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  • Committer: teddy at recompile
  • Date: 2011-12-27 03:56:39 UTC
  • mto: This revision was merged to the branch mainline in revision 541.
  • Revision ID: teddy@recompile.se-20111227035639-hvvgrqchckawlg02
Add wireless network hook

* network-hooks.s/bridge: Use canonical syntax for "ip" command.
* network-hooks.s/wireless: New.
* network-hooks.s/wireless.conf: - '' -
* plugins.d/mandos-client.c (run_network_hooks): Add new "CONNECT"
                                                 environment variable.
* plugins.d/mandos-client.xml (NETWORK HOOKS/REQUIREMENTS): Document
                                                            "CONNECT"
                                                            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 "2010-09-26">
 
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<!ENTITY TIMESTAMP "2011-11-27">
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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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    <copyright>
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      <year>2008</year>
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      <year>2009</year>
 
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      <year>2011</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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      </arg>
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      <sbr/>
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      <arg>
 
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        <option>--network-hook-dir
 
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        <replaceable>DIR</replaceable></option>
 
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      </arg>
 
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      <sbr/>
 
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      <arg>
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        <option>--debug</option>
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      </arg>
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    </cmdsynopsis>
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      using TLS with an OpenPGP key to ensure authenticity and
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      confidentiality.  This client program keeps running, trying all
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      servers on the network, until it receives a satisfactory reply
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      or a TERM signal is received.  If no servers are found, or after
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      all servers have been tried, it waits indefinitely for new
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      servers to appear.
 
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      or a TERM signal.  After all servers have been tried, all
 
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      servers are periodically retried.  If no servers are found it
 
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      will wait indefinitely for new servers to appear.
 
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    </para>
 
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    <para>
 
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      The network interface is selected like this: If an interface is
 
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      specified using the <option>--interface</option> option, that
 
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      interface is used.  Otherwise, <command>&COMMANDNAME;</command>
 
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      will choose any interface that is up and running and is not a
 
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      loopback interface, is not a point-to-point interface, is
 
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      capable of broadcasting and does not have the NOARP flag (see
 
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      <citerefentry><refentrytitle>netdevice</refentrytitle>
 
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      <manvolnum>7</manvolnum></citerefentry>).  (If the
 
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      <option>--connect</option> option is used, point-to-point
 
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      interfaces and non-broadcast interfaces are accepted.)  If no
 
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      acceptable interfaces are found, re-run the check but without
 
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      the <quote>up and running</quote> requirement, and manually take
 
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      the selected interface up (and later take it down on program
 
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      exit).
 
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    </para>
 
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    <para>
 
167
      Before a network interface is selected, all <quote>network
 
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      hooks</quote> are run; see <xref linkend="network-hooks"/>.
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    </para>
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    <para>
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      This program is not meant to be run directly; it is really meant
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            can not be a pseudo-interface such as <quote>br0</quote>
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            or <quote>tun0</quote>; such interfaces will not exist
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            until much later in the boot process, and can not be used
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            by this program.
 
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            by this program, unless created by a <quote>network
 
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            hook</quote> — see <xref linkend="network-hooks"/>.
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          </para>
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          <para>
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            <replaceable>NAME</replaceable> can be the string
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        >SECONDS</replaceable></option></term>
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        <listitem>
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          <para>
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            All Mandos servers servers are tried repeatedly until a
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            password is received.  This value specifies, in seconds,
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            how long between each successive try <emphasis>for the
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            same server</emphasis>.  The default is 10 seconds.
 
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            All Mandos servers are tried repeatedly until a password
 
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            is received.  This value specifies, in seconds, how long
 
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            between each successive try <emphasis>for the same
 
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            server</emphasis>.  The default is 10 seconds.
 
337
          </para>
 
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        </listitem>
 
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      </varlistentry>
 
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      <varlistentry>
 
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        <term><option>--network-hook-dir=<replaceable
 
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        >DIR</replaceable></option></term>
 
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        <listitem>
 
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          <para>
 
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            Network hook directory.  The default directory is
 
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            <quote><filename class="directory"
 
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            >/lib/mandos/network-hooks.d</filename></quote>.
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          </para>
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        </listitem>
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      </varlistentry>
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      <refentrytitle>plugin-runner</refentrytitle>
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      <manvolnum>8mandos</manvolnum></citerefentry>) is used to run
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      both this program and others in in parallel,
379
 
      <emphasis>one</emphasis> of which will prompt for passwords on
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      the system console.
 
