Joining of OSCOAP multicast groups in ACE
draft-tiloca-ace-oscoap-joining-00

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ACE Working Group                                              M. Tiloca
Internet-Draft                                              RISE SICS AB
Intended status: Standards Track                                 J. Park
Expires: January 3, 2018                     Universitaet Duisburg-Essen
                                                           July 02, 2017

               Joining of OSCOAP multicast groups in ACE
                   draft-tiloca-ace-oscoap-joining-00

Abstract

   This document describes a method to join a multicast group where
   communications are based on CoAP and secured with Object Security of
   CoAP (OSCOAP).  The proposed method delegates the authentication and
   authorization of client nodes that join a multicast 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

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Tiloca & Park            Expires January 3, 2018                [Page 1]
Internet-Draft         OSCOAP group joining in ACE             July 2017

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Protocol Overview . . . . . . . . . . . . . . . . . . . . . .   4
   3.  Joining Node to Authorization Server  . . . . . . . . . . . .   6
   4.  Joining Node to Group Manager . . . . . . . . . . . . . . . .   7
   5.  Public Keys of Joining Nodes  . . . . . . . . . . . . . . . .   8
   6.  Updating Authorization Information  . . . . . . . . . . . . .   9
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .  10
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  11
   9.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .  11
   10. References  . . . . . . . . . . . . . . . . . . . . . . . . .  11
     10.1.  Normative References . . . . . . . . . . . . . . . . . .  11
     10.2.  Informative References . . . . . . . . . . . . . . . . .  12
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  13

1.  Introduction

   The Constrained Application Protocol (CoAP) [RFC7252] supports also
   group communication scenarios, where request messages can be
   delivered to multiple recipients using CoAP on top of IP multicast
   [RFC7390].

   Object Security of CoAP (OSCOAP) [I-D.ietf-core-object-security] is a
   method for application layer protection of CoAP messages, using the
   CBOR Object Signing and Encryption (COSE) [I-D.ietf-cose-msg], and
   enabling end-to-end security of CoAP payload and options.

   OSCOAP may also be used to protect group communication for CoAP over
   IP multicast, as described in [I-D.tiloca-core-multicast-oscoap].
   This relies on a Group Manager entity, which is responsible for
   managing a multicast group where members exchange CoAP messages
   secured with OSCOAP.  In particular, the Group Manager coordinates
   the join process of new group members and can be responsible for
   multiple groups.

   This document builds on the ACE framework for Authentication and
   Authorization [I-D.ietf-ace-oauth-authz] and specifies how a client
   joins an OSCOAP multicast group through a resource server acting as
   Group Manager.  The client acting as joining node relies on an Access
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