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<command>&COMMANDNAME;</command> is a client program that
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146
communicates with <citerefentry><refentrytitle
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147
>mandos</refentrytitle><manvolnum>8</manvolnum></citerefentry>
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to get a password. It uses IPv6 link-local addresses to get
125
network connectivity, Zeroconf to find servers, and TLS with an
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OpenPGP key to ensure authenticity and confidentiality. It
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keeps running, trying all servers on the network, until it
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receives a satisfactory reply or a TERM signal is received.
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to get a password. In slightly more detail, this client program
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brings up network interfaces, uses the interfaces’ IPv6
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link-local addresses to get network connectivity, uses Zeroconf
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to find servers on the local network, and communicates with
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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
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or a TERM signal. After all servers have been tried, all
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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
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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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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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This option is normally only useful for testing and
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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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<term><option>--interface=
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<replaceable>NAME</replaceable></option></term>
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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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<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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Network interface that will be brought up and scanned for
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Mandos servers to connect to. The default it
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<quote><literal>eth0</literal></quote>.
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If the <option>--connect</option> option is used, this
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specifies the interface to use to connect to the address
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Comma separated list of network interfaces that will be
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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
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<quote>network hook</quote> — see <xref
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linkend="network-hooks"/>.
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<replaceable>NAME</replaceable> can be the string
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<quote><literal>none</literal></quote>; this will make
269
<command>&COMMANDNAME;</command> only bring up interfaces
270
specified <emphasis>before</emphasis> this string. This
271
is not recommended, and only meant for advanced users.
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Sets the number of bits to use for the prime number in the
249
TLS Diffie-Hellman key exchange. Default is 1024.
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TLS Diffie-Hellman key exchange. The default value is
320
selected automatically based on the OpenPGP key. Note
321
that if the <option>--dh-params</option> option is used,
322
the values from that file will be used instead.
328
<term><option>--dh-params=<replaceable
329
>FILE</replaceable></option></term>
332
Specifies a PEM-encoded PKCS#3 file to read the parameters
333
needed by the TLS Diffie-Hellman key exchange from. If
334
this option is not given, or if the file for some reason
335
could not be used, the parameters will be generated on
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startup, which will take some time and processing power.
337
Those using servers running under time, power or processor
338
constraints may want to generate such a file in advance
345
<term><option>--delay=<replaceable
346
>SECONDS</replaceable></option></term>
349
After bringing a network interface up, the program waits
350
for the interface to arrive in a <quote>running</quote>
351
state before proceeding. During this time, the kernel log
352
level will be lowered to reduce clutter on the system
353
console, alleviating any other plugins which might be
354
using the system console. This option sets the upper
355
limit of seconds to wait. The default is 2.5 seconds.
361
<term><option>--retry=<replaceable
362
>SECONDS</replaceable></option></term>
365
All Mandos servers are tried repeatedly until a password
366
is received. This value specifies, in seconds, how long
367
between each successive try <emphasis>for the same
368
server</emphasis>. The default is 10 seconds.
374
<term><option>--network-hook-dir=<replaceable
375
>DIR</replaceable></option></term>
378
Network hook directory. The default directory is
379
<quote><filename class="directory"
380
>/lib/mandos/network-hooks.d</filename></quote>.
328
461
server could be found and the password received from it could be
329
462
successfully decrypted and output on standard output. The
330
463
program will exit with a non-zero exit status only if a critical
331
error occurs. Otherwise, it will forever connect to new
332
<application>Mandos</application> servers as they appear, trying
333
to get a decryptable password and print it.
464
error occurs. Otherwise, it will forever connect to any
465
discovered <application>Mandos</application> servers, trying to
466
get a decryptable password and print it.
337
470
<refsect1 id="environment">
338
471
<title>ENVIRONMENT</title>
474
<term><envar>MANDOSPLUGINHELPERDIR</envar></term>
477
This environment variable will be assumed to contain the
478
directory containing any helper executables. The use and
479
nature of these helper executables, if any, is
480
purposefully not documented.
