/mandos/release

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<!ENTITY VERSION "1.0">

<!ENTITY COMMANDNAME "mandos">

]>

<refentry>

  <refentryinfo>

    <title>&COMMANDNAME;</title>

    <!-- NWalsh's docbook scripts use this to generate the footer: -->

    <productname>&COMMANDNAME;</productname>

    <productnumber>&VERSION;</productnumber>

    <authorgroup>

      <author>

	<firstname>Björn</firstname>

	<surname>Påhlsson</surname>

	<address>

	  <email>belorn@fukt.bsnet.se</email>

	</address>

      </author>

      <author>

	<firstname>Teddy</firstname>

	<surname>Hogeborn</surname>

	<address>

	  <email>teddy@fukt.bsnet.se</email>

	</address>

      </author>

    </authorgroup>

    <copyright>

      <year>2008</year>

      <holder>Teddy Hogeborn</holder>

      <holder>Björn Påhlsson</holder>

    </copyright>

    <legalnotice>

      <para>

	This manual page is free software: you can redistribute it

	and/or modify it under the terms of the GNU General Public

	License as published by the Free Software Foundation,

	either version 3 of the License, or (at your option) any

	later version.

      </para>

      <para>

	This manual page is distributed in the hope that it will

	be useful, but WITHOUT ANY WARRANTY; without even the

	implied warranty of MERCHANTABILITY or FITNESS FOR A

	PARTICULAR PURPOSE.  See the GNU General Public License

	for more details.

      </para>

      <para>

	You should have received a copy of the GNU General Public

	License along with this program; If not, see

	<ulink url="http://www.gnu.org/licenses/"/>.

      </para>

    </legalnotice>

  </refentryinfo>

  <refmeta>

    <refentrytitle>&COMMANDNAME;</refentrytitle>

    <manvolnum>8</manvolnum>

  </refmeta>

  <refnamediv>

    <refname><command>&COMMANDNAME;</command></refname>

    <refpurpose>

      Sends encrypted passwords to authenticated Mandos clients

    </refpurpose>

  </refnamediv>

  <refsynopsisdiv>

    <cmdsynopsis>

      <command>&COMMANDNAME;</command>

      <arg choice='opt'>--interface<arg choice='plain'>IF</arg></arg>

      <arg choice='opt'>--address<arg choice='plain'>ADDRESS</arg></arg>

      <arg choice='opt'>--port<arg choice='plain'>PORT</arg></arg>

      <arg choice='opt'>--priority<arg choice='plain'>PRIORITY</arg></arg>

      <arg choice='opt'>--servicename<arg choice='plain'>NAME</arg></arg>

      <arg choice='opt'>--configdir<arg choice='plain'>DIRECTORY</arg></arg>

      <arg choice='opt'>--debug</arg>

    </cmdsynopsis>

    <cmdsynopsis>

      <command>&COMMANDNAME;</command>

      <arg choice='opt'>-i<arg choice='plain'>IF</arg></arg>

      <arg choice='opt'>-a<arg choice='plain'>ADDRESS</arg></arg>

      <arg choice='opt'>-p<arg choice='plain'>PORT</arg></arg>

      <arg choice='opt'>--priority<arg choice='plain'>PRIORITY</arg></arg>

      <arg choice='opt'>--servicename<arg choice='plain'>NAME</arg></arg>

      <arg choice='opt'>--configdir<arg choice='plain'>DIRECTORY</arg></arg>

      <arg choice='opt'>--debug</arg>

    </cmdsynopsis>

    <cmdsynopsis>

      <command>&COMMANDNAME;</command>

      <arg choice='plain'>--help</arg>

    </cmdsynopsis>

    <cmdsynopsis>

      <command>&COMMANDNAME;</command>

      <arg choice='plain'>--version</arg>

    </cmdsynopsis>

    <cmdsynopsis>

      <command>&COMMANDNAME;</command>

      <arg choice='plain'>--check</arg>

    </cmdsynopsis>    

  </refsynopsisdiv>

  <refsect1 id="description">

    <title>DESCRIPTION</title>

    <para>

      <command>&COMMANDNAME;</command> is a server daemon which

      handles incoming request for passwords for a pre-defined list of

      client host computers.  The Mandos server uses Zeroconf to

      announce itself on the local network, and uses GnuTLS to

      communicate securely with and to authenticate the clients.

      Mandos uses IPv6 link-local addresses, since the clients are

      assumed to not have any other addresses configured yet.  Any

      authenticated client is then given the pre-encrypted password

      for that specific client.

