Security fix: unauthorized access (#10091)

* Security fix: unauthorized access
Affects nginx users:
Moved php files outside of public html directory (Apache was protected by .htaccess)

Affects all users:
Some files did not check for authentication and could disclose some info.
Better checks before including files from user input

* git mv html/includes/ includes/html
git mv html/pages/ includes/html/

includes/html/graphs/sensor/auth.inc.php

@@ -0,0 +1,15 @@
+<?php
+
+if (is_numeric($vars['id'])) {
+    $sensor = dbFetchRow('SELECT * FROM sensors WHERE sensor_id = ?', array($vars['id']));
+
+    if (is_numeric($sensor['device_id']) && ($auth || device_permitted($sensor['device_id']))) {
+        $device = device_by_id_cache($sensor['device_id']);
+
+        $rrd_filename = get_sensor_rrd($device, $sensor);
+
+        $title  = generate_device_link($device);
+        $title .= ' :: Sensor :: '.htmlentities($sensor['sensor_descr']);
+        $auth   = true;
+    }
+}