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/device/netstat_tcp.inc.php

@@ -0,0 +1,31 @@
+<?php
+
+$rrd_filename = rrd_name($device['hostname'], 'netstats-tcp');
+
+$stats = array(
+    'tcpInSegs',
+    'tcpOutSegs',
+    'tcpActiveOpens',
+    'tcpPassiveOpens',
+    'tcpAttemptFails',
+    'tcpEstabResets',
+    'tcpRetransSegs',
+);
+
+$i = 0;
+foreach ($stats as $stat) {
+    $i++;
+    $rrd_list[$i]['filename'] = $rrd_filename;
+    $rrd_list[$i]['descr']    = str_replace('tcp', '', $stat);
+    $rrd_list[$i]['ds']       = $stat;
+    if (strpos($stat, 'Out') !== false || strpos($stat, 'Retrans') !== false || strpos($stat, 'Attempt') !== false) {
+        $rrd_list[$i]['invert'] = true;
+    }
+}
+
+$colours = 'mixed';
+
+$nototal    = 1;
+$simple_rrd = 1;
+
+require 'includes/html/graphs/generic_multi_line.inc.php';