forked from rancher/rke
/
certificates.go
178 lines (166 loc) · 6.5 KB
/
certificates.go
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package cluster
import (
"context"
"crypto/rsa"
"fmt"
"time"
"github.com/rancher/rke/hosts"
"github.com/rancher/rke/k8s"
"github.com/rancher/rke/log"
"github.com/rancher/rke/pki"
"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
} else {
var backupHost *hosts.Host
if len(kubeCluster.Services.Etcd.ExternalURLs) > 0 {
backupHost = kubeCluster.ControlPlaneHosts[0]
} else {
backupHost = kubeCluster.EtcdHosts[0]
}
log.Infof(ctx, "[certificates] Attempting to recover certificates from backup on host [%s]", backupHost.Address)
kubeCluster.Certificates, err = pki.FetchCertificatesFromHost(ctx, kubeCluster.EtcdHosts, backupHost, kubeCluster.SystemImages.Alpine, kubeCluster.LocalKubeConfigPath, kubeCluster.PrivateRegistriesMap)
if err != nil {
return err
}
if kubeCluster.Certificates != nil {
log.Infof(ctx, "[certificates] Certificate backup found on host [%s]", backupHost.Address)
// 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)
}
}
return nil
}
log.Infof(ctx, "[certificates] No Certificate backup found on host [%s]", backupHost.Address)
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 control host [%s]", backupHost.Address)
if err := pki.DeployCertificatesOnHost(ctx, backupHost, kubeCluster.Certificates, kubeCluster.SystemImages.CertDownloader, pki.TempCertPath, kubeCluster.PrivateRegistriesMap); err != nil {
return err
}
log.Infof(ctx, "[certificates] Saved certs to control host [%s]", backupHost.Address)
}
}
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,
}
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 {
return nil, err
}
secretCert, _ := cert.ParseCertsPEM(secret.Data["Certificate"])
secretKey, _ := cert.ParsePrivateKeyPEM(secret.Data["Key"])
secretConfig := string(secret.Data["Config"])
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")
}
}