HTTPS Token Binding with TLS Terminating Reverse Proxies
draft-ietf-tokbind-ttrp-07

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Internet Engineering Task Force                              B. Campbell
Internet-Draft                                             Ping Identity
Intended status: Standards Track                        October 19, 2018
Expires: April 22, 2019

        HTTPS Token Binding with TLS Terminating Reverse Proxies
                       draft-ietf-tokbind-ttrp-07

Abstract

   This document defines HTTP header fields that enable a TLS
   terminating reverse proxy to convey information to a backend server
   about the validated Token Binding Message received from a client,
   which enables that backend server to bind, or verify the binding of,
   cookies and other security tokens to the client's Token Binding key.
   This facilitates the reverse proxy and backend server functioning
   together as though they are a single logical server side deployment
   of HTTPS Token Binding.

Status of This Memo

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

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   This Internet-Draft will expire on April 22, 2019.

Copyright Notice

   Copyright (c) 2018 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
   (https://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

Campbell                 Expires April 22, 2019                 [Page 1]
Internet-Draft      Token Binding and TLS Termination       October 2018

   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
     1.1.  Requirements Notation and Conventions . . . . . . . . . .   3
   2.  HTTP Header Fields and Processing Rules . . . . . . . . . . .   3
     2.1.  Encoding  . . . . . . . . . . . . . . . . . . . . . . . .   4
       2.1.1.  Token Binding ID  . . . . . . . . . . . . . . . . . .   4
       2.1.2.  Token Binding Type  . . . . . . . . . . . . . . . . .   4
     2.2.  Token Binding ID HTTP Header Fields . . . . . . . . . . .   4
     2.3.  Processing Rules  . . . . . . . . . . . . . . . . . . . .   5
     2.4.  Examples  . . . . . . . . . . . . . . . . . . . . . . . .   6
       2.4.1.  Provided Token Binding ID . . . . . . . . . . . . . .   6
       2.4.2.  Provided and Referred Token Binding IDs . . . . . . .   7
       2.4.3.  Provided and Other  Token Binding IDs . . . . . . . .   8
   3.  TLS Versions and Best Practices . . . . . . . . . . . . . . .   8
   4.  Security Considerations . . . . . . . . . . . . . . . . . . .   9
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   9
     5.1.  HTTP Message Header Field Names Registration  . . . . . .  10
   6.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  10
     6.1.  Normative References  . . . . . . . . . . . . . . . . . .  10
     6.2.  Informative References  . . . . . . . . . . . . . . . . .  11
   Appendix A.  Acknowledgements . . . . . . . . . . . . . . . . . .  12
   Appendix B.  Document History . . . . . . . . . . . . . . . . . .  12
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .  14

1.  Introduction

   Token Binding over HTTP [RFC8473] provides a mechanism that enables
   HTTP servers to cryptographically bind cookies and other security
   tokens to a key generated by the client.  When the use of Token
   Binding is negotiated in the TLS [RFC5246] handshake [RFC8472] the
   client sends an encoded Token Binding Message [RFC8471] as a header
   in each HTTP request, which proves possession of one or more private
   keys held by the client.  The public portion of the keys are
   represented in the Token Binding IDs of the Token Binding Message and
   for each one there is a signature over some data, which includes the
   exported keying material [RFC5705] of the TLS connection.  An HTTP
   server issuing cookies or other security tokens can associate them
   with the Token Binding ID, which ensures those tokens cannot be used
   successfully over a different TLS connection or by a different client