MQTT-TLS profile of ACE
draft-ietf-ace-mqtt-tls-profile-00
ACE Working Group C. Sengul
Internet-Draft Nominet
Intended status: Standards Track A. Kirby
Expires: November 8, 2019 Oxbotica
P. Fremantle
University of Portsmouth
May 7, 2019
MQTT-TLS profile of ACE
draft-ietf-ace-mqtt-tls-profile-00
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.
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Internet-Draft MQTT-TLS profile of ACE May 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
Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . . 21
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 21
1. Introduction
This document specifies a profile for the ACE framework
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