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IETF RFC 7218



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Internet Engineering Task Force (IETF)                    O. Gudmundsson
Request for Comments: 7218                                 Shinkuro Inc.
Updates: 6698                                                 April 2014
Category: Standards Track 
ISSN: 2070-1721


            Adding Acronyms to Simplify Conversations about
           DNS-Based Authentication of Named Entities (DANE)

 Abstract

   Experience has shown that people get confused when discussing the
   three numeric fields of the TLSA record.  This document specifies
   descriptive acronyms for the three numeric fields in TLSA records.
   This document updates the format of the IANA registry created by RFC
   6698.

 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/RFC 7218.

 Copyright Notice

   Copyright (c) 2014 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.





Gudmundsson                  Standards Track                 PAGE 1 top


RFC 7218 Adding Acronyms to DANE Registries April 2014 Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2 2. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 2 2.1. TLSA Certificate Usages Registry . . . . . . . . . . . . 3 2.2. TLSA Selectors . . . . . . . . . . . . . . . . . . . . . 3 2.3. TLSA Matching Types . . . . . . . . . . . . . . . . . . . 4 3. Examples of Usage . . . . . . . . . . . . . . . . . . . . . . 4 3.1. TLSA Records Using/Displaying the Acronyms . . . . . . . 4 3.2. Acronym Use in a Specification Example . . . . . . . . . 4 4. Security Considerations . . . . . . . . . . . . . . . . . . . 4 5. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 4 6. References . . . . . . . . . . . . . . . . . . . . . . . . . 5 6.1. Normative References . . . . . . . . . . . . . . . . . . 5 6.2. Informative References . . . . . . . . . . . . . . . . . 5 1. Introduction During discussions on how to add DNS-Based Authentication of Named Entities (DANE) [RFC 6698] technology to new protocols and services, people were repeatedly confused as to what the numeric values stood for and even the order of the fields of a TLSA record (note that TLSA is not an acronym but a name). This document updates the IANA registry definition for the TLSA record to add a column containing an acronym for each specified field, in order to reduce confusion. This document does not change the DANE protocol in any way. It is expected that DANE parsers in applications and DNS software can adopt parsing the acronyms for each field. 2. IANA Considerations This document applies to the "DNS-Based Authentication of Named Entities (DANE) Parameters" registry located at <http://www.iana.org/ assignments/dane-parameters>. IANA has added a column with an acronym to each of the sub-registries. [RFC 6698] and this document are the referenced documents for the three sub-registries. As these acronyms are offered for human consumption, case does not matter; it is expected that software that parses TLSA records will handle upper-, mixed-, or lower-case characters as input. Gudmundsson Standards Track PAGE 2 top

RFC 7218 Adding Acronyms to DANE Registries April 2014 2.1. TLSA Certificate Usages Registry The reference for this registry has been updated to include both [RFC 6698] and this document. +-------+----------+--------------------------------+-------------+ | Value | Acronym | Short Description | Reference | +-------+----------+--------------------------------+-------------+ | 0 | PKIX-TA | CA constraint | [RFC 6698] | | 1 | PKIX-EE | Service certificate constraint | [RFC 6698] | | 2 | DANE-TA | Trust anchor assertion | [RFC 6698] | | 3 | DANE-EE | Domain-issued certificate | [RFC 6698] | | 4-254 | | Unassigned | | | 255 | PrivCert | Reserved for Private Use | [RFC 6698] | +-------+----------+--------------------------------+-------------+ Table 1: TLSA Certificate Usages 2.2. TLSA Selectors The reference for this registry has been updated to include both [RFC 6698] and this document. +-------+---------+--------------------------+-------------+ | Value | Acronym | Short Description | Reference | +-------+---------+--------------------------+-------------+ | 0 | Cert | Full certificate | [RFC 6698] | | 1 | SPKI | SubjectPublicKeyInfo | [RFC 6698] | | 2-254 | | Unassigned | | | 255 | PrivSel | Reserved for Private Use | [RFC 6698] | +-------+---------+--------------------------+-------------+ Table 2: TLSA Selectors Gudmundsson Standards Track PAGE 3 top

RFC 7218 Adding Acronyms to DANE Registries April 2014 2.3. TLSA Matching Types The reference for this registry has been updated to include both [RFC 6698] and this document. +-------+-----------+--------------------------+-------------+ | Value | Acronym | Short Description | Reference | +-------+-----------+--------------------------+-------------+ | 0 | Full | No hash used | [RFC 6698] | | 1 | SHA2-256 | 256 bit hash by SHA2 | [RFC 6234] | | 2 | SHA2-512 | 512 bit hash by SHA2 | [RFC 6234] | | 3-254 | | Unassigned | | | 255 | PrivMatch | Reserved for Private Use | [RFC 6698] | +-------+-----------+--------------------------+-------------+ Table 3: TLSA Matching Types 3. Examples of Usage Two examples are described below. 3.1. TLSA Records Using/Displaying the Acronyms _666._tcp.first.example. TLSA PKIX-TA CERT SHA2-512 {blob} _666._tcp.second.example. TLSA DANE-TA SPKI SHA2-256 {blob} 3.2. Acronym Use in a Specification Example Protocol FOO only allows TLSA records using PKIX-EE and DANE-EE, with selector SPKI, and using SHA2-512. 4. Security Considerations This document only changes registry fields and does not change the behavior of any protocol. The hope is to reduce confusion, which would lead to better specification and operations. 5. Acknowledgements Scott Schmit offered really good suggestions to decrease the possibility of confusion. Viktor Dukhovni provided comments from the expert point of view. Jim Schaad, Wes Hardaker, and Paul Hoffman provided feedback during WGLC. Dan Romascanu and Tobias Gondrom pointed out a few defects during the IESG last call. Gudmundsson Standards Track PAGE 4 top

RFC 7218 Adding Acronyms to DANE Registries April 2014 6. References 6.1. Normative References [RFC 6698] Hoffman, P. and J. Schlyter, "The DNS-Based Authentication of Named Entities (DANE) Transport Layer Security (TLS) Protocol: TLSA", RFC 6698, August 2012. 6.2. Informative References [RFC 6234] Eastlake, D. and T. Hansen, "US Secure Hash Algorithms (SHA and SHA-based HMAC and HKDF)", RFC 6234, May 2011. Author's Address Olafur Gudmundsson Shinkuro Inc. 4922 Fairmont Av, Suite 250 Bethesda, MD 20814 USA EMail: ogud@ogud.com Gudmundsson Standards Track PAGE 5 top

RFC TOTAL SIZE: 8907 bytes PUBLICATION DATE: Tuesday, April 22nd, 2014 LEGAL RIGHTS: The IETF Trust (see BCP 78)


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