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      <emphasis>one</emphasis> of which (<citerefentry>
 
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      <refentrytitle>password-prompt</refentrytitle>
 
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      <manvolnum>8mandos</manvolnum></citerefentry>) will prompt for
 
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      passwords on the system console.
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    </para>
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  </refsect1>
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      server could be found and the password received from it could be
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      successfully decrypted and output on standard output.  The
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      program will exit with a non-zero exit status only if a critical
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      error occurs.  Otherwise, it will forever connect to new
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      <application>Mandos</application> servers as they appear, trying
393
 
      to get a decryptable password and print it.
 
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      error occurs.  Otherwise, it will forever connect to any
 
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      discovered <application>Mandos</application> servers, trying to
 
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      get a decryptable password and print it.
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    </para>
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  </refsect1>
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    </para>
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  </refsect1>
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448
  <refsect1 id="network-hooks">
 
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    <title>NETWORK HOOKS</title>
 
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    <para>
 
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      If a network interface like a bridge or tunnel is required to
 
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      find a Mandos server, this requires the interface to be up and
 
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      running before <command>&COMMANDNAME;</command> starts looking
 
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      for Mandos servers.  This can be accomplished by creating a
 
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      <quote>network hook</quote> program, and placing it in a special
 
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      directory.
 
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    </para>
 
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    <para>
 
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      Before the network is used (and again before program exit), any
 
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      runnable programs found in the network hook directory are run
 
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      with the argument <quote><literal>start</literal></quote> or
 
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      <quote><literal>stop</literal></quote>.  This should bring up or
 
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      down, respectively, any network interface which
 
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      <command>&COMMANDNAME;</command> should use.
 
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    </para>
 
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    <refsect2 id="hook-requirements">
 
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      <title>REQUIREMENTS</title>
 
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      <para>
 
469
        A network hook must be an executable file, and its name must
 
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        consist entirely of upper and lower case letters, digits,
 
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        underscores, periods, and hyphens.
 
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      </para>
 
473
      <para>
 
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        A network hook will receive one argument, which can be one of
 
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        the following:
 
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      </para>
 
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      <variablelist>
 
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        <varlistentry>
 
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          <term><literal>start</literal></term>
 
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          <listitem>
 
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            <para>
 
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              This should make the network hook create (if necessary)
 
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              and bring up a network interface.
 
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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><literal>stop</literal></term>
 
489
          <listitem>
 
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            <para>
 
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              This should make the network hook take down a network
 
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              interface, and delete it if it did not exist previously.
 
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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><literal>files</literal></term>
 
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          <listitem>
 
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            <para>
 
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              This should make the network hook print, <emphasis>one
 
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              file per line</emphasis>, all the files needed for it to
 
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              run.  (These files will be copied into the initial RAM
 
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              filesystem.)  Typical use is for a network hook which is
 
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              a shell script to print its needed binaries.
 
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            </para>
 
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            <para>
 
507
              It is not necessary to print any non-executable files
 
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              already in the network hook directory, these will be
 
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              copied implicitly if they otherwise satisfy the name
 
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              requirement.
 
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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><literal>modules</literal></term>
 
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          <listitem>
 
517
            <para>
 
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              This should make the network hook print, <emphasis>on
 
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              separate lines</emphasis>, all the kernel modules needed
 
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              for it to run.  (These modules will be copied into the
 
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              initial RAM filesystem.)  For instance, a tunnel
 
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              interface needs the
 
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              <quote><literal>tun</literal></quote> module.
 
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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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        The network hook will be provided with a number of environment
 
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        variables:
 
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      </para>
 
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      <variablelist>
 
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        <varlistentry>
 
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          <term><envar>MANDOSNETHOOKDIR</envar></term>
 
535
          <listitem>
 
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            <para>
 
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              The network hook directory, specified to
 
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              <command>&COMMANDNAME;</command> by the
 
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              <option>--network-hook-dir</option> option.  Note: this
 
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              should <emphasis>always</emphasis> be used by the
 
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              network hook to refer to itself or any files in the hook
 
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              directory it may require.
 
