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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-ctl.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-ctl">
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<!ENTITY TIMESTAMP "2019-03-09">
 
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<!ENTITY TIMESTAMP "2012-06-22">
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<!ENTITY % common SYSTEM "common.ent">
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%common;
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]>
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      <year>2010</year>
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      <year>2011</year>
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      <year>2012</year>
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      <year>2013</year>
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      <year>2014</year>
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      <year>2015</year>
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      <year>2016</year>
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      <year>2017</year>
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      <year>2018</year>
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      <year>2019</year>
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      <holder>Teddy Hogeborn</holder>
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      <holder>Björn Påhlsson</holder>
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    </copyright>
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  <refnamediv>
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    <refname><command>&COMMANDNAME;</command></refname>
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    <refpurpose>
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      Control or query the operation of the Mandos server
 
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      Control the operation of the Mandos server
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    </refpurpose>
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  </refnamediv>
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    <cmdsynopsis>
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      <command>&COMMANDNAME;</command>
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      <group>
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          <arg choice="plain"><option>--verbose</option></arg>
67
 
          <arg choice="plain"><option>-v</option></arg>
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          <sbr/>
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          <arg choice="plain"><option>--dump-json</option></arg>
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          <arg choice="plain"><option>-j</option></arg>
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      </group>
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      <arg><option>--debug</option></arg>
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      <group>
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        <arg rep='repeat' choice='plain'>
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          <replaceable>CLIENT</replaceable>
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        </arg>
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      </group>
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    </cmdsynopsis>
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    <cmdsynopsis>
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      <command>&COMMANDNAME;</command>
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      <group choice="req">
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        <group>
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          <arg choice="plain"><option>--enable</option></arg>
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          <arg choice="plain"><option>-e</option></arg>
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          <sbr/>
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          <arg choice="plain"><option>--disable</option></arg>
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          <arg choice="plain"><option>-d</option></arg>
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        </group>
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        <sbr/>
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        <group>
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          <arg choice="plain"><option>--bump-timeout</option></arg>
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          <arg choice="plain"><option>-b</option></arg>
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        </group>
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        <sbr/>
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        <group>
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          <arg choice="plain"><option>--start-checker</option></arg>
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          <arg choice="plain"><option>--stop-checker</option></arg>
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        </group>
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        <sbr/>
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        <group>
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          <arg choice="plain"><option>--checker
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          <replaceable>COMMAND</replaceable></option></arg>
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          <arg choice="plain"><option>-c
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          <replaceable>COMMAND</replaceable></option></arg>
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        </group>
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        <sbr/>
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        <group>
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          <arg choice="plain"><option>--timeout
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          <replaceable>TIME</replaceable></option></arg>
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          <arg choice="plain"><option>-t
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          <replaceable>TIME</replaceable></option></arg>
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        </group>
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        <sbr/>
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        <group>
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          <arg choice="plain"><option>--extended-timeout
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          <replaceable>TIME</replaceable></option></arg>
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        </group>
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        <sbr/>
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        <group>
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          <arg choice="plain"><option>--interval
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          <replaceable>TIME</replaceable></option></arg>
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          <arg choice="plain"><option>-i
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          <replaceable>TIME</replaceable></option></arg>
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        </group>
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        <sbr/>
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        <group>
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          <arg choice="plain"><option>--approve-by-default</option
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          ></arg>
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          <sbr/>
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          <arg choice="plain"><option>--deny-by-default</option></arg>
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        </group>
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        <sbr/>
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        <group>
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          <arg choice="plain"><option>--approval-delay
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          <replaceable>TIME</replaceable></option></arg>
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        </group>
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        <sbr/>
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        <group>
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          <arg choice="plain"><option>--approval-duration
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          <replaceable>TIME</replaceable></option></arg>
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        </group>
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        <sbr/>
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        <group>
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          <arg choice="plain"><option>--host
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          <replaceable>STRING</replaceable></option></arg>
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          <arg choice="plain"><option>-H
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          <replaceable>STRING</replaceable></option></arg>
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        </group>
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        <sbr/>
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        <group>
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          <arg choice="plain"><option>--secret
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          <replaceable>FILENAME</replaceable></option></arg>
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          <arg choice="plain"><option>-s
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          <replaceable>FILENAME</replaceable></option></arg>
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        </group>
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        <sbr/>
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        <group>
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          <arg choice="plain"><option>--approve</option></arg>
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          <arg choice="plain"><option>-A</option></arg>
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          <sbr/>
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          <arg choice="plain"><option>--deny</option></arg>
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          <arg choice="plain"><option>-D</option></arg>
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        </group>
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      </group>
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      <sbr/>
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      <arg><option>--debug</option></arg>
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      <group choice="req">
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        <arg choice="plain"><option>--all</option></arg>
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        <arg choice="plain"><option>-a</option></arg>
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        <arg rep='repeat' choice='plain'>
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          <replaceable>CLIENT</replaceable>
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        </arg>
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      </group>
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    </cmdsynopsis>
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    <cmdsynopsis>
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      <command>&COMMANDNAME;</command>
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      <group>
 
