12
11
<title>Mandos Manual</title>
13
12
<!-- Nwalsh’s docbook scripts use this to generate the footer: -->
14
13
<productname>Mandos</productname>
15
<productnumber>&version;</productnumber>
14
<productnumber>&VERSION;</productnumber>
16
15
<date>&TIMESTAMP;</date>
19
18
<firstname>Björn</firstname>
20
19
<surname>Påhlsson</surname>
22
<email>belorn@recompile.se</email>
21
<email>belorn@fukt.bsnet.se</email>
26
25
<firstname>Teddy</firstname>
27
26
<surname>Hogeborn</surname>
29
<email>teddy@recompile.se</email>
28
<email>teddy@fukt.bsnet.se</email>
45
34
<holder>Teddy Hogeborn</holder>
46
35
<holder>Björn Påhlsson</holder>
48
37
<xi:include href="legalnotice.xml"/>
52
41
<refentrytitle>&COMMANDNAME;</refentrytitle>
53
42
<manvolnum>8mandos</manvolnum>
57
46
<refname><command>&COMMANDNAME;</command></refname>
59
Run Mandos plugins, pass data from first to succeed.
48
Run Mandos plugins. Pass data from first succesful one.
65
54
<command>&COMMANDNAME;</command>
66
55
<group rep="repeat">
67
56
<arg choice="plain"><option>--global-env=<replaceable
68
>ENV</replaceable><literal>=</literal><replaceable
57
>VAR</replaceable><literal>=</literal><replaceable
69
58
>value</replaceable></option></arg>
70
<arg choice="plain"><option>-G
71
<replaceable>ENV</replaceable><literal>=</literal><replaceable
59
<arg choice="plain"><option>-e
60
<replaceable>VAR</replaceable><literal>=</literal><replaceable
72
61
>value</replaceable> </option></arg>
154
130
<title>DESCRIPTION</title>
156
132
<command>&COMMANDNAME;</command> is a program which is meant to
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
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.
166
142
This program is not meant to be invoked directly, but can be in
255
231
<option>--bar</option> with the option argument
256
232
<quote>baz</quote> is either
257
233
<userinput>--options-for=foo:--bar=baz</userinput> or
258
<userinput>--options-for=foo:--bar,baz</userinput>. Using
259
<userinput>--options-for="foo:--bar baz"</userinput>. will
260
<emphasis>not</emphasis> work.
234
<userinput>--options-for=foo:--bar,baz</userinput>, but
235
<emphasis>not</emphasis>
236
<userinput>--options-for="foo:--bar baz"</userinput>.
266
<term><option>--disable
242
<term><option> --disable
267
243
<replaceable>PLUGIN</replaceable></option></term>
269
245
<replaceable>PLUGIN</replaceable></option></term>
334
<term><option>--plugin-helper-dir
335
<replaceable>DIRECTORY</replaceable></option></term>
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"/>)
349
<term><option>--config-file
350
<replaceable>FILE</replaceable></option></term>
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.
361
295
<term><option>--debug</option></term>
432
366
code will make this plugin-runner output the password from that
433
367
plugin, stop any other plugins, and exit.
436
<refsect2 id="writing_plugins">
437
<title>WRITING PLUGINS</title>
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
448
If the password is a single-line, manually entered passprase,
449
a final trailing newline character should
450
<emphasis>not</emphasis> be printed.
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.
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.
468
The plugin must not use resources, like for instance reading
469
from the standard input, without knowing that no other plugin
473
It is useful, but not required, for the plugin to take the
474
<option>--debug</option> option.
479
371
<refsect1 id="fallback">
529
415
of a line is ignored.
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
538
418
This file will be processed <emphasis>before</emphasis>
539
419
the normal command line options, so the latter can
540
420
override the former, if need be.
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.
550
<term><filename class="directory"
551
>/lib/mandos/plugins.d</filename></term>
554
The default plugin directory; can be changed by the
555
<option>--plugin-dir</option> option.
560
<term><filename class="directory"
561
>/lib/mandos/plugin-helpers</filename></term>
564
The default plugin helper directory; can be changed by
565
the <option>--plugin-helper-dir</option> option.
573
428
<refsect1 id="bugs">
574
429
<title>BUGS</title>
576
The <option>--config-file</option> option is ignored when
577
specified from within a configuration file.
431
There is no <option>--enable</option> option to enable disabled
579
<xi:include href="bugs.xml"/>
582
436
<refsect1 id="examples">
583
437
<title>EXAMPLE</title>
586
Normal invocation needs no options:
589
<userinput>&COMMANDNAME;</userinput>
594
Run the program, but not the plugins, in debug mode:
598
<!-- do not wrap this line -->
599
<userinput>&COMMANDNAME; --debug</userinput>
605
Run all plugins, but run the <quote>foo</quote> plugin in
610
<!-- do not wrap this line -->
611
<userinput>&COMMANDNAME; --options-for=foo:--debug</userinput>
617
Run all plugins, but not the program, in debug mode:
621
<!-- do not wrap this line -->
622
<userinput>&COMMANDNAME; --global-options=--debug</userinput>
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:
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>
642
442
<refsect1 id="security">
643
443
<title>SECURITY</title>
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>
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"/>).
672
448
<refsect1 id="see_also">
673
449
<title>SEE ALSO</title>
675
<citerefentry><refentrytitle>intro</refentrytitle>
676
<manvolnum>8mandos</manvolnum></citerefentry>,
677
451
<citerefentry><refentrytitle>cryptsetup</refentrytitle>
678
452
<manvolnum>8</manvolnum></citerefentry>,
679
<citerefentry><refentrytitle>crypttab</refentrytitle>
680
<manvolnum>5</manvolnum></citerefentry>,
681
<citerefentry><refentrytitle>execve</refentrytitle>
682
<manvolnum>2</manvolnum></citerefentry>,
683
453
<citerefentry><refentrytitle>mandos</refentrytitle>
684
454
<manvolnum>8</manvolnum></citerefentry>,
685
455
<citerefentry><refentrytitle>password-prompt</refentrytitle>
686
456
<manvolnum>8mandos</manvolnum></citerefentry>,
687
<citerefentry><refentrytitle>mandos-client</refentrytitle>
457
<citerefentry><refentrytitle>password-request</refentrytitle>
688
458
<manvolnum>8mandos</manvolnum></citerefentry>