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  • Committer: Teddy Hogeborn
  • Date: 2014-06-22 02:19:30 UTC
  • Revision ID: teddy@recompile.se-20140622021930-icl7h4cm97blhjml
mandos-keygen: Generate "checker" option to use SSH fingerprints.

To turn this off, use a new "--no-ssh" option to mandos-keygen.

* INSTALL (Mandos Server, Mandos Client): Document new suggested
                                          installation of SSH.
* Makefile (confdir/clients.conf): Use new "--no-ssh" option to
                                   "mandos-keygen".
* debian/control (mandos/Depends): Changed to "fping | ssh-client".
  (mandos-client/Recommends): New; set to "ssh".
* intro.xml (FREQUENTLY ASKED QUESTIONS): Rename and rewrite section
                                          called "Faking ping
                                          replies?" to address new
                                          default behavior.
* mandos-clients.conf.xml (OPTIONS/checker): Briefly discuss new
                                             behavior of
                                             mandos-keygen.
* mandos-keygen: Bug fix: Suppress failure output of "shred" to remove
                 "sec*", since no such files may exist.
 (password mode): Scan for SSH key fingerprints and output as new
                  "checker" and "ssh_fingerprint" options, unless new
                  "--no-ssh" option is given.
* mandos-keygen.xml (SYNOPSIS/--force): Bug fix: Document short form.
  (OPTIONS/--no-ssh): New.
  (SEE ALSO): Add reference "ssh-keyscan(1)".
* plugins.d/mandos-client.xml (SECURITY): Briefly mention the
                                          possibility of using SSH key
                                          fingerprints for checking.

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mandos-clients.conf.xml
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        "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
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<!ENTITY CONFNAME "mandos-clients.conf">
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<!ENTITY CONFPATH "<filename>/etc/mandos/clients.conf</filename>">
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<!ENTITY TIMESTAMP "2011-10-10">
 
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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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      <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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      <holder>Teddy Hogeborn</holder>
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      <holder>Björn Påhlsson</holder>
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    </copyright>
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      ><refentrytitle>mandos</refentrytitle>
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      <manvolnum>8</manvolnum></citerefentry>, read by it at startup.
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      The file needs to list all clients that should be able to use
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      the service.  All clients listed will be regarded as enabled,
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      even if a client was disabled in a previous run of the server.
 
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      the service.  The settings in this file can be overridden by
 
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      runtime changes to the server, which it saves across restarts.
 
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      (See the section called <quote>PERSISTENT STATE</quote> in
 
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      <citerefentry><refentrytitle>mandos</refentrytitle><manvolnum
 
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      >8</manvolnum></citerefentry>.)  However, any <emphasis
 
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      >changes</emphasis> to this file (including adding and removing
 
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      clients) will, at startup, override changes done during runtime.
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    </para>
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    <para>
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      The format starts with a <literal>[<replaceable>section
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          <para>
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            How long to wait for external approval before resorting to
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            use the <option>approved_by_default</option> value.  The
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            default is <quote>0s</quote>, i.e. not to wait.
 
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            default is <quote>PT0S</quote>, i.e. not to wait.
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          </para>
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          <para>
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            The format of <replaceable>TIME</replaceable> is the same
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            This option is <emphasis>optional</emphasis>.
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          </para>
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          <para>
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            This option allows you to override the default shell
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            command that the server will use to check if the client is
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            still up.  Any output of the command will be ignored, only
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            the exit code is checked:  If the exit code of the command
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            is zero, the client is considered up.  The command will be
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            run using <quote><command><filename>/bin/sh</filename>
 
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            This option overrides the default shell command that the
 
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            server will use to check if the client is still up.  Any
 
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            output of the command will be ignored, only the exit code
 
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            is checked:  If the exit code of the command is zero, the
 
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            client is considered up.  The command will be run using
 
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            <quote><command><filename>/bin/sh</filename>
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            <option>-c</option></command></quote>, so
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            <varname>PATH</varname> will be searched.  The default
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            value for the checker command is <quote><literal
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            ><command>fping</command> <option>-q</option> <option
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            >--</option> %%(host)s</literal></quote>.
 
