[TLS] Recommending ALPN (was Re: [dns-privacy] Martin Duke's No Objection on draft-ietf-dprive-xfr-over-tls-11 ...)

Martin Thomson <mt@lowentropy.net> Fri, 30 April 2021 00:06 UTC

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Date: Fri, 30 Apr 2021 10:05:48 +1000
From: "Martin Thomson" <mt@lowentropy.net>
To: "Salz, Rich" <rsalz@akamai.com>
Cc: "tls@ietf.org" <tls@ietf.org>, uta@ietf.org
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Subject: [TLS] =?utf-8?q?Recommending_ALPN_=28was_Re=3A___=5Bdns-privacy?= =?utf-8?q?=5D_Martin_Duke=27s_No_Objection_on_draft-ietf-dprive-xfr-over-?= =?utf-8?b?dGxzLTExIC4uLik=?=
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(dprive to bcc, because this is getting further afield)

On Fri, Apr 30, 2021, at 00:26, Salz, Rich wrote:
> >    No new protocol should use TLS without ALPN.  It only opens space for cross-protocol attacks.  Did the working group consider this possibility in their discussions?
> 
> I don't believe that message has been made as public as it should be.

I see that UTA is working on a revision of RFC 7525.  Is text on this something that would be in scope.  I only just searched for "ALPN", finding nothing, so maybe it is not in the original scope and maybe there are things that might prevent expansion of scope.