Allow authelia ACLs to be configured through ConfigMaps

clusters/titan.lan.huizinga.dev/infra/authelia.yaml

@@ -10,6 +10,7 @@ spec:
     - name: traefik
     - name: cnpg
     - name: dragonflydb
+    - name: kyverno-policies
   prune: true
   timeout: 2m
   sourceRef:

infra/authelia/kustomization.yaml

@@ -5,6 +5,7 @@ resources:
   - ./namespace.yaml
   - ./helm-repository.yaml
   - ./helm-release.yaml
+  - ./secret-authelia-acl.yaml
   - ./secret-authelia-lldap.yaml
   - ../../common/postgres
   - ../../common/dragonflydb

infra/authelia/secret-authelia-acl.yaml

@@ -0,0 +1,14 @@
+apiVersion: v1
+kind: Secret
+metadata:
+  name: authelia-acl
+stringData:
+  rules: |
+    - domain: traefik.${domain}
+      policy: one_factor
+      subject: "group:lldap_admin"
+    - domain: ceph.${domain}
+      policy: one_factor
+      subject: "group:lldap_admin"
+    - domain: grafana.${domain}
+      policy: one_factor

infra/authelia/values.yaml

@@ -62,15 +62,5 @@ configMap:
       enabled: true
 
   access_control:
-    rules:
-      - domain: traefik.${domain}
-        policy: one_factor
-        subject: "group:lldap_admin"
-      - domain: ceph.${domain}
-        policy: one_factor
-        subject: "group:lldap_admin"
-      - domain: grafana.${domain}
-        policy: one_factor
-      # Deny by default, mainly a placeholder to allow patching in other rules
-      - domain: "*"
-        policy: deny
+    secret:
+      existingSecret: authelia-acl

infra/kyverno-policies/generate-authelia-acl.yaml

@@ -0,0 +1,70 @@
+apiVersion: kyverno.io/v1
+kind: ClusterPolicy
+metadata:
+  name: generate-authelia-acl
+  annotations:
+    policies.kyverno.io/title: Generate Authelia ACL
+    policies.kyverno.io/category: Other
+    policies.kyverno.io/severity: medium
+    policies.kyverno.io/subject: Secret
+    kyverno.io/kyverno-version: 1.7.0
+    policies.kyverno.io/minversion: 1.7.0
+    kyverno.io/kubernetes-version: "1.23"
+spec:
+  rules:
+    - name: update-from-base
+      match:
+        any:
+          - resources:
+              kinds:
+                - Secret
+              name: authelia-acl
+              namespaces:
+                - authelia
+      context:
+        - name: rules
+          apiCall:
+            urlPath: "/api/v1/configmaps"
+            jmesPath: 'join('''', items[?metadata.annotations."config.huizinga.dev/fragment"==''authelia-acl''].data.rules)'
+      mutate:
+        patchStrategicMerge:
+          stringData:
+            "configuration.acl.yaml": |
+              access_control:
+                rules:
+                  {{ replace_all(base64_decode(request.object.data.rules || ''), '
+              ', '
+                  ') }}{{ replace_all(rules, '
+              ', '
+                  ') }}
+
+    - name: update-from-fragment
+      match:
+        any:
+          - resources:
+              kinds:
+                - ConfigMap
+              annotations:
+                config.huizinga.dev/generate: authelia-acl
+      context:
+        - name: rules
+          apiCall:
+            urlPath: "/api/v1/configmaps"
+            jmesPath: 'join('''', items[?metadata.annotations."config.huizinga.dev/fragment"==''authelia-acl''].data.rules)'
+      mutate:
+        mutateExistingOnPolicyUpdate: true
+        targets:
+          - apiVersion: v1
+            kind: Secret
+            name: authelia-acl
+            namespace: authelia
+        patchStrategicMerge:
+          stringData:
+            "configuration.acl.yaml": |
+              access_control:
+                rules:
+                  {{ replace_all(base64_decode(target.data.rules || ''), '
+              ', '
+                  ') }}{{ replace_all(rules, '
+              ', '
+                  ') }}

infra/kyverno-policies/kustomization.yaml

@@ -2,3 +2,4 @@ apiVersion: kustomize.config.k8s.io/v1beta1
 kind: Kustomization
 resources:
   - ./kube-vip-network-adapter.yaml
+  - ./generate-authelia-acl.yaml