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

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I2NSF Working Group                                              J. Yang
Internet-Draft                                                  J. Jeong
Intended status: Standards Track                                  J. Kim
Expires: April 25, 2019                          Sungkyunkwan University
                                                        October 22, 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

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   This Internet-Draft will expire on April 25, 2019.

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Yang, et al.             Expires April 25, 2019                 [Page 1]
Internet-Draft      I2NSF Security Policy Translation       October 2018

   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].  It is translated into a low-level policy by
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