Network Working Group L. Dondeti, Ed. Internet-Draft QUALCOMM, Inc. Expires: November 24, 2006 D. Castleford Orange FT F. Hartung Ericsson Research May 23, 2006 OMA BCAST MIKEY General Extension Payload Specification draft-dondeti-msec-mikey-genext-oma-01 Status of this Memo By submitting this Internet-Draft, each author represents that any applicable patent or other IPR claims of which he or she is aware have been or will be disclosed, and any of which he or she becomes aware will be disclosed, in accordance with Section 6 of BCP 79. Internet-Drafts are working documents of the Internet Engineering Task Force (IETF), its areas, and its working groups. Note that other groups may also distribute working documents as Internet- Drafts. 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." The list of current Internet-Drafts can be accessed at http://www.ietf.org/ietf/1id-abstracts.txt. The list of Internet-Draft Shadow Directories can be accessed at http://www.ietf.org/shadow.html. This Internet-Draft will expire on November 24, 2006. Copyright Notice Copyright (C) The Internet Society (2006). Abstract This document specifies a new General Extension payload type for use in the Open Mobile Alliance's (OMA) Browser and Content (BAC) Broadcast (BCAST) group. OMA BCAST's service and content protection specification uses short term key message (STKM) and long term key message (LTKM) payloads that in certain broadcast distribution Dondeti, et al. Expires November 24, 2006 [Page 1] Internet-Draft OMA BCAST MIKEY General Extension Payload May 2006 systems (BDS) are carried in the IETF MIKEY protocol [1]. A new MIKEY General Extension payload specified in this document will be used for that purpose. Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3 2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . . 3 3. MIKEY General Extension Payload for OMA BCAST Usage . . . . . . 3 4. Interoperability considerations . . . . . . . . . . . . . . . . 4 5. Security Considerations . . . . . . . . . . . . . . . . . . . . 4 6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 5 7. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . 5 8. Normative References . . . . . . . . . . . . . . . . . . . . . 5 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 6 Intellectual Property and Copyright Statements . . . . . . . . . . 7 Dondeti, et al. Expires November 24, 2006 [Page 2] Internet-Draft OMA BCAST MIKEY General Extension Payload May 2006 1. Introduction The Multimedia Internet Keying (MIKEY) protocol specification [1] defines a General Extension payload to allow possible extensions to MIKEY without having to define new payloads. The General Extension payload can be used in any MIKEY message and is part of the authenticated/signed data part. There is an 8-bit type field in that payload and the type code assignment is IANA managed and RFC 3830 requires IETF consensus for assignments from the public range of 0-240. The Open Mobile Alliance's (OMA) Browser and Content (BAC) Broadcast (BCAST) group's Service and Content Protection specification [2] specifies the use of a short term key message (STKM) and a long term key message (LTKM) that carry attributes related to service and content protection. Note that any keys associated with the attributes are part of the MIKEY KEMAC payload. This document specifies the use of the General Extension payload of MIKEY to carry the LTKMs or STKMs. RFC 3830, the MIKEY General Extension payload specified in [3] along with the 3rd Generation Partnership Project (3GPP)'s Multimedia Broadcast/Multicast Service (MBMS) [4] specification specify the transport of MIKEY messages via unicast or broadcast and the OMA specifications use either for transport of MIKEY messages. 2. Terminology The keywords "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in RFC-2119 [5]. OMA BCAST MIKEY General Extension payload: We refer to the General Extension payload type -- value, to be assigned by IANA -- as the OMA BCAST MIKEY General Extension payload. 