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  • Committer: Teddy Hogeborn
  • Date: 2018-04-02 10:24:15 UTC
  • Revision ID: teddy@recompile.se-20180402102415-xrsu0wxhnmlaq29a
Minor code cleanup

* plugins.d/mandos-client.c (pgp_packet_decrypt): Use a "for"
  statement instead of a "while" statement to move initialization and
  stepping into the for statement, and reduce loop variable name
  length.

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mandos.xml
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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 "mandos">
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<!ENTITY TIMESTAMP "2010-09-25">
 
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<!ENTITY TIMESTAMP "2018-02-08">
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<!ENTITY % common SYSTEM "common.ent">
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%common;
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]>
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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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      <holder>Teddy Hogeborn</holder>
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      <holder>Björn Påhlsson</holder>
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    </copyright>
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      <sbr/>
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      <arg><option>--debug</option></arg>
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      <sbr/>
 
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      <arg><option>--debuglevel
 
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      <replaceable>LEVEL</replaceable></option></arg>
 
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      <sbr/>
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      <arg><option>--no-dbus</option></arg>
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      <sbr/>
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      <arg><option>--no-ipv6</option></arg>
 
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      <sbr/>
 
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      <arg><option>--no-restore</option></arg>
 
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      <sbr/>
 
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      <arg><option>--statedir
 
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      <replaceable>DIRECTORY</replaceable></option></arg>
 
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      <sbr/>
 
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      <arg><option>--socket
 
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      <replaceable>FD</replaceable></option></arg>
 
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      <sbr/>
 
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      <arg><option>--foreground</option></arg>
 
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      <sbr/>
 
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      <arg><option>--no-zeroconf</option></arg>
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    </cmdsynopsis>
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    <cmdsynopsis>
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      <command>&COMMANDNAME;</command>
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    <para>
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      <command>&COMMANDNAME;</command> is a server daemon which
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      handles incoming request for passwords for a pre-defined list of
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      client host computers.  The Mandos server uses Zeroconf to
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      announce itself on the local network, and uses TLS to
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      communicate securely with and to authenticate the clients.  The
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      Mandos server uses IPv6 to allow Mandos clients to use IPv6
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      link-local addresses, since the clients will probably not have
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      any other addresses configured (see <xref linkend="overview"/>).
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      Any authenticated client is then given the stored pre-encrypted
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      password for that specific client.
 
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      client host computers. For an introduction, see
 
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      <citerefentry><refentrytitle>intro</refentrytitle>
 
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      <manvolnum>8mandos</manvolnum></citerefentry>. The Mandos server
 
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      uses Zeroconf to announce itself on the local network, and uses
 
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      TLS to communicate securely with and to authenticate the
 
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      clients.  The Mandos server uses IPv6 to allow Mandos clients to
 
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      use IPv6 link-local addresses, since the clients will probably
 
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      not have any other addresses configured (see <xref
 
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      linkend="overview"/>).  Any authenticated client is then given
 
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      the stored pre-encrypted password for that specific client.
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    </para>
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  </refsect1>
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      </varlistentry>
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      <varlistentry>
 
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        <term><option>--debuglevel
 
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        <replaceable>LEVEL</replaceable></option></term>
 
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        <listitem>
 
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          <para>
 
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            Set the debugging log level.
 
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            <replaceable>LEVEL</replaceable> is a string, one of
 
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            <quote><literal>CRITICAL</literal></quote>,
 
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            <quote><literal>ERROR</literal></quote>,
 
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            <quote><literal>WARNING</literal></quote>,
 
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            <quote><literal>INFO</literal></quote>, or
 
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            <quote><literal>DEBUG</literal></quote>, in order of
 
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            increasing verbosity.  The default level is
 
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            <quote><literal>WARNING</literal></quote>.
 
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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>--priority <replaceable>
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        PRIORITY</replaceable></option></term>
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        <listitem>
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          <xi:include href="mandos-options.xml" xpointer="ipv6"/>
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        </listitem>
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      </varlistentry>
 
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      <varlistentry>
 
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        <term><option>--no-restore</option></term>
 
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        <listitem>
 
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          <xi:include href="mandos-options.xml" xpointer="restore"/>
 
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          <para>
 
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            See also <xref linkend="persistent_state"/>.
 
