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  • Committer: Teddy Hogeborn
  • Date: 2016-02-21 12:55:39 UTC
  • mto: (237.7.594 trunk)
  • mto: This revision was merged to the branch mainline in revision 331.
  • Revision ID: teddy@recompile.se-20160221125539-wi1n8ci0ldbdxrar
plugins.d/mandos-client.c (get_flags): Use strncpy(), not strcpy().

* plugins.d/mandos-client.c (get_flags): Use strncpy() instead of
  strcpy().  Note that as the code works currently, this is never a
  problem in practice, since only interface names which were valid
  existing interface names (and therefore had names with lengths below
  IF_NAMESIZE) is ever passed to the get_flags() function.  But it
  doesn't hurt to check, anyway.

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mandos.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">
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<!ENTITY TIMESTAMP "2010-09-26">
 
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<!ENTITY TIMESTAMP "2015-12-06">
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<!ENTITY % common SYSTEM "common.ent">
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%common;
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]>
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        <firstname>Björn</firstname>
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        <surname>Påhlsson</surname>
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        <address>
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          <email>belorn@fukt.bsnet.se</email>
 
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          <email>belorn@recompile.se</email>
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        </address>
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      </author>
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      <author>
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        <firstname>Teddy</firstname>
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        <surname>Hogeborn</surname>
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        <address>
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          <email>teddy@fukt.bsnet.se</email>
 
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          <email>teddy@recompile.se</email>
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        </address>
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      </author>
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    </authorgroup>
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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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      <holder>Teddy Hogeborn</holder>
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      <holder>Björn Påhlsson</holder>
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    </copyright>
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      <sbr/>
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      <arg><option>--debug</option></arg>
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      <sbr/>
 
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      <arg><option>--debuglevel
 
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      <replaceable>LEVEL</replaceable></option></arg>
 
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      <sbr/>
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      <arg><option>--no-dbus</option></arg>
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      <sbr/>
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      <arg><option>--no-ipv6</option></arg>
 
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      <sbr/>
 
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      <arg><option>--no-restore</option></arg>
 
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      <sbr/>
 
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      <arg><option>--statedir
 
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      <replaceable>DIRECTORY</replaceable></option></arg>
 
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      <sbr/>
 
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      <arg><option>--socket
 
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      <replaceable>FD</replaceable></option></arg>
 
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      <sbr/>
 
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      <arg><option>--foreground</option></arg>
 
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      <sbr/>
 
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      <arg><option>--no-zeroconf</option></arg>
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    </cmdsynopsis>
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    <cmdsynopsis>
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      <command>&COMMANDNAME;</command>
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    <para>
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      <command>&COMMANDNAME;</command> is a server daemon which
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      handles incoming request for passwords for a pre-defined list of
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      client host computers.  The Mandos server uses Zeroconf to
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      announce itself on the local network, and uses TLS to
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      communicate securely with and to authenticate the clients.  The
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      Mandos server uses IPv6 to allow Mandos clients to use IPv6
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      link-local addresses, since the clients will probably not have
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      any other addresses configured (see <xref linkend="overview"/>).
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      Any authenticated client is then given the stored pre-encrypted
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      password for that specific client.
 
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      client host computers. For an introduction, see
 
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      <citerefentry><refentrytitle>intro</refentrytitle>
 
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      <manvolnum>8mandos</manvolnum></citerefentry>. The Mandos server
 
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      uses Zeroconf to announce itself on the local network, and uses
 
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      TLS to communicate securely with and to authenticate the
 
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      clients.  The Mandos server uses IPv6 to allow Mandos clients to
 
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      use IPv6 link-local addresses, since the clients will probably
 
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      not have any other addresses configured (see <xref
 
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      linkend="overview"/>).  Any authenticated client is then given
 
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      the stored pre-encrypted password for that specific client.
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    </para>
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  </refsect1>
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      </varlistentry>
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      <varlistentry>
 
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        <term><option>--debuglevel
 
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        <replaceable>LEVEL</replaceable></option></term>
 
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        <listitem>
 
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          <para>
 
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            Set the debugging log level.
 
