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- Committer: Teddy Hogeborn
- Date: 2008-08-17 20:34:18 UTC
- Revision ID: teddy@fukt.bsnet.se-20080817203418-l691ahxyc7vmezad
* Makefile (MANPOST): Bug fix: do not replace *all* "een" with "en".
* mandos.xml: More improvements. Replaced " with <quote>'s.
(NETWORK PROTOCOL): Replaced <informaltable> with <table> with a
<title>.
(CHECKING): New section describing the continual checking of
clients.
(LOGGING): We log to /dev/log, not syslog(3).
(FILES): Changed to use a <variablelist> instead of an
<itemizedlist>. Added "/dev/log" and brief descriptions of
all files.
(BUGS): Added content.
(EXAMPLES): - '' -
(SECURITY): Added content to subsections "SERVER" and "CLIENTS".
* mandos.xml: More improvements. Replaced " with <quote>'s.
(NETWORK PROTOCOL): Replaced <informaltable> with <table> with a
<title>.
(CHECKING): New section describing the continual checking of
clients.
(LOGGING): We log to /dev/log, not syslog(3).
(FILES): Changed to use a <variablelist> instead of an
<itemizedlist>. Added "/dev/log" and brief descriptions of
all files.
(BUGS): Added content.
(EXAMPLES): - '' -
(SECURITY): Added content to subsections "SERVER" and "CLIENTS".
- files added:
- COPYING
- files renamed:
- server.py => mandos
- server.conf => mandos.conf
- plugbasedclient.c => plugin-runner.c
- plugins.d/passprompt.c => plugins.d/password-prompt.c
- plugins.d/mandosclient.c => plugins.d/password-request.c
- files modified:
- Makefile
added
removed
mandos.xml
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<?xml version='1.0' encoding='UTF-8'?>
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<?xml-stylesheet type="text/xsl"
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href="http://docbook.sourceforge.net/release/xsl/current/manpages/docbook.xsl"?>
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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
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"http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
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<!ENTITY VERSION "1.0">
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<!ENTITY COMMANDNAME "mandos">
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]>
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<refentry>
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<refentryinfo>
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<title>&COMMANDNAME;</title>
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<!-- NWalsh's docbook scripts use this to generate the footer: -->
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<productname>&COMMANDNAME;</productname>
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<productnumber>&VERSION;</productnumber>
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<authorgroup>
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<author>
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<firstname>Björn</firstname>
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<surname>Påhlsson</surname>
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<address>
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<email>belorn@fukt.bsnet.se</email>
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</address>
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</author>
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<author>
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<firstname>Teddy</firstname>
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<surname>Hogeborn</surname>
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<address>
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<email>teddy@fukt.bsnet.se</email>
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</address>
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</author>
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</authorgroup>
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<copyright>
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<year>2008</year>
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<holder>Teddy Hogeborn</holder>
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<holder>Björn Påhlsson</holder>
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</copyright>
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<legalnotice>
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<para>
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This manual page is free software: you can redistribute it
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and/or modify it under the terms of the GNU General Public
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License as published by the Free Software Foundation,
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either version 3 of the License, or (at your option) any
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later version.
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</para>
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<para>
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This manual page is distributed in the hope that it will
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be useful, but WITHOUT ANY WARRANTY; without even the
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implied warranty of MERCHANTABILITY or FITNESS FOR A
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PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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</para>
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<para>
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You should have received a copy of the GNU General Public
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License along with this program; If not, see
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<ulink url="http://www.gnu.org/licenses/"/>.
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</para>
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</legalnotice>
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</refentryinfo>
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<refmeta>
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<refentrytitle>&COMMANDNAME;</refentrytitle>
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<manvolnum>8</manvolnum>
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</refmeta>
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<refnamediv>
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<refname><command>&COMMANDNAME;</command></refname>
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<refpurpose>
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Sends encrypted passwords to authenticated Mandos clients
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</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<cmdsynopsis>
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<command>&COMMANDNAME;</command>
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<arg choice='opt'>--interface<arg choice='plain'>IF</arg></arg>
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<arg choice='opt'>--address<arg choice='plain'>ADDRESS</arg></arg>
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<arg choice='opt'>--port<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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</cmdsynopsis>
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<cmdsynopsis>
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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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</cmdsynopsis>
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<cmdsynopsis>
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<command>&COMMANDNAME;</command>
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<arg choice='plain'>--help</arg>
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</cmdsynopsis>
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<cmdsynopsis>
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<command>&COMMANDNAME;</command>
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<arg choice='plain'>--version</arg>
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</cmdsynopsis>
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<cmdsynopsis>
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<command>&COMMANDNAME;</command>
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<arg choice='plain'>--check</arg>
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</cmdsynopsis>
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</refsynopsisdiv>
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<refsect1 id="description">
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<title>DESCRIPTION</title>
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<para>
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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. 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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</para>
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</refsect1>
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<refsect1 id="purpose">
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<title>PURPOSE</title>
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<para>
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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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normally.
