mirror of
https://github.com/kkapsner/CanvasBlocker
synced 2024-12-23 13:20:27 +01:00
614 lines
15 KiB
JavaScript
614 lines
15 KiB
JavaScript
const addTest = (function(){
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"use strict";
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const statusDefinitions = [
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{className: "notRun", text: "not run"},
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{className: "loud", text: "API tampering detected"},
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{className: "stealthy", text: "no API tampering detected"},
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{className: "failed", text: "test failed"}
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];
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const ul = document.getElementById("tests");
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return async function addTest(name, func){
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const li = document.createElement("li");
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const nameNode = document.createElement("span");
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nameNode.className = "name";
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nameNode.textContent = name;
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nameNode.title = func.toString();
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li.appendChild(nameNode);
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li.appendChild(document.createTextNode(": "));
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const statusNode = document.createElement("span");
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statusNode.className = "status";
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li.appendChild(statusNode);
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ul.appendChild(li);
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const logs = [];
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function log(){
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logs.push(Array.prototype.slice.call(arguments).join(" "));
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}
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let status = 0;
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try {
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status = await func(log)? 1: 2;
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}
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catch (error){
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console.log(error);
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status = 3;
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}
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li.className = statusDefinitions[status].className;
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statusNode.textContent = statusDefinitions[status].text;
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statusNode.title = logs.join("\n");
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return li;
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};
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}());
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function checkPropertyDescriptor(object, name, expectedDescriptor, log){
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"use strict";
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const descriptor = Object.getOwnPropertyDescriptor(object, name);
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let detected = false;
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function logProperty(desc, got, expected){
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log("Wrong", desc, "for", name, "- got:", got, "- expected: ", expected);
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}
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function compare(desc, getter){
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const got = getter(descriptor);
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const expected = getter(expectedDescriptor);
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if ((typeof expected) === "function"){
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if (got.name !== expected.name){
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detected = true;
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logProperty(desc + " (function name)", got.name, expected.name);
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}
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if (got.length !== expected.length){
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detected = true;
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logProperty(desc + " (function length)", got.length, expected.length);
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}
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const re = "^\\s*function " + expected.name + "\\s*\\(\\)\\s*\\{\\s*\\[native code\\]\\s*\\}\\s*$";
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if (!got.toString().match(new RegExp(re))){
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detected = true;
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logProperty(desc + " (function string)", got.toString(), re);
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}
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}
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else if (got !== expected){
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logProperty(desc, got, expected);
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detected = true;
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}
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}
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compare("descriptor type", function(v){return typeof v;});
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if (descriptor){
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Object.keys(descriptor).forEach(function(key){
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compare(key, function(v){return v[key];});
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});
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}
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return detected;
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}
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addTest("function length", function(log){
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"use strict";
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if (CanvasRenderingContext2D.prototype.getImageData.length !== 4){
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log("expected 4 parameters for getImageData - got", CanvasRenderingContext2D.prototype.getImageData.length);
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return true;
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}
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else {
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return false;
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}
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});
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async function getIframe(){
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"use strict";
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return new Promise(function(resolve){
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const length = window.length;
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const iframe = document.createElement("iframe");
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iframe.style.display = "none";
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iframe.src = "?";
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document.body.appendChild(iframe);
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iframe.addEventListener("load", function(){
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resolve(window[length]);
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});
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});
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}
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addTest("function code", async function(log){
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"use strict";
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let codeDetected = false;
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const iframe = await getIframe();
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function checkFunctionCode(func, expectedName){
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log("checking", expectedName);
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const reg = new RegExp("^\\s*function " + expectedName + "\\s*\\(\\)\\s*\\{\\s*\\[native code\\]\\s*\\}\\s*$");
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if (!func.toString().match(reg)){
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log("unexpected function code:", func.toString());
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return true;
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}
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const iframeString = iframe.Function.prototype.toString.call(func);
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if (!iframeString.match(reg)){
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log("unexpected function code (iframe):", iframeString);
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return true;
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}
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return false;
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}
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log("canvas functions");
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codeDetected = checkFunctionCode(
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CanvasRenderingContext2D.prototype.getImageData,
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"getImageData"
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) || codeDetected;
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codeDetected = checkFunctionCode(
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HTMLCanvasElement.prototype.toDataURL,
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"toDataURL"
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) || codeDetected;
