68
50
<refname><command>&COMMANDNAME;</command></refname>
70
Sends encrypted passwords to authenticated Mandos clients
52
Gives encrypted passwords to authenticated Mandos clients
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58
<command>&COMMANDNAME;</command>
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<arg>--interface<arg choice="plain">NAME</arg></arg>
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<arg>--address<arg choice="plain">ADDRESS</arg></arg>
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<arg>--port<arg choice="plain">PORT</arg></arg>
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<arg>--priority<arg choice="plain">PRIORITY</arg></arg>
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<arg>--servicename<arg choice="plain">NAME</arg></arg>
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<arg>--configdir<arg choice="plain">DIRECTORY</arg></arg>
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<command>&COMMANDNAME;</command>
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<arg>-i<arg choice="plain">NAME</arg></arg>
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<arg>-a<arg choice="plain">ADDRESS</arg></arg>
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<arg>-p<arg choice="plain">PORT</arg></arg>
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<arg>--priority<arg choice="plain">PRIORITY</arg></arg>
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<arg>--servicename<arg choice="plain">NAME</arg></arg>
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<arg>--configdir<arg choice="plain">DIRECTORY</arg></arg>
60
<arg choice="plain"><option>--interface
61
<replaceable>NAME</replaceable></option></arg>
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<arg choice="plain"><option>-i
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<replaceable>NAME</replaceable></option></arg>
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<arg choice="plain"><option>--address
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<replaceable>ADDRESS</replaceable></option></arg>
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<arg choice="plain"><option>-a
70
<replaceable>ADDRESS</replaceable></option></arg>
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<arg choice="plain"><option>--port
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<replaceable>PORT</replaceable></option></arg>
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<arg choice="plain"><option>-p
77
<replaceable>PORT</replaceable></option></arg>
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<arg><option>--priority
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<replaceable>PRIORITY</replaceable></option></arg>
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<arg><option>--servicename
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<replaceable>NAME</replaceable></option></arg>
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<arg><option>--configdir
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<replaceable>DIRECTORY</replaceable></option></arg>
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<arg><option>--debug</option></arg>
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<arg><option>--debuglevel
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<replaceable>LEVEL</replaceable></option></arg>
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<arg><option>--no-dbus</option></arg>
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<arg><option>--no-ipv6</option></arg>
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<command>&COMMANDNAME;</command>
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<group choice="req">
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<arg choice="plain">-h</arg>
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<arg choice="plain">--help</arg>
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<arg choice="plain"><option>--help</option></arg>
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<arg choice="plain"><option>-h</option></arg>
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<command>&COMMANDNAME;</command>
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<arg choice="plain">--version</arg>
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<arg choice="plain"><option>--version</option></arg>
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<command>&COMMANDNAME;</command>
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<arg choice="plain">--check</arg>
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<arg choice="plain"><option>--check</option></arg>
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</refsynopsisdiv>
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115
<refsect1 id="description">
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<title>DESCRIPTION</title>
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118
<command>&COMMANDNAME;</command> is a server daemon which
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119
handles incoming request for passwords for a pre-defined list of
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client host computers. The Mandos server uses Zeroconf to
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announce itself on the local network, and uses TLS to
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communicate securely with and to authenticate the clients. The
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Mandos server uses IPv6 to allow Mandos clients to use IPv6
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link-local addresses, since the clients will probably not have
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any other addresses configured (see <xref linkend="overview"/>).
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Any authenticated client is then given the stored pre-encrypted
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password for that specific client.
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client host computers. For an introduction, see
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<citerefentry><refentrytitle>intro</refentrytitle>
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<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
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the stored pre-encrypted password for that specific client.
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133
<refsect1 id="purpose">
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<title>PURPOSE</title>
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136
The purpose of this is to enable <emphasis>remote and unattended
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137
rebooting</emphasis> of client host computer with an
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138
<emphasis>encrypted root file system</emphasis>. See <xref
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139
linkend="overview"/> for details.
