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>
42
36
<holder>Teddy Hogeborn</holder>
43
37
<holder>Björn Påhlsson</holder>
93
87
<arg><option>--debug</option></arg>
95
<arg><option>--debuglevel
96
<replaceable>LEVEL</replaceable></option></arg>
98
89
<arg><option>--no-dbus</option></arg>
100
91
<arg><option>--no-ipv6</option></arg>
102
<arg><option>--no-restore</option></arg>
104
<arg><option>--statedir
105
<replaceable>DIRECTORY</replaceable></option></arg>
107
<arg><option>--socket
108
<replaceable>FD</replaceable></option></arg>
110
<arg><option>--foreground</option></arg>
112
<arg><option>--no-zeroconf</option></arg>
115
94
<command>&COMMANDNAME;</command>
134
113
<command>&COMMANDNAME;</command> is a server daemon which
135
114
handles incoming request for passwords for a pre-defined list of
136
client host computers. For an introduction, see
137
<citerefentry><refentrytitle>intro</refentrytitle>
138
<manvolnum>8mandos</manvolnum></citerefentry>. The Mandos server
139
uses Zeroconf to announce itself on the local network, and uses
140
TLS to communicate securely with and to authenticate the
141
clients. The Mandos server uses IPv6 to allow Mandos clients to
142
use IPv6 link-local addresses, since the clients will probably
143
not have any other addresses configured (see <xref
144
linkend="overview"/>). Any authenticated client is then given
145
the stored pre-encrypted password for that specific client.
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.
220
<term><option>--debuglevel
221
<replaceable>LEVEL</replaceable></option></term>
224
Set the debugging log level.
225
<replaceable>LEVEL</replaceable> is a string, one of
226
<quote><literal>CRITICAL</literal></quote>,
227
<quote><literal>ERROR</literal></quote>,
228
<quote><literal>WARNING</literal></quote>,
229
<quote><literal>INFO</literal></quote>, or
230
<quote><literal>DEBUG</literal></quote>, in order of
231
increasing verbosity. The default level is
232
<quote><literal>WARNING</literal></quote>.
238
197
<term><option>--priority <replaceable>
239
198
PRIORITY</replaceable></option></term>
291
250
<xi:include href="mandos-options.xml" xpointer="ipv6"/>
296
<term><option>--no-restore</option></term>
298
<xi:include href="mandos-options.xml" xpointer="restore"/>
300
See also <xref linkend="persistent_state"/>.
306
<term><option>--statedir
307
<replaceable>DIRECTORY</replaceable></option></term>
309
<xi:include href="mandos-options.xml" xpointer="statedir"/>
314
<term><option>--socket
315
<replaceable>FD</replaceable></option></term>
317
<xi:include href="mandos-options.xml" xpointer="socket"/>
322
<term><option>--foreground</option></term>
324
<xi:include href="mandos-options.xml"
325
xpointer="foreground"/>
330
<term><option>--no-zeroconf</option></term>
332
<xi:include href="mandos-options.xml" xpointer="zeroconf"/>
410
327
The server will, by default, continually check that the clients
411
328
are still up. If a client has not been confirmed as being up
412
329
for some time, the client is assumed to be compromised and is no
413
longer eligible to receive the encrypted password. (Manual
414
intervention is required to re-enable a client.) The timeout,
415
extended timeout, checker program, and interval between checks
416
can be configured both globally and per client; see
417
<citerefentry><refentrytitle>mandos-clients.conf</refentrytitle>
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>
333
<refentrytitle>mandos-clients.conf</refentrytitle>
418
334
<manvolnum>5</manvolnum></citerefentry>.
422
<refsect1 id="approval">
423
<title>APPROVAL</title>
425
The server can be configured to require manual approval for a
426
client before it is sent its secret. The delay to wait for such
427
approval and the default action (approve or deny) can be
428
configured both globally and per client; see <citerefentry>
429
<refentrytitle>mandos-clients.conf</refentrytitle>
430
<manvolnum>5</manvolnum></citerefentry>. By default all clients
431
will be approved immediately without delay.
434
This can be used to deny a client its secret if not manually
435
approved within a specified time. It can also be used to make
436
the server delay before giving a client its secret, allowing
437
optional manual denying of this specific client.
442
338
<refsect1 id="logging">
443
339
<title>LOGGING</title>
445
341
The server will send log message with various severity levels to
446
<filename class="devicefile">/dev/log</filename>. With the
342
<filename>/dev/log</filename>. With the
447
343
<option>--debug</option> option, it will log even more messages,
448
344
and also show them on the console.
452
<refsect1 id="persistent_state">
453
<title>PERSISTENT STATE</title>
455
Client settings, initially read from
456
<filename>clients.conf</filename>, are persistent across
457
restarts, and run-time changes will override settings in
458
<filename>clients.conf</filename>. However, if a setting is
459
<emphasis>changed</emphasis> (or a client added, or removed) in
460
<filename>clients.conf</filename>, this will take precedence.
464
348
<refsect1 id="dbus_interface">
465
349
<title>D-BUS INTERFACE</title>
467
351
The server will by default provide a D-Bus system bus interface.
468
352
This interface will only be accessible by the root user or a
469
Mandos-specific user, if such a user exists. For documentation
470
of the D-Bus API, see the file <filename>DBUS-API</filename>.
353
Mandos-specific user, if such a user exists.
474
358
<refsect1 id="exit_status">
475
359
<title>EXIT STATUS</title>
531
<term><filename>/run/mandos.pid</filename></term>
534
The file containing the process id of the
535
<command>&COMMANDNAME;</command> process started last.
536
<emphasis >Note:</emphasis> If the <filename
537
class="directory">/run</filename> directory does not
538
exist, <filename>/var/run/mandos.pid</filename> will be
544
<term><filename class="devicefile">/dev/log</filename></term>
548
class="directory">/var/lib/mandos</filename></term>
551
Directory where persistent state will be saved. Change
552
this with the <option>--statedir</option> option. See
553
also the <option>--no-restore</option> option.
415
<term><filename>/var/run/mandos.pid</filename></term>
418
The file containing the process id of
419
<command>&COMMANDNAME;</command>.
584
450
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.
587
464
There is no fine-grained control over logging and debug output.
467
Debug mode is conflated with running in the foreground.
470
The console log messages does not show a time stamp.
590
473
This server does not check the expire time of clients’ OpenPGP
605
488
<informalexample>
607
490
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:
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:
662
545
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
665
564
For more details on client-side security, see
666
565
<citerefentry><refentrytitle>mandos-client</refentrytitle>
667
566
<manvolnum>8mandos</manvolnum></citerefentry>.
672
571
<refsect1 id="see_also">
673
572
<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>
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>