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log("history getter");
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codeDetected = checkFunctionCode(
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history.__lookupGetter__("length"),
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"(get )?length"
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) || codeDetected;
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log("window getters");
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codeDetected = checkFunctionCode(
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window.__lookupGetter__("name"),
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"(get )?name"
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) || codeDetected;
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codeDetected = checkFunctionCode(
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window.__lookupSetter__("name"),
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"(set )?name"
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) || codeDetected;
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log("navigator getters");
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Object.keys(navigator.__proto__).forEach(function(property){
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if (typeof navigator[property] === "string"){
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codeDetected = checkFunctionCode(
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navigator.__proto__.__lookupGetter__(property),
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"(get )?" + property
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) || codeDetected;
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}
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});
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log("DOMRect getters");
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["x", "y", "height", "width"].forEach(function(property){
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codeDetected = checkFunctionCode(
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DOMRect.prototype.__lookupGetter__(property),
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"(get )?" + property
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) || codeDetected;
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});
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return codeDetected;
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});
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addTest("toString modified", function(log){
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"use strict";
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return checkPropertyDescriptor(
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HTMLCanvasElement.prototype.toDataURL,
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"toString",
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undefined,
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log
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) | checkPropertyDescriptor(
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Object.prototype,
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"toString",
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{
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value: function toString(){},
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writable: true,
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enumerable: false,
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configurable: true
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},
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log
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) | checkPropertyDescriptor(
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Function.prototype,
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"toString",
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{
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value: function toString(){},
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writable: true,
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enumerable: false,
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configurable: true
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},
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log
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);
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});
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addTest("function name", function(log){
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"use strict";
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function checkName({func, expectedName}){
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if (func.name !== expectedName){
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log("unexpected function name: " + func.name + " !== " + expectedName);
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return true;
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}
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else {
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return false;
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}
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}
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return [
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{
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func: HTMLCanvasElement.prototype.toDataURL,
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expectedName: "toDataURL"
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},
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{
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func: CanvasRenderingContext2D.prototype.getImageData,
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expectedName: "getImageData"
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},
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{
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func: history.__lookupGetter__("length"),
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expectedName: "get length"
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},
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{
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func: window.__lookupGetter__("name"),
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expectedName: "get name"
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},
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{
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func: window.__lookupSetter__("name"),
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expectedName: "set name"
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},
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{
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func: HTMLIFrameElement.prototype.__lookupGetter__("contentDocument"),
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expectedName: "get contentDocument"
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},
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{
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func: HTMLIFrameElement.prototype.__lookupGetter__("contentWindow"),
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expectedName: "get contentWindow"
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},
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].map(checkName).some(function(b){return b;});
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});
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addTest("exposed getters or setters", function(log){
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"use strict";
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return Object.keys(window).filter(function(key){
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if (/^(get|set) /.test(key)){
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log("found exposed function", JSON.stringify(key));
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return true;
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}
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return false;
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}).length !== 0;
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});
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addTest("property descriptor", function(log){
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"use strict";
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const properties = [
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{
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object: CanvasRenderingContext2D.prototype,
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name: "getImageData",
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descriptor: {
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value: function getImageData(x, y, w, h){},
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writable: true,
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enumerable: true,
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configurable: true
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}
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},
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{
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object: HTMLCanvasElement.prototype,
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name: "toDataURL",
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descriptor: {
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value: function toDataURL(){},
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writable: true,
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enumerable: true,
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configurable: true
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}
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},
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{
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object: Element.prototype,
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name: "getClientRects",
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descriptor: {
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value: function getClientRects(){},
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writable: true,
