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cert-manager.go
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cert-manager.go
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package bootstrap
import (
"crypto/tls"
"fmt"
"os"
"path/filepath"
"sync"
"time"
"github.com/fsnotify/fsnotify"
v1 "k8s.io/api/core/v1"
"k8s.io/client-go/tools/cache"
"k8s.io/client-go/util/certificate"
"kubevirt.io/kubevirt/pkg/certificates/triple"
"kubevirt.io/client-go/log"
"kubevirt.io/kubevirt/pkg/certificates/triple/cert"
)
const (
CertBytesValue = "tls.crt"
KeyBytesValue = "tls.key"
)
type FileCertificateManager struct {
stopCh chan struct{}
certAccessLock sync.Mutex
stopped bool
cert *tls.Certificate
certBytesPath string
keyBytesPath string
errorRetryInterval time.Duration
}
// NewFallbackCertificateManager returns a certificate manager which can fall back to a self signed certificate,
// if there is currently no kubevirt installation present on the cluster. This helps dealing with situations where e.g.
// readiness probes try to access an API which can't right now provide a fully managed certificate.
// virt-operator is the main recipient of this manager, since the certificate management infrastructure is not always
// already present when virt-operator gets created.
func NewFallbackCertificateManager(certManager certificate.Manager) *FallbackCertificateManager {
caKeyPair, _ := triple.NewCA("kubevirt.io", time.Hour*24*7)
keyPair, _ := triple.NewServerKeyPair(
caKeyPair,
"fallback.certificate.kubevirt.io",
"fallback",
"fallback",
"cluster.local",
nil,
nil,
time.Hour*24*356*10,
)
crt, err := tls.X509KeyPair(cert.EncodeCertPEM(keyPair.Cert), cert.EncodePrivateKeyPEM(keyPair.Key))
if err != nil {
log.DefaultLogger().Reason(err).Critical("Failed to generate a fallback certificate.")
}
crt.Leaf = keyPair.Cert
return &FallbackCertificateManager{
certManager: certManager,
fallbackCertificate: &crt,
}
}
type FallbackCertificateManager struct {
certManager certificate.Manager
fallbackCertificate *tls.Certificate
}
func (f *FallbackCertificateManager) Start() {
f.certManager.Start()
}
func (f *FallbackCertificateManager) Stop() {
f.certManager.Stop()
}
func (f *FallbackCertificateManager) Current() *tls.Certificate {
crt := f.certManager.Current()
if crt != nil {
return crt
}
return f.fallbackCertificate
}
func (f *FallbackCertificateManager) ServerHealthy() bool {
return f.certManager.ServerHealthy()
}
func NewFileCertificateManager(certBytesPath string, keyBytesPath string) *FileCertificateManager {
return &FileCertificateManager{
certBytesPath: certBytesPath,
keyBytesPath: keyBytesPath,
stopCh: make(chan struct{}, 1),
errorRetryInterval: 1 * time.Minute,
}
}
func (f *FileCertificateManager) Start() {
objectUpdated := make(chan struct{}, 1)
watcher, err := fsnotify.NewWatcher()
if err != nil {
log.DefaultLogger().Reason(err).Critical("Failed to create an inotify watcher")
}
defer watcher.Close()
certDir := filepath.Dir(f.certBytesPath)
err = watcher.Add(certDir)
if err != nil {
log.DefaultLogger().Reason(err).Criticalf("Failed to establish a watch on %s", f.certBytesPath)
}
keyDir := filepath.Dir(f.keyBytesPath)
if keyDir != certDir {
err = watcher.Add(keyDir)
if err != nil {
log.DefaultLogger().Reason(err).Criticalf("Failed to establish a watch on %s", f.keyBytesPath)
}
}
go func() {
for {
select {
case _, ok := <-watcher.Events:
if !ok {
return
}
select {
case objectUpdated <- struct{}{}:
default:
log.DefaultLogger().V(5).Infof("Dropping redundant wakeup for cert reload")
}
case err, ok := <-watcher.Errors:
if !ok {
return
}
log.DefaultLogger().Reason(err).Errorf("An error occurred when watching certificates files %s and %s", f.certBytesPath, f.keyBytesPath)
}
}
}()
