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PAM configuration: Kerberos authentication and NIS authorization problem

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Operating Systems Linux Red Hat PAM configuration: Kerberos authentication and NIS authorization problem
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Old 01-12-2010
PAM configuration: Kerberos authentication and NIS authorization problem


I've configured two linux boxes to authenticate against Windows Active Directory using Kerberos while retrieving authorization data (uids, gids ,,,)from NIS.

The problem I ran into with my PAM configuration is that all authentication attempts succeed in order.i.e. if someone tried his NIS credentials he will be granted access!!

What I want is this: Kerberos authentication is tried first; if it fails, local files authentication ONLY is tried.

here's my PAM configuration from system-auth pam configuration file which is included by all systems pam-aware services:

auth        required
auth        sufficient debug
auth        sufficient nullok try_first_pass
auth        requisite uid >= 500 quiet
auth        required

The issue here: I think the pam_unix module somehow contacts NIS for authentication if Kerberos fails. But, I had updated my sswitch.conf to look like:

passwd:     files nis
shadow:     files
group:      files nis

I thought the module references this file to see where to look up passwords.

Please note that I can't remove nis form passwd and group sections because this is needed to get authorization (uid,gid) data from NIS.

The point is, above nsswitch.conf didn't resolve the issue, users are still able to log in using their NIS credentials!

Please help me figure out what is wrong here.

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