1
1
<?xml version="1.0" encoding="UTF-8"?>
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
<!ENTITY VERSION "1.0">
4
5
<!ENTITY COMMANDNAME "mandos">
5
<!ENTITY TIMESTAMP "2010-09-25">
6
<!ENTITY % common SYSTEM "common.ent">
6
<!ENTITY TIMESTAMP "2008-09-01">
10
9
<refentry xmlns:xi="http://www.w3.org/2001/XInclude">
12
11
<title>Mandos Manual</title>
13
12
<!-- NWalsh’s docbook scripts use this to generate the footer: -->
14
13
<productname>Mandos</productname>
15
<productnumber>&version;</productnumber>
14
<productnumber>&VERSION;</productnumber>
16
15
<date>&TIMESTAMP;</date>
85
83
<replaceable>DIRECTORY</replaceable></option></arg>
87
85
<arg><option>--debug</option></arg>
89
<arg><option>--no-dbus</option></arg>
91
<arg><option>--no-ipv6</option></arg>
94
88
<command>&COMMANDNAME;</command>
121
115
Any authenticated client is then given the stored pre-encrypted
122
116
password for that specific client.
126
121
<refsect1 id="purpose">
127
122
<title>PURPOSE</title>
129
125
The purpose of this is to enable <emphasis>remote and unattended
130
126
rebooting</emphasis> of client host computer with an
131
127
<emphasis>encrypted root file system</emphasis>. See <xref
132
128
linkend="overview"/> for details.
136
133
<refsect1 id="options">
137
134
<title>OPTIONS</title>
140
138
<term><option>--help</option></term>
238
<term><option>--no-dbus</option></term>
240
<xi:include href="mandos-options.xml" xpointer="dbus"/>
242
See also <xref linkend="dbus_interface"/>.
248
<term><option>--no-ipv6</option></term>
250
<xi:include href="mandos-options.xml" xpointer="ipv6"/>
256
237
<refsect1 id="overview">
257
238
<title>OVERVIEW</title>
258
239
<xi:include href="overview.xml"/>
321
302
</tbody></tgroup></table>
324
305
<refsect1 id="checking">
325
306
<title>CHECKING</title>
327
308
The server will, by default, continually check that the clients
328
309
are still up. If a client has not been confirmed as being up
329
310
for some time, the client is assumed to be compromised and is no
330
longer eligible to receive the encrypted password. (Manual
331
intervention is required to re-enable a client.) The timeout,
311
longer eligible to receive the encrypted password. The timeout,
332
312
checker program, and interval between checks can be configured
333
313
both globally and per client; see <citerefentry>
334
314
<refentrytitle>mandos-clients.conf</refentrytitle>
335
<manvolnum>5</manvolnum></citerefentry>. A client successfully
336
receiving its password will also be treated as a successful
341
<refsect1 id="approval">
342
<title>APPROVAL</title>
344
The server can be configured to require manual approval for a
345
client before it is sent its secret. The delay to wait for such
346
approval and the default action (approve or deny) can be
347
configured both globally and per client; see <citerefentry>
348
<refentrytitle>mandos-clients.conf</refentrytitle>
349
<manvolnum>5</manvolnum></citerefentry>. By default all clients
350
will be approved immediately without delay.
353
This can be used to deny a client its secret if not manually
354
approved within a specified time. It can also be used to make
355
the server delay before giving a client its secret, allowing
356
optional manual denying of this specific client.
315
<manvolnum>5</manvolnum></citerefentry>.
361
319
<refsect1 id="logging">
362
320
<title>LOGGING</title>
367
325
and also show them on the console.
371
<refsect1 id="dbus_interface">
372
<title>D-BUS INTERFACE</title>
374
The server will by default provide a D-Bus system bus interface.
375
This interface will only be accessible by the root user or a
376
Mandos-specific user, if such a user exists. For documentation
377
of the D-Bus API, see the file <filename>DBUS-API</filename>.
381
329
<refsect1 id="exit_status">
382
330
<title>EXIT STATUS</title>
438
<term><filename>/var/run/mandos.pid</filename></term>
386
<term><filename>/var/run/mandos/mandos.pid</filename></term>
441
The file containing the process id of the
442
<command>&COMMANDNAME;</command> process started last.
