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  • Committer: Teddy Hogeborn
  • Date: 2019-03-31 04:39:25 UTC
  • Revision ID: teddy@recompile.se-20190331043925-0j9pdspo3hux5nka
mandos-ctl: Refactor: Move command list generation into argparse

* mandos-ctl (add_command_line_options): Don't simply set flags for
                                         each option; instead, add
                                         command objects to a
                                         "commands" list.
  (check_option_syntax): Rework to deal with an already-generated
                         command list.
  (commands_from_options): Remove all code to generate command list,
                           but add more code to move command.Deny
                           ahead of command.Remove in command list.
  (command.PropertySetterValue.argparse): New; used in
                                          add_command_line_options.
  (Test_check_option_syntax): Refactor to pass actual string arguments
                              to parse_args() instead of modifying an
                              argparse.Namespace.

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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 "2008-09-04">
 
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<!ENTITY TIMESTAMP "2019-02-10">
 
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<!ENTITY % common SYSTEM "common.ent">
 
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%common;
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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@fukt.bsnet.se</email>
 
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          <email>belorn@recompile.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@fukt.bsnet.se</email>
 
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          <email>teddy@recompile.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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  <refnamediv>
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    <refname><command>&COMMANDNAME;</command></refname>
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    <refpurpose>
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      Run Mandos plugins.  Pass data from first succesful one.
 
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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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        >VAR</replaceable><literal>=</literal><replaceable
 
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        >ENV</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>VAR</replaceable><literal>=</literal><replaceable
 
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        <replaceable>ENV</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>VAR</replaceable><literal>=</literal><replaceable
 
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        <replaceable>ENV</replaceable><literal>=</literal><replaceable
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        >value</replaceable></option></term>
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        <term><option>-G
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        <replaceable>VAR</replaceable><literal>=</literal><replaceable
 
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        <replaceable>ENV</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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            Re-enable the plugin named
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            <replaceable>PLUGIN</replaceable>.  This is only useful to
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            undo a previous <option>--disable</option> option, maybe
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            from the config file.
 
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            from the configuration file.
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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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      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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        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.
 
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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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      </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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      optins.
 
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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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    </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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<!--   <refsect1 id="bugs"> -->
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<!--     <title>BUGS</title> -->
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<!--     <para> -->
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<!--     </para> -->
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<!--   </refsect1> -->
 
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  <refsect1 id="bugs">
 
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    <title>BUGS</title>
 
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    <para>
 
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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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    <title>EXAMPLE</title>
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    </informalexample>
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    <informalexample>
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      <para>
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        Run plugins from a different directory and add a special
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        option to the <citerefentry><refentrytitle
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        >password-request</refentrytitle>
 
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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 two options to the
 
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        <citerefentry><refentrytitle >mandos-client</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>&COMMANDNAME;  --plugin-dir=plugins.d --options-for=password-request:--keydir=keydir</userinput>
 
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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,--seckey=seckey.txt,--tls-pubkey=tls-pubkey.pem,--tls-privkey=tls-privkey.pem</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 files (see <citerefentry>
 
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      set on the plugin executable file (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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    <para>
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      If this program is used as a keyscript in <citerefentry
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      ><refentrytitle>crypttab</refentrytitle><manvolnum>5</manvolnum>
594
 
      </citerefentry>, there is a risk that if this program fails to
595
 
      work, there might be no way to boot the system except for
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      booting from another media and editing the initial RAM disk
 
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      </citerefentry>, there is a slight risk that if this program
 
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      fails to work, there might be no way to boot the system except
 
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      for booting from another media and editing the initial RAM disk
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      image to not run this program.  This is, however, unlikely,
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      since the <citerefentry><refentrytitle
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      >password-prompt</refentrytitle><manvolnum>8mandos</manvolnum>
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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>,
621
 
      <citerefentry><refentrytitle>password-request</refentrytitle>
 
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      <citerefentry><refentrytitle>mandos-client</refentrytitle>
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      <manvolnum>8mandos</manvolnum></citerefentry>
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    </para>
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  </refsect1>