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">
5
4
<!ENTITY COMMANDNAME "mandos">
6
<!ENTITY TIMESTAMP "2008-09-01">
5
<!ENTITY TIMESTAMP "2016-07-03">
6
<!ENTITY % common SYSTEM "common.ent">
9
10
<refentry xmlns:xi="http://www.w3.org/2001/XInclude">
11
12
<title>Mandos Manual</title>
12
13
<!-- NWalsh’s docbook scripts use this to generate the footer: -->
13
14
<productname>Mandos</productname>
14
<productnumber>&VERSION;</productnumber>
15
<productnumber>&version;</productnumber>
15
16
<date>&TIMESTAMP;</date>
18
19
<firstname>Björn</firstname>
19
20
<surname>Påhlsson</surname>
21
<email>belorn@fukt.bsnet.se</email>
22
<email>belorn@recompile.se</email>
25
26
<firstname>Teddy</firstname>
26
27
<surname>Hogeborn</surname>
28
<email>teddy@fukt.bsnet.se</email>
29
<email>teddy@recompile.se</email>
34
43
<holder>Teddy Hogeborn</holder>
35
44
<holder>Björn Påhlsson</holder>
37
46
<xi:include href="legalnotice.xml"/>
41
50
<refentrytitle>&COMMANDNAME;</refentrytitle>
42
51
<manvolnum>8</manvolnum>
83
92
<replaceable>DIRECTORY</replaceable></option></arg>
85
94
<arg><option>--debug</option></arg>
96
<arg><option>--debuglevel
97
<replaceable>LEVEL</replaceable></option></arg>
99
<arg><option>--no-dbus</option></arg>
101
<arg><option>--no-ipv6</option></arg>
103
<arg><option>--no-restore</option></arg>
105
<arg><option>--statedir
106
<replaceable>DIRECTORY</replaceable></option></arg>
108
<arg><option>--socket
109
<replaceable>FD</replaceable></option></arg>
111
<arg><option>--foreground</option></arg>
113
<arg><option>--no-zeroconf</option></arg>
88
116
<command>&COMMANDNAME;</command>
100
128
<arg choice="plain"><option>--check</option></arg>
102
130
</refsynopsisdiv>
104
132
<refsect1 id="description">
105
133
<title>DESCRIPTION</title>
107
135
<command>&COMMANDNAME;</command> is a server daemon which
108
136
handles incoming request for passwords for a pre-defined list of
109
client host computers. The Mandos server uses Zeroconf to
110
announce itself on the local network, and uses TLS to
111
communicate securely with and to authenticate the clients. The
112
Mandos server uses IPv6 to allow Mandos clients to use IPv6
113
link-local addresses, since the clients will probably not have
114
any other addresses configured (see <xref linkend="overview"/>).
115
Any authenticated client is then given the stored pre-encrypted
116
password for that specific client.
137
client host computers. For an introduction, see
138
<citerefentry><refentrytitle>intro</refentrytitle>
139
<manvolnum>8mandos</manvolnum></citerefentry>. The Mandos server
140
uses Zeroconf to announce itself on the local network, and uses
141
TLS to communicate securely with and to authenticate the
142
clients. The Mandos server uses IPv6 to allow Mandos clients to
143
use IPv6 link-local addresses, since the clients will probably
144
not have any other addresses configured (see <xref
145
linkend="overview"/>). Any authenticated client is then given
146
the stored pre-encrypted password for that specific client.
121
150
<refsect1 id="purpose">
122
151
<title>PURPOSE</title>
125
153
The purpose of this is to enable <emphasis>remote and unattended
126
154
rebooting</emphasis> of client host computer with an
127
155
<emphasis>encrypted root file system</emphasis>. See <xref
128
156
linkend="overview"/> for details.
133
160
<refsect1 id="options">
134
161
<title>OPTIONS</title>
138
164
<term><option>--help</option></term>
190
216
<xi:include href="mandos-options.xml" xpointer="debug"/>
221
<term><option>--debuglevel
222
<replaceable>LEVEL</replaceable></option></term>
225
Set the debugging log level.
