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certificates.go
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certificates.go
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package cluster
import (
"context"
"crypto/rsa"
"fmt"
"strings"
"time"
"github.com/rancher/rke/hosts"
"github.com/rancher/rke/k8s"
"github.com/rancher/rke/log"
"github.com/rancher/rke/pki"
"github.com/rancher/rke/services"
"github.com/sirupsen/logrus"
"golang.org/x/sync/errgroup"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/util/cert"
)
func SetUpAuthentication(ctx context.Context, kubeCluster, currentCluster *Cluster) error {
if kubeCluster.Authentication.Strategy == X509AuthenticationProvider {
var err error
if currentCluster != nil {
kubeCluster.Certificates = currentCluster.Certificates
// this is the case of handling upgrades for API server aggregation layer ca cert and API server proxy client key and cert
if kubeCluster.Certificates[pki.RequestHeaderCACertName].Certificate == nil {
kubeCluster.Certificates, err = regenerateAPIAggregationCerts(kubeCluster, kubeCluster.Certificates)
if err != nil {
return fmt.Errorf("Failed to regenerate Aggregation layer certificates %v", err)
}
}
} else {
var backupPlane string
var backupHosts []*hosts.Host
if len(kubeCluster.Services.Etcd.ExternalURLs) > 0 {
backupPlane = ControlPlane
backupHosts = kubeCluster.ControlPlaneHosts
} else {
// Save certificates on etcd and controlplane hosts
backupPlane = fmt.Sprintf("%s,%s", EtcdPlane, ControlPlane)
backupHosts = hosts.GetUniqueHostList(kubeCluster.EtcdHosts, kubeCluster.ControlPlaneHosts, nil)
}
log.Infof(ctx, "[certificates] Attempting to recover certificates from backup on [%s] hosts", backupPlane)
kubeCluster.Certificates, err = fetchBackupCertificates(ctx, backupHosts, kubeCluster)
if err != nil {
return err
}
if kubeCluster.Certificates != nil {
log.Infof(ctx, "[certificates] Certificate backup found on [%s] hosts", backupPlane)
// make sure I have all the etcd certs, We need handle dialer failure for etcd nodes https://github.com/rancher/rancher/issues/12898
for _, host := range kubeCluster.EtcdHosts {
certName := pki.GetEtcdCrtName(host.InternalAddress)
if kubeCluster.Certificates[certName].Certificate == nil {
if kubeCluster.Certificates, err = pki.RegenerateEtcdCertificate(ctx,
kubeCluster.Certificates,
host,
kubeCluster.EtcdHosts,
kubeCluster.ClusterDomain,
kubeCluster.KubernetesServiceIP); err != nil {
return err
}
}
}
// this is the case of adding controlplane node on empty cluster with only etcd nodes
if kubeCluster.Certificates[pki.KubeAdminCertName].Config == "" && len(kubeCluster.ControlPlaneHosts) > 0 {
if err := rebuildLocalAdminConfig(ctx, kubeCluster); err != nil {
return err
}
kubeCluster.Certificates, err = regenerateAPICertificate(kubeCluster, kubeCluster.Certificates)
if err != nil {
return fmt.Errorf("Failed to regenerate KubeAPI certificate %v", err)
}
}
// this is the case of handling upgrades for API server aggregation layer ca cert and API server proxy client key and cert
if kubeCluster.Certificates[pki.RequestHeaderCACertName].Certificate == nil {
kubeCluster.Certificates, err = regenerateAPIAggregationCerts(kubeCluster, kubeCluster.Certificates)
if err != nil {
return fmt.Errorf("Failed to regenerate Aggregation layer certificates %v", err)
}
}
return nil
}
log.Infof(ctx, "[certificates] No Certificate backup found on [%s] hosts", backupPlane)
kubeCluster.Certificates, err = pki.GenerateRKECerts(ctx, kubeCluster.RancherKubernetesEngineConfig, kubeCluster.LocalKubeConfigPath, "")
if err != nil {
return fmt.Errorf("Failed to generate Kubernetes certificates: %v", err)
}
log.Infof(ctx, "[certificates] Temporarily saving certs to [%s] hosts", backupPlane)
if err := deployBackupCertificates(ctx, backupHosts, kubeCluster); err != nil {
return err
}
log.Infof(ctx, "[certificates] Saved certs to [%s] hosts", backupPlane)
}
}
return nil
}
func regenerateAPICertificate(c *Cluster, certificates map[string]pki.CertificatePKI) (map[string]pki.CertificatePKI, error) {
logrus.Debugf("[certificates] Regenerating kubeAPI certificate")
kubeAPIAltNames := pki.GetAltNames(c.ControlPlaneHosts, c.ClusterDomain, c.KubernetesServiceIP, c.Authentication.SANs)
caCrt := certificates[pki.CACertName].Certificate
caKey := certificates[pki.CACertName].Key
kubeAPIKey := certificates[pki.KubeAPICertName].Key
kubeAPICert, _, err := pki.GenerateSignedCertAndKey(caCrt, caKey, true, pki.KubeAPICertName, kubeAPIAltNames, kubeAPIKey, nil)
if err != nil {
return nil, err
}
certificates[pki.KubeAPICertName] = pki.ToCertObject(pki.KubeAPICertName, "", "", kubeAPICert, kubeAPIKey)
return certificates, nil
}
func getClusterCerts(ctx context.Context, kubeClient *kubernetes.Clientset, etcdHosts []*hosts.Host) (map[string]pki.CertificatePKI, error) {
