Clarifications and Implementation Notes for DNS Security (DNSSEC)
RFC 6840
Document | Type |
RFC - Proposed Standard
(February 2013; Errata)
Updated by RFC 8749
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|
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Authors | Samuel Weiler , David Blacka | ||
Last updated | 2020-01-21 | ||
Replaces | draft-weiler-dnsext-dnssec-bis-updates | ||
Stream | IETF | ||
Formats | plain text html pdf htmlized with errata bibtex | ||
Stream | WG state | Submitted to IESG for Publication | |
Document shepherd | Andrew Sullivan | ||
IESG | IESG state | RFC 6840 (Proposed Standard) | |
Action Holders |
(None)
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Consensus Boilerplate | Unknown | ||
Telechat date | |||
Responsible AD | Ralph Droms | ||
IESG note | Andrew Sullivan (ajs@anvilwalrusden.com) is the document shepherd. | ||
Send notices to | (None) |
Internet Engineering Task Force (IETF) S. Weiler, Ed. Request for Comments: 6840 SPARTA, Inc. Updates: 4033, 4034, 4035, 5155 D. Blacka, Ed. Category: Standards Track Verisign, Inc. ISSN: 2070-1721 February 2013 Clarifications and Implementation Notes for DNS Security (DNSSEC) Abstract This document is a collection of technical clarifications to the DNS Security (DNSSEC) document set. It is meant to serve as a resource to implementors as well as a collection of DNSSEC errata that existed at the time of writing. This document updates the core DNSSEC documents (RFC 4033, RFC 4034, and RFC 4035) as well as the NSEC3 specification (RFC 5155). It also defines NSEC3 and SHA-2 (RFC 4509 and RFC 5702) as core parts of the DNSSEC specification. Status of This Memo This is an Internet Standards Track document. 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). Further information on Internet Standards is available in Section 2 of RFC 5741. 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/rfc6840. Weiler & Blacka Standards Track [Page 1] RFC 6840 DNSSEC Implementation Notes February 2013 Copyright Notice Copyright (c) 2013 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. This document may contain material from IETF Documents or IETF Contributions published or made publicly available before November 10, 2008. The person(s) controlling the copyright in some of this material may not have granted the IETF Trust the right to allow modifications of such material outside the IETF Standards Process. Without obtaining an adequate license from the person(s) controlling the copyright in such materials, this document may not be modified outside the IETF Standards Process, and derivative works of it may not be created outside the IETF Standards Process, except to format it for publication as an RFC or to translate it into languages other than English. Weiler & Blacka Standards Track [Page 2] RFC 6840 DNSSEC Implementation Notes February 2013 Table of Contents 1. Introduction and Terminology ....................................4 1.1. Structure of This Document .................................4 1.2. Terminology ................................................4 2. Important Additions to DNSSEC ...................................4 2.1. NSEC3 Support ..............................................4 2.2. SHA-2 Support ..............................................5 3. Scaling Concerns ................................................5 3.1. Implement a BAD Cache ......................................5 4. Security Concerns ...............................................5 4.1. Clarifications on Nonexistence Proofs ......................5 4.2. Validating Responses to an ANY Query .......................6 4.3. Check for CNAME ............................................6 4.4. Insecure Delegation Proofs .................................7 5. Interoperability Concerns .......................................7 5.1. Errors in Canonical Form Type Code List ....................7 5.2. Unknown DS Message Digest Algorithms .......................7 5.3. Private Algorithms .........................................8 5.4. Caution about Local Policy and Multiple RRSIGs .............9 5.5. Key Tag Calculation ........................................9 5.6. Setting the DO Bit on Replies ..............................9 5.7. Setting the AD Bit on Queries .............................10 5.8. Setting the AD Bit on Replies .............................10 5.9. Always Set the CD Bit on Queries ..........................10 5.10. Nested Trust Anchors .....................................11Show full document text