Tests: Strip untypical callback parameter characters from mock.php

mgol · web-flow · commit a70274632dc1 · 2021-04-13T22:13:48.000+02:00
Only allow alphanumeric characters & underscores for callback parameters. The change is done both for the PHP server as well as the Node.js-based version. This is only test code so we're not fixing any security issue but it happens often enough that the whole jQuery repository directory structure is deployed onto the server with PHP enabled that it makes is easy to introduce security issues if this cleanup is not done. Ref gh-4764 Closes gh-4871
diff --git a/test/data/mock.php b/test/data/mock.php
@@ -1,7 +1,12 @@
 <?php
+
 /**
  * Keep in sync with /test/middleware-mockserver.js
  */
+function cleanCallback( $callback ) {
+	return preg_replace( '/[^a-z0-9_]/i', '', $callback );
+}
+
 class MockServer {
 	protected function contentType( $req ) {
 		$type = $req->query['contentType'];
@@ -65,7 +70,8 @@ protected function script( $req ) {
 				array_values( $req->headers )
 			);
 
-			echo $req->query['callback'] . "(" . json_encode( [ 'headers' => $headers ] ) . ")";
+			echo cleanCallback( $req->query['callback'] ) .
+				"(" . json_encode( [ 'headers' => $headers ] ) . ")";
 		} else {
 			echo 'QUnit.assert.ok( true, "mock executed" );';
 		}
@@ -105,17 +111,17 @@ protected function jsonp( $req ) {
 		} else {
 			$callback = $_POST['callback'];
 		}
-		if ( isset( $req->query['array'] ) ) {
-			echo $callback . '([ {"name": "John", "age": 21}, {"name": "Peter", "age": 25 } ])';
-		} else {
-			echo $callback . '({ "data": {"lang": "en", "length": 25} })';
-		}
+		$json = isset( $req->query['array'] ) ?
+			'[ { "name": "John", "age": 21 }, { "name": "Peter", "age": 25 } ]' :
+			'{ "data": { "lang": "en", "length": 25 } }';
+		echo cleanCallback( $callback ) . '(' . $json . ')';
 	}
 
 	protected function xmlOverJsonp( $req ) {
 		$callback = $_REQUEST['callback'];
+		$cleanCallback = cleanCallback( $callback );
 		$text = json_encode( file_get_contents( __DIR__ . '/with_fries.xml' ) );
-		echo "$callback($text)\n";
+		echo "$cleanCallback($text)\n";
 	}
 
 	protected function error( $req ) {
@@ -243,7 +249,7 @@ protected function errorWithScript( $req ) {
 		}
 		if ( isset( $req->query['callback'] ) ) {
 			$callback = $req->query['callback'];
-			echo $callback . '( {"status": 404, "msg": "Not Found"} )';
+			echo cleanCallback( $callback ) . '( {"status": 404, "msg": "Not Found"} )';
 		} else {
 			echo 'QUnit.assert.ok( false, "Mock return erroneously executed" );';
 		}
diff --git a/test/middleware-mockserver.js b/test/middleware-mockserver.js
@@ -7,6 +7,10 @@ var cspLog = "";
 /**
  * Keep in sync with /test/mock.php
  */
+function cleanCallback( callback ) {
+	return callback.replace( /[^a-z0-9_]/gi, "" );
+}
+
 var mocks = {
 	contentType: function( req, resp ) {
 		resp.writeHead( 200, {
@@ -73,7 +77,7 @@ var mocks = {
 		}
 
 		if ( req.query.callback ) {
-			resp.end( req.query.callback + "(" + JSON.stringify( {
+			resp.end( cleanCallback( req.query.callback ) + "(" + JSON.stringify( {
 				headers: req.headers
 			} ) + ")" );
 		} else {
@@ -126,14 +130,14 @@ var mocks = {
 				{ data: { lang: "en", length: 25 } }
 			);
 		callback.then( function( cb ) {
-			resp.end( cb + "(" + json + ")" );
+			resp.end( cleanCallback( cb ) + "(" + json + ")" );
 		}, next );
 	},
 	xmlOverJsonp: function( req, resp ) {
 		var callback = req.query.callback;
 		var body = fs.readFileSync( __dirname + "/data/with_fries.xml" ).toString();
 		resp.writeHead( 200 );
-		resp.end( callback + "(" + JSON.stringify( body ) + ")\n" );
+		resp.end( cleanCallback( callback ) + "(" + JSON.stringify( body ) + ")\n" );
 	},
 	error: function( req, resp ) {
 		if ( req.query.json ) {
@@ -256,10 +260,11 @@ var mocks = {
 		if ( req.query.withScriptContentType ) {
 			resp.writeHead( 404, { "Content-Type": "application/javascript" } );
 		} else {
-			resp.writeHead( 404 );
+			resp.writeHead( 404, { "Content-Type": "text/html; charset=UTF-8" } );
 		}
 		if ( req.query.callback ) {
-			resp.end( req.query.callback + "( {\"status\": 404, \"msg\": \"Not Found\"} )" );
+			resp.end( cleanCallback( req.query.callback ) +
+				"( {\"status\": 404, \"msg\": \"Not Found\"} )" );
 		} else {
 			resp.end( "QUnit.assert.ok( false, \"Mock return erroneously executed\" );" );
 		}
