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  • Committer: Teddy Hogeborn
  • Date: 2015-07-09 20:32:52 UTC
  • Revision ID: teddy@recompile.se-20150709203252-u10p7trfsxc1a9yp
Install client Diffie-Hellman parameters into initramfs.

* debian/control (Package: mandos-client/Recommends): Added
  "gnutls-bin | openssl" (to generate DH parameters).
* debian/mandos-client.postinst (create_dh_params): New function
                                                    called on package
                                                    configure.
* plugins.d/mandos-client.c (main): Bug fix: Work around Debian bug
                                    #633582 also for the
                                    "client-dhparams.pem" file.

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plugins.d/mandos-client.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-client">
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<!ENTITY TIMESTAMP "2019-02-10">
 
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<!ENTITY TIMESTAMP "2015-07-08">
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<!ENTITY % common SYSTEM "../common.ent">
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%common;
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]>
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    <copyright>
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      <year>2008</year>
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      <year>2009</year>
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      <year>2010</year>
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      <year>2011</year>
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      <year>2012</year>
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      <year>2013</year>
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      <year>2014</year>
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      <year>2015</year>
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      <year>2016</year>
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      <year>2017</year>
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      <year>2018</year>
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      <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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        <replaceable>FILE</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>--tls-privkey
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        <replaceable>FILE</replaceable></option></arg>
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        <arg choice="plain"><option>-t
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        <replaceable>FILE</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>--tls-pubkey
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        <replaceable>FILE</replaceable></option></arg>
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        <arg choice="plain"><option>-T
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        <replaceable>FILE</replaceable></option></arg>
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      </group>
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      <sbr/>
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      <arg>
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        <option>--priority <replaceable>STRING</replaceable></option>
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      </arg>
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      brings up network interfaces, uses the interfaces’ IPv6
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      link-local addresses to get network connectivity, uses Zeroconf
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      to find servers on the local network, and communicates with
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      servers using TLS with a raw public key to ensure authenticity
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      and confidentiality.  This client program keeps running, trying
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      all servers on the network, until it receives a satisfactory
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      reply or a TERM signal.  After all servers have been tried, all
 
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      servers using TLS with an OpenPGP key to ensure authenticity and
 
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      confidentiality.  This client program keeps running, trying all
 
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      servers on the network, until it receives a satisfactory reply
 
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      or a TERM signal.  After all servers have been tried, all
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      servers are periodically retried.  If no servers are found it
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      will wait indefinitely for new servers to appear.
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    </para>
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      </varlistentry>
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      <varlistentry>
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        <term><option>--tls-pubkey=<replaceable
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        >FILE</replaceable></option></term>
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        <term><option>-T
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        <replaceable>FILE</replaceable></option></term>
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        <listitem>
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          <para>
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            TLS raw public key file name.  The default name is
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            <quote><filename>/conf/conf.d/mandos/tls-pubkey.pem</filename
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            ></quote>.
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          </para>
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        </listitem>
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      </varlistentry>
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      <varlistentry>
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        <term><option>--tls-privkey=<replaceable
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        >FILE</replaceable></option></term>
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        <term><option>-t
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        <replaceable>FILE</replaceable></option></term>
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        <listitem>
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          <para>
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            TLS secret key file name.  The default name is
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            <quote><filename>/conf/conf.d/mandos/tls-privkey.pem</filename
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            ></quote>.
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          </para>
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        </listitem>
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      </varlistentry>
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      <varlistentry>
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        <term><option>--priority=<replaceable
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        >STRING</replaceable></option></term>
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        <listitem>
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          <para>
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            Sets the number of bits to use for the prime number in the
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            TLS Diffie-Hellman key exchange.  The default value is
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            selected automatically based on the GnuTLS security
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            profile set in its priority string.  Note that if the
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            <option>--dh-params</option> option is used, the values
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            from that file will be used instead.
 
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            selected automatically based on the OpenPGP key.  Note
 
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            that if the <option>--dh-params</option> option is used,
 
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            the values from that file will be used instead.
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          </para>
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        </listitem>
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      </varlistentry>
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        </listitem>
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      </varlistentry>
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      <varlistentry>
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        <term><filename>/conf/conf.d/mandos/tls-pubkey.pem</filename
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        ></term>
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        <term><filename>/conf/conf.d/mandos/tls-privkey.pem</filename
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        ></term>
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        <listitem>
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          <para>
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            Public and private raw key files, in <quote>PEM</quote>
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            format.  These are the default file names, they can be
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            changed with the <option>--tls-pubkey</option> and
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            <option>--tls-privkey</option> options.
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          </para>
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        </listitem>
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      </varlistentry>
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      <varlistentry>
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        <term><filename
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        class="directory">/lib/mandos/network-hooks.d</filename></term>
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        <listitem>
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    </variablelist>
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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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    </informalexample>
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    <informalexample>
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      <para>
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        Run in debug mode, and use custom keys:
 
