Protecting EST payloads with OSCORE
draft-selander-ace-coap-est-oscore-02

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ACE Working Group                                            G. Selander
Internet-Draft                                               Ericsson AB
Intended status: Standards Track                                 S. Raza
Expires: September 9, 2019                                     RISE SICS
                                                              M. Furuhed
                                                                   Nexus
                                                              M. Vucinic
                                                University of Montenegro
                                                          March 08, 2019

                  Protecting EST payloads with OSCORE
                 draft-selander-ace-coap-est-oscore-02

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 Enrolment 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 9, 2019.

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   Copyright (c) 2019 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

Selander, et al.        Expires September 9, 2019               [Page 1]
Internet-Draft     Protecting EST payloads with OSCORE        March 2019

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  EST-CoAPs operational differences . . . . . . . . . . . .   3
     1.2.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   4
   2.  Protocol Design and Layering  . . . . . . . . . . . . . . . .   4
   3.  Discovery and URI . . . . . . . . . . . . . . . . . . . . . .   5
   4.  OSCORE-Based Security . . . . . . . . . . . . . . . . . . . .   5
   5.  Proxying  . . . . . . . . . . . . . . . . . . . . . . . . . .   5
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .   6
   7.  Privacy Considerations  . . . . . . . . . . . . . . . . . . .   6
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   6
   9.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .   6
   10. References  . . . . . . . . . . . . . . . . . . . . . . . . .   6
     10.1.  Normative References . . . . . . . . . . . . . . . . . .   6
     10.2.  Informative References . . . . . . . . . . . . . . . . .   7
   Appendix A.  Examples . . . . . . . . . . . . . . . . . . . . . .   8
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   8

1.  Introduction

   One of the challenges with deploying a Public Key Infrastructure
   (PKI) for the Internet of Things (IoT) is certificate enrolment,
   because existing enrolment protocols are not optimized for
   constrained environments [RFC7228].

   One optimization of certificate enrollment targeting IoT deployments
   is specified in EST-CoAPs ([I-D.ietf-ace-coap-est]), which defines a
   version of Enrolment over Secure Transport [RFC7030] for transporting
   EST payloads over CoAP [RFC7252] and DTLS [RFC6347], instead of
   secured HTTP.

   This document describes a method for protecting EST payloads over
   CoAP or HTTP with OSCORE [I-D.ietf-core-object-security].  OSCORE
   specifies an extension to CoAP which protects the application layer
   message and can be applied independently of how CoAP messages are
   transported.  OSCORE can also be applied to CoAP-mappable HTTP which
   enables end-to-end security for mixed CoAP and HTTP transfer of
   application layer data.  Hence EST payloads can be protected end-to-