Am Sa., 9. Apr. 2022 um 10:57 Uhr schrieb Otto Moerbeek <o...@drijf.net>:
> On Sat, Apr 09, 2022 at 10:37:19AM +0200, Jeff Bread wrote: > > > Am Sa., 9. Apr. 2022 um 09:52 Uhr schrieb Jeff Bread <jbrea...@gmail.com > >: > > > > > > > > > > > > > > Am Sa., 9. Apr. 2022 um 09:24 Uhr schrieb Jeff Bread < > jbrea...@gmail.com>: > > > > > >> > > >> > > >> Am Sa., 9. Apr. 2022 um 09:05 Uhr schrieb Otto Moerbeek < > o...@drijf.net>: > > >> > > >>> On Sat, Apr 09, 2022 at 08:42:24AM +0200, Jeff Bread via Pdns-users > > >>> wrote: > > >>> > > >>> > Hi, > > >>> > > > >>> > I am new to powerdns and wanted to implement a kind of extended > > >>> sinkhole by > > >>> > whitelisting some domains by using a RPZ file. > > >>> > > > >>> > The aim is > > >>> > > > >>> > - to allow only certain domain(s) for a certain IP but drop all > other > > >>> > domains > > >>> > - and allow all domains for all other clients > > >>> > > > >>> > The rpz is quite simple > > >>> > > > >>> > example.net <http://microsoft.com>. CNAME > > >>> rpz-passthru. ; > > >>> > allow for all including 192.168.16.100 > > >>> > *.example.net <http://microsoft.com> CNAME > > >>> rpz-passthru. ; > > >>> > allow for all including 192.168.16.100 > > >>> > > > >>> > 32.100.16.168.192.rpz-client-ip CNAME rpz-drop. ; drop every > other > > >>> > request for 192.168.16.100 > > >>> > > > >>> > 0.0.0.0.0.rpz-client-ip CNAME rpz-passthru. ; allow all > domains > > >>> for > > >>> > all other clients > > >>> > > > >>> > This works perfect unless an allowed client resolves a records > > >>> forbidden > > >>> > for 192.168.16.100 as afterwards this record is answered from the > > >>> cache for > > >>> > 192.168.16.100. > > >>> > > > >>> > I already saw discussions on the precendes of cached records like > > >>> > > > >>> > https://www.mail-archive.com/pdns-users@mailman.powerdns.com/msg10763.html > > >>> > > > >>> > However the solution to disable caching via > > >>> > > > >>> > https://docs.powerdns.com/recursor/lua-scripting/dq.html#DNSQuestion.variable > > >>> > for certain records is in a blacklisting scenario workable but not > in a > > >>> > whitelisting like scenario as above. It would mean that I would > need to > > >>> > disable caching for all records but the the whitelisted ones. > > >>> > > > >>> > Is there a solution for my scenario let me still utilize caching? > > >>> > > > >>> > Thanks > > >>> > > >>> The Lua gettag() and gettag_ffi() [1] functions can be used to set a > > >>> packet cache tag which effectively partitions the PC into separate > > >>> instances based on the tag. If you set a tag based on the client's IP > > >>> address--dividing them up in groups that share a policy--you should > be > > >>> able achieve the desired effect: different PC instances per client > > >>> group. > > >>> > > >>> -Otto > > >>> > > >>> [1] > https://docs.powerdns.com/recursor/lua-scripting/hooks.html#gettag > > >> > > >> > > >> Many thanks. Indeed this seems to be the solution I was looking for. > Will > > >> try it our and report back. > > >> > > >> Jeff > > >> > > >> > > > > > > I started with a basic config to get a log entry however it seems as if > > > the gettag hook is not triggered. > > > > > > -- this check is applied before the packet cache has been looked up > > > function gettag (remote, ednssubnet, vlocal, qname, qtype) > > > pdnslog("gettag -- remote: "..remote.." - ednssubnet: > "..ednssubnet.." - > > > local: "..vlocal.." - qname: "..qname.." - qtype: "..qtype.." - > policytags: > > > "..policytags) > > > return 0 > > > end > > > > > > In my research I did also not found a working example script. > > > > > > > Switched to version 4.4 (I am testing on a raspi stretch) and played a > bit > > with the logging > > > > function gettag(remote, ednssubnet, localip, qname, qtype, ednsoptions, > > tcp, proxyprotocolvalues) > > pdnslog("Danger: gettag called") > > pdnslog("gettag -- remote: "..remote) > > > > First pdnslog creates a syslog entry, so gettag function is triggered and > > called however 2nd pdnslog does not create an entry for whatever unknown > > reason. Tried also with other parameters.... > > remote is a ComboAddress. To print it you'll need remote:toString(). > This is documented in the links I posted earlier. Your logs should > contain an exception logged for this, unless surpessed. Check if > log-common-errors is set to "yes". > > There is no complete example of gettag in the docs, see [1] . You can > get some inspiration from the regression test code found in [2]. > > -Otto > > [1] https://github.com/PowerDNS/pdns/issues/4697 > [2] > https://github.com/PowerDNS/pdns/blob/master/regression-tests.recursor-dnssec/t$ > > This seems to be quite advanced lua scripting I guess, well .. at least it is for me. My understanding of going through the docs is that I need to somehow utilize the edns-padding-tag though not really sure.
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