2
2
<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
3
3
"http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
4
4
<!ENTITY COMMANDNAME "mandos">
5
<!ENTITY TIMESTAMP "2009-01-04">
5
<!ENTITY TIMESTAMP "2011-10-22">
6
6
<!ENTITY % common SYSTEM "common.ent">
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
38
<holder>Teddy Hogeborn</holder>
37
39
<holder>Björn Påhlsson</holder>
85
87
<replaceable>DIRECTORY</replaceable></option></arg>
87
89
<arg><option>--debug</option></arg>
91
<arg><option>--debuglevel
92
<replaceable>LEVEL</replaceable></option></arg>
94
<arg><option>--no-dbus</option></arg>
96
<arg><option>--no-ipv6</option></arg>
98
<arg><option>--no-restore</option></arg>
90
101
<command>&COMMANDNAME;</command>
109
120
<command>&COMMANDNAME;</command> is a server daemon which
110
121
handles incoming request for passwords for a pre-defined list of
111
client host computers. The Mandos server uses Zeroconf to
112
announce itself on the local network, and uses TLS to
113
communicate securely with and to authenticate the clients. The
114
Mandos server uses IPv6 to allow Mandos clients to use IPv6
115
link-local addresses, since the clients will probably not have
116
any other addresses configured (see <xref linkend="overview"/>).
117
Any authenticated client is then given the stored pre-encrypted
118
password for that specific client.
122
client host computers. For an introduction, see
123
<citerefentry><refentrytitle>intro</refentrytitle>
124
<manvolnum>8mandos</manvolnum></citerefentry>. The Mandos server
125
uses Zeroconf to announce itself on the local network, and uses
126
TLS to communicate securely with and to authenticate the
127
clients. The Mandos server uses IPv6 to allow Mandos clients to
128
use IPv6 link-local addresses, since the clients will probably
129
not have any other addresses configured (see <xref
130
linkend="overview"/>). Any authenticated client is then given
131
the stored pre-encrypted password for that specific client.
206
<term><option>--debuglevel
207
<replaceable>LEVEL</replaceable></option></term>
210
Set the debugging log level.
211
<replaceable>LEVEL</replaceable> is a string, one of
212
<quote><literal>CRITICAL</literal></quote>,
213
<quote><literal>ERROR</literal></quote>,
214
<quote><literal>WARNING</literal></quote>,
215
<quote><literal>INFO</literal></quote>, or
216
<quote><literal>DEBUG</literal></quote>, in order of
217
increasing verbosity. The default level is
218
<quote><literal>WARNING</literal></quote>.
193
224
<term><option>--priority <replaceable>
194
225
PRIORITY</replaceable></option></term>
265
<term><option>--no-dbus</option></term>
267
<xi:include href="mandos-options.xml" xpointer="dbus"/>
269
See also <xref linkend="dbus_interface"/>.
275
<term><option>--no-ipv6</option></term>
277
<xi:include href="mandos-options.xml" xpointer="ipv6"/>
282
<term><option>--no-restore</option></term>
284
<xi:include href="mandos-options.xml" xpointer="restore"/>
306
361
The server will, by default, continually check that the clients
307
362
are still up. If a client has not been confirmed as being up
308
363
for some time, the client is assumed to be compromised and is no
309
longer eligible to receive the encrypted password. The timeout,
310
checker program, and interval between checks can be configured
311
both globally and per client; see <citerefentry>
364
longer eligible to receive the encrypted password. (Manual
365
intervention is required to re-enable a client.) The timeout,
366
extended timeout, checker program, and interval between checks
367
can be configured both globally and per client; see
368
<citerefentry><refentrytitle>mandos-clients.conf</refentrytitle>
369
<manvolnum>5</manvolnum></citerefentry>. A client successfully
370
receiving its password will also be treated as a successful
375
<refsect1 id="approval">
376
<title>APPROVAL</title>
378
The server can be configured to require manual approval for a
379
client before it is sent its secret. The delay to wait for such
380
approval and the default action (approve or deny) can be
381
configured both globally and per client; see <citerefentry>
312
382
<refentrytitle>mandos-clients.conf</refentrytitle>
313
<manvolnum>5</manvolnum></citerefentry>.
383
<manvolnum>5</manvolnum></citerefentry>. By default all clients
384
will be approved immediately without delay.
387
This can be used to deny a client its secret if not manually
388
approved within a specified time. It can also be used to make
389
the server delay before giving a client its secret, allowing
390
optional manual denying of this specific client.
