Distributed 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                             B. Campbell
Expires: April 22, 2019                                    Ping Identity
                                                             N. Sakimura
                                                        October 19, 2018

                           Distributed OAuth


   The Distributed OAuth profile enables an OAuth client to discover
   what authorization server or servers may be used to obtain access
   tokens for a given resource, and what parameter values to provide in
   the access token request.

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   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

1.  Introduction

   In [RFC6749], there is a single resource server and authorization
   server.  In more complex and distributed systems, a clients may
   access many different resource servers, which have different
   authorization servers managing access.  For example, a client may be
   accessing two different resources that provides similar
   functionality, but each is in a different geopolitical region, which
   requires authorization from authorization servers located in each
   geopolitical region.

   A priori knowledge by the client of the relationships between
   resource servers and authorizations servers is not practical as the
   number of resource servers and authorization servers scales up.  The
   client needs to discover on-demand which authorization server to
   request authorization for a given resource, and what parameters to
   pass.  Being able to discover how to access a protected resource also
   enables more flexible software development as changes to the scopes,
   realms and authorization servers can happen dynamically with no
   change to client code.

1.1.  Notational Conventions

   In this document, the key words "MUST", "MUST NOT", "REQUIRED",
   and "OPTIONAL" are to be interpreted as described in BCP 14,

1.2.  Terminology

   Issuer: the party issuing the access token, also known as the
   authorization server.

   All other terms are as defined in [RFC6749] and [RFC6750]

1.3.  Protocol Overview

   Figure 1 shows an abstract flow of distributed OAuth.

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    +--------+                               +---------------+
    |        |--(A)-- Discovery Request ---->|   Resource    |
    |        |                               |    Server     |
    |        |<-(B)-- Discovery Response ----|               |
    |        |                               +---------------+
    |        |
    |        |  (client obtains authorization grant)
    |        |
    |        |                               +---------------+
    |        |--(C)- Authorization Request ->| Authorization |
    | Client |                               |     Server    |
    |        |<-(D)----- Access Token -------|               |
    |        |                               +---------------+
    |        |
    |        |                               +---------------+
    |        |--(E)----- Access Token ------>|    Resource   |
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