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impersonator_config.go
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impersonator_config.go
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// Copyright 2021-2022 the Pinniped contributors. All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
package impersonatorconfig
import (
"context"
"crypto/tls"
"crypto/x509"
"encoding/base64"
"encoding/json"
"encoding/pem"
"fmt"
"net"
"sort"
"strings"
"time"
"github.com/go-logr/logr"
v1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/api/equality"
k8serrors "k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/util/errors"
utilerrors "k8s.io/apimachinery/pkg/util/errors"
"k8s.io/apimachinery/pkg/util/intstr"
utilruntime "k8s.io/apimachinery/pkg/util/runtime"
"k8s.io/apimachinery/pkg/util/sets"
"k8s.io/apimachinery/pkg/util/validation"
corev1informers "k8s.io/client-go/informers/core/v1"
"k8s.io/client-go/kubernetes"
"k8s.io/klog/v2"
"k8s.io/utils/clock"
"go.pinniped.dev/generated/latest/apis/concierge/config/v1alpha1"
pinnipedclientset "go.pinniped.dev/generated/latest/client/concierge/clientset/versioned"
conciergeconfiginformers "go.pinniped.dev/generated/latest/client/concierge/informers/externalversions/config/v1alpha1"
"go.pinniped.dev/internal/certauthority"
"go.pinniped.dev/internal/clusterhost"
"go.pinniped.dev/internal/concierge/impersonator"
"go.pinniped.dev/internal/constable"
pinnipedcontroller "go.pinniped.dev/internal/controller"
"go.pinniped.dev/internal/controller/apicerts"
"go.pinniped.dev/internal/controller/issuerconfig"
"go.pinniped.dev/internal/controllerlib"
"go.pinniped.dev/internal/dynamiccert"
"go.pinniped.dev/internal/endpointaddr"
"go.pinniped.dev/internal/plog"
)
const (
defaultHTTPSPort = 443
approximatelyOneHundredYears = 100 * 365 * 24 * time.Hour
caCommonName = "Pinniped Impersonation Proxy Serving CA"
caCrtKey = "ca.crt"
caKeyKey = "ca.key"
appLabelKey = "app"
annotationKeysKey = "credentialissuer.pinniped.dev/annotation-keys"
)
type impersonatorConfigController struct {
namespace string
credentialIssuerResourceName string
impersonationProxyPort int
generatedLoadBalancerServiceName string
generatedClusterIPServiceName string
tlsSecretName string
caSecretName string
impersonationSignerSecretName string
k8sClient kubernetes.Interface
pinnipedAPIClient pinnipedclientset.Interface
credIssuerInformer conciergeconfiginformers.CredentialIssuerInformer
servicesInformer corev1informers.ServiceInformer
secretsInformer corev1informers.SecretInformer
labels map[string]string
clock clock.Clock
impersonationSigningCertProvider dynamiccert.Provider
impersonatorFunc impersonator.FactoryFunc
hasControlPlaneNodes *bool
serverStopCh chan struct{}
errorCh chan error
tlsServingCertDynamicCertProvider dynamiccert.Private
infoLog logr.Logger
debugLog logr.Logger
}
func NewImpersonatorConfigController(
namespace string,
credentialIssuerResourceName string,
k8sClient kubernetes.Interface,
pinnipedAPIClient pinnipedclientset.Interface,
credentialIssuerInformer conciergeconfiginformers.CredentialIssuerInformer,
servicesInformer corev1informers.ServiceInformer,
secretsInformer corev1informers.SecretInformer,
withInformer pinnipedcontroller.WithInformerOptionFunc,
impersonationProxyPort int,
generatedLoadBalancerServiceName string,
generatedClusterIPServiceName string,
tlsSecretName string,
caSecretName string,
labels map[string]string,
clock clock.Clock,
impersonatorFunc impersonator.FactoryFunc,
impersonationSignerSecretName string,
impersonationSigningCertProvider dynamiccert.Provider,
log logr.Logger,
) controllerlib.Controller {
secretNames := sets.NewString(tlsSecretName, caSecretName, impersonationSignerSecretName)
log = log.WithName("impersonator-config-controller")
return controllerlib.New(
controllerlib.Config{
Name: "impersonator-config-controller",
Syncer: &impersonatorConfigController{
namespace: namespace,
credentialIssuerResourceName: credentialIssuerResourceName,
impersonationProxyPort: impersonationProxyPort,
generatedLoadBalancerServiceName: generatedLoadBalancerServiceName,
generatedClusterIPServiceName: generatedClusterIPServiceName,
tlsSecretName: tlsSecretName,
caSecretName: caSecretName,
impersonationSignerSecretName: impersonationSignerSecretName,
k8sClient: k8sClient,
pinnipedAPIClient: pinnipedAPIClient,
credIssuerInformer: credentialIssuerInformer,
servicesInformer: servicesInformer,
secretsInformer: secretsInformer,
labels: labels,
clock: clock,
impersonationSigningCertProvider: impersonationSigningCertProvider,
impersonatorFunc: impersonatorFunc,
tlsServingCertDynamicCertProvider: dynamiccert.NewServingCert("impersonation-proxy-serving-cert"),
infoLog: log.V(plog.KlogLevelInfo),
debugLog: log.V(plog.KlogLevelDebug),
},
},
withInformer(credentialIssuerInformer,
pinnipedcontroller.SimpleFilterWithSingletonQueue(func(obj metav1.Object) bool {
return obj.GetName() == credentialIssuerResourceName
}),
controllerlib.InformerOption{},
),
withInformer(
servicesInformer,
pinnipedcontroller.SimpleFilterWithSingletonQueue(func(obj metav1.Object) bool {
if obj.GetNamespace() != namespace {
return false
}
switch obj.GetName() {
case generatedLoadBalancerServiceName, generatedClusterIPServiceName:
return true
default:
return false
}
}),
controllerlib.InformerOption{},
),
withInformer(
secretsInformer,
pinnipedcontroller.SimpleFilterWithSingletonQueue(func(obj metav1.Object) bool {
return obj.GetNamespace() == namespace && secretNames.Has(obj.GetName())
}),
controllerlib.InformerOption{},
),
)
}
func (c *impersonatorConfigController) Sync(syncCtx controllerlib.Context) error {
c.debugLog.Info("starting impersonatorConfigController Sync")
// Load the CredentialIssuer that we'll update with status.
