The Token Binding Protocol Version 1.0
draft-ietf-tokbind-protocol-13

Document Type Active Internet-Draft (tokbind WG)
Last updated 2017-02-16
Replaces draft-popov-token-binding
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Internet Engineering Task Force                            A. Popov, Ed.
Internet-Draft                                               M. Nystroem
Intended status: Standards Track                         Microsoft Corp.
Expires: August 20, 2017                                      D. Balfanz
                                                              A. Langley
                                                             Google Inc.
                                                               J. Hodges
                                                                  Paypal
                                                       February 16, 2017

                 The Token Binding Protocol Version 1.0
                     draft-ietf-tokbind-protocol-13

Abstract

   This document specifies Version 1.0 of the Token Binding protocol.
   The Token Binding protocol allows client/server applications to
   create long-lived, uniquely identifiable TLS [RFC5246] bindings
   spanning multiple TLS sessions and connections.  Applications are
   then enabled to cryptographically bind security tokens to the TLS
   layer, preventing token export and replay attacks.  To protect
   privacy, the Token Binding identifiers are only conveyed over TLS and
   can be reset by the user at any time.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
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   This Internet-Draft will expire on August 20, 2017.

Copyright Notice

   Copyright (c) 2017 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Popov, et al.            Expires August 20, 2017                [Page 1]
Internet-Draft   The Token Binding Protocol Version 1.0    February 2017

   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
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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Requirements Language . . . . . . . . . . . . . . . . . .   3
   2.  Token Binding Protocol Overview . . . . . . . . . . . . . . .   3
   3.  Token Binding Protocol Message  . . . . . . . . . . . . . . .   4
     3.1.  TokenBinding.tokenbinding_type  . . . . . . . . . . . . .   6
     3.2.  TokenBinding.tokenbindingid . . . . . . . . . . . . . . .   6
     3.3.  TokenBinding.signature  . . . . . . . . . . . . . . . . .   7
     3.4.  TokenBinding.extensions . . . . . . . . . . . . . . . . .   8
   4.  Establishing a Token Binding  . . . . . . . . . . . . . . . .   9
     4.1.  Client Processing Rules . . . . . . . . . . . . . . . . .   9
     4.2.  Server Processing Rules . . . . . . . . . . . . . . . . .   9
   5.  Bound Security Token Creation and Validation  . . . . . . . .  10
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  11
     6.1.  Token Binding Key Parameters Registry . . . . . . . . . .  11
     6.2.  Token Binding Types Registry  . . . . . . . . . . . . . .  12
     6.3.  Token Binding Extensions Registry . . . . . . . . . . . .  13
     6.4.  Registration of Token Binding TLS Exporter Label  . . . .  13
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .  13
     7.1.  Security Token Replay . . . . . . . . . . . . . . . . . .  13
     7.2.  Downgrade Attacks . . . . . . . . . . . . . . . . . . . .  14
     7.3.  Privacy Considerations  . . . . . . . . . . . . . . . . .  14
     7.4.  Token Binding Key Sharing Between Applications  . . . . .  14
     7.5.  Triple Handshake Vulnerability in TLS 1.2 and Older TLS
           Versions  . . . . . . . . . . . . . . . . . . . . . . . .  15
   8.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  15
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  15
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .  15
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