Datagram Transport Layer Security (DTLS) Profile for Authentication and Authorization for Constrained Environments (ACE)
draft-ietf-ace-dtls-authorize-12

Document Type Active Internet-Draft (ace WG)
Last updated 2020-07-27 (latest revision 2020-07-06)
Replaces draft-gerdes-ace-dtls-authorize
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ACE Working Group                                              S. Gerdes
Internet-Draft                                               O. Bergmann
Intended status: Standards Track                              C. Bormann
Expires: January 7, 2021                         Universitaet Bremen TZI
                                                             G. Selander
                                                             Ericsson AB
                                                                L. Seitz
                                                               Combitech
                                                           July 06, 2020

Datagram Transport Layer Security (DTLS) Profile for Authentication and
            Authorization for Constrained Environments (ACE)
                    draft-ietf-ace-dtls-authorize-12

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 version 1.2 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
   Task Force (IETF).  Note that other groups may also distribute
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at https://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   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 January 7, 2021.

Copyright Notice

   Copyright (c) 2020 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Gerdes, et al.           Expires January 7, 2021                [Page 1]
Internet-Draft                  CoAP-DTLS                      July 2020

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (https://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Protocol Overview . . . . . . . . . . . . . . . . . . . . . .   4
   3.  Protocol Flow . . . . . . . . . . . . . . . . . . . . . . . .   5
     3.1.  Communication Between the Client and the Authorization
           Server  . . . . . . . . . . . . . . . . . . . . . . . . .   6
     3.2.  RawPublicKey Mode . . . . . . . . . . . . . . . . . . . .   6
       3.2.1.  DTLS Channel Setup Between Client and Resource Server   9
     3.3.  PreSharedKey Mode . . . . . . . . . . . . . . . . . . . .  10
       3.3.1.  DTLS Channel Setup Between Client and Resource Server  14
     3.4.  Resource Access . . . . . . . . . . . . . . . . . . . . .  16
   4.  Dynamic Update of Authorization Information . . . . . . . . .  17
   5.  Token Expiration  . . . . . . . . . . . . . . . . . . . . . .  19
   6.  Secure Communication with an Authorization Server . . . . . .  19
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .  19
     7.1.  Reuse of Existing Sessions  . . . . . . . . . . . . . . .  21
     7.2.  Multiple Access Tokens  . . . . . . . . . . . . . . . . .  21
     7.3.  Out-of-Band Configuration . . . . . . . . . . . . . . . .  22
   8.  Privacy Considerations  . . . . . . . . . . . . . . . . . . .  22
   9.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  23
   10. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .  23
   11. References  . . . . . . . . . . . . . . . . . . . . . . . . .  23
     11.1.  Normative References . . . . . . . . . . . . . . . . . .  23
     11.2.  Informative References . . . . . . . . . . . . . . . . .  25
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  26

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 version 1.2 [RFC6347] to
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