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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 (
"bytes"
"context"
"fmt"
"net"
"os/exec"
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/features"
gardenletfeatures "github.com/gardener/gardener/pkg/gardenlet/features"
"github.com/gardener/gardener/pkg/operation/common"
"github.com/gardener/gardener/pkg/operation/seed"
kutil "github.com/gardener/gardener/pkg/utils/kubernetes"
"github.com/gardener/gardener/pkg/utils/secrets"
corev1 "k8s.io/api/core/v1"
apierrors "k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/util/sets"
"k8s.io/apiserver/pkg/authentication/user"
"k8s.io/client-go/util/retry"
"sigs.k8s.io/controller-runtime/pkg/client"
"sigs.k8s.io/controller-runtime/pkg/controller/controllerutil"
)
var wantedCertificateAuthorities = map[string]*secrets.CertificateSecretConfig{
v1beta1constants.SecretNameCACluster: {
Name: v1beta1constants.SecretNameCACluster,
CommonName: "kubernetes",
CertType: secrets.CACert,
},
v1beta1constants.SecretNameCAETCD: {
Name: v1beta1constants.SecretNameCAETCD,
CommonName: "etcd",
CertType: secrets.CACert,
},
v1beta1constants.SecretNameCAFrontProxy: {
Name: v1beta1constants.SecretNameCAFrontProxy,
CommonName: "front-proxy",
CertType: secrets.CACert,
},
v1beta1constants.SecretNameCAKubelet: {
Name: v1beta1constants.SecretNameCAKubelet,
CommonName: "kubelet",
CertType: secrets.CACert,
},
v1beta1constants.SecretNameCAMetricsServer: {
Name: v1beta1constants.SecretNameCAMetricsServer,
CommonName: "metrics-server",
CertType: secrets.CACert,
},
}
const (
certificateETCDServer = "etcd-server-tls"
certificateETCDClient = "etcd-client-tls"
)
// generateWantedSecrets returns a list of Secret configuration objects satisfying the secret config intface,
// each containing their specific configuration for the creation of certificates (server/client), RSA key pairs, basic
// authentication credentials, etc.
func (b *Botanist) generateWantedSecrets(basicAuthAPIServer *secrets.BasicAuth, staticToken *secrets.StaticToken, certificateAuthorities map[string]*secrets.Certificate) ([]secrets.ConfigInterface, error) {
var (
apiServerIPAddresses = []net.IP{
net.ParseIP("127.0.0.1"),
b.Shoot.Networks.APIServer,
}
apiServerCertDNSNames = append([]string{
"kube-apiserver",
fmt.Sprintf("kube-apiserver.%s", b.Shoot.SeedNamespace),
fmt.Sprintf("kube-apiserver.%s.svc", b.Shoot.SeedNamespace),
common.GetAPIServerDomain(b.Shoot.InternalClusterDomain),
}, dnsNamesForService("kubernetes", "default")...)
