46
67
<refname><command>&COMMANDNAME;</command></refname>
48
Run Mandos plugins, pass data from first to succeed.
69
get password for encrypted rootdisk
54
75
<command>&COMMANDNAME;</command>
56
<arg choice="plain"><option>--global-env=<replaceable
57
>VAR</replaceable><literal>=</literal><replaceable
58
>value</replaceable></option></arg>
59
<arg choice="plain"><option>-G
60
<replaceable>VAR</replaceable><literal>=</literal><replaceable
61
>value</replaceable> </option></arg>
65
<arg choice="plain"><option>--env-for=<replaceable
66
>PLUGIN</replaceable><literal>:</literal><replaceable
67
>ENV</replaceable><literal>=</literal><replaceable
68
>value</replaceable></option></arg>
69
<arg choice="plain"><option>-E<replaceable>
70
PLUGIN</replaceable><literal>:</literal><replaceable
71
>ENV</replaceable><literal>=</literal><replaceable
72
>value</replaceable> </option></arg>
76
<arg choice="plain"><option>--global-options=<replaceable
77
>OPTIONS</replaceable></option></arg>
78
<arg choice="plain"><option>-g<replaceable>
79
OPTIONS</replaceable> </option></arg>
83
<arg choice="plain"><option>--options-for=<replaceable
84
>PLUGIN</replaceable><literal>:</literal><replaceable
85
>OPTIONS</replaceable></option></arg>
86
<arg choice="plain"><option>-o<replaceable>
87
PLUGIN</replaceable><literal>:</literal><replaceable
88
>OPTIONS</replaceable> </option></arg>
92
<arg choice="plain"><option>--disable=<replaceable
93
>PLUGIN</replaceable></option></arg>
94
<arg choice="plain"><option>-d
95
<replaceable>PLUGIN</replaceable> </option></arg>
99
<arg choice="plain"><option>--enable=<replaceable
100
>PLUGIN</replaceable></option></arg>
101
<arg choice="plain"><option>-e
102
<replaceable>PLUGIN</replaceable> </option></arg>
105
<arg><option>--groupid=<replaceable
106
>ID</replaceable></option></arg>
108
<arg><option>--userid=<replaceable
109
>ID</replaceable></option></arg>
111
<arg><option>--plugin-dir=<replaceable
112
>DIRECTORY</replaceable></option></arg>
114
<arg><option>--config-file=<replaceable
115
>FILE</replaceable></option></arg>
117
<arg><option>--debug</option></arg>
120
<command>&COMMANDNAME;</command>
122
<arg choice="plain"><option>--help</option></arg>
123
<arg choice="plain"><option>-?</option></arg>
127
<command>&COMMANDNAME;</command>
128
<arg choice="plain"><option>--usage</option></arg>
131
<command>&COMMANDNAME;</command>
133
<arg choice="plain"><option>--version</option></arg>
134
<arg choice="plain"><option>-V</option></arg>
76
<arg choice='opt' rep='repeat'>OPTION</arg>
139
80
<refsect1 id="description">
140
81
<title>DESCRIPTION</title>
142
<command>&COMMANDNAME;</command> is a program which is meant to
143
be specified as a <quote>keyscript</quote> for the root disk in
144
<citerefentry><refentrytitle>crypttab</refentrytitle>
145
<manvolnum>5</manvolnum></citerefentry>. The aim of this
146
program is therefore to output a password, which then
147
<citerefentry><refentrytitle>cryptsetup</refentrytitle>
148
<manvolnum>8</manvolnum></citerefentry> will use to unlock the
152
This program is not meant to be invoked directly, but can be in
153
order to test it. Note that any password obtained will simply
154
be output on standard output.
158
<refsect1 id="purpose">
159
<title>PURPOSE</title>
161
The purpose of this is to enable <emphasis>remote and unattended
162
rebooting</emphasis> of client host computer with an
163
<emphasis>encrypted root file system</emphasis>. See <xref
164
linkend="overview"/> for details.
169
<title>OPTIONS</title>
83
<command>&COMMANDNAME;</command> is a plugin runner that waits
84
for any of its plugins to return sucessfull with a password, and
85
passes it to cryptsetup. plugins is defined as any executables
86
in the plugins directory will by default will be
87
/conf/conf.d/mandos/plugins.d. to stdout.
