Hi all, We use RPZ to block malicious domain names. Specifically, we redirect to a landing page. Our landing page (landingpage.ph.rpz.switch.ch) is DNSSEC signed. However, if I get a RPZ response from our validating dns resolver it omits any RRSIG. Example:
dig @<resolver> www.oyubaimai[.]top +dnssec ; <<>> DiG 9.11.0rc1 <<>> @<resolver> www.oyubaimai[.]top +dnssec ; (2 servers found) ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 52312 ;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 3, ADDITIONAL: 5 ;; OPT PSEUDOSECTION: ; EDNS: version: 0, flags: do; udp: 4096 ; COOKIE: 4442932ac258891044299f27585cf4bf66cb7f09a55cc096 (good) ;; QUESTION SECTION: ;www.oyubaimai[.]top. IN A ;; ANSWER SECTION: www.oyubaimai[.]top. 5 IN CNAME landingpage.ph.rpz.switch.ch. landingpage.ph.rpz.switch.ch. 86400 IN A 130.59.118.29 ;; AUTHORITY SECTION: switch.ch. 3463 IN NS nsa-p.dnsnode.net. switch.ch. 3463 IN NS ns2.switch.ch. switch.ch. 3463 IN NS scsnms.switch.ch. ;; ADDITIONAL SECTION: ns2.switch.ch. 3463 IN AAAA 2001:620:0:ff::2f scsnms.switch.ch. 3463 IN AAAA 2001:620:0:ff::a7 ns2.switch.ch. 3463 IN A 130.59.31.29 scsnms.switch.ch. 3463 IN A 130.59.31.26 Note, our BIND RPZ configuration does not use "break-dnssec yes" (it does not matter in this case). www.oyubaimai[.]top is not DNSSEC signed. landingpage.ph.rpz.switch.ch is DNSSEC signed. Our DNS resolvers are not only used by stub resolvers but by DNS resolvers using DNS forwarding as well. I wonder what happens if DNS forwarding resolvers do DNSSEC validation? It looks like they would return SERVFAIL to the user as the RPZ response omits any RRSIG for the landing page. Is this a BIND bug or a side effect of RPZ? As a work around, I could leave rpz.switch.ch unsigned to work around this problem. Daniel _______________________________________________ Please visit https://lists.isc.org/mailman/listinfo/bind-users to unsubscribe from this list bind-users mailing list bind-users@lists.isc.org https://lists.isc.org/mailman/listinfo/bind-users
