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19
<firstname>Björn</firstname>
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20
<surname>Påhlsson</surname>
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<email>belorn@fukt.bsnet.se</email>
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<email>belorn@recompile.se</email>
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<firstname>Teddy</firstname>
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<surname>Hogeborn</surname>
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<email>teddy@fukt.bsnet.se</email>
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<email>teddy@recompile.se</email>
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44
<holder>Teddy Hogeborn</holder>
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<holder>Björn Påhlsson</holder>
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<replaceable>DIRECTORY</replaceable></option></arg>
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<arg><option>--debug</option></arg>
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<arg><option>--debuglevel
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<replaceable>LEVEL</replaceable></option></arg>
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<arg><option>--no-dbus</option></arg>
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<arg><option>--no-ipv6</option></arg>
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<arg><option>--no-restore</option></arg>
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<arg><option>--statedir
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<replaceable>DIRECTORY</replaceable></option></arg>
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<arg><option>--socket
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<replaceable>FD</replaceable></option></arg>
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<arg><option>--foreground</option></arg>
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<arg><option>--no-zeroconf</option></arg>
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<command>&COMMANDNAME;</command>
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<command>&COMMANDNAME;</command> is a server daemon which
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handles incoming request for passwords for a pre-defined list of
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client host computers. The Mandos server uses Zeroconf to
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announce itself on the local network, and uses TLS to
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communicate securely with and to authenticate the clients. The
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Mandos server uses IPv6 to allow Mandos clients to use IPv6
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link-local addresses, since the clients will probably not have
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any other addresses configured (see <xref linkend="overview"/>).
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Any authenticated client is then given the stored pre-encrypted
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password for that specific client.
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client host computers. For an introduction, see
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<citerefentry><refentrytitle>intro</refentrytitle>
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<manvolnum>8mandos</manvolnum></citerefentry>. The Mandos server
141
uses Zeroconf to announce itself on the local network, and uses
142
TLS to communicate securely with and to authenticate the
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clients. The Mandos server uses IPv6 to allow Mandos clients to
144
use IPv6 link-local addresses, since the clients will probably
145
not have any other addresses configured (see <xref
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linkend="overview"/>). Any authenticated client is then given
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the stored pre-encrypted password for that specific client.
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<term><option>--debuglevel
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<replaceable>LEVEL</replaceable></option></term>
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Set the debugging log level.
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<replaceable>LEVEL</replaceable> is a string, one of
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<quote><literal>CRITICAL</literal></quote>,
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<quote><literal>ERROR</literal></quote>,
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<quote><literal>WARNING</literal></quote>,
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<quote><literal>INFO</literal></quote>, or
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<quote><literal>DEBUG</literal></quote>, in order of
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increasing verbosity. The default level is
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<quote><literal>WARNING</literal></quote>.
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<term><option>--priority <replaceable>
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PRIORITY</replaceable></option></term>
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<term><option>--no-dbus</option></term>
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<xi:include href="mandos-options.xml" xpointer="dbus"/>
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See also <xref linkend="dbus_interface"/>.
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<term><option>--no-ipv6</option></term>
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<xi:include href="mandos-options.xml" xpointer="ipv6"/>
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<term><option>--no-restore</option></term>
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<xi:include href="mandos-options.xml" xpointer="restore"/>
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See also <xref linkend="persistent_state"/>.
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<term><option>--statedir
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<replaceable>DIRECTORY</replaceable></option></term>
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<xi:include href="mandos-options.xml" xpointer="statedir"/>
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<term><option>--socket
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<replaceable>FD</replaceable></option></term>
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<xi:include href="mandos-options.xml" xpointer="socket"/>
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<term><option>--foreground</option></term>
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<xi:include href="mandos-options.xml"
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xpointer="foreground"/>
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<term><option>--no-zeroconf</option></term>
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<xi:include href="mandos-options.xml" xpointer="zeroconf"/>
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The server will, by default, continually check that the clients
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413
are still up. If a client has not been confirmed as being up
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414
for some time, the client is assumed to be compromised and is no
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longer eligible to receive the encrypted password. The timeout,
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checker program, and interval between checks can be configured
311
both globally and per client; see <citerefentry>
415
longer eligible to receive the encrypted password. (Manual
416
intervention is required to re-enable a client.) The timeout,
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extended timeout, checker program, and interval between checks
418
can be configured both globally and per client; see
419
<citerefentry><refentrytitle>mandos-clients.conf</refentrytitle>
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<manvolnum>5</manvolnum></citerefentry>.
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<refsect1 id="approval">
425
<title>APPROVAL</title>
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The server can be configured to require manual approval for a
428
client before it is sent its secret. The delay to wait for such
429
approval and the default action (approve or deny) can be
430
configured both globally and per client; see <citerefentry>
312
431
<refentrytitle>mandos-clients.conf</refentrytitle>
313
<manvolnum>5</manvolnum></citerefentry>.
432
<manvolnum>5</manvolnum></citerefentry>. By default all clients
433
will be approved immediately without delay.
436
This can be used to deny a client its secret if not manually
437
approved within a specified time. It can also be used to make
438
the server delay before giving a client its secret, allowing
439
optional manual denying of this specific client.
