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<title>[10177] sites/trunk/wordpress.org/public_html/wp-content/plugins/theme-directory: Theme Directory: API: Be far more strict and defensive with inputs.</title>
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<dt style="float: left; width: 6em; font-weight: bold">Revision</dt> <dd><a style="font-weight: bold" href="http://meta.trac.wordpress.org/changeset/10177">10177</a><script type="application/ld+json">{"@context":"http://schema.org","@type":"EmailMessage","description":"Review this Commit","action":{"@type":"ViewAction","url":"http://meta.trac.wordpress.org/changeset/10177","name":"Review Commit"}}</script></dd>
<dt style="float: left; width: 6em; font-weight: bold">Author</dt> <dd>dd32</dd>
<dt style="float: left; width: 6em; font-weight: bold">Date</dt> <dd>2020-08-19 00:17:39 +0000 (Wed, 19 Aug 2020)</dd>
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<pre style='padding-left: 1em; margin: 2em 0; border-left: 2px solid #ccc; line-height: 1.25; font-size: 105%; font-family: sans-serif'>Theme Directory: API: Be far more strict and defensive with inputs.

Someone out there is sending a lot of requests to the API with junk data causing PHP warnings.

This validates input and rejects the junk.</pre>

<h3>Modified Paths</h3>
<ul>
<li><a href="#sitestrunkwordpressorgpublic_htmlwpcontentpluginsthemedirectoryclassthemesapiphp">sites/trunk/wordpress.org/public_html/wp-content/plugins/theme-directory/class-themes-api.php</a></li>
<li><a href="#sitestrunkwordpressorgpublic_htmlwpcontentpluginsthemedirectorythemedirectoryphp">sites/trunk/wordpress.org/public_html/wp-content/plugins/theme-directory/theme-directory.php</a></li>
</ul>

</div>
<div id="patch">
<h3>Diff</h3>
<a id="sitestrunkwordpressorgpublic_htmlwpcontentpluginsthemedirectoryclassthemesapiphp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: sites/trunk/wordpress.org/public_html/wp-content/plugins/theme-directory/class-themes-api.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- sites/trunk/wordpress.org/public_html/wp-content/plugins/theme-directory/class-themes-api.php     2020-08-18 05:55:10 UTC (rev 10176)
+++ sites/trunk/wordpress.org/public_html/wp-content/plugins/theme-directory/class-themes-api.php       2020-08-19 00:17:39 UTC (rev 10177)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -78,6 +78,12 @@
</span><span class="cx" style="display: block; padding: 0 10px">         */
</span><span class="cx" style="display: block; padding: 0 10px">        private $cache_life = 600; // 10 minutes.
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+        /**
+        * Flag the input as having been malformed.
+        * 
+        * @var bool
+        */
+       public $bad_input = false;
</ins><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">        /**
</span><span class="cx" style="display: block; padding: 0 10px">         * Constructor.
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -88,6 +94,41 @@
</span><span class="cx" style="display: block; padding: 0 10px">        public function __construct( $action = '', $request = array() ) {
</span><span class="cx" style="display: block; padding: 0 10px">                $this->request = (object) $request;
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                // Filter out bad inputs.
+               $scalar_only_fields = [
+                       'author',
+                       'browse',
+                       'locale',
+                       'per_page',
+                       'slug',
+                       'search',
+                       'theme',
+                       'wp_version',
+               ];
+               foreach ( $scalar_only_fields as $field ) {
+                       if ( isset( $this->request->$field ) && ! is_scalar( $this->request->$field ) ) {
+                               unset( $this->request->$field );
+                               $this->bad_input = true;
+                       }
+               }
+
+               $array_of_string_fields = [
+                       'fields',
+                       'slugs',
+                       'tag',
+               ];
+               foreach ( $array_of_string_fields as $field ) {
+                       if ( isset( $this->request->$field ) ) {
+                               $this->request->$field = $this->array_of_strings( $this->request->$field );
+
+                               // If the resulting field is invalid, ignore it entirely.
