Maintained by: NLnet Labs

wildcard dnssec test fails

W.C.A. Wijngaards
Fri Dec 15 11:49:49 CET 2017


Hi,

Wait, no, just CFLAGS=-g ./configure disables -O2, but you also need the
code change.  So that won't work as a workaround.

Best regards, Wouter

On 15/12/17 11:40, W.C.A. Wijngaards via Unbound-users wrote:
> Hi Sebastian
> 
> On 15/12/17 10:19, Sebastian Schmidt via Unbound-users wrote:
>> On 15 December 2017 at 6:09:19 pm, W.C.A. Wijngaards via Unbound-users
>> (unbound-users at unbound.net <mailto:unbound-users at unbound.net>) wrote:
>>> When I run unbound-host, I get no errors, 
>>> ./unbound-host  www.wilda.nsec.0skar.czwww.wilda.nsec.0skar.cz
>>> <http://www.wilda.nsec.0skar.czwww.wilda.nsec.0skar.cz> -f 
>>> root.key -v -t A 
>>> www.wilda.nsec.0skar.czwww.wilda.nsec.0skar.cz
>>> <http://www.wilda.nsec.0skar.czwww.wilda.nsec.0skar.cz> has address 
>>> 85.239.227.179 (secure) 
>>>
>>> Unbound performs serial arithmatic on the timestamps in the rrsig, 
>>> according to RFC. 
>>>
>>> (What does that mean? The timestamps are 32bit in the RRSIG, but the 
>>> value is interpreted relative to the current date. And what you cannot 
>>> do is express something like a point more than some number of years 
>>> future or past.) 
>>>
>>> Best regards, Wouter 
>>
>>
>> Hello Wouter,
>>
>>
>> Thanks for the insight. Maybe this has something to with the platform?
> 
> Yes it is the compiler.  Clang fails, gcc succeeds.  I can make clang
> succeed with a small code change together with the removal of -O2
> (disabling clang's optimizer).
> 
> The code change is instead of if(incep - expi > 0) ..fail..  it now has
> var=incep-expi; if(var > 0) ..fail..
> 
> Clangs optimizer seems to take the wrong branch in the if statement.  If
> I printout the value calculated, I get the correct output.  Something
> like if(!((incep-expi)&0x80000000)) ..fail.. does not trick the
> optimizer into taking the right branch.
> 
> The code change is in the code repository.
> CFLAGS=-g ./configure
> This disables -O2 as well, with the current version of unbound.
> 
> Or as a workaround, maybe ignore this, perhaps with domain-insecure,
> because it seems to only happen for the int32_t values of (1391084010 -
> -823674496 > 0).  And 2080 is uncommon in RRSIG timestamps.
> 
> Best regards, Wouter
> 
>>
>>  CentOS 6.9:
>>
>>   $ unbound-host -v -f /etc/unbound/root.key -t A www.wilda.nsec.0skar.cz
>>
>>   www.wilda.nsec.0skar.cz is an alias for flexi.oskarcz.net. (secure)
>>
>>   flexi.oskarcz.net has address 85.239.227.179 (secure)
>>
>>
>> MacOS 10.13.2 (High Sierra):
>>
>>   $ unbound-host -v -t A -f /usr/local/etc/unbound/root.key
>> www.wilda.nsec.0skar.cz
>>
>>   www.wilda.nsec.0skar.cz is an alias for flexi.oskarcz.net. (BOGUS
>> (security failure))
>>
>>   flexi.oskarcz.net has address 85.239.227.179 (BOGUS (security failure))
>>
>>   validation failure <www.wilda.nsec.0skar.cz. A IN>: signature
>> inception after expiration from 85.239.227.179 for key nsec.0skar.cz.
>> while building chain of trust
>>
>>
>> FreeBSD 11.1:
>>
>>   $ unbound-host -v -f /usr/local/etc/unbound/root.key -t A
>> www.wilda.nsec.0skar.cz
>>
>>   www.wilda.nsec.0skar.cz is an alias for flexi.oskarcz.net. (BOGUS
>> (security failure))
>>
>>   flexi.oskarcz.net has address 85.239.227.179 (BOGUS (security failure))
>>
>>   validation failure <www.wilda.nsec.0skar.cz. A IN>: signature
>> inception after expiration from 2001:1528:132:70::1 for key
>> nsec.0skar.cz. while building chain of trust
>>
>>
>> Kind Regards
>>
>> Sebastian
>>
> 
> 


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