kubeControllerManagerCertDNSNames = dnsNamesForService("kube-controller-manager", b.Shoot.SeedNamespace)
kubeSchedulerCertDNSNames = dnsNamesForService("kube-scheduler", b.Shoot.SeedNamespace)
etcdCertDNSNames = dnsNamesForEtcd(b.Shoot.SeedNamespace)
endUserCrtValidity = common.EndUserCrtValidity
)
if gardencorev1beta1helper.TaintsHave(b.Seed.Info.Spec.Taints, gardencorev1beta1.SeedTaintDisableDNS) {
if addr := net.ParseIP(b.APIServerAddress); addr != nil {
apiServerIPAddresses = append(apiServerIPAddresses, addr)
} else {
apiServerCertDNSNames = append(apiServerCertDNSNames, b.APIServerAddress)
}
}
if len(certificateAuthorities) != len(wantedCertificateAuthorities) {
return nil, fmt.Errorf("missing certificate authorities")
}
if b.Shoot.ExternalClusterDomain != nil {
apiServerCertDNSNames = append(apiServerCertDNSNames, *(b.Shoot.Info.Spec.DNS.Domain), common.GetAPIServerDomain(*b.Shoot.ExternalClusterDomain))
}
secretList := []secrets.ConfigInterface{
// Secret definition for kube-apiserver
&secrets.ControlPlaneSecretConfig{
CertificateSecretConfig: &secrets.CertificateSecretConfig{
Name: "kube-apiserver",
CommonName: user.APIServerUser,
Organization: nil,
DNSNames: apiServerCertDNSNames,
IPAddresses: apiServerIPAddresses,
CertType: secrets.ServerCert,
SigningCA: certificateAuthorities[v1beta1constants.SecretNameCACluster],
},
},
// Secret definition for kube-apiserver to kubelets communication
&secrets.ControlPlaneSecretConfig{
CertificateSecretConfig: &secrets.CertificateSecretConfig{
Name: "kube-apiserver-kubelet",
CommonName: "system:kube-apiserver:kubelet",
Organization: nil,
DNSNames: nil,
IPAddresses: nil,
CertType: secrets.ClientCert,
SigningCA: certificateAuthorities[v1beta1constants.SecretNameCAKubelet],
},
},
// Secret definition for kube-aggregator
&secrets.ControlPlaneSecretConfig{
CertificateSecretConfig: &secrets.CertificateSecretConfig{
Name: "kube-aggregator",
CommonName: "system:kube-aggregator",
Organization: nil,
DNSNames: nil,
IPAddresses: nil,
CertType: secrets.ClientCert,
SigningCA: certificateAuthorities[v1beta1constants.SecretNameCAFrontProxy],
},
},
// Secret definition for kube-controller-manager
&secrets.ControlPlaneSecretConfig{
CertificateSecretConfig: &secrets.CertificateSecretConfig{
Name: "kube-controller-manager",
CommonName: user.KubeControllerManager,
Organization: nil,
DNSNames: nil,
IPAddresses: nil,
CertType: secrets.ClientCert,
SigningCA: certificateAuthorities[v1beta1constants.SecretNameCACluster],
},
KubeConfigRequest: &secrets.KubeConfigRequest{
ClusterName: b.Shoot.SeedNamespace,
APIServerURL: b.Shoot.ComputeInClusterAPIServerAddress(true),
},
},
// Secret definition for kube-controller-manager server
&secrets.ControlPlaneSecretConfig{
CertificateSecretConfig: &secrets.CertificateSecretConfig{
Name: common.KubeControllerManagerServerName,
CommonName: v1beta1constants.DeploymentNameKubeControllerManager,
Organization: nil,
DNSNames: kubeControllerManagerCertDNSNames,
IPAddresses: nil,
CertType: secrets.ServerCert,
SigningCA: certificateAuthorities[v1beta1constants.SecretNameCACluster],
},
},
// Secret definition for kube-scheduler
&secrets.ControlPlaneSecretConfig{
CertificateSecretConfig: &secrets.CertificateSecretConfig{
Name: "kube-scheduler",
CommonName: user.KubeScheduler,
Organization: nil,
DNSNames: nil,
IPAddresses: nil,
CertType: secrets.ClientCert,
SigningCA: certificateAuthorities[v1beta1constants.SecretNameCACluster],
},
KubeConfigRequest: &secrets.KubeConfigRequest{
ClusterName: b.Shoot.SeedNamespace,
APIServerURL: b.Shoot.ComputeInClusterAPIServerAddress(true),
