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secrets.go
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secrets.go
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// Copyright (c) 2018 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 botanist
import (
"context"
"fmt"
"reflect"
gardencorev1alpha1helper "github.com/gardener/gardener/pkg/apis/core/v1alpha1/helper"
gardencorev1beta1 "github.com/gardener/gardener/pkg/apis/core/v1beta1"
v1beta1constants "github.com/gardener/gardener/pkg/apis/core/v1beta1/constants"
gardencorev1beta1helper "github.com/gardener/gardener/pkg/apis/core/v1beta1/helper"
"github.com/gardener/gardener/pkg/operation/botanist/component/konnectivity"
"github.com/gardener/gardener/pkg/operation/common"
"github.com/gardener/gardener/pkg/operation/seed"
"github.com/gardener/gardener/pkg/operation/shootsecrets"
"github.com/gardener/gardener/pkg/utils"
"github.com/gardener/gardener/pkg/utils/flow"
"github.com/gardener/gardener/pkg/utils/secrets"
corev1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"sigs.k8s.io/controller-runtime/pkg/client"
"sigs.k8s.io/controller-runtime/pkg/controller/controllerutil"
)
// GenerateAndSaveSecrets creates a CA certificate for the Shoot cluster and uses it to sign the server certificate
// used by the kube-apiserver, and all client certificates used for communication. It also creates RSA key
// pairs for SSH connections to the nodes/VMs and for the VPN tunnel. Moreover, basic authentication
// credentials are computed which will be used to secure the Ingress resources and the kube-apiserver itself.
// Server certificates for the exposed monitoring endpoints (via Ingress) are generated as well.
func (b *Botanist) GenerateAndSaveSecrets(ctx context.Context) error {
gardenerResourceDataList := gardencorev1alpha1helper.GardenerResourceDataList(b.ShootState.Spec.Gardener).DeepCopy()
if val, ok := b.Shoot.Info.Annotations[v1beta1constants.GardenerOperation]; ok && val == common.ShootOperationRotateKubeconfigCredentials {
if err := b.rotateKubeconfigSecrets(ctx, &gardenerResourceDataList); err != nil {
return err
}
}
if b.Shoot.Info.DeletionTimestamp == nil {
if b.Shoot.KonnectivityTunnelEnabled {
if err := b.cleanupTunnelSecrets(ctx, &gardenerResourceDataList, "vpn-seed", "vpn-seed-tlsauth", "vpn-shoot"); err != nil {
return err
}
} else {
if err := b.cleanupTunnelSecrets(ctx, &gardenerResourceDataList, konnectivity.SecretNameServerKubeconfig, konnectivity.SecretNameServerTLS); err != nil {
return err
}
}
}
shootWantsBasicAuth := gardencorev1beta1helper.ShootWantsBasicAuthentication(b.Shoot.Info)
shootHasBasicAuth := gardenerResourceDataList.Get(common.BasicAuthSecretName) != nil
if shootWantsBasicAuth != shootHasBasicAuth {
if err := b.deleteBasicAuthDependantSecrets(ctx, &gardenerResourceDataList); err != nil {
return err
}
}
secretsManager := shootsecrets.NewSecretsManager(
gardenerResourceDataList,
b.generateStaticTokenConfig(),
b.wantedCertificateAuthorities(),
b.generateWantedSecretConfigs,
)
if shootWantsBasicAuth {
secretsManager = secretsManager.WithAPIServerBasicAuthConfig(basicAuthSecretAPIServer)
}
if err := secretsManager.Generate(); err != nil {
return err
}
if reflect.DeepEqual(secretsManager.GardenerResourceDataList, gardencorev1alpha1helper.GardenerResourceDataList(b.ShootState.Spec.Gardener)) {
return nil
}
return b.SaveGardenerResourcesInShootState(ctx, secretsManager.GardenerResourceDataList)
}
// DeploySecrets takes all existing secrets from the ShootState resource and deploys them in the shoot's control plane.
