Secure group communication for CoAP
draft-tiloca-core-multicast-oscoap-01

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CoRE Working Group                                             M. Tiloca
Internet-Draft                                              RISE SICS AB
Intended status: Standards Track                             G. Selander
Expires: September 14, 2017                                 F. Palombini
                                                             Ericsson AB
                                                          March 13, 2017

                  Secure group communication for CoAP
                 draft-tiloca-core-multicast-oscoap-01

Abstract

   This document describes a method for application layer protection of
   messages exchanged with the Constrained Application Protocol (CoAP)
   in a group communication context.  The proposed approach relies on
   Object Security of CoAP (OSCOAP) and the CBOR Object Signing and
   Encryption (COSE) format.  All security requirements fulfilled by
   OSCOAP are maintained for multicast CoAP request messages and related
   unicast CoAP response messages.  Source authentication of all
   messages exchanged within the group is ensured, by means of digital
   signatures produced through asymmetric private keys of sender devices
   and embedded in the protected CoAP messages.

Status of This Memo

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   Copyright (c) 2017 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 September 14, 2017               [Page 1]
Internet-Draft     Secure group communication for CoAP        March 2017

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Requirements  . . . . . . . . . . . . . . . . . . . . . . . .   4
   3.  Scope Description . . . . . . . . . . . . . . . . . . . . . .   7
   4.  Security Context  . . . . . . . . . . . . . . . . . . . . . .   8
   5.  The COSE Object . . . . . . . . . . . . . . . . . . . . . . .   9
   6.  Message Processing  . . . . . . . . . . . . . . . . . . . . .  10
     6.1.  Protecting the Request  . . . . . . . . . . . . . . . . .  10
     6.2.  Verifying the Request . . . . . . . . . . . . . . . . . .  10
     6.3.  Protecting the Response . . . . . . . . . . . . . . . . .  11
     6.4.  Verifying the Response  . . . . . . . . . . . . . . . . .  11
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .  12
     7.1.  Group-level Security  . . . . . . . . . . . . . . . . . .  12
     7.2.  Management of Group Keying Material . . . . . . . . . . .  12
     7.3.  Late Joining Endpoints  . . . . . . . . . . . . . . . . .  13
     7.4.  Provisioning of Public Keys . . . . . . . . . . . . . . .  13
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  14
   9.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .  14
   10. References  . . . . . . . . . . . . . . . . . . . . . . . . .  14
     10.1.  Normative References . . . . . . . . . . . . . . . . . .  14
     10.2.  Informative References . . . . . . . . . . . . . . . . .  15
   Appendix A.  Group Joining Based on the ACE Framework . . . . . .  16
   Appendix B.  List of Use Cases  . . . . . . . . . . . . . . . . .  17
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  19

1.  Introduction

   The Constrained Application Protocol (CoAP) [RFC7252] is a web
   transfer protocol specifically designed for constrained devices and
   networks.

   [RFC7390] enables group communication for CoAP, addressing use cases
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