晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 .
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<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>6.31. pam_succeed_if - test account characteristics</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_shells.html" title="6.30. pam_shells - check for valid login shell"><link rel="next" href="sag-pam_tally.html" title="6.32. pam_tally - login counter (tallying) module"></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">6.31. pam_succeed_if - test account characteristics</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="sag-pam_shells.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_tally.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_succeed_if"></a>6.31. pam_succeed_if - test account characteristics</h2></div></div></div><div class="cmdsynopsis"><p><code class="command">pam_succeed_if.so</code>  [<em class="replaceable"><code>flag</code></em>...] [<em class="replaceable"><code>condition</code></em>...]</p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a name="sag-pam_succeed_if-description"></a>6.31.1. DESCRIPTION</h3></div></div></div><p>
      pam_succeed_if.so is designed to succeed or fail authentication
      based on characteristics of the account belonging to the user being
      authenticated or values of other PAM items. One use is to select whether
      to load other modules based on this test.
    </p><p>
      The module should be given one or more conditions as module arguments,
      and authentication will succeed only if all of the conditions are met.
    </p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a name="sag-pam_succeed_if-options"></a>6.31.2. OPTIONS</h3></div></div></div><p>
      The following <span class="emphasis"><em>flag</em></span>s are supported:
    </p><div class="variablelist"><dl class="variablelist"><dt><span class="term"><code class="option">debug</code></span></dt><dd><p>Turns on debugging messages sent to syslog.</p></dd><dt><span class="term"><code class="option">use_uid</code></span></dt><dd><p>
            Evaluate conditions using the account of the user whose UID
            the application is running under instead of the user being
            authenticated.
          </p></dd><dt><span class="term"><code class="option">quiet</code></span></dt><dd><p>Don't log failure or success to the system log.</p></dd><dt><span class="term"><code class="option">quiet_fail</code></span></dt><dd><p>
            Don't log failure to the system log.
          </p></dd><dt><span class="term"><code class="option">quiet_success</code></span></dt><dd><p>
            Don't log success to the system log.
          </p></dd><dt><span class="term"><code class="option">audit</code></span></dt><dd><p>
            Log unknown users to the system log.
          </p></dd></dl></div><p>
      <span class="emphasis"><em>Condition</em></span>s are three words: a field, a test,
      and a value to test for.
    </p><p>
      Available fields are <span class="emphasis"><em>user</em></span>,
      <span class="emphasis"><em>uid</em></span>, <span class="emphasis"><em>gid</em></span>,
      <span class="emphasis"><em>shell</em></span>, <span class="emphasis"><em>home</em></span>,
      <span class="emphasis"><em>ruser</em></span>, <span class="emphasis"><em>rhost</em></span>,
      <span class="emphasis"><em>tty</em></span> and <span class="emphasis"><em>service</em></span>:
    </p><div class="variablelist"><dl class="variablelist"><dt><span class="term"><code class="option">field &lt; number</code></span></dt><dd><p>Field has a value numerically less than number.</p></dd><dt><span class="term"><code class="option">field &lt;= number</code></span></dt><dd><p>
            Field has a value numerically less than or equal to number.
          </p></dd><dt><span class="term"><code class="option">field eq number</code></span></dt><dd><p>
            Field has a value numerically equal to number.
          </p></dd><dt><span class="term"><code class="option">field &gt;= number</code></span></dt><dd><p>
            Field has a value numerically greater than or equal to number.
          </p></dd><dt><span class="term"><code class="option">field &gt; number</code></span></dt><dd><p>
            Field has a value numerically greater than number.
          </p></dd><dt><span class="term"><code class="option">field ne number</code></span></dt><dd><p>
            Field has a value numerically different from number.
          </p></dd><dt><span class="term"><code class="option">field = string</code></span></dt><dd><p>
            Field exactly matches the given string.
          </p></dd><dt><span class="term"><code class="option">field != string</code></span></dt><dd><p>
            Field does not match the given string.
          </p></dd><dt><span class="term"><code class="option">field =~ glob</code></span></dt><dd><p>Field matches the given glob.</p></dd><dt><span class="term"><code class="option">field !~ glob</code></span></dt><dd><p>Field does not match the given glob.</p></dd><dt><span class="term"><code class="option">field in item:item:...</code></span></dt><dd><p>Field is contained in the list of items separated by colons.</p></dd><dt><span class="term"><code class="option">field notin item:item:...</code></span></dt><dd><p>Field is not contained in the list of items separated by colons.</p></dd><dt><span class="term"><code class="option">user ingroup group</code></span></dt><dd><p>User is in given group.</p></dd><dt><span class="term"><code class="option">user notingroup group</code></span></dt><dd><p>User is not in given group.</p></dd><dt><span class="term"><code class="option">user innetgr netgroup</code></span></dt><dd><p>(user,host) is in given netgroup.</p></dd><dt><span class="term"><code class="option">user notinnetgr group</code></span></dt><dd><p>(user,host) is not in given netgroup.</p></dd></dl></div></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a name="sag-pam_succeed_if-types"></a>6.31.3. MODULE TYPES PROVIDED</h3></div></div></div><p>
      All module types (<code class="option">account</code>, <code class="option">auth</code>,
      <code class="option">password</code> and <code class="option">session</code>) are provided.
    </p></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a name="sag-pam_succeed_if-return_values"></a>6.31.4. RETURN VALUES</h3></div></div></div><div class="variablelist"><dl class="variablelist"><dt><span class="term">PAM_SUCCESS</span></dt><dd><p>
              The condition was true.
            </p></dd><dt><span class="term">PAM_AUTH_ERR</span></dt><dd><p>
              The condition was false.
            </p></dd><dt><span class="term">PAM_SERVICE_ERR</span></dt><dd><p>
              A service error occurred or the arguments can't be
              parsed correctly.
            </p></dd></dl></div></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a name="sag-pam_succeed_if-examples"></a>6.31.5. EXAMPLES</h3></div></div></div><p>
      To emulate the behaviour of <span class="emphasis"><em>pam_wheel</em></span>, except
      there is no fallback to group 0:
    </p><pre class="programlisting">
auth required pam_succeed_if.so quiet user ingroup wheel
    </pre><p>
      Given that the type matches, only loads the othermodule rule if
      the UID is over 500. Adjust the number after default to skip
      several rules.
    </p><pre class="programlisting">
type [default=1 success=ignore] pam_succeed_if.so quiet uid &gt; 500
type required othermodule.so arguments...
    </pre></div><div class="section"><div class="titlepage"><div><div><h3 class="title"><a name="sag-pam_succeed_if-author"></a>6.31.6. AUTHOR</h3></div></div></div><p>Nalin Dahyabhai &lt;nalin@redhat.com&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_shells.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_tally.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">6.30. pam_shells - check for valid login shell </td><td width="20%" align="center"><a accesskey="h" href="Linux-PAM_SAG.html">Home</a></td><td width="40%" align="right" valign="top"> 6.32. pam_tally - login counter (tallying) module</td></tr></table></div></body></html>

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