19
19
<firstname>Björn</firstname>
20
20
<surname>Påhlsson</surname>
22
<email>belorn@fukt.bsnet.se</email>
22
<email>belorn@recompile.se</email>
26
26
<firstname>Teddy</firstname>
27
27
<surname>Hogeborn</surname>
29
<email>teddy@fukt.bsnet.se</email>
29
<email>teddy@recompile.se</email>
36
39
<holder>Teddy Hogeborn</holder>
37
40
<holder>Björn Påhlsson</holder>
87
90
<arg><option>--debug</option></arg>
92
<arg><option>--debuglevel
93
<replaceable>LEVEL</replaceable></option></arg>
89
95
<arg><option>--no-dbus</option></arg>
91
97
<arg><option>--no-ipv6</option></arg>
99
<arg><option>--no-restore</option></arg>
101
<arg><option>--statedir
102
<replaceable>DIRECTORY</replaceable></option></arg>
104
<arg><option>--socket
105
<replaceable>FD</replaceable></option></arg>
94
108
<command>&COMMANDNAME;</command>
113
127
<command>&COMMANDNAME;</command> is a server daemon which
114
128
handles incoming request for passwords for a pre-defined list of
115
client host computers. The Mandos server uses Zeroconf to
116
announce itself on the local network, and uses TLS to
117
communicate securely with and to authenticate the clients. The
118
Mandos server uses IPv6 to allow Mandos clients to use IPv6
119
link-local addresses, since the clients will probably not have
120
any other addresses configured (see <xref linkend="overview"/>).
121
Any authenticated client is then given the stored pre-encrypted
122
password for that specific client.
129
client host computers. For an introduction, see
130
<citerefentry><refentrytitle>intro</refentrytitle>
131
<manvolnum>8mandos</manvolnum></citerefentry>. The Mandos server
132
uses Zeroconf to announce itself on the local network, and uses
133
TLS to communicate securely with and to authenticate the
134
clients. The Mandos server uses IPv6 to allow Mandos clients to
135
use IPv6 link-local addresses, since the clients will probably
136
not have any other addresses configured (see <xref
137
linkend="overview"/>). Any authenticated client is then given
138
the stored pre-encrypted password for that specific client.
213
<term><option>--debuglevel
214
<replaceable>LEVEL</replaceable></option></term>
217
Set the debugging log level.
218
<replaceable>LEVEL</replaceable> is a string, one of
219
<quote><literal>CRITICAL</literal></quote>,
220
<quote><literal>ERROR</literal></quote>,
221
<quote><literal>WARNING</literal></quote>,
222
<quote><literal>INFO</literal></quote>, or
223
<quote><literal>DEBUG</literal></quote>, in order of
224
increasing verbosity. The default level is
225
<quote><literal>WARNING</literal></quote>.
197
231
<term><option>--priority <replaceable>
198
232
PRIORITY</replaceable></option></term>
250
284
<xi:include href="mandos-options.xml" xpointer="ipv6"/>
289
<term><option>--no-restore</option></term>
291
<xi:include href="mandos-options.xml" xpointer="restore"/>
293
See also <xref linkend="persistent_state"/>.
299
<term><option>--statedir
300
<replaceable>DIRECTORY</replaceable></option></term>
302
<xi:include href="mandos-options.xml" xpointer="statedir"/>
307
<term><option>--socket
308
<replaceable>FD</replaceable></option></term>
310
<xi:include href="mandos-options.xml" xpointer="socket"/>
327
388
The server will, by default, continually check that the clients
328
389
are still up. If a client has not been confirmed as being up
329
390
for some time, the client is assumed to be compromised and is no
330
longer eligible to receive the encrypted password. The timeout,
331
checker program, and interval between checks can be configured
332
both globally and per client; see <citerefentry>
391
longer eligible to receive the encrypted password. (Manual
392
intervention is required to re-enable a client.) The timeout,
393
extended timeout, checker program, and interval between checks
394
can be configured both globally and per client; see
395
<citerefentry><refentrytitle>mandos-clients.conf</refentrytitle>
396
<manvolnum>5</manvolnum></citerefentry>.
400
<refsect1 id="approval">
401
<title>APPROVAL</title>
403
The server can be configured to require manual approval for a
404
client before it is sent its secret. The delay to wait for such
405
approval and the default action (approve or deny) can be
406
configured both globally and per client; see <citerefentry>
333
407
<refentrytitle>mandos-clients.conf</refentrytitle>
334
<manvolnum>5</manvolnum></citerefentry>.
408
<manvolnum>5</manvolnum></citerefentry>. By default all clients
409
will be approved immediately without delay.
412
This can be used to deny a client its secret if not manually
413
approved within a specified time. It can also be used to make
414
the server delay before giving a client its secret, allowing
415
optional manual denying of this specific client.
