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 "2011-02-27">
6
<!ENTITY % common SYSTEM "common.ent">
6
<!ENTITY TIMESTAMP "2008-08-31">
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>
38
34
<holder>Teddy Hogeborn</holder>
39
35
<holder>Björn Påhlsson</holder>
41
<xi:include href="legalnotice.xml"/>
39
This manual page is free software: you can redistribute it
40
and/or modify it under the terms of the GNU General Public
41
License as published by the Free Software Foundation,
42
either version 3 of the License, or (at your option) any
47
This manual page is distributed in the hope that it will
48
be useful, but WITHOUT ANY WARRANTY; without even the
49
implied warranty of MERCHANTABILITY or FITNESS FOR A
50
PARTICULAR PURPOSE. See the GNU General Public License
55
You should have received a copy of the GNU General Public
56
License along with this program; If not, see
57
<ulink url="http://www.gnu.org/licenses/"/>.
45
63
<refentrytitle>&COMMANDNAME;</refentrytitle>
46
64
<manvolnum>8</manvolnum>
87
105
<replaceable>DIRECTORY</replaceable></option></arg>
89
107
<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>
99
110
<command>&COMMANDNAME;</command>
126
137
Any authenticated client is then given the stored pre-encrypted
127
138
password for that specific client.
131
143
<refsect1 id="purpose">
132
144
<title>PURPOSE</title>
134
147
The purpose of this is to enable <emphasis>remote and unattended
135
148
rebooting</emphasis> of client host computer with an
136
149
<emphasis>encrypted root file system</emphasis>. See <xref
137
150
linkend="overview"/> for details.
141
155
<refsect1 id="options">
142
156
<title>OPTIONS</title>
145
160
<term><option>--help</option></term>
197
212
<xi:include href="mandos-options.xml" xpointer="debug"/>
202
<term><option>--debuglevel
203
<replaceable>LEVEL</replaceable></option></term>
206
Set the debugging log level.
207
<replaceable>LEVEL</replaceable> is a string, one of
208
<quote><literal>CRITICAL</literal></quote>,
209
<quote><literal>ERROR</literal></quote>,
210
<quote><literal>WARNING</literal></quote>,
211
<quote><literal>INFO</literal></quote>, or
212
<quote><literal>DEBUG</literal></quote>, in order of
213
increasing verbosity. The default level is
214
<quote><literal>WARNING</literal></quote>.
220
217
<term><option>--priority <replaceable>
221
218
PRIORITY</replaceable></option></term>
261
<term><option>--no-dbus</option></term>
263
<xi:include href="mandos-options.xml" xpointer="dbus"/>
265
See also <xref linkend="dbus_interface"/>.
271
<term><option>--no-ipv6</option></term>
273
<xi:include href="mandos-options.xml" xpointer="ipv6"/>
279
259
<refsect1 id="overview">
280
260
<title>OVERVIEW</title>
281
261
<xi:include href="overview.xml"/>
283
263
This program is the server part. It is a normal server program
284
264
and will run in a normal system environment, not in an initial
285
<acronym>RAM</acronym> disk environment.
265
RAM disk environment.
289
269
<refsect1 id="protocol">
290
270
<title>NETWORK PROTOCOL</title>
344
324
</tbody></tgroup></table>
347
327
<refsect1 id="checking">
348
328
<title>CHECKING</title>
350
330
The server will, by default, continually check that the clients
351
331
are still up. If a client has not been confirmed as being up
352
332
for some time, the client is assumed to be compromised and is no
353
longer eligible to receive the encrypted password. (Manual
354
intervention is required to re-enable a client.) The timeout,
333
longer eligible to receive the encrypted password. The timeout,
355
334
checker program, and interval between checks can be configured
356
335
both globally and per client; see <citerefentry>
357
336
<refentrytitle>mandos-clients.conf</refentrytitle>
358
<manvolnum>5</manvolnum></citerefentry>. A client successfully
359
receiving its password will also be treated as a successful
364
<refsect1 id="approval">
365
<title>APPROVAL</title>
367
The server can be configured to require manual approval for a
368
client before it is sent its secret. The delay to wait for such
369
approval and the default action (approve or deny) can be
370
configured both globally and per client; see <citerefentry>
371
<refentrytitle>mandos-clients.conf</refentrytitle>
372
<manvolnum>5</manvolnum></citerefentry>. By default all clients
373
will be approved immediately without delay.
376
This can be used to deny a client its secret if not manually
377
approved within a specified time. It can also be used to make
378
the server delay before giving a client its secret, allowing
379
optional manual denying of this specific client.
337
<manvolnum>5</manvolnum></citerefentry>.
