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Delta Between Two Patch Sets: inject.preload.js

Issue 29590611: Issue 5953 - Bypass site CSP for script injection in Firefox (Closed)
Left Patch Set: Actually inject the right code Created Oct. 27, 2017, 4 p.m.
Right Patch Set: Add comment Created Nov. 6, 2017, 2:59 p.m.
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LEFTRIGHT
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-present eyeo GmbH 3 * Copyright (C) 2006-present 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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391 if (document instanceof HTMLDocument) 391 if (document instanceof HTMLDocument)
392 { 392 {
393 let sandbox = window.frameElement && 393 let sandbox = window.frameElement &&
394 window.frameElement.getAttribute("sandbox"); 394 window.frameElement.getAttribute("sandbox");
395 395
396 if (typeof sandbox != "string" || /(^|\s)allow-scripts(\s|$)/i.test(sandbox)) 396 if (typeof sandbox != "string" || /(^|\s)allow-scripts(\s|$)/i.test(sandbox))
397 { 397 {
398 let script = document.createElement("script"); 398 let script = document.createElement("script");
399 script.type = "application/javascript"; 399 script.type = "application/javascript";
400 script.async = false; 400 script.async = false;
401 let code = "(" + injected + ")('" + randomEventName + "');"; 401 // Firefox 58 only bypasses site CSPs when assigning to 'src'.
402 let blob = new Blob([code], { type: "text/javascript" }); 402 let url = URL.createObjectURL(new Blob([
Manish Jethani 2017/10/27 20:18:56 As per the style guide [1] we don't add spaces imm
403 let url = URL.createObjectURL(blob); 403 "(" + injected + ")('" + randomEventName + "');"
404 ]));
404 script.src = url; 405 script.src = url;
405 document.documentElement.appendChild(script); 406 document.documentElement.appendChild(script);
406 document.documentElement.removeChild(script); 407 document.documentElement.removeChild(script);
407 URL.revokeObjectURL(url); 408 URL.revokeObjectURL(url);
408 } 409 }
409 } 410 }
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