Datagram Transport Layer Security (DTLS) Profile for Authentication and Authorization for Constrained Environments (ACE)
draft-ietf-ace-dtls-authorize-04

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ACE Working Group                                              S. Gerdes
Internet-Draft                                               O. Bergmann
Intended status: Standards Track                              C. Bormann
Expires: March 10, 2019                          Universitaet Bremen TZI
                                                             G. Selander
                                                                Ericsson
                                                                L. Seitz
                                                               RISE SICS
                                                      September 06, 2018

Datagram Transport Layer Security (DTLS) Profile for Authentication and
            Authorization for Constrained Environments (ACE)
                    draft-ietf-ace-dtls-authorize-04

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
   using either raw public keys or pre-shared keys.  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.

   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 https://datatracker.ietf.org/drafts/current/.

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   and may be updated, replaced, or obsoleted by other documents at any
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   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on March 10, 2019.

Gerdes, et al.           Expires March 10, 2019                 [Page 1]
Internet-Draft                  CoAP-DTLS                 September 2018

Copyright Notice

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   document authors.  All rights reserved.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Protocol Overview . . . . . . . . . . . . . . . . . . . . . .   3
     2.1.  Resource Access . . . . . . . . . . . . . . . . . . . . .   5
     2.2.  Dynamic Update of Authorization Information . . . . . . .   7
     2.3.  Token Expiration  . . . . . . . . . . . . . . . . . . . .   8
   3.  RawPublicKey Mode . . . . . . . . . . . . . . . . . . . . . .   9
   4.  PreSharedKey Mode . . . . . . . . . . . . . . . . . . . . . .  10
     4.1.  DTLS Channel Setup Between C and RS . . . . . . . . . . .  12
     4.2.  Updating Authorization Information  . . . . . . . . . . .  13
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .  14
   6.  Privacy Considerations  . . . . . . . . . . . . . . . . . . .  14
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  14
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  15
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .  15
     8.2.  Informative References  . . . . . . . . . . . . . . . . .  16
     8.3.  URIs  . . . . . . . . . . . . . . . . . . . . . . . . . .  17
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  18

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 protected resources hosted by the
   resource server.  DTLS provides communication security, proof of
   possession, and server authentication.  Optionally the client and the
   resource server may also use CoAP over DTLS to communicate with the
   authorization server.  This specification supports the DTLS handshake