credIssuer, err := c.credIssuerInformer.Lister().Get(c.credentialIssuerResourceName)
if err != nil {
return fmt.Errorf("could not get CredentialIssuer to update: %w", err)
}
strategy, err := c.doSync(syncCtx, credIssuer)
if err != nil {
strategy = &v1alpha1.CredentialIssuerStrategy{
Type: v1alpha1.ImpersonationProxyStrategyType,
Status: v1alpha1.ErrorStrategyStatus,
Reason: strategyReasonForError(err),
Message: err.Error(),
LastUpdateTime: metav1.NewTime(c.clock.Now()),
}
}
err = utilerrors.NewAggregate([]error{err, issuerconfig.Update(
syncCtx.Context,
c.pinnipedAPIClient,
credIssuer,
*strategy,
)})
if err == nil {
c.debugLog.Info("successfully finished impersonatorConfigController Sync")
}
return err
}
// strategyReasonForError returns the proper v1alpha1.StrategyReason for a sync error. Some errors are occasionally
// expected because there are multiple pods running, in these cases we should report a Pending reason and we'll
// recover on a following sync.
func strategyReasonForError(err error) v1alpha1.StrategyReason {
switch {
case k8serrors.IsConflict(err), k8serrors.IsAlreadyExists(err):
return v1alpha1.PendingStrategyReason
default:
return v1alpha1.ErrorDuringSetupStrategyReason
}
}
type certNameInfo struct {
// ready will be true when the certificate name information is known.
// ready will be false when it is pending because we are waiting for a load balancer to get assigned an ip/hostname.
// When false, the other fields in this struct should not be considered meaningful and may be zero values.
ready bool
// The IP address or hostname which was selected to be used as the name in the cert.
// Either selectedIP or selectedHostname will be set, but not both.
selectedIPs []net.IP
selectedHostname string
// The name of the endpoint to which a client should connect to talk to the impersonator.
// This may be a hostname or an IP, and may include a port number.
clientEndpoint string
}
func (c *impersonatorConfigController) doSync(syncCtx controllerlib.Context, credIssuer *v1alpha1.CredentialIssuer) (*v1alpha1.CredentialIssuerStrategy, error) {
ctx := syncCtx.Context
impersonationSpec, err := c.loadImpersonationProxyConfiguration(credIssuer)
if err != nil {
return nil, err
}
// Make a live API call to avoid the cost of having an informer watch all node changes on the cluster,
// since there could be lots and we don't especially care about node changes.
// Once we have concluded that there is or is not a visible control plane, then cache that decision
// to avoid listing nodes very often.
