security-and-privacy/CanvasBlocker
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CanvasBlocker
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detectionTest: check function code also in an iFrame

This commit is contained in:
kkapsner 2021-02-21 11:02:43 +01:00
parent a7d02efd09
commit 0930928df3
1 changed files with 22 additions and 4 deletions
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26
test/detectionTest.js
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@ -92,17 +92,35 @@ addTest("function length", function(log){
return false;
}
});
addTest("function code", function(log){
async function getIframe(){
"use strict";
return new Promise(function(resolve){
const length = window.length;
const iframe = document.createElement("iframe");
iframe.style.display = "none";
iframe.src = "?";
document.body.appendChild(iframe);
iframe.addEventListener("load", function(){
resolve(window[length]);
});
});
}
addTest("function code", async function(log){
"use strict";
let codeDetected = false;
const iframe = await getIframe();
function checkFunctionCode(func, expectedName){
log("checking", expectedName);
if (!func.toString().match(
new RegExp("^\\s*function " + expectedName + "\\s*\\(\\)\\s*\\{\\s*\\[native code\\]\\s*\\}\\s*$")
)){
const reg = new RegExp("^\\s*function " + expectedName + "\\s*\\(\\)\\s*\\{\\s*\\[native code\\]\\s*\\}\\s*$");
if (!func.toString().match(reg)){
log("unexpected function code:", func.toString());
return true;
}
const iframeString = iframe.Function.prototype.toString.call(func);
if (!iframeString.match(reg)){
log("unexpected function code (iframe):", iframeString);
return true;
}
return false;
}
log("canvas functions");