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 "2008-09-03">
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>
46
49
<refname><command>&COMMANDNAME;</command></refname>
51
Client for <application>Mandos</application>
54
57
<command>&COMMANDNAME;</command>
56
59
<arg choice="plain"><option>--connect
57
<replaceable>IPADDR</replaceable><literal>:</literal
60
<replaceable>ADDRESS</replaceable><literal>:</literal
58
61
><replaceable>PORT</replaceable></option></arg>
59
62
<arg choice="plain"><option>-c
60
<replaceable>IPADDR</replaceable><literal>:</literal
63
<replaceable>ADDRESS</replaceable><literal>:</literal
61
64
><replaceable>PORT</replaceable></option></arg>
115
126
</refsynopsisdiv>
117
128
<refsect1 id="description">
118
129
<title>DESCRIPTION</title>
120
131
<command>&COMMANDNAME;</command> is a client program that
121
132
communicates with <citerefentry><refentrytitle
122
133
>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 recieved.
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
146
This program is not meant to be run directly; it is really meant
187
<term><option>--interface=
188
<replaceable>NAME</replaceable></option></term>
203
<term><option>--interface=<replaceable
204
>NAME</replaceable></option></term>
190
206
<replaceable>NAME</replaceable></option></term>
193
209
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>.
210
Mandos servers to connect to. The default is the empty
211
string, which will automatically choose an appropriate
198
215
If the <option>--connect</option> option is used, this
199
216
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
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.
254
316
<term><option>--debug</option></term>
311
373
<filename>/etc/crypttab</filename>, but it would then be
312
374
impossible to enter a password for the encrypted root disk at
313
375
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 parallell to this one by the plugin runner.
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
325
389
server could be found and the password received from it could be
326
390
successfully decrypted and output on standard output. The
327
391
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.
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.
407
472
<informalexample>
409
474
Run in debug mode, with a custom key, and do not use Zeroconf
410
to locate a server; connect directly to the IPv6 address
411
<quote><systemitem class="ipaddress"
412
>2001:db8:f983:bd0b:30de:ae4a:71f2:f672</systemitem></quote>,
413
port 4711, using interface eth2:
475
to locate a server; connect directly to the IPv6 link-local
476
address <quote><systemitem class="ipaddress"
477
>fe80::aede:48ff:fe71:f6f2</systemitem></quote>, port 4711,
478
using interface eth2:
417
482
<!-- do not wrap this line -->
418
<userinput>&COMMANDNAME; --debug --pubkey keydir/pubkey.txt --seckey keydir/seckey.txt --connect 2001:db8:f983:bd0b:30de:ae4a:71f2:f672:4711 --interface eth2</userinput>
483
<userinput>&COMMANDNAME; --debug --pubkey keydir/pubkey.txt --seckey keydir/seckey.txt --connect fe80::aede:48ff:fe71:f6f2:4711 --interface eth2</userinput>
421
486
</informalexample>
424
489
<refsect1 id="security">
425
490
<title>SECURITY</title>
446
511
The only remaining weak point is that someone with physical
447
512
access to the client hard drive might turn off the client
448
513
computer, read the OpenPGP keys directly from the hard drive,
449
and communicate with the server. The defense against this is
450
that the server is supposed to notice the client disappearing
451
and will stop giving out the encrypted data. Therefore, it is
452
important to set the timeout and checker interval values tightly
453
on the server. See <citerefentry><refentrytitle
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
454
519
>mandos</refentrytitle><manvolnum>8</manvolnum></citerefentry>.
471
536
<refsect1 id="see_also">
472
537
<title>SEE ALSO</title>
539
<citerefentry><refentrytitle>intro</refentrytitle>
540
<manvolnum>8mandos</manvolnum></citerefentry>,
474
541
<citerefentry><refentrytitle>cryptsetup</refentrytitle>
475
542
<manvolnum>8</manvolnum></citerefentry>,
476
543
<citerefentry><refentrytitle>crypttab</refentrytitle>
added
removed
plugins.d/mandos-client.xml
