security-and-privacy/CanvasBlocker
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CanvasBlocker
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Refined detection test.

This commit is contained in:
kkapsner 2018-07-16 00:21:56 +02:00
parent 63eedcbdb4
commit 388736d169
1 changed files with 108 additions and 42 deletions
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150
test/detectionTest.js
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@ -36,9 +36,52 @@ var addTest = (function(){
statusNode.title = logs.join("\n");
li.appendChild(statusNode);
ul.appendChild(li);
return li;
};
}());
function checkPropertyDescriptor(object, name, expectedDescriptor, log){
"use strict";
var descriptor = Object.getOwnPropertyDescriptor(object, name);
var detected = false;
function logProperty(desc, got, expected){
log("Wrong", desc, "for", name, "- got:", got, "- expected: ", expected);
}
function compare(desc, getter){
var got = getter(descriptor);
var expected = getter(expectedDescriptor);
if ((typeof expected) === "function"){
if (got.name !== expected.name){
detected = true;
logProperty(desc + " (function name)", expected.name, got.name);
}
if (got.length !== expected.length){
detected = true;
logProperty(desc + " (function length)", expected.length, got.length);
}
const re = "^\\s*function " + expected.name + "\\s*\\(\\)\\s*\\{\\s*\\[native code\\]\\s*\\}\\s*$";
if (!got.toString().match(new RegExp(re))){
detected = true;
logProperty(desc + " (function string)", re, got.toString());
}
}
else if (got !== expected){
logProperty(desc, got, expected);
detected = true;
}
}
compare("descriptor type", function(v){return typeof v;});
if (descriptor){
Object.keys(descriptor).forEach(function(key){
compare(key, function(v){return v[key];});
});
}
return detected;
}
addTest("function length", function(log){
"use strict";
@ -52,21 +95,49 @@ addTest("function length", function(log){
});
addTest("function code", function(log){
"use strict";
if (!CanvasRenderingContext2D.prototype.getImageData.toString().match(
/^\s*function getImageData\s*\(\)\s*\{\s*\[native code\]\s*\}\s*$/
)){
var codeDetected = false;
if (
!CanvasRenderingContext2D.prototype.getImageData.toString().match(
/^\s*function getImageData\s*\(\)\s*\{\s*\[native code\]\s*\}\s*$/
)
){
log("unexpected function code:", CanvasRenderingContext2D.prototype.getImageData.toString());
return true;
codeDetected = true;
}
else {
return false;
if (
!HTMLCanvasElement.prototype.toDataURL.toString().match(
/^\s*function toDataURL\s*\(\)\s*\{\s*\[native code\]\s*\}\s*$/
)
){
log("unexpected function code:", HTMLCanvasElement.prototype.toDataURL.toString());
codeDetected = true;
}
return codeDetected;
});
addTest("toString modified", function(log){
"use strict";
return checkPropertyDescriptor(
HTMLCanvasElement.prototype.toDataURL,
"toString",
undefined,
log
) | checkPropertyDescriptor(
Object.prototype,
"toString",
{
value: function toString(){},
writable: true,
enumerable: false,
configurable: true
},
log
);
});
addTest("function name", function(){
"use strict";
return CanvasRenderingContext2D.prototype.getImageData.name !== "getImageData";
return HTMLCanvasElement.prototype.toDataURL.name !== "toDataURL" ||
CanvasRenderingContext2D.prototype.getImageData.name !== "getImageData";
});
addTest("property descriptor", function(log){
"use strict";
@ -95,40 +166,7 @@ addTest("property descriptor", function(log){
];
return properties.reduce(function(pass, property){
const desiredDescriptor = property.descriptor;
const descriptor = Object.getOwnPropertyDescriptor(property.object, property.name);
return Object.keys(desiredDescriptor).reduce(function(pass, key){
function keyLog(type, expected, got){
log(property.name + ": wrong " + type + " for ", key, "- expected:", expected, "- got:", got);
}
var desiredValue = desiredDescriptor[key];
var value = descriptor[key];
var keyPass = false;
if ((typeof desiredValue) === (typeof value)){
if ((typeof desiredValue) === "function"){
if (value.name !== desiredValue.name){
keyPass = true;
keyLog("function name", desiredValue.name, value.name);
}
if (value.length !== desiredValue.length){
keyPass = true;
keyLog("function length", desiredValue.length, value.length);
}
}
else {
if (desiredValue !== value){
keyPass = true;
keyLog("value", desiredValue, value);
}
}
}
else {
keyPass = true;
keyLog("type", typeof desiredValue, typeof value);
}
return pass || keyPass;
}, false) || pass;
return checkPropertyDescriptor(property.object, property.name, property.descriptor, log) || pass;
}, false);
});
addTest("error provocation 1", function(log){
@ -291,6 +329,34 @@ addTest("double readout test", function(log){
}
return false;
});
addTest("double readout test (toDataURL)", function(log){
"use strict";
var canvas = document.createElement("canvas");
var context = canvas.getContext("2d");
var imageData = context.getImageData(0, 0, canvas.width, canvas.height);
for (let i = 0; i < imageData.data.length; i += 1){
if (i % 4 !== 3){
imageData.data[i] = Math.floor(256 * Math.random());
}
else {
imageData.data[i] = 255;
}
}
context.putImageData(imageData, 0, 0);
var dataURL1 = canvas.toDataURL();
var dataURL2 = canvas.toDataURL();
if (dataURL1 !== dataURL2){
log("data URL missmatch:",
dataURL1,
"!=",
dataURL2
);
return true;
}
return false;
});
addTest("readout - in - out test", function(log){
"use strict";