/
certificated.go
314 lines (258 loc) · 11.2 KB
/
certificated.go
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package identity
import (
"io/ioutil"
"math/rand"
"path/filepath"
"strings"
"time"
"github.com/cenkalti/backoff"
"github.com/pkg/errors"
"github.com/yahoo/k8s-athenz-identity/pkg/log"
"github.com/yahoo/k8s-athenz-identity/pkg/util"
)
func Certificated(idConfig *IdentityConfig, stopChan <-chan struct{}) error {
if idConfig.ProviderService == "" {
log.Infof("Certificate provisioning is disabled with empty options: provider service[%s]", idConfig.ProviderService)
}
if idConfig.TargetDomainRoles == "" || idConfig.RoleCertDir == "" {
log.Infof("Role certificate provisioning is disabled with empty options: roles[%s], output directory[%s]", idConfig.TargetDomainRoles, idConfig.RoleCertDir)
}
var identity, backupIdentity *InstanceIdentity
var keyPem, backupKeyPem []byte
handler, err := InitIdentityHandler(idConfig)
if err != nil {
log.Errorf("Failed to initialize client for certificates: %s", err.Error())
return err
}
writeFiles := func(id *InstanceIdentity, keyPEM []byte, roleCerts [](*RoleCertificate)) error {
w := util.NewWriter()
if id != nil {
leafPEM := []byte(id.X509CertificatePEM)
if len(leafPEM) != 0 && len(keyPEM) != 0 {
x509Cert, err := util.CertificateFromPEMBytes(leafPEM)
if err != nil {
return errors.Wrap(err, "unable to parse x509 cert")
}
log.Infof("[New Instance Certificate] Subject: %s, Issuer: %s, NotBefore: %s, NotAfter: %s, SerialNumber: %s, DNSNames: %s",
x509Cert.Subject, x509Cert.Issuer, x509Cert.NotBefore, x509Cert.NotAfter, x509Cert.SerialNumber, x509Cert.DNSNames)
log.Debugf("Saving x509 cert[%d bytes] at %s", len(leafPEM), idConfig.CertFile)
if err := w.AddBytes(idConfig.CertFile, 0644, leafPEM); err != nil {
return errors.Wrap(err, "unable to save x509 cert")
}
log.Debugf("Saving x509 key[%d bytes] at %s", len(keyPEM), idConfig.KeyFile)
if err := w.AddBytes(idConfig.KeyFile, 0644, keyPEM); err != nil { // TODO: finalize perms and user
return errors.Wrap(err, "unable to save x509 key")
}
}
caCertPEM := []byte(id.X509CACertificatePEM)
if len(caCertPEM) != 0 && idConfig.CaCertFile != "" {
log.Debugf("Saving x509 cacert[%d bytes] at %s", len(caCertPEM), idConfig.CaCertFile)
if err := w.AddBytes(idConfig.CaCertFile, 0644, caCertPEM); err != nil {
return errors.Wrap(err, "unable to save x509 cacert")
}
}
}
if roleCerts != nil {
for _, rolecert := range roleCerts {
roleCertPEM := []byte(rolecert.X509Certificate)
if len(roleCertPEM) != 0 {
log.Infof("[New Role Certificate] Subject: %s, Issuer: %s, NotBefore: %s, NotAfter: %s, SerialNumber: %s, DNSNames: %s",
rolecert.Subject, rolecert.Issuer, rolecert.NotBefore, rolecert.NotAfter, rolecert.SerialNumber, rolecert.DNSNames)
outPath := filepath.Join(idConfig.RoleCertDir, rolecert.Domain+idConfig.RoleCertFilenameDelimiter+rolecert.Role+".cert.pem")
log.Debugf("Saving x509 role cert[%d bytes] at [%s]", len(roleCertPEM), outPath)
if err := w.AddBytes(outPath, 0644, roleCertPEM); err != nil {
return errors.Wrap(err, "unable to save x509 role cert")
}
}
}
}
return w.Save()
}
identityProvisioningRequest := func(idConfig *IdentityConfig, handler *identityHandler, forceInit bool) (err error, identity *InstanceIdentity, keyPem []byte) {
log.Infof("Mapped Athenz domain[%s], service[%s]", handler.Domain(), handler.Service())
identity, keyPem, err = handler.GetX509Cert(forceInit)
if err != nil {
log.Warnf("Error while requesting x509 certificate to identity provider: %s", err.Error())
if idConfig.CertSecret != "" && strings.Contains(idConfig.Backup, "write") {
