/mandos/trunk

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  • Committer: Teddy Hogeborn
  • Date: 2008-09-01 16:19:32 UTC
  • Revision ID: teddy@fukt.bsnet.se-20080901161932-ostp7tulh9aijulh
* plugin-runner.c (add_environment): Never insert existing environment
                                     variables.
  (main): Rename "--global-envs" to "--global-env" and "--envs-for" to
          "--env-for".

* plugin-runner.xml (SYNOPSIS): Rename "--global-envs" to
                                "--global-env" and "--envs-for" to
                                "--env-for".
  (OPTIONS): Added "--global-env" and "--env-for".
  (FALLBACK): Add id attribute.
  (EXIT STATUS): Add text.
  (ENVIRONMENT): New section.
  (FILES): Document configuration file.

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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 "2011-10-05">
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<!ENTITY % common SYSTEM "common.ent">
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%common;
 
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<!ENTITY TIMESTAMP "2008-09-01">
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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@recompile.se</email>
 
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          <email>belorn@fukt.bsnet.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@recompile.se</email>
 
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          <email>teddy@fukt.bsnet.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>
36
 
      <year>2011</year>
37
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      <holder>Teddy Hogeborn</holder>
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      <holder>Björn Påhlsson</holder>
39
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    </copyright>
40
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    <xi:include href="legalnotice.xml"/>
41
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  </refentryinfo>
42
 
  
 
39
 
43
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  <refmeta>
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    <refentrytitle>&COMMANDNAME;</refentrytitle>
45
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    <manvolnum>8mandos</manvolnum>
48
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  <refnamediv>
49
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    <refname><command>&COMMANDNAME;</command></refname>
50
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    <refpurpose>
51
 
      Run Mandos plugins, pass data from first to succeed.
 
48
      Run Mandos plugins.  Pass data from first succesful one.
52
49
    </refpurpose>
53
50
  </refnamediv>
54
 
  
 
51
 
55
52
  <refsynopsisdiv>
56
53
    <cmdsynopsis>
57
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      <command>&COMMANDNAME;</command>
58
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      <group rep="repeat">
59
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        <arg choice="plain"><option>--global-env=<replaceable
60
 
        >ENV</replaceable><literal>=</literal><replaceable
 
57
        >VAR</replaceable><literal>=</literal><replaceable
61
58
        >value</replaceable></option></arg>
62
 
        <arg choice="plain"><option>-G
63
 
        <replaceable>ENV</replaceable><literal>=</literal><replaceable
 
59
        <arg choice="plain"><option>-e
 
60
        <replaceable>VAR</replaceable><literal>=</literal><replaceable
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        >value</replaceable> </option></arg>
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      </group>
66
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      <sbr/>
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        >PLUGIN</replaceable><literal>:</literal><replaceable
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        >ENV</replaceable><literal>=</literal><replaceable
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        >value</replaceable></option></arg>
72
 
        <arg choice="plain"><option>-E<replaceable>
 
69
        <arg choice="plain"><option>-f<replaceable>
73
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        PLUGIN</replaceable><literal>:</literal><replaceable
74
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        >ENV</replaceable><literal>=</literal><replaceable
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        >value</replaceable> </option></arg>
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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>
89
 
        <arg choice="plain"><option>-o<replaceable>
 
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        <arg choice="plain"><option>-f<replaceable>
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        PLUGIN</replaceable><literal>:</literal><replaceable
91
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        >OPTIONS</replaceable> </option></arg>
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      </group>
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        <replaceable>PLUGIN</replaceable> </option></arg>
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      </group>
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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/>
120
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      <arg><option>--debug</option></arg>
121
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    </cmdsynopsis>
122
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    <cmdsynopsis>
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    <title>DESCRIPTION</title>
144
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    <para>
145
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      <command>&COMMANDNAME;</command> is a program which is meant to
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.
 
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.
153
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    </para>
154
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    <para>
155
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      This program is not meant to be invoked directly, but can be in
173
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    <variablelist>
174
161
      <varlistentry>
175
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        <term><option>--global-env
176
 
        <replaceable>ENV</replaceable><literal>=</literal><replaceable
 
163
        <replaceable>VAR</replaceable><literal>=</literal><replaceable
177
164
        >value</replaceable></option></term>
178
 
        <term><option>-G
179
 
        <replaceable>ENV</replaceable><literal>=</literal><replaceable
 
165
        <term><option>-e
 
166
        <replaceable>VAR</replaceable><literal>=</literal><replaceable
180
167
        >value</replaceable></option></term>
181
168
        <listitem>
182
169
          <para>
183
 
            This option will add an environment variable setting to
184
 
            all plugins.  This will override any inherited environment
185
 
            variable.
 
170
            
186
171
          </para>
187
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        </listitem>
188
173
      </varlistentry>
192
177
        <replaceable>PLUGIN</replaceable><literal>:</literal
193
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        ><replaceable>ENV</replaceable><literal>=</literal
194
179
        ><replaceable>value</replaceable></option></term>
195
 
        <term><option>-E
 
180
        <term><option>-f
196
181
        <replaceable>PLUGIN</replaceable><literal>:</literal
197
182
        ><replaceable>ENV</replaceable><literal>=</literal
198
183
        ><replaceable>value</replaceable></option></term>
199
184
        <listitem>
200
185
          <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>.
206
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          </para>
207
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        </listitem>
208
188
      </varlistentry>
218
198
            <replaceable>OPTIONS</replaceable> is a comma separated
219
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            list of options.  This is not a very useful option, except
220
200
            for specifying the <quote><option>--debug</option></quote>
221
 
            option to all plugins.
 
