The Token Binding Protocol Version 1.0
draft-ietf-tokbind-protocol-07

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Document Type Active Internet-Draft (tokbind WG)
Last updated 2016-07-07
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: January 8, 2017                                      D. Balfanz
                                                              A. Langley
                                                             Google Inc.
                                                               J. Hodges
                                                                  Paypal
                                                            July 7, 2016

                 The Token Binding Protocol Version 1.0
                     draft-ietf-tokbind-protocol-07

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 TLS Token Binding identifiers are only transmitted
   encrypted 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 January 8, 2017.

Copyright Notice

   Copyright (c) 2016 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Popov, et al.            Expires January 8, 2017                [Page 1]
Internet-Draft   The Token Binding Protocol Version 1.0        July 2016

   This document is subject to BCP 78 and the IETF Trust's Legal
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Requirements Language . . . . . . . . . . . . . . . . . .   3
   2.  Token Binding Protocol Overview . . . . . . . . . . . . . . .   3
   3.  Token Binding Protocol Message  . . . . . . . . . . . . . . .   4
   4.  Establishing a TLS Token Binding  . . . . . . . . . . . . . .   7
     4.1.  Client Processing Rules . . . . . . . . . . . . . . . . .   7
     4.2.  Server Processing Rules . . . . . . . . . . . . . . . . .   7
   5.  TLS Token Binding ID Format . . . . . . . . . . . . . . . . .   8
   6.  Security Token Validation . . . . . . . . . . . . . . . . . .   9
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  10
     7.1.  Token Binding Key Parameters Registry . . . . . . . . . .  10
     7.2.  Token Binding Types Registry  . . . . . . . . . . . . . .  11
     7.3.  Token Binding Extensions Registry . . . . . . . . . . . .  11
     7.4.  Registration of Token Binding TLS Exporter Label  . . . .  12
   8.  Security Considerations . . . . . . . . . . . . . . . . . . .  12
     8.1.  Security Token Replay . . . . . . . . . . . . . . . . . .  12
     8.2.  Downgrade Attacks . . . . . . . . . . . . . . . . . . . .  12
     8.3.  Privacy Considerations  . . . . . . . . . . . . . . . . .  13
     8.4.  Token Binding Key Sharing Between Applications  . . . . .  13
     8.5.  Triple Handshake Vulnerability in TLS 1.2 and Older TLS
           Versions  . . . . . . . . . . . . . . . . . . . . . . . .  13
   9.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  14
   10. References  . . . . . . . . . . . . . . . . . . . . . . . . .  14
     10.1.  Normative References . . . . . . . . . . . . . . . . . .  14
     10.2.  Informative References . . . . . . . . . . . . . . . . .  15
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  15

1.  Introduction

   Servers generate various security tokens (e.g.  HTTP cookies, OAuth
   tokens) for applications to access protected resources.  Any party in
   possession of such token gains access to the protected resource.
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