Integrity Protection for Network Service Header (NSH) and Encryption of Sensitive Metadata
draft-rebo-sfc-nsh-integrity-01

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SFC                                                         M. Boucadair
Internet-Draft                                                    Orange
Intended status: Standards Track                                T. Reddy
Expires: May 7, 2020                                              McAfee
                                                       November 04, 2019

Integrity Protection for Network Service Header (NSH) and Encryption of
                           Sensitive Metadata
                    draft-rebo-sfc-nsh-integrity-01

Abstract

   This specification adds integrity protection and optional encryption
   directly to Network Service Headers (NSH) used for Service Function
   Chaining (SFC).

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   This Internet-Draft will expire on May 7, 2020.

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Boucadair & Reddy          Expires May 7, 2020                  [Page 1]
Internet-Draft        Intgerity Protection for NSH         November 2019

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Assumptions & Basic Requirements  . . . . . . . . . . . . . .   4
   4.  Solution Overview . . . . . . . . . . . . . . . . . . . . . .   6
   5.  Mandatory to Implement AEAD Algorithms  . . . . . . . . . . .   8
   6.  New NSH Variable-Length Context Headers . . . . . . . . . . .   8
     6.1.  Key Identifier Context Header . . . . . . . . . . . . . .   9
     6.2.  Sequence Number Context Header  . . . . . . . . . . . . .   9
     6.3.  MAC and Encrypted Metadata Context Header . . . . . . . .  10
       6.3.1.  MAC#1 Context Header  . . . . . . . . . . . . . . . .  11
       6.3.2.  MAC#2 Context Header  . . . . . . . . . . . . . . . .  12
   7.  Processing Rules  . . . . . . . . . . . . . . . . . . . . . .  13
     7.1.  Generic Behavior  . . . . . . . . . . . . . . . . . . . .  13
     7.2.  MAC NSH Data Generation . . . . . . . . . . . . . . . . .  14
     7.3.  Encrypted NSH Metadata Generation . . . . . . . . . . . .  14
     7.4.  Sequence Number Validation for Replay Attack  . . . . . .  15
     7.5.  NSH Data Validation . . . . . . . . . . . . . . . . . . .  15
     7.6.  Decryption of NSH Metadata  . . . . . . . . . . . . . . .  16
   8.  Security Considerations . . . . . . . . . . . . . . . . . . .  16
     8.1.  MAC#1 . . . . . . . . . . . . . . . . . . . . . . . . . .  17
     8.2.  MAC#2 . . . . . . . . . . . . . . . . . . . . . . . . . .  17
   9.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  17
   10. Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  18
   11. References  . . . . . . . . . . . . . . . . . . . . . . . . .  18
     11.1.  Normative References . . . . . . . . . . . . . . . . . .  18
     11.2.  Informative References . . . . . . . . . . . . . . . . .  19
   Appendix A.  A Deployment Example with KMS  . . . . . . . . . . .  19
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  21

1.  Introduction

   Many advanced Service Functions (e.g., Performance Enhancement
   Proxies, NATs, firewalls, etc.) are invoked for the delivery of
   value-added services, particularly to meet various service objectives
   such as IP address sharing, avoiding covert channels, detecting
   Denial-of-Service (DoS) attacks and protecting network
   infrastructures against them, network slicing, etc.  Because of the
   proliferation of such advanced SFs together with complex service
   deployment constraints that demand more agile service delivery
   procedures, operators need to rationalize their service delivery
   logics and master their complexity while optimising service
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