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</para>
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</refsect1>
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<refsect1 id="options">
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<title>OPTIONS</title>
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<variablelist>
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<varlistentry>
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<term><literal>-h</literal>, <literal>--help</literal></term>
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<listitem>
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<para>
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Show a help message and exit
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><literal>-i</literal>, <literal>--interface <replaceable>
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IF</replaceable></literal></term>
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<listitem>
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<para>
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Only announce the server and listen to requests on network
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interface <replaceable>IF</replaceable>. Default is to
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use all available interfaces.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><literal>-a</literal>, <literal>--address <replaceable>
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ADDRESS</replaceable></literal></term>
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<listitem>
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<para>
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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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<quote><literal>::FFFF:192.0.2.3</literal></quote> syntax.
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Also, if a link-local address is specified, an interface
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should be set, since a link-local address is only valid on
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a single interface. By default, the server will listen to
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all available addresses.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><literal>-p</literal>, <literal>--port <replaceable>
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PORT</replaceable></literal></term>
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<listitem>
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<para>
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If this option is used, the server to bind to that
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port. By default, the server will listen to an arbitrary
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port given by the operating system.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><literal>--check</literal></term>
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<listitem>
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<para>
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Run the server's self-tests. This includes any unit
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tests, etc.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><literal>--debug</literal></term>
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<listitem>
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<para>
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If the server is run in debug mode, it will run in the
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foreground and print a lot of debugging information. The
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default is <emphasis>not</emphasis> to run in debug mode.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><literal>--priority <replaceable>
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PRIORITY</replaceable></literal></term>
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<listitem>
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<para>
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GnuTLS priority string for the TLS handshake with the
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clients. See
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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
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<quote><literal>SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP</literal></quote>.
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<emphasis>Warning</emphasis>: changing this may make the
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TLS handshake fail, making communication with clients
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impossible.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><literal>--servicename <replaceable>NAME</replaceable>
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</literal></term>
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<listitem>
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<para>
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Zeroconf service name. The default is
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<quote><literal>Mandos</literal></quote>. You only need
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to change this if you for some reason want to run more
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than one server on the same <emphasis>host</emphasis>,
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which would not normally be useful. If there are name
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collisions on the same <emphasis>network</emphasis>, the
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newer server will automatically rename itself to
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<quote><literal>Mandos #2</literal></quote>, and so on,
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therefore this option is not needed in that case.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><literal>--configdir <replaceable>DIR</replaceable>
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</literal></term>
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<listitem>
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<para>
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Directory to search for configuration files. Default is
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<quote><literal>/etc/mandos</literal></quote>. See
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<citerefentry><refentrytitle>mandos.conf</refentrytitle>
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<manvolnum>5</manvolnum></citerefentry> and <citerefentry>
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<refentrytitle>mandos-clients.conf</refentrytitle>
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<manvolnum>5</manvolnum></citerefentry>.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><literal>--version</literal></term>
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<listitem>
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<para>
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Prints the program version and exit.
273
</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsect1 id="protocol">
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<title>NETWORK PROTOCOL</title>
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<para>
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The Mandos server announces itself as a Zeroconf service of type
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<quote><literal>_mandos._tcp</literal></quote>. The Mandos
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client connects to the announced address and port, and sends a
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line of text where the first whitespace-separated field is the
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protocol version, which currently is
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<quote><literal>1</literal></quote>. The client and server then
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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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</para>
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<table>
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<title>Mandos Protocol (Version 1)</title><tgroup cols="3"><thead>
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<row>
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<entry>Mandos Client</entry>
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<entry>Direction</entry>
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<entry>Mandos Server</entry>
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</row>
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</thead><tbody>
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<row>
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<entry>Connect</entry>
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<entry>-><!-- → --></entry>
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</row>
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<row>
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<entry><quote><literal>1\r\en</literal></quote></entry>
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<entry>-><!-- → --></entry>
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</row>
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<row>
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<entry>TLS handshake <emphasis>as TLS <quote>server</quote>
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</emphasis></entry>
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<entry><-><!-- ⟷ --></entry>
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<entry>TLS handshake <emphasis>as TLS <quote>client</quote>
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</emphasis></entry>
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</row>
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<row>
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<entry>OpenPGP public key (part of TLS handshake)</entry>
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<entry>-><!-- → --></entry>
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</row>
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<row>
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<entry/>
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<entry><-<!-- ← --></entry>
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<entry>Binary blob (client will assume OpenPGP data)</entry>
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</row>
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<row>
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<entry/>
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<entry><-<!-- ← --></entry>
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<entry>Close</entry>
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</row>
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</tbody></tgroup></table>
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</refsect1>
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<refsect1 id="checking">
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<title>CHECKING</title>
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<para>
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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
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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
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both globally and per client; see <citerefentry>
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<refentrytitle>mandos.conf</refentrytitle>
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<manvolnum>5</manvolnum></citerefentry> and <citerefentry>
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<refentrytitle>mandos-clients.conf</refentrytitle>
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<manvolnum>5</manvolnum></citerefentry>.
