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Viewing changes to dracut-module/password-agent.xml

  • Committer: Teddy Hogeborn
  • Date: 2008-08-29 05:53:59 UTC
  • Revision ID: teddy@fukt.bsnet.se-20080829055359-wkdasnyxtylmnxus
* mandos.xml (EXAMPLE): Replaced all occurences of command name with
                        "&COMMANDNAME;".

* plugins.d/password-prompt.c (main): Improved some documentation
                                      strings.  Do perror() of
                                      tcgetattr() fails.  Add debug
                                      output if interrupted by signal.
                                      Loop over write() instead of
                                      using fwrite() when outputting
                                      password.  Add debug output if
                                      getline() returns 0, unless it
                                      was caused by a signal.  Add
                                      exit status code to debug
                                      output.

* plugins.d/password-prompt.xml: Changed all single quotes to double
                                 quotes for consistency.  Removed
                                 <?xml-stylesheet>.
  (ENTITY TIMESTAMP): New.  Automatically updated by Emacs time-stamp
                      by using Emacs local variables.
  (/refentry/refentryinfo/title): Changed to "Mandos Manual".
  (/refentry/refentryinfo/productname): Changed to "Mandos".
  (/refentry/refentryinfo/date): New; set to "&TIMESTAMP;".
  (/refentry/refentryinfo/copyright): Split copyright holders.
  (/refentry/refnamediv/refpurpose): Improved wording.
  (SYNOPSIS): Fix to use correct markup.  Add short options.
  (DESCRIPTION, OPTIONS): Improved wording.
  (OPTIONS): Improved wording.  Use more correct markup.  Document
             short options.
  (EXIT STATUS): Add text.
  (ENVIRONMENT): Document use of "cryptsource" and "crypttarget".
  (FILES): REMOVED.
  (BUGS): Add text.
  (EXAMPLE): Added some examples.
  (SECURITY): Added text.
  (SEE ALSO): Remove reference to mandos(8).  Add reference to
              crypttab(5).

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Lines of Context:
dracut-module/password-agent.xml
1
 
