1
1
<?xml version="1.0" encoding="UTF-8"?>
2
2
<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
3
3
"http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
4
<!ENTITY VERSION "1.0">
4
5
<!ENTITY COMMANDNAME "mandos">
5
<!ENTITY TIMESTAMP "2012-01-01">
6
<!ENTITY % common SYSTEM "common.ent">
6
<!ENTITY TIMESTAMP "2008-08-31">
10
9
<refentry xmlns:xi="http://www.w3.org/2001/XInclude">
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>
39
34
<holder>Teddy Hogeborn</holder>
40
35
<holder>Björn Påhlsson</holder>
42
<xi:include href="legalnotice.xml"/>
39
This manual page is free software: you can redistribute it
40
and/or modify it under the terms of the GNU General Public
41
License as published by the Free Software Foundation,
42
either version 3 of the License, or (at your option) any
47
This manual page is distributed in the hope that it will
48
be useful, but WITHOUT ANY WARRANTY; without even the
49
implied warranty of MERCHANTABILITY or FITNESS FOR A
50
PARTICULAR PURPOSE. See the GNU General Public License
55
You should have received a copy of the GNU General Public
56
License along with this program; If not, see
57
<ulink url="http://www.gnu.org/licenses/"/>.
46
63
<refentrytitle>&COMMANDNAME;</refentrytitle>
47
64
<manvolnum>8</manvolnum>
88
105
<replaceable>DIRECTORY</replaceable></option></arg>
90
107
<arg><option>--debug</option></arg>
92
<arg><option>--debuglevel
93
<replaceable>LEVEL</replaceable></option></arg>
95
<arg><option>--no-dbus</option></arg>
97
<arg><option>--no-ipv6</option></arg>
99
<arg><option>--no-restore</option></arg>
101
<arg><option>--statedir
102
<replaceable>DIRECTORY</replaceable></option></arg>
105
110
<command>&COMMANDNAME;</command>
117
122
<arg choice="plain"><option>--check</option></arg>
119
124
</refsynopsisdiv>
121
126
<refsect1 id="description">
122
127
<title>DESCRIPTION</title>
124
129
<command>&COMMANDNAME;</command> is a server daemon which
125
130
handles incoming request for passwords for a pre-defined list of
126
client host computers. For an introduction, see
127
<citerefentry><refentrytitle>intro</refentrytitle>
128
<manvolnum>8mandos</manvolnum></citerefentry>. The Mandos server
129
uses Zeroconf to announce itself on the local network, and uses
130
TLS to communicate securely with and to authenticate the
131
clients. The Mandos server uses IPv6 to allow Mandos clients to
132
use IPv6 link-local addresses, since the clients will probably
133
not have any other addresses configured (see <xref
134
linkend="overview"/>). Any authenticated client is then given
135
the stored pre-encrypted password for that specific client.
131
client host computers. The Mandos server uses Zeroconf to
132
announce itself on the local network, and uses TLS to
133
communicate securely with and to authenticate the clients. The
134
Mandos server uses IPv6 to allow Mandos clients to use IPv6
135
link-local addresses, since the clients will probably not have
136
any other addresses configured (see <xref linkend="overview"/>).
137
Any authenticated client is then given the stored pre-encrypted
138
password for that specific client.
139
143
<refsect1 id="purpose">
140
144
<title>PURPOSE</title>
142
147
The purpose of this is to enable <emphasis>remote and unattended
143
148
rebooting</emphasis> of client host computer with an
144
149
<emphasis>encrypted root file system</emphasis>. See <xref
145
150
linkend="overview"/> for details.
149
155
<refsect1 id="options">
150
156
<title>OPTIONS</title>
153
160
<term><option>--help</option></term>
205
212
<xi:include href="mandos-options.xml" xpointer="debug"/>
210
<term><option>--debuglevel
211
<replaceable>LEVEL</replaceable></option></term>
214
Set the debugging log level.
