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  • Committer: Teddy Hogeborn
  • Date: 2014-06-08 03:10:08 UTC
  • mto: (237.7.272 trunk)
  • mto: This revision was merged to the branch mainline in revision 317.
  • Revision ID: teddy@recompile.se-20140608031008-mc9bd7b024a3q0y0
Address a very theoretical possible security issue in mandos-client.

If there were to run some sort of "cleaner" process for /run/tmp (or
/tmp), and mandos-client were to run for long enough for that cleaner
process to remove the temporary directory for GPGME, there was a
possibility that another unprivileged process could trick the (also
unprivileged) mandos-client process to remove other files or symlinks
which the unprivileged mandos-client process was allowed to remove.
This is not currently known to have been exploitable, since there are
no known initramfs environments running such cleaner processes.

* plugins.d/mandos-client.c (main): Use O_NOFOLLOW when opening
                                    tempdir for cleaning.

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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 "2012-01-01">
 
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<!ENTITY TIMESTAMP "2013-10-26">
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<!ENTITY % common SYSTEM "common.ent">
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%common;
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]>
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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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      <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>--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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    </cmdsynopsis>
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    <cmdsynopsis>
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      <command>&COMMANDNAME;</command>
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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="priority"/>
 
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          <xi:include href="mandos-options.xml"
 
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                      xpointer="priority_compat"/>
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        </listitem>
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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>
 
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            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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          <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>
 
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        <listitem>
 
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          <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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    </variablelist>
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  </refsect1>
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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>.  A client successfully
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      receiving its password will also be treated as a successful
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      checker run.
 
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      <manvolnum>5</manvolnum></citerefentry>.
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    </para>
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  </refsect1>
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    </para>
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  </refsect1>
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  <refsect1 id="persistent_state">
 
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    <title>PERSISTENT STATE</title>
 
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    <para>
 
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      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>
 
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  </refsect1>
 
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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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            <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>
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        </listitem>
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      </varlistentry>
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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>
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      Debug mode is conflated with running in the foreground.
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    </para>
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    <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>