EST over secure CoAP (EST-coaps)
draft-ietf-ace-coap-est-18

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ACE                                                      P. van der Stok
Internet-Draft                                                Consultant
Intended status: Standards Track                           P. Kampanakis
Expires: July 9, 2020                                      Cisco Systems
                                                           M. Richardson
                                                                     SSW
                                                                 S. Raza
                                                               RISE SICS
                                                         January 6, 2020

                    EST over secure CoAP (EST-coaps)
                       draft-ietf-ace-coap-est-18

Abstract

   Enrollment over Secure Transport (EST) is used as a certificate
   provisioning protocol over HTTPS.  Low-resource devices often use the
   lightweight Constrained Application Protocol (CoAP) for message
   exchanges.  This document defines how to transport EST payloads over
   secure CoAP (EST-coaps), which allows constrained devices to use
   existing EST functionality for provisioning certificates.

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
   Task Force (IETF).  Note that other groups may also distribute
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at https://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   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 July 9, 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

van der Stok, et al.      Expires July 9, 2020                  [Page 1]
Internet-Draft                  EST-coaps                   January 2020

   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components 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.  Change Log  . . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   7
   3.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   7
   4.  DTLS and conformance to RFC7925 profiles  . . . . . . . . . .   7
   5.  Protocol Design . . . . . . . . . . . . . . . . . . . . . . .  10
     5.1.  Discovery and URIs  . . . . . . . . . . . . . . . . . . .  10
     5.2.  Mandatory/optional EST Functions  . . . . . . . . . . . .  13
     5.3.  Payload formats . . . . . . . . . . . . . . . . . . . . .  13
     5.4.  Message Bindings  . . . . . . . . . . . . . . . . . . . .  15
     5.5.  CoAP response codes . . . . . . . . . . . . . . . . . . .  15
     5.6.  Message fragmentation . . . . . . . . . . . . . . . . . .  16
     5.7.  Delayed Responses . . . . . . . . . . . . . . . . . . . .  17
     5.8.  Server-side Key Generation  . . . . . . . . . . . . . . .  19
   6.  HTTPS-CoAPS Registrar . . . . . . . . . . . . . . . . . . . .  21
   7.  Parameters  . . . . . . . . . . . . . . . . . . . . . . . . .  23
   8.  Deployment limitations  . . . . . . . . . . . . . . . . . . .  23
   9.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  24
     9.1.  Content-Format Registry . . . . . . . . . . . . . . . . .  24
     9.2.  Resource Type registry  . . . . . . . . . . . . . . . . .  24
     9.3.  Well-Known URIs Registry  . . . . . . . . . . . . . . . .  25
   10. Security Considerations . . . . . . . . . . . . . . . . . . .  25
     10.1.  EST server considerations  . . . . . . . . . . . . . . .  25
     10.2.  HTTPS-CoAPS Registrar considerations . . . . . . . . . .  27
   11. Contributors  . . . . . . . . . . . . . . . . . . . . . . . .  28
   12. Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  28
   13. References  . . . . . . . . . . . . . . . . . . . . . . . . .  28
     13.1.  Normative References . . . . . . . . . . . . . . . . . .  28
     13.2.  Informative References . . . . . . . . . . . . . . . . .  30
   Appendix A.  EST messages to EST-coaps  . . . . . . . . . . . . .  32
     A.1.  cacerts . . . . . . . . . . . . . . . . . . . . . . . . .  33
     A.2.  enroll / reenroll . . . . . . . . . . . . . . . . . . . .  35