Using DNS-Based Authentication of Named Entities (DANE) TLSA Records with SRV Records
RFC 7673

Document Type RFC - Proposed Standard (October 2015; No errata)
Last updated 2015-10-14
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Stream WG state Submitted to IESG for Publication
Document shepherd Ólafur Guðmundsson
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IESG IESG state RFC 7673 (Proposed Standard)
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Responsible AD Stephen Farrell
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IANA IANA review state Version Changed - Review Needed
IANA action state No IC
Internet Engineering Task Force (IETF)                          T. Finch
Request for Comments: 7673                       University of Cambridge
Category: Standards Track                                      M. Miller
ISSN: 2070-1721                                      Cisco Systems, Inc.
                                                          P. Saint-Andre
                                                                    &yet
                                                            October 2015

        Using DNS-Based Authentication of Named Entities (DANE)
                     TLSA Records with SRV Records

Abstract

   The DNS-Based Authentication of Named Entities (DANE) specification
   (RFC 6698) describes how to use TLSA resource records secured by
   DNSSEC (RFC 4033) to associate a server's connection endpoint with
   its Transport Layer Security (TLS) certificate (thus enabling
   administrators of domain names to specify the keys used in that
   domain's TLS servers).  However, application protocols that use SRV
   records (RFC 2782) to indirectly name the target server connection
   endpoints for a service domain name cannot apply the rules from RFC
   6698.  Therefore, this document provides guidelines that enable such
   protocols to locate and use TLSA 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/rfc7673.

Finch, et al.                Standards Track                    [Page 1]
RFC 7673                      TLSA and SRV                  October 2015

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.

Table of Contents

   1. Introduction ....................................................3
   2. Terminology .....................................................4
   3. DNS Checks ......................................................4
      3.1. SRV Query ..................................................4
      3.2. Address Queries ............................................5
      3.3. TLSA Queries ...............................................6
      3.4. Impact on TLS Usage ........................................6
   4. TLS Checks ......................................................7
      4.1. SRV Records Only ...........................................7
      4.2. TLSA Records ...............................................8
   5. Guidance for Protocol Authors ...................................8
   6. Guidance for Server Operators ...................................8
   7. Guidance for Application Developers .............................9
   8. Internationalization Considerations .............................9
   9. Security Considerations ........................................10
      9.1. Mixed Security Status .....................................10
      9.2. Certificate Subject Name Matching .........................10
   10. References ....................................................11
      10.1. Normative References .....................................11
      10.2. Informative References ...................................12
   Appendix A. Examples ..............................................13
     A.1. IMAP .......................................................13
     A.2. XMPP .......................................................13
   Appendix B. Rationale .............................................14
   Acknowledgements ..................................................15
   Authors' Addresses ................................................16

Finch, et al.                Standards Track                    [Page 2]
RFC 7673                      TLSA and SRV                  October 2015
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