317
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<refsect1 id="logging">
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<title>LOGGING</title>
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The server will send log message with various severity levels to
321
<filename>/dev/log</filename>. With the
448
<filename class="devicefile">/dev/log</filename>. With the
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<option>--debug</option> option, it will log even more messages,
323
450
and also show them on the console.
454
<refsect1 id="persistent_state">
455
<title>PERSISTENT STATE</title>
457
Client settings, initially read from
458
<filename>clients.conf</filename>, are persistent across
459
restarts, and run-time changes will override settings in
460
<filename>clients.conf</filename>. However, if a setting is
461
<emphasis>changed</emphasis> (or a client added, or removed) in
462
<filename>clients.conf</filename>, this will take precedence.
466
<refsect1 id="dbus_interface">
467
<title>D-BUS INTERFACE</title>
469
The server will by default provide a D-Bus system bus interface.
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This interface will only be accessible by the root user or a
471
Mandos-specific user, if such a user exists. For documentation
472
of the D-Bus API, see the file <filename>DBUS-API</filename>.
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<refsect1 id="exit_status">
328
477
<title>EXIT STATUS</title>
384
<term><filename>/var/run/mandos.pid</filename></term>
387
The file containing the process id of
388
<command>&COMMANDNAME;</command>.
393
<term><filename>/dev/log</filename></term>
533
<term><filename>/run/mandos.pid</filename></term>
536
The file containing the process id of the
537
<command>&COMMANDNAME;</command> process started last.
538
<emphasis >Note:</emphasis> If the <filename
539
class="directory">/run</filename> directory does not
540
exist, <filename>/var/run/mandos.pid</filename> will be
547
class="directory">/var/lib/mandos</filename></term>
550
Directory where persistent state will be saved. Change
551
this with the <option>--statedir</option> option. See
552
also the <option>--no-restore</option> option.
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<term><filename class="devicefile">/dev/log</filename></term>
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The Unix domain socket to where local syslog messages are
419
583
backtrace. This could be considered a feature.
422
Currently, if a client is declared <quote>invalid</quote> due to
423
having timed out, the server does not record this fact onto
424
permanent storage. This has some security implications, see
425
<xref linkend="clients"/>.
428
There is currently no way of querying the server of the current
429
status of clients, other than analyzing its <systemitem
430
class="service">syslog</systemitem> output.
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586
There is no fine-grained control over logging and debug output.
436
Debug mode is conflated with running in the foreground.
439
The console log messages does not show a time stamp.
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589
This server does not check the expire time of clients’ OpenPGP
592
<xi:include href="bugs.xml"/>
447
595
<refsect1 id="example">
457
605
<informalexample>
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607
Run the server in debug mode, read configuration files from
460
the <filename>~/mandos</filename> directory, and use the
461
Zeroconf service name <quote>Test</quote> to not collide with
462
any other official Mandos server on this host:
608
the <filename class="directory">~/mandos</filename> directory,
609
and use the Zeroconf service name <quote>Test</quote> to not
610
collide with any other official Mandos server on this host:
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662
compromised if they are gone for too long.
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If a client is compromised, its downtime should be duly noted
518
by the server which would therefore declare the client
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invalid. But if the server was ever restarted, it would
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re-read its client list from its configuration file and again
521
regard all clients therein as valid, and hence eligible to
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receive their passwords. Therefore, be careful when
523
restarting servers if it is suspected that a client has, in
524
fact, been compromised by parties who may now be running a
525
fake Mandos client with the keys from the non-encrypted
526
initial <acronym>RAM</acronym> image of the client host. What
527
should be done in that case (if restarting the server program
528
really is necessary) is to stop the server program, edit the
529
configuration file to omit any suspect clients, and restart
533
665
For more details on client-side security, see
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666
<citerefentry><refentrytitle>mandos-client</refentrytitle>
535
667
<manvolnum>8mandos</manvolnum></citerefentry>.
540
672
<refsect1 id="see_also">
541
673
<title>SEE ALSO</title>
544
<refentrytitle>mandos-clients.conf</refentrytitle>
545
<manvolnum>5</manvolnum></citerefentry>, <citerefentry>
546
<refentrytitle>mandos.conf</refentrytitle>
547
<manvolnum>5</manvolnum></citerefentry>, <citerefentry>
548
<refentrytitle>mandos-client</refentrytitle>
549
<manvolnum>8mandos</manvolnum></citerefentry>, <citerefentry>
550
<refentrytitle>sh</refentrytitle><manvolnum>1</manvolnum>
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<citerefentry><refentrytitle>intro</refentrytitle>
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<manvolnum>8mandos</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>mandos-clients.conf</refentrytitle>
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<manvolnum>5</manvolnum></citerefentry>,
679
<citerefentry><refentrytitle>mandos.conf</refentrytitle>
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<manvolnum>5</manvolnum></citerefentry>,
681
<citerefentry><refentrytitle>mandos-client</refentrytitle>
682
<manvolnum>8mandos</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>sh</refentrytitle>
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<manvolnum>1</manvolnum></citerefentry>
added
removed
mandos.xml
