OAuth 2.0 Token Introspection
draft-ietf-oauth-introspection-07

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OAuth Working Group                                       J. Richer, Ed.
Internet-Draft                                            March 27, 2015
Intended status: Standards Track
Expires: September 28, 2015

                     OAuth 2.0 Token Introspection
                   draft-ietf-oauth-introspection-07

Abstract

   This specification defines a method for a protected resource to query
   an OAuth 2.0 authorization server to determine the active state of an
   OAuth 2.0 token and to determine meta-information about this token.
   OAuth 2.0 deployments can use this method to convey information about
   the authorization context of the token from the authorization server
   to the protected resource.

Requirements Language

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in RFC 2119 [RFC2119].

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
   working documents as Internet-Drafts.  The list of current Internet-
   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."

   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

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Introspection Endpoint  . . . . . . . . . . . . . . . . . . .   3
     2.1.  Introspection Request . . . . . . . . . . . . . . . . . .   4
     2.2.  Introspection Response  . . . . . . . . . . . . . . . . .   5
     2.3.  Error Response  . . . . . . . . . . . . . . . . . . . . .   8
   3.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   8
     3.1.  OAuth Token Introspection Response Registry . . . . . . .   8
       3.1.1.  Registration Template . . . . . . . . . . . . . . . .   9
       3.1.2.  Initial Registry Contents . . . . . . . . . . . . . .   9
   4.  Security Considerations . . . . . . . . . . . . . . . . . . .  11
   5.  Privacy Considerations  . . . . . . . . . . . . . . . . . . .  13
   6.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  13
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  13
     7.1.  Normative References  . . . . . . . . . . . . . . . . . .  13
     7.2.  Informative References  . . . . . . . . . . . . . . . . .  14
   Appendix A.  Use with Proof of Posession Tokens . . . . . . . . .  14
   Appendix B.  Document History . . . . . . . . . . . . . . . . . .  15
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .  16

1.  Introduction

   In OAuth 2.0, the contents of tokens are opaque to clients.  This
   means that the client does not need to know anything about the
   content or structure of the token itself, if there is any.  However,
   there is still a large amount of metadata that may be attached to a
   token, such as its current validity, approved scopes, and information
   about the context in which the token was issued.  These pieces of
   information are often vital to protected resources making
   authorization decisions based on the tokens being presented.  Since
   OAuth 2.0 [RFC6749] does not define a protocol for the resource
   server to learn meta-information about a token that is has received
   from an authorization server, several different approaches have been
   developed to bridge this gap.  These include using structured token
   formats such as JWT [JWT] or proprietary inter-service communication
   mechanisms (such as shared databases and protected enterprise service
   buses) that convey token information.

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