EST over secure CoAP (EST-coaps)
draft-ietf-ace-coap-est-10

Document Type Active Internet-Draft (ace WG)
Last updated 2019-03-08
Replaces draft-vanderstok-ace-coap-est
Stream IETF
Intended RFC status Proposed Standard
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On Agenda ace at IETF-104
Document shepherd Jim Schaad
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Send notices to Jim Schaad <ietf@augustcellars.com>
ACE                                                      P. van der Stok
Internet-Draft                                                Consultant
Intended status: Standards Track                           P. Kampanakis
Expires: September 9, 2019                                 Cisco Systems
                                                           M. Richardson
                                                                     SSW
                                                                 S. Raza
                                                               RISE SICS
                                                           March 8, 2019

                    EST over secure CoAP (EST-coaps)
                       draft-ietf-ace-coap-est-10

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
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   This Internet-Draft will expire on September 9, 2019.

Copyright Notice

   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
   (https://trustee.ietf.org/license-info) in effect on the date of

van der Stok, et al.    Expires September 9, 2019               [Page 1]
Internet-Draft                  EST-coaps                     March 2019

   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  . . . . . . . . . . . . . . . . . . . . . . . .   6
   3.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   6
   4.  DTLS and conformance to RFC7925 profiles  . . . . . . . . . .   7
   5.  Protocol Design . . . . . . . . . . . . . . . . . . . . . . .   9
     5.1.  Discovery and URIs  . . . . . . . . . . . . . . . . . . .   9
     5.2.  Mandatory/optional EST Functions  . . . . . . . . . . . .  12
     5.3.  Payload formats . . . . . . . . . . . . . . . . . . . . .  12
     5.4.  Message Bindings  . . . . . . . . . . . . . . . . . . . .  13
     5.5.  CoAP response codes . . . . . . . . . . . . . . . . . . .  14
     5.6.  Message fragmentation . . . . . . . . . . . . . . . . . .  15
     5.7.  Delayed Responses . . . . . . . . . . . . . . . . . . . .  16
     5.8.  Server-side Key Generation  . . . . . . . . . . . . . . .  18
   6.  HTTPS-CoAPS Registrar . . . . . . . . . . . . . . . . . . . .  19
   7.  Parameters  . . . . . . . . . . . . . . . . . . . . . . . . .  21
   8.  Deployment limitations  . . . . . . . . . . . . . . . . . . .  22
   9.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  22
     9.1.  Content-Format Registry . . . . . . . . . . . . . . . . .  22
     9.2.  Resource Type registry  . . . . . . . . . . . . . . . . .  23
   10. Security Considerations . . . . . . . . . . . . . . . . . . .  23
     10.1.  EST server considerations  . . . . . . . . . . . . . . .  23
     10.2.  HTTPS-CoAPS Registrar considerations . . . . . . . . . .  25
   11. Contributors  . . . . . . . . . . . . . . . . . . . . . . . .  26
   12. Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  26
   13. References  . . . . . . . . . . . . . . . . . . . . . . . . .  26
     13.1.  Normative References . . . . . . . . . . . . . . . . . .  26
     13.2.  Informative References . . . . . . . . . . . . . . . . .  28
   Appendix A.  EST messages to EST-coaps  . . . . . . . . . . . . .  30
     A.1.  cacerts . . . . . . . . . . . . . . . . . . . . . . . . .  31
     A.2.  enroll / reenroll . . . . . . . . . . . . . . . . . . . .  32
     A.3.  serverkeygen  . . . . . . . . . . . . . . . . . . . . . .  34
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