So I’m hosting a lot of Docker containers, a lot of which are behind a Traefik reverse proxy. Is it safe to use IPWhitelist middleware? I want to ensure that only the LAN can access the services while using HTTPS, because some services (like Radarr and Sonarr) have a password and I don’t want that information sent without encryption / SSL.
Could someone spoof their client IP address and bypass the Traefik IP whitelist?
As an alternative, have you considered putting those services behind a vpn like tailscale/wire guard/head scale?
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Thank you for your comment.
What do you mean with the http layer? I’m already automatically redirecting from HTTP to HTTPS.
Meaning layer 7 in OSI model https://en.m.wikipedia.org/wiki/OSI_model
Something to keep in mind here. I am also using an IP white-list, but only on some services Traefik hosts.
So for example bitwarden is behind an IP white-list, but subsonic is reachable from any IP.
I think in that case it’s not really possible (or doable) to write L2 firewall routes.
But if you want all traffic to port 80 on your server to be IP whitelisted, then a regular firewall would be good.
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I agree for serious/business applications. In my case, it’s a home server that I and some close friends and family access. But it is indeed exposed (basically, my router routes port 80 and 443 to the server within the NAT).
To discuss the header-based firewall: the host is used by Traefik to determine which docker container to route (reverse proxy) the traffic to. So I don’t see any obvious ways an attacker can really manipulate that to reach (in my case) the bitwarden instance. My main attack angle this protects if is there is some vulnerability in Bitwarden and bots are going around exploiting that. That way at least Traefik would already block them before they get to bitwarden.
But yes another service with a vulnerability could be exploited, then escape that docker container and you’re in the whole server.
