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- Committer: Teddy Hogeborn
- Date: 2019-02-09 23:23:26 UTC
- Revision ID: teddy@recompile.se-20190209232326-z1z2kzpgfixz7iaj
Add support for using raw public keys in TLS (RFC 7250)
Since GnuTLS removed support for OpenPGP keys in TLS (RFC 6091), and
no other library supports it, we have to change the protocol to use
something else. We choose to use "raw public keys" (RFC 7250). Since
we still use OpenPGP keys to decrypt the secret password, this means
that each client will have two keys: One OpenPGP key and one TLS
public/private key, and the key ID of the latter key is used to
identify clients instead of the fingerprint of the OpenPGP key.
Note that this code is still compatible with GnuTLS before version
3.6.0 (when OpenPGP key support was removed). This commit merely adds
support for using raw pulic keys instead with GnuTLS 3.6.6. or later.
* DBUS-API (Signals/ClientNotFound): Change name of first parameter
from "Fingerprint" to "KeyID".
(Mandos Client Interface/Properties/KeyID): New.
* INSTALL: Document conflict with GnuTLS 3.6.0 (which removed OpenPGP
key support) up until 3.6.6, when support for raw public
keys was added. Also document new dependency of client on
"gnutls-bin" package (for certtool).
* Makefile (run-client): Depend on TLS key files, and also pass them
as arguments to client.
(keydir/tls-privkey.pem, keydir/tls-pubkey.pem): New.
(confdir/clients.conf): Add dependency on TLS public key.
(purge-client): Add removal of TLS key files.
* clients.conf ([foo]/key_id, [bar]/key_id): New.
* debian/control (Source: mandos/Build-Depends): Also allow
libgnutls30 (>= 3.6.6)
(Package: mandos/Depends): - '' -
(Package: mandos/Description): Alter description to match new
design.
(Package: mandos-client/Description): - '' -
(Package: mandos-client/Depends): Move "gnutls-bin | openssl" to
here from "Recommends".
* debian/mandos-client.README.Debian: Add --tls-privkey and
--tls-pubkey options to test
command.
* debian/mandos-client.postinst (create_key): Renamed to "create_keys"
(all callers changed),
and also create TLS key.
* debian/mandos-client.postrm (purge): Also remove TLS key files.
* intro.xml (DESCRIPTION): Describe new dual-key design.
* mandos (GnuTLS): Define different functions depending on whether
support for raw public keys is detected.
(Client.key_id): New attribute.
(ClientDBus.KeyID_dbus_property): New method.
(ProxyClient.__init__): Take new "key_id" parameter.
(ClientHandler.handle): Use key IDs when using raw public keys and
use fingerprints when using OpenPGP keys.
(ClientHandler.peer_certificate): Also handle raw public keys.
(ClientHandler.key_id): New.
(MandosServer.handle_ipc): Pass key ID over the pipe IPC. Also
check for key ID matches when looking up
clients.
(main): Default GnuTLS priority string depends on whether we are
using raw public keys or not. When unpickling clients, set
key_id if not set in the pickle.
(main/MandosDBusService.ClientNotFound): Change name of first
parameter from
"Fingerprint" to "KeyID".
* mandos-clients.conf.xml (OPTIONS): Document new "key_id" option.
(OPTIONS/secret): Mention new key ID matchning.
(EXPANSION/RUNTIME EXPANSION): Add new "key_id" option.
(EXAMPLE): - '' -
* mandos-ctl (tablewords, main/keywords): Add new "KeyID" property.
* mandos-keygen: Create TLS key files. New "--tls-keytype" (-T)
option. Alter help text to be more clear about key
types. When in password mode, also output "key_id"
option.
* mandos-keygen.xml (SYNOPSIS): Add new "--tls-keytype" (-T) option.
(DESCRIPTION): Alter to match new dual-key design.
(OVERVIEW): - '' -
(FILES): Add TLS key files.
* mandos-options.xml (priority): Document new default priority string
when using raw public keys.
* mandos.xml (NETWORK PROTOCOL): Describe new protocol using key ID.
(BUGS): Remove issue about checking expire times of OpenPGP keys,
since TLS public keys do not have expiration times.
(SECURITY/CLIENT): Alter description to match new design.
(SEE ALSO/GnuTLS): - '' -
(SEE ALSO): Add reference to RFC 7250, and alter description of when
RFC 6091 is used.
* overview.xml: Alter text to match new design.
* plugin-runner.xml (EXAMPLE): Add --tls-pubkey and --tls-privkey
options to mandos-client options.
* plugins.d/mandos-client.c: Use raw public keys when compiling with
supporting GnuTLS versions. Add new
"--tls-pubkey" and "--tls-privkey"
options (which do nothing if GnuTLS
library does not support raw public
keys). Alter text throughout to reflect
new design. Only generate new DH
parameters (based on size of OpenPGP key)
when using OpenPGP in TLS. Default
GnuTLS priority string depends on whether
we are using raw public keys or not.
* plugins.d/mandos-client.xml (SYNOPSIS): Add new "--tls-privkey" (-t)
and "--tls-pubkey" (-T)
options.
(DESCRIPTION): Describe new dual-key design.
(OPTIONS): Document new "--tls-privkey" (-t) and "--tls-pubkey" (-T)
options.
(OPTIONS/--dh-bits): No longer necessarily depends on OpenPGP key
size.
(FILES): Add default locations for TLS public and private key files.
(EXAMPLE): Use new --tls-pubkey and --tls-privkey options.
(SECURITY): Alter wording slightly to reflect new dual-key design.
(SEE ALSO/GnuTLS): Alter description to match new design.
(SEE ALSO): Add reference to RFC 7250, and alter description of when
RFC 6091 is used.
Since GnuTLS removed support for OpenPGP keys in TLS (RFC 6091), and
no other library supports it, we have to change the protocol to use
something else. We choose to use "raw public keys" (RFC 7250). Since
we still use OpenPGP keys to decrypt the secret password, this means
that each client will have two keys: One OpenPGP key and one TLS
public/private key, and the key ID of the latter key is used to
identify clients instead of the fingerprint of the OpenPGP key.
