3.9 KiB
SSL (and: How to use Let's Encrypt)
mailcow dockerized comes with a snakeoil CA "mailcow" and a server certificate in data/assets/ssl
. Please use your own trusted certificates.
mailcow uses 3 domain names that should be covered by your new certificate:
- ${MAILCOW_HOSTNAME}
- autodiscover.example.org
- autoconfig.example.org
Obtain multi-SAN certificate by Let's Encrypt
This is just an example of how to obtain certificates with certbot. There are several methods!
- Get the certbot client:
wget https://dl.eff.org/certbot-auto -O /usr/local/sbin/certbot && chmod +x /usr/local/sbin/certbot
-
Make sure you set
HTTP_BIND=0.0.0.0
inmailcow.conf
or setup a reverse proxy to enable connections to port 80. If you changed HTTP_BIND, then restart Nginx:docker-compose restart nginx-mailcow
. -
Request the certificate with the webroot method:
cd /path/to/git/clone/mailcow-dockerized
source mailcow.conf
certbot certonly \
--webroot \
-w ${PWD}/data/web \
-d ${MAILCOW_HOSTNAME} \
-d autodiscover.example.org \
-d autoconfig.example.org \
--email you@example.org \
--agree-tos
- Create hard links to the full path of the new certificates. Assuming you are still in the mailcow root folder:
mv data/assets/ssl/cert.{pem,pem.backup}
mv data/assets/ssl/key.{pem,pem.backup}
ln $(readlink -f /etc/letsencrypt/live/${MAILCOW_HOSTNAME}/fullchain.pem) data/assets/ssl/cert.pem
ln $(readlink -f /etc/letsencrypt/live/${MAILCOW_HOSTNAME}/privkey.pem) data/assets/ssl/key.pem
- Restart affected containers:
docker-compose restart postfix-mailcow dovecot-mailcow nginx-mailcow
When renewing certificates, run the last two steps (link + restart) as post-hook in a script.
Rspamd Web UI
At first you may want to setup Rspamds web interface which provides some useful features and information.
- Generate a Rspamd controller password hash:
docker-compose exec rspamd-mailcow rspamadm pw
- Replace the default hash in
data/conf/rspamd/override.d/worker-controller.inc
by your newly generated:
enable_password = "myhash";
- Restart rspamd:
docker-compose restart rspamd-mailcow
Open https://${MAILCOW_HOSTNAME}/rspamd in a browser and login!
Optional: Reverse proxy
You don't need to change the Nginx site that comes with mailcow: dockerized. mailcow: dockerized trusts the default gateway IP 172.22.1.1 as proxy. This is very important to control access to Rspamd's web UI.
Make sure you change HTTP_BIND and HTTPS_BIND in mailcow.conf
to a local address and set the ports accordingly, for example:
HTTP_BIND=127.0.0.1
HTTP_PORT=8080
HTTPS_PORT=127.0.0.1
HTTPS_PORT=8443
Recreate affected containers by running docker-compose up -d
.
Configure your local webserver as reverse proxy:
Apache 2.4
<VirtualHost *:443>
ServerName mail.example.org
ServerAlias autodiscover.example.org
ServerAlias autoconfig.example.org
[...]
# You should proxy to a plain HTTP session to offload SSL processing
ProxyPass / http://127.0.0.1:8080
ProxyPassReverse / http://127.0.0.1:8080
ProxyPreserveHost On
your-ssl-configuration-here
[...]
# If you plan to proxy to a HTTPS host:
#SSLProxyEngine On
# If you plan to proxy to an untrusted HTTPS host:
#SSLProxyVerify none
#SSLProxyCheckPeerCN off
#SSLProxyCheckPeerName off
#SSLProxyCheckPeerExpire off
</VirtualHost>
Nginx
server {
listen 443;
server_name mail.example.org autodiscover.example.org autoconfig.example.org;
[...]
your-ssl-configuration-here
location / {
proxy_pass http://127.0.0.1:8080;
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-Forwarded-Proto $scheme;
}
[...]
}