172
<term><option>--global-env
173
<replaceable>VAR</replaceable><literal>=</literal><replaceable
174
>value</replaceable></option></term>
176
<replaceable>VAR</replaceable><literal>=</literal><replaceable
177
>value</replaceable></option></term>
180
This option will add an environment variable setting to
181
all plugins. This will override any inherited environment
188
<term><option>--env-for
189
<replaceable>PLUGIN</replaceable><literal>:</literal
190
><replaceable>ENV</replaceable><literal>=</literal
191
><replaceable>value</replaceable></option></term>
193
<replaceable>PLUGIN</replaceable><literal>:</literal
194
><replaceable>ENV</replaceable><literal>=</literal
195
><replaceable>value</replaceable></option></term>
198
This option will add an environment variable setting to
199
the <replaceable>PLUGIN</replaceable> plugin. This will
200
override any inherited environment variables or
201
environment variables specified using
202
<option>--global-env</option>.
208
<term><option>--global-options
209
<replaceable>OPTIONS</replaceable></option></term>
211
<replaceable>OPTIONS</replaceable></option></term>
214
Pass some options to <emphasis>all</emphasis> plugins.
215
<replaceable>OPTIONS</replaceable> is a comma separated
216
list of options. This is not a very useful option, except
217
for specifying the <quote><option>--debug</option></quote>
218
option to all plugins.
224
<term><option>--options-for
225
<replaceable>PLUGIN</replaceable><literal>:</literal
226
><replaceable>OPTION</replaceable></option></term>
228
<replaceable>PLUGIN</replaceable><literal>:</literal
229
><replaceable>OPTION</replaceable></option></term>
232
Pass some options to a specific plugin. <replaceable
233
>PLUGIN</replaceable> is the name (file basename) of a
234
plugin, and <replaceable>OPTIONS</replaceable> is a comma
235
separated list of options.
238
Note that since options are not split on whitespace, the
239
way to pass, to the plugin
240
<quote><filename>foo</filename></quote>, the option
241
<option>--bar</option> with the option argument
242
<quote>baz</quote> is either
243
<userinput>--options-for=foo:--bar=baz</userinput> or
244
<userinput>--options-for=foo:--bar,baz</userinput>. Using
245
<userinput>--options-for="foo:--bar baz"</userinput>. will
246
<emphasis>not</emphasis> work.
252
<term><option>--disable
253
<replaceable>PLUGIN</replaceable></option></term>
255
<replaceable>PLUGIN</replaceable></option></term>
258
Disable the plugin named
259
<replaceable>PLUGIN</replaceable>. The plugin will not be
266
<term><option>--enable
267
<replaceable>PLUGIN</replaceable></option></term>
269
<replaceable>PLUGIN</replaceable></option></term>
272
Re-enable the plugin named
273
<replaceable>PLUGIN</replaceable>. This is only useful to
274
undo a previous <option>--disable</option> option, maybe
275
from the configuration file.
281
<term><option>--groupid
282
<replaceable>ID</replaceable></option></term>
285
Change to group ID <replaceable>ID</replaceable> on
286
startup. The default is 65534. All plugins will be
287
started using this group ID. <emphasis>Note:</emphasis>
288
This must be a number, not a name.
294
<term><option>--userid
295
<replaceable>ID</replaceable></option></term>
298
Change to user ID <replaceable>ID</replaceable> on
299
startup. The default is 65534. All plugins will be
300
started using this user ID. <emphasis>Note:</emphasis>
301
This must be a number, not a name.
307
<term><option>--plugin-dir
308
<replaceable>DIRECTORY</replaceable></option></term>
311
Specify a different plugin directory. The default is
312
<filename>/lib/mandos/plugins.d</filename>, which will
313
exist in the initial <acronym>RAM</acronym> disk
320
<term><option>--config-file
321
<replaceable>FILE</replaceable></option></term>
324
Specify a different file to read additional options from.
325
See <xref linkend="files"/>. Other command line options
326
will override options specified in the file.
332
<term><option>--debug</option></term>
335
Enable debug mode. This will enable a lot of output to
336
standard error about what the program is doing. The
337
program will still perform all other functions normally.
338
The default is to <emphasis>not</emphasis> run in debug
342
The plugins will <emphasis>not</emphasis> be affected by
344
<userinput><option>--global-options=--debug</option></userinput>
345
if complete debugging eruption is desired.
