mic159

Just remember that authentication and origin checking is completely up to the websocket server. Any random page in a browser can talk to your websocket cross origin, and it's up to your server to check the "Origin" header to make sure it's actually your app on the other end.

Why do you need a reverse proxy? The DNS challenge works without https.

Yes you can. You control the DNS, just point that subdomain to 127.0.0.1.

What's wrong with Lets Encrypt and DNS challenge? Then you get a globally recognised cert.

The websocket server needs to check the "Origin" header from the client. The code then needs to know what is expected (eg localhost or 127.0.0.q). If the origin header is something like "evil.xyz.com", then it needs to reject the connection.

Does it have any protection from malicious js on another site (say a bad ad on a news site) connecting to your application?

I have seen some applications like this, but they fail to check the origin header.

With websockets, it's actually up to the server to implement the cross origin detection. The library used in this application does not implement any protection.

So it's possible for any page on the net (eg evil.com) to connect to your socket and exfiltrate any data.

Make sure all tabs are closed and never visit any sites with advertising on it while this is running.

The numlock and capslock indicators can be used as confirmation signals coming back so it knows if it is working.

We are also having issues resolving some .io domains from AWS Sydney (ap-southeast-2)

But if you host your site on your infrastructure, and it goes down, you can't post status updates to tell people what's going on/ when you will be back online. Its quite reasonable to not host your own homepage or mechanism of updating your customers IMO.

If I understand correctly, there is a key in the DHT that is effectively a list of pointers to all your mail? If so, an attacker could control your inbox by starting a bunch of nodes around that key, couldn't they?

To disable a persons mail, you would start up some altered nodes around the address space you want to attack, have them respond normally until you control enough or all of the nodes covering the target address. Then flip a switch that makes them all start saying that inbox is empty. Then start backing off your nodes, and replacement regular nodes would replicate your altered state.

Would this be possible? Or am I missing something?

When I send a message to a room, the others see it as "undefined".