Initial commit

infrastructure/kyverno/policies/disallow-host-namespaces.yaml

@@ -0,0 +1,40 @@
+apiVersion: kyverno.io/v1
+kind: ClusterPolicy
+metadata:
+  name: disallow-host-namespaces
+  annotations:
+    policies.kyverno.io/title: Disallow Host Namespaces
+    policies.kyverno.io/category: DoD STIG
+    policies.kyverno.io/severity: high
+    policies.kyverno.io/description: >-
+      STIG V-242386: Containers must not share the host process ID, IPC,
+      or network namespace. Sharing host namespaces allows containers to
+      access host-level resources and break isolation boundaries.
+spec:
+  validationFailureAction: Enforce
+  background: true
+  rules:
+    - name: host-namespaces
+      match:
+        any:
+          - resources:
+              kinds:
+                - Pod
+      exclude:
+        any:
+          - resources:
+              namespaces:
+                - kube-system
+                - rook-ceph
+                - istio-system
+                - prometheus
+                - kyverno
+                - crowdsec
+      validate:
+        message: >-
+          Sharing host PID, IPC, or network namespaces is not allowed (STIG V-242386).
+        pattern:
+          spec:
+            =(hostPID): false
+            =(hostIPC): false
+            =(hostNetwork): false