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  • Committer: Teddy Hogeborn
  • Date: 2012-06-13 22:06:57 UTC
  • mto: (237.7.144 trunk)
  • mto: This revision was merged to the branch mainline in revision 302.
  • Revision ID: teddy@recompile.se-20120613220657-qvq7c7nrndl3t413
* plugins.d/mandos-client.c (get_flags): Don't clobber errno.
  (up_interface): Removed; replaced with "interface_is_up".
  (interface_is_up, interface_is_running,
   lower_privileges_permanently, take_down_interface): New.
  (bring_up_interface): Return "error_t".  Use new functions
                        "interface_is_up", "get_flags", and
                        "interface_is_running".
  (main): Save all interfaces either autodetected or specified with
          --interface in argz vector "interfaces".  Save interfaces to
          take down on exit in argz vector "interfaces_to_take_down".
          Save interface names for DEVICE variable to network hooks as
          argz_vector "interfaces_hooks".  Bug fix: Be privileged
          while stopping network hooks.
* plugins.d/mandos-client.xml (SYNOPSIS): Changed --interface synopsis.
  (DESCRIPTION): Updated to document use of all interfaces.
  (OPTIONS): Updated description of "--interface".
* network-hooks.d/bridge: Parse comma-separated DEVICE environment
                          variable.
* network-hooks.d/openvpn: - '' -
* network-hooks.d/wireless: - '' -

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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 "2008-10-03">
 
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<!ENTITY TIMESTAMP "2012-06-13">
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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>2012</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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        ><replaceable>PORT</replaceable></option></arg>
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      </group>
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      <sbr/>
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      <group>
 
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      <group rep='repeat'>
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        <arg choice="plain"><option>--interface
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        <replaceable>NAME</replaceable></option></arg>
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        <arg choice="plain"><option>-i
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        <replaceable>NAME</replaceable></option></arg>
 
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        <replaceable>NAME</replaceable><arg rep='repeat'
 
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        >,<replaceable>NAME</replaceable></arg></option></arg>
 
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        <arg choice="plain"><option>-i <replaceable>NAME</replaceable
 
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        ><arg rep='repeat'>,<replaceable>NAME</replaceable></arg
 
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        ></option></arg>
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      </group>
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      <sbr/>
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      <group>
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      </arg>
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      <sbr/>
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      <arg>
 
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        <option>--delay <replaceable>SECONDS</replaceable></option>
 
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      </arg>
 
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      <sbr/>
 
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      <arg>
 
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        <option>--retry <replaceable>SECONDS</replaceable></option>
 
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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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      <command>&COMMANDNAME;</command> is a client program that
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      communicates with <citerefentry><refentrytitle
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      >mandos</refentrytitle><manvolnum>8</manvolnum></citerefentry>
124
 
      to get a password.  It uses IPv6 link-local addresses to get
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      network connectivity, Zeroconf to find servers, and TLS with an
126
 
      OpenPGP key to ensure authenticity and confidentiality.  It
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      keeps running, trying all servers on the network, until it
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      receives a satisfactory reply or a TERM signal is received.
 
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      to get a password.  In slightly more detail, this client program
 
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      brings up network interfaces, uses the interfaces’ IPv6
 
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      link-local addresses to get network connectivity, uses Zeroconf
 
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      to find servers on the local network, and communicates with
 
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      servers 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.  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>
 
152
    <para>
 
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      The network interfaces are selected like this: If any interfaces
 
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      are specified using the <option>--interface</option> option,
 
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      those interface are used.  Otherwise,
 
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      <command>&COMMANDNAME;</command> will use all interfaces that
 
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      are not loopback interfaces, are not point-to-point interfaces,
 
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      are capable of broadcasting and do 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 any
 
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      used interfaces are not up and running, they are first taken up
 
164
      (and later taken down again on program exit).
 
165
    </para>
 
166
    <para>
 
167
      Before network interfaces are selected, all <quote>network
 
168
      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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      </varlistentry>
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      <varlistentry>
188
 
        <term><option>--interface=
189
 
        <replaceable>NAME</replaceable></option></term>
 
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        <term><option>--interface=<replaceable
 
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        >NAME</replaceable></option></term>
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        <term><option>-i
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        <replaceable>NAME</replaceable></option></term>
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        <listitem>
193
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          <para>
194
 
            Network interface that will be brought up and scanned for
195
 
            Mandos servers to connect to.  The default it
196
 
            <quote><literal>eth0</literal></quote>.
 
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            Comma separated list of network interfaces that will be
 
235
            brought up and scanned for Mandos servers to connect to.
 
