148
127
communicates with <citerefentry><refentrytitle
149
128
>mandos</refentrytitle><manvolnum>8</manvolnum></citerefentry>
150
129
to get a password. In slightly more detail, this client program
151
brings up network interfaces, uses the interfaces’ IPv6
152
link-local addresses to get network connectivity, uses Zeroconf
153
to find servers on the local network, and communicates with
154
servers using TLS with an OpenPGP key to ensure authenticity and
130
brings up a network interface, uses the interface’s IPv6
131
link-local address to get network connectivity, uses Zeroconf to
132
find servers on the local network, and communicates with servers
133
using TLS with an OpenPGP key to ensure authenticity and
155
134
confidentiality. This client program keeps running, trying all
156
135
servers on the network, until it receives a satisfactory reply
157
or a TERM signal. After all servers have been tried, all
158
servers are periodically retried. If no servers are found it
159
will wait indefinitely for new servers to appear.
162
The network interfaces are selected like this: If any interfaces
163
are specified using the <option>--interface</option> option,
164
those interface are used. Otherwise,
165
<command>&COMMANDNAME;</command> will use all interfaces that
166
are not loopback interfaces, are not point-to-point interfaces,
167
are capable of broadcasting and do not have the NOARP flag (see
168
<citerefentry><refentrytitle>netdevice</refentrytitle>
169
<manvolnum>7</manvolnum></citerefentry>). (If the
170
<option>--connect</option> option is used, point-to-point
171
interfaces and non-broadcast interfaces are accepted.) If any
172
used interfaces are not up and running, they are first taken up
173
(and later taken down again on program exit).
176
Before network interfaces are selected, all <quote>network
177
hooks</quote> are run; see <xref linkend="network-hooks"/>.
136
or a TERM signal is received. If no servers are found, or after
137
all servers have been tried, it waits indefinitely for new
180
141
This program is not meant to be run directly; it is really meant
227
188
assumed to separate the address from the port number.
230
Normally, Zeroconf would be used to locate Mandos servers,
231
in which case this option would only be used when testing
191
This option is normally only useful for testing and
238
198
<term><option>--interface=<replaceable
239
>NAME</replaceable><arg rep='repeat'>,<replaceable
240
>NAME</replaceable></arg></option></term>
199
>NAME</replaceable></option></term>
242
<replaceable>NAME</replaceable><arg rep='repeat'>,<replaceable
243
>NAME</replaceable></arg></option></term>
201
<replaceable>NAME</replaceable></option></term>
246
Comma separated list of network interfaces that will be
247
brought up and scanned for Mandos servers to connect to.
248
The default is the empty string, which will automatically
249
use all appropriate interfaces.
204
Network interface that will be brought up and scanned for
205
Mandos servers to connect to. The default is
206
<quote><literal>eth0</literal></quote>.
252
If the <option>--connect</option> option is used, and
253
exactly one interface name is specified (except
254
<quote><literal>none</literal></quote>), this specifies
255
the interface to use to connect to the address given.
209
If the <option>--connect</option> option is used, this
210
specifies the interface to use to connect to the address
258
214
Note that since this program will normally run in the
259
215
initial RAM disk environment, the interface must be an
260
216
interface which exists at that stage. Thus, the interface
261
can normally not be a pseudo-interface such as
262
<quote>br0</quote> or <quote>tun0</quote>; such interfaces
263
will not exist until much later in the boot process, and
264
can not be used by this program, unless created by a
265
<quote>network hook</quote> — see <xref
266
linkend="network-hooks"/>.
217
can not be a pseudo-interface such as <quote>br0</quote>
218
or <quote>tun0</quote>; such interfaces will not exist
219
until much later in the boot process, and can not be used
269
<replaceable>NAME</replaceable> can be the string
270
<quote><literal>none</literal></quote>; this will make
271
<command>&COMMANDNAME;</command> only bring up interfaces
272
specified <emphasis>before</emphasis> this string. This
273
is not recommended, and only meant for advanced users.
223
<replaceable>NAME</replaceable> can be the empty string;
224
this will not use any specific interface, and will not
225
bring up an interface on startup. This is not
226
recommended, and only meant for advanced users.
463
369
server could be found and the password received from it could be
464
370
successfully decrypted and output on standard output. The
465
371
program will exit with a non-zero exit status only if a critical
466
error occurs. Otherwise, it will forever connect to any
467
discovered <application>Mandos</application> servers, trying to
468
get a decryptable password and print it.
372
error occurs. Otherwise, it will forever connect to new
373
<application>Mandos</application> servers as they appear, trying
374
to get a decryptable password and print it.