func (b *Botanist) DeploySecrets(ctx context.Context) error {
gardenerResourceDataList := gardencorev1alpha1helper.GardenerResourceDataList(b.ShootState.Spec.Gardener)
existingSecrets, err := b.fetchExistingSecrets(ctx)
if err != nil {
return err
}
secretsManager := shootsecrets.NewSecretsManager(
gardenerResourceDataList,
b.generateStaticTokenConfig(),
b.wantedCertificateAuthorities(),
b.generateWantedSecretConfigs,
)
if gardencorev1beta1helper.ShootWantsBasicAuthentication(b.Shoot.Info) {
secretsManager.WithAPIServerBasicAuthConfig(basicAuthSecretAPIServer)
}
if err := secretsManager.WithExistingSecrets(existingSecrets).Deploy(ctx, b.K8sSeedClient.Client(), b.Shoot.SeedNamespace); err != nil {
return err
}
if err := b.storeAPIServerHealthCheckToken(secretsManager.StaticToken); err != nil {
return err
}
if b.Shoot.WantsVerticalPodAutoscaler {
if err := b.storeStaticTokenAsSecrets(ctx, secretsManager.StaticToken, secretsManager.DeployedSecrets[v1beta1constants.SecretNameCACluster].Data[secrets.DataKeyCertificateCA], vpaSecrets); err != nil {
return err
}
}
func() {
b.mutex.Lock()
defer b.mutex.Unlock()
for name, secret := range secretsManager.DeployedSecrets {
b.Secrets[name] = secret
}
for name, secret := range b.Secrets {
b.CheckSums[name] = utils.ComputeSecretCheckSum(secret.Data)
}
}()
wildcardCert, err := seed.GetWildcardCertificate(ctx, b.K8sSeedClient.Client())
if err != nil {
return err
}
if wildcardCert != nil {
// Copy certificate to shoot namespace
crt := &corev1.Secret{
ObjectMeta: metav1.ObjectMeta{
Name: wildcardCert.GetName(),
Namespace: b.Shoot.SeedNamespace,
},
}
if _, err := controllerutil.CreateOrUpdate(ctx, b.K8sSeedClient.Client(), crt, func() error {
crt.Data = wildcardCert.Data
return nil
}); err != nil {
return err
}
b.ControlPlaneWildcardCert = crt
}
return nil
}
// DeployCloudProviderSecret creates or updates the cloud provider secret in the Shoot namespace
// in the Seed cluster.
func (b *Botanist) DeployCloudProviderSecret(ctx context.Context) error {
var (
checksum = utils.ComputeSecretCheckSum(b.Shoot.Secret.Data)
secret = &corev1.Secret{
ObjectMeta: metav1.ObjectMeta{
Name: v1beta1constants.SecretNameCloudProvider,
Namespace: b.Shoot.SeedNamespace,
},
}
)
if _, err := controllerutil.CreateOrUpdate(ctx, b.K8sSeedClient.Client(), secret, func() error {
secret.Annotations = map[string]string{
"checksum/data": checksum,
}
secret.Type = corev1.SecretTypeOpaque
secret.Data = b.Shoot.Secret.Data
return nil
}); err != nil {
return err
}
b.mutex.Lock()
defer b.mutex.Unlock()
b.Secrets[v1beta1constants.SecretNameCloudProvider] = b.Shoot.Secret
b.CheckSums[v1beta1constants.SecretNameCloudProvider] = checksum
return nil
}
func (b *Botanist) fetchExistingSecrets(ctx context.Context) (map[string]*corev1.Secret, error) {
secretList := &corev1.SecretList{}
if err := b.K8sSeedClient.Client().List(ctx, secretList, client.InNamespace(b.Shoot.SeedNamespace)); err != nil {
return nil, err
}
existingSecretsMap := make(map[string]*corev1.Secret, len(secretList.Items))
for _, secret := range secretList.Items {
secretObj := secret
existingSecretsMap[secret.Name] = &secretObj
}
return existingSecretsMap, nil
}
func (b *Botanist) rotateKubeconfigSecrets(ctx context.Context, gardenerResourceDataList *gardencorev1alpha1helper.GardenerResourceDataList) error {
secrets := []string{
common.StaticTokenSecretName,
common.BasicAuthSecretName,
common.KubecfgSecretName,
}
if b.Shoot.KonnectivityTunnelEnabled {
secrets = append(secrets, konnectivity.SecretNameServerKubeconfig)
}
for _, secretName := range secrets {
if err := b.K8sSeedClient.Client().Delete(ctx, &corev1.Secret{ObjectMeta: metav1.ObjectMeta{Name: secretName, Namespace: b.Shoot.SeedNamespace}}); client.IgnoreNotFound(err) != nil {
return err
}
gardenerResourceDataList.Delete(secretName)
}
oldObj := b.Shoot.Info.DeepCopy()
delete(b.Shoot.Info.Annotations, v1beta1constants.GardenerOperation)
return b.K8sGardenClient.Client().Patch(ctx, b.Shoot.Info, client.MergeFrom(oldObj))
}
func (b *Botanist) deleteBasicAuthDependantSecrets(ctx context.Context, gardenerResourceDataList *gardencorev1alpha1helper.GardenerResourceDataList) error {
for _, secretName := range []string{common.BasicAuthSecretName, common.KubecfgSecretName} {
if err := b.K8sSeedClient.Client().Delete(ctx, &corev1.Secret{ObjectMeta: metav1.ObjectMeta{Name: secretName, Namespace: b.Shoot.SeedNamespace}}); client.IgnoreNotFound(err) != nil {
