Transport Layer Security (TLS) Application-Layer Protocol Negotiation Extension
RFC 7301

 
Document Type RFC - Proposed Standard (July 2014; No errata)
Last updated 2014-07-11
Replaces draft-friedl-tls-applayerprotoneg
Stream IETF
Formats plain text pdf html
Stream WG state Submitted to IESG for Publication
Consensus Yes
Document shepherd J. Salowey
Shepherd write-up Show (last changed 2014-02-02)
IESG IESG state RFC 7301 (Proposed Standard)
Telechat date
Responsible AD Stephen Farrell
Send notices to tls-chairs@ietf.org, draft-ietf-tls-applayerprotoneg@ietf.org
IANA IANA review state Version Changed - Review Needed
IANA action state RFC-Ed-Ack
Internet Engineering Task Force (IETF)                         S. Friedl
Request for Comments: 7301                           Cisco Systems, Inc.
Category: Standards Track                                       A. Popov
ISSN: 2070-1721                                          Microsoft Corp.
                                                              A. Langley
                                                             Google Inc.
                                                              E. Stephan
                                                                  Orange
                                                               July 2014

                     Transport Layer Security (TLS)
            Application-Layer Protocol Negotiation Extension

Abstract

   This document describes a Transport Layer Security (TLS) extension
   for application-layer protocol negotiation within the TLS handshake.
   For instances in which multiple application protocols are supported
   on the same TCP or UDP port, this extension allows the application
   layer to negotiate which protocol will be used within the TLS
   connection.

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/rfc7301.

Friedl, et al.               Standards Track                    [Page 1]
RFC 7301         TLS App-Layer Protocol Negotiation Ext        July 2014

Copyright Notice

   Copyright (c) 2014 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  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Requirements Language . . . . . . . . . . . . . . . . . . . .   3
   3.  Application-Layer Protocol Negotiation  . . . . . . . . . . .   3
     3.1.  The Application-Layer Protocol Negotiation Extension  . .   3
     3.2.  Protocol Selection  . . . . . . . . . . . . . . . . . . .   5
   4.  Design Considerations . . . . . . . . . . . . . . . . . . . .   6
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   6
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   7
   7.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   8
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   8
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .   8
     8.2.  Informative References  . . . . . . . . . . . . . . . . .   8

1.  Introduction

   Increasingly, application-layer protocols are encapsulated in the TLS
   protocol [RFC5246].  This encapsulation enables applications to use
   the existing, secure communications links already present on port 443
   across virtually the entire global IP infrastructure.

   When multiple application protocols are supported on a single server-
   side port number, such as port 443, the client and the server need to
   negotiate an application protocol for use with each connection.  It
   is desirable to accomplish this negotiation without adding network
   round-trips between the client and the server, as each round-trip
   will degrade an end-user's experience.  Further, it would be
   advantageous to allow certificate selection based on the negotiated
   application protocol.

Friedl, et al.               Standards Track                    [Page 2]
RFC 7301         TLS App-Layer Protocol Negotiation Ext        July 2014

   This document specifies a TLS extension that permits the application
   layer to negotiate protocol selection within the TLS handshake.  This
   work was requested by the HTTPbis WG to address the negotiation of
   HTTP/2 ([HTTP2]) over TLS; however, ALPN facilitates negotiation of
   arbitrary application-layer protocols.

   With ALPN, the client sends the list of supported application
Show full document text