log.Errorf("Failed to receive x509 certificate to update kubernetes secret[%s]: %s", idConfig.CertSecret, err.Error())
return
}
} else {
log.Infoln("Successfully received x509 certificate from identity provider")
if idConfig.CertSecret != "" && strings.Contains(idConfig.Backup, "write") {
log.Infof("Attempting to save x509 certificate to kubernetes secret[%s]...", idConfig.CertSecret)
err = handler.ApplyX509CertToSecret(identity, keyPem)
if err != nil {
log.Errorf("Failed to save x509 certificate to kubernetes secret: %s", err.Error())
return
}
log.Infof("Successfully saved x509 certificate to kubernetes secret")
} else {
log.Debugf("Skipping to save x509 certificate temporary backup to Kubernetes secret[%s]", idConfig.CertSecret)
}
}
return
}
// getExponentialBackoff will return a backoff config with first retry delay of 5s, and backoff retry
// until REFRESH_INTERVAL / 4
getExponentialBackoff := func() *backoff.ExponentialBackOff {
b := backoff.NewExponentialBackOff()
b.InitialInterval = 5 * time.Second
b.Multiplier = 2
b.MaxElapsedTime = idConfig.Refresh / 4
return b
}
notifyOnErr := func(err error, backoffDelay time.Duration) {
log.Errorf("Failed to refresh certificates: %s. Retrying in %s", err.Error(), backoffDelay)
}
run := func() error {
if idConfig.ProviderService != "" {
log.Infof("Attempting to request x509 certificate to identity provider[%s]...", idConfig.ProviderService)
err, identity, keyPem = identityProvisioningRequest(idConfig, handler, false)
if err != nil {
log.Errorf("Failed to reteieve x509 certificate from identity provider: %s", err.Error())
}
}
if identity == nil || len(keyPem) == 0 {
if idConfig.CertSecret != "" && strings.Contains(idConfig.Backup, "read") {
log.Infof("Attempting to load x509 certificate temporary backup from kubernetes secret[%s]...", idConfig.CertSecret)
backupIdentity, backupKeyPem, err = handler.GetX509CertFromSecret()
if err != nil {
log.Warnf("Error while loading x509 certificate temporary backup from kubernetes secret: %s", err.Error())
}
if backupIdentity == nil || len(backupKeyPem) == 0 {
log.Warnf("Failed to load x509 certificate temporary backup from kubernetes secret: secret was empty")
} else {
identity = backupIdentity
keyPem = backupKeyPem
log.Infof("Successfully loaded x509 certificate from kubernetes secret")
}
} else {
log.Debugf("Skipping to load x509 certificate temporary backup from Kubernetes secret[%s]", idConfig.CertSecret)
}
}
var roleIdentity *InstanceIdentity
var roleKeyPem, roleCertPem []byte
var roleCerts [](*RoleCertificate)
if idConfig.TargetDomainRoles != "" && idConfig.RoleCertDir != "" {
if identity == nil || len(keyPem) == 0 {
log.Debugf("Attempting to load x509 certificate from local file to get x509 role certs: key[%s], cert[%s]...", idConfig.KeyFile, idConfig.CertFile)
roleCertPem, err = ioutil.ReadFile(idConfig.CertFile)
if err != nil {
log.Warnf("Error while reading x509 certificate from local file[%s]: %s", idConfig.CertFile, err.Error())
}
roleKeyPem, err = ioutil.ReadFile(idConfig.KeyFile)
if err != nil {
log.Warnf("Error while reading x509 certificate key from local file[%s]: %s", idConfig.KeyFile, err.Error())
}
roleIdentity, err = InstanceIdentityFromPEMBytes(roleCertPem)
if err != nil {
log.Warnf("Error while parsing x509 certificate from local file: %s", err.Error())
}
if roleIdentity == nil || len(roleKeyPem) == 0 {
log.Errorf("Failed to load x509 certificate from local file to get x509 role certs: key size[%d]bytes, certificate size[%d]bytes", len(roleKeyPem), len(roleCertPem))
} else {
