DNSEXT J. Reid Internet-Draft Telnic Ltd Expires: May 15, 2008 J. Schlyter Kirei AB B. Timms Telnic Ltd November 12, 2007 The NKEY DNS Resource Record Status of this Memo By submitting this Internet-Draft, each author represents that any applicable patent or other IPR claims of which he or she is aware have been or will be disclosed, and any of which he or she becomes aware will be disclosed, in accordance with Section 6 of BCP 79. 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. This Internet-Draft will expire on May 15, 2008. Copyright Notice Copyright (C) The IETF Trust (2007). Reid, et al. Expires May 15, 2008 [Page 1] Internet-Draft The NKEY DNS Resource Record November 2007 Abstract A DNS Resource record which can be used to encrypt NAPTR records is described in this document. Table of Contents 1. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 3 2. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 4 3. Definition of NKEY Resource Record . . . . . . . . . . . . . . 5 4. Security Considerations . . . . . . . . . . . . . . . . . . . 6 5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 7 6. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 8 7. References . . . . . . . . . . . . . . . . . . . . . . . . . . 9 7.1. Normative References . . . . . . . . . . . . . . . . . . . 9 7.2. Informative References . . . . . . . . . . . . . . . . . . 9 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 11 Intellectual Property and Copyright Statements . . . . . . . . . . 12 Reid, et al. Expires May 15, 2008 [Page 2] Internet-Draft The NKEY DNS Resource Record November 2007 1. Terminology 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 BCP 14, RFC2119 [12]. Reid, et al. Expires May 15, 2008 [Page 3] Internet-Draft The NKEY DNS Resource Record November 2007 2. Introduction The DNS protocol is defined in RFC1034[1], RFC1035[2] and clarified in RFC2181[3]. The scope for using DNS KEY Resource Records was limited in RFC3445[4] to keys used by the Domain Name System Security Extensions (DNSSEC) which is defined in RFC4033[5], RFC4034[6] And RFC4035[7]. The original KEY RR used sub-typing to store both DNSSEC keys and arbitrary application keys. Storing both DNSSEC and application keys with the same record type is a mistake so RFC3445 removed application keys from the KEY record by redefining the Protocol Octet field in the KEY RR Data. This means that any other uses of keying material in the DNS need to define a new RRtype and mnemonic. This document advocates the introduction of a new resource record specifically to provide this type of information for keys that encrypt NAPTR records [8]. A scheme for encrypting NAPTR records is outlined in draft-timms-encrypt-naptr [9]. Reid, et al. Expires May 15, 2008 [Page 4] Internet-Draft The NKEY DNS Resource Record November 2007 3. Definition of NKEY Resource Record The NKEY RR uses an IANA-assigned type code and is used as resource record for storing keys which encrypt NAPTR records. The RDATA for a NKEY RR consists of flags, a protocol octet, the algorithm number octet, and the public key itself. The format is as follows: NKEY RDATA format 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 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 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | flags | protocol | algorithm | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | / / public key / / / +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ All bits of the flags field are reserved and MUST be zero. The protocol field MUST be set to 1. The algorithm and public key fields are identical to the definitions used in RFC4034 [6]. Reid, et al. Expires May 15, 2008 [Page 5] Internet-Draft The NKEY DNS Resource Record November 2007 4. Security Considerations The format and correct usage of DNSSEC keys is not changed by this document and no new security considerations are introduced. Reid, et al. Expires May 15, 2008 [Page 6] Internet-Draft The NKEY DNS Resource Record November 2007 5. IANA Considerations IANA is requested to issue a new type code and mnemonic for the proposed resource record. No other IANA services are required by this document. Reid, et al. Expires May 15, 2008 [Page 7] Internet-Draft