OAuth 2.0 Token Binding
draft-ietf-oauth-token-binding-04
OAuth Working Group M. Jones
Internet-Draft Microsoft
Intended status: Standards Track J. Bradley
Expires: January 4, 2018 B. Campbell
Ping Identity
W. Denniss
Google
July 3, 2017
OAuth 2.0 Token Binding
draft-ietf-oauth-token-binding-04
Abstract
This specification enables OAuth 2.0 implementations to apply Token
Binding to Access Tokens, Authorization Codes, and Refresh Tokens.
This cryptographically binds these tokens to a client's Token Binding
key pair, possession of which is proven on the TLS connections over
which the tokens are intended to be used. This use of Token Binding
protects these tokens from man-in-the-middle and token export and
replay attacks.
Status of This Memo
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provisions of BCP 78 and BCP 79.
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material or to cite them other than as "work in progress."
This Internet-Draft will expire on January 4, 2018.
Copyright Notice
Copyright (c) 2017 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
Jones, et al. Expires January 4, 2018 [Page 1]
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1. Requirements Notation and Conventions . . . . . . . . . . 3
1.2. Terminology . . . . . . . . . . . . . . . . . . . . . . . 3
2. Token Binding for Refresh Tokens . . . . . . . . . . . . . . 3
2.1. Example Token Binding for Refresh Tokens . . . . . . . . 4
3. Token Binding for Access Tokens . . . . . . . . . . . . . . . 6
3.1. Access Tokens Issued from the Authorization Endpoint . . 7
3.1.1. Example Access Token Issued from the Authorization
Endpoint . . . . . . . . . . . . . . . . . . . . . . 8
3.2. Access Tokens Issued from the Token Endpoint . . . . . . 9
3.2.1. Example Access Token Issued from the Token Endpoint . 9
3.3. Protected Resource Token Binding Validation . . . . . . . 11
3.3.1. Example Protected Resource Request . . . . . . . . . 11
3.4. Representing Token Binding in JWT Access Tokens . . . . . 11
3.5. Representing Token Binding in Introspection Responses . . 12
4. Token Binding for Authorization Codes . . . . . . . . . . . . 13
4.1. Native Application Clients . . . . . . . . . . . . . . . 13
4.1.1. Code Challenge . . . . . . . . . . . . . . . . . . . 14
4.1.1.1. Example Code Challenge . . . . . . . . . . . . . 14
4.1.2. Code Verifier . . . . . . . . . . . . . . . . . . . . 14
4.1.2.1. Example Code Verifier . . . . . . . . . . . . . . 15
4.2. Web Server Clients . . . . . . . . . . . . . . . . . . . 15
4.2.1. Code Challenge . . . . . . . . . . . . . . . . . . . 16
4.2.1.1. Example Code Challenge . . . . . . . . . . . . . 16
4.2.2. Code Verifier . . . . . . . . . . . . . . . . . . . . 17
4.2.2.1. Example Code Verifier . . . . . . . . . . . . . . 18
5. Phasing in Token Binding and Preventing Downgrade Attacks . . 18
6. Token Binding Metadata . . . . . . . . . . . . . . . . . . . 19
6.1. Token Binding Client Metadata . . . . . . . . . . . . . . 19
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