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  • Committer: teddy at recompile
  • Date: 2012-02-26 11:47:19 UTC
  • mto: This revision was merged to the branch mainline in revision 561.
  • Revision ID: teddy@recompile.se-20120226114719-m3odq4s34ebt6hg8
Add facilities for D-Bus interface annotations and use them to mark
the old D-Bus interfaces as deprecated.

* mandos (dbus_interface_annotations): New decorator.
  (DBusObjectWithProperties._is_dbus_property): Removed.  All callers
                                                changed.
  (DBusObjectWithProperties._is_dbus_thing): New; generalized version
                                             of "_is_dbus_property".
  (DBusObjectWithProperties._get_all_dbus_properties): Removed.  All
                                                       callers
                                                       changed.
  (DBusObjectWithProperties._get_all_dbus_things): New; generalized
                                                   version of
                                                   "_get_all_dbus_properties".
  (DBusObjectWithProperties.Introspect): Also add interface
                                         annotation tags.
  (AlternateDBusNamesMetaclass.__new__): Also copy interface
                                         annotations.  Add
                                         "deprecated" annotation on
                                         old interface.
  (ClientDBus._foo): New interface annotation to mark non-compliance
                     with the standard property change signal
                     interface.
  (MandosDBusService): Inherit from DBusObjectWithProperties to get
                       interface annotation support.
  (MandosDBusService._foo): New interface annotation to mark
                            non-compliance with the standard property
                            change signal interface.

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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 "plymouth">
 
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<!ENTITY TIMESTAMP "2012-01-01">
 
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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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  <refentryinfo>
 
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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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    <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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        </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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        </address>
 
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      </author>
 
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    </authorgroup>
 
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    <copyright>
 
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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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      <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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  </refmeta>
 
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  <refnamediv>
 
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    <refname><command>&COMMANDNAME;</command></refname>
 
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    <refpurpose>Mandos plugin to use plymouth to get a
 
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    password.</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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    </cmdsynopsis>
 
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  </refsynopsisdiv>
 
59
  
 
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  <refsect1 id="description">
 
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    <title>DESCRIPTION</title>
 
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    <para>
 
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      This program prompts for a password using <citerefentry>
 
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      <refentrytitle>plymouth</refentrytitle><manvolnum>8</manvolnum>
 
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      </citerefentry> and outputs any given password to standard
 
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      output.  If no <citerefentry><refentrytitle
 
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      >plymouth</refentrytitle><manvolnum>8</manvolnum></citerefentry>
 
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      process can be found, this program will immediately exit with an
 
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      exit code indicating failure.
 
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    </para>
 
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    <para>
 
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      This program is not very useful on its own.  This program is
 
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      really meant to run as a plugin in the <application
 
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      >Mandos</application> client-side system, where it is used as a
 
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      fallback and alternative to retrieving passwords from a
 
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      <application >Mandos</application> server.
 
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    </para>
 
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    <para>
 
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      If this program is killed (presumably by
 
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      <citerefentry><refentrytitle>plugin-runner</refentrytitle>
 
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      <manvolnum>8mandos</manvolnum></citerefentry> because some other
 
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      plugin provided the password), it cannot tell <citerefentry>
 
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      <refentrytitle>plymouth</refentrytitle><manvolnum>8</manvolnum>
 
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      </citerefentry> to abort requesting a password, because
 
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      <citerefentry><refentrytitle>plymouth</refentrytitle>
 
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      <manvolnum>8</manvolnum></citerefentry> does not support this.
 
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      Therefore, this program will then <emphasis>kill</emphasis> the
 
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      running <citerefentry><refentrytitle>plymouth</refentrytitle>
 
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      <manvolnum>8</manvolnum></citerefentry> process and start a
 
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      <emphasis>new</emphasis> one using the same command line
 
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      arguments as the old one was using.
 
