LDAP referrals
Hello All,
Is there a way to disable chasing LDAP referrals in PostgreSQL?
Take the following LDAP config options from pg_hba.conf
ldapserver=server.org.com
ldapbinddn="cn=bindUser,cn=users,dc=core,dc=dir,dc=org,dc=com"
ldapbindpasswd="bindPass" ldapbasedn="dc=core,dc=dir,dc=org,dc=com"
ldapsearchattribute="sAMAccountName"
From ldapsearch I can do the following search:
ldapsearch -x -h server.org.com \
-D "cn=bindUser,cn=users,dc=core,dc=dir,dc=org,dc=com" -W \
-b "dc=core,dc=dir,dc=org,dc=com" \
"sAMAccountName=searchUser" sAMAccountName
Which gives me the following response:
# extended LDIF
#
# LDAPv3
# base <dc=core,dc=dir,dc=org,dc=com> with scope subtree
# filter: sAMAccountName=searchUser
# requesting: sAMAccountName
#
# d248265, People, eProfile, server.org.com
dn: CN=searchUser,OU=People,OU=eProfile,DC=core,DC=dir,DC=org,DC=com
sAMAccountName: searchUser
# search reference
ref: ldap://otherserver.org.com/CN=Configuration,DC=core,DC=dir,DC=org,DC
=com
# search result
search: 2
result: 0 Success
# numResponses: 3
# numEntries: 1
# numReferences: 1
Which is expected.
If I run psql like so:
psql -U d248265 -h 127.0.0.1 dccn
then it hangs. From a packet capture I've determined that in this time it
is trying to resolve the referral, which is broken and times out.
I can verify this by re-running the above ldapsearch with the -C
option (automatically
chase referrals). This hangs as well.
I know that the real root cause if my broken LDAP server, but is there a
way to disable chasing referrals?
Cheers,
James Sewell
James Sewell
PostgreSQL Team Lead / Solutions Architect
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On Wed, Jun 26, 2013 at 3:47 AM, James Sewell <james.sewell@lisasoft.com>wrote:
Hello All,
Is there a way to disable chasing LDAP referrals in PostgreSQL?
There is not, at this point. It would probably be fairly trivial to add a
pg_hba parameter to turn it off (since it's, AFAIK, just a call to
ldap_set_option), but it's not possible to do with current versions of
PostgreSQL.
<snip>
You could try injecting a simple ldap_set_opttion() that turns off
LDAP_OPT_REFERRALS in InitializeLdapConnection() in auth.c, to see if that
works. If it solves the problem, it might be worth turning it into an
actual option.
If I run psql like so:
psql -U d248265 -h 127.0.0.1 dccn
then it hangs. From a packet capture I've determined that in this time it
is trying to resolve the referral, which is broken and times out.
As you say, a quick fix would of course be to fix your server not to send
broken referrals ;)
But I can see how it could perhaps still be useful to be able to block
referrals. I think the reason it's not in there already is mainly that it
doesn't make much sense for the actual login bind - but it does make more
sense for the search step that happens before the bind.
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Magnus Hagander
Me: http://www.hagander.net/
Work: http://www.redpill-linpro.com/