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105

Docker security (lemmy.zip)

submitted 8 months ago* (last edited 8 months ago) by jobbies@lemmy.zip to c/selfhosted@lemmy.world

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You're probably already aware of this, but if you run Docker on linux and use ufw or firewalld - it will bypass all your firewall rules. It doesn't matter what your defaults are or how strict you are about opening ports; Docker has free reign to send and receive from the host as it pleases.

If you are good at manipulating iptables there is a way around this, but it also affects outgoing traffic and could interfere with the bridge. Unless you're a pointy head with a fetish for iptables this will be a world of pain, so isn't really a solution.

There is a tool called ufw-docker that mitigates this by manipulating iptables for you. I was happy with this as a solution and it used to work well on my rig, but for some unknown reason its no-longer working and Docker is back to doing its own thing.

Am I missing an obvious solution here?

It seems odd for a popular tool like Docker - that is also used by enterprise - not to have a pain-free way around this.

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[–] atzanteol@sh.itjust.works 1 points 8 months ago (1 children)

point is, firewalld and iptables is for amateur hour and hobbyists.

Which is weird for you to say since practically all of the issues you list are mistakes that amateurs and hobbyists make.

[–] GreenKnight23@lemmy.world 1 points 8 months ago (1 children)

this is selfhosted. a community that's predominantly amateur or hobbyist.

[–] atzanteol@sh.itjust.works 1 points 8 months ago (1 children)

But absolutely none of the issues you listed are issues with iptables.

[–] GreenKnight23@lemmy.world 1 points 8 months ago (1 children)

I wouldn't go onto a teen community and spout off how to make explosives even though they're relatively safe to a trained individual.

same reason behind not allowing a hobbyist and amateur community to think that iptables and firewalld is the best/only solution.

it's dangerous and someone will get hurt eventually.

[–] atzanteol@sh.itjust.works 1 points 8 months ago

This is... Pretty stupid. There are things to be careful about but it's pretty straight forward to use iptables.