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csr.go
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csr.go
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// SPDX-FileCopyrightText: 2024 SAP SE or an SAP affiliate company and Gardener contributors
//
// SPDX-License-Identifier: Apache-2.0
package access
import (
"context"
"crypto/rand"
"crypto/x509/pkix"
"time"
certificatesv1 "k8s.io/api/certificates/v1"
corev1 "k8s.io/api/core/v1"
rbacv1 "k8s.io/api/rbac/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/client-go/rest"
"k8s.io/client-go/util/cert"
csrutil "k8s.io/client-go/util/certificate/csr"
"k8s.io/utils/ptr"
"sigs.k8s.io/controller-runtime/pkg/client"
"github.com/gardener/gardener/pkg/client/kubernetes"
"github.com/gardener/gardener/pkg/controllerutils"
"github.com/gardener/gardener/pkg/utils"
"github.com/gardener/gardener/pkg/utils/flow"
secretsutils "github.com/gardener/gardener/pkg/utils/secrets"
)
// labelsE2ETestCSRAccess is the set of labels added to all CSRs and ClusterRoleBindings for easy cleanup.
var labelsE2ETestCSRAccess = map[string]string{"e2e-test": "csr-access"}
// CreateTargetClientFromCSR creates and approves a CSR in the shoot and creates a new target client from it.
// You should call CleanupObjectsFromCSRAccess to clean up the objects created by this function.
func CreateTargetClientFromCSR(ctx context.Context, targetClient kubernetes.Interface, commonName string) (kubernetes.Interface, error) {
// use fake key to avoid building complex retry/update logic
privateKey, err := secretsutils.FakeGenerateKey(rand.Reader, 4096)
if err != nil {
return nil, err
}
csrData, err := cert.MakeCSR(privateKey, &pkix.Name{CommonName: commonName}, nil, nil)
if err != nil {
return nil, err
}
reqName, reqUID, err := csrutil.RequestCertificate(
targetClient.Kubernetes(),
csrData,
commonName,
certificatesv1.KubeAPIServerClientSignerName,
ptr.To(3600*time.Second),
[]certificatesv1.KeyUsage{
certificatesv1.UsageDigitalSignature,
certificatesv1.UsageKeyEncipherment,
certificatesv1.UsageClientAuth,
},
privateKey,
)
if err != nil {
return nil, err
}
csr := &certificatesv1.CertificateSigningRequest{}
if err = targetClient.Client().Get(ctx, client.ObjectKey{Name: reqName}, csr); err != nil {
return nil, err
}
patch := client.MergeFrom(csr.DeepCopy())
csr.Labels = utils.MergeStringMaps(csr.Labels, labelsE2ETestCSRAccess)
if err = targetClient.Client().Patch(ctx, csr, patch); err != nil {
return nil, err
}
clusterRoleBinding := &rbacv1.ClusterRoleBinding{ObjectMeta: metav1.ObjectMeta{Name: commonName}}
if _, err = controllerutils.GetAndCreateOrMergePatch(ctx, targetClient.Client(), clusterRoleBinding, func() error {
clusterRoleBinding.Labels = utils.MergeStringMaps(clusterRoleBinding.Labels, labelsE2ETestCSRAccess)
clusterRoleBinding.RoleRef = rbacv1.RoleRef{
APIGroup: rbacv1.GroupName,
Kind: "ClusterRole",
Name: "cluster-admin",
}
clusterRoleBinding.Subjects = []rbacv1.Subject{{
Kind: rbacv1.UserKind,
Name: commonName,
}}
return nil
}); err != nil {
return nil, err
}
hasApprovedCondition := false
for _, condition := range csr.Status.Conditions {
if condition.Type == certificatesv1.CertificateApproved {
hasApprovedCondition = true
break
}
}
if !hasApprovedCondition {
csr.Status.Conditions = append(csr.Status.Conditions, certificatesv1.CertificateSigningRequestCondition{
Type: certificatesv1.CertificateApproved,
Reason: "AutoApproved",
Message: "Auto approving test CertificateSigningRequest",
Status: corev1.ConditionTrue,
})
if err := targetClient.Client().SubResource("approval").Update(ctx, csr); err != nil {
return nil, err
}
}
certData, err := csrutil.WaitForCertificate(ctx, targetClient.Kubernetes(), reqName, reqUID)
if err != nil {
return nil, err
}
r := targetClient.RESTConfig()
restConfig := &rest.Config{
Host: r.Host,
TLSClientConfig: rest.TLSClientConfig{
CAData: r.CAData,
CertData: certData,
KeyData: utils.EncodePrivateKey(privateKey),
},
}
return kubernetes.NewWithConfig(kubernetes.WithRESTConfig(restConfig), kubernetes.WithDisabledCachedClient())
}
// CleanupObjectsFromCSRAccess cleans up all objects in the target created by all calls to CreateTargetClientFromCSR.
func CleanupObjectsFromCSRAccess(ctx context.Context, targetClient kubernetes.Interface) error {
return flow.Parallel(func(ctx context.Context) error {
return targetClient.Client().DeleteAllOf(ctx, &certificatesv1.CertificateSigningRequest{}, client.MatchingLabels(labelsE2ETestCSRAccess))
}, func(ctx context.Context) error {
return targetClient.Client().DeleteAllOf(ctx, &rbacv1.ClusterRoleBinding{}, client.MatchingLabels(labelsE2ETestCSRAccess))
})(ctx)
}