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Password Authenticated Connection Establishment with the Internet Key Exchange Protocol version 2 (IKEv2)
RFC 6631

Internet Engineering Task Force (IETF)                        D. Kuegler
Request for Comments: 6631                                           BSI
Category: Experimental                                        Y. Sheffer
ISSN: 2070-1721                                                 Porticor
                                                               June 2012

            Password Authenticated Connection Establishment
       with the Internet Key Exchange Protocol version 2 (IKEv2)

Abstract

   The Internet Key Exchange protocol version 2 (IKEv2) does not allow
   secure peer authentication when using short credential strings, i.e.,
   passwords.  Several proposals have been made to integrate password-
   authentication protocols into IKE.  This document provides an
   adaptation of Password Authenticated Connection Establishment (PACE)
   to the setting of IKEv2 and demonstrates the advantages of this
   integration.

Status of This Memo

   This document is not an Internet Standards Track specification; it is
   published for examination, experimental implementation, and
   evaluation.

   This document defines an Experimental Protocol for the Internet
   community.  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/rfc6631.

Kuegler & Sheffer             Experimental                      [Page 1]
RFC 6631                     IKEv2 with PACE                   June 2012

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
   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. Terminology ................................................4
   2. Overview ........................................................5
   3. Protocol Sequence ...............................................6
      3.1. The IKE_SA_INIT Exchange ...................................6
      3.2. The IKE_AUTH Exchange, Round #1 ............................7
      3.3. The IKE_AUTH Exchange, Round #2 ............................7
      3.4. Public Key Validation ......................................8
      3.5. Creating a Long-Term Shared Secret .........................9
      3.6. Using the Long-Term Shared Secret .........................11
   4. Encrypting and Mapping the Nonce ...............................11
      4.1. Encrypting the Nonce ......................................11
      4.2. Mapping the Nonce .........................................12
           4.2.1. Modular Diffie-Hellman .............................13
           4.2.2. Elliptic Curve Diffie-Hellman ......................13
   5. Protocol Details ...............................................13
      5.1. Password Processing .......................................13
      5.2. The SECURE_PASSWORD_METHODS Notification ..................14
      5.3. The PSK_PERSIST Notification ..............................15
      5.4. The PSK_CONFIRM Notification ..............................15
      5.5. The GSPM(ENONCE) Payload ..................................15
      5.6. The KE (KEi2/KEr2) Payloads in PACE .......................16
      5.7. PACE and Session Resumption ...............................16
   6. Security Considerations ........................................16
      6.1. Credential Security Assumptions ...........................16
      6.2. Vulnerability to Passive and Active Attacks ...............16
      6.3. Perfect Forward Secrecy ...................................17
      6.4. Randomness ................................................17
      6.5. Identity Protection .......................................17
      6.6. Denial of Service .........................................17

Kuegler & Sheffer             Experimental                      [Page 2]

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