/mandos/trunk

To get this branch, use:
bzr branch http://bzr.recompile.se/loggerhead/mandos/trunk

« back to all changes in this revision

Viewing changes to plugins.d/mandos-client.xml

  • Committer: Teddy Hogeborn
  • Date: 2009-01-06 22:54:01 UTC
  • Revision ID: teddy@fukt.bsnet.se-20090106225401-7l9f7s3hw9eissra
* mandos (main): Try to find non-privileged user+group in pairs, so
                 that mismatched pairs are never used.

Show diffs side-by-side

added added

removed removed

Lines of Context:
plugins.d/mandos-client.xml
2
2
<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
3
3
        "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
4
4
<!ENTITY COMMANDNAME "mandos-client">
5
 
<!ENTITY TIMESTAMP "2012-06-17">
 
5
<!ENTITY TIMESTAMP "2009-01-04">
6
6
<!ENTITY % common SYSTEM "../common.ent">
7
7
%common;
8
8
]>
19
19
        <firstname>Björn</firstname>
20
20
        <surname>Påhlsson</surname>
21
21
        <address>
22
 
          <email>belorn@recompile.se</email>
 
22
          <email>belorn@fukt.bsnet.se</email>
23
23
        </address>
24
24
      </author>
25
25
      <author>
26
26
        <firstname>Teddy</firstname>
27
27
        <surname>Hogeborn</surname>
28
28
        <address>
29
 
          <email>teddy@recompile.se</email>
 
29
          <email>teddy@fukt.bsnet.se</email>
30
30
        </address>
31
31
      </author>
32
32
    </authorgroup>
33
33
    <copyright>
34
34
      <year>2008</year>
35
35
      <year>2009</year>
36
 
      <year>2012</year>
37
36
      <holder>Teddy Hogeborn</holder>
38
37
      <holder>Björn Påhlsson</holder>
39
38
    </copyright>
64
63
        ><replaceable>PORT</replaceable></option></arg>
65
64
      </group>
66
65
      <sbr/>
67
 
      <group rep='repeat'>
 
66
      <group>
68
67
        <arg choice="plain"><option>--interface
69
 
        <replaceable>NAME</replaceable><arg rep='repeat'
70
 
        >,<replaceable>NAME</replaceable></arg></option></arg>
71
 
        <arg choice="plain"><option>-i <replaceable>NAME</replaceable
72
 
        ><arg rep='repeat'>,<replaceable>NAME</replaceable></arg
73
 
        ></option></arg>
 
68
        <replaceable>NAME</replaceable></option></arg>
 
69
        <arg choice="plain"><option>-i
 
70
        <replaceable>NAME</replaceable></option></arg>
74
71
      </group>
75
72
      <sbr/>
76
73
      <group>
96
93
      </arg>
97
94
      <sbr/>
98
95
      <arg>
99
 
        <option>--delay <replaceable>SECONDS</replaceable></option>
100
 
      </arg>
101
 
      <sbr/>
102
 
      <arg>
103
 
        <option>--retry <replaceable>SECONDS</replaceable></option>
104
 
      </arg>
105
 
      <sbr/>
106
 
      <arg>
107
 
        <option>--network-hook-dir
108
 
        <replaceable>DIR</replaceable></option>
109
 
      </arg>
110
 
      <sbr/>
111
 
      <arg>
112
96
        <option>--debug</option>
113
97
      </arg>
114
98
    </cmdsynopsis>
138
122
      <command>&COMMANDNAME;</command> is a client program that
139
123
      communicates with <citerefentry><refentrytitle
140
124
      >mandos</refentrytitle><manvolnum>8</manvolnum></citerefentry>
141
 
      to get a password.  In slightly more detail, this client program
142
 
      brings up network interfaces, uses the interfaces’ IPv6
143
 
      link-local addresses to get network connectivity, uses Zeroconf
144
 
      to find servers on the local network, and communicates with
145
 
      servers using TLS with an OpenPGP key to ensure authenticity and
146
 
      confidentiality.  This client program keeps running, trying all
147
 
      servers on the network, until it receives a satisfactory reply
148
 
      or a TERM signal.  After all servers have been tried, all
149
 
      servers are periodically retried.  If no servers are found it
150
 
      will wait indefinitely for new servers to appear.
151
 
    </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
157
 
      are not loopback interfaces, are not point-to-point interfaces,
158
 
      are capable of broadcasting and do not have the NOARP flag (see
159
 
      <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"/>.
 
