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  • Committer: Teddy Hogeborn
  • Date: 2015-03-10 18:03:38 UTC
  • Revision ID: teddy@recompile.se-20150310180338-pcxw6r2qmw9k6br9
Add ":!RSA" to GnuTLS priority string, to disallow non-DHE kx.

If Mandos was somehow made to use a non-ephemeral Diffie-Hellman key
exchange algorithm in the TLS handshake, any saved network traffic
could then be decrypted later if the Mandos client key was obtained.
By default, Mandos uses ephemeral DH key exchanges which does not have
this problem, but a non-ephemeral key exchange algorithm was still
enabled by default.  The simplest solution is to simply turn that off,
which ensures that Mandos will always use ephemeral DH key exchanges.

There is a "PFS" priority string specifier, but we can't use it because:

1. Security-wise, it is a mix between "NORMAL" and "SECURE128" - it
   enables a lot more algorithms than "SECURE256".

2. It is only available since GnuTLS 3.2.4.

Thanks to Andreas Fischer <af@bantuX.org> for reporting this issue.

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mandos.conf.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 CONFNAME "mandos.conf">
 
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<!ENTITY CONFPATH "<filename>/etc/mandos/mandos.conf</filename>">
 
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<!ENTITY TIMESTAMP "2013-10-23">
 
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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>2008</year>
 
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      <year>2009</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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      <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>&CONFNAME;</refentrytitle>
 
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    <manvolnum>5</manvolnum>
 
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  </refmeta>
 
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  <refnamediv>
 
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    <refname><filename>&CONFNAME;</filename></refname>
 
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    <refpurpose>
 
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      Configuration file for the Mandos server
 
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    </refpurpose>
 
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  </refnamediv>
 
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  <refsynopsisdiv>
 
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    <synopsis>&CONFPATH;</synopsis>
 
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  </refsynopsisdiv>
 
61
  
 
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  <refsect1 id="description">
 
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    <title>DESCRIPTION</title>
 
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    <para>
 
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      The file &CONFPATH; is a simple configuration file for
 
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      <citerefentry><refentrytitle>mandos</refentrytitle>
 
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      <manvolnum>8</manvolnum></citerefentry>, and is read by it at
 
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      startup.  The configuration file starts with <quote><literal
 
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      >[DEFAULT]</literal></quote> on a line by itself, followed by
 
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      any number of <quote><varname><replaceable>option</replaceable
 
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      ></varname>=<replaceable>value</replaceable></quote> entries,
 
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      with continuations in the style of RFC 822.  <quote><varname
 
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      ><replaceable>option</replaceable></varname>: <replaceable
 
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      >value</replaceable></quote> is also accepted.  Note that
 
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      leading whitespace is removed from values.  Lines beginning with
 
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      <quote>#</quote> or <quote>;</quote> are ignored and may be used
 
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      to provide comments.
 
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    </para>
 
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  </refsect1>
 
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  <refsect1>
 
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    <title>OPTIONS</title>
 
83
    
 
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    <variablelist>
 
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      <varlistentry>
 
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        <term><option>interface<literal> = </literal><replaceable
 
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        >NAME</replaceable></option></term>
 
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        <listitem>
 
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          <xi:include href="mandos-options.xml" xpointer="interface"/>
 
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        </listitem>
 
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      </varlistentry>
 
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      <varlistentry>
 
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        <term><option>address<literal> = </literal><replaceable
 
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          >ADDRESS</replaceable></option></term>
 
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        <listitem>
 
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          <xi:include href="mandos-options.xml" xpointer="address"/>
 
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        </listitem>
 
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      </varlistentry>
 
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      <varlistentry>
 
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        <term><option>port<literal> = </literal><replaceable
 
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        >NUMBER</replaceable></option></term>
 
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        <listitem>
 
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          <xi:include href="mandos-options.xml" xpointer="port"/>
 
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        </listitem>
 
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      </varlistentry>
 
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      <varlistentry>
 
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        <term><option>debug<literal> = </literal>{ <literal
 
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          >1</literal> | <literal>yes</literal> | <literal
 
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          >true</literal> | <literal>on</literal> | <literal
 
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          >0</literal> | <literal>no</literal> | <literal
 
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          >false</literal> | <literal>off</literal> }</option></term>
 
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        <listitem>
 
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          <xi:include href="mandos-options.xml" xpointer="debug"/>
 
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        </listitem>
 
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      </varlistentry>
 
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      <varlistentry>
 
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        <term><option>priority<literal> = </literal><replaceable
 
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        >STRING</replaceable></option></term>
 
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        <listitem>
 
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          <xi:include href="mandos-options.xml"
 
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                      xpointer="priority_compat"/>
 
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        </listitem>
 
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      </varlistentry>
 
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      <varlistentry>
 
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        <term><option>servicename<literal> = </literal
 
131
        ><replaceable>NAME</replaceable></option></term>
 
132
        <listitem>
 
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          <xi:include href="mandos-options.xml"
 
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                      xpointer="servicename"/>
 
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        </listitem>
 
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      </varlistentry>
 
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      <varlistentry>
 
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        <term><option>use_dbus<literal> = </literal>{ <literal
 
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          >1</literal> | <literal>yes</literal> | <literal
 
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          >true</literal> | <literal>on</literal> | <literal
 
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          >0</literal> | <literal>no</literal> | <literal
 
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          >false</literal> | <literal>off</literal> }</option></term>
 
