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[lamps] Re: Draft leafy greens feedback

Michael Richardson <mcr+ietf@sandelman.ca> Sun, 30 August 2026 14:57 UTC

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From: Michael Richardson <mcr+ietf@sandelman.ca>
To: Mike Ounsworth <mike=40ounsworth.ca@dmarc.ietf.org>
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Date: Sun, 30 Aug 2026 10:57:01 -0400
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Subject: [lamps] Re: Draft leafy greens feedback
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Mike Ounsworth <mike=40ounsworth.ca@dmarc.ietf.org> wrote:
    > My vote is to publish a draft that acknowledges and closes the gap
    > between 5280 + 9525 by just documenting the obvious RP behaviour of
    > "Clearly you can't accept a cert for *.example.com; exclude:
    > foo.example.com when trying to connect to foo.example.com. If we do it
    > right, that RFC will be a no-op for CA implementations, a no-op for
    > clients that already do that check in some kind of sensible way, and a
    > wakeup call for clients that didn't realize there was a problem.

Fantastic.

Does this mean that positive (include subtrees) actually works widely enough
that we can (a) mark the extension as critical, (b) when CAs actually use it.

(I think a wise CA does not use exclusions)


--
Michael Richardson <mcr+IETF@sandelman.ca>   . o O ( IPv6 IøT consulting )
           Sandelman Software Works Inc, Ottawa and Worldwide

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