EST over secure CoAP (EST-coaps)
draft-ietf-ace-coap-est-00

Document Type Active Internet-Draft (ace WG)
Last updated 2018-02-28
Replaces draft-vanderstok-ace-coap-est
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ACE                                                      P. van der Stok
Internet-Draft                                                Consultant
Intended status: Standards Track                           P. Kampanakis
Expires: September 1, 2018                                 Cisco Systems
                                                                S. Kumar
                                               Philips Lighting Research
                                                           M. Richardson
                                                                     SSW
                                                              M. Furuhed
                                                             Nexus Group
                                                                 S. Raza
                                                               RISE SICS
                                                       February 28, 2018

                    EST over secure CoAP (EST-coaps)
                       draft-ietf-ace-coap-est-00

Abstract

   Enrollment over Secure Transport (EST) [RFC7030] is used as a
   certificate management protocol over HTTPS.

   Low-resource devices often use the lightweight Constrained
   Application Protocol (CoAP) [RFC7252] for message exchanges.  This
   document defines how to transport EST payloads over secure CoAP (EST-
   coaps).  This allows low-resource constrained devices to re-use
   existing EST functionality.  Example low-resource use cases for EST
   are: secure bootstrapping and certificate enrollment.

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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   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on September 1, 2018.

van der Stok, et al.    Expires September 1, 2018               [Page 1]
Internet-Draft                  EST-coaps                  February 2018

Copyright Notice

   Copyright (c) 2018 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
   publication of this document.  Please review these documents
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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  EST operational differences . . . . . . . . . . . . . . .   3
     1.2.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   4
   2.  Conformance to RFC7925 profiles . . . . . . . . . . . . . . .   4
   3.  Protocol Design and Layering  . . . . . . . . . . . . . . . .   5
     3.1.  Payload format  . . . . . . . . . . . . . . . . . . . . .   6
     3.2.  Message Bindings  . . . . . . . . . . . . . . . . . . . .   6
     3.3.  CoAP response codes . . . . . . . . . . . . . . . . . . .   6
     3.4.  Message fragmentation . . . . . . . . . . . . . . . . . .   7
     3.5.  Deployment limits . . . . . . . . . . . . . . . . . . . .   8
   4.  Discovery and URI . . . . . . . . . . . . . . . . . . . . . .   8
   5.  DTLS Transport Protocol . . . . . . . . . . . . . . . . . . .  10
   6.  Proxying  . . . . . . . . . . . . . . . . . . . . . . . . . .  11
   7.  Parameters  . . . . . . . . . . . . . . . . . . . . . . . . .  12
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  12
     8.1.  Content-Format registry . . . . . . . . . . . . . . . . .  12
     8.2.  Resource Type registry  . . . . . . . . . . . . . . . . .  14
   9.  Security Considerations . . . . . . . . . . . . . . . . . . .  15
     9.1.  proxy considerations  . . . . . . . . . . . . . . . . . .  15
     9.2.  EST server considerations . . . . . . . . . . . . . . . .  15
   10. Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  16
   11. Change Log  . . . . . . . . . . . . . . . . . . . . . . . . .  16
   12. References  . . . . . . . . . . . . . . . . . . . . . . . . .  16
     12.1.  Normative References . . . . . . . . . . . . . . . . . .  16
     12.2.  Informative References . . . . . . . . . . . . . . . . .  17
   Appendix A.  EST messages to EST-coaps  . . . . . . . . . . . . .  19
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