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mail-hosting-mirror/README.md
Daniel Winzen c262dbbe9d
Add information on improving domain security
2024-06-07 18:21:13 +02:00

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General Information:
--------------------
This is a setup for a Tor based email hosting server. It is provided as is and before putting it into production you should make changes according to your needs. This is a work in progress and you should carefully check the commit history for changes before updating.
Installation Instructions:
--------------------------
### Primary mail server with Tor:
Uninstall packages that may interfere with this setup:
```
DEBIAN_FRONTEND=noninteractive apt-get purge -y apache2* dnsmasq* eatmydata exim4* imagemagick-6-common mysql-client* mysql-server* nginx* libnginx-mod* php7* resolvconf && systemctl disable systemd-resolved.service && systemctl stop systemd-resolved.service
```
If you have problems resolving hostnames after this step, temporarily switch to a public nameserver like 1.1.1.1 (from CloudFlare) or 8.8.8.8 (from Google)
```
rm /etc/resolv.conf && echo "nameserver 1.1.1.1" > /etc/resolv.conf
```
Install git and clone this repository
```
apt-get update && apt-get install git -y && git clone https://github.com/DanWin/mail-hosting && cd mail-hosting
```
Install files and programs
```
./install_binaries.sh
```
Copy (and modify according to your needs) the site files in `etc` to `/etc` after installation has finished. Then restart some services:
```
systemctl daemon-reload && systemctl restart tor@default.service
```
Replace the default .onion domain with your domain:
```
sed -i "s/danielas3rtn54uwmofdo3x2bsdifr47huasnmbgqzfrec5ubupvtpid.onion/`cat /var/lib/tor/hidden_service/hostname`/g" /etc/prosody/prosody.cfg.lua /etc/nginx/sites-enabled/mail /var/www/mail/common_config.php /etc/postfix/main.cf
```
Replace the default clearnet domain with your domain:
```
sed -i "s/danwin1210.de/YOUR_DOMAIN/g" /etc/prosody/prosody.cfg.lua /etc/postfix/main.cf /etc/dovecot/dovecot.conf /etc/nginx/sites-enabled/* /var/www/mail/common_config.php /var/www/mail/www/squirrelmail/config/config.php
```
Create a mysql users and databases:
```
mysql
CREATE DATABASE postfix;
CREATE DATABASE prosody;
CREATE USER 'postfix'@'%' IDENTIFIED BY 'MY_PASSWORD';
CREATE USER 'postfix_readonly'@'%' IDENTIFIED BY 'MY_PASSWORD';
CREATE USER 'prosody'@'%' IDENTIFIED BY 'MY_PASSWORD';
GRANT ALL PRIVILEGES ON postfix.* TO 'postfix'@'%';
GRANT SELECT ON postfix.* TO 'postfix_readonly'@'%';
GRANT ALL PRIVILEGES ON prosody.* TO 'prosody'@'%';
FLUSH PRIVILEGES;
quit
```
Then update the passwords you've set in your configuration files:
```
nano /etc/dovecot/dovecot-dict-sql.conf.ext /etc/dovecot/dovecot-sql.conf.ext /etc/postfix/sql/mysql_* /etc/prosody/prosody.cfg.lua /var/www/mail/common_config.php
```
Generate a keypair for rspamd with `rspamadm keypair gen` and add it to /etc/rspamd/local.d/worker-fuzzy.inc, add the public encryption key to /etc/rspamd/override.d/fuzzy_check.conf
Set a password for the web interface with `rspamadm pw` and add the hash for it to /etc/rspamd/override.d/worker-controller.inc
Generate DKIM signing keys and add them to /etc/rspamd/local.d/arc.conf /etc/rspamd/local.d/dkim_signing.conf, then add the printed DNS records to your domain:
```
rspamadm dkim_keygen -d YOUR_DOMAIN -s $(date +"%Y%m%d")-rsa -b 4096 -t rsa -k /var/lib/rspamd/dkim/YOUR_DOMAIN-rsa
rspamadm dkim_keygen -d YOUR_DOMAIN -s $(date +"%Y%m%d")-ed25519 -t ed25519 -k /var/lib/rspamd/dkim/YOUR_DOMAIN-ed25519
```
Create a password used for your TURN server and replace all `YOUR_SECRET` in `/etc/prosody/prosody.cfg.lua` with it.
