MQTT-TLS profile of ACE
draft-sengul-ace-mqtt-tls-profile-01

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Last updated 2017-10-13
Replaces draft-sengul-kirby-ace-mqtt-tls-profile
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ACE Working Group                                              C. Sengul
Internet-Draft                                                  A. Kirby
Intended status: Standards Track                                 Nominet
Expires: April 15, 2018                                     P. Fremantle
                                                University of Portsmouth
                                                        October 12, 2017

                        MQTT-TLS profile of ACE
                  draft-sengul-ace-mqtt-tls-profile-01

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 publishing and subscribing 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 April 15, 2018.

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   Copyright (c) 2017 IETF Trust and the persons identified as the
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Sengul, et al.           Expires April 15, 2018                 [Page 1]
Internet-Draft           MQTT-TLS profile of ACE            October 2017

   include Simplified BSD License text as described in Section 4.e of
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   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
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