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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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<?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 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>&CONFNAME;</title>
 
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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>&CONFNAME;</productname>
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    <productnumber>&VERSION;</productnumber>
 
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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@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>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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    <legalnotice>
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      <para>
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        This manual page is free software: you can redistribute it
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        and/or modify it under the terms of the GNU General Public
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        License as published by the Free Software Foundation,
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        either version 3 of the License, or (at your option) any
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        later version.
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      </para>
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      <para>
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        This manual page is distributed in the hope that it will
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        be useful, but WITHOUT ANY WARRANTY; without even the
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        implied warranty of MERCHANTABILITY or FITNESS FOR A
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        PARTICULAR PURPOSE.  See the GNU General Public License
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        for more details.
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      </para>
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      <para>
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        You should have received a copy of the GNU General Public
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        License along with this program; If not, see
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        <ulink url="http://www.gnu.org/licenses/"/>.
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      </para>
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    </legalnotice>
 
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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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      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>
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      &CONFPATH;
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    </synopsis>
 
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    <synopsis>&CONFPATH;</synopsis>
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  </refsynopsisdiv>
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  <refsect1 id="description">
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    <title>DESCRIPTION</title>
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    <para>
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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>
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    <variablelist>
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      <varlistentry>
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        <term><varname>interface</varname></term>
 
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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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          <synopsis><literal>interface = </literal><replaceable
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          >IF</replaceable>
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          </synopsis>
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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><varname>address</varname></term>
 
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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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          <synopsis><literal>address = </literal><replaceable
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          >ADDRESS</replaceable>
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          </synopsis>
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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><varname>port</varname></term>
 
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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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          <synopsis><literal>port = </literal><replaceable
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          >PORT</replaceable>
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          </synopsis>
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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><varname>debug</varname></term>
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        <listitem>
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          <synopsis><literal>debug = </literal>{ <literal
 
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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> }
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          </synopsis>
 
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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><varname>priority</varname></term>
 
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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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          <synopsis><literal>priority = </literal><replaceable
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          >PRIORITY</replaceable>
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          </synopsis>
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          <xi:include href="mandos-options.xml" xpointer="priority"/>
 
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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><varname>servicename</varname></term>
 
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        <term><option>servicename<literal> = </literal
 
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        ><replaceable>NAME</replaceable></option></term>
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        <listitem>
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          <synopsis><literal>servicename = </literal><replaceable
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          >NAME</replaceable>
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          </synopsis>
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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>
 
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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>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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    <para>
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      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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      requres it.
 
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      requires it.
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    </para>
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  </refsect1>
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[DEFAULT]
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# A configuration example
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interface = eth0
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address = 2001:db8:f983:bd0b:30de:ae4a:71f2:f672
 
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address = fe80::aede:48ff:fe71:f6f2
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port = 1025
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debug = true
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priority = SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP
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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
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      </programlisting>
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    </informalexample>
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  </refsect1>
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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>
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        <refentrytitle>mandos</refentrytitle>
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        <manvolnum>8</manvolnum></citerefentry>, <citerefentry>
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        <refentrytitle>mandos-clients.conf</refentrytitle>
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        <manvolnum>5</manvolnum></citerefentry>
 
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      <citerefentry><refentrytitle>intro</refentrytitle>
 
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      <manvolnum>8mandos</manvolnum></citerefentry>,
 
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      <citerefentry><refentrytitle>gnutls_priority_init</refentrytitle
 
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      ><manvolnum>3</manvolnum></citerefentry>,
 
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      <citerefentry><refentrytitle>mandos</refentrytitle>
 
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      <manvolnum>8</manvolnum></citerefentry>,
 
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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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    <variablelist>
 
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      <varlistentry>
 
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        <term>
 
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          RFC 4291: <citetitle>IP Version 6 Addressing
 
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          Architecture</citetitle>
 
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        </term>
 
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        <listitem>
 
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          <variablelist>
 
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            <varlistentry>
 
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              <term>Section 2.2: <citetitle>Text Representation of
 
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              Addresses</citetitle></term>
 
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              <listitem><para/></listitem>
 
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            </varlistentry>
 
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            <varlistentry>
 
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              <term>Section 2.5.5.2: <citetitle>IPv4-Mapped IPv6
 
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              Address</citetitle></term>
 
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              <listitem><para/></listitem>
 
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            </varlistentry>
 
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            <varlistentry>
 
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            <term>Section 2.5.6, <citetitle>Link-Local IPv6 Unicast
 
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            Addresses</citetitle></term>
 
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            <listitem>
 
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              <para>
 
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                The clients use IPv6 link-local addresses, which are
 
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                immediately usable since a link-local addresses is
 
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                automatically assigned to a network interface when it
 
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                is brought up.
 
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              </para>
 
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            </listitem>
 
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            </varlistentry>
 
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          </variablelist>
 
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        </listitem>
 
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      </varlistentry>
 
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      <varlistentry>
 
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        <term>
 
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          <ulink url="http://www.zeroconf.org/">Zeroconf</ulink>
 
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        </term>
 
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        <listitem>
 
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          <para>
 
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            Zeroconf is the network protocol standard used by clients
 
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            for finding the Mandos server on the local network.
 
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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>
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</refentry>
 
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<!-- 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: -->