The NKEY DNS Resource Record November 2007 6. Acknowledgements The authors would like to thank Klaus Malorny, Lawrence Conroy and Roy Arends for their constructive suggestions to this document and for helping to identify potential uses for the proposed record type. Reid, et al. Expires May 15, 2008 [Page 8] Internet-Draft The NKEY DNS Resource Record November 2007 7. References 7.1. Normative References [1] Mockapetris, P., "DOMAIN NAMES - CONCEPTS AND FACILITIES", RFC 1034, November 1987. [2] Mockapetris, P., "Domain names - implementation and specification", STD 13, RFC 1035, November 1987. [3] Elz, R. and R. Bush, "Clarifications to the DNS Specification", RFC 2181, July 1997. [4] Massey, D. and S. Rose, "Limiting the Scope of the KEY Resource Record (RR)", RFC 3445, December 2002. [5] Arends, R., Austein, R., Larson, M., Massey, D., and S. Rose, "DNS Security Introduction and Requirements", RFC 4033, March 2005. [6] Arends, R., Austein, R., Larson, M., Massey, D., and S. Rose, "Resource Records for the DNS Security Extensions", RFC 4034, March 2005. [7] Arends, R., Austein, R., Larson, M., Massey, D., and S. Rose, "Protocol Modifications for the DNS Security Extensions", RFC 4035, March 2005. [8] Mealling, M., "Dynamic Delegation Discovery System (DDDS) Part Three: The Domain Name System (DNS) Database", RFC 3403, October 2002. [9] Timms, B., Reid, J., and J. Schlyter, "IANA Registration for Encrypted ENUM", draft-timms-enum-encrypt-00 (work in progress), November 2007. [10] Braden, R., "Requirements for Internet Hosts -- Application and Support", RFC 1123, October 1989. [11] Berners-Lee, T., Fielding, R., and L. Masinter, "Uniform Resource Identifier (URI): Generic Syntax", STD 66, RFC 3986, January 2005. 7.2. Informative References [12] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", RFC 2119, BCP 14, March 1997. Reid, et al. Expires May 15, 2008 [Page 9] Internet-Draft The NKEY DNS Resource Record November 2007 [13] Faltstrom, P. and M. Mealling, "The E.164 to Uniform Resource Identifiers (URI) Dynamic Delegation Discovery System (DDDS) Application (ENUM)", RFC 3761, April 2004. [14] Atkins, D. and R. Austein, "Threat Analysis of the Domain Name System (DNS)", RFC 3833, August 2004. [15] Bradner, S., "The Internet Standards Process -- Revision 3", RFC 2026, BCP 9, October 1996. [16] Bradner, S., "IETF Rights in Contributions", BCP 78, RFC 3978, March 2005. [17] Bradner, S., "Intellectual Property Rights in IETF Technology", BCP 79, RFC 3979, March 2005. Reid, et al. Expires May 15, 2008 [Page 10] Internet-Draft The NKEY DNS Resource Record November 2007 Authors' Addresses Jim Reid Telnic Ltd 6 Langside Court Bothwell, SCOTLAND United Kingdom Phone: +44 20 7282 0000 Email: jim@telnic.org Jakob Schlyter Kirei AB PO Box 53204 Goteborg, SE 40016 Sweden Phone: +46 31 787 8007 Email: jakob@kirei.se Ben Timms Telnic Ltd 8 Wilfred Street London, SW1T 6PL United Kingdom Phone: +44 20 7282 0000 Email: btimms@telnic.org Reid, et al. Expires May 15, 2008 [Page 11] Internet-Draft The NKEY DNS Resource Record November 2007 Full Copyright Statement Copyright (C) The IETF Trust (2007). This document is subject to the rights, licenses and restrictions contained in BCP 78, and except as set forth therein, the authors retain all their rights. 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Information on the procedures with respect to rights in RFC documents can be found in BCP 78 and BCP 79. Copies of IPR disclosures made to the IETF Secretariat and any assurances of licenses to be made available, or the result of an attempt made to obtain a general license or permission for the use of such proprietary rights by implementers or users of this specification can be obtained from the IETF on-line IPR repository at http://www.ietf.org/ipr. The IETF invites any interested party to bring to its attention any copyrights, patents or patent applications, or other proprietary rights that may cover technology that may be required to implement this standard. Please address the information to the IETF at ietf-ipr@ietf.org. Acknowledgment Funding for the RFC Editor function is provided by the IETF Administrative Support Activity (IASA). Reid, et al. Expires May 15, 2008 [Page 12]