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  • Committer: Teddy Hogeborn
  • Date: 2014-06-08 03:10:08 UTC
  • 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 "2012-05-27">
 
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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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          <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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            <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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    <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>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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