    </para>

  </refsect1>  

  <refsect1 id="purpose">

    <title>PURPOSE</title>

    <para>

      The purpose of this is to enable <emphasis>remote and unattended

      rebooting</emphasis> of any client host computer with an

      <emphasis>encrypted root file system</emphasis>.  The client

      host computer should start a Mandos client in the initial RAM

      disk environment, the Mandos client program communicates with

      this server program to get an encrypted password, which is then

      decrypted and used to unlock the encrypted root file system.

      The client host computer can then continue its boot sequence

      normally.

    </para>

  </refsect1>  

  <refsect1 id="options">

    <title>OPTIONS</title>

    <variablelist>

      <varlistentry>

	<term><literal>-h</literal>, <literal>--help</literal></term>

	<listitem>

	  <para>

	    Show a help message and exit

	  </para>

	</listitem>

      </varlistentry>

      <varlistentry>

	<term><literal>-i</literal>, <literal>--interface <replaceable>

	IF</replaceable></literal></term>

	<listitem>

	  <para>

	    Only announce the server and listen to requests on network

	    interface <replaceable>IF</replaceable>.  Default is to

	    use all available interfaces.

	  </para>

	</listitem>

      </varlistentry>      

      <varlistentry>

	<term><literal>-a</literal>, <literal>--address <replaceable>

	ADDRESS</replaceable></literal></term>

	<listitem>

	  <para>

	    If this option is used, the server will only listen to a

	    specific address.  This must currently be an IPv6 address;

	    an IPv4 address can be specified using the

	    "<literal>::FFFF:192.0.2.3</literal>" syntax.  Also, if a

	    link-local address is specified, an interface should be

	    set, since a link-local address is only valid on a single

	    interface.  By default, the server will listen to all

	    available addresses.

	  </para>

	</listitem>

      </varlistentry>          

      <varlistentry>

	<term><literal>-p</literal>, <literal>--port <replaceable>

	PORT</replaceable></literal></term>

	<listitem>

	  <para>

	    If this option is used, the server to bind to that

	    port. By default, the server will listen to an arbitrary

	    port given by the operating system.

	  </para>

	</listitem>

      </varlistentry>          

      <varlistentry>

	<term><literal>--check</literal></term>

	<listitem>

	  <para>

	    Run the server's self-tests.  This includes any unit

	    tests, etc.

	  </para>

	</listitem>

      </varlistentry>      

      <varlistentry>

	<term><literal>--debug</literal></term>

	<listitem>

	  <para>

	    If the server is run in debug mode, it will run in the

	    foreground and print a lot of debugging information.  The

	    default is <emphasis>not</emphasis> to run in debug mode.

	  </para>

	</listitem>

      </varlistentry>

      <varlistentry>

	<term><literal>--priority <replaceable>

	PRIORITY</replaceable></literal></term>

	<listitem>

	  <para>

	    GnuTLS priority string for the TLS handshake with the

	    clients.  See

	    <citerefentry><refentrytitle>gnutls_priority_init

	    </refentrytitle><manvolnum>3</manvolnum></citerefentry>

	    for the syntax.  The default is

	    "<literal>SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP</literal>".

	    <emphasis>Warning</emphasis>: changing this may make the

	    TLS handshake fail, making communication with clients

	    impossible.

	  </para>

	</listitem>

      </varlistentry>      

      <varlistentry>

	<term><literal>--servicename <replaceable>NAME</replaceable>

	</literal></term>

	<listitem>

	  <para>

	    Zeroconf service name.  The default is

	    "<literal>Mandos</literal>".  You only need to change this

	    if you for some reason want to run more than one server on

	    the same <emphasis>host</emphasis>.  If there are name

	    collisions on the same <emphasis>network</emphasis>, the

	    new server will automatically rename itself to "Mandos

	    #2", etc.

	  </para>

	</listitem>

      </varlistentry>     

      <varlistentry>

	<term><literal>--configdir <replaceable>DIR</replaceable>

	</literal></term>

	<listitem>

	  <para>

	    Directory to search for configuration files.  Default is

	    "<literal>/etc/mandos</literal>".  See <citerefentry>

	    <refentrytitle>mandos.conf</refentrytitle>

	    <manvolnum>5</manvolnum></citerefentry> and <citerefentry>

	    <refentrytitle>mandos-clients.conf</refentrytitle>

	    <manvolnum>5</manvolnum></citerefentry>.

	  </para>

	</listitem>

      </varlistentry>

      <varlistentry>

	<term><literal>--version</literal></term>

	<listitem>

	  <para>

	    Prints the program version and exit.