+                               if ( ! $this->request->$field ) {
+                                       unset( $this->request->$field );
+                                       $this->bad_input = true;
+                               }
+                       }
+               }
+
</ins><span class="cx" style="display: block; padding: 0 10px">                 // The locale we should use is specified by the request
</span><span class="cx" style="display: block; padding: 0 10px">                add_filter( 'locale', array( $this, 'filter_locale' ) );
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -112,7 +153,11 @@
</span><span class="cx" style="display: block; padding: 0 10px">         * Filter get_locale() to use the locale which is specified in the request.
</span><span class="cx" style="display: block; padding: 0 10px">         */
</span><span class="cx" style="display: block; padding: 0 10px">        function filter_locale( $locale ) {
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                return isset( $this->request->locale ) ? $this->request->locale : $locale;
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+         if ( ! empty( $this->request->locale ) ) {
+                       $locale = (string) $this->request->locale;
+               }
+
+               return $locale;
</ins><span class="cx" style="display: block; padding: 0 10px">         }
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">        /**
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -134,6 +179,8 @@
</span><span class="cx" style="display: block; padding: 0 10px">                        return wp_json_encode( $response );
</span><span class="cx" style="display: block; padding: 0 10px">                } elseif ( 'php' === $format ) {
</span><span class="cx" style="display: block; padding: 0 10px">                        return serialize( $response );
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                } elseif ( 'api_object' === $format ) {
+                       return $this;
</ins><span class="cx" style="display: block; padding: 0 10px">                 } else { // 'raw' === $format, or anything else.
</span><span class="cx" style="display: block; padding: 0 10px">                        return $response;
</span><span class="cx" style="display: block; padding: 0 10px">                }
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -166,7 +213,7 @@
</span><span class="cx" style="display: block; padding: 0 10px">                }
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">                if ( ! empty( $this->request->number ) ) {
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                        $this->response = array_slice( $this->response, 0, $this->request->number );
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                 $this->response = array_slice( $this->response, 0, (int) $this->request->number );
</ins><span class="cx" style="display: block; padding: 0 10px">                 }
</span><span class="cx" style="display: block; padding: 0 10px">        }
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -236,8 +283,8 @@
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">                // The 1.2+ api expects a `wp_version` field to be sent and does not use the UA.
</span><span class="cx" style="display: block; padding: 0 10px">                if ( defined( 'THEMES_API_VERSION' ) && THEMES_API_VERSION >= 1.2 ) {
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                        if ( isset( $this->request->wp_version ) ) {
-                               $wp_version = $this->request->wp_version;
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                 if ( ! empty( $this->request->wp_version ) ) {
+                               $wp_version = (string) $this->request->wp_version;
</ins><span class="cx" style="display: block; padding: 0 10px">                         }
</span><span class="cx" style="display: block; padding: 0 10px">                } elseif ( preg_match( '|WordPress/([^;]+)|', $_SERVER['HTTP_USER_AGENT'], $matches ) ) {
</span><span class="cx" style="display: block; padding: 0 10px">                        // Get version from user agent since it's not explicitly sent to feature_list requests in older API branches.
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -324,8 +371,7 @@
</span><span class="cx" style="display: block; padding: 0 10px">                        return;
</span><span class="cx" style="display: block; padding: 0 10px">                }
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                $slugs = is_array( $this->request->slugs ) ? $this->request->slugs : explode( ',', $this->request->slugs );
-               $slugs = array_unique( array_map( 'trim', $slugs ) );
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+         $slugs = (array) $this->request->slugs;
</ins><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">                if ( count( $slugs ) > 100 ) {
</span><span class="cx" style="display: block; padding: 0 10px">                        $this->response = (object) array( 'error' => 'A maximum of 100 themes can be queried at once.' );
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -356,11 +402,13 @@
</span><span class="cx" style="display: block; padding: 0 10px">                }
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">                // Theme slug to identify theme.
