Am 15.01.2015 um 15:25 schrieb Frank Fiene <ffiene@veka.com>:

Am 15.01.2015 um 14:10 schrieb Michael Schwartzkopff <ms@sys4.de>:

Am Donnerstag, 15. Januar 2015, 13:46:39 schrieb Frank Fiene:

The „da" flag is missing!?

„ad"

Sigh, Apple ...

Am 15.01.2015 um 13:06 schrieb Patrick Ben Koetter <p@sys4.de>:

dig +dnssec dane.sys4.de <http://dane.sys4.de/>

root@mail:/home/ffiene# dig +dnssec dane.sys4.de +m

; <<>> DiG 9.9.5-3-Ubuntu <<>> +dnssec dane.sys4.de +m
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 53974
;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 4, ADDITIONAL: 5

Your resolver gets all the dnssec relevant RR of the domain, but does not
check if the RRSIG are really correct. Please check the same with a dnssec
enabled resolver. 8.8.8.8 for instance does check the signatures.

dig @8.8.8.8 +dnssec sys4.de

you will see, that the "ad" flag ist present in the answer.

Next step: Install a dnssec aware resolver.

On the other mailserver with no local DNS server (the other mailserver has a local DNS server which forwards to the same as this one):

root@mail1:/etc/postfix# dig +dnssec dane.sys4.de +m

; <<>> DiG 9.9.5-3ubuntu0.1-Ubuntu <<>> +dnssec dane.sys4.de +m

;; global options: +cmd

;; Got answer:

;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 42645

;; flags: qr rd ra ad; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 1

But still anonymous TLS connections only!

Frank

Mit freundlichen Grüßen,

Michael Schwartzkopff

--
[*] sys4 AG

http://sys4.de, +49 (89) 30 90 46 64, +49 (162) 165 0044
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Vorstand: Patrick Ben Koetter, Marc Schiffbauer
Aufsichtsratsvorsitzender: Florian Kirstein

Viele Grüße!
i.A. Frank Fiene
-- 
Frank Fiene

IT-Security Manager VEKA Group

Fon: +49 2526 29-6200
Fax: +49 2526 29-16-6200
mailto: ffiene@veka.com
http://www.veka.com

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Vorstand/Executive Board: Andreas Hartleif (Vorsitzender/CEO),
Dr. Andreas W. Hillebrand, Bonifatius Eichwald, Elke Hartleif, Dr. Werner Schuler,
Vorsitzender des Aufsichtsrates/Chairman of Supervisory Board: Ulrich Weimer
HRB 8282 AG Münster/District Court of Münster