Signature Authentication in IKEv2
draft-kivinen-ipsecme-signature-auth-00

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IP Security Maintenance and Extensions                        T. Kivinen
(ipsecme)                                                  INSIDE Secure
Internet-Draft                                          December 4, 2012
Updates: RFC 5996 (if approved)
Intended status: Standards Track
Expires: June 7, 2013

                   Signature Authentication in IKEv2
              draft-kivinen-ipsecme-signature-auth-00.txt

Abstract

   The Internet Key Exchange Version 2 (IKEv2) protocol has limited
   support for the Elliptic Curve Digital Signature Algorithm (ECDSA).
   The current support only includes support for three Elliptic Curve
   groups, and there is fixed hash algorithm tied to each curve.  This
   document generalizes the IKEv2 signature support so it can support
   any signature method supported by the PKIX and also adds signature
   hash algorithm negotiation.  This generic mechanism is not limited to
   ECDSA, but can also be used with other signature algorithms.

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 June 7, 2013.

Copyright Notice

   Copyright (c) 2012 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

Kivinen                   Expires June 7, 2013                  [Page 1]
Internet-Draft      Signature Authentication in IKEv2      December 2012

   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
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . . . 4
   3.  Authentication Payload  . . . . . . . . . . . . . . . . . . . . 4
   4.  Hash Algorithm Notification . . . . . . . . . . . . . . . . . . 6
   5.  Security Considerations . . . . . . . . . . . . . . . . . . . . 7
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 7
   7.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . . . 8
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . . . 8
     8.1.  Normative References  . . . . . . . . . . . . . . . . . . . 8
     8.2.  Informative References  . . . . . . . . . . . . . . . . . . 8
   Appendix A.  Examples . . . . . . . . . . . . . . . . . . . . . . . 8
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . . . 8

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Internet-Draft      Signature Authentication in IKEv2      December 2012

1.  Introduction

   This document adds support for new IKEv2 ([RFC5996]) authentication
   method to support all kinds of signature methods.  The current
   signature based authentication methods in the IKEv2 are per
   algorithm, i.e. there is one for RSA Digital signatures, one for DSS
   Digital Signatures (using SHA-1) and three for different ECDSA curves
   each tied to exactly one hash algorithm.  This design starts to be
   cumbersome when more ECDSA groups are added, as each of them would
   require new authentication method and as with ECDSA there is no way
   to extract the hash algorithm from the signature, each ECDSA
   algorithm would need to come with fixed hash algorithm tied to it.

   With the SHA-3 definitions coming out, it is seen that it might be
   possible that in the future the signature methods are used with SHA-3
   also, not only SHA-2.  This means new mechanism for negotiating the
   hash algorithm for the signature algorithms is needed.

   The RSA Digital Signatures format in the IKEv2 is specified to use
   RSASSA-PKCS1-v1_5, but there has been some discussions that newer
   padding methods should also be possible (See section 5 of [RFC4055]).
   The DSS Digital Signatures format in the IKEv2 is specified to always
   use SHA-1, which limits the security of that, meaning there is no
   point of using long keys with it.