Secure group communication for CoAP
draft-ietf-core-oscore-groupcomm-00

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CoRE Working Group                                             M. Tiloca
Internet-Draft                                              RISE SICS AB
Intended status: Standards Track                             G. Selander
Expires: August 16, 2018                                    F. Palombini
                                                             Ericsson AB
                                                                 J. Park
                                             Universitaet Duisburg-Essen
                                                       February 12, 2018

                  Secure group communication for CoAP
                  draft-ietf-core-oscore-groupcomm-00

Abstract

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

Status of This Memo

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   This Internet-Draft will expire on August 16, 2018.

Copyright Notice

   Copyright (c) 2018 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Tiloca, et al.           Expires August 16, 2018                [Page 1]
Internet-Draft     Secure group communication for CoAP     February 2018

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Assumptions and Security Objectives . . . . . . . . . . . . .   5
     2.1.  Assumptions . . . . . . . . . . . . . . . . . . . . . . .   5
     2.2.  Security Objectives . . . . . . . . . . . . . . . . . . .   7
   3.  OSCORE Security Context . . . . . . . . . . . . . . . . . . .   7
     3.1.  Management of Group Keying Material . . . . . . . . . . .   9
   4.  The COSE Object . . . . . . . . . . . . . . . . . . . . . . .  10
   5.  Message Processing  . . . . . . . . . . . . . . . . . . . . .  12
     5.1.  Protecting the Request  . . . . . . . . . . . . . . . . .  12
     5.2.  Verifying the Request . . . . . . . . . . . . . . . . . .  13
     5.3.  Protecting the Response . . . . . . . . . . . . . . . . .  13
     5.4.  Verifying the Response  . . . . . . . . . . . . . . . . .  13
   6.  Synchronization of Sequence Numbers . . . . . . . . . . . . .  14
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .  14
     7.1.  Group-level Security  . . . . . . . . . . . . . . . . . .  15
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  15
   9.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .  15
   10. References  . . . . . . . . . . . . . . . . . . . . . . . . .  15
     10.1.  Normative References . . . . . . . . . . . . . . . . . .  15
     10.2.  Informative References . . . . . . . . . . . . . . . . .  16
   Appendix A.  List of Use Cases  . . . . . . . . . . . . . . . . .  18
   Appendix B.  Example of Group Identifier Format . . . . . . . . .  20
   Appendix C.  Set-up of New Endpoints  . . . . . . . . . . . . . .  21
     C.1.  Join Process  . . . . . . . . . . . . . . . . . . . . . .  21
     C.2.  Provisioning and Retrieval of Public Keys . . . . . . . .  23
     C.3.  Group Joining Based on the ACE Framework  . . . . . . . .  24
   Appendix D.  Examples of Synchronization Approaches . . . . . . .  25
     D.1.  Best-Effort Synchronization . . . . . . . . . . . . . . .  25
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