123
151
communicates with <citerefentry><refentrytitle
124
152
>mandos</refentrytitle><manvolnum>8</manvolnum></citerefentry>
125
153
to get a password. In slightly more detail, this client program
126
brings up a network interface, uses the interface’s IPv6
127
link-local address to get network connectivity, uses Zeroconf to
128
find servers on the local network, and communicates with servers
129
using TLS with an OpenPGP key to ensure authenticity and
154
brings up network interfaces, uses the interfaces’ IPv6
155
link-local addresses to get network connectivity, uses Zeroconf
156
to find servers on the local network, and communicates with
157
servers using TLS with an OpenPGP key to ensure authenticity and
130
158
confidentiality. This client program keeps running, trying all
131
159
servers on the network, until it receives a satisfactory reply
132
or a TERM signal is received. If no servers are found, or after
133
all servers have been tried, it waits indefinitely for new
160
or a TERM signal. After all servers have been tried, all
161
servers are periodically retried. If no servers are found it
162
will wait indefinitely for new servers to appear.
165
The network interfaces are selected like this: If any interfaces
166
are specified using the <option>--interface</option> option,
167
those interface are used. Otherwise,
168
<command>&COMMANDNAME;</command> will use all interfaces that
169
are not loopback interfaces, are not point-to-point interfaces,
170
are capable of broadcasting and do not have the NOARP flag (see
171
<citerefentry><refentrytitle>netdevice</refentrytitle>
172
<manvolnum>7</manvolnum></citerefentry>). (If the
173
<option>--connect</option> option is used, point-to-point
174
interfaces and non-broadcast interfaces are accepted.) If any
175
used interfaces are not up and running, they are first taken up
176
(and later taken down again on program exit).
179
Before network interfaces are selected, all <quote>network
180
hooks</quote> are run; see <xref linkend="network-hooks"/>.
137
183
This program is not meant to be run directly; it is really meant
184
230
assumed to separate the address from the port number.
187
This option is normally only useful for testing and
233
Normally, Zeroconf would be used to locate Mandos servers,
234
in which case this option would only be used when testing
194
<term><option>--interface=
195
<replaceable>NAME</replaceable></option></term>
241
<term><option>--interface=<replaceable
242
>NAME</replaceable><arg rep='repeat'>,<replaceable
243
>NAME</replaceable></arg></option></term>
197
<replaceable>NAME</replaceable></option></term>
245
<replaceable>NAME</replaceable><arg rep='repeat'>,<replaceable
246
>NAME</replaceable></arg></option></term>
200
Network interface that will be brought up and scanned for
201
Mandos servers to connect to. The default it
202
<quote><literal>eth0</literal></quote>.
249
Comma separated list of network interfaces that will be
250
brought up and scanned for Mandos servers to connect to.
251
The default is the empty string, which will automatically
252
use all appropriate interfaces.
205
If the <option>--connect</option> option is used, this
206
specifies the interface to use to connect to the address
255
If the <option>--connect</option> option is used, and
256
exactly one interface name is specified (except
257
<quote><literal>none</literal></quote>), this specifies
258
the interface to use to connect to the address given.
210
261
Note that since this program will normally run in the
211
262
initial RAM disk environment, the interface must be an
212
263
interface which exists at that stage. Thus, the interface
213
can not be a pseudo-interface such as <quote>br0</quote>
214
or <quote>tun0</quote>; such interfaces will not exist
215
until much later in the boot process, and can not be used
264
can normally not be a pseudo-interface such as
265
<quote>br0</quote> or <quote>tun0</quote>; such interfaces
266
will not exist until much later in the boot process, and
267
can not be used by this program, unless created by a
268
<quote>network hook</quote> — see <xref
269
linkend="network-hooks"/>.
272
<replaceable>NAME</replaceable> can be the string
273
<quote><literal>none</literal></quote>; this will make
274
<command>&COMMANDNAME;</command> only bring up interfaces
275
specified <emphasis>before</emphasis> this string. This
276
is not recommended, and only meant for advanced users.
263
323
Sets the number of bits to use for the prime number in the
264
TLS Diffie-Hellman key exchange. Default is 1024.
324
TLS Diffie-Hellman key exchange. The default value is
325
selected automatically based on the OpenPGP key. Note
326
that if the <option>--dh-params</option> option is used,
327
the values from that file will be used instead.
333
<term><option>--dh-params=<replaceable
334
>FILE</replaceable></option></term>
337
Specifies a PEM-encoded PKCS#3 file to read the parameters
338
needed by the TLS Diffie-Hellman key exchange from. If
339
this option is not given, or if the file for some reason
340
could not be used, the parameters will be generated on
341
startup, which will take some time and processing power.
342
Those using servers running under time, power or processor
343
constraints may want to generate such a file in advance
350
<term><option>--delay=<replaceable
351
>SECONDS</replaceable></option></term>
354
After bringing a network interface up, the program waits
355
for the interface to arrive in a <quote>running</quote>
356
state before proceeding. During this time, the kernel log
357
level will be lowered to reduce clutter on the system
358
console, alleviating any other plugins which might be
359
using the system console. This option sets the upper
360
limit of seconds to wait. The default is 2.5 seconds.
366
<term><option>--retry=<replaceable
367
>SECONDS</replaceable></option></term>
370
All Mandos servers are tried repeatedly until a password
371
is received. This value specifies, in seconds, how long
372
between each successive try <emphasis>for the same
373
server</emphasis>. The default is 10 seconds.
