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<?xml version="1.0" encoding='UTF-8'?>
<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN"
"http://www.oasis-open.org/docbook/xml/4.3/docbookx.dtd">
<refentry id="pam_exec">
<refmeta>
<refentrytitle>pam_exec</refentrytitle>
<manvolnum>8</manvolnum>
<refmiscinfo class="sectdesc">Linux-PAM Manual</refmiscinfo>
</refmeta>
<refnamediv id="pam_exec-name">
<refname>pam_exec</refname>
<refpurpose>PAM module which calls an external command</refpurpose>
</refnamediv>
<refsynopsisdiv>
<cmdsynopsis id="pam_exec-cmdsynopsis">
<command>pam_exec.so</command>
<arg choice="opt">
debug
</arg>
<arg choice="opt">
seteuid
</arg>
<arg choice="opt">
quiet
</arg>
<arg choice="opt">
log=<replaceable>file</replaceable>
</arg>
<arg choice="plain">
<replaceable>command</replaceable>
</arg>
<arg choice="opt">
<replaceable>...</replaceable>
</arg>
</cmdsynopsis>
</refsynopsisdiv>
<refsect1 id="pam_exec-description">
<title>DESCRIPTION</title>
<para>
pam_exec is a PAM module that can be used to run
an external command.
</para>
<para>
The child's environment is set to the current PAM environment list, as
returned by
<citerefentry>
<refentrytitle>pam_getenvlist</refentrytitle><manvolnum>3</manvolnum>
</citerefentry>
In addition, the following PAM items are
exported as environment variables: <emphasis>PAM_RHOST</emphasis>,
<emphasis>PAM_RUSER</emphasis>, <emphasis>PAM_SERVICE</emphasis>,
<emphasis>PAM_TTY</emphasis>, and <emphasis>PAM_USER</emphasis>.
</para>
</refsect1>
<refsect1 id="pam_exec-options">
<title>OPTIONS</title>
<para>
<variablelist>
<varlistentry>
<term>
<option>debug</option>
</term>
<listitem>
<para>
Print debug information.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<option>log=<replaceable>file</replaceable></option>
</term>
<listitem>
<para>
The output of the command is appended to
<filename>file</filename>
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<option>quiet</option>
</term>
<listitem>
<para>
Per default pam_exec.so will echo the exit status of the
external command if it fails.
Specifying this option will suppress the message.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<option>seteuid</option>
</term>
<listitem>
<para>
Per default pam_exec.so will execute the external command
with the real user ID of the calling process.
Specifying this option means the command is run
with the effective user ID.
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect1>
<refsect1 id="pam_exec-services">
<title>MODULE SERVICES PROVIDED</title>
<para>
The services <option>auth</option>, <option>account</option>,
<option>password</option> and <option>session</option> are supported.
</para>
</refsect1>
<refsect1 id='pam_exec-return_values'>
<title>RETURN VALUES</title>
<para>
<variablelist>
<varlistentry>
<term>PAM_SUCCESS</term>
<listitem>
<para>
The external command runs successfull.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>PAM_SERVICE_ERR</term>
<listitem>
<para>
No argument or a wrong number of arguments were given.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>PAM_SYSTEM_ERR</term>
<listitem>
<para>
A system error occured or the command to execute failed.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>PAM_IGNORE</term>
<listitem>
<para>
<function>pam_setcred</function> was called, which
does not execute the command.
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect1>
<refsect1 id='pam_exec-examples'>
<title>EXAMPLES</title>
<para>
Add the following line to <filename>/etc/pam.d/passwd</filename> to
rebuild the NIS database after each local password change:
<programlisting>
passwd optional pam_exec.so seteuid make -C /var/yp
</programlisting>
This will execute the command
<programlisting>make -C /var/yp</programlisting>
with effective user ID.
</para>
</refsect1>
<refsect1 id='pam_exec-see_also'>
<title>SEE ALSO</title>
<para>
<citerefentry>
<refentrytitle>pam.conf</refentrytitle><manvolnum>5</manvolnum>
</citerefentry>,
<citerefentry>
<refentrytitle>pam.d</refentrytitle><manvolnum>8</manvolnum>
</citerefentry>,
<citerefentry>
<refentrytitle>pam</refentrytitle><manvolnum>8</manvolnum>
</citerefentry>
</para>
</refsect1>
<refsect1 id='pam_exec-author'>
<title>AUTHOR</title>
<para>
pam_exec was written by Thorsten Kukuk <kukuk@thkukuk.de>.
</para>
</refsect1>
</refentry>
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