Sanitize report name in pdf.php (#10270)

Authentication users could include arbitrary file.

LibreNMS/Util/Clean.php

@@ -0,0 +1,78 @@
+<?php
+/**
+ * Clean.php
+ *
+ * -Description-
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * @package    LibreNMS
+ * @link       http://librenms.org
+ * @copyright  2019 Tony Murray
+ * @author     Tony Murray <murraytony@gmail.com>
+ */
+
+namespace LibreNMS\Util;
+
+use HTMLPurifier;
+use HTMLPurifier_Config;
+use LibreNMS\Config;
+
+class Clean
+{
+    /**
+     * Sanitize file name by removing all invalid characters.
+     * Does not make the string safe for javascript or sql!
+     *
+     * @param string $file
+     * @return string|string[]|null
+     */
+    public static function fileName($file)
+    {
+        return preg_replace('/[^a-zA-Z0-9\-._]/', '', $file);
+    }
+
+    /**
+     * Clean a string for display in an html page.
+     * For use in non-blade pages
+     *
+     * @param $value
+     * @param array $purifier_config (key, value pair)
+     * @return string
+     */
+    public static function html($value, $purifier_config = [])
+    {
+        /** @var HTMLPurifier $purifier */
+        static $purifier;
+
+        // If $purifier_config is non-empty then we don't want
+        // to convert html tags and allow these to be controlled
+        // by purifier instead.
+        if (empty($purifier_config)) {
+            $value = htmlentities($value);
+        }
+
+        if (!isset($purifier)) {
+            // initialize HTML Purifier here since this is the only user
+            $p_config = HTMLPurifier_Config::createDefault();
+            $p_config->set('Cache.SerializerPath', Config::get('temp_dir', '/tmp'));
+            foreach ($purifier_config as $k => $v) {
+                $p_config->set($k, $v);
+            }
+            $purifier = new HTMLPurifier($p_config);
+        }
+
+        return $purifier->purify(stripslashes($value));
+    }
+}

LibreNMS/Util/Html.php

@@ -119,36 +119,4 @@ class Html
 
         return $output;
     }
-
-    /**
-     * Clean a string for display in an html page.
-     *
-     * @param $value
-     * @param array $purifier_config (key, value pair)
-     * @return string
-     */
-    public static function display($value, $purifier_config = [])
-    {
-        /** @var HTMLPurifier $purifier */
-        static $purifier;
-
-        // If $purifier_config is non-empty then we don't want
-        // to convert html tags and allow these to be controlled
-        // by purifier instead.
-        if (empty($purifier_config)) {
-            $value = htmlentities($value);
-        }
-
-        if (!isset($purifier)) {
-            // initialize HTML Purifier here since this is the only user
-            $p_config = HTMLPurifier_Config::createDefault();
-            $p_config->set('Cache.SerializerPath', Config::get('temp_dir', '/tmp'));
-            foreach ($purifier_config as $k => $v) {
-                $p_config->set($k, $v);
-            }
-            $purifier = new HTMLPurifier($p_config);
-        }
-
-        return $purifier->purify(stripslashes($value));
-    }
 }

app/Http/Controllers/Widgets/NotesController.php

@@ -51,7 +51,7 @@ class NotesController extends WidgetController
             'HTML.SafeIframe' => true,
             'URI.SafeIframeRegexp' => '%^(https?:)?//%',
         ];
-        $output = Html::display(nl2br($settings['notes']), $purifier_config);
+        $output = \LibreNMS\Util\Clean::html(nl2br($settings['notes']), $purifier_config);
 
         return $output;
     }

html/pdf.php

@@ -12,12 +12,12 @@
  * the source code distribution for details.
  */
 
-use LibreNMS\Authentication\LegacyAuth;
+use LibreNMS\Config;
 
-$init_modules = array('web', 'auth');
+$init_modules = ['web', 'auth'];
 require realpath(__DIR__ . '/..') . '/includes/init.php';
 
-if (!LegacyAuth::check()) {
+if (!Auth::check()) {
     die('Unauthorized');
 }
 
@@ -25,11 +25,13 @@ set_debug(strpos($_SERVER['PATH_INFO'], 'debug'));
 
 $pdf = new TCPDF(PDF_PAGE_ORIENTATION, PDF_UNIT, PDF_PAGE_FORMAT, true, 'UTF-8', false);
 
-$pdf->SetCreator($config['project_name']);
-$pdf->SetAuthor($config['project_name']);
-$pdf->setFooterData(array(0, 64, 0), array(0, 64, 128));
-$pdf->setHeaderFont(array(PDF_FONT_NAME_MAIN, '', PDF_FONT_SIZE_MAIN));
-$pdf->setFooterFont(array(PDF_FONT_NAME_DATA, '', PDF_FONT_SIZE_DATA));
+$project_name = Config::get('project_name');
+
+$pdf->SetCreator($project_name);
+$pdf->SetAuthor($project_name);
+$pdf->setFooterData([0, 64, 0], [0, 64, 128]);
+$pdf->setHeaderFont([PDF_FONT_NAME_MAIN, '', PDF_FONT_SIZE_MAIN]);
+$pdf->setFooterFont([PDF_FONT_NAME_DATA, '', PDF_FONT_SIZE_DATA]);
 $pdf->SetDefaultMonospacedFont(PDF_FONT_MONOSPACED);
 $pdf->SetMargins(PDF_MARGIN_LEFT, PDF_MARGIN_TOP, PDF_MARGIN_RIGHT);
 $pdf->SetHeaderMargin(PDF_MARGIN_HEADER);
@@ -38,11 +40,12 @@ $pdf->SetAutoPageBreak(true, PDF_MARGIN_BOTTOM);
 $pdf->setImageScale(PDF_IMAGE_SCALE_RATIO);
 $pdf->setFontSubsetting(true);
 $pdf->SetFont('helvetica', '', 14, '', true);
-$pdf->setTextShadow(array('enabled' => false, 'depth_w' => 0.2, 'depth_h' => 0.2, 'color' => array(196, 196, 196), 'opacity' => 1, 'blend_mode' => 'Normal'));
+$pdf->setTextShadow(['enabled' => false, 'depth_w' => 0.2, 'depth_h' => 0.2, 'color' => [196, 196, 196], 'opacity' => 1, 'blend_mode' => 'Normal']);
 
-if (isset($_GET['report']) && !empty($_GET['report'])) {
-    $report = mres($_GET['report']);
-    $pdf->SetHeaderData('../../../../../html/'.$config['title_image'], 40, ucfirst($report), $config['project_name'], array(0, 0, 0), array(0, 64, 128));
+if (!empty($_GET['report'])) {
+    $report = \LibreNMS\Util\Clean::fileName($_GET['report']);
+    $image = base_path('html/' . Config::get('title_image'));
+    $pdf->SetHeaderData($image, 40, ucfirst($report), $project_name, [0, 0, 0], [0, 64, 128]);
     include_once "includes/html/reports/$report.pdf.inc.php";
 } else {
     $report = 'report';

includes/common.php

@@ -1523,7 +1523,7 @@ function clean($value, $strip_tags = true)
  */
 function display($value, $purifier_config = [])
 {
-    return Html::display($value, $purifier_config);
+    return \LibreNMS\Util\Clean::html($value, $purifier_config);
 }
 
 /**