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- Committer: Teddy Hogeborn
- Date: 2024-09-12 02:53:43 UTC
- mto: This revision was merged to the branch mainline in revision 410.
- Revision ID: teddy@recompile.se-20240912025343-05elzcldczplvk89
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- files added:
- DBUS-API
- debian/source
- debian/tests
- debian/upstream
- dracut-module
- network-hooks.d
- plugin-helpers
- files removed:
- initramfs-tools-hook-conf
- files modified:
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added
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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 "2009-01-04">
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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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<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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<email>belorn@recompile.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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<email>teddy@recompile.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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<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>PORT</replaceable></option></arg>
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</group>
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<sbr/>
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<group>
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<group rep='repeat'>
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<arg choice="plain"><option>--interface
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<replaceable>NAME</replaceable></option></arg>
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<arg choice="plain"><option>-i
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<replaceable>NAME</replaceable></option></arg>
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<replaceable>NAME</replaceable><arg rep='repeat'
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>,<replaceable>NAME</replaceable></arg></option></arg>
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<arg choice="plain"><option>-i <replaceable>NAME</replaceable
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><arg rep='repeat'>,<replaceable>NAME</replaceable></arg
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></option></arg>
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</group>
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<sbr/>
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<group>
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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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<arg>
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<option>--retry <replaceable>SECONDS</replaceable></option>
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</arg>
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<sbr/>
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<arg>
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<option>--network-hook-dir
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<replaceable>DIR</replaceable></option>
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</arg>
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<sbr/>
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<arg>
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<option>--debug</option>
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</arg>
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</cmdsynopsis>
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<command>&COMMANDNAME;</command> is a client program that
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communicates with <citerefentry><refentrytitle
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>mandos</refentrytitle><manvolnum>8</manvolnum></citerefentry>
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to get a password. It uses IPv6 link-local addresses to get
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network connectivity, Zeroconf to find servers, and TLS with an
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OpenPGP key to ensure authenticity and confidentiality. It
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keeps running, trying all servers on the network, until it
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receives a satisfactory reply or a TERM signal is received.
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to get a password. In slightly more detail, this client program
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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 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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The network interfaces are selected like this: If any interfaces
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are specified using the <option>--interface</option> option,
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those interface are used. Otherwise,
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<command>&COMMANDNAME;</command> will use all interfaces that
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are not loopback interfaces, are not point-to-point interfaces,
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are capable of broadcasting and do not have the NOARP flag (see
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<citerefentry><refentrytitle>netdevice</refentrytitle>
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<manvolnum>7</manvolnum></citerefentry>). (If the
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<option>--connect</option> option is used, point-to-point
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interfaces and non-broadcast interfaces are accepted.) If any
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used interfaces are not up and running, they are first taken up
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(and later taken down again on program exit).
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</para>
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<para>
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Before network interfaces are selected, all <quote>network
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hooks</quote> are run; see <xref linkend="network-hooks"/>.
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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.
219
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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<varlistentry>
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<term><option>--interface=
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<replaceable>NAME</replaceable></option></term>
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<term><option>--interface=<replaceable
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>NAME</replaceable><arg rep='repeat'>,<replaceable
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>NAME</replaceable></arg></option></term>
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<term><option>-i
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<replaceable>NAME</replaceable></option></term>
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<replaceable>NAME</replaceable><arg rep='repeat'>,<replaceable
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>NAME</replaceable></arg></option></term>
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<listitem>
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<para>
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Network interface that will be brought up and scanned for
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Mandos servers to connect to. The default it
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<quote><literal>eth0</literal></quote>.
198
</para>
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<para>
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If the <option>--connect</option> option is used, this
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specifies the interface to use to connect to the address
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given.
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Comma separated list of network interfaces that will be
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brought up and scanned for Mandos servers to connect to.
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The default is the empty string, which will automatically
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use all appropriate interfaces.
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</para>
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<para>
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If the <option>--connect</option> option is used, and
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exactly one interface name is specified (except
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<quote><literal>none</literal></quote>), this specifies
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the interface to use to connect to the address given.
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</para>
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<para>
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Note that since this program will normally run in the
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initial RAM disk environment, the interface must be an
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interface which exists at that stage. Thus, the interface
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can normally not be a pseudo-interface such as
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<quote>br0</quote> or <quote>tun0</quote>; such interfaces
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will not exist until much later in the boot process, and
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can not be used by this program, unless created by a
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<quote>network hook</quote> — see <xref
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linkend="network-hooks"/>.
