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 OVERVIEW SYSTEM "overview.xml">
5
<!ENTITY TIMESTAMP "2015-07-20">
6
<!ENTITY % common SYSTEM "common.ent">
11
<title>&COMMANDNAME;</title>
10
<refentry xmlns:xi="http://www.w3.org/2001/XInclude">
12
<title>Mandos Manual</title>
12
13
<!-- NWalsh’s docbook scripts use this to generate the footer: -->
13
<productname>&COMMANDNAME;</productname>
14
<productnumber>&VERSION;</productnumber>
14
<productname>Mandos</productname>
15
<productnumber>&version;</productnumber>
16
<date>&TIMESTAMP;</date>
17
19
<firstname>Björn</firstname>
18
20
<surname>Påhlsson</surname>
20
<email>belorn@fukt.bsnet.se</email>
22
<email>belorn@recompile.se</email>
24
26
<firstname>Teddy</firstname>
25
27
<surname>Hogeborn</surname>
27
<email>teddy@fukt.bsnet.se</email>
29
<email>teddy@recompile.se</email>
33
40
<holder>Teddy Hogeborn</holder>
34
41
<holder>Björn Påhlsson</holder>
38
This manual page is free software: you can redistribute it
39
and/or modify it under the terms of the GNU General Public
40
License as published by the Free Software Foundation,
41
either version 3 of the License, or (at your option) any
46
This manual page is distributed in the hope that it will
47
be useful, but WITHOUT ANY WARRANTY; without even the
48
implied warranty of MERCHANTABILITY or FITNESS FOR A
49
PARTICULAR PURPOSE. See the GNU General Public License
54
You should have received a copy of the GNU General Public
55
License along with this program; If not, see
56
<ulink url="http://www.gnu.org/licenses/"/>.
43
<xi:include href="legalnotice.xml"/>
62
47
<refentrytitle>&COMMANDNAME;</refentrytitle>
63
48
<manvolnum>8</manvolnum>
67
52
<refname><command>&COMMANDNAME;</command></refname>
69
Sends encrypted passwords to authenticated Mandos clients
54
Gives encrypted passwords to authenticated Mandos clients
75
60
<command>&COMMANDNAME;</command>
76
<arg>--interface<arg choice="plain">IF</arg></arg>
77
<arg>--address<arg choice="plain">ADDRESS</arg></arg>
78
<arg>--port<arg choice="plain">PORT</arg></arg>
79
<arg>--priority<arg choice="plain">PRIORITY</arg></arg>
80
<arg>--servicename<arg choice="plain">NAME</arg></arg>
81
<arg>--configdir<arg choice="plain">DIRECTORY</arg></arg>
85
<command>&COMMANDNAME;</command>
86
<arg>-i<arg choice="plain">IF</arg></arg>
87
<arg>-a<arg choice="plain">ADDRESS</arg></arg>
88
<arg>-p<arg choice="plain">PORT</arg></arg>
89
<arg>--priority<arg choice="plain">PRIORITY</arg></arg>
90
<arg>--servicename<arg choice="plain">NAME</arg></arg>
91
<arg>--configdir<arg choice="plain">DIRECTORY</arg></arg>
62
<arg choice="plain"><option>--interface
63
<replaceable>NAME</replaceable></option></arg>
64
<arg choice="plain"><option>-i
65
<replaceable>NAME</replaceable></option></arg>
69
<arg choice="plain"><option>--address
70
<replaceable>ADDRESS</replaceable></option></arg>
71
<arg choice="plain"><option>-a
72
<replaceable>ADDRESS</replaceable></option></arg>
76
<arg choice="plain"><option>--port
77
<replaceable>PORT</replaceable></option></arg>
78
<arg choice="plain"><option>-p
79
<replaceable>PORT</replaceable></option></arg>
82
<arg><option>--priority
83
<replaceable>PRIORITY</replaceable></option></arg>
85
<arg><option>--servicename
86
<replaceable>NAME</replaceable></option></arg>
88
<arg><option>--configdir
89
<replaceable>DIRECTORY</replaceable></option></arg>
91
<arg><option>--debug</option></arg>
93
<arg><option>--debuglevel
94
<replaceable>LEVEL</replaceable></option></arg>
96
<arg><option>--no-dbus</option></arg>
