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  • Committer: Teddy Hogeborn
  • Date: 2018-08-19 01:35:11 UTC
  • mto: (237.7.594 trunk)
  • mto: This revision was merged to the branch mainline in revision 368.
  • Revision ID: teddy@recompile.se-20180819013511-cku25q9yeub3dnr0
Adapt to changes in cryptsetup; use "cryptroot-unlock" program

* Makefile (install-client-nokey): Also install new script files
  "mandos-to-cryptroot-unlock" and "initramfs-tools-script-stop".
* debian/mandos-client.dirs: Add
  "usr/share/initramfs-tools/scripts/local-premount".
* initramfs-tools-hook: Also copy "mandos-to-cryptroot-unlock".
* initramfs-tools-script: Only modify keyscript setting in cryptroot
  file if the file exists, otherwise start
  "mandos-to-cryptroot-unlock" in background.
* initramfs-tools-script-stop: New script to make sure plugin-runner
  has stopped before continuing.
* mandos-to-cryptroot-unlock: New script to run plugin-runner and feed
  any password it gets into the "cryptroot-unlock" program.

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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 "2018-02-08">
 
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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>
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    <copyright>
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      <year>2008</year>
 
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      <year>2009</year>
 
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      <year>2010</year>
 
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      <year>2011</year>
 
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      <year>2012</year>
 
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      <year>2013</year>
 
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      <year>2014</year>
 
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      <year>2015</year>
 
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      <year>2016</year>
 
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      <year>2017</year>
 
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      <year>2018</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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    <xi:include href="legalnotice.xml"/>
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  </refentryinfo>
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  <refmeta>
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    <refentrytitle>&COMMANDNAME;</refentrytitle>
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    <manvolnum>8mandos</manvolnum>
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  <refnamediv>
46
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    <refname><command>&COMMANDNAME;</command></refname>
47
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    <refpurpose>
48
 
      Run Mandos plugins.  Pass data from first succesful one.
 
59
      Run Mandos plugins, pass data from first to succeed.
49
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    </refpurpose>
50
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  </refnamediv>
51
 
 
 
62
  
52
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  <refsynopsisdiv>
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    <cmdsynopsis>
54
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      <command>&COMMANDNAME;</command>
55
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      <group rep="repeat">
56
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        <arg choice="plain"><option>--global-env=<replaceable
57
 
        >VAR</replaceable><literal>=</literal><replaceable
 
68
        >ENV</replaceable><literal>=</literal><replaceable
58
69
        >value</replaceable></option></arg>
59
 
        <arg choice="plain"><option>-e
60
 
        <replaceable>VAR</replaceable><literal>=</literal><replaceable
 
70
        <arg choice="plain"><option>-G
 
71
        <replaceable>ENV</replaceable><literal>=</literal><replaceable
61
72
        >value</replaceable> </option></arg>
62
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      </group>
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      <sbr/>
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        >PLUGIN</replaceable><literal>:</literal><replaceable
67
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        >ENV</replaceable><literal>=</literal><replaceable
68
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        >value</replaceable></option></arg>
69
 
        <arg choice="plain"><option>-f<replaceable>
 
80
        <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
72
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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
85
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        >OPTIONS</replaceable></option></arg>
86
 
        <arg choice="plain"><option>-f<replaceable>
 
97
        <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>
89
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      </group>
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        <replaceable>PLUGIN</replaceable> </option></arg>
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      </group>
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      <sbr/>
 
109
      <group rep="repeat">
 
110
        <arg choice="plain"><option>--enable=<replaceable
 
111
        >PLUGIN</replaceable></option></arg>
 
112
        <arg choice="plain"><option>-e
 
113
        <replaceable>PLUGIN</replaceable> </option></arg>
 
114
      </group>
 
115
      <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/>
 
125
      <arg><option>--plugin-helper-dir=<replaceable
 
126
      >DIRECTORY</replaceable></option></arg>
 
127
      <sbr/>
 
128
      <arg><option>--config-file=<replaceable
 
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      >FILE</replaceable></option></arg>
 
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      <sbr/>
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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>
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      <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.
 