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enumerable: true,
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configurable: true
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}
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},
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];
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return properties.reduce(function(pass, property){
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return checkPropertyDescriptor(property.object, property.name, property.descriptor, log) || pass;
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}, false);
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});
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addTest("error provocation 1", function(log){
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"use strict";
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const canvas = document.createElement("canvas");
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const ctx = canvas.getContext("2d");
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let canvasBlocker = false;
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try{
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ctx.getImageData(0, 0, 0, 0);
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}
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catch (error){
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try {
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log(error.name);
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log(error.toString());
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}
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catch (error){
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canvasBlocker = true;
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}
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}
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return canvasBlocker;
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});
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addTest("error provocation 2", function(log){
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"use strict";
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const canvas = document.createElement("canvas");
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canvas.width = 0;
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const ctx = canvas.getContext("2d");
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let canvasBlocker = false;
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try{
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ctx.getImageData(0, 0, 1, 1);
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log("no error provoked");
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}
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catch (error){
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try {
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log(error.name);
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log(error.toString());
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}
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catch (error){
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canvasBlocker = true;
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}
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}
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return canvasBlocker;
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});
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addTest("error provocation 3", function(log){
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"use strict";
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let canvasBlocker = false;
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try{
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CanvasRenderingContext2D.prototype.getImageData.apply(undefined, [0, 0, 1, 1]);
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}
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catch (error){
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try {
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log(error.name);
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log(error.toString());
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}
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catch (error){
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canvasBlocker = true;
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}
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}
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return canvasBlocker;
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});
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addTest("error properties", function(log){
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"use strict";
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let canvasBlocker = false;
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try{
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CanvasRenderingContext2D.prototype.getImageData.apply(undefined, [0, 0, 1, 1]);
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}
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catch (error){
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try {
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const name = "TypeError";
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if (error.name !== name && error instanceof TypeError){
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log("Error name wrong. Expected: ", name, "- got:", error.name);
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canvasBlocker = true;
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}
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const start = "@" + location.href.replace(/\.html$/, ".js");
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if (!error.stack.startsWith(start)){
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log("Error stack starts wrong. Expected:", start, "- got :", error.stack.split(/\n/g, 2)[0]);
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canvasBlocker = true;
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}
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const message = "'getImageData' called on an object that " +
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"does not implement interface CanvasRenderingContext2D.";
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if (error.message !== message){
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log("Error message wrong. Expected: ", message, "- got:", error.message);
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canvasBlocker = true;
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}
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}
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catch (error){
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canvasBlocker = true;
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}
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}
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return canvasBlocker;
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});
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function testKnownPixelValue(size, log){
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"use strict";
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const canvas = document.createElement("canvas");
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canvas.height = size;
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canvas.width = size;
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const context = canvas.getContext("2d");
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const imageData = new ImageData(canvas.width, canvas.height);
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const pixelValues = imageData.data;
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for (let i = 0; i < imageData.data.length; i += 1){
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if (i % 4 !== 3){
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pixelValues[i] = Math.floor(256 * Math.random());
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}
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else {
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pixelValues[i] = 255;
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}
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}
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context.putImageData(imageData, 0, 0);
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const p = context.getImageData(0, 0, canvas.width, canvas.height).data;
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for (let i = 0; i < p.length; i += 1){
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if (p[i] !== pixelValues[i]){
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log("wrong value", p[i], "at", i, "expected", pixelValues[i]);
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return true;
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}
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}
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return false;
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}
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addTest("known pixel value test 1", function(log){
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"use strict";
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return testKnownPixelValue(1, log);
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});
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addTest("known pixel value test 10", function(log){
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"use strict";
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return testKnownPixelValue(10, log);
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});
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addTest("double readout test", function(log){
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"use strict";
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const canvas = document.createElement("canvas");
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const context = canvas.getContext("2d");
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const imageData = context.getImageData(0, 0, canvas.width, canvas.height);
