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 COMMANDNAME "mandos-client">
5
<!ENTITY TIMESTAMP "2011-08-08">
6
<!ENTITY % common SYSTEM "../common.ent">
4
<!ENTITY VERSION "1.0">
5
<!ENTITY COMMANDNAME "password-request">
6
<!ENTITY TIMESTAMP "2008-09-03">
10
9
<refentry xmlns:xi="http://www.w3.org/2001/XInclude">
12
11
<title>Mandos Manual</title>
13
<!-- NWalsh’s docbook scripts use this to generate the footer: -->
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>
37
34
<holder>Teddy Hogeborn</holder>
38
35
<holder>Björn Påhlsson</holder>
40
37
<xi:include href="../legalnotice.xml"/>
44
41
<refentrytitle>&COMMANDNAME;</refentrytitle>
45
42
<manvolnum>8mandos</manvolnum>
49
46
<refname><command>&COMMANDNAME;</command></refname>
51
Client for <application>Mandos</application>
57
54
<command>&COMMANDNAME;</command>
59
56
<arg choice="plain"><option>--connect
60
<replaceable>ADDRESS</replaceable><literal>:</literal
57
<replaceable>IPADDR</replaceable><literal>:</literal
61
58
><replaceable>PORT</replaceable></option></arg>
62
59
<arg choice="plain"><option>-c
63
<replaceable>ADDRESS</replaceable><literal>:</literal
60
<replaceable>IPADDR</replaceable><literal>:</literal
64
61
><replaceable>PORT</replaceable></option></arg>
65
<arg choice="plain"><option>--keydir
66
<replaceable>DIRECTORY</replaceable></option></arg>
67
<arg choice="plain"><option>-d
68
<replaceable>DIRECTORY</replaceable></option></arg>
68
72
<arg choice="plain"><option>--interface
69
73
<replaceable>NAME</replaceable></option></arg>
70
74
<arg choice="plain"><option>-i
126
122
</refsynopsisdiv>
128
124
<refsect1 id="description">
129
125
<title>DESCRIPTION</title>
131
127
<command>&COMMANDNAME;</command> is a client program that
132
128
communicates with <citerefentry><refentrytitle
133
129
>mandos</refentrytitle><manvolnum>8</manvolnum></citerefentry>
134
to get a password. In slightly more detail, this client program
135
brings up a network interface, uses the interface’s IPv6
136
link-local address to get network connectivity, uses Zeroconf to
137
find servers on the local network, and communicates with servers
138
using TLS with an OpenPGP key to ensure authenticity and
139
confidentiality. This client program keeps running, trying all
140
servers on the network, until it receives a satisfactory reply
141
or a TERM signal. After all servers have been tried, all
142
servers are periodically retried. If no servers are found it
143
will wait indefinitely for new servers to appear.
130
to get a password. It uses IPv6 link-local addresses to get
131
network connectivity, Zeroconf to find servers, and TLS with an
132
OpenPGP key to ensure authenticity and confidentiality. It
133
keeps running, trying all servers on the network, until it
134
receives a satisfactory reply or a TERM signal is recieved.
146
137
This program is not meant to be run directly; it is really meant
203
<term><option>--interface=<replaceable
204
>NAME</replaceable></option></term>
194
<term><option>--keydir=<replaceable
195
>DIRECTORY</replaceable></option></term>
197
<replaceable>DIRECTORY</replaceable></option></term>
200
Directory to read the OpenPGP key files
201
<filename>pubkey.txt</filename> and
202
<filename>seckey.txt</filename> from. The default is
203
<filename>/conf/conf.d/mandos</filename> (in the initial
204
<acronym>RAM</acronym> disk environment).
210
<term><option>--interface=
211
<replaceable>NAME</replaceable></option></term>
206
213
<replaceable>NAME</replaceable></option></term>
209
216
Network interface that will be brought up and scanned for
210
Mandos servers to connect to. The default is the empty
211
string, which will automatically choose an appropriate
217
Mandos servers to connect to. The default it
218
<quote><literal>eth0</literal></quote>.
215
221
If the <option>--connect</option> option is used, this
216
222
specifies the interface to use to connect to the address
220
Note that since this program will normally run in the
221
initial RAM disk environment, the interface must be an
222
interface which exists at that stage. Thus, the interface
223
can not be a pseudo-interface such as <quote>br0</quote>
224
or <quote>tun0</quote>; such interfaces will not exist
225
until much later in the boot process, and can not be used
229
<replaceable>NAME</replaceable> can be the string
230
<quote><literal>none</literal></quote>; this will not use
231
any specific interface, and will not bring up an interface
232
on startup. This is not recommended, and only meant for
242
232
<replaceable>FILE</replaceable></option></term>
245
OpenPGP public key file name. The default name is
246
<quote><filename>/conf/conf.d/mandos/pubkey.txt</filename
235
OpenPGP public key file base name. This will be combined
236
with the directory from the <option>--keydir</option>
237
option to form an absolute file name. The default name is
238
<quote><literal>pubkey.txt</literal></quote>.