201
            for all plugins.
222
202
          </para>
223
203
        </listitem>
224
204
      </varlistentry>
244
224
            <option>--bar</option> with the option argument
245
225
            <quote>baz</quote> is either
246
226
            <userinput>--options-for=foo:--bar=baz</userinput> or
247
 
            <userinput>--options-for=foo:--bar,baz</userinput>.  Using
248
 
            <userinput>--options-for="foo:--bar baz"</userinput>. will
249
 
            <emphasis>not</emphasis> work.
 
227
            <userinput>--options-for=foo:--bar,baz</userinput>, but
 
228
            <emphasis>not</emphasis>
 
229
            <userinput>--options-for="foo:--bar baz"</userinput>.
250
230
          </para>
251
231
        </listitem>
252
232
      </varlistentry>
253
 
      
 
233
 
254
234
      <varlistentry>
255
 
        <term><option>--disable
 
235
        <term><option> --disable
256
236
        <replaceable>PLUGIN</replaceable></option></term>
257
237
        <term><option>-d
258
238
        <replaceable>PLUGIN</replaceable></option></term>
261
241
            Disable the plugin named
262
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            <replaceable>PLUGIN</replaceable>.  The plugin will not be
263
243
            started.
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
 
      
 
244
          </para>       
 
245
        </listitem>
 
246
      </varlistentry>
 
247
 
283
248
      <varlistentry>
284
249
        <term><option>--groupid
285
250
        <replaceable>ID</replaceable></option></term>
292
257
          </para>
293
258
        </listitem>
294
259
      </varlistentry>
295
 
      
 
260
 
296
261
      <varlistentry>
297
262
        <term><option>--userid
298
263
        <replaceable>ID</replaceable></option></term>
305
270
          </para>
306
271
        </listitem>
307
272
      </varlistentry>
308
 
      
 
273
 
309
274
      <varlistentry>
310
275
        <term><option>--plugin-dir
311
276
        <replaceable>DIRECTORY</replaceable></option></term>
320
285
      </varlistentry>
321
286
      
322
287
      <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>
335
288
        <term><option>--debug</option></term>
336
289
        <listitem>
337
290
          <para>
368
321
          </para>
369
322
        </listitem>
370
323
      </varlistentry>
371
 
      
 
324
 
372
325
      <varlistentry>
373
326
        <term><option>--version</option></term>
374
327
        <term><option>-V</option></term>
380
333
      </varlistentry>
381
334
    </variablelist>
382
335
  </refsect1>
383
 
  
 
336
 
384
337
  <refsect1 id="overview">
385
338
    <title>OVERVIEW</title>
386
339
    <xi:include href="overview.xml"/>
406
359
      code will make this plugin-runner output the password from that
407
360
      plugin, stop any other plugins, and exit.
408
361
    </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>
447
362
  </refsect1>
448
363
  
449
364
  <refsect1 id="fallback">
471
386
  <refsect1 id="environment">
472
387
    <title>ENVIRONMENT</title>
473
388
    <para>
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.
 
389
      
479
390
    </para>
480
391
  </refsect1>
481
392
  
482
 
  <refsect1 id="files">
 
393
  <refsect1 id="file">
483
394
    <title>FILES</title>
484
395
    <para>
485
396
      <variablelist>
496
407
              everything from a <quote>#</quote> character to the end
497
408
              of a line is ignored.
498
409
            </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>
515
410
          </listitem>
516
411
        </varlistentry>
517
412
      </variablelist>
521
416
  <refsect1 id="bugs">
522
417
    <title>BUGS</title>
523
418
    <para>
524
 
      The <option>--config-file</option> option is ignored when
525
 
      specified from within a configuration file.
526
419
    </para>
527
420
  </refsect1>
528
421
  
529
422
  <refsect1 id="examples">
530
423
    <title>EXAMPLE</title>
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>
 
424
    <para>
 
425
    </para>
587
426
  </refsect1>
 
427
  
588
428
  <refsect1 id="security">
589
429
    <title>SECURITY</title>
590
430
    <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"/>).
615
431
    </para>
616
432
  </refsect1>
617
433
  
618
434
  <refsect1 id="see_also">
619
435
    <title>SEE ALSO</title>
620
436
    <para>
621
 
      <citerefentry><refentrytitle>intro</refentrytitle>
622
 
      <manvolnum>8mandos</manvolnum></citerefentry>,
623
437
      <citerefentry><refentrytitle>cryptsetup</refentrytitle>
624
438
      <manvolnum>8</manvolnum></citerefentry>,
625
 
      <citerefentry><refentrytitle>crypttab</refentrytitle>
626
 
      <manvolnum>5</manvolnum></citerefentry>,
627
 
      <citerefentry><refentrytitle>execve</refentrytitle>
628
 
      <manvolnum>2</manvolnum></citerefentry>,
629
439
      <citerefentry><refentrytitle>mandos</refentrytitle>
630
440
      <manvolnum>8</manvolnum></citerefentry>,
631
441
      <citerefentry><refentrytitle>password-prompt</refentrytitle>
632
442
      <manvolnum>8mandos</manvolnum></citerefentry>,
633
 
      <citerefentry><refentrytitle>mandos-client</refentrytitle>
 
443
      <citerefentry><refentrytitle>password-request</refentrytitle>
634
444
      <manvolnum>8mandos</manvolnum></citerefentry>
635
445
    </para>
636
446
  </refsect1>