Channel Bindings for TLS
RFC 5929

• Status
• IESG evaluation record
• IESG writeups
• Email expansions
• History

• Versions
• 10

Internet Engineering Task Force (IETF)                         J. Altman
Request for Comments: 5929                              Secure Endpoints
Category: Standards Track                                    N. Williams
ISSN: 2070-1721                                                   Oracle
                                                                  L. Zhu
                                                   Microsoft Corporation
                                                               July 2010

                        Channel Bindings for TLS

Abstract

   This document defines three channel binding types for Transport Layer
   Security (TLS), tls-unique, tls-server-end-point, and tls-unique-for-
   telnet, in accordance with RFC 5056 (On Channel Binding).

   Note that based on implementation experience, this document changes
   the original definition of 'tls-unique' channel binding type in the
   channel binding type IANA registry.

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/rfc5929.

Copyright Notice

   Copyright (c) 2010 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.

Altman, et al.               Standards Track                    [Page 1]
RFC 5929                  TLS Channel Bindings                 July 2010

   This document may contain material from IETF Documents or IETF
   Contributions published or made publicly available before November
   10, 2008.  The person(s) controlling the copyright in some of this
   material may not have granted the IETF Trust the right to allow
   modifications of such material outside the IETF Standards Process.
   Without obtaining an adequate license from the person(s) controlling
   the copyright in such materials, this document may not be modified
   outside the IETF Standards Process, and derivative works of it may
   not be created outside the IETF Standards Process, except to format
   it for publication as an RFC or to translate it into languages other
   than English.

Table of Contents

   1. Introduction ....................................................3
   2. Conventions Used in This Document ...............................3
   3. The 'tls-unique' Channel Binding Type ...........................3
      3.1. Description ................................................3
      3.2. Registration ...............................................4
   4. The 'tls-server-end-point' Channel Binding Type .................5
      4.1. Description ................................................5
      4.2. Registration ...............................................6
   5. The 'tls-unique-for-telnet' Channel Binding Type ................6
      5.1. Description ................................................7
      5.2. Registration ...............................................7
   6. Applicability of TLS Channel Binding Types ......................7
   7. Required Application Programming Interfaces ....................10
   8. Description of Backwards-Incompatible Changes Made
      Herein to 'tls-unique' .........................................10
   9. IANA Considerations ............................................11
   10. Security Considerations .......................................11
      10.1. Cryptographic Algorithm Agility ..........................12
      10.2. On Disclosure of Channel Bindings Data by
            Authentication Mechanisms ................................12
   11. References ....................................................13
      11.1. Normative References .....................................13
      11.2. Informative References ...................................14

Altman, et al.               Standards Track                    [Page 2]
RFC 5929                  TLS Channel Bindings                 July 2010

1.  Introduction

   Subsequent to the publication of "On Channel Bindings" [RFC5056],