Network Working Group P. Saint-Andre Internet-Draft Cisco Systems, Inc. Intended status: Standards Track S. Loreto Expires: March 23, 2014 E. Gavita N. Hossain Ericsson September 19, 2013 Interworking between the Session Initiation Protocol (SIP) and the Extensible Messaging and Presence Protocol (XMPP): One-to-One Text Chat Sessions draft-ietf-stox-chat-02 Abstract This document defines a bidirectional protocol mapping for the exchange of instant messages in the context of a one-to-one chat session between a user of the Session Initiation Protocol (SIP) and a user of the Extensible Messaging and Presence Protocol (XMPP). Specifically for SIP text chat, this document specifies a mapping to the Message Session Relay Protocol (MSRP). Status of this Memo This Internet-Draft is submitted in full conformance with the provisions of BCP 78 and BCP 79. Internet-Drafts are working documents of the Internet Engineering Task Force (IETF). Note that other groups may also distribute working documents as Internet-Drafts. The list of current Internet- Drafts is at http://datatracker.ietf.org/drafts/current/. Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any time. It is inappropriate to use Internet-Drafts as reference material or to cite them other than as "work in progress." This Internet-Draft will expire on March 23, 2014. Copyright Notice Copyright (c) 2013 IETF Trust and the persons identified as the document authors. All rights reserved. This document is subject to BCP 78 and the IETF Trust's Legal Provisions Relating to IETF Documents (http://trustee.ietf.org/license-info) in effect on the date of Saint-Andre, et al. Expires March 23, 2014 [Page 1] Internet-Draft SIP-XMPP Interworking: Chat September 2013 publication of this document. Please review these documents carefully, as they describe your rights and restrictions with respect to this document. Code Components extracted from this document must include Simplified BSD License text as described in Section 4.e of the Trust Legal Provisions and are provided without warranty as described in the Simplified BSD License. Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3 2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 3 3. XMPP to MSRP . . . . . . . . . . . . . . . . . . . . . . . . . 4 4. MSRP to XMPP . . . . . . . . . . . . . . . . . . . . . . . . . 8 5. Composing Events . . . . . . . . . . . . . . . . . . . . . . . 11 6. Delivery Reports . . . . . . . . . . . . . . . . . . . . . . . 13 7. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 15 8. Security Considerations . . . . . . . . . . . . . . . . . . . 15 9. References . . . . . . . . . . . . . . . . . . . . . . . . . . 15 9.1. Normative References . . . . . . . . . . . . . . . . . . . 15 9.2. Informative References . . . . . . . . . . . . . . . . . . 16 Appendix A. Acknowledgements . . . . . . . . . . . . . . . . . . 16 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 17 Saint-Andre, et al. Expires March 23, 2014 [Page 2] Internet-Draft SIP-XMPP Interworking: Chat September 2013 1. Introduction Both the Session Initiation Protocol [RFC3261] and the Extensible Messaging and Presence Protocol [RFC6120] can be used for the purpose of one-to-one text chat over the Internet. To ensure interworking between these technologies, it is important to define bidirectional protocol mappings. The architectural assumptions underlying such protocol mappings are provided in [I-D.ietf-stox-core], including mapping of addresses and error conditions. This document specifies mappings for one-to-one text chat sessions (sometimes called "session-mode" messaging); in particular, this document specifies mappings between XMPP messages of type "chat" and the Message Session Relay Protocol [RFC4975]. Mappings for