Experimental DMARC Extension For Public Suffix Domains
draft-ietf-dmarc-psd-10
Network Working Group S. Kitterman
Internet-Draft fTLD Registry Services
Intended status: Experimental January 23, 2021
Expires: July 27, 2021
Experimental DMARC Extension For Public Suffix Domains
draft-ietf-dmarc-psd-10
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 July 27, 2021.
Kitterman Expires July 27, 2021 [Page 1]
Internet-Draft PSD DMARC January 2021
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1. Example . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.2. Discussion . . . . . . . . . . . . . . . . . . . . . . . 4
2. Terminology and Definitions . . . . . . . . . . . . . . . . . 5
2.1. Conventions Used in This Document . . . . . . . . . . . . 5
2.2. Public Suffix Domain (PSD) . . . . . . . . . . . . . . . 5
2.3. Organizational Domain . . . . . . . . . . . . . . . . . . 6
2.4. Longest PSD . . . . . . . . . . . . . . . . . . . . . . . 6
2.5. Public Suffix Operator (PSO) . . . . . . . . . . . . . . 6
2.6. PSO Controlled Domain Names . . . . . . . . . . . . . . . 6
2.7. Non-existent Domains . . . . . . . . . . . . . . . . . . 6
3. PSD DMARC Updates to DMARC Requirements . . . . . . . . . . . 6
3.1. General Updates . . . . . . . . . . . . . . . . . . . . . 7
3.2. Changes in Section 6.3 "General Record Format" . . . . . 7
3.3. Changes in Section 6.5 "Domain Owner Actions" . . . . . . 7
3.4. Changes in Section 6.6.1 "Extract Author Domain" . . . . 7
3.5. Changes in Section 6.6.3 "Policy Discovery" . . . . . . . 8
3.6. Changes in Section 7 "DMARC Feedback" . . . . . . . . . . 8
4. Privacy Considerations . . . . . . . . . . . . . . . . . . . 8
4.1. Feedback leakage . . . . . . . . . . . . . . . . . . . . 9
5. Security Considerations . . . . . . . . . . . . . . . . . . . 10
6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 10
6.1. Subdomain Policy Tag . . . . . . . . . . . . . . . . . . 10
7. References . . . . . . . . . . . . . . . . . . . . . . . . . 10
7.1. Normative References . . . . . . . . . . . . . . . . . . 10
7.2. Informative References . . . . . . . . . . . . . . . . . 11
Appendix A. PSD DMARC Privacy Concern Mitigation Experiment . . 12
Appendix B. DMARC PSD Registry Examples . . . . . . . . . . . . 12
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