67
50
<refname><command>&COMMANDNAME;</command></refname>
69
Sends encrypted passwords to authenticated Mandos clients
52
Gives encrypted passwords to authenticated Mandos clients
75
58
<command>&COMMANDNAME;</command>
76
<arg choice="opt">--interface<arg choice="plain">IF</arg></arg>
77
<arg choice="opt">--address<arg choice="plain">ADDRESS</arg></arg>
78
<arg choice="opt">--port<arg choice="plain">PORT</arg></arg>
79
<arg choice="opt">--priority<arg choice="plain">PRIORITY</arg></arg>
80
<arg choice="opt">--servicename<arg choice="plain">NAME</arg></arg>
81
<arg choice="opt">--configdir<arg choice="plain">DIRECTORY</arg></arg>
82
<arg choice="opt">--debug</arg>
85
<command>&COMMANDNAME;</command>
86
<arg choice="opt">-i<arg choice="plain">IF</arg></arg>
87
<arg choice="opt">-a<arg choice="plain">ADDRESS</arg></arg>
88
<arg choice="opt">-p<arg choice="plain">PORT</arg></arg>
89
<arg choice="opt">--priority<arg choice="plain">PRIORITY</arg></arg>
90
<arg choice="opt">--servicename<arg choice="plain">NAME</arg></arg>
91
<arg choice="opt">--configdir<arg choice="plain">DIRECTORY</arg></arg>
92
<arg choice="opt">--debug</arg>
95
<command>&COMMANDNAME;</command>
96
<arg choice="plain">--help</arg>
99
<command>&COMMANDNAME;</command>
100
<arg choice="plain">--version</arg>
103
<command>&COMMANDNAME;</command>
104
<arg choice="plain">--check</arg>
60
<arg choice="plain"><option>--interface
61
<replaceable>NAME</replaceable></option></arg>
62
<arg choice="plain"><option>-i
63
<replaceable>NAME</replaceable></option></arg>
67
<arg choice="plain"><option>--address
68
<replaceable>ADDRESS</replaceable></option></arg>
69
<arg choice="plain"><option>-a
70
<replaceable>ADDRESS</replaceable></option></arg>
74
<arg choice="plain"><option>--port
75
<replaceable>PORT</replaceable></option></arg>
76
<arg choice="plain"><option>-p
77
<replaceable>PORT</replaceable></option></arg>
80
<arg><option>--priority
81
<replaceable>PRIORITY</replaceable></option></arg>
83
<arg><option>--servicename
84
<replaceable>NAME</replaceable></option></arg>
86
<arg><option>--configdir
87
<replaceable>DIRECTORY</replaceable></option></arg>
89
<arg><option>--debug</option></arg>
91
<arg><option>--debuglevel
92
<replaceable>LEVEL</replaceable></option></arg>
94
<arg><option>--no-dbus</option></arg>
96
<arg><option>--no-ipv6</option></arg>
99
<command>&COMMANDNAME;</command>
101
<arg choice="plain"><option>--help</option></arg>
102
<arg choice="plain"><option>-h</option></arg>
106
<command>&COMMANDNAME;</command>
107
<arg choice="plain"><option>--version</option></arg>
110
<command>&COMMANDNAME;</command>
111
<arg choice="plain"><option>--check</option></arg>
106
113
</refsynopsisdiv>
108
115
<refsect1 id="description">
109
116
<title>DESCRIPTION</title>
111
118
<command>&COMMANDNAME;</command> is a server daemon which
112
119
handles incoming request for passwords for a pre-defined list of
113
client host computers. The Mandos server uses Zeroconf to
114
announce itself on the local network, and uses TLS to
115
communicate securely with and to authenticate the clients. The
116
Mandos server uses IPv6 to allow Mandos clients to use IPv6
117
link-local addresses, since the clients will probably not have
118
any other addresses configured (see <xref linkend="overview"/>).
119
Any authenticated client is then given the stored pre-encrypted
120
password for that specific client.
120
client host computers. For an introduction, see
121
<citerefentry><refentrytitle>intro</refentrytitle>
122
<manvolnum>8mandos</manvolnum></citerefentry>. The Mandos server
123
uses Zeroconf to announce itself on the local network, and uses
124
TLS to communicate securely with and to authenticate the
125
clients. The Mandos server uses IPv6 to allow Mandos clients to
126
use IPv6 link-local addresses, since the clients will probably
127
not have any other addresses configured (see <xref
128
linkend="overview"/>). Any authenticated client is then given
129
the stored pre-encrypted password for that specific client.
125
133
<refsect1 id="purpose">
126
134
<title>PURPOSE</title>
129
136
The purpose of this is to enable <emphasis>remote and unattended
130
137
rebooting</emphasis> of client host computer with an
131
138
<emphasis>encrypted root file system</emphasis>. See <xref
132
139
linkend="overview"/> for details.