},
},
// Secret definition for kube-scheduler server
&secrets.ControlPlaneSecretConfig{
CertificateSecretConfig: &secrets.CertificateSecretConfig{
Name: common.KubeSchedulerServerName,
CommonName: v1beta1constants.DeploymentNameKubeScheduler,
Organization: nil,
DNSNames: kubeSchedulerCertDNSNames,
IPAddresses: nil,
CertType: secrets.ServerCert,
SigningCA: certificateAuthorities[v1beta1constants.SecretNameCACluster],
},
},
// Secret definition for cluster-autoscaler
&secrets.ControlPlaneSecretConfig{
CertificateSecretConfig: &secrets.CertificateSecretConfig{
Name: v1beta1constants.DeploymentNameClusterAutoscaler,
CommonName: "system:cluster-autoscaler",
Organization: nil,
DNSNames: nil,
IPAddresses: nil,
CertType: secrets.ClientCert,
SigningCA: certificateAuthorities[v1beta1constants.SecretNameCACluster],
},
KubeConfigRequest: &secrets.KubeConfigRequest{
ClusterName: b.Shoot.SeedNamespace,
APIServerURL: b.Shoot.ComputeInClusterAPIServerAddress(true),
},
},
// Secret definition for gardener-resource-manager
&secrets.ControlPlaneSecretConfig{
CertificateSecretConfig: &secrets.CertificateSecretConfig{
Name: "gardener-resource-manager",
CommonName: "gardener.cloud:system:gardener-resource-manager",
Organization: []string{user.SystemPrivilegedGroup},
DNSNames: nil,
IPAddresses: nil,
CertType: secrets.ClientCert,
SigningCA: certificateAuthorities[v1beta1constants.SecretNameCACluster],
},
KubeConfigRequest: &secrets.KubeConfigRequest{
ClusterName: b.Shoot.SeedNamespace,
APIServerURL: b.Shoot.ComputeInClusterAPIServerAddress(true),
},
},
// Secret definition for kube-proxy
&secrets.ControlPlaneSecretConfig{
CertificateSecretConfig: &secrets.CertificateSecretConfig{
Name: "kube-proxy",
CommonName: user.KubeProxy,
Organization: nil,
DNSNames: nil,
IPAddresses: nil,
CertType: secrets.ClientCert,
SigningCA: certificateAuthorities[v1beta1constants.SecretNameCACluster],
},
KubeConfigRequest: &secrets.KubeConfigRequest{
ClusterName: b.Shoot.SeedNamespace,
APIServerURL: b.Shoot.ComputeOutOfClusterAPIServerAddress(b.APIServerAddress, true),
},
},
// Secret definition for kube-state-metrics
&secrets.ControlPlaneSecretConfig{
CertificateSecretConfig: &secrets.CertificateSecretConfig{
Name: "kube-state-metrics",
CommonName: "gardener.cloud:monitoring:kube-state-metrics",
Organization: []string{"gardener.cloud:monitoring"},
DNSNames: nil,
IPAddresses: nil,
CertType: secrets.ClientCert,
SigningCA: certificateAuthorities[v1beta1constants.SecretNameCACluster],
},
KubeConfigRequest: &secrets.KubeConfigRequest{
ClusterName: b.Shoot.SeedNamespace,
APIServerURL: b.Shoot.ComputeInClusterAPIServerAddress(true),
},
},
// Secret definition for prometheus
&secrets.ControlPlaneSecretConfig{
CertificateSecretConfig: &secrets.CertificateSecretConfig{
Name: "prometheus",
CommonName: "gardener.cloud:monitoring:prometheus",
Organization: []string{"gardener.cloud:monitoring"},
DNSNames: nil,
IPAddresses: nil,
CertType: secrets.ClientCert,
SigningCA: certificateAuthorities[v1beta1constants.SecretNameCACluster],
},
KubeConfigRequest: &secrets.KubeConfigRequest{
ClusterName: b.Shoot.SeedNamespace,
APIServerURL: b.Shoot.ComputeInClusterAPIServerAddress(true),
},
},
// Secret definition for prometheus to kubelets communication
&secrets.ControlPlaneSecretConfig{
CertificateSecretConfig: &secrets.CertificateSecretConfig{
Name: "prometheus-kubelet",
CommonName: "gardener.cloud:monitoring:prometheus",
Organization: []string{"gardener.cloud:monitoring"},
DNSNames: nil,
IPAddresses: nil,
CertType: secrets.ClientCert,
SigningCA: certificateAuthorities[v1beta1constants.SecretNameCAKubelet],
