Impact of TLS 1.3 to Operational Network Security Practices
draft-camwinget-tls-ns-impact-00

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OPSEC Working Group                                        N. Cam-Winget
Internet-Draft                                                   E. Wang
Intended status: Informational                       Cisco Systems, Inc.
Expires: September 4, 2020                                    R. Danyliw
                                          Software Engineering Institute
                                                               R. DuToit
                                                                Broadcom
                                                          March 03, 2020

      Impact of TLS 1.3 to Operational Network Security Practices
                    draft-camwinget-tls-ns-impact-00

Abstract

   Network-based security solutions are used by enterprises, the public
   sector, internet-service providers, and cloud-service providers to
   both complement and enhance host-based security solutions.  As TLS is
   a widely deployed protocol to secure communication, these network-
   based security solutions must necessarily interact with it.  This
   document describes this interaction for current operational security
   practices and notes the impact of TLS 1.3 on them.

Status of This Memo

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   This Internet-Draft will expire on September 4, 2020.

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   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

Cam-Winget, et al.      Expires September 4, 2020               [Page 1]
Internet-Draft                tls-ns-impact                   March 2020

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Conventions and Definitions . . . . . . . . . . . . . . . . .   3
   3.  How TLS is used to enable Network-Based Security Solutions  .   4
     3.1.  Passive TLS Inspection  . . . . . . . . . . . . . . . . .   5
       3.1.1.  OP-1. Acceptable Use Policy (AUP) Enforcement (via
               header inspection). . . . . . . . . . . . . . . . . .   5
       3.1.2.  OP-2. Network Behavior Analytics  . . . . . . . . . .   6
       3.1.3.  OP-3. Crypto, Security  and Security Policy
               Compliance (server) . . . . . . . . . . . . . . . . .   7
       3.1.4.  OP-4. Crypto and Security Policy Compliance (client)    7
     3.2.  Outbound TLS Proxy  . . . . . . . . . . . . . . . . . . .   7
       3.2.1.  OP-5: Acceptable Use Policy (AUP) Enforcement (via
               payload inspection) . . . . . . . . . . . . . . . . .   8
       3.2.2.  OP-6: Data Loss Prevention Compliance . . . . . . . .   9
       3.2.3.  OP-7: Granular Network Segmentation . . . . . . . . .   9
       3.2.4.  OP-8: Network-based Threat Protection (client)  . . .   9
       3.2.5.  OP-9: Protecting Challenging End Points . . . . . . .  10
       3.2.6.  OP-10: Content Injection  . . . . . . . . . . . . . .  10
     3.3.  Inbound TLS Proxy . . . . . . . . . . . . . . . . . . . .  10
       3.3.1.  OP-11: TLS offloading . . . . . . . . . . . . . . . .  11
       3.3.2.  OP-12. Content distribution and application load
               balancing . . . . . . . . . . . . . . . . . . . . . .  11
       3.3.3.  OP-13: Network-based Threat Protection (server) . . .  12
       3.3.4.  OP-14: Full Packet Capture  . . . . . . . . . . . . .  12
       3.3.5.  OP-15: Application Layer Gateway (ALG)  . . . . . . .  13
   4.  Changes in TLS v1.3 Relevant to Security Operations . . . . .  13
     4.1.  Perfect Forward Secrecy (PFS) . . . . . . . . . . . . . .  13
     4.2.  Encrypted Server Certificate  . . . . . . . . . . . . . .  13
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .  14
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  14
   7.  Appendix A: Summary Impact to Operational Practices with TLS