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            <replaceable>LEVEL</replaceable> is a string, one of
 
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            <quote><literal>CRITICAL</literal></quote>,
 
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            <quote><literal>ERROR</literal></quote>,
 
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            <quote><literal>WARNING</literal></quote>,
 
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            <quote><literal>INFO</literal></quote>, or
 
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            <quote><literal>DEBUG</literal></quote>, in order of
 
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            increasing verbosity.  The default level is
 
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            <quote><literal>WARNING</literal></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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        PRIORITY</replaceable></option></term>
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        <listitem>
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          <xi:include href="mandos-options.xml" xpointer="ipv6"/>
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        </listitem>
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      </varlistentry>
 
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      <varlistentry>
 
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        <term><option>--no-restore</option></term>
 
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        <listitem>
 
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          <xi:include href="mandos-options.xml" xpointer="restore"/>
 
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          <para>
 
300
            See also <xref linkend="persistent_state"/>.
 
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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>--statedir
 
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        <replaceable>DIRECTORY</replaceable></option></term>
 
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        <listitem>
 
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          <xi:include href="mandos-options.xml" xpointer="statedir"/>
 
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        </listitem>
 
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      </varlistentry>
 
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      <varlistentry>
 
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        <term><option>--socket
 
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        <replaceable>FD</replaceable></option></term>
 
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        <listitem>
 
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          <xi:include href="mandos-options.xml" xpointer="socket"/>
 
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        </listitem>
 
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      </varlistentry>
 
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      <varlistentry>
 
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        <term><option>--foreground</option></term>
 
323
        <listitem>
 
324
          <xi:include href="mandos-options.xml"
 
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                      xpointer="foreground"/>
 
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        </listitem>
 
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      </varlistentry>
 
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      <varlistentry>
 
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        <term><option>--no-zeroconf</option></term>
 
331
        <listitem>
 
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          <xi:include href="mandos-options.xml" xpointer="zeroconf"/>
 
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        </listitem>
 
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      </varlistentry>
 
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    </variablelist>
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  </refsect1>
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330
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      for some time, the client is assumed to be compromised and is no
331
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      longer eligible to receive the encrypted password.  (Manual
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      intervention is required to re-enable a client.)  The timeout,
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      checker program, and interval between checks can be configured
334
 
      both globally and per client; see <citerefentry>
335
 
      <refentrytitle>mandos-clients.conf</refentrytitle>
336
 
      <manvolnum>5</manvolnum></citerefentry>.  A client successfully
337
 
      receiving its password will also be treated as a successful
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      checker run.
 
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      extended timeout, checker program, and interval between checks
 
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      can be configured both globally and per client; see
 
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      <citerefentry><refentrytitle>mandos-clients.conf</refentrytitle>
 
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      <manvolnum>5</manvolnum></citerefentry>.
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    </para>
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  </refsect1>
341
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    <title>LOGGING</title>
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    <para>
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      The server will send log message with various severity levels to
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      <filename>/dev/log</filename>.  With the
 
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      <filename class="devicefile">/dev/log</filename>.  With the
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      <option>--debug</option> option, it will log even more messages,
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      and also show them on the console.
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    </para>
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  </refsect1>
371
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452
  <refsect1 id="persistent_state">
 
453
    <title>PERSISTENT STATE</title>
 
454
    <para>
 
455
      Client settings, initially read from
 
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      <filename>clients.conf</filename>, are persistent across
 
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      restarts, and run-time changes will override settings in
 
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      <filename>clients.conf</filename>.  However, if a setting is
 
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      <emphasis>changed</emphasis> (or a client added, or removed) in
 
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      <filename>clients.conf</filename>, this will take precedence.
 
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    </para>
 
462
  </refsect1>
 
463
  
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  <refsect1 id="dbus_interface">
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    <title>D-BUS INTERFACE</title>
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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>/var/run/mandos.pid</filename></term>
 
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        <term><filename>/run/mandos.pid</filename></term>
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        <listitem>
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          <para>
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            The file containing the process id of the
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            <command>&COMMANDNAME;</command> process started last.
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          </para>
445
 
        </listitem>
446
 
      </varlistentry>
447
 
      <varlistentry>
448
 
        <term><filename>/dev/log</filename></term>
 
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            <emphasis >Note:</emphasis> If the <filename
 
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            class="directory">/run</filename> directory does not
 
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            exist, <filename>/var/run/mandos.pid</filename> will be
 
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            used instead.
 
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          </para>
 
541
        </listitem>
 
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      </varlistentry>
 
543
      <varlistentry>
 
544
        <term><filename
 
545
        class="directory">/var/lib/mandos</filename></term>
 
546
        <listitem>
 
547
          <para>
 
548
            Directory where persistent state will be saved.  Change
 
549
            this with the <option>--statedir</option> option.  See
 
550
            also the <option>--no-restore</option> option.
 
