DNS CAA records...

Mark Andrews marka at isc.org
Wed Jan 18 03:39:02 UTC 2017


Or use up-to-date code.  CAA support was added in BIND 9.8.8 (already
end of lifed), BIND 9.9.6, BIND 9.10.1 and BIND 9.11.0.

[rock:~/git/bind9] marka% dig caa google.com
;; BADCOOKIE, retrying.

; <<>> DiG 9.12.0-pre-alpha+hotspot+add-prefetch+marka <<>> caa google.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 42490
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
; COOKIE: 5f52c5d222feb5c9583cb70c587ee11a8f16c403c5fdbbd5 (good)
;; QUESTION SECTION:
;google.com.			IN	CAA

;; ANSWER SECTION:
google.com.		86400	IN	CAA	0 issue "symantec.com"

;; Query time: 192 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Wed Jan 18 14:29:30 EST 2017
;; MSG SIZE  rcvd: 98

[rock:~/git/bind9] marka% 

Anyway this is a good real life example of how you can add new types
and have them be looked up without having to update the servers or
the clients.  "dig TYPE257 google.com" would have also worked.

Mark


In message <ae662f474afc41b184c821af0e38b5ac at RACKSPACE.COM>, Nolan Berry writes:
> So a quick look into this I see one potential real world example:
>
>
> ;; ANSWER SECTION:
> google.com.        129    IN    A    216.58.218.142
> google.com.        74411    IN    NS    ns4.google.com.
> google.com.        74411    IN    NS    ns1.google.com.
> google.com.        74411    IN    NS    ns2.google.com.
> google.com.        74411    IN    NS    ns3.google.com.
> google.com.        3054    IN    TXT    "v=spf1 include:_spf.google.com
> ~all"
> google.com.        64    IN    AAAA    2607:f8b0:4000:802::200e
> google.com.        54475    IN    TYPE257    \# 19
> 0005697373756573796D616E7465632E636F6D
>
>
> In RFC 6844 section 7.1 it states
>
>
> "IANA has assigned Resource Record Type 257 for the CAA Resource Record
> Type"
>
>
> and I am seeing:
>
>
> google.com.        54475    IN    TYPE257    \# 19 0005697373756573796D616E7465632E636F6D
>
>
>
> Nolan Berry
>
> Linux Systems Engineer
>
> DNS Engineering
>
> Rackspace Hosting
>
> ________________________________
> From: NANOG <nanog-bounces at nanog.org> on behalf of Eric Tykwinski
> <eric-list at truenet.com>
> Sent: Tuesday, January 17, 2017 6:04:31 PM
> To: nanog list
> Subject: DNS CAA records...
>
> So I've come across this on Qualys and just wondering if there's any
> practical examples out there in the wild.
> I know some BIND guys are on here, so I'm sure I'm missing something from
> the RFCs.
> Just wanted to test this out on my play domains before putting it out in
> the wild...
>
> Sincerely,
>
> Eric Tykwinski
> TrueNet, Inc.
> P: 610-429-8300
>

-- 
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: marka at isc.org


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