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                if ( empty( $this->request->slug ) ) {
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+         if ( empty( $this->request->slug ) || ! trim( $this->request->slug ) ) {
</ins><span class="cx" style="display: block; padding: 0 10px">                         $this->response = (object) array( 'error' => 'Slug not provided' );
</span><span class="cx" style="display: block; padding: 0 10px">                        return;
</span><span class="cx" style="display: block; padding: 0 10px">                }
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                $this->request->slug = trim( $this->request->slug );
+
</ins><span class="cx" style="display: block; padding: 0 10px">                 // Set which fields wanted by default:
</span><span class="cx" style="display: block; padding: 0 10px">                $defaults = array(
</span><span class="cx" style="display: block; padding: 0 10px">                        'sections'     => true,
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -381,9 +429,8 @@
</span><span class="cx" style="display: block; padding: 0 10px">                        $defaults['requires_php'] = true;
</span><span class="cx" style="display: block; padding: 0 10px">                }
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                if ( empty( $this->request->fields ) ) {
-                       $this->request->fields = array();
-               }
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+         $this->request->fields = (array) $this->request->fields ?? [];
+
</ins><span class="cx" style="display: block; padding: 0 10px">                 $this->fields = array_merge( $this->fields, $defaults, (array) $this->request->fields );
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">                // If there is a cached result, return that.
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -447,12 +494,10 @@
</span><span class="cx" style="display: block; padding: 0 10px">                        $defaults['requires_php'] = true;
</span><span class="cx" style="display: block; padding: 0 10px">                }
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                if ( isset( $this->request->fields ) ) {
-                       $this->fields = array_merge( $this->fields, $defaults, (array) $this->request->fields );
-               } else {
-                       $this->fields = array_merge( $this->fields, $defaults );
-               }
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+         $this->request->fields = (array) $this->request->fields ?? [];
</ins><span class="cx" style="display: block; padding: 0 10px"> 
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                $this->fields = array_merge( $this->fields, $defaults, $this->request->fields );
+
</ins><span class="cx" style="display: block; padding: 0 10px">                 // If there is a cached result, return that.
</span><span class="cx" style="display: block; padding: 0 10px">                $cache_key = sanitize_key( __METHOD__ . ':' . get_locale() . ':' . md5( serialize( $this->request ) . serialize( $this->fields ) ) );
</span><span class="cx" style="display: block; padding: 0 10px">                if ( false !== ( $this->response = wp_cache_get( $cache_key, $this->cache_group ) ) && empty( $this->request->cache_buster ) ) {
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -461,10 +506,6 @@
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">                $this->result = $this->perform_wp_query();
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                if ( empty( $this->request->fields ) ) {
-                       $this->request->fields = array();
-               }
-
</del><span class="cx" style="display: block; padding: 0 10px">                 // Basic information about the request.
</span><span class="cx" style="display: block; padding: 0 10px">                $this->response = (object) array(
</span><span class="cx" style="display: block; padding: 0 10px">                        'info'   => array(),
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -495,17 +536,17 @@
</span><span class="cx" style="display: block; padding: 0 10px">                        $this->query['paged'] = (int) $this->request->page;
</span><span class="cx" style="display: block; padding: 0 10px">                }
</span><span class="cx" style="display: block; padding: 0 10px">                if ( isset( $this->request->per_page ) ) {
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                        $this->query['posts_per_page'] = min( $this->request->per_page, 999 );
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                 $this->query['posts_per_page'] = min( (int) $this->request->per_page, 999 );
</ins><span class="cx" style="display: block; padding: 0 10px">                 }
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">                // Views
</span><span class="cx" style="display: block; padding: 0 10px">                if ( ! empty( $this->request->browse ) ) {
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                        $this->query['browse'] = $this->request->browse;
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                 $this->query['browse'] = (string) $this->request->browse;
</ins><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">                        if ( 'featured' == $this->request->browse ) {
</span><span class="cx" style="display: block; padding: 0 10px">                                $this->cache_life = HOUR_IN_SECONDS;
</span><span class="cx" style="display: block; padding: 0 10px">                        } elseif ( 'favorites' == $this->request->browse ) {
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                                $this->query['favorites_user'] = $this->request->user;
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                         $this->query['favorites_user'] = (string) $this->request->user;
</ins><span class="cx" style="display: block; padding: 0 10px">                         }
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">                }
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -512,10 +553,7 @@
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">                // Tags
</span><span class="cx" style="display: block; padding: 0 10px">                if ( ! empty( $this->request->tag ) ) {
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                        if ( ! is_array( $this->request->tag ) ) {
-                               $this->request->tag = explode( ',', $this->request->tag );
-                       }
-                       $this->request->tag = array_unique( $this->request->tag );
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                 $this->request->tag = (array) $this->request->tag;
</ins><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">                        // Replace updated tags.
