Selfhosted
A place to share alternatives to popular online services that can be self-hosted without giving up privacy or locking you into a service you don't control.
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I always see guys swearing by Wireguard for VPN access as a security measure and seems to me like if someone unauthorized gets your public key, they have access to the kingdom.
It's your private key, but yes, you would need to keep it secret just like you would an SSH key.
The benefits of a VPN are that you don't need to open ports up to the internet and rely on your individual services to be secure. Your VPN would authenticate users and ensure that the communication over the tunnel is encrypted (useful if you don't want to set up SSL/https). They can also hide what services you are hosting or even hide the fact that you are even running a VPN.
Private keys are going to be far more secure than passwords since you really can't brute force them in the same way you can passwords. Getting ahold of someone's private key is probably going to be far more difficult than guessing their password. Even if an attacker were to get ahold of your private key, they would still need to contend with the security of your service, e.g. logging into it, which would be no worse than not having a VPN.
You don't get any network isolation with this approach vs a service running in its own dedicated virtual network. Just for this reason, I think Wireguard as a VPN access to other local services is insecure.
Just because your using a VPN doesn't mean you can't isolate hosts to a separate network. I keep my services in a different VLAN and I can route/firewall traffic between that network and anywhere else as I please.