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<?xml version='1.0' encoding='UTF-8'?>
<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
	"http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
<!ENTITY VERSION "1.0">
<!ENTITY CONFNAME "mandos-clients.conf">
<!ENTITY CONFPATH "<filename>/etc/mandos/clients.conf</filename>">
<!ENTITY TIMESTAMP "2008-08-29">
]>

<refentry>
  <refentryinfo>
    <title>&CONFNAME;</title>
    <!-- NWalsh’s docbook scripts use this to generate the footer: -->
    <productname>&CONFNAME;</productname>
    <productnumber>&VERSION;</productnumber>
    <date>&TIMESTAMP;</date>
    <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>&CONFNAME;</refentrytitle>
    <manvolnum>5</manvolnum>
  </refmeta>
  
  <refnamediv>
    <refname><filename>&CONFNAME;</filename></refname>
    <refpurpose>
      Configuration file for the Mandos server
    </refpurpose>
  </refnamediv>

  <refsynopsisdiv>
    <synopsis>
      &CONFPATH;
    </synopsis>
  </refsynopsisdiv>

  <refsect1 id="description">
    <title>DESCRIPTION</title>
    <para>
      The file &CONFPATH; is a configuration file for <citerefentry
      ><refentrytitle>mandos</refentrytitle>
      <manvolnum>8</manvolnum></citerefentry>, read by it at startup.
      The file needs to list all clients that should be able to use
      the service.  All clients listed will be regarded as valid, even
      if a client was declared invalid in a previous run of the
      server.
    </para>
    <para>
      The format starts with a <literal>[<replaceable>section
      header</replaceable>]</literal> which is either
      <literal>[DEFAULT]</literal> or <literal>[<replaceable>client
      name</replaceable>]</literal>.  The <replaceable>client
      name</replaceable> can be anything, and is not tied to a host
      name.  Following the section header is any number of
      <quote><varname><replaceable>option</replaceable
      ></varname>=<replaceable>value</replaceable></quote> entries,
      with continuations in the style of RFC 822.  <quote><varname
      ><replaceable>option</replaceable></varname>: <replaceable
      >value</replaceable></quote> is also accepted.  Note that
      leading whitespace is removed from values.  Values can contain
      format strings which refer to other values in the same section,
      or values in the <quote>DEFAULT</quote> section (see <xref
      linkend="expansion"/>).  Lines beginning with <quote>#</quote>
      or <quote>;</quote> are ignored and may be used to provide
      comments.
    </para>
  </refsect1>
  
  <refsect1 id="options">
    <title>OPTIONS</title>
    <para>
      <emphasis>Note:</emphasis> all option values are subject to
      start time expansion, see <xref linkend="expansion"/>.
    </para>
    <para>
      Uknown options are ignored.  The used options are as follows:
    </para>

    <variablelist>

      <varlistentry>
	<term><literal><varname>timeout</varname></literal></term>
	<listitem>
	  <synopsis><literal>timeout = </literal><replaceable
	  >TIME</replaceable>
	  </synopsis>
	  <para>
	    The timeout is how long the server will wait for a
	    successful checker run until a client is considered
	    invalid - that is, ineligible to get the data this server
	    holds.  By default Mandos will use 1 hour.
	  </para>
	  <para>
	    The <replaceable>TIME</replaceable> is specified as a
	    space-separated number of values, each of which is a
	    number and a one-character suffix.  The suffix must be one
	    of <quote>d</quote>, <quote>s</quote>, <quote>m</quote>,
	    <quote>h</quote>, and <quote>w</quote> for days, seconds,
	    minutes, hours, and weeks, respectively.  The values are
	    added together to give the total time value, so all of
	    <quote><literal>330s</literal></quote>,
	    <quote><literal>110s 110s 110s</literal></quote>, and
	    <quote><literal>5m 30s</literal></quote> will give a value
	    of five minutes and thirty seconds.
	  </para>
	</listitem>
      </varlistentry>

      <varlistentry>
	<term><literal><varname>interval</varname></literal></term>
	<listitem>
	  <synopsis><literal>interval = </literal><replaceable
	  >TIME</replaceable>
	  </synopsis>
	  <para>
	    How often to run the checker to confirm that a client is
	    still up.  <emphasis>Note:</emphasis> a new checker will
	    not be started if an old one is still running.  The server
	    will wait for a checker to complete until the above
	    <quote><varname>timeout</varname></quote> occurs, at which
	    time the client will be marked invalid, and any running
	    checker killed.  The default interval is 5 minutes.
	  </para>
	  <para>
	    The format of <replaceable>TIME</replaceable> is the same
	    as for <varname>timeout</varname> above.
	  </para>
	</listitem>
      </varlistentry>      

