/
admin_kubeconfig.go
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/
admin_kubeconfig.go
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/*
Copyright (c) 2021 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 storage
import (
"context"
"encoding/json"
"fmt"
"net/url"
"sort"
"strconv"
"time"
authenticationapi "github.com/gardener/gardener/pkg/apis/authentication"
authenticationapiv1alpha1 "github.com/gardener/gardener/pkg/apis/authentication/v1alpha1"
authenticationvalidation "github.com/gardener/gardener/pkg/apis/authentication/validation"
"github.com/gardener/gardener/pkg/apis/core"
gardencorev1alpha1 "github.com/gardener/gardener/pkg/apis/core/v1alpha1"
gardencorev1alpha1helper "github.com/gardener/gardener/pkg/apis/core/v1alpha1/helper"
v1beta1constants "github.com/gardener/gardener/pkg/apis/core/v1beta1/constants"
"github.com/gardener/gardener/pkg/client/kubernetes"
"github.com/gardener/gardener/pkg/utils"
"github.com/gardener/gardener/pkg/utils/secrets"
secretsmanager "github.com/gardener/gardener/pkg/utils/secrets/manager"
"k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/labels"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/runtime/schema"
"k8s.io/apimachinery/pkg/selection"
"k8s.io/apimachinery/pkg/util/validation/field"
"k8s.io/apiserver/pkg/authentication/user"
genericapirequest "k8s.io/apiserver/pkg/endpoints/request"
"k8s.io/apiserver/pkg/registry/rest"
)
// AdminKubeconfigREST implements a RESTStorage for shoots/adminkubeconfig.
type AdminKubeconfigREST struct {
shootStateStorage getter
shootStorage getter
maxExpirationSeconds int64
}
var (
_ = rest.NamedCreater(&AdminKubeconfigREST{})
_ = rest.GroupVersionKindProvider(&AdminKubeconfigREST{})
gvk = schema.GroupVersionKind{
Group: authenticationapiv1alpha1.SchemeGroupVersion.Group,
Version: authenticationapiv1alpha1.SchemeGroupVersion.Version,
Kind: "AdminKubeconfigRequest",
}
)
// New returns and instance of AdminKubeconfigRequest
func (r *AdminKubeconfigREST) New() runtime.Object {
return &authenticationapi.AdminKubeconfigRequest{}
}
// Create returns a AdminKubeconfigRequest with kubeconfig based on
// - shoot's advertised addresses
// - shoot's certificate authority
// - user making the request
func (r *AdminKubeconfigREST) Create(ctx context.Context, name string, obj runtime.Object, createValidation rest.ValidateObjectFunc, _ *metav1.CreateOptions) (runtime.Object, error) {
if createValidation != nil {
if err := createValidation(ctx, obj.DeepCopyObject()); err != nil {
return nil, err
}
}
out := obj.(*authenticationapi.AdminKubeconfigRequest)
if errs := authenticationvalidation.ValidateAdminKubeconfigRequest(out); len(errs) != 0 {
return nil, errors.NewInvalid(gvk.GroupKind(), "", errs)
}
userInfo, ok := genericapirequest.UserFrom(ctx)
if !ok {
return nil, errors.NewBadRequest("no user in context")
}
shootStateObj, err := r.shootStateStorage.Get(ctx, name, &metav1.GetOptions{})
if err != nil {
return nil, err
}
shootState := &gardencorev1alpha1.ShootState{}
if err := kubernetes.GardenScheme.Convert(shootStateObj, shootState, nil); err != nil {
return nil, err
}
shootObj, err := r.shootStorage.Get(ctx, name, &metav1.GetOptions{})
if err != nil {
return nil, err
}
shoot, ok := shootObj.(*core.Shoot)
if !ok {
return nil, errors.NewInternalError(fmt.Errorf("cannot convert to *core.Shoot object - got type %T", shootObj))
}
if len(shoot.Status.AdvertisedAddresses) == 0 {
fieldErr := field.Invalid(field.NewPath("status", "status"), shoot.Status.AdvertisedAddresses, "no kube-apiserver advertised addresses in Shoot .status.advertisedAddresses")
return nil, errors.NewInvalid(gvk.GroupKind(), shoot.Name, field.ErrorList{fieldErr})
}
resourceDataList := gardencorev1alpha1helper.GardenerResourceDataList(shootState.Spec.Gardener)
clusterCABundle, err := getClusterCABundle(resourceDataList)
if err != nil {
return nil, errors.NewInternalError(fmt.Errorf("could not find cluster CA bundle: %w", err))
}
clientCACertificate, err := getClientCACertificate(resourceDataList)
if err != nil {
return nil, errors.NewInternalError(fmt.Errorf("could not find client CA certificate: %w", err))
}
if r.maxExpirationSeconds > 0 && out.Spec.ExpirationSeconds > r.maxExpirationSeconds {
out.Spec.ExpirationSeconds = r.maxExpirationSeconds
}
var (
validity = time.Duration(out.Spec.ExpirationSeconds) * time.Second
authName = fmt.Sprintf("%s--%s", shoot.Namespace, shoot.Name)
cpsc = secrets.ControlPlaneSecretConfig{
Name: authName,
CertificateSecretConfig: &secrets.CertificateSecretConfig{
CommonName: userInfo.GetName(),
Organization: []string{user.SystemPrivilegedGroup},
CertType: secrets.ClientCert,
Validity: &validity,
SigningCA: clientCACertificate,
},
}
)
for _, address := range shoot.Status.AdvertisedAddresses {
u, err := url.Parse(address.URL)
if err != nil {
return nil, err
}
cpsc.KubeConfigRequests = append(cpsc.KubeConfigRequests, secrets.KubeConfigRequest{
ClusterName: fmt.Sprintf("%s-%s", authName, address.Name),
APIServerHost: u.Host,
CAData: clusterCABundle,
})
}
cp, err := cpsc.Generate()
if err != nil {
return nil, err
}
controlPlaneSecret := cp.(*secrets.ControlPlane)
out.Status.Kubeconfig = controlPlaneSecret.Kubeconfig
out.Status.ExpirationTimestamp = metav1.Time{Time: controlPlaneSecret.Certificate.Certificate.NotAfter}
return out, nil
}
// GroupVersionKind returns authentication.gardener.cloud/v1alpha1 for AdminKubeconfigRequest.