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            The default is the empty string, which will automatically
 
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            use all appropriate interfaces.
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          </para>
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          <para>
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            If the <option>--connect</option> option is used, this
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            specifies the interface to use to connect to the address
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            given.
202
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          </para>
 
244
          <para>
 
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            Note that since this program will normally run in the
 
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            initial RAM disk environment, the interface must be an
 
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            interface which exists at that stage.  Thus, the interface
 
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            can normally not be a pseudo-interface such as
 
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            <quote>br0</quote> or <quote>tun0</quote>; such interfaces
 
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            will not exist until much later in the boot process, and
 
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            can not be used by this program, unless created by a
 
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            <quote>network hook</quote> — see <xref
 
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            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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            <quote><literal>none</literal></quote>; this will not use
 
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            any specific interface, and will not bring up an interface
 
259
            on startup.  This is not recommended, and only meant for
 
260
            advanced users.
 
261
          </para>
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        </listitem>
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      </varlistentry>
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250
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          </para>
251
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        </listitem>
252
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      </varlistentry>
 
312
 
 
313
      <varlistentry>
 
314
        <term><option>--delay=<replaceable
 
315
        >SECONDS</replaceable></option></term>
 
316
        <listitem>
 
317
          <para>
 
318
            After bringing a network interface up, the program waits
 
319
            for the interface to arrive in a <quote>running</quote>
 
320
            state before proceeding.  During this time, the kernel log
 
321
            level will be lowered to reduce clutter on the system
 
322
            console, alleviating any other plugins which might be
 
323
            using the system console.  This option sets the upper
 
324
            limit of seconds to wait.  The default is 2.5 seconds.
 
325
          </para>
 
326
        </listitem>
 
327
      </varlistentry>
 
328
 
 
329
      <varlistentry>
 
330
        <term><option>--retry=<replaceable
 
331
        >SECONDS</replaceable></option></term>
 
332
        <listitem>
 
333
          <para>
 
334
            All Mandos servers are tried repeatedly until a password
 
335
            is received.  This value specifies, in seconds, how long
 
336
            between each successive try <emphasis>for the same
 
337
            server</emphasis>.  The default is 10 seconds.
 
338
          </para>
 
339
        </listitem>
 
340
      </varlistentry>
 
341
 
 
342
      <varlistentry>
 
343
        <term><option>--network-hook-dir=<replaceable
 
344
        >DIR</replaceable></option></term>
 
345
        <listitem>
 
346
          <para>
 
347
            Network hook directory.  The default directory is
 
348
            <quote><filename class="directory"
 
349
            >/lib/mandos/network-hooks.d</filename></quote>.
 
350
          </para>
 
351
        </listitem>
 
352
      </varlistentry>
253
353
      
254
354
      <varlistentry>
255
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        <term><option>--debug</option></term>
316
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      <refentrytitle>plugin-runner</refentrytitle>
317
417
      <manvolnum>8mandos</manvolnum></citerefentry>) is used to run
318
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      both this program and others in in parallel,
319
 
      <emphasis>one</emphasis> of which will prompt for passwords on
320
 
      the system console.
 
419
      <emphasis>one</emphasis> of which (<citerefentry>
 
420
      <refentrytitle>password-prompt</refentrytitle>
 
421
      <manvolnum>8mandos</manvolnum></citerefentry>) will prompt for
 
422
      passwords on the system console.
321
423
    </para>
322
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  </refsect1>
323
425
  
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      server could be found and the password received from it could be
329
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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
331
 
      error occurs.  Otherwise, it will forever connect to new
332
 
      <application>Mandos</application> servers as they appear, trying
333
 
      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.
334
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    </para>
335
437
  </refsect1>
336
438
  
344
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    </para>
345
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  </refsect1>
346
448
  
 
449
  <refsect1 id="network-hooks">
 
450
    <title>NETWORK HOOKS</title>
 
451
    <para>
 
452
      If a network interface like a bridge or tunnel is required to
 
453
      find a Mandos server, this requires the interface to be up and
 
454
      running before <command>&COMMANDNAME;</command> starts looking
 
455
      for Mandos servers.  This can be accomplished by creating a
 
456
      <quote>network hook</quote> program, and placing it in a special
 
457
      directory.
 
458
    </para>
 
459
    <para>
 
460
      Before the network is used (and again before program exit), any
 
461
      runnable programs found in the network hook directory are run
 
462
      with the argument <quote><literal>start</literal></quote> or
 
463
      <quote><literal>stop</literal></quote>.  This should bring up or
 
464
      down, respectively, any network interface which
 
465
      <command>&COMMANDNAME;</command> should use.
 
