Proxy Operations for CoAP Group Communication
draft-tiloca-core-groupcomm-proxy-01

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Last updated 2020-07-13
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CoRE Working Group                                             M. Tiloca
Internet-Draft                                                   RISE AB
Intended status: Standards Track                                 E. Dijk
Expires: January 14, 2021                              IoTconsultancy.nl
                                                           July 13, 2020

             Proxy Operations for CoAP Group Communication
                  draft-tiloca-core-groupcomm-proxy-01

Abstract

   This document specifies the operations performed by a forward-proxy,
   when using the Constrained Application Protocol (CoAP) in group
   communication scenarios.  Proxy operations involve the processing of
   individual responses from servers, as reply to a single request sent
   by the client over unicast to the proxy, and then distributed by the
   proxy over IP multicast to the servers.  When receiving the different
   responses via the proxy, the client is able to distinguish them and
   their originator servers, by acquiring their addressing information.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  The Multicast-Signaling Option  . . . . . . . . . . . . . . .   3
   3.  The Response-Forwarding Option  . . . . . . . . . . . . . . .   4
   4.  Requirements and Objectives . . . . . . . . . . . . . . . . .   5
   5.  Protocol Description  . . . . . . . . . . . . . . . . . . . .   6
     5.1.  Request Sending . . . . . . . . . . . . . . . . . . . . .   7
     5.2.  Request Processing at the Proxy . . . . . . . . . . . . .   8
     5.3.  Request and Response Processing at the Server . . . . . .   8
     5.4.  Response Processing at the Proxy  . . . . . . . . . . . .   9
     5.5.  Response Processing at the Client . . . . . . . . . . . .  10
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .  11
     6.1.  Client Authentication . . . . . . . . . . . . . . . . . .  11
     6.2.  Multicast-Signaling Option  . . . . . . . . . . . . . . .  11
     6.3.  Response-Forwarding Option  . . . . . . . . . . . . . . .  12
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  12
     7.1.  CoAP Option Numbers Registry  . . . . . . . . . . . . . .  12
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  13
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .  13
     8.2.  Informative References  . . . . . . . . . . . . . . . . .  14
   Appendix A.  Using OSCORE Between Client and Proxy  . . . . . . .  14
     A.1.  Protecting the Request  . . . . . . . . . . . . . . . . .  14
     A.2.  Verifying the Request . . . . . . . . . . . . . . . . . .  15
     A.3.  Protecting the Response . . . . . . . . . . . . . . . . .  15
     A.4.  Verifying the Response  . . . . . . . . . . . . . . . . .  15
   Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . .  16
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  16

1.  Introduction

   The Constrained Application Protocol (CoAP) [RFC7252] allows the
   presence of forward-proxies, as intermediary entities supporting
   clients to perform requests on their behalf.

   CoAP supports also group communication over IP multicast
   [I-D.ietf-core-groupcomm-bis], where a group request can be addressed
   to multiple recipient servers, each of which may reply with an
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