Updates to and Operational Guidance for the DANE Protocol
draft-ietf-dane-ops-05

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DANE                                                         V. Dukhovni
Internet-Draft                                              Unaffiliated
Intended status: Standards Track                             W. Hardaker
Expires: January 04, 2015                                        Parsons
                                                           July 03, 2014

       Updates to and Operational Guidance for the DANE Protocol
                         draft-ietf-dane-ops-05

Abstract

   This memo clarifies and updates the DANE TLSA protocol based on
   implementation experience since the publication of the original DANE
   specification in [RFC6698].  It also contains guidance for DANE
   implementers and operators.

Status of This Memo

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   provisions of BCP 78 and BCP 79.

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   This Internet-Draft will expire on January 04, 2015.

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   Copyright (c) 2014 IETF Trust and the persons identified as the
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Dukhovni & Hardaker     Expires January 04, 2015                [Page 1]
Internet-Draft               DANE operations                   July 2014

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  DANE TLSA Record Overview . . . . . . . . . . . . . . . . . .   4
     2.1.  Example TLSA record . . . . . . . . . . . . . . . . . . .   6
   3.  DANE TLS Requirements . . . . . . . . . . . . . . . . . . . .   6
   4.  Certificate-Usage-Specific DANE Updates and Guidelines  . . .   6
     4.1.  Certificate Usage DANE-EE(3)  . . . . . . . . . . . . . .   6
     4.2.  Certificate Usage DANE-TA(2)  . . . . . . . . . . . . . .   8
     4.3.  Certificate Usage PKIX-EE(1)  . . . . . . . . . . . . . .  11
     4.4.  Certificate Usage PKIX-TA(0)  . . . . . . . . . . . . . .  11
   5.  Service Provider and TLSA Publisher Synchronization . . . . .  12
   6.  TLSA Base Domain and CNAMEs . . . . . . . . . . . . . . . . .  15
   7.  TLSA Publisher Requirements . . . . . . . . . . . . . . . . .  15
     7.1.  Rolling a Key Without Changing TLSA Parameters  . . . . .  16
     7.2.  Switching to DANE-CA from DANE-EE . . . . . . . . . . . .  17
     7.3.  Switching to New TLSA Parameters  . . . . . . . . . . . .  17
     7.4.  TLSA Publisher Requirements Summary . . . . . . . . . . .  18
   8.  Digest Algorithm Agility  . . . . . . . . . . . . . . . . . .  18
   9.  General DANE Guidelines . . . . . . . . . . . . . . . . . . .  19
     9.1.  DANE DNS Record Size Guidelines . . . . . . . . . . . . .  19
     9.2.  Certificate Name Check Conventions  . . . . . . . . . . .  20
     9.3.  Design Considerations for Protocols Using DANE  . . . . .  21
   10. Interaction with Certificate Transparency . . . . . . . . . .  22
   11. Note on DNSSEC Security . . . . . . . . . . . . . . . . . . .  23
   12. Summary of Updates to RFC6698 . . . . . . . . . . . . . . . .  24
   13. Security Considerations . . . . . . . . . . . . . . . . . . .  25
   14. IANA Considerations . . . . . . . . . . . . . . . . . . . . .  25
   15. Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  25
   16. References  . . . . . . . . . . . . . . . . . . . . . . . . .  25
     16.1.  Normative References . . . . . . . . . . . . . . . . . .  25
     16.2.  Informative References . . . . . . . . . . . . . . . . .  26
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  27

1.  Introduction

   [RFC6698] specifies a new DNS resource record "TLSA" that associates
   a public certificate or public key of a trusted leaf or issuing
   authority with the corresponding TLS transport endpoint.  These DANE
   TLSA records, when validated by DNSSEC, can be used to augment or
   replace the trust model of the existing public Certification
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