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; Errata)
Obsoletes RFC 4572
|
|
|---|---|---|---|
| Last updated | 2020-01-21 | ||
| Stream | IETF | ||
| Formats | plain text html pdf htmlized with errata bibtex | ||
| Reviews | |||
| 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) | |
| Consensus Boilerplate | Yes | ||
| Telechat date | |||
| Responsible AD | Ben Campbell | ||
| Send notices to | "Flemming Andreasen" <fandreas@cisco.com> | ||
| IANA | IANA review state | Version Changed - Review Needed | |
| IANA action state | RFC-Ed-Ack | ||
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
mechanism for describing and establishing such connection-oriented
streams; however, the only transport protocol it directly supports is
TCP. In many cases, session participants wish to provide
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