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>
39
36
<holder>Teddy Hogeborn</holder>
40
37
<holder>Björn Påhlsson</holder>
124
111
<command>&COMMANDNAME;</command> is a server daemon which
125
112
handles incoming request for passwords for a pre-defined list of
126
client host computers. For an introduction, see
127
<citerefentry><refentrytitle>intro</refentrytitle>
128
<manvolnum>8mandos</manvolnum></citerefentry>. The Mandos server
129
uses Zeroconf to announce itself on the local network, and uses
130
TLS to communicate securely with and to authenticate the
131
clients. The Mandos server uses IPv6 to allow Mandos clients to
132
use IPv6 link-local addresses, since the clients will probably
133
not have any other addresses configured (see <xref
134
linkend="overview"/>). Any authenticated client is then given
135
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.
210
<term><option>--debuglevel
211
<replaceable>LEVEL</replaceable></option></term>
214
Set the debugging log level.
215
<replaceable>LEVEL</replaceable> is a string, one of
216
<quote><literal>CRITICAL</literal></quote>,
217
<quote><literal>ERROR</literal></quote>,
218
<quote><literal>WARNING</literal></quote>,
219
<quote><literal>INFO</literal></quote>, or
220
<quote><literal>DEBUG</literal></quote>, in order of
221
increasing verbosity. The default level is
222
<quote><literal>WARNING</literal></quote>.
228
195
<term><option>--priority <replaceable>
229
196
PRIORITY</replaceable></option></term>
376
318
The server will, by default, continually check that the clients
377
319
are still up. If a client has not been confirmed as being up
378
320
for some time, the client is assumed to be compromised and is no
379
longer eligible to receive the encrypted password. (Manual
380
intervention is required to re-enable a client.) The timeout,
381
extended timeout, checker program, and interval between checks
382
can be configured both globally and per client; see
383
<citerefentry><refentrytitle>mandos-clients.conf</refentrytitle>
384
<manvolnum>5</manvolnum></citerefentry>. A client successfully
385
receiving its password will also be treated as a successful
390
<refsect1 id="approval">
391
<title>APPROVAL</title>
393
The server can be configured to require manual approval for a
394
client before it is sent its secret. The delay to wait for such
395
approval and the default action (approve or deny) can be
396
configured both globally and per client; see <citerefentry>
321
longer eligible to receive the encrypted password. The timeout,
322
checker program, and interval between checks can be configured
323
both globally and per client; see <citerefentry>
397
324
<refentrytitle>mandos-clients.conf</refentrytitle>
398
<manvolnum>5</manvolnum></citerefentry>. By default all clients
399
will be approved immediately without delay.
402
This can be used to deny a client its secret if not manually
403
approved within a specified time. It can also be used to make
404
the server delay before giving a client its secret, allowing
405
optional manual denying of this specific client.
325
<manvolnum>5</manvolnum></citerefentry>.
410
329
<refsect1 id="logging">
411
330
<title>LOGGING</title>
413
332
The server will send log message with various severity levels to
414
<filename class="devicefile">/dev/log</filename>. With the
333
<filename>/dev/log</filename>. With the
415
334
<option>--debug</option> option, it will log even more messages,
416
335
and also show them on the console.
420
<refsect1 id="persistent_state">
421
<title>PERSISTENT STATE</title>
423
Client settings, initially read from
424
<filename>clients.conf</filename>, are persistent across
425
restarts, and run-time changes will override settings in
426
<filename>clients.conf</filename>. However, if a setting is
427
<emphasis>changed</emphasis> (or a client added, or removed) in
428
<filename>clients.conf</filename>, this will take precedence.
432
339
<refsect1 id="dbus_interface">
433
340
<title>D-BUS INTERFACE</title>
435
342
The server will by default provide a D-Bus system bus interface.
436
343
This interface will only be accessible by the root user or a
437
Mandos-specific user, if such a user exists. For documentation
438
of the D-Bus API, see the file <filename>DBUS-API</filename>.
