Create AppArmor profile for the operator

[pjbgf]

What would you like to be added:

A tailor-made AppArmor profile to restrict functionality to the minimum required for the operator to run.

Why is this needed:

Better define the attack surface, giving users a clear view of what the operator can/cannot do.

/area security
/priority important-longterm

[saschagrunert]

I love that! Would the deployment work in the same way like we do in #52?

Since the complexity of the init container seems to increase we could think about wrapping it in an own container/binary. 😅

[pjbgf]

Yes, we probably would have to deploy it in the same way as #52.

As for its own binary, there are a few issues as we discussed off-line. We could isolate each one of those "self profile deployment" in specific init containers, that could make it easier for easier to opt-out.

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[pjbgf]

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[saschagrunert]

@pjbgf do you have any update on this one?

[pjbgf]

@saschagrunert I should get something ready this week.

[pjbgf]

@saschagrunert we may need to think on a different approach to deploy the operator's own apparmor profile, as I mentioned on the PR and on the k8s issue (kubernetes/kubernetes#97273), the approach taken on seccomp does not work for AppArmor.

[saschagrunert]

@saschagrunert we may need to think on a different approach to deploy the operator's own apparmor profile, as I mentioned on the PR and on the k8s issue (kubernetes/kubernetes#97273), the approach taken on seccomp does not work for AppArmor.

Sounds good, let's put it on the agenda for the community meeting this week. 👍

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[pjbgf]

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[pjbgf]

@pjbgf I assume we prefer the kube-native way? Would it be possible to apply the profile only on specific kubernetes versions by checking it before deploying the daemon?

@saschagrunert yes, I think we are better off doing kube-native, which in this case would mean deploying the profile in a container init.
Now I am not sure how we would check the Kubernetes version to be honest. The changes upstream affected the Kubelet iirc, so this could mean that nodes in different version could break. Potentially the daemonset could just check "is my AppAmor profile loaded? If so, use it, otherwise fall-back to default".

[pjbgf]

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[saschagrunert]

Potentially the daemonset could just check "is my AppAmor profile loaded? If so, use it, otherwise fall-back to default".

Yes I think this would make sense 👍

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