384
341
<refsect1 id="logging">
385
342
<title>LOGGING</title>
390
347
and also show them on the console.
394
<refsect1 id="dbus_interface">
395
<title>D-BUS INTERFACE</title>
397
The server will by default provide a D-Bus system bus interface.
398
This interface will only be accessible by the root user or a
399
Mandos-specific user, if such a user exists. For documentation
400
of the D-Bus API, see the file <filename>DBUS-API</filename>.
404
351
<refsect1 id="exit_status">
405
352
<title>EXIT STATUS</title>
461
<term><filename>/var/run/mandos.pid</filename></term>
408
<term><filename>/var/run/mandos/mandos.pid</filename></term>
464
The file containing the process id of the
465
<command>&COMMANDNAME;</command> process started last.
411
The file containing the process id of
412
<command>&COMMANDNAME;</command>.
496
443
backtrace. This could be considered a feature.
499
Currently, if a client is disabled due to having timed out, the
500
server does not record this fact onto permanent storage. This
501
has some security implications, see <xref linkend="clients"/>.
446
Currently, if a client is declared <quote>invalid</quote> due to
447
having timed out, the server does not record this fact onto
448
permanent storage. This has some security implications, see
449
<xref linkend="CLIENTS"/>.
452
There is currently no way of querying the server of the current
453
status of clients, other than analyzing its <systemitem
454
class="service">syslog</systemitem> output.
504
457
There is no fine-grained control over logging and debug output.
507
460
Debug mode is conflated with running in the foreground.
510
The console log messages do not show a time stamp.
513
This server does not check the expire time of clients’ OpenPGP
463
The console log messages does not show a timestamp.
553
502
</informalexample>
556
505
<refsect1 id="security">
557
506
<title>SECURITY</title>
558
<refsect2 id="server">
507
<refsect2 id="SERVER">
559
508
<title>SERVER</title>
561
510
Running this <command>&COMMANDNAME;</command> server program
562
511
should not in itself present any security risk to the host
563
computer running it. The program switches to a non-root user
512
computer running it. The program does not need any special
513
privileges to run, and is designed to run as a non-root user.
567
<refsect2 id="clients">
516
<refsect2 id="CLIENTS">
568
517
<title>CLIENTS</title>
570
519
The server only gives out its stored data to clients which
577
526
<citerefentry><refentrytitle>mandos-clients.conf</refentrytitle>
578
527
<manvolnum>5</manvolnum></citerefentry>)
579
528
<emphasis>must</emphasis> be made non-readable by anyone
580
except the user starting the server (usually root).
529
except the user running the server.
583
532
As detailed in <xref linkend="checking"/>, the status of all
588
537
If a client is compromised, its downtime should be duly noted
589
by the server which would therefore disable the client. But
590
if the server was ever restarted, it would re-read its client
591
list from its configuration file and again regard all clients
592
therein as enabled, and hence eligible to receive their
593
passwords. Therefore, be careful when restarting servers if
594
it is suspected that a client has, in fact, been compromised
595
by parties who may now be running a fake Mandos client with
596
the keys from the non-encrypted initial <acronym>RAM</acronym>
597
image of the client host. What should be done in that case
598
(if restarting the server program really is necessary) is to
599
stop the server program, edit the configuration file to omit
600
any suspect clients, and restart the server program.
538
by the server which would therefore declare the client
539
invalid. But if the server was ever restarted, it would
540
re-read its client list from its configuration file and again
541
regard all clients therein as valid, and hence eligible to
542
receive their passwords. Therefore, be careful when
543
restarting servers if it is suspected that a client has, in
544
fact, been compromised by parties who may now be running a
545
fake Mandos client with the keys from the non-encrypted
546
initial RAM image of the client host. What should be done in
547
that case (if restarting the server program really is
548
necessary) is to stop the server program, edit the
549
configuration file to omit any suspect clients, and restart
603
553
For more details on client-side security, see
604
<citerefentry><refentrytitle>mandos-client</refentrytitle>
554
<citerefentry><refentrytitle>password-request</refentrytitle>
605
555
<manvolnum>8mandos</manvolnum></citerefentry>.
610
560
<refsect1 id="see_also">
611
561
<title>SEE ALSO</title>
615
565
<manvolnum>5</manvolnum></citerefentry>, <citerefentry>
616
566
<refentrytitle>mandos.conf</refentrytitle>
617
567
<manvolnum>5</manvolnum></citerefentry>, <citerefentry>
618
<refentrytitle>mandos-client</refentrytitle>
568
<refentrytitle>password-request</refentrytitle>
619
569
<manvolnum>8mandos</manvolnum></citerefentry>, <citerefentry>
620
570
<refentrytitle>sh</refentrytitle><manvolnum>1</manvolnum>