Note that this code is still compatible with GnuTLS before version
3.6.0 (when OpenPGP key support was removed). This commit merely adds
support for using raw pulic keys instead with GnuTLS 3.6.6. or later.
* DBUS-API (Signals/ClientNotFound): Change name of first parameter
from "Fingerprint" to "KeyID".
(Mandos Client Interface/Properties/KeyID): New.
* INSTALL: Document conflict with GnuTLS 3.6.0 (which removed OpenPGP
key support) up until 3.6.6, when support for raw public
keys was added. Also document new dependency of client on
"gnutls-bin" package (for certtool).
* Makefile (run-client): Depend on TLS key files, and also pass them
as arguments to client.
(keydir/tls-privkey.pem, keydir/tls-pubkey.pem): New.
(confdir/clients.conf): Add dependency on TLS public key.
(purge-client): Add removal of TLS key files.
* clients.conf ([foo]/key_id, [bar]/key_id): New.
* debian/control (Source: mandos/Build-Depends): Also allow
libgnutls30 (>= 3.6.6)
(Package: mandos/Depends): - '' -
(Package: mandos/Description): Alter description to match new
design.
(Package: mandos-client/Description): - '' -
(Package: mandos-client/Depends): Move "gnutls-bin | openssl" to
here from "Recommends".
* debian/mandos-client.README.Debian: Add --tls-privkey and
--tls-pubkey options to test
command.
* debian/mandos-client.postinst (create_key): Renamed to "create_keys"
(all callers changed),
and also create TLS key.
* debian/mandos-client.postrm (purge): Also remove TLS key files.
* intro.xml (DESCRIPTION): Describe new dual-key design.
* mandos (GnuTLS): Define different functions depending on whether
support for raw public keys is detected.
(Client.key_id): New attribute.
(ClientDBus.KeyID_dbus_property): New method.
(ProxyClient.__init__): Take new "key_id" parameter.
(ClientHandler.handle): Use key IDs when using raw public keys and
use fingerprints when using OpenPGP keys.
(ClientHandler.peer_certificate): Also handle raw public keys.
(ClientHandler.key_id): New.
(MandosServer.handle_ipc): Pass key ID over the pipe IPC. Also
check for key ID matches when looking up
clients.
(main): Default GnuTLS priority string depends on whether we are
using raw public keys or not. When unpickling clients, set
key_id if not set in the pickle.
(main/MandosDBusService.ClientNotFound): Change name of first
parameter from
"Fingerprint" to "KeyID".
* mandos-clients.conf.xml (OPTIONS): Document new "key_id" option.
(OPTIONS/secret): Mention new key ID matchning.
(EXPANSION/RUNTIME EXPANSION): Add new "key_id" option.
(EXAMPLE): - '' -
* mandos-ctl (tablewords, main/keywords): Add new "KeyID" property.
* mandos-keygen: Create TLS key files. New "--tls-keytype" (-T)
option. Alter help text to be more clear about key
types. When in password mode, also output "key_id"
option.
* mandos-keygen.xml (SYNOPSIS): Add new "--tls-keytype" (-T) option.
(DESCRIPTION): Alter to match new dual-key design.
(OVERVIEW): - '' -
(FILES): Add TLS key files.
* mandos-options.xml (priority): Document new default priority string
when using raw public keys.
* mandos.xml (NETWORK PROTOCOL): Describe new protocol using key ID.
(BUGS): Remove issue about checking expire times of OpenPGP keys,
since TLS public keys do not have expiration times.
(SECURITY/CLIENT): Alter description to match new design.
(SEE ALSO/GnuTLS): - '' -
(SEE ALSO): Add reference to RFC 7250, and alter description of when
RFC 6091 is used.
* overview.xml: Alter text to match new design.
* plugin-runner.xml (EXAMPLE): Add --tls-pubkey and --tls-privkey
options to mandos-client options.
* plugins.d/mandos-client.c: Use raw public keys when compiling with
supporting GnuTLS versions. Add new
"--tls-pubkey" and "--tls-privkey"
options (which do nothing if GnuTLS
library does not support raw public
keys). Alter text throughout to reflect
new design. Only generate new DH
parameters (based on size of OpenPGP key)
when using OpenPGP in TLS. Default
GnuTLS priority string depends on whether
we are using raw public keys or not.
* plugins.d/mandos-client.xml (SYNOPSIS): Add new "--tls-privkey" (-t)
and "--tls-pubkey" (-T)
options.
(DESCRIPTION): Describe new dual-key design.
(OPTIONS): Document new "--tls-privkey" (-t) and "--tls-pubkey" (-T)
options.
(OPTIONS/--dh-bits): No longer necessarily depends on OpenPGP key
size.
(FILES): Add default locations for TLS public and private key files.
(EXAMPLE): Use new --tls-pubkey and --tls-privkey options.
(SECURITY): Alter wording slightly to reflect new dual-key design.
(SEE ALSO/GnuTLS): Alter description to match new design.
(SEE ALSO): Add reference to RFC 7250, and alter description of when
RFC 6091 is used.
- files added:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- debian/upstream
- 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:
- Makefile
added
removed
plugins.d/mandos-client.xml
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<?xml version='1.0' encoding='UTF-8'?>
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<?xml-stylesheet type="text/xsl"
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href="http://docbook.sourceforge.net/release/xsl/current/manpages/docbook.xsl"?>
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<?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 COMMANDNAME "mandos-client">
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<!ENTITY TIMESTAMP "2019-02-09">
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<!ENTITY % common SYSTEM "../common.ent">
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%common;
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]>
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<refentry>
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<refentry xmlns:xi="http://www.w3.org/2001/XInclude">
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<refentryinfo>
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<title>&COMMANDNAME;</title>
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<!-- NWalsh's docbook scripts use this to generate the footer: -->
14
<productname>&COMMANDNAME;</productname>
15
<productnumber>&VERSION;</productnumber>
12
<title>Mandos Manual</title>
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<!-- NWalsh’s docbook scripts use this to generate the footer: -->
14
<productname>Mandos</productname>
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<productnumber>&version;</productnumber>
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<date>&TIMESTAMP;</date>
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<authorgroup>
17
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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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<holder>Teddy Hogeborn & Björn Påhlsson</holder>
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<year>2009</year>
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<year>2010</year>
37
<year>2011</year>
38
<year>2012</year>
39
<year>2013</year>
40
<year>2014</year>
41
<year>2015</year>
42
<year>2016</year>
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<year>2017</year>
44
<year>2018</year>
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<holder>Teddy Hogeborn</holder>
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<holder>Björn Påhlsson</holder>
35
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</copyright>
36
<legalnotice>
37
<para>
38
This manual page is free software: you can redistribute it
39
and/or modify it under the terms of the GNU General Public
40
License as published by the Free Software Foundation,
41
either version 3 of the License, or (at your option) any
42
later version.
