mailcow/docs/first_steps.md

# 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!

1\. Get the certbot client:
```
wget https://dl.eff.org/certbot-auto -O /usr/local/sbin/certbot && chmod +x /usr/local/sbin/certbot
```

2\. Make sure you set `HTTP_BIND=0.0.0.0` in `mailcow.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
```

3\. 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
```
    
4\. 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
```

5\. 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.

1\. Generate a Rspamd controller password hash:
```
docker-compose exec rspamd-mailcow rspamadm pw
```

2\. Replace the default hash in `data/conf/rspamd/override.d/worker-controller.inc` by your newly generated:
```
enable_password = "myhash";
```

3\. 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.

1\. 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`.

2\. 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;
    }
    [...]
}
```