157
      be specified as a <quote>keyscript</quote> for the root disk in
 
158
      <citerefentry><refentrytitle>crypttab</refentrytitle>
 
159
      <manvolnum>5</manvolnum></citerefentry>.  The aim of this
 
160
      program is therefore to output a password, which then
 
161
      <citerefentry><refentrytitle>cryptsetup</refentrytitle>
 
162
      <manvolnum>8</manvolnum></citerefentry> will use to unlock the
 
163
      root disk.
140
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    </para>
141
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    <para>
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      This program is not meant to be invoked directly, but can be in
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    <variablelist>
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      <varlistentry>
162
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        <term><option>--global-env
163
 
        <replaceable>VAR</replaceable><literal>=</literal><replaceable
 
187
        <replaceable>ENV</replaceable><literal>=</literal><replaceable
164
188
        >value</replaceable></option></term>
165
 
        <term><option>-e
166
 
        <replaceable>VAR</replaceable><literal>=</literal><replaceable
 
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        <term><option>-G
 
190
        <replaceable>ENV</replaceable><literal>=</literal><replaceable
167
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        >value</replaceable></option></term>
168
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        <listitem>
169
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          <para>
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        <replaceable>PLUGIN</replaceable><literal>:</literal
180
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        ><replaceable>ENV</replaceable><literal>=</literal
181
205
        ><replaceable>value</replaceable></option></term>
182
 
        <term><option>-f
 
206
        <term><option>-E
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        <replaceable>PLUGIN</replaceable><literal>:</literal
184
208
        ><replaceable>ENV</replaceable><literal>=</literal
185
209
        ><replaceable>value</replaceable></option></term>
205
229
            <replaceable>OPTIONS</replaceable> is a comma separated
206
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            list of options.  This is not a very useful option, except
207
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            for specifying the <quote><option>--debug</option></quote>
208
 
            for all plugins.
 
232
            option to all plugins.
209
233
          </para>
210
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        </listitem>
211
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      </varlistentry>
231
255
            <option>--bar</option> with the option argument
232
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            <quote>baz</quote> is either
233
257
            <userinput>--options-for=foo:--bar=baz</userinput> or
234
 
            <userinput>--options-for=foo:--bar,baz</userinput>, but
235
 
            <emphasis>not</emphasis>
236
 
            <userinput>--options-for="foo:--bar baz"</userinput>.
 
258
            <userinput>--options-for=foo:--bar,baz</userinput>.  Using
 
259
            <userinput>--options-for="foo:--bar baz"</userinput>. will
 
260
            <emphasis>not</emphasis> work.
237
261
          </para>
238
262
        </listitem>
239
263
      </varlistentry>
240
 
 
 
264
      
241
265
      <varlistentry>
242
 
        <term><option> --disable
 
266
        <term><option>--disable
243
267
        <replaceable>PLUGIN</replaceable></option></term>
244
268
        <term><option>-d
245
269
        <replaceable>PLUGIN</replaceable></option></term>
248
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            Disable the plugin named
249
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            <replaceable>PLUGIN</replaceable>.  The plugin will not be
250
274
            started.
251
 
          </para>       
252
 
        </listitem>
253
 
      </varlistentry>
254
 
 
 
275
          </para>
 
276
        </listitem>
 
277
      </varlistentry>
 
278
      
 
279
      <varlistentry>
 
280
        <term><option>--enable
 
281
        <replaceable>PLUGIN</replaceable></option></term>
 
282
        <term><option>-e
 
283
        <replaceable>PLUGIN</replaceable></option></term>
 
284
        <listitem>
 
285
          <para>
 
286
            Re-enable the plugin named
 
287
            <replaceable>PLUGIN</replaceable>.  This is only useful to
 
288
            undo a previous <option>--disable</option> option, maybe
 
289
            from the configuration file.
 