func (r *AdminKubeconfigREST) GroupVersionKind(schema.GroupVersion) schema.GroupVersionKind {
return gvk
}
type getter interface {
Get(ctx context.Context, name string, options *metav1.GetOptions) (runtime.Object, error)
}
var (
managedBySecretsManagerReq = utils.MustNewRequirement(secretsmanager.LabelKeyManagedBy, selection.Equals, secretsmanager.LabelValueSecretsManager)
identityGardenletReq = utils.MustNewRequirement(secretsmanager.LabelKeyManagerIdentity, selection.Equals, v1beta1constants.SecretManagerIdentityGardenlet)
nameCAClientReq = utils.MustNewRequirement(secretsmanager.LabelKeyName, selection.Equals, v1beta1constants.SecretNameCAClient)
nameCAClusterReq = utils.MustNewRequirement(secretsmanager.LabelKeyName, selection.Equals, v1beta1constants.SecretNameCACluster)
caCertificateSelector = labels.NewSelector().Add(managedBySecretsManagerReq).Add(identityGardenletReq)
)
func findNewestCACertificate(results []*gardencorev1alpha1.GardenerResourceData) (*gardencorev1alpha1.GardenerResourceData, error) {
if len(results) == 1 {
return results[0], nil
}
var (
newestIssuedAtTime int64
result *gardencorev1alpha1.GardenerResourceData
)
for _, data := range results {
issuedAtTime, ok := data.Labels[secretsmanager.LabelKeyIssuedAtTime]
if !ok {
continue
}
issuedAtUnix, err := strconv.ParseInt(issuedAtTime, 10, 64)
if err != nil {
return nil, err
}
if issuedAtUnix > newestIssuedAtTime {
newestIssuedAtTime = issuedAtUnix
result = data.DeepCopy()
}
}
return result, nil
}
func getClusterCABundle(resourceDataList gardencorev1alpha1helper.GardenerResourceDataList) ([]byte, error) {
var (
allCAs = resourceDataList.Select(caCertificateSelector.Add(nameCAClusterReq))
caBundle []byte
err error
)
// Sort CAs descending based on their issued-at-time label. This ensures that the current CA is always the first so
// that the order in the bundle is the same as in the <shoot-name>.ca-cluster secret.
sort.Slice(allCAs, func(i, j int) bool {
issuedAtUnix1, err1 := parseIssuedAtUnix(allCAs[i])
if err1 != nil {
err = err1
}
issuedAtUnix2, err2 := parseIssuedAtUnix(allCAs[j])
if err2 != nil {
err = err2
}
return issuedAtUnix1 > issuedAtUnix2
})
if err != nil {
return nil, err
}
for _, data := range allCAs {
cert, _, err := getCADataRaw(data)
if err != nil {
return nil, fmt.Errorf("could not fetch raw CA data for %q", data.Name)
}
caBundle = append(caBundle, cert...)
}
if len(caBundle) == 0 {
return nil, fmt.Errorf("cluster certificate authority not yet provisioned")
}
return caBundle, nil
}
func getClientCACertificate(resourceDataList gardencorev1alpha1helper.GardenerResourceDataList) (*secrets.Certificate, error) {
var (
ca *gardencorev1alpha1.GardenerResourceData
err error
)
if caCerts := resourceDataList.Select(caCertificateSelector.Add(nameCAClientReq)); len(caCerts) > 0 {
ca, err = findNewestCACertificate(caCerts)
if err != nil {
return nil, fmt.Errorf("could not find newest CA certificate for %s: %w", nameCAClientReq, err)
}
}
if ca == nil {
return nil, fmt.Errorf("client certificate authority not yet provisioned")
}
cert, key, err := getCADataRaw(ca)
if err != nil {
return nil, fmt.Errorf("could not fetch raw client CA data for %q", ca.Name)
}
return secrets.LoadCertificate("", key, cert)
}
func getCADataRaw(resourceData *gardencorev1alpha1.GardenerResourceData) (certificate []byte, privateKey []byte, err error) {
data := make(map[string][]byte)
if err = json.Unmarshal(resourceData.Data.Raw, &data); err != nil {
return nil, nil, err
}
certificate, privateKey = data[secrets.DataKeyCertificateCA], data[secrets.DataKeyPrivateKeyCA]
return
}
func parseIssuedAtUnix(caSecret *gardencorev1alpha1.GardenerResourceData) (int64, error) {
issuedAtTime, ok1 := caSecret.Labels[secretsmanager.LabelKeyIssuedAtTime]
if !ok1 {
return -1, fmt.Errorf("ca %q does not have %s label", caSecret.Name, secretsmanager.LabelKeyIssuedAtTime)
}
issuedAtUnix, err := strconv.ParseInt(issuedAtTime, 10, 64)
if err != nil {
return -1, fmt.Errorf("could not parse %s label for ca %q: %w", secretsmanager.LabelKeyIssuedAtTime, caSecret.Name, err)
}
return issuedAtUnix, nil
}