Protecting EST Payloads with OSCORE
draft-selander-ace-coap-est-oscore-03

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Last updated 2020-03-09
Replaces draft-selander-ace-eals
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ACE Working Group                                            G. Selander
Internet-Draft                                               Ericsson AB
Intended status: Standards Track                                 S. Raza
Expires: September 10, 2020                                         RISE
                                                              M. Furuhed
                                                                   Nexus
                                                              M. Vucinic
                                                               T. Claeys
                                                                   INRIA
                                                          March 09, 2020

                  Protecting EST Payloads with OSCORE
                 draft-selander-ace-coap-est-oscore-03

Abstract

   This document specifies public-key certificate enrollment procedures
   protected with application-layer security protocols suitable for
   Internet of Things (IoT) deployments.  The protocols leverage payload
   formats defined in Enrollment over Secure Transport (EST) and
   existing IoT standards including the Constrained Application Protocol
   (CoAP), Concise Binary Object Representation (CBOR) and the CBOR
   Object Signing and Encryption (COSE) format.

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.

Selander, et al.       Expires September 10, 2020               [Page 1]
Internet-Draft                 EST-oscore                     March 2020

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  EST-coaps operational differences . . . . . . . . . . . .   3
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   4
   3.  OSCORE and Authenticated Key Establishment  . . . . . . . . .   4
     3.1.  EDHOC . . . . . . . . . . . . . . . . . . . . . . . . . .   5
   4.  Protocol Design and Layering  . . . . . . . . . . . . . . . .   6
     4.1.  Discovery and URI . . . . . . . . . . . . . . . . . . . .   6
     4.2.  Mandatory/optional EST Functions  . . . . . . . . . . . .   6
     4.3.  Payload formats . . . . . . . . . . . . . . . . . . . . .   7
     4.4.  Message Bindings  . . . . . . . . . . . . . . . . . . . .   8
     4.5.  CoAP response codes . . . . . . . . . . . . . . . . . . .   9
     4.6.  Message fragmentation . . . . . . . . . . . . . . . . . .   9
     4.7.  Delayed Responses . . . . . . . . . . . . . . . . . . . .   9
   5.  HTTP-CoAP registrar . . . . . . . . . . . . . . . . . . . . .   9
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .  10
   7.  Privacy Considerations  . . . . . . . . . . . . . . . . . . .  10
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  10
   9.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .  10
   10. References  . . . . . . . . . . . . . . . . . . . . . . . . .  10
     10.1.  Normative References . . . . . . . . . . . . . . . . . .  10
     10.2.  Informative References . . . . . . . . . . . . . . . . .  11
   Appendix A.  Other Authentication Methods . . . . . . . . . . . .  13
     A.1.  TTP Assisted Authentication . . . . . . . . . . . . . . .  13
     A.2.  PSK Based Authentication  . . . . . . . . . . . . . . . .  14
     A.3.  EDHOC with alternative authentication methods . . . . . .  15
   Appendix B.  CBOR Encoding of EST Payloads  . . . . . . . . . . .  15
     B.1.  Distribution of CA Certificates (/crts) . . . . . . . . .  15
     B.2.  Enrollment/Re-enrollment of Clients (/sen, /sren) . . . .  16
       B.2.1.  CBOR Certificate Request Examples . . . . . . . . . .  16
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