Warn about quietly-insecure container UIDs/GIDs

[thockin]

Enhancement Description

• Add information to the API about container UIDs and GIDs and warn when they are set to 0 implicitly
• Kubernetes Enhancement Proposal: https://github.com/kubernetes/enhancements/pull/2168
• Discussion Link: https://twitter.com/thockin/status/1333892204490735617
• Primary contact (assignee): thockin
• Responsible SIGs: sig-node, sig-security
• Enhancement target (which target equals to which milestone):
  • Alpha release target (x.y): 1.21
  • Beta release target (x.y): 1.22
  • Stable release target (x.y): 1.23
• [ ] Alpha
  • [ ] KEP (k/enhancements) update PR(s):
  • [ ] Code (k/k) update PR(s):
  • [ ] Docs (k/website) update PR(s):

Please keep this description up to date. This will help the Enhancement Team to track the evolution of the enhancement efficiently.

[ehashman]

/sig node /sig security

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@fejta-bot: Closing this issue.

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@k8s-triage-robot: Closing this issue.

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The Kubernetes project currently lacks enough active contributors to adequately respond to all issues and PRs.

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@k8s-triage-robot: Closing this issue.

In response to this:

The Kubernetes project currently lacks enough active contributors to adequately respond to all issues and PRs.

This bot triages issues and PRs according to the following rules:

• After 90d of inactivity, lifecycle/stale is applied
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/close

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/lifecycle stale

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/lifecycle stale

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/lifecycle stale

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/lifecycle stale

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/lifecycle stale

[k8s-triage-robot]

The Kubernetes project currently lacks enough contributors to adequately respond to all issues.

This bot triages un-triaged issues according to the following rules:

• After 90d of inactivity, lifecycle/stale is applied
• After 30d of inactivity since lifecycle/stale was applied, lifecycle/rotten is applied
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/lifecycle stale

[kannon92]

@thockin What are your goals for this KEP for 1.32?

[thockin]

Now that the SupplementalGroupsPolicy gate is in, I can piggy-back on that. I have a lot of other KEPs I am tracking/shepherding, but I'd like to revisit this one in 32. If someone was interested in helping, I'd be happy. I don't think this is a ton of work now that it is in.

[haircommander]

I have not heard of anyone picking this up, and we're approaching 1.32 deadline, so I am moving this to "Not for release". Please lemme know if someone here is planning on picking this up.

[thockin]

This is not aimed at 32. Once SupplementalGroupsPolicy goes beta I can pick up again.