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Re: [Add] [EXTERNAL] Re: draft-grover-add-policy-detection-00

Michael Sinatra <michael@brokendns.net> Tue, 16 July 2019 20:59 UTC

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To: Eric Rescorla <ekr@rtfm.com>, ek@loon.com
Cc: Alec Muffett <alec.muffett@gmail.com>, add@ietf.org, "Dixon, Hugh" <Hugh.Dixon@sky.uk>, Rob Sayre <sayrer@gmail.com>
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From: Michael Sinatra <michael@brokendns.net>
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Date: Tue, 16 Jul 2019 13:59:29 -0700
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Subject: Re: [Add] [EXTERNAL] Re: draft-grover-add-policy-detection-00
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On 7/16/19 1:47 PM, Eric Rescorla wrote:

>     When we did the DNS-over-TLS config for Android we chose it be
>     hostname-based, on the theory that you could bootstrap using the
>     network-provided nameservers, DNSSEC (which, admittedly, Android
>     didn't support), and TLS (including optional browser security
>     measures on top, perhaps cert pinning, etc.)
> 
>     I couldn't see how to make it much better than that.
> 
> 
> Yes, this is how Firefox works as well, but that requires someone to 
> supply Fx with the hostname..

This may be getting into the weeds, but unbound (for example) has 
mechanisms for tagging a hostname to the forwarder IP address for 
cert-validation purposes.

Basically, the problem is solved in a similar way for DoT as in DoH. 
The format of the TRR is just a bit different...

michael

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