Added protection for audio API

_locales/de/messages.json

@@ -58,6 +58,10 @@
 		"message": "Einstellungen",
 		"description": ""
 	},
+	"section_audio-api":{
+		"message": "Audio API",
+		"description": ""
+	},
 	
 	"displayAdvancedSettings_title": {
 		"message": "Expertenmodus",
@@ -224,7 +228,7 @@
 		"message": "Blockiermodus",
 		"description": ""
 	},
-
+	
 	"urlSettings_title": {
 		"message": "Seitenspezifische Einstellungen",
 		"description": ""
@@ -289,7 +293,7 @@
 		"message": "Zufallszahlengenerator",
 		"description": ""
 	},
-
+	
 	"persistentRndStorage_title": {
 		"message": "Persistenter Speicher",
 		"description": ""
@@ -436,6 +440,10 @@
 		"message": "Auslese vorgetäuscht auf {url}",
 		"description": ""
 	},
+	"fakedAudioReadout": {
+		"message": "Audioauslese vorgetäuscht auf {url}",
+		"description": ""
+	},
 	"fakedInput": {
 		"message": "Bei Ausgabe vorgetäuscht auf {url}",
 		"description": ""
@@ -555,6 +563,75 @@
 		"description": ""
 	},
 	
+	"protectaudio_title": {
+		"message": "Audio-API beschützen",
+		"description": ""
+	},
+	"protectaudio_description": {
+		"message": "Ob die Audio-API auch beschützt werden soll.",
+		"description": ""
+	},
+	"audiofakerate_title": {
+		"message": "Buffer Vortäuschrate",
+		"description": ""
+	},
+	"audiofakerate_description": {
+		"message": "Wie viele Werte pro Leseanfrage vorgetäuscht werden sollen.",
+		"description": ""
+	},
+	"audiofakerate_options.1": {
+		"message": "1 Wert",
+		"description": ""
+	},
+	"audiofakerate_options.10": {
+		"message": "10 Werte",
+		"description": ""
+	},
+	"audiofakerate_options.100": {
+		"message": "100 Werte",
+		"description": ""
+	},
+	"audiofakerate_options.1000": {
+		"message": "1000 Werte",
+		"description": ""
+	},
+	"audiofakerate_options.0.1%": {
+		"message": "0.1% der Werte",
+		"description": ""
+	},
+	"audiofakerate_options.1%": {
+		"message": "1% der Werte",
+		"description": ""
+	},
+	"audionoiselevel_title": {
+		"message": "Rauschlevel",
+		"description": ""
+	},
+	"audionoiselevel_description": {
+		"message": "",
+		"description": ""
+	},
+	"audionoiselevel_options.minimal": {
+		"message": "minimal",
+		"description": ""
+	},
+	"audionoiselevel_options.low": {
+		"message": "niedrig",
+		"description": ""
+	},
+	"audionoiselevel_options.medium": {
+		"message": "mittel",
+		"description": ""
+	},
+	"audionoiselevel_options.high": {
+		"message": "hoch",
+		"description": ""
+	},
+	"audionoiselevel_options.maximal": {
+		"message": "maximal",
+		"description": ""
+	},
+	
 	"showReleaseNotes_title": {
 		"message": "Versionsinformationen",
 		"description": ""
@@ -600,7 +677,7 @@
 		"message": "ausführlich",
 		"description": ""
 	},
-
+	
 	"exportSettings_title": {
 		"message": "Einstellungen exportieren",
 		"description": ""

_locales/en/messages.json

@@ -7,7 +7,7 @@
 		"message": "Changes the JS-API for modifying <canvas> to prevent Canvas-Fingerprinting.",
 		"description": ""
 	},
-
+	
 	"more": {
 		"message": "more",
 		"description": ""
@@ -58,6 +58,10 @@
 		"message": "Settings",
 		"description": ""
 	},
+	"section_audio-api":{
+		"message": "Audio API",
+		"description": ""
+	},
 	
