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>--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>
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>
95
99
<command>&COMMANDNAME;</command>
96
100
<group choice="req">
97
<arg choice="plain">-h</arg>
98
<arg choice="plain">--help</arg>
101
<arg choice="plain"><option>--help</option></arg>
102
<arg choice="plain"><option>-h</option></arg>
102
106
<command>&COMMANDNAME;</command>
103
<arg choice="plain">--version</arg>
107
<arg choice="plain"><option>--version</option></arg>
106
110
<command>&COMMANDNAME;</command>
107
<arg choice="plain">--check</arg>
111
<arg choice="plain"><option>--check</option></arg>
109
113
</refsynopsisdiv>
111
115
<refsect1 id="description">
112
116
<title>DESCRIPTION</title>
114
118
<command>&COMMANDNAME;</command> is a server daemon which
115
119
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.
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.
128
133
<refsect1 id="purpose">
129
134
<title>PURPOSE</title>
132
136
The purpose of this is to enable <emphasis>remote and unattended
133
137
rebooting</emphasis> of client host computer with an
134
138
<emphasis>encrypted root file system</emphasis>. See <xref
135
139
linkend="overview"/> for details.
140
143
<refsect1 id="options">
141
144
<title>OPTIONS</title>
145
<term><literal>-h</literal>, <literal>--help</literal></term>
147
<term><option>--help</option></term>
148
<term><option>-h</option></term>
148
151
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>
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>
200
190
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>
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>
258
243
Directory to search for configuration files. Default is
344
346
</tbody></tgroup></table>
347
349
<refsect1 id="checking">
348
350
<title>CHECKING</title>
350
352
The server will, by default, continually check that the clients
351
353
are still up. If a client has not been confirmed as being up
352
354
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>
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>
358
373
<refentrytitle>mandos-clients.conf</refentrytitle>
359
<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.
363
386
<refsect1 id="logging">
364
387
<title>LOGGING</title>
366
The server will send log messaged with various severity levels
367
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
368
391
<option>--debug</option> option, it will log even more messages,
369
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>.
373
406
<refsect1 id="exit_status">
374
407
<title>EXIT STATUS</title>
559
590
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
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.
575
605
For more details on client-side security, see
576
<citerefentry><refentrytitle>password-request</refentrytitle>
606
<citerefentry><refentrytitle>mandos-client</refentrytitle>
577
607
<manvolnum>8mandos</manvolnum></citerefentry>.
582
612
<refsect1 id="see_also">
583
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>
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
629
<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>
664
RFC 4291: <citetitle>IP Version 6 Addressing
665
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
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
653
<citation>RFC 4346: <citetitle>The Transport Layer Security
654
(TLS) Protocol Version 1.1</citetitle></citation>
696
RFC 4346: <citetitle>The Transport Layer Security (TLS)
697
Protocol Version 1.1</citetitle>