/
secrets.go
489 lines (422 loc) · 17.7 KB
/
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"
"encoding/json"
"time"
gardencorev1alpha1 "github.com/gardener/gardener/pkg/apis/core/v1alpha1"
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/controllerutils"
"github.com/gardener/gardener/pkg/operation/botanist/component/kubeapiserver"
"github.com/gardener/gardener/pkg/operation/botanist/component/logging"
"github.com/gardener/gardener/pkg/operation/botanist/component/vpnseedserver"
"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"
gutil "github.com/gardener/gardener/pkg/utils/gardener"
kutil "github.com/gardener/gardener/pkg/utils/kubernetes"
secretutils "github.com/gardener/gardener/pkg/utils/secrets"
corev1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/runtime"
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"
)
// 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 {
return b.SaveGardenerResourceDataInShootState(ctx, func(gardenerResourceData *[]gardencorev1alpha1.GardenerResourceData) error {
gardenerResourceDataList := gardencorev1alpha1helper.GardenerResourceDataList(*gardenerResourceData)
// Remove legacy secrets from ShootState.
// TODO(rfranzke): Remove in a future version.
for _, name := range []string{
"kube-scheduler",
"kube-controller-manager",
"cluster-autoscaler",
"kube-state-metrics",
// TODO(rfranzke): Uncomment this in a future release once all monitoring configurations of extensions have been
// adapted.
// "prometheus",
} {
gardenerResourceDataList.Delete(name)
}
switch b.Shoot.GetInfo().Annotations[v1beta1constants.GardenerOperation] {
case v1beta1constants.ShootOperationRotateKubeconfigCredentials:
if err := b.rotateKubeconfigSecrets(ctx, &gardenerResourceDataList); err != nil {
return err
}
case v1beta1constants.ShootOperationRotateSSHKeypair:
if err := b.rotateSSHKeypairSecrets(ctx, &gardenerResourceDataList); err != nil {
return err
}
}
if b.Shoot.GetInfo().DeletionTimestamp == nil {
if b.Shoot.ReversedVPNEnabled {
if err := b.cleanupSecrets(ctx, &gardenerResourceDataList, kubeapiserver.SecretNameVPNSeed, kubeapiserver.SecretNameVPNSeedTLSAuth, "vpn-shoot"); err != nil {
return err
}
// Delete existing VPN-related secrets which were not signed with the newly introduced ca-vpn so that
// they get regenerated.
// TODO(rfranzke): Remove in a future version.
if gardenerResourceDataList.Get(v1beta1constants.SecretNameCAVPN) == nil {
if err := b.cleanupSecrets(ctx, &gardenerResourceDataList,
vpnseedserver.DeploymentName,
kubeapiserver.SecretNameHTTPProxy,
vpnseedserver.VpnShootSecretName,
); err != nil {
return err
}
}
} else {
if err := b.cleanupSecrets(ctx, &gardenerResourceDataList,
vpnseedserver.DeploymentName,
vpnseedserver.VpnShootSecretName,
vpnseedserver.VpnSeedServerTLSAuth,
kubeapiserver.SecretNameHTTPProxy); err != nil {
return err
}
}
if !gardencorev1beta1helper.SeedSettingDependencyWatchdogProbeEnabled(b.Seed.GetInfo().Spec.Settings) {
if err := b.cleanupSecrets(ctx, &gardenerResourceDataList, kubeapiserver.DependencyWatchdogInternalProbeSecretName, kubeapiserver.DependencyWatchdogExternalProbeSecretName); err != nil {
return err
}
}
}
// Trigger replacement of operator/user facing certificates if required
expiredTLSSecrets, err := getExpiredCerts(gardenerResourceDataList, common.CrtRenewalWindow, common.IngressTLSSecretNames...)
