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  • Committer: Teddy Hogeborn
  • Date: 2012-06-15 17:18:34 UTC
  • mto: (301.1.1 release) (237.7.272 trunk)
  • mto: This revision was merged to the branch mainline in revision 302.
  • Revision ID: teddy@recompile.se-20120615171834-gzzgknth003j903u
* plugins.d/mandos-client.c (main): Bug fix: Set DEVICE environment
                                    variable correctly for network
                                    hooks.  Also, don't call
                                    run_network_hooks() with NULL
                                    value.

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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 "2009-01-04">
 
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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
123
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      communicates with <citerefentry><refentrytitle
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      >mandos</refentrytitle><manvolnum>8</manvolnum></citerefentry>
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      to get a password.  It uses IPv6 link-local addresses to get
126
 
      network connectivity, Zeroconf to find servers, and TLS with an
127
 
      OpenPGP key to ensure authenticity and confidentiality.  It
128
 
      keeps running, trying all servers on the network, until it
129
 
      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
 
143
      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
 
146
      confidentiality.  This client program keeps running, trying all
 
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      servers on the network, until it receives a satisfactory reply
 
148
      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>
 
153
      The network interfaces are selected like this: If any interfaces
 
154
      are specified using the <option>--interface</option> option,
 
155
      those interface are used.  Otherwise,
 
156
      <command>&COMMANDNAME;</command> will use all interfaces that
 
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      are not loopback interfaces, are not point-to-point interfaces,
 
158
      are capable of broadcasting and do not have the NOARP flag (see
 
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      <citerefentry><refentrytitle>netdevice</refentrytitle>
 
160
      <manvolnum>7</manvolnum></citerefentry>).  (If the
 
161
      <option>--connect</option> option is used, point-to-point
 
162
      interfaces and non-broadcast interfaces are accepted.)  If any
 
163
      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"/>.
130
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    </para>
131
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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>
189
 
        <term><option>--interface=
190
 
        <replaceable>NAME</replaceable></option></term>
 
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        <term><option>--interface=<replaceable
 
229
        >NAME</replaceable></option></term>
191
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        <term><option>-i
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        <replaceable>NAME</replaceable></option></term>
193
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        <listitem>
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          <para>
195
 
            Network interface that will be brought up and scanned for
196
 
            Mandos servers to connect to.  The default it
197
 
            <quote><literal>eth0</literal></quote>.
 
234
            Comma separated list of network interfaces that will be
 
235
            brought up and scanned for Mandos servers to connect to.
 
236
            The default is the empty string, which will automatically
 
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            use all appropriate interfaces.
198
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          </para>
199
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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.
203
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          </para>
 
244
          <para>
 
245
            Note that since this program will normally run in the
 
246
            initial RAM disk environment, the interface must be an
 
247
            interface which exists at that stage.  Thus, the interface
 
248
            can normally not be a pseudo-interface such as
 
249
            <quote>br0</quote> or <quote>tun0</quote>; such interfaces
 
250
            will not exist until much later in the boot process, and
 
251
            can not be used by this program, unless created by a
 
252
            <quote>network hook</quote> — see <xref
 
253
            linkend="network-hooks"/>.
 
254
          </para>
 
255
          <para>
 
256
            <replaceable>NAME</replaceable> can be the string
 
257
            <quote><literal>none</literal></quote>; this will not use
 
258
            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>
206
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251
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          </para>
252
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        </listitem>
253
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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
 
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            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
 
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            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>
254
353
      
255
354
      <varlistentry>
256
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        <term><option>--debug</option></term>
317
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      <refentrytitle>plugin-runner</refentrytitle>
318
417
      <manvolnum>8mandos</manvolnum></citerefentry>) is used to run
319
418
      both this program and others in in parallel,
320
 
      <emphasis>one</emphasis> of which will prompt for passwords on
321
 
      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.
322
423
    </para>
323
424
  </refsect1>
324
425
  
329
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      server could be found and the password received from it could be
330
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      successfully decrypted and output on standard output.  The
331
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      program will exit with a non-zero exit status only if a critical
332
 
      error occurs.  Otherwise, it will forever connect to new
333
 
      <application>Mandos</application> servers as they appear, trying
334
 
      to get a decryptable password and print it.
 
433
      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.
335
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    </para>
336
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  </refsect1>
337
438
  
345
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    </para>
346
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  </refsect1>
347
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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
  
348
618
  <refsect1 id="files">
349
619
    <title>FILES</title>
350
620
    <variablelist>
362
632
          </para>
363
633
        </listitem>
364
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>
365
646
    </variablelist>
366
647
  </refsect1>
367
648
  
382
663
    <informalexample>
383
664
      <para>
384
665
        Normal invocation needs no options, if the network interface
385
 
        is <quote>eth0</quote>:
 
666
        can be automatically determined:
386
667
      </para>
387
668
      <para>
388
669
        <userinput>&COMMANDNAME;</userinput>
412
693
    <informalexample>
413
694
      <para>
414
695
        Run in debug mode, with a custom key, and do not use Zeroconf
415
 
        to locate a server; connect directly to the IPv6 address
416
 
        <quote><systemitem class="ipaddress"
417
 
        >2001:db8:f983:bd0b:30de:ae4a:71f2:f672</systemitem></quote>,
418
 
        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:
419
700
      </para>
420
701
      <para>
421
702
 
422
703
<!-- do not wrap this line -->
423
 
<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>
424
705
 
425
706
      </para>
426
707
    </informalexample>
476
757
  <refsect1 id="see_also">
477
758
    <title>SEE ALSO</title>
478
759
    <para>
 
760
      <citerefentry><refentrytitle>intro</refentrytitle>
 
761
      <manvolnum>8mandos</manvolnum></citerefentry>,
479
762
      <citerefentry><refentrytitle>cryptsetup</refentrytitle>
480
763
      <manvolnum>8</manvolnum></citerefentry>,
481
764
      <citerefentry><refentrytitle>crypttab</refentrytitle>