security-and-privacy/CanvasBlocker
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Hide function replacement

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Fixes #206
This commit is contained in:
kkapsner 2018-07-13 16:58:13 +02:00
parent 9711c67c3f
commit 26529a3653
6 changed files with 375 additions and 281 deletions
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295
lib/modifiedAPI.js
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@ -17,6 +17,7 @@
const logging = require("./logging");
const {copyCanvasToWebgl} = require("./webgl");
const getWrapped = require("sdk/getWrapped");
const {hasType, checkerWrapper} = require("./modifiedAPIFunctions");
const modifiedAudioAPI = require("./modifiedAudioAPI");
var randomSupply = null;
@ -151,10 +152,6 @@
}
}
function hasType(status, type){
return status.type.indexOf(type) !== -1;
}
scope.setRandomSupply = function(supply){
randomSupply = supply;
modifiedAudioAPI.setRandomSupply(supply);
@ -186,10 +183,13 @@
}
},
object: "HTMLCanvasElement",
fakeGenerator: function(prefs, notify, window, original){
fakeGenerator: function(checker){
return function(context, contextAttributes){
canvasContextType.set(this, context);
return original.apply(this, window.Array.from(arguments));
return checkerWrapper(checker, this, arguments, function(args, check){
var {prefs, notify, window, original} = check;
canvasContextType.set(this, context);
return original.apply(this, window.Array.from(args));
});
};
}
},
@ -205,18 +205,21 @@
return status;
},
object: "HTMLCanvasElement",
fakeGenerator: function(prefs, notify, window, original){
fakeGenerator: function(checker){
return function toDataURL(){
if (canvasSizeShouldBeFaked(this, prefs)){
var fakeCanvas = getFakeCanvas(window, this, prefs);
if (fakeCanvas !== this){
notify.call(this, "fakedReadout");
return checkerWrapper(checker, this, arguments, function(args, check){
var {prefs, notify, window, original} = check;
if (canvasSizeShouldBeFaked(this, prefs)){
var fakeCanvas = getFakeCanvas(window, this, prefs);
if (fakeCanvas !== this){
notify.call(this, "fakedReadout");
}
return original.apply(fakeCanvas, window.Array.from(args));
}
return original.apply(fakeCanvas, window.Array.from(arguments));
}
else {
return original.apply(this, window.Array.from(arguments));
}
else {
return original.apply(this, window.Array.from(args));
}
});
};
}
},
@ -232,18 +235,21 @@
return status;
},
object: "HTMLCanvasElement",
fakeGenerator: function(prefs, notify, window, original){
fakeGenerator: function(checker){
return function toBlob(callback){
if (canvasSizeShouldBeFaked(this, prefs)){
var fakeCanvas = getFakeCanvas(window, this, prefs);
if (fakeCanvas !== this){
notify.call(this, "fakedReadout");
return checkerWrapper(checker, this, arguments, function(args, check){
var {prefs, notify, window, original} = check;
if (canvasSizeShouldBeFaked(this, prefs)){
var fakeCanvas = getFakeCanvas(window, this, prefs);
if (fakeCanvas !== this){
notify.call(this, "fakedReadout");
}
return original.apply(fakeCanvas, window.Array.from(args));
}
return original.apply(fakeCanvas, window.Array.from(arguments));
}
else {
return original.apply(this, window.Array.from(arguments));
}
else {
return original.apply(this, window.Array.from(args));
}
});
};
},
exportOptions: {allowCallbacks: true}
@ -260,18 +266,21 @@
return status;
},
object: "HTMLCanvasElement",
fakeGenerator: function(prefs, notify, window, original){
fakeGenerator: function(checker){
return function mozGetAsFile(callback){
if (canvasSizeShouldBeFaked(this, prefs)){
var fakeCanvas = getFakeCanvas(window, this, prefs);
if (fakeCanvas !== this){
notify.call(this, "fakedReadout");
return checkerWrapper(checker, this, arguments, function(args, check){
var {prefs, notify, window, original} = check;
if (canvasSizeShouldBeFaked(this, prefs)){
var fakeCanvas = getFakeCanvas(window, this, prefs);
if (fakeCanvas !== this){
notify.call(this, "fakedReadout");
}
return original.apply(fakeCanvas, window.Array.from(args));
}
return original.apply(fakeCanvas, window.Array.from(arguments));
}
else {
return original.apply(this, window.Array.from(arguments));