      <varlistentry>
	<term><literal>checker</literal></term>
	<listitem>
	  <synopsis><literal>checker = </literal><replaceable
	  >COMMAND</replaceable>
	  </synopsis>
	  <para>
	    This option allows you to override the default shell
	    command that the server will use to check if the client is
	    still up.  Any output of the command will be ignored, only
	    the exit code is checked:  If the exit code of the command
	    is zero, the client is considered up.  The command will be
	    run using <quote><command><filename>/bin/sh</filename>
	    <option>-c</option></command></quote>, so
	    <varname>PATH</varname> will be searched.  The default
	    value for the checker command is <quote><literal
	    ><command>fping</command> <option>-q</option> <option
	    >--</option> %(host)s</literal></quote>.
	  </para>
	  <para>
	    In addition to normal start time expansion, this option
	    will also be subject to runtime expansion; see <xref
	    linkend="expansion"/>.
	  </para>
	</listitem>
      </varlistentry>
      
      <varlistentry>
	<term><literal>fingerprint</literal></term>
	<listitem>
	  <synopsis><literal>fingerprint = </literal><replaceable
	  >HEXSTRING</replaceable>
	  </synopsis>
	  <para>
	    This option sets the OpenPGP fingerprint that identifies
	    the public key that clients authenticate themselves with
	    through TLS.  The string needs to be in hexidecimal form,
	    but spaces or upper/lower case are not significant.
	  </para>
	</listitem>
      </varlistentry>
      
      <varlistentry>
	<term><literal>secret</literal></term>
	<listitem>
	  <synopsis><literal>secret = </literal><replaceable
	  >BASE64_ENCODED_DATA</replaceable>
	  </synopsis>
	  <para>
	    If present, this option must be set to a string of
	    base64-encoded binary data.  It will be decoded and sent
	    to the client matching the above
	    <option>fingerprint</option>.  This should, of course, be
	    OpenPGP encrypted data, decryptable only by the client.
	    The program <citerefentry><refentrytitle><command
	    >mandos-keygen</command></refentrytitle><manvolnum
	    >8</manvolnum></citerefentry> can, using its
	    <option>--password</option> option, be used to generate
	    this, if desired.
	  </para>
	  <para>
	    Note: this value of this option will probably be very
	    long.  A useful feature to avoid having unreadably-long
	    lines is that a line beginning with white space adds to
	    the value of the previous line, RFC 822-style.
	  </para>
	  <para>
	    If this option is not specified, the <option
	    >secfile</option> option is used instead, but one of them
	    <emphasis>must</emphasis> be present.
	  </para>
	</listitem>
      </varlistentry>

      <varlistentry>
	<term><literal>secfile</literal></term>
	<listitem>
	  <synopsis><literal>secfile = </literal><replaceable
	  >FILENAME</replaceable>
	  </synopsis>
	  <para>
	    The same as <option>secret</option>, but the secret data
	    is in an external file.  The contents of the file should
	    <emphasis>not</emphasis> be base64-encoded, but will be
	    sent to clients verbatim.
	  </para>
	  <para>
	    This option is only used, and <emphasis>must</emphasis> be
	    present, if <option>secret</option> is not specified.
	  </para>
	</listitem>
      </varlistentry>

      <varlistentry>
	<term><literal>host</literal></term>
	<listitem>
	  <synopsis><literal>host = </literal><replaceable
	  >STRING</replaceable>
	  </synopsis>
	  <para>
	    Host name for this client.  This is not used by the server
	    directly, but can be, and is by default, used by the
	    checker.  See the <option>checker</option> option.
	  </para>
	</listitem>
      </varlistentry>
      
    </variablelist>
  </refsect1>  
  
  <refsect1 id="expansion">
    <title>EXPANSION</title>
    <para>
      There are two forms of expansion: Start time expansion and
      runtime expansion.
    </para>
    <refsect2 id="start_time_expansion">
      <title>START TIME EXPANSION</title>
      <para>
	Any string in an option value of the form
	<quote><literal>%(<replaceable>foo</replaceable>)s</literal
	></quote> will be replaced by the value of the option
	<varname>foo</varname> either in the same section, or, if it
	does not exist there, the <literal>[DEFAULT]</literal>
	section.  This is done at start time, when the configuration
	file is read.
      </para>
      <para>
	Note that this means that, in order to include an actual
	percent character (<quote>%</quote>) in an option value, two
	percent characters in a row (<quote>%%</quote>) must be
	entered.
      </para>
    </refsect2>
    <refsect2 id="runtime_expansion">
      <title>RUNTIME EXPANSION</title>
      <para>
	This is currently only done for the <varname>checker</varname>
	option.
      </para>
      <para>
	Any string in an option value of the form
	<quote><literal>%%(<replaceable>foo</replaceable>)s</literal
	></quote> will be replaced by the value of the attribute
	<varname>foo</varname> of the internal
	<quote><classname>Client</classname></quote> object.  See the
	source code for details, and let the authors know of any
	attributes that are useful so they may be preserved to any new
	versions of this software.
      </para>
      <para>
	Note that this means that, in order to include an actual
	percent character (<quote>%</quote>) in a
	<varname>checker</varname> option, <emphasis>four</emphasis>
	percent characters in a row (<quote>%%%%</quote>) must be
	entered.  Also, a bad format here will lead to an immediate
	but <emphasis>silent</emphasis> run-time fatal exit; debug
	mode is needed to track down an error of this kind.
      </para>
    </refsect2>

