19
19
<firstname>Björn</firstname>
20
20
<surname>Påhlsson</surname>
22
<email>belorn@recompile.se</email>
22
<email>belorn@fukt.bsnet.se</email>
26
26
<firstname>Teddy</firstname>
27
27
<surname>Hogeborn</surname>
29
<email>teddy@recompile.se</email>
29
<email>teddy@fukt.bsnet.se</email>
44
36
<holder>Teddy Hogeborn</holder>
45
37
<holder>Björn Påhlsson</holder>
95
87
<arg><option>--debug</option></arg>
97
<arg><option>--debuglevel
98
<replaceable>LEVEL</replaceable></option></arg>
100
<arg><option>--no-dbus</option></arg>
102
89
<arg><option>--no-ipv6</option></arg>
104
<arg><option>--no-restore</option></arg>
106
<arg><option>--statedir
107
<replaceable>DIRECTORY</replaceable></option></arg>
109
<arg><option>--socket
110
<replaceable>FD</replaceable></option></arg>
112
<arg><option>--foreground</option></arg>
114
<arg><option>--no-zeroconf</option></arg>
117
92
<command>&COMMANDNAME;</command>
136
111
<command>&COMMANDNAME;</command> is a server daemon which
137
112
handles incoming request for passwords for a pre-defined list of
138
client host computers. For an introduction, see
139
<citerefentry><refentrytitle>intro</refentrytitle>
140
<manvolnum>8mandos</manvolnum></citerefentry>. The Mandos server
141
uses Zeroconf to announce itself on the local network, and uses
142
TLS to communicate securely with and to authenticate the
143
clients. The Mandos server uses IPv6 to allow Mandos clients to
144
use IPv6 link-local addresses, since the clients will probably
145
not have any other addresses configured (see <xref
146
linkend="overview"/>). Any authenticated client is then given
147
the stored pre-encrypted password for that specific client.
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.
222
<term><option>--debuglevel
223
<replaceable>LEVEL</replaceable></option></term>
226
Set the debugging log level.
227
<replaceable>LEVEL</replaceable> is a string, one of
228
<quote><literal>CRITICAL</literal></quote>,
229
<quote><literal>ERROR</literal></quote>,
230
<quote><literal>WARNING</literal></quote>,
231
<quote><literal>INFO</literal></quote>, or
232
<quote><literal>DEBUG</literal></quote>, in order of
233
increasing verbosity. The default level is
234
<quote><literal>WARNING</literal></quote>.
240
195
<term><option>--priority <replaceable>
241
196
PRIORITY</replaceable></option></term>
281
<term><option>--no-dbus</option></term>
283
<xi:include href="mandos-options.xml" xpointer="dbus"/>
285
See also <xref linkend="dbus_interface"/>.
291
236
<term><option>--no-ipv6</option></term>
293
238
<xi:include href="mandos-options.xml" xpointer="ipv6"/>
298
<term><option>--no-restore</option></term>
300
<xi:include href="mandos-options.xml" xpointer="restore"/>
302
See also <xref linkend="persistent_state"/>.
308
<term><option>--statedir
309
<replaceable>DIRECTORY</replaceable></option></term>
311
<xi:include href="mandos-options.xml" xpointer="statedir"/>
316
<term><option>--socket
317
<replaceable>FD</replaceable></option></term>
319
<xi:include href="mandos-options.xml" xpointer="socket"/>
324
<term><option>--foreground</option></term>
326
<xi:include href="mandos-options.xml"
327
xpointer="foreground"/>
332
<term><option>--no-zeroconf</option></term>
334
<xi:include href="mandos-options.xml" xpointer="zeroconf"/>
412
315
The server will, by default, continually check that the clients
413
316
are still up. If a client has not been confirmed as being up
414
317
for some time, the client is assumed to be compromised and is no
415
longer eligible to receive the encrypted password. (Manual
416
intervention is required to re-enable a client.) The timeout,
417
extended timeout, checker program, and interval between checks
418
can be configured both globally and per client; see
419
<citerefentry><refentrytitle>mandos-clients.conf</refentrytitle>
318
longer eligible to receive the encrypted password. The timeout,
319
checker program, and interval between checks can be configured
320
both globally and per client; see <citerefentry>
321
<refentrytitle>mandos-clients.conf</refentrytitle>
420
322
<manvolnum>5</manvolnum></citerefentry>.
424
<refsect1 id="approval">
425
<title>APPROVAL</title>
427
The server can be configured to require manual approval for a
428
client before it is sent its secret. The delay to wait for such
429
approval and the default action (approve or deny) can be
430
configured both globally and per client; see <citerefentry>
431
<refentrytitle>mandos-clients.conf</refentrytitle>
432
<manvolnum>5</manvolnum></citerefentry>. By default all clients
433
will be approved immediately without delay.
436
This can be used to deny a client its secret if not manually
437
approved within a specified time. It can also be used to make
438
the server delay before giving a client its secret, allowing
439
optional manual denying of this specific client.
