JWT Response for OAuth Token Introspection
draft-ietf-oauth-jwt-introspection-response-05

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Open Authentication Protocol                         T. Lodderstedt, Ed.
Internet-Draft                                                yes.com AG
Intended status: Standards Track                            V. Dzhuvinov
Expires: January 24, 2020                                Connect2id Ltd.
                                                            Jul 23, 2019

               JWT Response for OAuth Token Introspection
             draft-ietf-oauth-jwt-introspection-response-05

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.

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   This Internet-Draft will expire on January 24, 2020.

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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Lodderstedt & Dzhuvinov Expires January 24, 2020                [Page 1]
Internet-Draft                JWT Response                      Jul 2019

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Requirements Notation and Conventions . . . . . . . . . .   3
   2.  Requesting a JWT Response . . . . . . . . . . . . . . . . . .   3
   3.  JWT Response  . . . . . . . . . . . . . . . . . . . . . . . .   3
   4.  Client Metadata . . . . . . . . . . . . . . . . . . . . . . .   5
   5.  Authorization Server Metadata . . . . . . . . . . . . . . . .   5
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .   6
     6.1.  Cross-JWT Confusion . . . . . . . . . . . . . . . . . . .   6
     6.2.  Token Data Leakage  . . . . . . . . . . . . . . . . . . .   7
     6.3.  Keeping Token Data Confidential from OAuth Clients  . . .   7
     6.4.  Logging and Audit of Introspection Activity . . . . . . .   7
     6.5.  Data Minimization . . . . . . . . . . . . . . . . . . . .   7
   7.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   7
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   8
     8.1.  OAuth Dynamic Client Registration Metadata Registration .   8
       8.1.1.  Registry Contents . . . . . . . . . . . . . . . . . .   8
     8.2.  OAuth Authorization Server Metadata Registration  . . . .   8
       8.2.1.  Registry Contents . . . . . . . . . . . . . . . . . .   8
     8.3.  OAuth Token Introspection Response  . . . . . . . . . . .   9
       8.3.1.  Registry Contents . . . . . . . . . . . . . . . . . .   9
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  14
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .  14
     9.2.  Informative References  . . . . . . . . . . . . . . . . .  15
   Appendix A.  Document History . . . . . . . . . . . . . . . . . .  16
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  17

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