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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 COMMANDNAME "password-agent">
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<!ENTITY TIMESTAMP "2019-07-24">
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<!ENTITY % common SYSTEM "../common.ent">
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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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<date>&TIMESTAMP;</date>
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<firstname>Björn</firstname>
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<surname>Påhlsson</surname>
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<email>belorn@recompile.se</email>
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<firstname>Teddy</firstname>
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<surname>Hogeborn</surname>
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<email>teddy@recompile.se</email>
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<holder>Teddy Hogeborn</holder>
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<holder>Björn Påhlsson</holder>
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<xi:include href="../legalnotice.xml"/>
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<refentrytitle>&COMMANDNAME;</refentrytitle>
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<manvolnum>8mandos</manvolnum>
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<refname><command>&COMMANDNAME;</command></refname>
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Run Mandos client as a systemd password agent.
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<command>&COMMANDNAME;</command>
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<arg><option>--agent-directory=<replaceable
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>DIRECTORY</replaceable></option></arg>
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<arg><option>--helper-directory=<replaceable
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>DIRECTORY</replaceable></option></arg>
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<!-- <arg><option>-\-plugin-helper-dir=<replaceable -->
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<!-- >DIRECTORY</replaceable></option></arg> -->
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<arg><option>--user=<replaceable
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>USERID</replaceable></option></arg>
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<!-- <arg><option>-\-userid=<replaceable -->
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<!-- >ID</replaceable></option></arg> -->
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<arg><option>--group=<replaceable
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>GROUPID</replaceable></option></arg>
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<!-- <arg><option>-\-groupid=<replaceable -->
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<!-- >ID</replaceable></option></arg> -->
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<replaceable>MANDOS_CLIENT</replaceable>
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<arg choice="plain"><replaceable>OPTIONS</replaceable></arg>
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<command>&COMMANDNAME;</command>
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<arg choice="plain"><option>--test</option></arg>
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<command>&COMMANDNAME;</command>
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<arg choice="plain"><option>--help</option></arg>
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<arg choice="plain"><option>-?</option></arg>
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<command>&COMMANDNAME;</command>
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<arg choice="plain"><option>--usage</option></arg>
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<command>&COMMANDNAME;</command>
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<arg choice="plain"><option>--version</option></arg>
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<arg choice="plain"><option>-V</option></arg>
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<refsect1 id="description">
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<title>DESCRIPTION</title>
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<command>&COMMANDNAME;</command> is a program which is meant to
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be a <citerefentry><refentrytitle>systemd</refentrytitle>
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<manvolnum>1</manvolnum></citerefentry> <quote>Password
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Agent</quote> (See <ulink
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url="https://www.freedesktop.org/wiki/Software/systemd/PasswordAgents/"
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>Password Agents</ulink>). The aim of this program is therefore
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to acquire and then send a password to some other program which
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will use the password to unlock the encrypted root disk.
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This program is not meant to be invoked directly, but can be in
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<refsect1 id="purpose">
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<title>PURPOSE</title>
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The purpose of this is to enable <emphasis>remote and unattended
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rebooting</emphasis> of client host computer with an
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<emphasis>encrypted root file system</emphasis>. See <xref
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linkend="overview"/> for details.
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<title>OPTIONS</title>
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<term><option>--agent-directory
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<replaceable>DIRECTORY</replaceable></option></term>
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Specify a different agent directory. The default is
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<quote><filename class="directory"
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>/run/systemd/ask-password</filename ></quote> as per the
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url="https://www.freedesktop.org/wiki/Software/systemd/PasswordAgents/"
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>Password Agents</ulink> specification.
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<term><option>--helper-directory
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<replaceable>DIRECTORY</replaceable></option></term>
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Specify a different helper directory. The default is
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<quote><filename class="directory"
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>/lib/mandos/plugin-helpers</filename
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will exist in the initial <acronym>RAM</acronym> disk
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environment. (This will simply be passed to the
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<replaceable>MANDOS_CLIENT</replaceable> program via the
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<envar>MANDOSPLUGINHELPERDIR</envar> environment variable.
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<citerefentry><refentrytitle>mandos-client</refentrytitle
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><manvolnum>8mandos</manvolnum></citerefentry>.)
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<replaceable>USERID</replaceable></option></term>
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Change real user ID to <replaceable>USERID</replaceable>
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when running <replaceable>MANDOS_CLIENT</replaceable>.
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The default is 65534. <emphasis>Note:</emphasis> This
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must be a number, not a name.
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<term><option>--group
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<replaceable>GROUPID</replaceable></option></term>
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Change real group ID to <replaceable>GROUPID</replaceable>
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when running <replaceable>MANDOS_CLIENT</replaceable>.
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The default is 65534. <emphasis>Note:</emphasis> This
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must be a number, not a name.
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<term><replaceable>MANDOS_CLIENT</replaceable></term>
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This specifies the file name for
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<citerefentry><refentrytitle>mandos-client</refentrytitle
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><manvolnum>8mandos</manvolnum></citerefentry>. If the
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<quote><option>--</option></quote> option is given, any
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following options are passed to the <replaceable
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>MANDOS_CLIENT</replaceable> program. The default is
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>/lib/mandos/plugins.d/mandos-client</filename ></quote>
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(which is the correct location for the initial
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<acronym>RAM</acronym> disk environment) without any
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<term><option>--help</option></term>
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<term><option>-?</option></term>
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Gives a help message about options and their meanings.
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<term><option>--test</option></term>
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Ignore normal operation; instead only run self-tests.
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Adding the <option>--help</option> option may show more
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options possible in combination with
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<option>--test</option>.
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<term><option>--usage</option></term>
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Gives a short usage message.
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<term><option>--version</option></term>
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<term><option>-V</option></term>
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Prints the program version.
