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
4
<!ENTITY COMMANDNAME "mandos-client">
5
<!ENTITY TIMESTAMP "2023-10-21">
5
<!ENTITY TIMESTAMP "2016-07-10">
6
6
<!ENTITY % common SYSTEM "../common.ent">
96
93
<replaceable>FILE</replaceable></option></arg>
100
<arg choice="plain"><option>--tls-privkey
101
<replaceable>FILE</replaceable></option></arg>
102
<arg choice="plain"><option>-t
103
<replaceable>FILE</replaceable></option></arg>
107
<arg choice="plain"><option>--tls-pubkey
108
<replaceable>FILE</replaceable></option></arg>
109
<arg choice="plain"><option>-T
110
<replaceable>FILE</replaceable></option></arg>
114
97
<option>--priority <replaceable>STRING</replaceable></option>
169
152
brings up network interfaces, uses the interfaces’ IPv6
170
153
link-local addresses to get network connectivity, uses Zeroconf
171
154
to find servers on the local network, and communicates with
172
servers using TLS with a raw public key to ensure authenticity
173
and confidentiality. This client program keeps running, trying
174
all servers on the network, until it receives a satisfactory
175
reply or a TERM signal. After all servers have been tried, all
155
servers using TLS with an OpenPGP key to ensure authenticity and
156
confidentiality. This client program keeps running, trying all
157
servers on the network, until it receives a satisfactory reply
158
or a TERM signal. After all servers have been tried, all
176
159
servers are periodically retried. If no servers are found it
177
160
will wait indefinitely for new servers to appear.
198
181
This program is not meant to be run directly; it is really meant
199
to be run by other programs in the initial
200
<acronym>RAM</acronym> disk environment; see <xref
201
linkend="overview"/>.
182
to run as a plugin of the <application>Mandos</application>
183
<citerefentry><refentrytitle>plugin-runner</refentrytitle>
184
<manvolnum>8mandos</manvolnum></citerefentry>, which runs in the
185
initial <acronym>RAM</acronym> disk environment because it is
186
specified as a <quote>keyscript</quote> in the <citerefentry>
187
<refentrytitle>crypttab</refentrytitle><manvolnum>5</manvolnum>
188
</citerefentry> file.
216
203
<title>OPTIONS</title>
218
205
This program is commonly not invoked from the command line; it
219
is normally started by another program as described in <xref
220
linkend="description"/>. Any command line options this program
221
accepts are therefore normally provided by the invoking program,
206
is normally started by the <application>Mandos</application>
207
plugin runner, see <citerefentry><refentrytitle
208
>plugin-runner</refentrytitle><manvolnum>8mandos</manvolnum>
209
</citerefentry>. Any command line options this program accepts
210
are therefore normally provided by the plugin runner, and not
319
<term><option>--tls-pubkey=<replaceable
320
>FILE</replaceable></option></term>
322
<replaceable>FILE</replaceable></option></term>
325
TLS raw public key file name. The default name is
326
<quote><filename>/conf/conf.d/mandos/tls-pubkey.pem</filename
333
<term><option>--tls-privkey=<replaceable
334
>FILE</replaceable></option></term>
336
<replaceable>FILE</replaceable></option></term>
339
TLS secret key file name. The default name is
340
<quote><filename>/conf/conf.d/mandos/tls-privkey.pem</filename
347
308
<term><option>--priority=<replaceable
348
309
>STRING</replaceable></option></term>
360
321
Sets the number of bits to use for the prime number in the
361
322
TLS Diffie-Hellman key exchange. The default value is
362
selected automatically based on the GnuTLS security
363
profile set in its priority string. Note that if the
364
<option>--dh-params</option> option is used, the values
365
from that file will be used instead.
323
selected automatically based on the OpenPGP key. Note
324
that if the <option>--dh-params</option> option is used,
325
the values from that file will be used instead.
476
436
<title>OVERVIEW</title>
477
437
<xi:include href="../overview.xml"/>
479
This program is the client part. It is run automatically in an
480
initial <acronym>RAM</acronym> disk environment.
483
In an initial <acronym>RAM</acronym> disk environment using
484
<citerefentry><refentrytitle>systemd</refentrytitle>
485
<manvolnum>1</manvolnum></citerefentry>, this program is started
486
by the <application>Mandos</application> <citerefentry>
487
<refentrytitle>password-agent</refentrytitle>
488
<manvolnum>8mandos</manvolnum></citerefentry>, which in turn is
489
started automatically by the <citerefentry>
490
<refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum>
491
</citerefentry> <quote>Password Agent</quote> system.
494
In the case of a non-<citerefentry>
495
<refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum>
496
</citerefentry> environment, this program is started as a plugin
497
of the <application>Mandos</application> <citerefentry>
498
<refentrytitle>plugin-runner</refentrytitle>
499
<manvolnum>8mandos</manvolnum></citerefentry>, which runs in the
500
initial <acronym>RAM</acronym> disk environment because it is
501
specified as a <quote>keyscript</quote> in the <citerefentry>
502
<refentrytitle>crypttab</refentrytitle><manvolnum>5</manvolnum>
503
</citerefentry> file.
439
This program is the client part. It is a plugin started by
440
<citerefentry><refentrytitle>plugin-runner</refentrytitle>
441
<manvolnum>8mandos</manvolnum></citerefentry> which will run in
442
an initial <acronym>RAM</acronym> disk environment.