98
<arg><option>--no-ipv6</option></arg>
100
<arg><option>--no-restore</option></arg>
102
<arg><option>--statedir
103
<replaceable>DIRECTORY</replaceable></option></arg>
105
<arg><option>--socket
106
<replaceable>FD</replaceable></option></arg>
108
<arg><option>--foreground</option></arg>
110
<arg><option>--no-zeroconf</option></arg>
95
113
<command>&COMMANDNAME;</command>
96
114
<group choice="req">
97
<arg choice="plain">-h</arg>
98
<arg choice="plain">--help</arg>
115
<arg choice="plain"><option>--help</option></arg>
116
<arg choice="plain"><option>-h</option></arg>
102
120
<command>&COMMANDNAME;</command>
103
<arg choice="plain">--version</arg>
121
<arg choice="plain"><option>--version</option></arg>
106
124
<command>&COMMANDNAME;</command>
107
<arg choice="plain">--check</arg>
125
<arg choice="plain"><option>--check</option></arg>
109
127
</refsynopsisdiv>
111
129
<refsect1 id="description">
112
130
<title>DESCRIPTION</title>
114
132
<command>&COMMANDNAME;</command> is a server daemon which
115
133
handles incoming request for passwords for a pre-defined list of
116
client host computers. The Mandos server uses Zeroconf to
117
announce itself on the local network, and uses TLS to
118
communicate securely with and to authenticate the clients. The
119
Mandos server uses IPv6 to allow Mandos clients to use IPv6
120
link-local addresses, since the clients will probably not have
121
any other addresses configured (see <xref linkend="overview"/>).
122
Any authenticated client is then given the stored pre-encrypted
123
password for that specific client.
134
client host computers. For an introduction, see
135
<citerefentry><refentrytitle>intro</refentrytitle>
136
<manvolnum>8mandos</manvolnum></citerefentry>. The Mandos server
137
uses Zeroconf to announce itself on the local network, and uses
138
TLS to communicate securely with and to authenticate the
139
clients. The Mandos server uses IPv6 to allow Mandos clients to
140
use IPv6 link-local addresses, since the clients will probably
141
not have any other addresses configured (see <xref
142
linkend="overview"/>). Any authenticated client is then given
143
the stored pre-encrypted password for that specific client.
128
147
<refsect1 id="purpose">
129
148
<title>PURPOSE</title>
132
150
The purpose of this is to enable <emphasis>remote and unattended
133
151
rebooting</emphasis> of client host computer with an
134
152
<emphasis>encrypted root file system</emphasis>. See <xref
135
153
linkend="overview"/> for details.
140
157
<refsect1 id="options">
141
158
<title>OPTIONS</title>
145
<term><literal>-h</literal>, <literal>--help</literal></term>
161
<term><option>--help</option></term>
162
<term><option>-h</option></term>
148
165
Show a help message and exit
154
<term><literal>-i</literal>, <literal>--interface <replaceable>
155
IF</replaceable></literal></term>
158
Only announce the server and listen to requests on network
159
interface <replaceable>IF</replaceable>. Default is to
160
use all available interfaces. <emphasis>Note:</emphasis>
161
a failure to bind to the specified interface is not
162
considered critical, and the server does not exit.
168
<term><literal>-a</literal>, <literal>--address <replaceable>
169
ADDRESS</replaceable></literal></term>
172
If this option is used, the server will only listen to a
173
specific address. This must currently be an IPv6 address;
174
an IPv4 address can be specified using the
175
<quote><literal>::FFFF:192.0.2.3</literal></quote> syntax.