389
The file containing the process id of
390
<command>&COMMANDNAME;</command>.
473
421
backtrace. This could be considered a feature.
476
Currently, if a client is disabled due to having timed out, the
477
server does not record this fact onto permanent storage. This
478
has some security implications, see <xref linkend="clients"/>.
424
Currently, if a client is declared <quote>invalid</quote> due to
425
having timed out, the server does not record this fact onto
426
permanent storage. This has some security implications, see
427
<xref linkend="CLIENTS"/>.
430
There is currently no way of querying the server of the current
431
status of clients, other than analyzing its <systemitem
432
class="service">syslog</systemitem> output.
481
435
There is no fine-grained control over logging and debug output.
484
438
Debug mode is conflated with running in the foreground.
487
The console log messages do not show a time stamp.
490
This server does not check the expire time of clients’ OpenPGP
441
The console log messages does not show a timestamp.
530
480
</informalexample>
533
483
<refsect1 id="security">
534
484
<title>SECURITY</title>
535
<refsect2 id="server">
485
<refsect2 id="SERVER">
536
486
<title>SERVER</title>
538
488
Running this <command>&COMMANDNAME;</command> server program
539
489
should not in itself present any security risk to the host
540
computer running it. The program switches to a non-root user
490
computer running it. The program does not need any special
491
privileges to run, and is designed to run as a non-root user.
544
<refsect2 id="clients">
494
<refsect2 id="CLIENTS">
545
495
<title>CLIENTS</title>
547
497
The server only gives out its stored data to clients which
554
504
<citerefentry><refentrytitle>mandos-clients.conf</refentrytitle>
555
505
<manvolnum>5</manvolnum></citerefentry>)
556
506
<emphasis>must</emphasis> be made non-readable by anyone
557
except the user starting the server (usually root).
507
except the user running the server.
560
510
As detailed in <xref linkend="checking"/>, the status of all
565
515
If a client is compromised, its downtime should be duly noted
566
by the server which would therefore disable the client. But
567
if the server was ever restarted, it would re-read its client
568
list from its configuration file and again regard all clients
569
therein as enabled, and hence eligible to receive their
570
passwords. Therefore, be careful when restarting servers if
571
it is suspected that a client has, in fact, been compromised
572
by parties who may now be running a fake Mandos client with
573
the keys from the non-encrypted initial <acronym>RAM</acronym>
574
image of the client host. What should be done in that case
575
(if restarting the server program really is necessary) is to
576
stop the server program, edit the configuration file to omit
577
any suspect clients, and restart the server program.
516
by the server which would therefore declare the client
517
invalid. But if the server was ever restarted, it would
518
re-read its client list from its configuration file and again
519
regard all clients therein as valid, and hence eligible to
520
receive their passwords. Therefore, be careful when
521
restarting servers if it is suspected that a client has, in
522
fact, been compromised by parties who may now be running a
523
fake Mandos client with the keys from the non-encrypted
524
initial <acronym>RAM</acronym> image of the client host. What
525
should be done in that case (if restarting the server program
526
really is necessary) is to stop the server program, edit the
527
configuration file to omit any suspect clients, and restart
580
531
For more details on client-side security, see
581
<citerefentry><refentrytitle>mandos-client</refentrytitle>
532
<citerefentry><refentrytitle>password-request</refentrytitle>
582
533
<manvolnum>8mandos</manvolnum></citerefentry>.
587
538
<refsect1 id="see_also">
588
539
<title>SEE ALSO</title>
592
543
<manvolnum>5</manvolnum></citerefentry>, <citerefentry>
593
544
<refentrytitle>mandos.conf</refentrytitle>
594
545
<manvolnum>5</manvolnum></citerefentry>, <citerefentry>
595
<refentrytitle>mandos-client</refentrytitle>
546
<refentrytitle>password-request</refentrytitle>
596
547
<manvolnum>8mandos</manvolnum></citerefentry>, <citerefentry>
597
548
<refentrytitle>sh</refentrytitle><manvolnum>1</manvolnum>