41ac27ad31
* Add an admission webhook to check cluster ID (kube-system UID) before updating * Add an admission webhook to check cluster ID (kube-system UID) before updating
86 lines
2.5 KiB
Go
86 lines
2.5 KiB
Go
/*
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Copyright 2020 The KubeSphere Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package cluster
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import (
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"context"
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"fmt"
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"net/http"
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v1 "k8s.io/api/admission/v1"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/client-go/kubernetes"
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"k8s.io/client-go/tools/clientcmd"
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"sigs.k8s.io/controller-runtime/pkg/client"
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"sigs.k8s.io/controller-runtime/pkg/webhook/admission"
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clusterv1alpha1 "kubesphere.io/api/cluster/v1alpha1"
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)
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type ValidatingHandler struct {
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Client client.Client
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decoder *admission.Decoder
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}
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var _ admission.DecoderInjector = &ValidatingHandler{}
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// InjectDecoder injects the decoder into a ValidatingHandler.
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func (h *ValidatingHandler) InjectDecoder(d *admission.Decoder) error {
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h.decoder = d
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return nil
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}
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// Handle handles admission requests.
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func (h *ValidatingHandler) Handle(ctx context.Context, req admission.Request) admission.Response {
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if req.Operation != v1.Update {
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return admission.Allowed("")
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}
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newCluster := &clusterv1alpha1.Cluster{}
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err := h.decoder.DecodeRaw(req.Object, newCluster)
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if err != nil {
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return admission.Errored(http.StatusBadRequest, err)
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}
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oldCluster := &clusterv1alpha1.Cluster{}
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err = h.decoder.DecodeRaw(req.OldObject, oldCluster)
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if err != nil {
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return admission.Errored(http.StatusBadRequest, err)
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}
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clusterConfig, err := clientcmd.RESTConfigFromKubeConfig(newCluster.Spec.Connection.KubeConfig)
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if err != nil {
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return admission.Denied(fmt.Sprintf("failed to load cluster config for %s: %s", newCluster.Name, err))
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}
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clusterClient, err := kubernetes.NewForConfig(clusterConfig)
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if err != nil {
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return admission.Denied(err.Error())
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}
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kubeSystem, err := clusterClient.CoreV1().Namespaces().Get(ctx, metav1.NamespaceSystem, metav1.GetOptions{})
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if err != nil {
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return admission.Denied(err.Error())
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}
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if oldCluster.Status.UID != kubeSystem.UID {
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return admission.Denied("this kubeconfig corresponds to a different cluster than the previous one, you need to make sure that kubeconfig is not from another cluster")
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}
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return admission.Allowed("")
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}
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