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  • Committer: Teddy Hogeborn
  • Date: 2015-03-10 18:52:09 UTC
  • mto: (237.7.304 trunk)
  • mto: This revision was merged to the branch mainline in revision 325.
  • Revision ID: teddy@recompile.se-20150310185209-lxuovbu09zwyk9bx
Automatically determine the number of DH bits in the TLS handshake.

Instead of using a default value of 1024, check the OpenPGP key and
determine an appropriate number of DH bits to use, (using GnuTLS
functions made for this).  Document this new default behavior.

* plugins.d/mandos-client.c (safe_string): New function.
  (init_gnutls_global): If not specified, determine the number of DH
                        bits to use, based on the OpenPGP key.
* plugins.d/mandos-client.xml (OPTIONS): Document this new default of
                                         the --dh-bits option.

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

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mandos-keygen.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 VERSION "1.0">
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<!ENTITY COMMANDNAME "mandos-keygen">
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<!ENTITY TIMESTAMP "2008-09-12">
 
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<!ENTITY TIMESTAMP "2014-06-22">
 
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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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    <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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    <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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      <holder>Teddy Hogeborn</holder>
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      <holder>Björn Påhlsson</holder>
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    </copyright>
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        <replaceable>TIME</replaceable></option></arg>
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      </group>
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      <sbr/>
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      <arg><option>--force</option></arg>
 
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      <group>
 
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        <arg choice="plain"><option>--force</option></arg>
 
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        <arg choice="plain"><option>-f</option></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>--password</option></arg>
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        <arg choice="plain"><option>-p</option></arg>
 
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        <arg choice="plain"><option>--passfile
 
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        <replaceable>FILE</replaceable></option></arg>
 
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        <arg choice="plain"><option>-F</option>
 
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        <replaceable>FILE</replaceable></arg>
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      </group>
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      <sbr/>
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      <group>
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        <arg choice="plain"><option>-n
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        <replaceable>NAME</replaceable></option></arg>
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      </group>
 
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      <group>
 
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        <arg choice="plain"><option>--no-ssh</option></arg>
 
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        <arg choice="plain"><option>-S</option></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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    </para>
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    <para>
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      This program can also be used with the
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      <option>--password</option> option to generate a ready-made
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      section for <filename>clients.conf</filename> (see
 
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      <option>--password</option> or <option>--passfile</option>
 
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      options to generate a ready-made section for
 
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      <filename>clients.conf</filename> (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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        <listitem>
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          <para>
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            Target directory for key files.  Default is
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            <filename>/etc/mandos</filename>.
 
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            <filename class="directory">/etc/mandos</filename>.
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          </para>
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        </listitem>
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      </varlistentry>
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        <replaceable>TYPE</replaceable></option></term>
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        <listitem>
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          <para>
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            Key type.  Default is <quote>DSA</quote>.
 
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            Key type.  Default is <quote>RSA</quote>.
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          </para>
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        </listitem>
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      </varlistentry>
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        <replaceable>BITS</replaceable></option></term>
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        <listitem>
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          <para>
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            Key length in bits.  Default is 2048.
 
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            Key length in bits.  Default is 4096.
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          </para>
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        </listitem>
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      </varlistentry>
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        <replaceable>KEYTYPE</replaceable></option></term>
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        <listitem>
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          <para>
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            Subkey type.  Default is <quote>ELG-E</quote> (Elgamal
 
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            Subkey type.  Default is <quote>RSA</quote> (Elgamal
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            encryption-only).
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          </para>
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        </listitem>
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        <replaceable>BITS</replaceable></option></term>
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        <listitem>
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          <para>
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            Subkey length in bits.  Default is 2048.
 
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            Subkey length in bits.  Default is 4096.
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          </para>
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        </listitem>
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      </varlistentry>
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        <replaceable>TEXT</replaceable></option></term>
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        <listitem>
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          <para>
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            Comment field for key.  The default value is
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            <quote><literal>Mandos client key</literal></quote>.
 
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            Comment field for key.  Default is empty.
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          </para>
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        </listitem>
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      </varlistentry>
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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>--passfile
 
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        <replaceable>FILE</replaceable></option></term>
 
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        <term><option>-F
 
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        <replaceable>FILE</replaceable></option></term>
 
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        <listitem>
 
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          <para>
 
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            The same as <option>--password</option>, but read from
 
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            <replaceable>FILE</replaceable>, not the terminal.
 
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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>--no-ssh</option></term>
 
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        <term><option>-S</option></term>
 
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        <listitem>
 
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          <para>
 
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            When <option>--password</option> or
 
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            <option>--passfile</option> is given, this option will
 
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            prevent <command>&COMMANDNAME;</command> from calling
 
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            <command>ssh-keyscan</command> to get an SSH fingerprint
 
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            for this host and, if successful, output suitable config
 
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            options to use this fingerprint as a
 
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            <option>checker</option> option in the output.  This is
 
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            otherwise the default behavior.
 
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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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    </variablelist>
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  </refsect1>
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  <refsect1 id="file">
 
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  <refsect1 id="files">
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    <title>FILES</title>
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    <para>
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      Use the <option>--dir</option> option to change where
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        </listitem>
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      </varlistentry>
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      <varlistentry>
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        <term><filename>/tmp</filename></term>
 
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        <term><filename class="directory">/tmp</filename></term>
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        <listitem>
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          <para>
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            Temporary files will be written here if
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    </informalexample>
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    <informalexample>
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      <para>
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        Prompt for a password, encrypt it with the key in
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        <filename>/etc/mandos</filename> and output a section suitable
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        for <filename>clients.conf</filename>.
 
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        Prompt for a password, encrypt it with the key in <filename
 
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        class="directory">/etc/mandos</filename> and output a section
 
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        suitable for <filename>clients.conf</filename>.
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      </para>
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      <para>
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        <userinput>&COMMANDNAME; --password</userinput>
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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><refentrytitle>intro</refentrytitle>
 
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      <manvolnum>8mandos</manvolnum></citerefentry>,
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      <citerefentry><refentrytitle>gpg</refentrytitle>
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      <manvolnum>1</manvolnum></citerefentry>,
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      <citerefentry><refentrytitle>mandos-clients.conf</refentrytitle>
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      <citerefentry><refentrytitle>mandos</refentrytitle>
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      <manvolnum>8</manvolnum></citerefentry>,
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      <citerefentry><refentrytitle>mandos-client</refentrytitle>
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      <manvolnum>8mandos</manvolnum></citerefentry>
 
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      <manvolnum>8mandos</manvolnum></citerefentry>,
 
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      <citerefentry><refentrytitle>ssh-keyscan</refentrytitle>
 
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      <manvolnum>1</manvolnum></citerefentry>
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    </para>
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  </refsect1>
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