Signaling Cryptographic Algorithm Understanding in DNS Security Extensions (DNSSEC)
RFC 6975
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(July 2013; No errata)
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2015-10-14
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RFC-Ed-Ack
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Internet Engineering Task Force (IETF) S. Crocker
Request for Comments: 6975 Shinkuro Inc.
Category: Standards Track S. Rose
ISSN: 2070-1721 NIST
July 2013
Signaling Cryptographic Algorithm Understanding in
DNS Security Extensions (DNSSEC)
Abstract
The DNS Security Extensions (DNSSEC) were developed to provide origin
authentication and integrity protection for DNS data by using digital
signatures. These digital signatures can be generated using
different algorithms. This document specifies a way for validating
end-system resolvers to signal to a server which digital signature
and hash algorithms they support. The extensions allow the signaling
of new algorithm uptake in client code to allow zone administrators
to know when it is possible to complete an algorithm rollover in a
DNSSEC-signed zone.
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/rfc6975.
Crocker & Rose Standards Track [Page 1]
RFC 6975 Algorithm-Signal July 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.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Requirements Language . . . . . . . . . . . . . . . . . . . . . 4
3. Signaling DNSSEC Algorithm Understood (DAU), DS Hash
Understood (DHU), and NSEC3 Hash Understood (N3U) Using EDNS . 4
4. Client Considerations . . . . . . . . . . . . . . . . . . . . . 5
4.1. Stub Resolvers . . . . . . . . . . . . . . . . . . . . . . 5
4.1.1. Validating Stub Resolvers . . . . . . . . . . . . . . . 5
4.1.2. Non-validating Stub Resolvers . . . . . . . . . . . . . 6
4.2. Recursive Resolvers . . . . . . . . . . . . . . . . . . . . 6
4.2.1. Validating Recursive Resolvers . . . . . . . . . . . . 6
4.2.2. Non-validating Recursive Resolvers . . . . . . . . . . 6
5. Intermediate System Considerations . . . . . . . . . . . . . . 6
6. Server Considerations . . . . . . . . . . . . . . . . . . . . . 7
7. Traffic Analysis Considerations . . . . . . . . . . . . . . . . 7
8. IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 8
9. Security Considerations . . . . . . . . . . . . . . . . . . . . 8
10. Normative References . . . . . . . . . . . . . . . . . . . . . 8
Crocker & Rose Standards Track [Page 2]
RFC 6975 Algorithm-Signal July 2013
1. Introduction
The DNS Security Extensions (DNSSEC), [RFC4033], [RFC4034], and
[RFC4035], were developed to provide origin authentication and
integrity protection for DNS data by using digital signatures. Each
digital signature (RRSIG) Resource Record (RR) contains an algorithm
code number that corresponds to a DNSSEC public key (DNSKEY) RR.
These algorithm codes tell validators which cryptographic algorithm
was used to generate the digital signature.
Likewise, the Delegation Signer (DS) RRs and Hashed Authenticated
Denial of Existence (NSEC3) RRs use a hashed value as part of their
resource record data (RDATA) and, like digital signature algorithms,
these hash algorithms have code numbers. All three algorithm codes
(RRSIG/DNSKEY, DS, and NSEC3) are maintained in unique IANA
registries.
This document sets specifies a way for validating end-system
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