Key Management for OSCORE Groups in ACE
draft-tiloca-ace-oscoap-joining-05

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ACE Working Group                                              M. Tiloca
Internet-Draft                                                   RISE AB
Intended status: Standards Track                                 J. Park
Expires: April 25, 2019                      Universitaet Duisburg-Essen
                                                            F. Palombini
                                                             Ericsson AB
                                                        October 22, 2018

                Key Management for OSCORE Groups in ACE
                   draft-tiloca-ace-oscoap-joining-05

Abstract

   This document describes a method to request and provision keying
   material in group communication scenarios where communications are
   based on CoAP and secured with Object Security for Constrained
   RESTful Environments (OSCORE).  The proposed method delegates the
   authentication and authorization of new client nodes that join an
   OSCORE group through a Group Manager server.  This approach builds on
   the ACE framework for Authentication and Authorization, and leverages
   protocol-specific profiles of ACE to achieve communication security,
   proof-of-possession and server authentication.

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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   This Internet-Draft will expire on April 25, 2019.

Copyright Notice

   Copyright (c) 2018 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

Tiloca, et al.           Expires April 25, 2019                 [Page 1]
Internet-Draft   Key Management for OSCORE Groups in ACE    October 2018

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   3
     1.2.  Relation to Other Documents . . . . . . . . . . . . . . .   5
   2.  Protocol Overview . . . . . . . . . . . . . . . . . . . . . .   5
     2.1.  Overview of the Join Process  . . . . . . . . . . . . . .   7
     2.2.  Overview of the Group Rekeying Process  . . . . . . . . .   7
   3.  Joining Node to Authorization Server  . . . . . . . . . . . .   8
     3.1.  Authorization Request . . . . . . . . . . . . . . . . . .   8
     3.2.  Authorization Response  . . . . . . . . . . . . . . . . .   9
   4.  Joining Node to Group Manager . . . . . . . . . . . . . . . .  10
     4.1.  Join Request  . . . . . . . . . . . . . . . . . . . . . .  10
     4.2.  Join Response . . . . . . . . . . . . . . . . . . . . . .  10
   5.  Leaving of a Group Member . . . . . . . . . . . . . . . . . .  12
   6.  Public Keys of Joining Nodes  . . . . . . . . . . . . . . . .  12
   7.  Group Rekeying Process  . . . . . . . . . . . . . . . . . . .  14
   8.  Security Considerations . . . . . . . . . . . . . . . . . . .  14
   9.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  15
   10. References  . . . . . . . . . . . . . . . . . . . . . . . . .  15
     10.1.  Normative References . . . . . . . . . . . . . . . . . .  15
     10.2.  Informative References . . . . . . . . . . . . . . . . .  16
   Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . .  17
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  17

1.  Introduction

   Object Security for Constrained RESTful Environments (OSCORE)
   [I-D.ietf-core-object-security] is a method for application-layer
   protection of the Constrained Application Protocol (CoAP) [RFC7252],
   using CBOR Object Signing and Encryption (COSE) [RFC8152] and
   enabling end-to-end security of CoAP payload and options.

   As described in [I-D.ietf-core-oscore-groupcomm], OSCORE may be used
   to protect CoAP group communication over IP multicast [RFC7390].
   This relies on a Group Manager, which is responsible for managing an