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Edit: /usr/share/doc/pam/html/sag-pam_pwhistory.html (8476B)

<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>6.25. pam_pwhistory - grant access using .pwhistory file</title><meta name="generator" content="DocBook XSL Stylesheets Vsnapshot"><link rel="home" href="Linux-PAM_SAG.html" title="The Linux-PAM System Administrators' Guide"><link rel="up" href="sag-module-reference.html" title="Chapter 6. A reference guide for available modules"><link rel="prev" href="sag-pam_permit.html" title="6.24. pam_permit - the promiscuous module"><link rel="next" href="sag-pam_rhosts.html" title="6.26. pam_rhosts - grant access using .rhosts file"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">6.25. pam_pwhistory - grant access using .pwhistory file</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="sag-pam_permit.html">Prev</a> </td><th width="60%" align="center">Chapter 6. A reference guide for available modules</th><td width="20%" align="right"> <a accesskey="n" href="sag-pam_rhosts.html">Next</a></td></tr></table><hr></div><div class="section"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="sag-pam_pwhistory"></a>6.25. pam_pwhistory - grant access using .pwhistory file</h2></div></div></div><div class="cmdsynopsis"><p><code class="command">pam_pwhistory.so</code>  [
        debug
      ] [
        use_authtok
      ] [
        enforce_for_root
      ] [
        remember=<em class="replaceable"><code>N</code></em>
      ] [
        retry=<em class="replaceable"><code>N</code></em>
      ] [
        authtok_type=<em class="replaceable"><code>STRING</code></em>
      ] [
	      conf=<em class="replaceable"><code>/path/to/config-file</code></em>
      ]</p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a name="sag-pam_pwhistory-description"></a>6.25.1. DESCRIPTION</h3></div></div></div><p>
      This module saves the last passwords for each user in order
      to force password change history and keep the user from
      alternating between the same password too frequently.
    </p><p>
      This module does not work together with kerberos. In general,
      it does not make much sense to use this module in conjunction
      with NIS or LDAP, since the old passwords are stored on the
      local machine and are not available on another machine for
      password history checking.
    </p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a name="sag-pam_pwhistory-options"></a>6.25.2. OPTIONS</h3></div></div></div><div class="variablelist"><dl class="variablelist"><dt><span class="term">
          <code class="option">debug</code>
        </span></dt><dd><p>
            Turns on debugging via
            <span class="citerefentry"><span class="refentrytitle">syslog</span>(3)</span>.
          </p></dd><dt><span class="term">
          <code class="option">use_authtok</code>
        </span></dt><dd><p>
           When password changing enforce the module to use the new password
           provided by a previously stacked <code class="option">password</code>
           module (this is used in the example of the stacking of the
           <span class="command"><strong>pam_cracklib</strong></span> module documented below).
          </p></dd><dt><span class="term">
          <code class="option">enforce_for_root</code>
        </span></dt><dd><p>
            If this option is set, the check is enforced for root, too.
          </p></dd><dt><span class="term">
          <code class="option">remember=<em class="replaceable"><code>N</code></em></code>
        </span></dt><dd><p>
            The last <em class="replaceable"><code>N</code></em> passwords for each
            user are saved.
            The default is <span class="emphasis"><em>10</em></span>. Value of
            <span class="emphasis"><em>0</em></span> makes the module to keep the existing
            contents of the <code class="filename">opasswd</code> file unchanged.
          </p></dd><dt><span class="term">
            <code class="option">retry=<em class="replaceable"><code>N</code></em></code>
          </span></dt><dd><p>
              Prompt user at most <em class="replaceable"><code>N</code></em> times
              before returning with error. The default is
              <span class="emphasis"><em>1</em></span>.
            </p></dd><dt><span class="term">
            <code class="option">authtok_type=<em class="replaceable"><code>STRING</code></em></code>
          </span></dt><dd><p>
              See <span class="citerefentry"><span class="refentrytitle">pam_get_authtok</span>(3)</span> for more details.
            </p></dd><dt><span class="term">
            <code class="option">conf=<em class="replaceable"><code>/path/to/config-file</code></em></code>
          </span></dt><dd><p>
              Use another configuration file instead of the default
              <code class="filename">/etc/security/pwhistory.conf</code>.
            </p></dd></dl></div><p>
      The options for configuring the module behavior are described in the
      <span class="citerefentry"><span class="refentrytitle">pwhistory.conf</span>(5)</span> manual page. The options
      specified on the module command line override the values from the
      configuration file.
    </p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a name="sag-pam_pwhistory-types"></a>6.25.3. MODULE TYPES PROVIDED</h3></div></div></div><p>
      Only the <code class="option">password</code> module type is provided.
    </p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a name="sag-pam_pwhistory-return_values"></a>6.25.4. RETURN VALUES</h3></div></div></div><div class="variablelist"><dl class="variablelist"><dt><span class="term">PAM_AUTHTOK_ERR</span></dt><dd><p>
            No new password was entered, the user aborted password
            change or new password couldn't be set.
          </p></dd><dt><span class="term">PAM_IGNORE</span></dt><dd><p>
            Password history was disabled.
          </p></dd><dt><span class="term">PAM_MAXTRIES</span></dt><dd><p>
            Password was rejected too often.
          </p></dd><dt><span class="term">PAM_USER_UNKNOWN</span></dt><dd><p>
            User is not known to system.
          </p></dd></dl></div></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a name="sag-pam_pwhistory-files"></a>6.25.5. FILES</h3></div></div></div><div class="variablelist"><dl class="variablelist"><dt><span class="term"><code class="filename">/etc/security/opasswd</code></span></dt><dd><p>File with password history</p></dd></dl></div></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a name="sag-pam_pwhistory-examples"></a>6.25.6. EXAMPLES</h3></div></div></div><p>
      An example password section would be:
      </p><pre class="programlisting">
#%PAM-1.0
password     required       pam_pwhistory.so
password     required       pam_unix.so        use_authtok
      </pre><p>
    </p><p>
     In combination with <span class="command"><strong>pam_cracklib</strong></span>:
      </p><pre class="programlisting">
#%PAM-1.0
password     required       pam_cracklib.so    retry=3
password     required       pam_pwhistory.so   use_authtok
password     required       pam_unix.so        use_authtok
      </pre><p>
    </p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a name="sag-pam_pwhistory-author"></a>6.25.7. AUTHOR</h3></div></div></div><p>
        pam_pwhistory was written by Thorsten Kukuk &lt;kukuk@thkukuk.de&gt;
      </p></div></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="sag-pam_permit.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="sag-module-reference.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="sag-pam_rhosts.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">6.24. pam_permit - the promiscuous module </td><td width="20%" align="center"><a accesskey="h" href="Linux-PAM_SAG.html">Home</a></td><td width="40%" align="right" valign="top"> 6.26. pam_rhosts - grant access using .rhosts file</td></tr></table></div></body></html>

