Signaling Trust Anchor Knowledge in DNS Security Extensions (DNSSEC)
RFC 8145

Document Type RFC - Proposed Standard (April 2017; No errata)
Last updated 2017-04-11
Replaces draft-wessels-edns-key-tag
Stream IETF
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Stream WG state Submitted to IESG for Publication
Document shepherd Tim Wicinski
Shepherd write-up Show (last changed 2016-12-14)
IESG IESG state RFC 8145 (Proposed Standard)
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Send notices to "Tim Wicinski" <tjw.ietf@gmail.com>
IANA IANA review state Version Changed - Review Needed
IANA action state RFC-Ed-Ack
Internet Engineering Task Force (IETF)                        D. Wessels
Request for Comments: 8145                                      Verisign
Category: Standards Track                                      W. Kumari
ISSN: 2070-1721                                                   Google
                                                              P. Hoffman
                                                                   ICANN
                                                              April 2017

  Signaling Trust Anchor Knowledge 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 verified by building a
   chain of trust starting from a trust anchor and proceeding down to a
   particular node in the DNS.  This document specifies two different
   ways for validating resolvers to signal to a server which keys are
   referenced in their chain of trust.  The data from such signaling
   allow zone administrators to monitor the progress of rollovers 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 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/rfc8145.

Wessels, et al.              Standards Track                    [Page 1]
RFC 8145                DNSSEC Key Tag Signaling              April 2017

Copyright Notice

   Copyright (c) 2017 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. Design Evolution ...........................................4
   2. Requirements Terminology ........................................5
   3. Terminology .....................................................5
   4. Using the edns-key-tag Option ...................................5
      4.1. Option Format ..............................................5
      4.2. Use by Queriers ............................................6
           4.2.1. Stub Resolvers ......................................7
                  4.2.1.1. Validating Stub Resolvers ..................7
                  4.2.1.2. Non-validating Stub Resolvers ..............7
           4.2.2. Recursive Resolvers .................................7
                  4.2.2.1. Validating Recursive Resolvers .............7
                  4.2.2.2. Non-validating Recursive Resolvers .........8
      4.3. Use by Responders ..........................................8
   5. Using the Key Tag Query .........................................8
      5.1. Query Format ...............................................8
      5.2. Use by Queriers ............................................9
      5.3. Use by Responders ..........................................9
           5.3.1. Interaction with Aggressive Negative Caching ........9
   6. IANA Considerations ............................................10
   7. Security Considerations ........................................10
   8. Privacy Considerations .........................................11
   9. References .....................................................11
      9.1. Normative References ......................................11
      9.2. Informative References ....................................12
   Acknowledgments ...................................................13
   Authors' Addresses ................................................13

Wessels, et al.              Standards Track                    [Page 2]
RFC 8145                DNSSEC Key Tag Signaling              April 2017

1.  Introduction
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