single instant messages and groupchat are provided in separate documents. The approach taken here is to directly map syntax and semantics from one protocol to another. The mapping described herein depends on the protocols defined in the following specifications: o XMPP chat sessions using message stanzas of type "chat" are specified in [RFC6121]. o SIP-based chat sessions using the SIP INVITE and SEND request types are specified in [RFC4975]. In SIMPLE, a chat session is formally negotiated just as any other session type is using SIP. By contrast, a one-to-one chat "session" in XMPP is an informal construct and is not formally negotiated: a user simply sends a message of type "chat" to a contact, the contact then replies to the message, and the sum total of such messages exchanged during a defined period of time is considered to be a chat session. To overcome the disparity between these approaches, a gateway that wishes to map between SIP and XMPP for one-to-one chat sessions needs to maintain some additional state, as described below. The discussion venue for this document is the mailing list of the STOX WG; visit https://www.ietf.org/mailman/listinfo/stox for subscription information and discussion archives. 2. Terminology The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in [RFC2119]. Saint-Andre, et al. Expires March 23, 2014 [Page 3] Internet-Draft SIP-XMPP Interworking: Chat September 2013 3. XMPP to MSRP In XMPP, the "informal session" approach is to simply send someone a of type "chat" without starting any session negotiation ahead of time (as described in [RFC6121]). The XMPP "informal session" approach maps very well into a SIP MESSAGE request, as described in [I-D.ietf-stox-core]. However, the XMPP informal session approach can also be mapped to MSRP if the XMPP-to-SIP gateway maintains additional state. The order of events is as follows. XMPP User GW SIP User | | | |(F1) (XMPP) Chat message | | |------------------------->| | | |(F2) (SIP) INVITE | | |------------------------->| | |(F3) (SIP) 200 OK | | |<-------------------------| | |(F4) (SIP) ACK | | |------------------------->| | |(F5) (MSRP) SEND | | |------------------------->| | |(F6) (MSRP) A reply | | |<-------------------------| |(F7) (XMPP) A reply | | |<-------------------------| | | | | . . . . . . . . . | | | | |(F8) (SIP) BYE | | |<-------------------------| | |(F9) (SIP) 200 OK | | |------------------------->| | | | The mapping of XMPP syntax to SIP syntax SHOULD be as shown in the following table. (Mappings for several aspects not mentioned here are specified in [I-D.ietf-stox-im].) Saint-Andre, et al. Expires March 23, 2014 [Page 4] Internet-Draft SIP-XMPP Interworking: Chat September 2013 Table 1: Message syntax mapping from XMPP to SIP +-----------------------------+--------------------------+ | XMPP Element or Attribute | SIP Header or Contents | +-----------------------------+--------------------------+ | | Call-ID | | id | transaction identifier | +-----------------------------+--------------------------+ First the XMPP user would generate an XMPP chat message. Example 1: Juliet sends XMPP message (F1) | | 29377446-0CBB-4296-8958-590D79094C50 | Art thou not Romeo, and a Montague? | The local SIP-to-XMPP gateway at the SIMPLE server would then initiate an MSRP session with Romeo on Juliet's behalf (since there is no reliable way for the SIMPLE server to determine if Romeo's user agent supports MSRP, it simply needs to guess). Example 2: Gateway starts SIP session on behalf of Juliet (F2) | INVITE sip:romeo@example.net SIP/2.0 | To: | From: | Contact: ;gr=balcony | Subject: Open chat with Juliet? | Call-ID: 29377446-0CBB-4296-8958-590D79094C50 | Content-Type: application/sdp | | c=IN IP4 x2s.example.com | m=message 7654 