OAuth 2.0 Token Binding
draft-ietf-oauth-token-binding-08
OAuth Working Group M. Jones
Internet-Draft Microsoft
Intended status: Standards Track B. Campbell
Expires: April 22, 2019 Ping Identity
J. Bradley
Yubico
W. Denniss
Google
October 19, 2018
OAuth 2.0 Token Binding
draft-ietf-oauth-token-binding-08
Abstract
This specification enables OAuth 2.0 implementations to apply Token
Binding to Access Tokens, Authorization Codes, Refresh Tokens, JWT
Authorization Grants, and JWT Client Authentication. 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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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.
Jones, et al. Expires April 22, 2019 [Page 1]
Internet-Draft OAuth 2.0 Token Binding October 2018
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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 . . . . . . . . . . . . . . 4
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 Metadata . . . . . . . . . . . . . . . . . . . 13
4.1. Token Binding Client Metadata . . . . . . . . . . . . . . 13
4.2. Token Binding Authorization Server Metadata . . . . . . . 13
5. Token Binding for Authorization Codes . . . . . . . . . . . . 14
5.1. Native Application Clients . . . . . . . . . . . . . . . 14
5.1.1. Code Challenge . . . . . . . . . . . . . . . . . . . 14
5.1.1.1. Example Code Challenge . . . . . . . . . . . . . 15
5.1.2. Code Verifier . . . . . . . . . . . . . . . . . . . . 15
5.1.2.1. Example Code Verifier . . . . . . . . . . . . . . 16
5.2. Web Server Clients . . . . . . . . . . . . . . . . . . . 16
5.2.1. Code Challenge . . . . . . . . . . . . . . . . . . . 17
5.2.1.1. Example Code Challenge . . . . . . . . . . . . . 17
5.2.2. Code Verifier . . . . . . . . . . . . . . . . . . . . 18
5.2.2.1. Example Code Verifier . . . . . . . . . . . . . . 18
6. Token Binding JWT Authorization Grants and Client
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