Re: [dmarc-ietf] Add MLS/MLM subscription/submissions controls to DMARCbis
Alessandro Vesely <vesely@tana.it> Mon, 01 May 2023 10:52 UTC
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Original-Subject: Re: [dmarc-ietf] Add MLS/MLM subscription/submissions controls to DMARCbis
Author: Alessandro Vesely <vesely@tana.it>
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Date: Mon, 01 May 2023 12:51:53 +0200
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From: Alessandro Vesely <vesely@tana.it>
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Subject: Re: [dmarc-ietf] Add MLS/MLM subscription/submissions controls to DMARCbis
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On Mon 01/May/2023 04:25:17 +0200 Emanuel Schorsch wrote: > I want to ask about the "hollow victory" aspect and what would turn it into a > more meaningful victory. If fromHeader rewriting is the damage we want to avoid > it seems there's two options: > 1) Have the mailingList make a decision based on what they know about the > evaluator. This would need some mechanism for evaluators to indicate what trust > techniques they accept. Can do better than that. Have evaluators indicate under what conditions they accept whitelisting agreements. If the MLM can meet such conditions they set up whitelisting, for a specific recipient, of messages signed by the mailing list, even if they break DMARC (see below). However, this cannot be part of DMARCbis. > 2) Have the mailingList rewrite the fromHeader but store the original > fromHeader and propagate the necessary trust information so that downstream > evaluators can undo the rewriting. > > Given that currently many mailingList do fromHeader rewriting it seems that #2 > would allow gradual adoption and flexibility for experimentation over time to > see what trust methods work and allow downstream evaluators to make > personalized decisions depending on the recipients trust preferences. Been there, done that. For the message I'm replying to, I have: Authentication-Results: wmail.tana.it; spf=pass smtp.mailfrom=ietf.org; dkim=pass reason="Original-From: transformed" header.d=google.com; dkim=pass (whitelisted) header.d=ietf.org header.b=jAsjjtsp (ietf1); dkim=fail (signature verification failed, whitelisted) header.d=ietf.org header.b=QuwLQGvz (ietf1) However, not all signatures can be verified. Mailman tries and preserve most header fields, but not all. For example, they rewrite MIME-Version: from scratch and don't save the old one. So if a poster signs that field and writes it differently (e.g. with a comment) MLM transformation cannot be undone. https://datatracker.ietf.org/doc/html/draft-vesely-dmarc-mlm-transform > What are your thoughts? What would be needed for that to result in a non-hollow > victory? I'll propose another draft, here or in the ART WG, more or less like so: * The mailing list sends a message to the subscriber domain requesting permission to send mailing list messages that may fail DMARC checks. * The message explains that list messages will be properly authenticated using ARC, but may fail DMARC alignment checks because they are being forwarded by the mailing list server. * The subscriber domain verifies the request with the subscriber and, if the subscriber agrees to receive mailing list messages, provides a DMARC override specific for the mailing list server's domain and the recipient. * The DMARC override allows mailing list messages to bypass DMARC checks and be delivered to the subscriber's inbox, so the mailing list won't rewrite From: in messages to that subscriber. Additionally, it may be helpful to provide regular reports or updates to the domain's IT team, detailing any issues or incidents related to the mailing list's email traffic. This can help establish a sense of trust and accountability between the mailing list operator and the domain, and demonstrate that the mailing list is actively monitoring and addressing any potential security concerns. That has to be discussed, but not in the DMARCbis context, otherwise someone will say it's mission creeping, someone else will escalate it to mission gallop, an they'd be somewhat right that such discussion delays DMARCbis publication. IOW, let's proceed step by step. Best Ale --