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        <listitem>
 
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          <xi:include href="mandos-options.xml" xpointer="dbus"/>
 
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        </listitem>
 
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      </varlistentry>
 
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      <varlistentry>
 
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        <term><option>use_ipv6<literal> = </literal>{ <literal
 
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          >1</literal> | <literal>yes</literal> | <literal
 
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          >true</literal> | <literal>on</literal> | <literal
 
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          >0</literal> | <literal>no</literal> | <literal
 
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          >false</literal> | <literal>off</literal> }</option></term>
 
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        <listitem>
 
156
          <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>restore<literal> = </literal>{ <literal
 
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          >1</literal> | <literal>yes</literal> | <literal
 
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          >true</literal> | <literal>on</literal> | <literal
 
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          >0</literal> | <literal>no</literal> | <literal
 
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          >false</literal> | <literal>off</literal> }</option></term>
 
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        <listitem>
 
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          <xi:include href="mandos-options.xml" xpointer="restore"/>
 
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        </listitem>
 
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      </varlistentry>
 
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      <varlistentry>
 
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        <term><option>statedir<literal> = </literal><replaceable
 
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        >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<literal> = </literal><replaceable
 
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        >NUMBER</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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    </variablelist>
 
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  </refsect1>
 
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190
  <refsect1 id="files">
 
191
    <title>FILES</title>
 
192
    <para>
 
193
      The file described here is &CONFPATH;
 
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    </para>
 
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  </refsect1>
 
196
  
 
197
  <refsect1 id="bugs">
 
198
    <title>BUGS</title>
 
199
    <para>
 
200
      The <literal>[DEFAULT]</literal> is necessary because the Python
 
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      built-in module <systemitem class="library">ConfigParser</systemitem>
 
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      requires it.
 
203
    </para>
 
204
  </refsect1>
 
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206
  <refsect1 id="example">
 
207
    <title>EXAMPLE</title>
 
208
    <informalexample>
 
209
      <para>
 
210
        No options are actually required:
 
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      </para>
 
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      <programlisting>
 
213
[DEFAULT]
 
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      </programlisting>
 
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    </informalexample>
 
216
    <informalexample>
 
217
      <para>
 
218
        An example using all the options:
 
219
      </para>
 
220
      <programlisting>
 
221
[DEFAULT]
 
222
# A configuration example
 
223
interface = eth0
 
224
address = fe80::aede:48ff:fe71:f6f2
 
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port = 1025
 
226
debug = true
 
227
priority = SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP
 
228
servicename = Daena
 
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use_dbus = False
 
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use_ipv6 = True
 
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restore = True
 
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statedir = /var/lib/mandos
 
233
      </programlisting>
 
234
    </informalexample>
 
235
  </refsect1>
 
236
  
 
237
  <refsect1 id="see_also">
 
238
    <title>SEE ALSO</title>
 
239
    <para>
 
240
      <citerefentry><refentrytitle>intro</refentrytitle>
 
241
      <manvolnum>8mandos</manvolnum></citerefentry>,
 
242
      <citerefentry><refentrytitle>gnutls_priority_init</refentrytitle
 
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      ><manvolnum>3</manvolnum></citerefentry>,
 
244
      <citerefentry><refentrytitle>mandos</refentrytitle>
 
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      <manvolnum>8</manvolnum></citerefentry>,
 
246
      <citerefentry><refentrytitle>mandos-clients.conf</refentrytitle>
 
247
      <manvolnum>5</manvolnum></citerefentry>
 
248
    </para>
 
249
    
 
250
    <variablelist>
 
251
      <varlistentry>
 
252
        <term>
 
253
          RFC 4291: <citetitle>IP Version 6 Addressing
 
254
          Architecture</citetitle>
 
255
        </term>
 
256
        <listitem>
 
257
          <variablelist>
 
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            <varlistentry>
 
259
              <term>Section 2.2: <citetitle>Text Representation of
 
260
              Addresses</citetitle></term>
 
261
              <listitem><para/></listitem>
 
262
            </varlistentry>
 
263
            <varlistentry>
 
264
              <term>Section 2.5.5.2: <citetitle>IPv4-Mapped IPv6
 
265
              Address</citetitle></term>
 
266
              <listitem><para/></listitem>
 
267
            </varlistentry>
 
268
            <varlistentry>
 
269
            <term>Section 2.5.6, <citetitle>Link-Local IPv6 Unicast
 
270
            Addresses</citetitle></term>
 
271
            <listitem>
 
272
              <para>
 
273
                The clients use IPv6 link-local addresses, which are
 
274
                immediately usable since a link-local addresses is
 
275
                automatically assigned to a network interface when it
 
276
                is brought up.
 
277
              </para>
 
278
            </listitem>
 
279
            </varlistentry>
 
280
          </variablelist>
 
281
        </listitem>
 
282
      </varlistentry>
 
283
      <varlistentry>
 
284
        <term>
 
285
          <ulink url="http://www.zeroconf.org/">Zeroconf</ulink>
 
286
        </term>
 
287
        <listitem>
 
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          <para>
 
289
            Zeroconf is the network protocol standard used by clients
 
290
            for finding the Mandos server on the local network.
 
291
          </para>
 
292
        </listitem>
 
293
      </varlistentry>
 
294
    </variablelist>
 
295
  </refsect1>
 
296
</refentry>
 
297
<!-- 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: -->