125
      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.
169
130
    </para>
170
131
    <para>
171
132
      This program is not meant to be run directly; it is really meant
225
186
      </varlistentry>
226
187
      
227
188
      <varlistentry>
228
 
        <term><option>--interface=<replaceable
229
 
        >NAME</replaceable><arg rep='repeat'>,<replaceable
230
 
        >NAME</replaceable></arg></option></term>
 
189
        <term><option>--interface=
 
190
        <replaceable>NAME</replaceable></option></term>
231
191
        <term><option>-i
232
 
        <replaceable>NAME</replaceable><arg rep='repeat'>,<replaceable
233
 
        >NAME</replaceable></arg></option></term>
 
192
        <replaceable>NAME</replaceable></option></term>
234
193
        <listitem>
235
194
          <para>
236
 
            Comma separated list of network interfaces that will be
237
 
            brought up and scanned for Mandos servers to connect to.
238
 
            The default is the empty string, which will automatically
239
 
            use all appropriate interfaces.
240
 
          </para>
241
 
          <para>
242
 
            If the <option>--connect</option> option is used, and
243
 
            exactly one interface name is specified (except
244
 
            <quote><literal>none</literal></quote>), this specifies
245
 
            the interface to use to connect to the address given.
246
 
          </para>
247
 
          <para>
248
 
            Note that since this program will normally run in the
249
 
            initial RAM disk environment, the interface must be an
250
 
            interface which exists at that stage.  Thus, the interface
251
 
            can normally not be a pseudo-interface such as
252
 
            <quote>br0</quote> or <quote>tun0</quote>; such interfaces
253
 
            will not exist until much later in the boot process, and
254
 
            can not be used by this program, unless created by a
255
 
            <quote>network hook</quote> — see <xref
256
 
            linkend="network-hooks"/>.
257
 
          </para>
258
 
          <para>
259
 
            <replaceable>NAME</replaceable> can be the string
260
 
            <quote><literal>none</literal></quote>; this will make
261
 
            <command>&COMMANDNAME;</command> not bring up
262
 
            <emphasis>any</emphasis> interfaces specified
263
 
            <emphasis>after</emphasis> this string.  This is not
264
 
            recommended, and only meant for advanced users.
 
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>.
 
198
          </para>
 
199
          <para>
 
200
            If the <option>--connect</option> option is used, this
 
201
            specifies the interface to use to connect to the address
 
202
            given.
265
203
          </para>
266
204
        </listitem>
267
205
      </varlistentry>
313
251
          </para>
314
252
        </listitem>
315
253
      </varlistentry>
316
 
 
317
 
      <varlistentry>
318
 
        <term><option>--delay=<replaceable
319
 
        >SECONDS</replaceable></option></term>
320
 
        <listitem>
321
 
          <para>
322
 
            After bringing a network interface up, the program waits
323
 
            for the interface to arrive in a <quote>running</quote>
324
 
            state before proceeding.  During this time, the kernel log
325
 
            level will be lowered to reduce clutter on the system
326
 
            console, alleviating any other plugins which might be
327
 
            using the system console.  This option sets the upper
328
 
            limit of seconds to wait.  The default is 2.5 seconds.
329
 
          </para>
330
 
        </listitem>
331
 
      </varlistentry>
332
 
 
333
 
      <varlistentry>
334
 
        <term><option>--retry=<replaceable
335
 
        >SECONDS</replaceable></option></term>
336
 
        <listitem>
337
 
          <para>
338
 
            All Mandos servers are tried repeatedly until a password
339
 
            is received.  This value specifies, in seconds, how long
340
 
            between each successive try <emphasis>for the same
341
 
            server</emphasis>.  The default is 10 seconds.
342
 
          </para>
343
 
        </listitem>
344
 
      </varlistentry>
345
 
 
346
 
      <varlistentry>
347
 
        <term><option>--network-hook-dir=<replaceable
348
 
        >DIR</replaceable></option></term>
349
 
        <listitem>
350
 
          <para>
351
 
            Network hook directory.  The default directory is
352
 
            <quote><filename class="directory"
353
 
            >/lib/mandos/network-hooks.d</filename></quote>.
354
 
          </para>
355
 
        </listitem>
356
 
      </varlistentry>
357
254
      
358
255
      <varlistentry>
359
256
        <term><option>--debug</option></term>
420
317
      <refentrytitle>plugin-runner</refentrytitle>
421
318
      <manvolnum>8mandos</manvolnum></citerefentry>) is used to run
422
319
      both this program and others in in parallel,
423
 
      <emphasis>one</emphasis> of which (<citerefentry>
424
 
      <refentrytitle>password-prompt</refentrytitle>
425
 
      <manvolnum>8mandos</manvolnum></citerefentry>) will prompt for
426
 
      passwords on the system console.
 
320
      <emphasis>one</emphasis> of which will prompt for passwords on
 
321
      the system console.
427
322
    </para>
428
323
  </refsect1>
429
324
  
434
329
      server could be found and the password received from it could be
435
330
      successfully decrypted and output on standard output.  The
436
331
      program will exit with a non-zero exit status only if a critical
437
 
      error occurs.  Otherwise, it will forever connect to any
438
 
      discovered <application>Mandos</application> servers, trying to
439
 
      get a decryptable password and print it.
 
