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ensure.go
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ensure.go
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package certs
import (
"context"
"errors"
"fmt"
"io/fs"
"os"
"path/filepath"
"slices"
"strings"
"github.com/loft-sh/vcluster/pkg/config"
"golang.org/x/exp/maps"
corev1 "k8s.io/api/core/v1"
kerrors "k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/client-go/kubernetes"
clientcmdapi "k8s.io/client-go/tools/clientcmd/api"
clientcmdlatest "k8s.io/client-go/tools/clientcmd/api/latest"
"k8s.io/klog/v2"
)
func EnsureCerts(
ctx context.Context,
serviceCIDR string,
currentNamespace string,
currentNamespaceClient kubernetes.Interface,
vClusterName string,
certificateDir string,
etcdSans []string,
options *config.VirtualClusterConfig,
) error {
if currentNamespaceClient == nil {
return errors.New("nil currentNamespaceClient")
}
// we create a certificate for up to 20 etcd replicas, this should be sufficient for most use cases. Eventually we probably
// want to update this to the actual etcd number, but for now this is the easiest way to allow up and downscaling without
// regenerating certificates.
secretName := vClusterName + "-certs"
secret, err := currentNamespaceClient.CoreV1().Secrets(currentNamespace).Get(ctx, secretName, metav1.GetOptions{})
if err == nil {
// download certs from secret
err = downloadCertsFromSecret(secret, certificateDir)
if err != nil {
return err
}
// update kube config
shouldUpdate, err := updateKubeconfigInSecret(secret)
if err != nil {
return err
} else if !shouldUpdate {
return nil
}
// delete the certs and recreate them
klog.Info("removing outdated certs")
cfg, err := createConfig(serviceCIDR, vClusterName, certificateDir, options.Networking.Advanced.ClusterDomain, etcdSans)
if err != nil {
return err
}
err = os.Remove(filepath.Join(certificateDir, "apiserver.crt"))
if err != nil && !errors.Is(err, fs.ErrNotExist) {
return err
}
err = os.Remove(filepath.Join(certificateDir, "apiserver.key"))
if err != nil && !errors.Is(err, fs.ErrNotExist) {
return err
}
// only create the files if the files are not there yet
err = CreatePKIAssets(cfg)
if err != nil {
// ignore the error because some other certs are upsetting the function
klog.V(1).Info("create pki assets err:", err)
}
cert, err := os.ReadFile(filepath.Join(certificateDir, "apiserver.crt"))
if err != nil {
return err
}
key, err := os.ReadFile(filepath.Join(certificateDir, "apiserver.key"))
if err != nil {
return err
}
secret.Data["apiserver.crt"] = cert
secret.Data["apiserver.key"] = key
_, err = currentNamespaceClient.CoreV1().Secrets(currentNamespace).Update(ctx, secret, metav1.UpdateOptions{})
if err != nil {
return err
}
return downloadCertsFromSecret(secret, certificateDir)
}
// we check if the files are already there
_, err = os.Stat(filepath.Join(certificateDir, CAKeyName))
if errors.Is(err, fs.ErrNotExist) {
// try to generate the certificates
err = generateCertificates(serviceCIDR, vClusterName, certificateDir, options.Networking.Advanced.ClusterDomain, etcdSans)
if err != nil {
return err
}
}
ownerRef := []metav1.OwnerReference{}
if options.Experimental.SyncSettings.SetOwner {
controlPlaneService, err := currentNamespaceClient.CoreV1().Services(currentNamespace).Get(ctx, options.ControlPlaneService, metav1.GetOptions{})
if err != nil {
return fmt.Errorf("get vcluster service: %w", err)
}
// client doesn't populate typemeta
controlPlaneService.APIVersion = "v1"
controlPlaneService.Kind = "Service"
ownerRef = append(ownerRef, metav1.OwnerReference{
APIVersion: "v1",
Kind: "Service",
Name: controlPlaneService.Name,
UID: controlPlaneService.UID,
})
}
// build secret
secret = &corev1.Secret{
ObjectMeta: metav1.ObjectMeta{
Name: secretName,
Namespace: currentNamespace,
OwnerReferences: ownerRef,
},
Data: map[string][]byte{},
}
for fromName, toName := range certMap {
data, err := os.ReadFile(filepath.Join(certificateDir, fromName))
if err != nil {
return fmt.Errorf("read %s: %w", fromName, err)
}
secret.Data[toName] = data
}
// find extra files in the folder and add them to the secret
extraFiles, err := extraFiles(certificateDir)
if err != nil {
return fmt.Errorf("read extra file: %w", err)
}
for k, v := range extraFiles {
secret.Data[k] = v
}
// finally create the secret