TCP/MSRP * | a=accept-types:text/plain | a=lang:en | a=lang:it | a=path:msrp://x2s.example.com:7654/jshA7weztas;tcp Here we assume that Romeo accepts the MSRP session request. Saint-Andre, et al. Expires March 23, 2014 [Page 5] Internet-Draft SIP-XMPP Interworking: Chat September 2013 Example 3: Romeo accepts session request (F3) | SIP/2.0 200 OK | To: ;gr=balcony | From: | Contact: ;gr=orchard | Call-ID: 29377446-0CBB-4296-8958-590D79094C50 | Content-Type: application/sdp | | c=IN IP4 s2x.example.net | m=message 12763 TCP/MSRP * | a=accept-types:text/plain | a=lang:it | a=path:msrp://s2x.example.net:12763/kjhd37s2s20w2a;tcp The XMPP-to-SIP gateway then acknowledges the session acceptance on behalf of Juliet. Example 4: Gateway sends ACK to Romeo (F4) | ACK sip:juliet@example.com SIP/2.0 | To: ;gr=orchard | From: | Contact: ;gr=balcony | Call-ID: 29377446-0CBB-4296-8958-590D79094C50 The XMPP-to-SIP gateway then transforms the original XMPP chat message into MSRP. Example 5: Gateway maps XMPP message to MSRP (F5) | MSRP a786hjs2 SEND | From-Path: msrp://x2s.example.com:7654/jshA7weztas;tcp | To-Path: msrp://s2x.example.net:12763/kjhd37s2s20w2a;tcp | Message-ID: 54C6F4F1-A39C-47D6-8718-FA65B3D0414A | Byte-Range: 1-25/25 | Content-Type: text/plain | | Art thou not Romeo, and a Montague? | -------a786hjs2$ Romeo can then send a reply using his MSRP user agent. Saint-Andre, et al. Expires March 23, 2014 [Page 6] Internet-Draft SIP-XMPP Interworking: Chat September 2013 Example 6: Romeo sends reply (F6) | MSRP di2fs53v SEND | To-Path: msrp://x2s.example.com:7654/jshA7weztas;tcp | From-Path: msrp://s2x.example.net:12763/kjhd37s2s20w2a;tcp | Message-ID: 6480C096-937A-46E7-BF9D-1353706B60AA | Byte-Range: 1-25/25 | Failure-Report: no | Content-Type: text/plain | | Neither, fair saint, if either thee dislike. | -------di2fs53v$ The SIP-to-XMPP gateway would then transform that message into appropriate XMPP syntax for routing to the intended recipient. Example 7: Gateway maps MSRP message to XMPP (F7) | | 29377446-0CBB-4296-8958-590D79094C50 | Neither, fair saint, if either thee dislike. | When the MSRP user wishes to end the chat session, the user's MSRP client sends a SIP BYE. Example 8: Romeo terminates chat session (F8) | BYE juliet@example.com sip: SIP/2.0 | Max-Forwards: 70 | From: ;tag=087js | To: ;tag=786 | Call-ID: 29377446-0CBB-4296-8958-590D79094C50 | Cseq: 1 BYE | Content-Length: 0 The BYE is then acknowledged by the XMPP-to-SIP gateway. Saint-Andre, et al. Expires March 23, 2014 [Page 7] Internet-Draft SIP-XMPP Interworking: Chat September 2013 Example 9: Gateway acknowledges termination (F9) | SIP/2.0 200 OK | From: ;tag=786 | To: ;tag=087js | Call-ID: 29377446-0CBB-4296-8958-590D79094C50 | CSeq: 1 BYE | Content-Length: 0 4. MSRP to XMPP When an MSRP client sends messages through a gateway to an XMPP client that does not support formal sessions, the order of events is as follows. SIP User GW XMPP User | | | |(F1)(SIP) INVITE | | |------------------------>| | |(F2)(SIP) 200 OK | | |<------------------------| | |(F3)(SIP) ACK | | |------------------------>| | |(F4)(MSRP) SEND | | |------------------------>| | | |(F5)(XMPP) A chat message | | |------------------------->| | |(F6)(XMPP) A reply | | |<-------------------------| | | | |(F7)(MSRP) SEND | | |<------------------------| | | | | . . . . . . . . . | | | |(F8)(SIP) BYE | | |------------------------>| | |(F9)(SIP) 200 OK | | |<------------------------| | | | | The mapping of SIP syntax to XMPP syntax SHOULD be as shown in the following table. (Mappings for several aspects not mentioned here are specified in [I-D.ietf-stox-im].) Saint-Andre, et al. Expires March 23, 2014 [Page 8] Internet-Draft SIP-XMPP Interworking: Chat September 2013 Table 2: Message