Please take this discussion to this post: https://lemmy.ml/post/28376589

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Selfhosting is always a dilemma in terms of security for a lot of reasons. Nevertheless, I have one simple goal: selfhost a Jellyfin instance in the most secure way possible. I don’t plan to access it anywhere but home.

TL;DR

I want the highest degree of security possible, but my hard limits are:

  • No custom DNS
  • Always-on VPN
  • No self-signed certificates (unless there is no risk of MITM)
  • No external server

Full explanation

I want to be able to access it from multiple devices, so it can’t be a local-only instance.

I have a Raspberry Pi 5 that I want to host it on. That means I will not be hosting it on an external server, and I will only be able to run something light like securecore rather than something heavy like Qubes OS. Eventually I would like to use GrapheneOS to host it, once Android’s virtual machine management app becomes more stable.

It’s still crazy to me that 2TB microSDXC cards are a real thing.

I would like to avoid subscription costs such as the cost of buying a domain or the cost of paying for a VPN, however I prioritize security over cost. It is truly annoying that Jellyfin clients seldom support self-signed certificates, meaning the only way to get proper E2EE is by buying a domain and using a certificate authority. I wouldn’t want to use a self-signed certificate anyways, due to the risk of MITM attacks. I am a penetration tester, so I have tested attacks by injecting malicious certificates before. It is possible to add self-signed certificates as trusted certificates for each system, but I haven’t been able to get that to work since it seems clients don’t trust them anyways.

Buying a domain also runs many privacy risks, since it’s difficult to buy domains without handing over personal information. I do not want to change my DNS, since that risks browser fingerprinting if it differs from the VPN provider. I always use a VPN (currently ProtonVPN) for my devices.

If I pay for ProtonVPN (or other providers) it is possible to allow LAN connections, which would help significantly, but the issue of self-signed certificates still lingers.

With that said, it seems my options are very limited.

  • The 8232 Project@lemmy.mlOPEnglish
    16·
    6 days ago

    You don’t need a VPN for LAN connections.

    ProtonVPN by default blocks LAN connections, and can only be changed using their paid tier.

    • catloaf@lemm.eeEnglish
      16·
      6 days ago

      For that aspect, I would recommend changing to a provider that doesn’t have such ridiculous restrictions.

      • AbidanYre@lemmy.worldEnglish
        4·
        5 days ago

        I kind of get it from Proton’s POV. If they have a free tier that allows a limited number of devices they’ll want to make sure you don’t tunnel all you devices through that one.

      • The 8232 Project@lemmy.mlOPEnglish
        14·
        6 days ago

        The only other providers I would use are Mullvad VPN or IVPN, both of which are paid.

        I agree it is ridiculous.

              • litchralee@sh.itjust.worksEnglish
                3·
                6 days ago

                Not “insecure” in the sense that they’re shoddy with their encryption, no. But being free could possibly mean their incentives are not necessarily aligned with that of the free users.

                In security speak, the CIA triad stands for Confidentiality, Integrity, and Availability. I’m not going to unduly impugn Proton VPN’s credentials on data confidentiality and data integrity, but availability can be a legit security concern.

                For example, if push comes to shove and Proton VPN is hit with a DDoS attack, would free tier users be the first to be disconnected to free up capacity? Alternatively, suppose the price for IP transit shoots through the roof due to weird global economics and ProtonVPN has to throttle the free tier to 10 Mbps. All VPN operators share these possibilities, but however well-meaning Proton VPN and the non-profit behind them are, economic factors can force changes that aren’t great for the free users.

                Now, the obv solution at such a time would be to then switch to being a paid customer. And that might be fine for lots of customers, if that ever comes to pass. But Murphy’s Law makes it a habit that this scenario would play out when users are least able to prepare for it, possibly leading to some amount of unavailability.

                So yes, a holistic analysis of failure points is precisely what proper security calls for. Proton VPN free tier may very well be inappropriate. But whether it rises to a serious concern or just warrants an “FYI”, that will vary based on individual circumstances.