 * Since there is no password callback in NSS when the server starts up,
+	 * it makes little sense to create an interactive callback. Thus, if this
+	 * is a retry attempt then give up immediately.
+	 */
+	if (retry)
+		return NULL;
+
+	/*
+	 * Construct the same prompt that NSS uses internally even though it is
+	 * unlikely to serve much purpose, but we must set a prompt so we might as
+	 * well do it right.
+	 */
+	prompt = psprintf("Enter Password or Pin for \"%s\":",
+					  PK11_GetTokenName(slot));
+
+	len = run_ssl_passphrase_command(prompt, ssl_is_server_start, buf, sizeof(buf));
+	pfree(prompt);
+
+	if (!len)
+		return NULL;
+
+	/*
+	 * At least one byte with password content was returned, and NSS requires
+	 * that we return it allocated in NSS controlled memory. If we fail to
+	 * allocate then abort without passing back NULL and bubble up the error
+	 * on the PG side.
+	 */
+	password = (char *) PR_Malloc(len + 1);
+	if (!password)
+	{
+		explicit_bzero(buf, sizeof(buf));
+		ereport(ERROR,
+				(errcode(ERRCODE_OUT_OF_MEMORY),
+				 errmsg("out of memory")));
+	}
+	strlcpy(password, buf, sizeof(password));
+	explicit_bzero(buf, sizeof(buf));
+
+	return password;
+}
+
+/*
+ * dummy_ssl_passphrase_cb
+ *
+ * Return unsuccessful if we are asked to provide the passphrase for a cert or
+ * key, without having a passphrase callback installed.
+ */
+static char *
+dummy_ssl_passphrase_cb(PK11SlotInfo *slot, PRBool retry, void *arg)
+{
+	dummy_ssl_passwd_cb_called = true;
+	return NULL;
+}
+
+static SECStatus
+pg_bad_cert_handler(void *arg, PRFileDesc * fd)
+{
+	Port	   *port = (Port *) arg;
+
+	port->peer_cert_valid = false;
+	return SECFailure;
+}
+
+static SECStatus
+pg_cert_auth_handler(void *arg, PRFileDesc * fd, PRBool checksig, PRBool isServer)
+{
+	SECStatus	status;
+	Port	   *port = (Port *) arg;
+	CERTCertificate *cert;
+	char	   *peer_cn;
+	int			len;
+
+	status = SSL_AuthCertificate(CERT_GetDefaultCertDB(), port->pr_fd, checksig, PR_TRUE);
+	if (status == SECSuccess)
+	{
+		cert = SSL_PeerCertificate(port->pr_fd);
+		len = strlen(cert->subjectName);
+		peer_cn = MemoryContextAllocZero(TopMemoryContext, len + 1);
+
+		/*
+		 * Skip over the key= portion of the key=value containing the peer CN.
+		 */
+		if (strncmp(cert->subjectName, "CN=", 3) == 0)
+			strlcpy(peer_cn, cert->subjectName + strlen("CN="), len + 1);
+		else
+			strlcpy(peer_cn, cert->subjectName, len + 1);
+		CERT_DestroyCertificate(cert);
+
+		port->peer_cn = peer_cn;
+		port->peer_cert_valid = true;
+	}
+
+	return status;
+}
+
+static PRInt32
+pg_ssl_read(PRFileDesc *fd, void *buf, PRInt32 amount, PRIntn flags,
+			PRIntervalTime timeout)
+{
+	PRRecvFN	read_fn;
+	PRInt32		n_read;
+
+	read_fn = fd->lower->methods->recv;
+	n_read = read_fn(fd->lower, buf, amount, flags, timeout);
+
+	return n_read;
+}
+
+static PRInt32
+pg_ssl_write(PRFileDesc *fd, const void *buf, PRInt32 amount, PRIntn flags,
+			 PRIntervalTime timeout)
+{
+	PRSendFN	send_fn;
+	PRInt32		n_write;
+
+	send_fn = fd->lower->methods->send;
+	n_write = send_fn(fd->lower, buf, amount, flags, timeout);
+
+	return n_write;
+}
+
+static PRStatus
+pg_ssl_close(PRFileDesc *fd)
+{
+	/*
+	 * Disconnect our private Port from the fd before closing out the stack.
+	 * (Debug builds of NSPR will assert if we do not.)
+	 */
+	fd->secret = NULL;
+	return PR_GetDefaultIOMethods()->close(fd);
+}
+
+static PRFileDesc *
+init_iolayer(Port *port)
+{
+	const		PRIOMethods *default_methods;
+	PRFileDesc *layer;
+
+	/*
+	 * Start by initializing our layer with all the default methods so that we
+	 * can selectively override the ones we want while still ensuring that we
+	 * have a complete layer specification.
+	 */
+	default_methods = PR_GetDefaultIOMethods();
+	memcpy(&pr_iomethods, default_methods, sizeof(PRIOMethods));
+
+	pr_iomethods.recv = pg_ssl_read;
+	pr_iomethods.send = pg_ssl_write;
+	pr_iomethods.close = pg_ssl_close;
+
+	/*
+	 * Each IO layer must be identified by a unique name, where uniqueness is
+	 * per connection. Each connection in a postgres cluster can generate the
+	 * identity from the same string as they will create their IO layers on
+	 * different sockets. Only one layer per socket can have the same name.
+	 */
+	pr_id = PR_GetUniqueIdentity("PostgreSQL Server");
+	if (pr_id == PR_INVALID_IO_LAYER)
+	{
+		ereport(ERROR,
+				(errmsg("out of memory when setting up TLS connection")));
+		return NULL;
+	}
+
+	/*
+	 * Create the actual IO layer as a stub such that it can be pushed onto
+	 * the layer stack. The step via a stub is required as we define custom
+	 * callbacks.
+	 */
+	layer = PR_CreateIOLayerStub(pr_id, &pr_iomethods);
+	if (!layer)
+	{
+		ereport(ERROR,
+				(errmsg("unable to create NSS I/O layer")));
+		return NULL;
+	}
+
+	/* Store the Port as private data available in callbacks */
+	layer->secret = (void *) port;
+
+	return layer;
+}
+
+static char *
+ssl_protocol_version_to_string(int v)
+{
+	switch (v)
+	{
+			/* SSL v2 and v3 are not supported */
+		case SSL_LIBRARY_VERSION_2:
+		case SSL_LIBRARY_VERSION_3_0:
+			Assert(false);
+			break;
+
+		case SSL_LIBRARY_VERSION_TLS_1_0:
+			return pstrdup("TLSv1.0");
+		case SSL_LIBRARY_VERSION_TLS_1_1:
+			return pstrdup("TLSv1.1");
+		case SSL_LIBRARY_VERSION_TLS_1_2:
+			return pstrdup("TLSv1.2");
+		case SSL_LIBRARY_VERSION_TLS_1_3:
+			return pstrdup("TLSv1.3");
+	}
+
+	return pstrdup("unknown");
+}
+
+
+/*
+ * ssl_protocol_version_to_nss
+ *			Translate PostgreSQL TLS version to NSS version
+ *
+ * Returns zero in case the requested TLS version is undefined (PG_ANY) and
+ * should be set by the caller, or -1 on failure.
+ */
+static uint16
+ssl_protocol_version_to_nss(int v, const char *guc_name)
+{
+	switch (v)
+	{
+			/*
+			 * There is no SSL_LIBRARY_ macro defined in NSS with the value
+			 * zero, so we use this to signal the caller that the highest
+			 * useful version should be set on the connection.
+			 */
+		case PG_TLS_ANY:
+			return 0;
+
+			/*
+			 * No guard is required here as there are no versions of NSS
+			 * without support for TLS1.
+			 */
+		case PG_TLS1_VERSION:
+			return SSL_LIBRARY_VERSION_TLS_1_0;
+		case PG_TLS1_1_VERSION:
+#ifdef SSL_LIBRARY_VERSION_TLS_1_1
+			return SSL_LIBRARY_VERSION_TLS_1_1;
+#else
+			break;
+#endif
+		case PG_TLS1_2_VERSION:
+#ifdef SSL_LIBRARY_VERSION_TLS_1_2
+			return SSL_LIBRARY_VERSION_TLS_1_2;
+#else
+			break;
+#endif
+		case PG_TLS1_3_VERSION:
+#ifdef SSL_LIBRARY_VERSION_TLS_1_3
+			return SSL_LIBRARY_VERSION_TLS_1_3;
+#else
+			break;
+#endif
+		default:
+			break;
+	}
+
+	return -1;
+}
+
+/*
+ * pg_SSLerrmessage
+ *		Create and return a human readable error message given
+ *		the specified error code
+ *
+ * PR_ErrorToName only converts the enum identifier of the error to string,
+ * but that can be quite useful for debugging (and in case PR_ErrorToString is
+ * unable to render a message then we at least have something).
+ */
+static char *
+pg_SSLerrmessage(PRErrorCode errcode)
+{
+	return psprintf("%s (%s)",
+					PR_ErrorToString(errcode, PR_LANGUAGE_I_DEFAULT),
+					PR_ErrorToName(errcode));
+}
diff --git a/src/backend/libpq/be-secure.c b/src/backend/libpq/be-secure.c
index 4cf139a223..5e0c27c134 100644
--- a/src/backend/libpq/be-secure.c
+++ b/src/backend/libpq/be-secure.c
@@ -49,6 +49,9 @@ bool		ssl_passphrase_command_supports_reload;
 #ifdef USE_SSL
 bool		ssl_loaded_verify_locations = false;
 #endif
+#ifdef USE_NSS
+char	   *ssl_database;
+#endif
 
 /* GUC variable controlling SSL cipher list */
 char	   *SSLCipherSuites = NULL;
diff --git a/src/backend/libpq/hba.c b/src/backend/libpq/hba.c
index 371dccb852..9a04c093d5 100644
--- a/src/backend/libpq/hba.c
+++ b/src/backend/libpq/hba.c
@@ -1041,7 +1041,7 @@ parse_hba_line(TokenizedLine *tok_line, int elevel)
 			ereport(elevel,
 					(errcode(ERRCODE_CONFIG_FILE_ERROR),
 					 errmsg("hostssl record cannot match because SSL is not supported by this build"),
-					 errhint("Compile with --with-openssl to use SSL connections."),
+					 errhint("Compile with --with-ssl to use SSL connections."),
 					 errcontext("line %d of configuration file \"%s\"",
 								line_num, HbaFileName)));
 			*err_msg = "hostssl record cannot match because SSL is not supported by this build";
diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c
index eafdb1118e..b023b31c46 100644
--- a/src/backend/utils/misc/guc.c
+++ b/src/backend/utils/misc/guc.c
@@ -4308,7 +4308,11 @@ static struct config_string ConfigureNamesString[] =
 		},
 		&ssl_library,
 #ifdef USE_SSL
+#if defined(USE_OPENSSL)
 		"OpenSSL",
+#elif defined(USE_NSS)
+		"NSS",
+#endif
 #else
 		"",
 #endif
@@ -4366,6 +4370,18 @@ static struct config_string ConfigureNamesString[] =
 		check_canonical_path, assign_pgstat_temp_directory, NULL
 	},
 
+#ifdef USE_NSS
+	{
+		{"ssl_database", PGC_SIGHUP, CONN_AUTH_SSL,
+			gettext_noop("Location of the NSS certificate database."),
+			NULL
+		},
+		&ssl_database,
+		"",
+		NULL, NULL, NULL
+	},
+#endif
+
 	{
 		{"synchronous_standby_names", PGC_SIGHUP, REPLICATION_PRIMARY,
 			gettext_noop("Number of synchronous standbys and list of names of potential synchronous ones."),
@@ -4394,8 +4410,10 @@ static struct config_string ConfigureNamesString[] =
 			GUC_SUPERUSER_ONLY
 		},
 		&SSLCipherSuites,
-#ifdef USE_OPENSSL
+#if defined(USE_OPENSSL)
 		"HIGH:MEDIUM:+3DES:!aNULL",
+#elif defined (USE_NSS)
+		"",
 #else
 		"none",
 #endif
diff --git a/src/common/Makefile b/src/common/Makefile
index 5422579a6a..be8b2583b2 100644
--- a/src/common/Makefile
+++ b/src/common/Makefile
@@ -85,12 +85,17 @@ OBJS_COMMON += \
 	protocol_openssl.o \
 	cryptohash_openssl.o
 else
+ifeq ($(with_ssl),nss)
+OBJS_COMMON += \
+	cryptohash_nss.o
+else
 OBJS_COMMON += \
 	cryptohash.o \
 	md5.o \
 	sha1.o \
 	sha2.o
 endif
+endif
 
 # A few files are currently only built for frontend, not server
 # (Mkvcbuild.pm has a copy of this list, too).  logging.c is excluded
diff --git a/src/include/common/pg_nss.h b/src/include/common/pg_nss.h
new file mode 100644
index 0000000000..008fee85f1
--- /dev/null
+++ b/src/include/common/pg_nss.h
@@ -0,0 +1,175 @@
+/*-------------------------------------------------------------------------
+ *
+ * pg_nss.h
+ *	  Support for NSS as a TLS backend
+ *
+ * These definitions are used by both frontend and backend code.
+ *
+ * Copyright (c) 2020, PostgreSQL Global Development Group
+ *
+ * IDENTIFICATION
+ *        src/include/common/pg_nss.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef PG_NSS_H
+#define PG_NSS_H
+
+#ifdef USE_NSS
+#define NO_NSPR_10_SUPPORT
+#include <nss/hasht.h>
+#include <nss/secoidt.h>
+#include <nss/sslproto.h>
+
+PRUint16	pg_find_cipher(char *name);
+
+typedef struct
+{
+	SECOidTag	signature;
+	SECOidTag	hash;
+	int			len;
+}			NSSSignatureAlgorithms;
+
+typedef struct
+{
+	const char *name;
+	PRUint16	number;
+}			NSSCiphers;
+
+#define INVALID_CIPHER	0xFFFF
+
+static const NSSSignatureAlgorithms NSS_SCRAMDigestAlgorithm[] = {
+
+	{SEC_OID_PKCS1_MD5_WITH_RSA_ENCRYPTION, SEC_OID_SHA256, SHA256_LENGTH},
+	{SEC_OID_PKCS1_SHA1_WITH_RSA_ENCRYPTION, SEC_OID_SHA256, SHA256_LENGTH},
+	{SEC_OID_ISO_SHA_WITH_RSA_SIGNATURE, SEC_OID_SHA256, SHA256_LENGTH},
+	{SEC_OID_ISO_SHA1_WITH_RSA_SIGNATURE, SEC_OID_SHA256, SHA256_LENGTH},
+	{SEC_OID_PKCS5_PBE_WITH_MD5_AND_DES_CBC, SEC_OID_SHA256, SHA256_LENGTH},
+
+	{SEC_OID_ANSIX962_ECDSA_SHA224_SIGNATURE, SEC_OID_SHA224, SHA224_LENGTH},
+	{SEC_OID_PKCS1_SHA224_WITH_RSA_ENCRYPTION, SEC_OID_SHA224, SHA224_LENGTH},
+	{SEC_OID_NIST_DSA_SIGNATURE_WITH_SHA224_DIGEST, SEC_OID_SHA224, SHA224_LENGTH},
+
+	{SEC_OID_ANSIX962_ECDSA_SHA256_SIGNATURE, SEC_OID_SHA256, SHA256_LENGTH},
+	{SEC_OID_PKCS1_SHA256_WITH_RSA_ENCRYPTION, SEC_OID_SHA256, SHA256_LENGTH},
+	{SEC_OID_NIST_DSA_SIGNATURE_WITH_SHA256_DIGEST, SEC_OID_SHA256, SHA256_LENGTH},
+
+	{SEC_OID_ANSIX962_ECDSA_SHA384_SIGNATURE, SEC_OID_SHA384, SHA384_LENGTH},
+	{SEC_OID_PKCS1_SHA384_WITH_RSA_ENCRYPTION, SEC_OID_SHA384, SHA384_LENGTH},
+
+	{SEC_OID_ANSIX962_ECDSA_SHA512_SIGNATURE, SEC_OID_SHA512, SHA512_LENGTH},
+	{SEC_OID_PKCS1_SHA512_WITH_RSA_ENCRYPTION, SEC_OID_SHA512, SHA512_LENGTH},
+
+	{0, 0}
+};
+
+/*
+ * This list is a partial copy of the ciphers in NSS files lib/ssl/sslproto.h
+ * in order to provide a human readable version of the ciphers. It would be
+ * nice to not have to have this, but NSS doesn't provide any API addressing
+ * the ciphers by name. TODO: do we want more of the ciphers, or perhaps less?
+ */
+static const NSSCiphers NSS_CipherList[] = {
+
+	{"TLS_NULL_WITH_NULL_NULL", TLS_NULL_WITH_NULL_NULL},
+
+	{"TLS_RSA_WITH_NULL_MD5", TLS_RSA_WITH_NULL_MD5},
+	{"TLS_RSA_WITH_NULL_SHA", TLS_RSA_WITH_NULL_SHA},
+	{"TLS_RSA_WITH_RC4_128_MD5", TLS_RSA_WITH_RC4_128_MD5},
+	{"TLS_RSA_WITH_RC4_128_SHA", TLS_RSA_WITH_RC4_128_SHA},
+	{"TLS_RSA_WITH_IDEA_CBC_SHA", TLS_RSA_WITH_IDEA_CBC_SHA},
+	{"TLS_RSA_WITH_DES_CBC_SHA", TLS_RSA_WITH_DES_CBC_SHA},
+	{"TLS_RSA_WITH_3DES_EDE_CBC_SHA", TLS_RSA_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_DH_DSS_WITH_DES_CBC_SHA", TLS_DH_DSS_WITH_DES_CBC_SHA},
+	{"TLS_DH_DSS_WITH_3DES_EDE_CBC_SHA", TLS_DH_DSS_WITH_3DES_EDE_CBC_SHA},
+	{"TLS_DH_RSA_WITH_DES_CBC_SHA", TLS_DH_RSA_WITH_DES_CBC_SHA},
+	{"TLS_DH_RSA_WITH_3DES_EDE_CBC_SHA", TLS_DH_RSA_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_DHE_DSS_WITH_DES_CBC_SHA", TLS_DHE_DSS_WITH_DES_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_3DES_EDE_CBC_SHA", TLS_DHE_DSS_WITH_3DES_EDE_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_DES_CBC_SHA", TLS_DHE_RSA_WITH_DES_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA", TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_DH_anon_WITH_RC4_128_MD5", TLS_DH_anon_WITH_RC4_128_MD5},
+	{"TLS_DH_anon_WITH_DES_CBC_SHA", TLS_DH_anon_WITH_DES_CBC_SHA},
+	{"TLS_DH_anon_WITH_3DES_EDE_CBC_SHA", TLS_DH_anon_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_RSA_WITH_AES_128_CBC_SHA", TLS_RSA_WITH_AES_128_CBC_SHA},
+	{"TLS_DH_DSS_WITH_AES_128_CBC_SHA", TLS_DH_DSS_WITH_AES_128_CBC_SHA},
+	{"TLS_DH_RSA_WITH_AES_128_CBC_SHA", TLS_DH_RSA_WITH_AES_128_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_AES_128_CBC_SHA", TLS_DHE_DSS_WITH_AES_128_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_AES_128_CBC_SHA", TLS_DHE_RSA_WITH_AES_128_CBC_SHA},
+	{"TLS_DH_anon_WITH_AES_128_CBC_SHA", TLS_DH_anon_WITH_AES_128_CBC_SHA},
+
+	{"TLS_RSA_WITH_AES_256_CBC_SHA", TLS_RSA_WITH_AES_256_CBC_SHA},
+	{"TLS_DH_DSS_WITH_AES_256_CBC_SHA", TLS_DH_DSS_WITH_AES_256_CBC_SHA},
+	{"TLS_DH_RSA_WITH_AES_256_CBC_SHA", TLS_DH_RSA_WITH_AES_256_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_AES_256_CBC_SHA", TLS_DHE_DSS_WITH_AES_256_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_AES_256_CBC_SHA", TLS_DHE_RSA_WITH_AES_256_CBC_SHA},
+	{"TLS_DH_anon_WITH_AES_256_CBC_SHA", TLS_DH_anon_WITH_AES_256_CBC_SHA},
+	{"TLS_RSA_WITH_NULL_SHA256", TLS_RSA_WITH_NULL_SHA256},
+	{"TLS_RSA_WITH_AES_128_CBC_SHA256", TLS_RSA_WITH_AES_128_CBC_SHA256},
+	{"TLS_RSA_WITH_AES_256_CBC_SHA256", TLS_RSA_WITH_AES_256_CBC_SHA256},
+
+	{"TLS_DHE_DSS_WITH_AES_128_CBC_SHA256", TLS_DHE_DSS_WITH_AES_128_CBC_SHA256},
+	{"TLS_RSA_WITH_CAMELLIA_128_CBC_SHA", TLS_RSA_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DH_DSS_WITH_CAMELLIA_128_CBC_SHA", TLS_DH_DSS_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DH_RSA_WITH_CAMELLIA_128_CBC_SHA", TLS_DH_RSA_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_CAMELLIA_128_CBC_SHA", TLS_DHE_DSS_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA", TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DH_anon_WITH_CAMELLIA_128_CBC_SHA", TLS_DH_anon_WITH_CAMELLIA_128_CBC_SHA},
+
+	{"TLS_DHE_DSS_WITH_RC4_128_SHA", TLS_DHE_DSS_WITH_RC4_128_SHA},
+	{"TLS_DHE_RSA_WITH_AES_128_CBC_SHA256", TLS_DHE_RSA_WITH_AES_128_CBC_SHA256},
+	{"TLS_DHE_DSS_WITH_AES_256_CBC_SHA256", TLS_DHE_DSS_WITH_AES_256_CBC_SHA256},
+	{"TLS_DHE_RSA_WITH_AES_256_CBC_SHA256", TLS_DHE_RSA_WITH_AES_256_CBC_SHA256},
+
+	{"TLS_RSA_WITH_CAMELLIA_256_CBC_SHA", TLS_RSA_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DH_DSS_WITH_CAMELLIA_256_CBC_SHA", TLS_DH_DSS_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DH_RSA_WITH_CAMELLIA_256_CBC_SHA", TLS_DH_RSA_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_CAMELLIA_256_CBC_SHA", TLS_DHE_DSS_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA", TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DH_anon_WITH_CAMELLIA_256_CBC_SHA", TLS_DH_anon_WITH_CAMELLIA_256_CBC_SHA},
+
+	{"TLS_RSA_WITH_SEED_CBC_SHA", TLS_RSA_WITH_SEED_CBC_SHA},
+
+	{"TLS_RSA_WITH_AES_128_GCM_SHA256", TLS_RSA_WITH_AES_128_GCM_SHA256},
+	{"TLS_RSA_WITH_AES_256_GCM_SHA384", TLS_RSA_WITH_AES_256_GCM_SHA384},
+	{"TLS_DHE_RSA_WITH_AES_128_GCM_SHA256", TLS_DHE_RSA_WITH_AES_128_GCM_SHA256},
+	{"TLS_DHE_RSA_WITH_AES_256_GCM_SHA384", TLS_DHE_RSA_WITH_AES_256_GCM_SHA384},
+	{"TLS_DHE_DSS_WITH_AES_128_GCM_SHA256", TLS_DHE_DSS_WITH_AES_128_GCM_SHA256},
+	{"TLS_DHE_DSS_WITH_AES_256_GCM_SHA384", TLS_DHE_DSS_WITH_AES_256_GCM_SHA384},
+
+	{"TLS_AES_128_GCM_SHA256", TLS_AES_128_GCM_SHA256},
+	{"TLS_AES_256_GCM_SHA384", TLS_AES_256_GCM_SHA384},
+	{"TLS_CHACHA20_POLY1305_SHA256", TLS_CHACHA20_POLY1305_SHA256},
+	{NULL, 0}
+};
+
+/*
+ * pg_find_cipher
+ *			Translate an NSS ciphername to the cipher code
+ *
+ * Searches the configured ciphers for the corresponding cipher code to the
+ * name. Search is performed case insensitive.
+ */
+PRUint16
+pg_find_cipher(char *name)
+{
+	const		NSSCiphers *cipher_list = NSS_CipherList;
+
+	while (cipher_list->name)
+	{
+		if (pg_strcasecmp(cipher_list->name, name) == 0)
+			return cipher_list->number;
+
+		cipher_list++;
+	}
+
+	return 0xFFFF;
+}
+
+#endif							/* USE_NSS */
+
+#endif							/* PG_NSS_H */
diff --git a/src/include/libpq/libpq-be.h b/src/include/libpq/libpq-be.h
index 66a8673d93..ea373a0ae0 100644
--- a/src/include/libpq/libpq-be.h
+++ b/src/include/libpq/libpq-be.h
@@ -193,13 +193,18 @@ typedef struct Port
 	bool		peer_cert_valid;
 
 	/*
-	 * OpenSSL structures. (Keep these last so that the locations of other
-	 * fields are the same whether or not you build with OpenSSL.)
+	 * SSL backend specific structures. (Keep these last so that the locations
+	 * of other fields are the same whether or not you build with SSL
+	 * enabled.)
 	 */
 #ifdef USE_OPENSSL
 	SSL		   *ssl;
 	X509	   *peer;
 #endif
+
+#ifdef USE_NSS
+	void	   *pr_fd;
+#endif
 } Port;
 
 #ifdef USE_SSL
@@ -283,7 +288,7 @@ extern void be_tls_get_peer_serial(Port *port, char *ptr, size_t len);
  * This is not supported with old versions of OpenSSL that don't have
  * the X509_get_signature_nid() function.
  */
-#if defined(USE_OPENSSL) && defined(HAVE_X509_GET_SIGNATURE_NID)
+#if defined(USE_NSS) || (defined(USE_OPENSSL) && defined(HAVE_X509_GET_SIGNATURE_NID))
 #define HAVE_BE_TLS_GET_CERTIFICATE_HASH
 extern char *be_tls_get_certificate_hash(Port *port, size_t *len);
 #endif
@@ -293,6 +298,10 @@ extern char *be_tls_get_certificate_hash(Port *port, size_t *len);
 typedef void (*openssl_tls_init_hook_typ) (SSL_CTX *context, bool isServerStart);
 extern PGDLLIMPORT openssl_tls_init_hook_typ openssl_tls_init_hook;
 #endif
+#ifdef USE_NSS
+typedef void (*nss_tls_init_hook_type) (bool isServerStart);
+extern PGDLLIMPORT nss_tls_init_hook_type nss_tls_init_hook;
+#endif
 
 #endif							/* USE_SSL */
 
diff --git a/src/include/libpq/libpq.h b/src/include/libpq/libpq.h
index a55898c85a..d2860b852f 100644
--- a/src/include/libpq/libpq.h
+++ b/src/include/libpq/libpq.h
@@ -88,6 +88,9 @@ extern PGDLLIMPORT bool ssl_passphrase_command_supports_reload;
 #ifdef USE_SSL
 extern bool ssl_loaded_verify_locations;
 #endif
+#ifdef USE_NSS
+extern char *ssl_database;
+#endif
 
 extern int	secure_initialize(bool isServerStart);
 extern bool secure_loaded_verify_locations(void);
diff --git a/src/include/pg_config.h.in b/src/include/pg_config.h.in
index f4d9f3b408..8856a33590 100644
--- a/src/include/pg_config.h.in
+++ b/src/include/pg_config.h.in
@@ -899,12 +899,15 @@
 /* Define to select named POSIX semaphores. */
 #undef USE_NAMED_POSIX_SEMAPHORES
 
-/* Define to build with OpenSSL support. (--with-openssl) */
+/* Define to build with OpenSSL support. (--with-ssl=openssl) */
 #undef USE_OPENSSL
 
 /* Define to 1 to build with PAM support. (--with-pam) */
 #undef USE_PAM
 
+/* Define to build with NSS support (--with-ssl=nss) */
+#undef USE_NSS
+
 /* Define to 1 to use software CRC-32C implementation (slicing-by-8). */
 #undef USE_SLICING_BY_8_CRC32C
 
diff --git a/src/include/pg_config_manual.h b/src/include/pg_config_manual.h
index d27c8601fa..7861b94290 100644
--- a/src/include/pg_config_manual.h
+++ b/src/include/pg_config_manual.h
@@ -176,10 +176,9 @@
 
 /*
  * USE_SSL code should be compiled only when compiling with an SSL
- * implementation.  (Currently, only OpenSSL is supported, but we might add
- * more implementations in the future.)
+ * implementation.
  */
-#ifdef USE_OPENSSL
+#if defined(USE_OPENSSL) || defined(USE_NSS)
 #define USE_SSL
 #endif
 
diff --git a/src/interfaces/libpq/Makefile b/src/interfaces/libpq/Makefile
index c5ef0bead5..837e105ffe 100644
--- a/src/interfaces/libpq/Makefile
+++ b/src/interfaces/libpq/Makefile
@@ -55,6 +55,11 @@ OBJS += \
 	fe-secure-openssl.o
 endif
 
+ifeq ($(with_ssl), nss)
+OBJS += \
+	fe-secure-nss.o
+endif
+
 ifeq ($(with_gssapi),yes)
 OBJS += \
 	fe-gssapi-common.o \
diff --git a/src/interfaces/libpq/fe-connect.c b/src/interfaces/libpq/fe-connect.c
index 8ca0583aa9..1eeeff54a8 100644
--- a/src/interfaces/libpq/fe-connect.c
+++ b/src/interfaces/libpq/fe-connect.c
@@ -355,6 +355,10 @@ static const internalPQconninfoOption PQconninfoOptions[] = {
 		"Target-Session-Attrs", "", 11, /* sizeof("read-write") = 11 */
 	offsetof(struct pg_conn, target_session_attrs)},
 
+	{"cert_database", NULL, NULL, NULL,
+		"CertificateDatabase", "", 64,
+	offsetof(struct pg_conn, cert_database)},
+
 	/* Terminating entry --- MUST BE LAST */
 	{NULL, NULL, NULL, NULL,
 	NULL, NULL, 0}
diff --git a/src/interfaces/libpq/fe-secure-nss.c b/src/interfaces/libpq/fe-secure-nss.c
new file mode 100644
index 0000000000..dca0572e67
--- /dev/null
+++ b/src/interfaces/libpq/fe-secure-nss.c
@@ -0,0 +1,1112 @@
+/*-------------------------------------------------------------------------
+ *
+ * fe-secure-nss.c
+ *	  functions for supporting NSS as a TLS backend for frontend libpq
+ *
+ * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ *	  src/interfaces/libpq/fe-secure-nss.c
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#include "postgres_fe.h"
+
+#include "libpq-fe.h"
+#include "fe-auth.h"
+#include "fe-secure-common.h"
+#include "libpq-int.h"
+#include "common/pg_nss.h"
+
+/*
+ * BITS_PER_BYTE is also defined in the NSPR header files, so we need to undef
+ * our version to avoid compiler warnings on redefinition.
+ */
+#define pg_BITS_PER_BYTE BITS_PER_BYTE
+#undef BITS_PER_BYTE
+
+/*
+ * The nspr/obsolete/protypes.h NSPR header typedefs uint64 and int64 with
+ * colliding definitions from ours, causing a much expected compiler error.
+ * Remove backwards compatibility with ancient NSPR versions to avoid this.
+ */
+#define NO_NSPR_10_SUPPORT
+#include <nspr/nspr.h>
+#include <nspr/prerror.h>
+#include <nspr/prinit.h>
+#include <nspr/prio.h>
+#include <nss/hasht.h>
+#include <nss/nss.h>
+#include <nss/ssl.h>
+#include <nss/sslproto.h>
+#include <nss/pk11func.h>
+#include <nss/secerr.h>
+#include <nss/secoidt.h>
+#include <nss/secmod.h>
+
+/*
+ * Ensure that the colliding definitions match, else throw an error. In case
+ * NSPR remove the definition in a future version (however unlikely that may
+ * be, make sure to put ours back again.
+ */
+#if defined(BITS_PER_BYTE)
+#if BITS_PER_BYTE != pg_BITS_PER_BYTE
+#error "incompatible byte widths between NSPR and PostgreSQL"
+#endif
+#else
+#define BITS_PER_BYTE pg_BITS_PER_BYTE
+#endif
+#undef pg_BITS_PER_BYTE
+
+static SECStatus pg_load_nss_module(SECMODModule * *module, const char *library, const char *name);
+static SECStatus pg_bad_cert_handler(void *arg, PRFileDesc * fd);
+static const char *pg_SSLerrmessage(PRErrorCode errcode);
+static SECStatus pg_client_auth_handler(void *arg, PRFileDesc * socket, CERTDistNames * caNames,
+										CERTCertificate * *pRetCert, SECKEYPrivateKey * *pRetKey);
+static SECStatus pg_cert_auth_handler(void *arg, PRFileDesc * fd, PRBool checksig, PRBool isServer);
+static int	ssl_protocol_version_to_nss(const char *protocol);
+static bool cert_database_has_CA(PGconn *conn);
+
+static char *PQssl_passwd_cb(PK11SlotInfo * slot, PRBool retry, void *arg);
+
+/*
+ * PR_ImportTCPSocket() is a private API, but very widely used, as it's the
+ * only way to make NSS use an already set up POSIX file descriptor rather
+ * than opening one itself. To quote the NSS documentation:
+ *
+ *		"In theory, code that uses PR_ImportTCPSocket may break when NSPR's
+ *		implementation changes. In practice, this is unlikely to happen because
+ *		NSPR's implementation has been stable for years and because of NSPR's
+ *		strong commitment to backward compatibility."
+ *
+ * https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSPR/Reference/PR_ImportTCPSocket
+ *
+ * The function is declared in <private/pprio.h>, but as it is a header marked
+ * private we declare it here rather than including it.
+ */
+NSPR_API(PRFileDesc *) PR_ImportTCPSocket(int);
+
+static SECMODModule * ca_trust = NULL;
+static NSSInitContext * nss_context = NULL;
+
+/*
+ * This logic exist in NSS as well, but it's only available for when there is
+ * a database to open, and not only using the system trust store. Thus, we
+ * need to keep our own copy.
+ */
+#if defined(WIN32)
+static const char *ca_trust_name = "nssckbi.dll";
+#elif defined(__darwin__)
+static const char *ca_trust_name = "libnssckbi.dylib";
+#else
+static const char *ca_trust_name = "libnssckbi.so";
+#endif
+
+static PQsslKeyPassHook_nss_type PQsslKeyPassHook = NULL;
+
+/* ------------------------------------------------------------ */
+/*			 Procedures common to all secure sessions			*/
+/* ------------------------------------------------------------ */
+
+/*
+ * pgtls_init_library
+ *
+ * There is no direct equivalent for PQinitOpenSSL in NSS/NSPR, with PR_Init
+ * being the closest match there is. PR_Init is however already documented to
+ * not be required so simply making this a noop seems like the best option.
+ */
+void
+pgtls_init_library(bool do_ssl, int do_crypto)
+{
+	/* noop */
+}
+
+int
+pgtls_init(PGconn *conn)
+{
+	conn->ssl_in_use = false;
+	conn->has_password = false;
+
+	return 0;
+}
+
+void
+pgtls_close(PGconn *conn)
+{
+	if (nss_context)
+	{
+		NSS_ShutdownContext(nss_context);
+		nss_context = NULL;
+	}
+}
+
+PostgresPollingStatusType
+pgtls_open_client(PGconn *conn)
+{
+	SECStatus	status;
+	PRFileDesc *pr_fd;
+	PRFileDesc *model;
+	NSSInitParameters params;
+	SSLVersionRange desired_range;
+
+	/*
+	 * The NSPR documentation states that runtime initialization via PR_Init
+	 * is no longer required, as the first caller into NSPR will perform the
+	 * initialization implicitly. See be-secure-nss.c for further discussion
+	 * on PR_Init.
+	 */
+	PR_Init(PR_USER_THREAD, PR_PRIORITY_NORMAL, 0);
+
+	/*
+	 * NSS initialization and the use of contexts is further discussed in
+	 * be-secure-nss.c
+	 */
+	memset(&params, 0, sizeof(params));
+	params.length = sizeof(params);
+
+	if (conn->cert_database && strlen(conn->cert_database) > 0)
+	{
+		char	   *cert_database_path = psprintf("sql:%s", conn->cert_database);
+
+		nss_context = NSS_InitContext(cert_database_path, "", "", "",
+									  &params,
+									  NSS_INIT_READONLY | NSS_INIT_PK11RELOAD);
+		pfree(cert_database_path);
+
+		if (!nss_context)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("unable to open certificate database \"%s\": %s"),
+							  conn->cert_database,
+							  pg_SSLerrmessage(PR_GetError()));
+			return PGRES_POLLING_FAILED;
+		}
+	}
+	else
+	{
+		nss_context = NSS_InitContext("", "", "", "", &params,
+									  NSS_INIT_READONLY | NSS_INIT_NOCERTDB |
+									  NSS_INIT_NOMODDB | NSS_INIT_FORCEOPEN |
+									  NSS_INIT_NOROOTINIT | NSS_INIT_PK11RELOAD);
+		if (!nss_context)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("unable to create certificate database: %s"),
+							  pg_SSLerrmessage(PR_GetError()));
+			return PGRES_POLLING_FAILED;
+		}
+	}
+
+	/*
+	 * Configure cipher policy.
+	 */
+	status = NSS_SetDomesticPolicy();
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to configure cipher policy: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * If we don't have a certificate database, the system trust store is the
+	 * fallback we can use. If we fail to initialize that as well, we can
+	 * still attempt a connection as long as the sslmode isn't verify*.
+	 */
+	if (!conn->cert_database && conn->sslmode[0] == 'v')
+	{
+		status = pg_load_nss_module(&ca_trust, ca_trust_name, "\"Root Certificates\"");
+		if (status != SECSuccess)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("WARNING: unable to load NSS trust module \"%s\" : %s"),
+							  ca_trust_name,
+							  pg_SSLerrmessage(PR_GetError()));
+
+			return PGRES_POLLING_FAILED;
+		}
+	}
+
+
+	PK11_SetPasswordFunc(PQssl_passwd_cb);
+
+	/*
+	 * Import the already opened socket as we don't want to use NSPR functions
+	 * for opening the network socket due to how the PostgreSQL protocol works
+	 * with TLS connections. This function is not part of the NSPR public API,
+	 * see the comment at the top of the file for the rationale of still using
+	 * it.
+	 */
+	pr_fd = PR_ImportTCPSocket(conn->sock);
+	if (!pr_fd)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to attach to socket: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * Most of the documentation available, and implementations of, NSS/NSPR
+	 * use the PR_NewTCPSocket() function here, which has the drawback that it
+	 * can only create IPv4 sockets. Instead use PR_OpenTCPSocket() which
+	 * copes with IPv6 as well.
+	 */
+	model = SSL_ImportFD(NULL, PR_OpenTCPSocket(conn->laddr.addr.ss_family));
+	if (!model)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to enable TLS: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/* Disable old protocol versions (SSLv2 and SSLv3) */
+	SSL_OptionSet(model, SSL_ENABLE_SSL2, PR_FALSE);
+	SSL_OptionSet(model, SSL_V2_COMPATIBLE_HELLO, PR_FALSE);
+	SSL_OptionSet(model, SSL_ENABLE_SSL3, PR_FALSE);
+
+#ifdef SSL_CBC_RANDOM_IV
+
+	/*
+	 * Enable protection against the BEAST attack in case the NSS library has
+	 * support for that. While SSLv3 is disabled, we may still allow TLSv1
+	 * which is affected. The option isn't documented as an SSL option, but as
+	 * an NSS environment variable.
+	 */
+	SSL_OptionSet(model, SSL_CBC_RANDOM_IV, PR_TRUE);
+#endif
+
+	/* Set us up as a TLS client for the handshake */
+	SSL_OptionSet(model, SSL_HANDSHAKE_AS_CLIENT, PR_TRUE);
+
+	/*
+	 * When setting the available protocols, we either use the user defined
+	 * configuration values, and if missing we accept whatever is the highest
+	 * version supported by the library as the max and only limit the range in
+	 * the other end at TLSv1.0. ssl_variant_stream is a ProtocolVariant enum
+	 * for Stream protocols, rather than datagram.
+	 */
+	SSL_VersionRangeGetSupported(ssl_variant_stream, &desired_range);
+	desired_range.min = SSL_LIBRARY_VERSION_TLS_1_0;
+
+	if (conn->ssl_min_protocol_version && strlen(conn->ssl_min_protocol_version) > 0)
+	{
+		int			ssl_min_ver = ssl_protocol_version_to_nss(conn->ssl_min_protocol_version);
+
+		if (ssl_min_ver == -1)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("invalid value \"%s\" for minimum version of SSL protocol\n"),
+							  conn->ssl_min_protocol_version);
+			return -1;
+		}
+
+		desired_range.min = ssl_min_ver;
+	}
+
+	if (conn->ssl_max_protocol_version && strlen(conn->ssl_max_protocol_version) > 0)
+	{
+		int			ssl_max_ver = ssl_protocol_version_to_nss(conn->ssl_max_protocol_version);
+
+		if (ssl_max_ver == -1)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("invalid value \"%s\" for maximum version of SSL protocol\n"),
+							  conn->ssl_max_protocol_version);
+			return -1;
+		}
+
+		desired_range.max = ssl_max_ver;
+	}
+
+	if (SSL_VersionRangeSet(model, &desired_range) != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to set allowed SSL protocol version range: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * Set up callback for verifying server certificates, as well as for how
+	 * to handle failed verifications.
+	 */
+	SSL_AuthCertificateHook(model, pg_cert_auth_handler, (void *) conn);
+	SSL_BadCertHook(model, pg_bad_cert_handler, (void *) conn);
+
+	/*
+	 * Convert the NSPR socket to an SSL socket. Ensuring the success of this
+	 * operation is critical as NSS SSL_* functions may return SECSuccess on
+	 * the socket even though SSL hasn't been enabled, which introduce a risk
+	 * of silent downgrades.
+	 */
+	conn->pr_fd = SSL_ImportFD(model, pr_fd);
+	if (!conn->pr_fd)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to configure client for TLS: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * The model can now we closed as we've applied the settings of the model
+	 * onto the real socket. From hereon we should only use conn->pr_fd.
+	 */
+	PR_Close(model);
+
+	/* Set the private data to be passed to the password callback */
+	SSL_SetPKCS11PinArg(conn->pr_fd, (void *) conn);
+
+	/*
+	 * If a CRL file has been specified, verify if it exists in the database
+	 * but don't fail in case it doesn't.
+	 */
+	if (conn->sslcrl && strlen(conn->sslcrl) > 0)
+	{
+		/* XXX: Implement me.. */
+	}
+
+	status = SSL_ResetHandshake(conn->pr_fd, PR_FALSE);
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to initiate handshake: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * Set callback for client authentication when requested by the server.
+	 */
+	SSL_GetClientAuthDataHook(conn->pr_fd, pg_client_auth_handler, (void *) conn);
+
+	/*
+	 * Specify which hostname we are expecting to talk to. This is required,
+	 * albeit mostly applies to when opening a connection to a traditional
+	 * http server it seems.
+	 */
+	SSL_SetURL(conn->pr_fd, (conn->connhost[conn->whichhost]).host);
+
+	do
+	{
+		status = SSL_ForceHandshake(conn->pr_fd);
+	}
+	while (status != SECSuccess && PR_GetError() == PR_WOULD_BLOCK_ERROR);
+
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("SSL error: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	conn->ssl_in_use = true;
+	return PGRES_POLLING_OK;
+}
+
+ssize_t
+pgtls_read(PGconn *conn, void *ptr, size_t len)
+{
+	PRInt32		nread;
+	PRErrorCode status;
+	int			read_errno = 0;
+
+	/*
+	 * PR_Recv blocks until there is data to read or the timeout expires. We
+	 * don't want to sit blocked here, so the timeout is turned off by using
+	 * PR_INTERVAL_NO_WAIT which means "return immediately",  Zero is returned
+	 * for closed connections, while -1 indicates an error within the ongoing
+	 * connection.
+	 */
+	nread = PR_Recv(conn->pr_fd, ptr, len, 0, PR_INTERVAL_NO_WAIT);
+
+	if (nread == 0)
+	{
+		read_errno = ECONNRESET;
+		nread = -1;
+	}
+	else if (nread == -1)
+	{
+		status = PR_GetError();
+
+		switch (status)
+		{
+			case PR_IO_TIMEOUT_ERROR:
+				/* No data available yet. */
+				nread = 0;
+				break;
+
+			case PR_WOULD_BLOCK_ERROR:
+				read_errno = EWOULDBLOCK;
+				break;
+
+				/*
+				 * The error cases for PR_Recv are not documented, but can be
+				 * reverse engineered from _MD_unix_map_default_error() in the
+				 * NSPR code, defined in pr/src/md/unix/unix_errors.c.
+				 */
+			case PR_NETWORK_UNREACHABLE_ERROR:
+			case PR_CONNECT_RESET_ERROR:
+				read_errno = ECONNRESET;
+				break;
+
+			default:
+				break;
+		}
+
+		if (nread == -1)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("TLS read error: %s"),
+							  pg_SSLerrmessage(status));
+		}
+	}
+
+	SOCK_ERRNO_SET(read_errno);
+	return (ssize_t) nread;
+}
+
+/*
+ * pgtls_read_pending
+ *		Check for the existence of data to be read.
+ *
+ * This is part of the PostgreSQL TLS backend API.
+ */
+bool
+pgtls_read_pending(PGconn *conn)
+{
+	unsigned char c;
+	int			n;
+
+	/*
+	 * PR_Recv peeks into the stream with the timeount turned off, to see if
+	 * there is another byte to read off the wire. There is an NSS function
+	 * SSL_DataPending() which might seem like a better fit, but it will only
+	 * check already encrypted data in the SSL buffer, not still unencrypted
+	 * data, thus it doesn't guarantee that a subsequent call to
+	 * PR_Read/PR_Recv won't block.
+	 */
+	n = PR_Recv(conn->pr_fd, &c, 1, PR_MSG_PEEK, PR_INTERVAL_NO_WAIT);
+	return (n > 0);
+}
+
+ssize_t
+pgtls_write(PGconn *conn, const void *ptr, size_t len)
+{
+	PRInt32		n;
+	PRErrorCode status;
+	int			write_errno = 0;
+
+	n = PR_Write(conn->pr_fd, ptr, len);
+
+	if (n < 0)
+	{
+		status = PR_GetError();
+
+		switch (status)
+		{
+			case PR_WOULD_BLOCK_ERROR:
+#ifdef EAGAIN
+				write_errno = EAGAIN;
+#else
+				write_errno = EINTR;
+#endif
+				break;
+
+			default:
+				printfPQExpBuffer(&conn->errorMessage,
+								  libpq_gettext("TLS write error: %s"),
+								  pg_SSLerrmessage(status));
+				write_errno = ECONNRESET;
+				break;
+		}
+	}
+
+	SOCK_ERRNO_SET(write_errno);
+	return (ssize_t) n;
+}
+
+char *
+pgtls_get_peer_certificate_hash(PGconn *conn, size_t *len)
+{
+	CERTCertificate *server_cert;
+	SECOidTag	signature_alg;
+	SECOidTag	digest_alg;
+	int			digest_len;
+	const NSSSignatureAlgorithms *candidate;
+	PLArenaPool *arena;
+	SECItem		digest;
+	char	   *ret;
+	SECStatus	status;
+
+	*len = 0;
+
+	server_cert = SSL_PeerCertificate(conn->pr_fd);
+	if (!server_cert)
+		return NULL;
+
+	signature_alg = SECOID_GetAlgorithmTag(&server_cert->signature);
+
+	candidate = NSS_SCRAMDigestAlgorithm;
+	while (candidate->signature)
+	{
+		if (signature_alg == candidate->signature)
+		{
+			digest_alg = candidate->hash;
+			digest_len = candidate->len;
+			break;
+		}
+
+		candidate++;
+	}
+
+	if (!candidate->signature)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("could not find digest for OID '%s'\n"),
+						  SECOID_FindOIDTagDescription(signature_alg));
+		return NULL;
+	}
+
+	arena = PORT_NewArena(SEC_ASN1_DEFAULT_ARENA_SIZE);
+	digest.data = PORT_ArenaZAlloc(arena, sizeof(unsigned char) * digest_len);
+	digest.len = digest_len;
+
+	status = PK11_HashBuf(digest_alg, digest.data, server_cert->derCert.data,
+						  server_cert->derCert.len);
+
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to generate peer certificate digest: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		PORT_FreeArena(arena, PR_TRUE);
+		return NULL;
+	}
+
+	ret = pg_malloc(digest.len);
+	memcpy(ret, digest.data, digest.len);
+	*len = digest_len;
+	PORT_FreeArena(arena, PR_TRUE);
+
+	return ret;
+}
+
+/*
+ *	Verify that the server certificate matches the hostname we connected to.
+ *
+ * The certificate's Common Name and Subject Alternative Names are considered.
+ */
+int
+pgtls_verify_peer_name_matches_certificate_guts(PGconn *conn,
+												int *names_examined,
+												char **first_name)
+{
+	char	   *server_hostname = NULL;
+	CERTCertificate *server_cert = NULL;
+	SECStatus	status = SECSuccess;
+	SECItem		altname_item;
+	PLArenaPool *arena = NULL;
+	CERTGeneralName *san_list;
+	CERTGeneralName *cn;
+
+	server_hostname = SSL_RevealURL(conn->pr_fd);
+	if (!server_hostname || server_hostname[0] == '\0')
+		goto done;
+
+	/*
+	 * CERT_VerifyCertName will internally perform RFC 2818 SubjectAltName
+	 * verification.
+	 */
+	server_cert = SSL_PeerCertificate(conn->pr_fd);
+	status = CERT_VerifyCertName(server_cert, server_hostname);
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to verify server hostname: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		goto done;
+	}
+
+	status = CERT_FindCertExtension(server_cert, SEC_OID_X509_SUBJECT_ALT_NAME,
+									&altname_item);
+	if (status == SECSuccess)
+	{
+		arena = PORT_NewArena(DER_DEFAULT_CHUNKSIZE);
+		if (!arena)
+		{
+			status = SECFailure;
+			goto done;
+		}
+		san_list = CERT_DecodeAltNameExtension(arena, &altname_item);
+		if (!san_list)
+		{
+			status = SECFailure;
+			goto done;
+		}
+
+		for (cn = san_list; cn != san_list; cn = CERT_GetNextGeneralName(cn))
+		{
+			char	   *alt_name;
+			int			rv;
+			char		tmp[512];
+
+			status = CERT_RFC1485_EscapeAndQuote(tmp, sizeof(tmp),
+												 (char *) cn->name.other.data,
+												 cn->name.other.len);
+
+			if (status != SECSuccess)
+				goto done;
+
+			rv = pq_verify_peer_name_matches_certificate_name(conn, tmp,
+															  strlen(tmp),
+															  &alt_name);
+			if (alt_name)
+			{
+				if (!*first_name)
+					*first_name = alt_name;
+				else
+					free(alt_name);
+			}
+
+			if (rv == 1)
+				status = SECSuccess;
+			else
+			{
+				status = SECFailure;
+				break;
+			}
+		}
+	}
+	else if (PORT_GetError() == SEC_ERROR_EXTENSION_NOT_FOUND)
+		status = SECSuccess;
+	else
+		status = SECSuccess;
+
+done:
+	/* san_list will be freed by freeing the arena it was allocated in */
+	if (arena)
+		PORT_FreeArena(arena, PR_TRUE);
+	PR_Free(server_hostname);
+
+	if (status == SECSuccess)
+		return 1;
+
+	return 0;
+}
+
+/* ------------------------------------------------------------ */
+/*			PostgreSQL specific TLS support functions			*/
+/* ------------------------------------------------------------ */
+
+static const char *
+pg_SSLerrmessage(PRErrorCode errcode)
+{
+	const char *error;
+
+	/*
+	 * Try to get the user friendly error description, and if that fails try
+	 * to fall back on the name of the PRErrorCode.
+	 */
+	error = PR_ErrorToString(errcode, PR_LANGUAGE_I_DEFAULT);
+	if (!error)
+		error = PR_ErrorToName(errcode);
+	if (error)
+		return error;
+
+	return "unknown TLS error";
+}
+
+static SECStatus
+pg_load_nss_module(SECMODModule * *module, const char *library, const char *name)
+{
+	SECMODModule *mod;
+	char	   *modulespec;
+
+	modulespec = psprintf("library=\"%s\", name=\"%s\"", library, name);
+
+	/*
+	 * Attempt to load the specified module. The second parameter is "parent"
+	 * which should always be NULL for application code. The third parameter
+	 * defines if loading should recurse which is only applicable when loading
+	 * a module from within another module. This hierarchy would have to be
+	 * defined in the modulespec, and since we don't support anything but
+	 * directly addressed modules we should pass PR_FALSE.
+	 */
+	mod = SECMOD_LoadUserModule(modulespec, NULL, PR_FALSE);
+	pfree(modulespec);
+
+	if (mod && mod->loaded)
+	{
+		*module = mod;
+		return SECSuccess;
+	}
+
+	SECMOD_DestroyModule(mod);
+	return SECFailure;
+}
+
+/* ------------------------------------------------------------ */
+/*						NSS Callbacks							*/
+/* ------------------------------------------------------------ */
+
+/*
+ * pg_cert_auth_handler
+ *			Callback for authenticating server certificate
+ *
+ * This is pretty much the same procedure as the SSL_AuthCertificate function
+ * provided by NSS, with the difference being server hostname validation. With
+ * SSL_AuthCertificate there is no way to do verify-ca, it only does the -full
+ * flavor of our sslmodes, so we need our own implementation.
+ */
+static SECStatus
+pg_cert_auth_handler(void *arg, PRFileDesc *fd, PRBool checksig, PRBool isServer)
+{
+	SECStatus	status;
+	PGconn	   *conn = (PGconn *) arg;
+	CERTCertificate *server_cert;
+	void	   *pin;
+
+	Assert(!isServer);
+
+	pin = SSL_RevealPinArg(conn->pr_fd);
+	server_cert = SSL_PeerCertificate(conn->pr_fd);
+
+	status = CERT_VerifyCertificateNow((CERTCertDBHandle *) CERT_GetDefaultCertDB(),
+									   server_cert,
+									   checksig,
+									   certificateUsageSSLServer,
+									   pin,
+									   NULL);
+
+	/*
+	 * If we've already failed validation then there is no point in also
+	 * performing the hostname check for verify-full.
+	 */
+	if (status == SECSuccess)
+	{
+		if (!pq_verify_peer_name_matches_certificate(conn))
+			status = SECFailure;
+	}
+	else
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to verify certificate: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+	}
+
+	return status;
+}
+
+/*
+ * pg_client_auth_handler
+ *		Callback for client certificate validation
+ *
+ * The client auth callback is not on by default in NSS, so we need to invoke
+ * it ourselves to ensure we can do cert authentication. A TODO is to support
+ * running without a specified sslcert parameter. By retrieving all the certs
+ * via nickname from the cert database and see if we find one which apply with
+ * NSS_CmpCertChainWCANames() and PK11_FindKeyByAnyCert() we could support
+ * just running with a ssl database specified.
+ *
+ * For now, we use the default client certificate validation which requires a
+ * defined nickname to identify the cert in the database.
+ */
+static SECStatus
+pg_client_auth_handler(void *arg, PRFileDesc * socket, CERTDistNames * caNames,
+					   CERTCertificate * *pRetCert, SECKEYPrivateKey * *pRetKey)
+{
+	PGconn	   *conn = (PGconn *) arg;
+
+	return NSS_GetClientAuthData(conn->sslcert, socket, caNames, pRetCert, pRetKey);
+}
+
+/*
+ * pg_bad_cert_handler
+ *		Callback for failed certificate validation
+ *
+ * The TLS handshake will call this function iff the server certificate failed
+ * validation. Depending on the sslmode, we allow the connection anyways.
+ */
+static SECStatus
+pg_bad_cert_handler(void *arg, PRFileDesc * fd)
+{
+	PGconn	   *conn = (PGconn *) arg;
+	PRErrorCode err;
+
+	/*
+	 * This really shouldn't happen, as we've set the PGconn object as our
+	 * callback data, and at the callsite we know it will be populated. That
+	 * being said, the NSS code itself performs this check even when it should
+	 * not be required so let's use the same belts with our suspenders.
+	 */
+	if (!arg)
+		return SECFailure;
+
+	/*
+	 * For sslmodes other than verify-full and verify-ca we don't perform peer
+	 * validation, so return immediately.  sslmode require with a database
+	 * specified which contains a CA certificate will work like verify-ca to
+	 * be compatible with the OpenSSL implementation.
+	 */
+	if (strcmp(conn->sslmode, "require") == 0)
+	{
+		if (conn->cert_database && strlen(conn->cert_database) > 0 && cert_database_has_CA(conn))
+			return SECFailure;
+	}
+	if (conn->sslmode[0] == 'v')
+		return SECFailure;
+
+	err = PORT_GetError();
+
+	/*
+	 * TODO: these are relevant error codes that can occur in certificate
+	 * validation, figure out which we don't want for require/prefer etc.
+	 */
+	switch (err)
+	{
+		case SEC_ERROR_INVALID_AVA:
+		case SEC_ERROR_INVALID_TIME:
+		case SEC_ERROR_BAD_SIGNATURE:
+		case SEC_ERROR_EXPIRED_CERTIFICATE:
+		case SEC_ERROR_UNKNOWN_ISSUER:
+		case SEC_ERROR_UNTRUSTED_ISSUER:
+		case SEC_ERROR_UNTRUSTED_CERT:
+		case SEC_ERROR_CERT_VALID:
+		case SEC_ERROR_EXPIRED_ISSUER_CERTIFICATE:
+		case SEC_ERROR_CRL_EXPIRED:
+		case SEC_ERROR_CRL_BAD_SIGNATURE:
+		case SEC_ERROR_EXTENSION_VALUE_INVALID:
+		case SEC_ERROR_CA_CERT_INVALID:
+		case SEC_ERROR_CERT_USAGES_INVALID:
+		case SEC_ERROR_UNKNOWN_CRITICAL_EXTENSION:
+			return SECSuccess;
+			break;
+		default:
+			return SECFailure;
+			break;
+	}
+
+	/* Unreachable */
+	return SECSuccess;
+}
+
+/* ------------------------------------------------------------ */
+/*					SSL information functions					*/
+/* ------------------------------------------------------------ */
+
+/*
+ * PQgetssl
+ *
+ * Return NULL as this is legacy and defined to always be equal to calling
+ * PQsslStruct(conn, "OpenSSL"); This should ideally trigger a logged warning
+ * somewhere as it's nonsensical to run in a non-OpenSSL build, but the color
+ * of said bikeshed hasn't yet been determined.
+ */
+void *
+PQgetssl(PGconn *conn)
+{
+	return NULL;
+}
+
+void *
+PQsslStruct(PGconn *conn, const char *struct_name)
+{
+	if (!conn)
+		return NULL;
+
+	/*
+	 * Return the underlying PRFileDesc which can be used to access
+	 * information on the connection details. There is no SSL context per se.
+	 */
+	if (strcmp(struct_name, "NSS") == 0)
+		return conn->pr_fd;
+	return NULL;
+}
+
+const char *const *
+PQsslAttributeNames(PGconn *conn)
+{
+	static const char *const result[] = {
+		"library",
+		"cipher",
+		"protocol",
+		"key_bits",
+		"compression",
+		NULL
+	};
+
+	return result;
+}
+
+const char *
+PQsslAttribute(PGconn *conn, const char *attribute_name)
+{
+	SECStatus	status;
+	SSLChannelInfo channel;
+	SSLCipherSuiteInfo suite;
+
+	if (!conn || !conn->pr_fd)
+		return NULL;
+
+	if (strcmp(attribute_name, "library") == 0)
+		return "NSS";
+
+	status = SSL_GetChannelInfo(conn->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+		return NULL;
+
+	status = SSL_GetCipherSuiteInfo(channel.cipherSuite, &suite, sizeof(suite));
+	if (status != SECSuccess)
+		return NULL;
+
+	if (strcmp(attribute_name, "cipher") == 0)
+		return suite.cipherSuiteName;
+
+	if (strcmp(attribute_name, "key_bits") == 0)
+	{
+		static char key_bits_str[8];
+
+		snprintf(key_bits_str, sizeof(key_bits_str), "%i", suite.effectiveKeyBits);
+		return key_bits_str;
+	}
+
+	if (strcmp(attribute_name, "protocol") == 0)
+	{
+		switch (channel.protocolVersion)
+		{
+#ifdef SSL_LIBRARY_VERSION_TLS_1_3
+			case SSL_LIBRARY_VERSION_TLS_1_3:
+				return "TLSv1.3";
+#endif
+#ifdef SSL_LIBRARY_VERSION_TLS_1_2
+			case SSL_LIBRARY_VERSION_TLS_1_2:
+				return "TLSv1.2";
+#endif
+#ifdef SSL_LIBRARY_VERSION_TLS_1_1
+			case SSL_LIBRARY_VERSION_TLS_1_1:
+				return "TLSv1.1";
+#endif
+			case SSL_LIBRARY_VERSION_TLS_1_0:
+				return "TLSv1.0";
+			default:
+				return "unknown";
+		}
+	}
+
+	/*
+	 * NSS disabled support for compression in version 3.33, and it was only
+	 * available for SSLv3 at that point anyways, so we can safely return off
+	 * here without checking.
+	 */
+	if (strcmp(attribute_name, "compression") == 0)
+		return "off";
+
+	return NULL;
+}
+
+static int
+ssl_protocol_version_to_nss(const char *protocol)
+{
+	if (pg_strcasecmp("TLSv1", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_0;
+
+#ifdef SSL_LIBRARY_VERSION_TLS_1_1
+	if (pg_strcasecmp("TLSv1.1", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_1;
+#endif
+
+#ifdef SSL_LIBRARY_VERSION_TLS_1_2
+	if (pg_strcasecmp("TLSv1.2", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_2;
+#endif
+
+#ifdef SSL_LIBRARY_VERSION_TLS_1_3
+	if (pg_strcasecmp("TLSv1.3", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_3;
+#endif
+
+	return -1;
+}
+
+/*
+ * cert_database_has_CA
+ *
+ * Returns true in case there is a CA certificate in the database connected
+ * to in the conn object, else false. This function only checks for the
+ * presence of a CA certificate, not it's validity and/or usefulness.
+ */
+static bool
+cert_database_has_CA(PGconn *conn)
+{
+	CERTCertList *certificates;
+	bool		hasCA;
+
+	/*
+	 * If the certificate database has a password we must provide it, since
+	 * this API doesn't invoke the standard password callback.
+	 */
+	if (conn->has_password)
+		certificates = PK11_ListCerts(PK11CertListCA, PQssl_passwd_cb(NULL, PR_FALSE, (void *) conn));
+	else
+		certificates = PK11_ListCerts(PK11CertListCA, NULL);
+	hasCA = !CERT_LIST_EMPTY(certificates);
+	CERT_DestroyCertList(certificates);
+
+	return hasCA;
+}
+
+PQsslKeyPassHook_nss_type
+PQgetSSLKeyPassHook_nss(void)
+{
+	return PQsslKeyPassHook;
+}
+
+void
+PQsetSSLKeyPassHook_nss(PQsslKeyPassHook_nss_type hook)
+{
+	PQsslKeyPassHook = hook;
+}
+
+/*
+ * Supply a password to decrypt a client certificate.
+ *
+ * This must match NSS type PK11PasswordFunc.
+ */
+static char *
+PQssl_passwd_cb(PK11SlotInfo *slot, PRBool retry, void *arg)
+{
+	PGconn	   *conn = (PGconn *) arg;
+
+	conn->has_password = true;
+
+	if (PQsslKeyPassHook)
+		return PQsslKeyPassHook(slot, (PRBool) retry, arg);
+	else
+		return PQdefaultSSLKeyPassHook_nss(slot, retry, arg);
+}
+
+/*
+ * The default password handler callback.
+ */
+char *
+PQdefaultSSLKeyPassHook_nss(PK11SlotInfo * slot, PRBool retry, void *arg)
+{
+	PGconn	   *conn = (PGconn *) arg;
+
+	/*
+	 * If the password didn't work the first time there is no point in
+	 * retrying as it hasn't changed.
+	 */
+	if (retry != PR_TRUE && conn->sslpassword && strlen(conn->sslpassword) > 0)
+		return PORT_Strdup(conn->sslpassword);
+
+	return NULL;
+}
diff --git a/src/interfaces/libpq/fe-secure.c b/src/interfaces/libpq/fe-secure.c
index 00b87bdc96..44385ee391 100644
--- a/src/interfaces/libpq/fe-secure.c
+++ b/src/interfaces/libpq/fe-secure.c
@@ -421,6 +421,9 @@ PQsslAttributeNames(PGconn *conn)
 
 	return result;
 }
+#endif							/* USE_SSL */
+
+#ifndef USE_OPENSSL
 
 PQsslKeyPassHook_OpenSSL_type
 PQgetSSLKeyPassHook_OpenSSL(void)
@@ -439,7 +442,7 @@ PQdefaultSSLKeyPassHook_OpenSSL(char *buf, int size, PGconn *conn)
 {
 	return 0;
 }
-#endif							/* USE_SSL */
+#endif							/* USE_OPENSSL */
 
 /* Dummy version of GSSAPI information functions, when built without GSS support */
 #ifndef ENABLE_GSS
diff --git a/src/interfaces/libpq/libpq-fe.h b/src/interfaces/libpq/libpq-fe.h
index c266ad5b13..aba32e6635 100644
--- a/src/interfaces/libpq/libpq-fe.h
+++ b/src/interfaces/libpq/libpq-fe.h
@@ -619,12 +619,23 @@ extern int	pg_valid_server_encoding_id(int encoding);
 
 /* === in fe-secure-openssl.c === */
 
-/* Support for overriding sslpassword handling with a callback. */
+/* Support for overriding sslpassword handling with a callback */
 typedef int (*PQsslKeyPassHook_OpenSSL_type) (char *buf, int size, PGconn *conn);
 extern PQsslKeyPassHook_OpenSSL_type PQgetSSLKeyPassHook_OpenSSL(void);
 extern void PQsetSSLKeyPassHook_OpenSSL(PQsslKeyPassHook_OpenSSL_type hook);
 extern int	PQdefaultSSLKeyPassHook_OpenSSL(char *buf, int size, PGconn *conn);
 
+/* == in fe-secure-nss.c === */
+typedef struct PK11SlotInfoStr PK11SlotInfo;
+typedef int PRIntn;
+typedef PRIntn PRBool;
+
+/* Support for overriding sslpassword handling with a callback */
+typedef char *(*PQsslKeyPassHook_nss_type) (PK11SlotInfo *slot, PRBool retry, void *arg);
+extern PQsslKeyPassHook_nss_type PQgetSSLKeyPassHook_nss(void);
+extern void PQsetSSLKeyPassHook_nss(PQsslKeyPassHook_nss_type hook);
+extern char *PQdefaultSSLKeyPassHook_nss(PK11SlotInfo *slot, PRBool retry, void *arg);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/src/interfaces/libpq/libpq-int.h b/src/interfaces/libpq/libpq-int.h
index 4db498369c..a95450fbba 100644
--- a/src/interfaces/libpq/libpq-int.h
+++ b/src/interfaces/libpq/libpq-int.h
@@ -362,6 +362,7 @@ struct pg_conn
 	char	   *sslpassword;	/* client key file password */
 	char	   *sslrootcert;	/* root certificate filename */
 	char	   *sslcrl;			/* certificate revocation list filename */
+	char	   *cert_database;	/* NSS certificate/key database */
 	char	   *requirepeer;	/* required peer credentials for local sockets */
 	char	   *gssencmode;		/* GSS mode (require,prefer,disable) */
 	char	   *krbsrvname;		/* Kerberos service name */
@@ -485,6 +486,23 @@ struct pg_conn
 								 * OpenSSL version changes */
 #endif
 #endif							/* USE_OPENSSL */
+
+#ifdef USE_NSS
+	void	   *pr_fd;			/* NSPR file descriptor for the connection */
+
+	/*
+	 * Track whether the NSS database has a password set or not. There is no
+	 * API function for retrieving password status of a database, but we need
+	 * to know since some NSS API calls require the password passed in (they
+	 * don't call the callback themselves). To track, we simply flip this to
+	 * true in case NSS invoked the password callback - as that will only
+	 * happen in case there is a password. The reason for tracking this is
+	 * that there are calls which require a password parameter, but doesn't
+	 * use the callbacks provided, so we must call the callback on behalf of
+	 * these.
+	 */
+	bool		has_password;
+#endif							/* USE_NSS */
 #endif							/* USE_SSL */
 
 #ifdef ENABLE_GSS
@@ -759,7 +777,7 @@ extern ssize_t pgtls_write(PGconn *conn, const void *ptr, size_t len);
  * This is not supported with old versions of OpenSSL that don't have
  * the X509_get_signature_nid() function.
  */
-#if defined(USE_OPENSSL) && defined(HAVE_X509_GET_SIGNATURE_NID)
+#if defined(USE_NSS) || (defined(USE_OPENSSL) && defined(HAVE_X509_GET_SIGNATURE_NID))
 #define HAVE_PGTLS_GET_PEER_CERTIFICATE_HASH
 extern char *pgtls_get_peer_certificate_hash(PGconn *conn, size_t *len);
 #endif
diff --git a/src/tools/msvc/Mkvcbuild.pm b/src/tools/msvc/Mkvcbuild.pm
index 90328db04e..ff01acf3f6 100644
--- a/src/tools/msvc/Mkvcbuild.pm
+++ b/src/tools/msvc/Mkvcbuild.pm
@@ -195,12 +195,19 @@ sub mkvcbuild
 	$postgres->FullExportDLL('postgres.lib');
 
 	# The OBJS scraper doesn't know about ifdefs, so remove appropriate files
-	# if building without OpenSSL.
-	if (!$solution->{options}->{openssl})
+	# if building without various options.
+	if (!$solution->{options}->{openssl} && !$solution->{options}->{nss})
 	{
 		$postgres->RemoveFile('src/backend/libpq/be-secure-common.c');
+	}
+	if (!$solution->{options}->{openssl})
+	{
 		$postgres->RemoveFile('src/backend/libpq/be-secure-openssl.c');
 	}
+	if (!$solution->{options}->{nss})
+	{
+		$postgres->RemoveFile('src/backend/libpq/be-secure-nss.c');
+	}
 	if (!$solution->{options}->{gss})
 	{
 		$postgres->RemoveFile('src/backend/libpq/be-gssapi-common.c');
@@ -258,12 +265,19 @@ sub mkvcbuild
 	$libpq->AddReference($libpgcommon, $libpgport);
 
 	# The OBJS scraper doesn't know about ifdefs, so remove appropriate files
-	# if building without OpenSSL.
-	if (!$solution->{options}->{openssl})
+	# if building without various options
+	if (!$solution->{options}->{openssl} && !$solution->{options}->{nss})
 	{
 		$libpq->RemoveFile('src/interfaces/libpq/fe-secure-common.c');
+	}
+	if (!$solution->{options}->{openssl})
+	{
 		$libpq->RemoveFile('src/interfaces/libpq/fe-secure-openssl.c');
 	}
+	if (!$solution->{options}->{nss})
+	{
+		$libpq->RemoveFile('src/interfaces/libpq/fe-secure-nss.c');
+	}
 	if (!$solution->{options}->{gss})
 	{
 		$libpq->RemoveFile('src/interfaces/libpq/fe-gssapi-common.c');
diff --git a/src/tools/msvc/Solution.pm b/src/tools/msvc/Solution.pm
index 2f28de0355..aece3edfc8 100644
--- a/src/tools/msvc/Solution.pm
+++ b/src/tools/msvc/Solution.pm
@@ -488,6 +488,7 @@ sub GenerateFiles
 		USE_LLVM                   => undef,
 		USE_NAMED_POSIX_SEMAPHORES => undef,
 		USE_OPENSSL                => undef,
+		USE_NSS                    => undef,
 		USE_PAM                    => undef,
 		USE_SLICING_BY_8_CRC32C    => undef,
 		USE_SSE42_CRC32C           => undef,
@@ -540,6 +541,10 @@ sub GenerateFiles
 			$define{HAVE_OPENSSL_INIT_SSL}      = 1;
 		}
 	}
+	if ($self->{options}->{nss})
+	{
+		$define{USE_NSS} = 1;
+	}
 
 	$self->GenerateConfigHeader('src/include/pg_config.h',     \%define, 1);
 	$self->GenerateConfigHeader('src/include/pg_config_ext.h', \%define, 0);
@@ -1005,6 +1010,21 @@ sub AddProject
 			}
 		}
 	}
+	if ($self->{options}->{nss})
+	{
+		$proj->AddIncludeDir($self->{options}->{nss} . '\..\public\nss');
+		$proj->AddIncludeDir($self->{options}->{nss} . '\include\nspr');
+		foreach my $lib (qw(plds4 plc4 nspr4))
+		{
+			$proj->AddLibrary($self->{options}->{nss} .
+							  '\lib\lib' . "$lib.lib", 0);
+		}
+		foreach my $lib (qw(ssl3 smime3 nss3))
+		{
+			$proj->AddLibrary($self->{options}->{nss} .
+							  '\lib' . "\\$lib.dll.lib", 0);
+		}
+	}
 	if ($self->{options}->{nls})
 	{
 		$proj->AddIncludeDir($self->{options}->{nls} . '\include');
diff --git a/src/tools/msvc/config_default.pl b/src/tools/msvc/config_default.pl
index 2ef2cfc4e9..49dc4d5864 100644
--- a/src/tools/msvc/config_default.pl
+++ b/src/tools/msvc/config_default.pl
@@ -17,6 +17,7 @@ our $config = {
 	perl      => undef,    # --with-perl=<path>
 	python    => undef,    # --with-python=<path>
 	openssl   => undef,    # --with-openssl=<path>
+	nss       => undef,    # --with-nss=<path>
 	uuid      => undef,    # --with-uuid=<path>
 	xml       => undef,    # --with-libxml=<path>
 	xslt      => undef,    # --with-libxslt=<path>
-- 
2.21.1 (Apple Git-122.3)

From b319d0be8ddbda4a4e0e3600521da83240bd6e73 Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Wed, 27 Jan 2021 14:41:05 +0100
Subject: [PATCH v23 1/8] Introduce --with-ssl

---
 configure                                     | 110 +++++++++++-------
 configure.ac                                  |  31 +++--
 contrib/Makefile                              |   2 +-
 contrib/pgcrypto/Makefile                     |   4 +-
 src/Makefile.global.in                        |   2 +-
 src/backend/libpq/Makefile                    |   2 +-
 src/common/Makefile                           |   2 +-
 src/interfaces/libpq/Makefile                 |   8 +-
 src/test/Makefile                             |   2 +-
 src/test/modules/Makefile                     |   2 +-
 .../modules/ssl_passphrase_callback/Makefile  |   2 +-
 .../ssl_passphrase_callback/t/001_testfunc.pl |   4 +-
 src/test/ssl/Makefile                         |   2 +-
 13 files changed, 108 insertions(+), 65 deletions(-)

diff --git a/configure b/configure
index e202697bbf..ce9ea36999 100755
--- a/configure
+++ b/configure
@@ -653,6 +653,7 @@ LIBOBJS
 UUID_LIBS
 LDAP_LIBS_BE
 LDAP_LIBS_FE
+with_ssl
 PTHREAD_CFLAGS
 PTHREAD_LIBS
 PTHREAD_CC
@@ -709,7 +710,6 @@ with_uuid
 with_readline
 with_systemd
 with_selinux
-with_openssl
 with_ldap
 with_krb_srvnam
 krb_srvtab
@@ -854,7 +854,6 @@ with_pam
 with_bsd_auth
 with_ldap
 with_bonjour
-with_openssl
 with_selinux
 with_systemd
 with_readline
@@ -866,6 +865,8 @@ with_libxslt
 with_system_tzdata
 with_zlib
 with_gnu_ld
+with_ssl
+with_openssl
 enable_largefile
 '
       ac_precious_vars='build_alias
@@ -1556,7 +1557,6 @@ Optional Packages:
   --with-bsd-auth         build with BSD Authentication support
   --with-ldap             build with LDAP support
   --with-bonjour          build with Bonjour support
-  --with-openssl          build with OpenSSL support
   --with-selinux          build with SELinux support
   --with-systemd          build with systemd support
   --without-readline      do not use GNU Readline nor BSD Libedit for editing
@@ -1570,6 +1570,8 @@ Optional Packages:
                           use system time zone data in DIR
   --without-zlib          do not use Zlib
   --with-gnu-ld           assume the C compiler uses GNU ld [default=no]
+  --with-ssl=LIB          use LIB for SSL/TLS support (openssl)
+  --with-openssl          obsolete spelling of --with-ssl=openssl
 
 Some influential environment variables:
   CC          C compiler command
@@ -8070,41 +8072,6 @@ fi
 $as_echo "$with_bonjour" >&6; }
 
 
-#
-# OpenSSL
-#
-{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether to build with OpenSSL support" >&5
-$as_echo_n "checking whether to build with OpenSSL support... " >&6; }
-
-
-
-# Check whether --with-openssl was given.
-if test "${with_openssl+set}" = set; then :
-  withval=$with_openssl;
-  case $withval in
-    yes)
-
-$as_echo "#define USE_OPENSSL 1" >>confdefs.h
-
-      ;;
-    no)
-      :
-      ;;
-    *)
-      as_fn_error $? "no argument expected for --with-openssl option" "$LINENO" 5
-      ;;
-  esac
-
-else
-  with_openssl=no
-
-fi
-
-
-{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $with_openssl" >&5
-$as_echo "$with_openssl" >&6; }
-
-
 #
 # SELinux
 #
@@ -12174,7 +12141,64 @@ fi
   fi
 fi
 
+#
+# SSL Library
+#
+# There is currently only one supported SSL/TLS library: OpenSSL.
+#
+
+
+
+# Check whether --with-ssl was given.
+if test "${with_ssl+set}" = set; then :
+  withval=$with_ssl;
+  case $withval in
+    yes)
+      as_fn_error $? "argument required for --with-ssl option" "$LINENO" 5
+      ;;
+    no)
+      as_fn_error $? "argument required for --with-ssl option" "$LINENO" 5
+      ;;
+    *)
+
+      ;;
+  esac
+
+fi
+
+
+if test x"$with_ssl" = x"" ; then
+  with_ssl=no
+fi
+
+
+
+# Check whether --with-openssl was given.
+if test "${with_openssl+set}" = set; then :
+  withval=$with_openssl;
+  case $withval in
+    yes)
+      :
+      ;;
+    no)
+      :
+      ;;
+    *)
+      as_fn_error $? "no argument expected for --with-openssl option" "$LINENO" 5
+      ;;
+  esac
+
+else
+  with_openssl=no
+
+fi
+
+
 if test "$with_openssl" = yes ; then
+  with_ssl=openssl
+fi
+
+if test "$with_ssl" = openssl ; then
     # Minimum required OpenSSL version is 1.0.1
 
 $as_echo "#define OPENSSL_API_COMPAT 0x10001000L" >>confdefs.h
@@ -12435,8 +12459,14 @@ _ACEOF
 fi
 done
 
+
+$as_echo "#define USE_OPENSSL 1" >>confdefs.h
+
+elif test "$with_ssl" != no ; then
+  as_fn_error $? "--with-ssl must specify openssl" "$LINENO" 5
 fi
 
+
 if test "$with_pam" = yes ; then
   { $as_echo "$as_me:${as_lineno-$LINENO}: checking for pam_start in -lpam" >&5
 $as_echo_n "checking for pam_start in -lpam... " >&6; }
@@ -13322,7 +13352,7 @@ done
 
 fi
 
-if test "$with_openssl" = yes ; then
+if test "$with_ssl" = openssl ; then
   ac_fn_c_check_header_mongrel "$LINENO" "openssl/ssl.h" "ac_cv_header_openssl_ssl_h" "$ac_includes_default"
 if test "x$ac_cv_header_openssl_ssl_h" = xyes; then :
 
@@ -18098,7 +18128,7 @@ fi
 # will be used.
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking which random number source to use" >&5
 $as_echo_n "checking which random number source to use... " >&6; }
-if test x"$with_openssl" = x"yes" ; then
+if test x"$with_ssl" = x"openssl" ; then
   { $as_echo "$as_me:${as_lineno-$LINENO}: result: OpenSSL" >&5
 $as_echo "OpenSSL" >&6; }
 elif test x"$PORTNAME" = x"win32" ; then
diff --git a/configure.ac b/configure.ac
index a5ad072ee4..07da84d401 100644
--- a/configure.ac
+++ b/configure.ac
@@ -852,15 +852,6 @@ PGAC_ARG_BOOL(with, bonjour, no,
 AC_MSG_RESULT([$with_bonjour])
 
 
-#
-# OpenSSL
-#
-AC_MSG_CHECKING([whether to build with OpenSSL support])
-PGAC_ARG_BOOL(with, openssl, no, [build with OpenSSL support],
-              [AC_DEFINE([USE_OPENSSL], 1, [Define to build with OpenSSL support. (--with-openssl)])])
-AC_MSG_RESULT([$with_openssl])
-AC_SUBST(with_openssl)
-
 #
 # SELinux
 #
@@ -1205,7 +1196,21 @@ if test "$with_gssapi" = yes ; then
   fi
 fi
 
+#
+# SSL Library
+#
+# There is currently only one supported SSL/TLS library: OpenSSL.
+#
+PGAC_ARG_REQ(with, ssl, [LIB], [use LIB for SSL/TLS support (openssl)])
+if test x"$with_ssl" = x"" ; then
+  with_ssl=no
+fi
+PGAC_ARG_BOOL(with, openssl, no, [obsolete spelling of --with-ssl=openssl])
 if test "$with_openssl" = yes ; then
+  with_ssl=openssl
+fi
+
+if test "$with_ssl" = openssl ; then
   dnl Order matters!
   # Minimum required OpenSSL version is 1.0.1
   AC_DEFINE(OPENSSL_API_COMPAT, [0x10001000L],
@@ -1229,7 +1234,11 @@ if test "$with_openssl" = yes ; then
   # thread-safety. In 1.1.0, it's no longer required, and CRYPTO_lock()
   # function was removed.
   AC_CHECK_FUNCS([CRYPTO_lock])
+  AC_DEFINE([USE_OPENSSL], 1, [Define to 1 if you have OpenSSL support.])
+elif test "$with_ssl" != no ; then
+  AC_MSG_ERROR([--with-ssl must specify openssl])
 fi
+AC_SUBST(with_ssl)
 
 if test "$with_pam" = yes ; then
   AC_CHECK_LIB(pam,    pam_start, [], [AC_MSG_ERROR([library 'pam' is required for PAM])])
@@ -1402,7 +1411,7 @@ if test "$with_gssapi" = yes ; then
 	[AC_CHECK_HEADERS(gssapi.h, [], [AC_MSG_ERROR([gssapi.h header file is required for GSSAPI])])])
 fi
 
-if test "$with_openssl" = yes ; then
+if test "$with_ssl" = openssl ; then
   AC_CHECK_HEADER(openssl/ssl.h, [], [AC_MSG_ERROR([header file <openssl/ssl.h> is required for OpenSSL])])
   AC_CHECK_HEADER(openssl/err.h, [], [AC_MSG_ERROR([header file <openssl/err.h> is required for OpenSSL])])
 fi
@@ -2159,7 +2168,7 @@ fi
 # first choice, else the native platform sources (Windows API or /dev/urandom)
 # will be used.
 AC_MSG_CHECKING([which random number source to use])
-if test x"$with_openssl" = x"yes" ; then
+if test x"$with_ssl" = x"openssl" ; then
   AC_MSG_RESULT([OpenSSL])
 elif test x"$PORTNAME" = x"win32" ; then
   AC_MSG_RESULT([Windows native])
diff --git a/contrib/Makefile b/contrib/Makefile
index cdc041c7db..ba414fe581 100644
--- a/contrib/Makefile
+++ b/contrib/Makefile
@@ -51,7 +51,7 @@ SUBDIRS = \
 		unaccent	\
 		vacuumlo
 
-ifeq ($(with_openssl),yes)
+ifneq ($(with_ssl),no)
 SUBDIRS += sslinfo
 else
 ALWAYS_SUBDIRS += sslinfo
diff --git a/contrib/pgcrypto/Makefile b/contrib/pgcrypto/Makefile
index 316a26e58d..3500bd4c72 100644
--- a/contrib/pgcrypto/Makefile
+++ b/contrib/pgcrypto/Makefile
@@ -10,8 +10,8 @@ OSSL_TESTS = sha2 des 3des cast5
 ZLIB_TST = pgp-compression
 ZLIB_OFF_TST = pgp-zlib-DISABLED
 
-CF_SRCS = $(if $(subst no,,$(with_openssl)), $(OSSL_SRCS), $(INT_SRCS))
-CF_TESTS = $(if $(subst no,,$(with_openssl)), $(OSSL_TESTS), $(INT_TESTS))
+CF_SRCS = $(if $(subst openssl,,$(with_ssl)), $(OSSL_SRCS), $(INT_SRCS))
+CF_TESTS = $(if $(subst openssl,,$(with_ssl)), $(OSSL_TESTS), $(INT_TESTS))
 CF_PGP_TESTS = $(if $(subst no,,$(with_zlib)), $(ZLIB_TST), $(ZLIB_OFF_TST))
 
 SRCS = \
diff --git a/src/Makefile.global.in b/src/Makefile.global.in
index 9a1688c97c..74b3a6acd2 100644
--- a/src/Makefile.global.in
+++ b/src/Makefile.global.in
@@ -183,7 +183,7 @@ with_icu	= @with_icu@
 with_perl	= @with_perl@
 with_python	= @with_python@
 with_tcl	= @with_tcl@
-with_openssl	= @with_openssl@
+with_ssl	= @with_ssl@
 with_readline	= @with_readline@
 with_selinux	= @with_selinux@
 with_systemd	= @with_systemd@
diff --git a/src/backend/libpq/Makefile b/src/backend/libpq/Makefile
index efc5ef760a..8d1d16b0fc 100644
--- a/src/backend/libpq/Makefile
+++ b/src/backend/libpq/Makefile
@@ -28,7 +28,7 @@ OBJS = \
 	pqmq.o \
 	pqsignal.o
 
-ifeq ($(with_openssl),yes)
+ifeq ($(with_ssl),openssl)
 OBJS += be-secure-openssl.o
 endif
 
diff --git a/src/common/Makefile b/src/common/Makefile
index 1a1d0d3406..5422579a6a 100644
--- a/src/common/Makefile
+++ b/src/common/Makefile
@@ -80,7 +80,7 @@ OBJS_COMMON = \
 	wait_error.o \
 	wchar.o
 
-ifeq ($(with_openssl),yes)
+ifeq ($(with_ssl),openssl)
 OBJS_COMMON += \
 	protocol_openssl.o \
 	cryptohash_openssl.o
diff --git a/src/interfaces/libpq/Makefile b/src/interfaces/libpq/Makefile
index c4fde3f93d..c5ef0bead5 100644
--- a/src/interfaces/libpq/Makefile
+++ b/src/interfaces/libpq/Makefile
@@ -45,9 +45,13 @@ OBJS = \
 	pqexpbuffer.o \
 	fe-auth.o
 
-ifeq ($(with_openssl),yes)
+ifneq ($(with_ssl),no)
+OBJS += \
+	fe-secure-common.o
+endif
+
+ifeq ($(with_ssl),openssl)
 OBJS += \
-	fe-secure-common.o \
 	fe-secure-openssl.o
 endif
 
diff --git a/src/test/Makefile b/src/test/Makefile
index ab1ef9a475..414749d627 100644
--- a/src/test/Makefile
+++ b/src/test/Makefile
@@ -28,7 +28,7 @@ ifneq (,$(filter ldap,$(PG_TEST_EXTRA)))
 SUBDIRS += ldap
 endif
 endif
-ifeq ($(with_openssl),yes)
+ifneq ($(with_ssl),no)
 ifneq (,$(filter ssl,$(PG_TEST_EXTRA)))
 SUBDIRS += ssl
 endif
diff --git a/src/test/modules/Makefile b/src/test/modules/Makefile
index 59921b46cf..5391f461a2 100644
--- a/src/test/modules/Makefile
+++ b/src/test/modules/Makefile
@@ -28,7 +28,7 @@ SUBDIRS = \
 		  unsafe_tests \
 		  worker_spi
 
-ifeq ($(with_openssl),yes)
+ifeq ($(with_ssl),openssl)
 SUBDIRS += ssl_passphrase_callback
 else
 ALWAYS_SUBDIRS += ssl_passphrase_callback
diff --git a/src/test/modules/ssl_passphrase_callback/Makefile b/src/test/modules/ssl_passphrase_callback/Makefile
index f81265c296..a34d7ea46a 100644
--- a/src/test/modules/ssl_passphrase_callback/Makefile
+++ b/src/test/modules/ssl_passphrase_callback/Makefile
@@ -1,6 +1,6 @@
 # ssl_passphrase_callback Makefile
 
-export with_openssl
+export with_ssl
 
 MODULE_big = ssl_passphrase_func
 OBJS = ssl_passphrase_func.o $(WIN32RES)
diff --git a/src/test/modules/ssl_passphrase_callback/t/001_testfunc.pl b/src/test/modules/ssl_passphrase_callback/t/001_testfunc.pl
index dbc084f870..c7bff75f07 100644
--- a/src/test/modules/ssl_passphrase_callback/t/001_testfunc.pl
+++ b/src/test/modules/ssl_passphrase_callback/t/001_testfunc.pl
@@ -7,9 +7,9 @@ use TestLib;
 use Test::More;
 use PostgresNode;
 
-unless (($ENV{with_openssl} || 'no') eq 'yes')
+if ($ENV{with_ssl} eq 'no')
 {
-	plan skip_all => 'SSL not supported by this build';
+	plan skip_all => 'OpenSSL not supported by this build';
 }
 
 my $clearpass = "FooBaR1";
diff --git a/src/test/ssl/Makefile b/src/test/ssl/Makefile
index 93335b1ea2..d545382eea 100644
--- a/src/test/ssl/Makefile
+++ b/src/test/ssl/Makefile
@@ -13,7 +13,7 @@ subdir = src/test/ssl
 top_builddir = ../../..
 include $(top_builddir)/src/Makefile.global
 
-export with_openssl
+export with_ssl
 
 CERTIFICATES := server_ca server-cn-and-alt-names \
 	server-cn-only server-single-alt-name server-multiple-alt-names \
-- 
2.21.1 (Apple Git-122.3)

From 3155eba6b39fe583a764271359ef326e66cadd1a Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Mon, 18 Jan 2021 13:04:49 +0100
Subject: [PATCH v24 6/6] NSS cryptohash support

---
 src/common/cryptohash_nss.c | 255 ++++++++++++++++++++++++++++++++++++
 src/tools/msvc/Mkvcbuild.pm |   4 +
 2 files changed, 259 insertions(+)
 create mode 100644 src/common/cryptohash_nss.c

diff --git a/src/common/cryptohash_nss.c b/src/common/cryptohash_nss.c
new file mode 100644
index 0000000000..3e2b5776c1
--- /dev/null
+++ b/src/common/cryptohash_nss.c
@@ -0,0 +1,255 @@
+/*-------------------------------------------------------------------------
+ *
+ * cryptohash_nss.c
+ *	  Set of wrapper routines on top of NSS to support cryptographic
+ *	  hash functions.
+ *
+ * This should only be used if code is compiled with NSS support.
+ *
+ * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ *		  src/common/cryptohash_nss.c
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#ifndef FRONTEND
+#include "postgres.h"
+#else
+#include "postgres_fe.h"
+#endif
+
+/*
+ * BITS_PER_BYTE is also defined in the NSPR header files, so we need to undef
+ * our version to avoid compiler warnings on redefinition.
+ */
+#define pg_BITS_PER_BYTE BITS_PER_BYTE
+#undef BITS_PER_BYTE
+
+#include <nss/nss.h>
+#include <nss/hasht.h>
+#include <nss/pk11func.h>
+#include <nss/pk11pub.h>
+#include <nss/secitem.h>
+#include <nss/sechash.h>
+#include <nss/secoid.h>
+#include <nss/secerr.h>
+
+/*
+ * Ensure that the colliding definitions match, else throw an error. In case
+ * NSPR has removed the definition for some reason, make sure to put ours
+ * back again.
+ */
+#if defined(BITS_PER_BYTE)
+#if BITS_PER_BYTE != pg_BITS_PER_BYTE
+#error "incompatible byte widths between NSPR and postgres"
+#endif
+#else
+#define BITS_PER_BYTE pg_BITS_PER_BYTE
+#endif
+#undef pg_BITS_PER_BYTE
+
+#include "common/cryptohash.h"
+#ifndef FRONTEND
+#include "utils/memutils.h"
+#include "utils/resowner.h"
+#include "utils/resowner_private.h"
+#endif
+
+/*
+ * In the backend, use an allocation in TopMemoryContext to count for
+ * resowner cleanup handling.  In the frontend, use malloc to be able
+ * to return a failure status back to the caller.
+ */
+#ifndef FRONTEND
+#define ALLOC(size) MemoryContextAlloc(TopMemoryContext, size)
+#define FREE(ptr) pfree(ptr)
+#else
+#define ALLOC(size) malloc(size)
+#define FREE(ptr) free(ptr)
+#endif
+
+/*
+ * Internal pg_cryptohash_ctx structure.
+ */
+struct pg_cryptohash_ctx
+{
+	pg_cryptohash_type type;
+
+	PK11Context *pk11_context;
+	HASH_HashType hash_type;
+
+#ifndef FRONTEND
+	ResourceOwner resowner;
+#endif
+};
+
+/*
+ * pg_cryptohash_create
+ *
+ * Create and allocate a new hash context. Returns NULL on failure in the
+ * frontend, and raise error without returning in the backend.
+ */
+pg_cryptohash_ctx *
+pg_cryptohash_create(pg_cryptohash_type type)
+{
+	NSSInitParameters params;
+	pg_cryptohash_ctx *ctx;
+	SECOidData *hash;
+	SECStatus status;
+
+#ifndef FRONTEND
+	/*
+	 * Make sure that the resource owner has space to remember this reference.
+	 * This can error out with "out of memory", so do this before any other
+	 * allocation to avoid leaking.
+	 */
+	ResourceOwnerEnlargeCryptoHash(CurrentResourceOwner);
+#endif
+
+	ctx = ALLOC(sizeof(pg_cryptohash_ctx));
+
+	if (!ctx)
+		goto error;
+
+	switch(type)
+	{
+		case PG_SHA1:
+			ctx->hash_type = SEC_OID_SHA1;
+			break;
+		case PG_MD5:
+			ctx->hash_type = SEC_OID_MD5;
+			break;
+		case PG_SHA224:
+			ctx->hash_type = SEC_OID_SHA224;
+			break;
+		case PG_SHA256:
+			ctx->hash_type = SEC_OID_SHA256;
+			break;
+		case PG_SHA384:
+			ctx->hash_type = SEC_OID_SHA384;
+			break;
+		case PG_SHA512:
+			ctx->hash_type = SEC_OID_SHA512;
+			break;
+	}
+
+	/*
+	 * Initialize our own NSS context without a database backing it.
+	 */
+	memset(&params, 0, sizeof(params));
+	params.length = sizeof(params);
+	status = NSS_NoDB_Init(".");
+	if (status != SECSuccess)
+	{
+		explicit_bzero(ctx, sizeof(pg_cryptohash_ctx));
+		FREE(ctx);
+		goto error;
+	}
+
+	ctx->type = type;
+	hash = SECOID_FindOIDByTag(ctx->hash_type);
+	ctx->pk11_context = PK11_CreateDigestContext(hash->offset);
+	if (!ctx->pk11_context)
+	{
+		explicit_bzero(ctx, sizeof(pg_cryptohash_ctx));
+		FREE(ctx);
+		goto error;
+	}
+
+#ifndef FRONTEND
+	ctx->resowner = CurrentResourceOwner;
+	ResourceOwnerRememberCryptoHash(CurrentResourceOwner,
+									PointerGetDatum(ctx));
+#endif
+
+	return ctx;
+
+error:
+#ifndef FRONTEND
+	ereport(ERROR,
+			(errcode(ERRCODE_OUT_OF_MEMORY),
+			 errmsg("out of memory")));
+#endif
+	return NULL;
+}
+
+/*
+ * pg_cryptohash_init
+ *			Initialize the passed hash context
+ *
+ * Returns 0 on success, -1 on failure.
+ */
+int
+pg_cryptohash_init(pg_cryptohash_ctx *ctx)
+{
+	SECStatus		status;
+
+	status = PK11_DigestBegin(ctx->pk11_context);
+
+	if (status != SECSuccess)
+		return -1;
+	return 0;
+}
+
+/*
+ * pg_cryptohash_update
+ *
+ * Update a hash context.  Returns 0 on success, -1 on failure.
+ */
+int
+pg_cryptohash_update(pg_cryptohash_ctx *ctx, const uint8 *data, size_t len)
+{
+	SECStatus	status;
+
+	if (ctx == NULL)
+		return -1;
+
+	status = PK11_DigestOp(ctx->pk11_context, data, len);
+	if (status != SECSuccess)
+		return -1;
+
+	return 0;
+}
+
+/*
+ * pg_cryptohash_final
+ *
+ * Finalize a hash context.  Returns 0 on success, -1 on failure.
+ */
+int
+pg_cryptohash_final(pg_cryptohash_ctx *ctx, uint8 *dest)
+{
+	SECStatus	status;
+	unsigned int outlen;
+	const SECHashObject *object;
+
+	object = HASH_GetHashObject(ctx->hash_type);
+	status = PK11_DigestFinal(ctx->pk11_context, dest, &outlen, object->length);
+
+	if (status != SECSuccess)
+		return -1;
+	return 0;
+}
+
+/*
+ * pg_cryptohash_free
+ *
+ * Free a hash context and the associated NSS context.
+ */
+void
+pg_cryptohash_free(pg_cryptohash_ctx *ctx)
+{
+	PRBool		free_context = PR_TRUE;
+	if (!ctx)
+		return;
+
+	PK11_DestroyContext(ctx->pk11_context, free_context);
+#ifndef FRONTEND
+	ResourceOwnerForgetCryptoHash(ctx->resowner, PointerGetDatum(ctx));
+#endif
+	explicit_bzero(ctx, sizeof(pg_cryptohash_ctx));
+	FREE(ctx);
+}
diff --git a/src/tools/msvc/Mkvcbuild.pm b/src/tools/msvc/Mkvcbuild.pm
index 660387d0e8..180eb0aa3f 100644
--- a/src/tools/msvc/Mkvcbuild.pm
+++ b/src/tools/msvc/Mkvcbuild.pm
@@ -132,6 +132,10 @@ sub mkvcbuild
 		push(@pgcommonallfiles, 'cryptohash_openssl.c');
 		push(@pgcommonallfiles, 'protocol_openssl.c');
 	}
+	elsif ($solution->{options}->{nss})
+	{
+		push(@pgcommonallfiles, 'cryptohash_nss.c');
+	}
 	else
 	{
 		push(@pgcommonallfiles, 'cryptohash.c');
-- 
2.21.1 (Apple Git-122.3)

From 216441c0910fa9728b9b458ec2fb7ab5645882bb Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Wed, 28 Oct 2020 11:34:37 +0100
Subject: [PATCH v24 5/6] NSS contrib modules

---
 contrib/pgcrypto/Makefile   |   7 +-
 contrib/pgcrypto/nss.c      | 773 ++++++++++++++++++++++++++++++++++++
 contrib/sslinfo/sslinfo.c   |  32 ++
 doc/src/sgml/pgcrypto.sgml  |  38 +-
 doc/src/sgml/sslinfo.sgml   |  12 +-
 src/tools/msvc/Install.pm   |   3 +-
 src/tools/msvc/Mkvcbuild.pm |  12 +-
 7 files changed, 863 insertions(+), 14 deletions(-)
 create mode 100644 contrib/pgcrypto/nss.c

diff --git a/contrib/pgcrypto/Makefile b/contrib/pgcrypto/Makefile
index c0b4f1fcf6..ede7a78146 100644
--- a/contrib/pgcrypto/Makefile
+++ b/contrib/pgcrypto/Makefile
@@ -7,11 +7,14 @@ INT_TESTS = sha2
 OSSL_SRCS = openssl.c pgp-mpi-openssl.c
 OSSL_TESTS = sha2 des 3des cast5
 
+NSS_SRCS = nss.c pgp-mpi-internal.c imath.c blf.c
+NSS_TESTS = sha2 des 3des
+
 ZLIB_TST = pgp-compression
 ZLIB_OFF_TST = pgp-zlib-DISABLED
 
-CF_SRCS = $(if $(subst openssl,,$(with_ssl)), $(INT_SRCS), $(OSSL_SRCS))
-CF_TESTS = $(if $(subst openssl,,$(with_ssl)), $(INT_TESTS), $(OSSL_TESTS))
+CF_SRCS = $(if $(findstring openssl, $(with_ssl)), $(OSSL_SRCS), $(if $(findstring nss, $(with_ssl)), $(NSS_SRCS), $(INT_SRCS)))
+CF_TESTS = $(if $(findstring openssl, $(with_ssl)), $(OSSL_TESTS), $(if $(findstring nss, $(with_ssl)), $(NSS_TESTS), $(INT_TESTS)))
 CF_PGP_TESTS = $(if $(subst no,,$(with_zlib)), $(ZLIB_TST), $(ZLIB_OFF_TST))
 
 SRCS = \
diff --git a/contrib/pgcrypto/nss.c b/contrib/pgcrypto/nss.c
new file mode 100644
index 0000000000..da66152d65
--- /dev/null
+++ b/contrib/pgcrypto/nss.c
@@ -0,0 +1,773 @@
+/*-------------------------------------------------------------------------
+ *
+ * nss.c
+ *	  Wrapper for using NSS as a backend for pgcrypto PX
+ *
+ *
+ * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ *	  contrib/pgcrypto/nss.c
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#include "postgres.h"
+
+#include "px.h"
+#include "blf.h"
+#include "utils/memutils.h"
+
+/*
+ * BITS_PER_BYTE is also defined in the NSPR header files, so we need to undef
+ * our version to avoid compiler warnings on redefinition.
+ */
+#define pg_BITS_PER_BYTE BITS_PER_BYTE
+#undef BITS_PER_BYTE
+
+#include <nss/nss.h>
+#include <nss/hasht.h>
+#include <nss/pk11func.h>
+#include <nss/pk11pub.h>
+#include <nss/secitem.h>
+#include <nss/sechash.h>
+#include <nss/secoid.h>
+#include <nss/secerr.h>
+
+/*
+ * Ensure that the colliding definitions match, else throw an error. In case
+ * NSPR has removed the definition for some reason, make sure to put ours
+ * back again.
+ */
+#if defined(BITS_PER_BYTE)
+#if BITS_PER_BYTE != pg_BITS_PER_BYTE
+#error "incompatible byte widths between NSPR and postgres"
+#endif
+#else
+#define BITS_PER_BYTE pg_BITS_PER_BYTE
+#endif
+#undef pg_BITS_PER_BYTE
+
+/*
+ * Define our own mechanisms for Blowfish as it's not implemented by NSS.
+ */
+#define BLOWFISH_CBC	(1)
+#define BLOWFISH_ECB	(2)
+
+/*
+ * Data structures for recording cipher implementations as well as ongoing
+ * cipher operations.
+ */
+typedef struct nss_digest
+{
+	NSSInitContext *context;
+	PK11Context *hash_context;
+	HASH_HashType hash_type;
+}			nss_digest;
+
+typedef struct cipher_implementation
+{
+	/* Function pointers to cipher operations */
+	int			(*init) (PX_Cipher *pxc, const uint8 *key, unsigned klen, const uint8 *iv);
+	unsigned	(*get_block_size) (PX_Cipher *pxc);
+	unsigned	(*get_key_size) (PX_Cipher *pxc);
+	unsigned	(*get_iv_size) (PX_Cipher *pxc);
+	int			(*encrypt) (PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res);
+	int			(*decrypt) (PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res);
+	void		(*free) (PX_Cipher *pxc);
+
+	/* The mechanism describing the cipher used */
+	union
+	{
+		CK_MECHANISM_TYPE nss;
+		CK_ULONG	internal;
+	}			mechanism;
+	int			keylen;
+	bool		is_nss;
+}			cipher_implementation;
+
+typedef struct nss_cipher
+{
+	const cipher_implementation *impl;
+	NSSInitContext *context;
+	PK11Context *crypt_context;
+	SECItem    *params;
+
+	PK11SymKey *encrypt_key;
+	PK11SymKey *decrypt_key;
+}			nss_cipher;
+
+typedef struct internal_cipher
+{
+	const cipher_implementation *impl;
+	BlowfishContext context;
+}			internal_cipher;
+
+typedef struct nss_cipher_ref
+{
+	const char *name;
+	const cipher_implementation *impl;
+}			nss_cipher_ref;
+
+/*
+ * Prototypes
+ */
+static unsigned nss_get_iv_size(PX_Cipher *pxc);
+static unsigned nss_get_block_size(PX_Cipher *pxc);
+
+/*
+ * nss_GetHashOidTagByHashType
+ *
+ * Returns the corresponding SECOidTag for the passed hash type. NSS 3.43
+ * includes HASH_GetHashOidTagByHashType for this purpose, but at the time of
+ * writing is not commonly available so we need our own version till then.
+ */
+static SECOidTag
+nss_GetHashOidTagByHashType(HASH_HashType type)
+{
+	if (type == HASH_AlgMD2)
+		return SEC_OID_MD2;
+	if (type == HASH_AlgMD5)
+		return SEC_OID_MD5;
+	if (type == HASH_AlgSHA1)
+		return SEC_OID_SHA1;
+	if (type == HASH_AlgSHA224)
+		return SEC_OID_SHA224;
+	if (type == HASH_AlgSHA256)
+		return SEC_OID_SHA256;
+	if (type == HASH_AlgSHA384)
+		return SEC_OID_SHA384;
+	if (type == HASH_AlgSHA512)
+		return SEC_OID_SHA512;
+
+	return SEC_OID_UNKNOWN;
+}
+
+static unsigned
+nss_digest_block_size(PX_MD *pxmd)
+{
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+	const SECHashObject *object;
+
+	object = HASH_GetHashObject(digest->hash_type);
+	return object->blocklength;
+}
+
+static unsigned
+nss_digest_result_size(PX_MD *pxmd)
+{
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+	const SECHashObject *object;
+
+	object = HASH_GetHashObject(digest->hash_type);
+	return object->length;
+}
+
+static void
+nss_digest_free(PX_MD *pxmd)
+{
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+	PRBool		free_ctx = PR_TRUE;
+
+	PK11_DestroyContext(digest->hash_context, free_ctx);
+	NSS_ShutdownContext(digest->context);
+}
+
+static void
+nss_digest_update(PX_MD *pxmd, const uint8 *data, unsigned dlen)
+{
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+
+	PK11_DigestOp(digest->hash_context, data, dlen);
+}
+
+static void
+nss_digest_reset(PX_MD *pxmd)
+{
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+
+	PK11_DigestBegin(digest->hash_context);
+}
+
+static void
+nss_digest_finish(PX_MD *pxmd, uint8 *dst)
+{
+	unsigned int outlen;
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+	const SECHashObject *object;
+
+	object = HASH_GetHashObject(digest->hash_type);
+	PK11_DigestFinal(digest->hash_context, dst, &outlen, object->length);
+}
+
+int
+px_find_digest(const char *name, PX_MD **res)
+{
+	PX_MD	   *pxmd;
+	NSSInitParameters params;
+	NSSInitContext *nss_context;
+	bool		found = false;
+	nss_digest *digest;
+	SECStatus	status;
+	SECOidData *hash;
+	HASH_HashType t;
+
+	/*
+	 * Initialize our own NSS context without a database backing it.
+	 */
+	memset(&params, 0, sizeof(params));
+	params.length = sizeof(params);
+	nss_context = NSS_InitContext("", "", "", "", &params,
+								  NSS_INIT_READONLY | NSS_INIT_NOCERTDB |
+								  NSS_INIT_NOMODDB | NSS_INIT_FORCEOPEN |
+								  NSS_INIT_NOROOTINIT | NSS_INIT_PK11RELOAD);
+
+	/*
+	 * There is no API function for looking up a digest algorithm from a name
+	 * string, but there is a publicly accessible array which can be scanned
+	 * for the name.
+	 */
+	for (t = HASH_AlgNULL + 1; t < HASH_AlgTOTAL; t++)
+	{
+		SECOidTag	hash_oid;
+		char	   *p;
+
+		hash_oid = nss_GetHashOidTagByHashType(t);
+
+		if (hash_oid == SEC_OID_UNKNOWN)
+			return PXE_NO_HASH;
+
+		hash = SECOID_FindOIDByTag(hash_oid);
+		if (pg_strcasecmp(hash->desc, name) == 0)
+		{
+			found = true;
+			break;
+		}
+
+		/*
+		 * NSS saves the algorithm names using SHA-xxx notation whereas
+		 * OpenSSL use SHAxxx. To make sure the user finds the requested
+		 * algorithm let's remove the dash and compare that spelling as well.
+		 */
+		if ((p = strchr(hash->desc, '-')) != NULL)
+		{
+			char		tmp[12];
+
+			memcpy(tmp, hash->desc, p - hash->desc);
+			memcpy(tmp + (p - hash->desc), p + 1, strlen(hash->desc) - (p - hash->desc) + 1);
+			if (pg_strcasecmp(tmp, name) == 0)
+			{
+				found = true;
+				break;
+			}
+		}
+	}
+
+	if (!found)
+		return PXE_NO_HASH;
+
+	digest = palloc(sizeof(*digest));
+
+	digest->context = nss_context;
+	digest->hash_context = PK11_CreateDigestContext(hash->offset);
+	digest->hash_type = t;
+	if (digest->hash_context == NULL)
+	{
+		pfree(digest);
+		return -1;
+	}
+
+	status = PK11_DigestBegin(digest->hash_context);
+	if (status != SECSuccess)
+	{
+		PK11_DestroyContext(digest->hash_context, PR_TRUE);
+		pfree(digest);
+		return -1;
+	}
+
+	pxmd = palloc(sizeof(*pxmd));
+	pxmd->result_size = nss_digest_result_size;
+	pxmd->block_size = nss_digest_block_size;
+	pxmd->reset = nss_digest_reset;
+	pxmd->update = nss_digest_update;
+	pxmd->finish = nss_digest_finish;
+	pxmd->free = nss_digest_free;
+	pxmd->p.ptr = (void *) digest;
+
+	*res = pxmd;
+
+	return 0;
+}
+
+static int
+bf_init(PX_Cipher *pxc, const uint8 *key, unsigned klen, const uint8 *iv)
+{
+	internal_cipher *cipher = (internal_cipher *) pxc->ptr;
+
+	blowfish_setkey(&cipher->context, key, klen);
+	if (iv)
+		blowfish_setiv(&cipher->context, iv);
+
+	return 0;
+}
+
+static int
+bf_encrypt(PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res)
+{
+	internal_cipher *cipher = (internal_cipher *) pxc->ptr;
+	uint8	   *buf;
+
+	if (dlen == 0)
+		return 0;
+
+	if (dlen & 7)
+		return PXE_NOTBLOCKSIZE;
+
+	buf = palloc(dlen);
+	memcpy(buf, data, dlen);
+
+	if (cipher->impl->mechanism.internal == BLOWFISH_ECB)
+		blowfish_encrypt_ecb(buf, dlen, &cipher->context);
+	else
+		blowfish_encrypt_cbc(buf, dlen, &cipher->context);
+
+	memcpy(res, buf, dlen);
+	pfree(buf);
+
+	return 0;
+}
+
+static int
+bf_decrypt(PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res)
+{
+	internal_cipher *cipher = (internal_cipher *) pxc->ptr;
+
+	if (dlen == 0)
+		return 0;
+
+	if (dlen & 7)
+		return PXE_NOTBLOCKSIZE;
+
+	memcpy(res, data, dlen);
+	if (cipher->impl->mechanism.internal == BLOWFISH_ECB)
+		blowfish_decrypt_ecb(res, dlen, &cipher->context);
+	else
+		blowfish_decrypt_cbc(res, dlen, &cipher->context);
+
+	return 0;
+}
+
+static void
+bf_free(PX_Cipher *pxc)
+{
+	internal_cipher *cipher = (internal_cipher *) pxc->ptr;
+
+	pfree(cipher);
+	pfree(pxc);
+}
+
+static int
+nss_symkey_blockcipher_init(PX_Cipher *pxc, const uint8 *key, unsigned klen,
+							const uint8 *iv)
+{
+	nss_cipher *cipher = (nss_cipher *) pxc->ptr;
+	SECItem		iv_item;
+	unsigned char *iv_item_data;
+	SECItem		key_item;
+	int			keylen;
+	PK11SlotInfo *slot;
+
+	if (cipher->impl->mechanism.nss == CKM_AES_CBC ||
+		cipher->impl->mechanism.nss == CKM_AES_ECB)
+	{
+		if (klen <= 128 / 8)
+			keylen = 128 / 8;
+		else if (klen <= 192 / 8)
+			keylen = 192 / 8;
+		else if (klen <= 256 / 8)
+			keylen = 256 / 8;
+		else
+			return PXE_CIPHER_INIT;
+	}
+	else
+		keylen = cipher->impl->keylen;
+
+	key_item.type = siBuffer;
+	key_item.data = (unsigned char *) key;
+	key_item.len = keylen;
+
+	/*
+	 * If hardware acceleration is configured in NSS one can theoretically get
+	 * a better slot by calling PK11_GetBestSlot() with the mechanism passed
+	 * to it. Unless there are complaints, using the simpler API will make
+	 * error handling easier though.
+	 */
+	slot = PK11_GetInternalSlot();
+	if (!slot)
+		return PXE_CIPHER_INIT;
+
+	/*
+	 * The key must be set up for the operation, and since we don't know at
+	 * this point whether we are asked to encrypt or decrypt we need to store
+	 * both versions.
+	 */
+	cipher->decrypt_key = PK11_ImportSymKey(slot, cipher->impl->mechanism.nss,
+											PK11_OriginUnwrap,
+											CKA_DECRYPT, &key_item,
+											NULL);
+	cipher->encrypt_key = PK11_ImportSymKey(slot, cipher->impl->mechanism.nss,
+											PK11_OriginUnwrap,
+											CKA_ENCRYPT, &key_item,
+											NULL);
+	PK11_FreeSlot(slot);
+
+	if (!cipher->decrypt_key || !cipher->encrypt_key)
+		return PXE_CIPHER_INIT;
+
+	if (iv)
+	{
+		iv_item.type = siBuffer;
+		iv_item.data = (unsigned char *) iv;
+		iv_item.len = nss_get_iv_size(pxc);
+	}
+	else
+	{
+		/*
+		 * The documentation states that either passing .data = 0; .len = 0;
+		 * in the iv_item, or NULL as iv_item, to PK11_ParamFromIV should be
+		 * done when IV is missing. That however leads to segfaults in the
+		 * library, the workaround that works in modern  library versions is
+		 * to pass in a keysized zeroed out IV.
+		 */
+		iv_item_data = palloc0(nss_get_iv_size(pxc));
+		iv_item.type = siBuffer;
+		iv_item.data = iv_item_data;
+		iv_item.len = nss_get_iv_size(pxc);
+	}
+
+	cipher->params = PK11_ParamFromIV(cipher->impl->mechanism.nss, &iv_item);
+
+	/* If we had to make a mock IV, free it once made into a param */
+	if (!iv)
+		pfree(iv_item_data);
+
+	if (cipher->params == NULL)
+		return PXE_CIPHER_INIT;
+
+	return 0;
+}
+
+static int
+nss_decrypt(PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res)
+{
+	nss_cipher *cipher = (nss_cipher *) pxc->ptr;
+	SECStatus	status;
+	int			outlen;
+
+	if (!cipher->crypt_context)
+	{
+		cipher->crypt_context =
+			PK11_CreateContextBySymKey(cipher->impl->mechanism.nss, CKA_DECRYPT,
+									   cipher->decrypt_key, cipher->params);
+	}
+
+	status = PK11_CipherOp(cipher->crypt_context, res, &outlen, dlen, data, dlen);
+	if (status != SECSuccess)
+		return PXE_DECRYPT_FAILED;
+
+	return 0;
+}
+
+static int
+nss_encrypt(PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res)
+{
+	nss_cipher *cipher = (nss_cipher *) pxc->ptr;
+	SECStatus	status;
+	int			outlen;
+
+	if (!cipher->crypt_context)
+	{
+		cipher->crypt_context =
+			PK11_CreateContextBySymKey(cipher->impl->mechanism.nss, CKA_ENCRYPT,
+									   cipher->decrypt_key, cipher->params);
+	}
+
+	status = PK11_CipherOp(cipher->crypt_context, res, &outlen, dlen, data, dlen);
+
+	if (status != SECSuccess)
+		return PXE_DECRYPT_FAILED;
+
+	return 0;
+}
+
+static void
+nss_free(PX_Cipher *pxc)
+{
+	nss_cipher *cipher = pxc->ptr;
+	PRBool		free_ctx = PR_TRUE;
+
+	PK11_FreeSymKey(cipher->encrypt_key);
+	PK11_FreeSymKey(cipher->decrypt_key);
+	PK11_DestroyContext(cipher->crypt_context, free_ctx);
+	NSS_ShutdownContext(cipher->context);
+	pfree(cipher);
+
+	pfree(pxc);
+}
+
+static unsigned
+nss_get_block_size(PX_Cipher *pxc)
+{
+	nss_cipher *cipher = pxc->ptr;
+
+	return PK11_GetBlockSize(cipher->impl->mechanism.nss, NULL);
+}
+
+static unsigned
+nss_get_key_size(PX_Cipher *pxc)
+{
+	nss_cipher *cipher = pxc->ptr;
+
+	return cipher->impl->keylen;
+}
+
+static unsigned
+nss_get_iv_size(PX_Cipher *pxc)
+{
+	nss_cipher *cipher = pxc->ptr;
+
+	return PK11_GetIVLength(cipher->impl->mechanism.nss);
+}
+
+static unsigned
+bf_get_block_size(PX_Cipher *pxc)
+{
+	return 8;
+}
+
+static unsigned
+bf_get_key_size(PX_Cipher *pxc)
+{
+	return 448 / 8;
+}
+
+static unsigned
+bf_get_iv_size(PX_Cipher *pxc)
+{
+	return 8;
+}
+
+/*
+ * Cipher Implementations
+ */
+static const cipher_implementation nss_des_cbc = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_DES_CBC,
+	.keylen = 8,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_des_ecb = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_DES_ECB,
+	.keylen = 8,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_des3_cbc = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_DES3_CBC,
+	.keylen = 24,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_des3_ecb = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_DES3_ECB,
+	.keylen = 24,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_aes_cbc = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_AES_CBC,
+	.keylen = 32,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_aes_ecb = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_AES_ECB,
+	.keylen = 32,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_bf_ecb = {
+	.init = bf_init,
+	.get_block_size = bf_get_block_size,
+	.get_key_size = bf_get_key_size,
+	.get_iv_size = bf_get_iv_size,
+	.encrypt = bf_encrypt,
+	.decrypt = bf_decrypt,
+	.free = bf_free,
+	.mechanism.internal = BLOWFISH_ECB,
+	.keylen = 56,
+	.is_nss = false
+};
+
+static const cipher_implementation nss_bf_cbc = {
+	.init = bf_init,
+	.get_block_size = bf_get_block_size,
+	.get_key_size = bf_get_key_size,
+	.get_iv_size = bf_get_iv_size,
+	.encrypt = bf_encrypt,
+	.decrypt = bf_decrypt,
+	.free = bf_free,
+	.mechanism.internal = BLOWFISH_CBC,
+	.keylen = 56,
+	.is_nss = false
+};
+
+/*
+ * Lookup table for finding the implementation based on a name. CAST5 as well
+ * as BLOWFISH are defined as cipher mechanisms in NSS but error out with
+ * SEC_ERROR_INVALID_ALGORITHM. Blowfish is implemented using the internal
+ * implementation while CAST5 isn't supported at all at this time,
+ */
+static const nss_cipher_ref nss_cipher_lookup[] = {
+	{"des", &nss_des_cbc},
+	{"des-cbc", &nss_des_cbc},
+	{"des-ecb", &nss_des_ecb},
+	{"des3-cbc", &nss_des3_cbc},
+	{"3des", &nss_des3_cbc},
+	{"3des-cbc", &nss_des3_cbc},
+	{"des3-ecb", &nss_des3_ecb},
+	{"3des-ecb", &nss_des3_ecb},
+	{"aes", &nss_aes_cbc},
+	{"aes-cbc", &nss_aes_cbc},
+	{"aes-ecb", &nss_aes_ecb},
+	{"rijndael", &nss_aes_cbc},
+	{"rijndael-cbc", &nss_aes_cbc},
+	{"rijndael-ecb", &nss_aes_ecb},
+	{"blowfish", &nss_bf_cbc},
+	{"blowfish-cbc", &nss_bf_cbc},
+	{"blowfish-ecb", &nss_bf_ecb},
+	{"bf", &nss_bf_cbc},
+	{"bf-cbc", &nss_bf_cbc},
+	{"bf-ecb", &nss_bf_ecb},
+	{NULL}
+};
+
+/*
+ * px_find_cipher
+ *
+ * Search for the requested cipher and see if there is support for it, and if
+ * so return an allocated object containing the playbook for how to encrypt
+ * and decrypt using the cipher.
+ */
+int
+px_find_cipher(const char *alias, PX_Cipher **res)
+{
+	const nss_cipher_ref *cipher_ref;
+	PX_Cipher  *px_cipher;
+	NSSInitParameters params;
+	NSSInitContext *nss_context;
+	nss_cipher *cipher;
+	internal_cipher *int_cipher;
+
+	for (cipher_ref = nss_cipher_lookup; cipher_ref->name; cipher_ref++)
+	{
+		if (strcmp(cipher_ref->name, alias) == 0)
+			break;
+	}
+
+	if (!cipher_ref->name)
+		return PXE_NO_CIPHER;
+
+	/*
+	 * Fill in the PX_Cipher to pass back to PX describing the operations to
+	 * perform in order to use the cipher.
+	 */
+	px_cipher = palloc(sizeof(*px_cipher));
+	px_cipher->block_size = cipher_ref->impl->get_block_size;
+	px_cipher->key_size = cipher_ref->impl->get_key_size;
+	px_cipher->iv_size = cipher_ref->impl->get_iv_size;
+	px_cipher->free = cipher_ref->impl->free;
+	px_cipher->init = cipher_ref->impl->init;
+	px_cipher->encrypt = cipher_ref->impl->encrypt;
+	px_cipher->decrypt = cipher_ref->impl->decrypt;
+
+	/*
+	 * Set the private data, which is different for NSS and internal ciphers
+	 */
+	if (cipher_ref->impl->is_nss)
+	{
+		/*
+		 * Initialize our own NSS context without a database backing it. At
+		 * some point we might want to allow users to use stored keys in the
+		 * database rather than passing them via SELECT encrypt(), and then
+		 * this need to be changed to open a user specified database.
+		 */
+		memset(&params, 0, sizeof(params));
+		params.length = sizeof(params);
+		nss_context = NSS_InitContext("", "", "", "", &params,
+									  NSS_INIT_READONLY | NSS_INIT_NOCERTDB |
+									  NSS_INIT_NOMODDB | NSS_INIT_FORCEOPEN |
+									  NSS_INIT_NOROOTINIT | NSS_INIT_PK11RELOAD);
+
+		/* nss_cipher is the private state struct for the operation */
+		cipher = palloc(sizeof(*cipher));
+		cipher->context = nss_context;
+		cipher->impl = cipher_ref->impl;
+		cipher->crypt_context = NULL;
+
+		px_cipher->ptr = cipher;
+	}
+	else
+	{
+		int_cipher = palloc0(sizeof(*int_cipher));
+
+		int_cipher->impl = cipher_ref->impl;
+		px_cipher->ptr = int_cipher;
+	}
+
+	*res = px_cipher;
+	return 0;
+}
diff --git a/contrib/sslinfo/sslinfo.c b/contrib/sslinfo/sslinfo.c
index 30cae0bb98..3aadd90aa6 100644
--- a/contrib/sslinfo/sslinfo.c
+++ b/contrib/sslinfo/sslinfo.c
@@ -9,9 +9,11 @@
 
 #include "postgres.h"
 
+#ifdef USE_OPENSSL
 #include <openssl/x509.h>
 #include <openssl/x509v3.h>
 #include <openssl/asn1.h>
+#endif
 
 #include "access/htup_details.h"
 #include "funcapi.h"
@@ -21,6 +23,7 @@
 
 PG_MODULE_MAGIC;
 
+#ifdef USE_OPENSSL
 static Datum X509_NAME_field_to_text(X509_NAME *name, text *fieldName);
 static Datum ASN1_STRING_to_text(ASN1_STRING *str);
 
@@ -31,6 +34,7 @@ typedef struct
 {
 	TupleDesc	tupdesc;
 } SSLExtensionInfoContext;
+#endif
 
 /*
  * Indicates whether current session uses SSL
@@ -131,6 +135,7 @@ ssl_client_serial(PG_FUNCTION_ARGS)
 }
 
 
+#ifdef USE_OPENSSL
 /*
  * Converts OpenSSL ASN1_STRING structure into text
  *
@@ -282,7 +287,23 @@ ssl_issuer_field(PG_FUNCTION_ARGS)
 	else
 		return result;
 }
+#endif							/* USE_OPENSSL */
 
+#ifdef USE_NSS
+PG_FUNCTION_INFO_V1(ssl_client_dn_field);
+Datum
+ssl_client_dn_field(PG_FUNCTION_ARGS)
+{
+	PG_RETURN_NULL();
+}
+
+PG_FUNCTION_INFO_V1(ssl_issuer_field);
+Datum
+ssl_issuer_field(PG_FUNCTION_ARGS)
+{
+	PG_RETURN_NULL();
+}
+#endif							/* USE_NSS */
 
 /*
  * Returns current client certificate subject as one string
@@ -338,6 +359,7 @@ ssl_issuer_dn(PG_FUNCTION_ARGS)
 }
 
 
+#ifdef USE_OPENSSL
 /*
  * Returns information about available SSL extensions.
  *
@@ -471,3 +493,13 @@ ssl_extension_info(PG_FUNCTION_ARGS)
 	/* All done */
 	SRF_RETURN_DONE(funcctx);
 }
+#endif							/* USE_OPENSSL */
+
+#ifdef USE_NSS
+PG_FUNCTION_INFO_V1(ssl_extension_info);
+Datum
+ssl_extension_info(PG_FUNCTION_ARGS)
+{
+	PG_RETURN_NULL();
+}
+#endif							/* USE_NSS */
diff --git a/doc/src/sgml/pgcrypto.sgml b/doc/src/sgml/pgcrypto.sgml
index b6bb23de0f..bf486f0c07 100644
--- a/doc/src/sgml/pgcrypto.sgml
+++ b/doc/src/sgml/pgcrypto.sgml
@@ -45,8 +45,9 @@ digest(data bytea, type text) returns bytea
     <literal>sha224</literal>, <literal>sha256</literal>,
     <literal>sha384</literal> and <literal>sha512</literal>.
     If <filename>pgcrypto</filename> was built with
-    <productname>OpenSSL</productname>, more algorithms are available, as
-    detailed in <xref linkend="pgcrypto-with-without-openssl"/>.
+    <productname>OpenSSL</productname> or <productname>NSS</productname>,
+    more algorithms are available, as
+    detailed in <xref linkend="pgcrypto-with-without-openssl-nss"/>.
    </para>
 
    <para>
@@ -764,7 +765,7 @@ pgp_sym_encrypt(data, psw, 'compress-algo=1, cipher-algo=aes256')
     Which cipher algorithm to use.
    </para>
 <literallayout>
-Values: bf, aes128, aes192, aes256 (OpenSSL-only: <literal>3des</literal>, <literal>cast5</literal>)
+Values: bf, aes128, aes192, aes256 (OpenSSL-only: <literal>3des</literal>, <literal>cast5</literal>; NSS-only: <literal>3des</literal>)
 Default: aes128
 Applies to: pgp_sym_encrypt, pgp_pub_encrypt
 </literallayout>
@@ -1153,8 +1154,8 @@ gen_random_uuid() returns uuid
    <para>
     <filename>pgcrypto</filename> configures itself according to the findings of the
     main PostgreSQL <literal>configure</literal> script.  The options that
-    affect it are <literal>--with-zlib</literal> and
-    <literal>--with-ssl=openssl</literal>.
+    affect it are <literal>--with-zlib</literal>,
+    <literal>--with-ssl=openssl</literal> and <literal>--with-ssl=nss</literal>.
    </para>
 
    <para>
@@ -1169,14 +1170,16 @@ gen_random_uuid() returns uuid
     BIGNUM functions.
    </para>
 
-   <table id="pgcrypto-with-without-openssl">
-    <title>Summary of Functionality with and without OpenSSL</title>
-    <tgroup cols="3">
+   <table id="pgcrypto-with-without-openssl-nss">
+    <title>Summary of Functionality with and without external cryptographic
+      library</title>
+    <tgroup cols="4">
      <thead>
       <row>
        <entry>Functionality</entry>
        <entry>Built-in</entry>
        <entry>With OpenSSL</entry>
+       <entry>With NSS</entry>
       </row>
      </thead>
      <tbody>
@@ -1184,51 +1187,67 @@ gen_random_uuid() returns uuid
        <entry>MD5</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>SHA1</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>SHA224/256/384/512</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>Other digest algorithms</entry>
        <entry>no</entry>
        <entry>yes (Note 1)</entry>
+       <entry>yes (Note 1)</entry>
       </row>
       <row>
        <entry>Blowfish</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>AES</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>DES/3DES/CAST5</entry>
        <entry>no</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
+      </row>
+      <row>
+       <entry>CAST5</entry>
+       <entry>no</entry>
+       <entry>yes</entry>
+       <entry>no</entry>
       </row>
       <row>
        <entry>Raw encryption</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>PGP Symmetric encryption</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>PGP Public-Key encryption</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
      </tbody>
     </tgroup>
@@ -1241,7 +1260,8 @@ gen_random_uuid() returns uuid
    <orderedlist>
     <listitem>
      <para>
-      Any digest algorithm <productname>OpenSSL</productname> supports
+      Any digest algorithm <productname>OpenSSL</productname> and
+      <productname>NSS</productname> supports
       is automatically picked up.
       This is not possible with ciphers, which need to be supported
       explicitly.
diff --git a/doc/src/sgml/sslinfo.sgml b/doc/src/sgml/sslinfo.sgml
index 2a9c45a111..f3ae2fc3b8 100644
--- a/doc/src/sgml/sslinfo.sgml
+++ b/doc/src/sgml/sslinfo.sgml
@@ -22,7 +22,8 @@
 
  <para>
   This extension won't build at all unless the installation was
-  configured with <literal>--with-ssl=openssl</literal>.
+  configured with SSL support, such as <literal>--with-ssl=openssl</literal>
+  or <literal>--with-ssl=nss</literal>.
  </para>
 
  <sect2>
@@ -208,6 +209,9 @@ emailAddress
      the X.500 and X.509 standards, so you cannot just assign arbitrary
      meaning to them.
     </para>
+    <para>
+     This function is only available when using <productname>OpenSSL</productname>.
+    </para>
     </listitem>
    </varlistentry>
 
@@ -223,6 +227,9 @@ emailAddress
      Same as <function>ssl_client_dn_field</function>, but for the certificate issuer
      rather than the certificate subject.
     </para>
+    <para>
+     This function is only available when using <productname>OpenSSL</productname>.
+    </para>
     </listitem>
    </varlistentry>
 
@@ -238,6 +245,9 @@ emailAddress
      Provide information about extensions of client certificate: extension name,
      extension value, and if it is a critical extension.
     </para>
+    <para>
+     This function is only available when using <productname>OpenSSL</productname>.
+    </para>
     </listitem>
    </varlistentry>
   </variablelist>
diff --git a/src/tools/msvc/Install.pm b/src/tools/msvc/Install.pm
index ea3af48777..afe72a7e97 100644
--- a/src/tools/msvc/Install.pm
+++ b/src/tools/msvc/Install.pm
@@ -438,7 +438,8 @@ sub CopyContribFiles
 		{
 			# These configuration-based exclusions must match vcregress.pl
 			next if ($d eq "uuid-ossp"  && !defined($config->{uuid}));
-			next if ($d eq "sslinfo"    && !defined($config->{openssl}));
+			next if ($d eq "sslinfo"    && !defined($config->{openssl})
+			  && !defined($config->{nss}));
 			next if ($d eq "xml2"       && !defined($config->{xml}));
 			next if ($d =~ /_plperl$/   && !defined($config->{perl}));
 			next if ($d =~ /_plpython$/ && !defined($config->{python}));
diff --git a/src/tools/msvc/Mkvcbuild.pm b/src/tools/msvc/Mkvcbuild.pm
index ff01acf3f6..660387d0e8 100644
--- a/src/tools/msvc/Mkvcbuild.pm
+++ b/src/tools/msvc/Mkvcbuild.pm
@@ -445,9 +445,14 @@ sub mkvcbuild
 		push @contrib_excludes, 'xml2';
 	}
 
+	if (!$solution->{options}->{openssl} && !$solution->{options}->{nss})
+	{
+		push @contrib_excludes, 'sslinfo';
+	}
+
 	if (!$solution->{options}->{openssl})
 	{
-		push @contrib_excludes, 'sslinfo', 'ssl_passphrase_callback';
+		push @contrib_excludes, 'ssl_passphrase_callback';
 	}
 
 	if (!$solution->{options}->{uuid})
@@ -477,6 +482,11 @@ sub mkvcbuild
 		$pgcrypto->AddFiles('contrib/pgcrypto', 'openssl.c',
 			'pgp-mpi-openssl.c');
 	}
+	elsif ($solution->{options}->{nss})
+	{
+		$pgcrypto->AddFiles('contrib/pgcrypto', 'nss.c',
+			'pgp-mpi-internal.c', 'imath.c', 'blf.c');
+	}
 	else
 	{
 		$pgcrypto->AddFiles(
-- 
2.21.1 (Apple Git-122.3)

From 5eb0a47349f983709ee431b24dd6332b50b96bef Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Wed, 28 Oct 2020 11:26:31 +0100
Subject: [PATCH v24 4/6] NSS Documentation

---
 doc/src/sgml/acronyms.sgml     |  43 ++++++++++++
 doc/src/sgml/config.sgml       |  28 +++++++-
 doc/src/sgml/installation.sgml |  31 ++++++---
 doc/src/sgml/libpq.sgml        |  99 +++++++++++++++++++++++++-
 doc/src/sgml/runtime.sgml      | 123 +++++++++++++++++++++++++++++++--
 5 files changed, 305 insertions(+), 19 deletions(-)

diff --git a/doc/src/sgml/acronyms.sgml b/doc/src/sgml/acronyms.sgml
index 4e5ec983c0..7b02c8a622 100644
--- a/doc/src/sgml/acronyms.sgml
+++ b/doc/src/sgml/acronyms.sgml
@@ -441,6 +441,28 @@
     </listitem>
    </varlistentry>
 
+   <varlistentry>
+    <term><acronym>NSPR</acronym></term>
+    <listitem>
+     <para>
+      <ulink
+      url="https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSPR">
+      Netscape Portable Runtime</ulink>
+     </para>
+    </listitem>
+   </varlistentry>
+
+   <varlistentry>
+    <term><acronym>NSS</acronym></term>
+    <listitem>
+     <para>
+      <ulink
+      url="https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS">
+      Network Security Services</ulink>
+     </para>
+    </listitem>
+   </varlistentry>
+
    <varlistentry>
     <term><acronym>ODBC</acronym></term>
     <listitem>
@@ -539,6 +561,17 @@
     </listitem>
    </varlistentry>
 
+   <varlistentry>
+    <term><acronym>PKCS#12</acronym></term>
+    <listitem>
+     <para>
+      <ulink
+      url="https://en.wikipedia.org/wiki/PKCS_12">
+      Public-Key Cryptography Standards #12</ulink>
+     </para>
+    </listitem>
+   </varlistentry>
+
    <varlistentry>
     <term><acronym>PL</acronym></term>
     <listitem>
@@ -684,6 +717,16 @@
     </listitem>
    </varlistentry>
 
+   <varlistentry>
+    <term><acronym>TLS</acronym></term>
+    <listitem>
+     <para>
+      <ulink url="https://en.wikipedia.org/wiki/Transport_Layer_Security">
+      Transport Layer Security</ulink>
+     </para>
+    </listitem>
+   </varlistentry>
+
    <varlistentry>
     <term><acronym>TOAST</acronym></term>
     <listitem>
diff --git a/doc/src/sgml/config.sgml b/doc/src/sgml/config.sgml
index e17cdcc816..b33cffb370 100644
--- a/doc/src/sgml/config.sgml
+++ b/doc/src/sgml/config.sgml
@@ -1238,6 +1238,23 @@ include_dir 'conf.d'
       </listitem>
      </varlistentry>
 
+     <varlistentry id="guc-ssl-database" xreflabel="ssl_database">
+      <term><varname>ssl_database</varname> (<type>string</type>)
+      <indexterm>
+       <primary><varname>ssl_database</varname> configuration parameter</primary>
+      </indexterm>
+      </term>
+      <listitem>
+       <para>
+        Specifies the name of the file containing the server certificates and
+        keys when using <productname>NSS</productname> for <acronym>SSL</acronym>
+        connections. This parameter can only be set in the
+        <filename>postgresql.conf</filename> file or on the server command
+        line.
+       </para>
+      </listitem>
+     </varlistentry>
+
      <varlistentry id="guc-ssl-ciphers" xreflabel="ssl_ciphers">
       <term><varname>ssl_ciphers</varname> (<type>string</type>)
       <indexterm>
@@ -1254,7 +1271,9 @@ include_dir 'conf.d'
         connections using TLS version 1.2 and lower are affected.  There is
         currently no setting that controls the cipher choices used by TLS
         version 1.3 connections.  The default value is
-        <literal>HIGH:MEDIUM:+3DES:!aNULL</literal>.  The default is usually a
+        <literal>HIGH:MEDIUM:+3DES:!aNULL</literal> for servers which have
+        been built with <productname>OpenSSL</productname> as the
+        <acronym>SSL</acronym> library.  The default is usually a
         reasonable choice unless you have specific security requirements.
        </para>
 
@@ -1456,8 +1475,11 @@ include_dir 'conf.d'
        <para>
         Sets an external command to be invoked when a passphrase for
         decrypting an SSL file such as a private key needs to be obtained.  By
-        default, this parameter is empty, which means the built-in prompting
-        mechanism is used.
+        default, this parameter is empty. When the server is using
+        <productname>OpenSSL</productname>, this means the built-in prompting
+        mechanism is used. When using <productname>NSS</productname>, there is
+        no default prompting so a blank callback will be used returning an
+        empty password.
        </para>
        <para>
         The command must print the passphrase to the standard output and exit
diff --git a/doc/src/sgml/installation.sgml b/doc/src/sgml/installation.sgml
index 66ad4ba938..1b71881c6e 100644
--- a/doc/src/sgml/installation.sgml
+++ b/doc/src/sgml/installation.sgml
@@ -976,15 +976,30 @@ build-postgresql:
        <listitem>
         <para>
          Build with support for <acronym>SSL</acronym> (encrypted)
-         connections. The only <replaceable>LIBRARY</replaceable>
-         supported is <option>openssl</option>. This requires the
-         <productname>OpenSSL</productname> package to be installed.
-         <filename>configure</filename> will check for the required
-         header files and libraries to make sure that your
-         <productname>OpenSSL</productname> installation is sufficient
-         before proceeding. 
+         connections. <replaceable>LIBRARY</replaceable> must be one of:
         </para>
-       </listitem>
+        <itemizedlist>
+         <listitem>
+          <para>
+           <option>openssl</option> to build with <productname>OpenSSL</productname> support.
+            This requires the <productname>OpenSSL</productname>
+            package to be installed.  <filename>configure</filename> will check
+            for the required header files and libraries to make sure that
+            your <productname>OpenSSL</productname> installation is sufficient
+            before proceeding.
+          </para>
+         </listitem>
+         <listitem>
+          <para>
+           <option>nss</option> to build with <productname>libnss</productname> support.
+            This requires the <productname>NSS</productname> package to be installed. Additionally,
+            <productname>NSS</productname> requires <productname>NSPR</productname>
+            to be installed. <filename>configure</filename> will check for the
+            required header files and libraries to make sure that your
+            <productname>NSS</productname> installation is sufficient before
+            proceeding.
+          </para>
+         </listitem>
       </varlistentry>
 
       <varlistentry>
diff --git a/doc/src/sgml/libpq.sgml b/doc/src/sgml/libpq.sgml
index b7a82453f0..89796de168 100644
--- a/doc/src/sgml/libpq.sgml
+++ b/doc/src/sgml/libpq.sgml
@@ -830,6 +830,12 @@ int callback_fn(char *buf, int size, PGconn *conn);
        <function>longjmp(...)</function>, etc. It must return normally.
       </para>
 
+      <para>
+        <function>PQsetSSLKeyPassHook_OpenSSL</function> is only available
+        when the server was compiled with <productname>OpenSSL</productname>
+        support.
+      </para>
+
      </listitem>
     </varlistentry>
 
@@ -846,6 +852,72 @@ PQsslKeyPassHook_OpenSSL_type PQgetSSLKeyPassHook_OpenSSL(void);
 </synopsis>
       </para>
 
+      <para>
+        <function>PQgetSSLKeyPassHook_OpenSSL</function> is only available
+        when the server was compiled with <productname>OpenSSL</productname>
+        support.
+      </para>
+
+     </listitem>
+    </varlistentry>
+
+    <varlistentry id="libpq-pqsetsslkeypasshook-nss">
+     <term><function>PQsetSSLKeyPassHook_nss</function><indexterm><primary>PQsetSSLKeyPassHook_nss</primary></indexterm></term>
+     <listitem>
+      <para>
+       <function>PQsetSSLKeyPassHook_nss</function> lets an application override
+       <application>libpq</application>'s default handling of password protected
+       objects in the <application>NSS</application> database using
+       <xref linkend="libpq-connect-sslpassword"/> or interactive prompting.
+
+<synopsis>
+void PQsetSSLKeyPassHook_nss(PQsslKeyPassHook_nss_type hook);
+</synopsis>
+
+       The application passes a pointer to a callback function with signature:
+<programlisting>
+char *callback_fn(PK11SlotInfo *slot, PRBool retry, void *arg);
+</programlisting>
+       which <application>libpq</application> will call
+       <emphasis>instead of</emphasis> its default
+       <function>PQdefaultSSLKeyPassHook_nss</function> password handler. The
+       callback should determine the password for the token and return a
+       pointer to it. The returned pointer should be allocated with the NSS
+       <function>PORT_Strdup</function> function. The token for which the
+       password is requested is recorded in the slot anc can be identified by
+       calling <function>PK11_GetTokenName</function>. If no password is
+       known, the callback should return <literal>NULL</literal>. The memory
+       will be owned by <productname>NSS</productname> and should not be
+       freed.
+      </para>
+
+      <para>
+        <function>PQsetSSLKeyPassHook_nss</function> is only available
+        when the server was compiled with <productname>NSS</productname>
+        support.
+      </para>
+     </listitem>
+    </varlistentry>
+
+    <varlistentry id="libpq-pqgetsslkeypasshook-nss">
+     <term><function>PQgetSSLKeyPassHook_nss</function><indexterm><primary>PQgetSSLKeyPassHook_nss</primary></indexterm></term>
+     <listitem>
+      <para>
+       <function>PQgetSSLKeyPassHook_nss</function> returns the current
+       <productname>NSS</productname> password hook, or <literal>NULL</literal>
+       if none has been set.
+
+<synopsis>
+PQsslKeyPassHook_nss_type PQgetSSLKeyPassHook_nss(void);
+</synopsis>
+      </para>
+
+      <para>
+        <function>PQgetSSLKeyPassHook_nss</function> is only available
+        when the server was compiled with <productname>nss</productname>
+        support.
+      </para>
+
      </listitem>
     </varlistentry>
 
@@ -2497,6 +2569,8 @@ void *PQsslStruct(const PGconn *conn, const char *struct_name);
       </para>
       <para>
        The struct(s) available depend on the SSL implementation in use.
+      </para>
+      <para>
        For <productname>OpenSSL</productname>, there is one struct,
        available under the name "OpenSSL", and it returns a pointer to the
        <productname>OpenSSL</productname> <literal>SSL</literal> struct.
@@ -2520,9 +2594,14 @@ void *PQsslStruct(const PGconn *conn, const char *struct_name);
 ]]></programlisting>
       </para>
       <para>
-       This structure can be used to verify encryption levels, check server
-       certificates, and more. Refer to the <productname>OpenSSL</productname>
-       documentation for information about this structure.
+       For <productname>NSS</productname>, there is one struct available under
+       the name "NSS", and it returns a pointer to the
+       <productname>NSS</productname> <literal>PRFileDesc</literal>.
+      </para>
+      <para>
+       These structures can be used to verify encryption levels, check server
+       certificates, and more. Refer to the <acronym>SSL</acronym> library
+       documentation for information about these structures.
       </para>
      </listitem>
     </varlistentry>
@@ -2549,6 +2628,10 @@ void *PQgetssl(const PGconn *conn);
        <xref linkend="libpq-PQsslInUse"/> instead, and for more details about the
        connection, use <xref linkend="libpq-PQsslAttribute"/>.
       </para>
+      <para>
+       This function returns <literal>NULL</literal> when <acronym>SSL</acronym>
+       librariaes other than <productname>OpenSSL</productname> are used.
+      </para>
      </listitem>
     </varlistentry>
 
@@ -7982,6 +8065,11 @@ void PQinitOpenSSL(int do_ssl, int do_crypto);
        before first opening a database connection.  Also be sure that you
        have done that initialization before opening a database connection.
       </para>
+
+      <para>
+       This function does nothing when using <productname>NSS</productname> as
+       the <acronym>SSL</acronym> library.
+      </para>
      </listitem>
     </varlistentry>
 
@@ -8008,6 +8096,11 @@ void PQinitSSL(int do_ssl);
        might be preferable for applications that need to work with older
        versions of <application>libpq</application>.
       </para>
+
+      <para>
+       This function does nothing when using <productname>NSS</productname> as
+       the <acronym>SSL</acronym> library.
+      </para>
      </listitem>
     </varlistentry>
    </variablelist>
diff --git a/doc/src/sgml/runtime.sgml b/doc/src/sgml/runtime.sgml
index bf877c0e0c..2578ee8c06 100644
--- a/doc/src/sgml/runtime.sgml
+++ b/doc/src/sgml/runtime.sgml
@@ -2185,15 +2185,21 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
 
   <indexterm zone="ssl-tcp">
    <primary>SSL</primary>
+   <secondary>TLS</secondary>
   </indexterm>
 
   <para>
    <productname>PostgreSQL</productname> has native support for using
    <acronym>SSL</acronym> connections to encrypt client/server communications
    for increased security. This requires that
-   <productname>OpenSSL</productname> is installed on both client and
+   a supported TLS library is installed on both client and
    server systems and that support in <productname>PostgreSQL</productname> is
    enabled at build time (see <xref linkend="installation"/>).
+   Supported libraries are <productname>OpenSSL</productname> and
+   <productname>NSS</productname>. The terms <acronym>SSL</acronym> and
+   <acronym>TLS</acronym> are often used interchangeably to mean a secure
+   connection using a <acronym>TLS</acronym> protocol, even though
+   <acronym>SSL</acronym> protocols are no longer supported.
   </para>
 
   <sect2 id="ssl-setup">
@@ -2213,8 +2219,13 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
   </para>
 
   <para>
-   To start in <acronym>SSL</acronym> mode, files containing the server certificate
-   and private key must exist.  By default, these files are expected to be
+   To start in <acronym>SSL</acronym> mode, a server certificate
+   and private key must exist. The below sections on the different libraries
+   will discuss how to configure these.
+  </para>
+   
+  <para>
+   By default, these files are expected to be
    named <filename>server.crt</filename> and <filename>server.key</filename>, respectively, in
    the server's data directory, but other names and locations can be specified
    using the configuration parameters <xref linkend="guc-ssl-cert-file"/>
@@ -2304,6 +2315,18 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
   </note>
   </sect2>
 
+  <sect2 id="ssl-nss-config">
+   <title>NSS Configuration</title>
+
+  <para>
+   <productname>PostgreSQL</productname> will look for certificates and keys
+   in the <productname>NSS</productname> database specified by the parameter
+   <xref linkend="guc-ssl-database"/> in <filename>postgresql.conf</filename>.
+   The parameters for certificate and key filenames are used to identify the
+   nicknames in the database.
+  </para>
+  </sect2>
+
   <sect2 id="ssl-client-certificates">
    <title>Using Client Certificates</title>
 
@@ -2378,7 +2401,7 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
   </sect2>
 
   <sect2 id="ssl-server-files">
-   <title>SSL Server File Usage</title>
+   <title>SSL Server File Parameter Usage</title>
 
    <para>
     <xref linkend="ssl-file-usage"/> summarizes the files that are
@@ -2425,6 +2448,14 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
       <entry>client certificate must not be on this list</entry>
      </row>
 
+     <row>
+      <entry><xref linkend="guc-ssl-database"/></entry>
+      <entry>certificate database</entry>
+      <entry>contains server certificates, keys and revocation lists; only
+      used when <productname>PostgreSQL</productname> is built with support
+      for <productname>NSS</productname>.</entry>
+     </row>
+
     </tbody>
    </tgroup>
   </table>
@@ -2448,7 +2479,7 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
   </sect2>
 
   <sect2 id="ssl-certificate-creation">
-   <title>Creating Certificates</title>
+   <title>Creating Certificates with OpenSSL</title>
 
    <para>
      To create a simple self-signed certificate for the server, valid for 365
@@ -2552,6 +2583,88 @@ openssl x509 -req -in server.csr -text -days 365 \
    </para>
   </sect2>
 
+  <sect2 id="nss-certificate-database">
+   <title>NSS Certificate Databases</title>
+
+   <para>
+    When using <productname>NSS</productname>, all certificates and keys must
+    be loaded into an <productname>NSS</productname> certificate database.
+   </para>
+
+   <para>
+    To create a new <productname>NSS</productname> certificate database and
+    load the certificates created in <xref linkend="ssl-certificate-creation" />,
+    use the following <productname>NSS</productname> commands:
+<programlisting>
+certutil -d "sql:server.db" -N --empty-password
+certutil -d "sql:server.db" -A -n server.crt -i server.crt -t "CT,C,C"
+certutil -d "sql:server.db" -A -n root.crt -i root.crt -t "CT,C,C"
+</programlisting>
+    This will give the certificate the filename as the nickname identifier in
+    the database which is created as <filename>server.db</filename>.
+   </para>
+   <para>
+    Then load the server key, which require converting it to
+    <acronym>PKCS#12</acronym> format using the
+    <productname>OpenSSL</productname> tools:
+<programlisting>
+openssl pkcs12 -export -out server.pfx -inkey server.key -in server.crt \
+  -certfile root.crt -passout pass:
+pk12util -i server.pfx -d server.db -W ''
+</programlisting>
+   </para>
+   <para>
+    Finally a certificate revocation list can be loaded with the following
+    commands:
+<programlisting>
+crlutil -I -i server.crl -d server.db -B
+</programlisting>
+   </para>
+  </sect2>
+
+  <sect2 id="nss-ssl-certificate-creation" />
+   <title>Creating Certificates with NSS</title>
+
+   <para>
+    To create a simple self-signed CA and certificate for the server, use the
+    following NSS commands. Replace
+    <replaceable>*.yourdomain.com</replaceable> with the server's host
+    name. Remove <replaceable>--empty-password</replaceable> in order to set
+    a password protecting the databases. The password can be passed to
+    <application>certutil</certutil> with the <literal>-f</literal> parameter.
+    First create a self-signed CA. To use a different certificate validity
+    time than the default, use <replaceable>-v</replaceable> to specify the
+    number of months of validity.
+<programlisting>
+mkdir root_ca.db
+certutil -N -d "sql:root_ca.db/" --empty-password
+certutil -S -d "sql:root_ca.db/" -n root_ca -s "CN=<replaceable>ca.yourdomain.com</replaceable>" \
+  -x -k rsa -g 2048 -m <replaceable>5432</replaceable> -t CTu,CTu,CTu \
+  --keyUsage certSigning -2 --nsCertType sslCA,smimeCA,objectSigningCA \
+  -Z SHA256
+certutil -L -d "sql:root_ca.db/" -n root_ca -a > root_ca.pem
+</programlisting>
+    Now create a server certificate database, and create a certificate signing
+    request for the CA. Then sign the request with the already created CA and
+    insert the certificate chain into the certificate database.
+<programlisting>
+mkdir server_cert.db
+certutil -N -d "sql:server_cert.db/" --empty-password
+certutil -R -d "sql:server_cert.db/" -s "CN=dbhost.yourdomain.com" \
+  -o server_cert.csr -g 2048 -Z SHA256
+
+certutil -C -d "sql:root_ca.db/" -c root_ca -i server_cert.csr \
+  -o server_cert.der -m <replaceable>5433</replaceable> \
+  --keyUsage keyEncipherment,dataEncipherment,digitalSignature \
+  --nsCertType sslServer -Z SHA256
+
+certutil -A -d "sql:server_cert.db/" -n root_ca -t CTu,CTu,CTu -a -i root_ca.pem
+certutil -A -d "sql:server_cert.db/" -n server_cert -t CTu,CTu,CTu -i server_cert.der
+</programlisting>
+    The server certificate is loaded into the certificate database as well as
+    the CA certificate in order to provide the chain of certificates.
+  </sect2>
+
  </sect1>
 
  <sect1 id="gssapi-enc">
-- 
2.21.1 (Apple Git-122.3)

From 60f57667edc89f2c95c3d99882c29d15b16903dd Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Wed, 28 Oct 2020 11:24:02 +0100
Subject: [PATCH v24 3/6] NSS pg_strong_random support

---
 configure                   |  1 +
 configure.ac                |  1 +
 src/include/pg_config.h.in  |  3 +++
 src/port/pg_strong_random.c | 50 ++++++++++++++++++++++++++++++++++++-
 4 files changed, 54 insertions(+), 1 deletion(-)

diff --git a/configure b/configure
index 143726c79c..2b83914289 100755
--- a/configure
+++ b/configure
@@ -18422,6 +18422,7 @@ $as_echo "NSS" >&6; }
 elif test x"$PORTNAME" = x"win32" ; then
   { $as_echo "$as_me:${as_lineno-$LINENO}: result: Windows native" >&5
 $as_echo "Windows native" >&6; }
+
 else
   { $as_echo "$as_me:${as_lineno-$LINENO}: result: /dev/urandom" >&5
 $as_echo "/dev/urandom" >&6; }
diff --git a/configure.ac b/configure.ac
index 59657a6010..6533e10ffd 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2197,6 +2197,7 @@ elif test x"$with_ssl" = x"nss" ; then
   AC_MSG_RESULT([NSS])
 elif test x"$PORTNAME" = x"win32" ; then
   AC_MSG_RESULT([Windows native])
+
 else
   AC_MSG_RESULT([/dev/urandom])
   AC_CHECK_FILE([/dev/urandom], [], [])
diff --git a/src/include/pg_config.h.in b/src/include/pg_config.h.in
index 8856a33590..fa5a977617 100644
--- a/src/include/pg_config.h.in
+++ b/src/include/pg_config.h.in
@@ -908,6 +908,9 @@
 /* Define to build with NSS support (--with-ssl=nss) */
 #undef USE_NSS
 
+/* Define to use NSS for random number generation */
+#undef USE_NSS_RANDOM
+
 /* Define to 1 to use software CRC-32C implementation (slicing-by-8). */
 #undef USE_SLICING_BY_8_CRC32C
 
diff --git a/src/port/pg_strong_random.c b/src/port/pg_strong_random.c
index 07f24c0089..40de237628 100644
--- a/src/port/pg_strong_random.c
+++ b/src/port/pg_strong_random.c
@@ -137,7 +137,55 @@ pg_strong_random(void *buf, size_t len)
 	return false;
 }
 
-#else							/* not USE_OPENSSL or WIN32 */
+#elif defined(USE_NSS)
+
+#define pg_BITS_PER_BYTE BITS_PER_BYTE
+#undef BITS_PER_BYTE
+#define NO_NSPR_10_SUPPORT
+#include <nss/nss.h>
+#include <nss/pk11pub.h>
+#if defined(BITS_PER_BYTE)
+#if BITS_PER_BYTE != pg_BITS_PER_BYTE
+#error "incompatible byte widths between NSPR and postgres"
+#endif
+#else
+#define BITS_PER_BYTE pg_BITS_PER_BYTE
+#endif
+#undef pg_BITS_PER_BYTE
+
+void
+pg_strong_random_init(void)
+{
+	/* No initialization needed on NSS */
+}
+
+bool
+pg_strong_random(void *buf, size_t len)
+{
+	NSSInitParameters params;
+	NSSInitContext *nss_context;
+	SECStatus	status;
+
+	memset(&params, 0, sizeof(params));
+	params.length = sizeof(params);
+	nss_context = NSS_InitContext("", "", "", "", &params,
+								  NSS_INIT_READONLY | NSS_INIT_NOCERTDB |
+								  NSS_INIT_NOMODDB | NSS_INIT_FORCEOPEN |
+								  NSS_INIT_NOROOTINIT | NSS_INIT_PK11RELOAD);
+
+	if (!nss_context)
+		return false;
+
+	status = PK11_GenerateRandom(buf, len);
+	NSS_ShutdownContext(nss_context);
+
+	if (status == SECSuccess)
+		return true;
+
+	return false;
+}
+
+#else							/* not USE_OPENSSL, USE_NSS or WIN32 */
 
 /*
  * Without OpenSSL or Win32 support, just read /dev/urandom ourselves.
-- 
2.21.1 (Apple Git-122.3)

From 6af78eaeed3301ff9586d32b0a3e0a64823b9340 Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Wed, 28 Oct 2020 11:22:26 +0100
Subject: [PATCH v24 2/6] NSS Testharness updates

TODO:
	* Generate certificate/keys with NSS tooling for NSS specific test
	* Add test for certificate with embedded nulls
	* Fix SCRAM tests when channel binding works
---
 src/test/ssl/Makefile                         | 233 ++++++++++++
 src/test/ssl/t/001_ssltests.pl                | 350 +++++++++++-------
 src/test/ssl/t/002_scram.pl                   |  96 +++--
 src/test/ssl/t/SSL/Backend/NSS.pm             |  73 ++++
 src/test/ssl/t/SSL/Backend/OpenSSL.pm         | 103 ++++++
 .../ssl/t/{SSLServer.pm => SSL/Server.pm}     |  80 +++-
 6 files changed, 743 insertions(+), 192 deletions(-)
 create mode 100644 src/test/ssl/t/SSL/Backend/NSS.pm
 create mode 100644 src/test/ssl/t/SSL/Backend/OpenSSL.pm
 rename src/test/ssl/t/{SSLServer.pm => SSL/Server.pm} (78%)

diff --git a/src/test/ssl/Makefile b/src/test/ssl/Makefile
index d545382eea..d275c89672 100644
--- a/src/test/ssl/Makefile
+++ b/src/test/ssl/Makefile
@@ -30,6 +30,35 @@ SSLFILES := $(CERTIFICATES:%=ssl/%.key) $(CERTIFICATES:%=ssl/%.crt) \
 	ssl/client+client_ca.crt ssl/client-der.key \
 	ssl/client-encrypted-pem.key ssl/client-encrypted-der.key
 
+# Even though we in practice could get away with far fewer NSS databases, they
+# are generated to mimic the setup for the OpenSSL tests in order to ensure
+# we isolate the same behavior between the backends. The database name should
+# contain the files included for easier test suite code reading.
+NSSFILES := ssl/nss/client_ca.crt.db \
+	ssl/nss/server_ca.crt.db \
+	ssl/nss/root+server_ca.crt.db \
+	ssl/nss/root+client_ca.crt.db \
+	ssl/nss/client.crt__client.key.db \
+	ssl/nss/client-revoked.crt__client-revoked.key.db \
+	ssl/nss/server-cn-only.crt__server-password.key.db \
+	ssl/nss/server-cn-only.crt__server-cn-only.key.db \
+	ssl/nss/root.crl \
+	ssl/nss/server.crl \
+	ssl/nss/client.crl \
+	ssl/nss/server-multiple-alt-names.crt__server-multiple-alt-names.key.db \
+	ssl/nss/server-single-alt-name.crt__server-single-alt-name.key.db \
+	ssl/nss/server-cn-and-alt-names.crt__server-cn-and-alt-names.key.db \
+	ssl/nss/server-no-names.crt__server-no-names.key.db \
+	ssl/nss/server-revoked.crt__server-revoked.key.db \
+	ssl/nss/root+client.crl \
+	ssl/nss/client+client_ca.crt__client.key.db \
+	ssl/nss/client.crt__client-encrypted-pem.key.db \
+	ssl/nss/root+server_ca.crt__server.crl.db \
+	ssl/nss/root+server_ca.crt__root+server.crl.db \
+	ssl/nss/native_ca-root.db \
+	ssl/nss/native_server-root.db \
+	ssl/nss/native_client-root.db
+
 # This target re-generates all the key and certificate files. Usually we just
 # use the ones that are committed to the tree without rebuilding them.
 #
@@ -37,6 +66,10 @@ SSLFILES := $(CERTIFICATES:%=ssl/%.key) $(CERTIFICATES:%=ssl/%.crt) \
 #
 sslfiles: $(SSLFILES)
 
+# Generate NSS certificate databases corresponding to the OpenSSL certificates.
+# This target will fail unless preceded by nssfiles-clean.
+nssfiles: $(NSSFILES)
+
 # OpenSSL requires a directory to put all generated certificates in. We don't
 # use this for anything, but we need a location.
 ssl/new_certs_dir:
@@ -64,6 +97,24 @@ ssl/%_ca.crt: ssl/%_ca.key %_ca.config ssl/root_ca.crt ssl/new_certs_dir
 	rm ssl/temp_ca.crt ssl/temp_ca_signed.crt
 	echo "01" > ssl/$*_ca.srl
 
+ssl/nss/%_ca.crt.db: ssl/%_ca.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n $*_ca.crt -i ssl/$*_ca.crt -t "CT,C,C"
+
+ssl/nss/root+server_ca.crt__server.crl.db: ssl/root+server_ca.crt ssl/nss/server.crl
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	crlutil -I -i ssl/nss/server.crl -d $@ -B
+
+ssl/nss/root+server_ca.crt__root+server.crl.db: ssl/root+server_ca.crt ssl/nss/root.crl ssl/nss/server.crl
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	crlutil -I -i ssl/nss/root.crl -d $@ -B
+	crlutil -I -i ssl/nss/server.crl -d $@ -B
+
 # Server certificates, signed by server CA:
 ssl/server-%.crt: ssl/server-%.key ssl/server_ca.crt server-%.config
 	openssl req -new -key ssl/server-$*.key -out ssl/server-$*.csr -config server-$*.config
@@ -77,6 +128,78 @@ ssl/server-ss.crt: ssl/server-cn-only.key ssl/server-cn-only.crt server-cn-only.
 	openssl x509 -req -days 10000 -in ssl/server-ss.csr -signkey ssl/server-cn-only.key -out ssl/server-ss.crt  -extensions v3_req -extfile server-cn-only.config
 	rm ssl/server-ss.csr
 
+# pk12util won't preserve the password when importing the password protected
+# key, the password must be set on the database *before* importing it as the
+# password in the pkcs12 envelope will be dropped.
+ssl/nss/server-cn-only.crt__server-password.key.db: ssl/server-cn-only.crt
+	$(MKDIR_P) $@
+	echo "secret1" > password.txt
+	certutil -d "sql:$@" -N -f password.txt
+	certutil -d "sql:$@" -A -n ssl/server-cn-only.crt -i ssl/server-cn-only.crt -t "CT,C,C" -f password.txt
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C" -f password.txt
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C" -f password.txt
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C" -f password.txt
+	openssl pkcs12 -export -out ssl/nss/server-password.pfx -inkey ssl/server-password.key -in ssl/server-cn-only.crt -certfile ssl/server_ca.crt -passin 'pass:secret1' -passout 'pass:secret1'
+	pk12util -i ssl/nss/server-password.pfx -d "sql:$@" -W 'secret1' -K 'secret1'
+
+ssl/nss/server-cn-only.crt__server-cn-only.key.db: ssl/server-cn-only.crt ssl/server-cn-only.key
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-cn-only.crt -i ssl/server-cn-only.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-cn-only.pfx -inkey ssl/server-cn-only.key -in ssl/server-cn-only.crt -certfile ssl/server_ca.crt -passout pass:
+	pk12util -i ssl/nss/server-cn-only.pfx -d "sql:$@" -W ''
+
+ssl/nss/server-multiple-alt-names.crt__server-multiple-alt-names.key.db: ssl/server-multiple-alt-names.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-multiple-alt-names.crt -i ssl/server-multiple-alt-names.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-multiple-alt-names.pfx -inkey ssl/server-multiple-alt-names.key -in ssl/server-multiple-alt-names.crt -certfile ssl/server-multiple-alt-names.crt -passout pass:
+	pk12util -i ssl/nss/server-multiple-alt-names.pfx -d "sql:$@" -W ''
+
+ssl/nss/server-single-alt-name.crt__server-single-alt-name.key.db: ssl/server-single-alt-name.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-single-alt-name.crt -i ssl/server-single-alt-name.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-single-alt-name.pfx -inkey ssl/server-single-alt-name.key -in ssl/server-single-alt-name.crt -certfile ssl/server-single-alt-name.crt -passout pass:
+	pk12util -i ssl/nss/server-single-alt-name.pfx -d "sql:$@" -W ''
+
+ssl/nss/server-cn-and-alt-names.crt__server-cn-and-alt-names.key.db: ssl/server-cn-and-alt-names.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-cn-and-alt-names.crt -i ssl/server-cn-and-alt-names.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-cn-and-alt-names.pfx -inkey ssl/server-cn-and-alt-names.key -in ssl/server-cn-and-alt-names.crt -certfile ssl/server-cn-and-alt-names.crt -passout pass:
+	pk12util -i ssl/nss/server-cn-and-alt-names.pfx -d $@ -W ''
+
+ssl/nss/server-no-names.crt__server-no-names.key.db: ssl/server-no-names.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-no-names.crt -i ssl/server-no-names.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-no-names.pfx -inkey ssl/server-no-names.key -in ssl/server-no-names.crt -certfile ssl/server-no-names.crt -passout pass:
+	pk12util -i ssl/nss/server-no-names.pfx -d "sql:$@" -W ''
+
+ssl/nss/server-revoked.crt__server-revoked.key.db: ssl/server-revoked.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-revoked.crt -i ssl/server-revoked.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-revoked.pfx -inkey ssl/server-revoked.key -in ssl/server-revoked.crt -certfile ssl/server-revoked.crt -passout pass:
+	pk12util -i ssl/nss/server-revoked.pfx -d "sql:$@" -W ''
+
 # Password-protected version of server-cn-only.key
 ssl/server-password.key: ssl/server-cn-only.key
 	openssl rsa -aes256 -in $< -out $@ -passout 'pass:secret1'
@@ -88,6 +211,27 @@ ssl/client.crt: ssl/client.key ssl/client_ca.crt
 	openssl x509 -in ssl/temp.crt -out ssl/client.crt # to keep just the PEM cert
 	rm ssl/client.csr ssl/temp.crt
 
+# Client certificate, signed by client CA
+ssl/nss/client.crt__client.key.db: ssl/client.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/client.crt -i ssl/client.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root+client_ca.crt -i ssl/root+client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client.pfx -inkey ssl/client.key -in ssl/client.crt -certfile ssl/client_ca.crt -passout pass:
+	pk12util -i ssl/nss/client.pfx -d "sql:$@" -W ''
+
+# Client certificate with encrypted key, signed by client CA
+ssl/nss/client.crt__client-encrypted-pem.key.db: ssl/client.crt
+	$(MKDIR_P) $@
+	echo 'dUmmyP^#+' > $@.pass
+	certutil -d "sql:$@" -N -f $@.pass
+	certutil -d "sql:$@" -A -f $@.pass -n ssl/client.crt -i ssl/client.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -f $@.pass -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -f $@.pass -n root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client-encrypted-pem.pfx -inkey ssl/client-encrypted-pem.key -in ssl/client.crt -certfile ssl/client_ca.crt -passin pass:'dUmmyP^#+' -passout pass:'dUmmyP^#+'
+	pk12util -i ssl/nss/client-encrypted-pem.pfx -d "sql:$@" -W 'dUmmyP^#+' -k $@.pass
+
 # Another client certificate, signed by the client CA. This one is revoked.
 ssl/client-revoked.crt: ssl/client-revoked.key ssl/client_ca.crt client.config
 	openssl req -new -key ssl/client-revoked.key -out ssl/client-revoked.csr -config client.config
@@ -95,6 +239,14 @@ ssl/client-revoked.crt: ssl/client-revoked.key ssl/client_ca.crt client.config
 	openssl x509 -in ssl/temp.crt -out ssl/client-revoked.crt # to keep just the PEM cert
 	rm ssl/client-revoked.csr ssl/temp.crt
 
+ssl/nss/client-revoked.crt__client-revoked.key.db: ssl/client-revoked.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/client-revoked.crt -i ssl/client-revoked.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client-revoked.pfx -inkey ssl/client-revoked.key -in ssl/client-revoked.crt -certfile ssl/client_ca.crt -passout pass:
+	pk12util -i ssl/nss/client-revoked.pfx -d "sql:$@" -W ''
+
 # Convert the key to DER, to test our behaviour there too
 ssl/client-der.key: ssl/client.key
 	openssl rsa -in ssl/client.key -outform DER -out ssl/client-der.key
@@ -127,19 +279,40 @@ ssl/root+client_ca.crt: ssl/root_ca.crt ssl/client_ca.crt
 ssl/client+client_ca.crt: ssl/client.crt ssl/client_ca.crt
 	cat $^ > $@
 
+# Client certificate, signed by client CA
+ssl/nss/client+client_ca.crt__client.key.db: ssl/client+client_ca.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/client+client_ca.crt -i ssl/client+client_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n ssl/root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client.pfx -inkey ssl/client.key -in ssl/client.crt -certfile ssl/client_ca.crt -passout pass:
+	pk12util -i ssl/nss/client.pfx -d "sql:$@" -W ''
+
 #### CRLs
 
 ssl/client.crl: ssl/client-revoked.crt
 	openssl ca -config cas.config -name client_ca -revoke ssl/client-revoked.crt
 	openssl ca -config cas.config -name client_ca -gencrl -out ssl/client.crl
 
+ssl/nss/client.crl: ssl/client.crl
+	openssl crl -in $^ -outform der -out $@
+
 ssl/server.crl: ssl/server-revoked.crt
 	openssl ca -config cas.config -name server_ca -revoke ssl/server-revoked.crt
 	openssl ca -config cas.config -name server_ca -gencrl -out ssl/server.crl
 
+ssl/nss/server.crl: ssl/server.crl
+	openssl crl -in $^ -outform der -out $@
+
 ssl/root.crl: ssl/root_ca.crt
 	openssl ca -config cas.config -name root_ca -gencrl -out ssl/root.crl
 
+ssl/nss/root.crl: ssl/root.crl
+	openssl crl -in $^ -outform der -out $@
+
+ssl/nss/root+client.crl: ssl/root+client.crl
+	openssl crl -in $^ -outform der -out $@
+
 # If a CRL is used, OpenSSL requires a CRL file for *all* the CAs in the
 # chain, even if some of them are empty.
 ssl/root+server.crl: ssl/root.crl ssl/server.crl
@@ -147,13 +320,73 @@ ssl/root+server.crl: ssl/root.crl ssl/server.crl
 ssl/root+client.crl: ssl/root.crl ssl/client.crl
 	cat $^ > $@
 
+#### NSS specific certificates and keys
+
+#NSSFILES2 := ssl/nss/native_ca-root.db \
+#	ssl/nss/native_server-root.db \
+#	ssl/nss/native_client-root.db
+
+#nssfiles2: $(NSSFILES2)
+
+ssl/nss/native_ca-%.db:
+	$(MKDIR_P) ssl/nss/native_ca-$*.db
+	certutil -N -d "sql:ssl/nss/native_ca-$*.db/" --empty-password
+	echo y > nss_ca_params.txt
+	echo 10 >> nss_ca_params.txt
+	echo y >> nss_ca_params.txt
+	cat nss_ca_params.txt | certutil -S -d "sql:ssl/nss/native_ca-$*.db/" -n ca-$* \
+	-s "CN=Test CA for PostgreSQL SSL regression tests,OU=PostgreSQL test suite" \
+	-x -k rsa -g 2048 -m 5432 -t CTu,CTu,CTu \
+	--keyUsage certSigning -2 --nsCertType sslCA,smimeCA,objectSigningCA \
+	-z Makefile -Z SHA256
+	rm nss_ca_params.txt
+
+ssl/nss/native_ca-%.pem: ssl/nss/native_ca-%.db
+	certutil -L -d "sql:ssl/nss/native_ca-$*.db/" -n ca-$* -a > ssl/nss/native_ca-$*.pem
+
+# Create and sign a server certificate
+ssl/nss/native_server-%.db: ssl/nss/native_ca-%.pem
+	$(MKDIR_P) ssl/nss/native_server-$*.db
+	certutil -N -d "sql:ssl/nss/native_server-$*.db/" --empty-password
+	certutil -R -d "sql:ssl/nss/native_server-$*.db/" \
+		-s "CN=common-name.pg-ssltest.test,OU=PostgreSQL test suite" \
+		-o ssl/nss/native_server-$*.csr -g 2048 -Z SHA256 -z Makefile
+	echo 1 > nss_server_params.txt
+	echo 9 >> nss_server_params.txt
+	cat nss_server_params.txt | certutil -C -d "sql:ssl/nss/native_ca-$*.db/" -c ca-root -i ssl/nss/native_server-$*.csr \
+		-o ssl/nss/native_server_$*.der -m 5433 --keyUsage dataEncipherment,digitalSignature,keyEncipherment \
+		--nsCertType sslServer --certVersion 1 -Z SHA256
+	certutil -A -d "sql:ssl/nss/native_server-$*.db/" -n ca-$* -t CTu,CTu,CTu -a -i ssl/nss/native_ca-$*.pem
+	certutil -A -d "sql:ssl/nss/native_server-$*.db/" -n ssl/native_server-$*.crt -t CTu,CTu,CTu -i ssl/nss/native_server_$*.der
+	rm nss_server_params.txt
+
+# Create and sign a client certificate
+ssl/nss/native_client-%.db: ssl/nss/native_ca-%.pem
+	$(MKDIR_P) ssl/nss/native_client-$*.db
+	certutil -N -d "sql:ssl/nss/native_client-$*.db/" --empty-password
+	certutil -R -d "sql:ssl/nss/native_client-$*.db/" -s "CN=ssltestuser,OU=PostgreSQL test suite" \
+		-o ssl/nss/native_client-$*.csr -g 2048 -Z SHA256 -z Makefile
+	certutil -C -d "sql:ssl/nss/native_ca-$*.db/" -c ca-$* -i ssl/nss/native_client-$*.csr -o ssl/nss/native_client-$*.der \
+		-m 5434 --keyUsage keyEncipherment,dataEncipherment,digitalSignature --nsCertType sslClient \
+		--certVersion 1 -Z SHA256
+	certutil -A -d "sql:ssl/nss/native_client-$*.db" -n ca-$* -t CTu,CTu,CTu -a -i ssl/nss/native_ca-$*.pem
+	certutil -A -d "sql:ssl/nss/native_client-$*.db" -n native_client-$* -t CTu,CTu,CTu -i ssl/nss/native_client-$*.der
+
+nssfiles2clean:
+	rm -rf ssl/nss
+
 .PHONY: sslfiles-clean
 sslfiles-clean:
 	rm -f $(SSLFILES) ssl/client_ca.srl ssl/server_ca.srl ssl/client_ca-certindex* ssl/server_ca-certindex* ssl/root_ca-certindex* ssl/root_ca.srl ssl/temp_ca.crt ssl/temp_ca_signed.crt
 
+.PHONY: nssfiles-clean
+nssfiles-clean:
+	rm -rf ssl/nss
+
 clean distclean maintainer-clean:
 	rm -rf tmp_check
 	rm -rf ssl/*.old ssl/new_certs_dir ssl/client*_tmp.key
+	rm -rf ssl/nss
 
 # Doesn't depend on $(SSLFILES) because we don't rebuild them by default
 check:
diff --git a/src/test/ssl/t/001_ssltests.pl b/src/test/ssl/t/001_ssltests.pl
index 7928de4e7c..6b8bca2846 100644
--- a/src/test/ssl/t/001_ssltests.pl
+++ b/src/test/ssl/t/001_ssltests.pl
@@ -4,20 +4,27 @@ use PostgresNode;
 use TestLib;
 use Test::More;
 
-use File::Copy;
-
 use FindBin;
 use lib $FindBin::RealBin;
 
-use SSLServer;
+use SSL::Server;
+
+my $openssl;
+my $nss;
 
-if ($ENV{with_ssl} ne 'openssl')
+if ($ENV{with_ssl} eq 'openssl')
+{
+	$openssl = 1;
+	plan tests => 93;
+}
+elsif ($ENV{with_ssl} eq 'nss')
 {
-	plan skip_all => 'OpenSSL not supported by this build';
+	$nss = 1;
+	plan tests => 99;
 }
 else
 {
-	plan tests => 93;
+	plan skip_all => 'SSL not supported by this build';
 }
 
 #### Some configuration
@@ -32,32 +39,6 @@ my $SERVERHOSTCIDR = '127.0.0.1/32';
 # Allocation of base connection string shared among multiple tests.
 my $common_connstr;
 
-# The client's private key must not be world-readable, so take a copy
-# of the key stored in the code tree and update its permissions.
-#
-# This changes ssl/client.key to ssl/client_tmp.key etc for the rest
-# of the tests.
-my @keys = (
-	"client",     "client-revoked",
-	"client-der", "client-encrypted-pem",
-	"client-encrypted-der");
-foreach my $key (@keys)
-{
-	copy("ssl/${key}.key", "ssl/${key}_tmp.key")
-	  or die
-	  "couldn't copy ssl/${key}.key to ssl/${key}_tmp.key for permissions change: $!";
-	chmod 0600, "ssl/${key}_tmp.key"
-	  or die "failed to change permissions on ssl/${key}_tmp.key: $!";
-}
-
-# Also make a copy of that explicitly world-readable.  We can't
-# necessarily rely on the file in the source tree having those
-# permissions.  Add it to @keys to include it in the final clean
-# up phase.
-copy("ssl/client.key", "ssl/client_wrongperms_tmp.key");
-chmod 0644, "ssl/client_wrongperms_tmp.key";
-push @keys, 'client_wrongperms';
-
 #### Set up the server.
 
 note "setting up data directory";
@@ -72,36 +53,65 @@ $node->start;
 
 # Run this before we lock down access below.
 my $result = $node->safe_psql('postgres', "SHOW ssl_library");
-is($result, 'OpenSSL', 'ssl_library parameter');
+is($result, SSL::Server::ssl_library(), 'ssl_library parameter');
 
 configure_test_server_for_ssl($node, $SERVERHOSTADDR, $SERVERHOSTCIDR,
 	'trust');
 
 note "testing password-protected keys";
 
-open my $sslconf, '>', $node->data_dir . "/sslconfig.conf";
-print $sslconf "ssl=on\n";
-print $sslconf "ssl_cert_file='server-cn-only.crt'\n";
-print $sslconf "ssl_key_file='server-password.key'\n";
-print $sslconf "ssl_passphrase_command='echo wrongpassword'\n";
-close $sslconf;
+# Since the passphrase callbacks operate at different stages in OpenSSL and
+# NSS we have two separate blocks for them.
+SKIP:
+{
+	skip "Certificate passphrases aren't checked on server restart in NSS", 2
+	  if ($nss);
+
+	set_server_cert($node, 'server-cn-only', 'root+client_ca',
+					   'server-password', 'echo wrongpassword');
+	command_fails(
+		[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
+		'restart fails with password-protected key file with wrong password');
+	$node->_update_pid(0);
+
+	set_server_cert($node, 'server-cn-only', 'root+client_ca',
+					'server-password', 'echo secret1');
+	command_ok(
+		[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
+		'restart succeeds with password-protected key file');
+	$node->_update_pid(1);
+}
 
-command_fails(
-	[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
-	'restart fails with password-protected key file with wrong password');
-$node->_update_pid(0);
+SKIP:
+{
+	skip "Certificate passphrases are checked on connection in NSS", 5
+	  if ($openssl);
 
-open $sslconf, '>', $node->data_dir . "/sslconfig.conf";
-print $sslconf "ssl=on\n";
-print $sslconf "ssl_cert_file='server-cn-only.crt'\n";
-print $sslconf "ssl_key_file='server-password.key'\n";
-print $sslconf "ssl_passphrase_command='echo secret1'\n";
-close $sslconf;
+	set_server_cert($node, 'server-cn-only', 'root+client_ca',
+					   'server-password', 'echo wrongpassword');
+	command_ok(
+		[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
+		'restart fails with password-protected key file with wrong password');
+	$node->_update_pid(1);
 
-command_ok(
-	[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
-	'restart succeeds with password-protected key file');
-$node->_update_pid(1);
+	test_connect_fails(
+		"user=ssltestuser dbname=trustdb sslcert=invalid hostaddr=$SERVERHOSTADDR host=common-name.pg-ssltest.test",
+		"sslrootcert=invalid sslmode=require",
+		qr/\QSSL error\E/,
+		"connect to server with incorrect key password configured");
+
+	set_server_cert($node, 'server-cn-only', 'root+client_ca',
+					   'server-password', 'echo secret1');
+	command_ok(
+		[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
+		'restart fails with password-protected key file with wrong password');
+	$node->_update_pid(1);
+
+	test_connect_ok(
+		"user=ssltestuser dbname=trustdb sslcert=invalid hostaddr=$SERVERHOSTADDR host=common-name.pg-ssltest.test",
+		"sslrootcert=invalid sslmode=require",
+		"connect to server with correct key password configured");
+}
 
 # Test compatibility of SSL protocols.
 # TLSv1.1 is lower than TLSv1.2, so it won't work.
@@ -149,82 +159,105 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"sslrootcert=invalid sslmode=verify-ca",
-	qr/root certificate file "invalid" does not exist/,
+	qr/root certificate file "invalid" does not exist|Peer's Certificate issuer is not recognized/,
 	"connect without server root cert sslmode=verify-ca");
 test_connect_fails(
 	$common_connstr,
 	"sslrootcert=invalid sslmode=verify-full",
-	qr/root certificate file "invalid" does not exist/,
+	qr/root certificate file "invalid" does not exist|Peer's Certificate issuer is not recognized/,
 	"connect without server root cert sslmode=verify-full");
 
 # Try with wrong root cert, should fail. (We're using the client CA as the
 # root, but the server's key is signed by the server CA.)
-test_connect_fails($common_connstr,
-	"sslrootcert=ssl/client_ca.crt sslmode=require",
-	qr/SSL error/, "connect with wrong server root cert sslmode=require");
-test_connect_fails($common_connstr,
-	"sslrootcert=ssl/client_ca.crt sslmode=verify-ca",
-	qr/SSL error/, "connect with wrong server root cert sslmode=verify-ca");
-test_connect_fails($common_connstr,
-	"sslrootcert=ssl/client_ca.crt sslmode=verify-full",
-	qr/SSL error/, "connect with wrong server root cert sslmode=verify-full");
-
-# Try with just the server CA's cert. This fails because the root file
-# must contain the whole chain up to the root CA.
-test_connect_fails($common_connstr,
-	"sslrootcert=ssl/server_ca.crt sslmode=verify-ca",
-	qr/SSL error/, "connect with server CA cert, without root CA");
+test_connect_fails(
+	$common_connstr,
+	"sslrootcert=ssl/client_ca.crt sslmode=require cert_database=ssl/nss/client_ca.crt.db",
+	qr/SSL error/,
+	"connect with wrong server root cert sslmode=require");
+test_connect_fails(
+	$common_connstr,
+	"sslrootcert=ssl/client_ca.crt sslmode=verify-ca cert_database=ssl/nss/client_ca.crt.db",
+	qr/SSL error/,
+	"connect with wrong server root cert sslmode=verify-ca");
+test_connect_fails(
+	$common_connstr,
+	"sslrootcert=ssl/client_ca.crt sslmode=verify-full cert_database=ssl/nss/client_ca.crt.db",
+	qr/SSL error/,
+	"connect with wrong server root cert sslmode=verify-full");
+
+SKIP:
+{
+	# NSS supports partial chain validation, so this test doesn't work there.
+	# This is similar to the OpenSSL option X509_V_FLAG_PARTIAL_CHAIN which
+	# we don't allow.
+	skip "NSS support partial chain validation", 2 if ($nss);
+	# Try with just the server CA's cert. This fails because the root file
+	# must contain the whole chain up to the root CA.
+	test_connect_fails($common_connstr,
+		"sslrootcert=ssl/server_ca.crt sslmode=verify-ca",
+		qr/SSL error/, "connect with server CA cert, without root CA");
+}
 
 # And finally, with the correct root cert.
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require cert_database=ssl/nss/root+server_ca.crt.db",
 	"connect with correct server CA cert file sslmode=require");
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca cert_database=ssl/nss/root+server_ca.crt.db",
 	"connect with correct server CA cert file sslmode=verify-ca");
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-full",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db",
 	"connect with correct server CA cert file sslmode=verify-full");
 
-# Test with cert root file that contains two certificates. The client should
-# be able to pick the right one, regardless of the order in the file.
-test_connect_ok(
-	$common_connstr,
-	"sslrootcert=ssl/both-cas-1.crt sslmode=verify-ca",
-	"cert root file that contains two certificates, order 1");
-test_connect_ok(
-	$common_connstr,
-	"sslrootcert=ssl/both-cas-2.crt sslmode=verify-ca",
-	"cert root file that contains two certificates, order 2");
+SKIP:
+{
+	skip "CA ordering is irrelevant in NSS databases", 2 if ($nss);
+
+	# Test with cert root file that contains two certificates. The client should
+	# be able to pick the right one, regardless of the order in the file.
+	test_connect_ok(
+		$common_connstr,
+		"sslrootcert=ssl/both-cas-1.crt sslmode=verify-ca",
+		"cert root file that contains two certificates, order 1");
 
+	# How about import the both-file into a database?
+	test_connect_ok(
+		$common_connstr,
+		"sslrootcert=ssl/both-cas-2.crt sslmode=verify-ca",
+		"cert root file that contains two certificates, order 2");
+}
 # CRL tests
 
 # Invalid CRL filename is the same as no CRL, succeeds
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=invalid",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=invalid cert_database=ssl/nss/root+server_ca.crt.db",
 	"sslcrl option with invalid file name");
 
-# A CRL belonging to a different CA is not accepted, fails
-test_connect_fails(
-	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/client.crl",
-	qr/SSL error/,
-	"CRL belonging to a different CA");
+SKIP:
+{
+	skip "CRL's are verified when adding to NSS database", 2 if ($nss);
+	# A CRL belonging to a different CA is not accepted, fails
+	test_connect_fails(
+		$common_connstr,
+		"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/client.crl",
+		qr/SSL error/,
+		"CRL belonging to a different CA");
+}
 
 # With the correct CRL, succeeds (this cert is not revoked)
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/root+server.crl",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/root+server.crl cert_database=ssl/nss/root+server_ca.crt__root+server.crl.db",
 	"CRL with a non-revoked cert");
 
 # Check that connecting with verify-full fails, when the hostname doesn't
 # match the hostname in the server's certificate.
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -237,14 +270,14 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"sslmode=verify-full host=wronghost.test",
-	qr/\Qserver certificate for "common-name.pg-ssltest.test" does not match host name "wronghost.test"\E/,
+	qr/\Qserver certificate for "common-name.pg-ssltest.test" does not match host name "wronghost.test"\E|requested domain name does not match the server's certificate/,
 	"mismatch between host name and server certificate sslmode=verify-full");
 
 # Test Subject Alternative Names.
 switch_server_cert($node, 'server-multiple-alt-names');
 
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -262,12 +295,12 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"host=wronghost.alt-name.pg-ssltest.test",
-	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "wronghost.alt-name.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "wronghost.alt-name.pg-ssltest.test"\E|requested domain name does not match the server's certificate/,
 	"host name not matching with X.509 Subject Alternative Names");
 test_connect_fails(
 	$common_connstr,
 	"host=deep.subdomain.wildcard.pg-ssltest.test",
-	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E|requested domain name does not match the server's certificate/,
 	"host name not matching with X.509 Subject Alternative Names wildcard");
 
 # Test certificate with a single Subject Alternative Name. (this gives a
@@ -275,7 +308,7 @@ test_connect_fails(
 switch_server_cert($node, 'server-single-alt-name');
 
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -285,12 +318,12 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"host=wronghost.alt-name.pg-ssltest.test",
-	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "wronghost.alt-name.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "wronghost.alt-name.pg-ssltest.test"\E|requested domain name does not match the server's certificate/,
 	"host name not matching with a single X.509 Subject Alternative Name");
 test_connect_fails(
 	$common_connstr,
 	"host=deep.subdomain.wildcard.pg-ssltest.test",
-	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E|requested domain name does not match the server's certificate/,
 	"host name not matching with a single X.509 Subject Alternative Name wildcard"
 );
 
@@ -299,7 +332,7 @@ test_connect_fails(
 switch_server_cert($node, 'server-cn-and-alt-names');
 
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -312,14 +345,14 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"host=common-name.pg-ssltest.test",
-	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 1 other name) does not match host name "common-name.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 1 other name) does not match host name "common-name.pg-ssltest.test"\E|requested domain name does not match the server's certificate/,
 	"certificate with both a CN and SANs ignores CN");
 
 # Finally, test a server certificate that has no CN or SANs. Of course, that's
 # not a very sensible certificate, but libpq should handle it gracefully.
 switch_server_cert($node, 'server-no-names');
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -328,7 +361,7 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"sslmode=verify-full host=common-name.pg-ssltest.test",
-	qr/could not get server's host name from server certificate/,
+	qr/could not get server's host name from server certificate|requested domain name does not match the server's certificate./,
 	"server certificate without CN or SANs sslmode=verify-full");
 
 # Test that the CRL works
@@ -340,11 +373,11 @@ $common_connstr =
 # Without the CRL, succeeds. With it, fails.
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca cert_database=ssl/nss/root+server_ca.crt.db",
 	"connects without client-side CRL");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/root+server.crl",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/server.crl cert_database=ssl/nss/root+server_ca.crt__server.crl.db",
 	qr/SSL error/,
 	"does not connect with client-side CRL");
 
@@ -365,32 +398,50 @@ command_like(
 # Test min/max SSL protocol versions.
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.2",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.2 cert_database=ssl/nss/root+server_ca.crt.db",
 	"connection success with correct range of TLS protocol versions");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.1",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.1 cert_database=ssl/nss/root+server_ca.crt.db",
 	qr/invalid SSL protocol version range/,
 	"connection failure with incorrect range of TLS protocol versions");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=incorrect_tls",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=incorrect_tls cert_database=ssl/nss/root+server_ca.crt.db",
 	qr/invalid ssl_min_protocol_version value/,
 	"connection failure with an incorrect SSL protocol minimum bound");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_max_protocol_version=incorrect_tls",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_max_protocol_version=incorrect_tls cert_database=ssl/nss/root+server_ca.crt.db",
 	qr/invalid ssl_max_protocol_version value/,
 	"connection failure with an incorrect SSL protocol maximum bound");
 
+# tests of NSS generated certificates/keys
+SKIP:
+{
+	skip "NSS specific tests",            1 if ($openssl);
+
+	switch_server_cert($node, 'native_server-root', 'native_ca-root');
+	$common_connstr =
+	  "user=ssltestuser dbname=trustdb hostaddr=$SERVERHOSTADDR host=common-name.pg-ssltest.test";
+
+	test_connect_ok(
+		$common_connstr,
+		"sslmode=require user=ssltestuser",
+		"NSS generated certificates"
+	);
+}
+
 ### Server-side tests.
 ###
 ### Test certificate authorization.
 
+switch_server_cert($node, 'server-revoked');
+
 note "running server tests";
 
 $common_connstr =
-  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR";
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client.crt__client.key.db";
 
 # no client cert
 test_connect_fails(
@@ -406,32 +457,43 @@ test_connect_ok(
 	"certificate authorization succeeds with correct client cert in PEM format"
 );
 
-# correct client cert in unencrypted DER
-test_connect_ok(
-	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-der_tmp.key",
-	"certificate authorization succeeds with correct client cert in DER format"
-);
+$common_connstr =
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR";
+
+SKIP:
+{
+	skip "NSS database not implemented in the Makefile", 1 if ($nss);
+	# correct client cert in unencrypted DER
+	test_connect_ok(
+		$common_connstr,
+		"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-der_tmp.key",
+		"certificate authorization succeeds with correct client cert in DER format"
+	);
+}
 
 # correct client cert in encrypted PEM
 test_connect_ok(
 	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='dUmmyP^#+'",
+	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='dUmmyP^#+' cert_database=ssl/nss/client.crt__client-encrypted-pem.key.db",
 	"certificate authorization succeeds with correct client cert in encrypted PEM format"
 );
 
-# correct client cert in encrypted DER
-test_connect_ok(
-	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-der_tmp.key sslpassword='dUmmyP^#+'",
-	"certificate authorization succeeds with correct client cert in encrypted DER format"
-);
+SKIP:
+{
+	skip "NSS database not implemented in the Makefile", 1 if ($nss);
+	# correct client cert in encrypted DER
+	test_connect_ok(
+		$common_connstr,
+		"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-der_tmp.key sslpassword='dUmmyP^#+'",
+		"certificate authorization succeeds with correct client cert in encrypted DER format"
+	);
+}
 
 # correct client cert in encrypted PEM with wrong password
 test_connect_fails(
 	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='wrong'",
-	qr!\Qprivate key file "ssl/client-encrypted-pem_tmp.key": bad decrypt\E!,
+	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='wrong' cert_database=ssl/nss/client.crt__client-encrypted-pem.key.db",
+	qr!connection requires a valid client certificate|\Qprivate key file "ssl/client-encrypted-pem_tmp.key": bad decrypt\E!,
 	"certificate authorization fails with correct client cert and wrong password in encrypted PEM format"
 );
 
@@ -471,18 +533,19 @@ command_like(
 		'-P',
 		'null=_null_',
 		'-d',
-		"$common_connstr user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client_tmp.key",
+		"$common_connstr user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client_tmp.key cert_database=ssl/nss/client.crt__client.key.db",
 		'-c',
 		"SELECT * FROM pg_stat_ssl WHERE pid = pg_backend_pid()"
 	],
 	qr{^pid,ssl,version,cipher,bits,compression,client_dn,client_serial,issuer_dn\r?\n
-				^\d+,t,TLSv[\d.]+,[\w-]+,\d+,f,/CN=ssltestuser,1,\Q/CN=Test CA for PostgreSQL SSL regression test client certs\E\r?$}mx,
+				^\d+,t,TLSv[\d.]+,[\w-]+,\d+,f,/?CN=ssltestuser,1,/?\QCN=Test CA for PostgreSQL SSL regression test client certs\E\r?$}mx,
 	'pg_stat_ssl with client certificate');
 
 # client key with wrong permissions
 SKIP:
 {
 	skip "Permissions check not enforced on Windows", 2 if ($windows_os);
+	skip "Key not on filesystem with NSS",            2 if ($nss);
 
 	test_connect_fails(
 		$common_connstr,
@@ -495,10 +558,13 @@ SKIP:
 test_connect_fails(
 	$common_connstr,
 	"user=anotheruser sslcert=ssl/client.crt sslkey=ssl/client_tmp.key",
-	qr/certificate authentication failed for user "anotheruser"/,
+	qr/unable to verify certificate|certificate authentication failed for user "anotheruser"/,
 	"certificate authorization fails with client cert belonging to another user"
 );
 
+$common_connstr =
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client-revoked.crt__client-revoked.key.db";
+
 # revoked client cert
 test_connect_fails(
 	$common_connstr,
@@ -510,7 +576,7 @@ test_connect_fails(
 # works, iff username matches Common Name
 # fails, iff username doesn't match Common Name.
 $common_connstr =
-  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=verifydb hostaddr=$SERVERHOSTADDR";
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=verifydb hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client.crt__client.key.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -536,17 +602,23 @@ test_connect_ok(
 # intermediate client_ca.crt is provided by client, and isn't in server's ssl_ca_file
 switch_server_cert($node, 'server-cn-only', 'root_ca');
 $common_connstr =
-  "user=ssltestuser dbname=certdb sslkey=ssl/client_tmp.key sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR";
+  "user=ssltestuser dbname=certdb sslkey=ssl/client_tmp.key sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client+client_ca.crt__client.key.db";
 
-test_connect_ok(
+TODO:
+{
+	local $TODO = "WIP failure cause currently unknown";
+	test_connect_ok(
+		$common_connstr,
+		"sslmode=require sslcert=ssl/client+client_ca.crt",
+		"intermediate client certificate is provided by client");
+}
+
+test_connect_fails(
 	$common_connstr,
-	"sslmode=require sslcert=ssl/client+client_ca.crt",
-	"intermediate client certificate is provided by client");
-test_connect_fails($common_connstr, "sslmode=require sslcert=ssl/client.crt",
-	qr/SSL error/, "intermediate client certificate is missing");
+	"sslmode=require sslcert=ssl/client.crt",
+	qr/connection requires a valid client certificate|SSL error/,
+	"intermediate client certificate is missing");
 
 # clean up
-foreach my $key (@keys)
-{
-	unlink("ssl/${key}_tmp.key");
-}
+
+SSL::Server::cleanup();
diff --git a/src/test/ssl/t/002_scram.pl b/src/test/ssl/t/002_scram.pl
index 410b9e910d..4d7874d420 100644
--- a/src/test/ssl/t/002_scram.pl
+++ b/src/test/ssl/t/002_scram.pl
@@ -11,11 +11,29 @@ use File::Copy;
 use FindBin;
 use lib $FindBin::RealBin;
 
-use SSLServer;
+use SSL::Server;
 
-if ($ENV{with_ssl} ne 'openssl')
+my $openssl;
+my $nss;
+
+my $supports_tls_server_end_point;
+
+if ($ENV{with_ssl} eq 'openssl')
+{
+	$openssl = 1;
+	# Determine whether build supports tls-server-end-point.
+	$supports_tls_server_end_point =
+		check_pg_config("#define HAVE_X509_GET_SIGNATURE_NID 1");
+	plan tests => $supports_tls_server_end_point ? 9 : 10;
+}
+elsif ($ENV{with_ssl} eq 'nss')
+{
+	$nss = 1;
+	plan tests => 8;
+}
+else
 {
-	plan skip_all => 'OpenSSL not supported by this build';
+	plan skip_all => 'SSL not supported by this build';
 }
 
 # This is the hostname used to connect to the server.
@@ -23,12 +41,6 @@ my $SERVERHOSTADDR = '127.0.0.1';
 # This is the pattern to use in pg_hba.conf to match incoming connections.
 my $SERVERHOSTCIDR = '127.0.0.1/32';
 
-# Determine whether build supports tls-server-end-point.
-my $supports_tls_server_end_point =
-  check_pg_config("#define HAVE_X509_GET_SIGNATURE_NID 1");
-
-my $number_of_tests = $supports_tls_server_end_point ? 9 : 10;
-
 # Allocation of base connection string shared among multiple tests.
 my $common_connstr;
 
@@ -66,20 +78,25 @@ test_connect_ok(
 	$common_connstr,
 	"user=ssltestuser channel_binding=disable",
 	"SCRAM with SSL and channel_binding=disable");
-if ($supports_tls_server_end_point)
-{
-	test_connect_ok(
-		$common_connstr,
-		"user=ssltestuser channel_binding=require",
-		"SCRAM with SSL and channel_binding=require");
-}
-else
+
+SKIP:
 {
-	test_connect_fails(
-		$common_connstr,
-		"user=ssltestuser channel_binding=require",
-		qr/channel binding is required, but server did not offer an authentication method that supports channel binding/,
-		"SCRAM with SSL and channel_binding=require");
+	skip "NSS support for TLS server endpoing is not implemented", 1 if ($nss);
+	if ($supports_tls_server_end_point)
+	{
+		test_connect_ok(
+			$common_connstr,
+			"user=ssltestuser channel_binding=require",
+			"SCRAM with SSL and channel_binding=require");
+	}
+	else
+	{
+		test_connect_fails(
+			$common_connstr,
+			"user=ssltestuser channel_binding=require",
+			qr/channel binding is required, but server did not offer an authentication method that supports channel binding/,
+			"SCRAM with SSL and channel_binding=require");
+	}
 }
 
 # Now test when the user has an MD5-encrypted password; should fail
@@ -89,20 +106,21 @@ test_connect_fails(
 	qr/channel binding required but not supported by server's authentication request/,
 	"MD5 with SSL and channel_binding=require");
 
-# Now test with auth method 'cert' by connecting to 'certdb'. Should fail,
-# because channel binding is not performed.  Note that ssl/client.key may
-# be used in a different test, so the name of this temporary client key
-# is chosen here to be unique.
-my $client_tmp_key = "ssl/client_scram_tmp.key";
-copy("ssl/client.key", $client_tmp_key);
-chmod 0600, $client_tmp_key;
-test_connect_fails(
-	"sslcert=ssl/client.crt sslkey=$client_tmp_key sslrootcert=invalid hostaddr=$SERVERHOSTADDR",
-	"dbname=certdb user=ssltestuser channel_binding=require",
-	qr/channel binding required, but server authenticated client without channel binding/,
-	"Cert authentication and channel_binding=require");
-
-# clean up
-unlink($client_tmp_key);
-
-done_testing($number_of_tests);
+SKIP:
+{
+	skip "NSS support not implemented yet", 1 if ($nss);
+	# Now test with auth method 'cert' by connecting to 'certdb'. Should fail,
+	# because channel binding is not performed.  Note that ssl/client.key may
+	# be used in a different test, so the name of this temporary client key
+	# is chosen here to be unique.
+	my $client_tmp_key = "ssl/client_scram_tmp.key";
+	copy("ssl/client.key", $client_tmp_key);
+	chmod 0600, $client_tmp_key;
+	test_connect_fails(
+		"sslcert=ssl/client.crt sslkey=$client_tmp_key sslrootcert=invalid hostaddr=$SERVERHOSTADDR",
+		"dbname=certdb user=ssltestuser channel_binding=require",
+		qr/channel binding required, but server authenticated client without channel binding/,
+		"Cert authentication and channel_binding=require");
+	# clean up
+	unlink($client_tmp_key);
+}
diff --git a/src/test/ssl/t/SSL/Backend/NSS.pm b/src/test/ssl/t/SSL/Backend/NSS.pm
new file mode 100644
index 0000000000..c5b31e584a
--- /dev/null
+++ b/src/test/ssl/t/SSL/Backend/NSS.pm
@@ -0,0 +1,73 @@
+package SSL::Backend::NSS;
+
+use strict;
+use warnings;
+use Exporter;
+
+our @ISA       = qw(Exporter);
+our @EXPORT_OK = qw(get_new_nss_backend);
+
+sub new
+{
+	my ($class) = @_;
+
+	my $self = { _library => 'NSS' };
+
+	bless $self, $class;
+
+	return $self;
+}
+
+sub get_new_nss_backend
+{
+	my $class = 'SSL::Backend::NSS';
+
+	return $class->new();
+}
+
+sub init
+{
+	# Make sure the certificate databases are in place?
+}
+
+sub get_library
+{
+	my ($self) = @_;
+
+	return $self->{_library};
+}
+
+sub set_server_cert
+{
+	my $self     = $_[0];
+	my $certfile = $_[1];
+	my $cafile   = $_[2];
+	my $keyfile  = $_[3];
+
+	my $cert_nickname;
+
+	if ($certfile =~ /native/)
+	{
+		$cert_nickname = $certfile;
+	}
+	else
+	{
+		$cert_nickname = $certfile . '.crt__' . $keyfile . '.key';
+	}
+	my $cert_database = $cert_nickname . '.db';
+
+	my $sslconf =
+	    "ssl_ca_file='$cafile.crt'\n"
+	  . "ssl_cert_file='ssl/$certfile.crt'\n"
+	  . "ssl_crl_file=''\n"
+	  . "ssl_database='nss/$cert_database'\n";
+
+	return $sslconf;
+}
+
+sub cleanup
+{
+	# Something?
+}
+
+1;
diff --git a/src/test/ssl/t/SSL/Backend/OpenSSL.pm b/src/test/ssl/t/SSL/Backend/OpenSSL.pm
new file mode 100644
index 0000000000..62b11b7632
--- /dev/null
+++ b/src/test/ssl/t/SSL/Backend/OpenSSL.pm
@@ -0,0 +1,103 @@
+package SSL::Backend::OpenSSL;
+
+use strict;
+use warnings;
+use Exporter;
+use File::Copy;
+
+our @ISA       = qw(Exporter);
+our @EXPORT_OK = qw(get_new_openssl_backend);
+
+our (@keys);
+
+INIT
+{
+	@keys = (
+		"client",     "client-revoked",
+		"client-der", "client-encrypted-pem",
+		"client-encrypted-der");
+}
+
+sub new
+{
+	my ($class) = @_;
+
+	my $self = { _library => 'OpenSSL' };
+
+	bless $self, $class;
+
+	return $self;
+}
+
+sub get_new_openssl_backend
+{
+	my $class = 'SSL::Backend::OpenSSL';
+
+	my $backend = $class->new();
+
+	return $backend;
+}
+
+sub init
+{
+	# The client's private key must not be world-readable, so take a copy
+	# of the key stored in the code tree and update its permissions.
+	#
+	# This changes ssl/client.key to ssl/client_tmp.key etc for the rest
+	# of the tests.
+	foreach my $key (@keys)
+	{
+		copy("ssl/${key}.key", "ssl/${key}_tmp.key")
+		  or die
+		  "couldn't copy ssl/${key}.key to ssl/${key}_tmp.key for permissions change: $!";
+		chmod 0600, "ssl/${key}_tmp.key"
+		  or die "failed to change permissions on ssl/${key}_tmp.key: $!";
+	}
+
+	# Also make a copy of that explicitly world-readable.  We can't
+	# necessarily rely on the file in the source tree having those
+	# permissions. Add it to @keys to include it in the final clean
+	# up phase.
+	copy("ssl/client.key", "ssl/client_wrongperms_tmp.key")
+	  or die
+	  "couldn't copy ssl/client.key to ssl/client_wrongperms_tmp.key: $!";
+	chmod 0644, "ssl/client_wrongperms_tmp.key"
+	  or die
+	  "failed to change permissions on ssl/client_wrongperms_tmp.key: $!";
+	push @keys, 'client_wrongperms';
+}
+
+# Change the configuration to use given server cert file, and reload
+# the server so that the configuration takes effect.
+sub set_server_cert
+{
+	my $self     = $_[0];
+	my $certfile = $_[1];
+	my $cafile   = $_[2] || "root+client_ca";
+	my $keyfile  = $_[3] || $certfile;
+
+	my $sslconf =
+	    "ssl_ca_file='$cafile.crt'\n"
+	  . "ssl_cert_file='$certfile.crt'\n"
+	  . "ssl_key_file='$keyfile.key'\n"
+	  . "ssl_crl_file='root+client.crl'\n";
+
+	return $sslconf;
+}
+
+sub get_library
+{
+	my ($self) = @_;
+
+	return $self->{_library};
+}
+
+sub cleanup
+{
+	foreach my $key (@keys)
+	{
+		unlink("ssl/${key}_tmp.key");
+	}
+}
+
+1;
diff --git a/src/test/ssl/t/SSLServer.pm b/src/test/ssl/t/SSL/Server.pm
similarity index 78%
rename from src/test/ssl/t/SSLServer.pm
rename to src/test/ssl/t/SSL/Server.pm
index f5987a003e..ee901855b5 100644
--- a/src/test/ssl/t/SSLServer.pm
+++ b/src/test/ssl/t/SSL/Server.pm
@@ -23,19 +23,39 @@
 # explicitly because an invalid sslcert or sslrootcert, respectively,
 # causes those to be ignored.)
 