log.Infof(ctx, "[certificates] Getting Cluster certificates from Kubernetes")
certificatesNames := []string{
pki.CACertName,
pki.KubeAPICertName,
pki.KubeNodeCertName,
pki.KubeProxyCertName,
pki.KubeControllerCertName,
pki.KubeSchedulerCertName,
pki.KubeAdminCertName,
pki.APIProxyClientCertName,
pki.RequestHeaderCACertName,
}
for _, etcdHost := range etcdHosts {
etcdName := pki.GetEtcdCrtName(etcdHost.InternalAddress)
certificatesNames = append(certificatesNames, etcdName)
}
certMap := make(map[string]pki.CertificatePKI)
for _, certName := range certificatesNames {
secret, err := k8s.GetSecret(kubeClient, certName)
if err != nil && !strings.HasPrefix(certName, "kube-etcd") &&
!strings.Contains(certName, pki.RequestHeaderCACertName) &&
!strings.Contains(certName, pki.APIProxyClientCertName) {
return nil, err
}
// If I can't find an etcd, requestheader, or proxy client cert, I will not fail and will create it later.
if (secret == nil || secret.Data == nil) &&
(strings.HasPrefix(certName, "kube-etcd") ||
strings.Contains(certName, pki.RequestHeaderCACertName) ||
strings.Contains(certName, pki.APIProxyClientCertName)) {
certMap[certName] = pki.CertificatePKI{}
continue
}
secretCert, err := cert.ParseCertsPEM(secret.Data["Certificate"])
if err != nil {
return nil, fmt.Errorf("Failed to parse certificate of %s: %v", certName, err)
}
secretKey, err := cert.ParsePrivateKeyPEM(secret.Data["Key"])
if err != nil {
return nil, fmt.Errorf("Failed to parse private key of %s: %v", certName, err)
}
secretConfig := string(secret.Data["Config"])
if len(secretCert) == 0 || secretKey == nil {
return nil, fmt.Errorf("certificate or key of %s is not found", certName)
}
certMap[certName] = pki.CertificatePKI{
Certificate: secretCert[0],
Key: secretKey.(*rsa.PrivateKey),
Config: secretConfig,
EnvName: string(secret.Data["EnvName"]),
ConfigEnvName: string(secret.Data["ConfigEnvName"]),
KeyEnvName: string(secret.Data["KeyEnvName"]),
Path: string(secret.Data["Path"]),
KeyPath: string(secret.Data["KeyPath"]),
ConfigPath: string(secret.Data["ConfigPath"]),
}
}
log.Infof(ctx, "[certificates] Successfully fetched Cluster certificates from Kubernetes")
return certMap, nil
}
func saveClusterCerts(ctx context.Context, kubeClient *kubernetes.Clientset, crts map[string]pki.CertificatePKI) error {
log.Infof(ctx, "[certificates] Save kubernetes certificates as secrets")
var errgrp errgroup.Group
for crtName, crt := range crts {
name := crtName
certificate := crt
errgrp.Go(func() error {
return saveCertToKubernetes(kubeClient, name, certificate)
})
}
if err := errgrp.Wait(); err != nil {
return err
}
log.Infof(ctx, "[certificates] Successfully saved certificates as kubernetes secret [%s]", pki.CertificatesSecretName)
return nil
}
func saveCertToKubernetes(kubeClient *kubernetes.Clientset, crtName string, crt pki.CertificatePKI) error {
logrus.Debugf("[certificates] Saving certificate [%s] to kubernetes", crtName)
timeout := make(chan bool, 1)
// build secret Data
secretData := make(map[string][]byte)
if crt.Certificate != nil {
secretData["Certificate"] = cert.EncodeCertPEM(crt.Certificate)
secretData["EnvName"] = []byte(crt.EnvName)
secretData["Path"] = []byte(crt.Path)
}
if crt.Key != nil {
secretData["Key"] = cert.EncodePrivateKeyPEM(crt.Key)
secretData["KeyEnvName"] = []byte(crt.KeyEnvName)
secretData["KeyPath"] = []byte(crt.KeyPath)
}
if len(crt.Config) > 0 {
secretData["ConfigEnvName"] = []byte(crt.ConfigEnvName)
secretData["Config"] = []byte(crt.Config)
secretData["ConfigPath"] = []byte(crt.ConfigPath)
}
go func() {
for {
err := k8s.UpdateSecret(kubeClient, secretData, crtName)
if err != nil {
time.Sleep(time.Second * 5)
continue
}
timeout <- true
break
}
}()
select {
case <-timeout:
return nil
case <-time.After(time.Second * KubernetesClientTimeOut):
return fmt.Errorf("[certificates] Timeout waiting for kubernetes to be ready")
}
}
func deployBackupCertificates(ctx context.Context, backupHosts []*hosts.Host, kubeCluster *Cluster) error {
var errgrp errgroup.Group
for _, host := range backupHosts {
runHost := host
errgrp.Go(func() error {
return pki.DeployCertificatesOnHost(ctx, runHost, kubeCluster.Certificates, kubeCluster.SystemImages.CertDownloader, pki.TempCertPath, kubeCluster.PrivateRegistriesMap)
})
}
return errgrp.Wait()
}
func fetchBackupCertificates(ctx context.Context, backupHosts []*hosts.Host, kubeCluster *Cluster) (map[string]pki.CertificatePKI, error) {
var err error
certificates := map[string]pki.CertificatePKI{}
for _, host := range backupHosts {
certificates, err = pki.FetchCertificatesFromHost(ctx, kubeCluster.EtcdHosts, host, kubeCluster.SystemImages.Alpine, kubeCluster.LocalKubeConfigPath, kubeCluster.PrivateRegistriesMap)
if certificates != nil {
return certificates, nil
}
}
// reporting the last error only.
