Re: [Pdns-users] Spoof MX records

2018-12-15 Thread Bit World Computing - Michael Mertel 

> Am 15.12.2018 um 09:50 schrieb bert hubert :
> 
> On Sat, Dec 15, 2018 at 09:42:21AM +0100, Bit World Computing - Michael 
> Mertel wrote:
>> Hi Aleksandr,
>> 
>> I’am somewhat lost, I’am able to set a rule to have the Lua function called 
>> for MX requests, but how do I return a response? Spoof ist just for 
>> A-records, but not for MX.
>> addLuaAction(QTypeRule(dnsdist.MX), luarule)
> 
> Hi Michael,
> 
> As far as I know, dnsdist can't generate MX records, so you'll have to do
> this in the PowerDNS Recursor. Sorry!
> 
> In the Recursor it is not very hard to do though, use postResolve to
> override all MX records you see in responses.
> 
> This makes sure you don't invent MX records for domains that don't have
> them.
> 
> Also be aware that if there is no MX record for a domain, a mail server
> might decide to send email directly to the A record.
> 
> Good luck!
> 
>   Bert

Thanks Bert you saved my day, will switch over to recursor.

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Re: [Pdns-users] Spoof MX records

2018-12-15 Thread bert hubert 
On Sat, Dec 15, 2018 at 09:42:21AM +0100, Bit World Computing - Michael Mertel 
wrote:
> Hi Aleksandr,
> 
> I’am somewhat lost, I’am able to set a rule to have the Lua function called 
> for MX requests, but how do I return a response? Spoof ist just for 
> A-records, but not for MX.
> addLuaAction(QTypeRule(dnsdist.MX), luarule)

Hi Michael,

As far as I know, dnsdist can't generate MX records, so you'll have to do
this in the PowerDNS Recursor. Sorry!

In the Recursor it is not very hard to do though, use postResolve to
override all MX records you see in responses.

This makes sure you don't invent MX records for domains that don't have
them.

Also be aware that if there is no MX record for a domain, a mail server
might decide to send email directly to the A record.

Good luck!

Bert
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Re: [Pdns-users] Spoof MX records

2018-12-15 Thread Bit World Computing - Michael Mertel 
Hi Aleksandr,

I’am somewhat lost, I’am able to set a rule to have the Lua function called for 
MX requests, but how do I return a response? Spoof ist just for A-records, but 
not for MX.
addLuaAction(QTypeRule(dnsdist.MX), luarule)

Do I have to generate an Answer, but how? Is it possible to use 
dq::addAnswer(), which I have found in the recursor documentation, is this 
valid for dnsdist too?

Best regards.


> Am 14.12.2018 um 17:16 schrieb Aleksandr Rogozin :
> 
> Hi Michael,
> 
> You should be able to load the file (if the list of zones is large enough and 
> warrants a file) or initialize array of subzones (if there are few zones you 
> want to test) once, when the process starts and loads the Lua script. Loading 
> the file on every request would definitely become a performance issue.
> 
> Best Regards,
> 
> On Fri, Dec 14, 2018 at 10:50 AM Bit World Computing - Michael Mertel 
> mailto:michael.mer...@bwc.de>> wrote:
> Hi Aleksandr,
> 
> ja Lua was the way I’m planning to go. But just wasn’t sure to use dnsdist or 
> recursor, but probably does not matter in that case.
> 
> Does the file gets loaded for every request with io.open and could this 
> become a performance issue in your opinion? All DNS requests from a fairly 
> good used mail gateway would be sent to this resolver.
> 
> I think I’ll give it a try with dnsdist and see what happens.
> 
> Best regards.
> 
> 
> 
>> Am 14.12.2018 um 12:55 schrieb Aleksandr Rogozin > >:
>> 
>> Hi Michael,
>> 
>> I recommend using Lua to intercept the DNS queries. Both dnsdist and 
>> recursor should be able to support it. In Lua you can check for query type 
>> to be MX and load a list of domains from a file using ‘io.open’. Provide 
>> necessary DNS response if the query matches your list of zones. 
>> Additionally, you might want to limit this operation to specific networks 
>> with NetMask or NetMaskGroup.
>> 
>> 
>> On Fri, Dec 14, 2018 at 01:53 Bit World Computing - Michael Mertel 
>> mailto:michael.mer...@bwc.de>> wrote:
>> Hi,
>> 
>> I’am looking for the most efficent way to spoof the answer of a MX query. I 
>> need to redirect outgoing e-mails (specific domains only) to a smtp gateway 
>> for further processing before it leaves the local network. I cannot use any 
>> kind of transport tables at the MTA, so my approach was to use dns therefore.
>> 
>> The number of zones to spoof is currently not defined, could be dozens if 
>> not hundreds.
>> 
>> I would usually do this kind of stuff with dnsdist (which I love), but would 
>> the recursor a better choice here?
>> 
>> Thanks for any advice.
>> 
>> —Michael
>> 
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>> 
> 
> 
> ___
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Re: [Pdns-users] Spoof MX records

