forked from openshift/hive
/
controlplanecerts_controller.go
438 lines (383 loc) · 15 KB
/
controlplanecerts_controller.go
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package controlplanecerts
import (
"context"
"crypto/md5"
"fmt"
"io"
"net/url"
"sort"
"time"
"github.com/pkg/errors"
log "github.com/sirupsen/logrus"
corev1 "k8s.io/api/core/v1"
apierrors "k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/types"
"k8s.io/apimachinery/pkg/util/sets"
k8slabels "k8s.io/kubernetes/pkg/util/labels"
"sigs.k8s.io/controller-runtime/pkg/client"
"sigs.k8s.io/controller-runtime/pkg/controller"
"sigs.k8s.io/controller-runtime/pkg/controller/controllerutil"
"sigs.k8s.io/controller-runtime/pkg/handler"
"sigs.k8s.io/controller-runtime/pkg/manager"
"sigs.k8s.io/controller-runtime/pkg/reconcile"
"sigs.k8s.io/controller-runtime/pkg/source"
configv1 "github.com/openshift/api/config/v1"
apihelpers "github.com/openshift/hive/pkg/apis/helpers"
hivev1 "github.com/openshift/hive/pkg/apis/hive/v1"
"github.com/openshift/hive/pkg/constants"
hivemetrics "github.com/openshift/hive/pkg/controller/metrics"
controllerutils "github.com/openshift/hive/pkg/controller/utils"
"github.com/openshift/hive/pkg/remoteclient"
"github.com/openshift/hive/pkg/resource"
)
const (
controllerName = "controlPlaneCerts"
openshiftConfigNamespace = "openshift-config"
certsNotFoundReason = "ControlPlaneCertificatesNotFound"
certsNotFoundMessage = "One or more serving certificates for the cluster control plane are missing"
certsFoundReason = "ControlPlaneCertificatesFound"
certsFoundMessage = "Control plane certificates are present"
kubeAPIServerPatchTemplate = `[ {"op": "replace", "path": "/spec/forceRedeploymentReason", "value": %q } ]`
)
var (
secretCheckInterval = 2 * time.Minute
)
type applier interface {
ApplyRuntimeObject(obj runtime.Object, scheme *runtime.Scheme) (resource.ApplyResult, error)
}
// Add creates a new ControlPlaneCerts Controller and adds it to the Manager with default RBAC. The Manager will set fields on the Controller
// and Start it when the Manager is Started.
func Add(mgr manager.Manager) error {
return AddToManager(mgr, NewReconciler(mgr))
}
// NewReconciler returns a new reconcile.Reconciler
func NewReconciler(mgr manager.Manager) reconcile.Reconciler {
logger := log.WithField("controller", controllerName)
helper := resource.NewHelperWithMetricsFromRESTConfig(mgr.GetConfig(), controllerName, logger)
r := &ReconcileControlPlaneCerts{
Client: controllerutils.NewClientWithMetricsOrDie(mgr, controllerName),
scheme: mgr.GetScheme(),
applier: helper,
}
r.remoteClientBuilder = func(cd *hivev1.ClusterDeployment) remoteclient.Builder {
return remoteclient.NewBuilder(r.Client, cd, controllerName)
}
return r
}
// AddToManager adds a new Controller to mgr with r as the reconcile.Reconciler
func AddToManager(mgr manager.Manager, r reconcile.Reconciler) error {
// Create a new controller
c, err := controller.New("controlplanecerts-controller", mgr, controller.Options{Reconciler: r, MaxConcurrentReconciles: controllerutils.GetConcurrentReconciles()})
if err != nil {
return err
}
// Watch for changes to ClusterDeployment
err = c.Watch(&source.Kind{Type: &hivev1.ClusterDeployment{}}, &handler.EnqueueRequestForObject{})
if err != nil {
return err
}
return nil
}
var _ reconcile.Reconciler = &ReconcileControlPlaneCerts{}
// ReconcileControlPlaneCerts reconciles a ClusterDeployment object
type ReconcileControlPlaneCerts struct {
client.Client
scheme *runtime.Scheme
applier applier
remoteClientBuilder func(*hivev1.ClusterDeployment) remoteclient.Builder
}
// Reconcile reads that state of the cluster for a ClusterDeployment object and makes changes based on the state read
// and what is in the ClusterDeployment.Spec
func (r *ReconcileControlPlaneCerts) Reconcile(request reconcile.Request) (reconcile.Result, error) {
start := time.Now()
cdLog := log.WithFields(log.Fields{
"clusterDeployment": request.Name,
"namespace": request.Namespace,
"controller": controllerName,
})
cdLog.Info("reconciling cluster deployment")
defer func() {
dur := time.Since(start)
hivemetrics.MetricControllerReconcileTime.WithLabelValues(controllerName).Observe(dur.Seconds())
cdLog.WithField("elapsed", dur).Info("reconcile complete")
}()
// Fetch the ClusterDeployment instance
cd := &hivev1.ClusterDeployment{}
err := r.Get(context.TODO(), request.NamespacedName, cd)
if err != nil {
if apierrors.IsNotFound(err) {
return reconcile.Result{}, nil
}
return reconcile.Result{}, err
}
// If the clusterdeployment is deleted, do not reconcile.
