EST over secure CoAP (EST-coaps)
draft-ietf-ace-coap-est-15
ACE P. van der Stok
Internet-Draft Consultant
Intended status: Standards Track P. Kampanakis
Expires: April 2, 2020 Cisco Systems
M. Richardson
SSW
S. Raza
RISE SICS
September 30, 2019
EST over secure CoAP (EST-coaps)
draft-ietf-ace-coap-est-15
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
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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 April 2, 2020.
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 April 2, 2020 [Page 1]
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described in the Simplified BSD License.
Table of Contents
1. Change Log . . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 6
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 . . . . . . . . . . . . 12
5.3. Payload formats . . . . . . . . . . . . . . . . . . . . . 13
5.4. Message Bindings . . . . . . . . . . . . . . . . . . . . 14
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 . . . . . . . . . . . . . . . . . . . . . . . . . 22
8. Deployment limitations . . . . . . . . . . . . . . . . . . . 23
9. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 23
9.1. Content-Format Registry . . . . . . . . . . . . . . . . . 24
9.2. Resource Type registry . . . . . . . . . . . . . . . . . 24
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
A.3. serverkeygen . . . . . . . . . . . . . . . . . . . . . . 36
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