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- Committer: teddy at recompile
- Date: 2020-02-05 21:39:28 UTC
- Revision ID: teddy@recompile.se-20200205213928-vpvt0fwfg47ikv6f
Allow users to alter ask-password-mandos.service
If a user uses dracut with systemd and wishes to modify the options
passed to password-agent(8mandos) or mandos-client(8mandos), they
should be able to do so by simply creating a file
/etc/systemd/system/ask-password-mandos.service.d/override.conf,
containing, for instance:
[Service]
Environment=MANDOS_CLIENT_OPTIONS=--debug
Adding PASSWORD_AGENT_OPTIONS should also be possible (but should not
normally be needed).
* dracut-module/ask-password-mandos.service ([Service]/ExecStart): Add
$PASSWORD_AGENT_OPTIONS before "--" and "$MANDOS_CLIENT_OPTIONS" to
end of line.
* dracut-module/module-setup.sh (install): Install all files named
/etc/systemd/system/ask-password-mandos.service.d/*.conf if any
exists. Also add --dh-params before $MANDOS_CLIENT_OPTIONS instead
of at end of line.
If a user uses dracut with systemd and wishes to modify the options
passed to password-agent(8mandos) or mandos-client(8mandos), they
should be able to do so by simply creating a file
/etc/systemd/system/ask-password-mandos.service.d/override.conf,
containing, for instance:
[Service]
Environment=MANDOS_CLIENT_OPTIONS=--debug
Adding PASSWORD_AGENT_OPTIONS should also be possible (but should not
normally be needed).
* dracut-module/ask-password-mandos.service ([Service]/ExecStart): Add
$PASSWORD_AGENT_OPTIONS before "--" and "$MANDOS_CLIENT_OPTIONS" to
end of line.
* dracut-module/module-setup.sh (install): Install all files named
/etc/systemd/system/ask-password-mandos.service.d/*.conf if any
exists. Also add --dh-params before $MANDOS_CLIENT_OPTIONS instead
of at end of line.
- files added:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- debian/tests
- debian/upstream
- dracut-module
- network-hooks.d
- plugin-helpers
- files removed:
- initramfs-tools-hook-conf
- files renamed:
- plugins.d/password-request.c => plugins.d/mandos-client.c
- plugins.d/password-request.xml => plugins.d/mandos-client.xml
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.xml
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<?xml version="1.0" encoding="UTF-8"?>
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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 "password-request">
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<!ENTITY TIMESTAMP "2008-09-04">
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<!ENTITY COMMANDNAME "mandos-client">
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<!ENTITY TIMESTAMP "2019-07-24">
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<!ENTITY % common SYSTEM "../common.ent">
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%common;
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]>
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<refentry xmlns:xi="http://www.w3.org/2001/XInclude">
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<refentryinfo>
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<title>Mandos Manual</title>
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<!-- Nwalsh’s docbook scripts use this to generate the footer: -->
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<!-- NWalsh’s docbook scripts use this to generate the footer: -->
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<productname>Mandos</productname>
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<productnumber>&VERSION;</productnumber>
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<productnumber>&version;</productnumber>
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<date>&TIMESTAMP;</date>
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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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<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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<xi:include href="../legalnotice.xml"/>
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</refentryinfo>
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<refmeta>
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<refentrytitle>&COMMANDNAME;</refentrytitle>
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<manvolnum>8mandos</manvolnum>
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<refnamediv>
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<refname><command>&COMMANDNAME;</command></refname>
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<refpurpose>
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Client for mandos
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Client for <application>Mandos</application>
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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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><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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</group>
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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 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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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>.
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</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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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--seckey=<replaceable
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>FILE</replaceable></option></term>
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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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xpointer="priority"/>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--dh-bits=<replaceable
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>BITS</replaceable></option></term>
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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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</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>--version</option></term>
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<term><option>-V</option></term>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsect1 id="overview">
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<title>OVERVIEW</title>
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<xi:include href="../overview.xml"/>
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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 (<citerefentry>
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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>) does that, which
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will be run in parallel to this one by the plugin runner.
