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node.go
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node.go
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// SPDX-FileCopyrightText: 2024 SAP SE or an SAP affiliate company and Gardener contributors
//
// SPDX-License-Identifier: Apache-2.0
package kubernetes
import (
"strings"
corev1 "k8s.io/api/core/v1"
kubeletapis "k8s.io/kubelet/pkg/apis"
)
// IsNodeLabelAllowedForKubelet determines whether kubelet is allowed by the NodeRestriction admission plugin to set a
// label on its own Node object with the given key.
// See https://kubernetes.io/docs/reference/access-authn-authz/admission-controllers/#noderestriction.
func IsNodeLabelAllowedForKubelet(key string) bool {
namespace := getLabelNamespace(key)
// kubelets are forbidden to set node-restriction labels
if namespace == corev1.LabelNamespaceNodeRestriction || strings.HasSuffix(namespace, "."+corev1.LabelNamespaceNodeRestriction) {
return false
}
// kubelets are forbidden to set unknown kubernetes.io and k8s.io labels
if isKubernetesLabelNamespace(namespace) && !kubeletapis.IsKubeletLabel(key) {
return false
}
return true
}
// same logic as in kube-apiserver and kubelet code
func getLabelNamespace(key string) string {
if parts := strings.SplitN(key, "/", 2); len(parts) == 2 {
return parts[0]
}
return ""
}
func isKubernetesLabelNamespace(namespace string) bool {
if namespace == "kubernetes.io" || strings.HasSuffix(namespace, ".kubernetes.io") {
return true
}
if namespace == "k8s.io" || strings.HasSuffix(namespace, ".k8s.io") {
return true
}
return false
}