466
    </para>
 
467
    <refsect2 id="hook-requirements">
 
468
      <title>REQUIREMENTS</title>
 
469
      <para>
 
470
        A network hook must be an executable file, and its name must
 
471
        consist entirely of upper and lower case letters, digits,
 
472
        underscores, periods, and hyphens.
 
473
      </para>
 
474
      <para>
 
475
        A network hook will receive one argument, which can be one of
 
476
        the following:
 
477
      </para>
 
478
      <variablelist>
 
479
        <varlistentry>
 
480
          <term><literal>start</literal></term>
 
481
          <listitem>
 
482
            <para>
 
483
              This should make the network hook create (if necessary)
 
484
              and bring up a network interface.
 
485
            </para>
 
486
          </listitem>
 
487
        </varlistentry>
 
488
        <varlistentry>
 
489
          <term><literal>stop</literal></term>
 
490
          <listitem>
 
491
            <para>
 
492
              This should make the network hook take down a network
 
493
              interface, and delete it if it did not exist previously.
 
494
            </para>
 
495
          </listitem>
 
496
        </varlistentry>
 
497
        <varlistentry>
 
498
          <term><literal>files</literal></term>
 
499
          <listitem>
 
500
            <para>
 
501
              This should make the network hook print, <emphasis>one
 
502
              file per line</emphasis>, all the files needed for it to
 
503
              run.  (These files will be copied into the initial RAM
 
504
              filesystem.)  Typical use is for a network hook which is
 
505
              a shell script to print its needed binaries.
 
506
            </para>
 
507
            <para>
 
508
              It is not necessary to print any non-executable files
 
509
              already in the network hook directory, these will be
 
510
              copied implicitly if they otherwise satisfy the name
 
511
              requirement.
 
512
            </para>
 
513
          </listitem>
 
514
        </varlistentry>
 
515
        <varlistentry>
 
516
          <term><literal>modules</literal></term>
 
517
          <listitem>
 
518
            <para>
 
519
              This should make the network hook print, <emphasis>on
 
520
              separate lines</emphasis>, all the kernel modules needed
 
521
              for it to run.  (These modules will be copied into the
 
522
              initial RAM filesystem.)  For instance, a tunnel
 
523
              interface needs the
 
524
              <quote><literal>tun</literal></quote> module.
 
525
            </para>
 
526
          </listitem>
 
527
        </varlistentry>
 
528
      </variablelist>
 
529
      <para>
 
530
        The network hook will be provided with a number of environment
 
531
        variables:
 
532
      </para>
 
533
      <variablelist>
 
534
        <varlistentry>
 
535
          <term><envar>MANDOSNETHOOKDIR</envar></term>
 
536
          <listitem>
 
537
            <para>
 
538
              The network hook directory, specified to
 
539
              <command>&COMMANDNAME;</command> by the
 
540
              <option>--network-hook-dir</option> option.  Note: this
 
541
              should <emphasis>always</emphasis> be used by the
 
542
              network hook to refer to itself or any files in the hook
 
543
              directory it may require.
 
544
            </para>
 
545
          </listitem>
 
546
        </varlistentry>
 
547
        <varlistentry>
 
548
          <term><envar>DEVICE</envar></term>
 
549
          <listitem>
 
550
            <para>
 
551
              The network interfaces, as specified to
 
552
              <command>&COMMANDNAME;</command> by the
 
553
              <option>--interface</option> option, combined to one
 
554
              string and separated by commas.  If this is set, and
 
555
              does not contain the interface a hook will bring up,
 
556
              there is no reason for a hook to continue.
 
557
            </para>
 
558
          </listitem>
 
559
        </varlistentry>
 
560
        <varlistentry>
 
561
          <term><envar>MODE</envar></term>
 
562
          <listitem>
 
563
            <para>
 
564
              This will be the same as the first argument;
 
565
              i.e. <quote><literal>start</literal></quote>,
 
566
              <quote><literal>stop</literal></quote>,
 
567
              <quote><literal>files</literal></quote>, or
 
568
              <quote><literal>modules</literal></quote>.
 
569
            </para>
 
570
          </listitem>
 
571
        </varlistentry>
 
572
        <varlistentry>
 
573
          <term><envar>VERBOSITY</envar></term>
 
574
          <listitem>
 
575
            <para>
 
576
              This will be the <quote><literal>1</literal></quote> if
 
577
              the <option>--debug</option> option is passed to
 
578
              <command>&COMMANDNAME;</command>, otherwise
 
579
              <quote><literal>0</literal></quote>.
 
