Notification of Revoked Access Tokens in the Authentication and Authorization for Constrained Environments (ACE) Framework
draft-tiloca-ace-revoked-token-notification-01

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Last updated 2020-03-09
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ACE Working Group                                              M. Tiloca
Internet-Draft                                                   RISE AB
Intended status: Standards Track                                L. Seitz
Expires: September 10, 2020                                    Combitech
                                                            F. Palombini
                                                             Ericsson AB
                                                           S. Echeverria
                                                                G. Lewis
                                                                 CMU SEI
                                                          March 09, 2020

    Notification of Revoked Access Tokens in the Authentication and
       Authorization for Constrained Environments (ACE) Framework
             draft-tiloca-ace-revoked-token-notification-01

Abstract

   This document specifies a method of the Authentication and
   Authorization for Constrained Environments (ACE) framework, which
   allows an Authorization Server to notify Clients and Resource Servers
   (i.e., registered devices) about revoked Access Tokens.  The method
   relies on resource observation for the Constrained Application
   Protocol (CoAP), with Clients and Resource Servers observing a Token
   Revocation List on the Authorization Server.  Resulting unsolicited
   notifications of revoked Access Tokens complement alternative
   approaches such as token introspection, while not requiring
   additional endpoints on Clients and Resource Servers.

Status of This Memo

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   provisions of BCP 78 and BCP 79.

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   This Internet-Draft will expire on September 10, 2020.

Tiloca, et al.         Expires September 10, 2020               [Page 1]
Internet-Draft    Notification of Revoked Tokens in ACE       March 2020

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Protocol Overview . . . . . . . . . . . . . . . . . . . . . .   5
   3.  Token Hash  . . . . . . . . . . . . . . . . . . . . . . . . .   6
   4.  The TRL Resource  . . . . . . . . . . . . . . . . . . . . . .   7
     4.1.  Update of the TRL Resource  . . . . . . . . . . . . . . .   7
   5.  The TRL Endpoint  . . . . . . . . . . . . . . . . . . . . . .   7
     5.1.  Full Query of the TRL . . . . . . . . . . . . . . . . . .   8
     5.2.  Diff Query of the TRL . . . . . . . . . . . . . . . . . .   9
   6.  Upon Registration . . . . . . . . . . . . . . . . . . . . . .  10
   7.  Notification of Revoked Tokens  . . . . . . . . . . . . . . .  11
   8.  Example . . . . . . . . . . . . . . . . . . . . . . . . . . .  11
   9.  Security Considerations . . . . . . . . . . . . . . . . . . .  13
   10. IANA Considerations . . . . . . . . . . . . . . . . . . . . .  14
   11. References  . . . . . . . . . . . . . . . . . . . . . . . . .  14
     11.1.  Normative References . . . . . . . . . . . . . . . . . .  14
     11.2.  Informative References . . . . . . . . . . . . . . . . .  15
   Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . .  15
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  15

1.  Introduction

   Authentication and Authorization for Constrained Environments (ACE)
   [I-D.ietf-ace-oauth-authz] is a framework that enforces access
   control on IoT devices acting as Resource Servers.  In order to use
   ACE, both Clients and Resource Servers have to register with an
   Authorization Server and become a registered device.  Once
   registered, a Client can send a request to the Authorization Server
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