MQTT-TLS profile of ACE
draft-sengul-ace-mqtt-tls-profile-02

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ACE Working Group                                              C. Sengul
Internet-Draft                                                  A. Kirby
Intended status: Standards Track                                 Nominet
Expires: October 12, 2018                                   P. Fremantle
                                                University of Portsmouth
                                                          April 10, 2018

                        MQTT-TLS profile of ACE
                  draft-sengul-ace-mqtt-tls-profile-02

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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   This Internet-Draft will expire on October 12, 2018.

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   Copyright (c) 2018 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

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Sengul, et al.          Expires October 12, 2018                [Page 1]
Internet-Draft           MQTT-TLS profile of ACE              April 2018

   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

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  . . . . . . . . . . . . . .  11
       2.2.1.  PUBLISH messages from the publisher client to the
               broker  . . . . . . . . . . . . . . . . . . . . . . .  11
       2.2.2.  PUBLISH messages from the broker to the subscriber
               clients . . . . . . . . . . . . . . . . . . . . . . .  12
     2.3.  Authorizing SUBSCRIBE messages  . . . . . . . . . . . . .  12
     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 . . . . . . . . . . . . . . . . . . . . .  16
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .  16
   6.  Privacy Considerations  . . . . . . . . . . . . . . . . . . .  17
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  17
     7.1.  Normative References  . . . . . . . . . . . . . . . . . .  17
     7.2.  Informative References  . . . . . . . . . . . . . . . . .  17
   Appendix A.  Checklist for profile requirements . . . . . . . . .  18
   Appendix B.  The authorization information endpoint . . . . . . .  19
   Appendix C.  Document Updates . . . . . . . . . . . . . . . . . .  19
   Acknowledgements  . . . . . . . . . . . . . . . . . . . . . . . .  20
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  20

1.  Introduction

   This document specifies a profile for the ACE framework