Nimble out-of-band authentication for EAP (EAP-NOOB)
draft-ietf-emu-eap-noob-03

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Network Working Group                                            T. Aura
Internet-Draft                                          Aalto University
Intended status: Standards Track                                M. Sethi
Expires: June 16, 2021                                          Ericsson
                                                             A. Peltonen
                                                        Aalto University
                                                       December 13, 2020

          Nimble out-of-band authentication for EAP (EAP-NOOB)
                       draft-ietf-emu-eap-noob-03

Abstract

   The Extensible Authentication Protocol (EAP) provides support for
   multiple authentication methods.  This document defines the EAP-NOOB
   authentication method for nimble out-of-band (OOB) authentication and
   key derivation.  The EAP method is intended for bootstrapping all
   kinds of Internet-of-Things (IoT) devices that have no pre-configured
   authentication credentials.  The method makes use of a user-assisted
   one-directional OOB message between the peer device and
   authentication server to authenticate the in-band key exchange.  The
   device must have an input or output interface, such as a display,
   microphone, speaker or blinking light, which can send or receive
   dynamically generated messages of tens of bytes in length.

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 June 16, 2021.

Copyright Notice

   Copyright (c) 2020 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Aura, et al.              Expires June 16, 2021                 [Page 1]
Internet-Draft                  EAP-NOOB                   December 2020

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   4
   3.  EAP-NOOB protocol . . . . . . . . . . . . . . . . . . . . . .   5
     3.1.  Protocol overview . . . . . . . . . . . . . . . . . . . .   5
     3.2.  Protocol messages and sequences . . . . . . . . . . . . .   8
       3.2.1.  Common handshake in all EAP-NOOB exchanges  . . . . .   8
       3.2.2.  Initial Exchange  . . . . . . . . . . . . . . . . . .  10
       3.2.3.  OOB Step  . . . . . . . . . . . . . . . . . . . . . .  11
       3.2.4.  Completion Exchange . . . . . . . . . . . . . . . . .  13
       3.2.5.  Waiting Exchange  . . . . . . . . . . . . . . . . . .  15
     3.3.  Protocol data fields  . . . . . . . . . . . . . . . . . .  16
       3.3.1.  Peer identifier and NAI . . . . . . . . . . . . . . .  16
       3.3.2.  Message data fields . . . . . . . . . . . . . . . . .  18
     3.4.  Fast reconnect and rekeying . . . . . . . . . . . . . . .  23
       3.4.1.  Persistent EAP-NOOB association . . . . . . . . . . .  23
       3.4.2.  Reconnect Exchange  . . . . . . . . . . . . . . . . .  24
       3.4.3.  User reset  . . . . . . . . . . . . . . . . . . . . .  27
     3.5.  Key derivation  . . . . . . . . . . . . . . . . . . . . .  28
     3.6.  Error handling  . . . . . . . . . . . . . . . . . . . . .  31
       3.6.1.  Invalid messages  . . . . . . . . . . . . . . . . . .  33
       3.6.2.  Unwanted peer . . . . . . . . . . . . . . . . . . . .  33
       3.6.3.  State mismatch  . . . . . . . . . . . . . . . . . . .  33
       3.6.4.  Negotiation failure . . . . . . . . . . . . . . . . .  33
       3.6.5.  Cryptographic verification failure  . . . . . . . . .  34
       3.6.6.  Application-specific failure  . . . . . . . . . . . .  34
   4.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  35
     4.1.  Cryptosuites  . . . . . . . . . . . . . . . . . . . . . .  35
     4.2.  Message Types . . . . . . . . . . . . . . . . . . . . . .  36