Internet DRAFT - draft-ohba-pcp-pana-encap
draft-ohba-pcp-pana-encap
Network Working Group Y. Ohba
Internet-Draft Toshiba
Updates: 5191 (if approved) A. Yegin
Intended status: Standards Track Samsung
Expires: January 04, 2014 S. Das
ACS
July 03, 2013
Provisioning Message Authentication Key for PCP using PANA
(Encapsulation Approach)
draft-ohba-pcp-pana-encap-01
Abstract
This document specifies a mechanism for provisioning PCP (Port
Control Protocol) message authentication key by encapsulating PANA
(Protocol for carrying Authentication for Network Access) in PCP.
Status of This Memo
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
1.1. Specification of Requirements . . . . . . . . . . . . . . 2
2. Establishing a PCP SA . . . . . . . . . . . . . . . . . . . . 3
3. Security Considerations . . . . . . . . . . . . . . . . . . . 4
4. IANA Considerations . . . . . . . . . . . . . . . . . . . . 4
5. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 5
6. Normative References . . . . . . . . . . . . . . . . . . . . 5
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 5
1. Introduction
PCP (Port Control Protocol) [I-D.ietf-pcp-base] is used for an IPv6
or IPv4 host to control how incoming IPv6 or IPv4 packets are
translated and forwarded by a network address translator (NAT) or by
a simple firewall. It also allows a host to optimize its outgoing
NAT keepalive messages.
In order to provide integrity protection for PCP messages, a message
authentication mechanism for PCP is defined in
[I-D.ietf-pcp-authentication]. Three components are defined in
[I-D.ietf-pcp-authentication]: (1) PCP options for providing per-
packet origin authentication, integrity and replay protection, (2)
PCP Security Association (SA) for generating the aforementioned
options, and (3) PCP options for generating PCP SA from execution of
EAP authentication.
The third component seems to define a new EAP lower-layer within PCP.
In this document, PANA (Protocol for carrying Authentication for
Network Access) [RFC5191] is proposed instead of defining a new EAP
lower-layer. This draft along with other two components described in
[I-D.ietf-pcp-authentication] provides a complete solution which
otherwise will duplicate the work of transporting EAP over UDP. The
proposed solution can run over a single PCP port.
1.1. Specification of Requirements
In this document, several words are used to signify the requirements
of the specification. These words are often capitalized. The key
words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD",
"SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document
are to be interpreted as described in RFC 2119 [RFC2119].
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2. Establishing a PCP SA
A PaC (PANA Client) on the PCP client node initiates PANA
authentication over the PCP port number (To be assigned for PCP
[I-D.ietf-pcp-base]) prior to sending an authenticated PCP message.
The initiation is requested by the PCP client. We assume that a PAA
(PANA Authentication Agent) is implemented on each PCP server that
supports authenticated PCP messages. Therefore, the PCP server's IP
address is used as the address of the PAA. The PANA authentication
for establishing a PCP SA is dedicated to the PCP usage only.
PANA authentication for establishing a PCP SA is conducted using PCP
AUTH Opcode. An AUTH request or response carries a PANA PDU (PANA
header and payload) in its Opcode-specific information
[I-D.ietf-pcp-base]. Any PANA message sent by the PCP client is
carried in an AUTH request, and any PANA message sent by the PCP
server is carried in an AUTH response. The PCP retransmission
mechanism SHOULD NOT be used for Auth Opcode to avoid double-layer
retransmission.
If the PCP server does not support AUTH Opcode but it receives an
AUTH request, it returns an "UNSUPP_OPCODE" result code.
If the PCP server that requires authenticated PCP message receives an
unauthenticated PCP request other than an AUTH request, it returns an
"AUTHENTICATION_REQUIRED" result code.
Upon successful PANA authentication, the message authentication key
for PCP message is derived from the EAP MSK as follows:
PCP_AUTH_KEY = prf+(MSK, "IETF PCP" | SID | KID)
where where | denotes concatenation.
o The prf+ function is defined in IKEv2 [RFC5996]. The pseudo-
random function to be used for the prf+ function is negotiated
using PRF-Algorithm AVP in the initial PANA-Auth-Request and PANA-
Auth-Answer exchange with 'S' (Start) bit set, as defined in
[RFC5191].
o "IETF PCP" is the ASCII code representation of the non-NULL
terminated string (excluding the double quotes around it).
o SID is a four-octet PANA Session Identifier [RFC5191].
o KID is the content of the Key-ID AVP [RFC5191] associated with the
MSK.
