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[WIP] 🌱 Change crt permissions in KCP to 0600 #12648

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[WIP] 🌱 Change crt permissions in KCP to 0600 #12648

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2 changes: 1 addition & 1 deletion util/secret/certificates.go
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Expand Up @@ -393,7 +393,7 @@ func (c *Certificate) AsFiles() []bootstrapv1.File {
out = append(out, bootstrapv1.File{
Path: c.CertFile,
Owner: rootOwnerValue,
Permissions: "0640",
Permissions: "0600",
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@sbueringer sbueringer Aug 19, 2025 •
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Context:

I wonder if 0600 leads to problems with: kubernetes/kubeadm#2473 (comment)

@neolit123 What do you think?

Is there a way that I can verify this works with userns? Do I only have to use Kubernetes >= 1.33?

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if i understand how userns works, this might be fine. you can test with any new release that has userns support. i don't think we ever tested kubeadm with userns yet, fwiw.

they are still fixing bugs and updating docs for the feature and we need it to be ga.

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also, cis has been annoying since it doesn't consider permissions of the parent dir. distributions on top of kubeadm and capi ca choose to generate their own certs, but that's extra work.

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I was wondering if "userns is being enabled by default in 1.33" (kubernetes/kubeadm#2473 (comment)) means that it's also used for static Pods per default

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it's enabled in core k8s, but pod users must opt-in; kubeadm hasn't yet.

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Got it, thx!

Content: string(c.KeyPair.Cert),
})
}
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