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<firstname>Björn</firstname>
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<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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<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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138
<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
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uses Zeroconf to announce itself on the local network, and uses
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TLS to communicate securely with and to authenticate the
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clients. The Mandos server uses IPv6 to allow Mandos clients to
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use IPv6 link-local addresses, since the clients will probably
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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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start a TLS protocol handshake with a slight quirk: the Mandos
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server program acts as a TLS <quote>client</quote> while the
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connecting Mandos client acts as a TLS <quote>server</quote>.
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The Mandos client must supply an OpenPGP certificate, and the
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fingerprint of this certificate is used by the Mandos server to
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look up (in a list read from <filename>clients.conf</filename>
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at start time) which binary blob to give the client. No other
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authentication or authorization is done by the server.
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The Mandos client must supply a TLS public key, and the key ID
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of this public key is used by the Mandos server to look up (in a
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list read from <filename>clients.conf</filename> at start time)
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which binary blob to give the client. No other authentication
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or authorization is done by the server.
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372
<title>Mandos Protocol (Version 1)</title><tgroup cols="3"><thead>
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The server will, by default, continually check that the clients
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are still up. If a client has not been confirmed as being up
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for some time, the client is assumed to be compromised and is no
309
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>
417
longer eligible to receive the encrypted password. (Manual
418
intervention is required to re-enable a client.) The timeout,
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extended timeout, checker program, and interval between checks
420
can be configured both globally and per client; see
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<citerefentry><refentrytitle>mandos-clients.conf</refentrytitle>
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<manvolnum>5</manvolnum></citerefentry>.
426
<refsect1 id="approval">
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<title>APPROVAL</title>
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The server can be configured to require manual approval for a
430
client before it is sent its secret. The delay to wait for such
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approval and the default action (approve or deny) can be
432
configured both globally and per client; see <citerefentry>
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<refentrytitle>mandos-clients.conf</refentrytitle>
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<manvolnum>5</manvolnum></citerefentry>.
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<manvolnum>5</manvolnum></citerefentry>. By default all clients
435
will be approved immediately without delay.
438
This can be used to deny a client its secret if not manually
439
approved within a specified time. It can also be used to make
440
the server delay before giving a client its secret, allowing
441
optional manual denying of this specific client.
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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
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<filename>/dev/log</filename>. With the
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<filename class="devicefile">/dev/log</filename>. With the
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<option>--debug</option> option, it will log even more messages,
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and also show them on the console.
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<refsect1 id="persistent_state">
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<title>PERSISTENT STATE</title>
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Client settings, initially read from
460
<filename>clients.conf</filename>, are persistent across
461
restarts, and run-time changes will override settings in
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<filename>clients.conf</filename>. However, if a setting is
463
<emphasis>changed</emphasis> (or a client added, or removed) in
464
<filename>clients.conf</filename>, this will take precedence.
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<refsect1 id="dbus_interface">
469
<title>D-BUS INTERFACE</title>
471
The server will by default provide a D-Bus system bus interface.
472
This interface will only be accessible by the root user or a
473
Mandos-specific user, if such a user exists. For documentation
474
of the D-Bus API, see the file <filename>DBUS-API</filename>.
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<refsect1 id="exit_status">
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<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>
535
<term><filename>/run/mandos.pid</filename></term>
538
The file containing the process id of the
539
<command>&COMMANDNAME;</command> process started last.
540
<emphasis >Note:</emphasis> If the <filename
541
class="directory">/run</filename> directory does not
542
exist, <filename>/var/run/mandos.pid</filename> will be
549
class="directory">/var/lib/mandos</filename></term>
552
Directory where persistent state will be saved. Change
553
this with the <option>--statedir</option> option. See
554
also the <option>--no-restore</option> option.
559
<term><filename class="devicefile">/dev/log</filename></term>
396
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The Unix domain socket to where local syslog messages are
419
585
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.
433
588
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.
442
This server does not check the expire time of clients’ OpenPGP
590
<xi:include href="bugs.xml"/>
447
593
<refsect1 id="example">
457
603
<informalexample>
459
605
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:
606
the <filename class="directory">~/mandos</filename> directory,
607
and use the Zeroconf service name <quote>Test</quote> to not
608
collide with any other official Mandos server on this host:
497
643
<title>CLIENTS</title>
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645
The server only gives out its stored data to clients which
500
does have the OpenPGP key of the stored fingerprint. This is
501
guaranteed by the fact that the client sends its OpenPGP
502
public key in the TLS handshake; this ensures it to be
503
genuine. The server computes the fingerprint of the key
504
itself and looks up the fingerprint in its list of
505
clients. The <filename>clients.conf</filename> file (see
646
does have the correct key ID of the stored key ID. This is
647
guaranteed by the fact that the client sends its public key in
648
the TLS handshake; this ensures it to be genuine. The server
649
computes the key ID of the key itself and looks up the key ID
650
in its list of clients. The <filename>clients.conf</filename>
506
652
<citerefentry><refentrytitle>mandos-clients.conf</refentrytitle>
507
653
<manvolnum>5</manvolnum></citerefentry>)
508
654
<emphasis>must</emphasis> be made non-readable by anyone
514
660
compromised if they are gone for too long.
517
If a client is compromised, its downtime should be duly noted
518
by the server which would therefore declare the client
519
invalid. But if the server was ever restarted, it would
520
re-read its client list from its configuration file and again
521
regard all clients therein as valid, and hence eligible to
522
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
663
For more details on client-side security, see
534
664
<citerefentry><refentrytitle>mandos-client</refentrytitle>
535
665
<manvolnum>8mandos</manvolnum></citerefentry>.
540
670
<refsect1 id="see_also">
541
671
<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>
673
<citerefentry><refentrytitle>intro</refentrytitle>
674
<manvolnum>8mandos</manvolnum></citerefentry>,
675
<citerefentry><refentrytitle>mandos-clients.conf</refentrytitle>
676
<manvolnum>5</manvolnum></citerefentry>,
677
<citerefentry><refentrytitle>mandos.conf</refentrytitle>
678
<manvolnum>5</manvolnum></citerefentry>,
679
<citerefentry><refentrytitle>mandos-client</refentrytitle>
680
<manvolnum>8mandos</manvolnum></citerefentry>,
681
<citerefentry><refentrytitle>sh</refentrytitle>
682
<manvolnum>1</manvolnum></citerefentry>
644
RFC 5081: <citetitle>Using OpenPGP Keys for Transport Layer
649
This is implemented by GnuTLS and used by this server so
650
that OpenPGP keys can be used.
774
RFC 7250: <citetitle>Using Raw Public Keys in Transport
775
Layer Security (TLS) and Datagram Transport Layer Security
780
This is implemented by GnuTLS version 3.6.6 and is, if
781
present, used by this server so that raw public keys can be
788
RFC 6091: <citetitle>Using OpenPGP Keys for Transport Layer
789
Security (TLS) Authentication</citetitle>
793
This is implemented by GnuTLS before version 3.6.0 and is,
794
if present, used by this server so that OpenPGP keys can be