Initial commit

infrastructure/kyverno/policies/require-ro-rootfs.yaml

@@ -0,0 +1,39 @@
+apiVersion: kyverno.io/v1
+kind: ClusterPolicy
+metadata:
+  name: require-readonly-rootfs
+  annotations:
+    policies.kyverno.io/title: Require Read-Only Root Filesystem
+    policies.kyverno.io/category: Zero Trust
+    policies.kyverno.io/severity: low
+spec:
+  validationFailureAction: Audit
+  background: true
+  rules:
+    - name: require-ro-rootfs
+      match:
+        any:
+          - resources:
+              kinds:
+                - Pod
+      exclude:
+        any:
+          - resources:
+              namespaces:
+                - kube-system
+                - rook-ceph
+                - istio-system
+                - kyverno
+                - tetragon
+                - prometheus
+                - authentik
+                - gitlab
+                - nextcloud
+                - home-assistant
+      validate:
+        message: "Containers should use a read-only root filesystem."
+        pattern:
+          spec:
+            containers:
+              - =(securityContext):
+                  =(readOnlyRootFilesystem): true