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</para>
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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> 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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<varlistentry>
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<term><option>--delay=<replaceable
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>SECONDS</replaceable></option></term>
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<listitem>
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<para>
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After bringing a network interface up, the program waits
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for the interface to arrive in a <quote>running</quote>
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state before proceeding. During this time, the kernel log
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level will be lowered to reduce clutter on the system
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console, alleviating any other plugins which might be
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using the system console. This option sets the upper
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limit of seconds to wait. The default is 2.5 seconds.
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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>--retry=<replaceable
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>SECONDS</replaceable></option></term>
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<listitem>
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<para>
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All Mandos servers are tried repeatedly until a password
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is received. This value specifies, in seconds, how long
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between each successive try <emphasis>for the same
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server</emphasis>. The default is 10 seconds.
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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>--network-hook-dir=<replaceable
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>DIR</replaceable></option></term>
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<listitem>
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<para>
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Network hook directory. The default directory is
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<quote><filename class="directory"
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>/lib/mandos/network-hooks.d</filename></quote>.
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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 will prompt for passwords on
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the system console.
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at all.
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</para>
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</refsect1>
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server could be found and the password received from it could be
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successfully decrypted and output on standard output. The
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program will exit with a non-zero exit status only if a critical
332
error occurs. Otherwise, it will forever connect to new
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<application>Mandos</application> servers as they appear, trying
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to get a decryptable password and print it.
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error occurs. Otherwise, it will forever connect to any
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discovered <application>Mandos</application> servers, trying to
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get a decryptable password and print it.
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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
535
directory containing any helper executables. The use and
536
nature of these helper executables, if any, is purposely
537
not documented.
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</para>
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</listitem>
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</varlistentry>
541
</variablelist>
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<para>
341
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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545
>cryptsetup</refentrytitle><manvolnum>8</manvolnum>
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</citerefentry>.
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</para>
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</refsect1>
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<refsect1 id="network-hooks">
551
<title>NETWORK HOOKS</title>
552
<para>
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If a network interface like a bridge or tunnel is required to
554
find a Mandos server, this requires the interface to be up and
555
running before <command>&COMMANDNAME;</command> starts looking
556
for Mandos servers. This can be accomplished by creating a
557
<quote>network hook</quote> program, and placing it in a special
558
directory.
559
</para>
560
<para>
561
Before the network is used (and again before program exit), any
562
runnable programs found in the network hook directory are run
563
with the argument <quote><literal>start</literal></quote> or
564
<quote><literal>stop</literal></quote>. This should bring up or
565
down, respectively, any network interface which
566
<command>&COMMANDNAME;</command> should use.
567
</para>
568
<refsect2 id="hook-requirements">
569
<title>REQUIREMENTS</title>
570
<para>
571
A network hook must be an executable file, and its name must
572
consist entirely of upper and lower case letters, digits,
573
underscores, periods, and hyphens.
574
</para>
575
<para>
576
A network hook will receive one argument, which can be one of
577
the following:
578
</para>
579
<variablelist>
580
<varlistentry>
581
<term><literal>start</literal></term>
582
<listitem>
583
<para>
584
This should make the network hook create (if necessary)
585
and bring up a network interface.
586
</para>
587
</listitem>
588
</varlistentry>
589
<varlistentry>
590
<term><literal>stop</literal></term>
591
<listitem>
592
<para>
593
This should make the network hook take down a network
594
interface, and delete it if it did not exist previously.
595
</para>
596
</listitem>
597
</varlistentry>
598
<varlistentry>
599
<term><literal>files</literal></term>
600
<listitem>
601
<para>
602
This should make the network hook print, <emphasis>one
603
file per line</emphasis>, all the files needed for it to
604
run. (These files will be copied into the initial RAM
605
filesystem.) Typical use is for a network hook which is
606
a shell script to print its needed binaries.
607
</para>
608
<para>
609
It is not necessary to print any non-executable files
610
already in the network hook directory, these will be
611
copied implicitly if they otherwise satisfy the name
612
requirements.
