security-and-privacy/CanvasBlocker
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Code Releases Activity

Added test for data URL pages

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For #208.
This commit is contained in:
kkapsner 2018-07-16 00:05:33 +02:00
parent 95f8faed6f
commit 8ca23e37e1
4 changed files with 135 additions and 0 deletions
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7
test/dataUrlTest.js Normal file
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(function(){
"use strict";
document.getElementById("code").textContent = atob(
document.getElementById("iframe").src.replace("data:text/html;base64,", "")
);
}());

22
test/dataUrlTest.php Normal file
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<!DOCTYPE html>
<html>
<head>
<title>data-URL Test</title>
<style>
iframe {
display: block;
box-sizing: border-box;
width: 100%;
height: 7em;
}
</style>
</head>
<body>
<h1>Normal iFrame</h1>
<iframe src="sendFingerprintTest.html"></iframe>
<h1>Data-URL iFrame</h1>
<iframe id="iframe" src="data:text/html;base64,<?php echo base64_encode(file_get_contents("sendFingerprintTest.html"));?>"></iframe>
<h1>iFrame code</h1>
<pre id="code"></pre>
<script src="dataUrlTest.js"></script>
</body></html>

1
test/index.html
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@ -8,6 +8,7 @@
<ul>
<li><a href="test.html">Fingerprinting test</a></li>
<li><a href="dataUrlTest.php">Data-URL test</a></li>
<li><a href="audioTest.html">Audio Fingerprint test</a></li>
<li><a href="detectionTest.html">Detection test</a></li>
<li><a href="performanceTest.html">Performance test</a></li>

105
test/sendFingerprintTest.html Normal file
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<html>
<body>
<div id="log"></div>
<form id="form" method="POST" action="http://localhost/server/POST-echo.php">
<input name="internalId" value="id to be used to link the requests">
<textarea style="display: block;" name="fingerprint"></textarea>
<button>submit</button>
</form>
<script>
function draw(canvas){
"use strict";
canvas.setAttribute("width", 220);
canvas.setAttribute("height", 30);
var fp_text = "BrowserLeaks,com <canvas> 10";
var 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 ctx;
}
function topTest(){
"use strict";
// create window canvas
var canvas = document.createElement("canvas");
// draw image in window canvas
var ctx = draw(canvas);
return {
imageData: ctx.getImageData(0, 0, canvas.width, canvas.height),
url: canvas.toDataURL(),
isPointInPath: getIsPointInPath(ctx)
};
}
function getIsPointInPath(ctx){
"use strict";
ctx.beginPath();
ctx.moveTo(20, 19);
ctx.lineTo(40, 19);
ctx.lineTo(30, 30);
ctx.closePath();
ctx.stroke();
return ctx.isPointInPath(30, 19);
};
function hashToString(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("");
}
function send(form, {url, imageData, isPointInPath}){
var buffer = new TextEncoder("utf-8").encode(url);
Promise.all([
crypto.subtle.digest("SHA-256", buffer),
crypto.subtle.digest("SHA-256", imageData.data)
]).then(function(hashes){
var data = JSON.stringify({
urlHash: hashToString(hashes[0]),
imageDataHash: hashToString(hashes[1]),
isPointInPath
}, null, "\t");
form.fingerprint.value = data;
var xhr = new XMLHttpRequest();
xhr.open("POST", form.action, true);
xhr.onreadystatechange = function(){
if (this.readyState === 4){
const status = this.status;
if (status === 200 || status === 304) {
console.log("Sending xhr successful:", this);
}
else {
console.log("Sending xhr failed:", this);
}
}
};
xhr.send(new FormData(form));
window.setTimeout(function(){
form.submit();
window.setTimeout(function(){
document.getElementById("log").textContent = "You see the real canvas fingerprint, but it cannot leak from this iFrame.";
},
250
);
}, 1000);
});
}
send(document.getElementById("form"), topTest());
</script>
</body>
</html>