security-and-privacy/CanvasBlocker
security-and-privacy/CanvasBlocker
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Added testAPI and canvasAPI

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This commit is contained in:
kkapsner 2020-01-06 15:15:04 +01:00
parent 4337ccbf33
commit e50e9deca4
10 changed files with 177 additions and 256 deletions
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45
test/settingsLoading.php
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@ -5,45 +5,16 @@
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<link href="testIcon.svg" type="image/png" rel="icon">
<link href="testIcon.svg" type="image/png" rel="shortcut icon">
<?php
echo "<script>" . file_get_contents("testAPI.js");
echo file_get_contents("canvasAPI.js") . "</script>";
?>
<script>
const firstDescriptor = Object.getOwnPropertyDescriptor(HTMLCanvasElement.prototype, "getContext");
console.log(new Date(), "starting first fingerprint", window.name);
function fingerPrint(){
"use strict";const canvas = document.createElement("canvas");
canvas.setAttribute("width", 220);
canvas.setAttribute("height", 30);
const fp_text = "BrowserLeaks,com <canvas> 10";
const ctx = canvas.getContext("2d");
ctx.textBaseline = "top";
ctx.font = "14px 'Arial'";
ctx.textBaseline = "alphabetic";
ctx.fillStyle = "#f60";
ctx.fillRect(125, 1, 62, 20);
ctx.fillStyle = "#069";
ctx.fillText(fp_text, 2, 15);
ctx.fillStyle = "rgba(102, 204, 0, 07)";
ctx.fillText(fp_text, 4, 17);
return canvas.toDataURL();
}
async function hash(url){
"use strict";
const buffer = new TextEncoder("utf-8").encode(url);
const hash = await crypto.subtle.digest("SHA-256", buffer);
const chunks = [];
(new Uint32Array(hash)).forEach(function(num){
chunks.push(num.toString(16));
});
return chunks.map(function(chunk){
return "0".repeat(8 - chunk.length) + chunk;
}).join("");
}
let firstFingerprint = false;
try {
firstFingerprint = fingerPrint();
firstFingerprint = canvasAPI.fingerprint().url;
}
catch (error){
console.log(new Date(), error);
@ -94,14 +65,14 @@
output.classList.add("nok");
}
output.appendChild(document.createElement("br"));
const secondFingerprint = fingerPrint();
const secondFingerprint = canvasAPI.fingerprint().url;
if (firstFingerprint === secondFingerprint){
const firstHash = await hash(firstFingerprint);
const firstHash = await testAPI.hash(firstFingerprint);
output.appendChild(document.createTextNode("fingerprint consistent (" + firstHash + ") -> good!"));
output.classList.add("ok");
}
else {
const hashes = await Promise.all([hash(firstFingerprint), hash(secondFingerprint)]);
const hashes = await Promise.all([testAPI.hash(firstFingerprint), testAPI.hash(secondFingerprint)]);
output.appendChild(
document.createTextNode(
"fingerprint not consistent (" +