if cd.DeletionTimestamp != nil {
return reconcile.Result{}, nil
}
if !cd.Spec.Installed {
return reconcile.Result{}, nil
}
existingSyncSet := &hivev1.SyncSet{}
existingSyncSetNamespacedName := types.NamespacedName{Namespace: cd.Namespace, Name: GenerateControlPlaneCertsSyncSetName(cd.Name)}
err = r.Get(context.TODO(), existingSyncSetNamespacedName, existingSyncSet)
if err != nil && !apierrors.IsNotFound(err) {
cdLog.WithError(err).Error("failed to retrieve existing control plane certs syncset")
return reconcile.Result{}, err
}
if apierrors.IsNotFound(err) {
existingSyncSet = nil
}
secrets, secretsAvailable, err := r.getControlPlaneSecrets(cd, cdLog)
if err != nil {
cdLog.WithError(err).Error("failed to check cert secret availability")
return reconcile.Result{}, err
}
// clear condition if certs were found
updated, err := r.setCertsNotFoundCondition(cd, !secretsAvailable, cdLog)
if err != nil {
cdLog.WithError(err).Log(controllerutils.LogLevel(err), "cannot update cluster deployment secrets not found condition")
return reconcile.Result{}, err
}
if updated {
return reconcile.Result{}, nil
}
if !secretsAvailable {
cdLog.Debugf("cert secrets are not available yet, requeueing clusterdeployment for %s", secretCheckInterval)
return reconcile.Result{RequeueAfter: secretCheckInterval}, nil
}
if len(secrets) == 0 && existingSyncSet == nil {
cdLog.Debug("no control plane certs needed, and no syncset exists, nothing to do")
return reconcile.Result{}, nil
}
desiredSyncSet, err := r.generateControlPlaneCertsSyncSet(cd, secrets, cdLog)
if err != nil {
cdLog.WithError(err).Error("failed to generate control plane certs syncset")
return reconcile.Result{}, err
}
if _, err = r.applier.ApplyRuntimeObject(desiredSyncSet, r.scheme); err != nil {
cdLog.WithError(err).Error("failed to apply control plane certificates syncset")
return reconcile.Result{}, err
}
return reconcile.Result{}, nil
}
func (r *ReconcileControlPlaneCerts) getControlPlaneSecrets(cd *hivev1.ClusterDeployment, cdLog log.FieldLogger) ([]*corev1.Secret, bool, error) {
secretsNeeded, err := getControlPlaneSecretNames(cd, cdLog)
if err != nil {
return nil, false, err
}
if len(secretsNeeded) == 0 {
cdLog.Debug("the control plane does not require any cert bundles")
return nil, true, nil
}
secrets := []*corev1.Secret{}
for _, secretName := range secretsNeeded {
secret := &corev1.Secret{}
err := r.Get(context.TODO(), types.NamespacedName{Namespace: cd.Namespace, Name: secretName}, secret)
if err != nil {
if apierrors.IsNotFound(err) {
cdLog.WithField("secret", secretName).Debug("certificate secret is not available yet, will check later")
return nil, false, nil
}
cdLog.WithError(err).WithField("secret", secretName).Debug("error retrieving certificate secret")
return nil, false, err
}
secrets = append(secrets, secret)
}
cdLog.Debug("all required certificate secrets are available")
return secrets, true, nil
}
func getControlPlaneSecretNames(cd *hivev1.ClusterDeployment, cdLog log.FieldLogger) ([]string, error) {
certs := sets.NewString()
if cd.Spec.ControlPlaneConfig.ServingCertificates.Default != "" {
certs.Insert(cd.Spec.ControlPlaneConfig.ServingCertificates.Default)
}
for _, additional := range cd.Spec.ControlPlaneConfig.ServingCertificates.Additional {
certs.Insert(additional.Name)
}
if certs.Len() == 0 {
return nil, nil
}
cdLog.WithField("certbundles", certs.List()).Debug("cert bundles used by the control plane")
