Do not expose the Web admin interface by default, fixes #40

nginx/nginx.conf

@@ -10,6 +10,7 @@ events {
 
 # Environment variables used in the configuration
 env WEBMAIL;
+env EXPOSE_ADMIN;
 
 http {
     # Standard HTTP configuration with slight hardening
@@ -42,6 +43,7 @@ http {
 
       # Load Lua variables
       set_by_lua $webmail 'return os.getenv("WEBMAIL")';
+      set_by_lua $expose_admin 'return os.getenv("EXPOSE_ADMIN")';
 
       # Actual logic
 
@@ -50,11 +52,19 @@ http {
           proxy_pass http://webmail;
         }
 
-        return 403;
+        if ($webmail = none) {
+          return 403;
+        }
       }
 
       location /admin {
-        proxy_pass http://admin;
+        if ($expose_admin = yes) {
+          proxy_pass http://admin;
+        }
+
+        if ($expose_admin != yes) {
+          return 403;
+        }
       }
     }
 }