Configuring SSL Reverse Proxy

Rocket.Chat is a middle tier application server, by itself it does not handle SSL. However, Rocket.Chat works well with several industrial grade, battle-tested reverse proxy servers (see nginx below, for example) that you can configure to handle SSL.
Note: You must use the outside https address for the value at ROOT_URL in [[Section 3|Deploy-Rocket.Chat-without-docker#3-download-rocketchat]] above. This includes the https:// and leave off the port number. So instead of ROOT_URL=http://localhost:3000 use something like https://your_hostname.com
Note: When setting up a reverse proxy in front of your Rocket.Chat server you need to configure Rocket.Chat to use the correct clientAddress. The rate limiter (and maybe other features) will not work properly if this is not done. Set HTTP_FORWARDED_COUNT Environment variable to the correct number of proxies in front of Rocket.Chat. If you are using snap there's a documentation how to do it here​
Running behind a nginx SSL Reverse Proxy
Note: These instructions were written for Ubuntu. For Amazon Linux, the conf file for the proxy goes in /etc/nginx/conf.d/ and needs to have a discrete name ending in .conf and nginx is installed using yum -y install nginx.
Run this as root:
apt-get install nginx
Add your private key to /etc/nginx/certificate.key
Lock down permissions: chmod 400 /etc/nginx/certificate.key
Add your certificate to /etc/nginx/certificate.crt
Edit /etc/nginx/sites-enabled/default or if you use nginx from docker /etc/nginx/conf.d/default.conf and be sure to use your actual hostname in lieu of the sample hostname "your_hostname.com" below.
# Upstreams
upstream backend {
    server 127.0.0.1:3000;
}
​
# HTTPS Server
server {
    listen 443;
    server_name your_hostname.com;
​
    # You can increase the limit if your need to.
    client_max_body_size 200M;
​
    error_log /var/log/nginx/rocketchat.access.log;
​
    ssl on;
    ssl_certificate /etc/nginx/certificate.crt;
    ssl_certificate_key /etc/nginx/certificate.key;
    ssl_protocols TLSv1 TLSv1.1 TLSv1.2; # don’t use SSLv3 ref: POODLE
​
    location / {
        proxy_pass http://backend;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";
        proxy_set_header Host $http_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 https;
        proxy_set_header X-Nginx-Proxy true;
​
        proxy_redirect off;
    }
}
Restart Nginx: service nginx restart
Running under Plesk Onyx behind Nginx
Plesk Onyx has now a docker installation and Nginx proxy docker rule generator built in, that doesn't support adding custom directives. Disable it and add the rules manually in the additional Nginx directives space. A scheme follows (replace 30000 with your external docker mapped port).
#manual extension docker with socket upgrade begin
location ~ ^/.* {
    proxy_pass http://0.0.0.0:3000;
    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 Upgrade $http_upgrade;
    proxy_set_header Connection "upgrade";
    proxy_set_header X-Forwarded-Proto http;
    proxy_set_header X-Nginx-Proxy true;
    proxy_http_version 1.1;
​
    proxy_redirect off;
}
​
#extension docker end
Running behind an Apache SSL Reverse Proxy
Note: You must use the outside https address for the value at ROOT_URL in [[Section 3|Deploy-Rocket.Chat-without-docker#3-download-rocketchat]] above. This includes the https:// and leave off the port number. So instead of ROOT_URL=http://localhost:3000 use something like https://your_hostname.com
Run this as root:
apt-get update
apt-get install apache2
a2enmod proxy_http
a2enmod proxy
a2enmod ssl
a2enmod proxy_wstunnel
a2enmod rewrite
Add your private key to /etc/ssl/private/chat.domain.com.key
Lock down permissions: chmod 400 /etc/ssl/private/chat.domain.com.key
Add your certificate to /etc/ssl/certs/chat.domain.com.crt
Add your intermediate to /etc/ssl/certs/intermediate.ca.pem
Edit /etc/apache2/sites-enabled/rocketchat.conf and be sure to use your actual hostname in lieu of the sample hostname "your_hostname.com" below.
<VirtualHost *:443>
    ServerAdmin [email protected]
    ServerName chat.domain.com
​
    LogLevel info
    ErrorLog /var/log/chat.domain.com_error.log
    TransferLog /var/log/chat.domain.com_access.log
​
    SSLEngine On
    SSLCertificateFile /etc/ssl/certs/chat.domain.com.crt
    SSLCertificateKeyFile /etc/ssl/private/chat.domain.com.key
    SSLCertificateChainFile /etc/ssl/certs/intermediate.ca.pem
​
    <Location />
        Require all granted
    </Location>
​
    RewriteEngine On
    RewriteCond %{HTTP:CONNECTION} Upgrade [NC]
    RewriteCond %{HTTP:Upgrade} =websocket [NC]
    RewriteRule /(.*)           ws://localhost:3000/$1 [P,L]
    RewriteCond %{HTTP:Upgrade} !=websocket [NC]
    RewriteRule /(.*)           http://localhost:3000/$1 [P,L]
​
    ProxyPassReverse /          http://localhost:3000/
</VirtualHost>
Restart Apache: service apache2 restart
Running behind a Caddy Reverse Proxy with Free SSL
First, download Caddy​
curl https://getcaddy.com | bash
Now Caddy is installed, but you still need a service to run Caddy http server on the background.
You can find services backed by the community here​
You must have at least the port 443 opened so the Caddy server will request an SSL certificate from Let's Encrypt
You can also open the port 80 to redirect http requests to https.
Open /etc/caddy/Caddyfile
Insert
yourdomain.com {
        reverse_proxy localhost:3000
        header Access-Control-Allow-Methods "POST, GET, OPTIONS"
        header Access-Control-Allow-Headers "*"
        import cors https://sub.domain.livechat
}
Multi Instance Nginx reverse proxy
Here is a link to a Nginx multi instance reverse proxy example​

Setting up Process Managers and Init Systems

Environment Variables

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Outline

Running behind a nginx SSL Reverse Proxy

Running under Plesk Onyx behind Nginx

Running behind an Apache SSL Reverse Proxy

Running behind a Caddy Reverse Proxy with Free SSL

Multi Instance Nginx reverse proxy