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kubeconfig.go
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kubeconfig.go
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// Copyright 2022 SAP SE or an SAP affiliate company. All rights reserved. This file is licensed under the Apache Software License, v. 2 except as noted otherwise in the LICENSE file
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package rotation
import (
"context"
"time"
. "github.com/onsi/ginkgo/v2"
. "github.com/onsi/gomega"
corev1 "k8s.io/api/core/v1"
clientcmdlatest "k8s.io/client-go/tools/clientcmd/api/latest"
clientcmdv1 "k8s.io/client-go/tools/clientcmd/api/v1"
"sigs.k8s.io/controller-runtime/pkg/client"
gardenerutils "github.com/gardener/gardener/pkg/utils/gardener"
"github.com/gardener/gardener/test/framework"
)
// KubeconfigVerifier verifies the kubeconfig credentials rotation.
type KubeconfigVerifier struct {
*framework.ShootCreationFramework
oldKubeconfigData map[string][]byte
newKubeconfigData map[string][]byte
}
// Before is called before the rotation is started.
func (v *KubeconfigVerifier) Before(ctx context.Context) {
By("Verify old kubeconfig secret")
Eventually(func(g Gomega) {
secret := &corev1.Secret{}
g.Expect(v.GardenClient.Client().Get(ctx, client.ObjectKey{Namespace: v.Shoot.Namespace, Name: gardenerutils.ComputeShootProjectSecretName(v.Shoot.Name, "kubeconfig")}, secret)).To(Succeed())
g.Expect(secret.Data).To(And(
HaveKeyWithValue("ca.crt", Not(BeEmpty())),
HaveKeyWithValue("kubeconfig", Not(BeEmpty())),
))
v.oldKubeconfigData = secret.Data
kubeconfig := &clientcmdv1.Config{}
_, _, err := clientcmdlatest.Codec.Decode(secret.Data["kubeconfig"], nil, kubeconfig)
Expect(err).NotTo(HaveOccurred())
Expect(kubeconfig.Clusters).To(HaveLen(1))
Expect(kubeconfig.Clusters[0].Cluster.CertificateAuthorityData).To(Equal(secret.Data["ca.crt"]))
Expect(kubeconfig.AuthInfos).To(HaveLen(1))
Expect(kubeconfig.AuthInfos[0].AuthInfo.Token).NotTo(BeEmpty())
}).Should(Succeed(), "old kubeconfig secret should be present")
}
// ExpectPreparingStatus is called while waiting for the Preparing status.
func (v *KubeconfigVerifier) ExpectPreparingStatus(g Gomega) {
g.Expect(time.Now().UTC().Sub(v.Shoot.Status.Credentials.Rotation.Kubeconfig.LastInitiationTime.Time.UTC())).To(BeNumerically("<=", time.Minute))
}
// AfterPrepared is called when the Shoot is in Prepared status.
func (v *KubeconfigVerifier) AfterPrepared(ctx context.Context) {
kubeconfigRotation := v.Shoot.Status.Credentials.Rotation.Kubeconfig
Expect(kubeconfigRotation.LastCompletionTime.Time.UTC().After(kubeconfigRotation.LastInitiationTime.Time.UTC())).To(BeTrue())
By("Verify new kubeconfig secret")
Eventually(func(g Gomega) {
secret := &corev1.Secret{}
g.Expect(v.GardenClient.Client().Get(ctx, client.ObjectKey{Namespace: v.Shoot.Namespace, Name: gardenerutils.ComputeShootProjectSecretName(v.Shoot.Name, "kubeconfig")}, secret)).To(Succeed())
g.Expect(secret.Data).To(And(
HaveKeyWithValue("ca.crt", Not(Equal(v.oldKubeconfigData["ca.crt"]))),
HaveKeyWithValue("kubeconfig", Not(Equal(v.oldKubeconfigData["kubeconfig"]))),
))
v.newKubeconfigData = secret.Data
kubeconfig := &clientcmdv1.Config{}
_, _, err := clientcmdlatest.Codec.Decode(secret.Data["kubeconfig"], nil, kubeconfig)
Expect(err).NotTo(HaveOccurred())
Expect(kubeconfig.Clusters).To(HaveLen(1))
Expect(kubeconfig.Clusters[0].Cluster.CertificateAuthorityData).To(Equal(secret.Data["ca.crt"]))
Expect(kubeconfig.AuthInfos).To(HaveLen(1))
Expect(kubeconfig.AuthInfos[0].AuthInfo.Token).NotTo(BeEmpty())
}).Should(Succeed(), "kubeconfig secret should have been rotated")
}
// ExpectCompletingStatus is called while waiting for the Completing status.
func (v *KubeconfigVerifier) ExpectCompletingStatus(g Gomega) {
// there is no second phase for the kubeconfig rotation
}
// AfterCompleted is called when the Shoot is in Completed status.
func (v *KubeconfigVerifier) AfterCompleted(ctx context.Context) {
// Rotation of the kubeconfig credential (static token) as such is completed after one reconciliation
// (there is no second phase). Hence, after completing the credentials rotation the token will be the same as after
// preparation. We want to inspect the contained CA nevertheless, which must have changed after Completion.
By("Verify new kubeconfig secret with new CA")
Eventually(func(g Gomega) {
secret := &corev1.Secret{}
g.Expect(v.GardenClient.Client().Get(ctx, client.ObjectKey{Namespace: v.Shoot.Namespace, Name: gardenerutils.ComputeShootProjectSecretName(v.Shoot.Name, "kubeconfig")}, secret)).To(Succeed())
g.Expect(secret.Data).To(And(
HaveKeyWithValue("ca.crt", Not(Equal(v.newKubeconfigData["ca.crt"]))),
HaveKeyWithValue("kubeconfig", Not(Equal(v.newKubeconfigData["kubeconfig"]))),
))
kubeconfig := &clientcmdv1.Config{}
_, _, err := clientcmdlatest.Codec.Decode(secret.Data["kubeconfig"], nil, kubeconfig)
Expect(err).NotTo(HaveOccurred())
Expect(kubeconfig.Clusters).To(HaveLen(1))
Expect(kubeconfig.Clusters[0].Cluster.CertificateAuthorityData).To(Equal(secret.Data["ca.crt"]))
Expect(kubeconfig.AuthInfos).To(HaveLen(1))
Expect(kubeconfig.AuthInfos[0].AuthInfo.Token).NotTo(BeEmpty())
}).Should(Succeed(), "kubeconfig secret should have been rotated")
}