 	"displayAdvancedSettings_title": {
 		"message": "Expert mode",
@@ -246,7 +250,7 @@
 		"message": "Input domain or URL RegExp:",
 		"description": ""
 	},
-
+	
 	"minFakeSize_description": {
 		"message": "Canvas with a smaller or equal area than this number will not be faked. This is a parameter to prevent detection.\nCAUTION: This lowers the safety of the addon, therefore it is highly recommended not to set this value above 100.",
 		"description": ""
@@ -402,7 +406,7 @@
 		"message": "Allows certain parts of the canvas API.",
 		"description": ""
 	},
-
+	
 	"disableNotifications": {
 		"message": "disable notifications",
 		"description": ""
@@ -436,6 +440,10 @@
 		"message": "Faked readout on {url}",
 		"description": ""
 	},
+	"fakedAudioReadout": {
+		"message": "Faked audio readout on {url}",
+		"description": ""
+	},
 	"fakedInput": {
 		"message": "Faked at input on {url}",
 		"description": ""
@@ -555,6 +563,75 @@
 		"description": ""
 	},
 	
+	"protectaudio_title": {
+		"message": "Protect audio API",
+		"description": ""
+	},
+	"protectaudio_description": {
+		"message": "If the audio API should be protected as well",
+		"description": ""
+	},
+	"audiofakerate_title": {
+		"message": "Buffer fake rate",
+		"description": ""
+	},
+	"audiofakerate_description": {
+		"message": "How many of the values per read request should be faked.",
+		"description": ""
+	},
+	"audiofakerate_options.1": {
+		"message": "1 value",
+		"description": ""
+	},
+	"audiofakerate_options.10": {
+		"message": "10 values",
+		"description": ""
+	},
+	"audiofakerate_options.100": {
+		"message": "100 values",
+		"description": ""
+	},
+	"audiofakerate_options.1000": {
+		"message": "1000 values",
+		"description": ""
+	},
+	"audiofakerate_options.0.1%": {
+		"message": "0.1% of the values",
+		"description": ""
+	},
+	"audiofakerate_options.1%": {
+		"message": "1% of the values",
+		"description": ""
+	},
+	"audionoiselevel_title": {
+		"message": "Noise level",
+		"description": ""
+	},
+	"audionoiselevel_description": {
+		"message": "",
+		"description": ""
+	},
+	"audionoiselevel_options.minimal": {
+		"message": "minimal",
+		"description": ""
+	},
+	"audionoiselevel_options.low": {
+		"message": "low",
+		"description": ""
+	},
+	"audionoiselevel_options.medium": {
+		"message": "medium",
+		"description": ""
+	},
+	"audionoiselevel_options.high": {
+		"message": "high",
+		"description": ""
+	},
+	"audionoiselevel_options.maximal": {
+		"message": "maximal",
+		"description": ""
+	},
+	
 	"showReleaseNotes_title": {
 		"message": "Release notes",
 		"description": ""
@@ -613,7 +690,7 @@
 		"message": "Show",
 		"description": ""
 	},
-
+	
 	"resetSettings_title": {
 		"message": "Reset settings",
 		"description": ""

lib/modifiedAPI.js

@@ -17,6 +17,7 @@
 	const logging = require("./logging");
 	const {copyCanvasToWebgl} = require("./webgl");
 	const getWrapped = require("sdk/getWrapped");
+	const modifiedAudioAPI = require("./modifiedAudioAPI");
 	
 	var randomSupply = null;
 	
@@ -156,6 +157,7 @@
 	
 	scope.setRandomSupply = function(supply){
 		randomSupply = supply;
+		modifiedAudioAPI.setRandomSupply(supply);
 	};
 	var canvasContextType = new WeakMap();
 	// changed functions and their fakes
@@ -441,4 +443,7 @@
 			}
 		}
 	};
+	Object.keys(modifiedAudioAPI.changedFunctions).forEach(function(key){
+		scope.changedFunctions[key] = modifiedAudioAPI.changedFunctions[key];
+	});
 }());

