DNS Extenstions Working Group R. Arends
Internet-Draft Nominet
Intended status: Experimental J. Schlyter
Expires: November 10, 2007 Kirei AB
May 9, 2007
The DNSSEC Lookaside Validation Pointer (DLVPTR) Resource Record
draft-arends-dnsext-dlvptr-00
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Copyright (C) The IETF Trust (2007).
Abstract
This document defines the DNSSEC Lookaside Validation Pointer
(DLVPTR) Resource Record (RR), for publishing pointers to DNSSEC
Lookaside Validation (DLV) records.
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
2. DLVPTR Processing . . . . . . . . . . . . . . . . . . . . . . . 3
3. The DLVPTR Resource Record . . . . . . . . . . . . . . . . . . 3
3.1. The DLVPTR RDATA Format . . . . . . . . . . . . . . . . . . 3
3.2. Presentation Format of the DLVPTR RR . . . . . . . . . . . 4
4. Security Considerations . . . . . . . . . . . . . . . . . . . . 4
5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 4
6. References . . . . . . . . . . . . . . . . . . . . . . . . . . 4
6.1. Normative References . . . . . . . . . . . . . . . . . . . 4
6.2. Informative References . . . . . . . . . . . . . . . . . . 4
Appendix A. Acknowledgements . . . . . . . . . . . . . . . . . . . 5
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 5
Intellectual Property and Copyright Statements . . . . . . . . . . 6
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1. Introduction
DNSSEC Lookaside Validation (DLV) [4] [2][5] is a method to publish
Trust Anchors (TAs) for islands of security [3] outside the
delegation chain. This, in turn, has the potential for efficient TA
management on the validator, as the validator can configure the TA
for the DLV repository, instead of TAs for each island of security.
Due to the design of DLV it is not efficient to have more than a few
TAs for DLV repositories. DLV requires the validator to send
additional requests to each DLV repository for each response, for
which there is no configured TA.
This memo introduces a change to the design of DLV. An island of
security can publish a pointer (DLVPTR) to the DLV repository of
choice. When the validator has a configured TA for this DLV,
additional requests will be send to just this DLV.
This change allows configuration of multiple DLV TAs in a validator
without significantly degrading response times.
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 [1].
2. DLVPTR Processing
A Security Aware Resolver sends requests with the DNSSEC-OK bit set,
regardless of any configured TA. It expects the zone at a configured
TA to be secured, and thus responses to contain DNSSEC records.
When a Security Aware Resolver has no TAs configured for a requested
name, and has one or more DLV-TAs configured, and receives a response
for that name containing DNSSEC records, it sends a request for a
DLVPTR to the highest point in the delegation chain that contained
DNSSEC records.
DLV-ANCHOR && DLVPTR && DLV == record
DLV-ANCHOR && (!DLV) == remove
3. The DLVPTR Resource Record
3.1. The DLVPTR RDATA Format
The DLVPTR (type=TBD) record contains a domain name.
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+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
/ DLVPTRDNAME /
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
A DLVPTR record causes no additional section processing. DLVPTR RRs
are used in domains to point to some other location in the domain
space.
3.2. Presentation Format of the DLVPTR RR
The RDATA of the presentation format of the DLVPTR resource record
consists of one string (the domain name of the target DLV [2]), e.g.:
example.net. DLVPTR xyzzy.dlv.arpa.
4. Security Considerations
5. IANA Considerations
IANA needs to allocate a RR type code for DLVPTR from the standard RR
type space (type 50 requested).
6. References
6.1. Normative References
[1] Bradner, S., "Key words for use in RFCs to Indicate Requirement
Levels", BCP 14, RFC 2119, March 1997.
[2] Andrews, M. and S. Weiler, "The DNSSEC Lookaside Validation
(DLV) DNS Resource Record", RFC 4431, February 2006.
6.2. Informative References
[3] Arends, R., Austein, R., Larson, M., Massey, D., and S. Rose,
"DNS Security Introduction and Requirements", RFC 4033,
March 2005.
[4] Vixie, P. and M. Andrews, "DNSSEC Lookaside Validation (DLV)",
ISC-TN 2006-1, April 2006.
[5] Weiler, S., "DNSSEC Lookaside Validation (DLV)",
draft-weiler-dnssec-dlv-02 (work in progress), March 2007.
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Appendix A. Acknowledgements
The author gratefully acknowledges, in no particular order, the
contributions of the following persons:
Geoffrey Sisson
Authors' Addresses
Roy Arends
Nominet
Sandford Gate
Sandy Lane West
Oxford OX4 6LB
United Kingdom
Phone: +44 1865 332211
Email: roy@nominet.org.uk
Jakob Schlyter
Kirei AB
P.O. Box 53204
Goteborg SE-400 16
Sweden
Phone: +46 31 787 80 07
Email: jakob@kirei.se
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