CHAIN Query Requests in DNS
RFC 7901
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Type |
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RFC - Experimental
(June 2016; No errata)
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Last updated |
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2016-06-21
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Replaces |
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draft-wouters-edns-chain-query
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Stream |
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IETF
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Formats |
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plain text
pdf
html
bibtex
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WG state
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Submitted to IESG for Publication
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Document shepherd |
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Tim Wicinski
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Shepherd write-up |
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Show
(last changed 2015-11-28)
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| IESG |
IESG state |
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RFC 7901 (Experimental)
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Consensus Boilerplate |
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Yes
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Telechat date |
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Responsible AD |
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Joel Jaeggli
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Send notices to |
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(None)
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| IANA |
IANA review state |
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Version Changed - Review Needed
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IANA action state |
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RFC-Ed-Ack
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Internet Engineering Task Force (IETF) P. Wouters
Request for Comments: 7901 Red Hat
Category: Experimental June 2016
ISSN: 2070-1721
CHAIN Query Requests in DNS
Abstract
This document defines an EDNS0 extension that can be used by a
security-aware validating resolver configured to use a forwarding
resolver to send a single query, requesting a complete validation
path along with the regular query answer. The reduction in queries
potentially lowers the latency and reduces the need to send multiple
queries at once. This extension mandates the use of source-IP-
verified transport such as TCP or UDP with EDNS-COOKIE, so it cannot
be abused in amplification attacks.
Status of This Memo
This document is not an Internet Standards Track specification; it is
published for examination, experimental implementation, and
evaluation.
This document defines an Experimental Protocol for the Internet
community. This document is a product of the Internet Engineering
Task Force (IETF). It represents the consensus of the IETF
community. It has received public review and has been approved for
publication by the Internet Engineering Steering Group (IESG). Not
all documents approved by the IESG are a candidate for any level of
Internet Standard; see Section 2 of RFC 7841.
Information about the current status of this document, any errata,
and how to provide feedback on it may be obtained at
http://www.rfc-editor.org/info/rfc7901.
Wouters Experimental [Page 1]
RFC 7901 CHAIN Query Requests in DNS June 2016
Copyright Notice
Copyright (c) 2016 IETF Trust and the persons identified as the
document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents
(http://trustee.ietf.org/license-info) in effect on the date of
publication of this document. Please review these documents
carefully, as they describe your rights and restrictions with respect
to this document. Code Components extracted from this document must
include Simplified BSD License text as described in Section 4.e of
the Trust Legal Provisions and are provided without warranty as
described in the Simplified BSD License.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1. Requirements Notation . . . . . . . . . . . . . . . . . . 3
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 4
3. Overview . . . . . . . . . . . . . . . . . . . . . . . . . . 4
4. Option Format . . . . . . . . . . . . . . . . . . . . . . . . 5
5. Protocol Description . . . . . . . . . . . . . . . . . . . . 6
5.1. Discovery of Support . . . . . . . . . . . . . . . . . . 6
5.2. Generate a Query . . . . . . . . . . . . . . . . . . . . 6
5.3. Send the Option . . . . . . . . . . . . . . . . . . . . . 6
5.4. Generate a Response . . . . . . . . . . . . . . . . . . . 7
6. Protocol Considerations . . . . . . . . . . . . . . . . . . . 8
6.1. DNSSEC Considerations . . . . . . . . . . . . . . . . . . 8
6.2. NS Record Considerations . . . . . . . . . . . . . . . . 8
6.3. Session Management . . . . . . . . . . . . . . . . . . . 9
6.4. Negative Trust Anchors . . . . . . . . . . . . . . . . . 9
6.5. Anycast Considerations . . . . . . . . . . . . . . . . . 9
7. Security Considerations . . . . . . . . . . . . . . . . . . . 10
7.1. Additional Work and Bandwidth . . . . . . . . . . . . . . 10
7.2. Amplification Attacks . . . . . . . . . . . . . . . . . . 10
7.3. Privacy Considerations . . . . . . . . . . . . . . . . . 10
8. Examples . . . . . . . . . . . . . . . . . . . . . . . . . . 10
8.1. CHAIN Query for "www.example.com" . . . . . . . . . . . . 10
8.2. Out-of-Path Query for "example.com" . . . . . . . . . . . 12
8.3. Nonexistent Data . . . . . . . . . . . . . . . . . . . . 13
9. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 14
9.1. EDNS0 Option Code for CHAIN . . . . . . . . . . . . . . . 14
10. Normative References . . . . . . . . . . . . . . . . . . . . 14
Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . . 16
Author's Address . . . . . . . . . . . . . . . . . . . . . . . . 16
Wouters Experimental [Page 2]
RFC 7901 CHAIN Query Requests in DNS June 2016
1. Introduction
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