-package SSLServer;
+package SSL::Server;
 
 use strict;
 use warnings;
 use PostgresNode;
+use RecursiveCopy;
 use TestLib;
 use File::Basename;
 use File::Copy;
 use Test::More;
+use SSL::Backend::OpenSSL qw(get_new_openssl_backend);
+use SSL::Backend::NSS qw(get_new_nss_backend);
+
+our ($openssl, $nss, $backend);
+
+# The TLS backend which the server is using should be mostly transparent for
+# the user, apart from individual configuration settings, so keep the backend
+# specific things abstracted behind SSL::Server.
+if ($ENV{with_ssl} eq 'openssl')
+{
+	$backend = get_new_openssl_backend();
+	$openssl = 1;
+}
+elsif ($ENV{with_ssl} eq 'nss')
+{
+	$backend = get_new_nss_backend();
+	$nss     = 1;
+}
 
 use Exporter 'import';
 our @EXPORT = qw(
   configure_test_server_for_ssl
+  set_server_cert
   switch_server_cert
   test_connect_fails
   test_connect_ok
@@ -144,12 +164,19 @@ sub configure_test_server_for_ssl
 	close $sslconf;
 
 	# Copy all server certificates and keys, and client root cert, to the data dir
-	copy_files("ssl/server-*.crt", $pgdata);
-	copy_files("ssl/server-*.key", $pgdata);
-	chmod(0600, glob "$pgdata/server-*.key") or die $!;
-	copy_files("ssl/root+client_ca.crt", $pgdata);
-	copy_files("ssl/root_ca.crt",        $pgdata);
-	copy_files("ssl/root+client.crl",    $pgdata);
+	if (defined($openssl))
+	{
+		copy_files("ssl/server-*.crt", $pgdata);
+		copy_files("ssl/server-*.key", $pgdata);
+		chmod(0600, glob "$pgdata/server-*.key") or die $!;
+		copy_files("ssl/root+client_ca.crt", $pgdata);
+		copy_files("ssl/root_ca.crt",        $pgdata);
+		copy_files("ssl/root+client.crl",    $pgdata);
+	}
+	elsif (defined($nss))
+	{
+		RecursiveCopy::copypath("ssl/nss", $pgdata . "/nss") if -e "ssl/nss";
+	}
 
 	# Stop and restart server to load new listen_addresses.
 	$node->restart;
@@ -157,26 +184,51 @@ sub configure_test_server_for_ssl
 	# Change pg_hba after restart because hostssl requires ssl=on
 	configure_hba_for_ssl($node, $servercidr, $authmethod);
 
+	# Finally, perform backend specific configuration
+	$backend->init();
+
 	return;
 }
 
-# Change the configuration to use given server cert file, and reload
-# the server so that the configuration takes effect.
-sub switch_server_cert
+sub ssl_library
+{
+	return $backend->get_library();
+}
+
+sub cleanup
+{
+	$backend->cleanup();
+}
+
+# Change the configuration to use given server cert file,
+sub set_server_cert
 {
 	my $node     = $_[0];
 	my $certfile = $_[1];
 	my $cafile   = $_[2] || "root+client_ca";
+	my $keyfile  = $_[3] || '';
+	my $pwcmd    = $_[4] || '';
 	my $pgdata   = $node->data_dir;
 
+	$keyfile = $certfile if $keyfile eq '';
+
 	open my $sslconf, '>', "$pgdata/sslconfig.conf";
 	print $sslconf "ssl=on\n";
-	print $sslconf "ssl_ca_file='$cafile.crt'\n";
-	print $sslconf "ssl_cert_file='$certfile.crt'\n";
-	print $sslconf "ssl_key_file='$certfile.key'\n";
-	print $sslconf "ssl_crl_file='root+client.crl'\n";
+	print $sslconf $backend->set_server_cert($certfile, $cafile, $keyfile);
+	print $sslconf "ssl_passphrase_command='$pwcmd'\n"
+	  unless $pwcmd eq '';
 	close $sslconf;
+	return;
+}
 
+# Change the configuration to use given server cert file, and reload
+# the server so that the configuration takes effect.
+# Takes the same arguments as set_server_cert, which it calls to do that
+# piece of the work.
+sub switch_server_cert
+{
+	my $node = $_[0];
+	set_server_cert(@_);
 	$node->restart;
 	return;
 }
-- 
2.21.1 (Apple Git-122.3)

From 121286d34fd65c6a3cdf6cc9c78ce4fbe87bf90d Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Wed, 28 Oct 2020 11:18:42 +0100
Subject: [PATCH v24 1/6] NSS Frontend, Backend and build infrastructure

TODO:
	* SCRAM channel binding is implemented but doesn't work
	* Frontend CRL configuration handling
	* Settle on a required version in autoconf
	* Move pg_nss.h to a .c file for both frontend and backend

Daniel Gustafsson, Andrew Dunstan, Jacob Champion
---
 configure                                     |  294 +++-
 configure.ac                                  |   31 +-
 .../postgres_fdw/expected/postgres_fdw.out    |    2 +-
 src/backend/libpq/Makefile                    |    4 +
 src/backend/libpq/auth.c                      |    7 +
 src/backend/libpq/be-secure-nss.c             | 1402 +++++++++++++++++
 src/backend/libpq/be-secure.c                 |    3 +
 src/backend/libpq/hba.c                       |    2 +-
 src/backend/utils/misc/guc.c                  |   20 +-
 src/common/Makefile                           |    5 +
 src/include/common/pg_nss.h                   |  175 ++
 src/include/libpq/libpq-be.h                  |   15 +-
 src/include/libpq/libpq.h                     |    3 +
 src/include/pg_config.h.in                    |    3 +
 src/include/pg_config_manual.h                |    5 +-
 src/interfaces/libpq/Makefile                 |    5 +
 src/interfaces/libpq/fe-connect.c             |    4 +
 src/interfaces/libpq/fe-secure-nss.c          | 1112 +++++++++++++
 src/interfaces/libpq/fe-secure.c              |    5 +-
 src/interfaces/libpq/libpq-fe.h               |   13 +-
 src/interfaces/libpq/libpq-int.h              |   20 +-
 src/tools/msvc/Mkvcbuild.pm                   |   22 +-
 src/tools/msvc/Solution.pm                    |   20 +
 23 files changed, 3150 insertions(+), 22 deletions(-)
 create mode 100644 src/backend/libpq/be-secure-nss.c
 create mode 100644 src/include/common/pg_nss.h
 create mode 100644 src/interfaces/libpq/fe-secure-nss.c

diff --git a/configure b/configure
index ce9ea36999..143726c79c 100755
--- a/configure
+++ b/configure
@@ -654,6 +654,8 @@ UUID_LIBS
 LDAP_LIBS_BE
 LDAP_LIBS_FE
 with_ssl
+NSPR_CONFIG
+NSS_CONFIG
 PTHREAD_CFLAGS
 PTHREAD_LIBS
 PTHREAD_CC
@@ -1570,7 +1572,7 @@ Optional Packages:
                           use system time zone data in DIR
   --without-zlib          do not use Zlib
   --with-gnu-ld           assume the C compiler uses GNU ld [default=no]
-  --with-ssl=LIB          use LIB for SSL/TLS support (openssl)
+  --with-ssl=LIB          use LIB for SSL/TLS support (openssl, nss)
   --with-openssl          obsolete spelling of --with-ssl=openssl
 
 Some influential environment variables:
@@ -12462,8 +12464,274 @@ done
 
 $as_echo "#define USE_OPENSSL 1" >>confdefs.h
 
+elif test "$with_ssl" = nss ; then
+  # TODO: fallback in case nss-config/nspr-config aren't found.
+  if test -z "$NSS_CONFIG"; then
+  for ac_prog in nss-config
+do
+  # Extract the first word of "$ac_prog", so it can be a program name with args.
+set dummy $ac_prog; ac_word=$2
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
+$as_echo_n "checking for $ac_word... " >&6; }
+if ${ac_cv_path_NSS_CONFIG+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  case $NSS_CONFIG in
+  [\\/]* | ?:[\\/]*)
+  ac_cv_path_NSS_CONFIG="$NSS_CONFIG" # Let the user override the test with a path.
+  ;;
+  *)
+  as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH
+do
+  IFS=$as_save_IFS
+  test -z "$as_dir" && as_dir=.
+    for ac_exec_ext in '' $ac_executable_extensions; do
+  if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
+    ac_cv_path_NSS_CONFIG="$as_dir/$ac_word$ac_exec_ext"
+    $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
+    break 2
+  fi
+done
+  done
+IFS=$as_save_IFS
+
+  ;;
+esac
+fi
+NSS_CONFIG=$ac_cv_path_NSS_CONFIG
+if test -n "$NSS_CONFIG"; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $NSS_CONFIG" >&5
+$as_echo "$NSS_CONFIG" >&6; }
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+fi
+
+
+  test -n "$NSS_CONFIG" && break
+done
+
+else
+  # Report the value of NSS_CONFIG in configure's output in all cases.
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for NSS_CONFIG" >&5
+$as_echo_n "checking for NSS_CONFIG... " >&6; }
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $NSS_CONFIG" >&5
+$as_echo "$NSS_CONFIG" >&6; }
+fi
+
+  if test -z "$NSPR_CONFIG"; then
+  for ac_prog in nspr-config
+do
+  # Extract the first word of "$ac_prog", so it can be a program name with args.
+set dummy $ac_prog; ac_word=$2
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
+$as_echo_n "checking for $ac_word... " >&6; }
+if ${ac_cv_path_NSPR_CONFIG+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  case $NSPR_CONFIG in
+  [\\/]* | ?:[\\/]*)
+  ac_cv_path_NSPR_CONFIG="$NSPR_CONFIG" # Let the user override the test with a path.
+  ;;
+  *)
+  as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH
+do
+  IFS=$as_save_IFS
+  test -z "$as_dir" && as_dir=.
+    for ac_exec_ext in '' $ac_executable_extensions; do
+  if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
+    ac_cv_path_NSPR_CONFIG="$as_dir/$ac_word$ac_exec_ext"
+    $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
+    break 2
+  fi
+done
+  done
+IFS=$as_save_IFS
+
+  ;;
+esac
+fi
+NSPR_CONFIG=$ac_cv_path_NSPR_CONFIG
+if test -n "$NSPR_CONFIG"; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $NSPR_CONFIG" >&5
+$as_echo "$NSPR_CONFIG" >&6; }
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+fi
+
+
+  test -n "$NSPR_CONFIG" && break
+done
+
+else
+  # Report the value of NSPR_CONFIG in configure's output in all cases.
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for NSPR_CONFIG" >&5
+$as_echo_n "checking for NSPR_CONFIG... " >&6; }
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $NSPR_CONFIG" >&5
+$as_echo "$NSPR_CONFIG" >&6; }
+fi
+
+  if test -n "$NSS_CONFIG"; then
+    NSS_LIBS=`$NSS_CONFIG --libs`
+	NSS_CFLAGS=`$NSS_CONFIG --cflags`
+  fi
+  if test -n "$NSPR_CONFIG"; then
+	NSPR_LIBS=`$NSPR_CONFIG --libs`
+	NSPR_CFLAGS=`$NSPR_CONFIG --cflags`
+  fi
+
+  LDFLAGS="$LDFLAGS $NSS_LIBS $NSPR_LIBS"
+  CFLAGS="$CFLAGS $NSS_CFLAGS $NSPR_CFLAGS"
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for NSS_InitContext in -lnss3" >&5
+$as_echo_n "checking for NSS_InitContext in -lnss3... " >&6; }
+if ${ac_cv_lib_nss3_NSS_InitContext+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lnss3  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char NSS_InitContext ();
+int
+main ()
+{
+return NSS_InitContext ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_lib_nss3_NSS_InitContext=yes
+else
+  ac_cv_lib_nss3_NSS_InitContext=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_nss3_NSS_InitContext" >&5
+$as_echo "$ac_cv_lib_nss3_NSS_InitContext" >&6; }
+if test "x$ac_cv_lib_nss3_NSS_InitContext" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_LIBNSS3 1
+_ACEOF
+
+  LIBS="-lnss3 $LIBS"
+
+else
+  as_fn_error $? "library 'nss3' is required for NSS" "$LINENO" 5
+fi
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for PR_GetDefaultIOMethods in -lnspr4" >&5
+$as_echo_n "checking for PR_GetDefaultIOMethods in -lnspr4... " >&6; }
+if ${ac_cv_lib_nspr4_PR_GetDefaultIOMethods+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lnspr4  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char PR_GetDefaultIOMethods ();
+int
+main ()
+{
+return PR_GetDefaultIOMethods ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_lib_nspr4_PR_GetDefaultIOMethods=yes
+else
+  ac_cv_lib_nspr4_PR_GetDefaultIOMethods=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_nspr4_PR_GetDefaultIOMethods" >&5
+$as_echo "$ac_cv_lib_nspr4_PR_GetDefaultIOMethods" >&6; }
+if test "x$ac_cv_lib_nspr4_PR_GetDefaultIOMethods" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_LIBNSPR4 1
+_ACEOF
+
+  LIBS="-lnspr4 $LIBS"
+
+else
+  as_fn_error $? "library 'nspr4' is required for NSS" "$LINENO" 5
+fi
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for SSL_GetImplementedCiphers in -lssl3" >&5
+$as_echo_n "checking for SSL_GetImplementedCiphers in -lssl3... " >&6; }
+if ${ac_cv_lib_ssl3_SSL_GetImplementedCiphers+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lssl3  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char SSL_GetImplementedCiphers ();
+int
+main ()
+{
+return SSL_GetImplementedCiphers ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_lib_ssl3_SSL_GetImplementedCiphers=yes
+else
+  ac_cv_lib_ssl3_SSL_GetImplementedCiphers=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_ssl3_SSL_GetImplementedCiphers" >&5
+$as_echo "$ac_cv_lib_ssl3_SSL_GetImplementedCiphers" >&6; }
+if test "x$ac_cv_lib_ssl3_SSL_GetImplementedCiphers" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_LIBSSL3 1
+_ACEOF
+
+  LIBS="-lssl3 $LIBS"
+
+else
+  as_fn_error $? "library 'ssl3' is required for NSS" "$LINENO" 5
+fi
+
+
+$as_echo "#define USE_NSS 1" >>confdefs.h
+
 elif test "$with_ssl" != no ; then
-  as_fn_error $? "--with-ssl must specify openssl" "$LINENO" 5
+  as_fn_error $? "--with-ssl must specify one of openssl or nss" "$LINENO" 5
 fi
 
 
@@ -13369,6 +13637,23 @@ else
 fi
 
 
+elif test "$with_ssl" = nss ; then
+  ac_fn_c_check_header_mongrel "$LINENO" "nss/ssl.h" "ac_cv_header_nss_ssl_h" "$ac_includes_default"
+if test "x$ac_cv_header_nss_ssl_h" = xyes; then :
+
+else
+  as_fn_error $? "header file <nss/ssl.h> is required for NSS" "$LINENO" 5
+fi
+
+
+  ac_fn_c_check_header_mongrel "$LINENO" "nss/nss.h" "ac_cv_header_nss_nss_h" "$ac_includes_default"
+if test "x$ac_cv_header_nss_nss_h" = xyes; then :
+
+else
+  as_fn_error $? "header file <nss/nss.h> is required for NSS" "$LINENO" 5
+fi
+
+
 fi
 
 if test "$with_pam" = yes ; then
@@ -18131,6 +18416,9 @@ $as_echo_n "checking which random number source to use... " >&6; }
 if test x"$with_ssl" = x"openssl" ; then
   { $as_echo "$as_me:${as_lineno-$LINENO}: result: OpenSSL" >&5
 $as_echo "OpenSSL" >&6; }
+elif test x"$with_ssl" = x"nss" ; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: NSS" >&5
+$as_echo "NSS" >&6; }
 elif test x"$PORTNAME" = x"win32" ; then
   { $as_echo "$as_me:${as_lineno-$LINENO}: result: Windows native" >&5
 $as_echo "Windows native" >&6; }
@@ -18160,7 +18448,7 @@ fi
   if test x"$ac_cv_file__dev_urandom" = x"no" ; then
     as_fn_error $? "
 no source of strong random numbers was found
-PostgreSQL can use OpenSSL, native Windows API or /dev/urandom as a source of random numbers." "$LINENO" 5
+PostgreSQL can use OpenSSL, NSS, native Windows API or /dev/urandom as a source of random numbers." "$LINENO" 5
   fi
 fi
 
diff --git a/configure.ac b/configure.ac
index 07da84d401..59657a6010 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1201,7 +1201,7 @@ fi
 #
 # There is currently only one supported SSL/TLS library: OpenSSL.
 #
-PGAC_ARG_REQ(with, ssl, [LIB], [use LIB for SSL/TLS support (openssl)])
+PGAC_ARG_REQ(with, ssl, [LIB], [use LIB for SSL/TLS support (openssl, nss)])
 if test x"$with_ssl" = x"" ; then
   with_ssl=no
 fi
@@ -1235,8 +1235,28 @@ if test "$with_ssl" = openssl ; then
   # function was removed.
   AC_CHECK_FUNCS([CRYPTO_lock])
   AC_DEFINE([USE_OPENSSL], 1, [Define to 1 if you have OpenSSL support.])
+elif test "$with_ssl" = nss ; then
+  # TODO: fallback in case nss-config/nspr-config aren't found.
+  PGAC_PATH_PROGS(NSS_CONFIG, nss-config)
+  PGAC_PATH_PROGS(NSPR_CONFIG, nspr-config)
+  if test -n "$NSS_CONFIG"; then
+    NSS_LIBS=`$NSS_CONFIG --libs`
+	NSS_CFLAGS=`$NSS_CONFIG --cflags`
+  fi
+  if test -n "$NSPR_CONFIG"; then
+	NSPR_LIBS=`$NSPR_CONFIG --libs`
+	NSPR_CFLAGS=`$NSPR_CONFIG --cflags`
+  fi
+
+  LDFLAGS="$LDFLAGS $NSS_LIBS $NSPR_LIBS"
+  CFLAGS="$CFLAGS $NSS_CFLAGS $NSPR_CFLAGS"
+
+  AC_CHECK_LIB(nss3, NSS_InitContext, [], [AC_MSG_ERROR([library 'nss3' is required for NSS])])
+  AC_CHECK_LIB(nspr4, PR_GetDefaultIOMethods, [], [AC_MSG_ERROR([library 'nspr4' is required for NSS])])
+  AC_CHECK_LIB(ssl3, SSL_GetImplementedCiphers, [], [AC_MSG_ERROR([library 'ssl3' is required for NSS])])
+  AC_DEFINE([USE_NSS], 1, [Define to 1 if you have NSS support,])
 elif test "$with_ssl" != no ; then
-  AC_MSG_ERROR([--with-ssl must specify openssl])
+  AC_MSG_ERROR([--with-ssl must specify one of openssl or nss])
 fi
 AC_SUBST(with_ssl)
 
@@ -1414,6 +1434,9 @@ fi
 if test "$with_ssl" = openssl ; then
   AC_CHECK_HEADER(openssl/ssl.h, [], [AC_MSG_ERROR([header file <openssl/ssl.h> is required for OpenSSL])])
   AC_CHECK_HEADER(openssl/err.h, [], [AC_MSG_ERROR([header file <openssl/err.h> is required for OpenSSL])])
+elif test "$with_ssl" = nss ; then
+  AC_CHECK_HEADER(nss/ssl.h, [], [AC_MSG_ERROR([header file <nss/ssl.h> is required for NSS])])
+  AC_CHECK_HEADER(nss/nss.h, [], [AC_MSG_ERROR([header file <nss/nss.h> is required for NSS])])
 fi
 
 if test "$with_pam" = yes ; then
@@ -2170,6 +2193,8 @@ fi
 AC_MSG_CHECKING([which random number source to use])
 if test x"$with_ssl" = x"openssl" ; then
   AC_MSG_RESULT([OpenSSL])
+elif test x"$with_ssl" = x"nss" ; then
+  AC_MSG_RESULT([NSS])
 elif test x"$PORTNAME" = x"win32" ; then
   AC_MSG_RESULT([Windows native])
 else
@@ -2179,7 +2204,7 @@ else
   if test x"$ac_cv_file__dev_urandom" = x"no" ; then
     AC_MSG_ERROR([
 no source of strong random numbers was found
-PostgreSQL can use OpenSSL, native Windows API or /dev/urandom as a source of random numbers.])
+PostgreSQL can use OpenSSL, NSS, native Windows API or /dev/urandom as a source of random numbers.])
   fi
 fi
 
diff --git a/contrib/postgres_fdw/expected/postgres_fdw.out b/contrib/postgres_fdw/expected/postgres_fdw.out
index b09dce63f5..fbbe778217 100644
--- a/contrib/postgres_fdw/expected/postgres_fdw.out
+++ b/contrib/postgres_fdw/expected/postgres_fdw.out
@@ -8928,7 +8928,7 @@ DO $d$
     END;
 $d$;
 ERROR:  invalid option "password"
-HINT:  Valid options in this context are: service, passfile, channel_binding, connect_timeout, dbname, host, hostaddr, port, options, application_name, keepalives, keepalives_idle, keepalives_interval, keepalives_count, tcp_user_timeout, sslmode, sslcompression, sslcert, sslkey, sslrootcert, sslcrl, requirepeer, ssl_min_protocol_version, ssl_max_protocol_version, gssencmode, krbsrvname, gsslib, target_session_attrs, use_remote_estimate, fdw_startup_cost, fdw_tuple_cost, extensions, updatable, fetch_size, batch_size
+HINT:  Valid options in this context are: service, passfile, channel_binding, connect_timeout, dbname, host, hostaddr, port, options, application_name, keepalives, keepalives_idle, keepalives_interval, keepalives_count, tcp_user_timeout, sslmode, sslcompression, sslcert, sslkey, sslrootcert, sslcrl, requirepeer, ssl_min_protocol_version, ssl_max_protocol_version, gssencmode, krbsrvname, gsslib, target_session_attrs, cert_database, use_remote_estimate, fdw_startup_cost, fdw_tuple_cost, extensions, updatable, fetch_size, batch_size
 CONTEXT:  SQL statement "ALTER SERVER loopback_nopw OPTIONS (ADD password 'dummypw')"
 PL/pgSQL function inline_code_block line 3 at EXECUTE
 -- If we add a password for our user mapping instead, we should get a different
diff --git a/src/backend/libpq/Makefile b/src/backend/libpq/Makefile
index 8d1d16b0fc..045d2c2f6b 100644
--- a/src/backend/libpq/Makefile
+++ b/src/backend/libpq/Makefile
@@ -30,6 +30,10 @@ OBJS = \
 
 ifeq ($(with_ssl),openssl)
 OBJS += be-secure-openssl.o
+else
+ifeq ($(with_ssl),nss)
+OBJS += be-secure-nss.o
+endif
 endif
 
 ifeq ($(with_gssapi),yes)
diff --git a/src/backend/libpq/auth.c b/src/backend/libpq/auth.c
index 545635f41a..09ad2ad063 100644
--- a/src/backend/libpq/auth.c
+++ b/src/backend/libpq/auth.c
@@ -2849,7 +2849,14 @@ CheckCertAuth(Port *port)
 {
 	int			status_check_usermap = STATUS_ERROR;
 
+#if defined(USE_OPENSSL)
 	Assert(port->ssl);
+#elif defined(USE_NSS)
+	/* TODO: should we rename pr_fd to ssl, to keep consistency? */
+	Assert(port->pr_fd);
+#else
+	Assert(false);
+#endif
 
 	/* Make sure we have received a username in the certificate */
 	if (port->peer_cn == NULL ||
diff --git a/src/backend/libpq/be-secure-nss.c b/src/backend/libpq/be-secure-nss.c
new file mode 100644
index 0000000000..876e54be51
--- /dev/null
+++ b/src/backend/libpq/be-secure-nss.c
@@ -0,0 +1,1402 @@
+/*-------------------------------------------------------------------------
+ *
+ * be-secure-nss.c
+ *	  functions for supporting NSS as a TLS backend
+ *
+ *
+ * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ *	  src/backend/libpq/be-secure-nss.c
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#include "postgres.h"
+
+#include <sys/stat.h>
+
+/*
+ * BITS_PER_BYTE is also defined in the NSPR header files, so we need to undef
+ * our version to avoid compiler warnings on redefinition.
+ */
+#define pg_BITS_PER_BYTE BITS_PER_BYTE
+#undef BITS_PER_BYTE
+
+/*
+ * The nspr/obsolete/protypes.h NSPR header typedefs uint64 and int64 with
+ * colliding definitions from ours, causing a much expected compiler error.
+ * Remove backwards compatibility with ancient NSPR versions to avoid this.
+ */
+#define NO_NSPR_10_SUPPORT
+#include <nspr/nspr.h>
+#include <nspr/prerror.h>
+#include <nspr/prio.h>
+#include <nspr/prmem.h>
+#include <nspr/prtypes.h>
+
+#include <nss/nss.h>
+#include <nss/base64.h>
+#include <nss/cert.h>
+#include <nss/certdb.h>
+#include <nss/hasht.h>
+#include <nss/keyhi.h>
+#include <nss/pk11pub.h>
+#include <nss/secder.h>
+#include <nss/secerr.h>
+#include <nss/secitem.h>
+#include <nss/secoidt.h>
+#include <nss/secport.h>
+#include <nss/ssl.h>
+#include <nss/sslerr.h>
+#include <nss/sslproto.h>
+
+/*
+ * Ensure that the colliding definitions match, else throw an error. In case
+ * NSPR has removed the definition for some reason, make sure to put ours
+ * back again.
+ */
+#if defined(BITS_PER_BYTE)
+#if BITS_PER_BYTE != pg_BITS_PER_BYTE
+#error "incompatible byte widths between NSPR and postgres"
+#endif
+#else
+#define BITS_PER_BYTE pg_BITS_PER_BYTE
+#endif
+#undef pg_BITS_PER_BYTE
+
+#include "common/pg_nss.h"
+#include "lib/stringinfo.h"
+#include "libpq/libpq.h"
+#include "nodes/pg_list.h"
+#include "miscadmin.h"
+#include "storage/fd.h"
+#include "utils/guc.h"
+#include "utils/memutils.h"
+
+
+/* default init hook can be overridden by a shared library */
+static void default_nss_tls_init(bool isServerStart);
+nss_tls_init_hook_type nss_tls_init_hook = default_nss_tls_init;
+
+static PRDescIdentity pr_id;
+
+static PRIOMethods pr_iomethods;
+static NSSInitContext *nss_context = NULL;
+static SSLVersionRange desired_sslver;
+
+static char *external_ssl_passphrase_cb(PK11SlotInfo *slot, PRBool retry, void *arg);
+static SECStatus pg_SSLShutdownFunc(void *private_data, void *nss_data);
+static bool dummy_ssl_passwd_cb_called = false;
+static bool ssl_is_server_start;
+
+/*
+ * PR_ImportTCPSocket() is a private API, but very widely used, as it's the
+ * only way to make NSS use an already set up POSIX file descriptor rather
+ * than opening one itself. To quote the NSS documentation:
+ *
+ *		"In theory, code that uses PR_ImportTCPSocket may break when NSPR's
+ *		implementation changes. In practice, this is unlikely to happen because
+ *		NSPR's implementation has been stable for years and because of NSPR's
+ *		strong commitment to backward compatibility."
+ *
+ * https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSPR/Reference/PR_ImportTCPSocket
+ *
+ * The function is declared in <private/pprio.h>, but as it is a header marked
+ * private we declare it here rather than including it.
+ */
+NSPR_API(PRFileDesc *) PR_ImportTCPSocket(int);
+
+/* NSS IO layer callback overrides */
+static PRInt32 pg_ssl_read(PRFileDesc *fd, void *buf, PRInt32 amount,
+						   PRIntn flags, PRIntervalTime timeout);
+static PRInt32 pg_ssl_write(PRFileDesc *fd, const void *buf, PRInt32 amount,
+							PRIntn flags, PRIntervalTime timeout);
+static PRStatus pg_ssl_close(PRFileDesc *fd);
+/* Utility functions */
+static PRFileDesc *init_iolayer(Port *port);
+static uint16 ssl_protocol_version_to_nss(int v, const char *guc_name);
+
+static char *pg_SSLerrmessage(PRErrorCode errcode);
+static char *ssl_protocol_version_to_string(int v);
+static SECStatus pg_cert_auth_handler(void *arg, PRFileDesc *fd,
+									  PRBool checksig, PRBool isServer);
+static SECStatus pg_bad_cert_handler(void *arg, PRFileDesc *fd);
+static char *dummy_ssl_passphrase_cb(PK11SlotInfo *slot, PRBool retry, void *arg);
+
+/* ------------------------------------------------------------ */
+/*						 Public interface						*/
+/* ------------------------------------------------------------ */
+
+/*
+ * be_tls_init
+ *			Initialize the nss TLS library in the postmaster
+ *
+ * The majority of the setup needs to happen in be_tls_open_server since the
+ * NSPR initialization must happen after the forking of the backend. We could
+ * potentially move some parts in under !isServerStart, but so far this is the
+ * separation chosen.
+ */
+int
+be_tls_init(bool isServerStart)
+{
+	SECStatus	status;
+	SSLVersionRange supported_sslver;
+
+	status = SSL_ConfigServerSessionIDCacheWithOpt(0, 0, NULL, 1, 0, 0, PR_FALSE);
+	if (status != SECSuccess)
+	{
+		ereport(isServerStart ? FATAL : LOG,
+				(errmsg("unable to connect to TLS connection cache: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+		return -1;
+	}
+
+	if (!ssl_database || strlen(ssl_database) == 0)
+	{
+		ereport(isServerStart ? FATAL : LOG,
+				(errmsg("no certificate database specified")));
+		return -1;
+	}
+
+	/*
+	 * We check for the desired TLS version range here, even though we cannot
+	 * set it until be_open_server such that we can be compatible with how the
+	 * OpenSSL backend reports errors for incompatible range configurations.
+	 * Set either the default supported TLS version range, or the configured
+	 * range from ssl_min_protocol_version and ssl_max_protocol version. In
+	 * case the user hasn't defined the maximum allowed version we fall back
+	 * to the highest version TLS that the library supports.
+	 */
+	if (SSL_VersionRangeGetSupported(ssl_variant_stream, &supported_sslver) != SECSuccess)
+	{
+		ereport(isServerStart ? FATAL : LOG,
+				(errmsg("unable to get default protocol support from NSS")));
+		return -1;
+	}
+
+	/*
+	 * Set the fallback versions for the TLS protocol version range to a
+	 * combination of our minimal requirement and the library maximum. Error
+	 * messages should be kept identical to those in be-secure-openssl.c to
+	 * make translations easier.
+	 */
+	desired_sslver.min = SSL_LIBRARY_VERSION_TLS_1_0;
+	desired_sslver.max = supported_sslver.max;
+
+	if (ssl_min_protocol_version)
+	{
+		int			ver = ssl_protocol_version_to_nss(ssl_min_protocol_version,
+													  "ssl_min_protocol_version");
+
+		if (ver == -1)
+		{
+			ereport(isServerStart ? FATAL : LOG,
+					(errmsg("\"%s\" setting \"%s\" not supported by this build",
+							"ssl_min_protocol_version",
+							GetConfigOption("ssl_min_protocol_version",
+											false, false))));
+			return -1;
+		}
+
+		if (ver > 0)
+			desired_sslver.min = ver;
+	}
+
+	if (ssl_max_protocol_version)
+	{
+		int			ver = ssl_protocol_version_to_nss(ssl_max_protocol_version,
+													  "ssl_max_protocol_version");
+
+		if (ver == -1)
+		{
+			ereport(isServerStart ? FATAL : LOG,
+					(errmsg("\"%s\" setting \"%s\" not supported by this build",
+							"ssl_max_protocol_version",
+							GetConfigOption("ssl_max_protocol_version",
+											false, false))));
+			return -1;
+		}
+		if (ver > 0)
+			desired_sslver.max = ver;
+
+		if (ver < desired_sslver.min)
+		{
+			ereport(isServerStart ? FATAL : LOG,
+					(errmsg("could not set SSL protocol version range"),
+					 errdetail("\"%s\" cannot be higher than \"%s\"",
+							   "ssl_min_protocol_version",
+							   "ssl_max_protocol_version")));
+			return -1;
+		}
+	}
+
+	/*
+	 * Set the passphrase callback which will be used both to obtain the
+	 * passphrase from the user, as well as by NSS to obtain the phrase
+	 * repeatedly.
+	 */
+	ssl_is_server_start = isServerStart;
+	(*nss_tls_init_hook) (isServerStart);
+
+	return 0;
+}
+
+int
+be_tls_open_server(Port *port)
+{
+	SECStatus	status;
+	PRFileDesc *model;
+	PRFileDesc *pr_fd;
+	PRFileDesc *layer;
+	CERTCertificate *server_cert;
+	SECKEYPrivateKey *private_key;
+	CERTSignedCrl *crl;
+	SECItem		crlname;
+	char	   *cert_database;
+	NSSInitParameters params;
+
+	/*
+	 * The NSPR documentation states that runtime initialization via PR_Init
+	 * is no longer required, as the first caller into NSPR will perform the
+	 * initialization implicitly. The documentation doesn't however clarify
+	 * from which version this is holds true, so let's perform the potentially
+	 * superfluous initialization anyways to avoid crashing on older versions
+	 * of NSPR, as there is no difference in overhead.  The NSS documentation
+	 * still states that PR_Init must be called in some way (implicitly or
+	 * explicitly).
+	 *
+	 * The below parameters are what the implicit initialization would've done
+	 * for us, and should work even for older versions where it might not be
+	 * done automatically. The last parameter, maxPTDs, is set to various
+	 * values in other codebases, but has been unused since NSPR 2.1 which was
+	 * released sometime in 1998. In current versions of NSPR all parameters
+	 * are ignored.
+	 */
+	PR_Init(PR_USER_THREAD, PR_PRIORITY_NORMAL, 0 /* maxPTDs */ );
+
+	/*
+	 * The certificate path (configdir) must contain a valid NSS database. If
+	 * the certificate path isn't a valid directory, NSS will fall back on the
+	 * system certificate database. If the certificate path is a directory but
+	 * is empty then the initialization will fail. On the client side this can
+	 * be allowed for any sslmode but the verify-xxx ones.
+	 * https://bugzilla.redhat.com/show_bug.cgi?id=728562 For the server side
+	 * we won't allow this to fail however, as we require the certificate and
+	 * key to exist.
+	 *
+	 * The original design of NSS was for a single application to use a single
+	 * copy of it, initialized with NSS_Initialize() which isn't returning any
+	 * handle with which to refer to NSS. NSS initialization and shutdown are
+	 * global for the application, so a shutdown in another NSS enabled
+	 * library would cause NSS to be stopped for libpq as well.  The fix has
+	 * been to introduce NSS_InitContext which returns a context handle to
+	 * pass to NSS_ShutdownContext.  NSS_InitContext was introduced in NSS
+	 * 3.12, but the use of it is not very well documented.
+	 * https://bugzilla.redhat.com/show_bug.cgi?id=738456
+	 *
+	 * The InitParameters struct passed can be used to override internal
+	 * values in NSS, but the usage is not documented at all. When using
+	 * NSS_Init initializations, the values are instead set via PK11_Configure
+	 * calls so the PK11_Configure documentation can be used to glean some
+	 * details on these.
+	 *
+	 * https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS/PKCS11/Module_Specs
+	 */
+	memset(&params, '\0', sizeof(params));
+	params.length = sizeof(params);
+
+	if (!ssl_database || strlen(ssl_database) == 0)
+		ereport(FATAL,
+				(errmsg("no certificate database specified")));
+
+	cert_database = psprintf("sql:%s", ssl_database);
+	nss_context = NSS_InitContext(cert_database, "", "", "",
+								  &params,
+								  NSS_INIT_READONLY | NSS_INIT_PK11RELOAD);
+	pfree(cert_database);
+
+	if (!nss_context)
+		ereport(FATAL,
+				(errmsg("unable to read certificate database \"%s\": %s",
+						ssl_database, pg_SSLerrmessage(PR_GetError()))));
+
+	/*
+	 * Import the already opened socket as we don't want to use NSPR functions
+	 * for opening the network socket due to how the PostgreSQL protocol works
+	 * with TLS connections. This function is not part of the NSPR public API,
+	 * see the comment at the top of the file for the rationale of still using
+	 * it.
+	 */
+	pr_fd = PR_ImportTCPSocket(port->sock);
+	if (!pr_fd)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to connect to socket")));
+		return -1;
+	}
+
+	/*
+	 * Most of the documentation available, and implementations of, NSS/NSPR
+	 * use the PR_NewTCPSocket() function here, which has the drawback that it
+	 * can only create IPv4 sockets. Instead use PR_OpenTCPSocket() which
+	 * copes with IPv6 as well.
+	 *
+	 * We use a model filedescriptor here which is a construct in NSPR/NSS in
+	 * order to create a configuration template for sockets which can then be
+	 * applied to new sockets created. This makes more sense in a server which
+	 * accepts multiple connections and want to perform the boilerplate just
+	 * once, but it does provide a nice abstraction here as well in that we
+	 * can error out early without having performed any operation on the real
+	 * socket.
+	 */
+	model = PR_OpenTCPSocket(port->laddr.addr.ss_family);
+	if (!model)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to open socket")));
+		return -1;
+	}
+
+	/*
+	 * Convert the NSPR socket to an SSL socket. Ensuring the success of this
+	 * operation is critical as NSS SSL_* functions may return SECSuccess on
+	 * the socket even though SSL hasn't been enabled, which introduce a risk
+	 * of silent downgrades.
+	 */
+	model = SSL_ImportFD(NULL, model);
+	if (!model)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to enable TLS on socket")));
+		return -1;
+	}
+
+	/*
+	 * Configure basic settings for the connection over the SSL socket in
+	 * order to set it up as a server.
+	 */
+	if (SSL_OptionSet(model, SSL_SECURITY, PR_TRUE) != SECSuccess)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to configure TLS connection")));
+		return -1;
+	}
+
+	if (SSL_OptionSet(model, SSL_HANDSHAKE_AS_SERVER, PR_TRUE) != SECSuccess ||
+		SSL_OptionSet(model, SSL_HANDSHAKE_AS_CLIENT, PR_FALSE) != SECSuccess)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to configure TLS connection as server")));
+		return -1;
+	}
+
+	/*
+	 * SSLv2 is disabled by default, and SSLv3 will be excluded from the range
+	 * of allowed protocols further down. Since we really don't want these to
+	 * ever be enabled, let's use belts and suspenders and explicitly turn
+	 * them off as well.
+	 */
+	SSL_OptionSet(model, SSL_ENABLE_SSL2, PR_FALSE);
+	SSL_OptionSet(model, SSL_ENABLE_SSL3, PR_FALSE);
+
+#ifdef SSL_CBC_RANDOM_IV
+
+	/*
+	 * Enable protection against the BEAST attack in case the NSS server has
+	 * support for that. While SSLv3 is disabled, we may still allow TLSv1
+	 * which is affected. The option isn't documented as an SSL option, but as
+	 * an NSS environment variable.
+	 */
+	SSL_OptionSet(model, SSL_CBC_RANDOM_IV, PR_TRUE);
+#endif
+
+	/*
+	 * Configure the allowed ciphers. If there are no user preferred suites,
+	 * set the domestic policy.
+	 *
+	 * Historically there were different cipher policies based on export (and
+	 * import) restrictions: Domestic, Export and France. These are since long
+	 * removed with all ciphers being enabled by default. Due to backwards
+	 * compatibility, the old API is still used even though all three policies
+	 * now do the same thing.
+	 *
+	 * If SSLCipherSuites define a policy of the user, we set that rather than
+	 * enabling all ciphers via NSS_SetDomesticPolicy.
+	 *
+	 * TODO: while this code works, the set of ciphers which can be set and
+	 * still end up with a working socket is woefully underdocumented for
+	 * anything more recent than SSLv3 (the code for TLS actually calls ssl3
+	 * functions under the hood for SSL_CipherPrefSet), so it's unclear if
+	 * this is helpful or not. Using the policies works, but may be too
+	 * coarsely grained.
+	 *
+	 * Another TODO: The SSL_ImplementedCiphers table returned with calling
+	 * SSL_GetImplementedCiphers is sorted in server preference order. Sorting
+	 * SSLCipherSuites according to the order of the ciphers therein could be
+	 * a way to implement ssl_prefer_server_ciphers - if we at all want to use
+	 * cipher selection for NSS like how we do it for OpenSSL that is.
+	 */
+
+	/*
+	 * If no ciphers are specified, enable them all.
+	 */
+	if (!SSLCipherSuites || strlen(SSLCipherSuites) == 0)
+	{
+		status = NSS_SetDomesticPolicy();
+		if (status != SECSuccess)
+		{
+			ereport(COMMERROR,
+					(errmsg("unable to set cipher policy: %s",
+							pg_SSLerrmessage(PR_GetError()))));
+			return -1;
+		}
+	}
+	else
+	{
+		char	   *ciphers,
+				   *c;
+
+		char	   *sep = ":;, ";
+		PRUint16	ciphercode;
+		const		PRUint16 *nss_ciphers;
+
+		/*
+		 * If the user has specified a set of preferred cipher suites we start
+		 * by turning off all the existing suites to avoid the risk of down-
+		 * grades to a weaker cipher than expected.
+		 */
+		nss_ciphers = SSL_GetImplementedCiphers();
+		for (int i = 0; i < SSL_GetNumImplementedCiphers(); i++)
+			SSL_CipherPrefSet(model, nss_ciphers[i], PR_FALSE);
+
+		ciphers = pstrdup(SSLCipherSuites);
+
+		for (c = strtok(ciphers, sep); c; c = strtok(NULL, sep))
+		{
+			ciphercode = pg_find_cipher(c);
+			if (ciphercode != INVALID_CIPHER)
+			{
+				status = SSL_CipherPrefSet(model, ciphercode, PR_TRUE);
+				if (status != SECSuccess)
+				{
+					ereport(COMMERROR,
+							(errmsg("invalid cipher-suite specified: %s", c)));
+					return -1;
+				}
+			}
+		}
+
+		pfree(ciphers);
+	}
+
+	if (SSL_VersionRangeSet(model, &desired_sslver) != SECSuccess)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to set requested SSL protocol version range")));
+		return -1;
+	}
+
+	/*
+	 * Set up the custom IO layer.
+	 */
+	layer = init_iolayer(port);
+	if (!layer)
+		return -1;
+
+	if (PR_PushIOLayer(pr_fd, PR_TOP_IO_LAYER, layer) != PR_SUCCESS)
+	{
+		PR_Close(layer);
+		ereport(COMMERROR,
+				(errmsg("unable to push IO layer")));
+		return -1;
+	}
+
+	server_cert = PK11_FindCertFromNickname(ssl_cert_file, (void *) port);
+	if (!server_cert)
+	{
+		if (dummy_ssl_passwd_cb_called)
+		{
+			ereport(COMMERROR,
+					(errmsg("unable to load certificate for \"%s\": %s",
+							ssl_cert_file, pg_SSLerrmessage(PR_GetError())),
+					 errhint("The certificate requires a password.")));
+			return -1;
+		}
+		else
+		{
+			ereport(COMMERROR,
+					(errmsg("unable to find certificate for \"%s\": %s",
+							ssl_cert_file, pg_SSLerrmessage(PR_GetError()))));
+			return -1;
+		}
+	}
+
+	private_key = PK11_FindKeyByAnyCert(server_cert, (void *) port);
+	if (!private_key)
+	{
+		if (dummy_ssl_passwd_cb_called)
+		{
+			ereport(COMMERROR,
+					(errmsg("unable to load private key for \"%s\": %s",
+							ssl_cert_file, pg_SSLerrmessage(PR_GetError())),
+					 errhint("The private key requires a password.")));
+			return -1;
+		}
+		else
+		{
+			ereport(COMMERROR,
+					(errmsg("unable to find private key for \"%s\": %s",
+							ssl_cert_file, pg_SSLerrmessage(PR_GetError()))));
+			return -1;
+		}
+	}
+
+	/*
+	 * NSS doesn't use CRL files on disk, so we use the ssl_crl_file guc to
+	 * contain the CRL nickname for the current server certificate in the NSS
+	 * certificate database. The main difference from the OpenSSL backend is
+	 * that NSS will use the CRL regardless, but being able to make sure the
+	 * CRL is loaded seems like a good feature.
+	 */
+	if (ssl_crl_file[0])
+	{
+		SECITEM_CopyItem(NULL, &crlname, &server_cert->derSubject);
+		crl = SEC_FindCrlByName(CERT_GetDefaultCertDB(), &crlname, SEC_CRL_TYPE);
+		if (!crl)
+		{
+			ereport(COMMERROR,
+					(errmsg("specified CRL not found in database")));
+			return -1;
+		}
+		SEC_DestroyCrl(crl);
+	}
+
+	/*
+	 * Finally we must configure the socket for being a server by setting the
+	 * certificate and key. The NULL parameter is an SSLExtraServerCertData
+	 * pointer with the final parameter being the size of the extra server
+	 * cert data structure pointed to. This is typically only used for
+	 * credential delegation.
+	 */
+	status = SSL_ConfigServerCert(model, server_cert, private_key, NULL, 0);
+	if (status != SECSuccess)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to configure server for TLS server connections: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+		return -1;
+	}
+
+	ssl_loaded_verify_locations = true;
+
+	/*
+	 * At this point, we no longer have use for the certificate and private
+	 * key as they have been copied into the context by NSS. Destroy our
+	 * copies explicitly to clean out the memory as best we can.
+	 */
+	CERT_DestroyCertificate(server_cert);
+	SECKEY_DestroyPrivateKey(private_key);
+
+	/* Set up certificate authentication callback */
+	status = SSL_AuthCertificateHook(model, pg_cert_auth_handler, (void *) port);
+	if (status != SECSuccess)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to install authcert hook: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+		return -1;
+	}
+	SSL_BadCertHook(model, pg_bad_cert_handler, (void *) port);
+	SSL_OptionSet(model, SSL_REQUEST_CERTIFICATE, PR_TRUE);
+	SSL_OptionSet(model, SSL_REQUIRE_CERTIFICATE, PR_FALSE);
+
+	port->pr_fd = SSL_ImportFD(model, pr_fd);
+	if (!port->pr_fd)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to initialize")));
+		return -1;
+	}
+
+	PR_Close(model);
+
+	/*
+	 * Force a handshake on the next I/O request, the second parameter means
+	 * that we are a server, PR_FALSE would indicate being a client. NSPR
+	 * requires us to call SSL_ResetHandshake since we imported an already
+	 * established socket.
+	 */
+	status = SSL_ResetHandshake(port->pr_fd, PR_TRUE);
+	if (status != SECSuccess)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to initiate handshake: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+		return -1;
+	}
+	status = SSL_ForceHandshake(port->pr_fd);
+	if (status != SECSuccess)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to handshake: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+		return -1;
+	}
+
+	port->ssl_in_use = true;
+
+	/* Register out shutdown callback */
+	NSS_RegisterShutdown(pg_SSLShutdownFunc, port);
+
+	return 0;
+}
+
+ssize_t
+be_tls_read(Port *port, void *ptr, size_t len, int *waitfor)
+{
+	ssize_t		n_read;
+	PRErrorCode err;
+
+	n_read = PR_Read(port->pr_fd, ptr, len);
+
+	if (n_read < 0)
+	{
+		err = PR_GetError();
+
+		if (err == PR_WOULD_BLOCK_ERROR)
+		{
+			*waitfor = WL_SOCKET_READABLE;
+			errno = EWOULDBLOCK;
+		}
+		else
+			errno = ECONNRESET;
+	}
+
+	return n_read;
+}
+
+ssize_t
+be_tls_write(Port *port, void *ptr, size_t len, int *waitfor)
+{
+	ssize_t		n_write;
+	PRErrorCode err;
+	PRIntn		flags = 0;
+
+	/*
+	 * The flags parameter to PR_Send is no longer used and is, according to
+	 * the documentation, required to be zero.
+	 */
+	n_write = PR_Send(port->pr_fd, ptr, len, flags, PR_INTERVAL_NO_WAIT);
+
+	if (n_write < 0)
+	{
+		err = PR_GetError();
+
+		if (err == PR_WOULD_BLOCK_ERROR)
+		{
+			*waitfor = WL_SOCKET_WRITEABLE;
+			errno = EWOULDBLOCK;
+		}
+		else
+			errno = ECONNRESET;
+	}
+
+	return n_write;
+}
+
+void
+be_tls_close(Port *port)
+{
+	if (!port)
+		return;
+
+	if (port->peer_cn)
+	{
+		SSL_InvalidateSession(port->pr_fd);
+		pfree(port->peer_cn);
+		port->peer_cn = NULL;
+	}
+
+	PR_Close(port->pr_fd);
+	port->pr_fd = NULL;
+	port->ssl_in_use = false;
+
+	if (nss_context)
+	{
+		NSS_ShutdownContext(nss_context);
+		nss_context = NULL;
+	}
+}
+
+void
+be_tls_destroy(void)
+{
+	/*
+	 * It reads a bit odd to clear a session cache when we are destroying the
+	 * context altogether, but if the session cache isn't cleared before
+	 * shutting down the context it will fail with SEC_ERROR_BUSY.
+	 */
+	SSL_ClearSessionCache();
+}
+
+int
+be_tls_get_cipher_bits(Port *port)
+{
+	SECStatus	status;
+	SSLChannelInfo channel;
+	SSLCipherSuiteInfo suite;
+
+	status = SSL_GetChannelInfo(port->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+		goto error;
+
+	status = SSL_GetCipherSuiteInfo(channel.cipherSuite, &suite, sizeof(suite));
+	if (status != SECSuccess)
+		goto error;
+
+	return suite.effectiveKeyBits;
+
+error:
+	ereport(WARNING,
+			(errmsg("unable to extract TLS session information: %s",
+					pg_SSLerrmessage(PR_GetError()))));
+	return 0;
+}
+
+/*
+ * be_tls_get_compression
+ *
+ * NSS disabled support for TLS compression in version 3.33 and removed the
+ * code in a subsequent release. The API for retrieving information about
+ * compression as well as enabling it is kept for backwards compatibility, but
+ * we don't need to consult it since it was only available for SSLv3 which we
+ * don't support.
+ *
+ * https://bugzilla.mozilla.org/show_bug.cgi?id=1409587
+ */
+bool
+be_tls_get_compression(Port *port)
+{
+	return false;
+}
+
+/*
+ * be_tls_get_version
+ *
+ * Returns the protocol version used for the current connection, or NULL in
+ * case of errors.
+ */
+const char *
+be_tls_get_version(Port *port)
+{
+	SECStatus	status;
+	SSLChannelInfo channel;
+
+	status = SSL_GetChannelInfo(port->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+	{
+		ereport(WARNING,
+				(errmsg("unable to extract TLS session information: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+		return NULL;
+	}
+
+	return ssl_protocol_version_to_string(channel.protocolVersion);
+}
+
+const char *
+be_tls_get_cipher(Port *port)
+{
+	SECStatus	status;
+	SSLChannelInfo channel;
+	SSLCipherSuiteInfo suite;
+
+	status = SSL_GetChannelInfo(port->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+		goto error;
+
+	status = SSL_GetCipherSuiteInfo(channel.cipherSuite, &suite, sizeof(suite));
+	if (status != SECSuccess)
+		goto error;
+
+	return suite.cipherSuiteName;
+
+error:
+	ereport(WARNING,
+			(errmsg("unable to extract TLS session information: %s",
+					pg_SSLerrmessage(PR_GetError()))));
+	return NULL;
+}
+
+void
+be_tls_get_peer_subject_name(Port *port, char *ptr, size_t len)
+{
+	CERTCertificate *certificate;
+
+	certificate = SSL_PeerCertificate(port->pr_fd);
+	if (certificate)
+		strlcpy(ptr, CERT_NameToAscii(&certificate->subject), len);
+	else
+		ptr[0] = '\0';
+}
+
+void
+be_tls_get_peer_issuer_name(Port *port, char *ptr, size_t len)
+{
+	CERTCertificate *certificate;
+
+	certificate = SSL_PeerCertificate(port->pr_fd);
+	if (certificate)
+		strlcpy(ptr, CERT_NameToAscii(&certificate->issuer), len);
+	else
+		ptr[0] = '\0';
+}
+
+void
+be_tls_get_peer_serial(Port *port, char *ptr, size_t len)
+{
+	CERTCertificate *certificate;
+
+	certificate = SSL_PeerCertificate(port->pr_fd);
+	if (certificate)
+		snprintf(ptr, len, "%li", DER_GetInteger(&(certificate->serialNumber)));
+	else
+		ptr[0] = '\0';
+}
+
+char *
+be_tls_get_certificate_hash(Port *port, size_t *len)
+{
+	CERTCertificate *certificate;
+	SECOidTag	signature_alg;
+	SECOidTag	digest_alg;
+	int			digest_len;
+	const NSSSignatureAlgorithms *candidate;
+	SECStatus	status;
+	PLArenaPool *arena = NULL;
+	SECItem		digest;
+	char	   *ret;
+
+	*len = 0;
+	certificate = SSL_LocalCertificate(port->pr_fd);
+	if (!certificate)
+		return NULL;
+
+	signature_alg = SECOID_GetAlgorithmTag(&certificate->signature);
+
+	candidate = NSS_SCRAMDigestAlgorithm;
+	while (candidate->signature)
+	{
+		if (signature_alg == candidate->signature)
+		{
+			digest_alg = candidate->hash;
+			digest_len = candidate->len;
+			break;
+		}
+
+		candidate++;
+	}
+
+	if (!candidate->signature)
+		elog(ERROR, "could not find digest for OID '%s'",
+			 SECOID_FindOIDTagDescription(signature_alg));
+
+	arena = PORT_NewArena(SEC_ASN1_DEFAULT_ARENA_SIZE);
+	digest.data = PORT_ArenaZAlloc(arena, sizeof(unsigned char) * digest_len);
+	digest.len = digest_len;
+
+	status = PK11_HashBuf(digest_alg, digest.data,
+						  certificate->derCert.data,
+						  certificate->derCert.len);
+
+	if (status != SECSuccess)
+	{
+		PORT_FreeArena(arena, PR_TRUE);
+		return NULL;
+	}
+
+	ret = palloc(digest.len);
+	memcpy(ret, digest.data, digest.len);
+	*len = digest_len;
+	PORT_FreeArena(arena, PR_TRUE);
+
+	return ret;
+}
+
+/* ------------------------------------------------------------ */
+/*						Internal functions						*/
+/* ------------------------------------------------------------ */
+
+/*
+ * default_nss_tls_init
+ *
+ * The default TLS init hook function which users can override for installing
+ * their own passphrase callbacks and similar actions. In case no callback has
+ * been configured, or the callback isn't reload capable during a server
+ * reload, the dummy callback will be installed.
+ *
+ * The private data for the callback is set differently depending on how it's
+ * invoked. For calls which may invoke the callback deeper in the callstack
+ * the private data is set with SSL_SetPKCS11PinArg. When the call is directly
+ * invoking the callback, like PK11_FindCertFromNickname, then the private
+ * data is passed as a parameter. Setting the data with SSL_SetPKCS11PinArg is
+ * thus not required but good practice.
+ *
+ * NSS doesn't provide a default callback like OpenSSL does, but a callback is
+ * required to be set.  The password callback can be installed at any time, but
+ * setting the private data with SSL_SetPKCS11PinArg requires a PR Filedesc.
+ */
+static void
+default_nss_tls_init(bool isServerStart)
+{
+	/*
+	 * No user-defined callback has been configured, install the dummy call-
+	 * back since we must set something.
+	 */
+	if (!ssl_passphrase_command[0])
+		PK11_SetPasswordFunc(dummy_ssl_passphrase_cb);
+	else
+	{
+		/*
+		 * There is a user-defined callback, set it unless we are in a restart
+		 * and cannot handle restarts due to an interactive callback.
+		 */
+		if (isServerStart)
+			PK11_SetPasswordFunc(external_ssl_passphrase_cb);
+		else
+		{
+			if (ssl_passphrase_command_supports_reload)
+				PK11_SetPasswordFunc(external_ssl_passphrase_cb);
+			else
+				PK11_SetPasswordFunc(dummy_ssl_passphrase_cb);
+		}
+	}
+}
+
+/*
+ * external_ssl_passphrase_cb
+ *
+ * Runs the callback configured by ssl_passphrase_command and returns the
+ * captured password back to NSS.
+ */
+static char *
+external_ssl_passphrase_cb(PK11SlotInfo *slot, PRBool retry, void *arg)
+{
+	/*
+	 * NSS use a hardcoded 256 byte buffer for reading the password so set the
+	 * same limit for our callback buffer.
+	 */
+	char		buf[256];
+	int			len;
+	char	   *password = NULL;
+	char	   *prompt;
+
+	/*
+	 * Since there is no password callback in NSS when the server starts up,
+	 * it makes little sense to create an interactive callback. Thus, if this
+	 * is a retry attempt then give up immediately.
+	 */
+	if (retry)
+		return NULL;
+
+	/*
+	 * Construct the same prompt that NSS uses internally even though it is
+	 * unlikely to serve much purpose, but we must set a prompt so we might as
+	 * well do it right.
+	 */
+	prompt = psprintf("Enter Password or Pin for \"%s\":",
+					  PK11_GetTokenName(slot));
+
+	len = run_ssl_passphrase_command(prompt, ssl_is_server_start, buf, sizeof(buf));
+	pfree(prompt);
+
+	if (!len)
+		return NULL;
+
+	/*
+	 * At least one byte with password content was returned, and NSS requires
+	 * that we return it allocated in NSS controlled memory. If we fail to
+	 * allocate then abort without passing back NULL and bubble up the error
+	 * on the PG side.
+	 */
+	password = (char *) PR_Malloc(len + 1);
+	if (!password)
+	{
+		explicit_bzero(buf, sizeof(buf));
+		ereport(ERROR,
+				(errcode(ERRCODE_OUT_OF_MEMORY),
+				 errmsg("out of memory")));
+	}
+	strlcpy(password, buf, sizeof(password));
+	explicit_bzero(buf, sizeof(buf));
+
+	return password;
+}
+
+/*
+ * dummy_ssl_passphrase_cb
+ *
+ * Return unsuccessful if we are asked to provide the passphrase for a cert or
+ * key, without having a passphrase callback installed.
+ */
+static char *
+dummy_ssl_passphrase_cb(PK11SlotInfo *slot, PRBool retry, void *arg)
+{
+	dummy_ssl_passwd_cb_called = true;
+	return NULL;
+}
+
+static SECStatus
+pg_bad_cert_handler(void *arg, PRFileDesc *fd)
+{
+	Port	   *port = (Port *) arg;
+
+	port->peer_cert_valid = false;
+	return SECFailure;
+}
+
+/*
+ * raw_subject_common_name
+ *
+ * Returns the Subject Common Name for the given certificate as a raw char
+ * buffer (that is, without any form of escaping for unprintable characters or
+ * embedded nulls), with the length of the buffer returned in the len param.
+ * The buffer is allocated in the TopMemoryContext and is given a NULL
+ * terminator so that callers are safe to call strlen() on it.
+ *
+ * This is used instead of CERT_GetCommonName(), which always performs quoting
+ * and/or escaping. NSS doesn't appear to give us a way to easily unescape the
+ * result, and we need to store the raw CN into port->peer_cn for compatibility
+ * with the OpenSSL implementation.
+ */
+static char *
+raw_subject_common_name(CERTCertificate *cert, unsigned int *len)
+{
+	CERTName	subject = cert->subject;
+	CERTRDN	  **rdn;
+
+	for (rdn = subject.rdns; *rdn; rdn++)
+	{
+		CERTAVA	  **ava;
+
+		for (ava = (*rdn)->avas; *ava; ava++)
+		{
+			SECItem	   *buf;
+			char	   *cn;
+
+			if (CERT_GetAVATag(*ava) != SEC_OID_AVA_COMMON_NAME)
+				continue;
+
+			/* Found a CN, ecode and copy it into a newly allocated buffer */
+			buf = CERT_DecodeAVAValue(&(*ava)->value);
+			if (!buf)
+			{
+				/*
+				 * This failure case is difficult to test. (Since this code
+				 * runs after certificate authentication has otherwise
+				 * succeeded, you'd need to convince a CA implementation to
+				 * sign a corrupted certificate in order to get here.)
+				 *
+				 * Follow the behavior of CERT_GetCommonName() in this case and
+				 * simply return NULL, as if a Common Name had not been found.
+				 */
+				goto fail;
+			}
+
+			cn = MemoryContextAlloc(TopMemoryContext, buf->len + 1);
+			memcpy(cn, buf->data, buf->len);
+			cn[buf->len] = '\0';
+
+			*len = buf->len;
+
+			SECITEM_FreeItem(buf, PR_TRUE);
+			return cn;
+		}
+	}
+
+fail:
+	/* Not found. */
+	*len = 0;
+	return NULL;
+}
+
+/*
+ * pg_cert_auth_handler
+ *
+ * Callback for validation of incoming certificates. Returning SECFailure will
+ * cause NSS to terminate the connection immediately.
+ */
+static SECStatus
+pg_cert_auth_handler(void *arg, PRFileDesc *fd, PRBool checksig, PRBool isServer)
+{
+	SECStatus	status;
+	Port	   *port = (Port *) arg;
+	CERTCertificate *cert;
+	char	   *peer_cn;
+	unsigned int len;
+
+	status = SSL_AuthCertificate(CERT_GetDefaultCertDB(), port->pr_fd, checksig, PR_TRUE);
+	if (status != SECSuccess)
+		return status;
+
+	port->peer_cn = NULL;
+	port->peer_cert_valid = false;
+
+	cert = SSL_PeerCertificate(port->pr_fd);
+	if (!cert)
+	{
+		/* Shouldn't be possible; why did we get a client cert callback? */
+		Assert(cert != NULL);
+
+		PR_SetError(SEC_ERROR_LIBRARY_FAILURE, 0);
+		return SECFailure;
+	}
+
+	peer_cn = raw_subject_common_name(cert, &len);
+	if (!peer_cn)
+	{
+		/* No Common Name, but the certificate otherwise checks out. */
+		port->peer_cert_valid = true;
+
+		status = SECSuccess;
+		goto cleanup;
+	}
+
+	/*
+	 * Reject embedded NULLs in certificate common name to prevent attacks like
+	 * CVE-2009-4034.
+	 */
+	if (len != strlen(peer_cn))
+	{
+		ereport(COMMERROR,
+				(errcode(ERRCODE_PROTOCOL_VIOLATION),
+				 errmsg("SSL certificate's common name contains embedded null")));
+
+		pfree(peer_cn);
+		PR_SetError(SEC_ERROR_CERT_NOT_VALID, 0);
+
+		status = SECFailure;
+		goto cleanup;
+	}
+
+	port->peer_cn = peer_cn;
+	port->peer_cert_valid = true;
+
+	status = SECSuccess;
+
+cleanup:
+	CERT_DestroyCertificate(cert);
+	return status;
+}
+
+static PRInt32
+pg_ssl_read(PRFileDesc *fd, void *buf, PRInt32 amount, PRIntn flags,
+			PRIntervalTime timeout)
+{
+	PRRecvFN	read_fn;
+	PRInt32		n_read;
+
+	read_fn = fd->lower->methods->recv;
+	n_read = read_fn(fd->lower, buf, amount, flags, timeout);
+
+	return n_read;
+}
+
+static PRInt32
+pg_ssl_write(PRFileDesc *fd, const void *buf, PRInt32 amount, PRIntn flags,
+			 PRIntervalTime timeout)
+{
+	PRSendFN	send_fn;
+	PRInt32		n_write;
+
+	send_fn = fd->lower->methods->send;
+	n_write = send_fn(fd->lower, buf, amount, flags, timeout);
+
+	return n_write;
+}
+
+static PRStatus
+pg_ssl_close(PRFileDesc *fd)
+{
+	/*
+	 * Disconnect our private Port from the fd before closing out the stack.
+	 * (Debug builds of NSPR will assert if we do not.)
+	 */
+	fd->secret = NULL;
+	return PR_GetDefaultIOMethods()->close(fd);
+}
+
+static PRFileDesc *
+init_iolayer(Port *port)
+{
+	const		PRIOMethods *default_methods;
+	PRFileDesc *layer;
+
+	/*
+	 * Start by initializing our layer with all the default methods so that we
+	 * can selectively override the ones we want while still ensuring that we
+	 * have a complete layer specification.
+	 */
+	default_methods = PR_GetDefaultIOMethods();
+	memcpy(&pr_iomethods, default_methods, sizeof(PRIOMethods));
+
+	pr_iomethods.recv = pg_ssl_read;
+	pr_iomethods.send = pg_ssl_write;
+	pr_iomethods.close = pg_ssl_close;
+
+	/*
+	 * Each IO layer must be identified by a unique name, where uniqueness is
+	 * per connection. Each connection in a postgres cluster can generate the
+	 * identity from the same string as they will create their IO layers on
+	 * different sockets. Only one layer per socket can have the same name.
+	 */
+	pr_id = PR_GetUniqueIdentity("PostgreSQL Server");
+	if (pr_id == PR_INVALID_IO_LAYER)
+	{
+		ereport(ERROR,
+				(errmsg("out of memory when setting up TLS connection")));
+		return NULL;
+	}
+
+	/*
+	 * Create the actual IO layer as a stub such that it can be pushed onto
+	 * the layer stack. The step via a stub is required as we define custom
+	 * callbacks.
+	 */
+	layer = PR_CreateIOLayerStub(pr_id, &pr_iomethods);
+	if (!layer)
+	{
+		ereport(ERROR,
+				(errmsg("unable to create NSS I/O layer")));
+		return NULL;
+	}
+
+	/* Store the Port as private data available in callbacks */
+	layer->secret = (void *) port;
+
+	return layer;
+}
+
+static char *
+ssl_protocol_version_to_string(int v)
+{
+	switch (v)
+	{
+			/* SSL v2 and v3 are not supported */
+		case SSL_LIBRARY_VERSION_2:
+		case SSL_LIBRARY_VERSION_3_0:
+			Assert(false);
+			break;
+
+		case SSL_LIBRARY_VERSION_TLS_1_0:
+			return pstrdup("TLSv1.0");
+		case SSL_LIBRARY_VERSION_TLS_1_1:
+			return pstrdup("TLSv1.1");
+		case SSL_LIBRARY_VERSION_TLS_1_2:
+			return pstrdup("TLSv1.2");
+		case SSL_LIBRARY_VERSION_TLS_1_3:
+			return pstrdup("TLSv1.3");
+	}
+
+	return pstrdup("unknown");
+}
+
+
+/*
+ * ssl_protocol_version_to_nss
+ *			Translate PostgreSQL TLS version to NSS version
+ *
+ * Returns zero in case the requested TLS version is undefined (PG_ANY) and
+ * should be set by the caller, or -1 on failure.
+ */
+static uint16
+ssl_protocol_version_to_nss(int v, const char *guc_name)
+{
+	switch (v)
+	{
+			/*
+			 * There is no SSL_LIBRARY_ macro defined in NSS with the value
+			 * zero, so we use this to signal the caller that the highest
+			 * useful version should be set on the connection.
+			 */
+		case PG_TLS_ANY:
+			return 0;
+
+			/*
+			 * No guard is required here as there are no versions of NSS
+			 * without support for TLS1.
+			 */
+		case PG_TLS1_VERSION:
+			return SSL_LIBRARY_VERSION_TLS_1_0;
+		case PG_TLS1_1_VERSION:
+#ifdef SSL_LIBRARY_VERSION_TLS_1_1
+			return SSL_LIBRARY_VERSION_TLS_1_1;
+#else
+			break;
+#endif
+		case PG_TLS1_2_VERSION:
+#ifdef SSL_LIBRARY_VERSION_TLS_1_2
+			return SSL_LIBRARY_VERSION_TLS_1_2;
+#else
+			break;
+#endif
+		case PG_TLS1_3_VERSION:
+#ifdef SSL_LIBRARY_VERSION_TLS_1_3
+			return SSL_LIBRARY_VERSION_TLS_1_3;
+#else
+			break;
+#endif
+		default:
+			break;
+	}
+
+	return -1;
+}
+
+/*
+ * pg_SSLerrmessage
+ *		Create and return a human readable error message given
+ *		the specified error code
+ *
+ * PR_ErrorToName only converts the enum identifier of the error to string,
+ * but that can be quite useful for debugging (and in case PR_ErrorToString is
+ * unable to render a message then we at least have something).
+ */
+static char *
+pg_SSLerrmessage(PRErrorCode errcode)
+{
+	return psprintf("%s (%s)",
+					PR_ErrorToString(errcode, PR_LANGUAGE_I_DEFAULT),
+					PR_ErrorToName(errcode));
+}
+
+/*
+ * pg_SSLShutdownFunc
+ *		Callback for NSS shutdown
+ *
+ * If NSS is terminated from the outside when the connection is still in use
+ * we must treat this as potentially hostile and immediately close to avoid
+ * leaking the connection in any way. Once this is called, NSS will shutdown
+ * regardless so we may as well clean up the best we can. Returning SECFailure
+ * will cause the NSS shutdown to return with an error, but it will shutdown
+ * nevertheless. nss_data is reserved for future use and is always NULL.
+ */
+static SECStatus
+pg_SSLShutdownFunc(void *private_data, void *nss_data)
+{
+	Port *port = (Port *) private_data;
+
+	if (!port || !port->ssl_in_use)
+		return SECSuccess;
+
+	/*
+	 * There is a connection still open, close it and signal to whatever that
+	 * called the shutdown that it was erroneous.
+	 */
+	be_tls_close(port);
+	be_tls_destroy();
+
+	return SECFailure;
+}
diff --git a/src/backend/libpq/be-secure.c b/src/backend/libpq/be-secure.c
index 4cf139a223..5e0c27c134 100644
--- a/src/backend/libpq/be-secure.c
+++ b/src/backend/libpq/be-secure.c
@@ -49,6 +49,9 @@ bool		ssl_passphrase_command_supports_reload;
 #ifdef USE_SSL
 bool		ssl_loaded_verify_locations = false;
 #endif
+#ifdef USE_NSS
+char	   *ssl_database;
+#endif
 
 /* GUC variable controlling SSL cipher list */
 char	   *SSLCipherSuites = NULL;
diff --git a/src/backend/libpq/hba.c b/src/backend/libpq/hba.c
index 20bf1461ce..9a04c093d5 100644
--- a/src/backend/libpq/hba.c
+++ b/src/backend/libpq/hba.c
@@ -1041,7 +1041,7 @@ parse_hba_line(TokenizedLine *tok_line, int elevel)
 			ereport(elevel,
 					(errcode(ERRCODE_CONFIG_FILE_ERROR),
 					 errmsg("hostssl record cannot match because SSL is not supported by this build"),
-					 errhint("Compile with --with-ssl=openssl to use SSL connections."),
+					 errhint("Compile with --with-ssl to use SSL connections."),
 					 errcontext("line %d of configuration file \"%s\"",
 								line_num, HbaFileName)));
 			*err_msg = "hostssl record cannot match because SSL is not supported by this build";
diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c
index eafdb1118e..b023b31c46 100644
--- a/src/backend/utils/misc/guc.c
+++ b/src/backend/utils/misc/guc.c
@@ -4308,7 +4308,11 @@ static struct config_string ConfigureNamesString[] =
 		},
 		&ssl_library,
 #ifdef USE_SSL
+#if defined(USE_OPENSSL)
 		"OpenSSL",
+#elif defined(USE_NSS)
+		"NSS",
+#endif
 #else
 		"",
 #endif
@@ -4366,6 +4370,18 @@ static struct config_string ConfigureNamesString[] =
 		check_canonical_path, assign_pgstat_temp_directory, NULL
 	},
 
+#ifdef USE_NSS
+	{
+		{"ssl_database", PGC_SIGHUP, CONN_AUTH_SSL,
+			gettext_noop("Location of the NSS certificate database."),
+			NULL
+		},
+		&ssl_database,
+		"",
+		NULL, NULL, NULL
+	},
+#endif
+
 	{
 		{"synchronous_standby_names", PGC_SIGHUP, REPLICATION_PRIMARY,
 			gettext_noop("Number of synchronous standbys and list of names of potential synchronous ones."),
@@ -4394,8 +4410,10 @@ static struct config_string ConfigureNamesString[] =
 			GUC_SUPERUSER_ONLY
 		},
 		&SSLCipherSuites,
-#ifdef USE_OPENSSL
+#if defined(USE_OPENSSL)
 		"HIGH:MEDIUM:+3DES:!aNULL",
+#elif defined (USE_NSS)
+		"",
 #else
 		"none",
 #endif
diff --git a/src/common/Makefile b/src/common/Makefile
index 5422579a6a..be8b2583b2 100644
--- a/src/common/Makefile
+++ b/src/common/Makefile
@@ -85,12 +85,17 @@ OBJS_COMMON += \
 	protocol_openssl.o \
 	cryptohash_openssl.o
 else
+ifeq ($(with_ssl),nss)
+OBJS_COMMON += \
+	cryptohash_nss.o
+else
 OBJS_COMMON += \
 	cryptohash.o \
 	md5.o \
 	sha1.o \
 	sha2.o
 endif
+endif
 
 # A few files are currently only built for frontend, not server
 # (Mkvcbuild.pm has a copy of this list, too).  logging.c is excluded
diff --git a/src/include/common/pg_nss.h b/src/include/common/pg_nss.h
new file mode 100644
index 0000000000..008fee85f1
--- /dev/null
+++ b/src/include/common/pg_nss.h
@@ -0,0 +1,175 @@
+/*-------------------------------------------------------------------------
+ *
+ * pg_nss.h
+ *	  Support for NSS as a TLS backend
+ *
+ * These definitions are used by both frontend and backend code.
+ *
+ * Copyright (c) 2020, PostgreSQL Global Development Group
+ *
+ * IDENTIFICATION
+ *        src/include/common/pg_nss.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef PG_NSS_H
+#define PG_NSS_H
+
+#ifdef USE_NSS
+#define NO_NSPR_10_SUPPORT
+#include <nss/hasht.h>
+#include <nss/secoidt.h>
+#include <nss/sslproto.h>
+
+PRUint16	pg_find_cipher(char *name);
+
+typedef struct
+{
+	SECOidTag	signature;
+	SECOidTag	hash;
+	int			len;
+}			NSSSignatureAlgorithms;
+
+typedef struct
+{
+	const char *name;
+	PRUint16	number;
+}			NSSCiphers;
+
+#define INVALID_CIPHER	0xFFFF
+
+static const NSSSignatureAlgorithms NSS_SCRAMDigestAlgorithm[] = {
+
+	{SEC_OID_PKCS1_MD5_WITH_RSA_ENCRYPTION, SEC_OID_SHA256, SHA256_LENGTH},
+	{SEC_OID_PKCS1_SHA1_WITH_RSA_ENCRYPTION, SEC_OID_SHA256, SHA256_LENGTH},
+	{SEC_OID_ISO_SHA_WITH_RSA_SIGNATURE, SEC_OID_SHA256, SHA256_LENGTH},
+	{SEC_OID_ISO_SHA1_WITH_RSA_SIGNATURE, SEC_OID_SHA256, SHA256_LENGTH},
+	{SEC_OID_PKCS5_PBE_WITH_MD5_AND_DES_CBC, SEC_OID_SHA256, SHA256_LENGTH},
+
+	{SEC_OID_ANSIX962_ECDSA_SHA224_SIGNATURE, SEC_OID_SHA224, SHA224_LENGTH},
+	{SEC_OID_PKCS1_SHA224_WITH_RSA_ENCRYPTION, SEC_OID_SHA224, SHA224_LENGTH},
+	{SEC_OID_NIST_DSA_SIGNATURE_WITH_SHA224_DIGEST, SEC_OID_SHA224, SHA224_LENGTH},
+
+	{SEC_OID_ANSIX962_ECDSA_SHA256_SIGNATURE, SEC_OID_SHA256, SHA256_LENGTH},
+	{SEC_OID_PKCS1_SHA256_WITH_RSA_ENCRYPTION, SEC_OID_SHA256, SHA256_LENGTH},
+	{SEC_OID_NIST_DSA_SIGNATURE_WITH_SHA256_DIGEST, SEC_OID_SHA256, SHA256_LENGTH},
+
+	{SEC_OID_ANSIX962_ECDSA_SHA384_SIGNATURE, SEC_OID_SHA384, SHA384_LENGTH},
+	{SEC_OID_PKCS1_SHA384_WITH_RSA_ENCRYPTION, SEC_OID_SHA384, SHA384_LENGTH},
+
+	{SEC_OID_ANSIX962_ECDSA_SHA512_SIGNATURE, SEC_OID_SHA512, SHA512_LENGTH},
+	{SEC_OID_PKCS1_SHA512_WITH_RSA_ENCRYPTION, SEC_OID_SHA512, SHA512_LENGTH},
+
+	{0, 0}
+};
+
+/*
+ * This list is a partial copy of the ciphers in NSS files lib/ssl/sslproto.h
+ * in order to provide a human readable version of the ciphers. It would be
+ * nice to not have to have this, but NSS doesn't provide any API addressing
+ * the ciphers by name. TODO: do we want more of the ciphers, or perhaps less?
+ */
+static const NSSCiphers NSS_CipherList[] = {
+
+	{"TLS_NULL_WITH_NULL_NULL", TLS_NULL_WITH_NULL_NULL},
+
+	{"TLS_RSA_WITH_NULL_MD5", TLS_RSA_WITH_NULL_MD5},
+	{"TLS_RSA_WITH_NULL_SHA", TLS_RSA_WITH_NULL_SHA},
+	{"TLS_RSA_WITH_RC4_128_MD5", TLS_RSA_WITH_RC4_128_MD5},
+	{"TLS_RSA_WITH_RC4_128_SHA", TLS_RSA_WITH_RC4_128_SHA},
+	{"TLS_RSA_WITH_IDEA_CBC_SHA", TLS_RSA_WITH_IDEA_CBC_SHA},
+	{"TLS_RSA_WITH_DES_CBC_SHA", TLS_RSA_WITH_DES_CBC_SHA},
+	{"TLS_RSA_WITH_3DES_EDE_CBC_SHA", TLS_RSA_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_DH_DSS_WITH_DES_CBC_SHA", TLS_DH_DSS_WITH_DES_CBC_SHA},
+	{"TLS_DH_DSS_WITH_3DES_EDE_CBC_SHA", TLS_DH_DSS_WITH_3DES_EDE_CBC_SHA},
+	{"TLS_DH_RSA_WITH_DES_CBC_SHA", TLS_DH_RSA_WITH_DES_CBC_SHA},
+	{"TLS_DH_RSA_WITH_3DES_EDE_CBC_SHA", TLS_DH_RSA_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_DHE_DSS_WITH_DES_CBC_SHA", TLS_DHE_DSS_WITH_DES_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_3DES_EDE_CBC_SHA", TLS_DHE_DSS_WITH_3DES_EDE_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_DES_CBC_SHA", TLS_DHE_RSA_WITH_DES_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA", TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_DH_anon_WITH_RC4_128_MD5", TLS_DH_anon_WITH_RC4_128_MD5},
+	{"TLS_DH_anon_WITH_DES_CBC_SHA", TLS_DH_anon_WITH_DES_CBC_SHA},
+	{"TLS_DH_anon_WITH_3DES_EDE_CBC_SHA", TLS_DH_anon_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_RSA_WITH_AES_128_CBC_SHA", TLS_RSA_WITH_AES_128_CBC_SHA},
+	{"TLS_DH_DSS_WITH_AES_128_CBC_SHA", TLS_DH_DSS_WITH_AES_128_CBC_SHA},
+	{"TLS_DH_RSA_WITH_AES_128_CBC_SHA", TLS_DH_RSA_WITH_AES_128_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_AES_128_CBC_SHA", TLS_DHE_DSS_WITH_AES_128_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_AES_128_CBC_SHA", TLS_DHE_RSA_WITH_AES_128_CBC_SHA},
+	{"TLS_DH_anon_WITH_AES_128_CBC_SHA", TLS_DH_anon_WITH_AES_128_CBC_SHA},
+
+	{"TLS_RSA_WITH_AES_256_CBC_SHA", TLS_RSA_WITH_AES_256_CBC_SHA},
+	{"TLS_DH_DSS_WITH_AES_256_CBC_SHA", TLS_DH_DSS_WITH_AES_256_CBC_SHA},
+	{"TLS_DH_RSA_WITH_AES_256_CBC_SHA", TLS_DH_RSA_WITH_AES_256_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_AES_256_CBC_SHA", TLS_DHE_DSS_WITH_AES_256_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_AES_256_CBC_SHA", TLS_DHE_RSA_WITH_AES_256_CBC_SHA},
+	{"TLS_DH_anon_WITH_AES_256_CBC_SHA", TLS_DH_anon_WITH_AES_256_CBC_SHA},
+	{"TLS_RSA_WITH_NULL_SHA256", TLS_RSA_WITH_NULL_SHA256},
+	{"TLS_RSA_WITH_AES_128_CBC_SHA256", TLS_RSA_WITH_AES_128_CBC_SHA256},
+	{"TLS_RSA_WITH_AES_256_CBC_SHA256", TLS_RSA_WITH_AES_256_CBC_SHA256},
+
+	{"TLS_DHE_DSS_WITH_AES_128_CBC_SHA256", TLS_DHE_DSS_WITH_AES_128_CBC_SHA256},
+	{"TLS_RSA_WITH_CAMELLIA_128_CBC_SHA", TLS_RSA_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DH_DSS_WITH_CAMELLIA_128_CBC_SHA", TLS_DH_DSS_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DH_RSA_WITH_CAMELLIA_128_CBC_SHA", TLS_DH_RSA_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_CAMELLIA_128_CBC_SHA", TLS_DHE_DSS_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA", TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DH_anon_WITH_CAMELLIA_128_CBC_SHA", TLS_DH_anon_WITH_CAMELLIA_128_CBC_SHA},
+
+	{"TLS_DHE_DSS_WITH_RC4_128_SHA", TLS_DHE_DSS_WITH_RC4_128_SHA},
+	{"TLS_DHE_RSA_WITH_AES_128_CBC_SHA256", TLS_DHE_RSA_WITH_AES_128_CBC_SHA256},
+	{"TLS_DHE_DSS_WITH_AES_256_CBC_SHA256", TLS_DHE_DSS_WITH_AES_256_CBC_SHA256},
+	{"TLS_DHE_RSA_WITH_AES_256_CBC_SHA256", TLS_DHE_RSA_WITH_AES_256_CBC_SHA256},
+
+	{"TLS_RSA_WITH_CAMELLIA_256_CBC_SHA", TLS_RSA_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DH_DSS_WITH_CAMELLIA_256_CBC_SHA", TLS_DH_DSS_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DH_RSA_WITH_CAMELLIA_256_CBC_SHA", TLS_DH_RSA_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_CAMELLIA_256_CBC_SHA", TLS_DHE_DSS_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA", TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DH_anon_WITH_CAMELLIA_256_CBC_SHA", TLS_DH_anon_WITH_CAMELLIA_256_CBC_SHA},
+
+	{"TLS_RSA_WITH_SEED_CBC_SHA", TLS_RSA_WITH_SEED_CBC_SHA},
+
+	{"TLS_RSA_WITH_AES_128_GCM_SHA256", TLS_RSA_WITH_AES_128_GCM_SHA256},
+	{"TLS_RSA_WITH_AES_256_GCM_SHA384", TLS_RSA_WITH_AES_256_GCM_SHA384},
+	{"TLS_DHE_RSA_WITH_AES_128_GCM_SHA256", TLS_DHE_RSA_WITH_AES_128_GCM_SHA256},
+	{"TLS_DHE_RSA_WITH_AES_256_GCM_SHA384", TLS_DHE_RSA_WITH_AES_256_GCM_SHA384},
+	{"TLS_DHE_DSS_WITH_AES_128_GCM_SHA256", TLS_DHE_DSS_WITH_AES_128_GCM_SHA256},
+	{"TLS_DHE_DSS_WITH_AES_256_GCM_SHA384", TLS_DHE_DSS_WITH_AES_256_GCM_SHA384},
+
+	{"TLS_AES_128_GCM_SHA256", TLS_AES_128_GCM_SHA256},
+	{"TLS_AES_256_GCM_SHA384", TLS_AES_256_GCM_SHA384},
+	{"TLS_CHACHA20_POLY1305_SHA256", TLS_CHACHA20_POLY1305_SHA256},
+	{NULL, 0}
+};
+
+/*
+ * pg_find_cipher
+ *			Translate an NSS ciphername to the cipher code
+ *
+ * Searches the configured ciphers for the corresponding cipher code to the
+ * name. Search is performed case insensitive.
+ */
+PRUint16
+pg_find_cipher(char *name)
+{
+	const		NSSCiphers *cipher_list = NSS_CipherList;
+
+	while (cipher_list->name)
+	{
+		if (pg_strcasecmp(cipher_list->name, name) == 0)
+			return cipher_list->number;
+
+		cipher_list++;
+	}
+
+	return 0xFFFF;
+}
+
+#endif							/* USE_NSS */
+
+#endif							/* PG_NSS_H */
diff --git a/src/include/libpq/libpq-be.h b/src/include/libpq/libpq-be.h
index 66a8673d93..ea373a0ae0 100644
--- a/src/include/libpq/libpq-be.h
+++ b/src/include/libpq/libpq-be.h
@@ -193,13 +193,18 @@ typedef struct Port
 	bool		peer_cert_valid;
 
 	/*
-	 * OpenSSL structures. (Keep these last so that the locations of other
-	 * fields are the same whether or not you build with OpenSSL.)
+	 * SSL backend specific structures. (Keep these last so that the locations
+	 * of other fields are the same whether or not you build with SSL
+	 * enabled.)
 	 */
 #ifdef USE_OPENSSL
 	SSL		   *ssl;
 	X509	   *peer;
 #endif
+
+#ifdef USE_NSS
+	void	   *pr_fd;
+#endif
 } Port;
 
 #ifdef USE_SSL
@@ -283,7 +288,7 @@ extern void be_tls_get_peer_serial(Port *port, char *ptr, size_t len);
  * This is not supported with old versions of OpenSSL that don't have
  * the X509_get_signature_nid() function.
  */
-#if defined(USE_OPENSSL) && defined(HAVE_X509_GET_SIGNATURE_NID)
+#if defined(USE_NSS) || (defined(USE_OPENSSL) && defined(HAVE_X509_GET_SIGNATURE_NID))
 #define HAVE_BE_TLS_GET_CERTIFICATE_HASH
 extern char *be_tls_get_certificate_hash(Port *port, size_t *len);
 #endif
@@ -293,6 +298,10 @@ extern char *be_tls_get_certificate_hash(Port *port, size_t *len);
 typedef void (*openssl_tls_init_hook_typ) (SSL_CTX *context, bool isServerStart);
 extern PGDLLIMPORT openssl_tls_init_hook_typ openssl_tls_init_hook;
 #endif
+#ifdef USE_NSS
+typedef void (*nss_tls_init_hook_type) (bool isServerStart);
+extern PGDLLIMPORT nss_tls_init_hook_type nss_tls_init_hook;
+#endif
 
 #endif							/* USE_SSL */
 
diff --git a/src/include/libpq/libpq.h b/src/include/libpq/libpq.h
index a55898c85a..d2860b852f 100644
--- a/src/include/libpq/libpq.h
+++ b/src/include/libpq/libpq.h
@@ -88,6 +88,9 @@ extern PGDLLIMPORT bool ssl_passphrase_command_supports_reload;
 #ifdef USE_SSL
 extern bool ssl_loaded_verify_locations;
 #endif
+#ifdef USE_NSS
+extern char *ssl_database;
+#endif
 
 extern int	secure_initialize(bool isServerStart);
 extern bool secure_loaded_verify_locations(void);
diff --git a/src/include/pg_config.h.in b/src/include/pg_config.h.in
index 55cab4d2bf..8856a33590 100644
--- a/src/include/pg_config.h.in
+++ b/src/include/pg_config.h.in
@@ -905,6 +905,9 @@
 /* Define to 1 to build with PAM support. (--with-pam) */
 #undef USE_PAM
 
+/* Define to build with NSS support (--with-ssl=nss) */
+#undef USE_NSS
+
 /* Define to 1 to use software CRC-32C implementation (slicing-by-8). */
 #undef USE_SLICING_BY_8_CRC32C
 
diff --git a/src/include/pg_config_manual.h b/src/include/pg_config_manual.h
index d27c8601fa..7861b94290 100644
--- a/src/include/pg_config_manual.h
+++ b/src/include/pg_config_manual.h
@@ -176,10 +176,9 @@
 
 /*
  * USE_SSL code should be compiled only when compiling with an SSL
- * implementation.  (Currently, only OpenSSL is supported, but we might add
- * more implementations in the future.)
+ * implementation.
  */
-#ifdef USE_OPENSSL
+#if defined(USE_OPENSSL) || defined(USE_NSS)
 #define USE_SSL
 #endif
 
diff --git a/src/interfaces/libpq/Makefile b/src/interfaces/libpq/Makefile
index f74677eaf9..e10d8bef42 100644
--- a/src/interfaces/libpq/Makefile
+++ b/src/interfaces/libpq/Makefile
@@ -56,6 +56,11 @@ OBJS += \
 	fe-secure-openssl.o
 endif
 
+ifeq ($(with_ssl), nss)
+OBJS += \
+	fe-secure-nss.o
+endif
+
 ifeq ($(with_gssapi),yes)
 OBJS += \
 	fe-gssapi-common.o \
diff --git a/src/interfaces/libpq/fe-connect.c b/src/interfaces/libpq/fe-connect.c
index 8ca0583aa9..1eeeff54a8 100644
--- a/src/interfaces/libpq/fe-connect.c
+++ b/src/interfaces/libpq/fe-connect.c
@@ -355,6 +355,10 @@ static const internalPQconninfoOption PQconninfoOptions[] = {
 		"Target-Session-Attrs", "", 11, /* sizeof("read-write") = 11 */
 	offsetof(struct pg_conn, target_session_attrs)},
 
+	{"cert_database", NULL, NULL, NULL,
+		"CertificateDatabase", "", 64,
+	offsetof(struct pg_conn, cert_database)},
+
 	/* Terminating entry --- MUST BE LAST */
 	{NULL, NULL, NULL, NULL,
 	NULL, NULL, 0}
diff --git a/src/interfaces/libpq/fe-secure-nss.c b/src/interfaces/libpq/fe-secure-nss.c
new file mode 100644
index 0000000000..dca0572e67
--- /dev/null
+++ b/src/interfaces/libpq/fe-secure-nss.c
@@ -0,0 +1,1112 @@
+/*-------------------------------------------------------------------------
+ *
+ * fe-secure-nss.c
+ *	  functions for supporting NSS as a TLS backend for frontend libpq
+ *
+ * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ *	  src/interfaces/libpq/fe-secure-nss.c
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#include "postgres_fe.h"
+
+#include "libpq-fe.h"
+#include "fe-auth.h"
+#include "fe-secure-common.h"
+#include "libpq-int.h"
+#include "common/pg_nss.h"
+
+/*
+ * BITS_PER_BYTE is also defined in the NSPR header files, so we need to undef
+ * our version to avoid compiler warnings on redefinition.
+ */
+#define pg_BITS_PER_BYTE BITS_PER_BYTE
+#undef BITS_PER_BYTE
+
+/*
+ * The nspr/obsolete/protypes.h NSPR header typedefs uint64 and int64 with
+ * colliding definitions from ours, causing a much expected compiler error.
+ * Remove backwards compatibility with ancient NSPR versions to avoid this.
+ */
+#define NO_NSPR_10_SUPPORT
+#include <nspr/nspr.h>
+#include <nspr/prerror.h>
+#include <nspr/prinit.h>
+#include <nspr/prio.h>
+#include <nss/hasht.h>
+#include <nss/nss.h>
+#include <nss/ssl.h>
+#include <nss/sslproto.h>
+#include <nss/pk11func.h>
+#include <nss/secerr.h>
+#include <nss/secoidt.h>
+#include <nss/secmod.h>
+
+/*
+ * Ensure that the colliding definitions match, else throw an error. In case
+ * NSPR remove the definition in a future version (however unlikely that may
+ * be, make sure to put ours back again.
+ */
+#if defined(BITS_PER_BYTE)
+#if BITS_PER_BYTE != pg_BITS_PER_BYTE
+#error "incompatible byte widths between NSPR and PostgreSQL"
+#endif
+#else
+#define BITS_PER_BYTE pg_BITS_PER_BYTE
+#endif
+#undef pg_BITS_PER_BYTE
+
+static SECStatus pg_load_nss_module(SECMODModule * *module, const char *library, const char *name);
+static SECStatus pg_bad_cert_handler(void *arg, PRFileDesc * fd);
+static const char *pg_SSLerrmessage(PRErrorCode errcode);
+static SECStatus pg_client_auth_handler(void *arg, PRFileDesc * socket, CERTDistNames * caNames,
+										CERTCertificate * *pRetCert, SECKEYPrivateKey * *pRetKey);
+static SECStatus pg_cert_auth_handler(void *arg, PRFileDesc * fd, PRBool checksig, PRBool isServer);
+static int	ssl_protocol_version_to_nss(const char *protocol);
+static bool cert_database_has_CA(PGconn *conn);
+
+static char *PQssl_passwd_cb(PK11SlotInfo * slot, PRBool retry, void *arg);
+
+/*
+ * PR_ImportTCPSocket() is a private API, but very widely used, as it's the
+ * only way to make NSS use an already set up POSIX file descriptor rather
+ * than opening one itself. To quote the NSS documentation:
+ *
+ *		"In theory, code that uses PR_ImportTCPSocket may break when NSPR's
+ *		implementation changes. In practice, this is unlikely to happen because
+ *		NSPR's implementation has been stable for years and because of NSPR's
+ *		strong commitment to backward compatibility."
+ *
+ * https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSPR/Reference/PR_ImportTCPSocket
+ *
+ * The function is declared in <private/pprio.h>, but as it is a header marked
+ * private we declare it here rather than including it.
+ */
+NSPR_API(PRFileDesc *) PR_ImportTCPSocket(int);
+
+static SECMODModule * ca_trust = NULL;
+static NSSInitContext * nss_context = NULL;
+
+/*
+ * This logic exist in NSS as well, but it's only available for when there is
+ * a database to open, and not only using the system trust store. Thus, we
+ * need to keep our own copy.
+ */
+#if defined(WIN32)
+static const char *ca_trust_name = "nssckbi.dll";
+#elif defined(__darwin__)
+static const char *ca_trust_name = "libnssckbi.dylib";
+#else
+static const char *ca_trust_name = "libnssckbi.so";
+#endif
+
+static PQsslKeyPassHook_nss_type PQsslKeyPassHook = NULL;
+
+/* ------------------------------------------------------------ */
+/*			 Procedures common to all secure sessions			*/
+/* ------------------------------------------------------------ */
+
+/*
+ * pgtls_init_library
+ *
+ * There is no direct equivalent for PQinitOpenSSL in NSS/NSPR, with PR_Init
+ * being the closest match there is. PR_Init is however already documented to
+ * not be required so simply making this a noop seems like the best option.
+ */
+void
+pgtls_init_library(bool do_ssl, int do_crypto)
+{
+	/* noop */
+}
+
+int
+pgtls_init(PGconn *conn)
+{
+	conn->ssl_in_use = false;
+	conn->has_password = false;
+
+	return 0;
+}
+
+void
+pgtls_close(PGconn *conn)
+{
+	if (nss_context)
+	{
+		NSS_ShutdownContext(nss_context);
+		nss_context = NULL;
+	}
+}
+
+PostgresPollingStatusType
+pgtls_open_client(PGconn *conn)
+{
+	SECStatus	status;
+	PRFileDesc *pr_fd;
+	PRFileDesc *model;
+	NSSInitParameters params;
+	SSLVersionRange desired_range;
+
+	/*
+	 * The NSPR documentation states that runtime initialization via PR_Init
+	 * is no longer required, as the first caller into NSPR will perform the
+	 * initialization implicitly. See be-secure-nss.c for further discussion
+	 * on PR_Init.
+	 */
+	PR_Init(PR_USER_THREAD, PR_PRIORITY_NORMAL, 0);
+
+	/*
+	 * NSS initialization and the use of contexts is further discussed in
+	 * be-secure-nss.c
+	 */
+	memset(&params, 0, sizeof(params));
+	params.length = sizeof(params);
+
+	if (conn->cert_database && strlen(conn->cert_database) > 0)
+	{
+		char	   *cert_database_path = psprintf("sql:%s", conn->cert_database);
+
+		nss_context = NSS_InitContext(cert_database_path, "", "", "",
+									  &params,
+									  NSS_INIT_READONLY | NSS_INIT_PK11RELOAD);
+		pfree(cert_database_path);
+
+		if (!nss_context)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("unable to open certificate database \"%s\": %s"),
+							  conn->cert_database,
+							  pg_SSLerrmessage(PR_GetError()));
+			return PGRES_POLLING_FAILED;
+		}
+	}
+	else
+	{
+		nss_context = NSS_InitContext("", "", "", "", &params,
+									  NSS_INIT_READONLY | NSS_INIT_NOCERTDB |
+									  NSS_INIT_NOMODDB | NSS_INIT_FORCEOPEN |
+									  NSS_INIT_NOROOTINIT | NSS_INIT_PK11RELOAD);
+		if (!nss_context)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("unable to create certificate database: %s"),
+							  pg_SSLerrmessage(PR_GetError()));
+			return PGRES_POLLING_FAILED;
+		}
+	}
+
+	/*
+	 * Configure cipher policy.
+	 */
+	status = NSS_SetDomesticPolicy();
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to configure cipher policy: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * If we don't have a certificate database, the system trust store is the
+	 * fallback we can use. If we fail to initialize that as well, we can
+	 * still attempt a connection as long as the sslmode isn't verify*.
+	 */
+	if (!conn->cert_database && conn->sslmode[0] == 'v')
+	{
+		status = pg_load_nss_module(&ca_trust, ca_trust_name, "\"Root Certificates\"");
+		if (status != SECSuccess)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("WARNING: unable to load NSS trust module \"%s\" : %s"),
+							  ca_trust_name,
+							  pg_SSLerrmessage(PR_GetError()));
+
+			return PGRES_POLLING_FAILED;
+		}
+	}
+
+
+	PK11_SetPasswordFunc(PQssl_passwd_cb);
+
+	/*
+	 * Import the already opened socket as we don't want to use NSPR functions
+	 * for opening the network socket due to how the PostgreSQL protocol works
+	 * with TLS connections. This function is not part of the NSPR public API,
+	 * see the comment at the top of the file for the rationale of still using
+	 * it.
+	 */
+	pr_fd = PR_ImportTCPSocket(conn->sock);
+	if (!pr_fd)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to attach to socket: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * Most of the documentation available, and implementations of, NSS/NSPR
+	 * use the PR_NewTCPSocket() function here, which has the drawback that it
+	 * can only create IPv4 sockets. Instead use PR_OpenTCPSocket() which
+	 * copes with IPv6 as well.
+	 */
+	model = SSL_ImportFD(NULL, PR_OpenTCPSocket(conn->laddr.addr.ss_family));
+	if (!model)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to enable TLS: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/* Disable old protocol versions (SSLv2 and SSLv3) */
+	SSL_OptionSet(model, SSL_ENABLE_SSL2, PR_FALSE);
+	SSL_OptionSet(model, SSL_V2_COMPATIBLE_HELLO, PR_FALSE);
+	SSL_OptionSet(model, SSL_ENABLE_SSL3, PR_FALSE);
+
+#ifdef SSL_CBC_RANDOM_IV
+
+	/*
+	 * Enable protection against the BEAST attack in case the NSS library has
+	 * support for that. While SSLv3 is disabled, we may still allow TLSv1
+	 * which is affected. The option isn't documented as an SSL option, but as
+	 * an NSS environment variable.
+	 */
+	SSL_OptionSet(model, SSL_CBC_RANDOM_IV, PR_TRUE);
+#endif
+
+	/* Set us up as a TLS client for the handshake */
+	SSL_OptionSet(model, SSL_HANDSHAKE_AS_CLIENT, PR_TRUE);
+
+	/*
+	 * When setting the available protocols, we either use the user defined
+	 * configuration values, and if missing we accept whatever is the highest
+	 * version supported by the library as the max and only limit the range in
+	 * the other end at TLSv1.0. ssl_variant_stream is a ProtocolVariant enum
+	 * for Stream protocols, rather than datagram.
+	 */
+	SSL_VersionRangeGetSupported(ssl_variant_stream, &desired_range);
+	desired_range.min = SSL_LIBRARY_VERSION_TLS_1_0;
+
+	if (conn->ssl_min_protocol_version && strlen(conn->ssl_min_protocol_version) > 0)
+	{
+		int			ssl_min_ver = ssl_protocol_version_to_nss(conn->ssl_min_protocol_version);
+
+		if (ssl_min_ver == -1)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("invalid value \"%s\" for minimum version of SSL protocol\n"),
+							  conn->ssl_min_protocol_version);
+			return -1;
+		}
+
+		desired_range.min = ssl_min_ver;
+	}
+
+	if (conn->ssl_max_protocol_version && strlen(conn->ssl_max_protocol_version) > 0)
+	{
+		int			ssl_max_ver = ssl_protocol_version_to_nss(conn->ssl_max_protocol_version);
+
+		if (ssl_max_ver == -1)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("invalid value \"%s\" for maximum version of SSL protocol\n"),
+							  conn->ssl_max_protocol_version);
+			return -1;
+		}
+
+		desired_range.max = ssl_max_ver;
+	}
+
+	if (SSL_VersionRangeSet(model, &desired_range) != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to set allowed SSL protocol version range: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * Set up callback for verifying server certificates, as well as for how
+	 * to handle failed verifications.
+	 */
+	SSL_AuthCertificateHook(model, pg_cert_auth_handler, (void *) conn);
+	SSL_BadCertHook(model, pg_bad_cert_handler, (void *) conn);
+
+	/*
+	 * Convert the NSPR socket to an SSL socket. Ensuring the success of this
+	 * operation is critical as NSS SSL_* functions may return SECSuccess on
+	 * the socket even though SSL hasn't been enabled, which introduce a risk
+	 * of silent downgrades.
+	 */
+	conn->pr_fd = SSL_ImportFD(model, pr_fd);
+	if (!conn->pr_fd)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to configure client for TLS: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * The model can now we closed as we've applied the settings of the model
+	 * onto the real socket. From hereon we should only use conn->pr_fd.
+	 */
+	PR_Close(model);
+
+	/* Set the private data to be passed to the password callback */
+	SSL_SetPKCS11PinArg(conn->pr_fd, (void *) conn);
+
+	/*
+	 * If a CRL file has been specified, verify if it exists in the database
+	 * but don't fail in case it doesn't.
+	 */
+	if (conn->sslcrl && strlen(conn->sslcrl) > 0)
+	{
+		/* XXX: Implement me.. */
+	}
+
+	status = SSL_ResetHandshake(conn->pr_fd, PR_FALSE);
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to initiate handshake: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * Set callback for client authentication when requested by the server.
+	 */
+	SSL_GetClientAuthDataHook(conn->pr_fd, pg_client_auth_handler, (void *) conn);
+
+	/*
+	 * Specify which hostname we are expecting to talk to. This is required,
+	 * albeit mostly applies to when opening a connection to a traditional
+	 * http server it seems.
+	 */
+	SSL_SetURL(conn->pr_fd, (conn->connhost[conn->whichhost]).host);
+
+	do
+	{
+		status = SSL_ForceHandshake(conn->pr_fd);
+	}
+	while (status != SECSuccess && PR_GetError() == PR_WOULD_BLOCK_ERROR);
+
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("SSL error: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	conn->ssl_in_use = true;
+	return PGRES_POLLING_OK;
+}
+
+ssize_t
+pgtls_read(PGconn *conn, void *ptr, size_t len)
+{
+	PRInt32		nread;
+	PRErrorCode status;
+	int			read_errno = 0;
+
+	/*
+	 * PR_Recv blocks until there is data to read or the timeout expires. We
+	 * don't want to sit blocked here, so the timeout is turned off by using
+	 * PR_INTERVAL_NO_WAIT which means "return immediately",  Zero is returned
+	 * for closed connections, while -1 indicates an error within the ongoing
+	 * connection.
+	 */
+	nread = PR_Recv(conn->pr_fd, ptr, len, 0, PR_INTERVAL_NO_WAIT);
+
+	if (nread == 0)
+	{
+		read_errno = ECONNRESET;
+		nread = -1;
+	}
+	else if (nread == -1)
+	{
+		status = PR_GetError();
+
+		switch (status)
+		{
+			case PR_IO_TIMEOUT_ERROR:
+				/* No data available yet. */
+				nread = 0;
+				break;
+
+			case PR_WOULD_BLOCK_ERROR:
+				read_errno = EWOULDBLOCK;
+				break;
+
+				/*
+				 * The error cases for PR_Recv are not documented, but can be
+				 * reverse engineered from _MD_unix_map_default_error() in the
+				 * NSPR code, defined in pr/src/md/unix/unix_errors.c.
+				 */
+			case PR_NETWORK_UNREACHABLE_ERROR:
+			case PR_CONNECT_RESET_ERROR:
+				read_errno = ECONNRESET;
+				break;
+
+			default:
+				break;
+		}
+
+		if (nread == -1)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("TLS read error: %s"),
+							  pg_SSLerrmessage(status));
+		}
+	}
+
+	SOCK_ERRNO_SET(read_errno);
+	return (ssize_t) nread;
+}
+
+/*
+ * pgtls_read_pending
+ *		Check for the existence of data to be read.
+ *
+ * This is part of the PostgreSQL TLS backend API.
+ */
+bool
+pgtls_read_pending(PGconn *conn)
+{
+	unsigned char c;
+	int			n;
+
+	/*
+	 * PR_Recv peeks into the stream with the timeount turned off, to see if
+	 * there is another byte to read off the wire. There is an NSS function
+	 * SSL_DataPending() which might seem like a better fit, but it will only
+	 * check already encrypted data in the SSL buffer, not still unencrypted
+	 * data, thus it doesn't guarantee that a subsequent call to
+	 * PR_Read/PR_Recv won't block.
+	 */
+	n = PR_Recv(conn->pr_fd, &c, 1, PR_MSG_PEEK, PR_INTERVAL_NO_WAIT);
+	return (n > 0);
+}
+
+ssize_t
+pgtls_write(PGconn *conn, const void *ptr, size_t len)
+{
+	PRInt32		n;
+	PRErrorCode status;
+	int			write_errno = 0;
+
+	n = PR_Write(conn->pr_fd, ptr, len);
+
+	if (n < 0)
+	{
+		status = PR_GetError();
+
+		switch (status)
+		{
+			case PR_WOULD_BLOCK_ERROR:
+#ifdef EAGAIN
+				write_errno = EAGAIN;
+#else
+				write_errno = EINTR;
+#endif
+				break;
+
+			default:
+				printfPQExpBuffer(&conn->errorMessage,
+								  libpq_gettext("TLS write error: %s"),
+								  pg_SSLerrmessage(status));
+				write_errno = ECONNRESET;
+				break;
+		}
+	}
+
+	SOCK_ERRNO_SET(write_errno);
+	return (ssize_t) n;
+}
+
+char *
+pgtls_get_peer_certificate_hash(PGconn *conn, size_t *len)
+{
+	CERTCertificate *server_cert;
+	SECOidTag	signature_alg;
+	SECOidTag	digest_alg;
+	int			digest_len;
+	const NSSSignatureAlgorithms *candidate;
+	PLArenaPool *arena;
+	SECItem		digest;
+	char	   *ret;
+	SECStatus	status;
+
+	*len = 0;
+
+	server_cert = SSL_PeerCertificate(conn->pr_fd);
+	if (!server_cert)
+		return NULL;
+
+	signature_alg = SECOID_GetAlgorithmTag(&server_cert->signature);
+
+	candidate = NSS_SCRAMDigestAlgorithm;
+	while (candidate->signature)
+	{
+		if (signature_alg == candidate->signature)
+		{
+			digest_alg = candidate->hash;
+			digest_len = candidate->len;
+			break;
+		}
+
+		candidate++;
+	}
+
+	if (!candidate->signature)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("could not find digest for OID '%s'\n"),
+						  SECOID_FindOIDTagDescription(signature_alg));
+		return NULL;
+	}
+
+	arena = PORT_NewArena(SEC_ASN1_DEFAULT_ARENA_SIZE);
+	digest.data = PORT_ArenaZAlloc(arena, sizeof(unsigned char) * digest_len);
+	digest.len = digest_len;
+
+	status = PK11_HashBuf(digest_alg, digest.data, server_cert->derCert.data,
+						  server_cert->derCert.len);
+
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to generate peer certificate digest: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		PORT_FreeArena(arena, PR_TRUE);
+		return NULL;
+	}
+
+	ret = pg_malloc(digest.len);
+	memcpy(ret, digest.data, digest.len);
+	*len = digest_len;
+	PORT_FreeArena(arena, PR_TRUE);
+
+	return ret;
+}
+
+/*
+ *	Verify that the server certificate matches the hostname we connected to.
+ *
+ * The certificate's Common Name and Subject Alternative Names are considered.
+ */
+int
+pgtls_verify_peer_name_matches_certificate_guts(PGconn *conn,
+												int *names_examined,
+												char **first_name)
+{
+	char	   *server_hostname = NULL;
+	CERTCertificate *server_cert = NULL;
+	SECStatus	status = SECSuccess;
+	SECItem		altname_item;
+	PLArenaPool *arena = NULL;
+	CERTGeneralName *san_list;
+	CERTGeneralName *cn;
+
+	server_hostname = SSL_RevealURL(conn->pr_fd);
+	if (!server_hostname || server_hostname[0] == '\0')
+		goto done;
+
+	/*
+	 * CERT_VerifyCertName will internally perform RFC 2818 SubjectAltName
+	 * verification.
+	 */
+	server_cert = SSL_PeerCertificate(conn->pr_fd);
+	status = CERT_VerifyCertName(server_cert, server_hostname);
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to verify server hostname: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		goto done;
+	}
+
+	status = CERT_FindCertExtension(server_cert, SEC_OID_X509_SUBJECT_ALT_NAME,
+									&altname_item);
+	if (status == SECSuccess)
+	{
+		arena = PORT_NewArena(DER_DEFAULT_CHUNKSIZE);
+		if (!arena)
+		{
+			status = SECFailure;
+			goto done;
+		}
+		san_list = CERT_DecodeAltNameExtension(arena, &altname_item);
+		if (!san_list)
+		{
+			status = SECFailure;
+			goto done;
+		}
+
+		for (cn = san_list; cn != san_list; cn = CERT_GetNextGeneralName(cn))
+		{
+			char	   *alt_name;
+			int			rv;
+			char		tmp[512];
+
+			status = CERT_RFC1485_EscapeAndQuote(tmp, sizeof(tmp),
+												 (char *) cn->name.other.data,
+												 cn->name.other.len);
+
+			if (status != SECSuccess)
+				goto done;
+
+			rv = pq_verify_peer_name_matches_certificate_name(conn, tmp,
+															  strlen(tmp),
+															  &alt_name);
+			if (alt_name)
+			{
+				if (!*first_name)
+					*first_name = alt_name;
+				else
+					free(alt_name);
+			}
+
+			if (rv == 1)
+				status = SECSuccess;
+			else
+			{
+				status = SECFailure;
+				break;
+			}
+		}
+	}
+	else if (PORT_GetError() == SEC_ERROR_EXTENSION_NOT_FOUND)
+		status = SECSuccess;
+	else
+		status = SECSuccess;
+
+done:
+	/* san_list will be freed by freeing the arena it was allocated in */
+	if (arena)
+		PORT_FreeArena(arena, PR_TRUE);
+	PR_Free(server_hostname);
+
+	if (status == SECSuccess)
+		return 1;
+
+	return 0;
+}
+
+/* ------------------------------------------------------------ */
+/*			PostgreSQL specific TLS support functions			*/
+/* ------------------------------------------------------------ */
+
+static const char *
+pg_SSLerrmessage(PRErrorCode errcode)
+{
+	const char *error;
+
+	/*
+	 * Try to get the user friendly error description, and if that fails try
+	 * to fall back on the name of the PRErrorCode.
+	 */
+	error = PR_ErrorToString(errcode, PR_LANGUAGE_I_DEFAULT);
+	if (!error)
+		error = PR_ErrorToName(errcode);
+	if (error)
+		return error;
+
+	return "unknown TLS error";
+}
+
+static SECStatus
+pg_load_nss_module(SECMODModule * *module, const char *library, const char *name)
+{
+	SECMODModule *mod;
+	char	   *modulespec;
+
+	modulespec = psprintf("library=\"%s\", name=\"%s\"", library, name);
+
+	/*
+	 * Attempt to load the specified module. The second parameter is "parent"
+	 * which should always be NULL for application code. The third parameter
+	 * defines if loading should recurse which is only applicable when loading
+	 * a module from within another module. This hierarchy would have to be
+	 * defined in the modulespec, and since we don't support anything but
+	 * directly addressed modules we should pass PR_FALSE.
+	 */
+	mod = SECMOD_LoadUserModule(modulespec, NULL, PR_FALSE);
+	pfree(modulespec);
+
+	if (mod && mod->loaded)
+	{
+		*module = mod;
+		return SECSuccess;
+	}
+
+	SECMOD_DestroyModule(mod);
+	return SECFailure;
+}
+
+/* ------------------------------------------------------------ */
+/*						NSS Callbacks							*/
+/* ------------------------------------------------------------ */
+
+/*
+ * pg_cert_auth_handler
+ *			Callback for authenticating server certificate
+ *
+ * This is pretty much the same procedure as the SSL_AuthCertificate function
+ * provided by NSS, with the difference being server hostname validation. With
+ * SSL_AuthCertificate there is no way to do verify-ca, it only does the -full
+ * flavor of our sslmodes, so we need our own implementation.
+ */
+static SECStatus
+pg_cert_auth_handler(void *arg, PRFileDesc *fd, PRBool checksig, PRBool isServer)
+{
+	SECStatus	status;
+	PGconn	   *conn = (PGconn *) arg;
+	CERTCertificate *server_cert;
+	void	   *pin;
+
+	Assert(!isServer);
+
+	pin = SSL_RevealPinArg(conn->pr_fd);
+	server_cert = SSL_PeerCertificate(conn->pr_fd);
+
+	status = CERT_VerifyCertificateNow((CERTCertDBHandle *) CERT_GetDefaultCertDB(),
+									   server_cert,
+									   checksig,
+									   certificateUsageSSLServer,
+									   pin,
+									   NULL);
+
+	/*
+	 * If we've already failed validation then there is no point in also
+	 * performing the hostname check for verify-full.
+	 */
+	if (status == SECSuccess)
+	{
+		if (!pq_verify_peer_name_matches_certificate(conn))
+			status = SECFailure;
+	}
+	else
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to verify certificate: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+	}
+
+	return status;
+}
+
+/*
+ * pg_client_auth_handler
+ *		Callback for client certificate validation
+ *
+ * The client auth callback is not on by default in NSS, so we need to invoke
+ * it ourselves to ensure we can do cert authentication. A TODO is to support
+ * running without a specified sslcert parameter. By retrieving all the certs
+ * via nickname from the cert database and see if we find one which apply with
+ * NSS_CmpCertChainWCANames() and PK11_FindKeyByAnyCert() we could support
+ * just running with a ssl database specified.
+ *
+ * For now, we use the default client certificate validation which requires a
+ * defined nickname to identify the cert in the database.
+ */
+static SECStatus
+pg_client_auth_handler(void *arg, PRFileDesc * socket, CERTDistNames * caNames,
+					   CERTCertificate * *pRetCert, SECKEYPrivateKey * *pRetKey)
+{
+	PGconn	   *conn = (PGconn *) arg;
+
+	return NSS_GetClientAuthData(conn->sslcert, socket, caNames, pRetCert, pRetKey);
+}
+
+/*
+ * pg_bad_cert_handler
+ *		Callback for failed certificate validation
+ *
+ * The TLS handshake will call this function iff the server certificate failed
+ * validation. Depending on the sslmode, we allow the connection anyways.
+ */
+static SECStatus
+pg_bad_cert_handler(void *arg, PRFileDesc * fd)
+{
+	PGconn	   *conn = (PGconn *) arg;
+	PRErrorCode err;
+
+	/*
+	 * This really shouldn't happen, as we've set the PGconn object as our
+	 * callback data, and at the callsite we know it will be populated. That
+	 * being said, the NSS code itself performs this check even when it should
+	 * not be required so let's use the same belts with our suspenders.
+	 */
+	if (!arg)
+		return SECFailure;
+
+	/*
+	 * For sslmodes other than verify-full and verify-ca we don't perform peer
+	 * validation, so return immediately.  sslmode require with a database
+	 * specified which contains a CA certificate will work like verify-ca to
+	 * be compatible with the OpenSSL implementation.
+	 */
+	if (strcmp(conn->sslmode, "require") == 0)
+	{
+		if (conn->cert_database && strlen(conn->cert_database) > 0 && cert_database_has_CA(conn))
+			return SECFailure;
+	}
+	if (conn->sslmode[0] == 'v')
+		return SECFailure;
+
+	err = PORT_GetError();
+
+	/*
+	 * TODO: these are relevant error codes that can occur in certificate
+	 * validation, figure out which we don't want for require/prefer etc.
+	 */
+	switch (err)
+	{
+		case SEC_ERROR_INVALID_AVA:
+		case SEC_ERROR_INVALID_TIME:
+		case SEC_ERROR_BAD_SIGNATURE:
+		case SEC_ERROR_EXPIRED_CERTIFICATE:
+		case SEC_ERROR_UNKNOWN_ISSUER:
+		case SEC_ERROR_UNTRUSTED_ISSUER:
+		case SEC_ERROR_UNTRUSTED_CERT:
+		case SEC_ERROR_CERT_VALID:
+		case SEC_ERROR_EXPIRED_ISSUER_CERTIFICATE:
+		case SEC_ERROR_CRL_EXPIRED:
+		case SEC_ERROR_CRL_BAD_SIGNATURE:
+		case SEC_ERROR_EXTENSION_VALUE_INVALID:
+		case SEC_ERROR_CA_CERT_INVALID:
+		case SEC_ERROR_CERT_USAGES_INVALID:
+		case SEC_ERROR_UNKNOWN_CRITICAL_EXTENSION:
+			return SECSuccess;
+			break;
+		default:
+			return SECFailure;
+			break;
+	}
+
+	/* Unreachable */
+	return SECSuccess;
+}
+
+/* ------------------------------------------------------------ */
+/*					SSL information functions					*/
+/* ------------------------------------------------------------ */
+
+/*
+ * PQgetssl
+ *
+ * Return NULL as this is legacy and defined to always be equal to calling
+ * PQsslStruct(conn, "OpenSSL"); This should ideally trigger a logged warning
+ * somewhere as it's nonsensical to run in a non-OpenSSL build, but the color
+ * of said bikeshed hasn't yet been determined.
+ */
+void *
+PQgetssl(PGconn *conn)
+{
+	return NULL;
+}
+
+void *
+PQsslStruct(PGconn *conn, const char *struct_name)
+{
+	if (!conn)
+		return NULL;
+
+	/*
+	 * Return the underlying PRFileDesc which can be used to access
+	 * information on the connection details. There is no SSL context per se.
+	 */
+	if (strcmp(struct_name, "NSS") == 0)
+		return conn->pr_fd;
+	return NULL;
+}
+
+const char *const *
+PQsslAttributeNames(PGconn *conn)
+{
+	static const char *const result[] = {
+		"library",
+		"cipher",
+		"protocol",
+		"key_bits",
+		"compression",
+		NULL
+	};
+
+	return result;
+}
+
+const char *
+PQsslAttribute(PGconn *conn, const char *attribute_name)
+{
+	SECStatus	status;
+	SSLChannelInfo channel;
+	SSLCipherSuiteInfo suite;
+
+	if (!conn || !conn->pr_fd)
+		return NULL;
+
+	if (strcmp(attribute_name, "library") == 0)
+		return "NSS";
+
+	status = SSL_GetChannelInfo(conn->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+		return NULL;
+
+	status = SSL_GetCipherSuiteInfo(channel.cipherSuite, &suite, sizeof(suite));
+	if (status != SECSuccess)
+		return NULL;
+
+	if (strcmp(attribute_name, "cipher") == 0)
+		return suite.cipherSuiteName;
+
+	if (strcmp(attribute_name, "key_bits") == 0)
+	{
+		static char key_bits_str[8];
+
+		snprintf(key_bits_str, sizeof(key_bits_str), "%i", suite.effectiveKeyBits);
+		return key_bits_str;
+	}
+
+	if (strcmp(attribute_name, "protocol") == 0)
+	{
+		switch (channel.protocolVersion)
+		{
+#ifdef SSL_LIBRARY_VERSION_TLS_1_3
+			case SSL_LIBRARY_VERSION_TLS_1_3:
+				return "TLSv1.3";
+#endif
+#ifdef SSL_LIBRARY_VERSION_TLS_1_2
+			case SSL_LIBRARY_VERSION_TLS_1_2:
+				return "TLSv1.2";
+#endif
+#ifdef SSL_LIBRARY_VERSION_TLS_1_1
+			case SSL_LIBRARY_VERSION_TLS_1_1:
+				return "TLSv1.1";
+#endif
+			case SSL_LIBRARY_VERSION_TLS_1_0:
+				return "TLSv1.0";
+			default:
+				return "unknown";
+		}
+	}
+
+	/*
+	 * NSS disabled support for compression in version 3.33, and it was only
+	 * available for SSLv3 at that point anyways, so we can safely return off
+	 * here without checking.
+	 */
+	if (strcmp(attribute_name, "compression") == 0)
+		return "off";
+
+	return NULL;
+}
+
+static int
+ssl_protocol_version_to_nss(const char *protocol)
+{
+	if (pg_strcasecmp("TLSv1", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_0;
+
+#ifdef SSL_LIBRARY_VERSION_TLS_1_1
+	if (pg_strcasecmp("TLSv1.1", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_1;
+#endif
+
+#ifdef SSL_LIBRARY_VERSION_TLS_1_2
+	if (pg_strcasecmp("TLSv1.2", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_2;
+#endif
+
+#ifdef SSL_LIBRARY_VERSION_TLS_1_3
+	if (pg_strcasecmp("TLSv1.3", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_3;
+#endif
+
+	return -1;
+}
+
+/*
+ * cert_database_has_CA
+ *
+ * Returns true in case there is a CA certificate in the database connected
+ * to in the conn object, else false. This function only checks for the
+ * presence of a CA certificate, not it's validity and/or usefulness.
+ */
+static bool
+cert_database_has_CA(PGconn *conn)
+{
+	CERTCertList *certificates;
+	bool		hasCA;
+
+	/*
+	 * If the certificate database has a password we must provide it, since
+	 * this API doesn't invoke the standard password callback.
+	 */
+	if (conn->has_password)
+		certificates = PK11_ListCerts(PK11CertListCA, PQssl_passwd_cb(NULL, PR_FALSE, (void *) conn));
+	else
+		certificates = PK11_ListCerts(PK11CertListCA, NULL);
+	hasCA = !CERT_LIST_EMPTY(certificates);
+	CERT_DestroyCertList(certificates);
+
+	return hasCA;
+}
+
+PQsslKeyPassHook_nss_type
+PQgetSSLKeyPassHook_nss(void)
+{
+	return PQsslKeyPassHook;
+}
+
+void
+PQsetSSLKeyPassHook_nss(PQsslKeyPassHook_nss_type hook)
+{
+	PQsslKeyPassHook = hook;
+}
+
+/*
+ * Supply a password to decrypt a client certificate.
+ *
+ * This must match NSS type PK11PasswordFunc.
+ */
+static char *
+PQssl_passwd_cb(PK11SlotInfo *slot, PRBool retry, void *arg)
+{
+	PGconn	   *conn = (PGconn *) arg;
+
+	conn->has_password = true;
+
+	if (PQsslKeyPassHook)
+		return PQsslKeyPassHook(slot, (PRBool) retry, arg);
+	else
+		return PQdefaultSSLKeyPassHook_nss(slot, retry, arg);
+}
+
+/*
+ * The default password handler callback.
+ */
+char *
+PQdefaultSSLKeyPassHook_nss(PK11SlotInfo * slot, PRBool retry, void *arg)
+{
+	PGconn	   *conn = (PGconn *) arg;
+
+	/*
+	 * If the password didn't work the first time there is no point in
+	 * retrying as it hasn't changed.
+	 */
+	if (retry != PR_TRUE && conn->sslpassword && strlen(conn->sslpassword) > 0)
+		return PORT_Strdup(conn->sslpassword);
+
+	return NULL;
+}
diff --git a/src/interfaces/libpq/fe-secure.c b/src/interfaces/libpq/fe-secure.c
index 00b87bdc96..44385ee391 100644
--- a/src/interfaces/libpq/fe-secure.c
+++ b/src/interfaces/libpq/fe-secure.c
@@ -421,6 +421,9 @@ PQsslAttributeNames(PGconn *conn)
 
 	return result;
 }
+#endif							/* USE_SSL */
+
+#ifndef USE_OPENSSL
 
 PQsslKeyPassHook_OpenSSL_type
 PQgetSSLKeyPassHook_OpenSSL(void)
@@ -439,7 +442,7 @@ PQdefaultSSLKeyPassHook_OpenSSL(char *buf, int size, PGconn *conn)
 {
 	return 0;
 }
-#endif							/* USE_SSL */
+#endif							/* USE_OPENSSL */
 
 /* Dummy version of GSSAPI information functions, when built without GSS support */
 #ifndef ENABLE_GSS
diff --git a/src/interfaces/libpq/libpq-fe.h b/src/interfaces/libpq/libpq-fe.h
index c266ad5b13..aba32e6635 100644
--- a/src/interfaces/libpq/libpq-fe.h
+++ b/src/interfaces/libpq/libpq-fe.h
@@ -619,12 +619,23 @@ extern int	pg_valid_server_encoding_id(int encoding);
 
 /* === in fe-secure-openssl.c === */
 
-/* Support for overriding sslpassword handling with a callback. */
+/* Support for overriding sslpassword handling with a callback */
 typedef int (*PQsslKeyPassHook_OpenSSL_type) (char *buf, int size, PGconn *conn);
 extern PQsslKeyPassHook_OpenSSL_type PQgetSSLKeyPassHook_OpenSSL(void);
 extern void PQsetSSLKeyPassHook_OpenSSL(PQsslKeyPassHook_OpenSSL_type hook);
 extern int	PQdefaultSSLKeyPassHook_OpenSSL(char *buf, int size, PGconn *conn);
 
+/* == in fe-secure-nss.c === */
+typedef struct PK11SlotInfoStr PK11SlotInfo;
+typedef int PRIntn;
+typedef PRIntn PRBool;
+
+/* Support for overriding sslpassword handling with a callback */
+typedef char *(*PQsslKeyPassHook_nss_type) (PK11SlotInfo *slot, PRBool retry, void *arg);
+extern PQsslKeyPassHook_nss_type PQgetSSLKeyPassHook_nss(void);
+extern void PQsetSSLKeyPassHook_nss(PQsslKeyPassHook_nss_type hook);
+extern char *PQdefaultSSLKeyPassHook_nss(PK11SlotInfo *slot, PRBool retry, void *arg);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/src/interfaces/libpq/libpq-int.h b/src/interfaces/libpq/libpq-int.h
index 4db498369c..a95450fbba 100644
--- a/src/interfaces/libpq/libpq-int.h
+++ b/src/interfaces/libpq/libpq-int.h
@@ -362,6 +362,7 @@ struct pg_conn
 	char	   *sslpassword;	/* client key file password */
 	char	   *sslrootcert;	/* root certificate filename */
 	char	   *sslcrl;			/* certificate revocation list filename */
+	char	   *cert_database;	/* NSS certificate/key database */
 	char	   *requirepeer;	/* required peer credentials for local sockets */
 	char	   *gssencmode;		/* GSS mode (require,prefer,disable) */
 	char	   *krbsrvname;		/* Kerberos service name */
@@ -485,6 +486,23 @@ struct pg_conn
 								 * OpenSSL version changes */
 #endif
 #endif							/* USE_OPENSSL */
+
+#ifdef USE_NSS
+	void	   *pr_fd;			/* NSPR file descriptor for the connection */
+
+	/*
+	 * Track whether the NSS database has a password set or not. There is no
+	 * API function for retrieving password status of a database, but we need
+	 * to know since some NSS API calls require the password passed in (they
+	 * don't call the callback themselves). To track, we simply flip this to
+	 * true in case NSS invoked the password callback - as that will only
+	 * happen in case there is a password. The reason for tracking this is
+	 * that there are calls which require a password parameter, but doesn't
+	 * use the callbacks provided, so we must call the callback on behalf of
+	 * these.
+	 */
+	bool		has_password;
+#endif							/* USE_NSS */
 #endif							/* USE_SSL */
 
 #ifdef ENABLE_GSS
@@ -759,7 +777,7 @@ extern ssize_t pgtls_write(PGconn *conn, const void *ptr, size_t len);
  * This is not supported with old versions of OpenSSL that don't have
  * the X509_get_signature_nid() function.
  */
-#if defined(USE_OPENSSL) && defined(HAVE_X509_GET_SIGNATURE_NID)
+#if defined(USE_NSS) || (defined(USE_OPENSSL) && defined(HAVE_X509_GET_SIGNATURE_NID))
 #define HAVE_PGTLS_GET_PEER_CERTIFICATE_HASH
 extern char *pgtls_get_peer_certificate_hash(PGconn *conn, size_t *len);
 #endif
diff --git a/src/tools/msvc/Mkvcbuild.pm b/src/tools/msvc/Mkvcbuild.pm
index 90328db04e..ff01acf3f6 100644
--- a/src/tools/msvc/Mkvcbuild.pm
+++ b/src/tools/msvc/Mkvcbuild.pm
@@ -195,12 +195,19 @@ sub mkvcbuild
 	$postgres->FullExportDLL('postgres.lib');
 
 	# The OBJS scraper doesn't know about ifdefs, so remove appropriate files
-	# if building without OpenSSL.
-	if (!$solution->{options}->{openssl})
+	# if building without various options.
+	if (!$solution->{options}->{openssl} && !$solution->{options}->{nss})
 	{
 		$postgres->RemoveFile('src/backend/libpq/be-secure-common.c');
+	}
+	if (!$solution->{options}->{openssl})
+	{
 		$postgres->RemoveFile('src/backend/libpq/be-secure-openssl.c');
 	}
+	if (!$solution->{options}->{nss})
+	{
+		$postgres->RemoveFile('src/backend/libpq/be-secure-nss.c');
+	}
 	if (!$solution->{options}->{gss})
 	{
 		$postgres->RemoveFile('src/backend/libpq/be-gssapi-common.c');
@@ -258,12 +265,19 @@ sub mkvcbuild
 	$libpq->AddReference($libpgcommon, $libpgport);
 
 	# The OBJS scraper doesn't know about ifdefs, so remove appropriate files
-	# if building without OpenSSL.
-	if (!$solution->{options}->{openssl})
+	# if building without various options
+	if (!$solution->{options}->{openssl} && !$solution->{options}->{nss})
 	{
 		$libpq->RemoveFile('src/interfaces/libpq/fe-secure-common.c');
+	}
+	if (!$solution->{options}->{openssl})
+	{
 		$libpq->RemoveFile('src/interfaces/libpq/fe-secure-openssl.c');
 	}
+	if (!$solution->{options}->{nss})
+	{
+		$libpq->RemoveFile('src/interfaces/libpq/fe-secure-nss.c');
+	}
 	if (!$solution->{options}->{gss})
 	{
 		$libpq->RemoveFile('src/interfaces/libpq/fe-gssapi-common.c');
diff --git a/src/tools/msvc/Solution.pm b/src/tools/msvc/Solution.pm
index 1c0c92fcd2..5148708969 100644
--- a/src/tools/msvc/Solution.pm
+++ b/src/tools/msvc/Solution.pm
@@ -488,6 +488,7 @@ sub GenerateFiles
 		USE_LLVM                   => undef,
 		USE_NAMED_POSIX_SEMAPHORES => undef,
 		USE_OPENSSL                => undef,
+		USE_NSS                    => undef,
 		USE_PAM                    => undef,
 		USE_SLICING_BY_8_CRC32C    => undef,
 		USE_SSE42_CRC32C           => undef,
@@ -540,6 +541,10 @@ sub GenerateFiles
 			$define{HAVE_OPENSSL_INIT_SSL}      = 1;
 		}
 	}
+	if ($self->{options}->{nss})
+	{
+		$define{USE_NSS} = 1;
+	}
 
 	$self->GenerateConfigHeader('src/include/pg_config.h',     \%define, 1);
 	$self->GenerateConfigHeader('src/include/pg_config_ext.h', \%define, 0);
@@ -1005,6 +1010,21 @@ sub AddProject
 			}
 		}
 	}
+	if ($self->{options}->{nss})
+	{
+		$proj->AddIncludeDir($self->{options}->{nss} . '\..\public\nss');
+		$proj->AddIncludeDir($self->{options}->{nss} . '\include\nspr');
+		foreach my $lib (qw(plds4 plc4 nspr4))
+		{
+			$proj->AddLibrary($self->{options}->{nss} .
+							  '\lib\lib' . "$lib.lib", 0);
+		}
+		foreach my $lib (qw(ssl3 smime3 nss3))
+		{
+			$proj->AddLibrary($self->{options}->{nss} .
+							  '\lib' . "\\$lib.dll.lib", 0);
+		}
+	}
 	if ($self->{options}->{nls})
 	{
 		$proj->AddIncludeDir($self->{options}->{nls} . '\include');
-- 
2.21.1 (Apple Git-122.3)

commit 093bb937736cdfc871d8fd479748f93f18108ae0
Author: Jacob Champion <pchampion@vmware.com>
Date:   Fri Jan 29 09:32:27 2021 -0800

    test/ssl: fix final TODOs and SKIPs
    
    The server-cn-only database didn't have the root CA installed to be able
    to verify client certificates. Note that this changes the error message
    printed during the invalid-root tests, because the server is now sending
    the root of the chain (so the issuer is untrusted rather than
    unrecognized).

diff --git a/src/test/ssl/Makefile b/src/test/ssl/Makefile
index d275c89672..c8032a2c13 100644
--- a/src/test/ssl/Makefile
+++ b/src/test/ssl/Makefile
@@ -147,6 +147,7 @@ ssl/nss/server-cn-only.crt__server-cn-only.key.db: ssl/server-cn-only.crt ssl/se
 	certutil -d "sql:$@" -N --empty-password
 	certutil -d "sql:$@" -A -n ssl/server-cn-only.crt -i ssl/server-cn-only.crt -t "CT,C,C"
 	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
 	openssl pkcs12 -export -out ssl/nss/server-cn-only.pfx -inkey ssl/server-cn-only.key -in ssl/server-cn-only.crt -certfile ssl/server_ca.crt -passout pass:
 	pk12util -i ssl/nss/server-cn-only.pfx -d "sql:$@" -W ''
 
diff --git a/src/test/ssl/t/001_ssltests.pl b/src/test/ssl/t/001_ssltests.pl
index 6b8bca2846..5a83a1d277 100644
--- a/src/test/ssl/t/001_ssltests.pl
+++ b/src/test/ssl/t/001_ssltests.pl
@@ -159,12 +159,12 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"sslrootcert=invalid sslmode=verify-ca",
-	qr/root certificate file "invalid" does not exist|Peer's Certificate issuer is not recognized/,
+	qr/root certificate file "invalid" does not exist|Peer's certificate issuer has been marked as not trusted by the user/,
 	"connect without server root cert sslmode=verify-ca");
 test_connect_fails(
 	$common_connstr,
 	"sslrootcert=invalid sslmode=verify-full",
-	qr/root certificate file "invalid" does not exist|Peer's Certificate issuer is not recognized/,
+	qr/root certificate file "invalid" does not exist|Peer's certificate issuer has been marked as not trusted by the user/,
 	"connect without server root cert sslmode=verify-full");
 
 # Try with wrong root cert, should fail. (We're using the client CA as the
@@ -604,14 +604,10 @@ switch_server_cert($node, 'server-cn-only', 'root_ca');
 $common_connstr =
   "user=ssltestuser dbname=certdb sslkey=ssl/client_tmp.key sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client+client_ca.crt__client.key.db";
 
-TODO:
-{
-	local $TODO = "WIP failure cause currently unknown";
-	test_connect_ok(
-		$common_connstr,
-		"sslmode=require sslcert=ssl/client+client_ca.crt",
-		"intermediate client certificate is provided by client");
-}
+test_connect_ok(
+	$common_connstr,
+	"sslmode=require sslcert=ssl/client+client_ca.crt",
+	"intermediate client certificate is provided by client");
 
 test_connect_fails(
 	$common_connstr,
diff --git a/src/test/ssl/t/002_scram.pl b/src/test/ssl/t/002_scram.pl
index 4d7874d420..43565bdf6e 100644
--- a/src/test/ssl/t/002_scram.pl
+++ b/src/test/ssl/t/002_scram.pl
@@ -29,7 +29,8 @@ if ($ENV{with_ssl} eq 'openssl')
 elsif ($ENV{with_ssl} eq 'nss')
 {
 	$nss = 1;
-	plan tests => 8;
+	$supports_tls_server_end_point = 1;
+	plan tests => 9;
 }
 else
 {
@@ -79,24 +80,20 @@ test_connect_ok(
 	"user=ssltestuser channel_binding=disable",
 	"SCRAM with SSL and channel_binding=disable");
 
-SKIP:
+if ($supports_tls_server_end_point)
 {
-	skip "NSS support for TLS server endpoing is not implemented", 1 if ($nss);
-	if ($supports_tls_server_end_point)
-	{
-		test_connect_ok(
-			$common_connstr,
-			"user=ssltestuser channel_binding=require",
-			"SCRAM with SSL and channel_binding=require");
-	}
-	else
-	{
-		test_connect_fails(
-			$common_connstr,
-			"user=ssltestuser channel_binding=require",
-			qr/channel binding is required, but server did not offer an authentication method that supports channel binding/,
-			"SCRAM with SSL and channel_binding=require");
-	}
+	test_connect_ok(
+		$common_connstr,
+		"user=ssltestuser channel_binding=require",
+		"SCRAM with SSL and channel_binding=require");
+}
+else
+{
+	test_connect_fails(
+		$common_connstr,
+		"user=ssltestuser channel_binding=require",
+		qr/channel binding is required, but server did not offer an authentication method that supports channel binding/,
+		"SCRAM with SSL and channel_binding=require");
 }
 
 # Now test when the user has an MD5-encrypted password; should fail
@@ -106,21 +103,17 @@ test_connect_fails(
 	qr/channel binding required but not supported by server's authentication request/,
 	"MD5 with SSL and channel_binding=require");
 
-SKIP:
-{
-	skip "NSS support not implemented yet", 1 if ($nss);
-	# Now test with auth method 'cert' by connecting to 'certdb'. Should fail,
-	# because channel binding is not performed.  Note that ssl/client.key may
-	# be used in a different test, so the name of this temporary client key
-	# is chosen here to be unique.
-	my $client_tmp_key = "ssl/client_scram_tmp.key";
-	copy("ssl/client.key", $client_tmp_key);
-	chmod 0600, $client_tmp_key;
-	test_connect_fails(
-		"sslcert=ssl/client.crt sslkey=$client_tmp_key sslrootcert=invalid hostaddr=$SERVERHOSTADDR",
-		"dbname=certdb user=ssltestuser channel_binding=require",
-		qr/channel binding required, but server authenticated client without channel binding/,
-		"Cert authentication and channel_binding=require");
-	# clean up
-	unlink($client_tmp_key);
-}
+# Now test with auth method 'cert' by connecting to 'certdb'. Should fail,
+# because channel binding is not performed.  Note that ssl/client.key may
+# be used in a different test, so the name of this temporary client key
+# is chosen here to be unique.
+my $client_tmp_key = "ssl/client_scram_tmp.key";
+copy("ssl/client.key", $client_tmp_key);
+chmod 0600, $client_tmp_key;
+test_connect_fails(
+	"sslcert=ssl/client.crt sslkey=$client_tmp_key sslrootcert=invalid hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client.crt__client.key.db",
+	"dbname=certdb user=ssltestuser channel_binding=require",
+	qr/channel binding required, but server authenticated client without channel binding/,
+	"Cert authentication and channel_binding=require");
+# clean up
+unlink($client_tmp_key);

From 0c00c0ba3a4197eddb7943c1098732384912d6cd Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Wed, 28 Oct 2020 11:18:42 +0100
Subject: [PATCH v25 1/6] NSS Frontend, Backend and build infrastructure

TODO:
	* SCRAM channel binding is implemented but doesn't work
	* Frontend CRL configuration handling
	* Settle on a required version in autoconf
	* Move pg_nss.h to a .c file for both frontend and backend

Daniel Gustafsson, Andrew Dunstan, Jacob Champion
---
 configure                                     |  294 +++-
 configure.ac                                  |   31 +-
 .../postgres_fdw/expected/postgres_fdw.out    |    2 +-
 src/backend/libpq/Makefile                    |    4 +
 src/backend/libpq/auth.c                      |    7 +
 src/backend/libpq/be-secure-nss.c             | 1402 +++++++++++++++++
 src/backend/libpq/be-secure.c                 |    3 +
 src/backend/libpq/hba.c                       |    2 +-
 src/backend/utils/misc/guc.c                  |   20 +-
 src/common/Makefile                           |    5 +
 src/include/common/pg_nss.h                   |  175 ++
 src/include/libpq/libpq-be.h                  |   15 +-
 src/include/libpq/libpq.h                     |    3 +
 src/include/pg_config.h.in                    |    3 +
 src/include/pg_config_manual.h                |    5 +-
 src/interfaces/libpq/Makefile                 |    5 +
 src/interfaces/libpq/fe-connect.c             |    4 +
 src/interfaces/libpq/fe-secure-nss.c          | 1112 +++++++++++++
 src/interfaces/libpq/fe-secure.c              |    5 +-
 src/interfaces/libpq/libpq-fe.h               |   13 +-
 src/interfaces/libpq/libpq-int.h              |   20 +-
 src/tools/msvc/Mkvcbuild.pm                   |   22 +-
 src/tools/msvc/Solution.pm                    |   20 +
 23 files changed, 3150 insertions(+), 22 deletions(-)
 create mode 100644 src/backend/libpq/be-secure-nss.c
 create mode 100644 src/include/common/pg_nss.h
 create mode 100644 src/interfaces/libpq/fe-secure-nss.c

diff --git a/configure b/configure
index ce9ea36999..143726c79c 100755
--- a/configure
+++ b/configure
@@ -654,6 +654,8 @@ UUID_LIBS
 LDAP_LIBS_BE
 LDAP_LIBS_FE
 with_ssl
+NSPR_CONFIG
+NSS_CONFIG
 PTHREAD_CFLAGS
 PTHREAD_LIBS
 PTHREAD_CC
@@ -1570,7 +1572,7 @@ Optional Packages:
                           use system time zone data in DIR
   --without-zlib          do not use Zlib
   --with-gnu-ld           assume the C compiler uses GNU ld [default=no]
-  --with-ssl=LIB          use LIB for SSL/TLS support (openssl)
+  --with-ssl=LIB          use LIB for SSL/TLS support (openssl, nss)
   --with-openssl          obsolete spelling of --with-ssl=openssl
 
 Some influential environment variables:
@@ -12462,8 +12464,274 @@ done
 
 $as_echo "#define USE_OPENSSL 1" >>confdefs.h
 
+elif test "$with_ssl" = nss ; then
+  # TODO: fallback in case nss-config/nspr-config aren't found.
+  if test -z "$NSS_CONFIG"; then
+  for ac_prog in nss-config
+do
+  # Extract the first word of "$ac_prog", so it can be a program name with args.
+set dummy $ac_prog; ac_word=$2
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
+$as_echo_n "checking for $ac_word... " >&6; }
+if ${ac_cv_path_NSS_CONFIG+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  case $NSS_CONFIG in
+  [\\/]* | ?:[\\/]*)
+  ac_cv_path_NSS_CONFIG="$NSS_CONFIG" # Let the user override the test with a path.
+  ;;
+  *)
+  as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH
+do
+  IFS=$as_save_IFS
+  test -z "$as_dir" && as_dir=.
+    for ac_exec_ext in '' $ac_executable_extensions; do
+  if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
+    ac_cv_path_NSS_CONFIG="$as_dir/$ac_word$ac_exec_ext"
+    $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
+    break 2
+  fi
+done
+  done
+IFS=$as_save_IFS
+
+  ;;
+esac
+fi
+NSS_CONFIG=$ac_cv_path_NSS_CONFIG
+if test -n "$NSS_CONFIG"; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $NSS_CONFIG" >&5
+$as_echo "$NSS_CONFIG" >&6; }
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+fi
+
+
+  test -n "$NSS_CONFIG" && break
+done
+
+else
+  # Report the value of NSS_CONFIG in configure's output in all cases.
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for NSS_CONFIG" >&5
+$as_echo_n "checking for NSS_CONFIG... " >&6; }
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $NSS_CONFIG" >&5
+$as_echo "$NSS_CONFIG" >&6; }
+fi
+
+  if test -z "$NSPR_CONFIG"; then
+  for ac_prog in nspr-config
+do
+  # Extract the first word of "$ac_prog", so it can be a program name with args.
+set dummy $ac_prog; ac_word=$2
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
+$as_echo_n "checking for $ac_word... " >&6; }
+if ${ac_cv_path_NSPR_CONFIG+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  case $NSPR_CONFIG in
+  [\\/]* | ?:[\\/]*)
+  ac_cv_path_NSPR_CONFIG="$NSPR_CONFIG" # Let the user override the test with a path.
+  ;;
+  *)
+  as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH
+do
+  IFS=$as_save_IFS
+  test -z "$as_dir" && as_dir=.
+    for ac_exec_ext in '' $ac_executable_extensions; do
+  if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
+    ac_cv_path_NSPR_CONFIG="$as_dir/$ac_word$ac_exec_ext"
+    $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
+    break 2
+  fi
+done
+  done
+IFS=$as_save_IFS
+
+  ;;
+esac
+fi
+NSPR_CONFIG=$ac_cv_path_NSPR_CONFIG
+if test -n "$NSPR_CONFIG"; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $NSPR_CONFIG" >&5
+$as_echo "$NSPR_CONFIG" >&6; }
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+fi
+
+
+  test -n "$NSPR_CONFIG" && break
+done
+
+else
+  # Report the value of NSPR_CONFIG in configure's output in all cases.
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for NSPR_CONFIG" >&5
+$as_echo_n "checking for NSPR_CONFIG... " >&6; }
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $NSPR_CONFIG" >&5
+$as_echo "$NSPR_CONFIG" >&6; }
+fi
+
+  if test -n "$NSS_CONFIG"; then
+    NSS_LIBS=`$NSS_CONFIG --libs`
+	NSS_CFLAGS=`$NSS_CONFIG --cflags`
+  fi
+  if test -n "$NSPR_CONFIG"; then
+	NSPR_LIBS=`$NSPR_CONFIG --libs`
+	NSPR_CFLAGS=`$NSPR_CONFIG --cflags`
+  fi
+
+  LDFLAGS="$LDFLAGS $NSS_LIBS $NSPR_LIBS"
+  CFLAGS="$CFLAGS $NSS_CFLAGS $NSPR_CFLAGS"
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for NSS_InitContext in -lnss3" >&5
+$as_echo_n "checking for NSS_InitContext in -lnss3... " >&6; }
+if ${ac_cv_lib_nss3_NSS_InitContext+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lnss3  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char NSS_InitContext ();
+int
+main ()
+{
+return NSS_InitContext ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_lib_nss3_NSS_InitContext=yes
+else
+  ac_cv_lib_nss3_NSS_InitContext=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_nss3_NSS_InitContext" >&5
+$as_echo "$ac_cv_lib_nss3_NSS_InitContext" >&6; }
+if test "x$ac_cv_lib_nss3_NSS_InitContext" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_LIBNSS3 1
+_ACEOF
+
+  LIBS="-lnss3 $LIBS"
+
+else
+  as_fn_error $? "library 'nss3' is required for NSS" "$LINENO" 5
+fi
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for PR_GetDefaultIOMethods in -lnspr4" >&5
+$as_echo_n "checking for PR_GetDefaultIOMethods in -lnspr4... " >&6; }
+if ${ac_cv_lib_nspr4_PR_GetDefaultIOMethods+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lnspr4  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char PR_GetDefaultIOMethods ();
+int
+main ()
+{
+return PR_GetDefaultIOMethods ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_lib_nspr4_PR_GetDefaultIOMethods=yes
+else
+  ac_cv_lib_nspr4_PR_GetDefaultIOMethods=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_nspr4_PR_GetDefaultIOMethods" >&5
+$as_echo "$ac_cv_lib_nspr4_PR_GetDefaultIOMethods" >&6; }
+if test "x$ac_cv_lib_nspr4_PR_GetDefaultIOMethods" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_LIBNSPR4 1
+_ACEOF
+
+  LIBS="-lnspr4 $LIBS"
+
+else
+  as_fn_error $? "library 'nspr4' is required for NSS" "$LINENO" 5
+fi
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for SSL_GetImplementedCiphers in -lssl3" >&5
+$as_echo_n "checking for SSL_GetImplementedCiphers in -lssl3... " >&6; }
+if ${ac_cv_lib_ssl3_SSL_GetImplementedCiphers+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lssl3  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char SSL_GetImplementedCiphers ();
+int
+main ()
+{
+return SSL_GetImplementedCiphers ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_lib_ssl3_SSL_GetImplementedCiphers=yes
+else
+  ac_cv_lib_ssl3_SSL_GetImplementedCiphers=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_ssl3_SSL_GetImplementedCiphers" >&5
+$as_echo "$ac_cv_lib_ssl3_SSL_GetImplementedCiphers" >&6; }
+if test "x$ac_cv_lib_ssl3_SSL_GetImplementedCiphers" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_LIBSSL3 1
+_ACEOF
+
+  LIBS="-lssl3 $LIBS"
+
+else
+  as_fn_error $? "library 'ssl3' is required for NSS" "$LINENO" 5
+fi
+
+
+$as_echo "#define USE_NSS 1" >>confdefs.h
+
 elif test "$with_ssl" != no ; then
-  as_fn_error $? "--with-ssl must specify openssl" "$LINENO" 5
+  as_fn_error $? "--with-ssl must specify one of openssl or nss" "$LINENO" 5
 fi
 
 
@@ -13369,6 +13637,23 @@ else
 fi
 
 
+elif test "$with_ssl" = nss ; then
+  ac_fn_c_check_header_mongrel "$LINENO" "nss/ssl.h" "ac_cv_header_nss_ssl_h" "$ac_includes_default"
+if test "x$ac_cv_header_nss_ssl_h" = xyes; then :
+
+else
+  as_fn_error $? "header file <nss/ssl.h> is required for NSS" "$LINENO" 5
+fi
+
+
+  ac_fn_c_check_header_mongrel "$LINENO" "nss/nss.h" "ac_cv_header_nss_nss_h" "$ac_includes_default"
+if test "x$ac_cv_header_nss_nss_h" = xyes; then :
+
+else
+  as_fn_error $? "header file <nss/nss.h> is required for NSS" "$LINENO" 5
+fi
+
+
 fi
 
 if test "$with_pam" = yes ; then
@@ -18131,6 +18416,9 @@ $as_echo_n "checking which random number source to use... " >&6; }
 if test x"$with_ssl" = x"openssl" ; then
   { $as_echo "$as_me:${as_lineno-$LINENO}: result: OpenSSL" >&5
 $as_echo "OpenSSL" >&6; }
+elif test x"$with_ssl" = x"nss" ; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: NSS" >&5
+$as_echo "NSS" >&6; }
 elif test x"$PORTNAME" = x"win32" ; then
   { $as_echo "$as_me:${as_lineno-$LINENO}: result: Windows native" >&5
 $as_echo "Windows native" >&6; }
@@ -18160,7 +18448,7 @@ fi
   if test x"$ac_cv_file__dev_urandom" = x"no" ; then
     as_fn_error $? "
 no source of strong random numbers was found
-PostgreSQL can use OpenSSL, native Windows API or /dev/urandom as a source of random numbers." "$LINENO" 5
+PostgreSQL can use OpenSSL, NSS, native Windows API or /dev/urandom as a source of random numbers." "$LINENO" 5
   fi
 fi
 
diff --git a/configure.ac b/configure.ac
index 07da84d401..59657a6010 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1201,7 +1201,7 @@ fi
 #
 # There is currently only one supported SSL/TLS library: OpenSSL.
 #
-PGAC_ARG_REQ(with, ssl, [LIB], [use LIB for SSL/TLS support (openssl)])
+PGAC_ARG_REQ(with, ssl, [LIB], [use LIB for SSL/TLS support (openssl, nss)])
 if test x"$with_ssl" = x"" ; then
   with_ssl=no
 fi
@@ -1235,8 +1235,28 @@ if test "$with_ssl" = openssl ; then
   # function was removed.
   AC_CHECK_FUNCS([CRYPTO_lock])
   AC_DEFINE([USE_OPENSSL], 1, [Define to 1 if you have OpenSSL support.])
+elif test "$with_ssl" = nss ; then
+  # TODO: fallback in case nss-config/nspr-config aren't found.
+  PGAC_PATH_PROGS(NSS_CONFIG, nss-config)
+  PGAC_PATH_PROGS(NSPR_CONFIG, nspr-config)
+  if test -n "$NSS_CONFIG"; then
+    NSS_LIBS=`$NSS_CONFIG --libs`
+	NSS_CFLAGS=`$NSS_CONFIG --cflags`
+  fi
+  if test -n "$NSPR_CONFIG"; then
+	NSPR_LIBS=`$NSPR_CONFIG --libs`
+	NSPR_CFLAGS=`$NSPR_CONFIG --cflags`
+  fi
+
+  LDFLAGS="$LDFLAGS $NSS_LIBS $NSPR_LIBS"
+  CFLAGS="$CFLAGS $NSS_CFLAGS $NSPR_CFLAGS"
+
+  AC_CHECK_LIB(nss3, NSS_InitContext, [], [AC_MSG_ERROR([library 'nss3' is required for NSS])])
+  AC_CHECK_LIB(nspr4, PR_GetDefaultIOMethods, [], [AC_MSG_ERROR([library 'nspr4' is required for NSS])])
+  AC_CHECK_LIB(ssl3, SSL_GetImplementedCiphers, [], [AC_MSG_ERROR([library 'ssl3' is required for NSS])])
+  AC_DEFINE([USE_NSS], 1, [Define to 1 if you have NSS support,])
 elif test "$with_ssl" != no ; then
-  AC_MSG_ERROR([--with-ssl must specify openssl])
+  AC_MSG_ERROR([--with-ssl must specify one of openssl or nss])
 fi
 AC_SUBST(with_ssl)
 
@@ -1414,6 +1434,9 @@ fi
 if test "$with_ssl" = openssl ; then
   AC_CHECK_HEADER(openssl/ssl.h, [], [AC_MSG_ERROR([header file <openssl/ssl.h> is required for OpenSSL])])
   AC_CHECK_HEADER(openssl/err.h, [], [AC_MSG_ERROR([header file <openssl/err.h> is required for OpenSSL])])
+elif test "$with_ssl" = nss ; then
+  AC_CHECK_HEADER(nss/ssl.h, [], [AC_MSG_ERROR([header file <nss/ssl.h> is required for NSS])])
+  AC_CHECK_HEADER(nss/nss.h, [], [AC_MSG_ERROR([header file <nss/nss.h> is required for NSS])])
 fi
 
 if test "$with_pam" = yes ; then
@@ -2170,6 +2193,8 @@ fi
 AC_MSG_CHECKING([which random number source to use])
 if test x"$with_ssl" = x"openssl" ; then
   AC_MSG_RESULT([OpenSSL])
+elif test x"$with_ssl" = x"nss" ; then
+  AC_MSG_RESULT([NSS])
 elif test x"$PORTNAME" = x"win32" ; then
   AC_MSG_RESULT([Windows native])
 else
@@ -2179,7 +2204,7 @@ else
   if test x"$ac_cv_file__dev_urandom" = x"no" ; then
     AC_MSG_ERROR([
 no source of strong random numbers was found
-PostgreSQL can use OpenSSL, native Windows API or /dev/urandom as a source of random numbers.])
+PostgreSQL can use OpenSSL, NSS, native Windows API or /dev/urandom as a source of random numbers.])
   fi
 fi
 
diff --git a/contrib/postgres_fdw/expected/postgres_fdw.out b/contrib/postgres_fdw/expected/postgres_fdw.out
index b09dce63f5..fbbe778217 100644
--- a/contrib/postgres_fdw/expected/postgres_fdw.out
+++ b/contrib/postgres_fdw/expected/postgres_fdw.out
@@ -8928,7 +8928,7 @@ DO $d$
     END;
 $d$;
 ERROR:  invalid option "password"
-HINT:  Valid options in this context are: service, passfile, channel_binding, connect_timeout, dbname, host, hostaddr, port, options, application_name, keepalives, keepalives_idle, keepalives_interval, keepalives_count, tcp_user_timeout, sslmode, sslcompression, sslcert, sslkey, sslrootcert, sslcrl, requirepeer, ssl_min_protocol_version, ssl_max_protocol_version, gssencmode, krbsrvname, gsslib, target_session_attrs, use_remote_estimate, fdw_startup_cost, fdw_tuple_cost, extensions, updatable, fetch_size, batch_size
+HINT:  Valid options in this context are: service, passfile, channel_binding, connect_timeout, dbname, host, hostaddr, port, options, application_name, keepalives, keepalives_idle, keepalives_interval, keepalives_count, tcp_user_timeout, sslmode, sslcompression, sslcert, sslkey, sslrootcert, sslcrl, requirepeer, ssl_min_protocol_version, ssl_max_protocol_version, gssencmode, krbsrvname, gsslib, target_session_attrs, cert_database, use_remote_estimate, fdw_startup_cost, fdw_tuple_cost, extensions, updatable, fetch_size, batch_size
 CONTEXT:  SQL statement "ALTER SERVER loopback_nopw OPTIONS (ADD password 'dummypw')"
 PL/pgSQL function inline_code_block line 3 at EXECUTE
 -- If we add a password for our user mapping instead, we should get a different
diff --git a/src/backend/libpq/Makefile b/src/backend/libpq/Makefile
index 8d1d16b0fc..045d2c2f6b 100644
--- a/src/backend/libpq/Makefile
+++ b/src/backend/libpq/Makefile
@@ -30,6 +30,10 @@ OBJS = \
 
 ifeq ($(with_ssl),openssl)
 OBJS += be-secure-openssl.o
+else
+ifeq ($(with_ssl),nss)
+OBJS += be-secure-nss.o
+endif
 endif
 
 ifeq ($(with_gssapi),yes)
diff --git a/src/backend/libpq/auth.c b/src/backend/libpq/auth.c
index 545635f41a..09ad2ad063 100644
--- a/src/backend/libpq/auth.c
+++ b/src/backend/libpq/auth.c
@@ -2849,7 +2849,14 @@ CheckCertAuth(Port *port)
 {
 	int			status_check_usermap = STATUS_ERROR;
 
+#if defined(USE_OPENSSL)
 	Assert(port->ssl);
+#elif defined(USE_NSS)
+	/* TODO: should we rename pr_fd to ssl, to keep consistency? */
+	Assert(port->pr_fd);
+#else
+	Assert(false);
+#endif
 
 	/* Make sure we have received a username in the certificate */
 	if (port->peer_cn == NULL ||
diff --git a/src/backend/libpq/be-secure-nss.c b/src/backend/libpq/be-secure-nss.c
new file mode 100644
index 0000000000..876e54be51
--- /dev/null
+++ b/src/backend/libpq/be-secure-nss.c
@@ -0,0 +1,1402 @@
+/*-------------------------------------------------------------------------
+ *
+ * be-secure-nss.c
+ *	  functions for supporting NSS as a TLS backend
+ *
+ *
+ * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ *	  src/backend/libpq/be-secure-nss.c
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#include "postgres.h"
+
+#include <sys/stat.h>
+
+/*
+ * BITS_PER_BYTE is also defined in the NSPR header files, so we need to undef
+ * our version to avoid compiler warnings on redefinition.
+ */
+#define pg_BITS_PER_BYTE BITS_PER_BYTE
+#undef BITS_PER_BYTE
+
+/*
+ * The nspr/obsolete/protypes.h NSPR header typedefs uint64 and int64 with
+ * colliding definitions from ours, causing a much expected compiler error.
+ * Remove backwards compatibility with ancient NSPR versions to avoid this.
+ */
+#define NO_NSPR_10_SUPPORT
+#include <nspr/nspr.h>
+#include <nspr/prerror.h>
+#include <nspr/prio.h>
+#include <nspr/prmem.h>
+#include <nspr/prtypes.h>
+
+#include <nss/nss.h>
+#include <nss/base64.h>
+#include <nss/cert.h>
+#include <nss/certdb.h>
+#include <nss/hasht.h>
+#include <nss/keyhi.h>
+#include <nss/pk11pub.h>
+#include <nss/secder.h>
+#include <nss/secerr.h>
+#include <nss/secitem.h>
+#include <nss/secoidt.h>
+#include <nss/secport.h>
+#include <nss/ssl.h>
+#include <nss/sslerr.h>
+#include <nss/sslproto.h>
+
+/*
+ * Ensure that the colliding definitions match, else throw an error. In case
+ * NSPR has removed the definition for some reason, make sure to put ours
+ * back again.
+ */
+#if defined(BITS_PER_BYTE)
+#if BITS_PER_BYTE != pg_BITS_PER_BYTE
+#error "incompatible byte widths between NSPR and postgres"
+#endif
+#else
+#define BITS_PER_BYTE pg_BITS_PER_BYTE
+#endif
+#undef pg_BITS_PER_BYTE
+
+#include "common/pg_nss.h"
+#include "lib/stringinfo.h"
+#include "libpq/libpq.h"
+#include "nodes/pg_list.h"
+#include "miscadmin.h"
+#include "storage/fd.h"
+#include "utils/guc.h"
+#include "utils/memutils.h"
+
+
+/* default init hook can be overridden by a shared library */
+static void default_nss_tls_init(bool isServerStart);
+nss_tls_init_hook_type nss_tls_init_hook = default_nss_tls_init;
+
+static PRDescIdentity pr_id;
+
+static PRIOMethods pr_iomethods;
+static NSSInitContext *nss_context = NULL;
+static SSLVersionRange desired_sslver;
+
+static char *external_ssl_passphrase_cb(PK11SlotInfo *slot, PRBool retry, void *arg);
+static SECStatus pg_SSLShutdownFunc(void *private_data, void *nss_data);
+static bool dummy_ssl_passwd_cb_called = false;
+static bool ssl_is_server_start;
+
+/*
+ * PR_ImportTCPSocket() is a private API, but very widely used, as it's the
+ * only way to make NSS use an already set up POSIX file descriptor rather
+ * than opening one itself. To quote the NSS documentation:
+ *
+ *		"In theory, code that uses PR_ImportTCPSocket may break when NSPR's
+ *		implementation changes. In practice, this is unlikely to happen because
+ *		NSPR's implementation has been stable for years and because of NSPR's
+ *		strong commitment to backward compatibility."
+ *
+ * https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSPR/Reference/PR_ImportTCPSocket
+ *
+ * The function is declared in <private/pprio.h>, but as it is a header marked
+ * private we declare it here rather than including it.
+ */
+NSPR_API(PRFileDesc *) PR_ImportTCPSocket(int);
+
+/* NSS IO layer callback overrides */
+static PRInt32 pg_ssl_read(PRFileDesc *fd, void *buf, PRInt32 amount,
+						   PRIntn flags, PRIntervalTime timeout);
+static PRInt32 pg_ssl_write(PRFileDesc *fd, const void *buf, PRInt32 amount,
+							PRIntn flags, PRIntervalTime timeout);
+static PRStatus pg_ssl_close(PRFileDesc *fd);
+/* Utility functions */
+static PRFileDesc *init_iolayer(Port *port);
+static uint16 ssl_protocol_version_to_nss(int v, const char *guc_name);
+
+static char *pg_SSLerrmessage(PRErrorCode errcode);
+static char *ssl_protocol_version_to_string(int v);
+static SECStatus pg_cert_auth_handler(void *arg, PRFileDesc *fd,
+									  PRBool checksig, PRBool isServer);
+static SECStatus pg_bad_cert_handler(void *arg, PRFileDesc *fd);
+static char *dummy_ssl_passphrase_cb(PK11SlotInfo *slot, PRBool retry, void *arg);
+
+/* ------------------------------------------------------------ */
+/*						 Public interface						*/
+/* ------------------------------------------------------------ */
+
+/*
+ * be_tls_init
+ *			Initialize the nss TLS library in the postmaster
+ *
+ * The majority of the setup needs to happen in be_tls_open_server since the
+ * NSPR initialization must happen after the forking of the backend. We could
+ * potentially move some parts in under !isServerStart, but so far this is the
+ * separation chosen.
+ */
+int
+be_tls_init(bool isServerStart)
+{
+	SECStatus	status;
+	SSLVersionRange supported_sslver;
+
+	status = SSL_ConfigServerSessionIDCacheWithOpt(0, 0, NULL, 1, 0, 0, PR_FALSE);
+	if (status != SECSuccess)
+	{
+		ereport(isServerStart ? FATAL : LOG,
+				(errmsg("unable to connect to TLS connection cache: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+		return -1;
+	}
+
+	if (!ssl_database || strlen(ssl_database) == 0)
+	{
+		ereport(isServerStart ? FATAL : LOG,
+				(errmsg("no certificate database specified")));
+		return -1;
+	}
+
+	/*
+	 * We check for the desired TLS version range here, even though we cannot
+	 * set it until be_open_server such that we can be compatible with how the
+	 * OpenSSL backend reports errors for incompatible range configurations.
+	 * Set either the default supported TLS version range, or the configured
+	 * range from ssl_min_protocol_version and ssl_max_protocol version. In
+	 * case the user hasn't defined the maximum allowed version we fall back
+	 * to the highest version TLS that the library supports.
+	 */
+	if (SSL_VersionRangeGetSupported(ssl_variant_stream, &supported_sslver) != SECSuccess)
+	{
+		ereport(isServerStart ? FATAL : LOG,
+				(errmsg("unable to get default protocol support from NSS")));
+		return -1;
+	}
+
+	/*
+	 * Set the fallback versions for the TLS protocol version range to a
+	 * combination of our minimal requirement and the library maximum. Error
+	 * messages should be kept identical to those in be-secure-openssl.c to
+	 * make translations easier.
+	 */
+	desired_sslver.min = SSL_LIBRARY_VERSION_TLS_1_0;
+	desired_sslver.max = supported_sslver.max;
+
+	if (ssl_min_protocol_version)
+	{
+		int			ver = ssl_protocol_version_to_nss(ssl_min_protocol_version,
+													  "ssl_min_protocol_version");
+
+		if (ver == -1)
+		{
+			ereport(isServerStart ? FATAL : LOG,
+					(errmsg("\"%s\" setting \"%s\" not supported by this build",
+							"ssl_min_protocol_version",
+							GetConfigOption("ssl_min_protocol_version",
+											false, false))));
+			return -1;
+		}
+
+		if (ver > 0)
+			desired_sslver.min = ver;
+	}
+
+	if (ssl_max_protocol_version)
+	{
+		int			ver = ssl_protocol_version_to_nss(ssl_max_protocol_version,
+													  "ssl_max_protocol_version");
+
+		if (ver == -1)
+		{
+			ereport(isServerStart ? FATAL : LOG,
+					(errmsg("\"%s\" setting \"%s\" not supported by this build",
+							"ssl_max_protocol_version",
+							GetConfigOption("ssl_max_protocol_version",
+											false, false))));
+			return -1;
+		}
+		if (ver > 0)
+			desired_sslver.max = ver;
+
+		if (ver < desired_sslver.min)
+		{
+			ereport(isServerStart ? FATAL : LOG,
+					(errmsg("could not set SSL protocol version range"),
+					 errdetail("\"%s\" cannot be higher than \"%s\"",
+							   "ssl_min_protocol_version",
+							   "ssl_max_protocol_version")));
+			return -1;
+		}
+	}
+
+	/*
+	 * Set the passphrase callback which will be used both to obtain the
+	 * passphrase from the user, as well as by NSS to obtain the phrase
+	 * repeatedly.
+	 */
+	ssl_is_server_start = isServerStart;
+	(*nss_tls_init_hook) (isServerStart);
+
+	return 0;
+}
+
+int
+be_tls_open_server(Port *port)
+{
+	SECStatus	status;
+	PRFileDesc *model;
+	PRFileDesc *pr_fd;
+	PRFileDesc *layer;
+	CERTCertificate *server_cert;
+	SECKEYPrivateKey *private_key;
+	CERTSignedCrl *crl;
+	SECItem		crlname;
+	char	   *cert_database;
+	NSSInitParameters params;
+
+	/*
+	 * The NSPR documentation states that runtime initialization via PR_Init
+	 * is no longer required, as the first caller into NSPR will perform the
+	 * initialization implicitly. The documentation doesn't however clarify
+	 * from which version this is holds true, so let's perform the potentially
+	 * superfluous initialization anyways to avoid crashing on older versions
+	 * of NSPR, as there is no difference in overhead.  The NSS documentation
+	 * still states that PR_Init must be called in some way (implicitly or
+	 * explicitly).
+	 *
+	 * The below parameters are what the implicit initialization would've done
+	 * for us, and should work even for older versions where it might not be
+	 * done automatically. The last parameter, maxPTDs, is set to various
+	 * values in other codebases, but has been unused since NSPR 2.1 which was
+	 * released sometime in 1998. In current versions of NSPR all parameters
+	 * are ignored.
+	 */
+	PR_Init(PR_USER_THREAD, PR_PRIORITY_NORMAL, 0 /* maxPTDs */ );
+
+	/*
+	 * The certificate path (configdir) must contain a valid NSS database. If
+	 * the certificate path isn't a valid directory, NSS will fall back on the
+	 * system certificate database. If the certificate path is a directory but
+	 * is empty then the initialization will fail. On the client side this can
+	 * be allowed for any sslmode but the verify-xxx ones.
+	 * https://bugzilla.redhat.com/show_bug.cgi?id=728562 For the server side
+	 * we won't allow this to fail however, as we require the certificate and
+	 * key to exist.
+	 *
+	 * The original design of NSS was for a single application to use a single
+	 * copy of it, initialized with NSS_Initialize() which isn't returning any
+	 * handle with which to refer to NSS. NSS initialization and shutdown are
+	 * global for the application, so a shutdown in another NSS enabled
+	 * library would cause NSS to be stopped for libpq as well.  The fix has
+	 * been to introduce NSS_InitContext which returns a context handle to
+	 * pass to NSS_ShutdownContext.  NSS_InitContext was introduced in NSS
+	 * 3.12, but the use of it is not very well documented.
+	 * https://bugzilla.redhat.com/show_bug.cgi?id=738456
+	 *
+	 * The InitParameters struct passed can be used to override internal
+	 * values in NSS, but the usage is not documented at all. When using
+	 * NSS_Init initializations, the values are instead set via PK11_Configure
+	 * calls so the PK11_Configure documentation can be used to glean some
+	 * details on these.
+	 *
+	 * https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS/PKCS11/Module_Specs
+	 */
+	memset(&params, '\0', sizeof(params));
+	params.length = sizeof(params);
+
+	if (!ssl_database || strlen(ssl_database) == 0)
+		ereport(FATAL,
+				(errmsg("no certificate database specified")));
+
+	cert_database = psprintf("sql:%s", ssl_database);
+	nss_context = NSS_InitContext(cert_database, "", "", "",
+								  &params,
+								  NSS_INIT_READONLY | NSS_INIT_PK11RELOAD);
+	pfree(cert_database);
+
+	if (!nss_context)
+		ereport(FATAL,
+				(errmsg("unable to read certificate database \"%s\": %s",
+						ssl_database, pg_SSLerrmessage(PR_GetError()))));
+
+	/*
+	 * Import the already opened socket as we don't want to use NSPR functions
+	 * for opening the network socket due to how the PostgreSQL protocol works
+	 * with TLS connections. This function is not part of the NSPR public API,
+	 * see the comment at the top of the file for the rationale of still using
+	 * it.
+	 */
+	pr_fd = PR_ImportTCPSocket(port->sock);
+	if (!pr_fd)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to connect to socket")));
+		return -1;
+	}
+
+	/*
+	 * Most of the documentation available, and implementations of, NSS/NSPR
+	 * use the PR_NewTCPSocket() function here, which has the drawback that it
+	 * can only create IPv4 sockets. Instead use PR_OpenTCPSocket() which
+	 * copes with IPv6 as well.
+	 *
+	 * We use a model filedescriptor here which is a construct in NSPR/NSS in
+	 * order to create a configuration template for sockets which can then be
+	 * applied to new sockets created. This makes more sense in a server which
+	 * accepts multiple connections and want to perform the boilerplate just
+	 * once, but it does provide a nice abstraction here as well in that we
+	 * can error out early without having performed any operation on the real
+	 * socket.
+	 */
+	model = PR_OpenTCPSocket(port->laddr.addr.ss_family);
+	if (!model)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to open socket")));
+		return -1;
+	}
+
+	/*
+	 * Convert the NSPR socket to an SSL socket. Ensuring the success of this
+	 * operation is critical as NSS SSL_* functions may return SECSuccess on
+	 * the socket even though SSL hasn't been enabled, which introduce a risk
+	 * of silent downgrades.
+	 */
+	model = SSL_ImportFD(NULL, model);
+	if (!model)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to enable TLS on socket")));
+		return -1;
+	}
+
+	/*
+	 * Configure basic settings for the connection over the SSL socket in
+	 * order to set it up as a server.
+	 */
+	if (SSL_OptionSet(model, SSL_SECURITY, PR_TRUE) != SECSuccess)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to configure TLS connection")));
+		return -1;
+	}
+
+	if (SSL_OptionSet(model, SSL_HANDSHAKE_AS_SERVER, PR_TRUE) != SECSuccess ||
+		SSL_OptionSet(model, SSL_HANDSHAKE_AS_CLIENT, PR_FALSE) != SECSuccess)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to configure TLS connection as server")));
+		return -1;
+	}
+
+	/*
+	 * SSLv2 is disabled by default, and SSLv3 will be excluded from the range
+	 * of allowed protocols further down. Since we really don't want these to
+	 * ever be enabled, let's use belts and suspenders and explicitly turn
+	 * them off as well.
+	 */
+	SSL_OptionSet(model, SSL_ENABLE_SSL2, PR_FALSE);
+	SSL_OptionSet(model, SSL_ENABLE_SSL3, PR_FALSE);
+
+#ifdef SSL_CBC_RANDOM_IV
+
+	/*
+	 * Enable protection against the BEAST attack in case the NSS server has
+	 * support for that. While SSLv3 is disabled, we may still allow TLSv1
+	 * which is affected. The option isn't documented as an SSL option, but as
+	 * an NSS environment variable.
+	 */
+	SSL_OptionSet(model, SSL_CBC_RANDOM_IV, PR_TRUE);
+#endif
+
+	/*
+	 * Configure the allowed ciphers. If there are no user preferred suites,
+	 * set the domestic policy.
+	 *
+	 * Historically there were different cipher policies based on export (and
+	 * import) restrictions: Domestic, Export and France. These are since long
+	 * removed with all ciphers being enabled by default. Due to backwards
+	 * compatibility, the old API is still used even though all three policies
+	 * now do the same thing.
+	 *
+	 * If SSLCipherSuites define a policy of the user, we set that rather than
+	 * enabling all ciphers via NSS_SetDomesticPolicy.
+	 *
+	 * TODO: while this code works, the set of ciphers which can be set and
+	 * still end up with a working socket is woefully underdocumented for
+	 * anything more recent than SSLv3 (the code for TLS actually calls ssl3
+	 * functions under the hood for SSL_CipherPrefSet), so it's unclear if
+	 * this is helpful or not. Using the policies works, but may be too
+	 * coarsely grained.
+	 *
+	 * Another TODO: The SSL_ImplementedCiphers table returned with calling
+	 * SSL_GetImplementedCiphers is sorted in server preference order. Sorting
+	 * SSLCipherSuites according to the order of the ciphers therein could be
+	 * a way to implement ssl_prefer_server_ciphers - if we at all want to use
+	 * cipher selection for NSS like how we do it for OpenSSL that is.
+	 */
+
+	/*
+	 * If no ciphers are specified, enable them all.
+	 */
+	if (!SSLCipherSuites || strlen(SSLCipherSuites) == 0)
+	{
+		status = NSS_SetDomesticPolicy();
+		if (status != SECSuccess)
+		{
+			ereport(COMMERROR,
+					(errmsg("unable to set cipher policy: %s",
+							pg_SSLerrmessage(PR_GetError()))));
+			return -1;
+		}
+	}
+	else
+	{
+		char	   *ciphers,
+				   *c;
+
+		char	   *sep = ":;, ";
+		PRUint16	ciphercode;
+		const		PRUint16 *nss_ciphers;
+
+		/*
+		 * If the user has specified a set of preferred cipher suites we start
+		 * by turning off all the existing suites to avoid the risk of down-
+		 * grades to a weaker cipher than expected.
+		 */
+		nss_ciphers = SSL_GetImplementedCiphers();
+		for (int i = 0; i < SSL_GetNumImplementedCiphers(); i++)
+			SSL_CipherPrefSet(model, nss_ciphers[i], PR_FALSE);
+
+		ciphers = pstrdup(SSLCipherSuites);
+
+		for (c = strtok(ciphers, sep); c; c = strtok(NULL, sep))
+		{
+			ciphercode = pg_find_cipher(c);
+			if (ciphercode != INVALID_CIPHER)
+			{
+				status = SSL_CipherPrefSet(model, ciphercode, PR_TRUE);
+				if (status != SECSuccess)
+				{
+					ereport(COMMERROR,
+							(errmsg("invalid cipher-suite specified: %s", c)));
+					return -1;
+				}
+			}
+		}
+
+		pfree(ciphers);
+	}
+
+	if (SSL_VersionRangeSet(model, &desired_sslver) != SECSuccess)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to set requested SSL protocol version range")));
+		return -1;
+	}
+
+	/*
+	 * Set up the custom IO layer.
+	 */
+	layer = init_iolayer(port);
+	if (!layer)
+		return -1;
+
+	if (PR_PushIOLayer(pr_fd, PR_TOP_IO_LAYER, layer) != PR_SUCCESS)
+	{
+		PR_Close(layer);
+		ereport(COMMERROR,
+				(errmsg("unable to push IO layer")));
+		return -1;
+	}
+
+	server_cert = PK11_FindCertFromNickname(ssl_cert_file, (void *) port);
+	if (!server_cert)
+	{
+		if (dummy_ssl_passwd_cb_called)
+		{
+			ereport(COMMERROR,
+					(errmsg("unable to load certificate for \"%s\": %s",
+							ssl_cert_file, pg_SSLerrmessage(PR_GetError())),
+					 errhint("The certificate requires a password.")));
+			return -1;
+		}
+		else
+		{
+			ereport(COMMERROR,
+					(errmsg("unable to find certificate for \"%s\": %s",
+							ssl_cert_file, pg_SSLerrmessage(PR_GetError()))));
+			return -1;
+		}
+	}
+
+	private_key = PK11_FindKeyByAnyCert(server_cert, (void *) port);
+	if (!private_key)
+	{
+		if (dummy_ssl_passwd_cb_called)
+		{
+			ereport(COMMERROR,
+					(errmsg("unable to load private key for \"%s\": %s",
+							ssl_cert_file, pg_SSLerrmessage(PR_GetError())),
+					 errhint("The private key requires a password.")));
+			return -1;
+		}
+		else
+		{
+			ereport(COMMERROR,
+					(errmsg("unable to find private key for \"%s\": %s",
+							ssl_cert_file, pg_SSLerrmessage(PR_GetError()))));
+			return -1;
+		}
+	}
+
+	/*
+	 * NSS doesn't use CRL files on disk, so we use the ssl_crl_file guc to
+	 * contain the CRL nickname for the current server certificate in the NSS
+	 * certificate database. The main difference from the OpenSSL backend is
+	 * that NSS will use the CRL regardless, but being able to make sure the
+	 * CRL is loaded seems like a good feature.
+	 */
+	if (ssl_crl_file[0])
+	{
+		SECITEM_CopyItem(NULL, &crlname, &server_cert->derSubject);
+		crl = SEC_FindCrlByName(CERT_GetDefaultCertDB(), &crlname, SEC_CRL_TYPE);
+		if (!crl)
+		{
+			ereport(COMMERROR,
+					(errmsg("specified CRL not found in database")));
+			return -1;
+		}
+		SEC_DestroyCrl(crl);
+	}
+
+	/*
+	 * Finally we must configure the socket for being a server by setting the
+	 * certificate and key. The NULL parameter is an SSLExtraServerCertData
+	 * pointer with the final parameter being the size of the extra server
+	 * cert data structure pointed to. This is typically only used for
+	 * credential delegation.
+	 */
+	status = SSL_ConfigServerCert(model, server_cert, private_key, NULL, 0);
+	if (status != SECSuccess)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to configure server for TLS server connections: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+		return -1;
+	}
+
+	ssl_loaded_verify_locations = true;
+
+	/*
+	 * At this point, we no longer have use for the certificate and private
+	 * key as they have been copied into the context by NSS. Destroy our
+	 * copies explicitly to clean out the memory as best we can.
+	 */
+	CERT_DestroyCertificate(server_cert);
+	SECKEY_DestroyPrivateKey(private_key);
+
+	/* Set up certificate authentication callback */
+	status = SSL_AuthCertificateHook(model, pg_cert_auth_handler, (void *) port);
+	if (status != SECSuccess)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to install authcert hook: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+		return -1;
+	}
+	SSL_BadCertHook(model, pg_bad_cert_handler, (void *) port);
+	SSL_OptionSet(model, SSL_REQUEST_CERTIFICATE, PR_TRUE);
+	SSL_OptionSet(model, SSL_REQUIRE_CERTIFICATE, PR_FALSE);
+
+	port->pr_fd = SSL_ImportFD(model, pr_fd);
+	if (!port->pr_fd)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to initialize")));
+		return -1;
+	}
+
+	PR_Close(model);
+
+	/*
+	 * Force a handshake on the next I/O request, the second parameter means
+	 * that we are a server, PR_FALSE would indicate being a client. NSPR
+	 * requires us to call SSL_ResetHandshake since we imported an already
+	 * established socket.
+	 */
+	status = SSL_ResetHandshake(port->pr_fd, PR_TRUE);
+	if (status != SECSuccess)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to initiate handshake: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+		return -1;
+	}
+	status = SSL_ForceHandshake(port->pr_fd);
+	if (status != SECSuccess)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to handshake: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+		return -1;
+	}
+
+	port->ssl_in_use = true;
+
+	/* Register out shutdown callback */
+	NSS_RegisterShutdown(pg_SSLShutdownFunc, port);
+
+	return 0;
+}
+
+ssize_t
+be_tls_read(Port *port, void *ptr, size_t len, int *waitfor)
+{
+	ssize_t		n_read;
+	PRErrorCode err;
+
+	n_read = PR_Read(port->pr_fd, ptr, len);
+
+	if (n_read < 0)
+	{
+		err = PR_GetError();
+
+		if (err == PR_WOULD_BLOCK_ERROR)
+		{
+			*waitfor = WL_SOCKET_READABLE;
+			errno = EWOULDBLOCK;
+		}
+		else
+			errno = ECONNRESET;
+	}
+
+	return n_read;
+}
+
+ssize_t
+be_tls_write(Port *port, void *ptr, size_t len, int *waitfor)
+{
+	ssize_t		n_write;
+	PRErrorCode err;
+	PRIntn		flags = 0;
+
+	/*
+	 * The flags parameter to PR_Send is no longer used and is, according to
+	 * the documentation, required to be zero.
+	 */
+	n_write = PR_Send(port->pr_fd, ptr, len, flags, PR_INTERVAL_NO_WAIT);
+
+	if (n_write < 0)
+	{
+		err = PR_GetError();
+
+		if (err == PR_WOULD_BLOCK_ERROR)
+		{
+			*waitfor = WL_SOCKET_WRITEABLE;
+			errno = EWOULDBLOCK;
+		}
+		else
+			errno = ECONNRESET;
+	}
+
+	return n_write;
+}
+
+void
+be_tls_close(Port *port)
+{
+	if (!port)
+		return;
+
+	if (port->peer_cn)
+	{
+		SSL_InvalidateSession(port->pr_fd);
+		pfree(port->peer_cn);
+		port->peer_cn = NULL;
+	}
+
+	PR_Close(port->pr_fd);
+	port->pr_fd = NULL;
+	port->ssl_in_use = false;
+
+	if (nss_context)
+	{
+		NSS_ShutdownContext(nss_context);
+		nss_context = NULL;
+	}
+}
+
+void
+be_tls_destroy(void)
+{
+	/*
+	 * It reads a bit odd to clear a session cache when we are destroying the
+	 * context altogether, but if the session cache isn't cleared before
+	 * shutting down the context it will fail with SEC_ERROR_BUSY.
+	 */
+	SSL_ClearSessionCache();
+}
+
+int
+be_tls_get_cipher_bits(Port *port)
+{
+	SECStatus	status;
+	SSLChannelInfo channel;
+	SSLCipherSuiteInfo suite;
+
+	status = SSL_GetChannelInfo(port->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+		goto error;
+
+	status = SSL_GetCipherSuiteInfo(channel.cipherSuite, &suite, sizeof(suite));
+	if (status != SECSuccess)
+		goto error;
+
+	return suite.effectiveKeyBits;
+
+error:
+	ereport(WARNING,
+			(errmsg("unable to extract TLS session information: %s",
+					pg_SSLerrmessage(PR_GetError()))));
+	return 0;
+}
+
+/*
+ * be_tls_get_compression
+ *
+ * NSS disabled support for TLS compression in version 3.33 and removed the
+ * code in a subsequent release. The API for retrieving information about
+ * compression as well as enabling it is kept for backwards compatibility, but
+ * we don't need to consult it since it was only available for SSLv3 which we
+ * don't support.
+ *
+ * https://bugzilla.mozilla.org/show_bug.cgi?id=1409587
+ */
+bool
+be_tls_get_compression(Port *port)
+{
+	return false;
+}
+
+/*
+ * be_tls_get_version
+ *
+ * Returns the protocol version used for the current connection, or NULL in
+ * case of errors.
+ */
+const char *
+be_tls_get_version(Port *port)
+{
+	SECStatus	status;
+	SSLChannelInfo channel;
+
+	status = SSL_GetChannelInfo(port->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+	{
+		ereport(WARNING,
+				(errmsg("unable to extract TLS session information: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+		return NULL;
+	}
+
+	return ssl_protocol_version_to_string(channel.protocolVersion);
+}
+
+const char *
+be_tls_get_cipher(Port *port)
+{
+	SECStatus	status;
+	SSLChannelInfo channel;
+	SSLCipherSuiteInfo suite;
+
+	status = SSL_GetChannelInfo(port->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+		goto error;
+
+	status = SSL_GetCipherSuiteInfo(channel.cipherSuite, &suite, sizeof(suite));
+	if (status != SECSuccess)
+		goto error;
+
+	return suite.cipherSuiteName;
+
+error:
+	ereport(WARNING,
+			(errmsg("unable to extract TLS session information: %s",
+					pg_SSLerrmessage(PR_GetError()))));
+	return NULL;
+}
+
+void
+be_tls_get_peer_subject_name(Port *port, char *ptr, size_t len)
+{
+	CERTCertificate *certificate;
+
+	certificate = SSL_PeerCertificate(port->pr_fd);
+	if (certificate)
+		strlcpy(ptr, CERT_NameToAscii(&certificate->subject), len);
+	else
+		ptr[0] = '\0';
+}
+
+void
+be_tls_get_peer_issuer_name(Port *port, char *ptr, size_t len)
+{
+	CERTCertificate *certificate;
+
+	certificate = SSL_PeerCertificate(port->pr_fd);
+	if (certificate)
+		strlcpy(ptr, CERT_NameToAscii(&certificate->issuer), len);
+	else
+		ptr[0] = '\0';
+}
+
+void
+be_tls_get_peer_serial(Port *port, char *ptr, size_t len)
+{
+	CERTCertificate *certificate;
+
+	certificate = SSL_PeerCertificate(port->pr_fd);
+	if (certificate)
+		snprintf(ptr, len, "%li", DER_GetInteger(&(certificate->serialNumber)));
+	else
+		ptr[0] = '\0';
+}
+
+char *
+be_tls_get_certificate_hash(Port *port, size_t *len)
+{
+	CERTCertificate *certificate;
+	SECOidTag	signature_alg;
+	SECOidTag	digest_alg;
+	int			digest_len;
+	const NSSSignatureAlgorithms *candidate;
+	SECStatus	status;
+	PLArenaPool *arena = NULL;
+	SECItem		digest;
+	char	   *ret;
+
+	*len = 0;
+	certificate = SSL_LocalCertificate(port->pr_fd);
+	if (!certificate)
+		return NULL;
+
+	signature_alg = SECOID_GetAlgorithmTag(&certificate->signature);
+
+	candidate = NSS_SCRAMDigestAlgorithm;
+	while (candidate->signature)
+	{
+		if (signature_alg == candidate->signature)
+		{
+			digest_alg = candidate->hash;
+			digest_len = candidate->len;
+			break;
+		}
+
+		candidate++;
+	}
+
+	if (!candidate->signature)
+		elog(ERROR, "could not find digest for OID '%s'",
+			 SECOID_FindOIDTagDescription(signature_alg));
+
+	arena = PORT_NewArena(SEC_ASN1_DEFAULT_ARENA_SIZE);
+	digest.data = PORT_ArenaZAlloc(arena, sizeof(unsigned char) * digest_len);
+	digest.len = digest_len;
+
+	status = PK11_HashBuf(digest_alg, digest.data,
+						  certificate->derCert.data,
+						  certificate->derCert.len);
+
+	if (status != SECSuccess)
+	{
+		PORT_FreeArena(arena, PR_TRUE);
+		return NULL;
+	}
+
+	ret = palloc(digest.len);
+	memcpy(ret, digest.data, digest.len);
+	*len = digest_len;
+	PORT_FreeArena(arena, PR_TRUE);
+
+	return ret;
+}
+
+/* ------------------------------------------------------------ */
+/*						Internal functions						*/
+/* ------------------------------------------------------------ */
+
+/*
+ * default_nss_tls_init
+ *
+ * The default TLS init hook function which users can override for installing
+ * their own passphrase callbacks and similar actions. In case no callback has
+ * been configured, or the callback isn't reload capable during a server
+ * reload, the dummy callback will be installed.
+ *
+ * The private data for the callback is set differently depending on how it's
+ * invoked. For calls which may invoke the callback deeper in the callstack
+ * the private data is set with SSL_SetPKCS11PinArg. When the call is directly
+ * invoking the callback, like PK11_FindCertFromNickname, then the private
+ * data is passed as a parameter. Setting the data with SSL_SetPKCS11PinArg is
+ * thus not required but good practice.
+ *
+ * NSS doesn't provide a default callback like OpenSSL does, but a callback is
+ * required to be set.  The password callback can be installed at any time, but
+ * setting the private data with SSL_SetPKCS11PinArg requires a PR Filedesc.
+ */
+static void
+default_nss_tls_init(bool isServerStart)
+{
+	/*
+	 * No user-defined callback has been configured, install the dummy call-
+	 * back since we must set something.
+	 */
+	if (!ssl_passphrase_command[0])
+		PK11_SetPasswordFunc(dummy_ssl_passphrase_cb);
+	else
+	{
+		/*
+		 * There is a user-defined callback, set it unless we are in a restart
+		 * and cannot handle restarts due to an interactive callback.
+		 */
+		if (isServerStart)
+			PK11_SetPasswordFunc(external_ssl_passphrase_cb);
+		else
+		{
+			if (ssl_passphrase_command_supports_reload)
+				PK11_SetPasswordFunc(external_ssl_passphrase_cb);
+			else
+				PK11_SetPasswordFunc(dummy_ssl_passphrase_cb);
+		}
+	}
+}
+
+/*
+ * external_ssl_passphrase_cb
+ *
+ * Runs the callback configured by ssl_passphrase_command and returns the
+ * captured password back to NSS.
+ */
+static char *
+external_ssl_passphrase_cb(PK11SlotInfo *slot, PRBool retry, void *arg)
+{
+	/*
+	 * NSS use a hardcoded 256 byte buffer for reading the password so set the
+	 * same limit for our callback buffer.
+	 */
+	char		buf[256];
+	int			len;
+	char	   *password = NULL;
+	char	   *prompt;
+
+	/*
+	 * Since there is no password callback in NSS when the server starts up,
+	 * it makes little sense to create an interactive callback. Thus, if this
+	 * is a retry attempt then give up immediately.
+	 */
+	if (retry)
+		return NULL;
+
+	/*
+	 * Construct the same prompt that NSS uses internally even though it is
+	 * unlikely to serve much purpose, but we must set a prompt so we might as
+	 * well do it right.
+	 */
+	prompt = psprintf("Enter Password or Pin for \"%s\":",
+					  PK11_GetTokenName(slot));
+
+	len = run_ssl_passphrase_command(prompt, ssl_is_server_start, buf, sizeof(buf));
+	pfree(prompt);
+
+	if (!len)
+		return NULL;
+
+	/*
+	 * At least one byte with password content was returned, and NSS requires
+	 * that we return it allocated in NSS controlled memory. If we fail to
+	 * allocate then abort without passing back NULL and bubble up the error
+	 * on the PG side.
+	 */
+	password = (char *) PR_Malloc(len + 1);
+	if (!password)
+	{
+		explicit_bzero(buf, sizeof(buf));
+		ereport(ERROR,
+				(errcode(ERRCODE_OUT_OF_MEMORY),
+				 errmsg("out of memory")));
+	}
+	strlcpy(password, buf, sizeof(password));
+	explicit_bzero(buf, sizeof(buf));
+
+	return password;
+}
+
+/*
+ * dummy_ssl_passphrase_cb
+ *
+ * Return unsuccessful if we are asked to provide the passphrase for a cert or
+ * key, without having a passphrase callback installed.
+ */
+static char *
+dummy_ssl_passphrase_cb(PK11SlotInfo *slot, PRBool retry, void *arg)
+{
+	dummy_ssl_passwd_cb_called = true;
+	return NULL;
+}
+
+static SECStatus
+pg_bad_cert_handler(void *arg, PRFileDesc *fd)
+{
+	Port	   *port = (Port *) arg;
+
+	port->peer_cert_valid = false;
+	return SECFailure;
+}
+
+/*
+ * raw_subject_common_name
+ *
+ * Returns the Subject Common Name for the given certificate as a raw char
+ * buffer (that is, without any form of escaping for unprintable characters or
+ * embedded nulls), with the length of the buffer returned in the len param.
+ * The buffer is allocated in the TopMemoryContext and is given a NULL
+ * terminator so that callers are safe to call strlen() on it.
+ *
+ * This is used instead of CERT_GetCommonName(), which always performs quoting
+ * and/or escaping. NSS doesn't appear to give us a way to easily unescape the
+ * result, and we need to store the raw CN into port->peer_cn for compatibility
+ * with the OpenSSL implementation.
+ */
+static char *
+raw_subject_common_name(CERTCertificate *cert, unsigned int *len)
+{
+	CERTName	subject = cert->subject;
+	CERTRDN	  **rdn;
+
+	for (rdn = subject.rdns; *rdn; rdn++)
+	{
+		CERTAVA	  **ava;
+
+		for (ava = (*rdn)->avas; *ava; ava++)
+		{
+			SECItem	   *buf;
+			char	   *cn;
+
+			if (CERT_GetAVATag(*ava) != SEC_OID_AVA_COMMON_NAME)
+				continue;
+
+			/* Found a CN, ecode and copy it into a newly allocated buffer */
+			buf = CERT_DecodeAVAValue(&(*ava)->value);
+			if (!buf)
+			{
+				/*
+				 * This failure case is difficult to test. (Since this code
+				 * runs after certificate authentication has otherwise
+				 * succeeded, you'd need to convince a CA implementation to
+				 * sign a corrupted certificate in order to get here.)
+				 *
+				 * Follow the behavior of CERT_GetCommonName() in this case and
+				 * simply return NULL, as if a Common Name had not been found.
+				 */
+				goto fail;
+			}
+
+			cn = MemoryContextAlloc(TopMemoryContext, buf->len + 1);
+			memcpy(cn, buf->data, buf->len);
+			cn[buf->len] = '\0';
+
+			*len = buf->len;
+
+			SECITEM_FreeItem(buf, PR_TRUE);
+			return cn;
+		}
+	}
+
+fail:
+	/* Not found. */
+	*len = 0;
+	return NULL;
+}
+
+/*
+ * pg_cert_auth_handler
+ *
+ * Callback for validation of incoming certificates. Returning SECFailure will
+ * cause NSS to terminate the connection immediately.
+ */
+static SECStatus
+pg_cert_auth_handler(void *arg, PRFileDesc *fd, PRBool checksig, PRBool isServer)
+{
+	SECStatus	status;
+	Port	   *port = (Port *) arg;
+	CERTCertificate *cert;
+	char	   *peer_cn;
+	unsigned int len;
+
+	status = SSL_AuthCertificate(CERT_GetDefaultCertDB(), port->pr_fd, checksig, PR_TRUE);
+	if (status != SECSuccess)
+		return status;
+
+	port->peer_cn = NULL;
+	port->peer_cert_valid = false;
+
+	cert = SSL_PeerCertificate(port->pr_fd);
+	if (!cert)
+	{
+		/* Shouldn't be possible; why did we get a client cert callback? */
+		Assert(cert != NULL);
+
+		PR_SetError(SEC_ERROR_LIBRARY_FAILURE, 0);
+		return SECFailure;
+	}
+
+	peer_cn = raw_subject_common_name(cert, &len);
+	if (!peer_cn)
+	{
+		/* No Common Name, but the certificate otherwise checks out. */
+		port->peer_cert_valid = true;
+
+		status = SECSuccess;
+		goto cleanup;
+	}
+
+	/*
+	 * Reject embedded NULLs in certificate common name to prevent attacks like
+	 * CVE-2009-4034.
+	 */
+	if (len != strlen(peer_cn))
+	{
+		ereport(COMMERROR,
+				(errcode(ERRCODE_PROTOCOL_VIOLATION),
+				 errmsg("SSL certificate's common name contains embedded null")));
+
+		pfree(peer_cn);
+		PR_SetError(SEC_ERROR_CERT_NOT_VALID, 0);
+
+		status = SECFailure;
+		goto cleanup;
+	}
+
+	port->peer_cn = peer_cn;
+	port->peer_cert_valid = true;
+
+	status = SECSuccess;
+
+cleanup:
+	CERT_DestroyCertificate(cert);
+	return status;
+}
+
+static PRInt32
+pg_ssl_read(PRFileDesc *fd, void *buf, PRInt32 amount, PRIntn flags,
+			PRIntervalTime timeout)
+{
+	PRRecvFN	read_fn;
+	PRInt32		n_read;
+
+	read_fn = fd->lower->methods->recv;
+	n_read = read_fn(fd->lower, buf, amount, flags, timeout);
+
+	return n_read;
+}
+
+static PRInt32
+pg_ssl_write(PRFileDesc *fd, const void *buf, PRInt32 amount, PRIntn flags,
+			 PRIntervalTime timeout)
+{
+	PRSendFN	send_fn;
+	PRInt32		n_write;
+
+	send_fn = fd->lower->methods->send;
+	n_write = send_fn(fd->lower, buf, amount, flags, timeout);
+
+	return n_write;
+}
+
+static PRStatus
+pg_ssl_close(PRFileDesc *fd)
+{
+	/*
+	 * Disconnect our private Port from the fd before closing out the stack.
+	 * (Debug builds of NSPR will assert if we do not.)
+	 */
+	fd->secret = NULL;
+	return PR_GetDefaultIOMethods()->close(fd);
+}
+
+static PRFileDesc *
+init_iolayer(Port *port)
+{
+	const		PRIOMethods *default_methods;
+	PRFileDesc *layer;
+
+	/*
+	 * Start by initializing our layer with all the default methods so that we
+	 * can selectively override the ones we want while still ensuring that we
+	 * have a complete layer specification.
+	 */
+	default_methods = PR_GetDefaultIOMethods();
+	memcpy(&pr_iomethods, default_methods, sizeof(PRIOMethods));
+
+	pr_iomethods.recv = pg_ssl_read;
+	pr_iomethods.send = pg_ssl_write;
+	pr_iomethods.close = pg_ssl_close;
+
+	/*
+	 * Each IO layer must be identified by a unique name, where uniqueness is
+	 * per connection. Each connection in a postgres cluster can generate the
+	 * identity from the same string as they will create their IO layers on
+	 * different sockets. Only one layer per socket can have the same name.
+	 */
+	pr_id = PR_GetUniqueIdentity("PostgreSQL Server");
+	if (pr_id == PR_INVALID_IO_LAYER)
+	{
+		ereport(ERROR,
+				(errmsg("out of memory when setting up TLS connection")));
+		return NULL;
+	}
+
+	/*
+	 * Create the actual IO layer as a stub such that it can be pushed onto
+	 * the layer stack. The step via a stub is required as we define custom
+	 * callbacks.
+	 */
+	layer = PR_CreateIOLayerStub(pr_id, &pr_iomethods);
+	if (!layer)
+	{
+		ereport(ERROR,
+				(errmsg("unable to create NSS I/O layer")));
+		return NULL;
+	}
+
+	/* Store the Port as private data available in callbacks */
+	layer->secret = (void *) port;
+
+	return layer;
+}
+
+static char *
+ssl_protocol_version_to_string(int v)
+{
+	switch (v)
+	{
+			/* SSL v2 and v3 are not supported */
+		case SSL_LIBRARY_VERSION_2:
+		case SSL_LIBRARY_VERSION_3_0:
+			Assert(false);
+			break;
+
+		case SSL_LIBRARY_VERSION_TLS_1_0:
+			return pstrdup("TLSv1.0");
+		case SSL_LIBRARY_VERSION_TLS_1_1:
+			return pstrdup("TLSv1.1");
+		case SSL_LIBRARY_VERSION_TLS_1_2:
+			return pstrdup("TLSv1.2");
+		case SSL_LIBRARY_VERSION_TLS_1_3:
+			return pstrdup("TLSv1.3");
+	}
+
+	return pstrdup("unknown");
+}
+
+
+/*
+ * ssl_protocol_version_to_nss
+ *			Translate PostgreSQL TLS version to NSS version
+ *
+ * Returns zero in case the requested TLS version is undefined (PG_ANY) and
+ * should be set by the caller, or -1 on failure.
+ */
+static uint16
+ssl_protocol_version_to_nss(int v, const char *guc_name)
+{
+	switch (v)
+	{
+			/*
+			 * There is no SSL_LIBRARY_ macro defined in NSS with the value
+			 * zero, so we use this to signal the caller that the highest
+			 * useful version should be set on the connection.
+			 */
+		case PG_TLS_ANY:
+			return 0;
+
+			/*
+			 * No guard is required here as there are no versions of NSS
+			 * without support for TLS1.
+			 */
+		case PG_TLS1_VERSION:
+			return SSL_LIBRARY_VERSION_TLS_1_0;
+		case PG_TLS1_1_VERSION:
+#ifdef SSL_LIBRARY_VERSION_TLS_1_1
+			return SSL_LIBRARY_VERSION_TLS_1_1;
+#else
+			break;
+#endif
+		case PG_TLS1_2_VERSION:
+#ifdef SSL_LIBRARY_VERSION_TLS_1_2
+			return SSL_LIBRARY_VERSION_TLS_1_2;
+#else
+			break;
+#endif
+		case PG_TLS1_3_VERSION:
+#ifdef SSL_LIBRARY_VERSION_TLS_1_3
+			return SSL_LIBRARY_VERSION_TLS_1_3;
+#else
+			break;
+#endif
+		default:
+			break;
+	}
+
+	return -1;
+}
+
+/*
+ * pg_SSLerrmessage
+ *		Create and return a human readable error message given
+ *		the specified error code
+ *
+ * PR_ErrorToName only converts the enum identifier of the error to string,
+ * but that can be quite useful for debugging (and in case PR_ErrorToString is
+ * unable to render a message then we at least have something).
+ */
+static char *
+pg_SSLerrmessage(PRErrorCode errcode)
+{
+	return psprintf("%s (%s)",
+					PR_ErrorToString(errcode, PR_LANGUAGE_I_DEFAULT),
+					PR_ErrorToName(errcode));
+}
+
+/*
+ * pg_SSLShutdownFunc
+ *		Callback for NSS shutdown
+ *
+ * If NSS is terminated from the outside when the connection is still in use
+ * we must treat this as potentially hostile and immediately close to avoid
+ * leaking the connection in any way. Once this is called, NSS will shutdown
+ * regardless so we may as well clean up the best we can. Returning SECFailure
+ * will cause the NSS shutdown to return with an error, but it will shutdown
+ * nevertheless. nss_data is reserved for future use and is always NULL.
+ */
+static SECStatus
+pg_SSLShutdownFunc(void *private_data, void *nss_data)
+{
+	Port *port = (Port *) private_data;
+
+	if (!port || !port->ssl_in_use)
+		return SECSuccess;
+
+	/*
+	 * There is a connection still open, close it and signal to whatever that
+	 * called the shutdown that it was erroneous.
+	 */
+	be_tls_close(port);
+	be_tls_destroy();
+
+	return SECFailure;
+}
diff --git a/src/backend/libpq/be-secure.c b/src/backend/libpq/be-secure.c
index 4cf139a223..5e0c27c134 100644
--- a/src/backend/libpq/be-secure.c
+++ b/src/backend/libpq/be-secure.c
@@ -49,6 +49,9 @@ bool		ssl_passphrase_command_supports_reload;
 #ifdef USE_SSL
 bool		ssl_loaded_verify_locations = false;
 #endif
+#ifdef USE_NSS
+char	   *ssl_database;
+#endif
 
 /* GUC variable controlling SSL cipher list */
 char	   *SSLCipherSuites = NULL;
diff --git a/src/backend/libpq/hba.c b/src/backend/libpq/hba.c
index 20bf1461ce..9a04c093d5 100644
--- a/src/backend/libpq/hba.c
+++ b/src/backend/libpq/hba.c
@@ -1041,7 +1041,7 @@ parse_hba_line(TokenizedLine *tok_line, int elevel)
 			ereport(elevel,
 					(errcode(ERRCODE_CONFIG_FILE_ERROR),
 					 errmsg("hostssl record cannot match because SSL is not supported by this build"),
-					 errhint("Compile with --with-ssl=openssl to use SSL connections."),
+					 errhint("Compile with --with-ssl to use SSL connections."),
 					 errcontext("line %d of configuration file \"%s\"",
 								line_num, HbaFileName)));
 			*err_msg = "hostssl record cannot match because SSL is not supported by this build";
diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c
index eafdb1118e..b023b31c46 100644
--- a/src/backend/utils/misc/guc.c
+++ b/src/backend/utils/misc/guc.c
@@ -4308,7 +4308,11 @@ static struct config_string ConfigureNamesString[] =
 		},
 		&ssl_library,
 #ifdef USE_SSL
+#if defined(USE_OPENSSL)
 		"OpenSSL",
+#elif defined(USE_NSS)
+		"NSS",
+#endif
 #else
 		"",
 #endif
@@ -4366,6 +4370,18 @@ static struct config_string ConfigureNamesString[] =
 		check_canonical_path, assign_pgstat_temp_directory, NULL
 	},
 
+#ifdef USE_NSS
+	{
+		{"ssl_database", PGC_SIGHUP, CONN_AUTH_SSL,
+			gettext_noop("Location of the NSS certificate database."),
+			NULL
+		},
+		&ssl_database,
+		"",
+		NULL, NULL, NULL
+	},
+#endif
+
 	{
 		{"synchronous_standby_names", PGC_SIGHUP, REPLICATION_PRIMARY,
 			gettext_noop("Number of synchronous standbys and list of names of potential synchronous ones."),
@@ -4394,8 +4410,10 @@ static struct config_string ConfigureNamesString[] =
 			GUC_SUPERUSER_ONLY
 		},
 		&SSLCipherSuites,
-#ifdef USE_OPENSSL
+#if defined(USE_OPENSSL)
 		"HIGH:MEDIUM:+3DES:!aNULL",
+#elif defined (USE_NSS)
+		"",
 #else
 		"none",
 #endif
diff --git a/src/common/Makefile b/src/common/Makefile
index 5422579a6a..be8b2583b2 100644
--- a/src/common/Makefile
+++ b/src/common/Makefile
@@ -85,12 +85,17 @@ OBJS_COMMON += \
 	protocol_openssl.o \
 	cryptohash_openssl.o
 else
+ifeq ($(with_ssl),nss)
+OBJS_COMMON += \
+	cryptohash_nss.o
+else
 OBJS_COMMON += \
 	cryptohash.o \
 	md5.o \
 	sha1.o \
 	sha2.o
 endif
+endif
 
 # A few files are currently only built for frontend, not server
 # (Mkvcbuild.pm has a copy of this list, too).  logging.c is excluded
diff --git a/src/include/common/pg_nss.h b/src/include/common/pg_nss.h
new file mode 100644
index 0000000000..008fee85f1
--- /dev/null
+++ b/src/include/common/pg_nss.h
@@ -0,0 +1,175 @@
+/*-------------------------------------------------------------------------
+ *
+ * pg_nss.h
+ *	  Support for NSS as a TLS backend
+ *
+ * These definitions are used by both frontend and backend code.
+ *
+ * Copyright (c) 2020, PostgreSQL Global Development Group
+ *
+ * IDENTIFICATION
+ *        src/include/common/pg_nss.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef PG_NSS_H
+#define PG_NSS_H
+
+#ifdef USE_NSS
+#define NO_NSPR_10_SUPPORT
+#include <nss/hasht.h>
+#include <nss/secoidt.h>
+#include <nss/sslproto.h>
+
+PRUint16	pg_find_cipher(char *name);
+
+typedef struct
+{
+	SECOidTag	signature;
+	SECOidTag	hash;
+	int			len;
+}			NSSSignatureAlgorithms;
+
+typedef struct
+{
+	const char *name;
+	PRUint16	number;
+}			NSSCiphers;
+
+#define INVALID_CIPHER	0xFFFF
+
+static const NSSSignatureAlgorithms NSS_SCRAMDigestAlgorithm[] = {
+
+	{SEC_OID_PKCS1_MD5_WITH_RSA_ENCRYPTION, SEC_OID_SHA256, SHA256_LENGTH},
+	{SEC_OID_PKCS1_SHA1_WITH_RSA_ENCRYPTION, SEC_OID_SHA256, SHA256_LENGTH},
+	{SEC_OID_ISO_SHA_WITH_RSA_SIGNATURE, SEC_OID_SHA256, SHA256_LENGTH},
+	{SEC_OID_ISO_SHA1_WITH_RSA_SIGNATURE, SEC_OID_SHA256, SHA256_LENGTH},
+	{SEC_OID_PKCS5_PBE_WITH_MD5_AND_DES_CBC, SEC_OID_SHA256, SHA256_LENGTH},
+
+	{SEC_OID_ANSIX962_ECDSA_SHA224_SIGNATURE, SEC_OID_SHA224, SHA224_LENGTH},
+	{SEC_OID_PKCS1_SHA224_WITH_RSA_ENCRYPTION, SEC_OID_SHA224, SHA224_LENGTH},
+	{SEC_OID_NIST_DSA_SIGNATURE_WITH_SHA224_DIGEST, SEC_OID_SHA224, SHA224_LENGTH},
+
+	{SEC_OID_ANSIX962_ECDSA_SHA256_SIGNATURE, SEC_OID_SHA256, SHA256_LENGTH},
+	{SEC_OID_PKCS1_SHA256_WITH_RSA_ENCRYPTION, SEC_OID_SHA256, SHA256_LENGTH},
+	{SEC_OID_NIST_DSA_SIGNATURE_WITH_SHA256_DIGEST, SEC_OID_SHA256, SHA256_LENGTH},
+
+	{SEC_OID_ANSIX962_ECDSA_SHA384_SIGNATURE, SEC_OID_SHA384, SHA384_LENGTH},
+	{SEC_OID_PKCS1_SHA384_WITH_RSA_ENCRYPTION, SEC_OID_SHA384, SHA384_LENGTH},
+
+	{SEC_OID_ANSIX962_ECDSA_SHA512_SIGNATURE, SEC_OID_SHA512, SHA512_LENGTH},
+	{SEC_OID_PKCS1_SHA512_WITH_RSA_ENCRYPTION, SEC_OID_SHA512, SHA512_LENGTH},
+
+	{0, 0}
+};
+
+/*
+ * This list is a partial copy of the ciphers in NSS files lib/ssl/sslproto.h
+ * in order to provide a human readable version of the ciphers. It would be
+ * nice to not have to have this, but NSS doesn't provide any API addressing
+ * the ciphers by name. TODO: do we want more of the ciphers, or perhaps less?
+ */
+static const NSSCiphers NSS_CipherList[] = {
+
+	{"TLS_NULL_WITH_NULL_NULL", TLS_NULL_WITH_NULL_NULL},
+
+	{"TLS_RSA_WITH_NULL_MD5", TLS_RSA_WITH_NULL_MD5},
+	{"TLS_RSA_WITH_NULL_SHA", TLS_RSA_WITH_NULL_SHA},
+	{"TLS_RSA_WITH_RC4_128_MD5", TLS_RSA_WITH_RC4_128_MD5},
+	{"TLS_RSA_WITH_RC4_128_SHA", TLS_RSA_WITH_RC4_128_SHA},
+	{"TLS_RSA_WITH_IDEA_CBC_SHA", TLS_RSA_WITH_IDEA_CBC_SHA},
+	{"TLS_RSA_WITH_DES_CBC_SHA", TLS_RSA_WITH_DES_CBC_SHA},
+	{"TLS_RSA_WITH_3DES_EDE_CBC_SHA", TLS_RSA_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_DH_DSS_WITH_DES_CBC_SHA", TLS_DH_DSS_WITH_DES_CBC_SHA},
+	{"TLS_DH_DSS_WITH_3DES_EDE_CBC_SHA", TLS_DH_DSS_WITH_3DES_EDE_CBC_SHA},
+	{"TLS_DH_RSA_WITH_DES_CBC_SHA", TLS_DH_RSA_WITH_DES_CBC_SHA},
+	{"TLS_DH_RSA_WITH_3DES_EDE_CBC_SHA", TLS_DH_RSA_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_DHE_DSS_WITH_DES_CBC_SHA", TLS_DHE_DSS_WITH_DES_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_3DES_EDE_CBC_SHA", TLS_DHE_DSS_WITH_3DES_EDE_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_DES_CBC_SHA", TLS_DHE_RSA_WITH_DES_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA", TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_DH_anon_WITH_RC4_128_MD5", TLS_DH_anon_WITH_RC4_128_MD5},
+	{"TLS_DH_anon_WITH_DES_CBC_SHA", TLS_DH_anon_WITH_DES_CBC_SHA},
+	{"TLS_DH_anon_WITH_3DES_EDE_CBC_SHA", TLS_DH_anon_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_RSA_WITH_AES_128_CBC_SHA", TLS_RSA_WITH_AES_128_CBC_SHA},
+	{"TLS_DH_DSS_WITH_AES_128_CBC_SHA", TLS_DH_DSS_WITH_AES_128_CBC_SHA},
+	{"TLS_DH_RSA_WITH_AES_128_CBC_SHA", TLS_DH_RSA_WITH_AES_128_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_AES_128_CBC_SHA", TLS_DHE_DSS_WITH_AES_128_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_AES_128_CBC_SHA", TLS_DHE_RSA_WITH_AES_128_CBC_SHA},
+	{"TLS_DH_anon_WITH_AES_128_CBC_SHA", TLS_DH_anon_WITH_AES_128_CBC_SHA},
+
+	{"TLS_RSA_WITH_AES_256_CBC_SHA", TLS_RSA_WITH_AES_256_CBC_SHA},
+	{"TLS_DH_DSS_WITH_AES_256_CBC_SHA", TLS_DH_DSS_WITH_AES_256_CBC_SHA},
+	{"TLS_DH_RSA_WITH_AES_256_CBC_SHA", TLS_DH_RSA_WITH_AES_256_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_AES_256_CBC_SHA", TLS_DHE_DSS_WITH_AES_256_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_AES_256_CBC_SHA", TLS_DHE_RSA_WITH_AES_256_CBC_SHA},
+	{"TLS_DH_anon_WITH_AES_256_CBC_SHA", TLS_DH_anon_WITH_AES_256_CBC_SHA},
+	{"TLS_RSA_WITH_NULL_SHA256", TLS_RSA_WITH_NULL_SHA256},
+	{"TLS_RSA_WITH_AES_128_CBC_SHA256", TLS_RSA_WITH_AES_128_CBC_SHA256},
+	{"TLS_RSA_WITH_AES_256_CBC_SHA256", TLS_RSA_WITH_AES_256_CBC_SHA256},
+
+	{"TLS_DHE_DSS_WITH_AES_128_CBC_SHA256", TLS_DHE_DSS_WITH_AES_128_CBC_SHA256},
+	{"TLS_RSA_WITH_CAMELLIA_128_CBC_SHA", TLS_RSA_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DH_DSS_WITH_CAMELLIA_128_CBC_SHA", TLS_DH_DSS_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DH_RSA_WITH_CAMELLIA_128_CBC_SHA", TLS_DH_RSA_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_CAMELLIA_128_CBC_SHA", TLS_DHE_DSS_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA", TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DH_anon_WITH_CAMELLIA_128_CBC_SHA", TLS_DH_anon_WITH_CAMELLIA_128_CBC_SHA},
+
+	{"TLS_DHE_DSS_WITH_RC4_128_SHA", TLS_DHE_DSS_WITH_RC4_128_SHA},
+	{"TLS_DHE_RSA_WITH_AES_128_CBC_SHA256", TLS_DHE_RSA_WITH_AES_128_CBC_SHA256},
+	{"TLS_DHE_DSS_WITH_AES_256_CBC_SHA256", TLS_DHE_DSS_WITH_AES_256_CBC_SHA256},
+	{"TLS_DHE_RSA_WITH_AES_256_CBC_SHA256", TLS_DHE_RSA_WITH_AES_256_CBC_SHA256},
+
+	{"TLS_RSA_WITH_CAMELLIA_256_CBC_SHA", TLS_RSA_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DH_DSS_WITH_CAMELLIA_256_CBC_SHA", TLS_DH_DSS_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DH_RSA_WITH_CAMELLIA_256_CBC_SHA", TLS_DH_RSA_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_CAMELLIA_256_CBC_SHA", TLS_DHE_DSS_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA", TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DH_anon_WITH_CAMELLIA_256_CBC_SHA", TLS_DH_anon_WITH_CAMELLIA_256_CBC_SHA},
+
+	{"TLS_RSA_WITH_SEED_CBC_SHA", TLS_RSA_WITH_SEED_CBC_SHA},
+
+	{"TLS_RSA_WITH_AES_128_GCM_SHA256", TLS_RSA_WITH_AES_128_GCM_SHA256},
+	{"TLS_RSA_WITH_AES_256_GCM_SHA384", TLS_RSA_WITH_AES_256_GCM_SHA384},
+	{"TLS_DHE_RSA_WITH_AES_128_GCM_SHA256", TLS_DHE_RSA_WITH_AES_128_GCM_SHA256},
+	{"TLS_DHE_RSA_WITH_AES_256_GCM_SHA384", TLS_DHE_RSA_WITH_AES_256_GCM_SHA384},
+	{"TLS_DHE_DSS_WITH_AES_128_GCM_SHA256", TLS_DHE_DSS_WITH_AES_128_GCM_SHA256},
+	{"TLS_DHE_DSS_WITH_AES_256_GCM_SHA384", TLS_DHE_DSS_WITH_AES_256_GCM_SHA384},
+
+	{"TLS_AES_128_GCM_SHA256", TLS_AES_128_GCM_SHA256},
+	{"TLS_AES_256_GCM_SHA384", TLS_AES_256_GCM_SHA384},
+	{"TLS_CHACHA20_POLY1305_SHA256", TLS_CHACHA20_POLY1305_SHA256},
+	{NULL, 0}
+};
+
+/*
+ * pg_find_cipher
+ *			Translate an NSS ciphername to the cipher code
+ *
+ * Searches the configured ciphers for the corresponding cipher code to the
+ * name. Search is performed case insensitive.
+ */
+PRUint16
+pg_find_cipher(char *name)
+{
+	const		NSSCiphers *cipher_list = NSS_CipherList;
+
+	while (cipher_list->name)
+	{
+		if (pg_strcasecmp(cipher_list->name, name) == 0)
+			return cipher_list->number;
+
+		cipher_list++;
+	}
+
+	return 0xFFFF;
+}
+
+#endif							/* USE_NSS */
+
+#endif							/* PG_NSS_H */
diff --git a/src/include/libpq/libpq-be.h b/src/include/libpq/libpq-be.h
index 66a8673d93..ea373a0ae0 100644
--- a/src/include/libpq/libpq-be.h
+++ b/src/include/libpq/libpq-be.h
@@ -193,13 +193,18 @@ typedef struct Port
 	bool		peer_cert_valid;
 
 	/*
-	 * OpenSSL structures. (Keep these last so that the locations of other
-	 * fields are the same whether or not you build with OpenSSL.)
+	 * SSL backend specific structures. (Keep these last so that the locations
+	 * of other fields are the same whether or not you build with SSL
+	 * enabled.)
 	 */
 #ifdef USE_OPENSSL
 	SSL		   *ssl;
 	X509	   *peer;
 #endif
+
+#ifdef USE_NSS
+	void	   *pr_fd;
+#endif
 } Port;
 
 #ifdef USE_SSL
@@ -283,7 +288,7 @@ extern void be_tls_get_peer_serial(Port *port, char *ptr, size_t len);
  * This is not supported with old versions of OpenSSL that don't have
  * the X509_get_signature_nid() function.
  */
-#if defined(USE_OPENSSL) && defined(HAVE_X509_GET_SIGNATURE_NID)
+#if defined(USE_NSS) || (defined(USE_OPENSSL) && defined(HAVE_X509_GET_SIGNATURE_NID))
 #define HAVE_BE_TLS_GET_CERTIFICATE_HASH
 extern char *be_tls_get_certificate_hash(Port *port, size_t *len);
 #endif
@@ -293,6 +298,10 @@ extern char *be_tls_get_certificate_hash(Port *port, size_t *len);
 typedef void (*openssl_tls_init_hook_typ) (SSL_CTX *context, bool isServerStart);
 extern PGDLLIMPORT openssl_tls_init_hook_typ openssl_tls_init_hook;
 #endif
+#ifdef USE_NSS
+typedef void (*nss_tls_init_hook_type) (bool isServerStart);
+extern PGDLLIMPORT nss_tls_init_hook_type nss_tls_init_hook;
+#endif
 
 #endif							/* USE_SSL */
 
diff --git a/src/include/libpq/libpq.h b/src/include/libpq/libpq.h
index a55898c85a..d2860b852f 100644
--- a/src/include/libpq/libpq.h
+++ b/src/include/libpq/libpq.h
@@ -88,6 +88,9 @@ extern PGDLLIMPORT bool ssl_passphrase_command_supports_reload;
 #ifdef USE_SSL
 extern bool ssl_loaded_verify_locations;
 #endif
+#ifdef USE_NSS
+extern char *ssl_database;
+#endif
 
 extern int	secure_initialize(bool isServerStart);
 extern bool secure_loaded_verify_locations(void);
diff --git a/src/include/pg_config.h.in b/src/include/pg_config.h.in
index 55cab4d2bf..8856a33590 100644
--- a/src/include/pg_config.h.in
+++ b/src/include/pg_config.h.in
@@ -905,6 +905,9 @@
 /* Define to 1 to build with PAM support. (--with-pam) */
 #undef USE_PAM
 
+/* Define to build with NSS support (--with-ssl=nss) */
+#undef USE_NSS
+
 /* Define to 1 to use software CRC-32C implementation (slicing-by-8). */
 #undef USE_SLICING_BY_8_CRC32C
 
diff --git a/src/include/pg_config_manual.h b/src/include/pg_config_manual.h
index d27c8601fa..7861b94290 100644
--- a/src/include/pg_config_manual.h
+++ b/src/include/pg_config_manual.h
@@ -176,10 +176,9 @@
 
 /*
  * USE_SSL code should be compiled only when compiling with an SSL
- * implementation.  (Currently, only OpenSSL is supported, but we might add
- * more implementations in the future.)
+ * implementation.
  */
-#ifdef USE_OPENSSL
+#if defined(USE_OPENSSL) || defined(USE_NSS)
 #define USE_SSL
 #endif
 
diff --git a/src/interfaces/libpq/Makefile b/src/interfaces/libpq/Makefile
index f74677eaf9..e10d8bef42 100644
--- a/src/interfaces/libpq/Makefile
+++ b/src/interfaces/libpq/Makefile
@@ -56,6 +56,11 @@ OBJS += \
 	fe-secure-openssl.o
 endif
 
+ifeq ($(with_ssl), nss)
+OBJS += \
+	fe-secure-nss.o
+endif
+
 ifeq ($(with_gssapi),yes)
 OBJS += \
 	fe-gssapi-common.o \
diff --git a/src/interfaces/libpq/fe-connect.c b/src/interfaces/libpq/fe-connect.c
index 8ca0583aa9..1eeeff54a8 100644
--- a/src/interfaces/libpq/fe-connect.c
+++ b/src/interfaces/libpq/fe-connect.c
@@ -355,6 +355,10 @@ static const internalPQconninfoOption PQconninfoOptions[] = {
 		"Target-Session-Attrs", "", 11, /* sizeof("read-write") = 11 */
 	offsetof(struct pg_conn, target_session_attrs)},
 
+	{"cert_database", NULL, NULL, NULL,
+		"CertificateDatabase", "", 64,
+	offsetof(struct pg_conn, cert_database)},
+
 	/* Terminating entry --- MUST BE LAST */
 	{NULL, NULL, NULL, NULL,
 	NULL, NULL, 0}
diff --git a/src/interfaces/libpq/fe-secure-nss.c b/src/interfaces/libpq/fe-secure-nss.c
new file mode 100644
index 0000000000..dca0572e67
--- /dev/null
+++ b/src/interfaces/libpq/fe-secure-nss.c
@@ -0,0 +1,1112 @@
+/*-------------------------------------------------------------------------
+ *
+ * fe-secure-nss.c
+ *	  functions for supporting NSS as a TLS backend for frontend libpq
+ *
+ * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ *	  src/interfaces/libpq/fe-secure-nss.c
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#include "postgres_fe.h"
+
+#include "libpq-fe.h"
+#include "fe-auth.h"
+#include "fe-secure-common.h"
+#include "libpq-int.h"
+#include "common/pg_nss.h"
+
+/*
+ * BITS_PER_BYTE is also defined in the NSPR header files, so we need to undef
+ * our version to avoid compiler warnings on redefinition.
+ */
+#define pg_BITS_PER_BYTE BITS_PER_BYTE
+#undef BITS_PER_BYTE
+
+/*
+ * The nspr/obsolete/protypes.h NSPR header typedefs uint64 and int64 with
+ * colliding definitions from ours, causing a much expected compiler error.
+ * Remove backwards compatibility with ancient NSPR versions to avoid this.
+ */
+#define NO_NSPR_10_SUPPORT
+#include <nspr/nspr.h>
+#include <nspr/prerror.h>
+#include <nspr/prinit.h>
+#include <nspr/prio.h>
+#include <nss/hasht.h>
+#include <nss/nss.h>
+#include <nss/ssl.h>
+#include <nss/sslproto.h>
+#include <nss/pk11func.h>
+#include <nss/secerr.h>
+#include <nss/secoidt.h>
+#include <nss/secmod.h>
+
+/*
+ * Ensure that the colliding definitions match, else throw an error. In case
+ * NSPR remove the definition in a future version (however unlikely that may
+ * be, make sure to put ours back again.
+ */
+#if defined(BITS_PER_BYTE)
+#if BITS_PER_BYTE != pg_BITS_PER_BYTE
+#error "incompatible byte widths between NSPR and PostgreSQL"
+#endif
+#else
+#define BITS_PER_BYTE pg_BITS_PER_BYTE
+#endif
+#undef pg_BITS_PER_BYTE
+
+static SECStatus pg_load_nss_module(SECMODModule * *module, const char *library, const char *name);
+static SECStatus pg_bad_cert_handler(void *arg, PRFileDesc * fd);
+static const char *pg_SSLerrmessage(PRErrorCode errcode);
+static SECStatus pg_client_auth_handler(void *arg, PRFileDesc * socket, CERTDistNames * caNames,
+										CERTCertificate * *pRetCert, SECKEYPrivateKey * *pRetKey);
+static SECStatus pg_cert_auth_handler(void *arg, PRFileDesc * fd, PRBool checksig, PRBool isServer);
+static int	ssl_protocol_version_to_nss(const char *protocol);
+static bool cert_database_has_CA(PGconn *conn);
+
+static char *PQssl_passwd_cb(PK11SlotInfo * slot, PRBool retry, void *arg);
+
+/*
+ * PR_ImportTCPSocket() is a private API, but very widely used, as it's the
+ * only way to make NSS use an already set up POSIX file descriptor rather
+ * than opening one itself. To quote the NSS documentation:
+ *
+ *		"In theory, code that uses PR_ImportTCPSocket may break when NSPR's
+ *		implementation changes. In practice, this is unlikely to happen because
+ *		NSPR's implementation has been stable for years and because of NSPR's
+ *		strong commitment to backward compatibility."
+ *
+ * https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSPR/Reference/PR_ImportTCPSocket
+ *
+ * The function is declared in <private/pprio.h>, but as it is a header marked
+ * private we declare it here rather than including it.
+ */
+NSPR_API(PRFileDesc *) PR_ImportTCPSocket(int);
+
+static SECMODModule * ca_trust = NULL;
+static NSSInitContext * nss_context = NULL;
+
+/*
+ * This logic exist in NSS as well, but it's only available for when there is
+ * a database to open, and not only using the system trust store. Thus, we
+ * need to keep our own copy.
+ */
+#if defined(WIN32)
+static const char *ca_trust_name = "nssckbi.dll";
+#elif defined(__darwin__)
+static const char *ca_trust_name = "libnssckbi.dylib";
+#else
+static const char *ca_trust_name = "libnssckbi.so";
+#endif
+
+static PQsslKeyPassHook_nss_type PQsslKeyPassHook = NULL;
+
+/* ------------------------------------------------------------ */
+/*			 Procedures common to all secure sessions			*/
+/* ------------------------------------------------------------ */
+
+/*
+ * pgtls_init_library
+ *
+ * There is no direct equivalent for PQinitOpenSSL in NSS/NSPR, with PR_Init
+ * being the closest match there is. PR_Init is however already documented to
+ * not be required so simply making this a noop seems like the best option.
+ */
+void
+pgtls_init_library(bool do_ssl, int do_crypto)
+{
+	/* noop */
+}
+
+int
+pgtls_init(PGconn *conn)
+{
+	conn->ssl_in_use = false;
+	conn->has_password = false;
+
+	return 0;
+}
+
+void
+pgtls_close(PGconn *conn)
+{
+	if (nss_context)
+	{
+		NSS_ShutdownContext(nss_context);
+		nss_context = NULL;
+	}
+}
+
+PostgresPollingStatusType
+pgtls_open_client(PGconn *conn)
+{
+	SECStatus	status;
+	PRFileDesc *pr_fd;
+	PRFileDesc *model;
+	NSSInitParameters params;
+	SSLVersionRange desired_range;
+
+	/*
+	 * The NSPR documentation states that runtime initialization via PR_Init
+	 * is no longer required, as the first caller into NSPR will perform the
+	 * initialization implicitly. See be-secure-nss.c for further discussion
+	 * on PR_Init.
+	 */
+	PR_Init(PR_USER_THREAD, PR_PRIORITY_NORMAL, 0);
+
+	/*
+	 * NSS initialization and the use of contexts is further discussed in
+	 * be-secure-nss.c
+	 */
+	memset(&params, 0, sizeof(params));
+	params.length = sizeof(params);
+
+	if (conn->cert_database && strlen(conn->cert_database) > 0)
+	{
+		char	   *cert_database_path = psprintf("sql:%s", conn->cert_database);
+
+		nss_context = NSS_InitContext(cert_database_path, "", "", "",
+									  &params,
+									  NSS_INIT_READONLY | NSS_INIT_PK11RELOAD);
+		pfree(cert_database_path);
+
+		if (!nss_context)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("unable to open certificate database \"%s\": %s"),
+							  conn->cert_database,
+							  pg_SSLerrmessage(PR_GetError()));
+			return PGRES_POLLING_FAILED;
+		}
+	}
+	else
+	{
+		nss_context = NSS_InitContext("", "", "", "", &params,
+									  NSS_INIT_READONLY | NSS_INIT_NOCERTDB |
+									  NSS_INIT_NOMODDB | NSS_INIT_FORCEOPEN |
+									  NSS_INIT_NOROOTINIT | NSS_INIT_PK11RELOAD);
+		if (!nss_context)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("unable to create certificate database: %s"),
+							  pg_SSLerrmessage(PR_GetError()));
+			return PGRES_POLLING_FAILED;
+		}
+	}
+
+	/*
+	 * Configure cipher policy.
+	 */
+	status = NSS_SetDomesticPolicy();
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to configure cipher policy: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * If we don't have a certificate database, the system trust store is the
+	 * fallback we can use. If we fail to initialize that as well, we can
+	 * still attempt a connection as long as the sslmode isn't verify*.
+	 */
+	if (!conn->cert_database && conn->sslmode[0] == 'v')
+	{
+		status = pg_load_nss_module(&ca_trust, ca_trust_name, "\"Root Certificates\"");
+		if (status != SECSuccess)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("WARNING: unable to load NSS trust module \"%s\" : %s"),
+							  ca_trust_name,
+							  pg_SSLerrmessage(PR_GetError()));
+
+			return PGRES_POLLING_FAILED;
+		}
+	}
+
+
+	PK11_SetPasswordFunc(PQssl_passwd_cb);
+
+	/*
+	 * Import the already opened socket as we don't want to use NSPR functions
+	 * for opening the network socket due to how the PostgreSQL protocol works
+	 * with TLS connections. This function is not part of the NSPR public API,
+	 * see the comment at the top of the file for the rationale of still using
+	 * it.
+	 */
+	pr_fd = PR_ImportTCPSocket(conn->sock);
+	if (!pr_fd)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to attach to socket: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * Most of the documentation available, and implementations of, NSS/NSPR
+	 * use the PR_NewTCPSocket() function here, which has the drawback that it
+	 * can only create IPv4 sockets. Instead use PR_OpenTCPSocket() which
+	 * copes with IPv6 as well.
+	 */
+	model = SSL_ImportFD(NULL, PR_OpenTCPSocket(conn->laddr.addr.ss_family));
+	if (!model)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to enable TLS: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/* Disable old protocol versions (SSLv2 and SSLv3) */
+	SSL_OptionSet(model, SSL_ENABLE_SSL2, PR_FALSE);
+	SSL_OptionSet(model, SSL_V2_COMPATIBLE_HELLO, PR_FALSE);
+	SSL_OptionSet(model, SSL_ENABLE_SSL3, PR_FALSE);
+
+#ifdef SSL_CBC_RANDOM_IV
+
+	/*
+	 * Enable protection against the BEAST attack in case the NSS library has
+	 * support for that. While SSLv3 is disabled, we may still allow TLSv1
+	 * which is affected. The option isn't documented as an SSL option, but as
+	 * an NSS environment variable.
+	 */
+	SSL_OptionSet(model, SSL_CBC_RANDOM_IV, PR_TRUE);
+#endif
+
+	/* Set us up as a TLS client for the handshake */
+	SSL_OptionSet(model, SSL_HANDSHAKE_AS_CLIENT, PR_TRUE);
+
+	/*
+	 * When setting the available protocols, we either use the user defined
+	 * configuration values, and if missing we accept whatever is the highest
+	 * version supported by the library as the max and only limit the range in
+	 * the other end at TLSv1.0. ssl_variant_stream is a ProtocolVariant enum
+	 * for Stream protocols, rather than datagram.
+	 */
+	SSL_VersionRangeGetSupported(ssl_variant_stream, &desired_range);
+	desired_range.min = SSL_LIBRARY_VERSION_TLS_1_0;
+
+	if (conn->ssl_min_protocol_version && strlen(conn->ssl_min_protocol_version) > 0)
+	{
+		int			ssl_min_ver = ssl_protocol_version_to_nss(conn->ssl_min_protocol_version);
+
+		if (ssl_min_ver == -1)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("invalid value \"%s\" for minimum version of SSL protocol\n"),
+							  conn->ssl_min_protocol_version);
+			return -1;
+		}
+
+		desired_range.min = ssl_min_ver;
+	}
+
+	if (conn->ssl_max_protocol_version && strlen(conn->ssl_max_protocol_version) > 0)
+	{
+		int			ssl_max_ver = ssl_protocol_version_to_nss(conn->ssl_max_protocol_version);
+
+		if (ssl_max_ver == -1)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("invalid value \"%s\" for maximum version of SSL protocol\n"),
+							  conn->ssl_max_protocol_version);
+			return -1;
+		}
+
+		desired_range.max = ssl_max_ver;
+	}
+
+	if (SSL_VersionRangeSet(model, &desired_range) != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to set allowed SSL protocol version range: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * Set up callback for verifying server certificates, as well as for how
+	 * to handle failed verifications.
+	 */
+	SSL_AuthCertificateHook(model, pg_cert_auth_handler, (void *) conn);
+	SSL_BadCertHook(model, pg_bad_cert_handler, (void *) conn);
+
+	/*
+	 * Convert the NSPR socket to an SSL socket. Ensuring the success of this
+	 * operation is critical as NSS SSL_* functions may return SECSuccess on
+	 * the socket even though SSL hasn't been enabled, which introduce a risk
+	 * of silent downgrades.
+	 */
+	conn->pr_fd = SSL_ImportFD(model, pr_fd);
+	if (!conn->pr_fd)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to configure client for TLS: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * The model can now we closed as we've applied the settings of the model
+	 * onto the real socket. From hereon we should only use conn->pr_fd.
+	 */
+	PR_Close(model);
+
+	/* Set the private data to be passed to the password callback */
+	SSL_SetPKCS11PinArg(conn->pr_fd, (void *) conn);
+
+	/*
+	 * If a CRL file has been specified, verify if it exists in the database
+	 * but don't fail in case it doesn't.
+	 */
+	if (conn->sslcrl && strlen(conn->sslcrl) > 0)
+	{
+		/* XXX: Implement me.. */
+	}
+
+	status = SSL_ResetHandshake(conn->pr_fd, PR_FALSE);
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to initiate handshake: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * Set callback for client authentication when requested by the server.
+	 */
+	SSL_GetClientAuthDataHook(conn->pr_fd, pg_client_auth_handler, (void *) conn);
+
+	/*
+	 * Specify which hostname we are expecting to talk to. This is required,
+	 * albeit mostly applies to when opening a connection to a traditional
+	 * http server it seems.
+	 */
+	SSL_SetURL(conn->pr_fd, (conn->connhost[conn->whichhost]).host);
+
+	do
+	{
+		status = SSL_ForceHandshake(conn->pr_fd);
+	}
+	while (status != SECSuccess && PR_GetError() == PR_WOULD_BLOCK_ERROR);
+
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("SSL error: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	conn->ssl_in_use = true;
+	return PGRES_POLLING_OK;
+}
+
+ssize_t
+pgtls_read(PGconn *conn, void *ptr, size_t len)
+{
+	PRInt32		nread;
+	PRErrorCode status;
+	int			read_errno = 0;
+
+	/*
+	 * PR_Recv blocks until there is data to read or the timeout expires. We
+	 * don't want to sit blocked here, so the timeout is turned off by using
+	 * PR_INTERVAL_NO_WAIT which means "return immediately",  Zero is returned
+	 * for closed connections, while -1 indicates an error within the ongoing
+	 * connection.
+	 */
+	nread = PR_Recv(conn->pr_fd, ptr, len, 0, PR_INTERVAL_NO_WAIT);
+
+	if (nread == 0)
+	{
+		read_errno = ECONNRESET;
+		nread = -1;
+	}
+	else if (nread == -1)
+	{
+		status = PR_GetError();
+
+		switch (status)
+		{
+			case PR_IO_TIMEOUT_ERROR:
+				/* No data available yet. */
+				nread = 0;
+				break;
+
+			case PR_WOULD_BLOCK_ERROR:
+				read_errno = EWOULDBLOCK;
+				break;
+
+				/*
+				 * The error cases for PR_Recv are not documented, but can be
+				 * reverse engineered from _MD_unix_map_default_error() in the
+				 * NSPR code, defined in pr/src/md/unix/unix_errors.c.
+				 */
+			case PR_NETWORK_UNREACHABLE_ERROR:
+			case PR_CONNECT_RESET_ERROR:
+				read_errno = ECONNRESET;
+				break;
+
+			default:
+				break;
+		}
+
+		if (nread == -1)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("TLS read error: %s"),
+							  pg_SSLerrmessage(status));
+		}
+	}
+
+	SOCK_ERRNO_SET(read_errno);
+	return (ssize_t) nread;
+}
+
+/*
+ * pgtls_read_pending
+ *		Check for the existence of data to be read.
+ *
+ * This is part of the PostgreSQL TLS backend API.
+ */
+bool
+pgtls_read_pending(PGconn *conn)
+{
+	unsigned char c;
+	int			n;
+
+	/*
+	 * PR_Recv peeks into the stream with the timeount turned off, to see if
+	 * there is another byte to read off the wire. There is an NSS function
+	 * SSL_DataPending() which might seem like a better fit, but it will only
+	 * check already encrypted data in the SSL buffer, not still unencrypted
+	 * data, thus it doesn't guarantee that a subsequent call to
+	 * PR_Read/PR_Recv won't block.
+	 */
+	n = PR_Recv(conn->pr_fd, &c, 1, PR_MSG_PEEK, PR_INTERVAL_NO_WAIT);
+	return (n > 0);
+}
+
+ssize_t
+pgtls_write(PGconn *conn, const void *ptr, size_t len)
+{
+	PRInt32		n;
+	PRErrorCode status;
+	int			write_errno = 0;
+
+	n = PR_Write(conn->pr_fd, ptr, len);
+
+	if (n < 0)
+	{
+		status = PR_GetError();
+
+		switch (status)
+		{
+			case PR_WOULD_BLOCK_ERROR:
+#ifdef EAGAIN
+				write_errno = EAGAIN;
+#else
+				write_errno = EINTR;
+#endif
+				break;
+
+			default:
+				printfPQExpBuffer(&conn->errorMessage,
+								  libpq_gettext("TLS write error: %s"),
+								  pg_SSLerrmessage(status));
+				write_errno = ECONNRESET;
+				break;
+		}
+	}
+
+	SOCK_ERRNO_SET(write_errno);
+	return (ssize_t) n;
+}
+
+char *
+pgtls_get_peer_certificate_hash(PGconn *conn, size_t *len)
+{
+	CERTCertificate *server_cert;
+	SECOidTag	signature_alg;
+	SECOidTag	digest_alg;
+	int			digest_len;
+	const NSSSignatureAlgorithms *candidate;
+	PLArenaPool *arena;
+	SECItem		digest;
+	char	   *ret;
+	SECStatus	status;
+
+	*len = 0;
+
+	server_cert = SSL_PeerCertificate(conn->pr_fd);
+	if (!server_cert)
+		return NULL;
+
+	signature_alg = SECOID_GetAlgorithmTag(&server_cert->signature);
+
+	candidate = NSS_SCRAMDigestAlgorithm;
+	while (candidate->signature)
+	{
+		if (signature_alg == candidate->signature)
+		{
+			digest_alg = candidate->hash;
+			digest_len = candidate->len;
+			break;
+		}
+
+		candidate++;
+	}
+
+	if (!candidate->signature)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("could not find digest for OID '%s'\n"),
+						  SECOID_FindOIDTagDescription(signature_alg));
+		return NULL;
+	}
+
+	arena = PORT_NewArena(SEC_ASN1_DEFAULT_ARENA_SIZE);
+	digest.data = PORT_ArenaZAlloc(arena, sizeof(unsigned char) * digest_len);
+	digest.len = digest_len;
+
+	status = PK11_HashBuf(digest_alg, digest.data, server_cert->derCert.data,
+						  server_cert->derCert.len);
+
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to generate peer certificate digest: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		PORT_FreeArena(arena, PR_TRUE);
+		return NULL;
+	}
+
+	ret = pg_malloc(digest.len);
+	memcpy(ret, digest.data, digest.len);
+	*len = digest_len;
+	PORT_FreeArena(arena, PR_TRUE);
+
+	return ret;
+}
+
+/*
+ *	Verify that the server certificate matches the hostname we connected to.
+ *
+ * The certificate's Common Name and Subject Alternative Names are considered.
+ */
+int
+pgtls_verify_peer_name_matches_certificate_guts(PGconn *conn,
+												int *names_examined,
+												char **first_name)
+{
+	char	   *server_hostname = NULL;
+	CERTCertificate *server_cert = NULL;
+	SECStatus	status = SECSuccess;
+	SECItem		altname_item;
+	PLArenaPool *arena = NULL;
+	CERTGeneralName *san_list;
+	CERTGeneralName *cn;
+
+	server_hostname = SSL_RevealURL(conn->pr_fd);
+	if (!server_hostname || server_hostname[0] == '\0')
+		goto done;
+
+	/*
+	 * CERT_VerifyCertName will internally perform RFC 2818 SubjectAltName
+	 * verification.
+	 */
+	server_cert = SSL_PeerCertificate(conn->pr_fd);
+	status = CERT_VerifyCertName(server_cert, server_hostname);
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to verify server hostname: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		goto done;
+	}
+
+	status = CERT_FindCertExtension(server_cert, SEC_OID_X509_SUBJECT_ALT_NAME,
+									&altname_item);
+	if (status == SECSuccess)
+	{
+		arena = PORT_NewArena(DER_DEFAULT_CHUNKSIZE);
+		if (!arena)
+		{
+			status = SECFailure;
+			goto done;
+		}
+		san_list = CERT_DecodeAltNameExtension(arena, &altname_item);
+		if (!san_list)
+		{
+			status = SECFailure;
+			goto done;
+		}
+
+		for (cn = san_list; cn != san_list; cn = CERT_GetNextGeneralName(cn))
+		{
+			char	   *alt_name;
+			int			rv;
+			char		tmp[512];
+
+			status = CERT_RFC1485_EscapeAndQuote(tmp, sizeof(tmp),
+												 (char *) cn->name.other.data,
+												 cn->name.other.len);
+
+			if (status != SECSuccess)
+				goto done;
+
+			rv = pq_verify_peer_name_matches_certificate_name(conn, tmp,
+															  strlen(tmp),
+															  &alt_name);
+			if (alt_name)
+			{
+				if (!*first_name)
+					*first_name = alt_name;
+				else
+					free(alt_name);
+			}
+
+			if (rv == 1)
+				status = SECSuccess;
+			else
+			{
+				status = SECFailure;
+				break;
+			}
+		}
+	}
+	else if (PORT_GetError() == SEC_ERROR_EXTENSION_NOT_FOUND)
+		status = SECSuccess;
+	else
+		status = SECSuccess;
+
+done:
+	/* san_list will be freed by freeing the arena it was allocated in */
+	if (arena)
+		PORT_FreeArena(arena, PR_TRUE);
+	PR_Free(server_hostname);
+
+	if (status == SECSuccess)
+		return 1;
+
+	return 0;
+}
+
+/* ------------------------------------------------------------ */
+/*			PostgreSQL specific TLS support functions			*/
+/* ------------------------------------------------------------ */
+
+static const char *
+pg_SSLerrmessage(PRErrorCode errcode)
+{
+	const char *error;
+
+	/*
+	 * Try to get the user friendly error description, and if that fails try
+	 * to fall back on the name of the PRErrorCode.
+	 */
+	error = PR_ErrorToString(errcode, PR_LANGUAGE_I_DEFAULT);
+	if (!error)
+		error = PR_ErrorToName(errcode);
+	if (error)
+		return error;
+
+	return "unknown TLS error";
+}
+
+static SECStatus
+pg_load_nss_module(SECMODModule * *module, const char *library, const char *name)
+{
+	SECMODModule *mod;
+	char	   *modulespec;
+
+	modulespec = psprintf("library=\"%s\", name=\"%s\"", library, name);
+
+	/*
+	 * Attempt to load the specified module. The second parameter is "parent"
+	 * which should always be NULL for application code. The third parameter
+	 * defines if loading should recurse which is only applicable when loading
+	 * a module from within another module. This hierarchy would have to be
+	 * defined in the modulespec, and since we don't support anything but
+	 * directly addressed modules we should pass PR_FALSE.
+	 */
+	mod = SECMOD_LoadUserModule(modulespec, NULL, PR_FALSE);
+	pfree(modulespec);
+
+	if (mod && mod->loaded)
+	{
+		*module = mod;
+		return SECSuccess;
+	}
+
+	SECMOD_DestroyModule(mod);
+	return SECFailure;
+}
+
+/* ------------------------------------------------------------ */
+/*						NSS Callbacks							*/
+/* ------------------------------------------------------------ */
+
+/*
+ * pg_cert_auth_handler
+ *			Callback for authenticating server certificate
+ *
+ * This is pretty much the same procedure as the SSL_AuthCertificate function
+ * provided by NSS, with the difference being server hostname validation. With
+ * SSL_AuthCertificate there is no way to do verify-ca, it only does the -full
+ * flavor of our sslmodes, so we need our own implementation.
+ */
+static SECStatus
+pg_cert_auth_handler(void *arg, PRFileDesc *fd, PRBool checksig, PRBool isServer)
+{
+	SECStatus	status;
+	PGconn	   *conn = (PGconn *) arg;
+	CERTCertificate *server_cert;
+	void	   *pin;
+
+	Assert(!isServer);
+
+	pin = SSL_RevealPinArg(conn->pr_fd);
+	server_cert = SSL_PeerCertificate(conn->pr_fd);
+
+	status = CERT_VerifyCertificateNow((CERTCertDBHandle *) CERT_GetDefaultCertDB(),
+									   server_cert,
+									   checksig,
+									   certificateUsageSSLServer,
+									   pin,
+									   NULL);
+
+	/*
+	 * If we've already failed validation then there is no point in also
+	 * performing the hostname check for verify-full.
+	 */
+	if (status == SECSuccess)
+	{
+		if (!pq_verify_peer_name_matches_certificate(conn))
+			status = SECFailure;
+	}
+	else
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to verify certificate: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+	}
+
+	return status;
+}
+
+/*
+ * pg_client_auth_handler
+ *		Callback for client certificate validation
+ *
+ * The client auth callback is not on by default in NSS, so we need to invoke
+ * it ourselves to ensure we can do cert authentication. A TODO is to support
+ * running without a specified sslcert parameter. By retrieving all the certs
+ * via nickname from the cert database and see if we find one which apply with
+ * NSS_CmpCertChainWCANames() and PK11_FindKeyByAnyCert() we could support
+ * just running with a ssl database specified.
+ *
+ * For now, we use the default client certificate validation which requires a
+ * defined nickname to identify the cert in the database.
+ */
+static SECStatus
+pg_client_auth_handler(void *arg, PRFileDesc * socket, CERTDistNames * caNames,
+					   CERTCertificate * *pRetCert, SECKEYPrivateKey * *pRetKey)
+{
+	PGconn	   *conn = (PGconn *) arg;
+
+	return NSS_GetClientAuthData(conn->sslcert, socket, caNames, pRetCert, pRetKey);
+}
+
+/*
+ * pg_bad_cert_handler
+ *		Callback for failed certificate validation
+ *
+ * The TLS handshake will call this function iff the server certificate failed
+ * validation. Depending on the sslmode, we allow the connection anyways.
+ */
+static SECStatus
+pg_bad_cert_handler(void *arg, PRFileDesc * fd)
+{
+	PGconn	   *conn = (PGconn *) arg;
+	PRErrorCode err;
+
+	/*
+	 * This really shouldn't happen, as we've set the PGconn object as our
+	 * callback data, and at the callsite we know it will be populated. That
+	 * being said, the NSS code itself performs this check even when it should
+	 * not be required so let's use the same belts with our suspenders.
+	 */
+	if (!arg)
+		return SECFailure;
+
+	/*
+	 * For sslmodes other than verify-full and verify-ca we don't perform peer
+	 * validation, so return immediately.  sslmode require with a database
+	 * specified which contains a CA certificate will work like verify-ca to
+	 * be compatible with the OpenSSL implementation.
+	 */
+	if (strcmp(conn->sslmode, "require") == 0)
+	{
+		if (conn->cert_database && strlen(conn->cert_database) > 0 && cert_database_has_CA(conn))
+			return SECFailure;
+	}
+	if (conn->sslmode[0] == 'v')
+		return SECFailure;
+
+	err = PORT_GetError();
+
+	/*
+	 * TODO: these are relevant error codes that can occur in certificate
+	 * validation, figure out which we don't want for require/prefer etc.
+	 */
+	switch (err)
+	{
+		case SEC_ERROR_INVALID_AVA:
+		case SEC_ERROR_INVALID_TIME:
+		case SEC_ERROR_BAD_SIGNATURE:
+		case SEC_ERROR_EXPIRED_CERTIFICATE:
+		case SEC_ERROR_UNKNOWN_ISSUER:
+		case SEC_ERROR_UNTRUSTED_ISSUER:
+		case SEC_ERROR_UNTRUSTED_CERT:
+		case SEC_ERROR_CERT_VALID:
+		case SEC_ERROR_EXPIRED_ISSUER_CERTIFICATE:
+		case SEC_ERROR_CRL_EXPIRED:
+		case SEC_ERROR_CRL_BAD_SIGNATURE:
+		case SEC_ERROR_EXTENSION_VALUE_INVALID:
+		case SEC_ERROR_CA_CERT_INVALID:
+		case SEC_ERROR_CERT_USAGES_INVALID:
+		case SEC_ERROR_UNKNOWN_CRITICAL_EXTENSION:
+			return SECSuccess;
+			break;
+		default:
+			return SECFailure;
+			break;
+	}
+
+	/* Unreachable */
+	return SECSuccess;
+}
+
+/* ------------------------------------------------------------ */
+/*					SSL information functions					*/
+/* ------------------------------------------------------------ */
+
+/*
+ * PQgetssl
+ *
+ * Return NULL as this is legacy and defined to always be equal to calling
+ * PQsslStruct(conn, "OpenSSL"); This should ideally trigger a logged warning
+ * somewhere as it's nonsensical to run in a non-OpenSSL build, but the color
+ * of said bikeshed hasn't yet been determined.
+ */
+void *
+PQgetssl(PGconn *conn)
+{
+	return NULL;
+}
+
+void *
+PQsslStruct(PGconn *conn, const char *struct_name)
+{
+	if (!conn)
+		return NULL;
+
+	/*
+	 * Return the underlying PRFileDesc which can be used to access
+	 * information on the connection details. There is no SSL context per se.
+	 */
+	if (strcmp(struct_name, "NSS") == 0)
+		return conn->pr_fd;
+	return NULL;
+}
+
+const char *const *
+PQsslAttributeNames(PGconn *conn)
+{
+	static const char *const result[] = {
+		"library",
+		"cipher",
+		"protocol",
+		"key_bits",
+		"compression",
+		NULL
+	};
+
+	return result;
+}
+
+const char *
+PQsslAttribute(PGconn *conn, const char *attribute_name)
+{
+	SECStatus	status;
+	SSLChannelInfo channel;
+	SSLCipherSuiteInfo suite;
+
+	if (!conn || !conn->pr_fd)
+		return NULL;
+
+	if (strcmp(attribute_name, "library") == 0)
+		return "NSS";
+
+	status = SSL_GetChannelInfo(conn->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+		return NULL;
+
+	status = SSL_GetCipherSuiteInfo(channel.cipherSuite, &suite, sizeof(suite));
+	if (status != SECSuccess)
+		return NULL;
+
+	if (strcmp(attribute_name, "cipher") == 0)
+		return suite.cipherSuiteName;
+
+	if (strcmp(attribute_name, "key_bits") == 0)
+	{
+		static char key_bits_str[8];
+
+		snprintf(key_bits_str, sizeof(key_bits_str), "%i", suite.effectiveKeyBits);
+		return key_bits_str;
+	}
+
+	if (strcmp(attribute_name, "protocol") == 0)
+	{
+		switch (channel.protocolVersion)
+		{
+#ifdef SSL_LIBRARY_VERSION_TLS_1_3
+			case SSL_LIBRARY_VERSION_TLS_1_3:
+				return "TLSv1.3";
+#endif
+#ifdef SSL_LIBRARY_VERSION_TLS_1_2
+			case SSL_LIBRARY_VERSION_TLS_1_2:
+				return "TLSv1.2";
+#endif
+#ifdef SSL_LIBRARY_VERSION_TLS_1_1
+			case SSL_LIBRARY_VERSION_TLS_1_1:
+				return "TLSv1.1";
+#endif
+			case SSL_LIBRARY_VERSION_TLS_1_0:
+				return "TLSv1.0";
+			default:
+				return "unknown";
+		}
+	}
+
+	/*
+	 * NSS disabled support for compression in version 3.33, and it was only
+	 * available for SSLv3 at that point anyways, so we can safely return off
+	 * here without checking.
+	 */
+	if (strcmp(attribute_name, "compression") == 0)
+		return "off";
+
+	return NULL;
+}
+
+static int
+ssl_protocol_version_to_nss(const char *protocol)
+{
+	if (pg_strcasecmp("TLSv1", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_0;
+
+#ifdef SSL_LIBRARY_VERSION_TLS_1_1
+	if (pg_strcasecmp("TLSv1.1", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_1;
+#endif
+
+#ifdef SSL_LIBRARY_VERSION_TLS_1_2
+	if (pg_strcasecmp("TLSv1.2", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_2;
+#endif
+
+#ifdef SSL_LIBRARY_VERSION_TLS_1_3
+	if (pg_strcasecmp("TLSv1.3", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_3;
+#endif
+
+	return -1;
+}
+
+/*
+ * cert_database_has_CA
+ *
+ * Returns true in case there is a CA certificate in the database connected
+ * to in the conn object, else false. This function only checks for the
+ * presence of a CA certificate, not it's validity and/or usefulness.
+ */
+static bool
+cert_database_has_CA(PGconn *conn)
+{
+	CERTCertList *certificates;
+	bool		hasCA;
+
+	/*
+	 * If the certificate database has a password we must provide it, since
+	 * this API doesn't invoke the standard password callback.
+	 */
+	if (conn->has_password)
+		certificates = PK11_ListCerts(PK11CertListCA, PQssl_passwd_cb(NULL, PR_FALSE, (void *) conn));
+	else
+		certificates = PK11_ListCerts(PK11CertListCA, NULL);
+	hasCA = !CERT_LIST_EMPTY(certificates);
+	CERT_DestroyCertList(certificates);
+
+	return hasCA;
+}
+
+PQsslKeyPassHook_nss_type
+PQgetSSLKeyPassHook_nss(void)
+{
+	return PQsslKeyPassHook;
+}
+
+void
+PQsetSSLKeyPassHook_nss(PQsslKeyPassHook_nss_type hook)
+{
+	PQsslKeyPassHook = hook;
+}
+
+/*
+ * Supply a password to decrypt a client certificate.
+ *
+ * This must match NSS type PK11PasswordFunc.
+ */
+static char *
+PQssl_passwd_cb(PK11SlotInfo *slot, PRBool retry, void *arg)
+{
+	PGconn	   *conn = (PGconn *) arg;
+
+	conn->has_password = true;
+
+	if (PQsslKeyPassHook)
+		return PQsslKeyPassHook(slot, (PRBool) retry, arg);
+	else
+		return PQdefaultSSLKeyPassHook_nss(slot, retry, arg);
+}
+
+/*
+ * The default password handler callback.
+ */
+char *
+PQdefaultSSLKeyPassHook_nss(PK11SlotInfo * slot, PRBool retry, void *arg)
+{
+	PGconn	   *conn = (PGconn *) arg;
+
+	/*
+	 * If the password didn't work the first time there is no point in
+	 * retrying as it hasn't changed.
+	 */
+	if (retry != PR_TRUE && conn->sslpassword && strlen(conn->sslpassword) > 0)
+		return PORT_Strdup(conn->sslpassword);
+
+	return NULL;
+}
diff --git a/src/interfaces/libpq/fe-secure.c b/src/interfaces/libpq/fe-secure.c
index 00b87bdc96..44385ee391 100644
--- a/src/interfaces/libpq/fe-secure.c
+++ b/src/interfaces/libpq/fe-secure.c
@@ -421,6 +421,9 @@ PQsslAttributeNames(PGconn *conn)
 
 	return result;
 }
+#endif							/* USE_SSL */
+
+#ifndef USE_OPENSSL
 
 PQsslKeyPassHook_OpenSSL_type
 PQgetSSLKeyPassHook_OpenSSL(void)
@@ -439,7 +442,7 @@ PQdefaultSSLKeyPassHook_OpenSSL(char *buf, int size, PGconn *conn)
 {
 	return 0;
 }
-#endif							/* USE_SSL */
+#endif							/* USE_OPENSSL */
 
 /* Dummy version of GSSAPI information functions, when built without GSS support */
 #ifndef ENABLE_GSS
diff --git a/src/interfaces/libpq/libpq-fe.h b/src/interfaces/libpq/libpq-fe.h
index c266ad5b13..aba32e6635 100644
--- a/src/interfaces/libpq/libpq-fe.h
+++ b/src/interfaces/libpq/libpq-fe.h
@@ -619,12 +619,23 @@ extern int	pg_valid_server_encoding_id(int encoding);
 
 /* === in fe-secure-openssl.c === */
 
-/* Support for overriding sslpassword handling with a callback. */
+/* Support for overriding sslpassword handling with a callback */
 typedef int (*PQsslKeyPassHook_OpenSSL_type) (char *buf, int size, PGconn *conn);
 extern PQsslKeyPassHook_OpenSSL_type PQgetSSLKeyPassHook_OpenSSL(void);
 extern void PQsetSSLKeyPassHook_OpenSSL(PQsslKeyPassHook_OpenSSL_type hook);
 extern int	PQdefaultSSLKeyPassHook_OpenSSL(char *buf, int size, PGconn *conn);
 
+/* == in fe-secure-nss.c === */
+typedef struct PK11SlotInfoStr PK11SlotInfo;
+typedef int PRIntn;
+typedef PRIntn PRBool;
+
+/* Support for overriding sslpassword handling with a callback */
+typedef char *(*PQsslKeyPassHook_nss_type) (PK11SlotInfo *slot, PRBool retry, void *arg);
+extern PQsslKeyPassHook_nss_type PQgetSSLKeyPassHook_nss(void);
+extern void PQsetSSLKeyPassHook_nss(PQsslKeyPassHook_nss_type hook);
+extern char *PQdefaultSSLKeyPassHook_nss(PK11SlotInfo *slot, PRBool retry, void *arg);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/src/interfaces/libpq/libpq-int.h b/src/interfaces/libpq/libpq-int.h
index 4db498369c..a95450fbba 100644
--- a/src/interfaces/libpq/libpq-int.h
+++ b/src/interfaces/libpq/libpq-int.h
@@ -362,6 +362,7 @@ struct pg_conn
 	char	   *sslpassword;	/* client key file password */
 	char	   *sslrootcert;	/* root certificate filename */
 	char	   *sslcrl;			/* certificate revocation list filename */
+	char	   *cert_database;	/* NSS certificate/key database */
 	char	   *requirepeer;	/* required peer credentials for local sockets */
 	char	   *gssencmode;		/* GSS mode (require,prefer,disable) */
 	char	   *krbsrvname;		/* Kerberos service name */
@@ -485,6 +486,23 @@ struct pg_conn
 								 * OpenSSL version changes */
 #endif
 #endif							/* USE_OPENSSL */
+
+#ifdef USE_NSS
+	void	   *pr_fd;			/* NSPR file descriptor for the connection */
+
+	/*
+	 * Track whether the NSS database has a password set or not. There is no
+	 * API function for retrieving password status of a database, but we need
+	 * to know since some NSS API calls require the password passed in (they
+	 * don't call the callback themselves). To track, we simply flip this to
+	 * true in case NSS invoked the password callback - as that will only
+	 * happen in case there is a password. The reason for tracking this is
+	 * that there are calls which require a password parameter, but doesn't
+	 * use the callbacks provided, so we must call the callback on behalf of
+	 * these.
+	 */
+	bool		has_password;
+#endif							/* USE_NSS */
 #endif							/* USE_SSL */
 
 #ifdef ENABLE_GSS
@@ -759,7 +777,7 @@ extern ssize_t pgtls_write(PGconn *conn, const void *ptr, size_t len);
  * This is not supported with old versions of OpenSSL that don't have
  * the X509_get_signature_nid() function.
  */
-#if defined(USE_OPENSSL) && defined(HAVE_X509_GET_SIGNATURE_NID)
+#if defined(USE_NSS) || (defined(USE_OPENSSL) && defined(HAVE_X509_GET_SIGNATURE_NID))
 #define HAVE_PGTLS_GET_PEER_CERTIFICATE_HASH
 extern char *pgtls_get_peer_certificate_hash(PGconn *conn, size_t *len);
 #endif
diff --git a/src/tools/msvc/Mkvcbuild.pm b/src/tools/msvc/Mkvcbuild.pm
index 90328db04e..ff01acf3f6 100644
--- a/src/tools/msvc/Mkvcbuild.pm
+++ b/src/tools/msvc/Mkvcbuild.pm
@@ -195,12 +195,19 @@ sub mkvcbuild
 	$postgres->FullExportDLL('postgres.lib');
 
 	# The OBJS scraper doesn't know about ifdefs, so remove appropriate files
-	# if building without OpenSSL.
-	if (!$solution->{options}->{openssl})
+	# if building without various options.
+	if (!$solution->{options}->{openssl} && !$solution->{options}->{nss})
 	{
 		$postgres->RemoveFile('src/backend/libpq/be-secure-common.c');
+	}
+	if (!$solution->{options}->{openssl})
+	{
 		$postgres->RemoveFile('src/backend/libpq/be-secure-openssl.c');
 	}
+	if (!$solution->{options}->{nss})
+	{
+		$postgres->RemoveFile('src/backend/libpq/be-secure-nss.c');
+	}
 	if (!$solution->{options}->{gss})
 	{
 		$postgres->RemoveFile('src/backend/libpq/be-gssapi-common.c');
@@ -258,12 +265,19 @@ sub mkvcbuild
 	$libpq->AddReference($libpgcommon, $libpgport);
 
 	# The OBJS scraper doesn't know about ifdefs, so remove appropriate files
-	# if building without OpenSSL.
-	if (!$solution->{options}->{openssl})
+	# if building without various options
+	if (!$solution->{options}->{openssl} && !$solution->{options}->{nss})
 	{
 		$libpq->RemoveFile('src/interfaces/libpq/fe-secure-common.c');
+	}
+	if (!$solution->{options}->{openssl})
+	{
 		$libpq->RemoveFile('src/interfaces/libpq/fe-secure-openssl.c');
 	}
+	if (!$solution->{options}->{nss})
+	{
+		$libpq->RemoveFile('src/interfaces/libpq/fe-secure-nss.c');
+	}
 	if (!$solution->{options}->{gss})
 	{
 		$libpq->RemoveFile('src/interfaces/libpq/fe-gssapi-common.c');
diff --git a/src/tools/msvc/Solution.pm b/src/tools/msvc/Solution.pm
index 1c0c92fcd2..5148708969 100644
--- a/src/tools/msvc/Solution.pm
+++ b/src/tools/msvc/Solution.pm
@@ -488,6 +488,7 @@ sub GenerateFiles
 		USE_LLVM                   => undef,
 		USE_NAMED_POSIX_SEMAPHORES => undef,
 		USE_OPENSSL                => undef,
+		USE_NSS                    => undef,
 		USE_PAM                    => undef,
 		USE_SLICING_BY_8_CRC32C    => undef,
 		USE_SSE42_CRC32C           => undef,
@@ -540,6 +541,10 @@ sub GenerateFiles
 			$define{HAVE_OPENSSL_INIT_SSL}      = 1;
 		}
 	}
+	if ($self->{options}->{nss})
+	{
+		$define{USE_NSS} = 1;
+	}
 
 	$self->GenerateConfigHeader('src/include/pg_config.h',     \%define, 1);
 	$self->GenerateConfigHeader('src/include/pg_config_ext.h', \%define, 0);
@@ -1005,6 +1010,21 @@ sub AddProject
 			}
 		}
 	}
+	if ($self->{options}->{nss})
+	{
+		$proj->AddIncludeDir($self->{options}->{nss} . '\..\public\nss');
+		$proj->AddIncludeDir($self->{options}->{nss} . '\include\nspr');
+		foreach my $lib (qw(plds4 plc4 nspr4))
+		{
+			$proj->AddLibrary($self->{options}->{nss} .
+							  '\lib\lib' . "$lib.lib", 0);
+		}
+		foreach my $lib (qw(ssl3 smime3 nss3))
+		{
+			$proj->AddLibrary($self->{options}->{nss} .
+							  '\lib' . "\\$lib.dll.lib", 0);
+		}
+	}
 	if ($self->{options}->{nls})
 	{
 		$proj->AddIncludeDir($self->{options}->{nls} . '\include');
-- 
2.25.1

From f64fd9a6a6f03d2fb6eb1d5c2c4f31bccf8eaf8f Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Wed, 28 Oct 2020 11:22:26 +0100
Subject: [PATCH v25 2/6] NSS Testharness updates

TODO:
	* Generate certificate/keys with NSS tooling for NSS specific test
	* Add test for certificate with embedded nulls
	* Fix SCRAM tests when channel binding works

Daniel Gustafsson, Jacob Champion
---
 src/test/ssl/Makefile                         | 234 ++++++++++++
 src/test/ssl/t/001_ssltests.pl                | 340 +++++++++++-------
 src/test/ssl/t/002_scram.pl                   |  37 +-
 src/test/ssl/t/SSL/Backend/NSS.pm             |  73 ++++
 src/test/ssl/t/SSL/Backend/OpenSSL.pm         | 103 ++++++
 .../ssl/t/{SSLServer.pm => SSL/Server.pm}     |  80 ++++-
 6 files changed, 704 insertions(+), 163 deletions(-)
 create mode 100644 src/test/ssl/t/SSL/Backend/NSS.pm
 create mode 100644 src/test/ssl/t/SSL/Backend/OpenSSL.pm
 rename src/test/ssl/t/{SSLServer.pm => SSL/Server.pm} (78%)

diff --git a/src/test/ssl/Makefile b/src/test/ssl/Makefile
index d545382eea..c8032a2c13 100644
--- a/src/test/ssl/Makefile
+++ b/src/test/ssl/Makefile
@@ -30,6 +30,35 @@ SSLFILES := $(CERTIFICATES:%=ssl/%.key) $(CERTIFICATES:%=ssl/%.crt) \
 	ssl/client+client_ca.crt ssl/client-der.key \
 	ssl/client-encrypted-pem.key ssl/client-encrypted-der.key
 
+# Even though we in practice could get away with far fewer NSS databases, they
+# are generated to mimic the setup for the OpenSSL tests in order to ensure
+# we isolate the same behavior between the backends. The database name should
+# contain the files included for easier test suite code reading.
+NSSFILES := ssl/nss/client_ca.crt.db \
+	ssl/nss/server_ca.crt.db \
+	ssl/nss/root+server_ca.crt.db \
+	ssl/nss/root+client_ca.crt.db \
+	ssl/nss/client.crt__client.key.db \
+	ssl/nss/client-revoked.crt__client-revoked.key.db \
+	ssl/nss/server-cn-only.crt__server-password.key.db \
+	ssl/nss/server-cn-only.crt__server-cn-only.key.db \
+	ssl/nss/root.crl \
+	ssl/nss/server.crl \
+	ssl/nss/client.crl \
+	ssl/nss/server-multiple-alt-names.crt__server-multiple-alt-names.key.db \
+	ssl/nss/server-single-alt-name.crt__server-single-alt-name.key.db \
+	ssl/nss/server-cn-and-alt-names.crt__server-cn-and-alt-names.key.db \
+	ssl/nss/server-no-names.crt__server-no-names.key.db \
+	ssl/nss/server-revoked.crt__server-revoked.key.db \
+	ssl/nss/root+client.crl \
+	ssl/nss/client+client_ca.crt__client.key.db \
+	ssl/nss/client.crt__client-encrypted-pem.key.db \
+	ssl/nss/root+server_ca.crt__server.crl.db \
+	ssl/nss/root+server_ca.crt__root+server.crl.db \
+	ssl/nss/native_ca-root.db \
+	ssl/nss/native_server-root.db \
+	ssl/nss/native_client-root.db
+
 # This target re-generates all the key and certificate files. Usually we just
 # use the ones that are committed to the tree without rebuilding them.
 #
@@ -37,6 +66,10 @@ SSLFILES := $(CERTIFICATES:%=ssl/%.key) $(CERTIFICATES:%=ssl/%.crt) \
 #
 sslfiles: $(SSLFILES)
 
+# Generate NSS certificate databases corresponding to the OpenSSL certificates.
+# This target will fail unless preceded by nssfiles-clean.
+nssfiles: $(NSSFILES)
+
 # OpenSSL requires a directory to put all generated certificates in. We don't
 # use this for anything, but we need a location.
 ssl/new_certs_dir:
@@ -64,6 +97,24 @@ ssl/%_ca.crt: ssl/%_ca.key %_ca.config ssl/root_ca.crt ssl/new_certs_dir
 	rm ssl/temp_ca.crt ssl/temp_ca_signed.crt
 	echo "01" > ssl/$*_ca.srl
 
+ssl/nss/%_ca.crt.db: ssl/%_ca.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n $*_ca.crt -i ssl/$*_ca.crt -t "CT,C,C"
+
+ssl/nss/root+server_ca.crt__server.crl.db: ssl/root+server_ca.crt ssl/nss/server.crl
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	crlutil -I -i ssl/nss/server.crl -d $@ -B
+
+ssl/nss/root+server_ca.crt__root+server.crl.db: ssl/root+server_ca.crt ssl/nss/root.crl ssl/nss/server.crl
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	crlutil -I -i ssl/nss/root.crl -d $@ -B
+	crlutil -I -i ssl/nss/server.crl -d $@ -B
+
 # Server certificates, signed by server CA:
 ssl/server-%.crt: ssl/server-%.key ssl/server_ca.crt server-%.config
 	openssl req -new -key ssl/server-$*.key -out ssl/server-$*.csr -config server-$*.config
@@ -77,6 +128,79 @@ ssl/server-ss.crt: ssl/server-cn-only.key ssl/server-cn-only.crt server-cn-only.
 	openssl x509 -req -days 10000 -in ssl/server-ss.csr -signkey ssl/server-cn-only.key -out ssl/server-ss.crt  -extensions v3_req -extfile server-cn-only.config
 	rm ssl/server-ss.csr
 
+# pk12util won't preserve the password when importing the password protected
+# key, the password must be set on the database *before* importing it as the
+# password in the pkcs12 envelope will be dropped.
+ssl/nss/server-cn-only.crt__server-password.key.db: ssl/server-cn-only.crt
+	$(MKDIR_P) $@
+	echo "secret1" > password.txt
+	certutil -d "sql:$@" -N -f password.txt
+	certutil -d "sql:$@" -A -n ssl/server-cn-only.crt -i ssl/server-cn-only.crt -t "CT,C,C" -f password.txt
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C" -f password.txt
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C" -f password.txt
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C" -f password.txt
+	openssl pkcs12 -export -out ssl/nss/server-password.pfx -inkey ssl/server-password.key -in ssl/server-cn-only.crt -certfile ssl/server_ca.crt -passin 'pass:secret1' -passout 'pass:secret1'
+	pk12util -i ssl/nss/server-password.pfx -d "sql:$@" -W 'secret1' -K 'secret1'
+
+ssl/nss/server-cn-only.crt__server-cn-only.key.db: ssl/server-cn-only.crt ssl/server-cn-only.key
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-cn-only.crt -i ssl/server-cn-only.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-cn-only.pfx -inkey ssl/server-cn-only.key -in ssl/server-cn-only.crt -certfile ssl/server_ca.crt -passout pass:
+	pk12util -i ssl/nss/server-cn-only.pfx -d "sql:$@" -W ''
+
+ssl/nss/server-multiple-alt-names.crt__server-multiple-alt-names.key.db: ssl/server-multiple-alt-names.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-multiple-alt-names.crt -i ssl/server-multiple-alt-names.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-multiple-alt-names.pfx -inkey ssl/server-multiple-alt-names.key -in ssl/server-multiple-alt-names.crt -certfile ssl/server-multiple-alt-names.crt -passout pass:
+	pk12util -i ssl/nss/server-multiple-alt-names.pfx -d "sql:$@" -W ''
+
+ssl/nss/server-single-alt-name.crt__server-single-alt-name.key.db: ssl/server-single-alt-name.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-single-alt-name.crt -i ssl/server-single-alt-name.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-single-alt-name.pfx -inkey ssl/server-single-alt-name.key -in ssl/server-single-alt-name.crt -certfile ssl/server-single-alt-name.crt -passout pass:
+	pk12util -i ssl/nss/server-single-alt-name.pfx -d "sql:$@" -W ''
+
+ssl/nss/server-cn-and-alt-names.crt__server-cn-and-alt-names.key.db: ssl/server-cn-and-alt-names.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-cn-and-alt-names.crt -i ssl/server-cn-and-alt-names.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-cn-and-alt-names.pfx -inkey ssl/server-cn-and-alt-names.key -in ssl/server-cn-and-alt-names.crt -certfile ssl/server-cn-and-alt-names.crt -passout pass:
+	pk12util -i ssl/nss/server-cn-and-alt-names.pfx -d $@ -W ''
+
+ssl/nss/server-no-names.crt__server-no-names.key.db: ssl/server-no-names.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-no-names.crt -i ssl/server-no-names.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-no-names.pfx -inkey ssl/server-no-names.key -in ssl/server-no-names.crt -certfile ssl/server-no-names.crt -passout pass:
+	pk12util -i ssl/nss/server-no-names.pfx -d "sql:$@" -W ''
+
+ssl/nss/server-revoked.crt__server-revoked.key.db: ssl/server-revoked.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-revoked.crt -i ssl/server-revoked.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-revoked.pfx -inkey ssl/server-revoked.key -in ssl/server-revoked.crt -certfile ssl/server-revoked.crt -passout pass:
+	pk12util -i ssl/nss/server-revoked.pfx -d "sql:$@" -W ''
+
 # Password-protected version of server-cn-only.key
 ssl/server-password.key: ssl/server-cn-only.key
 	openssl rsa -aes256 -in $< -out $@ -passout 'pass:secret1'
@@ -88,6 +212,27 @@ ssl/client.crt: ssl/client.key ssl/client_ca.crt
 	openssl x509 -in ssl/temp.crt -out ssl/client.crt # to keep just the PEM cert
 	rm ssl/client.csr ssl/temp.crt
 
+# Client certificate, signed by client CA
+ssl/nss/client.crt__client.key.db: ssl/client.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/client.crt -i ssl/client.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root+client_ca.crt -i ssl/root+client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client.pfx -inkey ssl/client.key -in ssl/client.crt -certfile ssl/client_ca.crt -passout pass:
+	pk12util -i ssl/nss/client.pfx -d "sql:$@" -W ''
+
+# Client certificate with encrypted key, signed by client CA
+ssl/nss/client.crt__client-encrypted-pem.key.db: ssl/client.crt
+	$(MKDIR_P) $@
+	echo 'dUmmyP^#+' > $@.pass
+	certutil -d "sql:$@" -N -f $@.pass
+	certutil -d "sql:$@" -A -f $@.pass -n ssl/client.crt -i ssl/client.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -f $@.pass -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -f $@.pass -n root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client-encrypted-pem.pfx -inkey ssl/client-encrypted-pem.key -in ssl/client.crt -certfile ssl/client_ca.crt -passin pass:'dUmmyP^#+' -passout pass:'dUmmyP^#+'
+	pk12util -i ssl/nss/client-encrypted-pem.pfx -d "sql:$@" -W 'dUmmyP^#+' -k $@.pass
+
 # Another client certificate, signed by the client CA. This one is revoked.
 ssl/client-revoked.crt: ssl/client-revoked.key ssl/client_ca.crt client.config
 	openssl req -new -key ssl/client-revoked.key -out ssl/client-revoked.csr -config client.config
@@ -95,6 +240,14 @@ ssl/client-revoked.crt: ssl/client-revoked.key ssl/client_ca.crt client.config
 	openssl x509 -in ssl/temp.crt -out ssl/client-revoked.crt # to keep just the PEM cert
 	rm ssl/client-revoked.csr ssl/temp.crt
 
+ssl/nss/client-revoked.crt__client-revoked.key.db: ssl/client-revoked.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/client-revoked.crt -i ssl/client-revoked.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client-revoked.pfx -inkey ssl/client-revoked.key -in ssl/client-revoked.crt -certfile ssl/client_ca.crt -passout pass:
+	pk12util -i ssl/nss/client-revoked.pfx -d "sql:$@" -W ''
+
 # Convert the key to DER, to test our behaviour there too
 ssl/client-der.key: ssl/client.key
 	openssl rsa -in ssl/client.key -outform DER -out ssl/client-der.key
@@ -127,19 +280,40 @@ ssl/root+client_ca.crt: ssl/root_ca.crt ssl/client_ca.crt
 ssl/client+client_ca.crt: ssl/client.crt ssl/client_ca.crt
 	cat $^ > $@
 
+# Client certificate, signed by client CA
+ssl/nss/client+client_ca.crt__client.key.db: ssl/client+client_ca.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/client+client_ca.crt -i ssl/client+client_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n ssl/root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client.pfx -inkey ssl/client.key -in ssl/client.crt -certfile ssl/client_ca.crt -passout pass:
+	pk12util -i ssl/nss/client.pfx -d "sql:$@" -W ''
+
 #### CRLs
 
 ssl/client.crl: ssl/client-revoked.crt
 	openssl ca -config cas.config -name client_ca -revoke ssl/client-revoked.crt
 	openssl ca -config cas.config -name client_ca -gencrl -out ssl/client.crl
 
+ssl/nss/client.crl: ssl/client.crl
+	openssl crl -in $^ -outform der -out $@
+
 ssl/server.crl: ssl/server-revoked.crt
 	openssl ca -config cas.config -name server_ca -revoke ssl/server-revoked.crt
 	openssl ca -config cas.config -name server_ca -gencrl -out ssl/server.crl
 
+ssl/nss/server.crl: ssl/server.crl
+	openssl crl -in $^ -outform der -out $@
+
 ssl/root.crl: ssl/root_ca.crt
 	openssl ca -config cas.config -name root_ca -gencrl -out ssl/root.crl
 
+ssl/nss/root.crl: ssl/root.crl
+	openssl crl -in $^ -outform der -out $@
+
+ssl/nss/root+client.crl: ssl/root+client.crl
+	openssl crl -in $^ -outform der -out $@
+
 # If a CRL is used, OpenSSL requires a CRL file for *all* the CAs in the
 # chain, even if some of them are empty.
 ssl/root+server.crl: ssl/root.crl ssl/server.crl
@@ -147,13 +321,73 @@ ssl/root+server.crl: ssl/root.crl ssl/server.crl
 ssl/root+client.crl: ssl/root.crl ssl/client.crl
 	cat $^ > $@
 
+#### NSS specific certificates and keys
+
+#NSSFILES2 := ssl/nss/native_ca-root.db \
+#	ssl/nss/native_server-root.db \
+#	ssl/nss/native_client-root.db
+
+#nssfiles2: $(NSSFILES2)
+
+ssl/nss/native_ca-%.db:
+	$(MKDIR_P) ssl/nss/native_ca-$*.db
+	certutil -N -d "sql:ssl/nss/native_ca-$*.db/" --empty-password
+	echo y > nss_ca_params.txt
+	echo 10 >> nss_ca_params.txt
+	echo y >> nss_ca_params.txt
+	cat nss_ca_params.txt | certutil -S -d "sql:ssl/nss/native_ca-$*.db/" -n ca-$* \
+	-s "CN=Test CA for PostgreSQL SSL regression tests,OU=PostgreSQL test suite" \
+	-x -k rsa -g 2048 -m 5432 -t CTu,CTu,CTu \
+	--keyUsage certSigning -2 --nsCertType sslCA,smimeCA,objectSigningCA \
+	-z Makefile -Z SHA256
+	rm nss_ca_params.txt
+
+ssl/nss/native_ca-%.pem: ssl/nss/native_ca-%.db
+	certutil -L -d "sql:ssl/nss/native_ca-$*.db/" -n ca-$* -a > ssl/nss/native_ca-$*.pem
+
+# Create and sign a server certificate
+ssl/nss/native_server-%.db: ssl/nss/native_ca-%.pem
+	$(MKDIR_P) ssl/nss/native_server-$*.db
+	certutil -N -d "sql:ssl/nss/native_server-$*.db/" --empty-password
+	certutil -R -d "sql:ssl/nss/native_server-$*.db/" \
+		-s "CN=common-name.pg-ssltest.test,OU=PostgreSQL test suite" \
+		-o ssl/nss/native_server-$*.csr -g 2048 -Z SHA256 -z Makefile
+	echo 1 > nss_server_params.txt
+	echo 9 >> nss_server_params.txt
+	cat nss_server_params.txt | certutil -C -d "sql:ssl/nss/native_ca-$*.db/" -c ca-root -i ssl/nss/native_server-$*.csr \
+		-o ssl/nss/native_server_$*.der -m 5433 --keyUsage dataEncipherment,digitalSignature,keyEncipherment \
+		--nsCertType sslServer --certVersion 1 -Z SHA256
+	certutil -A -d "sql:ssl/nss/native_server-$*.db/" -n ca-$* -t CTu,CTu,CTu -a -i ssl/nss/native_ca-$*.pem
+	certutil -A -d "sql:ssl/nss/native_server-$*.db/" -n ssl/native_server-$*.crt -t CTu,CTu,CTu -i ssl/nss/native_server_$*.der
+	rm nss_server_params.txt
+
+# Create and sign a client certificate
+ssl/nss/native_client-%.db: ssl/nss/native_ca-%.pem
+	$(MKDIR_P) ssl/nss/native_client-$*.db
+	certutil -N -d "sql:ssl/nss/native_client-$*.db/" --empty-password
+	certutil -R -d "sql:ssl/nss/native_client-$*.db/" -s "CN=ssltestuser,OU=PostgreSQL test suite" \
+		-o ssl/nss/native_client-$*.csr -g 2048 -Z SHA256 -z Makefile
+	certutil -C -d "sql:ssl/nss/native_ca-$*.db/" -c ca-$* -i ssl/nss/native_client-$*.csr -o ssl/nss/native_client-$*.der \
+		-m 5434 --keyUsage keyEncipherment,dataEncipherment,digitalSignature --nsCertType sslClient \
+		--certVersion 1 -Z SHA256
+	certutil -A -d "sql:ssl/nss/native_client-$*.db" -n ca-$* -t CTu,CTu,CTu -a -i ssl/nss/native_ca-$*.pem
+	certutil -A -d "sql:ssl/nss/native_client-$*.db" -n native_client-$* -t CTu,CTu,CTu -i ssl/nss/native_client-$*.der
+
+nssfiles2clean:
+	rm -rf ssl/nss
+
 .PHONY: sslfiles-clean
 sslfiles-clean:
 	rm -f $(SSLFILES) ssl/client_ca.srl ssl/server_ca.srl ssl/client_ca-certindex* ssl/server_ca-certindex* ssl/root_ca-certindex* ssl/root_ca.srl ssl/temp_ca.crt ssl/temp_ca_signed.crt
 
+.PHONY: nssfiles-clean
+nssfiles-clean:
+	rm -rf ssl/nss
+
 clean distclean maintainer-clean:
 	rm -rf tmp_check
 	rm -rf ssl/*.old ssl/new_certs_dir ssl/client*_tmp.key
+	rm -rf ssl/nss
 
 # Doesn't depend on $(SSLFILES) because we don't rebuild them by default
 check:
diff --git a/src/test/ssl/t/001_ssltests.pl b/src/test/ssl/t/001_ssltests.pl
index 7928de4e7c..5a83a1d277 100644
--- a/src/test/ssl/t/001_ssltests.pl
+++ b/src/test/ssl/t/001_ssltests.pl
@@ -4,20 +4,27 @@ use PostgresNode;
 use TestLib;
 use Test::More;
 
-use File::Copy;
-
 use FindBin;
 use lib $FindBin::RealBin;
 
-use SSLServer;
+use SSL::Server;
+
+my $openssl;
+my $nss;
 
-if ($ENV{with_ssl} ne 'openssl')
+if ($ENV{with_ssl} eq 'openssl')
+{
+	$openssl = 1;
+	plan tests => 93;
+}
+elsif ($ENV{with_ssl} eq 'nss')
 {
-	plan skip_all => 'OpenSSL not supported by this build';
+	$nss = 1;
+	plan tests => 99;
 }
 else
 {
-	plan tests => 93;
+	plan skip_all => 'SSL not supported by this build';
 }
 
 #### Some configuration
@@ -32,32 +39,6 @@ my $SERVERHOSTCIDR = '127.0.0.1/32';
 # Allocation of base connection string shared among multiple tests.
 my $common_connstr;
 
-# The client's private key must not be world-readable, so take a copy
-# of the key stored in the code tree and update its permissions.
-#
-# This changes ssl/client.key to ssl/client_tmp.key etc for the rest
-# of the tests.
-my @keys = (
-	"client",     "client-revoked",
-	"client-der", "client-encrypted-pem",
-	"client-encrypted-der");
-foreach my $key (@keys)
-{
-	copy("ssl/${key}.key", "ssl/${key}_tmp.key")
-	  or die
-	  "couldn't copy ssl/${key}.key to ssl/${key}_tmp.key for permissions change: $!";
-	chmod 0600, "ssl/${key}_tmp.key"
-	  or die "failed to change permissions on ssl/${key}_tmp.key: $!";
-}
-
-# Also make a copy of that explicitly world-readable.  We can't
-# necessarily rely on the file in the source tree having those
-# permissions.  Add it to @keys to include it in the final clean
-# up phase.
-copy("ssl/client.key", "ssl/client_wrongperms_tmp.key");
-chmod 0644, "ssl/client_wrongperms_tmp.key";
-push @keys, 'client_wrongperms';
-
 #### Set up the server.
 
 note "setting up data directory";
@@ -72,36 +53,65 @@ $node->start;
 
 # Run this before we lock down access below.
 my $result = $node->safe_psql('postgres', "SHOW ssl_library");
-is($result, 'OpenSSL', 'ssl_library parameter');
+is($result, SSL::Server::ssl_library(), 'ssl_library parameter');
 
 configure_test_server_for_ssl($node, $SERVERHOSTADDR, $SERVERHOSTCIDR,
 	'trust');
 
 note "testing password-protected keys";
 
-open my $sslconf, '>', $node->data_dir . "/sslconfig.conf";
-print $sslconf "ssl=on\n";
-print $sslconf "ssl_cert_file='server-cn-only.crt'\n";
-print $sslconf "ssl_key_file='server-password.key'\n";
-print $sslconf "ssl_passphrase_command='echo wrongpassword'\n";
-close $sslconf;
+# Since the passphrase callbacks operate at different stages in OpenSSL and
+# NSS we have two separate blocks for them.
+SKIP:
+{
+	skip "Certificate passphrases aren't checked on server restart in NSS", 2
+	  if ($nss);
+
+	set_server_cert($node, 'server-cn-only', 'root+client_ca',
+					   'server-password', 'echo wrongpassword');
+	command_fails(
+		[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
+		'restart fails with password-protected key file with wrong password');
+	$node->_update_pid(0);
+
+	set_server_cert($node, 'server-cn-only', 'root+client_ca',
+					'server-password', 'echo secret1');
+	command_ok(
+		[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
+		'restart succeeds with password-protected key file');
+	$node->_update_pid(1);
+}
 
-command_fails(
-	[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
-	'restart fails with password-protected key file with wrong password');
-$node->_update_pid(0);
+SKIP:
+{
+	skip "Certificate passphrases are checked on connection in NSS", 5
+	  if ($openssl);
 
-open $sslconf, '>', $node->data_dir . "/sslconfig.conf";
-print $sslconf "ssl=on\n";
-print $sslconf "ssl_cert_file='server-cn-only.crt'\n";
-print $sslconf "ssl_key_file='server-password.key'\n";
-print $sslconf "ssl_passphrase_command='echo secret1'\n";
-close $sslconf;
+	set_server_cert($node, 'server-cn-only', 'root+client_ca',
+					   'server-password', 'echo wrongpassword');
+	command_ok(
+		[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
+		'restart fails with password-protected key file with wrong password');
+	$node->_update_pid(1);
 
-command_ok(
-	[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
-	'restart succeeds with password-protected key file');
-$node->_update_pid(1);
+	test_connect_fails(
+		"user=ssltestuser dbname=trustdb sslcert=invalid hostaddr=$SERVERHOSTADDR host=common-name.pg-ssltest.test",
+		"sslrootcert=invalid sslmode=require",
+		qr/\QSSL error\E/,
+		"connect to server with incorrect key password configured");
+
+	set_server_cert($node, 'server-cn-only', 'root+client_ca',
+					   'server-password', 'echo secret1');
+	command_ok(
+		[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
+		'restart fails with password-protected key file with wrong password');
+	$node->_update_pid(1);
+
+	test_connect_ok(
+		"user=ssltestuser dbname=trustdb sslcert=invalid hostaddr=$SERVERHOSTADDR host=common-name.pg-ssltest.test",
+		"sslrootcert=invalid sslmode=require",
+		"connect to server with correct key password configured");
+}
 
 # Test compatibility of SSL protocols.
 # TLSv1.1 is lower than TLSv1.2, so it won't work.
@@ -149,82 +159,105 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"sslrootcert=invalid sslmode=verify-ca",
-	qr/root certificate file "invalid" does not exist/,
+	qr/root certificate file "invalid" does not exist|Peer's certificate issuer has been marked as not trusted by the user/,
 	"connect without server root cert sslmode=verify-ca");
 test_connect_fails(
 	$common_connstr,
 	"sslrootcert=invalid sslmode=verify-full",
-	qr/root certificate file "invalid" does not exist/,
+	qr/root certificate file "invalid" does not exist|Peer's certificate issuer has been marked as not trusted by the user/,
 	"connect without server root cert sslmode=verify-full");
 
 # Try with wrong root cert, should fail. (We're using the client CA as the
 # root, but the server's key is signed by the server CA.)
-test_connect_fails($common_connstr,
-	"sslrootcert=ssl/client_ca.crt sslmode=require",
-	qr/SSL error/, "connect with wrong server root cert sslmode=require");
-test_connect_fails($common_connstr,
-	"sslrootcert=ssl/client_ca.crt sslmode=verify-ca",
-	qr/SSL error/, "connect with wrong server root cert sslmode=verify-ca");
-test_connect_fails($common_connstr,
-	"sslrootcert=ssl/client_ca.crt sslmode=verify-full",
-	qr/SSL error/, "connect with wrong server root cert sslmode=verify-full");
-
-# Try with just the server CA's cert. This fails because the root file
-# must contain the whole chain up to the root CA.
-test_connect_fails($common_connstr,
-	"sslrootcert=ssl/server_ca.crt sslmode=verify-ca",
-	qr/SSL error/, "connect with server CA cert, without root CA");
+test_connect_fails(
+	$common_connstr,
+	"sslrootcert=ssl/client_ca.crt sslmode=require cert_database=ssl/nss/client_ca.crt.db",
+	qr/SSL error/,
+	"connect with wrong server root cert sslmode=require");
+test_connect_fails(
+	$common_connstr,
+	"sslrootcert=ssl/client_ca.crt sslmode=verify-ca cert_database=ssl/nss/client_ca.crt.db",
+	qr/SSL error/,
+	"connect with wrong server root cert sslmode=verify-ca");
+test_connect_fails(
+	$common_connstr,
+	"sslrootcert=ssl/client_ca.crt sslmode=verify-full cert_database=ssl/nss/client_ca.crt.db",
+	qr/SSL error/,
+	"connect with wrong server root cert sslmode=verify-full");
+
+SKIP:
+{
+	# NSS supports partial chain validation, so this test doesn't work there.
+	# This is similar to the OpenSSL option X509_V_FLAG_PARTIAL_CHAIN which
+	# we don't allow.
+	skip "NSS support partial chain validation", 2 if ($nss);
+	# Try with just the server CA's cert. This fails because the root file
+	# must contain the whole chain up to the root CA.
+	test_connect_fails($common_connstr,
+		"sslrootcert=ssl/server_ca.crt sslmode=verify-ca",
+		qr/SSL error/, "connect with server CA cert, without root CA");
+}
 
 # And finally, with the correct root cert.
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require cert_database=ssl/nss/root+server_ca.crt.db",
 	"connect with correct server CA cert file sslmode=require");
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca cert_database=ssl/nss/root+server_ca.crt.db",
 	"connect with correct server CA cert file sslmode=verify-ca");
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-full",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db",
 	"connect with correct server CA cert file sslmode=verify-full");
 
-# Test with cert root file that contains two certificates. The client should
-# be able to pick the right one, regardless of the order in the file.
-test_connect_ok(
-	$common_connstr,
-	"sslrootcert=ssl/both-cas-1.crt sslmode=verify-ca",
-	"cert root file that contains two certificates, order 1");
-test_connect_ok(
-	$common_connstr,
-	"sslrootcert=ssl/both-cas-2.crt sslmode=verify-ca",
-	"cert root file that contains two certificates, order 2");
+SKIP:
+{
+	skip "CA ordering is irrelevant in NSS databases", 2 if ($nss);
 
+	# Test with cert root file that contains two certificates. The client should
+	# be able to pick the right one, regardless of the order in the file.
+	test_connect_ok(
+		$common_connstr,
+		"sslrootcert=ssl/both-cas-1.crt sslmode=verify-ca",
+		"cert root file that contains two certificates, order 1");
+
+	# How about import the both-file into a database?
+	test_connect_ok(
+		$common_connstr,
+		"sslrootcert=ssl/both-cas-2.crt sslmode=verify-ca",
+		"cert root file that contains two certificates, order 2");
+}
 # CRL tests
 
 # Invalid CRL filename is the same as no CRL, succeeds
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=invalid",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=invalid cert_database=ssl/nss/root+server_ca.crt.db",
 	"sslcrl option with invalid file name");
 
-# A CRL belonging to a different CA is not accepted, fails
-test_connect_fails(
-	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/client.crl",
-	qr/SSL error/,
-	"CRL belonging to a different CA");
+SKIP:
+{
+	skip "CRL's are verified when adding to NSS database", 2 if ($nss);
+	# A CRL belonging to a different CA is not accepted, fails
+	test_connect_fails(
+		$common_connstr,
+		"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/client.crl",
+		qr/SSL error/,
+		"CRL belonging to a different CA");
+}
 
 # With the correct CRL, succeeds (this cert is not revoked)
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/root+server.crl",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/root+server.crl cert_database=ssl/nss/root+server_ca.crt__root+server.crl.db",
 	"CRL with a non-revoked cert");
 
 # Check that connecting with verify-full fails, when the hostname doesn't
 # match the hostname in the server's certificate.
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -237,14 +270,14 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"sslmode=verify-full host=wronghost.test",
-	qr/\Qserver certificate for "common-name.pg-ssltest.test" does not match host name "wronghost.test"\E/,
+	qr/\Qserver certificate for "common-name.pg-ssltest.test" does not match host name "wronghost.test"\E|requested domain name does not match the server's certificate/,
 	"mismatch between host name and server certificate sslmode=verify-full");
 
 # Test Subject Alternative Names.
 switch_server_cert($node, 'server-multiple-alt-names');
 
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -262,12 +295,12 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"host=wronghost.alt-name.pg-ssltest.test",
-	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "wronghost.alt-name.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "wronghost.alt-name.pg-ssltest.test"\E|requested domain name does not match the server's certificate/,
 	"host name not matching with X.509 Subject Alternative Names");
 test_connect_fails(
 	$common_connstr,
 	"host=deep.subdomain.wildcard.pg-ssltest.test",
-	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E|requested domain name does not match the server's certificate/,
 	"host name not matching with X.509 Subject Alternative Names wildcard");
 
 # Test certificate with a single Subject Alternative Name. (this gives a
@@ -275,7 +308,7 @@ test_connect_fails(
 switch_server_cert($node, 'server-single-alt-name');
 
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -285,12 +318,12 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"host=wronghost.alt-name.pg-ssltest.test",
-	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "wronghost.alt-name.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "wronghost.alt-name.pg-ssltest.test"\E|requested domain name does not match the server's certificate/,
 	"host name not matching with a single X.509 Subject Alternative Name");
 test_connect_fails(
 	$common_connstr,
 	"host=deep.subdomain.wildcard.pg-ssltest.test",
-	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E|requested domain name does not match the server's certificate/,
 	"host name not matching with a single X.509 Subject Alternative Name wildcard"
 );
 
@@ -299,7 +332,7 @@ test_connect_fails(
 switch_server_cert($node, 'server-cn-and-alt-names');
 
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -312,14 +345,14 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"host=common-name.pg-ssltest.test",
-	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 1 other name) does not match host name "common-name.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 1 other name) does not match host name "common-name.pg-ssltest.test"\E|requested domain name does not match the server's certificate/,
 	"certificate with both a CN and SANs ignores CN");
 
 # Finally, test a server certificate that has no CN or SANs. Of course, that's
 # not a very sensible certificate, but libpq should handle it gracefully.
 switch_server_cert($node, 'server-no-names');
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -328,7 +361,7 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"sslmode=verify-full host=common-name.pg-ssltest.test",
-	qr/could not get server's host name from server certificate/,
+	qr/could not get server's host name from server certificate|requested domain name does not match the server's certificate./,
 	"server certificate without CN or SANs sslmode=verify-full");
 
 # Test that the CRL works
@@ -340,11 +373,11 @@ $common_connstr =
 # Without the CRL, succeeds. With it, fails.
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca cert_database=ssl/nss/root+server_ca.crt.db",
 	"connects without client-side CRL");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/root+server.crl",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/server.crl cert_database=ssl/nss/root+server_ca.crt__server.crl.db",
 	qr/SSL error/,
 	"does not connect with client-side CRL");
 
@@ -365,32 +398,50 @@ command_like(
 # Test min/max SSL protocol versions.
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.2",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.2 cert_database=ssl/nss/root+server_ca.crt.db",
 	"connection success with correct range of TLS protocol versions");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.1",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.1 cert_database=ssl/nss/root+server_ca.crt.db",
 	qr/invalid SSL protocol version range/,
 	"connection failure with incorrect range of TLS protocol versions");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=incorrect_tls",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=incorrect_tls cert_database=ssl/nss/root+server_ca.crt.db",
 	qr/invalid ssl_min_protocol_version value/,
 	"connection failure with an incorrect SSL protocol minimum bound");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_max_protocol_version=incorrect_tls",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_max_protocol_version=incorrect_tls cert_database=ssl/nss/root+server_ca.crt.db",
 	qr/invalid ssl_max_protocol_version value/,
 	"connection failure with an incorrect SSL protocol maximum bound");
 
+# tests of NSS generated certificates/keys
+SKIP:
+{
+	skip "NSS specific tests",            1 if ($openssl);
+
+	switch_server_cert($node, 'native_server-root', 'native_ca-root');
+	$common_connstr =
+	  "user=ssltestuser dbname=trustdb hostaddr=$SERVERHOSTADDR host=common-name.pg-ssltest.test";
+
+	test_connect_ok(
+		$common_connstr,
+		"sslmode=require user=ssltestuser",
+		"NSS generated certificates"
+	);
+}
+
 ### Server-side tests.
 ###
 ### Test certificate authorization.
 