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The same integrity algorithm used for the PANA session MUST be used
for PCP message authentication.
The PCP_AUTH_KEY and its associated parameters (i.e., the IP
addresses of the PCP client and PCP server, PANA Session ID, Key ID,
message authentication algorithm and lifetime) are passed from the
PAA application to the PCP server application on the same PCP server
device, and also passed from the PaC application to the PCP client
application on the same PCP client node, using an API. The API can
be implementation-specific, and therefore is not specified in this
document. The PANA Session ID and Key ID are used in the
corresponding fields (Session ID, Key ID) of the Authentication Tag
Option.
Once a PCP SA is established, any PCP message that does not contain a
valid Authentication Tag and a fresh Nonce under the current PCP SA
MUST be silently discarded.
The PCP SA MUST be immediately deleted when the corresponding PANA SA
is deleted. The PCP SA SHALL remain as long as the corresponding
PANA SA exists.
If a PCP SA needs to be updated, the PCP client or the PCP server
SHALL initiate PANA re-authentication phase. If a PCP SA needs to be
re-established after expiration or loss of the SA for an existing PCP
mapping state, the PCP client or the PCP server SHALL initiate PANA
authentication and authorization phase.
3. Security Considerations
The key provisioning mechanism described in this document provides a
cryptographic binding between a PANA session and a PCP SA based on
using the PANA session identifier and key identifier in the
PCP_AUTH_KEY derivation function.
For EAP channel binding [RFC6677], it is required for a PAA to
distinguish whether PANA authentication is conducted for network
access authentication or PCP authentication. Such a distinction can
be made using the assigned port number over which the PANA
authentication is conducted, namely, the PANA authentication is
conducted for PCP authentication when the port number is the PCP port
number (to be assigned), and it is for network access authentication
when the port number is the PANA port number (716). How the
corresponding information is conveyed from the PAA to the
authentication server is outside the scope of this document.
4. IANA Considerations
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A new PCP Opcode for AUTH needs to be allocated. The usage of the
AUTH Opcode is described in Section 2.
A new result code for "AUTHENTICATION_REQUIRED" needs to be
allocated. The usage of the "AUTHENTICATION_REQUIRED" result code is
described in Section 2.
5. Acknowledgments
TBD.
6. Normative References
[I-D.ietf-pcp-authentication]
Wasserman, M., Hartman, S., and D. Zhang, "Port Control
Protocol (PCP) Authentication Mechanism", draft-ietf-pcp-
authentication-01 (work in progress), October 2012.
[I-D.ietf-pcp-base]
Wing, D., Cheshire, S., Boucadair, M., Penno, R., and P.
Selkirk, "Port Control Protocol (PCP)", draft-ietf-pcp-
base-29 (work in progress), November 2012.
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119, March 1997.
[RFC5191] Forsberg, D., Ohba, Y., Patil, B., Tschofenig, H., and A.
Yegin, "Protocol for Carrying Authentication for Network
Access (PANA)", RFC 5191, May 2008.
[RFC5996] Kaufman, C., Hoffman, P., Nir, Y., and P. Eronen,
"Internet Key Exchange Protocol Version 2 (IKEv2)", RFC
5996, September 2010.
[RFC6677] Hartman, S., Clancy, T., and K. Hoeper, "Channel-Binding
Support for Extensible Authentication Protocol (EAP)
Methods", RFC 6677, July 2012.
Authors' Addresses
Yoshihiro Ohba
Toshiba Corporate Research and Development Center
1 Komukai-Toshiba-cho
Saiwai-ku, Kawasaki, Kanagawa 212-8582
Japan
Phone: +81 44 549 2127
Email: yoshihiro.ohba@toshiba.co.jp
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Alper Yegin
Samsung
Istanbul
Turkey
Email: alper.yegin@yegin.org
Subir Das
Applied Communication Sciences
1 Telcordia Drive
Piscataway, NJ 08854
USA
Email: sdas@appcomsci.com
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