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.
440
335
    </para>
441
336
  </refsect1>
442
337
  
450
345
    </para>
451
346
  </refsect1>
452
347
  
453
 
  <refsect1 id="network-hooks">
454
 
    <title>NETWORK HOOKS</title>
455
 
    <para>
456
 
      If a network interface like a bridge or tunnel is required to
457
 
      find a Mandos server, this requires the interface to be up and
458
 
      running before <command>&COMMANDNAME;</command> starts looking
459
 
      for Mandos servers.  This can be accomplished by creating a
460
 
      <quote>network hook</quote> program, and placing it in a special
461
 
      directory.
462
 
    </para>
463
 
    <para>
464
 
      Before the network is used (and again before program exit), any
465
 
      runnable programs found in the network hook directory are run
466
 
      with the argument <quote><literal>start</literal></quote> or
467
 
      <quote><literal>stop</literal></quote>.  This should bring up or
468
 
      down, respectively, any network interface which
469
 
      <command>&COMMANDNAME;</command> should use.
470
 
    </para>
471
 
    <refsect2 id="hook-requirements">
472
 
      <title>REQUIREMENTS</title>
473
 
      <para>
474
 
        A network hook must be an executable file, and its name must
475
 
        consist entirely of upper and lower case letters, digits,
476
 
        underscores, periods, and hyphens.
477
 
      </para>
478
 
      <para>
479
 
        A network hook will receive one argument, which can be one of
480
 
        the following:
481
 
      </para>
482
 
      <variablelist>
483
 
        <varlistentry>
484
 
          <term><literal>start</literal></term>
485
 
          <listitem>
486
 
            <para>
487
 
              This should make the network hook create (if necessary)
488
 
              and bring up a network interface.
489
 
            </para>
490
 
          </listitem>
491
 
        </varlistentry>
492
 
        <varlistentry>
493
 
          <term><literal>stop</literal></term>
494
 
          <listitem>
495
 
            <para>
496
 
              This should make the network hook take down a network
497
 
              interface, and delete it if it did not exist previously.
498
 
            </para>
499
 
          </listitem>
500
 
        </varlistentry>
501
 
        <varlistentry>
502
 
          <term><literal>files</literal></term>
503
 
          <listitem>
504
 
            <para>
505
 
              This should make the network hook print, <emphasis>one
506
 
              file per line</emphasis>, all the files needed for it to
507
 
              run.  (These files will be copied into the initial RAM
508
 
              filesystem.)  Typical use is for a network hook which is
509
 
              a shell script to print its needed binaries.
510
 
            </para>
511
 
            <para>
512
 
              It is not necessary to print any non-executable files
513
 
              already in the network hook directory, these will be
514
 
              copied implicitly if they otherwise satisfy the name
515
 
              requirement.
516
 
            </para>
517
 
          </listitem>
518
 
        </varlistentry>
519
 
        <varlistentry>
520
 
          <term><literal>modules</literal></term>
521
 
          <listitem>
522
 
            <para>
523
 
              This should make the network hook print, <emphasis>on
524
 
              separate lines</emphasis>, all the kernel modules needed
525
 
              for it to run.  (These modules will be copied into the
526
 
              initial RAM filesystem.)  For instance, a tunnel
527
 
              interface needs the
528
 
              <quote><literal>tun</literal></quote> module.
529
 
            </para>
530
 
          </listitem>
531
 
        </varlistentry>
532
 
      </variablelist>
533
 
      <para>
534
 
        The network hook will be provided with a number of environment
535
 
        variables:
536
 
      </para>
537
 
      <variablelist>
538
 
        <varlistentry>
539
 
          <term><envar>MANDOSNETHOOKDIR</envar></term>
540
 
          <listitem>
541
 
            <para>
542
 
              The network hook directory, specified to
543
 
              <command>&COMMANDNAME;</command> by the
544
 
              <option>--network-hook-dir</option> option.  Note: this
545
 
              should <emphasis>always</emphasis> be used by the
546
 
              network hook to refer to itself or any files in the hook
547
 
              directory it may require.
548
 
            </para>
549
 
          </listitem>
550
 
        </varlistentry>
551
 
        <varlistentry>
552
 
          <term><envar>DEVICE</envar></term>
553
 
          <listitem>
554
 
            <para>
555
 
              The network interfaces, as specified to
556
 
              <command>&COMMANDNAME;</command> by the
557
 
              <option>--interface</option> option, combined to one
558
 
