Lightweight Authorization for Authenticated Key Exchange.
draft-selander-ace-ake-authz-00

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Network Working Group                                        G. Selander
Internet-Draft                                               J. Mattsson
Intended status: Informational                               Ericsson AB
Expires: August 9, 2020                                       M. Vucinic
                                                                   INRIA
                                                           M. Richardson
                                                Sandelman Software Works
                                                       February 06, 2020

       Lightweight Authorization for Authenticated Key Exchange.
                    draft-selander-ace-ake-authz-00

Abstract

   This document describes a procedure for augmenting an authenticated
   Diffie-Hellman key exchange with third party assisted authorization
   targeting constrained IoT deployments (RFC 7228).

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Problem Description . . . . . . . . . . . . . . . . . . . . .   3
   3.  Assumptions . . . . . . . . . . . . . . . . . . . . . . . . .   4
     3.1.  Device  . . . . . . . . . . . . . . . . . . . . . . . . .   4
     3.2.  Domain Authenticator  . . . . . . . . . . . . . . . . . .   4
     3.3.  AAA Server  . . . . . . . . . . . . . . . . . . . . . . .   4
     3.4.  Lightweight AKE . . . . . . . . . . . . . . . . . . . . .   5
   4.  The Protocol  . . . . . . . . . . . . . . . . . . . . . . . .   5
     4.1.  Device <-> AAA Server . . . . . . . . . . . . . . . . . .   6
     4.2.  Device <-> Authenticator  . . . . . . . . . . . . . . . .   8
     4.3.  Authenticator <-> AAA Server  . . . . . . . . . . . . . .   9
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .  10
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  10
   7.  Informative References  . . . . . . . . . . . . . . . . . . .  11
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  11

1.  Introduction

   For constrained IoT deployments [RFC7228] the overhead contributed by
   security protocols may be significant which motivates the
   specification of lightweight protocols that are optimizing, in
   particular, message overhead (see [I-D.ietf-lake-reqs]).  This
   document describes a lightweight procedure for augmenting an
   authenticated Diffie-Hellman key exchange with third party assisted
   authorization.

   The procedure involves a device, a domain authenticator and a AAA
   server.  The device performs mutual authentication and authorization
   of the authenticator, assisted by the AAA server which provides
   relevant authorization information to the device in the form of a
   "voucher".

   The protocol specified in this document optimizes the message count
   by performing authorization and enrolment in parallel with
   authentication, instead of in sequence which is common for network
   access.  It further reuses protocol elements from the authentication
   protocol leading to reduced message sizes on constrained links.

   The specification assumes a lightweight AKE protocol
   [I-D.ietf-lake-reqs] between device and authenticator, and defines
   the integration of a lightweight authorization procedure.  This
   enables a secure target interaction in few message exchanges.  In
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