Echo and Request-Tag
draft-ietf-core-echo-request-tag-01
CoRE Working Group C. Amsuess
Internet-Draft
Updates: 7252, 7959 (if approved) J. Mattsson
Intended status: Standards Track G. Selander
Expires: September 6, 2018 Ericsson AB
March 05, 2018
Echo and Request-Tag
draft-ietf-core-echo-request-tag-01
Abstract
This document specifies several 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 Block options and the Token. 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 September 6, 2018.
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Amsuess, et al. Expires September 6, 2018 [Page 1]
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
1.1. Request Freshness . . . . . . . . . . . . . . . . . . . . 3
1.2. Fragmented Message Body Integrity . . . . . . . . . . . . 3
1.3. Request-Response Binding . . . . . . . . . . . . . . . . 4
1.4. Terminology . . . . . . . . . . . . . . . . . . . . . . . 5
2. The Echo Option . . . . . . . . . . . . . . . . . . . . . . . 5
2.1. Option Format . . . . . . . . . . . . . . . . . . . . . . 5
2.2. Echo Processing . . . . . . . . . . . . . . . . . . . . . 6
2.3. Applications . . . . . . . . . . . . . . . . . . . . . . 8
3. The Request-Tag Option . . . . . . . . . . . . . . . . . . . 9
3.1. Option Format . . . . . . . . . . . . . . . . . . . . . . 9
3.2. Request-Tag Processing . . . . . . . . . . . . . . . . . 10
3.3. Applications . . . . . . . . . . . . . . . . . . . . . . 11
3.3.1. Body Integrity Based on Payload Integrity . . . . . . 11
3.3.2. Multiple Concurrent Blockwise Operations . . . . . . 12
3.4. Rationale for the option properties . . . . . . . . . . . 13
4. Block2 / ETag Processing . . . . . . . . . . . . . . . . . . 14
5. Token Processing . . . . . . . . . . . . . . . . . . . . . . 14
6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 14
7. Security Considerations . . . . . . . . . . . . . . . . . . . 14
8. References . . . . . . . . . . . . . . . . . . . . . . . . . 15
8.1. Normative References . . . . . . . . . . . . . . . . . . 15
8.2. Informative References . . . . . . . . . . . . . . . . . 16
Appendix A. Methods for Generating Echo Option Values . . . . . 17
Appendix B. Request-Tag Message Size Impact . . . . . . . . . . 18
Appendix C. Change Log . . . . . . . . . . . . . . . . . . . . . 18
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 19
1. Introduction
The initial Constrained Application Protocol (CoAP) suite of
specifications ([RFC7252], [RFC7641], and [RFC7959]) was designed
with the assumption that security could be provided on a separate
layer, in particular by using DTLS ([RFC6347]). However, for some
use cases, additional functionality or extra processing is needed to
support secure CoAP operations. This document specifies several
security enhancements to the Constrained Application Protocol (CoAP).
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