},
},
// Secret definition for gardener
&secrets.ControlPlaneSecretConfig{
CertificateSecretConfig: &secrets.CertificateSecretConfig{
Name: v1beta1constants.SecretNameGardener,
CommonName: gardencorev1beta1.GardenerName,
Organization: []string{user.SystemPrivilegedGroup},
DNSNames: nil,
IPAddresses: nil,
CertType: secrets.ClientCert,
SigningCA: certificateAuthorities[v1beta1constants.SecretNameCACluster],
},
KubeConfigRequest: &secrets.KubeConfigRequest{
ClusterName: b.Shoot.SeedNamespace,
APIServerURL: b.Shoot.ComputeOutOfClusterAPIServerAddress(b.APIServerAddress, true),
},
},
&secrets.ControlPlaneSecretConfig{
CertificateSecretConfig: &secrets.CertificateSecretConfig{
Name: v1beta1constants.SecretNameGardenerInternal,
CommonName: gardencorev1beta1.GardenerName,
Organization: []string{user.SystemPrivilegedGroup},
DNSNames: nil,
IPAddresses: nil,
CertType: secrets.ClientCert,
SigningCA: certificateAuthorities[v1beta1constants.SecretNameCACluster],
},
KubeConfigRequest: &secrets.KubeConfigRequest{
ClusterName: b.Shoot.SeedNamespace,
APIServerURL: b.Shoot.ComputeInClusterAPIServerAddress(false),
},
},
// Secret definition for cloud-config-downloader
&secrets.ControlPlaneSecretConfig{
CertificateSecretConfig: &secrets.CertificateSecretConfig{
Name: "cloud-config-downloader",
CommonName: "cloud-config-downloader",
Organization: nil,
DNSNames: nil,
IPAddresses: nil,
CertType: secrets.ClientCert,
SigningCA: certificateAuthorities[v1beta1constants.SecretNameCACluster],
},
KubeConfigRequest: &secrets.KubeConfigRequest{
ClusterName: b.Shoot.SeedNamespace,
APIServerURL: b.Shoot.ComputeOutOfClusterAPIServerAddress(b.APIServerAddress, true),
},
},
// Secret definition for monitoring
&secrets.BasicAuthSecretConfig{
Name: "monitoring-ingress-credentials",
Format: secrets.BasicAuthFormatNormal,
Username: "admin",
PasswordLength: 32,
},
// Secret definition for monitoring for shoot owners
&secrets.BasicAuthSecretConfig{
Name: "monitoring-ingress-credentials-users",
Format: secrets.BasicAuthFormatNormal,
Username: "admin",
PasswordLength: 32,
},
// Secret definition for ssh-keypair
&secrets.RSASecretConfig{
Name: v1beta1constants.SecretNameSSHKeyPair,
Bits: 4096,
UsedForSSH: true,
},
// Secret definition for service-account-key
&secrets.RSASecretConfig{
Name: "service-account-key",
Bits: 4096,
UsedForSSH: false,
},
// Secret definition for vpn-shoot (OpenVPN server side)
&secrets.CertificateSecretConfig{
Name: "vpn-shoot",
CommonName: "vpn-shoot",
Organization: nil,
DNSNames: []string{},
IPAddresses: []net.IP{},
CertType: secrets.ServerCert,
SigningCA: certificateAuthorities[v1beta1constants.SecretNameCACluster],
},
// Secret definition for vpn-seed (OpenVPN client side)
&secrets.CertificateSecretConfig{
Name: "vpn-seed",
CommonName: "vpn-seed",
Organization: nil,
DNSNames: []string{},
IPAddresses: []net.IP{},
CertType: secrets.ClientCert,
SigningCA: certificateAuthorities[v1beta1constants.SecretNameCACluster],
},
// Secret definition for etcd server
&secrets.CertificateSecretConfig{
Name: certificateETCDServer,
CommonName: "etcd-server",
Organization: nil,
DNSNames: etcdCertDNSNames,
IPAddresses: nil,
CertType: secrets.ServerClientCert,
SigningCA: certificateAuthorities[v1beta1constants.SecretNameCAETCD],
},
// Secret definition for etcd server
&secrets.CertificateSecretConfig{
Name: certificateETCDClient,
CommonName: "etcd-client",
Organization: nil,
DNSNames: nil,
IPAddresses: nil,
CertType: secrets.ClientCert,
SigningCA: certificateAuthorities[v1beta1constants.SecretNameCAETCD],
},