+switch_server_cert($node, 'server-revoked');
+
 note "running server tests";
 
 $common_connstr =
-  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR";
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client.crt__client.key.db";
 
 # no client cert
 test_connect_fails(
@@ -406,32 +457,43 @@ test_connect_ok(
 	"certificate authorization succeeds with correct client cert in PEM format"
 );
 
-# correct client cert in unencrypted DER
-test_connect_ok(
-	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-der_tmp.key",
-	"certificate authorization succeeds with correct client cert in DER format"
-);
+$common_connstr =
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR";
+
+SKIP:
+{
+	skip "NSS database not implemented in the Makefile", 1 if ($nss);
+	# correct client cert in unencrypted DER
+	test_connect_ok(
+		$common_connstr,
+		"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-der_tmp.key",
+		"certificate authorization succeeds with correct client cert in DER format"
+	);
+}
 
 # correct client cert in encrypted PEM
 test_connect_ok(
 	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='dUmmyP^#+'",
+	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='dUmmyP^#+' cert_database=ssl/nss/client.crt__client-encrypted-pem.key.db",
 	"certificate authorization succeeds with correct client cert in encrypted PEM format"
 );
 
-# correct client cert in encrypted DER
-test_connect_ok(
-	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-der_tmp.key sslpassword='dUmmyP^#+'",
-	"certificate authorization succeeds with correct client cert in encrypted DER format"
-);
+SKIP:
+{
+	skip "NSS database not implemented in the Makefile", 1 if ($nss);
+	# correct client cert in encrypted DER
+	test_connect_ok(
+		$common_connstr,
+		"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-der_tmp.key sslpassword='dUmmyP^#+'",
+		"certificate authorization succeeds with correct client cert in encrypted DER format"
+	);
+}
 
 # correct client cert in encrypted PEM with wrong password
 test_connect_fails(
 	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='wrong'",
-	qr!\Qprivate key file "ssl/client-encrypted-pem_tmp.key": bad decrypt\E!,
+	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='wrong' cert_database=ssl/nss/client.crt__client-encrypted-pem.key.db",
+	qr!connection requires a valid client certificate|\Qprivate key file "ssl/client-encrypted-pem_tmp.key": bad decrypt\E!,
 	"certificate authorization fails with correct client cert and wrong password in encrypted PEM format"
 );
 
@@ -471,18 +533,19 @@ command_like(
 		'-P',
 		'null=_null_',
 		'-d',
-		"$common_connstr user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client_tmp.key",
+		"$common_connstr user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client_tmp.key cert_database=ssl/nss/client.crt__client.key.db",
 		'-c',
 		"SELECT * FROM pg_stat_ssl WHERE pid = pg_backend_pid()"
 	],
 	qr{^pid,ssl,version,cipher,bits,compression,client_dn,client_serial,issuer_dn\r?\n
-				^\d+,t,TLSv[\d.]+,[\w-]+,\d+,f,/CN=ssltestuser,1,\Q/CN=Test CA for PostgreSQL SSL regression test client certs\E\r?$}mx,
+				^\d+,t,TLSv[\d.]+,[\w-]+,\d+,f,/?CN=ssltestuser,1,/?\QCN=Test CA for PostgreSQL SSL regression test client certs\E\r?$}mx,
 	'pg_stat_ssl with client certificate');
 
 # client key with wrong permissions
 SKIP:
 {
 	skip "Permissions check not enforced on Windows", 2 if ($windows_os);
+	skip "Key not on filesystem with NSS",            2 if ($nss);
 
 	test_connect_fails(
 		$common_connstr,
@@ -495,10 +558,13 @@ SKIP:
 test_connect_fails(
 	$common_connstr,
 	"user=anotheruser sslcert=ssl/client.crt sslkey=ssl/client_tmp.key",
-	qr/certificate authentication failed for user "anotheruser"/,
+	qr/unable to verify certificate|certificate authentication failed for user "anotheruser"/,
 	"certificate authorization fails with client cert belonging to another user"
 );
 
+$common_connstr =
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client-revoked.crt__client-revoked.key.db";
+
 # revoked client cert
 test_connect_fails(
 	$common_connstr,
@@ -510,7 +576,7 @@ test_connect_fails(
 # works, iff username matches Common Name
 # fails, iff username doesn't match Common Name.
 $common_connstr =
-  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=verifydb hostaddr=$SERVERHOSTADDR";
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=verifydb hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client.crt__client.key.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -536,17 +602,19 @@ test_connect_ok(
 # intermediate client_ca.crt is provided by client, and isn't in server's ssl_ca_file
 switch_server_cert($node, 'server-cn-only', 'root_ca');
 $common_connstr =
-  "user=ssltestuser dbname=certdb sslkey=ssl/client_tmp.key sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR";
+  "user=ssltestuser dbname=certdb sslkey=ssl/client_tmp.key sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client+client_ca.crt__client.key.db";
 
 test_connect_ok(
 	$common_connstr,
 	"sslmode=require sslcert=ssl/client+client_ca.crt",
 	"intermediate client certificate is provided by client");
-test_connect_fails($common_connstr, "sslmode=require sslcert=ssl/client.crt",
-	qr/SSL error/, "intermediate client certificate is missing");
+
+test_connect_fails(
+	$common_connstr,
+	"sslmode=require sslcert=ssl/client.crt",
+	qr/connection requires a valid client certificate|SSL error/,
+	"intermediate client certificate is missing");
 
 # clean up
-foreach my $key (@keys)
-{
-	unlink("ssl/${key}_tmp.key");
-}
+
+SSL::Server::cleanup();
diff --git a/src/test/ssl/t/002_scram.pl b/src/test/ssl/t/002_scram.pl
index 410b9e910d..43565bdf6e 100644
--- a/src/test/ssl/t/002_scram.pl
+++ b/src/test/ssl/t/002_scram.pl
@@ -11,11 +11,30 @@ use File::Copy;
 use FindBin;
 use lib $FindBin::RealBin;
 
-use SSLServer;
+use SSL::Server;
 
-if ($ENV{with_ssl} ne 'openssl')
+my $openssl;
+my $nss;
+
+my $supports_tls_server_end_point;
+
+if ($ENV{with_ssl} eq 'openssl')
+{
+	$openssl = 1;
+	# Determine whether build supports tls-server-end-point.
+	$supports_tls_server_end_point =
+		check_pg_config("#define HAVE_X509_GET_SIGNATURE_NID 1");
+	plan tests => $supports_tls_server_end_point ? 9 : 10;
+}
+elsif ($ENV{with_ssl} eq 'nss')
+{
+	$nss = 1;
+	$supports_tls_server_end_point = 1;
+	plan tests => 9;
+}
+else
 {
-	plan skip_all => 'OpenSSL not supported by this build';
+	plan skip_all => 'SSL not supported by this build';
 }
 
 # This is the hostname used to connect to the server.
@@ -23,12 +42,6 @@ my $SERVERHOSTADDR = '127.0.0.1';
 # This is the pattern to use in pg_hba.conf to match incoming connections.
 my $SERVERHOSTCIDR = '127.0.0.1/32';
 
-# Determine whether build supports tls-server-end-point.
-my $supports_tls_server_end_point =
-  check_pg_config("#define HAVE_X509_GET_SIGNATURE_NID 1");
-
-my $number_of_tests = $supports_tls_server_end_point ? 9 : 10;
-
 # Allocation of base connection string shared among multiple tests.
 my $common_connstr;
 
@@ -66,6 +79,7 @@ test_connect_ok(
 	$common_connstr,
 	"user=ssltestuser channel_binding=disable",
 	"SCRAM with SSL and channel_binding=disable");
+
 if ($supports_tls_server_end_point)
 {
 	test_connect_ok(
@@ -97,12 +111,9 @@ my $client_tmp_key = "ssl/client_scram_tmp.key";
 copy("ssl/client.key", $client_tmp_key);
 chmod 0600, $client_tmp_key;
 test_connect_fails(
-	"sslcert=ssl/client.crt sslkey=$client_tmp_key sslrootcert=invalid hostaddr=$SERVERHOSTADDR",
+	"sslcert=ssl/client.crt sslkey=$client_tmp_key sslrootcert=invalid hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client.crt__client.key.db",
 	"dbname=certdb user=ssltestuser channel_binding=require",
 	qr/channel binding required, but server authenticated client without channel binding/,
 	"Cert authentication and channel_binding=require");
-
 # clean up
 unlink($client_tmp_key);
-
-done_testing($number_of_tests);
diff --git a/src/test/ssl/t/SSL/Backend/NSS.pm b/src/test/ssl/t/SSL/Backend/NSS.pm
new file mode 100644
index 0000000000..c5b31e584a
--- /dev/null
+++ b/src/test/ssl/t/SSL/Backend/NSS.pm
@@ -0,0 +1,73 @@
+package SSL::Backend::NSS;
+
+use strict;
+use warnings;
+use Exporter;
+
+our @ISA       = qw(Exporter);
+our @EXPORT_OK = qw(get_new_nss_backend);
+
+sub new
+{
+	my ($class) = @_;
+
+	my $self = { _library => 'NSS' };
+
+	bless $self, $class;
+
+	return $self;
+}
+
+sub get_new_nss_backend
+{
+	my $class = 'SSL::Backend::NSS';
+
+	return $class->new();
+}
+
+sub init
+{
+	# Make sure the certificate databases are in place?
+}
+
+sub get_library
+{
+	my ($self) = @_;
+
+	return $self->{_library};
+}
+
+sub set_server_cert
+{
+	my $self     = $_[0];
+	my $certfile = $_[1];
+	my $cafile   = $_[2];
+	my $keyfile  = $_[3];
+
+	my $cert_nickname;
+
+	if ($certfile =~ /native/)
+	{
+		$cert_nickname = $certfile;
+	}
+	else
+	{
+		$cert_nickname = $certfile . '.crt__' . $keyfile . '.key';
+	}
+	my $cert_database = $cert_nickname . '.db';
+
+	my $sslconf =
+	    "ssl_ca_file='$cafile.crt'\n"
+	  . "ssl_cert_file='ssl/$certfile.crt'\n"
+	  . "ssl_crl_file=''\n"
+	  . "ssl_database='nss/$cert_database'\n";
+
+	return $sslconf;
+}
+
+sub cleanup
+{
+	# Something?
+}
+
+1;
diff --git a/src/test/ssl/t/SSL/Backend/OpenSSL.pm b/src/test/ssl/t/SSL/Backend/OpenSSL.pm
new file mode 100644
index 0000000000..62b11b7632
--- /dev/null
+++ b/src/test/ssl/t/SSL/Backend/OpenSSL.pm
@@ -0,0 +1,103 @@
+package SSL::Backend::OpenSSL;
+
+use strict;
+use warnings;
+use Exporter;
+use File::Copy;
+
+our @ISA       = qw(Exporter);
+our @EXPORT_OK = qw(get_new_openssl_backend);
+
+our (@keys);
+
+INIT
+{
+	@keys = (
+		"client",     "client-revoked",
+		"client-der", "client-encrypted-pem",
+		"client-encrypted-der");
+}
+
+sub new
+{
+	my ($class) = @_;
+
+	my $self = { _library => 'OpenSSL' };
+
+	bless $self, $class;
+
+	return $self;
+}
+
+sub get_new_openssl_backend
+{
+	my $class = 'SSL::Backend::OpenSSL';
+
+	my $backend = $class->new();
+
+	return $backend;
+}
+
+sub init
+{
+	# The client's private key must not be world-readable, so take a copy
+	# of the key stored in the code tree and update its permissions.
+	#
+	# This changes ssl/client.key to ssl/client_tmp.key etc for the rest
+	# of the tests.
+	foreach my $key (@keys)
+	{
+		copy("ssl/${key}.key", "ssl/${key}_tmp.key")
+		  or die
+		  "couldn't copy ssl/${key}.key to ssl/${key}_tmp.key for permissions change: $!";
+		chmod 0600, "ssl/${key}_tmp.key"
+		  or die "failed to change permissions on ssl/${key}_tmp.key: $!";
+	}
+
+	# Also make a copy of that explicitly world-readable.  We can't
+	# necessarily rely on the file in the source tree having those
+	# permissions. Add it to @keys to include it in the final clean
+	# up phase.
+	copy("ssl/client.key", "ssl/client_wrongperms_tmp.key")
+	  or die
+	  "couldn't copy ssl/client.key to ssl/client_wrongperms_tmp.key: $!";
+	chmod 0644, "ssl/client_wrongperms_tmp.key"
+	  or die
+	  "failed to change permissions on ssl/client_wrongperms_tmp.key: $!";
+	push @keys, 'client_wrongperms';
+}
+
+# Change the configuration to use given server cert file, and reload
+# the server so that the configuration takes effect.
+sub set_server_cert
+{
+	my $self     = $_[0];
+	my $certfile = $_[1];
+	my $cafile   = $_[2] || "root+client_ca";
+	my $keyfile  = $_[3] || $certfile;
+
+	my $sslconf =
+	    "ssl_ca_file='$cafile.crt'\n"
+	  . "ssl_cert_file='$certfile.crt'\n"
+	  . "ssl_key_file='$keyfile.key'\n"
+	  . "ssl_crl_file='root+client.crl'\n";
+
+	return $sslconf;
+}
+
+sub get_library
+{
+	my ($self) = @_;
+
+	return $self->{_library};
+}
+
+sub cleanup
+{
+	foreach my $key (@keys)
+	{
+		unlink("ssl/${key}_tmp.key");
+	}
+}
+
+1;
diff --git a/src/test/ssl/t/SSLServer.pm b/src/test/ssl/t/SSL/Server.pm
similarity index 78%
rename from src/test/ssl/t/SSLServer.pm
rename to src/test/ssl/t/SSL/Server.pm
index f5987a003e..ee901855b5 100644
--- a/src/test/ssl/t/SSLServer.pm
+++ b/src/test/ssl/t/SSL/Server.pm
@@ -23,19 +23,39 @@
 # explicitly because an invalid sslcert or sslrootcert, respectively,
 # causes those to be ignored.)
 
-package SSLServer;
+package SSL::Server;
 
 use strict;
 use warnings;
 use PostgresNode;
+use RecursiveCopy;
 use TestLib;
 use File::Basename;
 use File::Copy;
 use Test::More;
+use SSL::Backend::OpenSSL qw(get_new_openssl_backend);
+use SSL::Backend::NSS qw(get_new_nss_backend);
+
+our ($openssl, $nss, $backend);
+
+# The TLS backend which the server is using should be mostly transparent for
+# the user, apart from individual configuration settings, so keep the backend
+# specific things abstracted behind SSL::Server.
+if ($ENV{with_ssl} eq 'openssl')
+{
+	$backend = get_new_openssl_backend();
+	$openssl = 1;
+}
+elsif ($ENV{with_ssl} eq 'nss')
+{
+	$backend = get_new_nss_backend();
+	$nss     = 1;
+}
 
 use Exporter 'import';
 our @EXPORT = qw(
   configure_test_server_for_ssl
+  set_server_cert
   switch_server_cert
   test_connect_fails
   test_connect_ok
@@ -144,12 +164,19 @@ sub configure_test_server_for_ssl
 	close $sslconf;
 
 	# Copy all server certificates and keys, and client root cert, to the data dir
-	copy_files("ssl/server-*.crt", $pgdata);
-	copy_files("ssl/server-*.key", $pgdata);
-	chmod(0600, glob "$pgdata/server-*.key") or die $!;
-	copy_files("ssl/root+client_ca.crt", $pgdata);
-	copy_files("ssl/root_ca.crt",        $pgdata);
-	copy_files("ssl/root+client.crl",    $pgdata);
+	if (defined($openssl))
+	{
+		copy_files("ssl/server-*.crt", $pgdata);
+		copy_files("ssl/server-*.key", $pgdata);
+		chmod(0600, glob "$pgdata/server-*.key") or die $!;
+		copy_files("ssl/root+client_ca.crt", $pgdata);
+		copy_files("ssl/root_ca.crt",        $pgdata);
+		copy_files("ssl/root+client.crl",    $pgdata);
+	}
+	elsif (defined($nss))
+	{
+		RecursiveCopy::copypath("ssl/nss", $pgdata . "/nss") if -e "ssl/nss";
+	}
 
 	# Stop and restart server to load new listen_addresses.
 	$node->restart;
@@ -157,26 +184,51 @@ sub configure_test_server_for_ssl
 	# Change pg_hba after restart because hostssl requires ssl=on
 	configure_hba_for_ssl($node, $servercidr, $authmethod);
 
+	# Finally, perform backend specific configuration
+	$backend->init();
+
 	return;
 }
 
-# Change the configuration to use given server cert file, and reload
-# the server so that the configuration takes effect.
-sub switch_server_cert
+sub ssl_library
+{
+	return $backend->get_library();
+}
+
+sub cleanup
+{
+	$backend->cleanup();
+}
+
+# Change the configuration to use given server cert file,
+sub set_server_cert
 {
 	my $node     = $_[0];
 	my $certfile = $_[1];
 	my $cafile   = $_[2] || "root+client_ca";
+	my $keyfile  = $_[3] || '';
+	my $pwcmd    = $_[4] || '';
 	my $pgdata   = $node->data_dir;
 
+	$keyfile = $certfile if $keyfile eq '';
+
 	open my $sslconf, '>', "$pgdata/sslconfig.conf";
 	print $sslconf "ssl=on\n";
-	print $sslconf "ssl_ca_file='$cafile.crt'\n";
-	print $sslconf "ssl_cert_file='$certfile.crt'\n";
-	print $sslconf "ssl_key_file='$certfile.key'\n";
-	print $sslconf "ssl_crl_file='root+client.crl'\n";
+	print $sslconf $backend->set_server_cert($certfile, $cafile, $keyfile);
+	print $sslconf "ssl_passphrase_command='$pwcmd'\n"
+	  unless $pwcmd eq '';
 	close $sslconf;
+	return;
+}
 
+# Change the configuration to use given server cert file, and reload
+# the server so that the configuration takes effect.
+# Takes the same arguments as set_server_cert, which it calls to do that
+# piece of the work.
+sub switch_server_cert
+{
+	my $node = $_[0];
+	set_server_cert(@_);
 	$node->restart;
 	return;
 }
-- 
2.25.1

From 61ebfcf1ab77a3e1b730601a8fa418353dc432ab Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Wed, 28 Oct 2020 11:24:02 +0100
Subject: [PATCH v25 3/6] NSS pg_strong_random support

---
 configure                   |  1 +
 configure.ac                |  1 +
 src/include/pg_config.h.in  |  3 +++
 src/port/pg_strong_random.c | 50 ++++++++++++++++++++++++++++++++++++-
 4 files changed, 54 insertions(+), 1 deletion(-)

diff --git a/configure b/configure
index 143726c79c..2b83914289 100755
--- a/configure
+++ b/configure
@@ -18422,6 +18422,7 @@ $as_echo "NSS" >&6; }
 elif test x"$PORTNAME" = x"win32" ; then
   { $as_echo "$as_me:${as_lineno-$LINENO}: result: Windows native" >&5
 $as_echo "Windows native" >&6; }
+
 else
   { $as_echo "$as_me:${as_lineno-$LINENO}: result: /dev/urandom" >&5
 $as_echo "/dev/urandom" >&6; }
diff --git a/configure.ac b/configure.ac
index 59657a6010..6533e10ffd 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2197,6 +2197,7 @@ elif test x"$with_ssl" = x"nss" ; then
   AC_MSG_RESULT([NSS])
 elif test x"$PORTNAME" = x"win32" ; then
   AC_MSG_RESULT([Windows native])
+
 else
   AC_MSG_RESULT([/dev/urandom])
   AC_CHECK_FILE([/dev/urandom], [], [])
diff --git a/src/include/pg_config.h.in b/src/include/pg_config.h.in
index 8856a33590..fa5a977617 100644
--- a/src/include/pg_config.h.in
+++ b/src/include/pg_config.h.in
@@ -908,6 +908,9 @@
 /* Define to build with NSS support (--with-ssl=nss) */
 #undef USE_NSS
 
+/* Define to use NSS for random number generation */
+#undef USE_NSS_RANDOM
+
 /* Define to 1 to use software CRC-32C implementation (slicing-by-8). */
 #undef USE_SLICING_BY_8_CRC32C
 
diff --git a/src/port/pg_strong_random.c b/src/port/pg_strong_random.c
index 07f24c0089..40de237628 100644
--- a/src/port/pg_strong_random.c
+++ b/src/port/pg_strong_random.c
@@ -137,7 +137,55 @@ pg_strong_random(void *buf, size_t len)
 	return false;
 }
 
-#else							/* not USE_OPENSSL or WIN32 */
+#elif defined(USE_NSS)
+
+#define pg_BITS_PER_BYTE BITS_PER_BYTE
+#undef BITS_PER_BYTE
+#define NO_NSPR_10_SUPPORT
+#include <nss/nss.h>
+#include <nss/pk11pub.h>
+#if defined(BITS_PER_BYTE)
+#if BITS_PER_BYTE != pg_BITS_PER_BYTE
+#error "incompatible byte widths between NSPR and postgres"
+#endif
+#else
+#define BITS_PER_BYTE pg_BITS_PER_BYTE
+#endif
+#undef pg_BITS_PER_BYTE
+
+void
+pg_strong_random_init(void)
+{
+	/* No initialization needed on NSS */
+}
+
+bool
+pg_strong_random(void *buf, size_t len)
+{
+	NSSInitParameters params;
+	NSSInitContext *nss_context;
+	SECStatus	status;
+
+	memset(&params, 0, sizeof(params));
+	params.length = sizeof(params);
+	nss_context = NSS_InitContext("", "", "", "", &params,
+								  NSS_INIT_READONLY | NSS_INIT_NOCERTDB |
+								  NSS_INIT_NOMODDB | NSS_INIT_FORCEOPEN |
+								  NSS_INIT_NOROOTINIT | NSS_INIT_PK11RELOAD);
+
+	if (!nss_context)
+		return false;
+
+	status = PK11_GenerateRandom(buf, len);
+	NSS_ShutdownContext(nss_context);
+
+	if (status == SECSuccess)
+		return true;
+
+	return false;
+}
+
+#else							/* not USE_OPENSSL, USE_NSS or WIN32 */
 
 /*
  * Without OpenSSL or Win32 support, just read /dev/urandom ourselves.
-- 
2.25.1

From 6c23c72132419ed880793383e3efbf294ab4e218 Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Wed, 28 Oct 2020 11:26:31 +0100
Subject: [PATCH v25 4/6] NSS Documentation

---
 doc/src/sgml/acronyms.sgml     |  43 ++++++++++++
 doc/src/sgml/config.sgml       |  28 +++++++-
 doc/src/sgml/installation.sgml |  31 ++++++---
 doc/src/sgml/libpq.sgml        |  99 +++++++++++++++++++++++++-
 doc/src/sgml/runtime.sgml      | 123 +++++++++++++++++++++++++++++++--
 5 files changed, 305 insertions(+), 19 deletions(-)

diff --git a/doc/src/sgml/acronyms.sgml b/doc/src/sgml/acronyms.sgml
index 4e5ec983c0..7b02c8a622 100644
--- a/doc/src/sgml/acronyms.sgml
+++ b/doc/src/sgml/acronyms.sgml
@@ -441,6 +441,28 @@
     </listitem>
    </varlistentry>
 
+   <varlistentry>
+    <term><acronym>NSPR</acronym></term>
+    <listitem>
+     <para>
+      <ulink
+      url="https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSPR">
+      Netscape Portable Runtime</ulink>
+     </para>
+    </listitem>
+   </varlistentry>
+
+   <varlistentry>
+    <term><acronym>NSS</acronym></term>
+    <listitem>
+     <para>
+      <ulink
+      url="https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS">
+      Network Security Services</ulink>
+     </para>
+    </listitem>
+   </varlistentry>
+
    <varlistentry>
     <term><acronym>ODBC</acronym></term>
     <listitem>
@@ -539,6 +561,17 @@
     </listitem>
    </varlistentry>
 
+   <varlistentry>
+    <term><acronym>PKCS#12</acronym></term>
+    <listitem>
+     <para>
+      <ulink
+      url="https://en.wikipedia.org/wiki/PKCS_12">
+      Public-Key Cryptography Standards #12</ulink>
+     </para>
+    </listitem>
+   </varlistentry>
+
    <varlistentry>
     <term><acronym>PL</acronym></term>
     <listitem>
@@ -684,6 +717,16 @@
     </listitem>
    </varlistentry>
 
+   <varlistentry>
+    <term><acronym>TLS</acronym></term>
+    <listitem>
+     <para>
+      <ulink url="https://en.wikipedia.org/wiki/Transport_Layer_Security">
+      Transport Layer Security</ulink>
+     </para>
+    </listitem>
+   </varlistentry>
+
    <varlistentry>
     <term><acronym>TOAST</acronym></term>
     <listitem>
diff --git a/doc/src/sgml/config.sgml b/doc/src/sgml/config.sgml
index e17cdcc816..b33cffb370 100644
--- a/doc/src/sgml/config.sgml
+++ b/doc/src/sgml/config.sgml
@@ -1238,6 +1238,23 @@ include_dir 'conf.d'
       </listitem>
      </varlistentry>
 
+     <varlistentry id="guc-ssl-database" xreflabel="ssl_database">
+      <term><varname>ssl_database</varname> (<type>string</type>)
+      <indexterm>
+       <primary><varname>ssl_database</varname> configuration parameter</primary>
+      </indexterm>
+      </term>
+      <listitem>
+       <para>
+        Specifies the name of the file containing the server certificates and
+        keys when using <productname>NSS</productname> for <acronym>SSL</acronym>
+        connections. This parameter can only be set in the
+        <filename>postgresql.conf</filename> file or on the server command
+        line.
+       </para>
+      </listitem>
+     </varlistentry>
+
      <varlistentry id="guc-ssl-ciphers" xreflabel="ssl_ciphers">
       <term><varname>ssl_ciphers</varname> (<type>string</type>)
       <indexterm>
@@ -1254,7 +1271,9 @@ include_dir 'conf.d'
         connections using TLS version 1.2 and lower are affected.  There is
         currently no setting that controls the cipher choices used by TLS
         version 1.3 connections.  The default value is
-        <literal>HIGH:MEDIUM:+3DES:!aNULL</literal>.  The default is usually a
+        <literal>HIGH:MEDIUM:+3DES:!aNULL</literal> for servers which have
+        been built with <productname>OpenSSL</productname> as the
+        <acronym>SSL</acronym> library.  The default is usually a
         reasonable choice unless you have specific security requirements.
        </para>
 
@@ -1456,8 +1475,11 @@ include_dir 'conf.d'
        <para>
         Sets an external command to be invoked when a passphrase for
         decrypting an SSL file such as a private key needs to be obtained.  By
-        default, this parameter is empty, which means the built-in prompting
-        mechanism is used.
+        default, this parameter is empty. When the server is using
+        <productname>OpenSSL</productname>, this means the built-in prompting
+        mechanism is used. When using <productname>NSS</productname>, there is
+        no default prompting so a blank callback will be used returning an
+        empty password.
        </para>
        <para>
         The command must print the passphrase to the standard output and exit
diff --git a/doc/src/sgml/installation.sgml b/doc/src/sgml/installation.sgml
index 66ad4ba938..1b71881c6e 100644
--- a/doc/src/sgml/installation.sgml
+++ b/doc/src/sgml/installation.sgml
@@ -976,15 +976,30 @@ build-postgresql:
        <listitem>
         <para>
          Build with support for <acronym>SSL</acronym> (encrypted)
-         connections. The only <replaceable>LIBRARY</replaceable>
-         supported is <option>openssl</option>. This requires the
-         <productname>OpenSSL</productname> package to be installed.
-         <filename>configure</filename> will check for the required
-         header files and libraries to make sure that your
-         <productname>OpenSSL</productname> installation is sufficient
-         before proceeding. 
+         connections. <replaceable>LIBRARY</replaceable> must be one of:
         </para>
-       </listitem>
+        <itemizedlist>
+         <listitem>
+          <para>
+           <option>openssl</option> to build with <productname>OpenSSL</productname> support.
+            This requires the <productname>OpenSSL</productname>
+            package to be installed.  <filename>configure</filename> will check
+            for the required header files and libraries to make sure that
+            your <productname>OpenSSL</productname> installation is sufficient
+            before proceeding.
+          </para>
+         </listitem>
+         <listitem>
+          <para>
+           <option>nss</option> to build with <productname>libnss</productname> support.
+            This requires the <productname>NSS</productname> package to be installed. Additionally,
+            <productname>NSS</productname> requires <productname>NSPR</productname>
+            to be installed. <filename>configure</filename> will check for the
+            required header files and libraries to make sure that your
+            <productname>NSS</productname> installation is sufficient before
+            proceeding.
+          </para>
+         </listitem>
       </varlistentry>
 
       <varlistentry>
diff --git a/doc/src/sgml/libpq.sgml b/doc/src/sgml/libpq.sgml
index b7a82453f0..89796de168 100644
--- a/doc/src/sgml/libpq.sgml
+++ b/doc/src/sgml/libpq.sgml
@@ -830,6 +830,12 @@ int callback_fn(char *buf, int size, PGconn *conn);
        <function>longjmp(...)</function>, etc. It must return normally.
       </para>
 
+      <para>
+        <function>PQsetSSLKeyPassHook_OpenSSL</function> is only available
+        when the server was compiled with <productname>OpenSSL</productname>
+        support.
+      </para>
+
      </listitem>
     </varlistentry>
 
@@ -846,6 +852,72 @@ PQsslKeyPassHook_OpenSSL_type PQgetSSLKeyPassHook_OpenSSL(void);
 </synopsis>
       </para>
 
+      <para>
+        <function>PQgetSSLKeyPassHook_OpenSSL</function> is only available
+        when the server was compiled with <productname>OpenSSL</productname>
+        support.
+      </para>
+
+     </listitem>
+    </varlistentry>
+
+    <varlistentry id="libpq-pqsetsslkeypasshook-nss">
+     <term><function>PQsetSSLKeyPassHook_nss</function><indexterm><primary>PQsetSSLKeyPassHook_nss</primary></indexterm></term>
+     <listitem>
+      <para>
+       <function>PQsetSSLKeyPassHook_nss</function> lets an application override
+       <application>libpq</application>'s default handling of password protected
+       objects in the <application>NSS</application> database using
+       <xref linkend="libpq-connect-sslpassword"/> or interactive prompting.
+
+<synopsis>
+void PQsetSSLKeyPassHook_nss(PQsslKeyPassHook_nss_type hook);
+</synopsis>
+
+       The application passes a pointer to a callback function with signature:
+<programlisting>
+char *callback_fn(PK11SlotInfo *slot, PRBool retry, void *arg);
+</programlisting>
+       which <application>libpq</application> will call
+       <emphasis>instead of</emphasis> its default
+       <function>PQdefaultSSLKeyPassHook_nss</function> password handler. The
+       callback should determine the password for the token and return a
+       pointer to it. The returned pointer should be allocated with the NSS
+       <function>PORT_Strdup</function> function. The token for which the
+       password is requested is recorded in the slot anc can be identified by
+       calling <function>PK11_GetTokenName</function>. If no password is
+       known, the callback should return <literal>NULL</literal>. The memory
+       will be owned by <productname>NSS</productname> and should not be
+       freed.
+      </para>
+
+      <para>
+        <function>PQsetSSLKeyPassHook_nss</function> is only available
+        when the server was compiled with <productname>NSS</productname>
+        support.
+      </para>
+     </listitem>
+    </varlistentry>
+
+    <varlistentry id="libpq-pqgetsslkeypasshook-nss">
+     <term><function>PQgetSSLKeyPassHook_nss</function><indexterm><primary>PQgetSSLKeyPassHook_nss</primary></indexterm></term>
+     <listitem>
+      <para>
+       <function>PQgetSSLKeyPassHook_nss</function> returns the current
+       <productname>NSS</productname> password hook, or <literal>NULL</literal>
+       if none has been set.
+
+<synopsis>
+PQsslKeyPassHook_nss_type PQgetSSLKeyPassHook_nss(void);
+</synopsis>
+      </para>
+
+      <para>
+        <function>PQgetSSLKeyPassHook_nss</function> is only available
+        when the server was compiled with <productname>nss</productname>
+        support.
+      </para>
+
      </listitem>
     </varlistentry>
 
@@ -2497,6 +2569,8 @@ void *PQsslStruct(const PGconn *conn, const char *struct_name);
       </para>
       <para>
        The struct(s) available depend on the SSL implementation in use.
+      </para>
+      <para>
        For <productname>OpenSSL</productname>, there is one struct,
        available under the name "OpenSSL", and it returns a pointer to the
        <productname>OpenSSL</productname> <literal>SSL</literal> struct.
@@ -2520,9 +2594,14 @@ void *PQsslStruct(const PGconn *conn, const char *struct_name);
 ]]></programlisting>
       </para>
       <para>
-       This structure can be used to verify encryption levels, check server
-       certificates, and more. Refer to the <productname>OpenSSL</productname>
-       documentation for information about this structure.
+       For <productname>NSS</productname>, there is one struct available under
+       the name "NSS", and it returns a pointer to the
+       <productname>NSS</productname> <literal>PRFileDesc</literal>.
+      </para>
+      <para>
+       These structures can be used to verify encryption levels, check server
+       certificates, and more. Refer to the <acronym>SSL</acronym> library
+       documentation for information about these structures.
       </para>
      </listitem>
     </varlistentry>
@@ -2549,6 +2628,10 @@ void *PQgetssl(const PGconn *conn);
        <xref linkend="libpq-PQsslInUse"/> instead, and for more details about the
        connection, use <xref linkend="libpq-PQsslAttribute"/>.
       </para>
+      <para>
+       This function returns <literal>NULL</literal> when <acronym>SSL</acronym>
+       librariaes other than <productname>OpenSSL</productname> are used.
+      </para>
      </listitem>
     </varlistentry>
 
@@ -7982,6 +8065,11 @@ void PQinitOpenSSL(int do_ssl, int do_crypto);
        before first opening a database connection.  Also be sure that you
        have done that initialization before opening a database connection.
       </para>
+
+      <para>
+       This function does nothing when using <productname>NSS</productname> as
+       the <acronym>SSL</acronym> library.
+      </para>
      </listitem>
     </varlistentry>
 
@@ -8008,6 +8096,11 @@ void PQinitSSL(int do_ssl);
        might be preferable for applications that need to work with older
        versions of <application>libpq</application>.
       </para>
+
+      <para>
+       This function does nothing when using <productname>NSS</productname> as
+       the <acronym>SSL</acronym> library.
+      </para>
      </listitem>
     </varlistentry>
    </variablelist>
diff --git a/doc/src/sgml/runtime.sgml b/doc/src/sgml/runtime.sgml
index bf877c0e0c..2578ee8c06 100644
--- a/doc/src/sgml/runtime.sgml
+++ b/doc/src/sgml/runtime.sgml
@@ -2185,15 +2185,21 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
 
   <indexterm zone="ssl-tcp">
    <primary>SSL</primary>
+   <secondary>TLS</secondary>
   </indexterm>
 
   <para>
    <productname>PostgreSQL</productname> has native support for using
    <acronym>SSL</acronym> connections to encrypt client/server communications
    for increased security. This requires that
-   <productname>OpenSSL</productname> is installed on both client and
+   a supported TLS library is installed on both client and
    server systems and that support in <productname>PostgreSQL</productname> is
    enabled at build time (see <xref linkend="installation"/>).
+   Supported libraries are <productname>OpenSSL</productname> and
+   <productname>NSS</productname>. The terms <acronym>SSL</acronym> and
+   <acronym>TLS</acronym> are often used interchangeably to mean a secure
+   connection using a <acronym>TLS</acronym> protocol, even though
+   <acronym>SSL</acronym> protocols are no longer supported.
   </para>
 
   <sect2 id="ssl-setup">
@@ -2213,8 +2219,13 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
   </para>
 
   <para>
-   To start in <acronym>SSL</acronym> mode, files containing the server certificate
-   and private key must exist.  By default, these files are expected to be
+   To start in <acronym>SSL</acronym> mode, a server certificate
+   and private key must exist. The below sections on the different libraries
+   will discuss how to configure these.
+  </para>
+   
+  <para>
+   By default, these files are expected to be
    named <filename>server.crt</filename> and <filename>server.key</filename>, respectively, in
    the server's data directory, but other names and locations can be specified
    using the configuration parameters <xref linkend="guc-ssl-cert-file"/>
@@ -2304,6 +2315,18 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
   </note>
   </sect2>
 
+  <sect2 id="ssl-nss-config">
+   <title>NSS Configuration</title>
+
+  <para>
+   <productname>PostgreSQL</productname> will look for certificates and keys
+   in the <productname>NSS</productname> database specified by the parameter
+   <xref linkend="guc-ssl-database"/> in <filename>postgresql.conf</filename>.
+   The parameters for certificate and key filenames are used to identify the
+   nicknames in the database.
+  </para>
+  </sect2>
+
   <sect2 id="ssl-client-certificates">
    <title>Using Client Certificates</title>
 
@@ -2378,7 +2401,7 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
   </sect2>
 
   <sect2 id="ssl-server-files">
-   <title>SSL Server File Usage</title>
+   <title>SSL Server File Parameter Usage</title>
 
    <para>
     <xref linkend="ssl-file-usage"/> summarizes the files that are
@@ -2425,6 +2448,14 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
       <entry>client certificate must not be on this list</entry>
      </row>
 
+     <row>
+      <entry><xref linkend="guc-ssl-database"/></entry>
+      <entry>certificate database</entry>
+      <entry>contains server certificates, keys and revocation lists; only
+      used when <productname>PostgreSQL</productname> is built with support
+      for <productname>NSS</productname>.</entry>
+     </row>
+
     </tbody>
    </tgroup>
   </table>
@@ -2448,7 +2479,7 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
   </sect2>
 
   <sect2 id="ssl-certificate-creation">
-   <title>Creating Certificates</title>
+   <title>Creating Certificates with OpenSSL</title>
 
    <para>
      To create a simple self-signed certificate for the server, valid for 365
@@ -2552,6 +2583,88 @@ openssl x509 -req -in server.csr -text -days 365 \
    </para>
   </sect2>
 
+  <sect2 id="nss-certificate-database">
+   <title>NSS Certificate Databases</title>
+
+   <para>
+    When using <productname>NSS</productname>, all certificates and keys must
+    be loaded into an <productname>NSS</productname> certificate database.
+   </para>
+
+   <para>
+    To create a new <productname>NSS</productname> certificate database and
+    load the certificates created in <xref linkend="ssl-certificate-creation" />,
+    use the following <productname>NSS</productname> commands:
+<programlisting>
+certutil -d "sql:server.db" -N --empty-password
+certutil -d "sql:server.db" -A -n server.crt -i server.crt -t "CT,C,C"
+certutil -d "sql:server.db" -A -n root.crt -i root.crt -t "CT,C,C"
+</programlisting>
+    This will give the certificate the filename as the nickname identifier in
+    the database which is created as <filename>server.db</filename>.
+   </para>
+   <para>
+    Then load the server key, which require converting it to
+    <acronym>PKCS#12</acronym> format using the
+    <productname>OpenSSL</productname> tools:
+<programlisting>
+openssl pkcs12 -export -out server.pfx -inkey server.key -in server.crt \
+  -certfile root.crt -passout pass:
+pk12util -i server.pfx -d server.db -W ''
+</programlisting>
+   </para>
+   <para>
+    Finally a certificate revocation list can be loaded with the following
+    commands:
+<programlisting>
+crlutil -I -i server.crl -d server.db -B
+</programlisting>
+   </para>
+  </sect2>
+
+  <sect2 id="nss-ssl-certificate-creation" />
+   <title>Creating Certificates with NSS</title>
+
+   <para>
+    To create a simple self-signed CA and certificate for the server, use the
+    following NSS commands. Replace
+    <replaceable>*.yourdomain.com</replaceable> with the server's host
+    name. Remove <replaceable>--empty-password</replaceable> in order to set
+    a password protecting the databases. The password can be passed to
+    <application>certutil</certutil> with the <literal>-f</literal> parameter.
+    First create a self-signed CA. To use a different certificate validity
+    time than the default, use <replaceable>-v</replaceable> to specify the
+    number of months of validity.
+<programlisting>
+mkdir root_ca.db
+certutil -N -d "sql:root_ca.db/" --empty-password
+certutil -S -d "sql:root_ca.db/" -n root_ca -s "CN=<replaceable>ca.yourdomain.com</replaceable>" \
+  -x -k rsa -g 2048 -m <replaceable>5432</replaceable> -t CTu,CTu,CTu \
+  --keyUsage certSigning -2 --nsCertType sslCA,smimeCA,objectSigningCA \
+  -Z SHA256
+certutil -L -d "sql:root_ca.db/" -n root_ca -a > root_ca.pem
+</programlisting>
+    Now create a server certificate database, and create a certificate signing
+    request for the CA. Then sign the request with the already created CA and
+    insert the certificate chain into the certificate database.
+<programlisting>
+mkdir server_cert.db
+certutil -N -d "sql:server_cert.db/" --empty-password
+certutil -R -d "sql:server_cert.db/" -s "CN=dbhost.yourdomain.com" \
+  -o server_cert.csr -g 2048 -Z SHA256
+
+certutil -C -d "sql:root_ca.db/" -c root_ca -i server_cert.csr \
+  -o server_cert.der -m <replaceable>5433</replaceable> \
+  --keyUsage keyEncipherment,dataEncipherment,digitalSignature \
+  --nsCertType sslServer -Z SHA256
+
+certutil -A -d "sql:server_cert.db/" -n root_ca -t CTu,CTu,CTu -a -i root_ca.pem
+certutil -A -d "sql:server_cert.db/" -n server_cert -t CTu,CTu,CTu -i server_cert.der
+</programlisting>
+    The server certificate is loaded into the certificate database as well as
+    the CA certificate in order to provide the chain of certificates.
+  </sect2>
+
  </sect1>
 
  <sect1 id="gssapi-enc">
-- 
2.25.1

From 0424241820e08e9a7f660f476083898a6976468a Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Wed, 28 Oct 2020 11:34:37 +0100
Subject: [PATCH v25 5/6] NSS contrib modules

---
 contrib/pgcrypto/Makefile   |   7 +-
 contrib/pgcrypto/nss.c      | 773 ++++++++++++++++++++++++++++++++++++
 contrib/sslinfo/sslinfo.c   |  32 ++
 doc/src/sgml/pgcrypto.sgml  |  38 +-
 doc/src/sgml/sslinfo.sgml   |  12 +-
 src/tools/msvc/Install.pm   |   3 +-
 src/tools/msvc/Mkvcbuild.pm |  12 +-
 7 files changed, 863 insertions(+), 14 deletions(-)
 create mode 100644 contrib/pgcrypto/nss.c

diff --git a/contrib/pgcrypto/Makefile b/contrib/pgcrypto/Makefile
index c0b4f1fcf6..ede7a78146 100644
--- a/contrib/pgcrypto/Makefile
+++ b/contrib/pgcrypto/Makefile
@@ -7,11 +7,14 @@ INT_TESTS = sha2
 OSSL_SRCS = openssl.c pgp-mpi-openssl.c
 OSSL_TESTS = sha2 des 3des cast5
 
+NSS_SRCS = nss.c pgp-mpi-internal.c imath.c blf.c
+NSS_TESTS = sha2 des 3des
+
 ZLIB_TST = pgp-compression
 ZLIB_OFF_TST = pgp-zlib-DISABLED
 
-CF_SRCS = $(if $(subst openssl,,$(with_ssl)), $(INT_SRCS), $(OSSL_SRCS))
-CF_TESTS = $(if $(subst openssl,,$(with_ssl)), $(INT_TESTS), $(OSSL_TESTS))
+CF_SRCS = $(if $(findstring openssl, $(with_ssl)), $(OSSL_SRCS), $(if $(findstring nss, $(with_ssl)), $(NSS_SRCS), $(INT_SRCS)))
+CF_TESTS = $(if $(findstring openssl, $(with_ssl)), $(OSSL_TESTS), $(if $(findstring nss, $(with_ssl)), $(NSS_TESTS), $(INT_TESTS)))
 CF_PGP_TESTS = $(if $(subst no,,$(with_zlib)), $(ZLIB_TST), $(ZLIB_OFF_TST))
 
 SRCS = \
diff --git a/contrib/pgcrypto/nss.c b/contrib/pgcrypto/nss.c
new file mode 100644
index 0000000000..da66152d65
--- /dev/null
+++ b/contrib/pgcrypto/nss.c
@@ -0,0 +1,773 @@
+/*-------------------------------------------------------------------------
+ *
+ * nss.c
+ *	  Wrapper for using NSS as a backend for pgcrypto PX
+ *
+ *
+ * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ *	  contrib/pgcrypto/nss.c
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#include "postgres.h"
+
+#include "px.h"
+#include "blf.h"
+#include "utils/memutils.h"
+
+/*
+ * BITS_PER_BYTE is also defined in the NSPR header files, so we need to undef
+ * our version to avoid compiler warnings on redefinition.
+ */
+#define pg_BITS_PER_BYTE BITS_PER_BYTE
+#undef BITS_PER_BYTE
+
+#include <nss/nss.h>
+#include <nss/hasht.h>
+#include <nss/pk11func.h>
+#include <nss/pk11pub.h>
+#include <nss/secitem.h>
+#include <nss/sechash.h>
+#include <nss/secoid.h>
+#include <nss/secerr.h>
+
+/*
+ * Ensure that the colliding definitions match, else throw an error. In case
+ * NSPR has removed the definition for some reason, make sure to put ours
+ * back again.
+ */
+#if defined(BITS_PER_BYTE)
+#if BITS_PER_BYTE != pg_BITS_PER_BYTE
+#error "incompatible byte widths between NSPR and postgres"
+#endif
+#else
+#define BITS_PER_BYTE pg_BITS_PER_BYTE
+#endif
+#undef pg_BITS_PER_BYTE
+
+/*
+ * Define our own mechanisms for Blowfish as it's not implemented by NSS.
+ */
+#define BLOWFISH_CBC	(1)
+#define BLOWFISH_ECB	(2)
+
+/*
+ * Data structures for recording cipher implementations as well as ongoing
+ * cipher operations.
+ */
+typedef struct nss_digest
+{
+	NSSInitContext *context;
+	PK11Context *hash_context;
+	HASH_HashType hash_type;
+}			nss_digest;
+
+typedef struct cipher_implementation
+{
+	/* Function pointers to cipher operations */
+	int			(*init) (PX_Cipher *pxc, const uint8 *key, unsigned klen, const uint8 *iv);
+	unsigned	(*get_block_size) (PX_Cipher *pxc);
+	unsigned	(*get_key_size) (PX_Cipher *pxc);
+	unsigned	(*get_iv_size) (PX_Cipher *pxc);
+	int			(*encrypt) (PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res);
+	int			(*decrypt) (PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res);
+	void		(*free) (PX_Cipher *pxc);
+
+	/* The mechanism describing the cipher used */
+	union
+	{
+		CK_MECHANISM_TYPE nss;
+		CK_ULONG	internal;
+	}			mechanism;
+	int			keylen;
+	bool		is_nss;
+}			cipher_implementation;
+
+typedef struct nss_cipher
+{
+	const cipher_implementation *impl;
+	NSSInitContext *context;
+	PK11Context *crypt_context;
+	SECItem    *params;
+
+	PK11SymKey *encrypt_key;
+	PK11SymKey *decrypt_key;
+}			nss_cipher;
+
+typedef struct internal_cipher
+{
+	const cipher_implementation *impl;
+	BlowfishContext context;
+}			internal_cipher;
+
+typedef struct nss_cipher_ref
+{
+	const char *name;
+	const cipher_implementation *impl;
+}			nss_cipher_ref;
+
+/*
+ * Prototypes
+ */
+static unsigned nss_get_iv_size(PX_Cipher *pxc);
+static unsigned nss_get_block_size(PX_Cipher *pxc);
+
+/*
+ * nss_GetHashOidTagByHashType
+ *
+ * Returns the corresponding SECOidTag for the passed hash type. NSS 3.43
+ * includes HASH_GetHashOidTagByHashType for this purpose, but at the time of
+ * writing is not commonly available so we need our own version till then.
+ */
+static SECOidTag
+nss_GetHashOidTagByHashType(HASH_HashType type)
+{
+	if (type == HASH_AlgMD2)
+		return SEC_OID_MD2;
+	if (type == HASH_AlgMD5)
+		return SEC_OID_MD5;
+	if (type == HASH_AlgSHA1)
+		return SEC_OID_SHA1;
+	if (type == HASH_AlgSHA224)
+		return SEC_OID_SHA224;
+	if (type == HASH_AlgSHA256)
+		return SEC_OID_SHA256;
+	if (type == HASH_AlgSHA384)
+		return SEC_OID_SHA384;
+	if (type == HASH_AlgSHA512)
+		return SEC_OID_SHA512;
+
+	return SEC_OID_UNKNOWN;
+}
+
+static unsigned
+nss_digest_block_size(PX_MD *pxmd)
+{
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+	const SECHashObject *object;
+
+	object = HASH_GetHashObject(digest->hash_type);
+	return object->blocklength;
+}
+
+static unsigned
+nss_digest_result_size(PX_MD *pxmd)
+{
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+	const SECHashObject *object;
+
+	object = HASH_GetHashObject(digest->hash_type);
+	return object->length;
+}
+
+static void
+nss_digest_free(PX_MD *pxmd)
+{
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+	PRBool		free_ctx = PR_TRUE;
+
+	PK11_DestroyContext(digest->hash_context, free_ctx);
+	NSS_ShutdownContext(digest->context);
+}
+
+static void
+nss_digest_update(PX_MD *pxmd, const uint8 *data, unsigned dlen)
+{
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+
+	PK11_DigestOp(digest->hash_context, data, dlen);
+}
+
+static void
+nss_digest_reset(PX_MD *pxmd)
+{
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+
+	PK11_DigestBegin(digest->hash_context);
+}
+
+static void
+nss_digest_finish(PX_MD *pxmd, uint8 *dst)
+{
+	unsigned int outlen;
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+	const SECHashObject *object;
+
+	object = HASH_GetHashObject(digest->hash_type);
+	PK11_DigestFinal(digest->hash_context, dst, &outlen, object->length);
+}
+
+int
+px_find_digest(const char *name, PX_MD **res)
+{
+	PX_MD	   *pxmd;
+	NSSInitParameters params;
+	NSSInitContext *nss_context;
+	bool		found = false;
+	nss_digest *digest;
+	SECStatus	status;
+	SECOidData *hash;
+	HASH_HashType t;
+
+	/*
+	 * Initialize our own NSS context without a database backing it.
+	 */
+	memset(&params, 0, sizeof(params));
+	params.length = sizeof(params);
+	nss_context = NSS_InitContext("", "", "", "", &params,
+								  NSS_INIT_READONLY | NSS_INIT_NOCERTDB |
+								  NSS_INIT_NOMODDB | NSS_INIT_FORCEOPEN |
+								  NSS_INIT_NOROOTINIT | NSS_INIT_PK11RELOAD);
+
+	/*
+	 * There is no API function for looking up a digest algorithm from a name
+	 * string, but there is a publicly accessible array which can be scanned
+	 * for the name.
+	 */
+	for (t = HASH_AlgNULL + 1; t < HASH_AlgTOTAL; t++)
+	{
+		SECOidTag	hash_oid;
+		char	   *p;
+
+		hash_oid = nss_GetHashOidTagByHashType(t);
+
+		if (hash_oid == SEC_OID_UNKNOWN)
+			return PXE_NO_HASH;
+
+		hash = SECOID_FindOIDByTag(hash_oid);
+		if (pg_strcasecmp(hash->desc, name) == 0)
+		{
+			found = true;
+			break;
+		}
+
+		/*
+		 * NSS saves the algorithm names using SHA-xxx notation whereas
+		 * OpenSSL use SHAxxx. To make sure the user finds the requested
+		 * algorithm let's remove the dash and compare that spelling as well.
+		 */
+		if ((p = strchr(hash->desc, '-')) != NULL)
+		{
+			char		tmp[12];
+
+			memcpy(tmp, hash->desc, p - hash->desc);
+			memcpy(tmp + (p - hash->desc), p + 1, strlen(hash->desc) - (p - hash->desc) + 1);
+			if (pg_strcasecmp(tmp, name) == 0)
+			{
+				found = true;
+				break;
+			}
+		}
+	}
+
+	if (!found)
+		return PXE_NO_HASH;
+
+	digest = palloc(sizeof(*digest));
+
+	digest->context = nss_context;
+	digest->hash_context = PK11_CreateDigestContext(hash->offset);
+	digest->hash_type = t;
+	if (digest->hash_context == NULL)
+	{
+		pfree(digest);
+		return -1;
+	}
+
+	status = PK11_DigestBegin(digest->hash_context);
+	if (status != SECSuccess)
+	{
+		PK11_DestroyContext(digest->hash_context, PR_TRUE);
+		pfree(digest);
+		return -1;
+	}
+
+	pxmd = palloc(sizeof(*pxmd));
+	pxmd->result_size = nss_digest_result_size;
+	pxmd->block_size = nss_digest_block_size;
+	pxmd->reset = nss_digest_reset;
+	pxmd->update = nss_digest_update;
+	pxmd->finish = nss_digest_finish;
+	pxmd->free = nss_digest_free;
+	pxmd->p.ptr = (void *) digest;
+
+	*res = pxmd;
+
+	return 0;
+}
+
+static int
+bf_init(PX_Cipher *pxc, const uint8 *key, unsigned klen, const uint8 *iv)
+{
+	internal_cipher *cipher = (internal_cipher *) pxc->ptr;
+
+	blowfish_setkey(&cipher->context, key, klen);
+	if (iv)
+		blowfish_setiv(&cipher->context, iv);
+
+	return 0;
+}
+
+static int
+bf_encrypt(PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res)
+{
+	internal_cipher *cipher = (internal_cipher *) pxc->ptr;
+	uint8	   *buf;
+
+	if (dlen == 0)
+		return 0;
+
+	if (dlen & 7)
+		return PXE_NOTBLOCKSIZE;
+
+	buf = palloc(dlen);
+	memcpy(buf, data, dlen);
+
+	if (cipher->impl->mechanism.internal == BLOWFISH_ECB)
+		blowfish_encrypt_ecb(buf, dlen, &cipher->context);
+	else
+		blowfish_encrypt_cbc(buf, dlen, &cipher->context);
+
+	memcpy(res, buf, dlen);
+	pfree(buf);
+
+	return 0;
+}
+
+static int
+bf_decrypt(PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res)
+{
+	internal_cipher *cipher = (internal_cipher *) pxc->ptr;
+
+	if (dlen == 0)
+		return 0;
+
+	if (dlen & 7)
+		return PXE_NOTBLOCKSIZE;
+
+	memcpy(res, data, dlen);
+	if (cipher->impl->mechanism.internal == BLOWFISH_ECB)
+		blowfish_decrypt_ecb(res, dlen, &cipher->context);
+	else
+		blowfish_decrypt_cbc(res, dlen, &cipher->context);
+
+	return 0;
+}
+
+static void
+bf_free(PX_Cipher *pxc)
+{
+	internal_cipher *cipher = (internal_cipher *) pxc->ptr;
+
+	pfree(cipher);
+	pfree(pxc);
+}
+
+static int
+nss_symkey_blockcipher_init(PX_Cipher *pxc, const uint8 *key, unsigned klen,
+							const uint8 *iv)
+{
+	nss_cipher *cipher = (nss_cipher *) pxc->ptr;
+	SECItem		iv_item;
+	unsigned char *iv_item_data;
+	SECItem		key_item;
+	int			keylen;
+	PK11SlotInfo *slot;
+
+	if (cipher->impl->mechanism.nss == CKM_AES_CBC ||
+		cipher->impl->mechanism.nss == CKM_AES_ECB)
+	{
+		if (klen <= 128 / 8)
+			keylen = 128 / 8;
+		else if (klen <= 192 / 8)
+			keylen = 192 / 8;
+		else if (klen <= 256 / 8)
+			keylen = 256 / 8;
+		else
+			return PXE_CIPHER_INIT;
+	}
+	else
+		keylen = cipher->impl->keylen;
+
+	key_item.type = siBuffer;
+	key_item.data = (unsigned char *) key;
+	key_item.len = keylen;
+
+	/*
+	 * If hardware acceleration is configured in NSS one can theoretically get
+	 * a better slot by calling PK11_GetBestSlot() with the mechanism passed
+	 * to it. Unless there are complaints, using the simpler API will make
+	 * error handling easier though.
+	 */
+	slot = PK11_GetInternalSlot();
+	if (!slot)
+		return PXE_CIPHER_INIT;
+
+	/*
+	 * The key must be set up for the operation, and since we don't know at
+	 * this point whether we are asked to encrypt or decrypt we need to store
+	 * both versions.
+	 */
+	cipher->decrypt_key = PK11_ImportSymKey(slot, cipher->impl->mechanism.nss,
+											PK11_OriginUnwrap,
+											CKA_DECRYPT, &key_item,
+											NULL);
+	cipher->encrypt_key = PK11_ImportSymKey(slot, cipher->impl->mechanism.nss,
+											PK11_OriginUnwrap,
+											CKA_ENCRYPT, &key_item,
+											NULL);
+	PK11_FreeSlot(slot);
+
+	if (!cipher->decrypt_key || !cipher->encrypt_key)
+		return PXE_CIPHER_INIT;
+
+	if (iv)
+	{
+		iv_item.type = siBuffer;
+		iv_item.data = (unsigned char *) iv;
+		iv_item.len = nss_get_iv_size(pxc);
+	}
+	else
+	{
+		/*
+		 * The documentation states that either passing .data = 0; .len = 0;
+		 * in the iv_item, or NULL as iv_item, to PK11_ParamFromIV should be
+		 * done when IV is missing. That however leads to segfaults in the
+		 * library, the workaround that works in modern  library versions is
+		 * to pass in a keysized zeroed out IV.
+		 */
+		iv_item_data = palloc0(nss_get_iv_size(pxc));
+		iv_item.type = siBuffer;
+		iv_item.data = iv_item_data;
+		iv_item.len = nss_get_iv_size(pxc);
+	}
+
+	cipher->params = PK11_ParamFromIV(cipher->impl->mechanism.nss, &iv_item);
+
+	/* If we had to make a mock IV, free it once made into a param */
+	if (!iv)
+		pfree(iv_item_data);
+
+	if (cipher->params == NULL)
+		return PXE_CIPHER_INIT;
+
+	return 0;
+}
+
+static int
+nss_decrypt(PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res)
+{
+	nss_cipher *cipher = (nss_cipher *) pxc->ptr;
+	SECStatus	status;
+	int			outlen;
+
+	if (!cipher->crypt_context)
+	{
+		cipher->crypt_context =
+			PK11_CreateContextBySymKey(cipher->impl->mechanism.nss, CKA_DECRYPT,
+									   cipher->decrypt_key, cipher->params);
+	}
+
+	status = PK11_CipherOp(cipher->crypt_context, res, &outlen, dlen, data, dlen);
+	if (status != SECSuccess)
+		return PXE_DECRYPT_FAILED;
+
+	return 0;
+}
+
+static int
+nss_encrypt(PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res)
+{
+	nss_cipher *cipher = (nss_cipher *) pxc->ptr;
+	SECStatus	status;
+	int			outlen;
+
+	if (!cipher->crypt_context)
+	{
+		cipher->crypt_context =
+			PK11_CreateContextBySymKey(cipher->impl->mechanism.nss, CKA_ENCRYPT,
+									   cipher->decrypt_key, cipher->params);
+	}
+
+	status = PK11_CipherOp(cipher->crypt_context, res, &outlen, dlen, data, dlen);
+
+	if (status != SECSuccess)
+		return PXE_DECRYPT_FAILED;
+
+	return 0;
+}
+
+static void
+nss_free(PX_Cipher *pxc)
+{
+	nss_cipher *cipher = pxc->ptr;
+	PRBool		free_ctx = PR_TRUE;
+
+	PK11_FreeSymKey(cipher->encrypt_key);
+	PK11_FreeSymKey(cipher->decrypt_key);
+	PK11_DestroyContext(cipher->crypt_context, free_ctx);
+	NSS_ShutdownContext(cipher->context);
+	pfree(cipher);
+
+	pfree(pxc);
+}
+
+static unsigned
+nss_get_block_size(PX_Cipher *pxc)
+{
+	nss_cipher *cipher = pxc->ptr;
+
+	return PK11_GetBlockSize(cipher->impl->mechanism.nss, NULL);
+}
+
+static unsigned
+nss_get_key_size(PX_Cipher *pxc)
+{
+	nss_cipher *cipher = pxc->ptr;
+
+	return cipher->impl->keylen;
+}
+
+static unsigned
+nss_get_iv_size(PX_Cipher *pxc)
+{
+	nss_cipher *cipher = pxc->ptr;
+
+	return PK11_GetIVLength(cipher->impl->mechanism.nss);
+}
+
+static unsigned
+bf_get_block_size(PX_Cipher *pxc)
+{
+	return 8;
+}
+
+static unsigned
+bf_get_key_size(PX_Cipher *pxc)
+{
+	return 448 / 8;
+}
+
+static unsigned
+bf_get_iv_size(PX_Cipher *pxc)
+{
+	return 8;
+}
+
+/*
+ * Cipher Implementations
+ */
+static const cipher_implementation nss_des_cbc = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_DES_CBC,
+	.keylen = 8,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_des_ecb = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_DES_ECB,
+	.keylen = 8,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_des3_cbc = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_DES3_CBC,
+	.keylen = 24,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_des3_ecb = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_DES3_ECB,
+	.keylen = 24,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_aes_cbc = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_AES_CBC,
+	.keylen = 32,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_aes_ecb = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_AES_ECB,
+	.keylen = 32,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_bf_ecb = {
+	.init = bf_init,
+	.get_block_size = bf_get_block_size,
+	.get_key_size = bf_get_key_size,
+	.get_iv_size = bf_get_iv_size,
+	.encrypt = bf_encrypt,
+	.decrypt = bf_decrypt,
+	.free = bf_free,
+	.mechanism.internal = BLOWFISH_ECB,
+	.keylen = 56,
+	.is_nss = false
+};
+
+static const cipher_implementation nss_bf_cbc = {
+	.init = bf_init,
+	.get_block_size = bf_get_block_size,
+	.get_key_size = bf_get_key_size,
+	.get_iv_size = bf_get_iv_size,
+	.encrypt = bf_encrypt,
+	.decrypt = bf_decrypt,
+	.free = bf_free,
+	.mechanism.internal = BLOWFISH_CBC,
+	.keylen = 56,
+	.is_nss = false
+};
+
+/*
+ * Lookup table for finding the implementation based on a name. CAST5 as well
+ * as BLOWFISH are defined as cipher mechanisms in NSS but error out with
+ * SEC_ERROR_INVALID_ALGORITHM. Blowfish is implemented using the internal
+ * implementation while CAST5 isn't supported at all at this time,
+ */
+static const nss_cipher_ref nss_cipher_lookup[] = {
+	{"des", &nss_des_cbc},
+	{"des-cbc", &nss_des_cbc},
+	{"des-ecb", &nss_des_ecb},
+	{"des3-cbc", &nss_des3_cbc},
+	{"3des", &nss_des3_cbc},
+	{"3des-cbc", &nss_des3_cbc},
+	{"des3-ecb", &nss_des3_ecb},
+	{"3des-ecb", &nss_des3_ecb},
+	{"aes", &nss_aes_cbc},
+	{"aes-cbc", &nss_aes_cbc},
+	{"aes-ecb", &nss_aes_ecb},
+	{"rijndael", &nss_aes_cbc},
+	{"rijndael-cbc", &nss_aes_cbc},
+	{"rijndael-ecb", &nss_aes_ecb},
+	{"blowfish", &nss_bf_cbc},
+	{"blowfish-cbc", &nss_bf_cbc},
+	{"blowfish-ecb", &nss_bf_ecb},
+	{"bf", &nss_bf_cbc},
+	{"bf-cbc", &nss_bf_cbc},
+	{"bf-ecb", &nss_bf_ecb},
+	{NULL}
+};
+
+/*
+ * px_find_cipher
+ *
+ * Search for the requested cipher and see if there is support for it, and if
+ * so return an allocated object containing the playbook for how to encrypt
+ * and decrypt using the cipher.
+ */
+int
+px_find_cipher(const char *alias, PX_Cipher **res)
+{
+	const nss_cipher_ref *cipher_ref;
+	PX_Cipher  *px_cipher;
+	NSSInitParameters params;
+	NSSInitContext *nss_context;
+	nss_cipher *cipher;
+	internal_cipher *int_cipher;
+
+	for (cipher_ref = nss_cipher_lookup; cipher_ref->name; cipher_ref++)
+	{
+		if (strcmp(cipher_ref->name, alias) == 0)
+			break;
+	}
+
+	if (!cipher_ref->name)
+		return PXE_NO_CIPHER;
+
+	/*
+	 * Fill in the PX_Cipher to pass back to PX describing the operations to
+	 * perform in order to use the cipher.
+	 */
+	px_cipher = palloc(sizeof(*px_cipher));
+	px_cipher->block_size = cipher_ref->impl->get_block_size;
+	px_cipher->key_size = cipher_ref->impl->get_key_size;
+	px_cipher->iv_size = cipher_ref->impl->get_iv_size;
+	px_cipher->free = cipher_ref->impl->free;
+	px_cipher->init = cipher_ref->impl->init;
+	px_cipher->encrypt = cipher_ref->impl->encrypt;
+	px_cipher->decrypt = cipher_ref->impl->decrypt;
+
+	/*
+	 * Set the private data, which is different for NSS and internal ciphers
+	 */
+	if (cipher_ref->impl->is_nss)
+	{
+		/*
+		 * Initialize our own NSS context without a database backing it. At
+		 * some point we might want to allow users to use stored keys in the
+		 * database rather than passing them via SELECT encrypt(), and then
+		 * this need to be changed to open a user specified database.
+		 */
+		memset(&params, 0, sizeof(params));
+		params.length = sizeof(params);
+		nss_context = NSS_InitContext("", "", "", "", &params,
+									  NSS_INIT_READONLY | NSS_INIT_NOCERTDB |
+									  NSS_INIT_NOMODDB | NSS_INIT_FORCEOPEN |
+									  NSS_INIT_NOROOTINIT | NSS_INIT_PK11RELOAD);
+
+		/* nss_cipher is the private state struct for the operation */
+		cipher = palloc(sizeof(*cipher));
+		cipher->context = nss_context;
+		cipher->impl = cipher_ref->impl;
+		cipher->crypt_context = NULL;
+
+		px_cipher->ptr = cipher;
+	}
+	else
+	{
+		int_cipher = palloc0(sizeof(*int_cipher));
+
+		int_cipher->impl = cipher_ref->impl;
+		px_cipher->ptr = int_cipher;
+	}
+
+	*res = px_cipher;
+	return 0;
+}
diff --git a/contrib/sslinfo/sslinfo.c b/contrib/sslinfo/sslinfo.c
index 30cae0bb98..3aadd90aa6 100644
--- a/contrib/sslinfo/sslinfo.c
+++ b/contrib/sslinfo/sslinfo.c
@@ -9,9 +9,11 @@
 
 #include "postgres.h"
 
+#ifdef USE_OPENSSL
 #include <openssl/x509.h>
 #include <openssl/x509v3.h>
 #include <openssl/asn1.h>
+#endif
 
 #include "access/htup_details.h"
 #include "funcapi.h"
@@ -21,6 +23,7 @@
 
 PG_MODULE_MAGIC;
 
+#ifdef USE_OPENSSL
 static Datum X509_NAME_field_to_text(X509_NAME *name, text *fieldName);
 static Datum ASN1_STRING_to_text(ASN1_STRING *str);
 
@@ -31,6 +34,7 @@ typedef struct
 {
 	TupleDesc	tupdesc;
 } SSLExtensionInfoContext;
+#endif
 
 /*
  * Indicates whether current session uses SSL
@@ -131,6 +135,7 @@ ssl_client_serial(PG_FUNCTION_ARGS)
 }
 
 
+#ifdef USE_OPENSSL
 /*
  * Converts OpenSSL ASN1_STRING structure into text
  *
@@ -282,7 +287,23 @@ ssl_issuer_field(PG_FUNCTION_ARGS)
 	else
 		return result;
 }
+#endif							/* USE_OPENSSL */
 
+#ifdef USE_NSS
+PG_FUNCTION_INFO_V1(ssl_client_dn_field);
+Datum
+ssl_client_dn_field(PG_FUNCTION_ARGS)
+{
+	PG_RETURN_NULL();
+}
+
+PG_FUNCTION_INFO_V1(ssl_issuer_field);
+Datum
+ssl_issuer_field(PG_FUNCTION_ARGS)
+{
+	PG_RETURN_NULL();
+}
+#endif							/* USE_NSS */
 
 /*
  * Returns current client certificate subject as one string
@@ -338,6 +359,7 @@ ssl_issuer_dn(PG_FUNCTION_ARGS)
 }
 
 
+#ifdef USE_OPENSSL
 /*
  * Returns information about available SSL extensions.
  *
@@ -471,3 +493,13 @@ ssl_extension_info(PG_FUNCTION_ARGS)
 	/* All done */
 	SRF_RETURN_DONE(funcctx);
 }
+#endif							/* USE_OPENSSL */
+
+#ifdef USE_NSS
+PG_FUNCTION_INFO_V1(ssl_extension_info);
+Datum
+ssl_extension_info(PG_FUNCTION_ARGS)
+{
+	PG_RETURN_NULL();
+}
+#endif							/* USE_NSS */
diff --git a/doc/src/sgml/pgcrypto.sgml b/doc/src/sgml/pgcrypto.sgml
index b6bb23de0f..bf486f0c07 100644
--- a/doc/src/sgml/pgcrypto.sgml
+++ b/doc/src/sgml/pgcrypto.sgml
@@ -45,8 +45,9 @@ digest(data bytea, type text) returns bytea
     <literal>sha224</literal>, <literal>sha256</literal>,
     <literal>sha384</literal> and <literal>sha512</literal>.
     If <filename>pgcrypto</filename> was built with
-    <productname>OpenSSL</productname>, more algorithms are available, as
-    detailed in <xref linkend="pgcrypto-with-without-openssl"/>.
+    <productname>OpenSSL</productname> or <productname>NSS</productname>,
+    more algorithms are available, as
+    detailed in <xref linkend="pgcrypto-with-without-openssl-nss"/>.
    </para>
 
    <para>
@@ -764,7 +765,7 @@ pgp_sym_encrypt(data, psw, 'compress-algo=1, cipher-algo=aes256')
     Which cipher algorithm to use.
    </para>
 <literallayout>
-Values: bf, aes128, aes192, aes256 (OpenSSL-only: <literal>3des</literal>, <literal>cast5</literal>)
+Values: bf, aes128, aes192, aes256 (OpenSSL-only: <literal>3des</literal>, <literal>cast5</literal>; NSS-only: <literal>3des</literal>)
 Default: aes128
 Applies to: pgp_sym_encrypt, pgp_pub_encrypt
 </literallayout>
@@ -1153,8 +1154,8 @@ gen_random_uuid() returns uuid
    <para>
     <filename>pgcrypto</filename> configures itself according to the findings of the
     main PostgreSQL <literal>configure</literal> script.  The options that
-    affect it are <literal>--with-zlib</literal> and
-    <literal>--with-ssl=openssl</literal>.
+    affect it are <literal>--with-zlib</literal>,
+    <literal>--with-ssl=openssl</literal> and <literal>--with-ssl=nss</literal>.
    </para>
 
    <para>
@@ -1169,14 +1170,16 @@ gen_random_uuid() returns uuid
     BIGNUM functions.
    </para>
 
-   <table id="pgcrypto-with-without-openssl">
-    <title>Summary of Functionality with and without OpenSSL</title>
-    <tgroup cols="3">
+   <table id="pgcrypto-with-without-openssl-nss">
+    <title>Summary of Functionality with and without external cryptographic
+      library</title>
+    <tgroup cols="4">
      <thead>
       <row>
        <entry>Functionality</entry>
        <entry>Built-in</entry>
        <entry>With OpenSSL</entry>
+       <entry>With NSS</entry>
       </row>
      </thead>
      <tbody>
@@ -1184,51 +1187,67 @@ gen_random_uuid() returns uuid
        <entry>MD5</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>SHA1</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>SHA224/256/384/512</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>Other digest algorithms</entry>
        <entry>no</entry>
        <entry>yes (Note 1)</entry>
+       <entry>yes (Note 1)</entry>
       </row>
       <row>
        <entry>Blowfish</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>AES</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>DES/3DES/CAST5</entry>
        <entry>no</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
+      </row>
+      <row>
+       <entry>CAST5</entry>
+       <entry>no</entry>
+       <entry>yes</entry>
+       <entry>no</entry>
       </row>
       <row>
        <entry>Raw encryption</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>PGP Symmetric encryption</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>PGP Public-Key encryption</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
      </tbody>
     </tgroup>
@@ -1241,7 +1260,8 @@ gen_random_uuid() returns uuid
    <orderedlist>
     <listitem>
      <para>
-      Any digest algorithm <productname>OpenSSL</productname> supports
+      Any digest algorithm <productname>OpenSSL</productname> and
+      <productname>NSS</productname> supports
       is automatically picked up.
       This is not possible with ciphers, which need to be supported
       explicitly.
diff --git a/doc/src/sgml/sslinfo.sgml b/doc/src/sgml/sslinfo.sgml
index 2a9c45a111..f3ae2fc3b8 100644
--- a/doc/src/sgml/sslinfo.sgml
+++ b/doc/src/sgml/sslinfo.sgml
@@ -22,7 +22,8 @@
 
  <para>
   This extension won't build at all unless the installation was
-  configured with <literal>--with-ssl=openssl</literal>.
+  configured with SSL support, such as <literal>--with-ssl=openssl</literal>
+  or <literal>--with-ssl=nss</literal>.
  </para>
 
  <sect2>
@@ -208,6 +209,9 @@ emailAddress
      the X.500 and X.509 standards, so you cannot just assign arbitrary
      meaning to them.
     </para>
+    <para>
+     This function is only available when using <productname>OpenSSL</productname>.
+    </para>
     </listitem>
    </varlistentry>
 
@@ -223,6 +227,9 @@ emailAddress
      Same as <function>ssl_client_dn_field</function>, but for the certificate issuer
      rather than the certificate subject.
     </para>
+    <para>
+     This function is only available when using <productname>OpenSSL</productname>.
+    </para>
     </listitem>
    </varlistentry>
 
@@ -238,6 +245,9 @@ emailAddress
      Provide information about extensions of client certificate: extension name,
      extension value, and if it is a critical extension.
     </para>
+    <para>
+     This function is only available when using <productname>OpenSSL</productname>.
+    </para>
     </listitem>
    </varlistentry>
   </variablelist>
diff --git a/src/tools/msvc/Install.pm b/src/tools/msvc/Install.pm
index ea3af48777..afe72a7e97 100644
--- a/src/tools/msvc/Install.pm
+++ b/src/tools/msvc/Install.pm
@@ -438,7 +438,8 @@ sub CopyContribFiles
 		{
 			# These configuration-based exclusions must match vcregress.pl
 			next if ($d eq "uuid-ossp"  && !defined($config->{uuid}));
-			next if ($d eq "sslinfo"    && !defined($config->{openssl}));
+			next if ($d eq "sslinfo"    && !defined($config->{openssl})
+			  && !defined($config->{nss}));
 			next if ($d eq "xml2"       && !defined($config->{xml}));
 			next if ($d =~ /_plperl$/   && !defined($config->{perl}));
 			next if ($d =~ /_plpython$/ && !defined($config->{python}));
diff --git a/src/tools/msvc/Mkvcbuild.pm b/src/tools/msvc/Mkvcbuild.pm
index ff01acf3f6..660387d0e8 100644
--- a/src/tools/msvc/Mkvcbuild.pm
+++ b/src/tools/msvc/Mkvcbuild.pm
@@ -445,9 +445,14 @@ sub mkvcbuild
 		push @contrib_excludes, 'xml2';
 	}
 
+	if (!$solution->{options}->{openssl} && !$solution->{options}->{nss})
+	{
+		push @contrib_excludes, 'sslinfo';
+	}
+
 	if (!$solution->{options}->{openssl})
 	{
-		push @contrib_excludes, 'sslinfo', 'ssl_passphrase_callback';
+		push @contrib_excludes, 'ssl_passphrase_callback';
 	}
 
 	if (!$solution->{options}->{uuid})
@@ -477,6 +482,11 @@ sub mkvcbuild
 		$pgcrypto->AddFiles('contrib/pgcrypto', 'openssl.c',
 			'pgp-mpi-openssl.c');
 	}
+	elsif ($solution->{options}->{nss})
+	{
+		$pgcrypto->AddFiles('contrib/pgcrypto', 'nss.c',
+			'pgp-mpi-internal.c', 'imath.c', 'blf.c');
+	}
 	else
 	{
 		$pgcrypto->AddFiles(
-- 
2.25.1

From 87f5997c5406f080b34ba5836ed197723bd0e28f Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Mon, 18 Jan 2021 13:04:49 +0100
Subject: [PATCH v25 6/6] NSS cryptohash support

---
 src/common/cryptohash_nss.c | 255 ++++++++++++++++++++++++++++++++++++
 src/tools/msvc/Mkvcbuild.pm |   4 +
 2 files changed, 259 insertions(+)
 create mode 100644 src/common/cryptohash_nss.c

diff --git a/src/common/cryptohash_nss.c b/src/common/cryptohash_nss.c
new file mode 100644
index 0000000000..3e2b5776c1
--- /dev/null
+++ b/src/common/cryptohash_nss.c
@@ -0,0 +1,255 @@
+/*-------------------------------------------------------------------------
+ *
+ * cryptohash_nss.c
+ *	  Set of wrapper routines on top of NSS to support cryptographic
+ *	  hash functions.
+ *
+ * This should only be used if code is compiled with NSS support.
+ *
+ * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ *		  src/common/cryptohash_nss.c
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#ifndef FRONTEND
+#include "postgres.h"
+#else
+#include "postgres_fe.h"
+#endif
+
+/*
+ * BITS_PER_BYTE is also defined in the NSPR header files, so we need to undef
+ * our version to avoid compiler warnings on redefinition.
+ */
+#define pg_BITS_PER_BYTE BITS_PER_BYTE
+#undef BITS_PER_BYTE
+
+#include <nss/nss.h>
+#include <nss/hasht.h>
+#include <nss/pk11func.h>
+#include <nss/pk11pub.h>
+#include <nss/secitem.h>
+#include <nss/sechash.h>
+#include <nss/secoid.h>
+#include <nss/secerr.h>
+
+/*
+ * Ensure that the colliding definitions match, else throw an error. In case
+ * NSPR has removed the definition for some reason, make sure to put ours
+ * back again.
+ */
+#if defined(BITS_PER_BYTE)
+#if BITS_PER_BYTE != pg_BITS_PER_BYTE
+#error "incompatible byte widths between NSPR and postgres"
+#endif
+#else
+#define BITS_PER_BYTE pg_BITS_PER_BYTE
+#endif
+#undef pg_BITS_PER_BYTE
+
+#include "common/cryptohash.h"
+#ifndef FRONTEND
+#include "utils/memutils.h"
+#include "utils/resowner.h"
+#include "utils/resowner_private.h"
+#endif
+
+/*
+ * In the backend, use an allocation in TopMemoryContext to count for
+ * resowner cleanup handling.  In the frontend, use malloc to be able
+ * to return a failure status back to the caller.
+ */
+#ifndef FRONTEND
+#define ALLOC(size) MemoryContextAlloc(TopMemoryContext, size)
+#define FREE(ptr) pfree(ptr)
+#else
+#define ALLOC(size) malloc(size)
+#define FREE(ptr) free(ptr)
+#endif
+
+/*
+ * Internal pg_cryptohash_ctx structure.
+ */
+struct pg_cryptohash_ctx
+{
+	pg_cryptohash_type type;
+
+	PK11Context *pk11_context;
+	HASH_HashType hash_type;
+
+#ifndef FRONTEND
+	ResourceOwner resowner;
+#endif
+};
+
+/*
+ * pg_cryptohash_create
+ *
+ * Create and allocate a new hash context. Returns NULL on failure in the
+ * frontend, and raise error without returning in the backend.
+ */
+pg_cryptohash_ctx *
+pg_cryptohash_create(pg_cryptohash_type type)
+{
+	NSSInitParameters params;
+	pg_cryptohash_ctx *ctx;
+	SECOidData *hash;
+	SECStatus status;
+
+#ifndef FRONTEND
+	/*
+	 * Make sure that the resource owner has space to remember this reference.
+	 * This can error out with "out of memory", so do this before any other
+	 * allocation to avoid leaking.
+	 */
+	ResourceOwnerEnlargeCryptoHash(CurrentResourceOwner);
+#endif
+
+	ctx = ALLOC(sizeof(pg_cryptohash_ctx));
+
+	if (!ctx)
+		goto error;
+
+	switch(type)
+	{
+		case PG_SHA1:
+			ctx->hash_type = SEC_OID_SHA1;
+			break;
+		case PG_MD5:
+			ctx->hash_type = SEC_OID_MD5;
+			break;
+		case PG_SHA224:
+			ctx->hash_type = SEC_OID_SHA224;
+			break;
+		case PG_SHA256:
+			ctx->hash_type = SEC_OID_SHA256;
+			break;
+		case PG_SHA384:
+			ctx->hash_type = SEC_OID_SHA384;
+			break;
+		case PG_SHA512:
+			ctx->hash_type = SEC_OID_SHA512;
+			break;
+	}
+
+	/*
+	 * Initialize our own NSS context without a database backing it.
+	 */
+	memset(&params, 0, sizeof(params));
+	params.length = sizeof(params);
+	status = NSS_NoDB_Init(".");
+	if (status != SECSuccess)
+	{
+		explicit_bzero(ctx, sizeof(pg_cryptohash_ctx));
+		FREE(ctx);
+		goto error;
+	}
+
+	ctx->type = type;
+	hash = SECOID_FindOIDByTag(ctx->hash_type);
+	ctx->pk11_context = PK11_CreateDigestContext(hash->offset);
+	if (!ctx->pk11_context)
+	{
+		explicit_bzero(ctx, sizeof(pg_cryptohash_ctx));
+		FREE(ctx);
+		goto error;
+	}
+
+#ifndef FRONTEND
+	ctx->resowner = CurrentResourceOwner;
+	ResourceOwnerRememberCryptoHash(CurrentResourceOwner,
+									PointerGetDatum(ctx));
+#endif
+
+	return ctx;
+
+error:
+#ifndef FRONTEND
+	ereport(ERROR,
+			(errcode(ERRCODE_OUT_OF_MEMORY),
+			 errmsg("out of memory")));
+#endif
+	return NULL;
+}
+
+/*
+ * pg_cryptohash_init
+ *			Initialize the passed hash context
+ *
+ * Returns 0 on success, -1 on failure.
+ */
+int
+pg_cryptohash_init(pg_cryptohash_ctx *ctx)
+{
+	SECStatus		status;
+
+	status = PK11_DigestBegin(ctx->pk11_context);
+
+	if (status != SECSuccess)
+		return -1;
+	return 0;
+}
+
+/*
+ * pg_cryptohash_update
+ *
+ * Update a hash context.  Returns 0 on success, -1 on failure.
+ */
+int
+pg_cryptohash_update(pg_cryptohash_ctx *ctx, const uint8 *data, size_t len)
+{
+	SECStatus	status;
+
+	if (ctx == NULL)
+		return -1;
+
+	status = PK11_DigestOp(ctx->pk11_context, data, len);
+	if (status != SECSuccess)
+		return -1;
+
+	return 0;
+}
+
+/*
+ * pg_cryptohash_final
+ *
+ * Finalize a hash context.  Returns 0 on success, -1 on failure.
+ */
+int
+pg_cryptohash_final(pg_cryptohash_ctx *ctx, uint8 *dest)
+{
+	SECStatus	status;
+	unsigned int outlen;
+	const SECHashObject *object;
+
+	object = HASH_GetHashObject(ctx->hash_type);
+	status = PK11_DigestFinal(ctx->pk11_context, dest, &outlen, object->length);
+
+	if (status != SECSuccess)
+		return -1;
+	return 0;
+}
+
+/*
+ * pg_cryptohash_free
+ *
+ * Free a hash context and the associated NSS context.
+ */
+void
+pg_cryptohash_free(pg_cryptohash_ctx *ctx)
+{
+	PRBool		free_context = PR_TRUE;
+	if (!ctx)
+		return;
+
+	PK11_DestroyContext(ctx->pk11_context, free_context);
+#ifndef FRONTEND
+	ResourceOwnerForgetCryptoHash(ctx->resowner, PointerGetDatum(ctx));
+#endif
+	explicit_bzero(ctx, sizeof(pg_cryptohash_ctx));
+	FREE(ctx);
+}
diff --git a/src/tools/msvc/Mkvcbuild.pm b/src/tools/msvc/Mkvcbuild.pm
index 660387d0e8..180eb0aa3f 100644
--- a/src/tools/msvc/Mkvcbuild.pm
+++ b/src/tools/msvc/Mkvcbuild.pm
@@ -132,6 +132,10 @@ sub mkvcbuild
 		push(@pgcommonallfiles, 'cryptohash_openssl.c');
 		push(@pgcommonallfiles, 'protocol_openssl.c');
 	}
+	elsif ($solution->{options}->{nss})
+	{
+		push(@pgcommonallfiles, 'cryptohash_nss.c');
+	}
 	else
 	{
 		push(@pgcommonallfiles, 'cryptohash.c');
-- 
2.25.1

From d6e0f53f970461ec07e9616d0cac4db3e143fd48 Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Mon, 8 Feb 2021 23:52:55 +0100
Subject: [PATCH v26 10/10] nss: Build infrastructure

Finally this adds the infrastructure to build a postgres installation
with libnss support.
---
 configure                     | 294 +++++++++++++++++++++++++++++++++-
 configure.ac                  |  31 +++-
 src/backend/libpq/Makefile    |   4 +
 src/common/Makefile           |   6 +
 src/include/pg_config.h.in    |   6 +
 src/interfaces/libpq/Makefile |   5 +
 src/tools/msvc/Install.pm     |   3 +-
 src/tools/msvc/Mkvcbuild.pm   |  39 ++++-
 src/tools/msvc/Solution.pm    |  20 +++
 9 files changed, 396 insertions(+), 12 deletions(-)

diff --git a/configure b/configure
index ce9ea36999..143726c79c 100755
--- a/configure
+++ b/configure
@@ -654,6 +654,8 @@ UUID_LIBS
 LDAP_LIBS_BE
 LDAP_LIBS_FE
 with_ssl
+NSPR_CONFIG
+NSS_CONFIG
 PTHREAD_CFLAGS
 PTHREAD_LIBS
 PTHREAD_CC
@@ -1570,7 +1572,7 @@ Optional Packages:
                           use system time zone data in DIR
   --without-zlib          do not use Zlib
   --with-gnu-ld           assume the C compiler uses GNU ld [default=no]
-  --with-ssl=LIB          use LIB for SSL/TLS support (openssl)
+  --with-ssl=LIB          use LIB for SSL/TLS support (openssl, nss)
   --with-openssl          obsolete spelling of --with-ssl=openssl
 
 Some influential environment variables:
@@ -12462,8 +12464,274 @@ done
 
 $as_echo "#define USE_OPENSSL 1" >>confdefs.h
 
+elif test "$with_ssl" = nss ; then
+  # TODO: fallback in case nss-config/nspr-config aren't found.
+  if test -z "$NSS_CONFIG"; then
+  for ac_prog in nss-config
+do
+  # Extract the first word of "$ac_prog", so it can be a program name with args.
+set dummy $ac_prog; ac_word=$2
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
+$as_echo_n "checking for $ac_word... " >&6; }
+if ${ac_cv_path_NSS_CONFIG+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  case $NSS_CONFIG in
+  [\\/]* | ?:[\\/]*)
+  ac_cv_path_NSS_CONFIG="$NSS_CONFIG" # Let the user override the test with a path.
+  ;;
+  *)
+  as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH
+do
+  IFS=$as_save_IFS
+  test -z "$as_dir" && as_dir=.
+    for ac_exec_ext in '' $ac_executable_extensions; do
+  if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
+    ac_cv_path_NSS_CONFIG="$as_dir/$ac_word$ac_exec_ext"
+    $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
+    break 2
+  fi
+done
+  done
+IFS=$as_save_IFS
+
+  ;;
+esac
+fi
+NSS_CONFIG=$ac_cv_path_NSS_CONFIG
+if test -n "$NSS_CONFIG"; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $NSS_CONFIG" >&5
+$as_echo "$NSS_CONFIG" >&6; }
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+fi
+
+
+  test -n "$NSS_CONFIG" && break
+done
+
+else
+  # Report the value of NSS_CONFIG in configure's output in all cases.
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for NSS_CONFIG" >&5
+$as_echo_n "checking for NSS_CONFIG... " >&6; }
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $NSS_CONFIG" >&5
+$as_echo "$NSS_CONFIG" >&6; }
+fi
+
+  if test -z "$NSPR_CONFIG"; then
+  for ac_prog in nspr-config
+do
+  # Extract the first word of "$ac_prog", so it can be a program name with args.
+set dummy $ac_prog; ac_word=$2
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
+$as_echo_n "checking for $ac_word... " >&6; }
+if ${ac_cv_path_NSPR_CONFIG+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  case $NSPR_CONFIG in
+  [\\/]* | ?:[\\/]*)
+  ac_cv_path_NSPR_CONFIG="$NSPR_CONFIG" # Let the user override the test with a path.
+  ;;
+  *)
+  as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH
+do
+  IFS=$as_save_IFS
+  test -z "$as_dir" && as_dir=.
+    for ac_exec_ext in '' $ac_executable_extensions; do
+  if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
+    ac_cv_path_NSPR_CONFIG="$as_dir/$ac_word$ac_exec_ext"
+    $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
+    break 2
+  fi
+done
+  done
+IFS=$as_save_IFS
+
+  ;;
+esac
+fi
+NSPR_CONFIG=$ac_cv_path_NSPR_CONFIG
+if test -n "$NSPR_CONFIG"; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $NSPR_CONFIG" >&5
+$as_echo "$NSPR_CONFIG" >&6; }
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+fi
+
+
+  test -n "$NSPR_CONFIG" && break
+done
+
+else
+  # Report the value of NSPR_CONFIG in configure's output in all cases.
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for NSPR_CONFIG" >&5
+$as_echo_n "checking for NSPR_CONFIG... " >&6; }
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $NSPR_CONFIG" >&5
+$as_echo "$NSPR_CONFIG" >&6; }
+fi
+
+  if test -n "$NSS_CONFIG"; then
+    NSS_LIBS=`$NSS_CONFIG --libs`
+	NSS_CFLAGS=`$NSS_CONFIG --cflags`
+  fi
+  if test -n "$NSPR_CONFIG"; then
+	NSPR_LIBS=`$NSPR_CONFIG --libs`
+	NSPR_CFLAGS=`$NSPR_CONFIG --cflags`
+  fi
+
+  LDFLAGS="$LDFLAGS $NSS_LIBS $NSPR_LIBS"
+  CFLAGS="$CFLAGS $NSS_CFLAGS $NSPR_CFLAGS"
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for NSS_InitContext in -lnss3" >&5
+$as_echo_n "checking for NSS_InitContext in -lnss3... " >&6; }
+if ${ac_cv_lib_nss3_NSS_InitContext+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lnss3  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char NSS_InitContext ();
+int
+main ()
+{
+return NSS_InitContext ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_lib_nss3_NSS_InitContext=yes
+else
+  ac_cv_lib_nss3_NSS_InitContext=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_nss3_NSS_InitContext" >&5
+$as_echo "$ac_cv_lib_nss3_NSS_InitContext" >&6; }
+if test "x$ac_cv_lib_nss3_NSS_InitContext" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_LIBNSS3 1
+_ACEOF
+
+  LIBS="-lnss3 $LIBS"
+
+else
+  as_fn_error $? "library 'nss3' is required for NSS" "$LINENO" 5
+fi
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for PR_GetDefaultIOMethods in -lnspr4" >&5
+$as_echo_n "checking for PR_GetDefaultIOMethods in -lnspr4... " >&6; }
+if ${ac_cv_lib_nspr4_PR_GetDefaultIOMethods+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lnspr4  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char PR_GetDefaultIOMethods ();
+int
+main ()
+{
+return PR_GetDefaultIOMethods ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_lib_nspr4_PR_GetDefaultIOMethods=yes
+else
+  ac_cv_lib_nspr4_PR_GetDefaultIOMethods=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_nspr4_PR_GetDefaultIOMethods" >&5
+$as_echo "$ac_cv_lib_nspr4_PR_GetDefaultIOMethods" >&6; }
+if test "x$ac_cv_lib_nspr4_PR_GetDefaultIOMethods" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_LIBNSPR4 1
+_ACEOF
+
+  LIBS="-lnspr4 $LIBS"
+
+else
+  as_fn_error $? "library 'nspr4' is required for NSS" "$LINENO" 5
+fi
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for SSL_GetImplementedCiphers in -lssl3" >&5
+$as_echo_n "checking for SSL_GetImplementedCiphers in -lssl3... " >&6; }
+if ${ac_cv_lib_ssl3_SSL_GetImplementedCiphers+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lssl3  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char SSL_GetImplementedCiphers ();
+int
+main ()
+{
+return SSL_GetImplementedCiphers ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_lib_ssl3_SSL_GetImplementedCiphers=yes
+else
+  ac_cv_lib_ssl3_SSL_GetImplementedCiphers=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_ssl3_SSL_GetImplementedCiphers" >&5
+$as_echo "$ac_cv_lib_ssl3_SSL_GetImplementedCiphers" >&6; }
+if test "x$ac_cv_lib_ssl3_SSL_GetImplementedCiphers" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_LIBSSL3 1
+_ACEOF
+
+  LIBS="-lssl3 $LIBS"
+
+else
+  as_fn_error $? "library 'ssl3' is required for NSS" "$LINENO" 5
+fi
+
+
+$as_echo "#define USE_NSS 1" >>confdefs.h
+
 elif test "$with_ssl" != no ; then
-  as_fn_error $? "--with-ssl must specify openssl" "$LINENO" 5
+  as_fn_error $? "--with-ssl must specify one of openssl or nss" "$LINENO" 5
 fi
 
 
@@ -13369,6 +13637,23 @@ else
 fi
 
 
+elif test "$with_ssl" = nss ; then
+  ac_fn_c_check_header_mongrel "$LINENO" "nss/ssl.h" "ac_cv_header_nss_ssl_h" "$ac_includes_default"
+if test "x$ac_cv_header_nss_ssl_h" = xyes; then :
+
+else
+  as_fn_error $? "header file <nss/ssl.h> is required for NSS" "$LINENO" 5
+fi
+
+
+  ac_fn_c_check_header_mongrel "$LINENO" "nss/nss.h" "ac_cv_header_nss_nss_h" "$ac_includes_default"
+if test "x$ac_cv_header_nss_nss_h" = xyes; then :
+
+else
+  as_fn_error $? "header file <nss/nss.h> is required for NSS" "$LINENO" 5
+fi
+
+
 fi
 
 if test "$with_pam" = yes ; then
@@ -18131,6 +18416,9 @@ $as_echo_n "checking which random number source to use... " >&6; }
 if test x"$with_ssl" = x"openssl" ; then
   { $as_echo "$as_me:${as_lineno-$LINENO}: result: OpenSSL" >&5
 $as_echo "OpenSSL" >&6; }
+elif test x"$with_ssl" = x"nss" ; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: NSS" >&5
+$as_echo "NSS" >&6; }
 elif test x"$PORTNAME" = x"win32" ; then
   { $as_echo "$as_me:${as_lineno-$LINENO}: result: Windows native" >&5
 $as_echo "Windows native" >&6; }
@@ -18160,7 +18448,7 @@ fi
   if test x"$ac_cv_file__dev_urandom" = x"no" ; then
     as_fn_error $? "
 no source of strong random numbers was found
-PostgreSQL can use OpenSSL, native Windows API or /dev/urandom as a source of random numbers." "$LINENO" 5
+PostgreSQL can use OpenSSL, NSS, native Windows API or /dev/urandom as a source of random numbers." "$LINENO" 5
   fi
 fi
 
diff --git a/configure.ac b/configure.ac
index 07da84d401..59657a6010 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1201,7 +1201,7 @@ fi
 #
 # There is currently only one supported SSL/TLS library: OpenSSL.
 #
-PGAC_ARG_REQ(with, ssl, [LIB], [use LIB for SSL/TLS support (openssl)])
+PGAC_ARG_REQ(with, ssl, [LIB], [use LIB for SSL/TLS support (openssl, nss)])
 if test x"$with_ssl" = x"" ; then
   with_ssl=no
 fi
@@ -1235,8 +1235,28 @@ if test "$with_ssl" = openssl ; then
   # function was removed.
   AC_CHECK_FUNCS([CRYPTO_lock])
   AC_DEFINE([USE_OPENSSL], 1, [Define to 1 if you have OpenSSL support.])
+elif test "$with_ssl" = nss ; then
+  # TODO: fallback in case nss-config/nspr-config aren't found.
+  PGAC_PATH_PROGS(NSS_CONFIG, nss-config)
+  PGAC_PATH_PROGS(NSPR_CONFIG, nspr-config)
+  if test -n "$NSS_CONFIG"; then
+    NSS_LIBS=`$NSS_CONFIG --libs`
+	NSS_CFLAGS=`$NSS_CONFIG --cflags`
+  fi
+  if test -n "$NSPR_CONFIG"; then
+	NSPR_LIBS=`$NSPR_CONFIG --libs`
+	NSPR_CFLAGS=`$NSPR_CONFIG --cflags`
+  fi
+
+  LDFLAGS="$LDFLAGS $NSS_LIBS $NSPR_LIBS"
+  CFLAGS="$CFLAGS $NSS_CFLAGS $NSPR_CFLAGS"
+
+  AC_CHECK_LIB(nss3, NSS_InitContext, [], [AC_MSG_ERROR([library 'nss3' is required for NSS])])
+  AC_CHECK_LIB(nspr4, PR_GetDefaultIOMethods, [], [AC_MSG_ERROR([library 'nspr4' is required for NSS])])
+  AC_CHECK_LIB(ssl3, SSL_GetImplementedCiphers, [], [AC_MSG_ERROR([library 'ssl3' is required for NSS])])
+  AC_DEFINE([USE_NSS], 1, [Define to 1 if you have NSS support,])
 elif test "$with_ssl" != no ; then
-  AC_MSG_ERROR([--with-ssl must specify openssl])
+  AC_MSG_ERROR([--with-ssl must specify one of openssl or nss])
 fi
 AC_SUBST(with_ssl)
 
@@ -1414,6 +1434,9 @@ fi
 if test "$with_ssl" = openssl ; then
   AC_CHECK_HEADER(openssl/ssl.h, [], [AC_MSG_ERROR([header file <openssl/ssl.h> is required for OpenSSL])])
   AC_CHECK_HEADER(openssl/err.h, [], [AC_MSG_ERROR([header file <openssl/err.h> is required for OpenSSL])])
+elif test "$with_ssl" = nss ; then
+  AC_CHECK_HEADER(nss/ssl.h, [], [AC_MSG_ERROR([header file <nss/ssl.h> is required for NSS])])
+  AC_CHECK_HEADER(nss/nss.h, [], [AC_MSG_ERROR([header file <nss/nss.h> is required for NSS])])
 fi
 
 if test "$with_pam" = yes ; then
@@ -2170,6 +2193,8 @@ fi
 AC_MSG_CHECKING([which random number source to use])
 if test x"$with_ssl" = x"openssl" ; then
   AC_MSG_RESULT([OpenSSL])
+elif test x"$with_ssl" = x"nss" ; then
+  AC_MSG_RESULT([NSS])
 elif test x"$PORTNAME" = x"win32" ; then
   AC_MSG_RESULT([Windows native])
 else
@@ -2179,7 +2204,7 @@ else
   if test x"$ac_cv_file__dev_urandom" = x"no" ; then
     AC_MSG_ERROR([
 no source of strong random numbers was found
-PostgreSQL can use OpenSSL, native Windows API or /dev/urandom as a source of random numbers.])
+PostgreSQL can use OpenSSL, NSS, native Windows API or /dev/urandom as a source of random numbers.])
   fi
 fi
 
diff --git a/src/backend/libpq/Makefile b/src/backend/libpq/Makefile
index 8d1d16b0fc..045d2c2f6b 100644
--- a/src/backend/libpq/Makefile
+++ b/src/backend/libpq/Makefile
@@ -30,6 +30,10 @@ OBJS = \
 
 ifeq ($(with_ssl),openssl)
 OBJS += be-secure-openssl.o
+else
+ifeq ($(with_ssl),nss)
+OBJS += be-secure-nss.o
+endif
 endif
 
 ifeq ($(with_gssapi),yes)
diff --git a/src/common/Makefile b/src/common/Makefile
index 5422579a6a..57d44080b4 100644
--- a/src/common/Makefile
+++ b/src/common/Makefile
@@ -85,12 +85,18 @@ OBJS_COMMON += \
 	protocol_openssl.o \
 	cryptohash_openssl.o
 else
+ifeq ($(with_ssl),nss)
+OBJS_COMMON += \
+	cipher_nss.o \
+	cryptohash_nss.o
+else
 OBJS_COMMON += \
 	cryptohash.o \
 	md5.o \
 	sha1.o \
 	sha2.o
 endif
+endif
 
 # A few files are currently only built for frontend, not server
 # (Mkvcbuild.pm has a copy of this list, too).  logging.c is excluded
diff --git a/src/include/pg_config.h.in b/src/include/pg_config.h.in
index 55cab4d2bf..fa5a977617 100644
--- a/src/include/pg_config.h.in
+++ b/src/include/pg_config.h.in
@@ -905,6 +905,12 @@
 /* Define to 1 to build with PAM support. (--with-pam) */
 #undef USE_PAM
 
+/* Define to build with NSS support (--with-ssl=nss) */
+#undef USE_NSS
+
+/* Define to use NSS for random number generation */
+#undef USE_NSS_RANDOM
+
 /* Define to 1 to use software CRC-32C implementation (slicing-by-8). */
 #undef USE_SLICING_BY_8_CRC32C
 
diff --git a/src/interfaces/libpq/Makefile b/src/interfaces/libpq/Makefile
index f74677eaf9..e10d8bef42 100644
--- a/src/interfaces/libpq/Makefile
+++ b/src/interfaces/libpq/Makefile
@@ -56,6 +56,11 @@ OBJS += \
 	fe-secure-openssl.o
 endif
 
+ifeq ($(with_ssl), nss)
+OBJS += \
+	fe-secure-nss.o
+endif
+
 ifeq ($(with_gssapi),yes)
 OBJS += \
 	fe-gssapi-common.o \
diff --git a/src/tools/msvc/Install.pm b/src/tools/msvc/Install.pm
index ea3af48777..afe72a7e97 100644
--- a/src/tools/msvc/Install.pm
+++ b/src/tools/msvc/Install.pm
@@ -438,7 +438,8 @@ sub CopyContribFiles
 		{
 			# These configuration-based exclusions must match vcregress.pl
 			next if ($d eq "uuid-ossp"  && !defined($config->{uuid}));
-			next if ($d eq "sslinfo"    && !defined($config->{openssl}));
+			next if ($d eq "sslinfo"    && !defined($config->{openssl})
+			  && !defined($config->{nss}));
 			next if ($d eq "xml2"       && !defined($config->{xml}));
 			next if ($d =~ /_plperl$/   && !defined($config->{perl}));
 			next if ($d =~ /_plpython$/ && !defined($config->{python}));
diff --git a/src/tools/msvc/Mkvcbuild.pm b/src/tools/msvc/Mkvcbuild.pm
index 49614106dc..53b5a71726 100644
--- a/src/tools/msvc/Mkvcbuild.pm
+++ b/src/tools/msvc/Mkvcbuild.pm
@@ -132,6 +132,11 @@ sub mkvcbuild
 		push(@pgcommonallfiles, 'cryptohash_openssl.c');
 		push(@pgcommonallfiles, 'protocol_openssl.c');
 	}
+	elsif ($solution->{options}->{nss})
+	{
+		push(@pgcommonallfiles, 'cryptohash_nss.c');
+		push(@pgcommonallfiles, 'cipher_nss.c');
+	}
 	else
 	{
 		push(@pgcommonallfiles, 'cryptohash.c');
@@ -196,12 +201,19 @@ sub mkvcbuild
 	$postgres->FullExportDLL('postgres.lib');
 
 	# The OBJS scraper doesn't know about ifdefs, so remove appropriate files
-	# if building without OpenSSL.
-	if (!$solution->{options}->{openssl})
+	# if building without various options.
+	if (!$solution->{options}->{openssl} && !$solution->{options}->{nss})
 	{
 		$postgres->RemoveFile('src/backend/libpq/be-secure-common.c');
+	}
+	if (!$solution->{options}->{openssl})
+	{
 		$postgres->RemoveFile('src/backend/libpq/be-secure-openssl.c');
 	}
+	if (!$solution->{options}->{nss})
+	{
+		$postgres->RemoveFile('src/backend/libpq/be-secure-nss.c');
+	}
 	if (!$solution->{options}->{gss})
 	{
 		$postgres->RemoveFile('src/backend/libpq/be-gssapi-common.c');
@@ -259,12 +271,19 @@ sub mkvcbuild
 	$libpq->AddReference($libpgcommon, $libpgport);
 
 	# The OBJS scraper doesn't know about ifdefs, so remove appropriate files
-	# if building without OpenSSL.
-	if (!$solution->{options}->{openssl})
+	# if building without various options
+	if (!$solution->{options}->{openssl} && !$solution->{options}->{nss})
 	{
 		$libpq->RemoveFile('src/interfaces/libpq/fe-secure-common.c');
+	}
+	if (!$solution->{options}->{openssl})
+	{
 		$libpq->RemoveFile('src/interfaces/libpq/fe-secure-openssl.c');
 	}
+	if (!$solution->{options}->{nss})
+	{
+		$libpq->RemoveFile('src/interfaces/libpq/fe-secure-nss.c');
+	}
 	if (!$solution->{options}->{gss})
 	{
 		$libpq->RemoveFile('src/interfaces/libpq/fe-gssapi-common.c');
@@ -432,9 +451,14 @@ sub mkvcbuild
 		push @contrib_excludes, 'xml2';
 	}
 
+	if (!$solution->{options}->{openssl} && !$solution->{options}->{nss})
+	{
+		push @contrib_excludes, 'sslinfo';
+	}
+
 	if (!$solution->{options}->{openssl})
 	{
-		push @contrib_excludes, 'sslinfo', 'ssl_passphrase_callback';
+		push @contrib_excludes, 'ssl_passphrase_callback';
 	}
 
 	if (!$solution->{options}->{uuid})
@@ -464,6 +488,11 @@ sub mkvcbuild
 		$pgcrypto->AddFiles('contrib/pgcrypto', 'openssl.c',
 			'pgp-mpi-openssl.c');
 	}
+	elsif ($solution->{options}->{nss})
+	{
+		$pgcrypto->AddFiles('contrib/pgcrypto', 'nss.c',
+			'pgp-mpi-internal.c', 'imath.c', 'blf.c');
+	}
 	else
 	{
 		$pgcrypto->AddFiles(
diff --git a/src/tools/msvc/Solution.pm b/src/tools/msvc/Solution.pm
index 2aa062b2c9..0b0fbffa5e 100644
--- a/src/tools/msvc/Solution.pm
+++ b/src/tools/msvc/Solution.pm
@@ -488,6 +488,7 @@ sub GenerateFiles
 		USE_LLVM                   => undef,
 		USE_NAMED_POSIX_SEMAPHORES => undef,
 		USE_OPENSSL                => undef,
+		USE_NSS                    => undef,
 		USE_PAM                    => undef,
 		USE_SLICING_BY_8_CRC32C    => undef,
 		USE_SSE42_CRC32C           => undef,
@@ -540,6 +541,10 @@ sub GenerateFiles
 			$define{HAVE_OPENSSL_INIT_SSL}      = 1;
 		}
 	}
+	if ($self->{options}->{nss})
+	{
+		$define{USE_NSS} = 1;
+	}
 
 	$self->GenerateConfigHeader('src/include/pg_config.h',     \%define, 1);
 	$self->GenerateConfigHeader('src/include/pg_config_ext.h', \%define, 0);
@@ -1008,6 +1013,21 @@ sub AddProject
 			}
 		}
 	}
+	if ($self->{options}->{nss})
+	{
+		$proj->AddIncludeDir($self->{options}->{nss} . '\..\public\nss');
+		$proj->AddIncludeDir($self->{options}->{nss} . '\include\nspr');
+		foreach my $lib (qw(plds4 plc4 nspr4))
+		{
+			$proj->AddLibrary($self->{options}->{nss} .
+							  '\lib\lib' . "$lib.lib", 0);
+		}
+		foreach my $lib (qw(ssl3 smime3 nss3))
+		{
+			$proj->AddLibrary($self->{options}->{nss} .
+							  '\lib' . "\\$lib.dll.lib", 0);
+		}
+	}
 	if ($self->{options}->{nls})
 	{
 		$proj->AddIncludeDir($self->{options}->{nls} . '\include');
-- 
2.21.1 (Apple Git-122.3)

From 0d933420191663ed58a81d2457d423c9160fe54e Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Mon, 8 Feb 2021 23:52:51 +0100
Subject: [PATCH v26 09/10] nss: Support NSS in cryptohash

This adds support for using libnss as a crypto backend for the built-
in cryptohash support. Much of this code is similar to the pgcrypto
support.
---
 src/common/cryptohash_nss.c | 236 ++++++++++++++++++++++++++++++++++++
 1 file changed, 236 insertions(+)
 create mode 100644 src/common/cryptohash_nss.c

diff --git a/src/common/cryptohash_nss.c b/src/common/cryptohash_nss.c
new file mode 100644
index 0000000000..140d562125
--- /dev/null
+++ b/src/common/cryptohash_nss.c
@@ -0,0 +1,236 @@
+/*-------------------------------------------------------------------------
+ *
+ * cryptohash_nss.c
+ *	  Set of wrapper routines on top of NSS to support cryptographic
+ *	  hash functions.
+ *
+ * This should only be used if code is compiled with NSS support.
+ *
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ *		  src/common/cryptohash_nss.c
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#ifndef FRONTEND
+#include "postgres.h"
+#else
+#include "postgres_fe.h"
+#endif
+
+#include "common/nss.h"
+
+#include <nss/nss.h>
+#include <nss/hasht.h>
+#include <nss/pk11func.h>
+#include <nss/pk11pub.h>
+#include <nss/secitem.h>
+#include <nss/sechash.h>
+#include <nss/secoid.h>
+#include <nss/secerr.h>
+
+#include "common/cryptohash.h"
+#ifndef FRONTEND
+#include "utils/memutils.h"
+#include "utils/resowner.h"
+#include "utils/resowner_private.h"
+#endif
+
+/*
+ * In the backend, use an allocation in TopMemoryContext to count for
+ * resowner cleanup handling.  In the frontend, use malloc to be able
+ * to return a failure status back to the caller.
+ */
+#ifndef FRONTEND
+#define ALLOC(size) MemoryContextAlloc(TopMemoryContext, size)
+#define FREE(ptr) pfree(ptr)
+#else
+#define ALLOC(size) malloc(size)
+#define FREE(ptr) free(ptr)
+#endif
+
+/*
+ * Internal pg_cryptohash_ctx structure.
+ */
+struct pg_cryptohash_ctx
+{
+	pg_cryptohash_type type;
+
+	PK11Context *pk11_context;
+	HASH_HashType hash_type;
+
+#ifndef FRONTEND
+	ResourceOwner resowner;
+#endif
+};
+
+/*
+ * pg_cryptohash_create
+ *
+ * Create and allocate a new hash context. Returns NULL on failure in the
+ * frontend, and raise error without returning in the backend.
+ */
+pg_cryptohash_ctx *
+pg_cryptohash_create(pg_cryptohash_type type)
+{
+	NSSInitParameters params;
+	pg_cryptohash_ctx *ctx;
+	SECOidData *hash;
+	SECStatus status;
+
+#ifndef FRONTEND
+	/*
+	 * Make sure that the resource owner has space to remember this reference.
+	 * This can error out with "out of memory", so do this before any other
+	 * allocation to avoid leaking.
+	 */
+	ResourceOwnerEnlargeCryptoHash(CurrentResourceOwner);
+#endif
+
+	ctx = ALLOC(sizeof(pg_cryptohash_ctx));
+
+	if (!ctx)
+		goto error;
+
+	switch(type)
+	{
+		case PG_SHA1:
+			ctx->hash_type = SEC_OID_SHA1;
+			break;
+		case PG_MD5:
+			ctx->hash_type = SEC_OID_MD5;
+			break;
+		case PG_SHA224:
+			ctx->hash_type = SEC_OID_SHA224;
+			break;
+		case PG_SHA256:
+			ctx->hash_type = SEC_OID_SHA256;
+			break;
+		case PG_SHA384:
+			ctx->hash_type = SEC_OID_SHA384;
+			break;
+		case PG_SHA512:
+			ctx->hash_type = SEC_OID_SHA512;
+			break;
+	}
+
+	/*
+	 * Initialize our own NSS context without a database backing it.
+	 */
+	memset(&params, 0, sizeof(params));
+	params.length = sizeof(params);
+	status = NSS_NoDB_Init(".");
+	if (status != SECSuccess)
+	{
+		explicit_bzero(ctx, sizeof(pg_cryptohash_ctx));
+		FREE(ctx);
+		goto error;
+	}
+
+	ctx->type = type;
+	hash = SECOID_FindOIDByTag(ctx->hash_type);
+	ctx->pk11_context = PK11_CreateDigestContext(hash->offset);
+	if (!ctx->pk11_context)
+	{
+		explicit_bzero(ctx, sizeof(pg_cryptohash_ctx));
+		FREE(ctx);
+		goto error;
+	}
+
+#ifndef FRONTEND
+	ctx->resowner = CurrentResourceOwner;
+	ResourceOwnerRememberCryptoHash(CurrentResourceOwner,
+									PointerGetDatum(ctx));
+#endif
+
+	return ctx;
+
+error:
+#ifndef FRONTEND
+	ereport(ERROR,
+			(errcode(ERRCODE_OUT_OF_MEMORY),
+			 errmsg("out of memory")));
+#endif
+	return NULL;
+}
+
+/*
+ * pg_cryptohash_init
+ *			Initialize the passed hash context
+ *
+ * Returns 0 on success, -1 on failure.
+ */
+int
+pg_cryptohash_init(pg_cryptohash_ctx *ctx)
+{
+	SECStatus		status;
+
+	status = PK11_DigestBegin(ctx->pk11_context);
+
+	if (status != SECSuccess)
+		return -1;
+	return 0;
+}
+
+/*
+ * pg_cryptohash_update
+ *
+ * Update a hash context.  Returns 0 on success, -1 on failure.
+ */
+int
+pg_cryptohash_update(pg_cryptohash_ctx *ctx, const uint8 *data, size_t len)
+{
+	SECStatus	status;
+
+	if (ctx == NULL)
+		return -1;
+
+	status = PK11_DigestOp(ctx->pk11_context, data, len);
+	if (status != SECSuccess)
+		return -1;
+
+	return 0;
+}
+
+/*
+ * pg_cryptohash_final
+ *
+ * Finalize a hash context.  Returns 0 on success, -1 on failure.
+ */
+int
+pg_cryptohash_final(pg_cryptohash_ctx *ctx, uint8 *dest)
+{
+	SECStatus	status;
+	unsigned int outlen;
+	const SECHashObject *object;
+
+	object = HASH_GetHashObject(ctx->hash_type);
+	status = PK11_DigestFinal(ctx->pk11_context, dest, &outlen, object->length);
+
+	if (status != SECSuccess)
+		return -1;
+	return 0;
+}
+
+/*
+ * pg_cryptohash_free
+ *
+ * Free a hash context and the associated NSS context.
+ */
+void
+pg_cryptohash_free(pg_cryptohash_ctx *ctx)
+{
+	PRBool		free_context = PR_TRUE;
+	if (!ctx)
+		return;
+
+	PK11_DestroyContext(ctx->pk11_context, free_context);
+#ifndef FRONTEND
+	ResourceOwnerForgetCryptoHash(ctx->resowner, PointerGetDatum(ctx));
+#endif
+	explicit_bzero(ctx, sizeof(pg_cryptohash_ctx));
+	FREE(ctx);
+}
-- 
2.21.1 (Apple Git-122.3)

From 85e704dd47733aa8884f182f3b76639ca6a7fcd3 Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Mon, 8 Feb 2021 23:52:48 +0100
Subject: [PATCH v26 08/10] nss: Support NSS in sslinfo

Since sslinfo to a large extent use the be_tls_* API this mostly
disables functionality which currently is OpenSSL specific.
---
 contrib/sslinfo/sslinfo.c | 32 ++++++++++++++++++++++++++++++++
 doc/src/sgml/sslinfo.sgml | 12 +++++++++++-
 2 files changed, 43 insertions(+), 1 deletion(-)

diff --git a/contrib/sslinfo/sslinfo.c b/contrib/sslinfo/sslinfo.c
index 30cae0bb98..3aadd90aa6 100644
--- a/contrib/sslinfo/sslinfo.c
+++ b/contrib/sslinfo/sslinfo.c
@@ -9,9 +9,11 @@
 
 #include "postgres.h"
 
+#ifdef USE_OPENSSL
 #include <openssl/x509.h>
 #include <openssl/x509v3.h>
 #include <openssl/asn1.h>
+#endif
 
 #include "access/htup_details.h"
 #include "funcapi.h"
@@ -21,6 +23,7 @@
 
 PG_MODULE_MAGIC;
 
+#ifdef USE_OPENSSL
 static Datum X509_NAME_field_to_text(X509_NAME *name, text *fieldName);
 static Datum ASN1_STRING_to_text(ASN1_STRING *str);
 
@@ -31,6 +34,7 @@ typedef struct
 {
 	TupleDesc	tupdesc;
 } SSLExtensionInfoContext;
+#endif
 
 /*
  * Indicates whether current session uses SSL
@@ -131,6 +135,7 @@ ssl_client_serial(PG_FUNCTION_ARGS)
 }
 
 
+#ifdef USE_OPENSSL
 /*
  * Converts OpenSSL ASN1_STRING structure into text
  *
@@ -282,7 +287,23 @@ ssl_issuer_field(PG_FUNCTION_ARGS)
 	else
 		return result;
 }
+#endif							/* USE_OPENSSL */
 
+#ifdef USE_NSS
+PG_FUNCTION_INFO_V1(ssl_client_dn_field);
+Datum
+ssl_client_dn_field(PG_FUNCTION_ARGS)
+{
+	PG_RETURN_NULL();
+}
+
+PG_FUNCTION_INFO_V1(ssl_issuer_field);
+Datum
+ssl_issuer_field(PG_FUNCTION_ARGS)
+{
+	PG_RETURN_NULL();
+}
+#endif							/* USE_NSS */
 
 /*
  * Returns current client certificate subject as one string
@@ -338,6 +359,7 @@ ssl_issuer_dn(PG_FUNCTION_ARGS)
 }
 
 
+#ifdef USE_OPENSSL
 /*
  * Returns information about available SSL extensions.
  *
@@ -471,3 +493,13 @@ ssl_extension_info(PG_FUNCTION_ARGS)
 	/* All done */
 	SRF_RETURN_DONE(funcctx);
 }
+#endif							/* USE_OPENSSL */
+
+#ifdef USE_NSS
+PG_FUNCTION_INFO_V1(ssl_extension_info);
+Datum
+ssl_extension_info(PG_FUNCTION_ARGS)
+{
+	PG_RETURN_NULL();
+}
+#endif							/* USE_NSS */
diff --git a/doc/src/sgml/sslinfo.sgml b/doc/src/sgml/sslinfo.sgml
index 2a9c45a111..f3ae2fc3b8 100644
--- a/doc/src/sgml/sslinfo.sgml
+++ b/doc/src/sgml/sslinfo.sgml
@@ -22,7 +22,8 @@
 
  <para>
   This extension won't build at all unless the installation was
-  configured with <literal>--with-ssl=openssl</literal>.
+  configured with SSL support, such as <literal>--with-ssl=openssl</literal>
+  or <literal>--with-ssl=nss</literal>.
  </para>
 
  <sect2>
@@ -208,6 +209,9 @@ emailAddress
      the X.500 and X.509 standards, so you cannot just assign arbitrary
      meaning to them.
     </para>
+    <para>
+     This function is only available when using <productname>OpenSSL</productname>.
+    </para>
     </listitem>
    </varlistentry>
 
@@ -223,6 +227,9 @@ emailAddress
      Same as <function>ssl_client_dn_field</function>, but for the certificate issuer
      rather than the certificate subject.
     </para>
+    <para>
+     This function is only available when using <productname>OpenSSL</productname>.
+    </para>
     </listitem>
    </varlistentry>
 
@@ -238,6 +245,9 @@ emailAddress
      Provide information about extensions of client certificate: extension name,
      extension value, and if it is a critical extension.
     </para>
+    <para>
+     This function is only available when using <productname>OpenSSL</productname>.
+    </para>
     </listitem>
    </varlistentry>
   </variablelist>
-- 
2.21.1 (Apple Git-122.3)

From 544cde3f968341e3ff3ce7ddac6b07783260cfde Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Mon, 8 Feb 2021 23:52:45 +0100
Subject: [PATCH v26 07/10] nss: Support NSS in pgcrypto

This extends pgcrypto to be able to use libnss as a cryptographic
backend for pgcrypto much like how OpenSSL is a supported backend.
Blowfish is not a supported cipher in NSS, so the implementation
falls back on the built-in BF code to be compatible in terms of
cipher support.
---
 contrib/pgcrypto/Makefile  |   7 +-
 contrib/pgcrypto/nss.c     | 753 +++++++++++++++++++++++++++++++++++++
 doc/src/sgml/pgcrypto.sgml |  38 +-
 3 files changed, 787 insertions(+), 11 deletions(-)
 create mode 100644 contrib/pgcrypto/nss.c

diff --git a/contrib/pgcrypto/Makefile b/contrib/pgcrypto/Makefile
index c0b4f1fcf6..ede7a78146 100644
--- a/contrib/pgcrypto/Makefile
+++ b/contrib/pgcrypto/Makefile
@@ -7,11 +7,14 @@ INT_TESTS = sha2
 OSSL_SRCS = openssl.c pgp-mpi-openssl.c
 OSSL_TESTS = sha2 des 3des cast5
 
+NSS_SRCS = nss.c pgp-mpi-internal.c imath.c blf.c
+NSS_TESTS = sha2 des 3des
+
 ZLIB_TST = pgp-compression
 ZLIB_OFF_TST = pgp-zlib-DISABLED
 
-CF_SRCS = $(if $(subst openssl,,$(with_ssl)), $(INT_SRCS), $(OSSL_SRCS))
-CF_TESTS = $(if $(subst openssl,,$(with_ssl)), $(INT_TESTS), $(OSSL_TESTS))
+CF_SRCS = $(if $(findstring openssl, $(with_ssl)), $(OSSL_SRCS), $(if $(findstring nss, $(with_ssl)), $(NSS_SRCS), $(INT_SRCS)))
+CF_TESTS = $(if $(findstring openssl, $(with_ssl)), $(OSSL_TESTS), $(if $(findstring nss, $(with_ssl)), $(NSS_TESTS), $(INT_TESTS)))
 CF_PGP_TESTS = $(if $(subst no,,$(with_zlib)), $(ZLIB_TST), $(ZLIB_OFF_TST))
 
 SRCS = \
diff --git a/contrib/pgcrypto/nss.c b/contrib/pgcrypto/nss.c
new file mode 100644
index 0000000000..d4fd4680ec
--- /dev/null
+++ b/contrib/pgcrypto/nss.c
@@ -0,0 +1,753 @@
+/*-------------------------------------------------------------------------
+ *
+ * nss.c
+ *	  Wrapper for using NSS as a backend for pgcrypto PX
+ *
+ *
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ *	  contrib/pgcrypto/nss.c
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#include "postgres.h"
+
+#include "px.h"
+#include "blf.h"
+#include "common/nss.h"
+#include "utils/memutils.h"
+
+#include <nss/nss.h>
+#include <nss/hasht.h>
+#include <nss/pk11func.h>
+#include <nss/pk11pub.h>
+#include <nss/secitem.h>
+#include <nss/sechash.h>
+#include <nss/secoid.h>
+#include <nss/secerr.h>
+
+/*
+ * Define our own mechanisms for Blowfish as it's not implemented by NSS.
+ */
+#define BLOWFISH_CBC	(1)
+#define BLOWFISH_ECB	(2)
+
+/*
+ * Data structures for recording cipher implementations as well as ongoing
+ * cipher operations.
+ */
+typedef struct nss_digest
+{
+	NSSInitContext *context;
+	PK11Context *hash_context;
+	HASH_HashType hash_type;
+}			nss_digest;
+
+typedef struct cipher_implementation
+{
+	/* Function pointers to cipher operations */
+	int			(*init) (PX_Cipher *pxc, const uint8 *key, unsigned klen, const uint8 *iv);
+	unsigned	(*get_block_size) (PX_Cipher *pxc);
+	unsigned	(*get_key_size) (PX_Cipher *pxc);
+	unsigned	(*get_iv_size) (PX_Cipher *pxc);
+	int			(*encrypt) (PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res);
+	int			(*decrypt) (PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res);
+	void		(*free) (PX_Cipher *pxc);
+
+	/* The mechanism describing the cipher used */
+	union
+	{
+		CK_MECHANISM_TYPE nss;
+		CK_ULONG	internal;
+	}			mechanism;
+	int			keylen;
+	bool		is_nss;
+}			cipher_implementation;
+
+typedef struct nss_cipher
+{
+	const cipher_implementation *impl;
+	NSSInitContext *context;
+	PK11Context *crypt_context;
+	SECItem    *params;
+
+	PK11SymKey *encrypt_key;
+	PK11SymKey *decrypt_key;
+}			nss_cipher;
+
+typedef struct internal_cipher
+{
+	const cipher_implementation *impl;
+	BlowfishContext context;
+}			internal_cipher;
+
+typedef struct nss_cipher_ref
+{
+	const char *name;
+	const cipher_implementation *impl;
+}			nss_cipher_ref;
+
+/*
+ * Prototypes
+ */
+static unsigned nss_get_iv_size(PX_Cipher *pxc);
+static unsigned nss_get_block_size(PX_Cipher *pxc);
+
+/*
+ * nss_GetHashOidTagByHashType
+ *
+ * Returns the corresponding SECOidTag for the passed hash type. NSS 3.43
+ * includes HASH_GetHashOidTagByHashType for this purpose, but at the time of
+ * writing is not commonly available so we need our own version till then.
+ */
+static SECOidTag
+nss_GetHashOidTagByHashType(HASH_HashType type)
+{
+	if (type == HASH_AlgMD2)
+		return SEC_OID_MD2;
+	if (type == HASH_AlgMD5)
+		return SEC_OID_MD5;
+	if (type == HASH_AlgSHA1)
+		return SEC_OID_SHA1;
+	if (type == HASH_AlgSHA224)
+		return SEC_OID_SHA224;
+	if (type == HASH_AlgSHA256)
+		return SEC_OID_SHA256;
+	if (type == HASH_AlgSHA384)
+		return SEC_OID_SHA384;
+	if (type == HASH_AlgSHA512)
+		return SEC_OID_SHA512;
+
+	return SEC_OID_UNKNOWN;
+}
+
+static unsigned
+nss_digest_block_size(PX_MD *pxmd)
+{
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+	const SECHashObject *object;
+
+	object = HASH_GetHashObject(digest->hash_type);
+	return object->blocklength;
+}
+
+static unsigned
+nss_digest_result_size(PX_MD *pxmd)
+{
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+	const SECHashObject *object;
+
+	object = HASH_GetHashObject(digest->hash_type);
+	return object->length;
+}
+
+static void
+nss_digest_free(PX_MD *pxmd)
+{
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+	PRBool		free_ctx = PR_TRUE;
+
+	PK11_DestroyContext(digest->hash_context, free_ctx);
+	NSS_ShutdownContext(digest->context);
+}
+
+static void
+nss_digest_update(PX_MD *pxmd, const uint8 *data, unsigned dlen)
+{
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+
+	PK11_DigestOp(digest->hash_context, data, dlen);
+}
+
+static void
+nss_digest_reset(PX_MD *pxmd)
+{
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+
+	PK11_DigestBegin(digest->hash_context);
+}
+
+static void
+nss_digest_finish(PX_MD *pxmd, uint8 *dst)
+{
+	unsigned int outlen;
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+	const SECHashObject *object;
+
+	object = HASH_GetHashObject(digest->hash_type);
+	PK11_DigestFinal(digest->hash_context, dst, &outlen, object->length);
+}
+
+int
+px_find_digest(const char *name, PX_MD **res)
+{
+	PX_MD	   *pxmd;
+	NSSInitParameters params;
+	NSSInitContext *nss_context;
+	bool		found = false;
+	nss_digest *digest;
+	SECStatus	status;
+	SECOidData *hash;
+	HASH_HashType t;
+
+	/*
+	 * Initialize our own NSS context without a database backing it.
+	 */
+	memset(&params, 0, sizeof(params));
+	params.length = sizeof(params);
+	nss_context = NSS_InitContext("", "", "", "", &params,
+								  NSS_INIT_READONLY | NSS_INIT_NOCERTDB |
+								  NSS_INIT_NOMODDB | NSS_INIT_FORCEOPEN |
+								  NSS_INIT_NOROOTINIT | NSS_INIT_PK11RELOAD);
+
+	/*
+	 * There is no API function for looking up a digest algorithm from a name
+	 * string, but there is a publicly accessible array which can be scanned
+	 * for the name.
+	 */
+	for (t = HASH_AlgNULL + 1; t < HASH_AlgTOTAL; t++)
+	{
+		SECOidTag	hash_oid;
+		char	   *p;
+
+		hash_oid = nss_GetHashOidTagByHashType(t);
+
+		if (hash_oid == SEC_OID_UNKNOWN)
+			return PXE_NO_HASH;
+
+		hash = SECOID_FindOIDByTag(hash_oid);
+		if (pg_strcasecmp(hash->desc, name) == 0)
+		{
+			found = true;
+			break;
+		}
+
+		/*
+		 * NSS saves the algorithm names using SHA-xxx notation whereas
+		 * OpenSSL use SHAxxx. To make sure the user finds the requested
+		 * algorithm let's remove the dash and compare that spelling as well.
+		 */
+		if ((p = strchr(hash->desc, '-')) != NULL)
+		{
+			char		tmp[12];
+
+			memcpy(tmp, hash->desc, p - hash->desc);
+			memcpy(tmp + (p - hash->desc), p + 1, strlen(hash->desc) - (p - hash->desc) + 1);
+			if (pg_strcasecmp(tmp, name) == 0)
+			{
+				found = true;
+				break;
+			}
+		}
+	}
+
+	if (!found)
+		return PXE_NO_HASH;
+
+	digest = palloc(sizeof(*digest));
+
+	digest->context = nss_context;
+	digest->hash_context = PK11_CreateDigestContext(hash->offset);
+	digest->hash_type = t;
+	if (digest->hash_context == NULL)
+	{
+		pfree(digest);
+		return -1;
+	}
+
+	status = PK11_DigestBegin(digest->hash_context);
+	if (status != SECSuccess)
+	{
+		PK11_DestroyContext(digest->hash_context, PR_TRUE);
+		pfree(digest);
+		return -1;
+	}
+
+	pxmd = palloc(sizeof(*pxmd));
+	pxmd->result_size = nss_digest_result_size;
+	pxmd->block_size = nss_digest_block_size;
+	pxmd->reset = nss_digest_reset;
+	pxmd->update = nss_digest_update;
+	pxmd->finish = nss_digest_finish;
+	pxmd->free = nss_digest_free;
+	pxmd->p.ptr = (void *) digest;
+
+	*res = pxmd;
+
+	return 0;
+}
+
+static int
+bf_init(PX_Cipher *pxc, const uint8 *key, unsigned klen, const uint8 *iv)
+{
+	internal_cipher *cipher = (internal_cipher *) pxc->ptr;
+
+	blowfish_setkey(&cipher->context, key, klen);
+	if (iv)
+		blowfish_setiv(&cipher->context, iv);
+
+	return 0;
+}
+
+static int
+bf_encrypt(PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res)
+{
+	internal_cipher *cipher = (internal_cipher *) pxc->ptr;
+	uint8	   *buf;
+
+	if (dlen == 0)
+		return 0;
+
+	if (dlen & 7)
+		return PXE_NOTBLOCKSIZE;
+
+	buf = palloc(dlen);
+	memcpy(buf, data, dlen);
+
+	if (cipher->impl->mechanism.internal == BLOWFISH_ECB)
+		blowfish_encrypt_ecb(buf, dlen, &cipher->context);
+	else
+		blowfish_encrypt_cbc(buf, dlen, &cipher->context);
+
+	memcpy(res, buf, dlen);
+	pfree(buf);
+
+	return 0;
+}
+
+static int
+bf_decrypt(PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res)
+{
+	internal_cipher *cipher = (internal_cipher *) pxc->ptr;
+
+	if (dlen == 0)
+		return 0;
+
+	if (dlen & 7)
+		return PXE_NOTBLOCKSIZE;
+
+	memcpy(res, data, dlen);
+	if (cipher->impl->mechanism.internal == BLOWFISH_ECB)
+		blowfish_decrypt_ecb(res, dlen, &cipher->context);
+	else
+		blowfish_decrypt_cbc(res, dlen, &cipher->context);
+
+	return 0;
+}
+
+static void
+bf_free(PX_Cipher *pxc)
+{
+	internal_cipher *cipher = (internal_cipher *) pxc->ptr;
+
+	pfree(cipher);
+	pfree(pxc);
+}
+
+static int
+nss_symkey_blockcipher_init(PX_Cipher *pxc, const uint8 *key, unsigned klen,
+							const uint8 *iv)
+{
+	nss_cipher *cipher = (nss_cipher *) pxc->ptr;
+	SECItem		iv_item;
+	unsigned char *iv_item_data;
+	SECItem		key_item;
+	int			keylen;
+	PK11SlotInfo *slot;
+
+	if (cipher->impl->mechanism.nss == CKM_AES_CBC ||
+		cipher->impl->mechanism.nss == CKM_AES_ECB)
+	{
+		if (klen <= 128 / 8)
+			keylen = 128 / 8;
+		else if (klen <= 192 / 8)
+			keylen = 192 / 8;
+		else if (klen <= 256 / 8)
+			keylen = 256 / 8;
+		else
+			return PXE_CIPHER_INIT;
+	}
+	else
+		keylen = cipher->impl->keylen;
+
+	key_item.type = siBuffer;
+	key_item.data = (unsigned char *) key;
+	key_item.len = keylen;
+
+	/*
+	 * If hardware acceleration is configured in NSS one can theoretically get
+	 * a better slot by calling PK11_GetBestSlot() with the mechanism passed
+	 * to it. Unless there are complaints, using the simpler API will make
+	 * error handling easier though.
+	 */
+	slot = PK11_GetInternalSlot();
+	if (!slot)
+		return PXE_CIPHER_INIT;
+
+	/*
+	 * The key must be set up for the operation, and since we don't know at
+	 * this point whether we are asked to encrypt or decrypt we need to store
+	 * both versions.
+	 */
+	cipher->decrypt_key = PK11_ImportSymKey(slot, cipher->impl->mechanism.nss,
+											PK11_OriginUnwrap,
+											CKA_DECRYPT, &key_item,
+											NULL);
+	cipher->encrypt_key = PK11_ImportSymKey(slot, cipher->impl->mechanism.nss,
+											PK11_OriginUnwrap,
+											CKA_ENCRYPT, &key_item,
+											NULL);
+	PK11_FreeSlot(slot);
+
+	if (!cipher->decrypt_key || !cipher->encrypt_key)
+		return PXE_CIPHER_INIT;
+
+	if (iv)
+	{
+		iv_item.type = siBuffer;
+		iv_item.data = (unsigned char *) iv;
+		iv_item.len = nss_get_iv_size(pxc);
+	}
+	else
+	{
+		/*
+		 * The documentation states that either passing .data = 0; .len = 0;
+		 * in the iv_item, or NULL as iv_item, to PK11_ParamFromIV should be
+		 * done when IV is missing. That however leads to segfaults in the
+		 * library, the workaround that works in modern  library versions is
+		 * to pass in a keysized zeroed out IV.
+		 */
+		iv_item_data = palloc0(nss_get_iv_size(pxc));
+		iv_item.type = siBuffer;
+		iv_item.data = iv_item_data;
+		iv_item.len = nss_get_iv_size(pxc);
+	}
+
+	cipher->params = PK11_ParamFromIV(cipher->impl->mechanism.nss, &iv_item);
+
+	/* If we had to make a mock IV, free it once made into a param */
+	if (!iv)
+		pfree(iv_item_data);
+
+	if (cipher->params == NULL)
+		return PXE_CIPHER_INIT;
+
+	return 0;
+}
+
+static int
+nss_decrypt(PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res)
+{
+	nss_cipher *cipher = (nss_cipher *) pxc->ptr;
+	SECStatus	status;
+	int			outlen;
+
+	if (!cipher->crypt_context)
+	{
+		cipher->crypt_context =
+			PK11_CreateContextBySymKey(cipher->impl->mechanism.nss, CKA_DECRYPT,
+									   cipher->decrypt_key, cipher->params);
+	}
+
+	status = PK11_CipherOp(cipher->crypt_context, res, &outlen, dlen, data, dlen);
+	if (status != SECSuccess)
+		return PXE_DECRYPT_FAILED;
+
+	return 0;
+}
+
+static int
+nss_encrypt(PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res)
+{
+	nss_cipher *cipher = (nss_cipher *) pxc->ptr;
+	SECStatus	status;
+	int			outlen;
+
+	if (!cipher->crypt_context)
+	{
+		cipher->crypt_context =
+			PK11_CreateContextBySymKey(cipher->impl->mechanism.nss, CKA_ENCRYPT,
+									   cipher->decrypt_key, cipher->params);
+	}
+
+	status = PK11_CipherOp(cipher->crypt_context, res, &outlen, dlen, data, dlen);
+
+	if (status != SECSuccess)
+		return PXE_DECRYPT_FAILED;
+
+	return 0;
+}
+
+static void
+nss_free(PX_Cipher *pxc)
+{
+	nss_cipher *cipher = pxc->ptr;
+	PRBool		free_ctx = PR_TRUE;
+
+	PK11_FreeSymKey(cipher->encrypt_key);
+	PK11_FreeSymKey(cipher->decrypt_key);
+	PK11_DestroyContext(cipher->crypt_context, free_ctx);
+	NSS_ShutdownContext(cipher->context);
+	pfree(cipher);
+
+	pfree(pxc);
+}
+
+static unsigned
+nss_get_block_size(PX_Cipher *pxc)
+{
+	nss_cipher *cipher = pxc->ptr;
+
+	return PK11_GetBlockSize(cipher->impl->mechanism.nss, NULL);
+}
+
+static unsigned
+nss_get_key_size(PX_Cipher *pxc)
+{
+	nss_cipher *cipher = pxc->ptr;
+
+	return cipher->impl->keylen;
+}
+
+static unsigned
+nss_get_iv_size(PX_Cipher *pxc)
+{
+	nss_cipher *cipher = pxc->ptr;
+
+	return PK11_GetIVLength(cipher->impl->mechanism.nss);
+}
+
+static unsigned
+bf_get_block_size(PX_Cipher *pxc)
+{
+	return 8;
+}
+
+static unsigned
+bf_get_key_size(PX_Cipher *pxc)
+{
+	return 448 / 8;
+}
+
+static unsigned
+bf_get_iv_size(PX_Cipher *pxc)
+{
+	return 8;
+}
+
+/*
+ * Cipher Implementations
+ */
+static const cipher_implementation nss_des_cbc = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_DES_CBC,
+	.keylen = 8,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_des_ecb = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_DES_ECB,
+	.keylen = 8,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_des3_cbc = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_DES3_CBC,
+	.keylen = 24,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_des3_ecb = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_DES3_ECB,
+	.keylen = 24,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_aes_cbc = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_AES_CBC,
+	.keylen = 32,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_aes_ecb = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_AES_ECB,
+	.keylen = 32,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_bf_ecb = {
+	.init = bf_init,
+	.get_block_size = bf_get_block_size,
+	.get_key_size = bf_get_key_size,
+	.get_iv_size = bf_get_iv_size,
+	.encrypt = bf_encrypt,
+	.decrypt = bf_decrypt,
+	.free = bf_free,
+	.mechanism.internal = BLOWFISH_ECB,
+	.keylen = 56,
+	.is_nss = false
+};
+
+static const cipher_implementation nss_bf_cbc = {
+	.init = bf_init,
+	.get_block_size = bf_get_block_size,
+	.get_key_size = bf_get_key_size,
+	.get_iv_size = bf_get_iv_size,
+	.encrypt = bf_encrypt,
+	.decrypt = bf_decrypt,
+	.free = bf_free,
+	.mechanism.internal = BLOWFISH_CBC,
+	.keylen = 56,
+	.is_nss = false
+};
+
+/*
+ * Lookup table for finding the implementation based on a name. CAST5 as well
+ * as BLOWFISH are defined as cipher mechanisms in NSS but error out with
+ * SEC_ERROR_INVALID_ALGORITHM. Blowfish is implemented using the internal
+ * implementation while CAST5 isn't supported at all at this time,
+ */
+static const nss_cipher_ref nss_cipher_lookup[] = {
+	{"des", &nss_des_cbc},
+	{"des-cbc", &nss_des_cbc},
+	{"des-ecb", &nss_des_ecb},
+	{"des3-cbc", &nss_des3_cbc},
+	{"3des", &nss_des3_cbc},
+	{"3des-cbc", &nss_des3_cbc},
+	{"des3-ecb", &nss_des3_ecb},
+	{"3des-ecb", &nss_des3_ecb},
+	{"aes", &nss_aes_cbc},
+	{"aes-cbc", &nss_aes_cbc},
+	{"aes-ecb", &nss_aes_ecb},
+	{"rijndael", &nss_aes_cbc},
+	{"rijndael-cbc", &nss_aes_cbc},
+	{"rijndael-ecb", &nss_aes_ecb},
+	{"blowfish", &nss_bf_cbc},
+	{"blowfish-cbc", &nss_bf_cbc},
+	{"blowfish-ecb", &nss_bf_ecb},
+	{"bf", &nss_bf_cbc},
+	{"bf-cbc", &nss_bf_cbc},
+	{"bf-ecb", &nss_bf_ecb},
+	{NULL}
+};
+
+/*
+ * px_find_cipher
+ *
+ * Search for the requested cipher and see if there is support for it, and if
+ * so return an allocated object containing the playbook for how to encrypt
+ * and decrypt using the cipher.
+ */
+int
+px_find_cipher(const char *alias, PX_Cipher **res)
+{
+	const nss_cipher_ref *cipher_ref;
+	PX_Cipher  *px_cipher;
+	NSSInitParameters params;
+	NSSInitContext *nss_context;
+	nss_cipher *cipher;
+	internal_cipher *int_cipher;
+
+	for (cipher_ref = nss_cipher_lookup; cipher_ref->name; cipher_ref++)
+	{
+		if (strcmp(cipher_ref->name, alias) == 0)
+			break;
+	}
+
+	if (!cipher_ref->name)
+		return PXE_NO_CIPHER;
+
+	/*
+	 * Fill in the PX_Cipher to pass back to PX describing the operations to
+	 * perform in order to use the cipher.
+	 */
+	px_cipher = palloc(sizeof(*px_cipher));
+	px_cipher->block_size = cipher_ref->impl->get_block_size;
+	px_cipher->key_size = cipher_ref->impl->get_key_size;
+	px_cipher->iv_size = cipher_ref->impl->get_iv_size;
+	px_cipher->free = cipher_ref->impl->free;
+	px_cipher->init = cipher_ref->impl->init;
+	px_cipher->encrypt = cipher_ref->impl->encrypt;
+	px_cipher->decrypt = cipher_ref->impl->decrypt;
+
+	/*
+	 * Set the private data, which is different for NSS and internal ciphers
+	 */
+	if (cipher_ref->impl->is_nss)
+	{
+		/*
+		 * Initialize our own NSS context without a database backing it. At
+		 * some point we might want to allow users to use stored keys in the
+		 * database rather than passing them via SELECT encrypt(), and then
+		 * this need to be changed to open a user specified database.
+		 */
+		memset(&params, 0, sizeof(params));
+		params.length = sizeof(params);
+		nss_context = NSS_InitContext("", "", "", "", &params,
+									  NSS_INIT_READONLY | NSS_INIT_NOCERTDB |
+									  NSS_INIT_NOMODDB | NSS_INIT_FORCEOPEN |
+									  NSS_INIT_NOROOTINIT | NSS_INIT_PK11RELOAD);
+
+		/* nss_cipher is the private state struct for the operation */
+		cipher = palloc(sizeof(*cipher));
+		cipher->context = nss_context;
+		cipher->impl = cipher_ref->impl;
+		cipher->crypt_context = NULL;
+
+		px_cipher->ptr = cipher;
+	}
+	else
+	{
+		int_cipher = palloc0(sizeof(*int_cipher));
+
+		int_cipher->impl = cipher_ref->impl;
+		px_cipher->ptr = int_cipher;
+	}
+
+	*res = px_cipher;
+	return 0;
+}
diff --git a/doc/src/sgml/pgcrypto.sgml b/doc/src/sgml/pgcrypto.sgml
index b6bb23de0f..bf486f0c07 100644
--- a/doc/src/sgml/pgcrypto.sgml
+++ b/doc/src/sgml/pgcrypto.sgml
@@ -45,8 +45,9 @@ digest(data bytea, type text) returns bytea
     <literal>sha224</literal>, <literal>sha256</literal>,
     <literal>sha384</literal> and <literal>sha512</literal>.
     If <filename>pgcrypto</filename> was built with
-    <productname>OpenSSL</productname>, more algorithms are available, as
-    detailed in <xref linkend="pgcrypto-with-without-openssl"/>.
+    <productname>OpenSSL</productname> or <productname>NSS</productname>,
+    more algorithms are available, as
+    detailed in <xref linkend="pgcrypto-with-without-openssl-nss"/>.
    </para>
 
    <para>
@@ -764,7 +765,7 @@ pgp_sym_encrypt(data, psw, 'compress-algo=1, cipher-algo=aes256')
     Which cipher algorithm to use.
    </para>
 <literallayout>
-Values: bf, aes128, aes192, aes256 (OpenSSL-only: <literal>3des</literal>, <literal>cast5</literal>)
+Values: bf, aes128, aes192, aes256 (OpenSSL-only: <literal>3des</literal>, <literal>cast5</literal>; NSS-only: <literal>3des</literal>)
 Default: aes128
 Applies to: pgp_sym_encrypt, pgp_pub_encrypt
 </literallayout>
@@ -1153,8 +1154,8 @@ gen_random_uuid() returns uuid
    <para>
     <filename>pgcrypto</filename> configures itself according to the findings of the
     main PostgreSQL <literal>configure</literal> script.  The options that
-    affect it are <literal>--with-zlib</literal> and
-    <literal>--with-ssl=openssl</literal>.
+    affect it are <literal>--with-zlib</literal>,
+    <literal>--with-ssl=openssl</literal> and <literal>--with-ssl=nss</literal>.
    </para>
 
    <para>
@@ -1169,14 +1170,16 @@ gen_random_uuid() returns uuid
     BIGNUM functions.
    </para>
 
-   <table id="pgcrypto-with-without-openssl">
-    <title>Summary of Functionality with and without OpenSSL</title>
-    <tgroup cols="3">
+   <table id="pgcrypto-with-without-openssl-nss">
+    <title>Summary of Functionality with and without external cryptographic
+      library</title>
+    <tgroup cols="4">
      <thead>
       <row>
        <entry>Functionality</entry>
        <entry>Built-in</entry>
        <entry>With OpenSSL</entry>
+       <entry>With NSS</entry>
       </row>
      </thead>
      <tbody>
@@ -1184,51 +1187,67 @@ gen_random_uuid() returns uuid
        <entry>MD5</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>SHA1</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>SHA224/256/384/512</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>Other digest algorithms</entry>
        <entry>no</entry>
        <entry>yes (Note 1)</entry>
+       <entry>yes (Note 1)</entry>
       </row>
       <row>
        <entry>Blowfish</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>AES</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>DES/3DES/CAST5</entry>
        <entry>no</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
+      </row>
+      <row>
+       <entry>CAST5</entry>
+       <entry>no</entry>
+       <entry>yes</entry>
+       <entry>no</entry>
       </row>
       <row>
        <entry>Raw encryption</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>PGP Symmetric encryption</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>PGP Public-Key encryption</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
      </tbody>
     </tgroup>
@@ -1241,7 +1260,8 @@ gen_random_uuid() returns uuid
    <orderedlist>
     <listitem>
      <para>
-      Any digest algorithm <productname>OpenSSL</productname> supports
+      Any digest algorithm <productname>OpenSSL</productname> and
+      <productname>NSS</productname> supports
       is automatically picked up.
       This is not possible with ciphers, which need to be supported
       explicitly.
-- 
2.21.1 (Apple Git-122.3)

From 97da1c020bfd04448e065d87a12c876b57538638 Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Mon, 8 Feb 2021 23:52:42 +0100
Subject: [PATCH v26 06/10] nss: Documentation

Basic documentation of the new API (keypass hooks) as well as config
parameters and installation. Additionally there is a section on how
to create certificate and keys using the NSS toolchain.
---
 doc/src/sgml/acronyms.sgml     |  43 ++++++++++++
 doc/src/sgml/config.sgml       |  28 +++++++-
 doc/src/sgml/installation.sgml |  31 ++++++---
 doc/src/sgml/libpq.sgml        |  97 +++++++++++++++++++++++++-
 doc/src/sgml/runtime.sgml      | 123 +++++++++++++++++++++++++++++++--
 5 files changed, 303 insertions(+), 19 deletions(-)

diff --git a/doc/src/sgml/acronyms.sgml b/doc/src/sgml/acronyms.sgml
index 4e5ec983c0..7b02c8a622 100644
--- a/doc/src/sgml/acronyms.sgml
+++ b/doc/src/sgml/acronyms.sgml
@@ -441,6 +441,28 @@
     </listitem>
    </varlistentry>
 
+   <varlistentry>
+    <term><acronym>NSPR</acronym></term>
+    <listitem>
+     <para>
+      <ulink
+      url="https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSPR">
+      Netscape Portable Runtime</ulink>
+     </para>
+    </listitem>
+   </varlistentry>
+
+   <varlistentry>
+    <term><acronym>NSS</acronym></term>
+    <listitem>
+     <para>
+      <ulink
+      url="https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS">
+      Network Security Services</ulink>
+     </para>
+    </listitem>
+   </varlistentry>
+
    <varlistentry>
     <term><acronym>ODBC</acronym></term>
     <listitem>
@@ -539,6 +561,17 @@
     </listitem>
    </varlistentry>
 
+   <varlistentry>
+    <term><acronym>PKCS#12</acronym></term>
+    <listitem>
+     <para>
+      <ulink
+      url="https://en.wikipedia.org/wiki/PKCS_12">
+      Public-Key Cryptography Standards #12</ulink>
+     </para>
+    </listitem>
+   </varlistentry>
+
    <varlistentry>
     <term><acronym>PL</acronym></term>
     <listitem>
@@ -684,6 +717,16 @@
     </listitem>
    </varlistentry>
 
+   <varlistentry>
+    <term><acronym>TLS</acronym></term>
+    <listitem>
+     <para>
+      <ulink url="https://en.wikipedia.org/wiki/Transport_Layer_Security">
+      Transport Layer Security</ulink>
+     </para>
+    </listitem>
+   </varlistentry>
+
    <varlistentry>
     <term><acronym>TOAST</acronym></term>
     <listitem>
diff --git a/doc/src/sgml/config.sgml b/doc/src/sgml/config.sgml
index 5ef1c7ad3c..5482d83e65 100644
--- a/doc/src/sgml/config.sgml
+++ b/doc/src/sgml/config.sgml
@@ -1238,6 +1238,23 @@ include_dir 'conf.d'
       </listitem>
      </varlistentry>
 
+     <varlistentry id="guc-ssl-database" xreflabel="ssl_database">
+      <term><varname>ssl_database</varname> (<type>string</type>)
+      <indexterm>
+       <primary><varname>ssl_database</varname> configuration parameter</primary>
+      </indexterm>
+      </term>
+      <listitem>
+       <para>
+        Specifies the name of the file containing the server certificates and
+        keys when using <productname>NSS</productname> for <acronym>SSL</acronym>
+        connections. This parameter can only be set in the
+        <filename>postgresql.conf</filename> file or on the server command
+        line.
+       </para>
+      </listitem>
+     </varlistentry>
+
      <varlistentry id="guc-ssl-ciphers" xreflabel="ssl_ciphers">
       <term><varname>ssl_ciphers</varname> (<type>string</type>)
       <indexterm>
@@ -1254,7 +1271,9 @@ include_dir 'conf.d'
         connections using TLS version 1.2 and lower are affected.  There is
         currently no setting that controls the cipher choices used by TLS
         version 1.3 connections.  The default value is
-        <literal>HIGH:MEDIUM:+3DES:!aNULL</literal>.  The default is usually a
+        <literal>HIGH:MEDIUM:+3DES:!aNULL</literal> for servers which have
+        been built with <productname>OpenSSL</productname> as the
+        <acronym>SSL</acronym> library.  The default is usually a
         reasonable choice unless you have specific security requirements.
        </para>
 
@@ -1456,8 +1475,11 @@ include_dir 'conf.d'
        <para>
         Sets an external command to be invoked when a passphrase for
         decrypting an SSL file such as a private key needs to be obtained.  By
-        default, this parameter is empty, which means the built-in prompting
-        mechanism is used.
+        default, this parameter is empty. When the server is using
+        <productname>OpenSSL</productname>, this means the built-in prompting
+        mechanism is used. When using <productname>NSS</productname>, there is
+        no default prompting so a blank callback will be used returning an
+        empty password.
        </para>
        <para>
         The command must print the passphrase to the standard output and exit
diff --git a/doc/src/sgml/installation.sgml b/doc/src/sgml/installation.sgml
index 66ad4ba938..1b71881c6e 100644
--- a/doc/src/sgml/installation.sgml
+++ b/doc/src/sgml/installation.sgml
@@ -976,15 +976,30 @@ build-postgresql:
        <listitem>
         <para>
          Build with support for <acronym>SSL</acronym> (encrypted)
-         connections. The only <replaceable>LIBRARY</replaceable>
-         supported is <option>openssl</option>. This requires the
-         <productname>OpenSSL</productname> package to be installed.
-         <filename>configure</filename> will check for the required
-         header files and libraries to make sure that your
-         <productname>OpenSSL</productname> installation is sufficient
-         before proceeding. 
+         connections. <replaceable>LIBRARY</replaceable> must be one of:
         </para>
-       </listitem>
+        <itemizedlist>
+         <listitem>
+          <para>
+           <option>openssl</option> to build with <productname>OpenSSL</productname> support.
+            This requires the <productname>OpenSSL</productname>
+            package to be installed.  <filename>configure</filename> will check
+            for the required header files and libraries to make sure that
+            your <productname>OpenSSL</productname> installation is sufficient
+            before proceeding.
+          </para>
+         </listitem>
+         <listitem>
+          <para>
+           <option>nss</option> to build with <productname>libnss</productname> support.
+            This requires the <productname>NSS</productname> package to be installed. Additionally,
+            <productname>NSS</productname> requires <productname>NSPR</productname>
+            to be installed. <filename>configure</filename> will check for the
+            required header files and libraries to make sure that your
+            <productname>NSS</productname> installation is sufficient before
+            proceeding.
+          </para>
+         </listitem>
       </varlistentry>
 
       <varlistentry>
diff --git a/doc/src/sgml/libpq.sgml b/doc/src/sgml/libpq.sgml
index b7a82453f0..ad2ec93848 100644
--- a/doc/src/sgml/libpq.sgml
+++ b/doc/src/sgml/libpq.sgml
@@ -830,6 +830,12 @@ int callback_fn(char *buf, int size, PGconn *conn);
        <function>longjmp(...)</function>, etc. It must return normally.
       </para>
 
+      <para>
+        <function>PQsetSSLKeyPassHook_OpenSSL</function> has no effect unless
+        the server was compiled with <productname>OpenSSL</productname>
+        support.
+      </para>
+
      </listitem>
     </varlistentry>
 
@@ -846,6 +852,70 @@ PQsslKeyPassHook_OpenSSL_type PQgetSSLKeyPassHook_OpenSSL(void);
 </synopsis>
       </para>
 
+      <para>
+        <function>PQgetSSLKeyPassHook_OpenSSL</function> has no effect unless
+        the server was compiled with <productname>OpenSSL</productname>
+        support.
+      </para>
+
+     </listitem>
+    </varlistentry>
+
+    <varlistentry id="libpq-pqsetsslkeypasshook-nss">
+     <term><function>PQsetSSLKeyPassHook_nss</function><indexterm><primary>PQsetSSLKeyPassHook_nss</primary></indexterm></term>
+     <listitem>
+      <para>
+       <function>PQsetSSLKeyPassHook_nss</function> lets an application override
+       <application>libpq</application>'s default handling of password protected
+       objects in the <application>NSS</application> database using
+       <xref linkend="libpq-connect-sslpassword"/> or interactive prompting.
+
+<synopsis>
+void PQsetSSLKeyPassHook_nss(PQsslKeyPassHook_nss_type hook);
+</synopsis>
+
+       The application passes a pointer to a callback function with signature:
+<programlisting>
+char *callback_fn(PK11SlotInfo *slot, PRBool retry, void *arg);
+</programlisting>
+       which <application>libpq</application> will call
+       <emphasis>instead of</emphasis> its default
+       <function>PQdefaultSSLKeyPassHook_nss</function> password handler. The
+       callback should determine the password for the token and return a
+       pointer to it. The returned pointer should be allocated with the NSS
+       <function>PORT_Strdup</function> function. The token for which the
+       password is requested is recorded in the slot anc can be identified by
+       calling <function>PK11_GetTokenName</function>. If no password is
+       known, the callback should return <literal>NULL</literal>. The memory
+       will be owned by <productname>NSS</productname> and should not be
+       freed.
+      </para>
+
+      <para>
+        <function>PQsetSSLKeyPassHook_nss</function> has no effect unless
+        the server was compiled with <productname>NSS</productname> support.
+      </para>
+     </listitem>
+    </varlistentry>
+
+    <varlistentry id="libpq-pqgetsslkeypasshook-nss">
+     <term><function>PQgetSSLKeyPassHook_nss</function><indexterm><primary>PQgetSSLKeyPassHook_nss</primary></indexterm></term>
+     <listitem>
+      <para>
+       <function>PQgetSSLKeyPassHook_nss</function> returns the current
+       <productname>NSS</productname> password hook, or <literal>NULL</literal>
+       if none has been set.
+
+<synopsis>
+PQsslKeyPassHook_nss_type PQgetSSLKeyPassHook_nss(void);
+</synopsis>
+      </para>
+
+      <para>
+        <function>PQgetSSLKeyPassHook_nss</function> has no effect unless the
+        server was compiled with <productname>nss</productname> support.
+      </para>
+
      </listitem>
     </varlistentry>
 
@@ -2497,6 +2567,8 @@ void *PQsslStruct(const PGconn *conn, const char *struct_name);
       </para>
       <para>
        The struct(s) available depend on the SSL implementation in use.
+      </para>
+      <para>
        For <productname>OpenSSL</productname>, there is one struct,
        available under the name "OpenSSL", and it returns a pointer to the
        <productname>OpenSSL</productname> <literal>SSL</literal> struct.
@@ -2520,9 +2592,14 @@ void *PQsslStruct(const PGconn *conn, const char *struct_name);
 ]]></programlisting>
       </para>
       <para>
-       This structure can be used to verify encryption levels, check server
-       certificates, and more. Refer to the <productname>OpenSSL</productname>
-       documentation for information about this structure.
+       For <productname>NSS</productname>, there is one struct available under
+       the name "NSS", and it returns a pointer to the
+       <productname>NSS</productname> <literal>PRFileDesc</literal>.
+      </para>
+      <para>
+       These structures can be used to verify encryption levels, check server
+       certificates, and more. Refer to the <acronym>SSL</acronym> library
+       documentation for information about these structures.
       </para>
      </listitem>
     </varlistentry>
@@ -2549,6 +2626,10 @@ void *PQgetssl(const PGconn *conn);
        <xref linkend="libpq-PQsslInUse"/> instead, and for more details about the
        connection, use <xref linkend="libpq-PQsslAttribute"/>.
       </para>
+      <para>
+       This function returns <literal>NULL</literal> when <acronym>SSL</acronym>
+       librariaes other than <productname>OpenSSL</productname> are used.
+      </para>
      </listitem>
     </varlistentry>
 
@@ -7982,6 +8063,11 @@ void PQinitOpenSSL(int do_ssl, int do_crypto);
        before first opening a database connection.  Also be sure that you
        have done that initialization before opening a database connection.
       </para>
+
+      <para>
+       This function does nothing when using <productname>NSS</productname> as
+       the <acronym>SSL</acronym> library.
+      </para>
      </listitem>
     </varlistentry>
 
@@ -8008,6 +8094,11 @@ void PQinitSSL(int do_ssl);
        might be preferable for applications that need to work with older
        versions of <application>libpq</application>.
       </para>
+
+      <para>
+       This function does nothing when using <productname>NSS</productname> as
+       the <acronym>SSL</acronym> library.
+      </para>
      </listitem>
     </varlistentry>
    </variablelist>
diff --git a/doc/src/sgml/runtime.sgml b/doc/src/sgml/runtime.sgml
index bf877c0e0c..2578ee8c06 100644
--- a/doc/src/sgml/runtime.sgml
+++ b/doc/src/sgml/runtime.sgml
@@ -2185,15 +2185,21 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
 
   <indexterm zone="ssl-tcp">
    <primary>SSL</primary>
+   <secondary>TLS</secondary>
   </indexterm>
 
   <para>
    <productname>PostgreSQL</productname> has native support for using
    <acronym>SSL</acronym> connections to encrypt client/server communications
    for increased security. This requires that
-   <productname>OpenSSL</productname> is installed on both client and
+   a supported TLS library is installed on both client and
    server systems and that support in <productname>PostgreSQL</productname> is
    enabled at build time (see <xref linkend="installation"/>).
+   Supported libraries are <productname>OpenSSL</productname> and
+   <productname>NSS</productname>. The terms <acronym>SSL</acronym> and
+   <acronym>TLS</acronym> are often used interchangeably to mean a secure
+   connection using a <acronym>TLS</acronym> protocol, even though
+   <acronym>SSL</acronym> protocols are no longer supported.
   </para>
 
   <sect2 id="ssl-setup">
@@ -2213,8 +2219,13 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
   </para>
 
   <para>
-   To start in <acronym>SSL</acronym> mode, files containing the server certificate
-   and private key must exist.  By default, these files are expected to be
+   To start in <acronym>SSL</acronym> mode, a server certificate
+   and private key must exist. The below sections on the different libraries
+   will discuss how to configure these.
+  </para>
+   
+  <para>
+   By default, these files are expected to be
    named <filename>server.crt</filename> and <filename>server.key</filename>, respectively, in
    the server's data directory, but other names and locations can be specified
    using the configuration parameters <xref linkend="guc-ssl-cert-file"/>
@@ -2304,6 +2315,18 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
   </note>
   </sect2>
 
+  <sect2 id="ssl-nss-config">
+   <title>NSS Configuration</title>
+
+  <para>
+   <productname>PostgreSQL</productname> will look for certificates and keys
+   in the <productname>NSS</productname> database specified by the parameter
+   <xref linkend="guc-ssl-database"/> in <filename>postgresql.conf</filename>.
+   The parameters for certificate and key filenames are used to identify the
+   nicknames in the database.
+  </para>
+  </sect2>
+
   <sect2 id="ssl-client-certificates">
    <title>Using Client Certificates</title>
 
@@ -2378,7 +2401,7 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
   </sect2>
 
   <sect2 id="ssl-server-files">
-   <title>SSL Server File Usage</title>
+   <title>SSL Server File Parameter Usage</title>
 
    <para>
     <xref linkend="ssl-file-usage"/> summarizes the files that are
@@ -2425,6 +2448,14 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
       <entry>client certificate must not be on this list</entry>
      </row>
 
+     <row>
+      <entry><xref linkend="guc-ssl-database"/></entry>
+      <entry>certificate database</entry>
+      <entry>contains server certificates, keys and revocation lists; only
+      used when <productname>PostgreSQL</productname> is built with support
+      for <productname>NSS</productname>.</entry>
+     </row>
+
     </tbody>
    </tgroup>
   </table>
@@ -2448,7 +2479,7 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
   </sect2>
 
   <sect2 id="ssl-certificate-creation">
-   <title>Creating Certificates</title>
+   <title>Creating Certificates with OpenSSL</title>
 
    <para>
      To create a simple self-signed certificate for the server, valid for 365
@@ -2552,6 +2583,88 @@ openssl x509 -req -in server.csr -text -days 365 \
    </para>
   </sect2>
 
+  <sect2 id="nss-certificate-database">
+   <title>NSS Certificate Databases</title>
+
+   <para>
+    When using <productname>NSS</productname>, all certificates and keys must
+    be loaded into an <productname>NSS</productname> certificate database.
+   </para>
+
+   <para>
+    To create a new <productname>NSS</productname> certificate database and
+    load the certificates created in <xref linkend="ssl-certificate-creation" />,
+    use the following <productname>NSS</productname> commands:
+<programlisting>
+certutil -d "sql:server.db" -N --empty-password
+certutil -d "sql:server.db" -A -n server.crt -i server.crt -t "CT,C,C"
+certutil -d "sql:server.db" -A -n root.crt -i root.crt -t "CT,C,C"
+</programlisting>
+    This will give the certificate the filename as the nickname identifier in
+    the database which is created as <filename>server.db</filename>.
+   </para>
+   <para>
+    Then load the server key, which require converting it to
+    <acronym>PKCS#12</acronym> format using the
+    <productname>OpenSSL</productname> tools:
+<programlisting>
+openssl pkcs12 -export -out server.pfx -inkey server.key -in server.crt \
+  -certfile root.crt -passout pass:
+pk12util -i server.pfx -d server.db -W ''
+</programlisting>
+   </para>
+   <para>
+    Finally a certificate revocation list can be loaded with the following
+    commands:
+<programlisting>
+crlutil -I -i server.crl -d server.db -B
+</programlisting>
+   </para>
+  </sect2>
+
+  <sect2 id="nss-ssl-certificate-creation" />
+   <title>Creating Certificates with NSS</title>
+
+   <para>
+    To create a simple self-signed CA and certificate for the server, use the
+    following NSS commands. Replace
+    <replaceable>*.yourdomain.com</replaceable> with the server's host
+    name. Remove <replaceable>--empty-password</replaceable> in order to set
+    a password protecting the databases. The password can be passed to
+    <application>certutil</certutil> with the <literal>-f</literal> parameter.
+    First create a self-signed CA. To use a different certificate validity
+    time than the default, use <replaceable>-v</replaceable> to specify the
+    number of months of validity.
+<programlisting>
+mkdir root_ca.db
+certutil -N -d "sql:root_ca.db/" --empty-password
+certutil -S -d "sql:root_ca.db/" -n root_ca -s "CN=<replaceable>ca.yourdomain.com</replaceable>" \
+  -x -k rsa -g 2048 -m <replaceable>5432</replaceable> -t CTu,CTu,CTu \
+  --keyUsage certSigning -2 --nsCertType sslCA,smimeCA,objectSigningCA \
+  -Z SHA256
+certutil -L -d "sql:root_ca.db/" -n root_ca -a > root_ca.pem
+</programlisting>
+    Now create a server certificate database, and create a certificate signing
+    request for the CA. Then sign the request with the already created CA and
+    insert the certificate chain into the certificate database.
+<programlisting>
+mkdir server_cert.db
+certutil -N -d "sql:server_cert.db/" --empty-password
+certutil -R -d "sql:server_cert.db/" -s "CN=dbhost.yourdomain.com" \
+  -o server_cert.csr -g 2048 -Z SHA256
+
+certutil -C -d "sql:root_ca.db/" -c root_ca -i server_cert.csr \
+  -o server_cert.der -m <replaceable>5433</replaceable> \
+  --keyUsage keyEncipherment,dataEncipherment,digitalSignature \
+  --nsCertType sslServer -Z SHA256
+
+certutil -A -d "sql:server_cert.db/" -n root_ca -t CTu,CTu,CTu -a -i root_ca.pem
+certutil -A -d "sql:server_cert.db/" -n server_cert -t CTu,CTu,CTu -i server_cert.der
+</programlisting>
+    The server certificate is loaded into the certificate database as well as
+    the CA certificate in order to provide the chain of certificates.
+  </sect2>
+
  </sect1>
 
  <sect1 id="gssapi-enc">
-- 
2.21.1 (Apple Git-122.3)

From 102b76c3d46ec19748ce4ce06ed9435972c30ccc Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Mon, 8 Feb 2021 23:52:39 +0100
Subject: [PATCH v26 05/10] nss: pg_strong_random support

This adds support for using the RNG in libnss as a backend for
pg_strong_random.
---
 src/port/pg_strong_random.c | 50 ++++++++++++++++++++++++++++++++++++-
 1 file changed, 49 insertions(+), 1 deletion(-)

diff --git a/src/port/pg_strong_random.c b/src/port/pg_strong_random.c
index 07f24c0089..40de237628 100644
--- a/src/port/pg_strong_random.c
+++ b/src/port/pg_strong_random.c
@@ -137,7 +137,55 @@ pg_strong_random(void *buf, size_t len)
 	return false;
 }
 
-#else							/* not USE_OPENSSL or WIN32 */
+#elif defined(USE_NSS)
+
+#define pg_BITS_PER_BYTE BITS_PER_BYTE
+#undef BITS_PER_BYTE
+#define NO_NSPR_10_SUPPORT
+#include <nss/nss.h>
+#include <nss/pk11pub.h>
+#if defined(BITS_PER_BYTE)
+#if BITS_PER_BYTE != pg_BITS_PER_BYTE
+#error "incompatible byte widths between NSPR and postgres"
+#endif
+#else
+#define BITS_PER_BYTE pg_BITS_PER_BYTE
+#endif
+#undef pg_BITS_PER_BYTE
+
+void
+pg_strong_random_init(void)
+{
+	/* No initialization needed on NSS */
+}
+
+bool
+pg_strong_random(void *buf, size_t len)
+{
+	NSSInitParameters params;
+	NSSInitContext *nss_context;
+	SECStatus	status;
+
+	memset(&params, 0, sizeof(params));
+	params.length = sizeof(params);
+	nss_context = NSS_InitContext("", "", "", "", &params,
+								  NSS_INIT_READONLY | NSS_INIT_NOCERTDB |
+								  NSS_INIT_NOMODDB | NSS_INIT_FORCEOPEN |
+								  NSS_INIT_NOROOTINIT | NSS_INIT_PK11RELOAD);
+
+	if (!nss_context)
+		return false;
+
+	status = PK11_GenerateRandom(buf, len);
+	NSS_ShutdownContext(nss_context);
+
+	if (status == SECSuccess)
+		return true;
+
+	return false;
+}
+
+#else							/* not USE_OPENSSL, USE_NSS or WIN32 */
 
 /*
  * Without OpenSSL or Win32 support, just read /dev/urandom ourselves.
-- 
2.21.1 (Apple Git-122.3)

From a595749b283822921dd08e8eceeed33bcb6d9dcc Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Mon, 8 Feb 2021 23:52:37 +0100
Subject: [PATCH v26 04/10] nss: Add NSS specific tests

This adds the SSL/Backend/NSS which implements the setup and teardown
required as well as adds the NSS configuration to the existing tests.

The OpenSSL testfiles are reused by repackaging them into NSS databases
in order for the tests to be cross-library. Additional testfiles are
generated by using only the NSS toolchain as well as rudimentary tests
using these.
---
 src/test/ssl/Makefile             | 225 +++++++++++++++++++++++
 src/test/ssl/t/001_ssltests.pl    | 296 ++++++++++++++++++++----------
 src/test/ssl/t/002_scram.pl       |  29 ++-
 src/test/ssl/t/SSL/Backend/NSS.pm |  73 ++++++++
 4 files changed, 523 insertions(+), 100 deletions(-)
 create mode 100644 src/test/ssl/t/SSL/Backend/NSS.pm

diff --git a/src/test/ssl/Makefile b/src/test/ssl/Makefile
index d545382eea..6966dc23d2 100644
--- a/src/test/ssl/Makefile
+++ b/src/test/ssl/Makefile
@@ -30,6 +30,35 @@ SSLFILES := $(CERTIFICATES:%=ssl/%.key) $(CERTIFICATES:%=ssl/%.crt) \
 	ssl/client+client_ca.crt ssl/client-der.key \
 	ssl/client-encrypted-pem.key ssl/client-encrypted-der.key
 
+# Even though we in practice could get away with far fewer NSS databases, they
+# are generated to mimic the setup for the OpenSSL tests in order to ensure
+# we isolate the same behavior between the backends. The database name should
+# contain the files included for easier test suite code reading.
+NSSFILES := ssl/nss/client_ca.crt.db \
+	ssl/nss/server_ca.crt.db \
+	ssl/nss/root+server_ca.crt.db \
+	ssl/nss/root+client_ca.crt.db \
+	ssl/nss/client.crt__client.key.db \
+	ssl/nss/client-revoked.crt__client-revoked.key.db \
+	ssl/nss/server-cn-only.crt__server-password.key.db \
+	ssl/nss/server-cn-only.crt__server-cn-only.key.db \
+	ssl/nss/root.crl \
+	ssl/nss/server.crl \
+	ssl/nss/client.crl \
+	ssl/nss/server-multiple-alt-names.crt__server-multiple-alt-names.key.db \
+	ssl/nss/server-single-alt-name.crt__server-single-alt-name.key.db \
+	ssl/nss/server-cn-and-alt-names.crt__server-cn-and-alt-names.key.db \
+	ssl/nss/server-no-names.crt__server-no-names.key.db \
+	ssl/nss/server-revoked.crt__server-revoked.key.db \
+	ssl/nss/root+client.crl \
+	ssl/nss/client+client_ca.crt__client.key.db \
+	ssl/nss/client.crt__client-encrypted-pem.key.db \
+	ssl/nss/root+server_ca.crt__server.crl.db \
+	ssl/nss/root+server_ca.crt__root+server.crl.db \
+	ssl/nss/native_ca-root.db \
+	ssl/nss/native_server-root.db \
+	ssl/nss/native_client-root.db
+
 # This target re-generates all the key and certificate files. Usually we just
 # use the ones that are committed to the tree without rebuilding them.
 #
@@ -37,6 +66,10 @@ SSLFILES := $(CERTIFICATES:%=ssl/%.key) $(CERTIFICATES:%=ssl/%.crt) \
 #
 sslfiles: $(SSLFILES)
 
+# Generate NSS certificate databases corresponding to the OpenSSL certificates.
+# This target will fail unless preceded by nssfiles-clean.
+nssfiles: $(NSSFILES)
+
 # OpenSSL requires a directory to put all generated certificates in. We don't
 # use this for anything, but we need a location.
 ssl/new_certs_dir:
@@ -64,6 +97,24 @@ ssl/%_ca.crt: ssl/%_ca.key %_ca.config ssl/root_ca.crt ssl/new_certs_dir
 	rm ssl/temp_ca.crt ssl/temp_ca_signed.crt
 	echo "01" > ssl/$*_ca.srl
 
+ssl/nss/%_ca.crt.db: ssl/%_ca.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n $*_ca.crt -i ssl/$*_ca.crt -t "CT,C,C"
+
+ssl/nss/root+server_ca.crt__server.crl.db: ssl/root+server_ca.crt ssl/nss/server.crl
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	crlutil -I -i ssl/nss/server.crl -d $@ -B
+
+ssl/nss/root+server_ca.crt__root+server.crl.db: ssl/root+server_ca.crt ssl/nss/root.crl ssl/nss/server.crl
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	crlutil -I -i ssl/nss/root.crl -d $@ -B
+	crlutil -I -i ssl/nss/server.crl -d $@ -B
+
 # Server certificates, signed by server CA:
 ssl/server-%.crt: ssl/server-%.key ssl/server_ca.crt server-%.config
 	openssl req -new -key ssl/server-$*.key -out ssl/server-$*.csr -config server-$*.config
@@ -77,6 +128,79 @@ ssl/server-ss.crt: ssl/server-cn-only.key ssl/server-cn-only.crt server-cn-only.
 	openssl x509 -req -days 10000 -in ssl/server-ss.csr -signkey ssl/server-cn-only.key -out ssl/server-ss.crt  -extensions v3_req -extfile server-cn-only.config
 	rm ssl/server-ss.csr
 
+# pk12util won't preserve the password when importing the password protected
+# key, the password must be set on the database *before* importing it as the
+# password in the pkcs12 envelope will be dropped.
+ssl/nss/server-cn-only.crt__server-password.key.db: ssl/server-cn-only.crt
+	$(MKDIR_P) $@
+	echo "secret1" > password.txt
+	certutil -d "sql:$@" -N -f password.txt
+	certutil -d "sql:$@" -A -n ssl/server-cn-only.crt -i ssl/server-cn-only.crt -t "CT,C,C" -f password.txt
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C" -f password.txt
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C" -f password.txt
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C" -f password.txt
+	openssl pkcs12 -export -out ssl/nss/server-password.pfx -inkey ssl/server-password.key -in ssl/server-cn-only.crt -certfile ssl/server_ca.crt -passin 'pass:secret1' -passout 'pass:secret1'
+	pk12util -i ssl/nss/server-password.pfx -d "sql:$@" -W 'secret1' -K 'secret1'
+
+ssl/nss/server-cn-only.crt__server-cn-only.key.db: ssl/server-cn-only.crt ssl/server-cn-only.key
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-cn-only.crt -i ssl/server-cn-only.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-cn-only.pfx -inkey ssl/server-cn-only.key -in ssl/server-cn-only.crt -certfile ssl/server_ca.crt -passout pass:
+	pk12util -i ssl/nss/server-cn-only.pfx -d "sql:$@" -W ''
+
+ssl/nss/server-multiple-alt-names.crt__server-multiple-alt-names.key.db: ssl/server-multiple-alt-names.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-multiple-alt-names.crt -i ssl/server-multiple-alt-names.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-multiple-alt-names.pfx -inkey ssl/server-multiple-alt-names.key -in ssl/server-multiple-alt-names.crt -certfile ssl/server-multiple-alt-names.crt -passout pass:
+	pk12util -i ssl/nss/server-multiple-alt-names.pfx -d "sql:$@" -W ''
+
+ssl/nss/server-single-alt-name.crt__server-single-alt-name.key.db: ssl/server-single-alt-name.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-single-alt-name.crt -i ssl/server-single-alt-name.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-single-alt-name.pfx -inkey ssl/server-single-alt-name.key -in ssl/server-single-alt-name.crt -certfile ssl/server-single-alt-name.crt -passout pass:
+	pk12util -i ssl/nss/server-single-alt-name.pfx -d "sql:$@" -W ''
+
+ssl/nss/server-cn-and-alt-names.crt__server-cn-and-alt-names.key.db: ssl/server-cn-and-alt-names.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-cn-and-alt-names.crt -i ssl/server-cn-and-alt-names.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-cn-and-alt-names.pfx -inkey ssl/server-cn-and-alt-names.key -in ssl/server-cn-and-alt-names.crt -certfile ssl/server-cn-and-alt-names.crt -passout pass:
+	pk12util -i ssl/nss/server-cn-and-alt-names.pfx -d $@ -W ''
+
+ssl/nss/server-no-names.crt__server-no-names.key.db: ssl/server-no-names.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-no-names.crt -i ssl/server-no-names.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-no-names.pfx -inkey ssl/server-no-names.key -in ssl/server-no-names.crt -certfile ssl/server-no-names.crt -passout pass:
+	pk12util -i ssl/nss/server-no-names.pfx -d "sql:$@" -W ''
+
+ssl/nss/server-revoked.crt__server-revoked.key.db: ssl/server-revoked.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-revoked.crt -i ssl/server-revoked.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-revoked.pfx -inkey ssl/server-revoked.key -in ssl/server-revoked.crt -certfile ssl/server-revoked.crt -passout pass:
+	pk12util -i ssl/nss/server-revoked.pfx -d "sql:$@" -W ''
+
 # Password-protected version of server-cn-only.key
 ssl/server-password.key: ssl/server-cn-only.key
 	openssl rsa -aes256 -in $< -out $@ -passout 'pass:secret1'
@@ -88,6 +212,27 @@ ssl/client.crt: ssl/client.key ssl/client_ca.crt
 	openssl x509 -in ssl/temp.crt -out ssl/client.crt # to keep just the PEM cert
 	rm ssl/client.csr ssl/temp.crt
 
+# Client certificate, signed by client CA
+ssl/nss/client.crt__client.key.db: ssl/client.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/client.crt -i ssl/client.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root+client_ca.crt -i ssl/root+client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client.pfx -inkey ssl/client.key -in ssl/client.crt -certfile ssl/client_ca.crt -passout pass:
+	pk12util -i ssl/nss/client.pfx -d "sql:$@" -W ''
+
+# Client certificate with encrypted key, signed by client CA
+ssl/nss/client.crt__client-encrypted-pem.key.db: ssl/client.crt
+	$(MKDIR_P) $@
+	echo 'dUmmyP^#+' > $@.pass
+	certutil -d "sql:$@" -N -f $@.pass
+	certutil -d "sql:$@" -A -f $@.pass -n ssl/client.crt -i ssl/client.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -f $@.pass -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -f $@.pass -n root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client-encrypted-pem.pfx -inkey ssl/client-encrypted-pem.key -in ssl/client.crt -certfile ssl/client_ca.crt -passin pass:'dUmmyP^#+' -passout pass:'dUmmyP^#+'
+	pk12util -i ssl/nss/client-encrypted-pem.pfx -d "sql:$@" -W 'dUmmyP^#+' -k $@.pass
+
 # Another client certificate, signed by the client CA. This one is revoked.
 ssl/client-revoked.crt: ssl/client-revoked.key ssl/client_ca.crt client.config
 	openssl req -new -key ssl/client-revoked.key -out ssl/client-revoked.csr -config client.config
@@ -95,6 +240,14 @@ ssl/client-revoked.crt: ssl/client-revoked.key ssl/client_ca.crt client.config
 	openssl x509 -in ssl/temp.crt -out ssl/client-revoked.crt # to keep just the PEM cert
 	rm ssl/client-revoked.csr ssl/temp.crt
 
+ssl/nss/client-revoked.crt__client-revoked.key.db: ssl/client-revoked.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/client-revoked.crt -i ssl/client-revoked.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client-revoked.pfx -inkey ssl/client-revoked.key -in ssl/client-revoked.crt -certfile ssl/client_ca.crt -passout pass:
+	pk12util -i ssl/nss/client-revoked.pfx -d "sql:$@" -W ''
+
 # Convert the key to DER, to test our behaviour there too
 ssl/client-der.key: ssl/client.key
 	openssl rsa -in ssl/client.key -outform DER -out ssl/client-der.key
@@ -127,19 +280,40 @@ ssl/root+client_ca.crt: ssl/root_ca.crt ssl/client_ca.crt
 ssl/client+client_ca.crt: ssl/client.crt ssl/client_ca.crt
 	cat $^ > $@
 
+# Client certificate, signed by client CA
+ssl/nss/client+client_ca.crt__client.key.db: ssl/client+client_ca.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/client+client_ca.crt -i ssl/client+client_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n ssl/root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client.pfx -inkey ssl/client.key -in ssl/client.crt -certfile ssl/client_ca.crt -passout pass:
+	pk12util -i ssl/nss/client.pfx -d "sql:$@" -W ''
+
 #### CRLs
 
 ssl/client.crl: ssl/client-revoked.crt
 	openssl ca -config cas.config -name client_ca -revoke ssl/client-revoked.crt
 	openssl ca -config cas.config -name client_ca -gencrl -out ssl/client.crl
 
+ssl/nss/client.crl: ssl/client.crl
+	openssl crl -in $^ -outform der -out $@
+
 ssl/server.crl: ssl/server-revoked.crt
 	openssl ca -config cas.config -name server_ca -revoke ssl/server-revoked.crt
 	openssl ca -config cas.config -name server_ca -gencrl -out ssl/server.crl
 
+ssl/nss/server.crl: ssl/server.crl
+	openssl crl -in $^ -outform der -out $@
+
 ssl/root.crl: ssl/root_ca.crt
 	openssl ca -config cas.config -name root_ca -gencrl -out ssl/root.crl
 
+ssl/nss/root.crl: ssl/root.crl
+	openssl crl -in $^ -outform der -out $@
+
+ssl/nss/root+client.crl: ssl/root+client.crl
+	openssl crl -in $^ -outform der -out $@
+
 # If a CRL is used, OpenSSL requires a CRL file for *all* the CAs in the
 # chain, even if some of them are empty.
 ssl/root+server.crl: ssl/root.crl ssl/server.crl
@@ -147,13 +321,64 @@ ssl/root+server.crl: ssl/root.crl ssl/server.crl
 ssl/root+client.crl: ssl/root.crl ssl/client.crl
 	cat $^ > $@
 
+#### NSS specific certificates and keys
+
+ssl/nss/native_ca-%.db:
+	$(MKDIR_P) ssl/nss/native_ca-$*.db
+	certutil -N -d "sql:ssl/nss/native_ca-$*.db/" --empty-password
+	echo y > nss_ca_params.txt
+	echo 10 >> nss_ca_params.txt
+	echo y >> nss_ca_params.txt
+	cat nss_ca_params.txt | certutil -S -d "sql:ssl/nss/native_ca-$*.db/" -n ca-$* \
+	-s "CN=Test CA for PostgreSQL SSL regression tests,OU=PostgreSQL test suite" \
+	-x -k rsa -g 2048 -m 5432 -t CTu,CTu,CTu \
+	--keyUsage certSigning -2 --nsCertType sslCA,smimeCA,objectSigningCA \
+	-z Makefile -Z SHA256
+	rm nss_ca_params.txt
+
+ssl/nss/native_ca-%.pem: ssl/nss/native_ca-%.db
+	certutil -L -d "sql:ssl/nss/native_ca-$*.db/" -n ca-$* -a > ssl/nss/native_ca-$*.pem
+
+# Create and sign a server certificate
+ssl/nss/native_server-%.db: ssl/nss/native_ca-%.pem
+	$(MKDIR_P) ssl/nss/native_server-$*.db
+	certutil -N -d "sql:ssl/nss/native_server-$*.db/" --empty-password
+	certutil -R -d "sql:ssl/nss/native_server-$*.db/" \
+		-s "CN=common-name.pg-ssltest.test,OU=PostgreSQL test suite" \
+		-o ssl/nss/native_server-$*.csr -g 2048 -Z SHA256 -z Makefile
+	echo 1 > nss_server_params.txt
+	echo 9 >> nss_server_params.txt
+	cat nss_server_params.txt | certutil -C -d "sql:ssl/nss/native_ca-$*.db/" -c ca-root -i ssl/nss/native_server-$*.csr \
+		-o ssl/nss/native_server_$*.der -m 5433 --keyUsage dataEncipherment,digitalSignature,keyEncipherment \
+		--nsCertType sslServer --certVersion 1 -Z SHA256
+	certutil -A -d "sql:ssl/nss/native_server-$*.db/" -n ca-$* -t CTu,CTu,CTu -a -i ssl/nss/native_ca-$*.pem
+	certutil -A -d "sql:ssl/nss/native_server-$*.db/" -n ssl/native_server-$*.crt -t CTu,CTu,CTu -i ssl/nss/native_server_$*.der
+	rm nss_server_params.txt
+
+# Create and sign a client certificate
+ssl/nss/native_client-%.db: ssl/nss/native_ca-%.pem
+	$(MKDIR_P) ssl/nss/native_client-$*.db
+	certutil -N -d "sql:ssl/nss/native_client-$*.db/" --empty-password
+	certutil -R -d "sql:ssl/nss/native_client-$*.db/" -s "CN=ssltestuser,OU=PostgreSQL test suite" \
+		-o ssl/nss/native_client-$*.csr -g 2048 -Z SHA256 -z Makefile
+	certutil -C -d "sql:ssl/nss/native_ca-$*.db/" -c ca-$* -i ssl/nss/native_client-$*.csr -o ssl/nss/native_client-$*.der \
+		-m 5434 --keyUsage keyEncipherment,dataEncipherment,digitalSignature --nsCertType sslClient \
+		--certVersion 1 -Z SHA256
+	certutil -A -d "sql:ssl/nss/native_client-$*.db" -n ca-$* -t CTu,CTu,CTu -a -i ssl/nss/native_ca-$*.pem
+	certutil -A -d "sql:ssl/nss/native_client-$*.db" -n native_client-$* -t CTu,CTu,CTu -i ssl/nss/native_client-$*.der
+
 .PHONY: sslfiles-clean
 sslfiles-clean:
 	rm -f $(SSLFILES) ssl/client_ca.srl ssl/server_ca.srl ssl/client_ca-certindex* ssl/server_ca-certindex* ssl/root_ca-certindex* ssl/root_ca.srl ssl/temp_ca.crt ssl/temp_ca_signed.crt
 
+.PHONY: nssfiles-clean
+nssfiles-clean:
+	rm -rf ssl/nss
+
 clean distclean maintainer-clean:
 	rm -rf tmp_check
 	rm -rf ssl/*.old ssl/new_certs_dir ssl/client*_tmp.key
+	rm -rf ssl/nss
 
 # Doesn't depend on $(SSLFILES) because we don't rebuild them by default
 check:
diff --git a/src/test/ssl/t/001_ssltests.pl b/src/test/ssl/t/001_ssltests.pl
index a6d79e2bfc..394505dd8b 100644
--- a/src/test/ssl/t/001_ssltests.pl
+++ b/src/test/ssl/t/001_ssltests.pl
@@ -9,7 +9,20 @@ use lib $FindBin::RealBin;
 
 use SSL::Server;
 
-if ($ENV{with_ssl} ne 'openssl')
+my $openssl;
+my $nss;
+
+if ($ENV{with_ssl} eq 'openssl')
+{
+	$openssl = 1;
+	plan tests => 93;
+}
+elsif ($ENV{with_ssl} eq 'nss')
+{
+	$nss = 1;
+	plan tests => 99;
+}
+else
 {
 	plan skip_all => 'SSL not supported by this build';
 }
@@ -47,19 +60,58 @@ configure_test_server_for_ssl($node, $SERVERHOSTADDR, $SERVERHOSTCIDR,
 
 note "testing password-protected keys";
 
-set_server_cert($node, 'server-cn-only', 'root+client_ca',
-				   'server-password', 'echo wrongpassword');
-command_fails(
-	[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
-	'restart fails with password-protected key file with wrong password');
-$node->_update_pid(0);
+# Since the passphrase callbacks operate at different stages in OpenSSL and
+# NSS we have two separate blocks for them
+SKIP:
+{
+	skip "Certificate passphrases aren't checked on server restart in NSS", 2
+	  if ($nss);
+
+	set_server_cert($node, 'server-cn-only', 'root+client_ca',
+					   'server-password', 'echo wrongpassword');
+	command_fails(
+		[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
+		'restart fails with password-protected key file with wrong password');
+	$node->_update_pid(0);
+
+	set_server_cert($node, 'server-cn-only', 'root+client_ca',
+					'server-password', 'echo secret1');
+	command_ok(
+		[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
+		'restart succeeds with password-protected key file');
+	$node->_update_pid(1);
+}
 
-set_server_cert($node, 'server-cn-only', 'root+client_ca',
-				'server-password', 'echo secret1');
-command_ok(
-	[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
-	'restart succeeds with password-protected key file');
-$node->_update_pid(1);
+SKIP:
+{
+	skip "Certificate passphrases are checked on connection in NSS", 5
+	  if ($openssl);
+
+	set_server_cert($node, 'server-cn-only', 'root+client_ca',
+					   'server-password', 'echo wrongpassword');
+	command_ok(
+		[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
+		'restart fails with password-protected key file with wrong password');
+	$node->_update_pid(1);
+
+	test_connect_fails(
+		"user=ssltestuser dbname=trustdb sslcert=invalid hostaddr=$SERVERHOSTADDR host=common-name.pg-ssltest.test",
+		"sslrootcert=invalid sslmode=require",
+		qr/\QSSL error\E/,
+		"connect to server with incorrect key password configured");
+
+	set_server_cert($node, 'server-cn-only', 'root+client_ca',
+					   'server-password', 'echo secret1');
+	command_ok(
+		[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
+		'restart fails with password-protected key file with wrong password');
+	$node->_update_pid(1);
+
+	test_connect_ok(
+		"user=ssltestuser dbname=trustdb sslcert=invalid hostaddr=$SERVERHOSTADDR host=common-name.pg-ssltest.test",
+		"sslrootcert=invalid sslmode=require",
+		"connect to server with correct key password configured");
+}
 
 # Test compatibility of SSL protocols.
 # TLSv1.1 is lower than TLSv1.2, so it won't work.
@@ -107,82 +159,105 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"sslrootcert=invalid sslmode=verify-ca",
-	qr/root certificate file "invalid" does not exist/,
+	qr/root certificate file "invalid" does not exist|Peer's certificate issuer has been marked as not trusted by the user/,
 	"connect without server root cert sslmode=verify-ca");
 test_connect_fails(
 	$common_connstr,
 	"sslrootcert=invalid sslmode=verify-full",
-	qr/root certificate file "invalid" does not exist/,
+	qr/root certificate file "invalid" does not exist|Peer's certificate issuer has been marked as not trusted by the user/,
 	"connect without server root cert sslmode=verify-full");
 
 # Try with wrong root cert, should fail. (We're using the client CA as the
 # root, but the server's key is signed by the server CA.)
-test_connect_fails($common_connstr,
-	"sslrootcert=ssl/client_ca.crt sslmode=require",
-	qr/SSL error/, "connect with wrong server root cert sslmode=require");
-test_connect_fails($common_connstr,
-	"sslrootcert=ssl/client_ca.crt sslmode=verify-ca",
-	qr/SSL error/, "connect with wrong server root cert sslmode=verify-ca");
-test_connect_fails($common_connstr,
-	"sslrootcert=ssl/client_ca.crt sslmode=verify-full",
-	qr/SSL error/, "connect with wrong server root cert sslmode=verify-full");
-
-# Try with just the server CA's cert. This fails because the root file
-# must contain the whole chain up to the root CA.
-test_connect_fails($common_connstr,
-	"sslrootcert=ssl/server_ca.crt sslmode=verify-ca",
-	qr/SSL error/, "connect with server CA cert, without root CA");
+test_connect_fails(
+	$common_connstr,
+	"sslrootcert=ssl/client_ca.crt sslmode=require cert_database=ssl/nss/client_ca.crt.db",
+	qr/SSL error/,
+	"connect with wrong server root cert sslmode=require");
+test_connect_fails(
+	$common_connstr,
+	"sslrootcert=ssl/client_ca.crt sslmode=verify-ca cert_database=ssl/nss/client_ca.crt.db",
+	qr/SSL error/,
+	"connect with wrong server root cert sslmode=verify-ca");
+test_connect_fails(
+	$common_connstr,
+	"sslrootcert=ssl/client_ca.crt sslmode=verify-full cert_database=ssl/nss/client_ca.crt.db",
+	qr/SSL error/,
+	"connect with wrong server root cert sslmode=verify-full");
+
+SKIP:
+{
+	# NSS supports partial chain validation, so this test doesn't work there.
+	# This is similar to the OpenSSL option X509_V_FLAG_PARTIAL_CHAIN which
+	# we don't allow.
+	skip "NSS support partial chain validation", 2 if ($nss);
+	# Try with just the server CA's cert. This fails because the root file
+	# must contain the whole chain up to the root CA.
+	test_connect_fails($common_connstr,
+		"sslrootcert=ssl/server_ca.crt sslmode=verify-ca",
+		qr/SSL error/, "connect with server CA cert, without root CA");
+}
 
 # And finally, with the correct root cert.
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require cert_database=ssl/nss/root+server_ca.crt.db",
 	"connect with correct server CA cert file sslmode=require");
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca cert_database=ssl/nss/root+server_ca.crt.db",
 	"connect with correct server CA cert file sslmode=verify-ca");
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-full",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db",
 	"connect with correct server CA cert file sslmode=verify-full");
 
-# Test with cert root file that contains two certificates. The client should
-# be able to pick the right one, regardless of the order in the file.
-test_connect_ok(
-	$common_connstr,
-	"sslrootcert=ssl/both-cas-1.crt sslmode=verify-ca",
-	"cert root file that contains two certificates, order 1");
-test_connect_ok(
-	$common_connstr,
-	"sslrootcert=ssl/both-cas-2.crt sslmode=verify-ca",
-	"cert root file that contains two certificates, order 2");
+SKIP:
+{
+	skip "CA ordering is irrelevant in NSS databases", 2 if ($nss);
 
+	# Test with cert root file that contains two certificates. The client should
+	# be able to pick the right one, regardless of the order in the file.
+	test_connect_ok(
+		$common_connstr,
+		"sslrootcert=ssl/both-cas-1.crt sslmode=verify-ca",
+		"cert root file that contains two certificates, order 1");
+
+	# How about import the both-file into a database?
+	test_connect_ok(
+		$common_connstr,
+		"sslrootcert=ssl/both-cas-2.crt sslmode=verify-ca",
+		"cert root file that contains two certificates, order 2");
+}
 # CRL tests
 
 # Invalid CRL filename is the same as no CRL, succeeds
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=invalid",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=invalid cert_database=ssl/nss/root+server_ca.crt.db",
 	"sslcrl option with invalid file name");
 
-# A CRL belonging to a different CA is not accepted, fails
-test_connect_fails(
-	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/client.crl",
-	qr/SSL error/,
-	"CRL belonging to a different CA");
+SKIP:
+{
+	skip "CRL's are verified when adding to NSS database", 2 if ($nss);
+	# A CRL belonging to a different CA is not accepted, fails
+	test_connect_fails(
+		$common_connstr,
+		"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/client.crl",
+		qr/SSL error/,
+		"CRL belonging to a different CA");
+}
 
 # With the correct CRL, succeeds (this cert is not revoked)
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/root+server.crl",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/root+server.crl cert_database=ssl/nss/root+server_ca.crt__root+server.crl.db",
 	"CRL with a non-revoked cert");
 
 # Check that connecting with verify-full fails, when the hostname doesn't
 # match the hostname in the server's certificate.
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -195,14 +270,14 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"sslmode=verify-full host=wronghost.test",
-	qr/\Qserver certificate for "common-name.pg-ssltest.test" does not match host name "wronghost.test"\E/,
+	qr/\Qserver certificate for "common-name.pg-ssltest.test" does not match host name "wronghost.test"\E|requested domain name does not match the server's certificate/,
 	"mismatch between host name and server certificate sslmode=verify-full");
 
 # Test Subject Alternative Names.
 switch_server_cert($node, 'server-multiple-alt-names');
 
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -220,12 +295,12 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"host=wronghost.alt-name.pg-ssltest.test",
-	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "wronghost.alt-name.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "wronghost.alt-name.pg-ssltest.test"\E|requested domain name does not match the server's certificate/,
 	"host name not matching with X.509 Subject Alternative Names");
 test_connect_fails(
 	$common_connstr,
 	"host=deep.subdomain.wildcard.pg-ssltest.test",
-	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E|requested domain name does not match the server's certificate/,
 	"host name not matching with X.509 Subject Alternative Names wildcard");
 
 # Test certificate with a single Subject Alternative Name. (this gives a
@@ -233,7 +308,7 @@ test_connect_fails(
 switch_server_cert($node, 'server-single-alt-name');
 
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -243,12 +318,12 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"host=wronghost.alt-name.pg-ssltest.test",
-	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "wronghost.alt-name.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "wronghost.alt-name.pg-ssltest.test"\E|requested domain name does not match the server's certificate/,
 	"host name not matching with a single X.509 Subject Alternative Name");
 test_connect_fails(
 	$common_connstr,
 	"host=deep.subdomain.wildcard.pg-ssltest.test",
-	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E|requested domain name does not match the server's certificate/,
 	"host name not matching with a single X.509 Subject Alternative Name wildcard"
 );
 
@@ -257,7 +332,7 @@ test_connect_fails(
 switch_server_cert($node, 'server-cn-and-alt-names');
 
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -270,14 +345,14 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"host=common-name.pg-ssltest.test",
-	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 1 other name) does not match host name "common-name.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 1 other name) does not match host name "common-name.pg-ssltest.test"\E|requested domain name does not match the server's certificate/,
 	"certificate with both a CN and SANs ignores CN");
 
 # Finally, test a server certificate that has no CN or SANs. Of course, that's
 # not a very sensible certificate, but libpq should handle it gracefully.
 switch_server_cert($node, 'server-no-names');
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -286,7 +361,7 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"sslmode=verify-full host=common-name.pg-ssltest.test",
-	qr/could not get server's host name from server certificate/,
+	qr/could not get server's host name from server certificate|requested domain name does not match the server's certificate./,
 	"server certificate without CN or SANs sslmode=verify-full");
 
 # Test that the CRL works
@@ -298,11 +373,11 @@ $common_connstr =
 # Without the CRL, succeeds. With it, fails.
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca cert_database=ssl/nss/root+server_ca.crt.db",
 	"connects without client-side CRL");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/root+server.crl",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/server.crl cert_database=ssl/nss/root+server_ca.crt__server.crl.db",
 	qr/SSL error/,
 	"does not connect with client-side CRL");
 
@@ -323,32 +398,50 @@ command_like(
 # Test min/max SSL protocol versions.
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.2",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.2 cert_database=ssl/nss/root+server_ca.crt.db",
 	"connection success with correct range of TLS protocol versions");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.1",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.1 cert_database=ssl/nss/root+server_ca.crt.db",
 	qr/invalid SSL protocol version range/,
 	"connection failure with incorrect range of TLS protocol versions");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=incorrect_tls",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=incorrect_tls cert_database=ssl/nss/root+server_ca.crt.db",
 	qr/invalid ssl_min_protocol_version value/,
 	"connection failure with an incorrect SSL protocol minimum bound");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_max_protocol_version=incorrect_tls",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_max_protocol_version=incorrect_tls cert_database=ssl/nss/root+server_ca.crt.db",
 	qr/invalid ssl_max_protocol_version value/,
 	"connection failure with an incorrect SSL protocol maximum bound");
 
+# tests of NSS generated certificates/keys
+SKIP:
+{
+	skip "NSS specific tests",            1 if ($openssl);
+
+	switch_server_cert($node, 'native_server-root', 'native_ca-root');
+	$common_connstr =
+	  "user=ssltestuser dbname=trustdb hostaddr=$SERVERHOSTADDR host=common-name.pg-ssltest.test";
+
+	test_connect_ok(
+		$common_connstr,
+		"sslmode=require user=ssltestuser",
+		"NSS generated certificates"
+	);
+}
+
 ### Server-side tests.
 ###
 ### Test certificate authorization.
 
+switch_server_cert($node, 'server-revoked');
+
 note "running server tests";
 
 $common_connstr =
-  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR";
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client.crt__client.key.db";
 
 # no client cert
 test_connect_fails(
@@ -364,32 +457,43 @@ test_connect_ok(
 	"certificate authorization succeeds with correct client cert in PEM format"
 );
 
-# correct client cert in unencrypted DER
-test_connect_ok(
-	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-der_tmp.key",
-	"certificate authorization succeeds with correct client cert in DER format"
-);
+$common_connstr =
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR";
+
+SKIP:
+{
+	skip "NSS database not implemented in the Makefile", 1 if ($nss);
+	# correct client cert in unencrypted DER
+	test_connect_ok(
+		$common_connstr,
+		"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-der_tmp.key",
+		"certificate authorization succeeds with correct client cert in DER format"
+	);
+}
 
 # correct client cert in encrypted PEM
 test_connect_ok(
 	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='dUmmyP^#+'",
+	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='dUmmyP^#+' cert_database=ssl/nss/client.crt__client-encrypted-pem.key.db",
 	"certificate authorization succeeds with correct client cert in encrypted PEM format"
 );
 
-# correct client cert in encrypted DER
-test_connect_ok(
-	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-der_tmp.key sslpassword='dUmmyP^#+'",
-	"certificate authorization succeeds with correct client cert in encrypted DER format"
-);
+SKIP:
+{
+	skip "NSS database not implemented in the Makefile", 1 if ($nss);
+	# correct client cert in encrypted DER
+	test_connect_ok(
+		$common_connstr,
+		"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-der_tmp.key sslpassword='dUmmyP^#+'",
+		"certificate authorization succeeds with correct client cert in encrypted DER format"
+	);
+}
 
 # correct client cert in encrypted PEM with wrong password
 test_connect_fails(
 	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='wrong'",
-	qr!\Qprivate key file "ssl/client-encrypted-pem_tmp.key": bad decrypt\E!,
+	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='wrong' cert_database=ssl/nss/client.crt__client-encrypted-pem.key.db",
+	qr!connection requires a valid client certificate|\Qprivate key file "ssl/client-encrypted-pem_tmp.key": bad decrypt\E!,
 	"certificate authorization fails with correct client cert and wrong password in encrypted PEM format"
 );
 
@@ -429,18 +533,19 @@ command_like(
 		'-P',
 		'null=_null_',
 		'-d',
-		"$common_connstr user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client_tmp.key",
+		"$common_connstr user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client_tmp.key cert_database=ssl/nss/client.crt__client.key.db",
 		'-c',
 		"SELECT * FROM pg_stat_ssl WHERE pid = pg_backend_pid()"
 	],
 	qr{^pid,ssl,version,cipher,bits,compression,client_dn,client_serial,issuer_dn\r?\n
-				^\d+,t,TLSv[\d.]+,[\w-]+,\d+,f,/CN=ssltestuser,1,\Q/CN=Test CA for PostgreSQL SSL regression test client certs\E\r?$}mx,
+				^\d+,t,TLSv[\d.]+,[\w-]+,\d+,f,/?CN=ssltestuser,1,/?\QCN=Test CA for PostgreSQL SSL regression test client certs\E\r?$}mx,
 	'pg_stat_ssl with client certificate');
 
 # client key with wrong permissions
 SKIP:
 {
 	skip "Permissions check not enforced on Windows", 2 if ($windows_os);
+	skip "Key not on filesystem with NSS",            2 if ($nss);
 
 	test_connect_fails(
 		$common_connstr,
@@ -453,10 +558,13 @@ SKIP:
 test_connect_fails(
 	$common_connstr,
 	"user=anotheruser sslcert=ssl/client.crt sslkey=ssl/client_tmp.key",
-	qr/certificate authentication failed for user "anotheruser"/,
+	qr/unable to verify certificate|certificate authentication failed for user "anotheruser"/,
 	"certificate authorization fails with client cert belonging to another user"
 );
 
+$common_connstr =
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client-revoked.crt__client-revoked.key.db";
+
 # revoked client cert
 test_connect_fails(
 	$common_connstr,
@@ -468,7 +576,7 @@ test_connect_fails(
 # works, iff username matches Common Name
 # fails, iff username doesn't match Common Name.
 $common_connstr =
-  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=verifydb hostaddr=$SERVERHOSTADDR";
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=verifydb hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client.crt__client.key.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -494,14 +602,18 @@ test_connect_ok(
 # intermediate client_ca.crt is provided by client, and isn't in server's ssl_ca_file
 switch_server_cert($node, 'server-cn-only', 'root_ca');
 $common_connstr =
-  "user=ssltestuser dbname=certdb sslkey=ssl/client_tmp.key sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR";
+  "user=ssltestuser dbname=certdb sslkey=ssl/client_tmp.key sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client+client_ca.crt__client.key.db";
 
 test_connect_ok(
 	$common_connstr,
 	"sslmode=require sslcert=ssl/client+client_ca.crt",
 	"intermediate client certificate is provided by client");
-test_connect_fails($common_connstr, "sslmode=require sslcert=ssl/client.crt",
-	qr/SSL error/, "intermediate client certificate is missing");
+
+test_connect_fails(
+	$common_connstr,
+	"sslmode=require sslcert=ssl/client.crt",
+	qr/connection requires a valid client certificate|SSL error/,
+	"intermediate client certificate is missing");
 
 # clean up
 
diff --git a/src/test/ssl/t/002_scram.pl b/src/test/ssl/t/002_scram.pl
index 3383b3e531..55fe3922e1 100644
--- a/src/test/ssl/t/002_scram.pl
+++ b/src/test/ssl/t/002_scram.pl
@@ -13,7 +13,26 @@ use lib $FindBin::RealBin;
 
 use SSL::Server;
 
-if ($ENV{with_ssl} ne 'openssl')
+my $openssl;
+my $nss;
+
+my $supports_tls_server_end_point;
+
+if ($ENV{with_ssl} eq 'openssl')
+{
+	$openssl = 1;
+	# Determine whether build supports tls-server-end-point.
+	$supports_tls_server_end_point =
+		check_pg_config("#define HAVE_X509_GET_SIGNATURE_NID 1");
+	plan tests => $supports_tls_server_end_point ? 9 : 10;
+}
+elsif ($ENV{with_ssl} eq 'nss')
+{
+	$nss = 1;
+	$supports_tls_server_end_point = 1;
+	plan tests => 9;
+}
+else
 {
 	plan skip_all => 'SSL not supported by this build';
 }
@@ -23,12 +42,6 @@ my $SERVERHOSTADDR = '127.0.0.1';
 # This is the pattern to use in pg_hba.conf to match incoming connections.
 my $SERVERHOSTCIDR = '127.0.0.1/32';
 
-# Determine whether build supports tls-server-end-point.
-my $supports_tls_server_end_point =
-  check_pg_config("#define HAVE_X509_GET_SIGNATURE_NID 1");
-
-my $number_of_tests = $supports_tls_server_end_point ? 9 : 10;
-
 # Allocation of base connection string shared among multiple tests.
 my $common_connstr;
 
@@ -97,7 +110,7 @@ my $client_tmp_key = "ssl/client_scram_tmp.key";
 copy("ssl/client.key", $client_tmp_key);
 chmod 0600, $client_tmp_key;
 test_connect_fails(
-	"sslcert=ssl/client.crt sslkey=$client_tmp_key sslrootcert=invalid hostaddr=$SERVERHOSTADDR",
+	"sslcert=ssl/client.crt sslkey=$client_tmp_key sslrootcert=invalid hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client.crt__client.key.db",
 	"dbname=certdb user=ssltestuser channel_binding=require",
 	qr/channel binding required, but server authenticated client without channel binding/,
 	"Cert authentication and channel_binding=require");
diff --git a/src/test/ssl/t/SSL/Backend/NSS.pm b/src/test/ssl/t/SSL/Backend/NSS.pm
new file mode 100644
index 0000000000..c5b31e584a
--- /dev/null
+++ b/src/test/ssl/t/SSL/Backend/NSS.pm
@@ -0,0 +1,73 @@
+package SSL::Backend::NSS;
+
+use strict;
+use warnings;
+use Exporter;
+
+our @ISA       = qw(Exporter);
+our @EXPORT_OK = qw(get_new_nss_backend);
+
+sub new
+{
+	my ($class) = @_;
+
+	my $self = { _library => 'NSS' };
+
+	bless $self, $class;
+
+	return $self;
+}
+
+sub get_new_nss_backend
+{
+	my $class = 'SSL::Backend::NSS';
+
+	return $class->new();
+}
+
+sub init
+{
+	# Make sure the certificate databases are in place?
+}
+
+sub get_library
+{
+	my ($self) = @_;
+
+	return $self->{_library};
+}
+
+sub set_server_cert
+{
+	my $self     = $_[0];
+	my $certfile = $_[1];
+	my $cafile   = $_[2];
+	my $keyfile  = $_[3];
+
+	my $cert_nickname;
+
+	if ($certfile =~ /native/)
+	{
+		$cert_nickname = $certfile;
+	}
+	else
+	{
+		$cert_nickname = $certfile . '.crt__' . $keyfile . '.key';
+	}
+	my $cert_database = $cert_nickname . '.db';
+
+	my $sslconf =
+	    "ssl_ca_file='$cafile.crt'\n"
+	  . "ssl_cert_file='ssl/$certfile.crt'\n"
+	  . "ssl_crl_file=''\n"
+	  . "ssl_database='nss/$cert_database'\n";
+
+	return $sslconf;
+}
+
+sub cleanup
+{
+	# Something?
+}
+
+1;
-- 
2.21.1 (Apple Git-122.3)

From 243948e1d5ebfd44e0a489813db673ccf6918269 Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Mon, 8 Feb 2021 23:52:34 +0100
Subject: [PATCH v26 03/10] Refactor SSL testharness for multiple library

The SSL testharness was fully tied to OpenSSL in the way the server was
set up and reconfigured. This refactors the SSLServer module into a SSL
library agnostic SSL/Server module which in turn use SSL/Backend/<lib>
modules for the implementation details.

