/mandos/trunk

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  • Committer: Teddy Hogeborn
  • Date: 2012-05-12 19:29:05 UTC
  • Revision ID: teddy@recompile.se-20120512192905-8icx7a55j0o7o70n
* mandos (Client.runtime_expansions): Add "expires" and (bug fix)
                                      "last_approval_request".
  (main): Don't ignore SIGINT.
* mandos-clients.conf.xml (RUNTIME EXPANSION): Added "expires".

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plugin-runner.xml
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<?xml version="1.0" encoding="UTF-8"?>
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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 VERSION "1.0">
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<!ENTITY COMMANDNAME "plugin-runner">
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<!ENTITY TIMESTAMP "2008-09-01">
 
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<!ENTITY TIMESTAMP "2012-01-01">
 
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<!ENTITY % common SYSTEM "common.ent">
 
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%common;
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]>
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<refentry xmlns:xi="http://www.w3.org/2001/XInclude">
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    <title>Mandos Manual</title>
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    <!-- Nwalsh’s docbook scripts use this to generate the footer: -->
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    <productname>Mandos</productname>
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    <productnumber>&VERSION;</productnumber>
 
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    <productnumber>&version;</productnumber>
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    <date>&TIMESTAMP;</date>
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    <authorgroup>
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      <author>
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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>
32
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    <copyright>
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      <year>2008</year>
 
35
      <year>2009</year>
 
36
      <year>2012</year>
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      <holder>Teddy Hogeborn</holder>
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      <holder>Björn Påhlsson</holder>
36
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    </copyright>
37
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    <xi:include href="legalnotice.xml"/>
38
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  </refentryinfo>
39
 
 
 
42
  
40
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  <refmeta>
41
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    <refentrytitle>&COMMANDNAME;</refentrytitle>
42
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    <manvolnum>8mandos</manvolnum>
45
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  <refnamediv>
46
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    <refname><command>&COMMANDNAME;</command></refname>
47
50
    <refpurpose>
48
 
      Run Mandos plugins.  Pass data from first succesful one.
 
51
      Run Mandos plugins, pass data from first to succeed.
49
52
    </refpurpose>
50
53
  </refnamediv>
51
 
 
 
54
  
52
55
  <refsynopsisdiv>
53
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    <cmdsynopsis>
54
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      <command>&COMMANDNAME;</command>
55
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      <group rep="repeat">
56
59
        <arg choice="plain"><option>--global-env=<replaceable
57
 
        >VAR</replaceable><literal>=</literal><replaceable
 
60
        >ENV</replaceable><literal>=</literal><replaceable
58
61
        >value</replaceable></option></arg>
59
 
        <arg choice="plain"><option>-e
60
 
        <replaceable>VAR</replaceable><literal>=</literal><replaceable
 
62
        <arg choice="plain"><option>-G
 
63
        <replaceable>ENV</replaceable><literal>=</literal><replaceable
61
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        >value</replaceable> </option></arg>
62
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      </group>
63
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      <sbr/>
66
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        >PLUGIN</replaceable><literal>:</literal><replaceable
67
70
        >ENV</replaceable><literal>=</literal><replaceable
68
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        >value</replaceable></option></arg>
69
 
        <arg choice="plain"><option>-f<replaceable>
 
72
        <arg choice="plain"><option>-E<replaceable>
70
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        PLUGIN</replaceable><literal>:</literal><replaceable
71
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        >ENV</replaceable><literal>=</literal><replaceable
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        >value</replaceable> </option></arg>
83
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        <arg choice="plain"><option>--options-for=<replaceable
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        >PLUGIN</replaceable><literal>:</literal><replaceable
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        >OPTIONS</replaceable></option></arg>
86
 
        <arg choice="plain"><option>-f<replaceable>
 
89
        <arg choice="plain"><option>-o<replaceable>
87
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        PLUGIN</replaceable><literal>:</literal><replaceable
88
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        >OPTIONS</replaceable> </option></arg>
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      </group>
95
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        <replaceable>PLUGIN</replaceable> </option></arg>
96
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      </group>
97
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      <sbr/>
 