// ensure we load the certificates on startup
objectUpdated <- struct{}{}
sync:
for {
select {
case <-objectUpdated:
if err := f.rotateCerts(); err != nil {
go func() {
time.Sleep(f.errorRetryInterval)
select {
case objectUpdated <- struct{}{}:
default:
log.DefaultLogger().V(5).Infof("Dropping redundant wakeup for cert reload")
}
}()
}
case <-f.stopCh:
break sync
}
}
}
func (f *FileCertificateManager) Stop() {
f.certAccessLock.Lock()
defer f.certAccessLock.Unlock()
if f.stopped {
return
}
close(f.stopCh)
f.stopped = true
}
func (f *FileCertificateManager) ServerHealthy() bool {
panic("implement me")
}
func (s *FileCertificateManager) Current() *tls.Certificate {
s.certAccessLock.Lock()
defer s.certAccessLock.Unlock()
return s.cert
}
func (f *FileCertificateManager) rotateCerts() error {
crt, err := f.loadCertificates()
if err != nil {
log.DefaultLogger().Reason(err).Errorf("failed to load the certificate %s and %s", f.certBytesPath, f.keyBytesPath)
return err
}
f.certAccessLock.Lock()
defer f.certAccessLock.Unlock()
// update after the callback, to ensure that the reconfiguration succeeded
f.cert = crt
log.DefaultLogger().Infof("certificate with common name '%s' retrieved.", crt.Leaf.Subject.CommonName)
return nil
}
func (f *FileCertificateManager) loadCertificates() (serverCrt *tls.Certificate, err error) {
// #nosec No risk for path injection. Used for specific cert file for key rotation
certBytes, err := os.ReadFile(f.certBytesPath)
if err != nil {
return nil, err
}
// #nosec No risk for path injection. Used for specific cert file for key rotation
keyBytes, err := os.ReadFile(f.keyBytesPath)
if err != nil {
return nil, err
}
crt, err := tls.X509KeyPair(certBytes, keyBytes)
if err != nil {
return nil, fmt.Errorf("failed to load certificate: %v\n", err)
}
leaf, err := cert.ParseCertsPEM(certBytes)
if err != nil {
return nil, fmt.Errorf("failed to load leaf certificate: %v\n", err)
}
crt.Leaf = leaf[0]
return &crt, nil
}
type SecretCertificateManager struct {
store cache.Store
secretKey string
tlsCrt string
tlsKey string
crtLock *sync.Mutex
revision string
crt *tls.Certificate
}
func (s *SecretCertificateManager) Start() {
}
func (s *SecretCertificateManager) Stop() {
}
func (s *SecretCertificateManager) Current() *tls.Certificate {
s.crtLock.Lock()
defer s.crtLock.Unlock()
rawSecret, exists, err := s.store.GetByKey(s.secretKey)
if err != nil {
log.DefaultLogger().Reason(err).Errorf("Secret %s can't be retrieved from the cache", s.secretKey)
return s.crt
} else if !exists {
return s.crt
}
secret := rawSecret.(*v1.Secret)
if secret.ObjectMeta.ResourceVersion == s.revision {
return s.crt
}
crt, err := tls.X509KeyPair(secret.Data[s.tlsCrt], secret.Data[s.tlsKey])
if err != nil {
log.DefaultLogger().Reason(err).Errorf("failed to load certificate from secret %s", s.secretKey)
return s.crt
}
leaf, err := cert.ParseCertsPEM(secret.Data[s.tlsCrt])
if err != nil {
log.DefaultLogger().Reason(err).Errorf("failed to load leaf certificate from secret %s", s.secretKey)
return s.crt
}
crt.Leaf = leaf[0]
s.revision = secret.ResourceVersion
s.crt = &crt
return s.crt
}
func (s *SecretCertificateManager) ServerHealthy() bool {
panic("implement me")
}
// NewSecretCertificateManager takes a secret store and the name and the namespace of a secret. If there is a newer
// version of the secret in the cache, the next Current() call will immediately wield it. It takes resource versions
// into account to be efficient.
func NewSecretCertificateManager(name string, namespace string, store cache.Store) *SecretCertificateManager {
return &SecretCertificateManager{
store: store,
secretKey: fmt.Sprintf("%s/%s", namespace, name),
tlsCrt: CertBytesValue,
tlsKey: KeyBytesValue,
crtLock: &sync.Mutex{},
}
}