290
          </para>
 
291
        </listitem>
 
292
      </varlistentry>
 
293
      
255
294
      <varlistentry>
256
295
        <term><option>--groupid
257
296
        <replaceable>ID</replaceable></option></term>
264
303
          </para>
265
304
        </listitem>
266
305
      </varlistentry>
267
 
 
 
306
      
268
307
      <varlistentry>
269
308
        <term><option>--userid
270
309
        <replaceable>ID</replaceable></option></term>
277
316
          </para>
278
317
        </listitem>
279
318
      </varlistentry>
280
 
 
 
319
      
281
320
      <varlistentry>
282
321
        <term><option>--plugin-dir
283
322
        <replaceable>DIRECTORY</replaceable></option></term>
292
331
      </varlistentry>
293
332
      
294
333
      <varlistentry>
 
334
        <term><option>--plugin-helper-dir
 
335
        <replaceable>DIRECTORY</replaceable></option></term>
 
336
        <listitem>
 
337
          <para>
 
338
            Specify a different plugin helper directory.  The default
 
339
            is <filename>/lib/mandos/plugin-helpers</filename>, which
 
340
            will exist in the initial <acronym>RAM</acronym> disk
 
341
            environment.  (This will simply be passed to all plugins
 
342
            via the <envar>MANDOSPLUGINHELPERDIR</envar> environment
 
343
            variable.  See <xref linkend="writing_plugins"/>)
 
344
          </para>
 
345
        </listitem>
 
346
      </varlistentry>
 
347
      
 
348
      <varlistentry>
 
349
        <term><option>--config-file
 
350
        <replaceable>FILE</replaceable></option></term>
 
351
        <listitem>
 
352
          <para>
 
353
            Specify a different file to read additional options from.
 
354
            See <xref linkend="files"/>.  Other command line options
 
355
            will override options specified in the file.
 
356
          </para>
 
357
        </listitem>
 
358
      </varlistentry>
 
359
      
 
360
      <varlistentry>
295
361
        <term><option>--debug</option></term>
296
362
        <listitem>
297
363
          <para>
328
394
          </para>
329
395
        </listitem>
330
396
      </varlistentry>
331
 
 
 
397
      
332
398
      <varlistentry>
333
399
        <term><option>--version</option></term>
334
400
        <term><option>-V</option></term>
340
406
      </varlistentry>
341
407
    </variablelist>
342
408
  </refsect1>
343
 
 
 
409
  
344
410
  <refsect1 id="overview">
345
411
    <title>OVERVIEW</title>
346
412
    <xi:include href="overview.xml"/>
366
432
      code will make this plugin-runner output the password from that
367
433
      plugin, stop any other plugins, and exit.
368
434
    </para>
 
435
    
 
436
    <refsect2 id="writing_plugins">
 
437
      <title>WRITING PLUGINS</title>
 
438
      <para>
 
439
        A plugin is simply a program which prints a password to its
 
440
        standard output and then exits with a successful (zero) exit
 
441
        status.  If the exit status is not zero, any output on
 
442
        standard output will be ignored by the plugin runner.  Any
 
443
        output on its standard error channel will simply be passed to
 
444
        the standard error of the plugin runner, usually the system
 
445
        console.
 
446
      </para>
 
447
      <para>
 
448
        If the password is a single-line, manually entered passprase,
 
449
        a final trailing newline character should
 
450
        <emphasis>not</emphasis> be printed.
 
451
      </para>
 
452
      <para>
 
453
        The plugin will run in the initial RAM disk environment, so
 
454
        care must be taken not to depend on any files or running
 
455
        services not available there.  Any helper executables required
 
456
        by the plugin (which are not in the <envar>PATH</envar>) can
 
457
        be placed in the plugin helper directory, the name of which
 
458
        will be made available to the plugin via the
 
459
        <envar>MANDOSPLUGINHELPERDIR</envar> environment variable.
 
460
      </para>
 
461
      <para>
 
462
        The plugin must exit cleanly and free all allocated resources
 
463
        upon getting the TERM signal, since this is what the plugin
 
464
        runner uses to stop all other plugins when one plugin has
 
465
        output a password and exited cleanly.
 
466
      </para>
 
467
      <para>
 
468
        The plugin must not use resources, like for instance reading
 
469
        from the standard input, without knowing that no other plugin
 
470
        is also using it.
 
471
      </para>
 
472
      <para>
 
473
        It is useful, but not required, for the plugin to take the
 
474
        <option>--debug</option> option.
 
