Protecting EST Payloads with OSCORE
draft-selander-ace-coap-est-oscore-04

Document Type Active Internet-Draft (individual)
Authors Göran Selander  , Shahid Raza  , Martin Furuhed  , Mališa Vučinić  , Timothy Claeys 
Last updated 2020-11-02
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: 6 May 2021                                                 RISE
                                                              M. Furuhed
                                                                   Nexus
                                                              M. Vucinic
                                                               T. Claeys
                                                                   INRIA
                                                         2 November 2020

                  Protecting EST Payloads with OSCORE
                 draft-selander-ace-coap-est-oscore-04

Abstract

   This document specifies public-key certificate enrollment procedures
   protected with lightweight 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

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
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   Drafts is at https://datatracker.ietf.org/drafts/current/.

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   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on 6 May 2021.

Copyright Notice

   Copyright (c) 2020 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Selander, et al.           Expires 6 May 2021                   [Page 1]
Internet-Draft                 EST-oscore                  November 2020

   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 publication of this document.
   Please review these documents carefully, as they describe your rights
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   extracted from this document must include Simplified BSD License text
   as described in Section 4.e of the Trust Legal Provisions and are
   provided without warranty as described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  Operational Differences with EST-coaps  . . . . . . . . .   4
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   5
   3.  Authentication  . . . . . . . . . . . . . . . . . . . . . . .   5
     3.1.  EDHOC . . . . . . . . . . . . . . . . . . . . . . . . . .   6
     3.2.  Certificate-based Authentication  . . . . . . . . . . . .   6
     3.3.  Channel Binding . . . . . . . . . . . . . . . . . . . . .   6
     3.4.  Optimizations . . . . . . . . . . . . . . . . . . . . . .   7
     3.5.  RPK-based Trust Anchors . . . . . . . . . . . . . . . . .   7
   4.  Protocol Design and Layering  . . . . . . . . . . . . . . . .   8
     4.1.  Discovery and URI . . . . . . . . . . . . . . . . . . . .   8
     4.2.  Distribution of RPKs  . . . . . . . . . . . . . . . . . .   8
     4.3.  Mandatory/optional EST Functions  . . . . . . . . . . . .   9
     4.4.  Payload formats . . . . . . . . . . . . . . . . . . . . .   9
     4.5.  Message Bindings  . . . . . . . . . . . . . . . . . . . .  11
     4.6.  CoAP response codes . . . . . . . . . . . . . . . . . . .  11
     4.7.  Message fragmentation . . . . . . . . . . . . . . . . . .  11
     4.8.  Delayed Responses . . . . . . . . . . . . . . . . . . . .  11
   5.  HTTP-CoAP Proxy . . . . . . . . . . . . . . . . . . . . . . .  12
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .  12
   7.  Privacy Considerations  . . . . . . . . . . . . . . . . . . .  12
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  13
   9.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .  13
   10. References  . . . . . . . . . . . . . . . . . . . . . . . . .  13
     10.1.  Normative References . . . . . . . . . . . . . . . . . .  13
     10.2.  Informative References . . . . . . . . . . . . . . . . .  14
   Appendix A.  Other Authentication Methods . . . . . . . . . . . .  16
     A.1.  TTP Assisted Authentication . . . . . . . . . . . . . . .  16
     A.2.  PSK Based Authentication  . . . . . . . . . . . . . . . .  18
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