Token Binding over HTTP
draft-ietf-tokbind-https-00

The information below is for an old version of the document
Document Type Active Internet-Draft (tokbind WG)
Authors Andrei Popov  , Magnus Nystrom  , Dirk Balfanz  , Adam Langley 
Last updated 2015-03-27
Replaces draft-balfanz-https-token-binding
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Internet Engineering Task Force                                 A. Popov
Internet-Draft                                               M. Nystroem
Intended status: Standards Track                         Microsoft Corp.
Expires: September 28, 2015                              D. Balfanz, Ed.
                                                              A. Langley
                                                             Google Inc.
                                                          March 27, 2015

                        Token Binding over HTTP
                      draft-ietf-tokbind-https-00

Abstract

   This document describes a collection of mechanisms that allow HTTP
   servers to cryptographically bind authentication tokens (such as
   cookies and OAuth tokens) to a TLS [RFC5246] connection.

   We describe both _first-party_ as well as _federated_ scenarios.  In
   a first-party scenario, an HTTP server issues a security token (such
   as a cookie) to a client, and expects the client to send the security
   token back to the server at a later time in order to authenticate.
   Binding the token to the TLS connection between client and server
   protects the security token from theft, and ensures that the security
   token can only be used by the client that it was issued to.

   Federated token bindings, on the other hand, allow servers to
   cryptographically bind security tokens to a TLS [RFC5246] connection
   that the client has with a _different_ server than the one issuing
   the token.

   This Internet-Draft is a companion document to The Token Binding
   Protocol [TBPROTO]

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
   Task Force (IETF).  Note that other groups may also distribute
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   Drafts is at http://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

Popov, et al.          Expires September 28, 2015               [Page 1]
Internet-Draft           Token Binding over HTTP              March 2015

   This Internet-Draft will expire on September 28, 2015.

Copyright Notice

   Copyright (c) 2015 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
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   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 Language . . . . . . . . . . . . . . . . . .   3
   2.  The Token-Binding Header  . . . . . . . . . . . . . . . . . .   3
   3.  Federation Use Cases  . . . . . . . . . . . . . . . . . . . .   4
     3.1.  Introduction  . . . . . . . . . . . . . . . . . . . . . .   4
     3.2.  Overview  . . . . . . . . . . . . . . . . . . . . . . . .   4
     3.3.  HTTP Redirects  . . . . . . . . . . . . . . . . . . . . .   5
     3.4.  Cross-Origin Resource Sharing . . . . . . . . . . . . . .   6
     3.5.  Negotiated Key Parameters . . . . . . . . . . . . . . . .   7
   4.  Security Considerations . . . . . . . . . . . . . . . . . . .   7
     4.1.  Security Token Replay . . . . . . . . . . . . . . . . . .   7
     4.2.  Privacy Considerations  . . . . . . . . . . . . . . . . .   7
     4.3.  Triple Handshake Vulnerability in TLS . . . . . . . . . .   8
   5.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   8
     5.1.  Normative References  . . . . . . . . . . . . . . . . . .   8
     5.2.  Informative References  . . . . . . . . . . . . . . . . .   9
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   9

1.  Introduction

   The Token Binding Protocol [TBPROTO] defines a Token Binding ID for a
   TLS connection between a client and a server.  The Token Binding ID
   of a TLS connection is related to a private key that the client
   proves possession of to the server, and is long-lived (i.e.,
   subsequent TLS connections between the same client and server have
   the same Token Binding ID).  When issuing a security token (e.g. an
   HTTP cookie or an OAuth token) to a client, the server can include
   the Token Binding ID in the token, thus cryptographically binding the
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