On Tue, 25 Jun 2002, Steve Langasek wrote:

> On Tue, Jun 25, 2002 at 04:32:21PM -0400, Robert P. J. Day wrote:
> > can anyone explain the rationale behind the "pam_permit"
> > lines in, for instance, the /etc/pam.d/up2date file in red hat
> > 7.3?
>
> > #%PAM-1.0
> > auth sufficient /lib/security/pam_rootok.so
> > auth required /lib/security/pam_stack.so service=system-auth
> > session required /lib/security/pam_permit.so
> > session optional /lib/security/pam_xauth.so
> > account required /lib/security/pam_permit.so
>
> > as i understand it, pam_permit.so always returns success, so what
> > does it add to this file?
>
> It ensures that a failure in pam_xauth doesn't cause the session to
> abort.

ok, i think i see why that is. according to the docs, the only time
something with a control flag of "optional" is necessary for
authentication is if *no* *other* module of that module type
has either succeeded or failed. if the pam_xauth.so was the
only "session" module type and it failed, that would mean an
overall failure. so putting in the session permit line just
guarantees that, even if pam_xauth.so failed, you'd still get
an overall success. is that how it works?

in that case, though, why is there a single permit line for
the "account" module type? the same logic surely doesn't hold
here. so i'm still a mite confused.

rday

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