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plugin-runner.xml
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<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
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        "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
 
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<!ENTITY VERSION "1.0">
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<!ENTITY COMMANDNAME "plugin-runner">
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<!ENTITY TIMESTAMP "2023-04-30">
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<!ENTITY % common SYSTEM "common.ent">
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%common;
 
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<!ENTITY TIMESTAMP "2008-09-04">
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]>
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<refentry xmlns:xi="http://www.w3.org/2001/XInclude">
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    <title>Mandos Manual</title>
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    <!-- Nwalsh’s docbook scripts use this to generate the footer: -->
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    <productname>Mandos</productname>
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    <productnumber>&version;</productnumber>
 
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    <productnumber>&VERSION;</productnumber>
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    <date>&TIMESTAMP;</date>
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    <authorgroup>
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      <author>
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        <firstname>Björn</firstname>
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        <surname>Påhlsson</surname>
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        <address>
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          <email>belorn@recompile.se</email>
 
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          <email>belorn@fukt.bsnet.se</email>
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        </address>
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      </author>
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      <author>
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        <firstname>Teddy</firstname>
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        <surname>Hogeborn</surname>
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        <address>
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          <email>teddy@recompile.se</email>
 
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          <email>teddy@fukt.bsnet.se</email>
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        </address>
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      </author>
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    </authorgroup>
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    <copyright>
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      <year>2008</year>
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      <year>2009</year>
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      <year>2010</year>
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      <year>2011</year>
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      <year>2012</year>
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      <year>2013</year>
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      <year>2014</year>
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      <year>2015</year>
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      <year>2016</year>
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      <year>2017</year>
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      <year>2018</year>
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      <year>2019</year>
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      <holder>Teddy Hogeborn</holder>
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      <holder>Björn Påhlsson</holder>
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    </copyright>
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    <xi:include href="legalnotice.xml"/>
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  </refentryinfo>
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  <refmeta>
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    <refentrytitle>&COMMANDNAME;</refentrytitle>
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    <manvolnum>8mandos</manvolnum>
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      Run Mandos plugins, pass data from first to succeed.
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    </refpurpose>
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  </refnamediv>
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  <refsynopsisdiv>
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    <cmdsynopsis>
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      <command>&COMMANDNAME;</command>
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      <group rep="repeat">
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        <arg choice="plain"><option>--global-env=<replaceable
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        >ENV</replaceable><literal>=</literal><replaceable
 
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        >VAR</replaceable><literal>=</literal><replaceable
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        >value</replaceable></option></arg>
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        <arg choice="plain"><option>-G
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        <replaceable>ENV</replaceable><literal>=</literal><replaceable
 
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        <replaceable>VAR</replaceable><literal>=</literal><replaceable
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        >value</replaceable> </option></arg>
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      </group>
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      <sbr/>
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      <arg><option>--plugin-dir=<replaceable
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      >DIRECTORY</replaceable></option></arg>
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      <sbr/>
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      <arg><option>--plugin-helper-dir=<replaceable
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      >DIRECTORY</replaceable></option></arg>
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      <sbr/>
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      <arg><option>--config-file=<replaceable
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      >FILE</replaceable></option></arg>
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      <sbr/>
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    <variablelist>
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      <varlistentry>
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        <term><option>--global-env
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        <replaceable>ENV</replaceable><literal>=</literal><replaceable
 
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        <replaceable>VAR</replaceable><literal>=</literal><replaceable
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        >value</replaceable></option></term>
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        <term><option>-G
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        <replaceable>ENV</replaceable><literal>=</literal><replaceable
 
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        <replaceable>VAR</replaceable><literal>=</literal><replaceable
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        >value</replaceable></option></term>
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        <listitem>
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          <para>
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          </para>
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        </listitem>
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      </varlistentry>
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      <varlistentry>
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        <term><option>--disable
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        <replaceable>PLUGIN</replaceable></option></term>
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            Disable the plugin named
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            <replaceable>PLUGIN</replaceable>.  The plugin will not be
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            started.
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          </para>
 