176
Also, if a link-local address is specified, an interface
177
should be set, since a link-local address is only valid on
178
a single interface. By default, the server will listen to
179
all available addresses.
185
<term><literal>-p</literal>, <literal>--port <replaceable>
186
PORT</replaceable></literal></term>
189
If this option is used, the server to bind to that
190
port. By default, the server will listen to an arbitrary
191
port given by the operating system.
197
<term><literal>--check</literal></term>
171
<term><option>--interface</option>
172
<replaceable>NAME</replaceable></term>
173
<term><option>-i</option>
174
<replaceable>NAME</replaceable></term>
176
<xi:include href="mandos-options.xml" xpointer="interface"/>
181
<term><option>--address
182
<replaceable>ADDRESS</replaceable></option></term>
184
<replaceable>ADDRESS</replaceable></option></term>
186
<xi:include href="mandos-options.xml" xpointer="address"/>
192
<replaceable>PORT</replaceable></option></term>
194
<replaceable>PORT</replaceable></option></term>
196
<xi:include href="mandos-options.xml" xpointer="port"/>
201
<term><option>--check</option></term>
200
204
Run the server’s self-tests. This includes any unit
207
<term><literal>--debug</literal></term>
210
If the server is run in debug mode, it will run in the
211
foreground and print a lot of debugging information. The
212
default is <emphasis>not</emphasis> to run in debug mode.
218
<term><literal>--priority <replaceable>
219
PRIORITY</replaceable></literal></term>
222
GnuTLS priority string for the TLS handshake with the
223
clients. The default is
224
<quote><literal>SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP</literal></quote>.
225
See <citerefentry><refentrytitle>gnutls_priority_init
226
</refentrytitle><manvolnum>3</manvolnum></citerefentry>
227
for the syntax. <emphasis>Warning</emphasis>: changing
228
this may make the TLS handshake fail, making communication
229
with clients impossible.
235
<term><literal>--servicename <replaceable>NAME</replaceable>
239
Zeroconf service name. The default is
240
<quote><literal>Mandos</literal></quote>. This only needs
241
to be changed this if it, for some reason, is necessary to
242
run more than one server on the same
243
<emphasis>host</emphasis>, which would not normally be
244
useful. If there are name collisions on the same
245
<emphasis>network</emphasis>, the newer server will
246
automatically rename itself to <quote><literal>Mandos
247
#2</literal></quote>, and so on; therefore, this option is
248
not needed in that case.
254
<term><literal>--configdir <replaceable>DIR</replaceable>
211
<term><option>--debug</option></term>
213
<xi:include href="mandos-options.xml" xpointer="debug"/>
218
<term><option>--debuglevel
219
<replaceable>LEVEL</replaceable></option></term>
222
Set the debugging log level.
223
<replaceable>LEVEL</replaceable> is a string, one of
224
<quote><literal>CRITICAL</literal></quote>,
225
<quote><literal>ERROR</literal></quote>,
226
<quote><literal>WARNING</literal></quote>,
227
<quote><literal>INFO</literal></quote>, or
228
<quote><literal>DEBUG</literal></quote>, in order of
229
increasing verbosity. The default level is
230
<quote><literal>WARNING</literal></quote>.
236
<term><option>--priority <replaceable>
237
PRIORITY</replaceable></option></term>
239
<xi:include href="mandos-options.xml" xpointer="priority"/>
244
<term><option>--servicename
245
<replaceable>NAME</replaceable></option></term>
247
<xi:include href="mandos-options.xml"
248
xpointer="servicename"/>
253
<term><option>--configdir
254
<replaceable>DIRECTORY</replaceable></option></term>
258
257
Directory to search for configuration files. Default is
269
<term><literal>--version</literal></term>
268
<term><option>--version</option></term>
272
271
Prints the program version and exit.
277
<term><option>--no-dbus</option></term>
279
<xi:include href="mandos-options.xml" xpointer="dbus"/>
281
See also <xref linkend="dbus_interface"/>.