43
</para>
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<para>
46
This manual page is distributed in the hope that it will
47
be useful, but WITHOUT ANY WARRANTY; without even the
48
implied warranty of MERCHANTABILITY or FITNESS FOR A
49
PARTICULAR PURPOSE. See the GNU General Public License
50
for more details.
51
</para>
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53
<para>
54
You should have received a copy of the GNU General Public
55
License along with this program; If not, see
56
<ulink url="http://www.gnu.org/licenses/"/>.
57
</para>
58
</legalnotice>
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<xi:include href="../legalnotice.xml"/>
59
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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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<arg choice='opt'>--connect<arg choice='plain'>IP</arg></arg>
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<arg choice='opt'>--keydir<arg choice='plain'>KEYDIR</arg></arg>
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<arg choice='opt'>--interface<arg choice='plain'>INTERFACE</arg></arg>
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<arg choice='opt'>--pubkey<arg choice='plain'>PUBKEY</arg></arg>
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<arg choice='opt'>--seckey<arg choice='plain'>SECKEY</arg></arg>
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<arg choice='opt'>--priority<arg choice='plain'>PRIORITY</arg></arg>
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<arg choice='opt'>--dh-bits<arg choice='plain'>BITS</arg></arg>
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<arg choice='opt'>--debug</arg>
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</cmdsynopsis>
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<cmdsynopsis>
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<command>&COMMANDNAME;</command>
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<arg choice='plain'>--help</arg>
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</cmdsynopsis>
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<cmdsynopsis>
90
<command>&COMMANDNAME;</command>
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<arg choice='plain'>--usage</arg>
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</cmdsynopsis>
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<cmdsynopsis>
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<command>&COMMANDNAME;</command>
95
<arg choice='plain'>--version</arg>
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</cmdsynopsis>
66
<group>
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<arg choice="plain"><option>--connect
68
<replaceable>ADDRESS</replaceable><literal>:</literal
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><replaceable>PORT</replaceable></option></arg>
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<arg choice="plain"><option>-c
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<replaceable>ADDRESS</replaceable><literal>:</literal
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><replaceable>PORT</replaceable></option></arg>
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</group>
74
<sbr/>
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<group rep='repeat'>
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<arg choice="plain"><option>--interface
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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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<arg choice="plain"><option>--pubkey
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<replaceable>FILE</replaceable></option></arg>
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<arg choice="plain"><option>-p
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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>--seckey
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<replaceable>FILE</replaceable></option></arg>
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<arg choice="plain"><option>-s
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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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<sbr/>
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<arg>
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<option>--dh-bits <replaceable>BITS</replaceable></option>
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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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<cmdsynopsis>
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<command>&COMMANDNAME;</command>
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<group choice="req">
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<arg choice="plain"><option>--help</option></arg>
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<arg choice="plain"><option>-?</option></arg>
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</group>
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</cmdsynopsis>
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<cmdsynopsis>
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<command>&COMMANDNAME;</command>
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<arg choice="plain"><option>--usage</option></arg>
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</cmdsynopsis>
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<cmdsynopsis>
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<command>&COMMANDNAME;</command>
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<group choice="req">
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<arg choice="plain"><option>--version</option></arg>
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<arg choice="plain"><option>-V</option></arg>
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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 mandos plugin that works
103
like a client program that through avahi detects mandos servers,
104
sets up a gnutls connect and request a encrypted password. Any
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passwords given is automaticly decrypted and passed to
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cryptsetup.
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</para>
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</refsect1>
164
<command>&COMMANDNAME;</command> is a client program that
165
communicates with <citerefentry><refentrytitle
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>mandos</refentrytitle><manvolnum>8</manvolnum></citerefentry>
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to get a password. In slightly more detail, this client program
168
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
172
and confidentiality. This client program keeps running, trying
173
all servers on the network, until it receives a satisfactory
174
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.
177
</para>
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<para>
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The network interfaces are selected like this: If any interfaces
180
are specified using the <option>--interface</option> option,
181
those interface are used. Otherwise,
182
<command>&COMMANDNAME;</command> will use all interfaces that
183
are not loopback interfaces, are not point-to-point interfaces,
184
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
187
<option>--connect</option> option is used, point-to-point
188
interfaces and non-broadcast interfaces are accepted.) If any
189
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
198
to run as a plugin of the <application>Mandos</application>
199
<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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</para>
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</refsect1>
207
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<refsect1 id="purpose">
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<title>PURPOSE</title>
210
<para>
211
The purpose of this is to enable <emphasis>remote and unattended
212
rebooting</emphasis> of client host computer with an
213
<emphasis>encrypted root file system</emphasis>. See <xref
214
linkend="overview"/> for details.
215
</para>
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</refsect1>
109
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<refsect1 id="options">
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<title>OPTIONS</title>
112
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<para>
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Commonly not invoked as command lines but from configuration
114
file of plugin runner.
221
This program is commonly not invoked from the command line; it
222
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
226
are therefore normally provided by the plugin runner, and not
227
directly.
