[dns-operations] Quad9 denial of existence for _25._tcp.mx1.p01.antagonist.nl IN TLSA

[Martijn Reening]

Hello Viktor,

We haven't changed anything on our side in the past days, but I see the expected response from Quad9 now:

$ dig +dnssec +noall +comment +ans +auth -t tlsa _25._tcp.mx1.p01.antagonist.nl @9.9.9.10
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 17089
;; flags: qr rd ra ad; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags: do; udp: 512
;; ANSWER SECTION:
_25._tcp.mx1.p01.antagonist.nl.    300 IN    TLSA    2 1 1 E12D92CF8D801D0FDB21BEDEE1CEC09C15AC2A61E27FA27D6B151312 D2206520
_25._tcp.mx1.p01.antagonist.nl.    300 IN    RRSIG    TLSA 13 6 300 20191205000000 20191114000000 47684 antagonist.nl. XDMVKwb3MHIwGpRd/sCctO2Jy+VyqdVbmsHnmyhtOwB0WiZ7a73WAFat 6QOmM53ty4Q6YjpBb+lIHInFR8BAjQ==

I checked our nameservers for the proper ENT responses and there do not seem to be any abnormalities.
Do you still see this error, or perhaps know something else to check?

On 26/11/2019 05:27, Viktor Dukhovni wrote:
>
> According DNSViz, and the Cloudflare, Google and Verisign public resolvers the
> qname below has a TLSA record, but Quad returns an apparently valid denial of
> existence.  It is possible that Quad9 is "the guilty party" here only by
> accident, and had I asked at another time, some other server would return the
> unexpected denial of existence.
>
> No idea where the associated RRSIGs and NSEC3 records are coming from.  Perhaps
> there are some nameservers (reached via Quad9) for antagonist.nl that have a
> zone file in which the empty-non-terminal "_tcp" is missing...
>
>     $ dig +dnssec +noall +comment +ans +auth -t tlsa _25._tcp.mx1.p01.antagonist.nl @9.9.9.10
>     ;; Got answer:
>     ;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 10642
>     ;; flags: qr rd ra ad; QUERY: 1, ANSWER: 0, AUTHORITY: 8, ADDITIONAL: 1
>
>     ;; OPT PSEUDOSECTION:
>     ; EDNS: version: 0, flags: do; udp: 512
>     ;; AUTHORITY SECTION:
>     antagonist.nl.          180     IN      SOA     ns1.antagonist.nl. hostmaster.antagonist.nl. 2018052300 180 3600 1209600 86400
>     cueh7hkbnbrqk65590909p4r0pq6cd45.antagonist.nl. 43200 IN NSEC3 1 0 1 AB D04COHDERT50P43FHSP1N5F7LDVTORH7 A AAAA RRSIG
>     i33uq5toep0fslekf0mqpnv6pb6s002e.antagonist.nl. 43200 IN NSEC3 1 0 1 AB IDTV8EDH9FRO5UU2OC4N3PUM51SRLDGH A RRSIG
>     g7u4gpdfmf579evnnqmc3v816rafktip.antagonist.nl. 43200 IN NSEC3 1 0 1 AB GFL0IAO83UJDAA6IHCTHFGL6T4KNILQO A RRSIG
>     antagonist.nl.          180     IN      RRSIG   SOA 13 2 180 20191205000000 20191114000000 47684 antagonist.nl. TjahhD+sFLbHkIAUcUFFo+vC4icQKK2Zh+74BN+eFQ9JhkZaQ6AMYNbT wGfDZuNntzd2C3FS4SiIptAr6fOkvA==
>     cueh7hkbnbrqk65590909p4r0pq6cd45.antagonist.nl. 86400 IN RRSIG NSEC3 13 3 86400 20191205000000 20191114000000 47684 antagonist.nl. 5KPt3wExlfKg4tZJ1fdR1xhnj8x8DsmgYR2+pCHkcc041thw3E6jQCfY CESVytcQcp6Zb/uJ3zxNXExJkEzZoQ==
>     i33uq5toep0fslekf0mqpnv6pb6s002e.antagonist.nl. 86400 IN RRSIG NSEC3 13 3 86400 20191205000000 20191114000000 47684 antagonist.nl. Wrzps6dY9zhq14kBiFp0KwDqdkMtceOMV2cMKPkznhxFcsmpsTazZX1Z MAw/565cRwpWRoU5LuGNzGHg3ZstUQ==
>     g7u4gpdfmf579evnnqmc3v816rafktip.antagonist.nl. 86400 IN RRSIG NSEC3 13 3 86400 20191205000000 20191114000000 47684 antagonist.nl. DBJvz7HbYSFS/PHtTXD2qMwsKuWXoqNj8MPNMIk84Jv4kY1w52EevWIS nIgDknp9DbzYcczQzOOu1cyEYulYPg==
>
>     6d1aa3h9jtqjdp0vjblqej9e17ub81hs. _25._tcp.mx1.p01.antagonist.nl
>     v3rrfku7an9uo5qeuhbdndnruhp9esar. *._tcp.mx1.p01.antagonist.nl
>     i9sp4p909spoci68n9q0r33hk9fes0n4. _tcp.mx1.p01.antagonist.nl    (Covered)
>     g90cq1j49b7nkrom5lcojqals2gittit. *.mx1.p01.antagonist.nl       (Covered)
>     cueh7hkbnbrqk65590909p4r0pq6cd45. mx1.p01.antagonist.nl         (Covered, closest encloser)
>     sac7gh66m6avf55q05gbfhh91a48hstf. *.p01.antagonist.nl
>     iupnvfafqalai3eke44m2vi4vr89lgpk. p01.antagonist.nl
>     83jtudmler6j6tailr1f6hktosq1mvc4. *.antagonist.nl
>     29eiirrkt62jjrrigm5ouurhdt4p682u. antagonist.nl
>

-- 
Kind regards,
Met vriendelijke groet,

Martijn Reening
Systems and Network Engineer