/dt><dd><p>
            Use the authentication token previously obtained by
            another module that did the conversation with the
            application.  If this token can not be obtained then
            the module will try to converse. This option can
            be used for stacking different modules that need to
            deal with the authentication tokens.
          </p></dd><dt><span class="term">
          use_first_pass
        </span></dt><dd><p>
            Use the authentication token previously obtained by
            another module that did the conversation with the
            application.  If this token can not be obtained then
            the module will fail. This option can be used for
            stacking different modules that need to deal with
            the authentication tokens.
          </p></dd><dt><span class="term">
          unknown_ok
        </span></dt><dd><p>
            Do not return error when checking for a user that is
            not in the database. This can be used to stack more
            than one pam_userdb module that will check a
            username/password pair in more than a database.
          </p></dd><dt><span class="term">
          key_only
        </span></dt><dd><p>
            The username and password are concatenated together
            in the database hash as 'username-password' with a
            random value.  if the concatenation of the username and
            password with a dash in the middle returns any result,
            the user is valid.  this is useful in cases where
            the username may not be unique but the username and
            password pair are.
          </p></dd></dl></div></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a name="sag-pam_userdb-types"></a>6.40.3. MODULE TYPES PROVIDED</h3></div></div></div><p>
      The <code class="option">auth</code> and <code class="option">account</code> module
      types are provided.
    </p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a name="sag-pam_userdb-return_values"></a>6.40.4. RETURN VALUES</h3></div></div></div><div class="variablelist"><dl class="variablelist"><dt><span class="term">PAM_AUTH_ERR</span></dt><dd><p>Authentication failure.</p></dd><dt><span class="term">PAM_AUTHTOK_RECOVERY_ERR</span></dt><dd><p>
            Authentication information cannot be recovered.
          </p></dd><dt><span class="term">PAM_BUF_ERR</span></dt><dd><p>
             Memory buffer error.
          </p></dd><dt><span class="term">PAM_CONV_ERR</span></dt><dd><p>
             Conversation failure.
          </p></dd><dt><span class="term">PAM_SERVICE_ERR</span></dt><dd><p>
             Error in service module.
          </p></dd><dt><span class="term">PAM_SUCCESS</span></dt><dd><p>
            Success.
          </p></dd><dt><span class="term">PAM_USER_UNKNOWN</span></dt><dd><p>
            User not known to the underlying authentication module.
          </p></dd></dl></div></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a name="sag-pam_userdb-examples"></a>6.40.5. EXAMPLES</h3></div></div></div><pre class="programlisting">
auth  sufficient pam_userdb.so icase db=/etc/dbtest
    </pre></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a name="sag-pam_userdb-author"></a>6.40.6. AUTHOR</h3></div></div></div><p>
        pam_userdb was written by Cristian Gafton &gt;gafton@redhat.com&lt;.
      </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_unix.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_warn.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">6.39. pam_unix - traditional password authentication </td><td width="20%" align="center"><a accesskey="h" href="Linux-PAM_SAG.html">Home</a></td><td width="40%" align="right" valign="top"> 6.41. pam_warn - logs all PAM items</td></tr></table></div></body></html>