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        <arg choice="plain"><option>--enable</option></arg>
 
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        <arg choice="plain"><option>-e</option></arg>
 
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        <sbr/>
 
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        <arg choice="plain"><option>--disable</option></arg>
 
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        <arg choice="plain"><option>-d</option></arg>
 
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      </group>
 
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      <sbr/>
 
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      <group>
 
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        <arg choice="plain"><option>--bump-timeout</option></arg>
 
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        <arg choice="plain"><option>-b</option></arg>
 
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      </group>
 
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      <sbr/>
 
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      <group>
 
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        <arg choice="plain"><option>--start-checker</option></arg>
 
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      </group>
 
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      <sbr/>
 
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      <group>
 
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        <arg choice="plain"><option>--stop-checker</option></arg>
 
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      </group>
 
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      <sbr/>
 
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      <group>
 
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        <arg choice="plain"><option>--remove</option></arg>
 
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        <arg choice="plain"><option>-r</option></arg>
 
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      </group>
 
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      <sbr/>
 
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      <group>
 
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        <arg choice="plain"><option>--checker
 
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        <replaceable>COMMAND</replaceable></option></arg>
 
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        <arg choice="plain"><option>-c
 
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        <replaceable>COMMAND</replaceable></option></arg>
 
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      </group>
 
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      <sbr/>
 
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      <group>
 
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        <arg choice="plain"><option>--timeout
 
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        <replaceable>TIME</replaceable></option></arg>
 
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        <arg choice="plain"><option>-t
 
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        <replaceable>TIME</replaceable></option></arg>
 
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      </group>
 
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      <sbr/>
 
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      <group>
 
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        <arg choice="plain"><option>--extended-timeout
 
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        <replaceable>TIME</replaceable></option></arg>
 
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      </group>
 
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      <sbr/>
 
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      <group>
 
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        <arg choice="plain"><option>--interval
 
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        <replaceable>TIME</replaceable></option></arg>
 
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        <arg choice="plain"><option>-i
 
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        <replaceable>TIME</replaceable></option></arg>
 
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      </group>
 
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      <sbr/>
 
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      <group>
 
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        <arg choice="plain"><option>--approve-by-default</option
 
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        ></arg>
 
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        <sbr/>
 
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        <arg choice="plain"><option>--deny-by-default</option></arg>
 
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      </group>
 
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      <sbr/>
 
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      <group>
 
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        <arg choice="plain"><option>--approval-delay
 
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        <replaceable>TIME</replaceable></option></arg>
 
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      </group>
 
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      <sbr/>
 
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      <group>
 
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        <arg choice="plain"><option>--approval-duration
 
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        <replaceable>TIME</replaceable></option></arg>
 
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      </group>
 
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      <sbr/>
 
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      <group>
 
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        <arg choice="plain"><option>--interval
 
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        <replaceable>TIME</replaceable></option></arg>
 
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        <arg choice="plain"><option>-i
 
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        <replaceable>TIME</replaceable></option></arg>
 
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      </group>
 
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      <sbr/>
 
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      <group>
 
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        <arg choice="plain"><option>--host
 
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        <replaceable>STRING</replaceable></option></arg>
 
