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
39
<holder>Teddy Hogeborn</holder>
37
40
<holder>Björn Påhlsson</holder>
87
90
<arg><option>--debug</option></arg>
92
<arg><option>--debuglevel
93
<replaceable>LEVEL</replaceable></option></arg>
89
95
<arg><option>--no-dbus</option></arg>
91
97
<arg><option>--no-ipv6</option></arg>
99
<arg><option>--no-restore</option></arg>
101
<arg><option>--statedir
102
<replaceable>DIRECTORY</replaceable></option></arg>
94
105
<command>&COMMANDNAME;</command>
113
124
<command>&COMMANDNAME;</command> is a server daemon which
114
125
handles incoming request for passwords for a pre-defined list of
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.
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.
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>.
197
228
<term><option>--priority <replaceable>
198
229
PRIORITY</replaceable></option></term>
329
378
for some time, the client is assumed to be compromised and is no
330
379
longer eligible to receive the encrypted password. (Manual
331
380
intervention is required to re-enable a client.) The timeout,
332
checker program, and interval between checks can be configured
333
both globally and per client; see <citerefentry>
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>
334
397
<refentrytitle>mandos-clients.conf</refentrytitle>
335
<manvolnum>5</manvolnum></citerefentry>.
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.
339
410
<refsect1 id="logging">
340
411
<title>LOGGING</title>
342
413
The server will send log message with various severity levels to
343
<filename>/dev/log</filename>. With the
414
<filename class="devicefile">/dev/log</filename>. With the
344
415
<option>--debug</option> option, it will log even more messages,
345
416
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.
349
432
<refsect1 id="dbus_interface">
350
433
<title>D-BUS INTERFACE</title>
352
435
The server will by default provide a D-Bus system bus interface.
353
436
This interface will only be accessible by the root user or a
354
Mandos-specific user, if such a user exists.
437
Mandos-specific user, if such a user exists. For documentation
438
of the D-Bus API, see the file <filename>DBUS-API</filename>.
416
499
<term><filename>/var/run/mandos.pid</filename></term>
419
The file containing the process id of
420
<command>&COMMANDNAME;</command>.
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.
451
548
backtrace. This could be considered a feature.
454
Currently, if a client is declared <quote>invalid</quote> due to
455
having timed out, the server does not record this fact onto
456
permanent storage. This has some security implications, see
457
<xref linkend="clients"/>.
460
There is currently no way of querying the server of the current
461
status of clients, other than analyzing its <systemitem
462
class="service">syslog</systemitem> output.
465
551
There is no fine-grained control over logging and debug output.
468
554
Debug mode is conflated with running in the foreground.
471
The console log messages do not show a time stamp.
474
557
This server does not check the expire time of clients’ OpenPGP
489
572
<informalexample>
491
574
Run the server in debug mode, read configuration files from
492
the <filename>~/mandos</filename> directory, and use the
493
Zeroconf service name <quote>Test</quote> to not collide with
494
any other official Mandos server on this host:
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:
546
629
compromised if they are gone for too long.
549
If a client is compromised, its downtime should be duly noted
550
by the server which would therefore declare the client
551
invalid. But if the server was ever restarted, it would
552
re-read its client list from its configuration file and again
553
regard all clients therein as valid, and hence eligible to
554
receive their passwords. Therefore, be careful when
555
restarting servers if it is suspected that a client has, in
556
fact, been compromised by parties who may now be running a
557
fake Mandos client with the keys from the non-encrypted
558
initial <acronym>RAM</acronym> image of the client host. What
559
should be done in that case (if restarting the server program
560
really is necessary) is to stop the server program, edit the
561
configuration file to omit any suspect clients, and restart
565
632
For more details on client-side security, see
566
633
<citerefentry><refentrytitle>mandos-client</refentrytitle>
567
634
<manvolnum>8mandos</manvolnum></citerefentry>.
572
639
<refsect1 id="see_also">
573
640
<title>SEE ALSO</title>
576
<refentrytitle>mandos-clients.conf</refentrytitle>
577
<manvolnum>5</manvolnum></citerefentry>, <citerefentry>
578
<refentrytitle>mandos.conf</refentrytitle>
579
<manvolnum>5</manvolnum></citerefentry>, <citerefentry>
580
<refentrytitle>mandos-client</refentrytitle>
581
<manvolnum>8mandos</manvolnum></citerefentry>, <citerefentry>
582
<refentrytitle>sh</refentrytitle><manvolnum>1</manvolnum>
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>