101
      <group rep="repeat">
 
102
        <arg choice="plain"><option>--enable=<replaceable
 
103
        >PLUGIN</replaceable></option></arg>
 
104
        <arg choice="plain"><option>-e
 
105
        <replaceable>PLUGIN</replaceable> </option></arg>
 
106
      </group>
 
107
      <sbr/>
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      <arg><option>--groupid=<replaceable
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      >ID</replaceable></option></arg>
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      <sbr/>
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      <arg><option>--plugin-dir=<replaceable
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      >DIRECTORY</replaceable></option></arg>
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      <sbr/>
 
117
      <arg><option>--config-file=<replaceable
 
118
      >FILE</replaceable></option></arg>
 
119
      <sbr/>
107
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      <arg><option>--debug</option></arg>
108
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    </cmdsynopsis>
109
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    <cmdsynopsis>
130
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    <title>DESCRIPTION</title>
131
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    <para>
132
145
      <command>&COMMANDNAME;</command> is a program which is meant to
133
 
      be specified as <quote>keyscript</quote> in <citerefentry>
134
 
      <refentrytitle>crypttab</refentrytitle>
135
 
      <manvolnum>5</manvolnum></citerefentry> for the root disk.  The
136
 
      aim of this program is therefore to output a password, which
137
 
      then <citerefentry><refentrytitle>cryptsetup</refentrytitle>
138
 
      <manvolnum>8</manvolnum></citerefentry> will use to try and
139
 
      unlock the root disk.
 
146
      be specified as a <quote>keyscript</quote> for the root disk in
 
147
      <citerefentry><refentrytitle>crypttab</refentrytitle>
 
148
      <manvolnum>5</manvolnum></citerefentry>.  The aim of this
 
149
      program is therefore to output a password, which then
 
150
      <citerefentry><refentrytitle>cryptsetup</refentrytitle>
 
151
      <manvolnum>8</manvolnum></citerefentry> will use to unlock the
 
152
      root disk.
140
153
    </para>
141
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    <para>
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      This program is not meant to be invoked directly, but can be in
160
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    <variablelist>
161
174
      <varlistentry>
162
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        <term><option>--global-env
163
 
        <replaceable>VAR</replaceable><literal>=</literal><replaceable
 
176
        <replaceable>ENV</replaceable><literal>=</literal><replaceable
164
177
        >value</replaceable></option></term>
165
 
        <term><option>-e
166
 
        <replaceable>VAR</replaceable><literal>=</literal><replaceable
 
178
        <term><option>-G
 
179
        <replaceable>ENV</replaceable><literal>=</literal><replaceable
167
180
        >value</replaceable></option></term>
168
181
        <listitem>
169
182
          <para>
170
 
            
 
183
            This option will add an environment variable setting to
 
184
            all plugins.  This will override any inherited environment
 
185
            variable.
171
186
          </para>
172
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        </listitem>
173
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      </varlistentry>
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        <replaceable>PLUGIN</replaceable><literal>:</literal
178
193
        ><replaceable>ENV</replaceable><literal>=</literal
179
194
        ><replaceable>value</replaceable></option></term>
180
 
        <term><option>-f
 
195
        <term><option>-E
181
196
        <replaceable>PLUGIN</replaceable><literal>:</literal
182
197
        ><replaceable>ENV</replaceable><literal>=</literal
183
198
        ><replaceable>value</replaceable></option></term>
184
199
        <listitem>
185
200
          <para>
 
201
            This option will add an environment variable setting to
 
202
            the <replaceable>PLUGIN</replaceable> plugin.  This will
 
203
            override any inherited environment variables or
 
204
            environment variables specified using
 
205
            <option>--global-env</option>.
186
206
          </para>
187
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        </listitem>
188
208
      </varlistentry>
198
218
            <replaceable>OPTIONS</replaceable> is a comma separated
199
219
            list of options.  This is not a very useful option, except
200
220
            for specifying the <quote><option>--debug</option></quote>
201
 
            for all plugins.
 