lib/modifiedAudioAPI.js

@@ -0,0 +1,191 @@
+/* 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/. */
+(function(){
+	"use strict";
+	
+	var scope;
+	if ((typeof exports) !== "undefined"){
+		scope = exports;
+	}
+	else {
+		window.scope.modifiedAudioAPI = {};
+		scope = window.scope.modifiedAudioAPI;
+	}
+	
+	const logging = require("./logging");
+	const getWrapped = require("sdk/getWrapped");
+	
+	var randomSupply = null;
+	
+	const audioFakeRate = {
+		"1": function(array){return 1;},
+		"10": function(array){return 10;},
+		"100": function(array){return 100;},
+		"1000": function(array){return 1000;},
+		"0.1%": function(array){return array.length / 1000;},
+		"1%": function(array){return array.length / 100;},
+	};
+	function getAudioFakeRate(array, prefs){
+		var func = audioFakeRate[prefs("audioFakeRate")];
+		if (typeof func === "function"){
+			return func(array);
+		}
+		else {
+			return 10;
+		}
+	}
+	const audioNoiseLevel = {
+		"minimal": 0.0000001,
+		"low": 0.00001,
+		"medium": 0.001,
+		"high": 0.01,
+		"maximal": 0.1
+	};
+	function getAudioNoiseLevel(prefs){
+		return audioNoiseLevel[prefs("audioNoiseLevel")] || 0.0000001;
+	}
+	
+	function fakeFloat32Array(array, window, prefs){
+		if (prefs("protectAudio")){
+			var l = array.length;
+			var rate = getAudioFakeRate(array, prefs);
+			var noiseLevel = getAudioNoiseLevel(prefs);
+			var indexRng = randomSupply.getIndexRng(rate, l, window);
+			var rng = randomSupply.getRng(rate, window);
+			for (var i = 0; i < rate; i += 1){
+				var index = indexRng(i);
+				array[index] += (rng(i) / 0xffffffff - 0.5) * noiseLevel;
+			}
+		}
+	}
+	function fakeUint8Array(array, window, prefs){
+		if (prefs("protectAudio")){
+			var l = array.length;
+			var rate = getAudioFakeRate(array, prefs);
+			var indexRng = randomSupply.getIndexRng(rate, l, window);
+			var rng = randomSupply.getValueRng(rate, window);
+			for (var i = 0; i < rate; i += 1){
+				var index = indexRng(i);
+				array[index] = rng(array[index], i);
+			}
+		}
+	}
+	
+	function hasType(status, type){
+		return status.type.indexOf(type) !== -1;
+	}
+	
+	scope.setRandomSupply = function(supply){
+		randomSupply = supply;
+	};
+	
+	function getStatus(obj, status){
+		status = Object.create(status);
+		status.active = hasType(status, "readout");
+		return status;
+	}
+	
+	let notified = false;
+	function notifyOnce(notify){
+		if (!notified){
+			notify("fakedAudioReadout");
+			notified = true;
+		}
+	}
+	// changed functions and their fakes
+	scope.changedFunctions = {
+		getFloatFrequencyData: {
+			type: "readout",
+			getStatus: getStatus,
+			object: ["AnalyserNode"],
+			fakeGenerator: function(prefs, notify, window, original){
+				return function getFloatFrequencyData(array){
+					notifyOnce(notify);
+					var ret = original.apply(this, window.Array.from(arguments));
+					fakeFloat32Array(array, window, prefs);
+					return ret;
+				};
+			}
+		},
+		getByteFrequencyData: {
+			type: "readout",
+			getStatus: getStatus,
+			object: ["AnalyserNode"],
+			fakeGenerator: function(prefs, notify, window, original){
+				return function getByteFrequencyData(array){
+					notifyOnce(notify);
+					var ret = original.apply(this, window.Array.from(arguments));
+					fakeUint8Array(array, window, prefs);
+					return ret;
+				};
+			}
+		},
+		getFloatTimeDomainData: {
+			type: "readout",
+			getStatus: getStatus,
+			object: ["AnalyserNode"],
+			fakeGenerator: function(prefs, notify, window, original){
+				return function getFloatTimeDomainData(array){
+					notifyOnce(notify);
+					var ret = original.apply(this, window.Array.from(arguments));
+					fakeFloat32Array(array, window, prefs);
+					return ret;
+				};
+			}
+		},
+		getByteTimeDomainData: {
+			type: "readout",
+			getStatus: getStatus,
+			object: ["AnalyserNode"],
+			fakeGenerator: function(prefs, notify, window, original){
+				return function getByteTimeDomainData(array){
+					notifyOnce(notify);
+					var ret = original.apply(this, window.Array.from(arguments));
+					fakeUint8Array(array, window, prefs);
+					return ret;
+				};
+			}
+		},
+		getChannelData: {
+			type: "readout",
+			getStatus: getStatus,
+			object: ["AudioBuffer"],
+			fakeGenerator: function(prefs, notify, window, original){
+				return function getChannelData(channel){
+					notifyOnce(notify);
+					var ret = original.apply(this, window.Array.from(arguments));
+					fakeFloat32Array(ret, window, prefs);
+					return ret;
+				};
+			}
+		},
+		copyFromChannel: {
+			type: "readout",
+			getStatus: getStatus,
+			object: ["AudioBuffer"],
+			fakeGenerator: function(prefs, notify, window, original){
+				return function copyFromChannel(destination, channelNumber, startInChannel){
+					notifyOnce(notify);
+					var ret = original.apply(this, window.Array.from(arguments));
+					fakeFloat32Array(destination, window, prefs);
+					return ret;
+				};
+			}
+		},
+		getFrequencyResponse: {
+			type: "readout",
+			getStatus: getStatus,
+			object: ["BiquadFilterNode", "IIRFilterNode"],
+			fakeGenerator: function(prefs, notify, window, original){
+				return function getFrequencyResponse(frequencyArray, magResponseOutput, phaseResponseOutput){
+					notifyOnce(notify);
+					var ret = original.apply(this, window.Array.from(arguments));
+					fakeFloat32Array(magResponseOutput, window, prefs);
+					fakeFloat32Array(phaseResponseOutput, window, prefs);
+					return ret;
+				};
+			}
+		},
+	};
+}());

