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Message-ID: <3de5641469dc26e02c2fbb9cccaee3419d364973@linux.dev>
Date: Tue, 25 Jun 2024 01:57:36 +0000
From: "Lance Yang" <lance.yang@...ux.dev>
To: "Rich Felker" <dalias@...c.org>
Cc: "Thorsten Glaser" <tg@...bsd.de>, musl@...ts.openwall.com, "Jan Mercl"
<0xjnml@...il.com>, "Lance Yang" <ioworker0@...il.com>
Subject: Re: [PATCH 1/1] improve DNS resolution logic for parallel
queries
June 24, 2024 at 10:57 PM, "Rich Felker" <dalias@...c.org> wrote:
>
> On Mon, Jun 24, 2024 at 11:56:01AM +0000, Lance Yang wrote:
>
> >
> > June 24, 2024 at 2:52 AM, "Thorsten Glaser" <tg@...bsd.de> wrote:
> >
> >
> >
> > Lance Yang dixit:
> >
> >
> >
> > >
> >
> > > I understand your concern that continuing the search after receiving an
> >
> > >
> >
> > > NXDOMAIN response might pose a security risk. Will look into this issue
> >
> > >
> >
> >
> >
> > It’s not (just) a security risk, it’s how DNS works.
> >
> >
> >
> > NXDOMAIN means “I am a nameserver responsible for resolving your
> >
> >
> >
> > query, and I can state with confidence that the entry you requested
> >
> >
> >
> > does not exist” so no other responsible nameserver’s response can
> >
> >
> >
> > rightly differ.
> >
> >
> >
> > Sorry to bother you again. Could you please let me know from which
> >
> > document or standard this description is taken?
> >
> >
> >
> > Any details about the specific RFC, technical documentation, or other
> >
> > authoritative sources would be greatly appreciated.
> >
>
> RFC 2308 is the main source I can think of for clarifying the meaning
>
> and expected behavior for NxDomain. The only relevant amendments I can
>
> find are RFC 8020 and 9520, but neither of them change anything
>
> related to the basic meaning.
Thanks a lot for taking time to reply!
I will refer to these documents for a deeper understanding of the
NxDomain behavior ;)
Have a good one,
Lance
>
> Rich
>
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