2018-12-14 Thread Bit World Computing - Michael Mertel 
Hi Aleksandr,

ja Lua was the way I’m planning to go. But just wasn’t sure to use dnsdist or 
recursor, but probably does not matter in that case.

Does the file gets loaded for every request with io.open and could this become 
a performance issue in your opinion? All DNS requests from a fairly good used 
mail gateway would be sent to this resolver.

I think I’ll give it a try with dnsdist and see what happens.

Best regards.



> Am 14.12.2018 um 12:55 schrieb Aleksandr Rogozin :
> 
> Hi Michael,
> 
> I recommend using Lua to intercept the DNS queries. Both dnsdist and recursor 
> should be able to support it. In Lua you can check for query type to be MX 
> and load a list of domains from a file using ‘io.open’. Provide necessary DNS 
> response if the query matches your list of zones. Additionally, you might 
> want to limit this operation to specific networks with NetMask or 
> NetMaskGroup.
> 
> 
> On Fri, Dec 14, 2018 at 01:53 Bit World Computing - Michael Mertel 
> mailto:michael.mer...@bwc.de>> wrote:
> Hi,
> 
> I’am looking for the most efficent way to spoof the answer of a MX query. I 
> need to redirect outgoing e-mails (specific domains only) to a smtp gateway 
> for further processing before it leaves the local network. I cannot use any 
> kind of transport tables at the MTA, so my approach was to use dns therefore.
> 
> The number of zones to spoof is currently not defined, could be dozens if not 
> hundreds.
> 
> I would usually do this kind of stuff with dnsdist (which I love), but would 
> the recursor a better choice here?
> 
> Thanks for any advice.
> 
> —Michael
> 
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> https://mailman.powerdns.com/mailman/listinfo/pdns-users 
> 


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Re: [Pdns-users] Spoof MX records

2018-12-14 Thread Aleksandr Rogozin via Pdns-users 
Hi Michael,

I recommend using Lua to intercept the DNS queries. Both dnsdist and
recursor should be able to support it. In Lua you can check for query type
to be MX and load a list of domains from a file using ‘io.open’. Provide
necessary DNS response if the query matches your list of zones.
Additionally, you might want to limit this operation to specific networks
with NetMask or NetMaskGroup.


On Fri, Dec 14, 2018 at 01:53 Bit World Computing - Michael Mertel <
michael.mer...@bwc.de> wrote:

> Hi,
>
> I’am looking for the most efficent way to spoof the answer of a MX query.
> I need to redirect outgoing e-mails (specific domains only) to a smtp
> gateway for further processing before it leaves the local network. I cannot
> use any kind of transport tables at the MTA, so my approach was to use dns
> therefore.
>
> The number of zones to spoof is currently not defined, could be dozens if
> not hundreds.
>
> I would usually do this kind of stuff with dnsdist (which I love), but
> would the recursor a better choice here?
>
> Thanks for any advice.
>
> —Michael
>
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[Pdns-users] Spoof MX records

2018-12-13 Thread Bit World Computing - Michael Mertel 
Hi,

I’am looking for the most efficent way to spoof the answer of a MX query. I 
need to redirect outgoing e-mails (specific domains only) to a smtp gateway for 
further processing before it leaves the local network. I cannot use any kind of 
transport tables at the MTA, so my approach was to use dns therefore.

The number of zones to spoof is currently not defined, could be dozens if not 
hundreds.

I would usually do this kind of stuff with dnsdist (which I love), but would 
the recursor a better choice here?

Thanks for any advice.

—Michael

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