apps/authentik/kustomization.yaml

@@ -8,3 +8,4 @@ resources:
   - certificate.yaml
   - authentik.yaml
   - ingress.yaml
+  - networkpolicy.yaml

apps/authentik/networkpolicy.yaml

@@ -0,0 +1,64 @@
+# Default-deny ingress for the authentik namespace, with explicit allow rules for the
+# traffic paths that actually need to reach in: Traefik (kube-system) for the public
+# auth.axion1337.chat endpoint and ACME HTTP-01 challenges, and MAS (matrix namespace)
+# for upstream OIDC calls. Egress is intentionally untouched (federation-equivalent
+# outbound calls like SMTP aren't restricted here).
+#
+# Note: authentik-postgresql already has its own NetworkPolicy from the Bitnami
+# postgresql subchart (port 5432, no source restriction) - left alone, not duplicated,
+# since it would get reset on the next Helm upgrade anyway.
+apiVersion: networking.k8s.io/v1
+kind: NetworkPolicy
+metadata:
+  name: default-deny-ingress
+  namespace: authentik
+spec:
+  podSelector: {}
+  policyTypes:
+    - Ingress
+---
+apiVersion: networking.k8s.io/v1
+kind: NetworkPolicy
+metadata:
+  name: allow-ingress-authentik-server
+  namespace: authentik
+spec:
+  podSelector:
+    matchLabels:
+      app.kubernetes.io/name: authentik
+      app.kubernetes.io/component: server
+  policyTypes:
+    - Ingress
+  ingress:
+    - from:
+        - namespaceSelector:
+            matchLabels:
+              kubernetes.io/metadata.name: kube-system
+        - namespaceSelector:
+            matchLabels:
+              kubernetes.io/metadata.name: matrix
+      ports:
+        - protocol: TCP
+          port: 80
+        - protocol: TCP
+          port: 443
+---
+apiVersion: networking.k8s.io/v1
+kind: NetworkPolicy
+metadata:
+  name: allow-ingress-acme-solver
+  namespace: authentik
+spec:
+  podSelector:
+    matchLabels:
+      acme.cert-manager.io/http01-solver: "true"
+  policyTypes:
+    - Ingress
+  ingress:
+    - from:
+        - namespaceSelector:
+            matchLabels:
+              kubernetes.io/metadata.name: kube-system
+      ports:
+        - protocol: TCP
+          port: 8089