PAM conversation stuff

Nicolas Williams Nicolas.Williams at
Sat Oct 27 00:25:18 EST 2001

On Fri, Oct 26, 2001 at 09:07:35AM -0500, mouring at wrote:
> For non-interactive connections it should *NEVER* attempt a password
> change, but it should notify the user for the reason of failure to
> connect.

Right. Alternatively, pam_chauthtok() can be called, and it can be left
to the conversation function to return an error to the modules'
pam_sm_chauthtok()s, causing pam_chauthtok() to fail.

> The problem is people wanted to have some PAM modules for setting limits,
> etc apply to non-interactive session.  Which works fine under Linux, but
> failure utterly under Solaris.

PAM_UNIX on Solaris was failing, not PAM as a whole. And there's a
simple workaround, namely to supply a bogus TTY when there is none.

> Moffat, there is a 'compatibility-a-thon' occuring soon.. Maybe there
> should be a 'PAM' booth to get Linux, Sun, HP, etc all on the same page.
> <grin>

Oh yes, absolutely. There's too much divergence now between the three,
and XSSO is underspecified. And PAM needs improvements anyways.

> - Ben


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