Merge pull request #57128 from liggitt/kubelet-admin

Automatic merge from submit-queue (batch tested with PRs 57702, 57128). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.

Define default role for full kubelet API access

This makes sense to define uniformly so integrators can grant this to the `--kubelet-client-certificate` credential given to the apiserver. Mirrors the role GCE sets up.

```release-note
RBAC: The system:kubelet-api-admin cluster role can be used to grant full access to the kubelet API
```

plugin/pkg/auth/authorizer/rbac/bootstrappolicy/policy.go

@@ -350,6 +350,17 @@ func ClusterRoles() []rbac.ClusterRole {
 				eventsRule(),
 			},
 		},
+		{
+			// a role to use for full access to the kubelet API
+			ObjectMeta: metav1.ObjectMeta{Name: "system:kubelet-api-admin"},
+			Rules: []rbac.PolicyRule{
+				// Allow read-only access to the Node API objects
+				rbac.NewRule("get", "list", "watch").Groups(legacyGroup).Resources("nodes").RuleOrDie(),
+				// Allow all API calls to the nodes
+				rbac.NewRule("proxy").Groups(legacyGroup).Resources("nodes").RuleOrDie(),
+				rbac.NewRule("*").Groups(legacyGroup).Resources("nodes/proxy", "nodes/metrics", "nodes/spec", "nodes/stats", "nodes/log").RuleOrDie(),
+			},
+		},
 		{
 			// a role to use for bootstrapping a node's client certificates
 			ObjectMeta: metav1.ObjectMeta{Name: "system:node-bootstrapper"},

plugin/pkg/auth/authorizer/rbac/bootstrappolicy/testdata/cluster-roles.yaml

@@ -880,6 +880,40 @@ items:
     - get
     - list
     - watch
+- apiVersion: rbac.authorization.k8s.io/v1
+  kind: ClusterRole
+  metadata:
+    annotations:
+      rbac.authorization.kubernetes.io/autoupdate: "true"
+    creationTimestamp: null
+    labels:
+      kubernetes.io/bootstrapping: rbac-defaults
+    name: system:kubelet-api-admin
+  rules:
+  - apiGroups:
+    - ""
+    resources:
+    - nodes
+    verbs:
+    - get
+    - list
+    - watch
+  - apiGroups:
+    - ""
+    resources:
+    - nodes
+    verbs:
+    - proxy
+  - apiGroups:
+    - ""
+    resources:
+    - nodes/log
+    - nodes/metrics
+    - nodes/proxy
+    - nodes/spec
+    - nodes/stats
+    verbs:
+    - '*'
 - apiVersion: rbac.authorization.k8s.io/v1
   kind: ClusterRole
   metadata: