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Versions: 00 01 02 03 04 RFC 7218

DANE                                                      O. Gudmundsson
Internet-Draft                                             Shinkuro Inc.
Updates: 6698 (if approved)                            December 01, 2013
Intended status: Standards Track
Expires: June 04, 2014


             Adding acronyms to simplify DANE conversations
                  draft-ietf-dane-registry-acronyms-02

Abstract

   Experience has show that people get confused using the three numeric
   fields the TLSA record.  This document specifies descriptive acronyms
   for the three numeric fields in the TLSA records.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF).  Note that other groups may also distribute
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   Internet-Drafts are draft documents valid for a maximum of six months
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   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on June 04, 2014.

Copyright Notice

   Copyright (c) 2013 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
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   described in the Simplified BSD License.




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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  IANA considerations . . . . . . . . . . . . . . . . . . . . .   2
     2.1.  TLSA Certificate Usages . . . . . . . . . . . . . . . . .   3
     2.2.  TLSA Selectors  . . . . . . . . . . . . . . . . . . . . .   3
     2.3.  TLSA Matching types . . . . . . . . . . . . . . . . . . .   3
   3.  Examples of usage . . . . . . . . . . . . . . . . . . . . . .   3
     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.  Normative References  . . . . . . . . . . . . . . . . . . . .   4
   Appendix A.  Document history . . . . . . . . . . . . . . . . . .   4
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .   5

1.  Introduction

   During discussions on how to add DANE [RFC6698] technology to new
   protocols/services people repeatedly have got confused as what the
   numeric values stand for and even the order of the fields of a TLSA
   record.  This document updates the IANA registry definition for TLSA
   record to add a column with 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 "DNS-Based Authentication of Named Entities
   (DANE) Parameters" located at "http://www.iana.org/assignments/dane-
   parameters/dane-parameters.xhtml".  Each one of the Sub-registries
   will add a column with an acronym for that field.

   [RFC6698] and this document are both to be the reference 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 either upper or lower case use as input.









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2.1.  TLSA Certificate Usages

    +-------+----------+--------------------------------+-------------+
    | Value | Acronym  | Short Description              | Reference   |
    +-------+----------+--------------------------------+-------------+
    |   0   | PKIX-TA  | CA constraint                  | [RFC6698]   |
    |   1   | PKIX-EE  | Service certificate constraint | [RFC6698]   |
    |   2   | DANE-TA  | Trust anchor assertion         | [RFC6698]   |
    |   3   | DANE-EE  | Domain-issued certificate      | [RFC6698]   |
    | 4-254 |          | Unassigned                     |             |
    |  255  | PrivCert | Reserved for Private Use       | [RFC6698]   |
    +-------+----------+--------------------------------+-------------+

                     Table 1: TLSA Certificate Usages

   Other options suggested for 0: PKIX-TA

2.2.  TLSA Selectors

       +-------+---------+--------------------------+-------------+
       | Value | Acronym | Short Description        | Reference   |
       +-------+---------+--------------------------+-------------+
       |   0   | Cert    | Full certificate         | [RFC6698]   |
       |   1   | SPKI    | SubjectPublicKeyInfo     | [RFC6698]   |
       | 2-254 |         | Unassigned               |             |
       |  255  | PrivSel | Reserved for Private Use | [RFC6698]   |
       +-------+---------+--------------------------+-------------+

                          Table 2: TLSA Selectors

2.3.  TLSA Matching types

      +-------+-----------+--------------------------+-------------+
      | Value | Acronym   | Short Description        | Reference   |
      +-------+-----------+--------------------------+-------------+
      |   0   | Full      | No hash used             | [RFC6698]   |
      |   1   | SHA2-256  | 256 bit hash by SHA2     | [RFC6698]   |
      |   2   | SHA2-512  | 512 bit hash by SHA2     | [RFC6698]   |
      | 3-254 |           | Unassigned               |             |
      |  255  | PrivMatch | Reserved for Private Use | [RFC6698]   |
      +-------+-----------+--------------------------+-------------+

                       Table 3: TLSA Matching types

3.  Examples of usage

   Two examples below




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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 and lead
   to better specification and operations.

5.  Acknowledgements

   Scott Schmit offered real good suggestions to decrease the
   possibility of confusion.  Viktor Dukhovni provided comments from
   expert point of view.  Jim Schaad, Wes Hardaker and Paul Hoffman
   provided feedback during WGLC.

6.  Normative References

   [RFC6698]  Hoffman, P. and J. Schlyter, "The DNS-Based Authentication
              of Named Entities (DANE) Transport Layer Security (TLS)
              Protocol: TLSA", RFC 6698, August 2012.

Appendix A.  Document history

   [RFC Editor: Please remove this section before publication ]

   00 Initial version

   01 Updated version based on some comments ready for WGLC

   00 WG version almost identical to 01

   01 WG version result of WG last call one possible issue remains PKIX-
   CA ==> PKIX-TA no clear message if that change should be made

   02 WG version PKIX-CA ==> PKIX-TA









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Author's Address

   Olafur Gudmundsson
   Shinkuro Inc.
   4922 Fairmont Av, Suite 250
   Bethesda, MD  20814
   USA

   Email: ogud@ogud.com










































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