- [dmarc-ietf] Proposed text for p=reject and indir… Barry Leiba
- Re: [dmarc-ietf] Proposed text for p=reject and i… Jim Fenton
- Re: [dmarc-ietf] Proposed text for p=reject and i… Todd Herr
- Re: [dmarc-ietf] Proposed text for p=reject and i… Mark Alley
- [dmarc-ietf] DMARCbis and M3AAWG Email Auth BCP (… Todd Herr
- Re: [dmarc-ietf] Proposed text for p=reject and i… Todd Herr
- Re: [dmarc-ietf] Proposed text for p=reject and i… Scott Kitterman
- Re: [dmarc-ietf] Proposed text for p=reject and i… Brotman, Alex
- Re: [dmarc-ietf] Proposed text for p=reject and i… Dotzero
- Re: [dmarc-ietf] Proposed text for p=reject and i… Scott Kitterman
- Re: [dmarc-ietf] Proposed text for p=reject and i… Scott Kitterman
- Re: [dmarc-ietf] Proposed text for p=reject and i… Todd Herr
- Re: [dmarc-ietf] Proposed text for p=reject and i… Scott Kitterman
- Re: [dmarc-ietf] Proposed text for p=reject and i… Todd Herr
- Re: [dmarc-ietf] Proposed text for p=reject and i… Brotman, Alex
- Re: [dmarc-ietf] Proposed text for p=reject and i… Scott Kitterman
- Re: [dmarc-ietf] Proposed text for p=reject and i… Scott Kitterman
- Re: [dmarc-ietf] Proposed text for p=reject and i… Pete Resnick
- Re: [dmarc-ietf] Proposed text for p=reject and i… Douglas Foster
- Re: [dmarc-ietf] Proposed text for p=reject and i… John Levine
- Re: [dmarc-ietf] Proposed text for p=reject and i… Scott Kitterman
- Re: [dmarc-ietf] Proposed text for p=reject and i… Alessandro Vesely
- Re: [dmarc-ietf] Proposed text for p=reject and i… Douglas Foster
- Re: [dmarc-ietf] Proposed text for p=reject and i… Murray S. Kucherawy
- Re: [dmarc-ietf] Proposed text for p=reject and i… Murray S. Kucherawy
- Re: [dmarc-ietf] Proposed text for p=reject and i… Todd Herr
- Re: [dmarc-ietf] Proposed text for p=reject and i… Barry Leiba
- Re: [dmarc-ietf] Proposed text for p=reject and i… Brotman, Alex
- Re: [dmarc-ietf] Proposed text for p=reject and i… Todd Herr
- Re: [dmarc-ietf] Proposed text for p=reject and i… Alessandro Vesely
- Re: [dmarc-ietf] Proposed text for p=reject and i… Douglas Foster
- Re: [dmarc-ietf] Proposed text for p=reject and i… Scott Kitterman
- Re: [dmarc-ietf] Proposed text for p=reject and i… Douglas Foster
- Re: [dmarc-ietf] Proposed text for p=reject and i… Mark Alley
- Re: [dmarc-ietf] Proposed text for p=reject and i… Barry Leiba
- Re: [dmarc-ietf] Proposed text for p=reject and i… Barry Leiba
- Re: [dmarc-ietf] Proposed text for p=reject and i… Murray S. Kucherawy
- Re: [dmarc-ietf] Proposed text for p=reject and i… John Levine
- Re: [dmarc-ietf] Proposed text for p=reject and i… Douglas Foster
- Re: [dmarc-ietf] Proposed text for p=reject and i… Barry Leiba
- Re: [dmarc-ietf] Proposed text for p=reject and i… Pete Resnick
- Re: [dmarc-ietf] Proposed text for p=reject and i… Douglas Foster
- Re: [dmarc-ietf] Proposed text for p=reject and i… Alessandro Vesely
- Re: [dmarc-ietf] Proposed text for p=reject and i… Alessandro Vesely
- Re: [dmarc-ietf] Proposed text for p=reject and i… Murray S. Kucherawy
- Re: [dmarc-ietf] Proposed text for p=reject and i… Murray S. Kucherawy
- Re: [dmarc-ietf] Proposed text for p=reject and i… Douglas Foster
- Re: [dmarc-ietf] Proposed text for p=reject and i… Murray S. Kucherawy
- Re: [dmarc-ietf] Proposed text for p=reject and i… Alessandro Vesely
- Re: [dmarc-ietf] Proposed text for p=reject and i… Dotzero
- Re: [dmarc-ietf] Proposed text for p=reject and i… Scott Kitterman
- Re: [dmarc-ietf] Proposed text for p=reject and i… Alessandro Vesely
- Re: [dmarc-ietf] Proposed text for p=reject and i… Scott Kitterman
- Re: [dmarc-ietf] THIS IS ABUSE (no it's not) Scott Kitterman
- Re: [dmarc-ietf] Understanding Ale's Abuse resear… Douglas Foster
