Protecting EST Payloads with OSCORE
draft-selander-ace-coap-est-oscore-03
ACE Working Group G. Selander
Internet-Draft Ericsson AB
Intended status: Standards Track S. Raza
Expires: September 10, 2020 RISE
M. Furuhed
Nexus
M. Vucinic
T. Claeys
INRIA
March 09, 2020
Protecting EST Payloads with OSCORE
draft-selander-ace-coap-est-oscore-03
Abstract
This document specifies public-key certificate enrollment procedures
protected with 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
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This Internet-Draft will expire on September 10, 2020.
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document authors. All rights reserved.
Selander, et al. Expires September 10, 2020 [Page 1]
Internet-Draft EST-oscore March 2020
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1. EST-coaps operational differences . . . . . . . . . . . . 3
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 4
3. OSCORE and Authenticated Key Establishment . . . . . . . . . 4
3.1. EDHOC . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4. Protocol Design and Layering . . . . . . . . . . . . . . . . 6
4.1. Discovery and URI . . . . . . . . . . . . . . . . . . . . 6
4.2. Mandatory/optional EST Functions . . . . . . . . . . . . 6
4.3. Payload formats . . . . . . . . . . . . . . . . . . . . . 7
4.4. Message Bindings . . . . . . . . . . . . . . . . . . . . 8
4.5. CoAP response codes . . . . . . . . . . . . . . . . . . . 9
4.6. Message fragmentation . . . . . . . . . . . . . . . . . . 9
4.7. Delayed Responses . . . . . . . . . . . . . . . . . . . . 9
5. HTTP-CoAP registrar . . . . . . . . . . . . . . . . . . . . . 9
6. Security Considerations . . . . . . . . . . . . . . . . . . . 10
7. Privacy Considerations . . . . . . . . . . . . . . . . . . . 10
8. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 10
9. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 10
10. References . . . . . . . . . . . . . . . . . . . . . . . . . 10
10.1. Normative References . . . . . . . . . . . . . . . . . . 10
10.2. Informative References . . . . . . . . . . . . . . . . . 11
Appendix A. Other Authentication Methods . . . . . . . . . . . . 13
A.1. TTP Assisted Authentication . . . . . . . . . . . . . . . 13
A.2. PSK Based Authentication . . . . . . . . . . . . . . . . 14
A.3. EDHOC with alternative authentication methods . . . . . . 15
Appendix B. CBOR Encoding of EST Payloads . . . . . . . . . . . 15
B.1. Distribution of CA Certificates (/crts) . . . . . . . . . 15
B.2. Enrollment/Re-enrollment of Clients (/sen, /sren) . . . . 16
B.2.1. CBOR Certificate Request Examples . . . . . . . . . . 16
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