287
<term><option>--no-ipv6</option></term>
289
<xi:include href="mandos-options.xml" xpointer="ipv6"/>
294
<term><option>--no-restore</option></term>
296
<xi:include href="mandos-options.xml" xpointer="restore"/>
298
See also <xref linkend="persistent_state"/>.
304
<term><option>--statedir
305
<replaceable>DIRECTORY</replaceable></option></term>
307
<xi:include href="mandos-options.xml" xpointer="statedir"/>
312
<term><option>--socket
313
<replaceable>FD</replaceable></option></term>
315
<xi:include href="mandos-options.xml" xpointer="socket"/>
320
<term><option>--foreground</option></term>
322
<xi:include href="mandos-options.xml"
323
xpointer="foreground"/>
328
<term><option>--no-zeroconf</option></term>
330
<xi:include href="mandos-options.xml" xpointer="zeroconf"/>
279
337
<refsect1 id="overview">
280
338
<title>OVERVIEW</title>
339
<xi:include href="overview.xml"/>
283
341
This program is the server part. It is a normal server program
284
342
and will run in a normal system environment, not in an initial
285
RAM disk environment.
343
<acronym>RAM</acronym> disk environment.
289
347
<refsect1 id="protocol">
290
348
<title>NETWORK PROTOCOL</title>
344
402
</tbody></tgroup></table>
347
405
<refsect1 id="checking">
348
406
<title>CHECKING</title>
350
408
The server will, by default, continually check that the clients
351
409
are still up. If a client has not been confirmed as being up
352
410
for some time, the client is assumed to be compromised and is no
353
longer eligible to receive the encrypted password. The timeout,
354
checker program, and interval between checks can be configured
355
both globally and per client; see <citerefentry>
356
<refentrytitle>mandos.conf</refentrytitle>
357
<manvolnum>5</manvolnum></citerefentry> and <citerefentry>
411
longer eligible to receive the encrypted password. (Manual
412
intervention is required to re-enable a client.) The timeout,
413
extended timeout, checker program, and interval between checks
414
can be configured both globally and per client; see
415
<citerefentry><refentrytitle>mandos-clients.conf</refentrytitle>
416
<manvolnum>5</manvolnum></citerefentry>.
420
<refsect1 id="approval">
421
<title>APPROVAL</title>
423
The server can be configured to require manual approval for a
424
client before it is sent its secret. The delay to wait for such
425
approval and the default action (approve or deny) can be
426
configured both globally and per client; see <citerefentry>
358
427
<refentrytitle>mandos-clients.conf</refentrytitle>
359
<manvolnum>5</manvolnum></citerefentry>.
428
<manvolnum>5</manvolnum></citerefentry>. By default all clients
429
will be approved immediately without delay.
432
This can be used to deny a client its secret if not manually
433
approved within a specified time. It can also be used to make
434
the server delay before giving a client its secret, allowing
435
optional manual denying of this specific client.
363
440
<refsect1 id="logging">
364
441
<title>LOGGING</title>
366
The server will send log messaged with various severity levels
367
to <filename>/dev/log</filename>. With the
443
The server will send log message with various severity levels to
444
<filename class="devicefile">/dev/log</filename>. With the
368
445
<option>--debug</option> option, it will log even more messages,
369
446
and also show them on the console.
450
<refsect1 id="persistent_state">
451
<title>PERSISTENT STATE</title>
453
Client settings, initially read from
454
<filename>clients.conf</filename>, are persistent across
455
restarts, and run-time changes will override settings in
456
<filename>clients.conf</filename>. However, if a setting is
457
<emphasis>changed</emphasis> (or a client added, or removed) in
458
<filename>clients.conf</filename>, this will take precedence.
462
<refsect1 id="dbus_interface">
463
<title>D-BUS INTERFACE</title>
465
The server will by default provide a D-Bus system bus interface.
