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<?xml version='1.0' encoding='UTF-8'?>
<?xml-stylesheet type="text/xsl"
href="http://docbook.sourceforge.net/release/xsl/current/manpages/docbook.xsl"?>
<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
"http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
<!ENTITY VERSION "1.0">
<!ENTITY COMMANDNAME "mandos">
]>
<refentry>
<refentryinfo>
<title>&COMMANDNAME;</title>
<!-- NWalsh's docbook scripts use this to generate the footer: -->
<productname>&COMMANDNAME;</productname>
<productnumber>&VERSION;</productnumber>
<authorgroup>
<author>
<firstname>Björn</firstname>
<surname>Påhlsson</surname>
<address>
<email>belorn@fukt.bsnet.se</email>
</address>
</author>
<author>
<firstname>Teddy</firstname>
<surname>Hogeborn</surname>
<address>
<email>teddy@fukt.bsnet.se</email>
</address>
</author>
</authorgroup>
<copyright>
<year>2008</year>
<holder>Teddy Hogeborn</holder>
<holder>Björn Påhlsson</holder>
</copyright>
<legalnotice>
<para>
This manual page is free software: you can redistribute it
and/or modify it under the terms of the GNU General Public
License as published by the Free Software Foundation,
either version 3 of the License, or (at your option) any
later version.
</para>
<para>
This manual page is distributed in the hope that it will
be useful, but WITHOUT ANY WARRANTY; without even the
implied warranty of MERCHANTABILITY or FITNESS FOR A
PARTICULAR PURPOSE. See the GNU General Public License
for more details.
</para>
<para>
You should have received a copy of the GNU General Public
License along with this program; If not, see
<ulink url="http://www.gnu.org/licenses/"/>.
</para>
</legalnotice>
</refentryinfo>
<refmeta>
<refentrytitle>&COMMANDNAME;</refentrytitle>
<manvolnum>8</manvolnum>
</refmeta>
<refnamediv>
<refname><command>&COMMANDNAME;</command></refname>
<refpurpose>
Sends encrypted passwords to authenticated Mandos clients
</refpurpose>
</refnamediv>
<refsynopsisdiv>
<cmdsynopsis>
<command>&COMMANDNAME;</command>
<arg choice='opt'>--interface<arg choice='plain'>IF</arg></arg>
<arg choice='opt'>--address<arg choice='plain'>ADDRESS</arg></arg>
<arg choice='opt'>--port<arg choice='plain'>PORT</arg></arg>
<arg choice='opt'>--priority<arg choice='plain'>PRIORITY</arg></arg>
<arg choice='opt'>--servicename<arg choice='plain'>NAME</arg></arg>
<arg choice='opt'>--configdir<arg choice='plain'>DIRECTORY</arg></arg>
<arg choice='opt'>--debug</arg>
</cmdsynopsis>
<cmdsynopsis>
<command>&COMMANDNAME;</command>
<arg choice='opt'>-i<arg choice='plain'>IF</arg></arg>
<arg choice='opt'>-a<arg choice='plain'>ADDRESS</arg></arg>
<arg choice='opt'>-p<arg choice='plain'>PORT</arg></arg>
<arg choice='opt'>--priority<arg choice='plain'>PRIORITY</arg></arg>
<arg choice='opt'>--servicename<arg choice='plain'>NAME</arg></arg>
<arg choice='opt'>--configdir<arg choice='plain'>DIRECTORY</arg></arg>
<arg choice='opt'>--debug</arg>
</cmdsynopsis>
<cmdsynopsis>
<command>&COMMANDNAME;</command>
<arg choice='plain'>--help</arg>
</cmdsynopsis>
<cmdsynopsis>
<command>&COMMANDNAME;</command>
<arg choice='plain'>--version</arg>
</cmdsynopsis>
<cmdsynopsis>
<command>&COMMANDNAME;</command>
<arg choice='plain'>--check</arg>
</cmdsynopsis>
</refsynopsisdiv>
<refsect1 id="description">
<title>DESCRIPTION</title>
<para>
<command>&COMMANDNAME;</command> is a server daemon which
handles incoming request for passwords for a pre-defined list of
client host computers. The Mandos server uses Zeroconf to
announce itself on the local network, and uses GnuTLS to
communicate securely with and to authenticate the clients.
