* Thomas Hallgren <thhal@mailblocks.com> [2004-10-14 17:27:20 +0200]:
> I'm connected to a database and I want to verify that a username and
> password for some user is correct. I know I can verify a users existence
> by doing:
>
> select exists(select * from pg_user where usename = $1)
You can get at the md5 hashed passwords in the pg_shadow table
provided your user has the requisite permission.
There may be something out there already that does this for you, but
this is how the function/query might look if you went the Brute Force
(tm) route.
CREATE FUNCTION check_passwd(text,text) RETURNS boolean AS 'SELECT
CASE WHEN passwd = md5($2) THEN true ELSE false END FROM pg_shadow
WHERE usename = $1;' LANGUAGE sql;
--
Steven Klassen - Lead Programmer
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PostgreSQL Replication & Support Services, (503) 667-4564