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Delta Between Two Patch Sets: include.preload.js

Issue 29347034: Issue 1727 - Prevent circumvention via WebSocket (Closed)
Left Patch Set: Throw correct exceptions if constructor is used improperly Created Aug. 9, 2016, 4:53 p.m.
Right Patch Set: Don't hardcode connection state values Created Aug. 10, 2016, 4:25 p.m.
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1 /* 1 /*
2 * This file is part of Adblock Plus <https://adblockplus.org/>, 2 * This file is part of Adblock Plus <https://adblockplus.org/>,
3 * Copyright (C) 2006-2016 Eyeo GmbH 3 * Copyright (C) 2006-2016 Eyeo GmbH
4 * 4 *
5 * Adblock Plus is free software: you can redistribute it and/or modify 5 * Adblock Plus is free software: you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 3 as 6 * it under the terms of the GNU General Public License version 3 as
7 * published by the Free Software Foundation. 7 * published by the Free Software Foundation.
8 * 8 *
9 * Adblock Plus is distributed in the hope that it will be useful, 9 * Adblock Plus is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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348 348
349 observer.observe(parentNode, {childList: true}); 349 observer.observe(parentNode, {childList: true});
350 return observer; 350 return observer;
351 } 351 }
352 352
353 function runInPage(fn, arg) 353 function runInPage(fn, arg)
354 { 354 {
355 var script = document.createElement("script"); 355 var script = document.createElement("script");
356 script.type = "application/javascript"; 356 script.type = "application/javascript";
357 script.async = false; 357 script.async = false;
358 358 script.textContent = "(" + fn + ")(" + JSON.stringify(arg) + ");";
359 // include.youtube.js passes this function a RegExp which JSON.stringify would
360 // convert to "{}".
361 if (!(arg instanceof RegExp))
362 arg = JSON.stringify(arg);
363
364 script.textContent = "(" + fn + ")(" + arg + ");";
365 document.documentElement.appendChild(script); 359 document.documentElement.appendChild(script);
366 document.documentElement.removeChild(script); 360 document.documentElement.removeChild(script);
367 } 361 }
368 362
369 function protectStyleSheet(document, style) 363 function protectStyleSheet(document, style)
370 { 364 {
371 style.id = id; 365 style.id = id;
372 366
373 runInPage(function(id) 367 runInPage(function(id)
374 { 368 {
375 var style = document.getElementById(id) || 369 var style = document.getElementById(id) ||
376 document.documentElement.shadowRoot.getElementById(id); 370 document.documentElement.shadowRoot.getElementById(id);
377 style.removeAttribute("id"); 371 style.removeAttribute("id");
378 372
379 var disableables = [style, style.sheet]; 373 var disableables = [style, style.sheet];
380 for (var i = 0; i < disableables.length; i++) 374 for (var i = 0; i < disableables.length; i++)
381 Object.defineProperty(disableables[i], "disabled", 375 Object.defineProperty(disableables[i], "disabled",
382 {value: false, enumerable: true}); 376 {value: false, enumerable: true});
383 377
384 var boundCall = Function.prototype.call.bind(Function.prototype.call);
Sebastian Noack 2016/08/09 18:05:14 I don't think that this is necessary here. We don'
kzar 2016/08/09 18:50:14 OK, I removed that again. I agree that we should
Sebastian Noack 2016/08/10 08:01:46 Interesting, so why do you do a much more elaborat
kzar 2016/08/10 08:07:33 How is it much more elaborate than what would be r
Sebastian Noack 2016/08/10 08:44:18 You are right, we'd need to patch Function.prototy
kzar 2016/08/10 10:19:44 Fair enough. How about we just go with your .bind(
385 ["deleteRule", "removeRule"].forEach(function(method) 378 ["deleteRule", "removeRule"].forEach(function(method)
386 { 379 {
387 var original = CSSStyleSheet.prototype[method]; 380 var original = CSSStyleSheet.prototype[method];
388 CSSStyleSheet.prototype[method] = function(index) 381 CSSStyleSheet.prototype[method] = function(index)
389 { 382 {
390 if (this != style.sheet) 383 if (this != style.sheet)
391 boundCall(original, this, index); 384 original.call(this, index);
392 }; 385 };
393 }); 386 });
394 }, id); 387 }, id);
395 } 388 }
396 389
397 // Neither Chrome[1] nor Safari allow us to intercept WebSockets, and therefore 390 // Neither Chrome[1] nor Safari allow us to intercept WebSockets, and therefore
398 // some ad networks are misusing them as a way to serve adverts and circumvent 391 // some ad networks are misusing them as a way to serve adverts and circumvent
399 // us. As a workaround we wrap WebSocket, preventing blocked WebSocket 392 // us. As a workaround we wrap WebSocket, preventing blocked WebSocket
400 // connections from being opened. 393 // connections from being opened.
