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<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>Chapter 4.  Security issues of Linux-PAM</title><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"><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-interface-programming-notes.html" title="3.3. Programming notes"><link rel="next" href="adg-security-library-calls.html" title="4.1. Care about standard library calls"></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 4. 
      Security issues of <span class="emphasis"><em>Linux-PAM</em></span>
    </th></tr><tr><td width="20%" align="left"><a accesskey="p" href="adg-interface-programming-notes.html">Prev</a> </td><th width="60%" align="center"> </th><td width="20%" align="right"> <a accesskey="n" href="adg-security-library-calls.html">Next</a></td></tr></table><hr></div><div class="chapter"><div class="titlepage"><div><div><h1 class="title"><a name="adg-security"></a>Chapter 4. 
      Security issues of <span class="emphasis"><em>Linux-PAM</em></span>
    </h1></div></div></div><div class="toc"><p><b>Table of Contents</b></p><dl class="toc"><dt><span class="section"><a href="adg-security-library-calls.html">4.1. Care about standard library calls</a></span></dt><dt><span class="section"><a href="adg-security-service-name.html">4.2. Choice of a service name</a></span></dt><dt><span class="section"><a href="adg-security-conv-function.html">4.3. The conversation function</a></span></dt><dt><span class="section"><a href="adg-security-user-identity.html">4.4. The identity of the user</a></span></dt><dt><span class="section"><a href="adg-security-resources.html">4.5. Sufficient resources</a></span></dt></dl></div><p>
      PAM, from the perspective of an application, is a convenient API for
      authenticating users. PAM modules generally have no increased
      privilege over that possessed by the application that is making use of
      it. For this reason, the application must take ultimate responsibility
      for protecting the environment in which PAM operates.
    </p><p>
      A poorly (or maliciously) written application can defeat any
      <span class="emphasis"><em>Linux-PAM</em></span> module's authentication
      mechanisms by simply ignoring it's return values. It is the
      applications task and responsibility to grant privileges and access
      to services.  The <span class="emphasis"><em>Linux-PAM</em></span> library
      simply assumes the responsibility of <span class="emphasis"><em>authenticating</em></span>
      the user; ascertaining that the user <span class="emphasis"><em>is</em></span> who they
      say they are. Care should be taken to anticipate all of the documented
      behavior of the <span class="emphasis"><em>Linux-PAM</em></span> library
      functions. A failure to do this will most certainly lead to a future
      security breach.
    </p></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="adg-interface-programming-notes.html">Prev</a> </td><td width="20%" align="center"> </td><td width="40%" align="right"> <a accesskey="n" href="adg-security-library-calls.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">3.3. Programming notes </td><td width="20%" align="center"><a accesskey="h" href="Linux-PAM_ADG.html">Home</a></td><td width="40%" align="right" valign="top"> 4.1. Care about standard library calls</td></tr></table></div></body></html>

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