221
            option to all plugins.
202
222
          </para>
203
223
        </listitem>
204
224
      </varlistentry>
224
244
            <option>--bar</option> with the option argument
225
245
            <quote>baz</quote> is either
226
246
            <userinput>--options-for=foo:--bar=baz</userinput> or
227
 
            <userinput>--options-for=foo:--bar,baz</userinput>, but
228
 
            <emphasis>not</emphasis>
229
 
            <userinput>--options-for="foo:--bar baz"</userinput>.
 
247
            <userinput>--options-for=foo:--bar,baz</userinput>.  Using
 
248
            <userinput>--options-for="foo:--bar baz"</userinput>. will
 
249
            <emphasis>not</emphasis> work.
230
250
          </para>
231
251
        </listitem>
232
252
      </varlistentry>
233
 
 
 
253
      
234
254
      <varlistentry>
235
 
        <term><option> --disable
 
255
        <term><option>--disable
236
256
        <replaceable>PLUGIN</replaceable></option></term>
237
257
        <term><option>-d
238
258
        <replaceable>PLUGIN</replaceable></option></term>
241
261
            Disable the plugin named
242
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            <replaceable>PLUGIN</replaceable>.  The plugin will not be
243
263
            started.
244
 
          </para>       
245
 
        </listitem>
246
 
      </varlistentry>
247
 
 
 
264
          </para>
 
265
        </listitem>
 
266
      </varlistentry>
 
267
      
 
268
      <varlistentry>
 
269
        <term><option>--enable
 
270
        <replaceable>PLUGIN</replaceable></option></term>
 
271
        <term><option>-e
 
272
        <replaceable>PLUGIN</replaceable></option></term>
 
273
        <listitem>
 
274
          <para>
 
275
            Re-enable the plugin named
 
276
            <replaceable>PLUGIN</replaceable>.  This is only useful to
 
277
            undo a previous <option>--disable</option> option, maybe
 
278
            from the configuration file.
 
279
          </para>
 
280
        </listitem>
 
281
      </varlistentry>
 
282
      
248
283
      <varlistentry>
249
284
        <term><option>--groupid
250
285
        <replaceable>ID</replaceable></option></term>
257
292
          </para>
258
293
        </listitem>
259
294
      </varlistentry>
260
 
 
 
295
      
261
296
      <varlistentry>
262
297
        <term><option>--userid
263
298
        <replaceable>ID</replaceable></option></term>
270
305
          </para>
271
306
        </listitem>
272
307
      </varlistentry>
273
 
 
 
308
      
274
309
      <varlistentry>
275
310
        <term><option>--plugin-dir
276
311
        <replaceable>DIRECTORY</replaceable></option></term>
285
320
      </varlistentry>
286
321
      
287
322
      <varlistentry>
 
323
        <term><option>--config-file
 
324
        <replaceable>FILE</replaceable></option></term>
 
325
        <listitem>
 
326
          <para>
 
327
            Specify a different file to read additional options from.
 
328
            See <xref linkend="files"/>.  Other command line options
 
329
            will override options specified in the file.
 
330
          </para>
 
331
        </listitem>
 
332
      </varlistentry>
 
333
      
 
334
      <varlistentry>
288
335
        <term><option>--debug</option></term>
289
336
        <listitem>
290
337
          <para>
321
368
          </para>
322
369
        </listitem>
323
370
      </varlistentry>
324
 
 
 
371
      
325
372
      <varlistentry>
326
373
        <term><option>--version</option></term>
327
374
        <term><option>-V</option></term>
333
380
      </varlistentry>
334
381
    </variablelist>
335
382
  </refsect1>
336
 
 
 
383
  
337
384
  <refsect1 id="overview">
338
385
    <title>OVERVIEW</title>
339
386
    <xi:include href="overview.xml"/>
359
406
      code will make this plugin-runner output the password from that
360
407
      plugin, stop any other plugins, and exit.
361
408
    </para>
 
409
    
 
410
    <refsect2 id="writing_plugins">
 
411
      <title>WRITING PLUGINS</title>
 
412
      <para>
 
413
        A plugin is simply a program which prints a password to its
 
414
        standard output and then exits with a successful (zero) exit
 
415
        status.  If the exit status is not zero, any output on
 
416
        standard output will be ignored by the plugin runner.  Any
 
417
        output on its standard error channel will simply be passed to
 
418
        the standard error of the plugin runner, usually the system
 
419
        console.
 
