Connection-Oriented Media Transport over the Transport Layer Security (TLS) Protocol in the Session Description Protocol (SDP)
RFC 8122

Document Type RFC - Proposed Standard (March 2017; No errata)
Obsoletes RFC 4572
Last updated 2017-03-17
Stream IETF
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Stream WG state Submitted to IESG for Publication
Document shepherd Flemming Andreasen
Shepherd write-up Show (last changed 2017-01-06)
IESG IESG state RFC 8122 (Proposed Standard)
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Send notices to "Flemming Andreasen" <fandreas@cisco.com>
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Internet Engineering Task Force (IETF)                         J. Lennox
Request for Comments: 8122                                         Vidyo
Obsoletes: 4572                                              C. Holmberg
Category: Standards Track                                       Ericsson
ISSN: 2070-1721                                               March 2017

                Connection-Oriented Media Transport over
              the Transport Layer Security (TLS) Protocol
               in the Session Description Protocol (SDP)

Abstract

   This document specifies how to establish secure connection-oriented
   media transport sessions over the Transport Layer Security (TLS)
   protocol using the Session Description Protocol (SDP).  It defines
   the SDP protocol identifier, 'TCP/TLS'.  It also defines the syntax
   and semantics for an SDP 'fingerprint' attribute that identifies the
   certificate that will be presented for the TLS session.  This
   mechanism allows media transport over TLS connections to be
   established securely, so long as the integrity of session
   descriptions is assured.

   This document obsoletes RFC 4572 by clarifying the usage of multiple
   fingerprints.

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 7841.

   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/rfc8122.

Lennox & Holmberg            Standards Track                    [Page 1]
RFC 8122                 Comedia over TLS in SDP              March 2017

Copyright Notice

   Copyright (c) 2017 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.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  Changes from RFC 4572 . . . . . . . . . . . . . . . . . .   4
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   4
   3.  Overview  . . . . . . . . . . . . . . . . . . . . . . . . . .   4
     3.1.  SDP Operational Modes . . . . . . . . . . . . . . . . . .   4
     3.2.  Threat Model  . . . . . . . . . . . . . . . . . . . . . .   5
     3.3.  The Need for Self-Signed Certificates . . . . . . . . . .   6
     3.4.  Example SDP Description for TLS Connection  . . . . . . .   6
   4.  Protocol Identifiers  . . . . . . . . . . . . . . . . . . . .   7
   5.  Fingerprint Attribute . . . . . . . . . . . . . . . . . . . .   7
     5.1.  Multiple Fingerprints . . . . . . . . . . . . . . . . . .   9
   6.  Endpoint Identification . . . . . . . . . . . . . . . . . . .  10
     6.1.  Certificate Choice  . . . . . . . . . . . . . . . . . . .  10
     6.2.  Certificate Presentation  . . . . . . . . . . . . . . . .  11
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .  12
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  14
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  15
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .  15
     9.2.  Informative References  . . . . . . . . . . . . . . . . .  16
   Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . .  18
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  18

Lennox & Holmberg            Standards Track                    [Page 2]
RFC 8122                 Comedia over TLS in SDP              March 2017

1.  Introduction

   The Session Description Protocol (SDP) [8] provides a general-purpose
   format for describing multimedia sessions in announcements or
   invitations.  For many applications, it is desirable to establish, as
   part of a multimedia session, a media stream that uses a connection-
   oriented transport.  RFC 4145, "TCP-Based Media Transport in the
   Session Description Protocol (SDP)" [7], specifies a general
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