613
</para>
614
</listitem>
615
</varlistentry>
616
<varlistentry>
617
<term><literal>modules</literal></term>
618
<listitem>
619
<para>
620
This should make the network hook print, <emphasis>on
621
separate lines</emphasis>, all the kernel modules needed
622
for it to run. (These modules will be copied into the
623
initial RAM filesystem.) For instance, a tunnel
624
interface needs the
625
<quote><literal>tun</literal></quote> module.
626
</para>
627
</listitem>
628
</varlistentry>
629
</variablelist>
630
<para>
631
The network hook will be provided with a number of environment
632
variables:
633
</para>
634
<variablelist>
635
<varlistentry>
636
<term><envar>MANDOSNETHOOKDIR</envar></term>
637
<listitem>
638
<para>
639
The network hook directory, specified to
640
<command>&COMMANDNAME;</command> by the
641
<option>--network-hook-dir</option> option. Note: this
642
should <emphasis>always</emphasis> be used by the
643
network hook to refer to itself or any files in the hook
644
directory it may require.
645
</para>
646
</listitem>
647
</varlistentry>
648
<varlistentry>
649
<term><envar>DEVICE</envar></term>
650
<listitem>
651
<para>
652
The network interfaces, as specified to
653
<command>&COMMANDNAME;</command> by the
654
<option>--interface</option> option, combined to one
655
string and separated by commas. If this is set, and
656
does not contain the interface a hook will bring up,
657
there is no reason for a hook to continue.
658
</para>
659
</listitem>
660
</varlistentry>
661
<varlistentry>
662
<term><envar>MODE</envar></term>
663
<listitem>
664
<para>
665
This will be the same as the first argument;
666
i.e. <quote><literal>start</literal></quote>,
667
<quote><literal>stop</literal></quote>,
668
<quote><literal>files</literal></quote>, or
669
<quote><literal>modules</literal></quote>.
670
</para>
671
</listitem>
672
</varlistentry>
673
<varlistentry>
674
<term><envar>VERBOSITY</envar></term>
675
<listitem>
676
<para>
677
This will be the <quote><literal>1</literal></quote> if
678
the <option>--debug</option> option is passed to
679
<command>&COMMANDNAME;</command>, otherwise
680
<quote><literal>0</literal></quote>.
681
</para>
682
</listitem>
683
</varlistentry>
684
<varlistentry>
685
<term><envar>DELAY</envar></term>
686
<listitem>
687
<para>
688
This will be the same as the <option>--delay</option>
689
option passed to <command>&COMMANDNAME;</command>. Is
690
only set if <envar>MODE</envar> is
691
<quote><literal>start</literal></quote> or
692
<quote><literal>stop</literal></quote>.
693
</para>
694
</listitem>
695
</varlistentry>
696
<varlistentry>
697
<term><envar>CONNECT</envar></term>
698
<listitem>
699
<para>
700
This will be the same as the <option>--connect</option>
701
option passed to <command>&COMMANDNAME;</command>. Is
702
only set if <option>--connect</option> is passed and
703
<envar>MODE</envar> is
704
<quote><literal>start</literal></quote> or
705
<quote><literal>stop</literal></quote>.
706
</para>
707
</listitem>
708
</varlistentry>
709
</variablelist>
710
<para>
711
A hook may not read from standard input, and should be
712
restrictive in printing to standard output or standard error
713
unless <varname>VERBOSITY</varname> is
714
<quote><literal>1</literal></quote>.
715
</para>
716
</refsect2>
717
</refsect1>
718
348
719
<refsect1 id="files">
349
720
<title>FILES</title>
350
721
<variablelist>
362
733
</para>
363
734
</listitem>
364
735
</varlistentry>
736
<varlistentry>
737
<term><filename>/conf/conf.d/mandos/tls-pubkey.pem</filename
738
></term>
739
<term><filename>/conf/conf.d/mandos/tls-privkey.pem</filename
740
></term>
741
<listitem>
742
<para>
743
Public and private raw key files, in <quote>PEM</quote>
744
format. These are the default file names, they can be
745
changed with the <option>--tls-pubkey</option> and
746
<option>--tls-privkey</option> options.
747
</para>
748
</listitem>
749
</varlistentry>
750
<varlistentry>
751
<term><filename
752
class="directory">/lib/mandos/network-hooks.d</filename></term>
753
<listitem>
754
<para>
755
Directory where network hooks are located. Change this
756
with the <option>--network-hook-dir</option> option. See
757
<xref linkend="network-hooks"/>.