215
<replaceable>LEVEL</replaceable> is a string, one of
216
<quote><literal>CRITICAL</literal></quote>,
217
<quote><literal>ERROR</literal></quote>,
218
<quote><literal>WARNING</literal></quote>,
219
<quote><literal>INFO</literal></quote>, or
220
<quote><literal>DEBUG</literal></quote>, in order of
221
increasing verbosity. The default level is
222
<quote><literal>WARNING</literal></quote>.
228
217
<term><option>--priority <replaceable>
229
218
PRIORITY</replaceable></option></term>
269
<term><option>--no-dbus</option></term>
271
<xi:include href="mandos-options.xml" xpointer="dbus"/>
273
See also <xref linkend="dbus_interface"/>.
279
<term><option>--no-ipv6</option></term>
281
<xi:include href="mandos-options.xml" xpointer="ipv6"/>
286
<term><option>--no-restore</option></term>
288
<xi:include href="mandos-options.xml" xpointer="restore"/>
290
See also <xref linkend="persistent_state"/>.
296
<term><option>--statedir
297
<replaceable>DIRECTORY</replaceable></option></term>
299
<xi:include href="mandos-options.xml" xpointer="statedir"/>
305
259
<refsect1 id="overview">
306
260
<title>OVERVIEW</title>
307
261
<xi:include href="overview.xml"/>
309
263
This program is the server part. It is a normal server program
310
264
and will run in a normal system environment, not in an initial
311
<acronym>RAM</acronym> disk environment.
265
RAM disk environment.
315
269
<refsect1 id="protocol">
316
270
<title>NETWORK PROTOCOL</title>
370
324
</tbody></tgroup></table>
373
327
<refsect1 id="checking">
374
328
<title>CHECKING</title>
376
330
The server will, by default, continually check that the clients
377
331
are still up. If a client has not been confirmed as being up
378
332
for some time, the client is assumed to be compromised and is no
379
longer eligible to receive the encrypted password. (Manual
380
intervention is required to re-enable a client.) The timeout,
381
extended timeout, checker program, and interval between checks
382
can be configured both globally and per client; see
383
<citerefentry><refentrytitle>mandos-clients.conf</refentrytitle>
384
<manvolnum>5</manvolnum></citerefentry>. A client successfully
385
receiving its password will also be treated as a successful
390
<refsect1 id="approval">
391
<title>APPROVAL</title>
393
The server can be configured to require manual approval for a
394
client before it is sent its secret. The delay to wait for such
395
approval and the default action (approve or deny) can be
396
configured both globally and per client; see <citerefentry>
333
longer eligible to receive the encrypted password. The timeout,
334
checker program, and interval between checks can be configured
335
both globally and per client; see <citerefentry>
397
336
<refentrytitle>mandos-clients.conf</refentrytitle>
398
<manvolnum>5</manvolnum></citerefentry>. By default all clients
399
will be approved immediately without delay.
402
This can be used to deny a client its secret if not manually
403
approved within a specified time. It can also be used to make
404
the server delay before giving a client its secret, allowing
405
optional manual denying of this specific client.
337
<manvolnum>5</manvolnum></citerefentry>.
410
341
<refsect1 id="logging">
411
342
<title>LOGGING</title>
413
344
The server will send log message with various severity levels to
414
<filename class="devicefile">/dev/log</filename>. With the
345
<filename>/dev/log</filename>. With the
415
346
<option>--debug</option> option, it will log even more messages,
416
347
and also show them on the console.
420
<refsect1 id="persistent_state">
421
<title>PERSISTENT STATE</title>
423
Client settings, initially read from
424
<filename>clients.conf</filename>, are persistent across
425
restarts, and run-time changes will override settings in
426
<filename>clients.conf</filename>. However, if a setting is
427
<emphasis>changed</emphasis> (or a client added, or removed) in
428
<filename>clients.conf</filename>, this will take precedence.
432
<refsect1 id="dbus_interface">
433
<title>D-BUS INTERFACE</title>
435
The server will by default provide a D-Bus system bus interface.
