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Diffstat (limited to 'data/extensions/jsr@javascriptrestrictor/wrappingS-MCS.js')
| -rw-r--r-- | data/extensions/jsr@javascriptrestrictor/wrappingS-MCS.js | 167 |
1 files changed, 0 insertions, 167 deletions
diff --git a/data/extensions/jsr@javascriptrestrictor/wrappingS-MCS.js b/data/extensions/jsr@javascriptrestrictor/wrappingS-MCS.js deleted file mode 100644 index a475221..0000000 --- a/data/extensions/jsr@javascriptrestrictor/wrappingS-MCS.js +++ /dev/null @@ -1,167 +0,0 @@ -/** \file - * \brief Wrappers for Media Capture and Streams standard - * - * \see https://www.w3.org/TR/mediacapture-streams/ - * - * \author Copyright (C) 2021 Libor Polcak - * \author Copyright (C) 2021 Matus Svancar - * - * \license SPDX-License-Identifier: GPL-3.0-or-later - * \license SPDX-License-Identifier: MPL-2.0 - */ -// -// This program is free software: you can redistribute it and/or modify -// it under the terms of the GNU General Public License as published by -// the Free Software Foundation, either version 3 of the License, or -// (at your option) any later version. -// -// This program is distributed in the hope that it will be useful, -// but WITHOUT ANY WARRANTY; without even the implied warranty of -// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the -// GNU General Public License for more details. -// -// You should have received a copy of the GNU General Public License -// along with this program. If not, see <https://www.gnu.org/licenses/>. -// -// Alternatively, the contents of this file may be used under the terms -// of the Mozilla Public License, v. 2.0, as described below: -// -// This Source Code Form is subject to the terms of the Mozilla Public -// License, v. 2.0. If a copy of the MPL was not distributed with this file, -// You can obtain one at http://mozilla.org/MPL/2.0/. -// -// \copyright Copyright (c) 2020 The Brave Authors. - -/** \file - * This file contains wrapper for MediaDevices.enumerateDevices https://developer.mozilla.org/en-US/docs/Web/API/MediaDevices/enumerateDevices - * \ingroup wrappers - * - * The goal is to prevent fingerprinting by modifying return value of enumerateDevices. - * - * This wrapper operates with three levels of protection: - * - * * (0) - return promise with shuffled array - * * (1) - return promise with shuffled array with additional 0-4 fake devices - * * (2) - return empty promise - * - * The shuffling approach is inspired by the algorithms created by [Brave Software](https://brave.com) - * available [here](https://github.com/brave/brave-core/blob/master/chromium_src/third_party/blink/renderer/modules/mediastream/media_devices.cc). - */ -/* - -/* - * Create private namespace - */ -(function() { - /** - * \brief change reurn value of enumerateDevices - * - * Depending on level chosen this function returns: - * * (0,1) - promise with modified device array - * * (2) - empty promise - */ - function farbleEnumerateDevices() { - // to emulate correctly we need a fresh Promise and a fresh Array (with same values) on every call - return cachedDevices.then(r => { - r = r.concat(); - return r; - }); - } - /** - * \brief create and return MediaDeviceInfo object by overlaying a native one with fake properties - * - * \param device Device is any native MediaInfoDevice object (https://developer.mozilla.org/en-US/docs/Web/API/MediaDeviceInfo) - * \param fd_prng Initialized PRNG to be deterministically used by the function - */ - function fakeDevice(device, fd_prng){ - var kinds = ["videoinput", "audioinput", "audiooutput"]; - // browserEnum specifies the browser: 0 - Chrome 1 - Firefox - let browserEnum = device.groupId.length == 44 ? 1 : 0; - var deviceId = browserEnum == 1 ? randomString(43, browserEnum, fd_prng)+ "=" : ""; - let fakeData = { - deviceId, - groupId: deviceRandomString(browserEnum), - kind: kinds[Math.floor(fd_prng() * 3)], - label: "", - }; - let json = JSON.stringify(fakeData); - fakeData.toJSON = () => json; - let overlay = WrapHelper.overlay(device, fakeData); - return overlay; - } - /** - * \brief return random string for MediaDeviceInfo parameters - * - * \param browserEnum enum specifying browser 0 - Chrome 1 - Firefox - */ - function deviceRandomString(browserEnum) { - var ret = ""; - var lengths = [64, 43]; - var charSets = ["abcdefghijklmnopqrstuvwxyz0123456789","abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789+/"]; - var length = lengths[browserEnum]; - var charSet = charSets[browserEnum]; - for ( var i = 0; i < length; i++ ) { - ret += charSet.charAt(Math.floor(Math.random() * charSet.length)); - } - if(browserEnum == 1) - ret += "="; - return ret; - } - var wrappers = [ - { - parent_object: "MediaDevices.prototype", - parent_object_property: "enumerateDevices", - wrapped_objects: [{ - original_name: "MediaDevices.prototype.enumerateDevices", - callable_name: "origEnumerateDevices", - }], - helping_code: farbleEnumerateDevices + shuffleArray + deviceRandomString + randomString + fakeDevice + ` - var fd_prng = alea(domainHash, "S-MCS MediaDevices.prototype.enumerateDevices"); - let [level] = args; - let cachedDevices = level < 2 ? - origEnumerateDevices.call(navigator.mediaDevices).then(result => { - try { - let shuffle = () => { - if (result.length > 1) shuffleArray(result); - return result; - }; - if (level === 1 && result.length) { - var enumd_prng = alea(domainHash, "MediaDevices.prototype.enumerateDevices"); - let additional = Math.floor(enumd_prng()*4); - if (additional > 0) { - let adding = []; - while (additional-- > 0) { - adding.push(origEnumerateDevices.call(navigator.mediaDevices).then(([device]) => { - let fake = fakeDevice(device, fd_prng); - result.push(fake); - })); - } - return Promise.all(adding).then(r => { - return shuffle(); - }); - } - } - return shuffle(); - } catch (e) { - console.error("Error in farble promise callback", e); - throw e; - } - }) - : Promise.resolve([]); - `, - wrapping_function_args: "", - /** \fn fake MediaDevices.prototype.enumerateDevices - * \brief Modifies return value - * - * Depending on level chosen this function returns: - * * (0) - promise with shuffled array - * * (1) - promise with shuffled array with additional 0-4 fake devices - * * (2) - empty promise - */ - wrapping_function_body: ` - return farbleEnumerateDevices(); - `, - }, - ] - add_wrappers(wrappers); -})() |