92
    </para>
 
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  </refsect1>
 
94
  
 
95
  <refsect1 id="options">
 
96
    <title>OPTIONS</title>
 
97
    <para>
 
98
      This program takes no options.
 
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    </para>
 
100
  </refsect1>
 
101
  
 
102
  <refsect1 id="exit_status">
 
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    <title>EXIT STATUS</title>
 
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    <para>
 
105
      If exit status is 0, the output from the program is the password
 
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      as it was read.  Otherwise, if exit status is other than 0, the
 
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      program was interrupted or encountered an error, and any output
 
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      so far could be corrupt and/or truncated, and should therefore
 
109
      be ignored.
 
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    </para>
 
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  </refsect1>
 
112
  
 
113
  <refsect1 id="environment">
 
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    <title>ENVIRONMENT</title>
 
115
    <variablelist>
 
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      <varlistentry>
 
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        <term><envar>cryptsource</envar></term>
 
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        <term><envar>crypttarget</envar></term>
 
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        <listitem>
 
120
          <para>
 
121
            If set, these environment variables will be assumed to
 
122
            contain the source device name and the target device
 
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            mapper name, respectively, and will be shown as part of
 
124
            the prompt.
 
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        </para>
 
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        <para>
 
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          These variables will normally be inherited from
 
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          <citerefentry><refentrytitle>plugin-runner</refentrytitle>
 
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          <manvolnum>8mandos</manvolnum></citerefentry>, which will
 
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          normally have inherited them from
 
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          <filename>/scripts/local-top/cryptroot</filename> in the
 
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          initial <acronym>RAM</acronym> disk environment, which will
 
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          have set them from parsing kernel arguments and
 
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          <filename>/conf/conf.d/cryptroot</filename> (also in the
 
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          initial RAM disk environment), which in turn will have been
 
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          created when the initial RAM disk image was created by
 
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          <filename
 
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          >/usr/share/initramfs-tools/hooks/cryptroot</filename>, by
 
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          extracting the information of the root file system from
 
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          <filename >/etc/crypttab</filename>.
 
141
        </para>
 
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        <para>
 
143
          This behavior is meant to exactly mirror the behavior of
 
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          <command>askpass</command>, the default password prompter.
 
145
        </para>
 
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        </listitem>
 
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      </varlistentry>
 
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    </variablelist>
 
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  </refsect1>
 
150
  
 
151
  <refsect1 id="files">
 
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    <title>FILES</title>
 
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    <variablelist>
 
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      <varlistentry>
 
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        <term><filename>/bin/plymouth</filename></term>
 
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        <listitem>
 
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          <para>
 
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            This is the command run to retrieve a password from
 
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            <citerefentry><refentrytitle>plymouth</refentrytitle>
 
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            <manvolnum>8</manvolnum></citerefentry>.
 
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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">/proc</filename></term>
 
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        <listitem>
 
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          <para>
 
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            To find the running <citerefentry><refentrytitle
 
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            >plymouth</refentrytitle><manvolnum>8</manvolnum>
 
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            </citerefentry>, this directory will be searched for
 
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            numeric entries which will be assumed to be directories.
 
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            In all those directories, the <filename>exe</filename> and
 
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            <filename>cmdline</filename> entries will be used to
 
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            determine the name of the running binary, effective user
 
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            and group <abbrev>ID</abbrev>, and the command line
 
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            arguments.  See <citerefentry><refentrytitle
 
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            >proc</refentrytitle><manvolnum>5</manvolnum>
 
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            </citerefentry>.
 
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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>/sbin/plymouthd</filename></term>
 
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        <listitem>
 
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          <para>
 
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            This is the name of the binary which will be searched for
 
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            in the process list.  See <citerefentry><refentrytitle
 
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            >plymouth</refentrytitle><manvolnum>8</manvolnum>
 
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            </citerefentry>.
 
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          </para>
 
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        </listitem>
 
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      </varlistentry>
 
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    </variablelist>
 
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  </refsect1>
 
195
  
 
196
  <refsect1 id="bugs">
 
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    <title>BUGS</title>
 
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    <para>
 
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      Killing the <citerefentry><refentrytitle
 
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      >plymouth</refentrytitle><manvolnum>8</manvolnum></citerefentry>
 
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      daemon and starting a new one is ugly, but necessary as long as
 
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      it does not support aborting a password request.
 
