DMARC (Domain-based Message Authentication, Reporting, and Conformance) Extension For PSDs (Public Suffix Domains)
draft-ietf-dmarc-psd-08
Network Working Group S. Kitterman
Internet-Draft fTLD Registry Services
Intended status: Experimental March 12, 2020
Expires: September 13, 2020
DMARC (Domain-based Message Authentication, Reporting, and Conformance)
Extension For PSDs (Public Suffix Domains)
draft-ietf-dmarc-psd-08
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 September 13, 2020.
Kitterman Expires September 13, 2020 [Page 1]
Internet-Draft PSD DMARC March 2020
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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. Organizational Domain . . . . . . . . . . . . . . . . . . 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 . . . . . . . . . . . . . . . . . . . . . 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 . . . . . . . . . . . . . . . . . . 10
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 . . . . . . . . . . 12
A.2. Non-Existent Subdomain Policy . . . . . . . . . . . . . . 12
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