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        Run in debug mode, and use a custom key:
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      </para>
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      <para>
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<!-- do not wrap this line -->
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<userinput>&COMMANDNAME; --debug --pubkey keydir/pubkey.txt --seckey keydir/seckey.txt --tls-pubkey keydir/tls-pubkey.pem --tls-privkey keydir/tls-privkey.pem</userinput>
 
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<userinput>&COMMANDNAME; --debug --pubkey keydir/pubkey.txt --seckey keydir/seckey.txt</userinput>
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      </para>
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    </informalexample>
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    <informalexample>
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      <para>
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        Run in debug mode, with custom keys, and do not use Zeroconf
 
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        Run in debug mode, with a custom key, and do not use Zeroconf
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        to locate a server; connect directly to the IPv6 link-local
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        address <quote><systemitem class="ipaddress"
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        >fe80::aede:48ff:fe71:f6f2</systemitem></quote>, port 4711,
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      <para>
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<!-- do not wrap this line -->
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<userinput>&COMMANDNAME; --debug --pubkey keydir/pubkey.txt --seckey keydir/seckey.txt --tls-pubkey keydir/tls-pubkey.pem --tls-privkey keydir/tls-privkey.pem --connect fe80::aede:48ff:fe71:f6f2:4711 --interface eth2</userinput>
 
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<userinput>&COMMANDNAME; --debug --pubkey keydir/pubkey.txt --seckey keydir/seckey.txt --connect fe80::aede:48ff:fe71:f6f2:4711 --interface eth2</userinput>
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      </para>
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    </informalexample>
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    <para>
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      The only remaining weak point is that someone with physical
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      access to the client hard drive might turn off the client
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      computer, read the OpenPGP and TLS keys directly from the hard
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      drive, and communicate with the server.  To safeguard against
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      this, the server is supposed to notice the client disappearing
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      and stop giving out the encrypted data.  Therefore, it is
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      important to set the timeout and checker interval values tightly
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      on the server.  See <citerefentry><refentrytitle
 
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      computer, read the OpenPGP keys directly from the hard drive,
 
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      and communicate with the server.  To safeguard against this, the
 
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      server is supposed to notice the client disappearing and stop
 
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      giving out the encrypted data.  Therefore, it is important to
 
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      set the timeout and checker interval values tightly on the
 
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      server.  See <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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      </varlistentry>
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      <varlistentry>
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        <term>
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          <ulink url="https://www.gnutls.org/">GnuTLS</ulink>
 
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          <ulink url="http://www.gnu.org/software/gnutls/"
 
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          >GnuTLS</ulink>
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        </term>
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      <listitem>
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        <para>
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          GnuTLS is the library this client uses to implement TLS for
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          communicating securely with the server, and at the same time
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          send the public key to the server.
 
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          send the public OpenPGP key to the server.
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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>
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          <ulink url="https://www.gnupg.org/related_software/gpgme/"
 
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          <ulink url="http://www.gnupg.org/related_software/gpgme/"
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                 >GPGME</ulink>
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        </term>
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        <listitem>
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      </varlistentry>
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      <varlistentry>
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        <term>
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          RFC 5246: <citetitle>The Transport Layer Security (TLS)
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          Protocol Version 1.2</citetitle>
 
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          RFC 4346: <citetitle>The Transport Layer Security (TLS)
 
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          Protocol Version 1.1</citetitle>
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        </term>
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      <listitem>
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        <para>
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          TLS 1.2 is the protocol implemented by GnuTLS.
 
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          TLS 1.1 is the protocol implemented by GnuTLS.
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        </para>
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      </listitem>
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      </varlistentry>
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      </varlistentry>
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      <varlistentry>
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        <term>
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          RFC 7250: <citetitle>Using Raw Public Keys in Transport
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          Layer Security (TLS) and Datagram Transport Layer Security
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          (DTLS)</citetitle>
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        </term>
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      <listitem>
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        <para>
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          This is implemented by GnuTLS in version 3.6.6 and is, if
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          present, used by this program so that raw public keys can be
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          used.
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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>
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          RFC 6091: <citetitle>Using OpenPGP Keys for Transport Layer
 
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          RFC 5081: <citetitle>Using OpenPGP Keys for Transport Layer
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          Security</citetitle>
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        </term>
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      <listitem>
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        <para>
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          This is implemented by GnuTLS before version 3.6.0 and is,
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          if present, used by this program so that OpenPGP keys can be
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          used.
 
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          This is implemented by GnuTLS and used by this program so
 
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          that OpenPGP keys can be used.
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        </para>
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      </listitem>
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      </varlistentry>