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- Committer: Teddy Hogeborn
- Date: 2024-09-12 17:10:51 UTC
- mto: This revision was merged to the branch mainline in revision 1302.
- Revision ID: teddy@recompile.se-20240912171051-2f9urnb4e8zdttgf
Tags: version-1.8.17-1
Version 1.8.17-1
* Makefile (version): Change to "1.8.17".
* NEWS (Version 1.8.17): Add new entry.
* debian/changelog (1.8.17-1): - '' -
* Makefile (version): Change to "1.8.17".
* NEWS (Version 1.8.17): Add new entry.
* debian/changelog (1.8.17-1): - '' -
- files added:
- bugs.xml
- debian/tests
- debian/upstream
- dracut-module
- plugin-helpers
- files removed:
- initramfs-tools-hook-conf
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.xml
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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 COMMANDNAME "mandos-client">
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<!ENTITY TIMESTAMP "2013-10-20">
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<!ENTITY TIMESTAMP "2023-10-21">
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<!ENTITY % common SYSTEM "../common.ent">
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%common;
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]>
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<copyright>
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<year>2008</year>
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<year>2009</year>
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<year>2010</year>
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<year>2011</year>
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<year>2012</year>
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<year>2013</year>
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<year>2014</year>
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<year>2015</year>
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<year>2016</year>
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<year>2017</year>
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<year>2018</year>
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<year>2019</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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<replaceable>FILE</replaceable></option></arg>
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</group>
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<sbr/>
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<group>
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<arg choice="plain"><option>--tls-privkey
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<replaceable>FILE</replaceable></option></arg>
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<arg choice="plain"><option>-t
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<replaceable>FILE</replaceable></option></arg>
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</group>
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<sbr/>
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<group>
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<arg choice="plain"><option>--tls-pubkey
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<replaceable>FILE</replaceable></option></arg>
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<arg choice="plain"><option>-T
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<replaceable>FILE</replaceable></option></arg>
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</group>
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<sbr/>
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<arg>
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<option>--priority <replaceable>STRING</replaceable></option>
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</arg>
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</arg>
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<sbr/>
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<arg>
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<option>--dh-params <replaceable>FILE</replaceable></option>
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</arg>
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<sbr/>
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<arg>
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<option>--delay <replaceable>SECONDS</replaceable></option>
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</arg>
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<sbr/>
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brings up network interfaces, uses the interfaces’ IPv6
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link-local addresses to get network connectivity, uses Zeroconf
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to find servers on the local network, and communicates with
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servers using TLS with an OpenPGP key to ensure authenticity and
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confidentiality. This client program keeps running, trying all
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servers on the network, until it receives a satisfactory reply
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or a TERM signal. After all servers have been tried, all
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servers using TLS with a raw public key to ensure authenticity
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and confidentiality. This client program keeps running, trying
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all servers on the network, until it receives a satisfactory
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reply or a TERM signal. After all servers have been tried, all
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servers are periodically retried. If no servers are found it
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will wait indefinitely for new servers to appear.
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</para>
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</para>
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<para>
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This program is not meant to be run directly; it is really meant
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to run as a plugin of the <application>Mandos</application>
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<citerefentry><refentrytitle>plugin-runner</refentrytitle>
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<manvolnum>8mandos</manvolnum></citerefentry>, which runs in the
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initial <acronym>RAM</acronym> disk environment because it is
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specified as a <quote>keyscript</quote> in the <citerefentry>
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<refentrytitle>crypttab</refentrytitle><manvolnum>5</manvolnum>
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</citerefentry> file.
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to be run by other programs in the initial
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<acronym>RAM</acronym> disk environment; see <xref
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linkend="overview"/>.
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</para>
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</refsect1>
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<title>OPTIONS</title>
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<para>
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This program is commonly not invoked from the command line; it
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is normally started by the <application>Mandos</application>
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plugin runner, see <citerefentry><refentrytitle
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>plugin-runner</refentrytitle><manvolnum>8mandos</manvolnum>
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</citerefentry>. Any command line options this program accepts
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are therefore normally provided by the plugin runner, and not
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directly.
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is normally started by another program as described in <xref
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linkend="description"/>. Any command line options this program
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accepts are therefore normally provided by the invoking program,
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and not directly.
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</para>
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<variablelist>
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assumed to separate the address from the port number.