syntax mapping from SIP to XMPP +--------------------------+-----------------------------+ | SIP Header or Contents | XMPP Element or Attribute | +--------------------------+-----------------------------+ | Call-ID | | | transaction identifier | id | +--------------------------+-----------------------------+ Example 10: Romeo starts chat session (F1) | INVITE sip:juliet@example.com SIP/2.0 | To: | From: | Contact: ;gr=orchard | Subject: Open chat with Romeo? | Call-ID: F6989A8C-DE8A-4E21-8E07-F0898304796F | Content-Type: application/sdp | | c=IN IP4 s2x.example.net | m=message 7313 TCP/MSRP * | a=accept-types:text/plain | a=lang:en | a=lang:it | a=path:msrp://s2x.example.net:7313/ansp71weztas;tcp Example 11: Gateway accepts session on Juliet's behalf (F2) | SIP/2.0 200 OK | To: ;gr=orchard | From: | Contact: ;gr=balcony | Call-ID: F6989A8C-DE8A-4E21-8E07-F0898304796F | Content-Type: application/sdp | | c=IN IP4 x2s.example.com | m=message 8763 TCP/MSRP * | a=accept-types:text/plain | a=lang:it | a=path:msrp://x2s.example.com:8763/lkjh37s2s20w2a;tcp Saint-Andre, et al. Expires March 23, 2014 [Page 9] Internet-Draft SIP-XMPP Interworking: Chat September 2013 Example 12: Romeo sends ACK (F3) | ACK sip:juliet@example.com SIP/2.0 | To: ;gr=balcony | From: | Contact: ;gr=orchard | Call-ID: F6989A8C-DE8A-4E21-8E07-F0898304796F Example 13: Romeo sends message (F4) | MSRP ad49kswow SEND | To-Path: msrp://x2s.example.com:8763/lkjh37s2s20w2a;tcp | From-Path: msrp://s2x.example.net:7313/ansp71weztas;tcp | Message-ID: 676FDB92-7852-443A-8005-2A1B9FE44F4E | Byte-Range: 1-32/32 | Failure-Report: no | Content-Type: text/plain | | I take thee at thy word ... | -------ad49kswow$ Example 14: SIP-XMPP gateway maps MSRP message to XMPP (F5) | | F6989A8C-DE8A-4E21-8E07-F0898304796F | I take thee at thy word ... | Example 15: Juliet sends reply (F6) | | 29377446-0CBB-4296-8958-590D79094C50 | What man art thou ...? | Saint-Andre, et al. Expires March 23, 2014 [Page 10] Internet-Draft SIP-XMPP Interworking: Chat September 2013 Example 16: Gateway maps XMPP message to MSRP (F8) | MSRP ms53b7z9 SEND | To-Path: msrp://s2x.example.net:7313/jshA7weztas;tcp | From-Path: msrp://x2s.example.com:8763/lkjh37s2s20w2a;tcp | Message-ID: 17EBA17B-94C0-463B-AD84-DE405C4C9D41 | Byte-Range: 1-25/25 | Failure-Report: no | Content-Type: text/plain | | What man art thou ...? | -------ms53b7z9$ Example 17: Romeo terminates chat session (F9) | BYE juliet@example.com sip: SIP/2.0 | Max-Forwards: 70 | To: ;gr=balcony | From: | Contact: ;gr=orchard | Call-ID: F6989A8C-DE8A-4E21-8E07-F0898304796F | Cseq: 1 BYE | Content-Length: 0 Example 18: Gateway acknowledges termination of session on behalf of Juliet (F10) | SIP/2.0 200 OK | To: ;gr=balcony | From: | Contact: ;gr=orchard | Call-ID: F6989A8C-DE8A-4E21-8E07-F0898304796F | CSeq: 1 BYE 5. Composing Events Both XMPP and MSRP enable a user agent to receive notifications when a person's conversation partner is composing an instant message within the context of a chat session. For XMPP, the Chat State Notifications specification [XEP-0085] defines five states: active, inactive, gone, composing, and paused. Some of these states are related to the act of message composition (composing, paused), whereas others are related to the sender's involvement with the chat session (active, inactive, gone). For MSRP (and SIMPLE in general), the Indication of Message Saint-Andre, et al. Expires March 23, 2014 [Page 11] Internet-Draft SIP-XMPP Interworking: Chat September 2013 Composition for Instant Messaging specification [RFC3994] defines two states: idle and active. Here the idle state indicates that the sender is not actively composing a message, and the active state indicates that the sender is indeed actively composing