351
<term><option>--help</option></term>
352
<term><option>-?</option></term>
355
Gives a help message about options and their meanings.
361
<term><option>--usage</option></term>
364
Gives a short usage message.
370
<term><option>--version</option></term>
371
<term><option>-V</option></term>
374
Prints the program version.
92
<term><literal>-g</literal>,<literal>--global-options
93
<replaceable>OPTIONS</replaceable></literal></term>
96
Global options given to all plugins as additional start
97
arguments. Options are specified with a -o flag followed
98
by a comma separated string of options.
104
<term><literal>-o</literal>,<literal> --options-for
105
<replaceable>PLUGIN</replaceable>:<replaceable>OPTION</replaceable>
109
Plugin specific options given to the plugin as additional
110
start arguments. Options are specified with a -o flag
111
followed by a comma separated string of options.
117
<term><literal>-d</literal>,<literal> --disable
118
<replaceable>PLUGIN</replaceable>
122
Disable a specific plugin
128
<term><literal>--groupid <replaceable>ID</replaceable>
132
Group ID the plugins will run as
138
<term><literal>--userid <replaceable>ID</replaceable>
142
User ID the plugins will run as
148
<term><literal>--plugin-dir <replaceable>DIRECTORY</replaceable>
152
Specify a different plugin directory
158
<term><literal>--debug</literal></term>
167
<term><literal>-?</literal>, <literal>--help</literal></term>
176
<term><literal>--usage</literal></term>
179
Gives a short usage message
185
<term><literal>-V</literal>, <literal>--version</literal></term>
188
Prints the program version
381
<refsect1 id="overview">
382
<title>OVERVIEW</title>
383
<xi:include href="overview.xml"/>
385
This program will run on the client side in the initial
386
<acronym>RAM</acronym> disk environment, and is responsible for
387
getting a password. It does this by running plugins, one of
388
which will normally be the actual client program communicating
392
<refsect1 id="plugins">
393
<title>PLUGINS</title>
395
This program will get a password by running a number of
396
<firstterm>plugins</firstterm>, which are simply executable
397
programs in a directory in the initial <acronym>RAM</acronym>
398
disk environment. The default directory is
399
<filename>/lib/mandos/plugins.d</filename>, but this can be
400
changed with the <option>--plugin-dir</option> option. The
401
plugins are started in parallel, and the first plugin to output
402
a password <emphasis>and</emphasis> exit with a successful exit
403
code will make this plugin-runner output the password from that
404
plugin, stop any other plugins, and exit.
407
<refsect2 id="writing_plugins">
408
<title>WRITING PLUGINS</title>
410
A plugin is simply a program which prints a password to its
411
standard output and then exits with a successful (zero) exit
412
status. If the exit status is not zero, any output on
413
standard output will be ignored by the plugin runner. Any
414
output on its standard error channel will simply be passed to
415
the standard error of the plugin runner, usually the system
419
The plugin will run in the initial RAM disk environment, so
420
care must be taken not to depend on any files or running
421
services not available there.
424
The plugin must exit cleanly and free all allocated resources
425
upon getting the TERM signal, since this is what the plugin
426
runner uses to stop all other plugins when one plugin has
427
output a password and exited cleanly.
430
The plugin must not use resources, like for instance reading
431
from the standard input, without knowing that no other plugin
435
It is useful, but not required, for the plugin to take the
436
<option>--debug</option> option.
441
<refsect1 id="fallback">
442
<title>FALLBACK</title>
444
If no plugins succeed, this program will, as a fallback, ask for
445
a password on the console using <citerefentry><refentrytitle
446
>getpass</refentrytitle><manvolnum>3</manvolnum></citerefentry>,
447
and output it. This is not meant to be the normal mode of
448
operation, as there is a separate plugin for getting a password
453
<refsect1 id="exit_status">
454
<title>EXIT STATUS</title>
456
Exit status of this program is zero if no errors were
457
encountered, and otherwise not. The fallback (see <xref
458
linkend="fallback"/>) may or may not have succeeded in either
463
<refsect1 id="environment">
464
<title>ENVIRONMENT</title>
466
This program does not use any environment variables itself, it
467
only passes on its environment to all the plugins. The
468
environment passed to plugins can be modified using the
469
<option>--global-env</option> and <option>--env-for</option>
474
<refsect1 id="files">
480
>/conf/conf.d/mandos/plugin-runner.conf</filename></term>
483
Since this program will be run as a keyscript, there is
484
little to no opportunity to pass command line arguments
485
to it. Therefore, it will <emphasis>also</emphasis>
486
read this file and use its contents as
487
whitespace-separated command line options. Also,
488
everything from a <quote>#</quote> character to the end
489
of a line is ignored.
