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

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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

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   document authors.  All rights reserved.

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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