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   $Id: pam_lastlog.sgml,v 1.2 2001/02/17 01:55:38 agmorgan Exp $
   
   This file was written by Andrew G. Morgan <morgan@kernel.org>
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<sect1>The last login module

<sect2>Synopsis

<p>
<descrip>

<tag><bf>Module Name:</bf></tag>
<tt/pam_lastlog/

<tag><bf>Author:</bf></tag>
Andrew G. Morgan &lt;morgan@kernel.org&gt;

<tag><bf>Maintainer:</bf></tag>
Author

<tag><bf>Management groups provided:</bf></tag>
auth

<tag><bf>Cryptographically sensitive:</bf></tag>
	
<tag><bf>Security rating:</bf></tag>

<tag><bf>Clean code base:</bf></tag>

<tag><bf>System dependencies:</bf></tag>
uses information contained in the <tt>/var/log/lastlog</tt> file.

<tag><bf>Network aware:</bf></tag>

</descrip>

<sect2>Overview of module

<p>
This session module maintains the <tt>/var/log/lastlog</tt> file.  Adding
an open entry when called via the <tt>pam_open_seesion()</tt> function
and completing it when <tt>pam_close_session()</tt> is called.  This
module can also display a line of information about the last login of
the user.  If an application already performs these tasks, it is not
necessary to use this module.

<sect2>Session component

<p>
<descrip>

<tag><bf>Recognized arguments:</bf></tag>
<tt/debug/; <tt/nodate/; <tt/noterm/; <tt/nohost/; <tt/silent/;
<tt/never/

<tag><bf>Description:</bf></tag>

<p>
This module can be used to provide a ``Last login on ...''
message. when the user logs into the system from what ever application
uses the PAM libraries.  In addition, the module maintains the
<tt>/var/log/lastlog</tt> file.

<p>
The behavior of this module can be modified with one of the following
flags:

<p>
<itemize>
<item><tt/debug/
- write more information to <tt/syslog(3)/.

<item><tt/nodate/
- neglect to give the date of the last login when displaying
information about the last login on the system.

<item><tt/noterm/ 
- neglect to diplay the terminal name on which the last login was
attempt.

<item><tt/nohost/
- neglect to indicate from which host the last login was attempted.

<item><tt/silent/
- neglect to inform the user about any previous login: just update
the <tt>/var/log/lastlog</tt> file.

<item><tt/never/
- if the <tt>/var/log/lastlog</tt> file does not contain any old entries
for the user, indicate that the user has never previously logged in
with a ``welcome..." message.

</itemize>

<tag><bf>Examples/suggested usage:</bf></tag>

This module can be used to indicate that the user has new mail when
they <em/login/ to the system. Here is a sample entry for your
<tt>/etc/pam.d/XXX</tt> file:
<tscreen>
<verb>
#
# When were we last here?
#
session	 optional	pam_lastlog.so
</verb>
</tscreen>

<p>
Note, some applications may perform this function themselves. In such
cases, this module is not necessary.

</descrip>

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