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/nfs-server_io.inc.php

@@ -0,0 +1,64 @@
+<?php
+/*
+ * This program is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation, either version 3 of the License, or (at your
+ * option) any later version.  Please see LICENSE.txt at the top level of
+ * the source code distribution for details.
+ *
+ * @package    LibreNMS
+ * @subpackage nfs-server
+ * @link       http://librenms.org
+ * @copyright  2017 LibreNMS
+ * @author     SvennD <svennd@svennd.be>
+*/
+
+require 'includes/html/graphs/common.inc.php';
+$scale_min     = 0;
+$colours       = 'mixed';
+$unit_text     = 'Operations';
+$unitlen       = 10;
+$bigdescrlen   = 15;
+$smalldescrlen = 15;
+$dostack       = 0;
+$printtotal    = 0;
+$addarea       = 1;
+$transparency  = 33;
+
+$rrd_filename  = rrd_name($device['hostname'], array('app', 'nfs-server-default', $app['app_id']));
+
+$array = array(
+    'io_read' => array('descr' => 'read','colour' => '2B9220',),
+    'io_write' => array('descr' => 'write','colour' => 'B0262D',),
+);
+
+$i = 0;
+
+if (rrdtool_check_rrd_exists($rrd_filename)) {
+    foreach ($array as $ds => $var) {
+        $rrd_list[$i]['filename'] = $rrd_filename;
+        $rrd_list[$i]['descr']    = $var['descr'];
+        $rrd_list[$i]['ds']       = $ds;
+        $rrd_list[$i]['colour']   = $var['colour'];
+        $i++;
+    }
+} else {
+    echo "file missing: $rrd_filename";
+}
+
+require 'includes/html/graphs/generic_v3_multiline.inc.php';
+
+
+/*
+This would create a graph with reads above and write belows;
+I can't find out how to adapt the legend. If you wish to swap graphs, 
+uncomment all the above untill <?php and uncomment below this note
+
+$rrd_filename  = rrd_name($device['hostname'], array('app', 'nfs-server-default', $app['app_id']));
+
+$ds_in  = 'io_read';
+$ds_out = 'io_write';
+
+require 'includes/html/graphs/generic_data.inc.php';
+
+*/