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122
<command>&COMMANDNAME;</command> is a client program that
149
123
communicates with <citerefentry><refentrytitle
150
124
>mandos</refentrytitle><manvolnum>8</manvolnum></citerefentry>
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to get a password. In slightly more detail, this client program
152
brings up network interfaces, uses the interfaces’ IPv6
153
link-local addresses to get network connectivity, uses Zeroconf
154
to find servers on the local network, and communicates with
155
servers using TLS with an OpenPGP key to ensure authenticity and
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confidentiality. This client program keeps running, trying all
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servers on the network, until it receives a satisfactory reply
158
or a TERM signal. After all servers have been tried, all
159
servers are periodically retried. If no servers are found it
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will wait indefinitely for new servers to appear.
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The network interfaces are selected like this: If any interfaces
164
are specified using the <option>--interface</option> option,
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those interface are used. Otherwise,
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<command>&COMMANDNAME;</command> will use all interfaces that
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are not loopback interfaces, are not point-to-point interfaces,
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are capable of broadcasting and do not have the NOARP flag (see
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<citerefentry><refentrytitle>netdevice</refentrytitle>
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<manvolnum>7</manvolnum></citerefentry>). (If the
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<option>--connect</option> option is used, point-to-point
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interfaces and non-broadcast interfaces are accepted.) If any
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used interfaces are not up and running, they are first taken up
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(and later taken down again on program exit).
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Before network interfaces are selected, all <quote>network
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hooks</quote> are run; see <xref linkend="network-hooks"/>.
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to get a password. It brings up a network interface, uses its
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IPv6 link-local address to get network connectivity, uses
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Zeroconf to find servers, and uses TLS with an OpenPGP key to
128
ensure authenticity and confidentiality. It keeps running,
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trying all servers on the network, until it receives a
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satisfactory reply or a TERM signal is received.
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133
This program is not meant to be run directly; it is really meant
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assumed to separate the address from the port number.
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Normally, Zeroconf would be used to locate Mandos servers,
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in which case this option would only be used when testing
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This option is normally only useful for testing and
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<term><option>--interface=<replaceable
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>NAME</replaceable><arg rep='repeat'>,<replaceable
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>NAME</replaceable></arg></option></term>
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<term><option>--interface=
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<replaceable>NAME</replaceable></option></term>
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<replaceable>NAME</replaceable><arg rep='repeat'>,<replaceable
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>NAME</replaceable></arg></option></term>
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<replaceable>NAME</replaceable></option></term>
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Comma separated list of network interfaces that will be
248
brought up and scanned for Mandos servers to connect to.
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The default is the empty string, which will automatically
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use all appropriate interfaces.
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If the <option>--connect</option> option is used, and
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exactly one interface name is specified (except
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<quote><literal>none</literal></quote>), this specifies
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the interface to use to connect to the address given.
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Note that since this program will normally run in the
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initial RAM disk environment, the interface must be an
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interface which exists at that stage. Thus, the interface
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can normally not be a pseudo-interface such as
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<quote>br0</quote> or <quote>tun0</quote>; such interfaces
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will not exist until much later in the boot process, and
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can not be used by this program, unless created by a
266
<quote>network hook</quote> — see <xref
267
linkend="network-hooks"/>.
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<replaceable>NAME</replaceable> can be the string
271
<quote><literal>none</literal></quote>; this will make
272
<command>&COMMANDNAME;</command> only bring up interfaces
273
specified <emphasis>before</emphasis> this string. This
274
is not recommended, and only meant for advanced users.
196
Network interface that will be brought up and scanned for
197
Mandos servers to connect to. The default it
198
<quote><literal>eth0</literal></quote>.
201
If the <option>--connect</option> option is used, this
202
specifies the interface to use to connect to the address
321
250
Sets the number of bits to use for the prime number in the
322
TLS Diffie-Hellman key exchange. The default value is
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.
331
<term><option>--dh-params=<replaceable
332
>FILE</replaceable></option></term>
335
Specifies a PEM-encoded PKCS#3 file to read the parameters
336
needed by the TLS Diffie-Hellman key exchange from. If
337
this option is not given, or if the file for some reason
338
could not be used, the parameters will be generated on
339
startup, which will take some time and processing power.
340
Those using servers running under time, power or processor
341
constraints may want to generate such a file in advance
348
<term><option>--delay=<replaceable
349
>SECONDS</replaceable></option></term>
352
After bringing a network interface up, the program waits
353
for the interface to arrive in a <quote>running</quote>
354
state before proceeding. During this time, the kernel log
355
level will be lowered to reduce clutter on the system
356
console, alleviating any other plugins which might be
357
using the system console. This option sets the upper
358
limit of seconds to wait. The default is 2.5 seconds.
364
<term><option>--retry=<replaceable
365
>SECONDS</replaceable></option></term>
368
All Mandos servers are tried repeatedly until a password
369
is received. This value specifies, in seconds, how long
370
between each successive try <emphasis>for the same
371
server</emphasis>. The default is 10 seconds.
377
<term><option>--network-hook-dir=<replaceable
378
>DIR</replaceable></option></term>
381
Network hook directory. The default directory is
382
<quote><filename class="directory"
383
>/lib/mandos/network-hooks.d</filename></quote>.
