Datagram Transport Layer Security (DTLS) Profile for Authentication and Authorization for Constrained Environments (ACE)
draft-ietf-ace-dtls-authorize-09

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ACE Working Group                                              S. Gerdes
Internet-Draft                                               O. Bergmann
Intended status: Standards Track                              C. Bormann
Expires: June 20, 2020                           Universitaet Bremen TZI
                                                             G. Selander
                                                             Ericsson AB
                                                                L. Seitz
                                                               Combitech
                                                       December 18, 2019

Datagram Transport Layer Security (DTLS) Profile for Authentication and
            Authorization for Constrained Environments (ACE)
                    draft-ietf-ace-dtls-authorize-09

Abstract

   This specification defines a profile of the ACE framework that allows
   constrained servers to delegate client authentication and
   authorization.  The protocol relies on DTLS for communication
   security between entities in a constrained network using either raw
   public keys or pre-shared keys.  A resource-constrained server 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.

   Internet-Drafts are working documents of the Internet Engineering
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   Drafts is at https://datatracker.ietf.org/drafts/current/.

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   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on June 20, 2020.

Copyright Notice

   Copyright (c) 2019 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Gerdes, et al.            Expires June 20, 2020                 [Page 1]
Internet-Draft                  CoAP-DTLS                  December 2019

   This document is subject to BCP 78 and the IETF Trust's Legal
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   (https://trustee.ietf.org/license-info) in effect on the date of
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Protocol Overview . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Protocol Flow . . . . . . . . . . . . . . . . . . . . . . . .   5
     3.1.  Communication between C and AS  . . . . . . . . . . . . .   5
     3.2.  RawPublicKey Mode . . . . . . . . . . . . . . . . . . . .   6
       3.2.1.  DTLS Channel Setup Between C and RS . . . . . . . . .   7
     3.3.  PreSharedKey Mode . . . . . . . . . . . . . . . . . . . .   8
       3.3.1.  DTLS Channel Setup Between C and RS . . . . . . . . .  12
     3.4.  Resource Access . . . . . . . . . . . . . . . . . . . . .  13
   4.  Dynamic Update of Authorization Information . . . . . . . . .  14
   5.  Token Expiration  . . . . . . . . . . . . . . . . . . . . . .  16
   6.  Secure Communication with AS  . . . . . . . . . . . . . . . .  16
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .  16
   8.  Privacy Considerations  . . . . . . . . . . . . . . . . . . .  17
   9.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  17
   10. References  . . . . . . . . . . . . . . . . . . . . . . . . .  18
     10.1.  Normative References . . . . . . . . . . . . . . . . . .  18
     10.2.  Informative References . . . . . . . . . . . . . . . . .  19
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  20

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 obtains an access token, bound to a key (the proof-of-
   possession key), from an authorization server to prove its
   authorization to access protected resources hosted by the resource
   server.  Also, the client and the resource server are provided by the
   authorization server with the necessary keying material to establish
   a DTLS session.  The communication between client and authorization