We are also changing how remote playback works for streaming personal media (that is, playback when not on the same local network as the server). The reality is that we need more resources to continue putting forth the best personal media experience, and as a result, we will no longer offer remote playback as a free feature. This—alongside the new Plex Pass pricing—will help provide those resources. This change will apply to the future release of our new Plex experience for mobile and other platforms.
My interpretation of your linked instruction (granted, I haven’t tried plex) is that it’s the same two scenarios.
Your plex client app login talks directly to your server login. The client app meeting the server is arranged by the plex relay server and nothing more. There is no ‘logging in’ to the plex relay server; it’s function is to arrange a meeting of two tunnels and that’s it, much like a tailscale derp server.
The relay server is serving the same function as caddy on a VPS, hell, they could even be using tailscale under the hood and it’d look exactly the same to a user.
Anyway, attack vectors even with a public facing jellyfin are mitigated because
a) jellyfin is running in a docker container = a successful attacker would only be able to trash my jellyfin container, which ultimately is not that big of a deal (unless there is a different docker exploit that enables access to the server itself, which is an entirely different issue and larger than a jellyfin/plex discussion)
b) fail2ban in conjunction with a reverse proxy bans malicious ip addresses that come back with too many errors too many times (errors that you, the admin, specify) So, for example, brute force login attacks are mitigated.
c) the reverse proxy itself allows access to only one specified internal ip address/port combination. Pending a caddy exploit (again, a different discussion) it is not possible to fish for acrive ip addresses or port scan my internal network.
First of all I agree with most of your a, b and c points, just would like to point out that while it’s true that Docker containers provide an extra level of security they’re not as closed down as people sometimes believe, but as a general rule I agree with everything you said.
But you’re wrong about the way Plex works, this is a quote from their documentation:
If that’s not clear enough:
So it’s very clear data is streaming through their relay server, which goes back to my original point of I expect that to be a paid feature, it’s using bandwidth from their relay servers.
As for the security again you’re wrong, authentication happens on the Plex remote server, not on your local one, which is why you can’t use Plex without internet (part of my dislike for them). So you connect to Plex remote server and authenticate there, you then get a client that’s talking to the remote server, even if someone was able to bypass that login they would be inside a Plex owned server, not yours, they would need to then exploit whatever API exists between your home server and that one to jump to your machine, so it’s an extra jump needed, again similarly to having Authelia/Authentik in front of Jellyfin.
Okay. I finally understand what you mean 🥲
Authenticate a self hosted software stack in someone else’s cloud 😂
That is a wild design choice. Glad it works for some…
Anyway… apologies for being ignorant
No need to apologize, it’s a weird choice from Plex, I would have never guessed that this is how it works if I hadn’t suffered outages myself, and I’m amazed that not many people call them out on this, it seems completely against what most self-hosting people are looking for, but they seem to defend Plex with teeth and nails.