MQTT-TLS profile of ACE
draft-sengul-ace-mqtt-tls-profile-04
ACE Working Group C. Sengul
Internet-Draft Nominet
Intended status: Standards Track A. Kirby
Expires: October 8, 2019 Oxbotica
P. Fremantle
University of Portsmouth
April 6, 2019
MQTT-TLS profile of ACE
draft-sengul-ace-mqtt-tls-profile-04
Abstract
This document specifies a profile for the ACE (Authentication and
Authorization for Constrained Environments) to enable authorization
in an MQTT-based publish-subscribe messaging system. Proof-of-
possession keys, bound to OAuth2.0 access tokens, are used to
authenticate and authorize publisher and subscriber clients. The
protocol relies on TLS for confidentiality and server authentication.
Status of This Memo
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Internet-Draft MQTT-TLS profile of ACE April 2019
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
1.1. Requirements Language . . . . . . . . . . . . . . . . . . 4
1.2. ACE-Related Terminology . . . . . . . . . . . . . . . . . 4
1.3. MQTT-Related Terminology . . . . . . . . . . . . . . . . 4
2. Basic Protocol Interactions . . . . . . . . . . . . . . . . . 5
2.1. Authorizing Connection Establishment . . . . . . . . . . 6
2.1.1. Client Authorization Server (CAS) and Authorization
Server (AS) Interaction . . . . . . . . . . . . . . . 7
2.1.2. Client Connection Request to the Broker . . . . . . . 8
2.1.3. Token Validation . . . . . . . . . . . . . . . . . . 10
2.1.4. The Broker's Response to Client Connection Request . 11
2.2. Authorizing PUBLISH Messages . . . . . . . . . . . . . . 12
2.2.1. PUBLISH Messages from the Publisher Client to the
Broker . . . . . . . . . . . . . . . . . . . . . . . 12
2.2.2. PUBLISH Messages from the Broker to the Subscriber
Clients . . . . . . . . . . . . . . . . . . . . . . . 12
2.3. Authorizing SUBSCRIBE Messages . . . . . . . . . . . . . 13
2.4. Token Expiration . . . . . . . . . . . . . . . . . . . . 13
2.5. Handling Disconnections and Retained Messages . . . . . . 13
3. Improved Protocol Interactions with MQTT v5 . . . . . . . . . 14
3.1. Token Transport via Authentication Exchange (AUTH) . . . 14
3.2. Authorization Errors and Client Re-authentication . . . . 16
4. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 17
5. Security Considerations . . . . . . . . . . . . . . . . . . . 17
6. Privacy Considerations . . . . . . . . . . . . . . . . . . . 18
7. References . . . . . . . . . . . . . . . . . . . . . . . . . 18
7.1. Normative References . . . . . . . . . . . . . . . . . . 18
7.2. Informative References . . . . . . . . . . . . . . . . . 19
Appendix A. Checklist for profile requirements . . . . . . . . . 20
Appendix B. The Authorization Information Endpoint . . . . . . . 21
Appendix C. Document Updates . . . . . . . . . . . . . . . . . . 21
Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . . 22
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 22
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