LDP Hello Cryptographic Authentication
draft-ietf-mpls-ldp-hello-crypto-auth-07

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Document Type Active Internet-Draft (mpls WG)
Last updated 2014-05-29
Replaces draft-zheng-mpls-ldp-hello-crypto-auth
Stream IETF
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IANA IANA review state Version Changed - Review Needed
Network Working Group                                           L. Zheng
Internet-Draft                                                   M. Chen
Intended status: Standards Track                     Huawei Technologies
Expires: November 30, 2014                                     M. Bhatia
                                                          Alcatel-Lucent
                                                            May 29, 2014

                 LDP Hello Cryptographic Authentication
              draft-ietf-mpls-ldp-hello-crypto-auth-07.txt

Abstract

   This document introduces a new optional Cryptographic Authentication
   TLV that LDP can use to secure its Hello messages.  It secures the
   Hello messages against spoofing attacks and some well known attacks
   against the IP header.  This document describes a mechanism to secure
   the LDP Hello messages using National Institute of Standards and
   Technology (NIST) Secure Hash Standard family of algorithms.

Requirements Language

   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].

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
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   This Internet-Draft will expire on November 30, 2014.

Copyright Notice

   Copyright (c) 2014 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Zheng, et al.           Expires November 30, 2014               [Page 1]
Internet-Draft   LDP Hello Cryptographic Authentication         May 2014

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Cryptographic Authentication TLV  . . . . . . . . . . . . . .   4
     2.1.  Optional Parameter for Hello Message  . . . . . . . . . .   4
     2.2.  LDP Security Association  . . . . . . . . . . . . . . . .   4
     2.3.  Cryptographic Authentication TLV Encoding . . . . . . . .   6
     2.4.  Sequence Number Wrap  . . . . . . . . . . . . . . . . . .   8
   3.  Cryptographic Authentication Procedure  . . . . . . . . . . .   8
   4.  Cross Protocol Attack Mitigation  . . . . . . . . . . . . . .   8
   5.  Cryptographic Aspects . . . . . . . . . . . . . . . . . . . .   8
     5.1.  Preparing the Cryptographic Key . . . . . . . . . . . . .   9
     5.2.  Computing the Hash  . . . . . . . . . . . . . . . . . . .   9
     5.3.  Result  . . . . . . . . . . . . . . . . . . . . . . . . .  10
   6.  Processing Hello Message Using Cryptographic Authentication .  10
     6.1.  Transmission Using Cryptographic Authentication . . . . .  10
     6.2.  Receipt Using Cryptographic Authentication  . . . . . . .  10
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .  11
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  12
   9.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  12
   10. References  . . . . . . . . . . . . . . . . . . . . . . . . .  12
     10.1.  Normative References . . . . . . . . . . . . . . . . . .  12
     10.2.  Informative References . . . . . . . . . . . . . . . . .  13
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  13

1.  Introduction

   The Label Distribution Protocol (LDP) [RFC5036] sets up LDP sessions
   that run between LDP peers.  The peers could either be directly
   connected at the link level or could be multiple hops away.  An LDP
   Label Switching Router (LSR) could either be configured with the
   identity of its peers or could discover them using LDP Hello
   messages.  These messages are sent encapsulated in UDP addressed to
   "all routers on this subnet" or to a specific IP address.  Periodic
   Hello messages are also used to maintain the relationship between LDP
   peers necessary to keep the LDP session active.
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