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for (let i = 0; i < imageData.data.length; i += 1){
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if (i % 4 !== 3){
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imageData.data[i] = Math.floor(256 * Math.random());
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}
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else {
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imageData.data[i] = 255;
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}
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}
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context.putImageData(imageData, 0, 0);
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const imageData1 = context.getImageData(0, 0, canvas.width, canvas.height);
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const imageData2 = context.getImageData(0, 0, canvas.width, canvas.height);
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for (let i = 0; i < imageData2.data.length; i += 1){
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if (imageData1.data[i] !== imageData2.data[i]){
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log("mismatch at", i, ":",
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imageData1.data[i], "(", imageData1.data[i].toString(2), ")",
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"!=",
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imageData2.data[i], "(", imageData2.data[i].toString(2), ")",
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"| original:", imageData.data[i], "(", imageData.data[i].toString(2), ")"
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);
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return true;
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}
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}
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return false;
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});
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addTest("double readout test (toDataURL)", function(log){
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"use strict";
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const canvas = document.createElement("canvas");
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const context = canvas.getContext("2d");
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const imageData = context.getImageData(0, 0, canvas.width, canvas.height);
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for (let i = 0; i < imageData.data.length; i += 1){
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if (i % 4 !== 3){
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imageData.data[i] = Math.floor(256 * Math.random());
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}
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else {
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imageData.data[i] = 255;
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}
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}
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context.putImageData(imageData, 0, 0);
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const dataURL1 = canvas.toDataURL();
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const dataURL2 = canvas.toDataURL();
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if (dataURL1 !== dataURL2){
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log("data URL missmatch:",
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dataURL1,
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"!=",
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dataURL2
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);
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return true;
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}
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return false;
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});
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addTest("readout - in - out test", function(log){
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"use strict";
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const canvas = document.createElement("canvas");
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const context = canvas.getContext("2d");
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const imageData = context.getImageData(0, 0, canvas.width, canvas.height);
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for (let i = 0; i < imageData.data.length; i += 1){
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if (i % 4 !== 3){
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imageData.data[i] = Math.floor(256 * Math.random());
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}
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else {
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imageData.data[i] = 255;
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}
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}
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context.putImageData(imageData, 0, 0);
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const imageData1 = context.getImageData(0, 0, canvas.width, canvas.height);
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const canvas2 = document.createElement("canvas");
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const context2 = canvas2.getContext("2d");
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context2.putImageData(imageData1, 0, 0);
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const imageData2 = context2.getImageData(0, 0, canvas.width, canvas.height);
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for (let i = 0; i < imageData2.data.length; i += 1){
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if (imageData1.data[i] !== imageData2.data[i]){
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log("mismatch at", i, ":",
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imageData1.data[i], "(", imageData1.data[i].toString(2), ")",
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"!=",
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imageData2.data[i], "(", imageData2.data[i].toString(2), ")"
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);
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return true;
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}
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}
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return false;
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});
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addTest("window name change", function(log){
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"use strict";
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const oldName = window.name;
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log("old name:", oldName);
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const newName = oldName + " added";
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log("new name:", newName);
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window.name = newName;
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if (window.name !== newName){
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log("window name not set:", window.name);
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return true;
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}
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return false;
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});
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function checkDOMRectData(rect, data, log){
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"use strict";
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let detected = false;
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["x", "y", "width", "height"].forEach(function(property){
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if (data[property] !== rect[property]){
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log("Wrong value for", property, ":", data[property], "!=", rect[property]);
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detected = true;
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}
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});
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return detected;
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}
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function getRectByData(data){
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"use strict";
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const el = document.createElement("div");
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el.style.cssText = "position: fixed;" +
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"left: " + data.x + "px; " +
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"top: " + data.y + "px; " +
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"width: " + data.width + "px; " +
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"height: " + data.height + "px;";
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document.body.appendChild(el);
|
|
const rect = el.getBoundingClientRect();
|
|
document.body.removeChild(el);
|
|
return rect;
|
|
}
|
|
|
|
addTest("self created DOMRect", function(log){
|
|
"use strict";
|
|
|
|
const data = {
|
|
x: Math.PI,
|
|
y: Math.E,
|
|
width: Math.LOG10E,
|
|
height: Math.LOG2E
|
|
};
|
|
const rect = new DOMRect(data.x, data.y, data.width, data.height);
|
|
return checkDOMRectData(rect, data, log);
|
|
});
|
|
|
|
addTest("known DOMRect", function(log){
|
|
"use strict";
|
|
|
|
const data = {
|
|
x: 1 + 1/4,
|
|
y: 2,
|
|
width: 3,
|
|
height: 4
|
|
};
|
|
|
|
const rect = getRectByData(data);
|
|
|
|
return checkDOMRectData(rect, data, log);
|
|
});
|
|
addTest("changed DOMRect", function(log){
|
|
"use strict";
|
|
|
|
const data = {
|
|
x: Math.PI,
|
|
y: 2,
|
|
width: 3,
|
|
height: 4
|
|
};
|
|
|
|
const rect = getRectByData(data);
|
|
rect.x = Math.PI;
|
|
|
|
return checkDOMRectData(rect, data, log);
|
|
});
|
|
addTest("recreated DOMRect", function(log){
|
|
"use strict";
|
|
|
|
const data = {
|
|
x: Math.PI,
|
|
y: Math.E,
|
|
width: Math.LOG10E,
|
|
height: Math.LOG2E
|
|
};
|
|
|
|
const rect = getRectByData(data);
|
|
const rect2 = getRectByData(rect);
|
|
|
|
return checkDOMRectData(rect2, rect, log);
|
|
}); |