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mgolmgol
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Attributes: Don't stringify attributes in the setter
Stringifying attributes in the setter was needed for IE <=9 but it breaks trusted types enforcement when setting a script `src` attribute. Note that this doesn't mean script execution works. Since jQuery disables all scripts by changing their type and then executes them by creating fresh script tags with proper `src` & possibly other attributes, this unwraps any trusted `src` wrappers, making the script not execute under strict CSP settings. We might try to fix it in the future in a separate change. Fixes gh-4948 Closes gh-4949
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6 files changed

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‎src/attributes/attr.js‎

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Original file line numberDiff line numberDiff line change
@@ -50,7 +50,7 @@ jQuery.extend( {
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return ret;
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}
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elem.setAttribute( name, value + "" );
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elem.setAttribute( name, value );
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return value;
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}
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‎test/data/mock.php‎

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@@ -247,6 +247,12 @@ protected function trustedHtml( $req ) {
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echo file_get_contents( __DIR__ . '/trusted-html.html' );
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}
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protected function trustedTypesAttributes( $req ) {
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header( "Content-Security-Policy: require-trusted-types-for 'script'; report-uri ./mock.php?action=cspLog" );
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header( 'Content-type: text/html' );
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echo file_get_contents( __DIR__ . '/trusted-types-attributes.html' );
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}
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protected function errorWithScript( $req ) {
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header( 'HTTP/1.0 404 Not Found' );
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if ( isset( $req->query['withScriptContentType'] ) ) {

‎test/data/trusted-types-attributes.html‎

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@@ -0,0 +1,61 @@
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<!DOCTYPE html>
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<html>
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<head>
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<meta charset=utf-8 />
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<title>Trusted HTML attribute tests</title>
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</head>
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<body>
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<div id="qunit-fixture"></div>
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<script src="../../dist/jquery.js"></script>
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<script src="iframeTest.js"></script>
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<script>
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var i, input, elem, policy,
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results = [];
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function runTests( messagePrefix, getTrustedScriptUrlWrapper ) {
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try {
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elem = jQuery( "<script><\/script>" )
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.attr( "src", getTrustedScriptUrlWrapper( "trusted-types-attributes.js" ) );
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elem.appendTo( document.body );
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results.push( {
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actual: elem.attr( "src" ),
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expected: "trusted-types-attributes.js",
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message: messagePrefix + ": script URL properly set"
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} );
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} catch ( e ) {
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results.push( {
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actual: "error thrown",
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expected: "",
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message: messagePrefix + ": error has been thrown"
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} );
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}
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}
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if ( typeof trustedTypes !== "undefined" ) {
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policy = trustedTypes.createPolicy( "jquery-test-policy", {
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createScriptURL: function( html ) {
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return html;
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}
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} );
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runTests( "TrustedScriptURL", function wrapInTrustedScriptUrl( input ) {
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return policy.createScriptURL( input );
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} );
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} else {
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// No TrustedScriptURL support so let's at least run tests with object wrappers
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// with a proper `toString` function. See trusted-html.html for more context.
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runTests( "Object wrapper", function( input ) {
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return {
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toString: function toString() {
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return input;
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}
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};
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} );
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}
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startIframeTest( results );
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</script>
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</body>
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</html>

‎test/data/trusted-types-attributes.js‎

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Original file line numberDiff line numberDiff line change
@@ -0,0 +1 @@
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window.testMessage = "script run";

‎test/middleware-mockserver.js‎

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Original file line numberDiff line numberDiff line change
@@ -264,6 +264,14 @@ var mocks = {
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var body = fs.readFileSync( __dirname + "/data/trusted-html.html" ).toString();
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resp.end( body );
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},
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trustedTypesAttributes: function( req, resp ) {
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resp.writeHead( 200, {
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"Content-Type": "text/html",
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"Content-Security-Policy": "require-trusted-types-for 'script'; report-uri /base/test/data/mock.php?action=cspLog"
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} );
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var body = fs.readFileSync( __dirname + "/data/trusted-types-attributes.html" ).toString();
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resp.end( body );
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},
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errorWithScript: function( req, resp ) {
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if ( req.query.withScriptContentType ) {
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resp.writeHead( 404, { "Content-Type": "application/javascript" } );

‎test/unit/attributes.js‎

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Original file line numberDiff line numberDiff line change
@@ -1764,3 +1764,23 @@ QUnit.test( "non-lowercase boolean attribute getters should not crash", function
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}
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} );
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} );
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// Test trustedTypes support in browsers where they're supported (currently Chrome 83+).
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// Browsers with no TrustedScriptURL support still run tests on object wrappers with
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// a proper `toString` function.
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testIframe(
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"Basic TrustedScriptURL support (gh-4948)",
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"mock.php?action=trustedTypesAttributes",
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function( assert, jQuery, window, document, test ) {
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var done = assert.async();
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assert.expect( 1 );
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test.forEach( function( result ) {
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assert.deepEqual( result.actual, result.expected, result.message );
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} );
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supportjQuery.get( baseURL + "mock.php?action=cspClean" ).then( done );
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}
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);

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