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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>--statedir
 
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        <replaceable>DIRECTORY</replaceable></option></term>
 
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        <listitem>
 
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          <xi:include href="mandos-options.xml" xpointer="statedir"/>
 
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        </listitem>
 
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      </varlistentry>
 
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      <varlistentry>
 
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        <term><option>--socket
 
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        <replaceable>FD</replaceable></option></term>
 
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        <listitem>
 
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          <xi:include href="mandos-options.xml" xpointer="socket"/>
 
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        </listitem>
 
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      </varlistentry>
 
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      <varlistentry>
 
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        <term><option>--foreground</option></term>
 
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        <listitem>
 
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          <xi:include href="mandos-options.xml"
 
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                      xpointer="foreground"/>
 
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        </listitem>
 
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      </varlistentry>
 
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      <varlistentry>
 
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        <term><option>--no-zeroconf</option></term>
 
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        <listitem>
 
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          <xi:include href="mandos-options.xml" xpointer="zeroconf"/>
 
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        </listitem>
 
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      </varlistentry>
 
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    </variablelist>
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  </refsect1>
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      for some time, the client is assumed to be compromised and is no
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      longer eligible to receive the encrypted password.  (Manual
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      intervention is required to re-enable a client.)  The timeout,
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      checker program, and interval between checks can be configured
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      both globally and per client; see <citerefentry>
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      <refentrytitle>mandos-clients.conf</refentrytitle>
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      <manvolnum>5</manvolnum></citerefentry>.  A client successfully
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      receiving its password will also be treated as a successful
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      checker run.
 
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      extended timeout, checker program, and interval between checks
 
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      can be configured both globally and per client; see
 
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      <citerefentry><refentrytitle>mandos-clients.conf</refentrytitle>
 
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      <manvolnum>5</manvolnum></citerefentry>.
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    </para>
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  </refsect1>
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    <title>LOGGING</title>
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    <para>
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      The server will send log message with various severity levels to
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      <filename>/dev/log</filename>.  With the
 
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      <filename class="devicefile">/dev/log</filename>.  With the
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      <option>--debug</option> option, it will log even more messages,
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      and also show them on the console.
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    </para>
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  </refsect1>
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455
  <refsect1 id="persistent_state">
 
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    <title>PERSISTENT STATE</title>
 
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    <para>
 
458
      Client settings, initially read from
 
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      <filename>clients.conf</filename>, are persistent across
 
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      restarts, and run-time changes will override settings in
 
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      <filename>clients.conf</filename>.  However, if a setting is
 
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      <emphasis>changed</emphasis> (or a client added, or removed) in
 
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      <filename>clients.conf</filename>, this will take precedence.
 
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    </para>
 
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  </refsect1>
 
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  <refsect1 id="dbus_interface">
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    <title>D-BUS INTERFACE</title>
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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>/var/run/mandos.pid</filename></term>
 
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        <term><filename>/run/mandos.pid</filename></term>
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        <listitem>
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          <para>
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            The file containing the process id of the
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            <command>&COMMANDNAME;</command> process started last.
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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>/dev/log</filename></term>
 
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            <emphasis >Note:</emphasis> If the <filename
 
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            class="directory">/run</filename> directory does not
 
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            exist, <filename>/var/run/mandos.pid</filename> will be
 
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            used instead.
 
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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
 
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        class="directory">/var/lib/mandos</filename></term>
 
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        <listitem>
 
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          <para>
 
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            Directory where persistent state will be saved.  Change
 
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            this with the <option>--statedir</option> option.  See
 
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            also the <option>--no-restore</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="devicefile">/dev/log</filename></term>
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        <listitem>
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          <para>
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            The Unix domain socket to where local syslog messages are
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      backtrace.  This could be considered a feature.
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    </para>
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    <para>
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      Currently, if a client is disabled due to having timed out, the
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      server does not record this fact onto permanent storage.  This
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      has some security implications, see <xref linkend="clients"/>.
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    </para>
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    <para>
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      There is no fine-grained control over logging and debug output.
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    </para>
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    <para>
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      Debug mode is conflated with running in the foreground.
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    </para>
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    <para>
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      The console log messages do not show a time stamp.
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    </para>
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    <para>
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      This server does not check the expire time of clients’ OpenPGP
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      keys.
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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="example">
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    <informalexample>
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      <para>
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        Run the server in debug mode, read configuration files from
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        the <filename>~/mandos</filename> directory, and use the
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        Zeroconf service name <quote>Test</quote> to not collide with
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        any other official Mandos server on this host:
 