- Re: [dmarc-ietf] THIS IS ABUSE (it might be) Alessandro Vesely
- Re: [dmarc-ietf] THIS IS ABUSE (it might be) Scott Kitterman
- Re: [dmarc-ietf] Proposed text for p=reject and i… Mark Alley
- Re: [dmarc-ietf] THIS IS ABUSE (it might be) Eric D. Williams
- Re: [dmarc-ietf] THIS IS ABUSE (it might be) Douglas Foster
- Re: [dmarc-ietf] Proposed text for p=reject and i… John Levine
- Re: [dmarc-ietf] THIS IS ABUSE (it might be) Alessandro Vesely
- Re: [dmarc-ietf] THIS IS ABUSE (it might be) Scott Kitterman
- Re: [dmarc-ietf] THIS IS ABUSE (it might be) John Levine
- Re: [dmarc-ietf] THIS IS A DISTRACTION (it might … John Levine
- Re: [dmarc-ietf] THIS IS A DISTRACTION (it might … Scott Kitterman
- Re: [dmarc-ietf] THIS IS A DISTRACTION (it might … Alessandro Vesely
- Re: [dmarc-ietf] Proposed text for p=reject and i… Scott Kitterman
- Re: [dmarc-ietf] Proposed text for p=reject and i… Dotzero
- Re: [dmarc-ietf] Proposed text for p=reject and i… Scott Kitterman
- Re: [dmarc-ietf] Proposed text for p=reject and i… Mark Alley
- Re: [dmarc-ietf] Proposed text for p=reject and i… Douglas Foster
- Re: [dmarc-ietf] Proposed text for p=reject and i… Dotzero
- Re: [dmarc-ietf] Proposed text for p=reject and i… Scott Kitterman
- Re: [dmarc-ietf] Proposed text for p=reject and i… Neil Anuskiewicz
- Re: [dmarc-ietf] Proposed text for p=reject and i… Murray S. Kucherawy
- Re: [dmarc-ietf] Proposed text for p=reject and i… Matthäus Wander
- Re: [dmarc-ietf] Proposed text for p=reject and i… Jesse Thompson
- Re: [dmarc-ietf] Proposed text for p=reject and i… John Levine
- Re: [dmarc-ietf] Proposed text for p=reject and i… Scott Kitterman
- Re: [dmarc-ietf] Proposed text for p=reject and i… Scott Kitterman
- Re: [dmarc-ietf] Proposed text for p=reject and i… Murray S. Kucherawy
- Re: [dmarc-ietf] Proposed text for p=reject and i… Hector Santos
- Re: [dmarc-ietf] Proposed text for p=reject and i… Barry Leiba
- Re: [dmarc-ietf] Proposed text for p=reject and i… Hector Santos
- Re: [dmarc-ietf] Proposed text for p=reject and i… Douglas Foster
- Re: [dmarc-ietf] Proposed text for p=reject and i… Neil Anuskiewicz
- Re: [dmarc-ietf] Proposed text for p=reject and i… Scott Kitterman
- Re: [dmarc-ietf] Proposed text for p=reject and i… Matthäus Wander
- Re: [dmarc-ietf] Proposed text for p=reject and i… Alessandro Vesely
- Re: [dmarc-ietf] THIS IS ABUSE (it might be) Alessandro Vesely
- Re: [dmarc-ietf] THIS IS ABUSE (it might be) John R Levine
- Re: [dmarc-ietf] Proposed text for p=reject and i… Mark Alley
- Re: [dmarc-ietf] Proposed text for p=reject and i… Alessandro Vesely
- Re: [dmarc-ietf] Proposed text for p=reject and i… Alessandro Vesely
- Re: [dmarc-ietf] Proposed text for p=reject and i… Laura Atkins
- Re: [dmarc-ietf] Proposed text for p=reject and i… Douglas Foster
- Re: [dmarc-ietf] Proposed text for p=reject and i… Douglas Foster
- Re: [dmarc-ietf] Proposed text for p=reject and i… Laura Atkins
- Re: [dmarc-ietf] THIS IS ABUSE (it might be) Eric D. Williams
- Re: [dmarc-ietf] THIS IS ABUSE (it might be) John R Levine
- Re: [dmarc-ietf] Proposed text for p=reject and i… Alessandro Vesely
- Re: [dmarc-ietf] Proposed text for p=reject and i… Scott Kitterman
- Re: [dmarc-ietf] Proposed text for p=reject and i… Laura Atkins
- Re: [dmarc-ietf] Proposed text for p=reject and i… Dotzero
- Re: [dmarc-ietf] Proposed text for p=reject and i… John Levine
- Re: [dmarc-ietf] Proposed text for p=reject and i… Dotzero
- Re: [dmarc-ietf] Proposed text for p=reject and i… Murray S. Kucherawy
- Re: [dmarc-ietf] Proposed text for p=reject and i… Douglas Foster
- Re: [dmarc-ietf] Proposed text for p=reject and i… Murray S. Kucherawy
- Re: [dmarc-ietf] Proposed text for p=reject and i… Emanuel Schorsch
- Re: [dmarc-ietf] Proposed text for p=reject and i… Dotzero
- Re: [dmarc-ietf] Proposed text for p=reject and i… Scott Kitterman
- Re: [dmarc-ietf] Proposed text for p=reject and i… Mark Alley
- Re: [dmarc-ietf] Proposed text for p=reject and i… Laura Atkins