a message (the sending user agent simply toggles between the two states, changing to active if the user is actively composing a message and changing to idle if the user is no longer actively composing a message). Because the XEP-0085 states can represent information that is not captured in RFC 3994, gateways can either (a) map only the composing- related states or (b) map all the XEP-0085 states. The following mappings are suggested. Table 3: Mapping of SIMPLE isComposing events to XMPP chat states +-------------------+--------------------+ | isComposing Event | Chat State | +-------------------+--------------------+ | active | composing | | idle | active | +-------------------+--------------------+ Table 4: Mapping of XMPP chat states to SIMPLE isComposing events +-------------------+--------------------+ | Chat State | isComposing Event | +-------------------+--------------------+ | active | idle | | inactive | idle | | gone | [none, see note] | | composing | active | | paused | idle | +-------------------+--------------------+ Although there is no direct mapping for the "gone" chat state (which is not to be confused with the stanza error condition defined in [RFC6120]) to an isComposing event, receipt of the "gone" state can be used as a trigger for terminating the formal chat session within MSRP, i.e., for sending a SIP BYE for the session from the XMPP-SIP gateway to the SIP user. The following examples illustrate this indirect mapping. Saint-Andre, et al. Expires March 23, 2014 [Page 12] Internet-Draft SIP-XMPP Interworking: Chat September 2013 Example 19: Juliet sends gone chat state | | 29377446-0CBB-4296-8958-590D79094C50 | | Example 20: XMPP-SIP gateway maps gone chat state to SIP BYE | BYE romeo@example.net sip: SIP/2.0 | Max-Forwards: 70 | From: ;tag=786 | To: ;tag=087js | Call-ID: 29377446-0CBB-4296-8958-590D79094C50 | Cseq: 1 BYE | Content-Length: 0 6. Delivery Reports Both XMPP and MSRP enable a user agent to receive notifications when a message has been received by the intended recipient. For XMPP, the Message Receipts specification [XEP-0184] defines a method and XML namespace for requesting and returning indications that a message has been received by a client controlled by the intended recipient. For MSRP, a native reporting feature is included, in the form of report chunks (see Sections 7.1.2 and 7.1.3 of [RFC4975]). Examples follow. First, the XMPP user sends a message containing a request for delivery notification. Saint-Andre, et al. Expires March 23, 2014 [Page 13] Internet-Draft SIP-XMPP Interworking: Chat September 2013 Example 21: Juliet sends XMPP message with receipt request | | 29377446-0CBB-4296-8958-590D79094C50 | What man art thou ...? | | Example 22: Gateway maps XMPP message to MSRP | MSRP bf9m36d5 SEND | To-Path: msrp://s2x.example.net:7313/jshA7weztas;tcp | From-Path: msrp://x2s.example.com:8763/lkjh37s2s20w2a;tcp | Message-ID: 6187CF9B-317A-41DA-BB6A-5E48A9C794EF | Byte-Range: 1-25/25 | Success-Report: yes | Failure-Report: no | Content-Type: text/plain | | What man art thou ...? | -------bf9m36d5$ Next, the recipient returns a report. Example 23: Romeo returns MSRP receipt | MSRP hx74g336 REPORT | To-Path: msrp://x2s.example.com:8763/lkjh37s2s20w2a;tcp | From-Path: msrp://s2x.example.net:7313/jshA7weztas;tcp | Message-ID: 6187CF9B-317A-41DA-BB6A-5E48A9C794EF | Byte-Range: 1-106/106 | Status: 000 200 OK | -------hx74g336$ Example 24: SIP-XMPP gateway maps receipt to XMPP | | | Saint-Andre, et al. Expires March 23, 2014 [Page 14] Internet-Draft SIP-XMPP Interworking: Chat September 2013 7. IANA Considerations This document requests no actions of IANA. 8. Security Considerations Detailed security considerations for instant messaging protocols are given in [RFC2779], for