444
326
<refsect1 id="logging">
445
327
<title>LOGGING</title>
447
329
The server will send log message with various severity levels to
448
<filename class="devicefile">/dev/log</filename>. With the
330
<filename>/dev/log</filename>. With the
449
331
<option>--debug</option> option, it will log even more messages,
450
332
and also show them on the console.
454
<refsect1 id="persistent_state">
455
<title>PERSISTENT STATE</title>
457
Client settings, initially read from
458
<filename>clients.conf</filename>, are persistent across
459
restarts, and run-time changes will override settings in
460
<filename>clients.conf</filename>. However, if a setting is
461
<emphasis>changed</emphasis> (or a client added, or removed) in
462
<filename>clients.conf</filename>, this will take precedence.
466
<refsect1 id="dbus_interface">
467
<title>D-BUS INTERFACE</title>
469
The server will by default provide a D-Bus system bus interface.
470
This interface will only be accessible by the root user or a
471
Mandos-specific user, if such a user exists. For documentation
472
of the D-Bus API, see the file <filename>DBUS-API</filename>.
476
336
<refsect1 id="exit_status">
477
337
<title>EXIT STATUS</title>
533
<term><filename>/run/mandos.pid</filename></term>
536
The file containing the process id of the
537
<command>&COMMANDNAME;</command> process started last.
538
<emphasis >Note:</emphasis> If the <filename
539
class="directory">/run</filename> directory does not
540
exist, <filename>/var/run/mandos.pid</filename> will be
547
class="directory">/var/lib/mandos</filename></term>
550
Directory where persistent state will be saved. Change
551
this with the <option>--statedir</option> option. See
552
also the <option>--no-restore</option> option.
557
<term><filename class="devicefile">/dev/log</filename></term>
393
<term><filename>/var/run/mandos.pid</filename></term>
396
The file containing the process id of
397
<command>&COMMANDNAME;</command>.
402
<term><filename>/dev/log</filename></term>
560
405
The Unix domain socket to where local syslog messages are
583
428
backtrace. This could be considered a feature.
431
Currently, if a client is declared <quote>invalid</quote> due to
432
having timed out, the server does not record this fact onto
433
permanent storage. This has some security implications, see
434
<xref linkend="clients"/>.
437
There is currently no way of querying the server of the current
438
status of clients, other than analyzing its <systemitem
439
class="service">syslog</systemitem> output.
586
442
There is no fine-grained control over logging and debug output.
445
Debug mode is conflated with running in the foreground.
448
The console log messages do not show a time stamp.
589
451
This server does not check the expire time of clients’ OpenPGP
592
<xi:include href="bugs.xml"/>
595
456
<refsect1 id="example">
605
466
<informalexample>
607
468
Run the server in debug mode, read configuration files from
608
the <filename class="directory">~/mandos</filename> directory,
609
and use the Zeroconf service name <quote>Test</quote> to not
610
collide with any other official Mandos server on this host:
469
the <filename>~/mandos</filename> directory, and use the
470
Zeroconf service name <quote>Test</quote> to not collide with
471
any other official Mandos server on this host:
662
523
compromised if they are gone for too long.
526
If a client is compromised, its downtime should be duly noted
527
by the server which would therefore declare the client
528
invalid. But if the server was ever restarted, it would
529
re-read its client list from its configuration file and again
530
regard all clients therein as valid, and hence eligible to
531
receive their passwords. Therefore, be careful when
532
restarting servers if it is suspected that a client has, in
533
fact, been compromised by parties who may now be running a
534
fake Mandos client with the keys from the non-encrypted
535
initial <acronym>RAM</acronym> image of the client host. What
536
should be done in that case (if restarting the server program
537
really is necessary) is to stop the server program, edit the
538
configuration file to omit any suspect clients, and restart
665
542
For more details on client-side security, see
666
543
<citerefentry><refentrytitle>mandos-client</refentrytitle>
667
544
<manvolnum>8mandos</manvolnum></citerefentry>.
672
549
<refsect1 id="see_also">
673
550
<title>SEE ALSO</title>
675
<citerefentry><refentrytitle>intro</refentrytitle>
676
<manvolnum>8mandos</manvolnum></citerefentry>,
677
<citerefentry><refentrytitle>mandos-clients.conf</refentrytitle>
678
<manvolnum>5</manvolnum></citerefentry>,
679
<citerefentry><refentrytitle>mandos.conf</refentrytitle>
680
<manvolnum>5</manvolnum></citerefentry>,
681
<citerefentry><refentrytitle>mandos-client</refentrytitle>
682
<manvolnum>8mandos</manvolnum></citerefentry>,
683
<citerefentry><refentrytitle>sh</refentrytitle>
684
<manvolnum>1</manvolnum></citerefentry>
553
<refentrytitle>mandos-clients.conf</refentrytitle>
554
<manvolnum>5</manvolnum></citerefentry>, <citerefentry>
555
<refentrytitle>mandos.conf</refentrytitle>
556
<manvolnum>5</manvolnum></citerefentry>, <citerefentry>
557
<refentrytitle>mandos-client</refentrytitle>
558
<manvolnum>8mandos</manvolnum></citerefentry>, <citerefentry>
559
<refentrytitle>sh</refentrytitle><manvolnum>1</manvolnum>