6.25. pam_pwhistory - grant access using .pwhistory file

6.25. pam_pwhistory - grant access using .pwhistory file
Prev	Chapter 6. A reference guide for available modules	Next

6.25. pam_pwhistory - grant access using .pwhistory file

pam_pwhistory.so [ debug ] [ use_authtok ] [ enforce_for_root ] [ remember=N ] [ retry=N ] [ authtok_type=STRING ] [ conf=/path/to/config-file ]

6.25.1. DESCRIPTION

This module saves the last passwords for each user in order to force password change history and keep the user from alternating between the same password too frequently.

This module does not work together with kerberos. In general, it does not make much sense to use this module in conjunction with NIS or LDAP, since the old passwords are stored on the local machine and are not available on another machine for password history checking.

6.25.2. OPTIONS

debug: Turns on debugging via syslog(3).
use_authtok: When password changing enforce the module to use the new password provided by a previously stacked password module (this is used in the example of the stacking of the pam_cracklib module documented below).
enforce_for_root: If this option is set, the check is enforced for root, too.
remember=N: The last N passwords for each user are saved. The default is 10. Value of 0 makes the module to keep the existing contents of the opasswd file unchanged.
retry=N: Prompt user at most N times before returning with error. The default is 1.
authtok_type=STRING: See pam_get_authtok(3) for more details.
conf=/path/to/config-file: Use another configuration file instead of the default /etc/security/pwhistory.conf.

The options for configuring the module behavior are described in the pwhistory.conf(5) manual page. The options specified on the module command line override the values from the configuration file.

6.25.3. MODULE TYPES PROVIDED

Only the password module type is provided.

6.25.4. RETURN VALUES

PAM_AUTHTOK_ERR: No new password was entered, the user aborted password change or new password couldn't be set.
PAM_IGNORE: Password history was disabled.
PAM_MAXTRIES: Password was rejected too often.
PAM_USER_UNKNOWN: User is not known to system.

6.25.5. FILES

/etc/security/opasswd: File with password history

6.25.6. EXAMPLES

An example password section would be:

#%PAM-1.0
password     required       pam_pwhistory.so
password     required       pam_unix.so        use_authtok

In combination with pam_cracklib:

#%PAM-1.0
password     required       pam_cracklib.so    retry=3
password     required       pam_pwhistory.so   use_authtok
password     required       pam_unix.so        use_authtok

6.25.7. AUTHOR

pam_pwhistory was written by Thorsten Kukuk <kukuk@thkukuk.de>

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