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  • Committer: Teddy Hogeborn
  • Date: 2019-02-09 23:23:26 UTC
  • mto: (237.7.594 trunk)
  • mto: This revision was merged to the branch mainline in revision 370.
  • 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.

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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 "mandos-keygen">
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<!ENTITY TIMESTAMP "2008-09-06">
 
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<!ENTITY TIMESTAMP "2019-02-10">
 
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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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    <title>Mandos Manual</title>
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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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      <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>8</manvolnum>
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      Generate key and password for Mandos client and server.
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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>TIME</replaceable></option></arg>
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      </group>
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      <sbr/>
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      <arg><option>--force</option></arg>
 
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      <group>
 
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        <arg choice="plain"><option>--tls-keytype
 
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        <replaceable>KEYTYPE</replaceable></option></arg>
 
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        <arg choice="plain"><option>-T
 
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        <replaceable>KEYTYPE</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>--force</option></arg>
 
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        <arg choice="plain"><option>-f</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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      <group choice="req">
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        <arg choice="plain"><option>--password</option></arg>
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        <arg choice="plain"><option>-p</option></arg>
 
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        <arg choice="plain"><option>--passfile
 
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        <replaceable>FILE</replaceable></option></arg>
 
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        <arg choice="plain"><option>-F</option>
 
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        <replaceable>FILE</replaceable></arg>
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      </group>
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      <sbr/>
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      <group>
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        <arg choice="plain"><option>-n
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        <replaceable>NAME</replaceable></option></arg>
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      </group>
 
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      <group>
 
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        <arg choice="plain"><option>--no-ssh</option></arg>
 
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        <arg choice="plain"><option>-S</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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    <title>DESCRIPTION</title>
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    <para>
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      <command>&COMMANDNAME;</command> is a program to generate the
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      OpenPGP key used by
 
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      TLS and OpenPGP keys used by
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      <citerefentry><refentrytitle>mandos-client</refentrytitle>
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      <manvolnum>8mandos</manvolnum></citerefentry>.  The key is
 
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      <manvolnum>8mandos</manvolnum></citerefentry>.  The keys are
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      normally written to /etc/mandos for later installation into the
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      initrd image, but this, and most other things, can be changed
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      with command line options.
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    </para>
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    <para>
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      This program can also be used with the
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      <option>--password</option> option to generate a ready-made
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      section for <filename>clients.conf</filename> (see
 
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      <option>--password</option> or <option>--passfile</option>
 
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      options to generate a ready-made section for
 
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      <filename>clients.conf</filename> (see
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      <citerefentry><refentrytitle>mandos-clients.conf</refentrytitle>
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      <manvolnum>5</manvolnum></citerefentry>).
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    </para>
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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>--dir
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        <replaceable>DIRECTORY</replaceable></option></term>
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        <listitem>
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          <para>
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            Target directory for key files.  Default is
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            <filename>/etc/mandos</filename>.
 
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            <filename class="directory">/etc/mandos</filename>.
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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>--type
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        <replaceable>TYPE</replaceable></option></term>
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        <replaceable>TYPE</replaceable></option></term>
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        <listitem>
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          <para>
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            Key type.  Default is <quote>DSA</quote>.
 
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            OpenPGP key type.  Default is <quote>RSA</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>--length
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        <replaceable>BITS</replaceable></option></term>
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        <replaceable>BITS</replaceable></option></term>
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        <listitem>
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          <para>
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            Key length in bits.  Default is 2048.
 
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            OpenPGP key length in bits.  Default is 4096.
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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>--subtype
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        <replaceable>KEYTYPE</replaceable></option></term>
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        <replaceable>KEYTYPE</replaceable></option></term>
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        <listitem>
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          <para>
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            Subkey type.  Default is <quote>ELG-E</quote> (Elgamal
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            encryption-only).
 
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            OpenPGP subkey type.  Default is <quote>RSA</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>--sublength
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        <replaceable>BITS</replaceable></option></term>
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        <replaceable>BITS</replaceable></option></term>
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        <listitem>
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          <para>
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            Subkey length in bits.  Default is 2048.
 
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            OpenPGP subkey length in bits.  Default is 4096.
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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>--email
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        <replaceable>ADDRESS</replaceable></option></term>
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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>--comment
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        <replaceable>TEXT</replaceable></option></term>
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        <replaceable>TEXT</replaceable></option></term>
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        <listitem>
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          <para>
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            Comment field for key.  The default value is
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            <quote><literal>Mandos client key</literal></quote>.
 
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            Comment field for key.  Default is empty.
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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>--expire
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        <replaceable>TIME</replaceable></option></term>
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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-keytype
 
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        <replaceable>KEYTYPE</replaceable></option></term>
 
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        <term><option>-T
 
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        <replaceable>KEYTYPE</replaceable></option></term>
 
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        <listitem>
 
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          <para>
 
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            TLS key type.  Default is <quote>ed25519</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>--force</option></term>
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        <term><option>-f</option></term>
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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>--passfile
 
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        <replaceable>FILE</replaceable></option></term>
 
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        <term><option>-F
 
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        <replaceable>FILE</replaceable></option></term>
 
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        <listitem>
 
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          <para>
 
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            The same as <option>--password</option>, but read from
 
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            <replaceable>FILE</replaceable>, not the terminal.
 
