[dnsdist] dnsdist 1.7 : allow only A request

[david.neau at orange.com]

Hello Jacob,

I did this :

addAction(
        NotRule (
                OrRule {QTypeRule(DNSQType.A), QTypeRule(DNSQType.AAAA)}
                ),
        AllowAction()
)

And it works as expected :

> showRules()
#   Name                             Matches Rule                                                     Action
0                                          0 !((qtype==A) || (qtype==AAAA))                           allow

Thanks for your help

Regards
/d


Orange Restricted

-----Message d'origine-----
De : dnsdist <dnsdist-bounces at mailman.powerdns.com> De la part de Jacob Bunk Nielsen via dnsdist
Envoyé : lundi 13 mars 2023 06:41
À : dnsdist at mailman.powerdns.com
Objet : Re: [dnsdist] dnsdist 1.7 : allow only A request

On 10/03/2023 09.21, david n via dnsdist wrote:
> I tried to explicitly deny the most current DNS requests like for ex :
>
> -- refused query type :
> 	addAction(QTypeRule(dnsdist.ANY), DropAction())
> 	addAction(QTypeRule(dnsdist.SOA), DropAction())

With dnsdist 1.4 (as far as I remember) those names for the various query types changed, so dnsdist.ANY became DNSQType.ANY.

For your particular case of only wanting to serve A and AAAA records I would probably just do (untested):

addAction(
NotRule(OrRule({QTypeRule(DNSQType.A),QTypeRule(DNSQType.AAAA)})),
RCodeAction(DNSRCode.REFUSED))

With all the warnings that Stephane already gave you about why this is a bad idea.

You can replace RCodeAction(DNSRCode.REFUSED) with DropAction() if you don't even want to reply with a REFUSED response.

Best regards,

Jacob


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