492
This program is meant to run in the initial RAM disk
493
environment, so that is where this file is assumed to
494
exist. The file does not need to exist in the normal
498
This file will be processed <emphasis>before</emphasis>
499
the normal command line options, so the latter can
500
override the former, if need be.
503
This file name is the default; the file to read for
504
arguments can be changed using the
505
<option>--config-file</option> option.
516
The <option>--config-file</option> option is ignored when
517
specified from within a configuration file.
521
<refsect1 id="examples">
522
<title>EXAMPLE</title>
525
Normal invocation needs no options:
528
<userinput>&COMMANDNAME;</userinput>
533
Run the program, but not the plugins, in debug mode:
537
<!-- do not wrap this line -->
538
<userinput>&COMMANDNAME; --debug</userinput>
544
Run all plugins, but run the <quote>foo</quote> plugin in
549
<!-- do not wrap this line -->
550
<userinput>&COMMANDNAME; --options-for=foo:--debug</userinput>
556
Run all plugins, but not the program, in debug mode:
560
<!-- do not wrap this line -->
561
<userinput>&COMMANDNAME; --global-options=--debug</userinput>
567
Run plugins from a different directory, read a different
568
configuration file, and add two options to the
569
<citerefentry><refentrytitle >password-request</refentrytitle>
570
<manvolnum>8mandos</manvolnum></citerefentry> plugin:
574
<!-- do not wrap this line -->
575
<userinput>&COMMANDNAME; --config-file=/etc/mandos/plugin-runner.conf --plugin-dir /usr/lib/mandos/plugins.d --options-for=password-request:--pubkey=/etc/keys/mandos/pubkey.txt,--seckey=/etc/keys/mandos/seckey.txt</userinput>
580
<refsect1 id="security">
581
<title>SECURITY</title>
583
This program will, when starting, try to switch to another user.
584
If it is started as root, it will succeed, and will by default
585
switch to user and group 65534, which are assumed to be
586
non-privileged. This user and group is then what all plugins
587
will be started as. Therefore, the only way to run a plugin as
588
a privileged user is to have the set-user-ID or set-group-ID bit
589
set on the plugin executable files (see <citerefentry>
590
<refentrytitle>execve</refentrytitle><manvolnum>2</manvolnum>
594
If this program is used as a keyscript in <citerefentry
595
><refentrytitle>crypttab</refentrytitle><manvolnum>5</manvolnum>
596
</citerefentry>, there is a slight risk that if this program
597
fails to work, there might be no way to boot the system except
598
for booting from another media and editing the initial RAM disk
599
image to not run this program. This is, however, unlikely,
600
since the <citerefentry><refentrytitle
601
>password-prompt</refentrytitle><manvolnum>8mandos</manvolnum>
602
</citerefentry> plugin will read a password from the console in
603
case of failure of the other plugins, and this plugin runner
604
will also, in case of catastrophic failure, itself fall back to
605
asking and outputting a password on the console (see <xref
606
linkend="fallback"/>).
610
<refsect1 id="see_also">
611
<title>SEE ALSO</title>
613
<citerefentry><refentrytitle>cryptsetup</refentrytitle>
614
<manvolnum>8</manvolnum></citerefentry>,
615
<citerefentry><refentrytitle>crypttab</refentrytitle>
616
<manvolnum>5</manvolnum></citerefentry>,
617
<citerefentry><refentrytitle>execve</refentrytitle>
618
<manvolnum>2</manvolnum></citerefentry>,
619
<citerefentry><refentrytitle>mandos</refentrytitle>
620
<manvolnum>8</manvolnum></citerefentry>,
621
<citerefentry><refentrytitle>password-prompt</refentrytitle>
622
<manvolnum>8mandos</manvolnum></citerefentry>,
623
<citerefentry><refentrytitle>password-request</refentrytitle>
624
<manvolnum>8mandos</manvolnum></citerefentry>
629
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630
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