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            >--</option> %%(host)s</literal></quote>.  Note that
 
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            <command>mandos-keygen</command>, when generating output
 
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            to be inserted into this file, normally looks for an SSH
 
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            server on the Mandos client, and, if it find one, outputs
 
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            a <option>checker</option> option to check for the
 
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            client’s key fingerprint – this is more secure against
 
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            spoofing.
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          </para>
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          <para>
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            In addition to normal start time expansion, this option
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            <option>extended_timeout</option> option.
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          </para>
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          <para>
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            The <replaceable>TIME</replaceable> is specified as a
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            space-separated number of values, each of which is a
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            number and a one-character suffix.  The suffix must be one
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            of <quote>d</quote>, <quote>s</quote>, <quote>m</quote>,
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            <quote>h</quote>, and <quote>w</quote> for days, seconds,
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            minutes, hours, and weeks, respectively.  The values are
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            added together to give the total time value, so all of
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            <quote><literal>330s</literal></quote>,
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            <quote><literal>110s 110s 110s</literal></quote>, and
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            <quote><literal>5m 30s</literal></quote> will give a value
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            of five minutes and thirty seconds.
 
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            The <replaceable>TIME</replaceable> is specified as an RFC
 
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            3339 duration; for example
 
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            <quote><literal>P1Y2M3DT4H5M6S</literal></quote> meaning
 
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            one year, two months, three days, four hours, five
 
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            minutes, and six seconds.  Some values can be omitted, see
 
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            RFC 3339 Appendix A for details.
 
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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>enabled<literal> = </literal>{ <literal
 
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        >1</literal> | <literal>yes</literal> | <literal>true</literal
 
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        > | <literal >on</literal> | <literal>0</literal> | <literal
 
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        >no</literal> | <literal>false</literal> | <literal
 
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        >off</literal> }</option></term>
 
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        <listitem>
 
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          <para>
 
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            Whether this client should be enabled by default.  The
 
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            default is <quote>true</quote>.
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          </para>
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        </listitem>
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      </varlistentry>
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        <quote><literal>approval_duration</literal></quote>,
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        <quote><literal>created</literal></quote>,
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        <quote><literal>enabled</literal></quote>,
 
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        <quote><literal>expires</literal></quote>,
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        <quote><literal>fingerprint</literal></quote>,
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        <quote><literal>host</literal></quote>,
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        <quote><literal>interval</literal></quote>,
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    <informalexample>
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      <programlisting>
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[DEFAULT]
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timeout = 5m
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interval = 2m
 
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timeout = PT5M
 
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interval = PT2M
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checker = fping -q -- %%(host)s
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# Client "foo"
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        4T2zw4dxS5NswXWU0sVEXxjs6PYxuIiCTL7vdpx8QjBkrPWDrAbcMyBr2O
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        QlnHIvPzEArRQLo=
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host = foo.example.org
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interval = 1m
 
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interval = PT1M
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# Client "bar"
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[bar]
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fingerprint = 3e393aeaefb84c7e89e2f547b3a107558fca3a27
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secfile = /etc/mandos/bar-secret
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timeout = 15m
 
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timeout = PT15M
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approved_by_default = False
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approval_delay = 30s
 
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approval_delay = PT30S
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      </programlisting>
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    </informalexample>
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  </refsect1>
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      <citerefentry><refentrytitle>mandos.conf</refentrytitle>
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      <manvolnum>5</manvolnum></citerefentry>,
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      <citerefentry><refentrytitle>mandos</refentrytitle>
 
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      <manvolnum>8</manvolnum></citerefentry>,
 
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      <citerefentry><refentrytitle>fping</refentrytitle>
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      <manvolnum>8</manvolnum></citerefentry>
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    </para>
 
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    <variablelist>
 
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      <varlistentry>
 
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        <term>
 
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          RFC 3339: <citetitle>Date and Time on the Internet:
 
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          Timestamps</citetitle>
 
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        </term>
 
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      <listitem>
 
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        <para>
 
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          The time intervals are in the "duration" format, as
 
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          specified in ABNF in Appendix A of RFC 3339.
 
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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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</refentry>
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