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            </para>
 
544
          </listitem>
 
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        </varlistentry>
 
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        <varlistentry>
 
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          <term><envar>DEVICE</envar></term>
 
548
          <listitem>
 
549
            <para>
 
550
              The network interface, as specified to
 
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              <command>&COMMANDNAME;</command> by the
 
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              <option>--interface</option> option.  If this is not the
 
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              interface a hook will bring up, there is no reason for a
 
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              hook to continue.
 
555
            </para>
 
556
          </listitem>
 
557
        </varlistentry>
 
558
        <varlistentry>
 
559
          <term><envar>MODE</envar></term>
 
560
          <listitem>
 
561
            <para>
 
562
              This will be the same as the first argument;
 
563
              i.e. <quote><literal>start</literal></quote>,
 
564
              <quote><literal>stop</literal></quote>,
 
565
              <quote><literal>files</literal></quote>, or
 
566
              <quote><literal>modules</literal></quote>.
 
567
            </para>
 
568
          </listitem>
 
569
        </varlistentry>
 
570
        <varlistentry>
 
571
          <term><envar>VERBOSITY</envar></term>
 
572
          <listitem>
 
573
            <para>
 
574
              This will be the <quote><literal>1</literal></quote> if
 
575
              the <option>--debug</option> option is passed to
 
576
              <command>&COMMANDNAME;</command>, otherwise
 
577
              <quote><literal>0</literal></quote>.
 
578
            </para>
 
579
          </listitem>
 
580
        </varlistentry>
 
581
        <varlistentry>
 
582
          <term><envar>DELAY</envar></term>
 
583
          <listitem>
 
584
            <para>
 
585
              This will be the same as the <option>--delay</option>
 
586
              option passed to <command>&COMMANDNAME;</command>.  Is
 
587
              only set if <envar>MODE</envar> is
 
588
              <quote><literal>start</literal></quote> or
 
589
              <quote><literal>stop</literal></quote>.
 
590
            </para>
 
591
          </listitem>
 
592
        </varlistentry>
 
593
        <varlistentry>
 
594
          <term><envar>CONNECT</envar></term>
 
595
          <listitem>
 
596
            <para>
 
597
              This will be the same as the <option>--connect</option>
 
598
              option passed to <command>&COMMANDNAME;</command>.  Is
 
599
              only set if <option>--connect</option> is passed and
 
600
              <envar>MODE</envar> is
 
601
              <quote><literal>start</literal></quote> or
 
602
              <quote><literal>stop</literal></quote>.
 
603
            </para>
 
604
          </listitem>
 
605
        </varlistentry>
 
606
      </variablelist>
 
607
      <para>
 
608
        A hook may not read from standard input, and should be
 
609
        restrictive in printing to standard output or standard error
 
610
        unless <varname>VERBOSITY</varname> is
 
611
        <quote><literal>1</literal></quote>.
 
612
      </para>
 
613
    </refsect2>
 
614
  </refsect1>
 
615
  
407
616
  <refsect1 id="files">
408
617
    <title>FILES</title>
409
618
    <variablelist>
421
630
          </para>
422
631
        </listitem>
423
632
      </varlistentry>
 
633
      <varlistentry>
 
634
        <term><filename
 
635
        class="directory">/lib/mandos/network-hooks.d</filename></term>
 
636
        <listitem>
 
637
          <para>
 
638
            Directory where network hooks are located.  Change this
 
639
            with the <option>--network-hook-dir</option> option.  See
 
640
            <xref linkend="network-hooks"/>.
 
641
          </para>
 
642
        </listitem>
 
643
      </varlistentry>
424
644
    </variablelist>
425
645
  </refsect1>
426
646
  
535
755
  <refsect1 id="see_also">
536
756
    <title>SEE ALSO</title>
537
757
    <para>
 
758
      <citerefentry><refentrytitle>intro</refentrytitle>
 
759
      <manvolnum>8mandos</manvolnum></citerefentry>,
538
760
      <citerefentry><refentrytitle>cryptsetup</refentrytitle>
539
761
      <manvolnum>8</manvolnum></citerefentry>,
540
762
      <citerefentry><refentrytitle>crypttab</refentrytitle>