if err != nil {
return err
}
if len(expiredTLSSecrets) > 0 {
b.Logger.Infof("Deleting secrets for certificate rotation: %v", expiredTLSSecrets)
if err := b.deleteSecrets(ctx, &gardenerResourceDataList, expiredTLSSecrets...); err != nil {
return err
}
}
shootWantsBasicAuth := gardencorev1beta1helper.ShootWantsBasicAuthentication(b.Shoot.GetInfo())
shootHasBasicAuth := gardenerResourceDataList.Get(kubeapiserver.SecretNameBasicAuth) != 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
}
*gardenerResourceData = secretsManager.GardenerResourceDataList
return nil
})
}
// 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.GetShootState().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.GetInfo()) {
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.isShootNodeLoggingEnabled() {
if err := b.storePromtailRBACAuthToken(secretsManager.StaticToken); err != nil {
return err
}
}
for name, secret := range secretsManager.DeployedSecrets {
b.StoreSecret(name, secret)
}
for _, name := range b.AllSecretKeys() {
b.StoreCheckSum(name, utils.ComputeSecretChecksum(b.LoadSecret(name).Data))
}
wildcardCert, err := seed.GetWildcardCertificate(ctx, b.K8sSeedClient.Client())
if err != nil {
return err
}
if wildcardCert != nil {
// Copy certificate to shoot namespace
certSecret := &corev1.Secret{
ObjectMeta: metav1.ObjectMeta{
Name: wildcardCert.GetName(),
Namespace: b.Shoot.SeedNamespace,
},
}
if _, err := controllerutils.GetAndCreateOrMergePatch(ctx, b.K8sSeedClient.Client(), certSecret, func() error {
certSecret.Data = wildcardCert.Data
return nil
}); err != nil {
return err
}
b.ControlPlaneWildcardCert = certSecret
}
return b.reconcileGenericKubeconfigSecret(ctx)
}
func (b *Botanist) reconcileGenericKubeconfigSecret(ctx context.Context) error {
secret := &corev1.Secret{
ObjectMeta: metav1.ObjectMeta{
Name: v1beta1constants.SecretNameGenericTokenKubeconfig,
Namespace: b.Shoot.SeedNamespace,
},
}
kubeconfig, err := runtime.Encode(clientcmdlatest.Codec, kutil.NewKubeconfig(
b.Shoot.SeedNamespace,
b.Shoot.ComputeInClusterAPIServerAddress(true),
b.LoadSecret(v1beta1constants.SecretNameCACluster).Data[secretutils.DataKeyCertificateCA],
clientcmdv1.AuthInfo{TokenFile: gutil.PathShootToken},
))
if err != nil {
return err
}
_, err = controllerutils.CreateOrGetAndMergePatch(ctx, b.K8sSeedClient.Client(), secret, func() error {
secret.Type = corev1.SecretTypeOpaque
secret.Data = map[string][]byte{secretutils.DataKeyKubeconfig: kubeconfig}
return nil
})
return err
}
// 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 := controllerutils.GetAndCreateOrMergePatch(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.StoreSecret(v1beta1constants.SecretNameCloudProvider, b.Shoot.Secret)
b.StoreCheckSum(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
}
// deleteSecrets removes the given secrets from the shoot namespace in the seed
// as well as removes it from the given `gardenerResourceDataList`.
func (b *Botanist) deleteSecrets(ctx context.Context, gardenerResourceDataList *gardencorev1alpha1helper.GardenerResourceDataList, secretNames ...string) error {
for _, secretName := range secretNames {
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) rotateKubeconfigSecrets(ctx context.Context, gardenerResourceDataList *gardencorev1alpha1helper.GardenerResourceDataList) error {
secrets := []string{
kubeapiserver.SecretNameStaticToken,
kubeapiserver.SecretNameBasicAuth,
common.KubecfgSecretName,
}
if err := b.deleteSecrets(ctx, gardenerResourceDataList, secrets...); err != nil {
return err
}
// remove operation annotation
return b.Shoot.UpdateInfo(ctx, b.K8sGardenClient.Client(), false, func(shoot *gardencorev1beta1.Shoot) error {
delete(shoot.Annotations, v1beta1constants.GardenerOperation)
return nil
})
}
func (b *Botanist) rotateSSHKeypairSecrets(ctx context.Context, gardenerResourceDataList *gardencorev1alpha1helper.GardenerResourceDataList) error {
currentSecret := gardenerResourceDataList.Get(v1beta1constants.SecretNameSSHKeyPair)
if currentSecret == nil {