338
420
<refsect1 id="logging">
339
421
<title>LOGGING</title>
341
423
The server will send log message with various severity levels to
342
<filename>/dev/log</filename>. With the
424
<filename class="devicefile">/dev/log</filename>. With the
343
425
<option>--debug</option> option, it will log even more messages,
344
426
and also show them on the console.
430
<refsect1 id="persistent_state">
431
<title>PERSISTENT STATE</title>
433
Client settings, initially read from
434
<filename>clients.conf</filename>, are persistent across
435
restarts, and run-time changes will override settings in
436
<filename>clients.conf</filename>. However, if a setting is
437
<emphasis>changed</emphasis> (or a client added, or removed) in
438
<filename>clients.conf</filename>, this will take precedence.
348
442
<refsect1 id="dbus_interface">
349
443
<title>D-BUS INTERFACE</title>
351
445
The server will by default provide a D-Bus system bus interface.
352
446
This interface will only be accessible by the root user or a
353
Mandos-specific user, if such a user exists.
447
Mandos-specific user, if such a user exists. For documentation
448
of the D-Bus API, see the file <filename>DBUS-API</filename>.
358
452
<refsect1 id="exit_status">
359
453
<title>EXIT STATUS</title>
415
509
<term><filename>/var/run/mandos.pid</filename></term>
418
The file containing the process id of
419
<command>&COMMANDNAME;</command>.
512
The file containing the process id of the
513
<command>&COMMANDNAME;</command> process started last.
518
<term><filename class="devicefile">/dev/log</filename></term>
522
class="directory">/var/lib/mandos</filename></term>
525
Directory where persistent state will be saved. Change
526
this with the <option>--statedir</option> option. See
527
also the <option>--no-restore</option> option.
450
558
backtrace. This could be considered a feature.
453
Currently, if a client is declared <quote>invalid</quote> due to
454
having timed out, the server does not record this fact onto
455
permanent storage. This has some security implications, see
456
<xref linkend="clients"/>.
459
There is currently no way of querying the server of the current
460
status of clients, other than analyzing its <systemitem
461
class="service">syslog</systemitem> output.
464
561
There is no fine-grained control over logging and debug output.
467
564
Debug mode is conflated with running in the foreground.
470
The console log messages does not show a time stamp.
473
567
This server does not check the expire time of clients’ OpenPGP
488
582
<informalexample>
490
584
Run the server in debug mode, read configuration files from
491
the <filename>~/mandos</filename> directory, and use the
492
Zeroconf service name <quote>Test</quote> to not collide with
493
any other official Mandos server on this host:
585
the <filename class="directory">~/mandos</filename> directory,
586
and use the Zeroconf service name <quote>Test</quote> to not
587
collide with any other official Mandos server on this host:
545
639
compromised if they are gone for too long.
548
If a client is compromised, its downtime should be duly noted
549
by the server which would therefore declare the client
550
invalid. But if the server was ever restarted, it would
551
re-read its client list from its configuration file and again
552
regard all clients therein as valid, and hence eligible to
553
receive their passwords. Therefore, be careful when
554
restarting servers if it is suspected that a client has, in
555
fact, been compromised by parties who may now be running a
556
fake Mandos client with the keys from the non-encrypted
557
initial <acronym>RAM</acronym> image of the client host. What
558
should be done in that case (if restarting the server program
559
really is necessary) is to stop the server program, edit the
560
configuration file to omit any suspect clients, and restart
564
642
For more details on client-side security, see
565
643
<citerefentry><refentrytitle>mandos-client</refentrytitle>
566
644
<manvolnum>8mandos</manvolnum></citerefentry>.
571
649
<refsect1 id="see_also">
572
650
<title>SEE ALSO</title>
575
<refentrytitle>mandos-clients.conf</refentrytitle>
576
<manvolnum>5</manvolnum></citerefentry>, <citerefentry>
577
<refentrytitle>mandos.conf</refentrytitle>
578
<manvolnum>5</manvolnum></citerefentry>, <citerefentry>
579
<refentrytitle>mandos-client</refentrytitle>
580
<manvolnum>8mandos</manvolnum></citerefentry>, <citerefentry>
581
<refentrytitle>sh</refentrytitle><manvolnum>1</manvolnum>
652
<citerefentry><refentrytitle>intro</refentrytitle>
653
<manvolnum>8mandos</manvolnum></citerefentry>,
654
<citerefentry><refentrytitle>mandos-clients.conf</refentrytitle>
655
<manvolnum>5</manvolnum></citerefentry>,
656
<citerefentry><refentrytitle>mandos.conf</refentrytitle>
657
<manvolnum>5</manvolnum></citerefentry>,
658
<citerefentry><refentrytitle>mandos-client</refentrytitle>
659
<manvolnum>8mandos</manvolnum></citerefentry>,
660
<citerefentry><refentrytitle>sh</refentrytitle>
661
<manvolnum>1</manvolnum></citerefentry>