return nil, err
}
func fetchCertificatesFromEtcd(ctx context.Context, kubeCluster *Cluster) ([]byte, []byte, error) {
// Get kubernetes certificates from the etcd hosts
certificates := map[string]pki.CertificatePKI{}
var err error
for _, host := range kubeCluster.EtcdHosts {
certificates, err = pki.FetchCertificatesFromHost(ctx, kubeCluster.EtcdHosts, host, kubeCluster.SystemImages.Alpine, kubeCluster.LocalKubeConfigPath, kubeCluster.PrivateRegistriesMap)
if certificates != nil {
break
}
}
if err != nil || certificates == nil {
return nil, nil, fmt.Errorf("Failed to fetch certificates from etcd hosts: %v", err)
}
clientCert := cert.EncodeCertPEM(certificates[pki.KubeNodeCertName].Certificate)
clientkey := cert.EncodePrivateKeyPEM(certificates[pki.KubeNodeCertName].Key)
return clientCert, clientkey, nil
}
func (c *Cluster) SaveBackupCertificateBundle(ctx context.Context) error {
backupHosts := c.getBackupHosts()
var errgrp errgroup.Group
for _, host := range backupHosts {
runHost := host
errgrp.Go(func() error {
return pki.SaveBackupBundleOnHost(ctx, runHost, c.SystemImages.Alpine, services.EtcdSnapshotPath, c.PrivateRegistriesMap)
})
}
return errgrp.Wait()
}
func (c *Cluster) ExtractBackupCertificateBundle(ctx context.Context) error {
backupHosts := c.getBackupHosts()
var errgrp errgroup.Group
errList := []string{}
for _, host := range backupHosts {
runHost := host
errgrp.Go(func() error {
if err := pki.ExtractBackupBundleOnHost(ctx, runHost, c.SystemImages.Alpine, services.EtcdSnapshotPath, c.PrivateRegistriesMap); err != nil {
errList = append(errList, fmt.Errorf(
"Failed to extract certificate bundle on host [%s], please make sure etcd bundle exist in /opt/rke/etcd-snapshots/pki.bundle.tar.gz: %v", runHost.Address, err).Error())
}
return nil
})
}
errgrp.Wait()
if len(errList) == len(backupHosts) {
return fmt.Errorf(strings.Join(errList, ","))
}
return nil
}
func (c *Cluster) getBackupHosts() []*hosts.Host {
var backupHosts []*hosts.Host
if len(c.Services.Etcd.ExternalURLs) > 0 {
backupHosts = c.ControlPlaneHosts
} else {
// Save certificates on etcd and controlplane hosts
backupHosts = hosts.GetUniqueHostList(c.EtcdHosts, c.ControlPlaneHosts, nil)
}
return backupHosts
}
func regenerateAPIAggregationCerts(c *Cluster, certificates map[string]pki.CertificatePKI) (map[string]pki.CertificatePKI, error) {
logrus.Debugf("[certificates] Regenerating Kubernetes API server aggregation layer requestheader client CA certificates")
requestHeaderCACrt, requestHeaderCAKey, err := pki.GenerateCACertAndKey(pki.RequestHeaderCACertName)
if err != nil {
return nil, err
}
certificates[pki.RequestHeaderCACertName] = pki.ToCertObject(pki.RequestHeaderCACertName, "", "", requestHeaderCACrt, requestHeaderCAKey)
//generate API server proxy client key and certs
logrus.Debugf("[certificates] Regenerating Kubernetes API server proxy client certificates")
apiserverProxyClientCrt, apiserverProxyClientKey, err := pki.GenerateSignedCertAndKey(requestHeaderCACrt, requestHeaderCAKey, true, pki.APIProxyClientCertName, nil, nil, nil)
if err != nil {
return nil, err
}
certificates[pki.APIProxyClientCertName] = pki.ToCertObject(pki.APIProxyClientCertName, "", "", apiserverProxyClientCrt, apiserverProxyClientKey)
return certificates, nil
}