b.Logger.Debugf("No %s Secret loaded, not rotating keypair.", v1beta1constants.SecretNameSSHKeyPair)
return nil
}
// copy current key to old secret
oldSecret := currentSecret.DeepCopy()
oldSecret.Name = v1beta1constants.SecretNameOldSSHKeyPair
gardenerResourceDataList.Upsert(oldSecret)
names := []string{
v1beta1constants.SecretNameSSHKeyPair,
v1beta1constants.SecretNameOldSSHKeyPair,
}
for _, secretName := range names {
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(v1beta1constants.SecretNameSSHKeyPair)
// remove operation annotation
return b.Shoot.UpdateInfo(ctx, b.K8sGardenClient.Client(), false, func(shoot *gardencorev1beta1.Shoot) error {
delete(shoot.Annotations, v1beta1constants.GardenerOperation)
return nil
})
}
func (b *Botanist) deleteBasicAuthDependantSecrets(ctx context.Context, gardenerResourceDataList *gardencorev1alpha1helper.GardenerResourceDataList) error {
return b.deleteSecrets(ctx, gardenerResourceDataList, kubeapiserver.SecretNameBasicAuth, common.KubecfgSecretName)
}
func (b *Botanist) storeAPIServerHealthCheckToken(staticToken *secretutils.StaticToken) error {
kubeAPIServerHealthCheckToken, err := staticToken.GetTokenForUsername(common.KubeAPIServerHealthCheck)
if err != nil {
return err
}
b.APIServerHealthCheckToken = kubeAPIServerHealthCheckToken.Token
return nil
}
func (b *Botanist) storePromtailRBACAuthToken(staticToken *secretutils.StaticToken) error {
promtailRBACAuthToken, err := staticToken.GetTokenForUsername(logging.PromtailRBACName)
if err != nil {
return err
}
b.PromtailRBACAuthToken = promtailRBACAuthToken.Token
return nil
}
func getExpiredCerts(gardenerResourceDataList gardencorev1alpha1helper.GardenerResourceDataList, renewalWindow time.Duration, secretNames ...string) ([]string, error) {
var expiredCerts []string
for _, secretName := range secretNames {
data := gardenerResourceDataList.Get(secretName)
if data == nil {
continue
}
certObj := &secretutils.CertificateJSONData{}
if err := json.Unmarshal(data.Data.Raw, certObj); err != nil {
return nil, err
}
expired, err := secretutils.CertificateIsExpired(certObj.Certificate, renewalWindow)
if err != nil {
return nil, err
}
if expired {
expiredCerts = append(expiredCerts, secretName)
}
}
return expiredCerts, nil
}
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 := gutil.GetAPIServerDomain(b.Shoot.InternalClusterDomain)
if b.Shoot.ExternalClusterDomain != nil {
kubecfgURL = gutil.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: gutil.ShootProjectSecretSuffixKubeconfig,
annotations: map[string]string{"url": "https://" + kubecfgURL},
labels: map[string]string{v1beta1constants.GardenRole: v1beta1constants.GardenRoleKubeconfig},
},
{
secretName: v1beta1constants.SecretNameSSHKeyPair,
suffix: gutil.ShootProjectSecretSuffixSSHKeypair,
labels: map[string]string{v1beta1constants.GardenRole: v1beta1constants.GardenRoleSSHKeyPair},
},
{
secretName: v1beta1constants.SecretNameOldSSHKeyPair,
suffix: gutil.ShootProjectSecretSuffixOldSSHKeypair,
labels: map[string]string{v1beta1constants.GardenRole: v1beta1constants.GardenRoleSSHKeyPair},
},
{
secretName: "monitoring-ingress-credentials-users",
suffix: gutil.ShootProjectSecretSuffixMonitoring,
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: gutil.ComputeShootProjectSecretName(b.Shoot.GetInfo().Name, s.suffix),
Namespace: b.Shoot.GetInfo().Namespace,
},
}
_, err := controllerutils.GetAndCreateOrStrategicMergePatch(ctx, b.K8sGardenClient.Client(), secretObj, func() error {
secretObj.OwnerReferences = []metav1.OwnerReference{
*metav1.NewControllerRef(b.Shoot.GetInfo(), gardencorev1beta1.SchemeGroupVersion.WithKind("Shoot")),
}
secretObj.Annotations = s.annotations
secretObj.Labels = s.labels
secretObj.Type = corev1.SecretTypeOpaque
secretObj.Data = b.LoadSecret(s.secretName).Data
return nil
})
return err
})
}
return flow.Parallel(fns...)(ctx)
}
func (b *Botanist) cleanupSecrets(ctx context.Context, gardenerResourceDataList *gardencorev1alpha1helper.GardenerResourceDataList, secretNames ...string) error {
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
}