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LibWeb: Make MessageEvents from {Window,MessagePort}.postMessage trusted

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The MessagePort one in particular is required by Cloudflare Turnstile,
as the method it takes to run JS in a worker is to `eval` the contents
of `MessageEvent.data`. However, it will only do this if
`MessageEvent.isTrusted` is true, `MessageEvent.origin` is the empty
string and `MessageEvent.source` is `null`.

The Window version is a quick fix whilst in the vicinity, as its
MessageEvent should also be trusted.
This commit is contained in:
Luke Wilde 2024-11-15 17:15:34 +00:00 • committed by Andreas Kling
commit 079c28d5e6
Notes: github-actions[bot] 2024-11-15 17:51:05 +00:00
6 changed files with 64 additions and 1 deletions
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27
Tests/LibWeb/Text/input/HTML/Window-MessageEvents-should-be-trusted.html Normal file
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@ -0,0 +1,27 @@
<!DOCTYPE html>
<script src="../include.js"></script>
<script>
asyncTest((done) => {
const iframe = document.createElement("iframe");
document.body.appendChild(iframe);
const script = iframe.contentDocument.createElement("script");
script.textContent = `
self.onmessage = (messageEvent) => {
if (messageEvent.isTrusted && messageEvent.source === window.parent) {
window.parent.postMessage(messageEvent.data + "pong");
}
};
`;
iframe.contentDocument.body.appendChild(script);
window.onmessage = (messageEvent) => {
if (messageEvent.isTrusted && messageEvent.source === iframe.contentWindow) {
println(messageEvent.data);
done();
}
}
iframe.contentWindow.postMessage("ping\n", { targetOrigin: "*" });
});
</script>