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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>--no-ssh</option></term>
 
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        <term><option>-S</option></term>
 
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        <listitem>
 
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          <para>
 
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            When <option>--password</option> or
 
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            <option>--passfile</option> is given, this option will
 
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            prevent <command>&COMMANDNAME;</command> from calling
 
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            <command>ssh-keyscan</command> to get an SSH fingerprint
 
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            for this host and, if successful, output suitable config
 
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            options to use this fingerprint as a
 
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            <option>checker</option> option in the output.  This is
 
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            otherwise the default behavior.
 
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          </para>
 
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        </listitem>
 
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      </varlistentry>
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    </variablelist>
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  </refsect1>
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  <refsect1 id="overview">
333
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    <title>OVERVIEW</title>
334
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    <xi:include href="overview.xml"/>
335
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    <para>
336
 
      This program is a small utility to generate new OpenPGP keys for
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      new Mandos clients, and to generate sections for inclusion in
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      <filename>clients.conf</filename> on the server.
 
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      This program is a small utility to generate new TLS and OpenPGP
 
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      keys for new Mandos clients, and to generate sections for
 
406
      inclusion in <filename>clients.conf</filename> on the server.
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    </para>
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  </refsect1>
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  <refsect1 id="exit_status">
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    <title>EXIT STATUS</title>
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    <para>
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    </variablelist>
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  </refsect1>
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367
 
  <refsect1 id="file">
 
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  <refsect1 id="files">
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    <title>FILES</title>
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    <para>
370
438
      Use the <option>--dir</option> option to change where
391
459
        </listitem>
392
460
      </varlistentry>
393
461
      <varlistentry>
394
 
        <term><filename>/tmp</filename></term>
 
462
        <term><filename>/etc/keys/mandos/tls-privkey.pem</filename></term>
 
463
        <listitem>
 
464
          <para>
 
465
            Private key file which will be created or overwritten.
 
466
          </para>
 
467
        </listitem>
 
468
      </varlistentry>
 
469
      <varlistentry>
 
470
        <term><filename>/etc/keys/mandos/tls-pubkey.pem</filename></term>
 
471
        <listitem>
 
472
          <para>
 
473
            Public key file which will be created or overwritten.
 
474
          </para>
 
475
        </listitem>
 
476
      </varlistentry>
 
477
      <varlistentry>
 
478
        <term><filename class="directory">/tmp</filename></term>
395
479
        <listitem>
396
480
          <para>
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481
            Temporary files will be written here if
401
485
      </varlistentry>
402
486
    </variablelist>
403
487
  </refsect1>
404
 
 
405
 
<!--   <refsect1 id="bugs"> -->
406
 
<!--     <title>BUGS</title> -->
407
 
<!--     <para> -->
408
 
<!--     </para> -->
409
 
<!--   </refsect1> -->
410
 
 
 
488
  
 
489
  <refsect1 id="bugs">
 
490
    <title>BUGS</title>
 
491
    <xi:include href="bugs.xml"/>
 
492
  </refsect1>
 
493
  
411
494
  <refsect1 id="example">
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495
    <title>EXAMPLE</title>
413
496
    <informalexample>
432
515
    </informalexample>
433
516
    <informalexample>
434
517
      <para>
435
 
        Prompt for a password, encrypt it with the key in
436
 
        <filename>/etc/mandos</filename> and output a section suitable
437
 
        for <filename>clients.conf</filename>.
 
518
        Prompt for a password, encrypt it with the key in <filename
 
519
        class="directory">/etc/mandos</filename> and output a section
 
520
        suitable for <filename>clients.conf</filename>.
438
521
      </para>
439
522
      <para>
440
523
        <userinput>&COMMANDNAME; --password</userinput>
454
537
      </para>
455
538
    </informalexample>
456
539
  </refsect1>
457
 
 
 
540
  
458
541
  <refsect1 id="security">
459
542
    <title>SECURITY</title>
460
543
    <para>
469
552
      <manvolnum>8</manvolnum></citerefentry>.
470
553
    </para>
471
554
  </refsect1>
472
 
 
 
555
  
473
556
  <refsect1 id="see_also">
474
557
    <title>SEE ALSO</title>
475
558
    <para>
 
559
      <citerefentry><refentrytitle>intro</refentrytitle>
 
560
      <manvolnum>8mandos</manvolnum></citerefentry>,
476
561
      <citerefentry><refentrytitle>gpg</refentrytitle>
477
562
      <manvolnum>1</manvolnum></citerefentry>,
478
563
      <citerefentry><refentrytitle>mandos-clients.conf</refentrytitle>
480
565
      <citerefentry><refentrytitle>mandos</refentrytitle>
481
566
      <manvolnum>8</manvolnum></citerefentry>,
482
567
      <citerefentry><refentrytitle>mandos-client</refentrytitle>
483
 
      <manvolnum>8mandos</manvolnum></citerefentry>
 
568
      <manvolnum>8mandos</manvolnum></citerefentry>,
 
569
      <citerefentry><refentrytitle>ssh-keyscan</refentrytitle>
 
570
      <manvolnum>1</manvolnum></citerefentry>
484
571
    </para>
485
572
  </refsect1>
486
573