Mandos uses IPv6 link-local addresses, since the clients are
assumed to not have any other addresses configured yet. Any
authenticated client is then given the pre-encrypted password
for that specific client.
</para>
</refsect1>
<refsect1 id="purpose">
<title>PURPOSE</title>
<para>
The purpose of this is to enable <emphasis>remote and unattended
rebooting</emphasis> of any client host computer with an
<emphasis>encrypted root file system</emphasis>. The client
host computer should start a Mandos client in the initial RAM
disk environment, the Mandos client program communicates with
this server program to get an encrypted password, which is then
decrypted and used to unlock the encrypted root file system.
The client host computer can then continue its boot sequence
normally.
</para>
</refsect1>
<refsect1 id="options">
<title>OPTIONS</title>
<variablelist>
<varlistentry>
<term><literal>-h</literal>, <literal>--help</literal></term>
<listitem>
<para>
Show a help message and exit
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><literal>-i</literal>, <literal>--interface <replaceable>
IF</replaceable></literal></term>
<listitem>
<para>
Only announce the server and listen to requests on network
interface <replaceable>IF</replaceable>. Default is to
use all available interfaces.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><literal>-a</literal>, <literal>--address <replaceable>
ADDRESS</replaceable></literal></term>
<listitem>
<para>
If this option is used, the server will only listen to a
specific address. This must currently be an IPv6 address;
an IPv4 address can be specified using the
"<literal>::FFFF:192.0.2.3</literal>" syntax. Also, if a
link-local address is specified, an interface should be
set, since a link-local address is only valid on a single
interface. By default, the server will listen to all
available addresses.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><literal>-p</literal>, <literal>--port <replaceable>
PORT</replaceable></literal></term>
<listitem>
<para>
If this option is used, the server to bind to that
port. By default, the server will listen to an arbitrary
port given by the operating system.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><literal>--check</literal></term>
<listitem>
<para>
Run the server's self-tests. This includes any unit
tests, etc.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><literal>--debug</literal></term>
<listitem>
<para>
If the server is run in debug mode, it will run in the
foreground and print a lot of debugging information. The
default is <emphasis>not</emphasis> to run in debug mode.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><literal>--priority <replaceable>
PRIORITY</replaceable></literal></term>
<listitem>
<para>
GnuTLS priority string for the TLS handshake with the
clients. See
<citerefentry><refentrytitle>gnutls_priority_init
</refentrytitle><manvolnum>3</manvolnum></citerefentry>
for the syntax. The default is
"<literal>SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP</literal>".
<emphasis>Warning</emphasis>: changing this may make the
TLS handshake fail, making communication with clients
impossible.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><literal>--servicename <replaceable>NAME</replaceable>
</literal></term>
<listitem>
<para>
Zeroconf service name. The default is
"<literal>Mandos</literal>". You only need to change this
if you for some reason want to run more than one server on
the same <emphasis>host</emphasis>. If there are name
collisions on the same <emphasis>network</emphasis>, the
new server will automatically rename itself to "Mandos
#2", etc.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><literal>--configdir <replaceable>DIR</replaceable>
</literal></term>
<listitem>
<para>
Directory to search for configuration files. Default is
"<literal>/etc/mandos</literal>". See <citerefentry>
<refentrytitle>mandos.conf</refentrytitle>
<manvolnum>5</manvolnum></citerefentry> and <citerefentry>
<refentrytitle>mandos-clients.conf</refentrytitle>
<manvolnum>5</manvolnum></citerefentry>.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><literal>--version</literal></term>
<listitem>
<para>
Prints the program version and exit.
</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1 id="protocol">
<title>NETWORK PROTOCOL</title>
<para>
The Mandos server announces itself as a Zeroconf service of type
"<literal>_mandos._tcp</literal>". The Mandos client connects
to the announced address and port, and sends a line of text
where the first whitespace-separated field is the protocol
version, which currently is "<literal>1</literal>". The client
and server then start a TLS protocol handshake with a slight
quirk: the Mandos server program acts as a TLS "client" while
the connecting Mandos client acts as a TLS "server". The Mandos
client must supply an OpenPGP certificate, and the fingerprint
of this certificate is used by the Mandos server to look up (in
a list read from a file at start time) which binary blob to give
the client. No other authentication or authorization is done by
the server.
