Locator/ID Separation Protocol (LISP) Data-Plane Confidentiality
RFC 8061

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Internet Engineering Task Force (IETF)                      D. Farinacci
Request for Comments: 8061                                   lispers.net
Category: Experimental                                           B. Weis
ISSN: 2070-1721                                            Cisco Systems
                                                           February 2017

    Locator/ID Separation Protocol (LISP) Data-Plane Confidentiality

Abstract

   This document describes a mechanism for encrypting traffic
   encapsulated using the Locator/ID Separation Protocol (LISP).  The
   design describes how key exchange is achieved using existing LISP
   control-plane mechanisms as well as how to secure the LISP data plane
   from third-party surveillance attacks.

Status of This Memo

   This document is not an Internet Standards Track specification; it is
   published for examination, experimental implementation, and
   evaluation.

   This document defines an Experimental Protocol for the Internet
   community.  This document is a product of the Internet Engineering
   Task Force (IETF).  It represents the consensus of the IETF
   community.  It has received public review and has been approved for
   publication by the Internet Engineering Steering Group (IESG).  Not
   all documents approved by the IESG are a candidate for any level of
   Internet Standard; see Section 2 of RFC 7841.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   http://www.rfc-editor.org/info/rfc8061.

Farinacci & Weis              Experimental                      [Page 1]
RFC 8061             LISP Data-Plane Confidentiality       February 2017

Copyright Notice

   Copyright (c) 2017 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
   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.

Table of Contents

   1. Introduction ....................................................3
   2. Requirements Notation ...........................................4
   3. Definition of Terms .............................................4
   4. Overview ........................................................4
   5. Diffie-Hellman Key Exchange .....................................5
   6. Encoding and Transmitting Key Material ..........................6
   7. Shared Keys Used for the Data Plane .............................8
   8. Data-Plane Operation ...........................................10
   9. Procedures for Encryption and Decryption .......................11
   10. Dynamic Rekeying ..............................................12
   11. Future Work ...................................................13
   12. Security Considerations .......................................14
      12.1. SAAG Support .............................................14
      12.2. LISP-Crypto Security Threats .............................14
   13. IANA Considerations ...........................................15
   14. References ....................................................16
      14.1. Normative References .....................................16
      14.2. Informative References ...................................17
   Acknowledgments ...................................................18
   Authors' Addresses ................................................18

Farinacci & Weis              Experimental                      [Page 2]
RFC 8061             LISP Data-Plane Confidentiality       February 2017

1.  Introduction

   This document describes a mechanism for encrypting LISP-encapsulated
   traffic.  The design describes how key exchange is achieved using
   existing LISP control-plane mechanisms as well as how to secure the
   LISP data plane from third-party surveillance attacks.

   The Locator/ID Separation Protocol [RFC6830] defines a set of
   functions for routers to exchange information used to map from
   non-routable Endpoint Identifiers (EIDs) to routable Routing Locators
   (RLOCs).  LISP Ingress Tunnel Routers (ITRs) and Proxy Ingress Tunnel
   Routers (PITRs) encapsulate packets to Egress Tunnel Routers (ETRs)
   and Re-encapsulating Tunnel Routers (RTRs).  Packets that arrive at
   the ITR or PITR may not be encrypted, which means no protection or
   privacy of the data is added.  When the source host encrypts the data
   stream, encapsulated packets do not need to be encrypted by LISP.
   However, when plaintext packets are sent by hosts, this design can