475
      </para>
 
476
    </refsect2>
369
477
  </refsect1>
370
478
  
371
479
  <refsect1 id="fallback">
393
501
  <refsect1 id="environment">
394
502
    <title>ENVIRONMENT</title>
395
503
    <para>
396
 
      
 
504
      This program does not use any environment variables itself, it
 
505
      only passes on its environment to all the plugins.  The
 
506
      environment passed to plugins can be modified using the
 
507
      <option>--global-env</option> and <option>--env-for</option>
 
508
      options.  Also, the <option>--plugin-helper-dir</option> option
 
509
      will affect the environment variable
 
510
      <envar>MANDOSPLUGINHELPERDIR</envar> for the plugins.
397
511
    </para>
398
512
  </refsect1>
399
513
  
400
 
  <refsect1 id="file">
 
514
  <refsect1 id="files">
401
515
    <title>FILES</title>
402
516
    <para>
403
517
      <variablelist>
415
529
              of a line is ignored.
416
530
            </para>
417
531
            <para>
 
532
              This program is meant to run in the initial RAM disk
 
533
              environment, so that is where this file is assumed to
 
534
              exist.  The file does not need to exist in the normal
 
535
              file system.
 
536
            </para>
 
537
            <para>
418
538
              This file will be processed <emphasis>before</emphasis>
419
539
              the normal command line options, so the latter can
420
540
              override the former, if need be.
421
541
            </para>
 
542
            <para>
 
543
              This file name is the default; the file to read for
 
544
              arguments can be changed using the
 
545
              <option>--config-file</option> option.
 
546
            </para>
 
547
          </listitem>
 
548
        </varlistentry>
 
549
        <varlistentry>
 
550
          <term><filename class="directory"
 
551
          >/lib/mandos/plugins.d</filename></term>
 
552
          <listitem>
 
553
            <para>
 
554
              The default plugin directory; can be changed by the
 
555
              <option>--plugin-dir</option> option.
 
556
            </para>
 
557
          </listitem>
 
558
        </varlistentry>
 
559
        <varlistentry>
 
560
          <term><filename class="directory"
 
561
          >/lib/mandos/plugin-helpers</filename></term>
 
562
          <listitem>
 
563
            <para>
 
564
              The default plugin helper directory; can be changed by
 
565
              the <option>--plugin-helper-dir</option> option.
 
566
            </para>
422
567
          </listitem>
423
568
        </varlistentry>
424
569
      </variablelist>
428
573
  <refsect1 id="bugs">
429
574
    <title>BUGS</title>
430
575
    <para>
431
 
      There is no <option>--enable</option> option to enable disabled
432
 
      plugins.
 
576
      The <option>--config-file</option> option is ignored when
 
577
      specified from within a configuration file.
433
578
    </para>
 
579
    <xi:include href="bugs.xml"/>
434
580
  </refsect1>
435
581
  
436
582
  <refsect1 id="examples">
437
583
    <title>EXAMPLE</title>
438
 
    <para>
439
 
    </para>
 
584
    <informalexample>
 
585
      <para>
 
586
        Normal invocation needs no options:
 
587
      </para>
 
588
      <para>
 
589
        <userinput>&COMMANDNAME;</userinput>
 
590
      </para>
 
591
    </informalexample>
 
592
    <informalexample>
 
593
      <para>
 
594
        Run the program, but not the plugins, in debug mode:
 
595
      </para>
 
596
      <para>
 
597
        
 
598
        <!-- do not wrap this line -->
 
599
        <userinput>&COMMANDNAME; --debug</userinput>
 
600
        
 
601
      </para>
 
602
    </informalexample>
 
603
    <informalexample>
 
604
      <para>
 
605
        Run all plugins, but run the <quote>foo</quote> plugin in
 
606
        debug mode:
 
