Re: [gdm-list] GDM user authentication problem

[Brian Cameron <Brian Cameron Sun COM>]

Aldo:

Does your PAM implementation support debug?  On Solaris you can add the
keyword "debug" to a line in the pam configuration file to get syslog
debug output.  Not sure about your distro, you'ld need to check.  I
suspect that could highlight the error.  If the authentication is
failing, then PAM is the code doign the actual authentication.  GDM
just blindly passes the username/password/etc. information along to
PAM.

Brian


> I also thougth the problem is related to PAM. However if I reset the system
> when the problem happens I can login that one time, but not a second time.
> It's really abnormal.
>
> I inspected GDM's pam config file but nothing jumps out at me. See below:
>
> cat /etc/pam.d/gdm
> auth required pam_listfile.so onerr=succeed item=user sense=deny
> file=/etc/bastille-no-login
> #%PAM-1.0
> auth       required     pam_env.so
> auth       required     pam_stack.so service=system-auth
> auth       required     pam_nologin.so
> account    required     pam_stack.so service=system-auth
> password   required     pam_stack.so service=system-auth
> session    required     pam_stack.so service=system-auth
> session    optional     pam_console.so
>
> I have seen one or two references elsewhere in which someone either added
> a line or took one out. But which one?
>
> Also, I was checking GDM with /usr/sbin/gdmsetup, but nothing seems
> out of place.
> I feel like I'm looking for a needle in a haystack.
>
> Thanks Brian.
> ~af
>
> On Mon, Jun 30, 2008 at 5:07 PM, Brian Cameron <Brian Cameron sun com> wrote:
> > Aldo:
> >
> > To me this looks like an issue with PAM, not GDM.
> >
> > Brian
> >
> >
> > > Hi - I'm new to GDM and need some advice.
> > > I searched the archives and the web but found nothing relevant to
> > > mandriva.
> > >
> > > I have a user that has problems login into his system.
> > > The log files show this error:
> > >
> > > Jun 26 17:12:39 man190 gdm(pam_unix)[5692]: session closed for user jdoe
> > > Jun 26 17:12:47 man190 gdm(pam_unix)[5692]: authentication failure;
> > > logname= uid=0 euid=0 tty=:0 ruser= rhost=  user=jdoe
> > > Jun 26 17:12:51 man190 gdm-binary[5692]: Couldn't authenticate user
> > > Jun 26 17:12:57 man190 gdm(pam_unix)[5692]: authentication failure;
> > > logname= uid=0 euid=0 tty=:0 ruser= rhost=  user=jdoe
> > > Jun 26 17:13:01 man190 gdm-binary[5692]: Couldn't authenticate user
> > > Jun 26 17:13:05 man190 gdm(pam_unix)[5692]: bad username []
> > >
> > > Any pointer as to what causes that?
> > > I'm running Mandriva Linux release 2006.0 (Official) for x86_64 and
> > > gdm-2.8.0.4-1.3.20060mdk.
> > >
> > > thanks.
> > > ~af
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