}
else {
return original.apply(this, window.Array.from(args));
}
});
};
}
},
@ -283,26 +292,29 @@
return status;
},
object: "CanvasRenderingContext2D",
fakeGenerator: function(prefs, notify, window, original){
fakeGenerator: function(checker){
return function getImageData(sx, sy, sw, sh){
if (!this || canvasSizeShouldBeFaked(this.canvas, prefs)){
var fakeCanvas;
var context = this;
if (this && this.canvas) {
fakeCanvas = getFakeCanvas(window, this.canvas, prefs);
return checkerWrapper(checker, this, arguments, function(args, check){
var {prefs, notify, window, original} = check;
if (!this || canvasSizeShouldBeFaked(this.canvas, prefs)){
var fakeCanvas;
var context = this;
if (this && this.canvas) {
fakeCanvas = getFakeCanvas(window, this.canvas, prefs);
}
if (fakeCanvas && fakeCanvas !== this.canvas){
notify.call(this, "fakedReadout");
context = window.HTMLCanvasElement.prototype.getContext.call(
fakeCanvas,
"2d"
);
}
return original.apply(context, window.Array.from(args));
}
if (fakeCanvas && fakeCanvas !== this.canvas){
notify.call(this, "fakedReadout");
context = window.HTMLCanvasElement.prototype.getContext.call(
fakeCanvas,
"2d"
);
else {
return original.apply(this, window.Array.from(args));
}
return original.apply(context, window.Array.from(arguments));
}
else {
return original.apply(this, window.Array.from(arguments));
}
});
};
}
},
@ -314,18 +326,21 @@
return status;
},
object: "CanvasRenderingContext2D",
fakeGenerator: function(prefs, notify, window, original){
fakeGenerator: function(checker){
return function isPointInPath(x, y){
var rng = randomSupply.getValueRng(1, window);
var originalValue = original.apply(this, window.Array.from(arguments));
if ((typeof originalValue) === "boolean"){
notify.call(this, "fakedReadout");
var index = x + this.width * y;
return original.call(this, rng(x, index), rng(y, index));
}
else {
return originalValue;
}
return checkerWrapper(checker, this, arguments, function(args, check){
var {prefs, notify, window, original} = check;
var rng = randomSupply.getValueRng(1, window);
var originalValue = original.apply(this, window.Array.from(args));
if ((typeof originalValue) === "boolean"){
notify.call(this, "fakedReadout");
var index = x + this.width * y;
return original.call(this, rng(x, index), rng(y, index));
}
else {
return originalValue;
}
});
};
}
},
@ -337,18 +352,21 @@
return status;
},
object: "CanvasRenderingContext2D",
fakeGenerator: function(prefs, notify, window, original){
fakeGenerator: function(checker){
return function isPointInStroke(x, y){
var rng = randomSupply.getValueRng(1, window);
var originalValue = original.apply(this, window.Array.from(arguments));
if ((typeof originalValue) === "boolean"){
notify.call(this, "fakedReadout");
var index = x + this.width * y;
return original.call(this, rng(x, index), rng(y, index));
}
else {
return originalValue;
}
return checkerWrapper(checker, this, arguments, function(args, check){
var {prefs, notify, window, original} = check;
var rng = randomSupply.getValueRng(1, window);
var originalValue = original.apply(this, window.Array.from(args));
if ((typeof originalValue) === "boolean"){
notify.call(this, "fakedReadout");
var index = x + this.width * y;
return original.call(this, rng(x, index), rng(y, index));
}
else {
return originalValue;
}
});
};
}
},
@ -360,27 +378,30 @@
return status;
},
object: "CanvasRenderingContext2D",
fakeGenerator: function(prefs, notify, window, original){
fakeGenerator: function(checker){
return function fillText(str, x, y){
if (!this || canvasSizeShouldBeFaked(this.canvas, prefs)){
notify.call(this, "fakedInput");
var oldImageData;
try {
// "this" is not trustable - it may be not a context
oldImageData = getImageData(window, this).imageData;
return checkerWrapper(checker, this, arguments, function(args, check){
var {prefs, notify, window, original} = check;
if (!this || canvasSizeShouldBeFaked(this.canvas, prefs)){
notify.call(this, "fakedInput");
var oldImageData;
try {
// "this" is not trustable - it may be not a context
oldImageData = getImageData(window, this).imageData;
}
catch (e){
// nothing to do here
}