return err
}
gardenerResourceDataList.Delete(secretName)
}
return nil
}
func (b *Botanist) storeAPIServerHealthCheckToken(staticToken *secrets.StaticToken) error {
kubeAPIServerHealthCheckToken, err := staticToken.GetTokenForUsername(common.KubeAPIServerHealthCheck)
if err != nil {
return err
}
b.APIServerHealthCheckToken = kubeAPIServerHealthCheckToken.Token
return nil
}
func (b *Botanist) storeStaticTokenAsSecrets(ctx context.Context, staticToken *secrets.StaticToken, caCert []byte, secretNameToUsername map[string]string) error {
for secretName, username := range secretNameToUsername {
secret := &corev1.Secret{
ObjectMeta: metav1.ObjectMeta{
Name: secretName,
Namespace: b.Shoot.SeedNamespace,
},
Type: corev1.SecretTypeOpaque,
}
token, err := staticToken.GetTokenForUsername(username)
if err != nil {
return err
}
if _, err := controllerutil.CreateOrUpdate(ctx, b.K8sSeedClient.Client(), secret, func() error {
secret.Data = map[string][]byte{
secrets.DataKeyToken: []byte(token.Token),
secrets.DataKeyCertificateCA: caCert,
}
return nil
}); err != nil {
return err
}
b.CheckSums[secretName] = utils.ComputeSecretCheckSum(secret.Data)
}
return nil
}
const (
secretSuffixKubeConfig = "kubeconfig"
secretSuffixSSHKeyPair = v1beta1constants.SecretNameSSHKeyPair
secretSuffixMonitoring = "monitoring"
)
func computeProjectSecretName(shootName, suffix string) string {
return fmt.Sprintf("%s.%s", shootName, suffix)
}
type projectSecret struct {
secretName string
suffix string
annotations map[string]string
labels map[string]string
}
// SyncShootCredentialsToGarden copies the kubeconfig generated for the user, the SSH keypair to
// the project namespace in the Garden cluster and the monitoring credentials for the
// user-facing monitoring stack are also copied.
func (b *Botanist) SyncShootCredentialsToGarden(ctx context.Context) error {
kubecfgURL := common.GetAPIServerDomain(b.Shoot.InternalClusterDomain)
if b.Shoot.ExternalClusterDomain != nil {
kubecfgURL = common.GetAPIServerDomain(*b.Shoot.ExternalClusterDomain)
}
// Secrets which are created by Gardener itself are usually excluded from informers to improve performance.
// Hence, if new secrets are synced to the Garden cluster, please consider adding the used `gardener.cloud/role`
// label value to the `v1beta1constants.ControlPlaneSecretRoles` list.
projectSecrets := []projectSecret{
{
secretName: common.KubecfgSecretName,
suffix: secretSuffixKubeConfig,
annotations: map[string]string{"url": "https://" + kubecfgURL},
labels: map[string]string{v1beta1constants.GardenRole: v1beta1constants.GardenRoleKubeconfig},
},
{
secretName: v1beta1constants.SecretNameSSHKeyPair,
suffix: secretSuffixSSHKeyPair,
labels: map[string]string{v1beta1constants.GardenRole: v1beta1constants.GardenRoleSSHKeyPair},
},
{
secretName: "monitoring-ingress-credentials-users",
suffix: secretSuffixMonitoring,
annotations: map[string]string{"url": "https://" + b.ComputeGrafanaUsersHost()},
labels: map[string]string{v1beta1constants.GardenRole: v1beta1constants.GardenRoleMonitoring},
},
}
var fns []flow.TaskFn
for _, projectSecret := range projectSecrets {
s := projectSecret
fns = append(fns, func(ctx context.Context) error {
secretObj := &corev1.Secret{
ObjectMeta: metav1.ObjectMeta{
Name: computeProjectSecretName(b.Shoot.Info.Name, s.suffix),
Namespace: b.Shoot.Info.Namespace,
},
}
_, err := controllerutil.CreateOrUpdate(ctx, b.K8sGardenClient.Client(), secretObj, func() error {
secretObj.OwnerReferences = []metav1.OwnerReference{
*metav1.NewControllerRef(b.Shoot.Info, gardencorev1beta1.SchemeGroupVersion.WithKind("Shoot")),
}
secretObj.Annotations = s.annotations
secretObj.Labels = s.labels
secretObj.Type = corev1.SecretTypeOpaque
secretObj.Data = b.Secrets[s.secretName].Data
return nil
})
return err
})
}
return flow.Parallel(fns...)(ctx)
}
func (b *Botanist) cleanupTunnelSecrets(ctx context.Context, gardenerResourceDataList *gardencorev1alpha1helper.GardenerResourceDataList, secretNames ...string) error {
// TODO: remove when all Gardener supported versions are >= 1.18
for _, secret := range secretNames {
if err := b.K8sSeedClient.Client().Delete(ctx, &corev1.Secret{ObjectMeta: metav1.ObjectMeta{Name: secret, Namespace: b.Shoot.SeedNamespace}}); client.IgnoreNotFound(err) != nil {
return err
}
gardenerResourceDataList.Delete(secret)
}
return nil
}