</span><span class="cx" style="display: block; padding: 0 10px">                        $updated_tags = array(
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -540,12 +578,12 @@
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">                // Search
</span><span class="cx" style="display: block; padding: 0 10px">                if ( ! empty( $this->request->search ) ) {
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                        $this->query['s'] = $this->request->search;
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                 $this->query['s'] = (string) $this->request->search;
</ins><span class="cx" style="display: block; padding: 0 10px">                 }
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">                // Direct theme
</span><span class="cx" style="display: block; padding: 0 10px">                if ( ! empty( $this->request->theme ) ) {
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                        $this->query['name'] = $this->request->theme;
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                 $this->query['name'] = (string) $this->request->theme;
</ins><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">                        add_filter( 'parse_query', array( $this, 'direct_theme_query' ) );
</span><span class="cx" style="display: block; padding: 0 10px">                }
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -552,7 +590,7 @@
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">                // Author
</span><span class="cx" style="display: block; padding: 0 10px">                if ( ! empty( $this->request->author ) ) {
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                        $this->query['author_name'] = $this->request->author;
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                 $this->query['author_name'] = (string) $this->request->author;
</ins><span class="cx" style="display: block; padding: 0 10px">                 }
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">                // Query
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -867,4 +905,28 @@
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">                return $description;
</span><span class="cx" style="display: block; padding: 0 10px">        }
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+
+       /**
+        * Helper method to return an array of trimmed strings.
+        */
+       protected function array_of_strings( $input ) {
+               if ( is_string( $input ) ) {
+                       $input = explode( ',', $input );
+               }
+
+               if ( ! $input || ! is_array( $input ) ) {
+                       return [];
+               }
+
+               foreach ( $input as $k => $v ) {
+                       if ( ! is_scalar( $v ) ) {
+                               unset( $input[ $k ] );
+                       } elseif ( is_string( $v ) ) {
+                               // Don't affect non-strings such as int's and bools.
+                               $input[ $k ] = trim( $v );
+                       }
+               }
+
+               return array_unique( $input );
+       }
</ins><span class="cx" style="display: block; padding: 0 10px"> }
</span></span></pre></div>
<a id="sitestrunkwordpressorgpublic_htmlwpcontentpluginsthemedirectorythemedirectoryphp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: sites/trunk/wordpress.org/public_html/wp-content/plugins/theme-directory/theme-directory.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- sites/trunk/wordpress.org/public_html/wp-content/plugins/theme-directory/theme-directory.php      2020-08-18 05:55:10 UTC (rev 10176)
+++ sites/trunk/wordpress.org/public_html/wp-content/plugins/theme-directory/theme-directory.php        2020-08-19 00:17:39 UTC (rev 10177)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -856,7 +856,7 @@
</span><span class="cx" style="display: block; padding: 0 10px">  *
</span><span class="cx" style="display: block; padding: 0 10px">  * @param $method string The Method being called. Valid values: 'query_themes', 'theme_information', 'hot_tags', 'feature_list', and 'get_commercial_shops'
</span><span class="cx" style="display: block; padding: 0 10px">  * @param $args   array  The arguements for the call.
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">- * @param $format string The format to return the data in. Valid values: 'json', 'php', 'raw' (default)
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ * @param $format string The format to return the data in. Valid values: 'json', 'php', 'api_object', 'raw' (default)
</ins><span class="cx" style="display: block; padding: 0 10px">  */
</span><span class="cx" style="display: block; padding: 0 10px"> function wporg_themes_query_api( $method, $args = array(), $format = 'raw' ) {
</span><span class="cx" style="display: block; padding: 0 10px">        if ( ! class_exists( 'Themes_API' ) ) {
</span></span></pre>
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