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Re: pam session
From: Pawel Krawczyk <kravietz () aba krakow pl>
Date: Sat, 23 Jun 2001 10:13:41 +0200

On Tue, Jun 19, 2001 at 03:11:02AM +0200, Christian Kraemer wrote:

This is espacially anoying if you
use pam_limits.so to set rlimits. Every user could
cirrcumvent them easily by calling ssh in this way:
ssh user () server /bin/sh

The same problem was present in SSH 1.2.x some time ago and I've created a
patch to fix it (http://ceti.pl/~kravietz/prog.html).

PAM session start had to be called from two procedures (one for
interactive, one for non-interactive login), and then closed. The latter
required keeping session state in some variable all over the login time
and it created several problems how to do this in a nice and secure way.

In general, using the PAM session management required much more effort
than other authentication methods and it was simply skipped by the
developers. However, I don't remember exact details and many things could
have changed in recent PAM versions.


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