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</para>
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<para>
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This option is normally only useful for testing and
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debugging.
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Normally, Zeroconf would be used to locate Mandos servers,
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in which case this option would only be used when testing
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and debugging.
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</para>
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</listitem>
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</varlistentry>
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<para>
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<replaceable>NAME</replaceable> can be the string
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<quote><literal>none</literal></quote>; this will make
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<command>&COMMANDNAME;</command> not bring up
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<emphasis>any</emphasis> interfaces specified
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<emphasis>after</emphasis> this string. This is not
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recommended, and only meant for advanced users.
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<command>&COMMANDNAME;</command> only bring up interfaces
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specified <emphasis>before</emphasis> this string. This
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is not recommended, and only meant for advanced users.
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</para>
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</listitem>
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</varlistentry>
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</varlistentry>
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<varlistentry>
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<term><option>--tls-pubkey=<replaceable
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>FILE</replaceable></option></term>
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<term><option>-T
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<replaceable>FILE</replaceable></option></term>
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<listitem>
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<para>
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TLS raw public key file name. The default name is
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<quote><filename>/conf/conf.d/mandos/tls-pubkey.pem</filename
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></quote>.
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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><option>--tls-privkey=<replaceable
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>FILE</replaceable></option></term>
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<term><option>-t
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<replaceable>FILE</replaceable></option></term>
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<listitem>
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<para>
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TLS secret key file name. The default name is
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<quote><filename>/conf/conf.d/mandos/tls-privkey.pem</filename
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></quote>.
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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><option>--priority=<replaceable
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>STRING</replaceable></option></term>
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<listitem>
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<listitem>
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<para>
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Sets the number of bits to use for the prime number in the
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TLS Diffie-Hellman key exchange. Default is 1024.
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TLS Diffie-Hellman key exchange. The default value is
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selected automatically based on the GnuTLS security
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profile set in its priority string. Note that if the
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<option>--dh-params</option> option is used, the values
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from that file will be used instead.
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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><option>--dh-params=<replaceable
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>FILE</replaceable></option></term>
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<listitem>
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<para>
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Specifies a PEM-encoded PKCS#3 file to read the parameters
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needed by the TLS Diffie-Hellman key exchange from. If
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this option is not given, or if the file for some reason
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could not be used, the parameters will be generated on
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startup, which will take some time and processing power.
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Those using servers running under time, power or processor
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constraints may want to generate such a file in advance
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and use this option.
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</para>
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</listitem>
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</varlistentry>
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<title>OVERVIEW</title>
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<xi:include href="../overview.xml"/>
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<para>
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This program is the client part. It is a plugin started by
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<citerefentry><refentrytitle>plugin-runner</refentrytitle>
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<manvolnum>8mandos</manvolnum></citerefentry> which will run in
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an initial <acronym>RAM</acronym> disk environment.
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This program is the client part. It is run automatically in an
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initial <acronym>RAM</acronym> disk environment.
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</para>
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<para>
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In an initial <acronym>RAM</acronym> disk environment using
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<citerefentry><refentrytitle>systemd</refentrytitle>
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<manvolnum>1</manvolnum></citerefentry>, this program is started
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by the <application>Mandos</application> <citerefentry>
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<refentrytitle>password-agent</refentrytitle>
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<manvolnum>8mandos</manvolnum></citerefentry>, which in turn is
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started automatically by the <citerefentry>
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<refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum>
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</citerefentry> <quote>Password Agent</quote> system.
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</para>
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<para>
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In the case of a non-<citerefentry>
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<refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum>
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</citerefentry> environment, this program is started as a plugin
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of the <application>Mandos</application> <citerefentry>
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<refentrytitle>plugin-runner</refentrytitle>
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<manvolnum>8mandos</manvolnum></citerefentry>, which runs in the
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initial <acronym>RAM</acronym> disk environment because it is
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specified as a <quote>keyscript</quote> in the <citerefentry>
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<refentrytitle>crypttab</refentrytitle><manvolnum>5</manvolnum>
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</citerefentry> file.