              string and separated by commas.  If this is set, and
559
 
              does not contain the interface a hook will bring up,
560
 
              there is no reason for a hook to continue.
561
 
            </para>
562
 
          </listitem>
563
 
        </varlistentry>
564
 
        <varlistentry>
565
 
          <term><envar>MODE</envar></term>
566
 
          <listitem>
567
 
            <para>
568
 
              This will be the same as the first argument;
569
 
              i.e. <quote><literal>start</literal></quote>,
570
 
              <quote><literal>stop</literal></quote>,
571
 
              <quote><literal>files</literal></quote>, or
572
 
              <quote><literal>modules</literal></quote>.
573
 
            </para>
574
 
          </listitem>
575
 
        </varlistentry>
576
 
        <varlistentry>
577
 
          <term><envar>VERBOSITY</envar></term>
578
 
          <listitem>
579
 
            <para>
580
 
              This will be the <quote><literal>1</literal></quote> if
581
 
              the <option>--debug</option> option is passed to
582
 
              <command>&COMMANDNAME;</command>, otherwise
583
 
              <quote><literal>0</literal></quote>.
584
 
            </para>
585
 
          </listitem>
586
 
        </varlistentry>
587
 
        <varlistentry>
588
 
          <term><envar>DELAY</envar></term>
589
 
          <listitem>
590
 
            <para>
591
 
              This will be the same as the <option>--delay</option>
592
 
              option passed to <command>&COMMANDNAME;</command>.  Is
593
 
              only set if <envar>MODE</envar> is
594
 
              <quote><literal>start</literal></quote> or
595
 
              <quote><literal>stop</literal></quote>.
596
 
            </para>
597
 
          </listitem>
598
 
        </varlistentry>
599
 
        <varlistentry>
600
 
          <term><envar>CONNECT</envar></term>
601
 
          <listitem>
602
 
            <para>
603
 
              This will be the same as the <option>--connect</option>
604
 
              option passed to <command>&COMMANDNAME;</command>.  Is
605
 
              only set if <option>--connect</option> is passed and
606
 
              <envar>MODE</envar> is
607
 
              <quote><literal>start</literal></quote> or
608
 
              <quote><literal>stop</literal></quote>.
609
 
            </para>
610
 
          </listitem>
611
 
        </varlistentry>
612
 
      </variablelist>
613
 
      <para>
614
 
        A hook may not read from standard input, and should be
615
 
        restrictive in printing to standard output or standard error
616
 
        unless <varname>VERBOSITY</varname> is
617
 
        <quote><literal>1</literal></quote>.
618
 
      </para>
619
 
    </refsect2>
620
 
  </refsect1>
621
 
  
622
348
  <refsect1 id="files">
623
349
    <title>FILES</title>
624
350
    <variablelist>
636
362
          </para>
637
363
        </listitem>
638
364
      </varlistentry>
639
 
      <varlistentry>
640
 
        <term><filename
641
 
        class="directory">/lib/mandos/network-hooks.d</filename></term>
642
 
        <listitem>
643
 
          <para>
644
 
            Directory where network hooks are located.  Change this
645
 
            with the <option>--network-hook-dir</option> option.  See
646
 
            <xref linkend="network-hooks"/>.
647
 
          </para>
648
 
        </listitem>
649
 
      </varlistentry>
650
365
    </variablelist>
651
366
  </refsect1>
652
367
  
667
382
    <informalexample>
668
383
      <para>
669
384
        Normal invocation needs no options, if the network interface
670
 
        can be automatically determined:
 
385
        is <quote>eth0</quote>:
671
386
      </para>
672
387
      <para>
673
388
        <userinput>&COMMANDNAME;</userinput>
697
412
    <informalexample>
698
413
      <para>
699
414
        Run in debug mode, with a custom key, and do not use Zeroconf
700
 
        to locate a server; connect directly to the IPv6 link-local
701
 
        address <quote><systemitem class="ipaddress"
702
 
        >fe80::aede:48ff:fe71:f6f2</systemitem></quote>, port 4711,
703
 
        using interface eth2:
 
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:
704
419
      </para>
705
420
      <para>
706
421
 
707
422
<!-- do not wrap this line -->
708
 
<userinput>&COMMANDNAME; --debug --pubkey keydir/pubkey.txt --seckey keydir/seckey.txt --connect fe80::aede:48ff:fe71:f6f2:4711 --interface eth2</userinput>
 
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>
709
424
 
710
425
      </para>
711
426
    </informalexample>
761
476
  <refsect1 id="see_also">
762
477
    <title>SEE ALSO</title>
763
478
    <para>
764
 
      <citerefentry><refentrytitle>intro</refentrytitle>
765
 
      <manvolnum>8mandos</manvolnum></citerefentry>,
766
479
      <citerefentry><refentrytitle>cryptsetup</refentrytitle>
767
480
      <manvolnum>8</manvolnum></citerefentry>,
768
481
      <citerefentry><refentrytitle>crypttab</refentrytitle>