OAuth 2.0 Token Exchange
RFC 8693

Document Type RFC - Proposed Standard (January 2020; No errata)
Last updated 2020-01-15
Replaces draft-campbell-oauth-sts, draft-jones-oauth-token-exchange
Stream IETF
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Stream WG state Submitted to IESG for Publication
Document shepherd Rifaat Shekh-Yusef
Shepherd write-up Show (last changed 2017-12-14)
IESG IESG state RFC 8693 (Proposed Standard)
Consensus Boilerplate Yes
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Send notices to "Hannes Tschofenig" <Hannes.Tschofenig@gmx.net>, Rifaat Shekh-Yusef <rifaat.ietf@gmail.com>
IANA IANA review state Version Changed - Review Needed
IANA action state RFC-Ed-Ack


Internet Engineering Task Force (IETF)                          M. Jones
Request for Comments: 8693                                    A. Nadalin
Category: Standards Track                                      Microsoft
ISSN: 2070-1721                                         B. Campbell, Ed.
                                                           Ping Identity
                                                              J. Bradley
                                                                  Yubico
                                                            C. Mortimore
                                                                    Visa
                                                            January 2020

                        OAuth 2.0 Token Exchange

Abstract

   This specification defines a protocol for an HTTP- and JSON-based
   Security Token Service (STS) by defining how to request and obtain
   security tokens from OAuth 2.0 authorization servers, including
   security tokens employing impersonation and delegation.

Status of This Memo

   This is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Further information on
   Internet Standards is available in Section 2 of RFC 7841.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   https://www.rfc-editor.org/info/rfc8693.

Copyright Notice

   Copyright (c) 2020 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
   (https://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction
     1.1.  Delegation vs. Impersonation Semantics
     1.2.  Requirements Notation and Conventions
     1.3.  Terminology
   2.  Token Exchange Request and Response
     2.1.  Request
       2.1.1.  Relationship between Resource, Audience, and Scope
     2.2.  Response
       2.2.1.  Successful Response
       2.2.2.  Error Response
     2.3.  Example Token Exchange
   3.  Token Type Identifiers
   4.  JSON Web Token Claims and Introspection Response Parameters
     4.1.  "act" (Actor) Claim
     4.2.  "scope" (Scopes) Claim
     4.3.  "client_id" (Client Identifier) Claim
     4.4.  "may_act" (Authorized Actor) Claim
   5.  Security Considerations
   6.  Privacy Considerations
   7.  IANA Considerations
     7.1.  OAuth URI Registration
     7.2.  OAuth Parameters Registration
     7.3.  OAuth Access Token Type Registration
     7.4.  JSON Web Token Claims Registration
     7.5.  OAuth Token Introspection Response Registration
   8.  References
     8.1.  Normative References
     8.2.  Informative References
   Appendix A.  Additional Token Exchange Examples
     A.1.  Impersonation Token Exchange Example
       A.1.1.  Token Exchange Request
       A.1.2.  Subject Token Claims
       A.1.3.  Token Exchange Response
       A.1.4.  Issued Token Claims
     A.2.  Delegation Token Exchange Example
       A.2.1.  Token Exchange Request
       A.2.2.  Subject Token Claims
       A.2.3.  Actor Token Claims
       A.2.4.  Token Exchange Response
       A.2.5.  Issued Token Claims
   Acknowledgements
   Authors' Addresses

1.  Introduction

   A security token is a set of information that facilitates the sharing
   of identity and security information in heterogeneous environments or
   across security domains.  Examples of security tokens include JSON
   Web Tokens (JWTs) [JWT] and Security Assertion Markup Language (SAML)
   2.0 assertions [OASIS.saml-core-2.0-os].  Security tokens are
   typically signed to achieve integrity and sometimes also encrypted to
   achieve confidentiality.  Security tokens are also sometimes
   described as assertions, such as in [RFC7521].

   A Security Token Service (STS) is a service capable of validating
   security tokens provided to it and issuing new security tokens in
   response, which enables clients to obtain appropriate access
   credentials for resources in heterogeneous environments or across
   security domains.  Web Service clients have used WS-Trust [WS-Trust]
   as the protocol to interact with an STS for token exchange.  While
   WS-Trust uses XML and SOAP, the trend in modern Web development has
   been towards RESTful (Representational State Transfer) patterns and
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