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>
43
35
<holder>Teddy Hogeborn</holder>
44
36
<holder>Björn Påhlsson</holder>
92
84
<replaceable>DIRECTORY</replaceable></option></arg>
94
86
<arg><option>--debug</option></arg>
96
<arg><option>--debuglevel
97
<replaceable>LEVEL</replaceable></option></arg>
99
<arg><option>--no-dbus</option></arg>
101
<arg><option>--no-ipv6</option></arg>
103
<arg><option>--no-restore</option></arg>
105
<arg><option>--statedir
106
<replaceable>DIRECTORY</replaceable></option></arg>
108
<arg><option>--socket
109
<replaceable>FD</replaceable></option></arg>
111
<arg><option>--foreground</option></arg>
113
<arg><option>--no-zeroconf</option></arg>
116
89
<command>&COMMANDNAME;</command>
135
108
<command>&COMMANDNAME;</command> is a server daemon which
136
109
handles incoming request for passwords for a pre-defined list of
137
client host computers. For an introduction, see
138
<citerefentry><refentrytitle>intro</refentrytitle>
139
<manvolnum>8mandos</manvolnum></citerefentry>. The Mandos server
140
uses Zeroconf to announce itself on the local network, and uses
141
TLS to communicate securely with and to authenticate the
142
clients. The Mandos server uses IPv6 to allow Mandos clients to
143
use IPv6 link-local addresses, since the clients will probably
144
not have any other addresses configured (see <xref
145
linkend="overview"/>). Any authenticated client is then given
146
the stored pre-encrypted password for that specific client.
110
client host computers. The Mandos server uses Zeroconf to
111
announce itself on the local network, and uses TLS to
112
communicate securely with and to authenticate the clients. The
113
Mandos server uses IPv6 to allow Mandos clients to use IPv6
114
link-local addresses, since the clients will probably not have
115
any other addresses configured (see <xref linkend="overview"/>).
116
Any authenticated client is then given the stored pre-encrypted
117
password for that specific client.
221
<term><option>--debuglevel
222
<replaceable>LEVEL</replaceable></option></term>
225
Set the debugging log level.
226
<replaceable>LEVEL</replaceable> is a string, one of
227
<quote><literal>CRITICAL</literal></quote>,
228
<quote><literal>ERROR</literal></quote>,
229
<quote><literal>WARNING</literal></quote>,
230
<quote><literal>INFO</literal></quote>, or
231
<quote><literal>DEBUG</literal></quote>, in order of
232
increasing verbosity. The default level is
233
<quote><literal>WARNING</literal></quote>.
239
192
<term><option>--priority <replaceable>
240
193
PRIORITY</replaceable></option></term>
280
<term><option>--no-dbus</option></term>
282
<xi:include href="mandos-options.xml" xpointer="dbus"/>
284
See also <xref linkend="dbus_interface"/>.
290
<term><option>--no-ipv6</option></term>
292
<xi:include href="mandos-options.xml" xpointer="ipv6"/>
297
<term><option>--no-restore</option></term>
299
<xi:include href="mandos-options.xml" xpointer="restore"/>
301
See also <xref linkend="persistent_state"/>.
307
<term><option>--statedir
308
<replaceable>DIRECTORY</replaceable></option></term>
310
<xi:include href="mandos-options.xml" xpointer="statedir"/>
315
<term><option>--socket
316
<replaceable>FD</replaceable></option></term>
318
<xi:include href="mandos-options.xml" xpointer="socket"/>
323
<term><option>--foreground</option></term>
325
<xi:include href="mandos-options.xml"
326
xpointer="foreground"/>
331
<term><option>--no-zeroconf</option></term>
333
<xi:include href="mandos-options.xml" xpointer="zeroconf"/>
411
305
The server will, by default, continually check that the clients
412
306
are still up. If a client has not been confirmed as being up
413
307
for some time, the client is assumed to be compromised and is no
414
longer eligible to receive the encrypted password. (Manual
415
intervention is required to re-enable a client.) The timeout,
416
extended timeout, checker program, and interval between checks
417
can be configured both globally and per client; see
418
<citerefentry><refentrytitle>mandos-clients.conf</refentrytitle>
308
longer eligible to receive the encrypted password. The timeout,
309
checker program, and interval between checks can be configured
310
both globally and per client; see <citerefentry>
311
<refentrytitle>mandos-clients.conf</refentrytitle>
419
312
<manvolnum>5</manvolnum></citerefentry>.
423
<refsect1 id="approval">
424
<title>APPROVAL</title>
426
The server can be configured to require manual approval for a
427
client before it is sent its secret. The delay to wait for such
428
approval and the default action (approve or deny) can be
429
configured both globally and per client; see <citerefentry>
430
<refentrytitle>mandos-clients.conf</refentrytitle>
431
<manvolnum>5</manvolnum></citerefentry>. By default all clients
432
will be approved immediately without delay.