115
228
</para>
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229
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<variablelist>
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<varlistentry>
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<term><literal>-c</literal>, <literal>--connect=<replaceable>
120
IP</replaceable></literal></term>
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<listitem>
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<para>
123
Connect directly to a specified mandos server
124
</para>
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</listitem>
126
</varlistentry>
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<varlistentry>
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<term><literal>-d</literal>, <literal>--keydir=<replaceable>
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KEYDIR</replaceable></literal></term>
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<listitem>
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<para>
133
Directory where the openpgp keyring is
134
</para>
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</listitem>
136
</varlistentry>
137
138
<varlistentry>
139
<term><literal>-i</literal>, <literal>--interface=
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<replaceable>INTERFACE</replaceable></literal></term>
141
<listitem>
142
<para>
143
Interface that Avahi will conntect through
144
</para>
145
</listitem>
146
</varlistentry>
147
148
<varlistentry>
149
<term><literal>-p</literal>, <literal>--pubkey=<replaceable>
150
PUBKEY</replaceable></literal></term>
151
<listitem>
152
<para>
153
Public openpgp key for gnutls authentication
154
</para>
155
</listitem>
156
</varlistentry>
157
158
<varlistentry>
159
<term><literal>-s</literal>, <literal>--seckey=<replaceable>
160
SECKEY</replaceable></literal></term>
161
<listitem>
162
<para>
163
Secret openpgp key for gnutls authentication
164
</para>
165
</listitem>
166
</varlistentry>
167
168
<varlistentry>
169
<term><literal>--priority=<replaceable>PRIORITY</replaceable>
170
</literal></term>
171
<listitem>
172
<para>
173
GNUTLS priority
174
</para>
175
</listitem>
176
</varlistentry>
177
178
<varlistentry>
179
<term><literal>--dh-bits=<replaceable>BITS</replaceable>
180
</literal></term>
181
<listitem>
182
<para>
183
dh-bits to use in gnutls communication
184
</para>
185
</listitem>
186
</varlistentry>
187
188
<varlistentry>
189
<term><literal>--debug</literal></term>
190
<listitem>
191
<para>
192
Debug mode
193
</para>
194
</listitem>
195
</varlistentry>
196
197
<varlistentry>
198
<term><literal>-?</literal>, <literal>--help</literal></term>
199
<listitem>
200
<para>
201
Gives a help message
202
</para>
203
</listitem>
204
</varlistentry>
205
206
<varlistentry>
207
<term><literal>--usage</literal></term>
208
<listitem>
209
<para>
210
Gives a short usage message
211
</para>
212
</listitem>
213
</varlistentry>
214
215
<varlistentry>
216
<term><literal>-V</literal>, <literal>--version</literal></term>
217
<listitem>
218
<para>
219
Prints the program version
220
</para>
221
</listitem>
222
</varlistentry>
232
<term><option>--connect=<replaceable
233
>ADDRESS</replaceable><literal>:</literal><replaceable
234
>PORT</replaceable></option></term>
235
<term><option>-c
236
<replaceable>ADDRESS</replaceable><literal>:</literal
237
><replaceable>PORT</replaceable></option></term>
238
<listitem>
239
<para>
240
Do not use Zeroconf to locate servers. Connect directly
241
to only one specified <application>Mandos</application>
242
server. Note that an IPv6 address has colon characters in
243
it, so the <emphasis>last</emphasis> colon character is
244
assumed to separate the address from the port number.
245
</para>
246
<para>
247
Normally, Zeroconf would be used to locate Mandos servers,
248
in which case this option would only be used when testing
249
and debugging.
250
</para>
251
</listitem>
252
</varlistentry>
253
254
<varlistentry>
255
<term><option>--interface=<replaceable
256
>NAME</replaceable><arg rep='repeat'>,<replaceable
257
>NAME</replaceable></arg></option></term>
258
<term><option>-i
259
<replaceable>NAME</replaceable><arg rep='repeat'>,<replaceable
260
>NAME</replaceable></arg></option></term>
261
<listitem>
262
<para>
263
Comma separated list of network interfaces that will be
264
brought up and scanned for Mandos servers to connect to.
265
The default is the empty string, which will automatically
266
use all appropriate interfaces.
267
</para>
268
<para>
269
If the <option>--connect</option> option is used, and
270
exactly one interface name is specified (except
271
<quote><literal>none</literal></quote>), this specifies
272
the interface to use to connect to the address given.
273
</para>
274
<para>
275
Note that since this program will normally run in the
276
initial RAM disk environment, the interface must be an
277
interface which exists at that stage. Thus, the interface
278
can normally not be a pseudo-interface such as
279
<quote>br0</quote> or <quote>tun0</quote>; such interfaces
280
will not exist until much later in the boot process, and
281
can not be used by this program, unless created by a
282
<quote>network hook</quote> — see <xref
283
linkend="network-hooks"/>.
284
</para>
285
<para>
286
<replaceable>NAME</replaceable> can be the string
287
<quote><literal>none</literal></quote>; this will make
288
<command>&COMMANDNAME;</command> only bring up interfaces
289
specified <emphasis>before</emphasis> this string. This
290
is not recommended, and only meant for advanced users.
291
</para>
292
</listitem>
293
</varlistentry>
294
295
<varlistentry>
296
<term><option>--pubkey=<replaceable
297
>FILE</replaceable></option></term>
298
<term><option>-p
299
<replaceable>FILE</replaceable></option></term>
300
<listitem>
301
<para>
302
OpenPGP public key file name. The default name is
303
<quote><filename>/conf/conf.d/mandos/pubkey.txt</filename
304
></quote>.
305
</para>
306
</listitem>
307
</varlistentry>
308
309
<varlistentry>
310
<term><option>--seckey=<replaceable
311
>FILE</replaceable></option></term>
312
<term><option>-s
313
<replaceable>FILE</replaceable></option></term>
314
<listitem>
315
<para>
316
OpenPGP secret key file name. The default name is
317
<quote><filename>/conf/conf.d/mandos/seckey.txt</filename
318
></quote>.
319
</para>
320
</listitem>
321
</varlistentry>
322
323
<varlistentry>
324
<term><option>--tls-pubkey=<replaceable
325
>FILE</replaceable></option></term>
326
<term><option>-T
327
<replaceable>FILE</replaceable></option></term>
328
<listitem>
329
<para>
330
TLS raw public key file name. The default name is
331
<quote><filename>/conf/conf.d/mandos/tls-pubkey.pem</filename
332
></quote>.
333
</para>
334
</listitem>
335
</varlistentry>
336
337
<varlistentry>
338
<term><option>--tls-privkey=<replaceable
339
>FILE</replaceable></option></term>
340
<term><option>-t
341
<replaceable>FILE</replaceable></option></term>
342
<listitem>
343
<para>
344
TLS secret key file name. The default name is
345
<quote><filename>/conf/conf.d/mandos/tls-privkey.pem</filename
346
></quote>.
