Offline usage of ACE
draft-zhu-ace-offline-00

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ACE Working Group                                                 J. Zhu
Internet-Draft                                                    Huawei
Intended status: Informational                            March 13, 2017
Expires: September 14, 2017

                          Offline usage of ACE
                        draft-zhu-ace-offline-00

Abstract

   [I-D.ietf-ace-oauth-authz] defines a framework for both
   authentication and authorization in constrained Internet of Things
   (IoT) environments.  A constrained node in this framework may have
   constraints in computational capability, memory storage, lack of user
   interface, transmission bandwidth and/or power supply.  Battery-
   powered devices are widely used in IoT deployments and they sleep
   most of their lifetime for battery saving.  Hence, they are usually
   disconnected from other nodes.  This draft provides an overview of
   the disconnection use cases and discusses offline authentication and
   authorization solutions.

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
   Task Force (IETF).  Note that other groups may also distribute
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   This Internet-Draft will expire on September 14, 2017.

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   This document is subject to BCP 78 and the IETF Trust's Legal
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   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents

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   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   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
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   4
   3.  Cases . . . . . . . . . . . . . . . . . . . . . . . . . . . .   4
     3.1.  Case 1 Client-AS disconnection  . . . . . . . . . . . . .   5
       3.1.1.  Sub-case 1 Client instructs the RS to obtain
               authorization information from AS . . . . . . . . . .   5
       3.1.2.  Sub-case 2 Introspection Aided Token Validation . . .   7
       3.1.3.  Sub-case 3 RS caches authorization information  . . .   7
     3.2.  RS-AS disconnection . . . . . . . . . . . . . . . . . . .   7
       3.2.1.  Sub-case 1: Local Token Validation  . . . . . . . . .   7
     3.3.  Client-RS disconnection . . . . . . . . . . . . . . . . .   7
   4.  Security Considerations . . . . . . . . . . . . . . . . . . .   8
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   8
   6.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   8
   7.  Changelog . . . . . . . . . . . . . . . . . . . . . . . . . .   8
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   8
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .   8
     8.2.  Informative References  . . . . . . . . . . . . . . . . .   9
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .   9

1.  Introduction

   [I-D.ietf-ace-oauth-authz] defines a framework for both
   authentication and authorization in constrained Internet of Things
   (IoT) environments.  The framework is based on a set of building
   blocks including OAuth 2.0 and CoAP.
   Figure 1/[I-D.ietf-ace-oauth-authz] describes the basic ACE protocol
   flow.  The diagram is repeated below.

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      +--------+                               +---------------+
      |        |---(A)-- Token Request ------->|               |
      |        |                               | Authorization |
      |        |<--(B)-- Access Token ---------|    Server     |
      |        |       + RS Information        |               |
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