<?xml version="1.0" encoding="UTF-8"?>
2
 
<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
3
 
        "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
4
 
<!ENTITY COMMANDNAME "password-agent">
5
 
<!ENTITY TIMESTAMP "2020-09-16">
6
 
<!ENTITY % common SYSTEM "../common.ent">
7
 
%common;
8
 
]>
9
 
 
10
 
<refentry xmlns:xi="http://www.w3.org/2001/XInclude">
11
 
  <refentryinfo>
12
 
    <title>Mandos Manual</title>
13
 
    <!-- Nwalsh’s docbook scripts use this to generate the footer: -->
14
 
    <productname>Mandos</productname>
15
 
    <productnumber>&version;</productnumber>
16
 
    <date>&TIMESTAMP;</date>
17
 
    <authorgroup>
18
 
      <author>
19
 
        <firstname>Björn</firstname>
20
 
        <surname>Påhlsson</surname>
21
 
        <address>
22
 
          <email>belorn@recompile.se</email>
23
 
        </address>
24
 
      </author>
25
 
      <author>
26
 
        <firstname>Teddy</firstname>
27
 
        <surname>Hogeborn</surname>
28
 
        <address>
29
 
          <email>teddy@recompile.se</email>
30
 
        </address>
31
 
      </author>
32
 
    </authorgroup>
33
 
    <copyright>
34
 
      <year>2019</year>
35
 
      <holder>Teddy Hogeborn</holder>
36
 
      <holder>Björn Påhlsson</holder>
37
 
    </copyright>
38
 
    <xi:include href="../legalnotice.xml"/>
39
 
  </refentryinfo>
40
 
 
41
 
  <refmeta>
42
 
    <refentrytitle>&COMMANDNAME;</refentrytitle>
43
 
    <manvolnum>8mandos</manvolnum>
44
 
  </refmeta>
45
 
 
46
 
  <refnamediv>
47
 
    <refname><command>&COMMANDNAME;</command></refname>
48
 
    <refpurpose>
49
 
      Run Mandos client as a systemd password agent.
50
 
    </refpurpose>
51
 
  </refnamediv>
52
 
 
53
 
  <refsynopsisdiv>
54
 
    <cmdsynopsis>
55
 
      <command>&COMMANDNAME;</command>
56
 
      <arg><option>--agent-directory=<replaceable
57
 
      >DIRECTORY</replaceable></option></arg>
58
 
      <sbr/>
59
 
      <arg><option>--helper-directory=<replaceable
60
 
      >DIRECTORY</replaceable></option></arg>
61
 
      <sbr/>
62
 
      <!-- <arg><option>-\-plugin-helper-dir=<replaceable -->
63
 
      <!-- >DIRECTORY</replaceable></option></arg> -->
64
 
      <!-- <sbr/> -->
65
 
      <arg><option>--user=<replaceable
66
 
      >USERID</replaceable></option></arg>
67
 
      <sbr/>
68
 
      <!-- <arg><option>-\-userid=<replaceable -->
69
 
      <!-- >ID</replaceable></option></arg> -->
70
 
      <!-- <sbr/> -->
71
 
      <arg><option>--group=<replaceable
72
 
      >GROUPID</replaceable></option></arg>
73
 
      <sbr/>
74
 
      <!-- <arg><option>-\-groupid=<replaceable -->
75
 
      <!-- >ID</replaceable></option></arg> -->
76
 
      <!-- <sbr/> -->
77
 
      <arg>--</arg>
78
 
      <arg>
79
 
        <replaceable>MANDOS_CLIENT</replaceable>
80
 
        <group rep="repeat">
81
 
          <arg choice="plain"><replaceable>OPTIONS</replaceable></arg>
82
 
        </group>
83
 
      </arg>
84
 
    </cmdsynopsis>
85
 
    <cmdsynopsis>
86
 
      <command>&COMMANDNAME;</command>
87
 
      <arg choice="plain"><option>--test</option></arg>
88
 
    </cmdsynopsis>
89
 
    <cmdsynopsis>
90
 
      <command>&COMMANDNAME;</command>
91
 
      <group choice="req">
92
 
        <arg choice="plain"><option>--help</option></arg>
93
 
        <arg choice="plain"><option>-?</option></arg>
94
 
      </group>
95
 
    </cmdsynopsis>
96
 
    <cmdsynopsis>
97
 
      <command>&COMMANDNAME;</command>
98
 
      <arg choice="plain"><option>--usage</option></arg>
99
 
    </cmdsynopsis>
100
 
    <cmdsynopsis>
101
 
      <command>&COMMANDNAME;</command>
102
 
      <group choice="req">
103
 
        <arg choice="plain"><option>--version</option></arg>
104
 
        <arg choice="plain"><option>-V</option></arg>
105
 
      </group>
106
 
    </cmdsynopsis>
107
 
  </refsynopsisdiv>
108
 
 
109
 
  <refsect1 id="description">
110
 
    <title>DESCRIPTION</title>
111
 
    <para>
112
 
      <command>&COMMANDNAME;</command> is a program which is meant to
113
 
      be a <citerefentry><refentrytitle>systemd</refentrytitle>
114
 
      <manvolnum>1</manvolnum></citerefentry> <quote>Password
115
 
      Agent</quote> (See <ulink
116
 
      url="https://systemd.io/PASSWORD_AGENTS/">Password
117
 
      Agents</ulink>).  The aim of this program is therefore to
118
 
      acquire and then send a password to some other program which
119
 
      will use the password to unlock the encrypted root disk.
120
 
    </para>
121
 
    <para>
122
 
      This program is not meant to be invoked directly, but can be in
123
 
      order to test it.
124
 
    </para>
125
 
  </refsect1>
126
 
 
127
 
  <refsect1 id="purpose">