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<manvolnum>8mandos</manvolnum></citerefentry>) will prompt for
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passwords on the system console.
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</para>
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</refsect1>
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510
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
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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.
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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
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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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</refsect1>
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<refsect1 id="file">
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<refsect1 id="network-hooks">
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<title>NETWORK HOOKS</title>
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<para>
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If a network interface like a bridge or tunnel is required to
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find a Mandos server, this requires the interface to be up and
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running before <command>&COMMANDNAME;</command> starts looking
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for Mandos servers. This can be accomplished by creating a
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<quote>network hook</quote> program, and placing it in a special
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directory.
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</para>
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<para>
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Before the network is used (and again before program exit), any
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runnable programs found in the network hook directory are run
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with the argument <quote><literal>start</literal></quote> or
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<quote><literal>stop</literal></quote>. This should bring up or
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down, respectively, any network interface which
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<command>&COMMANDNAME;</command> should use.
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</para>
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<refsect2 id="hook-requirements">
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<title>REQUIREMENTS</title>
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<para>
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A network hook must be an executable file, and its name must
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consist entirely of upper and lower case letters, digits,
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underscores, periods, and hyphens.
566
</para>
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<para>
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A network hook will receive one argument, which can be one of
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the following:
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</para>
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<variablelist>
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<varlistentry>
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<term><literal>start</literal></term>
574
<listitem>
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<para>
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This should make the network hook create (if necessary)
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and bring up a network interface.
578
</para>
579
</listitem>
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</varlistentry>
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<varlistentry>
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<term><literal>stop</literal></term>
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<listitem>
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<para>
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This should make the network hook take down a network
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interface, and delete it if it did not exist previously.
587
</para>
588
</listitem>
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</varlistentry>
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<varlistentry>
591
<term><literal>files</literal></term>
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<listitem>
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<para>
594
This should make the network hook print, <emphasis>one
595
file per line</emphasis>, all the files needed for it to
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run. (These files will be copied into the initial RAM
597
filesystem.) Typical use is for a network hook which is
598
a shell script to print its needed binaries.
599
</para>
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<para>
601
It is not necessary to print any non-executable files
602
already in the network hook directory, these will be
603
copied implicitly if they otherwise satisfy the name
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requirements.
605
</para>
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</listitem>
607
</varlistentry>
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<varlistentry>
609
<term><literal>modules</literal></term>
610
<listitem>
611
<para>
612
This should make the network hook print, <emphasis>on
613
separate lines</emphasis>, all the kernel modules needed
614
for it to run. (These modules will be copied into the
615
initial RAM filesystem.) For instance, a tunnel
616
interface needs the
617
<quote><literal>tun</literal></quote> module.
618
</para>
619
</listitem>
620
</varlistentry>
621
</variablelist>
622
<para>
623
The network hook will be provided with a number of environment
624
variables:
625
</para>
626
<variablelist>
627
<varlistentry>
628
<term><envar>MANDOSNETHOOKDIR</envar></term>
629
<listitem>
630
<para>
631
The network hook directory, specified to
632
<command>&COMMANDNAME;</command> by the
633
<option>--network-hook-dir</option> option. Note: this
634
should <emphasis>always</emphasis> be used by the
635
network hook to refer to itself or any files in the hook
636
directory it may require.
637
</para>
638
</listitem>
639
</varlistentry>
640
<varlistentry>
641
<term><envar>DEVICE</envar></term>
642
<listitem>
643
<para>
644
The network interfaces, as specified to
645
<command>&COMMANDNAME;</command> by the
646
<option>--interface</option> option, combined to one
647
string and separated by commas. If this is set, and
648
does not contain the interface a hook will bring up,
649
there is no reason for a hook to continue.