3. MIKEY General Extension Payload for OMA BCAST Usage Dondeti, et al. Expires November 24, 2006 [Page 3] Internet-Draft OMA BCAST MIKEY General Extension Payload May 2006 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ ! Next payload ! Type ! Length ! +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ ! OMA BCAST S/LTKM specific data (variable length) ~ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ Figure 1: OMA BCAST MIKEY General Extension Payload Section 6.1 of RFC 3830 specifies the first three fields of the General Extension Payload and defines a variable length Data field. This specification requests a Type value to be assigned for the OMA BCAST MIKEY General Extension payload. The data field is opaque to the IETF and is specified in the OMA BCAST Service and Content Protection specification [2]. The plan is to define an 8-bit type value to indicate STKM or LTKM and include all the STKM and LTKM fields as specified in [2]. 4. Interoperability considerations This document requests a MIKEY [1] General Extension Payload Type number from IANA through IETF review. The payload defined is relevant to the 3GPP MBMS adaptation of the OMA BCAST 1.0 specification. Interoperability considerations span at least 3 SDOs and as such it is up to the OMA test planning to verify the interoperability of the MBMS adaptation of OMA BCAST 1.0. This payload type assignment does not change MIKEY beyond RFC 3830 and [3]. 5. Security Considerations According to RFC 3830, the general extension payload can be used in any MIKEY message and is part of the authenticated/signed data part. The parameters proposed to be included in the OMA BCAST MIKEY General Extension payload (listed in Section Section 3) need only to be integrity protected, which is already allowed by the MIKEY specification. The OMA BCAST MIKEY General Extension Payload SHALL be integrity protected. Furthermore, keys or any parameters that require confidentiality MUST NOT be included in the General Extension Payload. Note that MIKEY already provides replay protection and that protection covers the General Extension Payload also. Dondeti, et al. Expires November 24, 2006 [Page 4] Internet-Draft OMA BCAST MIKEY General Extension Payload May 2006 6. IANA Considerations Please provide the next available number from the "General Extensions payload name spaces" in the IANA registry at http://www.iana.org/assignments/mikey-payloads for use by OMA BCAST GenExt payload. 7. Acknowledgments Many thanks to Piron Laurent and Steffen Fries for their reviews. 8. Normative References [1] Arkko, J., Carrara, E., Lindholm, F., Naslund, M., and K. Norrman, "MIKEY: Multimedia Internet KEYing", RFC 3830, August 2004. [2] Open Mobile Alliance, "Service and Content Protection for Mobile Broadcast Services", OMA TS-BCAST-SvcCntProtection-V1_0- 20060412-D, 2006. [3] Carrara, E., "The Key ID Information Type for the General Extension Payload in MIKEY", draft-ietf-msec-newtype-keyid-05 (work in progress), March 2006. [4] 3GPP, "3G Security; Security of Multimedia Broadcast/Multicast Service (MBMS)", 3GPP TS 33.246 6.6.0, March 2006. [5] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, March 1997. Dondeti, et al. Expires November 24, 2006 [Page 5] Internet-Draft OMA BCAST MIKEY General Extension Payload May 2006 Authors' Addresses Lakshminath Dondeti (editor) QUALCOMM, Inc. 5775 Morehouse Dr San Diego, CA USA Phone: +1 858-845-1267 Email: ldondeti@qualcomm.com David Castleford Orange FT 4, rue du Clos Courtel 35512 Cesson Sevigne Cedex, France Phone: + 33 (0)2 99 12 49 27 Email: david.castleford@francetelecom.com Frank Hartung Ericsson Research Ericsson Allee 1 52134 Herzogenrath, Germany Phone: +49 2407 575389 Email: frank.hartung@ericsson.com Dondeti, et al. Expires November 24, 2006 [Page 6] Internet-Draft OMA BCAST MIKEY General Extension Payload May 2006 Intellectual Property Statement The IETF takes no position regarding the validity or scope of any Intellectual Property Rights or other rights that might be claimed to pertain to the implementation or use of the technology described in this document or the extent to which any license under such rights might or might not be available; nor does it represent that it has made any independent effort to identify any such rights. Information on the procedures with respect to rights in RFC documents can be found in BCP 78 and BCP 79. Copies of IPR disclosures made to the IETF Secretariat and any assurances of licenses to be made available, or the result of an attempt made to obtain a general license or permission for the use of such proprietary rights by implementers or users of this specification can be obtained from the IETF on-line IPR repository at http://www.ietf.org/ipr. 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Acknowledgment Funding for the RFC Editor function is currently provided by the Internet Society. Dondeti, et al. Expires November 24, 2006 [Page 7]