347
</para>
348
</listitem>
349
</varlistentry>
350
351
<varlistentry>
352
<term><option>--priority=<replaceable
353
>STRING</replaceable></option></term>
354
<listitem>
355
<xi:include href="../mandos-options.xml"
356
xpointer="priority"/>
357
</listitem>
358
</varlistentry>
359
360
<varlistentry>
361
<term><option>--dh-bits=<replaceable
362
>BITS</replaceable></option></term>
363
<listitem>
364
<para>
365
Sets the number of bits to use for the prime number in the
366
TLS Diffie-Hellman key exchange. The default value is
367
selected automatically based on the GnuTLS security
368
profile set in its priority string. Note that if the
369
<option>--dh-params</option> option is used, the values
370
from that file will be used instead.
371
</para>
372
</listitem>
373
</varlistentry>
374
375
<varlistentry>
376
<term><option>--dh-params=<replaceable
377
>FILE</replaceable></option></term>
378
<listitem>
379
<para>
380
Specifies a PEM-encoded PKCS#3 file to read the parameters
381
needed by the TLS Diffie-Hellman key exchange from. If
382
this option is not given, or if the file for some reason
383
could not be used, the parameters will be generated on
384
startup, which will take some time and processing power.
385
Those using servers running under time, power or processor
386
constraints may want to generate such a file in advance
387
and use this option.
388
</para>
389
</listitem>
390
</varlistentry>
391
392
<varlistentry>
393
<term><option>--delay=<replaceable
394
>SECONDS</replaceable></option></term>
395
<listitem>
396
<para>
397
After bringing a network interface up, the program waits
398
for the interface to arrive in a <quote>running</quote>
399
state before proceeding. During this time, the kernel log
400
level will be lowered to reduce clutter on the system
401
console, alleviating any other plugins which might be
402
using the system console. This option sets the upper
403
limit of seconds to wait. The default is 2.5 seconds.
404
</para>
405
</listitem>
406
</varlistentry>
407
408
<varlistentry>
409
<term><option>--retry=<replaceable
410
>SECONDS</replaceable></option></term>
411
<listitem>
412
<para>
413
All Mandos servers are tried repeatedly until a password
414
is received. This value specifies, in seconds, how long
415
between each successive try <emphasis>for the same
416
server</emphasis>. The default is 10 seconds.
417
</para>
418
</listitem>
419
</varlistentry>
420
421
<varlistentry>
422
<term><option>--network-hook-dir=<replaceable
423
>DIR</replaceable></option></term>
424
<listitem>
425
<para>
426
Network hook directory. The default directory is
427
<quote><filename class="directory"
428
>/lib/mandos/network-hooks.d</filename></quote>.
429
</para>
430
</listitem>
431
</varlistentry>
432
433
<varlistentry>
434
<term><option>--debug</option></term>
435
<listitem>
436
<para>
437
Enable debug mode. This will enable a lot of output to
438
standard error about what the program is doing. The
439
program will still perform all other functions normally.
440
</para>
441
<para>
442
It will also enable debug mode in the Avahi and GnuTLS
443
libraries, making them print large amounts of debugging
444
output.
445
</para>
446
</listitem>
447
</varlistentry>
448
449
<varlistentry>
450
<term><option>--help</option></term>
451
<term><option>-?</option></term>
452
<listitem>
453
<para>
454
Gives a help message about options and their meanings.
455
</para>
456
</listitem>
457
</varlistentry>
458
459
<varlistentry>
460
<term><option>--usage</option></term>
461
<listitem>
462
<para>
463
Gives a short usage message.
464
</para>
465
</listitem>
466
</varlistentry>
467
468
<varlistentry>
469
<term><option>--version</option></term>
470
<term><option>-V</option></term>
471
<listitem>
472
<para>
473
Prints the program version.
474
</para>
475
</listitem>
476
</varlistentry>
223
477
</variablelist>
224
478
</refsect1>
225
479
480
<refsect1 id="overview">
481
<title>OVERVIEW</title>
482
<xi:include href="../overview.xml"/>
483
<para>
484
This program is the client part. It is a plugin started by
485
<citerefentry><refentrytitle>plugin-runner</refentrytitle>
486
<manvolnum>8mandos</manvolnum></citerefentry> which will run in
487
an initial <acronym>RAM</acronym> disk environment.
488
</para>
489
<para>
490
This program could, theoretically, be used as a keyscript in
491
<filename>/etc/crypttab</filename>, but it would then be
492
impossible to enter a password for the encrypted root disk at
493
the console, since this program does not read from the console
494
at all. This is why a separate plugin runner (<citerefentry>
495
<refentrytitle>plugin-runner</refentrytitle>
496
<manvolnum>8mandos</manvolnum></citerefentry>) is used to run
497
both this program and others in in parallel,
498
<emphasis>one</emphasis> of which (<citerefentry>
499
<refentrytitle>password-prompt</refentrytitle>
500
<manvolnum>8mandos</manvolnum></citerefentry>) will prompt for
501
passwords on the system console.
502
</para>
503
</refsect1>
504
226
505
<refsect1 id="exit_status">
227
506
<title>EXIT STATUS</title>
228
507
<para>
508
This program will exit with a successful (zero) exit status if a
509
server could be found and the password received from it could be
510
successfully decrypted and output on standard output. The
511
program will exit with a non-zero exit status only if a critical
512
error occurs. Otherwise, it will forever connect to any
513
discovered <application>Mandos</application> servers, trying to
514
get a decryptable password and print it.
229
515
</para>
230
516
</refsect1>
231
517
232
518
<refsect1 id="environment">
233
519
<title>ENVIRONMENT</title>
234
<para>
235
</para>
236
</refsect1>
237
238
<refsect1 id="file">
520
<variablelist>
521
<varlistentry>
522
<term><envar>MANDOSPLUGINHELPERDIR</envar></term>
523
<listitem>
524
<para>
525
This environment variable will be assumed to contain the
526
directory containing any helper executables. The use and
527
nature of these helper executables, if any, is
528
purposefully not documented.
