PAM conversation stuff

Nicolas Williams Nicolas.Williams at
Fri Oct 26 23:38:06 EST 2001

See the Linux-PAM, XSSO and Sun PAM docs here:

and here:


On Thu, Oct 25, 2001 at 05:51:20PM -0400, Ed Phillips wrote:
> Okay, I'm confused again.  They way you guys are talking about the
> conversation routine, it would seem that you think it is a way to fetch
> something from the user - like a new password.  Is this possible?  Does
> calling pam_chauthtok() cause the underlying pam_sm_chauthtok()
> eventually print something on stdout and read a new password from stdin
> (the socket to the client) using the conversation routine?  If this is
> what is happening, then logically the bug is in the part of the
> conversation routine that isn't checking to see if stdin/stdout is a TTY
> before trying to prompt the user for info.
> Conversely, the conversation routine is just a glorified "printf", then
> where in the heck is the password read in, and where is pam_set_item()
> being called to fill in the details before the call to pam_chauthtok() can
> actually update the password?
> Thanks,
> 	Ed
> Ed Phillips <ed at> University of Delaware (302) 831-6082
> Systems Programmer III, Network and Systems Services
> finger -l ed at for PGP public key
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