pam_krb5 and blank passwords.

[Ian Mortimer <ian physics uq edu au>]

We've been using this auth configuration to allow login with krb5 (AD)
or with a unix password:

auth        required      pam_env.so
auth        sufficient    pam_krb5.so
auth        sufficient    pam_unix.so use_first_pass
auth        required      pam_deny.so

The way this works has changed between pam-0.79 + pam_krb5-2.1.15
and pam-0.99.6.2 + pam_krb5-2.2.11.

Previously if a user had an AD account but no password set they
could not login with a blank password - now they can.  This 
probably should be fixed in AD but I was wondering if there's a 
way of doing it through pam.


Thanks
---
Ian