379
<term><option>--network-hook-dir=<replaceable
380
>DIR</replaceable></option></term>
383
Network hook directory. The default directory is
384
<quote><filename class="directory"
385
>/lib/mandos/network-hooks.d</filename></quote>.
343
466
server could be found and the password received from it could be
344
467
successfully decrypted and output on standard output. The
345
468
program will exit with a non-zero exit status only if a critical
346
error occurs. Otherwise, it will forever connect to new
347
<application>Mandos</application> servers as they appear, trying
348
to get a decryptable password and print it.
469
error occurs. Otherwise, it will forever connect to any
470
discovered <application>Mandos</application> servers, trying to
471
get a decryptable password and print it.
352
475
<refsect1 id="environment">
353
476
<title>ENVIRONMENT</title>
479
<term><envar>MANDOSPLUGINHELPERDIR</envar></term>
482
This environment variable will be assumed to contain the
483
directory containing any helper executables. The use and
484
nature of these helper executables, if any, is
485
purposefully not documented.
355
This program does not use any environment variables, not even
356
the ones provided by <citerefentry><refentrytitle
491
This program does not use any other environment variables, not
492
even the ones provided by <citerefentry><refentrytitle
357
493
>cryptsetup</refentrytitle><manvolnum>8</manvolnum>
498
<refsect1 id="network-hooks">
499
<title>NETWORK HOOKS</title>
501
If a network interface like a bridge or tunnel is required to
502
find a Mandos server, this requires the interface to be up and
503
running before <command>&COMMANDNAME;</command> starts looking
504
for Mandos servers. This can be accomplished by creating a
505
<quote>network hook</quote> program, and placing it in a special
509
Before the network is used (and again before program exit), any
510
runnable programs found in the network hook directory are run
511
with the argument <quote><literal>start</literal></quote> or
512
<quote><literal>stop</literal></quote>. This should bring up or
513
down, respectively, any network interface which
514
<command>&COMMANDNAME;</command> should use.
516
<refsect2 id="hook-requirements">
517
<title>REQUIREMENTS</title>
519
A network hook must be an executable file, and its name must
520
consist entirely of upper and lower case letters, digits,
521
underscores, periods, and hyphens.
524
A network hook will receive one argument, which can be one of
529
<term><literal>start</literal></term>
532
This should make the network hook create (if necessary)
533
and bring up a network interface.
538
<term><literal>stop</literal></term>
541
This should make the network hook take down a network
542
interface, and delete it if it did not exist previously.
547
<term><literal>files</literal></term>
550
This should make the network hook print, <emphasis>one
551
file per line</emphasis>, all the files needed for it to
552
run. (These files will be copied into the initial RAM
553
filesystem.) Typical use is for a network hook which is
554
a shell script to print its needed binaries.
557
It is not necessary to print any non-executable files
558
already in the network hook directory, these will be
559
copied implicitly if they otherwise satisfy the name
565
<term><literal>modules</literal></term>
568
This should make the network hook print, <emphasis>on
569
separate lines</emphasis>, all the kernel modules needed
570
for it to run. (These modules will be copied into the
571
initial RAM filesystem.) For instance, a tunnel
573
<quote><literal>tun</literal></quote> module.
579
The network hook will be provided with a number of environment
584
<term><envar>MANDOSNETHOOKDIR</envar></term>
587
The network hook directory, specified to
588
<command>&COMMANDNAME;</command> by the
589
<option>--network-hook-dir</option> option. Note: this
590
should <emphasis>always</emphasis> be used by the
591
network hook to refer to itself or any files in the hook
592
directory it may require.
597
<term><envar>DEVICE</envar></term>
600
The network interfaces, as specified to
601
<command>&COMMANDNAME;</command> by the
602
<option>--interface</option> option, combined to one
603
string and separated by commas. If this is set, and
604
does not contain the interface a hook will bring up,
605
there is no reason for a hook to continue.
610
<term><envar>MODE</envar></term>
613
This will be the same as the first argument;
614
i.e. <quote><literal>start</literal></quote>,
615
<quote><literal>stop</literal></quote>,
616
<quote><literal>files</literal></quote>, or
617
<quote><literal>modules</literal></quote>.
622
<term><envar>VERBOSITY</envar></term>
625
This will be the <quote><literal>1</literal></quote> if
626
the <option>--debug</option> option is passed to
627
<command>&COMMANDNAME;</command>, otherwise
628
<quote><literal>0</literal></quote>.
633
<term><envar>DELAY</envar></term>
636
This will be the same as the <option>--delay</option>
637
option passed to <command>&COMMANDNAME;</command>. Is
638
only set if <envar>MODE</envar> is
639
<quote><literal>start</literal></quote> or
640
<quote><literal>stop</literal></quote>.
645
<term><envar>CONNECT</envar></term>
648
This will be the same as the <option>--connect</option>
649
option passed to <command>&COMMANDNAME;</command>. Is
650
only set if <option>--connect</option> is passed and
651
<envar>MODE</envar> is
652
<quote><literal>start</literal></quote> or
653
<quote><literal>stop</literal></quote>.
659
A hook may not read from standard input, and should be
660
restrictive in printing to standard output or standard error
661
unless <varname>VERBOSITY</varname> is
662
<quote><literal>1</literal></quote>.
362
667
<refsect1 id="files">
363
668
<title>FILES</title>