Echo and Request-Tag
draft-ietf-core-echo-request-tag-03
CoRE Working Group C. Amsuess
Internet-Draft
Updates: 7252 (if approved) J. Mattsson
Intended status: Standards Track G. Selander
Expires: April 25, 2019 Ericsson AB
October 22, 2018
Echo and Request-Tag
draft-ietf-core-echo-request-tag-03
Abstract
This document specifies security enhancements to the Constrained
Application Protocol (CoAP). Two optional extensions are defined:
the Echo option and the Request-Tag option. Each of these options
provide additional features to CoAP and protects against certain
attacks. The document also updates the processing requirements on
the Token of RFC 7252. The updated Token processing ensures secure
binding of responses to requests.
Status of This Memo
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This Internet-Draft will expire on April 25, 2019.
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Amsuess, et al. Expires April 25, 2019 [Page 1]
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
1.1. Request Freshness . . . . . . . . . . . . . . . . . . . . 3
1.2. Fragmented Message Body Integrity . . . . . . . . . . . . 4
1.3. Request-Response Binding . . . . . . . . . . . . . . . . 4
1.4. Terminology . . . . . . . . . . . . . . . . . . . . . . . 5
2. The Echo Option . . . . . . . . . . . . . . . . . . . . . . . 6
2.1. Option Format . . . . . . . . . . . . . . . . . . . . . . 6
2.2. Echo Processing . . . . . . . . . . . . . . . . . . . . . 7
2.3. Applications . . . . . . . . . . . . . . . . . . . . . . 9
3. The Request-Tag Option . . . . . . . . . . . . . . . . . . . 11
3.1. Option Format . . . . . . . . . . . . . . . . . . . . . . 11
3.2. Request-Tag Processing by Servers . . . . . . . . . . . . 12
3.3. Setting the Request-Tag . . . . . . . . . . . . . . . . . 13
3.4. Applications . . . . . . . . . . . . . . . . . . . . . . 13
3.4.1. Body Integrity Based on Payload Integrity . . . . . . 13
3.4.2. Multiple Concurrent Blockwise Operations . . . . . . 14
3.4.3. Simplified Block-Wise Handling for Constrained
Proxies . . . . . . . . . . . . . . . . . . . . . . . 15
3.5. Rationale for the Option Properties . . . . . . . . . . . 15
3.6. Rationale for Introducing the Option . . . . . . . . . . 16
4. Block2 / ETag Processing . . . . . . . . . . . . . . . . . . 16
5. Token Processing . . . . . . . . . . . . . . . . . . . . . . 16
6. Security Considerations . . . . . . . . . . . . . . . . . . . 16
7. Privacy Considerations . . . . . . . . . . . . . . . . . . . 17
8. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 18
9. References . . . . . . . . . . . . . . . . . . . . . . . . . 18
9.1. Normative References . . . . . . . . . . . . . . . . . . 18
9.2. Informative References . . . . . . . . . . . . . . . . . 18
Appendix A. Methods for Generating Echo Option Values . . . . . 20
Appendix B. Request-Tag Message Size Impact . . . . . . . . . . 21
Appendix C. Change Log . . . . . . . . . . . . . . . . . . . . . 21
Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . . 22
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 22
1. Introduction
The initial Constrained Application Protocol (CoAP) suite of
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