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Interesting OSS project: Holesail creates instant P2P tunnels between networks (like a VPN) (holesail.io)

submitted 6 days ago by [email protected] to c/[email protected]

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"Create P2P tunnels instantly that bypass any network, firewall, NAT restrictions and expose your local network to the internet securely, no Dynamic DNS required."

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[-] [email protected] 5 points 6 days ago

This VPN protocol usually uses a private key (client) / public key (server) combo that is used to connect through a public IP address (the 2 nodes can’t communicate it without) using the specified TCP or UDP (more often lately) and port to create the VPN tunnel that’s gets established during the handshakes.

There is a whole lot more going on with the process but that’s a high level view. But I have a WireGuard VPN service running on a raspberry pi that I put in a DMZ on my perimeter firewall.

But a port scanner would be able to see that port is open. Make sure you keep your software up to date. Hopefully the software devs of the VPN application is keeping their stuff up to date to avoid any vulnerabilities getting exposed in the code and a backdoor getting created because of it. As long as that doesn’t become an issue, no one will be able to get through without the private key. And those are usually uncrackable in a lifetime with the complexity and length of the key.

[-] [email protected] 2 points 6 days ago

Open UDP ports are pretty secure and rarely found by scanners. The basic issue with scanning for UDP is, that most services don't respond to random garbage you try to probe then with. Without getting a response back, the scanner has no way of knowing if there is something running on that port or not.
Wireguard in particular only responds if the correct key is given.
Also make sure your firewall DROPs (usually the default, but do check) disallowed connections instead of REJECT. This way any UDP probing, whether it's to an open port or closed one just times out with no way for the scanner to distinguish them.

this post was submitted on 24 Jun 2024

102 points (94.0% liked)

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