  </refsect1>  
  
  <refsect1 id="files">
    <title>FILES</title>
    <para>
      The file described here is &CONFPATH;
    </para>
  </refsect1>
  
  <refsect1 id="bugs">
    <title>BUGS</title>
    <para>
      The format for specifying times for <varname>timeout</varname>
      and <varname>interval</varname> is not very good.
    </para>
    <para>
      The difference between
      <literal>%%(<replaceable>foo</replaceable>)s</literal> and
      <literal>%(<replaceable>foo</replaceable>)s</literal> is
      obscure.
    </para>
  </refsect1>
  
  <refsect1 id="example">
    <title>EXAMPLE</title>
    <informalexample>
      <programlisting>
[DEFAULT]
timeout = 1h
interval = 5m
checker = fping -q -- %(host)s

# Client "foo"
[foo]
fingerprint =  7788 2722 5BA7 DE53 9C5A  7CFA 59CF F7CD BD9A 5920
secret =
        hQIOA6QdEjBs2L/HEAf/TCyrDe5Xnm9esa+Pb/vWF9CUqfn4srzVgSu234
        REJMVv7lBSrPE2132Lmd2gqF1HeLKDJRSVxJpt6xoWOChGHg+TMyXDxK+N
        Xl89vGvdU1XfhKkVm9MDLOgT5ECDPysDGHFPDhqHOSu3Kaw2DWMV/iH9vz
        3Z20erVNbdcvyBnuojcoWO/6yfB5EQO0BXp7kcyy00USA3CjD5FGZdoQGI
        Tb8A/ar0tVA5crSQmaSotm6KmNLhrFnZ5BxX+TiE+eTUTqSloWRY6VAvqW
        QHC7OASxK5E6RXPBuFH5IohUA2Qbk5AHt99pYvsIPX88j2rWauOokoiKZo
        t/9leJ8VxO5l3wf/U64IH8bkPIoWmWZfd/nqh4uwGNbCgKMyT+AnvH7kMJ
        3i7DivfWl2mKLV0PyPHUNva0VQxX6yYjcOhj1R6fCr/at8/NSLe2OhLchz
        dC+Ls9h+kvJXgF8Sisv+Wk/1RadPLFmraRlqvJwt6Ww21LpiXqXHV2mIgq
        WnR98YgSvUi3TJHrUQiNc9YyBzuRo0AjgG2C9qiE3FM+Y28+iQ/sR3+bFs
        zYuZKVTObqiIslwXu7imO0cvvFRgJF/6u3HNFQ4LUTGhiM3FQmC6NNlF3/
        vJM2hwRDMcJqDd54Twx90Wh+tYz0z7QMsK4ANXWHHWHR0JchnLWmenzbtW
        5MHdW9AYsNJZAQSOpirE4Xi31CSlWAi9KV+cUCmWF5zOFy1x23P6PjdaRm
        4T2zw4dxS5NswXWU0sVEXxjs6PYxuIiCTL7vdpx8QjBkrPWDrAbcMyBr2O
        QlnHIvPzEArRQLo=
host = foo.example.org
interval = 1m

# Client "bar"
[bar]
fingerprint = 3e393aeaefb84c7e89e2f547b3a107558fca3a27
secfile = /etc/mandos/bar-secret
timeout = 15m

      </programlisting>
    </informalexample>
  </refsect1>  
  
  <refsect1 id="see_also">
    <title>SEE ALSO</title>
    <para>
      <citerefentry>
	<refentrytitle>mandos</refentrytitle>
	<manvolnum>8</manvolnum></citerefentry>, <citerefentry>
	<refentrytitle>mandos-keygen</refentrytitle>
	<manvolnum>8</manvolnum></citerefentry>, <citerefentry>
	<refentrytitle>mandos.conf</refentrytitle>
	<manvolnum>5</manvolnum></citerefentry>
    </para>
  </refsect1>
</refentry>
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