Re: pg_ident.conf not working?

Joe Brenner <doom@kzsu.stanford.edu> wrote:

> I've noticed a difference in postgresql 8.3 and 9.0.1 that I suspect
> is a bug.  pg_ident.conf isn't working the way it used to.
>
> I have a website set-up with apache running as using user
> "www-data".  As I remember it, I found that it was difficult to
> set-up a postgres user name with a hyphen in it, so I fell back
> on creating a "www" postgres account, and I used the mapping:
>
> pg_ident.conf:
>
>   # MAPNAME       SYSTEM-USERNAME         PG-USERNAME
>   apache          www-data                www
>
> That used to work with postgres 8.3 (running on the same
> box as apache, of course), now with postgres 9.0.1 I can't
> get things like this to work:
>
> pg_hba.conf
>
>   # TYPE  DATABASE    USER        CIDR-ADDRESS          METHOD
>   local   my_dbname   www                               ident
>
> The log shows the error message:
>
>   LOG:  provided user name (www) and authenticated user name (www-data) do not match
>   FATAL:  Ident authentication failed for user "www"
>
> I can "fix" this by changing "ident" to "trust", but I'd
> rather restrict access to just the apache user.
>
> (Hm... maybe I need to try "ident map=apache"?)

Yes, it turns out that if I use the "map" option to explicitly tell it
which line of pg_ident.conf I want it to use, I can get it to work.

I stumbled across that here:


http://www.builderau.com.au/program/mysql/soa/Why-PostgreSQL-is-a-better-enterprise-database-than-MySQL/0,339028784,339300964,00.htm

Though I see it is indeed explained where it should be, I just kept
skimming past it:

  http://developer.postgresql.org/pgdocs/postgres/auth-username-maps.html

More code examples would help...