BIND : DNS over HTTPS : Server Settings2022/11/18

	Configure DNS over HTTPS Server on BIND.
[1]	Get SSL/TLS certificate, refer to here.
[2]	Configure BIND.

[root@dlp ~]#

openssl dhparam -out /var/named/dhparam.pem 3072

[root@dlp ~]#

cp /etc/letsencrypt/live/dlp.srv.world/{fullchain.pem,privkey.pem} /var/named/

[root@dlp ~]#

chown named:named /var/named/{fullchain.pem,privkey.pem,dhparam.pem}

[root@dlp ~]#

vi /etc/named.conf

# add settings for certificate
tls local-tls {
        key-file "/var/named/privkey.pem";
        cert-file "/var/named/fullchain.pem";
        dhparam-file "/var/named/dhparam.pem";
        ciphers "HIGH:!kRSA:!aNULL:!eNULL:!RC4:!3DES:!MD5:!EXP:!PSK:!SRP:!DSS:!SHA1:!SHA256:!SHA384";
        prefer-server-ciphers yes;
        session-tickets no;
};

http local {
    endpoints { "/dns-query"; };
};

options {
        # change like follows
        listen-on tls local-tls http local { any; };
        listen-on-v6 tls local-tls http local { any; };
        directory       "/var/named";
        dump-file       "/var/named/data/cache_dump.db";
.....
.....

[root@dlp ~]#

systemctl restart named

[3]	If SELinux is enabled, change policy.

[root@dlp ~]#

setsebool -P named_tcp_bind_http_port on

[4]	If Firewalld is running, allow service ports.

[root@dlp ~]#

firewall-cmd --add-service={http,https}

success
[root@dlp ~]#

firewall-cmd --runtime-to-permanent

success

[5]	Verify Name Resolution with HTTPS on localhost.

[root@dlp ~]#

dig +https @127.0.0.1 dlp.srv.world.


; <<>> DiG 9.18.8 <<>> +https @127.0.0.1 dlp.srv.world.
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 42721
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 1232
; COOKIE: ca9dc8e48f1f69e00100000063773a59620e99eea1cb68b9 (good)
;; QUESTION SECTION:
;dlp.srv.world.                 IN      A

;; ANSWER SECTION:
dlp.srv.world.          86400   IN      A       10.0.0.30

;; Query time: 0 msec
;; SERVER: 127.0.0.1#443(127.0.0.1) (HTTPS)
;; WHEN: Fri Nov 18 16:55:05 JST 2022
;; MSG SIZE  rcvd: 86

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