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[Acme] tls-alpn-01 spec: TLS-SNI history

Felipe Gasper <felipe@felipegasper.com> Wed, 20 June 2018 00:30 UTC

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From: Felipe Gasper <felipe@felipegasper.com>
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Date: Tue, 19 Jun 2018 20:30:32 -0400
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Subject: [Acme] tls-alpn-01 spec: TLS-SNI history
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Having read over the history of TLS-SNI as reported in the draft spec, I feel like it might be prudent to mention that a significant part of the failure of TLS-SNI was Apache httpd and its (nonsensical, IMO) behavior of sending certificates for domains that don’t match the SNI request.

The write-up mentions “service providers”; for what it’s worth, I feel like a more complete and accurate picture would also indicate that “popular server software” (e.g., Apache … maybe others?) will happily serve up a certificate that has no connection with the SNI request, and that this is also a significant part of why TLS-SNI did not work.

-Felipe Gasper
Mississauga, ON

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