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<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>4.3. Example configuration file entries</title><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"><link rel="home" href="Linux-PAM_SAG.html" title="The Linux-PAM System Administrators' Guide"><link rel="up" href="sag-configuration.html" title="Chapter 4. The Linux-PAM configuration file"><link rel="prev" href="sag-configuration-directory.html" title="4.2. Directory based configuration"><link rel="next" href="sag-security-issues.html" title="Chapter 5. Security issues"></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">4.3. Example configuration file entries</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="sag-configuration-directory.html">Prev</a> </td><th width="60%" align="center">Chapter 4. The Linux-PAM configuration file</th><td width="20%" align="right"> <a accesskey="n" href="sag-security-issues.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-configuration-example"></a>4.3. Example configuration file entries</h2></div></div></div><p> In this section, we give some examples of entries that can be present in the <span class="emphasis"><em>Linux-PAM</em></span> configuration file. As a first attempt at configuring your system you could do worse than to implement these. </p><p> If a system is to be considered secure, it had better have a reasonably secure '<span class="emphasis"><em>other</em></span> entry. The following is a paranoid setting (which is not a bad place to start!): </p><pre class="programlisting"> # # default; deny access # other auth required pam_deny.so other account required pam_deny.so other password required pam_deny.so other session required pam_deny.so </pre><p> Whilst fundamentally a secure default, this is not very sympathetic to a misconfigured system. For example, such a system is vulnerable to locking everyone out should the rest of the file become badly written. </p><p> The module <span class="command"><strong>pam_deny</strong></span> (documented in a <a class="link" href="sag-pam_deny.html" title="6.4. pam_deny - locking-out PAM module">later section</a>) is not very sophisticated. For example, it logs no information when it is invoked so unless the users of a system contact the administrator when failing to execute a service application, the administrator may go for a long while in ignorance of the fact that his system is misconfigured. </p><p> The addition of the following line before those in the above example would provide a suitable warning to the administrator. </p><pre class="programlisting"> # # default; wake up! This application is not configured # other auth required pam_warn.so other password required pam_warn.so </pre><p> Having two '<span class="command"><strong>other auth</strong></span>' lines is an example of stacking. </p><p> On a system that uses the <code class="filename">/etc/pam.d/</code> configuration, the corresponding default setup would be achieved with the following file: </p><pre class="programlisting"> # # default configuration: /etc/pam.d/other # auth required pam_warn.so auth required pam_deny.so account required pam_deny.so password required pam_warn.so password required pam_deny.so session required pam_deny.so </pre><p> This is the only explicit example we give for an <code class="filename">/etc/pam.d/</code> file. In general, it should be clear how to transpose the remaining examples to this configuration scheme. </p><p> On a less sensitive computer, one on which the system administrator wishes to remain ignorant of much of the power of <span class="emphasis"><em>Linux-PAM</em></span>, the following selection of lines (in <code class="filename">/etc/pam.d/other</code>) is likely to mimic the historically familiar Linux setup. </p><pre class="programlisting"> # # default; standard UN*X access # auth required pam_unix.so account required pam_unix.so password required pam_unix.so session required pam_unix.so </pre><p> In general this will provide a starting place for most applications. </p></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="sag-configuration-directory.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="sag-configuration.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="sag-security-issues.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">4.2. Directory based configuration </td><td width="20%" align="center"><a accesskey="h" href="Linux-PAM_SAG.html">Home</a></td><td width="40%" align="right" valign="top"> Chapter 5. Security issues</td></tr></table></div></body></html>
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