EAP Session-Id Derivation
draft-dekok-emu-eap-session-id-00

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Network Working Group                                        DeKok, Alan
INTERNET-DRAFT                                                FreeRADIUS
Updates: 5247
Category: Standards Track
<draft-dekok-emu-eap-session-id-00.txt>
28 January 2019

                       EAP Session-Id Derivation
                 draft-dekok-emu-eap-session-id-00.txt

Abstract

   EAP Session-Id derivation has not been defined for EAP-SIM, EAP-AKA,
   and EAP-AKA' when using the fast re-authentication exchange instead
   of full authentication.  This document updates [RFC5247] to define
   those derivations for EAP-SIM, and EAP-AKA.  [AKAP] defines the
   Session-ID for EAP-AKA', so the definition for EAP-AKA' is not
   included here.  [RFC5247] also does not define Session-Id derivation
   for PEAP.  A definition is given here which follows the definition
   for other TLS-based EAP methods.

Status of this Memo

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

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   This Internet-Draft will expire on July 22, 2019.

Copyright Notice

   Copyright (c) 2019 IETF Trust and the persons identified as the

DeKok, Alan                 Proposed Standard                   [Page 1]
INTERNET-DRAFT          EAP Session-ID Derivation        28 January 2019

   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
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   described in the Simplified BSD License.

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Table of Contents

1.  Introduction .............................................    4
   1.1.  Requirements Language ...............................    4
2.  Updates to RFC 5247 Appendix A ...........................    5
   2.1.  EAP-AKA .............................................    5
   2.2.  EAP-SIM .............................................    5
   2.3.  Rationale ...........................................    6
      2.3.1.  Session-Id for PEAP ............................    7
3.  Security Considerations ..................................    7
4.  IANA Considerations ......................................    7
5.  References ...............................................    7
   5.1.  Normative References ................................    7
   5.2.  Informative References ..............................    8

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1.  Introduction

   EAP [RFC3748] Session-Id derivation has not been defined for EAP-SIM,
   EAP-AKA, and EAP-AKA' when using the fast re-authentication exchange
   instead of full authentication. [RFC5247] defines the Session-Id for
   these EAP methods, but that derivation is only applicable for the
   full authentication case.

   The IEEE is defining FILS authentication [FILS], which needs the EAP
   Session-Id for in order for the EAP Re-authentication Protocol (ERP)
   [RFC5296] to work, it would be important to get this resolved with a
   clearly defined and agreed derivation rules to allow fast re-
   authentication cases to be used to derive ERP key hierarchy.

   Further, [RFC5247] did not define Session-Id for PEAP.  We correct
   that deficiency here.

1.1.  Requirements Language

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
   "OPTIONAL" in this document are to be interpreted as described in BCP
   14 [RFC2119] [RFC8174] when, and only when, they appear in all
   capitals, as shown here.

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