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<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.1.2//EN"
"http://www.oasis-open.org/docbook/xml/4.1.2/docbookx.dtd">
<refentry id='pam_env'>
<refmeta>
<refentrytitle>pam_env</refentrytitle>
<manvolnum>8</manvolnum>
<refmiscinfo class='setdesc'>Linux-PAM Manual</refmiscinfo>
</refmeta>
<refnamediv id='pam_env-name'>
<refname>pam_env</refname>
<refpurpose>
PAM module to set/unset environment variables
</refpurpose>
</refnamediv>
<!-- body begins here -->
<refsynopsisdiv>
<cmdsynopsis id="pam_env-cmdsynopsis">
<command>pam_env.so</command>
<arg choice="opt">
debug
</arg>
<arg choice="opt">
conffile=<replaceable>conf-file</replaceable>
</arg>
<arg choice="opt">
envfile=<replaceable>env-file</replaceable>
</arg>
<arg choice="opt">
readenv=<replaceable>0|1</replaceable>
</arg>
<arg choice="opt">
user_envfile=<replaceable>env-file</replaceable>
</arg>
<arg choice="opt">
user_readenv=<replaceable>0|1</replaceable>
</arg>
</cmdsynopsis>
</refsynopsisdiv>
<refsect1 id="pam_env-description">
<title>DESCRIPTION</title>
<para>
The pam_env PAM module allows the (un)setting of environment
variables. Supported is the use of previously set environment
variables as well as <emphasis>PAM_ITEM</emphasis>s such as
<emphasis>PAM_RHOST</emphasis>.
</para>
<para>
By default rules for (un)setting of variables are taken from the
config file <filename>/etc/security/pam_env.conf</filename>. An
alternate file can be specified with the <emphasis>conffile</emphasis>
option.
</para>
<para>
Second a file (<filename>/etc/environment</filename> by default) with simple
<emphasis>KEY=VAL</emphasis> pairs on separate lines will be read.
With the <emphasis>envfile</emphasis> option an alternate file can be specified.
And with the <emphasis>readenv</emphasis> option this can be completely disabled.
</para>
<para>
Third it will read a user configuration file
(<filename>$HOME/.pam_environment</filename> by default).
The default file can be changed with the
<emphasis>user_envfile</emphasis> option
and it can be turned on and off with the <emphasis>user_readenv</emphasis> option.
</para>
<para>
Since setting of PAM environment variables can have side effects
to other modules, this module should be the last one on the stack.
</para>
</refsect1>
<refsect1 id="pam_env-options">
<title>OPTIONS</title>
<variablelist>
<varlistentry>
<term>
<option>conffile=<replaceable>/path/to/pam_env.conf</replaceable></option>
</term>
<listitem>
<para>
Indicate an alternative <filename>pam_env.conf</filename>
style configuration file to override the default. This can
be useful when different services need different environments.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<option>debug</option>
</term>
<listitem>
<para>
A lot of debug information is printed with
<citerefentry><refentrytitle>syslog</refentrytitle><manvolnum>3</manvolnum></citerefentry>.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<option>envfile=<replaceable>/path/to/environment</replaceable></option>
</term>
<listitem>
<para>
Indicate an alternative <filename>environment</filename>
file to override the default. The syntax are simple
<emphasis>KEY=VAL</emphasis> pairs on separate lines. The
<emphasis>export</emphasis> instruction can be specified for bash
compatibility, but will be ignored.
This can be useful when different services need different environments.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<option>readenv=<replaceable>0|1</replaceable></option>
</term>
<listitem>
<para>
Turns on or off the reading of the file specified by envfile
(0 is off, 1 is on). By default this option is on.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<option>user_envfile=<replaceable>filename</replaceable></option>
</term>
<listitem>
<para>
Indicate an alternative <filename>.pam_environment</filename>
file to override the default.The syntax is the same as
for <emphasis>/etc/security/pam_env.conf</emphasis>.
The filename is relative to the user home directory.
This can be useful when different services need different
environments.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>
<option>user_readenv=<replaceable>0|1</replaceable></option>
</term>
<listitem>
<para>
Turns on or off the reading of the user specific environment
file. 0 is off, 1 is on. By default this option is off as user
supplied environment variables in the PAM environment could affect
behavior of subsequent modules in the stack without the consent
of the system administrator.
</para>
<para>
Due to problematic security this functionality is deprecated
since the 1.5.0 version and will be removed completely at some
point in the future.
</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1 id="pam_env-types">
<title>MODULE TYPES PROVIDED</title>
<para>
The <option>auth</option> and <option>session</option> module
types are provided.
</para>
</refsect1>
<refsect1 id="pam_env-return_values">
<title>RETURN VALUES</title>
<variablelist>
<varlistentry>
<term>PAM_ABORT</term>
<listitem>
<para>
Not all relevant data or options could be gotten.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>PAM_BUF_ERR</term>
<listitem>
<para>
Memory buffer error.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>PAM_IGNORE</term>
<listitem>
<para>
No pam_env.conf and environment file was found.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term>PAM_SUCCESS</term>
<listitem>
<para>
Environment variables were set.
</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1 id="pam_env-files">
<title>FILES</title>
<variablelist>
<varlistentry>
<term><filename>/etc/security/pam_env.conf</filename></term>
<listitem>
<para>Default configuration file</para>
</listitem>
</varlistentry>
<varlistentry>
<term><filename>/etc/environment</filename></term>
<listitem>
<para>Default environment file</para>
</listitem>
</varlistentry>
<varlistentry>
<term><filename>$HOME/.pam_environment</filename></term>
<listitem>
<para>User specific environment file</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1 id="pam_env-see_also">
<title>SEE ALSO</title>
<para>
<citerefentry>
<refentrytitle>pam_env.conf</refentrytitle><manvolnum>5</manvolnum>
</citerefentry>,
<citerefentry>
<refentrytitle>pam.d</refentrytitle><manvolnum>5</manvolnum>
</citerefentry>,
<citerefentry>
<refentrytitle>pam</refentrytitle><manvolnum>8</manvolnum>
</citerefentry>,
<citerefentry>
<refentrytitle>environ</refentrytitle><manvolnum>7</manvolnum>
</citerefentry>.
</para>
</refsect1>
<refsect1 id="pam_env-authors">
<title>AUTHOR</title>
<para>
pam_env was written by Dave Kinchlea <kinch@kinch.ark.com>.
</para>
</refsect1>
</refentry>
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