Notification of Revoked Access Tokens in the Authentication and Authorization for Constrained Environments (ACE) Framework
draft-tiloca-ace-revoked-token-notification-00

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Last updated 2019-11-04
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ACE Working Group                                              M. Tiloca
Internet-Draft                                                  L. Seitz
Intended status: Standards Track                                 RISE AB
Expires: May 7, 2020                                        F. Palombini
                                                             Ericsson AB
                                                           S. Echeverria
                                                                G. Lewis
                                                                 CMU SEI
                                                       November 04, 2019

    Notification of Revoked Access Tokens in the Authentication and
       Authorization for Constrained Environments (ACE) Framework
             draft-tiloca-ace-revoked-token-notification-00

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
   dedicated, device-specific 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

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
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   This Internet-Draft will expire on May 7, 2020.

Tiloca, et al.             Expires May 7, 2020                  [Page 1]
Internet-Draft    Notification of Revoked Tokens in ACE    November 2019

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Protocol Overview . . . . . . . . . . . . . . . . . . . . . .   4
   3.  Upon Device Registration  . . . . . . . . . . . . . . . . . .   4
   4.  Notification of Revoked Tokens  . . . . . . . . . . . . . . .   5
   5.  Example . . . . . . . . . . . . . . . . . . . . . . . . . . .   6
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .   7
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   7
   8.  Normative References  . . . . . . . . . . . . . . . . . . . .   8
   Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . .   9
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   9

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 (AS) and become a registered device.  Once
   registered, a Client can send a request to the AS for an Access Token
   for a Resource Server (RS).  For a Client to access the RS, the
   Client must present the issued Access Token at the RS, which then
   validates and stores it.

   Even though Access Tokens have expiration times, there are
   circumstances by which an Access Token may need to be revoked before
   its expiration time, such as: (1) a registered device has been
   compromised, or is suspected of being compromised; (2) a registered
   device is decommissioned; (3) there has been a change of access
   policies for a registered device; and (4) there has been a change in
   the ACE profile for a registered device.
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