draft-ietf-dhc-suboptions-kdc-serveraddress-00.txt   draft-ietf-dhc-suboptions-kdc-serveraddress-01.txt 
INTERNET-DRAFT K. Luehrs INTERNET-DRAFT K. Luehrs
Dynamic Host Control Working Group CableLabs Dynamic Host Configuration Working Group CableLabs
Expires March 2003 J. Bevilacqua Expires March 2003 R. Woundy
AT&T Broadband
J. Bevilacqua
YAS Corporation YAS Corporation
September 2002 September 2002
KDC Server Address Sub-option KDC Server Address Sub-option
< draft-ietf-dhc-suboptions-kdc-serveraddress-00.txt> <draft-ietf-dhc-suboptions-kdc-serveraddress-01.txt>
Status of this Memo Status of this Memo
This document is an Internet-Draft and is in full conformance with This document is an Internet-Draft and is in full conformance with
all provisions of Section 10 of RFC2026. all provisions of Section 10 of RFC2026.
Internet-Drafts are working documents of the Internet Engineering Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF), its areas, and its working groups. Note that Task Force (IETF), its areas, and its working groups. Note that
other groups may also distribute working documents as Internet- other groups may also distribute working documents as Internet-
Drafts. Drafts.
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http://www.ietf.org/shadow.html. http://www.ietf.org/shadow.html.
Copyright Notice Copyright Notice
Copyright (C) The Internet Society (2002). All Rights Reserved. Copyright (C) The Internet Society (2002). All Rights Reserved.
Abstract Abstract
This document defines a new sub-option for the CableLabs Client This document defines a new sub-option for the CableLabs Client
Configuration (CCC) DHCP option code for conveying the network Configuration (CCC) DHCP option code for conveying the network
address of the Key Distribution Center (KDC) server. addresses of Key Distribution Center (KDC) servers.
1. Introduction 1. Introduction
The need for a CCC DHCP Option code is described in [1]. The CCC The need for a CCC DHCP Option code is described in [1]. The CCC
DHCP option code will be used to address specific needs of CableLabs DHCP option code will be used to address specific needs of CableLabs
client devices during their configuration processes. This document client devices during their configuration processes. This document
proposes a sub-option for the CCC DHCP option. proposes a sub-option for the CCC DHCP option.
Luehrs, Woundy, & Bevilacqua Expires March 2003 [Page 1]
Configuration of a class of CableLabs client devices described in Configuration of a class of CableLabs client devices described in
[2] requires a DHCP sub-option to provide the client with the [2] requires a DHCP sub-option to provide the client with the
address of the cable operator's KDC server. This document proposes network address of a KDC server in the cable operator's data
an additional sub-option for use with CableLabs client devices. The network. The class of devices assumed in [2] is unlike the class
sub-option encodes an identifier of the network address for the Key of devices considered in [1], which perform a DNS lookup of the
Distribution Center server with which the CableLabs client device Kerberos Realm name to find the KDC server network address.
must exchange security information.
CableLabs plans to assign sub-option code ranges according to This document proposes a sub-option of the CCC DHCP option
CableLabs projects. The range (51 - 100) is assigned to the code for use with CableLabs client devices. The proposed sub-option
CableHome project. Use of the initial value of this range is encodes an identifier for the network address of each of one or more
Key Distribution Center servers with which the CableLabs client
device exchanges security information.
CableLabs plans to assign sub-option code ranges for the CCC option
according to CableLabs projects. The range (51 - 100) is assigned
to the CableHome project. Use of the initial value of this range is
specified in [2]. specified in [2].
The key words "MUST", "MUST NOT", "SHOULD", "SHOULD NOT" and "MAY" The key words "MUST", "MUST NOT", "SHOULD", "SHOULD NOT" and "MAY"
in this document are to be interpreted as described in RFC 2119 [3]. in this document are to be interpreted as described in RFC 2119 [3].
2. Key Distribution Center IP Address Sub-option 2. Key Distribution Center IP Address Sub-option
The CableHome 1.0 specification [2] specifies the Key Distribution The CableHome 1.0 specification [2] specifies the Key Distribution
Center network address encoding as a sub-option of the CCC DHCP Center network address encoding as a sub-option of the CCC DHCP
Option code. This field is used to inform the client device of the Option code. This field is used to inform the client device of the
network address of the Key Distribution Center server. network address of one or more Key Distribution Center servers.