secretsNeeded := sets.NewString()
for _, cert := range certs.List() {
bundle := certificateBundle(cd, cert)
if bundle == nil {
// should not happen if clusterdeployment was validated
return nil, fmt.Errorf("no certificate bundle was found for %s", cert)
}
secretsNeeded.Insert(bundle.CertificateSecretRef.Name)
}
cdLog.WithField("secrets", secretsNeeded.List()).Debug("certificate secrets needed by the control plane")
return secretsNeeded.List(), nil
}
func (r *ReconcileControlPlaneCerts) generateControlPlaneCertsSyncSet(cd *hivev1.ClusterDeployment, secrets []*corev1.Secret, cdLog log.FieldLogger) (*hivev1.SyncSet, error) {
cdLog.Debug("generating syncset for control plane secrets")
syncSet := &hivev1.SyncSet{
ObjectMeta: metav1.ObjectMeta{
Name: GenerateControlPlaneCertsSyncSetName(cd.Name),
Namespace: cd.Namespace,
},
Spec: hivev1.SyncSetSpec{
SyncSetCommonSpec: hivev1.SyncSetCommonSpec{
ResourceApplyMode: hivev1.SyncResourceApplyMode,
},
ClusterDeploymentRefs: []corev1.LocalObjectReference{
{
Name: cd.Name,
},
},
},
}
// Using SecretMapping to sync secrets
secretMappings := []hivev1.SecretMapping{}
for _, secret := range secrets {
cdLog.WithField("secret", secret.Name).Debug("adding secret to secretReferences list")
secretMapping := hivev1.SecretMapping{
SourceRef: hivev1.SecretReference{
Namespace: secret.Namespace,
Name: secret.Name,
},
TargetRef: hivev1.SecretReference{
Name: remoteSecretName(secret.Name, cd),
Namespace: openshiftConfigNamespace,
},
}
secretMappings = append(secretMappings, secretMapping)
}
syncSet.Spec.Secrets = secretMappings
resources := []runtime.RawExtension{}
apiServerConfig := &configv1.APIServer{
ObjectMeta: metav1.ObjectMeta{
Name: "cluster",
},
}
additionalCerts := cd.Spec.ControlPlaneConfig.ServingCertificates.Additional
if cd.Spec.ControlPlaneConfig.ServingCertificates.Default != "" {
cdLog.Debug("setting default serving certificate for control plane")
apidomain, err := r.defaultControlPlaneDomain(cd)
if err != nil {
cdLog.WithError(err).Error("failed to get control plane domain")
return nil, err
}
cpCert := hivev1.ControlPlaneAdditionalCertificate{
Name: cd.Spec.ControlPlaneConfig.ServingCertificates.Default,
Domain: apidomain,
}
additionalCerts = append([]hivev1.ControlPlaneAdditionalCertificate{cpCert}, additionalCerts...)
}
for _, additional := range additionalCerts {
cdLog.WithField("name", additional.Name).Debug("adding named certificate to control plane config")
bundle := certificateBundle(cd, additional.Name)
apiServerConfig.Spec.ServingCerts.NamedCertificates = append(apiServerConfig.Spec.ServingCerts.NamedCertificates, configv1.APIServerNamedServingCert{
Names: []string{additional.Domain},
ServingCertificate: configv1.SecretNameReference{
Name: remoteSecretName(bundle.CertificateSecretRef.Name, cd),
},
})
}
resources = append(resources, runtime.RawExtension{Object: apiServerConfig})
var err error
resources, err = controllerutils.AddTypeMeta(resources, r.scheme)
if err != nil {
cdLog.WithError(err).Error("cannot add typemeta to syncset resources")
return nil, err
}
// kubeAPIServerPatch sets the forceRedeploymentField on the kube API server cluster operator
// to a hash of all the cert secrets. If the content of the certs secrets changes, then the new
// hash value will force the kube API server to redeploy and apply the new certs.