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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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This program, &COMMANDNAME;, will run on the client side in the
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initial <acronym>RAM</acronym> disk environment, and is
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responsible for getting a password from the Mandos client
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program itself, and to send that password to whatever is
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currently asking for a password using the systemd <ulink
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url="https://www.freedesktop.org/wiki/Software/systemd/PasswordAgents/"
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>Password Agents</ulink> mechanism.
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<para>To accomplish this, &COMMANDNAME; runs the
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<command>mandos-client</command> program (which is the actual
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client program communicating with the Mandos server) or,
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alternatively, any executable file specified as
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<replaceable>MANDOS_CLIENT</replaceable>, and, as soon as a
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password is acquired from the
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<replaceable>MANDOS_CLIENT</replaceable> program, sends that
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password (as per the <ulink
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url="https://www.freedesktop.org/wiki/Software/systemd/PasswordAgents/"
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>Password Agents</ulink> specification) to all currently
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unanswered password questions.
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This program should be started (normally as a systemd service,
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which in turn is normally started by a <citerefentry
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><refentrytitle>systemd.path</refentrytitle>
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<manvolnum>5</manvolnum></citerefentry> file) as a reaction to
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files named <quote><filename>ask.<replaceable>xxxx</replaceable
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></filename></quote> appearing in the agent directory
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class="directory">/run/systemd/ask-password</filename></quote>
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(or the directory specified by
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<option>--agent-directory</option>).
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<refsect1 id="exit_status">
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<title>EXIT STATUS</title>
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Exit status of this program is zero if no errors were
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encountered, and otherwise not.
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<refsect1 id="environment">
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<title>ENVIRONMENT</title>
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This program does not use any environment variables itself, it
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only passes on its environment to
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<replaceable>MANDOS_CLIENT</replaceable>. Also, the
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<option>--helper-directory</option> option will affect the
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environment variable <envar>MANDOSPLUGINHELPERDIR</envar> for
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<replaceable>MANDOS_CLIENT</replaceable>.
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<refsect1 id="files">
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<term><filename class="directory"
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>/run/systemd/ask-password</filename></term>
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The default directory to watch for password questions as
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url="https://www.freedesktop.org/wiki/Software/systemd/PasswordAgents/"
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>Password Agents</ulink> specification; can be changed
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by the <option>--agent-directory</option> option.
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<term><filename class="directory"
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>/lib/mandos/plugin-helpers</filename
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The helper directory as supplied to
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<replaceable>MANDOS_CLIENT</replaceable> via the
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<envar>MANDOSPLUGINHELPERDIR</envar> environment
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variable; can be changed by the
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<option>--helper-directory</option> option.
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<xi:include href="../bugs.xml"/>
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<refsect1 id="examples">
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<title>EXAMPLE</title>
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Normal invocation needs no options:
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<userinput>&COMMANDNAME;</userinput>
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Run an alternative <replaceable>MANDOS_CLIENT</replaceable>
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<userinput>&COMMANDNAME; /usr/local/sbin/alternate</userinput>
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Use alternative locations for the helper directory and the
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Mandos client, and add extra options suitable for running in
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the normal file system:
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<!-- do not wrap this line -->
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<userinput>&COMMANDNAME; --helper-directory=/usr/lib/x86_64-linux-gnu/mandos/plugin-helpers -- /usr/lib/x86_64-linux-gnu/mandos/plugins.d/mandos-client --pubkey=/etc/keys/mandos/pubkey.txt --seckey=/etc/keys/mandos/seckey.txt --tls-pubkey=/etc/keys/mandos/tls-pubkey.pem --tls-privkey=/etc/keys/mandos/tls-privkey.pem</userinput>
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Use the default location for
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<citerefentry><refentrytitle>mandos-client</refentrytitle>
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<manvolnum>8mandos</manvolnum></citerefentry>, but add many
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<!-- do not wrap this line -->
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<userinput>&COMMANDNAME; -- /lib/mandos/mandos-client --pubkey=/etc/mandos/keys/pubkey.txt --seckey=/etc/mandos/keys/seckey.txt --tls-pubkey=/etc/mandos/keys/tls-pubkey.pem --tls-privkey=/etc/mandos/keys/tls-privkey.pem</userinput>
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Only run the self-tests:
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<userinput>&COMMANDNAME; --test</userinput>
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<refsect1 id="security">
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<title>SECURITY</title>
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This program will need to run as the root user in order to read
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the agent directory and the <quote><filename
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>ask.<replaceable>xxxx</replaceable></filename></quote> files
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there, and will, when starting the Mandos client program,
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require the ability to set the <quote>real</quote> user and
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group ids to another user, by default user and group 65534,
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which are assumed to be non-privileged. This is done in order
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to match the expectations of <citerefentry><refentrytitle
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>mandos-client</refentrytitle><manvolnum>8mandos</manvolnum
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></citerefentry>, which assumes that its executable file is
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owned by the root user and also has the set-user-ID bit set (see
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<citerefentry><refentrytitle>execve</refentrytitle><manvolnum
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>2</manvolnum></citerefentry>).
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<refsect1 id="see_also">
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<title>SEE ALSO</title>
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<citerefentry><refentrytitle>intro</refentrytitle>
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<manvolnum>8mandos</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>mandos-client</refentrytitle>
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<manvolnum>8mandos</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemd</refentrytitle>
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<manvolnum>1</manvolnum></citerefentry>,
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url="https://www.freedesktop.org/wiki/Software/systemd/PasswordAgents/"
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>Password Agents</ulink>
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The specification for systemd <quote>Password
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Agent</quote> programs, which
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<command>&COMMANDNAME;</command> follows.
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dracut-module/password-agent.xml
