Network Working Group D. Hardt Internet-Draft Amazon Intended status: Informational November 13, 2017 Expires: May 17, 2018 This is an Internet-draft draft-hardt-oauth-mutual-00 Abstract There are times when a user has a pair protected resources that would like to request access to each other. While OAuth flows typically enable the user to grant a client access to a protected resource, granting the inverse access requires an additional flow. Mutual OAuth enables a more seemless experience for the user to grant access to a pair of protected resources. 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 https://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 May 17, 2018. Copyright Notice Copyright (c) 2017 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 Hardt Expires May 17, 2018 [Page 1] Internet-Draft I-D November 2017 the Trust Legal Provisions and are provided without warranty as described in the Simplified BSD License. 1. Introduction In the usual three legged, authorization code grant, OAuth flow enables a resource owner (user) to enable a client (party A) to be granted authorization to access a protected resource (party B). If party A also has a protected resource that the user would like to let party B access, then a complete OAuth flow, but in the reverse direction, must be performed. Mutual OAuth enables party A to obtain constent from the user to grant access to a protected resource at party A, and to short circuit the OAuth flow by passing an authorization code to party B using the acces token party A obtained from party B to provide party B the context of the user. This simplifies the user experience for each party to obtain acces tokens from the other. 1.1. Terminology In this document, the key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" are to be interpreted as described in BCP 14, RFC 2119 [RFC2119]. 2. Mutual Authorization Flow The mutual authorization flow starts after the client (party A) has obtained an access token from the authorization server (party B) per [RFC6749] 4.1 Authorization Code Grant. After party A obtains consent from the user to grant access to protected resources at party A, party A generates an authorization code representing the access granted to party B for that user. Party A then makes a request to party B's token endpoint by sending the following parameters using the "application/x-www-form-urlencoded" format per [RFC6749] Appendix B with a character encoding of UTF-8 in the HTTP request entity-body: grant_type REQUIRED. Value MUST be set to "mutual_authorization_code". code REQUIRED. The authorization code generated by party A. client_id REQUIRED, party A'a client ID. Hardt Expires May 17, 2018 [Page 2] Internet-Draft I-D November 2017 and pass the access token obtained from Party B in the HTTP authorization header. For example, the client makes the following HTTP request using TLS (with extra line breaks for display purposes only): POST /token HTTP/1.1 Host: server.example.com Authorization: Bearer ej4hsyfishwssjdusisdhkjsdksusdhjkjsdjk Content-Type: application/x-www-form-urlencoded grant_type=mutual_authorization_code&code=hasdyubasdjahsbdkjbasd Party B MUST then verify the access token was granted to the client identified by the client_id. Party B then plays the role of the client to make an access token request per [RFC6749] 4.1.3. 3. IANA Considerations TBD. 4. Acknowledgements TBD. 5. Normative References [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, DOI 10.17487/RFC2119, March 1997, . [RFC6749] Hardt, D., Ed., "The OAuth 2.0 Authorization Framework", RFC 6749, DOI 10.17487/RFC6749, October 2012, . [RFC6750] Jones, M. and D. Hardt, "The OAuth 2.0 Authorization Framework: Bearer Token Usage", RFC 6750, DOI 10.17487/RFC6750, October 2012, . Appendix A. Document History Hardt Expires May 17, 2018 [Page 3] Internet-Draft I-D November 2017 A.1. draft-hardt-distributed-oauth-00 o Initial version. Author's Address Dick Hardt Amazon Email: dick.hardt@gmail.com Hardt Expires May 17, 2018 [Page 4]