758
</para>
759
</listitem>
760
</varlistentry>
365
761
</variablelist>
366
762
</refsect1>
367
763
368
<!-- <refsect1 id="bugs"> -->
369
<!-- <title>BUGS</title> -->
370
<!-- <para> -->
371
<!-- </para> -->
372
<!-- </refsect1> -->
764
<refsect1 id="bugs">
765
<title>BUGS</title>
766
<xi:include href="../bugs.xml"/>
767
</refsect1>
373
768
374
769
<refsect1 id="example">
375
770
<title>EXAMPLE</title>
376
771
<para>
377
772
Note that normally, command line options will not be given
378
directly, but via options for the Mandos <citerefentry
379
><refentrytitle>plugin-runner</refentrytitle>
380
<manvolnum>8mandos</manvolnum></citerefentry>.
773
directly, but passed on via the program responsible for starting
774
this program; see <xref linkend="overview"/>.
381
775
</para>
382
776
<informalexample>
383
777
<para>
384
Normal invocation needs no options, if the network interface
385
is <quote>eth0</quote>:
778
Normal invocation needs no options, if the network interfaces
779
can be automatically determined:
386
780
</para>
387
781
<para>
388
782
<userinput>&COMMANDNAME;</userinput>
390
784
</informalexample>
391
785
<informalexample>
392
786
<para>
393
Search for Mandos servers (and connect to them) using another
394
interface:
787
Search for Mandos servers (and connect to them) using one
788
specific interface:
395
789
</para>
396
790
<para>
397
791
<!-- do not wrap this line -->
400
794
</informalexample>
401
795
<informalexample>
402
796
<para>
403
Run in debug mode, and use a custom key:
797
Run in debug mode, and use custom keys:
404
798
</para>
405
799
<para>
406
800
407
801
<!-- do not wrap this line -->
408
<userinput>&COMMANDNAME; --debug --pubkey keydir/pubkey.txt --seckey keydir/seckey.txt</userinput>
802
<userinput>&COMMANDNAME; --debug --pubkey keydir/pubkey.txt --seckey keydir/seckey.txt --tls-pubkey keydir/tls-pubkey.pem --tls-privkey keydir/tls-privkey.pem</userinput>
409
803
410
804
</para>
411
805
</informalexample>
412
806
<informalexample>
413
807
<para>
414
Run in debug mode, with a custom key, and do not use Zeroconf
415
to locate a server; connect directly to the IPv6 address
416
<quote><systemitem class="ipaddress"
417
>2001:db8:f983:bd0b:30de:ae4a:71f2:f672</systemitem></quote>,
418
port 4711, using interface eth2:
808
Run in debug mode, with custom keys, and do not use Zeroconf
809
to locate a server; connect directly to the IPv6 link-local
810
address <quote><systemitem class="ipaddress"
811
>fe80::aede:48ff:fe71:f6f2</systemitem></quote>, port 4711,
812
using interface eth2:
419
813
</para>
420
814
<para>
421
815
422
816
<!-- do not wrap this line -->
423
<userinput>&COMMANDNAME; --debug --pubkey keydir/pubkey.txt --seckey keydir/seckey.txt --connect 2001:db8:f983:bd0b:30de:ae4a:71f2:f672:4711 --interface eth2</userinput>
817
<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>
424
818
425
819
</para>
426
820
</informalexample>
429
823
<refsect1 id="security">
430
824
<title>SECURITY</title>
431
825
<para>
432
This program is set-uid to root, but will switch back to the
433
original (and presumably non-privileged) user and group after
434
bringing up the network interface.
826
This program assumes that it is set-uid to root, and will switch
827
back to the original (and presumably non-privileged) user and
828
group after bringing up the network interface.
435
829
</para>
436
830
<para>
437
831
To use this program for its intended purpose (see <xref
450
844
<para>
451
845
The only remaining weak point is that someone with physical
452
846
access to the client hard drive might turn off the client
453
computer, read the OpenPGP keys directly from the hard drive,
454
and communicate with the server. To safeguard against this, the
455
server is supposed to notice the client disappearing and stop
456
giving out the encrypted data. Therefore, it is important to
457
set the timeout and checker interval values tightly on the
458
server. See <citerefentry><refentrytitle
847
computer, read the OpenPGP and TLS keys directly from the hard
848
drive, and communicate with the server. To safeguard against
849
this, the server is supposed to notice the client disappearing
850
and stop giving out the encrypted data. Therefore, it is
851
important to set the timeout and checker interval values tightly
852
on the server. See <citerefentry><refentrytitle
459
853
>mandos</refentrytitle><manvolnum>8</manvolnum></citerefentry>.
