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  • Committer: Teddy Hogeborn
  • Date: 2015-07-01 20:01:26 UTC
  • mto: This revision was merged to the branch mainline in revision 759.
  • Revision ID: teddy@recompile.se-20150701200126-qb3f6c3jcas2f4og
mandos-client: Try to start a plugin to add and remove a local route.

* debian/mandos-client.README.Debian: Add setting of environment
                                      variable MANDOSPLUGINHELPERDIR
                                      to command line testing
                                      mandos-client.
* mandos-client.c (raise_privileges): Moved to top of file.
                  (raise_privileges_permanently): - '' -
                  (lower_privileges): - '' -
                  (lower_privileges_permanently): - '' -
  (add_remove_local_route, add_local_route, remove_local_route): New.
  (start_mandos_communication): Set SOCK_CLOEXEC flag on socket.  Run
                                the above functions to add (and
                                remove) local route, if the conditions
                                indicates it could help.
  (run_network_hooks): Use O_DIRECTORY, O_PATH, and O_CLOEXEC flags
                       when opening network hook directory. Do
                       TEMP_FAILURE_RETRY around opening of /dev/null
                       and network hook executables.  Move redirecting
                       of stdout and stderr to as late as possible
                       before fexecve().
  (main): Use O_DIRECTORY and O_PATH when opening temporary directory.
* plugins.d/mandos-client.xml (ENVIRONMENT): Document usage of the
                                             MANDOSPLUGINHELPERDIR
                                             environment variable.

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plugins.d/mandos-client.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-client">
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<!ENTITY TIMESTAMP "2013-10-20">
 
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<!ENTITY TIMESTAMP "2015-06-29">
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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>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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            assumed to separate the address from the port number.
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          </para>
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          <para>
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            This option is normally only useful for testing and
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            debugging.
 
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            Normally, Zeroconf would be used to locate Mandos servers,
 
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            in which case this option would only be used when testing
 
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            and debugging.
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          </para>
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        </listitem>
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      </varlistentry>
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          <para>
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            <replaceable>NAME</replaceable> can be the string
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            <quote><literal>none</literal></quote>; this will make
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            <command>&COMMANDNAME;</command> not bring up
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            <emphasis>any</emphasis> interfaces specified
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            <emphasis>after</emphasis> this string.  This is not
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            recommended, and only meant for advanced users.
 
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            <command>&COMMANDNAME;</command> only bring up interfaces
 
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            specified <emphasis>before</emphasis> this string.  This
 
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            is not recommended, and only meant for advanced users.
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          </para>
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        </listitem>
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      </varlistentry>
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  <refsect1 id="environment">
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    <title>ENVIRONMENT</title>
 
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    <variablelist>
 
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      <varlistentry>
 
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        <term><envar>MANDOSPLUGINHELPERDIR</envar></term>
 
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        <listitem>
 
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          <para>
 
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            This environment variable will be assumed to contain the
 
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            directory containing any helper executables.  The use and
 
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            nature of these helper executables, if any, is
 
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            purposefully not documented.
 
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        </para>
 
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        </listitem>
 
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      </varlistentry>
 
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    </variablelist>
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    <para>
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      This program does not use any environment variables, not even
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      the ones provided by <citerefentry><refentrytitle
 
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      This program does not use any other environment variables, not
 
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      even the ones provided by <citerefentry><refentrytitle
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      >cryptsetup</refentrytitle><manvolnum>8</manvolnum>
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    </citerefentry>.
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    </para>
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    <para>
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      It will also help if the checker program on the server is
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      configured to request something from the client which can not be
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      spoofed by someone else on the network, unlike unencrypted
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      <acronym>ICMP</acronym> echo (<quote>ping</quote>) replies.
 
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      spoofed by someone else on the network, like SSH server key
 
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      fingerprints, and unlike unencrypted <acronym>ICMP</acronym>
 
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      echo (<quote>ping</quote>) replies.
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    </para>
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    <para>
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      <emphasis>Note</emphasis>: This makes it completely insecure to