No changes are done to the actual tests, this only change how setup and
teardown is performed.
---
 src/test/ssl/t/001_ssltests.pl                |  62 ++---------
 src/test/ssl/t/002_scram.pl                   |   6 +-
 src/test/ssl/t/SSL/Backend/OpenSSL.pm         | 103 ++++++++++++++++++
 .../ssl/t/{SSLServer.pm => SSL/Server.pm}     |  80 +++++++++++---
 4 files changed, 180 insertions(+), 71 deletions(-)
 create mode 100644 src/test/ssl/t/SSL/Backend/OpenSSL.pm
 rename src/test/ssl/t/{SSLServer.pm => SSL/Server.pm} (78%)

diff --git a/src/test/ssl/t/001_ssltests.pl b/src/test/ssl/t/001_ssltests.pl
index 7928de4e7c..a6d79e2bfc 100644
--- a/src/test/ssl/t/001_ssltests.pl
+++ b/src/test/ssl/t/001_ssltests.pl
@@ -4,20 +4,14 @@ use PostgresNode;
 use TestLib;
 use Test::More;
 
-use File::Copy;
-
 use FindBin;
 use lib $FindBin::RealBin;
 
-use SSLServer;
+use SSL::Server;
 
 if ($ENV{with_ssl} ne 'openssl')
 {
-	plan skip_all => 'OpenSSL not supported by this build';
-}
-else
-{
-	plan tests => 93;
+	plan skip_all => 'SSL not supported by this build';
 }
 
 #### Some configuration
@@ -32,32 +26,6 @@ my $SERVERHOSTCIDR = '127.0.0.1/32';
 # Allocation of base connection string shared among multiple tests.
 my $common_connstr;
 
-# The client's private key must not be world-readable, so take a copy
-# of the key stored in the code tree and update its permissions.
-#
-# This changes ssl/client.key to ssl/client_tmp.key etc for the rest
-# of the tests.
-my @keys = (
-	"client",     "client-revoked",
-	"client-der", "client-encrypted-pem",
-	"client-encrypted-der");
-foreach my $key (@keys)
-{
-	copy("ssl/${key}.key", "ssl/${key}_tmp.key")
-	  or die
-	  "couldn't copy ssl/${key}.key to ssl/${key}_tmp.key for permissions change: $!";
-	chmod 0600, "ssl/${key}_tmp.key"
-	  or die "failed to change permissions on ssl/${key}_tmp.key: $!";
-}
-
-# Also make a copy of that explicitly world-readable.  We can't
-# necessarily rely on the file in the source tree having those
-# permissions.  Add it to @keys to include it in the final clean
-# up phase.
-copy("ssl/client.key", "ssl/client_wrongperms_tmp.key");
-chmod 0644, "ssl/client_wrongperms_tmp.key";
-push @keys, 'client_wrongperms';
-
 #### Set up the server.
 
 note "setting up data directory";
@@ -72,32 +40,22 @@ $node->start;
 
 # Run this before we lock down access below.
 my $result = $node->safe_psql('postgres', "SHOW ssl_library");
-is($result, 'OpenSSL', 'ssl_library parameter');
+is($result, SSL::Server::ssl_library(), 'ssl_library parameter');
 
 configure_test_server_for_ssl($node, $SERVERHOSTADDR, $SERVERHOSTCIDR,
 	'trust');
 
 note "testing password-protected keys";
 
-open my $sslconf, '>', $node->data_dir . "/sslconfig.conf";
-print $sslconf "ssl=on\n";
-print $sslconf "ssl_cert_file='server-cn-only.crt'\n";
-print $sslconf "ssl_key_file='server-password.key'\n";
-print $sslconf "ssl_passphrase_command='echo wrongpassword'\n";
-close $sslconf;
-
+set_server_cert($node, 'server-cn-only', 'root+client_ca',
+				   'server-password', 'echo wrongpassword');
 command_fails(
 	[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
 	'restart fails with password-protected key file with wrong password');
 $node->_update_pid(0);
 
-open $sslconf, '>', $node->data_dir . "/sslconfig.conf";
-print $sslconf "ssl=on\n";
-print $sslconf "ssl_cert_file='server-cn-only.crt'\n";
-print $sslconf "ssl_key_file='server-password.key'\n";
-print $sslconf "ssl_passphrase_command='echo secret1'\n";
-close $sslconf;
-
+set_server_cert($node, 'server-cn-only', 'root+client_ca',
+				'server-password', 'echo secret1');
 command_ok(
 	[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
 	'restart succeeds with password-protected key file');
@@ -546,7 +504,5 @@ test_connect_fails($common_connstr, "sslmode=require sslcert=ssl/client.crt",
 	qr/SSL error/, "intermediate client certificate is missing");
 
 # clean up
-foreach my $key (@keys)
-{
-	unlink("ssl/${key}_tmp.key");
-}
+
+SSL::Server::cleanup();
diff --git a/src/test/ssl/t/002_scram.pl b/src/test/ssl/t/002_scram.pl
index 410b9e910d..3383b3e531 100644
--- a/src/test/ssl/t/002_scram.pl
+++ b/src/test/ssl/t/002_scram.pl
@@ -11,11 +11,11 @@ use File::Copy;
 use FindBin;
 use lib $FindBin::RealBin;
 
-use SSLServer;
+use SSL::Server;
 
 if ($ENV{with_ssl} ne 'openssl')
 {
-	plan skip_all => 'OpenSSL not supported by this build';
+	plan skip_all => 'SSL not supported by this build';
 }
 
 # This is the hostname used to connect to the server.
@@ -104,5 +104,3 @@ test_connect_fails(
 
 # clean up
 unlink($client_tmp_key);
-
-done_testing($number_of_tests);
diff --git a/src/test/ssl/t/SSL/Backend/OpenSSL.pm b/src/test/ssl/t/SSL/Backend/OpenSSL.pm
new file mode 100644
index 0000000000..62b11b7632
--- /dev/null
+++ b/src/test/ssl/t/SSL/Backend/OpenSSL.pm
@@ -0,0 +1,103 @@
+package SSL::Backend::OpenSSL;
+
+use strict;
+use warnings;
+use Exporter;
+use File::Copy;
+
+our @ISA       = qw(Exporter);
+our @EXPORT_OK = qw(get_new_openssl_backend);
+
+our (@keys);
+
+INIT
+{
+	@keys = (
+		"client",     "client-revoked",
+		"client-der", "client-encrypted-pem",
+		"client-encrypted-der");
+}
+
+sub new
+{
+	my ($class) = @_;
+
+	my $self = { _library => 'OpenSSL' };
+
+	bless $self, $class;
+
+	return $self;
+}
+
+sub get_new_openssl_backend
+{
+	my $class = 'SSL::Backend::OpenSSL';
+
+	my $backend = $class->new();
+
+	return $backend;
+}
+
+sub init
+{
+	# The client's private key must not be world-readable, so take a copy
+	# of the key stored in the code tree and update its permissions.
+	#
+	# This changes ssl/client.key to ssl/client_tmp.key etc for the rest
+	# of the tests.
+	foreach my $key (@keys)
+	{
+		copy("ssl/${key}.key", "ssl/${key}_tmp.key")
+		  or die
+		  "couldn't copy ssl/${key}.key to ssl/${key}_tmp.key for permissions change: $!";
+		chmod 0600, "ssl/${key}_tmp.key"
+		  or die "failed to change permissions on ssl/${key}_tmp.key: $!";
+	}
+
+	# Also make a copy of that explicitly world-readable.  We can't
+	# necessarily rely on the file in the source tree having those
+	# permissions. Add it to @keys to include it in the final clean
+	# up phase.
+	copy("ssl/client.key", "ssl/client_wrongperms_tmp.key")
+	  or die
+	  "couldn't copy ssl/client.key to ssl/client_wrongperms_tmp.key: $!";
+	chmod 0644, "ssl/client_wrongperms_tmp.key"
+	  or die
+	  "failed to change permissions on ssl/client_wrongperms_tmp.key: $!";
+	push @keys, 'client_wrongperms';
+}
+
+# Change the configuration to use given server cert file, and reload
+# the server so that the configuration takes effect.
+sub set_server_cert
+{
+	my $self     = $_[0];
+	my $certfile = $_[1];
+	my $cafile   = $_[2] || "root+client_ca";
+	my $keyfile  = $_[3] || $certfile;
+
+	my $sslconf =
+	    "ssl_ca_file='$cafile.crt'\n"
+	  . "ssl_cert_file='$certfile.crt'\n"
+	  . "ssl_key_file='$keyfile.key'\n"
+	  . "ssl_crl_file='root+client.crl'\n";
+
+	return $sslconf;
+}
+
+sub get_library
+{
+	my ($self) = @_;
+
+	return $self->{_library};
+}
+
+sub cleanup
+{
+	foreach my $key (@keys)
+	{
+		unlink("ssl/${key}_tmp.key");
+	}
+}
+
+1;
diff --git a/src/test/ssl/t/SSLServer.pm b/src/test/ssl/t/SSL/Server.pm
similarity index 78%
rename from src/test/ssl/t/SSLServer.pm
rename to src/test/ssl/t/SSL/Server.pm
index f5987a003e..ee901855b5 100644
--- a/src/test/ssl/t/SSLServer.pm
+++ b/src/test/ssl/t/SSL/Server.pm
@@ -23,19 +23,39 @@
 # explicitly because an invalid sslcert or sslrootcert, respectively,
 # causes those to be ignored.)
 
-package SSLServer;
+package SSL::Server;
 
 use strict;
 use warnings;
 use PostgresNode;
+use RecursiveCopy;
 use TestLib;
 use File::Basename;
 use File::Copy;
 use Test::More;
+use SSL::Backend::OpenSSL qw(get_new_openssl_backend);
+use SSL::Backend::NSS qw(get_new_nss_backend);
+
+our ($openssl, $nss, $backend);
+
+# The TLS backend which the server is using should be mostly transparent for
+# the user, apart from individual configuration settings, so keep the backend
+# specific things abstracted behind SSL::Server.
+if ($ENV{with_ssl} eq 'openssl')
+{
+	$backend = get_new_openssl_backend();
+	$openssl = 1;
+}
+elsif ($ENV{with_ssl} eq 'nss')
+{
+	$backend = get_new_nss_backend();
+	$nss     = 1;
+}
 
 use Exporter 'import';
 our @EXPORT = qw(
   configure_test_server_for_ssl
+  set_server_cert
   switch_server_cert
   test_connect_fails
   test_connect_ok
@@ -144,12 +164,19 @@ sub configure_test_server_for_ssl
 	close $sslconf;
 
 	# Copy all server certificates and keys, and client root cert, to the data dir
-	copy_files("ssl/server-*.crt", $pgdata);
-	copy_files("ssl/server-*.key", $pgdata);
-	chmod(0600, glob "$pgdata/server-*.key") or die $!;
-	copy_files("ssl/root+client_ca.crt", $pgdata);
-	copy_files("ssl/root_ca.crt",        $pgdata);
-	copy_files("ssl/root+client.crl",    $pgdata);
+	if (defined($openssl))
+	{
+		copy_files("ssl/server-*.crt", $pgdata);
+		copy_files("ssl/server-*.key", $pgdata);
+		chmod(0600, glob "$pgdata/server-*.key") or die $!;
+		copy_files("ssl/root+client_ca.crt", $pgdata);
+		copy_files("ssl/root_ca.crt",        $pgdata);
+		copy_files("ssl/root+client.crl",    $pgdata);
+	}
+	elsif (defined($nss))
+	{
+		RecursiveCopy::copypath("ssl/nss", $pgdata . "/nss") if -e "ssl/nss";
+	}
 
 	# Stop and restart server to load new listen_addresses.
 	$node->restart;
@@ -157,26 +184,51 @@ sub configure_test_server_for_ssl
 	# Change pg_hba after restart because hostssl requires ssl=on
 	configure_hba_for_ssl($node, $servercidr, $authmethod);
 
+	# Finally, perform backend specific configuration
+	$backend->init();
+
 	return;
 }
 
-# Change the configuration to use given server cert file, and reload
-# the server so that the configuration takes effect.
-sub switch_server_cert
+sub ssl_library
+{
+	return $backend->get_library();
+}
+
+sub cleanup
+{
+	$backend->cleanup();
+}
+
+# Change the configuration to use given server cert file,
+sub set_server_cert
 {
 	my $node     = $_[0];
 	my $certfile = $_[1];
 	my $cafile   = $_[2] || "root+client_ca";
+	my $keyfile  = $_[3] || '';
+	my $pwcmd    = $_[4] || '';
 	my $pgdata   = $node->data_dir;
 
+	$keyfile = $certfile if $keyfile eq '';
+
 	open my $sslconf, '>', "$pgdata/sslconfig.conf";
 	print $sslconf "ssl=on\n";
-	print $sslconf "ssl_ca_file='$cafile.crt'\n";
-	print $sslconf "ssl_cert_file='$certfile.crt'\n";
-	print $sslconf "ssl_key_file='$certfile.key'\n";
-	print $sslconf "ssl_crl_file='root+client.crl'\n";
+	print $sslconf $backend->set_server_cert($certfile, $cafile, $keyfile);
+	print $sslconf "ssl_passphrase_command='$pwcmd'\n"
+	  unless $pwcmd eq '';
 	close $sslconf;
+	return;
+}
 
+# Change the configuration to use given server cert file, and reload
+# the server so that the configuration takes effect.
+# Takes the same arguments as set_server_cert, which it calls to do that
+# piece of the work.
+sub switch_server_cert
+{
+	my $node = $_[0];
+	set_server_cert(@_);
 	$node->restart;
 	return;
 }
-- 
2.21.1 (Apple Git-122.3)

From 8760fe28fff4842011c12fb0a29c22d0c3c11677 Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Mon, 8 Feb 2021 23:52:31 +0100
Subject: [PATCH v26 02/10] nss: Remove mentions and infra of OpenSSL being the
 only TLS lib

This rewords comments and messages which indicate that --with-ssl only
has a single possible value, as well as moves OpenSSL specific code in
USE_SSL into USE_OPENSSL.

While in there, remove a trailing period from a single-line OpenSSL
comment to better match project style.
---
 src/backend/libpq/hba.c          | 2 +-
 src/include/libpq/libpq-be.h     | 5 +++--
 src/include/pg_config_manual.h   | 3 +--
 src/interfaces/libpq/fe-secure.c | 5 ++++-
 src/interfaces/libpq/libpq-fe.h  | 2 +-
 5 files changed, 10 insertions(+), 7 deletions(-)

diff --git a/src/backend/libpq/hba.c b/src/backend/libpq/hba.c
index 20bf1461ce..9a04c093d5 100644
--- a/src/backend/libpq/hba.c
+++ b/src/backend/libpq/hba.c
@@ -1041,7 +1041,7 @@ parse_hba_line(TokenizedLine *tok_line, int elevel)
 			ereport(elevel,
 					(errcode(ERRCODE_CONFIG_FILE_ERROR),
 					 errmsg("hostssl record cannot match because SSL is not supported by this build"),
-					 errhint("Compile with --with-ssl=openssl to use SSL connections."),
+					 errhint("Compile with --with-ssl to use SSL connections."),
 					 errcontext("line %d of configuration file \"%s\"",
 								line_num, HbaFileName)));
 			*err_msg = "hostssl record cannot match because SSL is not supported by this build";
diff --git a/src/include/libpq/libpq-be.h b/src/include/libpq/libpq-be.h
index bc86fdfcdb..ea373a0ae0 100644
--- a/src/include/libpq/libpq-be.h
+++ b/src/include/libpq/libpq-be.h
@@ -193,8 +193,9 @@ typedef struct Port
 	bool		peer_cert_valid;
 
 	/*
-	 * OpenSSL structures. (Keep these last so that the locations of other
-	 * fields are the same whether or not you build with OpenSSL.)
+	 * SSL backend specific structures. (Keep these last so that the locations
+	 * of other fields are the same whether or not you build with SSL
+	 * enabled.)
 	 */
 #ifdef USE_OPENSSL
 	SSL		   *ssl;
diff --git a/src/include/pg_config_manual.h b/src/include/pg_config_manual.h
index 0e50f61b94..7861b94290 100644
--- a/src/include/pg_config_manual.h
+++ b/src/include/pg_config_manual.h
@@ -176,8 +176,7 @@
 
 /*
  * USE_SSL code should be compiled only when compiling with an SSL
- * implementation.  (Currently, only OpenSSL is supported, but we might add
- * more implementations in the future.)
+ * implementation.
  */
 #if defined(USE_OPENSSL) || defined(USE_NSS)
 #define USE_SSL
diff --git a/src/interfaces/libpq/fe-secure.c b/src/interfaces/libpq/fe-secure.c
index 83ebd05ce5..3f726663f6 100644
--- a/src/interfaces/libpq/fe-secure.c
+++ b/src/interfaces/libpq/fe-secure.c
@@ -421,6 +421,9 @@ PQsslAttributeNames(PGconn *conn)
 
 	return result;
 }
+#endif							/* USE_SSL */
+
+#ifndef USE_OPENSSL
 
 PQsslKeyPassHook_OpenSSL_type
 PQgetSSLKeyPassHook_OpenSSL(void)
@@ -439,7 +442,7 @@ PQdefaultSSLKeyPassHook_OpenSSL(char *buf, int size, PGconn *conn)
 {
 	return 0;
 }
-#endif							/* USE_SSL */
+#endif							/* USE_OPENSSL */
 
 #ifndef USE_NSS
 
diff --git a/src/interfaces/libpq/libpq-fe.h b/src/interfaces/libpq/libpq-fe.h
index 59ce0815cf..aba32e6635 100644
--- a/src/interfaces/libpq/libpq-fe.h
+++ b/src/interfaces/libpq/libpq-fe.h
@@ -619,7 +619,7 @@ extern int	pg_valid_server_encoding_id(int encoding);
 
 /* === in fe-secure-openssl.c === */
 
-/* Support for overriding sslpassword handling with a callback. */
+/* Support for overriding sslpassword handling with a callback */
 typedef int (*PQsslKeyPassHook_OpenSSL_type) (char *buf, int size, PGconn *conn);
 extern PQsslKeyPassHook_OpenSSL_type PQgetSSLKeyPassHook_OpenSSL(void);
 extern void PQsetSSLKeyPassHook_OpenSSL(PQsslKeyPassHook_OpenSSL_type hook);
-- 
2.21.1 (Apple Git-122.3)

From 7dbc26afad4d3e07c223e88102310fba27fc9519 Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Mon, 8 Feb 2021 23:52:22 +0100
Subject: [PATCH v26 01/10] nss: Support libnss as TLS library in libpq

This commit contains the frontend and backend portion of TLS support
in libpq to allow encrypted connections. The implementation is done
as a drop-in replacement for the OpenSSL support and leverages the
same internal API for abstracting library specific details.

A new GUC, ssl_database, is used to identify the NSS database used for
the serverside certificates and keys. The existing certificate and key
GUCs are used for providing certificate and key nicknames.

Client side there is a new connection parameter, cert_database, to
identify the client cert and key. All existing sslmodes are supported
in the same way as with OpenSSL.

Authors: Daniel Gustafsson, Andrew Dunstan, Jacob Champion
Reviewed-by: Michael Paquier
---
 .../postgres_fdw/expected/postgres_fdw.out    |    2 +-
 src/backend/libpq/auth.c                      |    7 +
 src/backend/libpq/be-secure-nss.c             | 1366 +++++++++++++++++
 src/backend/libpq/be-secure.c                 |    3 +
 src/backend/utils/misc/guc.c                  |   20 +-
 src/common/cipher_nss.c                       |  192 +++
 src/include/common/nss.h                      |   49 +
 src/include/libpq/libpq-be.h                  |   10 +-
 src/include/libpq/libpq.h                     |    3 +
 src/include/pg_config_manual.h                |    2 +-
 src/interfaces/libpq/fe-connect.c             |    4 +
 src/interfaces/libpq/fe-secure-nss.c          | 1076 +++++++++++++
 src/interfaces/libpq/fe-secure.c              |   21 +
 src/interfaces/libpq/libpq-fe.h               |   11 +
 src/interfaces/libpq/libpq-int.h              |   25 +-
 15 files changed, 2786 insertions(+), 5 deletions(-)
 create mode 100644 src/backend/libpq/be-secure-nss.c
 create mode 100644 src/common/cipher_nss.c
 create mode 100644 src/include/common/nss.h
 create mode 100644 src/interfaces/libpq/fe-secure-nss.c

diff --git a/contrib/postgres_fdw/expected/postgres_fdw.out b/contrib/postgres_fdw/expected/postgres_fdw.out
index 60c7e115d6..3bec874fa6 100644
--- a/contrib/postgres_fdw/expected/postgres_fdw.out
+++ b/contrib/postgres_fdw/expected/postgres_fdw.out
@@ -8946,7 +8946,7 @@ DO $d$
     END;
 $d$;
 ERROR:  invalid option "password"
-HINT:  Valid options in this context are: service, passfile, channel_binding, connect_timeout, dbname, host, hostaddr, port, options, application_name, keepalives, keepalives_idle, keepalives_interval, keepalives_count, tcp_user_timeout, sslmode, sslcompression, sslcert, sslkey, sslrootcert, sslcrl, requirepeer, ssl_min_protocol_version, ssl_max_protocol_version, gssencmode, krbsrvname, gsslib, target_session_attrs, use_remote_estimate, fdw_startup_cost, fdw_tuple_cost, extensions, updatable, fetch_size, batch_size
+HINT:  Valid options in this context are: service, passfile, channel_binding, connect_timeout, dbname, host, hostaddr, port, options, application_name, keepalives, keepalives_idle, keepalives_interval, keepalives_count, tcp_user_timeout, sslmode, sslcompression, sslcert, sslkey, sslrootcert, sslcrl, requirepeer, ssl_min_protocol_version, ssl_max_protocol_version, gssencmode, krbsrvname, gsslib, target_session_attrs, cert_database, use_remote_estimate, fdw_startup_cost, fdw_tuple_cost, extensions, updatable, fetch_size, batch_size
 CONTEXT:  SQL statement "ALTER SERVER loopback_nopw OPTIONS (ADD password 'dummypw')"
 PL/pgSQL function inline_code_block line 3 at EXECUTE
 -- If we add a password for our user mapping instead, we should get a different
diff --git a/src/backend/libpq/auth.c b/src/backend/libpq/auth.c
index 545635f41a..09ad2ad063 100644
--- a/src/backend/libpq/auth.c
+++ b/src/backend/libpq/auth.c
@@ -2849,7 +2849,14 @@ CheckCertAuth(Port *port)
 {
 	int			status_check_usermap = STATUS_ERROR;
 
+#if defined(USE_OPENSSL)
 	Assert(port->ssl);
+#elif defined(USE_NSS)
+	/* TODO: should we rename pr_fd to ssl, to keep consistency? */
+	Assert(port->pr_fd);
+#else
+	Assert(false);
+#endif
 
 	/* Make sure we have received a username in the certificate */
 	if (port->peer_cn == NULL ||
diff --git a/src/backend/libpq/be-secure-nss.c b/src/backend/libpq/be-secure-nss.c
new file mode 100644
index 0000000000..637d47e3c6
--- /dev/null
+++ b/src/backend/libpq/be-secure-nss.c
@@ -0,0 +1,1366 @@
+/*-------------------------------------------------------------------------
+ *
+ * be-secure-nss.c
+ *	  functions for supporting NSS as a TLS backend
+ *
+ *
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ *	  src/backend/libpq/be-secure-nss.c
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#include "postgres.h"
+
+#include <sys/stat.h>
+
+#include "common/nss.h"
+
+/*
+ * The nspr/obsolete/protypes.h NSPR header typedefs uint64 and int64 with
+ * colliding definitions from ours, causing a much expected compiler error.
+ * Remove backwards compatibility with ancient NSPR versions to avoid this.
+ */
+#define NO_NSPR_10_SUPPORT
+#include <nspr/nspr.h>
+#include <nspr/prerror.h>
+#include <nspr/prio.h>
+#include <nspr/prmem.h>
+#include <nspr/prtypes.h>
+
+#include <nss/nss.h>
+#include <nss/base64.h>
+#include <nss/cert.h>
+#include <nss/certdb.h>
+#include <nss/hasht.h>
+#include <nss/keyhi.h>
+#include <nss/pk11pub.h>
+#include <nss/secder.h>
+#include <nss/secerr.h>
+#include <nss/secitem.h>
+#include <nss/secoidt.h>
+#include <nss/secport.h>
+#include <nss/ssl.h>
+#include <nss/sslerr.h>
+#include <nss/sslproto.h>
+
+#include "lib/stringinfo.h"
+#include "libpq/libpq.h"
+#include "nodes/pg_list.h"
+#include "miscadmin.h"
+#include "storage/fd.h"
+#include "utils/guc.h"
+#include "utils/memutils.h"
+
+
+/* default init hook can be overridden by a shared library */
+static void default_nss_tls_init(bool isServerStart);
+nss_tls_init_hook_type nss_tls_init_hook = default_nss_tls_init;
+
+static PRDescIdentity pr_id;
+
+static PRIOMethods pr_iomethods;
+static NSSInitContext *nss_context = NULL;
+static SSLVersionRange desired_sslver;
+
+static char *external_ssl_passphrase_cb(PK11SlotInfo *slot, PRBool retry, void *arg);
+static SECStatus pg_SSLShutdownFunc(void *private_data, void *nss_data);
+static bool dummy_ssl_passwd_cb_called = false;
+static bool ssl_is_server_start;
+
+/*
+ * PR_ImportTCPSocket() is a private API, but very widely used, as it's the
+ * only way to make NSS use an already set up POSIX file descriptor rather
+ * than opening one itself. To quote the NSS documentation:
+ *
+ *		"In theory, code that uses PR_ImportTCPSocket may break when NSPR's
+ *		implementation changes. In practice, this is unlikely to happen because
+ *		NSPR's implementation has been stable for years and because of NSPR's
+ *		strong commitment to backward compatibility."
+ *
+ * https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSPR/Reference/PR_ImportTCPSocket
+ *
+ * The function is declared in <private/pprio.h>, but as it is a header marked
+ * private we declare it here rather than including it.
+ */
+NSPR_API(PRFileDesc *) PR_ImportTCPSocket(int);
+
+/* NSS IO layer callback overrides */
+static PRInt32 pg_ssl_read(PRFileDesc *fd, void *buf, PRInt32 amount,
+						   PRIntn flags, PRIntervalTime timeout);
+static PRInt32 pg_ssl_write(PRFileDesc *fd, const void *buf, PRInt32 amount,
+							PRIntn flags, PRIntervalTime timeout);
+static PRStatus pg_ssl_close(PRFileDesc *fd);
+/* Utility functions */
+static PRFileDesc *init_iolayer(Port *port);
+static uint16 ssl_protocol_version_to_nss(int v, const char *guc_name);
+
+static char *pg_SSLerrmessage(PRErrorCode errcode);
+static char *ssl_protocol_version_to_string(int v);
+static SECStatus pg_cert_auth_handler(void *arg, PRFileDesc *fd,
+									  PRBool checksig, PRBool isServer);
+static SECStatus pg_bad_cert_handler(void *arg, PRFileDesc *fd);
+static char *dummy_ssl_passphrase_cb(PK11SlotInfo *slot, PRBool retry, void *arg);
+
+/* ------------------------------------------------------------ */
+/*						 Public interface						*/
+/* ------------------------------------------------------------ */
+
+/*
+ * be_tls_init
+ *			Initialize the nss TLS library in the postmaster
+ *
+ * The majority of the setup needs to happen in be_tls_open_server since the
+ * NSPR initialization must happen after the forking of the backend. We could
+ * potentially move some parts in under !isServerStart, but so far this is the
+ * separation chosen.
+ */
+int
+be_tls_init(bool isServerStart)
+{
+	SECStatus	status;
+	SSLVersionRange supported_sslver;
+
+	status = SSL_ConfigServerSessionIDCacheWithOpt(0, 0, NULL, 1, 0, 0, PR_FALSE);
+	if (status != SECSuccess)
+	{
+		ereport(isServerStart ? FATAL : LOG,
+				(errmsg("unable to connect to TLS connection cache: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+		return -1;
+	}
+
+	if (!ssl_database || strlen(ssl_database) == 0)
+	{
+		ereport(isServerStart ? FATAL : LOG,
+				(errmsg("no certificate database specified")));
+		return -1;
+	}
+
+	/*
+	 * We check for the desired TLS version range here, even though we cannot
+	 * set it until be_open_server such that we can be compatible with how the
+	 * OpenSSL backend reports errors for incompatible range configurations.
+	 * Set either the default supported TLS version range, or the configured
+	 * range from ssl_min_protocol_version and ssl_max_protocol version. In
+	 * case the user hasn't defined the maximum allowed version we fall back
+	 * to the highest version TLS that the library supports.
+	 */
+	if (SSL_VersionRangeGetSupported(ssl_variant_stream, &supported_sslver) != SECSuccess)
+	{
+		ereport(isServerStart ? FATAL : LOG,
+				(errmsg("unable to get default protocol support from NSS")));
+		return -1;
+	}
+
+	/*
+	 * Set the fallback versions for the TLS protocol version range to a
+	 * combination of our minimal requirement and the library maximum. Error
+	 * messages should be kept identical to those in be-secure-openssl.c to
+	 * make translations easier.
+	 */
+	desired_sslver.min = SSL_LIBRARY_VERSION_TLS_1_0;
+	desired_sslver.max = supported_sslver.max;
+
+	if (ssl_min_protocol_version)
+	{
+		int			ver = ssl_protocol_version_to_nss(ssl_min_protocol_version,
+													  "ssl_min_protocol_version");
+
+		if (ver == -1)
+		{
+			ereport(isServerStart ? FATAL : LOG,
+					(errmsg("\"%s\" setting \"%s\" not supported by this build",
+							"ssl_min_protocol_version",
+							GetConfigOption("ssl_min_protocol_version",
+											false, false))));
+			return -1;
+		}
+
+		if (ver > 0)
+			desired_sslver.min = ver;
+	}
+
+	if (ssl_max_protocol_version)
+	{
+		int			ver = ssl_protocol_version_to_nss(ssl_max_protocol_version,
+													  "ssl_max_protocol_version");
+
+		if (ver == -1)
+		{
+			ereport(isServerStart ? FATAL : LOG,
+					(errmsg("\"%s\" setting \"%s\" not supported by this build",
+							"ssl_max_protocol_version",
+							GetConfigOption("ssl_max_protocol_version",
+											false, false))));
+			return -1;
+		}
+		if (ver > 0)
+			desired_sslver.max = ver;
+
+		if (ver < desired_sslver.min)
+		{
+			ereport(isServerStart ? FATAL : LOG,
+					(errmsg("could not set SSL protocol version range"),
+					 errdetail("\"%s\" cannot be higher than \"%s\"",
+							   "ssl_min_protocol_version",
+							   "ssl_max_protocol_version")));
+			return -1;
+		}
+	}
+
+	/*
+	 * Set the passphrase callback which will be used both to obtain the
+	 * passphrase from the user, as well as by NSS to obtain the phrase
+	 * repeatedly.
+	 */
+	ssl_is_server_start = isServerStart;
+	(*nss_tls_init_hook) (isServerStart);
+
+	return 0;
+}
+
+int
+be_tls_open_server(Port *port)
+{
+	SECStatus	status;
+	PRFileDesc *model;
+	PRFileDesc *pr_fd;
+	PRFileDesc *layer;
+	CERTCertificate *server_cert;
+	SECKEYPrivateKey *private_key;
+	CERTSignedCrl *crl;
+	SECItem		crlname;
+	char	   *cert_database;
+	NSSInitParameters params;
+
+	/*
+	 * The NSPR documentation states that runtime initialization via PR_Init
+	 * is no longer required, as the first caller into NSPR will perform the
+	 * initialization implicitly. The documentation doesn't however clarify
+	 * from which version this is holds true, so let's perform the potentially
+	 * superfluous initialization anyways to avoid crashing on older versions
+	 * of NSPR, as there is no difference in overhead.  The NSS documentation
+	 * still states that PR_Init must be called in some way (implicitly or
+	 * explicitly).
+	 *
+	 * The below parameters are what the implicit initialization would've done
+	 * for us, and should work even for older versions where it might not be
+	 * done automatically. The last parameter, maxPTDs, is set to various
+	 * values in other codebases, but has been unused since NSPR 2.1 which was
+	 * released sometime in 1998. In current versions of NSPR all parameters
+	 * are ignored.
+	 */
+	PR_Init(PR_USER_THREAD, PR_PRIORITY_NORMAL, 0 /* maxPTDs */ );
+
+	/*
+	 * The certificate path (configdir) must contain a valid NSS database. If
+	 * the certificate path isn't a valid directory, NSS will fall back on the
+	 * system certificate database. If the certificate path is a directory but
+	 * is empty then the initialization will fail. On the client side this can
+	 * be allowed for any sslmode but the verify-xxx ones.
+	 * https://bugzilla.redhat.com/show_bug.cgi?id=728562 For the server side
+	 * we won't allow this to fail however, as we require the certificate and
+	 * key to exist.
+	 *
+	 * The original design of NSS was for a single application to use a single
+	 * copy of it, initialized with NSS_Initialize() which isn't returning any
+	 * handle with which to refer to NSS. NSS initialization and shutdown are
+	 * global for the application, so a shutdown in another NSS enabled
+	 * library would cause NSS to be stopped for libpq as well.  The fix has
+	 * been to introduce NSS_InitContext which returns a context handle to
+	 * pass to NSS_ShutdownContext.  NSS_InitContext was introduced in NSS
+	 * 3.12, but the use of it is not very well documented.
+	 * https://bugzilla.redhat.com/show_bug.cgi?id=738456
+	 *
+	 * The InitParameters struct passed can be used to override internal
+	 * values in NSS, but the usage is not documented at all. When using
+	 * NSS_Init initializations, the values are instead set via PK11_Configure
+	 * calls so the PK11_Configure documentation can be used to glean some
+	 * details on these.
+	 *
+	 * https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS/PKCS11/Module_Specs
+	 */
+	memset(&params, '\0', sizeof(params));
+	params.length = sizeof(params);
+
+	if (!ssl_database || strlen(ssl_database) == 0)
+		ereport(FATAL,
+				(errmsg("no certificate database specified")));
+
+	cert_database = psprintf("sql:%s", ssl_database);
+	nss_context = NSS_InitContext(cert_database, "", "", "",
+								  &params,
+								  NSS_INIT_READONLY | NSS_INIT_PK11RELOAD);
+	pfree(cert_database);
+
+	if (!nss_context)
+		ereport(FATAL,
+				(errmsg("unable to read certificate database \"%s\": %s",
+						ssl_database, pg_SSLerrmessage(PR_GetError()))));
+
+	/*
+	 * Import the already opened socket as we don't want to use NSPR functions
+	 * for opening the network socket due to how the PostgreSQL protocol works
+	 * with TLS connections. This function is not part of the NSPR public API,
+	 * see the comment at the top of the file for the rationale of still using
+	 * it.
+	 */
+	pr_fd = PR_ImportTCPSocket(port->sock);
+	if (!pr_fd)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to connect to socket")));
+		return -1;
+	}
+
+	/*
+	 * Most of the documentation available, and implementations of, NSS/NSPR
+	 * use the PR_NewTCPSocket() function here, which has the drawback that it
+	 * can only create IPv4 sockets. Instead use PR_OpenTCPSocket() which
+	 * copes with IPv6 as well.
+	 *
+	 * We use a model filedescriptor here which is a construct in NSPR/NSS in
+	 * order to create a configuration template for sockets which can then be
+	 * applied to new sockets created. This makes more sense in a server which
+	 * accepts multiple connections and want to perform the boilerplate just
+	 * once, but it does provide a nice abstraction here as well in that we
+	 * can error out early without having performed any operation on the real
+	 * socket.
+	 */
+	model = PR_OpenTCPSocket(port->laddr.addr.ss_family);
+	if (!model)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to open socket")));
+		return -1;
+	}
+
+	/*
+	 * Convert the NSPR socket to an SSL socket. Ensuring the success of this
+	 * operation is critical as NSS SSL_* functions may return SECSuccess on
+	 * the socket even though SSL hasn't been enabled, which introduce a risk
+	 * of silent downgrades.
+	 */
+	model = SSL_ImportFD(NULL, model);
+	if (!model)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to enable TLS on socket")));
+		return -1;
+	}
+
+	/*
+	 * Configure basic settings for the connection over the SSL socket in
+	 * order to set it up as a server.
+	 */
+	if (SSL_OptionSet(model, SSL_SECURITY, PR_TRUE) != SECSuccess)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to configure TLS connection")));
+		return -1;
+	}
+
+	if (SSL_OptionSet(model, SSL_HANDSHAKE_AS_SERVER, PR_TRUE) != SECSuccess ||
+		SSL_OptionSet(model, SSL_HANDSHAKE_AS_CLIENT, PR_FALSE) != SECSuccess)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to configure TLS connection as server")));
+		return -1;
+	}
+
+	/*
+	 * SSLv2 is disabled by default, and SSLv3 will be excluded from the range
+	 * of allowed protocols further down. Since we really don't want these to
+	 * ever be enabled, let's use belts and suspenders and explicitly turn
+	 * them off as well.
+	 */
+	SSL_OptionSet(model, SSL_ENABLE_SSL2, PR_FALSE);
+	SSL_OptionSet(model, SSL_ENABLE_SSL3, PR_FALSE);
+
+#ifdef SSL_CBC_RANDOM_IV
+
+	/*
+	 * Enable protection against the BEAST attack in case the NSS server has
+	 * support for that. While SSLv3 is disabled, we may still allow TLSv1
+	 * which is affected. The option isn't documented as an SSL option, but as
+	 * an NSS environment variable.
+	 */
+	SSL_OptionSet(model, SSL_CBC_RANDOM_IV, PR_TRUE);
+#endif
+
+	/*
+	 * Configure the allowed ciphers. If there are no user preferred suites,
+	 * set the domestic policy.
+	 *
+	 * Historically there were different cipher policies based on export (and
+	 * import) restrictions: Domestic, Export and France. These are since long
+	 * removed with all ciphers being enabled by default. Due to backwards
+	 * compatibility, the old API is still used even though all three policies
+	 * now do the same thing.
+	 *
+	 * If SSLCipherSuites define a policy of the user, we set that rather than
+	 * enabling all ciphers via NSS_SetDomesticPolicy.
+	 *
+	 * TODO: while this code works, the set of ciphers which can be set and
+	 * still end up with a working socket is woefully underdocumented for
+	 * anything more recent than SSLv3 (the code for TLS actually calls ssl3
+	 * functions under the hood for SSL_CipherPrefSet), so it's unclear if
+	 * this is helpful or not. Using the policies works, but may be too
+	 * coarsely grained.
+	 *
+	 * Another TODO: The SSL_ImplementedCiphers table returned with calling
+	 * SSL_GetImplementedCiphers is sorted in server preference order. Sorting
+	 * SSLCipherSuites according to the order of the ciphers therein could be
+	 * a way to implement ssl_prefer_server_ciphers - if we at all want to use
+	 * cipher selection for NSS like how we do it for OpenSSL that is.
+	 */
+
+	/*
+	 * If no ciphers are specified, enable them all.
+	 */
+	if (!SSLCipherSuites || strlen(SSLCipherSuites) == 0)
+	{
+		status = NSS_SetDomesticPolicy();
+		if (status != SECSuccess)
+		{
+			ereport(COMMERROR,
+					(errmsg("unable to set cipher policy: %s",
+							pg_SSLerrmessage(PR_GetError()))));
+			return -1;
+		}
+	}
+	else
+	{
+		char	   *ciphers,
+				   *c;
+
+		char	   *sep = ":;, ";
+		PRUint16	ciphercode;
+		const		PRUint16 *nss_ciphers;
+
+		/*
+		 * If the user has specified a set of preferred cipher suites we start
+		 * by turning off all the existing suites to avoid the risk of down-
+		 * grades to a weaker cipher than expected.
+		 */
+		nss_ciphers = SSL_GetImplementedCiphers();
+		for (int i = 0; i < SSL_GetNumImplementedCiphers(); i++)
+			SSL_CipherPrefSet(model, nss_ciphers[i], PR_FALSE);
+
+		ciphers = pstrdup(SSLCipherSuites);
+
+		for (c = strtok(ciphers, sep); c; c = strtok(NULL, sep))
+		{
+			if (!pg_find_cipher(c, &ciphercode))
+			{
+				status = SSL_CipherPrefSet(model, ciphercode, PR_TRUE);
+				if (status != SECSuccess)
+				{
+					ereport(COMMERROR,
+							(errmsg("invalid cipher-suite specified: %s", c)));
+					return -1;
+				}
+			}
+		}
+
+		pfree(ciphers);
+	}
+
+	if (SSL_VersionRangeSet(model, &desired_sslver) != SECSuccess)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to set requested SSL protocol version range")));
+		return -1;
+	}
+
+	/*
+	 * Set up the custom IO layer.
+	 */
+	layer = init_iolayer(port);
+	if (!layer)
+		return -1;
+
+	if (PR_PushIOLayer(pr_fd, PR_TOP_IO_LAYER, layer) != PR_SUCCESS)
+	{
+		PR_Close(layer);
+		ereport(COMMERROR,
+				(errmsg("unable to push IO layer")));
+		return -1;
+	}
+
+	server_cert = PK11_FindCertFromNickname(ssl_cert_file, (void *) port);
+	if (!server_cert)
+	{
+		if (dummy_ssl_passwd_cb_called)
+		{
+			ereport(COMMERROR,
+					(errmsg("unable to load certificate for \"%s\": %s",
+							ssl_cert_file, pg_SSLerrmessage(PR_GetError())),
+					 errhint("The certificate requires a password.")));
+			return -1;
+		}
+		else
+		{
+			ereport(COMMERROR,
+					(errmsg("unable to find certificate for \"%s\": %s",
+							ssl_cert_file, pg_SSLerrmessage(PR_GetError()))));
+			return -1;
+		}
+	}
+
+	private_key = PK11_FindKeyByAnyCert(server_cert, (void *) port);
+	if (!private_key)
+	{
+		if (dummy_ssl_passwd_cb_called)
+		{
+			ereport(COMMERROR,
+					(errmsg("unable to load private key for \"%s\": %s",
+							ssl_cert_file, pg_SSLerrmessage(PR_GetError())),
+					 errhint("The private key requires a password.")));
+			return -1;
+		}
+		else
+		{
+			ereport(COMMERROR,
+					(errmsg("unable to find private key for \"%s\": %s",
+							ssl_cert_file, pg_SSLerrmessage(PR_GetError()))));
+			return -1;
+		}
+	}
+
+	/*
+	 * NSS doesn't use CRL files on disk, so we use the ssl_crl_file guc to
+	 * contain the CRL nickname for the current server certificate in the NSS
+	 * certificate database. The main difference from the OpenSSL backend is
+	 * that NSS will use the CRL regardless, but being able to make sure the
+	 * CRL is loaded seems like a good feature.
+	 */
+	if (ssl_crl_file[0])
+	{
+		SECITEM_CopyItem(NULL, &crlname, &server_cert->derSubject);
+		crl = SEC_FindCrlByName(CERT_GetDefaultCertDB(), &crlname, SEC_CRL_TYPE);
+		if (!crl)
+		{
+			ereport(COMMERROR,
+					(errmsg("specified CRL not found in database")));
+			return -1;
+		}
+		SEC_DestroyCrl(crl);
+	}
+
+	/*
+	 * Finally we must configure the socket for being a server by setting the
+	 * certificate and key. The NULL parameter is an SSLExtraServerCertData
+	 * pointer with the final parameter being the size of the extra server
+	 * cert data structure pointed to. This is typically only used for
+	 * credential delegation.
+	 */
+	status = SSL_ConfigServerCert(model, server_cert, private_key, NULL, 0);
+	if (status != SECSuccess)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to configure server for TLS server connections: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+		return -1;
+	}
+
+	ssl_loaded_verify_locations = true;
+
+	/*
+	 * At this point, we no longer have use for the certificate and private
+	 * key as they have been copied into the context by NSS. Destroy our
+	 * copies explicitly to clean out the memory as best we can.
+	 */
+	CERT_DestroyCertificate(server_cert);
+	SECKEY_DestroyPrivateKey(private_key);
+
+	/* Set up certificate authentication callback */
+	status = SSL_AuthCertificateHook(model, pg_cert_auth_handler, (void *) port);
+	if (status != SECSuccess)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to install authcert hook: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+		return -1;
+	}
+	SSL_BadCertHook(model, pg_bad_cert_handler, (void *) port);
+	SSL_OptionSet(model, SSL_REQUEST_CERTIFICATE, PR_TRUE);
+	SSL_OptionSet(model, SSL_REQUIRE_CERTIFICATE, PR_FALSE);
+
+	port->pr_fd = SSL_ImportFD(model, pr_fd);
+	if (!port->pr_fd)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to initialize")));
+		return -1;
+	}
+
+	PR_Close(model);
+
+	/*
+	 * Force a handshake on the next I/O request, the second parameter means
+	 * that we are a server, PR_FALSE would indicate being a client. NSPR
+	 * requires us to call SSL_ResetHandshake since we imported an already
+	 * established socket.
+	 */
+	status = SSL_ResetHandshake(port->pr_fd, PR_TRUE);
+	if (status != SECSuccess)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to initiate handshake: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+		return -1;
+	}
+	status = SSL_ForceHandshake(port->pr_fd);
+	if (status != SECSuccess)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to handshake: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+		return -1;
+	}
+
+	port->ssl_in_use = true;
+
+	/* Register out shutdown callback */
+	NSS_RegisterShutdown(pg_SSLShutdownFunc, port);
+
+	return 0;
+}
+
+ssize_t
+be_tls_read(Port *port, void *ptr, size_t len, int *waitfor)
+{
+	ssize_t		n_read;
+	PRErrorCode err;
+
+	n_read = PR_Read(port->pr_fd, ptr, len);
+
+	if (n_read < 0)
+	{
+		err = PR_GetError();
+
+		if (err == PR_WOULD_BLOCK_ERROR)
+		{
+			*waitfor = WL_SOCKET_READABLE;
+			errno = EWOULDBLOCK;
+		}
+		else
+			errno = ECONNRESET;
+	}
+
+	return n_read;
+}
+
+ssize_t
+be_tls_write(Port *port, void *ptr, size_t len, int *waitfor)
+{
+	ssize_t		n_write;
+	PRErrorCode err;
+	PRIntn		flags = 0;
+
+	/*
+	 * The flags parameter to PR_Send is no longer used and is, according to
+	 * the documentation, required to be zero.
+	 */
+	n_write = PR_Send(port->pr_fd, ptr, len, flags, PR_INTERVAL_NO_WAIT);
+
+	if (n_write < 0)
+	{
+		err = PR_GetError();
+
+		if (err == PR_WOULD_BLOCK_ERROR)
+		{
+			*waitfor = WL_SOCKET_WRITEABLE;
+			errno = EWOULDBLOCK;
+		}
+		else
+			errno = ECONNRESET;
+	}
+
+	return n_write;
+}
+
+void
+be_tls_close(Port *port)
+{
+	if (!port)
+		return;
+
+	if (port->peer_cn)
+	{
+		SSL_InvalidateSession(port->pr_fd);
+		pfree(port->peer_cn);
+		port->peer_cn = NULL;
+	}
+
+	PR_Close(port->pr_fd);
+	port->pr_fd = NULL;
+	port->ssl_in_use = false;
+
+	if (nss_context)
+	{
+		NSS_ShutdownContext(nss_context);
+		nss_context = NULL;
+	}
+}
+
+void
+be_tls_destroy(void)
+{
+	/*
+	 * It reads a bit odd to clear a session cache when we are destroying the
+	 * context altogether, but if the session cache isn't cleared before
+	 * shutting down the context it will fail with SEC_ERROR_BUSY.
+	 */
+	SSL_ClearSessionCache();
+}
+
+int
+be_tls_get_cipher_bits(Port *port)
+{
+	SECStatus	status;
+	SSLChannelInfo channel;
+	SSLCipherSuiteInfo suite;
+
+	status = SSL_GetChannelInfo(port->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+		goto error;
+
+	status = SSL_GetCipherSuiteInfo(channel.cipherSuite, &suite, sizeof(suite));
+	if (status != SECSuccess)
+		goto error;
+
+	return suite.effectiveKeyBits;
+
+error:
+	ereport(WARNING,
+			(errmsg("unable to extract TLS session information: %s",
+					pg_SSLerrmessage(PR_GetError()))));
+	return 0;
+}
+
+/*
+ * be_tls_get_compression
+ *
+ * NSS disabled support for TLS compression in version 3.33 and removed the
+ * code in a subsequent release. The API for retrieving information about
+ * compression as well as enabling it is kept for backwards compatibility, but
+ * we don't need to consult it since it was only available for SSLv3 which we
+ * don't support.
+ *
+ * https://bugzilla.mozilla.org/show_bug.cgi?id=1409587
+ */
+bool
+be_tls_get_compression(Port *port)
+{
+	return false;
+}
+
+/*
+ * be_tls_get_version
+ *
+ * Returns the protocol version used for the current connection, or NULL in
+ * case of errors.
+ */
+const char *
+be_tls_get_version(Port *port)
+{
+	SECStatus	status;
+	SSLChannelInfo channel;
+
+	status = SSL_GetChannelInfo(port->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+	{
+		ereport(WARNING,
+				(errmsg("unable to extract TLS session information: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+		return NULL;
+	}
+
+	return ssl_protocol_version_to_string(channel.protocolVersion);
+}
+
+const char *
+be_tls_get_cipher(Port *port)
+{
+	SECStatus	status;
+	SSLChannelInfo channel;
+	SSLCipherSuiteInfo suite;
+
+	status = SSL_GetChannelInfo(port->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+		goto error;
+
+	status = SSL_GetCipherSuiteInfo(channel.cipherSuite, &suite, sizeof(suite));
+	if (status != SECSuccess)
+		goto error;
+
+	return suite.cipherSuiteName;
+
+error:
+	ereport(WARNING,
+			(errmsg("unable to extract TLS session information: %s",
+					pg_SSLerrmessage(PR_GetError()))));
+	return NULL;
+}
+
+void
+be_tls_get_peer_subject_name(Port *port, char *ptr, size_t len)
+{
+	CERTCertificate *certificate;
+
+	certificate = SSL_PeerCertificate(port->pr_fd);
+	if (certificate)
+		strlcpy(ptr, CERT_NameToAscii(&certificate->subject), len);
+	else
+		ptr[0] = '\0';
+}
+
+void
+be_tls_get_peer_issuer_name(Port *port, char *ptr, size_t len)
+{
+	CERTCertificate *certificate;
+
+	certificate = SSL_PeerCertificate(port->pr_fd);
+	if (certificate)
+		strlcpy(ptr, CERT_NameToAscii(&certificate->issuer), len);
+	else
+		ptr[0] = '\0';
+}
+
+void
+be_tls_get_peer_serial(Port *port, char *ptr, size_t len)
+{
+	CERTCertificate *certificate;
+
+	certificate = SSL_PeerCertificate(port->pr_fd);
+	if (certificate)
+		snprintf(ptr, len, "%li", DER_GetInteger(&(certificate->serialNumber)));
+	else
+		ptr[0] = '\0';
+}
+
+char *
+be_tls_get_certificate_hash(Port *port, size_t *len)
+{
+	CERTCertificate *certificate;
+	SECOidTag	signature_tag;
+	SECOidTag	digest_alg;
+	int			digest_len;
+	SECStatus	status;
+	PLArenaPool *arena = NULL;
+	SECItem		digest;
+	char	   *ret;
+
+	*len = 0;
+	certificate = SSL_LocalCertificate(port->pr_fd);
+	if (!certificate)
+		return NULL;
+
+	signature_tag = SECOID_GetAlgorithmTag(&certificate->signature);
+	if (!pg_find_signature_algorithm(signature_tag, &digest_alg, &digest_len))
+		elog(ERROR, "could not find digest for OID '%s'",
+			 SECOID_FindOIDTagDescription(signature_tag));
+
+	arena = PORT_NewArena(SEC_ASN1_DEFAULT_ARENA_SIZE);
+	digest.data = PORT_ArenaZAlloc(arena, sizeof(unsigned char) * digest_len);
+	digest.len = digest_len;
+
+	status = PK11_HashBuf(digest_alg, digest.data,
+						  certificate->derCert.data,
+						  certificate->derCert.len);
+
+	if (status != SECSuccess)
+	{
+		PORT_FreeArena(arena, PR_TRUE);
+		return NULL;
+	}
+
+	ret = palloc(digest.len);
+	memcpy(ret, digest.data, digest.len);
+	*len = digest_len;
+	PORT_FreeArena(arena, PR_TRUE);
+
+	return ret;
+}
+
+/* ------------------------------------------------------------ */
+/*						Internal functions						*/
+/* ------------------------------------------------------------ */
+
+/*
+ * default_nss_tls_init
+ *
+ * The default TLS init hook function which users can override for installing
+ * their own passphrase callbacks and similar actions. In case no callback has
+ * been configured, or the callback isn't reload capable during a server
+ * reload, the dummy callback will be installed.
+ *
+ * The private data for the callback is set differently depending on how it's
+ * invoked. For calls which may invoke the callback deeper in the callstack
+ * the private data is set with SSL_SetPKCS11PinArg. When the call is directly
+ * invoking the callback, like PK11_FindCertFromNickname, then the private
+ * data is passed as a parameter. Setting the data with SSL_SetPKCS11PinArg is
+ * thus not required but good practice.
+ *
+ * NSS doesn't provide a default callback like OpenSSL does, but a callback is
+ * required to be set.  The password callback can be installed at any time, but
+ * setting the private data with SSL_SetPKCS11PinArg requires a PR Filedesc.
+ */
+static void
+default_nss_tls_init(bool isServerStart)
+{
+	/*
+	 * No user-defined callback has been configured, install the dummy call-
+	 * back since we must set something.
+	 */
+	if (!ssl_passphrase_command[0])
+		PK11_SetPasswordFunc(dummy_ssl_passphrase_cb);
+	else
+	{
+		/*
+		 * There is a user-defined callback, set it unless we are in a restart
+		 * and cannot handle restarts due to an interactive callback.
+		 */
+		if (isServerStart)
+			PK11_SetPasswordFunc(external_ssl_passphrase_cb);
+		else
+		{
+			if (ssl_passphrase_command_supports_reload)
+				PK11_SetPasswordFunc(external_ssl_passphrase_cb);
+			else
+				PK11_SetPasswordFunc(dummy_ssl_passphrase_cb);
+		}
+	}
+}
+
+/*
+ * external_ssl_passphrase_cb
+ *
+ * Runs the callback configured by ssl_passphrase_command and returns the
+ * captured password back to NSS.
+ */
+static char *
+external_ssl_passphrase_cb(PK11SlotInfo *slot, PRBool retry, void *arg)
+{
+	/*
+	 * NSS use a hardcoded 256 byte buffer for reading the password so set the
+	 * same limit for our callback buffer.
+	 */
+	char		buf[256];
+	int			len;
+	char	   *password = NULL;
+	char	   *prompt;
+
+	/*
+	 * Since there is no password callback in NSS when the server starts up,
+	 * it makes little sense to create an interactive callback. Thus, if this
+	 * is a retry attempt then give up immediately.
+	 */
+	if (retry)
+		return NULL;
+
+	/*
+	 * Construct the same prompt that NSS uses internally even though it is
+	 * unlikely to serve much purpose, but we must set a prompt so we might as
+	 * well do it right.
+	 */
+	prompt = psprintf("Enter Password or Pin for \"%s\":",
+					  PK11_GetTokenName(slot));
+
+	len = run_ssl_passphrase_command(prompt, ssl_is_server_start, buf, sizeof(buf));
+	pfree(prompt);
+
+	if (!len)
+		return NULL;
+
+	/*
+	 * At least one byte with password content was returned, and NSS requires
+	 * that we return it allocated in NSS controlled memory. If we fail to
+	 * allocate then abort without passing back NULL and bubble up the error
+	 * on the PG side.
+	 */
+	password = (char *) PR_Malloc(len + 1);
+	if (!password)
+	{
+		explicit_bzero(buf, sizeof(buf));
+		ereport(ERROR,
+				(errcode(ERRCODE_OUT_OF_MEMORY),
+				 errmsg("out of memory")));
+	}
+	strlcpy(password, buf, sizeof(password));
+	explicit_bzero(buf, sizeof(buf));
+
+	return password;
+}
+
+/*
+ * dummy_ssl_passphrase_cb
+ *
+ * Return unsuccessful if we are asked to provide the passphrase for a cert or
+ * key, without having a passphrase callback installed.
+ */
+static char *
+dummy_ssl_passphrase_cb(PK11SlotInfo *slot, PRBool retry, void *arg)
+{
+	dummy_ssl_passwd_cb_called = true;
+	return NULL;
+}
+
+static SECStatus
+pg_bad_cert_handler(void *arg, PRFileDesc *fd)
+{
+	Port	   *port = (Port *) arg;
+
+	port->peer_cert_valid = false;
+	return SECFailure;
+}
+
+/*
+ * raw_subject_common_name
+ *
+ * Returns the Subject Common Name for the given certificate as a raw char
+ * buffer (that is, without any form of escaping for unprintable characters or
+ * embedded nulls), with the length of the buffer returned in the len param.
+ * The buffer is allocated in the TopMemoryContext and is given a NULL
+ * terminator so that callers are safe to call strlen() on it.
+ *
+ * This is used instead of CERT_GetCommonName(), which always performs quoting
+ * and/or escaping. NSS doesn't appear to give us a way to easily unescape the
+ * result, and we need to store the raw CN into port->peer_cn for compatibility
+ * with the OpenSSL implementation.
+ */
+static char *
+raw_subject_common_name(CERTCertificate *cert, unsigned int *len)
+{
+	CERTName	subject = cert->subject;
+	CERTRDN	  **rdn;
+
+	for (rdn = subject.rdns; *rdn; rdn++)
+	{
+		CERTAVA	  **ava;
+
+		for (ava = (*rdn)->avas; *ava; ava++)
+		{
+			SECItem	   *buf;
+			char	   *cn;
+
+			if (CERT_GetAVATag(*ava) != SEC_OID_AVA_COMMON_NAME)
+				continue;
+
+			/* Found a CN, ecode and copy it into a newly allocated buffer */
+			buf = CERT_DecodeAVAValue(&(*ava)->value);
+			if (!buf)
+			{
+				/*
+				 * This failure case is difficult to test. (Since this code
+				 * runs after certificate authentication has otherwise
+				 * succeeded, you'd need to convince a CA implementation to
+				 * sign a corrupted certificate in order to get here.)
+				 *
+				 * Follow the behavior of CERT_GetCommonName() in this case and
+				 * simply return NULL, as if a Common Name had not been found.
+				 */
+				goto fail;
+			}
+
+			cn = MemoryContextAlloc(TopMemoryContext, buf->len + 1);
+			memcpy(cn, buf->data, buf->len);
+			cn[buf->len] = '\0';
+
+			*len = buf->len;
+
+			SECITEM_FreeItem(buf, PR_TRUE);
+			return cn;
+		}
+	}
+
+fail:
+	/* Not found. */
+	*len = 0;
+	return NULL;
+}
+
+/*
+ * pg_cert_auth_handler
+ *
+ * Callback for validation of incoming certificates. Returning SECFailure will
+ * cause NSS to terminate the connection immediately.
+ */
+static SECStatus
+pg_cert_auth_handler(void *arg, PRFileDesc *fd, PRBool checksig, PRBool isServer)
+{
+	SECStatus	status;
+	Port	   *port = (Port *) arg;
+	CERTCertificate *cert;
+	char	   *peer_cn;
+	unsigned int len;
+
+	status = SSL_AuthCertificate(CERT_GetDefaultCertDB(), port->pr_fd, checksig, PR_TRUE);
+	if (status != SECSuccess)
+		return status;
+
+	port->peer_cn = NULL;
+	port->peer_cert_valid = false;
+
+	cert = SSL_PeerCertificate(port->pr_fd);
+	if (!cert)
+	{
+		/* Shouldn't be possible; why did we get a client cert callback? */
+		Assert(cert != NULL);
+
+		PR_SetError(SEC_ERROR_LIBRARY_FAILURE, 0);
+		return SECFailure;
+	}
+
+	peer_cn = raw_subject_common_name(cert, &len);
+	if (!peer_cn)
+	{
+		/* No Common Name, but the certificate otherwise checks out. */
+		port->peer_cert_valid = true;
+
+		status = SECSuccess;
+		goto cleanup;
+	}
+
+	/*
+	 * Reject embedded NULLs in certificate common name to prevent attacks like
+	 * CVE-2009-4034.
+	 */
+	if (len != strlen(peer_cn))
+	{
+		ereport(COMMERROR,
+				(errcode(ERRCODE_PROTOCOL_VIOLATION),
+				 errmsg("SSL certificate's common name contains embedded null")));
+
+		pfree(peer_cn);
+		PR_SetError(SEC_ERROR_CERT_NOT_VALID, 0);
+
+		status = SECFailure;
+		goto cleanup;
+	}
+
+	port->peer_cn = peer_cn;
+	port->peer_cert_valid = true;
+
+	status = SECSuccess;
+
+cleanup:
+	CERT_DestroyCertificate(cert);
+	return status;
+}
+
+static PRInt32
+pg_ssl_read(PRFileDesc *fd, void *buf, PRInt32 amount, PRIntn flags,
+			PRIntervalTime timeout)
+{
+	PRRecvFN	read_fn;
+	PRInt32		n_read;
+
+	read_fn = fd->lower->methods->recv;
+	n_read = read_fn(fd->lower, buf, amount, flags, timeout);
+
+	return n_read;
+}
+
+static PRInt32
+pg_ssl_write(PRFileDesc *fd, const void *buf, PRInt32 amount, PRIntn flags,
+			 PRIntervalTime timeout)
+{
+	PRSendFN	send_fn;
+	PRInt32		n_write;
+
+	send_fn = fd->lower->methods->send;
+	n_write = send_fn(fd->lower, buf, amount, flags, timeout);
+
+	return n_write;
+}
+
+static PRStatus
+pg_ssl_close(PRFileDesc *fd)
+{
+	/*
+	 * Disconnect our private Port from the fd before closing out the stack.
+	 * (Debug builds of NSPR will assert if we do not.)
+	 */
+	fd->secret = NULL;
+	return PR_GetDefaultIOMethods()->close(fd);
+}
+
+static PRFileDesc *
+init_iolayer(Port *port)
+{
+	const		PRIOMethods *default_methods;
+	PRFileDesc *layer;
+
+	/*
+	 * Start by initializing our layer with all the default methods so that we
+	 * can selectively override the ones we want while still ensuring that we
+	 * have a complete layer specification.
+	 */
+	default_methods = PR_GetDefaultIOMethods();
+	memcpy(&pr_iomethods, default_methods, sizeof(PRIOMethods));
+
+	pr_iomethods.recv = pg_ssl_read;
+	pr_iomethods.send = pg_ssl_write;
+	pr_iomethods.close = pg_ssl_close;
+
+	/*
+	 * Each IO layer must be identified by a unique name, where uniqueness is
+	 * per connection. Each connection in a postgres cluster can generate the
+	 * identity from the same string as they will create their IO layers on
+	 * different sockets. Only one layer per socket can have the same name.
+	 */
+	pr_id = PR_GetUniqueIdentity("PostgreSQL Server");
+	if (pr_id == PR_INVALID_IO_LAYER)
+	{
+		ereport(ERROR,
+				(errmsg("out of memory when setting up TLS connection")));
+		return NULL;
+	}
+
+	/*
+	 * Create the actual IO layer as a stub such that it can be pushed onto
+	 * the layer stack. The step via a stub is required as we define custom
+	 * callbacks.
+	 */
+	layer = PR_CreateIOLayerStub(pr_id, &pr_iomethods);
+	if (!layer)
+	{
+		ereport(ERROR,
+				(errmsg("unable to create NSS I/O layer")));
+		return NULL;
+	}
+
+	/* Store the Port as private data available in callbacks */
+	layer->secret = (void *) port;
+
+	return layer;
+}
+
+static char *
+ssl_protocol_version_to_string(int v)
+{
+	switch (v)
+	{
+			/* SSL v2 and v3 are not supported */
+		case SSL_LIBRARY_VERSION_2:
+		case SSL_LIBRARY_VERSION_3_0:
+			Assert(false);
+			break;
+
+		case SSL_LIBRARY_VERSION_TLS_1_0:
+			return pstrdup("TLSv1.0");
+		case SSL_LIBRARY_VERSION_TLS_1_1:
+			return pstrdup("TLSv1.1");
+		case SSL_LIBRARY_VERSION_TLS_1_2:
+			return pstrdup("TLSv1.2");
+		case SSL_LIBRARY_VERSION_TLS_1_3:
+			return pstrdup("TLSv1.3");
+	}
+
+	return pstrdup("unknown");
+}
+
+
+/*
+ * ssl_protocol_version_to_nss
+ *			Translate PostgreSQL TLS version to NSS version
+ *
+ * Returns zero in case the requested TLS version is undefined (PG_ANY) and
+ * should be set by the caller, or -1 on failure.
+ */
+static uint16
+ssl_protocol_version_to_nss(int v, const char *guc_name)
+{
+	switch (v)
+	{
+			/*
+			 * There is no SSL_LIBRARY_ macro defined in NSS with the value
+			 * zero, so we use this to signal the caller that the highest
+			 * useful version should be set on the connection.
+			 */
+		case PG_TLS_ANY:
+			return 0;
+
+			/*
+			 * No guard is required here as there are no versions of NSS
+			 * without support for TLS1.
+			 */
+		case PG_TLS1_VERSION:
+			return SSL_LIBRARY_VERSION_TLS_1_0;
+		case PG_TLS1_1_VERSION:
+#ifdef SSL_LIBRARY_VERSION_TLS_1_1
+			return SSL_LIBRARY_VERSION_TLS_1_1;
+#else
+			break;
+#endif
+		case PG_TLS1_2_VERSION:
+#ifdef SSL_LIBRARY_VERSION_TLS_1_2
+			return SSL_LIBRARY_VERSION_TLS_1_2;
+#else
+			break;
+#endif
+		case PG_TLS1_3_VERSION:
+#ifdef SSL_LIBRARY_VERSION_TLS_1_3
+			return SSL_LIBRARY_VERSION_TLS_1_3;
+#else
+			break;
+#endif
+		default:
+			break;
+	}
+
+	return -1;
+}
+
+/*
+ * pg_SSLerrmessage
+ *		Create and return a human readable error message given
+ *		the specified error code
+ *
+ * PR_ErrorToName only converts the enum identifier of the error to string,
+ * but that can be quite useful for debugging (and in case PR_ErrorToString is
+ * unable to render a message then we at least have something).
+ */
+static char *
+pg_SSLerrmessage(PRErrorCode errcode)
+{
+	return psprintf("%s (%s)",
+					PR_ErrorToString(errcode, PR_LANGUAGE_I_DEFAULT),
+					PR_ErrorToName(errcode));
+}
+
+/*
+ * pg_SSLShutdownFunc
+ *		Callback for NSS shutdown
+ *
+ * If NSS is terminated from the outside when the connection is still in use
+ * we must treat this as potentially hostile and immediately close to avoid
+ * leaking the connection in any way. Once this is called, NSS will shutdown
+ * regardless so we may as well clean up the best we can. Returning SECFailure
+ * will cause the NSS shutdown to return with an error, but it will shutdown
+ * nevertheless. nss_data is reserved for future use and is always NULL.
+ */
+static SECStatus
+pg_SSLShutdownFunc(void *private_data, void *nss_data)
+{
+	Port *port = (Port *) private_data;
+
+	if (!port || !port->ssl_in_use)
+		return SECSuccess;
+
+	/*
+	 * There is a connection still open, close it and signal to whatever that
+	 * called the shutdown that it was erroneous.
+	 */
+	be_tls_close(port);
+	be_tls_destroy();
+
+	return SECFailure;
+}
diff --git a/src/backend/libpq/be-secure.c b/src/backend/libpq/be-secure.c
index 4cf139a223..5e0c27c134 100644
--- a/src/backend/libpq/be-secure.c
+++ b/src/backend/libpq/be-secure.c
@@ -49,6 +49,9 @@ bool		ssl_passphrase_command_supports_reload;
 #ifdef USE_SSL
 bool		ssl_loaded_verify_locations = false;
 #endif
+#ifdef USE_NSS
+char	   *ssl_database;
+#endif
 
 /* GUC variable controlling SSL cipher list */
 char	   *SSLCipherSuites = NULL;
diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c
index eafdb1118e..b023b31c46 100644
--- a/src/backend/utils/misc/guc.c
+++ b/src/backend/utils/misc/guc.c
@@ -4308,7 +4308,11 @@ static struct config_string ConfigureNamesString[] =
 		},
 		&ssl_library,
 #ifdef USE_SSL
+#if defined(USE_OPENSSL)
 		"OpenSSL",
+#elif defined(USE_NSS)
+		"NSS",
+#endif
 #else
 		"",
 #endif
@@ -4366,6 +4370,18 @@ static struct config_string ConfigureNamesString[] =
 		check_canonical_path, assign_pgstat_temp_directory, NULL
 	},
 
+#ifdef USE_NSS
+	{
+		{"ssl_database", PGC_SIGHUP, CONN_AUTH_SSL,
+			gettext_noop("Location of the NSS certificate database."),
+			NULL
+		},
+		&ssl_database,
+		"",
+		NULL, NULL, NULL
+	},
+#endif
+
 	{
 		{"synchronous_standby_names", PGC_SIGHUP, REPLICATION_PRIMARY,
 			gettext_noop("Number of synchronous standbys and list of names of potential synchronous ones."),
@@ -4394,8 +4410,10 @@ static struct config_string ConfigureNamesString[] =
 			GUC_SUPERUSER_ONLY
 		},
 		&SSLCipherSuites,
-#ifdef USE_OPENSSL
+#if defined(USE_OPENSSL)
 		"HIGH:MEDIUM:+3DES:!aNULL",
+#elif defined (USE_NSS)
+		"",
 #else
 		"none",
 #endif
diff --git a/src/common/cipher_nss.c b/src/common/cipher_nss.c
new file mode 100644
index 0000000000..9799fef32d
--- /dev/null
+++ b/src/common/cipher_nss.c
@@ -0,0 +1,192 @@
+/*-------------------------------------------------------------------------
+ *
+ * cipher_nss.c
+ *	  NSS functionality shared between frontend and backend for working
+ *	  with ciphers
+ *
+ * This should only bse used if code is compiled with NSS support.
+ *
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ *        src/common/cipher_nss.c
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#ifndef FRONTEND
+#include "postgres.h"
+#else
+#include "postgres_fe.h"
+#endif
+
+#include "common/nss.h"
+
+#define INVALID_CIPHER	0xFFFF
+
+typedef struct
+{
+	SECOidTag	signature;
+	SECOidTag	hash;
+	int			len;
+}			NSSSignatureAlgorithm;
+
+static const NSSSignatureAlgorithm NSS_SCRAMDigestAlgorithm[] = {
+
+	{SEC_OID_PKCS1_MD5_WITH_RSA_ENCRYPTION, SEC_OID_SHA256, SHA256_LENGTH},
+	{SEC_OID_PKCS1_SHA1_WITH_RSA_ENCRYPTION, SEC_OID_SHA256, SHA256_LENGTH},
+	{SEC_OID_ISO_SHA_WITH_RSA_SIGNATURE, SEC_OID_SHA256, SHA256_LENGTH},
+	{SEC_OID_ISO_SHA1_WITH_RSA_SIGNATURE, SEC_OID_SHA256, SHA256_LENGTH},
+	{SEC_OID_PKCS5_PBE_WITH_MD5_AND_DES_CBC, SEC_OID_SHA256, SHA256_LENGTH},
+
+	{SEC_OID_ANSIX962_ECDSA_SHA224_SIGNATURE, SEC_OID_SHA224, SHA224_LENGTH},
+	{SEC_OID_PKCS1_SHA224_WITH_RSA_ENCRYPTION, SEC_OID_SHA224, SHA224_LENGTH},
+	{SEC_OID_NIST_DSA_SIGNATURE_WITH_SHA224_DIGEST, SEC_OID_SHA224, SHA224_LENGTH},
+
+	{SEC_OID_ANSIX962_ECDSA_SHA256_SIGNATURE, SEC_OID_SHA256, SHA256_LENGTH},
+	{SEC_OID_PKCS1_SHA256_WITH_RSA_ENCRYPTION, SEC_OID_SHA256, SHA256_LENGTH},
+	{SEC_OID_NIST_DSA_SIGNATURE_WITH_SHA256_DIGEST, SEC_OID_SHA256, SHA256_LENGTH},
+
+	{SEC_OID_ANSIX962_ECDSA_SHA384_SIGNATURE, SEC_OID_SHA384, SHA384_LENGTH},
+	{SEC_OID_PKCS1_SHA384_WITH_RSA_ENCRYPTION, SEC_OID_SHA384, SHA384_LENGTH},
+
+	{SEC_OID_ANSIX962_ECDSA_SHA512_SIGNATURE, SEC_OID_SHA512, SHA512_LENGTH},
+	{SEC_OID_PKCS1_SHA512_WITH_RSA_ENCRYPTION, SEC_OID_SHA512, SHA512_LENGTH},
+
+	{0, 0}
+};
+
+typedef struct
+{
+	const char *name;
+	PRUint16	number;
+}			NSSCiphers;
+
+/*
+ * This list is a partial copy of the ciphers in NSS files lib/ssl/sslproto.h
+ * in order to provide a human readable version of the ciphers. It would be
+ * nice to not have to have this, but NSS doesn't provide any API addressing
+ * the ciphers by name. TODO: do we want more of the ciphers, or perhaps less?
+ */
+static const NSSCiphers NSS_CipherList[] = {
+
+	{"TLS_NULL_WITH_NULL_NULL", TLS_NULL_WITH_NULL_NULL},
+
+	{"TLS_RSA_WITH_NULL_MD5", TLS_RSA_WITH_NULL_MD5},
+	{"TLS_RSA_WITH_NULL_SHA", TLS_RSA_WITH_NULL_SHA},
+	{"TLS_RSA_WITH_RC4_128_MD5", TLS_RSA_WITH_RC4_128_MD5},
+	{"TLS_RSA_WITH_RC4_128_SHA", TLS_RSA_WITH_RC4_128_SHA},
+	{"TLS_RSA_WITH_IDEA_CBC_SHA", TLS_RSA_WITH_IDEA_CBC_SHA},
+	{"TLS_RSA_WITH_DES_CBC_SHA", TLS_RSA_WITH_DES_CBC_SHA},
+	{"TLS_RSA_WITH_3DES_EDE_CBC_SHA", TLS_RSA_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_DH_DSS_WITH_DES_CBC_SHA", TLS_DH_DSS_WITH_DES_CBC_SHA},
+	{"TLS_DH_DSS_WITH_3DES_EDE_CBC_SHA", TLS_DH_DSS_WITH_3DES_EDE_CBC_SHA},
+	{"TLS_DH_RSA_WITH_DES_CBC_SHA", TLS_DH_RSA_WITH_DES_CBC_SHA},
+	{"TLS_DH_RSA_WITH_3DES_EDE_CBC_SHA", TLS_DH_RSA_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_DHE_DSS_WITH_DES_CBC_SHA", TLS_DHE_DSS_WITH_DES_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_3DES_EDE_CBC_SHA", TLS_DHE_DSS_WITH_3DES_EDE_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_DES_CBC_SHA", TLS_DHE_RSA_WITH_DES_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA", TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_DH_anon_WITH_RC4_128_MD5", TLS_DH_anon_WITH_RC4_128_MD5},
+	{"TLS_DH_anon_WITH_DES_CBC_SHA", TLS_DH_anon_WITH_DES_CBC_SHA},
+	{"TLS_DH_anon_WITH_3DES_EDE_CBC_SHA", TLS_DH_anon_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_RSA_WITH_AES_128_CBC_SHA", TLS_RSA_WITH_AES_128_CBC_SHA},
+	{"TLS_DH_DSS_WITH_AES_128_CBC_SHA", TLS_DH_DSS_WITH_AES_128_CBC_SHA},
+	{"TLS_DH_RSA_WITH_AES_128_CBC_SHA", TLS_DH_RSA_WITH_AES_128_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_AES_128_CBC_SHA", TLS_DHE_DSS_WITH_AES_128_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_AES_128_CBC_SHA", TLS_DHE_RSA_WITH_AES_128_CBC_SHA},
+	{"TLS_DH_anon_WITH_AES_128_CBC_SHA", TLS_DH_anon_WITH_AES_128_CBC_SHA},
+
+	{"TLS_RSA_WITH_AES_256_CBC_SHA", TLS_RSA_WITH_AES_256_CBC_SHA},
+	{"TLS_DH_DSS_WITH_AES_256_CBC_SHA", TLS_DH_DSS_WITH_AES_256_CBC_SHA},
+	{"TLS_DH_RSA_WITH_AES_256_CBC_SHA", TLS_DH_RSA_WITH_AES_256_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_AES_256_CBC_SHA", TLS_DHE_DSS_WITH_AES_256_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_AES_256_CBC_SHA", TLS_DHE_RSA_WITH_AES_256_CBC_SHA},
+	{"TLS_DH_anon_WITH_AES_256_CBC_SHA", TLS_DH_anon_WITH_AES_256_CBC_SHA},
+	{"TLS_RSA_WITH_NULL_SHA256", TLS_RSA_WITH_NULL_SHA256},
+	{"TLS_RSA_WITH_AES_128_CBC_SHA256", TLS_RSA_WITH_AES_128_CBC_SHA256},
+	{"TLS_RSA_WITH_AES_256_CBC_SHA256", TLS_RSA_WITH_AES_256_CBC_SHA256},
+
+	{"TLS_DHE_DSS_WITH_AES_128_CBC_SHA256", TLS_DHE_DSS_WITH_AES_128_CBC_SHA256},
+	{"TLS_RSA_WITH_CAMELLIA_128_CBC_SHA", TLS_RSA_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DH_DSS_WITH_CAMELLIA_128_CBC_SHA", TLS_DH_DSS_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DH_RSA_WITH_CAMELLIA_128_CBC_SHA", TLS_DH_RSA_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_CAMELLIA_128_CBC_SHA", TLS_DHE_DSS_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA", TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DH_anon_WITH_CAMELLIA_128_CBC_SHA", TLS_DH_anon_WITH_CAMELLIA_128_CBC_SHA},
+
+	{"TLS_DHE_DSS_WITH_RC4_128_SHA", TLS_DHE_DSS_WITH_RC4_128_SHA},
+	{"TLS_DHE_RSA_WITH_AES_128_CBC_SHA256", TLS_DHE_RSA_WITH_AES_128_CBC_SHA256},
+	{"TLS_DHE_DSS_WITH_AES_256_CBC_SHA256", TLS_DHE_DSS_WITH_AES_256_CBC_SHA256},
+	{"TLS_DHE_RSA_WITH_AES_256_CBC_SHA256", TLS_DHE_RSA_WITH_AES_256_CBC_SHA256},
+
+	{"TLS_RSA_WITH_CAMELLIA_256_CBC_SHA", TLS_RSA_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DH_DSS_WITH_CAMELLIA_256_CBC_SHA", TLS_DH_DSS_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DH_RSA_WITH_CAMELLIA_256_CBC_SHA", TLS_DH_RSA_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_CAMELLIA_256_CBC_SHA", TLS_DHE_DSS_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA", TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DH_anon_WITH_CAMELLIA_256_CBC_SHA", TLS_DH_anon_WITH_CAMELLIA_256_CBC_SHA},
+
+	{"TLS_RSA_WITH_SEED_CBC_SHA", TLS_RSA_WITH_SEED_CBC_SHA},
+
+	{"TLS_RSA_WITH_AES_128_GCM_SHA256", TLS_RSA_WITH_AES_128_GCM_SHA256},
+	{"TLS_RSA_WITH_AES_256_GCM_SHA384", TLS_RSA_WITH_AES_256_GCM_SHA384},
+	{"TLS_DHE_RSA_WITH_AES_128_GCM_SHA256", TLS_DHE_RSA_WITH_AES_128_GCM_SHA256},
+	{"TLS_DHE_RSA_WITH_AES_256_GCM_SHA384", TLS_DHE_RSA_WITH_AES_256_GCM_SHA384},
+	{"TLS_DHE_DSS_WITH_AES_128_GCM_SHA256", TLS_DHE_DSS_WITH_AES_128_GCM_SHA256},
+	{"TLS_DHE_DSS_WITH_AES_256_GCM_SHA384", TLS_DHE_DSS_WITH_AES_256_GCM_SHA384},
+
+	{"TLS_AES_128_GCM_SHA256", TLS_AES_128_GCM_SHA256},
+	{"TLS_AES_256_GCM_SHA384", TLS_AES_256_GCM_SHA384},
+	{"TLS_CHACHA20_POLY1305_SHA256", TLS_CHACHA20_POLY1305_SHA256},
+	{NULL, 0}
+};
+
+/*
+ * pg_find_cipher
+ *			Translate an NSS ciphername to the cipher code
+ *
+ * Searches the configured ciphers for the corresponding cipher code to the
+ * name. Search is performed case insensitive.
+ */
+bool
+pg_find_cipher(char *name, PRUint16 *cipher)
+{
+	const		NSSCiphers *cipher_list;
+
+	for (cipher_list = NSS_CipherList; cipher_list->name; cipher_list++)
+	{
+		if (pg_strcasecmp(cipher_list->name, name) == 0)
+		{
+			*cipher = cipher_list->number;
+			return true;
+		}
+	}
+
+	return false;
+}
+
+bool
+pg_find_signature_algorithm(SECOidTag signature, SECOidTag *algorithm, int *len)
+{
+	const NSSSignatureAlgorithm *candidate;
+
+	candidate = NSS_SCRAMDigestAlgorithm;
+
+	for (candidate = NSS_SCRAMDigestAlgorithm; candidate->signature; candidate++)
+	{
+		if (signature == candidate->signature)
+		{
+			*algorithm = candidate->hash;
+			*len = candidate->len;
+			return true;
+		}
+	}
+
+	return false;
+}
diff --git a/src/include/common/nss.h b/src/include/common/nss.h
new file mode 100644
index 0000000000..a361dd1f68
--- /dev/null
+++ b/src/include/common/nss.h
@@ -0,0 +1,49 @@
+/*-------------------------------------------------------------------------
+ *
+ * nss.h
+ *	  NSS supporting functionality shared between frontend and backend
+ *
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ *		  src/include/common/nss.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef COMMON_NSS_H
+#define COMMON_NSS_H
+
+#ifdef USE_NSS
+
+/*
+ * BITS_PER_BYTE is also defined in the NSPR header files, so we need to undef
+ * our version to avoid compiler warnings on redefinition.
+ */
+#define pg_BITS_PER_BYTE BITS_PER_BYTE
+#undef BITS_PER_BYTE
+/*
+ * The nspr/obsolete/protypes.h NSPR header typedefs uint64 and int64 with
+ * colliding definitions from ours, causing a much expected compiler error.
+ * Remove backwards compatibility with ancient NSPR versions to avoid this.
+ */
+#define NO_NSPR_10_SUPPORT
+#include <nspr/nspr.h>
+#include <nspr/prerror.h>
+#include <nspr/prio.h>
+#include <nspr/prmem.h>
+#include <nspr/prtypes.h>
+
+
+#include <nss/nss.h>
+#include <nss/hasht.h>
+#include <nss/secoidt.h>
+#include <nss/sslproto.h>
+
+/* src/common/cipher_nss.c */
+bool pg_find_cipher(char *name, PRUint16 *cipher);
+bool pg_find_signature_algorithm(SECOidTag signature, SECOidTag *digest, int *len);
+
+#endif							/* USE_NSS */
+
+#endif							/* COMMON_NSS_H */
diff --git a/src/include/libpq/libpq-be.h b/src/include/libpq/libpq-be.h
index 66a8673d93..bc86fdfcdb 100644
--- a/src/include/libpq/libpq-be.h
+++ b/src/include/libpq/libpq-be.h
@@ -200,6 +200,10 @@ typedef struct Port
 	SSL		   *ssl;
 	X509	   *peer;
 #endif
+
+#ifdef USE_NSS
+	void	   *pr_fd;
+#endif
 } Port;
 
 #ifdef USE_SSL
@@ -283,7 +287,7 @@ extern void be_tls_get_peer_serial(Port *port, char *ptr, size_t len);
  * This is not supported with old versions of OpenSSL that don't have
  * the X509_get_signature_nid() function.
  */
-#if defined(USE_OPENSSL) && defined(HAVE_X509_GET_SIGNATURE_NID)
+#if defined(USE_NSS) || (defined(USE_OPENSSL) && defined(HAVE_X509_GET_SIGNATURE_NID))
 #define HAVE_BE_TLS_GET_CERTIFICATE_HASH
 extern char *be_tls_get_certificate_hash(Port *port, size_t *len);
 #endif
@@ -293,6 +297,10 @@ extern char *be_tls_get_certificate_hash(Port *port, size_t *len);
 typedef void (*openssl_tls_init_hook_typ) (SSL_CTX *context, bool isServerStart);
 extern PGDLLIMPORT openssl_tls_init_hook_typ openssl_tls_init_hook;
 #endif
+#ifdef USE_NSS
+typedef void (*nss_tls_init_hook_type) (bool isServerStart);
+extern PGDLLIMPORT nss_tls_init_hook_type nss_tls_init_hook;
+#endif
 
 #endif							/* USE_SSL */
 
diff --git a/src/include/libpq/libpq.h b/src/include/libpq/libpq.h
index a55898c85a..d2860b852f 100644
--- a/src/include/libpq/libpq.h
+++ b/src/include/libpq/libpq.h
@@ -88,6 +88,9 @@ extern PGDLLIMPORT bool ssl_passphrase_command_supports_reload;
 #ifdef USE_SSL
 extern bool ssl_loaded_verify_locations;
 #endif
+#ifdef USE_NSS
+extern char *ssl_database;
+#endif
 
 extern int	secure_initialize(bool isServerStart);
 extern bool secure_loaded_verify_locations(void);
diff --git a/src/include/pg_config_manual.h b/src/include/pg_config_manual.h
index d27c8601fa..0e50f61b94 100644
--- a/src/include/pg_config_manual.h
+++ b/src/include/pg_config_manual.h
@@ -179,7 +179,7 @@
  * implementation.  (Currently, only OpenSSL is supported, but we might add
  * more implementations in the future.)
  */
-#ifdef USE_OPENSSL
+#if defined(USE_OPENSSL) || defined(USE_NSS)
 #define USE_SSL
 #endif
 
diff --git a/src/interfaces/libpq/fe-connect.c b/src/interfaces/libpq/fe-connect.c
index 8ca0583aa9..1eeeff54a8 100644
--- a/src/interfaces/libpq/fe-connect.c
+++ b/src/interfaces/libpq/fe-connect.c
@@ -355,6 +355,10 @@ static const internalPQconninfoOption PQconninfoOptions[] = {
 		"Target-Session-Attrs", "", 11, /* sizeof("read-write") = 11 */
 	offsetof(struct pg_conn, target_session_attrs)},
 
+	{"cert_database", NULL, NULL, NULL,
+		"CertificateDatabase", "", 64,
+	offsetof(struct pg_conn, cert_database)},
+
 	/* Terminating entry --- MUST BE LAST */
 	{NULL, NULL, NULL, NULL,
 	NULL, NULL, 0}
diff --git a/src/interfaces/libpq/fe-secure-nss.c b/src/interfaces/libpq/fe-secure-nss.c
new file mode 100644
index 0000000000..d2f8dc4902
--- /dev/null
+++ b/src/interfaces/libpq/fe-secure-nss.c
@@ -0,0 +1,1076 @@
+/*-------------------------------------------------------------------------
+ *
+ * fe-secure-nss.c
+ *	  functions for supporting NSS as a TLS backend for frontend libpq
+ *
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ *	  src/interfaces/libpq/fe-secure-nss.c
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#include "postgres_fe.h"
+
+#include "libpq-fe.h"
+#include "fe-auth.h"
+#include "fe-secure-common.h"
+#include "libpq-int.h"
+#include "common/nss.h"
+
+/*
+ * The nspr/obsolete/protypes.h NSPR header typedefs uint64 and int64 with
+ * colliding definitions from ours, causing a much expected compiler error.
+ * Remove backwards compatibility with ancient NSPR versions to avoid this.
+ */
+#define NO_NSPR_10_SUPPORT
+#include <nspr/nspr.h>
+#include <nspr/prerror.h>
+#include <nspr/prinit.h>
+#include <nspr/prio.h>
+
+#include <nss/hasht.h>
+#include <nss/nss.h>
+#include <nss/ssl.h>
+#include <nss/sslproto.h>
+#include <nss/pk11func.h>
+#include <nss/secerr.h>
+#include <nss/secoidt.h>
+#include <nss/secmod.h>
+
+static SECStatus pg_load_nss_module(SECMODModule * *module, const char *library, const char *name);
+static SECStatus pg_bad_cert_handler(void *arg, PRFileDesc * fd);
+static const char *pg_SSLerrmessage(PRErrorCode errcode);
+static SECStatus pg_client_auth_handler(void *arg, PRFileDesc * socket, CERTDistNames * caNames,
+										CERTCertificate * *pRetCert, SECKEYPrivateKey * *pRetKey);
+static SECStatus pg_cert_auth_handler(void *arg, PRFileDesc * fd, PRBool checksig, PRBool isServer);
+static int	ssl_protocol_version_to_nss(const char *protocol);
+static bool cert_database_has_CA(PGconn *conn);
+
+static char *PQssl_passwd_cb(PK11SlotInfo * slot, PRBool retry, void *arg);
+
+/*
+ * PR_ImportTCPSocket() is a private API, but very widely used, as it's the
+ * only way to make NSS use an already set up POSIX file descriptor rather
+ * than opening one itself. To quote the NSS documentation:
+ *
+ *		"In theory, code that uses PR_ImportTCPSocket may break when NSPR's
+ *		implementation changes. In practice, this is unlikely to happen because
+ *		NSPR's implementation has been stable for years and because of NSPR's
+ *		strong commitment to backward compatibility."
+ *
+ * https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSPR/Reference/PR_ImportTCPSocket
+ *
+ * The function is declared in <private/pprio.h>, but as it is a header marked
+ * private we declare it here rather than including it.
+ */
+NSPR_API(PRFileDesc *) PR_ImportTCPSocket(int);
+
+static SECMODModule * ca_trust = NULL;
+
+/*
+ * This logic exist in NSS as well, but it's only available for when there is
+ * a database to open, and not only using the system trust store. Thus, we
+ * need to keep our own copy.
+ */
+#if defined(WIN32)
+static const char *ca_trust_name = "nssckbi.dll";
+#elif defined(__darwin__)
+static const char *ca_trust_name = "libnssckbi.dylib";
+#else
+static const char *ca_trust_name = "libnssckbi.so";
+#endif
+
+static PQsslKeyPassHook_nss_type PQsslKeyPassHook = NULL;
+
+/* ------------------------------------------------------------ */
+/*			 Procedures common to all secure sessions			*/
+/* ------------------------------------------------------------ */
+
+/*
+ * pgtls_init_library
+ *
+ * There is no direct equivalent for PQinitOpenSSL in NSS/NSPR, with PR_Init
+ * being the closest match there is. PR_Init is however already documented to
+ * not be required so simply making this a noop seems like the best option.
+ */
+void
+pgtls_init_library(bool do_ssl, int do_crypto)
+{
+	/* noop */
+}
+
+int
+pgtls_init(PGconn *conn)
+{
+	conn->nss_context = NULL;
+
+	conn->ssl_in_use = false;
+	conn->has_password = false;
+
+	return 0;
+}
+
+void
+pgtls_close(PGconn *conn)
+{
+	if (conn->nss_context)
+	{
+		NSS_ShutdownContext(conn->nss_context);
+		conn->nss_context = NULL;
+	}
+}
+
+PostgresPollingStatusType
+pgtls_open_client(PGconn *conn)
+{
+	SECStatus	status;
+	PRFileDesc *pr_fd;
+	PRFileDesc *model;
+	NSSInitParameters params;
+	SSLVersionRange desired_range;
+
+	/*
+	 * The NSPR documentation states that runtime initialization via PR_Init
+	 * is no longer required, as the first caller into NSPR will perform the
+	 * initialization implicitly. See be-secure-nss.c for further discussion
+	 * on PR_Init.
+	 */
+	PR_Init(PR_USER_THREAD, PR_PRIORITY_NORMAL, 0);
+
+	/*
+	 * NSS initialization and the use of contexts is further discussed in
+	 * be-secure-nss.c
+	 */
+	memset(&params, 0, sizeof(params));
+	params.length = sizeof(params);
+
+	if (conn->cert_database && strlen(conn->cert_database) > 0)
+	{
+		char	   *cert_database_path = psprintf("sql:%s", conn->cert_database);
+
+		conn->nss_context = NSS_InitContext(cert_database_path, "", "", "",
+											&params,
+											NSS_INIT_READONLY | NSS_INIT_PK11RELOAD);
+		pfree(cert_database_path);
+
+		if (!conn->nss_context)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("unable to open certificate database \"%s\": %s"),
+							  conn->cert_database,
+							  pg_SSLerrmessage(PR_GetError()));
+			return PGRES_POLLING_FAILED;
+		}
+	}
+	else
+	{
+		conn->nss_context = NSS_InitContext("", "", "", "", &params,
+											NSS_INIT_READONLY | NSS_INIT_NOCERTDB |
+											NSS_INIT_NOMODDB | NSS_INIT_FORCEOPEN |
+											NSS_INIT_NOROOTINIT | NSS_INIT_PK11RELOAD);
+		if (!conn->nss_context)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("unable to create certificate database: %s"),
+							  pg_SSLerrmessage(PR_GetError()));
+			return PGRES_POLLING_FAILED;
+		}
+	}
+
+	/*
+	 * Configure cipher policy.
+	 */
+	status = NSS_SetDomesticPolicy();
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to configure cipher policy: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * If we don't have a certificate database, the system trust store is the
+	 * fallback we can use. If we fail to initialize that as well, we can
+	 * still attempt a connection as long as the sslmode isn't verify*.
+	 */
+	if (!conn->cert_database && conn->sslmode[0] == 'v')
+	{
+		status = pg_load_nss_module(&ca_trust, ca_trust_name, "\"Root Certificates\"");
+		if (status != SECSuccess)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("WARNING: unable to load NSS trust module \"%s\" : %s"),
+							  ca_trust_name,
+							  pg_SSLerrmessage(PR_GetError()));
+
+			return PGRES_POLLING_FAILED;
+		}
+	}
+
+
+	PK11_SetPasswordFunc(PQssl_passwd_cb);
+
+	/*
+	 * Import the already opened socket as we don't want to use NSPR functions
+	 * for opening the network socket due to how the PostgreSQL protocol works
+	 * with TLS connections. This function is not part of the NSPR public API,
+	 * see the comment at the top of the file for the rationale of still using
+	 * it.
+	 */
+	pr_fd = PR_ImportTCPSocket(conn->sock);
+	if (!pr_fd)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to attach to socket: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * Most of the documentation available, and implementations of, NSS/NSPR
+	 * use the PR_NewTCPSocket() function here, which has the drawback that it
+	 * can only create IPv4 sockets. Instead use PR_OpenTCPSocket() which
+	 * copes with IPv6 as well.
+	 */
+	model = SSL_ImportFD(NULL, PR_OpenTCPSocket(conn->laddr.addr.ss_family));
+	if (!model)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to enable TLS: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/* Disable old protocol versions (SSLv2 and SSLv3) */
+	SSL_OptionSet(model, SSL_ENABLE_SSL2, PR_FALSE);
+	SSL_OptionSet(model, SSL_V2_COMPATIBLE_HELLO, PR_FALSE);
+	SSL_OptionSet(model, SSL_ENABLE_SSL3, PR_FALSE);
+
+#ifdef SSL_CBC_RANDOM_IV
+
+	/*
+	 * Enable protection against the BEAST attack in case the NSS library has
+	 * support for that. While SSLv3 is disabled, we may still allow TLSv1
+	 * which is affected. The option isn't documented as an SSL option, but as
+	 * an NSS environment variable.
+	 */
+	SSL_OptionSet(model, SSL_CBC_RANDOM_IV, PR_TRUE);
+#endif
+
+	/* Set us up as a TLS client for the handshake */
+	SSL_OptionSet(model, SSL_HANDSHAKE_AS_CLIENT, PR_TRUE);
+
+	/*
+	 * When setting the available protocols, we either use the user defined
+	 * configuration values, and if missing we accept whatever is the highest
+	 * version supported by the library as the max and only limit the range in
+	 * the other end at TLSv1.0. ssl_variant_stream is a ProtocolVariant enum
+	 * for Stream protocols, rather than datagram.
+	 */
+	SSL_VersionRangeGetSupported(ssl_variant_stream, &desired_range);
+	desired_range.min = SSL_LIBRARY_VERSION_TLS_1_0;
+
+	if (conn->ssl_min_protocol_version && strlen(conn->ssl_min_protocol_version) > 0)
+	{
+		int			ssl_min_ver = ssl_protocol_version_to_nss(conn->ssl_min_protocol_version);
+
+		if (ssl_min_ver == -1)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("invalid value \"%s\" for minimum version of SSL protocol\n"),
+							  conn->ssl_min_protocol_version);
+			return -1;
+		}
+
+		desired_range.min = ssl_min_ver;
+	}
+
+	if (conn->ssl_max_protocol_version && strlen(conn->ssl_max_protocol_version) > 0)
+	{
+		int			ssl_max_ver = ssl_protocol_version_to_nss(conn->ssl_max_protocol_version);
+
+		if (ssl_max_ver == -1)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("invalid value \"%s\" for maximum version of SSL protocol\n"),
+							  conn->ssl_max_protocol_version);
+			return -1;
+		}
+
+		desired_range.max = ssl_max_ver;
+	}
+
+	if (SSL_VersionRangeSet(model, &desired_range) != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to set allowed SSL protocol version range: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * Set up callback for verifying server certificates, as well as for how
+	 * to handle failed verifications.
+	 */
+	SSL_AuthCertificateHook(model, pg_cert_auth_handler, (void *) conn);
+	SSL_BadCertHook(model, pg_bad_cert_handler, (void *) conn);
+
+	/*
+	 * Convert the NSPR socket to an SSL socket. Ensuring the success of this
+	 * operation is critical as NSS SSL_* functions may return SECSuccess on
+	 * the socket even though SSL hasn't been enabled, which introduce a risk
+	 * of silent downgrades.
+	 */
+	conn->pr_fd = SSL_ImportFD(model, pr_fd);
+	if (!conn->pr_fd)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to configure client for TLS: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * The model can now we closed as we've applied the settings of the model
+	 * onto the real socket. From hereon we should only use conn->pr_fd.
+	 */
+	PR_Close(model);
+
+	/* Set the private data to be passed to the password callback */
+	SSL_SetPKCS11PinArg(conn->pr_fd, (void *) conn);
+
+	/*
+	 * If a CRL file has been specified, verify if it exists in the database
+	 * but don't fail in case it doesn't.
+	 */
+	if (conn->sslcrl && strlen(conn->sslcrl) > 0)
+	{
+		/* XXX: Implement me.. */
+	}
+
+	status = SSL_ResetHandshake(conn->pr_fd, PR_FALSE);
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to initiate handshake: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/* Set callback for client authentication when requested by the server */
+	SSL_GetClientAuthDataHook(conn->pr_fd, pg_client_auth_handler, (void *) conn);
+
+	/*
+	 * Specify which hostname we are expecting to talk to. This is required,
+	 * albeit mostly applies to when opening a connection to a traditional
+	 * http server it seems.
+	 */
+	SSL_SetURL(conn->pr_fd, (conn->connhost[conn->whichhost]).host);
+
+	do
+	{
+		status = SSL_ForceHandshake(conn->pr_fd);
+	}
+	while (status != SECSuccess && PR_GetError() == PR_WOULD_BLOCK_ERROR);
+
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("SSL error: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	conn->ssl_in_use = true;
+	return PGRES_POLLING_OK;
+}
+
+ssize_t
+pgtls_read(PGconn *conn, void *ptr, size_t len)
+{
+	PRInt32		nread;
+	PRErrorCode status;
+	int			read_errno = 0;
+
+	/*
+	 * PR_Recv blocks until there is data to read or the timeout expires. We
+	 * don't want to sit blocked here, so the timeout is turned off by using
+	 * PR_INTERVAL_NO_WAIT which means "return immediately",  Zero is returned
+	 * for closed connections, while -1 indicates an error within the ongoing
+	 * connection.
+	 */
+	nread = PR_Recv(conn->pr_fd, ptr, len, 0, PR_INTERVAL_NO_WAIT);
+
+	if (nread == 0)
+	{
+		read_errno = ECONNRESET;
+		nread = -1;
+	}
+	else if (nread == -1)
+	{
+		status = PR_GetError();
+
+		switch (status)
+		{
+			case PR_IO_TIMEOUT_ERROR:
+				/* No data available yet. */
+				nread = 0;
+				break;
+
+			case PR_WOULD_BLOCK_ERROR:
+				read_errno = EWOULDBLOCK;
+				break;
+
+				/*
+				 * The error cases for PR_Recv are not documented, but can be
+				 * reverse engineered from _MD_unix_map_default_error() in the
+				 * NSPR code, defined in pr/src/md/unix/unix_errors.c.
+				 */
+			case PR_NETWORK_UNREACHABLE_ERROR:
+			case PR_CONNECT_RESET_ERROR:
+				read_errno = ECONNRESET;
+				break;
+
+			default:
+				break;
+		}
+
+		if (nread == -1)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("TLS read error: %s"),
+							  pg_SSLerrmessage(status));
+		}
+	}
+
+	SOCK_ERRNO_SET(read_errno);
+	return (ssize_t) nread;
+}
+
+/*
+ * pgtls_read_pending
+ *		Check for the existence of data to be read.
+ *
+ * This is part of the PostgreSQL TLS backend API.
+ */
+bool
+pgtls_read_pending(PGconn *conn)
+{
+	unsigned char c;
+	int			n;
+
+	/*
+	 * PR_Recv peeks into the stream with the timeount turned off, to see if
+	 * there is another byte to read off the wire. There is an NSS function
+	 * SSL_DataPending() which might seem like a better fit, but it will only
+	 * check already encrypted data in the SSL buffer, not still unencrypted
+	 * data, thus it doesn't guarantee that a subsequent call to
+	 * PR_Read/PR_Recv won't block.
+	 */
+	n = PR_Recv(conn->pr_fd, &c, 1, PR_MSG_PEEK, PR_INTERVAL_NO_WAIT);
+	return (n > 0);
+}
+
+ssize_t
+pgtls_write(PGconn *conn, const void *ptr, size_t len)
+{
+	PRInt32		n;
+	PRErrorCode status;
+	int			write_errno = 0;
+
+	n = PR_Write(conn->pr_fd, ptr, len);
+
+	if (n < 0)
+	{
+		status = PR_GetError();
+
+		switch (status)
+		{
+			case PR_WOULD_BLOCK_ERROR:
+#ifdef EAGAIN
+				write_errno = EAGAIN;
+#else
+				write_errno = EINTR;
+#endif
+				break;
+
+			default:
+				printfPQExpBuffer(&conn->errorMessage,
+								  libpq_gettext("TLS write error: %s"),
+								  pg_SSLerrmessage(status));
+				write_errno = ECONNRESET;
+				break;
+		}
+	}
+
+	SOCK_ERRNO_SET(write_errno);
+	return (ssize_t) n;
+}
+
+char *
+pgtls_get_peer_certificate_hash(PGconn *conn, size_t *len)
+{
+	CERTCertificate *server_cert;
+	SECOidTag	signature_tag;
+	SECOidTag	digest_alg;
+	int			digest_len;
+	PLArenaPool *arena;
+	SECItem		digest;
+	char	   *ret;
+	SECStatus	status;
+
+	*len = 0;
+
+	server_cert = SSL_PeerCertificate(conn->pr_fd);
+	if (!server_cert)
+		return NULL;
+
+	signature_tag = SECOID_GetAlgorithmTag(&server_cert->signature);
+	if (!pg_find_signature_algorithm(signature_tag, &digest_alg, &digest_len))
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("could not find digest for OID '%s'\n"),
+						  SECOID_FindOIDTagDescription(signature_tag));
+		return NULL;
+	}
+
+	arena = PORT_NewArena(SEC_ASN1_DEFAULT_ARENA_SIZE);
+	digest.data = PORT_ArenaZAlloc(arena, sizeof(unsigned char) * digest_len);
+	digest.len = digest_len;
+
+	status = PK11_HashBuf(digest_alg, digest.data, server_cert->derCert.data,
+						  server_cert->derCert.len);
+
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to generate peer certificate digest: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		PORT_FreeArena(arena, PR_TRUE);
+		return NULL;
+	}
+
+	ret = pg_malloc(digest.len);
+	memcpy(ret, digest.data, digest.len);
+	*len = digest_len;
+	PORT_FreeArena(arena, PR_TRUE);
+
+	return ret;
+}
+
+/*
+ *	Verify that the server certificate matches the hostname we connected to.
+ *
+ * The certificate's Common Name and Subject Alternative Names are considered.
+ */
+int
+pgtls_verify_peer_name_matches_certificate_guts(PGconn *conn,
+												int *names_examined,
+												char **first_name)
+{
+	char	   *server_hostname = NULL;
+	CERTCertificate *server_cert = NULL;
+	SECStatus	status = SECSuccess;
+	SECItem		altname_item;
+	PLArenaPool *arena = NULL;
+	CERTGeneralName *san_list;
+	CERTGeneralName *cn;
+
+	server_hostname = SSL_RevealURL(conn->pr_fd);
+	if (!server_hostname || server_hostname[0] == '\0')
+		goto done;
+
+	/*
+	 * CERT_VerifyCertName will internally perform RFC 2818 SubjectAltName
+	 * verification.
+	 */
+	server_cert = SSL_PeerCertificate(conn->pr_fd);
+	status = CERT_VerifyCertName(server_cert, server_hostname);
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to verify server hostname: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		goto done;
+	}
+
+	status = CERT_FindCertExtension(server_cert, SEC_OID_X509_SUBJECT_ALT_NAME,
+									&altname_item);
+	if (status == SECSuccess)
+	{
+		arena = PORT_NewArena(DER_DEFAULT_CHUNKSIZE);
+		if (!arena)
+		{
+			status = SECFailure;
+			goto done;
+		}
+		san_list = CERT_DecodeAltNameExtension(arena, &altname_item);
+		if (!san_list)
+		{
+			status = SECFailure;
+			goto done;
+		}
+
+		for (cn = san_list; cn != san_list; cn = CERT_GetNextGeneralName(cn))
+		{
+			char	   *alt_name;
+			int			rv;
+			char		tmp[512];
+
+			status = CERT_RFC1485_EscapeAndQuote(tmp, sizeof(tmp),
+												 (char *) cn->name.other.data,
+												 cn->name.other.len);
+
+			if (status != SECSuccess)
+				goto done;
+
+			rv = pq_verify_peer_name_matches_certificate_name(conn, tmp,
+															  strlen(tmp),
+															  &alt_name);
+			if (alt_name)
+			{
+				if (!*first_name)
+					*first_name = alt_name;
+				else
+					free(alt_name);
+			}
+
+			if (rv == 1)
+				status = SECSuccess;
+			else
+			{
+				status = SECFailure;
+				break;
+			}
+		}
+	}
+	else if (PORT_GetError() == SEC_ERROR_EXTENSION_NOT_FOUND)
+		status = SECSuccess;
+	else
+		status = SECSuccess;
+
+done:
+	/* san_list will be freed by freeing the arena it was allocated in */
+	if (arena)
+		PORT_FreeArena(arena, PR_TRUE);
+	PR_Free(server_hostname);
+
+	if (status == SECSuccess)
+		return 1;
+
+	return 0;
+}
+
+/* ------------------------------------------------------------ */
+/*			PostgreSQL specific TLS support functions			*/
+/* ------------------------------------------------------------ */
+
+static const char *
+pg_SSLerrmessage(PRErrorCode errcode)
+{
+	const char *error;
+
+	/*
+	 * Try to get the user friendly error description, and if that fails try
+	 * to fall back on the name of the PRErrorCode.
+	 */
+	error = PR_ErrorToString(errcode, PR_LANGUAGE_I_DEFAULT);
+	if (!error)
+		error = PR_ErrorToName(errcode);
+	if (error)
+		return error;
+
+	return "unknown TLS error";
+}
+
+static SECStatus
+pg_load_nss_module(SECMODModule * *module, const char *library, const char *name)
+{
+	SECMODModule *mod;
+	char	   *modulespec;
+
+	modulespec = psprintf("library=\"%s\", name=\"%s\"", library, name);
+
+	/*
+	 * Attempt to load the specified module. The second parameter is "parent"
+	 * which should always be NULL for application code. The third parameter
+	 * defines if loading should recurse which is only applicable when loading
+	 * a module from within another module. This hierarchy would have to be
+	 * defined in the modulespec, and since we don't support anything but
+	 * directly addressed modules we should pass PR_FALSE.
+	 */
+	mod = SECMOD_LoadUserModule(modulespec, NULL, PR_FALSE);
+	pfree(modulespec);
+
+	if (mod && mod->loaded)
+	{
+		*module = mod;
+		return SECSuccess;
+	}
+
+	SECMOD_DestroyModule(mod);
+	return SECFailure;
+}
+
+/* ------------------------------------------------------------ */
+/*						NSS Callbacks							*/
+/* ------------------------------------------------------------ */
+
+/*
+ * pg_cert_auth_handler
+ *			Callback for authenticating server certificate
+ *
+ * This is pretty much the same procedure as the SSL_AuthCertificate function
+ * provided by NSS, with the difference being server hostname validation. With
+ * SSL_AuthCertificate there is no way to do verify-ca, it only does the -full
+ * flavor of our sslmodes, so we need our own implementation.
+ */
+static SECStatus
+pg_cert_auth_handler(void *arg, PRFileDesc *fd, PRBool checksig, PRBool isServer)
+{
+	SECStatus	status;
+	PGconn	   *conn = (PGconn *) arg;
+	CERTCertificate *server_cert;
+	void	   *pin;
+
+	Assert(!isServer);
+
+	pin = SSL_RevealPinArg(conn->pr_fd);
+	server_cert = SSL_PeerCertificate(conn->pr_fd);
+
+	status = CERT_VerifyCertificateNow((CERTCertDBHandle *) CERT_GetDefaultCertDB(),
+									   server_cert,
+									   checksig,
+									   certificateUsageSSLServer,
+									   pin,
+									   NULL);
+
+	/*
+	 * If we've already failed validation then there is no point in also
+	 * performing the hostname check for verify-full.
+	 */
+	if (status == SECSuccess)
+	{
+		if (!pq_verify_peer_name_matches_certificate(conn))
+			status = SECFailure;
+	}
+	else
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to verify certificate: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+	}
+
+	return status;
+}
+
+/*
+ * pg_client_auth_handler
+ *		Callback for client certificate validation
+ *
+ * The client auth callback is not on by default in NSS, so we need to invoke
+ * it ourselves to ensure we can do cert authentication. A TODO is to support
+ * running without a specified sslcert parameter. By retrieving all the certs
+ * via nickname from the cert database and see if we find one which apply with
+ * NSS_CmpCertChainWCANames() and PK11_FindKeyByAnyCert() we could support
+ * just running with a ssl database specified.
+ *
+ * For now, we use the default client certificate validation which requires a
+ * defined nickname to identify the cert in the database.
+ */
+static SECStatus
+pg_client_auth_handler(void *arg, PRFileDesc * socket, CERTDistNames * caNames,
+					   CERTCertificate * *pRetCert, SECKEYPrivateKey * *pRetKey)
+{
+	PGconn	   *conn = (PGconn *) arg;
+
+	return NSS_GetClientAuthData(conn->sslcert, socket, caNames, pRetCert, pRetKey);
+}
+
+/*
+ * pg_bad_cert_handler
+ *		Callback for failed certificate validation
+ *
+ * The TLS handshake will call this function iff the server certificate failed
+ * validation. Depending on the sslmode, we allow the connection anyways.
+ */
+static SECStatus
+pg_bad_cert_handler(void *arg, PRFileDesc * fd)
+{
+	PGconn	   *conn = (PGconn *) arg;
+	PRErrorCode err;
+
+	/*
+	 * This really shouldn't happen, as we've set the PGconn object as our
+	 * callback data, and at the callsite we know it will be populated. That
+	 * being said, the NSS code itself performs this check even when it should
+	 * not be required so let's use the same belts with our suspenders.
+	 */
+	if (!arg)
+		return SECFailure;
+
+	/*
+	 * For sslmodes other than verify-full and verify-ca we don't perform peer
+	 * validation, so return immediately.  sslmode require with a database
+	 * specified which contains a CA certificate will work like verify-ca to
+	 * be compatible with the OpenSSL implementation.
+	 */
+	if (strcmp(conn->sslmode, "require") == 0)
+	{
+		if (conn->cert_database && strlen(conn->cert_database) > 0 && cert_database_has_CA(conn))
+			return SECFailure;
+	}
+	if (conn->sslmode[0] == 'v')
+		return SECFailure;
+
+	err = PORT_GetError();
+
+	/*
+	 * TODO: these are relevant error codes that can occur in certificate
+	 * validation, figure out which we don't want for require/prefer etc.
+	 */
+	switch (err)
+	{
+		case SEC_ERROR_INVALID_AVA:
+		case SEC_ERROR_INVALID_TIME:
+		case SEC_ERROR_BAD_SIGNATURE:
+		case SEC_ERROR_EXPIRED_CERTIFICATE:
+		case SEC_ERROR_UNKNOWN_ISSUER:
+		case SEC_ERROR_UNTRUSTED_ISSUER:
+		case SEC_ERROR_UNTRUSTED_CERT:
+		case SEC_ERROR_CERT_VALID:
+		case SEC_ERROR_EXPIRED_ISSUER_CERTIFICATE:
+		case SEC_ERROR_CRL_EXPIRED:
+		case SEC_ERROR_CRL_BAD_SIGNATURE:
+		case SEC_ERROR_EXTENSION_VALUE_INVALID:
+		case SEC_ERROR_CA_CERT_INVALID:
+		case SEC_ERROR_CERT_USAGES_INVALID:
+		case SEC_ERROR_UNKNOWN_CRITICAL_EXTENSION:
+			return SECSuccess;
+			break;
+		default:
+			return SECFailure;
+			break;
+	}
+
+	/* Unreachable */
+	return SECSuccess;
+}
+
+/* ------------------------------------------------------------ */
+/*					SSL information functions					*/
+/* ------------------------------------------------------------ */
+
+/*
+ * PQgetssl
+ *
+ * Return NULL as this is legacy and defined to always be equal to calling
+ * PQsslStruct(conn, "OpenSSL"); This should ideally trigger a logged warning
+ * somewhere as it's nonsensical to run in a non-OpenSSL build, but the color
+ * of said bikeshed hasn't yet been determined.
+ */
+void *
+PQgetssl(PGconn *conn)
+{
+	return NULL;
+}
+
+void *
+PQsslStruct(PGconn *conn, const char *struct_name)
+{
+	if (!conn)
+		return NULL;
+
+	/*
+	 * Return the underlying PRFileDesc which can be used to access
+	 * information on the connection details. There is no SSL context per se.
+	 */
+	if (strcmp(struct_name, "NSS") == 0)
+		return conn->pr_fd;
+	return NULL;
+}
+
+const char *const *
+PQsslAttributeNames(PGconn *conn)
+{
+	static const char *const result[] = {
+		"library",
+		"cipher",
+		"protocol",
+		"key_bits",
+		"compression",
+		NULL
+	};
+
+	return result;
+}
+
+const char *
+PQsslAttribute(PGconn *conn, const char *attribute_name)
+{
+	SECStatus	status;
+	SSLChannelInfo channel;
+	SSLCipherSuiteInfo suite;
+
+	if (!conn || !conn->pr_fd)
+		return NULL;
+
+	if (strcmp(attribute_name, "library") == 0)
+		return "NSS";
+
+	status = SSL_GetChannelInfo(conn->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+		return NULL;
+
+	status = SSL_GetCipherSuiteInfo(channel.cipherSuite, &suite, sizeof(suite));
+	if (status != SECSuccess)
+		return NULL;
+
+	if (strcmp(attribute_name, "cipher") == 0)
+		return suite.cipherSuiteName;
+
+	if (strcmp(attribute_name, "key_bits") == 0)
+	{
+		static char key_bits_str[8];
+
+		snprintf(key_bits_str, sizeof(key_bits_str), "%i", suite.effectiveKeyBits);
+		return key_bits_str;
+	}
+
+	if (strcmp(attribute_name, "protocol") == 0)
+	{
+		switch (channel.protocolVersion)
+		{
+#ifdef SSL_LIBRARY_VERSION_TLS_1_3
+			case SSL_LIBRARY_VERSION_TLS_1_3:
+				return "TLSv1.3";
+#endif
+#ifdef SSL_LIBRARY_VERSION_TLS_1_2
+			case SSL_LIBRARY_VERSION_TLS_1_2:
+				return "TLSv1.2";
+#endif
+#ifdef SSL_LIBRARY_VERSION_TLS_1_1
+			case SSL_LIBRARY_VERSION_TLS_1_1:
+				return "TLSv1.1";
+#endif
+			case SSL_LIBRARY_VERSION_TLS_1_0:
+				return "TLSv1.0";
+			default:
+				return "unknown";
+		}
+	}
+
+	/*
+	 * NSS disabled support for compression in version 3.33, and it was only
+	 * available for SSLv3 at that point anyways, so we can safely return off
+	 * here without checking.
+	 */
+	if (strcmp(attribute_name, "compression") == 0)
+		return "off";
+
+	return NULL;
+}
+
+static int
+ssl_protocol_version_to_nss(const char *protocol)
+{
+	if (pg_strcasecmp("TLSv1", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_0;
+
+#ifdef SSL_LIBRARY_VERSION_TLS_1_1
+	if (pg_strcasecmp("TLSv1.1", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_1;
+#endif
+
+#ifdef SSL_LIBRARY_VERSION_TLS_1_2
+	if (pg_strcasecmp("TLSv1.2", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_2;
+#endif
+
+#ifdef SSL_LIBRARY_VERSION_TLS_1_3
+	if (pg_strcasecmp("TLSv1.3", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_3;
+#endif
+
+	return -1;
+}
+
+/*
+ * cert_database_has_CA
+ *
+ * Returns true in case there is a CA certificate in the database connected
+ * to in the conn object, else false. This function only checks for the
+ * presence of a CA certificate, not it's validity and/or usefulness.
+ */
+static bool
+cert_database_has_CA(PGconn *conn)
+{
+	CERTCertList *certificates;
+	bool		hasCA;
+
+	/*
+	 * If the certificate database has a password we must provide it, since
+	 * this API doesn't invoke the standard password callback.
+	 */
+	if (conn->has_password)
+		certificates = PK11_ListCerts(PK11CertListCA, PQssl_passwd_cb(NULL, PR_FALSE, (void *) conn));
+	else
+		certificates = PK11_ListCerts(PK11CertListCA, NULL);
+	hasCA = !CERT_LIST_EMPTY(certificates);
+	CERT_DestroyCertList(certificates);
+
+	return hasCA;
+}
+
+PQsslKeyPassHook_nss_type
+PQgetSSLKeyPassHook_nss(void)
+{
+	return PQsslKeyPassHook;
+}
+
+void
+PQsetSSLKeyPassHook_nss(PQsslKeyPassHook_nss_type hook)
+{
+	PQsslKeyPassHook = hook;
+}
+
+/*
+ * Supply a password to decrypt a client certificate.
+ *
+ * This must match NSS type PK11PasswordFunc.
+ */
+static char *
+PQssl_passwd_cb(PK11SlotInfo *slot, PRBool retry, void *arg)
+{
+	PGconn	   *conn = (PGconn *) arg;
+
+	conn->has_password = true;
+
+	if (PQsslKeyPassHook)
+		return PQsslKeyPassHook(slot, (PRBool) retry, arg);
+	else
+		return PQdefaultSSLKeyPassHook_nss(slot, retry, arg);
+}
+
+/*
+ * The default password handler callback.
+ */
+char *
+PQdefaultSSLKeyPassHook_nss(PK11SlotInfo * slot, PRBool retry, void *arg)
+{
+	PGconn	   *conn = (PGconn *) arg;
+
+	/*
+	 * If the password didn't work the first time there is no point in
+	 * retrying as it hasn't changed.
+	 */
+	if (retry != PR_TRUE && conn->sslpassword && strlen(conn->sslpassword) > 0)
+		return PORT_Strdup(conn->sslpassword);
+
+	return NULL;
+}
diff --git a/src/interfaces/libpq/fe-secure.c b/src/interfaces/libpq/fe-secure.c
index 00b87bdc96..83ebd05ce5 100644
--- a/src/interfaces/libpq/fe-secure.c
+++ b/src/interfaces/libpq/fe-secure.c
@@ -441,6 +441,27 @@ PQdefaultSSLKeyPassHook_OpenSSL(char *buf, int size, PGconn *conn)
 }
 #endif							/* USE_SSL */
 
+#ifndef USE_NSS
+
+PQsslKeyPassHook_nss_type
+PQgetSSLKeyPassHook_nss(void)
+{
+	return NULL;
+}
+
+void
+PQsetSSLKeyPassHook_nss(PQsslKeyPassHook_nss_type hook)
+{
+	return;
+}
+
+char *
+PQdefaultSSLKeyPassHook_nss(PK11SlotInfo * slot, PRBool retry, void *arg)
+{
+	return NULL;
+}
+#endif							/* USE_NSS */
+
 /* Dummy version of GSSAPI information functions, when built without GSS support */
 #ifndef ENABLE_GSS
 
diff --git a/src/interfaces/libpq/libpq-fe.h b/src/interfaces/libpq/libpq-fe.h
index c266ad5b13..59ce0815cf 100644
--- a/src/interfaces/libpq/libpq-fe.h
+++ b/src/interfaces/libpq/libpq-fe.h
@@ -625,6 +625,17 @@ extern PQsslKeyPassHook_OpenSSL_type PQgetSSLKeyPassHook_OpenSSL(void);
 extern void PQsetSSLKeyPassHook_OpenSSL(PQsslKeyPassHook_OpenSSL_type hook);
 extern int	PQdefaultSSLKeyPassHook_OpenSSL(char *buf, int size, PGconn *conn);
 
+/* == in fe-secure-nss.c === */
+typedef struct PK11SlotInfoStr PK11SlotInfo;
+typedef int PRIntn;
+typedef PRIntn PRBool;
+
+/* Support for overriding sslpassword handling with a callback */
+typedef char *(*PQsslKeyPassHook_nss_type) (PK11SlotInfo *slot, PRBool retry, void *arg);
+extern PQsslKeyPassHook_nss_type PQgetSSLKeyPassHook_nss(void);
+extern void PQsetSSLKeyPassHook_nss(PQsslKeyPassHook_nss_type hook);
+extern char *PQdefaultSSLKeyPassHook_nss(PK11SlotInfo *slot, PRBool retry, void *arg);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/src/interfaces/libpq/libpq-int.h b/src/interfaces/libpq/libpq-int.h
index 4db498369c..c6f84096a0 100644
--- a/src/interfaces/libpq/libpq-int.h
+++ b/src/interfaces/libpq/libpq-int.h
@@ -362,6 +362,7 @@ struct pg_conn
 	char	   *sslpassword;	/* client key file password */
 	char	   *sslrootcert;	/* root certificate filename */
 	char	   *sslcrl;			/* certificate revocation list filename */
+	char	   *cert_database;	/* NSS certificate/key database */
 	char	   *requirepeer;	/* required peer credentials for local sockets */
 	char	   *gssencmode;		/* GSS mode (require,prefer,disable) */
 	char	   *krbsrvname;		/* Kerberos service name */
@@ -485,6 +486,28 @@ struct pg_conn
 								 * OpenSSL version changes */
 #endif
 #endif							/* USE_OPENSSL */
+
+/*
+ * The NSS/NSPR specific types aren't used to avoid pulling in the required
+ * headers here, as they are causing conflicts with PG definitions.
+ */
+#ifdef USE_NSS
+	void	   *nss_context;	/* NSS connection specific context */
+	void	   *pr_fd;			/* NSPR file descriptor for the connection */
+
+	/*
+	 * Track whether the NSS database has a password set or not. There is no
+	 * API function for retrieving password status of a database, but we need
+	 * to know since some NSS API calls require the password passed in (they
+	 * don't call the callback themselves). To track, we simply flip this to
+	 * true in case NSS invoked the password callback - as that will only
+	 * happen in case there is a password. The reason for tracking this is
+	 * that there are calls which require a password parameter, but doesn't
+	 * use the callbacks provided, so we must call the callback on behalf of
+	 * these.
+	 */
+	bool		has_password;
+#endif							/* USE_NSS */
 #endif							/* USE_SSL */
 
 #ifdef ENABLE_GSS
@@ -759,7 +782,7 @@ extern ssize_t pgtls_write(PGconn *conn, const void *ptr, size_t len);
  * This is not supported with old versions of OpenSSL that don't have
  * the X509_get_signature_nid() function.
  */
-#if defined(USE_OPENSSL) && defined(HAVE_X509_GET_SIGNATURE_NID)
+#if defined(USE_NSS) || (defined(USE_OPENSSL) && defined(HAVE_X509_GET_SIGNATURE_NID))
 #define HAVE_PGTLS_GET_PEER_CERTIFICATE_HASH
 extern char *pgtls_get_peer_certificate_hash(PGconn *conn, size_t *len);
 #endif
-- 
2.21.1 (Apple Git-122.3)

From c575be67573029f67783f1f4b8a6d62101ed0f53 Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Mon, 8 Feb 2021 23:52:55 +0100
Subject: [PATCH v27 9/9] nss: Build infrastructure

Finally this adds the infrastructure to build a postgres installation
with libnss support.
---
 configure                     | 294 +++++++++++++++++++++++++++++++++-
 configure.ac                  |  31 +++-
 src/backend/libpq/Makefile    |   4 +
 src/common/Makefile           |   6 +
 src/include/pg_config.h.in    |   6 +
 src/interfaces/libpq/Makefile |   5 +
 src/tools/msvc/Install.pm     |   3 +-
 src/tools/msvc/Mkvcbuild.pm   |  39 ++++-
 src/tools/msvc/Solution.pm    |  20 +++
 9 files changed, 396 insertions(+), 12 deletions(-)

diff --git a/configure b/configure
index ce9ea36999..143726c79c 100755
--- a/configure
+++ b/configure
@@ -654,6 +654,8 @@ UUID_LIBS
 LDAP_LIBS_BE
 LDAP_LIBS_FE
 with_ssl
+NSPR_CONFIG
+NSS_CONFIG
 PTHREAD_CFLAGS
 PTHREAD_LIBS
 PTHREAD_CC
@@ -1570,7 +1572,7 @@ Optional Packages:
                           use system time zone data in DIR
   --without-zlib          do not use Zlib
   --with-gnu-ld           assume the C compiler uses GNU ld [default=no]
-  --with-ssl=LIB          use LIB for SSL/TLS support (openssl)
+  --with-ssl=LIB          use LIB for SSL/TLS support (openssl, nss)
   --with-openssl          obsolete spelling of --with-ssl=openssl
 
 Some influential environment variables:
@@ -12462,8 +12464,274 @@ done
 
 $as_echo "#define USE_OPENSSL 1" >>confdefs.h
 
+elif test "$with_ssl" = nss ; then
+  # TODO: fallback in case nss-config/nspr-config aren't found.
+  if test -z "$NSS_CONFIG"; then
+  for ac_prog in nss-config
+do
+  # Extract the first word of "$ac_prog", so it can be a program name with args.
+set dummy $ac_prog; ac_word=$2
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
+$as_echo_n "checking for $ac_word... " >&6; }
+if ${ac_cv_path_NSS_CONFIG+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  case $NSS_CONFIG in
+  [\\/]* | ?:[\\/]*)
+  ac_cv_path_NSS_CONFIG="$NSS_CONFIG" # Let the user override the test with a path.
+  ;;
+  *)
+  as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH
+do
+  IFS=$as_save_IFS
+  test -z "$as_dir" && as_dir=.
+    for ac_exec_ext in '' $ac_executable_extensions; do
+  if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
+    ac_cv_path_NSS_CONFIG="$as_dir/$ac_word$ac_exec_ext"
+    $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
+    break 2
+  fi
+done
+  done
+IFS=$as_save_IFS
+
+  ;;
+esac
+fi
+NSS_CONFIG=$ac_cv_path_NSS_CONFIG
+if test -n "$NSS_CONFIG"; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $NSS_CONFIG" >&5
+$as_echo "$NSS_CONFIG" >&6; }
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+fi
+
+
+  test -n "$NSS_CONFIG" && break
+done
+
+else
+  # Report the value of NSS_CONFIG in configure's output in all cases.
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for NSS_CONFIG" >&5
+$as_echo_n "checking for NSS_CONFIG... " >&6; }
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $NSS_CONFIG" >&5
+$as_echo "$NSS_CONFIG" >&6; }
+fi
+
+  if test -z "$NSPR_CONFIG"; then
+  for ac_prog in nspr-config
+do
+  # Extract the first word of "$ac_prog", so it can be a program name with args.
+set dummy $ac_prog; ac_word=$2
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
+$as_echo_n "checking for $ac_word... " >&6; }
+if ${ac_cv_path_NSPR_CONFIG+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  case $NSPR_CONFIG in
+  [\\/]* | ?:[\\/]*)
+  ac_cv_path_NSPR_CONFIG="$NSPR_CONFIG" # Let the user override the test with a path.
+  ;;
+  *)
+  as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH
+do
+  IFS=$as_save_IFS
+  test -z "$as_dir" && as_dir=.
+    for ac_exec_ext in '' $ac_executable_extensions; do
+  if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
+    ac_cv_path_NSPR_CONFIG="$as_dir/$ac_word$ac_exec_ext"
+    $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
+    break 2
+  fi
+done
+  done
+IFS=$as_save_IFS
+
+  ;;
+esac
+fi
+NSPR_CONFIG=$ac_cv_path_NSPR_CONFIG
+if test -n "$NSPR_CONFIG"; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $NSPR_CONFIG" >&5
+$as_echo "$NSPR_CONFIG" >&6; }
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+fi
+
+
+  test -n "$NSPR_CONFIG" && break
+done
+
+else
+  # Report the value of NSPR_CONFIG in configure's output in all cases.
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for NSPR_CONFIG" >&5
+$as_echo_n "checking for NSPR_CONFIG... " >&6; }
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $NSPR_CONFIG" >&5
+$as_echo "$NSPR_CONFIG" >&6; }
+fi
+
+  if test -n "$NSS_CONFIG"; then
+    NSS_LIBS=`$NSS_CONFIG --libs`
+	NSS_CFLAGS=`$NSS_CONFIG --cflags`
+  fi
+  if test -n "$NSPR_CONFIG"; then
+	NSPR_LIBS=`$NSPR_CONFIG --libs`
+	NSPR_CFLAGS=`$NSPR_CONFIG --cflags`
+  fi
+
+  LDFLAGS="$LDFLAGS $NSS_LIBS $NSPR_LIBS"
+  CFLAGS="$CFLAGS $NSS_CFLAGS $NSPR_CFLAGS"
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for NSS_InitContext in -lnss3" >&5
+$as_echo_n "checking for NSS_InitContext in -lnss3... " >&6; }
+if ${ac_cv_lib_nss3_NSS_InitContext+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lnss3  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char NSS_InitContext ();
+int
+main ()
+{
+return NSS_InitContext ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_lib_nss3_NSS_InitContext=yes
+else
+  ac_cv_lib_nss3_NSS_InitContext=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_nss3_NSS_InitContext" >&5
+$as_echo "$ac_cv_lib_nss3_NSS_InitContext" >&6; }
+if test "x$ac_cv_lib_nss3_NSS_InitContext" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_LIBNSS3 1
+_ACEOF
+
+  LIBS="-lnss3 $LIBS"
+
+else
+  as_fn_error $? "library 'nss3' is required for NSS" "$LINENO" 5
+fi
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for PR_GetDefaultIOMethods in -lnspr4" >&5
+$as_echo_n "checking for PR_GetDefaultIOMethods in -lnspr4... " >&6; }
+if ${ac_cv_lib_nspr4_PR_GetDefaultIOMethods+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lnspr4  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char PR_GetDefaultIOMethods ();
+int
+main ()
+{
+return PR_GetDefaultIOMethods ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_lib_nspr4_PR_GetDefaultIOMethods=yes
+else
+  ac_cv_lib_nspr4_PR_GetDefaultIOMethods=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_nspr4_PR_GetDefaultIOMethods" >&5
+$as_echo "$ac_cv_lib_nspr4_PR_GetDefaultIOMethods" >&6; }
+if test "x$ac_cv_lib_nspr4_PR_GetDefaultIOMethods" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_LIBNSPR4 1
+_ACEOF
+
+  LIBS="-lnspr4 $LIBS"
+
+else
+  as_fn_error $? "library 'nspr4' is required for NSS" "$LINENO" 5
+fi
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for SSL_GetImplementedCiphers in -lssl3" >&5
+$as_echo_n "checking for SSL_GetImplementedCiphers in -lssl3... " >&6; }
+if ${ac_cv_lib_ssl3_SSL_GetImplementedCiphers+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lssl3  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char SSL_GetImplementedCiphers ();
+int
+main ()
+{
+return SSL_GetImplementedCiphers ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_lib_ssl3_SSL_GetImplementedCiphers=yes
+else
+  ac_cv_lib_ssl3_SSL_GetImplementedCiphers=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_ssl3_SSL_GetImplementedCiphers" >&5
+$as_echo "$ac_cv_lib_ssl3_SSL_GetImplementedCiphers" >&6; }
+if test "x$ac_cv_lib_ssl3_SSL_GetImplementedCiphers" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_LIBSSL3 1
+_ACEOF
+
+  LIBS="-lssl3 $LIBS"
+
+else
+  as_fn_error $? "library 'ssl3' is required for NSS" "$LINENO" 5
+fi
+
+
+$as_echo "#define USE_NSS 1" >>confdefs.h
+
 elif test "$with_ssl" != no ; then
-  as_fn_error $? "--with-ssl must specify openssl" "$LINENO" 5
+  as_fn_error $? "--with-ssl must specify one of openssl or nss" "$LINENO" 5
 fi
 
 
@@ -13369,6 +13637,23 @@ else
 fi
 
 
+elif test "$with_ssl" = nss ; then
+  ac_fn_c_check_header_mongrel "$LINENO" "nss/ssl.h" "ac_cv_header_nss_ssl_h" "$ac_includes_default"
+if test "x$ac_cv_header_nss_ssl_h" = xyes; then :
+
+else
+  as_fn_error $? "header file <nss/ssl.h> is required for NSS" "$LINENO" 5
+fi
+
+
+  ac_fn_c_check_header_mongrel "$LINENO" "nss/nss.h" "ac_cv_header_nss_nss_h" "$ac_includes_default"
+if test "x$ac_cv_header_nss_nss_h" = xyes; then :
+
+else
+  as_fn_error $? "header file <nss/nss.h> is required for NSS" "$LINENO" 5
+fi
+
+
 fi
 
 if test "$with_pam" = yes ; then
@@ -18131,6 +18416,9 @@ $as_echo_n "checking which random number source to use... " >&6; }
 if test x"$with_ssl" = x"openssl" ; then
   { $as_echo "$as_me:${as_lineno-$LINENO}: result: OpenSSL" >&5
 $as_echo "OpenSSL" >&6; }
+elif test x"$with_ssl" = x"nss" ; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: NSS" >&5
+$as_echo "NSS" >&6; }
 elif test x"$PORTNAME" = x"win32" ; then
   { $as_echo "$as_me:${as_lineno-$LINENO}: result: Windows native" >&5
 $as_echo "Windows native" >&6; }
@@ -18160,7 +18448,7 @@ fi
   if test x"$ac_cv_file__dev_urandom" = x"no" ; then
     as_fn_error $? "
 no source of strong random numbers was found
-PostgreSQL can use OpenSSL, native Windows API or /dev/urandom as a source of random numbers." "$LINENO" 5
+PostgreSQL can use OpenSSL, NSS, native Windows API or /dev/urandom as a source of random numbers." "$LINENO" 5
   fi
 fi
 
diff --git a/configure.ac b/configure.ac
index 07da84d401..59657a6010 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1201,7 +1201,7 @@ fi
 #
 # There is currently only one supported SSL/TLS library: OpenSSL.
 #
-PGAC_ARG_REQ(with, ssl, [LIB], [use LIB for SSL/TLS support (openssl)])
+PGAC_ARG_REQ(with, ssl, [LIB], [use LIB for SSL/TLS support (openssl, nss)])
 if test x"$with_ssl" = x"" ; then
   with_ssl=no
 fi
@@ -1235,8 +1235,28 @@ if test "$with_ssl" = openssl ; then
   # function was removed.
   AC_CHECK_FUNCS([CRYPTO_lock])
   AC_DEFINE([USE_OPENSSL], 1, [Define to 1 if you have OpenSSL support.])
+elif test "$with_ssl" = nss ; then
+  # TODO: fallback in case nss-config/nspr-config aren't found.
+  PGAC_PATH_PROGS(NSS_CONFIG, nss-config)
+  PGAC_PATH_PROGS(NSPR_CONFIG, nspr-config)
+  if test -n "$NSS_CONFIG"; then
+    NSS_LIBS=`$NSS_CONFIG --libs`
+	NSS_CFLAGS=`$NSS_CONFIG --cflags`
+  fi
+  if test -n "$NSPR_CONFIG"; then
+	NSPR_LIBS=`$NSPR_CONFIG --libs`
+	NSPR_CFLAGS=`$NSPR_CONFIG --cflags`
+  fi
+
+  LDFLAGS="$LDFLAGS $NSS_LIBS $NSPR_LIBS"
+  CFLAGS="$CFLAGS $NSS_CFLAGS $NSPR_CFLAGS"
+
+  AC_CHECK_LIB(nss3, NSS_InitContext, [], [AC_MSG_ERROR([library 'nss3' is required for NSS])])
+  AC_CHECK_LIB(nspr4, PR_GetDefaultIOMethods, [], [AC_MSG_ERROR([library 'nspr4' is required for NSS])])
+  AC_CHECK_LIB(ssl3, SSL_GetImplementedCiphers, [], [AC_MSG_ERROR([library 'ssl3' is required for NSS])])
+  AC_DEFINE([USE_NSS], 1, [Define to 1 if you have NSS support,])
 elif test "$with_ssl" != no ; then
-  AC_MSG_ERROR([--with-ssl must specify openssl])
+  AC_MSG_ERROR([--with-ssl must specify one of openssl or nss])
 fi
 AC_SUBST(with_ssl)
 
@@ -1414,6 +1434,9 @@ fi
 if test "$with_ssl" = openssl ; then
   AC_CHECK_HEADER(openssl/ssl.h, [], [AC_MSG_ERROR([header file <openssl/ssl.h> is required for OpenSSL])])
   AC_CHECK_HEADER(openssl/err.h, [], [AC_MSG_ERROR([header file <openssl/err.h> is required for OpenSSL])])
+elif test "$with_ssl" = nss ; then
+  AC_CHECK_HEADER(nss/ssl.h, [], [AC_MSG_ERROR([header file <nss/ssl.h> is required for NSS])])
+  AC_CHECK_HEADER(nss/nss.h, [], [AC_MSG_ERROR([header file <nss/nss.h> is required for NSS])])
 fi
 
 if test "$with_pam" = yes ; then
@@ -2170,6 +2193,8 @@ fi
 AC_MSG_CHECKING([which random number source to use])
 if test x"$with_ssl" = x"openssl" ; then
   AC_MSG_RESULT([OpenSSL])
+elif test x"$with_ssl" = x"nss" ; then
+  AC_MSG_RESULT([NSS])
 elif test x"$PORTNAME" = x"win32" ; then
   AC_MSG_RESULT([Windows native])
 else
@@ -2179,7 +2204,7 @@ else
   if test x"$ac_cv_file__dev_urandom" = x"no" ; then
     AC_MSG_ERROR([
 no source of strong random numbers was found
-PostgreSQL can use OpenSSL, native Windows API or /dev/urandom as a source of random numbers.])
+PostgreSQL can use OpenSSL, NSS, native Windows API or /dev/urandom as a source of random numbers.])
   fi
 fi
 
diff --git a/src/backend/libpq/Makefile b/src/backend/libpq/Makefile
index 8d1d16b0fc..045d2c2f6b 100644
--- a/src/backend/libpq/Makefile
+++ b/src/backend/libpq/Makefile
@@ -30,6 +30,10 @@ OBJS = \
 
 ifeq ($(with_ssl),openssl)
 OBJS += be-secure-openssl.o
+else
+ifeq ($(with_ssl),nss)
+OBJS += be-secure-nss.o
+endif
 endif
 
 ifeq ($(with_gssapi),yes)
diff --git a/src/common/Makefile b/src/common/Makefile
index 5422579a6a..57d44080b4 100644
--- a/src/common/Makefile
+++ b/src/common/Makefile
@@ -85,12 +85,18 @@ OBJS_COMMON += \
 	protocol_openssl.o \
 	cryptohash_openssl.o
 else
+ifeq ($(with_ssl),nss)
+OBJS_COMMON += \
+	cipher_nss.o \
+	cryptohash_nss.o
+else
 OBJS_COMMON += \
 	cryptohash.o \
 	md5.o \
 	sha1.o \
 	sha2.o
 endif
+endif
 
 # A few files are currently only built for frontend, not server
 # (Mkvcbuild.pm has a copy of this list, too).  logging.c is excluded
diff --git a/src/include/pg_config.h.in b/src/include/pg_config.h.in
index 55cab4d2bf..fa5a977617 100644
--- a/src/include/pg_config.h.in
+++ b/src/include/pg_config.h.in
@@ -905,6 +905,12 @@
 /* Define to 1 to build with PAM support. (--with-pam) */
 #undef USE_PAM
 
+/* Define to build with NSS support (--with-ssl=nss) */
+#undef USE_NSS
+
+/* Define to use NSS for random number generation */
+#undef USE_NSS_RANDOM
+
 /* Define to 1 to use software CRC-32C implementation (slicing-by-8). */
 #undef USE_SLICING_BY_8_CRC32C
 
diff --git a/src/interfaces/libpq/Makefile b/src/interfaces/libpq/Makefile
index f74677eaf9..e10d8bef42 100644
--- a/src/interfaces/libpq/Makefile
+++ b/src/interfaces/libpq/Makefile
@@ -56,6 +56,11 @@ OBJS += \
 	fe-secure-openssl.o
 endif
 
+ifeq ($(with_ssl), nss)
+OBJS += \
+	fe-secure-nss.o
+endif
+
 ifeq ($(with_gssapi),yes)
 OBJS += \
 	fe-gssapi-common.o \
diff --git a/src/tools/msvc/Install.pm b/src/tools/msvc/Install.pm
index ea3af48777..afe72a7e97 100644
--- a/src/tools/msvc/Install.pm
+++ b/src/tools/msvc/Install.pm
@@ -438,7 +438,8 @@ sub CopyContribFiles
 		{
 			# These configuration-based exclusions must match vcregress.pl
 			next if ($d eq "uuid-ossp"  && !defined($config->{uuid}));
-			next if ($d eq "sslinfo"    && !defined($config->{openssl}));
+			next if ($d eq "sslinfo"    && !defined($config->{openssl})
+			  && !defined($config->{nss}));
 			next if ($d eq "xml2"       && !defined($config->{xml}));
 			next if ($d =~ /_plperl$/   && !defined($config->{perl}));
 			next if ($d =~ /_plpython$/ && !defined($config->{python}));
diff --git a/src/tools/msvc/Mkvcbuild.pm b/src/tools/msvc/Mkvcbuild.pm
index 49614106dc..53b5a71726 100644
--- a/src/tools/msvc/Mkvcbuild.pm
+++ b/src/tools/msvc/Mkvcbuild.pm
@@ -132,6 +132,11 @@ sub mkvcbuild
 		push(@pgcommonallfiles, 'cryptohash_openssl.c');
 		push(@pgcommonallfiles, 'protocol_openssl.c');
 	}
+	elsif ($solution->{options}->{nss})
+	{
+		push(@pgcommonallfiles, 'cryptohash_nss.c');
+		push(@pgcommonallfiles, 'cipher_nss.c');
+	}
 	else
 	{
 		push(@pgcommonallfiles, 'cryptohash.c');
@@ -196,12 +201,19 @@ sub mkvcbuild
 	$postgres->FullExportDLL('postgres.lib');
 
 	# The OBJS scraper doesn't know about ifdefs, so remove appropriate files
-	# if building without OpenSSL.
-	if (!$solution->{options}->{openssl})
+	# if building without various options.
+	if (!$solution->{options}->{openssl} && !$solution->{options}->{nss})
 	{
 		$postgres->RemoveFile('src/backend/libpq/be-secure-common.c');
+	}
+	if (!$solution->{options}->{openssl})
+	{
 		$postgres->RemoveFile('src/backend/libpq/be-secure-openssl.c');
 	}
+	if (!$solution->{options}->{nss})
+	{
+		$postgres->RemoveFile('src/backend/libpq/be-secure-nss.c');
+	}
 	if (!$solution->{options}->{gss})
 	{
 		$postgres->RemoveFile('src/backend/libpq/be-gssapi-common.c');
@@ -259,12 +271,19 @@ sub mkvcbuild
 	$libpq->AddReference($libpgcommon, $libpgport);
 
 	# The OBJS scraper doesn't know about ifdefs, so remove appropriate files
-	# if building without OpenSSL.
-	if (!$solution->{options}->{openssl})
+	# if building without various options
+	if (!$solution->{options}->{openssl} && !$solution->{options}->{nss})
 	{
 		$libpq->RemoveFile('src/interfaces/libpq/fe-secure-common.c');
+	}
+	if (!$solution->{options}->{openssl})
+	{
 		$libpq->RemoveFile('src/interfaces/libpq/fe-secure-openssl.c');
 	}
+	if (!$solution->{options}->{nss})
+	{
+		$libpq->RemoveFile('src/interfaces/libpq/fe-secure-nss.c');
+	}
 	if (!$solution->{options}->{gss})
 	{
 		$libpq->RemoveFile('src/interfaces/libpq/fe-gssapi-common.c');
@@ -432,9 +451,14 @@ sub mkvcbuild
 		push @contrib_excludes, 'xml2';
 	}
 
+	if (!$solution->{options}->{openssl} && !$solution->{options}->{nss})
+	{
+		push @contrib_excludes, 'sslinfo';
+	}
+
 	if (!$solution->{options}->{openssl})
 	{
-		push @contrib_excludes, 'sslinfo', 'ssl_passphrase_callback';
+		push @contrib_excludes, 'ssl_passphrase_callback';
 	}
 
 	if (!$solution->{options}->{uuid})
@@ -464,6 +488,11 @@ sub mkvcbuild
 		$pgcrypto->AddFiles('contrib/pgcrypto', 'openssl.c',
 			'pgp-mpi-openssl.c');
 	}
+	elsif ($solution->{options}->{nss})
+	{
+		$pgcrypto->AddFiles('contrib/pgcrypto', 'nss.c',
+			'pgp-mpi-internal.c', 'imath.c', 'blf.c');
+	}
 	else
 	{
 		$pgcrypto->AddFiles(
diff --git a/src/tools/msvc/Solution.pm b/src/tools/msvc/Solution.pm
index 2aa062b2c9..0b0fbffa5e 100644
--- a/src/tools/msvc/Solution.pm
+++ b/src/tools/msvc/Solution.pm
@@ -488,6 +488,7 @@ sub GenerateFiles
 		USE_LLVM                   => undef,
 		USE_NAMED_POSIX_SEMAPHORES => undef,
 		USE_OPENSSL                => undef,
+		USE_NSS                    => undef,
 		USE_PAM                    => undef,
 		USE_SLICING_BY_8_CRC32C    => undef,
 		USE_SSE42_CRC32C           => undef,
@@ -540,6 +541,10 @@ sub GenerateFiles
 			$define{HAVE_OPENSSL_INIT_SSL}      = 1;
 		}
 	}
+	if ($self->{options}->{nss})
+	{
+		$define{USE_NSS} = 1;
+	}
 
 	$self->GenerateConfigHeader('src/include/pg_config.h',     \%define, 1);
 	$self->GenerateConfigHeader('src/include/pg_config_ext.h', \%define, 0);
@@ -1008,6 +1013,21 @@ sub AddProject
 			}
 		}
 	}
+	if ($self->{options}->{nss})
+	{
+		$proj->AddIncludeDir($self->{options}->{nss} . '\..\public\nss');
+		$proj->AddIncludeDir($self->{options}->{nss} . '\include\nspr');
+		foreach my $lib (qw(plds4 plc4 nspr4))
+		{
+			$proj->AddLibrary($self->{options}->{nss} .
+							  '\lib\lib' . "$lib.lib", 0);
+		}
+		foreach my $lib (qw(ssl3 smime3 nss3))
+		{
+			$proj->AddLibrary($self->{options}->{nss} .
+							  '\lib' . "\\$lib.dll.lib", 0);
+		}
+	}
 	if ($self->{options}->{nls})
 	{
 		$proj->AddIncludeDir($self->{options}->{nls} . '\include');
-- 
2.21.1 (Apple Git-122.3)

From eaaffa978450d909deae19522b1dd6ba51baf5a2 Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Mon, 8 Feb 2021 23:52:51 +0100
Subject: [PATCH v27 8/9] nss: Support NSS in cryptohash

This adds support for using libnss as a crypto backend for the built-
in cryptohash support. Much of this code is similar to the pgcrypto
support.
---
 src/common/cryptohash_nss.c | 264 ++++++++++++++++++++++++++++++++++++
 1 file changed, 264 insertions(+)
 create mode 100644 src/common/cryptohash_nss.c

diff --git a/src/common/cryptohash_nss.c b/src/common/cryptohash_nss.c
new file mode 100644
index 0000000000..59ba9c1697
--- /dev/null
+++ b/src/common/cryptohash_nss.c
@@ -0,0 +1,264 @@
+/*-------------------------------------------------------------------------
+ *
+ * cryptohash_nss.c
+ *	  Set of wrapper routines on top of NSS to support cryptographic
+ *	  hash functions.
+ *
+ * This should only be used if code is compiled with NSS support.
+ *
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ *		  src/common/cryptohash_nss.c
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#ifndef FRONTEND
+#include "postgres.h"
+#else
+#include "postgres_fe.h"
+#endif
+
+#include "common/nss.h"
+
+#include <nss/nss.h>
+#include <nss/hasht.h>
+#include <nss/pk11func.h>
+#include <nss/pk11pub.h>
+#include <nss/secitem.h>
+#include <nss/sechash.h>
+#include <nss/secoid.h>
+#include <nss/secerr.h>
+
+#include "common/cryptohash.h"
+#ifndef FRONTEND
+#include "utils/memutils.h"
+#include "utils/resowner.h"
+#include "utils/resowner_private.h"
+#endif
+
+/*
+ * In the backend, use an allocation in TopMemoryContext to count for
+ * resowner cleanup handling.  In the frontend, use malloc to be able
+ * to return a failure status back to the caller.
+ */
+#ifndef FRONTEND
+#define ALLOC(size) MemoryContextAlloc(TopMemoryContext, size)
+#define FREE(ptr) pfree(ptr)
+#else
+#define ALLOC(size) malloc(size)
+#define FREE(ptr) free(ptr)
+#endif
+
+/*
+ * Internal pg_cryptohash_ctx structure.
+ */
+struct pg_cryptohash_ctx
+{
+	pg_cryptohash_type type;
+
+	PK11Context *pk11_context;
+	HASH_HashType hash_type;
+
+#ifndef FRONTEND
+	ResourceOwner resowner;
+#endif
+};
+
+/*
+ * pg_cryptohash_create
+ *
+ * Create and allocate a new hash context. Returns NULL on failure in the
+ * frontend, and raise error without returning in the backend.
+ */
+pg_cryptohash_ctx *
+pg_cryptohash_create(pg_cryptohash_type type)
+{
+	NSSInitParameters params;
+	pg_cryptohash_ctx *ctx;
+	SECOidData *hash;
+	SECStatus status;
+
+#ifndef FRONTEND
+	/*
+	 * Make sure that the resource owner has space to remember this reference.
+	 * This can error out with "out of memory", so do this before any other
+	 * allocation to avoid leaking.
+	 */
+	ResourceOwnerEnlargeCryptoHash(CurrentResourceOwner);
+#endif
+
+	ctx = ALLOC(sizeof(pg_cryptohash_ctx));
+
+	if (!ctx)
+		goto error;
+
+	switch(type)
+	{
+		case PG_SHA1:
+			ctx->hash_type = SEC_OID_SHA1;
+			break;
+		case PG_MD5:
+			ctx->hash_type = SEC_OID_MD5;
+			break;
+		case PG_SHA224:
+			ctx->hash_type = SEC_OID_SHA224;
+			break;
+		case PG_SHA256:
+			ctx->hash_type = SEC_OID_SHA256;
+			break;
+		case PG_SHA384:
+			ctx->hash_type = SEC_OID_SHA384;
+			break;
+		case PG_SHA512:
+			ctx->hash_type = SEC_OID_SHA512;
+			break;
+	}
+
+	/*
+	 * Initialize our own NSS context without a database backing it.
+	 */
+	memset(&params, 0, sizeof(params));
+	params.length = sizeof(params);
+	status = NSS_NoDB_Init(".");
+	if (status != SECSuccess)
+	{
+		explicit_bzero(ctx, sizeof(pg_cryptohash_ctx));
+		FREE(ctx);
+		goto error;
+	}
+
+	ctx->type = type;
+	hash = SECOID_FindOIDByTag(ctx->hash_type);
+	ctx->pk11_context = PK11_CreateDigestContext(hash->offset);
+	if (!ctx->pk11_context)
+	{
+		explicit_bzero(ctx, sizeof(pg_cryptohash_ctx));
+		FREE(ctx);
+		goto error;
+	}
+
+#ifndef FRONTEND
+	ctx->resowner = CurrentResourceOwner;
+	ResourceOwnerRememberCryptoHash(CurrentResourceOwner,
+									PointerGetDatum(ctx));
+#endif
+
+	return ctx;
+
+error:
+#ifndef FRONTEND
+	ereport(ERROR,
+			(errcode(ERRCODE_OUT_OF_MEMORY),
+			 errmsg("out of memory")));
+#endif
+	return NULL;
+}
+
+/*
+ * pg_cryptohash_init
+ *			Initialize the passed hash context
+ *
+ * Returns 0 on success, -1 on failure.
+ */
+int
+pg_cryptohash_init(pg_cryptohash_ctx *ctx)
+{
+	SECStatus		status;
+
+	status = PK11_DigestBegin(ctx->pk11_context);
+
+	if (status != SECSuccess)
+		return -1;
+	return 0;
+}
+
+/*
+ * pg_cryptohash_update
+ *
+ * Update a hash context.  Returns 0 on success, -1 on failure.
+ */
+int
+pg_cryptohash_update(pg_cryptohash_ctx *ctx, const uint8 *data, size_t len)
+{
+	SECStatus	status;
+
+	if (ctx == NULL)
+		return -1;
+
+	status = PK11_DigestOp(ctx->pk11_context, data, len);
+	if (status != SECSuccess)
+		return -1;
+
+	return 0;
+}
+
+/*
+ * pg_cryptohash_final
+ *
+ * Finalize a hash context.  Returns 0 on success, -1 on failure.
+ */
+int
+pg_cryptohash_final(pg_cryptohash_ctx *ctx, uint8 *dest, size_t len)
+{
+	SECStatus	status;
+	unsigned int outlen;
+
+	switch (ctx->type)
+	{
+		case PG_MD5:
+			if (len < MD5_LENGTH)
+				return -1;
+			break;
+		case PG_SHA1:
+			if (len < SHA1_LENGTH)
+				return -1;
+			break;
+		case PG_SHA224:
+			if (len < SHA224_LENGTH)
+				return -1;
+			break;
+		case PG_SHA256:
+			if (len < SHA256_LENGTH)
+				return -1;
+			break;
+		case PG_SHA384:
+			if (len < SHA384_LENGTH)
+				return -1;
+			break;
+		case PG_SHA512:
+			if (len < SHA512_LENGTH)
+				return -1;
+			break;
+	}
+
+	status = PK11_DigestFinal(ctx->pk11_context, dest, &outlen, len);
+
+	if (status != SECSuccess)
+		return -1;
+
+	return 0;
+}
+
+/*
+ * pg_cryptohash_free
+ *
+ * Free a hash context and the associated NSS context.
+ */
+void
+pg_cryptohash_free(pg_cryptohash_ctx *ctx)
+{
+	PRBool		free_context = PR_TRUE;
+
+	if (!ctx)
+		return;
+
+	PK11_DestroyContext(ctx->pk11_context, free_context);
+#ifndef FRONTEND
+	ResourceOwnerForgetCryptoHash(ctx->resowner, PointerGetDatum(ctx));
+#endif
+	explicit_bzero(ctx, sizeof(pg_cryptohash_ctx));
+	FREE(ctx);
+}
-- 
2.21.1 (Apple Git-122.3)

From 8d918c0ca525fba5d8739c669829d8e4b8634f04 Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Mon, 8 Feb 2021 23:52:48 +0100
Subject: [PATCH v27 7/9] nss: Support NSS in sslinfo

Since sslinfo to a large extent use the be_tls_* API this mostly
disables functionality which currently is OpenSSL specific.
---
 contrib/sslinfo/sslinfo.c | 32 ++++++++++++++++++++++++++++++++
 doc/src/sgml/sslinfo.sgml | 12 +++++++++++-
 2 files changed, 43 insertions(+), 1 deletion(-)

diff --git a/contrib/sslinfo/sslinfo.c b/contrib/sslinfo/sslinfo.c
index 30cae0bb98..3aadd90aa6 100644
--- a/contrib/sslinfo/sslinfo.c
+++ b/contrib/sslinfo/sslinfo.c
@@ -9,9 +9,11 @@
 
 #include "postgres.h"
 
+#ifdef USE_OPENSSL
 #include <openssl/x509.h>
 #include <openssl/x509v3.h>
 #include <openssl/asn1.h>
+#endif
 
 #include "access/htup_details.h"
 #include "funcapi.h"
@@ -21,6 +23,7 @@
 
 PG_MODULE_MAGIC;
 
+#ifdef USE_OPENSSL
 static Datum X509_NAME_field_to_text(X509_NAME *name, text *fieldName);
 static Datum ASN1_STRING_to_text(ASN1_STRING *str);
 
@@ -31,6 +34,7 @@ typedef struct
 {
 	TupleDesc	tupdesc;
 } SSLExtensionInfoContext;
+#endif
 
 /*
  * Indicates whether current session uses SSL
@@ -131,6 +135,7 @@ ssl_client_serial(PG_FUNCTION_ARGS)
 }
 
 
+#ifdef USE_OPENSSL
 /*
  * Converts OpenSSL ASN1_STRING structure into text
  *
@@ -282,7 +287,23 @@ ssl_issuer_field(PG_FUNCTION_ARGS)
 	else
 		return result;
 }
+#endif							/* USE_OPENSSL */
 
+#ifdef USE_NSS
+PG_FUNCTION_INFO_V1(ssl_client_dn_field);
+Datum
+ssl_client_dn_field(PG_FUNCTION_ARGS)
+{
+	PG_RETURN_NULL();
+}
+
+PG_FUNCTION_INFO_V1(ssl_issuer_field);
+Datum
+ssl_issuer_field(PG_FUNCTION_ARGS)
+{
+	PG_RETURN_NULL();
+}
+#endif							/* USE_NSS */
 
 /*
  * Returns current client certificate subject as one string
@@ -338,6 +359,7 @@ ssl_issuer_dn(PG_FUNCTION_ARGS)
 }
 
 
+#ifdef USE_OPENSSL
 /*
  * Returns information about available SSL extensions.
  *
@@ -471,3 +493,13 @@ ssl_extension_info(PG_FUNCTION_ARGS)
 	/* All done */
 	SRF_RETURN_DONE(funcctx);
 }
+#endif							/* USE_OPENSSL */
+
+#ifdef USE_NSS
+PG_FUNCTION_INFO_V1(ssl_extension_info);
+Datum
+ssl_extension_info(PG_FUNCTION_ARGS)
+{
+	PG_RETURN_NULL();
+}
+#endif							/* USE_NSS */
diff --git a/doc/src/sgml/sslinfo.sgml b/doc/src/sgml/sslinfo.sgml
index 2a9c45a111..f3ae2fc3b8 100644
--- a/doc/src/sgml/sslinfo.sgml
+++ b/doc/src/sgml/sslinfo.sgml
@@ -22,7 +22,8 @@
 
  <para>
   This extension won't build at all unless the installation was
-  configured with <literal>--with-ssl=openssl</literal>.
+  configured with SSL support, such as <literal>--with-ssl=openssl</literal>
+  or <literal>--with-ssl=nss</literal>.
  </para>
 
  <sect2>
@@ -208,6 +209,9 @@ emailAddress
      the X.500 and X.509 standards, so you cannot just assign arbitrary
      meaning to them.
     </para>
+    <para>
+     This function is only available when using <productname>OpenSSL</productname>.
+    </para>
     </listitem>
    </varlistentry>
 
@@ -223,6 +227,9 @@ emailAddress
      Same as <function>ssl_client_dn_field</function>, but for the certificate issuer
      rather than the certificate subject.
     </para>
+    <para>
+     This function is only available when using <productname>OpenSSL</productname>.
+    </para>
     </listitem>
    </varlistentry>
 
@@ -238,6 +245,9 @@ emailAddress
      Provide information about extensions of client certificate: extension name,
      extension value, and if it is a critical extension.
     </para>
+    <para>
+     This function is only available when using <productname>OpenSSL</productname>.
+    </para>
     </listitem>
    </varlistentry>
   </variablelist>
-- 
2.21.1 (Apple Git-122.3)

From d385ea06bf58817860b2dc770c6e452a9fca5beb Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Mon, 8 Feb 2021 23:52:45 +0100
Subject: [PATCH v27 6/9] nss: Support NSS in pgcrypto

This extends pgcrypto to be able to use libnss as a cryptographic
backend for pgcrypto much like how OpenSSL is a supported backend.
Blowfish is not a supported cipher in NSS, so the implementation
falls back on the built-in BF code to be compatible in terms of
cipher support.
---
 contrib/pgcrypto/Makefile  |   7 +-
 contrib/pgcrypto/nss.c     | 753 +++++++++++++++++++++++++++++++++++++
 doc/src/sgml/pgcrypto.sgml |  38 +-
 3 files changed, 787 insertions(+), 11 deletions(-)
 create mode 100644 contrib/pgcrypto/nss.c

diff --git a/contrib/pgcrypto/Makefile b/contrib/pgcrypto/Makefile
index c0b4f1fcf6..ede7a78146 100644
--- a/contrib/pgcrypto/Makefile
+++ b/contrib/pgcrypto/Makefile
@@ -7,11 +7,14 @@ INT_TESTS = sha2
 OSSL_SRCS = openssl.c pgp-mpi-openssl.c
 OSSL_TESTS = sha2 des 3des cast5
 
+NSS_SRCS = nss.c pgp-mpi-internal.c imath.c blf.c
+NSS_TESTS = sha2 des 3des
+
 ZLIB_TST = pgp-compression
 ZLIB_OFF_TST = pgp-zlib-DISABLED
 
-CF_SRCS = $(if $(subst openssl,,$(with_ssl)), $(INT_SRCS), $(OSSL_SRCS))
-CF_TESTS = $(if $(subst openssl,,$(with_ssl)), $(INT_TESTS), $(OSSL_TESTS))
+CF_SRCS = $(if $(findstring openssl, $(with_ssl)), $(OSSL_SRCS), $(if $(findstring nss, $(with_ssl)), $(NSS_SRCS), $(INT_SRCS)))
+CF_TESTS = $(if $(findstring openssl, $(with_ssl)), $(OSSL_TESTS), $(if $(findstring nss, $(with_ssl)), $(NSS_TESTS), $(INT_TESTS)))
 CF_PGP_TESTS = $(if $(subst no,,$(with_zlib)), $(ZLIB_TST), $(ZLIB_OFF_TST))
 
 SRCS = \
diff --git a/contrib/pgcrypto/nss.c b/contrib/pgcrypto/nss.c
new file mode 100644
index 0000000000..d4fd4680ec
--- /dev/null
+++ b/contrib/pgcrypto/nss.c
@@ -0,0 +1,753 @@
+/*-------------------------------------------------------------------------
+ *
+ * nss.c
+ *	  Wrapper for using NSS as a backend for pgcrypto PX
+ *
+ *
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ *	  contrib/pgcrypto/nss.c
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#include "postgres.h"
+
+#include "px.h"
+#include "blf.h"
+#include "common/nss.h"
+#include "utils/memutils.h"
+
+#include <nss/nss.h>
+#include <nss/hasht.h>
+#include <nss/pk11func.h>
+#include <nss/pk11pub.h>
+#include <nss/secitem.h>
+#include <nss/sechash.h>
+#include <nss/secoid.h>
+#include <nss/secerr.h>
+
+/*
+ * Define our own mechanisms for Blowfish as it's not implemented by NSS.
+ */
+#define BLOWFISH_CBC	(1)
+#define BLOWFISH_ECB	(2)
+
+/*
+ * Data structures for recording cipher implementations as well as ongoing
+ * cipher operations.
+ */
+typedef struct nss_digest
+{
+	NSSInitContext *context;
+	PK11Context *hash_context;
+	HASH_HashType hash_type;
+}			nss_digest;
+
+typedef struct cipher_implementation
+{
+	/* Function pointers to cipher operations */
+	int			(*init) (PX_Cipher *pxc, const uint8 *key, unsigned klen, const uint8 *iv);
+	unsigned	(*get_block_size) (PX_Cipher *pxc);
+	unsigned	(*get_key_size) (PX_Cipher *pxc);
+	unsigned	(*get_iv_size) (PX_Cipher *pxc);
+	int			(*encrypt) (PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res);
+	int			(*decrypt) (PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res);
+	void		(*free) (PX_Cipher *pxc);
+
+	/* The mechanism describing the cipher used */
+	union
+	{
+		CK_MECHANISM_TYPE nss;
+		CK_ULONG	internal;
+	}			mechanism;
+	int			keylen;
+	bool		is_nss;
+}			cipher_implementation;
+
+typedef struct nss_cipher
+{
+	const cipher_implementation *impl;
+	NSSInitContext *context;
+	PK11Context *crypt_context;
+	SECItem    *params;
+
+	PK11SymKey *encrypt_key;
+	PK11SymKey *decrypt_key;
+}			nss_cipher;
+
+typedef struct internal_cipher
+{
+	const cipher_implementation *impl;
+	BlowfishContext context;
+}			internal_cipher;
+
+typedef struct nss_cipher_ref
+{
+	const char *name;
+	const cipher_implementation *impl;
+}			nss_cipher_ref;
+
+/*
+ * Prototypes
+ */
+static unsigned nss_get_iv_size(PX_Cipher *pxc);
+static unsigned nss_get_block_size(PX_Cipher *pxc);
+
+/*
+ * nss_GetHashOidTagByHashType
+ *
+ * Returns the corresponding SECOidTag for the passed hash type. NSS 3.43
+ * includes HASH_GetHashOidTagByHashType for this purpose, but at the time of
+ * writing is not commonly available so we need our own version till then.
+ */
+static SECOidTag
+nss_GetHashOidTagByHashType(HASH_HashType type)
+{
+	if (type == HASH_AlgMD2)
+		return SEC_OID_MD2;
+	if (type == HASH_AlgMD5)
+		return SEC_OID_MD5;
+	if (type == HASH_AlgSHA1)
+		return SEC_OID_SHA1;
+	if (type == HASH_AlgSHA224)
+		return SEC_OID_SHA224;
+	if (type == HASH_AlgSHA256)
+		return SEC_OID_SHA256;
+	if (type == HASH_AlgSHA384)
+		return SEC_OID_SHA384;
+	if (type == HASH_AlgSHA512)
+		return SEC_OID_SHA512;
+
+	return SEC_OID_UNKNOWN;
+}
+
+static unsigned
+nss_digest_block_size(PX_MD *pxmd)
+{
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+	const SECHashObject *object;
+
+	object = HASH_GetHashObject(digest->hash_type);
+	return object->blocklength;
+}
+
+static unsigned
+nss_digest_result_size(PX_MD *pxmd)
+{
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+	const SECHashObject *object;
+
+	object = HASH_GetHashObject(digest->hash_type);
+	return object->length;
+}
+
+static void
+nss_digest_free(PX_MD *pxmd)
+{
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+	PRBool		free_ctx = PR_TRUE;
+
+	PK11_DestroyContext(digest->hash_context, free_ctx);
+	NSS_ShutdownContext(digest->context);
+}
+
+static void
+nss_digest_update(PX_MD *pxmd, const uint8 *data, unsigned dlen)
+{
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+
+	PK11_DigestOp(digest->hash_context, data, dlen);
+}
+
+static void
+nss_digest_reset(PX_MD *pxmd)
+{
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+
+	PK11_DigestBegin(digest->hash_context);
+}
+
+static void
+nss_digest_finish(PX_MD *pxmd, uint8 *dst)
+{
+	unsigned int outlen;
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+	const SECHashObject *object;
+
+	object = HASH_GetHashObject(digest->hash_type);
+	PK11_DigestFinal(digest->hash_context, dst, &outlen, object->length);
+}
+
+int
+px_find_digest(const char *name, PX_MD **res)
+{
+	PX_MD	   *pxmd;
+	NSSInitParameters params;
+	NSSInitContext *nss_context;
+	bool		found = false;
+	nss_digest *digest;
+	SECStatus	status;
+	SECOidData *hash;
+	HASH_HashType t;
+
+	/*
+	 * Initialize our own NSS context without a database backing it.
+	 */
+	memset(&params, 0, sizeof(params));
+	params.length = sizeof(params);
+	nss_context = NSS_InitContext("", "", "", "", &params,
+								  NSS_INIT_READONLY | NSS_INIT_NOCERTDB |
+								  NSS_INIT_NOMODDB | NSS_INIT_FORCEOPEN |
+								  NSS_INIT_NOROOTINIT | NSS_INIT_PK11RELOAD);
+
+	/*
+	 * There is no API function for looking up a digest algorithm from a name
+	 * string, but there is a publicly accessible array which can be scanned
+	 * for the name.
+	 */
+	for (t = HASH_AlgNULL + 1; t < HASH_AlgTOTAL; t++)
+	{
+		SECOidTag	hash_oid;
+		char	   *p;
+
+		hash_oid = nss_GetHashOidTagByHashType(t);
+
+		if (hash_oid == SEC_OID_UNKNOWN)
+			return PXE_NO_HASH;
+
+		hash = SECOID_FindOIDByTag(hash_oid);
+		if (pg_strcasecmp(hash->desc, name) == 0)
+		{
+			found = true;
+			break;
+		}
+
+		/*
+		 * NSS saves the algorithm names using SHA-xxx notation whereas
+		 * OpenSSL use SHAxxx. To make sure the user finds the requested
+		 * algorithm let's remove the dash and compare that spelling as well.
+		 */
+		if ((p = strchr(hash->desc, '-')) != NULL)
+		{
+			char		tmp[12];
+
+			memcpy(tmp, hash->desc, p - hash->desc);
+			memcpy(tmp + (p - hash->desc), p + 1, strlen(hash->desc) - (p - hash->desc) + 1);
+			if (pg_strcasecmp(tmp, name) == 0)
+			{
+				found = true;
+				break;
+			}
+		}
+	}
+
+	if (!found)
+		return PXE_NO_HASH;
+
+	digest = palloc(sizeof(*digest));
+
+	digest->context = nss_context;
+	digest->hash_context = PK11_CreateDigestContext(hash->offset);
+	digest->hash_type = t;
+	if (digest->hash_context == NULL)
+	{
+		pfree(digest);
+		return -1;
+	}
+
+	status = PK11_DigestBegin(digest->hash_context);
+	if (status != SECSuccess)
+	{
+		PK11_DestroyContext(digest->hash_context, PR_TRUE);
+		pfree(digest);
+		return -1;
+	}
+
+	pxmd = palloc(sizeof(*pxmd));
+	pxmd->result_size = nss_digest_result_size;
+	pxmd->block_size = nss_digest_block_size;
+	pxmd->reset = nss_digest_reset;
+	pxmd->update = nss_digest_update;
+	pxmd->finish = nss_digest_finish;
+	pxmd->free = nss_digest_free;
+	pxmd->p.ptr = (void *) digest;
+
+	*res = pxmd;
+
+	return 0;
+}
+
+static int
+bf_init(PX_Cipher *pxc, const uint8 *key, unsigned klen, const uint8 *iv)
+{
+	internal_cipher *cipher = (internal_cipher *) pxc->ptr;
+
+	blowfish_setkey(&cipher->context, key, klen);
+	if (iv)
+		blowfish_setiv(&cipher->context, iv);
+
+	return 0;
+}
+
+static int
+bf_encrypt(PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res)
+{
+	internal_cipher *cipher = (internal_cipher *) pxc->ptr;
+	uint8	   *buf;
+
+	if (dlen == 0)
+		return 0;
+
+	if (dlen & 7)
+		return PXE_NOTBLOCKSIZE;
+
+	buf = palloc(dlen);
+	memcpy(buf, data, dlen);
+
+	if (cipher->impl->mechanism.internal == BLOWFISH_ECB)
+		blowfish_encrypt_ecb(buf, dlen, &cipher->context);
+	else
+		blowfish_encrypt_cbc(buf, dlen, &cipher->context);
+
+	memcpy(res, buf, dlen);
+	pfree(buf);
+
+	return 0;
+}
+
+static int
+bf_decrypt(PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res)
+{
+	internal_cipher *cipher = (internal_cipher *) pxc->ptr;
+
+	if (dlen == 0)
+		return 0;
+
+	if (dlen & 7)
+		return PXE_NOTBLOCKSIZE;
+
+	memcpy(res, data, dlen);
+	if (cipher->impl->mechanism.internal == BLOWFISH_ECB)
+		blowfish_decrypt_ecb(res, dlen, &cipher->context);
+	else
+		blowfish_decrypt_cbc(res, dlen, &cipher->context);
+
+	return 0;
+}
+
+static void
+bf_free(PX_Cipher *pxc)
+{
+	internal_cipher *cipher = (internal_cipher *) pxc->ptr;
+
+	pfree(cipher);
+	pfree(pxc);
+}
+
+static int
+nss_symkey_blockcipher_init(PX_Cipher *pxc, const uint8 *key, unsigned klen,
+							const uint8 *iv)
+{
+	nss_cipher *cipher = (nss_cipher *) pxc->ptr;
+	SECItem		iv_item;
+	unsigned char *iv_item_data;
+	SECItem		key_item;
+	int			keylen;
+	PK11SlotInfo *slot;
+
+	if (cipher->impl->mechanism.nss == CKM_AES_CBC ||
+		cipher->impl->mechanism.nss == CKM_AES_ECB)
+	{
+		if (klen <= 128 / 8)
+			keylen = 128 / 8;
+		else if (klen <= 192 / 8)
+			keylen = 192 / 8;
+		else if (klen <= 256 / 8)
+			keylen = 256 / 8;
+		else
+			return PXE_CIPHER_INIT;
+	}
+	else
+		keylen = cipher->impl->keylen;
+
+	key_item.type = siBuffer;
+	key_item.data = (unsigned char *) key;
+	key_item.len = keylen;
+
+	/*
+	 * If hardware acceleration is configured in NSS one can theoretically get
+	 * a better slot by calling PK11_GetBestSlot() with the mechanism passed
+	 * to it. Unless there are complaints, using the simpler API will make
+	 * error handling easier though.
+	 */
+	slot = PK11_GetInternalSlot();
+	if (!slot)
+		return PXE_CIPHER_INIT;
+
+	/*
+	 * The key must be set up for the operation, and since we don't know at
+	 * this point whether we are asked to encrypt or decrypt we need to store
+	 * both versions.
+	 */
+	cipher->decrypt_key = PK11_ImportSymKey(slot, cipher->impl->mechanism.nss,
+											PK11_OriginUnwrap,
+											CKA_DECRYPT, &key_item,
+											NULL);
+	cipher->encrypt_key = PK11_ImportSymKey(slot, cipher->impl->mechanism.nss,
+											PK11_OriginUnwrap,
+											CKA_ENCRYPT, &key_item,
+											NULL);
+	PK11_FreeSlot(slot);
+
+	if (!cipher->decrypt_key || !cipher->encrypt_key)
+		return PXE_CIPHER_INIT;
+
+	if (iv)
+	{
+		iv_item.type = siBuffer;
+		iv_item.data = (unsigned char *) iv;
+		iv_item.len = nss_get_iv_size(pxc);
+	}
+	else
+	{
+		/*
+		 * The documentation states that either passing .data = 0; .len = 0;
+		 * in the iv_item, or NULL as iv_item, to PK11_ParamFromIV should be
+		 * done when IV is missing. That however leads to segfaults in the
+		 * library, the workaround that works in modern  library versions is
+		 * to pass in a keysized zeroed out IV.
+		 */
+		iv_item_data = palloc0(nss_get_iv_size(pxc));
+		iv_item.type = siBuffer;
+		iv_item.data = iv_item_data;
+		iv_item.len = nss_get_iv_size(pxc);
+	}
+
+	cipher->params = PK11_ParamFromIV(cipher->impl->mechanism.nss, &iv_item);
+
+	/* If we had to make a mock IV, free it once made into a param */
+	if (!iv)
+		pfree(iv_item_data);
+
+	if (cipher->params == NULL)
+		return PXE_CIPHER_INIT;
+
+	return 0;
+}
+
+static int
+nss_decrypt(PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res)
+{
+	nss_cipher *cipher = (nss_cipher *) pxc->ptr;
+	SECStatus	status;
+	int			outlen;
+
+	if (!cipher->crypt_context)
+	{
+		cipher->crypt_context =
+			PK11_CreateContextBySymKey(cipher->impl->mechanism.nss, CKA_DECRYPT,
+									   cipher->decrypt_key, cipher->params);
+	}
+
+	status = PK11_CipherOp(cipher->crypt_context, res, &outlen, dlen, data, dlen);
+	if (status != SECSuccess)
+		return PXE_DECRYPT_FAILED;
+
+	return 0;
+}
+
+static int
+nss_encrypt(PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res)
+{
+	nss_cipher *cipher = (nss_cipher *) pxc->ptr;
+	SECStatus	status;
+	int			outlen;
+
+	if (!cipher->crypt_context)
+	{
+		cipher->crypt_context =
+			PK11_CreateContextBySymKey(cipher->impl->mechanism.nss, CKA_ENCRYPT,
+									   cipher->decrypt_key, cipher->params);
+	}
+
+	status = PK11_CipherOp(cipher->crypt_context, res, &outlen, dlen, data, dlen);
+
+	if (status != SECSuccess)
+		return PXE_DECRYPT_FAILED;
+
+	return 0;
+}
+
+static void
+nss_free(PX_Cipher *pxc)
+{
+	nss_cipher *cipher = pxc->ptr;
+	PRBool		free_ctx = PR_TRUE;
+
+	PK11_FreeSymKey(cipher->encrypt_key);
+	PK11_FreeSymKey(cipher->decrypt_key);
+	PK11_DestroyContext(cipher->crypt_context, free_ctx);
+	NSS_ShutdownContext(cipher->context);
+	pfree(cipher);
+
+	pfree(pxc);
+}
+
+static unsigned
+nss_get_block_size(PX_Cipher *pxc)
+{
+	nss_cipher *cipher = pxc->ptr;
+
+	return PK11_GetBlockSize(cipher->impl->mechanism.nss, NULL);
+}
+
+static unsigned
+nss_get_key_size(PX_Cipher *pxc)
+{
+	nss_cipher *cipher = pxc->ptr;
+
+	return cipher->impl->keylen;
+}
+
+static unsigned
+nss_get_iv_size(PX_Cipher *pxc)
+{
+	nss_cipher *cipher = pxc->ptr;
+
+	return PK11_GetIVLength(cipher->impl->mechanism.nss);
+}
+
+static unsigned
+bf_get_block_size(PX_Cipher *pxc)
+{
+	return 8;
+}
+
+static unsigned
+bf_get_key_size(PX_Cipher *pxc)
+{
+	return 448 / 8;
+}
+
+static unsigned
+bf_get_iv_size(PX_Cipher *pxc)
+{
+	return 8;
+}
+
+/*
+ * Cipher Implementations
+ */
+static const cipher_implementation nss_des_cbc = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_DES_CBC,
+	.keylen = 8,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_des_ecb = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_DES_ECB,
+	.keylen = 8,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_des3_cbc = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_DES3_CBC,
+	.keylen = 24,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_des3_ecb = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_DES3_ECB,
+	.keylen = 24,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_aes_cbc = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_AES_CBC,
+	.keylen = 32,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_aes_ecb = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_AES_ECB,
+	.keylen = 32,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_bf_ecb = {
+	.init = bf_init,
+	.get_block_size = bf_get_block_size,
+	.get_key_size = bf_get_key_size,
+	.get_iv_size = bf_get_iv_size,
+	.encrypt = bf_encrypt,
+	.decrypt = bf_decrypt,
+	.free = bf_free,
+	.mechanism.internal = BLOWFISH_ECB,
+	.keylen = 56,
+	.is_nss = false
+};
+
+static const cipher_implementation nss_bf_cbc = {
+	.init = bf_init,
+	.get_block_size = bf_get_block_size,
+	.get_key_size = bf_get_key_size,
+	.get_iv_size = bf_get_iv_size,
+	.encrypt = bf_encrypt,
+	.decrypt = bf_decrypt,
+	.free = bf_free,
+	.mechanism.internal = BLOWFISH_CBC,
+	.keylen = 56,
+	.is_nss = false
+};
+
+/*
+ * Lookup table for finding the implementation based on a name. CAST5 as well
+ * as BLOWFISH are defined as cipher mechanisms in NSS but error out with
+ * SEC_ERROR_INVALID_ALGORITHM. Blowfish is implemented using the internal
+ * implementation while CAST5 isn't supported at all at this time,
+ */
+static const nss_cipher_ref nss_cipher_lookup[] = {
+	{"des", &nss_des_cbc},
+	{"des-cbc", &nss_des_cbc},
+	{"des-ecb", &nss_des_ecb},
+	{"des3-cbc", &nss_des3_cbc},
+	{"3des", &nss_des3_cbc},
+	{"3des-cbc", &nss_des3_cbc},
+	{"des3-ecb", &nss_des3_ecb},
+	{"3des-ecb", &nss_des3_ecb},
+	{"aes", &nss_aes_cbc},
+	{"aes-cbc", &nss_aes_cbc},
+	{"aes-ecb", &nss_aes_ecb},
+	{"rijndael", &nss_aes_cbc},
+	{"rijndael-cbc", &nss_aes_cbc},
+	{"rijndael-ecb", &nss_aes_ecb},
+	{"blowfish", &nss_bf_cbc},
+	{"blowfish-cbc", &nss_bf_cbc},
+	{"blowfish-ecb", &nss_bf_ecb},
+	{"bf", &nss_bf_cbc},
+	{"bf-cbc", &nss_bf_cbc},
+	{"bf-ecb", &nss_bf_ecb},
+	{NULL}
+};
+
+/*
+ * px_find_cipher
+ *
+ * Search for the requested cipher and see if there is support for it, and if
+ * so return an allocated object containing the playbook for how to encrypt
+ * and decrypt using the cipher.
+ */
+int
+px_find_cipher(const char *alias, PX_Cipher **res)
+{
+	const nss_cipher_ref *cipher_ref;
+	PX_Cipher  *px_cipher;
+	NSSInitParameters params;
+	NSSInitContext *nss_context;
+	nss_cipher *cipher;
+	internal_cipher *int_cipher;
+
+	for (cipher_ref = nss_cipher_lookup; cipher_ref->name; cipher_ref++)
+	{
+		if (strcmp(cipher_ref->name, alias) == 0)
+			break;
+	}
+
+	if (!cipher_ref->name)
+		return PXE_NO_CIPHER;
+
+	/*
+	 * Fill in the PX_Cipher to pass back to PX describing the operations to
+	 * perform in order to use the cipher.
+	 */
+	px_cipher = palloc(sizeof(*px_cipher));
+	px_cipher->block_size = cipher_ref->impl->get_block_size;
+	px_cipher->key_size = cipher_ref->impl->get_key_size;
+	px_cipher->iv_size = cipher_ref->impl->get_iv_size;
+	px_cipher->free = cipher_ref->impl->free;
+	px_cipher->init = cipher_ref->impl->init;
+	px_cipher->encrypt = cipher_ref->impl->encrypt;
+	px_cipher->decrypt = cipher_ref->impl->decrypt;
+
+	/*
+	 * Set the private data, which is different for NSS and internal ciphers
+	 */
+	if (cipher_ref->impl->is_nss)
+	{
+		/*
+		 * Initialize our own NSS context without a database backing it. At
+		 * some point we might want to allow users to use stored keys in the
+		 * database rather than passing them via SELECT encrypt(), and then
+		 * this need to be changed to open a user specified database.
+		 */
+		memset(&params, 0, sizeof(params));
+		params.length = sizeof(params);
+		nss_context = NSS_InitContext("", "", "", "", &params,
+									  NSS_INIT_READONLY | NSS_INIT_NOCERTDB |
+									  NSS_INIT_NOMODDB | NSS_INIT_FORCEOPEN |
+									  NSS_INIT_NOROOTINIT | NSS_INIT_PK11RELOAD);
+
+		/* nss_cipher is the private state struct for the operation */
+		cipher = palloc(sizeof(*cipher));
+		cipher->context = nss_context;
+		cipher->impl = cipher_ref->impl;
+		cipher->crypt_context = NULL;
+
+		px_cipher->ptr = cipher;
+	}
+	else
+	{
+		int_cipher = palloc0(sizeof(*int_cipher));
+
+		int_cipher->impl = cipher_ref->impl;
+		px_cipher->ptr = int_cipher;
+	}
+
+	*res = px_cipher;
+	return 0;
+}
diff --git a/doc/src/sgml/pgcrypto.sgml b/doc/src/sgml/pgcrypto.sgml
index b6bb23de0f..bf486f0c07 100644
--- a/doc/src/sgml/pgcrypto.sgml
+++ b/doc/src/sgml/pgcrypto.sgml
@@ -45,8 +45,9 @@ digest(data bytea, type text) returns bytea
     <literal>sha224</literal>, <literal>sha256</literal>,
     <literal>sha384</literal> and <literal>sha512</literal>.
     If <filename>pgcrypto</filename> was built with
-    <productname>OpenSSL</productname>, more algorithms are available, as
-    detailed in <xref linkend="pgcrypto-with-without-openssl"/>.
+    <productname>OpenSSL</productname> or <productname>NSS</productname>,
+    more algorithms are available, as
+    detailed in <xref linkend="pgcrypto-with-without-openssl-nss"/>.
    </para>
 
    <para>
@@ -764,7 +765,7 @@ pgp_sym_encrypt(data, psw, 'compress-algo=1, cipher-algo=aes256')
     Which cipher algorithm to use.
    </para>
 <literallayout>
-Values: bf, aes128, aes192, aes256 (OpenSSL-only: <literal>3des</literal>, <literal>cast5</literal>)
+Values: bf, aes128, aes192, aes256 (OpenSSL-only: <literal>3des</literal>, <literal>cast5</literal>; NSS-only: <literal>3des</literal>)
 Default: aes128
 Applies to: pgp_sym_encrypt, pgp_pub_encrypt
 </literallayout>
@@ -1153,8 +1154,8 @@ gen_random_uuid() returns uuid
    <para>
     <filename>pgcrypto</filename> configures itself according to the findings of the
     main PostgreSQL <literal>configure</literal> script.  The options that
-    affect it are <literal>--with-zlib</literal> and
-    <literal>--with-ssl=openssl</literal>.
+    affect it are <literal>--with-zlib</literal>,
+    <literal>--with-ssl=openssl</literal> and <literal>--with-ssl=nss</literal>.
    </para>
 
    <para>
@@ -1169,14 +1170,16 @@ gen_random_uuid() returns uuid
     BIGNUM functions.
    </para>
 
-   <table id="pgcrypto-with-without-openssl">
-    <title>Summary of Functionality with and without OpenSSL</title>
-    <tgroup cols="3">
+   <table id="pgcrypto-with-without-openssl-nss">
+    <title>Summary of Functionality with and without external cryptographic
+      library</title>
+    <tgroup cols="4">
      <thead>
       <row>
        <entry>Functionality</entry>
        <entry>Built-in</entry>
        <entry>With OpenSSL</entry>
+       <entry>With NSS</entry>
       </row>
      </thead>
      <tbody>
@@ -1184,51 +1187,67 @@ gen_random_uuid() returns uuid
        <entry>MD5</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>SHA1</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>SHA224/256/384/512</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>Other digest algorithms</entry>
        <entry>no</entry>
        <entry>yes (Note 1)</entry>
+       <entry>yes (Note 1)</entry>
       </row>
       <row>
        <entry>Blowfish</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>AES</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>DES/3DES/CAST5</entry>
        <entry>no</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
+      </row>
+      <row>
+       <entry>CAST5</entry>
+       <entry>no</entry>
+       <entry>yes</entry>
+       <entry>no</entry>
       </row>
       <row>
        <entry>Raw encryption</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>PGP Symmetric encryption</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>PGP Public-Key encryption</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
      </tbody>
     </tgroup>
@@ -1241,7 +1260,8 @@ gen_random_uuid() returns uuid
    <orderedlist>
     <listitem>
      <para>
-      Any digest algorithm <productname>OpenSSL</productname> supports
+      Any digest algorithm <productname>OpenSSL</productname> and
+      <productname>NSS</productname> supports
       is automatically picked up.
       This is not possible with ciphers, which need to be supported
       explicitly.
-- 
2.21.1 (Apple Git-122.3)

From d8e599419f1ed7f1bb7e0215fc579f821f14b2d6 Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Mon, 8 Feb 2021 23:52:42 +0100
Subject: [PATCH v27 5/9] nss: Documentation

Basic documentation of the new API (keypass hooks) as well as config
parameters and installation. Additionally there is a section on how
to create certificate and keys using the NSS toolchain.
---
 doc/src/sgml/acronyms.sgml     |  43 +++++
 doc/src/sgml/config.sgml       |  28 ++-
 doc/src/sgml/installation.sgml |  31 +++-
 doc/src/sgml/libpq.sgml        | 305 ++++++++++++++++++++++++++-------
 doc/src/sgml/runtime.sgml      | 124 +++++++++++++-
 5 files changed, 453 insertions(+), 78 deletions(-)

diff --git a/doc/src/sgml/acronyms.sgml b/doc/src/sgml/acronyms.sgml
index 4e5ec983c0..7b02c8a622 100644
--- a/doc/src/sgml/acronyms.sgml
+++ b/doc/src/sgml/acronyms.sgml
@@ -441,6 +441,28 @@
     </listitem>
    </varlistentry>
 
+   <varlistentry>
+    <term><acronym>NSPR</acronym></term>
+    <listitem>
+     <para>
+      <ulink
+      url="https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSPR">
+      Netscape Portable Runtime</ulink>
+     </para>
+    </listitem>
+   </varlistentry>
+
+   <varlistentry>
+    <term><acronym>NSS</acronym></term>
+    <listitem>
+     <para>
+      <ulink
+      url="https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS">
+      Network Security Services</ulink>
+     </para>
+    </listitem>
+   </varlistentry>
+
    <varlistentry>
     <term><acronym>ODBC</acronym></term>
     <listitem>
@@ -539,6 +561,17 @@
     </listitem>
    </varlistentry>
 
+   <varlistentry>
+    <term><acronym>PKCS#12</acronym></term>
+    <listitem>
+     <para>
+      <ulink
+      url="https://en.wikipedia.org/wiki/PKCS_12">
+      Public-Key Cryptography Standards #12</ulink>
+     </para>
+    </listitem>
+   </varlistentry>
+
    <varlistentry>
     <term><acronym>PL</acronym></term>
     <listitem>
@@ -684,6 +717,16 @@
     </listitem>
    </varlistentry>
 
+   <varlistentry>
+    <term><acronym>TLS</acronym></term>
+    <listitem>
+     <para>
+      <ulink url="https://en.wikipedia.org/wiki/Transport_Layer_Security">
+      Transport Layer Security</ulink>
+     </para>
+    </listitem>
+   </varlistentry>
+
    <varlistentry>
     <term><acronym>TOAST</acronym></term>
     <listitem>
diff --git a/doc/src/sgml/config.sgml b/doc/src/sgml/config.sgml
index 4df1405d2e..a260d42296 100644
--- a/doc/src/sgml/config.sgml
+++ b/doc/src/sgml/config.sgml
@@ -1238,6 +1238,23 @@ include_dir 'conf.d'
       </listitem>
      </varlistentry>
 
+     <varlistentry id="guc-ssl-database" xreflabel="ssl_database">
+      <term><varname>ssl_database</varname> (<type>string</type>)
+      <indexterm>
+       <primary><varname>ssl_database</varname> configuration parameter</primary>
+      </indexterm>
+      </term>
+      <listitem>
+       <para>
+        Specifies the name of the file containing the server certificates and
+        keys when using <productname>NSS</productname> for <acronym>SSL</acronym>
+        connections. This parameter can only be set in the
+        <filename>postgresql.conf</filename> file or on the server command
+        line.
+       </para>
+      </listitem>
+     </varlistentry>
+
      <varlistentry id="guc-ssl-ciphers" xreflabel="ssl_ciphers">
       <term><varname>ssl_ciphers</varname> (<type>string</type>)
       <indexterm>
@@ -1254,7 +1271,9 @@ include_dir 'conf.d'
         connections using TLS version 1.2 and lower are affected.  There is
         currently no setting that controls the cipher choices used by TLS
         version 1.3 connections.  The default value is
-        <literal>HIGH:MEDIUM:+3DES:!aNULL</literal>.  The default is usually a
+        <literal>HIGH:MEDIUM:+3DES:!aNULL</literal> for servers which have
+        been built with <productname>OpenSSL</productname> as the
+        <acronym>SSL</acronym> library.  The default is usually a
         reasonable choice unless you have specific security requirements.
        </para>
 
@@ -1456,8 +1475,11 @@ include_dir 'conf.d'
        <para>
         Sets an external command to be invoked when a passphrase for
         decrypting an SSL file such as a private key needs to be obtained.  By
-        default, this parameter is empty, which means the built-in prompting
-        mechanism is used.
+        default, this parameter is empty. When the server is using
+        <productname>OpenSSL</productname>, this means the built-in prompting
+        mechanism is used. When using <productname>NSS</productname>, there is
+        no default prompting so a blank callback will be used returning an
+        empty password.
        </para>
        <para>
         The command must print the passphrase to the standard output and exit
diff --git a/doc/src/sgml/installation.sgml b/doc/src/sgml/installation.sgml
index 66ad4ba938..3cbd125d59 100644
--- a/doc/src/sgml/installation.sgml
+++ b/doc/src/sgml/installation.sgml
@@ -976,14 +976,31 @@ build-postgresql:
        <listitem>
         <para>
          Build with support for <acronym>SSL</acronym> (encrypted)
-         connections. The only <replaceable>LIBRARY</replaceable>
-         supported is <option>openssl</option>. This requires the
-         <productname>OpenSSL</productname> package to be installed.
-         <filename>configure</filename> will check for the required
-         header files and libraries to make sure that your
-         <productname>OpenSSL</productname> installation is sufficient
-         before proceeding. 
+         connections. <replaceable>LIBRARY</replaceable> must be one of:
         </para>
+        <itemizedlist>
+         <listitem>
+          <para>
+           <option>openssl</option> to build with <productname>OpenSSL</productname> support.
+            This requires the <productname>OpenSSL</productname>
+            package to be installed.  <filename>configure</filename> will check
+            for the required header files and libraries to make sure that
+            your <productname>OpenSSL</productname> installation is sufficient
+            before proceeding.
+          </para>
+         </listitem>
+         <listitem>
+          <para>
+           <option>nss</option> to build with <productname>libnss</productname> support.
+            This requires the <productname>NSS</productname> package to be installed. Additionally,
+            <productname>NSS</productname> requires <productname>NSPR</productname>
+            to be installed. <filename>configure</filename> will check for the
+            required header files and libraries to make sure that your
+            <productname>NSS</productname> installation is sufficient before
+            proceeding.
+          </para>
+         </listitem>
+        </itemizedlist>
        </listitem>
       </varlistentry>
 
diff --git a/doc/src/sgml/libpq.sgml b/doc/src/sgml/libpq.sgml
index b7a82453f0..d490134b64 100644
--- a/doc/src/sgml/libpq.sgml
+++ b/doc/src/sgml/libpq.sgml
@@ -830,6 +830,12 @@ int callback_fn(char *buf, int size, PGconn *conn);
        <function>longjmp(...)</function>, etc. It must return normally.
       </para>
 
+      <para>
+        <function>PQsetSSLKeyPassHook_OpenSSL</function> has no effect unless
+        the server was compiled with <productname>OpenSSL</productname>
+        support.
+      </para>
+
      </listitem>
     </varlistentry>
 
@@ -846,6 +852,70 @@ PQsslKeyPassHook_OpenSSL_type PQgetSSLKeyPassHook_OpenSSL(void);
 </synopsis>
       </para>
 
+      <para>
+        <function>PQgetSSLKeyPassHook_OpenSSL</function> has no effect unless
+        the server was compiled with <productname>OpenSSL</productname>
+        support.
+      </para>
+
+     </listitem>
+    </varlistentry>
+
+    <varlistentry id="libpq-pqsetsslkeypasshook-nss">
+     <term><function>PQsetSSLKeyPassHook_nss</function><indexterm><primary>PQsetSSLKeyPassHook_nss</primary></indexterm></term>
+     <listitem>
+      <para>
+       <function>PQsetSSLKeyPassHook_nss</function> lets an application override
+       <application>libpq</application>'s default handling of password protected
+       objects in the <application>NSS</application> database using
+       <xref linkend="libpq-connect-sslpassword"/> or interactive prompting.
+
+<synopsis>
+void PQsetSSLKeyPassHook_nss(PQsslKeyPassHook_nss_type hook);
+</synopsis>
+
+       The application passes a pointer to a callback function with signature:
+<programlisting>
+char *callback_fn(PK11SlotInfo *slot, PRBool retry, void *arg);
+</programlisting>
+       which <application>libpq</application> will call
+       <emphasis>instead of</emphasis> its default
+       <function>PQdefaultSSLKeyPassHook_nss</function> password handler. The
+       callback should determine the password for the token and return a
+       pointer to it. The returned pointer should be allocated with the NSS
+       <function>PORT_Strdup</function> function. The token for which the
+       password is requested is recorded in the slot anc can be identified by
+       calling <function>PK11_GetTokenName</function>. If no password is
+       known, the callback should return <literal>NULL</literal>. The memory
+       will be owned by <productname>NSS</productname> and should not be
+       freed.
+      </para>
+
+      <para>
+        <function>PQsetSSLKeyPassHook_nss</function> has no effect unless
+        the server was compiled with <productname>NSS</productname> support.
+      </para>
+     </listitem>
+    </varlistentry>
+
+    <varlistentry id="libpq-pqgetsslkeypasshook-nss">
+     <term><function>PQgetSSLKeyPassHook_nss</function><indexterm><primary>PQgetSSLKeyPassHook_nss</primary></indexterm></term>
+     <listitem>
+      <para>
+       <function>PQgetSSLKeyPassHook_nss</function> returns the current
+       <productname>NSS</productname> password hook, or <literal>NULL</literal>
+       if none has been set.
+
+<synopsis>
+PQsslKeyPassHook_nss_type PQgetSSLKeyPassHook_nss(void);
+</synopsis>
+      </para>
+
+      <para>
+        <function>PQgetSSLKeyPassHook_nss</function> has no effect unless the
+        server was compiled with <productname>nss</productname> support.
+      </para>
+
      </listitem>
     </varlistentry>
 
@@ -1623,21 +1693,31 @@ postgresql://%2Fvar%2Flib%2Fpostgresql/dbname
         If set to 1, data sent over SSL connections will be compressed.  If
         set to 0, compression will be disabled.  The default is 0.  This
         parameter is ignored if a connection without SSL is made.
-       </para>
-
-       <para>
         SSL compression is nowadays considered insecure and its use is no
-        longer recommended.  <productname>OpenSSL</productname> 1.1.0 disables
-        compression by default, and many operating system distributions
-        disable it in prior versions as well, so setting this parameter to on
-        will not have any effect if the server does not accept compression.
-       </para>
+        longer recommended.
+        <itemizedlist>
+         <listitem>
+          <para>
+           <productname>OpenSSL</productname>: 1.1.0 disables compression by
+           default, and many operating system distributions disable it in prior
+           versions as well, so setting this parameter to on will not have any
+           effect if the server does not accept compression.
+          </para>
+          <para>
+           If security is not a primary concern, compression can improve
+           throughput if the network is the bottleneck.  Disabling compression
+           can improve response time and throughput if CPU performance is the
+           limiting factor.
+          </para>
+         </listitem>
 
-       <para>
-        If security is not a primary concern, compression can improve
-        throughput if the network is the bottleneck.  Disabling compression
-        can improve response time and throughput if CPU performance is the
-        limiting factor.
+         <listitem>
+          <para>
+           <productname>NSS</productname>: SSL compression is not supported in
+           <productname>NSS</productname>, this parameter has no effect.
+          </para>
+         </listitem>
+        </itemizedlist>
        </para>
       </listitem>
      </varlistentry>
@@ -1646,10 +1726,24 @@ postgresql://%2Fvar%2Flib%2Fpostgresql/dbname
       <term><literal>sslcert</literal></term>
       <listitem>
        <para>
-        This parameter specifies the file name of the client SSL
-        certificate, replacing the default
-        <filename>~/.postgresql/postgresql.crt</filename>.
-        This parameter is ignored if an SSL connection is not made.
+        This parameter specifies the name or location of the client SSL
+        certificate.  This parameter is ignored if an SSL connection is not
+        made.
+        <itemizedlist>
+         <listitem>
+          <para>
+           <productname>OpenSSL</productname>: can replace the default
+           <filename>~/.postgresql/postgresql.crt</filename>.
+          </para>
+         </listitem>
+
+         <listitem>
+          <para>
+           <productname>NSS</productname>: the nickname of the client SSL
+           certificate.
+          </para>
+         </listitem>
+        </itemizedlist>
        </para>
       </listitem>
      </varlistentry>
@@ -1658,15 +1752,30 @@ postgresql://%2Fvar%2Flib%2Fpostgresql/dbname
       <term><literal>sslkey</literal></term>
       <listitem>
        <para>
-        This parameter specifies the location for the secret key used for
-        the client certificate. It can either specify a file name that will
-        be used instead of the default
-        <filename>~/.postgresql/postgresql.key</filename>, or it can specify a key
-        obtained from an external <quote>engine</quote> (engines are
-        <productname>OpenSSL</productname> loadable modules).  An external engine
-        specification should consist of a colon-separated engine name and
-        an engine-specific key identifier.  This parameter is ignored if an
-        SSL connection is not made.
+        This parameter specifies the name or location for the secret key used
+        for the client certificate. This parameter is ignored if an SSL
+        connection is not made.
+        <itemizedlist>
+         <listitem>
+          <para>
+           <productname>OpenSSL</productname>: can either specify a file name
+           that will be used instead of the default
+           <filename>~/.postgresql/postgresql.key</filename>, or it can specify
+           a key obtained from an external <quote>engine</quote> (engines are
+           <productname>OpenSSL</productname> loadable modules).  An external
+           engine specification should consist of a colon-separated engine name
+           and an engine-specific key identifier.
+          </para>
+         </listitem>
+
+         <listitem>
+          <para>
+           <productname>NSS</productname>: this parameter has no effect.  Keys
+           should be loaded into the <productname>NSS</productname>
+           database.
+          </para>
+         </listitem>
+        </itemizedlist>
        </para>
       </listitem>
      </varlistentry>
@@ -1677,28 +1786,44 @@ postgresql://%2Fvar%2Flib%2Fpostgresql/dbname
        <para>
         This parameter specifies the password for the secret key specified in
         <literal>sslkey</literal>, allowing client certificate private keys
-        to be stored in encrypted form on disk even when interactive passphrase
+        to be stored in encrypted form even when interactive passphrase
         input is not practical.
-       </para>
-       <para>
-        Specifying this parameter with any non-empty value suppresses the
-        <literal>Enter PEM pass phrase:</literal>
-        prompt that <productname>OpenSSL</productname> will emit by default
-        when an encrypted client certificate key is provided to
-        <literal>libpq</literal>.
-       </para>
-       <para>
-        If the key is not encrypted this parameter is ignored. The parameter
-        has no effect on keys specified by <productname>OpenSSL</productname>
-        engines unless the engine uses the <productname>OpenSSL</productname>
-        password callback mechanism for prompts.
-       </para>
-       <para>
-        There is no environment variable equivalent to this option, and no
-        facility for looking it up in <filename>.pgpass</filename>. It can be
-        used in a service file connection definition. Users with
-        more sophisticated uses should consider using openssl engines and
-        tools like PKCS#11 or USB crypto offload devices.
+        <itemizedlist>
+         <listitem>
+          <para>
+           <productname>OpenSSL</productname>: specifying this parameter with
+           any non-empty value suppresses the
+           <literal>Enter PEM pass phrase:</literal> prompt that
+           <productname>OpenSSL</productname> will emit by default when an
+           encrypted client certificate key is provided to
+           <literal>libpq</literal>.
+          </para>
+          <para>
+           If the key is not encrypted this parameter is ignored. The parameter
+           has no effect on keys specified by <productname>OpenSSL</productname>
+           engines unless the engine uses the <productname>OpenSSL</productname>
+           password callback mechanism for prompts.
+          </para>
+          <para>
+           There is no environment variable equivalent to this option, and no
+           facility for looking it up in <filename>.pgpass</filename>. It can be
+           used in a service file connection definition. Users with
+           more sophisticated uses should consider using
+           <productname>OpenSSL</productname> engines and tools like PKCS#11 or
+           USB crypto offload devices.
+          </para>
+         </listitem>
+
+         <listitem>
+          <para>
+           <productname>NSS</productname>: specifying the parameter is required
+           in case any password protected items are referenced in the
+           <productname>NSS</productname> database, or if the database itself
+           is password protected.  If multiple different objects are password
+           protected, the same password is used for all.
+          </para>
+         </listitem>
+        </itemizedlist>
        </para>
       </listitem>
      </varlistentry>
@@ -1707,11 +1832,27 @@ postgresql://%2Fvar%2Flib%2Fpostgresql/dbname
       <term><literal>sslrootcert</literal></term>
       <listitem>
        <para>
-        This parameter specifies the name of a file containing SSL
-        certificate authority (<acronym>CA</acronym>) certificate(s).
-        If the file exists, the server's certificate will be verified
-        to be signed by one of these authorities.  The default is
-        <filename>~/.postgresql/root.crt</filename>.
+        This parameter specifies the name of SSL certificate authority
+        (<acronym>CA</acronym>) certificate(s).
+        <itemizedlist>
+         <listitem>
+          <para>
+           <productname>OpenSSL</productname>: specifies the name of a file
+           containing SSL certificate authority (<acronym>CA</acronym>)
+           certificate(s).  If the file exists, the server's certificate will
+           be verified to be signed by one of these authorities.  The default is
+           <filename>~/.postgresql/root.crt</filename>.
+          </para>
+         </listitem>
+
+         <listitem>
+          <para>
+           <productname>NSS</productname>: this parameter has no effect.  CA
+           certificates should be loaded into the <productname>NSS</productname>
+           database using the <application>certutil</application> tool.
+          </para>
+         </listitem>
+        </itemizedlist>
        </para>
       </listitem>
      </varlistentry>
@@ -1721,10 +1862,27 @@ postgresql://%2Fvar%2Flib%2Fpostgresql/dbname
       <listitem>
        <para>
         This parameter specifies the file name of the SSL certificate
-        revocation list (CRL).  Certificates listed in this file, if it
-        exists, will be rejected while attempting to authenticate the
-        server's certificate.  The default is
-        <filename>~/.postgresql/root.crl</filename>.
+        revocation list (CRL).  
+
+        <itemizedlist>
+         <listitem>
+          <para>
+           <productname>OpenSSL</productname>: Certificates listed in this file,
+           if it exists, will be rejected while attempting to authenticate the
+           server's certificate.  The default is
+           <filename>~/.postgresql/root.crl</filename>.
+          </para>
+         </listitem>
+
+         <listitem>
+          <para>
+           <productname>NSS</productname>: This parameter has no effect.  CRL
+           files should be loaded into the <productname>NSS</productname>
+           database using the <application>crlutil</application> tool.
+          </para>
+         </listitem>
+        </itemizedlist>
+
        </para>
       </listitem>
      </varlistentry>
@@ -1760,8 +1918,8 @@ postgresql://%2Fvar%2Flib%2Fpostgresql/dbname
         for the connection. Valid values are <literal>TLSv1</literal>,
         <literal>TLSv1.1</literal>, <literal>TLSv1.2</literal> and
         <literal>TLSv1.3</literal>. The supported protocols depend on the
-        version of <productname>OpenSSL</productname> used, older versions
-        not supporting the most modern protocol versions. If not specified,
+        version of the SSL library used, older versions may 
+        not support the most modern protocol versions. If not specified,
         the default is <literal>TLSv1.2</literal>, which satisfies industry
         best practices as of this writing.
        </para>
@@ -1776,8 +1934,8 @@ postgresql://%2Fvar%2Flib%2Fpostgresql/dbname
         for the connection. Valid values are <literal>TLSv1</literal>,
         <literal>TLSv1.1</literal>, <literal>TLSv1.2</literal> and
         <literal>TLSv1.3</literal>. The supported protocols depend on the
-        version of <productname>OpenSSL</productname> used, older versions
-        not supporting the most modern protocol versions. If not set, this
+        version of the SSL library used, older versions
+        may not support the most modern protocol versions. If not set, this
         parameter is ignored and the connection will use the maximum bound
         defined by the backend, if set. Setting the maximum protocol version
         is mainly useful for testing or if some component has issues working
@@ -2497,6 +2655,8 @@ void *PQsslStruct(const PGconn *conn, const char *struct_name);
       </para>
       <para>
        The struct(s) available depend on the SSL implementation in use.
+      </para>
+      <para>
        For <productname>OpenSSL</productname>, there is one struct,
        available under the name "OpenSSL", and it returns a pointer to the
        <productname>OpenSSL</productname> <literal>SSL</literal> struct.
@@ -2520,9 +2680,14 @@ void *PQsslStruct(const PGconn *conn, const char *struct_name);
 ]]></programlisting>
       </para>
       <para>
-       This structure can be used to verify encryption levels, check server
-       certificates, and more. Refer to the <productname>OpenSSL</productname>
-       documentation for information about this structure.
+       For <productname>NSS</productname>, there is one struct available under
+       the name "NSS", and it returns a pointer to the
+       <productname>NSS</productname> <literal>PRFileDesc</literal>.
+      </para>
+      <para>
+       These structures can be used to verify encryption levels, check server
+       certificates, and more. Refer to the <acronym>SSL</acronym> library
+       documentation for information about these structures.
       </para>
      </listitem>
     </varlistentry>
@@ -2549,6 +2714,10 @@ void *PQgetssl(const PGconn *conn);
        <xref linkend="libpq-PQsslInUse"/> instead, and for more details about the
        connection, use <xref linkend="libpq-PQsslAttribute"/>.
       </para>
+      <para>
+       This function returns <literal>NULL</literal> when <acronym>SSL</acronym>
+       librariaes other than <productname>OpenSSL</productname> are used.
+      </para>
      </listitem>
     </varlistentry>
 
@@ -7982,6 +8151,11 @@ void PQinitOpenSSL(int do_ssl, int do_crypto);
        before first opening a database connection.  Also be sure that you
        have done that initialization before opening a database connection.
       </para>
+
+      <para>
+       This function does nothing when using <productname>NSS</productname> as
+       the <acronym>SSL</acronym> library.
+      </para>
      </listitem>
     </varlistentry>
 
@@ -8008,6 +8182,11 @@ void PQinitSSL(int do_ssl);
        might be preferable for applications that need to work with older
        versions of <application>libpq</application>.
       </para>
+
+      <para>
+       This function does nothing when using <productname>NSS</productname> as
+       the <acronym>SSL</acronym> library.
+      </para>
      </listitem>
     </varlistentry>
    </variablelist>
diff --git a/doc/src/sgml/runtime.sgml b/doc/src/sgml/runtime.sgml
index bf877c0e0c..1fcad17a51 100644
--- a/doc/src/sgml/runtime.sgml
+++ b/doc/src/sgml/runtime.sgml
@@ -2185,15 +2185,21 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
 
   <indexterm zone="ssl-tcp">
    <primary>SSL</primary>
+   <secondary>TLS</secondary>
   </indexterm>
 
   <para>
    <productname>PostgreSQL</productname> has native support for using
    <acronym>SSL</acronym> connections to encrypt client/server communications
    for increased security. This requires that
-   <productname>OpenSSL</productname> is installed on both client and
+   a supported TLS library is installed on both client and
    server systems and that support in <productname>PostgreSQL</productname> is
    enabled at build time (see <xref linkend="installation"/>).
+   Supported libraries are <productname>OpenSSL</productname> and
+   <productname>NSS</productname>. The terms <acronym>SSL</acronym> and
+   <acronym>TLS</acronym> are often used interchangeably to mean a secure
+   connection using a <acronym>TLS</acronym> protocol, even though
+   <acronym>SSL</acronym> protocols are no longer supported.
   </para>
 
   <sect2 id="ssl-setup">
@@ -2213,8 +2219,13 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
   </para>
 
   <para>
-   To start in <acronym>SSL</acronym> mode, files containing the server certificate
-   and private key must exist.  By default, these files are expected to be
+   To start in <acronym>SSL</acronym> mode, a server certificate
+   and private key must exist. The below sections on the different libraries
+   will discuss how to configure these.
+  </para>
+   
+  <para>
+   By default, these files are expected to be
    named <filename>server.crt</filename> and <filename>server.key</filename>, respectively, in
    the server's data directory, but other names and locations can be specified
    using the configuration parameters <xref linkend="guc-ssl-cert-file"/>
@@ -2304,6 +2315,18 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
   </note>
   </sect2>
 
+  <sect2 id="ssl-nss-config">
+   <title>NSS Configuration</title>
+
+  <para>
+   <productname>PostgreSQL</productname> will look for certificates and keys
+   in the <productname>NSS</productname> database specified by the parameter
+   <xref linkend="guc-ssl-database"/> in <filename>postgresql.conf</filename>.
+   The parameters for certificate and key filenames are used to identify the
+   nicknames in the database.
+  </para>
+  </sect2>
+
   <sect2 id="ssl-client-certificates">
    <title>Using Client Certificates</title>
 
@@ -2378,7 +2401,7 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
   </sect2>
 
   <sect2 id="ssl-server-files">
-   <title>SSL Server File Usage</title>
+   <title>SSL Server File Parameter Usage</title>
 
    <para>
     <xref linkend="ssl-file-usage"/> summarizes the files that are
@@ -2425,6 +2448,14 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
       <entry>client certificate must not be on this list</entry>
      </row>
 
+     <row>
+      <entry><xref linkend="guc-ssl-database"/></entry>
+      <entry>certificate database</entry>
+      <entry>contains server certificates, keys and revocation lists; only
+      used when <productname>PostgreSQL</productname> is built with support
+      for <productname>NSS</productname>.</entry>
+     </row>
+
     </tbody>
    </tgroup>
   </table>
@@ -2448,7 +2479,7 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
   </sect2>
 
   <sect2 id="ssl-certificate-creation">
-   <title>Creating Certificates</title>
+   <title>Creating Certificates with OpenSSL</title>
 
    <para>
      To create a simple self-signed certificate for the server, valid for 365
@@ -2552,6 +2583,89 @@ openssl x509 -req -in server.csr -text -days 365 \
    </para>
   </sect2>
 
+  <sect2 id="nss-certificate-database">
+   <title>NSS Certificate Databases</title>
+
+   <para>
+    When using <productname>NSS</productname>, all certificates and keys must
+    be loaded into an <productname>NSS</productname> certificate database.
+   </para>
+
+   <para>
+    To create a new <productname>NSS</productname> certificate database and
+    load the certificates created in <xref linkend="ssl-certificate-creation" />,
+    use the following <productname>NSS</productname> commands:
+<programlisting>
+certutil -d "sql:server.db" -N --empty-password
+certutil -d "sql:server.db" -A -n server.crt -i server.crt -t "CT,C,C"
+certutil -d "sql:server.db" -A -n root.crt -i root.crt -t "CT,C,C"
+</programlisting>
+    This will give the certificate the filename as the nickname identifier in
+    the database which is created as <filename>server.db</filename>.
+   </para>
+   <para>
+    Then load the server key, which require converting it to
+    <acronym>PKCS#12</acronym> format using the
+    <productname>OpenSSL</productname> tools:
+<programlisting>
+openssl pkcs12 -export -out server.pfx -inkey server.key -in server.crt \
+  -certfile root.crt -passout pass:
+pk12util -i server.pfx -d server.db -W ''
+</programlisting>
+   </para>
+   <para>
+    Finally a certificate revocation list can be loaded with the following
+    commands:
+<programlisting>
+crlutil -I -i server.crl -d server.db -B
+</programlisting>
+   </para>
+  </sect2>
+
+  <sect2 id="nss-ssl-certificate-creation">
+   <title>Creating Certificates with NSS</title>
+
+   <para>
+    To create a simple self-signed CA and certificate for the server, use the
+    following NSS commands. Replace
+    <replaceable>*.yourdomain.com</replaceable> with the server's host
+    name. Remove <replaceable>--empty-password</replaceable> in order to set
+    a password protecting the databases. The password can be passed to
+    <application>certutil</application> with the <literal>-f</literal> parameter.
+    First create a self-signed CA. To use a different certificate validity
+    time than the default, use <replaceable>-v</replaceable> to specify the
+    number of months of validity.
+<programlisting>
+mkdir root_ca.db
+certutil -N -d "sql:root_ca.db/" --empty-password
+certutil -S -d "sql:root_ca.db/" -n root_ca -s "CN=<replaceable>ca.yourdomain.com</replaceable>" \
+  -x -k rsa -g 2048 -m <replaceable>5432</replaceable> -t CTu,CTu,CTu \
+  --keyUsage certSigning -2 --nsCertType sslCA,smimeCA,objectSigningCA \
+  -Z SHA256
+certutil -L -d "sql:root_ca.db/" -n root_ca -a > root_ca.pem
+</programlisting>
+    Now create a server certificate database, and create a certificate signing
+    request for the CA. Then sign the request with the already created CA and
+    insert the certificate chain into the certificate database.
+<programlisting>
+mkdir server_cert.db
+certutil -N -d "sql:server_cert.db/" --empty-password
+certutil -R -d "sql:server_cert.db/" -s "CN=dbhost.yourdomain.com" \
+  -o server_cert.csr -g 2048 -Z SHA256
+
+certutil -C -d "sql:root_ca.db/" -c root_ca -i server_cert.csr \
+  -o server_cert.der -m <replaceable>5433</replaceable> \
+  --keyUsage keyEncipherment,dataEncipherment,digitalSignature \
+  --nsCertType sslServer -Z SHA256
+
+certutil -A -d "sql:server_cert.db/" -n root_ca -t CTu,CTu,CTu -a -i root_ca.pem
+certutil -A -d "sql:server_cert.db/" -n server_cert -t CTu,CTu,CTu -i server_cert.der
+</programlisting>
+    The server certificate is loaded into the certificate database as well as
+    the CA certificate in order to provide the chain of certificates.
+   </para>
+  </sect2>
+
  </sect1>
 
  <sect1 id="gssapi-enc">
-- 
2.21.1 (Apple Git-122.3)

From 264af1bd9e574032c13d17edc9c46de16bcb3f8e Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Mon, 8 Feb 2021 23:52:39 +0100
Subject: [PATCH v27 4/9] nss: pg_strong_random support

This adds support for using the RNG in libnss as a backend for
pg_strong_random.
---
 src/port/pg_strong_random.c | 50 ++++++++++++++++++++++++++++++++++++-
 1 file changed, 49 insertions(+), 1 deletion(-)

diff --git a/src/port/pg_strong_random.c b/src/port/pg_strong_random.c
index 07f24c0089..40de237628 100644
--- a/src/port/pg_strong_random.c
+++ b/src/port/pg_strong_random.c
@@ -137,7 +137,55 @@ pg_strong_random(void *buf, size_t len)
 	return false;
 }
 
-#else							/* not USE_OPENSSL or WIN32 */
+#elif defined(USE_NSS)
+
+#define pg_BITS_PER_BYTE BITS_PER_BYTE
+#undef BITS_PER_BYTE
+#define NO_NSPR_10_SUPPORT
+#include <nss/nss.h>
+#include <nss/pk11pub.h>
+#if defined(BITS_PER_BYTE)
+#if BITS_PER_BYTE != pg_BITS_PER_BYTE
+#error "incompatible byte widths between NSPR and postgres"
+#endif
+#else
+#define BITS_PER_BYTE pg_BITS_PER_BYTE
+#endif
+#undef pg_BITS_PER_BYTE
+
+void
+pg_strong_random_init(void)
+{
+	/* No initialization needed on NSS */
+}
+
+bool
+pg_strong_random(void *buf, size_t len)
+{
+	NSSInitParameters params;
+	NSSInitContext *nss_context;
+	SECStatus	status;
+
+	memset(&params, 0, sizeof(params));
+	params.length = sizeof(params);
+	nss_context = NSS_InitContext("", "", "", "", &params,
+								  NSS_INIT_READONLY | NSS_INIT_NOCERTDB |
+								  NSS_INIT_NOMODDB | NSS_INIT_FORCEOPEN |
+								  NSS_INIT_NOROOTINIT | NSS_INIT_PK11RELOAD);
+
+	if (!nss_context)
+		return false;
+
+	status = PK11_GenerateRandom(buf, len);
+	NSS_ShutdownContext(nss_context);
+
+	if (status == SECSuccess)
+		return true;
+
+	return false;
+}
+
+#else							/* not USE_OPENSSL, USE_NSS or WIN32 */
 
 /*
  * Without OpenSSL or Win32 support, just read /dev/urandom ourselves.
-- 
2.21.1 (Apple Git-122.3)

From 4c5abf24bd4b357f6167179882ad401aae6614f8 Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Mon, 8 Feb 2021 23:52:37 +0100
Subject: [PATCH v27 3/9] nss: Add NSS specific tests

This adds the SSL/Backend/NSS which implements the setup and teardown
required as well as adds the NSS configuration to the existing tests.

The OpenSSL testfiles are reused by repackaging them into NSS databases
in order for the tests to be cross-library. Additional testfiles are
generated by using only the NSS toolchain as well as rudimentary tests
using these.
---
 src/test/ssl/Makefile             | 225 +++++++++++++++++++++++
 src/test/ssl/t/001_ssltests.pl    | 296 ++++++++++++++++++++----------
 src/test/ssl/t/002_scram.pl       |  29 ++-
 src/test/ssl/t/SSL/Backend/NSS.pm |  73 ++++++++
 4 files changed, 523 insertions(+), 100 deletions(-)
 create mode 100644 src/test/ssl/t/SSL/Backend/NSS.pm

diff --git a/src/test/ssl/Makefile b/src/test/ssl/Makefile
index d545382eea..6966dc23d2 100644
--- a/src/test/ssl/Makefile
+++ b/src/test/ssl/Makefile
@@ -30,6 +30,35 @@ SSLFILES := $(CERTIFICATES:%=ssl/%.key) $(CERTIFICATES:%=ssl/%.crt) \
 	ssl/client+client_ca.crt ssl/client-der.key \
 	ssl/client-encrypted-pem.key ssl/client-encrypted-der.key
 
+# Even though we in practice could get away with far fewer NSS databases, they
+# are generated to mimic the setup for the OpenSSL tests in order to ensure
+# we isolate the same behavior between the backends. The database name should
+# contain the files included for easier test suite code reading.
+NSSFILES := ssl/nss/client_ca.crt.db \
+	ssl/nss/server_ca.crt.db \
+	ssl/nss/root+server_ca.crt.db \
+	ssl/nss/root+client_ca.crt.db \
+	ssl/nss/client.crt__client.key.db \
+	ssl/nss/client-revoked.crt__client-revoked.key.db \
+	ssl/nss/server-cn-only.crt__server-password.key.db \
+	ssl/nss/server-cn-only.crt__server-cn-only.key.db \
+	ssl/nss/root.crl \
+	ssl/nss/server.crl \
+	ssl/nss/client.crl \
+	ssl/nss/server-multiple-alt-names.crt__server-multiple-alt-names.key.db \
+	ssl/nss/server-single-alt-name.crt__server-single-alt-name.key.db \
+	ssl/nss/server-cn-and-alt-names.crt__server-cn-and-alt-names.key.db \
+	ssl/nss/server-no-names.crt__server-no-names.key.db \
+	ssl/nss/server-revoked.crt__server-revoked.key.db \
+	ssl/nss/root+client.crl \
+	ssl/nss/client+client_ca.crt__client.key.db \
+	ssl/nss/client.crt__client-encrypted-pem.key.db \
+	ssl/nss/root+server_ca.crt__server.crl.db \
+	ssl/nss/root+server_ca.crt__root+server.crl.db \
+	ssl/nss/native_ca-root.db \
+	ssl/nss/native_server-root.db \
+	ssl/nss/native_client-root.db
+
 # This target re-generates all the key and certificate files. Usually we just
 # use the ones that are committed to the tree without rebuilding them.
 #
@@ -37,6 +66,10 @@ SSLFILES := $(CERTIFICATES:%=ssl/%.key) $(CERTIFICATES:%=ssl/%.crt) \
 #
 sslfiles: $(SSLFILES)
 
+# Generate NSS certificate databases corresponding to the OpenSSL certificates.
+# This target will fail unless preceded by nssfiles-clean.
+nssfiles: $(NSSFILES)
+
 # OpenSSL requires a directory to put all generated certificates in. We don't
 # use this for anything, but we need a location.
 ssl/new_certs_dir:
@@ -64,6 +97,24 @@ ssl/%_ca.crt: ssl/%_ca.key %_ca.config ssl/root_ca.crt ssl/new_certs_dir
 	rm ssl/temp_ca.crt ssl/temp_ca_signed.crt
 	echo "01" > ssl/$*_ca.srl
 
+ssl/nss/%_ca.crt.db: ssl/%_ca.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n $*_ca.crt -i ssl/$*_ca.crt -t "CT,C,C"
+
+ssl/nss/root+server_ca.crt__server.crl.db: ssl/root+server_ca.crt ssl/nss/server.crl
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	crlutil -I -i ssl/nss/server.crl -d $@ -B
+
+ssl/nss/root+server_ca.crt__root+server.crl.db: ssl/root+server_ca.crt ssl/nss/root.crl ssl/nss/server.crl
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	crlutil -I -i ssl/nss/root.crl -d $@ -B
+	crlutil -I -i ssl/nss/server.crl -d $@ -B
+
 # Server certificates, signed by server CA:
 ssl/server-%.crt: ssl/server-%.key ssl/server_ca.crt server-%.config
 	openssl req -new -key ssl/server-$*.key -out ssl/server-$*.csr -config server-$*.config
@@ -77,6 +128,79 @@ ssl/server-ss.crt: ssl/server-cn-only.key ssl/server-cn-only.crt server-cn-only.
 	openssl x509 -req -days 10000 -in ssl/server-ss.csr -signkey ssl/server-cn-only.key -out ssl/server-ss.crt  -extensions v3_req -extfile server-cn-only.config
 	rm ssl/server-ss.csr
 
+# pk12util won't preserve the password when importing the password protected
+# key, the password must be set on the database *before* importing it as the
+# password in the pkcs12 envelope will be dropped.
+ssl/nss/server-cn-only.crt__server-password.key.db: ssl/server-cn-only.crt
+	$(MKDIR_P) $@
+	echo "secret1" > password.txt
+	certutil -d "sql:$@" -N -f password.txt
+	certutil -d "sql:$@" -A -n ssl/server-cn-only.crt -i ssl/server-cn-only.crt -t "CT,C,C" -f password.txt
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C" -f password.txt
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C" -f password.txt
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C" -f password.txt
+	openssl pkcs12 -export -out ssl/nss/server-password.pfx -inkey ssl/server-password.key -in ssl/server-cn-only.crt -certfile ssl/server_ca.crt -passin 'pass:secret1' -passout 'pass:secret1'
+	pk12util -i ssl/nss/server-password.pfx -d "sql:$@" -W 'secret1' -K 'secret1'
+
+ssl/nss/server-cn-only.crt__server-cn-only.key.db: ssl/server-cn-only.crt ssl/server-cn-only.key
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-cn-only.crt -i ssl/server-cn-only.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-cn-only.pfx -inkey ssl/server-cn-only.key -in ssl/server-cn-only.crt -certfile ssl/server_ca.crt -passout pass:
+	pk12util -i ssl/nss/server-cn-only.pfx -d "sql:$@" -W ''
+
+ssl/nss/server-multiple-alt-names.crt__server-multiple-alt-names.key.db: ssl/server-multiple-alt-names.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-multiple-alt-names.crt -i ssl/server-multiple-alt-names.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-multiple-alt-names.pfx -inkey ssl/server-multiple-alt-names.key -in ssl/server-multiple-alt-names.crt -certfile ssl/server-multiple-alt-names.crt -passout pass:
+	pk12util -i ssl/nss/server-multiple-alt-names.pfx -d "sql:$@" -W ''
+
+ssl/nss/server-single-alt-name.crt__server-single-alt-name.key.db: ssl/server-single-alt-name.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-single-alt-name.crt -i ssl/server-single-alt-name.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-single-alt-name.pfx -inkey ssl/server-single-alt-name.key -in ssl/server-single-alt-name.crt -certfile ssl/server-single-alt-name.crt -passout pass:
+	pk12util -i ssl/nss/server-single-alt-name.pfx -d "sql:$@" -W ''
+
+ssl/nss/server-cn-and-alt-names.crt__server-cn-and-alt-names.key.db: ssl/server-cn-and-alt-names.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-cn-and-alt-names.crt -i ssl/server-cn-and-alt-names.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-cn-and-alt-names.pfx -inkey ssl/server-cn-and-alt-names.key -in ssl/server-cn-and-alt-names.crt -certfile ssl/server-cn-and-alt-names.crt -passout pass:
+	pk12util -i ssl/nss/server-cn-and-alt-names.pfx -d $@ -W ''
+
+ssl/nss/server-no-names.crt__server-no-names.key.db: ssl/server-no-names.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-no-names.crt -i ssl/server-no-names.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-no-names.pfx -inkey ssl/server-no-names.key -in ssl/server-no-names.crt -certfile ssl/server-no-names.crt -passout pass:
+	pk12util -i ssl/nss/server-no-names.pfx -d "sql:$@" -W ''
+
+ssl/nss/server-revoked.crt__server-revoked.key.db: ssl/server-revoked.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-revoked.crt -i ssl/server-revoked.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-revoked.pfx -inkey ssl/server-revoked.key -in ssl/server-revoked.crt -certfile ssl/server-revoked.crt -passout pass:
+	pk12util -i ssl/nss/server-revoked.pfx -d "sql:$@" -W ''
+
 # Password-protected version of server-cn-only.key
 ssl/server-password.key: ssl/server-cn-only.key
 	openssl rsa -aes256 -in $< -out $@ -passout 'pass:secret1'
@@ -88,6 +212,27 @@ ssl/client.crt: ssl/client.key ssl/client_ca.crt
 	openssl x509 -in ssl/temp.crt -out ssl/client.crt # to keep just the PEM cert
 	rm ssl/client.csr ssl/temp.crt
 
+# Client certificate, signed by client CA
+ssl/nss/client.crt__client.key.db: ssl/client.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/client.crt -i ssl/client.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root+client_ca.crt -i ssl/root+client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client.pfx -inkey ssl/client.key -in ssl/client.crt -certfile ssl/client_ca.crt -passout pass:
+	pk12util -i ssl/nss/client.pfx -d "sql:$@" -W ''
+
+# Client certificate with encrypted key, signed by client CA
+ssl/nss/client.crt__client-encrypted-pem.key.db: ssl/client.crt
+	$(MKDIR_P) $@
+	echo 'dUmmyP^#+' > $@.pass
+	certutil -d "sql:$@" -N -f $@.pass
+	certutil -d "sql:$@" -A -f $@.pass -n ssl/client.crt -i ssl/client.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -f $@.pass -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -f $@.pass -n root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client-encrypted-pem.pfx -inkey ssl/client-encrypted-pem.key -in ssl/client.crt -certfile ssl/client_ca.crt -passin pass:'dUmmyP^#+' -passout pass:'dUmmyP^#+'
+	pk12util -i ssl/nss/client-encrypted-pem.pfx -d "sql:$@" -W 'dUmmyP^#+' -k $@.pass
+
 # Another client certificate, signed by the client CA. This one is revoked.
 ssl/client-revoked.crt: ssl/client-revoked.key ssl/client_ca.crt client.config
 	openssl req -new -key ssl/client-revoked.key -out ssl/client-revoked.csr -config client.config
@@ -95,6 +240,14 @@ ssl/client-revoked.crt: ssl/client-revoked.key ssl/client_ca.crt client.config
 	openssl x509 -in ssl/temp.crt -out ssl/client-revoked.crt # to keep just the PEM cert
 	rm ssl/client-revoked.csr ssl/temp.crt
 
+ssl/nss/client-revoked.crt__client-revoked.key.db: ssl/client-revoked.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/client-revoked.crt -i ssl/client-revoked.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client-revoked.pfx -inkey ssl/client-revoked.key -in ssl/client-revoked.crt -certfile ssl/client_ca.crt -passout pass:
+	pk12util -i ssl/nss/client-revoked.pfx -d "sql:$@" -W ''
+
 # Convert the key to DER, to test our behaviour there too
 ssl/client-der.key: ssl/client.key
 	openssl rsa -in ssl/client.key -outform DER -out ssl/client-der.key
@@ -127,19 +280,40 @@ ssl/root+client_ca.crt: ssl/root_ca.crt ssl/client_ca.crt
 ssl/client+client_ca.crt: ssl/client.crt ssl/client_ca.crt
 	cat $^ > $@
 
+# Client certificate, signed by client CA
+ssl/nss/client+client_ca.crt__client.key.db: ssl/client+client_ca.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/client+client_ca.crt -i ssl/client+client_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n ssl/root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client.pfx -inkey ssl/client.key -in ssl/client.crt -certfile ssl/client_ca.crt -passout pass:
+	pk12util -i ssl/nss/client.pfx -d "sql:$@" -W ''
+
 #### CRLs
 
 ssl/client.crl: ssl/client-revoked.crt
 	openssl ca -config cas.config -name client_ca -revoke ssl/client-revoked.crt
 	openssl ca -config cas.config -name client_ca -gencrl -out ssl/client.crl
 
+ssl/nss/client.crl: ssl/client.crl
+	openssl crl -in $^ -outform der -out $@
+
 ssl/server.crl: ssl/server-revoked.crt
 	openssl ca -config cas.config -name server_ca -revoke ssl/server-revoked.crt
 	openssl ca -config cas.config -name server_ca -gencrl -out ssl/server.crl
 
+ssl/nss/server.crl: ssl/server.crl
+	openssl crl -in $^ -outform der -out $@
+
 ssl/root.crl: ssl/root_ca.crt
 	openssl ca -config cas.config -name root_ca -gencrl -out ssl/root.crl
 
+ssl/nss/root.crl: ssl/root.crl
+	openssl crl -in $^ -outform der -out $@
+
+ssl/nss/root+client.crl: ssl/root+client.crl
+	openssl crl -in $^ -outform der -out $@
+
 # If a CRL is used, OpenSSL requires a CRL file for *all* the CAs in the
 # chain, even if some of them are empty.
 ssl/root+server.crl: ssl/root.crl ssl/server.crl
@@ -147,13 +321,64 @@ ssl/root+server.crl: ssl/root.crl ssl/server.crl
 ssl/root+client.crl: ssl/root.crl ssl/client.crl
 	cat $^ > $@
 
+#### NSS specific certificates and keys
+
+ssl/nss/native_ca-%.db:
+	$(MKDIR_P) ssl/nss/native_ca-$*.db
+	certutil -N -d "sql:ssl/nss/native_ca-$*.db/" --empty-password
+	echo y > nss_ca_params.txt
+	echo 10 >> nss_ca_params.txt
+	echo y >> nss_ca_params.txt
+	cat nss_ca_params.txt | certutil -S -d "sql:ssl/nss/native_ca-$*.db/" -n ca-$* \
+	-s "CN=Test CA for PostgreSQL SSL regression tests,OU=PostgreSQL test suite" \
+	-x -k rsa -g 2048 -m 5432 -t CTu,CTu,CTu \
+	--keyUsage certSigning -2 --nsCertType sslCA,smimeCA,objectSigningCA \
+	-z Makefile -Z SHA256
+	rm nss_ca_params.txt
+
+ssl/nss/native_ca-%.pem: ssl/nss/native_ca-%.db
+	certutil -L -d "sql:ssl/nss/native_ca-$*.db/" -n ca-$* -a > ssl/nss/native_ca-$*.pem
+
+# Create and sign a server certificate
+ssl/nss/native_server-%.db: ssl/nss/native_ca-%.pem
+	$(MKDIR_P) ssl/nss/native_server-$*.db
+	certutil -N -d "sql:ssl/nss/native_server-$*.db/" --empty-password
+	certutil -R -d "sql:ssl/nss/native_server-$*.db/" \
+		-s "CN=common-name.pg-ssltest.test,OU=PostgreSQL test suite" \
+		-o ssl/nss/native_server-$*.csr -g 2048 -Z SHA256 -z Makefile
+	echo 1 > nss_server_params.txt
+	echo 9 >> nss_server_params.txt
+	cat nss_server_params.txt | certutil -C -d "sql:ssl/nss/native_ca-$*.db/" -c ca-root -i ssl/nss/native_server-$*.csr \
+		-o ssl/nss/native_server_$*.der -m 5433 --keyUsage dataEncipherment,digitalSignature,keyEncipherment \
+		--nsCertType sslServer --certVersion 1 -Z SHA256
+	certutil -A -d "sql:ssl/nss/native_server-$*.db/" -n ca-$* -t CTu,CTu,CTu -a -i ssl/nss/native_ca-$*.pem
+	certutil -A -d "sql:ssl/nss/native_server-$*.db/" -n ssl/native_server-$*.crt -t CTu,CTu,CTu -i ssl/nss/native_server_$*.der
+	rm nss_server_params.txt
+
+# Create and sign a client certificate
+ssl/nss/native_client-%.db: ssl/nss/native_ca-%.pem
+	$(MKDIR_P) ssl/nss/native_client-$*.db
+	certutil -N -d "sql:ssl/nss/native_client-$*.db/" --empty-password
+	certutil -R -d "sql:ssl/nss/native_client-$*.db/" -s "CN=ssltestuser,OU=PostgreSQL test suite" \
+		-o ssl/nss/native_client-$*.csr -g 2048 -Z SHA256 -z Makefile
+	certutil -C -d "sql:ssl/nss/native_ca-$*.db/" -c ca-$* -i ssl/nss/native_client-$*.csr -o ssl/nss/native_client-$*.der \
+		-m 5434 --keyUsage keyEncipherment,dataEncipherment,digitalSignature --nsCertType sslClient \
+		--certVersion 1 -Z SHA256
+	certutil -A -d "sql:ssl/nss/native_client-$*.db" -n ca-$* -t CTu,CTu,CTu -a -i ssl/nss/native_ca-$*.pem
+	certutil -A -d "sql:ssl/nss/native_client-$*.db" -n native_client-$* -t CTu,CTu,CTu -i ssl/nss/native_client-$*.der
+
 .PHONY: sslfiles-clean
 sslfiles-clean:
 	rm -f $(SSLFILES) ssl/client_ca.srl ssl/server_ca.srl ssl/client_ca-certindex* ssl/server_ca-certindex* ssl/root_ca-certindex* ssl/root_ca.srl ssl/temp_ca.crt ssl/temp_ca_signed.crt
 
+.PHONY: nssfiles-clean
+nssfiles-clean:
+	rm -rf ssl/nss
+
 clean distclean maintainer-clean:
 	rm -rf tmp_check
 	rm -rf ssl/*.old ssl/new_certs_dir ssl/client*_tmp.key
+	rm -rf ssl/nss
 
 # Doesn't depend on $(SSLFILES) because we don't rebuild them by default
 check:
diff --git a/src/test/ssl/t/001_ssltests.pl b/src/test/ssl/t/001_ssltests.pl
index a6d79e2bfc..394505dd8b 100644
--- a/src/test/ssl/t/001_ssltests.pl
+++ b/src/test/ssl/t/001_ssltests.pl
@@ -9,7 +9,20 @@ use lib $FindBin::RealBin;
 
 use SSL::Server;
 
-if ($ENV{with_ssl} ne 'openssl')
+my $openssl;
+my $nss;
+
+if ($ENV{with_ssl} eq 'openssl')
+{
+	$openssl = 1;
+	plan tests => 93;
+}
+elsif ($ENV{with_ssl} eq 'nss')
+{
+	$nss = 1;
+	plan tests => 99;
+}
+else
 {
 	plan skip_all => 'SSL not supported by this build';
 }
@@ -47,19 +60,58 @@ configure_test_server_for_ssl($node, $SERVERHOSTADDR, $SERVERHOSTCIDR,
 
 note "testing password-protected keys";
 
-set_server_cert($node, 'server-cn-only', 'root+client_ca',
-				   'server-password', 'echo wrongpassword');
-command_fails(
-	[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
-	'restart fails with password-protected key file with wrong password');
-$node->_update_pid(0);
+# Since the passphrase callbacks operate at different stages in OpenSSL and
+# NSS we have two separate blocks for them
+SKIP:
+{
+	skip "Certificate passphrases aren't checked on server restart in NSS", 2
+	  if ($nss);
+
+	set_server_cert($node, 'server-cn-only', 'root+client_ca',
+					   'server-password', 'echo wrongpassword');
+	command_fails(
+		[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
+		'restart fails with password-protected key file with wrong password');
+	$node->_update_pid(0);
+
+	set_server_cert($node, 'server-cn-only', 'root+client_ca',
+					'server-password', 'echo secret1');
+	command_ok(
+		[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
+		'restart succeeds with password-protected key file');
+	$node->_update_pid(1);
+}
 
-set_server_cert($node, 'server-cn-only', 'root+client_ca',
-				'server-password', 'echo secret1');
-command_ok(
-	[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
-	'restart succeeds with password-protected key file');
-$node->_update_pid(1);
+SKIP:
+{
+	skip "Certificate passphrases are checked on connection in NSS", 5
+	  if ($openssl);
+
+	set_server_cert($node, 'server-cn-only', 'root+client_ca',
+					   'server-password', 'echo wrongpassword');
+	command_ok(
+		[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
+		'restart fails with password-protected key file with wrong password');
+	$node->_update_pid(1);
+
+	test_connect_fails(
+		"user=ssltestuser dbname=trustdb sslcert=invalid hostaddr=$SERVERHOSTADDR host=common-name.pg-ssltest.test",
+		"sslrootcert=invalid sslmode=require",
+		qr/\QSSL error\E/,
+		"connect to server with incorrect key password configured");
+
+	set_server_cert($node, 'server-cn-only', 'root+client_ca',
+					   'server-password', 'echo secret1');
+	command_ok(
+		[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
+		'restart fails with password-protected key file with wrong password');
+	$node->_update_pid(1);
+
+	test_connect_ok(
+		"user=ssltestuser dbname=trustdb sslcert=invalid hostaddr=$SERVERHOSTADDR host=common-name.pg-ssltest.test",
+		"sslrootcert=invalid sslmode=require",
+		"connect to server with correct key password configured");
+}
 
 # Test compatibility of SSL protocols.
 # TLSv1.1 is lower than TLSv1.2, so it won't work.
@@ -107,82 +159,105 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"sslrootcert=invalid sslmode=verify-ca",
-	qr/root certificate file "invalid" does not exist/,
+	qr/root certificate file "invalid" does not exist|Peer's certificate issuer has been marked as not trusted by the user/,
 	"connect without server root cert sslmode=verify-ca");
 test_connect_fails(
 	$common_connstr,
 	"sslrootcert=invalid sslmode=verify-full",
-	qr/root certificate file "invalid" does not exist/,
+	qr/root certificate file "invalid" does not exist|Peer's certificate issuer has been marked as not trusted by the user/,
 	"connect without server root cert sslmode=verify-full");
 
 # Try with wrong root cert, should fail. (We're using the client CA as the
 # root, but the server's key is signed by the server CA.)
-test_connect_fails($common_connstr,
-	"sslrootcert=ssl/client_ca.crt sslmode=require",
-	qr/SSL error/, "connect with wrong server root cert sslmode=require");
-test_connect_fails($common_connstr,
-	"sslrootcert=ssl/client_ca.crt sslmode=verify-ca",
-	qr/SSL error/, "connect with wrong server root cert sslmode=verify-ca");
-test_connect_fails($common_connstr,
-	"sslrootcert=ssl/client_ca.crt sslmode=verify-full",
-	qr/SSL error/, "connect with wrong server root cert sslmode=verify-full");
-
-# Try with just the server CA's cert. This fails because the root file
-# must contain the whole chain up to the root CA.
-test_connect_fails($common_connstr,
-	"sslrootcert=ssl/server_ca.crt sslmode=verify-ca",
-	qr/SSL error/, "connect with server CA cert, without root CA");
+test_connect_fails(
+	$common_connstr,
+	"sslrootcert=ssl/client_ca.crt sslmode=require cert_database=ssl/nss/client_ca.crt.db",
+	qr/SSL error/,
+	"connect with wrong server root cert sslmode=require");
+test_connect_fails(
+	$common_connstr,
+	"sslrootcert=ssl/client_ca.crt sslmode=verify-ca cert_database=ssl/nss/client_ca.crt.db",
+	qr/SSL error/,
+	"connect with wrong server root cert sslmode=verify-ca");
+test_connect_fails(
+	$common_connstr,
+	"sslrootcert=ssl/client_ca.crt sslmode=verify-full cert_database=ssl/nss/client_ca.crt.db",
+	qr/SSL error/,
+	"connect with wrong server root cert sslmode=verify-full");
+
+SKIP:
+{
+	# NSS supports partial chain validation, so this test doesn't work there.
+	# This is similar to the OpenSSL option X509_V_FLAG_PARTIAL_CHAIN which
+	# we don't allow.
+	skip "NSS support partial chain validation", 2 if ($nss);
+	# Try with just the server CA's cert. This fails because the root file
+	# must contain the whole chain up to the root CA.
+	test_connect_fails($common_connstr,
+		"sslrootcert=ssl/server_ca.crt sslmode=verify-ca",
+		qr/SSL error/, "connect with server CA cert, without root CA");
+}
 
 # And finally, with the correct root cert.
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require cert_database=ssl/nss/root+server_ca.crt.db",
 	"connect with correct server CA cert file sslmode=require");
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca cert_database=ssl/nss/root+server_ca.crt.db",
 	"connect with correct server CA cert file sslmode=verify-ca");
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-full",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db",
 	"connect with correct server CA cert file sslmode=verify-full");
 
-# Test with cert root file that contains two certificates. The client should
-# be able to pick the right one, regardless of the order in the file.
-test_connect_ok(
-	$common_connstr,
-	"sslrootcert=ssl/both-cas-1.crt sslmode=verify-ca",
-	"cert root file that contains two certificates, order 1");
-test_connect_ok(
-	$common_connstr,
-	"sslrootcert=ssl/both-cas-2.crt sslmode=verify-ca",
-	"cert root file that contains two certificates, order 2");
+SKIP:
+{
+	skip "CA ordering is irrelevant in NSS databases", 2 if ($nss);
 
+	# Test with cert root file that contains two certificates. The client should
+	# be able to pick the right one, regardless of the order in the file.
+	test_connect_ok(
+		$common_connstr,
+		"sslrootcert=ssl/both-cas-1.crt sslmode=verify-ca",
+		"cert root file that contains two certificates, order 1");
+
+	# How about import the both-file into a database?
+	test_connect_ok(
+		$common_connstr,
+		"sslrootcert=ssl/both-cas-2.crt sslmode=verify-ca",
+		"cert root file that contains two certificates, order 2");
+}
 # CRL tests
 
 # Invalid CRL filename is the same as no CRL, succeeds
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=invalid",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=invalid cert_database=ssl/nss/root+server_ca.crt.db",
 	"sslcrl option with invalid file name");
 
-# A CRL belonging to a different CA is not accepted, fails
-test_connect_fails(
-	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/client.crl",
-	qr/SSL error/,
-	"CRL belonging to a different CA");
+SKIP:
+{
+	skip "CRL's are verified when adding to NSS database", 2 if ($nss);
+	# A CRL belonging to a different CA is not accepted, fails
+	test_connect_fails(
+		$common_connstr,
+		"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/client.crl",
+		qr/SSL error/,
+		"CRL belonging to a different CA");
+}
 
 # With the correct CRL, succeeds (this cert is not revoked)
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/root+server.crl",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/root+server.crl cert_database=ssl/nss/root+server_ca.crt__root+server.crl.db",
 	"CRL with a non-revoked cert");
 
 # Check that connecting with verify-full fails, when the hostname doesn't
 # match the hostname in the server's certificate.
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -195,14 +270,14 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"sslmode=verify-full host=wronghost.test",
-	qr/\Qserver certificate for "common-name.pg-ssltest.test" does not match host name "wronghost.test"\E/,
+	qr/\Qserver certificate for "common-name.pg-ssltest.test" does not match host name "wronghost.test"\E|requested domain name does not match the server's certificate/,
 	"mismatch between host name and server certificate sslmode=verify-full");
 
 # Test Subject Alternative Names.
 switch_server_cert($node, 'server-multiple-alt-names');
 
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -220,12 +295,12 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"host=wronghost.alt-name.pg-ssltest.test",
-	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "wronghost.alt-name.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "wronghost.alt-name.pg-ssltest.test"\E|requested domain name does not match the server's certificate/,
 	"host name not matching with X.509 Subject Alternative Names");
 test_connect_fails(
 	$common_connstr,
 	"host=deep.subdomain.wildcard.pg-ssltest.test",
-	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E|requested domain name does not match the server's certificate/,
 	"host name not matching with X.509 Subject Alternative Names wildcard");
 
 # Test certificate with a single Subject Alternative Name. (this gives a
@@ -233,7 +308,7 @@ test_connect_fails(
 switch_server_cert($node, 'server-single-alt-name');
 
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -243,12 +318,12 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"host=wronghost.alt-name.pg-ssltest.test",
-	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "wronghost.alt-name.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "wronghost.alt-name.pg-ssltest.test"\E|requested domain name does not match the server's certificate/,
 	"host name not matching with a single X.509 Subject Alternative Name");
 test_connect_fails(
 	$common_connstr,
 	"host=deep.subdomain.wildcard.pg-ssltest.test",
-	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E|requested domain name does not match the server's certificate/,
 	"host name not matching with a single X.509 Subject Alternative Name wildcard"
 );
 
@@ -257,7 +332,7 @@ test_connect_fails(
 switch_server_cert($node, 'server-cn-and-alt-names');
 
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -270,14 +345,14 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"host=common-name.pg-ssltest.test",
-	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 1 other name) does not match host name "common-name.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 1 other name) does not match host name "common-name.pg-ssltest.test"\E|requested domain name does not match the server's certificate/,
 	"certificate with both a CN and SANs ignores CN");
 
 # Finally, test a server certificate that has no CN or SANs. Of course, that's
 # not a very sensible certificate, but libpq should handle it gracefully.
 switch_server_cert($node, 'server-no-names');
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -286,7 +361,7 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"sslmode=verify-full host=common-name.pg-ssltest.test",
-	qr/could not get server's host name from server certificate/,
+	qr/could not get server's host name from server certificate|requested domain name does not match the server's certificate./,
 	"server certificate without CN or SANs sslmode=verify-full");
 
 # Test that the CRL works
@@ -298,11 +373,11 @@ $common_connstr =
 # Without the CRL, succeeds. With it, fails.
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca cert_database=ssl/nss/root+server_ca.crt.db",
 	"connects without client-side CRL");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/root+server.crl",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/server.crl cert_database=ssl/nss/root+server_ca.crt__server.crl.db",
 	qr/SSL error/,
 	"does not connect with client-side CRL");
 
@@ -323,32 +398,50 @@ command_like(
 # Test min/max SSL protocol versions.
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.2",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.2 cert_database=ssl/nss/root+server_ca.crt.db",
 	"connection success with correct range of TLS protocol versions");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.1",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.1 cert_database=ssl/nss/root+server_ca.crt.db",
 	qr/invalid SSL protocol version range/,
 	"connection failure with incorrect range of TLS protocol versions");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=incorrect_tls",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=incorrect_tls cert_database=ssl/nss/root+server_ca.crt.db",
 	qr/invalid ssl_min_protocol_version value/,
 	"connection failure with an incorrect SSL protocol minimum bound");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_max_protocol_version=incorrect_tls",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_max_protocol_version=incorrect_tls cert_database=ssl/nss/root+server_ca.crt.db",
 	qr/invalid ssl_max_protocol_version value/,
 	"connection failure with an incorrect SSL protocol maximum bound");
 
+# tests of NSS generated certificates/keys
+SKIP:
+{
+	skip "NSS specific tests",            1 if ($openssl);
+
+	switch_server_cert($node, 'native_server-root', 'native_ca-root');
+	$common_connstr =
+	  "user=ssltestuser dbname=trustdb hostaddr=$SERVERHOSTADDR host=common-name.pg-ssltest.test";
+
+	test_connect_ok(
+		$common_connstr,
+		"sslmode=require user=ssltestuser",
+		"NSS generated certificates"
+	);
+}
+
 ### Server-side tests.
 ###
 ### Test certificate authorization.
 