580
            </para>
 
581
          </listitem>
 
582
        </varlistentry>
 
583
        <varlistentry>
 
584
          <term><envar>DELAY</envar></term>
 
585
          <listitem>
 
586
            <para>
 
587
              This will be the same as the <option>--delay</option>
 
588
              option passed to <command>&COMMANDNAME;</command>.  Is
 
589
              only set if <envar>MODE</envar> is
 
590
              <quote><literal>start</literal></quote> or
 
591
              <quote><literal>stop</literal></quote>.
 
592
            </para>
 
593
          </listitem>
 
594
        </varlistentry>
 
595
        <varlistentry>
 
596
          <term><envar>CONNECT</envar></term>
 
597
          <listitem>
 
598
            <para>
 
599
              This will be the same as the <option>--connect</option>
 
600
              option passed to <command>&COMMANDNAME;</command>.  Is
 
601
              only set if <option>--connect</option> is passed and
 
602
              <envar>MODE</envar> is
 
603
              <quote><literal>start</literal></quote> or
 
604
              <quote><literal>stop</literal></quote>.
 
605
            </para>
 
606
          </listitem>
 
607
        </varlistentry>
 
608
      </variablelist>
 
609
      <para>
 
610
        A hook may not read from standard input, and should be
 
611
        restrictive in printing to standard output or standard error
 
612
        unless <varname>VERBOSITY</varname> is
 
613
        <quote><literal>1</literal></quote>.
 
614
      </para>
 
615
    </refsect2>
 
616
  </refsect1>
 
617
  
347
618
  <refsect1 id="files">
348
619
    <title>FILES</title>
349
620
    <variablelist>
361
632
          </para>
362
633
        </listitem>
363
634
      </varlistentry>
 
635
      <varlistentry>
 
636
        <term><filename
 
637
        class="directory">/lib/mandos/network-hooks.d</filename></term>
 
638
        <listitem>
 
639
          <para>
 
640
            Directory where network hooks are located.  Change this
 
641
            with the <option>--network-hook-dir</option> option.  See
 
642
            <xref linkend="network-hooks"/>.
 
643
          </para>
 
644
        </listitem>
 
645
      </varlistentry>
364
646
    </variablelist>
365
647
  </refsect1>
366
648
  
381
663
    <informalexample>
382
664
      <para>
383
665
        Normal invocation needs no options, if the network interface
384
 
        is <quote>eth0</quote>:
 
666
        can be automatically determined:
385
667
      </para>
386
668
      <para>
387
669
        <userinput>&COMMANDNAME;</userinput>
411
693
    <informalexample>
412
694
      <para>
413
695
        Run in debug mode, with a custom key, and do not use Zeroconf
414
 
        to locate a server; connect directly to the IPv6 address
415
 
        <quote><systemitem class="ipaddress"
416
 
        >2001:db8:f983:bd0b:30de:ae4a:71f2:f672</systemitem></quote>,
417
 
        port 4711, using interface eth2:
 
696
        to locate a server; connect directly to the IPv6 link-local
 
697
        address <quote><systemitem class="ipaddress"
 
698
        >fe80::aede:48ff:fe71:f6f2</systemitem></quote>, port 4711,
 
699
        using interface eth2:
418
700
      </para>
419
701
      <para>
420
702
 
421
703
<!-- do not wrap this line -->
422
 
<userinput>&COMMANDNAME; --debug --pubkey keydir/pubkey.txt --seckey keydir/seckey.txt --connect 2001:db8:f983:bd0b:30de:ae4a:71f2:f672:4711 --interface eth2</userinput>
 
704
<userinput>&COMMANDNAME; --debug --pubkey keydir/pubkey.txt --seckey keydir/seckey.txt --connect fe80::aede:48ff:fe71:f6f2:4711 --interface eth2</userinput>
423
705
 
424
706
      </para>
425
707
    </informalexample>
475
757
  <refsect1 id="see_also">
476
758
    <title>SEE ALSO</title>
477
759
    <para>
 
760
      <citerefentry><refentrytitle>intro</refentrytitle>
 
761
      <manvolnum>8mandos</manvolnum></citerefentry>,
478
762
      <citerefentry><refentrytitle>cryptsetup</refentrytitle>
479
763
      <manvolnum>8</manvolnum></citerefentry>,
480
764
      <citerefentry><refentrytitle>crypttab</refentrytitle>