529
</para>
530
</listitem>
531
</varlistentry>
532
</variablelist>
533
<para>
534
This program does not use any other environment variables, not
535
even the ones provided by <citerefentry><refentrytitle
536
>cryptsetup</refentrytitle><manvolnum>8</manvolnum>
537
</citerefentry>.
538
</para>
539
</refsect1>
540
541
<refsect1 id="network-hooks">
542
<title>NETWORK HOOKS</title>
543
<para>
544
If a network interface like a bridge or tunnel is required to
545
find a Mandos server, this requires the interface to be up and
546
running before <command>&COMMANDNAME;</command> starts looking
547
for Mandos servers. This can be accomplished by creating a
548
<quote>network hook</quote> program, and placing it in a special
549
directory.
550
</para>
551
<para>
552
Before the network is used (and again before program exit), any
553
runnable programs found in the network hook directory are run
554
with the argument <quote><literal>start</literal></quote> or
555
<quote><literal>stop</literal></quote>. This should bring up or
556
down, respectively, any network interface which
557
<command>&COMMANDNAME;</command> should use.
558
</para>
559
<refsect2 id="hook-requirements">
560
<title>REQUIREMENTS</title>
561
<para>
562
A network hook must be an executable file, and its name must
563
consist entirely of upper and lower case letters, digits,
564
underscores, periods, and hyphens.
565
</para>
566
<para>
567
A network hook will receive one argument, which can be one of
568
the following:
569
</para>
570
<variablelist>
571
<varlistentry>
572
<term><literal>start</literal></term>
573
<listitem>
574
<para>
575
This should make the network hook create (if necessary)
576
and bring up a network interface.
577
</para>
578
</listitem>
579
</varlistentry>
580
<varlistentry>
581
<term><literal>stop</literal></term>
582
<listitem>
583
<para>
584
This should make the network hook take down a network
585
interface, and delete it if it did not exist previously.
586
</para>
587
</listitem>
588
</varlistentry>
589
<varlistentry>
590
<term><literal>files</literal></term>
591
<listitem>
592
<para>
593
This should make the network hook print, <emphasis>one
594
file per line</emphasis>, all the files needed for it to
595
run. (These files will be copied into the initial RAM
596
filesystem.) Typical use is for a network hook which is
597
a shell script to print its needed binaries.
598
</para>
599
<para>
600
It is not necessary to print any non-executable files
601
already in the network hook directory, these will be
602
copied implicitly if they otherwise satisfy the name
603
requirements.
604
</para>
605
</listitem>
606
</varlistentry>
607
<varlistentry>
608
<term><literal>modules</literal></term>
609
<listitem>
610
<para>
611
This should make the network hook print, <emphasis>on
612
separate lines</emphasis>, all the kernel modules needed
613
for it to run. (These modules will be copied into the
614
initial RAM filesystem.) For instance, a tunnel
615
interface needs the
616
<quote><literal>tun</literal></quote> module.
617
</para>
618
</listitem>
619
</varlistentry>
620
</variablelist>
621
<para>
622
The network hook will be provided with a number of environment
623
variables:
624
</para>
625
<variablelist>
626
<varlistentry>
627
<term><envar>MANDOSNETHOOKDIR</envar></term>
628
<listitem>
629
<para>
630
The network hook directory, specified to
631
<command>&COMMANDNAME;</command> by the
632
<option>--network-hook-dir</option> option. Note: this
633
should <emphasis>always</emphasis> be used by the
634
network hook to refer to itself or any files in the hook
635
directory it may require.
636
</para>
637
</listitem>
638
</varlistentry>
639
<varlistentry>
640
<term><envar>DEVICE</envar></term>
641
<listitem>
642
<para>
643
The network interfaces, as specified to
644
<command>&COMMANDNAME;</command> by the
645
<option>--interface</option> option, combined to one
646
string and separated by commas. If this is set, and
647
does not contain the interface a hook will bring up,
648
there is no reason for a hook to continue.
649
</para>
650
</listitem>
651
</varlistentry>
652
<varlistentry>
653
<term><envar>MODE</envar></term>
654
<listitem>
655
<para>
656
This will be the same as the first argument;
657
i.e. <quote><literal>start</literal></quote>,
658
<quote><literal>stop</literal></quote>,
659
<quote><literal>files</literal></quote>, or
660
<quote><literal>modules</literal></quote>.
661
</para>
662
</listitem>
663
</varlistentry>
664
<varlistentry>
665
<term><envar>VERBOSITY</envar></term>
666
<listitem>
667
<para>
668
This will be the <quote><literal>1</literal></quote> if
669
the <option>--debug</option> option is passed to
670
<command>&COMMANDNAME;</command>, otherwise
671
<quote><literal>0</literal></quote>.
672
</para>
673
</listitem>
674
</varlistentry>
675
<varlistentry>
676
<term><envar>DELAY</envar></term>
677
<listitem>
678
<para>
679
This will be the same as the <option>--delay</option>
680
option passed to <command>&COMMANDNAME;</command>. Is
681
only set if <envar>MODE</envar> is
682
<quote><literal>start</literal></quote> or
683
<quote><literal>stop</literal></quote>.
684
</para>
685
</listitem>
686
</varlistentry>
687
<varlistentry>
688
<term><envar>CONNECT</envar></term>
689
<listitem>
690
<para>
691
This will be the same as the <option>--connect</option>
692
option passed to <command>&COMMANDNAME;</command>. Is
693
only set if <option>--connect</option> is passed and
694
<envar>MODE</envar> is
695
<quote><literal>start</literal></quote> or
696
<quote><literal>stop</literal></quote>.
697
</para>
698
</listitem>
699
</varlistentry>
700
</variablelist>
701
<para>
702
A hook may not read from standard input, and should be
703
restrictive in printing to standard output or standard error
704
unless <varname>VERBOSITY</varname> is
705
<quote><literal>1</literal></quote>.