340
This program does not use any environment variables, not even
341
the ones provided by <citerefentry><refentrytitle
486
This program does not use any other environment variables, not
487
even the ones provided by <citerefentry><refentrytitle
342
488
>cryptsetup</refentrytitle><manvolnum>8</manvolnum>
493
<refsect1 id="network-hooks">
494
<title>NETWORK HOOKS</title>
496
If a network interface like a bridge or tunnel is required to
497
find a Mandos server, this requires the interface to be up and
498
running before <command>&COMMANDNAME;</command> starts looking
499
for Mandos servers. This can be accomplished by creating a
500
<quote>network hook</quote> program, and placing it in a special
504
Before the network is used (and again before program exit), any
505
runnable programs found in the network hook directory are run
506
with the argument <quote><literal>start</literal></quote> or
507
<quote><literal>stop</literal></quote>. This should bring up or
508
down, respectively, any network interface which
509
<command>&COMMANDNAME;</command> should use.
511
<refsect2 id="hook-requirements">
512
<title>REQUIREMENTS</title>
514
A network hook must be an executable file, and its name must
515
consist entirely of upper and lower case letters, digits,
516
underscores, periods, and hyphens.
519
A network hook will receive one argument, which can be one of
524
<term><literal>start</literal></term>
527
This should make the network hook create (if necessary)
528
and bring up a network interface.
533
<term><literal>stop</literal></term>
536
This should make the network hook take down a network
537
interface, and delete it if it did not exist previously.
542
<term><literal>files</literal></term>
545
This should make the network hook print, <emphasis>one
546
file per line</emphasis>, all the files needed for it to
547
run. (These files will be copied into the initial RAM
548
filesystem.) Typical use is for a network hook which is
549
a shell script to print its needed binaries.
552
It is not necessary to print any non-executable files
553
already in the network hook directory, these will be
554
copied implicitly if they otherwise satisfy the name
560
<term><literal>modules</literal></term>
563
This should make the network hook print, <emphasis>on
564
separate lines</emphasis>, all the kernel modules needed
565
for it to run. (These modules will be copied into the
566
initial RAM filesystem.) For instance, a tunnel
568
<quote><literal>tun</literal></quote> module.
574
The network hook will be provided with a number of environment
579
<term><envar>MANDOSNETHOOKDIR</envar></term>
582
The network hook directory, specified to
583
<command>&COMMANDNAME;</command> by the
584
<option>--network-hook-dir</option> option. Note: this
585
should <emphasis>always</emphasis> be used by the
586
network hook to refer to itself or any files in the hook
587
directory it may require.
592
<term><envar>DEVICE</envar></term>
595
The network interfaces, as specified to
596
<command>&COMMANDNAME;</command> by the
597
<option>--interface</option> option, combined to one
598
string and separated by commas. If this is set, and
599
does not contain the interface a hook will bring up,
600
there is no reason for a hook to continue.
605
<term><envar>MODE</envar></term>
608
This will be the same as the first argument;
609
i.e. <quote><literal>start</literal></quote>,
610
<quote><literal>stop</literal></quote>,
611
<quote><literal>files</literal></quote>, or
612
<quote><literal>modules</literal></quote>.
617
<term><envar>VERBOSITY</envar></term>
620
This will be the <quote><literal>1</literal></quote> if
621
the <option>--debug</option> option is passed to
622
<command>&COMMANDNAME;</command>, otherwise
623
<quote><literal>0</literal></quote>.
628
<term><envar>DELAY</envar></term>
631
This will be the same as the <option>--delay</option>
632
option passed to <command>&COMMANDNAME;</command>. Is
633
only set if <envar>MODE</envar> is
634
<quote><literal>start</literal></quote> or
635
<quote><literal>stop</literal></quote>.
640
<term><envar>CONNECT</envar></term>
643
This will be the same as the <option>--connect</option>
644
option passed to <command>&COMMANDNAME;</command>. Is
645
only set if <option>--connect</option> is passed and
646
<envar>MODE</envar> is
647
<quote><literal>start</literal></quote> or
648
<quote><literal>stop</literal></quote>.
654
A hook may not read from standard input, and should be
655
restrictive in printing to standard output or standard error
656
unless <varname>VERBOSITY</varname> is
657
<quote><literal>1</literal></quote>.
347
662
<refsect1 id="files">
348
663
<title>FILES</title>