420
      </para>
 
421
      <para>
 
422
        If the password is a single-line, manually entered passprase,
 
423
        a final trailing newline character should
 
424
        <emphasis>not</emphasis> be printed.
 
425
      </para>
 
426
      <para>
 
427
        The plugin will run in the initial RAM disk environment, so
 
428
        care must be taken not to depend on any files or running
 
429
        services not available there.
 
430
      </para>
 
431
      <para>
 
432
        The plugin must exit cleanly and free all allocated resources
 
433
        upon getting the TERM signal, since this is what the plugin
 
434
        runner uses to stop all other plugins when one plugin has
 
435
        output a password and exited cleanly.
 
436
      </para>
 
437
      <para>
 
438
        The plugin must not use resources, like for instance reading
 
439
        from the standard input, without knowing that no other plugin
 
440
        is also using it.
 
441
      </para>
 
442
      <para>
 
443
        It is useful, but not required, for the plugin to take the
 
444
        <option>--debug</option> option.
 
445
      </para>
 
446
    </refsect2>
362
447
  </refsect1>
363
448
  
364
449
  <refsect1 id="fallback">
386
471
  <refsect1 id="environment">
387
472
    <title>ENVIRONMENT</title>
388
473
    <para>
389
 
      
 
474
      This program does not use any environment variables itself, it
 
475
      only passes on its environment to all the plugins.  The
 
476
      environment passed to plugins can be modified using the
 
477
      <option>--global-env</option> and <option>--env-for</option>
 
478
      options.
390
479
    </para>
391
480
  </refsect1>
392
481
  
393
 
  <refsect1 id="file">
 
482
  <refsect1 id="files">
394
483
    <title>FILES</title>
395
484
    <para>
396
485
      <variablelist>
407
496
              everything from a <quote>#</quote> character to the end
408
497
              of a line is ignored.
409
498
            </para>
 
499
            <para>
 
500
              This program is meant to run in the initial RAM disk
 
501
              environment, so that is where this file is assumed to
 
502
              exist.  The file does not need to exist in the normal
 
503
              file system.
 
504
            </para>
 
505
            <para>
 
506
              This file will be processed <emphasis>before</emphasis>
 
507
              the normal command line options, so the latter can
 
508
              override the former, if need be.
 
509
            </para>
 
510
            <para>
 
511
              This file name is the default; the file to read for
 
512
              arguments can be changed using the
 
513
              <option>--config-file</option> option.
 
514
            </para>
410
515
          </listitem>
411
516
        </varlistentry>
412
517
      </variablelist>
416
521
  <refsect1 id="bugs">
417
522
    <title>BUGS</title>
418
523
    <para>
 
524
      The <option>--config-file</option> option is ignored when
 
525
      specified from within a configuration file.
419
526
    </para>
420
527
  </refsect1>
421
528
  
422
529
  <refsect1 id="examples">
423
530
    <title>EXAMPLE</title>
424
 
    <para>
425
 
    </para>
 
531
    <informalexample>
 
532
      <para>
 
533
        Normal invocation needs no options:
 
534
      </para>
 
535
      <para>
 
536
        <userinput>&COMMANDNAME;</userinput>
 
537
      </para>
 
538
    </informalexample>
 
539
    <informalexample>
 
540
      <para>
 
541
        Run the program, but not the plugins, in debug mode:
 
542
      </para>
 
543
      <para>
 
544
        
 
545
        <!-- do not wrap this line -->
 
546
        <userinput>&COMMANDNAME; --debug</userinput>
 
547
        
 
548
      </para>
 
549
    </informalexample>
 
550
    <informalexample>
 
551
      <para>
 
552
        Run all plugins, but run the <quote>foo</quote> plugin in
 
553
        debug mode:
 
