Our up-stream resolver (Akamai) is unable to validate
scra.dmdc.osd.mil, when my 9.18.28 BIND resolver is able to. I
think my BIND server is doing it correctly, and the Akamai
resolver is not.
The nice dnsviz visualizer
https://dnsviz.net/d/scra.dmdc.osd.mil/dnssec/ leads me to suspect
that Akamai is choking on the presence of the SHA-1 records
(rather than ignoring them and accepting the SHA-256 records).
My bench-check of the behavior of BIND appears correct to me, but
I'm seeking confirmation.
When I delv locally for that A-record, I find a CNAME,
another CNAME, and an A. My BIND resolver is able to validate all
of the responses.
When I ask the Akamai resolver, it chokes. Unfortunately, I can't
offer the query for anyone else to try, because AFAIK Akamai
doesn't have a publicly-accessible resolver. But this is what I
get when I +mtrace +vtrace :
;; fetch: scra.dmdc.osd.mil/A
;; received packet from 96.7.136.4#53
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id:
54760
;; flags: qr rd ra; QUESTION: 1, ANSWER: 1, AUTHORITY: 0,
ADDITIONAL: 0
;; QUESTION SECTION:
;scra.dmdc.osd.mil. IN A
;; ANSWER SECTION:
;scra.dmdc.osd.mil. 10 IN A 214.16.194.43
;; validating scra.dmdc.osd.mil/A: starting
;; validating scra.dmdc.osd.mil/A: attempting insecurity proof
;; validating scra.dmdc.osd.mil/A: checking existence of DS at
'mil'
;; fetch: mil/DS
;; received packet from 96.7.136.4#53
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id:
41961
;; flags: qr rd ra; QUESTION: 1, ANSWER: 1, AUTHORITY: 0,
ADDITIONAL: 0
;; QUESTION SECTION:
;mil. IN DS
;; ANSWER SECTION:
;mil. 86400 IN DS 16801 8 2 (
;
49013E5D5ED406C25C5A3E7F67C7
;
56E34C925342A34BD64D7427536C
; 366DF99A )
;; validating mil/DS: starting
;; validating mil/DS: attempting insecurity proof
;; validating mil/DS: checking existence of DS at 'mil'
;; validating mil/DS: continuing validation would lead to
deadlock: aborting validation
;; validating mil/DS: deadlock found (create_fetch)
;; no valid RRSIG resolving 'mil/DS/IN': 96.7.136.4#53
;; validating scra.dmdc.osd.mil/A: in fetch_callback_ds
;; validating scra.dmdc.osd.mil/A: fetch_callback_ds: got
SERVFAIL
;; broken trust chain resolving 'scra.dmdc.osd.mil/A/IN':
96.7.136.4#53
;; resolution failed: broken trust chain
--
--
Do things because you should, not just because you can.
John Thurston 907-465-8591
john.thurs...@alaska.gov
Department of Administration
State of Alaska
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