128
 
    <title>PURPOSE</title>
129
 
    <para>
130
 
      The purpose of this is to enable <emphasis>remote and unattended
131
 
      rebooting</emphasis> of client host computer with an
132
 
      <emphasis>encrypted root file system</emphasis>.  See <xref
133
 
      linkend="overview"/> for details.
134
 
    </para>
135
 
  </refsect1>
136
 
 
137
 
  <refsect1>
138
 
    <title>OPTIONS</title>
139
 
    <variablelist>
140
 
 
141
 
      <varlistentry>
142
 
        <term><option>--agent-directory
143
 
        <replaceable>DIRECTORY</replaceable></option></term>
144
 
        <listitem>
145
 
          <para>
146
 
            Specify a different agent directory.  The default is
147
 
            <quote><filename class="directory"
148
 
            >/run/systemd/ask-password</filename ></quote> as per the
149
 
            <ulink url="https://systemd.io/PASSWORD_AGENTS/">Password
150
 
            Agents</ulink> specification.
151
 
          </para>
152
 
        </listitem>
153
 
      </varlistentry>
154
 
 
155
 
      <varlistentry>
156
 
        <term><option>--helper-directory
157
 
        <replaceable>DIRECTORY</replaceable></option></term>
158
 
        <listitem>
159
 
          <para>
160
 
            Specify a different helper directory.  The default is
161
 
            <quote><filename class="directory"
162
 
                             >/lib/mandos/plugin-helpers</filename
163
 
                             ></quote>, which
164
 
            will exist in the initial <acronym>RAM</acronym> disk
165
 
            environment.  (This will simply be passed to the
166
 
            <replaceable>MANDOS_CLIENT</replaceable> program via the
167
 
            <envar>MANDOSPLUGINHELPERDIR</envar> environment variable.
168
 
            See
169
 
            <citerefentry><refentrytitle>mandos-client</refentrytitle
170
 
            ><manvolnum>8mandos</manvolnum></citerefentry>.)
171
 
          </para>
172
 
        </listitem>
173
 
      </varlistentry>
174
 
 
175
 
      <varlistentry>
176
 
        <term><option>--user
177
 
        <replaceable>USERID</replaceable></option></term>
178
 
        <listitem>
179
 
          <para>
180
 
            Change real user ID to <replaceable>USERID</replaceable>
181
 
            when running <replaceable>MANDOS_CLIENT</replaceable>.
182
 
            The default is 65534.  <emphasis>Note:</emphasis> This
183
 
            must be a number, not a name.
184
 
          </para>
185
 
        </listitem>
186
 
      </varlistentry>
187
 
 
188
 
      <varlistentry>
189
 
        <term><option>--group
190
 
        <replaceable>GROUPID</replaceable></option></term>
191
 
        <listitem>
192
 
          <para>
193
 
            Change real group ID to <replaceable>GROUPID</replaceable>
194
 
            when running <replaceable>MANDOS_CLIENT</replaceable>.
195
 
            The default is 65534.  <emphasis>Note:</emphasis> This
196
 
            must be a number, not a name.
197
 
          </para>
198
 
        </listitem>
199
 
      </varlistentry>
200
 
 
201
 
      <varlistentry>
202
 
        <term><replaceable>MANDOS_CLIENT</replaceable></term>
203
 
        <listitem>
204
 
          <para>
205
 
            This specifies the file name for
206
 
            <citerefentry><refentrytitle>mandos-client</refentrytitle
207
 
            ><manvolnum>8mandos</manvolnum></citerefentry>.  If the
208
 
            <quote><option>--</option></quote> option is given, any
209
 
            following options are passed to the <replaceable
210
 
            >MANDOS_CLIENT</replaceable> program.  The default is
211
 
            <quote><filename
212
 
            >/lib/mandos/plugins.d/mandos-client</filename ></quote>
213
 
            (which is the correct location for the initial
214
 
            <acronym>RAM</acronym> disk environment) without any
215
 
            options.
216
 
          </para>
217
 
        </listitem>
218
 
      </varlistentry>
219
 
 
220
 
      <varlistentry>
221
 
        <term><option>--help</option></term>
222
 
        <term><option>-?</option></term>
223
 
        <listitem>
224
 
          <para>
225
 
            Gives a help message about options and their meanings.
226
 
          </para>
227
 
        </listitem>
228
 
      </varlistentry>
229
 
 
230
 
      <varlistentry>
231
 
        <term><option>--test</option></term>
232
 
        <listitem>
233
 
          <para>
234
 
            Ignore normal operation; instead only run self-tests.
235
 
            Adding the <option>--help</option> option may show more
236
 
            options possible in combination with
237
 
