Changeset 56837

Timestamp:

10/12/2023 12:39:18 PM (3 years ago)

Author:

jorbin

Message:

Application Passwords: Prevent the use of some pseudo protocols in application passwords.

Props tykoted, xknown, peterwilsoncc, jorbin, timothyblynjacobs, martinkrcho, paulkevan, dd32, ehtis.

File:

• trunk/src/wp-admin/includes/user.php (modified) (3 diffs)

trunk/src/wp-admin/includes/user.php

@@ -639 +639 @@
  * @since 5.6.0
  * @since 6.2.0 Allow insecure HTTP connections for the local environment.
+ * @since 6.3.2 Validates the success and reject URLs to prevent javascript pseudo protocol being executed.
  *
  * @param array   $request {
@@ -652 +653 @@
  */
 function wp_is_authorize_application_password_request_valid( $request, $user ) {
-        $error    = new WP_Error();
-        $is_local = 'local' === wp_get_environment_type();
-
-        if ( ! empty( $request['success_url'] ) ) {
-                $scheme = wp_parse_url( $request['success_url'], PHP_URL_SCHEME );
-
-                if ( 'http' === $scheme && ! $is_local ) {
+        $error = new WP_Error();
+
+        if ( isset( $request['success_url'] ) ) {
+                $validated_success_url = wp_is_authorize_application_redirect_url_valid( $request['success_url'] );
+                if ( is_wp_error( $validated_success_url ) ) {
                         $error->add(
-                                'invalid_redirect_scheme',
-                                __( 'The success URL must be served over a secure connection.' )
+                                $validated_success_url->get_error_code(),
+                                $validated_success_url->get_error_message()
                         );
                 }
         }
 
-        if ( ! empty( $request['reject_url'] ) ) {
-                $scheme = wp_parse_url( $request['reject_url'], PHP_URL_SCHEME );
-
-                if ( 'http' === $scheme && ! $is_local ) {
+        if ( isset( $request['reject_url'] ) ) {
+                $validated_reject_url = wp_is_authorize_application_redirect_url_valid( $request['reject_url'] );
+                if ( is_wp_error( $validated_reject_url ) ) {
                         $error->add(
-                                'invalid_redirect_scheme',
-                                __( 'The rejection URL must be served over a secure connection.' )
+                                $validated_reject_url->get_error_code(),
+                                $validated_reject_url->get_error_message()
                         );
                 }
@@ -701 +699 @@
         return true;
 }
+
+/**
+ * Validates the redirect URL protocol scheme. The protocol can be anything except http and javascript.
+ *
+ * @since 6.3.2
+ *
+ * @param string $url - The redirect URL to be validated.
+ *
+ * @return true|WP_Error True if the redirect URL is valid, a WP_Error object otherwise.
+ */
+function wp_is_authorize_application_redirect_url_valid( $url ) {
+        $bad_protocols = array( 'javascript', 'data' );
+        if ( empty( $url ) ) {
+                return true;
+        }
+
+        // Based on https://www.rfc-editor.org/rfc/rfc2396#section-3.1
+        $valid_scheme_regex = '/^[a-zA-Z][a-zA-Z0-9+.-]*:/';
+        if ( ! preg_match( $valid_scheme_regex, $url ) ) {
+                return new WP_Error(
+                        'invalid_redirect_url_format',
+                        __( 'Invalid URL format.' )
+                );
+        }
+
+        /**
+         * Filters the list of invalid protocols used in applications redirect URLs.
+         *
+         * @since 6.3.2
+         *
+         * @param string[]  $bad_protocols Array of invalid protocols.
+         * @param string    $url The redirect URL to be validated.
+         */
+        $invalid_protocols = array_map( 'strtolower', apply_filters( 'wp_authorize_application_redirect_url_invalid_protocols', $bad_protocols, $url ) );
+
+        $scheme   = wp_parse_url( $url, PHP_URL_SCHEME );
+        $host     = wp_parse_url( $url, PHP_URL_HOST );
+        $is_local = 'local' === wp_get_environment_type();
+
+        // validates if the proper URI format is applied to the $url
+        if ( empty( $host ) || empty( $scheme ) || in_array( strtolower( $scheme ), $invalid_protocols, true ) ) {
+                return new WP_Error(
+                        'invalid_redirect_url_format',
+                        __( 'Invalid URL format.' )
+                );
+        }
+
+        if ( 'http' === $scheme && ! $is_local ) {
+                return new WP_Error(
+                        'invalid_redirect_scheme',
+                        __( 'The URL must be served over a secure connection.' )
+                );
+        }
+
+        return true;
+}