Perfect-Forward Secrecy for the Extensible Authentication Protocol Method for Authentication and Key Agreement (EAP-AKA' PFS)
draft-ietf-emu-aka-pfs-00

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Network Working Group                                           J. Arkko
Internet-Draft                                                K. Norrman
Intended status: Informational                               V. Torvinen
Expires: January 26, 2020                                       Ericsson
                                                           July 25, 2019

   Perfect-Forward Secrecy for the Extensible Authentication Protocol
       Method for Authentication and Key Agreement (EAP-AKA' PFS)
                       draft-ietf-emu-aka-pfs-00

Abstract

   Many different attacks have been reported as part of revelations
   associated with pervasive surveillance.  Some of the reported attacks
   involved compromising smart cards, such as attacking SIM card
   manufacturers and operators in an effort to compromise shared secrets
   stored on these cards.  Since the publication of those reports,
   manufacturing and provisioning processes have gained much scrutiny
   and have improved.  However, the danger of resourceful attackers for
   these systems is still a concern.

   This specification is an optional extension to the EAP-AKA'
   authentication method which was defined in RFC 5448 (to be superseded
   by draft-ietf-emu-rfc5448bis).  The extension, when negotiated,
   provides Perfect Forward Secrecy for the session key generated as a
   part of the authentication run in EAP-AKA'.  This prevents an
   attacker who has gained access to the long-term pre-shared secret in
   a SIM card from being able to decrypt all past communications.  In
   addition, if the attacker stays merely a passive eavesdropper, the
   extension prevents attacks against future sessions.  This forces
   attackers to use active attacks instead.

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
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   Drafts is at http://datatracker.ietf.org/drafts/current/.

   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."

Arkko, et al.           Expires January 26, 2020                [Page 1]
Internet-Draft                EAP-AKA' PFS                     July 2019

   This Internet-Draft will expire on January 26, 2020.

Copyright Notice

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   document authors.  All rights reserved.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Protocol Design and Deployment Objectives . . . . . . . . . .   4
   3.  Background  . . . . . . . . . . . . . . . . . . . . . . . . .   5
     3.1.  AKA . . . . . . . . . . . . . . . . . . . . . . . . . . .   5
     3.2.  EAP-AKA' Protocol . . . . . . . . . . . . . . . . . . . .   6
     3.3.  Attacks Against Long-Term Shared Secrets in Smart Cards .   7
   4.  Requirements Language . . . . . . . . . . . . . . . . . . . .   7
   5.  Protocol Overview . . . . . . . . . . . . . . . . . . . . . .   8
   6.  Extensions to EAP-AKA'  . . . . . . . . . . . . . . . . . . .  10
     6.1.  AT_PUB_ECDHE  . . . . . . . . . . . . . . . . . . . . . .  10
     6.2.  AT_KDF_PFS  . . . . . . . . . . . . . . . . . . . . . . .  11
     6.3.  New Key Derivation Function . . . . . . . . . . . . . . .  13
     6.4.  ECDHE Groups  . . . . . . . . . . . . . . . . . . . . . .  14
     6.5.  Message Processing  . . . . . . . . . . . . . . . . . . .  14
       6.5.1.  EAP-Request/AKA'-Identity . . . . . . . . . . . . . .  15
       6.5.2.  EAP-Response/AKA'-Identity  . . . . . . . . . . . . .  15
       6.5.3.  EAP-Request/AKA'-Challenge  . . . . . . . . . . . . .  15
       6.5.4.  EAP-Response/AKA'-Challenge . . . . . . . . . . . . .  15
       6.5.5.  EAP-Request/AKA'-Reauthentication . . . . . . . . . .  16
       6.5.6.  EAP-Response/AKA'-Reauthentication  . . . . . . . . .  16
       6.5.7.  EAP-Response/AKA'-Synchronization-Failure . . . . . .  16
       6.5.8.  EAP-Response/AKA'-Authentication-Reject . . . . . . .  17
       6.5.9.  EAP-Response/AKA'-Client-Error  . . . . . . . . . . .  17