// Secret definition for metrics-server
&secrets.CertificateSecretConfig{
Name: "metrics-server",
CommonName: "metrics-server",
Organization: nil,
DNSNames: []string{
"metrics-server",
fmt.Sprintf("metrics-server.%s", metav1.NamespaceSystem),
fmt.Sprintf("metrics-server.%s.svc", metav1.NamespaceSystem),
},
IPAddresses: nil,
CertType: secrets.ServerClientCert,
SigningCA: certificateAuthorities[v1beta1constants.SecretNameCAMetricsServer],
},
// Secret definition for alertmanager (ingress)
&secrets.CertificateSecretConfig{
Name: common.AlertManagerTLS,
CommonName: "alertmanager",
Organization: []string{"gardener.cloud:monitoring:ingress"},
DNSNames: b.ComputeAlertManagerHosts(),
IPAddresses: nil,
CertType: secrets.ServerCert,
SigningCA: certificateAuthorities[v1beta1constants.SecretNameCACluster],
Validity: &endUserCrtValidity,
},
// Secret definition for grafana (ingress)
&secrets.CertificateSecretConfig{
Name: common.GrafanaTLS,
CommonName: "grafana",
Organization: []string{"gardener.cloud:monitoring:ingress"},
DNSNames: b.ComputeGrafanaHosts(),
IPAddresses: nil,
CertType: secrets.ServerCert,
SigningCA: certificateAuthorities[v1beta1constants.SecretNameCACluster],
Validity: &endUserCrtValidity,
},
// Secret definition for prometheus (ingress)
&secrets.CertificateSecretConfig{
Name: common.PrometheusTLS,
CommonName: "prometheus",
Organization: []string{"gardener.cloud:monitoring:ingress"},
DNSNames: b.ComputePrometheusHosts(),
IPAddresses: nil,
CertType: secrets.ServerCert,
SigningCA: certificateAuthorities[v1beta1constants.SecretNameCACluster],
Validity: &endUserCrtValidity,
},
}
// Secret definition for kubecfg
kubecfgToken, err := staticToken.GetTokenForUsername(common.KubecfgUsername)
if err != nil {
return nil, err
}
secretList = append(secretList, &secrets.ControlPlaneSecretConfig{
CertificateSecretConfig: &secrets.CertificateSecretConfig{
Name: common.KubecfgSecretName,
SigningCA: certificateAuthorities[v1beta1constants.SecretNameCACluster],
},
BasicAuth: basicAuthAPIServer,
Token: kubecfgToken,
KubeConfigRequest: &secrets.KubeConfigRequest{
ClusterName: b.Shoot.SeedNamespace,
APIServerURL: b.Shoot.ComputeOutOfClusterAPIServerAddress(b.APIServerAddress, false),
},
})
// Secret definition for dependency-watchdog-internal-probe
secretList = append(secretList, &secrets.ControlPlaneSecretConfig{
CertificateSecretConfig: &secrets.CertificateSecretConfig{
Name: common.DependencyWatchdogInternalProbeSecretName,
CommonName: common.DependencyWatchdogUserName,
Organization: nil,
DNSNames: nil,
IPAddresses: nil,
CertType: secrets.ClientCert,
SigningCA: certificateAuthorities[v1beta1constants.SecretNameCACluster],
},
KubeConfigRequest: &secrets.KubeConfigRequest{
ClusterName: b.Shoot.SeedNamespace,
APIServerURL: b.Shoot.ComputeInClusterAPIServerAddress(false),
},
})
// Secret definition for dependency-watchdog-external-probe
secretList = append(secretList, &secrets.ControlPlaneSecretConfig{
CertificateSecretConfig: &secrets.CertificateSecretConfig{
Name: common.DependencyWatchdogExternalProbeSecretName,
CommonName: common.DependencyWatchdogUserName,
Organization: nil,
DNSNames: nil,
IPAddresses: nil,
CertType: secrets.ClientCert,
SigningCA: certificateAuthorities[v1beta1constants.SecretNameCACluster],
},
KubeConfigRequest: &secrets.KubeConfigRequest{
ClusterName: b.Shoot.SeedNamespace,
APIServerURL: b.Shoot.ComputeOutOfClusterAPIServerAddress(b.APIServerAddress, true),
},
})
loggingEnabled := gardenletfeatures.FeatureGate.Enabled(features.Logging)
if loggingEnabled {
elasticsearchHosts := []string{"elasticsearch-logging",