// if "this" is not a correct context the next line will throw an error
var ret = original.apply(this, window.Array.from(args));
var newImageData = getImageData(window, this).imageData;
this.putImageData(randomMixImageData(window, oldImageData, newImageData), 0, 0);
return ret;
}
catch (e){
// nothing to do here
else {
return original.apply(this, window.Array.from(args));
}
// if "this" is not a correct context the next line will throw an error
var ret = original.apply(this, window.Array.from(arguments));
var newImageData = getImageData(window, this).imageData;
this.putImageData(randomMixImageData(window, oldImageData, newImageData), 0, 0);
return ret;
}
else {
return original.apply(this, window.Array.from(arguments));
}
});
};
}
},
@ -392,27 +413,30 @@
return status;
},
object: "CanvasRenderingContext2D",
fakeGenerator: function(prefs, notify, window, original){
fakeGenerator: function(checker){
return function strokeText(str, x, y){
if (!this || canvasSizeShouldBeFaked(this.canvas, prefs)){
notify.call(this, "fakedInput");
var oldImageData;
try {
// "this" is not trustable - it may be not a context
oldImageData = getImageData(window, this).imageData;
return checkerWrapper(checker, this, arguments, function(args, check){
var {prefs, notify, window, original} = check;
if (!this || canvasSizeShouldBeFaked(this.canvas, prefs)){
notify.call(this, "fakedInput");
var oldImageData;
try {
// "this" is not trustable - it may be not a context
oldImageData = getImageData(window, this).imageData;
}
catch (e){
// nothing to do here
}
// if "this" is not a correct context the next line will throw an error
var ret = original.apply(this, window.Array.from(args));
var newImageData = getImageData(window, this).imageData;
this.putImageData(randomMixImageData(window, oldImageData, newImageData), 0, 0);
return ret;
}
catch (e){
// nothing to do here
else {
return original.apply(this, window.Array.from(args));
}
// if "this" is not a correct context the next line will throw an error
var ret = original.apply(this, window.Array.from(arguments));
var newImageData = getImageData(window, this).imageData;
this.putImageData(randomMixImageData(window, oldImageData, newImageData), 0, 0);
return ret;
}
else {
return original.apply(this, window.Array.from(arguments));
}
});
};
}
},
@ -424,21 +448,24 @@
return status;
},
object: ["WebGLRenderingContext", "WebGL2RenderingContext"],
fakeGenerator: function(prefs, notify, window, original){
fakeGenerator: function(checker){
return function readPixels(x, y, width, height, format, type, pixels){ // eslint-disable-line max-params
if (!this || canvasSizeShouldBeFaked(this.canvas, prefs)){
notify.call(this, "fakedReadout");
var fakeCanvas = getFakeCanvas(window, this.canvas, prefs);
var {context} = copyCanvasToWebgl(
window,
fakeCanvas,
this instanceof window.WebGLRenderingContext? "webgl": "webgl2"
);
return original.apply(context, window.Array.from(arguments));
}
else {
return original.apply(this, window.Array.from(arguments));
}
return checkerWrapper(checker, this, arguments, function(args, check){
var {prefs, notify, window, original} = check;
if (!this || canvasSizeShouldBeFaked(this.canvas, prefs)){
notify.call(this, "fakedReadout");
var fakeCanvas = getFakeCanvas(window, this.canvas, prefs);
var {context} = copyCanvasToWebgl(
window,
fakeCanvas,
this instanceof window.WebGLRenderingContext? "webgl": "webgl2"
);
return original.apply(context, window.Array.from(args));
}
else {
return original.apply(this, window.Array.from(args));
}
});
};
}
}
@ -446,7 +473,17 @@
Object.keys(scope.changedFunctions).forEach(function(key){
scope.changedFunctions[key].api = "canvas";
});
Object.keys(modifiedAudioAPI.changedFunctions).forEach(function(key){
scope.changedFunctions[key] = modifiedAudioAPI.changedFunctions[key];
});
scope.changedGetters = {};
function appendModified(collection){
Object.keys(collection.changedFunctions || {}).forEach(function(key){
scope.changedFunctions[key] = collection.changedFunctions[key];
});
Object.keys(collection.changedGetters || {}).forEach(function(key){
scope.changedGetters[key] = collection.changedGetters[key];
});
}
appendModified(modifiedAudioAPI);
}());