secret, err = currentNamespaceClient.CoreV1().Secrets(currentNamespace).Create(ctx, secret, metav1.CreateOptions{})
if err != nil {
if !kerrors.IsAlreadyExists(err) {
return fmt.Errorf("create certs secret: %w", err)
}
// get secret
secret, err = currentNamespaceClient.CoreV1().Secrets(currentNamespace).Get(ctx, secretName, metav1.GetOptions{})
if err != nil {
return fmt.Errorf("retrieve certs secret: %w", err)
}
} else {
klog.Infof("Successfully created certs secret %s/%s", currentNamespace, secretName)
}
return downloadCertsFromSecret(secret, certificateDir)
}
func createConfig(serviceCIDR, vClusterName, certificateDir, clusterDomain string, etcdSans []string) (*InitConfiguration, error) {
// init config
cfg, err := SetInitDynamicDefaults()
if err != nil {
return nil, err
}
cfg.ClusterName = "kubernetes"
cfg.NodeRegistration.Name = vClusterName
cfg.Etcd.Local = &LocalEtcd{
ServerCertSANs: etcdSans,
PeerCertSANs: etcdSans,
}
cfg.Networking.ServiceSubnet = serviceCIDR
cfg.Networking.DNSDomain = clusterDomain
cfg.ControlPlaneEndpoint = "127.0.0.1:6443"
cfg.CertificatesDir = certificateDir
cfg.LocalAPIEndpoint.AdvertiseAddress = "0.0.0.0"
cfg.LocalAPIEndpoint.BindPort = 443
return cfg, nil
}
func generateCertificates(
serviceCIDR string,
vClusterName string,
certificateDir string,
clusterDomain string,
etcdSans []string,
) error {
// init config
cfg, err := createConfig(serviceCIDR, vClusterName, certificateDir, clusterDomain, etcdSans)
if err != nil {
return err
}
// only create the files if the files are not there yet
err = CreatePKIAssets(cfg)
if err != nil {
return fmt.Errorf("create pki assets: %w", err)
}
err = CreateJoinControlPlaneKubeConfigFiles(cfg.CertificatesDir, cfg)
if err != nil {
return fmt.Errorf("create kube configs: %w", err)
}
return nil
}
// downloadCertsFromSecret writes to the filesystem the content of each field in the secret
// if the field has an equivalent inside the certmap, we write with the corresponding name
// otherwise the file has the same name than the field
func downloadCertsFromSecret(
secret *corev1.Secret,
certificateDir string,
) error {
certMapValues := maps.Values(certMap)
for secretEntry, fileBytes := range secret.Data {
name := secretEntry
if slices.Contains(certMapValues, secretEntry) {
// we need to replace with the actual name
for key, sEntry := range certMap {
// guarranteed to evaluate to true at least once because of slices.contains
if sEntry == secretEntry {
if len(fileBytes) == 0 {
return fmt.Errorf("secret is missing %s", secretEntry)
}
name = key
break
}
}
}
name = filepath.Join(certificateDir, name)
err := os.MkdirAll(filepath.Dir(name), 0777)
if err != nil {
return fmt.Errorf("create directory %s", filepath.Dir(name))
}
err = os.WriteFile(name, fileBytes, 0666)
if err != nil {
return fmt.Errorf("write %s: %w", name, err)
}
}
return nil
}
func extraFiles(certificateDir string) (map[string][]byte, error) {
files := make(map[string][]byte)
entries, err := os.ReadDir(certificateDir)
if err != nil {
return nil, err
}
for _, v := range entries {
if v.IsDir() {
// ignore subdirectories for now
// etcd files should be picked up by the map
continue
}
// if it's not in the cert map, add to the map
name := v.Name()
_, ok := certMap[name]
if !ok {
b, err := os.ReadFile(filepath.Join(certificateDir, name))
if err != nil {
return nil, err
}
files[name] = b
}
}
return files, err
}
func updateKubeconfigToLocalhost(config *clientcmdapi.Config) bool {
updated := false
// not sure what that would do in case of multiple clusters,
// but this is not expected AFAIU
for k, v := range config.Clusters {
if v == nil {
continue
}
if v.Server != "https://127.0.0.1:6443" {
if config.Clusters[k] == nil {
config.Clusters[k] = &clientcmdapi.Cluster{}
}
config.Clusters[k].Server = "https://127.0.0.1:6443"
updated = true
}
}
return updated
}
func updateKubeconfigInSecret(secret *corev1.Secret) (shouldUpdate bool, err error) {
shouldUpdate = false
for k, v := range secret.Data {
if !strings.HasSuffix(k, ".conf") {
continue
}
config := &clientcmdapi.Config{}
err = runtime.DecodeInto(clientcmdlatest.Codec, v, config)
if err != nil {
return false, err
}
hasChanged := updateKubeconfigToLocalhost(config)
if !hasChanged {
continue
}
shouldUpdate = true
marshalled, err := runtime.Encode(clientcmdlatest.Codec, config)
if err != nil {
return false, err
}
secret.Data[k] = marshalled
}
return shouldUpdate, nil
}