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/application/squid_cputime.inc.php

@@ -0,0 +1,30 @@
+<?php
+
+$name = 'squid';
+$app_id = $app['app_id'];
+$colours       = 'mixed';
+$unit_text     = 'seconds';
+$unitlen       = 10;
+$bigdescrlen   = 10;
+$smalldescrlen = 10;
+$dostack       = 0;
+$printtotal    = 0;
+$addarea       = 1;
+$transparency  = 15;
+
+$rrd_filename = rrd_name($device['hostname'], array('app', $name, $app_id));
+
+if (rrdtool_check_rrd_exists($rrd_filename)) {
+    $rrd_list = array(
+        array(
+            'filename' => $rrd_filename,
+            'descr'    => 'cpu time',
+            'ds'       => 'cputime',
+            'colour'   => '582a72'
+        )
+    );
+} else {
+    echo "file missing: $rrd_filename";
+}
+
+require 'includes/html/graphs/generic_v3_multiline.inc.php';