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</para>
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</refsect1>
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<refsect1 id="logging">
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<title>LOGGING</title>
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<para>
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The server will send log messaged with various severity levels
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to <filename>/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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</para>
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</refsect1>
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<refsect1 id="exit_status">
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<title>EXIT STATUS</title>
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<para>
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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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</para>
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</refsect1>
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<refsect1 id="file">
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<title>FILES</title>
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<para>
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Use the <option>--configdir</option> option to change where
375
<command>&COMMANDNAME;</command> looks for its configurations
376
files. The default file names are listed here.
377
</para>
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<variablelist>
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<varlistentry>
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<term><filename>/etc/mandos/mandos.conf</filename></term>
381
<listitem>
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<para>
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Server-global settings. See
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<citerefentry><refentrytitle>mandos.conf</refentrytitle>
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<manvolnum>5</manvolnum></citerefentry> for details.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><filename>/etc/mandos/clients.conf</filename></term>
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<listitem>
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<para>
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List of clients and client-specific settings. See
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<citerefentry><refentrytitle>mandos-clients.conf</refentrytitle>
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<manvolnum>5</manvolnum></citerefentry> for details.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><filename>/var/run/mandos/mandos.pid</filename></term>
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<listitem>
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<para>
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The file containing the process id of
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<command>&COMMANDNAME;</command>.
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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><filename>/dev/log</filename></term>
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<listitem>
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<para>
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The Unix domain socket to where local syslog messages are
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sent.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsect1 id="bugs">
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<title>BUGS</title>
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<para>
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This server might, on especially fatal errors, emit a Python
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backtrace. This could be considered a feature.
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</para>
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</refsect1>
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<refsect1 id="examples">
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<title>EXAMPLES</title>
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<informalexample>
431
<para>
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Normal invocation needs no options:
433
</para>
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<para>
435
<userinput>mandos</userinput>
436
</para>
437
</informalexample>
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<informalexample>
439
<para>
440
Run the server in debug mode and read configuration files from
441
the <filename>~/mandos</filename> directory:
442
</para>
443
<para>
444
445
<!-- do not wrap this line -->
446
<userinput>mandos --debug --configdir ~/mandos --servicename Test</userinput>
447
448
</para>
449
</informalexample>
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<informalexample>
451
<para>
452
Run the server normally, but only listen to one interface and
453
only on the link-local address on that interface:
454
</para>
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<para>
456
457
<!-- do not wrap this line -->
458
<userinput>mandos --interface eth7 --address fe80::aede:48ff:fe71:f6f2</userinput>
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460
</para>
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</informalexample>
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</refsect1>
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<refsect1 id="security">
465
<title>SECURITY</title>
466
<refsect2>
467
<title>SERVER</title>
468
<para>
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Running the server should not in itself present any security
470
risk to the host computer running it.
471
</para>
472
</refsect2>
473
<refsect2>
474
<title>CLIENTS</title>
475
<para>
476
The server only gives out its stored data to clients which
477
does have the OpenPGP key of the stored fingerprint. This is
478
guaranteed by the fact that the client sends its OpenPGP
479
public key in the TLS handshake; this ensures it to be
480
genuine. The server computes the fingerprint of the key
481
itself and looks up the fingerprint in its list of
482
clients. The <filename>clients.conf</filename> file (see
483
<citerefentry><refentrytitle>mandos-clients.conf</refentrytitle>
484
<manvolnum>5</manvolnum></citerefentry>) must be non-readable
485
by anyone except the user running the server.
486
</para>
487
<para>
488
For more details on client-side security, see
489
<citerefentry><refentrytitle>password-request</refentrytitle>
490
<manvolnum>8mandos</manvolnum></citerefentry>.
491
</para>
492
</refsect2>
493
</refsect1>
494
495
<refsect1 id="see_also">
496
<title>SEE ALSO</title>
497
<itemizedlist spacing="compact">
498
<listitem><para>
499
<citerefentry><refentrytitle>password-request</refentrytitle>
500
<manvolnum>8mandos</manvolnum></citerefentry>
501
</para></listitem>
502
503
<listitem><para>
504
<citerefentry><refentrytitle>plugin-runner</refentrytitle>
505
<manvolnum>8mandos</manvolnum></citerefentry>
506
</para></listitem>
507
508
<listitem><para>
509
<ulink url="http://www.zeroconf.org/">Zeroconf</ulink>
510
</para></listitem>
511
512
<listitem><para>
513
<ulink url="http://www.avahi.org/">Avahi</ulink>
514
</para></listitem>
515
516
<listitem><para>
517
<ulink
518
url="http://www.gnu.org/software/gnutls/">GnuTLS</ulink>
519
</para></listitem>
520
521
<listitem><para>
522
<citation>RFC 4880: <citetitle>OpenPGP Message
523
Format</citetitle></citation>
524
</para></listitem>
525
526
<listitem><para>
527
<citation>RFC 5081: <citetitle>Using OpenPGP Keys for
528
Transport Layer Security</citetitle></citation>
529
</para></listitem>
530
531
<listitem><para>
532
<citation>RFC 4291: <citetitle>IP Version 6 Addressing
533
Architecture</citetitle>, section 2.5.6, Link-Local IPv6
534
Unicast Addresses</citation>
535
</para></listitem>
536
</itemizedlist>
537
</refsect1>
538
</refentry>
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0