fmt.Sprintf("elasticsearch-logging.%s", b.Shoot.SeedNamespace),
fmt.Sprintf("elasticsearch-logging.%s.svc", b.Shoot.SeedNamespace),
}
secretList = append(secretList,
&secrets.CertificateSecretConfig{
Name: common.KibanaTLS,
CommonName: "kibana",
Organization: []string{"gardener.cloud:logging:ingress"},
DNSNames: b.ComputeKibanaHosts(),
IPAddresses: nil,
CertType: secrets.ServerCert,
SigningCA: certificateAuthorities[v1beta1constants.SecretNameCACluster],
Validity: &endUserCrtValidity,
},
// Secret for elasticsearch
&secrets.CertificateSecretConfig{
Name: "elasticsearch-logging-server",
CommonName: "elasticsearch",
Organization: nil,
DNSNames: elasticsearchHosts,
IPAddresses: nil,
CertType: secrets.ServerClientCert,
SigningCA: certificateAuthorities[v1beta1constants.SecretNameCACluster],
PKCS: secrets.PKCS8,
},
// Secret definition for logging
&secrets.BasicAuthSecretConfig{
Name: "logging-ingress-credentials-users",
Format: secrets.BasicAuthFormatNormal,
Username: "user",
PasswordLength: 32,
BcryptPasswordHashRequest: true,
},
&secrets.BasicAuthSecretConfig{
Name: "logging-ingress-credentials",
Format: secrets.BasicAuthFormatNormal,
Username: "admin",
PasswordLength: 32,
BcryptPasswordHashRequest: true,
},
&secrets.CertificateSecretConfig{
Name: "sg-admin-client",
CommonName: "elasticsearch-logging",
Organization: nil,
DNSNames: elasticsearchHosts,
IPAddresses: nil,
CertType: secrets.ClientCert,
SigningCA: certificateAuthorities[v1beta1constants.SecretNameCACluster],
PKCS: secrets.PKCS8,
},
&secrets.BasicAuthSecretConfig{
Name: "kibana-logging-sg-credentials",
Format: secrets.BasicAuthFormatNormal,
Username: "kibanaserver",
PasswordLength: 32,
BcryptPasswordHashRequest: true,
},
&secrets.BasicAuthSecretConfig{
Name: "curator-sg-credentials",
Format: secrets.BasicAuthFormatNormal,
Username: "curator",
PasswordLength: 32,
BcryptPasswordHashRequest: true,
},
&secrets.BasicAuthSecretConfig{
Name: "admin-sg-credentials",
Format: secrets.BasicAuthFormatNormal,
Username: "admin",
PasswordLength: 32,
BcryptPasswordHashRequest: true,
},
)
}
return secretList, nil
}
// DeploySecrets 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) DeploySecrets(ctx context.Context) error {
// If the rotate-kubeconfig operation annotation is set then we delete the existing kubecfg and basic-auth
// secrets. This will trigger the regeneration, incorporating new credentials. After successful deletion of all
// old secrets we remove the operation annotation.
if val, ok := common.GetShootOperationAnnotation(b.Shoot.Info.Annotations); ok && val == common.ShootOperationRotateKubeconfigCredentials {
b.Logger.Infof("Rotating kubeconfig credentials")
for _, secretName := range []string{common.StaticTokenSecretName, 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
}
}
if _, err := kutil.TryUpdateShootAnnotations(b.K8sGardenClient.GardenCore(), retry.DefaultRetry, b.Shoot.Info.ObjectMeta, func(shoot *gardencorev1beta1.Shoot) (*gardencorev1beta1.Shoot, error) {
delete(shoot.Annotations, v1beta1constants.GardenerOperation)
delete(shoot.Annotations, common.ShootOperationDeprecated)
return shoot, nil
}); err != nil {
return err
}
}
// Basic authentication can be enabled or disabled. In both cases we have to check whether the basic auth secret in the shoot
// namespace in the seed exists because we might need to regenerate the end-users kubecfg that is used to communicate with the
// shoot cluster. If basic auth is enabled then we want to store the credentials inside the kubeconfig, if it's disabled then
// we want to remove old credentials out of it.