+switch_server_cert($node, 'server-revoked');
+
 note "running server tests";
 
 $common_connstr =
-  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR";
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client.crt__client.key.db";
 
 # no client cert
 test_connect_fails(
@@ -364,32 +457,43 @@ test_connect_ok(
 	"certificate authorization succeeds with correct client cert in PEM format"
 );
 
-# correct client cert in unencrypted DER
-test_connect_ok(
-	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-der_tmp.key",
-	"certificate authorization succeeds with correct client cert in DER format"
-);
+$common_connstr =
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR";
+
+SKIP:
+{
+	skip "NSS database not implemented in the Makefile", 1 if ($nss);
+	# correct client cert in unencrypted DER
+	test_connect_ok(
+		$common_connstr,
+		"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-der_tmp.key",
+		"certificate authorization succeeds with correct client cert in DER format"
+	);
+}
 
 # correct client cert in encrypted PEM
 test_connect_ok(
 	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='dUmmyP^#+'",
+	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='dUmmyP^#+' cert_database=ssl/nss/client.crt__client-encrypted-pem.key.db",
 	"certificate authorization succeeds with correct client cert in encrypted PEM format"
 );
 
-# correct client cert in encrypted DER
-test_connect_ok(
-	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-der_tmp.key sslpassword='dUmmyP^#+'",
-	"certificate authorization succeeds with correct client cert in encrypted DER format"
-);
+SKIP:
+{
+	skip "NSS database not implemented in the Makefile", 1 if ($nss);
+	# correct client cert in encrypted DER
+	test_connect_ok(
+		$common_connstr,
+		"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-der_tmp.key sslpassword='dUmmyP^#+'",
+		"certificate authorization succeeds with correct client cert in encrypted DER format"
+	);
+}
 
 # correct client cert in encrypted PEM with wrong password
 test_connect_fails(
 	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='wrong'",
-	qr!\Qprivate key file "ssl/client-encrypted-pem_tmp.key": bad decrypt\E!,
+	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='wrong' cert_database=ssl/nss/client.crt__client-encrypted-pem.key.db",
+	qr!connection requires a valid client certificate|\Qprivate key file "ssl/client-encrypted-pem_tmp.key": bad decrypt\E!,
 	"certificate authorization fails with correct client cert and wrong password in encrypted PEM format"
 );
 
@@ -429,18 +533,19 @@ command_like(
 		'-P',
 		'null=_null_',
 		'-d',
-		"$common_connstr user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client_tmp.key",
+		"$common_connstr user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client_tmp.key cert_database=ssl/nss/client.crt__client.key.db",
 		'-c',
 		"SELECT * FROM pg_stat_ssl WHERE pid = pg_backend_pid()"
 	],
 	qr{^pid,ssl,version,cipher,bits,compression,client_dn,client_serial,issuer_dn\r?\n
-				^\d+,t,TLSv[\d.]+,[\w-]+,\d+,f,/CN=ssltestuser,1,\Q/CN=Test CA for PostgreSQL SSL regression test client certs\E\r?$}mx,
+				^\d+,t,TLSv[\d.]+,[\w-]+,\d+,f,/?CN=ssltestuser,1,/?\QCN=Test CA for PostgreSQL SSL regression test client certs\E\r?$}mx,
 	'pg_stat_ssl with client certificate');
 
 # client key with wrong permissions
 SKIP:
 {
 	skip "Permissions check not enforced on Windows", 2 if ($windows_os);
+	skip "Key not on filesystem with NSS",            2 if ($nss);
 
 	test_connect_fails(
 		$common_connstr,
@@ -453,10 +558,13 @@ SKIP:
 test_connect_fails(
 	$common_connstr,
 	"user=anotheruser sslcert=ssl/client.crt sslkey=ssl/client_tmp.key",
-	qr/certificate authentication failed for user "anotheruser"/,
+	qr/unable to verify certificate|certificate authentication failed for user "anotheruser"/,
 	"certificate authorization fails with client cert belonging to another user"
 );
 
+$common_connstr =
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client-revoked.crt__client-revoked.key.db";
+
 # revoked client cert
 test_connect_fails(
 	$common_connstr,
@@ -468,7 +576,7 @@ test_connect_fails(
 # works, iff username matches Common Name
 # fails, iff username doesn't match Common Name.
 $common_connstr =
-  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=verifydb hostaddr=$SERVERHOSTADDR";
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=verifydb hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client.crt__client.key.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -494,14 +602,18 @@ test_connect_ok(
 # intermediate client_ca.crt is provided by client, and isn't in server's ssl_ca_file
 switch_server_cert($node, 'server-cn-only', 'root_ca');
 $common_connstr =
-  "user=ssltestuser dbname=certdb sslkey=ssl/client_tmp.key sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR";
+  "user=ssltestuser dbname=certdb sslkey=ssl/client_tmp.key sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client+client_ca.crt__client.key.db";
 
 test_connect_ok(
 	$common_connstr,
 	"sslmode=require sslcert=ssl/client+client_ca.crt",
 	"intermediate client certificate is provided by client");
-test_connect_fails($common_connstr, "sslmode=require sslcert=ssl/client.crt",
-	qr/SSL error/, "intermediate client certificate is missing");
+
+test_connect_fails(
+	$common_connstr,
+	"sslmode=require sslcert=ssl/client.crt",
+	qr/connection requires a valid client certificate|SSL error/,
+	"intermediate client certificate is missing");
 
 # clean up
 
diff --git a/src/test/ssl/t/002_scram.pl b/src/test/ssl/t/002_scram.pl
index 3383b3e531..55fe3922e1 100644
--- a/src/test/ssl/t/002_scram.pl
+++ b/src/test/ssl/t/002_scram.pl
@@ -13,7 +13,26 @@ use lib $FindBin::RealBin;
 
 use SSL::Server;
 
-if ($ENV{with_ssl} ne 'openssl')
+my $openssl;
+my $nss;
+
+my $supports_tls_server_end_point;
+
+if ($ENV{with_ssl} eq 'openssl')
+{
+	$openssl = 1;
+	# Determine whether build supports tls-server-end-point.
+	$supports_tls_server_end_point =
+		check_pg_config("#define HAVE_X509_GET_SIGNATURE_NID 1");
+	plan tests => $supports_tls_server_end_point ? 9 : 10;
+}
+elsif ($ENV{with_ssl} eq 'nss')
+{
+	$nss = 1;
+	$supports_tls_server_end_point = 1;
+	plan tests => 9;
+}
+else
 {
 	plan skip_all => 'SSL not supported by this build';
 }
@@ -23,12 +42,6 @@ my $SERVERHOSTADDR = '127.0.0.1';
 # This is the pattern to use in pg_hba.conf to match incoming connections.
 my $SERVERHOSTCIDR = '127.0.0.1/32';
 
-# Determine whether build supports tls-server-end-point.
-my $supports_tls_server_end_point =
-  check_pg_config("#define HAVE_X509_GET_SIGNATURE_NID 1");
-
-my $number_of_tests = $supports_tls_server_end_point ? 9 : 10;
-
 # Allocation of base connection string shared among multiple tests.
 my $common_connstr;
 
@@ -97,7 +110,7 @@ my $client_tmp_key = "ssl/client_scram_tmp.key";
 copy("ssl/client.key", $client_tmp_key);
 chmod 0600, $client_tmp_key;
 test_connect_fails(
-	"sslcert=ssl/client.crt sslkey=$client_tmp_key sslrootcert=invalid hostaddr=$SERVERHOSTADDR",
+	"sslcert=ssl/client.crt sslkey=$client_tmp_key sslrootcert=invalid hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client.crt__client.key.db",
 	"dbname=certdb user=ssltestuser channel_binding=require",
 	qr/channel binding required, but server authenticated client without channel binding/,
 	"Cert authentication and channel_binding=require");
diff --git a/src/test/ssl/t/SSL/Backend/NSS.pm b/src/test/ssl/t/SSL/Backend/NSS.pm
new file mode 100644
index 0000000000..c5b31e584a
--- /dev/null
+++ b/src/test/ssl/t/SSL/Backend/NSS.pm
@@ -0,0 +1,73 @@
+package SSL::Backend::NSS;
+
+use strict;
+use warnings;
+use Exporter;
+
+our @ISA       = qw(Exporter);
+our @EXPORT_OK = qw(get_new_nss_backend);
+
+sub new
+{
+	my ($class) = @_;
+
+	my $self = { _library => 'NSS' };
+
+	bless $self, $class;
+
+	return $self;
+}
+
+sub get_new_nss_backend
+{
+	my $class = 'SSL::Backend::NSS';
+
+	return $class->new();
+}
+
+sub init
+{
+	# Make sure the certificate databases are in place?
+}
+
+sub get_library
+{
+	my ($self) = @_;
+
+	return $self->{_library};
+}
+
+sub set_server_cert
+{
+	my $self     = $_[0];
+	my $certfile = $_[1];
+	my $cafile   = $_[2];
+	my $keyfile  = $_[3];
+
+	my $cert_nickname;
+
+	if ($certfile =~ /native/)
+	{
+		$cert_nickname = $certfile;
+	}
+	else
+	{
+		$cert_nickname = $certfile . '.crt__' . $keyfile . '.key';
+	}
+	my $cert_database = $cert_nickname . '.db';
+
+	my $sslconf =
+	    "ssl_ca_file='$cafile.crt'\n"
+	  . "ssl_cert_file='ssl/$certfile.crt'\n"
+	  . "ssl_crl_file=''\n"
+	  . "ssl_database='nss/$cert_database'\n";
+
+	return $sslconf;
+}
+
+sub cleanup
+{
+	# Something?
+}
+
+1;
-- 
2.21.1 (Apple Git-122.3)

From e080f3d1bfddca5487b33fc246d2114bf989921c Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Mon, 8 Feb 2021 23:52:34 +0100
Subject: [PATCH v27 2/9] Refactor SSL testharness for multiple library

The SSL testharness was fully tied to OpenSSL in the way the server was
set up and reconfigured. This refactors the SSLServer module into a SSL
library agnostic SSL/Server module which in turn use SSL/Backend/<lib>
modules for the implementation details.

No changes are done to the actual tests, this only change how setup and
teardown is performed.
---
 src/test/ssl/t/001_ssltests.pl                |  62 ++---------
 src/test/ssl/t/002_scram.pl                   |   6 +-
 src/test/ssl/t/SSL/Backend/OpenSSL.pm         | 103 ++++++++++++++++++
 .../ssl/t/{SSLServer.pm => SSL/Server.pm}     |  80 +++++++++++---
 4 files changed, 180 insertions(+), 71 deletions(-)
 create mode 100644 src/test/ssl/t/SSL/Backend/OpenSSL.pm
 rename src/test/ssl/t/{SSLServer.pm => SSL/Server.pm} (78%)

diff --git a/src/test/ssl/t/001_ssltests.pl b/src/test/ssl/t/001_ssltests.pl
index 7928de4e7c..a6d79e2bfc 100644
--- a/src/test/ssl/t/001_ssltests.pl
+++ b/src/test/ssl/t/001_ssltests.pl
@@ -4,20 +4,14 @@ use PostgresNode;
 use TestLib;
 use Test::More;
 
-use File::Copy;
-
 use FindBin;
 use lib $FindBin::RealBin;
 
-use SSLServer;
+use SSL::Server;
 
 if ($ENV{with_ssl} ne 'openssl')
 {
-	plan skip_all => 'OpenSSL not supported by this build';
-}
-else
-{
-	plan tests => 93;
+	plan skip_all => 'SSL not supported by this build';
 }
 
 #### Some configuration
@@ -32,32 +26,6 @@ my $SERVERHOSTCIDR = '127.0.0.1/32';
 # Allocation of base connection string shared among multiple tests.
 my $common_connstr;
 
-# The client's private key must not be world-readable, so take a copy
-# of the key stored in the code tree and update its permissions.
-#
-# This changes ssl/client.key to ssl/client_tmp.key etc for the rest
-# of the tests.
-my @keys = (
-	"client",     "client-revoked",
-	"client-der", "client-encrypted-pem",
-	"client-encrypted-der");
-foreach my $key (@keys)
-{
-	copy("ssl/${key}.key", "ssl/${key}_tmp.key")
-	  or die
-	  "couldn't copy ssl/${key}.key to ssl/${key}_tmp.key for permissions change: $!";
-	chmod 0600, "ssl/${key}_tmp.key"
-	  or die "failed to change permissions on ssl/${key}_tmp.key: $!";
-}
-
-# Also make a copy of that explicitly world-readable.  We can't
-# necessarily rely on the file in the source tree having those
-# permissions.  Add it to @keys to include it in the final clean
-# up phase.
-copy("ssl/client.key", "ssl/client_wrongperms_tmp.key");
-chmod 0644, "ssl/client_wrongperms_tmp.key";
-push @keys, 'client_wrongperms';
-
 #### Set up the server.
 
 note "setting up data directory";
@@ -72,32 +40,22 @@ $node->start;
 
 # Run this before we lock down access below.
 my $result = $node->safe_psql('postgres', "SHOW ssl_library");
-is($result, 'OpenSSL', 'ssl_library parameter');
+is($result, SSL::Server::ssl_library(), 'ssl_library parameter');
 
 configure_test_server_for_ssl($node, $SERVERHOSTADDR, $SERVERHOSTCIDR,
 	'trust');
 
 note "testing password-protected keys";
 
-open my $sslconf, '>', $node->data_dir . "/sslconfig.conf";
-print $sslconf "ssl=on\n";
-print $sslconf "ssl_cert_file='server-cn-only.crt'\n";
-print $sslconf "ssl_key_file='server-password.key'\n";
-print $sslconf "ssl_passphrase_command='echo wrongpassword'\n";
-close $sslconf;
-
+set_server_cert($node, 'server-cn-only', 'root+client_ca',
+				   'server-password', 'echo wrongpassword');
 command_fails(
 	[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
 	'restart fails with password-protected key file with wrong password');
 $node->_update_pid(0);
 
-open $sslconf, '>', $node->data_dir . "/sslconfig.conf";
-print $sslconf "ssl=on\n";
-print $sslconf "ssl_cert_file='server-cn-only.crt'\n";
-print $sslconf "ssl_key_file='server-password.key'\n";
-print $sslconf "ssl_passphrase_command='echo secret1'\n";
-close $sslconf;
-
+set_server_cert($node, 'server-cn-only', 'root+client_ca',
+				'server-password', 'echo secret1');
 command_ok(
 	[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
 	'restart succeeds with password-protected key file');
@@ -546,7 +504,5 @@ test_connect_fails($common_connstr, "sslmode=require sslcert=ssl/client.crt",
 	qr/SSL error/, "intermediate client certificate is missing");
 
 # clean up
-foreach my $key (@keys)
-{
-	unlink("ssl/${key}_tmp.key");
-}
+
+SSL::Server::cleanup();
diff --git a/src/test/ssl/t/002_scram.pl b/src/test/ssl/t/002_scram.pl
index 410b9e910d..3383b3e531 100644
--- a/src/test/ssl/t/002_scram.pl
+++ b/src/test/ssl/t/002_scram.pl
@@ -11,11 +11,11 @@ use File::Copy;
 use FindBin;
 use lib $FindBin::RealBin;
 
-use SSLServer;
+use SSL::Server;
 
 if ($ENV{with_ssl} ne 'openssl')
 {
-	plan skip_all => 'OpenSSL not supported by this build';
+	plan skip_all => 'SSL not supported by this build';
 }
 
 # This is the hostname used to connect to the server.
@@ -104,5 +104,3 @@ test_connect_fails(
 
 # clean up
 unlink($client_tmp_key);
-
-done_testing($number_of_tests);
diff --git a/src/test/ssl/t/SSL/Backend/OpenSSL.pm b/src/test/ssl/t/SSL/Backend/OpenSSL.pm
new file mode 100644
index 0000000000..62b11b7632
--- /dev/null
+++ b/src/test/ssl/t/SSL/Backend/OpenSSL.pm
@@ -0,0 +1,103 @@
+package SSL::Backend::OpenSSL;
+
+use strict;
+use warnings;
+use Exporter;
+use File::Copy;
+
+our @ISA       = qw(Exporter);
+our @EXPORT_OK = qw(get_new_openssl_backend);
+
+our (@keys);
+
+INIT
+{
+	@keys = (
+		"client",     "client-revoked",
+		"client-der", "client-encrypted-pem",
+		"client-encrypted-der");
+}
+
+sub new
+{
+	my ($class) = @_;
+
+	my $self = { _library => 'OpenSSL' };
+
+	bless $self, $class;
+
+	return $self;
+}
+
+sub get_new_openssl_backend
+{
+	my $class = 'SSL::Backend::OpenSSL';
+
+	my $backend = $class->new();
+
+	return $backend;
+}
+
+sub init
+{
+	# The client's private key must not be world-readable, so take a copy
+	# of the key stored in the code tree and update its permissions.
+	#
+	# This changes ssl/client.key to ssl/client_tmp.key etc for the rest
+	# of the tests.
+	foreach my $key (@keys)
+	{
+		copy("ssl/${key}.key", "ssl/${key}_tmp.key")
+		  or die
+		  "couldn't copy ssl/${key}.key to ssl/${key}_tmp.key for permissions change: $!";
+		chmod 0600, "ssl/${key}_tmp.key"
+		  or die "failed to change permissions on ssl/${key}_tmp.key: $!";
+	}
+
+	# Also make a copy of that explicitly world-readable.  We can't
+	# necessarily rely on the file in the source tree having those
+	# permissions. Add it to @keys to include it in the final clean
+	# up phase.
+	copy("ssl/client.key", "ssl/client_wrongperms_tmp.key")
+	  or die
+	  "couldn't copy ssl/client.key to ssl/client_wrongperms_tmp.key: $!";
+	chmod 0644, "ssl/client_wrongperms_tmp.key"
+	  or die
+	  "failed to change permissions on ssl/client_wrongperms_tmp.key: $!";
+	push @keys, 'client_wrongperms';
+}
+
+# Change the configuration to use given server cert file, and reload
+# the server so that the configuration takes effect.
+sub set_server_cert
+{
+	my $self     = $_[0];
+	my $certfile = $_[1];
+	my $cafile   = $_[2] || "root+client_ca";
+	my $keyfile  = $_[3] || $certfile;
+
+	my $sslconf =
+	    "ssl_ca_file='$cafile.crt'\n"
+	  . "ssl_cert_file='$certfile.crt'\n"
+	  . "ssl_key_file='$keyfile.key'\n"
+	  . "ssl_crl_file='root+client.crl'\n";
+
+	return $sslconf;
+}
+
+sub get_library
+{
+	my ($self) = @_;
+
+	return $self->{_library};
+}
+
+sub cleanup
+{
+	foreach my $key (@keys)
+	{
+		unlink("ssl/${key}_tmp.key");
+	}
+}
+
+1;
diff --git a/src/test/ssl/t/SSLServer.pm b/src/test/ssl/t/SSL/Server.pm
similarity index 78%
rename from src/test/ssl/t/SSLServer.pm
rename to src/test/ssl/t/SSL/Server.pm
index f5987a003e..ee901855b5 100644
--- a/src/test/ssl/t/SSLServer.pm
+++ b/src/test/ssl/t/SSL/Server.pm
@@ -23,19 +23,39 @@
 # explicitly because an invalid sslcert or sslrootcert, respectively,
 # causes those to be ignored.)
 
-package SSLServer;
+package SSL::Server;
 
 use strict;
 use warnings;
 use PostgresNode;
+use RecursiveCopy;
 use TestLib;
 use File::Basename;
 use File::Copy;
 use Test::More;
+use SSL::Backend::OpenSSL qw(get_new_openssl_backend);
+use SSL::Backend::NSS qw(get_new_nss_backend);
+
+our ($openssl, $nss, $backend);
+
+# The TLS backend which the server is using should be mostly transparent for
+# the user, apart from individual configuration settings, so keep the backend
+# specific things abstracted behind SSL::Server.
+if ($ENV{with_ssl} eq 'openssl')
+{
+	$backend = get_new_openssl_backend();
+	$openssl = 1;
+}
+elsif ($ENV{with_ssl} eq 'nss')
+{
+	$backend = get_new_nss_backend();
+	$nss     = 1;
+}
 
 use Exporter 'import';
 our @EXPORT = qw(
   configure_test_server_for_ssl
+  set_server_cert
   switch_server_cert
   test_connect_fails
   test_connect_ok
@@ -144,12 +164,19 @@ sub configure_test_server_for_ssl
 	close $sslconf;
 
 	# Copy all server certificates and keys, and client root cert, to the data dir
-	copy_files("ssl/server-*.crt", $pgdata);
-	copy_files("ssl/server-*.key", $pgdata);
-	chmod(0600, glob "$pgdata/server-*.key") or die $!;
-	copy_files("ssl/root+client_ca.crt", $pgdata);
-	copy_files("ssl/root_ca.crt",        $pgdata);
-	copy_files("ssl/root+client.crl",    $pgdata);
+	if (defined($openssl))
+	{
+		copy_files("ssl/server-*.crt", $pgdata);
+		copy_files("ssl/server-*.key", $pgdata);
+		chmod(0600, glob "$pgdata/server-*.key") or die $!;
+		copy_files("ssl/root+client_ca.crt", $pgdata);
+		copy_files("ssl/root_ca.crt",        $pgdata);
+		copy_files("ssl/root+client.crl",    $pgdata);
+	}
+	elsif (defined($nss))
+	{
+		RecursiveCopy::copypath("ssl/nss", $pgdata . "/nss") if -e "ssl/nss";
+	}
 
 	# Stop and restart server to load new listen_addresses.
 	$node->restart;
@@ -157,26 +184,51 @@ sub configure_test_server_for_ssl
 	# Change pg_hba after restart because hostssl requires ssl=on
 	configure_hba_for_ssl($node, $servercidr, $authmethod);
 
+	# Finally, perform backend specific configuration
+	$backend->init();
+
 	return;
 }
 
-# Change the configuration to use given server cert file, and reload
-# the server so that the configuration takes effect.
-sub switch_server_cert
+sub ssl_library
+{
+	return $backend->get_library();
+}
+
+sub cleanup
+{
+	$backend->cleanup();
+}
+
+# Change the configuration to use given server cert file,
+sub set_server_cert
 {
 	my $node     = $_[0];
 	my $certfile = $_[1];
 	my $cafile   = $_[2] || "root+client_ca";
+	my $keyfile  = $_[3] || '';
+	my $pwcmd    = $_[4] || '';
 	my $pgdata   = $node->data_dir;
 
+	$keyfile = $certfile if $keyfile eq '';
+
 	open my $sslconf, '>', "$pgdata/sslconfig.conf";
 	print $sslconf "ssl=on\n";
-	print $sslconf "ssl_ca_file='$cafile.crt'\n";
-	print $sslconf "ssl_cert_file='$certfile.crt'\n";
-	print $sslconf "ssl_key_file='$certfile.key'\n";
-	print $sslconf "ssl_crl_file='root+client.crl'\n";
+	print $sslconf $backend->set_server_cert($certfile, $cafile, $keyfile);
+	print $sslconf "ssl_passphrase_command='$pwcmd'\n"
+	  unless $pwcmd eq '';
 	close $sslconf;
+	return;
+}
 
+# Change the configuration to use given server cert file, and reload
+# the server so that the configuration takes effect.
+# Takes the same arguments as set_server_cert, which it calls to do that
+# piece of the work.
+sub switch_server_cert
+{
+	my $node = $_[0];
+	set_server_cert(@_);
 	$node->restart;
 	return;
 }
-- 
2.21.1 (Apple Git-122.3)

From 4b9ebae85c0756f0092ae3ca15369246f1b662a5 Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Mon, 8 Feb 2021 23:52:22 +0100
Subject: [PATCH v27 1/9] nss: Support libnss as TLS library in libpq

This commit contains the frontend and backend portion of TLS support
in libpq to allow encrypted connections. The implementation is done
as a drop-in replacement for the OpenSSL support and leverages the
same internal API for abstracting library specific details.

A new GUC, ssl_database, is used to identify the NSS database used for
the serverside certificates and keys. The existing certificate and key
GUCs are used for providing certificate and key nicknames.

Client side there is a new connection parameter, cert_database, to
identify the client cert and key. All existing sslmodes are supported
in the same way as with OpenSSL.

Authors: Daniel Gustafsson, Andrew Dunstan, Jacob Champion
Reviewed-by: Michael Paquier
---
 .../postgres_fdw/expected/postgres_fdw.out    |    2 +-
 src/backend/libpq/auth.c                      |    7 +
 src/backend/libpq/be-secure-nss.c             | 1388 +++++++++++++++++
 src/backend/libpq/be-secure.c                 |    3 +
 src/backend/utils/misc/guc.c                  |   20 +-
 src/common/cipher_nss.c                       |  192 +++
 src/include/common/nss.h                      |   49 +
 src/include/libpq/libpq-be.h                  |   10 +-
 src/include/libpq/libpq.h                     |    3 +
 src/include/pg_config_manual.h                |    2 +-
 src/interfaces/libpq/fe-connect.c             |    4 +
 src/interfaces/libpq/fe-secure-nss.c          | 1096 +++++++++++++
 src/interfaces/libpq/fe-secure.c              |   21 +
 src/interfaces/libpq/libpq-fe.h               |   11 +
 src/interfaces/libpq/libpq-int.h              |   25 +-
 15 files changed, 2828 insertions(+), 5 deletions(-)
 create mode 100644 src/backend/libpq/be-secure-nss.c
 create mode 100644 src/common/cipher_nss.c
 create mode 100644 src/include/common/nss.h
 create mode 100644 src/interfaces/libpq/fe-secure-nss.c

diff --git a/contrib/postgres_fdw/expected/postgres_fdw.out b/contrib/postgres_fdw/expected/postgres_fdw.out
index 60c7e115d6..3bec874fa6 100644
--- a/contrib/postgres_fdw/expected/postgres_fdw.out
+++ b/contrib/postgres_fdw/expected/postgres_fdw.out
@@ -8946,7 +8946,7 @@ DO $d$
     END;
 $d$;
 ERROR:  invalid option "password"
-HINT:  Valid options in this context are: service, passfile, channel_binding, connect_timeout, dbname, host, hostaddr, port, options, application_name, keepalives, keepalives_idle, keepalives_interval, keepalives_count, tcp_user_timeout, sslmode, sslcompression, sslcert, sslkey, sslrootcert, sslcrl, requirepeer, ssl_min_protocol_version, ssl_max_protocol_version, gssencmode, krbsrvname, gsslib, target_session_attrs, use_remote_estimate, fdw_startup_cost, fdw_tuple_cost, extensions, updatable, fetch_size, batch_size
+HINT:  Valid options in this context are: service, passfile, channel_binding, connect_timeout, dbname, host, hostaddr, port, options, application_name, keepalives, keepalives_idle, keepalives_interval, keepalives_count, tcp_user_timeout, sslmode, sslcompression, sslcert, sslkey, sslrootcert, sslcrl, requirepeer, ssl_min_protocol_version, ssl_max_protocol_version, gssencmode, krbsrvname, gsslib, target_session_attrs, cert_database, use_remote_estimate, fdw_startup_cost, fdw_tuple_cost, extensions, updatable, fetch_size, batch_size
 CONTEXT:  SQL statement "ALTER SERVER loopback_nopw OPTIONS (ADD password 'dummypw')"
 PL/pgSQL function inline_code_block line 3 at EXECUTE
 -- If we add a password for our user mapping instead, we should get a different
diff --git a/src/backend/libpq/auth.c b/src/backend/libpq/auth.c
index 545635f41a..09ad2ad063 100644
--- a/src/backend/libpq/auth.c
+++ b/src/backend/libpq/auth.c
@@ -2849,7 +2849,14 @@ CheckCertAuth(Port *port)
 {
 	int			status_check_usermap = STATUS_ERROR;
 
+#if defined(USE_OPENSSL)
 	Assert(port->ssl);
+#elif defined(USE_NSS)
+	/* TODO: should we rename pr_fd to ssl, to keep consistency? */
+	Assert(port->pr_fd);
+#else
+	Assert(false);
+#endif
 
 	/* Make sure we have received a username in the certificate */
 	if (port->peer_cn == NULL ||
diff --git a/src/backend/libpq/be-secure-nss.c b/src/backend/libpq/be-secure-nss.c
new file mode 100644
index 0000000000..a17e6c7e5d
--- /dev/null
+++ b/src/backend/libpq/be-secure-nss.c
@@ -0,0 +1,1388 @@
+/*-------------------------------------------------------------------------
+ *
+ * be-secure-nss.c
+ *	  functions for supporting NSS as a TLS backend
+ *
+ *
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ *	  src/backend/libpq/be-secure-nss.c
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#include "postgres.h"
+
+#include <sys/stat.h>
+
+#include "common/nss.h"
+
+/*
+ * The nspr/obsolete/protypes.h NSPR header typedefs uint64 and int64 with
+ * colliding definitions from ours, causing a much expected compiler error.
+ * Remove backwards compatibility with ancient NSPR versions to avoid this.
+ */
+#define NO_NSPR_10_SUPPORT
+#include <nspr/nspr.h>
+#include <nspr/prerror.h>
+#include <nspr/prio.h>
+#include <nspr/prmem.h>
+#include <nspr/prtypes.h>
+
+#include <nss/nss.h>
+#include <nss/base64.h>
+#include <nss/cert.h>
+#include <nss/certdb.h>
+#include <nss/hasht.h>
+#include <nss/keyhi.h>
+#include <nss/pk11pub.h>
+#include <nss/secder.h>
+#include <nss/secerr.h>
+#include <nss/secitem.h>
+#include <nss/secoidt.h>
+#include <nss/secport.h>
+#include <nss/ssl.h>
+#include <nss/sslerr.h>
+#include <nss/sslproto.h>
+
+#include "lib/stringinfo.h"
+#include "libpq/libpq.h"
+#include "nodes/pg_list.h"
+#include "miscadmin.h"
+#include "storage/fd.h"
+#include "utils/guc.h"
+#include "utils/memutils.h"
+
+
+/* default init hook can be overridden by a shared library */
+static void default_nss_tls_init(bool isServerStart);
+nss_tls_init_hook_type nss_tls_init_hook = default_nss_tls_init;
+
+static PRDescIdentity pr_id;
+
+static PRIOMethods pr_iomethods;
+static NSSInitContext *nss_context = NULL;
+static SSLVersionRange desired_sslver;
+
+static char *external_ssl_passphrase_cb(PK11SlotInfo *slot, PRBool retry, void *arg);
+static SECStatus pg_SSLShutdownFunc(void *private_data, void *nss_data);
+static bool dummy_ssl_passwd_cb_called = false;
+static bool ssl_is_server_start;
+
+/*
+ * PR_ImportTCPSocket() is a private API, but very widely used, as it's the
+ * only way to make NSS use an already set up POSIX file descriptor rather
+ * than opening one itself. To quote the NSS documentation:
+ *
+ *		"In theory, code that uses PR_ImportTCPSocket may break when NSPR's
+ *		implementation changes. In practice, this is unlikely to happen because
+ *		NSPR's implementation has been stable for years and because of NSPR's
+ *		strong commitment to backward compatibility."
+ *
+ * https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSPR/Reference/PR_ImportTCPSocket
+ *
+ * The function is declared in <private/pprio.h>, but as it is a header marked
+ * private we declare it here rather than including it.
+ */
+NSPR_API(PRFileDesc *) PR_ImportTCPSocket(int);
+
+/* NSS IO layer callback overrides */
+static PRInt32 pg_ssl_read(PRFileDesc *fd, void *buf, PRInt32 amount,
+						   PRIntn flags, PRIntervalTime timeout);
+static PRInt32 pg_ssl_write(PRFileDesc *fd, const void *buf, PRInt32 amount,
+							PRIntn flags, PRIntervalTime timeout);
+static PRStatus pg_ssl_close(PRFileDesc *fd);
+/* Utility functions */
+static PRFileDesc *init_iolayer(Port *port);
+static uint16 ssl_protocol_version_to_nss(int v, const char *guc_name);
+
+static char *pg_SSLerrmessage(PRErrorCode errcode);
+static char *ssl_protocol_version_to_string(int v);
+static SECStatus pg_cert_auth_handler(void *arg, PRFileDesc *fd,
+									  PRBool checksig, PRBool isServer);
+static SECStatus pg_bad_cert_handler(void *arg, PRFileDesc *fd);
+static char *dummy_ssl_passphrase_cb(PK11SlotInfo *slot, PRBool retry, void *arg);
+
+/* ------------------------------------------------------------ */
+/*						 Public interface						*/
+/* ------------------------------------------------------------ */
+
+/*
+ * be_tls_init
+ *			Initialize the nss TLS library in the postmaster
+ *
+ * The majority of the setup needs to happen in be_tls_open_server since the
+ * NSPR initialization must happen after the forking of the backend. We could
+ * potentially move some parts in under !isServerStart, but so far this is the
+ * separation chosen.
+ */
+int
+be_tls_init(bool isServerStart)
+{
+	SECStatus	status;
+	SSLVersionRange supported_sslver;
+
+	status = SSL_ConfigServerSessionIDCacheWithOpt(0, 0, NULL, 1, 0, 0, PR_FALSE);
+	if (status != SECSuccess)
+	{
+		ereport(isServerStart ? FATAL : LOG,
+				(errmsg("unable to connect to TLS connection cache: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+		return -1;
+	}
+
+	if (!ssl_database || strlen(ssl_database) == 0)
+	{
+		ereport(isServerStart ? FATAL : LOG,
+				(errmsg("no certificate database specified")));
+		return -1;
+	}
+
+	/*
+	 * We check for the desired TLS version range here, even though we cannot
+	 * set it until be_open_server such that we can be compatible with how the
+	 * OpenSSL backend reports errors for incompatible range configurations.
+	 * Set either the default supported TLS version range, or the configured
+	 * range from ssl_min_protocol_version and ssl_max_protocol version. In
+	 * case the user hasn't defined the maximum allowed version we fall back
+	 * to the highest version TLS that the library supports.
+	 */
+	if (SSL_VersionRangeGetSupported(ssl_variant_stream, &supported_sslver) != SECSuccess)
+	{
+		ereport(isServerStart ? FATAL : LOG,
+				(errmsg("unable to get default protocol support from NSS")));
+		return -1;
+	}
+
+	/*
+	 * Set the fallback versions for the TLS protocol version range to a
+	 * combination of our minimal requirement and the library maximum. Error
+	 * messages should be kept identical to those in be-secure-openssl.c to
+	 * make translations easier.
+	 */
+	desired_sslver.min = SSL_LIBRARY_VERSION_TLS_1_0;
+	desired_sslver.max = supported_sslver.max;
+
+	if (ssl_min_protocol_version)
+	{
+		int			ver = ssl_protocol_version_to_nss(ssl_min_protocol_version,
+													  "ssl_min_protocol_version");
+
+		if (ver == -1)
+		{
+			ereport(isServerStart ? FATAL : LOG,
+					(errmsg("\"%s\" setting \"%s\" not supported by this build",
+							"ssl_min_protocol_version",
+							GetConfigOption("ssl_min_protocol_version",
+											false, false))));
+			return -1;
+		}
+
+		if (ver > 0)
+			desired_sslver.min = ver;
+	}
+
+	if (ssl_max_protocol_version)
+	{
+		int			ver = ssl_protocol_version_to_nss(ssl_max_protocol_version,
+													  "ssl_max_protocol_version");
+
+		if (ver == -1)
+		{
+			ereport(isServerStart ? FATAL : LOG,
+					(errmsg("\"%s\" setting \"%s\" not supported by this build",
+							"ssl_max_protocol_version",
+							GetConfigOption("ssl_max_protocol_version",
+											false, false))));
+			return -1;
+		}
+		if (ver > 0)
+			desired_sslver.max = ver;
+
+		if (ver < desired_sslver.min)
+		{
+			ereport(isServerStart ? FATAL : LOG,
+					(errmsg("could not set SSL protocol version range"),
+					 errdetail("\"%s\" cannot be higher than \"%s\"",
+							   "ssl_min_protocol_version",
+							   "ssl_max_protocol_version")));
+			return -1;
+		}
+	}
+
+	/*
+	 * Set the passphrase callback which will be used both to obtain the
+	 * passphrase from the user, as well as by NSS to obtain the phrase
+	 * repeatedly.
+	 */
+	ssl_is_server_start = isServerStart;
+	(*nss_tls_init_hook) (isServerStart);
+
+	return 0;
+}
+
+int
+be_tls_open_server(Port *port)
+{
+	SECStatus	status;
+	PRFileDesc *model;
+	PRFileDesc *pr_fd;
+	PRFileDesc *layer;
+	CERTCertificate *server_cert;
+	SECKEYPrivateKey *private_key;
+	CERTSignedCrl *crl;
+	SECItem		crlname;
+	char	   *cert_database;
+	NSSInitParameters params;
+
+	/*
+	 * The NSPR documentation states that runtime initialization via PR_Init
+	 * is no longer required, as the first caller into NSPR will perform the
+	 * initialization implicitly. The documentation doesn't however clarify
+	 * from which version this is holds true, so let's perform the potentially
+	 * superfluous initialization anyways to avoid crashing on older versions
+	 * of NSPR, as there is no difference in overhead.  The NSS documentation
+	 * still states that PR_Init must be called in some way (implicitly or
+	 * explicitly).
+	 *
+	 * The below parameters are what the implicit initialization would've done
+	 * for us, and should work even for older versions where it might not be
+	 * done automatically. The last parameter, maxPTDs, is set to various
+	 * values in other codebases, but has been unused since NSPR 2.1 which was
+	 * released sometime in 1998. In current versions of NSPR all parameters
+	 * are ignored.
+	 */
+	PR_Init(PR_USER_THREAD, PR_PRIORITY_NORMAL, 0 /* maxPTDs */ );
+
+	/*
+	 * The certificate path (configdir) must contain a valid NSS database. If
+	 * the certificate path isn't a valid directory, NSS will fall back on the
+	 * system certificate database. If the certificate path is a directory but
+	 * is empty then the initialization will fail. On the client side this can
+	 * be allowed for any sslmode but the verify-xxx ones.
+	 * https://bugzilla.redhat.com/show_bug.cgi?id=728562 For the server side
+	 * we won't allow this to fail however, as we require the certificate and
+	 * key to exist.
+	 *
+	 * The original design of NSS was for a single application to use a single
+	 * copy of it, initialized with NSS_Initialize() which isn't returning any
+	 * handle with which to refer to NSS. NSS initialization and shutdown are
+	 * global for the application, so a shutdown in another NSS enabled
+	 * library would cause NSS to be stopped for libpq as well.  The fix has
+	 * been to introduce NSS_InitContext which returns a context handle to
+	 * pass to NSS_ShutdownContext.  NSS_InitContext was introduced in NSS
+	 * 3.12, but the use of it is not very well documented.
+	 * https://bugzilla.redhat.com/show_bug.cgi?id=738456
+	 *
+	 * The InitParameters struct passed can be used to override internal
+	 * values in NSS, but the usage is not documented at all. When using
+	 * NSS_Init initializations, the values are instead set via PK11_Configure
+	 * calls so the PK11_Configure documentation can be used to glean some
+	 * details on these.
+	 *
+	 * https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS/PKCS11/Module_Specs
+	 */
+	memset(&params, '\0', sizeof(params));
+	params.length = sizeof(params);
+
+	if (!ssl_database || strlen(ssl_database) == 0)
+		ereport(FATAL,
+				(errmsg("no certificate database specified")));
+
+	cert_database = psprintf("sql:%s", ssl_database);
+	nss_context = NSS_InitContext(cert_database, "", "", "",
+								  &params,
+								  NSS_INIT_READONLY | NSS_INIT_PK11RELOAD);
+	pfree(cert_database);
+
+	if (!nss_context)
+		ereport(FATAL,
+				(errmsg("unable to read certificate database \"%s\": %s",
+						ssl_database, pg_SSLerrmessage(PR_GetError()))));
+
+	/*
+	 * Import the already opened socket as we don't want to use NSPR functions
+	 * for opening the network socket due to how the PostgreSQL protocol works
+	 * with TLS connections. This function is not part of the NSPR public API,
+	 * see the comment at the top of the file for the rationale of still using
+	 * it.
+	 */
+	pr_fd = PR_ImportTCPSocket(port->sock);
+	if (!pr_fd)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to connect to socket")));
+		return -1;
+	}
+
+	/*
+	 * Most of the documentation available, and implementations of, NSS/NSPR
+	 * use the PR_NewTCPSocket() function here, which has the drawback that it
+	 * can only create IPv4 sockets. Instead use PR_OpenTCPSocket() which
+	 * copes with IPv6 as well.
+	 *
+	 * We use a model filedescriptor here which is a construct in NSPR/NSS in
+	 * order to create a configuration template for sockets which can then be
+	 * applied to new sockets created. This makes more sense in a server which
+	 * accepts multiple connections and want to perform the boilerplate just
+	 * once, but it does provide a nice abstraction here as well in that we
+	 * can error out early without having performed any operation on the real
+	 * socket.
+	 */
+	model = PR_OpenTCPSocket(port->laddr.addr.ss_family);
+	if (!model)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to open socket")));
+		return -1;
+	}
+
+	/*
+	 * Convert the NSPR socket to an SSL socket. Ensuring the success of this
+	 * operation is critical as NSS SSL_* functions may return SECSuccess on
+	 * the socket even though SSL hasn't been enabled, which introduce a risk
+	 * of silent downgrades.
+	 */
+	model = SSL_ImportFD(NULL, model);
+	if (!model)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to enable TLS on socket")));
+		return -1;
+	}
+
+	/*
+	 * Configure basic settings for the connection over the SSL socket in
+	 * order to set it up as a server.
+	 */
+	if (SSL_OptionSet(model, SSL_SECURITY, PR_TRUE) != SECSuccess)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to configure TLS connection")));
+		return -1;
+	}
+
+	if (SSL_OptionSet(model, SSL_HANDSHAKE_AS_SERVER, PR_TRUE) != SECSuccess ||
+		SSL_OptionSet(model, SSL_HANDSHAKE_AS_CLIENT, PR_FALSE) != SECSuccess)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to configure TLS connection as server")));
+		return -1;
+	}
+
+	/*
+	 * SSLv2 is disabled by default, and SSLv3 will be excluded from the range
+	 * of allowed protocols further down. Since we really don't want these to
+	 * ever be enabled, let's use belts and suspenders and explicitly turn
+	 * them off as well.
+	 */
+	SSL_OptionSet(model, SSL_ENABLE_SSL2, PR_FALSE);
+	SSL_OptionSet(model, SSL_ENABLE_SSL3, PR_FALSE);
+
+#ifdef SSL_CBC_RANDOM_IV
+
+	/*
+	 * Enable protection against the BEAST attack in case the NSS server has
+	 * support for that. While SSLv3 is disabled, we may still allow TLSv1
+	 * which is affected. The option isn't documented as an SSL option, but as
+	 * an NSS environment variable.
+	 */
+	SSL_OptionSet(model, SSL_CBC_RANDOM_IV, PR_TRUE);
+#endif
+
+	/*
+	 * Configure the allowed ciphers. If there are no user preferred suites,
+	 * set the domestic policy.
+	 *
+	 * Historically there were different cipher policies based on export (and
+	 * import) restrictions: Domestic, Export and France. These are since long
+	 * removed with all ciphers being enabled by default. Due to backwards
+	 * compatibility, the old API is still used even though all three policies
+	 * now do the same thing.
+	 *
+	 * If SSLCipherSuites define a policy of the user, we set that rather than
+	 * enabling all ciphers via NSS_SetDomesticPolicy.
+	 *
+	 * TODO: while this code works, the set of ciphers which can be set and
+	 * still end up with a working socket is woefully underdocumented for
+	 * anything more recent than SSLv3 (the code for TLS actually calls ssl3
+	 * functions under the hood for SSL_CipherPrefSet), so it's unclear if
+	 * this is helpful or not. Using the policies works, but may be too
+	 * coarsely grained.
+	 *
+	 * Another TODO: The SSL_ImplementedCiphers table returned with calling
+	 * SSL_GetImplementedCiphers is sorted in server preference order. Sorting
+	 * SSLCipherSuites according to the order of the ciphers therein could be
+	 * a way to implement ssl_prefer_server_ciphers - if we at all want to use
+	 * cipher selection for NSS like how we do it for OpenSSL that is.
+	 */
+
+	/*
+	 * If no ciphers are specified, enable them all.
+	 */
+	if (!SSLCipherSuites || strlen(SSLCipherSuites) == 0)
+	{
+		status = NSS_SetDomesticPolicy();
+		if (status != SECSuccess)
+		{
+			ereport(COMMERROR,
+					(errmsg("unable to set cipher policy: %s",
+							pg_SSLerrmessage(PR_GetError()))));
+			return -1;
+		}
+	}
+	else
+	{
+		char	   *ciphers,
+				   *c;
+
+		char	   *sep = ":;, ";
+		PRUint16	ciphercode;
+		const		PRUint16 *nss_ciphers;
+
+		/*
+		 * If the user has specified a set of preferred cipher suites we start
+		 * by turning off all the existing suites to avoid the risk of down-
+		 * grades to a weaker cipher than expected.
+		 */
+		nss_ciphers = SSL_GetImplementedCiphers();
+		for (int i = 0; i < SSL_GetNumImplementedCiphers(); i++)
+			SSL_CipherPrefSet(model, nss_ciphers[i], PR_FALSE);
+
+		ciphers = pstrdup(SSLCipherSuites);
+
+		for (c = strtok(ciphers, sep); c; c = strtok(NULL, sep))
+		{
+			if (!pg_find_cipher(c, &ciphercode))
+			{
+				status = SSL_CipherPrefSet(model, ciphercode, PR_TRUE);
+				if (status != SECSuccess)
+				{
+					ereport(COMMERROR,
+							(errmsg("invalid cipher-suite specified: %s", c)));
+					return -1;
+				}
+			}
+		}
+
+		pfree(ciphers);
+	}
+
+	if (SSL_VersionRangeSet(model, &desired_sslver) != SECSuccess)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to set requested SSL protocol version range")));
+		return -1;
+	}
+
+	/*
+	 * Set up the custom IO layer.
+	 */
+	layer = init_iolayer(port);
+	if (!layer)
+		return -1;
+
+	if (PR_PushIOLayer(pr_fd, PR_TOP_IO_LAYER, layer) != PR_SUCCESS)
+	{
+		PR_Close(layer);
+		ereport(COMMERROR,
+				(errmsg("unable to push IO layer")));
+		return -1;
+	}
+
+	server_cert = PK11_FindCertFromNickname(ssl_cert_file, (void *) port);
+	if (!server_cert)
+	{
+		if (dummy_ssl_passwd_cb_called)
+		{
+			ereport(COMMERROR,
+					(errmsg("unable to load certificate for \"%s\": %s",
+							ssl_cert_file, pg_SSLerrmessage(PR_GetError())),
+					 errhint("The certificate requires a password.")));
+			return -1;
+		}
+		else
+		{
+			ereport(COMMERROR,
+					(errmsg("unable to find certificate for \"%s\": %s",
+							ssl_cert_file, pg_SSLerrmessage(PR_GetError()))));
+			return -1;
+		}
+	}
+
+	private_key = PK11_FindKeyByAnyCert(server_cert, (void *) port);
+	if (!private_key)
+	{
+		if (dummy_ssl_passwd_cb_called)
+		{
+			ereport(COMMERROR,
+					(errmsg("unable to load private key for \"%s\": %s",
+							ssl_cert_file, pg_SSLerrmessage(PR_GetError())),
+					 errhint("The private key requires a password.")));
+			return -1;
+		}
+		else
+		{
+			ereport(COMMERROR,
+					(errmsg("unable to find private key for \"%s\": %s",
+							ssl_cert_file, pg_SSLerrmessage(PR_GetError()))));
+			return -1;
+		}
+	}
+
+	/*
+	 * NSS doesn't use CRL files on disk, so we use the ssl_crl_file guc to
+	 * contain the CRL nickname for the current server certificate in the NSS
+	 * certificate database. The main difference from the OpenSSL backend is
+	 * that NSS will use the CRL regardless, but being able to make sure the
+	 * CRL is loaded seems like a good feature.
+	 */
+	if (ssl_crl_file[0])
+	{
+		SECITEM_CopyItem(NULL, &crlname, &server_cert->derSubject);
+		crl = SEC_FindCrlByName(CERT_GetDefaultCertDB(), &crlname, SEC_CRL_TYPE);
+		if (!crl)
+		{
+			ereport(COMMERROR,
+					(errmsg("specified CRL not found in database")));
+			return -1;
+		}
+		SEC_DestroyCrl(crl);
+	}
+
+	/*
+	 * Finally we must configure the socket for being a server by setting the
+	 * certificate and key. The NULL parameter is an SSLExtraServerCertData
+	 * pointer with the final parameter being the size of the extra server
+	 * cert data structure pointed to. This is typically only used for
+	 * credential delegation.
+	 */
+	status = SSL_ConfigServerCert(model, server_cert, private_key, NULL, 0);
+	if (status != SECSuccess)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to configure server for TLS server connections: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+		return -1;
+	}
+
+	ssl_loaded_verify_locations = true;
+
+	/*
+	 * At this point, we no longer have use for the certificate and private
+	 * key as they have been copied into the context by NSS. Destroy our
+	 * copies explicitly to clean out the memory as best we can.
+	 */
+	CERT_DestroyCertificate(server_cert);
+	SECKEY_DestroyPrivateKey(private_key);
+
+	/* Set up certificate authentication callback */
+	status = SSL_AuthCertificateHook(model, pg_cert_auth_handler, (void *) port);
+	if (status != SECSuccess)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to install authcert hook: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+		return -1;
+	}
+	SSL_BadCertHook(model, pg_bad_cert_handler, (void *) port);
+	SSL_OptionSet(model, SSL_REQUEST_CERTIFICATE, PR_TRUE);
+	SSL_OptionSet(model, SSL_REQUIRE_CERTIFICATE, PR_FALSE);
+
+	port->pr_fd = SSL_ImportFD(model, pr_fd);
+	if (!port->pr_fd)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to initialize")));
+		return -1;
+	}
+
+	PR_Close(model);
+
+	/*
+	 * Force a handshake on the next I/O request, the second parameter means
+	 * that we are a server, PR_FALSE would indicate being a client. NSPR
+	 * requires us to call SSL_ResetHandshake since we imported an already
+	 * established socket.
+	 */
+	status = SSL_ResetHandshake(port->pr_fd, PR_TRUE);
+	if (status != SECSuccess)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to initiate handshake: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+		return -1;
+	}
+	status = SSL_ForceHandshake(port->pr_fd);
+	if (status != SECSuccess)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to handshake: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+		return -1;
+	}
+
+	port->ssl_in_use = true;
+
+	/* Register out shutdown callback */
+	NSS_RegisterShutdown(pg_SSLShutdownFunc, port);
+
+	return 0;
+}
+
+ssize_t
+be_tls_read(Port *port, void *ptr, size_t len, int *waitfor)
+{
+	ssize_t		n_read;
+	PRErrorCode err;
+
+	n_read = PR_Read(port->pr_fd, ptr, len);
+
+	if (n_read < 0)
+	{
+		err = PR_GetError();
+
+		if (err == PR_WOULD_BLOCK_ERROR)
+		{
+			*waitfor = WL_SOCKET_READABLE;
+			errno = EWOULDBLOCK;
+		}
+		else
+			errno = ECONNRESET;
+	}
+
+	return n_read;
+}
+
+ssize_t
+be_tls_write(Port *port, void *ptr, size_t len, int *waitfor)
+{
+	ssize_t		n_write;
+	PRErrorCode err;
+	PRIntn		flags = 0;
+
+	/*
+	 * The flags parameter to PR_Send is no longer used and is, according to
+	 * the documentation, required to be zero.
+	 */
+	n_write = PR_Send(port->pr_fd, ptr, len, flags, PR_INTERVAL_NO_WAIT);
+
+	if (n_write < 0)
+	{
+		err = PR_GetError();
+
+		if (err == PR_WOULD_BLOCK_ERROR)
+		{
+			*waitfor = WL_SOCKET_WRITEABLE;
+			errno = EWOULDBLOCK;
+		}
+		else
+			errno = ECONNRESET;
+	}
+
+	return n_write;
+}
+
+void
+be_tls_close(Port *port)
+{
+	if (!port)
+		return;
+
+	if (port->peer_cn)
+	{
+		SSL_InvalidateSession(port->pr_fd);
+		pfree(port->peer_cn);
+		port->peer_cn = NULL;
+	}
+
+	PR_Close(port->pr_fd);
+	port->pr_fd = NULL;
+	port->ssl_in_use = false;
+
+	if (nss_context)
+	{
+		NSS_ShutdownContext(nss_context);
+		nss_context = NULL;
+	}
+}
+
+void
+be_tls_destroy(void)
+{
+	/*
+	 * It reads a bit odd to clear a session cache when we are destroying the
+	 * context altogether, but if the session cache isn't cleared before
+	 * shutting down the context it will fail with SEC_ERROR_BUSY.
+	 */
+	SSL_ClearSessionCache();
+}
+
+int
+be_tls_get_cipher_bits(Port *port)
+{
+	SECStatus	status;
+	SSLChannelInfo channel;
+	SSLCipherSuiteInfo suite;
+
+	status = SSL_GetChannelInfo(port->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+		goto error;
+
+	status = SSL_GetCipherSuiteInfo(channel.cipherSuite, &suite, sizeof(suite));
+	if (status != SECSuccess)
+		goto error;
+
+	return suite.effectiveKeyBits;
+
+error:
+	ereport(WARNING,
+			(errmsg("unable to extract TLS session information: %s",
+					pg_SSLerrmessage(PR_GetError()))));
+	return 0;
+}
+
+/*
+ * be_tls_get_compression
+ *
+ * NSS disabled support for TLS compression in version 3.33 and removed the
+ * code in a subsequent release. The API for retrieving information about
+ * compression as well as enabling it is kept for backwards compatibility, but
+ * we don't need to consult it since it was only available for SSLv3 which we
+ * don't support.
+ *
+ * https://bugzilla.mozilla.org/show_bug.cgi?id=1409587
+ */
+bool
+be_tls_get_compression(Port *port)
+{
+	return false;
+}
+
+/*
+ * be_tls_get_version
+ *
+ * Returns the protocol version used for the current connection, or NULL in
+ * case of errors.
+ */
+const char *
+be_tls_get_version(Port *port)
+{
+	SECStatus	status;
+	SSLChannelInfo channel;
+
+	status = SSL_GetChannelInfo(port->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+	{
+		ereport(WARNING,
+				(errmsg("unable to extract TLS session information: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+		return NULL;
+	}
+
+	return ssl_protocol_version_to_string(channel.protocolVersion);
+}
+
+const char *
+be_tls_get_cipher(Port *port)
+{
+	SECStatus	status;
+	SSLChannelInfo channel;
+	SSLCipherSuiteInfo suite;
+
+	status = SSL_GetChannelInfo(port->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+		goto error;
+
+	status = SSL_GetCipherSuiteInfo(channel.cipherSuite, &suite, sizeof(suite));
+	if (status != SECSuccess)
+		goto error;
+
+	return suite.cipherSuiteName;
+
+error:
+	ereport(WARNING,
+			(errmsg("unable to extract TLS session information: %s",
+					pg_SSLerrmessage(PR_GetError()))));
+	return NULL;
+}
+
+void
+be_tls_get_peer_subject_name(Port *port, char *ptr, size_t len)
+{
+	CERTCertificate *certificate;
+
+	certificate = SSL_PeerCertificate(port->pr_fd);
+	if (certificate)
+		strlcpy(ptr, CERT_NameToAscii(&certificate->subject), len);
+	else
+		ptr[0] = '\0';
+}
+
+void
+be_tls_get_peer_issuer_name(Port *port, char *ptr, size_t len)
+{
+	CERTCertificate *certificate;
+
+	certificate = SSL_PeerCertificate(port->pr_fd);
+	if (certificate)
+		strlcpy(ptr, CERT_NameToAscii(&certificate->issuer), len);
+	else
+		ptr[0] = '\0';
+}
+
+void
+be_tls_get_peer_serial(Port *port, char *ptr, size_t len)
+{
+	CERTCertificate *certificate;
+
+	certificate = SSL_PeerCertificate(port->pr_fd);
+	if (certificate)
+		snprintf(ptr, len, "%li", DER_GetInteger(&(certificate->serialNumber)));
+	else
+		ptr[0] = '\0';
+}
+
+char *
+be_tls_get_certificate_hash(Port *port, size_t *len)
+{
+	CERTCertificate *certificate;
+	SECOidTag	signature_tag;
+	SECOidTag	digest_alg;
+	int			digest_len;
+	SECStatus	status;
+	PLArenaPool *arena = NULL;
+	SECItem		digest;
+	char	   *ret;
+	PK11Context *ctx = NULL;
+	unsigned int outlen;
+
+	*len = 0;
+	certificate = SSL_LocalCertificate(port->pr_fd);
+	if (!certificate)
+		return NULL;
+
+	signature_tag = SECOID_GetAlgorithmTag(&certificate->signature);
+	if (!pg_find_signature_algorithm(signature_tag, &digest_alg, &digest_len))
+		elog(ERROR, "could not find digest for OID '%s'",
+			 SECOID_FindOIDTagDescription(signature_tag));
+
+	/*
+	 * The TLS server's certificate bytes need to be hashed with SHA-256 if
+	 * its signature algorithm is MD5 or SHA-1 as per RFC 5929
+	 * (https://tools.ietf.org/html/rfc5929#section-4.1).  If something else
+	 * is used, the same hash as the signature algorithm is used.
+	 */
+	if (digest_alg == SEC_OID_SHA1 || digest_alg == SEC_OID_MD5)
+	{
+		digest_alg = SEC_OID_SHA256;
+		digest_len = SHA256_LENGTH;
+	}
+
+	ctx = PK11_CreateDigestContext(digest_alg);
+	if (!ctx)
+		elog(ERROR, "out of memory");
+
+	arena = PORT_NewArena(SEC_ASN1_DEFAULT_ARENA_SIZE);
+	digest.data = PORT_ArenaZAlloc(arena, sizeof(unsigned char) * digest_len);
+	digest.len = digest_len;
+
+	status = SECSuccess;
+	status |= PK11_DigestBegin(ctx);
+	status |= PK11_DigestOp(ctx, certificate->derCert.data, certificate->derCert.len);
+	status |= PK11_DigestFinal(ctx, digest.data, &outlen, digest_len);
+
+	if (status != SECSuccess)
+	{
+		PORT_FreeArena(arena, PR_TRUE);
+		PK11_DestroyContext(ctx, PR_TRUE);
+		elog(ERROR, "could not generate server certificate hash");
+	}
+
+	ret = palloc(digest.len);
+	memcpy(ret, digest.data, digest.len);
+	*len = digest_len;
+
+	PORT_FreeArena(arena, PR_TRUE);
+	PK11_DestroyContext(ctx, PR_TRUE);
+
+	return ret;
+}
+
+/* ------------------------------------------------------------ */
+/*						Internal functions						*/
+/* ------------------------------------------------------------ */
+
+/*
+ * default_nss_tls_init
+ *
+ * The default TLS init hook function which users can override for installing
+ * their own passphrase callbacks and similar actions. In case no callback has
+ * been configured, or the callback isn't reload capable during a server
+ * reload, the dummy callback will be installed.
+ *
+ * The private data for the callback is set differently depending on how it's
+ * invoked. For calls which may invoke the callback deeper in the callstack
+ * the private data is set with SSL_SetPKCS11PinArg. When the call is directly
+ * invoking the callback, like PK11_FindCertFromNickname, then the private
+ * data is passed as a parameter. Setting the data with SSL_SetPKCS11PinArg is
+ * thus not required but good practice.
+ *
+ * NSS doesn't provide a default callback like OpenSSL does, but a callback is
+ * required to be set.  The password callback can be installed at any time, but
+ * setting the private data with SSL_SetPKCS11PinArg requires a PR Filedesc.
+ */
+static void
+default_nss_tls_init(bool isServerStart)
+{
+	/*
+	 * No user-defined callback has been configured, install the dummy call-
+	 * back since we must set something.
+	 */
+	if (!ssl_passphrase_command[0])
+		PK11_SetPasswordFunc(dummy_ssl_passphrase_cb);
+	else
+	{
+		/*
+		 * There is a user-defined callback, set it unless we are in a restart
+		 * and cannot handle restarts due to an interactive callback.
+		 */
+		if (isServerStart)
+			PK11_SetPasswordFunc(external_ssl_passphrase_cb);
+		else
+		{
+			if (ssl_passphrase_command_supports_reload)
+				PK11_SetPasswordFunc(external_ssl_passphrase_cb);
+			else
+				PK11_SetPasswordFunc(dummy_ssl_passphrase_cb);
+		}
+	}
+}
+
+/*
+ * external_ssl_passphrase_cb
+ *
+ * Runs the callback configured by ssl_passphrase_command and returns the
+ * captured password back to NSS.
+ */
+static char *
+external_ssl_passphrase_cb(PK11SlotInfo *slot, PRBool retry, void *arg)
+{
+	/*
+	 * NSS use a hardcoded 256 byte buffer for reading the password so set the
+	 * same limit for our callback buffer.
+	 */
+	char		buf[256];
+	int			len;
+	char	   *password = NULL;
+	char	   *prompt;
+
+	/*
+	 * Since there is no password callback in NSS when the server starts up,
+	 * it makes little sense to create an interactive callback. Thus, if this
+	 * is a retry attempt then give up immediately.
+	 */
+	if (retry)
+		return NULL;
+
+	/*
+	 * Construct the same prompt that NSS uses internally even though it is
+	 * unlikely to serve much purpose, but we must set a prompt so we might as
+	 * well do it right.
+	 */
+	prompt = psprintf("Enter Password or Pin for \"%s\":",
+					  PK11_GetTokenName(slot));
+
+	len = run_ssl_passphrase_command(prompt, ssl_is_server_start, buf, sizeof(buf));
+	pfree(prompt);
+
+	if (!len)
+		return NULL;
+
+	/*
+	 * At least one byte with password content was returned, and NSS requires
+	 * that we return it allocated in NSS controlled memory. If we fail to
+	 * allocate then abort without passing back NULL and bubble up the error
+	 * on the PG side.
+	 */
+	password = (char *) PR_Malloc(len + 1);
+	if (!password)
+	{
+		explicit_bzero(buf, sizeof(buf));
+		ereport(ERROR,
+				(errcode(ERRCODE_OUT_OF_MEMORY),
+				 errmsg("out of memory")));
+	}
+	strlcpy(password, buf, sizeof(password));
+	explicit_bzero(buf, sizeof(buf));
+
+	return password;
+}
+
+/*
+ * dummy_ssl_passphrase_cb
+ *
+ * Return unsuccessful if we are asked to provide the passphrase for a cert or
+ * key, without having a passphrase callback installed.
+ */
+static char *
+dummy_ssl_passphrase_cb(PK11SlotInfo *slot, PRBool retry, void *arg)
+{
+	dummy_ssl_passwd_cb_called = true;
+	return NULL;
+}
+
+static SECStatus
+pg_bad_cert_handler(void *arg, PRFileDesc *fd)
+{
+	Port	   *port = (Port *) arg;
+
+	port->peer_cert_valid = false;
+	return SECFailure;
+}
+
+/*
+ * raw_subject_common_name
+ *
+ * Returns the Subject Common Name for the given certificate as a raw char
+ * buffer (that is, without any form of escaping for unprintable characters or
+ * embedded nulls), with the length of the buffer returned in the len param.
+ * The buffer is allocated in the TopMemoryContext and is given a NULL
+ * terminator so that callers are safe to call strlen() on it.
+ *
+ * This is used instead of CERT_GetCommonName(), which always performs quoting
+ * and/or escaping. NSS doesn't appear to give us a way to easily unescape the
+ * result, and we need to store the raw CN into port->peer_cn for compatibility
+ * with the OpenSSL implementation.
+ */
+static char *
+raw_subject_common_name(CERTCertificate *cert, unsigned int *len)
+{
+	CERTName	subject = cert->subject;
+	CERTRDN	  **rdn;
+
+	for (rdn = subject.rdns; *rdn; rdn++)
+	{
+		CERTAVA	  **ava;
+
+		for (ava = (*rdn)->avas; *ava; ava++)
+		{
+			SECItem	   *buf;
+			char	   *cn;
+
+			if (CERT_GetAVATag(*ava) != SEC_OID_AVA_COMMON_NAME)
+				continue;
+
+			/* Found a CN, ecode and copy it into a newly allocated buffer */
+			buf = CERT_DecodeAVAValue(&(*ava)->value);
+			if (!buf)
+			{
+				/*
+				 * This failure case is difficult to test. (Since this code
+				 * runs after certificate authentication has otherwise
+				 * succeeded, you'd need to convince a CA implementation to
+				 * sign a corrupted certificate in order to get here.)
+				 *
+				 * Follow the behavior of CERT_GetCommonName() in this case and
+				 * simply return NULL, as if a Common Name had not been found.
+				 */
+				goto fail;
+			}
+
+			cn = MemoryContextAlloc(TopMemoryContext, buf->len + 1);
+			memcpy(cn, buf->data, buf->len);
+			cn[buf->len] = '\0';
+
+			*len = buf->len;
+
+			SECITEM_FreeItem(buf, PR_TRUE);
+			return cn;
+		}
+	}
+
+fail:
+	/* Not found. */
+	*len = 0;
+	return NULL;
+}
+
+/*
+ * pg_cert_auth_handler
+ *
+ * Callback for validation of incoming certificates. Returning SECFailure will
+ * cause NSS to terminate the connection immediately.
+ */
+static SECStatus
+pg_cert_auth_handler(void *arg, PRFileDesc *fd, PRBool checksig, PRBool isServer)
+{
+	SECStatus	status;
+	Port	   *port = (Port *) arg;
+	CERTCertificate *cert;
+	char	   *peer_cn;
+	unsigned int len;
+
+	status = SSL_AuthCertificate(CERT_GetDefaultCertDB(), port->pr_fd, checksig, PR_TRUE);
+	if (status != SECSuccess)
+		return status;
+
+	port->peer_cn = NULL;
+	port->peer_cert_valid = false;
+
+	cert = SSL_PeerCertificate(port->pr_fd);
+	if (!cert)
+	{
+		/* Shouldn't be possible; why did we get a client cert callback? */
+		Assert(cert != NULL);
+
+		PR_SetError(SEC_ERROR_LIBRARY_FAILURE, 0);
+		return SECFailure;
+	}
+
+	peer_cn = raw_subject_common_name(cert, &len);
+	if (!peer_cn)
+	{
+		/* No Common Name, but the certificate otherwise checks out. */
+		port->peer_cert_valid = true;
+
+		status = SECSuccess;
+		goto cleanup;
+	}
+
+	/*
+	 * Reject embedded NULLs in certificate common name to prevent attacks like
+	 * CVE-2009-4034.
+	 */
+	if (len != strlen(peer_cn))
+	{
+		ereport(COMMERROR,
+				(errcode(ERRCODE_PROTOCOL_VIOLATION),
+				 errmsg("SSL certificate's common name contains embedded null")));
+
+		pfree(peer_cn);
+		PR_SetError(SEC_ERROR_CERT_NOT_VALID, 0);
+
+		status = SECFailure;
+		goto cleanup;
+	}
+
+	port->peer_cn = peer_cn;
+	port->peer_cert_valid = true;
+
+	status = SECSuccess;
+
+cleanup:
+	CERT_DestroyCertificate(cert);
+	return status;
+}
+
+static PRInt32
+pg_ssl_read(PRFileDesc *fd, void *buf, PRInt32 amount, PRIntn flags,
+			PRIntervalTime timeout)
+{
+	PRRecvFN	read_fn;
+	PRInt32		n_read;
+
+	read_fn = fd->lower->methods->recv;
+	n_read = read_fn(fd->lower, buf, amount, flags, timeout);
+
+	return n_read;
+}
+
+static PRInt32
+pg_ssl_write(PRFileDesc *fd, const void *buf, PRInt32 amount, PRIntn flags,
+			 PRIntervalTime timeout)
+{
+	PRSendFN	send_fn;
+	PRInt32		n_write;
+
+	send_fn = fd->lower->methods->send;
+	n_write = send_fn(fd->lower, buf, amount, flags, timeout);
+
+	return n_write;
+}
+
+static PRStatus
+pg_ssl_close(PRFileDesc *fd)
+{
+	/*
+	 * Disconnect our private Port from the fd before closing out the stack.
+	 * (Debug builds of NSPR will assert if we do not.)
+	 */
+	fd->secret = NULL;
+	return PR_GetDefaultIOMethods()->close(fd);
+}
+
+static PRFileDesc *
+init_iolayer(Port *port)
+{
+	const		PRIOMethods *default_methods;
+	PRFileDesc *layer;
+
+	/*
+	 * Start by initializing our layer with all the default methods so that we
+	 * can selectively override the ones we want while still ensuring that we
+	 * have a complete layer specification.
+	 */
+	default_methods = PR_GetDefaultIOMethods();
+	memcpy(&pr_iomethods, default_methods, sizeof(PRIOMethods));
+
+	pr_iomethods.recv = pg_ssl_read;
+	pr_iomethods.send = pg_ssl_write;
+	pr_iomethods.close = pg_ssl_close;
+
+	/*
+	 * Each IO layer must be identified by a unique name, where uniqueness is
+	 * per connection. Each connection in a postgres cluster can generate the
+	 * identity from the same string as they will create their IO layers on
+	 * different sockets. Only one layer per socket can have the same name.
+	 */
+	pr_id = PR_GetUniqueIdentity("PostgreSQL Server");
+	if (pr_id == PR_INVALID_IO_LAYER)
+	{
+		ereport(ERROR,
+				(errmsg("out of memory when setting up TLS connection")));
+		return NULL;
+	}
+
+	/*
+	 * Create the actual IO layer as a stub such that it can be pushed onto
+	 * the layer stack. The step via a stub is required as we define custom
+	 * callbacks.
+	 */
+	layer = PR_CreateIOLayerStub(pr_id, &pr_iomethods);
+	if (!layer)
+	{
+		ereport(ERROR,
+				(errmsg("unable to create NSS I/O layer")));
+		return NULL;
+	}
+
+	/* Store the Port as private data available in callbacks */
+	layer->secret = (void *) port;
+
+	return layer;
+}
+
+static char *
+ssl_protocol_version_to_string(int v)
+{
+	switch (v)
+	{
+			/* SSL v2 and v3 are not supported */
+		case SSL_LIBRARY_VERSION_2:
+		case SSL_LIBRARY_VERSION_3_0:
+			Assert(false);
+			break;
+
+		case SSL_LIBRARY_VERSION_TLS_1_0:
+			return pstrdup("TLSv1.0");
+		case SSL_LIBRARY_VERSION_TLS_1_1:
+			return pstrdup("TLSv1.1");
+		case SSL_LIBRARY_VERSION_TLS_1_2:
+			return pstrdup("TLSv1.2");
+		case SSL_LIBRARY_VERSION_TLS_1_3:
+			return pstrdup("TLSv1.3");
+	}
+
+	return pstrdup("unknown");
+}
+
+
+/*
+ * ssl_protocol_version_to_nss
+ *			Translate PostgreSQL TLS version to NSS version
+ *
+ * Returns zero in case the requested TLS version is undefined (PG_ANY) and
+ * should be set by the caller, or -1 on failure.
+ */
+static uint16
+ssl_protocol_version_to_nss(int v, const char *guc_name)
+{
+	switch (v)
+	{
+			/*
+			 * There is no SSL_LIBRARY_ macro defined in NSS with the value
+			 * zero, so we use this to signal the caller that the highest
+			 * useful version should be set on the connection.
+			 */
+		case PG_TLS_ANY:
+			return 0;
+
+			/*
+			 * No guard is required here as there are no versions of NSS
+			 * without support for TLS1.
+			 */
+		case PG_TLS1_VERSION:
+			return SSL_LIBRARY_VERSION_TLS_1_0;
+		case PG_TLS1_1_VERSION:
+#ifdef SSL_LIBRARY_VERSION_TLS_1_1
+			return SSL_LIBRARY_VERSION_TLS_1_1;
+#else
+			break;
+#endif
+		case PG_TLS1_2_VERSION:
+#ifdef SSL_LIBRARY_VERSION_TLS_1_2
+			return SSL_LIBRARY_VERSION_TLS_1_2;
+#else
+			break;
+#endif
+		case PG_TLS1_3_VERSION:
+#ifdef SSL_LIBRARY_VERSION_TLS_1_3
+			return SSL_LIBRARY_VERSION_TLS_1_3;
+#else
+			break;
+#endif
+		default:
+			break;
+	}
+
+	return -1;
+}
+
+/*
+ * pg_SSLerrmessage
+ *		Create and return a human readable error message given
+ *		the specified error code
+ *
+ * PR_ErrorToName only converts the enum identifier of the error to string,
+ * but that can be quite useful for debugging (and in case PR_ErrorToString is
+ * unable to render a message then we at least have something).
+ */
+static char *
+pg_SSLerrmessage(PRErrorCode errcode)
+{
+	return psprintf("%s (%s)",
+					PR_ErrorToString(errcode, PR_LANGUAGE_I_DEFAULT),
+					PR_ErrorToName(errcode));
+}
+
+/*
+ * pg_SSLShutdownFunc
+ *		Callback for NSS shutdown
+ *
+ * If NSS is terminated from the outside when the connection is still in use
+ * we must treat this as potentially hostile and immediately close to avoid
+ * leaking the connection in any way. Once this is called, NSS will shutdown
+ * regardless so we may as well clean up the best we can. Returning SECFailure
+ * will cause the NSS shutdown to return with an error, but it will shutdown
+ * nevertheless. nss_data is reserved for future use and is always NULL.
+ */
+static SECStatus
+pg_SSLShutdownFunc(void *private_data, void *nss_data)
+{
+	Port *port = (Port *) private_data;
+
+	if (!port || !port->ssl_in_use)
+		return SECSuccess;
+
+	/*
+	 * There is a connection still open, close it and signal to whatever that
+	 * called the shutdown that it was erroneous.
+	 */
+	be_tls_close(port);
+	be_tls_destroy();
+
+	return SECFailure;
+}
diff --git a/src/backend/libpq/be-secure.c b/src/backend/libpq/be-secure.c
index 7155b33885..354d8e180b 100644
--- a/src/backend/libpq/be-secure.c
+++ b/src/backend/libpq/be-secure.c
@@ -49,6 +49,9 @@ bool		ssl_passphrase_command_supports_reload;
 #ifdef USE_SSL
 bool		ssl_loaded_verify_locations = false;
 #endif
+#ifdef USE_NSS
+char	   *ssl_database;
+#endif
 
 /* GUC variable controlling SSL cipher list */
 char	   *SSLCipherSuites = NULL;
diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c
index eafdb1118e..b023b31c46 100644
--- a/src/backend/utils/misc/guc.c
+++ b/src/backend/utils/misc/guc.c
@@ -4308,7 +4308,11 @@ static struct config_string ConfigureNamesString[] =
 		},
 		&ssl_library,
 #ifdef USE_SSL
+#if defined(USE_OPENSSL)
 		"OpenSSL",
+#elif defined(USE_NSS)
+		"NSS",
+#endif
 #else
 		"",
 #endif
@@ -4366,6 +4370,18 @@ static struct config_string ConfigureNamesString[] =
 		check_canonical_path, assign_pgstat_temp_directory, NULL
 	},
 
+#ifdef USE_NSS
+	{
+		{"ssl_database", PGC_SIGHUP, CONN_AUTH_SSL,
+			gettext_noop("Location of the NSS certificate database."),
+			NULL
+		},
+		&ssl_database,
+		"",
+		NULL, NULL, NULL
+	},
+#endif
+
 	{
 		{"synchronous_standby_names", PGC_SIGHUP, REPLICATION_PRIMARY,
 			gettext_noop("Number of synchronous standbys and list of names of potential synchronous ones."),
@@ -4394,8 +4410,10 @@ static struct config_string ConfigureNamesString[] =
 			GUC_SUPERUSER_ONLY
 		},
 		&SSLCipherSuites,
-#ifdef USE_OPENSSL
+#if defined(USE_OPENSSL)
 		"HIGH:MEDIUM:+3DES:!aNULL",
+#elif defined (USE_NSS)
+		"",
 #else
 		"none",
 #endif
diff --git a/src/common/cipher_nss.c b/src/common/cipher_nss.c
new file mode 100644
index 0000000000..9799fef32d
--- /dev/null
+++ b/src/common/cipher_nss.c
@@ -0,0 +1,192 @@
+/*-------------------------------------------------------------------------
+ *
+ * cipher_nss.c
+ *	  NSS functionality shared between frontend and backend for working
+ *	  with ciphers
+ *
+ * This should only bse used if code is compiled with NSS support.
+ *
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ *        src/common/cipher_nss.c
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#ifndef FRONTEND
+#include "postgres.h"
+#else
+#include "postgres_fe.h"
+#endif
+
+#include "common/nss.h"
+
+#define INVALID_CIPHER	0xFFFF
+
+typedef struct
+{
+	SECOidTag	signature;
+	SECOidTag	hash;
+	int			len;
+}			NSSSignatureAlgorithm;
+
+static const NSSSignatureAlgorithm NSS_SCRAMDigestAlgorithm[] = {
+
+	{SEC_OID_PKCS1_MD5_WITH_RSA_ENCRYPTION, SEC_OID_SHA256, SHA256_LENGTH},
+	{SEC_OID_PKCS1_SHA1_WITH_RSA_ENCRYPTION, SEC_OID_SHA256, SHA256_LENGTH},
+	{SEC_OID_ISO_SHA_WITH_RSA_SIGNATURE, SEC_OID_SHA256, SHA256_LENGTH},
+	{SEC_OID_ISO_SHA1_WITH_RSA_SIGNATURE, SEC_OID_SHA256, SHA256_LENGTH},
+	{SEC_OID_PKCS5_PBE_WITH_MD5_AND_DES_CBC, SEC_OID_SHA256, SHA256_LENGTH},
+
+	{SEC_OID_ANSIX962_ECDSA_SHA224_SIGNATURE, SEC_OID_SHA224, SHA224_LENGTH},
+	{SEC_OID_PKCS1_SHA224_WITH_RSA_ENCRYPTION, SEC_OID_SHA224, SHA224_LENGTH},
+	{SEC_OID_NIST_DSA_SIGNATURE_WITH_SHA224_DIGEST, SEC_OID_SHA224, SHA224_LENGTH},
+
+	{SEC_OID_ANSIX962_ECDSA_SHA256_SIGNATURE, SEC_OID_SHA256, SHA256_LENGTH},
+	{SEC_OID_PKCS1_SHA256_WITH_RSA_ENCRYPTION, SEC_OID_SHA256, SHA256_LENGTH},
+	{SEC_OID_NIST_DSA_SIGNATURE_WITH_SHA256_DIGEST, SEC_OID_SHA256, SHA256_LENGTH},
+
+	{SEC_OID_ANSIX962_ECDSA_SHA384_SIGNATURE, SEC_OID_SHA384, SHA384_LENGTH},
+	{SEC_OID_PKCS1_SHA384_WITH_RSA_ENCRYPTION, SEC_OID_SHA384, SHA384_LENGTH},
+
+	{SEC_OID_ANSIX962_ECDSA_SHA512_SIGNATURE, SEC_OID_SHA512, SHA512_LENGTH},
+	{SEC_OID_PKCS1_SHA512_WITH_RSA_ENCRYPTION, SEC_OID_SHA512, SHA512_LENGTH},
+
+	{0, 0}
+};
+
+typedef struct
+{
+	const char *name;
+	PRUint16	number;
+}			NSSCiphers;
+
+/*
+ * This list is a partial copy of the ciphers in NSS files lib/ssl/sslproto.h
+ * in order to provide a human readable version of the ciphers. It would be
+ * nice to not have to have this, but NSS doesn't provide any API addressing
+ * the ciphers by name. TODO: do we want more of the ciphers, or perhaps less?
+ */
+static const NSSCiphers NSS_CipherList[] = {
+
+	{"TLS_NULL_WITH_NULL_NULL", TLS_NULL_WITH_NULL_NULL},
+
+	{"TLS_RSA_WITH_NULL_MD5", TLS_RSA_WITH_NULL_MD5},
+	{"TLS_RSA_WITH_NULL_SHA", TLS_RSA_WITH_NULL_SHA},
+	{"TLS_RSA_WITH_RC4_128_MD5", TLS_RSA_WITH_RC4_128_MD5},
+	{"TLS_RSA_WITH_RC4_128_SHA", TLS_RSA_WITH_RC4_128_SHA},
+	{"TLS_RSA_WITH_IDEA_CBC_SHA", TLS_RSA_WITH_IDEA_CBC_SHA},
+	{"TLS_RSA_WITH_DES_CBC_SHA", TLS_RSA_WITH_DES_CBC_SHA},
+	{"TLS_RSA_WITH_3DES_EDE_CBC_SHA", TLS_RSA_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_DH_DSS_WITH_DES_CBC_SHA", TLS_DH_DSS_WITH_DES_CBC_SHA},
+	{"TLS_DH_DSS_WITH_3DES_EDE_CBC_SHA", TLS_DH_DSS_WITH_3DES_EDE_CBC_SHA},
+	{"TLS_DH_RSA_WITH_DES_CBC_SHA", TLS_DH_RSA_WITH_DES_CBC_SHA},
+	{"TLS_DH_RSA_WITH_3DES_EDE_CBC_SHA", TLS_DH_RSA_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_DHE_DSS_WITH_DES_CBC_SHA", TLS_DHE_DSS_WITH_DES_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_3DES_EDE_CBC_SHA", TLS_DHE_DSS_WITH_3DES_EDE_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_DES_CBC_SHA", TLS_DHE_RSA_WITH_DES_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA", TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_DH_anon_WITH_RC4_128_MD5", TLS_DH_anon_WITH_RC4_128_MD5},
+	{"TLS_DH_anon_WITH_DES_CBC_SHA", TLS_DH_anon_WITH_DES_CBC_SHA},
+	{"TLS_DH_anon_WITH_3DES_EDE_CBC_SHA", TLS_DH_anon_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_RSA_WITH_AES_128_CBC_SHA", TLS_RSA_WITH_AES_128_CBC_SHA},
+	{"TLS_DH_DSS_WITH_AES_128_CBC_SHA", TLS_DH_DSS_WITH_AES_128_CBC_SHA},
+	{"TLS_DH_RSA_WITH_AES_128_CBC_SHA", TLS_DH_RSA_WITH_AES_128_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_AES_128_CBC_SHA", TLS_DHE_DSS_WITH_AES_128_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_AES_128_CBC_SHA", TLS_DHE_RSA_WITH_AES_128_CBC_SHA},
+	{"TLS_DH_anon_WITH_AES_128_CBC_SHA", TLS_DH_anon_WITH_AES_128_CBC_SHA},
+
+	{"TLS_RSA_WITH_AES_256_CBC_SHA", TLS_RSA_WITH_AES_256_CBC_SHA},
+	{"TLS_DH_DSS_WITH_AES_256_CBC_SHA", TLS_DH_DSS_WITH_AES_256_CBC_SHA},
+	{"TLS_DH_RSA_WITH_AES_256_CBC_SHA", TLS_DH_RSA_WITH_AES_256_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_AES_256_CBC_SHA", TLS_DHE_DSS_WITH_AES_256_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_AES_256_CBC_SHA", TLS_DHE_RSA_WITH_AES_256_CBC_SHA},
+	{"TLS_DH_anon_WITH_AES_256_CBC_SHA", TLS_DH_anon_WITH_AES_256_CBC_SHA},
+	{"TLS_RSA_WITH_NULL_SHA256", TLS_RSA_WITH_NULL_SHA256},
+	{"TLS_RSA_WITH_AES_128_CBC_SHA256", TLS_RSA_WITH_AES_128_CBC_SHA256},
+	{"TLS_RSA_WITH_AES_256_CBC_SHA256", TLS_RSA_WITH_AES_256_CBC_SHA256},
+
+	{"TLS_DHE_DSS_WITH_AES_128_CBC_SHA256", TLS_DHE_DSS_WITH_AES_128_CBC_SHA256},
+	{"TLS_RSA_WITH_CAMELLIA_128_CBC_SHA", TLS_RSA_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DH_DSS_WITH_CAMELLIA_128_CBC_SHA", TLS_DH_DSS_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DH_RSA_WITH_CAMELLIA_128_CBC_SHA", TLS_DH_RSA_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_CAMELLIA_128_CBC_SHA", TLS_DHE_DSS_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA", TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DH_anon_WITH_CAMELLIA_128_CBC_SHA", TLS_DH_anon_WITH_CAMELLIA_128_CBC_SHA},
+
+	{"TLS_DHE_DSS_WITH_RC4_128_SHA", TLS_DHE_DSS_WITH_RC4_128_SHA},
+	{"TLS_DHE_RSA_WITH_AES_128_CBC_SHA256", TLS_DHE_RSA_WITH_AES_128_CBC_SHA256},
+	{"TLS_DHE_DSS_WITH_AES_256_CBC_SHA256", TLS_DHE_DSS_WITH_AES_256_CBC_SHA256},
+	{"TLS_DHE_RSA_WITH_AES_256_CBC_SHA256", TLS_DHE_RSA_WITH_AES_256_CBC_SHA256},
+
+	{"TLS_RSA_WITH_CAMELLIA_256_CBC_SHA", TLS_RSA_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DH_DSS_WITH_CAMELLIA_256_CBC_SHA", TLS_DH_DSS_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DH_RSA_WITH_CAMELLIA_256_CBC_SHA", TLS_DH_RSA_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_CAMELLIA_256_CBC_SHA", TLS_DHE_DSS_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA", TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DH_anon_WITH_CAMELLIA_256_CBC_SHA", TLS_DH_anon_WITH_CAMELLIA_256_CBC_SHA},
+
+	{"TLS_RSA_WITH_SEED_CBC_SHA", TLS_RSA_WITH_SEED_CBC_SHA},
+
+	{"TLS_RSA_WITH_AES_128_GCM_SHA256", TLS_RSA_WITH_AES_128_GCM_SHA256},
+	{"TLS_RSA_WITH_AES_256_GCM_SHA384", TLS_RSA_WITH_AES_256_GCM_SHA384},
+	{"TLS_DHE_RSA_WITH_AES_128_GCM_SHA256", TLS_DHE_RSA_WITH_AES_128_GCM_SHA256},
+	{"TLS_DHE_RSA_WITH_AES_256_GCM_SHA384", TLS_DHE_RSA_WITH_AES_256_GCM_SHA384},
+	{"TLS_DHE_DSS_WITH_AES_128_GCM_SHA256", TLS_DHE_DSS_WITH_AES_128_GCM_SHA256},
+	{"TLS_DHE_DSS_WITH_AES_256_GCM_SHA384", TLS_DHE_DSS_WITH_AES_256_GCM_SHA384},
+
+	{"TLS_AES_128_GCM_SHA256", TLS_AES_128_GCM_SHA256},
+	{"TLS_AES_256_GCM_SHA384", TLS_AES_256_GCM_SHA384},
+	{"TLS_CHACHA20_POLY1305_SHA256", TLS_CHACHA20_POLY1305_SHA256},
+	{NULL, 0}
+};
+
+/*
+ * pg_find_cipher
+ *			Translate an NSS ciphername to the cipher code
+ *
+ * Searches the configured ciphers for the corresponding cipher code to the
+ * name. Search is performed case insensitive.
+ */
+bool
+pg_find_cipher(char *name, PRUint16 *cipher)
+{
+	const		NSSCiphers *cipher_list;
+
+	for (cipher_list = NSS_CipherList; cipher_list->name; cipher_list++)
+	{
+		if (pg_strcasecmp(cipher_list->name, name) == 0)
+		{
+			*cipher = cipher_list->number;
+			return true;
+		}
+	}
+
+	return false;
+}
+
+bool
+pg_find_signature_algorithm(SECOidTag signature, SECOidTag *algorithm, int *len)
+{
+	const NSSSignatureAlgorithm *candidate;
+
+	candidate = NSS_SCRAMDigestAlgorithm;
+
+	for (candidate = NSS_SCRAMDigestAlgorithm; candidate->signature; candidate++)
+	{
+		if (signature == candidate->signature)
+		{
+			*algorithm = candidate->hash;
+			*len = candidate->len;
+			return true;
+		}
+	}
+
+	return false;
+}
diff --git a/src/include/common/nss.h b/src/include/common/nss.h
new file mode 100644
index 0000000000..a361dd1f68
--- /dev/null
+++ b/src/include/common/nss.h
@@ -0,0 +1,49 @@
+/*-------------------------------------------------------------------------
+ *
+ * nss.h
+ *	  NSS supporting functionality shared between frontend and backend
+ *
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ *		  src/include/common/nss.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef COMMON_NSS_H
+#define COMMON_NSS_H
+
+#ifdef USE_NSS
+
+/*
+ * BITS_PER_BYTE is also defined in the NSPR header files, so we need to undef
+ * our version to avoid compiler warnings on redefinition.
+ */
+#define pg_BITS_PER_BYTE BITS_PER_BYTE
+#undef BITS_PER_BYTE
+/*
+ * The nspr/obsolete/protypes.h NSPR header typedefs uint64 and int64 with
+ * colliding definitions from ours, causing a much expected compiler error.
+ * Remove backwards compatibility with ancient NSPR versions to avoid this.
+ */
+#define NO_NSPR_10_SUPPORT
+#include <nspr/nspr.h>
+#include <nspr/prerror.h>
+#include <nspr/prio.h>
+#include <nspr/prmem.h>
+#include <nspr/prtypes.h>
+
+
+#include <nss/nss.h>
+#include <nss/hasht.h>
+#include <nss/secoidt.h>
+#include <nss/sslproto.h>
+
+/* src/common/cipher_nss.c */
+bool pg_find_cipher(char *name, PRUint16 *cipher);
+bool pg_find_signature_algorithm(SECOidTag signature, SECOidTag *digest, int *len);
+
+#endif							/* USE_NSS */
+
+#endif							/* COMMON_NSS_H */
diff --git a/src/include/libpq/libpq-be.h b/src/include/libpq/libpq-be.h
index 7be1a67d69..eb00d9152b 100644
--- a/src/include/libpq/libpq-be.h
+++ b/src/include/libpq/libpq-be.h
@@ -200,6 +200,10 @@ typedef struct Port
 	SSL		   *ssl;
 	X509	   *peer;
 #endif
+
+#ifdef USE_NSS
+	void	   *pr_fd;
+#endif
 } Port;
 
 #ifdef USE_SSL
@@ -283,7 +287,7 @@ extern void be_tls_get_peer_serial(Port *port, char *ptr, size_t len);
  * This is not supported with old versions of OpenSSL that don't have
  * the X509_get_signature_nid() function.
  */
-#if defined(USE_OPENSSL) && defined(HAVE_X509_GET_SIGNATURE_NID)
+#if defined(USE_NSS) || (defined(USE_OPENSSL) && defined(HAVE_X509_GET_SIGNATURE_NID))
 #define HAVE_BE_TLS_GET_CERTIFICATE_HASH
 extern char *be_tls_get_certificate_hash(Port *port, size_t *len);
 #endif
@@ -293,6 +297,10 @@ extern char *be_tls_get_certificate_hash(Port *port, size_t *len);
 typedef void (*openssl_tls_init_hook_typ) (SSL_CTX *context, bool isServerStart);
 extern PGDLLIMPORT openssl_tls_init_hook_typ openssl_tls_init_hook;
 #endif
+#ifdef USE_NSS
+typedef void (*nss_tls_init_hook_type) (bool isServerStart);
+extern PGDLLIMPORT nss_tls_init_hook_type nss_tls_init_hook;
+#endif
 
 #endif							/* USE_SSL */
 
diff --git a/src/include/libpq/libpq.h b/src/include/libpq/libpq.h
index a55898c85a..d2860b852f 100644
--- a/src/include/libpq/libpq.h
+++ b/src/include/libpq/libpq.h
@@ -88,6 +88,9 @@ extern PGDLLIMPORT bool ssl_passphrase_command_supports_reload;
 #ifdef USE_SSL
 extern bool ssl_loaded_verify_locations;
 #endif
+#ifdef USE_NSS
+extern char *ssl_database;
+#endif
 
 extern int	secure_initialize(bool isServerStart);
 extern bool secure_loaded_verify_locations(void);
diff --git a/src/include/pg_config_manual.h b/src/include/pg_config_manual.h
index 2a12071bad..7861b94290 100644
--- a/src/include/pg_config_manual.h
+++ b/src/include/pg_config_manual.h
@@ -178,7 +178,7 @@
  * USE_SSL code should be compiled only when compiling with an SSL
  * implementation.
  */
-#ifdef USE_OPENSSL
+#if defined(USE_OPENSSL) || defined(USE_NSS)
 #define USE_SSL
 #endif
 
diff --git a/src/interfaces/libpq/fe-connect.c b/src/interfaces/libpq/fe-connect.c
index 8ca0583aa9..1eeeff54a8 100644
--- a/src/interfaces/libpq/fe-connect.c
+++ b/src/interfaces/libpq/fe-connect.c
@@ -355,6 +355,10 @@ static const internalPQconninfoOption PQconninfoOptions[] = {
 		"Target-Session-Attrs", "", 11, /* sizeof("read-write") = 11 */
 	offsetof(struct pg_conn, target_session_attrs)},
 
+	{"cert_database", NULL, NULL, NULL,
+		"CertificateDatabase", "", 64,
+	offsetof(struct pg_conn, cert_database)},
+
 	/* Terminating entry --- MUST BE LAST */
 	{NULL, NULL, NULL, NULL,
 	NULL, NULL, 0}
diff --git a/src/interfaces/libpq/fe-secure-nss.c b/src/interfaces/libpq/fe-secure-nss.c
new file mode 100644
index 0000000000..0548264f52
--- /dev/null
+++ b/src/interfaces/libpq/fe-secure-nss.c
@@ -0,0 +1,1096 @@
+/*-------------------------------------------------------------------------
+ *
+ * fe-secure-nss.c
+ *	  functions for supporting NSS as a TLS backend for frontend libpq
+ *
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ *	  src/interfaces/libpq/fe-secure-nss.c
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#include "postgres_fe.h"
+
+#include "libpq-fe.h"
+#include "fe-auth.h"
+#include "fe-secure-common.h"
+#include "libpq-int.h"
+#include "common/nss.h"
+
+/*
+ * The nspr/obsolete/protypes.h NSPR header typedefs uint64 and int64 with
+ * colliding definitions from ours, causing a much expected compiler error.
+ * Remove backwards compatibility with ancient NSPR versions to avoid this.
+ */
+#define NO_NSPR_10_SUPPORT
+#include <nspr/nspr.h>
+#include <nspr/prerror.h>
+#include <nspr/prinit.h>
+#include <nspr/prio.h>
+
+#include <nss/hasht.h>
+#include <nss/nss.h>
+#include <nss/ssl.h>
+#include <nss/sslproto.h>
+#include <nss/pk11func.h>
+#include <nss/secerr.h>
+#include <nss/secoidt.h>
+#include <nss/secmod.h>
+
+static SECStatus pg_load_nss_module(SECMODModule **module, const char *library, const char *name);
+static SECStatus pg_bad_cert_handler(void *arg, PRFileDesc *fd);
+static const char *pg_SSLerrmessage(PRErrorCode errcode);
+static SECStatus pg_client_auth_handler(void *arg, PRFileDesc *socket, CERTDistNames *caNames,
+										CERTCertificate **pRetCert, SECKEYPrivateKey **pRetKey);
+static SECStatus pg_cert_auth_handler(void *arg, PRFileDesc *fd, PRBool checksig, PRBool isServer);
+static int	ssl_protocol_version_to_nss(const char *protocol);
+static bool cert_database_has_CA(PGconn *conn);
+
+static char *PQssl_passwd_cb(PK11SlotInfo *slot, PRBool retry, void *arg);
+
+/*
+ * PR_ImportTCPSocket() is a private API, but very widely used, as it's the
+ * only way to make NSS use an already set up POSIX file descriptor rather
+ * than opening one itself. To quote the NSS documentation:
+ *
+ *		"In theory, code that uses PR_ImportTCPSocket may break when NSPR's
+ *		implementation changes. In practice, this is unlikely to happen because
+ *		NSPR's implementation has been stable for years and because of NSPR's
+ *		strong commitment to backward compatibility."
+ *
+ * https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSPR/Reference/PR_ImportTCPSocket
+ *
+ * The function is declared in <private/pprio.h>, but as it is a header marked
+ * private we declare it here rather than including it.
+ */
+NSPR_API(PRFileDesc *) PR_ImportTCPSocket(int);
+
+static SECMODModule *ca_trust = NULL;
+
+/*
+ * This logic exist in NSS as well, but it's only available for when there is
+ * a database to open, and not only using the system trust store. Thus, we
+ * need to keep our own copy.
+ */
+#if defined(WIN32)
+static const char *ca_trust_name = "nssckbi.dll";
+#elif defined(__darwin__)
+static const char *ca_trust_name = "libnssckbi.dylib";
+#else
+static const char *ca_trust_name = "libnssckbi.so";
+#endif
+
+static PQsslKeyPassHook_nss_type PQsslKeyPassHook = NULL;
+
+/* ------------------------------------------------------------ */
+/*			 Procedures common to all secure sessions			*/
+/* ------------------------------------------------------------ */
+
+/*
+ * pgtls_init_library
+ *
+ * There is no direct equivalent for PQinitOpenSSL in NSS/NSPR, with PR_Init
+ * being the closest match there is. PR_Init is however already documented to
+ * not be required so simply making this a noop seems like the best option.
+ */
+void
+pgtls_init_library(bool do_ssl, int do_crypto)
+{
+	/* noop */
+}
+
+int
+pgtls_init(PGconn *conn)
+{
+	conn->nss_context = NULL;
+
+	conn->ssl_in_use = false;
+	conn->has_password = false;
+
+	return 0;
+}
+
+void
+pgtls_close(PGconn *conn)
+{
+	if (conn->nss_context)
+	{
+		NSS_ShutdownContext(conn->nss_context);
+		conn->nss_context = NULL;
+	}
+}
+
+PostgresPollingStatusType
+pgtls_open_client(PGconn *conn)
+{
+	SECStatus	status;
+	PRFileDesc *pr_fd;
+	PRFileDesc *model;
+	NSSInitParameters params;
+	SSLVersionRange desired_range;
+
+	/*
+	 * The NSPR documentation states that runtime initialization via PR_Init
+	 * is no longer required, as the first caller into NSPR will perform the
+	 * initialization implicitly. See be-secure-nss.c for further discussion
+	 * on PR_Init.
+	 */
+	PR_Init(PR_USER_THREAD, PR_PRIORITY_NORMAL, 0);
+
+	/*
+	 * NSS initialization and the use of contexts is further discussed in
+	 * be-secure-nss.c
+	 */
+	memset(&params, 0, sizeof(params));
+	params.length = sizeof(params);
+
+	if (conn->cert_database && strlen(conn->cert_database) > 0)
+	{
+		char	   *cert_database_path = psprintf("sql:%s", conn->cert_database);
+
+		conn->nss_context = NSS_InitContext(cert_database_path, "", "", "",
+											&params,
+											NSS_INIT_READONLY | NSS_INIT_PK11RELOAD);
+		pfree(cert_database_path);
+
+		if (!conn->nss_context)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("unable to open certificate database \"%s\": %s"),
+							  conn->cert_database,
+							  pg_SSLerrmessage(PR_GetError()));
+			return PGRES_POLLING_FAILED;
+		}
+	}
+	else
+	{
+		conn->nss_context = NSS_InitContext("", "", "", "", &params,
+											NSS_INIT_READONLY | NSS_INIT_NOCERTDB |
+											NSS_INIT_NOMODDB | NSS_INIT_FORCEOPEN |
+											NSS_INIT_NOROOTINIT | NSS_INIT_PK11RELOAD);
+		if (!conn->nss_context)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("unable to create certificate database: %s"),
+							  pg_SSLerrmessage(PR_GetError()));
+			return PGRES_POLLING_FAILED;
+		}
+	}
+
+	/*
+	 * Configure cipher policy.
+	 */
+	status = NSS_SetDomesticPolicy();
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to configure cipher policy: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * If we don't have a certificate database, the system trust store is the
+	 * fallback we can use. If we fail to initialize that as well, we can
+	 * still attempt a connection as long as the sslmode isn't verify*.
+	 */
+	if (!conn->cert_database && conn->sslmode[0] == 'v')
+	{
+		status = pg_load_nss_module(&ca_trust, ca_trust_name, "\"Root Certificates\"");
+		if (status != SECSuccess)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("WARNING: unable to load NSS trust module \"%s\" : %s"),
+							  ca_trust_name,
+							  pg_SSLerrmessage(PR_GetError()));
+
+			return PGRES_POLLING_FAILED;
+		}
+	}
+
+
+	PK11_SetPasswordFunc(PQssl_passwd_cb);
+
+	/*
+	 * Import the already opened socket as we don't want to use NSPR functions
+	 * for opening the network socket due to how the PostgreSQL protocol works
+	 * with TLS connections. This function is not part of the NSPR public API,
+	 * see the comment at the top of the file for the rationale of still using
+	 * it.
+	 */
+	pr_fd = PR_ImportTCPSocket(conn->sock);
+	if (!pr_fd)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to attach to socket: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * Most of the documentation available, and implementations of, NSS/NSPR
+	 * use the PR_NewTCPSocket() function here, which has the drawback that it
+	 * can only create IPv4 sockets. Instead use PR_OpenTCPSocket() which
+	 * copes with IPv6 as well.
+	 */
+	model = SSL_ImportFD(NULL, PR_OpenTCPSocket(conn->laddr.addr.ss_family));
+	if (!model)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to enable TLS: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/* Disable old protocol versions (SSLv2 and SSLv3) */
+	SSL_OptionSet(model, SSL_ENABLE_SSL2, PR_FALSE);
+	SSL_OptionSet(model, SSL_V2_COMPATIBLE_HELLO, PR_FALSE);
+	SSL_OptionSet(model, SSL_ENABLE_SSL3, PR_FALSE);
+
+#ifdef SSL_CBC_RANDOM_IV
+
+	/*
+	 * Enable protection against the BEAST attack in case the NSS library has
+	 * support for that. While SSLv3 is disabled, we may still allow TLSv1
+	 * which is affected. The option isn't documented as an SSL option, but as
+	 * an NSS environment variable.
+	 */
+	SSL_OptionSet(model, SSL_CBC_RANDOM_IV, PR_TRUE);
+#endif
+
+	/* Set us up as a TLS client for the handshake */
+	SSL_OptionSet(model, SSL_HANDSHAKE_AS_CLIENT, PR_TRUE);
+
+	/*
+	 * When setting the available protocols, we either use the user defined
+	 * configuration values, and if missing we accept whatever is the highest
+	 * version supported by the library as the max and only limit the range in
+	 * the other end at TLSv1.0. ssl_variant_stream is a ProtocolVariant enum
+	 * for Stream protocols, rather than datagram.
+	 */
+	SSL_VersionRangeGetSupported(ssl_variant_stream, &desired_range);
+	desired_range.min = SSL_LIBRARY_VERSION_TLS_1_0;
+
+	if (conn->ssl_min_protocol_version && strlen(conn->ssl_min_protocol_version) > 0)
+	{
+		int			ssl_min_ver = ssl_protocol_version_to_nss(conn->ssl_min_protocol_version);
+
+		if (ssl_min_ver == -1)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("invalid value \"%s\" for minimum version of SSL protocol\n"),
+							  conn->ssl_min_protocol_version);
+			return -1;
+		}
+
+		desired_range.min = ssl_min_ver;
+	}
+
+	if (conn->ssl_max_protocol_version && strlen(conn->ssl_max_protocol_version) > 0)
+	{
+		int			ssl_max_ver = ssl_protocol_version_to_nss(conn->ssl_max_protocol_version);
+
+		if (ssl_max_ver == -1)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("invalid value \"%s\" for maximum version of SSL protocol\n"),
+							  conn->ssl_max_protocol_version);
+			return -1;
+		}
+
+		desired_range.max = ssl_max_ver;
+	}
+
+	if (SSL_VersionRangeSet(model, &desired_range) != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to set allowed SSL protocol version range: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * Set up callback for verifying server certificates, as well as for how
+	 * to handle failed verifications.
+	 */
+	SSL_AuthCertificateHook(model, pg_cert_auth_handler, (void *) conn);
+	SSL_BadCertHook(model, pg_bad_cert_handler, (void *) conn);
+
+	/*
+	 * Convert the NSPR socket to an SSL socket. Ensuring the success of this
+	 * operation is critical as NSS SSL_* functions may return SECSuccess on
+	 * the socket even though SSL hasn't been enabled, which introduce a risk
+	 * of silent downgrades.
+	 */
+	conn->pr_fd = SSL_ImportFD(model, pr_fd);
+	if (!conn->pr_fd)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to configure client for TLS: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * The model can now we closed as we've applied the settings of the model
+	 * onto the real socket. From hereon we should only use conn->pr_fd.
+	 */
+	PR_Close(model);
+
+	/* Set the private data to be passed to the password callback */
+	SSL_SetPKCS11PinArg(conn->pr_fd, (void *) conn);
+
+	/*
+	 * If a CRL file has been specified, verify if it exists in the database
+	 * but don't fail in case it doesn't.
+	 */
+	if (conn->sslcrl && strlen(conn->sslcrl) > 0)
+	{
+		printfPQExpBuffer(&conn->
+		/* XXX: Implement me.. */
+	}
+
+	status = SSL_ResetHandshake(conn->pr_fd, PR_FALSE);
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to initiate handshake: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/* Set callback for client authentication when requested by the server */
+	SSL_GetClientAuthDataHook(conn->pr_fd, pg_client_auth_handler, (void *) conn);
+
+	/*
+	 * Specify which hostname we are expecting to talk to. This is required,
+	 * albeit mostly applies to when opening a connection to a traditional
+	 * http server it seems.
+	 */
+	SSL_SetURL(conn->pr_fd, (conn->connhost[conn->whichhost]).host);
+
+	do
+	{
+		status = SSL_ForceHandshake(conn->pr_fd);
+	}
+	while (status != SECSuccess && PR_GetError() == PR_WOULD_BLOCK_ERROR);
+
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("SSL error: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	conn->ssl_in_use = true;
+	return PGRES_POLLING_OK;
+}
+
+ssize_t
+pgtls_read(PGconn *conn, void *ptr, size_t len)
+{
+	PRInt32		nread;
+	PRErrorCode status;
+	int			read_errno = 0;
+
+	/*
+	 * PR_Recv blocks until there is data to read or the timeout expires. We
+	 * don't want to sit blocked here, so the timeout is turned off by using
+	 * PR_INTERVAL_NO_WAIT which means "return immediately",  Zero is returned
+	 * for closed connections, while -1 indicates an error within the ongoing
+	 * connection.
+	 */
+	nread = PR_Recv(conn->pr_fd, ptr, len, 0, PR_INTERVAL_NO_WAIT);
+
+	if (nread == 0)
+	{
+		read_errno = ECONNRESET;
+		nread = -1;
+	}
+	else if (nread == -1)
+	{
+		status = PR_GetError();
+
+		switch (status)
+		{
+			case PR_IO_TIMEOUT_ERROR:
+				/* No data available yet. */
+				nread = 0;
+				break;
+
+			case PR_WOULD_BLOCK_ERROR:
+				read_errno = EWOULDBLOCK;
+				break;
+
+				/*
+				 * The error cases for PR_Recv are not documented, but can be
+				 * reverse engineered from _MD_unix_map_default_error() in the
+				 * NSPR code, defined in pr/src/md/unix/unix_errors.c.
+				 */
+			case PR_NETWORK_UNREACHABLE_ERROR:
+			case PR_CONNECT_RESET_ERROR:
+				read_errno = ECONNRESET;
+				break;
+
+			default:
+				break;
+		}
+
+		if (nread == -1)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("TLS read error: %s"),
+							  pg_SSLerrmessage(status));
+		}
+	}
+
+	SOCK_ERRNO_SET(read_errno);
+	return (ssize_t) nread;
+}
+
+/*
+ * pgtls_read_pending
+ *		Check for the existence of data to be read.
+ *
+ * This is part of the PostgreSQL TLS backend API.
+ */
+bool
+pgtls_read_pending(PGconn *conn)
+{
+	unsigned char c;
+	int			n;
+
+	/*
+	 * PR_Recv peeks into the stream with the timeount turned off, to see if
+	 * there is another byte to read off the wire. There is an NSS function
+	 * SSL_DataPending() which might seem like a better fit, but it will only
+	 * check already encrypted data in the SSL buffer, not still unencrypted
+	 * data, thus it doesn't guarantee that a subsequent call to
+	 * PR_Read/PR_Recv won't block.
+	 */
+	n = PR_Recv(conn->pr_fd, &c, 1, PR_MSG_PEEK, PR_INTERVAL_NO_WAIT);
+	return (n > 0);
+}
+
+ssize_t
+pgtls_write(PGconn *conn, const void *ptr, size_t len)
+{
+	PRInt32		n;
+	PRErrorCode status;
+	int			write_errno = 0;
+
+	n = PR_Write(conn->pr_fd, ptr, len);
+
+	if (n < 0)
+	{
+		status = PR_GetError();
+
+		switch (status)
+		{
+			case PR_WOULD_BLOCK_ERROR:
+#ifdef EAGAIN
+				write_errno = EAGAIN;
+#else
+				write_errno = EINTR;
+#endif
+				break;
+
+			default:
+				printfPQExpBuffer(&conn->errorMessage,
+								  libpq_gettext("TLS write error: %s"),
+								  pg_SSLerrmessage(status));
+				write_errno = ECONNRESET;
+				break;
+		}
+	}
+
+	SOCK_ERRNO_SET(write_errno);
+	return (ssize_t) n;
+}
+
+char *
+pgtls_get_peer_certificate_hash(PGconn *conn, size_t *len)
+{
+	CERTCertificate *server_cert;
+	SECOidTag	signature_tag;
+	SECOidTag	digest_alg;
+	int			digest_len;
+	PLArenaPool *arena;
+	SECItem		digest;
+	char	   *ret;
+	SECStatus	status;
+
+	*len = 0;
+
+	server_cert = SSL_PeerCertificate(conn->pr_fd);
+	if (!server_cert)
+		return NULL;
+
+	signature_tag = SECOID_GetAlgorithmTag(&server_cert->signature);
+	if (!pg_find_signature_algorithm(signature_tag, &digest_alg, &digest_len))
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("could not find digest for OID '%s'\n"),
+						  SECOID_FindOIDTagDescription(signature_tag));
+		return NULL;
+	}
+
+	arena = PORT_NewArena(SEC_ASN1_DEFAULT_ARENA_SIZE);
+	digest.data = PORT_ArenaZAlloc(arena, sizeof(unsigned char) * digest_len);
+	digest.len = digest_len;
+
+	status = PK11_HashBuf(digest_alg, digest.data, server_cert->derCert.data,
+						  server_cert->derCert.len);
+
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to generate peer certificate digest: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		PORT_FreeArena(arena, PR_TRUE);
+		return NULL;
+	}
+
+	ret = pg_malloc(digest.len);
+	memcpy(ret, digest.data, digest.len);
+	*len = digest_len;
+	PORT_FreeArena(arena, PR_TRUE);
+
+	return ret;
+}
+
+/*
+ *	Verify that the server certificate matches the hostname we connected to.
+ *
+ * The certificate's Common Name and Subject Alternative Names are considered.
+ */
+int
+pgtls_verify_peer_name_matches_certificate_guts(PGconn *conn,
+												int *names_examined,
+												char **first_name)
+{
+	char	   *server_hostname = NULL;
+	CERTCertificate *server_cert = NULL;
+	SECStatus	status = SECSuccess;
+	SECItem		altname_item;
+	PLArenaPool *arena = NULL;
+	CERTGeneralName *san_list;
+	CERTGeneralName *cn;
+
+	server_hostname = SSL_RevealURL(conn->pr_fd);
+	if (!server_hostname || server_hostname[0] == '\0')
+		goto done;
+
+	/*
+	 * CERT_VerifyCertName will internally perform RFC 2818 SubjectAltName
+	 * verification.
+	 */
+	server_cert = SSL_PeerCertificate(conn->pr_fd);
+	status = CERT_VerifyCertName(server_cert, server_hostname);
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to verify server hostname: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		goto done;
+	}
+
+	status = CERT_FindCertExtension(server_cert, SEC_OID_X509_SUBJECT_ALT_NAME,
+									&altname_item);
+	if (status == SECSuccess)
+	{
+		arena = PORT_NewArena(DER_DEFAULT_CHUNKSIZE);
+		if (!arena)
+		{
+			status = SECFailure;
+			goto done;
+		}
+		san_list = CERT_DecodeAltNameExtension(arena, &altname_item);
+		if (!san_list)
+		{
+			status = SECFailure;
+			goto done;
+		}
+
+		for (cn = san_list; cn != san_list; cn = CERT_GetNextGeneralName(cn))
+		{
+			char	   *alt_name;
+			int			rv;
+			char		tmp[512];
+
+			status = CERT_RFC1485_EscapeAndQuote(tmp, sizeof(tmp),
+												 (char *) cn->name.other.data,
+												 cn->name.other.len);
+
+			if (status != SECSuccess)
+				goto done;
+
+			rv = pq_verify_peer_name_matches_certificate_name(conn, tmp,
+															  strlen(tmp),
+															  &alt_name);
+			if (alt_name)
+			{
+				if (!*first_name)
+					*first_name = alt_name;
+				else
+					free(alt_name);
+			}
+
+			if (rv == 1)
+				status = SECSuccess;
+			else
+			{
+				status = SECFailure;
+				break;
+			}
+		}
+	}
+	else if (PORT_GetError() == SEC_ERROR_EXTENSION_NOT_FOUND)
+		status = SECSuccess;
+	else
+		status = SECSuccess;
+
+done:
+	/* san_list will be freed by freeing the arena it was allocated in */
+	if (arena)
+		PORT_FreeArena(arena, PR_TRUE);
+	PR_Free(server_hostname);
+
+	if (status == SECSuccess)
+		return 1;
+
+	return 0;
+}
+
+/* ------------------------------------------------------------ */
+/*			PostgreSQL specific TLS support functions			*/
+/* ------------------------------------------------------------ */
+
+static const char *
+pg_SSLerrmessage(PRErrorCode errcode)
+{
+	const char *error;
+
+	/*
+	 * Try to get the user friendly error description, and if that fails try
+	 * to fall back on the name of the PRErrorCode.
+	 */
+	error = PR_ErrorToString(errcode, PR_LANGUAGE_I_DEFAULT);
+	if (!error)
+		error = PR_ErrorToName(errcode);
+	if (error)
+		return error;
+
+	return "unknown TLS error";
+}
+
+static SECStatus
+pg_load_nss_module(SECMODModule * *module, const char *library, const char *name)
+{
+	SECMODModule *mod;
+	char	   *modulespec;
+
+	modulespec = psprintf("library=\"%s\", name=\"%s\"", library, name);
+
+	/*
+	 * Attempt to load the specified module. The second parameter is "parent"
+	 * which should always be NULL for application code. The third parameter
+	 * defines if loading should recurse which is only applicable when loading
+	 * a module from within another module. This hierarchy would have to be
+	 * defined in the modulespec, and since we don't support anything but
+	 * directly addressed modules we should pass PR_FALSE.
+	 */
+	mod = SECMOD_LoadUserModule(modulespec, NULL, PR_FALSE);
+	pfree(modulespec);
+
+	if (mod && mod->loaded)
+	{
+		*module = mod;
+		return SECSuccess;
+	}
+
+	SECMOD_DestroyModule(mod);
+	return SECFailure;
+}
+
+/* ------------------------------------------------------------ */
+/*						NSS Callbacks							*/
+/* ------------------------------------------------------------ */
+
+/*
+ * pg_cert_auth_handler
+ *			Callback for authenticating server certificate
+ *
+ * This is pretty much the same procedure as the SSL_AuthCertificate function
+ * provided by NSS, with the difference being server hostname validation. With
+ * SSL_AuthCertificate there is no way to do verify-ca, it only does the -full
+ * flavor of our sslmodes, so we need our own implementation.
+ */
+static SECStatus
+pg_cert_auth_handler(void *arg, PRFileDesc *fd, PRBool checksig, PRBool isServer)
+{
+	SECStatus	status;
+	PGconn	   *conn = (PGconn *) arg;
+	CERTCertificate *server_cert;
+	void	   *pin;
+
+	Assert(!isServer);
+
+	pin = SSL_RevealPinArg(conn->pr_fd);
+	server_cert = SSL_PeerCertificate(conn->pr_fd);
+
+	/*
+	 * VerifyCertificateNow verifies the validity using PR_now from NSPR as a
+	 * timestamp and will perform CRL and OSCP revocation checks. conn->sslcrl
+	 * does not impact NSS connections as any CRL in the NSS database will be
+	 * used automatically.
+	 */
+	status = CERT_VerifyCertificateNow((CERTCertDBHandle *) CERT_GetDefaultCertDB(),
+									   server_cert,
+									   checksig,
+									   certificateUsageSSLServer,
+									   pin,
+									   NULL);
+
+	/*
+	 * If we've already failed validation then there is no point in also
+	 * performing the hostname check for verify-full.
+	 */
+	if (status == SECSuccess)
+	{
+		if (!pq_verify_peer_name_matches_certificate(conn))
+			status = SECFailure;
+	}
+	else
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to verify certificate: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+	}
+
+	return status;
+}
+
+/*
+ * pg_client_auth_handler
+ *		Callback for client certificate validation
+ *
+ * The client auth callback is not on by default in NSS, so we need to invoke
+ * it ourselves to ensure we can do cert authentication. A TODO is to support
+ * running without a specified sslcert parameter. By retrieving all the certs
+ * via nickname from the cert database and see if we find one which apply with
+ * NSS_CmpCertChainWCANames() and PK11_FindKeyByAnyCert() we could support
+ * just running with a ssl database specified.
+ *
+ * For now, we use the default client certificate validation which requires a
+ * defined nickname to identify the cert in the database.
+ */
+static SECStatus
+pg_client_auth_handler(void *arg, PRFileDesc * socket, CERTDistNames * caNames,
+					   CERTCertificate * *pRetCert, SECKEYPrivateKey * *pRetKey)
+{
+	PGconn	   *conn = (PGconn *) arg;
+
+	return NSS_GetClientAuthData(conn->sslcert, socket, caNames, pRetCert, pRetKey);
+}
+
+/*
+ * pg_bad_cert_handler
+ *		Callback for failed certificate validation
+ *
+ * The TLS handshake will call this function iff the server certificate failed
+ * validation. Depending on the sslmode, we allow the connection anyways.
+ */
+static SECStatus
+pg_bad_cert_handler(void *arg, PRFileDesc * fd)
+{
+	PGconn	   *conn = (PGconn *) arg;
+	PRErrorCode err;
+
+	/*
+	 * This really shouldn't happen, as we've set the PGconn object as our
+	 * callback data, and at the callsite we know it will be populated. That
+	 * being said, the NSS code itself performs this check even when it should
+	 * not be required so let's use the same belts with our suspenders.
+	 */
+	if (!arg)
+		return SECFailure;
+
+	/*
+	 * For sslmodes other than verify-full and verify-ca we don't perform peer
+	 * validation, so return immediately.  sslmode require with a database
+	 * specified which contains a CA certificate will work like verify-ca to
+	 * be compatible with the OpenSSL implementation.
+	 */
+	if (strcmp(conn->sslmode, "require") == 0)
+	{
+		if (conn->cert_database && strlen(conn->cert_database) > 0 && cert_database_has_CA(conn))
+			return SECFailure;
+	}
+	if (conn->sslmode[0] == 'v')
+		return SECFailure;
+
+	err = PORT_GetError();
+
+	/*
+	 * TODO: these are relevant error codes that can occur in certificate
+	 * validation, figure out which we don't want for require/prefer etc.
+	 */
+	switch (err)
+	{
+		case SEC_ERROR_INVALID_AVA:
+		case SEC_ERROR_INVALID_TIME:
+		case SEC_ERROR_BAD_SIGNATURE:
+		case SEC_ERROR_EXPIRED_CERTIFICATE:
+		case SEC_ERROR_UNKNOWN_ISSUER:
+		case SEC_ERROR_UNTRUSTED_ISSUER:
+		case SEC_ERROR_UNTRUSTED_CERT:
+		case SEC_ERROR_CERT_VALID:
+		case SEC_ERROR_EXPIRED_ISSUER_CERTIFICATE:
+		case SEC_ERROR_CRL_EXPIRED:
+		case SEC_ERROR_CRL_BAD_SIGNATURE:
+		case SEC_ERROR_EXTENSION_VALUE_INVALID:
+		case SEC_ERROR_CA_CERT_INVALID:
+		case SEC_ERROR_CERT_USAGES_INVALID:
+		case SEC_ERROR_UNKNOWN_CRITICAL_EXTENSION:
+			return SECSuccess;
+			break;
+		default:
+			return SECFailure;
+			break;
+	}
+
+	/* Unreachable */
+	return SECSuccess;
+}
+
+/* ------------------------------------------------------------ */
+/*					SSL information functions					*/
+/* ------------------------------------------------------------ */
+
+/*
+ * PQgetssl
+ *
+ * Return NULL as this is legacy and defined to always be equal to calling
+ * PQsslStruct(conn, "OpenSSL"); This should ideally trigger a logged warning
+ * somewhere as it's nonsensical to run in a non-OpenSSL build.
+ */
+void *
+PQgetssl(PGconn *conn)
+{
+	return NULL;
+}
+
+void *
+PQsslStruct(PGconn *conn, const char *struct_name)
+{
+	if (!conn)
+		return NULL;
+
+	/*
+	 * Return the underlying PRFileDesc which can be used to access
+	 * information on the connection details. There is no SSL context per se.
+	 */
+	if (strcmp(struct_name, "NSS") == 0)
+		return conn->pr_fd;
+	return NULL;
+}
+
+const char *const *
+PQsslAttributeNames(PGconn *conn)
+{
+	static const char *const result[] = {
+		"library",
+		"cipher",
+		"protocol",
+		"key_bits",
+		"compression",
+		NULL
+	};
+
+	return result;
+}
+
+const char *
+PQsslAttribute(PGconn *conn, const char *attribute_name)
+{
+	SECStatus	status;
+	SSLChannelInfo channel;
+	SSLCipherSuiteInfo suite;
+
+	if (!conn || !conn->pr_fd)
+		return NULL;
+
+	if (strcmp(attribute_name, "library") == 0)
+		return "NSS";
+
+	status = SSL_GetChannelInfo(conn->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+		return NULL;
+
+	status = SSL_GetCipherSuiteInfo(channel.cipherSuite, &suite, sizeof(suite));
+	if (status != SECSuccess)
+		return NULL;
+
+	if (strcmp(attribute_name, "cipher") == 0)
+		return suite.cipherSuiteName;
+
+	if (strcmp(attribute_name, "key_bits") == 0)
+	{
+		static char key_bits_str[8];
+
+		snprintf(key_bits_str, sizeof(key_bits_str), "%i", suite.effectiveKeyBits);
+		return key_bits_str;
+	}
+
+	if (strcmp(attribute_name, "protocol") == 0)
+	{
+		switch (channel.protocolVersion)
+		{
+#ifdef SSL_LIBRARY_VERSION_TLS_1_3
+			case SSL_LIBRARY_VERSION_TLS_1_3:
+				return "TLSv1.3";
+#endif
+#ifdef SSL_LIBRARY_VERSION_TLS_1_2
+			case SSL_LIBRARY_VERSION_TLS_1_2:
+				return "TLSv1.2";
+#endif
+#ifdef SSL_LIBRARY_VERSION_TLS_1_1
+			case SSL_LIBRARY_VERSION_TLS_1_1:
+				return "TLSv1.1";
+#endif
+			case SSL_LIBRARY_VERSION_TLS_1_0:
+				return "TLSv1.0";
+			default:
+				return "unknown";
+		}
+	}
+
+	/*
+	 * NSS disabled support for compression in version 3.33, and it was only
+	 * available for SSLv3 at that point anyways, so we can safely return off
+	 * here without checking.
+	 */
+	if (strcmp(attribute_name, "compression") == 0)
+		return "off";
+
+	return NULL;
+}
+
+static int
+ssl_protocol_version_to_nss(const char *protocol)
+{
+	if (pg_strcasecmp("TLSv1", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_0;
+
+#ifdef SSL_LIBRARY_VERSION_TLS_1_1
+	if (pg_strcasecmp("TLSv1.1", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_1;
+#endif
+
+#ifdef SSL_LIBRARY_VERSION_TLS_1_2
+	if (pg_strcasecmp("TLSv1.2", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_2;
+#endif
+
+#ifdef SSL_LIBRARY_VERSION_TLS_1_3
+	if (pg_strcasecmp("TLSv1.3", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_3;
+#endif
+
+	return -1;
+}
+
+/*
+ * cert_database_has_CA
+ *		 Check for the presence of a CA certificate
+ *
+ * Returns true in case there is a CA certificate in the database connected
+ * to in the conn object, else false. This function only checks for the
+ * presence of a CA certificate, not it's validity and/or usefulness.
+ */
+static bool
+cert_database_has_CA(PGconn *conn)
+{
+	CERTCertList *certificates;
+	bool		hasCA;
+
+	/*
+	 * If the certificate database has a password we must provide it, since
+	 * this API doesn't invoke the standard password callback.
+	 */
+	if (conn->has_password)
+		certificates = PK11_ListCerts(PK11CertListCA, PQssl_passwd_cb(NULL, PR_FALSE, (void *) conn));
+	else
+		certificates = PK11_ListCerts(PK11CertListCA, NULL);
+	hasCA = !CERT_LIST_EMPTY(certificates);
+	CERT_DestroyCertList(certificates);
+
+	return hasCA;
+}
+
+PQsslKeyPassHook_nss_type
+PQgetSSLKeyPassHook_nss(void)
+{
+	return PQsslKeyPassHook;
+}
+
+void
+PQsetSSLKeyPassHook_nss(PQsslKeyPassHook_nss_type hook)
+{
+	PQsslKeyPassHook = hook;
+}
+
+/*
+ * PQssl_passwd_cb
+ *		 Supply a password to decrypt an object
+ *
+ * If an object in the NSS database is password protected, or if the entire
+ * NSS database is itself password protected, this callback will be invoked.
+ *
+ * This must match NSS type PK11PasswordFunc.
+ */
+static char *
+PQssl_passwd_cb(PK11SlotInfo *slot, PRBool retry, void *arg)
+{
+	PGconn	   *conn = (PGconn *) arg;
+
+	conn->has_password = true;
+
+	if (PQsslKeyPassHook)
+		return PQsslKeyPassHook(slot, (PRBool) retry, arg);
+	else
+		return PQdefaultSSLKeyPassHook_nss(slot, retry, arg);
+}
+
+/*
+ * PQdefaultSSLKeyPassHook_nss
+ * 		 Default password handler callback
+ *
+ * If no user defined password callback has been set up, the callback below
+ * will try the password set by the sslpassword parameter. Since we by legacy
+ * only have support for a single password, there is little reason to inspect
+ * the slot for the object in question. A TODO is to support different
+ * passwords for different objects, either via a DSL in sslpassword or with a
+ * new key/value style parameter. Users can supply their own password hook to
+ * do this of course, but it would be nice to support something in core too.
+ */
+char *
+PQdefaultSSLKeyPassHook_nss(PK11SlotInfo * slot, PRBool retry, void *arg)
+{
+	PGconn	   *conn = (PGconn *) arg;
+
+	/*
+	 * If the password didn't work the first time there is no point in
+	 * retrying as it hasn't changed.
+	 */
+	if (retry != PR_TRUE && conn->sslpassword && strlen(conn->sslpassword) > 0)
+		return PORT_Strdup(conn->sslpassword);
+
+	return NULL;
+}
diff --git a/src/interfaces/libpq/fe-secure.c b/src/interfaces/libpq/fe-secure.c
index c601071838..7f10da3010 100644
--- a/src/interfaces/libpq/fe-secure.c
+++ b/src/interfaces/libpq/fe-secure.c
@@ -448,6 +448,27 @@ PQdefaultSSLKeyPassHook_OpenSSL(char *buf, int size, PGconn *conn)
 }
 #endif							/* USE_OPENSSL */
 
+#ifndef USE_NSS
+
+PQsslKeyPassHook_nss_type
+PQgetSSLKeyPassHook_nss(void)
+{
+	return NULL;
+}
+
+void
+PQsetSSLKeyPassHook_nss(PQsslKeyPassHook_nss_type hook)
+{
+	return;
+}
+
+char *
+PQdefaultSSLKeyPassHook_nss(PK11SlotInfo * slot, PRBool retry, void *arg)
+{
+	return NULL;
+}
+#endif							/* USE_NSS */
+
 /* Dummy version of GSSAPI information functions, when built without GSS support */
 #ifndef ENABLE_GSS
 
diff --git a/src/interfaces/libpq/libpq-fe.h b/src/interfaces/libpq/libpq-fe.h
index effe0ccf85..aba32e6635 100644
--- a/src/interfaces/libpq/libpq-fe.h
+++ b/src/interfaces/libpq/libpq-fe.h
@@ -625,6 +625,17 @@ extern PQsslKeyPassHook_OpenSSL_type PQgetSSLKeyPassHook_OpenSSL(void);
 extern void PQsetSSLKeyPassHook_OpenSSL(PQsslKeyPassHook_OpenSSL_type hook);
 extern int	PQdefaultSSLKeyPassHook_OpenSSL(char *buf, int size, PGconn *conn);
 
+/* == in fe-secure-nss.c === */
+typedef struct PK11SlotInfoStr PK11SlotInfo;
+typedef int PRIntn;
+typedef PRIntn PRBool;
+
+/* Support for overriding sslpassword handling with a callback */
+typedef char *(*PQsslKeyPassHook_nss_type) (PK11SlotInfo *slot, PRBool retry, void *arg);
+extern PQsslKeyPassHook_nss_type PQgetSSLKeyPassHook_nss(void);
+extern void PQsetSSLKeyPassHook_nss(PQsslKeyPassHook_nss_type hook);
+extern char *PQdefaultSSLKeyPassHook_nss(PK11SlotInfo *slot, PRBool retry, void *arg);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/src/interfaces/libpq/libpq-int.h b/src/interfaces/libpq/libpq-int.h
index 4db498369c..c6f84096a0 100644
--- a/src/interfaces/libpq/libpq-int.h
+++ b/src/interfaces/libpq/libpq-int.h
@@ -362,6 +362,7 @@ struct pg_conn
 	char	   *sslpassword;	/* client key file password */
 	char	   *sslrootcert;	/* root certificate filename */
 	char	   *sslcrl;			/* certificate revocation list filename */
+	char	   *cert_database;	/* NSS certificate/key database */
 	char	   *requirepeer;	/* required peer credentials for local sockets */
 	char	   *gssencmode;		/* GSS mode (require,prefer,disable) */
 	char	   *krbsrvname;		/* Kerberos service name */
@@ -485,6 +486,28 @@ struct pg_conn
 								 * OpenSSL version changes */
 #endif
 #endif							/* USE_OPENSSL */
+
+/*
+ * The NSS/NSPR specific types aren't used to avoid pulling in the required
+ * headers here, as they are causing conflicts with PG definitions.
+ */
+#ifdef USE_NSS
+	void	   *nss_context;	/* NSS connection specific context */
+	void	   *pr_fd;			/* NSPR file descriptor for the connection */
+
+	/*
+	 * Track whether the NSS database has a password set or not. There is no
+	 * API function for retrieving password status of a database, but we need
+	 * to know since some NSS API calls require the password passed in (they
+	 * don't call the callback themselves). To track, we simply flip this to
+	 * true in case NSS invoked the password callback - as that will only
+	 * happen in case there is a password. The reason for tracking this is
+	 * that there are calls which require a password parameter, but doesn't
+	 * use the callbacks provided, so we must call the callback on behalf of
+	 * these.
+	 */
+	bool		has_password;
+#endif							/* USE_NSS */
 #endif							/* USE_SSL */
 
 #ifdef ENABLE_GSS
@@ -759,7 +782,7 @@ extern ssize_t pgtls_write(PGconn *conn, const void *ptr, size_t len);
  * This is not supported with old versions of OpenSSL that don't have
  * the X509_get_signature_nid() function.
  */
-#if defined(USE_OPENSSL) && defined(HAVE_X509_GET_SIGNATURE_NID)
+#if defined(USE_NSS) || (defined(USE_OPENSSL) && defined(HAVE_X509_GET_SIGNATURE_NID))
 #define HAVE_PGTLS_GET_PEER_CERTIFICATE_HASH
 extern char *pgtls_get_peer_certificate_hash(PGconn *conn, size_t *len);
 #endif
-- 
2.21.1 (Apple Git-122.3)

From 35bf6312fb855d4dd18da3614d0c6b5881e4157d Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Mon, 8 Feb 2021 23:52:55 +0100
Subject: [PATCH v28 9/9] nss: Build infrastructure

Finally this adds the infrastructure to build a postgres installation
with libnss support.
---
 configure                     | 294 +++++++++++++++++++++++++++++++++-
 configure.ac                  |  31 +++-
 src/backend/libpq/Makefile    |   4 +
 src/common/Makefile           |   6 +
 src/include/pg_config.h.in    |  12 ++
 src/interfaces/libpq/Makefile |   5 +
 src/tools/msvc/Install.pm     |   3 +-
 src/tools/msvc/Mkvcbuild.pm   |  39 ++++-
 src/tools/msvc/Solution.pm    |  20 +++
 9 files changed, 402 insertions(+), 12 deletions(-)

diff --git a/configure b/configure
index ce9ea36999..143726c79c 100755
--- a/configure
+++ b/configure
@@ -654,6 +654,8 @@ UUID_LIBS
 LDAP_LIBS_BE
 LDAP_LIBS_FE
 with_ssl
+NSPR_CONFIG
+NSS_CONFIG
 PTHREAD_CFLAGS
 PTHREAD_LIBS
 PTHREAD_CC
@@ -1570,7 +1572,7 @@ Optional Packages:
                           use system time zone data in DIR
   --without-zlib          do not use Zlib
   --with-gnu-ld           assume the C compiler uses GNU ld [default=no]
-  --with-ssl=LIB          use LIB for SSL/TLS support (openssl)
+  --with-ssl=LIB          use LIB for SSL/TLS support (openssl, nss)
   --with-openssl          obsolete spelling of --with-ssl=openssl
 
 Some influential environment variables:
@@ -12462,8 +12464,274 @@ done
 
 $as_echo "#define USE_OPENSSL 1" >>confdefs.h
 
+elif test "$with_ssl" = nss ; then
+  # TODO: fallback in case nss-config/nspr-config aren't found.
+  if test -z "$NSS_CONFIG"; then
+  for ac_prog in nss-config
+do
+  # Extract the first word of "$ac_prog", so it can be a program name with args.
+set dummy $ac_prog; ac_word=$2
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
+$as_echo_n "checking for $ac_word... " >&6; }
+if ${ac_cv_path_NSS_CONFIG+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  case $NSS_CONFIG in
+  [\\/]* | ?:[\\/]*)
+  ac_cv_path_NSS_CONFIG="$NSS_CONFIG" # Let the user override the test with a path.
+  ;;
+  *)
+  as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH
+do
+  IFS=$as_save_IFS
+  test -z "$as_dir" && as_dir=.
+    for ac_exec_ext in '' $ac_executable_extensions; do
+  if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
+    ac_cv_path_NSS_CONFIG="$as_dir/$ac_word$ac_exec_ext"
+    $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
+    break 2
+  fi
+done
+  done
+IFS=$as_save_IFS
+
+  ;;
+esac
+fi
+NSS_CONFIG=$ac_cv_path_NSS_CONFIG
+if test -n "$NSS_CONFIG"; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $NSS_CONFIG" >&5
+$as_echo "$NSS_CONFIG" >&6; }
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+fi
+
+
+  test -n "$NSS_CONFIG" && break
+done
+
+else
+  # Report the value of NSS_CONFIG in configure's output in all cases.
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for NSS_CONFIG" >&5
+$as_echo_n "checking for NSS_CONFIG... " >&6; }
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $NSS_CONFIG" >&5
+$as_echo "$NSS_CONFIG" >&6; }
+fi
+
+  if test -z "$NSPR_CONFIG"; then
+  for ac_prog in nspr-config
+do
+  # Extract the first word of "$ac_prog", so it can be a program name with args.
+set dummy $ac_prog; ac_word=$2
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
+$as_echo_n "checking for $ac_word... " >&6; }
+if ${ac_cv_path_NSPR_CONFIG+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  case $NSPR_CONFIG in
+  [\\/]* | ?:[\\/]*)
+  ac_cv_path_NSPR_CONFIG="$NSPR_CONFIG" # Let the user override the test with a path.
+  ;;
+  *)
+  as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH
+do
+  IFS=$as_save_IFS
+  test -z "$as_dir" && as_dir=.
+    for ac_exec_ext in '' $ac_executable_extensions; do
+  if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
+    ac_cv_path_NSPR_CONFIG="$as_dir/$ac_word$ac_exec_ext"
+    $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
+    break 2
+  fi
+done
+  done
+IFS=$as_save_IFS
+
+  ;;
+esac
+fi
+NSPR_CONFIG=$ac_cv_path_NSPR_CONFIG
+if test -n "$NSPR_CONFIG"; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $NSPR_CONFIG" >&5
+$as_echo "$NSPR_CONFIG" >&6; }
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+fi
+
+
+  test -n "$NSPR_CONFIG" && break
+done
+
+else
+  # Report the value of NSPR_CONFIG in configure's output in all cases.
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for NSPR_CONFIG" >&5
+$as_echo_n "checking for NSPR_CONFIG... " >&6; }
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $NSPR_CONFIG" >&5
+$as_echo "$NSPR_CONFIG" >&6; }
+fi
+
+  if test -n "$NSS_CONFIG"; then
+    NSS_LIBS=`$NSS_CONFIG --libs`
+	NSS_CFLAGS=`$NSS_CONFIG --cflags`
+  fi
+  if test -n "$NSPR_CONFIG"; then
+	NSPR_LIBS=`$NSPR_CONFIG --libs`
+	NSPR_CFLAGS=`$NSPR_CONFIG --cflags`
+  fi
+
+  LDFLAGS="$LDFLAGS $NSS_LIBS $NSPR_LIBS"
+  CFLAGS="$CFLAGS $NSS_CFLAGS $NSPR_CFLAGS"
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for NSS_InitContext in -lnss3" >&5
+$as_echo_n "checking for NSS_InitContext in -lnss3... " >&6; }
+if ${ac_cv_lib_nss3_NSS_InitContext+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lnss3  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char NSS_InitContext ();
+int
+main ()
+{
+return NSS_InitContext ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_lib_nss3_NSS_InitContext=yes
+else
+  ac_cv_lib_nss3_NSS_InitContext=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_nss3_NSS_InitContext" >&5
+$as_echo "$ac_cv_lib_nss3_NSS_InitContext" >&6; }
+if test "x$ac_cv_lib_nss3_NSS_InitContext" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_LIBNSS3 1
+_ACEOF
+
+  LIBS="-lnss3 $LIBS"
+
+else
+  as_fn_error $? "library 'nss3' is required for NSS" "$LINENO" 5
+fi
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for PR_GetDefaultIOMethods in -lnspr4" >&5
+$as_echo_n "checking for PR_GetDefaultIOMethods in -lnspr4... " >&6; }
+if ${ac_cv_lib_nspr4_PR_GetDefaultIOMethods+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lnspr4  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char PR_GetDefaultIOMethods ();
+int
+main ()
+{
+return PR_GetDefaultIOMethods ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_lib_nspr4_PR_GetDefaultIOMethods=yes
+else
+  ac_cv_lib_nspr4_PR_GetDefaultIOMethods=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_nspr4_PR_GetDefaultIOMethods" >&5
+$as_echo "$ac_cv_lib_nspr4_PR_GetDefaultIOMethods" >&6; }
+if test "x$ac_cv_lib_nspr4_PR_GetDefaultIOMethods" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_LIBNSPR4 1
+_ACEOF
+
+  LIBS="-lnspr4 $LIBS"
+
+else
+  as_fn_error $? "library 'nspr4' is required for NSS" "$LINENO" 5
+fi
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for SSL_GetImplementedCiphers in -lssl3" >&5
+$as_echo_n "checking for SSL_GetImplementedCiphers in -lssl3... " >&6; }
+if ${ac_cv_lib_ssl3_SSL_GetImplementedCiphers+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lssl3  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char SSL_GetImplementedCiphers ();
+int
+main ()
+{
+return SSL_GetImplementedCiphers ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_lib_ssl3_SSL_GetImplementedCiphers=yes
+else
+  ac_cv_lib_ssl3_SSL_GetImplementedCiphers=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_ssl3_SSL_GetImplementedCiphers" >&5
+$as_echo "$ac_cv_lib_ssl3_SSL_GetImplementedCiphers" >&6; }
+if test "x$ac_cv_lib_ssl3_SSL_GetImplementedCiphers" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_LIBSSL3 1
+_ACEOF
+
+  LIBS="-lssl3 $LIBS"
+
+else
+  as_fn_error $? "library 'ssl3' is required for NSS" "$LINENO" 5
+fi
+
+
+$as_echo "#define USE_NSS 1" >>confdefs.h
+
 elif test "$with_ssl" != no ; then
-  as_fn_error $? "--with-ssl must specify openssl" "$LINENO" 5
+  as_fn_error $? "--with-ssl must specify one of openssl or nss" "$LINENO" 5
 fi
 
 
@@ -13369,6 +13637,23 @@ else
 fi
 
 
+elif test "$with_ssl" = nss ; then
+  ac_fn_c_check_header_mongrel "$LINENO" "nss/ssl.h" "ac_cv_header_nss_ssl_h" "$ac_includes_default"
+if test "x$ac_cv_header_nss_ssl_h" = xyes; then :
+
+else
+  as_fn_error $? "header file <nss/ssl.h> is required for NSS" "$LINENO" 5
+fi
+
+
+  ac_fn_c_check_header_mongrel "$LINENO" "nss/nss.h" "ac_cv_header_nss_nss_h" "$ac_includes_default"
+if test "x$ac_cv_header_nss_nss_h" = xyes; then :
+
+else
+  as_fn_error $? "header file <nss/nss.h> is required for NSS" "$LINENO" 5
+fi
+
+
 fi
 
 if test "$with_pam" = yes ; then
@@ -18131,6 +18416,9 @@ $as_echo_n "checking which random number source to use... " >&6; }
 if test x"$with_ssl" = x"openssl" ; then
   { $as_echo "$as_me:${as_lineno-$LINENO}: result: OpenSSL" >&5
 $as_echo "OpenSSL" >&6; }
+elif test x"$with_ssl" = x"nss" ; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: NSS" >&5
+$as_echo "NSS" >&6; }
 elif test x"$PORTNAME" = x"win32" ; then
   { $as_echo "$as_me:${as_lineno-$LINENO}: result: Windows native" >&5
 $as_echo "Windows native" >&6; }
@@ -18160,7 +18448,7 @@ fi
   if test x"$ac_cv_file__dev_urandom" = x"no" ; then
     as_fn_error $? "
 no source of strong random numbers was found
-PostgreSQL can use OpenSSL, native Windows API or /dev/urandom as a source of random numbers." "$LINENO" 5
+PostgreSQL can use OpenSSL, NSS, native Windows API or /dev/urandom as a source of random numbers." "$LINENO" 5
   fi
 fi
 
diff --git a/configure.ac b/configure.ac
index f54f65febe..5ec8970588 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1201,7 +1201,7 @@ fi
 #
 # There is currently only one supported SSL/TLS library: OpenSSL.
 #
-PGAC_ARG_REQ(with, ssl, [LIB], [use LIB for SSL/TLS support (openssl)])
+PGAC_ARG_REQ(with, ssl, [LIB], [use LIB for SSL/TLS support (openssl, nss)])
 if test x"$with_ssl" = x"" ; then
   with_ssl=no
 fi
@@ -1235,8 +1235,28 @@ if test "$with_ssl" = openssl ; then
   # function was removed.
   AC_CHECK_FUNCS([CRYPTO_lock])
   AC_DEFINE([USE_OPENSSL], 1, [Define to 1 to build with OpenSSL support. (--with-ssl=openssl)])
+elif test "$with_ssl" = nss ; then
+  # TODO: fallback in case nss-config/nspr-config aren't found.
+  PGAC_PATH_PROGS(NSS_CONFIG, nss-config)
+  PGAC_PATH_PROGS(NSPR_CONFIG, nspr-config)
+  if test -n "$NSS_CONFIG"; then
+    NSS_LIBS=`$NSS_CONFIG --libs`
+	NSS_CFLAGS=`$NSS_CONFIG --cflags`
+  fi
+  if test -n "$NSPR_CONFIG"; then
+	NSPR_LIBS=`$NSPR_CONFIG --libs`
+	NSPR_CFLAGS=`$NSPR_CONFIG --cflags`
+  fi
+
+  LDFLAGS="$LDFLAGS $NSS_LIBS $NSPR_LIBS"
+  CFLAGS="$CFLAGS $NSS_CFLAGS $NSPR_CFLAGS"
+
+  AC_CHECK_LIB(nss3, NSS_InitContext, [], [AC_MSG_ERROR([library 'nss3' is required for NSS])])
+  AC_CHECK_LIB(nspr4, PR_GetDefaultIOMethods, [], [AC_MSG_ERROR([library 'nspr4' is required for NSS])])
+  AC_CHECK_LIB(ssl3, SSL_GetImplementedCiphers, [], [AC_MSG_ERROR([library 'ssl3' is required for NSS])])
+  AC_DEFINE([USE_NSS], 1, [Define to 1 if you have NSS support,])
 elif test "$with_ssl" != no ; then
-  AC_MSG_ERROR([--with-ssl must specify openssl])
+  AC_MSG_ERROR([--with-ssl must specify one of openssl or nss])
 fi
 AC_SUBST(with_ssl)
 
@@ -1414,6 +1434,9 @@ fi
 if test "$with_ssl" = openssl ; then
   AC_CHECK_HEADER(openssl/ssl.h, [], [AC_MSG_ERROR([header file <openssl/ssl.h> is required for OpenSSL])])
   AC_CHECK_HEADER(openssl/err.h, [], [AC_MSG_ERROR([header file <openssl/err.h> is required for OpenSSL])])
+elif test "$with_ssl" = nss ; then
+  AC_CHECK_HEADER(nss/ssl.h, [], [AC_MSG_ERROR([header file <nss/ssl.h> is required for NSS])])
+  AC_CHECK_HEADER(nss/nss.h, [], [AC_MSG_ERROR([header file <nss/nss.h> is required for NSS])])
 fi
 
 if test "$with_pam" = yes ; then
@@ -2170,6 +2193,8 @@ fi
 AC_MSG_CHECKING([which random number source to use])
 if test x"$with_ssl" = x"openssl" ; then
   AC_MSG_RESULT([OpenSSL])
+elif test x"$with_ssl" = x"nss" ; then
+  AC_MSG_RESULT([NSS])
 elif test x"$PORTNAME" = x"win32" ; then
   AC_MSG_RESULT([Windows native])
 else
@@ -2179,7 +2204,7 @@ else
   if test x"$ac_cv_file__dev_urandom" = x"no" ; then
     AC_MSG_ERROR([
 no source of strong random numbers was found
-PostgreSQL can use OpenSSL, native Windows API or /dev/urandom as a source of random numbers.])
+PostgreSQL can use OpenSSL, NSS, native Windows API or /dev/urandom as a source of random numbers.])
   fi
 fi
 
diff --git a/src/backend/libpq/Makefile b/src/backend/libpq/Makefile
index 8d1d16b0fc..045d2c2f6b 100644
--- a/src/backend/libpq/Makefile
+++ b/src/backend/libpq/Makefile
@@ -30,6 +30,10 @@ OBJS = \
 
 ifeq ($(with_ssl),openssl)
 OBJS += be-secure-openssl.o
+else
+ifeq ($(with_ssl),nss)
+OBJS += be-secure-nss.o
+endif
 endif
 
 ifeq ($(with_gssapi),yes)
diff --git a/src/common/Makefile b/src/common/Makefile
index 5422579a6a..57d44080b4 100644
--- a/src/common/Makefile
+++ b/src/common/Makefile
@@ -85,12 +85,18 @@ OBJS_COMMON += \
 	protocol_openssl.o \
 	cryptohash_openssl.o
 else
+ifeq ($(with_ssl),nss)
+OBJS_COMMON += \
+	cipher_nss.o \
+	cryptohash_nss.o
+else
 OBJS_COMMON += \
 	cryptohash.o \
 	md5.o \
 	sha1.o \
 	sha2.o
 endif
+endif
 
 # A few files are currently only built for frontend, not server
 # (Mkvcbuild.pm has a copy of this list, too).  logging.c is excluded
diff --git a/src/include/pg_config.h.in b/src/include/pg_config.h.in
index 04dc330119..474cc2655c 100644
--- a/src/include/pg_config.h.in
+++ b/src/include/pg_config.h.in
@@ -322,6 +322,12 @@
 /* Define to 1 if you have the `m' library (-lm). */
 #undef HAVE_LIBM
 
+/* Define to 1 if you have the `nspr4' library (-lnspr4). */
+#undef HAVE_LIBNSPR4
+
+/* Define to 1 if you have the `nss3' library (-lnss3). */
+#undef HAVE_LIBNSS3
+
 /* Define to 1 if you have the `pam' library (-lpam). */
 #undef HAVE_LIBPAM
 
@@ -334,6 +340,9 @@
 /* Define to 1 if you have the `ssl' library (-lssl). */
 #undef HAVE_LIBSSL
 
+/* Define to 1 if you have the `ssl3' library (-lssl3). */
+#undef HAVE_LIBSSL3
+
 /* Define to 1 if you have the `wldap32' library (-lwldap32). */
 #undef HAVE_LIBWLDAP32
 
@@ -899,6 +908,9 @@
 /* Define to select named POSIX semaphores. */
 #undef USE_NAMED_POSIX_SEMAPHORES
 
+/* Define to 1 if you have NSS support, */
+#undef USE_NSS
+
 /* Define to 1 to build with OpenSSL support. (--with-ssl=openssl) */
 #undef USE_OPENSSL
 
diff --git a/src/interfaces/libpq/Makefile b/src/interfaces/libpq/Makefile
index f74677eaf9..e10d8bef42 100644
--- a/src/interfaces/libpq/Makefile
+++ b/src/interfaces/libpq/Makefile
@@ -56,6 +56,11 @@ OBJS += \
 	fe-secure-openssl.o
 endif
 
+ifeq ($(with_ssl), nss)
+OBJS += \
+	fe-secure-nss.o
+endif
+
 ifeq ($(with_gssapi),yes)
 OBJS += \
 	fe-gssapi-common.o \
diff --git a/src/tools/msvc/Install.pm b/src/tools/msvc/Install.pm
index ea3af48777..afe72a7e97 100644
--- a/src/tools/msvc/Install.pm
+++ b/src/tools/msvc/Install.pm
@@ -438,7 +438,8 @@ sub CopyContribFiles
 		{
 			# These configuration-based exclusions must match vcregress.pl
 			next if ($d eq "uuid-ossp"  && !defined($config->{uuid}));
-			next if ($d eq "sslinfo"    && !defined($config->{openssl}));
+			next if ($d eq "sslinfo"    && !defined($config->{openssl})
+			  && !defined($config->{nss}));
 			next if ($d eq "xml2"       && !defined($config->{xml}));
 			next if ($d =~ /_plperl$/   && !defined($config->{perl}));
 			next if ($d =~ /_plpython$/ && !defined($config->{python}));
diff --git a/src/tools/msvc/Mkvcbuild.pm b/src/tools/msvc/Mkvcbuild.pm
index 49614106dc..53b5a71726 100644
--- a/src/tools/msvc/Mkvcbuild.pm
+++ b/src/tools/msvc/Mkvcbuild.pm
@@ -132,6 +132,11 @@ sub mkvcbuild
 		push(@pgcommonallfiles, 'cryptohash_openssl.c');
 		push(@pgcommonallfiles, 'protocol_openssl.c');
 	}
+	elsif ($solution->{options}->{nss})
+	{
+		push(@pgcommonallfiles, 'cryptohash_nss.c');
+		push(@pgcommonallfiles, 'cipher_nss.c');
+	}
 	else
 	{
 		push(@pgcommonallfiles, 'cryptohash.c');
@@ -196,12 +201,19 @@ sub mkvcbuild
 	$postgres->FullExportDLL('postgres.lib');
 
 	# The OBJS scraper doesn't know about ifdefs, so remove appropriate files
-	# if building without OpenSSL.
-	if (!$solution->{options}->{openssl})
+	# if building without various options.
+	if (!$solution->{options}->{openssl} && !$solution->{options}->{nss})
 	{
 		$postgres->RemoveFile('src/backend/libpq/be-secure-common.c');
+	}
+	if (!$solution->{options}->{openssl})
+	{
 		$postgres->RemoveFile('src/backend/libpq/be-secure-openssl.c');
 	}
+	if (!$solution->{options}->{nss})
+	{
+		$postgres->RemoveFile('src/backend/libpq/be-secure-nss.c');
+	}
 	if (!$solution->{options}->{gss})
 	{
 		$postgres->RemoveFile('src/backend/libpq/be-gssapi-common.c');
@@ -259,12 +271,19 @@ sub mkvcbuild
 	$libpq->AddReference($libpgcommon, $libpgport);
 
 	# The OBJS scraper doesn't know about ifdefs, so remove appropriate files
-	# if building without OpenSSL.
-	if (!$solution->{options}->{openssl})
+	# if building without various options
+	if (!$solution->{options}->{openssl} && !$solution->{options}->{nss})
 	{
 		$libpq->RemoveFile('src/interfaces/libpq/fe-secure-common.c');
+	}
+	if (!$solution->{options}->{openssl})
+	{
 		$libpq->RemoveFile('src/interfaces/libpq/fe-secure-openssl.c');
 	}
+	if (!$solution->{options}->{nss})
+	{
+		$libpq->RemoveFile('src/interfaces/libpq/fe-secure-nss.c');
+	}
 	if (!$solution->{options}->{gss})
 	{
 		$libpq->RemoveFile('src/interfaces/libpq/fe-gssapi-common.c');
@@ -432,9 +451,14 @@ sub mkvcbuild
 		push @contrib_excludes, 'xml2';
 	}
 
+	if (!$solution->{options}->{openssl} && !$solution->{options}->{nss})
+	{
+		push @contrib_excludes, 'sslinfo';
+	}
+
 	if (!$solution->{options}->{openssl})
 	{
-		push @contrib_excludes, 'sslinfo', 'ssl_passphrase_callback';
+		push @contrib_excludes, 'ssl_passphrase_callback';
 	}
 
 	if (!$solution->{options}->{uuid})
@@ -464,6 +488,11 @@ sub mkvcbuild
 		$pgcrypto->AddFiles('contrib/pgcrypto', 'openssl.c',
 			'pgp-mpi-openssl.c');
 	}
+	elsif ($solution->{options}->{nss})
+	{
+		$pgcrypto->AddFiles('contrib/pgcrypto', 'nss.c',
+			'pgp-mpi-internal.c', 'imath.c', 'blf.c');
+	}
 	else
 	{
 		$pgcrypto->AddFiles(
diff --git a/src/tools/msvc/Solution.pm b/src/tools/msvc/Solution.pm
index 2aa062b2c9..0b0fbffa5e 100644
--- a/src/tools/msvc/Solution.pm
+++ b/src/tools/msvc/Solution.pm
@@ -488,6 +488,7 @@ sub GenerateFiles
 		USE_LLVM                   => undef,
 		USE_NAMED_POSIX_SEMAPHORES => undef,
 		USE_OPENSSL                => undef,
+		USE_NSS                    => undef,
 		USE_PAM                    => undef,
 		USE_SLICING_BY_8_CRC32C    => undef,
 		USE_SSE42_CRC32C           => undef,
@@ -540,6 +541,10 @@ sub GenerateFiles
 			$define{HAVE_OPENSSL_INIT_SSL}      = 1;
 		}
 	}
+	if ($self->{options}->{nss})
+	{
+		$define{USE_NSS} = 1;
+	}
 
 	$self->GenerateConfigHeader('src/include/pg_config.h',     \%define, 1);
 	$self->GenerateConfigHeader('src/include/pg_config_ext.h', \%define, 0);
@@ -1008,6 +1013,21 @@ sub AddProject
 			}
 		}
 	}
+	if ($self->{options}->{nss})
+	{
+		$proj->AddIncludeDir($self->{options}->{nss} . '\..\public\nss');
+		$proj->AddIncludeDir($self->{options}->{nss} . '\include\nspr');
+		foreach my $lib (qw(plds4 plc4 nspr4))
+		{
+			$proj->AddLibrary($self->{options}->{nss} .
+							  '\lib\lib' . "$lib.lib", 0);
+		}
+		foreach my $lib (qw(ssl3 smime3 nss3))
+		{
+			$proj->AddLibrary($self->{options}->{nss} .
+							  '\lib' . "\\$lib.dll.lib", 0);
+		}
+	}
 	if ($self->{options}->{nls})
 	{
 		$proj->AddIncludeDir($self->{options}->{nls} . '\include');
-- 
2.21.1 (Apple Git-122.3)

From d658748c3c752b31720a2203aff848ac83123b65 Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Mon, 8 Feb 2021 23:52:51 +0100
Subject: [PATCH v28 8/9] nss: Support NSS in cryptohash

This adds support for using libnss as a crypto backend for the built-
in cryptohash support. Much of this code is similar to the pgcrypto
support.
---
 src/common/cryptohash_nss.c | 264 ++++++++++++++++++++++++++++++++++++
 1 file changed, 264 insertions(+)
 create mode 100644 src/common/cryptohash_nss.c

diff --git a/src/common/cryptohash_nss.c b/src/common/cryptohash_nss.c
new file mode 100644
index 0000000000..59ba9c1697
--- /dev/null
+++ b/src/common/cryptohash_nss.c
@@ -0,0 +1,264 @@
+/*-------------------------------------------------------------------------
+ *
+ * cryptohash_nss.c
+ *	  Set of wrapper routines on top of NSS to support cryptographic
+ *	  hash functions.
+ *
+ * This should only be used if code is compiled with NSS support.
+ *
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ *		  src/common/cryptohash_nss.c
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#ifndef FRONTEND
+#include "postgres.h"
+#else
+#include "postgres_fe.h"
+#endif
+
+#include "common/nss.h"
+
+#include <nss/nss.h>
+#include <nss/hasht.h>
+#include <nss/pk11func.h>
+#include <nss/pk11pub.h>
+#include <nss/secitem.h>
+#include <nss/sechash.h>
+#include <nss/secoid.h>
+#include <nss/secerr.h>
+
+#include "common/cryptohash.h"
+#ifndef FRONTEND
+#include "utils/memutils.h"
+#include "utils/resowner.h"
+#include "utils/resowner_private.h"
+#endif
+
+/*
+ * In the backend, use an allocation in TopMemoryContext to count for
+ * resowner cleanup handling.  In the frontend, use malloc to be able
+ * to return a failure status back to the caller.
+ */
+#ifndef FRONTEND
+#define ALLOC(size) MemoryContextAlloc(TopMemoryContext, size)
+#define FREE(ptr) pfree(ptr)
+#else
+#define ALLOC(size) malloc(size)
+#define FREE(ptr) free(ptr)
+#endif
+
+/*
+ * Internal pg_cryptohash_ctx structure.
+ */
+struct pg_cryptohash_ctx
+{
+	pg_cryptohash_type type;
+
+	PK11Context *pk11_context;
+	HASH_HashType hash_type;
+
+#ifndef FRONTEND
+	ResourceOwner resowner;
+#endif
+};
+
+/*
+ * pg_cryptohash_create
+ *
+ * Create and allocate a new hash context. Returns NULL on failure in the
+ * frontend, and raise error without returning in the backend.
+ */
+pg_cryptohash_ctx *
+pg_cryptohash_create(pg_cryptohash_type type)
+{
+	NSSInitParameters params;
+	pg_cryptohash_ctx *ctx;
+	SECOidData *hash;
+	SECStatus status;
+
+#ifndef FRONTEND
+	/*
+	 * Make sure that the resource owner has space to remember this reference.
+	 * This can error out with "out of memory", so do this before any other
+	 * allocation to avoid leaking.
+	 */
+	ResourceOwnerEnlargeCryptoHash(CurrentResourceOwner);
+#endif
+
+	ctx = ALLOC(sizeof(pg_cryptohash_ctx));
+
+	if (!ctx)
+		goto error;
+
+	switch(type)
+	{
+		case PG_SHA1:
+			ctx->hash_type = SEC_OID_SHA1;
+			break;
+		case PG_MD5:
+			ctx->hash_type = SEC_OID_MD5;
+			break;
+		case PG_SHA224:
+			ctx->hash_type = SEC_OID_SHA224;
+			break;
+		case PG_SHA256:
+			ctx->hash_type = SEC_OID_SHA256;
+			break;
+		case PG_SHA384:
+			ctx->hash_type = SEC_OID_SHA384;
+			break;
+		case PG_SHA512:
+			ctx->hash_type = SEC_OID_SHA512;
+			break;
+	}
+
+	/*
+	 * Initialize our own NSS context without a database backing it.
+	 */
+	memset(&params, 0, sizeof(params));
+	params.length = sizeof(params);
+	status = NSS_NoDB_Init(".");
+	if (status != SECSuccess)
+	{
+		explicit_bzero(ctx, sizeof(pg_cryptohash_ctx));
+		FREE(ctx);
+		goto error;
+	}
+
+	ctx->type = type;
+	hash = SECOID_FindOIDByTag(ctx->hash_type);
+	ctx->pk11_context = PK11_CreateDigestContext(hash->offset);
+	if (!ctx->pk11_context)
+	{
+		explicit_bzero(ctx, sizeof(pg_cryptohash_ctx));
+		FREE(ctx);
+		goto error;
+	}
+
+#ifndef FRONTEND
+	ctx->resowner = CurrentResourceOwner;
+	ResourceOwnerRememberCryptoHash(CurrentResourceOwner,
+									PointerGetDatum(ctx));
+#endif
+
+	return ctx;
+
+error:
+#ifndef FRONTEND
+	ereport(ERROR,
+			(errcode(ERRCODE_OUT_OF_MEMORY),
+			 errmsg("out of memory")));
+#endif
+	return NULL;
+}
+
+/*
+ * pg_cryptohash_init
+ *			Initialize the passed hash context
+ *
+ * Returns 0 on success, -1 on failure.
+ */
+int
+pg_cryptohash_init(pg_cryptohash_ctx *ctx)
+{
+	SECStatus		status;
+
+	status = PK11_DigestBegin(ctx->pk11_context);
+
+	if (status != SECSuccess)
+		return -1;
+	return 0;
+}
+
+/*
+ * pg_cryptohash_update
+ *
+ * Update a hash context.  Returns 0 on success, -1 on failure.
+ */
+int
+pg_cryptohash_update(pg_cryptohash_ctx *ctx, const uint8 *data, size_t len)
+{
+	SECStatus	status;
+
+	if (ctx == NULL)
+		return -1;
+
+	status = PK11_DigestOp(ctx->pk11_context, data, len);
+	if (status != SECSuccess)
+		return -1;
+
+	return 0;
+}
+
+/*
+ * pg_cryptohash_final
+ *
+ * Finalize a hash context.  Returns 0 on success, -1 on failure.
+ */
+int
+pg_cryptohash_final(pg_cryptohash_ctx *ctx, uint8 *dest, size_t len)
+{
+	SECStatus	status;
+	unsigned int outlen;
+
+	switch (ctx->type)
+	{
+		case PG_MD5:
+			if (len < MD5_LENGTH)
+				return -1;
+			break;
+		case PG_SHA1:
+			if (len < SHA1_LENGTH)
+				return -1;
+			break;
+		case PG_SHA224:
+			if (len < SHA224_LENGTH)
+				return -1;
+			break;
+		case PG_SHA256:
+			if (len < SHA256_LENGTH)
+				return -1;
+			break;
+		case PG_SHA384:
+			if (len < SHA384_LENGTH)
+				return -1;
+			break;
+		case PG_SHA512:
+			if (len < SHA512_LENGTH)
+				return -1;
+			break;
+	}
+
+	status = PK11_DigestFinal(ctx->pk11_context, dest, &outlen, len);
+
+	if (status != SECSuccess)
+		return -1;
+
+	return 0;
+}
+
+/*
+ * pg_cryptohash_free
+ *
+ * Free a hash context and the associated NSS context.
+ */
+void
+pg_cryptohash_free(pg_cryptohash_ctx *ctx)
+{
+	PRBool		free_context = PR_TRUE;
+
+	if (!ctx)
+		return;
+
+	PK11_DestroyContext(ctx->pk11_context, free_context);
+#ifndef FRONTEND
+	ResourceOwnerForgetCryptoHash(ctx->resowner, PointerGetDatum(ctx));
+#endif
+	explicit_bzero(ctx, sizeof(pg_cryptohash_ctx));
+	FREE(ctx);
+}
-- 
2.21.1 (Apple Git-122.3)

From 8c782dee692364d7ba03758b4c877452348e2b29 Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Mon, 8 Feb 2021 23:52:48 +0100
Subject: [PATCH v28 7/9] nss: Support NSS in sslinfo

Since sslinfo to a large extent use the be_tls_* API this mostly
disables functionality which currently is OpenSSL specific.
---
 contrib/sslinfo/sslinfo.c | 32 ++++++++++++++++++++++++++++++++
 doc/src/sgml/sslinfo.sgml | 12 +++++++++++-
 2 files changed, 43 insertions(+), 1 deletion(-)

diff --git a/contrib/sslinfo/sslinfo.c b/contrib/sslinfo/sslinfo.c
index 30cae0bb98..3aadd90aa6 100644
--- a/contrib/sslinfo/sslinfo.c
+++ b/contrib/sslinfo/sslinfo.c
@@ -9,9 +9,11 @@
 
 #include "postgres.h"
 
+#ifdef USE_OPENSSL
 #include <openssl/x509.h>
 #include <openssl/x509v3.h>
 #include <openssl/asn1.h>
+#endif
 
 #include "access/htup_details.h"
 #include "funcapi.h"
@@ -21,6 +23,7 @@
 
 PG_MODULE_MAGIC;
 
+#ifdef USE_OPENSSL
 static Datum X509_NAME_field_to_text(X509_NAME *name, text *fieldName);
 static Datum ASN1_STRING_to_text(ASN1_STRING *str);
 
@@ -31,6 +34,7 @@ typedef struct
 {
 	TupleDesc	tupdesc;
 } SSLExtensionInfoContext;
+#endif
 
 /*
  * Indicates whether current session uses SSL
@@ -131,6 +135,7 @@ ssl_client_serial(PG_FUNCTION_ARGS)
 }
 
 
+#ifdef USE_OPENSSL
 /*
  * Converts OpenSSL ASN1_STRING structure into text
  *
@@ -282,7 +287,23 @@ ssl_issuer_field(PG_FUNCTION_ARGS)
 	else
 		return result;
 }
+#endif							/* USE_OPENSSL */
 
+#ifdef USE_NSS
+PG_FUNCTION_INFO_V1(ssl_client_dn_field);
+Datum
+ssl_client_dn_field(PG_FUNCTION_ARGS)
+{
+	PG_RETURN_NULL();
+}
+
+PG_FUNCTION_INFO_V1(ssl_issuer_field);
+Datum
+ssl_issuer_field(PG_FUNCTION_ARGS)
+{
+	PG_RETURN_NULL();
+}
+#endif							/* USE_NSS */
 
 /*
  * Returns current client certificate subject as one string
@@ -338,6 +359,7 @@ ssl_issuer_dn(PG_FUNCTION_ARGS)
 }
 
 
+#ifdef USE_OPENSSL
 /*
  * Returns information about available SSL extensions.
  *
@@ -471,3 +493,13 @@ ssl_extension_info(PG_FUNCTION_ARGS)
 	/* All done */
 	SRF_RETURN_DONE(funcctx);
 }
+#endif							/* USE_OPENSSL */
+
+#ifdef USE_NSS
+PG_FUNCTION_INFO_V1(ssl_extension_info);
+Datum
+ssl_extension_info(PG_FUNCTION_ARGS)
+{
+	PG_RETURN_NULL();
+}
+#endif							/* USE_NSS */
diff --git a/doc/src/sgml/sslinfo.sgml b/doc/src/sgml/sslinfo.sgml
index 2a9c45a111..f3ae2fc3b8 100644
--- a/doc/src/sgml/sslinfo.sgml
+++ b/doc/src/sgml/sslinfo.sgml
@@ -22,7 +22,8 @@
 
  <para>
   This extension won't build at all unless the installation was
-  configured with <literal>--with-ssl=openssl</literal>.
+  configured with SSL support, such as <literal>--with-ssl=openssl</literal>
+  or <literal>--with-ssl=nss</literal>.
  </para>
 
  <sect2>
@@ -208,6 +209,9 @@ emailAddress
      the X.500 and X.509 standards, so you cannot just assign arbitrary
      meaning to them.
     </para>
+    <para>
+     This function is only available when using <productname>OpenSSL</productname>.
+    </para>
     </listitem>
    </varlistentry>
 
@@ -223,6 +227,9 @@ emailAddress
      Same as <function>ssl_client_dn_field</function>, but for the certificate issuer
      rather than the certificate subject.
     </para>
+    <para>
+     This function is only available when using <productname>OpenSSL</productname>.
+    </para>
     </listitem>
    </varlistentry>
 
@@ -238,6 +245,9 @@ emailAddress
      Provide information about extensions of client certificate: extension name,
      extension value, and if it is a critical extension.
     </para>
+    <para>
+     This function is only available when using <productname>OpenSSL</productname>.
+    </para>
     </listitem>
    </varlistentry>
   </variablelist>
-- 
2.21.1 (Apple Git-122.3)

From 420eca69c0b97560cd29a514555448a3c1d429f5 Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Mon, 8 Feb 2021 23:52:45 +0100
Subject: [PATCH v28 6/9] nss: Support NSS in pgcrypto

This extends pgcrypto to be able to use libnss as a cryptographic
backend for pgcrypto much like how OpenSSL is a supported backend.
Blowfish is not a supported cipher in NSS, so the implementation
falls back on the built-in BF code to be compatible in terms of
cipher support.
---
 contrib/pgcrypto/Makefile  |   7 +-
 contrib/pgcrypto/nss.c     | 753 +++++++++++++++++++++++++++++++++++++
 doc/src/sgml/pgcrypto.sgml |  38 +-
 3 files changed, 787 insertions(+), 11 deletions(-)
 create mode 100644 contrib/pgcrypto/nss.c

diff --git a/contrib/pgcrypto/Makefile b/contrib/pgcrypto/Makefile
index c0b4f1fcf6..ede7a78146 100644
--- a/contrib/pgcrypto/Makefile
+++ b/contrib/pgcrypto/Makefile
@@ -7,11 +7,14 @@ INT_TESTS = sha2
 OSSL_SRCS = openssl.c pgp-mpi-openssl.c
 OSSL_TESTS = sha2 des 3des cast5
 
+NSS_SRCS = nss.c pgp-mpi-internal.c imath.c blf.c
+NSS_TESTS = sha2 des 3des
+
 ZLIB_TST = pgp-compression
 ZLIB_OFF_TST = pgp-zlib-DISABLED
 
-CF_SRCS = $(if $(subst openssl,,$(with_ssl)), $(INT_SRCS), $(OSSL_SRCS))
-CF_TESTS = $(if $(subst openssl,,$(with_ssl)), $(INT_TESTS), $(OSSL_TESTS))
+CF_SRCS = $(if $(findstring openssl, $(with_ssl)), $(OSSL_SRCS), $(if $(findstring nss, $(with_ssl)), $(NSS_SRCS), $(INT_SRCS)))
+CF_TESTS = $(if $(findstring openssl, $(with_ssl)), $(OSSL_TESTS), $(if $(findstring nss, $(with_ssl)), $(NSS_TESTS), $(INT_TESTS)))
 CF_PGP_TESTS = $(if $(subst no,,$(with_zlib)), $(ZLIB_TST), $(ZLIB_OFF_TST))
 
 SRCS = \
diff --git a/contrib/pgcrypto/nss.c b/contrib/pgcrypto/nss.c
new file mode 100644
index 0000000000..d4fd4680ec
--- /dev/null
+++ b/contrib/pgcrypto/nss.c
@@ -0,0 +1,753 @@
+/*-------------------------------------------------------------------------
+ *
+ * nss.c
+ *	  Wrapper for using NSS as a backend for pgcrypto PX
+ *
+ *
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ *	  contrib/pgcrypto/nss.c
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#include "postgres.h"
+
+#include "px.h"
+#include "blf.h"
+#include "common/nss.h"
+#include "utils/memutils.h"
+
+#include <nss/nss.h>
+#include <nss/hasht.h>
+#include <nss/pk11func.h>
+#include <nss/pk11pub.h>
+#include <nss/secitem.h>
+#include <nss/sechash.h>
+#include <nss/secoid.h>
+#include <nss/secerr.h>
+
+/*
+ * Define our own mechanisms for Blowfish as it's not implemented by NSS.
+ */
+#define BLOWFISH_CBC	(1)
+#define BLOWFISH_ECB	(2)
+
+/*
+ * Data structures for recording cipher implementations as well as ongoing
+ * cipher operations.
+ */
+typedef struct nss_digest
+{
+	NSSInitContext *context;
+	PK11Context *hash_context;
+	HASH_HashType hash_type;
+}			nss_digest;
+
+typedef struct cipher_implementation
+{
+	/* Function pointers to cipher operations */
+	int			(*init) (PX_Cipher *pxc, const uint8 *key, unsigned klen, const uint8 *iv);
+	unsigned	(*get_block_size) (PX_Cipher *pxc);
+	unsigned	(*get_key_size) (PX_Cipher *pxc);
+	unsigned	(*get_iv_size) (PX_Cipher *pxc);
+	int			(*encrypt) (PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res);
+	int			(*decrypt) (PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res);
+	void		(*free) (PX_Cipher *pxc);
+
+	/* The mechanism describing the cipher used */
+	union
+	{
+		CK_MECHANISM_TYPE nss;
+		CK_ULONG	internal;
+	}			mechanism;
+	int			keylen;
+	bool		is_nss;
+}			cipher_implementation;
+
+typedef struct nss_cipher
+{
+	const cipher_implementation *impl;
+	NSSInitContext *context;
+	PK11Context *crypt_context;
+	SECItem    *params;
+
+	PK11SymKey *encrypt_key;
+	PK11SymKey *decrypt_key;
+}			nss_cipher;
+
+typedef struct internal_cipher
+{
+	const cipher_implementation *impl;
+	BlowfishContext context;
+}			internal_cipher;
+
+typedef struct nss_cipher_ref
+{
+	const char *name;
+	const cipher_implementation *impl;
+}			nss_cipher_ref;
+
+/*
+ * Prototypes
+ */
+static unsigned nss_get_iv_size(PX_Cipher *pxc);
+static unsigned nss_get_block_size(PX_Cipher *pxc);
+
+/*
+ * nss_GetHashOidTagByHashType
+ *
+ * Returns the corresponding SECOidTag for the passed hash type. NSS 3.43
+ * includes HASH_GetHashOidTagByHashType for this purpose, but at the time of
+ * writing is not commonly available so we need our own version till then.
+ */
+static SECOidTag
+nss_GetHashOidTagByHashType(HASH_HashType type)
+{
+	if (type == HASH_AlgMD2)
+		return SEC_OID_MD2;
+	if (type == HASH_AlgMD5)
+		return SEC_OID_MD5;
+	if (type == HASH_AlgSHA1)
+		return SEC_OID_SHA1;
+	if (type == HASH_AlgSHA224)
+		return SEC_OID_SHA224;
+	if (type == HASH_AlgSHA256)
+		return SEC_OID_SHA256;
+	if (type == HASH_AlgSHA384)
+		return SEC_OID_SHA384;
+	if (type == HASH_AlgSHA512)
+		return SEC_OID_SHA512;
+
+	return SEC_OID_UNKNOWN;
+}
+
+static unsigned
+nss_digest_block_size(PX_MD *pxmd)
+{
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+	const SECHashObject *object;
+
+	object = HASH_GetHashObject(digest->hash_type);
+	return object->blocklength;
+}
+
+static unsigned
+nss_digest_result_size(PX_MD *pxmd)
+{
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+	const SECHashObject *object;
+
+	object = HASH_GetHashObject(digest->hash_type);
+	return object->length;
+}
+
+static void
+nss_digest_free(PX_MD *pxmd)
+{
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+	PRBool		free_ctx = PR_TRUE;
+
+	PK11_DestroyContext(digest->hash_context, free_ctx);
+	NSS_ShutdownContext(digest->context);
+}
+
+static void
+nss_digest_update(PX_MD *pxmd, const uint8 *data, unsigned dlen)
+{
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+
+	PK11_DigestOp(digest->hash_context, data, dlen);
+}
+
+static void
+nss_digest_reset(PX_MD *pxmd)
+{
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+
+	PK11_DigestBegin(digest->hash_context);
+}
+
+static void
+nss_digest_finish(PX_MD *pxmd, uint8 *dst)
+{
+	unsigned int outlen;
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+	const SECHashObject *object;
+
+	object = HASH_GetHashObject(digest->hash_type);
+	PK11_DigestFinal(digest->hash_context, dst, &outlen, object->length);
+}
+
+int
+px_find_digest(const char *name, PX_MD **res)
+{
+	PX_MD	   *pxmd;
+	NSSInitParameters params;
+	NSSInitContext *nss_context;
+	bool		found = false;
+	nss_digest *digest;
+	SECStatus	status;
+	SECOidData *hash;
+	HASH_HashType t;
+
+	/*
+	 * Initialize our own NSS context without a database backing it.
+	 */
+	memset(&params, 0, sizeof(params));
+	params.length = sizeof(params);
+	nss_context = NSS_InitContext("", "", "", "", &params,
+								  NSS_INIT_READONLY | NSS_INIT_NOCERTDB |
+								  NSS_INIT_NOMODDB | NSS_INIT_FORCEOPEN |
+								  NSS_INIT_NOROOTINIT | NSS_INIT_PK11RELOAD);
+
+	/*
+	 * There is no API function for looking up a digest algorithm from a name
+	 * string, but there is a publicly accessible array which can be scanned
+	 * for the name.
+	 */
+	for (t = HASH_AlgNULL + 1; t < HASH_AlgTOTAL; t++)
+	{
+		SECOidTag	hash_oid;
+		char	   *p;
+
+		hash_oid = nss_GetHashOidTagByHashType(t);
+
+		if (hash_oid == SEC_OID_UNKNOWN)
+			return PXE_NO_HASH;
+
+		hash = SECOID_FindOIDByTag(hash_oid);
+		if (pg_strcasecmp(hash->desc, name) == 0)
+		{
+			found = true;
+			break;
+		}
+
+		/*
+		 * NSS saves the algorithm names using SHA-xxx notation whereas
+		 * OpenSSL use SHAxxx. To make sure the user finds the requested
+		 * algorithm let's remove the dash and compare that spelling as well.
+		 */
+		if ((p = strchr(hash->desc, '-')) != NULL)
+		{
+			char		tmp[12];
+
+			memcpy(tmp, hash->desc, p - hash->desc);
+			memcpy(tmp + (p - hash->desc), p + 1, strlen(hash->desc) - (p - hash->desc) + 1);
+			if (pg_strcasecmp(tmp, name) == 0)
+			{
+				found = true;
+				break;
+			}
+		}
+	}
+
+	if (!found)
+		return PXE_NO_HASH;
+
+	digest = palloc(sizeof(*digest));
+
+	digest->context = nss_context;
+	digest->hash_context = PK11_CreateDigestContext(hash->offset);
+	digest->hash_type = t;
+	if (digest->hash_context == NULL)
+	{
+		pfree(digest);
+		return -1;
+	}
+
+	status = PK11_DigestBegin(digest->hash_context);
+	if (status != SECSuccess)
+	{
+		PK11_DestroyContext(digest->hash_context, PR_TRUE);
+		pfree(digest);
+		return -1;
+	}
+
+	pxmd = palloc(sizeof(*pxmd));
+	pxmd->result_size = nss_digest_result_size;
+	pxmd->block_size = nss_digest_block_size;
+	pxmd->reset = nss_digest_reset;
+	pxmd->update = nss_digest_update;
+	pxmd->finish = nss_digest_finish;
+	pxmd->free = nss_digest_free;
+	pxmd->p.ptr = (void *) digest;
+
+	*res = pxmd;
+
+	return 0;
+}
+
+static int
+bf_init(PX_Cipher *pxc, const uint8 *key, unsigned klen, const uint8 *iv)
+{
+	internal_cipher *cipher = (internal_cipher *) pxc->ptr;
+
+	blowfish_setkey(&cipher->context, key, klen);
+	if (iv)
+		blowfish_setiv(&cipher->context, iv);
+
+	return 0;
+}
+
+static int
+bf_encrypt(PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res)
+{
+	internal_cipher *cipher = (internal_cipher *) pxc->ptr;
+	uint8	   *buf;
+
+	if (dlen == 0)
+		return 0;
+
+	if (dlen & 7)
+		return PXE_NOTBLOCKSIZE;
+
+	buf = palloc(dlen);
+	memcpy(buf, data, dlen);
+
+	if (cipher->impl->mechanism.internal == BLOWFISH_ECB)
+		blowfish_encrypt_ecb(buf, dlen, &cipher->context);
+	else
+		blowfish_encrypt_cbc(buf, dlen, &cipher->context);
+
+	memcpy(res, buf, dlen);
+	pfree(buf);
+
+	return 0;
+}
+
+static int
+bf_decrypt(PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res)
+{
+	internal_cipher *cipher = (internal_cipher *) pxc->ptr;
+
+	if (dlen == 0)
+		return 0;
+
+	if (dlen & 7)
+		return PXE_NOTBLOCKSIZE;
+
+	memcpy(res, data, dlen);
+	if (cipher->impl->mechanism.internal == BLOWFISH_ECB)
+		blowfish_decrypt_ecb(res, dlen, &cipher->context);
+	else
+		blowfish_decrypt_cbc(res, dlen, &cipher->context);
+
+	return 0;
+}
+
+static void
+bf_free(PX_Cipher *pxc)
+{
+	internal_cipher *cipher = (internal_cipher *) pxc->ptr;
+
+	pfree(cipher);
+	pfree(pxc);
+}
+
+static int
+nss_symkey_blockcipher_init(PX_Cipher *pxc, const uint8 *key, unsigned klen,
+							const uint8 *iv)
+{
+	nss_cipher *cipher = (nss_cipher *) pxc->ptr;
+	SECItem		iv_item;
+	unsigned char *iv_item_data;
+	SECItem		key_item;
+	int			keylen;
+	PK11SlotInfo *slot;
+
+	if (cipher->impl->mechanism.nss == CKM_AES_CBC ||
+		cipher->impl->mechanism.nss == CKM_AES_ECB)
+	{
+		if (klen <= 128 / 8)
+			keylen = 128 / 8;
+		else if (klen <= 192 / 8)
+			keylen = 192 / 8;
+		else if (klen <= 256 / 8)
+			keylen = 256 / 8;
+		else
+			return PXE_CIPHER_INIT;
+	}
+	else
+		keylen = cipher->impl->keylen;
+
+	key_item.type = siBuffer;
+	key_item.data = (unsigned char *) key;
+	key_item.len = keylen;
+
+	/*
+	 * If hardware acceleration is configured in NSS one can theoretically get
+	 * a better slot by calling PK11_GetBestSlot() with the mechanism passed
+	 * to it. Unless there are complaints, using the simpler API will make
+	 * error handling easier though.
+	 */
+	slot = PK11_GetInternalSlot();
+	if (!slot)
+		return PXE_CIPHER_INIT;
+
+	/*
+	 * The key must be set up for the operation, and since we don't know at
+	 * this point whether we are asked to encrypt or decrypt we need to store
+	 * both versions.
+	 */
+	cipher->decrypt_key = PK11_ImportSymKey(slot, cipher->impl->mechanism.nss,
+											PK11_OriginUnwrap,
+											CKA_DECRYPT, &key_item,
+											NULL);
+	cipher->encrypt_key = PK11_ImportSymKey(slot, cipher->impl->mechanism.nss,
+											PK11_OriginUnwrap,
+											CKA_ENCRYPT, &key_item,
+											NULL);
+	PK11_FreeSlot(slot);
+
+	if (!cipher->decrypt_key || !cipher->encrypt_key)
+		return PXE_CIPHER_INIT;
+
+	if (iv)
+	{
+		iv_item.type = siBuffer;
+		iv_item.data = (unsigned char *) iv;
+		iv_item.len = nss_get_iv_size(pxc);
+	}
+	else
+	{
+		/*
+		 * The documentation states that either passing .data = 0; .len = 0;
+		 * in the iv_item, or NULL as iv_item, to PK11_ParamFromIV should be
+		 * done when IV is missing. That however leads to segfaults in the
+		 * library, the workaround that works in modern  library versions is
+		 * to pass in a keysized zeroed out IV.
+		 */
+		iv_item_data = palloc0(nss_get_iv_size(pxc));
+		iv_item.type = siBuffer;
+		iv_item.data = iv_item_data;
+		iv_item.len = nss_get_iv_size(pxc);
+	}
+
+	cipher->params = PK11_ParamFromIV(cipher->impl->mechanism.nss, &iv_item);
+
+	/* If we had to make a mock IV, free it once made into a param */
+	if (!iv)
+		pfree(iv_item_data);
+
+	if (cipher->params == NULL)
+		return PXE_CIPHER_INIT;
+
+	return 0;
+}
+
+static int
+nss_decrypt(PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res)
+{
+	nss_cipher *cipher = (nss_cipher *) pxc->ptr;
+	SECStatus	status;
+	int			outlen;
+
+	if (!cipher->crypt_context)
+	{
+		cipher->crypt_context =
+			PK11_CreateContextBySymKey(cipher->impl->mechanism.nss, CKA_DECRYPT,
+									   cipher->decrypt_key, cipher->params);
+	}
+
+	status = PK11_CipherOp(cipher->crypt_context, res, &outlen, dlen, data, dlen);
+	if (status != SECSuccess)
+		return PXE_DECRYPT_FAILED;
+
+	return 0;
+}
+
+static int
+nss_encrypt(PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res)
+{
+	nss_cipher *cipher = (nss_cipher *) pxc->ptr;
+	SECStatus	status;
+	int			outlen;
+
+	if (!cipher->crypt_context)
+	{
+		cipher->crypt_context =
+			PK11_CreateContextBySymKey(cipher->impl->mechanism.nss, CKA_ENCRYPT,
+									   cipher->decrypt_key, cipher->params);
+	}
+
+	status = PK11_CipherOp(cipher->crypt_context, res, &outlen, dlen, data, dlen);
+
+	if (status != SECSuccess)
+		return PXE_DECRYPT_FAILED;
+
+	return 0;
+}
+
+static void
+nss_free(PX_Cipher *pxc)
+{
+	nss_cipher *cipher = pxc->ptr;
+	PRBool		free_ctx = PR_TRUE;
+
+	PK11_FreeSymKey(cipher->encrypt_key);
+	PK11_FreeSymKey(cipher->decrypt_key);
+	PK11_DestroyContext(cipher->crypt_context, free_ctx);
+	NSS_ShutdownContext(cipher->context);
+	pfree(cipher);
+
+	pfree(pxc);
+}
+
+static unsigned
+nss_get_block_size(PX_Cipher *pxc)
+{
+	nss_cipher *cipher = pxc->ptr;
+
+	return PK11_GetBlockSize(cipher->impl->mechanism.nss, NULL);
+}
+
+static unsigned
+nss_get_key_size(PX_Cipher *pxc)
+{
+	nss_cipher *cipher = pxc->ptr;
+
+	return cipher->impl->keylen;
+}
+
+static unsigned
+nss_get_iv_size(PX_Cipher *pxc)
+{
+	nss_cipher *cipher = pxc->ptr;
+
+	return PK11_GetIVLength(cipher->impl->mechanism.nss);
+}
+
+static unsigned
+bf_get_block_size(PX_Cipher *pxc)
+{
+	return 8;
+}
+
+static unsigned
+bf_get_key_size(PX_Cipher *pxc)
+{
+	return 448 / 8;
+}
+
+static unsigned
+bf_get_iv_size(PX_Cipher *pxc)
+{
+	return 8;
+}
+
+/*
+ * Cipher Implementations
+ */
+static const cipher_implementation nss_des_cbc = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_DES_CBC,
+	.keylen = 8,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_des_ecb = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_DES_ECB,
+	.keylen = 8,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_des3_cbc = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_DES3_CBC,
+	.keylen = 24,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_des3_ecb = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_DES3_ECB,
+	.keylen = 24,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_aes_cbc = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_AES_CBC,
+	.keylen = 32,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_aes_ecb = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_AES_ECB,
+	.keylen = 32,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_bf_ecb = {
+	.init = bf_init,
+	.get_block_size = bf_get_block_size,
+	.get_key_size = bf_get_key_size,
+	.get_iv_size = bf_get_iv_size,
+	.encrypt = bf_encrypt,
+	.decrypt = bf_decrypt,
+	.free = bf_free,
+	.mechanism.internal = BLOWFISH_ECB,
+	.keylen = 56,
+	.is_nss = false
+};
+
+static const cipher_implementation nss_bf_cbc = {
+	.init = bf_init,
+	.get_block_size = bf_get_block_size,
+	.get_key_size = bf_get_key_size,
+	.get_iv_size = bf_get_iv_size,
+	.encrypt = bf_encrypt,
+	.decrypt = bf_decrypt,
+	.free = bf_free,
+	.mechanism.internal = BLOWFISH_CBC,
+	.keylen = 56,
+	.is_nss = false
+};
+
+/*
+ * Lookup table for finding the implementation based on a name. CAST5 as well
+ * as BLOWFISH are defined as cipher mechanisms in NSS but error out with
+ * SEC_ERROR_INVALID_ALGORITHM. Blowfish is implemented using the internal
+ * implementation while CAST5 isn't supported at all at this time,
+ */
+static const nss_cipher_ref nss_cipher_lookup[] = {
+	{"des", &nss_des_cbc},
+	{"des-cbc", &nss_des_cbc},
+	{"des-ecb", &nss_des_ecb},
+	{"des3-cbc", &nss_des3_cbc},
+	{"3des", &nss_des3_cbc},
+	{"3des-cbc", &nss_des3_cbc},
+	{"des3-ecb", &nss_des3_ecb},
+	{"3des-ecb", &nss_des3_ecb},
+	{"aes", &nss_aes_cbc},
+	{"aes-cbc", &nss_aes_cbc},
+	{"aes-ecb", &nss_aes_ecb},
+	{"rijndael", &nss_aes_cbc},
+	{"rijndael-cbc", &nss_aes_cbc},
+	{"rijndael-ecb", &nss_aes_ecb},
+	{"blowfish", &nss_bf_cbc},
+	{"blowfish-cbc", &nss_bf_cbc},
+	{"blowfish-ecb", &nss_bf_ecb},
+	{"bf", &nss_bf_cbc},
+	{"bf-cbc", &nss_bf_cbc},
+	{"bf-ecb", &nss_bf_ecb},
+	{NULL}
+};
+
+/*
+ * px_find_cipher
+ *
+ * Search for the requested cipher and see if there is support for it, and if
+ * so return an allocated object containing the playbook for how to encrypt
+ * and decrypt using the cipher.
+ */
+int
+px_find_cipher(const char *alias, PX_Cipher **res)
+{
+	const nss_cipher_ref *cipher_ref;
+	PX_Cipher  *px_cipher;
+	NSSInitParameters params;
+	NSSInitContext *nss_context;
+	nss_cipher *cipher;
+	internal_cipher *int_cipher;
+
+	for (cipher_ref = nss_cipher_lookup; cipher_ref->name; cipher_ref++)
+	{
+		if (strcmp(cipher_ref->name, alias) == 0)
+			break;
+	}
+
+	if (!cipher_ref->name)
+		return PXE_NO_CIPHER;
+
+	/*
+	 * Fill in the PX_Cipher to pass back to PX describing the operations to
+	 * perform in order to use the cipher.
+	 */
+	px_cipher = palloc(sizeof(*px_cipher));
+	px_cipher->block_size = cipher_ref->impl->get_block_size;
+	px_cipher->key_size = cipher_ref->impl->get_key_size;
+	px_cipher->iv_size = cipher_ref->impl->get_iv_size;
+	px_cipher->free = cipher_ref->impl->free;
+	px_cipher->init = cipher_ref->impl->init;
+	px_cipher->encrypt = cipher_ref->impl->encrypt;
+	px_cipher->decrypt = cipher_ref->impl->decrypt;
+
+	/*
+	 * Set the private data, which is different for NSS and internal ciphers
+	 */
+	if (cipher_ref->impl->is_nss)
+	{
+		/*
+		 * Initialize our own NSS context without a database backing it. At
+		 * some point we might want to allow users to use stored keys in the
+		 * database rather than passing them via SELECT encrypt(), and then
+		 * this need to be changed to open a user specified database.
+		 */
+		memset(&params, 0, sizeof(params));
+		params.length = sizeof(params);
+		nss_context = NSS_InitContext("", "", "", "", &params,
+									  NSS_INIT_READONLY | NSS_INIT_NOCERTDB |
+									  NSS_INIT_NOMODDB | NSS_INIT_FORCEOPEN |
+									  NSS_INIT_NOROOTINIT | NSS_INIT_PK11RELOAD);
+
+		/* nss_cipher is the private state struct for the operation */
+		cipher = palloc(sizeof(*cipher));
+		cipher->context = nss_context;
+		cipher->impl = cipher_ref->impl;
+		cipher->crypt_context = NULL;
+
+		px_cipher->ptr = cipher;
+	}
+	else
+	{
+		int_cipher = palloc0(sizeof(*int_cipher));
+
+		int_cipher->impl = cipher_ref->impl;
+		px_cipher->ptr = int_cipher;
+	}
+
+	*res = px_cipher;
+	return 0;
+}
diff --git a/doc/src/sgml/pgcrypto.sgml b/doc/src/sgml/pgcrypto.sgml
index b6bb23de0f..bf486f0c07 100644
--- a/doc/src/sgml/pgcrypto.sgml
+++ b/doc/src/sgml/pgcrypto.sgml
@@ -45,8 +45,9 @@ digest(data bytea, type text) returns bytea
     <literal>sha224</literal>, <literal>sha256</literal>,
     <literal>sha384</literal> and <literal>sha512</literal>.
     If <filename>pgcrypto</filename> was built with
-    <productname>OpenSSL</productname>, more algorithms are available, as
-    detailed in <xref linkend="pgcrypto-with-without-openssl"/>.
+    <productname>OpenSSL</productname> or <productname>NSS</productname>,
+    more algorithms are available, as
+    detailed in <xref linkend="pgcrypto-with-without-openssl-nss"/>.
    </para>
 
    <para>
@@ -764,7 +765,7 @@ pgp_sym_encrypt(data, psw, 'compress-algo=1, cipher-algo=aes256')
     Which cipher algorithm to use.
    </para>
 <literallayout>
-Values: bf, aes128, aes192, aes256 (OpenSSL-only: <literal>3des</literal>, <literal>cast5</literal>)
+Values: bf, aes128, aes192, aes256 (OpenSSL-only: <literal>3des</literal>, <literal>cast5</literal>; NSS-only: <literal>3des</literal>)
 Default: aes128
 Applies to: pgp_sym_encrypt, pgp_pub_encrypt
 </literallayout>
@@ -1153,8 +1154,8 @@ gen_random_uuid() returns uuid
    <para>
     <filename>pgcrypto</filename> configures itself according to the findings of the
     main PostgreSQL <literal>configure</literal> script.  The options that
-    affect it are <literal>--with-zlib</literal> and
-    <literal>--with-ssl=openssl</literal>.
+    affect it are <literal>--with-zlib</literal>,
+    <literal>--with-ssl=openssl</literal> and <literal>--with-ssl=nss</literal>.
    </para>
 
    <para>
@@ -1169,14 +1170,16 @@ gen_random_uuid() returns uuid
     BIGNUM functions.
    </para>
 
-   <table id="pgcrypto-with-without-openssl">
-    <title>Summary of Functionality with and without OpenSSL</title>
-    <tgroup cols="3">
+   <table id="pgcrypto-with-without-openssl-nss">
+    <title>Summary of Functionality with and without external cryptographic
+      library</title>
+    <tgroup cols="4">
      <thead>
       <row>
        <entry>Functionality</entry>
        <entry>Built-in</entry>
        <entry>With OpenSSL</entry>
+       <entry>With NSS</entry>
       </row>
      </thead>
      <tbody>
@@ -1184,51 +1187,67 @@ gen_random_uuid() returns uuid
        <entry>MD5</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>SHA1</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>SHA224/256/384/512</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>Other digest algorithms</entry>
        <entry>no</entry>
        <entry>yes (Note 1)</entry>
+       <entry>yes (Note 1)</entry>
       </row>
       <row>
        <entry>Blowfish</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>AES</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>DES/3DES/CAST5</entry>
        <entry>no</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
+      </row>
+      <row>
+       <entry>CAST5</entry>
+       <entry>no</entry>
+       <entry>yes</entry>
+       <entry>no</entry>
       </row>
       <row>
        <entry>Raw encryption</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>PGP Symmetric encryption</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>PGP Public-Key encryption</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
      </tbody>
     </tgroup>
@@ -1241,7 +1260,8 @@ gen_random_uuid() returns uuid
    <orderedlist>
     <listitem>
      <para>
-      Any digest algorithm <productname>OpenSSL</productname> supports
+      Any digest algorithm <productname>OpenSSL</productname> and
+      <productname>NSS</productname> supports
       is automatically picked up.
       This is not possible with ciphers, which need to be supported
       explicitly.
-- 
2.21.1 (Apple Git-122.3)

From b225e9706348314cdf7f382e0dbf03c47e1a5c25 Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Mon, 8 Feb 2021 23:52:42 +0100
Subject: [PATCH v28 5/9] nss: Documentation

Basic documentation of the new API (keypass hooks) as well as config
parameters and installation. Additionally there is a section on how
to create certificate and keys using the NSS toolchain.
---
 doc/src/sgml/acronyms.sgml     |  43 +++++
 doc/src/sgml/config.sgml       |  28 ++-
 doc/src/sgml/installation.sgml |  31 ++-
 doc/src/sgml/libpq.sgml        | 340 +++++++++++++++++++++++++--------
 doc/src/sgml/runtime.sgml      | 124 +++++++++++-
 5 files changed, 476 insertions(+), 90 deletions(-)

diff --git a/doc/src/sgml/acronyms.sgml b/doc/src/sgml/acronyms.sgml
index 4e5ec983c0..7b02c8a622 100644
--- a/doc/src/sgml/acronyms.sgml
+++ b/doc/src/sgml/acronyms.sgml
@@ -441,6 +441,28 @@
     </listitem>
    </varlistentry>
 
+   <varlistentry>
+    <term><acronym>NSPR</acronym></term>
+    <listitem>
+     <para>
+      <ulink
+      url="https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSPR">
+      Netscape Portable Runtime</ulink>
+     </para>
+    </listitem>
+   </varlistentry>
+
+   <varlistentry>
+    <term><acronym>NSS</acronym></term>
+    <listitem>
+     <para>
+      <ulink
+      url="https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS">
+      Network Security Services</ulink>
+     </para>
+    </listitem>
+   </varlistentry>
+
    <varlistentry>
     <term><acronym>ODBC</acronym></term>
     <listitem>
@@ -539,6 +561,17 @@
     </listitem>
    </varlistentry>
 
+   <varlistentry>
+    <term><acronym>PKCS#12</acronym></term>
+    <listitem>
+     <para>
+      <ulink
+      url="https://en.wikipedia.org/wiki/PKCS_12">
+      Public-Key Cryptography Standards #12</ulink>
+     </para>
+    </listitem>
+   </varlistentry>
+
    <varlistentry>
     <term><acronym>PL</acronym></term>
     <listitem>
@@ -684,6 +717,16 @@
     </listitem>
    </varlistentry>
 
+   <varlistentry>
+    <term><acronym>TLS</acronym></term>
+    <listitem>
+     <para>
+      <ulink url="https://en.wikipedia.org/wiki/Transport_Layer_Security">
+      Transport Layer Security</ulink>
+     </para>
+    </listitem>
+   </varlistentry>
+
    <varlistentry>
     <term><acronym>TOAST</acronym></term>
     <listitem>
diff --git a/doc/src/sgml/config.sgml b/doc/src/sgml/config.sgml
index e81141e45c..7719f2914d 100644
--- a/doc/src/sgml/config.sgml
+++ b/doc/src/sgml/config.sgml
@@ -1272,6 +1272,23 @@ include_dir 'conf.d'
       </listitem>
      </varlistentry>
 
+     <varlistentry id="guc-ssl-database" xreflabel="ssl_database">
+      <term><varname>ssl_database</varname> (<type>string</type>)
+      <indexterm>
+       <primary><varname>ssl_database</varname> configuration parameter</primary>
+      </indexterm>
+      </term>
+      <listitem>
+       <para>
+        Specifies the name of the file containing the server certificates and
+        keys when using <productname>NSS</productname> for <acronym>SSL</acronym>
+        connections. This parameter can only be set in the
+        <filename>postgresql.conf</filename> file or on the server command
+        line.
+       </para>
+      </listitem>
+     </varlistentry>
+
      <varlistentry id="guc-ssl-ciphers" xreflabel="ssl_ciphers">
       <term><varname>ssl_ciphers</varname> (<type>string</type>)
       <indexterm>
@@ -1288,7 +1305,9 @@ include_dir 'conf.d'
         connections using TLS version 1.2 and lower are affected.  There is
         currently no setting that controls the cipher choices used by TLS
         version 1.3 connections.  The default value is
-        <literal>HIGH:MEDIUM:+3DES:!aNULL</literal>.  The default is usually a
+        <literal>HIGH:MEDIUM:+3DES:!aNULL</literal> for servers which have
+        been built with <productname>OpenSSL</productname> as the
+        <acronym>SSL</acronym> library.  The default is usually a
         reasonable choice unless you have specific security requirements.
        </para>
 
@@ -1490,8 +1509,11 @@ include_dir 'conf.d'
        <para>
         Sets an external command to be invoked when a passphrase for
         decrypting an SSL file such as a private key needs to be obtained.  By
-        default, this parameter is empty, which means the built-in prompting
-        mechanism is used.
+        default, this parameter is empty. When the server is using
+        <productname>OpenSSL</productname>, this means the built-in prompting
+        mechanism is used. When using <productname>NSS</productname>, there is
+        no default prompting so a blank callback will be used returning an
+        empty password.
        </para>
        <para>
         The command must print the passphrase to the standard output and exit
diff --git a/doc/src/sgml/installation.sgml b/doc/src/sgml/installation.sgml
index 66ad4ba938..3cbd125d59 100644
--- a/doc/src/sgml/installation.sgml
+++ b/doc/src/sgml/installation.sgml
@@ -976,14 +976,31 @@ build-postgresql:
        <listitem>
         <para>
          Build with support for <acronym>SSL</acronym> (encrypted)
-         connections. The only <replaceable>LIBRARY</replaceable>
-         supported is <option>openssl</option>. This requires the
-         <productname>OpenSSL</productname> package to be installed.
-         <filename>configure</filename> will check for the required
-         header files and libraries to make sure that your
-         <productname>OpenSSL</productname> installation is sufficient
-         before proceeding. 
+         connections. <replaceable>LIBRARY</replaceable> must be one of:
         </para>
+        <itemizedlist>
+         <listitem>
+          <para>
+           <option>openssl</option> to build with <productname>OpenSSL</productname> support.
+            This requires the <productname>OpenSSL</productname>
+            package to be installed.  <filename>configure</filename> will check
+            for the required header files and libraries to make sure that
+            your <productname>OpenSSL</productname> installation is sufficient
+            before proceeding.
+          </para>
+         </listitem>
+         <listitem>
+          <para>
+           <option>nss</option> to build with <productname>libnss</productname> support.
+            This requires the <productname>NSS</productname> package to be installed. Additionally,
+            <productname>NSS</productname> requires <productname>NSPR</productname>
+            to be installed. <filename>configure</filename> will check for the
+            required header files and libraries to make sure that your
+            <productname>NSS</productname> installation is sufficient before
+            proceeding.
+          </para>
+         </listitem>
+        </itemizedlist>
        </listitem>
       </varlistentry>
 
diff --git a/doc/src/sgml/libpq.sgml b/doc/src/sgml/libpq.sgml
index 5e25f20843..f84896470a 100644
--- a/doc/src/sgml/libpq.sgml
+++ b/doc/src/sgml/libpq.sgml
@@ -830,6 +830,12 @@ int callback_fn(char *buf, int size, PGconn *conn);
        <function>longjmp(...)</function>, etc. It must return normally.
       </para>
 
+      <para>
+        <function>PQsetSSLKeyPassHook_OpenSSL</function> has no effect unless
+        the server was compiled with <productname>OpenSSL</productname>
+        support.
+      </para>
+
      </listitem>
     </varlistentry>
 
@@ -846,6 +852,70 @@ PQsslKeyPassHook_OpenSSL_type PQgetSSLKeyPassHook_OpenSSL(void);
 </synopsis>
       </para>
 
+      <para>
+        <function>PQgetSSLKeyPassHook_OpenSSL</function> has no effect unless
+        the server was compiled with <productname>OpenSSL</productname>
+        support.
+      </para>
+
+     </listitem>
+    </varlistentry>
+
+    <varlistentry id="libpq-pqsetsslkeypasshook-nss">
+     <term><function>PQsetSSLKeyPassHook_nss</function><indexterm><primary>PQsetSSLKeyPassHook_nss</primary></indexterm></term>
+     <listitem>
+      <para>
+       <function>PQsetSSLKeyPassHook_nss</function> lets an application override
+       <application>libpq</application>'s default handling of password protected
+       objects in the <application>NSS</application> database using
+       <xref linkend="libpq-connect-sslpassword"/> or interactive prompting.
+
+<synopsis>
+void PQsetSSLKeyPassHook_nss(PQsslKeyPassHook_nss_type hook);
+</synopsis>
+
+       The application passes a pointer to a callback function with signature:
+<programlisting>
+char *callback_fn(PK11SlotInfo *slot, PRBool retry, void *arg);
+</programlisting>
+       which <application>libpq</application> will call
+       <emphasis>instead of</emphasis> its default
+       <function>PQdefaultSSLKeyPassHook_nss</function> password handler. The
+       callback should determine the password for the token and return a
+       pointer to it. The returned pointer should be allocated with the NSS
+       <function>PORT_Strdup</function> function. The token for which the
+       password is requested is recorded in the slot anc can be identified by
+       calling <function>PK11_GetTokenName</function>. If no password is
+       known, the callback should return <literal>NULL</literal>. The memory
+       will be owned by <productname>NSS</productname> and should not be
+       freed.
+      </para>
+
+      <para>
+        <function>PQsetSSLKeyPassHook_nss</function> has no effect unless
+        the server was compiled with <productname>NSS</productname> support.
+      </para>
+     </listitem>
+    </varlistentry>
+
+    <varlistentry id="libpq-pqgetsslkeypasshook-nss">
+     <term><function>PQgetSSLKeyPassHook_nss</function><indexterm><primary>PQgetSSLKeyPassHook_nss</primary></indexterm></term>
+     <listitem>
+      <para>
+       <function>PQgetSSLKeyPassHook_nss</function> returns the current
+       <productname>NSS</productname> password hook, or <literal>NULL</literal>
+       if none has been set.
+
+<synopsis>
+PQsslKeyPassHook_nss_type PQgetSSLKeyPassHook_nss(void);
+</synopsis>
+      </para>
+
+      <para>
+        <function>PQgetSSLKeyPassHook_nss</function> has no effect unless the
+        server was compiled with <productname>nss</productname> support.
+      </para>
+
      </listitem>
     </varlistentry>
 
@@ -1623,21 +1693,31 @@ postgresql://%2Fvar%2Flib%2Fpostgresql/dbname
         If set to 1, data sent over SSL connections will be compressed.  If
         set to 0, compression will be disabled.  The default is 0.  This
         parameter is ignored if a connection without SSL is made.
-       </para>
-
-       <para>
         SSL compression is nowadays considered insecure and its use is no
-        longer recommended.  <productname>OpenSSL</productname> 1.1.0 disables
-        compression by default, and many operating system distributions
-        disable it in prior versions as well, so setting this parameter to on
-        will not have any effect if the server does not accept compression.
-       </para>
+        longer recommended.
+        <itemizedlist>
+         <listitem>
+          <para>
+           <productname>OpenSSL</productname>: 1.1.0 disables compression by
+           default, and many operating system distributions disable it in prior
+           versions as well, so setting this parameter to on will not have any
+           effect if the server does not accept compression.
+          </para>
+          <para>
+           If security is not a primary concern, compression can improve
+           throughput if the network is the bottleneck.  Disabling compression
+           can improve response time and throughput if CPU performance is the
+           limiting factor.
+          </para>
+         </listitem>
 
-       <para>
-        If security is not a primary concern, compression can improve
-        throughput if the network is the bottleneck.  Disabling compression
-        can improve response time and throughput if CPU performance is the
-        limiting factor.
+         <listitem>
+          <para>
+           <productname>NSS</productname>: SSL compression is not supported in
+           <productname>NSS</productname>, this parameter has no effect.
+          </para>
+         </listitem>
+        </itemizedlist>
        </para>
       </listitem>
      </varlistentry>
@@ -1646,10 +1726,24 @@ postgresql://%2Fvar%2Flib%2Fpostgresql/dbname
       <term><literal>sslcert</literal></term>
       <listitem>
        <para>
-        This parameter specifies the file name of the client SSL
-        certificate, replacing the default
-        <filename>~/.postgresql/postgresql.crt</filename>.
-        This parameter is ignored if an SSL connection is not made.
+        This parameter specifies the name or location of the client SSL
+        certificate.  This parameter is ignored if an SSL connection is not
+        made.
+        <itemizedlist>
+         <listitem>
+          <para>
+           <productname>OpenSSL</productname>: can replace the default
+           <filename>~/.postgresql/postgresql.crt</filename>.
+          </para>
+         </listitem>
+
+         <listitem>
+          <para>
+           <productname>NSS</productname>: the nickname of the client SSL
+           certificate.
+          </para>
+         </listitem>
+        </itemizedlist>
        </para>
       </listitem>
      </varlistentry>
@@ -1658,15 +1752,30 @@ postgresql://%2Fvar%2Flib%2Fpostgresql/dbname
       <term><literal>sslkey</literal></term>
       <listitem>
        <para>
-        This parameter specifies the location for the secret key used for
-        the client certificate. It can either specify a file name that will
-        be used instead of the default
-        <filename>~/.postgresql/postgresql.key</filename>, or it can specify a key
-        obtained from an external <quote>engine</quote> (engines are
-        <productname>OpenSSL</productname> loadable modules).  An external engine
-        specification should consist of a colon-separated engine name and
-        an engine-specific key identifier.  This parameter is ignored if an
-        SSL connection is not made.
+        This parameter specifies the name or location for the secret key used
+        for the client certificate. This parameter is ignored if an SSL
+        connection is not made.
+        <itemizedlist>
+         <listitem>
+          <para>
+           <productname>OpenSSL</productname>: can either specify a file name
+           that will be used instead of the default
+           <filename>~/.postgresql/postgresql.key</filename>, or it can specify
+           a key obtained from an external <quote>engine</quote> (engines are
+           <productname>OpenSSL</productname> loadable modules).  An external
+           engine specification should consist of a colon-separated engine name
+           and an engine-specific key identifier.
+          </para>
+         </listitem>
+
+         <listitem>
+          <para>
+           <productname>NSS</productname>: this parameter has no effect.  Keys
+           should be loaded into the <productname>NSS</productname>
+           database.
+          </para>
+         </listitem>
+        </itemizedlist>
        </para>
       </listitem>
      </varlistentry>
@@ -1677,28 +1786,44 @@ postgresql://%2Fvar%2Flib%2Fpostgresql/dbname
        <para>
         This parameter specifies the password for the secret key specified in
         <literal>sslkey</literal>, allowing client certificate private keys
-        to be stored in encrypted form on disk even when interactive passphrase
+        to be stored in encrypted form even when interactive passphrase
         input is not practical.
-       </para>
-       <para>
-        Specifying this parameter with any non-empty value suppresses the
-        <literal>Enter PEM pass phrase:</literal>
-        prompt that <productname>OpenSSL</productname> will emit by default
-        when an encrypted client certificate key is provided to
-        <literal>libpq</literal>.
-       </para>
-       <para>
-        If the key is not encrypted this parameter is ignored. The parameter
-        has no effect on keys specified by <productname>OpenSSL</productname>
-        engines unless the engine uses the <productname>OpenSSL</productname>
-        password callback mechanism for prompts.
-       </para>
-       <para>
-        There is no environment variable equivalent to this option, and no
-        facility for looking it up in <filename>.pgpass</filename>. It can be
-        used in a service file connection definition. Users with
-        more sophisticated uses should consider using openssl engines and
-        tools like PKCS#11 or USB crypto offload devices.
+        <itemizedlist>
+         <listitem>
+          <para>
+           <productname>OpenSSL</productname>: specifying this parameter with
+           any non-empty value suppresses the
+           <literal>Enter PEM pass phrase:</literal> prompt that
+           <productname>OpenSSL</productname> will emit by default when an
+           encrypted client certificate key is provided to
+           <literal>libpq</literal>.
+          </para>
+          <para>
+           If the key is not encrypted this parameter is ignored. The parameter
+           has no effect on keys specified by <productname>OpenSSL</productname>
+           engines unless the engine uses the <productname>OpenSSL</productname>
+           password callback mechanism for prompts.
+          </para>
+          <para>
+           There is no environment variable equivalent to this option, and no
+           facility for looking it up in <filename>.pgpass</filename>. It can be
+           used in a service file connection definition. Users with
+           more sophisticated uses should consider using
+           <productname>OpenSSL</productname> engines and tools like PKCS#11 or
+           USB crypto offload devices.
+          </para>
+         </listitem>
+
+         <listitem>
+          <para>
+           <productname>NSS</productname>: specifying the parameter is required
+           in case any password protected items are referenced in the
+           <productname>NSS</productname> database, or if the database itself
+           is password protected.  If multiple different objects are password
+           protected, the same password is used for all.
+          </para>
+         </listitem>
+        </itemizedlist>
        </para>
       </listitem>
      </varlistentry>
@@ -1707,11 +1832,27 @@ postgresql://%2Fvar%2Flib%2Fpostgresql/dbname
       <term><literal>sslrootcert</literal></term>
       <listitem>
        <para>
-        This parameter specifies the name of a file containing SSL
-        certificate authority (<acronym>CA</acronym>) certificate(s).
-        If the file exists, the server's certificate will be verified
-        to be signed by one of these authorities.  The default is
-        <filename>~/.postgresql/root.crt</filename>.
+        This parameter specifies the name of SSL certificate authority
+        (<acronym>CA</acronym>) certificate(s).
+        <itemizedlist>
+         <listitem>
+          <para>
+           <productname>OpenSSL</productname>: specifies the name of a file
+           containing SSL certificate authority (<acronym>CA</acronym>)
+           certificate(s).  If the file exists, the server's certificate will
+           be verified to be signed by one of these authorities.  The default is
+           <filename>~/.postgresql/root.crt</filename>.
+          </para>
+         </listitem>
+
+         <listitem>
+          <para>
+           <productname>NSS</productname>: this parameter has no effect.  CA
+           certificates should be loaded into the <productname>NSS</productname>
+           database using the <application>certutil</application> tool.
+          </para>
+         </listitem>
+        </itemizedlist>
        </para>
       </listitem>
      </varlistentry>
@@ -1721,13 +1862,29 @@ postgresql://%2Fvar%2Flib%2Fpostgresql/dbname
       <listitem>
        <para>
         This parameter specifies the file name of the SSL certificate
-        revocation list (CRL).  Certificates listed in this file, if it
-        exists, will be rejected while attempting to authenticate the
-        server's certificate.  If neither
-        <xref linkend='libpq-connect-sslcrl'/> nor
-        <xref linkend='libpq-connect-sslcrldir'/> is set, this setting is
-        taken as
-        <filename>~/.postgresql/root.crl</filename>.
+        revocation list (CRL).  
+
+        <itemizedlist>
+         <listitem>
+          <para>
+           <productname>OpenSSL</productname>: Certificates listed in this file,
+           if it exists, will be rejected while attempting to authenticate the
+           server's certificate.  If neither
+           <xref linkend='libpq-connect-sslcrl'/> nor
+           <xref linkend='libpq-connect-sslcrldir'/> is set, this setting is
+           taken as <filename>~/.postgresql/root.crl</filename>. 
+          </para>
+         </listitem>
+
+         <listitem>
+          <para>
+           <productname>NSS</productname>: This parameter has no effect.  CRL
+           files should be loaded into the <productname>NSS</productname>
+           database using the <application>crlutil</application> tool.
+          </para>
+         </listitem>
+        </itemizedlist>
+
        </para>
       </listitem>
      </varlistentry>
@@ -1740,18 +1897,30 @@ postgresql://%2Fvar%2Flib%2Fpostgresql/dbname
         revocation list (CRL).  Certificates listed in the files in this
         directory, if it exists, will be rejected while attempting to
         authenticate the server's certificate.
-       </para>
 
-       <para>
-        The directory needs to be prepared with the OpenSSL command
-        <literal>openssl rehash</literal> or <literal>c_rehash</literal>.  See
-        its documentation for details.
-       </para>
+        <itemizedlist>
+         <listitem>
+          <para>
+           <productname>OpenSSL</productname>: the directory needs to be
+           prepared with the OpenSSL command <literal>openssl rehash</literal>
+           or <literal>c_rehash</literal>.  See its documentation for details.
+          </para>
+          <para>
+           Both <literal>sslcrl</literal> and <literal>sslcrldir</literal> can
+           be specified together.
+          </para>
+         </listitem>
 
-       <para>
-        Both <literal>sslcrl</literal> and <literal>sslcrldir</literal> can be
-        specified together.
+         <listitem>
+          <para>
+           <productname>NSS</productname>: This parameter has no effect.  CRL
+           files should be loaded into the <productname>NSS</productname>
+           database using the <application>crlutil</application> tool.
+          </para>
+         </listitem>
+        </itemizedlist>
        </para>
+
       </listitem>
      </varlistentry>
 
@@ -1786,8 +1955,8 @@ postgresql://%2Fvar%2Flib%2Fpostgresql/dbname
         for the connection. Valid values are <literal>TLSv1</literal>,
         <literal>TLSv1.1</literal>, <literal>TLSv1.2</literal> and
         <literal>TLSv1.3</literal>. The supported protocols depend on the
-        version of <productname>OpenSSL</productname> used, older versions
-        not supporting the most modern protocol versions. If not specified,
+        version of the SSL library used, older versions may 
+        not support the most modern protocol versions. If not specified,
         the default is <literal>TLSv1.2</literal>, which satisfies industry
         best practices as of this writing.
        </para>
@@ -1802,8 +1971,8 @@ postgresql://%2Fvar%2Flib%2Fpostgresql/dbname
         for the connection. Valid values are <literal>TLSv1</literal>,
         <literal>TLSv1.1</literal>, <literal>TLSv1.2</literal> and
         <literal>TLSv1.3</literal>. The supported protocols depend on the
-        version of <productname>OpenSSL</productname> used, older versions
-        not supporting the most modern protocol versions. If not set, this
+        version of the SSL library used, older versions
+        may not support the most modern protocol versions. If not set, this
         parameter is ignored and the connection will use the maximum bound
         defined by the backend, if set. Setting the maximum protocol version
         is mainly useful for testing or if some component has issues working
@@ -2523,6 +2692,8 @@ void *PQsslStruct(const PGconn *conn, const char *struct_name);
       </para>
       <para>
        The struct(s) available depend on the SSL implementation in use.
+      </para>
+      <para>
        For <productname>OpenSSL</productname>, there is one struct,
        available under the name "OpenSSL", and it returns a pointer to the
        <productname>OpenSSL</productname> <literal>SSL</literal> struct.
@@ -2546,9 +2717,14 @@ void *PQsslStruct(const PGconn *conn, const char *struct_name);
 ]]></programlisting>
       </para>
       <para>
-       This structure can be used to verify encryption levels, check server
-       certificates, and more. Refer to the <productname>OpenSSL</productname>
-       documentation for information about this structure.
+       For <productname>NSS</productname>, there is one struct available under
+       the name "NSS", and it returns a pointer to the
+       <productname>NSS</productname> <literal>PRFileDesc</literal>.
+      </para>
+      <para>
+       These structures can be used to verify encryption levels, check server
+       certificates, and more. Refer to the <acronym>SSL</acronym> library
+       documentation for information about these structures.
       </para>
      </listitem>
     </varlistentry>
@@ -2575,6 +2751,10 @@ void *PQgetssl(const PGconn *conn);
        <xref linkend="libpq-PQsslInUse"/> instead, and for more details about the
        connection, use <xref linkend="libpq-PQsslAttribute"/>.
       </para>
+      <para>
+       This function returns <literal>NULL</literal> when <acronym>SSL</acronym>
+       librariaes other than <productname>OpenSSL</productname> are used.
+      </para>
      </listitem>
     </varlistentry>
 
@@ -8008,6 +8188,11 @@ void PQinitOpenSSL(int do_ssl, int do_crypto);
        before first opening a database connection.  Also be sure that you
        have done that initialization before opening a database connection.
       </para>
+
+      <para>
+       This function does nothing when using <productname>NSS</productname> as
+       the <acronym>SSL</acronym> library.
+      </para>
      </listitem>
     </varlistentry>
 
@@ -8034,6 +8219,11 @@ void PQinitSSL(int do_ssl);
        might be preferable for applications that need to work with older
        versions of <application>libpq</application>.
       </para>
+
+      <para>
+       This function does nothing when using <productname>NSS</productname> as
+       the <acronym>SSL</acronym> library.
+      </para>
      </listitem>
     </varlistentry>
    </variablelist>
diff --git a/doc/src/sgml/runtime.sgml b/doc/src/sgml/runtime.sgml
index bf877c0e0c..1fcad17a51 100644
--- a/doc/src/sgml/runtime.sgml
+++ b/doc/src/sgml/runtime.sgml
@@ -2185,15 +2185,21 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
 
   <indexterm zone="ssl-tcp">
    <primary>SSL</primary>
+   <secondary>TLS</secondary>
   </indexterm>
 
   <para>
    <productname>PostgreSQL</productname> has native support for using
    <acronym>SSL</acronym> connections to encrypt client/server communications
    for increased security. This requires that
-   <productname>OpenSSL</productname> is installed on both client and
+   a supported TLS library is installed on both client and
    server systems and that support in <productname>PostgreSQL</productname> is
    enabled at build time (see <xref linkend="installation"/>).
+   Supported libraries are <productname>OpenSSL</productname> and
+   <productname>NSS</productname>. The terms <acronym>SSL</acronym> and
+   <acronym>TLS</acronym> are often used interchangeably to mean a secure
+   connection using a <acronym>TLS</acronym> protocol, even though
+   <acronym>SSL</acronym> protocols are no longer supported.
   </para>
 
   <sect2 id="ssl-setup">
@@ -2213,8 +2219,13 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
   </para>
 
   <para>
-   To start in <acronym>SSL</acronym> mode, files containing the server certificate
-   and private key must exist.  By default, these files are expected to be
+   To start in <acronym>SSL</acronym> mode, a server certificate
+   and private key must exist. The below sections on the different libraries
+   will discuss how to configure these.
+  </para>
+   
+  <para>
+   By default, these files are expected to be
    named <filename>server.crt</filename> and <filename>server.key</filename>, respectively, in
    the server's data directory, but other names and locations can be specified
    using the configuration parameters <xref linkend="guc-ssl-cert-file"/>
@@ -2304,6 +2315,18 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
   </note>
   </sect2>
 
+  <sect2 id="ssl-nss-config">
+   <title>NSS Configuration</title>
+
+  <para>
+   <productname>PostgreSQL</productname> will look for certificates and keys
+   in the <productname>NSS</productname> database specified by the parameter
+   <xref linkend="guc-ssl-database"/> in <filename>postgresql.conf</filename>.
+   The parameters for certificate and key filenames are used to identify the
+   nicknames in the database.
+  </para>
+  </sect2>
+
   <sect2 id="ssl-client-certificates">
    <title>Using Client Certificates</title>
 
@@ -2378,7 +2401,7 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
   </sect2>
 
   <sect2 id="ssl-server-files">
-   <title>SSL Server File Usage</title>
+   <title>SSL Server File Parameter Usage</title>
 
    <para>
     <xref linkend="ssl-file-usage"/> summarizes the files that are
@@ -2425,6 +2448,14 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
       <entry>client certificate must not be on this list</entry>
      </row>
 
+     <row>
+      <entry><xref linkend="guc-ssl-database"/></entry>
+      <entry>certificate database</entry>
+      <entry>contains server certificates, keys and revocation lists; only
+      used when <productname>PostgreSQL</productname> is built with support
+      for <productname>NSS</productname>.</entry>
+     </row>
+
     </tbody>
    </tgroup>
   </table>
@@ -2448,7 +2479,7 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
   </sect2>
 
   <sect2 id="ssl-certificate-creation">
-   <title>Creating Certificates</title>
+   <title>Creating Certificates with OpenSSL</title>
 
    <para>
      To create a simple self-signed certificate for the server, valid for 365
@@ -2552,6 +2583,89 @@ openssl x509 -req -in server.csr -text -days 365 \
    </para>
   </sect2>
 
+  <sect2 id="nss-certificate-database">
+   <title>NSS Certificate Databases</title>
+
+   <para>
+    When using <productname>NSS</productname>, all certificates and keys must
+    be loaded into an <productname>NSS</productname> certificate database.
+   </para>
+
+   <para>
+    To create a new <productname>NSS</productname> certificate database and
+    load the certificates created in <xref linkend="ssl-certificate-creation" />,
+    use the following <productname>NSS</productname> commands:
+<programlisting>
+certutil -d "sql:server.db" -N --empty-password
+certutil -d "sql:server.db" -A -n server.crt -i server.crt -t "CT,C,C"
+certutil -d "sql:server.db" -A -n root.crt -i root.crt -t "CT,C,C"
+</programlisting>
+    This will give the certificate the filename as the nickname identifier in
+    the database which is created as <filename>server.db</filename>.
+   </para>
+   <para>
+    Then load the server key, which require converting it to
+    <acronym>PKCS#12</acronym> format using the
+    <productname>OpenSSL</productname> tools:
+<programlisting>
+openssl pkcs12 -export -out server.pfx -inkey server.key -in server.crt \
+  -certfile root.crt -passout pass:
+pk12util -i server.pfx -d server.db -W ''
+</programlisting>
+   </para>
+   <para>
+    Finally a certificate revocation list can be loaded with the following
+    commands:
+<programlisting>
+crlutil -I -i server.crl -d server.db -B
+</programlisting>
+   </para>
+  </sect2>
+
+  <sect2 id="nss-ssl-certificate-creation">
+   <title>Creating Certificates with NSS</title>
+
+   <para>
+    To create a simple self-signed CA and certificate for the server, use the
+    following NSS commands. Replace
+    <replaceable>*.yourdomain.com</replaceable> with the server's host
+    name. Remove <replaceable>--empty-password</replaceable> in order to set
+    a password protecting the databases. The password can be passed to
+    <application>certutil</application> with the <literal>-f</literal> parameter.
+    First create a self-signed CA. To use a different certificate validity
+    time than the default, use <replaceable>-v</replaceable> to specify the
+    number of months of validity.
+<programlisting>
+mkdir root_ca.db
+certutil -N -d "sql:root_ca.db/" --empty-password
+certutil -S -d "sql:root_ca.db/" -n root_ca -s "CN=<replaceable>ca.yourdomain.com</replaceable>" \
+  -x -k rsa -g 2048 -m <replaceable>5432</replaceable> -t CTu,CTu,CTu \
+  --keyUsage certSigning -2 --nsCertType sslCA,smimeCA,objectSigningCA \
+  -Z SHA256
+certutil -L -d "sql:root_ca.db/" -n root_ca -a > root_ca.pem
+</programlisting>
+    Now create a server certificate database, and create a certificate signing
+    request for the CA. Then sign the request with the already created CA and
+    insert the certificate chain into the certificate database.
+<programlisting>
+mkdir server_cert.db
+certutil -N -d "sql:server_cert.db/" --empty-password
+certutil -R -d "sql:server_cert.db/" -s "CN=dbhost.yourdomain.com" \
+  -o server_cert.csr -g 2048 -Z SHA256
+
+certutil -C -d "sql:root_ca.db/" -c root_ca -i server_cert.csr \
+  -o server_cert.der -m <replaceable>5433</replaceable> \
+  --keyUsage keyEncipherment,dataEncipherment,digitalSignature \
+  --nsCertType sslServer -Z SHA256
+
+certutil -A -d "sql:server_cert.db/" -n root_ca -t CTu,CTu,CTu -a -i root_ca.pem
+certutil -A -d "sql:server_cert.db/" -n server_cert -t CTu,CTu,CTu -i server_cert.der
+</programlisting>
+    The server certificate is loaded into the certificate database as well as
+    the CA certificate in order to provide the chain of certificates.
+   </para>
+  </sect2>
+
  </sect1>
 
  <sect1 id="gssapi-enc">
-- 
2.21.1 (Apple Git-122.3)

From 92a89e2af330650b7307ac85447e07dd1f809b45 Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Mon, 8 Feb 2021 23:52:39 +0100
Subject: [PATCH v28 4/9] nss: pg_strong_random support

This adds support for using the RNG in libnss as a backend for
pg_strong_random.
---
 src/port/pg_strong_random.c | 50 ++++++++++++++++++++++++++++++++++++-
 1 file changed, 49 insertions(+), 1 deletion(-)

diff --git a/src/port/pg_strong_random.c b/src/port/pg_strong_random.c
index 07f24c0089..40de237628 100644
--- a/src/port/pg_strong_random.c
+++ b/src/port/pg_strong_random.c
@@ -137,7 +137,55 @@ pg_strong_random(void *buf, size_t len)
 	return false;
 }
 
-#else							/* not USE_OPENSSL or WIN32 */
+#elif defined(USE_NSS)
+
+#define pg_BITS_PER_BYTE BITS_PER_BYTE
+#undef BITS_PER_BYTE
+#define NO_NSPR_10_SUPPORT
+#include <nss/nss.h>
+#include <nss/pk11pub.h>
+#if defined(BITS_PER_BYTE)
+#if BITS_PER_BYTE != pg_BITS_PER_BYTE
+#error "incompatible byte widths between NSPR and postgres"
+#endif
+#else
+#define BITS_PER_BYTE pg_BITS_PER_BYTE
+#endif
+#undef pg_BITS_PER_BYTE
+
+void
+pg_strong_random_init(void)
+{
+	/* No initialization needed on NSS */
+}
+
+bool
+pg_strong_random(void *buf, size_t len)
+{
+	NSSInitParameters params;
+	NSSInitContext *nss_context;
+	SECStatus	status;
+
+	memset(&params, 0, sizeof(params));
+	params.length = sizeof(params);
+	nss_context = NSS_InitContext("", "", "", "", &params,
+								  NSS_INIT_READONLY | NSS_INIT_NOCERTDB |
+								  NSS_INIT_NOMODDB | NSS_INIT_FORCEOPEN |
+								  NSS_INIT_NOROOTINIT | NSS_INIT_PK11RELOAD);
+
+	if (!nss_context)
+		return false;
+
+	status = PK11_GenerateRandom(buf, len);
+	NSS_ShutdownContext(nss_context);
+
+	if (status == SECSuccess)
+		return true;
+
+	return false;
+}
+
+#else							/* not USE_OPENSSL, USE_NSS or WIN32 */
 
 /*
  * Without OpenSSL or Win32 support, just read /dev/urandom ourselves.
-- 
2.21.1 (Apple Git-122.3)

From 42f6b684ca1ae89c7a6aab3da74b6eeab583c51d Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Mon, 8 Feb 2021 23:52:37 +0100
Subject: [PATCH v28 3/9] nss: Add NSS specific tests

This adds the SSL/Backend/NSS which implements the setup and teardown
required as well as adds the NSS configuration to the existing tests.

