Add HAProxy remote access example (#8026)

* Add HAProxy remote access example

Created an HAProxy remote access proxy documentation and
example configuration.

* ✏️ Tweaks

* ✏️ Typo fix

source/_docs/ecosystem/haproxy.markdown

@@ -0,0 +1,114 @@
+---
+layout: page
+title: "HAProxy"
+description: "Documentation about setting up Home Assistant with HAProxy"
+date: 2018-01-02 11:23:00 -0500
+sidebar: true
+comments: false
+sharing: true
+footer: true
+---
+
+Using HAProxy to proxy for Home Assistant allows you to serve Home Assistant securely over standard ports with HTTP to HTTPS redirection.
+
+### {% linkable_title Install HAProxy on your server %}
+
+This will vary depending on your OS. Check out Google for this.
+
+### {% linkable_title Obtain an SSL certificate %}
+
+There are multiple ways of obtaining an SSL certificate. Let’s Encrypt is one method.
+Use Google for this, but a good example of using Certbot can be found [here](https://www.digitalocean.com/community/tutorials/how-to-secure-haproxy-with-let-s-encrypt-on-ubuntu-12-04).
+
+### {% linkable_title HAPRoxy Configuration %}
+
+The following configuration updates HAProxy defaults for more secure ciphers for SSL and logging and connection
+timeouts.
+
+Items to update for your deployment:
+
+ * `bind`: Update the ports HAProxy listens on for forwarding.
+ * `subdomain.domain.com`: Your domain to use
+ * `ssl crt`: The path to your SSL certificate.
+ * `server hass 127.0.0.1:8123`: The IP and port location of your Home Assistant instance.
+
+```text
+global
+	log /dev/log	local0
+	log /dev/log	local1 notice
+	chroot /var/lib/haproxy
+	stats socket /run/haproxy/admin.sock mode 660 level admin
+	stats timeout 30s
+	user haproxy
+	group haproxy
+	daemon
+
+	# Default SSL material locations
+	ca-base /etc/ssl/certs
+	crt-base /etc/ssl/private
+
+	# Default ciphers to use on SSL-enabled listening sockets.
+	# For more information, see ciphers(1SSL). This list is from:
+	#  https://hynek.me/articles/hardening-your-web-servers-ssl-ciphers/
+	ssl-default-bind-ciphers ECDH+AESGCM:DH+AESGCM:ECDH+AES256:DH+AES256:ECDH+AES128:DH+AES:ECDH+3DES:DH+3DES:RSA+AESGCM:RSA+AES:RSA+3DES:!aNULL:!MD5:!DSS
+	ssl-default-bind-options no-sslv3
+	maxconn 2048
+	tune.ssl.default-dh-param 2048
+
+defaults
+	log	global
+	mode	http
+	option	httplog
+	option	dontlognull
+	timeout connect 5000
+	timeout client  50000
+	timeout server  50000
+	timeout http-request 5s  #protection from Slowloris attacks
+
+frontend www-http
+	bind *:80
+	redirect scheme https
+
+frontend www-https
+	log /dev/log	local0 debug
+	bind *:443 ssl crt /etc/haproxy/certs/MYCERT.pem
+	acl hass-acl hdr(host) -i SUBDOMAIN.DOMAIN.COM
+	use_backend hass-backend if hass-acl
+	
+backend hass-backend
+	server hass <Home Assistant Server IP>:8123
+
+	mode http
+	option forwardfor
+	http-request add-header X-Forwarded-Proto https
+	http-request add-header X-Forwarded-Port 443
+```
+
+### {% linkable_title Forward Ports %}
+
+Forward ports 443 and (optionally) 80 to your server on your router.
+
+Do not forward port 8123, HAProxy takes care of securing the connection with HTTPS on 443.
+If 8123 is forwarded then it will not be secured.
+
+Replace 443 with whatever port you chose to bind to in the config if different.
+
+### {% linkable_title Configure Home Assistant HTTP Component %}
+
+In your `configuration.yaml` file, edit the [http component](https://www.home-assistant.io/components/http/).
+
+```text
+http:
+  # For extra security set this to only accept connection on localhost if HAProxy is on the same machine
+  # server_host: 127.0.0.1
+  # Update this line to be your domain
+  base_url: https://example.com
+  use_x_forwarded_for: true
+  # You must set the trusted proxy IP address so that Home Assistant will properly accept connections
+  # Set this to your HAProxy machine IP, or localhost if hosted on the same machine.
+  trusted_proxies: <HAProxy IP address here, 127.0.0.1 if same machine>
+```
+
+### {% linkable_title Restart or Reload HAProxy %}
+
+Use your OS method of restarting or reloading HAProxy. Use Google for this.

source/_includes/asides/docs_navigation.html

@@ -187,6 +187,7 @@
             <ul>
               <li>{% active_link /docs/ecosystem/apache/ Apache %}</li>
               <li>{% active_link /docs/ecosystem/caddy/ Caddy Server %}</li>
+              <li>{% active_link /docs/ecosystem/haproxy/ HAProxy %}</li>
               <li>{% active_link /docs/ecosystem/nginx/ NGINX %}</li>
               <li>{% active_link /docs/ecosystem/nginx_subdomain/ NGINX with subdomain%}</li>
               <li>{% active_link /docs/ecosystem/tor/ Tor Onion Service %}</li>