466
This interface will only be accessible by the root user or a
467
Mandos-specific user, if such a user exists. For documentation
468
of the D-Bus API, see the file <filename>DBUS-API</filename>.
373
472
<refsect1 id="exit_status">
374
473
<title>EXIT STATUS</title>
556
660
compromised if they are gone for too long.
559
If a client is compromised, its downtime should be duly noted
560
by the server which would therefore declare the client
561
invalid. But if the server was ever restarted, it would
562
re-read its client list from its configuration file and again
563
regard all clients therein as valid, and hence eligible to
564
receive their passwords. Therefore, be careful when
565
restarting servers if it is suspected that a client has, in
566
fact, been compromised by parties who may now be running a
567
fake Mandos client with the keys from the non-encrypted
568
initial RAM image of the client host. What should be done in
569
that case (if restarting the server program really is
570
necessary) is to stop the server program, edit the
571
configuration file to omit any suspect clients, and restart
575
663
For more details on client-side security, see
576
<citerefentry><refentrytitle>password-request</refentrytitle>
664
<citerefentry><refentrytitle>mandos-client</refentrytitle>
577
665
<manvolnum>8mandos</manvolnum></citerefentry>.
582
670
<refsect1 id="see_also">
583
671
<title>SEE ALSO</title>
673
<citerefentry><refentrytitle>intro</refentrytitle>
674
<manvolnum>8mandos</manvolnum></citerefentry>,
675
<citerefentry><refentrytitle>mandos-clients.conf</refentrytitle>
676
<manvolnum>5</manvolnum></citerefentry>,
677
<citerefentry><refentrytitle>mandos.conf</refentrytitle>
678
<manvolnum>5</manvolnum></citerefentry>,
679
<citerefentry><refentrytitle>mandos-client</refentrytitle>
680
<manvolnum>8mandos</manvolnum></citerefentry>,
681
<citerefentry><refentrytitle>sh</refentrytitle>
682
<manvolnum>1</manvolnum></citerefentry>
588
<refentrytitle>password-request</refentrytitle>
589
<manvolnum>8mandos</manvolnum>
594
This is the actual program which talks to this server.
595
Note that it is normally not invoked directly, and is only
596
run in the initial RAM disk environment, and not on a
597
fully started system.
603
687
<ulink url="http://www.zeroconf.org/">Zeroconf</ulink>
638
<citation>RFC 4291: <citetitle>IP Version 6 Addressing
639
Architecture</citetitle>, section 2.5.6, Link-Local IPv6
640
Unicast Addresses</citation>
721
RFC 4291: <citetitle>IP Version 6 Addressing
722
Architecture</citetitle>
644
The clients use IPv6 link-local addresses, which are
645
immediately usable since a link-local addresses is
646
automatically assigned to a network interfaces when it is
727
<term>Section 2.2: <citetitle>Text Representation of
728
Addresses</citetitle></term>
729
<listitem><para/></listitem>
732
<term>Section 2.5.5.2: <citetitle>IPv4-Mapped IPv6
733
Address</citetitle></term>
734
<listitem><para/></listitem>
737
<term>Section 2.5.6, <citetitle>Link-Local IPv6 Unicast
738
Addresses</citetitle></term>
741
The clients use IPv6 link-local addresses, which are
742
immediately usable since a link-local addresses is
743
automatically assigned to a network interfaces when it
653
<citation>RFC 4346: <citetitle>The Transport Layer Security
654
(TLS) Protocol Version 1.1</citetitle></citation>
753
RFC 5246: <citetitle>The Transport Layer Security (TLS)
754
Protocol Version 1.2</citetitle>
658
TLS 1.1 is the protocol implemented by GnuTLS.
758
TLS 1.2 is the protocol implemented by GnuTLS.
664
<citation>RFC 4880: <citetitle>OpenPGP Message
665
Format</citetitle></citation>
764
RFC 4880: <citetitle>OpenPGP Message Format</citetitle>