SSH / PAM / Kerberos / password aging

Nicolas Williams Nicolas.Williams at
Thu Mar 28 07:23:41 EST 2002

On Tue, Mar 26, 2002 at 05:39:09PM -0500, Nicolas Williams wrote:
> On Tue, Mar 26, 2002 at 05:26:09PM -0500, Nicolas Williams wrote:
> > On Tue, Mar 26, 2002 at 02:13:26PM -0800, Frank Cusack wrote:
> > > Qualified good.  Wouldn't it be better to do pam_acct_mgmt() before kbdint
> > > et al complete?  Your solution requires a rewrite of all PAM modules.
> > 
> > Indeed. Fine. So move pam_acct_mgmt() into do_pam_authenticate() and
> > also pam_chauthtok().
> > 
> > Fine idea. I like it.
> > 
> > > /fc
> I'll post a patch tomorrow.

As you can see from my latest attachement to bug 188 the patch is a bit
more intricate than I'd hoped for. It's very simple for kbd-interactive
userauth, and not so simple for password userauth.

For password userauth support for SSH2_MSG_USERAUTH_PASSWD_CHANGEREQ
must be added or password aging support (in password userauth) must be
dropped altogether. My patch disables password aging in password
userauth. There's more code in session.c and auth-pam.c worth ripping
out if tty-based password aging is removed.

At this point the OpenSSH maintainers need to weigh in and I exit stage left.

On a different, but related, note, is it possible for SSHD to reject
passord userauth altogether if keyboard-interactive userauth was tried
and failed? It's kind of silly to allow the client two different go's at
ultimately the same userauth just because there's two different ways to
do it in the SSHv2 protocol.


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