Password encryption

On 04/15/2018 05:22 PM, Azimuddin Mohammed wrote:

Hello,
Is there a way I can encrypt the default password column of db user
password. I know by default the password is encrypted as md5, can we
encrypt that of shadow column for password?

Are you talking about this view?:

https://www.postgresql.org/docs/10/static/view-pg-shadow.html

If so that is only readable by superusers:

production=# \c - aklaver
You are now connected to database "production" as user "aklaver".

production=> select * from pg_shadow ;
ERROR: permission denied for relation pg_shadow

production=> \c - postgres
You are now connected to database "production" as user "postgres".

production=# select * from pg_shadow ;
usename | usesysid | usecreatedb | usesuper | userepl |
usebypassrls | passwd | valuntil | useconfig

...

Assuming someone is in your database as a superuser, access to the
password field in pg_shadow is pretty much moot.

Thanks in advance

--
Adrian Klaver
adrian.klaver@aklaver.com

On 04/15/2018 07:22 PM, Azimuddin Mohammed wrote:

Hello,
Is there a way I can encrypt the default password column of db user
password. I know by default the password is encrypted as md5, can we
encrypt that of shadow column for password?

MD5 is a *one-way hash*, not an encryption scheme.  Thus, the password
cannot be reverse-computed from the MD5 hash value.  So, you're (kinda)
safe, although an attacker could determine the password through brute-force
calculation of hashes.

--
Angular momentum makes the world go 'round.