	  </para>

	</listitem>

      </varlistentry>      

    </variablelist>

  </refsect1>

  <refsect1 id="protocol">

    <title>NETWORK PROTOCOL</title>

    <para>

      The Mandos server announces itself as a Zeroconf service of type

      "<literal>_mandos._tcp</literal>".  The Mandos client connects

      to the announced address and port, and sends a line of text

      where the first whitespace-separated field is the protocol

      version, which currently is "<literal>1</literal>".  The client

      and server then start a TLS protocol handshake with a slight

      quirk: the Mandos server program acts as a TLS "client" while

      the connecting Mandos client acts as a TLS "server".  The Mandos

      client must supply an OpenPGP certificate, and the fingerprint

      of this certificate is used by the Mandos server to look up (in

      a list read from a file at start time) which binary blob to give

      the client.  No other authentication or authorization is done by

      the server.

    </para>

    <informaltable><tgroup cols="3"><thead>

      <row>

	<entry>Mandos Client</entry>

	<entry>Direction</entry>

	<entry>Mandos Server</entry>

      </row>

      </thead><tbody>

      <row>

	<entry>Connect</entry>

	<entry>-><!-- &rarr; --></entry>

      </row>

      <row>

	<entry>"<literal>1\r\en</literal>"</entry>

	<entry>-><!-- &rarr; --></entry>

      </row>

      <row>

	<entry>TLS handshake</entry>

	<entry>&lt;-><!-- &xharr; --></entry>

	<entry>TLS handshake</entry>

      </row>

      <row>

	<entry>OpenPGP public key (part of TLS handshake)</entry>

	<entry>-><!-- &rarr; --></entry>

      </row>

      <row>

	<entry/>

	<entry>&lt;-<!-- &larr; --></entry>

	<entry>Binary blob</entry>

      </row>

      <row>

	<entry/>

	<entry>&lt;-<!-- &larr; --></entry>

	<entry>Close</entry>

      </row>

    </tbody></tgroup></informaltable>

  </refsect1>

  <refsect1 id="logging">

    <title>LOGGING</title>

    <para>

      The server will log a lot of information with various severity

      levels to

      <citerefentry><refentrytitle>syslog</refentrytitle>

      <manvolnum>8</manvolnum></citerefentry>.  With the

      <option>--debug</option> option, it will log even more messages,

      and also show them on the console.

    </para>

  </refsect1>

  <refsect1 id="exit_status">

    <title>EXIT STATUS</title>

    <para>

      The server will exit with a non-zero exit status only when a

      critical error is encountered.

    </para>

  </refsect1>

  <refsect1 id="file">

    <title>FILES</title>

    <para>

      <itemizedlist>

	<listitem><para>

	  <filename>/etc/mandos/mandos.conf</filename>  See <citerefentry>

	    <refentrytitle>mandos.conf</refentrytitle>

	    <manvolnum>5</manvolnum></citerefentry>.

	</para></listitem>

	<listitem><para>

	  <filename>/etc/mandos/clients.conf</filename> See <citerefentry>

	    <refentrytitle>mandos-clients.conf</refentrytitle>

	    <manvolnum>5</manvolnum></citerefentry>.

	</para></listitem>

	<listitem><para>

	  <filename>/var/run/mandos/mandos.pid</filename>

	</para></listitem>

      </itemizedlist>

    </para>

  </refsect1>  

  <refsect1 id="bugs">

    <title>BUGS</title>

    <para>

    </para>

  </refsect1>  

  <refsect1 id="examples">

    <title>EXAMPLES</title>

    <para>

    </para>

  </refsect1>

  <refsect1 id="security">

    <title>SECURITY</title>

    <para>

    </para>

  </refsect1>

  <refsect1 id="see_also">

    <title>SEE ALSO</title>

    <itemizedlist spacing="compact">

      <listitem><para>

	<citerefentry><refentrytitle>password-request</refentrytitle>

	<manvolnum>8mandos</manvolnum></citerefentry>

      </para></listitem>

      <listitem><para>

	<citerefentry><refentrytitle>plugin-runner</refentrytitle>

	<manvolnum>8mandos</manvolnum></citerefentry>

      </para></listitem>

      <listitem><para>

	<ulink url="http://www.zeroconf.org/">Zeroconf</ulink>

      </para></listitem>

      <listitem><para>

	<ulink url="http://www.avahi.org/">Avahi</ulink>

      </para></listitem>

      <listitem><para>

	<ulink

	    url="http://www.gnu.org/software/gnutls/">GnuTLS</ulink>

      </para></listitem>

      <listitem><para>

	<citation>RFC 4880: <citetitle>OpenPGP Message

	Format</citetitle></citation>

      </para></listitem>

      <listitem><para>

	<citation>RFC 5081: <citetitle>Using OpenPGP Keys for

	Transport Layer Security</citetitle></citation>

      </para></listitem>

      <listitem><para>

	<citation>RFC 4291: <citetitle>IP Version 6 Addressing

	Architecture</citetitle>, section 2.5.6, Link-Local IPv6

	Unicast Addresses</citation>

      </para></listitem>

    </itemizedlist>

  </refsect1>

</refentry>