The OpenSSL testfiles are reused by repackaging them into NSS databases
in order for the tests to be cross-library. Additional testfiles are
generated by using only the NSS toolchain as well as rudimentary tests
using these.
---
 src/test/ssl/Makefile                 | 244 ++++++++++++++++++
 src/test/ssl/t/001_ssltests.pl        | 350 ++++++++++++++++++--------
 src/test/ssl/t/002_scram.pl           |  31 ++-
 src/test/ssl/t/SSL/Backend/NSS.pm     |  61 +++++
 src/test/ssl/t/SSL/Backend/OpenSSL.pm |  21 +-
 src/test/ssl/t/SSL/Server.pm          |  44 +---
 6 files changed, 586 insertions(+), 165 deletions(-)
 create mode 100644 src/test/ssl/t/SSL/Backend/NSS.pm

diff --git a/src/test/ssl/Makefile b/src/test/ssl/Makefile
index 4b53fdf6c0..8d4afa9dd0 100644
--- a/src/test/ssl/Makefile
+++ b/src/test/ssl/Makefile
@@ -33,6 +33,36 @@ SSLFILES := $(CERTIFICATES:%=ssl/%.key) $(CERTIFICATES:%=ssl/%.crt) \
 SSLDIRS := ssl/client-crldir ssl/server-crldir \
 	ssl/root+client-crldir ssl/root+server-crldir
 
+# Even though we in practice could get away with far fewer NSS databases, they
+# are generated to mimic the setup for the OpenSSL tests in order to ensure
+# we isolate the same behavior between the backends. The database name should
+# contain the files included for easier test suite code reading.
+NSSFILES := ssl/nss/client_ca.crt.db \
+	ssl/nss/server_ca.crt.db \
+	ssl/nss/root+server_ca.crt.db \
+	ssl/nss/root+client_ca.crt.db \
+	ssl/nss/client.crt__client.key.db \
+	ssl/nss/client-revoked.crt__client-revoked.key.db \
+	ssl/nss/server-cn-only.crt__server-password.key.db \
+	ssl/nss/server-cn-only.crt__server-cn-only.key.db \
+	ssl/nss/root.crl \
+	ssl/nss/server.crl \
+	ssl/nss/client.crl \
+	ssl/nss/server-multiple-alt-names.crt__server-multiple-alt-names.key.db \
+	ssl/nss/server-single-alt-name.crt__server-single-alt-name.key.db \
+	ssl/nss/server-cn-and-alt-names.crt__server-cn-and-alt-names.key.db \
+	ssl/nss/server-no-names.crt__server-no-names.key.db \
+	ssl/nss/server-revoked.crt__server-revoked.key.db \
+	ssl/nss/root+client.crl \
+	ssl/nss/client+client_ca.crt__client.key.db \
+	ssl/nss/client.crt__client-encrypted-pem.key.db \
+	ssl/nss/root+server_ca.crt__server.crl.db \
+	ssl/nss/root+server_ca.crt__root+server.crl.db \
+	ssl/nss/root+server_ca.crt__root+server.crldir.db \
+	ssl/nss/native_ca-root.db \
+	ssl/nss/native_server-root.db \
+	ssl/nss/native_client-root.db
+
 # This target re-generates all the key and certificate files. Usually we just
 # use the ones that are committed to the tree without rebuilding them.
 #
@@ -40,6 +70,10 @@ SSLDIRS := ssl/client-crldir ssl/server-crldir \
 #
 sslfiles: $(SSLFILES) $(SSLDIRS)
 
+# Generate NSS certificate databases corresponding to the OpenSSL certificates.
+# This target will fail unless preceded by nssfiles-clean.
+nssfiles: $(NSSFILES)
+
 # OpenSSL requires a directory to put all generated certificates in. We don't
 # use this for anything, but we need a location.
 ssl/new_certs_dir:
@@ -67,6 +101,35 @@ ssl/%_ca.crt: ssl/%_ca.key %_ca.config ssl/root_ca.crt ssl/new_certs_dir
 	rm ssl/temp_ca.crt ssl/temp_ca_signed.crt
 	echo "01" > ssl/$*_ca.srl
 
+ssl/nss/%_ca.crt.db: ssl/%_ca.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n $*_ca.crt -i ssl/$*_ca.crt -t "CT,C,C"
+
+ssl/nss/root+server_ca.crt__server.crl.db: ssl/root+server_ca.crt ssl/nss/server.crl
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	crlutil -I -i ssl/nss/server.crl -d $@ -B
+
+ssl/nss/root+server_ca.crt__root+server.crl.db: ssl/root+server_ca.crt ssl/nss/root.crl ssl/nss/server.crl
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	crlutil -I -i ssl/nss/root.crl -d $@ -B
+	crlutil -I -i ssl/nss/server.crl -d $@ -B
+
+ssl/nss/root+server_ca.crt__root+server.crldir.db: ssl/root+server_ca.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	crlutil -I -i ssl/nss/root.crl -d $@ -B
+	for c in $(shell ls ssl/root+server-crldir) ; do \
+		echo $${c} ; \
+		openssl crl -in ssl/root+server-crldir/$${c} -outform der -out ssl/nss/$${c} ; \
+		crlutil -I -i ssl/nss/$${c} -d $@ -B ; \
+	done
+
 # Server certificates, signed by server CA:
 ssl/server-%.crt: ssl/server-%.key ssl/server_ca.crt server-%.config
 	openssl req -new -key ssl/server-$*.key -out ssl/server-$*.csr -config server-$*.config
@@ -80,6 +143,86 @@ ssl/server-ss.crt: ssl/server-cn-only.key ssl/server-cn-only.crt server-cn-only.
 	openssl x509 -req -days 10000 -in ssl/server-ss.csr -signkey ssl/server-cn-only.key -out ssl/server-ss.crt  -extensions v3_req -extfile server-cn-only.config
 	rm ssl/server-ss.csr
 
+# pk12util won't preserve the password when importing the password protected
+# key, the password must be set on the database *before* importing it as the
+# password in the pkcs12 envelope will be dropped.
+ssl/nss/server-cn-only.crt__server-password.key.db: ssl/server-cn-only.crt
+	$(MKDIR_P) $@
+	echo "secret1" > password.txt
+	certutil -d "sql:$@" -N -f password.txt
+	certutil -d "sql:$@" -A -n ssl/server-cn-only.crt -i ssl/server-cn-only.crt -t "CT,C,C" -f password.txt
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C" -f password.txt
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C" -f password.txt
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C" -f password.txt
+	openssl pkcs12 -export -out ssl/nss/server-password.pfx -inkey ssl/server-password.key -in ssl/server-cn-only.crt -certfile ssl/server_ca.crt -passin 'pass:secret1' -passout 'pass:secret1'
+	pk12util -i ssl/nss/server-password.pfx -d "sql:$@" -W 'secret1' -K 'secret1'
+
+ssl/nss/server-cn-only.crt__server-cn-only.key.db: ssl/server-cn-only.crt ssl/server-cn-only.key
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-cn-only.crt -i ssl/server-cn-only.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-cn-only.pfx -inkey ssl/server-cn-only.key -in ssl/server-cn-only.crt -certfile ssl/server_ca.crt -passout pass:
+	pk12util -i ssl/nss/server-cn-only.pfx -d "sql:$@" -W ''
+
+ssl/nss/server-cn-only.crt__server-cn-only.key.crldir.db: ssl/nss/server-cn-only.crt__server-cn-only.key.db
+	for c in $(shell ls ssl/root+client-crldir) ; do \
+		echo $${c} ; \
+		openssl crl -in ssl/root+client-crldir/$${c} -outform der -out ssl/nss/$${c} ; \
+		crlutil -I -i ssl/nss/$${c} -d $@ -B ; \
+	done
+
+ssl/nss/server-multiple-alt-names.crt__server-multiple-alt-names.key.db: ssl/server-multiple-alt-names.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-multiple-alt-names.crt -i ssl/server-multiple-alt-names.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-multiple-alt-names.pfx -inkey ssl/server-multiple-alt-names.key -in ssl/server-multiple-alt-names.crt -certfile ssl/server-multiple-alt-names.crt -passout pass:
+	pk12util -i ssl/nss/server-multiple-alt-names.pfx -d "sql:$@" -W ''
+
+ssl/nss/server-single-alt-name.crt__server-single-alt-name.key.db: ssl/server-single-alt-name.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-single-alt-name.crt -i ssl/server-single-alt-name.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-single-alt-name.pfx -inkey ssl/server-single-alt-name.key -in ssl/server-single-alt-name.crt -certfile ssl/server-single-alt-name.crt -passout pass:
+	pk12util -i ssl/nss/server-single-alt-name.pfx -d "sql:$@" -W ''
+
+ssl/nss/server-cn-and-alt-names.crt__server-cn-and-alt-names.key.db: ssl/server-cn-and-alt-names.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-cn-and-alt-names.crt -i ssl/server-cn-and-alt-names.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-cn-and-alt-names.pfx -inkey ssl/server-cn-and-alt-names.key -in ssl/server-cn-and-alt-names.crt -certfile ssl/server-cn-and-alt-names.crt -passout pass:
+	pk12util -i ssl/nss/server-cn-and-alt-names.pfx -d $@ -W ''
+
+ssl/nss/server-no-names.crt__server-no-names.key.db: ssl/server-no-names.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-no-names.crt -i ssl/server-no-names.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-no-names.pfx -inkey ssl/server-no-names.key -in ssl/server-no-names.crt -certfile ssl/server-no-names.crt -passout pass:
+	pk12util -i ssl/nss/server-no-names.pfx -d "sql:$@" -W ''
+
+ssl/nss/server-revoked.crt__server-revoked.key.db: ssl/server-revoked.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-revoked.crt -i ssl/server-revoked.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-revoked.pfx -inkey ssl/server-revoked.key -in ssl/server-revoked.crt -certfile ssl/server-revoked.crt -passout pass:
+	pk12util -i ssl/nss/server-revoked.pfx -d "sql:$@" -W ''
+
 # Password-protected version of server-cn-only.key
 ssl/server-password.key: ssl/server-cn-only.key
 	openssl rsa -aes256 -in $< -out $@ -passout 'pass:secret1'
@@ -91,6 +234,27 @@ ssl/client.crt: ssl/client.key ssl/client_ca.crt
 	openssl x509 -in ssl/temp.crt -out ssl/client.crt # to keep just the PEM cert
 	rm ssl/client.csr ssl/temp.crt
 
+# Client certificate, signed by client CA
+ssl/nss/client.crt__client.key.db: ssl/client.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/client.crt -i ssl/client.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root+client_ca.crt -i ssl/root+client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client.pfx -inkey ssl/client.key -in ssl/client.crt -certfile ssl/client_ca.crt -passout pass:
+	pk12util -i ssl/nss/client.pfx -d "sql:$@" -W ''
+
+# Client certificate with encrypted key, signed by client CA
+ssl/nss/client.crt__client-encrypted-pem.key.db: ssl/client.crt
+	$(MKDIR_P) $@
+	echo 'dUmmyP^#+' > $@.pass
+	certutil -d "sql:$@" -N -f $@.pass
+	certutil -d "sql:$@" -A -f $@.pass -n ssl/client.crt -i ssl/client.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -f $@.pass -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -f $@.pass -n root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client-encrypted-pem.pfx -inkey ssl/client-encrypted-pem.key -in ssl/client.crt -certfile ssl/client_ca.crt -passin pass:'dUmmyP^#+' -passout pass:'dUmmyP^#+'
+	pk12util -i ssl/nss/client-encrypted-pem.pfx -d "sql:$@" -W 'dUmmyP^#+' -k $@.pass
+
 # Another client certificate, signed by the client CA. This one is revoked.
 ssl/client-revoked.crt: ssl/client-revoked.key ssl/client_ca.crt client.config
 	openssl req -new -key ssl/client-revoked.key -out ssl/client-revoked.csr -config client.config
@@ -98,6 +262,14 @@ ssl/client-revoked.crt: ssl/client-revoked.key ssl/client_ca.crt client.config
 	openssl x509 -in ssl/temp.crt -out ssl/client-revoked.crt # to keep just the PEM cert
 	rm ssl/client-revoked.csr ssl/temp.crt
 
+ssl/nss/client-revoked.crt__client-revoked.key.db: ssl/client-revoked.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/client-revoked.crt -i ssl/client-revoked.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client-revoked.pfx -inkey ssl/client-revoked.key -in ssl/client-revoked.crt -certfile ssl/client_ca.crt -passout pass:
+	pk12util -i ssl/nss/client-revoked.pfx -d "sql:$@" -W ''
+
 # Convert the key to DER, to test our behaviour there too
 ssl/client-der.key: ssl/client.key
 	openssl rsa -in ssl/client.key -outform DER -out ssl/client-der.key
@@ -130,19 +302,40 @@ ssl/root+client_ca.crt: ssl/root_ca.crt ssl/client_ca.crt
 ssl/client+client_ca.crt: ssl/client.crt ssl/client_ca.crt
 	cat $^ > $@
 
+# Client certificate, signed by client CA
+ssl/nss/client+client_ca.crt__client.key.db: ssl/client+client_ca.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/client+client_ca.crt -i ssl/client+client_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n ssl/root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client.pfx -inkey ssl/client.key -in ssl/client.crt -certfile ssl/client_ca.crt -passout pass:
+	pk12util -i ssl/nss/client.pfx -d "sql:$@" -W ''
+
 #### CRLs
 
 ssl/client.crl: ssl/client-revoked.crt
 	openssl ca -config cas.config -name client_ca -revoke ssl/client-revoked.crt
 	openssl ca -config cas.config -name client_ca -gencrl -out ssl/client.crl
 
+ssl/nss/client.crl: ssl/client.crl
+	openssl crl -in $^ -outform der -out $@
+
 ssl/server.crl: ssl/server-revoked.crt
 	openssl ca -config cas.config -name server_ca -revoke ssl/server-revoked.crt
 	openssl ca -config cas.config -name server_ca -gencrl -out ssl/server.crl
 
+ssl/nss/server.crl: ssl/server.crl
+	openssl crl -in $^ -outform der -out $@
+
 ssl/root.crl: ssl/root_ca.crt
 	openssl ca -config cas.config -name root_ca -gencrl -out ssl/root.crl
 
+ssl/nss/root.crl: ssl/root.crl
+	openssl crl -in $^ -outform der -out $@
+
+ssl/nss/root+client.crl: ssl/root+client.crl
+	openssl crl -in $^ -outform der -out $@
+
 # If a CRL is used, OpenSSL requires a CRL file for *all* the CAs in the
 # chain, even if some of them are empty.
 ssl/root+server.crl: ssl/root.crl ssl/server.crl
@@ -168,14 +361,65 @@ ssl/client-crldir: ssl/client.crl
 	mkdir ssl/client-crldir
 	cp ssl/client.crl ssl/client-crldir/`openssl crl -hash -noout -in ssl/client.crl`.r0
 
+#### NSS specific certificates and keys
+
+ssl/nss/native_ca-%.db:
+	$(MKDIR_P) ssl/nss/native_ca-$*.db
+	certutil -N -d "sql:ssl/nss/native_ca-$*.db/" --empty-password
+	echo y > nss_ca_params.txt
+	echo 10 >> nss_ca_params.txt
+	echo y >> nss_ca_params.txt
+	cat nss_ca_params.txt | certutil -S -d "sql:ssl/nss/native_ca-$*.db/" -n ca-$* \
+	-s "CN=Test CA for PostgreSQL SSL regression tests,OU=PostgreSQL test suite" \
+	-x -k rsa -g 2048 -m 5432 -t CTu,CTu,CTu \
+	--keyUsage certSigning -2 --nsCertType sslCA,smimeCA,objectSigningCA \
+	-z Makefile -Z SHA256
+	rm nss_ca_params.txt
+
+ssl/nss/native_ca-%.pem: ssl/nss/native_ca-%.db
+	certutil -L -d "sql:ssl/nss/native_ca-$*.db/" -n ca-$* -a > ssl/nss/native_ca-$*.pem
+
+# Create and sign a server certificate
+ssl/nss/native_server-%.db: ssl/nss/native_ca-%.pem
+	$(MKDIR_P) ssl/nss/native_server-$*.db
+	certutil -N -d "sql:ssl/nss/native_server-$*.db/" --empty-password
+	certutil -R -d "sql:ssl/nss/native_server-$*.db/" \
+		-s "CN=common-name.pg-ssltest.test,OU=PostgreSQL test suite" \
+		-o ssl/nss/native_server-$*.csr -g 2048 -Z SHA256 -z Makefile
+	echo 1 > nss_server_params.txt
+	echo 9 >> nss_server_params.txt
+	cat nss_server_params.txt | certutil -C -d "sql:ssl/nss/native_ca-$*.db/" -c ca-root -i ssl/nss/native_server-$*.csr \
+		-o ssl/nss/native_server_$*.der -m 5433 --keyUsage dataEncipherment,digitalSignature,keyEncipherment \
+		--nsCertType sslServer --certVersion 1 -Z SHA256
+	certutil -A -d "sql:ssl/nss/native_server-$*.db/" -n ca-$* -t CTu,CTu,CTu -a -i ssl/nss/native_ca-$*.pem
+	certutil -A -d "sql:ssl/nss/native_server-$*.db/" -n ssl/native_server-$*.crt -t CTu,CTu,CTu -i ssl/nss/native_server_$*.der
+	rm nss_server_params.txt
+
+# Create and sign a client certificate
+ssl/nss/native_client-%.db: ssl/nss/native_ca-%.pem
+	$(MKDIR_P) ssl/nss/native_client-$*.db
+	certutil -N -d "sql:ssl/nss/native_client-$*.db/" --empty-password
+	certutil -R -d "sql:ssl/nss/native_client-$*.db/" -s "CN=ssltestuser,OU=PostgreSQL test suite" \
+		-o ssl/nss/native_client-$*.csr -g 2048 -Z SHA256 -z Makefile
+	certutil -C -d "sql:ssl/nss/native_ca-$*.db/" -c ca-$* -i ssl/nss/native_client-$*.csr -o ssl/nss/native_client-$*.der \
+		-m 5434 --keyUsage keyEncipherment,dataEncipherment,digitalSignature --nsCertType sslClient \
+		--certVersion 1 -Z SHA256
+	certutil -A -d "sql:ssl/nss/native_client-$*.db" -n ca-$* -t CTu,CTu,CTu -a -i ssl/nss/native_ca-$*.pem
+	certutil -A -d "sql:ssl/nss/native_client-$*.db" -n native_client-$* -t CTu,CTu,CTu -i ssl/nss/native_client-$*.der
+
 .PHONY: sslfiles-clean
 sslfiles-clean:
 	rm -f $(SSLFILES) ssl/client_ca.srl ssl/server_ca.srl ssl/client_ca-certindex* ssl/server_ca-certindex* ssl/root_ca-certindex* ssl/root_ca.srl ssl/temp_ca.crt ssl/temp_ca_signed.crt
 	rm -rf $(SSLDIRS)
 
+.PHONY: nssfiles-clean
+nssfiles-clean:
+	rm -rf ssl/nss
+
 clean distclean maintainer-clean:
 	rm -rf tmp_check
 	rm -rf ssl/*.old ssl/new_certs_dir ssl/client*_tmp.key
+	rm -rf ssl/nss
 
 # Doesn't depend on $(SSLFILES) because we don't rebuild them by default
 check:
diff --git a/src/test/ssl/t/001_ssltests.pl b/src/test/ssl/t/001_ssltests.pl
index 30b68bddbe..dbd49817da 100644
--- a/src/test/ssl/t/001_ssltests.pl
+++ b/src/test/ssl/t/001_ssltests.pl
@@ -9,13 +9,22 @@ use lib $FindBin::RealBin;
 
 use SSL::Server;
 
-if ($ENV{with_ssl} ne 'openssl')
+my $openssl;
+my $nss;
+
+if ($ENV{with_ssl} eq 'openssl')
+{
+	$openssl = 1;
+	plan tests => 100;
+}
+elsif ($ENV{with_ssl} eq 'nss')
 {
-	plan skip_all => 'OpenSSL not supported by this build';
+	$nss = 1;
+	plan tests => 106;
 }
 else
 {
-	plan tests => 100;
+	plan skip_all => 'SSL not supported by this build';
 }
 
 #### Some configuration
@@ -51,19 +60,78 @@ configure_test_server_for_ssl($node, $SERVERHOSTADDR, $SERVERHOSTCIDR,
 
 note "testing password-protected keys";
 
-set_server_cert($node, 'server-cn-only', 'root+client_ca',
-				   'server-password', 'echo wrongpassword');
-command_fails(
-	[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
-	'restart fails with password-protected key file with wrong password');
-$node->_update_pid(0);
+# Since the passphrase callbacks operate at different stages in OpenSSL and
+# NSS we have two separate blocks for them
+SKIP:
+{
+	skip "Certificate passphrases aren't checked on server restart in NSS", 2
+	  if ($nss);
+
+	switch_server_cert($node,
+		certfile => 'server-cn-only',
+		cafile => 'root+client_ca',
+		keyfile => 'server-password',
+		nssdatabase => 'server-cn-only.crt__server-password.key.db',
+		passphrase_cmd => 'echo wrongpassword');
+
+	command_fails(
+		[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
+		'restart fails with password-protected key file with wrong password');
+	$node->_update_pid(0);
+
+	switch_server_cert($node,
+		certfile => 'server-cn-only',
+		cafile => 'root+client_ca',
+		keyfile => 'server-password',
+		nssdatabase => 'server-cn-only.crt__server-password.key.db',
+		passphrase_cmd => 'echo secret1');
+
+	command_ok(
+		[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
+		'restart succeeds with password-protected key file');
+	$node->_update_pid(1);
+}
 
-set_server_cert($node, 'server-cn-only', 'root+client_ca',
-				'server-password', 'echo secret1');
-command_ok(
-	[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
-	'restart succeeds with password-protected key file');
-$node->_update_pid(1);
+SKIP:
+{
+	skip "Certificate passphrases are checked on connection in NSS", 5
+	  if ($openssl);
+
+	switch_server_cert($node,
+		certfile => 'server-cn-only',
+		cafile => 'root+client_ca',
+		keyfile => 'server-password',
+		nssdatabase => 'server-cn-only.crt__server-password.key.db',
+		passphrase_cmd => 'echo wrongpassword');
+
+	command_ok(
+		[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
+		'restart fails with password-protected key file with wrong password');
+	$node->_update_pid(1);
+
+	test_connect_fails(
+		"user=ssltestuser dbname=trustdb sslcert=invalid hostaddr=$SERVERHOSTADDR host=common-name.pg-ssltest.test",
+		"sslrootcert=invalid sslmode=require",
+		qr/\QSSL error\E/,
+		"connect to server with incorrect key password configured");
+
+	switch_server_cert($node,
+		certfile => 'server-cn-only',
+		cafile => 'root+client_ca',
+		keyfile => 'server-password',
+		nssdatabase => 'server-cn-only.crt__server-password.key.db',
+		passphrase_cmd => 'echo secret1');
+
+	command_ok(
+		[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
+		'restart fails with password-protected key file with wrong password');
+	$node->_update_pid(1);
+
+	test_connect_ok(
+		"user=ssltestuser dbname=trustdb sslcert=invalid hostaddr=$SERVERHOSTADDR host=common-name.pg-ssltest.test",
+		"sslrootcert=invalid sslmode=require",
+		"connect to server with correct key password configured");
+}
 
 # Test compatibility of SSL protocols.
 # TLSv1.1 is lower than TLSv1.2, so it won't work.
@@ -91,7 +159,7 @@ command_ok(
 
 note "running client tests";
 
-switch_server_cert($node, 'server-cn-only');
+switch_server_cert($node, certfile => 'server-cn-only', nssdatabase => 'server-cn-only.crt__server-cn-only.key.db');
 
 $common_connstr =
   "user=ssltestuser dbname=trustdb sslcert=invalid hostaddr=$SERVERHOSTADDR host=common-name.pg-ssltest.test";
@@ -111,95 +179,118 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"sslrootcert=invalid sslmode=verify-ca",
-	qr/root certificate file "invalid" does not exist/,
+	qr/root certificate file "invalid" does not exist|Peer's certificate issuer has been marked as not trusted by the user/,
 	"connect without server root cert sslmode=verify-ca");
 test_connect_fails(
 	$common_connstr,
 	"sslrootcert=invalid sslmode=verify-full",
-	qr/root certificate file "invalid" does not exist/,
+	qr/root certificate file "invalid" does not exist|Peer's certificate issuer has been marked as not trusted by the user/,
 	"connect without server root cert sslmode=verify-full");
 
 # Try with wrong root cert, should fail. (We're using the client CA as the
 # root, but the server's key is signed by the server CA.)
-test_connect_fails($common_connstr,
-	"sslrootcert=ssl/client_ca.crt sslmode=require",
-	qr/SSL error/, "connect with wrong server root cert sslmode=require");
-test_connect_fails($common_connstr,
-	"sslrootcert=ssl/client_ca.crt sslmode=verify-ca",
-	qr/SSL error/, "connect with wrong server root cert sslmode=verify-ca");
-test_connect_fails($common_connstr,
-	"sslrootcert=ssl/client_ca.crt sslmode=verify-full",
-	qr/SSL error/, "connect with wrong server root cert sslmode=verify-full");
-
-# Try with just the server CA's cert. This fails because the root file
-# must contain the whole chain up to the root CA.
-test_connect_fails($common_connstr,
-	"sslrootcert=ssl/server_ca.crt sslmode=verify-ca",
-	qr/SSL error/, "connect with server CA cert, without root CA");
+test_connect_fails(
+	$common_connstr,
+	"sslrootcert=ssl/client_ca.crt sslmode=require cert_database=ssl/nss/client_ca.crt.db",
+	qr/SSL error/,
+	"connect with wrong server root cert sslmode=require");
+test_connect_fails(
+	$common_connstr,
+	"sslrootcert=ssl/client_ca.crt sslmode=verify-ca cert_database=ssl/nss/client_ca.crt.db",
+	qr/SSL error/,
+	"connect with wrong server root cert sslmode=verify-ca");
+test_connect_fails(
+	$common_connstr,
+	"sslrootcert=ssl/client_ca.crt sslmode=verify-full cert_database=ssl/nss/client_ca.crt.db",
+	qr/SSL error/,
+	"connect with wrong server root cert sslmode=verify-full");
+
+SKIP:
+{
+	# NSS supports partial chain validation, so this test doesn't work there.
+	# This is similar to the OpenSSL option X509_V_FLAG_PARTIAL_CHAIN which
+	# we don't allow.
+	skip "NSS support partial chain validation", 2 if ($nss);
+	# Try with just the server CA's cert. This fails because the root file
+	# must contain the whole chain up to the root CA.
+	test_connect_fails($common_connstr,
+		"sslrootcert=ssl/server_ca.crt sslmode=verify-ca",
+		qr/SSL error/, "connect with server CA cert, without root CA");
+}
 
 # And finally, with the correct root cert.
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require cert_database=ssl/nss/root+server_ca.crt.db",
 	"connect with correct server CA cert file sslmode=require");
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca cert_database=ssl/nss/root+server_ca.crt.db",
 	"connect with correct server CA cert file sslmode=verify-ca");
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-full",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db",
 	"connect with correct server CA cert file sslmode=verify-full");
 
-# Test with cert root file that contains two certificates. The client should
-# be able to pick the right one, regardless of the order in the file.
-test_connect_ok(
-	$common_connstr,
-	"sslrootcert=ssl/both-cas-1.crt sslmode=verify-ca",
-	"cert root file that contains two certificates, order 1");
-test_connect_ok(
-	$common_connstr,
-	"sslrootcert=ssl/both-cas-2.crt sslmode=verify-ca",
-	"cert root file that contains two certificates, order 2");
+SKIP:
+{
+	skip "CA ordering is irrelevant in NSS databases", 2 if ($nss);
 
+	# Test with cert root file that contains two certificates. The client should
+	# be able to pick the right one, regardless of the order in the file.
+	test_connect_ok(
+		$common_connstr,
+		"sslrootcert=ssl/both-cas-1.crt sslmode=verify-ca",
+		"cert root file that contains two certificates, order 1");
+
+	# How about import the both-file into a database?
+	test_connect_ok(
+		$common_connstr,
+		"sslrootcert=ssl/both-cas-2.crt sslmode=verify-ca",
+		"cert root file that contains two certificates, order 2");
+}
 # CRL tests
 
 # Invalid CRL filename is the same as no CRL, succeeds
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=invalid",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=invalid cert_database=ssl/nss/root+server_ca.crt.db",
 	"sslcrl option with invalid file name");
 
-# A CRL belonging to a different CA is not accepted, fails
-test_connect_fails(
-	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/client.crl",
-	qr/SSL error/,
-	"CRL belonging to a different CA");
+SKIP:
+{
+	skip "CRL's are verified when adding to NSS database", 4 if ($nss);
+	# A CRL belonging to a different CA is not accepted, fails
+	test_connect_fails(
+		$common_connstr,
+		"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/client.crl",
+		qr/SSL error/,
+		"CRL belonging to a different CA");
 
-# The same for CRL directory
-test_connect_fails(
-	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrldir=ssl/client-crldir",
-	qr/SSL error/,
-	"directory CRL belonging to a different CA");
+	# The same for CRL directory
+	test_connect_fails(
+		$common_connstr,
+		"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrldir=ssl/client-crldir",
+		qr/SSL error/,
+		"directory CRL belonging to a different CA");
+}
 
 # With the correct CRL, succeeds (this cert is not revoked)
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/root+server.crl",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/root+server.crl cert_database=ssl/nss/root+server_ca.crt__root+server.crl.db",
 	"CRL with a non-revoked cert");
 
 # The same for CRL directory
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrldir=ssl/root+server-crldir",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrldir=ssl/root+server-crldir cert_database=ssl/nss/root+server_ca.crt__root+server.crldir.db",
 	"directory CRL with a non-revoked cert");
 
 # Check that connecting with verify-full fails, when the hostname doesn't
 # match the hostname in the server's certificate.
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -212,14 +303,14 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"sslmode=verify-full host=wronghost.test",
-	qr/\Qserver certificate for "common-name.pg-ssltest.test" does not match host name "wronghost.test"\E/,
+	qr/\Qserver certificate for "common-name.pg-ssltest.test" does not match host name "wronghost.test"\E|requested domain name does not match the server's certificate/,
 	"mismatch between host name and server certificate sslmode=verify-full");
 
 # Test Subject Alternative Names.
-switch_server_cert($node, 'server-multiple-alt-names');
+switch_server_cert($node, certfile => 'server-multiple-alt-names', nssdatabase => 'server-multiple-alt-names.crt__server-multiple-alt-names.key.db');
 
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -237,20 +328,20 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"host=wronghost.alt-name.pg-ssltest.test",
-	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "wronghost.alt-name.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "wronghost.alt-name.pg-ssltest.test"\E|requested domain name does not match the server's certificate/,
 	"host name not matching with X.509 Subject Alternative Names");
 test_connect_fails(
 	$common_connstr,
 	"host=deep.subdomain.wildcard.pg-ssltest.test",
-	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E|requested domain name does not match the server's certificate/,
 	"host name not matching with X.509 Subject Alternative Names wildcard");
 
 # Test certificate with a single Subject Alternative Name. (this gives a
 # slightly different error message, that's all)
-switch_server_cert($node, 'server-single-alt-name');
+switch_server_cert($node, certfile => 'server-single-alt-name', nssdatabase => 'server-single-alt-name.crt__server-single-alt-name.key.db');
 
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -260,21 +351,21 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"host=wronghost.alt-name.pg-ssltest.test",
-	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "wronghost.alt-name.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "wronghost.alt-name.pg-ssltest.test"\E|requested domain name does not match the server's certificate/,
 	"host name not matching with a single X.509 Subject Alternative Name");
 test_connect_fails(
 	$common_connstr,
 	"host=deep.subdomain.wildcard.pg-ssltest.test",
-	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E|requested domain name does not match the server's certificate/,
 	"host name not matching with a single X.509 Subject Alternative Name wildcard"
 );
 
 # Test server certificate with a CN and SANs. Per RFCs 2818 and 6125, the CN
 # should be ignored when the certificate has both.
-switch_server_cert($node, 'server-cn-and-alt-names');
+switch_server_cert($node, certfile => 'server-cn-and-alt-names', nssdatabase => 'server-cn-and-alt-names.crt__server-cn-and-alt-names.key.db');
 
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -287,14 +378,14 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"host=common-name.pg-ssltest.test",
-	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 1 other name) does not match host name "common-name.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 1 other name) does not match host name "common-name.pg-ssltest.test"\E|requested domain name does not match the server's certificate/,
 	"certificate with both a CN and SANs ignores CN");
 
 # Finally, test a server certificate that has no CN or SANs. Of course, that's
 # not a very sensible certificate, but libpq should handle it gracefully.
-switch_server_cert($node, 'server-no-names');
+switch_server_cert($node, certfile => 'server-no-names', nssdatabase => 'server-no-names.crt__server-no-names.key.db');
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -303,11 +394,11 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"sslmode=verify-full host=common-name.pg-ssltest.test",
-	qr/could not get server's host name from server certificate/,
+	qr/could not get server's host name from server certificate|requested domain name does not match the server's certificate./,
 	"server certificate without CN or SANs sslmode=verify-full");
 
 # Test that the CRL works
-switch_server_cert($node, 'server-revoked');
+switch_server_cert($node, certfile => 'server-revoked', nssdatabase => 'server-revoked.crt__server-revoked.key.db');
 
 $common_connstr =
   "user=ssltestuser dbname=trustdb sslcert=invalid hostaddr=$SERVERHOSTADDR host=common-name.pg-ssltest.test";
@@ -315,16 +406,16 @@ $common_connstr =
 # Without the CRL, succeeds. With it, fails.
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca cert_database=ssl/nss/root+server_ca.crt.db",
 	"connects without client-side CRL");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/root+server.crl",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/server.crl cert_database=ssl/nss/root+server_ca.crt__server.crl.db",
 	qr/SSL error/,
 	"does not connect with client-side CRL file");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrldir=ssl/root+server-crldir",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrldir=ssl/root+server-crldir cert_database=ssl/nss/root+server_ca.crt__root+server.crldir.db",
 	qr/SSL error/,
 	"does not connect with client-side CRL directory");
 
@@ -345,32 +436,50 @@ command_like(
 # Test min/max SSL protocol versions.
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.2",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.2 cert_database=ssl/nss/root+server_ca.crt.db",
 	"connection success with correct range of TLS protocol versions");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.1",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.1 cert_database=ssl/nss/root+server_ca.crt.db",
 	qr/invalid SSL protocol version range/,
 	"connection failure with incorrect range of TLS protocol versions");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=incorrect_tls",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=incorrect_tls cert_database=ssl/nss/root+server_ca.crt.db",
 	qr/invalid ssl_min_protocol_version value/,
 	"connection failure with an incorrect SSL protocol minimum bound");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_max_protocol_version=incorrect_tls",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_max_protocol_version=incorrect_tls cert_database=ssl/nss/root+server_ca.crt.db",
 	qr/invalid ssl_max_protocol_version value/,
 	"connection failure with an incorrect SSL protocol maximum bound");
 
+# tests of NSS generated certificates/keys
+SKIP:
+{
+	skip "NSS specific tests",            1 if ($openssl);
+
+	switch_server_cert($node, certfile => 'native_server-root', cafile => 'native_ca-root', nssdatabase => 'native_server-root.db');
+	$common_connstr =
+	  "user=ssltestuser dbname=trustdb hostaddr=$SERVERHOSTADDR host=common-name.pg-ssltest.test";
+
+	test_connect_ok(
+		$common_connstr,
+		"sslmode=require user=ssltestuser",
+		"NSS generated certificates"
+	);
+}
+
 ### Server-side tests.
 ###
 ### Test certificate authorization.
 
+switch_server_cert($node, certfile => 'server-revoked', nssdatabase => 'server-revoked.crt__server-revoked.key.db');
+
 note "running server tests";
 
 $common_connstr =
-  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR";
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client.crt__client.key.db";
 
 # no client cert
 test_connect_fails(
@@ -386,32 +495,43 @@ test_connect_ok(
 	"certificate authorization succeeds with correct client cert in PEM format"
 );
 
-# correct client cert in unencrypted DER
-test_connect_ok(
-	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-der_tmp.key",
-	"certificate authorization succeeds with correct client cert in DER format"
-);
+$common_connstr =
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR";
+
+SKIP:
+{
+	skip "NSS database not implemented in the Makefile", 1 if ($nss);
+	# correct client cert in unencrypted DER
+	test_connect_ok(
+		$common_connstr,
+		"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-der_tmp.key",
+		"certificate authorization succeeds with correct client cert in DER format"
+	);
+}
 
 # correct client cert in encrypted PEM
 test_connect_ok(
 	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='dUmmyP^#+'",
+	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='dUmmyP^#+' cert_database=ssl/nss/client.crt__client-encrypted-pem.key.db",
 	"certificate authorization succeeds with correct client cert in encrypted PEM format"
 );
 
-# correct client cert in encrypted DER
-test_connect_ok(
-	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-der_tmp.key sslpassword='dUmmyP^#+'",
-	"certificate authorization succeeds with correct client cert in encrypted DER format"
-);
+SKIP:
+{
+	skip "NSS database not implemented in the Makefile", 1 if ($nss);
+	# correct client cert in encrypted DER
+	test_connect_ok(
+		$common_connstr,
+		"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-der_tmp.key sslpassword='dUmmyP^#+'",
+		"certificate authorization succeeds with correct client cert in encrypted DER format"
+	);
+}
 
 # correct client cert in encrypted PEM with wrong password
 test_connect_fails(
 	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='wrong'",
-	qr!\Qprivate key file "ssl/client-encrypted-pem_tmp.key": bad decrypt\E!,
+	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='wrong' cert_database=ssl/nss/client.crt__client-encrypted-pem.key.db",
+	qr!connection requires a valid client certificate|\Qprivate key file "ssl/client-encrypted-pem_tmp.key": bad decrypt\E!,
 	"certificate authorization fails with correct client cert and wrong password in encrypted PEM format"
 );
 
@@ -451,18 +571,19 @@ command_like(
 		'-P',
 		'null=_null_',
 		'-d',
-		"$common_connstr user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client_tmp.key",
+		"$common_connstr user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client_tmp.key cert_database=ssl/nss/client.crt__client.key.db",
 		'-c',
 		"SELECT * FROM pg_stat_ssl WHERE pid = pg_backend_pid()"
 	],
 	qr{^pid,ssl,version,cipher,bits,compression,client_dn,client_serial,issuer_dn\r?\n
-				^\d+,t,TLSv[\d.]+,[\w-]+,\d+,f,/CN=ssltestuser,1,\Q/CN=Test CA for PostgreSQL SSL regression test client certs\E\r?$}mx,
+				^\d+,t,TLSv[\d.]+,[\w-]+,\d+,f,/?CN=ssltestuser,1,/?\QCN=Test CA for PostgreSQL SSL regression test client certs\E\r?$}mx,
 	'pg_stat_ssl with client certificate');
 
 # client key with wrong permissions
 SKIP:
 {
 	skip "Permissions check not enforced on Windows", 2 if ($windows_os);
+	skip "Key not on filesystem with NSS",            2 if ($nss);
 
 	test_connect_fails(
 		$common_connstr,
@@ -475,10 +596,13 @@ SKIP:
 test_connect_fails(
 	$common_connstr,
 	"user=anotheruser sslcert=ssl/client.crt sslkey=ssl/client_tmp.key",
-	qr/certificate authentication failed for user "anotheruser"/,
+	qr/unable to verify certificate|certificate authentication failed for user "anotheruser"/,
 	"certificate authorization fails with client cert belonging to another user"
 );
 
+$common_connstr =
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client-revoked.crt__client-revoked.key.db";
+
 # revoked client cert
 test_connect_fails(
 	$common_connstr,
@@ -490,7 +614,7 @@ test_connect_fails(
 # works, iff username matches Common Name
 # fails, iff username doesn't match Common Name.
 $common_connstr =
-  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=verifydb hostaddr=$SERVERHOSTADDR";
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=verifydb hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client.crt__client.key.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -514,24 +638,28 @@ test_connect_ok(
 );
 
 # intermediate client_ca.crt is provided by client, and isn't in server's ssl_ca_file
-switch_server_cert($node, 'server-cn-only', 'root_ca');
+switch_server_cert($node, certfile => 'server-cn-only', cafile => 'root_ca', nssdatabase => 'server-cn-only.crt__server-cn-only.key.db');
 $common_connstr =
-  "user=ssltestuser dbname=certdb sslkey=ssl/client_tmp.key sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR";
+  "user=ssltestuser dbname=certdb sslkey=ssl/client_tmp.key sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client+client_ca.crt__client.key.db";
 
 test_connect_ok(
 	$common_connstr,
 	"sslmode=require sslcert=ssl/client+client_ca.crt",
 	"intermediate client certificate is provided by client");
-test_connect_fails($common_connstr, "sslmode=require sslcert=ssl/client.crt",
-	qr/SSL error/, "intermediate client certificate is missing");
+
+test_connect_fails(
+	$common_connstr,
+	"sslmode=require sslcert=ssl/client.crt",
+	qr/connection requires a valid client certificate|SSL error/,
+	"intermediate client certificate is missing");
 
 # test server-side CRL directory
-switch_server_cert($node, 'server-cn-only', undef, undef, 'root+client-crldir');
+switch_server_cert($node, certfile => 'server-cn-only', crldir => 'root+client-crldir', nssdatabase => 'server-cn-only.crt__server-cn-only.key.crldir.db');
 
 # revoked client cert
 test_connect_fails(
 	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client-revoked.crt sslkey=ssl/client-revoked_tmp.key",
+	"user=ssltestuser sslcert=ssl/client-revoked.crt sslkey=ssl/client-revoked_tmp.key cert_database=ssl/nss/client-revoked.crt__client-revoked.key.db",
 	qr/SSL error/,
 	"certificate authorization fails with revoked client cert with server-side CRL directory");
 
diff --git a/src/test/ssl/t/002_scram.pl b/src/test/ssl/t/002_scram.pl
index 3383b3e531..801c945e88 100644
--- a/src/test/ssl/t/002_scram.pl
+++ b/src/test/ssl/t/002_scram.pl
@@ -13,7 +13,26 @@ use lib $FindBin::RealBin;
 
 use SSL::Server;
 
-if ($ENV{with_ssl} ne 'openssl')
+my $openssl;
+my $nss;
+
+my $supports_tls_server_end_point;
+
+if ($ENV{with_ssl} eq 'openssl')
+{
+	$openssl = 1;
+	# Determine whether build supports tls-server-end-point.
+	$supports_tls_server_end_point =
+		check_pg_config("#define HAVE_X509_GET_SIGNATURE_NID 1");
+	plan tests => $supports_tls_server_end_point ? 9 : 10;
+}
+elsif ($ENV{with_ssl} eq 'nss')
+{
+	$nss = 1;
+	$supports_tls_server_end_point = 1;
+	plan tests => 9;
+}
+else
 {
 	plan skip_all => 'SSL not supported by this build';
 }
@@ -23,12 +42,6 @@ my $SERVERHOSTADDR = '127.0.0.1';
 # This is the pattern to use in pg_hba.conf to match incoming connections.
 my $SERVERHOSTCIDR = '127.0.0.1/32';
 
-# Determine whether build supports tls-server-end-point.
-my $supports_tls_server_end_point =
-  check_pg_config("#define HAVE_X509_GET_SIGNATURE_NID 1");
-
-my $number_of_tests = $supports_tls_server_end_point ? 9 : 10;
-
 # Allocation of base connection string shared among multiple tests.
 my $common_connstr;
 
@@ -47,7 +60,7 @@ $node->start;
 # Configure server for SSL connections, with password handling.
 configure_test_server_for_ssl($node, $SERVERHOSTADDR, $SERVERHOSTCIDR,
 	"scram-sha-256", "pass", "scram-sha-256");
-switch_server_cert($node, 'server-cn-only');
+switch_server_cert($node, certfile => 'server-cn-only', nssdatabase => 'server-cn-only.crt__server-cn-only.key.db');
 $ENV{PGPASSWORD} = "pass";
 $common_connstr =
   "dbname=trustdb sslmode=require sslcert=invalid sslrootcert=invalid hostaddr=$SERVERHOSTADDR";
@@ -97,7 +110,7 @@ my $client_tmp_key = "ssl/client_scram_tmp.key";
 copy("ssl/client.key", $client_tmp_key);
 chmod 0600, $client_tmp_key;
 test_connect_fails(
-	"sslcert=ssl/client.crt sslkey=$client_tmp_key sslrootcert=invalid hostaddr=$SERVERHOSTADDR",
+	"sslcert=ssl/client.crt sslkey=$client_tmp_key sslrootcert=invalid hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client.crt__client.key.db",
 	"dbname=certdb user=ssltestuser channel_binding=require",
 	qr/channel binding required, but server authenticated client without channel binding/,
 	"Cert authentication and channel_binding=require");
diff --git a/src/test/ssl/t/SSL/Backend/NSS.pm b/src/test/ssl/t/SSL/Backend/NSS.pm
new file mode 100644
index 0000000000..20633fe41b
--- /dev/null
+++ b/src/test/ssl/t/SSL/Backend/NSS.pm
@@ -0,0 +1,61 @@
+package SSL::Backend::NSS;
+
+use strict;
+use warnings;
+use Exporter;
+
+our @ISA       = qw(Exporter);
+our @EXPORT_OK = qw(get_new_nss_backend);
+
+sub new
+{
+	my ($class) = @_;
+
+	my $self = { _library => 'NSS' };
+
+	bless $self, $class;
+
+	return $self;
+}
+
+sub get_new_nss_backend
+{
+	my $class = 'SSL::Backend::NSS';
+
+	return $class->new();
+}
+
+sub init
+{
+	# Make sure the certificate databases are in place?
+}
+
+sub get_library
+{
+	my ($self) = @_;
+
+	return $self->{_library};
+}
+
+sub set_server_cert
+{
+	my $self   = $_[0];
+	my $params = $_[1];
+
+	$params->{cafile} = 'root+client_ca' unless defined $params->{cafile};
+
+	my $sslconf =
+	    "ssl_ca_file='$params->{cafile}.crt'\n"
+	  . "ssl_cert_file='ssl/$params->{certfile}.crt'\n"
+	  . "ssl_crl_file=''\n"
+	  . "ssl_database='nss/$params->{nssdatabase}'\n";
+
+	return $sslconf;
+}
+
+sub cleanup
+{
+	# Something?
+}
+
+1;
diff --git a/src/test/ssl/t/SSL/Backend/OpenSSL.pm b/src/test/ssl/t/SSL/Backend/OpenSSL.pm
index 62b11b7632..ecceaefe57 100644
--- a/src/test/ssl/t/SSL/Backend/OpenSSL.pm
+++ b/src/test/ssl/t/SSL/Backend/OpenSSL.pm
@@ -71,18 +71,19 @@ sub init
 # the server so that the configuration takes effect.
 sub set_server_cert
 {
-	my $self     = $_[0];
-	my $certfile = $_[1];
-	my $cafile   = $_[2] || "root+client_ca";
-	my $keyfile  = $_[3] || $certfile;
+	my $self   = $_[0];
+	my $params = $_[1];
 
-	my $sslconf =
-	    "ssl_ca_file='$cafile.crt'\n"
-	  . "ssl_cert_file='$certfile.crt'\n"
-	  . "ssl_key_file='$keyfile.key'\n"
-	  . "ssl_crl_file='root+client.crl'\n";
+	$params->{cafile} = 'root+client_ca' unless defined $params->{cafile};
+	$params->{crlfile} = 'root+client.crl' unless defined $params->{crlfile};
+	$params->{keyfile} = $params->{certfile} unless defined $params->{keyfile};
 
-	return $sslconf;
+	my $sslconf =
+	    "ssl_ca_file='$params->{cafile}.crt'\n"
+	  . "ssl_cert_file='$params->{certfile}.crt'\n"
+	  . "ssl_key_file='$params->{keyfile}.key'\n"
+	  . "ssl_crl_file='$params->{crlfile}'\n";
+	$sslconf .= "ssl_crl_dir='$params->{crldir}'\n" if defined $params->{crldir};
 }
 
 sub get_library
diff --git a/src/test/ssl/t/SSL/Server.pm b/src/test/ssl/t/SSL/Server.pm
index e59554f85b..da90b2c1d3 100644
--- a/src/test/ssl/t/SSL/Server.pm
+++ b/src/test/ssl/t/SSL/Server.pm
@@ -55,7 +55,6 @@ elsif ($ENV{with_ssl} eq 'nss')
 use Exporter 'import';
 our @EXPORT = qw(
   configure_test_server_for_ssl
-  set_server_cert
   switch_server_cert
   test_connect_fails
   test_connect_ok
@@ -202,46 +201,21 @@ sub cleanup
 	$backend->cleanup();
 }
 
-# Change the configuration to use given server cert file,
-sub set_server_cert
+# Change the configuration to use the given set of certificate, key, ca and
+# CRL, and potentially reload the server so that the configuration takes effect.
+sub switch_server_cert
 {
-	my $node     = $_[0];
-	my $certfile = $_[1];
-	my $cafile   = $_[2] || "root+client_ca";
-	my $keyfile  = $_[3] || '';
-	my $pwcmd    = $_[4] || '';
-	my $crlfile  = "root+client.crl";
-	my $crldir;
-	my $pgdata   = $node->data_dir;
-
-	$keyfile = $certfile if $keyfile eq '';
-
-	# defaults to use crl file
-	if (defined $_[3] || defined $_[4])
-	{
-		$crlfile = $_[3];
-		$crldir = $_[4];
-	}
+	my $node   = shift;
+	my %params = @_;
+	my $pgdata = $node->data_dir;
 
 	open my $sslconf, '>', "$pgdata/sslconfig.conf";
 	print $sslconf "ssl=on\n";
-	print $sslconf $backend->set_server_cert($certfile, $cafile, $keyfile);
-	print $sslconf "ssl_crl_file='$crlfile'\n" if defined $crlfile;
-	print $sslconf "ssl_crl_dir='$crldir'\n" if defined $crldir;
-	print $sslconf "ssl_passphrase_command='$pwcmd'\n"
-	  unless $pwcmd eq '';
+	print $sslconf $backend->set_server_cert(\%params);
+	print $sslconf "ssl_passphrase_command='" . $params{passphrase_cmd} . "'\n"
+	  if defined $params{passphrase_cmd};
 	close $sslconf;
-	return;
-}
 
-# Change the configuration to use given server cert file, and reload
-# the server so that the configuration takes effect.
-# Takes the same arguments as set_server_cert, which it calls to do that
-# piece of the work.
-sub switch_server_cert
-{
-	my $node = $_[0];
-	set_server_cert(@_);
 	$node->restart;
 	return;
 }
-- 
2.21.1 (Apple Git-122.3)

From da2520aec462b80609c318b6c196bcc24a61bf57 Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Mon, 8 Feb 2021 23:52:34 +0100
Subject: [PATCH v28 2/9] Refactor SSL testharness for multiple library

The SSL testharness was fully tied to OpenSSL in the way the server was
set up and reconfigured. This refactors the SSLServer module into a SSL
library agnostic SSL/Server module which in turn use SSL/Backend/<lib>
modules for the implementation details.

No changes are done to the actual tests, this only change how setup and
teardown is performed.
---
 src/test/ssl/t/001_ssltests.pl                |  56 ++--------
 src/test/ssl/t/002_scram.pl                   |   6 +-
 src/test/ssl/t/SSL/Backend/OpenSSL.pm         | 103 ++++++++++++++++++
 .../ssl/t/{SSLServer.pm => SSL/Server.pm}     |  83 +++++++++++---
 4 files changed, 181 insertions(+), 67 deletions(-)
 create mode 100644 src/test/ssl/t/SSL/Backend/OpenSSL.pm
 rename src/test/ssl/t/{SSLServer.pm => SSL/Server.pm} (78%)

diff --git a/src/test/ssl/t/001_ssltests.pl b/src/test/ssl/t/001_ssltests.pl
index 864f6e209f..30b68bddbe 100644
--- a/src/test/ssl/t/001_ssltests.pl
+++ b/src/test/ssl/t/001_ssltests.pl
@@ -4,12 +4,10 @@ use PostgresNode;
 use TestLib;
 use Test::More;
 
-use File::Copy;
-
 use FindBin;
 use lib $FindBin::RealBin;
 
-use SSLServer;
+use SSL::Server;
 
 if ($ENV{with_ssl} ne 'openssl')
 {
@@ -32,32 +30,6 @@ my $SERVERHOSTCIDR = '127.0.0.1/32';
 # Allocation of base connection string shared among multiple tests.
 my $common_connstr;
 
-# The client's private key must not be world-readable, so take a copy
-# of the key stored in the code tree and update its permissions.
-#
-# This changes ssl/client.key to ssl/client_tmp.key etc for the rest
-# of the tests.
-my @keys = (
-	"client",     "client-revoked",
-	"client-der", "client-encrypted-pem",
-	"client-encrypted-der");
-foreach my $key (@keys)
-{
-	copy("ssl/${key}.key", "ssl/${key}_tmp.key")
-	  or die
-	  "couldn't copy ssl/${key}.key to ssl/${key}_tmp.key for permissions change: $!";
-	chmod 0600, "ssl/${key}_tmp.key"
-	  or die "failed to change permissions on ssl/${key}_tmp.key: $!";
-}
-
-# Also make a copy of that explicitly world-readable.  We can't
-# necessarily rely on the file in the source tree having those
-# permissions.  Add it to @keys to include it in the final clean
-# up phase.
-copy("ssl/client.key", "ssl/client_wrongperms_tmp.key");
-chmod 0644, "ssl/client_wrongperms_tmp.key";
-push @keys, 'client_wrongperms';
-
 #### Set up the server.
 
 note "setting up data directory";
@@ -72,32 +44,22 @@ $node->start;
 
 # Run this before we lock down access below.
 my $result = $node->safe_psql('postgres', "SHOW ssl_library");
-is($result, 'OpenSSL', 'ssl_library parameter');
+is($result, SSL::Server::ssl_library(), 'ssl_library parameter');
 
 configure_test_server_for_ssl($node, $SERVERHOSTADDR, $SERVERHOSTCIDR,
 	'trust');
 
 note "testing password-protected keys";
 
-open my $sslconf, '>', $node->data_dir . "/sslconfig.conf";
-print $sslconf "ssl=on\n";
-print $sslconf "ssl_cert_file='server-cn-only.crt'\n";
-print $sslconf "ssl_key_file='server-password.key'\n";
-print $sslconf "ssl_passphrase_command='echo wrongpassword'\n";
-close $sslconf;
-
+set_server_cert($node, 'server-cn-only', 'root+client_ca',
+				   'server-password', 'echo wrongpassword');
 command_fails(
 	[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
 	'restart fails with password-protected key file with wrong password');
 $node->_update_pid(0);
 
-open $sslconf, '>', $node->data_dir . "/sslconfig.conf";
-print $sslconf "ssl=on\n";
-print $sslconf "ssl_cert_file='server-cn-only.crt'\n";
-print $sslconf "ssl_key_file='server-password.key'\n";
-print $sslconf "ssl_passphrase_command='echo secret1'\n";
-close $sslconf;
-
+set_server_cert($node, 'server-cn-only', 'root+client_ca',
+				'server-password', 'echo secret1');
 command_ok(
 	[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
 	'restart succeeds with password-protected key file');
@@ -574,7 +536,5 @@ test_connect_fails(
 	"certificate authorization fails with revoked client cert with server-side CRL directory");
 
 # clean up
-foreach my $key (@keys)
-{
-	unlink("ssl/${key}_tmp.key");
-}
+
+SSL::Server::cleanup();
diff --git a/src/test/ssl/t/002_scram.pl b/src/test/ssl/t/002_scram.pl
index 410b9e910d..3383b3e531 100644
--- a/src/test/ssl/t/002_scram.pl
+++ b/src/test/ssl/t/002_scram.pl
@@ -11,11 +11,11 @@ use File::Copy;
 use FindBin;
 use lib $FindBin::RealBin;
 
-use SSLServer;
+use SSL::Server;
 
 if ($ENV{with_ssl} ne 'openssl')
 {
-	plan skip_all => 'OpenSSL not supported by this build';
+	plan skip_all => 'SSL not supported by this build';
 }
 
 # This is the hostname used to connect to the server.
@@ -104,5 +104,3 @@ test_connect_fails(
 
 # clean up
 unlink($client_tmp_key);
-
-done_testing($number_of_tests);
diff --git a/src/test/ssl/t/SSL/Backend/OpenSSL.pm b/src/test/ssl/t/SSL/Backend/OpenSSL.pm
new file mode 100644
index 0000000000..62b11b7632
--- /dev/null
+++ b/src/test/ssl/t/SSL/Backend/OpenSSL.pm
@@ -0,0 +1,103 @@
+package SSL::Backend::OpenSSL;
+
+use strict;
+use warnings;
+use Exporter;
+use File::Copy;
+
+our @ISA       = qw(Exporter);
+our @EXPORT_OK = qw(get_new_openssl_backend);
+
+our (@keys);
+
+INIT
+{
+	@keys = (
+		"client",     "client-revoked",
+		"client-der", "client-encrypted-pem",
+		"client-encrypted-der");
+}
+
+sub new
+{
+	my ($class) = @_;
+
+	my $self = { _library => 'OpenSSL' };
+
+	bless $self, $class;
+
+	return $self;
+}
+
+sub get_new_openssl_backend
+{
+	my $class = 'SSL::Backend::OpenSSL';
+
+	my $backend = $class->new();
+
+	return $backend;
+}
+
+sub init
+{
+	# The client's private key must not be world-readable, so take a copy
+	# of the key stored in the code tree and update its permissions.
+	#
+	# This changes ssl/client.key to ssl/client_tmp.key etc for the rest
+	# of the tests.
+	foreach my $key (@keys)
+	{
+		copy("ssl/${key}.key", "ssl/${key}_tmp.key")
+		  or die
+		  "couldn't copy ssl/${key}.key to ssl/${key}_tmp.key for permissions change: $!";
+		chmod 0600, "ssl/${key}_tmp.key"
+		  or die "failed to change permissions on ssl/${key}_tmp.key: $!";
+	}
+
+	# Also make a copy of that explicitly world-readable.  We can't
+	# necessarily rely on the file in the source tree having those
+	# permissions. Add it to @keys to include it in the final clean
+	# up phase.
+	copy("ssl/client.key", "ssl/client_wrongperms_tmp.key")
+	  or die
+	  "couldn't copy ssl/client.key to ssl/client_wrongperms_tmp.key: $!";
+	chmod 0644, "ssl/client_wrongperms_tmp.key"
+	  or die
+	  "failed to change permissions on ssl/client_wrongperms_tmp.key: $!";
+	push @keys, 'client_wrongperms';
+}
+
+# Change the configuration to use given server cert file, and reload
+# the server so that the configuration takes effect.
+sub set_server_cert
+{
+	my $self     = $_[0];
+	my $certfile = $_[1];
+	my $cafile   = $_[2] || "root+client_ca";
+	my $keyfile  = $_[3] || $certfile;
+
+	my $sslconf =
+	    "ssl_ca_file='$cafile.crt'\n"
+	  . "ssl_cert_file='$certfile.crt'\n"
+	  . "ssl_key_file='$keyfile.key'\n"
+	  . "ssl_crl_file='root+client.crl'\n";
+
+	return $sslconf;
+}
+
+sub get_library
+{
+	my ($self) = @_;
+
+	return $self->{_library};
+}
+
+sub cleanup
+{
+	foreach my $key (@keys)
+	{
+		unlink("ssl/${key}_tmp.key");
+	}
+}
+
+1;
diff --git a/src/test/ssl/t/SSLServer.pm b/src/test/ssl/t/SSL/Server.pm
similarity index 78%
rename from src/test/ssl/t/SSLServer.pm
rename to src/test/ssl/t/SSL/Server.pm
index 5ec5e0dac8..e59554f85b 100644
--- a/src/test/ssl/t/SSLServer.pm
+++ b/src/test/ssl/t/SSL/Server.pm
@@ -23,19 +23,39 @@
 # explicitly because an invalid sslcert or sslrootcert, respectively,
 # causes those to be ignored.)
 
-package SSLServer;
+package SSL::Server;
 
 use strict;
 use warnings;
 use PostgresNode;
+use RecursiveCopy;
 use TestLib;
 use File::Basename;
 use File::Copy;
 use Test::More;
+use SSL::Backend::OpenSSL qw(get_new_openssl_backend);
+use SSL::Backend::NSS qw(get_new_nss_backend);
+
+our ($openssl, $nss, $backend);
+
+# The TLS backend which the server is using should be mostly transparent for
+# the user, apart from individual configuration settings, so keep the backend
+# specific things abstracted behind SSL::Server.
+if ($ENV{with_ssl} eq 'openssl')
+{
+	$backend = get_new_openssl_backend();
+	$openssl = 1;
+}
+elsif ($ENV{with_ssl} eq 'nss')
+{
+	$backend = get_new_nss_backend();
+	$nss     = 1;
+}
 
 use Exporter 'import';
 our @EXPORT = qw(
   configure_test_server_for_ssl
+  set_server_cert
   switch_server_cert
   test_connect_fails
   test_connect_ok
@@ -144,14 +164,21 @@ sub configure_test_server_for_ssl
 	close $sslconf;
 
 	# Copy all server certificates and keys, and client root cert, to the data dir
-	copy_files("ssl/server-*.crt", $pgdata);
-	copy_files("ssl/server-*.key", $pgdata);
-	chmod(0600, glob "$pgdata/server-*.key") or die $!;
-	copy_files("ssl/root+client_ca.crt", $pgdata);
-	copy_files("ssl/root_ca.crt",        $pgdata);
-	copy_files("ssl/root+client.crl",    $pgdata);
-	mkdir("$pgdata/root+client-crldir");
-	copy_files("ssl/root+client-crldir/*", "$pgdata/root+client-crldir/");
+	if (defined($openssl))
+	{
+		copy_files("ssl/server-*.crt", $pgdata);
+		copy_files("ssl/server-*.key", $pgdata);
+		chmod(0600, glob "$pgdata/server-*.key") or die $!;
+		copy_files("ssl/root+client_ca.crt", $pgdata);
+		copy_files("ssl/root_ca.crt",        $pgdata);
+		copy_files("ssl/root+client.crl",    $pgdata);
+		mkdir("$pgdata/root+client-crldir");
+		copy_files("ssl/root+client-crldir/*", "$pgdata/root+client-crldir/");
+	}
+	elsif (defined($nss))
+	{
+		RecursiveCopy::copypath("ssl/nss", $pgdata . "/nss") if -e "ssl/nss";
+	}
 
 	# Stop and restart server to load new listen_addresses.
 	$node->restart;
@@ -159,20 +186,36 @@ sub configure_test_server_for_ssl
 	# Change pg_hba after restart because hostssl requires ssl=on
 	configure_hba_for_ssl($node, $servercidr, $authmethod);
 
+	# Finally, perform backend specific configuration
+	$backend->init();
+
 	return;
 }
 
-# Change the configuration to use given server cert file, and reload
-# the server so that the configuration takes effect.
-sub switch_server_cert
+sub ssl_library
+{
+	return $backend->get_library();
+}
+
+sub cleanup
+{
+	$backend->cleanup();
+}
+
+# Change the configuration to use given server cert file,
+sub set_server_cert
 {
 	my $node     = $_[0];
 	my $certfile = $_[1];
 	my $cafile   = $_[2] || "root+client_ca";
+	my $keyfile  = $_[3] || '';
+	my $pwcmd    = $_[4] || '';
 	my $crlfile  = "root+client.crl";
 	my $crldir;
 	my $pgdata   = $node->data_dir;
 
+	$keyfile = $certfile if $keyfile eq '';
+
 	# defaults to use crl file
 	if (defined $_[3] || defined $_[4])
 	{
@@ -182,13 +225,23 @@ sub switch_server_cert
 
 	open my $sslconf, '>', "$pgdata/sslconfig.conf";
 	print $sslconf "ssl=on\n";
-	print $sslconf "ssl_ca_file='$cafile.crt'\n";
-	print $sslconf "ssl_cert_file='$certfile.crt'\n";
-	print $sslconf "ssl_key_file='$certfile.key'\n";
+	print $sslconf $backend->set_server_cert($certfile, $cafile, $keyfile);
 	print $sslconf "ssl_crl_file='$crlfile'\n" if defined $crlfile;
 	print $sslconf "ssl_crl_dir='$crldir'\n" if defined $crldir;
+	print $sslconf "ssl_passphrase_command='$pwcmd'\n"
+	  unless $pwcmd eq '';
 	close $sslconf;
+	return;
+}
 
+# Change the configuration to use given server cert file, and reload
+# the server so that the configuration takes effect.
+# Takes the same arguments as set_server_cert, which it calls to do that
+# piece of the work.
+sub switch_server_cert
+{
+	my $node = $_[0];
+	set_server_cert(@_);
 	$node->restart;
 	return;
 }
-- 
2.21.1 (Apple Git-122.3)

From 6d6179180f41746c65ab139e4cf0e85fc5fb84bc Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Mon, 8 Feb 2021 23:52:22 +0100
Subject: [PATCH v28 1/9] nss: Support libnss as TLS library in libpq

This commit contains the frontend and backend portion of TLS support
in libpq to allow encrypted connections. The implementation is done
as a drop-in replacement for the OpenSSL support and leverages the
same internal API for abstracting library specific details.

A new GUC, ssl_database, is used to identify the NSS database used for
the serverside certificates and keys. The existing certificate and key
GUCs are used for providing certificate and key nicknames.

Client side there is a new connection parameter, cert_database, to
identify the client cert and key. All existing sslmodes are supported
in the same way as with OpenSSL.

Authors: Daniel Gustafsson, Andrew Dunstan, Jacob Champion
Reviewed-by: Michael Paquier
---
 .../postgres_fdw/expected/postgres_fdw.out    |    2 +-
 src/backend/libpq/auth.c                      |    7 +
 src/backend/libpq/be-secure-nss.c             | 1388 +++++++++++++++++
 src/backend/libpq/be-secure.c                 |    3 +
 src/backend/utils/misc/guc.c                  |   20 +-
 src/common/cipher_nss.c                       |  192 +++
 src/include/common/nss.h                      |   49 +
 src/include/libpq/libpq-be.h                  |   10 +-
 src/include/libpq/libpq.h                     |    3 +
 src/include/pg_config_manual.h                |    2 +-
 src/interfaces/libpq/fe-connect.c             |    4 +
 src/interfaces/libpq/fe-secure-nss.c          | 1088 +++++++++++++
 src/interfaces/libpq/fe-secure.c              |   21 +
 src/interfaces/libpq/libpq-fe.h               |   11 +
 src/interfaces/libpq/libpq-int.h              |   25 +-
 15 files changed, 2820 insertions(+), 5 deletions(-)
 create mode 100644 src/backend/libpq/be-secure-nss.c
 create mode 100644 src/common/cipher_nss.c
 create mode 100644 src/include/common/nss.h
 create mode 100644 src/interfaces/libpq/fe-secure-nss.c

diff --git a/contrib/postgres_fdw/expected/postgres_fdw.out b/contrib/postgres_fdw/expected/postgres_fdw.out
index 0649b6b81c..3d51a7c9b8 100644
--- a/contrib/postgres_fdw/expected/postgres_fdw.out
+++ b/contrib/postgres_fdw/expected/postgres_fdw.out
@@ -8946,7 +8946,7 @@ DO $d$
     END;
 $d$;
 ERROR:  invalid option "password"
-HINT:  Valid options in this context are: service, passfile, channel_binding, connect_timeout, dbname, host, hostaddr, port, options, application_name, keepalives, keepalives_idle, keepalives_interval, keepalives_count, tcp_user_timeout, sslmode, sslcompression, sslcert, sslkey, sslrootcert, sslcrl, sslcrldir, requirepeer, ssl_min_protocol_version, ssl_max_protocol_version, gssencmode, krbsrvname, gsslib, target_session_attrs, use_remote_estimate, fdw_startup_cost, fdw_tuple_cost, extensions, updatable, fetch_size, batch_size
+HINT:  Valid options in this context are: service, passfile, channel_binding, connect_timeout, dbname, host, hostaddr, port, options, application_name, keepalives, keepalives_idle, keepalives_interval, keepalives_count, tcp_user_timeout, sslmode, sslcompression, sslcert, sslkey, sslrootcert, sslcrl, sslcrldir, requirepeer, ssl_min_protocol_version, ssl_max_protocol_version, gssencmode, krbsrvname, gsslib, target_session_attrs, cert_database, use_remote_estimate, fdw_startup_cost, fdw_tuple_cost, extensions, updatable, fetch_size, batch_size
 CONTEXT:  SQL statement "ALTER SERVER loopback_nopw OPTIONS (ADD password 'dummypw')"
 PL/pgSQL function inline_code_block line 3 at EXECUTE
 -- If we add a password for our user mapping instead, we should get a different
diff --git a/src/backend/libpq/auth.c b/src/backend/libpq/auth.c
index 545635f41a..09ad2ad063 100644
--- a/src/backend/libpq/auth.c
+++ b/src/backend/libpq/auth.c
@@ -2849,7 +2849,14 @@ CheckCertAuth(Port *port)
 {
 	int			status_check_usermap = STATUS_ERROR;
 
+#if defined(USE_OPENSSL)
 	Assert(port->ssl);
+#elif defined(USE_NSS)
+	/* TODO: should we rename pr_fd to ssl, to keep consistency? */
+	Assert(port->pr_fd);
+#else
+	Assert(false);
+#endif
 
 	/* Make sure we have received a username in the certificate */
 	if (port->peer_cn == NULL ||
diff --git a/src/backend/libpq/be-secure-nss.c b/src/backend/libpq/be-secure-nss.c
new file mode 100644
index 0000000000..a17e6c7e5d
--- /dev/null
+++ b/src/backend/libpq/be-secure-nss.c
@@ -0,0 +1,1388 @@
+/*-------------------------------------------------------------------------
+ *
+ * be-secure-nss.c
+ *	  functions for supporting NSS as a TLS backend
+ *
+ *
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ *	  src/backend/libpq/be-secure-nss.c
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#include "postgres.h"
+
+#include <sys/stat.h>
+
+#include "common/nss.h"
+
+/*
+ * The nspr/obsolete/protypes.h NSPR header typedefs uint64 and int64 with
+ * colliding definitions from ours, causing a much expected compiler error.
+ * Remove backwards compatibility with ancient NSPR versions to avoid this.
+ */
+#define NO_NSPR_10_SUPPORT
+#include <nspr/nspr.h>
+#include <nspr/prerror.h>
+#include <nspr/prio.h>
+#include <nspr/prmem.h>
+#include <nspr/prtypes.h>
+
+#include <nss/nss.h>
+#include <nss/base64.h>
+#include <nss/cert.h>
+#include <nss/certdb.h>
+#include <nss/hasht.h>
+#include <nss/keyhi.h>
+#include <nss/pk11pub.h>
+#include <nss/secder.h>
+#include <nss/secerr.h>
+#include <nss/secitem.h>
+#include <nss/secoidt.h>
+#include <nss/secport.h>
+#include <nss/ssl.h>
+#include <nss/sslerr.h>
+#include <nss/sslproto.h>
+
+#include "lib/stringinfo.h"
+#include "libpq/libpq.h"
+#include "nodes/pg_list.h"
+#include "miscadmin.h"
+#include "storage/fd.h"
+#include "utils/guc.h"
+#include "utils/memutils.h"
+
+
+/* default init hook can be overridden by a shared library */
+static void default_nss_tls_init(bool isServerStart);
+nss_tls_init_hook_type nss_tls_init_hook = default_nss_tls_init;
+
+static PRDescIdentity pr_id;
+
+static PRIOMethods pr_iomethods;
+static NSSInitContext *nss_context = NULL;
+static SSLVersionRange desired_sslver;
+
+static char *external_ssl_passphrase_cb(PK11SlotInfo *slot, PRBool retry, void *arg);
+static SECStatus pg_SSLShutdownFunc(void *private_data, void *nss_data);
+static bool dummy_ssl_passwd_cb_called = false;
+static bool ssl_is_server_start;
+
+/*
+ * PR_ImportTCPSocket() is a private API, but very widely used, as it's the
+ * only way to make NSS use an already set up POSIX file descriptor rather
+ * than opening one itself. To quote the NSS documentation:
+ *
+ *		"In theory, code that uses PR_ImportTCPSocket may break when NSPR's
+ *		implementation changes. In practice, this is unlikely to happen because
+ *		NSPR's implementation has been stable for years and because of NSPR's
+ *		strong commitment to backward compatibility."
+ *
+ * https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSPR/Reference/PR_ImportTCPSocket
+ *
+ * The function is declared in <private/pprio.h>, but as it is a header marked
+ * private we declare it here rather than including it.
+ */
+NSPR_API(PRFileDesc *) PR_ImportTCPSocket(int);
+
+/* NSS IO layer callback overrides */
+static PRInt32 pg_ssl_read(PRFileDesc *fd, void *buf, PRInt32 amount,
+						   PRIntn flags, PRIntervalTime timeout);
+static PRInt32 pg_ssl_write(PRFileDesc *fd, const void *buf, PRInt32 amount,
+							PRIntn flags, PRIntervalTime timeout);
+static PRStatus pg_ssl_close(PRFileDesc *fd);
+/* Utility functions */
+static PRFileDesc *init_iolayer(Port *port);
+static uint16 ssl_protocol_version_to_nss(int v, const char *guc_name);
+
+static char *pg_SSLerrmessage(PRErrorCode errcode);
+static char *ssl_protocol_version_to_string(int v);
+static SECStatus pg_cert_auth_handler(void *arg, PRFileDesc *fd,
+									  PRBool checksig, PRBool isServer);
+static SECStatus pg_bad_cert_handler(void *arg, PRFileDesc *fd);
+static char *dummy_ssl_passphrase_cb(PK11SlotInfo *slot, PRBool retry, void *arg);
+
+/* ------------------------------------------------------------ */
+/*						 Public interface						*/
+/* ------------------------------------------------------------ */
+
+/*
+ * be_tls_init
+ *			Initialize the nss TLS library in the postmaster
+ *
+ * The majority of the setup needs to happen in be_tls_open_server since the
+ * NSPR initialization must happen after the forking of the backend. We could
+ * potentially move some parts in under !isServerStart, but so far this is the
+ * separation chosen.
+ */
+int
+be_tls_init(bool isServerStart)
+{
+	SECStatus	status;
+	SSLVersionRange supported_sslver;
+
+	status = SSL_ConfigServerSessionIDCacheWithOpt(0, 0, NULL, 1, 0, 0, PR_FALSE);
+	if (status != SECSuccess)
+	{
+		ereport(isServerStart ? FATAL : LOG,
+				(errmsg("unable to connect to TLS connection cache: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+		return -1;
+	}
+
+	if (!ssl_database || strlen(ssl_database) == 0)
+	{
+		ereport(isServerStart ? FATAL : LOG,
+				(errmsg("no certificate database specified")));
+		return -1;
+	}
+
+	/*
+	 * We check for the desired TLS version range here, even though we cannot
+	 * set it until be_open_server such that we can be compatible with how the
+	 * OpenSSL backend reports errors for incompatible range configurations.
+	 * Set either the default supported TLS version range, or the configured
+	 * range from ssl_min_protocol_version and ssl_max_protocol version. In
+	 * case the user hasn't defined the maximum allowed version we fall back
+	 * to the highest version TLS that the library supports.
+	 */
+	if (SSL_VersionRangeGetSupported(ssl_variant_stream, &supported_sslver) != SECSuccess)
+	{
+		ereport(isServerStart ? FATAL : LOG,
+				(errmsg("unable to get default protocol support from NSS")));
+		return -1;
+	}
+
+	/*
+	 * Set the fallback versions for the TLS protocol version range to a
+	 * combination of our minimal requirement and the library maximum. Error
+	 * messages should be kept identical to those in be-secure-openssl.c to
+	 * make translations easier.
+	 */
+	desired_sslver.min = SSL_LIBRARY_VERSION_TLS_1_0;
+	desired_sslver.max = supported_sslver.max;
+
+	if (ssl_min_protocol_version)
+	{
+		int			ver = ssl_protocol_version_to_nss(ssl_min_protocol_version,
+													  "ssl_min_protocol_version");
+
+		if (ver == -1)
+		{
+			ereport(isServerStart ? FATAL : LOG,
+					(errmsg("\"%s\" setting \"%s\" not supported by this build",
+							"ssl_min_protocol_version",
+							GetConfigOption("ssl_min_protocol_version",
+											false, false))));
+			return -1;
+		}
+
+		if (ver > 0)
+			desired_sslver.min = ver;
+	}
+
+	if (ssl_max_protocol_version)
+	{
+		int			ver = ssl_protocol_version_to_nss(ssl_max_protocol_version,
+													  "ssl_max_protocol_version");
+
+		if (ver == -1)
+		{
+			ereport(isServerStart ? FATAL : LOG,
+					(errmsg("\"%s\" setting \"%s\" not supported by this build",
+							"ssl_max_protocol_version",
+							GetConfigOption("ssl_max_protocol_version",
+											false, false))));
+			return -1;
+		}
+		if (ver > 0)
+			desired_sslver.max = ver;
+
+		if (ver < desired_sslver.min)
+		{
+			ereport(isServerStart ? FATAL : LOG,
+					(errmsg("could not set SSL protocol version range"),
+					 errdetail("\"%s\" cannot be higher than \"%s\"",
+							   "ssl_min_protocol_version",
+							   "ssl_max_protocol_version")));
+			return -1;
+		}
+	}
+
+	/*
+	 * Set the passphrase callback which will be used both to obtain the
+	 * passphrase from the user, as well as by NSS to obtain the phrase
+	 * repeatedly.
+	 */
+	ssl_is_server_start = isServerStart;
+	(*nss_tls_init_hook) (isServerStart);
+
+	return 0;
+}
+
+int
+be_tls_open_server(Port *port)
+{
+	SECStatus	status;
+	PRFileDesc *model;
+	PRFileDesc *pr_fd;
+	PRFileDesc *layer;
+	CERTCertificate *server_cert;
+	SECKEYPrivateKey *private_key;
+	CERTSignedCrl *crl;
+	SECItem		crlname;
+	char	   *cert_database;
+	NSSInitParameters params;
+
+	/*
+	 * The NSPR documentation states that runtime initialization via PR_Init
+	 * is no longer required, as the first caller into NSPR will perform the
+	 * initialization implicitly. The documentation doesn't however clarify
+	 * from which version this is holds true, so let's perform the potentially
+	 * superfluous initialization anyways to avoid crashing on older versions
+	 * of NSPR, as there is no difference in overhead.  The NSS documentation
+	 * still states that PR_Init must be called in some way (implicitly or
+	 * explicitly).
+	 *
+	 * The below parameters are what the implicit initialization would've done
+	 * for us, and should work even for older versions where it might not be
+	 * done automatically. The last parameter, maxPTDs, is set to various
+	 * values in other codebases, but has been unused since NSPR 2.1 which was
+	 * released sometime in 1998. In current versions of NSPR all parameters
+	 * are ignored.
+	 */
+	PR_Init(PR_USER_THREAD, PR_PRIORITY_NORMAL, 0 /* maxPTDs */ );
+
+	/*
+	 * The certificate path (configdir) must contain a valid NSS database. If
+	 * the certificate path isn't a valid directory, NSS will fall back on the
+	 * system certificate database. If the certificate path is a directory but
+	 * is empty then the initialization will fail. On the client side this can
+	 * be allowed for any sslmode but the verify-xxx ones.
+	 * https://bugzilla.redhat.com/show_bug.cgi?id=728562 For the server side
+	 * we won't allow this to fail however, as we require the certificate and
+	 * key to exist.
+	 *
+	 * The original design of NSS was for a single application to use a single
+	 * copy of it, initialized with NSS_Initialize() which isn't returning any
+	 * handle with which to refer to NSS. NSS initialization and shutdown are
+	 * global for the application, so a shutdown in another NSS enabled
+	 * library would cause NSS to be stopped for libpq as well.  The fix has
+	 * been to introduce NSS_InitContext which returns a context handle to
+	 * pass to NSS_ShutdownContext.  NSS_InitContext was introduced in NSS
+	 * 3.12, but the use of it is not very well documented.
+	 * https://bugzilla.redhat.com/show_bug.cgi?id=738456
+	 *
+	 * The InitParameters struct passed can be used to override internal
+	 * values in NSS, but the usage is not documented at all. When using
+	 * NSS_Init initializations, the values are instead set via PK11_Configure
+	 * calls so the PK11_Configure documentation can be used to glean some
+	 * details on these.
+	 *
+	 * https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS/PKCS11/Module_Specs
+	 */
+	memset(&params, '\0', sizeof(params));
+	params.length = sizeof(params);
+
+	if (!ssl_database || strlen(ssl_database) == 0)
+		ereport(FATAL,
+				(errmsg("no certificate database specified")));
+
+	cert_database = psprintf("sql:%s", ssl_database);
+	nss_context = NSS_InitContext(cert_database, "", "", "",
+								  &params,
+								  NSS_INIT_READONLY | NSS_INIT_PK11RELOAD);
+	pfree(cert_database);
+
+	if (!nss_context)
+		ereport(FATAL,
+				(errmsg("unable to read certificate database \"%s\": %s",
+						ssl_database, pg_SSLerrmessage(PR_GetError()))));
+
+	/*
+	 * Import the already opened socket as we don't want to use NSPR functions
+	 * for opening the network socket due to how the PostgreSQL protocol works
+	 * with TLS connections. This function is not part of the NSPR public API,
+	 * see the comment at the top of the file for the rationale of still using
+	 * it.
+	 */
+	pr_fd = PR_ImportTCPSocket(port->sock);
+	if (!pr_fd)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to connect to socket")));
+		return -1;
+	}
+
+	/*
+	 * Most of the documentation available, and implementations of, NSS/NSPR
+	 * use the PR_NewTCPSocket() function here, which has the drawback that it
+	 * can only create IPv4 sockets. Instead use PR_OpenTCPSocket() which
+	 * copes with IPv6 as well.
+	 *
+	 * We use a model filedescriptor here which is a construct in NSPR/NSS in
+	 * order to create a configuration template for sockets which can then be
+	 * applied to new sockets created. This makes more sense in a server which
+	 * accepts multiple connections and want to perform the boilerplate just
+	 * once, but it does provide a nice abstraction here as well in that we
+	 * can error out early without having performed any operation on the real
+	 * socket.
+	 */
+	model = PR_OpenTCPSocket(port->laddr.addr.ss_family);
+	if (!model)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to open socket")));
+		return -1;
+	}
+
+	/*
+	 * Convert the NSPR socket to an SSL socket. Ensuring the success of this
+	 * operation is critical as NSS SSL_* functions may return SECSuccess on
+	 * the socket even though SSL hasn't been enabled, which introduce a risk
+	 * of silent downgrades.
+	 */
+	model = SSL_ImportFD(NULL, model);
+	if (!model)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to enable TLS on socket")));
+		return -1;
+	}
+
+	/*
+	 * Configure basic settings for the connection over the SSL socket in
+	 * order to set it up as a server.
+	 */
+	if (SSL_OptionSet(model, SSL_SECURITY, PR_TRUE) != SECSuccess)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to configure TLS connection")));
+		return -1;
+	}
+
+	if (SSL_OptionSet(model, SSL_HANDSHAKE_AS_SERVER, PR_TRUE) != SECSuccess ||
+		SSL_OptionSet(model, SSL_HANDSHAKE_AS_CLIENT, PR_FALSE) != SECSuccess)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to configure TLS connection as server")));
+		return -1;
+	}
+
+	/*
+	 * SSLv2 is disabled by default, and SSLv3 will be excluded from the range
+	 * of allowed protocols further down. Since we really don't want these to
+	 * ever be enabled, let's use belts and suspenders and explicitly turn
+	 * them off as well.
+	 */
+	SSL_OptionSet(model, SSL_ENABLE_SSL2, PR_FALSE);
+	SSL_OptionSet(model, SSL_ENABLE_SSL3, PR_FALSE);
+
+#ifdef SSL_CBC_RANDOM_IV
+
+	/*
+	 * Enable protection against the BEAST attack in case the NSS server has
+	 * support for that. While SSLv3 is disabled, we may still allow TLSv1
+	 * which is affected. The option isn't documented as an SSL option, but as
+	 * an NSS environment variable.
+	 */
+	SSL_OptionSet(model, SSL_CBC_RANDOM_IV, PR_TRUE);
+#endif
+
+	/*
+	 * Configure the allowed ciphers. If there are no user preferred suites,
+	 * set the domestic policy.
+	 *
+	 * Historically there were different cipher policies based on export (and
+	 * import) restrictions: Domestic, Export and France. These are since long
+	 * removed with all ciphers being enabled by default. Due to backwards
+	 * compatibility, the old API is still used even though all three policies
+	 * now do the same thing.
+	 *
+	 * If SSLCipherSuites define a policy of the user, we set that rather than
+	 * enabling all ciphers via NSS_SetDomesticPolicy.
+	 *
+	 * TODO: while this code works, the set of ciphers which can be set and
+	 * still end up with a working socket is woefully underdocumented for
+	 * anything more recent than SSLv3 (the code for TLS actually calls ssl3
+	 * functions under the hood for SSL_CipherPrefSet), so it's unclear if
+	 * this is helpful or not. Using the policies works, but may be too
+	 * coarsely grained.
+	 *
+	 * Another TODO: The SSL_ImplementedCiphers table returned with calling
+	 * SSL_GetImplementedCiphers is sorted in server preference order. Sorting
+	 * SSLCipherSuites according to the order of the ciphers therein could be
+	 * a way to implement ssl_prefer_server_ciphers - if we at all want to use
+	 * cipher selection for NSS like how we do it for OpenSSL that is.
+	 */
+
+	/*
+	 * If no ciphers are specified, enable them all.
+	 */
+	if (!SSLCipherSuites || strlen(SSLCipherSuites) == 0)
+	{
+		status = NSS_SetDomesticPolicy();
+		if (status != SECSuccess)
+		{
+			ereport(COMMERROR,
+					(errmsg("unable to set cipher policy: %s",
+							pg_SSLerrmessage(PR_GetError()))));
+			return -1;
+		}
+	}
+	else
+	{
+		char	   *ciphers,
+				   *c;
+
+		char	   *sep = ":;, ";
+		PRUint16	ciphercode;
+		const		PRUint16 *nss_ciphers;
+
+		/*
+		 * If the user has specified a set of preferred cipher suites we start
+		 * by turning off all the existing suites to avoid the risk of down-
+		 * grades to a weaker cipher than expected.
+		 */
+		nss_ciphers = SSL_GetImplementedCiphers();
+		for (int i = 0; i < SSL_GetNumImplementedCiphers(); i++)
+			SSL_CipherPrefSet(model, nss_ciphers[i], PR_FALSE);
+
+		ciphers = pstrdup(SSLCipherSuites);
+
+		for (c = strtok(ciphers, sep); c; c = strtok(NULL, sep))
+		{
+			if (!pg_find_cipher(c, &ciphercode))
+			{
+				status = SSL_CipherPrefSet(model, ciphercode, PR_TRUE);
+				if (status != SECSuccess)
+				{
+					ereport(COMMERROR,
+							(errmsg("invalid cipher-suite specified: %s", c)));
+					return -1;
+				}
+			}
+		}
+
+		pfree(ciphers);
+	}
+
+	if (SSL_VersionRangeSet(model, &desired_sslver) != SECSuccess)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to set requested SSL protocol version range")));
+		return -1;
+	}
+
+	/*
+	 * Set up the custom IO layer.
+	 */
+	layer = init_iolayer(port);
+	if (!layer)
+		return -1;
+
+	if (PR_PushIOLayer(pr_fd, PR_TOP_IO_LAYER, layer) != PR_SUCCESS)
+	{
+		PR_Close(layer);
+		ereport(COMMERROR,
+				(errmsg("unable to push IO layer")));
+		return -1;
+	}
+
+	server_cert = PK11_FindCertFromNickname(ssl_cert_file, (void *) port);
+	if (!server_cert)
+	{
+		if (dummy_ssl_passwd_cb_called)
+		{
+			ereport(COMMERROR,
+					(errmsg("unable to load certificate for \"%s\": %s",
+							ssl_cert_file, pg_SSLerrmessage(PR_GetError())),
+					 errhint("The certificate requires a password.")));
+			return -1;
+		}
+		else
+		{
+			ereport(COMMERROR,
+					(errmsg("unable to find certificate for \"%s\": %s",
+							ssl_cert_file, pg_SSLerrmessage(PR_GetError()))));
+			return -1;
+		}
+	}
+
+	private_key = PK11_FindKeyByAnyCert(server_cert, (void *) port);
+	if (!private_key)
+	{
+		if (dummy_ssl_passwd_cb_called)
+		{
+			ereport(COMMERROR,
+					(errmsg("unable to load private key for \"%s\": %s",
+							ssl_cert_file, pg_SSLerrmessage(PR_GetError())),
+					 errhint("The private key requires a password.")));
+			return -1;
+		}
+		else
+		{
+			ereport(COMMERROR,
+					(errmsg("unable to find private key for \"%s\": %s",
+							ssl_cert_file, pg_SSLerrmessage(PR_GetError()))));
+			return -1;
+		}
+	}
+
+	/*
+	 * NSS doesn't use CRL files on disk, so we use the ssl_crl_file guc to
+	 * contain the CRL nickname for the current server certificate in the NSS
+	 * certificate database. The main difference from the OpenSSL backend is
+	 * that NSS will use the CRL regardless, but being able to make sure the
+	 * CRL is loaded seems like a good feature.
+	 */
+	if (ssl_crl_file[0])
+	{
+		SECITEM_CopyItem(NULL, &crlname, &server_cert->derSubject);
+		crl = SEC_FindCrlByName(CERT_GetDefaultCertDB(), &crlname, SEC_CRL_TYPE);
+		if (!crl)
+		{
+			ereport(COMMERROR,
+					(errmsg("specified CRL not found in database")));
+			return -1;
+		}
+		SEC_DestroyCrl(crl);
+	}
+
+	/*
+	 * Finally we must configure the socket for being a server by setting the
+	 * certificate and key. The NULL parameter is an SSLExtraServerCertData
+	 * pointer with the final parameter being the size of the extra server
+	 * cert data structure pointed to. This is typically only used for
+	 * credential delegation.
+	 */
+	status = SSL_ConfigServerCert(model, server_cert, private_key, NULL, 0);
+	if (status != SECSuccess)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to configure server for TLS server connections: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+		return -1;
+	}
+
+	ssl_loaded_verify_locations = true;
+
+	/*
+	 * At this point, we no longer have use for the certificate and private
+	 * key as they have been copied into the context by NSS. Destroy our
+	 * copies explicitly to clean out the memory as best we can.
+	 */
+	CERT_DestroyCertificate(server_cert);
+	SECKEY_DestroyPrivateKey(private_key);
+
+	/* Set up certificate authentication callback */
+	status = SSL_AuthCertificateHook(model, pg_cert_auth_handler, (void *) port);
+	if (status != SECSuccess)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to install authcert hook: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+		return -1;
+	}
+	SSL_BadCertHook(model, pg_bad_cert_handler, (void *) port);
+	SSL_OptionSet(model, SSL_REQUEST_CERTIFICATE, PR_TRUE);
+	SSL_OptionSet(model, SSL_REQUIRE_CERTIFICATE, PR_FALSE);
+
+	port->pr_fd = SSL_ImportFD(model, pr_fd);
+	if (!port->pr_fd)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to initialize")));
+		return -1;
+	}
+
+	PR_Close(model);
+
+	/*
+	 * Force a handshake on the next I/O request, the second parameter means
+	 * that we are a server, PR_FALSE would indicate being a client. NSPR
+	 * requires us to call SSL_ResetHandshake since we imported an already
+	 * established socket.
+	 */
+	status = SSL_ResetHandshake(port->pr_fd, PR_TRUE);
+	if (status != SECSuccess)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to initiate handshake: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+		return -1;
+	}
+	status = SSL_ForceHandshake(port->pr_fd);
+	if (status != SECSuccess)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to handshake: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+		return -1;
+	}
+
+	port->ssl_in_use = true;
+
+	/* Register out shutdown callback */
+	NSS_RegisterShutdown(pg_SSLShutdownFunc, port);
+
+	return 0;
+}
+
+ssize_t
+be_tls_read(Port *port, void *ptr, size_t len, int *waitfor)
+{
+	ssize_t		n_read;
+	PRErrorCode err;
+
+	n_read = PR_Read(port->pr_fd, ptr, len);
+
+	if (n_read < 0)
+	{
+		err = PR_GetError();
+
+		if (err == PR_WOULD_BLOCK_ERROR)
+		{
+			*waitfor = WL_SOCKET_READABLE;
+			errno = EWOULDBLOCK;
+		}
+		else
+			errno = ECONNRESET;
+	}
+
+	return n_read;
+}
+
+ssize_t
+be_tls_write(Port *port, void *ptr, size_t len, int *waitfor)
+{
+	ssize_t		n_write;
+	PRErrorCode err;
+	PRIntn		flags = 0;
+
+	/*
+	 * The flags parameter to PR_Send is no longer used and is, according to
+	 * the documentation, required to be zero.
+	 */
+	n_write = PR_Send(port->pr_fd, ptr, len, flags, PR_INTERVAL_NO_WAIT);
+
+	if (n_write < 0)
+	{
+		err = PR_GetError();
+
+		if (err == PR_WOULD_BLOCK_ERROR)
+		{
+			*waitfor = WL_SOCKET_WRITEABLE;
+			errno = EWOULDBLOCK;
+		}
+		else
+			errno = ECONNRESET;
+	}
+
+	return n_write;
+}
+
+void
+be_tls_close(Port *port)
+{
+	if (!port)
+		return;
+
+	if (port->peer_cn)
+	{
+		SSL_InvalidateSession(port->pr_fd);
+		pfree(port->peer_cn);
+		port->peer_cn = NULL;
+	}
+
+	PR_Close(port->pr_fd);
+	port->pr_fd = NULL;
+	port->ssl_in_use = false;
+
+	if (nss_context)
+	{
+		NSS_ShutdownContext(nss_context);
+		nss_context = NULL;
+	}
+}
+
+void
+be_tls_destroy(void)
+{
+	/*
+	 * It reads a bit odd to clear a session cache when we are destroying the
+	 * context altogether, but if the session cache isn't cleared before
+	 * shutting down the context it will fail with SEC_ERROR_BUSY.
+	 */
+	SSL_ClearSessionCache();
+}
+
+int
+be_tls_get_cipher_bits(Port *port)
+{
+	SECStatus	status;
+	SSLChannelInfo channel;
+	SSLCipherSuiteInfo suite;
+
+	status = SSL_GetChannelInfo(port->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+		goto error;
+
+	status = SSL_GetCipherSuiteInfo(channel.cipherSuite, &suite, sizeof(suite));
+	if (status != SECSuccess)
+		goto error;
+
+	return suite.effectiveKeyBits;
+
+error:
+	ereport(WARNING,
+			(errmsg("unable to extract TLS session information: %s",
+					pg_SSLerrmessage(PR_GetError()))));
+	return 0;
+}
+
+/*
+ * be_tls_get_compression
+ *
+ * NSS disabled support for TLS compression in version 3.33 and removed the
+ * code in a subsequent release. The API for retrieving information about
+ * compression as well as enabling it is kept for backwards compatibility, but
+ * we don't need to consult it since it was only available for SSLv3 which we
+ * don't support.
+ *
+ * https://bugzilla.mozilla.org/show_bug.cgi?id=1409587
+ */
+bool
+be_tls_get_compression(Port *port)
+{
+	return false;
+}
+
+/*
+ * be_tls_get_version
+ *
+ * Returns the protocol version used for the current connection, or NULL in
+ * case of errors.
+ */
+const char *
+be_tls_get_version(Port *port)
+{
+	SECStatus	status;
+	SSLChannelInfo channel;
+
+	status = SSL_GetChannelInfo(port->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+	{
+		ereport(WARNING,
+				(errmsg("unable to extract TLS session information: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+		return NULL;
+	}
+
+	return ssl_protocol_version_to_string(channel.protocolVersion);
+}
+
+const char *
+be_tls_get_cipher(Port *port)
+{
+	SECStatus	status;
+	SSLChannelInfo channel;
+	SSLCipherSuiteInfo suite;
+
+	status = SSL_GetChannelInfo(port->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+		goto error;
+
+	status = SSL_GetCipherSuiteInfo(channel.cipherSuite, &suite, sizeof(suite));
+	if (status != SECSuccess)
+		goto error;
+
+	return suite.cipherSuiteName;
+
+error:
+	ereport(WARNING,
+			(errmsg("unable to extract TLS session information: %s",
+					pg_SSLerrmessage(PR_GetError()))));
+	return NULL;
+}
+
+void
+be_tls_get_peer_subject_name(Port *port, char *ptr, size_t len)
+{
+	CERTCertificate *certificate;
+
+	certificate = SSL_PeerCertificate(port->pr_fd);
+	if (certificate)
+		strlcpy(ptr, CERT_NameToAscii(&certificate->subject), len);
+	else
+		ptr[0] = '\0';
+}
+
+void
+be_tls_get_peer_issuer_name(Port *port, char *ptr, size_t len)
+{
+	CERTCertificate *certificate;
+
+	certificate = SSL_PeerCertificate(port->pr_fd);
+	if (certificate)
+		strlcpy(ptr, CERT_NameToAscii(&certificate->issuer), len);
+	else
+		ptr[0] = '\0';
+}
+
+void
+be_tls_get_peer_serial(Port *port, char *ptr, size_t len)
+{
+	CERTCertificate *certificate;
+
+	certificate = SSL_PeerCertificate(port->pr_fd);
+	if (certificate)
+		snprintf(ptr, len, "%li", DER_GetInteger(&(certificate->serialNumber)));
+	else
+		ptr[0] = '\0';
+}
+
+char *
+be_tls_get_certificate_hash(Port *port, size_t *len)
+{
+	CERTCertificate *certificate;
+	SECOidTag	signature_tag;
+	SECOidTag	digest_alg;
+	int			digest_len;
+	SECStatus	status;
+	PLArenaPool *arena = NULL;
+	SECItem		digest;
+	char	   *ret;
+	PK11Context *ctx = NULL;
+	unsigned int outlen;
+
+	*len = 0;
+	certificate = SSL_LocalCertificate(port->pr_fd);
+	if (!certificate)
+		return NULL;
+
+	signature_tag = SECOID_GetAlgorithmTag(&certificate->signature);
+	if (!pg_find_signature_algorithm(signature_tag, &digest_alg, &digest_len))
+		elog(ERROR, "could not find digest for OID '%s'",
+			 SECOID_FindOIDTagDescription(signature_tag));
+
+	/*
+	 * The TLS server's certificate bytes need to be hashed with SHA-256 if
+	 * its signature algorithm is MD5 or SHA-1 as per RFC 5929
+	 * (https://tools.ietf.org/html/rfc5929#section-4.1).  If something else
+	 * is used, the same hash as the signature algorithm is used.
+	 */
+	if (digest_alg == SEC_OID_SHA1 || digest_alg == SEC_OID_MD5)
+	{
+		digest_alg = SEC_OID_SHA256;
+		digest_len = SHA256_LENGTH;
+	}
+
+	ctx = PK11_CreateDigestContext(digest_alg);
+	if (!ctx)
+		elog(ERROR, "out of memory");
+
+	arena = PORT_NewArena(SEC_ASN1_DEFAULT_ARENA_SIZE);
+	digest.data = PORT_ArenaZAlloc(arena, sizeof(unsigned char) * digest_len);
+	digest.len = digest_len;
+
+	status = SECSuccess;
+	status |= PK11_DigestBegin(ctx);
+	status |= PK11_DigestOp(ctx, certificate->derCert.data, certificate->derCert.len);
+	status |= PK11_DigestFinal(ctx, digest.data, &outlen, digest_len);
+
+	if (status != SECSuccess)
+	{
+		PORT_FreeArena(arena, PR_TRUE);
+		PK11_DestroyContext(ctx, PR_TRUE);
+		elog(ERROR, "could not generate server certificate hash");
+	}
+
+	ret = palloc(digest.len);
+	memcpy(ret, digest.data, digest.len);
+	*len = digest_len;
+
+	PORT_FreeArena(arena, PR_TRUE);
+	PK11_DestroyContext(ctx, PR_TRUE);
+
+	return ret;
+}
+
+/* ------------------------------------------------------------ */
+/*						Internal functions						*/
+/* ------------------------------------------------------------ */
+
+/*
+ * default_nss_tls_init
+ *
+ * The default TLS init hook function which users can override for installing
+ * their own passphrase callbacks and similar actions. In case no callback has
+ * been configured, or the callback isn't reload capable during a server
+ * reload, the dummy callback will be installed.
+ *
+ * The private data for the callback is set differently depending on how it's
+ * invoked. For calls which may invoke the callback deeper in the callstack
+ * the private data is set with SSL_SetPKCS11PinArg. When the call is directly
+ * invoking the callback, like PK11_FindCertFromNickname, then the private
+ * data is passed as a parameter. Setting the data with SSL_SetPKCS11PinArg is
+ * thus not required but good practice.
+ *
+ * NSS doesn't provide a default callback like OpenSSL does, but a callback is
+ * required to be set.  The password callback can be installed at any time, but
+ * setting the private data with SSL_SetPKCS11PinArg requires a PR Filedesc.
+ */
+static void
+default_nss_tls_init(bool isServerStart)
+{
+	/*
+	 * No user-defined callback has been configured, install the dummy call-
+	 * back since we must set something.
+	 */
+	if (!ssl_passphrase_command[0])
+		PK11_SetPasswordFunc(dummy_ssl_passphrase_cb);
+	else
+	{
+		/*
+		 * There is a user-defined callback, set it unless we are in a restart
+		 * and cannot handle restarts due to an interactive callback.
+		 */
+		if (isServerStart)
+			PK11_SetPasswordFunc(external_ssl_passphrase_cb);
+		else
+		{
+			if (ssl_passphrase_command_supports_reload)
+				PK11_SetPasswordFunc(external_ssl_passphrase_cb);
+			else
+				PK11_SetPasswordFunc(dummy_ssl_passphrase_cb);
+		}
+	}
+}
+
+/*
+ * external_ssl_passphrase_cb
+ *
+ * Runs the callback configured by ssl_passphrase_command and returns the
+ * captured password back to NSS.
+ */
+static char *
+external_ssl_passphrase_cb(PK11SlotInfo *slot, PRBool retry, void *arg)
+{
+	/*
+	 * NSS use a hardcoded 256 byte buffer for reading the password so set the
+	 * same limit for our callback buffer.
+	 */
+	char		buf[256];
+	int			len;
+	char	   *password = NULL;
+	char	   *prompt;
+
+	/*
+	 * Since there is no password callback in NSS when the server starts up,
+	 * it makes little sense to create an interactive callback. Thus, if this
+	 * is a retry attempt then give up immediately.
+	 */
+	if (retry)
+		return NULL;
+
+	/*
+	 * Construct the same prompt that NSS uses internally even though it is
+	 * unlikely to serve much purpose, but we must set a prompt so we might as
+	 * well do it right.
+	 */
+	prompt = psprintf("Enter Password or Pin for \"%s\":",
+					  PK11_GetTokenName(slot));
+
+	len = run_ssl_passphrase_command(prompt, ssl_is_server_start, buf, sizeof(buf));
+	pfree(prompt);
+
+	if (!len)
+		return NULL;
+
+	/*
+	 * At least one byte with password content was returned, and NSS requires
+	 * that we return it allocated in NSS controlled memory. If we fail to
+	 * allocate then abort without passing back NULL and bubble up the error
+	 * on the PG side.
+	 */
+	password = (char *) PR_Malloc(len + 1);
+	if (!password)
+	{
+		explicit_bzero(buf, sizeof(buf));
+		ereport(ERROR,
+				(errcode(ERRCODE_OUT_OF_MEMORY),
+				 errmsg("out of memory")));
+	}
+	strlcpy(password, buf, sizeof(password));
+	explicit_bzero(buf, sizeof(buf));
+
+	return password;
+}
+
+/*
+ * dummy_ssl_passphrase_cb
+ *
+ * Return unsuccessful if we are asked to provide the passphrase for a cert or
+ * key, without having a passphrase callback installed.
+ */
+static char *
+dummy_ssl_passphrase_cb(PK11SlotInfo *slot, PRBool retry, void *arg)
+{
+	dummy_ssl_passwd_cb_called = true;
+	return NULL;
+}
+
+static SECStatus
+pg_bad_cert_handler(void *arg, PRFileDesc *fd)
+{
+	Port	   *port = (Port *) arg;
+
+	port->peer_cert_valid = false;
+	return SECFailure;
+}
+
+/*
+ * raw_subject_common_name
+ *
+ * Returns the Subject Common Name for the given certificate as a raw char
+ * buffer (that is, without any form of escaping for unprintable characters or
+ * embedded nulls), with the length of the buffer returned in the len param.
+ * The buffer is allocated in the TopMemoryContext and is given a NULL
+ * terminator so that callers are safe to call strlen() on it.
+ *
+ * This is used instead of CERT_GetCommonName(), which always performs quoting
+ * and/or escaping. NSS doesn't appear to give us a way to easily unescape the
+ * result, and we need to store the raw CN into port->peer_cn for compatibility
+ * with the OpenSSL implementation.
+ */
+static char *
+raw_subject_common_name(CERTCertificate *cert, unsigned int *len)
+{
+	CERTName	subject = cert->subject;
+	CERTRDN	  **rdn;
+
+	for (rdn = subject.rdns; *rdn; rdn++)
+	{
+		CERTAVA	  **ava;
+
+		for (ava = (*rdn)->avas; *ava; ava++)
+		{
+			SECItem	   *buf;
+			char	   *cn;
+
+			if (CERT_GetAVATag(*ava) != SEC_OID_AVA_COMMON_NAME)
+				continue;
+
+			/* Found a CN, ecode and copy it into a newly allocated buffer */
+			buf = CERT_DecodeAVAValue(&(*ava)->value);
+			if (!buf)
+			{
+				/*
+				 * This failure case is difficult to test. (Since this code
+				 * runs after certificate authentication has otherwise
+				 * succeeded, you'd need to convince a CA implementation to
+				 * sign a corrupted certificate in order to get here.)
+				 *
+				 * Follow the behavior of CERT_GetCommonName() in this case and
+				 * simply return NULL, as if a Common Name had not been found.
+				 */
+				goto fail;
+			}
+
+			cn = MemoryContextAlloc(TopMemoryContext, buf->len + 1);
+			memcpy(cn, buf->data, buf->len);
+			cn[buf->len] = '\0';
+
+			*len = buf->len;
+
+			SECITEM_FreeItem(buf, PR_TRUE);
+			return cn;
+		}
+	}
+
+fail:
+	/* Not found. */
+	*len = 0;
+	return NULL;
+}
+
+/*
+ * pg_cert_auth_handler
+ *
+ * Callback for validation of incoming certificates. Returning SECFailure will
+ * cause NSS to terminate the connection immediately.
+ */
+static SECStatus
+pg_cert_auth_handler(void *arg, PRFileDesc *fd, PRBool checksig, PRBool isServer)
+{
+	SECStatus	status;
+	Port	   *port = (Port *) arg;
+	CERTCertificate *cert;
+	char	   *peer_cn;
+	unsigned int len;
+
+	status = SSL_AuthCertificate(CERT_GetDefaultCertDB(), port->pr_fd, checksig, PR_TRUE);
+	if (status != SECSuccess)
+		return status;
+
+	port->peer_cn = NULL;
+	port->peer_cert_valid = false;
+
+	cert = SSL_PeerCertificate(port->pr_fd);
+	if (!cert)
+	{
+		/* Shouldn't be possible; why did we get a client cert callback? */
+		Assert(cert != NULL);
+
+		PR_SetError(SEC_ERROR_LIBRARY_FAILURE, 0);
+		return SECFailure;
+	}
+
+	peer_cn = raw_subject_common_name(cert, &len);
+	if (!peer_cn)
+	{
+		/* No Common Name, but the certificate otherwise checks out. */
+		port->peer_cert_valid = true;
+
+		status = SECSuccess;
+		goto cleanup;
+	}
+
+	/*
+	 * Reject embedded NULLs in certificate common name to prevent attacks like
+	 * CVE-2009-4034.
+	 */
+	if (len != strlen(peer_cn))
+	{
+		ereport(COMMERROR,
+				(errcode(ERRCODE_PROTOCOL_VIOLATION),
+				 errmsg("SSL certificate's common name contains embedded null")));
+
+		pfree(peer_cn);
+		PR_SetError(SEC_ERROR_CERT_NOT_VALID, 0);
+
+		status = SECFailure;
+		goto cleanup;
+	}
+
+	port->peer_cn = peer_cn;
+	port->peer_cert_valid = true;
+
+	status = SECSuccess;
+
+cleanup:
+	CERT_DestroyCertificate(cert);
+	return status;
+}
+
+static PRInt32
+pg_ssl_read(PRFileDesc *fd, void *buf, PRInt32 amount, PRIntn flags,
+			PRIntervalTime timeout)
+{
+	PRRecvFN	read_fn;
+	PRInt32		n_read;
+
+	read_fn = fd->lower->methods->recv;
+	n_read = read_fn(fd->lower, buf, amount, flags, timeout);
+
+	return n_read;
+}
+
+static PRInt32
+pg_ssl_write(PRFileDesc *fd, const void *buf, PRInt32 amount, PRIntn flags,
+			 PRIntervalTime timeout)
+{
+	PRSendFN	send_fn;
+	PRInt32		n_write;
+
+	send_fn = fd->lower->methods->send;
+	n_write = send_fn(fd->lower, buf, amount, flags, timeout);
+
+	return n_write;
+}
+
+static PRStatus
+pg_ssl_close(PRFileDesc *fd)
+{
+	/*
+	 * Disconnect our private Port from the fd before closing out the stack.
+	 * (Debug builds of NSPR will assert if we do not.)
+	 */
+	fd->secret = NULL;
+	return PR_GetDefaultIOMethods()->close(fd);
+}
+
+static PRFileDesc *
+init_iolayer(Port *port)
+{
+	const		PRIOMethods *default_methods;
+	PRFileDesc *layer;
+
+	/*
+	 * Start by initializing our layer with all the default methods so that we
+	 * can selectively override the ones we want while still ensuring that we
+	 * have a complete layer specification.
+	 */
+	default_methods = PR_GetDefaultIOMethods();
+	memcpy(&pr_iomethods, default_methods, sizeof(PRIOMethods));
+
+	pr_iomethods.recv = pg_ssl_read;
+	pr_iomethods.send = pg_ssl_write;
+	pr_iomethods.close = pg_ssl_close;
+
+	/*
+	 * Each IO layer must be identified by a unique name, where uniqueness is
+	 * per connection. Each connection in a postgres cluster can generate the
+	 * identity from the same string as they will create their IO layers on
+	 * different sockets. Only one layer per socket can have the same name.
+	 */
+	pr_id = PR_GetUniqueIdentity("PostgreSQL Server");
+	if (pr_id == PR_INVALID_IO_LAYER)
+	{
+		ereport(ERROR,
+				(errmsg("out of memory when setting up TLS connection")));
+		return NULL;
+	}
+
+	/*
+	 * Create the actual IO layer as a stub such that it can be pushed onto
+	 * the layer stack. The step via a stub is required as we define custom
+	 * callbacks.
+	 */
+	layer = PR_CreateIOLayerStub(pr_id, &pr_iomethods);
+	if (!layer)
+	{
+		ereport(ERROR,
+				(errmsg("unable to create NSS I/O layer")));
+		return NULL;
+	}
+
+	/* Store the Port as private data available in callbacks */
+	layer->secret = (void *) port;
+
+	return layer;
+}
+
+static char *
+ssl_protocol_version_to_string(int v)
+{
+	switch (v)
+	{
+			/* SSL v2 and v3 are not supported */
+		case SSL_LIBRARY_VERSION_2:
+		case SSL_LIBRARY_VERSION_3_0:
+			Assert(false);
+			break;
+
+		case SSL_LIBRARY_VERSION_TLS_1_0:
+			return pstrdup("TLSv1.0");
+		case SSL_LIBRARY_VERSION_TLS_1_1:
+			return pstrdup("TLSv1.1");
+		case SSL_LIBRARY_VERSION_TLS_1_2:
+			return pstrdup("TLSv1.2");
+		case SSL_LIBRARY_VERSION_TLS_1_3:
+			return pstrdup("TLSv1.3");
+	}
+
+	return pstrdup("unknown");
+}
+
+
+/*
+ * ssl_protocol_version_to_nss
+ *			Translate PostgreSQL TLS version to NSS version
+ *
+ * Returns zero in case the requested TLS version is undefined (PG_ANY) and
+ * should be set by the caller, or -1 on failure.
+ */
+static uint16
+ssl_protocol_version_to_nss(int v, const char *guc_name)
+{
+	switch (v)
+	{
+			/*
+			 * There is no SSL_LIBRARY_ macro defined in NSS with the value
+			 * zero, so we use this to signal the caller that the highest
+			 * useful version should be set on the connection.
+			 */
+		case PG_TLS_ANY:
+			return 0;
+
+			/*
+			 * No guard is required here as there are no versions of NSS
+			 * without support for TLS1.
+			 */
+		case PG_TLS1_VERSION:
+			return SSL_LIBRARY_VERSION_TLS_1_0;
+		case PG_TLS1_1_VERSION:
+#ifdef SSL_LIBRARY_VERSION_TLS_1_1
+			return SSL_LIBRARY_VERSION_TLS_1_1;
+#else
+			break;
+#endif
+		case PG_TLS1_2_VERSION:
+#ifdef SSL_LIBRARY_VERSION_TLS_1_2
+			return SSL_LIBRARY_VERSION_TLS_1_2;
+#else
+			break;
+#endif
+		case PG_TLS1_3_VERSION:
+#ifdef SSL_LIBRARY_VERSION_TLS_1_3
+			return SSL_LIBRARY_VERSION_TLS_1_3;
+#else
+			break;
+#endif
+		default:
+			break;
+	}
+
+	return -1;
+}
+
+/*
+ * pg_SSLerrmessage
+ *		Create and return a human readable error message given
+ *		the specified error code
+ *
+ * PR_ErrorToName only converts the enum identifier of the error to string,
+ * but that can be quite useful for debugging (and in case PR_ErrorToString is
+ * unable to render a message then we at least have something).
+ */
+static char *
+pg_SSLerrmessage(PRErrorCode errcode)
+{
+	return psprintf("%s (%s)",
+					PR_ErrorToString(errcode, PR_LANGUAGE_I_DEFAULT),
+					PR_ErrorToName(errcode));
+}
+
+/*
+ * pg_SSLShutdownFunc
+ *		Callback for NSS shutdown
+ *
+ * If NSS is terminated from the outside when the connection is still in use
+ * we must treat this as potentially hostile and immediately close to avoid
+ * leaking the connection in any way. Once this is called, NSS will shutdown
+ * regardless so we may as well clean up the best we can. Returning SECFailure
+ * will cause the NSS shutdown to return with an error, but it will shutdown
+ * nevertheless. nss_data is reserved for future use and is always NULL.
+ */
+static SECStatus
+pg_SSLShutdownFunc(void *private_data, void *nss_data)
+{
+	Port *port = (Port *) private_data;
+
+	if (!port || !port->ssl_in_use)
+		return SECSuccess;
+
+	/*
+	 * There is a connection still open, close it and signal to whatever that
+	 * called the shutdown that it was erroneous.
+	 */
+	be_tls_close(port);
+	be_tls_destroy();
+
+	return SECFailure;
+}
diff --git a/src/backend/libpq/be-secure.c b/src/backend/libpq/be-secure.c
index d1545a2ad6..be583d7278 100644
--- a/src/backend/libpq/be-secure.c
+++ b/src/backend/libpq/be-secure.c
@@ -50,6 +50,9 @@ bool		ssl_passphrase_command_supports_reload;
 #ifdef USE_SSL
 bool		ssl_loaded_verify_locations = false;
 #endif
+#ifdef USE_NSS
+char	   *ssl_database;
+#endif
 
 /* GUC variable controlling SSL cipher list */
 char	   *SSLCipherSuites = NULL;
diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c
index 260ec7b97e..40b9c2a883 100644
--- a/src/backend/utils/misc/guc.c
+++ b/src/backend/utils/misc/guc.c
@@ -4308,7 +4308,11 @@ static struct config_string ConfigureNamesString[] =
 		},
 		&ssl_library,
 #ifdef USE_SSL
+#if defined(USE_OPENSSL)
 		"OpenSSL",
+#elif defined(USE_NSS)
+		"NSS",
+#endif
 #else
 		"",
 #endif
@@ -4376,6 +4380,18 @@ static struct config_string ConfigureNamesString[] =
 		check_canonical_path, assign_pgstat_temp_directory, NULL
 	},
 
+#ifdef USE_NSS
+	{
+		{"ssl_database", PGC_SIGHUP, CONN_AUTH_SSL,
+			gettext_noop("Location of the NSS certificate database."),
+			NULL
+		},
+		&ssl_database,
+		"",
+		NULL, NULL, NULL
+	},
+#endif
+
 	{
 		{"synchronous_standby_names", PGC_SIGHUP, REPLICATION_PRIMARY,
 			gettext_noop("Number of synchronous standbys and list of names of potential synchronous ones."),
@@ -4404,8 +4420,10 @@ static struct config_string ConfigureNamesString[] =
 			GUC_SUPERUSER_ONLY
 		},
 		&SSLCipherSuites,
-#ifdef USE_OPENSSL
+#if defined(USE_OPENSSL)
 		"HIGH:MEDIUM:+3DES:!aNULL",
+#elif defined (USE_NSS)
+		"",
 #else
 		"none",
 #endif
diff --git a/src/common/cipher_nss.c b/src/common/cipher_nss.c
new file mode 100644
index 0000000000..9799fef32d
--- /dev/null
+++ b/src/common/cipher_nss.c
@@ -0,0 +1,192 @@
+/*-------------------------------------------------------------------------
+ *
+ * cipher_nss.c
+ *	  NSS functionality shared between frontend and backend for working
+ *	  with ciphers
+ *
+ * This should only bse used if code is compiled with NSS support.
+ *
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ *        src/common/cipher_nss.c
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#ifndef FRONTEND
+#include "postgres.h"
+#else
+#include "postgres_fe.h"
+#endif
+
+#include "common/nss.h"
+
+#define INVALID_CIPHER	0xFFFF
+
+typedef struct
+{
+	SECOidTag	signature;
+	SECOidTag	hash;
+	int			len;
+}			NSSSignatureAlgorithm;
+
+static const NSSSignatureAlgorithm NSS_SCRAMDigestAlgorithm[] = {
+
+	{SEC_OID_PKCS1_MD5_WITH_RSA_ENCRYPTION, SEC_OID_SHA256, SHA256_LENGTH},
+	{SEC_OID_PKCS1_SHA1_WITH_RSA_ENCRYPTION, SEC_OID_SHA256, SHA256_LENGTH},
+	{SEC_OID_ISO_SHA_WITH_RSA_SIGNATURE, SEC_OID_SHA256, SHA256_LENGTH},
+	{SEC_OID_ISO_SHA1_WITH_RSA_SIGNATURE, SEC_OID_SHA256, SHA256_LENGTH},
+	{SEC_OID_PKCS5_PBE_WITH_MD5_AND_DES_CBC, SEC_OID_SHA256, SHA256_LENGTH},
+
+	{SEC_OID_ANSIX962_ECDSA_SHA224_SIGNATURE, SEC_OID_SHA224, SHA224_LENGTH},
+	{SEC_OID_PKCS1_SHA224_WITH_RSA_ENCRYPTION, SEC_OID_SHA224, SHA224_LENGTH},
+	{SEC_OID_NIST_DSA_SIGNATURE_WITH_SHA224_DIGEST, SEC_OID_SHA224, SHA224_LENGTH},
+
+	{SEC_OID_ANSIX962_ECDSA_SHA256_SIGNATURE, SEC_OID_SHA256, SHA256_LENGTH},
+	{SEC_OID_PKCS1_SHA256_WITH_RSA_ENCRYPTION, SEC_OID_SHA256, SHA256_LENGTH},
+	{SEC_OID_NIST_DSA_SIGNATURE_WITH_SHA256_DIGEST, SEC_OID_SHA256, SHA256_LENGTH},
+
+	{SEC_OID_ANSIX962_ECDSA_SHA384_SIGNATURE, SEC_OID_SHA384, SHA384_LENGTH},
+	{SEC_OID_PKCS1_SHA384_WITH_RSA_ENCRYPTION, SEC_OID_SHA384, SHA384_LENGTH},
+
+	{SEC_OID_ANSIX962_ECDSA_SHA512_SIGNATURE, SEC_OID_SHA512, SHA512_LENGTH},
+	{SEC_OID_PKCS1_SHA512_WITH_RSA_ENCRYPTION, SEC_OID_SHA512, SHA512_LENGTH},
+
+	{0, 0}
+};
+
+typedef struct
+{
+	const char *name;
+	PRUint16	number;
+}			NSSCiphers;
+
+/*
+ * This list is a partial copy of the ciphers in NSS files lib/ssl/sslproto.h
+ * in order to provide a human readable version of the ciphers. It would be
+ * nice to not have to have this, but NSS doesn't provide any API addressing
+ * the ciphers by name. TODO: do we want more of the ciphers, or perhaps less?
+ */
+static const NSSCiphers NSS_CipherList[] = {
+
+	{"TLS_NULL_WITH_NULL_NULL", TLS_NULL_WITH_NULL_NULL},
+
+	{"TLS_RSA_WITH_NULL_MD5", TLS_RSA_WITH_NULL_MD5},
+	{"TLS_RSA_WITH_NULL_SHA", TLS_RSA_WITH_NULL_SHA},
+	{"TLS_RSA_WITH_RC4_128_MD5", TLS_RSA_WITH_RC4_128_MD5},
+	{"TLS_RSA_WITH_RC4_128_SHA", TLS_RSA_WITH_RC4_128_SHA},
+	{"TLS_RSA_WITH_IDEA_CBC_SHA", TLS_RSA_WITH_IDEA_CBC_SHA},
+	{"TLS_RSA_WITH_DES_CBC_SHA", TLS_RSA_WITH_DES_CBC_SHA},
+	{"TLS_RSA_WITH_3DES_EDE_CBC_SHA", TLS_RSA_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_DH_DSS_WITH_DES_CBC_SHA", TLS_DH_DSS_WITH_DES_CBC_SHA},
+	{"TLS_DH_DSS_WITH_3DES_EDE_CBC_SHA", TLS_DH_DSS_WITH_3DES_EDE_CBC_SHA},
+	{"TLS_DH_RSA_WITH_DES_CBC_SHA", TLS_DH_RSA_WITH_DES_CBC_SHA},
+	{"TLS_DH_RSA_WITH_3DES_EDE_CBC_SHA", TLS_DH_RSA_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_DHE_DSS_WITH_DES_CBC_SHA", TLS_DHE_DSS_WITH_DES_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_3DES_EDE_CBC_SHA", TLS_DHE_DSS_WITH_3DES_EDE_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_DES_CBC_SHA", TLS_DHE_RSA_WITH_DES_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA", TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_DH_anon_WITH_RC4_128_MD5", TLS_DH_anon_WITH_RC4_128_MD5},
+	{"TLS_DH_anon_WITH_DES_CBC_SHA", TLS_DH_anon_WITH_DES_CBC_SHA},
+	{"TLS_DH_anon_WITH_3DES_EDE_CBC_SHA", TLS_DH_anon_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_RSA_WITH_AES_128_CBC_SHA", TLS_RSA_WITH_AES_128_CBC_SHA},
+	{"TLS_DH_DSS_WITH_AES_128_CBC_SHA", TLS_DH_DSS_WITH_AES_128_CBC_SHA},
+	{"TLS_DH_RSA_WITH_AES_128_CBC_SHA", TLS_DH_RSA_WITH_AES_128_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_AES_128_CBC_SHA", TLS_DHE_DSS_WITH_AES_128_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_AES_128_CBC_SHA", TLS_DHE_RSA_WITH_AES_128_CBC_SHA},
+	{"TLS_DH_anon_WITH_AES_128_CBC_SHA", TLS_DH_anon_WITH_AES_128_CBC_SHA},
+
+	{"TLS_RSA_WITH_AES_256_CBC_SHA", TLS_RSA_WITH_AES_256_CBC_SHA},
+	{"TLS_DH_DSS_WITH_AES_256_CBC_SHA", TLS_DH_DSS_WITH_AES_256_CBC_SHA},
+	{"TLS_DH_RSA_WITH_AES_256_CBC_SHA", TLS_DH_RSA_WITH_AES_256_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_AES_256_CBC_SHA", TLS_DHE_DSS_WITH_AES_256_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_AES_256_CBC_SHA", TLS_DHE_RSA_WITH_AES_256_CBC_SHA},
+	{"TLS_DH_anon_WITH_AES_256_CBC_SHA", TLS_DH_anon_WITH_AES_256_CBC_SHA},
+	{"TLS_RSA_WITH_NULL_SHA256", TLS_RSA_WITH_NULL_SHA256},
+	{"TLS_RSA_WITH_AES_128_CBC_SHA256", TLS_RSA_WITH_AES_128_CBC_SHA256},
+	{"TLS_RSA_WITH_AES_256_CBC_SHA256", TLS_RSA_WITH_AES_256_CBC_SHA256},
+
+	{"TLS_DHE_DSS_WITH_AES_128_CBC_SHA256", TLS_DHE_DSS_WITH_AES_128_CBC_SHA256},
+	{"TLS_RSA_WITH_CAMELLIA_128_CBC_SHA", TLS_RSA_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DH_DSS_WITH_CAMELLIA_128_CBC_SHA", TLS_DH_DSS_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DH_RSA_WITH_CAMELLIA_128_CBC_SHA", TLS_DH_RSA_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_CAMELLIA_128_CBC_SHA", TLS_DHE_DSS_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA", TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DH_anon_WITH_CAMELLIA_128_CBC_SHA", TLS_DH_anon_WITH_CAMELLIA_128_CBC_SHA},
+
+	{"TLS_DHE_DSS_WITH_RC4_128_SHA", TLS_DHE_DSS_WITH_RC4_128_SHA},
+	{"TLS_DHE_RSA_WITH_AES_128_CBC_SHA256", TLS_DHE_RSA_WITH_AES_128_CBC_SHA256},
+	{"TLS_DHE_DSS_WITH_AES_256_CBC_SHA256", TLS_DHE_DSS_WITH_AES_256_CBC_SHA256},
+	{"TLS_DHE_RSA_WITH_AES_256_CBC_SHA256", TLS_DHE_RSA_WITH_AES_256_CBC_SHA256},
+
+	{"TLS_RSA_WITH_CAMELLIA_256_CBC_SHA", TLS_RSA_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DH_DSS_WITH_CAMELLIA_256_CBC_SHA", TLS_DH_DSS_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DH_RSA_WITH_CAMELLIA_256_CBC_SHA", TLS_DH_RSA_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_CAMELLIA_256_CBC_SHA", TLS_DHE_DSS_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA", TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DH_anon_WITH_CAMELLIA_256_CBC_SHA", TLS_DH_anon_WITH_CAMELLIA_256_CBC_SHA},
+
+	{"TLS_RSA_WITH_SEED_CBC_SHA", TLS_RSA_WITH_SEED_CBC_SHA},
+
+	{"TLS_RSA_WITH_AES_128_GCM_SHA256", TLS_RSA_WITH_AES_128_GCM_SHA256},
+	{"TLS_RSA_WITH_AES_256_GCM_SHA384", TLS_RSA_WITH_AES_256_GCM_SHA384},
+	{"TLS_DHE_RSA_WITH_AES_128_GCM_SHA256", TLS_DHE_RSA_WITH_AES_128_GCM_SHA256},
+	{"TLS_DHE_RSA_WITH_AES_256_GCM_SHA384", TLS_DHE_RSA_WITH_AES_256_GCM_SHA384},
+	{"TLS_DHE_DSS_WITH_AES_128_GCM_SHA256", TLS_DHE_DSS_WITH_AES_128_GCM_SHA256},
+	{"TLS_DHE_DSS_WITH_AES_256_GCM_SHA384", TLS_DHE_DSS_WITH_AES_256_GCM_SHA384},
+
+	{"TLS_AES_128_GCM_SHA256", TLS_AES_128_GCM_SHA256},
+	{"TLS_AES_256_GCM_SHA384", TLS_AES_256_GCM_SHA384},
+	{"TLS_CHACHA20_POLY1305_SHA256", TLS_CHACHA20_POLY1305_SHA256},
+	{NULL, 0}
+};
+
+/*
+ * pg_find_cipher
+ *			Translate an NSS ciphername to the cipher code
+ *
+ * Searches the configured ciphers for the corresponding cipher code to the
+ * name. Search is performed case insensitive.
+ */
+bool
+pg_find_cipher(char *name, PRUint16 *cipher)
+{
+	const		NSSCiphers *cipher_list;
+
+	for (cipher_list = NSS_CipherList; cipher_list->name; cipher_list++)
+	{
+		if (pg_strcasecmp(cipher_list->name, name) == 0)
+		{
+			*cipher = cipher_list->number;
+			return true;
+		}
+	}
+
+	return false;
+}
+
+bool
+pg_find_signature_algorithm(SECOidTag signature, SECOidTag *algorithm, int *len)
+{
+	const NSSSignatureAlgorithm *candidate;
+
+	candidate = NSS_SCRAMDigestAlgorithm;
+
+	for (candidate = NSS_SCRAMDigestAlgorithm; candidate->signature; candidate++)
+	{
+		if (signature == candidate->signature)
+		{
+			*algorithm = candidate->hash;
+			*len = candidate->len;
+			return true;
+		}
+	}
+
+	return false;
+}
diff --git a/src/include/common/nss.h b/src/include/common/nss.h
new file mode 100644
index 0000000000..a361dd1f68
--- /dev/null
+++ b/src/include/common/nss.h
@@ -0,0 +1,49 @@
+/*-------------------------------------------------------------------------
+ *
+ * nss.h
+ *	  NSS supporting functionality shared between frontend and backend
+ *
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ *		  src/include/common/nss.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef COMMON_NSS_H
+#define COMMON_NSS_H
+
+#ifdef USE_NSS
+
+/*
+ * BITS_PER_BYTE is also defined in the NSPR header files, so we need to undef
+ * our version to avoid compiler warnings on redefinition.
+ */
+#define pg_BITS_PER_BYTE BITS_PER_BYTE
+#undef BITS_PER_BYTE
+/*
+ * The nspr/obsolete/protypes.h NSPR header typedefs uint64 and int64 with
+ * colliding definitions from ours, causing a much expected compiler error.
+ * Remove backwards compatibility with ancient NSPR versions to avoid this.
+ */
+#define NO_NSPR_10_SUPPORT
+#include <nspr/nspr.h>
+#include <nspr/prerror.h>
+#include <nspr/prio.h>
+#include <nspr/prmem.h>
+#include <nspr/prtypes.h>
+
+
+#include <nss/nss.h>
+#include <nss/hasht.h>
+#include <nss/secoidt.h>
+#include <nss/sslproto.h>
+
+/* src/common/cipher_nss.c */
+bool pg_find_cipher(char *name, PRUint16 *cipher);
+bool pg_find_signature_algorithm(SECOidTag signature, SECOidTag *digest, int *len);
+
+#endif							/* USE_NSS */
+
+#endif							/* COMMON_NSS_H */
diff --git a/src/include/libpq/libpq-be.h b/src/include/libpq/libpq-be.h
index 7be1a67d69..eb00d9152b 100644
--- a/src/include/libpq/libpq-be.h
+++ b/src/include/libpq/libpq-be.h
@@ -200,6 +200,10 @@ typedef struct Port
 	SSL		   *ssl;
 	X509	   *peer;
 #endif
+
+#ifdef USE_NSS
+	void	   *pr_fd;
+#endif
 } Port;
 
 #ifdef USE_SSL
@@ -283,7 +287,7 @@ extern void be_tls_get_peer_serial(Port *port, char *ptr, size_t len);
  * This is not supported with old versions of OpenSSL that don't have
  * the X509_get_signature_nid() function.
  */
-#if defined(USE_OPENSSL) && defined(HAVE_X509_GET_SIGNATURE_NID)
+#if defined(USE_NSS) || (defined(USE_OPENSSL) && defined(HAVE_X509_GET_SIGNATURE_NID))
 #define HAVE_BE_TLS_GET_CERTIFICATE_HASH
 extern char *be_tls_get_certificate_hash(Port *port, size_t *len);
 #endif
@@ -293,6 +297,10 @@ extern char *be_tls_get_certificate_hash(Port *port, size_t *len);
 typedef void (*openssl_tls_init_hook_typ) (SSL_CTX *context, bool isServerStart);
 extern PGDLLIMPORT openssl_tls_init_hook_typ openssl_tls_init_hook;
 #endif
+#ifdef USE_NSS
+typedef void (*nss_tls_init_hook_type) (bool isServerStart);
+extern PGDLLIMPORT nss_tls_init_hook_type nss_tls_init_hook;
+#endif
 
 #endif							/* USE_SSL */
 
diff --git a/src/include/libpq/libpq.h b/src/include/libpq/libpq.h
index b41b10620a..ff67d0d20d 100644
--- a/src/include/libpq/libpq.h
+++ b/src/include/libpq/libpq.h
@@ -89,6 +89,9 @@ extern PGDLLIMPORT bool ssl_passphrase_command_supports_reload;
 #ifdef USE_SSL
 extern bool ssl_loaded_verify_locations;
 #endif
+#ifdef USE_NSS
+extern char *ssl_database;
+#endif
 
 extern int	secure_initialize(bool isServerStart);
 extern bool secure_loaded_verify_locations(void);
diff --git a/src/include/pg_config_manual.h b/src/include/pg_config_manual.h
index 2a12071bad..7861b94290 100644
--- a/src/include/pg_config_manual.h
+++ b/src/include/pg_config_manual.h
@@ -178,7 +178,7 @@
  * USE_SSL code should be compiled only when compiling with an SSL
  * implementation.
  */
-#ifdef USE_OPENSSL
+#if defined(USE_OPENSSL) || defined(USE_NSS)
 #define USE_SSL
 #endif
 
diff --git a/src/interfaces/libpq/fe-connect.c b/src/interfaces/libpq/fe-connect.c
index db71fea169..40bc1cd348 100644
--- a/src/interfaces/libpq/fe-connect.c
+++ b/src/interfaces/libpq/fe-connect.c
@@ -359,6 +359,10 @@ static const internalPQconninfoOption PQconninfoOptions[] = {
 		"Target-Session-Attrs", "", 11, /* sizeof("read-write") = 11 */
 	offsetof(struct pg_conn, target_session_attrs)},
 
+	{"cert_database", NULL, NULL, NULL,
+		"CertificateDatabase", "", 64,
+	offsetof(struct pg_conn, cert_database)},
+
 	/* Terminating entry --- MUST BE LAST */
 	{NULL, NULL, NULL, NULL,
 	NULL, NULL, 0}
diff --git a/src/interfaces/libpq/fe-secure-nss.c b/src/interfaces/libpq/fe-secure-nss.c
new file mode 100644
index 0000000000..72b0c54d1c
--- /dev/null
+++ b/src/interfaces/libpq/fe-secure-nss.c
@@ -0,0 +1,1088 @@
+/*-------------------------------------------------------------------------
+ *
+ * fe-secure-nss.c
+ *	  functions for supporting NSS as a TLS backend for frontend libpq
+ *
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ *	  src/interfaces/libpq/fe-secure-nss.c
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#include "postgres_fe.h"
+
+#include "libpq-fe.h"
+#include "fe-auth.h"
+#include "fe-secure-common.h"
+#include "libpq-int.h"
+#include "common/nss.h"
+
+/*
+ * The nspr/obsolete/protypes.h NSPR header typedefs uint64 and int64 with
+ * colliding definitions from ours, causing a much expected compiler error.
+ * Remove backwards compatibility with ancient NSPR versions to avoid this.
+ */
+#define NO_NSPR_10_SUPPORT
+#include <nspr/nspr.h>
+#include <nspr/prerror.h>
+#include <nspr/prinit.h>
+#include <nspr/prio.h>
+
+#include <nss/hasht.h>
+#include <nss/nss.h>
+#include <nss/ssl.h>
+#include <nss/sslproto.h>
+#include <nss/pk11func.h>
+#include <nss/secerr.h>
+#include <nss/secoidt.h>
+#include <nss/secmod.h>
+
+static SECStatus pg_load_nss_module(SECMODModule **module, const char *library, const char *name);
+static SECStatus pg_bad_cert_handler(void *arg, PRFileDesc *fd);
+static const char *pg_SSLerrmessage(PRErrorCode errcode);
+static SECStatus pg_client_auth_handler(void *arg, PRFileDesc *socket, CERTDistNames *caNames,
+										CERTCertificate **pRetCert, SECKEYPrivateKey **pRetKey);
+static SECStatus pg_cert_auth_handler(void *arg, PRFileDesc *fd, PRBool checksig, PRBool isServer);
+static int	ssl_protocol_version_to_nss(const char *protocol);
+static bool cert_database_has_CA(PGconn *conn);
+
+static char *PQssl_passwd_cb(PK11SlotInfo *slot, PRBool retry, void *arg);
+
+/*
+ * PR_ImportTCPSocket() is a private API, but very widely used, as it's the
+ * only way to make NSS use an already set up POSIX file descriptor rather
+ * than opening one itself. To quote the NSS documentation:
+ *
+ *		"In theory, code that uses PR_ImportTCPSocket may break when NSPR's
+ *		implementation changes. In practice, this is unlikely to happen because
+ *		NSPR's implementation has been stable for years and because of NSPR's
+ *		strong commitment to backward compatibility."
+ *
+ * https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSPR/Reference/PR_ImportTCPSocket
+ *
+ * The function is declared in <private/pprio.h>, but as it is a header marked
+ * private we declare it here rather than including it.
+ */
+NSPR_API(PRFileDesc *) PR_ImportTCPSocket(int);
+
+static SECMODModule *ca_trust = NULL;
+
+/*
+ * This logic exist in NSS as well, but it's only available for when there is
+ * a database to open, and not only using the system trust store. Thus, we
+ * need to keep our own copy.
+ */
+#if defined(WIN32)
+static const char *ca_trust_name = "nssckbi.dll";
+#elif defined(__darwin__)
+static const char *ca_trust_name = "libnssckbi.dylib";
+#else
+static const char *ca_trust_name = "libnssckbi.so";
+#endif
+
+static PQsslKeyPassHook_nss_type PQsslKeyPassHook = NULL;
+
+/* ------------------------------------------------------------ */
+/*			 Procedures common to all secure sessions			*/
+/* ------------------------------------------------------------ */
+
+/*
+ * pgtls_init_library
+ *
+ * There is no direct equivalent for PQinitOpenSSL in NSS/NSPR, with PR_Init
+ * being the closest match there is. PR_Init is however already documented to
+ * not be required so simply making this a noop seems like the best option.
+ */
+void
+pgtls_init_library(bool do_ssl, int do_crypto)
+{
+	/* noop */
+}
+
+int
+pgtls_init(PGconn *conn)
+{
+	conn->nss_context = NULL;
+
+	conn->ssl_in_use = false;
+	conn->has_password = false;
+
+	return 0;
+}
+
+void
+pgtls_close(PGconn *conn)
+{
+	if (conn->nss_context)
+	{
+		NSS_ShutdownContext(conn->nss_context);
+		conn->nss_context = NULL;
+	}
+}
+
+PostgresPollingStatusType
+pgtls_open_client(PGconn *conn)
+{
+	SECStatus	status;
+	PRFileDesc *pr_fd;
+	PRFileDesc *model;
+	NSSInitParameters params;
+	SSLVersionRange desired_range;
+
+	/*
+	 * The NSPR documentation states that runtime initialization via PR_Init
+	 * is no longer required, as the first caller into NSPR will perform the
+	 * initialization implicitly. See be-secure-nss.c for further discussion
+	 * on PR_Init.
+	 */
+	PR_Init(PR_USER_THREAD, PR_PRIORITY_NORMAL, 0);
+
+	/*
+	 * NSS initialization and the use of contexts is further discussed in
+	 * be-secure-nss.c
+	 */
+	memset(&params, 0, sizeof(params));
+	params.length = sizeof(params);
+
+	if (conn->cert_database && strlen(conn->cert_database) > 0)
+	{
+		char	   *cert_database_path = psprintf("sql:%s", conn->cert_database);
+
+		conn->nss_context = NSS_InitContext(cert_database_path, "", "", "",
+											&params,
+											NSS_INIT_READONLY | NSS_INIT_PK11RELOAD);
+		pfree(cert_database_path);
+
+		if (!conn->nss_context)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("unable to open certificate database \"%s\": %s"),
+							  conn->cert_database,
+							  pg_SSLerrmessage(PR_GetError()));
+			return PGRES_POLLING_FAILED;
+		}
+	}
+	else
+	{
+		conn->nss_context = NSS_InitContext("", "", "", "", &params,
+											NSS_INIT_READONLY | NSS_INIT_NOCERTDB |
+											NSS_INIT_NOMODDB | NSS_INIT_FORCEOPEN |
+											NSS_INIT_NOROOTINIT | NSS_INIT_PK11RELOAD);
+		if (!conn->nss_context)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("unable to create certificate database: %s"),
+							  pg_SSLerrmessage(PR_GetError()));
+			return PGRES_POLLING_FAILED;
+		}
+	}
+
+	/*
+	 * Configure cipher policy.
+	 */
+	status = NSS_SetDomesticPolicy();
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to configure cipher policy: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * If we don't have a certificate database, the system trust store is the
+	 * fallback we can use. If we fail to initialize that as well, we can
+	 * still attempt a connection as long as the sslmode isn't verify*.
+	 */
+	if (!conn->cert_database && conn->sslmode[0] == 'v')
+	{
+		status = pg_load_nss_module(&ca_trust, ca_trust_name, "\"Root Certificates\"");
+		if (status != SECSuccess)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("WARNING: unable to load NSS trust module \"%s\" : %s"),
+							  ca_trust_name,
+							  pg_SSLerrmessage(PR_GetError()));
+
+			return PGRES_POLLING_FAILED;
+		}
+	}
+
+
+	PK11_SetPasswordFunc(PQssl_passwd_cb);
+
+	/*
+	 * Import the already opened socket as we don't want to use NSPR functions
+	 * for opening the network socket due to how the PostgreSQL protocol works
+	 * with TLS connections. This function is not part of the NSPR public API,
+	 * see the comment at the top of the file for the rationale of still using
+	 * it.
+	 */
+	pr_fd = PR_ImportTCPSocket(conn->sock);
+	if (!pr_fd)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to attach to socket: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * Most of the documentation available, and implementations of, NSS/NSPR
+	 * use the PR_NewTCPSocket() function here, which has the drawback that it
+	 * can only create IPv4 sockets. Instead use PR_OpenTCPSocket() which
+	 * copes with IPv6 as well.
+	 */
+	model = SSL_ImportFD(NULL, PR_OpenTCPSocket(conn->laddr.addr.ss_family));
+	if (!model)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to enable TLS: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/* Disable old protocol versions (SSLv2 and SSLv3) */
+	SSL_OptionSet(model, SSL_ENABLE_SSL2, PR_FALSE);
+	SSL_OptionSet(model, SSL_V2_COMPATIBLE_HELLO, PR_FALSE);
+	SSL_OptionSet(model, SSL_ENABLE_SSL3, PR_FALSE);
+
+#ifdef SSL_CBC_RANDOM_IV
+
+	/*
+	 * Enable protection against the BEAST attack in case the NSS library has
+	 * support for that. While SSLv3 is disabled, we may still allow TLSv1
+	 * which is affected. The option isn't documented as an SSL option, but as
+	 * an NSS environment variable.
+	 */
+	SSL_OptionSet(model, SSL_CBC_RANDOM_IV, PR_TRUE);
+#endif
+
+	/* Set us up as a TLS client for the handshake */
+	SSL_OptionSet(model, SSL_HANDSHAKE_AS_CLIENT, PR_TRUE);
+
+	/*
+	 * When setting the available protocols, we either use the user defined
+	 * configuration values, and if missing we accept whatever is the highest
+	 * version supported by the library as the max and only limit the range in
+	 * the other end at TLSv1.0. ssl_variant_stream is a ProtocolVariant enum
+	 * for Stream protocols, rather than datagram.
+	 */
+	SSL_VersionRangeGetSupported(ssl_variant_stream, &desired_range);
+	desired_range.min = SSL_LIBRARY_VERSION_TLS_1_0;
+
+	if (conn->ssl_min_protocol_version && strlen(conn->ssl_min_protocol_version) > 0)
+	{
+		int			ssl_min_ver = ssl_protocol_version_to_nss(conn->ssl_min_protocol_version);
+
+		if (ssl_min_ver == -1)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("invalid value \"%s\" for minimum version of SSL protocol\n"),
+							  conn->ssl_min_protocol_version);
+			return -1;
+		}
+
+		desired_range.min = ssl_min_ver;
+	}
+
+	if (conn->ssl_max_protocol_version && strlen(conn->ssl_max_protocol_version) > 0)
+	{
+		int			ssl_max_ver = ssl_protocol_version_to_nss(conn->ssl_max_protocol_version);
+
+		if (ssl_max_ver == -1)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("invalid value \"%s\" for maximum version of SSL protocol\n"),
+							  conn->ssl_max_protocol_version);
+			return -1;
+		}
+
+		desired_range.max = ssl_max_ver;
+	}
+
+	if (SSL_VersionRangeSet(model, &desired_range) != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to set allowed SSL protocol version range: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * Set up callback for verifying server certificates, as well as for how
+	 * to handle failed verifications.
+	 */
+	SSL_AuthCertificateHook(model, pg_cert_auth_handler, (void *) conn);
+	SSL_BadCertHook(model, pg_bad_cert_handler, (void *) conn);
+
+	/*
+	 * Convert the NSPR socket to an SSL socket. Ensuring the success of this
+	 * operation is critical as NSS SSL_* functions may return SECSuccess on
+	 * the socket even though SSL hasn't been enabled, which introduce a risk
+	 * of silent downgrades.
+	 */
+	conn->pr_fd = SSL_ImportFD(model, pr_fd);
+	if (!conn->pr_fd)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to configure client for TLS: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * The model can now we closed as we've applied the settings of the model
+	 * onto the real socket. From hereon we should only use conn->pr_fd.
+	 */
+	PR_Close(model);
+
+	/* Set the private data to be passed to the password callback */
+	SSL_SetPKCS11PinArg(conn->pr_fd, (void *) conn);
+
+	status = SSL_ResetHandshake(conn->pr_fd, PR_FALSE);
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to initiate handshake: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/* Set callback for client authentication when requested by the server */
+	SSL_GetClientAuthDataHook(conn->pr_fd, pg_client_auth_handler, (void *) conn);
+
+	/*
+	 * Specify which hostname we are expecting to talk to. This is required,
+	 * albeit mostly applies to when opening a connection to a traditional
+	 * http server it seems.
+	 */
+	SSL_SetURL(conn->pr_fd, (conn->connhost[conn->whichhost]).host);
+
+	do
+	{
+		status = SSL_ForceHandshake(conn->pr_fd);
+	}
+	while (status != SECSuccess && PR_GetError() == PR_WOULD_BLOCK_ERROR);
+
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("SSL error: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	conn->ssl_in_use = true;
+	return PGRES_POLLING_OK;
+}
+
+ssize_t
+pgtls_read(PGconn *conn, void *ptr, size_t len)
+{
+	PRInt32		nread;
+	PRErrorCode status;
+	int			read_errno = 0;
+
+	/*
+	 * PR_Recv blocks until there is data to read or the timeout expires. We
+	 * don't want to sit blocked here, so the timeout is turned off by using
+	 * PR_INTERVAL_NO_WAIT which means "return immediately",  Zero is returned
+	 * for closed connections, while -1 indicates an error within the ongoing
+	 * connection.
+	 */
+	nread = PR_Recv(conn->pr_fd, ptr, len, 0, PR_INTERVAL_NO_WAIT);
+
+	if (nread == 0)
+	{
+		read_errno = ECONNRESET;
+		nread = -1;
+	}
+	else if (nread == -1)
+	{
+		status = PR_GetError();
+
+		switch (status)
+		{
+			case PR_IO_TIMEOUT_ERROR:
+				/* No data available yet. */
+				nread = 0;
+				break;
+
+			case PR_WOULD_BLOCK_ERROR:
+				read_errno = EWOULDBLOCK;
+				break;
+
+				/*
+				 * The error cases for PR_Recv are not documented, but can be
+				 * reverse engineered from _MD_unix_map_default_error() in the
+				 * NSPR code, defined in pr/src/md/unix/unix_errors.c.
+				 */
+			case PR_NETWORK_UNREACHABLE_ERROR:
+			case PR_CONNECT_RESET_ERROR:
+				read_errno = ECONNRESET;
+				break;
+
+			default:
+				break;
+		}
+
+		if (nread == -1)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("TLS read error: %s"),
+							  pg_SSLerrmessage(status));
+		}
+	}
+
+	SOCK_ERRNO_SET(read_errno);
+	return (ssize_t) nread;
+}
+
+/*
+ * pgtls_read_pending
+ *		Check for the existence of data to be read.
+ *
+ * This is part of the PostgreSQL TLS backend API.
+ */
+bool
+pgtls_read_pending(PGconn *conn)
+{
+	unsigned char c;
+	int			n;
+
+	/*
+	 * PR_Recv peeks into the stream with the timeount turned off, to see if
+	 * there is another byte to read off the wire. There is an NSS function
+	 * SSL_DataPending() which might seem like a better fit, but it will only
+	 * check already encrypted data in the SSL buffer, not still unencrypted
+	 * data, thus it doesn't guarantee that a subsequent call to
+	 * PR_Read/PR_Recv won't block.
+	 */
+	n = PR_Recv(conn->pr_fd, &c, 1, PR_MSG_PEEK, PR_INTERVAL_NO_WAIT);
+	return (n > 0);
+}
+
+ssize_t
+pgtls_write(PGconn *conn, const void *ptr, size_t len)
+{
+	PRInt32		n;
+	PRErrorCode status;
+	int			write_errno = 0;
+
+	n = PR_Write(conn->pr_fd, ptr, len);
+
+	if (n < 0)
+	{
+		status = PR_GetError();
+
+		switch (status)
+		{
+			case PR_WOULD_BLOCK_ERROR:
+#ifdef EAGAIN
+				write_errno = EAGAIN;
+#else
+				write_errno = EINTR;
+#endif
+				break;
+
+			default:
+				printfPQExpBuffer(&conn->errorMessage,
+								  libpq_gettext("TLS write error: %s"),
+								  pg_SSLerrmessage(status));
+				write_errno = ECONNRESET;
+				break;
+		}
+	}
+
+	SOCK_ERRNO_SET(write_errno);
+	return (ssize_t) n;
+}
+
+char *
+pgtls_get_peer_certificate_hash(PGconn *conn, size_t *len)
+{
+	CERTCertificate *server_cert;
+	SECOidTag	signature_tag;
+	SECOidTag	digest_alg;
+	int			digest_len;
+	PLArenaPool *arena;
+	SECItem		digest;
+	char	   *ret;
+	SECStatus	status;
+
+	*len = 0;
+
+	server_cert = SSL_PeerCertificate(conn->pr_fd);
+	if (!server_cert)
+		return NULL;
+
+	signature_tag = SECOID_GetAlgorithmTag(&server_cert->signature);
+	if (!pg_find_signature_algorithm(signature_tag, &digest_alg, &digest_len))
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("could not find digest for OID '%s'\n"),
+						  SECOID_FindOIDTagDescription(signature_tag));
+		return NULL;
+	}
+
+	arena = PORT_NewArena(SEC_ASN1_DEFAULT_ARENA_SIZE);
+	digest.data = PORT_ArenaZAlloc(arena, sizeof(unsigned char) * digest_len);
+	digest.len = digest_len;
+
+	status = PK11_HashBuf(digest_alg, digest.data, server_cert->derCert.data,
+						  server_cert->derCert.len);
+
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to generate peer certificate digest: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		PORT_FreeArena(arena, PR_TRUE);
+		return NULL;
+	}
+
+	ret = pg_malloc(digest.len);
+	memcpy(ret, digest.data, digest.len);
+	*len = digest_len;
+	PORT_FreeArena(arena, PR_TRUE);
+
+	return ret;
+}
+
+/*
+ *	Verify that the server certificate matches the hostname we connected to.
+ *
+ * The certificate's Common Name and Subject Alternative Names are considered.
+ */
+int
+pgtls_verify_peer_name_matches_certificate_guts(PGconn *conn,
+												int *names_examined,
+												char **first_name)
+{
+	char	   *server_hostname = NULL;
+	CERTCertificate *server_cert = NULL;
+	SECStatus	status = SECSuccess;
+	SECItem		altname_item;
+	PLArenaPool *arena = NULL;
+	CERTGeneralName *san_list;
+	CERTGeneralName *cn;
+
+	server_hostname = SSL_RevealURL(conn->pr_fd);
+	if (!server_hostname || server_hostname[0] == '\0')
+		goto done;
+
+	/*
+	 * CERT_VerifyCertName will internally perform RFC 2818 SubjectAltName
+	 * verification.
+	 */
+	server_cert = SSL_PeerCertificate(conn->pr_fd);
+	status = CERT_VerifyCertName(server_cert, server_hostname);
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to verify server hostname: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		goto done;
+	}
+
+	status = CERT_FindCertExtension(server_cert, SEC_OID_X509_SUBJECT_ALT_NAME,
+									&altname_item);
+	if (status == SECSuccess)
+	{
+		arena = PORT_NewArena(DER_DEFAULT_CHUNKSIZE);
+		if (!arena)
+		{
+			status = SECFailure;
+			goto done;
+		}
+		san_list = CERT_DecodeAltNameExtension(arena, &altname_item);
+		if (!san_list)
+		{
+			status = SECFailure;
+			goto done;
+		}
+
+		for (cn = san_list; cn != san_list; cn = CERT_GetNextGeneralName(cn))
+		{
+			char	   *alt_name;
+			int			rv;
+			char		tmp[512];
+
+			status = CERT_RFC1485_EscapeAndQuote(tmp, sizeof(tmp),
+												 (char *) cn->name.other.data,
+												 cn->name.other.len);
+
+			if (status != SECSuccess)
+				goto done;
+
+			rv = pq_verify_peer_name_matches_certificate_name(conn, tmp,
+															  strlen(tmp),
+															  &alt_name);
+			if (alt_name)
+			{
+				if (!*first_name)
+					*first_name = alt_name;
+				else
+					free(alt_name);
+			}
+
+			if (rv == 1)
+				status = SECSuccess;
+			else
+			{
+				status = SECFailure;
+				break;
+			}
+		}
+	}
+	else if (PORT_GetError() == SEC_ERROR_EXTENSION_NOT_FOUND)
+		status = SECSuccess;
+	else
+		status = SECSuccess;
+
+done:
+	/* san_list will be freed by freeing the arena it was allocated in */
+	if (arena)
+		PORT_FreeArena(arena, PR_TRUE);
+	PR_Free(server_hostname);
+
+	if (status == SECSuccess)
+		return 1;
+
+	return 0;
+}
+
+/* ------------------------------------------------------------ */
+/*			PostgreSQL specific TLS support functions			*/
+/* ------------------------------------------------------------ */
+
+static const char *
+pg_SSLerrmessage(PRErrorCode errcode)
+{
+	const char *error;
+
+	/*
+	 * Try to get the user friendly error description, and if that fails try
+	 * to fall back on the name of the PRErrorCode.
+	 */
+	error = PR_ErrorToString(errcode, PR_LANGUAGE_I_DEFAULT);
+	if (!error)
+		error = PR_ErrorToName(errcode);
+	if (error)
+		return error;
+
+	return "unknown TLS error";
+}
+
+static SECStatus
+pg_load_nss_module(SECMODModule **module, const char *library, const char *name)
+{
+	SECMODModule *mod;
+	char	   *modulespec;
+
+	modulespec = psprintf("library=\"%s\", name=\"%s\"", library, name);
+
+	/*
+	 * Attempt to load the specified module. The second parameter is "parent"
+	 * which should always be NULL for application code. The third parameter
+	 * defines if loading should recurse which is only applicable when loading
+	 * a module from within another module. This hierarchy would have to be
+	 * defined in the modulespec, and since we don't support anything but
+	 * directly addressed modules we should pass PR_FALSE.
+	 */
+	mod = SECMOD_LoadUserModule(modulespec, NULL, PR_FALSE);
+	pfree(modulespec);
+
+	if (mod && mod->loaded)
+	{
+		*module = mod;
+		return SECSuccess;
+	}
+
+	SECMOD_DestroyModule(mod);
+	return SECFailure;
+}
+
+/* ------------------------------------------------------------ */
+/*						NSS Callbacks							*/
+/* ------------------------------------------------------------ */
+
+/*
+ * pg_cert_auth_handler
+ *			Callback for authenticating server certificate
+ *
+ * This is pretty much the same procedure as the SSL_AuthCertificate function
+ * provided by NSS, with the difference being server hostname validation. With
+ * SSL_AuthCertificate there is no way to do verify-ca, it only does the -full
+ * flavor of our sslmodes, so we need our own implementation.
+ */
+static SECStatus
+pg_cert_auth_handler(void *arg, PRFileDesc *fd, PRBool checksig, PRBool isServer)
+{
+	SECStatus	status;
+	PGconn	   *conn = (PGconn *) arg;
+	CERTCertificate *server_cert;
+	void	   *pin;
+
+	Assert(!isServer);
+
+	pin = SSL_RevealPinArg(conn->pr_fd);
+	server_cert = SSL_PeerCertificate(conn->pr_fd);
+
+	/*
+	 * VerifyCertificateNow verifies the validity using PR_now from NSPR as a
+	 * timestamp and will perform CRL and OSCP revocation checks. conn->sslcrl
+	 * does not impact NSS connections as any CRL in the NSS database will be
+	 * used automatically.
+	 */
+	status = CERT_VerifyCertificateNow((CERTCertDBHandle *) CERT_GetDefaultCertDB(),
+									   server_cert,
+									   checksig,
+									   certificateUsageSSLServer,
+									   pin,
+									   NULL);
+
+	/*
+	 * If we've already failed validation then there is no point in also
+	 * performing the hostname check for verify-full.
+	 */
+	if (status == SECSuccess)
+	{
+		if (!pq_verify_peer_name_matches_certificate(conn))
+			status = SECFailure;
+	}
+	else
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to verify certificate: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+	}
+
+	return status;
+}
+
+/*
+ * pg_client_auth_handler
+ *		Callback for client certificate validation
+ *
+ * The client auth callback is not on by default in NSS, so we need to invoke
+ * it ourselves to ensure we can do cert authentication. A TODO is to support
+ * running without a specified sslcert parameter. By retrieving all the certs
+ * via nickname from the cert database and see if we find one which apply with
+ * NSS_CmpCertChainWCANames() and PK11_FindKeyByAnyCert() we could support
+ * just running with a ssl database specified.
+ *
+ * For now, we use the default client certificate validation which requires a
+ * defined nickname to identify the cert in the database.
+ */
+static SECStatus
+pg_client_auth_handler(void *arg, PRFileDesc *socket, CERTDistNames *caNames,
+					   CERTCertificate **pRetCert, SECKEYPrivateKey **pRetKey)
+{
+	PGconn	   *conn = (PGconn *) arg;
+
+	return NSS_GetClientAuthData(conn->sslcert, socket, caNames, pRetCert, pRetKey);
+}
+
+/*
+ * pg_bad_cert_handler
+ *		Callback for failed certificate validation
+ *
+ * The TLS handshake will call this function iff the server certificate failed
+ * validation. Depending on the sslmode, we allow the connection anyways.
+ */
+static SECStatus
+pg_bad_cert_handler(void *arg, PRFileDesc *fd)
+{
+	PGconn	   *conn = (PGconn *) arg;
+	PRErrorCode err;
+
+	/*
+	 * This really shouldn't happen, as we've set the PGconn object as our
+	 * callback data, and at the callsite we know it will be populated. That
+	 * being said, the NSS code itself performs this check even when it should
+	 * not be required so let's use the same belts with our suspenders.
+	 */
+	if (!arg)
+		return SECFailure;
+
+	/*
+	 * For sslmodes other than verify-full and verify-ca we don't perform peer
+	 * validation, so return immediately.  sslmode require with a database
+	 * specified which contains a CA certificate will work like verify-ca to
+	 * be compatible with the OpenSSL implementation.
+	 */
+	if (strcmp(conn->sslmode, "require") == 0)
+	{
+		if (conn->cert_database &&
+			strlen(conn->cert_database) > 0 &&
+			cert_database_has_CA(conn))
+			return SECFailure;
+	}
+	if (conn->sslmode[0] == 'v')
+		return SECFailure;
+
+	err = PORT_GetError();
+
+	/*
+	 * TODO: these are relevant error codes that can occur in certificate
+	 * validation, figure out which we don't want for require/prefer etc.
+	 */
+	switch (err)
+	{
+		case SEC_ERROR_INVALID_AVA:
+		case SEC_ERROR_INVALID_TIME:
+		case SEC_ERROR_BAD_SIGNATURE:
+		case SEC_ERROR_EXPIRED_CERTIFICATE:
+		case SEC_ERROR_UNKNOWN_ISSUER:
+		case SEC_ERROR_UNTRUSTED_ISSUER:
+		case SEC_ERROR_UNTRUSTED_CERT:
+		case SEC_ERROR_CERT_VALID:
+		case SEC_ERROR_EXPIRED_ISSUER_CERTIFICATE:
+		case SEC_ERROR_CRL_EXPIRED:
+		case SEC_ERROR_CRL_BAD_SIGNATURE:
+		case SEC_ERROR_EXTENSION_VALUE_INVALID:
+		case SEC_ERROR_CA_CERT_INVALID:
+		case SEC_ERROR_CERT_USAGES_INVALID:
+		case SEC_ERROR_UNKNOWN_CRITICAL_EXTENSION:
+			return SECSuccess;
+			break;
+		default:
+			return SECFailure;
+			break;
+	}
+
+	/* Unreachable */
+	return SECSuccess;
+}
+
+/* ------------------------------------------------------------ */
+/*					SSL information functions					*/
+/* ------------------------------------------------------------ */
+
+/*
+ * PQgetssl
+ *
+ * Return NULL as this is legacy and defined to always be equal to calling
+ * PQsslStruct(conn, "OpenSSL"); This should ideally trigger a logged warning
+ * somewhere as it's nonsensical to run in a non-OpenSSL build.
+ */
+void *
+PQgetssl(PGconn *conn)
+{
+	return NULL;
+}
+
+void *
+PQsslStruct(PGconn *conn, const char *struct_name)
+{
+	if (!conn)
+		return NULL;
+
+	/*
+	 * Return the underlying PRFileDesc which can be used to access
+	 * information on the connection details. There is no SSL context per se.
+	 */
+	if (strcmp(struct_name, "NSS") == 0)
+		return conn->pr_fd;
+	return NULL;
+}
+
+const char *const *
+PQsslAttributeNames(PGconn *conn)
+{
+	static const char *const result[] = {
+		"library",
+		"cipher",
+		"protocol",
+		"key_bits",
+		"compression",
+		NULL
+	};
+
+	return result;
+}
+
+const char *
+PQsslAttribute(PGconn *conn, const char *attribute_name)
+{
+	SECStatus	status;
+	SSLChannelInfo channel;
+	SSLCipherSuiteInfo suite;
+
+	if (!conn || !conn->pr_fd)
+		return NULL;
+
+	if (strcmp(attribute_name, "library") == 0)
+		return "NSS";
+
+	status = SSL_GetChannelInfo(conn->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+		return NULL;
+
+	status = SSL_GetCipherSuiteInfo(channel.cipherSuite, &suite, sizeof(suite));
+	if (status != SECSuccess)
+		return NULL;
+
+	if (strcmp(attribute_name, "cipher") == 0)
+		return suite.cipherSuiteName;
+
+	if (strcmp(attribute_name, "key_bits") == 0)
+	{
+		static char key_bits_str[8];
+
+		snprintf(key_bits_str, sizeof(key_bits_str), "%i", suite.effectiveKeyBits);
+		return key_bits_str;
+	}
+
+	if (strcmp(attribute_name, "protocol") == 0)
+	{
+		switch (channel.protocolVersion)
+		{
+#ifdef SSL_LIBRARY_VERSION_TLS_1_3
+			case SSL_LIBRARY_VERSION_TLS_1_3:
+				return "TLSv1.3";
+#endif
+#ifdef SSL_LIBRARY_VERSION_TLS_1_2
+			case SSL_LIBRARY_VERSION_TLS_1_2:
+				return "TLSv1.2";
+#endif
+#ifdef SSL_LIBRARY_VERSION_TLS_1_1
+			case SSL_LIBRARY_VERSION_TLS_1_1:
+				return "TLSv1.1";
+#endif
+			case SSL_LIBRARY_VERSION_TLS_1_0:
+				return "TLSv1.0";
+			default:
+				return "unknown";
+		}
+	}
+
+	/*
+	 * NSS disabled support for compression in version 3.33, and it was only
+	 * available for SSLv3 at that point anyways, so we can safely return off
+	 * here without checking.
+	 */
+	if (strcmp(attribute_name, "compression") == 0)
+		return "off";
+
+	return NULL;
+}
+
+static int
+ssl_protocol_version_to_nss(const char *protocol)
+{
+	if (pg_strcasecmp("TLSv1", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_0;
+
+#ifdef SSL_LIBRARY_VERSION_TLS_1_1
+	if (pg_strcasecmp("TLSv1.1", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_1;
+#endif
+
+#ifdef SSL_LIBRARY_VERSION_TLS_1_2
+	if (pg_strcasecmp("TLSv1.2", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_2;
+#endif
+
+#ifdef SSL_LIBRARY_VERSION_TLS_1_3
+	if (pg_strcasecmp("TLSv1.3", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_3;
+#endif
+
+	return -1;
+}
+
+/*
+ * cert_database_has_CA
+ *		 Check for the presence of a CA certificate
+ *
+ * Returns true in case there is a CA certificate in the database connected
+ * to in the conn object, else false. This function only checks for the
+ * presence of a CA certificate, not it's validity and/or usefulness.
+ */
+static bool
+cert_database_has_CA(PGconn *conn)
+{
+	CERTCertList *certificates;
+	bool		hasCA;
+
+	/*
+	 * If the certificate database has a password we must provide it, since
+	 * this API doesn't invoke the standard password callback.
+	 */
+	if (conn->has_password)
+		certificates = PK11_ListCerts(PK11CertListCA, PQssl_passwd_cb(NULL, PR_FALSE, (void *) conn));
+	else
+		certificates = PK11_ListCerts(PK11CertListCA, NULL);
+	hasCA = !CERT_LIST_EMPTY(certificates);
+	CERT_DestroyCertList(certificates);
+
+	return hasCA;
+}
+
+PQsslKeyPassHook_nss_type
+PQgetSSLKeyPassHook_nss(void)
+{
+	return PQsslKeyPassHook;
+}
+
+void
+PQsetSSLKeyPassHook_nss(PQsslKeyPassHook_nss_type hook)
+{
+	PQsslKeyPassHook = hook;
+}
+
+/*
+ * PQssl_passwd_cb
+ *		 Supply a password to decrypt an object
+ *
+ * If an object in the NSS database is password protected, or if the entire
+ * NSS database is itself password protected, this callback will be invoked.
+ *
+ * This must match NSS type PK11PasswordFunc.
+ */
+static char *
+PQssl_passwd_cb(PK11SlotInfo *slot, PRBool retry, void *arg)
+{
+	PGconn	   *conn = (PGconn *) arg;
+
+	conn->has_password = true;
+
+	if (PQsslKeyPassHook)
+		return PQsslKeyPassHook(slot, (PRBool) retry, arg);
+	else
+		return PQdefaultSSLKeyPassHook_nss(slot, retry, arg);
+}
+
+/*
+ * PQdefaultSSLKeyPassHook_nss
+ * 		 Default password handler callback
+ *
+ * If no user defined password callback has been set up, the callback below
+ * will try the password set by the sslpassword parameter. Since we by legacy
+ * only have support for a single password, there is little reason to inspect
+ * the slot for the object in question. A TODO is to support different
+ * passwords for different objects, either via a DSL in sslpassword or with a
+ * new key/value style parameter. Users can supply their own password hook to
+ * do this of course, but it would be nice to support something in core too.
+ */
+char *
+PQdefaultSSLKeyPassHook_nss(PK11SlotInfo *slot, PRBool retry, void *arg)
+{
+	PGconn	   *conn = (PGconn *) arg;
+
+	/*
+	 * If the password didn't work the first time there is no point in
+	 * retrying as it hasn't changed.
+	 */
+	if (retry != PR_TRUE && conn->sslpassword && strlen(conn->sslpassword) > 0)
+		return PORT_Strdup(conn->sslpassword);
+
+	return NULL;
+}
diff --git a/src/interfaces/libpq/fe-secure.c b/src/interfaces/libpq/fe-secure.c
index c601071838..7f10da3010 100644
--- a/src/interfaces/libpq/fe-secure.c
+++ b/src/interfaces/libpq/fe-secure.c
@@ -448,6 +448,27 @@ PQdefaultSSLKeyPassHook_OpenSSL(char *buf, int size, PGconn *conn)
 }
 #endif							/* USE_OPENSSL */
 
+#ifndef USE_NSS
+
+PQsslKeyPassHook_nss_type
+PQgetSSLKeyPassHook_nss(void)
+{
+	return NULL;
+}
+
+void
+PQsetSSLKeyPassHook_nss(PQsslKeyPassHook_nss_type hook)
+{
+	return;
+}
+
+char *
+PQdefaultSSLKeyPassHook_nss(PK11SlotInfo * slot, PRBool retry, void *arg)
+{
+	return NULL;
+}
+#endif							/* USE_NSS */
+
 /* Dummy version of GSSAPI information functions, when built without GSS support */
 #ifndef ENABLE_GSS
 
diff --git a/src/interfaces/libpq/libpq-fe.h b/src/interfaces/libpq/libpq-fe.h
index effe0ccf85..aba32e6635 100644
--- a/src/interfaces/libpq/libpq-fe.h
+++ b/src/interfaces/libpq/libpq-fe.h
@@ -625,6 +625,17 @@ extern PQsslKeyPassHook_OpenSSL_type PQgetSSLKeyPassHook_OpenSSL(void);
 extern void PQsetSSLKeyPassHook_OpenSSL(PQsslKeyPassHook_OpenSSL_type hook);
 extern int	PQdefaultSSLKeyPassHook_OpenSSL(char *buf, int size, PGconn *conn);
 
+/* == in fe-secure-nss.c === */
+typedef struct PK11SlotInfoStr PK11SlotInfo;
+typedef int PRIntn;
+typedef PRIntn PRBool;
+
+/* Support for overriding sslpassword handling with a callback */
+typedef char *(*PQsslKeyPassHook_nss_type) (PK11SlotInfo *slot, PRBool retry, void *arg);
+extern PQsslKeyPassHook_nss_type PQgetSSLKeyPassHook_nss(void);
+extern void PQsetSSLKeyPassHook_nss(PQsslKeyPassHook_nss_type hook);
+extern char *PQdefaultSSLKeyPassHook_nss(PK11SlotInfo *slot, PRBool retry, void *arg);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/src/interfaces/libpq/libpq-int.h b/src/interfaces/libpq/libpq-int.h
index ce36aabd25..d7103f0bf2 100644
--- a/src/interfaces/libpq/libpq-int.h
+++ b/src/interfaces/libpq/libpq-int.h
@@ -363,6 +363,7 @@ struct pg_conn
 	char	   *sslrootcert;	/* root certificate filename */
 	char	   *sslcrl;			/* certificate revocation list filename */
 	char	   *sslcrldir;		/* certificate revocation list directory name */
+	char	   *cert_database;	/* NSS certificate/key database */
 	char	   *requirepeer;	/* required peer credentials for local sockets */
 	char	   *gssencmode;		/* GSS mode (require,prefer,disable) */
 	char	   *krbsrvname;		/* Kerberos service name */
@@ -486,6 +487,28 @@ struct pg_conn
 								 * OpenSSL version changes */
 #endif
 #endif							/* USE_OPENSSL */
+
+/*
+ * The NSS/NSPR specific types aren't used to avoid pulling in the required
+ * headers here, as they are causing conflicts with PG definitions.
+ */
+#ifdef USE_NSS
+	void	   *nss_context;	/* NSS connection specific context */
+	void	   *pr_fd;			/* NSPR file descriptor for the connection */
+
+	/*
+	 * Track whether the NSS database has a password set or not. There is no
+	 * API function for retrieving password status of a database, but we need
+	 * to know since some NSS API calls require the password passed in (they
+	 * don't call the callback themselves). To track, we simply flip this to
+	 * true in case NSS invoked the password callback - as that will only
+	 * happen in case there is a password. The reason for tracking this is
+	 * that there are calls which require a password parameter, but doesn't
+	 * use the callbacks provided, so we must call the callback on behalf of
+	 * these.
+	 */
+	bool		has_password;
+#endif							/* USE_NSS */
 #endif							/* USE_SSL */
 
 #ifdef ENABLE_GSS
@@ -760,7 +783,7 @@ extern ssize_t pgtls_write(PGconn *conn, const void *ptr, size_t len);
  * This is not supported with old versions of OpenSSL that don't have
  * the X509_get_signature_nid() function.
  */
-#if defined(USE_OPENSSL) && defined(HAVE_X509_GET_SIGNATURE_NID)
+#if defined(USE_NSS) || (defined(USE_OPENSSL) && defined(HAVE_X509_GET_SIGNATURE_NID))
 #define HAVE_PGTLS_GET_PEER_CERTIFICATE_HASH
 extern char *pgtls_get_peer_certificate_hash(PGconn *conn, size_t *len);
 #endif
-- 
2.21.1 (Apple Git-122.3)

From 373354960ac90aa18b5f20b44ffc6859e71abf03 Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Mon, 8 Feb 2021 23:52:55 +0100
Subject: [PATCH v29 9/9] nss: Build infrastructure

Finally this adds the infrastructure to build a postgres installation
with libnss support.
---
 configure                     | 294 +++++++++++++++++++++++++++++++++-
 configure.ac                  |  31 +++-
 src/backend/libpq/Makefile    |   4 +
 src/common/Makefile           |   6 +
 src/include/pg_config.h.in    |  12 ++
 src/interfaces/libpq/Makefile |   5 +
 src/tools/msvc/Install.pm     |   3 +-
 src/tools/msvc/Mkvcbuild.pm   |  39 ++++-
 src/tools/msvc/Solution.pm    |  20 +++
 9 files changed, 402 insertions(+), 12 deletions(-)

diff --git a/configure b/configure
index ce9ea36999..143726c79c 100755
--- a/configure
+++ b/configure
@@ -654,6 +654,8 @@ UUID_LIBS
 LDAP_LIBS_BE
 LDAP_LIBS_FE
 with_ssl
+NSPR_CONFIG
+NSS_CONFIG
 PTHREAD_CFLAGS
 PTHREAD_LIBS
 PTHREAD_CC
@@ -1570,7 +1572,7 @@ Optional Packages:
                           use system time zone data in DIR
   --without-zlib          do not use Zlib
   --with-gnu-ld           assume the C compiler uses GNU ld [default=no]
-  --with-ssl=LIB          use LIB for SSL/TLS support (openssl)
+  --with-ssl=LIB          use LIB for SSL/TLS support (openssl, nss)
   --with-openssl          obsolete spelling of --with-ssl=openssl
 
 Some influential environment variables:
@@ -12462,8 +12464,274 @@ done
 
 $as_echo "#define USE_OPENSSL 1" >>confdefs.h
 
+elif test "$with_ssl" = nss ; then
+  # TODO: fallback in case nss-config/nspr-config aren't found.
+  if test -z "$NSS_CONFIG"; then
+  for ac_prog in nss-config
+do
+  # Extract the first word of "$ac_prog", so it can be a program name with args.
+set dummy $ac_prog; ac_word=$2
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
+$as_echo_n "checking for $ac_word... " >&6; }
+if ${ac_cv_path_NSS_CONFIG+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  case $NSS_CONFIG in
+  [\\/]* | ?:[\\/]*)
+  ac_cv_path_NSS_CONFIG="$NSS_CONFIG" # Let the user override the test with a path.
+  ;;
+  *)
+  as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH
+do
+  IFS=$as_save_IFS
+  test -z "$as_dir" && as_dir=.
+    for ac_exec_ext in '' $ac_executable_extensions; do
+  if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
+    ac_cv_path_NSS_CONFIG="$as_dir/$ac_word$ac_exec_ext"
+    $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
+    break 2
+  fi
+done
+  done
+IFS=$as_save_IFS
+
+  ;;
+esac
+fi
+NSS_CONFIG=$ac_cv_path_NSS_CONFIG
+if test -n "$NSS_CONFIG"; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $NSS_CONFIG" >&5
+$as_echo "$NSS_CONFIG" >&6; }
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+fi
+
+
+  test -n "$NSS_CONFIG" && break
+done
+
+else
+  # Report the value of NSS_CONFIG in configure's output in all cases.
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for NSS_CONFIG" >&5
+$as_echo_n "checking for NSS_CONFIG... " >&6; }
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $NSS_CONFIG" >&5
+$as_echo "$NSS_CONFIG" >&6; }
+fi
+
+  if test -z "$NSPR_CONFIG"; then
+  for ac_prog in nspr-config
+do
+  # Extract the first word of "$ac_prog", so it can be a program name with args.
+set dummy $ac_prog; ac_word=$2
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
+$as_echo_n "checking for $ac_word... " >&6; }
+if ${ac_cv_path_NSPR_CONFIG+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  case $NSPR_CONFIG in
+  [\\/]* | ?:[\\/]*)
+  ac_cv_path_NSPR_CONFIG="$NSPR_CONFIG" # Let the user override the test with a path.
+  ;;
+  *)
+  as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH
+do
+  IFS=$as_save_IFS
+  test -z "$as_dir" && as_dir=.
+    for ac_exec_ext in '' $ac_executable_extensions; do
+  if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
+    ac_cv_path_NSPR_CONFIG="$as_dir/$ac_word$ac_exec_ext"
+    $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
+    break 2
+  fi
+done
+  done
+IFS=$as_save_IFS
+
+  ;;
+esac
+fi
+NSPR_CONFIG=$ac_cv_path_NSPR_CONFIG
+if test -n "$NSPR_CONFIG"; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $NSPR_CONFIG" >&5
+$as_echo "$NSPR_CONFIG" >&6; }
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+fi
+
+
+  test -n "$NSPR_CONFIG" && break
+done
+
+else
+  # Report the value of NSPR_CONFIG in configure's output in all cases.
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for NSPR_CONFIG" >&5
+$as_echo_n "checking for NSPR_CONFIG... " >&6; }
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $NSPR_CONFIG" >&5
+$as_echo "$NSPR_CONFIG" >&6; }
+fi
+
+  if test -n "$NSS_CONFIG"; then
+    NSS_LIBS=`$NSS_CONFIG --libs`
+	NSS_CFLAGS=`$NSS_CONFIG --cflags`
+  fi
+  if test -n "$NSPR_CONFIG"; then
+	NSPR_LIBS=`$NSPR_CONFIG --libs`
+	NSPR_CFLAGS=`$NSPR_CONFIG --cflags`
+  fi
+
+  LDFLAGS="$LDFLAGS $NSS_LIBS $NSPR_LIBS"
+  CFLAGS="$CFLAGS $NSS_CFLAGS $NSPR_CFLAGS"
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for NSS_InitContext in -lnss3" >&5
+$as_echo_n "checking for NSS_InitContext in -lnss3... " >&6; }
+if ${ac_cv_lib_nss3_NSS_InitContext+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lnss3  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char NSS_InitContext ();
+int
+main ()
+{
+return NSS_InitContext ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_lib_nss3_NSS_InitContext=yes
+else
+  ac_cv_lib_nss3_NSS_InitContext=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_nss3_NSS_InitContext" >&5
+$as_echo "$ac_cv_lib_nss3_NSS_InitContext" >&6; }
+if test "x$ac_cv_lib_nss3_NSS_InitContext" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_LIBNSS3 1
+_ACEOF
+
+  LIBS="-lnss3 $LIBS"
+
+else
+  as_fn_error $? "library 'nss3' is required for NSS" "$LINENO" 5
+fi
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for PR_GetDefaultIOMethods in -lnspr4" >&5
+$as_echo_n "checking for PR_GetDefaultIOMethods in -lnspr4... " >&6; }
+if ${ac_cv_lib_nspr4_PR_GetDefaultIOMethods+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lnspr4  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char PR_GetDefaultIOMethods ();
+int
+main ()
+{
+return PR_GetDefaultIOMethods ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_lib_nspr4_PR_GetDefaultIOMethods=yes
+else
+  ac_cv_lib_nspr4_PR_GetDefaultIOMethods=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_nspr4_PR_GetDefaultIOMethods" >&5
+$as_echo "$ac_cv_lib_nspr4_PR_GetDefaultIOMethods" >&6; }
+if test "x$ac_cv_lib_nspr4_PR_GetDefaultIOMethods" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_LIBNSPR4 1
+_ACEOF
+
+  LIBS="-lnspr4 $LIBS"
+
+else
+  as_fn_error $? "library 'nspr4' is required for NSS" "$LINENO" 5
+fi
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for SSL_GetImplementedCiphers in -lssl3" >&5
+$as_echo_n "checking for SSL_GetImplementedCiphers in -lssl3... " >&6; }
+if ${ac_cv_lib_ssl3_SSL_GetImplementedCiphers+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lssl3  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char SSL_GetImplementedCiphers ();
+int
+main ()
+{
+return SSL_GetImplementedCiphers ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_lib_ssl3_SSL_GetImplementedCiphers=yes
+else
+  ac_cv_lib_ssl3_SSL_GetImplementedCiphers=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_ssl3_SSL_GetImplementedCiphers" >&5
+$as_echo "$ac_cv_lib_ssl3_SSL_GetImplementedCiphers" >&6; }
+if test "x$ac_cv_lib_ssl3_SSL_GetImplementedCiphers" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_LIBSSL3 1
+_ACEOF
+
+  LIBS="-lssl3 $LIBS"
+
+else
+  as_fn_error $? "library 'ssl3' is required for NSS" "$LINENO" 5
+fi
+
+
+$as_echo "#define USE_NSS 1" >>confdefs.h
+
 elif test "$with_ssl" != no ; then
-  as_fn_error $? "--with-ssl must specify openssl" "$LINENO" 5
+  as_fn_error $? "--with-ssl must specify one of openssl or nss" "$LINENO" 5
 fi
 
 
@@ -13369,6 +13637,23 @@ else
 fi
 
 
+elif test "$with_ssl" = nss ; then
+  ac_fn_c_check_header_mongrel "$LINENO" "nss/ssl.h" "ac_cv_header_nss_ssl_h" "$ac_includes_default"
+if test "x$ac_cv_header_nss_ssl_h" = xyes; then :
+
+else
+  as_fn_error $? "header file <nss/ssl.h> is required for NSS" "$LINENO" 5
+fi
+
+
+  ac_fn_c_check_header_mongrel "$LINENO" "nss/nss.h" "ac_cv_header_nss_nss_h" "$ac_includes_default"
+if test "x$ac_cv_header_nss_nss_h" = xyes; then :
+
+else
+  as_fn_error $? "header file <nss/nss.h> is required for NSS" "$LINENO" 5
+fi
+
+
 fi
 
 if test "$with_pam" = yes ; then
@@ -18131,6 +18416,9 @@ $as_echo_n "checking which random number source to use... " >&6; }
 if test x"$with_ssl" = x"openssl" ; then
   { $as_echo "$as_me:${as_lineno-$LINENO}: result: OpenSSL" >&5
 $as_echo "OpenSSL" >&6; }
+elif test x"$with_ssl" = x"nss" ; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: NSS" >&5
+$as_echo "NSS" >&6; }
 elif test x"$PORTNAME" = x"win32" ; then
   { $as_echo "$as_me:${as_lineno-$LINENO}: result: Windows native" >&5
 $as_echo "Windows native" >&6; }
@@ -18160,7 +18448,7 @@ fi
   if test x"$ac_cv_file__dev_urandom" = x"no" ; then
     as_fn_error $? "
 no source of strong random numbers was found
-PostgreSQL can use OpenSSL, native Windows API or /dev/urandom as a source of random numbers." "$LINENO" 5
+PostgreSQL can use OpenSSL, NSS, native Windows API or /dev/urandom as a source of random numbers." "$LINENO" 5
   fi
 fi
 
diff --git a/configure.ac b/configure.ac
index f54f65febe..5ec8970588 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1201,7 +1201,7 @@ fi
 #
 # There is currently only one supported SSL/TLS library: OpenSSL.
 #
-PGAC_ARG_REQ(with, ssl, [LIB], [use LIB for SSL/TLS support (openssl)])
+PGAC_ARG_REQ(with, ssl, [LIB], [use LIB for SSL/TLS support (openssl, nss)])
 if test x"$with_ssl" = x"" ; then
   with_ssl=no
 fi
@@ -1235,8 +1235,28 @@ if test "$with_ssl" = openssl ; then
   # function was removed.
   AC_CHECK_FUNCS([CRYPTO_lock])
   AC_DEFINE([USE_OPENSSL], 1, [Define to 1 to build with OpenSSL support. (--with-ssl=openssl)])
+elif test "$with_ssl" = nss ; then
+  # TODO: fallback in case nss-config/nspr-config aren't found.
+  PGAC_PATH_PROGS(NSS_CONFIG, nss-config)
+  PGAC_PATH_PROGS(NSPR_CONFIG, nspr-config)
+  if test -n "$NSS_CONFIG"; then
+    NSS_LIBS=`$NSS_CONFIG --libs`
+	NSS_CFLAGS=`$NSS_CONFIG --cflags`
+  fi
+  if test -n "$NSPR_CONFIG"; then
+	NSPR_LIBS=`$NSPR_CONFIG --libs`
+	NSPR_CFLAGS=`$NSPR_CONFIG --cflags`
+  fi
+
+  LDFLAGS="$LDFLAGS $NSS_LIBS $NSPR_LIBS"
+  CFLAGS="$CFLAGS $NSS_CFLAGS $NSPR_CFLAGS"
+
+  AC_CHECK_LIB(nss3, NSS_InitContext, [], [AC_MSG_ERROR([library 'nss3' is required for NSS])])
+  AC_CHECK_LIB(nspr4, PR_GetDefaultIOMethods, [], [AC_MSG_ERROR([library 'nspr4' is required for NSS])])
+  AC_CHECK_LIB(ssl3, SSL_GetImplementedCiphers, [], [AC_MSG_ERROR([library 'ssl3' is required for NSS])])
+  AC_DEFINE([USE_NSS], 1, [Define to 1 if you have NSS support,])
 elif test "$with_ssl" != no ; then
-  AC_MSG_ERROR([--with-ssl must specify openssl])
+  AC_MSG_ERROR([--with-ssl must specify one of openssl or nss])
 fi
 AC_SUBST(with_ssl)
 
@@ -1414,6 +1434,9 @@ fi
 if test "$with_ssl" = openssl ; then
   AC_CHECK_HEADER(openssl/ssl.h, [], [AC_MSG_ERROR([header file <openssl/ssl.h> is required for OpenSSL])])
   AC_CHECK_HEADER(openssl/err.h, [], [AC_MSG_ERROR([header file <openssl/err.h> is required for OpenSSL])])
+elif test "$with_ssl" = nss ; then
+  AC_CHECK_HEADER(nss/ssl.h, [], [AC_MSG_ERROR([header file <nss/ssl.h> is required for NSS])])
+  AC_CHECK_HEADER(nss/nss.h, [], [AC_MSG_ERROR([header file <nss/nss.h> is required for NSS])])
 fi
 
 if test "$with_pam" = yes ; then
@@ -2170,6 +2193,8 @@ fi
 AC_MSG_CHECKING([which random number source to use])
 if test x"$with_ssl" = x"openssl" ; then
   AC_MSG_RESULT([OpenSSL])
+elif test x"$with_ssl" = x"nss" ; then
+  AC_MSG_RESULT([NSS])
 elif test x"$PORTNAME" = x"win32" ; then
   AC_MSG_RESULT([Windows native])
 else
@@ -2179,7 +2204,7 @@ else
   if test x"$ac_cv_file__dev_urandom" = x"no" ; then
     AC_MSG_ERROR([
 no source of strong random numbers was found
-PostgreSQL can use OpenSSL, native Windows API or /dev/urandom as a source of random numbers.])
+PostgreSQL can use OpenSSL, NSS, native Windows API or /dev/urandom as a source of random numbers.])
   fi
 fi
 
diff --git a/src/backend/libpq/Makefile b/src/backend/libpq/Makefile
index 8d1d16b0fc..045d2c2f6b 100644
--- a/src/backend/libpq/Makefile
+++ b/src/backend/libpq/Makefile
@@ -30,6 +30,10 @@ OBJS = \
 
 ifeq ($(with_ssl),openssl)
 OBJS += be-secure-openssl.o
+else
+ifeq ($(with_ssl),nss)
+OBJS += be-secure-nss.o
+endif
 endif
 
 ifeq ($(with_gssapi),yes)
diff --git a/src/common/Makefile b/src/common/Makefile
index 5422579a6a..57d44080b4 100644
--- a/src/common/Makefile
+++ b/src/common/Makefile
@@ -85,12 +85,18 @@ OBJS_COMMON += \
 	protocol_openssl.o \
 	cryptohash_openssl.o
 else
+ifeq ($(with_ssl),nss)
+OBJS_COMMON += \
+	cipher_nss.o \
+	cryptohash_nss.o
+else
 OBJS_COMMON += \
 	cryptohash.o \
 	md5.o \
 	sha1.o \
 	sha2.o
 endif
+endif
 
 # A few files are currently only built for frontend, not server
 # (Mkvcbuild.pm has a copy of this list, too).  logging.c is excluded
diff --git a/src/include/pg_config.h.in b/src/include/pg_config.h.in
index 04dc330119..474cc2655c 100644
--- a/src/include/pg_config.h.in
+++ b/src/include/pg_config.h.in
@@ -322,6 +322,12 @@
 /* Define to 1 if you have the `m' library (-lm). */
 #undef HAVE_LIBM
 
+/* Define to 1 if you have the `nspr4' library (-lnspr4). */
+#undef HAVE_LIBNSPR4
+
+/* Define to 1 if you have the `nss3' library (-lnss3). */
+#undef HAVE_LIBNSS3
+
 /* Define to 1 if you have the `pam' library (-lpam). */
 #undef HAVE_LIBPAM
 
@@ -334,6 +340,9 @@
 /* Define to 1 if you have the `ssl' library (-lssl). */
 #undef HAVE_LIBSSL
 
+/* Define to 1 if you have the `ssl3' library (-lssl3). */
+#undef HAVE_LIBSSL3
+
 /* Define to 1 if you have the `wldap32' library (-lwldap32). */
 #undef HAVE_LIBWLDAP32
 
@@ -899,6 +908,9 @@
 /* Define to select named POSIX semaphores. */
 #undef USE_NAMED_POSIX_SEMAPHORES
 
+/* Define to 1 if you have NSS support, */
+#undef USE_NSS
+
 /* Define to 1 to build with OpenSSL support. (--with-ssl=openssl) */
 #undef USE_OPENSSL
 
diff --git a/src/interfaces/libpq/Makefile b/src/interfaces/libpq/Makefile
index f74677eaf9..e10d8bef42 100644
--- a/src/interfaces/libpq/Makefile
+++ b/src/interfaces/libpq/Makefile
@@ -56,6 +56,11 @@ OBJS += \
 	fe-secure-openssl.o
 endif
 
+ifeq ($(with_ssl), nss)
+OBJS += \
+	fe-secure-nss.o
+endif
+
 ifeq ($(with_gssapi),yes)
 OBJS += \
 	fe-gssapi-common.o \
diff --git a/src/tools/msvc/Install.pm b/src/tools/msvc/Install.pm
index ea3af48777..afe72a7e97 100644
--- a/src/tools/msvc/Install.pm
+++ b/src/tools/msvc/Install.pm
@@ -438,7 +438,8 @@ sub CopyContribFiles
 		{
 			# These configuration-based exclusions must match vcregress.pl
 			next if ($d eq "uuid-ossp"  && !defined($config->{uuid}));
-			next if ($d eq "sslinfo"    && !defined($config->{openssl}));
+			next if ($d eq "sslinfo"    && !defined($config->{openssl})
+			  && !defined($config->{nss}));
 			next if ($d eq "xml2"       && !defined($config->{xml}));
 			next if ($d =~ /_plperl$/   && !defined($config->{perl}));
 			next if ($d =~ /_plpython$/ && !defined($config->{python}));
diff --git a/src/tools/msvc/Mkvcbuild.pm b/src/tools/msvc/Mkvcbuild.pm
index 49614106dc..53b5a71726 100644
--- a/src/tools/msvc/Mkvcbuild.pm
+++ b/src/tools/msvc/Mkvcbuild.pm
@@ -132,6 +132,11 @@ sub mkvcbuild
 		push(@pgcommonallfiles, 'cryptohash_openssl.c');
 		push(@pgcommonallfiles, 'protocol_openssl.c');
 	}
+	elsif ($solution->{options}->{nss})
+	{
+		push(@pgcommonallfiles, 'cryptohash_nss.c');
+		push(@pgcommonallfiles, 'cipher_nss.c');
+	}
 	else
 	{
 		push(@pgcommonallfiles, 'cryptohash.c');
@@ -196,12 +201,19 @@ sub mkvcbuild
 	$postgres->FullExportDLL('postgres.lib');
 
 	# The OBJS scraper doesn't know about ifdefs, so remove appropriate files
-	# if building without OpenSSL.
-	if (!$solution->{options}->{openssl})
+	# if building without various options.
+	if (!$solution->{options}->{openssl} && !$solution->{options}->{nss})
 	{
 		$postgres->RemoveFile('src/backend/libpq/be-secure-common.c');
+	}
+	if (!$solution->{options}->{openssl})
+	{
 		$postgres->RemoveFile('src/backend/libpq/be-secure-openssl.c');
 	}
+	if (!$solution->{options}->{nss})
+	{
+		$postgres->RemoveFile('src/backend/libpq/be-secure-nss.c');
+	}
 	if (!$solution->{options}->{gss})
 	{
 		$postgres->RemoveFile('src/backend/libpq/be-gssapi-common.c');
@@ -259,12 +271,19 @@ sub mkvcbuild
 	$libpq->AddReference($libpgcommon, $libpgport);
 
 	# The OBJS scraper doesn't know about ifdefs, so remove appropriate files
-	# if building without OpenSSL.
-	if (!$solution->{options}->{openssl})
+	# if building without various options
+	if (!$solution->{options}->{openssl} && !$solution->{options}->{nss})
 	{
 		$libpq->RemoveFile('src/interfaces/libpq/fe-secure-common.c');
+	}
+	if (!$solution->{options}->{openssl})
+	{
 		$libpq->RemoveFile('src/interfaces/libpq/fe-secure-openssl.c');
 	}
+	if (!$solution->{options}->{nss})
+	{
+		$libpq->RemoveFile('src/interfaces/libpq/fe-secure-nss.c');
+	}
 	if (!$solution->{options}->{gss})
 	{
 		$libpq->RemoveFile('src/interfaces/libpq/fe-gssapi-common.c');
@@ -432,9 +451,14 @@ sub mkvcbuild
 		push @contrib_excludes, 'xml2';
 	}
 
+	if (!$solution->{options}->{openssl} && !$solution->{options}->{nss})
+	{
+		push @contrib_excludes, 'sslinfo';
+	}
+
 	if (!$solution->{options}->{openssl})
 	{
-		push @contrib_excludes, 'sslinfo', 'ssl_passphrase_callback';
+		push @contrib_excludes, 'ssl_passphrase_callback';
 	}
 
 	if (!$solution->{options}->{uuid})
@@ -464,6 +488,11 @@ sub mkvcbuild
 		$pgcrypto->AddFiles('contrib/pgcrypto', 'openssl.c',
 			'pgp-mpi-openssl.c');
 	}
+	elsif ($solution->{options}->{nss})
+	{
+		$pgcrypto->AddFiles('contrib/pgcrypto', 'nss.c',
+			'pgp-mpi-internal.c', 'imath.c', 'blf.c');
+	}
 	else
 	{
 		$pgcrypto->AddFiles(
diff --git a/src/tools/msvc/Solution.pm b/src/tools/msvc/Solution.pm
index 2aa062b2c9..0b0fbffa5e 100644
--- a/src/tools/msvc/Solution.pm
+++ b/src/tools/msvc/Solution.pm
@@ -488,6 +488,7 @@ sub GenerateFiles
 		USE_LLVM                   => undef,
 		USE_NAMED_POSIX_SEMAPHORES => undef,
 		USE_OPENSSL                => undef,
+		USE_NSS                    => undef,
 		USE_PAM                    => undef,
 		USE_SLICING_BY_8_CRC32C    => undef,
 		USE_SSE42_CRC32C           => undef,
@@ -540,6 +541,10 @@ sub GenerateFiles
 			$define{HAVE_OPENSSL_INIT_SSL}      = 1;
 		}
 	}
+	if ($self->{options}->{nss})
+	{
+		$define{USE_NSS} = 1;
+	}
 
 	$self->GenerateConfigHeader('src/include/pg_config.h',     \%define, 1);
 	$self->GenerateConfigHeader('src/include/pg_config_ext.h', \%define, 0);
@@ -1008,6 +1013,21 @@ sub AddProject
 			}
 		}
 	}
+	if ($self->{options}->{nss})
+	{
+		$proj->AddIncludeDir($self->{options}->{nss} . '\..\public\nss');
+		$proj->AddIncludeDir($self->{options}->{nss} . '\include\nspr');
+		foreach my $lib (qw(plds4 plc4 nspr4))
+		{
+			$proj->AddLibrary($self->{options}->{nss} .
+							  '\lib\lib' . "$lib.lib", 0);
+		}
+		foreach my $lib (qw(ssl3 smime3 nss3))
+		{
+			$proj->AddLibrary($self->{options}->{nss} .
+							  '\lib' . "\\$lib.dll.lib", 0);
+		}
+	}
 	if ($self->{options}->{nls})
 	{
 		$proj->AddIncludeDir($self->{options}->{nls} . '\include');
-- 
2.21.1 (Apple Git-122.3)

From e1772794d2f1f476d5124aab984f1015f3109bbc Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Mon, 8 Feb 2021 23:52:51 +0100
Subject: [PATCH v29 8/9] nss: Support NSS in cryptohash

This adds support for using libnss as a crypto backend for the built-
in cryptohash support. Much of this code is similar to the pgcrypto
support.
---
 src/common/cryptohash_nss.c | 264 ++++++++++++++++++++++++++++++++++++
 1 file changed, 264 insertions(+)
 create mode 100644 src/common/cryptohash_nss.c

diff --git a/src/common/cryptohash_nss.c b/src/common/cryptohash_nss.c
new file mode 100644
index 0000000000..59ba9c1697
--- /dev/null
+++ b/src/common/cryptohash_nss.c
@@ -0,0 +1,264 @@
+/*-------------------------------------------------------------------------
+ *
+ * cryptohash_nss.c
+ *	  Set of wrapper routines on top of NSS to support cryptographic
+ *	  hash functions.
+ *
+ * This should only be used if code is compiled with NSS support.
+ *
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ *		  src/common/cryptohash_nss.c
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#ifndef FRONTEND
+#include "postgres.h"
+#else
+#include "postgres_fe.h"
+#endif
+
+#include "common/nss.h"
+
+#include <nss/nss.h>
+#include <nss/hasht.h>
+#include <nss/pk11func.h>
+#include <nss/pk11pub.h>
+#include <nss/secitem.h>
+#include <nss/sechash.h>
+#include <nss/secoid.h>
+#include <nss/secerr.h>
+
+#include "common/cryptohash.h"
+#ifndef FRONTEND
+#include "utils/memutils.h"
+#include "utils/resowner.h"
+#include "utils/resowner_private.h"
+#endif
+
+/*
+ * In the backend, use an allocation in TopMemoryContext to count for
+ * resowner cleanup handling.  In the frontend, use malloc to be able
+ * to return a failure status back to the caller.
+ */
+#ifndef FRONTEND
+#define ALLOC(size) MemoryContextAlloc(TopMemoryContext, size)
+#define FREE(ptr) pfree(ptr)
+#else
+#define ALLOC(size) malloc(size)
+#define FREE(ptr) free(ptr)
+#endif
+
+/*
+ * Internal pg_cryptohash_ctx structure.
+ */
+struct pg_cryptohash_ctx
+{
+	pg_cryptohash_type type;
+
+	PK11Context *pk11_context;
+	HASH_HashType hash_type;
+
+#ifndef FRONTEND
+	ResourceOwner resowner;
+#endif
+};
+
+/*
+ * pg_cryptohash_create
+ *
+ * Create and allocate a new hash context. Returns NULL on failure in the
+ * frontend, and raise error without returning in the backend.
+ */
+pg_cryptohash_ctx *
+pg_cryptohash_create(pg_cryptohash_type type)
+{
+	NSSInitParameters params;
+	pg_cryptohash_ctx *ctx;
+	SECOidData *hash;
+	SECStatus status;
+
+#ifndef FRONTEND
+	/*
+	 * Make sure that the resource owner has space to remember this reference.
+	 * This can error out with "out of memory", so do this before any other
+	 * allocation to avoid leaking.
+	 */
+	ResourceOwnerEnlargeCryptoHash(CurrentResourceOwner);
+#endif
+
+	ctx = ALLOC(sizeof(pg_cryptohash_ctx));
+
+	if (!ctx)
+		goto error;
+
+	switch(type)
+	{
+		case PG_SHA1:
+			ctx->hash_type = SEC_OID_SHA1;
+			break;
+		case PG_MD5:
+			ctx->hash_type = SEC_OID_MD5;
+			break;
+		case PG_SHA224:
+			ctx->hash_type = SEC_OID_SHA224;
+			break;
+		case PG_SHA256:
+			ctx->hash_type = SEC_OID_SHA256;
+			break;
+		case PG_SHA384:
+			ctx->hash_type = SEC_OID_SHA384;
+			break;
+		case PG_SHA512:
+			ctx->hash_type = SEC_OID_SHA512;
+			break;
+	}
+
+	/*
+	 * Initialize our own NSS context without a database backing it.
+	 */
+	memset(&params, 0, sizeof(params));
+	params.length = sizeof(params);
+	status = NSS_NoDB_Init(".");
+	if (status != SECSuccess)
+	{
+		explicit_bzero(ctx, sizeof(pg_cryptohash_ctx));
+		FREE(ctx);
+		goto error;
+	}
+
+	ctx->type = type;
+	hash = SECOID_FindOIDByTag(ctx->hash_type);
+	ctx->pk11_context = PK11_CreateDigestContext(hash->offset);
+	if (!ctx->pk11_context)
+	{
+		explicit_bzero(ctx, sizeof(pg_cryptohash_ctx));
+		FREE(ctx);
+		goto error;
+	}
+
+#ifndef FRONTEND
+	ctx->resowner = CurrentResourceOwner;
+	ResourceOwnerRememberCryptoHash(CurrentResourceOwner,
+									PointerGetDatum(ctx));
+#endif
+
+	return ctx;
+
+error:
+#ifndef FRONTEND
+	ereport(ERROR,
+			(errcode(ERRCODE_OUT_OF_MEMORY),
+			 errmsg("out of memory")));
+#endif
+	return NULL;
+}
+
+/*
+ * pg_cryptohash_init
+ *			Initialize the passed hash context
+ *
+ * Returns 0 on success, -1 on failure.
+ */
+int
+pg_cryptohash_init(pg_cryptohash_ctx *ctx)
+{
+	SECStatus		status;
+
+	status = PK11_DigestBegin(ctx->pk11_context);
+
+	if (status != SECSuccess)
+		return -1;
+	return 0;
+}
+
+/*
+ * pg_cryptohash_update
+ *
+ * Update a hash context.  Returns 0 on success, -1 on failure.
+ */
+int
+pg_cryptohash_update(pg_cryptohash_ctx *ctx, const uint8 *data, size_t len)
+{
+	SECStatus	status;
+
+	if (ctx == NULL)
+		return -1;
+
+	status = PK11_DigestOp(ctx->pk11_context, data, len);
+	if (status != SECSuccess)
+		return -1;
+
+	return 0;
+}
+
+/*
+ * pg_cryptohash_final
+ *
+ * Finalize a hash context.  Returns 0 on success, -1 on failure.
+ */
+int
+pg_cryptohash_final(pg_cryptohash_ctx *ctx, uint8 *dest, size_t len)
+{
+	SECStatus	status;
+	unsigned int outlen;
+
+	switch (ctx->type)
+	{
+		case PG_MD5:
+			if (len < MD5_LENGTH)
+				return -1;
+			break;
+		case PG_SHA1:
+			if (len < SHA1_LENGTH)
+				return -1;
+			break;
+		case PG_SHA224:
+			if (len < SHA224_LENGTH)
+				return -1;
+			break;
+		case PG_SHA256:
+			if (len < SHA256_LENGTH)
+				return -1;
+			break;
+		case PG_SHA384:
+			if (len < SHA384_LENGTH)
+				return -1;
+			break;
+		case PG_SHA512:
+			if (len < SHA512_LENGTH)
+				return -1;
+			break;
+	}
+
+	status = PK11_DigestFinal(ctx->pk11_context, dest, &outlen, len);
+
+	if (status != SECSuccess)
+		return -1;
+
+	return 0;
+}
+
+/*
+ * pg_cryptohash_free
+ *
+ * Free a hash context and the associated NSS context.
+ */
+void
+pg_cryptohash_free(pg_cryptohash_ctx *ctx)
+{
+	PRBool		free_context = PR_TRUE;
+
+	if (!ctx)
+		return;
+
+	PK11_DestroyContext(ctx->pk11_context, free_context);
+#ifndef FRONTEND
+	ResourceOwnerForgetCryptoHash(ctx->resowner, PointerGetDatum(ctx));
+#endif
+	explicit_bzero(ctx, sizeof(pg_cryptohash_ctx));
+	FREE(ctx);
+}
-- 
2.21.1 (Apple Git-122.3)

From 1e73a35c4d08aad1ee7f41172642aaa1e38581f0 Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Mon, 8 Feb 2021 23:52:48 +0100
Subject: [PATCH v29 7/9] nss: Support NSS in sslinfo

Since sslinfo to a large extent use the be_tls_* API this mostly
disables functionality which currently is OpenSSL specific.
---
 contrib/sslinfo/sslinfo.c | 32 ++++++++++++++++++++++++++++++++
 doc/src/sgml/sslinfo.sgml | 12 +++++++++++-
 2 files changed, 43 insertions(+), 1 deletion(-)

diff --git a/contrib/sslinfo/sslinfo.c b/contrib/sslinfo/sslinfo.c
index 30cae0bb98..3aadd90aa6 100644
--- a/contrib/sslinfo/sslinfo.c
+++ b/contrib/sslinfo/sslinfo.c
@@ -9,9 +9,11 @@
 
 #include "postgres.h"
 
+#ifdef USE_OPENSSL
 #include <openssl/x509.h>
 #include <openssl/x509v3.h>
 #include <openssl/asn1.h>
+#endif
 
 #include "access/htup_details.h"
 #include "funcapi.h"
@@ -21,6 +23,7 @@
 
 PG_MODULE_MAGIC;
 
+#ifdef USE_OPENSSL
 static Datum X509_NAME_field_to_text(X509_NAME *name, text *fieldName);
 static Datum ASN1_STRING_to_text(ASN1_STRING *str);
 
@@ -31,6 +34,7 @@ typedef struct
 {
 	TupleDesc	tupdesc;
 } SSLExtensionInfoContext;
+#endif
 
 /*
  * Indicates whether current session uses SSL
@@ -131,6 +135,7 @@ ssl_client_serial(PG_FUNCTION_ARGS)
 }
 
 
+#ifdef USE_OPENSSL
 /*
  * Converts OpenSSL ASN1_STRING structure into text
  *
@@ -282,7 +287,23 @@ ssl_issuer_field(PG_FUNCTION_ARGS)
 	else
 		return result;
 }
+#endif							/* USE_OPENSSL */
 
+#ifdef USE_NSS
+PG_FUNCTION_INFO_V1(ssl_client_dn_field);
+Datum
+ssl_client_dn_field(PG_FUNCTION_ARGS)
+{
+	PG_RETURN_NULL();
+}
+
+PG_FUNCTION_INFO_V1(ssl_issuer_field);
+Datum
+ssl_issuer_field(PG_FUNCTION_ARGS)
+{
+	PG_RETURN_NULL();
+}
+#endif							/* USE_NSS */
 
 /*
  * Returns current client certificate subject as one string
@@ -338,6 +359,7 @@ ssl_issuer_dn(PG_FUNCTION_ARGS)
 }
 
 
+#ifdef USE_OPENSSL
 /*
  * Returns information about available SSL extensions.
  *
@@ -471,3 +493,13 @@ ssl_extension_info(PG_FUNCTION_ARGS)
 	/* All done */
 	SRF_RETURN_DONE(funcctx);
 }
+#endif							/* USE_OPENSSL */
+
+#ifdef USE_NSS
+PG_FUNCTION_INFO_V1(ssl_extension_info);
+Datum
+ssl_extension_info(PG_FUNCTION_ARGS)
+{
+	PG_RETURN_NULL();
+}
+#endif							/* USE_NSS */
diff --git a/doc/src/sgml/sslinfo.sgml b/doc/src/sgml/sslinfo.sgml
index 2a9c45a111..f3ae2fc3b8 100644
--- a/doc/src/sgml/sslinfo.sgml
+++ b/doc/src/sgml/sslinfo.sgml
@@ -22,7 +22,8 @@
 
  <para>
   This extension won't build at all unless the installation was
-  configured with <literal>--with-ssl=openssl</literal>.
+  configured with SSL support, such as <literal>--with-ssl=openssl</literal>
+  or <literal>--with-ssl=nss</literal>.
  </para>
 
  <sect2>
@@ -208,6 +209,9 @@ emailAddress
      the X.500 and X.509 standards, so you cannot just assign arbitrary
      meaning to them.
     </para>
+    <para>
+     This function is only available when using <productname>OpenSSL</productname>.
+    </para>
     </listitem>
    </varlistentry>
 
@@ -223,6 +227,9 @@ emailAddress
      Same as <function>ssl_client_dn_field</function>, but for the certificate issuer
      rather than the certificate subject.
     </para>
+    <para>
+     This function is only available when using <productname>OpenSSL</productname>.
+    </para>
     </listitem>
    </varlistentry>
 
@@ -238,6 +245,9 @@ emailAddress
      Provide information about extensions of client certificate: extension name,
      extension value, and if it is a critical extension.
     </para>
+    <para>
+     This function is only available when using <productname>OpenSSL</productname>.
+    </para>
     </listitem>
    </varlistentry>
   </variablelist>
-- 
2.21.1 (Apple Git-122.3)

From 4bc85ff8cb3cdac35af2fe2ff48683e46c931228 Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Mon, 8 Feb 2021 23:52:45 +0100
Subject: [PATCH v29 6/9] nss: Support NSS in pgcrypto

This extends pgcrypto to be able to use libnss as a cryptographic
backend for pgcrypto much like how OpenSSL is a supported backend.
Blowfish is not a supported cipher in NSS, so the implementation
falls back on the built-in BF code to be compatible in terms of
cipher support.
---
 contrib/pgcrypto/Makefile  |   7 +-
 contrib/pgcrypto/nss.c     | 753 +++++++++++++++++++++++++++++++++++++
 doc/src/sgml/pgcrypto.sgml |  38 +-
 3 files changed, 787 insertions(+), 11 deletions(-)
 create mode 100644 contrib/pgcrypto/nss.c

diff --git a/contrib/pgcrypto/Makefile b/contrib/pgcrypto/Makefile
index c0b4f1fcf6..ede7a78146 100644
--- a/contrib/pgcrypto/Makefile
+++ b/contrib/pgcrypto/Makefile
@@ -7,11 +7,14 @@ INT_TESTS = sha2
 OSSL_SRCS = openssl.c pgp-mpi-openssl.c
 OSSL_TESTS = sha2 des 3des cast5
 
+NSS_SRCS = nss.c pgp-mpi-internal.c imath.c blf.c
+NSS_TESTS = sha2 des 3des
+
 ZLIB_TST = pgp-compression
 ZLIB_OFF_TST = pgp-zlib-DISABLED
 
-CF_SRCS = $(if $(subst openssl,,$(with_ssl)), $(INT_SRCS), $(OSSL_SRCS))
-CF_TESTS = $(if $(subst openssl,,$(with_ssl)), $(INT_TESTS), $(OSSL_TESTS))
+CF_SRCS = $(if $(findstring openssl, $(with_ssl)), $(OSSL_SRCS), $(if $(findstring nss, $(with_ssl)), $(NSS_SRCS), $(INT_SRCS)))
+CF_TESTS = $(if $(findstring openssl, $(with_ssl)), $(OSSL_TESTS), $(if $(findstring nss, $(with_ssl)), $(NSS_TESTS), $(INT_TESTS)))
 CF_PGP_TESTS = $(if $(subst no,,$(with_zlib)), $(ZLIB_TST), $(ZLIB_OFF_TST))
 
 SRCS = \
diff --git a/contrib/pgcrypto/nss.c b/contrib/pgcrypto/nss.c
new file mode 100644
index 0000000000..d4fd4680ec
--- /dev/null
+++ b/contrib/pgcrypto/nss.c
@@ -0,0 +1,753 @@
+/*-------------------------------------------------------------------------
+ *
+ * nss.c
+ *	  Wrapper for using NSS as a backend for pgcrypto PX
+ *
+ *
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ *	  contrib/pgcrypto/nss.c
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#include "postgres.h"
+
+#include "px.h"
+#include "blf.h"
+#include "common/nss.h"
+#include "utils/memutils.h"
+
+#include <nss/nss.h>
+#include <nss/hasht.h>
+#include <nss/pk11func.h>
+#include <nss/pk11pub.h>
+#include <nss/secitem.h>
+#include <nss/sechash.h>
+#include <nss/secoid.h>
+#include <nss/secerr.h>
+
+/*
+ * Define our own mechanisms for Blowfish as it's not implemented by NSS.
+ */
+#define BLOWFISH_CBC	(1)
+#define BLOWFISH_ECB	(2)
+
+/*
+ * Data structures for recording cipher implementations as well as ongoing
+ * cipher operations.
+ */
+typedef struct nss_digest
+{
+	NSSInitContext *context;
+	PK11Context *hash_context;
+	HASH_HashType hash_type;
+}			nss_digest;
+
+typedef struct cipher_implementation
+{
+	/* Function pointers to cipher operations */
+	int			(*init) (PX_Cipher *pxc, const uint8 *key, unsigned klen, const uint8 *iv);
+	unsigned	(*get_block_size) (PX_Cipher *pxc);
+	unsigned	(*get_key_size) (PX_Cipher *pxc);
+	unsigned	(*get_iv_size) (PX_Cipher *pxc);
+	int			(*encrypt) (PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res);
+	int			(*decrypt) (PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res);
+	void		(*free) (PX_Cipher *pxc);
+
+	/* The mechanism describing the cipher used */
+	union
+	{
+		CK_MECHANISM_TYPE nss;
+		CK_ULONG	internal;
+	}			mechanism;
+	int			keylen;
+	bool		is_nss;
+}			cipher_implementation;
+
+typedef struct nss_cipher
+{
+	const cipher_implementation *impl;
+	NSSInitContext *context;
+	PK11Context *crypt_context;
+	SECItem    *params;
+
+	PK11SymKey *encrypt_key;
+	PK11SymKey *decrypt_key;
+}			nss_cipher;
+
+typedef struct internal_cipher
+{
+	const cipher_implementation *impl;
+	BlowfishContext context;
+}			internal_cipher;
+
+typedef struct nss_cipher_ref
+{
+	const char *name;
+	const cipher_implementation *impl;
+}			nss_cipher_ref;
+
+/*
+ * Prototypes
+ */
+static unsigned nss_get_iv_size(PX_Cipher *pxc);
+static unsigned nss_get_block_size(PX_Cipher *pxc);
+
+/*
+ * nss_GetHashOidTagByHashType
+ *
+ * Returns the corresponding SECOidTag for the passed hash type. NSS 3.43
+ * includes HASH_GetHashOidTagByHashType for this purpose, but at the time of
+ * writing is not commonly available so we need our own version till then.
+ */
+static SECOidTag
+nss_GetHashOidTagByHashType(HASH_HashType type)
+{
+	if (type == HASH_AlgMD2)
+		return SEC_OID_MD2;
+	if (type == HASH_AlgMD5)
+		return SEC_OID_MD5;
+	if (type == HASH_AlgSHA1)
+		return SEC_OID_SHA1;
+	if (type == HASH_AlgSHA224)
+		return SEC_OID_SHA224;
+	if (type == HASH_AlgSHA256)
+		return SEC_OID_SHA256;
+	if (type == HASH_AlgSHA384)
+		return SEC_OID_SHA384;
+	if (type == HASH_AlgSHA512)
+		return SEC_OID_SHA512;
+
+	return SEC_OID_UNKNOWN;
+}
+
+static unsigned
+nss_digest_block_size(PX_MD *pxmd)
+{
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+	const SECHashObject *object;
+
+	object = HASH_GetHashObject(digest->hash_type);
+	return object->blocklength;
+}
+
+static unsigned
+nss_digest_result_size(PX_MD *pxmd)
+{
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+	const SECHashObject *object;
+
+	object = HASH_GetHashObject(digest->hash_type);
+	return object->length;
+}
+
+static void
+nss_digest_free(PX_MD *pxmd)
+{
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+	PRBool		free_ctx = PR_TRUE;
+
+	PK11_DestroyContext(digest->hash_context, free_ctx);
+	NSS_ShutdownContext(digest->context);
+}
+
+static void
+nss_digest_update(PX_MD *pxmd, const uint8 *data, unsigned dlen)
+{
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+
+	PK11_DigestOp(digest->hash_context, data, dlen);
+}
+
+static void
+nss_digest_reset(PX_MD *pxmd)
+{
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+
+	PK11_DigestBegin(digest->hash_context);
+}
+
+static void
+nss_digest_finish(PX_MD *pxmd, uint8 *dst)
+{
+	unsigned int outlen;
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+	const SECHashObject *object;
+
+	object = HASH_GetHashObject(digest->hash_type);
+	PK11_DigestFinal(digest->hash_context, dst, &outlen, object->length);
+}
+
+int
+px_find_digest(const char *name, PX_MD **res)
+{
+	PX_MD	   *pxmd;
+	NSSInitParameters params;
+	NSSInitContext *nss_context;
+	bool		found = false;
+	nss_digest *digest;
+	SECStatus	status;
+	SECOidData *hash;
+	HASH_HashType t;
+
+	/*
+	 * Initialize our own NSS context without a database backing it.
+	 */
+	memset(&params, 0, sizeof(params));
+	params.length = sizeof(params);
+	nss_context = NSS_InitContext("", "", "", "", &params,
+								  NSS_INIT_READONLY | NSS_INIT_NOCERTDB |
+								  NSS_INIT_NOMODDB | NSS_INIT_FORCEOPEN |
+								  NSS_INIT_NOROOTINIT | NSS_INIT_PK11RELOAD);
+
+	/*
+	 * There is no API function for looking up a digest algorithm from a name
+	 * string, but there is a publicly accessible array which can be scanned
+	 * for the name.
+	 */
+	for (t = HASH_AlgNULL + 1; t < HASH_AlgTOTAL; t++)
+	{
+		SECOidTag	hash_oid;
+		char	   *p;
+
+		hash_oid = nss_GetHashOidTagByHashType(t);
+
+		if (hash_oid == SEC_OID_UNKNOWN)
+			return PXE_NO_HASH;
+
+		hash = SECOID_FindOIDByTag(hash_oid);
+		if (pg_strcasecmp(hash->desc, name) == 0)
+		{
+			found = true;
+			break;
+		}
+
+		/*
+		 * NSS saves the algorithm names using SHA-xxx notation whereas
+		 * OpenSSL use SHAxxx. To make sure the user finds the requested
+		 * algorithm let's remove the dash and compare that spelling as well.
+		 */
+		if ((p = strchr(hash->desc, '-')) != NULL)
+		{
+			char		tmp[12];
+
+			memcpy(tmp, hash->desc, p - hash->desc);
+			memcpy(tmp + (p - hash->desc), p + 1, strlen(hash->desc) - (p - hash->desc) + 1);
+			if (pg_strcasecmp(tmp, name) == 0)
+			{
+				found = true;
+				break;
+			}
+		}
+	}
+
+	if (!found)
+		return PXE_NO_HASH;
+
+	digest = palloc(sizeof(*digest));
+
+	digest->context = nss_context;
+	digest->hash_context = PK11_CreateDigestContext(hash->offset);
+	digest->hash_type = t;
+	if (digest->hash_context == NULL)
+	{
+		pfree(digest);
+		return -1;
+	}
+
+	status = PK11_DigestBegin(digest->hash_context);
+	if (status != SECSuccess)
+	{
+		PK11_DestroyContext(digest->hash_context, PR_TRUE);
+		pfree(digest);
+		return -1;
+	}
+
+	pxmd = palloc(sizeof(*pxmd));
+	pxmd->result_size = nss_digest_result_size;
+	pxmd->block_size = nss_digest_block_size;
+	pxmd->reset = nss_digest_reset;
+	pxmd->update = nss_digest_update;
+	pxmd->finish = nss_digest_finish;
+	pxmd->free = nss_digest_free;
+	pxmd->p.ptr = (void *) digest;
+
+	*res = pxmd;
+
+	return 0;
+}
+
+static int
+bf_init(PX_Cipher *pxc, const uint8 *key, unsigned klen, const uint8 *iv)
+{
+	internal_cipher *cipher = (internal_cipher *) pxc->ptr;
+
+	blowfish_setkey(&cipher->context, key, klen);
+	if (iv)
+		blowfish_setiv(&cipher->context, iv);
+
+	return 0;
+}
+
+static int
+bf_encrypt(PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res)
+{
+	internal_cipher *cipher = (internal_cipher *) pxc->ptr;
+	uint8	   *buf;
+
+	if (dlen == 0)
+		return 0;
+
+	if (dlen & 7)
+		return PXE_NOTBLOCKSIZE;
+
+	buf = palloc(dlen);
+	memcpy(buf, data, dlen);
+
+	if (cipher->impl->mechanism.internal == BLOWFISH_ECB)
+		blowfish_encrypt_ecb(buf, dlen, &cipher->context);
+	else
+		blowfish_encrypt_cbc(buf, dlen, &cipher->context);
+
+	memcpy(res, buf, dlen);
+	pfree(buf);
+
+	return 0;
+}
+
+static int
+bf_decrypt(PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res)
+{
+	internal_cipher *cipher = (internal_cipher *) pxc->ptr;
+
+	if (dlen == 0)
+		return 0;
+
+	if (dlen & 7)
+		return PXE_NOTBLOCKSIZE;
+
+	memcpy(res, data, dlen);
+	if (cipher->impl->mechanism.internal == BLOWFISH_ECB)
+		blowfish_decrypt_ecb(res, dlen, &cipher->context);
+	else
+		blowfish_decrypt_cbc(res, dlen, &cipher->context);
+
+	return 0;
+}
+
+static void
+bf_free(PX_Cipher *pxc)
+{
+	internal_cipher *cipher = (internal_cipher *) pxc->ptr;
+
+	pfree(cipher);
+	pfree(pxc);
+}
+
+static int
+nss_symkey_blockcipher_init(PX_Cipher *pxc, const uint8 *key, unsigned klen,
+							const uint8 *iv)
+{
+	nss_cipher *cipher = (nss_cipher *) pxc->ptr;
+	SECItem		iv_item;
+	unsigned char *iv_item_data;
+	SECItem		key_item;
+	int			keylen;
+	PK11SlotInfo *slot;
+
+	if (cipher->impl->mechanism.nss == CKM_AES_CBC ||
+		cipher->impl->mechanism.nss == CKM_AES_ECB)
+	{
+		if (klen <= 128 / 8)
+			keylen = 128 / 8;
+		else if (klen <= 192 / 8)
+			keylen = 192 / 8;
+		else if (klen <= 256 / 8)
+			keylen = 256 / 8;
+		else
+			return PXE_CIPHER_INIT;
+	}
+	else
+		keylen = cipher->impl->keylen;
+
+	key_item.type = siBuffer;
+	key_item.data = (unsigned char *) key;
+	key_item.len = keylen;
+
+	/*
+	 * If hardware acceleration is configured in NSS one can theoretically get
+	 * a better slot by calling PK11_GetBestSlot() with the mechanism passed
+	 * to it. Unless there are complaints, using the simpler API will make
+	 * error handling easier though.
+	 */
+	slot = PK11_GetInternalSlot();
+	if (!slot)
+		return PXE_CIPHER_INIT;
+
+	/*
+	 * The key must be set up for the operation, and since we don't know at
+	 * this point whether we are asked to encrypt or decrypt we need to store
+	 * both versions.
+	 */
+	cipher->decrypt_key = PK11_ImportSymKey(slot, cipher->impl->mechanism.nss,
+											PK11_OriginUnwrap,
+											CKA_DECRYPT, &key_item,
+											NULL);
+	cipher->encrypt_key = PK11_ImportSymKey(slot, cipher->impl->mechanism.nss,
+											PK11_OriginUnwrap,
+											CKA_ENCRYPT, &key_item,
+											NULL);
+	PK11_FreeSlot(slot);
+
+	if (!cipher->decrypt_key || !cipher->encrypt_key)
+		return PXE_CIPHER_INIT;
+
+	if (iv)
+	{
+		iv_item.type = siBuffer;
+		iv_item.data = (unsigned char *) iv;
+		iv_item.len = nss_get_iv_size(pxc);
+	}
+	else
+	{
+		/*
+		 * The documentation states that either passing .data = 0; .len = 0;
+		 * in the iv_item, or NULL as iv_item, to PK11_ParamFromIV should be
+		 * done when IV is missing. That however leads to segfaults in the
+		 * library, the workaround that works in modern  library versions is
+		 * to pass in a keysized zeroed out IV.
+		 */
+		iv_item_data = palloc0(nss_get_iv_size(pxc));
+		iv_item.type = siBuffer;
+		iv_item.data = iv_item_data;
+		iv_item.len = nss_get_iv_size(pxc);
+	}
+
+	cipher->params = PK11_ParamFromIV(cipher->impl->mechanism.nss, &iv_item);
+
+	/* If we had to make a mock IV, free it once made into a param */
+	if (!iv)
+		pfree(iv_item_data);
+
+	if (cipher->params == NULL)
+		return PXE_CIPHER_INIT;
+
+	return 0;
+}
+
+static int
+nss_decrypt(PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res)
+{
+	nss_cipher *cipher = (nss_cipher *) pxc->ptr;
+	SECStatus	status;
+	int			outlen;
+
+	if (!cipher->crypt_context)
+	{
+		cipher->crypt_context =
+			PK11_CreateContextBySymKey(cipher->impl->mechanism.nss, CKA_DECRYPT,
+									   cipher->decrypt_key, cipher->params);
+	}
+
+	status = PK11_CipherOp(cipher->crypt_context, res, &outlen, dlen, data, dlen);
+	if (status != SECSuccess)
+		return PXE_DECRYPT_FAILED;
+
+	return 0;
+}
+
+static int
+nss_encrypt(PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res)
+{
+	nss_cipher *cipher = (nss_cipher *) pxc->ptr;
+	SECStatus	status;
+	int			outlen;
+
+	if (!cipher->crypt_context)
+	{
+		cipher->crypt_context =
+			PK11_CreateContextBySymKey(cipher->impl->mechanism.nss, CKA_ENCRYPT,
+									   cipher->decrypt_key, cipher->params);
+	}
+
+	status = PK11_CipherOp(cipher->crypt_context, res, &outlen, dlen, data, dlen);
+
+	if (status != SECSuccess)
+		return PXE_DECRYPT_FAILED;
+
+	return 0;
+}
+
+static void
+nss_free(PX_Cipher *pxc)
+{
+	nss_cipher *cipher = pxc->ptr;
+	PRBool		free_ctx = PR_TRUE;
+
+	PK11_FreeSymKey(cipher->encrypt_key);
+	PK11_FreeSymKey(cipher->decrypt_key);
+	PK11_DestroyContext(cipher->crypt_context, free_ctx);
+	NSS_ShutdownContext(cipher->context);
+	pfree(cipher);
+
+	pfree(pxc);
+}
+
+static unsigned
+nss_get_block_size(PX_Cipher *pxc)
+{
+	nss_cipher *cipher = pxc->ptr;
+
+	return PK11_GetBlockSize(cipher->impl->mechanism.nss, NULL);
+}
+
+static unsigned
+nss_get_key_size(PX_Cipher *pxc)
+{
+	nss_cipher *cipher = pxc->ptr;
+
+	return cipher->impl->keylen;
+}
+
+static unsigned
+nss_get_iv_size(PX_Cipher *pxc)
+{
+	nss_cipher *cipher = pxc->ptr;
+
+	return PK11_GetIVLength(cipher->impl->mechanism.nss);
+}
+
+static unsigned
+bf_get_block_size(PX_Cipher *pxc)
+{
+	return 8;
+}
+
+static unsigned
+bf_get_key_size(PX_Cipher *pxc)
+{
+	return 448 / 8;
+}
+
+static unsigned
+bf_get_iv_size(PX_Cipher *pxc)
+{
+	return 8;
+}
+
+/*
+ * Cipher Implementations
+ */
+static const cipher_implementation nss_des_cbc = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_DES_CBC,
+	.keylen = 8,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_des_ecb = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_DES_ECB,
+	.keylen = 8,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_des3_cbc = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_DES3_CBC,
+	.keylen = 24,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_des3_ecb = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_DES3_ECB,
+	.keylen = 24,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_aes_cbc = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_AES_CBC,
+	.keylen = 32,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_aes_ecb = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_AES_ECB,
+	.keylen = 32,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_bf_ecb = {
+	.init = bf_init,
+	.get_block_size = bf_get_block_size,
+	.get_key_size = bf_get_key_size,
+	.get_iv_size = bf_get_iv_size,
+	.encrypt = bf_encrypt,
+	.decrypt = bf_decrypt,
+	.free = bf_free,
+	.mechanism.internal = BLOWFISH_ECB,
+	.keylen = 56,
+	.is_nss = false
+};
+
+static const cipher_implementation nss_bf_cbc = {
+	.init = bf_init,
+	.get_block_size = bf_get_block_size,
+	.get_key_size = bf_get_key_size,
+	.get_iv_size = bf_get_iv_size,
+	.encrypt = bf_encrypt,
+	.decrypt = bf_decrypt,
+	.free = bf_free,
+	.mechanism.internal = BLOWFISH_CBC,
+	.keylen = 56,
+	.is_nss = false
+};
+
+/*
+ * Lookup table for finding the implementation based on a name. CAST5 as well
+ * as BLOWFISH are defined as cipher mechanisms in NSS but error out with
+ * SEC_ERROR_INVALID_ALGORITHM. Blowfish is implemented using the internal
+ * implementation while CAST5 isn't supported at all at this time,
+ */
+static const nss_cipher_ref nss_cipher_lookup[] = {
+	{"des", &nss_des_cbc},
+	{"des-cbc", &nss_des_cbc},
+	{"des-ecb", &nss_des_ecb},
+	{"des3-cbc", &nss_des3_cbc},
+	{"3des", &nss_des3_cbc},
+	{"3des-cbc", &nss_des3_cbc},
+	{"des3-ecb", &nss_des3_ecb},
+	{"3des-ecb", &nss_des3_ecb},
+	{"aes", &nss_aes_cbc},
+	{"aes-cbc", &nss_aes_cbc},
+	{"aes-ecb", &nss_aes_ecb},
+	{"rijndael", &nss_aes_cbc},
+	{"rijndael-cbc", &nss_aes_cbc},
+	{"rijndael-ecb", &nss_aes_ecb},
+	{"blowfish", &nss_bf_cbc},
+	{"blowfish-cbc", &nss_bf_cbc},
+	{"blowfish-ecb", &nss_bf_ecb},
+	{"bf", &nss_bf_cbc},
+	{"bf-cbc", &nss_bf_cbc},
+	{"bf-ecb", &nss_bf_ecb},
+	{NULL}
+};
+
+/*
+ * px_find_cipher
+ *
+ * Search for the requested cipher and see if there is support for it, and if
+ * so return an allocated object containing the playbook for how to encrypt
+ * and decrypt using the cipher.
+ */
+int
+px_find_cipher(const char *alias, PX_Cipher **res)
+{
+	const nss_cipher_ref *cipher_ref;
+	PX_Cipher  *px_cipher;
+	NSSInitParameters params;
+	NSSInitContext *nss_context;
+	nss_cipher *cipher;
+	internal_cipher *int_cipher;
+
+	for (cipher_ref = nss_cipher_lookup; cipher_ref->name; cipher_ref++)
+	{
+		if (strcmp(cipher_ref->name, alias) == 0)
+			break;
+	}
+
+	if (!cipher_ref->name)
+		return PXE_NO_CIPHER;
+
+	/*
+	 * Fill in the PX_Cipher to pass back to PX describing the operations to
+	 * perform in order to use the cipher.
+	 */
+	px_cipher = palloc(sizeof(*px_cipher));
+	px_cipher->block_size = cipher_ref->impl->get_block_size;
+	px_cipher->key_size = cipher_ref->impl->get_key_size;
+	px_cipher->iv_size = cipher_ref->impl->get_iv_size;
+	px_cipher->free = cipher_ref->impl->free;
+	px_cipher->init = cipher_ref->impl->init;
+	px_cipher->encrypt = cipher_ref->impl->encrypt;
+	px_cipher->decrypt = cipher_ref->impl->decrypt;
+
+	/*
+	 * Set the private data, which is different for NSS and internal ciphers
+	 */
+	if (cipher_ref->impl->is_nss)
+	{
+		/*
+		 * Initialize our own NSS context without a database backing it. At
+		 * some point we might want to allow users to use stored keys in the
+		 * database rather than passing them via SELECT encrypt(), and then
+		 * this need to be changed to open a user specified database.
+		 */
+		memset(&params, 0, sizeof(params));
+		params.length = sizeof(params);
+		nss_context = NSS_InitContext("", "", "", "", &params,
+									  NSS_INIT_READONLY | NSS_INIT_NOCERTDB |
+									  NSS_INIT_NOMODDB | NSS_INIT_FORCEOPEN |
+									  NSS_INIT_NOROOTINIT | NSS_INIT_PK11RELOAD);
+
+		/* nss_cipher is the private state struct for the operation */
+		cipher = palloc(sizeof(*cipher));
+		cipher->context = nss_context;
+		cipher->impl = cipher_ref->impl;
+		cipher->crypt_context = NULL;
+
+		px_cipher->ptr = cipher;
+	}
+	else
+	{
+		int_cipher = palloc0(sizeof(*int_cipher));
+
+		int_cipher->impl = cipher_ref->impl;
+		px_cipher->ptr = int_cipher;
+	}
+
+	*res = px_cipher;
+	return 0;
+}
diff --git a/doc/src/sgml/pgcrypto.sgml b/doc/src/sgml/pgcrypto.sgml
index b6bb23de0f..bf486f0c07 100644
--- a/doc/src/sgml/pgcrypto.sgml
+++ b/doc/src/sgml/pgcrypto.sgml
@@ -45,8 +45,9 @@ digest(data bytea, type text) returns bytea
     <literal>sha224</literal>, <literal>sha256</literal>,
     <literal>sha384</literal> and <literal>sha512</literal>.
     If <filename>pgcrypto</filename> was built with
-    <productname>OpenSSL</productname>, more algorithms are available, as
-    detailed in <xref linkend="pgcrypto-with-without-openssl"/>.
+    <productname>OpenSSL</productname> or <productname>NSS</productname>,
+    more algorithms are available, as
+    detailed in <xref linkend="pgcrypto-with-without-openssl-nss"/>.
    </para>
 
    <para>
@@ -764,7 +765,7 @@ pgp_sym_encrypt(data, psw, 'compress-algo=1, cipher-algo=aes256')
     Which cipher algorithm to use.
    </para>
 <literallayout>
-Values: bf, aes128, aes192, aes256 (OpenSSL-only: <literal>3des</literal>, <literal>cast5</literal>)
+Values: bf, aes128, aes192, aes256 (OpenSSL-only: <literal>3des</literal>, <literal>cast5</literal>; NSS-only: <literal>3des</literal>)
 Default: aes128
 Applies to: pgp_sym_encrypt, pgp_pub_encrypt
 </literallayout>
@@ -1153,8 +1154,8 @@ gen_random_uuid() returns uuid
    <para>
     <filename>pgcrypto</filename> configures itself according to the findings of the
     main PostgreSQL <literal>configure</literal> script.  The options that
-    affect it are <literal>--with-zlib</literal> and
-    <literal>--with-ssl=openssl</literal>.
+    affect it are <literal>--with-zlib</literal>,
+    <literal>--with-ssl=openssl</literal> and <literal>--with-ssl=nss</literal>.
    </para>
 
    <para>
@@ -1169,14 +1170,16 @@ gen_random_uuid() returns uuid
     BIGNUM functions.
    </para>
 
-   <table id="pgcrypto-with-without-openssl">
-    <title>Summary of Functionality with and without OpenSSL</title>
-    <tgroup cols="3">
+   <table id="pgcrypto-with-without-openssl-nss">
+    <title>Summary of Functionality with and without external cryptographic
+      library</title>
+    <tgroup cols="4">
      <thead>
       <row>
        <entry>Functionality</entry>
        <entry>Built-in</entry>
        <entry>With OpenSSL</entry>
+       <entry>With NSS</entry>
       </row>
      </thead>
      <tbody>
@@ -1184,51 +1187,67 @@ gen_random_uuid() returns uuid
        <entry>MD5</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>SHA1</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>SHA224/256/384/512</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>Other digest algorithms</entry>
        <entry>no</entry>
        <entry>yes (Note 1)</entry>
+       <entry>yes (Note 1)</entry>
       </row>
       <row>
        <entry>Blowfish</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>AES</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>DES/3DES/CAST5</entry>
        <entry>no</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
+      </row>
+      <row>
+       <entry>CAST5</entry>
+       <entry>no</entry>
+       <entry>yes</entry>
+       <entry>no</entry>
       </row>
       <row>
        <entry>Raw encryption</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>PGP Symmetric encryption</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>PGP Public-Key encryption</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
      </tbody>
     </tgroup>
@@ -1241,7 +1260,8 @@ gen_random_uuid() returns uuid
    <orderedlist>
     <listitem>
      <para>
-      Any digest algorithm <productname>OpenSSL</productname> supports
+      Any digest algorithm <productname>OpenSSL</productname> and
+      <productname>NSS</productname> supports
       is automatically picked up.
       This is not possible with ciphers, which need to be supported
       explicitly.
-- 
2.21.1 (Apple Git-122.3)

From d69dd599854fa85502ac9a36f97c4f42c7fb3623 Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Mon, 8 Feb 2021 23:52:42 +0100
Subject: [PATCH v29 5/9] nss: Documentation

Basic documentation of the new API (keypass hooks) as well as config
parameters and installation. Additionally there is a section on how
to create certificate and keys using the NSS toolchain.
---
 doc/src/sgml/acronyms.sgml     |  43 +++++
 doc/src/sgml/config.sgml       |  28 ++-
 doc/src/sgml/installation.sgml |  31 ++-
 doc/src/sgml/libpq.sgml        | 340 +++++++++++++++++++++++++--------
 doc/src/sgml/runtime.sgml      | 124 +++++++++++-
 5 files changed, 476 insertions(+), 90 deletions(-)

diff --git a/doc/src/sgml/acronyms.sgml b/doc/src/sgml/acronyms.sgml
index 4e5ec983c0..7b02c8a622 100644
--- a/doc/src/sgml/acronyms.sgml
+++ b/doc/src/sgml/acronyms.sgml
@@ -441,6 +441,28 @@
     </listitem>
    </varlistentry>
 
+   <varlistentry>
+    <term><acronym>NSPR</acronym></term>
+    <listitem>
+     <para>
+      <ulink
+      url="https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSPR">
+      Netscape Portable Runtime</ulink>
+     </para>
+    </listitem>
+   </varlistentry>
+
+   <varlistentry>
+    <term><acronym>NSS</acronym></term>
+    <listitem>
+     <para>
+      <ulink
+      url="https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS">
+      Network Security Services</ulink>
+     </para>
+    </listitem>
+   </varlistentry>
+
    <varlistentry>
     <term><acronym>ODBC</acronym></term>
     <listitem>
@@ -539,6 +561,17 @@
     </listitem>
    </varlistentry>
 
+   <varlistentry>
+    <term><acronym>PKCS#12</acronym></term>
+    <listitem>
+     <para>
+      <ulink
+      url="https://en.wikipedia.org/wiki/PKCS_12">
+      Public-Key Cryptography Standards #12</ulink>
+     </para>
+    </listitem>
+   </varlistentry>
+
    <varlistentry>
     <term><acronym>PL</acronym></term>
     <listitem>
@@ -684,6 +717,16 @@
     </listitem>
    </varlistentry>
 
+   <varlistentry>
+    <term><acronym>TLS</acronym></term>
+    <listitem>
+     <para>
+      <ulink url="https://en.wikipedia.org/wiki/Transport_Layer_Security">
+      Transport Layer Security</ulink>
+     </para>
+    </listitem>
+   </varlistentry>
+
    <varlistentry>
     <term><acronym>TOAST</acronym></term>
     <listitem>
diff --git a/doc/src/sgml/config.sgml b/doc/src/sgml/config.sgml
index d7a7376798..6eff5934e2 100644
--- a/doc/src/sgml/config.sgml
+++ b/doc/src/sgml/config.sgml
@@ -1272,6 +1272,23 @@ include_dir 'conf.d'
       </listitem>
      </varlistentry>
 
+     <varlistentry id="guc-ssl-database" xreflabel="ssl_database">
+      <term><varname>ssl_database</varname> (<type>string</type>)
+      <indexterm>
+       <primary><varname>ssl_database</varname> configuration parameter</primary>
+      </indexterm>
+      </term>
+      <listitem>
+       <para>
+        Specifies the name of the file containing the server certificates and
+        keys when using <productname>NSS</productname> for <acronym>SSL</acronym>
+        connections. This parameter can only be set in the
+        <filename>postgresql.conf</filename> file or on the server command
+        line.
+       </para>
+      </listitem>
+     </varlistentry>
+
      <varlistentry id="guc-ssl-ciphers" xreflabel="ssl_ciphers">
       <term><varname>ssl_ciphers</varname> (<type>string</type>)
       <indexterm>
@@ -1288,7 +1305,9 @@ include_dir 'conf.d'
         connections using TLS version 1.2 and lower are affected.  There is
         currently no setting that controls the cipher choices used by TLS
         version 1.3 connections.  The default value is
-        <literal>HIGH:MEDIUM:+3DES:!aNULL</literal>.  The default is usually a
+        <literal>HIGH:MEDIUM:+3DES:!aNULL</literal> for servers which have
+        been built with <productname>OpenSSL</productname> as the
+        <acronym>SSL</acronym> library.  The default is usually a
         reasonable choice unless you have specific security requirements.
        </para>
 
@@ -1490,8 +1509,11 @@ include_dir 'conf.d'
        <para>
         Sets an external command to be invoked when a passphrase for
         decrypting an SSL file such as a private key needs to be obtained.  By
-        default, this parameter is empty, which means the built-in prompting
-        mechanism is used.
+        default, this parameter is empty. When the server is using
+        <productname>OpenSSL</productname>, this means the built-in prompting
+        mechanism is used. When using <productname>NSS</productname>, there is
+        no default prompting so a blank callback will be used returning an
+        empty password.
        </para>
        <para>
         The command must print the passphrase to the standard output and exit
diff --git a/doc/src/sgml/installation.sgml b/doc/src/sgml/installation.sgml
index 66ad4ba938..3cbd125d59 100644
--- a/doc/src/sgml/installation.sgml
+++ b/doc/src/sgml/installation.sgml
@@ -976,14 +976,31 @@ build-postgresql:
        <listitem>
         <para>
          Build with support for <acronym>SSL</acronym> (encrypted)
-         connections. The only <replaceable>LIBRARY</replaceable>
-         supported is <option>openssl</option>. This requires the
-         <productname>OpenSSL</productname> package to be installed.
-         <filename>configure</filename> will check for the required
-         header files and libraries to make sure that your
-         <productname>OpenSSL</productname> installation is sufficient
-         before proceeding. 
+         connections. <replaceable>LIBRARY</replaceable> must be one of:
         </para>
+        <itemizedlist>
+         <listitem>
+          <para>
+           <option>openssl</option> to build with <productname>OpenSSL</productname> support.
+            This requires the <productname>OpenSSL</productname>
+            package to be installed.  <filename>configure</filename> will check
+            for the required header files and libraries to make sure that
+            your <productname>OpenSSL</productname> installation is sufficient
+            before proceeding.
+          </para>
+         </listitem>
+         <listitem>
+          <para>
+           <option>nss</option> to build with <productname>libnss</productname> support.
+            This requires the <productname>NSS</productname> package to be installed. Additionally,
+            <productname>NSS</productname> requires <productname>NSPR</productname>
+            to be installed. <filename>configure</filename> will check for the
+            required header files and libraries to make sure that your
+            <productname>NSS</productname> installation is sufficient before
+            proceeding.
+          </para>
+         </listitem>
+        </itemizedlist>
        </listitem>
       </varlistentry>
 
diff --git a/doc/src/sgml/libpq.sgml b/doc/src/sgml/libpq.sgml
index 5e25f20843..f84896470a 100644
--- a/doc/src/sgml/libpq.sgml
+++ b/doc/src/sgml/libpq.sgml
@@ -830,6 +830,12 @@ int callback_fn(char *buf, int size, PGconn *conn);
        <function>longjmp(...)</function>, etc. It must return normally.
       </para>
 
+      <para>
+        <function>PQsetSSLKeyPassHook_OpenSSL</function> has no effect unless
+        the server was compiled with <productname>OpenSSL</productname>
+        support.
+      </para>
+
      </listitem>
     </varlistentry>
 
@@ -846,6 +852,70 @@ PQsslKeyPassHook_OpenSSL_type PQgetSSLKeyPassHook_OpenSSL(void);
 </synopsis>
       </para>
 
+      <para>
+        <function>PQgetSSLKeyPassHook_OpenSSL</function> has no effect unless
+        the server was compiled with <productname>OpenSSL</productname>
+        support.
+      </para>
+
+     </listitem>
+    </varlistentry>
+
+    <varlistentry id="libpq-pqsetsslkeypasshook-nss">
+     <term><function>PQsetSSLKeyPassHook_nss</function><indexterm><primary>PQsetSSLKeyPassHook_nss</primary></indexterm></term>
+     <listitem>
+      <para>
+       <function>PQsetSSLKeyPassHook_nss</function> lets an application override
+       <application>libpq</application>'s default handling of password protected
+       objects in the <application>NSS</application> database using
+       <xref linkend="libpq-connect-sslpassword"/> or interactive prompting.
+
+<synopsis>
+void PQsetSSLKeyPassHook_nss(PQsslKeyPassHook_nss_type hook);
+</synopsis>
+
+       The application passes a pointer to a callback function with signature:
+<programlisting>
+char *callback_fn(PK11SlotInfo *slot, PRBool retry, void *arg);
+</programlisting>
+       which <application>libpq</application> will call
+       <emphasis>instead of</emphasis> its default
+       <function>PQdefaultSSLKeyPassHook_nss</function> password handler. The
+       callback should determine the password for the token and return a
+       pointer to it. The returned pointer should be allocated with the NSS
+       <function>PORT_Strdup</function> function. The token for which the
+       password is requested is recorded in the slot anc can be identified by
+       calling <function>PK11_GetTokenName</function>. If no password is
+       known, the callback should return <literal>NULL</literal>. The memory
+       will be owned by <productname>NSS</productname> and should not be
+       freed.
+      </para>
+
+      <para>
+        <function>PQsetSSLKeyPassHook_nss</function> has no effect unless
+        the server was compiled with <productname>NSS</productname> support.
+      </para>
+     </listitem>
+    </varlistentry>
+
+    <varlistentry id="libpq-pqgetsslkeypasshook-nss">
+     <term><function>PQgetSSLKeyPassHook_nss</function><indexterm><primary>PQgetSSLKeyPassHook_nss</primary></indexterm></term>
+     <listitem>
+      <para>
+       <function>PQgetSSLKeyPassHook_nss</function> returns the current
+       <productname>NSS</productname> password hook, or <literal>NULL</literal>
+       if none has been set.
+
+<synopsis>
+PQsslKeyPassHook_nss_type PQgetSSLKeyPassHook_nss(void);
+</synopsis>
+      </para>
+
+      <para>
+        <function>PQgetSSLKeyPassHook_nss</function> has no effect unless the
+        server was compiled with <productname>nss</productname> support.
+      </para>
+
      </listitem>
     </varlistentry>
 
@@ -1623,21 +1693,31 @@ postgresql://%2Fvar%2Flib%2Fpostgresql/dbname
         If set to 1, data sent over SSL connections will be compressed.  If
         set to 0, compression will be disabled.  The default is 0.  This
         parameter is ignored if a connection without SSL is made.
-       </para>
-
-       <para>
         SSL compression is nowadays considered insecure and its use is no
-        longer recommended.  <productname>OpenSSL</productname> 1.1.0 disables
-        compression by default, and many operating system distributions
-        disable it in prior versions as well, so setting this parameter to on
-        will not have any effect if the server does not accept compression.
-       </para>
+        longer recommended.
+        <itemizedlist>
+         <listitem>
+          <para>
+           <productname>OpenSSL</productname>: 1.1.0 disables compression by
+           default, and many operating system distributions disable it in prior
+           versions as well, so setting this parameter to on will not have any
+           effect if the server does not accept compression.
+          </para>
+          <para>
+           If security is not a primary concern, compression can improve
+           throughput if the network is the bottleneck.  Disabling compression
+           can improve response time and throughput if CPU performance is the
+           limiting factor.
+          </para>
+         </listitem>
 
-       <para>
-        If security is not a primary concern, compression can improve
-        throughput if the network is the bottleneck.  Disabling compression
-        can improve response time and throughput if CPU performance is the
-        limiting factor.
+         <listitem>
+          <para>
+           <productname>NSS</productname>: SSL compression is not supported in
+           <productname>NSS</productname>, this parameter has no effect.
+          </para>
+         </listitem>
+        </itemizedlist>
        </para>
       </listitem>
      </varlistentry>
@@ -1646,10 +1726,24 @@ postgresql://%2Fvar%2Flib%2Fpostgresql/dbname
       <term><literal>sslcert</literal></term>
       <listitem>
        <para>
-        This parameter specifies the file name of the client SSL
-        certificate, replacing the default
-        <filename>~/.postgresql/postgresql.crt</filename>.
-        This parameter is ignored if an SSL connection is not made.
+        This parameter specifies the name or location of the client SSL
+        certificate.  This parameter is ignored if an SSL connection is not
+        made.
+        <itemizedlist>
+         <listitem>
+          <para>
+           <productname>OpenSSL</productname>: can replace the default
+           <filename>~/.postgresql/postgresql.crt</filename>.
+          </para>
+         </listitem>
+
+         <listitem>
+          <para>
+           <productname>NSS</productname>: the nickname of the client SSL
+           certificate.
+          </para>
+         </listitem>
+        </itemizedlist>
        </para>
       </listitem>
      </varlistentry>
@@ -1658,15 +1752,30 @@ postgresql://%2Fvar%2Flib%2Fpostgresql/dbname
       <term><literal>sslkey</literal></term>
       <listitem>
        <para>
-        This parameter specifies the location for the secret key used for
-        the client certificate. It can either specify a file name that will
-        be used instead of the default
-        <filename>~/.postgresql/postgresql.key</filename>, or it can specify a key
-        obtained from an external <quote>engine</quote> (engines are
-        <productname>OpenSSL</productname> loadable modules).  An external engine
-        specification should consist of a colon-separated engine name and
-        an engine-specific key identifier.  This parameter is ignored if an
-        SSL connection is not made.
+        This parameter specifies the name or location for the secret key used
+        for the client certificate. This parameter is ignored if an SSL
+        connection is not made.
+        <itemizedlist>
+         <listitem>
+          <para>
+           <productname>OpenSSL</productname>: can either specify a file name
+           that will be used instead of the default
+           <filename>~/.postgresql/postgresql.key</filename>, or it can specify
+           a key obtained from an external <quote>engine</quote> (engines are
+           <productname>OpenSSL</productname> loadable modules).  An external
+           engine specification should consist of a colon-separated engine name
+           and an engine-specific key identifier.
+          </para>
+         </listitem>
+
+         <listitem>
+          <para>
+           <productname>NSS</productname>: this parameter has no effect.  Keys
+           should be loaded into the <productname>NSS</productname>
+           database.
+          </para>
+         </listitem>
+        </itemizedlist>
        </para>
       </listitem>
      </varlistentry>
@@ -1677,28 +1786,44 @@ postgresql://%2Fvar%2Flib%2Fpostgresql/dbname
        <para>
         This parameter specifies the password for the secret key specified in
         <literal>sslkey</literal>, allowing client certificate private keys
-        to be stored in encrypted form on disk even when interactive passphrase
+        to be stored in encrypted form even when interactive passphrase
         input is not practical.
-       </para>
-       <para>
-        Specifying this parameter with any non-empty value suppresses the
-        <literal>Enter PEM pass phrase:</literal>
-        prompt that <productname>OpenSSL</productname> will emit by default
-        when an encrypted client certificate key is provided to
-        <literal>libpq</literal>.
-       </para>
-       <para>
-        If the key is not encrypted this parameter is ignored. The parameter
-        has no effect on keys specified by <productname>OpenSSL</productname>
-        engines unless the engine uses the <productname>OpenSSL</productname>
-        password callback mechanism for prompts.
-       </para>
-       <para>
-        There is no environment variable equivalent to this option, and no
-        facility for looking it up in <filename>.pgpass</filename>. It can be
-        used in a service file connection definition. Users with
-        more sophisticated uses should consider using openssl engines and
-        tools like PKCS#11 or USB crypto offload devices.
+        <itemizedlist>
+         <listitem>
+          <para>
+           <productname>OpenSSL</productname>: specifying this parameter with
+           any non-empty value suppresses the
+           <literal>Enter PEM pass phrase:</literal> prompt that
+           <productname>OpenSSL</productname> will emit by default when an
+           encrypted client certificate key is provided to
+           <literal>libpq</literal>.
+          </para>
+          <para>
+           If the key is not encrypted this parameter is ignored. The parameter
+           has no effect on keys specified by <productname>OpenSSL</productname>
+           engines unless the engine uses the <productname>OpenSSL</productname>
+           password callback mechanism for prompts.
+          </para>
+          <para>
+           There is no environment variable equivalent to this option, and no
+           facility for looking it up in <filename>.pgpass</filename>. It can be
+           used in a service file connection definition. Users with
+           more sophisticated uses should consider using
+           <productname>OpenSSL</productname> engines and tools like PKCS#11 or
+           USB crypto offload devices.
+          </para>
+         </listitem>
+
+         <listitem>
+          <para>
+           <productname>NSS</productname>: specifying the parameter is required
+           in case any password protected items are referenced in the
+           <productname>NSS</productname> database, or if the database itself
+           is password protected.  If multiple different objects are password
+           protected, the same password is used for all.
+          </para>
+         </listitem>
+        </itemizedlist>
        </para>
       </listitem>
      </varlistentry>
@@ -1707,11 +1832,27 @@ postgresql://%2Fvar%2Flib%2Fpostgresql/dbname
       <term><literal>sslrootcert</literal></term>
       <listitem>
        <para>
-        This parameter specifies the name of a file containing SSL
-        certificate authority (<acronym>CA</acronym>) certificate(s).
-        If the file exists, the server's certificate will be verified
-        to be signed by one of these authorities.  The default is
-        <filename>~/.postgresql/root.crt</filename>.
+        This parameter specifies the name of SSL certificate authority
+        (<acronym>CA</acronym>) certificate(s).
+        <itemizedlist>
+         <listitem>
+          <para>
+           <productname>OpenSSL</productname>: specifies the name of a file
+           containing SSL certificate authority (<acronym>CA</acronym>)
+           certificate(s).  If the file exists, the server's certificate will
+           be verified to be signed by one of these authorities.  The default is
+           <filename>~/.postgresql/root.crt</filename>.
+          </para>
+         </listitem>
+
+         <listitem>
+          <para>
+           <productname>NSS</productname>: this parameter has no effect.  CA
+           certificates should be loaded into the <productname>NSS</productname>
+           database using the <application>certutil</application> tool.
+          </para>
+         </listitem>
+        </itemizedlist>
        </para>
       </listitem>
      </varlistentry>
@@ -1721,13 +1862,29 @@ postgresql://%2Fvar%2Flib%2Fpostgresql/dbname
       <listitem>
        <para>
         This parameter specifies the file name of the SSL certificate
-        revocation list (CRL).  Certificates listed in this file, if it
-        exists, will be rejected while attempting to authenticate the
-        server's certificate.  If neither
-        <xref linkend='libpq-connect-sslcrl'/> nor
-        <xref linkend='libpq-connect-sslcrldir'/> is set, this setting is
-        taken as
-        <filename>~/.postgresql/root.crl</filename>.
+        revocation list (CRL).  
+
+        <itemizedlist>
+         <listitem>
+          <para>
+           <productname>OpenSSL</productname>: Certificates listed in this file,
+           if it exists, will be rejected while attempting to authenticate the
+           server's certificate.  If neither
+           <xref linkend='libpq-connect-sslcrl'/> nor
+           <xref linkend='libpq-connect-sslcrldir'/> is set, this setting is
+           taken as <filename>~/.postgresql/root.crl</filename>. 
+          </para>
+         </listitem>
+
+         <listitem>
+          <para>
+           <productname>NSS</productname>: This parameter has no effect.  CRL
+           files should be loaded into the <productname>NSS</productname>
+           database using the <application>crlutil</application> tool.
+          </para>
+         </listitem>
+        </itemizedlist>
+
        </para>
       </listitem>
      </varlistentry>
@@ -1740,18 +1897,30 @@ postgresql://%2Fvar%2Flib%2Fpostgresql/dbname
         revocation list (CRL).  Certificates listed in the files in this
         directory, if it exists, will be rejected while attempting to
         authenticate the server's certificate.
-       </para>
 
-       <para>
-        The directory needs to be prepared with the OpenSSL command
-        <literal>openssl rehash</literal> or <literal>c_rehash</literal>.  See
-        its documentation for details.
-       </para>
+        <itemizedlist>
+         <listitem>
+          <para>
+           <productname>OpenSSL</productname>: the directory needs to be
+           prepared with the OpenSSL command <literal>openssl rehash</literal>
+           or <literal>c_rehash</literal>.  See its documentation for details.
+          </para>
+          <para>
+           Both <literal>sslcrl</literal> and <literal>sslcrldir</literal> can
+           be specified together.
+          </para>
+         </listitem>
 
-       <para>
-        Both <literal>sslcrl</literal> and <literal>sslcrldir</literal> can be
-        specified together.
+         <listitem>
+          <para>
+           <productname>NSS</productname>: This parameter has no effect.  CRL
+           files should be loaded into the <productname>NSS</productname>
+           database using the <application>crlutil</application> tool.
+          </para>
+         </listitem>
+        </itemizedlist>
        </para>
+
       </listitem>
      </varlistentry>
 
@@ -1786,8 +1955,8 @@ postgresql://%2Fvar%2Flib%2Fpostgresql/dbname
         for the connection. Valid values are <literal>TLSv1</literal>,
         <literal>TLSv1.1</literal>, <literal>TLSv1.2</literal> and
         <literal>TLSv1.3</literal>. The supported protocols depend on the
-        version of <productname>OpenSSL</productname> used, older versions
-        not supporting the most modern protocol versions. If not specified,
+        version of the SSL library used, older versions may 
+        not support the most modern protocol versions. If not specified,
         the default is <literal>TLSv1.2</literal>, which satisfies industry
         best practices as of this writing.
        </para>
@@ -1802,8 +1971,8 @@ postgresql://%2Fvar%2Flib%2Fpostgresql/dbname
         for the connection. Valid values are <literal>TLSv1</literal>,
         <literal>TLSv1.1</literal>, <literal>TLSv1.2</literal> and
         <literal>TLSv1.3</literal>. The supported protocols depend on the
-        version of <productname>OpenSSL</productname> used, older versions
-        not supporting the most modern protocol versions. If not set, this
+        version of the SSL library used, older versions
+        may not support the most modern protocol versions. If not set, this
         parameter is ignored and the connection will use the maximum bound
         defined by the backend, if set. Setting the maximum protocol version
         is mainly useful for testing or if some component has issues working
@@ -2523,6 +2692,8 @@ void *PQsslStruct(const PGconn *conn, const char *struct_name);
       </para>
       <para>
        The struct(s) available depend on the SSL implementation in use.
+      </para>
+      <para>
        For <productname>OpenSSL</productname>, there is one struct,
        available under the name "OpenSSL", and it returns a pointer to the
        <productname>OpenSSL</productname> <literal>SSL</literal> struct.
@@ -2546,9 +2717,14 @@ void *PQsslStruct(const PGconn *conn, const char *struct_name);
 ]]></programlisting>
       </para>
       <para>
-       This structure can be used to verify encryption levels, check server
-       certificates, and more. Refer to the <productname>OpenSSL</productname>
-       documentation for information about this structure.
+       For <productname>NSS</productname>, there is one struct available under
+       the name "NSS", and it returns a pointer to the
+       <productname>NSS</productname> <literal>PRFileDesc</literal>.
+      </para>
+      <para>
+       These structures can be used to verify encryption levels, check server
+       certificates, and more. Refer to the <acronym>SSL</acronym> library
+       documentation for information about these structures.
       </para>
      </listitem>
     </varlistentry>
@@ -2575,6 +2751,10 @@ void *PQgetssl(const PGconn *conn);
        <xref linkend="libpq-PQsslInUse"/> instead, and for more details about the
        connection, use <xref linkend="libpq-PQsslAttribute"/>.
       </para>
+      <para>
+       This function returns <literal>NULL</literal> when <acronym>SSL</acronym>
+       librariaes other than <productname>OpenSSL</productname> are used.
+      </para>
      </listitem>
     </varlistentry>
 
@@ -8008,6 +8188,11 @@ void PQinitOpenSSL(int do_ssl, int do_crypto);
        before first opening a database connection.  Also be sure that you
        have done that initialization before opening a database connection.
       </para>
+
+      <para>
+       This function does nothing when using <productname>NSS</productname> as
+       the <acronym>SSL</acronym> library.
+      </para>
      </listitem>
     </varlistentry>
 
@@ -8034,6 +8219,11 @@ void PQinitSSL(int do_ssl);
        might be preferable for applications that need to work with older
        versions of <application>libpq</application>.
       </para>
+
+      <para>
+       This function does nothing when using <productname>NSS</productname> as
+       the <acronym>SSL</acronym> library.
+      </para>
      </listitem>
     </varlistentry>
    </variablelist>
diff --git a/doc/src/sgml/runtime.sgml b/doc/src/sgml/runtime.sgml
index bf877c0e0c..1fcad17a51 100644
--- a/doc/src/sgml/runtime.sgml
+++ b/doc/src/sgml/runtime.sgml
@@ -2185,15 +2185,21 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
 
   <indexterm zone="ssl-tcp">
    <primary>SSL</primary>
+   <secondary>TLS</secondary>
   </indexterm>
 
   <para>
    <productname>PostgreSQL</productname> has native support for using
    <acronym>SSL</acronym> connections to encrypt client/server communications
    for increased security. This requires that
-   <productname>OpenSSL</productname> is installed on both client and
+   a supported TLS library is installed on both client and
    server systems and that support in <productname>PostgreSQL</productname> is
    enabled at build time (see <xref linkend="installation"/>).
+   Supported libraries are <productname>OpenSSL</productname> and
+   <productname>NSS</productname>. The terms <acronym>SSL</acronym> and
+   <acronym>TLS</acronym> are often used interchangeably to mean a secure
+   connection using a <acronym>TLS</acronym> protocol, even though
+   <acronym>SSL</acronym> protocols are no longer supported.
   </para>
 
   <sect2 id="ssl-setup">
@@ -2213,8 +2219,13 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
   </para>
 
   <para>
-   To start in <acronym>SSL</acronym> mode, files containing the server certificate
-   and private key must exist.  By default, these files are expected to be
+   To start in <acronym>SSL</acronym> mode, a server certificate
+   and private key must exist. The below sections on the different libraries
+   will discuss how to configure these.
+  </para>
+   
+  <para>
+   By default, these files are expected to be
    named <filename>server.crt</filename> and <filename>server.key</filename>, respectively, in
    the server's data directory, but other names and locations can be specified
    using the configuration parameters <xref linkend="guc-ssl-cert-file"/>
@@ -2304,6 +2315,18 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
   </note>
   </sect2>
 
+  <sect2 id="ssl-nss-config">
+   <title>NSS Configuration</title>
+
+  <para>
+   <productname>PostgreSQL</productname> will look for certificates and keys
+   in the <productname>NSS</productname> database specified by the parameter
+   <xref linkend="guc-ssl-database"/> in <filename>postgresql.conf</filename>.
+   The parameters for certificate and key filenames are used to identify the
+   nicknames in the database.
+  </para>
+  </sect2>
+
   <sect2 id="ssl-client-certificates">
    <title>Using Client Certificates</title>
 
@@ -2378,7 +2401,7 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
   </sect2>
 
   <sect2 id="ssl-server-files">
-   <title>SSL Server File Usage</title>
+   <title>SSL Server File Parameter Usage</title>
 
    <para>
     <xref linkend="ssl-file-usage"/> summarizes the files that are
@@ -2425,6 +2448,14 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
       <entry>client certificate must not be on this list</entry>
      </row>
 
+     <row>
+      <entry><xref linkend="guc-ssl-database"/></entry>
+      <entry>certificate database</entry>
+      <entry>contains server certificates, keys and revocation lists; only
+      used when <productname>PostgreSQL</productname> is built with support
+      for <productname>NSS</productname>.</entry>
+     </row>
+
     </tbody>
    </tgroup>
   </table>
@@ -2448,7 +2479,7 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
   </sect2>
 
   <sect2 id="ssl-certificate-creation">
-   <title>Creating Certificates</title>
+   <title>Creating Certificates with OpenSSL</title>
 
    <para>
      To create a simple self-signed certificate for the server, valid for 365
@@ -2552,6 +2583,89 @@ openssl x509 -req -in server.csr -text -days 365 \
    </para>
   </sect2>
 
+  <sect2 id="nss-certificate-database">
+   <title>NSS Certificate Databases</title>
+
+   <para>
+    When using <productname>NSS</productname>, all certificates and keys must
+    be loaded into an <productname>NSS</productname> certificate database.
+   </para>
+
+   <para>
+    To create a new <productname>NSS</productname> certificate database and
+    load the certificates created in <xref linkend="ssl-certificate-creation" />,
+    use the following <productname>NSS</productname> commands:
+<programlisting>
+certutil -d "sql:server.db" -N --empty-password
+certutil -d "sql:server.db" -A -n server.crt -i server.crt -t "CT,C,C"
+certutil -d "sql:server.db" -A -n root.crt -i root.crt -t "CT,C,C"
+</programlisting>
+    This will give the certificate the filename as the nickname identifier in
+    the database which is created as <filename>server.db</filename>.
+   </para>
+   <para>
+    Then load the server key, which require converting it to
+    <acronym>PKCS#12</acronym> format using the
+    <productname>OpenSSL</productname> tools:
+<programlisting>
+openssl pkcs12 -export -out server.pfx -inkey server.key -in server.crt \
+  -certfile root.crt -passout pass:
+pk12util -i server.pfx -d server.db -W ''
+</programlisting>
+   </para>
+   <para>
+    Finally a certificate revocation list can be loaded with the following
+    commands:
+<programlisting>
+crlutil -I -i server.crl -d server.db -B
+</programlisting>
+   </para>
+  </sect2>
+
+  <sect2 id="nss-ssl-certificate-creation">
+   <title>Creating Certificates with NSS</title>
+
+   <para>
+    To create a simple self-signed CA and certificate for the server, use the
+    following NSS commands. Replace
+    <replaceable>*.yourdomain.com</replaceable> with the server's host
+    name. Remove <replaceable>--empty-password</replaceable> in order to set
+    a password protecting the databases. The password can be passed to
+    <application>certutil</application> with the <literal>-f</literal> parameter.
+    First create a self-signed CA. To use a different certificate validity
+    time than the default, use <replaceable>-v</replaceable> to specify the
+    number of months of validity.
+<programlisting>
+mkdir root_ca.db
+certutil -N -d "sql:root_ca.db/" --empty-password
+certutil -S -d "sql:root_ca.db/" -n root_ca -s "CN=<replaceable>ca.yourdomain.com</replaceable>" \
+  -x -k rsa -g 2048 -m <replaceable>5432</replaceable> -t CTu,CTu,CTu \
+  --keyUsage certSigning -2 --nsCertType sslCA,smimeCA,objectSigningCA \
+  -Z SHA256
+certutil -L -d "sql:root_ca.db/" -n root_ca -a > root_ca.pem
+</programlisting>
+    Now create a server certificate database, and create a certificate signing
+    request for the CA. Then sign the request with the already created CA and
+    insert the certificate chain into the certificate database.
+<programlisting>
+mkdir server_cert.db
+certutil -N -d "sql:server_cert.db/" --empty-password
+certutil -R -d "sql:server_cert.db/" -s "CN=dbhost.yourdomain.com" \
+  -o server_cert.csr -g 2048 -Z SHA256
+
+certutil -C -d "sql:root_ca.db/" -c root_ca -i server_cert.csr \
+  -o server_cert.der -m <replaceable>5433</replaceable> \
+  --keyUsage keyEncipherment,dataEncipherment,digitalSignature \
+  --nsCertType sslServer -Z SHA256
+
+certutil -A -d "sql:server_cert.db/" -n root_ca -t CTu,CTu,CTu -a -i root_ca.pem
+certutil -A -d "sql:server_cert.db/" -n server_cert -t CTu,CTu,CTu -i server_cert.der
+</programlisting>
+    The server certificate is loaded into the certificate database as well as
+    the CA certificate in order to provide the chain of certificates.
+   </para>
+  </sect2>
+
  </sect1>
 
  <sect1 id="gssapi-enc">
-- 
2.21.1 (Apple Git-122.3)

From bd593ad86cf4d4fca3fe4a89c1b89832bedb9805 Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Mon, 8 Feb 2021 23:52:39 +0100
Subject: [PATCH v29 4/9] nss: pg_strong_random support

This adds support for using the RNG in libnss as a backend for
pg_strong_random.
---
 src/port/pg_strong_random.c | 50 ++++++++++++++++++++++++++++++++++++-
 1 file changed, 49 insertions(+), 1 deletion(-)

diff --git a/src/port/pg_strong_random.c b/src/port/pg_strong_random.c
index 07f24c0089..40de237628 100644
--- a/src/port/pg_strong_random.c
+++ b/src/port/pg_strong_random.c
@@ -137,7 +137,55 @@ pg_strong_random(void *buf, size_t len)
 	return false;
 }
 
-#else							/* not USE_OPENSSL or WIN32 */
+#elif defined(USE_NSS)
+
+#define pg_BITS_PER_BYTE BITS_PER_BYTE
+#undef BITS_PER_BYTE
+#define NO_NSPR_10_SUPPORT
+#include <nss/nss.h>
+#include <nss/pk11pub.h>
+#if defined(BITS_PER_BYTE)
+#if BITS_PER_BYTE != pg_BITS_PER_BYTE
+#error "incompatible byte widths between NSPR and postgres"
+#endif
+#else
+#define BITS_PER_BYTE pg_BITS_PER_BYTE
+#endif
+#undef pg_BITS_PER_BYTE
+
+void
+pg_strong_random_init(void)
+{
+	/* No initialization needed on NSS */
+}
+
+bool
+pg_strong_random(void *buf, size_t len)
+{
+	NSSInitParameters params;
+	NSSInitContext *nss_context;
+	SECStatus	status;
+
+	memset(&params, 0, sizeof(params));
+	params.length = sizeof(params);
+	nss_context = NSS_InitContext("", "", "", "", &params,
+								  NSS_INIT_READONLY | NSS_INIT_NOCERTDB |
+								  NSS_INIT_NOMODDB | NSS_INIT_FORCEOPEN |
+								  NSS_INIT_NOROOTINIT | NSS_INIT_PK11RELOAD);
+
+	if (!nss_context)
+		return false;
+
+	status = PK11_GenerateRandom(buf, len);
+	NSS_ShutdownContext(nss_context);
+
+	if (status == SECSuccess)
+		return true;
+
+	return false;
+}
+
+#else							/* not USE_OPENSSL, USE_NSS or WIN32 */
 
 /*
  * Without OpenSSL or Win32 support, just read /dev/urandom ourselves.
-- 
2.21.1 (Apple Git-122.3)

From 1ed0d6d2c20d8504090d8d166e6ca20491c108ea Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Mon, 8 Feb 2021 23:52:37 +0100
Subject: [PATCH v29 3/9] nss: Add NSS specific tests

This adds the SSL/Backend/NSS which implements the setup and teardown
required as well as adds the NSS configuration to the existing tests.