The encoding of sub-option 51 will adhere to the format of an IPv4
address using the default port. The sub-option length MUST be 4. The
length octet MUST be followed by 4 octets of IPv4 address.
The KDC Server sub-option is coded as follows: The encoding of the KDC Server Address sub-option will adhere to the
format of an IPv4 address using the default port. The minimum length
for this option is 4 octets, and the length MUST always be a
multiple of 4. If multiple KDC Servers are listed, they MUST be
listed in decreasing order of priority. The format of the KDC Server
Address sub-option of the CCC option code is as shown below:
SubOpt Len Address SubOpt Len Address 1 Address 2
+------+-----+------+------+------+------+ +------+-----+-----+-----+-----+-----+-----+-----+--
| 51 | 4 | a1 | a2 | a3 | a4 | | 51 | n | a1 | a2 | a3 | a4 | a1 | a2 | ...
+------+-----+------+------+------+------+ +------+-----+-----+-----+-----+-----+-----+-----+--
3. Security Considerations 3. Security Considerations
This document relies upon the DHCP protocol [4] for authentication This document relies upon the DHCP protocol [4] for authentication
and security, i.e., it does not provide security in excess of what and security, i.e., it does not provide security in excess of what
DHCP is (or will be) providing. It does not expose any security DHCP is (or will be) providing. It does not expose any security
threats beyond what is currently exposed by other DHCP options. threats beyond what is currently exposed by other DHCP options.
4. IANA Considerations 4. IANA Considerations
IANA has assigned a value of 51 for the CableLabs Client The KDC Server Address sub-option described in this document is
Configuration (CCC) sub-option code described in [1] and referred intended to be a sub-option of the CableLabs Client Configuration
to in this document. (CCC) option described in [1]. IANA will be requested to register
sub-option code 51 of the CCC option to the KDC Server Address
sub-option.
5. Normative References 5. Normative References
[1] "DHCP Option for CableLabs Client Configuration draft-ietf-dhc- [1] "DHCP Option for CableLabs Client Configuration draft-ietf-dhc-
packetcable-03", IETF, July 2002. packetcable-03", IETF, July 2002.
[2] "CableHome 1.0 Specification SP-CH1.0-I02-020920", CableLabs, [2] "CableHome 1.0 Specification SP-CH1.0-I02-020920", CableLabs,
September 2002, http://www.cablelabs.com/cablehome/specifications September 2002, http://www.cablelabs.com/projects/cablehome/
specifications/.
[3] Bradner, S., "Key words for use in RFCs to Indicate Requirement [3] Bradner, S., "Key words for use in RFCs to Indicate Requirement
Levels", BCP 14, RFC 2119, March 1997. Levels", BCP 14, RFC 2119, March 1997.
[4] Droms, R., "Dynamic Host Configuration Protocol", RFC 2131, March [4] Droms, R., "Dynamic Host Configuration Protocol", RFC 2131, March
1997. 1997.
6. Authors' Addresses 6. Authors' Addresses
Kevin Luehrs Kevin Luehrs
CableLabs CableLabs
400 Centennial Parkway 400 Centennial Parkway
Louisville, CO 80027 Louisville, CO 80027
Phone: (303) 661-9100 Phone: (303) 661-9100
EMail: k.luehrs@cablelabs.com EMail: k.luehrs@cablelabs.com
Richard Woundy
AT&T Broadband
27 Industrial Drive
Chelmsford, MA 01824
Phone: (978) 244-4010
EMail: rwoundy@broadband.att.com
John Bevilacqua John Bevilacqua
YAS Corporation YAS Corporation
300 Brickstone Square 300 Brickstone Square
Andover, MA 01810 Andover, MA 01810
Phone: (978) 749-9999 Phone: (978) 749-9999
EMail: john@yas.com EMail: john@yas.com
7. Full Copyright Statement 7. Full Copyright Statement
Copyright (C) The Internet Society (2002). All Rights Reserved. Copyright (C) The Internet Society (2002). All Rights Reserved.
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