lib/settingDefinitions.js

@@ -67,7 +67,10 @@
 				"toDataURL", "toBlob", "mozGetAsFile", "getImageData",
 				"isPointInPath", "isPointInStroke",
 				"fillText", "strokeText",
-				"readPixels"
+				"readPixels",
+				"getFloatFrequencyData", "getByteFrequencyData", "getFloatTimeDomainData", "getByteTimeDomainData",
+				"getChannelData", "copyFromChannel",
+				"getFrequencyResponse"
 			],
 			defaultKeyValue: false
 		},
@@ -155,6 +158,20 @@
 			name: "stackList",
 			defaultValue: ""
 		},
+		{
+			name: "protectAudio",
+			defaultValue: true
+		},
+		{
+			name: "audioFakeRate",
+			defaultValue: "10",
+			options: ["1", "10", "100", "1000", "0.1%", "1%"]
+		},
+		{
+			name: "audioNoiseLevel",
+			defaultValue: "low",
+			options: ["minimal", "low", "medium", "high", "maximal"]
+		},
 		{
 			name: "displayAdvancedSettings",
 			defaultValue: false

manifest.json

@@ -1,3 +1,4 @@
+
 {
 	"name": "CanvasBlocker",
 	"description": "__MSG_addon_description__",
@@ -30,6 +31,7 @@
 			
 			"lib/colorStatistics.js",
 			"lib/webgl.js",
+			"lib/modifiedAudioAPI.js",
 			"lib/modifiedAPI.js",
 			"lib/randomSupplies.js",
 			"lib/intercept.js",

options/settingsDisplay.js

@@ -292,6 +292,24 @@
 				"displayAdvancedSettings": [true]
 			}
 		},
+		"Audio-API",
+		{
+			"name": "protectAudio"
+		},
+		{
+			"name": "audioFakeRate",
+			"displayDependencies": {
+				"protectAudio": [true],
+				"displayAdvancedSettings": [true]
+			}
+		},
+		{
+			"name": "audioNoiseLevel",
+			"displayDependencies": {
+				"protectAudio": [true],
+				"displayAdvancedSettings": [true]
+			}
+		},
 		"misc",
 		{
 			"name": "showReleaseNotes"

releaseNotes.txt

@@ -1,9 +1,9 @@
 Version 0.4.6:
 	changes:
-		-
+		- Changes in the random supply API
 	
 	new features:
-		-
+		- Can protect Audio API
 	
 	fixes:
 		-