506
445
This program could, theoretically, be used as a keyscript in
507
446
<filename>/etc/crypttab</filename>, but it would then be
508
447
impossible to enter a password for the encrypted root disk at
509
448
the console, since this program does not read from the console
449
at all. This is why a separate plugin runner (<citerefentry>
450
<refentrytitle>plugin-runner</refentrytitle>
451
<manvolnum>8mandos</manvolnum></citerefentry>) is used to run
452
both this program and others in in parallel,
453
<emphasis>one</emphasis> of which (<citerefentry>
454
<refentrytitle>password-prompt</refentrytitle>
455
<manvolnum>8mandos</manvolnum></citerefentry>) will prompt for
456
passwords on the system console.
534
480
This environment variable will be assumed to contain the
535
481
directory containing any helper executables. The use and
536
nature of these helper executables, if any, is purposely
482
nature of these helper executables, if any, is
483
purposefully not documented.
737
<term><filename>/conf/conf.d/mandos/tls-pubkey.pem</filename
739
<term><filename>/conf/conf.d/mandos/tls-privkey.pem</filename
743
Public and private raw key files, in <quote>PEM</quote>
744
format. These are the default file names, they can be
745
changed with the <option>--tls-pubkey</option> and
746
<option>--tls-privkey</option> options.
752
684
class="directory">/lib/mandos/network-hooks.d</filename></term>
770
702
<title>EXAMPLE</title>
772
704
Note that normally, command line options will not be given
773
directly, but passed on via the program responsible for starting
774
this program; see <xref linkend="overview"/>.
705
directly, but via options for the Mandos <citerefentry
706
><refentrytitle>plugin-runner</refentrytitle>
707
<manvolnum>8mandos</manvolnum></citerefentry>.
776
709
<informalexample>
794
727
</informalexample>
795
728
<informalexample>
797
Run in debug mode, and use custom keys:
730
Run in debug mode, and use a custom key:
801
734
<!-- do not wrap this line -->
802
<userinput>&COMMANDNAME; --debug --pubkey keydir/pubkey.txt --seckey keydir/seckey.txt --tls-pubkey keydir/tls-pubkey.pem --tls-privkey keydir/tls-privkey.pem</userinput>
735
<userinput>&COMMANDNAME; --debug --pubkey keydir/pubkey.txt --seckey keydir/seckey.txt</userinput>
805
738
</informalexample>
806
739
<informalexample>
808
Run in debug mode, with custom keys, and do not use Zeroconf
741
Run in debug mode, with a custom key, and do not use Zeroconf
809
742
to locate a server; connect directly to the IPv6 link-local
810
743
address <quote><systemitem class="ipaddress"
811
744
>fe80::aede:48ff:fe71:f6f2</systemitem></quote>, port 4711,
823
756
<refsect1 id="security">
824
757
<title>SECURITY</title>
826
This program assumes that it is set-uid to root, and will switch
827
back to the original (and presumably non-privileged) user and
828
group after bringing up the network interface.
759
This program is set-uid to root, but will switch back to the
760
original (and presumably non-privileged) user and group after
761
bringing up the network interface.
831
764
To use this program for its intended purpose (see <xref
845
778
The only remaining weak point is that someone with physical
846
779
access to the client hard drive might turn off the client
847
computer, read the OpenPGP and TLS keys directly from the hard
848
drive, and communicate with the server. To safeguard against
849
this, the server is supposed to notice the client disappearing
850
and stop giving out the encrypted data. Therefore, it is
851
important to set the timeout and checker interval values tightly
852
on the server. See <citerefentry><refentrytitle
780
computer, read the OpenPGP keys directly from the hard drive,
781
and communicate with the server. To safeguard against this, the
782
server is supposed to notice the client disappearing and stop
783
giving out the encrypted data. Therefore, it is important to
784
set the timeout and checker interval values tightly on the
785
server. See <citerefentry><refentrytitle
853
786
>mandos</refentrytitle><manvolnum>8</manvolnum></citerefentry>.
879
812
<manvolnum>5</manvolnum></citerefentry>,
880
813
<citerefentry><refentrytitle>mandos</refentrytitle>
881
814
<manvolnum>8</manvolnum></citerefentry>,
882
<citerefentry><refentrytitle>password-agent</refentrytitle>
815
<citerefentry><refentrytitle>password-prompt</refentrytitle>
883
816
<manvolnum>8mandos</manvolnum></citerefentry>,
884
817
<citerefentry><refentrytitle>plugin-runner</refentrytitle>
885
818
<manvolnum>8mandos</manvolnum></citerefentry>
990
RFC 7250: <citetitle>Using Raw Public Keys in Transport
991
Layer Security (TLS) and Datagram Transport Layer Security
996
This is implemented by GnuTLS in version 3.6.6 and is, if
997
present, used by this program so that raw public keys can be
1004
923
RFC 6091: <citetitle>Using OpenPGP Keys for Transport Layer
1005
924
Security</citetitle>
1009
This is implemented by GnuTLS before version 3.6.0 and is,
1010
if present, used by this program so that OpenPGP keys can be
928
This is implemented by GnuTLS and used by this program so
929
that OpenPGP keys can be used.
added
removed
plugins.d/mandos-client.xml