The OpenSSL testfiles are reused by repackaging them into NSS databases
in order for the tests to be cross-library. Additional testfiles are
generated by using only the NSS toolchain as well as rudimentary tests
using these.
---
 src/test/ssl/Makefile                 | 244 ++++++++++++++++++
 src/test/ssl/t/001_ssltests.pl        | 342 +++++++++++++++++---------
 src/test/ssl/t/002_scram.pl           |  31 ++-
 src/test/ssl/t/SSL/Backend/NSS.pm     |  61 +++++
 src/test/ssl/t/SSL/Backend/OpenSSL.pm |  19 +-
 src/test/ssl/t/SSL/Server.pm          |  48 +---
 6 files changed, 582 insertions(+), 163 deletions(-)
 create mode 100644 src/test/ssl/t/SSL/Backend/NSS.pm

diff --git a/src/test/ssl/Makefile b/src/test/ssl/Makefile
index 4b53fdf6c0..8d4afa9dd0 100644
--- a/src/test/ssl/Makefile
+++ b/src/test/ssl/Makefile
@@ -33,6 +33,36 @@ SSLFILES := $(CERTIFICATES:%=ssl/%.key) $(CERTIFICATES:%=ssl/%.crt) \
 SSLDIRS := ssl/client-crldir ssl/server-crldir \
 	ssl/root+client-crldir ssl/root+server-crldir
 
+# Even though we in practice could get away with far fewer NSS databases, they
+# are generated to mimic the setup for the OpenSSL tests in order to ensure
+# we isolate the same behavior between the backends. The database name should
+# contain the files included for easier test suite code reading.
+NSSFILES := ssl/nss/client_ca.crt.db \
+	ssl/nss/server_ca.crt.db \
+	ssl/nss/root+server_ca.crt.db \
+	ssl/nss/root+client_ca.crt.db \
+	ssl/nss/client.crt__client.key.db \
+	ssl/nss/client-revoked.crt__client-revoked.key.db \
+	ssl/nss/server-cn-only.crt__server-password.key.db \
+	ssl/nss/server-cn-only.crt__server-cn-only.key.db \
+	ssl/nss/root.crl \
+	ssl/nss/server.crl \
+	ssl/nss/client.crl \
+	ssl/nss/server-multiple-alt-names.crt__server-multiple-alt-names.key.db \
+	ssl/nss/server-single-alt-name.crt__server-single-alt-name.key.db \
+	ssl/nss/server-cn-and-alt-names.crt__server-cn-and-alt-names.key.db \
+	ssl/nss/server-no-names.crt__server-no-names.key.db \
+	ssl/nss/server-revoked.crt__server-revoked.key.db \
+	ssl/nss/root+client.crl \
+	ssl/nss/client+client_ca.crt__client.key.db \
+	ssl/nss/client.crt__client-encrypted-pem.key.db \
+	ssl/nss/root+server_ca.crt__server.crl.db \
+	ssl/nss/root+server_ca.crt__root+server.crl.db \
+	ssl/nss/root+server_ca.crt__root+server.crldir.db \
+	ssl/nss/native_ca-root.db \
+	ssl/nss/native_server-root.db \
+	ssl/nss/native_client-root.db
+
 # This target re-generates all the key and certificate files. Usually we just
 # use the ones that are committed to the tree without rebuilding them.
 #
@@ -40,6 +70,10 @@ SSLDIRS := ssl/client-crldir ssl/server-crldir \
 #
 sslfiles: $(SSLFILES) $(SSLDIRS)
 
+# Generate NSS certificate databases corresponding to the OpenSSL certificates.
+# This target will fail unless preceded by nssfiles-clean.
+nssfiles: $(NSSFILES)
+
 # OpenSSL requires a directory to put all generated certificates in. We don't
 # use this for anything, but we need a location.
 ssl/new_certs_dir:
@@ -67,6 +101,35 @@ ssl/%_ca.crt: ssl/%_ca.key %_ca.config ssl/root_ca.crt ssl/new_certs_dir
 	rm ssl/temp_ca.crt ssl/temp_ca_signed.crt
 	echo "01" > ssl/$*_ca.srl
 
+ssl/nss/%_ca.crt.db: ssl/%_ca.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n $*_ca.crt -i ssl/$*_ca.crt -t "CT,C,C"
+
+ssl/nss/root+server_ca.crt__server.crl.db: ssl/root+server_ca.crt ssl/nss/server.crl
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	crlutil -I -i ssl/nss/server.crl -d $@ -B
+
+ssl/nss/root+server_ca.crt__root+server.crl.db: ssl/root+server_ca.crt ssl/nss/root.crl ssl/nss/server.crl
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	crlutil -I -i ssl/nss/root.crl -d $@ -B
+	crlutil -I -i ssl/nss/server.crl -d $@ -B
+
+ssl/nss/root+server_ca.crt__root+server.crldir.db: ssl/root+server_ca.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	crlutil -I -i ssl/nss/root.crl -d $@ -B
+	for c in $(shell ls ssl/root+server-crldir) ; do \
+		echo $${c} ; \
+		openssl crl -in ssl/root+server-crldir/$${c} -outform der -out ssl/nss/$${c} ; \
+		crlutil -I -i ssl/nss/$${c} -d $@ -B ; \
+	done
+
 # Server certificates, signed by server CA:
 ssl/server-%.crt: ssl/server-%.key ssl/server_ca.crt server-%.config
 	openssl req -new -key ssl/server-$*.key -out ssl/server-$*.csr -config server-$*.config
@@ -80,6 +143,86 @@ ssl/server-ss.crt: ssl/server-cn-only.key ssl/server-cn-only.crt server-cn-only.
 	openssl x509 -req -days 10000 -in ssl/server-ss.csr -signkey ssl/server-cn-only.key -out ssl/server-ss.crt  -extensions v3_req -extfile server-cn-only.config
 	rm ssl/server-ss.csr
 
+# pk12util won't preserve the password when importing the password protected
+# key, the password must be set on the database *before* importing it as the
+# password in the pkcs12 envelope will be dropped.
+ssl/nss/server-cn-only.crt__server-password.key.db: ssl/server-cn-only.crt
+	$(MKDIR_P) $@
+	echo "secret1" > password.txt
+	certutil -d "sql:$@" -N -f password.txt
+	certutil -d "sql:$@" -A -n ssl/server-cn-only.crt -i ssl/server-cn-only.crt -t "CT,C,C" -f password.txt
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C" -f password.txt
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C" -f password.txt
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C" -f password.txt
+	openssl pkcs12 -export -out ssl/nss/server-password.pfx -inkey ssl/server-password.key -in ssl/server-cn-only.crt -certfile ssl/server_ca.crt -passin 'pass:secret1' -passout 'pass:secret1'
+	pk12util -i ssl/nss/server-password.pfx -d "sql:$@" -W 'secret1' -K 'secret1'
+
+ssl/nss/server-cn-only.crt__server-cn-only.key.db: ssl/server-cn-only.crt ssl/server-cn-only.key
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-cn-only.crt -i ssl/server-cn-only.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-cn-only.pfx -inkey ssl/server-cn-only.key -in ssl/server-cn-only.crt -certfile ssl/server_ca.crt -passout pass:
+	pk12util -i ssl/nss/server-cn-only.pfx -d "sql:$@" -W ''
+
+ssl/nss/server-cn-only.crt__server-cn-only.key.crldir.db: ssl/nss/server-cn-only.crt__server-cn-only.key.db
+	for c in $(shell ls ssl/root+client-crldir) ; do \
+		echo $${c} ; \
+		openssl crl -in ssl/root+client-crldir/$${c} -outform der -out ssl/nss/$${c} ; \
+		crlutil -I -i ssl/nss/$${c} -d $@ -B ; \
+	done
+
+ssl/nss/server-multiple-alt-names.crt__server-multiple-alt-names.key.db: ssl/server-multiple-alt-names.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-multiple-alt-names.crt -i ssl/server-multiple-alt-names.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-multiple-alt-names.pfx -inkey ssl/server-multiple-alt-names.key -in ssl/server-multiple-alt-names.crt -certfile ssl/server-multiple-alt-names.crt -passout pass:
+	pk12util -i ssl/nss/server-multiple-alt-names.pfx -d "sql:$@" -W ''
+
+ssl/nss/server-single-alt-name.crt__server-single-alt-name.key.db: ssl/server-single-alt-name.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-single-alt-name.crt -i ssl/server-single-alt-name.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-single-alt-name.pfx -inkey ssl/server-single-alt-name.key -in ssl/server-single-alt-name.crt -certfile ssl/server-single-alt-name.crt -passout pass:
+	pk12util -i ssl/nss/server-single-alt-name.pfx -d "sql:$@" -W ''
+
+ssl/nss/server-cn-and-alt-names.crt__server-cn-and-alt-names.key.db: ssl/server-cn-and-alt-names.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-cn-and-alt-names.crt -i ssl/server-cn-and-alt-names.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-cn-and-alt-names.pfx -inkey ssl/server-cn-and-alt-names.key -in ssl/server-cn-and-alt-names.crt -certfile ssl/server-cn-and-alt-names.crt -passout pass:
+	pk12util -i ssl/nss/server-cn-and-alt-names.pfx -d $@ -W ''
+
+ssl/nss/server-no-names.crt__server-no-names.key.db: ssl/server-no-names.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-no-names.crt -i ssl/server-no-names.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-no-names.pfx -inkey ssl/server-no-names.key -in ssl/server-no-names.crt -certfile ssl/server-no-names.crt -passout pass:
+	pk12util -i ssl/nss/server-no-names.pfx -d "sql:$@" -W ''
+
+ssl/nss/server-revoked.crt__server-revoked.key.db: ssl/server-revoked.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-revoked.crt -i ssl/server-revoked.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-revoked.pfx -inkey ssl/server-revoked.key -in ssl/server-revoked.crt -certfile ssl/server-revoked.crt -passout pass:
+	pk12util -i ssl/nss/server-revoked.pfx -d "sql:$@" -W ''
+
 # Password-protected version of server-cn-only.key
 ssl/server-password.key: ssl/server-cn-only.key
 	openssl rsa -aes256 -in $< -out $@ -passout 'pass:secret1'
@@ -91,6 +234,27 @@ ssl/client.crt: ssl/client.key ssl/client_ca.crt
 	openssl x509 -in ssl/temp.crt -out ssl/client.crt # to keep just the PEM cert
 	rm ssl/client.csr ssl/temp.crt
 
+# Client certificate, signed by client CA
+ssl/nss/client.crt__client.key.db: ssl/client.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/client.crt -i ssl/client.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root+client_ca.crt -i ssl/root+client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client.pfx -inkey ssl/client.key -in ssl/client.crt -certfile ssl/client_ca.crt -passout pass:
+	pk12util -i ssl/nss/client.pfx -d "sql:$@" -W ''
+
+# Client certificate with encrypted key, signed by client CA
+ssl/nss/client.crt__client-encrypted-pem.key.db: ssl/client.crt
+	$(MKDIR_P) $@
+	echo 'dUmmyP^#+' > $@.pass
+	certutil -d "sql:$@" -N -f $@.pass
+	certutil -d "sql:$@" -A -f $@.pass -n ssl/client.crt -i ssl/client.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -f $@.pass -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -f $@.pass -n root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client-encrypted-pem.pfx -inkey ssl/client-encrypted-pem.key -in ssl/client.crt -certfile ssl/client_ca.crt -passin pass:'dUmmyP^#+' -passout pass:'dUmmyP^#+'
+	pk12util -i ssl/nss/client-encrypted-pem.pfx -d "sql:$@" -W 'dUmmyP^#+' -k $@.pass
+
 # Another client certificate, signed by the client CA. This one is revoked.
 ssl/client-revoked.crt: ssl/client-revoked.key ssl/client_ca.crt client.config
 	openssl req -new -key ssl/client-revoked.key -out ssl/client-revoked.csr -config client.config
@@ -98,6 +262,14 @@ ssl/client-revoked.crt: ssl/client-revoked.key ssl/client_ca.crt client.config
 	openssl x509 -in ssl/temp.crt -out ssl/client-revoked.crt # to keep just the PEM cert
 	rm ssl/client-revoked.csr ssl/temp.crt
 
+ssl/nss/client-revoked.crt__client-revoked.key.db: ssl/client-revoked.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/client-revoked.crt -i ssl/client-revoked.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client-revoked.pfx -inkey ssl/client-revoked.key -in ssl/client-revoked.crt -certfile ssl/client_ca.crt -passout pass:
+	pk12util -i ssl/nss/client-revoked.pfx -d "sql:$@" -W ''
+
 # Convert the key to DER, to test our behaviour there too
 ssl/client-der.key: ssl/client.key
 	openssl rsa -in ssl/client.key -outform DER -out ssl/client-der.key
@@ -130,19 +302,40 @@ ssl/root+client_ca.crt: ssl/root_ca.crt ssl/client_ca.crt
 ssl/client+client_ca.crt: ssl/client.crt ssl/client_ca.crt
 	cat $^ > $@
 
+# Client certificate, signed by client CA
+ssl/nss/client+client_ca.crt__client.key.db: ssl/client+client_ca.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/client+client_ca.crt -i ssl/client+client_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n ssl/root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client.pfx -inkey ssl/client.key -in ssl/client.crt -certfile ssl/client_ca.crt -passout pass:
+	pk12util -i ssl/nss/client.pfx -d "sql:$@" -W ''
+
 #### CRLs
 
 ssl/client.crl: ssl/client-revoked.crt
 	openssl ca -config cas.config -name client_ca -revoke ssl/client-revoked.crt
 	openssl ca -config cas.config -name client_ca -gencrl -out ssl/client.crl
 
+ssl/nss/client.crl: ssl/client.crl
+	openssl crl -in $^ -outform der -out $@
+
 ssl/server.crl: ssl/server-revoked.crt
 	openssl ca -config cas.config -name server_ca -revoke ssl/server-revoked.crt
 	openssl ca -config cas.config -name server_ca -gencrl -out ssl/server.crl
 
+ssl/nss/server.crl: ssl/server.crl
+	openssl crl -in $^ -outform der -out $@
+
 ssl/root.crl: ssl/root_ca.crt
 	openssl ca -config cas.config -name root_ca -gencrl -out ssl/root.crl
 
+ssl/nss/root.crl: ssl/root.crl
+	openssl crl -in $^ -outform der -out $@
+
+ssl/nss/root+client.crl: ssl/root+client.crl
+	openssl crl -in $^ -outform der -out $@
+
 # If a CRL is used, OpenSSL requires a CRL file for *all* the CAs in the
 # chain, even if some of them are empty.
 ssl/root+server.crl: ssl/root.crl ssl/server.crl
@@ -168,14 +361,65 @@ ssl/client-crldir: ssl/client.crl
 	mkdir ssl/client-crldir
 	cp ssl/client.crl ssl/client-crldir/`openssl crl -hash -noout -in ssl/client.crl`.r0
 
+#### NSS specific certificates and keys
+
+ssl/nss/native_ca-%.db:
+	$(MKDIR_P) ssl/nss/native_ca-$*.db
+	certutil -N -d "sql:ssl/nss/native_ca-$*.db/" --empty-password
+	echo y > nss_ca_params.txt
+	echo 10 >> nss_ca_params.txt
+	echo y >> nss_ca_params.txt
+	cat nss_ca_params.txt | certutil -S -d "sql:ssl/nss/native_ca-$*.db/" -n ca-$* \
+	-s "CN=Test CA for PostgreSQL SSL regression tests,OU=PostgreSQL test suite" \
+	-x -k rsa -g 2048 -m 5432 -t CTu,CTu,CTu \
+	--keyUsage certSigning -2 --nsCertType sslCA,smimeCA,objectSigningCA \
+	-z Makefile -Z SHA256
+	rm nss_ca_params.txt
+
+ssl/nss/native_ca-%.pem: ssl/nss/native_ca-%.db
+	certutil -L -d "sql:ssl/nss/native_ca-$*.db/" -n ca-$* -a > ssl/nss/native_ca-$*.pem
+
+# Create and sign a server certificate
+ssl/nss/native_server-%.db: ssl/nss/native_ca-%.pem
+	$(MKDIR_P) ssl/nss/native_server-$*.db
+	certutil -N -d "sql:ssl/nss/native_server-$*.db/" --empty-password
+	certutil -R -d "sql:ssl/nss/native_server-$*.db/" \
+		-s "CN=common-name.pg-ssltest.test,OU=PostgreSQL test suite" \
+		-o ssl/nss/native_server-$*.csr -g 2048 -Z SHA256 -z Makefile
+	echo 1 > nss_server_params.txt
+	echo 9 >> nss_server_params.txt
+	cat nss_server_params.txt | certutil -C -d "sql:ssl/nss/native_ca-$*.db/" -c ca-root -i ssl/nss/native_server-$*.csr \
+		-o ssl/nss/native_server_$*.der -m 5433 --keyUsage dataEncipherment,digitalSignature,keyEncipherment \
+		--nsCertType sslServer --certVersion 1 -Z SHA256
+	certutil -A -d "sql:ssl/nss/native_server-$*.db/" -n ca-$* -t CTu,CTu,CTu -a -i ssl/nss/native_ca-$*.pem
+	certutil -A -d "sql:ssl/nss/native_server-$*.db/" -n ssl/native_server-$*.crt -t CTu,CTu,CTu -i ssl/nss/native_server_$*.der
+	rm nss_server_params.txt
+
+# Create and sign a client certificate
+ssl/nss/native_client-%.db: ssl/nss/native_ca-%.pem
+	$(MKDIR_P) ssl/nss/native_client-$*.db
+	certutil -N -d "sql:ssl/nss/native_client-$*.db/" --empty-password
+	certutil -R -d "sql:ssl/nss/native_client-$*.db/" -s "CN=ssltestuser,OU=PostgreSQL test suite" \
+		-o ssl/nss/native_client-$*.csr -g 2048 -Z SHA256 -z Makefile
+	certutil -C -d "sql:ssl/nss/native_ca-$*.db/" -c ca-$* -i ssl/nss/native_client-$*.csr -o ssl/nss/native_client-$*.der \
+		-m 5434 --keyUsage keyEncipherment,dataEncipherment,digitalSignature --nsCertType sslClient \
+		--certVersion 1 -Z SHA256
+	certutil -A -d "sql:ssl/nss/native_client-$*.db" -n ca-$* -t CTu,CTu,CTu -a -i ssl/nss/native_ca-$*.pem
+	certutil -A -d "sql:ssl/nss/native_client-$*.db" -n native_client-$* -t CTu,CTu,CTu -i ssl/nss/native_client-$*.der
+
 .PHONY: sslfiles-clean
 sslfiles-clean:
 	rm -f $(SSLFILES) ssl/client_ca.srl ssl/server_ca.srl ssl/client_ca-certindex* ssl/server_ca-certindex* ssl/root_ca-certindex* ssl/root_ca.srl ssl/temp_ca.crt ssl/temp_ca_signed.crt
 	rm -rf $(SSLDIRS)
 
+.PHONY: nssfiles-clean
+nssfiles-clean:
+	rm -rf ssl/nss
+
 clean distclean maintainer-clean:
 	rm -rf tmp_check
 	rm -rf ssl/*.old ssl/new_certs_dir ssl/client*_tmp.key
+	rm -rf ssl/nss
 
 # Doesn't depend on $(SSLFILES) because we don't rebuild them by default
 check:
diff --git a/src/test/ssl/t/001_ssltests.pl b/src/test/ssl/t/001_ssltests.pl
index 30b68bddbe..25efe791f3 100644
--- a/src/test/ssl/t/001_ssltests.pl
+++ b/src/test/ssl/t/001_ssltests.pl
@@ -9,13 +9,22 @@ use lib $FindBin::RealBin;
 
 use SSL::Server;
 
-if ($ENV{with_ssl} ne 'openssl')
+my $openssl;
+my $nss;
+
+if ($ENV{with_ssl} eq 'openssl')
+{
+	$openssl = 1;
+	plan tests => 103;
+}
+elsif ($ENV{with_ssl} eq 'nss')
 {
-	plan skip_all => 'OpenSSL not supported by this build';
+	$nss = 1;
+	plan tests => 104;
 }
 else
 {
-	plan tests => 100;
+	plan skip_all => 'SSL not supported by this build';
 }
 
 #### Some configuration
@@ -51,19 +60,70 @@ configure_test_server_for_ssl($node, $SERVERHOSTADDR, $SERVERHOSTCIDR,
 
 note "testing password-protected keys";
 
-set_server_cert($node, 'server-cn-only', 'root+client_ca',
-				   'server-password', 'echo wrongpassword');
-command_fails(
-	[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
-	'restart fails with password-protected key file with wrong password');
-$node->_update_pid(0);
+# Since the passphrase callbacks operate at different stages in OpenSSL and
+# NSS we have two separate blocks for them
+SKIP:
+{
+	skip "Certificate passphrases aren't checked on server restart in NSS", 2
+	  if ($nss);
+
+	switch_server_cert($node,
+		certfile => 'server-cn-only',
+		cafile => 'root+client_ca',
+		keyfile => 'server-password',
+		nssdatabase => 'server-cn-only.crt__server-password.key.db',
+		passphrase_cmd => 'echo wrongpassword',
+		restart => 'no' );
+
+	command_fails(
+		[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
+		'restart fails with password-protected key file with wrong password');
+	$node->_update_pid(0);
+
+	switch_server_cert($node,
+		certfile => 'server-cn-only',
+		cafile => 'root+client_ca',
+		keyfile => 'server-password',
+		nssdatabase => 'server-cn-only.crt__server-password.key.db',
+		passphrase_cmd => 'echo secret1',
+		restart => 'no');
+
+	command_ok(
+		[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
+		'restart succeeds with password-protected key file');
+	$node->_update_pid(1);
+}
 
-set_server_cert($node, 'server-cn-only', 'root+client_ca',
-				'server-password', 'echo secret1');
-command_ok(
-	[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
-	'restart succeeds with password-protected key file');
-$node->_update_pid(1);
+SKIP:
+{
+	skip "Certificate passphrases are checked on connection in NSS", 3
+	  if ($openssl);
+
+	switch_server_cert($node,
+		certfile => 'server-cn-only',
+		cafile => 'root+client_ca',
+		keyfile => 'server-password',
+		nssdatabase => 'server-cn-only.crt__server-password.key.db',
+		passphrase_cmd => 'echo wrongpassword');
+
+	test_connect_fails(
+		"user=ssltestuser dbname=trustdb sslcert=invalid hostaddr=$SERVERHOSTADDR host=common-name.pg-ssltest.test",
+		"sslrootcert=invalid sslmode=require",
+		qr/\QSSL error\E/,
+		"connect to server with incorrect key password configured");
+
+	switch_server_cert($node,
+		certfile => 'server-cn-only',
+		cafile => 'root+client_ca',
+		keyfile => 'server-password',
+		nssdatabase => 'server-cn-only.crt__server-password.key.db',
+		passphrase_cmd => 'echo secret1');
+
+	test_connect_ok(
+		"user=ssltestuser dbname=trustdb sslcert=invalid hostaddr=$SERVERHOSTADDR host=common-name.pg-ssltest.test",
+		"sslrootcert=invalid sslmode=require",
+		"connect to server with correct key password configured");
+}
 
 # Test compatibility of SSL protocols.
 # TLSv1.1 is lower than TLSv1.2, so it won't work.
@@ -91,7 +151,7 @@ command_ok(
 
 note "running client tests";
 
-switch_server_cert($node, 'server-cn-only');
+switch_server_cert($node, certfile => 'server-cn-only', nssdatabase => 'server-cn-only.crt__server-cn-only.key.db');
 
 $common_connstr =
   "user=ssltestuser dbname=trustdb sslcert=invalid hostaddr=$SERVERHOSTADDR host=common-name.pg-ssltest.test";
@@ -111,95 +171,118 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"sslrootcert=invalid sslmode=verify-ca",
-	qr/root certificate file "invalid" does not exist/,
+	qr/root certificate file "invalid" does not exist|Peer's certificate issuer has been marked as not trusted by the user/,
 	"connect without server root cert sslmode=verify-ca");
 test_connect_fails(
 	$common_connstr,
 	"sslrootcert=invalid sslmode=verify-full",
-	qr/root certificate file "invalid" does not exist/,
+	qr/root certificate file "invalid" does not exist|Peer's certificate issuer has been marked as not trusted by the user/,
 	"connect without server root cert sslmode=verify-full");
 
 # Try with wrong root cert, should fail. (We're using the client CA as the
 # root, but the server's key is signed by the server CA.)
-test_connect_fails($common_connstr,
-	"sslrootcert=ssl/client_ca.crt sslmode=require",
-	qr/SSL error/, "connect with wrong server root cert sslmode=require");
-test_connect_fails($common_connstr,
-	"sslrootcert=ssl/client_ca.crt sslmode=verify-ca",
-	qr/SSL error/, "connect with wrong server root cert sslmode=verify-ca");
-test_connect_fails($common_connstr,
-	"sslrootcert=ssl/client_ca.crt sslmode=verify-full",
-	qr/SSL error/, "connect with wrong server root cert sslmode=verify-full");
-
-# Try with just the server CA's cert. This fails because the root file
-# must contain the whole chain up to the root CA.
-test_connect_fails($common_connstr,
-	"sslrootcert=ssl/server_ca.crt sslmode=verify-ca",
-	qr/SSL error/, "connect with server CA cert, without root CA");
+test_connect_fails(
+	$common_connstr,
+	"sslrootcert=ssl/client_ca.crt sslmode=require cert_database=ssl/nss/client_ca.crt.db",
+	qr/SSL error/,
+	"connect with wrong server root cert sslmode=require");
+test_connect_fails(
+	$common_connstr,
+	"sslrootcert=ssl/client_ca.crt sslmode=verify-ca cert_database=ssl/nss/client_ca.crt.db",
+	qr/SSL error/,
+	"connect with wrong server root cert sslmode=verify-ca");
+test_connect_fails(
+	$common_connstr,
+	"sslrootcert=ssl/client_ca.crt sslmode=verify-full cert_database=ssl/nss/client_ca.crt.db",
+	qr/SSL error/,
+	"connect with wrong server root cert sslmode=verify-full");
+
+SKIP:
+{
+	# NSS supports partial chain validation, so this test doesn't work there.
+	# This is similar to the OpenSSL option X509_V_FLAG_PARTIAL_CHAIN which
+	# we don't allow.
+	skip "NSS support partial chain validation", 2 if ($nss);
+	# Try with just the server CA's cert. This fails because the root file
+	# must contain the whole chain up to the root CA.
+	test_connect_fails($common_connstr,
+		"sslrootcert=ssl/server_ca.crt sslmode=verify-ca",
+		qr/SSL error/, "connect with server CA cert, without root CA");
+}
 
 # And finally, with the correct root cert.
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require cert_database=ssl/nss/root+server_ca.crt.db",
 	"connect with correct server CA cert file sslmode=require");
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca cert_database=ssl/nss/root+server_ca.crt.db",
 	"connect with correct server CA cert file sslmode=verify-ca");
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-full",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db",
 	"connect with correct server CA cert file sslmode=verify-full");
 
-# Test with cert root file that contains two certificates. The client should
-# be able to pick the right one, regardless of the order in the file.
-test_connect_ok(
-	$common_connstr,
-	"sslrootcert=ssl/both-cas-1.crt sslmode=verify-ca",
-	"cert root file that contains two certificates, order 1");
-test_connect_ok(
-	$common_connstr,
-	"sslrootcert=ssl/both-cas-2.crt sslmode=verify-ca",
-	"cert root file that contains two certificates, order 2");
+SKIP:
+{
+	skip "CA ordering is irrelevant in NSS databases", 2 if ($nss);
+
+	# Test with cert root file that contains two certificates. The client should
+	# be able to pick the right one, regardless of the order in the file.
+	test_connect_ok(
+		$common_connstr,
+		"sslrootcert=ssl/both-cas-1.crt sslmode=verify-ca",
+		"cert root file that contains two certificates, order 1");
 
+	# How about import the both-file into a database?
+	test_connect_ok(
+		$common_connstr,
+		"sslrootcert=ssl/both-cas-2.crt sslmode=verify-ca",
+		"cert root file that contains two certificates, order 2");
+}
 # CRL tests
 
 # Invalid CRL filename is the same as no CRL, succeeds
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=invalid",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=invalid cert_database=ssl/nss/root+server_ca.crt.db",
 	"sslcrl option with invalid file name");
 
-# A CRL belonging to a different CA is not accepted, fails
-test_connect_fails(
-	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/client.crl",
-	qr/SSL error/,
-	"CRL belonging to a different CA");
+SKIP:
+{
+	skip "CRL's are verified when adding to NSS database", 4 if ($nss);
+	# A CRL belonging to a different CA is not accepted, fails
+	test_connect_fails(
+		$common_connstr,
+		"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/client.crl",
+		qr/SSL error/,
+		"CRL belonging to a different CA");
 
-# The same for CRL directory
-test_connect_fails(
-	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrldir=ssl/client-crldir",
-	qr/SSL error/,
-	"directory CRL belonging to a different CA");
+	# The same for CRL directory
+	test_connect_fails(
+		$common_connstr,
+		"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrldir=ssl/client-crldir",
+		qr/SSL error/,
+		"directory CRL belonging to a different CA");
+}
 
 # With the correct CRL, succeeds (this cert is not revoked)
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/root+server.crl",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/root+server.crl cert_database=ssl/nss/root+server_ca.crt__root+server.crl.db",
 	"CRL with a non-revoked cert");
 
 # The same for CRL directory
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrldir=ssl/root+server-crldir",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrldir=ssl/root+server-crldir cert_database=ssl/nss/root+server_ca.crt__root+server.crldir.db",
 	"directory CRL with a non-revoked cert");
 
 # Check that connecting with verify-full fails, when the hostname doesn't
 # match the hostname in the server's certificate.
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -212,14 +295,14 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"sslmode=verify-full host=wronghost.test",
-	qr/\Qserver certificate for "common-name.pg-ssltest.test" does not match host name "wronghost.test"\E/,
+	qr/\Qserver certificate for "common-name.pg-ssltest.test" does not match host name "wronghost.test"\E|requested domain name does not match the server's certificate/,
 	"mismatch between host name and server certificate sslmode=verify-full");
 
 # Test Subject Alternative Names.
-switch_server_cert($node, 'server-multiple-alt-names');
+switch_server_cert($node, certfile => 'server-multiple-alt-names', nssdatabase => 'server-multiple-alt-names.crt__server-multiple-alt-names.key.db');
 
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -237,20 +320,20 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"host=wronghost.alt-name.pg-ssltest.test",
-	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "wronghost.alt-name.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "wronghost.alt-name.pg-ssltest.test"\E|requested domain name does not match the server's certificate/,
 	"host name not matching with X.509 Subject Alternative Names");
 test_connect_fails(
 	$common_connstr,
 	"host=deep.subdomain.wildcard.pg-ssltest.test",
-	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E|requested domain name does not match the server's certificate/,
 	"host name not matching with X.509 Subject Alternative Names wildcard");
 
 # Test certificate with a single Subject Alternative Name. (this gives a
 # slightly different error message, that's all)
-switch_server_cert($node, 'server-single-alt-name');
+switch_server_cert($node, certfile => 'server-single-alt-name', nssdatabase => 'server-single-alt-name.crt__server-single-alt-name.key.db');
 
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -260,21 +343,21 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"host=wronghost.alt-name.pg-ssltest.test",
-	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "wronghost.alt-name.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "wronghost.alt-name.pg-ssltest.test"\E|requested domain name does not match the server's certificate/,
 	"host name not matching with a single X.509 Subject Alternative Name");
 test_connect_fails(
 	$common_connstr,
 	"host=deep.subdomain.wildcard.pg-ssltest.test",
-	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E|requested domain name does not match the server's certificate/,
 	"host name not matching with a single X.509 Subject Alternative Name wildcard"
 );
 
 # Test server certificate with a CN and SANs. Per RFCs 2818 and 6125, the CN
 # should be ignored when the certificate has both.
-switch_server_cert($node, 'server-cn-and-alt-names');
+switch_server_cert($node, certfile => 'server-cn-and-alt-names', nssdatabase => 'server-cn-and-alt-names.crt__server-cn-and-alt-names.key.db');
 
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -287,14 +370,14 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"host=common-name.pg-ssltest.test",
-	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 1 other name) does not match host name "common-name.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 1 other name) does not match host name "common-name.pg-ssltest.test"\E|requested domain name does not match the server's certificate/,
 	"certificate with both a CN and SANs ignores CN");
 
 # Finally, test a server certificate that has no CN or SANs. Of course, that's
 # not a very sensible certificate, but libpq should handle it gracefully.
-switch_server_cert($node, 'server-no-names');
+switch_server_cert($node, certfile => 'server-no-names', nssdatabase => 'server-no-names.crt__server-no-names.key.db');
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -303,11 +386,11 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"sslmode=verify-full host=common-name.pg-ssltest.test",
-	qr/could not get server's host name from server certificate/,
+	qr/could not get server's host name from server certificate|requested domain name does not match the server's certificate./,
 	"server certificate without CN or SANs sslmode=verify-full");
 
 # Test that the CRL works
-switch_server_cert($node, 'server-revoked');
+switch_server_cert($node, certfile => 'server-revoked', nssdatabase => 'server-revoked.crt__server-revoked.key.db');
 
 $common_connstr =
   "user=ssltestuser dbname=trustdb sslcert=invalid hostaddr=$SERVERHOSTADDR host=common-name.pg-ssltest.test";
@@ -315,16 +398,16 @@ $common_connstr =
 # Without the CRL, succeeds. With it, fails.
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca cert_database=ssl/nss/root+server_ca.crt.db",
 	"connects without client-side CRL");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/root+server.crl",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/server.crl cert_database=ssl/nss/root+server_ca.crt__server.crl.db",
 	qr/SSL error/,
 	"does not connect with client-side CRL file");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrldir=ssl/root+server-crldir",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrldir=ssl/root+server-crldir cert_database=ssl/nss/root+server_ca.crt__root+server.crldir.db",
 	qr/SSL error/,
 	"does not connect with client-side CRL directory");
 
@@ -345,32 +428,50 @@ command_like(
 # Test min/max SSL protocol versions.
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.2",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.2 cert_database=ssl/nss/root+server_ca.crt.db",
 	"connection success with correct range of TLS protocol versions");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.1",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.1 cert_database=ssl/nss/root+server_ca.crt.db",
 	qr/invalid SSL protocol version range/,
 	"connection failure with incorrect range of TLS protocol versions");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=incorrect_tls",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=incorrect_tls cert_database=ssl/nss/root+server_ca.crt.db",
 	qr/invalid ssl_min_protocol_version value/,
 	"connection failure with an incorrect SSL protocol minimum bound");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_max_protocol_version=incorrect_tls",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_max_protocol_version=incorrect_tls cert_database=ssl/nss/root+server_ca.crt.db",
 	qr/invalid ssl_max_protocol_version value/,
 	"connection failure with an incorrect SSL protocol maximum bound");
 
+# tests of NSS generated certificates/keys
+SKIP:
+{
+	skip "NSS specific tests",            1 if ($openssl);
+
+	switch_server_cert($node, certfile => 'native_server-root', cafile => 'native_ca-root', nssdatabase => 'native_server-root.db');
+	$common_connstr =
+	  "user=ssltestuser dbname=trustdb hostaddr=$SERVERHOSTADDR host=common-name.pg-ssltest.test";
+
+	test_connect_ok(
+		$common_connstr,
+		"sslmode=require user=ssltestuser",
+		"NSS generated certificates"
+	);
+}
+
 ### Server-side tests.
 ###
 ### Test certificate authorization.
 
+switch_server_cert($node, certfile => 'server-revoked', nssdatabase => 'server-revoked.crt__server-revoked.key.db');
+
 note "running server tests";
 
 $common_connstr =
-  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR";
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client.crt__client.key.db";
 
 # no client cert
 test_connect_fails(
@@ -386,32 +487,43 @@ test_connect_ok(
 	"certificate authorization succeeds with correct client cert in PEM format"
 );
 
-# correct client cert in unencrypted DER
-test_connect_ok(
-	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-der_tmp.key",
-	"certificate authorization succeeds with correct client cert in DER format"
-);
+$common_connstr =
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR";
+
+SKIP:
+{
+	skip "NSS database not implemented in the Makefile", 1 if ($nss);
+	# correct client cert in unencrypted DER
+	test_connect_ok(
+		$common_connstr,
+		"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-der_tmp.key",
+		"certificate authorization succeeds with correct client cert in DER format"
+	);
+}
 
 # correct client cert in encrypted PEM
 test_connect_ok(
 	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='dUmmyP^#+'",
+	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='dUmmyP^#+' cert_database=ssl/nss/client.crt__client-encrypted-pem.key.db",
 	"certificate authorization succeeds with correct client cert in encrypted PEM format"
 );
 
-# correct client cert in encrypted DER
-test_connect_ok(
-	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-der_tmp.key sslpassword='dUmmyP^#+'",
-	"certificate authorization succeeds with correct client cert in encrypted DER format"
-);
+SKIP:
+{
+	skip "NSS database not implemented in the Makefile", 1 if ($nss);
+	# correct client cert in encrypted DER
+	test_connect_ok(
+		$common_connstr,
+		"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-der_tmp.key sslpassword='dUmmyP^#+'",
+		"certificate authorization succeeds with correct client cert in encrypted DER format"
+	);
+}
 
 # correct client cert in encrypted PEM with wrong password
 test_connect_fails(
 	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='wrong'",
-	qr!\Qprivate key file "ssl/client-encrypted-pem_tmp.key": bad decrypt\E!,
+	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='wrong' cert_database=ssl/nss/client.crt__client-encrypted-pem.key.db",
+	qr!connection requires a valid client certificate|\Qprivate key file "ssl/client-encrypted-pem_tmp.key": bad decrypt\E!,
 	"certificate authorization fails with correct client cert and wrong password in encrypted PEM format"
 );
 
@@ -451,18 +563,19 @@ command_like(
 		'-P',
 		'null=_null_',
 		'-d',
-		"$common_connstr user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client_tmp.key",
+		"$common_connstr user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client_tmp.key cert_database=ssl/nss/client.crt__client.key.db",
 		'-c',
 		"SELECT * FROM pg_stat_ssl WHERE pid = pg_backend_pid()"
 	],
 	qr{^pid,ssl,version,cipher,bits,compression,client_dn,client_serial,issuer_dn\r?\n
-				^\d+,t,TLSv[\d.]+,[\w-]+,\d+,f,/CN=ssltestuser,1,\Q/CN=Test CA for PostgreSQL SSL regression test client certs\E\r?$}mx,
+				^\d+,t,TLSv[\d.]+,[\w-]+,\d+,f,/?CN=ssltestuser,1,/?\QCN=Test CA for PostgreSQL SSL regression test client certs\E\r?$}mx,
 	'pg_stat_ssl with client certificate');
 
 # client key with wrong permissions
 SKIP:
 {
 	skip "Permissions check not enforced on Windows", 2 if ($windows_os);
+	skip "Key not on filesystem with NSS",            2 if ($nss);
 
 	test_connect_fails(
 		$common_connstr,
@@ -475,10 +588,13 @@ SKIP:
 test_connect_fails(
 	$common_connstr,
 	"user=anotheruser sslcert=ssl/client.crt sslkey=ssl/client_tmp.key",
-	qr/certificate authentication failed for user "anotheruser"/,
+	qr/unable to verify certificate|certificate authentication failed for user "anotheruser"/,
 	"certificate authorization fails with client cert belonging to another user"
 );
 
+$common_connstr =
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client-revoked.crt__client-revoked.key.db";
+
 # revoked client cert
 test_connect_fails(
 	$common_connstr,
@@ -490,7 +606,7 @@ test_connect_fails(
 # works, iff username matches Common Name
 # fails, iff username doesn't match Common Name.
 $common_connstr =
-  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=verifydb hostaddr=$SERVERHOSTADDR";
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=verifydb hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client.crt__client.key.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -514,24 +630,28 @@ test_connect_ok(
 );
 
 # intermediate client_ca.crt is provided by client, and isn't in server's ssl_ca_file
-switch_server_cert($node, 'server-cn-only', 'root_ca');
+switch_server_cert($node, certfile => 'server-cn-only', cafile => 'root_ca', nssdatabase => 'server-cn-only.crt__server-cn-only.key.db');
 $common_connstr =
-  "user=ssltestuser dbname=certdb sslkey=ssl/client_tmp.key sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR";
+  "user=ssltestuser dbname=certdb sslkey=ssl/client_tmp.key sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client+client_ca.crt__client.key.db";
 
 test_connect_ok(
 	$common_connstr,
 	"sslmode=require sslcert=ssl/client+client_ca.crt",
 	"intermediate client certificate is provided by client");
-test_connect_fails($common_connstr, "sslmode=require sslcert=ssl/client.crt",
-	qr/SSL error/, "intermediate client certificate is missing");
+
+test_connect_fails(
+	$common_connstr,
+	"sslmode=require sslcert=ssl/client.crt",
+	qr/connection requires a valid client certificate|SSL error/,
+	"intermediate client certificate is missing");
 
 # test server-side CRL directory
-switch_server_cert($node, 'server-cn-only', undef, undef, 'root+client-crldir');
+switch_server_cert($node, certfile => 'server-cn-only', crldir => 'root+client-crldir', nssdatabase => 'server-cn-only.crt__server-cn-only.key.crldir.db');
 
 # revoked client cert
 test_connect_fails(
 	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client-revoked.crt sslkey=ssl/client-revoked_tmp.key",
+	"user=ssltestuser sslcert=ssl/client-revoked.crt sslkey=ssl/client-revoked_tmp.key cert_database=ssl/nss/client-revoked.crt__client-revoked.key.db",
 	qr/SSL error/,
 	"certificate authorization fails with revoked client cert with server-side CRL directory");
 
diff --git a/src/test/ssl/t/002_scram.pl b/src/test/ssl/t/002_scram.pl
index 3383b3e531..801c945e88 100644
--- a/src/test/ssl/t/002_scram.pl
+++ b/src/test/ssl/t/002_scram.pl
@@ -13,7 +13,26 @@ use lib $FindBin::RealBin;
 
 use SSL::Server;
 
-if ($ENV{with_ssl} ne 'openssl')
+my $openssl;
+my $nss;
+
+my $supports_tls_server_end_point;
+
+if ($ENV{with_ssl} eq 'openssl')
+{
+	$openssl = 1;
+	# Determine whether build supports tls-server-end-point.
+	$supports_tls_server_end_point =
+		check_pg_config("#define HAVE_X509_GET_SIGNATURE_NID 1");
+	plan tests => $supports_tls_server_end_point ? 9 : 10;
+}
+elsif ($ENV{with_ssl} eq 'nss')
+{
+	$nss = 1;
+	$supports_tls_server_end_point = 1;
+	plan tests => 9;
+}
+else
 {
 	plan skip_all => 'SSL not supported by this build';
 }
@@ -23,12 +42,6 @@ my $SERVERHOSTADDR = '127.0.0.1';
 # This is the pattern to use in pg_hba.conf to match incoming connections.
 my $SERVERHOSTCIDR = '127.0.0.1/32';
 
-# Determine whether build supports tls-server-end-point.
-my $supports_tls_server_end_point =
-  check_pg_config("#define HAVE_X509_GET_SIGNATURE_NID 1");
-
-my $number_of_tests = $supports_tls_server_end_point ? 9 : 10;
-
 # Allocation of base connection string shared among multiple tests.
 my $common_connstr;
 
@@ -47,7 +60,7 @@ $node->start;
 # Configure server for SSL connections, with password handling.
 configure_test_server_for_ssl($node, $SERVERHOSTADDR, $SERVERHOSTCIDR,
 	"scram-sha-256", "pass", "scram-sha-256");
-switch_server_cert($node, 'server-cn-only');
+switch_server_cert($node, certfile => 'server-cn-only', nssdatabase => 'server-cn-only.crt__server-cn-only.key.db');
 $ENV{PGPASSWORD} = "pass";
 $common_connstr =
   "dbname=trustdb sslmode=require sslcert=invalid sslrootcert=invalid hostaddr=$SERVERHOSTADDR";
@@ -97,7 +110,7 @@ my $client_tmp_key = "ssl/client_scram_tmp.key";
 copy("ssl/client.key", $client_tmp_key);
 chmod 0600, $client_tmp_key;
 test_connect_fails(
-	"sslcert=ssl/client.crt sslkey=$client_tmp_key sslrootcert=invalid hostaddr=$SERVERHOSTADDR",
+	"sslcert=ssl/client.crt sslkey=$client_tmp_key sslrootcert=invalid hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client.crt__client.key.db",
 	"dbname=certdb user=ssltestuser channel_binding=require",
 	qr/channel binding required, but server authenticated client without channel binding/,
 	"Cert authentication and channel_binding=require");
diff --git a/src/test/ssl/t/SSL/Backend/NSS.pm b/src/test/ssl/t/SSL/Backend/NSS.pm
new file mode 100644
index 0000000000..20633fe41b
--- /dev/null
+++ b/src/test/ssl/t/SSL/Backend/NSS.pm
@@ -0,0 +1,61 @@
+package SSL::Backend::NSS;
+
+use strict;
+use warnings;
+use Exporter;
+
+our @ISA       = qw(Exporter);
+our @EXPORT_OK = qw(get_new_nss_backend);
+
+sub new
+{
+	my ($class) = @_;
+
+	my $self = { _library => 'NSS' };
+
+	bless $self, $class;
+
+	return $self;
+}
+
+sub get_new_nss_backend
+{
+	my $class = 'SSL::Backend::NSS';
+
+	return $class->new();
+}
+
+sub init
+{
+	# Make sure the certificate databases are in place?
+}
+
+sub get_library
+{
+	my ($self) = @_;
+
+	return $self->{_library};
+}
+
+sub set_server_cert
+{
+	my $self   = $_[0];
+	my $params = $_[1];
+
+	$params->{cafile} = 'root+client_ca' unless defined $params->{cafile};
+
+	my $sslconf =
+	    "ssl_ca_file='$params->{cafile}.crt'\n"
+	  . "ssl_cert_file='ssl/$params->{certfile}.crt'\n"
+	  . "ssl_crl_file=''\n"
+	  . "ssl_database='nss/$params->{nssdatabase}'\n";
+
+	return $sslconf;
+}
+
+sub cleanup
+{
+	# Something?
+}
+
+1;
diff --git a/src/test/ssl/t/SSL/Backend/OpenSSL.pm b/src/test/ssl/t/SSL/Backend/OpenSSL.pm
index 62b11b7632..f74caf67fe 100644
--- a/src/test/ssl/t/SSL/Backend/OpenSSL.pm
+++ b/src/test/ssl/t/SSL/Backend/OpenSSL.pm
@@ -71,16 +71,19 @@ sub init
 # the server so that the configuration takes effect.
 sub set_server_cert
 {
-	my $self     = $_[0];
-	my $certfile = $_[1];
-	my $cafile   = $_[2] || "root+client_ca";
-	my $keyfile  = $_[3] || $certfile;
+	my $self   = $_[0];
+	my $params = $_[1];
+
+	$params->{cafile} = 'root+client_ca' unless defined $params->{cafile};
+	$params->{crlfile} = 'root+client.crl' unless defined $params->{crlfile};
+	$params->{keyfile} = $params->{certfile} unless defined $params->{keyfile};
 
 	my $sslconf =
-	    "ssl_ca_file='$cafile.crt'\n"
-	  . "ssl_cert_file='$certfile.crt'\n"
-	  . "ssl_key_file='$keyfile.key'\n"
-	  . "ssl_crl_file='root+client.crl'\n";
+	    "ssl_ca_file='$params->{cafile}.crt'\n"
+	  . "ssl_cert_file='$params->{certfile}.crt'\n"
+	  . "ssl_key_file='$params->{keyfile}.key'\n"
+	  . "ssl_crl_file='$params->{crlfile}'\n";
+	$sslconf .= "ssl_crl_dir='$params->{crldir}'\n" if defined $params->{crldir};
 
 	return $sslconf;
 }
diff --git a/src/test/ssl/t/SSL/Server.pm b/src/test/ssl/t/SSL/Server.pm
index e59554f85b..da25645d25 100644
--- a/src/test/ssl/t/SSL/Server.pm
+++ b/src/test/ssl/t/SSL/Server.pm
@@ -55,7 +55,6 @@ elsif ($ENV{with_ssl} eq 'nss')
 use Exporter 'import';
 our @EXPORT = qw(
   configure_test_server_for_ssl
-  set_server_cert
   switch_server_cert
   test_connect_fails
   test_connect_ok
@@ -202,46 +201,25 @@ sub cleanup
 	$backend->cleanup();
 }
 
-# Change the configuration to use given server cert file,
-sub set_server_cert
+# Change the configuration to use the given set of certificate, key, ca and
+# CRL, and potentially reload the configuration by restarting the server so
+# that the configuration takes effect.  Restarting is the default, passing
+# restart => 'no' opts out of it leaving the server running.
+sub switch_server_cert
 {
-	my $node     = $_[0];
-	my $certfile = $_[1];
-	my $cafile   = $_[2] || "root+client_ca";
-	my $keyfile  = $_[3] || '';
-	my $pwcmd    = $_[4] || '';
-	my $crlfile  = "root+client.crl";
-	my $crldir;
-	my $pgdata   = $node->data_dir;
-
-	$keyfile = $certfile if $keyfile eq '';
-
-	# defaults to use crl file
-	if (defined $_[3] || defined $_[4])
-	{
-		$crlfile = $_[3];
-		$crldir = $_[4];
-	}
+	my $node   = shift;
+	my %params = @_;
+	my $pgdata = $node->data_dir;
 
 	open my $sslconf, '>', "$pgdata/sslconfig.conf";
 	print $sslconf "ssl=on\n";
-	print $sslconf $backend->set_server_cert($certfile, $cafile, $keyfile);
-	print $sslconf "ssl_crl_file='$crlfile'\n" if defined $crlfile;
-	print $sslconf "ssl_crl_dir='$crldir'\n" if defined $crldir;
-	print $sslconf "ssl_passphrase_command='$pwcmd'\n"
-	  unless $pwcmd eq '';
+	print $sslconf $backend->set_server_cert(\%params);
+	print $sslconf "ssl_passphrase_command='" . $params{passphrase_cmd} . "'\n"
+	  if defined $params{passphrase_cmd};
 	close $sslconf;
-	return;
-}
 
-# Change the configuration to use given server cert file, and reload
-# the server so that the configuration takes effect.
-# Takes the same arguments as set_server_cert, which it calls to do that
-# piece of the work.
-sub switch_server_cert
-{
-	my $node = $_[0];
-	set_server_cert(@_);
+	return if (defined($params{restart}) && $params{restart} eq 'no');
+
 	$node->restart;
 	return;
 }
-- 
2.21.1 (Apple Git-122.3)

From 8eeae109b4bbcc84b343128b20c371d450d66e51 Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Mon, 8 Feb 2021 23:52:34 +0100
Subject: [PATCH v29 2/9] Refactor SSL testharness for multiple library

The SSL testharness was fully tied to OpenSSL in the way the server was
set up and reconfigured. This refactors the SSLServer module into a SSL
library agnostic SSL/Server module which in turn use SSL/Backend/<lib>
modules for the implementation details.

No changes are done to the actual tests, this only change how setup and
teardown is performed.
---
 src/test/ssl/t/001_ssltests.pl                |  56 ++--------
 src/test/ssl/t/002_scram.pl                   |   6 +-
 src/test/ssl/t/SSL/Backend/OpenSSL.pm         | 103 ++++++++++++++++++
 .../ssl/t/{SSLServer.pm => SSL/Server.pm}     |  83 +++++++++++---
 4 files changed, 181 insertions(+), 67 deletions(-)
 create mode 100644 src/test/ssl/t/SSL/Backend/OpenSSL.pm
 rename src/test/ssl/t/{SSLServer.pm => SSL/Server.pm} (78%)

diff --git a/src/test/ssl/t/001_ssltests.pl b/src/test/ssl/t/001_ssltests.pl
index 864f6e209f..30b68bddbe 100644
--- a/src/test/ssl/t/001_ssltests.pl
+++ b/src/test/ssl/t/001_ssltests.pl
@@ -4,12 +4,10 @@ use PostgresNode;
 use TestLib;
 use Test::More;
 
-use File::Copy;
-
 use FindBin;
 use lib $FindBin::RealBin;
 
-use SSLServer;
+use SSL::Server;
 
 if ($ENV{with_ssl} ne 'openssl')
 {
@@ -32,32 +30,6 @@ my $SERVERHOSTCIDR = '127.0.0.1/32';
 # Allocation of base connection string shared among multiple tests.
 my $common_connstr;
 
-# The client's private key must not be world-readable, so take a copy
-# of the key stored in the code tree and update its permissions.
-#
-# This changes ssl/client.key to ssl/client_tmp.key etc for the rest
-# of the tests.
-my @keys = (
-	"client",     "client-revoked",
-	"client-der", "client-encrypted-pem",
-	"client-encrypted-der");
-foreach my $key (@keys)
-{
-	copy("ssl/${key}.key", "ssl/${key}_tmp.key")
-	  or die
-	  "couldn't copy ssl/${key}.key to ssl/${key}_tmp.key for permissions change: $!";
-	chmod 0600, "ssl/${key}_tmp.key"
-	  or die "failed to change permissions on ssl/${key}_tmp.key: $!";
-}
-
-# Also make a copy of that explicitly world-readable.  We can't
-# necessarily rely on the file in the source tree having those
-# permissions.  Add it to @keys to include it in the final clean
-# up phase.
-copy("ssl/client.key", "ssl/client_wrongperms_tmp.key");
-chmod 0644, "ssl/client_wrongperms_tmp.key";
-push @keys, 'client_wrongperms';
-
 #### Set up the server.
 
 note "setting up data directory";
@@ -72,32 +44,22 @@ $node->start;
 
 # Run this before we lock down access below.
 my $result = $node->safe_psql('postgres', "SHOW ssl_library");
-is($result, 'OpenSSL', 'ssl_library parameter');
+is($result, SSL::Server::ssl_library(), 'ssl_library parameter');
 
 configure_test_server_for_ssl($node, $SERVERHOSTADDR, $SERVERHOSTCIDR,
 	'trust');
 
 note "testing password-protected keys";
 
-open my $sslconf, '>', $node->data_dir . "/sslconfig.conf";
-print $sslconf "ssl=on\n";
-print $sslconf "ssl_cert_file='server-cn-only.crt'\n";
-print $sslconf "ssl_key_file='server-password.key'\n";
-print $sslconf "ssl_passphrase_command='echo wrongpassword'\n";
-close $sslconf;
-
+set_server_cert($node, 'server-cn-only', 'root+client_ca',
+				   'server-password', 'echo wrongpassword');
 command_fails(
 	[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
 	'restart fails with password-protected key file with wrong password');
 $node->_update_pid(0);
 
-open $sslconf, '>', $node->data_dir . "/sslconfig.conf";
-print $sslconf "ssl=on\n";
-print $sslconf "ssl_cert_file='server-cn-only.crt'\n";
-print $sslconf "ssl_key_file='server-password.key'\n";
-print $sslconf "ssl_passphrase_command='echo secret1'\n";
-close $sslconf;
-
+set_server_cert($node, 'server-cn-only', 'root+client_ca',
+				'server-password', 'echo secret1');
 command_ok(
 	[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
 	'restart succeeds with password-protected key file');
@@ -574,7 +536,5 @@ test_connect_fails(
 	"certificate authorization fails with revoked client cert with server-side CRL directory");
 
 # clean up
-foreach my $key (@keys)
-{
-	unlink("ssl/${key}_tmp.key");
-}
+
+SSL::Server::cleanup();
diff --git a/src/test/ssl/t/002_scram.pl b/src/test/ssl/t/002_scram.pl
index 410b9e910d..3383b3e531 100644
--- a/src/test/ssl/t/002_scram.pl
+++ b/src/test/ssl/t/002_scram.pl
@@ -11,11 +11,11 @@ use File::Copy;
 use FindBin;
 use lib $FindBin::RealBin;
 
-use SSLServer;
+use SSL::Server;
 
 if ($ENV{with_ssl} ne 'openssl')
 {
-	plan skip_all => 'OpenSSL not supported by this build';
+	plan skip_all => 'SSL not supported by this build';
 }
 
 # This is the hostname used to connect to the server.
@@ -104,5 +104,3 @@ test_connect_fails(
 
 # clean up
 unlink($client_tmp_key);
-
-done_testing($number_of_tests);
diff --git a/src/test/ssl/t/SSL/Backend/OpenSSL.pm b/src/test/ssl/t/SSL/Backend/OpenSSL.pm
new file mode 100644
index 0000000000..62b11b7632
--- /dev/null
+++ b/src/test/ssl/t/SSL/Backend/OpenSSL.pm
@@ -0,0 +1,103 @@
+package SSL::Backend::OpenSSL;
+
+use strict;
+use warnings;
+use Exporter;
+use File::Copy;
+
+our @ISA       = qw(Exporter);
+our @EXPORT_OK = qw(get_new_openssl_backend);
+
+our (@keys);
+
+INIT
+{
+	@keys = (
+		"client",     "client-revoked",
+		"client-der", "client-encrypted-pem",
+		"client-encrypted-der");
+}
+
+sub new
+{
+	my ($class) = @_;
+
+	my $self = { _library => 'OpenSSL' };
+
+	bless $self, $class;
+
+	return $self;
+}
+
+sub get_new_openssl_backend
+{
+	my $class = 'SSL::Backend::OpenSSL';
+
+	my $backend = $class->new();
+
+	return $backend;
+}
+
+sub init
+{
+	# The client's private key must not be world-readable, so take a copy
+	# of the key stored in the code tree and update its permissions.
+	#
+	# This changes ssl/client.key to ssl/client_tmp.key etc for the rest
+	# of the tests.
+	foreach my $key (@keys)
+	{
+		copy("ssl/${key}.key", "ssl/${key}_tmp.key")
+		  or die
+		  "couldn't copy ssl/${key}.key to ssl/${key}_tmp.key for permissions change: $!";
+		chmod 0600, "ssl/${key}_tmp.key"
+		  or die "failed to change permissions on ssl/${key}_tmp.key: $!";
+	}
+
+	# Also make a copy of that explicitly world-readable.  We can't
+	# necessarily rely on the file in the source tree having those
+	# permissions. Add it to @keys to include it in the final clean
+	# up phase.
+	copy("ssl/client.key", "ssl/client_wrongperms_tmp.key")
+	  or die
+	  "couldn't copy ssl/client.key to ssl/client_wrongperms_tmp.key: $!";
+	chmod 0644, "ssl/client_wrongperms_tmp.key"
+	  or die
+	  "failed to change permissions on ssl/client_wrongperms_tmp.key: $!";
+	push @keys, 'client_wrongperms';
+}
+
+# Change the configuration to use given server cert file, and reload
+# the server so that the configuration takes effect.
+sub set_server_cert
+{
+	my $self     = $_[0];
+	my $certfile = $_[1];
+	my $cafile   = $_[2] || "root+client_ca";
+	my $keyfile  = $_[3] || $certfile;
+
+	my $sslconf =
+	    "ssl_ca_file='$cafile.crt'\n"
+	  . "ssl_cert_file='$certfile.crt'\n"
+	  . "ssl_key_file='$keyfile.key'\n"
+	  . "ssl_crl_file='root+client.crl'\n";
+
+	return $sslconf;
+}
+
+sub get_library
+{
+	my ($self) = @_;
+
+	return $self->{_library};
+}
+
+sub cleanup
+{
+	foreach my $key (@keys)
+	{
+		unlink("ssl/${key}_tmp.key");
+	}
+}
+
+1;
diff --git a/src/test/ssl/t/SSLServer.pm b/src/test/ssl/t/SSL/Server.pm
similarity index 78%
rename from src/test/ssl/t/SSLServer.pm
rename to src/test/ssl/t/SSL/Server.pm
index 5ec5e0dac8..e59554f85b 100644
--- a/src/test/ssl/t/SSLServer.pm
+++ b/src/test/ssl/t/SSL/Server.pm
@@ -23,19 +23,39 @@
 # explicitly because an invalid sslcert or sslrootcert, respectively,
 # causes those to be ignored.)
 
-package SSLServer;
+package SSL::Server;
 
 use strict;
 use warnings;
 use PostgresNode;
+use RecursiveCopy;
 use TestLib;
 use File::Basename;
 use File::Copy;
 use Test::More;
+use SSL::Backend::OpenSSL qw(get_new_openssl_backend);
+use SSL::Backend::NSS qw(get_new_nss_backend);
+
+our ($openssl, $nss, $backend);
+
+# The TLS backend which the server is using should be mostly transparent for
+# the user, apart from individual configuration settings, so keep the backend
+# specific things abstracted behind SSL::Server.
+if ($ENV{with_ssl} eq 'openssl')
+{
+	$backend = get_new_openssl_backend();
+	$openssl = 1;
+}
+elsif ($ENV{with_ssl} eq 'nss')
+{
+	$backend = get_new_nss_backend();
+	$nss     = 1;
+}
 
 use Exporter 'import';
 our @EXPORT = qw(
   configure_test_server_for_ssl
+  set_server_cert
   switch_server_cert
   test_connect_fails
   test_connect_ok
@@ -144,14 +164,21 @@ sub configure_test_server_for_ssl
 	close $sslconf;
 
 	# Copy all server certificates and keys, and client root cert, to the data dir
-	copy_files("ssl/server-*.crt", $pgdata);
-	copy_files("ssl/server-*.key", $pgdata);
-	chmod(0600, glob "$pgdata/server-*.key") or die $!;
-	copy_files("ssl/root+client_ca.crt", $pgdata);
-	copy_files("ssl/root_ca.crt",        $pgdata);
-	copy_files("ssl/root+client.crl",    $pgdata);
-	mkdir("$pgdata/root+client-crldir");
-	copy_files("ssl/root+client-crldir/*", "$pgdata/root+client-crldir/");
+	if (defined($openssl))
+	{
+		copy_files("ssl/server-*.crt", $pgdata);
+		copy_files("ssl/server-*.key", $pgdata);
+		chmod(0600, glob "$pgdata/server-*.key") or die $!;
+		copy_files("ssl/root+client_ca.crt", $pgdata);
+		copy_files("ssl/root_ca.crt",        $pgdata);
+		copy_files("ssl/root+client.crl",    $pgdata);
+		mkdir("$pgdata/root+client-crldir");
+		copy_files("ssl/root+client-crldir/*", "$pgdata/root+client-crldir/");
+	}
+	elsif (defined($nss))
+	{
+		RecursiveCopy::copypath("ssl/nss", $pgdata . "/nss") if -e "ssl/nss";
+	}
 
 	# Stop and restart server to load new listen_addresses.
 	$node->restart;
@@ -159,20 +186,36 @@ sub configure_test_server_for_ssl
 	# Change pg_hba after restart because hostssl requires ssl=on
 	configure_hba_for_ssl($node, $servercidr, $authmethod);
 
+	# Finally, perform backend specific configuration
+	$backend->init();
+
 	return;
 }
 
-# Change the configuration to use given server cert file, and reload
-# the server so that the configuration takes effect.
-sub switch_server_cert
+sub ssl_library
+{
+	return $backend->get_library();
+}
+
+sub cleanup
+{
+	$backend->cleanup();
+}
+
+# Change the configuration to use given server cert file,
+sub set_server_cert
 {
 	my $node     = $_[0];
 	my $certfile = $_[1];
 	my $cafile   = $_[2] || "root+client_ca";
+	my $keyfile  = $_[3] || '';
+	my $pwcmd    = $_[4] || '';
 	my $crlfile  = "root+client.crl";
 	my $crldir;
 	my $pgdata   = $node->data_dir;
 
+	$keyfile = $certfile if $keyfile eq '';
+
 	# defaults to use crl file
 	if (defined $_[3] || defined $_[4])
 	{
@@ -182,13 +225,23 @@ sub switch_server_cert
 
 	open my $sslconf, '>', "$pgdata/sslconfig.conf";
 	print $sslconf "ssl=on\n";
-	print $sslconf "ssl_ca_file='$cafile.crt'\n";
-	print $sslconf "ssl_cert_file='$certfile.crt'\n";
-	print $sslconf "ssl_key_file='$certfile.key'\n";
+	print $sslconf $backend->set_server_cert($certfile, $cafile, $keyfile);
 	print $sslconf "ssl_crl_file='$crlfile'\n" if defined $crlfile;
 	print $sslconf "ssl_crl_dir='$crldir'\n" if defined $crldir;
+	print $sslconf "ssl_passphrase_command='$pwcmd'\n"
+	  unless $pwcmd eq '';
 	close $sslconf;
+	return;
+}
 
+# Change the configuration to use given server cert file, and reload
+# the server so that the configuration takes effect.
+# Takes the same arguments as set_server_cert, which it calls to do that
+# piece of the work.
+sub switch_server_cert
+{
+	my $node = $_[0];
+	set_server_cert(@_);
 	$node->restart;
 	return;
 }
-- 
2.21.1 (Apple Git-122.3)

From ef8570b22e8d8360a28110d5bae4c11525e637f6 Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Mon, 8 Feb 2021 23:52:22 +0100
Subject: [PATCH v29 1/9] nss: Support libnss as TLS library in libpq

This commit contains the frontend and backend portion of TLS support
in libpq to allow encrypted connections. The implementation is done
as a drop-in replacement for the OpenSSL support and leverages the
same internal API for abstracting library specific details.

A new GUC, ssl_database, is used to identify the NSS database used for
the serverside certificates and keys. The existing certificate and key
GUCs are used for providing certificate and key nicknames.

Client side there is a new connection parameter, cert_database, to
identify the client cert and key. All existing sslmodes are supported
in the same way as with OpenSSL.

Authors: Daniel Gustafsson, Andrew Dunstan, Jacob Champion
Reviewed-by: Michael Paquier
---
 .../postgres_fdw/expected/postgres_fdw.out    |    2 +-
 src/backend/libpq/auth.c                      |    7 +
 src/backend/libpq/be-secure-nss.c             | 1388 +++++++++++++++++
 src/backend/libpq/be-secure.c                 |    3 +
 src/backend/utils/misc/guc.c                  |   20 +-
 src/common/cipher_nss.c                       |  192 +++
 src/include/common/nss.h                      |   49 +
 src/include/libpq/libpq-be.h                  |   10 +-
 src/include/libpq/libpq.h                     |    3 +
 src/include/pg_config_manual.h                |    2 +-
 src/interfaces/libpq/fe-connect.c             |    4 +
 src/interfaces/libpq/fe-secure-nss.c          | 1088 +++++++++++++
 src/interfaces/libpq/fe-secure.c              |   21 +
 src/interfaces/libpq/libpq-fe.h               |   11 +
 src/interfaces/libpq/libpq-int.h              |   25 +-
 15 files changed, 2820 insertions(+), 5 deletions(-)
 create mode 100644 src/backend/libpq/be-secure-nss.c
 create mode 100644 src/common/cipher_nss.c
 create mode 100644 src/include/common/nss.h
 create mode 100644 src/interfaces/libpq/fe-secure-nss.c

diff --git a/contrib/postgres_fdw/expected/postgres_fdw.out b/contrib/postgres_fdw/expected/postgres_fdw.out
index 0649b6b81c..3d51a7c9b8 100644
--- a/contrib/postgres_fdw/expected/postgres_fdw.out
+++ b/contrib/postgres_fdw/expected/postgres_fdw.out
@@ -8946,7 +8946,7 @@ DO $d$
     END;
 $d$;
 ERROR:  invalid option "password"
-HINT:  Valid options in this context are: service, passfile, channel_binding, connect_timeout, dbname, host, hostaddr, port, options, application_name, keepalives, keepalives_idle, keepalives_interval, keepalives_count, tcp_user_timeout, sslmode, sslcompression, sslcert, sslkey, sslrootcert, sslcrl, sslcrldir, requirepeer, ssl_min_protocol_version, ssl_max_protocol_version, gssencmode, krbsrvname, gsslib, target_session_attrs, use_remote_estimate, fdw_startup_cost, fdw_tuple_cost, extensions, updatable, fetch_size, batch_size
+HINT:  Valid options in this context are: service, passfile, channel_binding, connect_timeout, dbname, host, hostaddr, port, options, application_name, keepalives, keepalives_idle, keepalives_interval, keepalives_count, tcp_user_timeout, sslmode, sslcompression, sslcert, sslkey, sslrootcert, sslcrl, sslcrldir, requirepeer, ssl_min_protocol_version, ssl_max_protocol_version, gssencmode, krbsrvname, gsslib, target_session_attrs, cert_database, use_remote_estimate, fdw_startup_cost, fdw_tuple_cost, extensions, updatable, fetch_size, batch_size
 CONTEXT:  SQL statement "ALTER SERVER loopback_nopw OPTIONS (ADD password 'dummypw')"
 PL/pgSQL function inline_code_block line 3 at EXECUTE
 -- If we add a password for our user mapping instead, we should get a different
diff --git a/src/backend/libpq/auth.c b/src/backend/libpq/auth.c
index baa0712c0f..db08a75326 100644
--- a/src/backend/libpq/auth.c
+++ b/src/backend/libpq/auth.c
@@ -2849,7 +2849,14 @@ CheckCertAuth(Port *port)
 {
 	int			status_check_usermap = STATUS_ERROR;
 
+#if defined(USE_OPENSSL)
 	Assert(port->ssl);
+#elif defined(USE_NSS)
+	/* TODO: should we rename pr_fd to ssl, to keep consistency? */
+	Assert(port->pr_fd);
+#else
+	Assert(false);
+#endif
 
 	/* Make sure we have received a username in the certificate */
 	if (port->peer_cn == NULL ||
diff --git a/src/backend/libpq/be-secure-nss.c b/src/backend/libpq/be-secure-nss.c
new file mode 100644
index 0000000000..a17e6c7e5d
--- /dev/null
+++ b/src/backend/libpq/be-secure-nss.c
@@ -0,0 +1,1388 @@
+/*-------------------------------------------------------------------------
+ *
+ * be-secure-nss.c
+ *	  functions for supporting NSS as a TLS backend
+ *
+ *
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ *	  src/backend/libpq/be-secure-nss.c
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#include "postgres.h"
+
+#include <sys/stat.h>
+
+#include "common/nss.h"
+
+/*
+ * The nspr/obsolete/protypes.h NSPR header typedefs uint64 and int64 with
+ * colliding definitions from ours, causing a much expected compiler error.
+ * Remove backwards compatibility with ancient NSPR versions to avoid this.
+ */
+#define NO_NSPR_10_SUPPORT
+#include <nspr/nspr.h>
+#include <nspr/prerror.h>
+#include <nspr/prio.h>
+#include <nspr/prmem.h>
+#include <nspr/prtypes.h>
+
+#include <nss/nss.h>
+#include <nss/base64.h>
+#include <nss/cert.h>
+#include <nss/certdb.h>
+#include <nss/hasht.h>
+#include <nss/keyhi.h>
+#include <nss/pk11pub.h>
+#include <nss/secder.h>
+#include <nss/secerr.h>
+#include <nss/secitem.h>
+#include <nss/secoidt.h>
+#include <nss/secport.h>
+#include <nss/ssl.h>
+#include <nss/sslerr.h>
+#include <nss/sslproto.h>
+
+#include "lib/stringinfo.h"
+#include "libpq/libpq.h"
+#include "nodes/pg_list.h"
+#include "miscadmin.h"
+#include "storage/fd.h"
+#include "utils/guc.h"
+#include "utils/memutils.h"
+
+
+/* default init hook can be overridden by a shared library */
+static void default_nss_tls_init(bool isServerStart);
+nss_tls_init_hook_type nss_tls_init_hook = default_nss_tls_init;
+
+static PRDescIdentity pr_id;
+
+static PRIOMethods pr_iomethods;
+static NSSInitContext *nss_context = NULL;
+static SSLVersionRange desired_sslver;
+
+static char *external_ssl_passphrase_cb(PK11SlotInfo *slot, PRBool retry, void *arg);
+static SECStatus pg_SSLShutdownFunc(void *private_data, void *nss_data);
+static bool dummy_ssl_passwd_cb_called = false;
+static bool ssl_is_server_start;
+
+/*
+ * PR_ImportTCPSocket() is a private API, but very widely used, as it's the
+ * only way to make NSS use an already set up POSIX file descriptor rather
+ * than opening one itself. To quote the NSS documentation:
+ *
+ *		"In theory, code that uses PR_ImportTCPSocket may break when NSPR's
+ *		implementation changes. In practice, this is unlikely to happen because
+ *		NSPR's implementation has been stable for years and because of NSPR's
+ *		strong commitment to backward compatibility."
+ *
+ * https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSPR/Reference/PR_ImportTCPSocket
+ *
+ * The function is declared in <private/pprio.h>, but as it is a header marked
+ * private we declare it here rather than including it.
+ */
+NSPR_API(PRFileDesc *) PR_ImportTCPSocket(int);
+
+/* NSS IO layer callback overrides */
+static PRInt32 pg_ssl_read(PRFileDesc *fd, void *buf, PRInt32 amount,
+						   PRIntn flags, PRIntervalTime timeout);
+static PRInt32 pg_ssl_write(PRFileDesc *fd, const void *buf, PRInt32 amount,
+							PRIntn flags, PRIntervalTime timeout);
+static PRStatus pg_ssl_close(PRFileDesc *fd);
+/* Utility functions */
+static PRFileDesc *init_iolayer(Port *port);
+static uint16 ssl_protocol_version_to_nss(int v, const char *guc_name);
+
+static char *pg_SSLerrmessage(PRErrorCode errcode);
+static char *ssl_protocol_version_to_string(int v);
+static SECStatus pg_cert_auth_handler(void *arg, PRFileDesc *fd,
+									  PRBool checksig, PRBool isServer);
+static SECStatus pg_bad_cert_handler(void *arg, PRFileDesc *fd);
+static char *dummy_ssl_passphrase_cb(PK11SlotInfo *slot, PRBool retry, void *arg);
+
+/* ------------------------------------------------------------ */
+/*						 Public interface						*/
+/* ------------------------------------------------------------ */
+
+/*
+ * be_tls_init
+ *			Initialize the nss TLS library in the postmaster
+ *
+ * The majority of the setup needs to happen in be_tls_open_server since the
+ * NSPR initialization must happen after the forking of the backend. We could
+ * potentially move some parts in under !isServerStart, but so far this is the
+ * separation chosen.
+ */
+int
+be_tls_init(bool isServerStart)
+{
+	SECStatus	status;
+	SSLVersionRange supported_sslver;
+
+	status = SSL_ConfigServerSessionIDCacheWithOpt(0, 0, NULL, 1, 0, 0, PR_FALSE);
+	if (status != SECSuccess)
+	{
+		ereport(isServerStart ? FATAL : LOG,
+				(errmsg("unable to connect to TLS connection cache: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+		return -1;
+	}
+
+	if (!ssl_database || strlen(ssl_database) == 0)
+	{
+		ereport(isServerStart ? FATAL : LOG,
+				(errmsg("no certificate database specified")));
+		return -1;
+	}
+
+	/*
+	 * We check for the desired TLS version range here, even though we cannot
+	 * set it until be_open_server such that we can be compatible with how the
+	 * OpenSSL backend reports errors for incompatible range configurations.
+	 * Set either the default supported TLS version range, or the configured
+	 * range from ssl_min_protocol_version and ssl_max_protocol version. In
+	 * case the user hasn't defined the maximum allowed version we fall back
+	 * to the highest version TLS that the library supports.
+	 */
+	if (SSL_VersionRangeGetSupported(ssl_variant_stream, &supported_sslver) != SECSuccess)
+	{
+		ereport(isServerStart ? FATAL : LOG,
+				(errmsg("unable to get default protocol support from NSS")));
+		return -1;
+	}
+
+	/*
+	 * Set the fallback versions for the TLS protocol version range to a
+	 * combination of our minimal requirement and the library maximum. Error
+	 * messages should be kept identical to those in be-secure-openssl.c to
+	 * make translations easier.
+	 */
+	desired_sslver.min = SSL_LIBRARY_VERSION_TLS_1_0;
+	desired_sslver.max = supported_sslver.max;
+
+	if (ssl_min_protocol_version)
+	{
+		int			ver = ssl_protocol_version_to_nss(ssl_min_protocol_version,
+													  "ssl_min_protocol_version");
+
+		if (ver == -1)
+		{
+			ereport(isServerStart ? FATAL : LOG,
+					(errmsg("\"%s\" setting \"%s\" not supported by this build",
+							"ssl_min_protocol_version",
+							GetConfigOption("ssl_min_protocol_version",
+											false, false))));
+			return -1;
+		}
+
+		if (ver > 0)
+			desired_sslver.min = ver;
+	}
+
+	if (ssl_max_protocol_version)
+	{
+		int			ver = ssl_protocol_version_to_nss(ssl_max_protocol_version,
+													  "ssl_max_protocol_version");
+
+		if (ver == -1)
+		{
+			ereport(isServerStart ? FATAL : LOG,
+					(errmsg("\"%s\" setting \"%s\" not supported by this build",
+							"ssl_max_protocol_version",
+							GetConfigOption("ssl_max_protocol_version",
+											false, false))));
+			return -1;
+		}
+		if (ver > 0)
+			desired_sslver.max = ver;
+
+		if (ver < desired_sslver.min)
+		{
+			ereport(isServerStart ? FATAL : LOG,
+					(errmsg("could not set SSL protocol version range"),
+					 errdetail("\"%s\" cannot be higher than \"%s\"",
+							   "ssl_min_protocol_version",
+							   "ssl_max_protocol_version")));
+			return -1;
+		}
+	}
+
+	/*
+	 * Set the passphrase callback which will be used both to obtain the
+	 * passphrase from the user, as well as by NSS to obtain the phrase
+	 * repeatedly.
+	 */
+	ssl_is_server_start = isServerStart;
+	(*nss_tls_init_hook) (isServerStart);
+
+	return 0;
+}
+
+int
+be_tls_open_server(Port *port)
+{
+	SECStatus	status;
+	PRFileDesc *model;
+	PRFileDesc *pr_fd;
+	PRFileDesc *layer;
+	CERTCertificate *server_cert;
+	SECKEYPrivateKey *private_key;
+	CERTSignedCrl *crl;
+	SECItem		crlname;
+	char	   *cert_database;
+	NSSInitParameters params;
+
+	/*
+	 * The NSPR documentation states that runtime initialization via PR_Init
+	 * is no longer required, as the first caller into NSPR will perform the
+	 * initialization implicitly. The documentation doesn't however clarify
+	 * from which version this is holds true, so let's perform the potentially
+	 * superfluous initialization anyways to avoid crashing on older versions
+	 * of NSPR, as there is no difference in overhead.  The NSS documentation
+	 * still states that PR_Init must be called in some way (implicitly or
+	 * explicitly).
+	 *
+	 * The below parameters are what the implicit initialization would've done
+	 * for us, and should work even for older versions where it might not be
+	 * done automatically. The last parameter, maxPTDs, is set to various
+	 * values in other codebases, but has been unused since NSPR 2.1 which was
+	 * released sometime in 1998. In current versions of NSPR all parameters
+	 * are ignored.
+	 */
+	PR_Init(PR_USER_THREAD, PR_PRIORITY_NORMAL, 0 /* maxPTDs */ );
+
+	/*
+	 * The certificate path (configdir) must contain a valid NSS database. If
+	 * the certificate path isn't a valid directory, NSS will fall back on the
+	 * system certificate database. If the certificate path is a directory but
+	 * is empty then the initialization will fail. On the client side this can
+	 * be allowed for any sslmode but the verify-xxx ones.
+	 * https://bugzilla.redhat.com/show_bug.cgi?id=728562 For the server side
+	 * we won't allow this to fail however, as we require the certificate and
+	 * key to exist.
+	 *
+	 * The original design of NSS was for a single application to use a single
+	 * copy of it, initialized with NSS_Initialize() which isn't returning any
+	 * handle with which to refer to NSS. NSS initialization and shutdown are
+	 * global for the application, so a shutdown in another NSS enabled
+	 * library would cause NSS to be stopped for libpq as well.  The fix has
+	 * been to introduce NSS_InitContext which returns a context handle to
+	 * pass to NSS_ShutdownContext.  NSS_InitContext was introduced in NSS
+	 * 3.12, but the use of it is not very well documented.
+	 * https://bugzilla.redhat.com/show_bug.cgi?id=738456
+	 *
+	 * The InitParameters struct passed can be used to override internal
+	 * values in NSS, but the usage is not documented at all. When using
+	 * NSS_Init initializations, the values are instead set via PK11_Configure
+	 * calls so the PK11_Configure documentation can be used to glean some
+	 * details on these.
+	 *
+	 * https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS/PKCS11/Module_Specs
+	 */
+	memset(&params, '\0', sizeof(params));
+	params.length = sizeof(params);
+
+	if (!ssl_database || strlen(ssl_database) == 0)
+		ereport(FATAL,
+				(errmsg("no certificate database specified")));
+
+	cert_database = psprintf("sql:%s", ssl_database);
+	nss_context = NSS_InitContext(cert_database, "", "", "",
+								  &params,
+								  NSS_INIT_READONLY | NSS_INIT_PK11RELOAD);
+	pfree(cert_database);
+
+	if (!nss_context)
+		ereport(FATAL,
+				(errmsg("unable to read certificate database \"%s\": %s",
+						ssl_database, pg_SSLerrmessage(PR_GetError()))));
+
+	/*
+	 * Import the already opened socket as we don't want to use NSPR functions
+	 * for opening the network socket due to how the PostgreSQL protocol works
+	 * with TLS connections. This function is not part of the NSPR public API,
+	 * see the comment at the top of the file for the rationale of still using
+	 * it.
+	 */
+	pr_fd = PR_ImportTCPSocket(port->sock);
+	if (!pr_fd)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to connect to socket")));
+		return -1;
+	}
+
+	/*
+	 * Most of the documentation available, and implementations of, NSS/NSPR
+	 * use the PR_NewTCPSocket() function here, which has the drawback that it
+	 * can only create IPv4 sockets. Instead use PR_OpenTCPSocket() which
+	 * copes with IPv6 as well.
+	 *
+	 * We use a model filedescriptor here which is a construct in NSPR/NSS in
+	 * order to create a configuration template for sockets which can then be
+	 * applied to new sockets created. This makes more sense in a server which
+	 * accepts multiple connections and want to perform the boilerplate just
+	 * once, but it does provide a nice abstraction here as well in that we
+	 * can error out early without having performed any operation on the real
+	 * socket.
+	 */
+	model = PR_OpenTCPSocket(port->laddr.addr.ss_family);
+	if (!model)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to open socket")));
+		return -1;
+	}
+
+	/*
+	 * Convert the NSPR socket to an SSL socket. Ensuring the success of this
+	 * operation is critical as NSS SSL_* functions may return SECSuccess on
+	 * the socket even though SSL hasn't been enabled, which introduce a risk
+	 * of silent downgrades.
+	 */
+	model = SSL_ImportFD(NULL, model);
+	if (!model)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to enable TLS on socket")));
+		return -1;
+	}
+
+	/*
+	 * Configure basic settings for the connection over the SSL socket in
+	 * order to set it up as a server.
+	 */
+	if (SSL_OptionSet(model, SSL_SECURITY, PR_TRUE) != SECSuccess)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to configure TLS connection")));
+		return -1;
+	}
+
+	if (SSL_OptionSet(model, SSL_HANDSHAKE_AS_SERVER, PR_TRUE) != SECSuccess ||
+		SSL_OptionSet(model, SSL_HANDSHAKE_AS_CLIENT, PR_FALSE) != SECSuccess)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to configure TLS connection as server")));
+		return -1;
+	}
+
+	/*
+	 * SSLv2 is disabled by default, and SSLv3 will be excluded from the range
+	 * of allowed protocols further down. Since we really don't want these to
+	 * ever be enabled, let's use belts and suspenders and explicitly turn
+	 * them off as well.
+	 */
+	SSL_OptionSet(model, SSL_ENABLE_SSL2, PR_FALSE);
+	SSL_OptionSet(model, SSL_ENABLE_SSL3, PR_FALSE);
+
+#ifdef SSL_CBC_RANDOM_IV
+
+	/*
+	 * Enable protection against the BEAST attack in case the NSS server has
+	 * support for that. While SSLv3 is disabled, we may still allow TLSv1
+	 * which is affected. The option isn't documented as an SSL option, but as
+	 * an NSS environment variable.
+	 */
+	SSL_OptionSet(model, SSL_CBC_RANDOM_IV, PR_TRUE);
+#endif
+
+	/*
+	 * Configure the allowed ciphers. If there are no user preferred suites,
+	 * set the domestic policy.
+	 *
+	 * Historically there were different cipher policies based on export (and
+	 * import) restrictions: Domestic, Export and France. These are since long
+	 * removed with all ciphers being enabled by default. Due to backwards
+	 * compatibility, the old API is still used even though all three policies
+	 * now do the same thing.
+	 *
+	 * If SSLCipherSuites define a policy of the user, we set that rather than
+	 * enabling all ciphers via NSS_SetDomesticPolicy.
+	 *
+	 * TODO: while this code works, the set of ciphers which can be set and
+	 * still end up with a working socket is woefully underdocumented for
+	 * anything more recent than SSLv3 (the code for TLS actually calls ssl3
+	 * functions under the hood for SSL_CipherPrefSet), so it's unclear if
+	 * this is helpful or not. Using the policies works, but may be too
+	 * coarsely grained.
+	 *
+	 * Another TODO: The SSL_ImplementedCiphers table returned with calling
+	 * SSL_GetImplementedCiphers is sorted in server preference order. Sorting
+	 * SSLCipherSuites according to the order of the ciphers therein could be
+	 * a way to implement ssl_prefer_server_ciphers - if we at all want to use
+	 * cipher selection for NSS like how we do it for OpenSSL that is.
+	 */
+
+	/*
+	 * If no ciphers are specified, enable them all.
+	 */
+	if (!SSLCipherSuites || strlen(SSLCipherSuites) == 0)
+	{
+		status = NSS_SetDomesticPolicy();
+		if (status != SECSuccess)
+		{
+			ereport(COMMERROR,
+					(errmsg("unable to set cipher policy: %s",
+							pg_SSLerrmessage(PR_GetError()))));
+			return -1;
+		}
+	}
+	else
+	{
+		char	   *ciphers,
+				   *c;
+
+		char	   *sep = ":;, ";
+		PRUint16	ciphercode;
+		const		PRUint16 *nss_ciphers;
+
+		/*
+		 * If the user has specified a set of preferred cipher suites we start
+		 * by turning off all the existing suites to avoid the risk of down-
+		 * grades to a weaker cipher than expected.
+		 */
+		nss_ciphers = SSL_GetImplementedCiphers();
+		for (int i = 0; i < SSL_GetNumImplementedCiphers(); i++)
+			SSL_CipherPrefSet(model, nss_ciphers[i], PR_FALSE);
+
+		ciphers = pstrdup(SSLCipherSuites);
+
+		for (c = strtok(ciphers, sep); c; c = strtok(NULL, sep))
+		{
+			if (!pg_find_cipher(c, &ciphercode))
+			{
+				status = SSL_CipherPrefSet(model, ciphercode, PR_TRUE);
+				if (status != SECSuccess)
+				{
+					ereport(COMMERROR,
+							(errmsg("invalid cipher-suite specified: %s", c)));
+					return -1;
+				}
+			}
+		}
+
+		pfree(ciphers);
+	}
+
+	if (SSL_VersionRangeSet(model, &desired_sslver) != SECSuccess)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to set requested SSL protocol version range")));
+		return -1;
+	}
+
+	/*
+	 * Set up the custom IO layer.
+	 */
+	layer = init_iolayer(port);
+	if (!layer)
+		return -1;
+
+	if (PR_PushIOLayer(pr_fd, PR_TOP_IO_LAYER, layer) != PR_SUCCESS)
+	{
+		PR_Close(layer);
+		ereport(COMMERROR,
+				(errmsg("unable to push IO layer")));
+		return -1;
+	}
+
+	server_cert = PK11_FindCertFromNickname(ssl_cert_file, (void *) port);
+	if (!server_cert)
+	{
+		if (dummy_ssl_passwd_cb_called)
+		{
+			ereport(COMMERROR,
+					(errmsg("unable to load certificate for \"%s\": %s",
+							ssl_cert_file, pg_SSLerrmessage(PR_GetError())),
+					 errhint("The certificate requires a password.")));
+			return -1;
+		}
+		else
+		{
+			ereport(COMMERROR,
+					(errmsg("unable to find certificate for \"%s\": %s",
+							ssl_cert_file, pg_SSLerrmessage(PR_GetError()))));
+			return -1;
+		}
+	}
+
+	private_key = PK11_FindKeyByAnyCert(server_cert, (void *) port);
+	if (!private_key)
+	{
+		if (dummy_ssl_passwd_cb_called)
+		{
+			ereport(COMMERROR,
+					(errmsg("unable to load private key for \"%s\": %s",
+							ssl_cert_file, pg_SSLerrmessage(PR_GetError())),
+					 errhint("The private key requires a password.")));
+			return -1;
+		}
+		else
+		{
+			ereport(COMMERROR,
+					(errmsg("unable to find private key for \"%s\": %s",
+							ssl_cert_file, pg_SSLerrmessage(PR_GetError()))));
+			return -1;
+		}
+	}
+
+	/*
+	 * NSS doesn't use CRL files on disk, so we use the ssl_crl_file guc to
+	 * contain the CRL nickname for the current server certificate in the NSS
+	 * certificate database. The main difference from the OpenSSL backend is
+	 * that NSS will use the CRL regardless, but being able to make sure the
+	 * CRL is loaded seems like a good feature.
+	 */
+	if (ssl_crl_file[0])
+	{
+		SECITEM_CopyItem(NULL, &crlname, &server_cert->derSubject);
+		crl = SEC_FindCrlByName(CERT_GetDefaultCertDB(), &crlname, SEC_CRL_TYPE);
+		if (!crl)
+		{
+			ereport(COMMERROR,
+					(errmsg("specified CRL not found in database")));
+			return -1;
+		}
+		SEC_DestroyCrl(crl);
+	}
+
+	/*
+	 * Finally we must configure the socket for being a server by setting the
+	 * certificate and key. The NULL parameter is an SSLExtraServerCertData
+	 * pointer with the final parameter being the size of the extra server
+	 * cert data structure pointed to. This is typically only used for
+	 * credential delegation.
+	 */
+	status = SSL_ConfigServerCert(model, server_cert, private_key, NULL, 0);
+	if (status != SECSuccess)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to configure server for TLS server connections: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+		return -1;
+	}
+
+	ssl_loaded_verify_locations = true;
+
+	/*
+	 * At this point, we no longer have use for the certificate and private
+	 * key as they have been copied into the context by NSS. Destroy our
+	 * copies explicitly to clean out the memory as best we can.
+	 */
+	CERT_DestroyCertificate(server_cert);
+	SECKEY_DestroyPrivateKey(private_key);
+
+	/* Set up certificate authentication callback */
+	status = SSL_AuthCertificateHook(model, pg_cert_auth_handler, (void *) port);
+	if (status != SECSuccess)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to install authcert hook: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+		return -1;
+	}
+	SSL_BadCertHook(model, pg_bad_cert_handler, (void *) port);
+	SSL_OptionSet(model, SSL_REQUEST_CERTIFICATE, PR_TRUE);
+	SSL_OptionSet(model, SSL_REQUIRE_CERTIFICATE, PR_FALSE);
+
+	port->pr_fd = SSL_ImportFD(model, pr_fd);
+	if (!port->pr_fd)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to initialize")));
+		return -1;
+	}
+
+	PR_Close(model);
+
+	/*
+	 * Force a handshake on the next I/O request, the second parameter means
+	 * that we are a server, PR_FALSE would indicate being a client. NSPR
+	 * requires us to call SSL_ResetHandshake since we imported an already
+	 * established socket.
+	 */
+	status = SSL_ResetHandshake(port->pr_fd, PR_TRUE);
+	if (status != SECSuccess)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to initiate handshake: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+		return -1;
+	}
+	status = SSL_ForceHandshake(port->pr_fd);
+	if (status != SECSuccess)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to handshake: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+		return -1;
+	}
+
+	port->ssl_in_use = true;
+
+	/* Register out shutdown callback */
+	NSS_RegisterShutdown(pg_SSLShutdownFunc, port);
+
+	return 0;
+}
+
+ssize_t
+be_tls_read(Port *port, void *ptr, size_t len, int *waitfor)
+{
+	ssize_t		n_read;
+	PRErrorCode err;
+
+	n_read = PR_Read(port->pr_fd, ptr, len);
+
+	if (n_read < 0)
+	{
+		err = PR_GetError();
+
+		if (err == PR_WOULD_BLOCK_ERROR)
+		{
+			*waitfor = WL_SOCKET_READABLE;
+			errno = EWOULDBLOCK;
+		}
+		else
+			errno = ECONNRESET;
+	}
+
+	return n_read;
+}
+
+ssize_t
+be_tls_write(Port *port, void *ptr, size_t len, int *waitfor)
+{
+	ssize_t		n_write;
+	PRErrorCode err;
+	PRIntn		flags = 0;
+
+	/*
+	 * The flags parameter to PR_Send is no longer used and is, according to
+	 * the documentation, required to be zero.
+	 */
+	n_write = PR_Send(port->pr_fd, ptr, len, flags, PR_INTERVAL_NO_WAIT);
+
+	if (n_write < 0)
+	{
+		err = PR_GetError();
+
+		if (err == PR_WOULD_BLOCK_ERROR)
+		{
+			*waitfor = WL_SOCKET_WRITEABLE;
+			errno = EWOULDBLOCK;
+		}
+		else
+			errno = ECONNRESET;
+	}
+
+	return n_write;
+}
+
+void
+be_tls_close(Port *port)
+{
+	if (!port)
+		return;
+
+	if (port->peer_cn)
+	{
+		SSL_InvalidateSession(port->pr_fd);
+		pfree(port->peer_cn);
+		port->peer_cn = NULL;
+	}
+
+	PR_Close(port->pr_fd);
+	port->pr_fd = NULL;
+	port->ssl_in_use = false;
+
+	if (nss_context)
+	{
+		NSS_ShutdownContext(nss_context);
+		nss_context = NULL;
+	}
+}
+
+void
+be_tls_destroy(void)
+{
+	/*
+	 * It reads a bit odd to clear a session cache when we are destroying the
+	 * context altogether, but if the session cache isn't cleared before
+	 * shutting down the context it will fail with SEC_ERROR_BUSY.
+	 */
+	SSL_ClearSessionCache();
+}
+
+int
+be_tls_get_cipher_bits(Port *port)
+{
+	SECStatus	status;
+	SSLChannelInfo channel;
+	SSLCipherSuiteInfo suite;
+
+	status = SSL_GetChannelInfo(port->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+		goto error;
+
+	status = SSL_GetCipherSuiteInfo(channel.cipherSuite, &suite, sizeof(suite));
+	if (status != SECSuccess)
+		goto error;
+
+	return suite.effectiveKeyBits;
+
+error:
+	ereport(WARNING,
+			(errmsg("unable to extract TLS session information: %s",
+					pg_SSLerrmessage(PR_GetError()))));
+	return 0;
+}
+
+/*
+ * be_tls_get_compression
+ *
+ * NSS disabled support for TLS compression in version 3.33 and removed the
+ * code in a subsequent release. The API for retrieving information about
+ * compression as well as enabling it is kept for backwards compatibility, but
+ * we don't need to consult it since it was only available for SSLv3 which we
+ * don't support.
+ *
+ * https://bugzilla.mozilla.org/show_bug.cgi?id=1409587
+ */
+bool
+be_tls_get_compression(Port *port)
+{
+	return false;
+}
+
+/*
+ * be_tls_get_version
+ *
+ * Returns the protocol version used for the current connection, or NULL in
+ * case of errors.
+ */
+const char *
+be_tls_get_version(Port *port)
+{
+	SECStatus	status;
+	SSLChannelInfo channel;
+
+	status = SSL_GetChannelInfo(port->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+	{
+		ereport(WARNING,
+				(errmsg("unable to extract TLS session information: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+		return NULL;
+	}
+
+	return ssl_protocol_version_to_string(channel.protocolVersion);
+}
+
+const char *
+be_tls_get_cipher(Port *port)
+{
+	SECStatus	status;
+	SSLChannelInfo channel;
+	SSLCipherSuiteInfo suite;
+
+	status = SSL_GetChannelInfo(port->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+		goto error;
+
+	status = SSL_GetCipherSuiteInfo(channel.cipherSuite, &suite, sizeof(suite));
+	if (status != SECSuccess)
+		goto error;
+
+	return suite.cipherSuiteName;
+
+error:
+	ereport(WARNING,
+			(errmsg("unable to extract TLS session information: %s",
+					pg_SSLerrmessage(PR_GetError()))));
+	return NULL;
+}
+
+void
+be_tls_get_peer_subject_name(Port *port, char *ptr, size_t len)
+{
+	CERTCertificate *certificate;
+
+	certificate = SSL_PeerCertificate(port->pr_fd);
+	if (certificate)
+		strlcpy(ptr, CERT_NameToAscii(&certificate->subject), len);
+	else
+		ptr[0] = '\0';
+}
+
+void
+be_tls_get_peer_issuer_name(Port *port, char *ptr, size_t len)
+{
+	CERTCertificate *certificate;
+
+	certificate = SSL_PeerCertificate(port->pr_fd);
+	if (certificate)
+		strlcpy(ptr, CERT_NameToAscii(&certificate->issuer), len);
+	else
+		ptr[0] = '\0';
+}
+
+void
+be_tls_get_peer_serial(Port *port, char *ptr, size_t len)
+{
+	CERTCertificate *certificate;
+
+	certificate = SSL_PeerCertificate(port->pr_fd);
+	if (certificate)
+		snprintf(ptr, len, "%li", DER_GetInteger(&(certificate->serialNumber)));
+	else
+		ptr[0] = '\0';
+}
+
+char *
+be_tls_get_certificate_hash(Port *port, size_t *len)
+{
+	CERTCertificate *certificate;
+	SECOidTag	signature_tag;
+	SECOidTag	digest_alg;
+	int			digest_len;
+	SECStatus	status;
+	PLArenaPool *arena = NULL;
+	SECItem		digest;
+	char	   *ret;
+	PK11Context *ctx = NULL;
+	unsigned int outlen;
+
+	*len = 0;
+	certificate = SSL_LocalCertificate(port->pr_fd);
+	if (!certificate)
+		return NULL;
+
+	signature_tag = SECOID_GetAlgorithmTag(&certificate->signature);
+	if (!pg_find_signature_algorithm(signature_tag, &digest_alg, &digest_len))
+		elog(ERROR, "could not find digest for OID '%s'",
+			 SECOID_FindOIDTagDescription(signature_tag));
+
+	/*
+	 * The TLS server's certificate bytes need to be hashed with SHA-256 if
+	 * its signature algorithm is MD5 or SHA-1 as per RFC 5929
+	 * (https://tools.ietf.org/html/rfc5929#section-4.1).  If something else
+	 * is used, the same hash as the signature algorithm is used.
+	 */
+	if (digest_alg == SEC_OID_SHA1 || digest_alg == SEC_OID_MD5)
+	{
+		digest_alg = SEC_OID_SHA256;
+		digest_len = SHA256_LENGTH;
+	}
+
+	ctx = PK11_CreateDigestContext(digest_alg);
+	if (!ctx)
+		elog(ERROR, "out of memory");
+
+	arena = PORT_NewArena(SEC_ASN1_DEFAULT_ARENA_SIZE);
+	digest.data = PORT_ArenaZAlloc(arena, sizeof(unsigned char) * digest_len);
+	digest.len = digest_len;
+
+	status = SECSuccess;
+	status |= PK11_DigestBegin(ctx);
+	status |= PK11_DigestOp(ctx, certificate->derCert.data, certificate->derCert.len);
+	status |= PK11_DigestFinal(ctx, digest.data, &outlen, digest_len);
+
+	if (status != SECSuccess)
+	{
+		PORT_FreeArena(arena, PR_TRUE);
+		PK11_DestroyContext(ctx, PR_TRUE);
+		elog(ERROR, "could not generate server certificate hash");
+	}
+
+	ret = palloc(digest.len);
+	memcpy(ret, digest.data, digest.len);
+	*len = digest_len;
+
+	PORT_FreeArena(arena, PR_TRUE);
+	PK11_DestroyContext(ctx, PR_TRUE);
+
+	return ret;
+}
+
+/* ------------------------------------------------------------ */
+/*						Internal functions						*/
+/* ------------------------------------------------------------ */
+
+/*
+ * default_nss_tls_init
+ *
+ * The default TLS init hook function which users can override for installing
+ * their own passphrase callbacks and similar actions. In case no callback has
+ * been configured, or the callback isn't reload capable during a server
+ * reload, the dummy callback will be installed.
+ *
+ * The private data for the callback is set differently depending on how it's
+ * invoked. For calls which may invoke the callback deeper in the callstack
+ * the private data is set with SSL_SetPKCS11PinArg. When the call is directly
+ * invoking the callback, like PK11_FindCertFromNickname, then the private
+ * data is passed as a parameter. Setting the data with SSL_SetPKCS11PinArg is
+ * thus not required but good practice.
+ *
+ * NSS doesn't provide a default callback like OpenSSL does, but a callback is
+ * required to be set.  The password callback can be installed at any time, but
+ * setting the private data with SSL_SetPKCS11PinArg requires a PR Filedesc.
+ */
+static void
+default_nss_tls_init(bool isServerStart)
+{
+	/*
+	 * No user-defined callback has been configured, install the dummy call-
+	 * back since we must set something.
+	 */
+	if (!ssl_passphrase_command[0])
+		PK11_SetPasswordFunc(dummy_ssl_passphrase_cb);
+	else
+	{
+		/*
+		 * There is a user-defined callback, set it unless we are in a restart
+		 * and cannot handle restarts due to an interactive callback.
+		 */
+		if (isServerStart)
+			PK11_SetPasswordFunc(external_ssl_passphrase_cb);
+		else
+		{
+			if (ssl_passphrase_command_supports_reload)
+				PK11_SetPasswordFunc(external_ssl_passphrase_cb);
+			else
+				PK11_SetPasswordFunc(dummy_ssl_passphrase_cb);
+		}
+	}
+}
+
+/*
+ * external_ssl_passphrase_cb
+ *
+ * Runs the callback configured by ssl_passphrase_command and returns the
+ * captured password back to NSS.
+ */
+static char *
+external_ssl_passphrase_cb(PK11SlotInfo *slot, PRBool retry, void *arg)
+{
+	/*
+	 * NSS use a hardcoded 256 byte buffer for reading the password so set the
+	 * same limit for our callback buffer.
+	 */
+	char		buf[256];
+	int			len;
+	char	   *password = NULL;
+	char	   *prompt;
+
+	/*
+	 * Since there is no password callback in NSS when the server starts up,
+	 * it makes little sense to create an interactive callback. Thus, if this
+	 * is a retry attempt then give up immediately.
+	 */
+	if (retry)
+		return NULL;
+
+	/*
+	 * Construct the same prompt that NSS uses internally even though it is
+	 * unlikely to serve much purpose, but we must set a prompt so we might as
+	 * well do it right.
+	 */
+	prompt = psprintf("Enter Password or Pin for \"%s\":",
+					  PK11_GetTokenName(slot));
+
+	len = run_ssl_passphrase_command(prompt, ssl_is_server_start, buf, sizeof(buf));
+	pfree(prompt);
+
+	if (!len)
+		return NULL;
+
+	/*
+	 * At least one byte with password content was returned, and NSS requires
+	 * that we return it allocated in NSS controlled memory. If we fail to
+	 * allocate then abort without passing back NULL and bubble up the error
+	 * on the PG side.
+	 */
+	password = (char *) PR_Malloc(len + 1);
+	if (!password)
+	{
+		explicit_bzero(buf, sizeof(buf));
+		ereport(ERROR,
+				(errcode(ERRCODE_OUT_OF_MEMORY),
+				 errmsg("out of memory")));
+	}
+	strlcpy(password, buf, sizeof(password));
+	explicit_bzero(buf, sizeof(buf));
+
+	return password;
+}
+
+/*
+ * dummy_ssl_passphrase_cb
+ *
+ * Return unsuccessful if we are asked to provide the passphrase for a cert or
+ * key, without having a passphrase callback installed.
+ */
+static char *
+dummy_ssl_passphrase_cb(PK11SlotInfo *slot, PRBool retry, void *arg)
+{
+	dummy_ssl_passwd_cb_called = true;
+	return NULL;
+}
+
+static SECStatus
+pg_bad_cert_handler(void *arg, PRFileDesc *fd)
+{
+	Port	   *port = (Port *) arg;
+
+	port->peer_cert_valid = false;
+	return SECFailure;
+}
+
+/*
+ * raw_subject_common_name
+ *
+ * Returns the Subject Common Name for the given certificate as a raw char
+ * buffer (that is, without any form of escaping for unprintable characters or
+ * embedded nulls), with the length of the buffer returned in the len param.
+ * The buffer is allocated in the TopMemoryContext and is given a NULL
+ * terminator so that callers are safe to call strlen() on it.
+ *
+ * This is used instead of CERT_GetCommonName(), which always performs quoting
+ * and/or escaping. NSS doesn't appear to give us a way to easily unescape the
+ * result, and we need to store the raw CN into port->peer_cn for compatibility
+ * with the OpenSSL implementation.
+ */
+static char *
+raw_subject_common_name(CERTCertificate *cert, unsigned int *len)
+{
+	CERTName	subject = cert->subject;
+	CERTRDN	  **rdn;
+
+	for (rdn = subject.rdns; *rdn; rdn++)
+	{
+		CERTAVA	  **ava;
+
+		for (ava = (*rdn)->avas; *ava; ava++)
+		{
+			SECItem	   *buf;
+			char	   *cn;
+
+			if (CERT_GetAVATag(*ava) != SEC_OID_AVA_COMMON_NAME)
+				continue;
+
+			/* Found a CN, ecode and copy it into a newly allocated buffer */
+			buf = CERT_DecodeAVAValue(&(*ava)->value);
+			if (!buf)
+			{
+				/*
+				 * This failure case is difficult to test. (Since this code
+				 * runs after certificate authentication has otherwise
+				 * succeeded, you'd need to convince a CA implementation to
+				 * sign a corrupted certificate in order to get here.)
+				 *
+				 * Follow the behavior of CERT_GetCommonName() in this case and
+				 * simply return NULL, as if a Common Name had not been found.
+				 */
+				goto fail;
+			}
+
+			cn = MemoryContextAlloc(TopMemoryContext, buf->len + 1);
+			memcpy(cn, buf->data, buf->len);
+			cn[buf->len] = '\0';
+
+			*len = buf->len;
+
+			SECITEM_FreeItem(buf, PR_TRUE);
+			return cn;
+		}
+	}
+
+fail:
+	/* Not found. */
+	*len = 0;
+	return NULL;
+}
+
+/*
+ * pg_cert_auth_handler
+ *
+ * Callback for validation of incoming certificates. Returning SECFailure will
+ * cause NSS to terminate the connection immediately.
+ */
+static SECStatus
+pg_cert_auth_handler(void *arg, PRFileDesc *fd, PRBool checksig, PRBool isServer)
+{
+	SECStatus	status;
+	Port	   *port = (Port *) arg;
+	CERTCertificate *cert;
+	char	   *peer_cn;
+	unsigned int len;
+
+	status = SSL_AuthCertificate(CERT_GetDefaultCertDB(), port->pr_fd, checksig, PR_TRUE);
+	if (status != SECSuccess)
+		return status;
+
+	port->peer_cn = NULL;
+	port->peer_cert_valid = false;
+
+	cert = SSL_PeerCertificate(port->pr_fd);
+	if (!cert)
+	{
+		/* Shouldn't be possible; why did we get a client cert callback? */
+		Assert(cert != NULL);
+
+		PR_SetError(SEC_ERROR_LIBRARY_FAILURE, 0);
+		return SECFailure;
+	}
+
+	peer_cn = raw_subject_common_name(cert, &len);
+	if (!peer_cn)
+	{
+		/* No Common Name, but the certificate otherwise checks out. */
+		port->peer_cert_valid = true;
+
+		status = SECSuccess;
+		goto cleanup;
+	}
+
+	/*
+	 * Reject embedded NULLs in certificate common name to prevent attacks like
+	 * CVE-2009-4034.
+	 */
+	if (len != strlen(peer_cn))
+	{
+		ereport(COMMERROR,
+				(errcode(ERRCODE_PROTOCOL_VIOLATION),
+				 errmsg("SSL certificate's common name contains embedded null")));
+
+		pfree(peer_cn);
+		PR_SetError(SEC_ERROR_CERT_NOT_VALID, 0);
+
+		status = SECFailure;
+		goto cleanup;
+	}
+
+	port->peer_cn = peer_cn;
+	port->peer_cert_valid = true;
+
+	status = SECSuccess;
+
+cleanup:
+	CERT_DestroyCertificate(cert);
+	return status;
+}
+
+static PRInt32
+pg_ssl_read(PRFileDesc *fd, void *buf, PRInt32 amount, PRIntn flags,
+			PRIntervalTime timeout)
+{
+	PRRecvFN	read_fn;
+	PRInt32		n_read;
+
+	read_fn = fd->lower->methods->recv;
+	n_read = read_fn(fd->lower, buf, amount, flags, timeout);
+
+	return n_read;
+}
+
+static PRInt32
+pg_ssl_write(PRFileDesc *fd, const void *buf, PRInt32 amount, PRIntn flags,
+			 PRIntervalTime timeout)
+{
+	PRSendFN	send_fn;
+	PRInt32		n_write;
+
+	send_fn = fd->lower->methods->send;
+	n_write = send_fn(fd->lower, buf, amount, flags, timeout);
+
+	return n_write;
+}
+
+static PRStatus
+pg_ssl_close(PRFileDesc *fd)
+{
+	/*
+	 * Disconnect our private Port from the fd before closing out the stack.
+	 * (Debug builds of NSPR will assert if we do not.)
+	 */
+	fd->secret = NULL;
+	return PR_GetDefaultIOMethods()->close(fd);
+}
+
+static PRFileDesc *
+init_iolayer(Port *port)
+{
+	const		PRIOMethods *default_methods;
+	PRFileDesc *layer;
+
+	/*
+	 * Start by initializing our layer with all the default methods so that we
+	 * can selectively override the ones we want while still ensuring that we
+	 * have a complete layer specification.
+	 */
+	default_methods = PR_GetDefaultIOMethods();
+	memcpy(&pr_iomethods, default_methods, sizeof(PRIOMethods));
+
+	pr_iomethods.recv = pg_ssl_read;
+	pr_iomethods.send = pg_ssl_write;
+	pr_iomethods.close = pg_ssl_close;
+
+	/*
+	 * Each IO layer must be identified by a unique name, where uniqueness is
+	 * per connection. Each connection in a postgres cluster can generate the
+	 * identity from the same string as they will create their IO layers on
+	 * different sockets. Only one layer per socket can have the same name.
+	 */
+	pr_id = PR_GetUniqueIdentity("PostgreSQL Server");
+	if (pr_id == PR_INVALID_IO_LAYER)
+	{
+		ereport(ERROR,
+				(errmsg("out of memory when setting up TLS connection")));
+		return NULL;
+	}
+
+	/*
+	 * Create the actual IO layer as a stub such that it can be pushed onto
+	 * the layer stack. The step via a stub is required as we define custom
+	 * callbacks.
+	 */
+	layer = PR_CreateIOLayerStub(pr_id, &pr_iomethods);
+	if (!layer)
+	{
+		ereport(ERROR,
+				(errmsg("unable to create NSS I/O layer")));
+		return NULL;
+	}
+
+	/* Store the Port as private data available in callbacks */
+	layer->secret = (void *) port;
+
+	return layer;
+}
+
+static char *
+ssl_protocol_version_to_string(int v)
+{
+	switch (v)
+	{
+			/* SSL v2 and v3 are not supported */
+		case SSL_LIBRARY_VERSION_2:
+		case SSL_LIBRARY_VERSION_3_0:
+			Assert(false);
+			break;
+
+		case SSL_LIBRARY_VERSION_TLS_1_0:
+			return pstrdup("TLSv1.0");
+		case SSL_LIBRARY_VERSION_TLS_1_1:
+			return pstrdup("TLSv1.1");
+		case SSL_LIBRARY_VERSION_TLS_1_2:
+			return pstrdup("TLSv1.2");
+		case SSL_LIBRARY_VERSION_TLS_1_3:
+			return pstrdup("TLSv1.3");
+	}
+
+	return pstrdup("unknown");
+}
+
+
+/*
+ * ssl_protocol_version_to_nss
+ *			Translate PostgreSQL TLS version to NSS version
+ *
+ * Returns zero in case the requested TLS version is undefined (PG_ANY) and
+ * should be set by the caller, or -1 on failure.
+ */
+static uint16
+ssl_protocol_version_to_nss(int v, const char *guc_name)
+{
+	switch (v)
+	{
+			/*
+			 * There is no SSL_LIBRARY_ macro defined in NSS with the value
+			 * zero, so we use this to signal the caller that the highest
+			 * useful version should be set on the connection.
+			 */
+		case PG_TLS_ANY:
+			return 0;
+
+			/*
+			 * No guard is required here as there are no versions of NSS
+			 * without support for TLS1.
+			 */
+		case PG_TLS1_VERSION:
+			return SSL_LIBRARY_VERSION_TLS_1_0;
+		case PG_TLS1_1_VERSION:
+#ifdef SSL_LIBRARY_VERSION_TLS_1_1
+			return SSL_LIBRARY_VERSION_TLS_1_1;
+#else
+			break;
+#endif
+		case PG_TLS1_2_VERSION:
+#ifdef SSL_LIBRARY_VERSION_TLS_1_2
+			return SSL_LIBRARY_VERSION_TLS_1_2;
+#else
+			break;
+#endif
+		case PG_TLS1_3_VERSION:
+#ifdef SSL_LIBRARY_VERSION_TLS_1_3
+			return SSL_LIBRARY_VERSION_TLS_1_3;
+#else
+			break;
+#endif
+		default:
+			break;
+	}
+
+	return -1;
+}
+
+/*
+ * pg_SSLerrmessage
+ *		Create and return a human readable error message given
+ *		the specified error code
+ *
+ * PR_ErrorToName only converts the enum identifier of the error to string,
+ * but that can be quite useful for debugging (and in case PR_ErrorToString is
+ * unable to render a message then we at least have something).
+ */
+static char *
+pg_SSLerrmessage(PRErrorCode errcode)
+{
+	return psprintf("%s (%s)",
+					PR_ErrorToString(errcode, PR_LANGUAGE_I_DEFAULT),
+					PR_ErrorToName(errcode));
+}
+
+/*
+ * pg_SSLShutdownFunc
+ *		Callback for NSS shutdown
+ *
+ * If NSS is terminated from the outside when the connection is still in use
+ * we must treat this as potentially hostile and immediately close to avoid
+ * leaking the connection in any way. Once this is called, NSS will shutdown
+ * regardless so we may as well clean up the best we can. Returning SECFailure
+ * will cause the NSS shutdown to return with an error, but it will shutdown
+ * nevertheless. nss_data is reserved for future use and is always NULL.
+ */
+static SECStatus
+pg_SSLShutdownFunc(void *private_data, void *nss_data)
+{
+	Port *port = (Port *) private_data;
+
+	if (!port || !port->ssl_in_use)
+		return SECSuccess;
+
+	/*
+	 * There is a connection still open, close it and signal to whatever that
+	 * called the shutdown that it was erroneous.
+	 */
+	be_tls_close(port);
+	be_tls_destroy();
+
+	return SECFailure;
+}
diff --git a/src/backend/libpq/be-secure.c b/src/backend/libpq/be-secure.c
index d1545a2ad6..be583d7278 100644
--- a/src/backend/libpq/be-secure.c
+++ b/src/backend/libpq/be-secure.c
@@ -50,6 +50,9 @@ bool		ssl_passphrase_command_supports_reload;
 #ifdef USE_SSL
 bool		ssl_loaded_verify_locations = false;
 #endif
+#ifdef USE_NSS
+char	   *ssl_database;
+#endif
 
 /* GUC variable controlling SSL cipher list */
 char	   *SSLCipherSuites = NULL;
diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c
index d626731723..8504a404df 100644
--- a/src/backend/utils/misc/guc.c
+++ b/src/backend/utils/misc/guc.c
@@ -4308,7 +4308,11 @@ static struct config_string ConfigureNamesString[] =
 		},
 		&ssl_library,
 #ifdef USE_SSL
+#if defined(USE_OPENSSL)
 		"OpenSSL",
+#elif defined(USE_NSS)
+		"NSS",
+#endif
 #else
 		"",
 #endif
@@ -4376,6 +4380,18 @@ static struct config_string ConfigureNamesString[] =
 		check_canonical_path, assign_pgstat_temp_directory, NULL
 	},
 
+#ifdef USE_NSS
+	{
+		{"ssl_database", PGC_SIGHUP, CONN_AUTH_SSL,
+			gettext_noop("Location of the NSS certificate database."),
+			NULL
+		},
+		&ssl_database,
+		"",
+		NULL, NULL, NULL
+	},
+#endif
+
 	{
 		{"synchronous_standby_names", PGC_SIGHUP, REPLICATION_PRIMARY,
 			gettext_noop("Number of synchronous standbys and list of names of potential synchronous ones."),
@@ -4404,8 +4420,10 @@ static struct config_string ConfigureNamesString[] =
 			GUC_SUPERUSER_ONLY
 		},
 		&SSLCipherSuites,
-#ifdef USE_OPENSSL
+#if defined(USE_OPENSSL)
 		"HIGH:MEDIUM:+3DES:!aNULL",
+#elif defined (USE_NSS)
+		"",
 #else
 		"none",
 #endif
diff --git a/src/common/cipher_nss.c b/src/common/cipher_nss.c
new file mode 100644
index 0000000000..9799fef32d
--- /dev/null
+++ b/src/common/cipher_nss.c
@@ -0,0 +1,192 @@
+/*-------------------------------------------------------------------------
+ *
+ * cipher_nss.c
+ *	  NSS functionality shared between frontend and backend for working
+ *	  with ciphers
+ *
+ * This should only bse used if code is compiled with NSS support.
+ *
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ *        src/common/cipher_nss.c
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#ifndef FRONTEND
+#include "postgres.h"
+#else
+#include "postgres_fe.h"
+#endif
+
+#include "common/nss.h"
+
+#define INVALID_CIPHER	0xFFFF
+
+typedef struct
+{
+	SECOidTag	signature;
+	SECOidTag	hash;
+	int			len;
+}			NSSSignatureAlgorithm;
+
+static const NSSSignatureAlgorithm NSS_SCRAMDigestAlgorithm[] = {
+
+	{SEC_OID_PKCS1_MD5_WITH_RSA_ENCRYPTION, SEC_OID_SHA256, SHA256_LENGTH},
+	{SEC_OID_PKCS1_SHA1_WITH_RSA_ENCRYPTION, SEC_OID_SHA256, SHA256_LENGTH},
+	{SEC_OID_ISO_SHA_WITH_RSA_SIGNATURE, SEC_OID_SHA256, SHA256_LENGTH},
+	{SEC_OID_ISO_SHA1_WITH_RSA_SIGNATURE, SEC_OID_SHA256, SHA256_LENGTH},
+	{SEC_OID_PKCS5_PBE_WITH_MD5_AND_DES_CBC, SEC_OID_SHA256, SHA256_LENGTH},
+
+	{SEC_OID_ANSIX962_ECDSA_SHA224_SIGNATURE, SEC_OID_SHA224, SHA224_LENGTH},
+	{SEC_OID_PKCS1_SHA224_WITH_RSA_ENCRYPTION, SEC_OID_SHA224, SHA224_LENGTH},
+	{SEC_OID_NIST_DSA_SIGNATURE_WITH_SHA224_DIGEST, SEC_OID_SHA224, SHA224_LENGTH},
+
+	{SEC_OID_ANSIX962_ECDSA_SHA256_SIGNATURE, SEC_OID_SHA256, SHA256_LENGTH},
+	{SEC_OID_PKCS1_SHA256_WITH_RSA_ENCRYPTION, SEC_OID_SHA256, SHA256_LENGTH},
+	{SEC_OID_NIST_DSA_SIGNATURE_WITH_SHA256_DIGEST, SEC_OID_SHA256, SHA256_LENGTH},
+
+	{SEC_OID_ANSIX962_ECDSA_SHA384_SIGNATURE, SEC_OID_SHA384, SHA384_LENGTH},
+	{SEC_OID_PKCS1_SHA384_WITH_RSA_ENCRYPTION, SEC_OID_SHA384, SHA384_LENGTH},
+
+	{SEC_OID_ANSIX962_ECDSA_SHA512_SIGNATURE, SEC_OID_SHA512, SHA512_LENGTH},
+	{SEC_OID_PKCS1_SHA512_WITH_RSA_ENCRYPTION, SEC_OID_SHA512, SHA512_LENGTH},
+
+	{0, 0}
+};
+
+typedef struct
+{
+	const char *name;
+	PRUint16	number;
+}			NSSCiphers;
+
+/*
+ * This list is a partial copy of the ciphers in NSS files lib/ssl/sslproto.h
+ * in order to provide a human readable version of the ciphers. It would be
+ * nice to not have to have this, but NSS doesn't provide any API addressing
+ * the ciphers by name. TODO: do we want more of the ciphers, or perhaps less?
+ */
+static const NSSCiphers NSS_CipherList[] = {
+
+	{"TLS_NULL_WITH_NULL_NULL", TLS_NULL_WITH_NULL_NULL},
+
+	{"TLS_RSA_WITH_NULL_MD5", TLS_RSA_WITH_NULL_MD5},
+	{"TLS_RSA_WITH_NULL_SHA", TLS_RSA_WITH_NULL_SHA},
+	{"TLS_RSA_WITH_RC4_128_MD5", TLS_RSA_WITH_RC4_128_MD5},
+	{"TLS_RSA_WITH_RC4_128_SHA", TLS_RSA_WITH_RC4_128_SHA},
+	{"TLS_RSA_WITH_IDEA_CBC_SHA", TLS_RSA_WITH_IDEA_CBC_SHA},
+	{"TLS_RSA_WITH_DES_CBC_SHA", TLS_RSA_WITH_DES_CBC_SHA},
+	{"TLS_RSA_WITH_3DES_EDE_CBC_SHA", TLS_RSA_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_DH_DSS_WITH_DES_CBC_SHA", TLS_DH_DSS_WITH_DES_CBC_SHA},
+	{"TLS_DH_DSS_WITH_3DES_EDE_CBC_SHA", TLS_DH_DSS_WITH_3DES_EDE_CBC_SHA},
+	{"TLS_DH_RSA_WITH_DES_CBC_SHA", TLS_DH_RSA_WITH_DES_CBC_SHA},
+	{"TLS_DH_RSA_WITH_3DES_EDE_CBC_SHA", TLS_DH_RSA_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_DHE_DSS_WITH_DES_CBC_SHA", TLS_DHE_DSS_WITH_DES_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_3DES_EDE_CBC_SHA", TLS_DHE_DSS_WITH_3DES_EDE_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_DES_CBC_SHA", TLS_DHE_RSA_WITH_DES_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA", TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_DH_anon_WITH_RC4_128_MD5", TLS_DH_anon_WITH_RC4_128_MD5},
+	{"TLS_DH_anon_WITH_DES_CBC_SHA", TLS_DH_anon_WITH_DES_CBC_SHA},
+	{"TLS_DH_anon_WITH_3DES_EDE_CBC_SHA", TLS_DH_anon_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_RSA_WITH_AES_128_CBC_SHA", TLS_RSA_WITH_AES_128_CBC_SHA},
+	{"TLS_DH_DSS_WITH_AES_128_CBC_SHA", TLS_DH_DSS_WITH_AES_128_CBC_SHA},
+	{"TLS_DH_RSA_WITH_AES_128_CBC_SHA", TLS_DH_RSA_WITH_AES_128_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_AES_128_CBC_SHA", TLS_DHE_DSS_WITH_AES_128_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_AES_128_CBC_SHA", TLS_DHE_RSA_WITH_AES_128_CBC_SHA},
+	{"TLS_DH_anon_WITH_AES_128_CBC_SHA", TLS_DH_anon_WITH_AES_128_CBC_SHA},
+
+	{"TLS_RSA_WITH_AES_256_CBC_SHA", TLS_RSA_WITH_AES_256_CBC_SHA},
+	{"TLS_DH_DSS_WITH_AES_256_CBC_SHA", TLS_DH_DSS_WITH_AES_256_CBC_SHA},
+	{"TLS_DH_RSA_WITH_AES_256_CBC_SHA", TLS_DH_RSA_WITH_AES_256_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_AES_256_CBC_SHA", TLS_DHE_DSS_WITH_AES_256_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_AES_256_CBC_SHA", TLS_DHE_RSA_WITH_AES_256_CBC_SHA},
+	{"TLS_DH_anon_WITH_AES_256_CBC_SHA", TLS_DH_anon_WITH_AES_256_CBC_SHA},
+	{"TLS_RSA_WITH_NULL_SHA256", TLS_RSA_WITH_NULL_SHA256},
+	{"TLS_RSA_WITH_AES_128_CBC_SHA256", TLS_RSA_WITH_AES_128_CBC_SHA256},
+	{"TLS_RSA_WITH_AES_256_CBC_SHA256", TLS_RSA_WITH_AES_256_CBC_SHA256},
+
+	{"TLS_DHE_DSS_WITH_AES_128_CBC_SHA256", TLS_DHE_DSS_WITH_AES_128_CBC_SHA256},
+	{"TLS_RSA_WITH_CAMELLIA_128_CBC_SHA", TLS_RSA_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DH_DSS_WITH_CAMELLIA_128_CBC_SHA", TLS_DH_DSS_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DH_RSA_WITH_CAMELLIA_128_CBC_SHA", TLS_DH_RSA_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_CAMELLIA_128_CBC_SHA", TLS_DHE_DSS_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA", TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DH_anon_WITH_CAMELLIA_128_CBC_SHA", TLS_DH_anon_WITH_CAMELLIA_128_CBC_SHA},
+
+	{"TLS_DHE_DSS_WITH_RC4_128_SHA", TLS_DHE_DSS_WITH_RC4_128_SHA},
+	{"TLS_DHE_RSA_WITH_AES_128_CBC_SHA256", TLS_DHE_RSA_WITH_AES_128_CBC_SHA256},
+	{"TLS_DHE_DSS_WITH_AES_256_CBC_SHA256", TLS_DHE_DSS_WITH_AES_256_CBC_SHA256},
+	{"TLS_DHE_RSA_WITH_AES_256_CBC_SHA256", TLS_DHE_RSA_WITH_AES_256_CBC_SHA256},
+
+	{"TLS_RSA_WITH_CAMELLIA_256_CBC_SHA", TLS_RSA_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DH_DSS_WITH_CAMELLIA_256_CBC_SHA", TLS_DH_DSS_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DH_RSA_WITH_CAMELLIA_256_CBC_SHA", TLS_DH_RSA_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_CAMELLIA_256_CBC_SHA", TLS_DHE_DSS_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA", TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DH_anon_WITH_CAMELLIA_256_CBC_SHA", TLS_DH_anon_WITH_CAMELLIA_256_CBC_SHA},
+
+	{"TLS_RSA_WITH_SEED_CBC_SHA", TLS_RSA_WITH_SEED_CBC_SHA},
+
+	{"TLS_RSA_WITH_AES_128_GCM_SHA256", TLS_RSA_WITH_AES_128_GCM_SHA256},
+	{"TLS_RSA_WITH_AES_256_GCM_SHA384", TLS_RSA_WITH_AES_256_GCM_SHA384},
+	{"TLS_DHE_RSA_WITH_AES_128_GCM_SHA256", TLS_DHE_RSA_WITH_AES_128_GCM_SHA256},
+	{"TLS_DHE_RSA_WITH_AES_256_GCM_SHA384", TLS_DHE_RSA_WITH_AES_256_GCM_SHA384},
+	{"TLS_DHE_DSS_WITH_AES_128_GCM_SHA256", TLS_DHE_DSS_WITH_AES_128_GCM_SHA256},
+	{"TLS_DHE_DSS_WITH_AES_256_GCM_SHA384", TLS_DHE_DSS_WITH_AES_256_GCM_SHA384},
+
+	{"TLS_AES_128_GCM_SHA256", TLS_AES_128_GCM_SHA256},
+	{"TLS_AES_256_GCM_SHA384", TLS_AES_256_GCM_SHA384},
+	{"TLS_CHACHA20_POLY1305_SHA256", TLS_CHACHA20_POLY1305_SHA256},
+	{NULL, 0}
+};
+
+/*
+ * pg_find_cipher
+ *			Translate an NSS ciphername to the cipher code
+ *
+ * Searches the configured ciphers for the corresponding cipher code to the
+ * name. Search is performed case insensitive.
+ */
+bool
+pg_find_cipher(char *name, PRUint16 *cipher)
+{
+	const		NSSCiphers *cipher_list;
+
+	for (cipher_list = NSS_CipherList; cipher_list->name; cipher_list++)
+	{
+		if (pg_strcasecmp(cipher_list->name, name) == 0)
+		{
+			*cipher = cipher_list->number;
+			return true;
+		}
+	}
+
+	return false;
+}
+
+bool
+pg_find_signature_algorithm(SECOidTag signature, SECOidTag *algorithm, int *len)
+{
+	const NSSSignatureAlgorithm *candidate;
+
+	candidate = NSS_SCRAMDigestAlgorithm;
+
+	for (candidate = NSS_SCRAMDigestAlgorithm; candidate->signature; candidate++)
+	{
+		if (signature == candidate->signature)
+		{
+			*algorithm = candidate->hash;
+			*len = candidate->len;
+			return true;
+		}
+	}
+
+	return false;
+}
diff --git a/src/include/common/nss.h b/src/include/common/nss.h
new file mode 100644
index 0000000000..a361dd1f68
--- /dev/null
+++ b/src/include/common/nss.h
@@ -0,0 +1,49 @@
+/*-------------------------------------------------------------------------
+ *
+ * nss.h
+ *	  NSS supporting functionality shared between frontend and backend
+ *
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ *		  src/include/common/nss.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef COMMON_NSS_H
+#define COMMON_NSS_H
+
+#ifdef USE_NSS
+
+/*
+ * BITS_PER_BYTE is also defined in the NSPR header files, so we need to undef
+ * our version to avoid compiler warnings on redefinition.
+ */
+#define pg_BITS_PER_BYTE BITS_PER_BYTE
+#undef BITS_PER_BYTE
+/*
+ * The nspr/obsolete/protypes.h NSPR header typedefs uint64 and int64 with
+ * colliding definitions from ours, causing a much expected compiler error.
+ * Remove backwards compatibility with ancient NSPR versions to avoid this.
+ */
+#define NO_NSPR_10_SUPPORT
+#include <nspr/nspr.h>
+#include <nspr/prerror.h>
+#include <nspr/prio.h>
+#include <nspr/prmem.h>
+#include <nspr/prtypes.h>
+
+
+#include <nss/nss.h>
+#include <nss/hasht.h>
+#include <nss/secoidt.h>
+#include <nss/sslproto.h>
+
+/* src/common/cipher_nss.c */
+bool pg_find_cipher(char *name, PRUint16 *cipher);
+bool pg_find_signature_algorithm(SECOidTag signature, SECOidTag *digest, int *len);
+
+#endif							/* USE_NSS */
+
+#endif							/* COMMON_NSS_H */
diff --git a/src/include/libpq/libpq-be.h b/src/include/libpq/libpq-be.h
index 7be1a67d69..eb00d9152b 100644
--- a/src/include/libpq/libpq-be.h
+++ b/src/include/libpq/libpq-be.h
@@ -200,6 +200,10 @@ typedef struct Port
 	SSL		   *ssl;
 	X509	   *peer;
 #endif
+
+#ifdef USE_NSS
+	void	   *pr_fd;
+#endif
 } Port;
 
 #ifdef USE_SSL
@@ -283,7 +287,7 @@ extern void be_tls_get_peer_serial(Port *port, char *ptr, size_t len);
  * This is not supported with old versions of OpenSSL that don't have
  * the X509_get_signature_nid() function.
  */
-#if defined(USE_OPENSSL) && defined(HAVE_X509_GET_SIGNATURE_NID)
+#if defined(USE_NSS) || (defined(USE_OPENSSL) && defined(HAVE_X509_GET_SIGNATURE_NID))
 #define HAVE_BE_TLS_GET_CERTIFICATE_HASH
 extern char *be_tls_get_certificate_hash(Port *port, size_t *len);
 #endif
@@ -293,6 +297,10 @@ extern char *be_tls_get_certificate_hash(Port *port, size_t *len);
 typedef void (*openssl_tls_init_hook_typ) (SSL_CTX *context, bool isServerStart);
 extern PGDLLIMPORT openssl_tls_init_hook_typ openssl_tls_init_hook;
 #endif
+#ifdef USE_NSS
+typedef void (*nss_tls_init_hook_type) (bool isServerStart);
+extern PGDLLIMPORT nss_tls_init_hook_type nss_tls_init_hook;
+#endif
 
 #endif							/* USE_SSL */
 
diff --git a/src/include/libpq/libpq.h b/src/include/libpq/libpq.h
index b41b10620a..ff67d0d20d 100644
--- a/src/include/libpq/libpq.h
+++ b/src/include/libpq/libpq.h
@@ -89,6 +89,9 @@ extern PGDLLIMPORT bool ssl_passphrase_command_supports_reload;
 #ifdef USE_SSL
 extern bool ssl_loaded_verify_locations;
 #endif
+#ifdef USE_NSS
+extern char *ssl_database;
+#endif
 
 extern int	secure_initialize(bool isServerStart);
 extern bool secure_loaded_verify_locations(void);
diff --git a/src/include/pg_config_manual.h b/src/include/pg_config_manual.h
index f10ad0acd6..6e901beba1 100644
--- a/src/include/pg_config_manual.h
+++ b/src/include/pg_config_manual.h
@@ -178,7 +178,7 @@
  * USE_SSL code should be compiled only when compiling with an SSL
  * implementation.
  */
-#ifdef USE_OPENSSL
+#if defined(USE_OPENSSL) || defined(USE_NSS)
 #define USE_SSL
 #endif
 
diff --git a/src/interfaces/libpq/fe-connect.c b/src/interfaces/libpq/fe-connect.c
index db71fea169..40bc1cd348 100644
--- a/src/interfaces/libpq/fe-connect.c
+++ b/src/interfaces/libpq/fe-connect.c
@@ -359,6 +359,10 @@ static const internalPQconninfoOption PQconninfoOptions[] = {
 		"Target-Session-Attrs", "", 11, /* sizeof("read-write") = 11 */
 	offsetof(struct pg_conn, target_session_attrs)},
 
+	{"cert_database", NULL, NULL, NULL,
+		"CertificateDatabase", "", 64,
+	offsetof(struct pg_conn, cert_database)},
+
 	/* Terminating entry --- MUST BE LAST */
 	{NULL, NULL, NULL, NULL,
 	NULL, NULL, 0}
diff --git a/src/interfaces/libpq/fe-secure-nss.c b/src/interfaces/libpq/fe-secure-nss.c
new file mode 100644
index 0000000000..72b0c54d1c
--- /dev/null
+++ b/src/interfaces/libpq/fe-secure-nss.c
@@ -0,0 +1,1088 @@
+/*-------------------------------------------------------------------------
+ *
+ * fe-secure-nss.c
+ *	  functions for supporting NSS as a TLS backend for frontend libpq
+ *
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ *	  src/interfaces/libpq/fe-secure-nss.c
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#include "postgres_fe.h"
+
+#include "libpq-fe.h"
+#include "fe-auth.h"
+#include "fe-secure-common.h"
+#include "libpq-int.h"
+#include "common/nss.h"
+
+/*
+ * The nspr/obsolete/protypes.h NSPR header typedefs uint64 and int64 with
+ * colliding definitions from ours, causing a much expected compiler error.
+ * Remove backwards compatibility with ancient NSPR versions to avoid this.
+ */
+#define NO_NSPR_10_SUPPORT
+#include <nspr/nspr.h>
+#include <nspr/prerror.h>
+#include <nspr/prinit.h>
+#include <nspr/prio.h>
+
+#include <nss/hasht.h>
+#include <nss/nss.h>
+#include <nss/ssl.h>
+#include <nss/sslproto.h>
+#include <nss/pk11func.h>
+#include <nss/secerr.h>
+#include <nss/secoidt.h>
+#include <nss/secmod.h>
+
+static SECStatus pg_load_nss_module(SECMODModule **module, const char *library, const char *name);
+static SECStatus pg_bad_cert_handler(void *arg, PRFileDesc *fd);
+static const char *pg_SSLerrmessage(PRErrorCode errcode);
+static SECStatus pg_client_auth_handler(void *arg, PRFileDesc *socket, CERTDistNames *caNames,
+										CERTCertificate **pRetCert, SECKEYPrivateKey **pRetKey);
+static SECStatus pg_cert_auth_handler(void *arg, PRFileDesc *fd, PRBool checksig, PRBool isServer);
+static int	ssl_protocol_version_to_nss(const char *protocol);
+static bool cert_database_has_CA(PGconn *conn);
+
+static char *PQssl_passwd_cb(PK11SlotInfo *slot, PRBool retry, void *arg);
+
+/*
+ * PR_ImportTCPSocket() is a private API, but very widely used, as it's the
+ * only way to make NSS use an already set up POSIX file descriptor rather
+ * than opening one itself. To quote the NSS documentation:
+ *
+ *		"In theory, code that uses PR_ImportTCPSocket may break when NSPR's
+ *		implementation changes. In practice, this is unlikely to happen because
+ *		NSPR's implementation has been stable for years and because of NSPR's
+ *		strong commitment to backward compatibility."
+ *
+ * https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSPR/Reference/PR_ImportTCPSocket
+ *
+ * The function is declared in <private/pprio.h>, but as it is a header marked
+ * private we declare it here rather than including it.
+ */
+NSPR_API(PRFileDesc *) PR_ImportTCPSocket(int);
+
+static SECMODModule *ca_trust = NULL;
+
+/*
+ * This logic exist in NSS as well, but it's only available for when there is
+ * a database to open, and not only using the system trust store. Thus, we
+ * need to keep our own copy.
+ */
+#if defined(WIN32)
+static const char *ca_trust_name = "nssckbi.dll";
+#elif defined(__darwin__)
+static const char *ca_trust_name = "libnssckbi.dylib";
+#else
+static const char *ca_trust_name = "libnssckbi.so";
+#endif
+
+static PQsslKeyPassHook_nss_type PQsslKeyPassHook = NULL;
+
+/* ------------------------------------------------------------ */
+/*			 Procedures common to all secure sessions			*/
+/* ------------------------------------------------------------ */
+
+/*
+ * pgtls_init_library
+ *
+ * There is no direct equivalent for PQinitOpenSSL in NSS/NSPR, with PR_Init
+ * being the closest match there is. PR_Init is however already documented to
+ * not be required so simply making this a noop seems like the best option.
+ */
+void
+pgtls_init_library(bool do_ssl, int do_crypto)
+{
+	/* noop */
+}
+
+int
+pgtls_init(PGconn *conn)
+{
+	conn->nss_context = NULL;
+
+	conn->ssl_in_use = false;
+	conn->has_password = false;
+
+	return 0;
+}
+
+void
+pgtls_close(PGconn *conn)
+{
+	if (conn->nss_context)
+	{
+		NSS_ShutdownContext(conn->nss_context);
+		conn->nss_context = NULL;
+	}
+}
+
+PostgresPollingStatusType
+pgtls_open_client(PGconn *conn)
+{
+	SECStatus	status;
+	PRFileDesc *pr_fd;
+	PRFileDesc *model;
+	NSSInitParameters params;
+	SSLVersionRange desired_range;
+
+	/*
+	 * The NSPR documentation states that runtime initialization via PR_Init
+	 * is no longer required, as the first caller into NSPR will perform the
+	 * initialization implicitly. See be-secure-nss.c for further discussion
+	 * on PR_Init.
+	 */
+	PR_Init(PR_USER_THREAD, PR_PRIORITY_NORMAL, 0);
+
+	/*
+	 * NSS initialization and the use of contexts is further discussed in
+	 * be-secure-nss.c
+	 */
+	memset(&params, 0, sizeof(params));
+	params.length = sizeof(params);
+
+	if (conn->cert_database && strlen(conn->cert_database) > 0)
+	{
+		char	   *cert_database_path = psprintf("sql:%s", conn->cert_database);
+
+		conn->nss_context = NSS_InitContext(cert_database_path, "", "", "",
+											&params,
+											NSS_INIT_READONLY | NSS_INIT_PK11RELOAD);
+		pfree(cert_database_path);
+
+		if (!conn->nss_context)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("unable to open certificate database \"%s\": %s"),
+							  conn->cert_database,
+							  pg_SSLerrmessage(PR_GetError()));
+			return PGRES_POLLING_FAILED;
+		}
+	}
+	else
+	{
+		conn->nss_context = NSS_InitContext("", "", "", "", &params,
+											NSS_INIT_READONLY | NSS_INIT_NOCERTDB |
+											NSS_INIT_NOMODDB | NSS_INIT_FORCEOPEN |
+											NSS_INIT_NOROOTINIT | NSS_INIT_PK11RELOAD);
+		if (!conn->nss_context)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("unable to create certificate database: %s"),
+							  pg_SSLerrmessage(PR_GetError()));
+			return PGRES_POLLING_FAILED;
+		}
+	}
+
+	/*
+	 * Configure cipher policy.
+	 */
+	status = NSS_SetDomesticPolicy();
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to configure cipher policy: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * If we don't have a certificate database, the system trust store is the
+	 * fallback we can use. If we fail to initialize that as well, we can
+	 * still attempt a connection as long as the sslmode isn't verify*.
+	 */
+	if (!conn->cert_database && conn->sslmode[0] == 'v')
+	{
+		status = pg_load_nss_module(&ca_trust, ca_trust_name, "\"Root Certificates\"");
+		if (status != SECSuccess)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("WARNING: unable to load NSS trust module \"%s\" : %s"),
+							  ca_trust_name,
+							  pg_SSLerrmessage(PR_GetError()));
+
+			return PGRES_POLLING_FAILED;
+		}
+	}
+
+
+	PK11_SetPasswordFunc(PQssl_passwd_cb);
+
+	/*
+	 * Import the already opened socket as we don't want to use NSPR functions
+	 * for opening the network socket due to how the PostgreSQL protocol works
+	 * with TLS connections. This function is not part of the NSPR public API,
+	 * see the comment at the top of the file for the rationale of still using
+	 * it.
+	 */
+	pr_fd = PR_ImportTCPSocket(conn->sock);
+	if (!pr_fd)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to attach to socket: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * Most of the documentation available, and implementations of, NSS/NSPR
+	 * use the PR_NewTCPSocket() function here, which has the drawback that it
+	 * can only create IPv4 sockets. Instead use PR_OpenTCPSocket() which
+	 * copes with IPv6 as well.
+	 */
+	model = SSL_ImportFD(NULL, PR_OpenTCPSocket(conn->laddr.addr.ss_family));
+	if (!model)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to enable TLS: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/* Disable old protocol versions (SSLv2 and SSLv3) */
+	SSL_OptionSet(model, SSL_ENABLE_SSL2, PR_FALSE);
+	SSL_OptionSet(model, SSL_V2_COMPATIBLE_HELLO, PR_FALSE);
+	SSL_OptionSet(model, SSL_ENABLE_SSL3, PR_FALSE);
+
+#ifdef SSL_CBC_RANDOM_IV
+
+	/*
+	 * Enable protection against the BEAST attack in case the NSS library has
+	 * support for that. While SSLv3 is disabled, we may still allow TLSv1
+	 * which is affected. The option isn't documented as an SSL option, but as
+	 * an NSS environment variable.
+	 */
+	SSL_OptionSet(model, SSL_CBC_RANDOM_IV, PR_TRUE);
+#endif
+
+	/* Set us up as a TLS client for the handshake */
+	SSL_OptionSet(model, SSL_HANDSHAKE_AS_CLIENT, PR_TRUE);
+
+	/*
+	 * When setting the available protocols, we either use the user defined
+	 * configuration values, and if missing we accept whatever is the highest
+	 * version supported by the library as the max and only limit the range in
+	 * the other end at TLSv1.0. ssl_variant_stream is a ProtocolVariant enum
+	 * for Stream protocols, rather than datagram.
+	 */
+	SSL_VersionRangeGetSupported(ssl_variant_stream, &desired_range);
+	desired_range.min = SSL_LIBRARY_VERSION_TLS_1_0;
+
+	if (conn->ssl_min_protocol_version && strlen(conn->ssl_min_protocol_version) > 0)
+	{
+		int			ssl_min_ver = ssl_protocol_version_to_nss(conn->ssl_min_protocol_version);
+
+		if (ssl_min_ver == -1)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("invalid value \"%s\" for minimum version of SSL protocol\n"),
+							  conn->ssl_min_protocol_version);
+			return -1;
+		}
+
+		desired_range.min = ssl_min_ver;
+	}
+
+	if (conn->ssl_max_protocol_version && strlen(conn->ssl_max_protocol_version) > 0)
+	{
+		int			ssl_max_ver = ssl_protocol_version_to_nss(conn->ssl_max_protocol_version);
+
+		if (ssl_max_ver == -1)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("invalid value \"%s\" for maximum version of SSL protocol\n"),
+							  conn->ssl_max_protocol_version);
+			return -1;
+		}
+
+		desired_range.max = ssl_max_ver;
+	}
+
+	if (SSL_VersionRangeSet(model, &desired_range) != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to set allowed SSL protocol version range: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * Set up callback for verifying server certificates, as well as for how
+	 * to handle failed verifications.
+	 */
+	SSL_AuthCertificateHook(model, pg_cert_auth_handler, (void *) conn);
+	SSL_BadCertHook(model, pg_bad_cert_handler, (void *) conn);
+
+	/*
+	 * Convert the NSPR socket to an SSL socket. Ensuring the success of this
+	 * operation is critical as NSS SSL_* functions may return SECSuccess on
+	 * the socket even though SSL hasn't been enabled, which introduce a risk
+	 * of silent downgrades.
+	 */
+	conn->pr_fd = SSL_ImportFD(model, pr_fd);
+	if (!conn->pr_fd)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to configure client for TLS: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * The model can now we closed as we've applied the settings of the model
+	 * onto the real socket. From hereon we should only use conn->pr_fd.
+	 */
+	PR_Close(model);
+
+	/* Set the private data to be passed to the password callback */
+	SSL_SetPKCS11PinArg(conn->pr_fd, (void *) conn);
+
+	status = SSL_ResetHandshake(conn->pr_fd, PR_FALSE);
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to initiate handshake: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/* Set callback for client authentication when requested by the server */
+	SSL_GetClientAuthDataHook(conn->pr_fd, pg_client_auth_handler, (void *) conn);
+
+	/*
+	 * Specify which hostname we are expecting to talk to. This is required,
+	 * albeit mostly applies to when opening a connection to a traditional
+	 * http server it seems.
+	 */
+	SSL_SetURL(conn->pr_fd, (conn->connhost[conn->whichhost]).host);
+
+	do
+	{
+		status = SSL_ForceHandshake(conn->pr_fd);
+	}
+	while (status != SECSuccess && PR_GetError() == PR_WOULD_BLOCK_ERROR);
+
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("SSL error: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	conn->ssl_in_use = true;
+	return PGRES_POLLING_OK;
+}
+
+ssize_t
+pgtls_read(PGconn *conn, void *ptr, size_t len)
+{
+	PRInt32		nread;
+	PRErrorCode status;
+	int			read_errno = 0;
+
+	/*
+	 * PR_Recv blocks until there is data to read or the timeout expires. We
+	 * don't want to sit blocked here, so the timeout is turned off by using
+	 * PR_INTERVAL_NO_WAIT which means "return immediately",  Zero is returned
+	 * for closed connections, while -1 indicates an error within the ongoing
+	 * connection.
+	 */
+	nread = PR_Recv(conn->pr_fd, ptr, len, 0, PR_INTERVAL_NO_WAIT);
+
+	if (nread == 0)
+	{
+		read_errno = ECONNRESET;
+		nread = -1;
+	}
+	else if (nread == -1)
+	{
+		status = PR_GetError();
+
+		switch (status)
+		{
+			case PR_IO_TIMEOUT_ERROR:
+				/* No data available yet. */
+				nread = 0;
+				break;
+
+			case PR_WOULD_BLOCK_ERROR:
+				read_errno = EWOULDBLOCK;
+				break;
+
+				/*
+				 * The error cases for PR_Recv are not documented, but can be
+				 * reverse engineered from _MD_unix_map_default_error() in the
+				 * NSPR code, defined in pr/src/md/unix/unix_errors.c.
+				 */
+			case PR_NETWORK_UNREACHABLE_ERROR:
+			case PR_CONNECT_RESET_ERROR:
+				read_errno = ECONNRESET;
+				break;
+
+			default:
+				break;
+		}
+
+		if (nread == -1)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("TLS read error: %s"),
+							  pg_SSLerrmessage(status));
+		}
+	}
+
+	SOCK_ERRNO_SET(read_errno);
+	return (ssize_t) nread;
+}
+
+/*
+ * pgtls_read_pending
+ *		Check for the existence of data to be read.
+ *
+ * This is part of the PostgreSQL TLS backend API.
+ */
+bool
+pgtls_read_pending(PGconn *conn)
+{
+	unsigned char c;
+	int			n;
+
+	/*
+	 * PR_Recv peeks into the stream with the timeount turned off, to see if
+	 * there is another byte to read off the wire. There is an NSS function
+	 * SSL_DataPending() which might seem like a better fit, but it will only
+	 * check already encrypted data in the SSL buffer, not still unencrypted
+	 * data, thus it doesn't guarantee that a subsequent call to
+	 * PR_Read/PR_Recv won't block.
+	 */
+	n = PR_Recv(conn->pr_fd, &c, 1, PR_MSG_PEEK, PR_INTERVAL_NO_WAIT);
+	return (n > 0);
+}
+
+ssize_t
+pgtls_write(PGconn *conn, const void *ptr, size_t len)
+{
+	PRInt32		n;
+	PRErrorCode status;
+	int			write_errno = 0;
+
+	n = PR_Write(conn->pr_fd, ptr, len);
+
+	if (n < 0)
+	{
+		status = PR_GetError();
+
+		switch (status)
+		{
+			case PR_WOULD_BLOCK_ERROR:
+#ifdef EAGAIN
+				write_errno = EAGAIN;
+#else
+				write_errno = EINTR;
+#endif
+				break;
+
+			default:
+				printfPQExpBuffer(&conn->errorMessage,
+								  libpq_gettext("TLS write error: %s"),
+								  pg_SSLerrmessage(status));
+				write_errno = ECONNRESET;
+				break;
+		}
+	}
+
+	SOCK_ERRNO_SET(write_errno);
+	return (ssize_t) n;
+}
+
+char *
+pgtls_get_peer_certificate_hash(PGconn *conn, size_t *len)
+{
+	CERTCertificate *server_cert;
+	SECOidTag	signature_tag;
+	SECOidTag	digest_alg;
+	int			digest_len;
+	PLArenaPool *arena;
+	SECItem		digest;
+	char	   *ret;
+	SECStatus	status;
+
+	*len = 0;
+
+	server_cert = SSL_PeerCertificate(conn->pr_fd);
+	if (!server_cert)
+		return NULL;
+
+	signature_tag = SECOID_GetAlgorithmTag(&server_cert->signature);
+	if (!pg_find_signature_algorithm(signature_tag, &digest_alg, &digest_len))
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("could not find digest for OID '%s'\n"),
+						  SECOID_FindOIDTagDescription(signature_tag));
+		return NULL;
+	}
+
+	arena = PORT_NewArena(SEC_ASN1_DEFAULT_ARENA_SIZE);
+	digest.data = PORT_ArenaZAlloc(arena, sizeof(unsigned char) * digest_len);
+	digest.len = digest_len;
+
+	status = PK11_HashBuf(digest_alg, digest.data, server_cert->derCert.data,
+						  server_cert->derCert.len);
+
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to generate peer certificate digest: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		PORT_FreeArena(arena, PR_TRUE);
+		return NULL;
+	}
+
+	ret = pg_malloc(digest.len);
+	memcpy(ret, digest.data, digest.len);
+	*len = digest_len;
+	PORT_FreeArena(arena, PR_TRUE);
+
+	return ret;
+}
+
+/*
+ *	Verify that the server certificate matches the hostname we connected to.
+ *
+ * The certificate's Common Name and Subject Alternative Names are considered.
+ */
+int
+pgtls_verify_peer_name_matches_certificate_guts(PGconn *conn,
+												int *names_examined,
+												char **first_name)
+{
+	char	   *server_hostname = NULL;
+	CERTCertificate *server_cert = NULL;
+	SECStatus	status = SECSuccess;
+	SECItem		altname_item;
+	PLArenaPool *arena = NULL;
+	CERTGeneralName *san_list;
+	CERTGeneralName *cn;
+
+	server_hostname = SSL_RevealURL(conn->pr_fd);
+	if (!server_hostname || server_hostname[0] == '\0')
+		goto done;
+
+	/*
+	 * CERT_VerifyCertName will internally perform RFC 2818 SubjectAltName
+	 * verification.
+	 */
+	server_cert = SSL_PeerCertificate(conn->pr_fd);
+	status = CERT_VerifyCertName(server_cert, server_hostname);
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to verify server hostname: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		goto done;
+	}
+
+	status = CERT_FindCertExtension(server_cert, SEC_OID_X509_SUBJECT_ALT_NAME,
+									&altname_item);
+	if (status == SECSuccess)
+	{
+		arena = PORT_NewArena(DER_DEFAULT_CHUNKSIZE);
+		if (!arena)
+		{
+			status = SECFailure;
+			goto done;
+		}
+		san_list = CERT_DecodeAltNameExtension(arena, &altname_item);
+		if (!san_list)
+		{
+			status = SECFailure;
+			goto done;
+		}
+
+		for (cn = san_list; cn != san_list; cn = CERT_GetNextGeneralName(cn))
+		{
+			char	   *alt_name;
+			int			rv;
+			char		tmp[512];
+
+			status = CERT_RFC1485_EscapeAndQuote(tmp, sizeof(tmp),
+												 (char *) cn->name.other.data,
+												 cn->name.other.len);
+
+			if (status != SECSuccess)
+				goto done;
+
+			rv = pq_verify_peer_name_matches_certificate_name(conn, tmp,
+															  strlen(tmp),
+															  &alt_name);
+			if (alt_name)
+			{
+				if (!*first_name)
+					*first_name = alt_name;
+				else
+					free(alt_name);
+			}
+
+			if (rv == 1)
+				status = SECSuccess;
+			else
+			{
+				status = SECFailure;
+				break;
+			}
+		}
+	}
+	else if (PORT_GetError() == SEC_ERROR_EXTENSION_NOT_FOUND)
+		status = SECSuccess;
+	else
+		status = SECSuccess;
+
+done:
+	/* san_list will be freed by freeing the arena it was allocated in */
+	if (arena)
+		PORT_FreeArena(arena, PR_TRUE);
+	PR_Free(server_hostname);
+
+	if (status == SECSuccess)
+		return 1;
+
+	return 0;
+}
+
+/* ------------------------------------------------------------ */
+/*			PostgreSQL specific TLS support functions			*/
+/* ------------------------------------------------------------ */
+
+static const char *
+pg_SSLerrmessage(PRErrorCode errcode)
+{
+	const char *error;
+
+	/*
+	 * Try to get the user friendly error description, and if that fails try
+	 * to fall back on the name of the PRErrorCode.
+	 */
+	error = PR_ErrorToString(errcode, PR_LANGUAGE_I_DEFAULT);
+	if (!error)
+		error = PR_ErrorToName(errcode);
+	if (error)
+		return error;
+
+	return "unknown TLS error";
+}
+
+static SECStatus
+pg_load_nss_module(SECMODModule **module, const char *library, const char *name)
+{
+	SECMODModule *mod;
+	char	   *modulespec;
+
+	modulespec = psprintf("library=\"%s\", name=\"%s\"", library, name);
+
+	/*
+	 * Attempt to load the specified module. The second parameter is "parent"
+	 * which should always be NULL for application code. The third parameter
+	 * defines if loading should recurse which is only applicable when loading
+	 * a module from within another module. This hierarchy would have to be
+	 * defined in the modulespec, and since we don't support anything but
+	 * directly addressed modules we should pass PR_FALSE.
+	 */
+	mod = SECMOD_LoadUserModule(modulespec, NULL, PR_FALSE);
+	pfree(modulespec);
+
+	if (mod && mod->loaded)
+	{
+		*module = mod;
+		return SECSuccess;
+	}
+
+	SECMOD_DestroyModule(mod);
+	return SECFailure;
+}
+
+/* ------------------------------------------------------------ */
+/*						NSS Callbacks							*/
+/* ------------------------------------------------------------ */
+
+/*
+ * pg_cert_auth_handler
+ *			Callback for authenticating server certificate
+ *
+ * This is pretty much the same procedure as the SSL_AuthCertificate function
+ * provided by NSS, with the difference being server hostname validation. With
+ * SSL_AuthCertificate there is no way to do verify-ca, it only does the -full
+ * flavor of our sslmodes, so we need our own implementation.
+ */
+static SECStatus
+pg_cert_auth_handler(void *arg, PRFileDesc *fd, PRBool checksig, PRBool isServer)
+{
+	SECStatus	status;
+	PGconn	   *conn = (PGconn *) arg;
+	CERTCertificate *server_cert;
+	void	   *pin;
+
+	Assert(!isServer);
+
+	pin = SSL_RevealPinArg(conn->pr_fd);
+	server_cert = SSL_PeerCertificate(conn->pr_fd);
+
+	/*
+	 * VerifyCertificateNow verifies the validity using PR_now from NSPR as a
+	 * timestamp and will perform CRL and OSCP revocation checks. conn->sslcrl
+	 * does not impact NSS connections as any CRL in the NSS database will be
+	 * used automatically.
+	 */
+	status = CERT_VerifyCertificateNow((CERTCertDBHandle *) CERT_GetDefaultCertDB(),
+									   server_cert,
+									   checksig,
+									   certificateUsageSSLServer,
+									   pin,
+									   NULL);
+
+	/*
+	 * If we've already failed validation then there is no point in also
+	 * performing the hostname check for verify-full.
+	 */
+	if (status == SECSuccess)
+	{
+		if (!pq_verify_peer_name_matches_certificate(conn))
+			status = SECFailure;
+	}
+	else
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to verify certificate: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+	}
+
+	return status;
+}
+
+/*
+ * pg_client_auth_handler
+ *		Callback for client certificate validation
+ *
+ * The client auth callback is not on by default in NSS, so we need to invoke
+ * it ourselves to ensure we can do cert authentication. A TODO is to support
+ * running without a specified sslcert parameter. By retrieving all the certs
+ * via nickname from the cert database and see if we find one which apply with
+ * NSS_CmpCertChainWCANames() and PK11_FindKeyByAnyCert() we could support
+ * just running with a ssl database specified.
+ *
+ * For now, we use the default client certificate validation which requires a
+ * defined nickname to identify the cert in the database.
+ */
+static SECStatus
+pg_client_auth_handler(void *arg, PRFileDesc *socket, CERTDistNames *caNames,
+					   CERTCertificate **pRetCert, SECKEYPrivateKey **pRetKey)
+{
+	PGconn	   *conn = (PGconn *) arg;
+
+	return NSS_GetClientAuthData(conn->sslcert, socket, caNames, pRetCert, pRetKey);
+}
+
+/*
+ * pg_bad_cert_handler
+ *		Callback for failed certificate validation
+ *
+ * The TLS handshake will call this function iff the server certificate failed
+ * validation. Depending on the sslmode, we allow the connection anyways.
+ */
+static SECStatus
+pg_bad_cert_handler(void *arg, PRFileDesc *fd)
+{
+	PGconn	   *conn = (PGconn *) arg;
+	PRErrorCode err;
+
+	/*
+	 * This really shouldn't happen, as we've set the PGconn object as our
+	 * callback data, and at the callsite we know it will be populated. That
+	 * being said, the NSS code itself performs this check even when it should
+	 * not be required so let's use the same belts with our suspenders.
+	 */
+	if (!arg)
+		return SECFailure;
+
+	/*
+	 * For sslmodes other than verify-full and verify-ca we don't perform peer
+	 * validation, so return immediately.  sslmode require with a database
+	 * specified which contains a CA certificate will work like verify-ca to
+	 * be compatible with the OpenSSL implementation.
+	 */
+	if (strcmp(conn->sslmode, "require") == 0)
+	{
+		if (conn->cert_database &&
+			strlen(conn->cert_database) > 0 &&
+			cert_database_has_CA(conn))
+			return SECFailure;
+	}
+	if (conn->sslmode[0] == 'v')
+		return SECFailure;
+
+	err = PORT_GetError();
+
+	/*
+	 * TODO: these are relevant error codes that can occur in certificate
+	 * validation, figure out which we don't want for require/prefer etc.
+	 */
+	switch (err)
+	{
+		case SEC_ERROR_INVALID_AVA:
+		case SEC_ERROR_INVALID_TIME:
+		case SEC_ERROR_BAD_SIGNATURE:
+		case SEC_ERROR_EXPIRED_CERTIFICATE:
+		case SEC_ERROR_UNKNOWN_ISSUER:
+		case SEC_ERROR_UNTRUSTED_ISSUER:
+		case SEC_ERROR_UNTRUSTED_CERT:
+		case SEC_ERROR_CERT_VALID:
+		case SEC_ERROR_EXPIRED_ISSUER_CERTIFICATE:
+		case SEC_ERROR_CRL_EXPIRED:
+		case SEC_ERROR_CRL_BAD_SIGNATURE:
+		case SEC_ERROR_EXTENSION_VALUE_INVALID:
+		case SEC_ERROR_CA_CERT_INVALID:
+		case SEC_ERROR_CERT_USAGES_INVALID:
+		case SEC_ERROR_UNKNOWN_CRITICAL_EXTENSION:
+			return SECSuccess;
+			break;
+		default:
+			return SECFailure;
+			break;
+	}
+
+	/* Unreachable */
+	return SECSuccess;
+}
+
+/* ------------------------------------------------------------ */
+/*					SSL information functions					*/
+/* ------------------------------------------------------------ */
+
+/*
+ * PQgetssl
+ *
+ * Return NULL as this is legacy and defined to always be equal to calling
+ * PQsslStruct(conn, "OpenSSL"); This should ideally trigger a logged warning
+ * somewhere as it's nonsensical to run in a non-OpenSSL build.
+ */
+void *
+PQgetssl(PGconn *conn)
+{
+	return NULL;
+}
+
+void *
+PQsslStruct(PGconn *conn, const char *struct_name)
+{
+	if (!conn)
+		return NULL;
+
+	/*
+	 * Return the underlying PRFileDesc which can be used to access
+	 * information on the connection details. There is no SSL context per se.
+	 */
+	if (strcmp(struct_name, "NSS") == 0)
+		return conn->pr_fd;
+	return NULL;
+}
+
+const char *const *
+PQsslAttributeNames(PGconn *conn)
+{
+	static const char *const result[] = {
+		"library",
+		"cipher",
+		"protocol",
+		"key_bits",
+		"compression",
+		NULL
+	};
+
+	return result;
+}
+
+const char *
+PQsslAttribute(PGconn *conn, const char *attribute_name)
+{
+	SECStatus	status;
+	SSLChannelInfo channel;
+	SSLCipherSuiteInfo suite;
+
+	if (!conn || !conn->pr_fd)
+		return NULL;
+
+	if (strcmp(attribute_name, "library") == 0)
+		return "NSS";
+
+	status = SSL_GetChannelInfo(conn->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+		return NULL;
+
+	status = SSL_GetCipherSuiteInfo(channel.cipherSuite, &suite, sizeof(suite));
+	if (status != SECSuccess)
+		return NULL;
+
+	if (strcmp(attribute_name, "cipher") == 0)
+		return suite.cipherSuiteName;
+
+	if (strcmp(attribute_name, "key_bits") == 0)
+	{
+		static char key_bits_str[8];
+
+		snprintf(key_bits_str, sizeof(key_bits_str), "%i", suite.effectiveKeyBits);
+		return key_bits_str;
+	}
+
+	if (strcmp(attribute_name, "protocol") == 0)
+	{
+		switch (channel.protocolVersion)
+		{
+#ifdef SSL_LIBRARY_VERSION_TLS_1_3
+			case SSL_LIBRARY_VERSION_TLS_1_3:
+				return "TLSv1.3";
+#endif
+#ifdef SSL_LIBRARY_VERSION_TLS_1_2
+			case SSL_LIBRARY_VERSION_TLS_1_2:
+				return "TLSv1.2";
+#endif
+#ifdef SSL_LIBRARY_VERSION_TLS_1_1
+			case SSL_LIBRARY_VERSION_TLS_1_1:
+				return "TLSv1.1";
+#endif
+			case SSL_LIBRARY_VERSION_TLS_1_0:
+				return "TLSv1.0";
+			default:
+				return "unknown";
+		}
+	}
+
+	/*
+	 * NSS disabled support for compression in version 3.33, and it was only
+	 * available for SSLv3 at that point anyways, so we can safely return off
+	 * here without checking.
+	 */
+	if (strcmp(attribute_name, "compression") == 0)
+		return "off";
+
+	return NULL;
+}
+
+static int
+ssl_protocol_version_to_nss(const char *protocol)
+{
+	if (pg_strcasecmp("TLSv1", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_0;
+
+#ifdef SSL_LIBRARY_VERSION_TLS_1_1
+	if (pg_strcasecmp("TLSv1.1", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_1;
+#endif
+
+#ifdef SSL_LIBRARY_VERSION_TLS_1_2
+	if (pg_strcasecmp("TLSv1.2", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_2;
+#endif
+
+#ifdef SSL_LIBRARY_VERSION_TLS_1_3
+	if (pg_strcasecmp("TLSv1.3", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_3;
+#endif
+
+	return -1;
+}
+
+/*
+ * cert_database_has_CA
+ *		 Check for the presence of a CA certificate
+ *
+ * Returns true in case there is a CA certificate in the database connected
+ * to in the conn object, else false. This function only checks for the
+ * presence of a CA certificate, not it's validity and/or usefulness.
+ */
+static bool
+cert_database_has_CA(PGconn *conn)
+{
+	CERTCertList *certificates;
+	bool		hasCA;
+
+	/*
+	 * If the certificate database has a password we must provide it, since
+	 * this API doesn't invoke the standard password callback.
+	 */
+	if (conn->has_password)
+		certificates = PK11_ListCerts(PK11CertListCA, PQssl_passwd_cb(NULL, PR_FALSE, (void *) conn));
+	else
+		certificates = PK11_ListCerts(PK11CertListCA, NULL);
+	hasCA = !CERT_LIST_EMPTY(certificates);
+	CERT_DestroyCertList(certificates);
+
+	return hasCA;
+}
+
+PQsslKeyPassHook_nss_type
+PQgetSSLKeyPassHook_nss(void)
+{
+	return PQsslKeyPassHook;
+}
+
+void
+PQsetSSLKeyPassHook_nss(PQsslKeyPassHook_nss_type hook)
+{
+	PQsslKeyPassHook = hook;
+}
+
+/*
+ * PQssl_passwd_cb
+ *		 Supply a password to decrypt an object
+ *
+ * If an object in the NSS database is password protected, or if the entire
+ * NSS database is itself password protected, this callback will be invoked.
+ *
+ * This must match NSS type PK11PasswordFunc.
+ */
+static char *
+PQssl_passwd_cb(PK11SlotInfo *slot, PRBool retry, void *arg)
+{
+	PGconn	   *conn = (PGconn *) arg;
+
+	conn->has_password = true;
+
+	if (PQsslKeyPassHook)
+		return PQsslKeyPassHook(slot, (PRBool) retry, arg);
+	else
+		return PQdefaultSSLKeyPassHook_nss(slot, retry, arg);
+}
+
+/*
+ * PQdefaultSSLKeyPassHook_nss
+ * 		 Default password handler callback
+ *
+ * If no user defined password callback has been set up, the callback below
+ * will try the password set by the sslpassword parameter. Since we by legacy
+ * only have support for a single password, there is little reason to inspect
+ * the slot for the object in question. A TODO is to support different
+ * passwords for different objects, either via a DSL in sslpassword or with a
+ * new key/value style parameter. Users can supply their own password hook to
+ * do this of course, but it would be nice to support something in core too.
+ */
+char *
+PQdefaultSSLKeyPassHook_nss(PK11SlotInfo *slot, PRBool retry, void *arg)
+{
+	PGconn	   *conn = (PGconn *) arg;
+
+	/*
+	 * If the password didn't work the first time there is no point in
+	 * retrying as it hasn't changed.
+	 */
+	if (retry != PR_TRUE && conn->sslpassword && strlen(conn->sslpassword) > 0)
+		return PORT_Strdup(conn->sslpassword);
+
+	return NULL;
+}
diff --git a/src/interfaces/libpq/fe-secure.c b/src/interfaces/libpq/fe-secure.c
index c601071838..7f10da3010 100644
--- a/src/interfaces/libpq/fe-secure.c
+++ b/src/interfaces/libpq/fe-secure.c
@@ -448,6 +448,27 @@ PQdefaultSSLKeyPassHook_OpenSSL(char *buf, int size, PGconn *conn)
 }
 #endif							/* USE_OPENSSL */
 
+#ifndef USE_NSS
+
+PQsslKeyPassHook_nss_type
+PQgetSSLKeyPassHook_nss(void)
+{
+	return NULL;
+}
+
+void
+PQsetSSLKeyPassHook_nss(PQsslKeyPassHook_nss_type hook)
+{
+	return;
+}
+
+char *
+PQdefaultSSLKeyPassHook_nss(PK11SlotInfo * slot, PRBool retry, void *arg)
+{
+	return NULL;
+}
+#endif							/* USE_NSS */
+
 /* Dummy version of GSSAPI information functions, when built without GSS support */
 #ifndef ENABLE_GSS
 
diff --git a/src/interfaces/libpq/libpq-fe.h b/src/interfaces/libpq/libpq-fe.h
index effe0ccf85..aba32e6635 100644
--- a/src/interfaces/libpq/libpq-fe.h
+++ b/src/interfaces/libpq/libpq-fe.h
@@ -625,6 +625,17 @@ extern PQsslKeyPassHook_OpenSSL_type PQgetSSLKeyPassHook_OpenSSL(void);
 extern void PQsetSSLKeyPassHook_OpenSSL(PQsslKeyPassHook_OpenSSL_type hook);
 extern int	PQdefaultSSLKeyPassHook_OpenSSL(char *buf, int size, PGconn *conn);
 
+/* == in fe-secure-nss.c === */
+typedef struct PK11SlotInfoStr PK11SlotInfo;
+typedef int PRIntn;
+typedef PRIntn PRBool;
+
+/* Support for overriding sslpassword handling with a callback */
+typedef char *(*PQsslKeyPassHook_nss_type) (PK11SlotInfo *slot, PRBool retry, void *arg);
+extern PQsslKeyPassHook_nss_type PQgetSSLKeyPassHook_nss(void);
+extern void PQsetSSLKeyPassHook_nss(PQsslKeyPassHook_nss_type hook);
+extern char *PQdefaultSSLKeyPassHook_nss(PK11SlotInfo *slot, PRBool retry, void *arg);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/src/interfaces/libpq/libpq-int.h b/src/interfaces/libpq/libpq-int.h
index ce36aabd25..d7103f0bf2 100644
--- a/src/interfaces/libpq/libpq-int.h
+++ b/src/interfaces/libpq/libpq-int.h
@@ -363,6 +363,7 @@ struct pg_conn
 	char	   *sslrootcert;	/* root certificate filename */
 	char	   *sslcrl;			/* certificate revocation list filename */
 	char	   *sslcrldir;		/* certificate revocation list directory name */
+	char	   *cert_database;	/* NSS certificate/key database */
 	char	   *requirepeer;	/* required peer credentials for local sockets */
 	char	   *gssencmode;		/* GSS mode (require,prefer,disable) */
 	char	   *krbsrvname;		/* Kerberos service name */
@@ -486,6 +487,28 @@ struct pg_conn
 								 * OpenSSL version changes */
 #endif
 #endif							/* USE_OPENSSL */
+
+/*
+ * The NSS/NSPR specific types aren't used to avoid pulling in the required
+ * headers here, as they are causing conflicts with PG definitions.
+ */
+#ifdef USE_NSS
+	void	   *nss_context;	/* NSS connection specific context */
+	void	   *pr_fd;			/* NSPR file descriptor for the connection */
+
+	/*
+	 * Track whether the NSS database has a password set or not. There is no
+	 * API function for retrieving password status of a database, but we need
+	 * to know since some NSS API calls require the password passed in (they
+	 * don't call the callback themselves). To track, we simply flip this to
+	 * true in case NSS invoked the password callback - as that will only
+	 * happen in case there is a password. The reason for tracking this is
+	 * that there are calls which require a password parameter, but doesn't
+	 * use the callbacks provided, so we must call the callback on behalf of
+	 * these.
+	 */
+	bool		has_password;
+#endif							/* USE_NSS */
 #endif							/* USE_SSL */
 
 #ifdef ENABLE_GSS
@@ -760,7 +783,7 @@ extern ssize_t pgtls_write(PGconn *conn, const void *ptr, size_t len);
  * This is not supported with old versions of OpenSSL that don't have
  * the X509_get_signature_nid() function.
  */
-#if defined(USE_OPENSSL) && defined(HAVE_X509_GET_SIGNATURE_NID)
+#if defined(USE_NSS) || (defined(USE_OPENSSL) && defined(HAVE_X509_GET_SIGNATURE_NID))
 #define HAVE_PGTLS_GET_PEER_CERTIFICATE_HASH
 extern char *pgtls_get_peer_certificate_hash(PGconn *conn, size_t *len);
 #endif
-- 
2.21.1 (Apple Git-122.3)

From dddbaa5e7414cf05e7c5e7c26810d28f286e3285 Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Mon, 8 Feb 2021 23:52:22 +0100
Subject: [PATCH v30 1/9] nss: Support libnss as TLS library in libpq

This commit contains the frontend and backend portion of TLS support
in libpq to allow encrypted connections. The implementation is done
as a drop-in replacement for the OpenSSL support and leverages the
same internal API for abstracting library specific details.

A new GUC, ssl_database, is used to identify the NSS database used for
the serverside certificates and keys. The existing certificate and key
GUCs are used for providing certificate and key nicknames.

Client side there is a new connection parameter, cert_database, to
identify the client cert and key. All existing sslmodes are supported
in the same way as with OpenSSL.