            <option>--test</option>.
238
 
          </para>
239
 
        </listitem>
240
 
      </varlistentry>
241
 
 
242
 
      <varlistentry>
243
 
        <term><option>--usage</option></term>
244
 
        <listitem>
245
 
          <para>
246
 
            Gives a short usage message.
247
 
          </para>
248
 
        </listitem>
249
 
      </varlistentry>
250
 
 
251
 
      <varlistentry>
252
 
        <term><option>--version</option></term>
253
 
        <term><option>-V</option></term>
254
 
        <listitem>
255
 
          <para>
256
 
            Prints the program version.
257
 
          </para>
258
 
        </listitem>
259
 
      </varlistentry>
260
 
    </variablelist>
261
 
  </refsect1>
262
 
 
263
 
  <refsect1 id="overview">
264
 
    <title>OVERVIEW</title>
265
 
    <xi:include href="../overview.xml"/>
266
 
    <para>
267
 
      This program, &COMMANDNAME;, will run on the client side in the
268
 
      initial <acronym>RAM</acronym> disk environment, and is
269
 
      responsible for getting a password from the Mandos client
270
 
      program itself, and to send that password to whatever is
271
 
      currently asking for a password using the systemd <ulink
272
 
      url="https://systemd.io/PASSWORD_AGENTS/">Password
273
 
      Agents</ulink> mechanism.
274
 
    </para>
275
 
    <para>To accomplish this, &COMMANDNAME; runs the
276
 
    <command>mandos-client</command> program (which is the actual
277
 
    client program communicating with the Mandos server) or,
278
 
    alternatively, any executable file specified as
279
 
    <replaceable>MANDOS_CLIENT</replaceable>, and, as soon as a
280
 
    password is acquired from the
281
 
    <replaceable>MANDOS_CLIENT</replaceable> program, sends that
282
 
    password (as per the <ulink
283
 
    url="https://systemd.io/PASSWORD_AGENTS/">Password Agents</ulink>
284
 
    specification) to all currently unanswered password questions.
285
 
    </para>
286
 
    <para>
287
 
      This program should be started (normally as a systemd service,
288
 
      which in turn is normally started by a <citerefentry
289
 
      ><refentrytitle>systemd.path</refentrytitle>
290
 
      <manvolnum>5</manvolnum></citerefentry> file) as a reaction to
291
 
      files named <quote><filename>ask.<replaceable>xxxx</replaceable
292
 
      ></filename></quote> appearing in the agent directory
293
 
      <quote><filename
294
 
      class="directory">/run/systemd/ask-password</filename></quote>
295
 
      (or the directory specified by
296
 
      <option>--agent-directory</option>).
297
 
    </para>
298
 
  </refsect1>
299
 
 
300
 
  <refsect1 id="exit_status">
301
 
    <title>EXIT STATUS</title>
302
 
    <para>
303
 
      Exit status of this program is zero if no errors were
304
 
      encountered, and otherwise not.
305
 
    </para>
306
 
  </refsect1>
307
 
 
308
 
  <refsect1 id="environment">
309
 
    <title>ENVIRONMENT</title>
310
 
    <para>
311
 
      This program does not use any environment variables itself, it
312
 
      only passes on its environment to
313
 
      <replaceable>MANDOS_CLIENT</replaceable>.  Also, the
314
 
      <option>--helper-directory</option> option will affect the
315
 
      environment variable <envar>MANDOSPLUGINHELPERDIR</envar> for
316
 
      <replaceable>MANDOS_CLIENT</replaceable>.
317
 
    </para>
318
 
  </refsect1>
319
 
 
320
 
  <refsect1 id="files">
321
 
    <title>FILES</title>
322
 
    <para>
323
 
      <variablelist>
324
 
        <varlistentry>
325
 
          <term><filename class="directory"
326
 
                          >/run/systemd/ask-password</filename></term>
327
 
          <listitem>
328
 
            <para>
329
 
              The default directory to watch for password questions as
330
 
              per the <ulink
331
 
              url="https://systemd.io/PASSWORD_AGENTS/">Password
332
 
              Agents</ulink> specification; can be changed by the
333
 
              <option>--agent-directory</option> option.
334
 
            </para>
335
 
          </listitem>
336
 
        </varlistentry>
337
 
        <varlistentry>
338
 
          <term><filename class="directory"
339
 
                          >/lib/mandos/plugin-helpers</filename
340
 
                          ></term>
341
 
          <listitem>
342
 
            <para>
343
 
              The helper directory as supplied to
344
 
              <replaceable>MANDOS_CLIENT</replaceable> via the
345
 
              <envar>MANDOSPLUGINHELPERDIR</envar> environment
346
 
              variable; can be changed by the
347
 
              <option>--helper-directory</option> option.
