Supporting Authentication Trailer for OSPFv3
RFC 7166

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Internet Engineering Task Force (IETF)                         M. Bhatia
Request for Comments: 7166                                Alcatel-Lucent
Obsoletes: 6506                                                V. Manral
Category: Standards Track                                    Ionos Corp.
ISSN: 2070-1721                                                A. Lindem
                                                                Ericsson
                                                              March 2014

              Supporting Authentication Trailer for OSPFv3

Abstract

   Currently, OSPF for IPv6 (OSPFv3) uses IPsec as the only mechanism
   for authenticating protocol packets.  This behavior is different from
   authentication mechanisms present in other routing protocols (OSPFv2,
   Intermediate System to Intermediate System (IS-IS), RIP, and Routing
   Information Protocol Next Generation (RIPng)).  In some environments,
   it has been found that IPsec is difficult to configure and maintain
   and thus cannot be used.  This document defines an alternative
   mechanism to authenticate OSPFv3 protocol packets so that OSPFv3 does
   not depend only upon IPsec for authentication.

   The OSPFv3 Authentication Trailer was originally defined in RFC 6506.
   This document obsoletes RFC 6506 by providing a revised definition,
   including clarifications and refinements of the procedures.

Status of This Memo

   This is an Internet Standards Track document.

   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).  Further information on
   Internet Standards is available in Section 2 of RFC 5741.

   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/rfc7166.

Bhatia, et al.               Standards Track                    [Page 1]
RFC 7166            Authentication Trailer for OSPFv3         March 2014

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
   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
      1.1. Requirements ...............................................4
      1.2. Summary of Changes from RFC 6506 ...........................4
   2. Proposed Solution ...............................................5
      2.1. AT-Bit in Options Field ....................................5
      2.2. Basic Operation ............................................6
      2.3. IPv6 Source Address Protection .............................6
   3. OSPFv3 Security Association .....................................7
   4. Authentication Procedure ........................................9
      4.1. Authentication Trailer .....................................9
           4.1.1. Sequence Number Wrap ...............................11
      4.2. OSPFv3 Header Checksum and LLS Data Block Checksum ........11
      4.3. Cryptographic Authentication Procedure ....................12
      4.4. Cross-Protocol Attack Mitigation ..........................12
      4.5. Cryptographic Aspects .....................................12
      4.6. Message Verification ......................................15
   5. Migration and Backward Compatibility ...........................16
   6. Security Considerations ........................................17
   7. IANA Considerations ............................................18
   8. References .....................................................19
      8.1. Normative References ......................................19
      8.2. Informative References ....................................19
   Appendix A. Acknowledgments .......................................22

Bhatia, et al.               Standards Track                    [Page 2]
RFC 7166            Authentication Trailer for OSPFv3         March 2014

1.  Introduction

   Unlike Open Shortest Path First version 2 (OSPFv2) [RFC2328], OSPF
   for IPv6 (OSPFv3) [RFC5340] does not include the AuType and
   Authentication fields in its headers for authenticating protocol
   packets.  Instead, OSPFv3 relies on the IPsec protocols
   Authentication Header (AH) [RFC4302] and Encapsulating Security