[Cerowrt-devel] Fwd: [Dnsmasq-discuss] dnssec-check-unsigned breaks linux.conf.au

[Cerowrt-devel] Fwd: [Dnsmasq-discuss] dnssec-check-unsigned breaks linux.conf.au

[Dave Taht]

if I haven't already said this, anybody using dnssec in
cerowrt-3.10.50-1 should just disable it.

The number of corner cases and bugs found and fixed in the last few
months on dnssec has been pretty amazing. dnsmasq-2.73 is now at rc9 I
think....


---------- Forwarded message ----------
From: Simon Kelley <simon@thekelleys.org.uk>
Date: Sun, Jun 7, 2015 at 1:53 AM
Subject: Re: [Dnsmasq-discuss] dnssec-check-unsigned breaks linux.conf.au
To: dnsmasq-discuss@lists.thekelleys.org.uk


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On 07/06/15 09:06, Karl-Johan Karlsson wrote:
> On Sat 06 Jun 2015 23.16.42 Simon Kelley wrote:
>> Turns out that this domain has a "weird" by valid use of NSEC3
>> which broke dnsmasq's corner-case code.
>>
>> 2.73rc9 should fix it.
>
> Thanks, it looks like it works.
>
>

Good stuff.

A longer explanation (using NSEC because it's easier to understand,
NSEC3, which was used in this case, has the same principle but it less
obvious to understand.)


An NSEC record is a signed record that proves no names exist in a
certain alphabetic range

so

apple.example.com  NSEC cherry.example.com

proves that

bananna.example.com cannot exist.


If the next name is before the name of the NSEC, then it covers the
wrap-around region, so

cherry.example.com NSEC apple.example.com

proves there are no names after cherry, and no names before apple.


The tricky one is

apple.example.com NSEC apple.example.com

The obvious answer is that proves nothing, and that's what the dnsmasq
code calculated. In fact it's an instance of the wraparound case, and
proves that _only_ apple exists.

It's fun stuff, this DNSSEC.


Simon.


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-- 
Dave Täht
What will it take to vastly improve wifi for everyone?
https://plus.google.com/u/0/explore/makewififast

Re: [Cerowrt-devel] Fwd: [Dnsmasq-discuss] dnssec-check-unsigned breaks linux.conf.au

[Kevin Darbyshire-Bryant]

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It is 2.73rc9(!) and I submitted a patch to openwrt this morning to bump 
to that version (then I submitted version 2 to sort out the line wrapping)

There are a number of people hoping that a release is imminent but stuff 
just keeps on being found.

Stop testing & looking in dark corners you fools :-)

On 07/06/15 18:51, Dave Taht wrote:
> if I haven't already said this, anybody using dnssec in
> cerowrt-3.10.50-1 should just disable it.
>
> The number of corner cases and bugs found and fixed in the last few
> months on dnssec has been pretty amazing. dnsmasq-2.73 is now at rc9 I
> think....
>
>
> ---------- Forwarded message ----------
> From: Simon Kelley <simon@thekelleys.org.uk>
> Date: Sun, Jun 7, 2015 at 1:53 AM
> Subject: Re: [Dnsmasq-discuss] dnssec-check-unsigned breaks linux.conf.au
> To: dnsmasq-discuss@lists.thekelleys.org.uk
>
>
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA256
>
> On 07/06/15 09:06, Karl-Johan Karlsson wrote:
>> On Sat 06 Jun 2015 23.16.42 Simon Kelley wrote:
>>> Turns out that this domain has a "weird" by valid use of NSEC3
>>> which broke dnsmasq's corner-case code.
>>>
>>> 2.73rc9 should fix it.
>> Thanks, it looks like it works.
>>
>>
> Good stuff.
>
> A longer explanation (using NSEC because it's easier to understand,
> NSEC3, which was used in this case, has the same principle but it less
> obvious to understand.)
>
>
> An NSEC record is a signed record that proves no names exist in a
> certain alphabetic range
>
> so
>
> apple.example.com  NSEC cherry.example.com
>
> proves that
>
> bananna.example.com cannot exist.
>
>
> If the next name is before the name of the NSEC, then it covers the
> wrap-around region, so
>
> cherry.example.com NSEC apple.example.com
>
> proves there are no names after cherry, and no names before apple.
>
>
> The tricky one is
>
> apple.example.com NSEC apple.example.com
>
> The obvious answer is that proves nothing, and that's what the dnsmasq
> code calculated. In fact it's an instance of the wraparound case, and
> proves that _only_ apple exists.
>
> It's fun stuff, this DNSSEC.
>
>
> Simon.
>
>
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>



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