stricter sanitization & markdown rules

js/privatebin.js

@@ -56,7 +56,7 @@ window.PrivateBin = (function () {
      */
     const purifyHtmlConfig = {
         ALLOWED_URI_REGEXP: /^(?:(?:(?:f|ht)tps?|mailto|magnet):)/i,
-        ALLOWED_ATTR: ['href'],
+        FORBID_ATTR: ['id', 'class', 'style'],
         USE_PROFILES: {
             html: true
         }
@@ -2593,11 +2593,13 @@ window.PrivateBin = (function () {
 
             if (format === 'markdown') {
                 const converter = new showdown.Converter({
+                    disallowRawHTML: true,
+                    excludeTrailingPunctuationFromURLs: true,
+                    safeMode: true,
+                    simplifiedAutoLink: true,
                     strikethrough: true,
                     tables: true,
                     tablesHeaderId: true,
-                    simplifiedAutoLink: true,
-                    excludeTrailingPunctuationFromURLs: true
                 });
                 // let showdown convert the HTML and sanitize HTML *afterwards*!
                 if (plainText) {

lib/Configuration.php

@@ -124,7 +124,7 @@ class Configuration
             'js/kjua-0.10.0.js'      => 'sha512-BYj4xggowR7QD150VLSTRlzH62YPfhpIM+b/1EUEr7RQpdWAGKulxWnOvjFx1FUlba4m6ihpNYuQab51H6XlYg==',
             'js/legacy.js'           => 'sha512-pRofxsrf5UItjiP22Dcjh3FAcBjF/n7h8U9/W5xqJk17U0N2U1oajhXypq/omo9jhwS1iVGOhWrRepoPeFns+w==',
             'js/prettify.js'         => 'sha512-puO0Ogy++IoA2Pb9IjSxV1n4+kQkKXYAEUtVzfZpQepyDPyXk8hokiYDS7ybMogYlyyEIwMLpZqVhCkARQWLMg==',
-            'js/privatebin.js'       => 'sha512-Rsz83AgXfc00RxHiCM4bqkAGfps0hQPVYX0P3A66iqUOBaeLgPgq0NeebFDdvUqV+nLYCIMZPZQARfGjjk5YRA==',
+            'js/privatebin.js'       => 'sha512-n/ZCu2upFO6vmNbHmmfsuUNw9ZnLzv/j9SqkvUyV+oBgjFhahoIqWG5dVwr0r+F8ssRm/NEuVakc24rIxiCd2w==',
             'js/purify-3.4.17.js'    => 'sha512-udF2zPdEyVCAxIGeBbeSGFK1Fj5c4eHGi6NqOSsr8M75lGs39POzgUNxO3SFxOg4cHfAoZJgR2EaXdmDi6v6AQ==',
             'js/showdown-2.1.0.js'   => 'sha512-WYXZgkTR0u/Y9SVIA4nTTOih0kXMEd8RRV6MLFdL6YU8ymhR528NLlYQt1nlJQbYz4EW+ZsS0fx1awhiQJme1Q==',
             'js/zlib-1.3.2.js'       => 'sha512-RAhJgxg9siMIA8ky4c10Rc2zUgnK80olHB8Tt1IOYWY4Eh1WmrviQkDn+sgBlb38ZHq3tzufGC41kP360gmosQ==',