Install [acme.sh](https://github.com/acmesh-official/acme.sh) or [certbot](https://certbot.eff.org/) to obtain a free letsencrypt SSL certificate, then update the path to this new certificate in the following files:
```
nano /etc/prosody/prosody.cfg.lua /etc/dovecot/dovecot.conf /etc/postfix/main.cf /etc/nginx/nginx.conf /etc/nginx/sites-enabled/mail /etc/nginx/sites-enabled/openpgpkey
```
Add your other servers IP under `unrestricted access to these IPs` in `/etc/rc.local`
Create database tables, activate firewall and enable cron:
```
postmap /etc/postfix/header_checks
cd /var/www/mail && php setup.php && chmod +x /etc/rc.local && /etc/rc.local && systemctl enable mail-cron.timer
```
Generate a wireguard keypair and add the public key generated here to the primary mail server wireguard config:
```
export PRIV=$(wg genkey)
sed -i "s~YOUR_PRIVATE_KEY~$PRIV~g" /etc/wireguard/wg0.conf
echo $PRIV | wg pubkey
```
Replace `YOUR_IP` with the IP of your other server, then enable and start wireguard:
```
nano /etc/wireguard/wg0.conf
systemctl enable wg-quick@wg0 && systemctl start wg-quick@wg0
```
Final step is to reboot the server and check that everything is working.
### Proxy server:
To send emails to the regular internet, it is necessary to have a static IP to retain a reputation with an IP+Domain mapping. If you try sending via Tor, your emails will most certainly get blocked by spam filters. For this reason we need to setup a proxy server which will hold no user data itself, but simply act as a gateway to reach the less anonymous part of the internet.
Uninstall packages that may interfere with this setup:
```
DEBIAN_FRONTEND=noninteractive apt-get purge -y apache2* dnsmasq* eatmydata exim4* imagemagick-6-common mysql-client* mysql-server* nginx* libnginx-mod* php7* resolvconf && systemctl disable systemd-resolved.service && systemctl stop systemd-resolved.service
```
If you have problems resolving hostnames after this step, temporarily switch to a public nameserver like 1.1.1.1 (from CloudFlare) or 8.8.8.8 (from Google)
```
rm /etc/resolv.conf && echo "nameserver 1.1.1.1" > /etc/resolv.conf
```
Install git and clone this repository
```
apt-get update && apt-get install git -y && git clone https://github.com/DanWin/mail-hosting && cd mail-hosting
```
Install files and programs
```
./install_binaries_proxy.sh
```
Copy (and modify according to your needs) the site files in `etc_clearnet_proxy` to `/etc` after installation has finished.
Add the password for your TURN server you created for prosody in the main server and replace `YOUR_AUTH_SECRET` in `/etc/turnserver.conf` with it.
Install [acme.sh](https://github.com/acmesh-official/acme.sh) or [certbot](https://certbot.eff.org/) to obtain a free letsencrypt SSL certificate, then update the path to this new certificate in the following files:
```
nano /etc/postfix/main.cf /etc/nginx/nginx.conf /etc/turnserver.conf
```
Replace `YOUR_PASSWORD` in `/etc/postfix/sql/mysql_tls_policy_out.cf` with the one you've generated previously on the other server.
Generate a wireguard keypair and add the public key generated here to the primary mail server wireguard config:
```
export PRIV=$(wg genkey)
sed -i "s~YOUR_PRIVATE_KEY~$PRIV~g" /etc/wireguard/wg0.conf
echo $PRIV | wg pubkey
```
Replace `YOUR_IP` with the IP of your other server and `ens3` with your network interface name, then enable and start wireguard:
```
nano /etc/wireguard/wg0.conf
systemctl enable wg-quick@wg0 && systemctl start wg-quick@wg0
```
Edit and create your admin user with the following script:
```
nano /var/www/mail/tools/create_admin.php
php /var/www/mail/tools/create_admin.php
```
Copy the file `/etc/postfix/danwin1210-mail.crt` from your main server to the same location on the proxy server.
Final step is to reboot the server and check that everything is working.
### General Domain settings
Add the following DNS records to your domain, with the IPs of your proxy server:
```
@ IN TXT "v=spf1 ip4:your.ip.v4.address ip6:your:ip:v6:address -all"
_dmarc IN TXT "v=DMARC1;p=quarantine;adkim=r;aspf=r;fo=1;rua=mailto:postmaster@yourdomain;ruf=mailto:postmaster@yourdomain;rf=afrf;ri=86400;pct=100"
_adsp._domainkey IN TXT "dkim=all;"
_domainkey IN TXT "o=-;r=postmaster@yourdomain"
*._report._dmarc IN TXT "v=DMARC1"
_mta-sts IN TXT "v=STSv1; id=2024060601"
_smtp._tls IN TXT "v=TLSRPTv1; rua=mailto:postmaster@yourdomain"
_imaps._tcp IN SRV 0 0 993 yourdomain.
