<?xml version='1.0' encoding='UTF-8'?>
<!DOCTYPE xep SYSTEM 'xep.dtd' [
<!ENTITY secret "<secret/>">
<!ENTITY % ents SYSTEM 'xep.ent'>
%ents;
]>
<?xml-stylesheet type='text/xsl' href='xep.xsl'?>
<xep>
<header>
<title>Jingle Encrypted Transports - OMEMO</title>
<abstract>Extension for JET introducing OMEMO End-to-End Encrypted Jingle Transports.</abstract>
&LEGALNOTICE;
<number>0396</number>
<status>Deferred</status>
<type>Standards Track</type>
<sig>Standards</sig>
<approver>Council</approver>
<dependencies>
<spec>XEP-0391</spec>
<spec>XEP-0234</spec>
<spec>XEP-0384</spec>
</dependencies>
<supersedes/>
<supersededby/>
<shortname>jet-omemo</shortname>
<schemaloc>
<ns>jingle</ns>
<url>http://xmpp.org/schemas/jingle.xsd</url>
</schemaloc>
<schemaloc>
<ns>jingle:errors</ns>
<url>http://xmpp.org/schemas/jingle-errors.xsd</url>
</schemaloc>
<registry/>
<discuss>jingle</discuss>
&paulschaub;
<revision>
<version>0.2.0</version>
<date>2018-12-06</date>
<initials>XEP Editor (jsc)</initials>
<remark>Defer due to lack of activity.</remark>
</revision>
<revision>
<version>0.1</version>
<date>2017-11-29</date>
<initials>XEP Editor (jwi)</initials>
<remark><p>Accepted by Council as Expremental XEP</p></remark>
</revision>
<revision>
<version>0.0.1</version>
<date>2017-10-06</date>
<initials>vv</initials>
<remark><p>First draft</p></remark>
</revision>
</header>
<section1 topic='Introduction' anchor='intro'>
<p>&xep0391; can be used to utilize different end-to-end encryption methods to secure Jingle Transports, eg. in the context of &xep0234;. This document aims to extend &xep0391; to allow the use of OMEMO encryption with Jingle transports. To achieve this goal, this protocol extension makes use of OMEMOs <link url='https://xmpp.org/extensions/xep-0384.html#usecases-keysend'>KeyTransportElements</link>.</p>
</section1>
<section1 topic='Mappings' anchor='mappings'>
<p>Conveniently the OMEMO protocol already provides a way to transport key material to another entity. So called KeyTransportElements are basically normal OMEMO MessageElements, but without a payload, so the contained key can be used for something else (see Section 4.6 of <cite>XEP-0384</cite>). This extension uses the key encrypted in the KeyTransportMessages <key> attribute and initialization vector from the <iv> attribute to secure Jingle Transports. The key corresponds to the <cite>Transport Key</cite> of <cite>XEP-0391</cite>, while the iv corresponds to the <cite>Initialization Vector</cite>. The KeyTransportMessage is the equivalent to the <cite>Envelope Element</cite>. Note that within the Envelope Element, the Transport Key is encrypted with the OMEMO ratchet.</p>
</section1>
<section1 topic='Limitations' anchor='limitations'>
<p>Unfortunately &xep0384; determines the type of the transported key to be AES-128-GCM-NoPadding, so no other configuration can be used in the context of this extension.</p>
<p>Since OMEMO deviceIds are not bound to XMPP resources, the initiator MUST encrypt the Transport Key for every device of the recipient.</p>
</section1>
<section1 topic='Key Transport' anchor='transport'>
