Network Working Group                                      N. Cam-Winget
Internet-Draft                                                   H. Zhou
Intended status: Standards Track                           Cisco Systems
Expires: July 7, 2011                                    January 3, 2011


                            EAP TLV for NEA
                    draft-cam-winget-eap-nea-tlv-02

Abstract

   This document describes how Network Endpoint Assessment (NEA) data
   can be carried inside of a general Type-Length-Value container using
   EAP-TLV.

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   This Internet-Draft will expire on July 7, 2011.

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   This document may contain material from IETF Documents or IETF



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   Contributions published or made publicly available before November
   10, 2008.  The person(s) controlling the copyright in some of this
   material may not have granted the IETF Trust the right to allow
   modifications of such material outside the IETF Standards Process.
   Without obtaining an adequate license from the person(s) controlling
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   outside the IETF Standards Process, and derivative works of it may
   not be created outside the IETF Standards Process, except to format
   it for publication as an RFC or to translate it into languages other
   than English.


Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . . . 3
   2.  Specification Requirements  . . . . . . . . . . . . . . . . . . 3
   3.  EAP NEA TLV Format  . . . . . . . . . . . . . . . . . . . . . . 3
   4.  Capabilities and Limitations of EAP-TLV as a PT for PB-TNC  . . 5
   5.  Security Considerations . . . . . . . . . . . . . . . . . . . . 5
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 5
   7.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . . . 5
   8.  Normative References  . . . . . . . . . . . . . . . . . . . . . 5
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . . . 6




























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1.  Introduction

   NEA has standardized a transport agnostic Posture Broker protocol
   defined in [RFC5793] to effect a network endpoint assessment between
   a Posture Broker Client and a Posture Broker Server.  The Extensible
   Authentication Protocol (EAP) [RFC3748] defines an authentication
   transport mechanism that can be extended to transport the Posture
   Broker Protocol. [draft-cam-winget-eap-tlv-01] defines an EAP-TLV
   container to carry arbitrary data within an EAP method.

   This document describes an EAP-TLV that can be used to carry Posture
   Broker messages within an EAP method.  This document also describes
   the capabilities and limitations of EAP as a transport mechanism for
   carrying NEA protocols.


2.  Specification Requirements

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in [RFC2119] .


3.  EAP NEA TLV Format

   The NEA EAP TLV Format is defined and described below.  The fields
   are transmitted from left to right.

    0                   1                   2                   3
    0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |M|R|            TLV Type       |            Length             |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |   Version    |   Reserved     |       PB-TNC Header           |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |        PB-TNC Header          |     PB-PA Message...          |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
   |                                                               |
   |                        PB-PA-Message...                       |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+




      M






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         0  Optional TLV

         1  Mandatory TLV


      R

         Reserved, set to zero (0)


      TLV Type

         The EAP NEA TLV type:


         TBD


      Length

         The length of the Value field in octets.


      Version

         The one octet version of the EAP NEA TLV:


         1

      Reserved

         Reserved octect, must be set to 0x00


      PB-TNC Header

         The PB-TNC encapsulation header as described in [RFC5793].

      PB-PA Message

         The message between the Posture Broker Client and Posture
         Broker Server as described in [RFC5793].








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4.  Capabilities and Limitations of EAP-TLV as a PT for PB-TNC

   TBD


5.  Security Considerations

   The EAP NEA TLV container carries network endpoint assessment
   information between the Posture Broker Client and the Posture Broker
   Server.  As some of this data can be sensitive, it is highly
   recommended that the EAP NEA TLV container MUST be carried inside a
   protected EAP tunneled method.

   To address the potential man-in-the-middle attack in a tunneled EAP
   method, the 'tls-unique' Channel Binding as defined in [RFC5929] MUST
   be used.


6.  IANA Considerations

   The IANA is hereby requested to create a new registry for the EAP NEA
   TLV defined in Section 3.  The purpose of this registry is uniquely
   identify when NEA Posture Broker Protocol packets are being
   transported in an EAP method.


7.  Acknowledgements

   The authors would like to recognize Joe Salowey, Susan Thomson, Syam
   Appala and Subbu Srinivasan for providing input into this draft.


8.  Normative References

   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", BCP 14, RFC 2119, March 1997.

   [RFC2434]  Narten, T. and H. Alvestrand, "Guidelines for Writing an
              IANA Considerations Section in RFCs", BCP 26, RFC 2434,
              October 1998.

   [RFC3748]  Aboba, B., Blunk, L., Vollbrecht, J., Carlson, J., and H.
              Levkowetz, "Extensible Authentication Protocol (EAP)",
              RFC 3748, June 2004.

   [RFC4493]  Song, JH., Poovendran, R., Lee, J., and T. Iwata, "The
              AES-CMAC Algorithm", RFC 4493, June 2006.




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   [RFC5793]  Sahita, R., Hanna, S., Hurst, R., and K. Narayan, "PB-TNC:
              A Posture Broker (PB) Protocol Compatible with Trusted
              Network Connect (TNC)", RFC 5793, March 2010.

   [RFC5929]  Altman, J., Williams, N., and L. Zhu, "Channel Bindings
              for TLS", RFC 5929, July 2010.


Authors' Addresses

   Nancy Cam-Winget
   Cisco Systems
   80 West Tasman Drive
   San Jose, CA  95134
   US

   Email: ncamwing@cisco.com


   Hao Zhou
   Cisco Systems
   4125 Highlander Parkway
   Richfield, OH  44286
   US

   Email: hzhou@cisco.com

























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