// Thus, if the basic-auth secret is not found and basic auth is disabled then we don't need to refresh anything. If it's found
// then we have to delete it and refresh the kubecfg (which is triggered by deleting the kubecfg secret). The other cases are
// the opposite: Basic auth is enabled and basic-auth secret found: no deletion required. If the secret is not found then we
// generate a new one and want to refresh the kubecfg.
mustDeleteUserCredentialSecrets := !gardencorev1beta1helper.ShootWantsBasicAuthentication(b.Shoot.Info)
basicAuthSecret := &corev1.Secret{}
if err := b.K8sSeedClient.Client().Get(ctx, kutil.Key(b.Shoot.SeedNamespace, common.BasicAuthSecretName), basicAuthSecret); err != nil {
if !apierrors.IsNotFound(err) {
return err
}
mustDeleteUserCredentialSecrets = gardencorev1beta1helper.ShootWantsBasicAuthentication(b.Shoot.Info)
}
if mustDeleteUserCredentialSecrets {
if err := b.K8sSeedClient.Client().Delete(ctx, &corev1.Secret{ObjectMeta: metav1.ObjectMeta{Name: common.BasicAuthSecretName, Namespace: b.Shoot.SeedNamespace}}); client.IgnoreNotFound(err) != nil {
return err
}
if err := b.K8sSeedClient.Client().Delete(ctx, &corev1.Secret{ObjectMeta: metav1.ObjectMeta{Name: common.KubecfgSecretName, Namespace: b.Shoot.SeedNamespace}}); client.IgnoreNotFound(err) != nil {
return err
}
}
// The kubeconfig secrets for the dependency-watchdog probes have now stopped using token to avoid the need for reconciliation
// on rotation. The old secrets containing tokens must be removed so that new secrets without token can be generated.
for _, secretName := range []string{common.DependencyWatchdogInternalProbeSecretName, common.DependencyWatchdogExternalProbeSecretName} {
secret := &corev1.Secret{}
if err := b.K8sSeedClient.Client().Get(ctx, kutil.Key(b.Shoot.SeedNamespace, secretName), secret); err != nil {
if apierrors.IsNotFound(err) {
continue
}
return err
}
if _, ok := secret.Data[secrets.DataKeyToken]; ok {
// The kubeconfig uses bearer token. Delete it to regenerate the new kubeconfig without bearer token.
if err := b.K8sSeedClient.Client().Delete(ctx, secret); client.IgnoreNotFound(err) != nil {
return err
}
}
// The kubeconfig does not use bearer token. No change required.
}
existingSecretsMap, err := b.fetchExistingSecrets(ctx)
if err != nil {
return err
}
certificateAuthorities, err := b.generateCertificateAuthorities(existingSecretsMap)
if err != nil {
return err
}
var basicAuthAPIServer *secrets.BasicAuth
if gardencorev1beta1helper.ShootWantsBasicAuthentication(b.Shoot.Info) {
basicAuthAPIServer, err = b.generateBasicAuthAPIServer(ctx, existingSecretsMap)
if err != nil {
return err
}
}
staticToken, err := b.generateStaticToken(ctx, existingSecretsMap)
if err != nil {
return err
}
if err := b.deployOpenVPNTLSAuthSecret(ctx, existingSecretsMap); err != nil {
return err
}
wantedSecretsList, err := b.generateWantedSecrets(basicAuthAPIServer, staticToken, certificateAuthorities)
if err != nil {
return err
}
// Only necessary to renew certificates for Alertmanager, Grafana, Kibana, Prometheus
// TODO: (timuthy) remove in future version.
