/mandos/trunk

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<!ENTITY CONFNAME "mandos-clients.conf">

<!ENTITY CONFPATH "<filename>/etc/mandos/clients.conf</filename>">

<!ENTITY TIMESTAMP "2019-02-10">

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<refentry xmlns:xi="http://www.w3.org/2001/XInclude">

  <refentryinfo>

    <title>Mandos Manual</title>

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

    <productname>Mandos</productname>

    <productnumber>&version;</productnumber>

    <date>&TIMESTAMP;</date>

    <authorgroup>

      <author>

	<firstname>Björn</firstname>

	<surname>Påhlsson</surname>

	<address>

	  <email>belorn@recompile.se</email>

	</address>

      </author>

      <author>

	<firstname>Teddy</firstname>

	<surname>Hogeborn</surname>

	<address>

	  <email>teddy@recompile.se</email>

	</address>

      </author>

    </authorgroup>

    <copyright>

      <year>2008</year>

      <year>2009</year>

      <year>2010</year>

      <year>2011</year>

      <year>2012</year>

      <year>2013</year>

      <year>2014</year>

      <year>2015</year>

      <year>2016</year>

      <year>2017</year>

      <year>2018</year>

      <year>2019</year>

      <holder>Teddy Hogeborn</holder>

      <holder>Björn Påhlsson</holder>

    </copyright>

    <xi:include href="legalnotice.xml"/>

  </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.  The settings in this file can be overridden by

      runtime changes to the server, which it saves across restarts.

      (See the section called <quote>PERSISTENT STATE</quote> in

      <citerefentry><refentrytitle>mandos</refentrytitle><manvolnum

      >8</manvolnum></citerefentry>.)  However, any <emphasis

      >changes</emphasis> to this file (including adding and removing

      clients) will, at startup, override changes done during runtime.

    </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>

      Unknown options are ignored.  The used options are as follows:

    </para>

    <variablelist>

      <varlistentry>

	<term><option>approval_delay<literal> = </literal><replaceable

	>TIME</replaceable></option></term>

	<listitem>

	  <para>

	    This option is <emphasis>optional</emphasis>.

	  </para>

	  <para>

	    How long to wait for external approval before resorting to

	    use the <option>approved_by_default</option> value.  The

	    default is <quote>PT0S</quote>, i.e. not to wait.

	  </para>

	  <para>

	    The format of <replaceable>TIME</replaceable> is the same

	    as for <varname>timeout</varname> below.

	  </para>

	</listitem>

      </varlistentry>

      <varlistentry>

	<term><option>approval_duration<literal> = </literal

        ><replaceable>TIME</replaceable></option></term>

	<listitem>

	  <para>

	    This option is <emphasis>optional</emphasis>.

	  </para>

	  <para>

	    How long an external approval lasts.  The default is 1

	    second.

	  </para>

	  <para>

	    The format of <replaceable>TIME</replaceable> is the same

	    as for <varname>timeout</varname> below.

	  </para>

	</listitem>

      </varlistentry>

      <varlistentry>

	<term><option>approved_by_default<literal> = </literal

          >{ <literal >1</literal> | <literal>yes</literal> | <literal

	  >true</literal> | <literal>on</literal> | <literal

	  >0</literal> | <literal>no</literal> | <literal

	  >false</literal> | <literal>off</literal> }</option></term>

	<listitem>

	  <para>

	    Whether to approve a client by default after

	    the <option>approval_delay</option>.  The default

	    is <quote>True</quote>.

	  </para>

	</listitem>

      </varlistentry>

      <varlistentry>

	<term><option>checker<literal> = </literal><replaceable

	>COMMAND</replaceable></option></term>

	<listitem>

	  <para>

	    This option is <emphasis>optional</emphasis>.

	  </para>

	  <para>

	    This option overrides 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>.  Note that

	    <command>mandos-keygen</command>, when generating output

	    to be inserted into this file, normally looks for an SSH

	    server on the Mandos client, and, if it finds one, outputs

	    a <option>checker</option> option to check for the

	    client’s SSH key fingerprint – this is more secure against

	    spoofing.