</para>
<informaltable><tgroup cols="3"><thead>
<row>
<entry>Mandos Client</entry>
<entry>Direction</entry>
<entry>Mandos Server</entry>
</row>
</thead><tbody>
<row>
<entry>Connect</entry>
<entry>-><!-- → --></entry>
</row>
<row>
<entry>"<literal>1\r\en</literal>"</entry>
<entry>-><!-- → --></entry>
</row>
<row>
<entry>TLS handshake</entry>
<entry><-><!-- ⟷ --></entry>
<entry>TLS handshake</entry>
</row>
<row>
<entry>OpenPGP public key (part of TLS handshake)</entry>
<entry>-><!-- → --></entry>
</row>
<row>
<entry/>
<entry><-<!-- ← --></entry>
<entry>Binary blob</entry>
</row>
<row>
<entry/>
<entry><-<!-- ← --></entry>
<entry>Close</entry>
</row>
</tbody></tgroup></informaltable>
</refsect1>
<refsect1 id="logging">
<title>LOGGING</title>
<para>
The server will log a lot of information with various severity
levels to
<citerefentry><refentrytitle>syslog</refentrytitle>
<manvolnum>8</manvolnum></citerefentry>. With the
<option>--debug</option> option, it will log even more messages,
and also show them on the console.
</para>
</refsect1>
<refsect1 id="exit_status">
<title>EXIT STATUS</title>
<para>
The server will exit with a non-zero exit status only when a
critical error is encountered.
</para>
</refsect1>
<refsect1 id="file">
<title>FILES</title>
<para>
<itemizedlist>
<listitem><para>
<filename>/etc/mandos/mandos.conf</filename> See <citerefentry>
<refentrytitle>mandos.conf</refentrytitle>
<manvolnum>5</manvolnum></citerefentry>.
</para></listitem>
<listitem><para>
<filename>/etc/mandos/clients.conf</filename> See <citerefentry>
<refentrytitle>mandos-clients.conf</refentrytitle>
<manvolnum>5</manvolnum></citerefentry>.
</para></listitem>
<listitem><para>
<filename>/var/run/mandos/mandos.pid</filename>
</para></listitem>
</itemizedlist>
</para>
</refsect1>
<refsect1 id="bugs">
<title>BUGS</title>
<para>
</para>
</refsect1>
<refsect1 id="examples">
<title>EXAMPLES</title>
<para>
</para>
</refsect1>
<refsect1 id="security">
<title>SECURITY</title>
<para>
</para>
</refsect1>
<refsect1 id="see_also">
<title>SEE ALSO</title>
<itemizedlist spacing="compact">
<listitem><para>
<citerefentry><refentrytitle>password-request</refentrytitle>
<manvolnum>8mandos</manvolnum></citerefentry>
</para></listitem>
<listitem><para>
<citerefentry><refentrytitle>plugin-runner</refentrytitle>
<manvolnum>8mandos</manvolnum></citerefentry>
</para></listitem>
<listitem><para>
<ulink url="http://www.zeroconf.org/">Zeroconf</ulink>
</para></listitem>
<listitem><para>
<ulink url="http://www.avahi.org/">Avahi</ulink>
</para></listitem>
<listitem><para>
<ulink
url="http://www.gnu.org/software/gnutls/">GnuTLS</ulink>
</para></listitem>
<listitem><para>
<citation>RFC 4880: <citetitle>OpenPGP Message
Format</citetitle></citation>
</para></listitem>
<listitem><para>
<citation>RFC 5081: <citetitle>Using OpenPGP Keys for
Transport Layer Security</citetitle></citation>
</para></listitem>
<listitem><para>
<citation>RFC 4291: <citetitle>IP Version 6 Addressing
Architecture</citetitle>, section 2.5.6, Link-Local IPv6
Unicast Addresses</citation>
</para></listitem>
</itemizedlist>
</refsect1>
</refentry>
|