Integrity Protection for the Network Service Header (NSH) and Encryption of Sensitive Context Headers
draft-ietf-sfc-nsh-integrity-03

Document Type Active Internet-Draft (sfc WG)
Authors Mohamed Boucadair  , Tirumaleswar Reddy.K  , Dan Wing 
Last updated 2021-01-22
Replaces draft-rebo-sfc-nsh-integrity
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SFC                                                         M. Boucadair
Internet-Draft                                                    Orange
Intended status: Standards Track                                T. Reddy
Expires: July 26, 2021                                            McAfee
                                                                 D. Wing
                                                                  Citrix
                                                        January 22, 2021

Integrity Protection for the Network Service Header (NSH) and Encryption
                      of Sensitive Context Headers
                    draft-ietf-sfc-nsh-integrity-03

Abstract

   This specification adds integrity protection directly to the Network
   Service Header (NSH) used for Service Function Chaining (SFC).  Also,
   this specification allows to encrypt sensitive metadata that is
   carried in the NSH.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

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   This Internet-Draft will expire on July 26, 2021.

Copyright Notice

   Copyright (c) 2021 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
   Provisions Relating to IETF Documents
   (https://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must

Boucadair, et al.         Expires July 26, 2021                 [Page 1]
Internet-Draft      Integrity Protection for the NSH        January 2021

   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
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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  . . . . .   7
       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  . . . . . . . . . . . . . . .  23
   8.  MTU Considerations  . . . . . . . . . . . . . . . . . . . . .  23
   9.  Security Considerations . . . . . . . . . . . . . . . . . . .  23
     9.1.  MAC#1 . . . . . . . . . . . . . . . . . . . . . . . . . .  25
     9.2.  MAC#2 . . . . . . . . . . . . . . . . . . . . . . . . . .  25
     9.3.  Time Synchronization  . . . . . . . . . . . . . . . . . .  26
   10. IANA Considerations . . . . . . . . . . . . . . . . . . . . .  26
   11. Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  26
   12. References  . . . . . . . . . . . . . . . . . . . . . . . . .  26
     12.1.  Normative References . . . . . . . . . . . . . . . . . .  26
     12.2.  Informative References . . . . . . . . . . . . . . . . .  27
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