	  </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><option>extended_timeout<literal> = </literal><replaceable

	>TIME</replaceable></option></term>

	<listitem>

	  <para>

	    This option is <emphasis>optional</emphasis>.

	  </para>

	  <para>

	    Extended timeout is an added timeout that is given once

	    after a password has been sent successfully to a client.

	    The timeout is by default longer than the normal timeout,

	    and is used for handling the extra long downtime while a

	    machine is booting up.  Time to take into consideration

	    when changing this value is file system checks and quota

	    checks.  The default value is 15 minutes.

	  </para>

	  <para>

	    The format of <replaceable>TIME</replaceable> is the same

	    as for <varname>timeout</varname> below.

	  </para>

	</listitem>

      </varlistentry>

      <varlistentry>

	<term><option>fingerprint<literal> = </literal

	><replaceable>HEXSTRING</replaceable></option></term>

	<listitem>

	  <para>

	    This option is <emphasis>required</emphasis> if the

	    <option>key_id</option> is not set, and

	    <emphasis>optional</emphasis> otherwise.

	  </para>

	  <para>

	    This option sets the OpenPGP fingerprint that (before

	    GnuTLS 3.6.0) identified the public key that clients

	    authenticate themselves with through TLS.  The string

	    needs to be in hexadecimal form, but spaces or upper/lower

	    case are not significant.

	  </para>

	</listitem>

      </varlistentry>

      <varlistentry>

	<term><option>key_id<literal> = </literal

	><replaceable>HEXSTRING</replaceable></option></term>

	<listitem>

	  <para>

	    This option is <emphasis>required</emphasis> if the

	    <option>fingerprint</option> is not set, and

	    <emphasis>optional</emphasis> otherwise.

	  </para>

	  <para>

	    This option sets the certificate key ID that (with GnuTLS

	    3.6.6 or later) identifies the public key that clients

	    authenticate themselves with through TLS.  The string

	    needs to be in hexadecimal form, but spaces or upper/lower

	    case are not significant.

	  </para>

	</listitem>

      </varlistentry>

      <varlistentry>

	<term><option><literal>host = </literal><replaceable

	>STRING</replaceable></option></term>

	<listitem>

	  <para>

	    This option is <emphasis>optional</emphasis>, but highly

	    <emphasis>recommended</emphasis> unless the

	    <option>checker</option> option is modified to a

	    non-standard value without <quote>%%(host)s</quote> in it.

	  </para>

	  <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>

      <varlistentry>

	<term><option>interval<literal> = </literal><replaceable

	>TIME</replaceable></option></term>

	<listitem>

	  <para>

	    This option is <emphasis>optional</emphasis>.

	  </para>

	  <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 below

	    <quote><varname>timeout</varname></quote> occurs, at which

	    time the client will be disabled, and any running checker

	    killed.  The default interval is 2 minutes.

	  </para>

	  <para>

	    The format of <replaceable>TIME</replaceable> is the same

	    as for <varname>timeout</varname> below.

	  </para>

	</listitem>

      </varlistentry>

      <varlistentry>

	<term><option>secfile<literal> = </literal><replaceable

	>FILENAME</replaceable></option></term>

	<listitem>

	  <para>

	    This option is only used if <option>secret</option> is not

	    specified, in which case this option is

	    <emphasis>required</emphasis>.

	  </para>

	  <para>

	    Similar to the <option>secret</option>, except 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>

	    File names of the form <filename>~user/foo/bar</filename>

	    and <filename>$<envar>ENVVAR</envar>/foo/bar</filename>

	    are supported.

	  </para>

	</listitem>

      </varlistentry>

      <varlistentry>

	<term><option>secret<literal> = </literal><replaceable

	>BASE64_ENCODED_DATA</replaceable></option></term>

	<listitem>

	  <para>

	    If this option is not specified, the <option

	    >secfile</option> option is <emphasis>required</emphasis>

	    to be present.

	  </para>

	  <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>key_id</option>

	    or <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>

	</listitem>

      </varlistentry>

      <varlistentry>

	<term><option>timeout<literal> = </literal><replaceable

	>TIME</replaceable></option></term>

	<listitem>

	  <para>

	    This option is <emphasis>optional</emphasis>.