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        <arg choice="plain"><option>-H
 
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        <replaceable>STRING</replaceable></option></arg>
 
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      </group>
 
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      <sbr/>
 
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      <group>
 
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        <arg choice="plain"><option>--secret
 
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        <replaceable>FILENAME</replaceable></option></arg>
 
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        <arg choice="plain"><option>-s
 
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        <replaceable>FILENAME</replaceable></option></arg>
 
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      </group>
 
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      <sbr/>
 
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      <group>
 
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        <arg choice="plain"><option>--approve</option></arg>
 
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        <arg choice="plain"><option>-A</option></arg>
 
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        <sbr/>
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        <arg choice="plain"><option>--deny</option></arg>
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        <arg choice="plain"><option>-D</option></arg>
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      </group>
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      <group choice="req">
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          <arg choice="plain"><option>--remove</option></arg>
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          <arg choice="plain"><option>-r</option></arg>
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      </group>
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      <sbr/>
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      <arg><option>--debug</option></arg>
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      <group choice="req">
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        <arg choice="plain"><option>--all</option></arg>
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        <arg choice="plain"><option>-a</option></arg>
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    </cmdsynopsis>
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    <cmdsynopsis>
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      <command>&COMMANDNAME;</command>
 
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      <group>
 
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        <arg choice="plain"><option>--verbose</option></arg>
 
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        <arg choice="plain"><option>-v</option></arg>
 
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      </group>
 
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      <group>
 
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        <arg rep='repeat' choice='plain'>
 
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          <replaceable>CLIENT</replaceable>
 
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        </arg>
 
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      </group>
 
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    </cmdsynopsis>
 
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    <cmdsynopsis>
 
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      <command>&COMMANDNAME;</command>
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      <group choice="req">
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        <arg choice="plain"><option>--is-enabled</option></arg>
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        <arg choice="plain"><option>-V</option></arg>
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      </group>
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      <arg><option>--debug</option></arg>
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      <arg choice='plain'><replaceable>CLIENT</replaceable></arg>
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    </cmdsynopsis>
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    <cmdsynopsis>
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  <refsect1 id="description">
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    <title>DESCRIPTION</title>
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    <para>
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      <command>&COMMANDNAME;</command> is a program to control or
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      query the operation of the Mandos server
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      <citerefentry><refentrytitle>mandos</refentrytitle><manvolnum
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      >8</manvolnum></citerefentry>.
 
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      <command>&COMMANDNAME;</command> is a program to control the
 
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      operation of the Mandos server <citerefentry><refentrytitle
 
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      >mandos</refentrytitle><manvolnum>8</manvolnum></citerefentry>.
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    </para>
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    <para>
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      This program can be used to change client settings, approve or
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      </varlistentry>
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      <varlistentry>
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        <term><option>--dump-json</option></term>
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        <term><option>-j</option></term>
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        <listitem>
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          <para>
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            Dump client settings as JSON to standard output.
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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>--is-enabled</option></term>
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        <term><option>-V</option></term>
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        <listitem>
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      </varlistentry>
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      <varlistentry>
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        <term><option>--debug</option></term>
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        <listitem>
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          <para>
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            Show debug output; currently, this means show D-Bus calls.
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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>--check</option></term>
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        <listitem>
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          <para>
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    </para>
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  </refsect1>
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  <refsect1 id="bugs">
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    <title>BUGS</title>
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    <xi:include href="bugs.xml"/>
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  </refsect1>
 
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<!--   <refsect1 id="bugs"> -->
 
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<!--     <title>BUGS</title> -->
 
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<!--     <para> -->
 
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<!--     </para> -->
 
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<!--   </refsect1> -->
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  <refsect1 id="example">
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    <title>EXAMPLE</title>
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      <para>
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<!-- do not wrap this line -->
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<userinput>&COMMANDNAME; --timeout="PT5M" --interval="PT1M" foo1.example.org foo2.example.org</userinput>
 
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<userinput>&COMMANDNAME; --timeout="5m" --interval="1m" foo1.example.org foo2.example.org</userinput>
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      </para>
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    </informalexample>