- Re: [dmarc-ietf] Proposed text for p=reject and i… Wei Chuang
- Re: [dmarc-ietf] Proposed text for p=reject and i… Alessandro Vesely
- Re: [dmarc-ietf] Proposed text for p=reject and i… Jim Fenton
- Re: [dmarc-ietf] Proposed text for p=reject and i… Jim Fenton
- Re: [dmarc-ietf] Proposed text for p=reject and i… Mark Alley
- Re: [dmarc-ietf] Proposed text for p=reject and i… Scott Kitterman
- Re: [dmarc-ietf] Proposed text for p=reject and i… Scott Kitterman
- [dmarc-ietf] Search for some consensus, was: Prop… Scott Kitterman
- Re: [dmarc-ietf] Search for some consensus, was: … John Levine
- Re: [dmarc-ietf] Search for some consensus, was: … Hector Santos
- Re: [dmarc-ietf] Search for some consensus, was: … Scott Kitterman
- Re: [dmarc-ietf] Search for some consensus, was: … Jesse Thompson
- Re: [dmarc-ietf] Search for some consensus, was: … Hector Santos
- Re: [dmarc-ietf] Search for some consensus, was: … Scott Kitterman
- Re: [dmarc-ietf] Search for some consensus, was: … Scott Kitterman
- Re: [dmarc-ietf] Search for some consensus, was: … Alessandro Vesely
- Re: [dmarc-ietf] Search for some consensus, was: … Scott Kitterman
- Re: [dmarc-ietf] Search for some consensus, was: … Hector Santos
- Re: [dmarc-ietf] Search for some consensus, was: … Scott Kitterman
- Re: [dmarc-ietf] Search for some consensus, was: … John Levine
- Re: [dmarc-ietf] Search for some consensus, was: … Jesse Thompson
- Re: [dmarc-ietf] Search for some consensus, was: … Jesse Thompson
- Re: [dmarc-ietf] Search for some consensus, was: … Scott Kitterman
- Re: [dmarc-ietf] Search for some consensus, was: … Scott Kitterman
- Re: [dmarc-ietf] Search for some consensus, was: … Jesse Thompson
- Re: [dmarc-ietf] Search for some consensus, was: … Jim Fenton
- Re: [dmarc-ietf] Search for some consensus, was: … Scott Kitterman
- Re: [dmarc-ietf] Search for some consensus, was: … Hector Santos
- Re: [dmarc-ietf] Search for some consensus, was: … Brotman, Alex
- Re: [dmarc-ietf] Search for some consensus, was: … Alessandro Vesely
- Re: [dmarc-ietf] Search for some consensus, was: … Alessandro Vesely
- Re: [dmarc-ietf] Search for some consensus, was: … Scott Kitterman
- Re: [dmarc-ietf] Search for some consensus, was: … Jesse Thompson
- Re: [dmarc-ietf] Search for some consensus, was: … Jesse Thompson
- Re: [dmarc-ietf] Search for some consensus, was: … Jesse Thompson
- Re: [dmarc-ietf] Search for some consensus, was: … Scott Kitterman
- Re: [dmarc-ietf] Search for some consensus, was: … Scott Kitterman
- Re: [dmarc-ietf] Search for some consensus, was: … Jesse Thompson
- Re: [dmarc-ietf] Search for some consensus, was: … Jesse Thompson
- Re: [dmarc-ietf] Search for some consensus, was: … Alessandro Vesely
- Re: [dmarc-ietf] Search for some consensus, was: … Alessandro Vesely
- Re: [dmarc-ietf] Proposed text for p=reject and i… Alessandro Vesely
- Re: [dmarc-ietf] Search for some consensus, was: … Scott Kitterman
- Re: [dmarc-ietf] Proposed text for p=reject and i… Hector Santos
- [dmarc-ietf] Summary: Search for some consensus, … Scott Kitterman
- Re: [dmarc-ietf] Summary: Search for some consens… Douglas Foster
- Re: [dmarc-ietf] Summary: Search for some consens… Hector Santos
- Re: [dmarc-ietf] Summary: Search for some consens… Douglas Foster
- [dmarc-ietf] Add MLS/MLM subscription/submissions… Hector Santos
- Re: [dmarc-ietf] Add MLS/MLM subscription/submiss… Douglas Foster
- Re: [dmarc-ietf] Add MLS/MLM subscription/submiss… Emanuel Schorsch
- Re: [dmarc-ietf] Add MLS/MLM subscription/submiss… Douglas Foster
- Re: [dmarc-ietf] Add MLS/MLM subscription/submiss… Alessandro Vesely
- Re: [dmarc-ietf] Add MLS/MLM subscription/submiss… Douglas Foster
- Re: [dmarc-ietf] Add MLS/MLM subscription/submiss… Hector Santos
- Re: [dmarc-ietf] Add MLS/MLM subscription/submiss… Brotman, Alex
- Re: [dmarc-ietf] Add MLS/MLM subscription/submiss… Hector Santos
- [dmarc-ietf] Fwd: Summary: Search for some consen… Scott Kitterman