Re: [PHP] Kerberos, Apache2, mod_auth_kerb, PHP, and PostgreSQL in

Mark Gibson wrote:
> Hi,
> I've been trying to Kerberize our Apache and PostgreSQL servers for
> our company's web applications.
>
> Goal: To connect from a PHP web app to a PostgreSQL database
> using the users credentials, so all authorization is managed via
> privileges within the database.
>
> Our IT dept has recently installed Windows 2003 Server to provide
> authentication & directories via Kerberos and LDAP.
>
> I've managed to configure Apache (2.0.49) to authenticate users using
> mod_auth_kerb (5.0-rc6), and also PostgreSQL (7.4.3) to use Kerberos.
> (Linux hosts use MIT KerberosV5 1.3.3 client libs, KDC is Windows 2003)
>
> mod_auth_kerb is configured with:
>
> KrbSaveCredentials on
>
> So in PHP (4.3.8) we end up with the variables:
>
> $_SERVER['REMOTE_USER'] (eg: 'gibsonm(at)OUR-REALM(dot)CO(dot)UK')
> $_SERVER['KRB5CCNAME'] (eg: 'FILE:/tmp/krb5cc_apache_tVFJCd')
>
> Even HTTP Negotiate works with Firefox/Linux (but not IE/XP yet!) :)
>
> But this is where I get stuck.
> How do I use the supplied credentials file to connect to PostgreSQL?
>
> In the PostgreSQL docs it says:
> (http://www.postgresql.org/docs/7.4/interactive/auth-methods.html#KERBEROS-AUTH)
>
>
> > If you use mod_auth_kerb from http://modauthkerb.sf.net and mod_perl
> > on your Apache web server, you can use AuthType
> > KerberosV5SaveCredentials with a mod_perl script. This gives secure
> > database access over the web, no extra passwords required.
>
> I'm assuming this is out of date, or has changed with mod_auth_kerb 5.0,
> and that the KrbSaveCredentials directive does this job instead.

I'VE DONE IT! THE HOLY GRAIL OF WEB/DB APPS! :)

All it takes it this line your PHP script:

putenv("KRB5CCNAME={$_SERVER['KRB5CCNAME']}");

Then pg_connect works :)

--
Mark Gibson <gibsonm |AT| cromwell |DOT| co |DOT| uk>
Web Developer & Database Admin
Cromwell Tools Ltd.
Leicester, England.