var (
oldRenewedLabel = "cert.gardener.cloud/renewed"
renewedLabel = "cert.gardener.cloud/renewed-endpoint"
browserCerts = sets.NewString(common.GrafanaTLS, common.KibanaTLS, common.PrometheusTLS, common.AlertManagerTLS)
)
for name, secret := range existingSecretsMap {
_, ok := secret.Labels[renewedLabel]
if browserCerts.Has(name) && !ok {
if err := b.K8sSeedClient.Client().Delete(ctx, secret); client.IgnoreNotFound(err) != nil {
return err
}
delete(existingSecretsMap, name)
}
}
if err := b.generateShootSecrets(ctx, existingSecretsMap, wantedSecretsList); err != nil {
return err
}
// Only necessary to renew certificates for Alertmanager, Grafana, Kibana, Prometheus
// TODO: (timuthy) remove in future version.
for name, secret := range b.Secrets {
_, ok := secret.Labels[renewedLabel]
if browserCerts.Has(name) && !ok {
if secret.Labels == nil {
secret.Labels = make(map[string]string)
}
delete(secret.Labels, oldRenewedLabel)
secret.Labels[renewedLabel] = "true"
if err := b.K8sSeedClient.Client().Update(ctx, secret); err != nil {
return err
}
}
}
b.mutex.Lock()
defer b.mutex.Unlock()
for name, secret := range b.Secrets {
b.CheckSums[name] = common.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 = common.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) generateCertificateAuthorities(existingSecretsMap map[string]*corev1.Secret) (map[string]*secrets.Certificate, error) {
generatedSecrets, certificateAuthorities, err := secrets.GenerateCertificateAuthorities(b.K8sSeedClient, existingSecretsMap, wantedCertificateAuthorities, b.Shoot.SeedNamespace)
if err != nil {
return nil, err
}
b.mutex.Lock()
defer b.mutex.Unlock()
for secretName, caSecret := range generatedSecrets {
b.Secrets[secretName] = caSecret
}
return certificateAuthorities, nil
}
func (b *Botanist) generateBasicAuthAPIServer(ctx context.Context, existingSecretsMap map[string]*corev1.Secret) (*secrets.BasicAuth, error) {
basicAuthSecretAPIServer := &secrets.BasicAuthSecretConfig{
Name: common.BasicAuthSecretName,
Format: secrets.BasicAuthFormatCSV,
Username: "admin",
PasswordLength: 32,
}
if existingSecret, ok := existingSecretsMap[basicAuthSecretAPIServer.Name]; ok {
basicAuth, err := secrets.LoadBasicAuthFromCSV(basicAuthSecretAPIServer.Name, existingSecret.Data[secrets.DataKeyCSV])
if err != nil {
return nil, err
}
b.mutex.Lock()
defer b.mutex.Unlock()
b.Secrets[basicAuthSecretAPIServer.Name] = existingSecret
return basicAuth, nil
}
basicAuth, err := basicAuthSecretAPIServer.Generate()
if err != nil {
return nil, err
}
secret := &corev1.Secret{
ObjectMeta: metav1.ObjectMeta{
Name: basicAuthSecretAPIServer.Name,
Namespace: b.Shoot.SeedNamespace,
},
Type: corev1.SecretTypeOpaque,
Data: basicAuth.SecretData(),
}
if err := b.K8sSeedClient.Client().Create(ctx, secret); err != nil {
return nil, err
}
b.mutex.Lock()
defer b.mutex.Unlock()
b.Secrets[basicAuthSecretAPIServer.Name] = secret
return basicAuth.(*secrets.BasicAuth), nil
}
func (b *Botanist) generateStaticToken(ctx context.Context, existingSecretsMap map[string]*corev1.Secret) (*secrets.StaticToken, error) {
staticTokenConfig := &secrets.StaticTokenSecretConfig{
Name: common.StaticTokenSecretName,
Tokens: []secrets.TokenConfig{
{
Username: common.KubecfgUsername,
UserID: common.KubecfgUsername,
Groups: []string{user.SystemPrivilegedGroup},
},
{
Username: common.KubeAPIServerHealthCheck,
UserID: common.KubeAPIServerHealthCheck,
},
},
}