137
143
<refsect1 id="options">
138
144
<title>OPTIONS</title>
142
<term><literal>-h</literal>, <literal>--help</literal></term>
147
<term><option>--help</option></term>
148
<term><option>-h</option></term>
145
151
Show a help message and exit
151
<term><literal>-i</literal>, <literal>--interface <replaceable>
152
IF</replaceable></literal></term>
155
Only announce the server and listen to requests on network
156
interface <replaceable>IF</replaceable>. Default is to
157
use all available interfaces.
163
<term><literal>-a</literal>, <literal>--address <replaceable>
164
ADDRESS</replaceable></literal></term>
167
If this option is used, the server will only listen to a
168
specific address. This must currently be an IPv6 address;
169
an IPv4 address can be specified using the
170
<quote><literal>::FFFF:192.0.2.3</literal></quote> syntax.
171
Also, if a link-local address is specified, an interface
172
should be set, since a link-local address is only valid on
173
a single interface. By default, the server will listen to
174
all available addresses.
180
<term><literal>-p</literal>, <literal>--port <replaceable>
181
PORT</replaceable></literal></term>
184
If this option is used, the server to bind to that
185
port. By default, the server will listen to an arbitrary
186
port given by the operating system.
192
<term><literal>--check</literal></term>
157
<term><option>--interface</option>
158
<replaceable>NAME</replaceable></term>
159
<term><option>-i</option>
160
<replaceable>NAME</replaceable></term>
162
<xi:include href="mandos-options.xml" xpointer="interface"/>
167
<term><option>--address
168
<replaceable>ADDRESS</replaceable></option></term>
170
<replaceable>ADDRESS</replaceable></option></term>
172
<xi:include href="mandos-options.xml" xpointer="address"/>
178
<replaceable>PORT</replaceable></option></term>
180
<replaceable>PORT</replaceable></option></term>
182
<xi:include href="mandos-options.xml" xpointer="port"/>
187
<term><option>--check</option></term>
195
190
Run the server’s self-tests. This includes any unit
202
<term><literal>--debug</literal></term>
205
If the server is run in debug mode, it will run in the
206
foreground and print a lot of debugging information. The
207
default is <emphasis>not</emphasis> to run in debug mode.
213
<term><literal>--priority <replaceable>
214
PRIORITY</replaceable></literal></term>
217
GnuTLS priority string for the TLS handshake with the
218
clients. The default is
219
<quote><literal>SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP</literal></quote>.
220
See <citerefentry><refentrytitle>gnutls_priority_init
221
</refentrytitle><manvolnum>3</manvolnum></citerefentry>
222
for the syntax. <emphasis>Warning</emphasis>: changing
223
this may make the TLS handshake fail, making communication
224
with clients impossible.
230
<term><literal>--servicename <replaceable>NAME</replaceable>
234
Zeroconf service name. The default is
235
<quote><literal>Mandos</literal></quote>. You only need
236
to change this if you for some reason want to run more
237
than one server on the same <emphasis>host</emphasis>,
238
which would not normally be useful. If there are name
239
collisions on the same <emphasis>network</emphasis>, the
240
newer server will automatically rename itself to
241
<quote><literal>Mandos #2</literal></quote>, and so on;
242
therefore, this option is not needed in that case.
248
<term><literal>--configdir <replaceable>DIR</replaceable>
197
<term><option>--debug</option></term>
199
<xi:include href="mandos-options.xml" xpointer="debug"/>
204
<term><option>--debuglevel
205
<replaceable>LEVEL</replaceable></option></term>
208
Set the debugging log level.
209
<replaceable>LEVEL</replaceable> is a string, one of
210
<quote><literal>CRITICAL</literal></quote>,
211
<quote><literal>ERROR</literal></quote>,
212
<quote><literal>WARNING</literal></quote>,
213
<quote><literal>INFO</literal></quote>, or
214
<quote><literal>DEBUG</literal></quote>, in order of
215
increasing verbosity. The default level is
216
<quote><literal>WARNING</literal></quote>.
222
<term><option>--priority <replaceable>
223
PRIORITY</replaceable></option></term>
225
<xi:include href="mandos-options.xml" xpointer="priority"/>
230
<term><option>--servicename
231
<replaceable>NAME</replaceable></option></term>
233
<xi:include href="mandos-options.xml"
234
xpointer="servicename"/>
239
<term><option>--configdir
240
<replaceable>DIRECTORY</replaceable></option></term>
252
243
Directory to search for configuration files. Default is
338
346
</tbody></tgroup></table>
341
349
<refsect1 id="checking">
342
350
<title>CHECKING</title>
344
352
The server will, by default, continually check that the clients
345
353
are still up. If a client has not been confirmed as being up
346
354
for some time, the client is assumed to be compromised and is no
347
longer eligible to receive the encrypted password. The timeout,
348
checker program, and interval between checks can be configured
349
both globally and per client; see <citerefentry>
350
<refentrytitle>mandos.conf</refentrytitle>
351
<manvolnum>5</manvolnum></citerefentry> and <citerefentry>
355
longer eligible to receive the encrypted password. (Manual
356
intervention is required to re-enable a client.) The timeout,
357
extended timeout, checker program, and interval between checks
358
can be configured both globally and per client; see
359
<citerefentry><refentrytitle>mandos-clients.conf</refentrytitle>
360
<manvolnum>5</manvolnum></citerefentry>. A client successfully
361
receiving its password will also be treated as a successful
366
<refsect1 id="approval">
367
<title>APPROVAL</title>
369
The server can be configured to require manual approval for a
370
client before it is sent its secret. The delay to wait for such
371
approval and the default action (approve or deny) can be
372
configured both globally and per client; see <citerefentry>
352
373
<refentrytitle>mandos-clients.conf</refentrytitle>
353
<manvolnum>5</manvolnum></citerefentry>.
