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

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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@xxxxxxxxxxxxxxx')
$_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I'm assuming this is out of date, or has changed with mod_auth_kerb 5.0,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.


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