Not sure if this is what @[email protected] was referring to, but I found free-games-claimer from a quick search which seems similar and has a container image at ghcr.io/vogler/free-games-claimer.

If you know your VPN’s DNS server, you can change your local DNS so that it redirects your specified domains/subdomains to the appropriate, local IP address and all other requests would then use your VPN’s DNS.

If you don’t know your VPN provider’s DNS server information, you may be able to still do something similar to the above depending on your setup. Otherwise, you could run your own DNS resolver or use a different DNS provider. I guess doing so could potentially be used to further fingerprint you, but the concern about “DNS fingerprinting” is moreso DNS leaks where your DNS queries are accessible to unintended parties due to improper configuration.

I believe the only other option would be to change your hosts file on each device you want to use to connect to your services, which is probably not the best approach and may be challenging/impossible for certain devices.

Also, unless you setup the self signed certs to be trusted on a network/domain level (or again on each individual device), you will likely get a warning/error about the self signed certs when accessing your services. You may need to work through this process each time the certs renew.

I recommend buying a domain if you do not already have one and finding a service that provides wildcard certification challenges. This would allow you to setup a valid, trusted certificate that you could reuse for all of your services. The only thing that you would need to provide is an email address (can be any email address) and your domain name (in addition to other information that may be required to setup an account at the cert provider, but you may already have an account there as it could be the domain name registrar or other services like VPS providers, Cloudflare, etc.). Since it is a wildcard cert, each subdomain does not need to be set publicly and if you only use the domain within your network, the domain does not need to be publicly associated with any IP address.

If you do go forward with that approach, you could use the wildcard cert directly within NginxProxyManager or other reverse proxies. They will also automatically update/maintain the cert for you.

In terms of privacy, you are giving your identity provider insight to each of the third party services that you use. It may seem that there isn’t too much of a difference between using Google’s SSO vs using your Gmail address to register your third party account. However, one big distinction is that Google would be able to see often and when you use each of your third party services.

Also, it may be impossible to restrict the sharing of certain information from your identity provider with the third party service. For example, maybe you don’t want to share a picture of yourself with a service, but that service uses user profile pictures or avatars. That service may ask (and require) that you give it access to your Google account’s profile picture in order to authenticate using Google’s SSO. You may be able to overwrite that picture, but you also may not be able to revoke the service’s ability to retrieve it. If you used a “regular” local account, that Google profile picture would never be shared with the third party service if you did not upload it directly. The same is true for other information like email, first/last/full name, birthday, etc.

There are other security and operational concerns with using SSO options. With the variety of password managers available, introduction of passkeys, and increased adoption of multi-factor authentication, many of the security benefits associated with SSO aren’t as prevalent as they were 10 years ago. The biggest benefit is likely the convenience that SSO still brings compared to other authentication methods.

Ultimately it’s up to you to determine if these concerns are worth the benefits of using SSO (or the third party service provider at all if they require SSO). I have a feeling the common advise will be to avoid SSO unless its an identity provider that you trust (or even better - one that you host yourself) - especially if you’re using unique emails/usernames along with strong and unique passwords with multi-factor authentication and/or passkeys.