Privacy-Enhanced Tokens for Authorization in ACE
draft-cuellar-ace-pat-priv-enhanced-authz-tokens-04

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Last updated 2016-12-29
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ACE Working Group                                             J. Cuellar
Internet-Draft                                             P. Kasinathan
Intended status: Standards Track                              Siemens AG
Expires: July 2, 2017                                           D. Calvo
                                            Atos Research and Innovation
                                                       December 29, 2016

            Privacy-Enhanced Tokens for Authorization in ACE
          draft-cuellar-ace-pat-priv-enhanced-authz-tokens-04

Abstract

   This specification defines PAT, "Privacy-Enhanced-Authorization-
   Tokens" or "Pseudonym-based Authorization Tokens", a protocol and a
   token construction procedure for client authorization in a
   constrained environment.

   This memo also specifies a profile for ACE framework for
   Authentication and Authorization for constrained environments.  This
   draft uses CBOR Web Token (CWT) and CBOR Object Signing and
   Encryption (COSE) to encode PAT messages.

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
   Task Force (IETF).  Note that other groups may also distribute
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   Drafts is at http://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
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   time.  It is inappropriate to use Internet-Drafts as reference
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   This Internet-Draft will expire on July 2, 2017.

Copyright Notice

   Copyright (c) 2016 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
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of

Cuellar, et al.           Expires July 2, 2017                  [Page 1]
Internet-Draft            PAT profile of ACE 04            December 2016

   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Overview  . . . . . . . . . . . . . . . . . . . . . . . . . .   4
     3.1.  Features  . . . . . . . . . . . . . . . . . . . . . . . .   5
   4.  Protocol overview . . . . . . . . . . . . . . . . . . . . . .   6
     4.1.  RS<-> AS: Security-association-Setup  . . . . . . . . . .   8
     4.2.  [C->RS : Resource-Request]  . . . . . . . . . . . . . . .   9
     4.3.  [RS->C : Un-Authorized-Request(AS-Info)]  . . . . . . . .   9
     4.4.  C<->AS : Security-Association-Setup . . . . . . . . . . .  11
     4.5.  C->AS : Access-Request  . . . . . . . . . . . . . . . . .  11
     4.6.  C<-AS : Access-Response . . . . . . . . . . . . . . . . .  12
     4.7.  C->RS : Resource-Request  . . . . . . . . . . . . . . . .  15
     4.8.  RS->C : Resource-Response . . . . . . . . . . . . . . . .  18
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .  22
     5.1.  Privacy Considerations  . . . . . . . . . . . . . . . . .  22
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  22
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  22
     7.1.  Normative References  . . . . . . . . . . . . . . . . . .  22
     7.2.  Informative References  . . . . . . . . . . . . . . . . .  23
   8.  Acknowledgement . . . . . . . . . . . . . . . . . . . . . . .  24
   9.  Appendix A  . . . . . . . . . . . . . . . . . . . . . . . . .  24
     9.1.  ACE profile Registration  . . . . . . . . . . . . . . . .  24
     9.2.  Copyright Statement . . . . . . . . . . . . . . . . . . .  24
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  25

1.  Introduction

   Three well-known problems in constrained environments are the
   authorization of clients to access resources on servers, the
   realization of secure communication between nodes, and the
   preservation of privacy.  The reader is referred for instance to
   [draft-ietf-ace-actors], [I-D.ietf-ace-oauth-authz] and [KoMa2014].

   This memo describes a way of constructing Token Material (Key
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