log.Debugf("Successfully loaded x509 certificate from local file to get x509 role certs: key size[%d]bytes, certificate size[%d]bytes", len(roleKeyPem), len(roleCertPem))
}
} else {
roleIdentity = identity
roleKeyPem = keyPem
}
if roleIdentity != nil && len(roleKeyPem) != 0 {
log.Infof("Attempting to get x509 role certs from identity provider: targets[%s]...", idConfig.TargetDomainRoles)
roleCerts, err = handler.GetX509RoleCert(roleIdentity, roleKeyPem)
if err != nil {
log.Warnf("Error while requesting x509 role certificate to identity provider: %s", err.Error())
return err
} else {
log.Infoln("Successfully received x509 role certs from identity provider")
}
}
}
err = writeFiles(identity, keyPem, roleCerts)
if err != nil {
log.Errorf("Failed to save files for key[%s], cert[%s] and certificates for roles[%v]", idConfig.KeyFile, idConfig.CertFile, idConfig.TargetDomainRoles)
return err
}
if backupIdentity != nil && len(backupKeyPem) != 0 && idConfig.ProviderService != "" {
log.Infof("Attempting to request renewed x509 certificate to identity provider[%s]...", idConfig.ProviderService)
err, identity, keyPem = identityProvisioningRequest(idConfig, handler, true)
if err != nil {
log.Errorf("Failed to reteieve renewed x509 certificate from identity provider: %s", err.Error())
}
err = writeFiles(identity, keyPem, nil)
if err != nil {
log.Errorf("Failed to save files for renewed key[%s] and renewed cert[%s]", idConfig.KeyFile, idConfig.CertFile)
return err
}
}
return err
}
deleteRequest := func() error {
if idConfig.DeleteInstanceID && !idConfig.Init && handler.InstanceID() != "" {
log.Infoln("Attempting to delete x509 certificate record from identity provider...")
err := handler.DeleteX509CertRecord()
if err != nil {
log.Warnf("Error while deleting x509 certificate Instance ID record: %s", err.Error())
return err
}
log.Infof("Successfully deleted x509 certificate Instance ID record[%s]", handler.InstanceID())
}
return nil
}
if idConfig.DelayJitterSeconds != 0 {
rand.Seed(time.Now().UnixNano())
sleep := time.Duration(rand.Int63n(idConfig.DelayJitterSeconds)) * time.Second
log.Infof("Delaying boot with jitter [%s] randomized from [%s]...", sleep, time.Duration(idConfig.DelayJitterSeconds)*time.Second)
time.Sleep(sleep)
}
err = backoff.RetryNotify(run, getExponentialBackoff(), notifyOnErr)
if idConfig.Init {
if err != nil {
log.Errorf("Failed to get initial certificate after multiple retries: %s", err.Error())
return err
}
}
go func() {
tokenChan := make(chan struct{})
authorizerChan := make(chan struct{})
metricsChan := make(chan struct{})
err = Tokend(idConfig, tokenChan)
if err != nil {
log.Errorf("Error starting token provider[%s]", err)
return
}
err = Authorizerd(idConfig, metricsChan)
if err != nil {
log.Errorf("Error starting authorizer[%s]", err)
return
}
err = Metricsd(idConfig, metricsChan)
if err != nil {
log.Errorf("Error starting metrics exporter[%s]", err)
return
}
t := time.NewTicker(idConfig.Refresh)
defer t.Stop()
for {
log.Infof("Refreshing key[%s], cert[%s] and certificates for roles[%v] with provider[%s], backup[%s] and secret[%s] in %s", idConfig.KeyFile, idConfig.CertFile, idConfig.TargetDomainRoles, idConfig.ProviderService, idConfig.Backup, idConfig.CertSecret, idConfig.Refresh)
select {
case <-t.C:
err := backoff.RetryNotify(run, getExponentialBackoff(), notifyOnErr)
if err != nil {
log.Errorf("Failed to refresh x509 certificate after multiple retries: %s", err.Error())
}
case <-stopChan:
err = deleteRequest()
if err != nil {
log.Errorf("Failed to delete x509 certificate Instance ID record: %s", err.Error())
}
close(metricsChan)
close(authorizerChan)
close(tokenChan)
return
}
}
}()
return nil
}