RPZ for reverse lookups ?

[Noel Butler]

On 25/08/2019 06:56, J Doe wrote:

> Hello, 
> 
> I have a basic question regarding RPZ on Bind 9.11.x. 
> 
> Is it possible to re-write a response on a reverse lookup ?  For instance, if I considered example.com [1] a "bad domain", can I write a RPZ policy so that a reverse lookup of IP's that map to example.com [1] fails or is blocked ? 
> 
> I know I can do this with a forward lookup to generate NXDOMAIN: 
> 
> ; Forward resolution of: example.com [1] and subdomains generates: NXDOMAIN 
> 
> example.co [2]m        IN CNAME . 
> *.example.com [1]      IN CNAME . 
> 
> ...but can this also be done on reverse lookups ? 
> 
> Thanks,

This can have disastrous affects if this is for a public network given
shared hosting. 

An Australian govt dept (ASIC) ordered a s313 block on an IP couple
years back, turns out that IP supplied about 2K hosts, 99.9% all of
which were very legitimate, including many aussie businesses. 

And I still dont know whats worse, the clueless idiots in ASIC (who
thankfully have now due to that incident lost most that power), or the
clueless idiots in the ISP's networking who blindly accepted and enacted
the block. 

To put it in RFC terms for non aussies, s313 is a SHOULD, and  _not_ a
MUST. 
If theres genuine reason, ie mass collateral damage, you can lawfully
refuse to carry out such requests. 

-- 
Kind Regards, 

Noel Butler 

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