The DNS-Based Authentication of Named Entities (DANE) Protocol: Updates and Operational Guidance
RFC 7671

Document Type RFC - Proposed Standard (October 2015; No errata)
Updates RFC 6698
Last updated 2015-10-14
Stream IETF
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Stream WG state Submitted to IESG for Publication
Document shepherd Warren Kumari
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IESG IESG state RFC 7671 (Proposed Standard)
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Responsible AD Stephen Farrell
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IANA IANA review state Version Changed - Review Needed
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Internet Engineering Task Force (IETF)                       V. Dukhovni
Request for Comments: 7671                                     Two Sigma
Updates: 6698                                                W. Hardaker
Category: Standards Track                                        Parsons
ISSN: 2070-1721                                             October 2015

    The DNS-Based Authentication of Named Entities (DANE) Protocol:
                    Updates and Operational Guidance

Abstract

   This document clarifies and updates the DNS-Based Authentication of
   Named Entities (DANE) TLSA specification (RFC 6698), based on
   subsequent implementation experience.  It also contains guidance for
   implementers, operators, and protocol developers who want to use DANE
   records.

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/rfc7671.

Copyright Notice

   Copyright (c) 2015 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.

Dukhovni & Hardaker          Standards Track                    [Page 1]
RFC 7671                     DANE Operations                October 2015

Table of Contents

   1. Introduction ....................................................3
      1.1. Terminology ................................................4
   2. DANE TLSA Record Overview .......................................5
      2.1. Example TLSA Record ........................................6
   3. DANE TLS Requirements ...........................................6
   4. DANE Certificate Usage Selection Guidelines .....................7
      4.1. Opportunistic Security and PKIX Usages .....................7
      4.2. Interaction with Certificate Transparency ..................8
      4.3. Switching from/to PKIX-TA/EE to/from DANE-TA/EE ............9
   5. Certificate-Usage-Specific DANE Updates and Guidelines ..........9
      5.1. Certificate Usage DANE-EE(3) ...............................9
      5.2. Certificate Usage DANE-TA(2) ..............................11
      5.3. Certificate Usage PKIX-EE(1) ..............................15
      5.4. Certificate Usage PKIX-TA(0) ..............................15
   6. Service Provider and TLSA Publisher Synchronization ............16
   7. TLSA Base Domain and CNAMEs ....................................18
   8. TLSA Publisher Requirements ....................................19
      8.1. Key Rollover with Fixed TLSA Parameters ...................20
      8.2. Switching to DANE-TA(2) from DANE-EE(3) ...................21
      8.3. Switching to New TLSA Parameters ..........................22
      8.4. TLSA Publisher Requirements: Summary ......................23
   9. Digest Algorithm Agility .......................................23
   10. General DANE Guidelines .......................................25
      10.1. DANE DNS Record Size Guidelines ..........................25
      10.2. Certificate Name Check Conventions .......................26
      10.3. Design Considerations for Protocols Using DANE ...........27
   11. Note on DNSSEC Security .......................................28
   12. Summary of Updates to RFC 6698 ................................29
   13. Operational Considerations ....................................29
   14. Security Considerations .......................................30
   15. References ....................................................30
      15.1. Normative References .....................................30
      15.2. Informative References ...................................32
   Acknowledgements ..................................................33
   Authors' Addresses ................................................33

Dukhovni & Hardaker          Standards Track                    [Page 2]
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