374
<manvolnum>5</manvolnum></citerefentry>. By default all clients
375
will be approved immediately without delay.
378
This can be used to deny a client its secret if not manually
379
approved within a specified time. It can also be used to make
380
the server delay before giving a client its secret, allowing
381
optional manual denying of this specific client.
357
386
<refsect1 id="logging">
358
387
<title>LOGGING</title>
360
The server will send log messaged with various severity levels
361
to <filename>/dev/log</filename>. With the
389
The server will send log message with various severity levels to
390
<filename>/dev/log</filename>. With the
362
391
<option>--debug</option> option, it will log even more messages,
363
392
and also show them on the console.
396
<refsect1 id="dbus_interface">
397
<title>D-BUS INTERFACE</title>
399
The server will by default provide a D-Bus system bus interface.
400
This interface will only be accessible by the root user or a
401
Mandos-specific user, if such a user exists. For documentation
402
of the D-Bus API, see the file <filename>DBUS-API</filename>.
367
406
<refsect1 id="exit_status">
368
407
<title>EXIT STATUS</title>
499
587
compromised if they are gone for too long.
590
If a client is compromised, its downtime should be duly noted
591
by the server which would therefore disable the client. But
592
if the server was ever restarted, it would re-read its client
593
list from its configuration file and again regard all clients
594
therein as enabled, and hence eligible to receive their
595
passwords. Therefore, be careful when restarting servers if
596
it is suspected that a client has, in fact, been compromised
597
by parties who may now be running a fake Mandos client with
598
the keys from the non-encrypted initial <acronym>RAM</acronym>
599
image of the client host. What should be done in that case
600
(if restarting the server program really is necessary) is to
601
stop the server program, edit the configuration file to omit
602
any suspect clients, and restart the server program.
502
605
For more details on client-side security, see
503
<citerefentry><refentrytitle>password-request</refentrytitle>
606
<citerefentry><refentrytitle>mandos-client</refentrytitle>
504
607
<manvolnum>8mandos</manvolnum></citerefentry>.
509
612
<refsect1 id="see_also">
510
613
<title>SEE ALSO</title>
615
<citerefentry><refentrytitle>intro</refentrytitle>
616
<manvolnum>8mandos</manvolnum></citerefentry>,
617
<citerefentry><refentrytitle>mandos-clients.conf</refentrytitle>
618
<manvolnum>5</manvolnum></citerefentry>,
619
<citerefentry><refentrytitle>mandos.conf</refentrytitle>
620
<manvolnum>5</manvolnum></citerefentry>,
621
<citerefentry><refentrytitle>mandos-client</refentrytitle>
622
<manvolnum>8mandos</manvolnum></citerefentry>,
623
<citerefentry><refentrytitle>sh</refentrytitle>
624
<manvolnum>1</manvolnum></citerefentry>
515
<refentrytitle>password-request</refentrytitle>
516
<manvolnum>8mandos</manvolnum>
521
This is the actual program which talks to this server.
522
Note that it is normally not invoked directly, and is only
523
run in the initial RAM disk environment, and not on a
524
fully started system.
530
629
<ulink url="http://www.zeroconf.org/">Zeroconf</ulink>
565
<citation>RFC 4291: <citetitle>IP Version 6 Addressing
566
Architecture</citetitle>, section 2.5.6, Link-Local IPv6
567
Unicast Addresses</citation>
664
RFC 4291: <citetitle>IP Version 6 Addressing
665
Architecture</citetitle>
571
The clients use IPv6 link-local addresses, which are
572
immediately usable since a link-local addresses is
573
automatically assigned to a network interfaces when it is
670
<term>Section 2.2: <citetitle>Text Representation of
671
Addresses</citetitle></term>
672
<listitem><para/></listitem>
675
<term>Section 2.5.5.2: <citetitle>IPv4-Mapped IPv6
676
Address</citetitle></term>
677
<listitem><para/></listitem>
680
<term>Section 2.5.6, <citetitle>Link-Local IPv6 Unicast
681
Addresses</citetitle></term>
684
The clients use IPv6 link-local addresses, which are
685
immediately usable since a link-local addresses is
686
automatically assigned to a network interfaces when it
580
<citation>RFC 4346: <citetitle>The Transport Layer Security
581
(TLS) Protocol Version 1.1</citetitle></citation>
696
RFC 4346: <citetitle>The Transport Layer Security (TLS)
697
Protocol Version 1.1</citetitle>