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
40
<holder>Teddy Hogeborn</holder>
37
41
<holder>Björn Påhlsson</holder>
87
91
<arg><option>--debug</option></arg>
93
<arg><option>--debuglevel
94
<replaceable>LEVEL</replaceable></option></arg>
96
<arg><option>--no-dbus</option></arg>
89
98
<arg><option>--no-ipv6</option></arg>
100
<arg><option>--no-restore</option></arg>
102
<arg><option>--statedir
103
<replaceable>DIRECTORY</replaceable></option></arg>
105
<arg><option>--socket
106
<replaceable>FD</replaceable></option></arg>
108
<arg><option>--foreground</option></arg>
92
111
<command>&COMMANDNAME;</command>
111
130
<command>&COMMANDNAME;</command> is a server daemon which
112
131
handles incoming request for passwords for a pre-defined list of
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.
132
client host computers. For an introduction, see
133
<citerefentry><refentrytitle>intro</refentrytitle>
134
<manvolnum>8mandos</manvolnum></citerefentry>. The Mandos server
135
uses Zeroconf to announce itself on the local network, and uses
136
TLS to communicate securely with and to authenticate the
137
clients. The Mandos server uses IPv6 to allow Mandos clients to
138
use IPv6 link-local addresses, since the clients will probably
139
not have any other addresses configured (see <xref
140
linkend="overview"/>). Any authenticated client is then given
141
the stored pre-encrypted password for that specific client.
216
<term><option>--debuglevel
217
<replaceable>LEVEL</replaceable></option></term>
220
Set the debugging log level.
221
<replaceable>LEVEL</replaceable> is a string, one of
222
<quote><literal>CRITICAL</literal></quote>,
223
<quote><literal>ERROR</literal></quote>,
224
<quote><literal>WARNING</literal></quote>,
225
<quote><literal>INFO</literal></quote>, or
226
<quote><literal>DEBUG</literal></quote>, in order of
227
increasing verbosity. The default level is
228
<quote><literal>WARNING</literal></quote>.
195
234
<term><option>--priority <replaceable>
196
235
PRIORITY</replaceable></option></term>
198
<xi:include href="mandos-options.xml" xpointer="priority"/>
237
<xi:include href="mandos-options.xml"
238
xpointer="priority_compat"/>
276
<term><option>--no-dbus</option></term>
278
<xi:include href="mandos-options.xml" xpointer="dbus"/>
280
See also <xref linkend="dbus_interface"/>.
236
286
<term><option>--no-ipv6</option></term>
238
288
<xi:include href="mandos-options.xml" xpointer="ipv6"/>
293
<term><option>--no-restore</option></term>
295
<xi:include href="mandos-options.xml" xpointer="restore"/>
297
See also <xref linkend="persistent_state"/>.
303
<term><option>--statedir
304
<replaceable>DIRECTORY</replaceable></option></term>
306
<xi:include href="mandos-options.xml" xpointer="statedir"/>
311
<term><option>--socket
312
<replaceable>FD</replaceable></option></term>
314
<xi:include href="mandos-options.xml" xpointer="socket"/>
319
<term><option>--foreground</option></term>
321
<xi:include href="mandos-options.xml"
322
xpointer="foreground"/>
315
400
The server will, by default, continually check that the clients
316
401
are still up. If a client has not been confirmed as being up
317
402
for some time, the client is assumed to be compromised and is no
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>
403
longer eligible to receive the encrypted password. (Manual
404
intervention is required to re-enable a client.) The timeout,
405
extended timeout, checker program, and interval between checks
406
can be configured both globally and per client; see
407
<citerefentry><refentrytitle>mandos-clients.conf</refentrytitle>
408
<manvolnum>5</manvolnum></citerefentry>.
412
<refsect1 id="approval">
413
<title>APPROVAL</title>
415
The server can be configured to require manual approval for a
416
client before it is sent its secret. The delay to wait for such
417
approval and the default action (approve or deny) can be
418
configured both globally and per client; see <citerefentry>
321
419
<refentrytitle>mandos-clients.conf</refentrytitle>
322
<manvolnum>5</manvolnum></citerefentry>.
420
<manvolnum>5</manvolnum></citerefentry>. By default all clients
421
will be approved immediately without delay.
424
This can be used to deny a client its secret if not manually
425
approved within a specified time. It can also be used to make
426
the server delay before giving a client its secret, allowing
427
optional manual denying of this specific client.
326
432
<refsect1 id="logging">
327
433
<title>LOGGING</title>
329
435
The server will send log message with various severity levels to
330
<filename>/dev/log</filename>. With the
436
<filename class="devicefile">/dev/log</filename>. With the
331
437
<option>--debug</option> option, it will log even more messages,
332
438
and also show them on the console.
442
<refsect1 id="persistent_state">
443
<title>PERSISTENT STATE</title>
445
Client settings, initially read from
446
<filename>clients.conf</filename>, are persistent across
447
restarts, and run-time changes will override settings in
448
<filename>clients.conf</filename>. However, if a setting is
449
<emphasis>changed</emphasis> (or a client added, or removed) in
450
<filename>clients.conf</filename>, this will take precedence.
454
<refsect1 id="dbus_interface">
455
<title>D-BUS INTERFACE</title>
457
The server will by default provide a D-Bus system bus interface.
458
This interface will only be accessible by the root user or a
459
Mandos-specific user, if such a user exists. For documentation
460
of the D-Bus API, see the file <filename>DBUS-API</filename>.
336
464
<refsect1 id="exit_status">
337
465
<title>EXIT STATUS</title>
393
<term><filename>/var/run/mandos.pid</filename></term>
396
The file containing the process id of
397
<command>&COMMANDNAME;</command>.
521
<term><filename>/run/mandos.pid</filename></term>
524
The file containing the process id of the
525
<command>&COMMANDNAME;</command> process started last.
530
<term><filename class="devicefile">/dev/log</filename></term>
534
class="directory">/var/lib/mandos</filename></term>
537
Directory where persistent state will be saved. Change
538
this with the <option>--statedir</option> option. See
539
also the <option>--no-restore</option> option.
428
570
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.
442
573
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.
451
576
This server does not check the expire time of clients’ OpenPGP
466
591
<informalexample>
468
593
Run the server in debug mode, read configuration files from
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:
594
the <filename class="directory">~/mandos</filename> directory,
595
and use the Zeroconf service name <quote>Test</quote> to not
596
collide with any other official Mandos server on this host:
523
648
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
542
651
For more details on client-side security, see
543
652
<citerefentry><refentrytitle>mandos-client</refentrytitle>
544
653
<manvolnum>8mandos</manvolnum></citerefentry>.
549
658
<refsect1 id="see_also">
550
659
<title>SEE ALSO</title>
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>
661
<citerefentry><refentrytitle>intro</refentrytitle>
662
<manvolnum>8mandos</manvolnum></citerefentry>,
663
<citerefentry><refentrytitle>mandos-clients.conf</refentrytitle>
664
<manvolnum>5</manvolnum></citerefentry>,
665
<citerefentry><refentrytitle>mandos.conf</refentrytitle>
666
<manvolnum>5</manvolnum></citerefentry>,
667
<citerefentry><refentrytitle>mandos-client</refentrytitle>
668
<manvolnum>8mandos</manvolnum></citerefentry>,
669
<citerefentry><refentrytitle>sh</refentrytitle>
670
<manvolnum>1</manvolnum></citerefentry>