650
</para>
651
</listitem>
652
</varlistentry>
653
<varlistentry>
654
<term><envar>MODE</envar></term>
655
<listitem>
656
<para>
657
This will be the same as the first argument;
658
i.e. <quote><literal>start</literal></quote>,
659
<quote><literal>stop</literal></quote>,
660
<quote><literal>files</literal></quote>, or
661
<quote><literal>modules</literal></quote>.
662
</para>
663
</listitem>
664
</varlistentry>
665
<varlistentry>
666
<term><envar>VERBOSITY</envar></term>
667
<listitem>
668
<para>
669
This will be the <quote><literal>1</literal></quote> if
670
the <option>--debug</option> option is passed to
671
<command>&COMMANDNAME;</command>, otherwise
672
<quote><literal>0</literal></quote>.
673
</para>
674
</listitem>
675
</varlistentry>
676
<varlistentry>
677
<term><envar>DELAY</envar></term>
678
<listitem>
679
<para>
680
This will be the same as the <option>--delay</option>
681
option passed to <command>&COMMANDNAME;</command>. Is
682
only set if <envar>MODE</envar> is
683
<quote><literal>start</literal></quote> or
684
<quote><literal>stop</literal></quote>.
685
</para>
686
</listitem>
687
</varlistentry>
688
<varlistentry>
689
<term><envar>CONNECT</envar></term>
690
<listitem>
691
<para>
692
This will be the same as the <option>--connect</option>
693
option passed to <command>&COMMANDNAME;</command>. Is
694
only set if <option>--connect</option> is passed and
695
<envar>MODE</envar> is
696
<quote><literal>start</literal></quote> or
697
<quote><literal>stop</literal></quote>.
698
</para>
699
</listitem>
700
</varlistentry>
701
</variablelist>
702
<para>
703
A hook may not read from standard input, and should be
704
restrictive in printing to standard output or standard error
705
unless <varname>VERBOSITY</varname> is
706
<quote><literal>1</literal></quote>.
707
</para>
708
</refsect2>
709
</refsect1>
710
711
<refsect1 id="files">
345
712
<title>FILES</title>
346
713
<variablelist>
347
714
<varlistentry>
358
725
</para>
359
726
</listitem>
360
727
</varlistentry>
728
<varlistentry>
729
<term><filename>/conf/conf.d/mandos/tls-pubkey.pem</filename
730
></term>
731
<term><filename>/conf/conf.d/mandos/tls-privkey.pem</filename
732
></term>
733
<listitem>
734
<para>
735
Public and private raw key files, in <quote>PEM</quote>
736
format. These are the default file names, they can be
737
changed with the <option>--tls-pubkey</option> and
738
<option>--tls-privkey</option> options.
739
</para>
740
</listitem>
741
</varlistentry>
742
<varlistentry>
743
<term><filename
744
class="directory">/lib/mandos/network-hooks.d</filename></term>
745
<listitem>
746
<para>
747
Directory where network hooks are located. Change this
748
with the <option>--network-hook-dir</option> option. See
749
<xref linkend="network-hooks"/>.