554
      </para>
 
555
      <para>
 
556
        
 
557
        <!-- do not wrap this line -->
 
558
        <userinput>&COMMANDNAME; --options-for=foo:--debug</userinput>
 
559
        
 
560
      </para>
 
561
    </informalexample>
 
562
    <informalexample>
 
563
      <para>
 
564
        Run all plugins, but not the program, in debug mode:
 
565
      </para>
 
566
      <para>
 
567
        
 
568
        <!-- do not wrap this line -->
 
569
        <userinput>&COMMANDNAME; --global-options=--debug</userinput>
 
570
        
 
571
      </para>
 
572
    </informalexample>
 
573
    <informalexample>
 
574
      <para>
 
575
        Run plugins from a different directory, read a different
 
576
        configuration file, and add two options to the
 
577
        <citerefentry><refentrytitle >mandos-client</refentrytitle>
 
578
        <manvolnum>8mandos</manvolnum></citerefentry> plugin:
 
579
      </para>
 
580
      <para>
 
581
 
 
582
<!-- do not wrap this line -->
 
583
<userinput>cd /etc/keys/mandos; &COMMANDNAME;  --config-file=/etc/mandos/plugin-runner.conf --plugin-dir /usr/lib/mandos/plugins.d --options-for=mandos-client:--pubkey=pubkey.txt,--seckey=seckey.txt</userinput>
 
584
 
 
585
      </para>
 
586
    </informalexample>
426
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  </refsect1>
427
 
  
428
588
  <refsect1 id="security">
429
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    <title>SECURITY</title>
430
590
    <para>
 
591
      This program will, when starting, try to switch to another user.
 
592
      If it is started as root, it will succeed, and will by default
 
593
      switch to user and group 65534, which are assumed to be
 
594
      non-privileged.  This user and group is then what all plugins
 
595
      will be started as.  Therefore, the only way to run a plugin as
 
596
      a privileged user is to have the set-user-ID or set-group-ID bit
 
597
      set on the plugin executable file (see <citerefentry>
 
598
      <refentrytitle>execve</refentrytitle><manvolnum>2</manvolnum>
 
599
      </citerefentry>).
 
600
    </para>
 
601
    <para>
 
602
      If this program is used as a keyscript in <citerefentry
 
603
      ><refentrytitle>crypttab</refentrytitle><manvolnum>5</manvolnum>
 
604
      </citerefentry>, there is a slight risk that if this program
 
605
      fails to work, there might be no way to boot the system except
 
606
      for booting from another media and editing the initial RAM disk
 
607
      image to not run this program.  This is, however, unlikely,
 
608
      since the <citerefentry><refentrytitle
 
609
      >password-prompt</refentrytitle><manvolnum>8mandos</manvolnum>
 
610
      </citerefentry> plugin will read a password from the console in
 
611
      case of failure of the other plugins, and this plugin runner
 
612
      will also, in case of catastrophic failure, itself fall back to
 
613
      asking and outputting a password on the console (see <xref
 
614
      linkend="fallback"/>).
431
615
    </para>
432
616
  </refsect1>
433
617
  
434
618
  <refsect1 id="see_also">
435
619
    <title>SEE ALSO</title>
436
620
    <para>
 
621
      <citerefentry><refentrytitle>intro</refentrytitle>
 
622
      <manvolnum>8mandos</manvolnum></citerefentry>,
437
623
      <citerefentry><refentrytitle>cryptsetup</refentrytitle>
438
624
      <manvolnum>8</manvolnum></citerefentry>,
 
625
      <citerefentry><refentrytitle>crypttab</refentrytitle>
 
626
      <manvolnum>5</manvolnum></citerefentry>,
 
627
      <citerefentry><refentrytitle>execve</refentrytitle>
 
628
      <manvolnum>2</manvolnum></citerefentry>,
439
629
      <citerefentry><refentrytitle>mandos</refentrytitle>
440
630
      <manvolnum>8</manvolnum></citerefentry>,
441
631
      <citerefentry><refentrytitle>password-prompt</refentrytitle>
442
632
      <manvolnum>8mandos</manvolnum></citerefentry>,
443
 
      <citerefentry><refentrytitle>password-request</refentrytitle>
 
633
      <citerefentry><refentrytitle>mandos-client</refentrytitle>
444
634
      <manvolnum>8mandos</manvolnum></citerefentry>
445
635
    </para>
446
636
  </refsect1>