317
395
<refsect1 id="logging">
318
396
<title>LOGGING</title>
320
398
The server will send log message with various severity levels to
321
<filename>/dev/log</filename>. With the
399
<filename class="devicefile">/dev/log</filename>. With the
322
400
<option>--debug</option> option, it will log even more messages,
323
401
and also show them on the console.
405
<refsect1 id="dbus_interface">
406
<title>D-BUS INTERFACE</title>
408
The server will by default provide a D-Bus system bus interface.
409
This interface will only be accessible by the root user or a
410
Mandos-specific user, if such a user exists. For documentation
411
of the D-Bus API, see the file <filename>DBUS-API</filename>.
327
415
<refsect1 id="exit_status">
328
416
<title>EXIT STATUS</title>
384
472
<term><filename>/var/run/mandos.pid</filename></term>
387
The file containing the process id of
388
<command>&COMMANDNAME;</command>.
475
The file containing the process id of the
476
<command>&COMMANDNAME;</command> process started last.
393
<term><filename>/dev/log</filename></term>
481
<term><filename class="devicefile">/dev/log</filename></term>
396
484
The Unix domain socket to where local syslog messages are
419
507
backtrace. This could be considered a feature.
422
Currently, if a client is declared <quote>invalid</quote> due to
423
having timed out, the server does not record this fact onto
424
permanent storage. This has some security implications, see
425
<xref linkend="clients"/>.
428
There is currently no way of querying the server of the current
429
status of clients, other than analyzing its <systemitem
430
class="service">syslog</systemitem> output.
510
Currently, if a client is disabled due to having timed out, the
511
server does not record this fact onto permanent storage. This
512
has some security implications, see <xref linkend="clients"/>.
433
515
There is no fine-grained control over logging and debug output.
517
596
If a client is compromised, its downtime should be duly noted
518
by the server which would therefore declare the client
519
invalid. But if the server was ever restarted, it would
520
re-read its client list from its configuration file and again
521
regard all clients therein as valid, and hence eligible to
522
receive their passwords. Therefore, be careful when
523
restarting servers if it is suspected that a client has, in
524
fact, been compromised by parties who may now be running a
525
fake Mandos client with the keys from the non-encrypted
526
initial <acronym>RAM</acronym> image of the client host. What
527
should be done in that case (if restarting the server program
528
really is necessary) is to stop the server program, edit the
529
configuration file to omit any suspect clients, and restart
597
by the server which would therefore disable the client. But
598
if the server was ever restarted, it would re-read its client
599
list from its configuration file and again regard all clients
600
therein as enabled, and hence eligible to receive their
601
passwords. Therefore, be careful when restarting servers if
602
it is suspected that a client has, in fact, been compromised
603
by parties who may now be running a fake Mandos client with
604
the keys from the non-encrypted initial <acronym>RAM</acronym>
605
image of the client host. What should be done in that case
606
(if restarting the server program really is necessary) is to
607
stop the server program, edit the configuration file to omit
608
any suspect clients, and restart the server program.
533
611
For more details on client-side security, see
540
618
<refsect1 id="see_also">
541
619
<title>SEE ALSO</title>
544
<refentrytitle>mandos-clients.conf</refentrytitle>
545
<manvolnum>5</manvolnum></citerefentry>, <citerefentry>
546
<refentrytitle>mandos.conf</refentrytitle>
547
<manvolnum>5</manvolnum></citerefentry>, <citerefentry>
548
<refentrytitle>mandos-client</refentrytitle>
549
<manvolnum>8mandos</manvolnum></citerefentry>, <citerefentry>
550
<refentrytitle>sh</refentrytitle><manvolnum>1</manvolnum>
621
<citerefentry><refentrytitle>intro</refentrytitle>
622
<manvolnum>8mandos</manvolnum></citerefentry>,
623
<citerefentry><refentrytitle>mandos-clients.conf</refentrytitle>
624
<manvolnum>5</manvolnum></citerefentry>,
625
<citerefentry><refentrytitle>mandos.conf</refentrytitle>
626
<manvolnum>5</manvolnum></citerefentry>,
627
<citerefentry><refentrytitle>mandos-client</refentrytitle>
628
<manvolnum>8mandos</manvolnum></citerefentry>,
629
<citerefentry><refentrytitle>sh</refentrytitle>
630
<manvolnum>1</manvolnum></citerefentry>