Improved Extensible Authentication Protocol Method for 3GPP Mobile Network Authentication and Key Agreement (EAP-AKA')
draft-ietf-emu-rfc5448bis-09

Document Type Active Internet-Draft (emu WG)
Authors Jari Arkko  , Vesa Lehtovirta  , Vesa Torvinen  , Pasi Eronen 
Last updated 2021-01-11
Replaces draft-arkko-eap-rfc5448bis
Stream Internent Engineering Task Force (IETF)
Intended RFC status Informational
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Network Working Group                                           J. Arkko
Internet-Draft                                             V. Lehtovirta
Updates: 5448,4187 (if approved)                             V. Torvinen
Intended status: Informational                                  Ericsson
Expires: July 15, 2021                                         P. Eronen
                                                             Independent
                                                        January 11, 2021

   Improved Extensible Authentication Protocol Method for 3GPP Mobile
          Network Authentication and Key Agreement (EAP-AKA')
                      draft-ietf-emu-rfc5448bis-09

Abstract

   The 3GPP Mobile Network Authentication and Key Agreement (AKA) is an
   authentication mechanism for devices wishing to access mobile
   networks.  RFC 4187 (EAP-AKA) made the use of this mechanism possible
   within the Extensible Authentication Protocol (EAP) framework.  RFC
   5448 (EAP-AKA') was an improved version of EAP-AKA.

   This memo is the most recent specification of EAP-AKA', including,
   for instance, details and references about related to operating EAP-
   AKA' in 5G networks.

   EAP-AKA' differs from EAP-AKA by providing a key derivation function
   that binds the keys derived within the method to the name of the
   access network.  The key derivation function has been defined in the
   3rd Generation Partnership Project (3GPP).  EAP-AKA' allows its use
   in EAP in an interoperable manner.  EAP-AKA' also updates the
   algorithm used in hash functions, as it employs SHA-256 / HMAC-
   SHA-256 instead of SHA-1 / HMAC-SHA-1 as in EAP-AKA.

   This version of EAP-AKA' specification specifies the protocol
   behaviour for both 4G and 5G deployments, whereas the previous
   version only did this for 4G.

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
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at http://datatracker.ietf.org/drafts/current/.

Arkko, et al.             Expires July 15, 2021                 [Page 1]
Internet-Draft                  EAP-AKA'                    January 2021

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on July 15, 2021.

Copyright Notice

   Copyright (c) 2021 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Requirements Language . . . . . . . . . . . . . . . . . . . .   5
   3.  EAP-AKA'  . . . . . . . . . . . . . . . . . . . . . . . . . .   5
     3.1.  AT_KDF_INPUT  . . . . . . . . . . . . . . . . . . . . . .   8
     3.2.  AT_KDF  . . . . . . . . . . . . . . . . . . . . . . . . .  11
     3.3.  Key Derivation  . . . . . . . . . . . . . . . . . . . . .  13
     3.4.  Hash Functions  . . . . . . . . . . . . . . . . . . . . .  15
       3.4.1.  PRF'  . . . . . . . . . . . . . . . . . . . . . . . .  15
       3.4.2.  AT_MAC  . . . . . . . . . . . . . . . . . . . . . . .  15
       3.4.3.  AT_CHECKCODE  . . . . . . . . . . . . . . . . . . . .  15
     3.5.  Summary of Attributes for EAP-AKA'  . . . . . . . . . . .  16
   4.  Bidding Down Prevention for EAP-AKA . . . . . . . . . . . . .  18
     4.1.  Summary of Attributes for EAP-AKA . . . . . . . . . . . .  20
   5.  Peer Identities . . . . . . . . . . . . . . . . . . . . . . .  20
     5.1.  Username Types in EAP-AKA' Identities . . . . . . . . . .  20
     5.2.  Generating Pseudonyms and Fast Re-Authentication
           Identities  . . . . . . . . . . . . . . . . . . . . . . .  21
     5.3.  Identifier Usage in 5G  . . . . . . . . . . . . . . . . .  22
       5.3.1.  Key Derivation  . . . . . . . . . . . . . . . . . . .  23
       5.3.2.  EAP Identity Response and EAP-AKA' AT_IDENTITY
               Attribute . . . . . . . . . . . . . . . . . . . . . .  24
   6.  Exported Parameters . . . . . . . . . . . . . . . . . . . . .  24
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