JWT Response for OAuth Token Introspection
draft-ietf-oauth-jwt-introspection-response-03

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Open Authentication Protocol                         T. Lodderstedt, Ed.
Internet-Draft                                                yes.com AG
Intended status: Standards Track                            V. Dzhuvinov
Expires: November 22, 2019                               Connect2id Ltd.
                                                            May 21, 2019

               JWT Response for OAuth Token Introspection
             draft-ietf-oauth-jwt-introspection-response-03

Abstract

   This draft proposes an additional JSON Web Token (JWT) based response
   for OAuth 2.0 Token Introspection.

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

Copyright Notice

   Copyright (c) 2019 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
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   described in the Simplified BSD License.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Requesting a JWT Response . . . . . . . . . . . . . . . . . .   3
   3.  JWT Response  . . . . . . . . . . . . . . . . . . . . . . . .   3
   4.  Client Metadata . . . . . . . . . . . . . . . . . . . . . . .   4
   5.  Authorization Server Metadata . . . . . . . . . . . . . . . .   5
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .   5
     6.1.  Cross-JWT Confusion . . . . . . . . . . . . . . . . . . .   5
     6.2.  Token Data Leakage  . . . . . . . . . . . . . . . . . . .   6
   7.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   6
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   6
     8.1.  OAuth Dynamic Client Registration Metadata Registration .   7
       8.1.1.  Registry Contents . . . . . . . . . . . . . . . . . .   7
     8.2.  OAuth Authorization Server Metadata Registration  . . . .   7
       8.2.1.  Registry Contents . . . . . . . . . . . . . . . . . .   7
     8.3.  OAuth Token Introspection Response  . . . . . . . . . . .   8
       8.3.1.  Registry Contents . . . . . . . . . . . . . . . . . .   8
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  13
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .  13
     9.2.  Informative References  . . . . . . . . . . . . . . . . .  14
   Appendix A.  Document History . . . . . . . . . . . . . . . . . .  14
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  15

1.  Introduction

   OAuth 2.0 Token Introspection [RFC7662] specifies a method for a
   protected resource to query an OAuth 2.0 authorization server to
   determine the state of an access token and obtain data associated
   with the access token.  This allows deployments to implement
   identifier-based access tokens in an interoperable way.

   The introspection response, as specified in OAuth 2.0 Token
   Introspection [RFC7662], is a plain JSON object.  However, there are
   use cases where the resource server requires stronger assurance that
   the authorization server issued the access token, including cases
   where the authorization server assumes liability for the token's
   content.  An example is a resource server using verified person data
   to create certificates, which in turn are used to create qualified
   electronic signatures.

   In such use cases it may be useful or even required to return a
   signed JWT as the introspection response.  This specification extends
   the token introspection endpoint with the capability to return
   responses as JWTs.

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2.  Requesting a JWT Response