750
</para>
751
</listitem>
752
</varlistentry>
361
753
</variablelist>
362
754
</refsect1>
363
755
364
<!-- <refsect1 id="bugs"> -->
365
<!-- <title>BUGS</title> -->
366
<!-- <para> -->
367
<!-- </para> -->
368
<!-- </refsect1> -->
369
756
<refsect1 id="bugs">
757
<title>BUGS</title>
758
<xi:include href="../bugs.xml"/>
759
</refsect1>
760
370
761
<refsect1 id="example">
371
762
<title>EXAMPLE</title>
372
763
<para>
377
768
</para>
378
769
<informalexample>
379
770
<para>
380
Normal invocation needs no options, if the network interface
381
is <quote>eth0</quote>:
771
Normal invocation needs no options, if the network interfaces
772
can be automatically determined:
382
773
</para>
383
774
<para>
384
775
<userinput>&COMMANDNAME;</userinput>
386
777
</informalexample>
387
778
<informalexample>
388
779
<para>
389
Search for Mandos servers (and connect to them) using another
390
interface:
780
Search for Mandos servers (and connect to them) using one
781
specific interface:
391
782
</para>
392
783
<para>
393
784
<!-- do not wrap this line -->
396
787
</informalexample>
397
788
<informalexample>
398
789
<para>
399
Run in debug mode, and use a custom key:
790
Run in debug mode, and use custom keys:
400
791
</para>
401
792
<para>
402
793
403
794
<!-- do not wrap this line -->
404
<userinput>&COMMANDNAME; --debug --pubkey keydir/pubkey.txt --seckey keydir/seckey.txt</userinput>
795
<userinput>&COMMANDNAME; --debug --pubkey keydir/pubkey.txt --seckey keydir/seckey.txt --tls-pubkey keydir/tls-pubkey.pem --tls-privkey keydir/tls-privkey.pem</userinput>
405
796
406
797
</para>
407
798
</informalexample>
408
799
<informalexample>
409
800
<para>
410
Run in debug mode, with a custom key, and do not use Zeroconf
411
to locate a server; connect directly to the IPv6 address
412
<quote><systemitem class="ipaddress"
413
>2001:db8:f983:bd0b:30de:ae4a:71f2:f672</systemitem></quote>,
414
port 4711, using interface eth2:
801
Run in debug mode, with custom keys, and do not use Zeroconf
802
to locate a server; connect directly to the IPv6 link-local
803
address <quote><systemitem class="ipaddress"
804
>fe80::aede:48ff:fe71:f6f2</systemitem></quote>, port 4711,
805
using interface eth2:
415
806
</para>
416
807
<para>
417
808
418
809
<!-- do not wrap this line -->
419
<userinput>&COMMANDNAME; --debug --pubkey keydir/pubkey.txt --seckey keydir/seckey.txt --connect 2001:db8:f983:bd0b:30de:ae4a:71f2:f672:4711 --interface eth2</userinput>
810
<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>
420
811
421
812
</para>
422
813
</informalexample>
423
814
</refsect1>
424
815
425
816
<refsect1 id="security">
426
817
<title>SECURITY</title>
427
818
<para>
428
This program is set-uid to root, but will switch back to the
429
original (and presumably non-privileged) user and group after
430
bringing up the network interface.
819
This program assumes that it is set-uid to root, and will switch
820
back to the original (and presumably non-privileged) user and
821
group after bringing up the network interface.
431
822
</para>
432
823
<para>
433
824
To use this program for its intended purpose (see <xref
446
837
<para>
447
838
The only remaining weak point is that someone with physical
448
839
access to the client hard drive might turn off the client
449
computer, read the OpenPGP keys directly from the hard drive,
450
and communicate with the server. The defense against this is
451
that the server is supposed to notice the client disappearing
452
and will stop giving out the encrypted data. Therefore, it is
840
computer, read the OpenPGP and TLS keys directly from the hard
841
drive, and communicate with the server. To safeguard against
842
this, the server is supposed to notice the client disappearing
843
and stop giving out the encrypted data. Therefore, it is
453
844
important to set the timeout and checker interval values tightly
454
845
on the server. See <citerefentry><refentrytitle
455
846
>mandos</refentrytitle><manvolnum>8</manvolnum></citerefentry>.
457
848
<para>
458
849
It will also help if the checker program on the server is
459
850
configured to request something from the client which can not be
460
spoofed by someone else on the network, unlike unencrypted
461
<acronym>ICMP</acronym> echo (<quote>ping</quote>) replies.
851
spoofed by someone else on the network, like SSH server key
852
fingerprints, and unlike unencrypted <acronym>ICMP</acronym>
853
echo (<quote>ping</quote>) replies.
462
854
</para>
463
855
<para>
464
856
<emphasis>Note</emphasis>: This makes it completely insecure to
468
860
confidential.