348
 
            </para>
349
 
          </listitem>
350
 
        </varlistentry>
351
 
      </variablelist>
352
 
    </para>
353
 
  </refsect1>
354
 
 
355
 
  <refsect1 id="bugs">
356
 
    <title>BUGS</title>
357
 
    <xi:include href="../bugs.xml"/>
358
 
  </refsect1>
359
 
 
360
 
  <refsect1 id="examples">
361
 
    <title>EXAMPLE</title>
362
 
    <informalexample>
363
 
      <para>
364
 
        Normal invocation needs no options:
365
 
      </para>
366
 
      <para>
367
 
        <userinput>&COMMANDNAME;</userinput>
368
 
      </para>
369
 
    </informalexample>
370
 
    <informalexample>
371
 
      <para>
372
 
        Run an alternative <replaceable>MANDOS_CLIENT</replaceable>
373
 
        program::
374
 
      </para>
375
 
      <para>
376
 
        <userinput>&COMMANDNAME; /usr/local/sbin/alternate</userinput>
377
 
      </para>
378
 
    </informalexample>
379
 
    <informalexample>
380
 
      <para>
381
 
        Use alternative locations for the helper directory and the
382
 
        Mandos client, and add extra options suitable for running in
383
 
        the normal file system:
384
 
      </para>
385
 
      <para>
386
 
        
387
 
        <!-- do not wrap this line -->
388
 
        <userinput>&COMMANDNAME; --helper-directory=/usr/lib/x86_64-linux-gnu/mandos/plugin-helpers -- /usr/lib/x86_64-linux-gnu/mandos/plugins.d/mandos-client --pubkey=/etc/keys/mandos/pubkey.txt --seckey=/etc/keys/mandos/seckey.txt --tls-pubkey=/etc/keys/mandos/tls-pubkey.pem --tls-privkey=/etc/keys/mandos/tls-privkey.pem</userinput>
389
 
        
390
 
      </para>
391
 
    </informalexample>
392
 
    <informalexample>
393
 
      <para>
394
 
        Use the default location for
395
 
        <citerefentry><refentrytitle>mandos-client</refentrytitle>
396
 
        <manvolnum>8mandos</manvolnum></citerefentry>, but add many
397
 
        options to it:
398
 
      </para>
399
 
      <para>
400
 
 
401
 
<!-- do not wrap this line -->
402
 
<userinput>&COMMANDNAME; -- /lib/mandos/plugins.d/mandos-client --pubkey=/etc/mandos/keys/pubkey.txt --seckey=/etc/mandos/keys/seckey.txt --tls-pubkey=/etc/mandos/keys/tls-pubkey.pem --tls-privkey=/etc/mandos/keys/tls-privkey.pem</userinput>
403
 
 
404
 
      </para>
405
 
    </informalexample>
406
 
    <informalexample>
407
 
      <para>
408
 
        Only run the self-tests:
409
 
      </para>
410
 
      <para>
411
 
        <userinput>&COMMANDNAME; --test</userinput>
412
 
      </para>
413
 
    </informalexample>
414
 
  </refsect1>
415
 
  <refsect1 id="security">
416
 
    <title>SECURITY</title>
417
 
    <para>
418
 
      This program will need to run as the root user in order to read
419
 
      the agent directory and the <quote><filename
420
 
      >ask.<replaceable>xxxx</replaceable></filename></quote> files
421
 
      there, and will, when starting the Mandos client program,
422
 
      require the ability to set the <quote>real</quote> user and
423
 
      group ids to another user, by default user and group 65534,
424
 
      which are assumed to be non-privileged.  This is done in order
425
 
      to match the expectations of <citerefentry><refentrytitle
426
 
      >mandos-client</refentrytitle><manvolnum>8mandos</manvolnum
427
 
      ></citerefentry>, which assumes that its executable file is
428
 
      owned by the root user and also has the set-user-ID bit set (see
429
 
      <citerefentry><refentrytitle>execve</refentrytitle><manvolnum
430
 
      >2</manvolnum></citerefentry>).
431
 
    </para>
432
 
  </refsect1>
433
 
 
434
 
  <refsect1 id="see_also">
435
 
    <title>SEE ALSO</title>
436
 
    <para>
437
 
      <citerefentry><refentrytitle>intro</refentrytitle>
438
 
      <manvolnum>8mandos</manvolnum></citerefentry>,
439
 
      <citerefentry><refentrytitle>mandos-client</refentrytitle>
440
 
      <manvolnum>8mandos</manvolnum></citerefentry>,
441
 
      <citerefentry><refentrytitle>systemd</refentrytitle>
442
 
      <manvolnum>1</manvolnum></citerefentry>,
443
 
    </para>
444
 
    <variablelist>
445
 
      <varlistentry>
446
 
        <term>
447
 
          <ulink url="https://systemd.io/PASSWORD_AGENTS/">Password
448
 
          Agents</ulink>
449
 
        </term>
450
 
        <listitem>
451
 
          <para>
452
 
            The specification for systemd <quote>Password
453
 
            Agent</quote> programs, which
454
 
            <command>&COMMANDNAME;</command> follows.
455
 
          </para>
456
 
        </listitem>
457
 
      </varlistentry>
458
 
    </variablelist>
459
 
  </refsect1>
460
 
 
461
 
</refentry>
462
 
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