[add] added 403 catchall for invalid domains

proxy/files/entrypoint.sh

@@ -199,6 +199,11 @@ function cert_exists()
     [ -f "$cert_path/fullchain.pem" ]
 }
 
+function dummy_cert_exists()
+{
+    cert_exists 0 nixdomain
+}
+
 function certs_daemon()
 {
     (
@@ -242,7 +247,7 @@ function nginx_handler()
 
     # wait for certs to exist before starting nginx
     # just have nginx crash after n retries (default 10)
-    while ! read_file cert_exists "$domain_file" && [ "$retries" -lt "$server_retries" ]; do
+    while ! read_file cert_exists "$domain_file" && ! dummy_cert_exists && [ "$retries" -lt "$server_retries" ]; do
         log nginx_handler "Waiting for certs to be created"
         retries=$(( retries+1 ))
         sleep_wait 1

proxy/files/nginx.conf

@@ -40,6 +40,26 @@ http {
         }
     }
 
+    # catch all non domains
+    server {
+        listen 8443 ssl;
+
+        # prevent redirecting to 8080 port
+        # (e.g. when trailing slash is missed)
+        port_in_redirect off;
+
+        server_name "";
+        
+        ssl_certificate        /service/ssl/nixdomain/fullchain.pem;
+        ssl_certificate_key    /service/ssl/nixdomain/privkey.pem;
+        
+        location / {
+            deny all;
+            return 403;
+        }
+
+    }
+    
     # the following variable is automatically populated via entrypoint.sh 
     #<SERVER>