Re: [DNSOP] ALT-TLD and (insecure) delgations.

Mark Andrews <marka@isc.org> Fri, 10 February 2017 06:02 UTC

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To: Ted Lemon <ted.lemon@nominum.com>
From: Mark Andrews <marka@isc.org>
References: <20170207205554.B6974633BE40@rock.dv.isc.org> <18F2EB0D-5BD0-4CC5-B02C-2E5EA0B8CC23@fugue.com> <20170207214846.B66EF633C6C5@rock.dv.isc.org> <FB835756-2C46-40A9-88ED-2F8ADF812BA6@fugue.com> <20170208052544.862956356F33@rock.dv.isc.org> <FFAFD844-824C-44EA-A4B1-1AD28B4FE95C@fugue.com> <20170208060208.8C8E1635864D@rock.dv.isc.org> <E0A42577-0984-4ADD-8658-91413CBE783D@fugue.com> <20170208194208.DB02C635DD72@rock.dv.isc.org> <CAH1iCipA5nvWJqjdGUwJeeT_eU8EH8VYJU2hX1hJoiTb617K8Q@mail.gmail.com> <20170209163123.56hdbzaluekmvbh7@nic.fr> <20170209195722.DC1AB636586C@rock.dv.isc.org> <0394528C-99CD-41D4-9AB6-844D1318264C@gmail.com> <20170209204506.BC40D6365CBE@rock.dv.isc.org> <12D7473B-3A22-4A8D-9C13-2AEEDEABB879@fugue.com> <20170209224851.2FB1B63666E6@rock.dv.isc.org> <CAPt1N1nLmdoZ_3Kb8Kfp9sTsN-GYqo1A9CF3j4zb7QCvO3SLew@mail.gmail.com> <20170209232830.0DE1B63669D6@rock.dv.isc.org> <CFB6BEB2-4110-406A-A917-FC6361061B1C@fugue.com> <20170210004801.EEFE9636B89C@rock.dv.isc.org> <653 A3403-DFC8-491A-B083-7873D1886A12@fugue.com> <20170210015725.BF777636C97F@rock.dv.isc.org> <E5AB0A08-0DDA-496A-811E-25C1BA2765BA@nominum.com>
In-reply-to: Your message of "Thu, 09 Feb 2017 21:44:53 -0500." <E5AB0A08-0DDA-496A-811E-25C1BA2765BA@nominum.com>
Date: Fri, 10 Feb 2017 16:07:01 +1100
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Subject: Re: [DNSOP] ALT-TLD and (insecure) delgations.
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In message <E5AB0A08-0DDA-496A-811E-25C1BA2765BA@nominum.com>, Ted Lemon writes
:
> 
> On Feb 9, 2017, at 8:57 PM, Mark Andrews <marka@isc.org> wrote:
> > I'm developing software that will be run on private internets with
> > various degrees of compentence from the adminitrators as well as
> > the public Internet.  That private internet may have a ENT for ALT
> > that returns NXDOMAIN.  The server has to work in that environment.
> 
> I don't know what an ENT is.

Empty Non Terminal which is a quite common acronym in this group.

>   In any case, I don't see what this has to do with what we are talking
> about.   It is an absolute fact that if you want ALT queries not to leak
> you need to have a specially-configured recursive resolver,

Pray tell what specially-configured recursive resolver works?

> or else one that is really quite up to date.

Actually one from the future.  We don't have a RFC that say to perform
agressive negative caching.

> If you have one that is really quite
> up to date, a secure denial of existence will do the right thing.

Only if you also validate.

You are putting the "you can play bar" for privacy at the ceiling.

> So we are really just arguing about how to specially configure
> out-of-date resolvers.   This is really out of scope.   There is nothing
> dnsop can do to make sure that these queries do not leak, so we should
> just decide what the right design is assuming that all the moving parts
> are working correctly, and leave it at that.

Mark
-- 
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: marka@isc.org