226
<replaceable>LEVEL</replaceable> is a string, one of
227
<quote><literal>CRITICAL</literal></quote>,
228
<quote><literal>ERROR</literal></quote>,
229
<quote><literal>WARNING</literal></quote>,
230
<quote><literal>INFO</literal></quote>, or
231
<quote><literal>DEBUG</literal></quote>, in order of
232
increasing verbosity. The default level is
233
<quote><literal>WARNING</literal></quote>.
195
239
<term><option>--priority <replaceable>
196
240
PRIORITY</replaceable></option></term>
280
<term><option>--no-dbus</option></term>
282
<xi:include href="mandos-options.xml" xpointer="dbus"/>
284
See also <xref linkend="dbus_interface"/>.
290
<term><option>--no-ipv6</option></term>
292
<xi:include href="mandos-options.xml" xpointer="ipv6"/>
297
<term><option>--no-restore</option></term>
299
<xi:include href="mandos-options.xml" xpointer="restore"/>
301
See also <xref linkend="persistent_state"/>.
307
<term><option>--statedir
308
<replaceable>DIRECTORY</replaceable></option></term>
310
<xi:include href="mandos-options.xml" xpointer="statedir"/>
315
<term><option>--socket
316
<replaceable>FD</replaceable></option></term>
318
<xi:include href="mandos-options.xml" xpointer="socket"/>
323
<term><option>--foreground</option></term>
325
<xi:include href="mandos-options.xml"
326
xpointer="foreground"/>
331
<term><option>--no-zeroconf</option></term>
333
<xi:include href="mandos-options.xml" xpointer="zeroconf"/>
237
340
<refsect1 id="overview">
238
341
<title>OVERVIEW</title>
239
342
<xi:include href="overview.xml"/>
302
405
</tbody></tgroup></table>
305
408
<refsect1 id="checking">
306
409
<title>CHECKING</title>
308
411
The server will, by default, continually check that the clients
309
412
are still up. If a client has not been confirmed as being up
310
413
for some time, the client is assumed to be compromised and is no
311
longer eligible to receive the encrypted password. The timeout,
312
checker program, and interval between checks can be configured
313
both globally and per client; see <citerefentry>
414
longer eligible to receive the encrypted password. (Manual
415
intervention is required to re-enable a client.) The timeout,
416
extended timeout, checker program, and interval between checks
417
can be configured both globally and per client; see
418
<citerefentry><refentrytitle>mandos-clients.conf</refentrytitle>
419
<manvolnum>5</manvolnum></citerefentry>.
423
<refsect1 id="approval">
424
<title>APPROVAL</title>
426
The server can be configured to require manual approval for a
427
client before it is sent its secret. The delay to wait for such
428
approval and the default action (approve or deny) can be
429
configured both globally and per client; see <citerefentry>
314
430
<refentrytitle>mandos-clients.conf</refentrytitle>
315
<manvolnum>5</manvolnum></citerefentry>.
431
<manvolnum>5</manvolnum></citerefentry>. By default all clients
432
will be approved immediately without delay.
435
This can be used to deny a client its secret if not manually
436
approved within a specified time. It can also be used to make
437
the server delay before giving a client its secret, allowing
438
optional manual denying of this specific client.
319
443
<refsect1 id="logging">
320
444
<title>LOGGING</title>
322
446
The server will send log message with various severity levels to
323
<filename>/dev/log</filename>. With the
447
<filename class="devicefile">/dev/log</filename>. With the
324
448
<option>--debug</option> option, it will log even more messages,
325
449
and also show them on the console.
453
<refsect1 id="persistent_state">
454
<title>PERSISTENT STATE</title>
456
Client settings, initially read from
457
<filename>clients.conf</filename>, are persistent across
458
restarts, and run-time changes will override settings in
459
<filename>clients.conf</filename>. However, if a setting is
460
<emphasis>changed</emphasis> (or a client added, or removed) in
461
<filename>clients.conf</filename>, this will take precedence.
465
<refsect1 id="dbus_interface">
466
<title>D-BUS INTERFACE</title>
468
The server will by default provide a D-Bus system bus interface.
469
This interface will only be accessible by the root user or a
470
Mandos-specific user, if such a user exists. For documentation
471
of the D-Bus API, see the file <filename>DBUS-API</filename>.
