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I2NSF Working Group                                              J. Yang
Internet-Draft                                                  J. Jeong
Intended status: Standards Track                                  J. Kim
Expires: January 18, 2019                        Sungkyunkwan University
                                                           July 17, 2018


 Security Policy Translation in Interface to Network Security Functions
            draft-yang-i2nsf-security-policy-translation-02

Abstract

   This document proposes a scheme of security policy translation (i.e.,
   Security Policy Translator) in Interface to Network Security
   Functions (I2NSF) Framework.  When I2NSF User delivers a high-level
   security policy for a security service, Security Policy Translator in
   Security Controller translates it into a low-level security policy
   for Network Security Functions (NSFs).

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 January 18, 2019.

Copyright Notice

   Copyright (c) 2018 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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   (https://trustee.ietf.org/license-info) in effect on the date of
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   include Simplified BSD License text as described in Section 4.e of



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

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Necessity for Policy Translator . . . . . . . . . . . . . . .   3
   4.  Design of Policy Translator . . . . . . . . . . . . . . . . .   4
     4.1.  Overall Structure of Policy Translator  . . . . . . . . .   4
     4.2.  DFA-based Data Extractor  . . . . . . . . . . . . . . . .   6
       4.2.1.  Design of DFA-based Data Extractor  . . . . . . . . .   6
       4.2.2.  Example Scenario for Data Extractor . . . . . . . . .   7
     4.3.  Data Converter  . . . . . . . . . . . . . . . . . . . . .   9
       4.3.1.  Role of Data Converter  . . . . . . . . . . . . . . .   9
       4.3.2.  Data Conversion in Data Converter . . . . . . . . . .  10
       4.3.3.  Policy Provisioning . . . . . . . . . . . . . . . . .  11
     4.4.  CFG-based Policy Generator  . . . . . . . . . . . . . . .  12
       4.4.1.  Content Production  . . . . . . . . . . . . . . . . .  12
       4.4.2.  Structure Production  . . . . . . . . . . . . . . . .  13
       4.4.3.  Generator Construction  . . . . . . . . . . . . . . .  13
   5.  Features of Policy Translator Design  . . . . . . . . . . . .  17
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .  17
   7.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .  18
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  18
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .  18
     8.2.  Informative References  . . . . . . . . . . . . . . . . .  18
   Appendix A.  Changes from draft-yang-i2nsf-security-policy-
                translation-01 . . . . . . . . . . . . . . . . . . .  20
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  20

1.  Introduction

   This document defines a scheme of a security policy translation in
   Interface to Network Security Functions (I2NSF) Framework [RFC8329].
   First of all, this document explains the necessity of a security
   policy translator (shortly called policy translator) in the I2NSF
   framework.

   The policy translator resides in Security Controller in the I2NSF
   framework and translates a high-level security policy to a low-level
   security policy for Network Security Functions (NSFs).  A high-level
   policy is specified by I2NSF User in the I2NSF framework and is
   delivered to Security Controller via Consumer-Facing Interface
   [consumer-facing-inf-dm].  It is translated into a low-level policy
   by Policy Translator in Security Controller and is delivered to NSFs
   to execute the rules corresponding to the low-level policy via NSF-
   Facing Interface [nsf-facing-inf-dm].



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