551
          </para>
 
552
        </listitem>
 
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      </varlistentry>
 
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      <varlistentry>
 
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        <term><filename class="devicefile">/dev/log</filename></term>
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        <listitem>
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          <para>
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            The Unix domain socket to where local syslog messages are
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      backtrace.  This could be considered a feature.
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    </para>
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    <para>
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      Currently, if a client is disabled due to having timed out, the
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      server does not record this fact onto permanent storage.  This
479
 
      has some security implications, see <xref linkend="clients"/>.
480
 
    </para>
481
 
    <para>
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      There is no fine-grained control over logging and debug output.
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    </para>
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    <para>
485
 
      Debug mode is conflated with running in the foreground.
486
 
    </para>
487
 
    <para>
488
 
      The console log messages do not show a time stamp.
489
 
    </para>
490
 
    <para>
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      This server does not check the expire time of clients’ OpenPGP
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      keys.
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    </para>
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    <informalexample>
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      <para>
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        Run the server in debug mode, read configuration files from
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        the <filename>~/mandos</filename> directory, and use the
510
 
        Zeroconf service name <quote>Test</quote> to not collide with
511
 
        any other official Mandos server on this host:
 
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        the <filename class="directory">~/mandos</filename> directory,
 
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        and use the Zeroconf service name <quote>Test</quote> to not
 
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        collide with any other official Mandos server on this host:
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      </para>
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      <para>
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        compromised if they are gone for too long.
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      </para>
565
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      <para>
566
 
        If a client is compromised, its downtime should be duly noted
567
 
        by the server which would therefore disable the client.  But
568
 
        if the server was ever restarted, it would re-read its client
569
 
        list from its configuration file and again regard all clients
570
 
        therein as enabled, and hence eligible to receive their
571
 
        passwords.  Therefore, be careful when restarting servers if
572
 
        it is suspected that a client has, in fact, been compromised
573
 
        by parties who may now be running a fake Mandos client with
574
 
        the keys from the non-encrypted initial <acronym>RAM</acronym>
575
 
        image of the client host.  What should be done in that case
576
 
        (if restarting the server program really is necessary) is to
577
 
        stop the server program, edit the configuration file to omit
578
 
        any suspect clients, and restart the server program.
579
 
      </para>
580
 
      <para>
581
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        For more details on client-side security, see
582
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        <citerefentry><refentrytitle>mandos-client</refentrytitle>
583
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        <manvolnum>8mandos</manvolnum></citerefentry>.
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  <refsect1 id="see_also">
589
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    <title>SEE ALSO</title>
590
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    <para>
591
 
      <citerefentry>
592
 
        <refentrytitle>mandos-clients.conf</refentrytitle>
593
 
        <manvolnum>5</manvolnum></citerefentry>, <citerefentry>
594
 
        <refentrytitle>mandos.conf</refentrytitle>
595
 
        <manvolnum>5</manvolnum></citerefentry>, <citerefentry>
596
 
        <refentrytitle>mandos-client</refentrytitle>
597
 
        <manvolnum>8mandos</manvolnum></citerefentry>, <citerefentry>
598
 
        <refentrytitle>sh</refentrytitle><manvolnum>1</manvolnum>
599
 
      </citerefentry>
 
672
      <citerefentry><refentrytitle>intro</refentrytitle>
 
673
      <manvolnum>8mandos</manvolnum></citerefentry>,
 
674
      <citerefentry><refentrytitle>mandos-clients.conf</refentrytitle>
 
675
      <manvolnum>5</manvolnum></citerefentry>,
 
676
      <citerefentry><refentrytitle>mandos.conf</refentrytitle>
 
677
      <manvolnum>5</manvolnum></citerefentry>,
 
678
      <citerefentry><refentrytitle>mandos-client</refentrytitle>
 
679
      <manvolnum>8mandos</manvolnum></citerefentry>,
 
680
      <citerefentry><refentrytitle>sh</refentrytitle>
 
681
      <manvolnum>1</manvolnum></citerefentry>
600
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    </para>
601
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    <variablelist>
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      <varlistentry>
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      </varlistentry>
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      <varlistentry>
625
707
        <term>
626
 
          <ulink url="http://www.gnu.org/software/gnutls/"
627
 
          >GnuTLS</ulink>
 
708
          <ulink url="http://gnutls.org/">GnuTLS</ulink>
628
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        </term>
629
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      <listitem>
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        <para>
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      </varlistentry>
669
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      <varlistentry>
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        <term>
671
 
          RFC 4346: <citetitle>The Transport Layer Security (TLS)
672
 
          Protocol Version 1.1</citetitle>
 
752
          RFC 5246: <citetitle>The Transport Layer Security (TLS)
 
753
          Protocol Version 1.2</citetitle>
673
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        </term>
674
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      <listitem>
675
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        <para>
676
 
          TLS 1.1 is the protocol implemented by GnuTLS.
 
757
          TLS 1.2 is the protocol implemented by GnuTLS.
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        </para>
678
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      </listitem>
679
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      </varlistentry>
689
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      </varlistentry>
690
771
      <varlistentry>
691
772
        <term>
692
 
          RFC 5081: <citetitle>Using OpenPGP Keys for Transport Layer
693
 
          Security</citetitle>
 
773
          RFC 6091: <citetitle>Using OpenPGP Keys for Transport Layer
 
774
          Security (TLS) Authentication</citetitle>
694
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        </term>
695
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      <listitem>
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        <para>