_submission._tcp IN SRV 0 0 465 yourdomain.
@ IN MX 0 yourdomain.
@ IN A your.ip.v4.address
@ IN AAAA your:ip:v6:address
www IN A your.ip.v4.address
www IN AAAA your:ip:v6:address
mta-sts IN A your.ip.v4.address
mta-sts IN AAAA your:ip:v6:address
conference IN A your.ip.v4.address
conference IN AAAA your:ip:v6:address
proxy IN A your.ip.v4.address
proxy IN AAAA your:ip:v6:address
upload IN A your.ip.v4.address
upload IN AAAA your:ip:v6:address
_xmpp-server._tcp.conference IN SRV 5 0 5269 yourdomain.
_xmpp-server._tcp.conference IN SRV 0 0 5269 your_onion_domain.
_xmpp-client._tcp IN SRV 5 0 5222 yourdomain.
_xmpp-client._tcp IN SRV 0 0 5222 your_onion_domain.
_xmpps-client._tcp IN SRV 5 0 5223 yourdomain.
_xmpps-client._tcp IN SRV 0 0 5223 your_onion_domain.
_xmpp-server._tcp IN SRV 5 0 5269 yourdomain.
_xmpp-server._tcp IN SRV 0 0 5269 your_onion_domain.
_stun._udp IN SRV 0 0 3478 yourdomain.
_turn._udp IN SRV 0 0 3478 yourdomain.
_stun._tcp IN SRV 0 0 3478 yourdomain.
_stuns._tcp IN SRV 0 0 3479 yourdomain.
_turn._tcp IN SRV 0 0 3478 yourdomain.
_turns._tcp IN SRV 0 0 5349 yourdomain.
_xmppconnect IN TXT "_xmpp-client-xbosh=https://yourdomain:5281/http-bind"
_xmppconnect IN TXT "_xmpp-client-websocket=wss://yourdomain:5281/xmpp-websocket"
```
Set the PTR record of your proxy servers IPs to your domain. This can usually be done from your hosting panels configuration, but may not be available with every hosting provider, where you can then request them to do it via a support ticket.
Consider registering your domain with [DNSWL](https://www.dnswl.org/), [SNDS](https://sendersupport.olc.protection.outlook.com/snds/), [Google Postmaster Tools](https://postmaster.google.com/) and [YahooCFL](https://senders.yahooinc.com/complaint-feedback-loop/) for valuable insights into your delivery.
Consider enabling DNSSEC on your domain, when available by your Domain registrar. Some registrars may charge extra for it. Once enabled, you can also enable DANE, which increases security. Use [TLSA Record Genearator](https://ssl-tools.net/tlsa-generator) to help you create an appropriate DNS record.
Consider adding your domain to [HSTS Preload List](https://hstspreload.org/) which will prevent browsers from even trying to access your domain on the insecure http:// protocol and automatically upgreade to https://
### Final configuration steps
Follow [SnappyMail installation instructions](https://github.com/the-djmaze/snappymail/wiki/Installation-instructions#now-access-the-admin-page) to finish setting it up at yourdomain/mail/snappymail/?admin
Translating:
------------
Translations are managed in [Weblate](https://weblate.danwin1210.de/projects/DanWin/mail-hosting).
If you prefer manually submitting translations, the script `update-translations.sh` can be used to update the language template and translation files from source.
It will generate the file `locale/mail-hosting.pot` which you can then use as basis to create a new language file in `YOUR_LANG_CODE/LC_MESSAGES/mail-hosting.po` and edit it with a translation program, such as [Poedit](https://poedit.net/).
Once you are done, you can open a pull request, or [email me](mailto:daniel@danwin1210.de), to include the translation.
Live demo:
----------
If you want to see the script in action, and/or register for a free anonymous E-Mail address, you can visit my [Tor hidden service](http://danielas3rtn54uwmofdo3x2bsdifr47huasnmbgqzfrec5ubupvtpid.onion/mail/) or [my clearnet proxy](https://danwin1210.de/mail/) if you don't have Tor installed.
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