Security Considerations for SRv6 Networks
draft-li-spring-srv6-security-consideration-01

• Status
• IESG evaluation record
• IESG writeups
• Email expansions
• History

• Versions
• 00
• 01

Spring                                                             C. Li
Internet-Draft                                                     Z. Li
Intended status: Informational                                    Huawei
Expires: January 9, 2020                                    July 8, 2019

               Security Considerations for SRv6 Networks
             draft-li-spring-srv6-security-consideration-01

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.

Status of This Memo

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

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF).  Note that other groups may also distribute
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at https://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on January 9, 2020.

Copyright Notice

   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
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Li & Li                  Expires January 9, 2020                [Page 1]
Internet-Draft                 SR-security                     July 2019

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Security Principles of SRv6 Networking  . . . . . . . . . . .   3
   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  . . . . . . . . . . . . . . . .   9
   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
   contains a list of SIDs and other information such as Segments Left.
   The SRH is defined in [I-D.ietf-6man-segment-routing-header].  By
   using the SRH, an ingress router can steer SRv6 packets into an
   explicit forwarding path so that many use cases like Traffic
   Engineering, Service Function Chaining can be deployed easily by
   SRv6.

   However, SRv6 also brings some new security concerns.  This document