Group OSCORE - Secure Group Communication for CoAP
draft-ietf-core-oscore-groupcomm-07

Document Type Active Internet-Draft (core WG)
Last updated 2020-03-09
Replaces draft-tiloca-core-multicast-oscoap
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CoRE Working Group                                             M. Tiloca
Internet-Draft                                                   RISE AB
Intended status: Standards Track                             G. Selander
Expires: September 10, 2020                                 F. Palombini
                                                             Ericsson AB
                                                                 J. Park
                                             Universitaet Duisburg-Essen
                                                          March 09, 2020

           Group OSCORE - Secure Group Communication for CoAP
                   draft-ietf-core-oscore-groupcomm-07

Abstract

   This document defines Group Object Security for Constrained RESTful
   Environments (Group OSCORE), providing end-to-end security of CoAP
   messages exchanged between members of a group, e.g. using IP
   multicast.  In particular, the described approach defines how OSCORE
   should be used in a group communication setting to provide source
   authentication for CoAP group requests, sent by a client to multiple
   servers, and the corresponding CoAP responses.

Status of This Memo

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   This Internet-Draft will expire on September 10, 2020.

Copyright Notice

   Copyright (c) 2020 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
   (https://trustee.ietf.org/license-info) in effect on the date of

Tiloca, et al.         Expires September 10, 2020               [Page 1]
Internet-Draft                Group OSCORE                    March 2020

   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   4
     1.1.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   5
   2.  Security Context  . . . . . . . . . . . . . . . . . . . . . .   6
     2.1.  Common Context  . . . . . . . . . . . . . . . . . . . . .   7
     2.2.  Sender Context and Recipient Context  . . . . . . . . . .   8
     2.3.  The Group Manager . . . . . . . . . . . . . . . . . . . .   9
     2.4.  Management of Group Keying Material . . . . . . . . . . .   9
     2.5.  Wrap-Around of Partial IVs  . . . . . . . . . . . . . . .  10
   3.  Pairwise Keys . . . . . . . . . . . . . . . . . . . . . . . .  11
     3.1.  Note on Implementation  . . . . . . . . . . . . . . . . .  12
   4.  The COSE Object . . . . . . . . . . . . . . . . . . . . . . .  12
     4.1.  Counter Signature . . . . . . . . . . . . . . . . . . . .  12
     4.2.  The 'kid' and 'kid context' parameters  . . . . . . . . .  13
     4.3.  external_aad  . . . . . . . . . . . . . . . . . . . . . .  13
       4.3.1.  external_aad for Encryption . . . . . . . . . . . . .  13
       4.3.2.  external_aad for Signing  . . . . . . . . . . . . . .  14
   5.  OSCORE Header Compression . . . . . . . . . . . . . . . . . .  15
     5.1.  Examples of Compressed COSE Objects . . . . . . . . . . .  15
   6.  Message Binding, Sequence Numbers, Freshness and Replay
       Protection  . . . . . . . . . . . . . . . . . . . . . . . . .  17
     6.1.  Synchronization of Sender Sequence Numbers  . . . . . . .  17
   7.  Message Processing  . . . . . . . . . . . . . . . . . . . . .  17
     7.1.  Protecting the Request  . . . . . . . . . . . . . . . . .  18
       7.1.1.  Supporting Observe  . . . . . . . . . . . . . . . . .  18
     7.2.  Verifying the Request . . . . . . . . . . . . . . . . . .  18
       7.2.1.  Supporting Observe  . . . . . . . . . . . . . . . . .  19
     7.3.  Protecting the Response . . . . . . . . . . . . . . . . .  20
       7.3.1.  Supporting Observe  . . . . . . . . . . . . . . . . .  20
     7.4.  Verifying the Response  . . . . . . . . . . . . . . . . .  21
       7.4.1.  Supporting Observe  . . . . . . . . . . . . . . . . .  22
   8.  Responsibilities of the Group Manager . . . . . . . . . . . .  22
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