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">
5
<!ENTITY COMMANDNAME "password-request">
6
<!ENTITY TIMESTAMP "2008-09-04">
4
<!ENTITY COMMANDNAME "mandos-client">
5
<!ENTITY TIMESTAMP "2011-10-03">
6
<!ENTITY % common SYSTEM "../common.ent">
9
10
<refentry xmlns:xi="http://www.w3.org/2001/XInclude">
11
12
<title>Mandos Manual</title>
12
<!-- Nwalsh’s docbook scripts use this to generate the footer: -->
13
<!-- NWalsh’s docbook scripts use this to generate the footer: -->
13
14
<productname>Mandos</productname>
14
<productnumber>&VERSION;</productnumber>
15
<productnumber>&version;</productnumber>
15
16
<date>&TIMESTAMP;</date>
18
19
<firstname>Björn</firstname>
19
20
<surname>Påhlsson</surname>
21
<email>belorn@fukt.bsnet.se</email>
22
<email>belorn@recompile.se</email>
25
26
<firstname>Teddy</firstname>
26
27
<surname>Hogeborn</surname>
28
<email>teddy@fukt.bsnet.se</email>
29
<email>teddy@recompile.se</email>
34
37
<holder>Teddy Hogeborn</holder>
35
38
<holder>Björn Påhlsson</holder>
37
40
<xi:include href="../legalnotice.xml"/>
41
44
<refentrytitle>&COMMANDNAME;</refentrytitle>
42
45
<manvolnum>8mandos</manvolnum>
115
130
</refsynopsisdiv>
117
132
<refsect1 id="description">
118
133
<title>DESCRIPTION</title>
120
135
<command>&COMMANDNAME;</command> is a client program that
121
136
communicates with <citerefentry><refentrytitle
122
137
>mandos</refentrytitle><manvolnum>8</manvolnum></citerefentry>
123
to get a password. It uses IPv6 link-local addresses to get
124
network connectivity, Zeroconf to find servers, and TLS with an
125
OpenPGP key to ensure authenticity and confidentiality. It
126
keeps running, trying all servers on the network, until it
127
receives a satisfactory reply or a TERM signal is received.
138
to get a password. In slightly more detail, this client program
139
brings up a network interface, uses the interface’s IPv6
140
link-local address to get network connectivity, uses Zeroconf to
141
find servers on the local network, and communicates with servers
142
using TLS with an OpenPGP key to ensure authenticity and
143
confidentiality. This client program keeps running, trying all
144
servers on the network, until it receives a satisfactory reply
145
or a TERM signal. After all servers have been tried, all
146
servers are periodically retried. If no servers are found it
147
will wait indefinitely for new servers to appear.
130
150
This program is not meant to be run directly; it is really meant
187
<term><option>--interface=
188
<replaceable>NAME</replaceable></option></term>
207
<term><option>--interface=<replaceable
208
>NAME</replaceable></option></term>
190
210
<replaceable>NAME</replaceable></option></term>
193
213
Network interface that will be brought up and scanned for
194
Mandos servers to connect to. The default it
195
<quote><literal>eth0</literal></quote>.
214
Mandos servers to connect to. The default is the empty
215
string, which will automatically choose an appropriate
198
219
If the <option>--connect</option> option is used, this
199
220
specifies the interface to use to connect to the address
224
Note that since this program will normally run in the
225
initial RAM disk environment, the interface must be an
226
interface which exists at that stage. Thus, the interface
227
can not be a pseudo-interface such as <quote>br0</quote>
228
or <quote>tun0</quote>; such interfaces will not exist
229
until much later in the boot process, and can not be used
233
<replaceable>NAME</replaceable> can be the string
234
<quote><literal>none</literal></quote>; this will not use
235
any specific interface, and will not bring up an interface
236
on startup. This is not recommended, and only meant for
291
<term><option>--delay=<replaceable
292
>SECONDS</replaceable></option></term>
295
After bringing the network interface up, the program waits
296
for the interface to arrive in a <quote>running</quote>
297
state before proceeding. During this time, the kernel log
298
level will be lowered to reduce clutter on the system
299
console, alleviating any other plugins which might be
300
using the system console. This option sets the upper
301
limit of seconds to wait. The default is 2.5 seconds.
