Integrity Protection for the Network Service Header (NSH) and Encryption of Sensitive Context Headers
draft-ietf-sfc-nsh-integrity-00

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Last updated 2020-06-19
Replaces draft-rebo-sfc-nsh-integrity
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SFC                                                         M. Boucadair
Internet-Draft                                                    Orange
Intended status: Standards Track                                T. Reddy
Expires: December 20, 2020                                        McAfee
                                                                 D. Wing
                                                                  Citrix
                                                           June 18, 2020

Integrity Protection for the Network Service Header (NSH) and Encryption
                      of Sensitive Context Headers
                    draft-ietf-sfc-nsh-integrity-00

Abstract

   This specification adds integrity protection and optional encryption
   of sensitive metadata directly to the Network Service Header (NSH)
   used for Service Function Chaining (SFC).

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   This Internet-Draft will expire on December 20, 2020.

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   Copyright (c) 2020 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
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Boucadair, et al.       Expires December 20, 2020               [Page 1]
Internet-Draft      Integrity Protection for the NSH           June 2020

   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   4
   3.  Assumptions and Basic Requirements  . . . . . . . . . . . . .   4
   4.  Design Overview . . . . . . . . . . . . . . . . . . . . . . .   6
     4.1.  Supported Security Services . . . . . . . . . . . . . . .   6
       4.1.1.  Encrypt All or a Subset of Context Headers  . . . . .   6
       4.1.2.  Integrity Protection  . . . . . . . . . . . . . . . .   7
     4.2.  One Secret Key, Two Security Services . . . . . . . . . .   9
     4.3.  Mandatory-to-Implement Authenticated Encryption and HMAC
           Algorithms  . . . . . . . . . . . . . . . . . . . . . . .  10
     4.4.  Key Management  . . . . . . . . . . . . . . . . . . . . .  10
     4.5.  New NSH Variable-Length Context Headers . . . . . . . . .  11
     4.6.  Encapsulation of NSH within NSH . . . . . . . . . . . . .  11
   5.  New NSH Variable-Length Context Headers . . . . . . . . . . .  12
     5.1.  MAC#1 Context Header  . . . . . . . . . . . . . . . . . .  13
     5.2.  MAC#2 Context Header  . . . . . . . . . . . . . . . . . .  15
   6.  Timestamp Format  . . . . . . . . . . . . . . . . . . . . . .  17
   7.  Processing Rules  . . . . . . . . . . . . . . . . . . . . . .  18
     7.1.  Generic Behavior  . . . . . . . . . . . . . . . . . . . .  18
     7.2.  MAC NSH Data Generation . . . . . . . . . . . . . . . . .  19
     7.3.  Encrypted NSH Metadata Generation . . . . . . . . . . . .  20
     7.4.  Timestamp for Replay Attack . . . . . . . . . . . . . . .  21
     7.5.  NSH Data Validation . . . . . . . . . . . . . . . . . . .  22
     7.6.  Decryption of NSH Metadata  . . . . . . . . . . . . . . .  22
   8.  Security Considerations . . . . . . . . . . . . . . . . . . .  22
     8.1.  MAC#1 . . . . . . . . . . . . . . . . . . . . . . . . . .  23
     8.2.  MAC#2 . . . . . . . . . . . . . . . . . . . . . . . . . .  24
   9.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  24
   10. Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  24
   11. References  . . . . . . . . . . . . . . . . . . . . . . . . .  24
     11.1.  Normative References . . . . . . . . . . . . . . . . . .  24
     11.2.  Informative References . . . . . . . . . . . . . . . . .  25
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  26

1.  Introduction

   Many advanced Service Functions (SFs) are invoked for the delivery of
   value-added services.  Typically, SFs are used to meet various
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