OAuth 2.0 Proof-of-Possession: Authorization Server to Client Key Distribution
draft-ietf-oauth-pop-key-distribution-04

Document Type Active Internet-Draft (oauth WG)
Last updated 2018-10-23
Replaces draft-bradley-oauth-pop-key-distribution
Stream IETF
Intended RFC status Proposed Standard
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Stream WG state WG Document (wg milestone: Jul 2017 - Submit 'OAuth 2.0 Pr... )
Document shepherd Kepeng Li
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Network Working Group                                         J. Bradley
Internet-Draft                                             Ping Identity
Intended status: Standards Track                                 P. Hunt
Expires: April 26, 2019                               Oracle Corporation
                                                                M. Jones
                                                               Microsoft
                                                           H. Tschofenig
                                                                Arm Ltd.
                                                               M. Mihaly
                                                          NIIF Institute
                                                        October 23, 2018

   OAuth 2.0 Proof-of-Possession: Authorization Server to Client Key
                              Distribution
                draft-ietf-oauth-pop-key-distribution-04

Abstract

   RFC 6750 specified the bearer token concept for securing access to
   protected resources.  Bearer tokens need to be protected in transit
   as well as at rest.  When a client requests access to a protected
   resource it hands-over the bearer token to the resource server.

   The OAuth 2.0 Proof-of-Possession security concept extends bearer
   token security and requires the client to demonstrate possession of a
   key when accessing a protected resource.

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
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   This Internet-Draft will expire on April 26, 2019.

Bradley, et al.          Expires April 26, 2019                 [Page 1]
Internet-Draft  OAuth 2.0 PoP: AS-Client Key Distribution   October 2018

Copyright Notice

   Copyright (c) 2018 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
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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   4
   3.  Processing Instructions . . . . . . . . . . . . . . . . . . .   4
   4.  Examples  . . . . . . . . . . . . . . . . . . . . . . . . . .   5
     4.1.  Symmetric Key Transport . . . . . . . . . . . . . . . . .   5
       4.1.1.  Client-to-AS Request  . . . . . . . . . . . . . . . .   5
       4.1.2.  Client-to-AS Response . . . . . . . . . . . . . . . .   6
     4.2.  Asymmetric Key Transport  . . . . . . . . . . . . . . . .   9
       4.2.1.  Client-to-AS Request  . . . . . . . . . . . . . . . .   9
       4.2.2.  Client-to-AS Response . . . . . . . . . . . . . . . .  10
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .  11
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  13
     6.1.  OAuth Access Token Types  . . . . . . . . . . . . . . . .  13
     6.2.  OAuth Parameters Registration . . . . . . . . . . . . . .  13
     6.3.  OAuth Extensions Error Registration . . . . . . . . . . .  13
   7.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  14
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  14
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .  14
     8.2.  Informative References  . . . . . . . . . . . . . . . . .  15
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  16

1.  Introduction

   The work on proof-of-possession tokens, an extended token security
   mechanisms for OAuth 2.0, is motivated in [21].  This document
   defines the ability for the client request and to obtain PoP tokens
   from the authorization server.  After successfully completing the
   exchange the client is in possession of a PoP token and the keying
   material bound to it.  Clients that access protected resources then
   need to demonstrate knowledge of the secret key that is bound to the
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