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Connection Establishment for Media Anchoring (CEMA) for the Message Session Relay Protocol (MSRP)
RFC 6714

Internet Engineering Task Force (IETF)                       C. Holmberg
Request for Comments: 6714                                       S. Blau
Category: Standards Track                                       Ericsson
ISSN: 2070-1721                                                E. Burger
                                                   Georgetown University
                                                             August 2012

          Connection Establishment for Media Anchoring (CEMA)
             for the Message Session Relay Protocol (MSRP)

Abstract

   This document defines a Message Session Relay Protocol (MSRP)
   extension, Connection Establishment for Media Anchoring (CEMA).
   Support of this extension is OPTIONAL.  The extension allows
   middleboxes to anchor the MSRP connection, without the need for
   middleboxes to modify the MSRP messages; thus, it also enables secure
   end-to-end MSRP communication in networks where such middleboxes are
   deployed.  This document also defines a Session Description Protocol
   (SDP) attribute, 'msrp-cema', that MSRP endpoints use to indicate
   support of the CEMA extension.

Status of This Memo

   This is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Further information on
   Internet Standards is available in Section 2 of RFC 5741.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   http://www.rfc-editor.org/info/rfc6714.

Holmberg, et al.             Standards Track                    [Page 1]
RFC 6714                        MSRP-CEMA                    August 2012

Copyright Notice

   Copyright (c) 2012 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
   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.

Holmberg, et al.             Standards Track                    [Page 2]
RFC 6714                        MSRP-CEMA                    August 2012

Table of Contents

   1. Introduction ....................................................3
   2. Conventions .....................................................5
   3. Applicability Statement .........................................6
   4. Connection Establishment for Media Anchoring Mechanism ..........7
      4.1. General ....................................................7
      4.2. MSRP SDP Offerer Procedures ................................8
      4.3. MSRP SDP Answerer Procedures ...............................9
      4.4. Address Information Matching ..............................11
      4.5. Usage with the Alternative Connection Model ...............12
   5. The SDP 'msrp-cema' Attribute ..................................12
      5.1. General ...................................................12
      5.2. Syntax ....................................................12
   6. Middlebox Assumptions ..........................................13
      6.1. General ...................................................13
      6.2. MSRP Awareness ............................................13
      6.3. TCP Connection Reuse ......................................13
      6.4. SDP Integrity .............................................14
      6.5. TLS .......................................................14
   7. Security Considerations ........................................14
      7.1. General ...................................................14
      7.2. Man-in-the-Middle (MITM) Attacks ..........................15
      7.3. TLS Usage without Middleboxes .............................16
      7.4. TLS Usage with Middleboxes ................................16
      7.5. Authentication, Credentials, and Key Management ...........16
      7.6. Endpoint Procedures for TLS Negotiation ...................17
      7.7. Fingerprint-Based Authentication ..........................18
   8. IANA Considerations ............................................19
      8.1. IANA Registration of the SDP 'msrp-cema' Attribute ........19

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