401 // [1] - https://bugs.chromium.org/p/chromium/issues/detail?id=129353 394 // [1] - https://bugs.chromium.org/p/chromium/issues/detail?id=129353
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417 new CustomEvent(eventName + "-" + event.detail.url, {detail: block}) 410 new CustomEvent(eventName + "-" + event.detail.url, {detail: block})
418 ); 411 );
419 }); 412 });
420 }); 413 });
421 414
422 runInPage(function(eventName) 415 runInPage(function(eventName)
423 { 416 {
424 // As far as possible we must track everything we use that could be 417 // As far as possible we must track everything we use that could be
425 // sabotaged by the website later in order to circumvent us. 418 // sabotaged by the website later in order to circumvent us.
426 var RealWebSocket = WebSocket; 419 var RealWebSocket = WebSocket;
427 var closeWebSocket = RealWebSocket.prototype.close; 420 var closeWebSocket = Function.prototype.call.bind(RealWebSocket.prototype.cl ose);
428 var addEventListener = document.addEventListener.bind(document); 421 var addEventListener = document.addEventListener.bind(document);
429 var removeEventListener = document.removeEventListener.bind(document); 422 var removeEventListener = document.removeEventListener.bind(document);
430 var dispatchEvent = document.dispatchEvent.bind(document); 423 var dispatchEvent = document.dispatchEvent.bind(document);
431 var CustomEvent = window.CustomEvent; 424 var CustomEvent = window.CustomEvent;
432 var boundCall = Function.prototype.call.bind(Function.prototype.call);
433 var functionToString = Function.prototype.toString;
434 // (Safari 9 considers WebSocket to be an object rather than a function.)
435 var webSocketString = RealWebSocket.toString();
436 425
437 function checkRequest(url, callback) 426 function checkRequest(url, callback)
438 { 427 {
439 var incomingEventName = eventName + "-" + url; 428 var incomingEventName = eventName + "-" + url;
440 function listener(event) 429 function listener(event)
441 { 430 {
442 callback(event.detail); 431 callback(event.detail);
443 removeEventListener(incomingEventName, listener); 432 removeEventListener(incomingEventName, listener);
444 } 433 }
445 addEventListener(incomingEventName, listener); 434 addEventListener(incomingEventName, listener);
446 435
447 dispatchEvent(new CustomEvent(eventName, { 436 dispatchEvent(new CustomEvent(eventName, {
448 detail: {url: url} 437 detail: {url: url}
449 })); 438 }));
450 } 439 }
451 440
452 function wrappedToString()
453 {
454 if (this === WebSocket)
455 return webSocketString;
456 if (this === wrappedToString)
457 return boundCall(functionToString, functionToString);
458 return boundCall(functionToString, this);
459 };
460 Function.prototype.toString = wrappedToString;
461
462 WebSocket = function WrappedWebSocket(url, protocols) 441 WebSocket = function WrappedWebSocket(url, protocols)
463 { 442 {
464 // Throw correct exceptions if the constructor is used improperly. 443 // Throw correct exceptions if the constructor is used improperly.
465 if (!(this instanceof WrappedWebSocket)) return RealWebSocket(); 444 if (!(this instanceof WrappedWebSocket)) return RealWebSocket();
466 if (arguments.length < 1) return new RealWebSocket(); 445 if (arguments.length < 1) return new RealWebSocket();
467 446
468 var websocket = new RealWebSocket(url, protocols); 447 var websocket = new RealWebSocket(url, protocols);
469 448
470 checkRequest(websocket.url, function(blocked) 449 checkRequest(websocket.url, function(blocked)
471 { 450 {
472 if (blocked) 451 if (blocked)
473 boundCall(closeWebSocket, websocket); 452 closeWebSocket(websocket);
474 }); 453 });
475 454
476 return websocket; 455 return websocket;
477 }; 456 }.bind();
478 457
479 var properties = Object.getOwnPropertyNames(RealWebSocket); 458 Object.defineProperties(WebSocket, {
480 for (var i = 0; i < properties.length; i++) 459 CONNECTING: {value: RealWebSocket.CONNECTING, enumerable: true},
481 { 460 OPEN: {value: RealWebSocket.OPEN, enumerable: true},
482 var name = properties[i]; 461 CLOSING: {value: RealWebSocket.CLOSING, enumerable: true},
483 var desc = Object.getOwnPropertyDescriptor(RealWebSocket, name); 462 CLOSED: {value: RealWebSocket.CLOSED, enumerable: true},
484 Object.defineProperty(WebSocket, name, desc); 463 prototype: {value: RealWebSocket.prototype}
485 } 464 });
486 465
487 RealWebSocket.prototype.constructor = WebSocket; 466 RealWebSocket.prototype.constructor = WebSocket;
488 }, eventName); 467 }, eventName);
489 } 468 }
490 469
491 function init(document) 470 function init(document)
492 { 471 {
493 var shadow = null; 472 var shadow = null;
494 var style = null; 473 var style = null;
495 var observer = null; 474 var observer = null;
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660 }, true); 639 }, true);
661 640
662 return updateStylesheet; 641 return updateStylesheet;
663 } 642 }
664 643
665 if (document instanceof HTMLDocument) 644 if (document instanceof HTMLDocument)
666 { 645 {
667 checkSitekey(); 646 checkSitekey();
668 window.updateStylesheet = init(document); 647 window.updateStylesheet = init(document);
669 } 648 }
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