EAP Extensions for the EAP Re-authentication Protocol (ERP)
RFC 6696

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Internet Engineering Task Force (IETF)                            Z. Cao
Request for Comments: 6696                                  China Mobile
Obsoletes: 5296                                                    B. He
Category: Standards Track                                           CATR
ISSN: 2070-1721                                                   Y. Shi
                                                              Q. Wu, Ed.
                                                                  Huawei
                                                            G. Zorn, Ed.
                                                             Network Zen
                                                               July 2012

      EAP Extensions for the EAP Re-authentication Protocol (ERP)

Abstract

   The Extensible Authentication Protocol (EAP) is a generic framework
   supporting multiple types of authentication methods.  In systems
   where EAP is used for authentication, it is desirable to avoid
   repeating the entire EAP exchange with another authenticator.  This
   document specifies extensions to EAP and the EAP keying hierarchy to
   support an EAP method-independent protocol for efficient re-
   authentication between the peer and an EAP re-authentication server
   through any authenticator.  The re-authentication server may be in
   the home network or in the local network to which the peer is
   connecting.

   This memo obsoletes RFC 5296.

Status of This Memo

   This is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Further information on
   Internet Standards is available in Section 2 of RFC 5741.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   http://www.rfc-editor.org/info/rfc6696.

Cao, et al.                  Standards Track                    [Page 1]
RFC 6696                 EAP Extensions for ERP                July 2012

Copyright Notice

   Copyright (c) 2012 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

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

Cao, et al.                  Standards Track                    [Page 2]
RFC 6696                 EAP Extensions for ERP                July 2012

Table of Contents

   1. Introduction ....................................................4
      1.1. Changes from RFC 5296 ......................................5
   2. Terminology .....................................................5
   3. ERP Description .................................................7
      3.1. ERP with the Home ER Server ...............................10
      3.2. ERP with a Local ER Server ................................11
   4. ER Key Hierarchy ...............................................13
      4.1. rRK Derivation ............................................13
      4.2. rRK Properties ............................................14
      4.3. rIK Derivation ............................................14
      4.4. rIK Properties ............................................15
      4.5. rIK Usage .................................................16
      4.6. rMSK Derivation ...........................................16
      4.7. rMSK Properties ...........................................17
   5. Protocol Details ...............................................17
      5.1. ERP Bootstrapping .........................................17
      5.2. Steps in ERP ..............................................20
           5.2.1. Multiple Simultaneous Runs of ERP ..................23
           5.2.2. ERP Failure Handling ...............................23
      5.3. EAP Codes .................................................25
           5.3.1. EAP-Initiate/Re-auth-Start Packet ..................26
                  5.3.1.1. Authenticator Operation ...................27
                  5.3.1.2. Peer Operation ............................27
           5.3.2. EAP-Initiate/Re-auth Packet ........................28
           5.3.3. EAP-Finish/Re-auth Packet ..........................30
           5.3.4. TV and TLV Attributes ..............................32