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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-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 "2018-02-08">
 
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<!ENTITY TIMESTAMP "2013-10-15">
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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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      <year>2014</year>
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      <year>2015</year>
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      <year>2016</year>
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      <year>2017</year>
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      <year>2018</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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            <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>.  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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            >--</option> %%(host)s</literal></quote>.
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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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          <para>
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            This option sets the OpenPGP fingerprint that identifies
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            the public key that clients authenticate themselves with
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            through TLS.  The string needs to be in hexadecimal form,
 
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            through TLS.  The string needs to be in hexidecimal form,
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            but spaces or upper/lower case are not significant.
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          </para>
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        </listitem>
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      <literal>%(<replaceable>foo</replaceable>)s</literal> is
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      obscure.
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    </para>
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    <xi:include href="bugs.xml"/>
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  </refsect1>
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  <refsect1 id="example">