	  </para>

	  <para>

	    The timeout is how long the server will wait, after a

	    successful checker run, until a client is disabled and not

	    allowed to get the data this server holds.  By default

	    Mandos will use 5 minutes.  See also the

	    <option>extended_timeout</option> option.

	  </para>

	  <para>

	    The <replaceable>TIME</replaceable> is specified as an RFC

	    3339 duration; for example

	    <quote><literal>P1Y2M3DT4H5M6S</literal></quote> meaning

	    one year, two months, three days, four hours, five

	    minutes, and six seconds.  Some values can be omitted, see

	    RFC 3339 Appendix A for details.

	  </para>

	</listitem>

      </varlistentry>

      <varlistentry>

	<term><option>enabled<literal> = </literal>{ <literal

	>1</literal> | <literal>yes</literal> |	<literal>true</literal

	> | <literal >on</literal> | <literal>0</literal> | <literal

	>no</literal> | <literal>false</literal> | <literal

	>off</literal> }</option></term>

	<listitem>

	  <para>

	    Whether this client should be enabled by default.  The

	    default is <quote>true</quote>.

	  </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 in the

	Mandos server.  The currently allowed values for

	<replaceable>foo</replaceable> are:

	<quote><literal>approval_delay</literal></quote>,

	<quote><literal>approval_duration</literal></quote>,

	<quote><literal>created</literal></quote>,

	<quote><literal>enabled</literal></quote>,

	<quote><literal>expires</literal></quote>,

	<quote><literal>key_id</literal></quote>,

	<quote><literal>fingerprint</literal></quote>,

	<quote><literal>host</literal></quote>,

	<quote><literal>interval</literal></quote>,

	<quote><literal>last_approval_request</literal></quote>,

	<quote><literal>last_checked_ok</literal></quote>,

	<quote><literal>last_enabled</literal></quote>,

	<quote><literal>name</literal></quote>,

	<quote><literal>timeout</literal></quote>, and, if using

	D-Bus, <quote><literal>dbus_object_path</literal></quote>.

	See the source code for details.  <emphasis role="strong"

	>Currently, <emphasis>none</emphasis> of these attributes

	except <quote><literal>host</literal></quote> are guaranteed

	to be valid in future versions.</emphasis> Therefore, please

	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 expose 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>

    <xi:include href="bugs.xml"/>

  </refsect1>

  <refsect1 id="example">

    <title>EXAMPLE</title>

    <informalexample>

      <programlisting>

[DEFAULT]

timeout = PT5M

interval = PT2M

checker = fping -q -- %%(host)s

# Client "foo"

[foo]

key_id = 788cd77115cd0bb7b2d5e0ae8496f6b48149d5e712c652076b1fd2d957ef7c1f

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 = PT1M

# Client "bar"

[bar]

key_id = F90C7A81D72D1EA69A51031A91FF8885F36C8B46D155C8C58709A4C99AE9E361

fingerprint = 3e393aeaefb84c7e89e2f547b3a107558fca3a27

secfile = /etc/mandos/bar-secret

timeout = PT15M

approved_by_default = False

approval_delay = PT30S

      </programlisting>

    </informalexample>

  </refsect1>

  <refsect1 id="see_also">

    <title>SEE ALSO</title>

    <para>

      <citerefentry><refentrytitle>intro</refentrytitle>

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

      <citerefentry><refentrytitle>mandos-keygen</refentrytitle>

      <manvolnum>8</manvolnum></citerefentry>,

      <citerefentry><refentrytitle>mandos.conf</refentrytitle>

      <manvolnum>5</manvolnum></citerefentry>,

      <citerefentry><refentrytitle>mandos</refentrytitle>

      <manvolnum>8</manvolnum></citerefentry>,

      <citerefentry><refentrytitle>fping</refentrytitle>

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

    </para>

    <variablelist>

      <varlistentry>

	<term>

	  RFC 3339: <citetitle>Date and Time on the Internet:

	  Timestamps</citetitle>

	</term>

      <listitem>

	<para>

	  The time intervals are in the "duration" format, as

	  specified in ABNF in Appendix A of RFC 3339.

	</para>

      </listitem>

      </varlistentry>

    </variablelist>

  </refsect1>

</refentry>

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