SIP-based instant messaging in [RFC3428] (see also [RFC3261]), and for XMPP-based instant messaging in [RFC6121] (see also [RFC6120]). This document specifies methods for exchanging instant messages through a gateway that translates between SIP and XMPP. Such a gateway MUST be compliant with the minimum security requirements of the instant messaging protocols for which it translates (i.e., SIP and XMPP). The addition of gateways to the security model of instant messaging specified in [RFC2779] introduces some new risks. In particular, end-to-end security properties (especially confidentiality and integrity) between instant messaging user agents that interface through a SIMPLE-XMPP gateway can be provided only if common formats are supported. Specification of those common formats is out of scope for this document, although it is recommended to use [RFC3862] for instant messages. 9. References 9.1. Normative References [I-D.ietf-stox-core] Saint-Andre, P., Houri, A., and J. Hildebrand, "Interworking between the Session Initiation Protocol (SIP) and the Extensible Messaging and Presence Protocol (XMPP): Core", draft-ietf-stox-core-04 (work in progress), July 2013. [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, March 1997. [RFC3261] Rosenberg, J., Schulzrinne, H., Camarillo, G., Johnston, A., Peterson, J., Sparks, R., Handley, M., and E. Schooler, "SIP: Session Initiation Protocol", RFC 3261, June 2002. [RFC3862] Klyne, G. and D. Atkins, "Common Presence and Instant Messaging (CPIM): Message Format", RFC 3862, August 2004. Saint-Andre, et al. Expires March 23, 2014 [Page 15] Internet-Draft SIP-XMPP Interworking: Chat September 2013 [RFC3994] Schulzrinne, H., "Indication of Message Composition for Instant Messaging", RFC 3994, January 2005. [RFC4975] Campbell, B., Mahy, R., and C. Jennings, "The Message Session Relay Protocol (MSRP)", RFC 4975, September 2007. [RFC6120] Saint-Andre, P., "Extensible Messaging and Presence Protocol (XMPP): Core", RFC 6120, March 2011. [RFC6121] Saint-Andre, P., "Extensible Messaging and Presence Protocol (XMPP): Instant Messaging and Presence", RFC 6121, March 2011. [XEP-0085] Saint-Andre, P. and D. Smith, "Chat State Notifications", XSF XEP 0085, September 2009. [XEP-0184] Saint-Andre, P. and J. Hildebrand, "Message Delivery Receipts", XSF XEP 0184, March 2011. 9.2. Informative References [I-D.ietf-stox-im] Saint-Andre, P., Houri, A., and J. Hildebrand, "Interworking between the Session Initiation Protocol (SIP) and the Extensible Messaging and Presence Protocol (XMPP): Instant Messaging", draft-ietf-stox-im-03 (work in progress), September 2013. [RFC2779] Day, M., Aggarwal, S., and J. Vincent, "Instant Messaging / Presence Protocol Requirements", RFC 2779, February 2000. [RFC3428] Campbell, B., Rosenberg, J., Schulzrinne, H., Huitema, C., and D. Gurle, "Session Initiation Protocol (SIP) Extension for Instant Messaging", RFC 3428, December 2002. Appendix A. Acknowledgements Some text in this document was borrowed from [I-D.ietf-stox-core]. Thanks to Adrian Georgescu, Philipp Hancke, Saul Ibarra Corretge, and Tory Patnoe for their feedback. Saint-Andre, et al. Expires March 23, 2014 [Page 16] Internet-Draft SIP-XMPP Interworking: Chat September 2013 Authors' Addresses Peter Saint-Andre Cisco Systems, Inc. 1899 Wynkoop Street, Suite 600 Denver, CO 80202 USA Phone: +1-303-308-3282 Email: psaintan@cisco.com Salvatore Loreto Ericsson Hirsalantie 11 Jorvas 02420 Finland Email: Salvatore.Loreto@ericsson.com Eddy Gavita Ericsson Decarie Boulevard Town of Mount Royal, Quebec Canada Email: eddy.gavita@ericsson.com Nazin Hossain Ericsson Decarie Boulevard Town of Mount Royal, Quebec Canada Email: Nazin.Hossain@ericsson.com Saint-Andre, et al. Expires March 23, 2014 [Page 17]