Authors: Daniel Gustafsson, Andrew Dunstan, Jacob Champion
Reviewed-by: Michael Paquier
---
 .../postgres_fdw/expected/postgres_fdw.out    |    2 +-
 src/backend/libpq/auth.c                      |    7 +
 src/backend/libpq/be-secure-nss.c             | 1388 +++++++++++++++++
 src/backend/libpq/be-secure.c                 |    3 +
 src/backend/utils/misc/guc.c                  |   20 +-
 src/common/cipher_nss.c                       |  192 +++
 src/include/common/nss.h                      |   49 +
 src/include/libpq/libpq-be.h                  |   10 +-
 src/include/libpq/libpq.h                     |    3 +
 src/include/pg_config_manual.h                |    2 +-
 src/interfaces/libpq/fe-connect.c             |    4 +
 src/interfaces/libpq/fe-secure-nss.c          | 1088 +++++++++++++
 src/interfaces/libpq/fe-secure.c              |   21 +
 src/interfaces/libpq/libpq-fe.h               |   11 +
 src/interfaces/libpq/libpq-int.h              |   25 +-
 15 files changed, 2820 insertions(+), 5 deletions(-)
 create mode 100644 src/backend/libpq/be-secure-nss.c
 create mode 100644 src/common/cipher_nss.c
 create mode 100644 src/include/common/nss.h
 create mode 100644 src/interfaces/libpq/fe-secure-nss.c

diff --git a/contrib/postgres_fdw/expected/postgres_fdw.out b/contrib/postgres_fdw/expected/postgres_fdw.out
index 0649b6b81c..3d51a7c9b8 100644
--- a/contrib/postgres_fdw/expected/postgres_fdw.out
+++ b/contrib/postgres_fdw/expected/postgres_fdw.out
@@ -8946,7 +8946,7 @@ DO $d$
     END;
 $d$;
 ERROR:  invalid option "password"
-HINT:  Valid options in this context are: service, passfile, channel_binding, connect_timeout, dbname, host, hostaddr, port, options, application_name, keepalives, keepalives_idle, keepalives_interval, keepalives_count, tcp_user_timeout, sslmode, sslcompression, sslcert, sslkey, sslrootcert, sslcrl, sslcrldir, requirepeer, ssl_min_protocol_version, ssl_max_protocol_version, gssencmode, krbsrvname, gsslib, target_session_attrs, use_remote_estimate, fdw_startup_cost, fdw_tuple_cost, extensions, updatable, fetch_size, batch_size
+HINT:  Valid options in this context are: service, passfile, channel_binding, connect_timeout, dbname, host, hostaddr, port, options, application_name, keepalives, keepalives_idle, keepalives_interval, keepalives_count, tcp_user_timeout, sslmode, sslcompression, sslcert, sslkey, sslrootcert, sslcrl, sslcrldir, requirepeer, ssl_min_protocol_version, ssl_max_protocol_version, gssencmode, krbsrvname, gsslib, target_session_attrs, cert_database, use_remote_estimate, fdw_startup_cost, fdw_tuple_cost, extensions, updatable, fetch_size, batch_size
 CONTEXT:  SQL statement "ALTER SERVER loopback_nopw OPTIONS (ADD password 'dummypw')"
 PL/pgSQL function inline_code_block line 3 at EXECUTE
 -- If we add a password for our user mapping instead, we should get a different
diff --git a/src/backend/libpq/auth.c b/src/backend/libpq/auth.c
index baa0712c0f..db08a75326 100644
--- a/src/backend/libpq/auth.c
+++ b/src/backend/libpq/auth.c
@@ -2849,7 +2849,14 @@ CheckCertAuth(Port *port)
 {
 	int			status_check_usermap = STATUS_ERROR;
 
+#if defined(USE_OPENSSL)
 	Assert(port->ssl);
+#elif defined(USE_NSS)
+	/* TODO: should we rename pr_fd to ssl, to keep consistency? */
+	Assert(port->pr_fd);
+#else
+	Assert(false);
+#endif
 
 	/* Make sure we have received a username in the certificate */
 	if (port->peer_cn == NULL ||
diff --git a/src/backend/libpq/be-secure-nss.c b/src/backend/libpq/be-secure-nss.c
new file mode 100644
index 0000000000..a17e6c7e5d
--- /dev/null
+++ b/src/backend/libpq/be-secure-nss.c
@@ -0,0 +1,1388 @@
+/*-------------------------------------------------------------------------
+ *
+ * be-secure-nss.c
+ *	  functions for supporting NSS as a TLS backend
+ *
+ *
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ *	  src/backend/libpq/be-secure-nss.c
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#include "postgres.h"
+
+#include <sys/stat.h>
+
+#include "common/nss.h"
+
+/*
+ * The nspr/obsolete/protypes.h NSPR header typedefs uint64 and int64 with
+ * colliding definitions from ours, causing a much expected compiler error.
+ * Remove backwards compatibility with ancient NSPR versions to avoid this.
+ */
+#define NO_NSPR_10_SUPPORT
+#include <nspr/nspr.h>
+#include <nspr/prerror.h>
+#include <nspr/prio.h>
+#include <nspr/prmem.h>
+#include <nspr/prtypes.h>
+
+#include <nss/nss.h>
+#include <nss/base64.h>
+#include <nss/cert.h>
+#include <nss/certdb.h>
+#include <nss/hasht.h>
+#include <nss/keyhi.h>
+#include <nss/pk11pub.h>
+#include <nss/secder.h>
+#include <nss/secerr.h>
+#include <nss/secitem.h>
+#include <nss/secoidt.h>
+#include <nss/secport.h>
+#include <nss/ssl.h>
+#include <nss/sslerr.h>
+#include <nss/sslproto.h>
+
+#include "lib/stringinfo.h"
+#include "libpq/libpq.h"
+#include "nodes/pg_list.h"
+#include "miscadmin.h"
+#include "storage/fd.h"
+#include "utils/guc.h"
+#include "utils/memutils.h"
+
+
+/* default init hook can be overridden by a shared library */
+static void default_nss_tls_init(bool isServerStart);
+nss_tls_init_hook_type nss_tls_init_hook = default_nss_tls_init;
+
+static PRDescIdentity pr_id;
+
+static PRIOMethods pr_iomethods;
+static NSSInitContext *nss_context = NULL;
+static SSLVersionRange desired_sslver;
+
+static char *external_ssl_passphrase_cb(PK11SlotInfo *slot, PRBool retry, void *arg);
+static SECStatus pg_SSLShutdownFunc(void *private_data, void *nss_data);
+static bool dummy_ssl_passwd_cb_called = false;
+static bool ssl_is_server_start;
+
+/*
+ * PR_ImportTCPSocket() is a private API, but very widely used, as it's the
+ * only way to make NSS use an already set up POSIX file descriptor rather
+ * than opening one itself. To quote the NSS documentation:
+ *
+ *		"In theory, code that uses PR_ImportTCPSocket may break when NSPR's
+ *		implementation changes. In practice, this is unlikely to happen because
+ *		NSPR's implementation has been stable for years and because of NSPR's
+ *		strong commitment to backward compatibility."
+ *
+ * https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSPR/Reference/PR_ImportTCPSocket
+ *
+ * The function is declared in <private/pprio.h>, but as it is a header marked
+ * private we declare it here rather than including it.
+ */
+NSPR_API(PRFileDesc *) PR_ImportTCPSocket(int);
+
+/* NSS IO layer callback overrides */
+static PRInt32 pg_ssl_read(PRFileDesc *fd, void *buf, PRInt32 amount,
+						   PRIntn flags, PRIntervalTime timeout);
+static PRInt32 pg_ssl_write(PRFileDesc *fd, const void *buf, PRInt32 amount,
+							PRIntn flags, PRIntervalTime timeout);
+static PRStatus pg_ssl_close(PRFileDesc *fd);
+/* Utility functions */
+static PRFileDesc *init_iolayer(Port *port);
+static uint16 ssl_protocol_version_to_nss(int v, const char *guc_name);
+
+static char *pg_SSLerrmessage(PRErrorCode errcode);
+static char *ssl_protocol_version_to_string(int v);
+static SECStatus pg_cert_auth_handler(void *arg, PRFileDesc *fd,
+									  PRBool checksig, PRBool isServer);
+static SECStatus pg_bad_cert_handler(void *arg, PRFileDesc *fd);
+static char *dummy_ssl_passphrase_cb(PK11SlotInfo *slot, PRBool retry, void *arg);
+
+/* ------------------------------------------------------------ */
+/*						 Public interface						*/
+/* ------------------------------------------------------------ */
+
+/*
+ * be_tls_init
+ *			Initialize the nss TLS library in the postmaster
+ *
+ * The majority of the setup needs to happen in be_tls_open_server since the
+ * NSPR initialization must happen after the forking of the backend. We could
+ * potentially move some parts in under !isServerStart, but so far this is the
+ * separation chosen.
+ */
+int
+be_tls_init(bool isServerStart)
+{
+	SECStatus	status;
+	SSLVersionRange supported_sslver;
+
+	status = SSL_ConfigServerSessionIDCacheWithOpt(0, 0, NULL, 1, 0, 0, PR_FALSE);
+	if (status != SECSuccess)
+	{
+		ereport(isServerStart ? FATAL : LOG,
+				(errmsg("unable to connect to TLS connection cache: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+		return -1;
+	}
+
+	if (!ssl_database || strlen(ssl_database) == 0)
+	{
+		ereport(isServerStart ? FATAL : LOG,
+				(errmsg("no certificate database specified")));
+		return -1;
+	}
+
+	/*
+	 * We check for the desired TLS version range here, even though we cannot
+	 * set it until be_open_server such that we can be compatible with how the
+	 * OpenSSL backend reports errors for incompatible range configurations.
+	 * Set either the default supported TLS version range, or the configured
+	 * range from ssl_min_protocol_version and ssl_max_protocol version. In
+	 * case the user hasn't defined the maximum allowed version we fall back
+	 * to the highest version TLS that the library supports.
+	 */
+	if (SSL_VersionRangeGetSupported(ssl_variant_stream, &supported_sslver) != SECSuccess)
+	{
+		ereport(isServerStart ? FATAL : LOG,
+				(errmsg("unable to get default protocol support from NSS")));
+		return -1;
+	}
+
+	/*
+	 * Set the fallback versions for the TLS protocol version range to a
+	 * combination of our minimal requirement and the library maximum. Error
+	 * messages should be kept identical to those in be-secure-openssl.c to
+	 * make translations easier.
+	 */
+	desired_sslver.min = SSL_LIBRARY_VERSION_TLS_1_0;
+	desired_sslver.max = supported_sslver.max;
+
+	if (ssl_min_protocol_version)
+	{
+		int			ver = ssl_protocol_version_to_nss(ssl_min_protocol_version,
+													  "ssl_min_protocol_version");
+
+		if (ver == -1)
+		{
+			ereport(isServerStart ? FATAL : LOG,
+					(errmsg("\"%s\" setting \"%s\" not supported by this build",
+							"ssl_min_protocol_version",
+							GetConfigOption("ssl_min_protocol_version",
+											false, false))));
+			return -1;
+		}
+
+		if (ver > 0)
+			desired_sslver.min = ver;
+	}
+
+	if (ssl_max_protocol_version)
+	{
+		int			ver = ssl_protocol_version_to_nss(ssl_max_protocol_version,
+													  "ssl_max_protocol_version");
+
+		if (ver == -1)
+		{
+			ereport(isServerStart ? FATAL : LOG,
+					(errmsg("\"%s\" setting \"%s\" not supported by this build",
+							"ssl_max_protocol_version",
+							GetConfigOption("ssl_max_protocol_version",
+											false, false))));
+			return -1;
+		}
+		if (ver > 0)
+			desired_sslver.max = ver;
+
+		if (ver < desired_sslver.min)
+		{
+			ereport(isServerStart ? FATAL : LOG,
+					(errmsg("could not set SSL protocol version range"),
+					 errdetail("\"%s\" cannot be higher than \"%s\"",
+							   "ssl_min_protocol_version",
+							   "ssl_max_protocol_version")));
+			return -1;
+		}
+	}
+
+	/*
+	 * Set the passphrase callback which will be used both to obtain the
+	 * passphrase from the user, as well as by NSS to obtain the phrase
+	 * repeatedly.
+	 */
+	ssl_is_server_start = isServerStart;
+	(*nss_tls_init_hook) (isServerStart);
+
+	return 0;
+}
+
+int
+be_tls_open_server(Port *port)
+{
+	SECStatus	status;
+	PRFileDesc *model;
+	PRFileDesc *pr_fd;
+	PRFileDesc *layer;
+	CERTCertificate *server_cert;
+	SECKEYPrivateKey *private_key;
+	CERTSignedCrl *crl;
+	SECItem		crlname;
+	char	   *cert_database;
+	NSSInitParameters params;
+
+	/*
+	 * The NSPR documentation states that runtime initialization via PR_Init
+	 * is no longer required, as the first caller into NSPR will perform the
+	 * initialization implicitly. The documentation doesn't however clarify
+	 * from which version this is holds true, so let's perform the potentially
+	 * superfluous initialization anyways to avoid crashing on older versions
+	 * of NSPR, as there is no difference in overhead.  The NSS documentation
+	 * still states that PR_Init must be called in some way (implicitly or
+	 * explicitly).
+	 *
+	 * The below parameters are what the implicit initialization would've done
+	 * for us, and should work even for older versions where it might not be
+	 * done automatically. The last parameter, maxPTDs, is set to various
+	 * values in other codebases, but has been unused since NSPR 2.1 which was
+	 * released sometime in 1998. In current versions of NSPR all parameters
+	 * are ignored.
+	 */
+	PR_Init(PR_USER_THREAD, PR_PRIORITY_NORMAL, 0 /* maxPTDs */ );
+
+	/*
+	 * The certificate path (configdir) must contain a valid NSS database. If
+	 * the certificate path isn't a valid directory, NSS will fall back on the
+	 * system certificate database. If the certificate path is a directory but
+	 * is empty then the initialization will fail. On the client side this can
+	 * be allowed for any sslmode but the verify-xxx ones.
+	 * https://bugzilla.redhat.com/show_bug.cgi?id=728562 For the server side
+	 * we won't allow this to fail however, as we require the certificate and
+	 * key to exist.
+	 *
+	 * The original design of NSS was for a single application to use a single
+	 * copy of it, initialized with NSS_Initialize() which isn't returning any
+	 * handle with which to refer to NSS. NSS initialization and shutdown are
+	 * global for the application, so a shutdown in another NSS enabled
+	 * library would cause NSS to be stopped for libpq as well.  The fix has
+	 * been to introduce NSS_InitContext which returns a context handle to
+	 * pass to NSS_ShutdownContext.  NSS_InitContext was introduced in NSS
+	 * 3.12, but the use of it is not very well documented.
+	 * https://bugzilla.redhat.com/show_bug.cgi?id=738456
+	 *
+	 * The InitParameters struct passed can be used to override internal
+	 * values in NSS, but the usage is not documented at all. When using
+	 * NSS_Init initializations, the values are instead set via PK11_Configure
+	 * calls so the PK11_Configure documentation can be used to glean some
+	 * details on these.
+	 *
+	 * https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS/PKCS11/Module_Specs
+	 */
+	memset(&params, '\0', sizeof(params));
+	params.length = sizeof(params);
+
+	if (!ssl_database || strlen(ssl_database) == 0)
+		ereport(FATAL,
+				(errmsg("no certificate database specified")));
+
+	cert_database = psprintf("sql:%s", ssl_database);
+	nss_context = NSS_InitContext(cert_database, "", "", "",
+								  &params,
+								  NSS_INIT_READONLY | NSS_INIT_PK11RELOAD);
+	pfree(cert_database);
+
+	if (!nss_context)
+		ereport(FATAL,
+				(errmsg("unable to read certificate database \"%s\": %s",
+						ssl_database, pg_SSLerrmessage(PR_GetError()))));
+
+	/*
+	 * Import the already opened socket as we don't want to use NSPR functions
+	 * for opening the network socket due to how the PostgreSQL protocol works
+	 * with TLS connections. This function is not part of the NSPR public API,
+	 * see the comment at the top of the file for the rationale of still using
+	 * it.
+	 */
+	pr_fd = PR_ImportTCPSocket(port->sock);
+	if (!pr_fd)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to connect to socket")));
+		return -1;
+	}
+
+	/*
+	 * Most of the documentation available, and implementations of, NSS/NSPR
+	 * use the PR_NewTCPSocket() function here, which has the drawback that it
+	 * can only create IPv4 sockets. Instead use PR_OpenTCPSocket() which
+	 * copes with IPv6 as well.
+	 *
+	 * We use a model filedescriptor here which is a construct in NSPR/NSS in
+	 * order to create a configuration template for sockets which can then be
+	 * applied to new sockets created. This makes more sense in a server which
+	 * accepts multiple connections and want to perform the boilerplate just
+	 * once, but it does provide a nice abstraction here as well in that we
+	 * can error out early without having performed any operation on the real
+	 * socket.
+	 */
+	model = PR_OpenTCPSocket(port->laddr.addr.ss_family);
+	if (!model)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to open socket")));
+		return -1;
+	}
+
+	/*
+	 * Convert the NSPR socket to an SSL socket. Ensuring the success of this
+	 * operation is critical as NSS SSL_* functions may return SECSuccess on
+	 * the socket even though SSL hasn't been enabled, which introduce a risk
+	 * of silent downgrades.
+	 */
+	model = SSL_ImportFD(NULL, model);
+	if (!model)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to enable TLS on socket")));
+		return -1;
+	}
+
+	/*
+	 * Configure basic settings for the connection over the SSL socket in
+	 * order to set it up as a server.
+	 */
+	if (SSL_OptionSet(model, SSL_SECURITY, PR_TRUE) != SECSuccess)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to configure TLS connection")));
+		return -1;
+	}
+
+	if (SSL_OptionSet(model, SSL_HANDSHAKE_AS_SERVER, PR_TRUE) != SECSuccess ||
+		SSL_OptionSet(model, SSL_HANDSHAKE_AS_CLIENT, PR_FALSE) != SECSuccess)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to configure TLS connection as server")));
+		return -1;
+	}
+
+	/*
+	 * SSLv2 is disabled by default, and SSLv3 will be excluded from the range
+	 * of allowed protocols further down. Since we really don't want these to
+	 * ever be enabled, let's use belts and suspenders and explicitly turn
+	 * them off as well.
+	 */
+	SSL_OptionSet(model, SSL_ENABLE_SSL2, PR_FALSE);
+	SSL_OptionSet(model, SSL_ENABLE_SSL3, PR_FALSE);
+
+#ifdef SSL_CBC_RANDOM_IV
+
+	/*
+	 * Enable protection against the BEAST attack in case the NSS server has
+	 * support for that. While SSLv3 is disabled, we may still allow TLSv1
+	 * which is affected. The option isn't documented as an SSL option, but as
+	 * an NSS environment variable.
+	 */
+	SSL_OptionSet(model, SSL_CBC_RANDOM_IV, PR_TRUE);
+#endif
+
+	/*
+	 * Configure the allowed ciphers. If there are no user preferred suites,
+	 * set the domestic policy.
+	 *
+	 * Historically there were different cipher policies based on export (and
+	 * import) restrictions: Domestic, Export and France. These are since long
+	 * removed with all ciphers being enabled by default. Due to backwards
+	 * compatibility, the old API is still used even though all three policies
+	 * now do the same thing.
+	 *
+	 * If SSLCipherSuites define a policy of the user, we set that rather than
+	 * enabling all ciphers via NSS_SetDomesticPolicy.
+	 *
+	 * TODO: while this code works, the set of ciphers which can be set and
+	 * still end up with a working socket is woefully underdocumented for
+	 * anything more recent than SSLv3 (the code for TLS actually calls ssl3
+	 * functions under the hood for SSL_CipherPrefSet), so it's unclear if
+	 * this is helpful or not. Using the policies works, but may be too
+	 * coarsely grained.
+	 *
+	 * Another TODO: The SSL_ImplementedCiphers table returned with calling
+	 * SSL_GetImplementedCiphers is sorted in server preference order. Sorting
+	 * SSLCipherSuites according to the order of the ciphers therein could be
+	 * a way to implement ssl_prefer_server_ciphers - if we at all want to use
+	 * cipher selection for NSS like how we do it for OpenSSL that is.
+	 */
+
+	/*
+	 * If no ciphers are specified, enable them all.
+	 */
+	if (!SSLCipherSuites || strlen(SSLCipherSuites) == 0)
+	{
+		status = NSS_SetDomesticPolicy();
+		if (status != SECSuccess)
+		{
+			ereport(COMMERROR,
+					(errmsg("unable to set cipher policy: %s",
+							pg_SSLerrmessage(PR_GetError()))));
+			return -1;
+		}
+	}
+	else
+	{
+		char	   *ciphers,
+				   *c;
+
+		char	   *sep = ":;, ";
+		PRUint16	ciphercode;
+		const		PRUint16 *nss_ciphers;
+
+		/*
+		 * If the user has specified a set of preferred cipher suites we start
+		 * by turning off all the existing suites to avoid the risk of down-
+		 * grades to a weaker cipher than expected.
+		 */
+		nss_ciphers = SSL_GetImplementedCiphers();
+		for (int i = 0; i < SSL_GetNumImplementedCiphers(); i++)
+			SSL_CipherPrefSet(model, nss_ciphers[i], PR_FALSE);
+
+		ciphers = pstrdup(SSLCipherSuites);
+
+		for (c = strtok(ciphers, sep); c; c = strtok(NULL, sep))
+		{
+			if (!pg_find_cipher(c, &ciphercode))
+			{
+				status = SSL_CipherPrefSet(model, ciphercode, PR_TRUE);
+				if (status != SECSuccess)
+				{
+					ereport(COMMERROR,
+							(errmsg("invalid cipher-suite specified: %s", c)));
+					return -1;
+				}
+			}
+		}
+
+		pfree(ciphers);
+	}
+
+	if (SSL_VersionRangeSet(model, &desired_sslver) != SECSuccess)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to set requested SSL protocol version range")));
+		return -1;
+	}
+
+	/*
+	 * Set up the custom IO layer.
+	 */
+	layer = init_iolayer(port);
+	if (!layer)
+		return -1;
+
+	if (PR_PushIOLayer(pr_fd, PR_TOP_IO_LAYER, layer) != PR_SUCCESS)
+	{
+		PR_Close(layer);
+		ereport(COMMERROR,
+				(errmsg("unable to push IO layer")));
+		return -1;
+	}
+
+	server_cert = PK11_FindCertFromNickname(ssl_cert_file, (void *) port);
+	if (!server_cert)
+	{
+		if (dummy_ssl_passwd_cb_called)
+		{
+			ereport(COMMERROR,
+					(errmsg("unable to load certificate for \"%s\": %s",
+							ssl_cert_file, pg_SSLerrmessage(PR_GetError())),
+					 errhint("The certificate requires a password.")));
+			return -1;
+		}
+		else
+		{
+			ereport(COMMERROR,
+					(errmsg("unable to find certificate for \"%s\": %s",
+							ssl_cert_file, pg_SSLerrmessage(PR_GetError()))));
+			return -1;
+		}
+	}
+
+	private_key = PK11_FindKeyByAnyCert(server_cert, (void *) port);
+	if (!private_key)
+	{
+		if (dummy_ssl_passwd_cb_called)
+		{
+			ereport(COMMERROR,
+					(errmsg("unable to load private key for \"%s\": %s",
+							ssl_cert_file, pg_SSLerrmessage(PR_GetError())),
+					 errhint("The private key requires a password.")));
+			return -1;
+		}
+		else
+		{
+			ereport(COMMERROR,
+					(errmsg("unable to find private key for \"%s\": %s",
+							ssl_cert_file, pg_SSLerrmessage(PR_GetError()))));
+			return -1;
+		}
+	}
+
+	/*
+	 * NSS doesn't use CRL files on disk, so we use the ssl_crl_file guc to
+	 * contain the CRL nickname for the current server certificate in the NSS
+	 * certificate database. The main difference from the OpenSSL backend is
+	 * that NSS will use the CRL regardless, but being able to make sure the
+	 * CRL is loaded seems like a good feature.
+	 */
+	if (ssl_crl_file[0])
+	{
+		SECITEM_CopyItem(NULL, &crlname, &server_cert->derSubject);
+		crl = SEC_FindCrlByName(CERT_GetDefaultCertDB(), &crlname, SEC_CRL_TYPE);
+		if (!crl)
+		{
+			ereport(COMMERROR,
+					(errmsg("specified CRL not found in database")));
+			return -1;
+		}
+		SEC_DestroyCrl(crl);
+	}
+
+	/*
+	 * Finally we must configure the socket for being a server by setting the
+	 * certificate and key. The NULL parameter is an SSLExtraServerCertData
+	 * pointer with the final parameter being the size of the extra server
+	 * cert data structure pointed to. This is typically only used for
+	 * credential delegation.
+	 */
+	status = SSL_ConfigServerCert(model, server_cert, private_key, NULL, 0);
+	if (status != SECSuccess)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to configure server for TLS server connections: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+		return -1;
+	}
+
+	ssl_loaded_verify_locations = true;
+
+	/*
+	 * At this point, we no longer have use for the certificate and private
+	 * key as they have been copied into the context by NSS. Destroy our
+	 * copies explicitly to clean out the memory as best we can.
+	 */
+	CERT_DestroyCertificate(server_cert);
+	SECKEY_DestroyPrivateKey(private_key);
+
+	/* Set up certificate authentication callback */
+	status = SSL_AuthCertificateHook(model, pg_cert_auth_handler, (void *) port);
+	if (status != SECSuccess)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to install authcert hook: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+		return -1;
+	}
+	SSL_BadCertHook(model, pg_bad_cert_handler, (void *) port);
+	SSL_OptionSet(model, SSL_REQUEST_CERTIFICATE, PR_TRUE);
+	SSL_OptionSet(model, SSL_REQUIRE_CERTIFICATE, PR_FALSE);
+
+	port->pr_fd = SSL_ImportFD(model, pr_fd);
+	if (!port->pr_fd)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to initialize")));
+		return -1;
+	}
+
+	PR_Close(model);
+
+	/*
+	 * Force a handshake on the next I/O request, the second parameter means
+	 * that we are a server, PR_FALSE would indicate being a client. NSPR
+	 * requires us to call SSL_ResetHandshake since we imported an already
+	 * established socket.
+	 */
+	status = SSL_ResetHandshake(port->pr_fd, PR_TRUE);
+	if (status != SECSuccess)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to initiate handshake: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+		return -1;
+	}
+	status = SSL_ForceHandshake(port->pr_fd);
+	if (status != SECSuccess)
+	{
+		ereport(COMMERROR,
+				(errmsg("unable to handshake: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+		return -1;
+	}
+
+	port->ssl_in_use = true;
+
+	/* Register out shutdown callback */
+	NSS_RegisterShutdown(pg_SSLShutdownFunc, port);
+
+	return 0;
+}
+
+ssize_t
+be_tls_read(Port *port, void *ptr, size_t len, int *waitfor)
+{
+	ssize_t		n_read;
+	PRErrorCode err;
+
+	n_read = PR_Read(port->pr_fd, ptr, len);
+
+	if (n_read < 0)
+	{
+		err = PR_GetError();
+
+		if (err == PR_WOULD_BLOCK_ERROR)
+		{
+			*waitfor = WL_SOCKET_READABLE;
+			errno = EWOULDBLOCK;
+		}
+		else
+			errno = ECONNRESET;
+	}
+
+	return n_read;
+}
+
+ssize_t
+be_tls_write(Port *port, void *ptr, size_t len, int *waitfor)
+{
+	ssize_t		n_write;
+	PRErrorCode err;
+	PRIntn		flags = 0;
+
+	/*
+	 * The flags parameter to PR_Send is no longer used and is, according to
+	 * the documentation, required to be zero.
+	 */
+	n_write = PR_Send(port->pr_fd, ptr, len, flags, PR_INTERVAL_NO_WAIT);
+
+	if (n_write < 0)
+	{
+		err = PR_GetError();
+
+		if (err == PR_WOULD_BLOCK_ERROR)
+		{
+			*waitfor = WL_SOCKET_WRITEABLE;
+			errno = EWOULDBLOCK;
+		}
+		else
+			errno = ECONNRESET;
+	}
+
+	return n_write;
+}
+
+void
+be_tls_close(Port *port)
+{
+	if (!port)
+		return;
+
+	if (port->peer_cn)
+	{
+		SSL_InvalidateSession(port->pr_fd);
+		pfree(port->peer_cn);
+		port->peer_cn = NULL;
+	}
+
+	PR_Close(port->pr_fd);
+	port->pr_fd = NULL;
+	port->ssl_in_use = false;
+
+	if (nss_context)
+	{
+		NSS_ShutdownContext(nss_context);
+		nss_context = NULL;
+	}
+}
+
+void
+be_tls_destroy(void)
+{
+	/*
+	 * It reads a bit odd to clear a session cache when we are destroying the
+	 * context altogether, but if the session cache isn't cleared before
+	 * shutting down the context it will fail with SEC_ERROR_BUSY.
+	 */
+	SSL_ClearSessionCache();
+}
+
+int
+be_tls_get_cipher_bits(Port *port)
+{
+	SECStatus	status;
+	SSLChannelInfo channel;
+	SSLCipherSuiteInfo suite;
+
+	status = SSL_GetChannelInfo(port->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+		goto error;
+
+	status = SSL_GetCipherSuiteInfo(channel.cipherSuite, &suite, sizeof(suite));
+	if (status != SECSuccess)
+		goto error;
+
+	return suite.effectiveKeyBits;
+
+error:
+	ereport(WARNING,
+			(errmsg("unable to extract TLS session information: %s",
+					pg_SSLerrmessage(PR_GetError()))));
+	return 0;
+}
+
+/*
+ * be_tls_get_compression
+ *
+ * NSS disabled support for TLS compression in version 3.33 and removed the
+ * code in a subsequent release. The API for retrieving information about
+ * compression as well as enabling it is kept for backwards compatibility, but
+ * we don't need to consult it since it was only available for SSLv3 which we
+ * don't support.
+ *
+ * https://bugzilla.mozilla.org/show_bug.cgi?id=1409587
+ */
+bool
+be_tls_get_compression(Port *port)
+{
+	return false;
+}
+
+/*
+ * be_tls_get_version
+ *
+ * Returns the protocol version used for the current connection, or NULL in
+ * case of errors.
+ */
+const char *
+be_tls_get_version(Port *port)
+{
+	SECStatus	status;
+	SSLChannelInfo channel;
+
+	status = SSL_GetChannelInfo(port->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+	{
+		ereport(WARNING,
+				(errmsg("unable to extract TLS session information: %s",
+						pg_SSLerrmessage(PR_GetError()))));
+		return NULL;
+	}
+
+	return ssl_protocol_version_to_string(channel.protocolVersion);
+}
+
+const char *
+be_tls_get_cipher(Port *port)
+{
+	SECStatus	status;
+	SSLChannelInfo channel;
+	SSLCipherSuiteInfo suite;
+
+	status = SSL_GetChannelInfo(port->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+		goto error;
+
+	status = SSL_GetCipherSuiteInfo(channel.cipherSuite, &suite, sizeof(suite));
+	if (status != SECSuccess)
+		goto error;
+
+	return suite.cipherSuiteName;
+
+error:
+	ereport(WARNING,
+			(errmsg("unable to extract TLS session information: %s",
+					pg_SSLerrmessage(PR_GetError()))));
+	return NULL;
+}
+
+void
+be_tls_get_peer_subject_name(Port *port, char *ptr, size_t len)
+{
+	CERTCertificate *certificate;
+
+	certificate = SSL_PeerCertificate(port->pr_fd);
+	if (certificate)
+		strlcpy(ptr, CERT_NameToAscii(&certificate->subject), len);
+	else
+		ptr[0] = '\0';
+}
+
+void
+be_tls_get_peer_issuer_name(Port *port, char *ptr, size_t len)
+{
+	CERTCertificate *certificate;
+
+	certificate = SSL_PeerCertificate(port->pr_fd);
+	if (certificate)
+		strlcpy(ptr, CERT_NameToAscii(&certificate->issuer), len);
+	else
+		ptr[0] = '\0';
+}
+
+void
+be_tls_get_peer_serial(Port *port, char *ptr, size_t len)
+{
+	CERTCertificate *certificate;
+
+	certificate = SSL_PeerCertificate(port->pr_fd);
+	if (certificate)
+		snprintf(ptr, len, "%li", DER_GetInteger(&(certificate->serialNumber)));
+	else
+		ptr[0] = '\0';
+}
+
+char *
+be_tls_get_certificate_hash(Port *port, size_t *len)
+{
+	CERTCertificate *certificate;
+	SECOidTag	signature_tag;
+	SECOidTag	digest_alg;
+	int			digest_len;
+	SECStatus	status;
+	PLArenaPool *arena = NULL;
+	SECItem		digest;
+	char	   *ret;
+	PK11Context *ctx = NULL;
+	unsigned int outlen;
+
+	*len = 0;
+	certificate = SSL_LocalCertificate(port->pr_fd);
+	if (!certificate)
+		return NULL;
+
+	signature_tag = SECOID_GetAlgorithmTag(&certificate->signature);
+	if (!pg_find_signature_algorithm(signature_tag, &digest_alg, &digest_len))
+		elog(ERROR, "could not find digest for OID '%s'",
+			 SECOID_FindOIDTagDescription(signature_tag));
+
+	/*
+	 * The TLS server's certificate bytes need to be hashed with SHA-256 if
+	 * its signature algorithm is MD5 or SHA-1 as per RFC 5929
+	 * (https://tools.ietf.org/html/rfc5929#section-4.1).  If something else
+	 * is used, the same hash as the signature algorithm is used.
+	 */
+	if (digest_alg == SEC_OID_SHA1 || digest_alg == SEC_OID_MD5)
+	{
+		digest_alg = SEC_OID_SHA256;
+		digest_len = SHA256_LENGTH;
+	}
+
+	ctx = PK11_CreateDigestContext(digest_alg);
+	if (!ctx)
+		elog(ERROR, "out of memory");
+
+	arena = PORT_NewArena(SEC_ASN1_DEFAULT_ARENA_SIZE);
+	digest.data = PORT_ArenaZAlloc(arena, sizeof(unsigned char) * digest_len);
+	digest.len = digest_len;
+
+	status = SECSuccess;
+	status |= PK11_DigestBegin(ctx);
+	status |= PK11_DigestOp(ctx, certificate->derCert.data, certificate->derCert.len);
+	status |= PK11_DigestFinal(ctx, digest.data, &outlen, digest_len);
+
+	if (status != SECSuccess)
+	{
+		PORT_FreeArena(arena, PR_TRUE);
+		PK11_DestroyContext(ctx, PR_TRUE);
+		elog(ERROR, "could not generate server certificate hash");
+	}
+
+	ret = palloc(digest.len);
+	memcpy(ret, digest.data, digest.len);
+	*len = digest_len;
+
+	PORT_FreeArena(arena, PR_TRUE);
+	PK11_DestroyContext(ctx, PR_TRUE);
+
+	return ret;
+}
+
+/* ------------------------------------------------------------ */
+/*						Internal functions						*/
+/* ------------------------------------------------------------ */
+
+/*
+ * default_nss_tls_init
+ *
+ * The default TLS init hook function which users can override for installing
+ * their own passphrase callbacks and similar actions. In case no callback has
+ * been configured, or the callback isn't reload capable during a server
+ * reload, the dummy callback will be installed.
+ *
+ * The private data for the callback is set differently depending on how it's
+ * invoked. For calls which may invoke the callback deeper in the callstack
+ * the private data is set with SSL_SetPKCS11PinArg. When the call is directly
+ * invoking the callback, like PK11_FindCertFromNickname, then the private
+ * data is passed as a parameter. Setting the data with SSL_SetPKCS11PinArg is
+ * thus not required but good practice.
+ *
+ * NSS doesn't provide a default callback like OpenSSL does, but a callback is
+ * required to be set.  The password callback can be installed at any time, but
+ * setting the private data with SSL_SetPKCS11PinArg requires a PR Filedesc.
+ */
+static void
+default_nss_tls_init(bool isServerStart)
+{
+	/*
+	 * No user-defined callback has been configured, install the dummy call-
+	 * back since we must set something.
+	 */
+	if (!ssl_passphrase_command[0])
+		PK11_SetPasswordFunc(dummy_ssl_passphrase_cb);
+	else
+	{
+		/*
+		 * There is a user-defined callback, set it unless we are in a restart
+		 * and cannot handle restarts due to an interactive callback.
+		 */
+		if (isServerStart)
+			PK11_SetPasswordFunc(external_ssl_passphrase_cb);
+		else
+		{
+			if (ssl_passphrase_command_supports_reload)
+				PK11_SetPasswordFunc(external_ssl_passphrase_cb);
+			else
+				PK11_SetPasswordFunc(dummy_ssl_passphrase_cb);
+		}
+	}
+}
+
+/*
+ * external_ssl_passphrase_cb
+ *
+ * Runs the callback configured by ssl_passphrase_command and returns the
+ * captured password back to NSS.
+ */
+static char *
+external_ssl_passphrase_cb(PK11SlotInfo *slot, PRBool retry, void *arg)
+{
+	/*
+	 * NSS use a hardcoded 256 byte buffer for reading the password so set the
+	 * same limit for our callback buffer.
+	 */
+	char		buf[256];
+	int			len;
+	char	   *password = NULL;
+	char	   *prompt;
+
+	/*
+	 * Since there is no password callback in NSS when the server starts up,
+	 * it makes little sense to create an interactive callback. Thus, if this
+	 * is a retry attempt then give up immediately.
+	 */
+	if (retry)
+		return NULL;
+
+	/*
+	 * Construct the same prompt that NSS uses internally even though it is
+	 * unlikely to serve much purpose, but we must set a prompt so we might as
+	 * well do it right.
+	 */
+	prompt = psprintf("Enter Password or Pin for \"%s\":",
+					  PK11_GetTokenName(slot));
+
+	len = run_ssl_passphrase_command(prompt, ssl_is_server_start, buf, sizeof(buf));
+	pfree(prompt);
+
+	if (!len)
+		return NULL;
+
+	/*
+	 * At least one byte with password content was returned, and NSS requires
+	 * that we return it allocated in NSS controlled memory. If we fail to
+	 * allocate then abort without passing back NULL and bubble up the error
+	 * on the PG side.
+	 */
+	password = (char *) PR_Malloc(len + 1);
+	if (!password)
+	{
+		explicit_bzero(buf, sizeof(buf));
+		ereport(ERROR,
+				(errcode(ERRCODE_OUT_OF_MEMORY),
+				 errmsg("out of memory")));
+	}
+	strlcpy(password, buf, sizeof(password));
+	explicit_bzero(buf, sizeof(buf));
+
+	return password;
+}
+
+/*
+ * dummy_ssl_passphrase_cb
+ *
+ * Return unsuccessful if we are asked to provide the passphrase for a cert or
+ * key, without having a passphrase callback installed.
+ */
+static char *
+dummy_ssl_passphrase_cb(PK11SlotInfo *slot, PRBool retry, void *arg)
+{
+	dummy_ssl_passwd_cb_called = true;
+	return NULL;
+}
+
+static SECStatus
+pg_bad_cert_handler(void *arg, PRFileDesc *fd)
+{
+	Port	   *port = (Port *) arg;
+
+	port->peer_cert_valid = false;
+	return SECFailure;
+}
+
+/*
+ * raw_subject_common_name
+ *
+ * Returns the Subject Common Name for the given certificate as a raw char
+ * buffer (that is, without any form of escaping for unprintable characters or
+ * embedded nulls), with the length of the buffer returned in the len param.
+ * The buffer is allocated in the TopMemoryContext and is given a NULL
+ * terminator so that callers are safe to call strlen() on it.
+ *
+ * This is used instead of CERT_GetCommonName(), which always performs quoting
+ * and/or escaping. NSS doesn't appear to give us a way to easily unescape the
+ * result, and we need to store the raw CN into port->peer_cn for compatibility
+ * with the OpenSSL implementation.
+ */
+static char *
+raw_subject_common_name(CERTCertificate *cert, unsigned int *len)
+{
+	CERTName	subject = cert->subject;
+	CERTRDN	  **rdn;
+
+	for (rdn = subject.rdns; *rdn; rdn++)
+	{
+		CERTAVA	  **ava;
+
+		for (ava = (*rdn)->avas; *ava; ava++)
+		{
+			SECItem	   *buf;
+			char	   *cn;
+
+			if (CERT_GetAVATag(*ava) != SEC_OID_AVA_COMMON_NAME)
+				continue;
+
+			/* Found a CN, ecode and copy it into a newly allocated buffer */
+			buf = CERT_DecodeAVAValue(&(*ava)->value);
+			if (!buf)
+			{
+				/*
+				 * This failure case is difficult to test. (Since this code
+				 * runs after certificate authentication has otherwise
+				 * succeeded, you'd need to convince a CA implementation to
+				 * sign a corrupted certificate in order to get here.)
+				 *
+				 * Follow the behavior of CERT_GetCommonName() in this case and
+				 * simply return NULL, as if a Common Name had not been found.
+				 */
+				goto fail;
+			}
+
+			cn = MemoryContextAlloc(TopMemoryContext, buf->len + 1);
+			memcpy(cn, buf->data, buf->len);
+			cn[buf->len] = '\0';
+
+			*len = buf->len;
+
+			SECITEM_FreeItem(buf, PR_TRUE);
+			return cn;
+		}
+	}
+
+fail:
+	/* Not found. */
+	*len = 0;
+	return NULL;
+}
+
+/*
+ * pg_cert_auth_handler
+ *
+ * Callback for validation of incoming certificates. Returning SECFailure will
+ * cause NSS to terminate the connection immediately.
+ */
+static SECStatus
+pg_cert_auth_handler(void *arg, PRFileDesc *fd, PRBool checksig, PRBool isServer)
+{
+	SECStatus	status;
+	Port	   *port = (Port *) arg;
+	CERTCertificate *cert;
+	char	   *peer_cn;
+	unsigned int len;
+
+	status = SSL_AuthCertificate(CERT_GetDefaultCertDB(), port->pr_fd, checksig, PR_TRUE);
+	if (status != SECSuccess)
+		return status;
+
+	port->peer_cn = NULL;
+	port->peer_cert_valid = false;
+
+	cert = SSL_PeerCertificate(port->pr_fd);
+	if (!cert)
+	{
+		/* Shouldn't be possible; why did we get a client cert callback? */
+		Assert(cert != NULL);
+
+		PR_SetError(SEC_ERROR_LIBRARY_FAILURE, 0);
+		return SECFailure;
+	}
+
+	peer_cn = raw_subject_common_name(cert, &len);
+	if (!peer_cn)
+	{
+		/* No Common Name, but the certificate otherwise checks out. */
+		port->peer_cert_valid = true;
+
+		status = SECSuccess;
+		goto cleanup;
+	}
+
+	/*
+	 * Reject embedded NULLs in certificate common name to prevent attacks like
+	 * CVE-2009-4034.
+	 */
+	if (len != strlen(peer_cn))
+	{
+		ereport(COMMERROR,
+				(errcode(ERRCODE_PROTOCOL_VIOLATION),
+				 errmsg("SSL certificate's common name contains embedded null")));
+
+		pfree(peer_cn);
+		PR_SetError(SEC_ERROR_CERT_NOT_VALID, 0);
+
+		status = SECFailure;
+		goto cleanup;
+	}
+
+	port->peer_cn = peer_cn;
+	port->peer_cert_valid = true;
+
+	status = SECSuccess;
+
+cleanup:
+	CERT_DestroyCertificate(cert);
+	return status;
+}
+
+static PRInt32
+pg_ssl_read(PRFileDesc *fd, void *buf, PRInt32 amount, PRIntn flags,
+			PRIntervalTime timeout)
+{
+	PRRecvFN	read_fn;
+	PRInt32		n_read;
+
+	read_fn = fd->lower->methods->recv;
+	n_read = read_fn(fd->lower, buf, amount, flags, timeout);
+
+	return n_read;
+}
+
+static PRInt32
+pg_ssl_write(PRFileDesc *fd, const void *buf, PRInt32 amount, PRIntn flags,
+			 PRIntervalTime timeout)
+{
+	PRSendFN	send_fn;
+	PRInt32		n_write;
+
+	send_fn = fd->lower->methods->send;
+	n_write = send_fn(fd->lower, buf, amount, flags, timeout);
+
+	return n_write;
+}
+
+static PRStatus
+pg_ssl_close(PRFileDesc *fd)
+{
+	/*
+	 * Disconnect our private Port from the fd before closing out the stack.
+	 * (Debug builds of NSPR will assert if we do not.)
+	 */
+	fd->secret = NULL;
+	return PR_GetDefaultIOMethods()->close(fd);
+}
+
+static PRFileDesc *
+init_iolayer(Port *port)
+{
+	const		PRIOMethods *default_methods;
+	PRFileDesc *layer;
+
+	/*
+	 * Start by initializing our layer with all the default methods so that we
+	 * can selectively override the ones we want while still ensuring that we
+	 * have a complete layer specification.
+	 */
+	default_methods = PR_GetDefaultIOMethods();
+	memcpy(&pr_iomethods, default_methods, sizeof(PRIOMethods));
+
+	pr_iomethods.recv = pg_ssl_read;
+	pr_iomethods.send = pg_ssl_write;
+	pr_iomethods.close = pg_ssl_close;
+
+	/*
+	 * Each IO layer must be identified by a unique name, where uniqueness is
+	 * per connection. Each connection in a postgres cluster can generate the
+	 * identity from the same string as they will create their IO layers on
+	 * different sockets. Only one layer per socket can have the same name.
+	 */
+	pr_id = PR_GetUniqueIdentity("PostgreSQL Server");
+	if (pr_id == PR_INVALID_IO_LAYER)
+	{
+		ereport(ERROR,
+				(errmsg("out of memory when setting up TLS connection")));
+		return NULL;
+	}
+
+	/*
+	 * Create the actual IO layer as a stub such that it can be pushed onto
+	 * the layer stack. The step via a stub is required as we define custom
+	 * callbacks.
+	 */
+	layer = PR_CreateIOLayerStub(pr_id, &pr_iomethods);
+	if (!layer)
+	{
+		ereport(ERROR,
+				(errmsg("unable to create NSS I/O layer")));
+		return NULL;
+	}
+
+	/* Store the Port as private data available in callbacks */
+	layer->secret = (void *) port;
+
+	return layer;
+}
+
+static char *
+ssl_protocol_version_to_string(int v)
+{
+	switch (v)
+	{
+			/* SSL v2 and v3 are not supported */
+		case SSL_LIBRARY_VERSION_2:
+		case SSL_LIBRARY_VERSION_3_0:
+			Assert(false);
+			break;
+
+		case SSL_LIBRARY_VERSION_TLS_1_0:
+			return pstrdup("TLSv1.0");
+		case SSL_LIBRARY_VERSION_TLS_1_1:
+			return pstrdup("TLSv1.1");
+		case SSL_LIBRARY_VERSION_TLS_1_2:
+			return pstrdup("TLSv1.2");
+		case SSL_LIBRARY_VERSION_TLS_1_3:
+			return pstrdup("TLSv1.3");
+	}
+
+	return pstrdup("unknown");
+}
+
+
+/*
+ * ssl_protocol_version_to_nss
+ *			Translate PostgreSQL TLS version to NSS version
+ *
+ * Returns zero in case the requested TLS version is undefined (PG_ANY) and
+ * should be set by the caller, or -1 on failure.
+ */
+static uint16
+ssl_protocol_version_to_nss(int v, const char *guc_name)
+{
+	switch (v)
+	{
+			/*
+			 * There is no SSL_LIBRARY_ macro defined in NSS with the value
+			 * zero, so we use this to signal the caller that the highest
+			 * useful version should be set on the connection.
+			 */
+		case PG_TLS_ANY:
+			return 0;
+
+			/*
+			 * No guard is required here as there are no versions of NSS
+			 * without support for TLS1.
+			 */
+		case PG_TLS1_VERSION:
+			return SSL_LIBRARY_VERSION_TLS_1_0;
+		case PG_TLS1_1_VERSION:
+#ifdef SSL_LIBRARY_VERSION_TLS_1_1
+			return SSL_LIBRARY_VERSION_TLS_1_1;
+#else
+			break;
+#endif
+		case PG_TLS1_2_VERSION:
+#ifdef SSL_LIBRARY_VERSION_TLS_1_2
+			return SSL_LIBRARY_VERSION_TLS_1_2;
+#else
+			break;
+#endif
+		case PG_TLS1_3_VERSION:
+#ifdef SSL_LIBRARY_VERSION_TLS_1_3
+			return SSL_LIBRARY_VERSION_TLS_1_3;
+#else
+			break;
+#endif
+		default:
+			break;
+	}
+
+	return -1;
+}
+
+/*
+ * pg_SSLerrmessage
+ *		Create and return a human readable error message given
+ *		the specified error code
+ *
+ * PR_ErrorToName only converts the enum identifier of the error to string,
+ * but that can be quite useful for debugging (and in case PR_ErrorToString is
+ * unable to render a message then we at least have something).
+ */
+static char *
+pg_SSLerrmessage(PRErrorCode errcode)
+{
+	return psprintf("%s (%s)",
+					PR_ErrorToString(errcode, PR_LANGUAGE_I_DEFAULT),
+					PR_ErrorToName(errcode));
+}
+
+/*
+ * pg_SSLShutdownFunc
+ *		Callback for NSS shutdown
+ *
+ * If NSS is terminated from the outside when the connection is still in use
+ * we must treat this as potentially hostile and immediately close to avoid
+ * leaking the connection in any way. Once this is called, NSS will shutdown
+ * regardless so we may as well clean up the best we can. Returning SECFailure
+ * will cause the NSS shutdown to return with an error, but it will shutdown
+ * nevertheless. nss_data is reserved for future use and is always NULL.
+ */
+static SECStatus
+pg_SSLShutdownFunc(void *private_data, void *nss_data)
+{
+	Port *port = (Port *) private_data;
+
+	if (!port || !port->ssl_in_use)
+		return SECSuccess;
+
+	/*
+	 * There is a connection still open, close it and signal to whatever that
+	 * called the shutdown that it was erroneous.
+	 */
+	be_tls_close(port);
+	be_tls_destroy();
+
+	return SECFailure;
+}
diff --git a/src/backend/libpq/be-secure.c b/src/backend/libpq/be-secure.c
index bb603ad209..43a5c5de42 100644
--- a/src/backend/libpq/be-secure.c
+++ b/src/backend/libpq/be-secure.c
@@ -50,6 +50,9 @@ bool		ssl_passphrase_command_supports_reload;
 #ifdef USE_SSL
 bool		ssl_loaded_verify_locations = false;
 #endif
+#ifdef USE_NSS
+char	   *ssl_database;
+#endif
 
 /* GUC variable controlling SSL cipher list */
 char	   *SSLCipherSuites = NULL;
diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c
index 4bcf705a30..b6f980e35b 100644
--- a/src/backend/utils/misc/guc.c
+++ b/src/backend/utils/misc/guc.c
@@ -4309,7 +4309,11 @@ static struct config_string ConfigureNamesString[] =
 		},
 		&ssl_library,
 #ifdef USE_SSL
+#if defined(USE_OPENSSL)
 		"OpenSSL",
+#elif defined(USE_NSS)
+		"NSS",
+#endif
 #else
 		"",
 #endif
@@ -4377,6 +4381,18 @@ static struct config_string ConfigureNamesString[] =
 		check_canonical_path, assign_pgstat_temp_directory, NULL
 	},
 
+#ifdef USE_NSS
+	{
+		{"ssl_database", PGC_SIGHUP, CONN_AUTH_SSL,
+			gettext_noop("Location of the NSS certificate database."),
+			NULL
+		},
+		&ssl_database,
+		"",
+		NULL, NULL, NULL
+	},
+#endif
+
 	{
 		{"synchronous_standby_names", PGC_SIGHUP, REPLICATION_PRIMARY,
 			gettext_noop("Number of synchronous standbys and list of names of potential synchronous ones."),
@@ -4405,8 +4421,10 @@ static struct config_string ConfigureNamesString[] =
 			GUC_SUPERUSER_ONLY
 		},
 		&SSLCipherSuites,
-#ifdef USE_OPENSSL
+#if defined(USE_OPENSSL)
 		"HIGH:MEDIUM:+3DES:!aNULL",
+#elif defined (USE_NSS)
+		"",
 #else
 		"none",
 #endif
diff --git a/src/common/cipher_nss.c b/src/common/cipher_nss.c
new file mode 100644
index 0000000000..9799fef32d
--- /dev/null
+++ b/src/common/cipher_nss.c
@@ -0,0 +1,192 @@
+/*-------------------------------------------------------------------------
+ *
+ * cipher_nss.c
+ *	  NSS functionality shared between frontend and backend for working
+ *	  with ciphers
+ *
+ * This should only bse used if code is compiled with NSS support.
+ *
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ *        src/common/cipher_nss.c
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#ifndef FRONTEND
+#include "postgres.h"
+#else
+#include "postgres_fe.h"
+#endif
+
+#include "common/nss.h"
+
+#define INVALID_CIPHER	0xFFFF
+
+typedef struct
+{
+	SECOidTag	signature;
+	SECOidTag	hash;
+	int			len;
+}			NSSSignatureAlgorithm;
+
+static const NSSSignatureAlgorithm NSS_SCRAMDigestAlgorithm[] = {
+
+	{SEC_OID_PKCS1_MD5_WITH_RSA_ENCRYPTION, SEC_OID_SHA256, SHA256_LENGTH},
+	{SEC_OID_PKCS1_SHA1_WITH_RSA_ENCRYPTION, SEC_OID_SHA256, SHA256_LENGTH},
+	{SEC_OID_ISO_SHA_WITH_RSA_SIGNATURE, SEC_OID_SHA256, SHA256_LENGTH},
+	{SEC_OID_ISO_SHA1_WITH_RSA_SIGNATURE, SEC_OID_SHA256, SHA256_LENGTH},
+	{SEC_OID_PKCS5_PBE_WITH_MD5_AND_DES_CBC, SEC_OID_SHA256, SHA256_LENGTH},
+
+	{SEC_OID_ANSIX962_ECDSA_SHA224_SIGNATURE, SEC_OID_SHA224, SHA224_LENGTH},
+	{SEC_OID_PKCS1_SHA224_WITH_RSA_ENCRYPTION, SEC_OID_SHA224, SHA224_LENGTH},
+	{SEC_OID_NIST_DSA_SIGNATURE_WITH_SHA224_DIGEST, SEC_OID_SHA224, SHA224_LENGTH},
+
+	{SEC_OID_ANSIX962_ECDSA_SHA256_SIGNATURE, SEC_OID_SHA256, SHA256_LENGTH},
+	{SEC_OID_PKCS1_SHA256_WITH_RSA_ENCRYPTION, SEC_OID_SHA256, SHA256_LENGTH},
+	{SEC_OID_NIST_DSA_SIGNATURE_WITH_SHA256_DIGEST, SEC_OID_SHA256, SHA256_LENGTH},
+
+	{SEC_OID_ANSIX962_ECDSA_SHA384_SIGNATURE, SEC_OID_SHA384, SHA384_LENGTH},
+	{SEC_OID_PKCS1_SHA384_WITH_RSA_ENCRYPTION, SEC_OID_SHA384, SHA384_LENGTH},
+
+	{SEC_OID_ANSIX962_ECDSA_SHA512_SIGNATURE, SEC_OID_SHA512, SHA512_LENGTH},
+	{SEC_OID_PKCS1_SHA512_WITH_RSA_ENCRYPTION, SEC_OID_SHA512, SHA512_LENGTH},
+
+	{0, 0}
+};
+
+typedef struct
+{
+	const char *name;
+	PRUint16	number;
+}			NSSCiphers;
+
+/*
+ * This list is a partial copy of the ciphers in NSS files lib/ssl/sslproto.h
+ * in order to provide a human readable version of the ciphers. It would be
+ * nice to not have to have this, but NSS doesn't provide any API addressing
+ * the ciphers by name. TODO: do we want more of the ciphers, or perhaps less?
+ */
+static const NSSCiphers NSS_CipherList[] = {
+
+	{"TLS_NULL_WITH_NULL_NULL", TLS_NULL_WITH_NULL_NULL},
+
+	{"TLS_RSA_WITH_NULL_MD5", TLS_RSA_WITH_NULL_MD5},
+	{"TLS_RSA_WITH_NULL_SHA", TLS_RSA_WITH_NULL_SHA},
+	{"TLS_RSA_WITH_RC4_128_MD5", TLS_RSA_WITH_RC4_128_MD5},
+	{"TLS_RSA_WITH_RC4_128_SHA", TLS_RSA_WITH_RC4_128_SHA},
+	{"TLS_RSA_WITH_IDEA_CBC_SHA", TLS_RSA_WITH_IDEA_CBC_SHA},
+	{"TLS_RSA_WITH_DES_CBC_SHA", TLS_RSA_WITH_DES_CBC_SHA},
+	{"TLS_RSA_WITH_3DES_EDE_CBC_SHA", TLS_RSA_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_DH_DSS_WITH_DES_CBC_SHA", TLS_DH_DSS_WITH_DES_CBC_SHA},
+	{"TLS_DH_DSS_WITH_3DES_EDE_CBC_SHA", TLS_DH_DSS_WITH_3DES_EDE_CBC_SHA},
+	{"TLS_DH_RSA_WITH_DES_CBC_SHA", TLS_DH_RSA_WITH_DES_CBC_SHA},
+	{"TLS_DH_RSA_WITH_3DES_EDE_CBC_SHA", TLS_DH_RSA_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_DHE_DSS_WITH_DES_CBC_SHA", TLS_DHE_DSS_WITH_DES_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_3DES_EDE_CBC_SHA", TLS_DHE_DSS_WITH_3DES_EDE_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_DES_CBC_SHA", TLS_DHE_RSA_WITH_DES_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA", TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_DH_anon_WITH_RC4_128_MD5", TLS_DH_anon_WITH_RC4_128_MD5},
+	{"TLS_DH_anon_WITH_DES_CBC_SHA", TLS_DH_anon_WITH_DES_CBC_SHA},
+	{"TLS_DH_anon_WITH_3DES_EDE_CBC_SHA", TLS_DH_anon_WITH_3DES_EDE_CBC_SHA},
+
+	{"TLS_RSA_WITH_AES_128_CBC_SHA", TLS_RSA_WITH_AES_128_CBC_SHA},
+	{"TLS_DH_DSS_WITH_AES_128_CBC_SHA", TLS_DH_DSS_WITH_AES_128_CBC_SHA},
+	{"TLS_DH_RSA_WITH_AES_128_CBC_SHA", TLS_DH_RSA_WITH_AES_128_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_AES_128_CBC_SHA", TLS_DHE_DSS_WITH_AES_128_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_AES_128_CBC_SHA", TLS_DHE_RSA_WITH_AES_128_CBC_SHA},
+	{"TLS_DH_anon_WITH_AES_128_CBC_SHA", TLS_DH_anon_WITH_AES_128_CBC_SHA},
+
+	{"TLS_RSA_WITH_AES_256_CBC_SHA", TLS_RSA_WITH_AES_256_CBC_SHA},
+	{"TLS_DH_DSS_WITH_AES_256_CBC_SHA", TLS_DH_DSS_WITH_AES_256_CBC_SHA},
+	{"TLS_DH_RSA_WITH_AES_256_CBC_SHA", TLS_DH_RSA_WITH_AES_256_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_AES_256_CBC_SHA", TLS_DHE_DSS_WITH_AES_256_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_AES_256_CBC_SHA", TLS_DHE_RSA_WITH_AES_256_CBC_SHA},
+	{"TLS_DH_anon_WITH_AES_256_CBC_SHA", TLS_DH_anon_WITH_AES_256_CBC_SHA},
+	{"TLS_RSA_WITH_NULL_SHA256", TLS_RSA_WITH_NULL_SHA256},
+	{"TLS_RSA_WITH_AES_128_CBC_SHA256", TLS_RSA_WITH_AES_128_CBC_SHA256},
+	{"TLS_RSA_WITH_AES_256_CBC_SHA256", TLS_RSA_WITH_AES_256_CBC_SHA256},
+
+	{"TLS_DHE_DSS_WITH_AES_128_CBC_SHA256", TLS_DHE_DSS_WITH_AES_128_CBC_SHA256},
+	{"TLS_RSA_WITH_CAMELLIA_128_CBC_SHA", TLS_RSA_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DH_DSS_WITH_CAMELLIA_128_CBC_SHA", TLS_DH_DSS_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DH_RSA_WITH_CAMELLIA_128_CBC_SHA", TLS_DH_RSA_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_CAMELLIA_128_CBC_SHA", TLS_DHE_DSS_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA", TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA},
+	{"TLS_DH_anon_WITH_CAMELLIA_128_CBC_SHA", TLS_DH_anon_WITH_CAMELLIA_128_CBC_SHA},
+
+	{"TLS_DHE_DSS_WITH_RC4_128_SHA", TLS_DHE_DSS_WITH_RC4_128_SHA},
+	{"TLS_DHE_RSA_WITH_AES_128_CBC_SHA256", TLS_DHE_RSA_WITH_AES_128_CBC_SHA256},
+	{"TLS_DHE_DSS_WITH_AES_256_CBC_SHA256", TLS_DHE_DSS_WITH_AES_256_CBC_SHA256},
+	{"TLS_DHE_RSA_WITH_AES_256_CBC_SHA256", TLS_DHE_RSA_WITH_AES_256_CBC_SHA256},
+
+	{"TLS_RSA_WITH_CAMELLIA_256_CBC_SHA", TLS_RSA_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DH_DSS_WITH_CAMELLIA_256_CBC_SHA", TLS_DH_DSS_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DH_RSA_WITH_CAMELLIA_256_CBC_SHA", TLS_DH_RSA_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DHE_DSS_WITH_CAMELLIA_256_CBC_SHA", TLS_DHE_DSS_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA", TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA},
+	{"TLS_DH_anon_WITH_CAMELLIA_256_CBC_SHA", TLS_DH_anon_WITH_CAMELLIA_256_CBC_SHA},
+
+	{"TLS_RSA_WITH_SEED_CBC_SHA", TLS_RSA_WITH_SEED_CBC_SHA},
+
+	{"TLS_RSA_WITH_AES_128_GCM_SHA256", TLS_RSA_WITH_AES_128_GCM_SHA256},
+	{"TLS_RSA_WITH_AES_256_GCM_SHA384", TLS_RSA_WITH_AES_256_GCM_SHA384},
+	{"TLS_DHE_RSA_WITH_AES_128_GCM_SHA256", TLS_DHE_RSA_WITH_AES_128_GCM_SHA256},
+	{"TLS_DHE_RSA_WITH_AES_256_GCM_SHA384", TLS_DHE_RSA_WITH_AES_256_GCM_SHA384},
+	{"TLS_DHE_DSS_WITH_AES_128_GCM_SHA256", TLS_DHE_DSS_WITH_AES_128_GCM_SHA256},
+	{"TLS_DHE_DSS_WITH_AES_256_GCM_SHA384", TLS_DHE_DSS_WITH_AES_256_GCM_SHA384},
+
+	{"TLS_AES_128_GCM_SHA256", TLS_AES_128_GCM_SHA256},
+	{"TLS_AES_256_GCM_SHA384", TLS_AES_256_GCM_SHA384},
+	{"TLS_CHACHA20_POLY1305_SHA256", TLS_CHACHA20_POLY1305_SHA256},
+	{NULL, 0}
+};
+
+/*
+ * pg_find_cipher
+ *			Translate an NSS ciphername to the cipher code
+ *
+ * Searches the configured ciphers for the corresponding cipher code to the
+ * name. Search is performed case insensitive.
+ */
+bool
+pg_find_cipher(char *name, PRUint16 *cipher)
+{
+	const		NSSCiphers *cipher_list;
+
+	for (cipher_list = NSS_CipherList; cipher_list->name; cipher_list++)
+	{
+		if (pg_strcasecmp(cipher_list->name, name) == 0)
+		{
+			*cipher = cipher_list->number;
+			return true;
+		}
+	}
+
+	return false;
+}
+
+bool
+pg_find_signature_algorithm(SECOidTag signature, SECOidTag *algorithm, int *len)
+{
+	const NSSSignatureAlgorithm *candidate;
+
+	candidate = NSS_SCRAMDigestAlgorithm;
+
+	for (candidate = NSS_SCRAMDigestAlgorithm; candidate->signature; candidate++)
+	{
+		if (signature == candidate->signature)
+		{
+			*algorithm = candidate->hash;
+			*len = candidate->len;
+			return true;
+		}
+	}
+
+	return false;
+}
diff --git a/src/include/common/nss.h b/src/include/common/nss.h
new file mode 100644
index 0000000000..a361dd1f68
--- /dev/null
+++ b/src/include/common/nss.h
@@ -0,0 +1,49 @@
+/*-------------------------------------------------------------------------
+ *
+ * nss.h
+ *	  NSS supporting functionality shared between frontend and backend
+ *
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ *		  src/include/common/nss.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef COMMON_NSS_H
+#define COMMON_NSS_H
+
+#ifdef USE_NSS
+
+/*
+ * BITS_PER_BYTE is also defined in the NSPR header files, so we need to undef
+ * our version to avoid compiler warnings on redefinition.
+ */
+#define pg_BITS_PER_BYTE BITS_PER_BYTE
+#undef BITS_PER_BYTE
+/*
+ * The nspr/obsolete/protypes.h NSPR header typedefs uint64 and int64 with
+ * colliding definitions from ours, causing a much expected compiler error.
+ * Remove backwards compatibility with ancient NSPR versions to avoid this.
+ */
+#define NO_NSPR_10_SUPPORT
+#include <nspr/nspr.h>
+#include <nspr/prerror.h>
+#include <nspr/prio.h>
+#include <nspr/prmem.h>
+#include <nspr/prtypes.h>
+
+
+#include <nss/nss.h>
+#include <nss/hasht.h>
+#include <nss/secoidt.h>
+#include <nss/sslproto.h>
+
+/* src/common/cipher_nss.c */
+bool pg_find_cipher(char *name, PRUint16 *cipher);
+bool pg_find_signature_algorithm(SECOidTag signature, SECOidTag *digest, int *len);
+
+#endif							/* USE_NSS */
+
+#endif							/* COMMON_NSS_H */
diff --git a/src/include/libpq/libpq-be.h b/src/include/libpq/libpq-be.h
index 7be1a67d69..eb00d9152b 100644
--- a/src/include/libpq/libpq-be.h
+++ b/src/include/libpq/libpq-be.h
@@ -200,6 +200,10 @@ typedef struct Port
 	SSL		   *ssl;
 	X509	   *peer;
 #endif
+
+#ifdef USE_NSS
+	void	   *pr_fd;
+#endif
 } Port;
 
 #ifdef USE_SSL
@@ -283,7 +287,7 @@ extern void be_tls_get_peer_serial(Port *port, char *ptr, size_t len);
  * This is not supported with old versions of OpenSSL that don't have
  * the X509_get_signature_nid() function.
  */
-#if defined(USE_OPENSSL) && defined(HAVE_X509_GET_SIGNATURE_NID)
+#if defined(USE_NSS) || (defined(USE_OPENSSL) && defined(HAVE_X509_GET_SIGNATURE_NID))
 #define HAVE_BE_TLS_GET_CERTIFICATE_HASH
 extern char *be_tls_get_certificate_hash(Port *port, size_t *len);
 #endif
@@ -293,6 +297,10 @@ extern char *be_tls_get_certificate_hash(Port *port, size_t *len);
 typedef void (*openssl_tls_init_hook_typ) (SSL_CTX *context, bool isServerStart);
 extern PGDLLIMPORT openssl_tls_init_hook_typ openssl_tls_init_hook;
 #endif
+#ifdef USE_NSS
+typedef void (*nss_tls_init_hook_type) (bool isServerStart);
+extern PGDLLIMPORT nss_tls_init_hook_type nss_tls_init_hook;
+#endif
 
 #endif							/* USE_SSL */
 
diff --git a/src/include/libpq/libpq.h b/src/include/libpq/libpq.h
index e4e5c21565..ba31623a5b 100644
--- a/src/include/libpq/libpq.h
+++ b/src/include/libpq/libpq.h
@@ -92,6 +92,9 @@ extern PGDLLIMPORT bool ssl_passphrase_command_supports_reload;
 #ifdef USE_SSL
 extern bool ssl_loaded_verify_locations;
 #endif
+#ifdef USE_NSS
+extern char *ssl_database;
+#endif
 
 extern int	secure_initialize(bool isServerStart);
 extern bool secure_loaded_verify_locations(void);
diff --git a/src/include/pg_config_manual.h b/src/include/pg_config_manual.h
index f10ad0acd6..6e901beba1 100644
--- a/src/include/pg_config_manual.h
+++ b/src/include/pg_config_manual.h
@@ -178,7 +178,7 @@
  * USE_SSL code should be compiled only when compiling with an SSL
  * implementation.
  */
-#ifdef USE_OPENSSL
+#if defined(USE_OPENSSL) || defined(USE_NSS)
 #define USE_SSL
 #endif
 
diff --git a/src/interfaces/libpq/fe-connect.c b/src/interfaces/libpq/fe-connect.c
index 9812a14662..93124f8d42 100644
--- a/src/interfaces/libpq/fe-connect.c
+++ b/src/interfaces/libpq/fe-connect.c
@@ -359,6 +359,10 @@ static const internalPQconninfoOption PQconninfoOptions[] = {
 		"Target-Session-Attrs", "", 15, /* sizeof("prefer-standby") = 15 */
 	offsetof(struct pg_conn, target_session_attrs)},
 
+	{"cert_database", NULL, NULL, NULL,
+		"CertificateDatabase", "", 64,
+	offsetof(struct pg_conn, cert_database)},
+
 	/* Terminating entry --- MUST BE LAST */
 	{NULL, NULL, NULL, NULL,
 	NULL, NULL, 0}
diff --git a/src/interfaces/libpq/fe-secure-nss.c b/src/interfaces/libpq/fe-secure-nss.c
new file mode 100644
index 0000000000..72b0c54d1c
--- /dev/null
+++ b/src/interfaces/libpq/fe-secure-nss.c
@@ -0,0 +1,1088 @@
+/*-------------------------------------------------------------------------
+ *
+ * fe-secure-nss.c
+ *	  functions for supporting NSS as a TLS backend for frontend libpq
+ *
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ *	  src/interfaces/libpq/fe-secure-nss.c
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#include "postgres_fe.h"
+
+#include "libpq-fe.h"
+#include "fe-auth.h"
+#include "fe-secure-common.h"
+#include "libpq-int.h"
+#include "common/nss.h"
+
+/*
+ * The nspr/obsolete/protypes.h NSPR header typedefs uint64 and int64 with
+ * colliding definitions from ours, causing a much expected compiler error.
+ * Remove backwards compatibility with ancient NSPR versions to avoid this.
+ */
+#define NO_NSPR_10_SUPPORT
+#include <nspr/nspr.h>
+#include <nspr/prerror.h>
+#include <nspr/prinit.h>
+#include <nspr/prio.h>
+
+#include <nss/hasht.h>
+#include <nss/nss.h>
+#include <nss/ssl.h>
+#include <nss/sslproto.h>
+#include <nss/pk11func.h>
+#include <nss/secerr.h>
+#include <nss/secoidt.h>
+#include <nss/secmod.h>
+
+static SECStatus pg_load_nss_module(SECMODModule **module, const char *library, const char *name);
+static SECStatus pg_bad_cert_handler(void *arg, PRFileDesc *fd);
+static const char *pg_SSLerrmessage(PRErrorCode errcode);
+static SECStatus pg_client_auth_handler(void *arg, PRFileDesc *socket, CERTDistNames *caNames,
+										CERTCertificate **pRetCert, SECKEYPrivateKey **pRetKey);
+static SECStatus pg_cert_auth_handler(void *arg, PRFileDesc *fd, PRBool checksig, PRBool isServer);
+static int	ssl_protocol_version_to_nss(const char *protocol);
+static bool cert_database_has_CA(PGconn *conn);
+
+static char *PQssl_passwd_cb(PK11SlotInfo *slot, PRBool retry, void *arg);
+
+/*
+ * PR_ImportTCPSocket() is a private API, but very widely used, as it's the
+ * only way to make NSS use an already set up POSIX file descriptor rather
+ * than opening one itself. To quote the NSS documentation:
+ *
+ *		"In theory, code that uses PR_ImportTCPSocket may break when NSPR's
+ *		implementation changes. In practice, this is unlikely to happen because
+ *		NSPR's implementation has been stable for years and because of NSPR's
+ *		strong commitment to backward compatibility."
+ *
+ * https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSPR/Reference/PR_ImportTCPSocket
+ *
+ * The function is declared in <private/pprio.h>, but as it is a header marked
+ * private we declare it here rather than including it.
+ */
+NSPR_API(PRFileDesc *) PR_ImportTCPSocket(int);
+
+static SECMODModule *ca_trust = NULL;
+
+/*
+ * This logic exist in NSS as well, but it's only available for when there is
+ * a database to open, and not only using the system trust store. Thus, we
+ * need to keep our own copy.
+ */
+#if defined(WIN32)
+static const char *ca_trust_name = "nssckbi.dll";
+#elif defined(__darwin__)
+static const char *ca_trust_name = "libnssckbi.dylib";
+#else
+static const char *ca_trust_name = "libnssckbi.so";
+#endif
+
+static PQsslKeyPassHook_nss_type PQsslKeyPassHook = NULL;
+
+/* ------------------------------------------------------------ */
+/*			 Procedures common to all secure sessions			*/
+/* ------------------------------------------------------------ */
+
+/*
+ * pgtls_init_library
+ *
+ * There is no direct equivalent for PQinitOpenSSL in NSS/NSPR, with PR_Init
+ * being the closest match there is. PR_Init is however already documented to
+ * not be required so simply making this a noop seems like the best option.
+ */
+void
+pgtls_init_library(bool do_ssl, int do_crypto)
+{
+	/* noop */
+}
+
+int
+pgtls_init(PGconn *conn)
+{
+	conn->nss_context = NULL;
+
+	conn->ssl_in_use = false;
+	conn->has_password = false;
+
+	return 0;
+}
+
+void
+pgtls_close(PGconn *conn)
+{
+	if (conn->nss_context)
+	{
+		NSS_ShutdownContext(conn->nss_context);
+		conn->nss_context = NULL;
+	}
+}
+
+PostgresPollingStatusType
+pgtls_open_client(PGconn *conn)
+{
+	SECStatus	status;
+	PRFileDesc *pr_fd;
+	PRFileDesc *model;
+	NSSInitParameters params;
+	SSLVersionRange desired_range;
+
+	/*
+	 * The NSPR documentation states that runtime initialization via PR_Init
+	 * is no longer required, as the first caller into NSPR will perform the
+	 * initialization implicitly. See be-secure-nss.c for further discussion
+	 * on PR_Init.
+	 */
+	PR_Init(PR_USER_THREAD, PR_PRIORITY_NORMAL, 0);
+
+	/*
+	 * NSS initialization and the use of contexts is further discussed in
+	 * be-secure-nss.c
+	 */
+	memset(&params, 0, sizeof(params));
+	params.length = sizeof(params);
+
+	if (conn->cert_database && strlen(conn->cert_database) > 0)
+	{
+		char	   *cert_database_path = psprintf("sql:%s", conn->cert_database);
+
+		conn->nss_context = NSS_InitContext(cert_database_path, "", "", "",
+											&params,
+											NSS_INIT_READONLY | NSS_INIT_PK11RELOAD);
+		pfree(cert_database_path);
+
+		if (!conn->nss_context)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("unable to open certificate database \"%s\": %s"),
+							  conn->cert_database,
+							  pg_SSLerrmessage(PR_GetError()));
+			return PGRES_POLLING_FAILED;
+		}
+	}
+	else
+	{
+		conn->nss_context = NSS_InitContext("", "", "", "", &params,
+											NSS_INIT_READONLY | NSS_INIT_NOCERTDB |
+											NSS_INIT_NOMODDB | NSS_INIT_FORCEOPEN |
+											NSS_INIT_NOROOTINIT | NSS_INIT_PK11RELOAD);
+		if (!conn->nss_context)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("unable to create certificate database: %s"),
+							  pg_SSLerrmessage(PR_GetError()));
+			return PGRES_POLLING_FAILED;
+		}
+	}
+
+	/*
+	 * Configure cipher policy.
+	 */
+	status = NSS_SetDomesticPolicy();
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to configure cipher policy: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * If we don't have a certificate database, the system trust store is the
+	 * fallback we can use. If we fail to initialize that as well, we can
+	 * still attempt a connection as long as the sslmode isn't verify*.
+	 */
+	if (!conn->cert_database && conn->sslmode[0] == 'v')
+	{
+		status = pg_load_nss_module(&ca_trust, ca_trust_name, "\"Root Certificates\"");
+		if (status != SECSuccess)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("WARNING: unable to load NSS trust module \"%s\" : %s"),
+							  ca_trust_name,
+							  pg_SSLerrmessage(PR_GetError()));
+
+			return PGRES_POLLING_FAILED;
+		}
+	}
+
+
+	PK11_SetPasswordFunc(PQssl_passwd_cb);
+
+	/*
+	 * Import the already opened socket as we don't want to use NSPR functions
+	 * for opening the network socket due to how the PostgreSQL protocol works
+	 * with TLS connections. This function is not part of the NSPR public API,
+	 * see the comment at the top of the file for the rationale of still using
+	 * it.
+	 */
+	pr_fd = PR_ImportTCPSocket(conn->sock);
+	if (!pr_fd)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to attach to socket: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * Most of the documentation available, and implementations of, NSS/NSPR
+	 * use the PR_NewTCPSocket() function here, which has the drawback that it
+	 * can only create IPv4 sockets. Instead use PR_OpenTCPSocket() which
+	 * copes with IPv6 as well.
+	 */
+	model = SSL_ImportFD(NULL, PR_OpenTCPSocket(conn->laddr.addr.ss_family));
+	if (!model)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to enable TLS: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/* Disable old protocol versions (SSLv2 and SSLv3) */
+	SSL_OptionSet(model, SSL_ENABLE_SSL2, PR_FALSE);
+	SSL_OptionSet(model, SSL_V2_COMPATIBLE_HELLO, PR_FALSE);
+	SSL_OptionSet(model, SSL_ENABLE_SSL3, PR_FALSE);
+
+#ifdef SSL_CBC_RANDOM_IV
+
+	/*
+	 * Enable protection against the BEAST attack in case the NSS library has
+	 * support for that. While SSLv3 is disabled, we may still allow TLSv1
+	 * which is affected. The option isn't documented as an SSL option, but as
+	 * an NSS environment variable.
+	 */
+	SSL_OptionSet(model, SSL_CBC_RANDOM_IV, PR_TRUE);
+#endif
+
+	/* Set us up as a TLS client for the handshake */
+	SSL_OptionSet(model, SSL_HANDSHAKE_AS_CLIENT, PR_TRUE);
+
+	/*
+	 * When setting the available protocols, we either use the user defined
+	 * configuration values, and if missing we accept whatever is the highest
+	 * version supported by the library as the max and only limit the range in
+	 * the other end at TLSv1.0. ssl_variant_stream is a ProtocolVariant enum
+	 * for Stream protocols, rather than datagram.
+	 */
+	SSL_VersionRangeGetSupported(ssl_variant_stream, &desired_range);
+	desired_range.min = SSL_LIBRARY_VERSION_TLS_1_0;
+
+	if (conn->ssl_min_protocol_version && strlen(conn->ssl_min_protocol_version) > 0)
+	{
+		int			ssl_min_ver = ssl_protocol_version_to_nss(conn->ssl_min_protocol_version);
+
+		if (ssl_min_ver == -1)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("invalid value \"%s\" for minimum version of SSL protocol\n"),
+							  conn->ssl_min_protocol_version);
+			return -1;
+		}
+
+		desired_range.min = ssl_min_ver;
+	}
+
+	if (conn->ssl_max_protocol_version && strlen(conn->ssl_max_protocol_version) > 0)
+	{
+		int			ssl_max_ver = ssl_protocol_version_to_nss(conn->ssl_max_protocol_version);
+
+		if (ssl_max_ver == -1)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("invalid value \"%s\" for maximum version of SSL protocol\n"),
+							  conn->ssl_max_protocol_version);
+			return -1;
+		}
+
+		desired_range.max = ssl_max_ver;
+	}
+
+	if (SSL_VersionRangeSet(model, &desired_range) != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to set allowed SSL protocol version range: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * Set up callback for verifying server certificates, as well as for how
+	 * to handle failed verifications.
+	 */
+	SSL_AuthCertificateHook(model, pg_cert_auth_handler, (void *) conn);
+	SSL_BadCertHook(model, pg_bad_cert_handler, (void *) conn);
+
+	/*
+	 * Convert the NSPR socket to an SSL socket. Ensuring the success of this
+	 * operation is critical as NSS SSL_* functions may return SECSuccess on
+	 * the socket even though SSL hasn't been enabled, which introduce a risk
+	 * of silent downgrades.
+	 */
+	conn->pr_fd = SSL_ImportFD(model, pr_fd);
+	if (!conn->pr_fd)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to configure client for TLS: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/*
+	 * The model can now we closed as we've applied the settings of the model
+	 * onto the real socket. From hereon we should only use conn->pr_fd.
+	 */
+	PR_Close(model);
+
+	/* Set the private data to be passed to the password callback */
+	SSL_SetPKCS11PinArg(conn->pr_fd, (void *) conn);
+
+	status = SSL_ResetHandshake(conn->pr_fd, PR_FALSE);
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to initiate handshake: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	/* Set callback for client authentication when requested by the server */
+	SSL_GetClientAuthDataHook(conn->pr_fd, pg_client_auth_handler, (void *) conn);
+
+	/*
+	 * Specify which hostname we are expecting to talk to. This is required,
+	 * albeit mostly applies to when opening a connection to a traditional
+	 * http server it seems.
+	 */
+	SSL_SetURL(conn->pr_fd, (conn->connhost[conn->whichhost]).host);
+
+	do
+	{
+		status = SSL_ForceHandshake(conn->pr_fd);
+	}
+	while (status != SECSuccess && PR_GetError() == PR_WOULD_BLOCK_ERROR);
+
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("SSL error: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		return PGRES_POLLING_FAILED;
+	}
+
+	conn->ssl_in_use = true;
+	return PGRES_POLLING_OK;
+}
+
+ssize_t
+pgtls_read(PGconn *conn, void *ptr, size_t len)
+{
+	PRInt32		nread;
+	PRErrorCode status;
+	int			read_errno = 0;
+
+	/*
+	 * PR_Recv blocks until there is data to read or the timeout expires. We
+	 * don't want to sit blocked here, so the timeout is turned off by using
+	 * PR_INTERVAL_NO_WAIT which means "return immediately",  Zero is returned
+	 * for closed connections, while -1 indicates an error within the ongoing
+	 * connection.
+	 */
+	nread = PR_Recv(conn->pr_fd, ptr, len, 0, PR_INTERVAL_NO_WAIT);
+
+	if (nread == 0)
+	{
+		read_errno = ECONNRESET;
+		nread = -1;
+	}
+	else if (nread == -1)
+	{
+		status = PR_GetError();
+
+		switch (status)
+		{
+			case PR_IO_TIMEOUT_ERROR:
+				/* No data available yet. */
+				nread = 0;
+				break;
+
+			case PR_WOULD_BLOCK_ERROR:
+				read_errno = EWOULDBLOCK;
+				break;
+
+				/*
+				 * The error cases for PR_Recv are not documented, but can be
+				 * reverse engineered from _MD_unix_map_default_error() in the
+				 * NSPR code, defined in pr/src/md/unix/unix_errors.c.
+				 */
+			case PR_NETWORK_UNREACHABLE_ERROR:
+			case PR_CONNECT_RESET_ERROR:
+				read_errno = ECONNRESET;
+				break;
+
+			default:
+				break;
+		}
+
+		if (nread == -1)
+		{
+			printfPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("TLS read error: %s"),
+							  pg_SSLerrmessage(status));
+		}
+	}
+
+	SOCK_ERRNO_SET(read_errno);
+	return (ssize_t) nread;
+}
+
+/*
+ * pgtls_read_pending
+ *		Check for the existence of data to be read.
+ *
+ * This is part of the PostgreSQL TLS backend API.
+ */
+bool
+pgtls_read_pending(PGconn *conn)
+{
+	unsigned char c;
+	int			n;
+
+	/*
+	 * PR_Recv peeks into the stream with the timeount turned off, to see if
+	 * there is another byte to read off the wire. There is an NSS function
+	 * SSL_DataPending() which might seem like a better fit, but it will only
+	 * check already encrypted data in the SSL buffer, not still unencrypted
+	 * data, thus it doesn't guarantee that a subsequent call to
+	 * PR_Read/PR_Recv won't block.
+	 */
+	n = PR_Recv(conn->pr_fd, &c, 1, PR_MSG_PEEK, PR_INTERVAL_NO_WAIT);
+	return (n > 0);
+}
+
+ssize_t
+pgtls_write(PGconn *conn, const void *ptr, size_t len)
+{
+	PRInt32		n;
+	PRErrorCode status;
+	int			write_errno = 0;
+
+	n = PR_Write(conn->pr_fd, ptr, len);
+
+	if (n < 0)
+	{
+		status = PR_GetError();
+
+		switch (status)
+		{
+			case PR_WOULD_BLOCK_ERROR:
+#ifdef EAGAIN
+				write_errno = EAGAIN;
+#else
+				write_errno = EINTR;
+#endif
+				break;
+
+			default:
+				printfPQExpBuffer(&conn->errorMessage,
+								  libpq_gettext("TLS write error: %s"),
+								  pg_SSLerrmessage(status));
+				write_errno = ECONNRESET;
+				break;
+		}
+	}
+
+	SOCK_ERRNO_SET(write_errno);
+	return (ssize_t) n;
+}
+
+char *
+pgtls_get_peer_certificate_hash(PGconn *conn, size_t *len)
+{
+	CERTCertificate *server_cert;
+	SECOidTag	signature_tag;
+	SECOidTag	digest_alg;
+	int			digest_len;
+	PLArenaPool *arena;
+	SECItem		digest;
+	char	   *ret;
+	SECStatus	status;
+
+	*len = 0;
+
+	server_cert = SSL_PeerCertificate(conn->pr_fd);
+	if (!server_cert)
+		return NULL;
+
+	signature_tag = SECOID_GetAlgorithmTag(&server_cert->signature);
+	if (!pg_find_signature_algorithm(signature_tag, &digest_alg, &digest_len))
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("could not find digest for OID '%s'\n"),
+						  SECOID_FindOIDTagDescription(signature_tag));
+		return NULL;
+	}
+
+	arena = PORT_NewArena(SEC_ASN1_DEFAULT_ARENA_SIZE);
+	digest.data = PORT_ArenaZAlloc(arena, sizeof(unsigned char) * digest_len);
+	digest.len = digest_len;
+
+	status = PK11_HashBuf(digest_alg, digest.data, server_cert->derCert.data,
+						  server_cert->derCert.len);
+
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to generate peer certificate digest: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		PORT_FreeArena(arena, PR_TRUE);
+		return NULL;
+	}
+
+	ret = pg_malloc(digest.len);
+	memcpy(ret, digest.data, digest.len);
+	*len = digest_len;
+	PORT_FreeArena(arena, PR_TRUE);
+
+	return ret;
+}
+
+/*
+ *	Verify that the server certificate matches the hostname we connected to.
+ *
+ * The certificate's Common Name and Subject Alternative Names are considered.
+ */
+int
+pgtls_verify_peer_name_matches_certificate_guts(PGconn *conn,
+												int *names_examined,
+												char **first_name)
+{
+	char	   *server_hostname = NULL;
+	CERTCertificate *server_cert = NULL;
+	SECStatus	status = SECSuccess;
+	SECItem		altname_item;
+	PLArenaPool *arena = NULL;
+	CERTGeneralName *san_list;
+	CERTGeneralName *cn;
+
+	server_hostname = SSL_RevealURL(conn->pr_fd);
+	if (!server_hostname || server_hostname[0] == '\0')
+		goto done;
+
+	/*
+	 * CERT_VerifyCertName will internally perform RFC 2818 SubjectAltName
+	 * verification.
+	 */
+	server_cert = SSL_PeerCertificate(conn->pr_fd);
+	status = CERT_VerifyCertName(server_cert, server_hostname);
+	if (status != SECSuccess)
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to verify server hostname: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+		goto done;
+	}
+
+	status = CERT_FindCertExtension(server_cert, SEC_OID_X509_SUBJECT_ALT_NAME,
+									&altname_item);
+	if (status == SECSuccess)
+	{
+		arena = PORT_NewArena(DER_DEFAULT_CHUNKSIZE);
+		if (!arena)
+		{
+			status = SECFailure;
+			goto done;
+		}
+		san_list = CERT_DecodeAltNameExtension(arena, &altname_item);
+		if (!san_list)
+		{
+			status = SECFailure;
+			goto done;
+		}
+
+		for (cn = san_list; cn != san_list; cn = CERT_GetNextGeneralName(cn))
+		{
+			char	   *alt_name;
+			int			rv;
+			char		tmp[512];
+
+			status = CERT_RFC1485_EscapeAndQuote(tmp, sizeof(tmp),
+												 (char *) cn->name.other.data,
+												 cn->name.other.len);
+
+			if (status != SECSuccess)
+				goto done;
+
+			rv = pq_verify_peer_name_matches_certificate_name(conn, tmp,
+															  strlen(tmp),
+															  &alt_name);
+			if (alt_name)
+			{
+				if (!*first_name)
+					*first_name = alt_name;
+				else
+					free(alt_name);
+			}
+
+			if (rv == 1)
+				status = SECSuccess;
+			else
+			{
+				status = SECFailure;
+				break;
+			}
+		}
+	}
+	else if (PORT_GetError() == SEC_ERROR_EXTENSION_NOT_FOUND)
+		status = SECSuccess;
+	else
+		status = SECSuccess;
+
+done:
+	/* san_list will be freed by freeing the arena it was allocated in */
+	if (arena)
+		PORT_FreeArena(arena, PR_TRUE);
+	PR_Free(server_hostname);
+
+	if (status == SECSuccess)
+		return 1;
+
+	return 0;
+}
+
+/* ------------------------------------------------------------ */
+/*			PostgreSQL specific TLS support functions			*/
+/* ------------------------------------------------------------ */
+
+static const char *
+pg_SSLerrmessage(PRErrorCode errcode)
+{
+	const char *error;
+
+	/*
+	 * Try to get the user friendly error description, and if that fails try
+	 * to fall back on the name of the PRErrorCode.
+	 */
+	error = PR_ErrorToString(errcode, PR_LANGUAGE_I_DEFAULT);
+	if (!error)
+		error = PR_ErrorToName(errcode);
+	if (error)
+		return error;
+
+	return "unknown TLS error";
+}
+
+static SECStatus
+pg_load_nss_module(SECMODModule **module, const char *library, const char *name)
+{
+	SECMODModule *mod;
+	char	   *modulespec;
+
+	modulespec = psprintf("library=\"%s\", name=\"%s\"", library, name);
+
+	/*
+	 * Attempt to load the specified module. The second parameter is "parent"
+	 * which should always be NULL for application code. The third parameter
+	 * defines if loading should recurse which is only applicable when loading
+	 * a module from within another module. This hierarchy would have to be
+	 * defined in the modulespec, and since we don't support anything but
+	 * directly addressed modules we should pass PR_FALSE.
+	 */
+	mod = SECMOD_LoadUserModule(modulespec, NULL, PR_FALSE);
+	pfree(modulespec);
+
+	if (mod && mod->loaded)
+	{
+		*module = mod;
+		return SECSuccess;
+	}
+
+	SECMOD_DestroyModule(mod);
+	return SECFailure;
+}
+
+/* ------------------------------------------------------------ */
+/*						NSS Callbacks							*/
+/* ------------------------------------------------------------ */
+
+/*
+ * pg_cert_auth_handler
+ *			Callback for authenticating server certificate
+ *
+ * This is pretty much the same procedure as the SSL_AuthCertificate function
+ * provided by NSS, with the difference being server hostname validation. With
+ * SSL_AuthCertificate there is no way to do verify-ca, it only does the -full
+ * flavor of our sslmodes, so we need our own implementation.
+ */
+static SECStatus
+pg_cert_auth_handler(void *arg, PRFileDesc *fd, PRBool checksig, PRBool isServer)
+{
+	SECStatus	status;
+	PGconn	   *conn = (PGconn *) arg;
+	CERTCertificate *server_cert;
+	void	   *pin;
+
+	Assert(!isServer);
+
+	pin = SSL_RevealPinArg(conn->pr_fd);
+	server_cert = SSL_PeerCertificate(conn->pr_fd);
+
+	/*
+	 * VerifyCertificateNow verifies the validity using PR_now from NSPR as a
+	 * timestamp and will perform CRL and OSCP revocation checks. conn->sslcrl
+	 * does not impact NSS connections as any CRL in the NSS database will be
+	 * used automatically.
+	 */
+	status = CERT_VerifyCertificateNow((CERTCertDBHandle *) CERT_GetDefaultCertDB(),
+									   server_cert,
+									   checksig,
+									   certificateUsageSSLServer,
+									   pin,
+									   NULL);
+
+	/*
+	 * If we've already failed validation then there is no point in also
+	 * performing the hostname check for verify-full.
+	 */
+	if (status == SECSuccess)
+	{
+		if (!pq_verify_peer_name_matches_certificate(conn))
+			status = SECFailure;
+	}
+	else
+	{
+		printfPQExpBuffer(&conn->errorMessage,
+						  libpq_gettext("unable to verify certificate: %s"),
+						  pg_SSLerrmessage(PR_GetError()));
+	}
+
+	return status;
+}
+
+/*
+ * pg_client_auth_handler
+ *		Callback for client certificate validation
+ *
+ * The client auth callback is not on by default in NSS, so we need to invoke
+ * it ourselves to ensure we can do cert authentication. A TODO is to support
+ * running without a specified sslcert parameter. By retrieving all the certs
+ * via nickname from the cert database and see if we find one which apply with
+ * NSS_CmpCertChainWCANames() and PK11_FindKeyByAnyCert() we could support
+ * just running with a ssl database specified.
+ *
+ * For now, we use the default client certificate validation which requires a
+ * defined nickname to identify the cert in the database.
+ */
+static SECStatus
+pg_client_auth_handler(void *arg, PRFileDesc *socket, CERTDistNames *caNames,
+					   CERTCertificate **pRetCert, SECKEYPrivateKey **pRetKey)
+{
+	PGconn	   *conn = (PGconn *) arg;
+
+	return NSS_GetClientAuthData(conn->sslcert, socket, caNames, pRetCert, pRetKey);
+}
+
+/*
+ * pg_bad_cert_handler
+ *		Callback for failed certificate validation
+ *
+ * The TLS handshake will call this function iff the server certificate failed
+ * validation. Depending on the sslmode, we allow the connection anyways.
+ */
+static SECStatus
+pg_bad_cert_handler(void *arg, PRFileDesc *fd)
+{
+	PGconn	   *conn = (PGconn *) arg;
+	PRErrorCode err;
+
+	/*
+	 * This really shouldn't happen, as we've set the PGconn object as our
+	 * callback data, and at the callsite we know it will be populated. That
+	 * being said, the NSS code itself performs this check even when it should
+	 * not be required so let's use the same belts with our suspenders.
+	 */
+	if (!arg)
+		return SECFailure;
+
+	/*
+	 * For sslmodes other than verify-full and verify-ca we don't perform peer
+	 * validation, so return immediately.  sslmode require with a database
+	 * specified which contains a CA certificate will work like verify-ca to
+	 * be compatible with the OpenSSL implementation.
+	 */
+	if (strcmp(conn->sslmode, "require") == 0)
+	{
+		if (conn->cert_database &&
+			strlen(conn->cert_database) > 0 &&
+			cert_database_has_CA(conn))
+			return SECFailure;
+	}
+	if (conn->sslmode[0] == 'v')
+		return SECFailure;
+
+	err = PORT_GetError();
+
+	/*
+	 * TODO: these are relevant error codes that can occur in certificate
+	 * validation, figure out which we don't want for require/prefer etc.
+	 */
+	switch (err)
+	{
+		case SEC_ERROR_INVALID_AVA:
+		case SEC_ERROR_INVALID_TIME:
+		case SEC_ERROR_BAD_SIGNATURE:
+		case SEC_ERROR_EXPIRED_CERTIFICATE:
+		case SEC_ERROR_UNKNOWN_ISSUER:
+		case SEC_ERROR_UNTRUSTED_ISSUER:
+		case SEC_ERROR_UNTRUSTED_CERT:
+		case SEC_ERROR_CERT_VALID:
+		case SEC_ERROR_EXPIRED_ISSUER_CERTIFICATE:
+		case SEC_ERROR_CRL_EXPIRED:
+		case SEC_ERROR_CRL_BAD_SIGNATURE:
+		case SEC_ERROR_EXTENSION_VALUE_INVALID:
+		case SEC_ERROR_CA_CERT_INVALID:
+		case SEC_ERROR_CERT_USAGES_INVALID:
+		case SEC_ERROR_UNKNOWN_CRITICAL_EXTENSION:
+			return SECSuccess;
+			break;
+		default:
+			return SECFailure;
+			break;
+	}
+
+	/* Unreachable */
+	return SECSuccess;
+}
+
+/* ------------------------------------------------------------ */
+/*					SSL information functions					*/
+/* ------------------------------------------------------------ */
+
+/*
+ * PQgetssl
+ *
+ * Return NULL as this is legacy and defined to always be equal to calling
+ * PQsslStruct(conn, "OpenSSL"); This should ideally trigger a logged warning
+ * somewhere as it's nonsensical to run in a non-OpenSSL build.
+ */
+void *
+PQgetssl(PGconn *conn)
+{
+	return NULL;
+}
+
+void *
+PQsslStruct(PGconn *conn, const char *struct_name)
+{
+	if (!conn)
+		return NULL;
+
+	/*
+	 * Return the underlying PRFileDesc which can be used to access
+	 * information on the connection details. There is no SSL context per se.
+	 */
+	if (strcmp(struct_name, "NSS") == 0)
+		return conn->pr_fd;
+	return NULL;
+}
+
+const char *const *
+PQsslAttributeNames(PGconn *conn)
+{
+	static const char *const result[] = {
+		"library",
+		"cipher",
+		"protocol",
+		"key_bits",
+		"compression",
+		NULL
+	};
+
+	return result;
+}
+
+const char *
+PQsslAttribute(PGconn *conn, const char *attribute_name)
+{
+	SECStatus	status;
+	SSLChannelInfo channel;
+	SSLCipherSuiteInfo suite;
+
+	if (!conn || !conn->pr_fd)
+		return NULL;
+
+	if (strcmp(attribute_name, "library") == 0)
+		return "NSS";
+
+	status = SSL_GetChannelInfo(conn->pr_fd, &channel, sizeof(channel));
+	if (status != SECSuccess)
+		return NULL;
+
+	status = SSL_GetCipherSuiteInfo(channel.cipherSuite, &suite, sizeof(suite));
+	if (status != SECSuccess)
+		return NULL;
+
+	if (strcmp(attribute_name, "cipher") == 0)
+		return suite.cipherSuiteName;
+
+	if (strcmp(attribute_name, "key_bits") == 0)
+	{
+		static char key_bits_str[8];
+
+		snprintf(key_bits_str, sizeof(key_bits_str), "%i", suite.effectiveKeyBits);
+		return key_bits_str;
+	}
+
+	if (strcmp(attribute_name, "protocol") == 0)
+	{
+		switch (channel.protocolVersion)
+		{
+#ifdef SSL_LIBRARY_VERSION_TLS_1_3
+			case SSL_LIBRARY_VERSION_TLS_1_3:
+				return "TLSv1.3";
+#endif
+#ifdef SSL_LIBRARY_VERSION_TLS_1_2
+			case SSL_LIBRARY_VERSION_TLS_1_2:
+				return "TLSv1.2";
+#endif
+#ifdef SSL_LIBRARY_VERSION_TLS_1_1
+			case SSL_LIBRARY_VERSION_TLS_1_1:
+				return "TLSv1.1";
+#endif
+			case SSL_LIBRARY_VERSION_TLS_1_0:
+				return "TLSv1.0";
+			default:
+				return "unknown";
+		}
+	}
+
+	/*
+	 * NSS disabled support for compression in version 3.33, and it was only
+	 * available for SSLv3 at that point anyways, so we can safely return off
+	 * here without checking.
+	 */
+	if (strcmp(attribute_name, "compression") == 0)
+		return "off";
+
+	return NULL;
+}
+
+static int
+ssl_protocol_version_to_nss(const char *protocol)
+{
+	if (pg_strcasecmp("TLSv1", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_0;
+
+#ifdef SSL_LIBRARY_VERSION_TLS_1_1
+	if (pg_strcasecmp("TLSv1.1", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_1;
+#endif
+
+#ifdef SSL_LIBRARY_VERSION_TLS_1_2
+	if (pg_strcasecmp("TLSv1.2", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_2;
+#endif
+
+#ifdef SSL_LIBRARY_VERSION_TLS_1_3
+	if (pg_strcasecmp("TLSv1.3", protocol) == 0)
+		return SSL_LIBRARY_VERSION_TLS_1_3;
+#endif
+
+	return -1;
+}
+
+/*
+ * cert_database_has_CA
+ *		 Check for the presence of a CA certificate
+ *
+ * Returns true in case there is a CA certificate in the database connected
+ * to in the conn object, else false. This function only checks for the
+ * presence of a CA certificate, not it's validity and/or usefulness.
+ */
+static bool
+cert_database_has_CA(PGconn *conn)
+{
+	CERTCertList *certificates;
+	bool		hasCA;
+
+	/*
+	 * If the certificate database has a password we must provide it, since
+	 * this API doesn't invoke the standard password callback.
+	 */
+	if (conn->has_password)
+		certificates = PK11_ListCerts(PK11CertListCA, PQssl_passwd_cb(NULL, PR_FALSE, (void *) conn));
+	else
+		certificates = PK11_ListCerts(PK11CertListCA, NULL);
+	hasCA = !CERT_LIST_EMPTY(certificates);
+	CERT_DestroyCertList(certificates);
+
+	return hasCA;
+}
+
+PQsslKeyPassHook_nss_type
+PQgetSSLKeyPassHook_nss(void)
+{
+	return PQsslKeyPassHook;
+}
+
+void
+PQsetSSLKeyPassHook_nss(PQsslKeyPassHook_nss_type hook)
+{
+	PQsslKeyPassHook = hook;
+}
+
+/*
+ * PQssl_passwd_cb
+ *		 Supply a password to decrypt an object
+ *
+ * If an object in the NSS database is password protected, or if the entire
+ * NSS database is itself password protected, this callback will be invoked.
+ *
+ * This must match NSS type PK11PasswordFunc.
+ */
+static char *
+PQssl_passwd_cb(PK11SlotInfo *slot, PRBool retry, void *arg)
+{
+	PGconn	   *conn = (PGconn *) arg;
+
+	conn->has_password = true;
+
+	if (PQsslKeyPassHook)
+		return PQsslKeyPassHook(slot, (PRBool) retry, arg);
+	else
+		return PQdefaultSSLKeyPassHook_nss(slot, retry, arg);
+}
+
+/*
+ * PQdefaultSSLKeyPassHook_nss
+ * 		 Default password handler callback
+ *
+ * If no user defined password callback has been set up, the callback below
+ * will try the password set by the sslpassword parameter. Since we by legacy
+ * only have support for a single password, there is little reason to inspect
+ * the slot for the object in question. A TODO is to support different
+ * passwords for different objects, either via a DSL in sslpassword or with a
+ * new key/value style parameter. Users can supply their own password hook to
+ * do this of course, but it would be nice to support something in core too.
+ */
+char *
+PQdefaultSSLKeyPassHook_nss(PK11SlotInfo *slot, PRBool retry, void *arg)
+{
+	PGconn	   *conn = (PGconn *) arg;
+
+	/*
+	 * If the password didn't work the first time there is no point in
+	 * retrying as it hasn't changed.
+	 */
+	if (retry != PR_TRUE && conn->sslpassword && strlen(conn->sslpassword) > 0)
+		return PORT_Strdup(conn->sslpassword);
+
+	return NULL;
+}
diff --git a/src/interfaces/libpq/fe-secure.c b/src/interfaces/libpq/fe-secure.c
index c601071838..7f10da3010 100644
--- a/src/interfaces/libpq/fe-secure.c
+++ b/src/interfaces/libpq/fe-secure.c
@@ -448,6 +448,27 @@ PQdefaultSSLKeyPassHook_OpenSSL(char *buf, int size, PGconn *conn)
 }
 #endif							/* USE_OPENSSL */
 
+#ifndef USE_NSS
+
+PQsslKeyPassHook_nss_type
+PQgetSSLKeyPassHook_nss(void)
+{
+	return NULL;
+}
+
+void
+PQsetSSLKeyPassHook_nss(PQsslKeyPassHook_nss_type hook)
+{
+	return;
+}
+
+char *
+PQdefaultSSLKeyPassHook_nss(PK11SlotInfo * slot, PRBool retry, void *arg)
+{
+	return NULL;
+}
+#endif							/* USE_NSS */
+
 /* Dummy version of GSSAPI information functions, when built without GSS support */
 #ifndef ENABLE_GSS
 
diff --git a/src/interfaces/libpq/libpq-fe.h b/src/interfaces/libpq/libpq-fe.h
index 47a098b4b9..d9aa65d887 100644
--- a/src/interfaces/libpq/libpq-fe.h
+++ b/src/interfaces/libpq/libpq-fe.h
@@ -624,6 +624,17 @@ extern PQsslKeyPassHook_OpenSSL_type PQgetSSLKeyPassHook_OpenSSL(void);
 extern void PQsetSSLKeyPassHook_OpenSSL(PQsslKeyPassHook_OpenSSL_type hook);
 extern int	PQdefaultSSLKeyPassHook_OpenSSL(char *buf, int size, PGconn *conn);
 
+/* == in fe-secure-nss.c === */
+typedef struct PK11SlotInfoStr PK11SlotInfo;
+typedef int PRIntn;
+typedef PRIntn PRBool;
+
+/* Support for overriding sslpassword handling with a callback */
+typedef char *(*PQsslKeyPassHook_nss_type) (PK11SlotInfo *slot, PRBool retry, void *arg);
+extern PQsslKeyPassHook_nss_type PQgetSSLKeyPassHook_nss(void);
+extern void PQsetSSLKeyPassHook_nss(PQsslKeyPassHook_nss_type hook);
+extern char *PQdefaultSSLKeyPassHook_nss(PK11SlotInfo *slot, PRBool retry, void *arg);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/src/interfaces/libpq/libpq-int.h b/src/interfaces/libpq/libpq-int.h
index 0c9e95f1a7..f15af39222 100644
--- a/src/interfaces/libpq/libpq-int.h
+++ b/src/interfaces/libpq/libpq-int.h
@@ -383,6 +383,7 @@ struct pg_conn
 	char	   *sslrootcert;	/* root certificate filename */
 	char	   *sslcrl;			/* certificate revocation list filename */
 	char	   *sslcrldir;		/* certificate revocation list directory name */
+	char	   *cert_database;	/* NSS certificate/key database */
 	char	   *requirepeer;	/* required peer credentials for local sockets */
 	char	   *gssencmode;		/* GSS mode (require,prefer,disable) */
 	char	   *krbsrvname;		/* Kerberos service name */
@@ -507,6 +508,28 @@ struct pg_conn
 								 * OpenSSL version changes */
 #endif
 #endif							/* USE_OPENSSL */
+
+/*
+ * The NSS/NSPR specific types aren't used to avoid pulling in the required
+ * headers here, as they are causing conflicts with PG definitions.
+ */
+#ifdef USE_NSS
+	void	   *nss_context;	/* NSS connection specific context */
+	void	   *pr_fd;			/* NSPR file descriptor for the connection */
+
+	/*
+	 * Track whether the NSS database has a password set or not. There is no
+	 * API function for retrieving password status of a database, but we need
+	 * to know since some NSS API calls require the password passed in (they
+	 * don't call the callback themselves). To track, we simply flip this to
+	 * true in case NSS invoked the password callback - as that will only
+	 * happen in case there is a password. The reason for tracking this is
+	 * that there are calls which require a password parameter, but doesn't
+	 * use the callbacks provided, so we must call the callback on behalf of
+	 * these.
+	 */
+	bool		has_password;
+#endif							/* USE_NSS */
 #endif							/* USE_SSL */
 
 #ifdef ENABLE_GSS
@@ -781,7 +804,7 @@ extern ssize_t pgtls_write(PGconn *conn, const void *ptr, size_t len);
  * This is not supported with old versions of OpenSSL that don't have
  * the X509_get_signature_nid() function.
  */
-#if defined(USE_OPENSSL) && defined(HAVE_X509_GET_SIGNATURE_NID)
+#if defined(USE_NSS) || (defined(USE_OPENSSL) && defined(HAVE_X509_GET_SIGNATURE_NID))
 #define HAVE_PGTLS_GET_PEER_CERTIFICATE_HASH
 extern char *pgtls_get_peer_certificate_hash(PGconn *conn, size_t *len);
 #endif
-- 
2.21.1 (Apple Git-122.3)

From 4fae9756dfcfe37d86ca01d3c3879dd76b6f314f Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Mon, 8 Feb 2021 23:52:34 +0100
Subject: [PATCH v30 2/9] Refactor SSL testharness for multiple library

The SSL testharness was fully tied to OpenSSL in the way the server was
set up and reconfigured. This refactors the SSLServer module into a SSL
library agnostic SSL/Server module which in turn use SSL/Backend/<lib>
modules for the implementation details.

No changes are done to the actual tests, this only change how setup and
teardown is performed.
---
 src/test/ssl/t/001_ssltests.pl                |  56 ++--------
 src/test/ssl/t/002_scram.pl                   |   6 +-
 src/test/ssl/t/SSL/Backend/OpenSSL.pm         | 103 ++++++++++++++++++
 .../ssl/t/{SSLServer.pm => SSL/Server.pm}     |  83 +++++++++++---
 4 files changed, 181 insertions(+), 67 deletions(-)
 create mode 100644 src/test/ssl/t/SSL/Backend/OpenSSL.pm
 rename src/test/ssl/t/{SSLServer.pm => SSL/Server.pm} (78%)

diff --git a/src/test/ssl/t/001_ssltests.pl b/src/test/ssl/t/001_ssltests.pl
index 864f6e209f..30b68bddbe 100644
--- a/src/test/ssl/t/001_ssltests.pl
+++ b/src/test/ssl/t/001_ssltests.pl
@@ -4,12 +4,10 @@ use PostgresNode;
 use TestLib;
 use Test::More;
 
-use File::Copy;
-
 use FindBin;
 use lib $FindBin::RealBin;
 
-use SSLServer;
+use SSL::Server;
 
 if ($ENV{with_ssl} ne 'openssl')
 {
@@ -32,32 +30,6 @@ my $SERVERHOSTCIDR = '127.0.0.1/32';
 # Allocation of base connection string shared among multiple tests.
 my $common_connstr;
 
-# The client's private key must not be world-readable, so take a copy
-# of the key stored in the code tree and update its permissions.
-#
-# This changes ssl/client.key to ssl/client_tmp.key etc for the rest
-# of the tests.
-my @keys = (
-	"client",     "client-revoked",
-	"client-der", "client-encrypted-pem",
-	"client-encrypted-der");
-foreach my $key (@keys)
-{
-	copy("ssl/${key}.key", "ssl/${key}_tmp.key")
-	  or die
-	  "couldn't copy ssl/${key}.key to ssl/${key}_tmp.key for permissions change: $!";
-	chmod 0600, "ssl/${key}_tmp.key"
-	  or die "failed to change permissions on ssl/${key}_tmp.key: $!";
-}
-
-# Also make a copy of that explicitly world-readable.  We can't
-# necessarily rely on the file in the source tree having those
-# permissions.  Add it to @keys to include it in the final clean
-# up phase.
-copy("ssl/client.key", "ssl/client_wrongperms_tmp.key");
-chmod 0644, "ssl/client_wrongperms_tmp.key";
-push @keys, 'client_wrongperms';
-
 #### Set up the server.
 
 note "setting up data directory";
@@ -72,32 +44,22 @@ $node->start;
 
 # Run this before we lock down access below.
 my $result = $node->safe_psql('postgres', "SHOW ssl_library");
-is($result, 'OpenSSL', 'ssl_library parameter');
+is($result, SSL::Server::ssl_library(), 'ssl_library parameter');
 
 configure_test_server_for_ssl($node, $SERVERHOSTADDR, $SERVERHOSTCIDR,
 	'trust');
 
 note "testing password-protected keys";
 
-open my $sslconf, '>', $node->data_dir . "/sslconfig.conf";
-print $sslconf "ssl=on\n";
-print $sslconf "ssl_cert_file='server-cn-only.crt'\n";
-print $sslconf "ssl_key_file='server-password.key'\n";
-print $sslconf "ssl_passphrase_command='echo wrongpassword'\n";
-close $sslconf;
-
+set_server_cert($node, 'server-cn-only', 'root+client_ca',
+				   'server-password', 'echo wrongpassword');
 command_fails(
 	[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
 	'restart fails with password-protected key file with wrong password');
 $node->_update_pid(0);
 
-open $sslconf, '>', $node->data_dir . "/sslconfig.conf";
-print $sslconf "ssl=on\n";
-print $sslconf "ssl_cert_file='server-cn-only.crt'\n";
-print $sslconf "ssl_key_file='server-password.key'\n";
-print $sslconf "ssl_passphrase_command='echo secret1'\n";
-close $sslconf;
-
+set_server_cert($node, 'server-cn-only', 'root+client_ca',
+				'server-password', 'echo secret1');
 command_ok(
 	[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
 	'restart succeeds with password-protected key file');
@@ -574,7 +536,5 @@ test_connect_fails(
 	"certificate authorization fails with revoked client cert with server-side CRL directory");
 
 # clean up
-foreach my $key (@keys)
-{
-	unlink("ssl/${key}_tmp.key");
-}
+
+SSL::Server::cleanup();
diff --git a/src/test/ssl/t/002_scram.pl b/src/test/ssl/t/002_scram.pl
index 410b9e910d..3383b3e531 100644
--- a/src/test/ssl/t/002_scram.pl
+++ b/src/test/ssl/t/002_scram.pl
@@ -11,11 +11,11 @@ use File::Copy;
 use FindBin;
 use lib $FindBin::RealBin;
 
-use SSLServer;
+use SSL::Server;
 
 if ($ENV{with_ssl} ne 'openssl')
 {
-	plan skip_all => 'OpenSSL not supported by this build';
+	plan skip_all => 'SSL not supported by this build';
 }
 
 # This is the hostname used to connect to the server.
@@ -104,5 +104,3 @@ test_connect_fails(
 
 # clean up
 unlink($client_tmp_key);
-
-done_testing($number_of_tests);
diff --git a/src/test/ssl/t/SSL/Backend/OpenSSL.pm b/src/test/ssl/t/SSL/Backend/OpenSSL.pm
new file mode 100644
index 0000000000..62b11b7632
--- /dev/null
+++ b/src/test/ssl/t/SSL/Backend/OpenSSL.pm
@@ -0,0 +1,103 @@
+package SSL::Backend::OpenSSL;
+
+use strict;
+use warnings;
+use Exporter;
+use File::Copy;
+
+our @ISA       = qw(Exporter);
+our @EXPORT_OK = qw(get_new_openssl_backend);
+
+our (@keys);
+
+INIT
+{
+	@keys = (
+		"client",     "client-revoked",
+		"client-der", "client-encrypted-pem",
+		"client-encrypted-der");
+}
+
+sub new
+{
+	my ($class) = @_;
+
+	my $self = { _library => 'OpenSSL' };
+
+	bless $self, $class;
+
+	return $self;
+}
+
+sub get_new_openssl_backend
+{
+	my $class = 'SSL::Backend::OpenSSL';
+
+	my $backend = $class->new();
+
+	return $backend;
+}
+
+sub init
+{
+	# The client's private key must not be world-readable, so take a copy
+	# of the key stored in the code tree and update its permissions.
+	#
+	# This changes ssl/client.key to ssl/client_tmp.key etc for the rest
+	# of the tests.
+	foreach my $key (@keys)
+	{
+		copy("ssl/${key}.key", "ssl/${key}_tmp.key")
+		  or die
+		  "couldn't copy ssl/${key}.key to ssl/${key}_tmp.key for permissions change: $!";
+		chmod 0600, "ssl/${key}_tmp.key"
+		  or die "failed to change permissions on ssl/${key}_tmp.key: $!";
+	}
+
+	# Also make a copy of that explicitly world-readable.  We can't
+	# necessarily rely on the file in the source tree having those
+	# permissions. Add it to @keys to include it in the final clean
+	# up phase.
+	copy("ssl/client.key", "ssl/client_wrongperms_tmp.key")
+	  or die
+	  "couldn't copy ssl/client.key to ssl/client_wrongperms_tmp.key: $!";
+	chmod 0644, "ssl/client_wrongperms_tmp.key"
+	  or die
+	  "failed to change permissions on ssl/client_wrongperms_tmp.key: $!";
+	push @keys, 'client_wrongperms';
+}
+
+# Change the configuration to use given server cert file, and reload
+# the server so that the configuration takes effect.
+sub set_server_cert
+{
+	my $self     = $_[0];
+	my $certfile = $_[1];
+	my $cafile   = $_[2] || "root+client_ca";
+	my $keyfile  = $_[3] || $certfile;
+
+	my $sslconf =
+	    "ssl_ca_file='$cafile.crt'\n"
+	  . "ssl_cert_file='$certfile.crt'\n"
+	  . "ssl_key_file='$keyfile.key'\n"
+	  . "ssl_crl_file='root+client.crl'\n";
+
+	return $sslconf;
+}
+
+sub get_library
+{
+	my ($self) = @_;
+
+	return $self->{_library};
+}
+
+sub cleanup
+{
+	foreach my $key (@keys)
+	{
+		unlink("ssl/${key}_tmp.key");
+	}
+}
+
+1;
diff --git a/src/test/ssl/t/SSLServer.pm b/src/test/ssl/t/SSL/Server.pm
similarity index 78%
rename from src/test/ssl/t/SSLServer.pm
rename to src/test/ssl/t/SSL/Server.pm
index 5ec5e0dac8..e59554f85b 100644
--- a/src/test/ssl/t/SSLServer.pm
+++ b/src/test/ssl/t/SSL/Server.pm
@@ -23,19 +23,39 @@
 # explicitly because an invalid sslcert or sslrootcert, respectively,
 # causes those to be ignored.)
 
-package SSLServer;
+package SSL::Server;
 
 use strict;
 use warnings;
 use PostgresNode;
+use RecursiveCopy;
 use TestLib;
 use File::Basename;
 use File::Copy;
 use Test::More;
+use SSL::Backend::OpenSSL qw(get_new_openssl_backend);
+use SSL::Backend::NSS qw(get_new_nss_backend);
+
+our ($openssl, $nss, $backend);
+
+# The TLS backend which the server is using should be mostly transparent for
+# the user, apart from individual configuration settings, so keep the backend
+# specific things abstracted behind SSL::Server.
+if ($ENV{with_ssl} eq 'openssl')
+{
+	$backend = get_new_openssl_backend();
+	$openssl = 1;
+}
+elsif ($ENV{with_ssl} eq 'nss')
+{
+	$backend = get_new_nss_backend();
+	$nss     = 1;
+}
 
 use Exporter 'import';
 our @EXPORT = qw(
   configure_test_server_for_ssl
+  set_server_cert
   switch_server_cert
   test_connect_fails
   test_connect_ok
@@ -144,14 +164,21 @@ sub configure_test_server_for_ssl
 	close $sslconf;
 
 	# Copy all server certificates and keys, and client root cert, to the data dir
-	copy_files("ssl/server-*.crt", $pgdata);
-	copy_files("ssl/server-*.key", $pgdata);
-	chmod(0600, glob "$pgdata/server-*.key") or die $!;
-	copy_files("ssl/root+client_ca.crt", $pgdata);
-	copy_files("ssl/root_ca.crt",        $pgdata);
-	copy_files("ssl/root+client.crl",    $pgdata);
-	mkdir("$pgdata/root+client-crldir");
-	copy_files("ssl/root+client-crldir/*", "$pgdata/root+client-crldir/");
+	if (defined($openssl))
+	{
+		copy_files("ssl/server-*.crt", $pgdata);
+		copy_files("ssl/server-*.key", $pgdata);
+		chmod(0600, glob "$pgdata/server-*.key") or die $!;
+		copy_files("ssl/root+client_ca.crt", $pgdata);
+		copy_files("ssl/root_ca.crt",        $pgdata);
+		copy_files("ssl/root+client.crl",    $pgdata);
+		mkdir("$pgdata/root+client-crldir");
+		copy_files("ssl/root+client-crldir/*", "$pgdata/root+client-crldir/");
+	}
+	elsif (defined($nss))
+	{
+		RecursiveCopy::copypath("ssl/nss", $pgdata . "/nss") if -e "ssl/nss";
+	}
 
 	# Stop and restart server to load new listen_addresses.
 	$node->restart;
@@ -159,20 +186,36 @@ sub configure_test_server_for_ssl
 	# Change pg_hba after restart because hostssl requires ssl=on
 	configure_hba_for_ssl($node, $servercidr, $authmethod);
 
+	# Finally, perform backend specific configuration
+	$backend->init();
+
 	return;
 }
 
-# Change the configuration to use given server cert file, and reload
-# the server so that the configuration takes effect.
-sub switch_server_cert
+sub ssl_library
+{
+	return $backend->get_library();
+}
+
+sub cleanup
+{
+	$backend->cleanup();
+}
+
+# Change the configuration to use given server cert file,
+sub set_server_cert
 {
 	my $node     = $_[0];
 	my $certfile = $_[1];
 	my $cafile   = $_[2] || "root+client_ca";
+	my $keyfile  = $_[3] || '';
+	my $pwcmd    = $_[4] || '';
 	my $crlfile  = "root+client.crl";
 	my $crldir;
 	my $pgdata   = $node->data_dir;
 
+	$keyfile = $certfile if $keyfile eq '';
+
 	# defaults to use crl file
 	if (defined $_[3] || defined $_[4])
 	{
@@ -182,13 +225,23 @@ sub switch_server_cert
 
 	open my $sslconf, '>', "$pgdata/sslconfig.conf";
 	print $sslconf "ssl=on\n";
-	print $sslconf "ssl_ca_file='$cafile.crt'\n";
-	print $sslconf "ssl_cert_file='$certfile.crt'\n";
-	print $sslconf "ssl_key_file='$certfile.key'\n";
+	print $sslconf $backend->set_server_cert($certfile, $cafile, $keyfile);
 	print $sslconf "ssl_crl_file='$crlfile'\n" if defined $crlfile;
 	print $sslconf "ssl_crl_dir='$crldir'\n" if defined $crldir;
+	print $sslconf "ssl_passphrase_command='$pwcmd'\n"
+	  unless $pwcmd eq '';
 	close $sslconf;
+	return;
+}
 
+# Change the configuration to use given server cert file, and reload
+# the server so that the configuration takes effect.
+# Takes the same arguments as set_server_cert, which it calls to do that
+# piece of the work.
+sub switch_server_cert
+{
+	my $node = $_[0];
+	set_server_cert(@_);
 	$node->restart;
 	return;
 }
-- 
2.21.1 (Apple Git-122.3)

From 3f808ad0fa6c3022a473c14ff3e273223b1c799d Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Mon, 8 Feb 2021 23:52:37 +0100
Subject: [PATCH v30 3/9] nss: Add NSS specific tests

This adds the SSL/Backend/NSS which implements the setup and teardown
required as well as adds the NSS configuration to the existing tests.

The OpenSSL testfiles are reused by repackaging them into NSS databases
in order for the tests to be cross-library. Additional testfiles are
generated by using only the NSS toolchain as well as rudimentary tests
using these.
---
 src/test/ssl/Makefile                 | 244 ++++++++++++++++++
 src/test/ssl/t/001_ssltests.pl        | 342 +++++++++++++++++---------
 src/test/ssl/t/002_scram.pl           |  31 ++-
 src/test/ssl/t/SSL/Backend/NSS.pm     |  61 +++++
 src/test/ssl/t/SSL/Backend/OpenSSL.pm |  19 +-
 src/test/ssl/t/SSL/Server.pm          |  48 +---
 6 files changed, 582 insertions(+), 163 deletions(-)
 create mode 100644 src/test/ssl/t/SSL/Backend/NSS.pm

diff --git a/src/test/ssl/Makefile b/src/test/ssl/Makefile
index 4b53fdf6c0..8d4afa9dd0 100644
--- a/src/test/ssl/Makefile
+++ b/src/test/ssl/Makefile
@@ -33,6 +33,36 @@ SSLFILES := $(CERTIFICATES:%=ssl/%.key) $(CERTIFICATES:%=ssl/%.crt) \
 SSLDIRS := ssl/client-crldir ssl/server-crldir \
 	ssl/root+client-crldir ssl/root+server-crldir
 
+# Even though we in practice could get away with far fewer NSS databases, they
+# are generated to mimic the setup for the OpenSSL tests in order to ensure
+# we isolate the same behavior between the backends. The database name should
+# contain the files included for easier test suite code reading.
+NSSFILES := ssl/nss/client_ca.crt.db \
+	ssl/nss/server_ca.crt.db \
+	ssl/nss/root+server_ca.crt.db \
+	ssl/nss/root+client_ca.crt.db \
+	ssl/nss/client.crt__client.key.db \
+	ssl/nss/client-revoked.crt__client-revoked.key.db \
+	ssl/nss/server-cn-only.crt__server-password.key.db \
+	ssl/nss/server-cn-only.crt__server-cn-only.key.db \
+	ssl/nss/root.crl \
+	ssl/nss/server.crl \
+	ssl/nss/client.crl \
+	ssl/nss/server-multiple-alt-names.crt__server-multiple-alt-names.key.db \
+	ssl/nss/server-single-alt-name.crt__server-single-alt-name.key.db \
+	ssl/nss/server-cn-and-alt-names.crt__server-cn-and-alt-names.key.db \
+	ssl/nss/server-no-names.crt__server-no-names.key.db \
+	ssl/nss/server-revoked.crt__server-revoked.key.db \
+	ssl/nss/root+client.crl \
+	ssl/nss/client+client_ca.crt__client.key.db \
+	ssl/nss/client.crt__client-encrypted-pem.key.db \
+	ssl/nss/root+server_ca.crt__server.crl.db \
+	ssl/nss/root+server_ca.crt__root+server.crl.db \
+	ssl/nss/root+server_ca.crt__root+server.crldir.db \
+	ssl/nss/native_ca-root.db \
+	ssl/nss/native_server-root.db \
+	ssl/nss/native_client-root.db
+
 # This target re-generates all the key and certificate files. Usually we just
 # use the ones that are committed to the tree without rebuilding them.
 #
@@ -40,6 +70,10 @@ SSLDIRS := ssl/client-crldir ssl/server-crldir \
 #
 sslfiles: $(SSLFILES) $(SSLDIRS)
 
+# Generate NSS certificate databases corresponding to the OpenSSL certificates.
+# This target will fail unless preceded by nssfiles-clean.
+nssfiles: $(NSSFILES)
+
 # OpenSSL requires a directory to put all generated certificates in. We don't
 # use this for anything, but we need a location.
 ssl/new_certs_dir:
@@ -67,6 +101,35 @@ ssl/%_ca.crt: ssl/%_ca.key %_ca.config ssl/root_ca.crt ssl/new_certs_dir
 	rm ssl/temp_ca.crt ssl/temp_ca_signed.crt
 	echo "01" > ssl/$*_ca.srl
 
+ssl/nss/%_ca.crt.db: ssl/%_ca.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n $*_ca.crt -i ssl/$*_ca.crt -t "CT,C,C"
+
+ssl/nss/root+server_ca.crt__server.crl.db: ssl/root+server_ca.crt ssl/nss/server.crl
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	crlutil -I -i ssl/nss/server.crl -d $@ -B
+
+ssl/nss/root+server_ca.crt__root+server.crl.db: ssl/root+server_ca.crt ssl/nss/root.crl ssl/nss/server.crl
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	crlutil -I -i ssl/nss/root.crl -d $@ -B
+	crlutil -I -i ssl/nss/server.crl -d $@ -B
+
+ssl/nss/root+server_ca.crt__root+server.crldir.db: ssl/root+server_ca.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	crlutil -I -i ssl/nss/root.crl -d $@ -B
+	for c in $(shell ls ssl/root+server-crldir) ; do \
+		echo $${c} ; \
+		openssl crl -in ssl/root+server-crldir/$${c} -outform der -out ssl/nss/$${c} ; \
+		crlutil -I -i ssl/nss/$${c} -d $@ -B ; \
+	done
+
 # Server certificates, signed by server CA:
 ssl/server-%.crt: ssl/server-%.key ssl/server_ca.crt server-%.config
 	openssl req -new -key ssl/server-$*.key -out ssl/server-$*.csr -config server-$*.config
@@ -80,6 +143,86 @@ ssl/server-ss.crt: ssl/server-cn-only.key ssl/server-cn-only.crt server-cn-only.
 	openssl x509 -req -days 10000 -in ssl/server-ss.csr -signkey ssl/server-cn-only.key -out ssl/server-ss.crt  -extensions v3_req -extfile server-cn-only.config
 	rm ssl/server-ss.csr
 
+# pk12util won't preserve the password when importing the password protected
+# key, the password must be set on the database *before* importing it as the
+# password in the pkcs12 envelope will be dropped.
+ssl/nss/server-cn-only.crt__server-password.key.db: ssl/server-cn-only.crt
+	$(MKDIR_P) $@
+	echo "secret1" > password.txt
+	certutil -d "sql:$@" -N -f password.txt
+	certutil -d "sql:$@" -A -n ssl/server-cn-only.crt -i ssl/server-cn-only.crt -t "CT,C,C" -f password.txt
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C" -f password.txt
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C" -f password.txt
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C" -f password.txt
+	openssl pkcs12 -export -out ssl/nss/server-password.pfx -inkey ssl/server-password.key -in ssl/server-cn-only.crt -certfile ssl/server_ca.crt -passin 'pass:secret1' -passout 'pass:secret1'
+	pk12util -i ssl/nss/server-password.pfx -d "sql:$@" -W 'secret1' -K 'secret1'
+
+ssl/nss/server-cn-only.crt__server-cn-only.key.db: ssl/server-cn-only.crt ssl/server-cn-only.key
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-cn-only.crt -i ssl/server-cn-only.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-cn-only.pfx -inkey ssl/server-cn-only.key -in ssl/server-cn-only.crt -certfile ssl/server_ca.crt -passout pass:
+	pk12util -i ssl/nss/server-cn-only.pfx -d "sql:$@" -W ''
+
+ssl/nss/server-cn-only.crt__server-cn-only.key.crldir.db: ssl/nss/server-cn-only.crt__server-cn-only.key.db
+	for c in $(shell ls ssl/root+client-crldir) ; do \
+		echo $${c} ; \
+		openssl crl -in ssl/root+client-crldir/$${c} -outform der -out ssl/nss/$${c} ; \
+		crlutil -I -i ssl/nss/$${c} -d $@ -B ; \
+	done
+
+ssl/nss/server-multiple-alt-names.crt__server-multiple-alt-names.key.db: ssl/server-multiple-alt-names.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-multiple-alt-names.crt -i ssl/server-multiple-alt-names.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-multiple-alt-names.pfx -inkey ssl/server-multiple-alt-names.key -in ssl/server-multiple-alt-names.crt -certfile ssl/server-multiple-alt-names.crt -passout pass:
+	pk12util -i ssl/nss/server-multiple-alt-names.pfx -d "sql:$@" -W ''
+
+ssl/nss/server-single-alt-name.crt__server-single-alt-name.key.db: ssl/server-single-alt-name.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-single-alt-name.crt -i ssl/server-single-alt-name.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-single-alt-name.pfx -inkey ssl/server-single-alt-name.key -in ssl/server-single-alt-name.crt -certfile ssl/server-single-alt-name.crt -passout pass:
+	pk12util -i ssl/nss/server-single-alt-name.pfx -d "sql:$@" -W ''
+
+ssl/nss/server-cn-and-alt-names.crt__server-cn-and-alt-names.key.db: ssl/server-cn-and-alt-names.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-cn-and-alt-names.crt -i ssl/server-cn-and-alt-names.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-cn-and-alt-names.pfx -inkey ssl/server-cn-and-alt-names.key -in ssl/server-cn-and-alt-names.crt -certfile ssl/server-cn-and-alt-names.crt -passout pass:
+	pk12util -i ssl/nss/server-cn-and-alt-names.pfx -d $@ -W ''
+
+ssl/nss/server-no-names.crt__server-no-names.key.db: ssl/server-no-names.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-no-names.crt -i ssl/server-no-names.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-no-names.pfx -inkey ssl/server-no-names.key -in ssl/server-no-names.crt -certfile ssl/server-no-names.crt -passout pass:
+	pk12util -i ssl/nss/server-no-names.pfx -d "sql:$@" -W ''
+
+ssl/nss/server-revoked.crt__server-revoked.key.db: ssl/server-revoked.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/server-revoked.crt -i ssl/server-revoked.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n server_ca.crt -i ssl/server_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root_ca.crt -i ssl/root_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/server-revoked.pfx -inkey ssl/server-revoked.key -in ssl/server-revoked.crt -certfile ssl/server-revoked.crt -passout pass:
+	pk12util -i ssl/nss/server-revoked.pfx -d "sql:$@" -W ''
+
 # Password-protected version of server-cn-only.key
 ssl/server-password.key: ssl/server-cn-only.key
 	openssl rsa -aes256 -in $< -out $@ -passout 'pass:secret1'
@@ -91,6 +234,27 @@ ssl/client.crt: ssl/client.key ssl/client_ca.crt
 	openssl x509 -in ssl/temp.crt -out ssl/client.crt # to keep just the PEM cert
 	rm ssl/client.csr ssl/temp.crt
 
+# Client certificate, signed by client CA
+ssl/nss/client.crt__client.key.db: ssl/client.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/client.crt -i ssl/client.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n root+client_ca.crt -i ssl/root+client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client.pfx -inkey ssl/client.key -in ssl/client.crt -certfile ssl/client_ca.crt -passout pass:
+	pk12util -i ssl/nss/client.pfx -d "sql:$@" -W ''
+
+# Client certificate with encrypted key, signed by client CA
+ssl/nss/client.crt__client-encrypted-pem.key.db: ssl/client.crt
+	$(MKDIR_P) $@
+	echo 'dUmmyP^#+' > $@.pass
+	certutil -d "sql:$@" -N -f $@.pass
+	certutil -d "sql:$@" -A -f $@.pass -n ssl/client.crt -i ssl/client.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -f $@.pass -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -f $@.pass -n root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client-encrypted-pem.pfx -inkey ssl/client-encrypted-pem.key -in ssl/client.crt -certfile ssl/client_ca.crt -passin pass:'dUmmyP^#+' -passout pass:'dUmmyP^#+'
+	pk12util -i ssl/nss/client-encrypted-pem.pfx -d "sql:$@" -W 'dUmmyP^#+' -k $@.pass
+
 # Another client certificate, signed by the client CA. This one is revoked.
 ssl/client-revoked.crt: ssl/client-revoked.key ssl/client_ca.crt client.config
 	openssl req -new -key ssl/client-revoked.key -out ssl/client-revoked.csr -config client.config
@@ -98,6 +262,14 @@ ssl/client-revoked.crt: ssl/client-revoked.key ssl/client_ca.crt client.config
 	openssl x509 -in ssl/temp.crt -out ssl/client-revoked.crt # to keep just the PEM cert
 	rm ssl/client-revoked.csr ssl/temp.crt
 
+ssl/nss/client-revoked.crt__client-revoked.key.db: ssl/client-revoked.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/client-revoked.crt -i ssl/client-revoked.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n client_ca.crt -i ssl/client_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client-revoked.pfx -inkey ssl/client-revoked.key -in ssl/client-revoked.crt -certfile ssl/client_ca.crt -passout pass:
+	pk12util -i ssl/nss/client-revoked.pfx -d "sql:$@" -W ''
+
 # Convert the key to DER, to test our behaviour there too
 ssl/client-der.key: ssl/client.key
 	openssl rsa -in ssl/client.key -outform DER -out ssl/client-der.key
@@ -130,19 +302,40 @@ ssl/root+client_ca.crt: ssl/root_ca.crt ssl/client_ca.crt
 ssl/client+client_ca.crt: ssl/client.crt ssl/client_ca.crt
 	cat $^ > $@
 
+# Client certificate, signed by client CA
+ssl/nss/client+client_ca.crt__client.key.db: ssl/client+client_ca.crt
+	$(MKDIR_P) $@
+	certutil -d "sql:$@" -N --empty-password
+	certutil -d "sql:$@" -A -n ssl/client+client_ca.crt -i ssl/client+client_ca.crt -t "CT,C,C"
+	certutil -d "sql:$@" -A -n ssl/root+server_ca.crt -i ssl/root+server_ca.crt -t "CT,C,C"
+	openssl pkcs12 -export -out ssl/nss/client.pfx -inkey ssl/client.key -in ssl/client.crt -certfile ssl/client_ca.crt -passout pass:
+	pk12util -i ssl/nss/client.pfx -d "sql:$@" -W ''
+
 #### CRLs
 
 ssl/client.crl: ssl/client-revoked.crt
 	openssl ca -config cas.config -name client_ca -revoke ssl/client-revoked.crt
 	openssl ca -config cas.config -name client_ca -gencrl -out ssl/client.crl
 
+ssl/nss/client.crl: ssl/client.crl
+	openssl crl -in $^ -outform der -out $@
+
 ssl/server.crl: ssl/server-revoked.crt
 	openssl ca -config cas.config -name server_ca -revoke ssl/server-revoked.crt
 	openssl ca -config cas.config -name server_ca -gencrl -out ssl/server.crl
 
+ssl/nss/server.crl: ssl/server.crl
+	openssl crl -in $^ -outform der -out $@
+
 ssl/root.crl: ssl/root_ca.crt
 	openssl ca -config cas.config -name root_ca -gencrl -out ssl/root.crl
 
+ssl/nss/root.crl: ssl/root.crl
+	openssl crl -in $^ -outform der -out $@
+
+ssl/nss/root+client.crl: ssl/root+client.crl
+	openssl crl -in $^ -outform der -out $@
+
 # If a CRL is used, OpenSSL requires a CRL file for *all* the CAs in the
 # chain, even if some of them are empty.
 ssl/root+server.crl: ssl/root.crl ssl/server.crl
@@ -168,14 +361,65 @@ ssl/client-crldir: ssl/client.crl
 	mkdir ssl/client-crldir
 	cp ssl/client.crl ssl/client-crldir/`openssl crl -hash -noout -in ssl/client.crl`.r0
 
+#### NSS specific certificates and keys
+
+ssl/nss/native_ca-%.db:
+	$(MKDIR_P) ssl/nss/native_ca-$*.db
+	certutil -N -d "sql:ssl/nss/native_ca-$*.db/" --empty-password
+	echo y > nss_ca_params.txt
+	echo 10 >> nss_ca_params.txt
+	echo y >> nss_ca_params.txt
+	cat nss_ca_params.txt | certutil -S -d "sql:ssl/nss/native_ca-$*.db/" -n ca-$* \
+	-s "CN=Test CA for PostgreSQL SSL regression tests,OU=PostgreSQL test suite" \
+	-x -k rsa -g 2048 -m 5432 -t CTu,CTu,CTu \
+	--keyUsage certSigning -2 --nsCertType sslCA,smimeCA,objectSigningCA \
+	-z Makefile -Z SHA256
+	rm nss_ca_params.txt
+
+ssl/nss/native_ca-%.pem: ssl/nss/native_ca-%.db
+	certutil -L -d "sql:ssl/nss/native_ca-$*.db/" -n ca-$* -a > ssl/nss/native_ca-$*.pem
+
+# Create and sign a server certificate
+ssl/nss/native_server-%.db: ssl/nss/native_ca-%.pem
+	$(MKDIR_P) ssl/nss/native_server-$*.db
+	certutil -N -d "sql:ssl/nss/native_server-$*.db/" --empty-password
+	certutil -R -d "sql:ssl/nss/native_server-$*.db/" \
+		-s "CN=common-name.pg-ssltest.test,OU=PostgreSQL test suite" \
+		-o ssl/nss/native_server-$*.csr -g 2048 -Z SHA256 -z Makefile
+	echo 1 > nss_server_params.txt
+	echo 9 >> nss_server_params.txt
+	cat nss_server_params.txt | certutil -C -d "sql:ssl/nss/native_ca-$*.db/" -c ca-root -i ssl/nss/native_server-$*.csr \
+		-o ssl/nss/native_server_$*.der -m 5433 --keyUsage dataEncipherment,digitalSignature,keyEncipherment \
+		--nsCertType sslServer --certVersion 1 -Z SHA256
+	certutil -A -d "sql:ssl/nss/native_server-$*.db/" -n ca-$* -t CTu,CTu,CTu -a -i ssl/nss/native_ca-$*.pem
+	certutil -A -d "sql:ssl/nss/native_server-$*.db/" -n ssl/native_server-$*.crt -t CTu,CTu,CTu -i ssl/nss/native_server_$*.der
+	rm nss_server_params.txt
+
+# Create and sign a client certificate
+ssl/nss/native_client-%.db: ssl/nss/native_ca-%.pem
+	$(MKDIR_P) ssl/nss/native_client-$*.db
+	certutil -N -d "sql:ssl/nss/native_client-$*.db/" --empty-password
+	certutil -R -d "sql:ssl/nss/native_client-$*.db/" -s "CN=ssltestuser,OU=PostgreSQL test suite" \
+		-o ssl/nss/native_client-$*.csr -g 2048 -Z SHA256 -z Makefile
+	certutil -C -d "sql:ssl/nss/native_ca-$*.db/" -c ca-$* -i ssl/nss/native_client-$*.csr -o ssl/nss/native_client-$*.der \
+		-m 5434 --keyUsage keyEncipherment,dataEncipherment,digitalSignature --nsCertType sslClient \
+		--certVersion 1 -Z SHA256
+	certutil -A -d "sql:ssl/nss/native_client-$*.db" -n ca-$* -t CTu,CTu,CTu -a -i ssl/nss/native_ca-$*.pem
+	certutil -A -d "sql:ssl/nss/native_client-$*.db" -n native_client-$* -t CTu,CTu,CTu -i ssl/nss/native_client-$*.der
+
 .PHONY: sslfiles-clean
 sslfiles-clean:
 	rm -f $(SSLFILES) ssl/client_ca.srl ssl/server_ca.srl ssl/client_ca-certindex* ssl/server_ca-certindex* ssl/root_ca-certindex* ssl/root_ca.srl ssl/temp_ca.crt ssl/temp_ca_signed.crt
 	rm -rf $(SSLDIRS)
 
+.PHONY: nssfiles-clean
+nssfiles-clean:
+	rm -rf ssl/nss
+
 clean distclean maintainer-clean:
 	rm -rf tmp_check
 	rm -rf ssl/*.old ssl/new_certs_dir ssl/client*_tmp.key
+	rm -rf ssl/nss
 
 # Doesn't depend on $(SSLFILES) because we don't rebuild them by default
 check:
diff --git a/src/test/ssl/t/001_ssltests.pl b/src/test/ssl/t/001_ssltests.pl
index 30b68bddbe..25efe791f3 100644
--- a/src/test/ssl/t/001_ssltests.pl
+++ b/src/test/ssl/t/001_ssltests.pl
@@ -9,13 +9,22 @@ use lib $FindBin::RealBin;
 
 use SSL::Server;
 
-if ($ENV{with_ssl} ne 'openssl')
+my $openssl;
+my $nss;
+
+if ($ENV{with_ssl} eq 'openssl')
+{
+	$openssl = 1;
+	plan tests => 103;
+}
+elsif ($ENV{with_ssl} eq 'nss')
 {
-	plan skip_all => 'OpenSSL not supported by this build';
+	$nss = 1;
+	plan tests => 104;
 }
 else
 {
-	plan tests => 100;
+	plan skip_all => 'SSL not supported by this build';
 }
 
 #### Some configuration
@@ -51,19 +60,70 @@ configure_test_server_for_ssl($node, $SERVERHOSTADDR, $SERVERHOSTCIDR,
 
 note "testing password-protected keys";
 
-set_server_cert($node, 'server-cn-only', 'root+client_ca',
-				   'server-password', 'echo wrongpassword');
-command_fails(
-	[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
-	'restart fails with password-protected key file with wrong password');
-$node->_update_pid(0);
+# Since the passphrase callbacks operate at different stages in OpenSSL and
+# NSS we have two separate blocks for them
+SKIP:
+{
+	skip "Certificate passphrases aren't checked on server restart in NSS", 2
+	  if ($nss);
+
+	switch_server_cert($node,
+		certfile => 'server-cn-only',
+		cafile => 'root+client_ca',
+		keyfile => 'server-password',
+		nssdatabase => 'server-cn-only.crt__server-password.key.db',
+		passphrase_cmd => 'echo wrongpassword',
+		restart => 'no' );
+
+	command_fails(
+		[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
+		'restart fails with password-protected key file with wrong password');
+	$node->_update_pid(0);
+
+	switch_server_cert($node,
+		certfile => 'server-cn-only',
+		cafile => 'root+client_ca',
+		keyfile => 'server-password',
+		nssdatabase => 'server-cn-only.crt__server-password.key.db',
+		passphrase_cmd => 'echo secret1',
+		restart => 'no');
+
+	command_ok(
+		[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
+		'restart succeeds with password-protected key file');
+	$node->_update_pid(1);
+}
 
-set_server_cert($node, 'server-cn-only', 'root+client_ca',
-				'server-password', 'echo secret1');
-command_ok(
-	[ 'pg_ctl', '-D', $node->data_dir, '-l', $node->logfile, 'restart' ],
-	'restart succeeds with password-protected key file');
-$node->_update_pid(1);
+SKIP:
+{
+	skip "Certificate passphrases are checked on connection in NSS", 3
+	  if ($openssl);
+
+	switch_server_cert($node,
+		certfile => 'server-cn-only',
+		cafile => 'root+client_ca',
+		keyfile => 'server-password',
+		nssdatabase => 'server-cn-only.crt__server-password.key.db',
+		passphrase_cmd => 'echo wrongpassword');
+
+	test_connect_fails(
+		"user=ssltestuser dbname=trustdb sslcert=invalid hostaddr=$SERVERHOSTADDR host=common-name.pg-ssltest.test",
+		"sslrootcert=invalid sslmode=require",
+		qr/\QSSL error\E/,
+		"connect to server with incorrect key password configured");
+
+	switch_server_cert($node,
+		certfile => 'server-cn-only',
+		cafile => 'root+client_ca',
+		keyfile => 'server-password',
+		nssdatabase => 'server-cn-only.crt__server-password.key.db',
+		passphrase_cmd => 'echo secret1');
+
+	test_connect_ok(
+		"user=ssltestuser dbname=trustdb sslcert=invalid hostaddr=$SERVERHOSTADDR host=common-name.pg-ssltest.test",
+		"sslrootcert=invalid sslmode=require",
+		"connect to server with correct key password configured");
+}
 
 # Test compatibility of SSL protocols.
 # TLSv1.1 is lower than TLSv1.2, so it won't work.
@@ -91,7 +151,7 @@ command_ok(
 
 note "running client tests";
 
-switch_server_cert($node, 'server-cn-only');
+switch_server_cert($node, certfile => 'server-cn-only', nssdatabase => 'server-cn-only.crt__server-cn-only.key.db');
 
 $common_connstr =
   "user=ssltestuser dbname=trustdb sslcert=invalid hostaddr=$SERVERHOSTADDR host=common-name.pg-ssltest.test";
@@ -111,95 +171,118 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"sslrootcert=invalid sslmode=verify-ca",
-	qr/root certificate file "invalid" does not exist/,
+	qr/root certificate file "invalid" does not exist|Peer's certificate issuer has been marked as not trusted by the user/,
 	"connect without server root cert sslmode=verify-ca");
 test_connect_fails(
 	$common_connstr,
 	"sslrootcert=invalid sslmode=verify-full",
-	qr/root certificate file "invalid" does not exist/,
+	qr/root certificate file "invalid" does not exist|Peer's certificate issuer has been marked as not trusted by the user/,
 	"connect without server root cert sslmode=verify-full");
 
 # Try with wrong root cert, should fail. (We're using the client CA as the
 # root, but the server's key is signed by the server CA.)
-test_connect_fails($common_connstr,
-	"sslrootcert=ssl/client_ca.crt sslmode=require",
-	qr/SSL error/, "connect with wrong server root cert sslmode=require");
-test_connect_fails($common_connstr,
-	"sslrootcert=ssl/client_ca.crt sslmode=verify-ca",
-	qr/SSL error/, "connect with wrong server root cert sslmode=verify-ca");
-test_connect_fails($common_connstr,
-	"sslrootcert=ssl/client_ca.crt sslmode=verify-full",
-	qr/SSL error/, "connect with wrong server root cert sslmode=verify-full");
-
-# Try with just the server CA's cert. This fails because the root file
-# must contain the whole chain up to the root CA.
-test_connect_fails($common_connstr,
-	"sslrootcert=ssl/server_ca.crt sslmode=verify-ca",
-	qr/SSL error/, "connect with server CA cert, without root CA");
+test_connect_fails(
+	$common_connstr,
+	"sslrootcert=ssl/client_ca.crt sslmode=require cert_database=ssl/nss/client_ca.crt.db",
+	qr/SSL error/,
+	"connect with wrong server root cert sslmode=require");
+test_connect_fails(
+	$common_connstr,
+	"sslrootcert=ssl/client_ca.crt sslmode=verify-ca cert_database=ssl/nss/client_ca.crt.db",
+	qr/SSL error/,
+	"connect with wrong server root cert sslmode=verify-ca");
+test_connect_fails(
+	$common_connstr,
+	"sslrootcert=ssl/client_ca.crt sslmode=verify-full cert_database=ssl/nss/client_ca.crt.db",
+	qr/SSL error/,
+	"connect with wrong server root cert sslmode=verify-full");
+
+SKIP:
+{
+	# NSS supports partial chain validation, so this test doesn't work there.
+	# This is similar to the OpenSSL option X509_V_FLAG_PARTIAL_CHAIN which
+	# we don't allow.
+	skip "NSS support partial chain validation", 2 if ($nss);
+	# Try with just the server CA's cert. This fails because the root file
+	# must contain the whole chain up to the root CA.
+	test_connect_fails($common_connstr,
+		"sslrootcert=ssl/server_ca.crt sslmode=verify-ca",
+		qr/SSL error/, "connect with server CA cert, without root CA");
+}
 
 # And finally, with the correct root cert.
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require cert_database=ssl/nss/root+server_ca.crt.db",
 	"connect with correct server CA cert file sslmode=require");
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca cert_database=ssl/nss/root+server_ca.crt.db",
 	"connect with correct server CA cert file sslmode=verify-ca");
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-full",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db",
 	"connect with correct server CA cert file sslmode=verify-full");
 
-# Test with cert root file that contains two certificates. The client should
-# be able to pick the right one, regardless of the order in the file.
-test_connect_ok(
-	$common_connstr,
-	"sslrootcert=ssl/both-cas-1.crt sslmode=verify-ca",
-	"cert root file that contains two certificates, order 1");
-test_connect_ok(
-	$common_connstr,
-	"sslrootcert=ssl/both-cas-2.crt sslmode=verify-ca",
-	"cert root file that contains two certificates, order 2");
+SKIP:
+{
+	skip "CA ordering is irrelevant in NSS databases", 2 if ($nss);
+
+	# Test with cert root file that contains two certificates. The client should
+	# be able to pick the right one, regardless of the order in the file.
+	test_connect_ok(
+		$common_connstr,
+		"sslrootcert=ssl/both-cas-1.crt sslmode=verify-ca",
+		"cert root file that contains two certificates, order 1");
 
+	# How about import the both-file into a database?
+	test_connect_ok(
+		$common_connstr,
+		"sslrootcert=ssl/both-cas-2.crt sslmode=verify-ca",
+		"cert root file that contains two certificates, order 2");
+}
 # CRL tests
 
 # Invalid CRL filename is the same as no CRL, succeeds
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=invalid",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=invalid cert_database=ssl/nss/root+server_ca.crt.db",
 	"sslcrl option with invalid file name");
 
-# A CRL belonging to a different CA is not accepted, fails
-test_connect_fails(
-	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/client.crl",
-	qr/SSL error/,
-	"CRL belonging to a different CA");
+SKIP:
+{
+	skip "CRL's are verified when adding to NSS database", 4 if ($nss);
+	# A CRL belonging to a different CA is not accepted, fails
+	test_connect_fails(
+		$common_connstr,
+		"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/client.crl",
+		qr/SSL error/,
+		"CRL belonging to a different CA");
 
-# The same for CRL directory
-test_connect_fails(
-	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrldir=ssl/client-crldir",
-	qr/SSL error/,
-	"directory CRL belonging to a different CA");
+	# The same for CRL directory
+	test_connect_fails(
+		$common_connstr,
+		"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrldir=ssl/client-crldir",
+		qr/SSL error/,
+		"directory CRL belonging to a different CA");
+}
 
 # With the correct CRL, succeeds (this cert is not revoked)
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/root+server.crl",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/root+server.crl cert_database=ssl/nss/root+server_ca.crt__root+server.crl.db",
 	"CRL with a non-revoked cert");
 
 # The same for CRL directory
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrldir=ssl/root+server-crldir",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrldir=ssl/root+server-crldir cert_database=ssl/nss/root+server_ca.crt__root+server.crldir.db",
 	"directory CRL with a non-revoked cert");
 
 # Check that connecting with verify-full fails, when the hostname doesn't
 # match the hostname in the server's certificate.
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -212,14 +295,14 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"sslmode=verify-full host=wronghost.test",
-	qr/\Qserver certificate for "common-name.pg-ssltest.test" does not match host name "wronghost.test"\E/,
+	qr/\Qserver certificate for "common-name.pg-ssltest.test" does not match host name "wronghost.test"\E|requested domain name does not match the server's certificate/,
 	"mismatch between host name and server certificate sslmode=verify-full");
 
 # Test Subject Alternative Names.
-switch_server_cert($node, 'server-multiple-alt-names');
+switch_server_cert($node, certfile => 'server-multiple-alt-names', nssdatabase => 'server-multiple-alt-names.crt__server-multiple-alt-names.key.db');
 
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -237,20 +320,20 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"host=wronghost.alt-name.pg-ssltest.test",
-	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "wronghost.alt-name.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "wronghost.alt-name.pg-ssltest.test"\E|requested domain name does not match the server's certificate/,
 	"host name not matching with X.509 Subject Alternative Names");
 test_connect_fails(
 	$common_connstr,
 	"host=deep.subdomain.wildcard.pg-ssltest.test",
-	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 2 other names) does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E|requested domain name does not match the server's certificate/,
 	"host name not matching with X.509 Subject Alternative Names wildcard");
 
 # Test certificate with a single Subject Alternative Name. (this gives a
 # slightly different error message, that's all)
-switch_server_cert($node, 'server-single-alt-name');
+switch_server_cert($node, certfile => 'server-single-alt-name', nssdatabase => 'server-single-alt-name.crt__server-single-alt-name.key.db');
 
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -260,21 +343,21 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"host=wronghost.alt-name.pg-ssltest.test",
-	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "wronghost.alt-name.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "wronghost.alt-name.pg-ssltest.test"\E|requested domain name does not match the server's certificate/,
 	"host name not matching with a single X.509 Subject Alternative Name");
 test_connect_fails(
 	$common_connstr,
 	"host=deep.subdomain.wildcard.pg-ssltest.test",
-	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "single.alt-name.pg-ssltest.test" does not match host name "deep.subdomain.wildcard.pg-ssltest.test"\E|requested domain name does not match the server's certificate/,
 	"host name not matching with a single X.509 Subject Alternative Name wildcard"
 );
 
 # Test server certificate with a CN and SANs. Per RFCs 2818 and 6125, the CN
 # should be ignored when the certificate has both.
-switch_server_cert($node, 'server-cn-and-alt-names');
+switch_server_cert($node, certfile => 'server-cn-and-alt-names', nssdatabase => 'server-cn-and-alt-names.crt__server-cn-and-alt-names.key.db');
 
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR sslmode=verify-full cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -287,14 +370,14 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"host=common-name.pg-ssltest.test",
-	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 1 other name) does not match host name "common-name.pg-ssltest.test"\E/,
+	qr/\Qserver certificate for "dns1.alt-name.pg-ssltest.test" (and 1 other name) does not match host name "common-name.pg-ssltest.test"\E|requested domain name does not match the server's certificate/,
 	"certificate with both a CN and SANs ignores CN");
 
 # Finally, test a server certificate that has no CN or SANs. Of course, that's
 # not a very sensible certificate, but libpq should handle it gracefully.
-switch_server_cert($node, 'server-no-names');
+switch_server_cert($node, certfile => 'server-no-names', nssdatabase => 'server-no-names.crt__server-no-names.key.db');
 $common_connstr =
-  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR";
+  "user=ssltestuser dbname=trustdb sslcert=invalid sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/root+server_ca.crt.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -303,11 +386,11 @@ test_connect_ok(
 test_connect_fails(
 	$common_connstr,
 	"sslmode=verify-full host=common-name.pg-ssltest.test",
-	qr/could not get server's host name from server certificate/,
+	qr/could not get server's host name from server certificate|requested domain name does not match the server's certificate./,
 	"server certificate without CN or SANs sslmode=verify-full");
 
 # Test that the CRL works
-switch_server_cert($node, 'server-revoked');
+switch_server_cert($node, certfile => 'server-revoked', nssdatabase => 'server-revoked.crt__server-revoked.key.db');
 
 $common_connstr =
   "user=ssltestuser dbname=trustdb sslcert=invalid hostaddr=$SERVERHOSTADDR host=common-name.pg-ssltest.test";
@@ -315,16 +398,16 @@ $common_connstr =
 # Without the CRL, succeeds. With it, fails.
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca cert_database=ssl/nss/root+server_ca.crt.db",
 	"connects without client-side CRL");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/root+server.crl",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrl=ssl/server.crl cert_database=ssl/nss/root+server_ca.crt__server.crl.db",
 	qr/SSL error/,
 	"does not connect with client-side CRL file");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrldir=ssl/root+server-crldir",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=verify-ca sslcrldir=ssl/root+server-crldir cert_database=ssl/nss/root+server_ca.crt__root+server.crldir.db",
 	qr/SSL error/,
 	"does not connect with client-side CRL directory");
 
@@ -345,32 +428,50 @@ command_like(
 # Test min/max SSL protocol versions.
 test_connect_ok(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.2",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.2 cert_database=ssl/nss/root+server_ca.crt.db",
 	"connection success with correct range of TLS protocol versions");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.1",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=TLSv1.2 ssl_max_protocol_version=TLSv1.1 cert_database=ssl/nss/root+server_ca.crt.db",
 	qr/invalid SSL protocol version range/,
 	"connection failure with incorrect range of TLS protocol versions");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=incorrect_tls",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_min_protocol_version=incorrect_tls cert_database=ssl/nss/root+server_ca.crt.db",
 	qr/invalid ssl_min_protocol_version value/,
 	"connection failure with an incorrect SSL protocol minimum bound");
 test_connect_fails(
 	$common_connstr,
-	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_max_protocol_version=incorrect_tls",
+	"sslrootcert=ssl/root+server_ca.crt sslmode=require ssl_max_protocol_version=incorrect_tls cert_database=ssl/nss/root+server_ca.crt.db",
 	qr/invalid ssl_max_protocol_version value/,
 	"connection failure with an incorrect SSL protocol maximum bound");
 
+# tests of NSS generated certificates/keys
+SKIP:
+{
+	skip "NSS specific tests",            1 if ($openssl);
+
+	switch_server_cert($node, certfile => 'native_server-root', cafile => 'native_ca-root', nssdatabase => 'native_server-root.db');
+	$common_connstr =
+	  "user=ssltestuser dbname=trustdb hostaddr=$SERVERHOSTADDR host=common-name.pg-ssltest.test";
+
+	test_connect_ok(
+		$common_connstr,
+		"sslmode=require user=ssltestuser",
+		"NSS generated certificates"
+	);
+}
+
 ### Server-side tests.
 ###
 ### Test certificate authorization.
 
+switch_server_cert($node, certfile => 'server-revoked', nssdatabase => 'server-revoked.crt__server-revoked.key.db');
+
 note "running server tests";
 
 $common_connstr =
-  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR";
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client.crt__client.key.db";
 
 # no client cert
 test_connect_fails(
@@ -386,32 +487,43 @@ test_connect_ok(
 	"certificate authorization succeeds with correct client cert in PEM format"
 );
 
-# correct client cert in unencrypted DER
-test_connect_ok(
-	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-der_tmp.key",
-	"certificate authorization succeeds with correct client cert in DER format"
-);
+$common_connstr =
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR";
+
+SKIP:
+{
+	skip "NSS database not implemented in the Makefile", 1 if ($nss);
+	# correct client cert in unencrypted DER
+	test_connect_ok(
+		$common_connstr,
+		"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-der_tmp.key",
+		"certificate authorization succeeds with correct client cert in DER format"
+	);
+}
 
 # correct client cert in encrypted PEM
 test_connect_ok(
 	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='dUmmyP^#+'",
+	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='dUmmyP^#+' cert_database=ssl/nss/client.crt__client-encrypted-pem.key.db",
 	"certificate authorization succeeds with correct client cert in encrypted PEM format"
 );
 
-# correct client cert in encrypted DER
-test_connect_ok(
-	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-der_tmp.key sslpassword='dUmmyP^#+'",
-	"certificate authorization succeeds with correct client cert in encrypted DER format"
-);
+SKIP:
+{
+	skip "NSS database not implemented in the Makefile", 1 if ($nss);
+	# correct client cert in encrypted DER
+	test_connect_ok(
+		$common_connstr,
+		"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-der_tmp.key sslpassword='dUmmyP^#+'",
+		"certificate authorization succeeds with correct client cert in encrypted DER format"
+	);
+}
 
 # correct client cert in encrypted PEM with wrong password
 test_connect_fails(
 	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='wrong'",
-	qr!\Qprivate key file "ssl/client-encrypted-pem_tmp.key": bad decrypt\E!,
+	"user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client-encrypted-pem_tmp.key sslpassword='wrong' cert_database=ssl/nss/client.crt__client-encrypted-pem.key.db",
+	qr!connection requires a valid client certificate|\Qprivate key file "ssl/client-encrypted-pem_tmp.key": bad decrypt\E!,
 	"certificate authorization fails with correct client cert and wrong password in encrypted PEM format"
 );
 
@@ -451,18 +563,19 @@ command_like(
 		'-P',
 		'null=_null_',
 		'-d',
-		"$common_connstr user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client_tmp.key",
+		"$common_connstr user=ssltestuser sslcert=ssl/client.crt sslkey=ssl/client_tmp.key cert_database=ssl/nss/client.crt__client.key.db",
 		'-c',
 		"SELECT * FROM pg_stat_ssl WHERE pid = pg_backend_pid()"
 	],
 	qr{^pid,ssl,version,cipher,bits,compression,client_dn,client_serial,issuer_dn\r?\n
-				^\d+,t,TLSv[\d.]+,[\w-]+,\d+,f,/CN=ssltestuser,1,\Q/CN=Test CA for PostgreSQL SSL regression test client certs\E\r?$}mx,
+				^\d+,t,TLSv[\d.]+,[\w-]+,\d+,f,/?CN=ssltestuser,1,/?\QCN=Test CA for PostgreSQL SSL regression test client certs\E\r?$}mx,
 	'pg_stat_ssl with client certificate');
 
 # client key with wrong permissions
 SKIP:
 {
 	skip "Permissions check not enforced on Windows", 2 if ($windows_os);
+	skip "Key not on filesystem with NSS",            2 if ($nss);
 
 	test_connect_fails(
 		$common_connstr,
@@ -475,10 +588,13 @@ SKIP:
 test_connect_fails(
 	$common_connstr,
 	"user=anotheruser sslcert=ssl/client.crt sslkey=ssl/client_tmp.key",
-	qr/certificate authentication failed for user "anotheruser"/,
+	qr/unable to verify certificate|certificate authentication failed for user "anotheruser"/,
 	"certificate authorization fails with client cert belonging to another user"
 );
 
+$common_connstr =
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=certdb hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client-revoked.crt__client-revoked.key.db";
+
 # revoked client cert
 test_connect_fails(
 	$common_connstr,
@@ -490,7 +606,7 @@ test_connect_fails(
 # works, iff username matches Common Name
 # fails, iff username doesn't match Common Name.
 $common_connstr =
-  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=verifydb hostaddr=$SERVERHOSTADDR";
+  "sslrootcert=ssl/root+server_ca.crt sslmode=require dbname=verifydb hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client.crt__client.key.db";
 
 test_connect_ok(
 	$common_connstr,
@@ -514,24 +630,28 @@ test_connect_ok(
 );
 
 # intermediate client_ca.crt is provided by client, and isn't in server's ssl_ca_file
-switch_server_cert($node, 'server-cn-only', 'root_ca');
+switch_server_cert($node, certfile => 'server-cn-only', cafile => 'root_ca', nssdatabase => 'server-cn-only.crt__server-cn-only.key.db');
 $common_connstr =
-  "user=ssltestuser dbname=certdb sslkey=ssl/client_tmp.key sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR";
+  "user=ssltestuser dbname=certdb sslkey=ssl/client_tmp.key sslrootcert=ssl/root+server_ca.crt hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client+client_ca.crt__client.key.db";
 
 test_connect_ok(
 	$common_connstr,
 	"sslmode=require sslcert=ssl/client+client_ca.crt",
 	"intermediate client certificate is provided by client");
-test_connect_fails($common_connstr, "sslmode=require sslcert=ssl/client.crt",
-	qr/SSL error/, "intermediate client certificate is missing");
+
+test_connect_fails(
+	$common_connstr,
+	"sslmode=require sslcert=ssl/client.crt",
+	qr/connection requires a valid client certificate|SSL error/,
+	"intermediate client certificate is missing");
 
 # test server-side CRL directory
-switch_server_cert($node, 'server-cn-only', undef, undef, 'root+client-crldir');
+switch_server_cert($node, certfile => 'server-cn-only', crldir => 'root+client-crldir', nssdatabase => 'server-cn-only.crt__server-cn-only.key.crldir.db');
 
 # revoked client cert
 test_connect_fails(
 	$common_connstr,
-	"user=ssltestuser sslcert=ssl/client-revoked.crt sslkey=ssl/client-revoked_tmp.key",
+	"user=ssltestuser sslcert=ssl/client-revoked.crt sslkey=ssl/client-revoked_tmp.key cert_database=ssl/nss/client-revoked.crt__client-revoked.key.db",
 	qr/SSL error/,
 	"certificate authorization fails with revoked client cert with server-side CRL directory");
 
diff --git a/src/test/ssl/t/002_scram.pl b/src/test/ssl/t/002_scram.pl
index 3383b3e531..801c945e88 100644
--- a/src/test/ssl/t/002_scram.pl
+++ b/src/test/ssl/t/002_scram.pl
@@ -13,7 +13,26 @@ use lib $FindBin::RealBin;
 
 use SSL::Server;
 
-if ($ENV{with_ssl} ne 'openssl')
+my $openssl;
+my $nss;
+
+my $supports_tls_server_end_point;
+
+if ($ENV{with_ssl} eq 'openssl')
+{
+	$openssl = 1;
+	# Determine whether build supports tls-server-end-point.
+	$supports_tls_server_end_point =
+		check_pg_config("#define HAVE_X509_GET_SIGNATURE_NID 1");
+	plan tests => $supports_tls_server_end_point ? 9 : 10;
+}
+elsif ($ENV{with_ssl} eq 'nss')
+{
+	$nss = 1;
+	$supports_tls_server_end_point = 1;
+	plan tests => 9;
+}
+else
 {
 	plan skip_all => 'SSL not supported by this build';
 }
@@ -23,12 +42,6 @@ my $SERVERHOSTADDR = '127.0.0.1';
 # This is the pattern to use in pg_hba.conf to match incoming connections.
 my $SERVERHOSTCIDR = '127.0.0.1/32';
 
-# Determine whether build supports tls-server-end-point.
-my $supports_tls_server_end_point =
-  check_pg_config("#define HAVE_X509_GET_SIGNATURE_NID 1");
-
-my $number_of_tests = $supports_tls_server_end_point ? 9 : 10;
-
 # Allocation of base connection string shared among multiple tests.
 my $common_connstr;
 
@@ -47,7 +60,7 @@ $node->start;
 # Configure server for SSL connections, with password handling.
 configure_test_server_for_ssl($node, $SERVERHOSTADDR, $SERVERHOSTCIDR,
 	"scram-sha-256", "pass", "scram-sha-256");
-switch_server_cert($node, 'server-cn-only');
+switch_server_cert($node, certfile => 'server-cn-only', nssdatabase => 'server-cn-only.crt__server-cn-only.key.db');
 $ENV{PGPASSWORD} = "pass";
 $common_connstr =
   "dbname=trustdb sslmode=require sslcert=invalid sslrootcert=invalid hostaddr=$SERVERHOSTADDR";
@@ -97,7 +110,7 @@ my $client_tmp_key = "ssl/client_scram_tmp.key";
 copy("ssl/client.key", $client_tmp_key);
 chmod 0600, $client_tmp_key;
 test_connect_fails(
-	"sslcert=ssl/client.crt sslkey=$client_tmp_key sslrootcert=invalid hostaddr=$SERVERHOSTADDR",
+	"sslcert=ssl/client.crt sslkey=$client_tmp_key sslrootcert=invalid hostaddr=$SERVERHOSTADDR cert_database=ssl/nss/client.crt__client.key.db",
 	"dbname=certdb user=ssltestuser channel_binding=require",
 	qr/channel binding required, but server authenticated client without channel binding/,
 	"Cert authentication and channel_binding=require");
diff --git a/src/test/ssl/t/SSL/Backend/NSS.pm b/src/test/ssl/t/SSL/Backend/NSS.pm
new file mode 100644
index 0000000000..20633fe41b
--- /dev/null
+++ b/src/test/ssl/t/SSL/Backend/NSS.pm
@@ -0,0 +1,61 @@
+package SSL::Backend::NSS;
+
+use strict;
+use warnings;
+use Exporter;
+
+our @ISA       = qw(Exporter);
+our @EXPORT_OK = qw(get_new_nss_backend);
+
+sub new
+{
+	my ($class) = @_;
+
+	my $self = { _library => 'NSS' };
+
+	bless $self, $class;
+
+	return $self;
+}
+
+sub get_new_nss_backend
+{
+	my $class = 'SSL::Backend::NSS';
+
+	return $class->new();
+}
+
+sub init
+{
+	# Make sure the certificate databases are in place?
+}
+
+sub get_library
+{
+	my ($self) = @_;
+
+	return $self->{_library};
+}
+
+sub set_server_cert
+{
+	my $self   = $_[0];
+	my $params = $_[1];
+
+	$params->{cafile} = 'root+client_ca' unless defined $params->{cafile};
+
+	my $sslconf =
+	    "ssl_ca_file='$params->{cafile}.crt'\n"
+	  . "ssl_cert_file='ssl/$params->{certfile}.crt'\n"
+	  . "ssl_crl_file=''\n"
+	  . "ssl_database='nss/$params->{nssdatabase}'\n";
+
+	return $sslconf;
+}
+
+sub cleanup
+{
+	# Something?
+}
+
+1;
diff --git a/src/test/ssl/t/SSL/Backend/OpenSSL.pm b/src/test/ssl/t/SSL/Backend/OpenSSL.pm
index 62b11b7632..f74caf67fe 100644
--- a/src/test/ssl/t/SSL/Backend/OpenSSL.pm
+++ b/src/test/ssl/t/SSL/Backend/OpenSSL.pm
@@ -71,16 +71,19 @@ sub init
 # the server so that the configuration takes effect.
 sub set_server_cert
 {
-	my $self     = $_[0];
-	my $certfile = $_[1];
-	my $cafile   = $_[2] || "root+client_ca";
-	my $keyfile  = $_[3] || $certfile;
+	my $self   = $_[0];
+	my $params = $_[1];
+
+	$params->{cafile} = 'root+client_ca' unless defined $params->{cafile};
+	$params->{crlfile} = 'root+client.crl' unless defined $params->{crlfile};
+	$params->{keyfile} = $params->{certfile} unless defined $params->{keyfile};
 
 	my $sslconf =
-	    "ssl_ca_file='$cafile.crt'\n"
-	  . "ssl_cert_file='$certfile.crt'\n"
-	  . "ssl_key_file='$keyfile.key'\n"
-	  . "ssl_crl_file='root+client.crl'\n";
+	    "ssl_ca_file='$params->{cafile}.crt'\n"
+	  . "ssl_cert_file='$params->{certfile}.crt'\n"
+	  . "ssl_key_file='$params->{keyfile}.key'\n"
+	  . "ssl_crl_file='$params->{crlfile}'\n";
+	$sslconf .= "ssl_crl_dir='$params->{crldir}'\n" if defined $params->{crldir};
 
 	return $sslconf;
 }
diff --git a/src/test/ssl/t/SSL/Server.pm b/src/test/ssl/t/SSL/Server.pm
index e59554f85b..da25645d25 100644
--- a/src/test/ssl/t/SSL/Server.pm
+++ b/src/test/ssl/t/SSL/Server.pm
@@ -55,7 +55,6 @@ elsif ($ENV{with_ssl} eq 'nss')
 use Exporter 'import';
 our @EXPORT = qw(
   configure_test_server_for_ssl
-  set_server_cert
   switch_server_cert
   test_connect_fails
   test_connect_ok
@@ -202,46 +201,25 @@ sub cleanup
 	$backend->cleanup();
 }
 
-# Change the configuration to use given server cert file,
-sub set_server_cert
+# Change the configuration to use the given set of certificate, key, ca and
+# CRL, and potentially reload the configuration by restarting the server so
+# that the configuration takes effect.  Restarting is the default, passing
+# restart => 'no' opts out of it leaving the server running.
+sub switch_server_cert
 {
-	my $node     = $_[0];
-	my $certfile = $_[1];
-	my $cafile   = $_[2] || "root+client_ca";
-	my $keyfile  = $_[3] || '';
-	my $pwcmd    = $_[4] || '';
-	my $crlfile  = "root+client.crl";
-	my $crldir;
-	my $pgdata   = $node->data_dir;
-
-	$keyfile = $certfile if $keyfile eq '';
-
-	# defaults to use crl file
-	if (defined $_[3] || defined $_[4])
-	{
-		$crlfile = $_[3];
-		$crldir = $_[4];
-	}
+	my $node   = shift;
+	my %params = @_;
+	my $pgdata = $node->data_dir;
 
 	open my $sslconf, '>', "$pgdata/sslconfig.conf";
 	print $sslconf "ssl=on\n";
-	print $sslconf $backend->set_server_cert($certfile, $cafile, $keyfile);
-	print $sslconf "ssl_crl_file='$crlfile'\n" if defined $crlfile;
-	print $sslconf "ssl_crl_dir='$crldir'\n" if defined $crldir;
-	print $sslconf "ssl_passphrase_command='$pwcmd'\n"
-	  unless $pwcmd eq '';
+	print $sslconf $backend->set_server_cert(\%params);
+	print $sslconf "ssl_passphrase_command='" . $params{passphrase_cmd} . "'\n"
+	  if defined $params{passphrase_cmd};
 	close $sslconf;
-	return;
-}
 
-# Change the configuration to use given server cert file, and reload
-# the server so that the configuration takes effect.
-# Takes the same arguments as set_server_cert, which it calls to do that
-# piece of the work.
-sub switch_server_cert
-{
-	my $node = $_[0];
-	set_server_cert(@_);
+	return if (defined($params{restart}) && $params{restart} eq 'no');
+
 	$node->restart;
 	return;
 }
-- 
2.21.1 (Apple Git-122.3)

From 1cf91c96694b75ee3270fef57ddc932577de48f6 Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Mon, 8 Feb 2021 23:52:39 +0100
Subject: [PATCH v30 4/9] nss: pg_strong_random support

This adds support for using the RNG in libnss as a backend for
pg_strong_random.
---
 src/port/pg_strong_random.c | 50 ++++++++++++++++++++++++++++++++++++-
 1 file changed, 49 insertions(+), 1 deletion(-)

diff --git a/src/port/pg_strong_random.c b/src/port/pg_strong_random.c
index 07f24c0089..40de237628 100644
--- a/src/port/pg_strong_random.c
+++ b/src/port/pg_strong_random.c
@@ -137,7 +137,55 @@ pg_strong_random(void *buf, size_t len)
 	return false;
 }
 
-#else							/* not USE_OPENSSL or WIN32 */
+#elif defined(USE_NSS)
+
+#define pg_BITS_PER_BYTE BITS_PER_BYTE
+#undef BITS_PER_BYTE
+#define NO_NSPR_10_SUPPORT
+#include <nss/nss.h>
+#include <nss/pk11pub.h>
+#if defined(BITS_PER_BYTE)
+#if BITS_PER_BYTE != pg_BITS_PER_BYTE
+#error "incompatible byte widths between NSPR and postgres"
+#endif
+#else
+#define BITS_PER_BYTE pg_BITS_PER_BYTE
+#endif
+#undef pg_BITS_PER_BYTE
+
+void
+pg_strong_random_init(void)
+{
+	/* No initialization needed on NSS */
+}
+
+bool
+pg_strong_random(void *buf, size_t len)
+{
+	NSSInitParameters params;
+	NSSInitContext *nss_context;
+	SECStatus	status;
+
+	memset(&params, 0, sizeof(params));
+	params.length = sizeof(params);
+	nss_context = NSS_InitContext("", "", "", "", &params,
+								  NSS_INIT_READONLY | NSS_INIT_NOCERTDB |
+								  NSS_INIT_NOMODDB | NSS_INIT_FORCEOPEN |
+								  NSS_INIT_NOROOTINIT | NSS_INIT_PK11RELOAD);
+
+	if (!nss_context)
+		return false;
+
+	status = PK11_GenerateRandom(buf, len);
+	NSS_ShutdownContext(nss_context);
+
+	if (status == SECSuccess)
+		return true;
+
+	return false;
+}
+
+#else							/* not USE_OPENSSL, USE_NSS or WIN32 */
 
 /*
  * Without OpenSSL or Win32 support, just read /dev/urandom ourselves.
-- 
2.21.1 (Apple Git-122.3)

From 7fe27c0915af47f8d252c35ce3dde90cde4b4784 Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Mon, 8 Feb 2021 23:52:42 +0100
Subject: [PATCH v30 5/9] nss: Documentation

Basic documentation of the new API (keypass hooks) as well as config
parameters and installation. Additionally there is a section on how
to create certificate and keys using the NSS toolchain.
---
 doc/src/sgml/acronyms.sgml     |  43 +++++
 doc/src/sgml/config.sgml       |  28 ++-
 doc/src/sgml/installation.sgml |  31 ++-
 doc/src/sgml/libpq.sgml        | 340 +++++++++++++++++++++++++--------
 doc/src/sgml/runtime.sgml      | 124 +++++++++++-
 5 files changed, 476 insertions(+), 90 deletions(-)

diff --git a/doc/src/sgml/acronyms.sgml b/doc/src/sgml/acronyms.sgml
index 4e5ec983c0..7b02c8a622 100644
--- a/doc/src/sgml/acronyms.sgml
+++ b/doc/src/sgml/acronyms.sgml
@@ -441,6 +441,28 @@
     </listitem>
    </varlistentry>
 
+   <varlistentry>
+    <term><acronym>NSPR</acronym></term>
+    <listitem>
+     <para>
+      <ulink
+      url="https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSPR">
+      Netscape Portable Runtime</ulink>
+     </para>
+    </listitem>
+   </varlistentry>
+
+   <varlistentry>
+    <term><acronym>NSS</acronym></term>
+    <listitem>
+     <para>
+      <ulink
+      url="https://developer.mozilla.org/en-US/docs/Mozilla/Projects/NSS">
+      Network Security Services</ulink>
+     </para>
+    </listitem>
+   </varlistentry>
+
    <varlistentry>
     <term><acronym>ODBC</acronym></term>
     <listitem>
@@ -539,6 +561,17 @@
     </listitem>
    </varlistentry>
 
+   <varlistentry>
+    <term><acronym>PKCS#12</acronym></term>
+    <listitem>
+     <para>
+      <ulink
+      url="https://en.wikipedia.org/wiki/PKCS_12">
+      Public-Key Cryptography Standards #12</ulink>
+     </para>
+    </listitem>
+   </varlistentry>
+
    <varlistentry>
     <term><acronym>PL</acronym></term>
     <listitem>
@@ -684,6 +717,16 @@
     </listitem>
    </varlistentry>
 
+   <varlistentry>
+    <term><acronym>TLS</acronym></term>
+    <listitem>
+     <para>
+      <ulink url="https://en.wikipedia.org/wiki/Transport_Layer_Security">
+      Transport Layer Security</ulink>
+     </para>
+    </listitem>
+   </varlistentry>
+
    <varlistentry>
     <term><acronym>TOAST</acronym></term>
     <listitem>
diff --git a/doc/src/sgml/config.sgml b/doc/src/sgml/config.sgml
index 967de73596..1608e9a7c7 100644
--- a/doc/src/sgml/config.sgml
+++ b/doc/src/sgml/config.sgml
@@ -1272,6 +1272,23 @@ include_dir 'conf.d'
       </listitem>
      </varlistentry>
 
+     <varlistentry id="guc-ssl-database" xreflabel="ssl_database">
+      <term><varname>ssl_database</varname> (<type>string</type>)
+      <indexterm>
+       <primary><varname>ssl_database</varname> configuration parameter</primary>
+      </indexterm>
+      </term>
+      <listitem>
+       <para>
+        Specifies the name of the file containing the server certificates and
+        keys when using <productname>NSS</productname> for <acronym>SSL</acronym>
+        connections. This parameter can only be set in the
+        <filename>postgresql.conf</filename> file or on the server command
+        line.
+       </para>
+      </listitem>
+     </varlistentry>
+
      <varlistentry id="guc-ssl-ciphers" xreflabel="ssl_ciphers">
       <term><varname>ssl_ciphers</varname> (<type>string</type>)
       <indexterm>
@@ -1288,7 +1305,9 @@ include_dir 'conf.d'
         connections using TLS version 1.2 and lower are affected.  There is
         currently no setting that controls the cipher choices used by TLS
         version 1.3 connections.  The default value is
-        <literal>HIGH:MEDIUM:+3DES:!aNULL</literal>.  The default is usually a
+        <literal>HIGH:MEDIUM:+3DES:!aNULL</literal> for servers which have
+        been built with <productname>OpenSSL</productname> as the
+        <acronym>SSL</acronym> library.  The default is usually a
         reasonable choice unless you have specific security requirements.
        </para>
 
@@ -1490,8 +1509,11 @@ include_dir 'conf.d'
        <para>
         Sets an external command to be invoked when a passphrase for
         decrypting an SSL file such as a private key needs to be obtained.  By
-        default, this parameter is empty, which means the built-in prompting
-        mechanism is used.
+        default, this parameter is empty. When the server is using
+        <productname>OpenSSL</productname>, this means the built-in prompting
+        mechanism is used. When using <productname>NSS</productname>, there is
+        no default prompting so a blank callback will be used returning an
+        empty password.
        </para>
        <para>
         The command must print the passphrase to the standard output and exit
diff --git a/doc/src/sgml/installation.sgml b/doc/src/sgml/installation.sgml
index 66ad4ba938..3cbd125d59 100644
--- a/doc/src/sgml/installation.sgml
+++ b/doc/src/sgml/installation.sgml
@@ -976,14 +976,31 @@ build-postgresql:
        <listitem>
         <para>
          Build with support for <acronym>SSL</acronym> (encrypted)
-         connections. The only <replaceable>LIBRARY</replaceable>
-         supported is <option>openssl</option>. This requires the
-         <productname>OpenSSL</productname> package to be installed.
-         <filename>configure</filename> will check for the required
-         header files and libraries to make sure that your
-         <productname>OpenSSL</productname> installation is sufficient
-         before proceeding. 
+         connections. <replaceable>LIBRARY</replaceable> must be one of:
         </para>
+        <itemizedlist>
+         <listitem>
+          <para>
+           <option>openssl</option> to build with <productname>OpenSSL</productname> support.
+            This requires the <productname>OpenSSL</productname>
+            package to be installed.  <filename>configure</filename> will check
+            for the required header files and libraries to make sure that
+            your <productname>OpenSSL</productname> installation is sufficient
+            before proceeding.
+          </para>
+         </listitem>
+         <listitem>
+          <para>
+           <option>nss</option> to build with <productname>libnss</productname> support.
+            This requires the <productname>NSS</productname> package to be installed. Additionally,
+            <productname>NSS</productname> requires <productname>NSPR</productname>
+            to be installed. <filename>configure</filename> will check for the
+            required header files and libraries to make sure that your
+            <productname>NSS</productname> installation is sufficient before
+            proceeding.
+          </para>
+         </listitem>
+        </itemizedlist>
        </listitem>
       </varlistentry>
 
diff --git a/doc/src/sgml/libpq.sgml b/doc/src/sgml/libpq.sgml
index cc20b0f234..73f94158c7 100644
--- a/doc/src/sgml/libpq.sgml
+++ b/doc/src/sgml/libpq.sgml
@@ -830,6 +830,12 @@ int callback_fn(char *buf, int size, PGconn *conn);
        <function>longjmp(...)</function>, etc. It must return normally.
       </para>
 
+      <para>
+        <function>PQsetSSLKeyPassHook_OpenSSL</function> has no effect unless
+        the server was compiled with <productname>OpenSSL</productname>
+        support.
+      </para>
+
      </listitem>
     </varlistentry>
 
@@ -846,6 +852,70 @@ PQsslKeyPassHook_OpenSSL_type PQgetSSLKeyPassHook_OpenSSL(void);
 </synopsis>
       </para>
 
+      <para>
+        <function>PQgetSSLKeyPassHook_OpenSSL</function> has no effect unless
+        the server was compiled with <productname>OpenSSL</productname>
+        support.
+      </para>
+
+     </listitem>
+    </varlistentry>
+
+    <varlistentry id="libpq-pqsetsslkeypasshook-nss">
+     <term><function>PQsetSSLKeyPassHook_nss</function><indexterm><primary>PQsetSSLKeyPassHook_nss</primary></indexterm></term>
+     <listitem>
+      <para>
+       <function>PQsetSSLKeyPassHook_nss</function> lets an application override
+       <application>libpq</application>'s default handling of password protected
+       objects in the <application>NSS</application> database using
+       <xref linkend="libpq-connect-sslpassword"/> or interactive prompting.
+
+<synopsis>
+void PQsetSSLKeyPassHook_nss(PQsslKeyPassHook_nss_type hook);
+</synopsis>
+
+       The application passes a pointer to a callback function with signature:
+<programlisting>
+char *callback_fn(PK11SlotInfo *slot, PRBool retry, void *arg);
+</programlisting>
+       which <application>libpq</application> will call
+       <emphasis>instead of</emphasis> its default
+       <function>PQdefaultSSLKeyPassHook_nss</function> password handler. The
+       callback should determine the password for the token and return a
+       pointer to it. The returned pointer should be allocated with the NSS
+       <function>PORT_Strdup</function> function. The token for which the
+       password is requested is recorded in the slot anc can be identified by
+       calling <function>PK11_GetTokenName</function>. If no password is
+       known, the callback should return <literal>NULL</literal>. The memory
+       will be owned by <productname>NSS</productname> and should not be
+       freed.
+      </para>
+
+      <para>
+        <function>PQsetSSLKeyPassHook_nss</function> has no effect unless
+        the server was compiled with <productname>NSS</productname> support.
+      </para>
+     </listitem>
+    </varlistentry>
+
+    <varlistentry id="libpq-pqgetsslkeypasshook-nss">
+     <term><function>PQgetSSLKeyPassHook_nss</function><indexterm><primary>PQgetSSLKeyPassHook_nss</primary></indexterm></term>
+     <listitem>
+      <para>
+       <function>PQgetSSLKeyPassHook_nss</function> returns the current
+       <productname>NSS</productname> password hook, or <literal>NULL</literal>
+       if none has been set.
+
+<synopsis>
+PQsslKeyPassHook_nss_type PQgetSSLKeyPassHook_nss(void);
+</synopsis>
+      </para>
+
+      <para>
+        <function>PQgetSSLKeyPassHook_nss</function> has no effect unless the
+        server was compiled with <productname>nss</productname> support.
+      </para>
+
      </listitem>
     </varlistentry>
 
@@ -1638,21 +1708,31 @@ postgresql://%2Fvar%2Flib%2Fpostgresql/dbname
         If set to 1, data sent over SSL connections will be compressed.  If
         set to 0, compression will be disabled.  The default is 0.  This
         parameter is ignored if a connection without SSL is made.
-       </para>
-
-       <para>
         SSL compression is nowadays considered insecure and its use is no
-        longer recommended.  <productname>OpenSSL</productname> 1.1.0 disables
-        compression by default, and many operating system distributions
-        disable it in prior versions as well, so setting this parameter to on
-        will not have any effect if the server does not accept compression.
-       </para>
+        longer recommended.
+        <itemizedlist>
+         <listitem>
+          <para>
+           <productname>OpenSSL</productname>: 1.1.0 disables compression by
+           default, and many operating system distributions disable it in prior
+           versions as well, so setting this parameter to on will not have any
+           effect if the server does not accept compression.
+          </para>
+          <para>
+           If security is not a primary concern, compression can improve
+           throughput if the network is the bottleneck.  Disabling compression
+           can improve response time and throughput if CPU performance is the
+           limiting factor.
+          </para>
+         </listitem>
 
-       <para>
-        If security is not a primary concern, compression can improve
-        throughput if the network is the bottleneck.  Disabling compression
-        can improve response time and throughput if CPU performance is the
-        limiting factor.
+         <listitem>
+          <para>
+           <productname>NSS</productname>: SSL compression is not supported in
+           <productname>NSS</productname>, this parameter has no effect.
+          </para>
+         </listitem>
+        </itemizedlist>
        </para>
       </listitem>
      </varlistentry>
@@ -1661,10 +1741,24 @@ postgresql://%2Fvar%2Flib%2Fpostgresql/dbname
       <term><literal>sslcert</literal></term>
       <listitem>
        <para>
-        This parameter specifies the file name of the client SSL
-        certificate, replacing the default
-        <filename>~/.postgresql/postgresql.crt</filename>.
-        This parameter is ignored if an SSL connection is not made.
+        This parameter specifies the name or location of the client SSL
+        certificate.  This parameter is ignored if an SSL connection is not
+        made.
+        <itemizedlist>
+         <listitem>
+          <para>
+           <productname>OpenSSL</productname>: can replace the default
+           <filename>~/.postgresql/postgresql.crt</filename>.
+          </para>
+         </listitem>
+
+         <listitem>
+          <para>
+           <productname>NSS</productname>: the nickname of the client SSL
+           certificate.
+          </para>
+         </listitem>
+        </itemizedlist>
        </para>
       </listitem>
      </varlistentry>
@@ -1673,15 +1767,30 @@ postgresql://%2Fvar%2Flib%2Fpostgresql/dbname
       <term><literal>sslkey</literal></term>
       <listitem>
        <para>
-        This parameter specifies the location for the secret key used for
-        the client certificate. It can either specify a file name that will
-        be used instead of the default
-        <filename>~/.postgresql/postgresql.key</filename>, or it can specify a key
-        obtained from an external <quote>engine</quote> (engines are
-        <productname>OpenSSL</productname> loadable modules).  An external engine
-        specification should consist of a colon-separated engine name and
-        an engine-specific key identifier.  This parameter is ignored if an
-        SSL connection is not made.
+        This parameter specifies the name or location for the secret key used
+        for the client certificate. This parameter is ignored if an SSL
+        connection is not made.
+        <itemizedlist>
+         <listitem>
+          <para>
+           <productname>OpenSSL</productname>: can either specify a file name
+           that will be used instead of the default
+           <filename>~/.postgresql/postgresql.key</filename>, or it can specify
+           a key obtained from an external <quote>engine</quote> (engines are
+           <productname>OpenSSL</productname> loadable modules).  An external
+           engine specification should consist of a colon-separated engine name
+           and an engine-specific key identifier.
+          </para>
+         </listitem>
+
+         <listitem>
+          <para>
+           <productname>NSS</productname>: this parameter has no effect.  Keys
+           should be loaded into the <productname>NSS</productname>
+           database.
+          </para>
+         </listitem>
+        </itemizedlist>
        </para>
       </listitem>
      </varlistentry>
@@ -1692,28 +1801,44 @@ postgresql://%2Fvar%2Flib%2Fpostgresql/dbname
        <para>
         This parameter specifies the password for the secret key specified in
         <literal>sslkey</literal>, allowing client certificate private keys
-        to be stored in encrypted form on disk even when interactive passphrase
+        to be stored in encrypted form even when interactive passphrase
         input is not practical.
-       </para>
-       <para>
-        Specifying this parameter with any non-empty value suppresses the
-        <literal>Enter PEM pass phrase:</literal>
-        prompt that <productname>OpenSSL</productname> will emit by default
-        when an encrypted client certificate key is provided to
-        <literal>libpq</literal>.
-       </para>
-       <para>
-        If the key is not encrypted this parameter is ignored. The parameter
-        has no effect on keys specified by <productname>OpenSSL</productname>
-        engines unless the engine uses the <productname>OpenSSL</productname>
-        password callback mechanism for prompts.
-       </para>
-       <para>
-        There is no environment variable equivalent to this option, and no
-        facility for looking it up in <filename>.pgpass</filename>. It can be
-        used in a service file connection definition. Users with
-        more sophisticated uses should consider using openssl engines and
-        tools like PKCS#11 or USB crypto offload devices.
+        <itemizedlist>
+         <listitem>
+          <para>
+           <productname>OpenSSL</productname>: specifying this parameter with
+           any non-empty value suppresses the
+           <literal>Enter PEM pass phrase:</literal> prompt that
+           <productname>OpenSSL</productname> will emit by default when an
+           encrypted client certificate key is provided to
+           <literal>libpq</literal>.
+          </para>
+          <para>
+           If the key is not encrypted this parameter is ignored. The parameter
+           has no effect on keys specified by <productname>OpenSSL</productname>
+           engines unless the engine uses the <productname>OpenSSL</productname>
+           password callback mechanism for prompts.
+          </para>
+          <para>
+           There is no environment variable equivalent to this option, and no
+           facility for looking it up in <filename>.pgpass</filename>. It can be
+           used in a service file connection definition. Users with
+           more sophisticated uses should consider using
+           <productname>OpenSSL</productname> engines and tools like PKCS#11 or
+           USB crypto offload devices.
+          </para>
+         </listitem>
+
+         <listitem>
+          <para>
+           <productname>NSS</productname>: specifying the parameter is required
+           in case any password protected items are referenced in the
+           <productname>NSS</productname> database, or if the database itself
+           is password protected.  If multiple different objects are password
+           protected, the same password is used for all.
+          </para>
+         </listitem>
+        </itemizedlist>
        </para>
       </listitem>
      </varlistentry>
@@ -1722,11 +1847,27 @@ postgresql://%2Fvar%2Flib%2Fpostgresql/dbname
       <term><literal>sslrootcert</literal></term>
       <listitem>
        <para>
-        This parameter specifies the name of a file containing SSL
-        certificate authority (<acronym>CA</acronym>) certificate(s).
-        If the file exists, the server's certificate will be verified
-        to be signed by one of these authorities.  The default is
-        <filename>~/.postgresql/root.crt</filename>.
+        This parameter specifies the name of SSL certificate authority
+        (<acronym>CA</acronym>) certificate(s).
+        <itemizedlist>
+         <listitem>
+          <para>
+           <productname>OpenSSL</productname>: specifies the name of a file
+           containing SSL certificate authority (<acronym>CA</acronym>)
+           certificate(s).  If the file exists, the server's certificate will
+           be verified to be signed by one of these authorities.  The default is
+           <filename>~/.postgresql/root.crt</filename>.
+          </para>
+         </listitem>
+
+         <listitem>
+          <para>
+           <productname>NSS</productname>: this parameter has no effect.  CA
+           certificates should be loaded into the <productname>NSS</productname>
+           database using the <application>certutil</application> tool.
+          </para>
+         </listitem>
+        </itemizedlist>
        </para>
       </listitem>
      </varlistentry>
@@ -1736,13 +1877,29 @@ postgresql://%2Fvar%2Flib%2Fpostgresql/dbname
       <listitem>
        <para>
         This parameter specifies the file name of the SSL certificate
-        revocation list (CRL).  Certificates listed in this file, if it
-        exists, will be rejected while attempting to authenticate the
-        server's certificate.  If neither
-        <xref linkend='libpq-connect-sslcrl'/> nor
-        <xref linkend='libpq-connect-sslcrldir'/> is set, this setting is
-        taken as
-        <filename>~/.postgresql/root.crl</filename>.
+        revocation list (CRL).  
+
+        <itemizedlist>
+         <listitem>
+          <para>
+           <productname>OpenSSL</productname>: Certificates listed in this file,
+           if it exists, will be rejected while attempting to authenticate the
+           server's certificate.  If neither
+           <xref linkend='libpq-connect-sslcrl'/> nor
+           <xref linkend='libpq-connect-sslcrldir'/> is set, this setting is
+           taken as <filename>~/.postgresql/root.crl</filename>. 
+          </para>
+         </listitem>
+
+         <listitem>
+          <para>
+           <productname>NSS</productname>: This parameter has no effect.  CRL
+           files should be loaded into the <productname>NSS</productname>
+           database using the <application>crlutil</application> tool.
+          </para>
+         </listitem>
+        </itemizedlist>
+
        </para>
       </listitem>
      </varlistentry>
@@ -1755,18 +1912,30 @@ postgresql://%2Fvar%2Flib%2Fpostgresql/dbname
         revocation list (CRL).  Certificates listed in the files in this
         directory, if it exists, will be rejected while attempting to
         authenticate the server's certificate.
-       </para>
 
-       <para>
-        The directory needs to be prepared with the OpenSSL command
-        <literal>openssl rehash</literal> or <literal>c_rehash</literal>.  See
-        its documentation for details.
-       </para>
+        <itemizedlist>
+         <listitem>
+          <para>
+           <productname>OpenSSL</productname>: the directory needs to be
+           prepared with the OpenSSL command <literal>openssl rehash</literal>
+           or <literal>c_rehash</literal>.  See its documentation for details.
+          </para>
+          <para>
+           Both <literal>sslcrl</literal> and <literal>sslcrldir</literal> can
+           be specified together.
+          </para>
+         </listitem>
 
-       <para>
-        Both <literal>sslcrl</literal> and <literal>sslcrldir</literal> can be
-        specified together.
+         <listitem>
+          <para>
+           <productname>NSS</productname>: This parameter has no effect.  CRL
+           files should be loaded into the <productname>NSS</productname>
+           database using the <application>crlutil</application> tool.
+          </para>
+         </listitem>
+        </itemizedlist>
        </para>
+
       </listitem>
      </varlistentry>
 
@@ -1801,8 +1970,8 @@ postgresql://%2Fvar%2Flib%2Fpostgresql/dbname
         for the connection. Valid values are <literal>TLSv1</literal>,
         <literal>TLSv1.1</literal>, <literal>TLSv1.2</literal> and
         <literal>TLSv1.3</literal>. The supported protocols depend on the
-        version of <productname>OpenSSL</productname> used, older versions
-        not supporting the most modern protocol versions. If not specified,
+        version of the SSL library used, older versions may 
+        not support the most modern protocol versions. If not specified,
         the default is <literal>TLSv1.2</literal>, which satisfies industry
         best practices as of this writing.
        </para>
@@ -1817,8 +1986,8 @@ postgresql://%2Fvar%2Flib%2Fpostgresql/dbname
         for the connection. Valid values are <literal>TLSv1</literal>,
         <literal>TLSv1.1</literal>, <literal>TLSv1.2</literal> and
         <literal>TLSv1.3</literal>. The supported protocols depend on the
-        version of <productname>OpenSSL</productname> used, older versions
-        not supporting the most modern protocol versions. If not set, this
+        version of the SSL library used, older versions
+        may not support the most modern protocol versions. If not set, this
         parameter is ignored and the connection will use the maximum bound
         defined by the backend, if set. Setting the maximum protocol version
         is mainly useful for testing or if some component has issues working
@@ -2597,6 +2766,8 @@ void *PQsslStruct(const PGconn *conn, const char *struct_name);
       </para>
       <para>
        The struct(s) available depend on the SSL implementation in use.
+      </para>
+      <para>
        For <productname>OpenSSL</productname>, there is one struct,
        available under the name "OpenSSL", and it returns a pointer to the
        <productname>OpenSSL</productname> <literal>SSL</literal> struct.
@@ -2620,9 +2791,14 @@ void *PQsslStruct(const PGconn *conn, const char *struct_name);
 ]]></programlisting>
       </para>
       <para>
-       This structure can be used to verify encryption levels, check server
-       certificates, and more. Refer to the <productname>OpenSSL</productname>
-       documentation for information about this structure.
+       For <productname>NSS</productname>, there is one struct available under
+       the name "NSS", and it returns a pointer to the
+       <productname>NSS</productname> <literal>PRFileDesc</literal>.
+      </para>
+      <para>
+       These structures can be used to verify encryption levels, check server
+       certificates, and more. Refer to the <acronym>SSL</acronym> library
+       documentation for information about these structures.
       </para>
      </listitem>
     </varlistentry>
@@ -2649,6 +2825,10 @@ void *PQgetssl(const PGconn *conn);
        <xref linkend="libpq-PQsslInUse"/> instead, and for more details about the
        connection, use <xref linkend="libpq-PQsslAttribute"/>.
       </para>
+      <para>
+       This function returns <literal>NULL</literal> when <acronym>SSL</acronym>
+       librariaes other than <productname>OpenSSL</productname> are used.
+      </para>
      </listitem>
     </varlistentry>
 
@@ -8082,6 +8262,11 @@ void PQinitOpenSSL(int do_ssl, int do_crypto);
        before first opening a database connection.  Also be sure that you
        have done that initialization before opening a database connection.
       </para>
+
+      <para>
+       This function does nothing when using <productname>NSS</productname> as
+       the <acronym>SSL</acronym> library.
+      </para>
      </listitem>
     </varlistentry>
 
@@ -8108,6 +8293,11 @@ void PQinitSSL(int do_ssl);
        might be preferable for applications that need to work with older
        versions of <application>libpq</application>.
       </para>
+
+      <para>
+       This function does nothing when using <productname>NSS</productname> as
+       the <acronym>SSL</acronym> library.
+      </para>
      </listitem>
     </varlistentry>
    </variablelist>
diff --git a/doc/src/sgml/runtime.sgml b/doc/src/sgml/runtime.sgml
index bf877c0e0c..1fcad17a51 100644
--- a/doc/src/sgml/runtime.sgml
+++ b/doc/src/sgml/runtime.sgml
@@ -2185,15 +2185,21 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
 
   <indexterm zone="ssl-tcp">
    <primary>SSL</primary>
+   <secondary>TLS</secondary>
   </indexterm>
 
   <para>
    <productname>PostgreSQL</productname> has native support for using
    <acronym>SSL</acronym> connections to encrypt client/server communications
    for increased security. This requires that
-   <productname>OpenSSL</productname> is installed on both client and
+   a supported TLS library is installed on both client and
    server systems and that support in <productname>PostgreSQL</productname> is
    enabled at build time (see <xref linkend="installation"/>).
+   Supported libraries are <productname>OpenSSL</productname> and
+   <productname>NSS</productname>. The terms <acronym>SSL</acronym> and
+   <acronym>TLS</acronym> are often used interchangeably to mean a secure
+   connection using a <acronym>TLS</acronym> protocol, even though
+   <acronym>SSL</acronym> protocols are no longer supported.
   </para>
 
   <sect2 id="ssl-setup">
@@ -2213,8 +2219,13 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
   </para>
 
   <para>
-   To start in <acronym>SSL</acronym> mode, files containing the server certificate
-   and private key must exist.  By default, these files are expected to be
+   To start in <acronym>SSL</acronym> mode, a server certificate
+   and private key must exist. The below sections on the different libraries
+   will discuss how to configure these.
+  </para>
+   
+  <para>
+   By default, these files are expected to be
    named <filename>server.crt</filename> and <filename>server.key</filename>, respectively, in
    the server's data directory, but other names and locations can be specified
    using the configuration parameters <xref linkend="guc-ssl-cert-file"/>
@@ -2304,6 +2315,18 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
   </note>
   </sect2>
 
+  <sect2 id="ssl-nss-config">
+   <title>NSS Configuration</title>
+
+  <para>
+   <productname>PostgreSQL</productname> will look for certificates and keys
+   in the <productname>NSS</productname> database specified by the parameter
+   <xref linkend="guc-ssl-database"/> in <filename>postgresql.conf</filename>.
+   The parameters for certificate and key filenames are used to identify the
+   nicknames in the database.
+  </para>
+  </sect2>
+
   <sect2 id="ssl-client-certificates">
    <title>Using Client Certificates</title>
 
@@ -2378,7 +2401,7 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
   </sect2>
 
   <sect2 id="ssl-server-files">
-   <title>SSL Server File Usage</title>
+   <title>SSL Server File Parameter Usage</title>
 
    <para>
     <xref linkend="ssl-file-usage"/> summarizes the files that are
@@ -2425,6 +2448,14 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
       <entry>client certificate must not be on this list</entry>
      </row>
 
+     <row>
+      <entry><xref linkend="guc-ssl-database"/></entry>
+      <entry>certificate database</entry>
+      <entry>contains server certificates, keys and revocation lists; only
+      used when <productname>PostgreSQL</productname> is built with support
+      for <productname>NSS</productname>.</entry>
+     </row>
+
     </tbody>
    </tgroup>
   </table>
@@ -2448,7 +2479,7 @@ pg_dumpall -p 5432 | psql -d postgres -p 5433
   </sect2>
 
   <sect2 id="ssl-certificate-creation">
-   <title>Creating Certificates</title>
+   <title>Creating Certificates with OpenSSL</title>
 
    <para>
      To create a simple self-signed certificate for the server, valid for 365
@@ -2552,6 +2583,89 @@ openssl x509 -req -in server.csr -text -days 365 \
    </para>
   </sect2>
 
+  <sect2 id="nss-certificate-database">
+   <title>NSS Certificate Databases</title>
+
+   <para>
+    When using <productname>NSS</productname>, all certificates and keys must
+    be loaded into an <productname>NSS</productname> certificate database.
+   </para>
+
+   <para>
+    To create a new <productname>NSS</productname> certificate database and
+    load the certificates created in <xref linkend="ssl-certificate-creation" />,
+    use the following <productname>NSS</productname> commands:
+<programlisting>
+certutil -d "sql:server.db" -N --empty-password
+certutil -d "sql:server.db" -A -n server.crt -i server.crt -t "CT,C,C"
+certutil -d "sql:server.db" -A -n root.crt -i root.crt -t "CT,C,C"
+</programlisting>
+    This will give the certificate the filename as the nickname identifier in
+    the database which is created as <filename>server.db</filename>.
+   </para>
+   <para>
+    Then load the server key, which require converting it to
+    <acronym>PKCS#12</acronym> format using the
+    <productname>OpenSSL</productname> tools:
+<programlisting>
+openssl pkcs12 -export -out server.pfx -inkey server.key -in server.crt \
+  -certfile root.crt -passout pass:
+pk12util -i server.pfx -d server.db -W ''
+</programlisting>
+   </para>
+   <para>
+    Finally a certificate revocation list can be loaded with the following
+    commands:
+<programlisting>
+crlutil -I -i server.crl -d server.db -B
+</programlisting>
+   </para>
+  </sect2>
+
+  <sect2 id="nss-ssl-certificate-creation">
+   <title>Creating Certificates with NSS</title>
+
+   <para>
+    To create a simple self-signed CA and certificate for the server, use the
+    following NSS commands. Replace
+    <replaceable>*.yourdomain.com</replaceable> with the server's host
+    name. Remove <replaceable>--empty-password</replaceable> in order to set
+    a password protecting the databases. The password can be passed to
+    <application>certutil</application> with the <literal>-f</literal> parameter.
+    First create a self-signed CA. To use a different certificate validity
+    time than the default, use <replaceable>-v</replaceable> to specify the
+    number of months of validity.
+<programlisting>
+mkdir root_ca.db
+certutil -N -d "sql:root_ca.db/" --empty-password
+certutil -S -d "sql:root_ca.db/" -n root_ca -s "CN=<replaceable>ca.yourdomain.com</replaceable>" \
+  -x -k rsa -g 2048 -m <replaceable>5432</replaceable> -t CTu,CTu,CTu \
+  --keyUsage certSigning -2 --nsCertType sslCA,smimeCA,objectSigningCA \
+  -Z SHA256
+certutil -L -d "sql:root_ca.db/" -n root_ca -a > root_ca.pem
+</programlisting>
+    Now create a server certificate database, and create a certificate signing
+    request for the CA. Then sign the request with the already created CA and
+    insert the certificate chain into the certificate database.
+<programlisting>
+mkdir server_cert.db
+certutil -N -d "sql:server_cert.db/" --empty-password
+certutil -R -d "sql:server_cert.db/" -s "CN=dbhost.yourdomain.com" \
+  -o server_cert.csr -g 2048 -Z SHA256
+
+certutil -C -d "sql:root_ca.db/" -c root_ca -i server_cert.csr \
+  -o server_cert.der -m <replaceable>5433</replaceable> \
+  --keyUsage keyEncipherment,dataEncipherment,digitalSignature \
+  --nsCertType sslServer -Z SHA256
+
+certutil -A -d "sql:server_cert.db/" -n root_ca -t CTu,CTu,CTu -a -i root_ca.pem
+certutil -A -d "sql:server_cert.db/" -n server_cert -t CTu,CTu,CTu -i server_cert.der
+</programlisting>
+    The server certificate is loaded into the certificate database as well as
+    the CA certificate in order to provide the chain of certificates.
+   </para>
+  </sect2>
+
  </sect1>
 
  <sect1 id="gssapi-enc">
-- 
2.21.1 (Apple Git-122.3)

From 0874ca2ce4b0fb31f6c935c65fc1ca78747af0fd Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Mon, 8 Feb 2021 23:52:45 +0100
Subject: [PATCH v30 6/9] nss: Support NSS in pgcrypto

This extends pgcrypto to be able to use libnss as a cryptographic
backend for pgcrypto much like how OpenSSL is a supported backend.
Blowfish is not a supported cipher in NSS, so the implementation
falls back on the built-in BF code to be compatible in terms of
cipher support.
---
 contrib/pgcrypto/Makefile  |   7 +-
 contrib/pgcrypto/nss.c     | 753 +++++++++++++++++++++++++++++++++++++
 doc/src/sgml/pgcrypto.sgml |  38 +-
 3 files changed, 787 insertions(+), 11 deletions(-)
 create mode 100644 contrib/pgcrypto/nss.c

diff --git a/contrib/pgcrypto/Makefile b/contrib/pgcrypto/Makefile
index c0b4f1fcf6..ede7a78146 100644
--- a/contrib/pgcrypto/Makefile
+++ b/contrib/pgcrypto/Makefile
@@ -7,11 +7,14 @@ INT_TESTS = sha2
 OSSL_SRCS = openssl.c pgp-mpi-openssl.c
 OSSL_TESTS = sha2 des 3des cast5
 
+NSS_SRCS = nss.c pgp-mpi-internal.c imath.c blf.c
+NSS_TESTS = sha2 des 3des
+
 ZLIB_TST = pgp-compression
 ZLIB_OFF_TST = pgp-zlib-DISABLED
 
-CF_SRCS = $(if $(subst openssl,,$(with_ssl)), $(INT_SRCS), $(OSSL_SRCS))
-CF_TESTS = $(if $(subst openssl,,$(with_ssl)), $(INT_TESTS), $(OSSL_TESTS))
+CF_SRCS = $(if $(findstring openssl, $(with_ssl)), $(OSSL_SRCS), $(if $(findstring nss, $(with_ssl)), $(NSS_SRCS), $(INT_SRCS)))
+CF_TESTS = $(if $(findstring openssl, $(with_ssl)), $(OSSL_TESTS), $(if $(findstring nss, $(with_ssl)), $(NSS_TESTS), $(INT_TESTS)))
 CF_PGP_TESTS = $(if $(subst no,,$(with_zlib)), $(ZLIB_TST), $(ZLIB_OFF_TST))
 
 SRCS = \
diff --git a/contrib/pgcrypto/nss.c b/contrib/pgcrypto/nss.c
new file mode 100644
index 0000000000..d4fd4680ec
--- /dev/null
+++ b/contrib/pgcrypto/nss.c
@@ -0,0 +1,753 @@
+/*-------------------------------------------------------------------------
+ *
+ * nss.c
+ *	  Wrapper for using NSS as a backend for pgcrypto PX
+ *
+ *
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ *	  contrib/pgcrypto/nss.c
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#include "postgres.h"
+
+#include "px.h"
+#include "blf.h"
+#include "common/nss.h"
+#include "utils/memutils.h"
+
+#include <nss/nss.h>
+#include <nss/hasht.h>
+#include <nss/pk11func.h>
+#include <nss/pk11pub.h>
+#include <nss/secitem.h>
+#include <nss/sechash.h>
+#include <nss/secoid.h>
+#include <nss/secerr.h>
+
+/*
+ * Define our own mechanisms for Blowfish as it's not implemented by NSS.
+ */
+#define BLOWFISH_CBC	(1)
+#define BLOWFISH_ECB	(2)
+
+/*
+ * Data structures for recording cipher implementations as well as ongoing
+ * cipher operations.
+ */
+typedef struct nss_digest
+{
+	NSSInitContext *context;
+	PK11Context *hash_context;
+	HASH_HashType hash_type;
+}			nss_digest;
+
+typedef struct cipher_implementation
+{
+	/* Function pointers to cipher operations */
+	int			(*init) (PX_Cipher *pxc, const uint8 *key, unsigned klen, const uint8 *iv);
+	unsigned	(*get_block_size) (PX_Cipher *pxc);
+	unsigned	(*get_key_size) (PX_Cipher *pxc);
+	unsigned	(*get_iv_size) (PX_Cipher *pxc);
+	int			(*encrypt) (PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res);
+	int			(*decrypt) (PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res);
+	void		(*free) (PX_Cipher *pxc);
+
+	/* The mechanism describing the cipher used */
+	union
+	{
+		CK_MECHANISM_TYPE nss;
+		CK_ULONG	internal;
+	}			mechanism;
+	int			keylen;
+	bool		is_nss;
+}			cipher_implementation;
+
+typedef struct nss_cipher
+{
+	const cipher_implementation *impl;
+	NSSInitContext *context;
+	PK11Context *crypt_context;
+	SECItem    *params;
+
+	PK11SymKey *encrypt_key;
+	PK11SymKey *decrypt_key;
+}			nss_cipher;
+
+typedef struct internal_cipher
+{
+	const cipher_implementation *impl;
+	BlowfishContext context;
+}			internal_cipher;
+
+typedef struct nss_cipher_ref
+{
+	const char *name;
+	const cipher_implementation *impl;
+}			nss_cipher_ref;
+
+/*
+ * Prototypes
+ */
+static unsigned nss_get_iv_size(PX_Cipher *pxc);
+static unsigned nss_get_block_size(PX_Cipher *pxc);
+
+/*
+ * nss_GetHashOidTagByHashType
+ *
+ * Returns the corresponding SECOidTag for the passed hash type. NSS 3.43
+ * includes HASH_GetHashOidTagByHashType for this purpose, but at the time of
+ * writing is not commonly available so we need our own version till then.
+ */
+static SECOidTag
+nss_GetHashOidTagByHashType(HASH_HashType type)
+{
+	if (type == HASH_AlgMD2)
+		return SEC_OID_MD2;
+	if (type == HASH_AlgMD5)
+		return SEC_OID_MD5;
+	if (type == HASH_AlgSHA1)
+		return SEC_OID_SHA1;
+	if (type == HASH_AlgSHA224)
+		return SEC_OID_SHA224;
+	if (type == HASH_AlgSHA256)
+		return SEC_OID_SHA256;
+	if (type == HASH_AlgSHA384)
+		return SEC_OID_SHA384;
+	if (type == HASH_AlgSHA512)
+		return SEC_OID_SHA512;
+
+	return SEC_OID_UNKNOWN;
+}
+
+static unsigned
+nss_digest_block_size(PX_MD *pxmd)
+{
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+	const SECHashObject *object;
+
+	object = HASH_GetHashObject(digest->hash_type);
+	return object->blocklength;
+}
+
+static unsigned
+nss_digest_result_size(PX_MD *pxmd)
+{
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+	const SECHashObject *object;
+
+	object = HASH_GetHashObject(digest->hash_type);
+	return object->length;
+}
+
+static void
+nss_digest_free(PX_MD *pxmd)
+{
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+	PRBool		free_ctx = PR_TRUE;
+
+	PK11_DestroyContext(digest->hash_context, free_ctx);
+	NSS_ShutdownContext(digest->context);
+}
+
+static void
+nss_digest_update(PX_MD *pxmd, const uint8 *data, unsigned dlen)
+{
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+
+	PK11_DigestOp(digest->hash_context, data, dlen);
+}
+
+static void
+nss_digest_reset(PX_MD *pxmd)
+{
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+
+	PK11_DigestBegin(digest->hash_context);
+}
+
+static void
+nss_digest_finish(PX_MD *pxmd, uint8 *dst)
+{
+	unsigned int outlen;
+	nss_digest *digest = (nss_digest *) pxmd->p.ptr;
+	const SECHashObject *object;
+
+	object = HASH_GetHashObject(digest->hash_type);
+	PK11_DigestFinal(digest->hash_context, dst, &outlen, object->length);
+}
+
+int
+px_find_digest(const char *name, PX_MD **res)
+{
+	PX_MD	   *pxmd;
+	NSSInitParameters params;
+	NSSInitContext *nss_context;
+	bool		found = false;
+	nss_digest *digest;
+	SECStatus	status;
+	SECOidData *hash;
+	HASH_HashType t;
+
+	/*
+	 * Initialize our own NSS context without a database backing it.
+	 */
+	memset(&params, 0, sizeof(params));
+	params.length = sizeof(params);
+	nss_context = NSS_InitContext("", "", "", "", &params,
+								  NSS_INIT_READONLY | NSS_INIT_NOCERTDB |
+								  NSS_INIT_NOMODDB | NSS_INIT_FORCEOPEN |
+								  NSS_INIT_NOROOTINIT | NSS_INIT_PK11RELOAD);
+
+	/*
+	 * There is no API function for looking up a digest algorithm from a name
+	 * string, but there is a publicly accessible array which can be scanned
+	 * for the name.
+	 */
+	for (t = HASH_AlgNULL + 1; t < HASH_AlgTOTAL; t++)
+	{
+		SECOidTag	hash_oid;
+		char	   *p;
+
+		hash_oid = nss_GetHashOidTagByHashType(t);
+
+		if (hash_oid == SEC_OID_UNKNOWN)
+			return PXE_NO_HASH;
+
+		hash = SECOID_FindOIDByTag(hash_oid);
+		if (pg_strcasecmp(hash->desc, name) == 0)
+		{
+			found = true;
+			break;
+		}
+
+		/*
+		 * NSS saves the algorithm names using SHA-xxx notation whereas
+		 * OpenSSL use SHAxxx. To make sure the user finds the requested
+		 * algorithm let's remove the dash and compare that spelling as well.
+		 */
+		if ((p = strchr(hash->desc, '-')) != NULL)
+		{
+			char		tmp[12];
+
+			memcpy(tmp, hash->desc, p - hash->desc);
+			memcpy(tmp + (p - hash->desc), p + 1, strlen(hash->desc) - (p - hash->desc) + 1);
+			if (pg_strcasecmp(tmp, name) == 0)
+			{
+				found = true;
+				break;
+			}
+		}
+	}
+
+	if (!found)
+		return PXE_NO_HASH;
+
+	digest = palloc(sizeof(*digest));
+
+	digest->context = nss_context;
+	digest->hash_context = PK11_CreateDigestContext(hash->offset);
+	digest->hash_type = t;
+	if (digest->hash_context == NULL)
+	{
+		pfree(digest);
+		return -1;
+	}
+
+	status = PK11_DigestBegin(digest->hash_context);
+	if (status != SECSuccess)
+	{
+		PK11_DestroyContext(digest->hash_context, PR_TRUE);
+		pfree(digest);
+		return -1;
+	}
+
+	pxmd = palloc(sizeof(*pxmd));
+	pxmd->result_size = nss_digest_result_size;
+	pxmd->block_size = nss_digest_block_size;
+	pxmd->reset = nss_digest_reset;
+	pxmd->update = nss_digest_update;
+	pxmd->finish = nss_digest_finish;
+	pxmd->free = nss_digest_free;
+	pxmd->p.ptr = (void *) digest;
+
+	*res = pxmd;
+
+	return 0;
+}
+
+static int
+bf_init(PX_Cipher *pxc, const uint8 *key, unsigned klen, const uint8 *iv)
+{
+	internal_cipher *cipher = (internal_cipher *) pxc->ptr;
+
+	blowfish_setkey(&cipher->context, key, klen);
+	if (iv)
+		blowfish_setiv(&cipher->context, iv);
+
+	return 0;
+}
+
+static int
+bf_encrypt(PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res)
+{
+	internal_cipher *cipher = (internal_cipher *) pxc->ptr;
+	uint8	   *buf;
+
+	if (dlen == 0)
+		return 0;
+
+	if (dlen & 7)
+		return PXE_NOTBLOCKSIZE;
+
+	buf = palloc(dlen);
+	memcpy(buf, data, dlen);
+
+	if (cipher->impl->mechanism.internal == BLOWFISH_ECB)
+		blowfish_encrypt_ecb(buf, dlen, &cipher->context);
+	else
+		blowfish_encrypt_cbc(buf, dlen, &cipher->context);
+
+	memcpy(res, buf, dlen);
+	pfree(buf);
+
+	return 0;
+}
+
+static int
+bf_decrypt(PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res)
+{
+	internal_cipher *cipher = (internal_cipher *) pxc->ptr;
+
+	if (dlen == 0)
+		return 0;
+
+	if (dlen & 7)
+		return PXE_NOTBLOCKSIZE;
+
+	memcpy(res, data, dlen);
+	if (cipher->impl->mechanism.internal == BLOWFISH_ECB)
+		blowfish_decrypt_ecb(res, dlen, &cipher->context);
+	else
+		blowfish_decrypt_cbc(res, dlen, &cipher->context);
+
+	return 0;
+}
+
+static void
+bf_free(PX_Cipher *pxc)
+{
+	internal_cipher *cipher = (internal_cipher *) pxc->ptr;
+
+	pfree(cipher);
+	pfree(pxc);
+}
+
+static int
+nss_symkey_blockcipher_init(PX_Cipher *pxc, const uint8 *key, unsigned klen,
+							const uint8 *iv)
+{
+	nss_cipher *cipher = (nss_cipher *) pxc->ptr;
+	SECItem		iv_item;
+	unsigned char *iv_item_data;
+	SECItem		key_item;
+	int			keylen;
+	PK11SlotInfo *slot;
+
+	if (cipher->impl->mechanism.nss == CKM_AES_CBC ||
+		cipher->impl->mechanism.nss == CKM_AES_ECB)
+	{
+		if (klen <= 128 / 8)
+			keylen = 128 / 8;
+		else if (klen <= 192 / 8)
+			keylen = 192 / 8;
+		else if (klen <= 256 / 8)
+			keylen = 256 / 8;
+		else
+			return PXE_CIPHER_INIT;
+	}
+	else
+		keylen = cipher->impl->keylen;
+
+	key_item.type = siBuffer;
+	key_item.data = (unsigned char *) key;
+	key_item.len = keylen;
+
+	/*
+	 * If hardware acceleration is configured in NSS one can theoretically get
+	 * a better slot by calling PK11_GetBestSlot() with the mechanism passed
+	 * to it. Unless there are complaints, using the simpler API will make
+	 * error handling easier though.
+	 */
+	slot = PK11_GetInternalSlot();
+	if (!slot)
+		return PXE_CIPHER_INIT;
+
+	/*
+	 * The key must be set up for the operation, and since we don't know at
+	 * this point whether we are asked to encrypt or decrypt we need to store
+	 * both versions.
+	 */
+	cipher->decrypt_key = PK11_ImportSymKey(slot, cipher->impl->mechanism.nss,
+											PK11_OriginUnwrap,
+											CKA_DECRYPT, &key_item,
+											NULL);
+	cipher->encrypt_key = PK11_ImportSymKey(slot, cipher->impl->mechanism.nss,
+											PK11_OriginUnwrap,
+											CKA_ENCRYPT, &key_item,
+											NULL);
+	PK11_FreeSlot(slot);
+
+	if (!cipher->decrypt_key || !cipher->encrypt_key)
+		return PXE_CIPHER_INIT;
+
+	if (iv)
+	{
+		iv_item.type = siBuffer;
+		iv_item.data = (unsigned char *) iv;
+		iv_item.len = nss_get_iv_size(pxc);
+	}
+	else
+	{
+		/*
+		 * The documentation states that either passing .data = 0; .len = 0;
+		 * in the iv_item, or NULL as iv_item, to PK11_ParamFromIV should be
+		 * done when IV is missing. That however leads to segfaults in the
+		 * library, the workaround that works in modern  library versions is
+		 * to pass in a keysized zeroed out IV.
+		 */
+		iv_item_data = palloc0(nss_get_iv_size(pxc));
+		iv_item.type = siBuffer;
+		iv_item.data = iv_item_data;
+		iv_item.len = nss_get_iv_size(pxc);
+	}
+
+	cipher->params = PK11_ParamFromIV(cipher->impl->mechanism.nss, &iv_item);
+
+	/* If we had to make a mock IV, free it once made into a param */
+	if (!iv)
+		pfree(iv_item_data);
+
+	if (cipher->params == NULL)
+		return PXE_CIPHER_INIT;
+
+	return 0;
+}
+
+static int
+nss_decrypt(PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res)
+{
+	nss_cipher *cipher = (nss_cipher *) pxc->ptr;
+	SECStatus	status;
+	int			outlen;
+
+	if (!cipher->crypt_context)
+	{
+		cipher->crypt_context =
+			PK11_CreateContextBySymKey(cipher->impl->mechanism.nss, CKA_DECRYPT,
+									   cipher->decrypt_key, cipher->params);
+	}
+
+	status = PK11_CipherOp(cipher->crypt_context, res, &outlen, dlen, data, dlen);
+	if (status != SECSuccess)
+		return PXE_DECRYPT_FAILED;
+
+	return 0;
+}
+
+static int
+nss_encrypt(PX_Cipher *pxc, const uint8 *data, unsigned dlen, uint8 *res)
+{
+	nss_cipher *cipher = (nss_cipher *) pxc->ptr;
+	SECStatus	status;
+	int			outlen;
+
+	if (!cipher->crypt_context)
+	{
+		cipher->crypt_context =
+			PK11_CreateContextBySymKey(cipher->impl->mechanism.nss, CKA_ENCRYPT,
+									   cipher->decrypt_key, cipher->params);
+	}
+
+	status = PK11_CipherOp(cipher->crypt_context, res, &outlen, dlen, data, dlen);
+
+	if (status != SECSuccess)
+		return PXE_DECRYPT_FAILED;
+
+	return 0;
+}
+
+static void
+nss_free(PX_Cipher *pxc)
+{
+	nss_cipher *cipher = pxc->ptr;
+	PRBool		free_ctx = PR_TRUE;
+
+	PK11_FreeSymKey(cipher->encrypt_key);
+	PK11_FreeSymKey(cipher->decrypt_key);
+	PK11_DestroyContext(cipher->crypt_context, free_ctx);
+	NSS_ShutdownContext(cipher->context);
+	pfree(cipher);
+
+	pfree(pxc);
+}
+
+static unsigned
+nss_get_block_size(PX_Cipher *pxc)
+{
+	nss_cipher *cipher = pxc->ptr;
+
+	return PK11_GetBlockSize(cipher->impl->mechanism.nss, NULL);
+}
+
+static unsigned
+nss_get_key_size(PX_Cipher *pxc)
+{
+	nss_cipher *cipher = pxc->ptr;
+
+	return cipher->impl->keylen;
+}
+
+static unsigned
+nss_get_iv_size(PX_Cipher *pxc)
+{
+	nss_cipher *cipher = pxc->ptr;
+
+	return PK11_GetIVLength(cipher->impl->mechanism.nss);
+}
+
+static unsigned
+bf_get_block_size(PX_Cipher *pxc)
+{
+	return 8;
+}
+
+static unsigned
+bf_get_key_size(PX_Cipher *pxc)
+{
+	return 448 / 8;
+}
+
+static unsigned
+bf_get_iv_size(PX_Cipher *pxc)
+{
+	return 8;
+}
+
+/*
+ * Cipher Implementations
+ */
+static const cipher_implementation nss_des_cbc = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_DES_CBC,
+	.keylen = 8,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_des_ecb = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_DES_ECB,
+	.keylen = 8,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_des3_cbc = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_DES3_CBC,
+	.keylen = 24,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_des3_ecb = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_DES3_ECB,
+	.keylen = 24,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_aes_cbc = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_AES_CBC,
+	.keylen = 32,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_aes_ecb = {
+	.init = nss_symkey_blockcipher_init,
+	.get_block_size = nss_get_block_size,
+	.get_key_size = nss_get_key_size,
+	.get_iv_size = nss_get_iv_size,
+	.encrypt = nss_encrypt,
+	.decrypt = nss_decrypt,
+	.free = nss_free,
+	.mechanism.nss = CKM_AES_ECB,
+	.keylen = 32,
+	.is_nss = true
+};
+
+static const cipher_implementation nss_bf_ecb = {
+	.init = bf_init,
+	.get_block_size = bf_get_block_size,
+	.get_key_size = bf_get_key_size,
+	.get_iv_size = bf_get_iv_size,
+	.encrypt = bf_encrypt,
+	.decrypt = bf_decrypt,
+	.free = bf_free,
+	.mechanism.internal = BLOWFISH_ECB,
+	.keylen = 56,
+	.is_nss = false
+};
+
+static const cipher_implementation nss_bf_cbc = {
+	.init = bf_init,
+	.get_block_size = bf_get_block_size,
+	.get_key_size = bf_get_key_size,
+	.get_iv_size = bf_get_iv_size,
+	.encrypt = bf_encrypt,
+	.decrypt = bf_decrypt,
+	.free = bf_free,
+	.mechanism.internal = BLOWFISH_CBC,
+	.keylen = 56,
+	.is_nss = false
+};
+
+/*
+ * Lookup table for finding the implementation based on a name. CAST5 as well
+ * as BLOWFISH are defined as cipher mechanisms in NSS but error out with
+ * SEC_ERROR_INVALID_ALGORITHM. Blowfish is implemented using the internal
+ * implementation while CAST5 isn't supported at all at this time,
+ */
+static const nss_cipher_ref nss_cipher_lookup[] = {
+	{"des", &nss_des_cbc},
+	{"des-cbc", &nss_des_cbc},
+	{"des-ecb", &nss_des_ecb},
+	{"des3-cbc", &nss_des3_cbc},
+	{"3des", &nss_des3_cbc},
+	{"3des-cbc", &nss_des3_cbc},
+	{"des3-ecb", &nss_des3_ecb},
+	{"3des-ecb", &nss_des3_ecb},
+	{"aes", &nss_aes_cbc},
+	{"aes-cbc", &nss_aes_cbc},
+	{"aes-ecb", &nss_aes_ecb},
+	{"rijndael", &nss_aes_cbc},
+	{"rijndael-cbc", &nss_aes_cbc},
+	{"rijndael-ecb", &nss_aes_ecb},
+	{"blowfish", &nss_bf_cbc},
+	{"blowfish-cbc", &nss_bf_cbc},
+	{"blowfish-ecb", &nss_bf_ecb},
+	{"bf", &nss_bf_cbc},
+	{"bf-cbc", &nss_bf_cbc},
+	{"bf-ecb", &nss_bf_ecb},
+	{NULL}
+};
+
+/*
+ * px_find_cipher
+ *
+ * Search for the requested cipher and see if there is support for it, and if
+ * so return an allocated object containing the playbook for how to encrypt
+ * and decrypt using the cipher.
+ */
+int
+px_find_cipher(const char *alias, PX_Cipher **res)
+{
+	const nss_cipher_ref *cipher_ref;
+	PX_Cipher  *px_cipher;
+	NSSInitParameters params;
+	NSSInitContext *nss_context;
+	nss_cipher *cipher;
+	internal_cipher *int_cipher;
+
+	for (cipher_ref = nss_cipher_lookup; cipher_ref->name; cipher_ref++)
+	{
+		if (strcmp(cipher_ref->name, alias) == 0)
+			break;
+	}
+
+	if (!cipher_ref->name)
+		return PXE_NO_CIPHER;
+
+	/*
+	 * Fill in the PX_Cipher to pass back to PX describing the operations to
+	 * perform in order to use the cipher.
+	 */
+	px_cipher = palloc(sizeof(*px_cipher));
+	px_cipher->block_size = cipher_ref->impl->get_block_size;
+	px_cipher->key_size = cipher_ref->impl->get_key_size;
+	px_cipher->iv_size = cipher_ref->impl->get_iv_size;
+	px_cipher->free = cipher_ref->impl->free;
+	px_cipher->init = cipher_ref->impl->init;
+	px_cipher->encrypt = cipher_ref->impl->encrypt;
+	px_cipher->decrypt = cipher_ref->impl->decrypt;
+
+	/*
+	 * Set the private data, which is different for NSS and internal ciphers
+	 */
+	if (cipher_ref->impl->is_nss)
+	{
+		/*
+		 * Initialize our own NSS context without a database backing it. At
+		 * some point we might want to allow users to use stored keys in the
+		 * database rather than passing them via SELECT encrypt(), and then
+		 * this need to be changed to open a user specified database.
+		 */
+		memset(&params, 0, sizeof(params));
+		params.length = sizeof(params);
+		nss_context = NSS_InitContext("", "", "", "", &params,
+									  NSS_INIT_READONLY | NSS_INIT_NOCERTDB |
+									  NSS_INIT_NOMODDB | NSS_INIT_FORCEOPEN |
+									  NSS_INIT_NOROOTINIT | NSS_INIT_PK11RELOAD);
+
+		/* nss_cipher is the private state struct for the operation */
+		cipher = palloc(sizeof(*cipher));
+		cipher->context = nss_context;
+		cipher->impl = cipher_ref->impl;
+		cipher->crypt_context = NULL;
+
+		px_cipher->ptr = cipher;
+	}
+	else
+	{
+		int_cipher = palloc0(sizeof(*int_cipher));
+
+		int_cipher->impl = cipher_ref->impl;
+		px_cipher->ptr = int_cipher;
+	}
+
+	*res = px_cipher;
+	return 0;
+}
diff --git a/doc/src/sgml/pgcrypto.sgml b/doc/src/sgml/pgcrypto.sgml
index b6bb23de0f..bf486f0c07 100644
--- a/doc/src/sgml/pgcrypto.sgml
+++ b/doc/src/sgml/pgcrypto.sgml
@@ -45,8 +45,9 @@ digest(data bytea, type text) returns bytea
     <literal>sha224</literal>, <literal>sha256</literal>,
     <literal>sha384</literal> and <literal>sha512</literal>.
     If <filename>pgcrypto</filename> was built with
-    <productname>OpenSSL</productname>, more algorithms are available, as
-    detailed in <xref linkend="pgcrypto-with-without-openssl"/>.
+    <productname>OpenSSL</productname> or <productname>NSS</productname>,
+    more algorithms are available, as
+    detailed in <xref linkend="pgcrypto-with-without-openssl-nss"/>.
    </para>
 
    <para>
@@ -764,7 +765,7 @@ pgp_sym_encrypt(data, psw, 'compress-algo=1, cipher-algo=aes256')
     Which cipher algorithm to use.
    </para>
 <literallayout>
-Values: bf, aes128, aes192, aes256 (OpenSSL-only: <literal>3des</literal>, <literal>cast5</literal>)
+Values: bf, aes128, aes192, aes256 (OpenSSL-only: <literal>3des</literal>, <literal>cast5</literal>; NSS-only: <literal>3des</literal>)
 Default: aes128
 Applies to: pgp_sym_encrypt, pgp_pub_encrypt
 </literallayout>
@@ -1153,8 +1154,8 @@ gen_random_uuid() returns uuid
    <para>
     <filename>pgcrypto</filename> configures itself according to the findings of the
     main PostgreSQL <literal>configure</literal> script.  The options that
-    affect it are <literal>--with-zlib</literal> and
-    <literal>--with-ssl=openssl</literal>.
+    affect it are <literal>--with-zlib</literal>,
+    <literal>--with-ssl=openssl</literal> and <literal>--with-ssl=nss</literal>.
    </para>
 
    <para>
@@ -1169,14 +1170,16 @@ gen_random_uuid() returns uuid
     BIGNUM functions.
    </para>
 
-   <table id="pgcrypto-with-without-openssl">
-    <title>Summary of Functionality with and without OpenSSL</title>
-    <tgroup cols="3">
+   <table id="pgcrypto-with-without-openssl-nss">
+    <title>Summary of Functionality with and without external cryptographic
+      library</title>
+    <tgroup cols="4">
      <thead>
       <row>
        <entry>Functionality</entry>
        <entry>Built-in</entry>
        <entry>With OpenSSL</entry>
+       <entry>With NSS</entry>
       </row>
      </thead>
      <tbody>
@@ -1184,51 +1187,67 @@ gen_random_uuid() returns uuid
        <entry>MD5</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>SHA1</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>SHA224/256/384/512</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>Other digest algorithms</entry>
        <entry>no</entry>
        <entry>yes (Note 1)</entry>
+       <entry>yes (Note 1)</entry>
       </row>
       <row>
        <entry>Blowfish</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>AES</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>DES/3DES/CAST5</entry>
        <entry>no</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
+      </row>
+      <row>
+       <entry>CAST5</entry>
+       <entry>no</entry>
+       <entry>yes</entry>
+       <entry>no</entry>
       </row>
       <row>
        <entry>Raw encryption</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>PGP Symmetric encryption</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
       <row>
        <entry>PGP Public-Key encryption</entry>
        <entry>yes</entry>
        <entry>yes</entry>
+       <entry>yes</entry>
       </row>
      </tbody>
     </tgroup>
@@ -1241,7 +1260,8 @@ gen_random_uuid() returns uuid
    <orderedlist>
     <listitem>
      <para>
-      Any digest algorithm <productname>OpenSSL</productname> supports
+      Any digest algorithm <productname>OpenSSL</productname> and
+      <productname>NSS</productname> supports
       is automatically picked up.
       This is not possible with ciphers, which need to be supported
       explicitly.
-- 
2.21.1 (Apple Git-122.3)

From 55fb70f3a3338d0c056ed682c1477a1ed7f1637b Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Mon, 8 Feb 2021 23:52:48 +0100
Subject: [PATCH v30 7/9] nss: Support NSS in sslinfo

Since sslinfo to a large extent use the be_tls_* API this mostly
disables functionality which currently is OpenSSL specific.
---
 contrib/sslinfo/sslinfo.c | 32 ++++++++++++++++++++++++++++++++
 doc/src/sgml/sslinfo.sgml | 12 +++++++++++-
 2 files changed, 43 insertions(+), 1 deletion(-)

diff --git a/contrib/sslinfo/sslinfo.c b/contrib/sslinfo/sslinfo.c
index 30cae0bb98..3aadd90aa6 100644
--- a/contrib/sslinfo/sslinfo.c
+++ b/contrib/sslinfo/sslinfo.c
@@ -9,9 +9,11 @@
 
 #include "postgres.h"
 
+#ifdef USE_OPENSSL
 #include <openssl/x509.h>
 #include <openssl/x509v3.h>
 #include <openssl/asn1.h>
+#endif
 
 #include "access/htup_details.h"
 #include "funcapi.h"
@@ -21,6 +23,7 @@
 
 PG_MODULE_MAGIC;
 
+#ifdef USE_OPENSSL
 static Datum X509_NAME_field_to_text(X509_NAME *name, text *fieldName);
 static Datum ASN1_STRING_to_text(ASN1_STRING *str);
 
@@ -31,6 +34,7 @@ typedef struct
 {
 	TupleDesc	tupdesc;
 } SSLExtensionInfoContext;
+#endif
 
 /*
  * Indicates whether current session uses SSL
@@ -131,6 +135,7 @@ ssl_client_serial(PG_FUNCTION_ARGS)
 }
 
 
+#ifdef USE_OPENSSL
 /*
  * Converts OpenSSL ASN1_STRING structure into text
  *
@@ -282,7 +287,23 @@ ssl_issuer_field(PG_FUNCTION_ARGS)
 	else
 		return result;
 }
+#endif							/* USE_OPENSSL */
 
+#ifdef USE_NSS
+PG_FUNCTION_INFO_V1(ssl_client_dn_field);
+Datum
+ssl_client_dn_field(PG_FUNCTION_ARGS)
+{
+	PG_RETURN_NULL();
+}
+
+PG_FUNCTION_INFO_V1(ssl_issuer_field);
+Datum
+ssl_issuer_field(PG_FUNCTION_ARGS)
+{
+	PG_RETURN_NULL();
+}
+#endif							/* USE_NSS */
 
 /*
  * Returns current client certificate subject as one string
@@ -338,6 +359,7 @@ ssl_issuer_dn(PG_FUNCTION_ARGS)
 }
 
 
+#ifdef USE_OPENSSL
 /*
  * Returns information about available SSL extensions.
  *
@@ -471,3 +493,13 @@ ssl_extension_info(PG_FUNCTION_ARGS)
 	/* All done */
 	SRF_RETURN_DONE(funcctx);
 }
+#endif							/* USE_OPENSSL */
+
+#ifdef USE_NSS
+PG_FUNCTION_INFO_V1(ssl_extension_info);
+Datum
+ssl_extension_info(PG_FUNCTION_ARGS)
+{
+	PG_RETURN_NULL();
+}
+#endif							/* USE_NSS */
diff --git a/doc/src/sgml/sslinfo.sgml b/doc/src/sgml/sslinfo.sgml
index 2a9c45a111..f3ae2fc3b8 100644
--- a/doc/src/sgml/sslinfo.sgml
+++ b/doc/src/sgml/sslinfo.sgml
@@ -22,7 +22,8 @@
 
  <para>
   This extension won't build at all unless the installation was
-  configured with <literal>--with-ssl=openssl</literal>.
+  configured with SSL support, such as <literal>--with-ssl=openssl</literal>
+  or <literal>--with-ssl=nss</literal>.
  </para>
 
  <sect2>
@@ -208,6 +209,9 @@ emailAddress
      the X.500 and X.509 standards, so you cannot just assign arbitrary
      meaning to them.
     </para>
+    <para>
+     This function is only available when using <productname>OpenSSL</productname>.
+    </para>
     </listitem>
    </varlistentry>
 
@@ -223,6 +227,9 @@ emailAddress
      Same as <function>ssl_client_dn_field</function>, but for the certificate issuer
      rather than the certificate subject.
     </para>
+    <para>
+     This function is only available when using <productname>OpenSSL</productname>.
+    </para>
     </listitem>
    </varlistentry>
 
@@ -238,6 +245,9 @@ emailAddress
      Provide information about extensions of client certificate: extension name,
      extension value, and if it is a critical extension.
     </para>
+    <para>
+     This function is only available when using <productname>OpenSSL</productname>.
+    </para>
     </listitem>
    </varlistentry>
   </variablelist>
-- 
2.21.1 (Apple Git-122.3)

From 33148e547591226881d109aa6e4a71dda2279c62 Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Mon, 8 Feb 2021 23:52:51 +0100
Subject: [PATCH v30 8/9] nss: Support NSS in cryptohash

This adds support for using libnss as a crypto backend for the built-
in cryptohash support. Much of this code is similar to the pgcrypto
support.
---
 src/common/cryptohash_nss.c | 264 ++++++++++++++++++++++++++++++++++++
 1 file changed, 264 insertions(+)
 create mode 100644 src/common/cryptohash_nss.c

diff --git a/src/common/cryptohash_nss.c b/src/common/cryptohash_nss.c
new file mode 100644
index 0000000000..59ba9c1697
--- /dev/null
+++ b/src/common/cryptohash_nss.c
@@ -0,0 +1,264 @@
+/*-------------------------------------------------------------------------
+ *
+ * cryptohash_nss.c
+ *	  Set of wrapper routines on top of NSS to support cryptographic
+ *	  hash functions.
+ *
+ * This should only be used if code is compiled with NSS support.
+ *
+ * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ *		  src/common/cryptohash_nss.c
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#ifndef FRONTEND
+#include "postgres.h"
+#else
+#include "postgres_fe.h"
+#endif
+
+#include "common/nss.h"
+
+#include <nss/nss.h>
+#include <nss/hasht.h>
+#include <nss/pk11func.h>
+#include <nss/pk11pub.h>
+#include <nss/secitem.h>
+#include <nss/sechash.h>
+#include <nss/secoid.h>
+#include <nss/secerr.h>
+
+#include "common/cryptohash.h"
+#ifndef FRONTEND
+#include "utils/memutils.h"
+#include "utils/resowner.h"
+#include "utils/resowner_private.h"
+#endif
+
+/*
+ * In the backend, use an allocation in TopMemoryContext to count for
+ * resowner cleanup handling.  In the frontend, use malloc to be able
+ * to return a failure status back to the caller.
+ */
+#ifndef FRONTEND
+#define ALLOC(size) MemoryContextAlloc(TopMemoryContext, size)
+#define FREE(ptr) pfree(ptr)
+#else
+#define ALLOC(size) malloc(size)
+#define FREE(ptr) free(ptr)
+#endif
+
+/*
+ * Internal pg_cryptohash_ctx structure.
+ */
+struct pg_cryptohash_ctx
+{
+	pg_cryptohash_type type;
+
+	PK11Context *pk11_context;
+	HASH_HashType hash_type;
+
+#ifndef FRONTEND
+	ResourceOwner resowner;
+#endif
+};
+
+/*
+ * pg_cryptohash_create
+ *
+ * Create and allocate a new hash context. Returns NULL on failure in the
+ * frontend, and raise error without returning in the backend.
+ */
+pg_cryptohash_ctx *
+pg_cryptohash_create(pg_cryptohash_type type)
+{
+	NSSInitParameters params;
+	pg_cryptohash_ctx *ctx;
+	SECOidData *hash;
+	SECStatus status;
+
+#ifndef FRONTEND
+	/*
+	 * Make sure that the resource owner has space to remember this reference.
+	 * This can error out with "out of memory", so do this before any other
+	 * allocation to avoid leaking.
+	 */
+	ResourceOwnerEnlargeCryptoHash(CurrentResourceOwner);
+#endif
+
+	ctx = ALLOC(sizeof(pg_cryptohash_ctx));
+
+	if (!ctx)
+		goto error;
+
+	switch(type)
+	{
+		case PG_SHA1:
+			ctx->hash_type = SEC_OID_SHA1;
+			break;
+		case PG_MD5:
+			ctx->hash_type = SEC_OID_MD5;
+			break;
+		case PG_SHA224:
+			ctx->hash_type = SEC_OID_SHA224;
+			break;
+		case PG_SHA256:
+			ctx->hash_type = SEC_OID_SHA256;
+			break;
+		case PG_SHA384:
+			ctx->hash_type = SEC_OID_SHA384;
+			break;
+		case PG_SHA512:
+			ctx->hash_type = SEC_OID_SHA512;
+			break;
+	}
+
+	/*
+	 * Initialize our own NSS context without a database backing it.
+	 */
+	memset(&params, 0, sizeof(params));
+	params.length = sizeof(params);
+	status = NSS_NoDB_Init(".");
+	if (status != SECSuccess)
+	{
+		explicit_bzero(ctx, sizeof(pg_cryptohash_ctx));
+		FREE(ctx);
+		goto error;
+	}
+
+	ctx->type = type;
+	hash = SECOID_FindOIDByTag(ctx->hash_type);
+	ctx->pk11_context = PK11_CreateDigestContext(hash->offset);
+	if (!ctx->pk11_context)
+	{
+		explicit_bzero(ctx, sizeof(pg_cryptohash_ctx));
+		FREE(ctx);
+		goto error;
+	}
+
+#ifndef FRONTEND
+	ctx->resowner = CurrentResourceOwner;
+	ResourceOwnerRememberCryptoHash(CurrentResourceOwner,
+									PointerGetDatum(ctx));
+#endif
+
+	return ctx;
+
+error:
+#ifndef FRONTEND
+	ereport(ERROR,
+			(errcode(ERRCODE_OUT_OF_MEMORY),
+			 errmsg("out of memory")));
+#endif
+	return NULL;
+}
+
+/*
+ * pg_cryptohash_init
+ *			Initialize the passed hash context
+ *
+ * Returns 0 on success, -1 on failure.
+ */
+int
+pg_cryptohash_init(pg_cryptohash_ctx *ctx)
+{
+	SECStatus		status;
+
+	status = PK11_DigestBegin(ctx->pk11_context);
+
+	if (status != SECSuccess)
+		return -1;
+	return 0;
+}
+
+/*
+ * pg_cryptohash_update
+ *
+ * Update a hash context.  Returns 0 on success, -1 on failure.
+ */
+int
+pg_cryptohash_update(pg_cryptohash_ctx *ctx, const uint8 *data, size_t len)
+{
+	SECStatus	status;
+
+	if (ctx == NULL)
+		return -1;
+
+	status = PK11_DigestOp(ctx->pk11_context, data, len);
+	if (status != SECSuccess)
+		return -1;
+
+	return 0;
+}
+
+/*
+ * pg_cryptohash_final
+ *
+ * Finalize a hash context.  Returns 0 on success, -1 on failure.
+ */
+int
+pg_cryptohash_final(pg_cryptohash_ctx *ctx, uint8 *dest, size_t len)
+{
+	SECStatus	status;
+	unsigned int outlen;
+
+	switch (ctx->type)
+	{
+		case PG_MD5:
+			if (len < MD5_LENGTH)
+				return -1;
+			break;
+		case PG_SHA1:
+			if (len < SHA1_LENGTH)
+				return -1;
+			break;
+		case PG_SHA224:
+			if (len < SHA224_LENGTH)
+				return -1;
+			break;
+		case PG_SHA256:
+			if (len < SHA256_LENGTH)
+				return -1;
+			break;
+		case PG_SHA384:
+			if (len < SHA384_LENGTH)
+				return -1;
+			break;
+		case PG_SHA512:
+			if (len < SHA512_LENGTH)
+				return -1;
+			break;
+	}
+
+	status = PK11_DigestFinal(ctx->pk11_context, dest, &outlen, len);
+
+	if (status != SECSuccess)
+		return -1;
+
+	return 0;
+}
+
+/*
+ * pg_cryptohash_free
+ *
+ * Free a hash context and the associated NSS context.
+ */
+void
+pg_cryptohash_free(pg_cryptohash_ctx *ctx)
+{
+	PRBool		free_context = PR_TRUE;
+
+	if (!ctx)
+		return;
+
+	PK11_DestroyContext(ctx->pk11_context, free_context);
+#ifndef FRONTEND
+	ResourceOwnerForgetCryptoHash(ctx->resowner, PointerGetDatum(ctx));
+#endif
+	explicit_bzero(ctx, sizeof(pg_cryptohash_ctx));
+	FREE(ctx);
+}
-- 
2.21.1 (Apple Git-122.3)

From 96f38247b460a62e601d9d650d1336a46dc041c0 Mon Sep 17 00:00:00 2001
From: Daniel Gustafsson <daniel@yesql.se>
Date: Mon, 8 Feb 2021 23:52:55 +0100
Subject: [PATCH v30 9/9] nss: Build infrastructure

Finally this adds the infrastructure to build a postgres installation
with libnss support.
---
 configure                     | 294 +++++++++++++++++++++++++++++++++-
 configure.ac                  |  31 +++-
 src/backend/libpq/Makefile    |   4 +
 src/common/Makefile           |   6 +
 src/include/pg_config.h.in    |  12 ++
 src/interfaces/libpq/Makefile |   5 +
 src/tools/msvc/Install.pm     |   3 +-
 src/tools/msvc/Mkvcbuild.pm   |  39 ++++-
 src/tools/msvc/Solution.pm    |  26 +++
 9 files changed, 408 insertions(+), 12 deletions(-)

diff --git a/configure b/configure
index ce9ea36999..143726c79c 100755
--- a/configure
+++ b/configure
@@ -654,6 +654,8 @@ UUID_LIBS
 LDAP_LIBS_BE
 LDAP_LIBS_FE
 with_ssl
+NSPR_CONFIG
+NSS_CONFIG
 PTHREAD_CFLAGS
 PTHREAD_LIBS
 PTHREAD_CC
@@ -1570,7 +1572,7 @@ Optional Packages:
                           use system time zone data in DIR
   --without-zlib          do not use Zlib
   --with-gnu-ld           assume the C compiler uses GNU ld [default=no]
-  --with-ssl=LIB          use LIB for SSL/TLS support (openssl)
+  --with-ssl=LIB          use LIB for SSL/TLS support (openssl, nss)
   --with-openssl          obsolete spelling of --with-ssl=openssl
 
 Some influential environment variables:
@@ -12462,8 +12464,274 @@ done
 
 $as_echo "#define USE_OPENSSL 1" >>confdefs.h
 
+elif test "$with_ssl" = nss ; then
+  # TODO: fallback in case nss-config/nspr-config aren't found.
+  if test -z "$NSS_CONFIG"; then
+  for ac_prog in nss-config
+do
+  # Extract the first word of "$ac_prog", so it can be a program name with args.
+set dummy $ac_prog; ac_word=$2
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
+$as_echo_n "checking for $ac_word... " >&6; }
+if ${ac_cv_path_NSS_CONFIG+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  case $NSS_CONFIG in
+  [\\/]* | ?:[\\/]*)
+  ac_cv_path_NSS_CONFIG="$NSS_CONFIG" # Let the user override the test with a path.
+  ;;
+  *)
+  as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH
+do
+  IFS=$as_save_IFS
+  test -z "$as_dir" && as_dir=.
+    for ac_exec_ext in '' $ac_executable_extensions; do
+  if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
+    ac_cv_path_NSS_CONFIG="$as_dir/$ac_word$ac_exec_ext"
+    $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
+    break 2
+  fi
+done
+  done
+IFS=$as_save_IFS
+
+  ;;
+esac
+fi
+NSS_CONFIG=$ac_cv_path_NSS_CONFIG
+if test -n "$NSS_CONFIG"; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $NSS_CONFIG" >&5
+$as_echo "$NSS_CONFIG" >&6; }
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+fi
+
+
+  test -n "$NSS_CONFIG" && break
+done
+
+else
+  # Report the value of NSS_CONFIG in configure's output in all cases.
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for NSS_CONFIG" >&5
+$as_echo_n "checking for NSS_CONFIG... " >&6; }
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $NSS_CONFIG" >&5
+$as_echo "$NSS_CONFIG" >&6; }
+fi
+
+  if test -z "$NSPR_CONFIG"; then
+  for ac_prog in nspr-config
+do
+  # Extract the first word of "$ac_prog", so it can be a program name with args.
+set dummy $ac_prog; ac_word=$2
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
+$as_echo_n "checking for $ac_word... " >&6; }
+if ${ac_cv_path_NSPR_CONFIG+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  case $NSPR_CONFIG in
+  [\\/]* | ?:[\\/]*)
+  ac_cv_path_NSPR_CONFIG="$NSPR_CONFIG" # Let the user override the test with a path.
+  ;;
+  *)
+  as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH
+do
+  IFS=$as_save_IFS
+  test -z "$as_dir" && as_dir=.
+    for ac_exec_ext in '' $ac_executable_extensions; do
+  if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
+    ac_cv_path_NSPR_CONFIG="$as_dir/$ac_word$ac_exec_ext"
+    $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
+    break 2
+  fi
+done
+  done
+IFS=$as_save_IFS
+
+  ;;
+esac
+fi
+NSPR_CONFIG=$ac_cv_path_NSPR_CONFIG
+if test -n "$NSPR_CONFIG"; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $NSPR_CONFIG" >&5
+$as_echo "$NSPR_CONFIG" >&6; }
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+fi
+
+
+  test -n "$NSPR_CONFIG" && break
+done
+
+else
+  # Report the value of NSPR_CONFIG in configure's output in all cases.
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for NSPR_CONFIG" >&5
+$as_echo_n "checking for NSPR_CONFIG... " >&6; }
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $NSPR_CONFIG" >&5
+$as_echo "$NSPR_CONFIG" >&6; }
+fi
+
+  if test -n "$NSS_CONFIG"; then
+    NSS_LIBS=`$NSS_CONFIG --libs`
+	NSS_CFLAGS=`$NSS_CONFIG --cflags`
+  fi
+  if test -n "$NSPR_CONFIG"; then
+	NSPR_LIBS=`$NSPR_CONFIG --libs`
+	NSPR_CFLAGS=`$NSPR_CONFIG --cflags`
+  fi
+
+  LDFLAGS="$LDFLAGS $NSS_LIBS $NSPR_LIBS"
+  CFLAGS="$CFLAGS $NSS_CFLAGS $NSPR_CFLAGS"
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for NSS_InitContext in -lnss3" >&5
+$as_echo_n "checking for NSS_InitContext in -lnss3... " >&6; }
+if ${ac_cv_lib_nss3_NSS_InitContext+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lnss3  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char NSS_InitContext ();
+int
+main ()
+{
+return NSS_InitContext ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_lib_nss3_NSS_InitContext=yes
+else
+  ac_cv_lib_nss3_NSS_InitContext=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_nss3_NSS_InitContext" >&5
+$as_echo "$ac_cv_lib_nss3_NSS_InitContext" >&6; }
+if test "x$ac_cv_lib_nss3_NSS_InitContext" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_LIBNSS3 1
+_ACEOF
+
+  LIBS="-lnss3 $LIBS"
+
+else
+  as_fn_error $? "library 'nss3' is required for NSS" "$LINENO" 5
+fi
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for PR_GetDefaultIOMethods in -lnspr4" >&5
+$as_echo_n "checking for PR_GetDefaultIOMethods in -lnspr4... " >&6; }
+if ${ac_cv_lib_nspr4_PR_GetDefaultIOMethods+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lnspr4  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char PR_GetDefaultIOMethods ();
+int
+main ()
+{
+return PR_GetDefaultIOMethods ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_lib_nspr4_PR_GetDefaultIOMethods=yes
+else
+  ac_cv_lib_nspr4_PR_GetDefaultIOMethods=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_nspr4_PR_GetDefaultIOMethods" >&5
+$as_echo "$ac_cv_lib_nspr4_PR_GetDefaultIOMethods" >&6; }
+if test "x$ac_cv_lib_nspr4_PR_GetDefaultIOMethods" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_LIBNSPR4 1
+_ACEOF
+
+  LIBS="-lnspr4 $LIBS"
+
+else
+  as_fn_error $? "library 'nspr4' is required for NSS" "$LINENO" 5
+fi
+
+  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for SSL_GetImplementedCiphers in -lssl3" >&5
+$as_echo_n "checking for SSL_GetImplementedCiphers in -lssl3... " >&6; }
+if ${ac_cv_lib_ssl3_SSL_GetImplementedCiphers+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  ac_check_lib_save_LIBS=$LIBS
+LIBS="-lssl3  $LIBS"
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+
+/* Override any GCC internal prototype to avoid an error.
+   Use char because int might match the return type of a GCC
+   builtin and then its argument prototype would still apply.  */
+#ifdef __cplusplus
+extern "C"
+#endif
+char SSL_GetImplementedCiphers ();
+int
+main ()
+{
+return SSL_GetImplementedCiphers ();
+  ;
+  return 0;
+}
+_ACEOF
+if ac_fn_c_try_link "$LINENO"; then :
+  ac_cv_lib_ssl3_SSL_GetImplementedCiphers=yes
+else
+  ac_cv_lib_ssl3_SSL_GetImplementedCiphers=no
+fi
+rm -f core conftest.err conftest.$ac_objext \
+    conftest$ac_exeext conftest.$ac_ext
+LIBS=$ac_check_lib_save_LIBS
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_lib_ssl3_SSL_GetImplementedCiphers" >&5
+$as_echo "$ac_cv_lib_ssl3_SSL_GetImplementedCiphers" >&6; }
+if test "x$ac_cv_lib_ssl3_SSL_GetImplementedCiphers" = xyes; then :
+  cat >>confdefs.h <<_ACEOF
+#define HAVE_LIBSSL3 1
+_ACEOF
+
+  LIBS="-lssl3 $LIBS"
+
+else
+  as_fn_error $? "library 'ssl3' is required for NSS" "$LINENO" 5
+fi
+
+
+$as_echo "#define USE_NSS 1" >>confdefs.h
+
 elif test "$with_ssl" != no ; then
-  as_fn_error $? "--with-ssl must specify openssl" "$LINENO" 5
+  as_fn_error $? "--with-ssl must specify one of openssl or nss" "$LINENO" 5
 fi
 
 
@@ -13369,6 +13637,23 @@ else
 fi
 
 
+elif test "$with_ssl" = nss ; then
+  ac_fn_c_check_header_mongrel "$LINENO" "nss/ssl.h" "ac_cv_header_nss_ssl_h" "$ac_includes_default"
+if test "x$ac_cv_header_nss_ssl_h" = xyes; then :
+
+else
+  as_fn_error $? "header file <nss/ssl.h> is required for NSS" "$LINENO" 5
+fi
+
+
+  ac_fn_c_check_header_mongrel "$LINENO" "nss/nss.h" "ac_cv_header_nss_nss_h" "$ac_includes_default"
+if test "x$ac_cv_header_nss_nss_h" = xyes; then :
+
+else
+  as_fn_error $? "header file <nss/nss.h> is required for NSS" "$LINENO" 5
+fi
+
+
 fi
 
 if test "$with_pam" = yes ; then
@@ -18131,6 +18416,9 @@ $as_echo_n "checking which random number source to use... " >&6; }
 if test x"$with_ssl" = x"openssl" ; then
   { $as_echo "$as_me:${as_lineno-$LINENO}: result: OpenSSL" >&5
 $as_echo "OpenSSL" >&6; }
+elif test x"$with_ssl" = x"nss" ; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: NSS" >&5
+$as_echo "NSS" >&6; }
 elif test x"$PORTNAME" = x"win32" ; then
   { $as_echo "$as_me:${as_lineno-$LINENO}: result: Windows native" >&5
 $as_echo "Windows native" >&6; }
@@ -18160,7 +18448,7 @@ fi
   if test x"$ac_cv_file__dev_urandom" = x"no" ; then
     as_fn_error $? "
 no source of strong random numbers was found
-PostgreSQL can use OpenSSL, native Windows API or /dev/urandom as a source of random numbers." "$LINENO" 5
+PostgreSQL can use OpenSSL, NSS, native Windows API or /dev/urandom as a source of random numbers." "$LINENO" 5
   fi
 fi
 
diff --git a/configure.ac b/configure.ac
index f54f65febe..5ec8970588 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1201,7 +1201,7 @@ fi
 #
 # There is currently only one supported SSL/TLS library: OpenSSL.
 #
-PGAC_ARG_REQ(with, ssl, [LIB], [use LIB for SSL/TLS support (openssl)])
+PGAC_ARG_REQ(with, ssl, [LIB], [use LIB for SSL/TLS support (openssl, nss)])
 if test x"$with_ssl" = x"" ; then
   with_ssl=no
 fi
@@ -1235,8 +1235,28 @@ if test "$with_ssl" = openssl ; then
   # function was removed.
   AC_CHECK_FUNCS([CRYPTO_lock])
   AC_DEFINE([USE_OPENSSL], 1, [Define to 1 to build with OpenSSL support. (--with-ssl=openssl)])
+elif test "$with_ssl" = nss ; then
+  # TODO: fallback in case nss-config/nspr-config aren't found.
+  PGAC_PATH_PROGS(NSS_CONFIG, nss-config)
+  PGAC_PATH_PROGS(NSPR_CONFIG, nspr-config)
+  if test -n "$NSS_CONFIG"; then
+    NSS_LIBS=`$NSS_CONFIG --libs`
+	NSS_CFLAGS=`$NSS_CONFIG --cflags`
+  fi
+  if test -n "$NSPR_CONFIG"; then
+	NSPR_LIBS=`$NSPR_CONFIG --libs`
+	NSPR_CFLAGS=`$NSPR_CONFIG --cflags`
+  fi
+
+  LDFLAGS="$LDFLAGS $NSS_LIBS $NSPR_LIBS"
+  CFLAGS="$CFLAGS $NSS_CFLAGS $NSPR_CFLAGS"
+
+  AC_CHECK_LIB(nss3, NSS_InitContext, [], [AC_MSG_ERROR([library 'nss3' is required for NSS])])
+  AC_CHECK_LIB(nspr4, PR_GetDefaultIOMethods, [], [AC_MSG_ERROR([library 'nspr4' is required for NSS])])
+  AC_CHECK_LIB(ssl3, SSL_GetImplementedCiphers, [], [AC_MSG_ERROR([library 'ssl3' is required for NSS])])
+  AC_DEFINE([USE_NSS], 1, [Define to 1 if you have NSS support,])
 elif test "$with_ssl" != no ; then
-  AC_MSG_ERROR([--with-ssl must specify openssl])
+  AC_MSG_ERROR([--with-ssl must specify one of openssl or nss])
 fi
 AC_SUBST(with_ssl)
 
@@ -1414,6 +1434,9 @@ fi
 if test "$with_ssl" = openssl ; then
   AC_CHECK_HEADER(openssl/ssl.h, [], [AC_MSG_ERROR([header file <openssl/ssl.h> is required for OpenSSL])])
   AC_CHECK_HEADER(openssl/err.h, [], [AC_MSG_ERROR([header file <openssl/err.h> is required for OpenSSL])])
+elif test "$with_ssl" = nss ; then
+  AC_CHECK_HEADER(nss/ssl.h, [], [AC_MSG_ERROR([header file <nss/ssl.h> is required for NSS])])
+  AC_CHECK_HEADER(nss/nss.h, [], [AC_MSG_ERROR([header file <nss/nss.h> is required for NSS])])
 fi
 
 if test "$with_pam" = yes ; then
@@ -2170,6 +2193,8 @@ fi
 AC_MSG_CHECKING([which random number source to use])
 if test x"$with_ssl" = x"openssl" ; then
   AC_MSG_RESULT([OpenSSL])
+elif test x"$with_ssl" = x"nss" ; then
+  AC_MSG_RESULT([NSS])
 elif test x"$PORTNAME" = x"win32" ; then
   AC_MSG_RESULT([Windows native])
 else
@@ -2179,7 +2204,7 @@ else
   if test x"$ac_cv_file__dev_urandom" = x"no" ; then
     AC_MSG_ERROR([
 no source of strong random numbers was found
-PostgreSQL can use OpenSSL, native Windows API or /dev/urandom as a source of random numbers.])
+PostgreSQL can use OpenSSL, NSS, native Windows API or /dev/urandom as a source of random numbers.])
   fi
 fi
 
diff --git a/src/backend/libpq/Makefile b/src/backend/libpq/Makefile
index 8d1d16b0fc..045d2c2f6b 100644
--- a/src/backend/libpq/Makefile
+++ b/src/backend/libpq/Makefile
@@ -30,6 +30,10 @@ OBJS = \
 
 ifeq ($(with_ssl),openssl)
 OBJS += be-secure-openssl.o
+else
+ifeq ($(with_ssl),nss)
+OBJS += be-secure-nss.o
+endif
 endif
 
 ifeq ($(with_gssapi),yes)
diff --git a/src/common/Makefile b/src/common/Makefile
index 5422579a6a..57d44080b4 100644
--- a/src/common/Makefile
+++ b/src/common/Makefile
@@ -85,12 +85,18 @@ OBJS_COMMON += \
 	protocol_openssl.o \
 	cryptohash_openssl.o
 else
+ifeq ($(with_ssl),nss)
+OBJS_COMMON += \
+	cipher_nss.o \
+	cryptohash_nss.o
+else
 OBJS_COMMON += \
 	cryptohash.o \
 	md5.o \
 	sha1.o \
 	sha2.o
 endif
+endif
 
 # A few files are currently only built for frontend, not server
 # (Mkvcbuild.pm has a copy of this list, too).  logging.c is excluded
diff --git a/src/include/pg_config.h.in b/src/include/pg_config.h.in
index 04dc330119..474cc2655c 100644
--- a/src/include/pg_config.h.in
+++ b/src/include/pg_config.h.in
@@ -322,6 +322,12 @@
 /* Define to 1 if you have the `m' library (-lm). */
 #undef HAVE_LIBM
 
+/* Define to 1 if you have the `nspr4' library (-lnspr4). */
+#undef HAVE_LIBNSPR4
+
+/* Define to 1 if you have the `nss3' library (-lnss3). */
+#undef HAVE_LIBNSS3
+
 /* Define to 1 if you have the `pam' library (-lpam). */
 #undef HAVE_LIBPAM
 
@@ -334,6 +340,9 @@
 /* Define to 1 if you have the `ssl' library (-lssl). */
 #undef HAVE_LIBSSL
 
+/* Define to 1 if you have the `ssl3' library (-lssl3). */
+#undef HAVE_LIBSSL3
+
 /* Define to 1 if you have the `wldap32' library (-lwldap32). */
 #undef HAVE_LIBWLDAP32
 
@@ -899,6 +908,9 @@
 /* Define to select named POSIX semaphores. */
 #undef USE_NAMED_POSIX_SEMAPHORES
 
+/* Define to 1 if you have NSS support, */
+#undef USE_NSS
+
 /* Define to 1 to build with OpenSSL support. (--with-ssl=openssl) */
 #undef USE_OPENSSL
 
diff --git a/src/interfaces/libpq/Makefile b/src/interfaces/libpq/Makefile
index f74677eaf9..e10d8bef42 100644
--- a/src/interfaces/libpq/Makefile
+++ b/src/interfaces/libpq/Makefile
@@ -56,6 +56,11 @@ OBJS += \
 	fe-secure-openssl.o
 endif
 
+ifeq ($(with_ssl), nss)
+OBJS += \
+	fe-secure-nss.o
+endif
+
 ifeq ($(with_gssapi),yes)
 OBJS += \
 	fe-gssapi-common.o \
diff --git a/src/tools/msvc/Install.pm b/src/tools/msvc/Install.pm
index ea3af48777..afe72a7e97 100644
--- a/src/tools/msvc/Install.pm
+++ b/src/tools/msvc/Install.pm
@@ -438,7 +438,8 @@ sub CopyContribFiles
 		{
 			# These configuration-based exclusions must match vcregress.pl
 			next if ($d eq "uuid-ossp"  && !defined($config->{uuid}));
-			next if ($d eq "sslinfo"    && !defined($config->{openssl}));
+			next if ($d eq "sslinfo"    && !defined($config->{openssl})
+			  && !defined($config->{nss}));
 			next if ($d eq "xml2"       && !defined($config->{xml}));
 			next if ($d =~ /_plperl$/   && !defined($config->{perl}));
 			next if ($d =~ /_plpython$/ && !defined($config->{python}));
diff --git a/src/tools/msvc/Mkvcbuild.pm b/src/tools/msvc/Mkvcbuild.pm
index 49614106dc..53b5a71726 100644
--- a/src/tools/msvc/Mkvcbuild.pm
+++ b/src/tools/msvc/Mkvcbuild.pm
@@ -132,6 +132,11 @@ sub mkvcbuild
 		push(@pgcommonallfiles, 'cryptohash_openssl.c');
 		push(@pgcommonallfiles, 'protocol_openssl.c');
 	}
+	elsif ($solution->{options}->{nss})
+	{
+		push(@pgcommonallfiles, 'cryptohash_nss.c');
+		push(@pgcommonallfiles, 'cipher_nss.c');
+	}
 	else
 	{
 		push(@pgcommonallfiles, 'cryptohash.c');
@@ -196,12 +201,19 @@ sub mkvcbuild
 	$postgres->FullExportDLL('postgres.lib');
 
 	# The OBJS scraper doesn't know about ifdefs, so remove appropriate files
-	# if building without OpenSSL.
-	if (!$solution->{options}->{openssl})
+	# if building without various options.
+	if (!$solution->{options}->{openssl} && !$solution->{options}->{nss})
 	{
 		$postgres->RemoveFile('src/backend/libpq/be-secure-common.c');
+	}
+	if (!$solution->{options}->{openssl})
+	{
 		$postgres->RemoveFile('src/backend/libpq/be-secure-openssl.c');
 	}
+	if (!$solution->{options}->{nss})
+	{
+		$postgres->RemoveFile('src/backend/libpq/be-secure-nss.c');
+	}
 	if (!$solution->{options}->{gss})
 	{
 		$postgres->RemoveFile('src/backend/libpq/be-gssapi-common.c');
@@ -259,12 +271,19 @@ sub mkvcbuild
 	$libpq->AddReference($libpgcommon, $libpgport);
 
 	# The OBJS scraper doesn't know about ifdefs, so remove appropriate files
-	# if building without OpenSSL.
-	if (!$solution->{options}->{openssl})
+	# if building without various options
+	if (!$solution->{options}->{openssl} && !$solution->{options}->{nss})
 	{
 		$libpq->RemoveFile('src/interfaces/libpq/fe-secure-common.c');
+	}
+	if (!$solution->{options}->{openssl})
+	{
 		$libpq->RemoveFile('src/interfaces/libpq/fe-secure-openssl.c');
 	}
+	if (!$solution->{options}->{nss})
+	{
+		$libpq->RemoveFile('src/interfaces/libpq/fe-secure-nss.c');
+	}
 	if (!$solution->{options}->{gss})
 	{
 		$libpq->RemoveFile('src/interfaces/libpq/fe-gssapi-common.c');
@@ -432,9 +451,14 @@ sub mkvcbuild
 		push @contrib_excludes, 'xml2';
 	}
 
+	if (!$solution->{options}->{openssl} && !$solution->{options}->{nss})
+	{
+		push @contrib_excludes, 'sslinfo';
+	}
+
 	if (!$solution->{options}->{openssl})
 	{
-		push @contrib_excludes, 'sslinfo', 'ssl_passphrase_callback';
+		push @contrib_excludes, 'ssl_passphrase_callback';
 	}
 
 	if (!$solution->{options}->{uuid})
@@ -464,6 +488,11 @@ sub mkvcbuild
 		$pgcrypto->AddFiles('contrib/pgcrypto', 'openssl.c',
 			'pgp-mpi-openssl.c');
 	}
+	elsif ($solution->{options}->{nss})
+	{
+		$pgcrypto->AddFiles('contrib/pgcrypto', 'nss.c',
+			'pgp-mpi-internal.c', 'imath.c', 'blf.c');
+	}
 	else
 	{
 		$pgcrypto->AddFiles(
diff --git a/src/tools/msvc/Solution.pm b/src/tools/msvc/Solution.pm
index 69b08591cc..f175d7aa24 100644
--- a/src/tools/msvc/Solution.pm
+++ b/src/tools/msvc/Solution.pm
@@ -299,10 +299,13 @@ sub GenerateFiles
 		HAVE_LIBLDAP                                => undef,
 		HAVE_LIBLDAP_R                              => undef,
 		HAVE_LIBM                                   => undef,
+		HAVE_LIBNSPR4								=> undef,
+		HAVE_LIBNSS3								=> undef,
 		HAVE_LIBPAM                                 => undef,
 		HAVE_LIBREADLINE                            => undef,
 		HAVE_LIBSELINUX                             => undef,
 		HAVE_LIBSSL                                 => undef,
+		HAVE_LIBSSL3								=> undef,
 		HAVE_LIBWLDAP32                             => undef,
 		HAVE_LIBXML2                                => undef,
 		HAVE_LIBXSLT                                => undef,
@@ -488,6 +491,7 @@ sub GenerateFiles
 		USE_LLVM                   => undef,
 		USE_NAMED_POSIX_SEMAPHORES => undef,
 		USE_OPENSSL                => undef,
+		USE_NSS                    => undef,
 		USE_PAM                    => undef,
 		USE_SLICING_BY_8_CRC32C    => undef,
 		USE_SSE42_CRC32C           => undef,
@@ -540,6 +544,13 @@ sub GenerateFiles
 			$define{HAVE_OPENSSL_INIT_SSL}      = 1;
 		}
 	}
+	if ($self->{options}->{nss})
+	{
+		$define{USE_NSS} = 1;
+		$define{HAVE_LIBNSPR4} = 1;
+		$define{HAVE_LIBNSS3} = 1;
+		$define{HAVE_LIBSSL3} = 1;
+	}
 
 	$self->GenerateConfigHeader('src/include/pg_config.h',     \%define, 1);
 	$self->GenerateConfigHeader('src/include/pg_config_ext.h', \%define, 0);
@@ -998,6 +1009,21 @@ sub AddProject
 			}
 		}
 	}
+	if ($self->{options}->{nss})
+	{
+		$proj->AddIncludeDir($self->{options}->{nss} . '\..\public\nss');
+		$proj->AddIncludeDir($self->{options}->{nss} . '\include\nspr');
+		foreach my $lib (qw(plds4 plc4 nspr4))
+		{
+			$proj->AddLibrary($self->{options}->{nss} .
+							  '\lib\lib' . "$lib.lib", 0);
+		}
+		foreach my $lib (qw(ssl3 smime3 nss3))
+		{
+			$proj->AddLibrary($self->{options}->{nss} .
+							  '\lib' . "\\$lib.dll.lib", 0);
+		}
+	}
 	if ($self->{options}->{nls})
 	{
 		$proj->AddIncludeDir($self->{options}->{nls} . '\include');
-- 
2.21.1 (Apple Git-122.3)