307
<term><option>--retry=<replaceable
308
>SECONDS</replaceable></option></term>
311
All Mandos servers are tried repeatedly until a password
312
is received. This value specifies, in seconds, how long
313
between each successive try <emphasis>for the same
314
server</emphasis>. The default is 10 seconds.
320
<term><option>--network-hook-dir=<replaceable
321
>DIR</replaceable></option></term>
324
Network hook directory. The default directory is
325
<quote><filename class="directory"
326
>/lib/mandos/network-hooks.d</filename></quote>.
254
332
<term><option>--debug</option></term>
311
389
<filename>/etc/crypttab</filename>, but it would then be
312
390
impossible to enter a password for the encrypted root disk at
313
391
the console, since this program does not read from the console
314
at all. This is why a separate plugin (<citerefentry>
315
<refentrytitle>password-prompt</refentrytitle>
316
<manvolnum>8mandos</manvolnum></citerefentry>) does that, which
317
will be run in parallel to this one by the plugin runner.
392
at all. This is why a separate plugin runner (<citerefentry>
393
<refentrytitle>plugin-runner</refentrytitle>
394
<manvolnum>8mandos</manvolnum></citerefentry>) is used to run
395
both this program and others in in parallel,
396
<emphasis>one</emphasis> of which will prompt for passwords on
325
405
server could be found and the password received from it could be
326
406
successfully decrypted and output on standard output. The
327
407
program will exit with a non-zero exit status only if a critical
328
error occurs. Otherwise, it will forever connect to new
329
<application>Mandos</application> servers as they appear, trying
330
to get a decryptable password.
408
error occurs. Otherwise, it will forever connect to any
409
discovered <application>Mandos</application> servers, trying to
410
get a decryptable password and print it.
408
488
<informalexample>
410
490
Run in debug mode, with a custom key, and do not use Zeroconf
411
to locate a server; connect directly to the IPv6 address
412
<quote><systemitem class="ipaddress"
413
>2001:db8:f983:bd0b:30de:ae4a:71f2:f672</systemitem></quote>,
414
port 4711, using interface eth2:
491
to locate a server; connect directly to the IPv6 link-local
492
address <quote><systemitem class="ipaddress"
493
>fe80::aede:48ff:fe71:f6f2</systemitem></quote>, port 4711,
494
using interface eth2:
418
498
<!-- do not wrap this line -->
419
<userinput>&COMMANDNAME; --debug --pubkey keydir/pubkey.txt --seckey keydir/seckey.txt --connect 2001:db8:f983:bd0b:30de:ae4a:71f2:f672:4711 --interface eth2</userinput>
499
<userinput>&COMMANDNAME; --debug --pubkey keydir/pubkey.txt --seckey keydir/seckey.txt --connect fe80::aede:48ff:fe71:f6f2:4711 --interface eth2</userinput>
422
502
</informalexample>
425
505
<refsect1 id="security">
426
506
<title>SECURITY</title>
447
527
The only remaining weak point is that someone with physical
448
528
access to the client hard drive might turn off the client
449
529
computer, read the OpenPGP keys directly from the hard drive,
450
and communicate with the server. The defense against this is
451
that the server is supposed to notice the client disappearing
452
and will stop giving out the encrypted data. Therefore, it is
453
important to set the timeout and checker interval values tightly
454
on the server. See <citerefentry><refentrytitle
530
and communicate with the server. To safeguard against this, the
531
server is supposed to notice the client disappearing and stop
532
giving out the encrypted data. Therefore, it is important to
533
set the timeout and checker interval values tightly on the
534
server. See <citerefentry><refentrytitle
455
535
>mandos</refentrytitle><manvolnum>8</manvolnum></citerefentry>.
472
552
<refsect1 id="see_also">
473
553
<title>SEE ALSO</title>
555
<citerefentry><refentrytitle>intro</refentrytitle>
556
<manvolnum>8mandos</manvolnum></citerefentry>,
475
557
<citerefentry><refentrytitle>cryptsetup</refentrytitle>
476
558
<manvolnum>8</manvolnum></citerefentry>,
477
559
<citerefentry><refentrytitle>crypttab</refentrytitle>
added
removed
plugins.d/mandos-client.xml