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</para>
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<para>
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This program could, theoretically, be used as a keyscript in
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<filename>/etc/crypttab</filename>, but it would then be
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impossible to enter a password for the encrypted root disk at
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the console, since this program does not read from the console
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at all. This is why a separate plugin runner (<citerefentry>
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<refentrytitle>plugin-runner</refentrytitle>
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<manvolnum>8mandos</manvolnum></citerefentry>) is used to run
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both this program and others in in parallel,
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<emphasis>one</emphasis> of which (<citerefentry>
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<refentrytitle>password-prompt</refentrytitle>
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<manvolnum>8mandos</manvolnum></citerefentry>) will prompt for
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passwords on the system console.
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at all.
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</para>
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</refsect1>
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<refsect1 id="environment">
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<title>ENVIRONMENT</title>
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<variablelist>
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<varlistentry>
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<term><envar>MANDOSPLUGINHELPERDIR</envar></term>
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<listitem>
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<para>
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This environment variable will be assumed to contain the
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directory containing any helper executables. The use and
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nature of these helper executables, if any, is purposely
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not documented.
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</para>
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</listitem>
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</varlistentry>
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</variablelist>
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<para>
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This program does not use any environment variables, not even
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the ones provided by <citerefentry><refentrytitle
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This program does not use any other environment variables, not
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even the ones provided by <citerefentry><refentrytitle
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>cryptsetup</refentrytitle><manvolnum>8</manvolnum>
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</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><filename>/conf/conf.d/mandos/tls-pubkey.pem</filename
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></term>
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<term><filename>/conf/conf.d/mandos/tls-privkey.pem</filename
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></term>
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<listitem>
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<para>
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Public and private raw key files, in <quote>PEM</quote>
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format. These are the default file names, they can be
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changed with the <option>--tls-pubkey</option> and
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<option>--tls-privkey</option> options.
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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
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class="directory">/lib/mandos/network-hooks.d</filename></term>
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<listitem>
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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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<!-- </para> -->
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<!-- </refsect1> -->
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<refsect1 id="bugs">
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<title>BUGS</title>
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<xi:include href="../bugs.xml"/>
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</refsect1>
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<refsect1 id="example">
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<title>EXAMPLE</title>
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<para>
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Note that normally, command line options will not be given
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directly, but via options for the Mandos <citerefentry
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><refentrytitle>plugin-runner</refentrytitle>
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<manvolnum>8mandos</manvolnum></citerefentry>.
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directly, but passed on via the program responsible for starting
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this program; see <xref linkend="overview"/>.
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</para>
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<informalexample>
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<para>
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</informalexample>
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<informalexample>
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<para>
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Run in debug mode, and use a custom key:
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Run in debug mode, and use custom keys:
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</para>
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<para>
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<!-- do not wrap this line -->
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<userinput>&COMMANDNAME; --debug --pubkey keydir/pubkey.txt --seckey keydir/seckey.txt</userinput>
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<userinput>&COMMANDNAME; --debug --pubkey keydir/pubkey.txt --seckey keydir/seckey.txt --tls-pubkey keydir/tls-pubkey.pem --tls-privkey keydir/tls-privkey.pem</userinput>
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</para>
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</informalexample>
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<informalexample>
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<para>
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Run in debug mode, with a custom key, and do not use Zeroconf
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Run in debug mode, with custom keys, and do not use Zeroconf
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to locate a server; connect directly to the IPv6 link-local
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address <quote><systemitem class="ipaddress"
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>fe80::aede:48ff:fe71:f6f2</systemitem></quote>, port 4711,
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<para>
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<!-- do not wrap this line -->
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<userinput>&COMMANDNAME; --debug --pubkey keydir/pubkey.txt --seckey keydir/seckey.txt --connect fe80::aede:48ff:fe71:f6f2:4711 --interface eth2</userinput>
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<userinput>&COMMANDNAME; --debug --pubkey keydir/pubkey.txt --seckey keydir/seckey.txt --tls-pubkey keydir/tls-pubkey.pem --tls-privkey keydir/tls-privkey.pem --connect fe80::aede:48ff:fe71:f6f2:4711 --interface eth2</userinput>
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</para>
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</informalexample>
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<refsect1 id="security">
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<title>SECURITY</title>
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<para>
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This program is set-uid to root, but will switch back to the
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original (and presumably non-privileged) user and group after
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bringing up the network interface.
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This program assumes that it is set-uid to root, and will switch
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back to the original (and presumably non-privileged) user and
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group after bringing up the network interface.