344
Mandos-specific user, if such a user exists.
442
349
<refsect1 id="exit_status">
443
350
<title>EXIT STATUS</title>
499
406
<term><filename>/var/run/mandos.pid</filename></term>
502
The file containing the process id of the
503
<command>&COMMANDNAME;</command> process started last.
508
<term><filename class="devicefile">/dev/log</filename></term>
512
class="directory">/var/lib/mandos</filename></term>
515
Directory where persistent state will be saved. Change
516
this with the <option>--statedir</option> option. See
517
also the <option>--no-restore</option> option.
409
The file containing the process id of
410
<command>&COMMANDNAME;</command>.
548
441
backtrace. This could be considered a feature.
444
Currently, if a client is declared <quote>invalid</quote> due to
445
having timed out, the server does not record this fact onto
446
permanent storage. This has some security implications, see
447
<xref linkend="clients"/>.
450
There is currently no way of querying the server of the current
451
status of clients, other than analyzing its <systemitem
452
class="service">syslog</systemitem> output.
551
455
There is no fine-grained control over logging and debug output.
554
458
Debug mode is conflated with running in the foreground.
461
The console log messages does not show a time stamp.
557
464
This server does not check the expire time of clients’ OpenPGP
572
479
<informalexample>
574
481
Run the server in debug mode, read configuration files from
575
the <filename class="directory">~/mandos</filename> directory,
576
and use the Zeroconf service name <quote>Test</quote> to not
577
collide with any other official Mandos server on this host:
482
the <filename>~/mandos</filename> directory, and use the
483
Zeroconf service name <quote>Test</quote> to not collide with
484
any other official Mandos server on this host:
629
536
compromised if they are gone for too long.
539
If a client is compromised, its downtime should be duly noted
540
by the server which would therefore declare the client
541
invalid. But if the server was ever restarted, it would
542
re-read its client list from its configuration file and again
543
regard all clients therein as valid, and hence eligible to
544
receive their passwords. Therefore, be careful when
545
restarting servers if it is suspected that a client has, in
546
fact, been compromised by parties who may now be running a
547
fake Mandos client with the keys from the non-encrypted
548
initial <acronym>RAM</acronym> image of the client host. What
549
should be done in that case (if restarting the server program
550
really is necessary) is to stop the server program, edit the
551
configuration file to omit any suspect clients, and restart
632
555
For more details on client-side security, see
633
556
<citerefentry><refentrytitle>mandos-client</refentrytitle>
634
557
<manvolnum>8mandos</manvolnum></citerefentry>.
639
562
<refsect1 id="see_also">
640
563
<title>SEE ALSO</title>
642
<citerefentry><refentrytitle>intro</refentrytitle>
643
<manvolnum>8mandos</manvolnum></citerefentry>,
644
<citerefentry><refentrytitle>mandos-clients.conf</refentrytitle>
645
<manvolnum>5</manvolnum></citerefentry>,
646
<citerefentry><refentrytitle>mandos.conf</refentrytitle>
647
<manvolnum>5</manvolnum></citerefentry>,
648
<citerefentry><refentrytitle>mandos-client</refentrytitle>
649
<manvolnum>8mandos</manvolnum></citerefentry>,
650
<citerefentry><refentrytitle>sh</refentrytitle>
651
<manvolnum>1</manvolnum></citerefentry>
566
<refentrytitle>mandos-clients.conf</refentrytitle>
567
<manvolnum>5</manvolnum></citerefentry>, <citerefentry>
568
<refentrytitle>mandos.conf</refentrytitle>
569
<manvolnum>5</manvolnum></citerefentry>, <citerefentry>
570
<refentrytitle>mandos-client</refentrytitle>
571
<manvolnum>8mandos</manvolnum></citerefentry>, <citerefentry>
572
<refentrytitle>sh</refentrytitle><manvolnum>1</manvolnum>
added
removed
mandos.xml
