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>Chapter 7. Glossary of PAM related terms</title><meta name="generator" content="DocBook XSL Stylesheets Vsnapshot"><link rel="home" href="Linux-PAM_ADG.html" title="The Linux-PAM Application Developers' Guide"><link rel="up" href="Linux-PAM_ADG.html" title="The Linux-PAM Application Developers' Guide"><link rel="prev" href="adg-porting.html" title="Chapter 6. Porting legacy applications"><link rel="next" href="adg-example.html" title="Chapter 8. An example application"></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">Chapter 7. Glossary of PAM related terms</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="adg-porting.html">Prev</a> </td><th width="60%" align="center"> </th><td width="20%" align="right"> <a accesskey="n" href="adg-example.html">Next</a></td></tr></table><hr></div><div class="chapter"><div class="titlepage"><div><div><h1 class="title"><a name="adg-glossary"></a>Chapter 7. Glossary of PAM related terms</h1></div></div></div><p>
      The following are a list of terms used within this document.
    </p><div class="variablelist"><dl class="variablelist"><dt><span class="term">Authentication token</span></dt><dd><p>
            Generally, this is a password. However, a user can authenticate
            him/herself in a variety of ways. Updating the user's
            authentication token thus corresponds to
            <span class="emphasis"><em>refreshing</em></span> the object they use to
            authenticate themself with the system. The word password is
            avoided to keep open the possibility that the authentication
            involves a retinal scan or other non-textual mode of
            challenge/response.
          </p></dd><dt><span class="term">Credentials</span></dt><dd><p>
            Having successfully authenticated the user, PAM is able to
            establish certain characteristics/attributes of the user.
            These are termed <span class="emphasis"><em>credentials</em></span>. Examples
            of which are group memberships to perform privileged tasks
            with, and <span class="emphasis"><em>tickets</em></span> in the form of
            environment variables etc. . Some user-credentials, such as
            the user's UID and GID (plus default group memberships) are
            not deemed to be PAM-credentials. It is the responsibility
            of the application to grant these directly.
          </p></dd></dl></div></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="adg-porting.html">Prev</a> </td><td width="20%" align="center"> </td><td width="40%" align="right"> <a accesskey="n" href="adg-example.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">Chapter 6. Porting legacy applications </td><td width="20%" align="center"><a accesskey="h" href="Linux-PAM_ADG.html">Home</a></td><td width="40%" align="right" valign="top"> Chapter 8. An example application</td></tr></table></div></body></html>

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