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Re: [dns-privacy] Datatracker State Update Notice: <draft-ietf-dprive-rfc7626-bis-04.txt>

Eric Rescorla <ekr@rtfm.com> Mon, 09 March 2020 21:58 UTC

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From: Eric Rescorla <ekr@rtfm.com>
Date: Mon, 09 Mar 2020 14:57:55 -0700
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To: Brian Dickson <brian.peter.dickson@gmail.com>
Cc: Sara Dickinson <sara@sinodun.com>, "Eric Vyncke (evyncke)" <evyncke@cisco.com>, "dprive-chairs@ietf.org" <dprive-chairs@ietf.org>, "dns-privacy@ietf.org" <dns-privacy@ietf.org>, "draft-ietf-dprive-rfc7626-bis@ietf.org" <draft-ietf-dprive-rfc7626-bis@ietf.org>
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Subject: Re: [dns-privacy] Datatracker State Update Notice: <draft-ietf-dprive-rfc7626-bis-04.txt>
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On Mon, Mar 9, 2020 at 2:14 PM Brian Dickson <brian.peter.dickson@gmail.com>
wrote:

>
>
> On Mon, Mar 9, 2020 at 1:14 PM Eric Rescorla <ekr@rtfm.com> wrote:
>
>>
>> As I said, Chrome does its own name resolution and has for quite some
>> time, using the resolvers configured into the system and then sending its
>> own DNS packets. This used to be common practice in SIP softphones, but I
>> haven't worked on one in quite some time.  I'm not sure on what basis you
>> claim iOS doesn't support this, as that's not my understanding. Can you
>> provide a citation here?
>>
>
> Sure.
>
> From
> https://developer.apple.com/documentation/networkextension/dns_proxy_provider
>
> DNS proxy providers are only supported on supervised iOS devices.
>
>
> (And the latter is described here:
> https://support.apple.com/guide/apple-configurator-2/supervised-devices-apd9e4f64088/mac
>  )
>
> So basically, the ability to use third party DNS is limited to managed
> devices, corporate or education.
> The only other exception is the one done via VPN services, which is a
> different set of frameworks, IIUC.
> (That's why 1.1.1.1 is a VPN app rather than just a resolver, I believe.)
>

Ah. I think we are talking about different things:

- Yes, it seems like iOS does not officially support an app which provides
DNS services for other apps (though apparently there is an unofficial way
to do it via the VPN hooks)
- Individual apps, however, are able to do their own DNS resolution via the
obvious mechanism of sending their own UDP packets to port 53.

-Ekr

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