Network Working Group L. Morand (Ed.)
Internet-Draft France Telecom R&D
Expires: January 1, 2007 S. Kumar
Samsung India Software Operations
A. Yegin
Samsung Advanced Institute of
Technology
S. Madanapalli
Samsung India Software Operations
June 30, 2006
DHCP options for PANA Authentication Agents
draft-ietf-dhc-paa-option-03
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Copyright Notice
Copyright (C) The Internet Society (2006).
Abstract
This document defines new DHCPv4 and DHCPv6 options that contain a
list of IP addresses to locate one or more of PANA Authentication
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Agents. This is one of the many methods that a PANA Client can use
to locate PANA Authentication Agents.
Requirements Language
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].
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . . 3
3. Requirements . . . . . . . . . . . . . . . . . . . . . . . . . 3
4. DHCP Specification Dependency . . . . . . . . . . . . . . . . . 3
5. PANA Authentication Agent DHCPv4 Option . . . . . . . . . . . . 4
6. PANA Authentication Agent DHCPv6 Option . . . . . . . . . . . . 4
7. IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 5
8. Security Considerations . . . . . . . . . . . . . . . . . . . . 6
9. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 6
10. Normative References . . . . . . . . . . . . . . . . . . . . . 6
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 7
Intellectual Property and Copyright Statements . . . . . . . . . . 8
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1. Introduction
The Protocol for carrying Authentication for Network Access (PANA)
[I-D.ietf-pana-pana] defines a new Extensible Authentication Protocol
(EAP) lower layer that uses IP between the protocol end points.
The PANA protocol is run between a PANA Client (PaC) and a PANA
Authentication Agent (PAA) in order to perform authentication and
authorization for the network access service.
This document specifies DHCPv4 [RFC2131] and DHCPv6 [RFC3315] options
that allow PANA client (PaC) to discover PANA Authentication Agents
(PAA). This is one of the many methods for locating PANA
Authentication Agents: manual configuration is an example of another
one.
2. Terminology
This document uses the PANA terminology defined in [I-D.ietf-pana-
pana].
This document uses the DHCP terminology defined in [RFC2131],
[RFC2132] and [RFC3315].
3. Requirements
The keywords MUST, MUST NOT, REQUIRED, SHALL, SHALL NOT, SHOULD,
SHOULD NOT, RECOMMENDED, MAY, and OPTIONAL, when they appear in this
document, are to be interpreted as described in [RFC2119].
4. DHCP Specification Dependency
This document describes new options for DHCPv4 and DHCPv6 for
obtaining a list of IP addresses to locate a PANA Authentication
Agent.
This document should be read in conjunction with the DHCPv4
specifications [RFC2131], [RFC2132] and DHCPv6 specification
[RFC3315].
Definitions for terms and acronyms not specifically defined in this
document are defined in [RFC2131], [RFC2132] and [RFC3315].
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5. PANA Authentication Agent DHCPv4 Option
This section defines a DHCPv4 option that carries a list of 32-bit
(binary) IPv4 addresses indicating one or more PANA Authentication
Agents (PAA) available to the PANA client.
The DHCPv4 option for PANA Authentication Agent has the format shown
in Fig. 1.
0 1
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| option-code | option-length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
+ PAA IPv4 Address +
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| ... |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Figure 1: PAA DHCPv4 option
option-code: OPTION_PANA_AGENT (TBD)
option-length: Length of the 'options' field in octets;
Must be a multiple of four (4)
PAA IPv4 Address: IPv4 address of a PAA for the client to use.
The PAAs are listed in the order of preference
for use by the client.
A DHCPv4 client requests the PAA DHCPv4 Option in a Parameter Request
List as described in [RFC2131] and [RFC2132].
The DHCPv4 client MUST try the records in the order listed in the PAA
DHCPv4 option.
6. PANA Authentication Agent DHCPv6 Option
This section defines a DHCPv6 option that carries a list of 128-bit
(binary) IPv6 addresses indicating one or more PANA Authentication
Agents (PAA) available to the PANA client.
The DHCPv6 option for PANA Authentication Agent has the format shown
in Fig. 2.
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0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| option-code | option-length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
+ +
| |
+ PAA IPv6 Address +
| |
+ +
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| .... |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Figure 2: PAA DHCPv6 option
option-code: OPTION_PANA_AGENT (TBD)
option-length: Length of the 'options' field in octets;
Must be a multiple of sixteen (16)
PAA IPv6 Address: IPv6 address of a PAA for the client to use.
The PAAs are listed in the order of preference
for use by the client.
A DHCPv6 client requests the PAA DHCPv6 option in an Options Request
Option (ORO) as described in the DHCPv6 specification [RFC3315].
The DHCPv6 client MUST try the records in the order listed in the PAA
DHCPv6 option.
7. IANA Considerations
The following DHCPv4 option code for PANA Authentication Agent option
must be assigned by IANA:
Option Name Value Described in
-----------------------------------------------
OPTION_PANA_AGENT TBD Section 5
The following DHCPv6 option codes for PANA Authentication Agent
options must be assigned by IANA:
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Option Name Value Described in
------------------------------------------------
OPTION_PANA_AGENT TBD Section 6
8. Security Considerations
The security considerations in [RFC2131], [RFC2132] and [RFC3315]
apply. If an adversary manages to modify the response from a DHCP
server or insert its own response, a PANA Client could be led to
contact a rogue PANA Agent, possibly one that then intercepts call
requests or denies service.
9. Acknowledgements
Thanks to Ralph Droms, Stig Venaas, Ted Lemon, Andre Kostur and
Bernie Volz for their valuable comments.
10. Normative References
[I-D.ietf-pana-pana]
Forsberg, D., "Protocol for Carrying Authentication for
Network Access (PANA)", draft-ietf-pana-pana-11 (work in
progress), March 2006.
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119, March 1997.
[RFC2131] Droms, R., "Dynamic Host Configuration Protocol",
RFC 2131, March 1997.
[RFC2132] Alexander, S. and R. Droms, "DHCP Options and BOOTP Vendor
Extensions", RFC 2132, March 1997.
[RFC2434] Narten, T. and H. Alvestrand, "Guidelines for Writing an
IANA Considerations Section in RFCs", BCP 26, RFC 2434,
October 1998.
[RFC3315] Droms, R., Bound, J., Volz, B., Lemon, T., Perkins, C.,
and M. Carney, "Dynamic Host Configuration Protocol for
IPv6 (DHCPv6)", RFC 3315, July 2003.
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Authors' Addresses
Lionel Morand
France Telecom R&D
38-40 rue du general Leclerc
92794 Issy-Les-Moulineaux Cedex 9
France
Phone: +33 1 45296257
Email: lionel.morand@orange-ft.com
Suraj Kumar
Samsung India Software Operations
No. 66/1, BAGMANE TECH PARK, C V RAMAN NAGAR
Bangalore
India
Phone: +91 80 41819999
Email: suraj.kumar@samsung.com
Alper E. Yegin
Samsung Advanced Institute of Technology
75 West Plumeria Drive
San Jose, CA 95134
USA
Phone: +1 408 544 5656
Email: alper.yegin@samsung.com
Syam Madanapalli
Samsung India Software Operations
No. 66/1, BAGMANE TECH PARK, C V RAMAN NAGAR
Bangalore
India
Phone: +91 80 41819999
Email: syam@samsung.com
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