jakman85andClaude Opus 4.8
bb2e9fc931
Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>
58 lines
2.4 KiB
YAML
58 lines
2.4 KiB
YAML
# Serves: R-SEC-01 (in-cluster admission variant)
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#
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# WHY THIS EXISTS (and diverges from the CI policy):
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# The CI policy `disallow-plaintext-secrets` requires a top-level `sops` block on
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# the Secret manifest. That works in CI (it scans the encrypted git manifest) but
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# is IMPOSSIBLE to satisfy at admission: Flux decrypts SOPS *before* the Secret
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# reaches the API server, so an admitted Secret never has a `sops` block. Applying
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# the CI policy in-cluster would reject every real Secret.
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#
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# So the in-cluster invariant is PROVENANCE, not ciphertext: a Secret in an
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# application namespace must have been produced by the SOPS/Flux path (it carries
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# Flux's kustomize labels) OR be an exempt controller-generated Secret. A Secret
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# hand-applied with `kubectl` (the plaintext-into-the-cluster path) has neither and
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# is rejected. This is the enforceable reading of docs/07's "reject a plaintext
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# Secret at admission" -- flagged as an escalation in the T-0.5 report.
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apiVersion: kyverno.io/v1
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kind: ClusterPolicy
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metadata:
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name: secret-provenance
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annotations:
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policies.kyverno.io/title: Require managed provenance on app-namespace Secrets
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policies.kyverno.io/category: Secrets
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policies.kyverno.io/severity: critical
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homelab.keithjackson.dev/requirements: R-SEC-01
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homelab.keithjackson.dev/scope: admission-only
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spec:
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validationFailureAction: Enforce
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background: false
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rules:
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- name: secrets-must-be-flux-managed
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match:
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any:
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- resources:
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kinds:
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- Secret
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namespaceSelector:
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matchLabels:
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homelab.keithjackson.dev/app-namespace: "true"
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# Controller-generated Secrets (SA tokens, cert-manager, Helm) are exempt.
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exclude:
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any:
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- resources:
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selector:
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matchLabels:
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homelab.keithjackson.dev/secret-managed-by: controller
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- resources:
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selector:
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matchExpressions:
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- key: kustomize.toolkit.fluxcd.io/name
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operator: Exists
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validate:
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message: >-
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Secrets in application namespaces must be delivered by Flux from
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SOPS-encrypted git (they carry a kustomize.toolkit.fluxcd.io/name label) or
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be exempt controller-generated Secrets. Hand-applied (plaintext) Secrets are
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rejected (R-SEC-01, docs/07).
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deny: {}
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