Add RBAC files for metrics authentication and authorization

metal3-io#2102 has introduced controller-runtime's WithAuthenticationAndAuthorization filter which also requires extra RBAC roles and role bindings for metrics authentication and authorization. This PR adds those.

Signed-off-by: Kashif Khan <kashif.khan@est.tech>

config/base/rbac/kustomization.yaml

@@ -9,3 +9,13 @@ resources:
 - role_binding.yaml
 - leader_election_role.yaml
 - leader_election_role_binding.yaml
+# The following RBAC configurations are used to protect
+# the metrics endpoint with authn/authz. These configurations
+# ensure that only authorized users and service accounts
+# can access the metrics endpoint. Comment the following
+# permissions if you want to disable this protection.
+# More info: https://book.kubebuilder.io/reference/metrics.html
+- metrics_auth_role.yaml
+- metrics_auth_role_binding.yaml
+- metrics_reader_role.yaml
+- metrics_service.yaml

config/base/rbac/metrics_auth_role.yaml

@@ -0,0 +1,17 @@
+apiVersion: rbac.authorization.k8s.io/v1
+kind: ClusterRole
+metadata:
+  name: metrics-auth-role
+rules:
+- apiGroups:
+  - authentication.k8s.io
+  resources:
+  - tokenreviews
+  verbs:
+  - create
+- apiGroups:
+  - authorization.k8s.io
+  resources:
+  - subjectaccessreviews
+  verbs:
+  - create

config/base/rbac/metrics_auth_role_binding.yaml

@@ -0,0 +1,12 @@
+apiVersion: rbac.authorization.k8s.io/v1
+kind: ClusterRoleBinding
+metadata:
+  name: metrics-auth-rolebinding
+roleRef:
+  apiGroup: rbac.authorization.k8s.io
+  kind: ClusterRole
+  name: metrics-auth-role
+subjects:
+- kind: ServiceAccount
+  name: controller-manager
+  namespace: system

config/base/rbac/metrics_reader_role.yaml

@@ -0,0 +1,9 @@
+apiVersion: rbac.authorization.k8s.io/v1
+kind: ClusterRole
+metadata:
+  name: metrics-reader
+rules:
+- nonResourceURLs:
+  - "/metrics"
+  verbs:
+  - get

config/base/rbac/metrics_service.yaml

@@ -0,0 +1,14 @@
+apiVersion: v1
+kind: Service
+metadata:
+  labels:
+    control-plane: controller-manager
+  name: controller-manager-metrics-service
+  namespace: system
+spec:
+  ports:
+  - name: https
+    port: 8443
+    targetPort: https
+  selector:
+    control-plane: controller-manager

config/render/capm3.yaml

@@ -2435,6 +2435,34 @@ rules:
   - watch
 ---
 apiVersion: rbac.authorization.k8s.io/v1
+kind: ClusterRole
+metadata:
+  name: baremetal-operator-metrics-auth-role
+rules:
+- apiGroups:
+  - authentication.k8s.io
+  resources:
+  - tokenreviews
+  verbs:
+  - create
+- apiGroups:
+  - authorization.k8s.io
+  resources:
+  - subjectaccessreviews
+  verbs:
+  - create
+---
+apiVersion: rbac.authorization.k8s.io/v1
+kind: ClusterRole
+metadata:
+  name: baremetal-operator-metrics-reader
+rules:
+- nonResourceURLs:
+  - /metrics
+  verbs:
+  - get
+---
+apiVersion: rbac.authorization.k8s.io/v1
 kind: RoleBinding
 metadata:
   name: baremetal-operator-leader-election-rolebinding
@@ -2461,6 +2489,19 @@ subjects:
   name: baremetal-operator-controller-manager
   namespace: baremetal-operator-system
 ---
+apiVersion: rbac.authorization.k8s.io/v1
+kind: ClusterRoleBinding
+metadata:
+  name: baremetal-operator-metrics-auth-rolebinding
+roleRef:
+  apiGroup: rbac.authorization.k8s.io
+  kind: ClusterRole
+  name: baremetal-operator-metrics-auth-role
+subjects:
+- kind: ServiceAccount
+  name: baremetal-operator-controller-manager
+  namespace: baremetal-operator-system
+---
 apiVersion: v1
 data:
   CACHEURL: http://172.22.0.1/images
@@ -2477,6 +2518,21 @@ metadata:
 ---
 apiVersion: v1
 kind: Service
+metadata:
+  labels:
+    control-plane: controller-manager
+  name: baremetal-operator-controller-manager-metrics-service
+  namespace: baremetal-operator-system
+spec:
+  ports:
+  - name: https
+    port: 8443
+    targetPort: https
+  selector:
+    control-plane: controller-manager
+---
+apiVersion: v1
+kind: Service
 metadata:
   name: baremetal-operator-webhook-service
   namespace: baremetal-operator-system