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          </para>       
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        </listitem>
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      </varlistentry>
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      <varlistentry>
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        <term><option>--enable
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        <replaceable>PLUGIN</replaceable></option></term>
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          </para>
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        </listitem>
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      </varlistentry>
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      <varlistentry>
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        <term><option>--groupid
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        <replaceable>ID</replaceable></option></term>
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          </para>
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        </listitem>
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      </varlistentry>
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      <varlistentry>
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        <term><option>--userid
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        <replaceable>ID</replaceable></option></term>
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          </para>
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        </listitem>
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      </varlistentry>
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      <varlistentry>
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        <term><option>--plugin-dir
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        <replaceable>DIRECTORY</replaceable></option></term>
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      </varlistentry>
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      <varlistentry>
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        <term><option>--plugin-helper-dir
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        <replaceable>DIRECTORY</replaceable></option></term>
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        <listitem>
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          <para>
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            Specify a different plugin helper directory.  The default
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            is <filename>/lib/mandos/plugin-helpers</filename>, which
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            will exist in the initial <acronym>RAM</acronym> disk
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            environment.  (This will simply be passed to all plugins
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            via the <envar>MANDOSPLUGINHELPERDIR</envar> environment
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            variable.  See <xref linkend="writing_plugins"/>)
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          </para>
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        </listitem>
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      </varlistentry>
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      <varlistentry>
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        <term><option>--config-file
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        <replaceable>FILE</replaceable></option></term>
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        <listitem>
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          </para>
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        </listitem>
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      </varlistentry>
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      <varlistentry>
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        <term><option>--version</option></term>
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        <term><option>-V</option></term>
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      </varlistentry>
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    </variablelist>
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  </refsect1>
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  <refsect1 id="overview">
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    <title>OVERVIEW</title>
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    <xi:include href="overview.xml"/>
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    <title>PLUGINS</title>
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    <para>
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      This program will get a password by running a number of
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      <firstterm>plugins</firstterm>, which are executable programs in
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      a directory in the initial <acronym>RAM</acronym> disk
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      environment.  The default directory is
 
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      <firstterm>plugins</firstterm>, which are simply executable
 
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      programs in a directory in the initial <acronym>RAM</acronym>
 
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      disk environment.  The default directory is
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      <filename>/lib/mandos/plugins.d</filename>, but this can be
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      changed with the <option>--plugin-dir</option> option.  The
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      plugins are started in parallel, and the first plugin to output
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      code will make this plugin-runner output the password from that
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      plugin, stop any other plugins, and exit.
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    </para>
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    <refsect2 id="writing_plugins">
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      <title>WRITING PLUGINS</title>
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      <para>
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        A plugin is an executable program which prints a password to
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        its standard output and then exits with a successful (zero)
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        exit status.  If the exit status is not zero, any output on
 
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        A plugin is simply a program which prints a password to its
 
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        standard output and then exits with a successful (zero) exit
 
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        status.  If the exit status is not zero, any output on
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        standard output will be ignored by the plugin runner.  Any
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        output on its standard error channel will simply be passed to
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        the standard error of the plugin runner, usually the system
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        console.
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      </para>
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      <para>
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        If the password is a single-line, manually entered passprase,
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        a final trailing newline character should
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        <emphasis>not</emphasis> be printed.
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      </para>
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      <para>
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        The plugin will run in the initial RAM disk environment, so
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        care must be taken not to depend on any files or running
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        services not available there.  Any helper executables required
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        by the plugin (which are not in the <envar>PATH</envar>) can
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        be placed in the plugin helper directory, the name of which
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        will be made available to the plugin via the
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        <envar>MANDOSPLUGINHELPERDIR</envar> environment variable.
 