469
861
</para>
470
862
</refsect1>
471
863
472
864
<refsect1 id="see_also">
473
865
<title>SEE ALSO</title>
474
866
<para>
867
<citerefentry><refentrytitle>intro</refentrytitle>
868
<manvolnum>8mandos</manvolnum></citerefentry>,
475
869
<citerefentry><refentrytitle>cryptsetup</refentrytitle>
476
870
<manvolnum>8</manvolnum></citerefentry>,
477
871
<citerefentry><refentrytitle>crypttab</refentrytitle>
497
891
</varlistentry>
498
892
<varlistentry>
499
893
<term>
500
<ulink url="http://www.avahi.org/">Avahi</ulink>
894
<ulink url="https://www.avahi.org/">Avahi</ulink>
501
895
</term>
502
896
<listitem>
503
897
<para>
508
902
</varlistentry>
509
903
<varlistentry>
510
904
<term>
511
<ulink url="http://www.gnu.org/software/gnutls/"
512
>GnuTLS</ulink>
905
<ulink url="https://www.gnutls.org/">GnuTLS</ulink>
513
906
</term>
514
907
<listitem>
515
908
<para>
516
909
GnuTLS is the library this client uses to implement TLS for
517
910
communicating securely with the server, and at the same time
518
send the public OpenPGP key to the server.
911
send the public key to the server.
519
912
</para>
520
913
</listitem>
521
914
</varlistentry>
522
915
<varlistentry>
523
916
<term>
524
<ulink url="http://www.gnupg.org/related_software/gpgme/"
917
<ulink url="https://www.gnupg.org/related_software/gpgme/"
525
918
>GPGME</ulink>
526
919
</term>
527
920
<listitem>
555
948
<para>
556
949
This client uses IPv6 link-local addresses, which are
557
950
immediately usable since a link-local addresses is
558
automatically assigned to a network interfaces when it
951
automatically assigned to a network interface when it
559
952
is brought up.
560
953
</para>
561
954
</listitem>
565
958
</varlistentry>
566
959
<varlistentry>
567
960
<term>
568
RFC 4346: <citetitle>The Transport Layer Security (TLS)
569
Protocol Version 1.1</citetitle>
961
RFC 5246: <citetitle>The Transport Layer Security (TLS)
962
Protocol Version 1.2</citetitle>
570
963
</term>
571
964
<listitem>
572
965
<para>
573
TLS 1.1 is the protocol implemented by GnuTLS.
966
TLS 1.2 is the protocol implemented by GnuTLS.
574
967
</para>
575
968
</listitem>
576
969
</varlistentry>
587
980
</varlistentry>
588
981
<varlistentry>
589
982
<term>
590
RFC 5081: <citetitle>Using OpenPGP Keys for Transport Layer
983
RFC 7250: <citetitle>Using Raw Public Keys in Transport
984
Layer Security (TLS) and Datagram Transport Layer Security
985
(DTLS)</citetitle>
986
</term>
987
<listitem>
988
<para>
989
This is implemented by GnuTLS in version 3.6.6 and is, if
990
present, used by this program so that raw public keys can be
991
used.
992
</para>
993
</listitem>
994
</varlistentry>
995
<varlistentry>
996
<term>
997
RFC 6091: <citetitle>Using OpenPGP Keys for Transport Layer
591
998
Security</citetitle>
592
999
</term>
593
1000
<listitem>
594
1001
<para>
595
This is implemented by GnuTLS and used by this program so
596
that OpenPGP keys can be used.
1002
This is implemented by GnuTLS before version 3.6.0 and is,
1003
if present, used by this program so that OpenPGP keys can be
1004
used.
597
1005
</para>
598
1006
</listitem>
599
1007
</varlistentry>
600
1008
</variablelist>
601
1009
</refsect1>
602
603
1010
</refentry>
1011
604
1012
<!-- Local Variables: -->
605
1013
<!-- time-stamp-start: "<!ENTITY TIMESTAMP [\"']" -->
606
1014
<!-- time-stamp-end: "[\"']>" -->
Loggerhead is a web-based interface for Breezy
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