<p>In order to transport a key to the responder, the initiator creates a fresh AES-128-GCM-NoPadding Transport Key and Initialization Vector and generates an OMEMO KeyTransportElement from it as described in <cite>XEP-0384</cite>. This is then added as a child of the JET <security> element. The 'cipher' attribute MUST be set to 'aes-128-gcm-nopadding:0' (see the <link url='https://xmpp.org/extensions/xep-0391.html#ciphers'>ciphers</link> section of <cite>XEP-0391</cite>). The value of the 'type' attribute must be set to the namespace of the used version of <cite>XEP-0384</cite> &VNOTE;.</p>
<p></p>
<example caption="Romeo initiates an OMEMO encrypted file offer"><![CDATA[
<iq from='romeo@montague.example/dr4hcr0st3lup4c'
id='nzu25s8'
to='juliet@capulet.example/yn0cl4bnw0yr3vym'
type='set'>
<jingle xmlns='urn:xmpp:jingle:1'
action='session-initiate'
initiator='romeo@montague.example/dr4hcr0st3lup4c'
sid='851ba2'>
<content creator='initiator' name='a-file-offer' senders='initiator'>
<description xmlns='urn:xmpp:jingle:apps:file-transfer:5'>
<file>
<date>1969-07-21T02:56:15Z</date>
<desc>This is a test. If this were a real file...</desc>
<media-type>text/plain</media-type>
<name>test.txt</name>
<range/>
<size>6144</size>
<hash xmlns='urn:xmpp:hashes:2'
algo='sha-1'>w0mcJylzCn+AfvuGdqkty2+KP48=</hash>
</file>
</description>
<transport xmlns='urn:xmpp:jingle:transports:s5b:1'
mode='tcp'
sid='vj3hs98y'>
<candidate cid='hft54dqy'
host='192.168.4.1'
jid='romeo@montague.example/dr4hcr0st3lup4c'
port='5086'
priority='8257636'
type='direct'/>
</transport>
<security xmlns='urn:xmpp:jingle:jet:0'
name='a-file-offer'
cipher='urn:xmpp:ciphers:aes-128-gcm-nopadding'
type='eu.siacs.conversations.axolotl'>
<encrypted xmlns='eu.siacs.conversations.axolotl'>
<header sid='27183'>
<key rid='31415'>BASE64ENCODED...</key>
<key prekey="true" rid='12321'>BASE64ENCODED...</key>
<!-- ... -->
<iv>BASE64ENCODED...</iv>
</header>
</encrypted>
</security>
</content>
</jingle>
</iq>]]></example>
<p>The recipient decrypts the OMEMO KeyTransportElement to retrieve the Transport Secret. Transport Key and Initialization Vector are later used to encrypt/decrypt data as described in &xep0391;.</p>
</section1>
<section1 topic='Determining Support' anchor='support'>
<p>To advertise its support for JET-OMEMO, when replying to service discovery information ("disco#info") requests an entity MUST return URNs for any version of this extension, as well as of the JET extension that the entity supports -- e.g., "urn:xmpp:jingle:jet-omemo:0" for this version, or "urn:xmpp:jingle:jet:0" for &xep0391; &VNOTE;.</p>
<example caption="Service discovery information request"><![CDATA[
<iq from='romeo@montague.example/dr4hcr0st3lup4c'
id='uw72g176'
to='juliet@capulet.example/yn0cl4bnw0yr3vym'
type='get'>
<query xmlns='http://jabber.org/protocol/disco#info'/>
</iq>]]></example>
<example caption="Service discovery information response"><![CDATA[
<iq from='juliet@capulet.example/yn0cl4bnw0yr3vym'
id='uw72g176'
to='romeo@montague.example/dr4hcr0st3lup4c'
type='result'>
<query xmlns='http://jabber.org/protocol/disco#info'>
<feature var='urn:xmpp:jingle:jet:0'/>
<feature var='urn:xmpp:jingle:jet-omemo:0'/>
</query>
</iq>]]></example>
<p>In order for an application to determine whether an entity supports this protocol, where possible it SHOULD use the dynamic, presence-based profile of service discovery defined in &xep0115;. However, if an application has not received entity capabilities information from an entity, it SHOULD use explicit service discovery instead.</p>
</section1>
</xep>