706
</para>
707
</refsect2>
708
</refsect1>
709
710
<refsect1 id="files">
239
711
<title>FILES</title>
240
<para>
241
</para>
242
</refsect1>
712
<variablelist>
713
<varlistentry>
714
<term><filename>/conf/conf.d/mandos/pubkey.txt</filename
715
></term>
716
<term><filename>/conf/conf.d/mandos/seckey.txt</filename
717
></term>
718
<listitem>
719
<para>
720
OpenPGP public and private key files, in <quote>ASCII
721
Armor</quote> format. These are the default file names,
722
they can be changed with the <option>--pubkey</option> and
723
<option>--seckey</option> options.
724
</para>
725
</listitem>
726
</varlistentry>
727
<varlistentry>
728
<term><filename>/conf/conf.d/mandos/tls-pubkey.pem</filename
729
></term>
730
<term><filename>/conf/conf.d/mandos/tls-privkey.pem</filename
731
></term>
732
<listitem>
733
<para>
734
Public and private raw key files, in <quote>PEM</quote>
735
format. These are the default file names, they can be
736
changed with the <option>--tls-pubkey</option> and
737
<option>--tls-privkey</option> options.
738
</para>
739
</listitem>
740
</varlistentry>
741
<varlistentry>
742
<term><filename
743
class="directory">/lib/mandos/network-hooks.d</filename></term>
744
<listitem>
745
<para>
746
Directory where network hooks are located. Change this
747
with the <option>--network-hook-dir</option> option. See
748
<xref linkend="network-hooks"/>.
749
</para>
750
</listitem>
751
</varlistentry>
752
</variablelist>
753
</refsect1>
243
754
244
755
<refsect1 id="bugs">
245
756
<title>BUGS</title>
246
<para>
247
</para>
248
</refsect1>
249
757
<xi:include href="../bugs.xml"/>
758
</refsect1>
759
250
760
<refsect1 id="example">
251
761
<title>EXAMPLE</title>
252
762
<para>
763
Note that normally, command line options will not be given
764
directly, but via options for the Mandos <citerefentry
765
><refentrytitle>plugin-runner</refentrytitle>
766
<manvolnum>8mandos</manvolnum></citerefentry>.
253
767
</para>
768
<informalexample>
769
<para>
770
Normal invocation needs no options, if the network interfaces
771
can be automatically determined:
772
</para>
773
<para>
774
<userinput>&COMMANDNAME;</userinput>
775
</para>
776
</informalexample>
777
<informalexample>
778
<para>
779
Search for Mandos servers (and connect to them) using one
780
specific interface:
781
</para>
782
<para>
783
<!-- do not wrap this line -->
784
<userinput>&COMMANDNAME; --interface eth1</userinput>
785
</para>
786
</informalexample>
787
<informalexample>
788
<para>
789
Run in debug mode, and use custom keys:
790
</para>
791
<para>
792
793
<!-- do not wrap this line -->
794
<userinput>&COMMANDNAME; --debug --pubkey keydir/pubkey.txt --seckey keydir/seckey.txt --tls-pubkey keydir/tls-pubkey.pem --tls-privkey keydir/tls-privkey.pem</userinput>
795
796
</para>
797
</informalexample>
798
<informalexample>
799
<para>
800
Run in debug mode, with custom keys, and do not use Zeroconf
801
to locate a server; connect directly to the IPv6 link-local
802
address <quote><systemitem class="ipaddress"
803
>fe80::aede:48ff:fe71:f6f2</systemitem></quote>, port 4711,
804
using interface eth2:
805
</para>
806
<para>
807
808
<!-- do not wrap this line -->
809
<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>
810
811
</para>
812
</informalexample>
254
813
</refsect1>
255
814
256
815
<refsect1 id="security">
257
816
<title>SECURITY</title>
258
817
<para>
818
This program is set-uid to root, but will switch back to the
819
original (and presumably non-privileged) user and group after
820
bringing up the network interface.
821
</para>
822
<para>
823
To use this program for its intended purpose (see <xref
824
linkend="purpose"/>), the password for the root file system will
825
have to be given out to be stored in a server computer, after
826
having been encrypted using an OpenPGP key. This encrypted data
827
which will be stored in a server can only be decrypted by the
828
OpenPGP key, and the data will only be given out to those
829
clients who can prove they actually have that key. This key,
830
however, is stored unencrypted on the client side in its initial
831
<acronym>RAM</acronym> disk image file system. This is normally
832
readable by all, but this is normally fixed during installation
833
of this program; file permissions are set so that no-one is able
834
to read that file.
835
</para>
836
<para>
837
The only remaining weak point is that someone with physical
838
access to the client hard drive might turn off the client
839
computer, read the OpenPGP and TLS keys directly from the hard
840
drive, and communicate with the server. To safeguard against
841
this, the server is supposed to notice the client disappearing
842
and stop giving out the encrypted data. Therefore, it is
843
important to set the timeout and checker interval values tightly
844
on the server. See <citerefentry><refentrytitle
845
>mandos</refentrytitle><manvolnum>8</manvolnum></citerefentry>.
846
</para>
847
<para>
848
It will also help if the checker program on the server is
849
configured to request something from the client which can not be
850
spoofed by someone else on the network, like SSH server key
851
fingerprints, and unlike unencrypted <acronym>ICMP</acronym>
852
echo (<quote>ping</quote>) replies.
853
</para>
854
<para>
855
<emphasis>Note</emphasis>: This makes it completely insecure to
856
have <application >Mandos</application> clients which dual-boot
857
to another operating system which is <emphasis>not</emphasis>
858
trusted to keep the initial <acronym>RAM</acronym> disk image
859
confidential.
