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Internet Key Exchange Protocol Version 2 (IKEv2) Session Resumption
RFC 5723

Internet Engineering Task Force (IETF)                        Y. Sheffer
Request for Comments: 5723                                   Check Point
Category: Standards Track                                  H. Tschofenig
ISSN: 2070-1721                                   Nokia Siemens Networks
                                                            January 2010

           Internet Key Exchange Protocol Version 2 (IKEv2)
                           Session Resumption

Abstract

   The Internet Key Exchange version 2 (IKEv2) protocol has a certain
   computational and communication overhead with respect to the number
   of round trips required and the cryptographic operations involved.
   In remote access situations, the Extensible Authentication Protocol
   (EAP) is used for authentication, which adds several more round trips
   and consequently latency.

   To re-establish security associations (SAs) upon a failure recovery
   condition is time consuming especially when an IPsec peer (such as a
   VPN gateway) needs to re-establish a large number of SAs with various
   endpoints.  A high number of concurrent sessions might cause
   additional problems for an IPsec peer during SA re-establishment.

   In order to avoid the need to re-run the key exchange protocol from
   scratch, it would be useful to provide an efficient way to resume an
   IKE/IPsec session.  This document proposes an extension to IKEv2 that
   allows a client to re-establish an IKE SA with a gateway in a highly
   efficient manner, utilizing a previously established IKE SA.

   A client can reconnect to a gateway from which it was disconnected.
   The proposed approach encodes partial IKE state into an opaque
   ticket, which can be stored on the client or in a centralized store,
   and is later made available to the IKEv2 responder for re-
   authentication.  We use the term ticket to refer to the opaque data
   that is created by the IKEv2 responder.  This document does not
   specify the format of the ticket but examples are provided.

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.

Sheffer & Tschofenig        Standards Track                     [Page 1]
RFC 5723                IKEv2 Session Resumption            January 2010

   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/rfc5723.

Copyright Notice

   Copyright (c) 2010 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.

   This document may contain material from IETF Documents or IETF
   Contributions published or made publicly available before November
   10, 2008.  The person(s) controlling the copyright in some of this
   material may not have granted the IETF Trust the right to allow
   modifications of such material outside the IETF Standards Process.
   Without obtaining an adequate license from the person(s) controlling
   the copyright in such materials, this document may not be modified
   outside the IETF Standards Process, and derivative works of it may
   not be created outside the IETF Standards Process, except to format
   it for publication as an RFC or to translate it into languages other
   than English.

Sheffer & Tschofenig        Standards Track                     [Page 2]
RFC 5723                IKEv2 Session Resumption            January 2010

Table of Contents

   1. Introduction ....................................................4
   2. Terminology .....................................................5
   3. Usage Scenario ..................................................5
   4. Protocol Sequences ..............................................7
      4.1. Requesting a Ticket ........................................7
      4.2. Receiving a Ticket .........................................8

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