EAP Mutual Cryptographic Binding
draft-ietf-emu-crypto-bind-01

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Document Type Active Internet-Draft (emu WG)
Last updated 2013-01-05
Replaces draft-hartman-emu-mutual-crypto-bind
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Network Working Group                                         S. Hartman
Internet-Draft                                              M. Wasserman
Intended status: Informational                         Painless Security
Expires: July 9, 2013                                           D. Zhang
                                                                  Huawei
                                                         January 5, 2013

                    EAP Mutual Cryptographic Binding
                   draft-ietf-emu-crypto-bind-01.txt

Abstract

   As the Extensible Authentication Protocol (EAP) evolves, EAP peers
   rely increasingly on information received from the EAP server.  EAP
   extensions such as channel binding or network posture information are
   often carried in tunnel methods; peers are likely to rely on this
   information.  EAP has provided a facility that protects tunnel
   methods against man-in-the-middle attacks.  However, cryptographic
   binding focuses on protecting the server rather than the peer.  This
   memo explores attacks possible when the peer is not protected from
   man-in-the-middle attacks and recommends mutual cryptographic
   binding, a new form of cryptographic binding that protects both peer
   and server along with other mitigations.

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 July 9, 2013.

Copyright Notice

   Copyright (c) 2013 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

Hartman, et al.           Expires July 9, 2013                  [Page 1]
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   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
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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  3
   2.  An Example Problem . . . . . . . . . . . . . . . . . . . . . .  5
   3.  The Server insertion Attack  . . . . . . . . . . . . . . . . .  7
     3.1.  Conditions for the Attack  . . . . . . . . . . . . . . . .  7
     3.2.  Mitigation Strategies  . . . . . . . . . . . . . . . . . .  8
       3.2.1.  Server Authentication  . . . . . . . . . . . . . . . .  8
       3.2.2.  Server Policy  . . . . . . . . . . . . . . . . . . . .  9
       3.2.3.  Existing Cryptographic Binding . . . . . . . . . . . . 12
       3.2.4.  IntroducingEMSK-based Cryptographic Binding  . . . . . 13
       3.2.5.  Mix Key into Long-Term Credentials . . . . . . . . . . 14
     3.3.  Intended Intermediates . . . . . . . . . . . . . . . . . . 14
   4.  Recommendations  . . . . . . . . . . . . . . . . . . . . . . . 16
     4.1.  Mutual Cryptographic Binding . . . . . . . . . . . . . . . 16
     4.2.  State Tracking . . . . . . . . . . . . . . . . . . . . . . 16
     4.3.  Certificate Naming . . . . . . . . . . . . . . . . . . . . 16
     4.4.  Inner Mixing . . . . . . . . . . . . . . . . . . . . . . . 17
   5.  Survey of Tunnel Methods . . . . . . . . . . . . . . . . . . . 18
   6.  Survey of Inner Methods  . . . . . . . . . . . . . . . . . . . 19
   7.  Security Considerations  . . . . . . . . . . . . . . . . . . . 20
   8.  Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 21
   9.  References . . . . . . . . . . . . . . . . . . . . . . . . . . 22
     9.1.  Normative References . . . . . . . . . . . . . . . . . . . 22
     9.2.  Informative References . . . . . . . . . . . . . . . . . . 22
   Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 24

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