Security Considerations for SRv6 Networks
draft-li-spring-srv6-security-consideration-03

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Spring                                                             C. Li
Internet-Draft                                                     Z. Li
Intended status: Informational                                    Huawei
Expires: May 7, 2020                                              C. Xie
                                                           China Telecom
                                                                 H. Tian
                                                                   CAICT
                                                                  J. Mao
                                                                  Huawei
                                                        November 4, 2019

               Security Considerations for SRv6 Networks
             draft-li-spring-srv6-security-consideration-03

Abstract

   SRv6 inherits potential security vulnerabilities from Source Routing
   in general, and also from IPv6.  This document describes various
   threats and security concerns related to SRv6 networks and existing
   approaches to solve these threats.

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   This Internet-Draft will expire on May 7, 2020.

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   Copyright (c) 2019 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

Li, et al.                 Expires May 7, 2020                  [Page 1]
Internet-Draft                 SR-security                 November 2019

   carefully, as they describe your rights and restrictions with respect
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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Security Principles of SRv6 Networking  . . . . . . . . . . .   4
   4.  Types of Vulnerabilities in SR Networks . . . . . . . . . . .   4
     4.1.  Eavesdropping Vulnerabilities in SRv6 Networks  . . . . .   4
     4.2.  Packet Falsification in SRv6 Networks . . . . . . . . . .   5
     4.3.  Identity Spoofing in SRv6 Networks  . . . . . . . . . . .   6
     4.4.  Packet Replay in SRv6 Networks  . . . . . . . . . . . . .   7
     4.5.  DOS/DDOS in SRv6 Networks . . . . . . . . . . . . . . . .   7
     4.6.  Malicious Packet Data in SRv6 Networks  . . . . . . . . .   8
   5.  Effects of the above on SRv6 Use Cases  . . . . . . . . . . .   8
   6.  Security Policy Design  . . . . . . . . . . . . . . . . . . .   8
     6.1.  Basic Security Design . . . . . . . . . . . . . . . . . .   9
       6.1.1.  ACL for External Interfaces . . . . . . . . . . . . .   9
       6.1.2.  ACL for Internal Interfaces . . . . . . . . . . . . .   9
       6.1.3.  SID Instantiation . . . . . . . . . . . . . . . . . .   9
     6.2.  Enhanced Security Design  . . . . . . . . . . . . . . . .  10
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .  10
   8.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  10
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  10
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .  10
     9.2.  Informative References  . . . . . . . . . . . . . . . . .  11
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  12

1.  Introduction

   Segment Routing (SR) [RFC8402] is a source routing paradigm that
   explicitly indicates the forwarding path for packets at the source
   node by inserting an ordered list of instructions, called segments.
   A segment can represent a topological or service-based instruction.

   When segment routing is deployed on IPv6 [RFC8200] dataplane, called
   SRv6 [I-D.ietf-6man-segment-routing-header], a segment is a 128 bit
   value, and can the IPv6 address of a local interface but it does not
   have to.  For supporting SR, a new type of Routing Extension Header
   is defined and called the Segment Routing Header (SRH).  The SRH
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