607
      </para>
 
608
      <para>
 
609
        
 
610
        <!-- do not wrap this line -->
 
611
        <userinput>&COMMANDNAME; --options-for=foo:--debug</userinput>
 
612
        
 
613
      </para>
 
614
    </informalexample>
 
615
    <informalexample>
 
616
      <para>
 
617
        Run all plugins, but not the program, in debug mode:
 
618
      </para>
 
619
      <para>
 
620
        
 
621
        <!-- do not wrap this line -->
 
622
        <userinput>&COMMANDNAME; --global-options=--debug</userinput>
 
623
        
 
624
      </para>
 
625
    </informalexample>
 
626
    <informalexample>
 
627
      <para>
 
628
        Read a different configuration file, run plugins from a
 
629
        different directory, specify an alternate plugin helper
 
630
        directory and add two options to the
 
631
        <citerefentry><refentrytitle >mandos-client</refentrytitle>
 
632
        <manvolnum>8mandos</manvolnum></citerefentry> plugin:
 
633
      </para>
 
634
      <para>
 
635
 
 
636
<!-- do not wrap this line -->
 
637
<userinput>cd /etc/keys/mandos; &COMMANDNAME;  --config-file=/etc/mandos/plugin-runner.conf --plugin-dir /usr/lib/x86_64-linux-gnu/mandos/plugins.d --plugin-helper-dir /usr/lib/x86_64-linux-gnu/mandos/plugin-helpers --options-for=mandos-client:--pubkey=pubkey.txt,--seckey=seckey.txt</userinput>
 
638
 
 
639
      </para>
 
640
    </informalexample>
440
641
  </refsect1>
441
 
  
442
642
  <refsect1 id="security">
443
643
    <title>SECURITY</title>
444
644
    <para>
 
645
      This program will, when starting, try to switch to another user.
 
646
      If it is started as root, it will succeed, and will by default
 
647
      switch to user and group 65534, which are assumed to be
 
648
      non-privileged.  This user and group is then what all plugins
 
649
      will be started as.  Therefore, the only way to run a plugin as
 
650
      a privileged user is to have the set-user-ID or set-group-ID bit
 
651
      set on the plugin executable file (see <citerefentry>
 
652
      <refentrytitle>execve</refentrytitle><manvolnum>2</manvolnum>
 
653
      </citerefentry>).
 
654
    </para>
 
655
    <para>
 
656
      If this program is used as a keyscript in <citerefentry
 
657
      ><refentrytitle>crypttab</refentrytitle><manvolnum>5</manvolnum>
 
658
      </citerefentry>, there is a slight risk that if this program
 
659
      fails to work, there might be no way to boot the system except
 
660
      for booting from another media and editing the initial RAM disk
 
661
      image to not run this program.  This is, however, unlikely,
 
662
      since the <citerefentry><refentrytitle
 
663
      >password-prompt</refentrytitle><manvolnum>8mandos</manvolnum>
 
664
      </citerefentry> plugin will read a password from the console in
 
665
      case of failure of the other plugins, and this plugin runner
 
666
      will also, in case of catastrophic failure, itself fall back to
 
667
      asking and outputting a password on the console (see <xref
 
668
      linkend="fallback"/>).
445
669
    </para>
446
670
  </refsect1>
447
671
  
448
672
  <refsect1 id="see_also">
449
673
    <title>SEE ALSO</title>
450
674
    <para>
 
675
      <citerefentry><refentrytitle>intro</refentrytitle>
 
676
      <manvolnum>8mandos</manvolnum></citerefentry>,
451
677
      <citerefentry><refentrytitle>cryptsetup</refentrytitle>
452
678
      <manvolnum>8</manvolnum></citerefentry>,
 
679
      <citerefentry><refentrytitle>crypttab</refentrytitle>
 
680
      <manvolnum>5</manvolnum></citerefentry>,
 
681
      <citerefentry><refentrytitle>execve</refentrytitle>
 
682
      <manvolnum>2</manvolnum></citerefentry>,
453
683
      <citerefentry><refentrytitle>mandos</refentrytitle>
454
684
      <manvolnum>8</manvolnum></citerefentry>,
455
685
      <citerefentry><refentrytitle>password-prompt</refentrytitle>
456
686
      <manvolnum>8mandos</manvolnum></citerefentry>,
457
 
      <citerefentry><refentrytitle>password-request</refentrytitle>
 
687
      <citerefentry><refentrytitle>mandos-client</refentrytitle>
458
688
      <manvolnum>8mandos</manvolnum></citerefentry>
459
689
    </para>
460
690
  </refsect1>