merge #755 - Prevent click jacking of the management interface

conf/nginx-primaryonly.conf

@@ -6,6 +6,9 @@
 	location /admin/ {
 		proxy_pass http://127.0.0.1:10222/;
 		proxy_set_header X-Forwarded-For $remote_addr;
+		add_header X-Frame-Options "DENY";
+		add_header X-Content-Type-Options nosniff;
+		add_header Content-Security-Policy "frame-ancestors 'none';";
 	}
 
 	# ownCloud configuration.