security-and-privacy/CanvasBlocker
security-and-privacy/CanvasBlocker
1
0
Fork 0
mirror of https://github.com/kkapsner/CanvasBlocker synced 2025-07-04 04:26:35 +02:00
Code Releases Activity

test updates

Browse source
This commit is contained in:
kkapsner 2019-12-16 19:27:28 +01:00
parent 717e1d3e3a
commit 0d0e3e30ec
16 changed files with 455 additions and 497 deletions
Download patch file Download diff file Expand all files Collapse all files

65
test/settingsLoading.php
View file

@ -6,16 +6,16 @@
<link href="testIcon.svg" type="image/png" rel="icon">
<link href="testIcon.svg" type="image/png" rel="shortcut icon">
<script>
var firstDescriptor = Object.getOwnPropertyDescriptor(HTMLCanvasElement.prototype, "getContext");
const firstDescriptor = Object.getOwnPropertyDescriptor(HTMLCanvasElement.prototype, "getContext");
console.log(new Date(), "starting first fingerprint", window.name);
function fingerPrint(){
"use strict";var canvas = document.createElement("canvas");
"use strict";const canvas = document.createElement("canvas");
canvas.setAttribute("width", 220);
canvas.setAttribute("height", 30);
var fp_text = "BrowserLeaks,com <canvas> 10";
const fp_text = "BrowserLeaks,com <canvas> 10";
var ctx = canvas.getContext("2d");
const ctx = canvas.getContext("2d");
ctx.textBaseline = "top";
ctx.font = "14px 'Arial'";
ctx.textBaseline = "alphabetic";
@ -28,21 +28,20 @@
return canvas.toDataURL();
}
function hash(url){
async function hash(url){
"use strict";
var buffer = new TextEncoder("utf-8").encode(url);
return crypto.subtle.digest("SHA-256", buffer).then(function(hash){
var 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("");
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("");
}
var firstFingerprint = false;
let firstFingerprint = false;
try {
firstFingerprint = fingerPrint();
}
@ -76,14 +75,14 @@
<div id="output"></div>
<script>
if (firstFingerprint){
var output = document.getElementById("output");
const output = document.getElementById("output");
output.textContent = "context API not blocked";
output.appendChild(document.createElement("br"));
window.setTimeout(function(){
window.setTimeout(async function(){
"use strict";
console.log(new Date(), "starting second fingerprint", window.name);
var secondDescriptor = Object.getOwnPropertyDescriptor(HTMLCanvasElement.prototype, "getContext");
const secondDescriptor = Object.getOwnPropertyDescriptor(HTMLCanvasElement.prototype, "getContext");
if (firstDescriptor.value === secondDescriptor.value){
output.appendChild(document.createTextNode("descriptor did not change -> good!"));
@ -95,26 +94,22 @@
output.classList.add("nok");
}
output.appendChild(document.createElement("br"));
var secondFingerprint = fingerPrint();
const secondFingerprint = fingerPrint();
if (firstFingerprint === secondFingerprint){
return hash(firstFingerprint).then(function(hash){
output.appendChild(document.createTextNode("fingerprint consistent (" + hash + ") -> good!"));
output.classList.add("ok");
return;
});
const firstHash = await hash(firstFingerprint);
output.appendChild(document.createTextNode("fingerprint consistent (" + firstHash + ") -> good!"));
output.classList.add("ok");
}
else {
return Promise.all([hash(firstFingerprint), hash(secondFingerprint)]).then(function(hashes){
output.appendChild(
document.createTextNode(
"fingerprint not consistent (" +
hashes[0] + " != " + hashes[1] +
") -> very bad! (potential fingerprint leak)"
)
);
output.classList.add("nok");
return;
});
const hashes = await Promise.all([hash(firstFingerprint), hash(secondFingerprint)]);
output.appendChild(
document.createTextNode(
"fingerprint not consistent (" +
hashes[0] + " != " + hashes[1] +
") -> very bad! (potential fingerprint leak)"
)
);
output.classList.add("nok");
}
}, 500);
}