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<command>&COMMANDNAME;</command>
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<arg choice='opt'>-i<arg choice='plain'>IF</arg></arg>
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<arg choice='opt'>-a<arg choice='plain'>ADDRESS</arg></arg>
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<arg choice='opt'>-p<arg choice='plain'>PORT</arg></arg>
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<arg choice='opt'>--priority<arg choice='plain'>PRIORITY</arg></arg>
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<arg choice='opt'>--servicename<arg choice='plain'>NAME</arg></arg>
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<arg choice='opt'>--configdir<arg choice='plain'>DIRECTORY</arg></arg>
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<arg choice='opt'>--debug</arg>
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<command>&COMMANDNAME;</command>
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86
<arg choice='plain'>--help</arg>
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<refsect1 id="description">
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99
<title>DESCRIPTION</title>
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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 GnuTLS to
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communicate securely with and to authenticate the clients.
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Mandos uses IPv6 link-local addresses, since the clients are
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assumed to not have any other addresses configured yet. Any
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authenticated client is then given the pre-encrypted password
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for that specific client.
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<refsect1 id="purpose">
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<title>PURPOSE</title>
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The purpose of this is to enable <emphasis>remote and unattended
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rebooting</emphasis> of any client host computer with an
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<emphasis>encrypted root file system</emphasis>. The client
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host computer should start a Mandos client in the initial RAM
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disk environment, the Mandos client program communicates with
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this server program to get an encrypted password, which is then
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decrypted and used to unlock the encrypted root file system.
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The client host computer can then continue its boot sequence
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<refsect1 id="options">
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<title>OPTIONS</title>
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<command>&COMMANDNAME;</command> is a server daemon that handels
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incomming passwords request for passwords. Mandos use avahi to
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announce the service, and through gnutls authenticates
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clients. Any authenticated client is then given its encrypted
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110
<term><literal>-h</literal>, <literal>--help</literal></term>
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Show a help message and exit
113
show a help message and exit
169
130
ADDRESS</replaceable></literal></term>
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If this option is used, the server will only listen to a
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specific address. This must currently be an IPv6 address;
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an IPv4 address can be specified using the
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"<literal>::FFFF:192.0.2.3</literal>" syntax. Also, if a
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link-local address is specified, an interface should be
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set, since a link-local address is only valid on a single
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interface. By default, the server will listen to all
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Address to listen for requests on
219
168
PRIORITY</replaceable></literal></term>
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GnuTLS priority string for the TLS handshake with the
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<citerefentry><refentrytitle>gnutls_priority_init
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</refentrytitle><manvolnum>3</manvolnum></citerefentry>
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for the syntax. The default is
227
"<literal>SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP</literal>".
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<emphasis>Warning</emphasis>: changing this may make the
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TLS handshake fail, making communication with clients
171
GnuTLS priority string. See <citerefentry>
172
<refentrytitle>gnutls_priority_init</refentrytitle>
173
<manvolnum>3</manvolnum></citerefentry>
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199
<term><literal>--version</literal></term>
270
Prints the program version and exit.
202
Prints the program version
277
<refsect1 id="protocol">
278
<title>NETWORK PROTOCOL</title>
280
The Mandos server announces itself as a Zeroconf service of type
281
"<literal>_mandos._tcp</literal>". The Mandos client connects
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to the announced address and port, and sends a line of text
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where the first whitespace-separated field is the protocol
284
version, which currently is "<literal>1</literal>". The client
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and server then start a TLS protocol handshake with a slight
286
quirk: the Mandos server program acts as a TLS "client" while
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the connecting Mandos client acts as a TLS "server". The Mandos
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client must supply an OpenPGP certificate, and the fingerprint
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of this certificate is used by the Mandos server to look up (in
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a list read from a file at start time) which binary blob to give
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the client. No other authentication or authorization is done by
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<informaltable><tgroup cols="3"><thead>
296
<entry>Mandos Client</entry>
297
<entry>Direction</entry>
298
<entry>Mandos Server</entry>
302
<entry>Connect</entry>
303
<entry>-><!-- → --></entry>
306
<entry>"<literal>1\r\en</literal>"</entry>
307
<entry>-><!-- → --></entry>
310
<entry>TLS handshake</entry>
311
<entry><-><!-- ⟷ --></entry>
312
<entry>TLS handshake</entry>
315
<entry>OpenPGP public key (part of TLS handshake)</entry>
316
<entry>-><!-- → --></entry>
320
<entry><-<!-- ← --></entry>
321
<entry>Binary blob</entry>
325
<entry><-<!-- ← --></entry>
328
</tbody></tgroup></informaltable>
331
<refsect1 id="logging">
332
<title>LOGGING</title>
334
The server will log a lot of information with various severity
336
<citerefentry><refentrytitle>syslog</refentrytitle>
337
<manvolnum>8</manvolnum></citerefentry>. With the
338
<option>--debug</option> option, it will log even more messages,
339
and also show them on the console.
343
<refsect1 id="exit_status">
344
<title>EXIT STATUS</title>
346
The server will exit with a non-zero exit status only when a
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critical error is encountered.
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<filename>/etc/mandos/mandos.conf</filename> See <citerefentry>
357
<refentrytitle>mandos.conf</refentrytitle>
358
<manvolnum>5</manvolnum></citerefentry>.
361
<filename>/etc/mandos/clients.conf</filename> See <citerefentry>
362
<refentrytitle>mandos-clients.conf</refentrytitle>
363
<manvolnum>5</manvolnum></citerefentry>.
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<filename>/var/run/mandos/mandos.pid</filename>
378
<refsect1 id="examples">
379
<title>EXAMPLES</title>
384
<refsect1 id="security">
385
<title>SECURITY</title>
390
<refsect1 id="see_also">
391
<title>SEE ALSO</title>
392
<itemizedlist spacing="compact">
394
<citerefentry><refentrytitle>password-request</refentrytitle>
395
<manvolnum>8mandos</manvolnum></citerefentry>
399
<citerefentry><refentrytitle>plugin-runner</refentrytitle>
400
<manvolnum>8mandos</manvolnum></citerefentry>
404
<ulink url="http://www.zeroconf.org/">Zeroconf</ulink>
408
<ulink url="http://www.avahi.org/">Avahi</ulink>
413
url="http://www.gnu.org/software/gnutls/">GnuTLS</ulink>
417
<citation>RFC 4880: <citetitle>OpenPGP Message
418
Format</citetitle></citation>
422
<citation>RFC 5081: <citetitle>Using OpenPGP Keys for
423
Transport Layer Security</citetitle></citation>
427
<citation>RFC 4291: <citetitle>IP Version 6 Addressing
428
Architecture</citetitle>, section 2.5.6, Link-Local IPv6
429
Unicast Addresses</citation>