INTERNET-DRAFT K. Luehrs Dynamic Host Control Working Group CableLabs Expires March 2003 J. Bevilacqua YAS Corporation September 2002 KDC Server Address Sub-option < draft-ietf-dhc-suboptions-kdc-serveraddress-00.txt> Status of this Memo This document is an Internet-Draft and is in full conformance with all provisions of Section 10 of RFC2026. Internet-Drafts are working documents of the Internet Engineering Task Force (IETF), its areas, and its working groups. Note that other groups may also distribute working documents as Internet- Drafts. Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any time. It is inappropriate to use Internet-Drafts as reference material or to cite them other than as "work in progress." The list of current Internet-Drafts can be accessed at http://www.ietf.org/ietf/1id-abstracts.txt The list of Internet-Draft Shadow Directories can be accessed at http://www.ietf.org/shadow.html. Copyright Notice Copyright (C) The Internet Society (2002). All Rights Reserved. Abstract This document defines a new sub-option for the CableLabs Client Configuration (CCC) DHCP option code for conveying the network address of the Key Distribution Center (KDC) server. 1. Introduction 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 client devices during their configuration processes. This document proposes a sub-option for the CCC DHCP option. Luehrs and Bevilacqua Expires March 2003 [Page 1] Internet Draft KDC Server Address Sub-option September 2002 Configuration of a class of CableLabs client devices described in [2] requires a DHCP sub-option to provide the client with the address of the cable operator's KDC server. This document proposes an additional sub-option for use with CableLabs client devices. The sub-option encodes an identifier of the network address for the Key Distribution Center server with which the CableLabs client device must exchange security information. CableLabs plans to assign sub-option code ranges 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]. The key words "MUST", "MUST NOT", "SHOULD", "SHOULD NOT" and "MAY" in this document are to be interpreted as described in RFC 2119 [3]. 2. Key Distribution Center IP Address Sub-option The CableHome 1.0 specification [2] specifies the Key Distribution 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 network address of the Key Distribution Center server. 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: SubOpt Len Address +------+-----+------+------+------+------+ | 51 | 4 | a1 | a2 | a3 | a4 | +------+-----+------+------+------+------+ 3. Security Considerations This document relies upon the DHCP protocol [4] for authentication 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 threats beyond what is currently exposed by other DHCP options. 4. IANA Considerations IANA has assigned a value of 51 for the CableLabs Client Configuration (CCC) sub-option code described in [1] and referred to in this document. Luehrs and Bevilacqua Expires March 2003 [Page 2] Internet Draft KDC Server Address Sub-option September 2002 5. Normative References [1] "DHCP Option for CableLabs Client Configuration draft-ietf-dhc- packetcable-03", IETF, July 2002. [2] "CableHome 1.0 Specification SP-CH1.0-I02-020920", CableLabs, September 2002, http://www.cablelabs.com/cablehome/specifications [3] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, March 1997. [4] Droms, R., "Dynamic Host Configuration Protocol", RFC 2131, March 1997. 6. Authors' Addresses Kevin Luehrs CableLabs 400 Centennial Parkway Louisville, CO 80027 Phone: (303) 661-9100 EMail: k.luehrs@cablelabs.com John Bevilacqua YAS Corporation 300 Brickstone Square Andover, MA 01810 Phone: (978) 749-9999 EMail: john@yas.com 7. Full Copyright Statement Copyright (C) The Internet Society (2002). All Rights Reserved. This document and translations of it may be copied and furnished to others, and derivative works that comment on or otherwise explain it or assist in its implementation may be prepared, copied, published and distributed, in whole or in part, without restriction of any kind, provided that the above copyright notice and this paragraph are included on all such copies and derivative works. However, this document itself may not be modified in any way, such as by removing the copyright notice or references to the Internet Society or other Internet organizations, except as needed for the purpose of develop- ing Internet standards in which case the procedures for copyrights defined in the Internet Standards process must be followed, or as required to translate it into languages other than English. The limited permissions granted above are perpetual and will not be revoked by the Internet Society or its successors or assigns. Luehrs and Bevilacqua Expires March 2003 [Page 3] Internet Draft KDC Server Address Sub-option September 2002 This document and the information contained herein is provided on an "AS IS" basis and THE INTERNET SOCIETY AND THE INTERNET ENGINEERING TASK FORCE DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE INFORMATION HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. Luehrs and Bevilacqua Expires March 2003 [Page 4]