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    </para>
 
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  </refsect1>
 
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206
  <refsect1 id="example">
 
207
    <title>EXAMPLE</title>
 
208
    <para>
 
209
      Note that normally, this program will not be invoked directly,
 
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      but instead started by the Mandos <citerefentry><refentrytitle
 
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      >plugin-runner</refentrytitle><manvolnum>8mandos</manvolnum>
 
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      </citerefentry>.
 
213
    </para>
 
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    <informalexample>
 
215
      <para>
 
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        This program takes no options.
 
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      </para>
 
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      <para>
 
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        <userinput>&COMMANDNAME;</userinput>
 
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      </para>
 
221
    </informalexample>
 
222
  </refsect1>
 
223
  
 
224
  <refsect1 id="security">
 
225
    <title>SECURITY</title>
 
226
    <para>
 
227
      If this program is killed by a signal, it will kill the process
 
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      <abbrev>ID</abbrev> which at the start of this program was
 
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      determined to run <citerefentry><refentrytitle
 
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      >plymouth</refentrytitle><manvolnum>8</manvolnum></citerefentry>
 
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      as root (see also <xref linkend="files"/>).  There is a very
 
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      slight risk that, in the time between those events, that process
 
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      <abbrev>ID</abbrev> was freed and then taken up by another
 
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      process; the wrong process would then be killed.  Now, this
 
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      program can only be killed by the user who started it; see
 
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      <citerefentry><refentrytitle>plugin-runner</refentrytitle>
 
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      <manvolnum>8mandos</manvolnum></citerefentry>.  This program
 
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      should therefore be started by a completely separate
 
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      non-privileged user, and no other programs should be allowed to
 
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      run as that special user.  This means that it is not recommended
 
241
      to use the user "nobody" to start this program, as other
 
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      possibly less trusted programs could be running as "nobody", and
 
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      they would then be able to kill this program, triggering the
 
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      killing of the process <abbrev>ID</abbrev> which may or may not
 
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      be <citerefentry><refentrytitle>plymouth</refentrytitle>
 
246
      <manvolnum>8</manvolnum></citerefentry>.
 
247
    </para>
 
248
    <para>
 
249
      The only other thing that could be considered worthy of note is
 
250
      this:  This program is meant to be run by <citerefentry>
 
251
      <refentrytitle>plugin-runner</refentrytitle><manvolnum
 
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      >8mandos</manvolnum></citerefentry>, and will, when run
 
253
      standalone, outside, in a normal environment, immediately output
 
254
      on its standard output any presumably secret password it just
 
255
      received.  Therefore, when running this program standalone
 
256
      (which should never normally be done), take care not to type in
 
257
      any real secret password by force of habit, since it would then
 
258
      immediately be shown as output.
 
259
    </para>
 
260
  </refsect1>
 
261
  
 
262
  <refsect1 id="see_also">
 
263
    <title>SEE ALSO</title>
 
264
    <para>
 
265
      <citerefentry><refentrytitle>intro</refentrytitle>
 
266
      <manvolnum>8mandos</manvolnum></citerefentry>,
 
267
      <citerefentry><refentrytitle>crypttab</refentrytitle>
 
268
      <manvolnum>5</manvolnum></citerefentry>,
 
269
      <citerefentry><refentrytitle>plugin-runner</refentrytitle>
 
270
      <manvolnum>8mandos</manvolnum></citerefentry>,
 
271
      <citerefentry><refentrytitle>proc</refentrytitle>
 
272
      <manvolnum>5</manvolnum></citerefentry>,
 
273
      <citerefentry><refentrytitle>plymouth</refentrytitle>
 
274
      <manvolnum>8</manvolnum></citerefentry>
 
275
    </para>
 
276
  </refsect1>
 
277
</refentry>
 
278
<!-- Local Variables: -->
 
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<!-- time-stamp-start: "<!ENTITY TIMESTAMP [\"']" -->
 
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<!-- time-stamp-end: "[\"']>" -->
 
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<!-- time-stamp-format: "%:y-%02m-%02d" -->
 
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<!-- End: -->