kubeAPIServerPatch := hivev1.SyncObjectPatch{
APIVersion: "operator.openshift.io/v1",
Kind: "KubeAPIServer",
Name: "cluster",
Patch: fmt.Sprintf(kubeAPIServerPatchTemplate, secretsHash(secrets)),
PatchType: "json",
}
syncSet.Spec.Resources = resources
syncSet.Spec.Patches = []hivev1.SyncObjectPatch{kubeAPIServerPatch}
// ensure the syncset gets cleaned up when the clusterdeployment is deleted
cdLog.WithField("derivedObject", syncSet.Name).Debug("Setting labels on derived object")
syncSet.Labels = k8slabels.AddLabel(syncSet.Labels, constants.ClusterDeploymentNameLabel, cd.Name)
syncSet.Labels = k8slabels.AddLabel(syncSet.Labels, constants.SyncSetTypeLabel, constants.SyncSetTypeControlPlaneCerts)
if err := controllerutil.SetControllerReference(cd, syncSet, r.scheme); err != nil {
cdLog.WithError(err).Error("error setting owner reference")
return nil, err
}
return syncSet, nil
}
func (r *ReconcileControlPlaneCerts) setCertsNotFoundCondition(cd *hivev1.ClusterDeployment, notFound bool, cdLog log.FieldLogger) (bool, error) {
status := corev1.ConditionFalse
reason := certsFoundReason
message := certsFoundMessage
if notFound {
status = corev1.ConditionTrue
reason = certsNotFoundReason
message = certsNotFoundMessage
}
conds, changed := controllerutils.SetClusterDeploymentConditionWithChangeCheck(
cd.Status.Conditions,
hivev1.ControlPlaneCertificateNotFoundCondition,
status,
reason,
message,
controllerutils.UpdateConditionNever,
)
if !changed {
return false, nil
}
cd.Status.Conditions = conds
return true, r.Status().Update(context.TODO(), cd)
}
// defaultControlPlaneDomain will attempt to return the domain/hostname for the secondary API URL
// for the cluster based on the contents of the clusterDeployment's adminKubeConfig secret.
func (r *ReconcileControlPlaneCerts) defaultControlPlaneDomain(cd *hivev1.ClusterDeployment) (string, error) {
remoteClient := r.remoteClientBuilder(cd)
apiurl, err := remoteClient.UseSecondaryAPIURL().APIURL()
if err != nil {
return "", errors.Wrap(err, "failed to fetch secondary API URL")
}
u, err := url.Parse(apiurl)
if err != nil {
return "", errors.Wrap(err, "failed to parse cluster's API URL")
}
return u.Hostname(), nil
}
func remoteSecretName(secretName string, cd *hivev1.ClusterDeployment) string {
return apihelpers.GetResourceName(cd.Name, secretName)
}
func certificateBundle(cd *hivev1.ClusterDeployment, name string) *hivev1.CertificateBundleSpec {
for i, bundle := range cd.Spec.CertificateBundles {
if bundle.Name == name {
return &cd.Spec.CertificateBundles[i]
}
}
return nil
}
// GenerateControlPlaneCertsSyncSetName generates the name of the SyncSet that holds the control plane certificates to sync.
func GenerateControlPlaneCertsSyncSetName(name string) string {
return apihelpers.GetResourceName(name, constants.ControlPlaneCertificateSuffix)
}
func writeSecretData(w io.Writer, secret *corev1.Secret) {
// sort secret keys so we get a repeatable hash
keys := make([]string, 0, len(secret.Data))
for k := range secret.Data {
keys = append(keys, k)
}
sort.StringSlice(keys).Sort()
fmt.Fprintf(w, "%s/%s\n", secret.Namespace, secret.Name)
for _, k := range keys {
fmt.Fprintf(w, "%s: %x\n", k, secret.Data[k])
}
}
func secretsHash(secrets []*corev1.Secret) string {
// sort secrets by name so we get a repeatable hash
sort.Slice(secrets, func(i, j int) bool {
return secrets[i].Name < secrets[j].Name
})
hashWriter := md5.New()
for _, secret := range secrets {
writeSecretData(hashWriter, secret)
}
return fmt.Sprintf("%x", hashWriter.Sum(nil))
}