329
475
<refsect1 id="exit_status">
330
476
<title>EXIT STATUS</title>
386
<term><filename>/var/run/mandos/mandos.pid</filename></term>
389
The file containing the process id of
390
<command>&COMMANDNAME;</command>.
395
<term><filename>/dev/log</filename></term>
532
<term><filename>/run/mandos.pid</filename></term>
535
The file containing the process id of the
536
<command>&COMMANDNAME;</command> process started last.
537
<emphasis >Note:</emphasis> If the <filename
538
class="directory">/run</filename> directory does not
539
exist, <filename>/var/run/mandos.pid</filename> will be
546
class="directory">/var/lib/mandos</filename></term>
549
Directory where persistent state will be saved. Change
550
this with the <option>--statedir</option> option. See
551
also the <option>--no-restore</option> option.
556
<term><filename class="devicefile">/dev/log</filename></term>
398
559
The Unix domain socket to where local syslog messages are
421
582
backtrace. This could be considered a feature.
424
Currently, if a client is declared <quote>invalid</quote> due to
425
having timed out, the server does not record this fact onto
426
permanent storage. This has some security implications, see
427
<xref linkend="CLIENTS"/>.
430
There is currently no way of querying the server of the current
431
status of clients, other than analyzing its <systemitem
432
class="service">syslog</systemitem> output.
435
585
There is no fine-grained control over logging and debug output.
438
Debug mode is conflated with running in the foreground.
441
The console log messages does not show a timestamp.
588
This server does not check the expire time of clients’ OpenPGP
591
<xi:include href="bugs.xml"/>
445
594
<refsect1 id="example">
455
604
<informalexample>
457
606
Run the server in debug mode, read configuration files from
458
the <filename>~/mandos</filename> directory, and use the
459
Zeroconf service name <quote>Test</quote> to not collide with
460
any other official Mandos server on this host:
607
the <filename class="directory">~/mandos</filename> directory,
608
and use the Zeroconf service name <quote>Test</quote> to not
609
collide with any other official Mandos server on this host:
512
661
compromised if they are gone for too long.
515
If a client is compromised, its downtime should be duly noted
516
by the server which would therefore declare the client
517
invalid. But if the server was ever restarted, it would
518
re-read its client list from its configuration file and again
519
regard all clients therein as valid, and hence eligible to
520
receive their passwords. Therefore, be careful when
521
restarting servers if it is suspected that a client has, in
522
fact, been compromised by parties who may now be running a
523
fake Mandos client with the keys from the non-encrypted
524
initial <acronym>RAM</acronym> image of the client host. What
525
should be done in that case (if restarting the server program
526
really is necessary) is to stop the server program, edit the
527
configuration file to omit any suspect clients, and restart
531
664
For more details on client-side security, see
532
<citerefentry><refentrytitle>password-request</refentrytitle>
665
<citerefentry><refentrytitle>mandos-client</refentrytitle>
533
666
<manvolnum>8mandos</manvolnum></citerefentry>.
538
671
<refsect1 id="see_also">
539
672
<title>SEE ALSO</title>
542
<refentrytitle>mandos-clients.conf</refentrytitle>
543
<manvolnum>5</manvolnum></citerefentry>, <citerefentry>
544
<refentrytitle>mandos.conf</refentrytitle>
545
<manvolnum>5</manvolnum></citerefentry>, <citerefentry>
546
<refentrytitle>password-request</refentrytitle>
547
<manvolnum>8mandos</manvolnum></citerefentry>, <citerefentry>
548
<refentrytitle>sh</refentrytitle><manvolnum>1</manvolnum>
674
<citerefentry><refentrytitle>intro</refentrytitle>
675
<manvolnum>8mandos</manvolnum></citerefentry>,
676
<citerefentry><refentrytitle>mandos-clients.conf</refentrytitle>
677
<manvolnum>5</manvolnum></citerefentry>,
678
<citerefentry><refentrytitle>mandos.conf</refentrytitle>
679
<manvolnum>5</manvolnum></citerefentry>,
680
<citerefentry><refentrytitle>mandos-client</refentrytitle>
681
<manvolnum>8mandos</manvolnum></citerefentry>,
682
<citerefentry><refentrytitle>sh</refentrytitle>
683
<manvolnum>1</manvolnum></citerefentry>