259
860
</para>
260
861
</refsect1>
261
862
262
863
<refsect1 id="see_also">
263
864
<title>SEE ALSO</title>
264
<itemizedlist>
265
<listitem><para>
266
<citerefentry><refentrytitle>mandos</refentrytitle>
267
<manvolnum>8</manvolnum></citerefentry>
268
</para></listitem>
269
270
<listitem><para>
271
<citerefentry><refentrytitle>plugin-runner</refentrytitle>
272
<manvolnum>8mandos</manvolnum></citerefentry>
273
</para></listitem>
274
275
<listitem><para>
276
<citerefentry><refentrytitle>password-prompt</refentrytitle>
277
<manvolnum>8mandos</manvolnum></citerefentry>
278
</para></listitem>
279
280
<listitem><para>
281
<ulink url="http://www.zeroconf.org/">Zeroconf</ulink>
282
</para></listitem>
283
284
<listitem><para>
285
<ulink url="http://www.avahi.org/">Avahi</ulink>
286
</para></listitem>
287
288
<listitem><para>
289
<ulink
290
url="http://www.gnu.org/software/gnutls/">GnuTLS</ulink>
291
</para></listitem>
292
293
<listitem><para>
294
<ulink
295
url="http://www.gnupg.org/related_software/gpgme/">
296
GPGME</ulink>
297
</para></listitem>
298
299
<listitem><para>
300
<citation>RFC 4880: <citetitle>OpenPGP Message
301
Format</citetitle></citation>
302
</para></listitem>
303
304
<listitem><para>
305
<citation>RFC 5081: <citetitle>Using OpenPGP Keys for
306
Transport Layer Security</citetitle></citation>
307
</para></listitem>
308
309
<listitem><para>
310
<citation>RFC 4291: <citetitle>IP Version 6 Addressing
311
Architecture</citetitle>, section 2.5.6, Link-Local IPv6
312
Unicast Addresses</citation>
313
</para></listitem>
314
</itemizedlist>
865
<para>
866
<citerefentry><refentrytitle>intro</refentrytitle>
867
<manvolnum>8mandos</manvolnum></citerefentry>,
868
<citerefentry><refentrytitle>cryptsetup</refentrytitle>
869
<manvolnum>8</manvolnum></citerefentry>,
870
<citerefentry><refentrytitle>crypttab</refentrytitle>
871
<manvolnum>5</manvolnum></citerefentry>,
872
<citerefentry><refentrytitle>mandos</refentrytitle>
873
<manvolnum>8</manvolnum></citerefentry>,
874
<citerefentry><refentrytitle>password-prompt</refentrytitle>
875
<manvolnum>8mandos</manvolnum></citerefentry>,
876
<citerefentry><refentrytitle>plugin-runner</refentrytitle>
877
<manvolnum>8mandos</manvolnum></citerefentry>
878
</para>
879
<variablelist>
880
<varlistentry>
881
<term>
882
<ulink url="http://www.zeroconf.org/">Zeroconf</ulink>
883
</term>
884
<listitem>
885
<para>
886
Zeroconf is the network protocol standard used for finding
887
Mandos servers on the local network.
888
</para>
889
</listitem>
890
</varlistentry>
891
<varlistentry>
892
<term>
893
<ulink url="http://www.avahi.org/">Avahi</ulink>
894
</term>
895
<listitem>
896
<para>
897
Avahi is the library this program calls to find Zeroconf
898
services.
899
</para>
900
</listitem>
901
</varlistentry>
902
<varlistentry>
903
<term>
904
<ulink url="https://www.gnutls.org/">GnuTLS</ulink>
905
</term>
906
<listitem>
907
<para>
908
GnuTLS is the library this client uses to implement TLS for
909
communicating securely with the server, and at the same time
910
send the public key to the server.
911
</para>
912
</listitem>
913
</varlistentry>
914
<varlistentry>
915
<term>
916
<ulink url="https://www.gnupg.org/related_software/gpgme/"
917
>GPGME</ulink>
918
</term>
919
<listitem>
920
<para>
921
GPGME is the library used to decrypt the OpenPGP data sent
922
by the server.
923
</para>
924
</listitem>
925
</varlistentry>
926
<varlistentry>
927
<term>
928
RFC 4291: <citetitle>IP Version 6 Addressing
929
Architecture</citetitle>
930
</term>
931
<listitem>
932
<variablelist>
933
<varlistentry>
934
<term>Section 2.2: <citetitle>Text Representation of
935
Addresses</citetitle></term>
936
<listitem><para/></listitem>
937
</varlistentry>
938
<varlistentry>
939
<term>Section 2.5.5.2: <citetitle>IPv4-Mapped IPv6
940
Address</citetitle></term>
941
<listitem><para/></listitem>
942
</varlistentry>
943
<varlistentry>
944
<term>Section 2.5.6, <citetitle>Link-Local IPv6 Unicast
945
Addresses</citetitle></term>
946
<listitem>
947
<para>
948
This client uses IPv6 link-local addresses, which are
949
immediately usable since a link-local addresses is
950
automatically assigned to a network interface when it
951
is brought up.
952
</para>
953
</listitem>
954
</varlistentry>
955
</variablelist>
956
</listitem>
957
</varlistentry>
958
<varlistentry>
959
<term>
960
RFC 5246: <citetitle>The Transport Layer Security (TLS)
961
Protocol Version 1.2</citetitle>
962
</term>
963
<listitem>
964
<para>
965
TLS 1.2 is the protocol implemented by GnuTLS.
966
</para>
967
</listitem>
968
</varlistentry>
969
<varlistentry>
970
<term>
971
RFC 4880: <citetitle>OpenPGP Message Format</citetitle>
972
</term>
973
<listitem>
974
<para>
975
The data received from the server is binary encrypted
976
OpenPGP data.
977
</para>
978
</listitem>
979
</varlistentry>
980
<varlistentry>
981
<term>
982
RFC 7250: <citetitle>Using Raw Public Keys in Transport
983
Layer Security (TLS) and Datagram Transport Layer Security
984
(DTLS)</citetitle>
985
</term>
986
<listitem>
987
<para>
988
This is implemented by GnuTLS in version 3.6.6 and is, if
989
present, used by this program so that raw public keys can be
990
used.
991
</para>
992
</listitem>
993
</varlistentry>
994
<varlistentry>
995
<term>
996
RFC 6091: <citetitle>Using OpenPGP Keys for Transport Layer
997
Security</citetitle>
998
</term>
999
<listitem>
1000
<para>
1001
This is implemented by GnuTLS before version 3.6.0 and is,
1002
if present, used by this program so that OpenPGP keys can be
1003
used.
1004
</para>
1005
</listitem>
1006
</varlistentry>
1007
</variablelist>
315
1008
</refsect1>
316
317
1009
</refentry>
1010
1011
<!-- Local Variables: -->
1012
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1013
<!-- time-stamp-end: "[\"']>" -->
1014
<!-- time-stamp-format: "%:y-%02m-%02d" -->
1015
<!-- End: -->
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0