Datagram Transport Layer Security (DTLS) Profile for Authentication and Authorization for Constrained Environments (ACE)
draft-ietf-ace-dtls-authorize-00

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Last updated 2017-06-08
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ACE Working Group                                              S. Gerdes
Internet-Draft                                               O. Bergmann
Intended status: Standards Track                              C. Bormann
Expires: December 10, 2017                       Universitaet Bremen TZI
                                                             G. Selander
                                                                Ericsson
                                                                L. Seitz
                                                               RISE SICS
                                                           June 08, 2017

Datagram Transport Layer Security (DTLS) Profile for Authentication and
            Authorization for Constrained Environments (ACE)
                    draft-ietf-ace-dtls-authorize-00

Abstract

   This specification defines a profile for delegating client
   authentication and authorization in a constrained environment by
   establishing a Datagram Transport Layer Security (DTLS) channel
   between resource-constrained nodes.  The protocol relies on DTLS for
   communication security between entities in a constrained network.  A
   resource-constrained node can use this protocol to delegate
   management of authorization information to a trusted host with less
   severe limitations regarding processing power and memory.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

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   This Internet-Draft will expire on December 10, 2017.

Copyright Notice

   Copyright (c) 2017 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Gerdes, et al.          Expires December 10, 2017               [Page 1]
Internet-Draft                  CoAP-DTLS                      June 2017

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Protocol Overview . . . . . . . . . . . . . . . . . . . . . .   3
     2.1.  Unauthorized Resource Request Message . . . . . . . . . .   5
     2.2.  AS Information  . . . . . . . . . . . . . . . . . . . . .   6
     2.3.  Resource Access . . . . . . . . . . . . . . . . . . . . .   7
     2.4.  Dynamic Update of Authorization Information . . . . . . .   8
   3.  RawPublicKey Mode . . . . . . . . . . . . . . . . . . . . . .   9
   4.  PreSharedKey Mode . . . . . . . . . . . . . . . . . . . . . .  10
     4.1.  DTLS Channel Setup Between C and RS . . . . . . . . . . .  11
     4.2.  Updating Authorization Information  . . . . . . . . . . .  13
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .  14
     5.1.  Unprotected AS Information  . . . . . . . . . . . . . . .  14
     5.2.  Use of Nonces for Replay Protection . . . . . . . . . . .  14
     5.3.  Privacy . . . . . . . . . . . . . . . . . . . . . . . . .  14
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  14
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  14
     7.1.  Normative References  . . . . . . . . . . . . . . . . . .  14
     7.2.  Informative References  . . . . . . . . . . . . . . . . .  15
     7.3.  URIs  . . . . . . . . . . . . . . . . . . . . . . . . . .  16
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  16

1.  Introduction

   This specification defines a profile of the ACE framework
   [I-D.ietf-ace-oauth-authz].  In this profile, a client and a resource
   server use CoAP [RFC7252] over DTLS [RFC6347] to communicate.  The
   client uses an access token, bound to a key (the proof-of-possession
   key) to authorize its access to the resource server.  DTLS provides
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