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        services not available there.
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      </para>
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      <para>
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        The plugin must exit cleanly and free all allocated resources
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      only passes on its environment to all the plugins.  The
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      environment passed to plugins can be modified using the
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      <option>--global-env</option> and <option>--env-for</option>
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      options.  Also, the <option>--plugin-helper-dir</option> option
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      will affect the environment variable
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      <envar>MANDOSPLUGINHELPERDIR</envar> for the plugins.
 
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      options.
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    </para>
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  </refsect1>
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            </para>
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          </listitem>
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        </varlistentry>
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        <varlistentry>
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          <term><filename class="directory"
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          >/lib/mandos/plugins.d</filename></term>
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          <listitem>
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            <para>
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              The default plugin directory; can be changed by the
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              <option>--plugin-dir</option> option.
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            </para>
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          </listitem>
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        </varlistentry>
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        <varlistentry>
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          <term><filename class="directory"
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          >/lib/mandos/plugin-helpers</filename></term>
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          <listitem>
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            <para>
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              The default plugin helper directory; can be changed by
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              the <option>--plugin-helper-dir</option> option.
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            </para>
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          </listitem>
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        </varlistentry>
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      </variablelist>
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    </para>
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  </refsect1>
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      The <option>--config-file</option> option is ignored when
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      specified from within a configuration file.
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    </para>
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    <xi:include href="bugs.xml"/>
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  </refsect1>
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  <refsect1 id="examples">
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    </informalexample>
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    <informalexample>
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      <para>
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        Read a different configuration file, run plugins from a
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        different directory, specify an alternate plugin helper
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        directory and add four options to the
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        <citerefentry><refentrytitle >mandos-client</refentrytitle>
 
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        Run plugins from a different directory and add two
 
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        options to the <citerefentry><refentrytitle
 
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        >password-request</refentrytitle>
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        <manvolnum>8mandos</manvolnum></citerefentry> plugin:
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      </para>
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      <para>
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<!-- do not wrap this line -->
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<userinput>cd /etc/keys/mandos; &COMMANDNAME;  --config-file=/etc/mandos/plugin-runner.conf --plugin-dir /usr/lib/x86_64-linux-gnu/mandos/plugins.d --plugin-helper-dir /usr/lib/x86_64-linux-gnu/mandos/plugin-helpers --options-for=mandos-client:--pubkey=pubkey.txt,&#x200b;--seckey=seckey.txt,&#x200b;--tls-pubkey=tls-pubkey.pem,&#x200b;--tls-privkey=tls-privkey.pem</userinput>
 
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<userinput>&COMMANDNAME;  --plugin-dir=plugins.d --options-for=password-request:--pubkey=keydir/pubkey.txt,--seckey=keydir/seckey.txt</userinput>
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      </para>
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    </informalexample>
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      non-privileged.  This user and group is then what all plugins
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      will be started as.  Therefore, the only way to run a plugin as
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      a privileged user is to have the set-user-ID or set-group-ID bit
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      set on the plugin executable file (see <citerefentry>
 
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      set on the plugin executable files (see <citerefentry>
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      <refentrytitle>execve</refentrytitle><manvolnum>2</manvolnum>
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      </citerefentry>).
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    </para>
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  <refsect1 id="see_also">
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    <title>SEE ALSO</title>
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    <para>
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      <citerefentry><refentrytitle>intro</refentrytitle>
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      <manvolnum>8mandos</manvolnum></citerefentry>,
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      <citerefentry><refentrytitle>cryptsetup</refentrytitle>
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      <manvolnum>8</manvolnum></citerefentry>,
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      <citerefentry><refentrytitle>crypttab</refentrytitle>
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      <manvolnum>8</manvolnum></citerefentry>,
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      <citerefentry><refentrytitle>password-prompt</refentrytitle>
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      <manvolnum>8mandos</manvolnum></citerefentry>,
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      <citerefentry><refentrytitle>mandos-client</refentrytitle>
 
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      <citerefentry><refentrytitle>password-request</refentrytitle>
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      <manvolnum>8mandos</manvolnum></citerefentry>
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    </para>
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  </refsect1>