436
This interface will only be accessible by the root user or a
437
Mandos-specific user, if such a user exists. For documentation
438
of the D-Bus API, see the file <filename>DBUS-API</filename>.
442
351
<refsect1 id="exit_status">
443
352
<title>EXIT STATUS</title>
499
<term><filename>/var/run/mandos.pid</filename></term>
502
The file containing the process id of the
503
<command>&COMMANDNAME;</command> process started last.
508
<term><filename class="devicefile">/dev/log</filename></term>
512
class="directory">/var/lib/mandos</filename></term>
515
Directory where persistent state will be saved. Change
516
this with the <option>--statedir</option> option. See
517
also the <option>--no-restore</option> option.
408
<term><filename>/var/run/mandos/mandos.pid</filename></term>
411
The file containing the process id of
412
<command>&COMMANDNAME;</command>.
548
443
backtrace. This could be considered a feature.
446
Currently, if a client is declared <quote>invalid</quote> due to
447
having timed out, the server does not record this fact onto
448
permanent storage. This has some security implications, see
449
<xref linkend="CLIENTS"/>.
452
There is currently no way of querying the server of the current
453
status of clients, other than analyzing its <systemitem
454
class="service">syslog</systemitem> output.
551
457
There is no fine-grained control over logging and debug output.
554
460
Debug mode is conflated with running in the foreground.
557
This server does not check the expire time of clients’ OpenPGP
463
The console log messages does not show a timestamp.
572
477
<informalexample>
574
479
Run the server in debug mode, read configuration files from
575
the <filename class="directory">~/mandos</filename> directory,
576
and use the Zeroconf service name <quote>Test</quote> to not
577
collide with any other official Mandos server on this host:
480
the <filename>~/mandos</filename> directory, and use the
481
Zeroconf service name <quote>Test</quote> to not collide with
482
any other official Mandos server on this host:
629
534
compromised if they are gone for too long.
537
If a client is compromised, its downtime should be duly noted
538
by the server which would therefore declare the client
539
invalid. But if the server was ever restarted, it would
540
re-read its client list from its configuration file and again
541
regard all clients therein as valid, and hence eligible to
542
receive their passwords. Therefore, be careful when
543
restarting servers if it is suspected that a client has, in
544
fact, been compromised by parties who may now be running a
545
fake Mandos client with the keys from the non-encrypted
546
initial RAM image of the client host. What should be done in
547
that case (if restarting the server program really is
548
necessary) is to stop the server program, edit the
549
configuration file to omit any suspect clients, and restart
632
553
For more details on client-side security, see
633
<citerefentry><refentrytitle>mandos-client</refentrytitle>
554
<citerefentry><refentrytitle>password-request</refentrytitle>
634
555
<manvolnum>8mandos</manvolnum></citerefentry>.
639
560
<refsect1 id="see_also">
640
561
<title>SEE ALSO</title>
642
<citerefentry><refentrytitle>intro</refentrytitle>
643
<manvolnum>8mandos</manvolnum></citerefentry>,
644
<citerefentry><refentrytitle>mandos-clients.conf</refentrytitle>
645
<manvolnum>5</manvolnum></citerefentry>,
646
<citerefentry><refentrytitle>mandos.conf</refentrytitle>
647
<manvolnum>5</manvolnum></citerefentry>,
648
<citerefentry><refentrytitle>mandos-client</refentrytitle>
649
<manvolnum>8mandos</manvolnum></citerefentry>,
650
<citerefentry><refentrytitle>sh</refentrytitle>
651
<manvolnum>1</manvolnum></citerefentry>
564
<refentrytitle>mandos-clients.conf</refentrytitle>
565
<manvolnum>5</manvolnum></citerefentry>, <citerefentry>
566
<refentrytitle>mandos.conf</refentrytitle>
567
<manvolnum>5</manvolnum></citerefentry>, <citerefentry>
568
<refentrytitle>password-request</refentrytitle>
569
<manvolnum>8mandos</manvolnum></citerefentry>, <citerefentry>
570
<refentrytitle>sh</refentrytitle><manvolnum>1</manvolnum>