LetsEncrypt Wildcards (Ubuntu 18.04)

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rfc2136

Installation

sudo apt-get install -y certbot python-certbot-apache python3-certbot-dns-rfc2136

Konfiguration

PowerDNS

sudo vi /etc/powerdns/pdns.conf

dnsupdate=yes
allow-dnsupdate-from=0.0.0.0/0,::0

Datenbank

insert into domainmetadata(domain_id, kind, content) values((select id from domains where name='example.org'), 'SOA-EDIT-DNSUPDATE','INCREASE');

insert into domainmetadata(domain_id, kind, content) values((select id from domains where name='example.org'), 'ALLOW-DNSUPDATE-FROM','0.0.0.0/0');

sudo pdnsutil generate-tsig-key certbot hmac-sha512

insert into tsigkeys (name, algorithm, secret) values ('certbot', 'hmac-sha512', 'FYhvwsW1ZtFZqWzsMpqhbg==');

insert into domainmetadata (domain_id, kind, content) values ((select id from domains where name='example.org'), 'TSIG-ALLOW-DNSUPDATE', 'certbot');

insert into domainmetadata (domain_id, kind, content) values ((select id from domains where name='0.0.10.in-addr.arpa'), 'TSIG-ALLOW-DNSUPDATE', 'certbot');

Test

nsupdate <<!
server 127.0.0.1 5300
zone dynamic-dns.at
update add _test.example.org. 60 IN TXT "test"
key hmac-sha512:certbot FYhvwsW1ZtFZqWzsMpqhbg==
send
!

Links

https://certbot.eff.org/lets-encrypt/debianbuster-apache

Certbot

sudo mkdir /opt/certbot
sudo vi /opt/certbot/rfc2136.ini
sudo chmod 600 /opt/certbot/rfc2136.ini

# Target DNS server
dns_rfc2136_server = 127.0.0.1
# Target DNS port
dns_rfc2136_port = 5300
# TSIG key name
dns_rfc2136_name = certbot.
# TSIG key secret
dns_rfc2136_secret = FYhvwsW1ZtFZqWzsMpqhbg==
# TSIG key algorithm
dns_rfc2136_algorithm = HMAC-SHA512

sudo certbot certonly \
  --dns-rfc2136 \
  --dns-rfc2136-credentials /opt/certbot/rfc2136.ini \
  --dns-rfc2136-propagation-seconds 60 \
  -d example.com \
  -d dns1.example.com \
  -d *.dns1.example.com \
  -d poweradmin1.example.org

Links

https://certbot-dns-rfc2136.readthedocs.io/en/stable/

Renew

Laut sudo vi /etc/cron.d/certbot läuft auf systemd basierten Systemen, der Timer zum Update:

sudo systemctl list-timers

Links Allgemein

https://bbs.archlinux.org/viewtopic.php?id=240847

https://doc.powerdns.com/authoritative/dnsupdate.html

https://wiki.archlinux.org/index.php/Certbot

Docker

Um das certbot/dns-nsone-Image zu benützen, folgenden Befehl ausführen:

sudo docker run -it --rm --name certbot \
            -v "/etc/letsencrypt:/etc/letsencrypt" \
            -v "/var/lib/letsencrypt:/var/lib/letsencrypt" \
            certbot/dns-nsone certonly

Links

https://certbot.eff.org/docs/install.html#running-with-docker

https://hub.docker.com/u/certbot

https://medium.com/faun/docker-letsencrypt-dns-validation-75ba8c08a0d

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