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<refsect1 id="options">
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<title>OPTIONS</title>
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<term><literal>-h</literal>, <literal>--help</literal></term>
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<term><option>--help</option></term>
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<term><option>-h</option></term>
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Show a help message and exit
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<term><literal>-i</literal>, <literal>--interface <replaceable
156
>NAME</replaceable></literal></term>
157
<term><option>--interface</option>
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<replaceable>NAME</replaceable></term>
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<term><option>-i</option>
160
<replaceable>NAME</replaceable></term>
158
162
<xi:include href="mandos-options.xml" xpointer="interface"/>
163
<term><literal>-a</literal>, <literal>--address <replaceable>
164
ADDRESS</replaceable></literal></term>
167
<term><option>--address
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<replaceable>ADDRESS</replaceable></option></term>
170
<replaceable>ADDRESS</replaceable></option></term>
166
172
<xi:include href="mandos-options.xml" xpointer="address"/>
171
<term><literal>-p</literal>, <literal>--port <replaceable>
172
PORT</replaceable></literal></term>
178
<replaceable>PORT</replaceable></option></term>
180
<replaceable>PORT</replaceable></option></term>
174
182
<xi:include href="mandos-options.xml" xpointer="port"/>
179
<term><literal>--check</literal></term>
187
<term><option>--check</option></term>
182
190
Run the server’s self-tests. This includes any unit
189
<term><literal>--debug</literal></term>
197
<term><option>--debug</option></term>
191
199
<xi:include href="mandos-options.xml" xpointer="debug"/>
196
<term><literal>--priority <replaceable>
197
PRIORITY</replaceable></literal></term>
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>
199
225
<xi:include href="mandos-options.xml" xpointer="priority"/>
204
<term><literal>--servicename <replaceable>NAME</replaceable>
230
<term><option>--servicename
231
<replaceable>NAME</replaceable></option></term>
207
233
<xi:include href="mandos-options.xml"
208
234
xpointer="servicename"/>
213
<term><literal>--configdir <replaceable>DIR</replaceable>
239
<term><option>--configdir
240
<replaceable>DIRECTORY</replaceable></option></term>
217
243
Directory to search for configuration files. Default is
303
346
</tbody></tgroup></table>
306
349
<refsect1 id="checking">
307
350
<title>CHECKING</title>
309
352
The server will, by default, continually check that the clients
310
353
are still up. If a client has not been confirmed as being up
311
354
for some time, the client is assumed to be compromised and is no
312
longer eligible to receive the encrypted password. The timeout,
313
checker program, and interval between checks can be configured
314
both globally and per client; see <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>
315
373
<refentrytitle>mandos-clients.conf</refentrytitle>
316
<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.
320
386
<refsect1 id="logging">
321
387
<title>LOGGING</title>
516
590
If a client is compromised, its downtime should be duly noted
517
by the server which would therefore declare the client
518
invalid. But if the server was ever restarted, it would
519
re-read its client list from its configuration file and again
520
regard all clients therein as valid, and hence eligible to
521
receive their passwords. Therefore, be careful when
522
restarting servers if it is suspected that a client has, in
523
fact, been compromised by parties who may now be running a
524
fake Mandos client with the keys from the non-encrypted
525
initial RAM image of the client host. What should be done in
526
that case (if restarting the server program really is
527
necessary) is to stop the server program, edit the
528
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.
532
605
For more details on client-side security, see
533
<citerefentry><refentrytitle>password-request</refentrytitle>
606
<citerefentry><refentrytitle>mandos-client</refentrytitle>
534
607
<manvolnum>8mandos</manvolnum></citerefentry>.
539
612
<refsect1 id="see_also">
540
613
<title>SEE ALSO</title>
543
<refentrytitle>mandos-clients.conf</refentrytitle>
544
<manvolnum>5</manvolnum></citerefentry>, <citerefentry>
545
<refentrytitle>mandos.conf</refentrytitle>
546
<manvolnum>5</manvolnum></citerefentry>, <citerefentry>
547
<refentrytitle>password-request</refentrytitle>
548
<manvolnum>8mandos</manvolnum></citerefentry>, <citerefentry>
549
<refentrytitle>sh</refentrytitle><manvolnum>1</manvolnum>
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>