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<command>&COMMANDNAME;</command> is a client program that
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communicates with <citerefentry><refentrytitle
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>mandos</refentrytitle><manvolnum>8</manvolnum></citerefentry>
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to get a password. It uses IPv6 link-local addresses to get
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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
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<command>&COMMANDNAME;</command> only bring up interfaces
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specified <emphasis>before</emphasis> this string. This
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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
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TLS Diffie-Hellman key exchange. Default is 1024.
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TLS Diffie-Hellman key exchange. The default value is
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selected automatically based on the OpenPGP key. Note
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that if the <option>--dh-params</option> option is used,
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the values from that file will be used instead.
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<term><option>--dh-params=<replaceable
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>FILE</replaceable></option></term>
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Specifies a PEM-encoded PKCS#3 file to read the parameters
338
needed by the TLS Diffie-Hellman key exchange from. If
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this option is not given, or if the file for some reason
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could not be used, the parameters will be generated on
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startup, which will take some time and processing power.
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Those using servers running under time, power or processor
343
constraints may want to generate such a file in advance
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<term><option>--delay=<replaceable
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>SECONDS</replaceable></option></term>
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After bringing a network interface up, the program waits
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for the interface to arrive in a <quote>running</quote>
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state before proceeding. During this time, the kernel log
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level will be lowered to reduce clutter on the system
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console, alleviating any other plugins which might be
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using the system console. This option sets the upper
360
limit of seconds to wait. The default is 2.5 seconds.
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<term><option>--retry=<replaceable
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>SECONDS</replaceable></option></term>
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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>.
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server could be found and the password received from it could be
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successfully decrypted and output on standard output. The
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468
program will exit with a non-zero exit status only if a critical
332
error occurs. Otherwise, it will forever connect to new
333
<application>Mandos</application> servers as they appear, trying
334
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.
338
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<refsect1 id="environment">
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<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.
341
This program does not use any environment variables, not even
342
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
343
493
>cryptsetup</refentrytitle><manvolnum>8</manvolnum>
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<refsect1 id="network-hooks">
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<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>.
348
667
<refsect1 id="files">
349
668
<title>FILES</title>