Reciprocal OAuth

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Last updated 2018-10-19
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OAuth Working Group                                             D. Hardt
Internet-Draft                                                    Amazon
Intended status: Standards Track                        October 19, 2018
Expires: April 22, 2019

                            Reciprocal OAuth


   There are times when a user has a pair of 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.
   Reciprocal OAuth enables a more seamless experience for the user to
   grant access to a pair of protected resources.

Status of This Memo

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   This Internet-Draft will expire on April 22, 2019.

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   Copyright (c) 2018 IETF Trust and the persons identified as the
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   include Simplified BSD License text as described in Section 4.e of

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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, the 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 second complete OAuth flow, but in the reverse
   direction, must be performed.  In practice, this is a complicated
   user experience as the user is at Party A, but the OAuth flow needs
   to start from Party B.  This requires the second flow to send the
   user back to party B, which then sends the user to Party A as the
   first step in the flow.  At the end, the user is at Party B, even
   though the original flow started at Party A.

   Reciprocal OAuth simplifies the user experience by eliminating the
   redirections in the second OAuth flow.  After the intial OAuth flow,
   party A obtains consent from the user to grant party B access to a
   protected resource at party A, and then passes an authorization code
   to party B using the access token party A obtained from party B to
   provide party B the context of the user.  Party B then exchanges the
   authorization code for an access token per the usual OAuth flow.

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.  Reciprocal Scope Request

   When party B is providing an access token response per [RFC6749]
   4.1.4, 4.2.1, 4.3.3 or 4.4.3, party B MAY include an additional query
   component in the redirection URI to indicate the scope requested in
   the reciprocal grant.

   reciprocal OPTIONAL.  The scope of party B's reciprocal access
   request per [RFC6749] 3.3.

   If party B does not provide a reciprocal parameter in the access
   token response, the reciprocal scope will be a value previously
   preconfigured by party A and party B.

   If an authorization code grant access token response per [RFC6749]
   4.1.4, an example successful response:

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    HTTP/1.1 200 OK
    Content-Type: application/json;charset=UTF-8
    Cache-Control: no-store
    Pragma: no-cache

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