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0.2
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stpeter
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xep-0262.xml
129
xep-0262.xml
@ -10,7 +10,7 @@
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<abstract>This specification defines a Jingle application type for negotiating one or more sessions that use the Real-time Transport Protocol (RTP) to exchange media such as voice or video. The application type includes a straightforward mapping to Session Description Protocol (SDP) for interworking with SIP media endpoints.</abstract>
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&LEGALNOTICE;
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<number>0262</number>
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<status>Deferred</status>
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<status>Experimental</status>
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<type>Standards Track</type>
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<sig>Standards</sig>
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<approver>Council</approver>
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@ -25,6 +25,12 @@
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<shortname>jingle-zrtp</shortname>
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<discuss>jingle</discuss>
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&stpeter;
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<revision>
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<version>0.2</version>
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<date>2010-08-09</date>
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<initials>psa</initials>
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<remark><p>In harmony with the ZRTP spec, moved communication of <zrtp-hash/> element from Jingle session-info message to jingle-invite, specifically as a child of the <encryption/> element from XEP-0167; increased protocol version from zero to one.</p></remark>
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</revision>
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<revision>
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<version>0.1</version>
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<date>2009-02-25</date>
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@ -55,46 +61,113 @@ a=zrtp-hash:zrtp-version zrtp-hash-value
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<code>
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a=zrtp-hash:1.10 fe30efd02423cb054e50efd0248742ac7a52c8f91bc2df881ae642c371ba46df
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</code>
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<p>This SDP attribute can be translated into Jingle as a <zrtp-hash/> element, as shown below.</p>
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<p>This SDP attribute can be translated into Jingle as a <zrtp-hash/> element qualified by the 'urn:xmpp:jingle:apps:rtp:zrtp:1' namespace, as shown below.</p>
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<code><![CDATA[
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<zrtp-hash version='zrtp-version'>zrtp-hash-value</zrtp-hash>
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<zrtp-hash version='zrtp-version' xmlns='urn:xmpp:jingle:apps:rtp:zrtp:1'>zrtp-hash-value</zrtp-hash>
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]]></code>
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<p>An example follows.</p>
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<code><![CDATA[
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<zrtp-hash version='1.10'>fe30efd02423cb054e50efd0248742ac7a52c8f91bc2df881ae642c371ba46df</zrtp-hash>
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<zrtp-hash version='1.10' xmlns='urn:xmpp:jingle:apps:rtp:zrtp:1'>
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fe30efd02423cb054e50efd0248742ac7a52c8f91bc2df881ae642c371ba46df
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</zrtp-hash>
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]]></code>
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<p>If either party to a Jingle RTP session wishes to use ZRTP, the party SHOULD send a Jingle session-info message that includes a <zrtp-hash/> element qualified by the 'urn:xmpp:jingle:apps:rtp:zrtp:0' namespace, as shown in the following example.</p>
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<example caption="Initiator sends session-info message with zrtp-hash"><![CDATA[
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<p>The <zrtp-hash/> element is sent as a child of the <encryption/> element defined in &xep0167;.</p>
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<p>If the Jingle initiator wishes to use ZRTP, it includes the <zrtp-hash/> element in its session invitation (where it hashes over its own Hello message as described in the ZRTP specification).</p>
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<example caption="Initiator sends session invitation with zrtp-hash"><![CDATA[
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<iq from='romeo@montague.lit/orchard'
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id='vna13b9a'
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from='juliet@capulet.lit/balcony'
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id='uz61v4m4'
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to='juliet@capulet.lit/balcony'
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type='set'>
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<jingle xmlns='urn:xmpp:jingle:0'
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action='session-info'
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<jingle xmlns='urn:xmpp:jingle:1'
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action='session-initiate'
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initiator='romeo@montague.lit/orchard'
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sid='a73sjjvkla37jfea'>
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<zrtp-hash xmlns='urn:xmpp:jingle:apps:rtp:zrtp:0'
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version='1.10'>fe30efd02423cb054e50efd0248742ac7a52c8f91bc2df881ae642c371ba46df</zrtp-hash>
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<content creator='initiator' name='voice'>
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<description xmlns='urn:xmpp:jingle:apps:rtp:1' media='audio'>
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<payload-type id='96' name='speex' clockrate='16000'/>
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<payload-type id='97' name='speex' clockrate='8000'/>
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<payload-type id='18' name='G729'/>
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<payload-type id='103' name='L16' clockrate='16000' channels='2'/>
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<payload-type id='98' name='x-ISAC' clockrate='8000'/>
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<encryption required='true'>
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<zrtp-hash xmlns='urn:xmpp:jingle:apps:rtp:zrtp:1' version='1.10'>
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fe30efd02423cb054e50efd0248742ac7a52c8f91bc2df881ae642c371ba46df
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</zrtp-hash>
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</encryption>
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</description>
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<transport xmlns='urn:xmpp:jingle:transports:ice-udp:1'
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pwd='asd88fgpdd777uzjYhagZg'
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ufrag='8hhy'>
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<candidate component='1'
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foundation='1'
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generation='0'
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id='el0747fg11'
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ip='10.0.1.1'
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network='1'
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port='8998'
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priority='2130706431'
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protocol='udp'
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type='host'/>
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<candidate component='1'
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foundation='2'
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generation='0'
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id='y3s2b30v3r'
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ip='192.0.2.3'
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network='1'
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port='45664'
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priority='1694498815'
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protocol='udp'