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        the <filename class="directory">~/mandos</filename> directory,
 
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        and use the Zeroconf service name <quote>Test</quote> to not
 
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        collide with any other official Mandos server on this host:
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      </para>
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      <para>
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        compromised if they are gone for too long.
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      </para>
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      <para>
565
 
        If a client is compromised, its downtime should be duly noted
566
 
        by the server which would therefore disable the client.  But
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        if the server was ever restarted, it would re-read its client
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        list from its configuration file and again regard all clients
569
 
        therein as enabled, and hence eligible to receive their
570
 
        passwords.  Therefore, be careful when restarting servers if
571
 
        it is suspected that a client has, in fact, been compromised
572
 
        by parties who may now be running a fake Mandos client with
573
 
        the keys from the non-encrypted initial <acronym>RAM</acronym>
574
 
        image of the client host.  What should be done in that case
575
 
        (if restarting the server program really is necessary) is to
576
 
        stop the server program, edit the configuration file to omit
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        any suspect clients, and restart the server program.
578
 
      </para>
579
 
      <para>
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        For more details on client-side security, see
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        <citerefentry><refentrytitle>mandos-client</refentrytitle>
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        <manvolnum>8mandos</manvolnum></citerefentry>.
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  <refsect1 id="see_also">
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    <title>SEE ALSO</title>
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    <para>
590
 
      <citerefentry>
591
 
        <refentrytitle>mandos-clients.conf</refentrytitle>
592
 
        <manvolnum>5</manvolnum></citerefentry>, <citerefentry>
593
 
        <refentrytitle>mandos.conf</refentrytitle>
594
 
        <manvolnum>5</manvolnum></citerefentry>, <citerefentry>
595
 
        <refentrytitle>mandos-client</refentrytitle>
596
 
        <manvolnum>8mandos</manvolnum></citerefentry>, <citerefentry>
597
 
        <refentrytitle>sh</refentrytitle><manvolnum>1</manvolnum>
598
 
      </citerefentry>
 
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      <citerefentry><refentrytitle>intro</refentrytitle>
 
677
      <manvolnum>8mandos</manvolnum></citerefentry>,
 
678
      <citerefentry><refentrytitle>mandos-clients.conf</refentrytitle>
 
679
      <manvolnum>5</manvolnum></citerefentry>,
 
680
      <citerefentry><refentrytitle>mandos.conf</refentrytitle>
 
681
      <manvolnum>5</manvolnum></citerefentry>,
 
682
      <citerefentry><refentrytitle>mandos-client</refentrytitle>
 
683
      <manvolnum>8mandos</manvolnum></citerefentry>,
 
684
      <citerefentry><refentrytitle>sh</refentrytitle>
 
685
      <manvolnum>1</manvolnum></citerefentry>
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    </para>
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    <variablelist>
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      <varlistentry>
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      </varlistentry>
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      <varlistentry>
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        <term>
625
 
          <ulink url="http://www.gnu.org/software/gnutls/"
626
 
          >GnuTLS</ulink>
 
712
          <ulink url="https://gnutls.org/">GnuTLS</ulink>
627
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        </term>
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      <listitem>
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        <para>
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      </varlistentry>
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      <varlistentry>
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        <term>
670
 
          RFC 4346: <citetitle>The Transport Layer Security (TLS)
671
 
          Protocol Version 1.1</citetitle>
 
756
          RFC 5246: <citetitle>The Transport Layer Security (TLS)
 
757
          Protocol Version 1.2</citetitle>
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        </term>
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      <listitem>
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        <para>
675
 
          TLS 1.1 is the protocol implemented by GnuTLS.
 
761
          TLS 1.2 is the protocol implemented by GnuTLS.
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        </para>
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      </listitem>
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      </varlistentry>
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      </varlistentry>
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      <varlistentry>
690
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        <term>
691
 
          RFC 5081: <citetitle>Using OpenPGP Keys for Transport Layer
692
 
          Security</citetitle>
 
777
          RFC 6091: <citetitle>Using OpenPGP Keys for Transport Layer
 
778
          Security (TLS) Authentication</citetitle>
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        </term>
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      <listitem>
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        <para>