This is an Internet-draft

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Last updated 2017-11-13
Replaces draft-hardt-mutual-oauth
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Network Working Group                                           D. Hardt
Internet-Draft                                                    Amazon
Intended status: Informational                         November 13, 2017
Expires: May 17, 2018

                       This is an Internet-draft


   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

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   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",
   and "OPTIONAL" are to be interpreted as described in BCP 14, RFC 2119

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

   code REQUIRED.  The authorization code generated by party A.

   client_id REQUIRED, party A'a client ID.

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   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
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