libsodium.org DNSSEC Outage: 2018-04-03

Updated: April 3, 2018

Overview

This page gives some details on the libsodium.org DNSSEC outage on April 3, 2018. This is at least the 5th DNSSEC outage for libsodium.org.

Timeline / DNSViz

DNSSEC Debugger

Unlike DNSViz, Verisign's DNSSEC Debugger doesn't archive results, so here's a screenshot of my web browser's output from April 3, 2018:

April 3, 2018 libsodium.org DNSSEC unsigned

Google Public DNS: with and without DNSSEC

DNSSEC can be disabled in queries via the CD (checking disabled) bit. Let's compare DNS queries with and without DNSSEC. With DNSSEC, DNS queries result in SERVFAIL:

$ dig +dnssec a libsodium.org. @8.8.8.8

; <<>> DiG 9.4.2-P2 <<>> +dnssec a libsodium.org. @8.8.8.8
;; global options: printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 24967
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags: do; udp: 512
;; QUESTION SECTION:
;libsodium.org. IN A

;; Query time: 147 msec
;; SERVER: 8.8.8.8#53(8.8.8.8)
;; WHEN: Tue Apr 3 06:16:14 2018
;; MSG SIZE rcvd: 42

You have to disable DNSSEC to make DNS queries work:

$ dig +cd a libsodium.org. @8.8.8.8

; <<>> DiG 9.4.2-P2 <<>> +cd a libsodium.org. @8.8.8.8
;; global options: printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 59520
;; flags: qr rd ra cd; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;libsodium.org. IN A

;; ANSWER SECTION:
libsodium.org. 9999 IN A 37.59.238.213

;; Query time: 147 msec
;; SERVER: 8.8.8.8#53(8.8.8.8)
;; WHEN: Tue Apr 3 06:16:14 2018
;; MSG SIZE rcvd: 47

Zonemaster

drill trace

Since DNSSEC contains so much garbage, I put the complete drill trace into its own file with the relevant portion below (emphasis added). Note the DS at .org, but "no chain to a trusted key or ds record." See DNSViz for a graphical representation.

[T] libsodium.org. 86400 IN DS 33101 13 2 b37674f220b87eeda8cb124fb84315b37c6fdcd2931547e20aa8bedce455195a
;; Domain: libsodium.org.
;; Signature ok but no chain to a trusted key or ds record
[S] libsodium.org. 86400 IN DNSKEY 256 3 13 ;{id = 53970 (zsk), size = 256b}
libsodium.org. 86400 IN DNSKEY 257 3 13 ;{id = 52433 (ksk), size = 256b}
[S] libsodium.org. 10000 IN A 37.59.238.213
;;[S] self sig OK; [B] bogus; [T] trusted

Logfile examples