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rel-addr='10.0.1.1'
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rel-port='8998'
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type='srflx'/>
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</transport>
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</content>
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</jingle>
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</iq>
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]]></example>
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<p>In accordance with <cite>XEP-0166</cite>, if the receiving party does not understand the payload of the session-info message then it MUST return a &feature; error.</p>
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<example caption="Receiver returns feature-not-implemented error"><![CDATA[
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<p>If the receiving party wishes to proceed with ZRTP negotiation, it also includes the <zrtp-hash/> element in its session-accept message (where it hashes over its own Hello message as described in the ZRTP specification).</p>
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<example caption="Responder sends session-accept"><![CDATA[
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<iq from='juliet@capulet.lit/balcony'
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id='ringing1'
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id='pn2va48j'
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to='romeo@montague.lit/orchard'
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type='error'>
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<error type='modify'>
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<feature-not-implemented xmlns='urn:ietf:params:xml:ns:xmpp-stanzas'/>
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<unsupported-info xmlns='urn:xmpp:jingle:errors:0'/>
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</error>
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type='set'>
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<jingle xmlns='urn:xmpp:jingle:1'
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action='session-accept'
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initiator='romeo@montague.lit/orchard'
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responder='juliet@capulet.lit/balcony'
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sid='a73sjjvkla37jfea'>
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<content creator='initiator' name='voice'>
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<description xmlns='urn:xmpp:jingle:apps:rtp:1' media='audio'>
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<payload-type id='97' name='speex' clockrate='8000'/>
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<payload-type id='18' name='G729'/>
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<encryption>
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<zrtp-hash xmlns='urn:xmpp:jingle:apps:rtp:zrtp:1' version='1.10'>
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badfbe66ff87fe135750377509b09b0babd1c3ec25fa4314565e2bf7ccc30299
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</zrtp-hash>
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</encryption>
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</description>
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<transport xmlns='urn:xmpp:jingle:transports:ice-udp:1'
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pwd='YH75Fviy6338Vbrhrlp8Yh'
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ufrag='9uB6'>
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<candidate component='1'
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foundation='1'
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generation='0'
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id='or2ii2syr1'
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ip='192.0.2.1'
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network='0'
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port='3478'
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priority='2130706431'
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protocol='udp'
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type='host'/>
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</transport>
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</content>
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</jingle>
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</iq>
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]]></example>
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<p>However, if the receiving party also supports and wishes to use ZRTP, it too SHOULD send a session-info message containing a zrtp-hash element.</p>
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</section1>
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<section1 topic='Determining Support' anchor='disco'>
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<p>If an entity supports the zrtp-hash session-info message, it MUST advertise that fact in its responses to &xep0030; information ("disco#info") requests by returning a feature of "urn:xmpp:jingle:apps:rtp:zrtp:0":</p>
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<p>If an entity supports the zrtp-hash session-info message, it MUST advertise that fact in its responses to &xep0030; information ("disco#info") requests by returning a feature of "urn:xmpp:jingle:apps:rtp:zrtp:1":</p>
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<example caption='A disco#info query'><![CDATA[
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<iq type='get'
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from='calvin@usrobots.lit/lab'
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@ -109,7 +182,7 @@ a=zrtp-hash:1.10 fe30efd02423cb054e50efd0248742ac7a52c8f91bc2df881ae642c371ba46d
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to='calvin@usrobots.lit/lab'
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id='disco1'>
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<query xmlns='http://jabber.org/protocol/disco#info'>
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<feature var='urn:xmpp:jingle:apps:rtp:zrtp:0'/>
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<feature var='urn:xmpp:jingle:apps:rtp:zrtp:1'/>
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</query>
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</iq>
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]]></example>
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@ -125,11 +198,15 @@ a=zrtp-hash:1.10 fe30efd02423cb054e50efd0248742ac7a52c8f91bc2df881ae642c371ba46d
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<p>This document requires no interaction with &IANA;.</p>
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</section1>
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<section1 topic='Acknowledgements' anchor='acks'>
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<p>Thanks to Werner Dittmann and Emil Ivov for their implementation feedback.</p>
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</section1>
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<section1 topic='XMPP Registrar Considerations' anchor='registrar'>
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<section2 topic='Protocol Namespaces' anchor='registrar-ns'>
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<p>This specification defines the following XML namespace:</p>
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<ul>
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<li>urn:xmpp:jingle:apps:rtp:zrtp:0</li>
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<li>urn:xmpp:jingle:apps:rtp:zrtp:1</li>
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</ul>
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<p>Upon advancement of this specification from a status of Experimental to a status of Draft, the ®ISTRAR; shall add the foregoing namespace to the registry located at &NAMESPACES;, as described in Section 4 of &xep0053;.</p>
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</section2>
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@ -144,8 +221,8 @@ a=zrtp-hash:1.10 fe30efd02423cb054e50efd0248742ac7a52c8f91bc2df881ae642c371ba46d
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<xs:schema
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xmlns:xs='http://www.w3.org/2001/XMLSchema'
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targetNamespace='urn:xmpp:jingle:apps:rtp:zrtp:0'
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xmlns='urn:xmpp:jingle:apps:rtp:zrtp:0'
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targetNamespace='urn:xmpp:jingle:apps:rtp:zrtp:1'
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xmlns='urn:xmpp:jingle:apps:rtp:zrtp:1'
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elementFormDefault='qualified'>
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<xs:element name='zrtp-hash'>
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