On Fri, Sep 30, 2011 at 10:26:34PM +0000, Raymond Drew Walker wrote:
> In our initial implementation of DNSSEC, we chose to try out the "auto"
> functionalities in version 9.8.0 P4 ie. using "auto-dnssec maintain" in
> all master zones.
>
> When going live, we found that though all zones that we are acting as
> master for would populate their own DS records, but there would be no
> population of a child zone's DS record in the corresponding parent master
> zone file.
>
> This means upon go-live, any DNSSEC validation of our children zones
> (X.nau.edu, Y.X.nau.edu etc.) would fail, though our root master zone
> (nau.edu) would validate fine.
>
> We have since backed out DNSSEC until we can get a resolution of the issue.
>
> After much research, I'm not sure why this is happening... Any suggestions
> or ideas?
I think there's something else going on here. If you have DNSKEY records in the
child but no DS in the parent, everything should still be okay - there's no
chain of trust, but there's also no assertion from the parent that there
*should be* a chain of trust (that's what the DS record does).
However, in this case I believe your problem is the lack of NS records in
nau.edu for extended.nau.edu. It's difficult to know for sure, but it appears
that the only signature for the NS RRSET is using the ZSK for extended.nau.edu,
not the ZSK for nau.edu.
In the olden days you could get away with that since the same servers are
authoritative for both zones, and they'd answer correctly. In the new world of
DNSSEC, if you ask for extended.nau.edu, you get this:
paperboy {owens}% dig +dnssec extended.nau.edu a
; <<>> DiG 9.9.0a2 <<>> +dnssec extended.nau.edu a
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 60942
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 6, ADDITIONAL: 1
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags: do; udp: 4096
;; QUESTION SECTION:
;extended.nau.edu. IN A
;; AUTHORITY SECTION:
ewb.nau.edu. 10199 IN RRSIG NSEC 5 3 86400 20111019222812
20110919220129 7485 nau.edu.
SfCIx42kzjbTV5sDH/OwIKGRRxfJaM8EgaX74/RbD+BJjJhP7o28dR1U
VHRuO6arK8FXF0vCIZ5lpqaWFRkaCwEftrjX3ktdWUNfhRlD9qqHF+cV
00icFXkasql9f8Yk9XgTeZ63CkH/8H9acjTuVlunqZDL1CVtaKTJfKKq uMs=
ewb.nau.edu. 10199 IN NSEC facdevnet.nau.edu. CNAME RRSIG
NSEC
nau.edu. 10199 IN SOA ns3.nau.edu.
DNS-Contact.nau.edu. 4779 1800 900 604800 86400
nau.edu. 10199 IN RRSIG SOA 5 2 86400 20111030191258
20110930181258 7485 nau.edu.
xoY5c8d+UnJfXA0ZZDv2Zz5tht4ZspTOeGvEGcQr+XIOMH39krpWR6T9
fUy5O/XnURz5nDGWR4QIKQMgAu+qfyGzA9Yzb5S5CkAWd4IDjKmznrXI
G3beth9Dcr/fJxusMxGuhZWZftQBrHBn14Wqx8YKOOIwQZx/PSm8XONA tHc=
nau.edu. 10199 IN RRSIG NSEC 5 2 86400 20111020001752
20110919233312 7485 nau.edu.
GizWBgmH1B7n0TuBjRgUEiu0XOCvrncyKR1iSSWJIrWKn4aZ9djBazdP
/JEWGY73IIZ4j/i3yO6MSw1gJRe0ane3lZjpHFnFdaPPEcYHVWy3h7Zk
UccnBd0ggkkLrHoG/CbRoVrF+90CDJymeAnYcWDycKQW84cNibj/tXxb CRk=
nau.edu. 10199 IN NSEC _tcp.nau.edu. A NS SOA MX TXT
RRSIG NSEC DNSKEY TYPE65534
No records, so no delegation, so nowhere to go to get the A record (which is
actually configured).
As for BIND automatically populating DS records, I don't even know whether
that's a feature. Is it in the docs? I don't remember seeing it, but it's a big
manual and I might have missed that reference. . .
Bill.
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