435
This can be used to deny a client its secret if not manually
436
approved within a specified time. It can also be used to make
437
the server delay before giving a client its secret, allowing
438
optional manual denying of this specific client.
443
316
<refsect1 id="logging">
444
317
<title>LOGGING</title>
446
319
The server will send log message with various severity levels to
447
<filename class="devicefile">/dev/log</filename>. With the
320
<filename>/dev/log</filename>. With the
448
321
<option>--debug</option> option, it will log even more messages,
449
322
and also show them on the console.
453
<refsect1 id="persistent_state">
454
<title>PERSISTENT STATE</title>
456
Client settings, initially read from
457
<filename>clients.conf</filename>, are persistent across
458
restarts, and run-time changes will override settings in
459
<filename>clients.conf</filename>. However, if a setting is
460
<emphasis>changed</emphasis> (or a client added, or removed) in
461
<filename>clients.conf</filename>, this will take precedence.
465
<refsect1 id="dbus_interface">
466
<title>D-BUS INTERFACE</title>
468
The server will by default provide a D-Bus system bus interface.
469
This interface will only be accessible by the root user or a
470
Mandos-specific user, if such a user exists. For documentation
471
of the D-Bus API, see the file <filename>DBUS-API</filename>.
475
326
<refsect1 id="exit_status">
476
327
<title>EXIT STATUS</title>
532
<term><filename>/run/mandos.pid</filename></term>
535
The file containing the process id of the
536
<command>&COMMANDNAME;</command> process started last.
537
<emphasis >Note:</emphasis> If the <filename
538
class="directory">/run</filename> directory does not
539
exist, <filename>/var/run/mandos.pid</filename> will be
546
class="directory">/var/lib/mandos</filename></term>
549
Directory where persistent state will be saved. Change
550
this with the <option>--statedir</option> option. See
551
also the <option>--no-restore</option> option.
556
<term><filename class="devicefile">/dev/log</filename></term>
383
<term><filename>/var/run/mandos.pid</filename></term>
386
The file containing the process id of
387
<command>&COMMANDNAME;</command>.
392
<term><filename>/dev/log</filename></term>
559
395
The Unix domain socket to where local syslog messages are
582
418
backtrace. This could be considered a feature.
421
Currently, if a client is declared <quote>invalid</quote> due to
422
having timed out, the server does not record this fact onto
423
permanent storage. This has some security implications, see
424
<xref linkend="CLIENTS"/>.
427
There is currently no way of querying the server of the current
428
status of clients, other than analyzing its <systemitem
429
class="service">syslog</systemitem> output.
585
432
There is no fine-grained control over logging and debug output.
435
Debug mode is conflated with running in the foreground.
438
The console log messages does not show a time stamp.
588
441
This server does not check the expire time of clients’ OpenPGP
591
<xi:include href="bugs.xml"/>
594
446
<refsect1 id="example">
604
456
<informalexample>
606
458
Run the server in debug mode, read configuration files from
607
the <filename class="directory">~/mandos</filename> directory,
608
and use the Zeroconf service name <quote>Test</quote> to not
609
collide with any other official Mandos server on this host:
459
the <filename>~/mandos</filename> directory, and use the
460
Zeroconf service name <quote>Test</quote> to not collide with
461
any other official Mandos server on this host:
661
513
compromised if they are gone for too long.
516
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 <acronym>RAM</acronym> image of the client host. What
526
should be done in that case (if restarting the server program
527
really is necessary) is to stop the server program, edit the
528
configuration file to omit any suspect clients, and restart
664
532
For more details on client-side security, see
665
533
<citerefentry><refentrytitle>mandos-client</refentrytitle>
666
534
<manvolnum>8mandos</manvolnum></citerefentry>.
671
539
<refsect1 id="see_also">
672
540
<title>SEE ALSO</title>
674
<citerefentry><refentrytitle>intro</refentrytitle>
675
<manvolnum>8mandos</manvolnum></citerefentry>,
676
<citerefentry><refentrytitle>mandos-clients.conf</refentrytitle>
677
<manvolnum>5</manvolnum></citerefentry>,
678
<citerefentry><refentrytitle>mandos.conf</refentrytitle>
679
<manvolnum>5</manvolnum></citerefentry>,
680
<citerefentry><refentrytitle>mandos-client</refentrytitle>
681
<manvolnum>8mandos</manvolnum></citerefentry>,
682
<citerefentry><refentrytitle>sh</refentrytitle>
683
<manvolnum>1</manvolnum></citerefentry>
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>mandos-client</refentrytitle>
548
<manvolnum>8mandos</manvolnum></citerefentry>, <citerefentry>
549
<refentrytitle>sh</refentrytitle><manvolnum>1</manvolnum>