The NULL Authentication Method in the Internet Key Exchange Protocol Version 2 (IKEv2)
RFC 7619

Document Type RFC - Proposed Standard (August 2015; No errata)
Updates RFC 4301
Last updated 2015-10-14
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Internet Engineering Task Force (IETF)                        V. Smyslov
Request for Comments: 7619                                    ELVIS-PLUS
Updates: 4301                                                 P. Wouters
Category: Standards Track                                        Red Hat
ISSN: 2070-1721                                              August 2015

                     The NULL Authentication Method
        in the Internet Key Exchange Protocol Version 2 (IKEv2)

Abstract

   This document specifies the NULL Authentication method and the
   ID_NULL Identification Payload ID Type for Internet Key Exchange
   Protocol version 2 (IKEv2).  This allows two IKE peers to establish
   single-side authenticated or mutual unauthenticated IKE sessions for
   those use cases where a peer is unwilling or unable to authenticate
   or identify itself.  This ensures IKEv2 can be used for Opportunistic
   Security (also known as Opportunistic Encryption) to defend against
   Pervasive Monitoring attacks without the need to sacrifice anonymity.

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/rfc7619.

Smyslov & Wouters            Standards Track                    [Page 1]
RFC 7619                   NULL Auth in IKEv2                August 2015

Copyright Notice

   Copyright (c) 2015 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.  Conventions Used in This Document . . . . . . . . . . . .   4
   2.  Using the NULL Authentication Method  . . . . . . . . . . . .   4
     2.1.  Authentication Payload  . . . . . . . . . . . . . . . . .   4
     2.2.  Identification Payload  . . . . . . . . . . . . . . . . .   4
     2.3.  INITIAL_CONTACT Notification  . . . . . . . . . . . . . .   5
     2.4.  Interaction with the Peer Authorization Database (PAD)  .   5
     2.5.  Traffic Selectors . . . . . . . . . . . . . . . . . . . .   6
   3.  Security Considerations . . . . . . . . . . . . . . . . . . .   7
     3.1.  Audit Trail and Peer Identification . . . . . . . . . . .   7
     3.2.  Resource Management and Robustness  . . . . . . . . . . .   8
     3.3.  IKE Configuration Selection . . . . . . . . . . . . . . .   8
     3.4.  Networking Topology Changes . . . . . . . . . . . . . . .   8
   4.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   9
   5.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   9
     5.1.  Normative References  . . . . . . . . . . . . . . . . . .   9
     5.2.  Informative References  . . . . . . . . . . . . . . . . .   9
   Appendix A.  Update of PAD processing in RFC 4301 . . . . . . . .  11
   Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . .  12
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  12

Smyslov & Wouters            Standards Track                    [Page 2]
RFC 7619                   NULL Auth in IKEv2                August 2015

1.  Introduction

   Internet Key Exchange Protocol version 2 (IKEv2), specified in
   [RFC7296], provides a way for two parties to perform an authenticated
   key exchange.  While the authentication methods used by the peers can
   be different, there is no method for one or both parties to remain
   unauthenticated and anonymous.  This document extends the
   authentication methods to support unauthenticated and anonymous IKE
   sessions.

   In some situations, mutual authentication is undesirable,
   superfluous, or impossible.  The following three examples illustrate
   these unauthenticated use cases:

   o  A user wants to establish an anonymous secure connection to a
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