251
TLS Diffie-Hellman key exchange. Default is 1024.
464
330
server could be found and the password received from it could be
465
331
successfully decrypted and output on standard output. The
466
332
program will exit with a non-zero exit status only if a critical
467
error occurs. Otherwise, it will forever connect to any
468
discovered <application>Mandos</application> servers, trying to
469
get a decryptable password and print it.
333
error occurs. Otherwise, it will forever connect to new
334
<application>Mandos</application> servers as they appear, trying
335
to get a decryptable password and print it.
473
339
<refsect1 id="environment">
474
340
<title>ENVIRONMENT</title>
477
<term><envar>MANDOSPLUGINHELPERDIR</envar></term>
480
This environment variable will be assumed to contain the
481
directory containing any helper executables. The use and
482
nature of these helper executables, if any, is
483
purposefully not documented.
489
This program does not use any other environment variables, not
490
even the ones provided by <citerefentry><refentrytitle
342
This program does not use any environment variables, not even
343
the ones provided by <citerefentry><refentrytitle
491
344
>cryptsetup</refentrytitle><manvolnum>8</manvolnum>
496
<refsect1 id="network-hooks">
497
<title>NETWORK HOOKS</title>
499
If a network interface like a bridge or tunnel is required to
500
find a Mandos server, this requires the interface to be up and
501
running before <command>&COMMANDNAME;</command> starts looking
502
for Mandos servers. This can be accomplished by creating a
503
<quote>network hook</quote> program, and placing it in a special
507
Before the network is used (and again before program exit), any
508
runnable programs found in the network hook directory are run
509
with the argument <quote><literal>start</literal></quote> or
510
<quote><literal>stop</literal></quote>. This should bring up or
511
down, respectively, any network interface which
512
<command>&COMMANDNAME;</command> should use.
514
<refsect2 id="hook-requirements">
515
<title>REQUIREMENTS</title>
517
A network hook must be an executable file, and its name must
518
consist entirely of upper and lower case letters, digits,
519
underscores, periods, and hyphens.
522
A network hook will receive one argument, which can be one of
527
<term><literal>start</literal></term>
530
This should make the network hook create (if necessary)
531
and bring up a network interface.
536
<term><literal>stop</literal></term>
539
This should make the network hook take down a network
540
interface, and delete it if it did not exist previously.
545
<term><literal>files</literal></term>
548
This should make the network hook print, <emphasis>one
549
file per line</emphasis>, all the files needed for it to
550
run. (These files will be copied into the initial RAM
551
filesystem.) Typical use is for a network hook which is
552
a shell script to print its needed binaries.
555
It is not necessary to print any non-executable files
556
already in the network hook directory, these will be
557
copied implicitly if they otherwise satisfy the name
563
<term><literal>modules</literal></term>
566
This should make the network hook print, <emphasis>on
567
separate lines</emphasis>, all the kernel modules needed
568
for it to run. (These modules will be copied into the
569
initial RAM filesystem.) For instance, a tunnel
571
<quote><literal>tun</literal></quote> module.
577
The network hook will be provided with a number of environment
582
<term><envar>MANDOSNETHOOKDIR</envar></term>
585
The network hook directory, specified to
586
<command>&COMMANDNAME;</command> by the
587
<option>--network-hook-dir</option> option. Note: this
588
should <emphasis>always</emphasis> be used by the
589
network hook to refer to itself or any files in the hook
590
directory it may require.
595
<term><envar>DEVICE</envar></term>
598
The network interfaces, as specified to
599
<command>&COMMANDNAME;</command> by the
600
<option>--interface</option> option, combined to one
601
string and separated by commas. If this is set, and
602
does not contain the interface a hook will bring up,
603
there is no reason for a hook to continue.
608
<term><envar>MODE</envar></term>
611
This will be the same as the first argument;
612
i.e. <quote><literal>start</literal></quote>,
613
<quote><literal>stop</literal></quote>,
614
<quote><literal>files</literal></quote>, or
615
<quote><literal>modules</literal></quote>.
620
<term><envar>VERBOSITY</envar></term>
623
This will be the <quote><literal>1</literal></quote> if
624
the <option>--debug</option> option is passed to
625
<command>&COMMANDNAME;</command>, otherwise
626
<quote><literal>0</literal></quote>.
631
<term><envar>DELAY</envar></term>
634
This will be the same as the <option>--delay</option>
635
option passed to <command>&COMMANDNAME;</command>. Is
636
only set if <envar>MODE</envar> is
637
<quote><literal>start</literal></quote> or
638
<quote><literal>stop</literal></quote>.
643
<term><envar>CONNECT</envar></term>
646
This will be the same as the <option>--connect</option>
647
option passed to <command>&COMMANDNAME;</command>. Is
648
only set if <option>--connect</option> is passed and
649
<envar>MODE</envar> is
650
<quote><literal>start</literal></quote> or
651
<quote><literal>stop</literal></quote>.
657
A hook may not read from standard input, and should be
658
restrictive in printing to standard output or standard error
659
unless <varname>VERBOSITY</varname> is
660
<quote><literal>1</literal></quote>.
665
349
<refsect1 id="files">
666
350
<title>FILES</title>