Port Control Protocol (PCP) Authentication Mechanism
RFC 7652

Document Type RFC - Proposed Standard (September 2015; Errata)
Updates RFC 6887
Last updated 2015-10-29
Replaces draft-wasserman-pcp-authentication
Stream IETF
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Stream WG state Submitted to IESG for Publication
Document shepherd Dave Thaler
Shepherd write-up Show (last changed 2015-05-29)
IESG IESG state RFC 7652 (Proposed Standard)
Consensus Yes
Telechat date
Responsible AD Brian Haberman
Send notices to (None)
IANA IANA review state Version Changed - Review Needed
IANA action state RFC-Ed-Ack
Internet Engineering Task Force (IETF)                         M. Cullen
Request for Comments: 7652                                    S. Hartman
Updates: 6887                                          Painless Security
Category: Standards Track                                       D. Zhang
ISSN: 2070-1721
                                                                T. Reddy
                                                                   Cisco
                                                          September 2015

          Port Control Protocol (PCP) Authentication Mechanism

Abstract

   An IPv4 or IPv6 host can use the Port Control Protocol (PCP) to
   flexibly manage the IP address-mapping and port-mapping information
   on Network Address Translators (NATs) or firewalls to facilitate
   communication with remote hosts.  However, the uncontrolled
   generation or deletion of IP address mappings on such network devices
   may cause security risks and should be avoided.  In some cases, the
   client may need to prove that it is authorized to modify, create, or
   delete PCP mappings.  This document describes an in-band
   authentication mechanism for PCP that can be used in those cases.
   The Extensible Authentication Protocol (EAP) is used to perform
   authentication between PCP devices.

   This document updates RFC 6887.

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/rfc7652.

Cullen, et al.               Standards Track                    [Page 1]
RFC 7652                   PCP Authentication             September 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.

Cullen, et al.               Standards Track                    [Page 2]
RFC 7652                   PCP Authentication             September 2015

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   4
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   5
   3.  Protocol Details  . . . . . . . . . . . . . . . . . . . . . .   6
     3.1.  Session Initiation  . . . . . . . . . . . . . . . . . . .   6
       3.1.1.  Authentication Triggered by the Client  . . . . . . .   6
       3.1.2.  Authentication Triggered by the Server  . . . . . . .   7
       3.1.3.  Authentication Using EAP  . . . . . . . . . . . . . .   8
     3.2.  Recovery from Lost PA Session . . . . . . . . . . . . . .  10
     3.3.  Session Termination . . . . . . . . . . . . . . . . . . .  11
     3.4.  Session Re-authentication . . . . . . . . . . . . . . . .  11
   4.  PA Security Association . . . . . . . . . . . . . . . . . . .  12
   5.  Packet Format . . . . . . . . . . . . . . . . . . . . . . . .  14
     5.1.  Packet Format of PCP Auth Messages  . . . . . . . . . . .  14
     5.2.  Opcode-Specific Information of AUTHENTICATION Opcode  . .  16
     5.3.  NONCE Option  . . . . . . . . . . . . . . . . . . . . . .  16
     5.4.  AUTHENTICATION_TAG Option . . . . . . . . . . . . . . . .  17
     5.5.  PA_AUTHENTICATION_TAG Option  . . . . . . . . . . . . . .  18
     5.6.  EAP_PAYLOAD Option  . . . . . . . . . . . . . . . . . . .  19
     5.7.  PRF Option  . . . . . . . . . . . . . . . . . . . . . . .  19
     5.8.  MAC_ALGORITHM Option  . . . . . . . . . . . . . . . . . .  20
     5.9.  SESSION_LIFETIME Option . . . . . . . . . . . . . . . . .  20
     5.10. RECEIVED_PAK Option . . . . . . . . . . . . . . . . . . .  21
     5.11. ID_INDICATOR Option . . . . . . . . . . . . . . . . . . .  21
   6.  Processing Rules  . . . . . . . . . . . . . . . . . . . . . .  22
     6.1.  Authentication Data Generation  . . . . . . . . . . . . .  22
     6.2.  Authentication Data Validation  . . . . . . . . . . . . .  23
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