Opportunistic Security in MPLS Networks
draft-farrelll-mpls-opportunistic-encrypt-03

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Network Working Group                                          A. Farrel
Internet-Draft                                          Juniper Networks
Intended status: Experimental
Expires: April 26, 2015                                       S. Farrell
                                                 Trinity College, Dublin
                                                        October 26, 2014

              Opportunistic Security in MPLS Networks

          draft-farrelll-mpls-opportunistic-encrypt-03.txt

Abstract

   This document describes a way to apply opportunistic security
   between adjacent nodes on an MPLS Label Switched Path (LSP) or
   between end points of an LSP.  It explains how keys may be agreed
   to enable encryption, and how key identifiers are exchanged in
   encrypted MPLS packets.  Finally, this document describes the
   applicability of this approach to opportunistic security in MPLS
   networks with an indication of the level of improved security as
   well as the continued vulnerabilities.

   This document does not describe security for MPLS control plane
   protocols.

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
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Copyright Notice

   Copyright (c) 2014 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
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents

Farrel and Farrell                                              [Page 1]
Internet-Draft        Opportunistic MPLS Security           October 2014

   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.

Notation

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in RFC 2119 [RFC2119].

Table of Contents

   1. Introduction ................................................... 3
   1.1. Experimental Status .......................................... 4
   2. Principles of Opportunistic Security ........................... 5
   2.1. Why Do We Need Opportunistic Security? ....................... 5
   2.2. Opportunistic Security at 10,000ft ........................... 6
   2.3. What about a Man-in-the-Middle? .............................. 8
   2.4. OS in MPLS Overview .......................................... 9
   3. MPLS Packet Encryption ........................................ 11
   3.1. MPLS Encryption Label ....................................... 13
   3.2. Control Word ................................................ 14
   3.3. Considerations for ECMP ..................................... 15
   3.4. Backward Compatibility ...................................... 16
   3.5. MTU Considerations .......................................... 17
   3.6. Recursive Encryption ........................................ 17
   4. Key Exchange For Opportunistic Security in MPLS ............... 17
   4.1. MPLS G-ACh Advertisement Protocol for Key Exchange .......... 18
   4.2. Key Exchange Protocol ....................................... 18
   4.3. Indicating the Return Path .................................. 23
   4.4. Protecting the Key Exchange Protocol Messages ............... 24
   5. Applicability of MPLS Opportunistic Security  ................. 24
   6. Security Considerations ....................................... 26
   6.1. Security Improvements ....................................... 26
   6.2. Continued Vulnerabilities ................................... 26
   6.3. New Security Considerations ................................. 26
   7. Manageability Considerations .................................. 27
   7.1. MITM Detection .............................................. 27
   8.  IANA Considerations .......................................... 27
   8.1. GAP Key Exchange TLV ........................................ 27
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