460
854
</para>
461
855
<para>
462
856
It will also help if the checker program on the server is
463
857
configured to request something from the client which can not be
464
spoofed by someone else on the network, unlike unencrypted
465
<acronym>ICMP</acronym> echo (<quote>ping</quote>) replies.
858
spoofed by someone else on the network, like SSH server key
859
fingerprints, and unlike unencrypted <acronym>ICMP</acronym>
860
echo (<quote>ping</quote>) replies.
466
861
</para>
467
862
<para>
468
863
<emphasis>Note</emphasis>: This makes it completely insecure to
476
871
<refsect1 id="see_also">
477
872
<title>SEE ALSO</title>
478
873
<para>
874
<citerefentry><refentrytitle>intro</refentrytitle>
875
<manvolnum>8mandos</manvolnum></citerefentry>,
479
876
<citerefentry><refentrytitle>cryptsetup</refentrytitle>
480
877
<manvolnum>8</manvolnum></citerefentry>,
481
878
<citerefentry><refentrytitle>crypttab</refentrytitle>
482
879
<manvolnum>5</manvolnum></citerefentry>,
483
880
<citerefentry><refentrytitle>mandos</refentrytitle>
484
881
<manvolnum>8</manvolnum></citerefentry>,
485
<citerefentry><refentrytitle>password-prompt</refentrytitle>
882
<citerefentry><refentrytitle>password-agent</refentrytitle>
486
883
<manvolnum>8mandos</manvolnum></citerefentry>,
487
884
<citerefentry><refentrytitle>plugin-runner</refentrytitle>
488
885
<manvolnum>8mandos</manvolnum></citerefentry>
501
898
</varlistentry>
502
899
<varlistentry>
503
900
<term>
504
<ulink url="http://www.avahi.org/">Avahi</ulink>
901
<ulink url="https://www.avahi.org/">Avahi</ulink>
505
902
</term>
506
903
<listitem>
507
904
<para>
512
909
</varlistentry>
513
910
<varlistentry>
514
911
<term>
515
<ulink url="http://www.gnu.org/software/gnutls/"
516
>GnuTLS</ulink>
912
<ulink url="https://www.gnutls.org/">GnuTLS</ulink>
517
913
</term>
518
914
<listitem>
519
915
<para>
520
916
GnuTLS is the library this client uses to implement TLS for
521
917
communicating securely with the server, and at the same time
522
send the public OpenPGP key to the server.
918
send the public key to the server.
523
919
</para>
524
920
</listitem>
525
921
</varlistentry>
526
922
<varlistentry>
527
923
<term>
528
<ulink url="http://www.gnupg.org/related_software/gpgme/"
924
<ulink url="https://www.gnupg.org/related_software/gpgme/"
529
925
>GPGME</ulink>
530
926
</term>
531
927
<listitem>
559
955
<para>
560
956
This client uses IPv6 link-local addresses, which are
561
957
immediately usable since a link-local addresses is
562
automatically assigned to a network interfaces when it
958
automatically assigned to a network interface when it
563
959
is brought up.
564
960
</para>
565
961
</listitem>
569
965
</varlistentry>
570
966
<varlistentry>
571
967
<term>
572
RFC 4346: <citetitle>The Transport Layer Security (TLS)
573
Protocol Version 1.1</citetitle>
968
RFC 5246: <citetitle>The Transport Layer Security (TLS)
969
Protocol Version 1.2</citetitle>
574
970
</term>
575
971
<listitem>
576
972
<para>
577
TLS 1.1 is the protocol implemented by GnuTLS.
973
TLS 1.2 is the protocol implemented by GnuTLS.
578
974
</para>
579
975
</listitem>
580
976
</varlistentry>
591
987
</varlistentry>
592
988
<varlistentry>
593
989
<term>
594
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
595
1005
Security</citetitle>
596
1006
</term>
597
1007
<listitem>
598
1008
<para>
599
This is implemented by GnuTLS and used by this program so
600
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.
601
1012
</para>
602
1013
</listitem>
603
1014
</varlistentry>
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0