DMARC (Domain-based Message Authentication, Reporting, and Conformance) Extension For PSDs (Public Suffix Domains)
draft-ietf-dmarc-psd-06

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Network Working Group                                       S. Kitterman
Internet-Draft                                    fTLD Registry Services
Intended status: Experimental                            August 10, 2019
Expires: February 11, 2020

DMARC (Domain-based Message Authentication, Reporting, and Conformance)
               Extension For PSDs (Public Suffix Domains)
                        draft-ietf-dmarc-psd-06

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.  The design of DMARC
   presumes that domain names represent either nodes in the tree below
   which registrations occur, or nodes where registrations have
   occurred; it does not permit a domain name to have both of these
   properties simultaneously.  Since its deployment in 2015, use of
   DMARC has shown a clear need for the ability to express policy for
   these domains as well.

   Domains at which registrations can occur are referred to as Public
   Suffix Domains (PSDs).  This document describes an extension to DMARC
   to enable DMARC functionality for PSDs.

   This document also seeks to address implementations that consider a
   domain on a public Suffix list to be ineligible for DMARC
   enforcement.

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
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at https://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   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 February 11, 2020.

Kitterman               Expires February 11, 2020               [Page 1]
Internet-Draft                  PSD DMARC                    August 2019

Copyright Notice

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   document authors.  All rights reserved.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Terminology and Definitions . . . . . . . . . . . . . . . . .   5
     2.1.  Conventions Used in This Document . . . . . . . . . . . .   5
     2.2.  Public Suffix Domain (PSD)  . . . . . . . . . . . . . . .   5
     2.3.  Longest PSD . . . . . . . . . . . . . . . . . . . . . . .   5
     2.4.  Public Suffix Operator (PSO)  . . . . . . . . . . . . . .   5
     2.5.  PSO Controlled Domain Names . . . . . . . . . . . . . . .   6
     2.6.  Non-existent Domains  . . . . . . . . . . . . . . . . . .   6
   3.  PSD DMARC Updates to DMARC Requirements . . . . . . . . . . .   6
     3.1.  General Updates . . . . . . . . . . . . . . . . . . . . .   6
     3.2.  Section 6.3 General Record Format . . . . . . . . . . . .   6
     3.3.  Section 6.5.  Domain Owner Actions  . . . . . . . . . . .   7
     3.4.  Section 6.6.1.  Extract Author Domain . . . . . . . . . .   7
     3.5.  Section 6.6.3.  Policy Discovery  . . . . . . . . . . . .   7
     3.6.  Section 7.  DMARC Feedback  . . . . . . . . . . . . . . .   8
   4.  Privacy Considerations  . . . . . . . . . . . . . . . . . . .   8
     4.1.  Feedback leakage  . . . . . . . . . . . . . . . . . . . .   8
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   9
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   9
     6.1.  Subdomain Policy Tag  . . . . . . . . . . . . . . . . . .   9
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  10
     7.1.  Normative References  . . . . . . . . . . . . . . . . . .  10
     7.2.  Informative References  . . . . . . . . . . . . . . . . .  10
   Appendix A.  The Experiment . . . . . . . . . . . . . . . . . . .  11
     A.1.  PSD DMARC Privacy Concern Mitigation  . . . . . . . . . .  11
     A.2.  Non-Existent Subdomain Policy . . . . . . . . . . . . . .  12
   Appendix B.  DMARC PSD Registry Examples  . . . . . . . . . . . .  12