[dns-operations] Can Root DNS server modify the response?

Davey Song songlinjian at gmail.com
Wed Mar 27 02:51:40 UTC 2019


AFAIK, Root servers returning SERVFAIL to specific regions or countries are
listed as a risk in the circle who have long concerns on Root governance.
But return to Cloudflare case, it is not a problem. If two letters
return SERVFAIL maliciously, resolvers can query other server to get the
answer back. So diversity of root server operators and location are
important in this case.

Davey

On Mon, 25 Mar 2019 at 23:03, Ondřej Surý <ondrej at sury.org> wrote:

> Matt, there’s no difference between NXDOMAIN and SERVFAIL from the client
> perspective.
>
> Ondřej
> --
> Ondřej Surý <ondrej at sury.org>
>
> On 25 Mar 2019, at 15:19, Matthew Pounsett <matt at conundrum.com> wrote:
>
>
>
> On Mon, 25 Mar 2019 at 15:08, Florian Weimer <fw at deneb.enyo.de> wrote:
>
>> >
>> > that's great, but it doesn't matter, since CF doesn't have the signing
>> > key. any modifications that any operator makes, even RFC 7706
>> operators,
>> > try to make will fail loudly and embarrassingly.
>> >
>> > let's call this question absurd and move on.
>>
>> Yes, but let's not pretend that DNSSEC stops an authoritative server
>> from suppressing data.  It does not.  So if the concern is censorship
>> by the authoritative server operator (not sure if that's the case
>> here), then DNSSEC is completely irrelevant.
>>
>
> No, that's wrong.  DNSSEC provides authenticated denial of existence.  If
> a root authoritative operator tried to suppress data, the NSEC records
> wouldn't match and the response wouldn't validate.  It'd be the same as if
> they tried to change any other data in the zone.
>
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