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Applicability of Keying Methods for RSVP Security
RFC 6411

Internet Engineering Task Force (IETF)                      M. Behringer
Request for Comments: 6411                                F. Le Faucheur
Category: Informational                                          B. Weis
ISSN: 2070-1721                                            Cisco Systems
                                                            October 2011

           Applicability of Keying Methods for RSVP Security

Abstract

   The Resource reSerVation Protocol (RSVP) allows hop-by-hop integrity
   protection of RSVP neighbors.  This requires messages to be
   cryptographically protected using a shared secret between
   participating nodes.  This document compares group keying for RSVP
   with per-neighbor or per-interface keying, and discusses the
   associated key provisioning methods as well as applicability and
   limitations of these approaches.  This document also discusses
   applicability of encrypting RSVP messages.

Status of This Memo

   This document is not an Internet Standards Track specification; it is
   published for informational purposes.

   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 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/rfc6411.

Behringer, et al.             Informational                     [Page 1]
RFC 6411                RSVP Keying Applicability           October 2011

Copyright Notice

   Copyright (c) 2011 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 and Problem Statement . . . . . . . . . . . . . .  3
     1.1.  Terminology  . . . . . . . . . . . . . . . . . . . . . . .  3
   2.  The RSVP Hop-by-Hop Trust Model  . . . . . . . . . . . . . . .  4
   3.  Applicability of Key Types for RSVP  . . . . . . . . . . . . .  5
     3.1.  Per-Interface and Per-Neighbor Keys  . . . . . . . . . . .  5
     3.2.  Group Keys . . . . . . . . . . . . . . . . . . . . . . . .  6
   4.  Key Provisioning Methods for RSVP  . . . . . . . . . . . . . .  8
     4.1.  Static Key Provisioning  . . . . . . . . . . . . . . . . .  8
     4.2.  Dynamic Keying . . . . . . . . . . . . . . . . . . . . . .  8
       4.2.1.  Per-Neighbor and Per-Interface Key Negotiation . . . .  8
       4.2.2.  Dynamic Group Key Distribution . . . . . . . . . . . .  8
   5.  Specific Cases Supporting Use of Group Keying  . . . . . . . .  9
     5.1.  RSVP Notify Messages . . . . . . . . . . . . . . . . . . .  9
     5.2.  RSVP-TE and GMPLS  . . . . . . . . . . . . . . . . . . . .  9
   6.  Applicability of IPsec for RSVP  . . . . . . . . . . . . . . . 10
     6.1.  General Considerations Using IPsec . . . . . . . . . . . . 10
     6.2.  Comparing AH and the INTEGRITY Object  . . . . . . . . . . 11
     6.3.  Applicability of Tunnel Mode . . . . . . . . . . . . . . . 11
     6.4.  Non-Applicability of Transport Mode  . . . . . . . . . . . 12
     6.5.  Applicability of Tunnel Mode with Address Preservation . . 12
   7.  End-Host Considerations  . . . . . . . . . . . . . . . . . . . 13
   8.  Applicability to Other Architectures and Protocols . . . . . . 14
   9.  Summary  . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
   10. Security Considerations  . . . . . . . . . . . . . . . . . . . 16
     10.1. Subverted Nodes  . . . . . . . . . . . . . . . . . . . . . 16
   11. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 16
   12. Informative References . . . . . . . . . . . . . . . . . . . . 16

Behringer, et al.             Informational                     [Page 2]
RFC 6411                RSVP Keying Applicability           October 2011

1.  Introduction and Problem Statement

   The Resource reSerVation Protocol [RFC2205] allows hop-by-hop
   authentication of RSVP neighbors, as specified in [RFC2747].  In this

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