472
378
<refsect1 id="environment">
473
379
<title>ENVIRONMENT</title>
476
<term><envar>MANDOSPLUGINHELPERDIR</envar></term>
479
This environment variable will be assumed to contain the
480
directory containing any helper executables. The use and
481
nature of these helper executables, if any, is
482
purposefully not documented.
488
This program does not use any other environment variables, not
489
even the ones provided by <citerefentry><refentrytitle
381
This program does not use any environment variables, not even
382
the ones provided by <citerefentry><refentrytitle
490
383
>cryptsetup</refentrytitle><manvolnum>8</manvolnum>
495
<refsect1 id="network-hooks">
496
<title>NETWORK HOOKS</title>
498
If a network interface like a bridge or tunnel is required to
499
find a Mandos server, this requires the interface to be up and
500
running before <command>&COMMANDNAME;</command> starts looking
501
for Mandos servers. This can be accomplished by creating a
502
<quote>network hook</quote> program, and placing it in a special
506
Before the network is used (and again before program exit), any
507
runnable programs found in the network hook directory are run
508
with the argument <quote><literal>start</literal></quote> or
509
<quote><literal>stop</literal></quote>. This should bring up or
510
down, respectively, any network interface which
511
<command>&COMMANDNAME;</command> should use.
513
<refsect2 id="hook-requirements">
514
<title>REQUIREMENTS</title>
516
A network hook must be an executable file, and its name must
517
consist entirely of upper and lower case letters, digits,
518
underscores, periods, and hyphens.
521
A network hook will receive one argument, which can be one of
526
<term><literal>start</literal></term>
529
This should make the network hook create (if necessary)
530
and bring up a network interface.
535
<term><literal>stop</literal></term>
538
This should make the network hook take down a network
539
interface, and delete it if it did not exist previously.
544
<term><literal>files</literal></term>
547
This should make the network hook print, <emphasis>one
548
file per line</emphasis>, all the files needed for it to
549
run. (These files will be copied into the initial RAM
550
filesystem.) Typical use is for a network hook which is
551
a shell script to print its needed binaries.
554
It is not necessary to print any non-executable files
555
already in the network hook directory, these will be
556
copied implicitly if they otherwise satisfy the name
562
<term><literal>modules</literal></term>
565
This should make the network hook print, <emphasis>on
566
separate lines</emphasis>, all the kernel modules needed
567
for it to run. (These modules will be copied into the
568
initial RAM filesystem.) For instance, a tunnel
570
<quote><literal>tun</literal></quote> module.
576
The network hook will be provided with a number of environment
581
<term><envar>MANDOSNETHOOKDIR</envar></term>
584
The network hook directory, specified to
585
<command>&COMMANDNAME;</command> by the
586
<option>--network-hook-dir</option> option. Note: this
587
should <emphasis>always</emphasis> be used by the
588
network hook to refer to itself or any files in the hook
589
directory it may require.
594
<term><envar>DEVICE</envar></term>
597
The network interfaces, as specified to
598
<command>&COMMANDNAME;</command> by the
599
<option>--interface</option> option, combined to one
600
string and separated by commas. If this is set, and
601
does not contain the interface a hook will bring up,
602
there is no reason for a hook to continue.
607
<term><envar>MODE</envar></term>
610
This will be the same as the first argument;
611
i.e. <quote><literal>start</literal></quote>,
612
<quote><literal>stop</literal></quote>,
613
<quote><literal>files</literal></quote>, or
614
<quote><literal>modules</literal></quote>.
619
<term><envar>VERBOSITY</envar></term>
622
This will be the <quote><literal>1</literal></quote> if
623
the <option>--debug</option> option is passed to
624
<command>&COMMANDNAME;</command>, otherwise
625
<quote><literal>0</literal></quote>.
630
<term><envar>DELAY</envar></term>
633
This will be the same as the <option>--delay</option>
634
option passed to <command>&COMMANDNAME;</command>. Is
635
only set if <envar>MODE</envar> is
636
<quote><literal>start</literal></quote> or
637
<quote><literal>stop</literal></quote>.
642
<term><envar>CONNECT</envar></term>
645
This will be the same as the <option>--connect</option>
646
option passed to <command>&COMMANDNAME;</command>. Is
647
only set if <option>--connect</option> is passed and
648
<envar>MODE</envar> is
649
<quote><literal>start</literal></quote> or
650
<quote><literal>stop</literal></quote>.
656
A hook may not read from standard input, and should be
657
restrictive in printing to standard output or standard error
658
unless <varname>VERBOSITY</varname> is
659
<quote><literal>1</literal></quote>.
664
388
<refsect1 id="files">
665
389
<title>FILES</title>