Re: [dns-privacy] Martin Duke's No Objection on draft-ietf-dprive-xfr-over-tls-11: (with COMMENT)

Martin Thomson <mt@lowentropy.net> Thu, 29 April 2021 00:09 UTC

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Date: Thu, 29 Apr 2021 10:09:05 +1000
From: "Martin Thomson" <mt@lowentropy.net>
To: dns-privacy@ietf.org
Cc: tls@ietf.org
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Archived-At: <https://mailarchive.ietf.org/arch/msg/dns-privacy/UZCL25P8vPYRYwYZcms5KxQmJTU>
Subject: Re: [dns-privacy] =?utf-8?q?Martin_Duke=27s_No_Objection_on_draft-ie?= =?utf-8?q?tf-dprive-xfr-over-tls-11=3A_=28with_COMMENT=29?=
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On Wed, Apr 28, 2021, at 20:27, Sara Dickinson wrote:
> An early version of this specification proposed a XoT specific ALPN in 
> order to distinguish this from a connection intended to perform 
> recursive to authoritative DoT (often called ADoT). ADoT is not yet 
> specified, but is the subject of ongoing discussions in DPRIVE. The 
> working group rejected this idea for XoT and switched to the current 
> spec which does not use an ALPN at all. 

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?