Re: [DNSOP] [Doh] On today's resolverless DNS meeting

Justin Henck <henck@google.com> Tue, 06 November 2018 14:45 UTC

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From: Justin Henck <henck@google.com>
Date: Tue, 6 Nov 2018 21:44:55 +0700
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To: jabley@hopcount.ca
Cc: Mukund Sivaraman <muks@mukund.org>, dnsop@ietf.org, doh@ietf.org, resolverless-dns@ietf.org
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Subject: Re: [DNSOP] [Doh] On today's resolverless DNS meeting
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Briefly jumping in to add resolverless-dns@ietf.org, which was set up after
the last meeting for discussion of this specific topic.  Direct link:
https://www.ietf.org/mailman/listinfo/resolverless-dns

I also just sent the notes to that mailing list.

Justin Henck
Product Manager
212-565-9811
google.com/jigsaw

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On Tue, Nov 6, 2018 at 9:39 PM Joe Abley <jabley@hopcount.ca> wrote:

> > On Nov 6, 2018, at 17:27, Mukund Sivaraman <muks@mukund.org> wrote:
> >
> > We talked about DNSSEC and certificate signing and such. If the host
> > serving this webpage to the browser has control over the webpage's
> > content (e.g., the contents of that src attribute), and the webpage's
> > contents are already authenticated by TLS, then why does an address
> > record have to be separately authenticated?
>
> I think this is an easy one. It doesn't.
>
> The names that it is permissible for a server to push information
> about (and the names that a client should be allowed to accept) must
> be constrained such that the names supplied for use in one web
> application can't influence the operation of another.
>
> (For example, it would be bad if some generic and otherwise benign web
> page could feed the browser high-TTL DNS messages for names under
> online retailer domains that accept credit cards or component APIs
> used within genuine web apps.)
>
> The obvious analogy to me is the logic that controls what cookies a
> browser should accept. Maybe exactly the same rules are appropriate. I
> realise that managing those rules using mechanisms like the public
> suffix list is not without challenges.
>
> If we accept that these constraints are necessary, then the presence
> or absence of DNSSEC signatures doesn't matter. The DoH objects are
> within the same security perimeter as the URIs that make use of them
> and don't benefit from additional integrity protection; the transport
> security for all the other objects being sent from server to client
> provides the right coverage.
>
>
> Joe
>
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