DMARC (Domain-based Message Authentication, Reporting, and Conformance) Extension For PSDs (Public Suffix Domains)
draft-ietf-dmarc-psd-03

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Network Working Group                                       S. Kitterman
Internet-Draft                                    fTLD Registry Services
Intended status: Experimental                                May 7, 2019
Expires: November 8, 2019

DMARC (Domain-based Message Authentication, Reporting, and Conformance)
               Extension For PSDs (Public Suffix Domains)
                        draft-ietf-dmarc-psd-03

Abstract

   DMARC (Domain-based Message Authentication, Reporting, and
   Conformance) is a scalable mechanism by which a mail-originating
   organization can express domain-level policies and preferences for
   message validation, disposition, and reporting, that a mail-receiving
   organization can use to improve mail handling.  DMARC policies can be
   applied at the individual domain level or for a set of domains at the
   organizational level.  The design of DMARC precludes grouping
   policies for a set of domains above the organizational level, such as
   TLDs (Top Level Domains).  These types of domains (which are not all
   at the top level of the DNS tree) can be collectively referred to as
   Public Suffix Domains (PSDs).  For the subset of PSDs that require
   DMARC usage, this memo describes an extension to DMARC to enable
   DMARC functionality for such domains.

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
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   This Internet-Draft will expire on November 8, 2019.

Copyright Notice

   Copyright (c) 2019 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Kitterman               Expires November 8, 2019                [Page 1]
Internet-Draft                  PSD DMARC                       May 2019

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology and Definitions . . . . . . . . . . . . . . . . .   4
     2.1.  Conventions Used in This Document . . . . . . . . . . . .   4
     2.2.  Public Suffix Domain (PSD)  . . . . . . . . . . . . . . .   4
     2.3.  Longest PSD . . . . . . . . . . . . . . . . . . . . . . .   5
     2.4.  Public Suffix Operator (PSO)  . . . . . . . . . . . . . .   5
     2.5.  PSO Controlled Domain Names . . . . . . . . . . . . . . .   5
     2.6.  Non-existent Domains  . . . . . . . . . . . . . . . . . .   5
   3.  PSD DMARC Updates to DMARC Requirements . . . . . . . . . . .   5
     3.1.  General Updates . . . . . . . . . . . . . . . . . . . . .   5
     3.2.  Section 6.1 DMARC Policy Record . . . . . . . . . . . . .   5
     3.3.  Section 6.5.  Domain Owner Actions  . . . . . . . . . . .   5
     3.4.  Section 6.6.3.  Policy Discovery  . . . . . . . . . . . .   6
     3.5.  Section 7.  DMARC Feedback  . . . . . . . . . . . . . . .   6
   4.  Privacy Considerations  . . . . . . . . . . . . . . . . . . .   6
     4.1.  Feedback leakage  . . . . . . . . . . . . . . . . . . . .   6
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   7
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   8
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   8
     7.1.  Normative References  . . . . . . . . . . . . . . . . . .   8
     7.2.  Informative References  . . . . . . . . . . . . . . . . .   8
   Appendix A.  The Experiment . . . . . . . . . . . . . . . . . . .   9
   Appendix B.  DMARC PSD Registry Examples  . . . . . . . . . . . .  10
     B.1.  DMARC PSD DNS Query Service . . . . . . . . . . . . . . .  10
     B.2.  DMARC Public Suffix Domain (PSD) Registry . . . . . . . .  10
   Appendix C.  Implementation . . . . . . . . . . . . . . . . . . .  11
     C.1.  Authheaders Module  . . . . . . . . . . . . . . . . . . .  11
   Acknowledgements  . . . . . . . . . . . . . . . . . . . . . . . .  11
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .  11