253
244
<term><option>--seckey=<replaceable
254
245
>FILE</replaceable></option></term>
256
247
<replaceable>FILE</replaceable></option></term>
259
OpenPGP secret key file name. The default name is
260
<quote><filename>/conf/conf.d/mandos/seckey.txt</filename
250
OpenPGP secret key file base name. This will be combined
251
with the directory from the <option>--keydir</option>
252
option to form an absolute file name. The default name is
253
<quote><literal>seckey.txt</literal></quote>.
287
<term><option>--delay=<replaceable
288
>SECONDS</replaceable></option></term>
291
After bringing the network interface up, the program waits
292
for the interface to arrive in a <quote>running</quote>
293
state before proceeding. During this time, the kernel log
294
level will be lowered to reduce clutter on the system
295
console, alleviating any other plugins which might be
296
using the system console. This option sets the upper
297
limit of seconds to wait. The default is 2.5 seconds.
303
<term><option>--retry=<replaceable
304
>SECONDS</replaceable></option></term>
307
All Mandos servers are tried repeatedly until a password
308
is received. This value specifies, in seconds, how long
309
between each successive try <emphasis>for the same
310
server</emphasis>. The default is 10 seconds.
316
279
<term><option>--debug</option></term>
373
336
<filename>/etc/crypttab</filename>, but it would then be
374
337
impossible to enter a password for the encrypted root disk at
375
338
the console, since this program does not read from the console
376
at all. This is why a separate plugin runner (<citerefentry>
377
<refentrytitle>plugin-runner</refentrytitle>
378
<manvolnum>8mandos</manvolnum></citerefentry>) is used to run
379
both this program and others in in parallel,
380
<emphasis>one</emphasis> of which will prompt for passwords on
339
at all. This is why a separate plugin (<citerefentry>
340
<refentrytitle>password-prompt</refentrytitle>
341
<manvolnum>8mandos</manvolnum></citerefentry>) does that, which
342
will be run in parallell to this one by the plugin runner.
389
350
server could be found and the password received from it could be
390
351
successfully decrypted and output on standard output. The
391
352
program will exit with a non-zero exit status only if a critical
392
error occurs. Otherwise, it will forever connect to any
393
discovered <application>Mandos</application> servers, trying to
394
get a decryptable password and print it.
353
error occurs. Otherwise, it will forever connect to new
354
<application>Mandos</application> servers as they appear, trying
355
to get a decryptable password.
460
420
</informalexample>
461
421
<informalexample>
463
Run in debug mode, and use a custom key:
423
Run in debug mode, and use a custom key directory:
467
<!-- do not wrap this line -->
468
<userinput>&COMMANDNAME; --debug --pubkey keydir/pubkey.txt --seckey keydir/seckey.txt</userinput>
426
<!-- do not wrap this line -->
427
<userinput>&COMMANDNAME; --debug --keydir keydir</userinput>
471
429
</informalexample>
472
430
<informalexample>
474
Run in debug mode, with a custom key, and do not use Zeroconf
475
to locate a server; connect directly to the IPv6 link-local
432
Run in debug mode, with a custom key directory, and do not use
433
Zeroconf to locate a server; connect directly to the IPv6
476
434
address <quote><systemitem class="ipaddress"
477
>fe80::aede:48ff:fe71:f6f2</systemitem></quote>, port 4711,
478
using interface eth2:
435
>2001:db8:f983:bd0b:30de:ae4a:71f2:f672</systemitem></quote>,
436
port 4711, using interface eth2:
482
440
<!-- do not wrap this line -->
483
<userinput>&COMMANDNAME; --debug --pubkey keydir/pubkey.txt --seckey keydir/seckey.txt --connect fe80::aede:48ff:fe71:f6f2:4711 --interface eth2</userinput>
441
<userinput>&COMMANDNAME; --debug --keydir keydir --connect 2001:db8:f983:bd0b:30de:ae4a:71f2:f672:4711 --interface eth2</userinput>
486
444
</informalexample>
489
447
<refsect1 id="security">
490
448
<title>SECURITY</title>
511
469
The only remaining weak point is that someone with physical
512
470
access to the client hard drive might turn off the client
513
471
computer, read the OpenPGP keys directly from the hard drive,
514
and communicate with the server. To safeguard against this, the
515
server is supposed to notice the client disappearing and stop
516
giving out the encrypted data. Therefore, it is important to
517
set the timeout and checker interval values tightly on the
518
server. See <citerefentry><refentrytitle
472
and communicate with the server. The defense against this is
473
that the server is supposed to notice the client disappearing
474
and will stop giving out the encrypted data. Therefore, it is
475
important to set the timeout and checker interval values tightly
476
on the server. See <citerefentry><refentrytitle
519
477
>mandos</refentrytitle><manvolnum>8</manvolnum></citerefentry>.
536
494
<refsect1 id="see_also">
537
495
<title>SEE ALSO</title>
539
<citerefentry><refentrytitle>intro</refentrytitle>
540
<manvolnum>8mandos</manvolnum></citerefentry>,
541
497
<citerefentry><refentrytitle>cryptsetup</refentrytitle>
542
498
<manvolnum>8</manvolnum></citerefentry>,
543
499
<citerefentry><refentrytitle>crypttab</refentrytitle>