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</para>
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<para>
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To use this program for its intended purpose (see <xref
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<para>
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The only remaining weak point is that someone with physical
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access to the client hard drive might turn off the client
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computer, read the OpenPGP keys directly from the hard drive,
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and communicate with the server. To safeguard against this, the
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server is supposed to notice the client disappearing and stop
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giving out the encrypted data. Therefore, it is important to
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set the timeout and checker interval values tightly on the
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server. See <citerefentry><refentrytitle
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computer, read the OpenPGP and TLS keys directly from the hard
848
drive, and communicate with the server. To safeguard against
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this, the server is supposed to notice the client disappearing
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and stop giving out the encrypted data. Therefore, it is
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important to set the timeout and checker interval values tightly
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on the server. See <citerefentry><refentrytitle
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853
>mandos</refentrytitle><manvolnum>8</manvolnum></citerefentry>.
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</para>
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<para>
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It will also help if the checker program on the server is
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configured to request something from the client which can not be
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spoofed by someone else on the network, unlike unencrypted
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<acronym>ICMP</acronym> echo (<quote>ping</quote>) replies.
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spoofed by someone else on the network, like SSH server key
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fingerprints, and unlike unencrypted <acronym>ICMP</acronym>
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echo (<quote>ping</quote>) replies.
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</para>
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<para>
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<emphasis>Note</emphasis>: This makes it completely insecure to
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<manvolnum>5</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>mandos</refentrytitle>
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<manvolnum>8</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>password-prompt</refentrytitle>
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<citerefentry><refentrytitle>password-agent</refentrytitle>
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<manvolnum>8mandos</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>plugin-runner</refentrytitle>
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<manvolnum>8mandos</manvolnum></citerefentry>
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</varlistentry>
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<varlistentry>
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<term>
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<ulink url="http://www.avahi.org/">Avahi</ulink>
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<ulink url="https://www.avahi.org/">Avahi</ulink>
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</term>
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<listitem>
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<para>
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</varlistentry>
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<varlistentry>
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<term>
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<ulink url="http://www.gnu.org/software/gnutls/"
804
>GnuTLS</ulink>
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<ulink url="https://www.gnutls.org/">GnuTLS</ulink>
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</term>
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<listitem>
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<para>
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GnuTLS is the library this client uses to implement TLS for
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communicating securely with the server, and at the same time
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send the public OpenPGP key to the server.
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send the public key to the server.
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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>
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<ulink url="http://www.gnupg.org/related_software/gpgme/"
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<ulink url="https://www.gnupg.org/related_software/gpgme/"
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>GPGME</ulink>
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</term>
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<listitem>
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</varlistentry>
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<varlistentry>
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<term>
860
RFC 4346: <citetitle>The Transport Layer Security (TLS)
861
Protocol Version 1.1</citetitle>
968
RFC 5246: <citetitle>The Transport Layer Security (TLS)
969
Protocol Version 1.2</citetitle>
862
970
</term>
863
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<listitem>
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<para>
865
TLS 1.1 is the protocol implemented by GnuTLS.
973
TLS 1.2 is the protocol implemented by GnuTLS.
866
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</para>
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</listitem>
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</varlistentry>
879
987
</varlistentry>
880
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<varlistentry>
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989
<term>
882
RFC 5081: <citetitle>Using OpenPGP Keys for Transport Layer
990
RFC 7250: <citetitle>Using Raw Public Keys in Transport
991
Layer Security (TLS) and Datagram Transport Layer Security
992
(DTLS)</citetitle>
993
</term>
994
<listitem>
995
<para>
996
This is implemented by GnuTLS in version 3.6.6 and is, if
997
present, used by this program so that raw public keys can be
998
used.
999
</para>
1000
</listitem>
1001
</varlistentry>
1002
<varlistentry>
1003
<term>
1004
RFC 6091: <citetitle>Using OpenPGP Keys for Transport Layer
883
1005
Security</citetitle>
884
1006
</term>
885
1007
<listitem>
886
1008
<para>
887
This is implemented by GnuTLS and used by this program so
888
that OpenPGP keys can be used.
1009
This is implemented by GnuTLS before version 3.6.0 and is,
1010
if present, used by this program so that OpenPGP keys can be
1011
used.
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</para>
890
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</listitem>
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</varlistentry>
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0