if c.hasControlPlaneNodes == nil {
hasControlPlaneNodes, err := clusterhost.New(c.k8sClient).HasControlPlaneNodes(ctx)
if err != nil {
return nil, err
}
c.hasControlPlaneNodes = &hasControlPlaneNodes
c.debugLog.Info("queried for control plane nodes", "foundControlPlaneNodes", hasControlPlaneNodes)
}
if c.shouldHaveImpersonator(impersonationSpec) {
if err = c.ensureImpersonatorIsStarted(syncCtx); err != nil {
return nil, err
}
} else {
if err = c.ensureImpersonatorIsStopped(true); err != nil {
return nil, err
}
}
if c.shouldHaveLoadBalancer(impersonationSpec) {
if err = c.ensureLoadBalancerIsStarted(ctx, impersonationSpec); err != nil {
return nil, err
}
} else {
if err = c.ensureLoadBalancerIsStopped(ctx); err != nil {
return nil, err
}
}
if c.shouldHaveClusterIPService(impersonationSpec) {
if err = c.ensureClusterIPServiceIsStarted(ctx, impersonationSpec); err != nil {
return nil, err
}
} else {
if err = c.ensureClusterIPServiceIsStopped(ctx); err != nil {
return nil, err
}
}
nameInfo, err := c.findDesiredTLSCertificateName(impersonationSpec)
if err != nil {
return nil, err
}
var impersonationCA *certauthority.CA
if c.shouldHaveImpersonator(impersonationSpec) {
if impersonationCA, err = c.ensureCASecretIsCreated(ctx); err != nil {
return nil, err
}
if err = c.ensureTLSSecret(ctx, nameInfo, impersonationCA); err != nil {
return nil, err
}
} else {
if err = c.ensureTLSSecretIsRemoved(ctx); err != nil {
return nil, err
}
c.clearTLSSecret()
}
credentialIssuerStrategyResult := c.doSyncResult(nameInfo, impersonationSpec, impersonationCA)
if c.shouldHaveImpersonator(impersonationSpec) {
if err = c.loadSignerCA(); err != nil {
return nil, err
}
} else {
c.clearSignerCA()
}
return credentialIssuerStrategyResult, nil
}
func (c *impersonatorConfigController) loadImpersonationProxyConfiguration(credIssuer *v1alpha1.CredentialIssuer) (*v1alpha1.ImpersonationProxySpec, error) {
// Make a copy of the spec since we got this object from informer cache.
spec := credIssuer.Spec.DeepCopy().ImpersonationProxy
if spec == nil {
return nil, fmt.Errorf("could not load CredentialIssuer: spec.impersonationProxy is nil")
}
// Default service type to LoadBalancer (this is normally already done via CRD defaulting).
if spec.Service.Type == "" {
spec.Service.Type = v1alpha1.ImpersonationProxyServiceTypeLoadBalancer
}
if err := validateCredentialIssuerSpec(spec); err != nil {
return nil, fmt.Errorf("could not load CredentialIssuer spec.impersonationProxy: %w", err)
}
c.debugLog.Info("read impersonation proxy config", "credentialIssuer", c.credentialIssuerResourceName)
return spec, nil
}
func (c *impersonatorConfigController) shouldHaveImpersonator(config *v1alpha1.ImpersonationProxySpec) bool {
return c.enabledByAutoMode(config) || config.Mode == v1alpha1.ImpersonationProxyModeEnabled
}
func (c *impersonatorConfigController) enabledByAutoMode(config *v1alpha1.ImpersonationProxySpec) bool {
return config.Mode == v1alpha1.ImpersonationProxyModeAuto && !*c.hasControlPlaneNodes
}
func (c *impersonatorConfigController) disabledByAutoMode(config *v1alpha1.ImpersonationProxySpec) bool {
return config.Mode == v1alpha1.ImpersonationProxyModeAuto && *c.hasControlPlaneNodes
}
func (c *impersonatorConfigController) disabledExplicitly(config *v1alpha1.ImpersonationProxySpec) bool {
return config.Mode == v1alpha1.ImpersonationProxyModeDisabled
}
func (c *impersonatorConfigController) shouldHaveLoadBalancer(config *v1alpha1.ImpersonationProxySpec) bool {
return c.shouldHaveImpersonator(config) && config.Service.Type == v1alpha1.ImpersonationProxyServiceTypeLoadBalancer
}
func (c *impersonatorConfigController) shouldHaveClusterIPService(config *v1alpha1.ImpersonationProxySpec) bool {
return c.shouldHaveImpersonator(config) && config.Service.Type == v1alpha1.ImpersonationProxyServiceTypeClusterIP
}
func (c *impersonatorConfigController) serviceExists(serviceName string) (bool, *v1.Service, error) {
service, err := c.servicesInformer.Lister().Services(c.namespace).Get(serviceName)
notFound := k8serrors.IsNotFound(err)
if notFound {
return false, nil, nil
}
if err != nil {
return false, nil, err
}
return true, service, nil
}
func (c *impersonatorConfigController) tlsSecretExists() (bool, *v1.Secret, error) {
secret, err := c.secretsInformer.Lister().Secrets(c.namespace).Get(c.tlsSecretName)
notFound := k8serrors.IsNotFound(err)
if notFound {
return false, nil, nil
}
if err != nil {
return false, nil, err
}
return true, secret, nil
}
func (c *impersonatorConfigController) ensureImpersonatorIsStarted(syncCtx controllerlib.Context) error {
if c.serverStopCh != nil {
// The server was already started, but it could have died in the background, so make a non-blocking
// check to see if it has sent any errors on the errorCh.
select {
case runningErr := <-c.errorCh:
if runningErr == nil {
// The server sent a nil error, meaning that it shutdown without reporting any particular
// error for some reason. We would still like to report this as an error for logging purposes.
runningErr = constable.Error("unexpected shutdown of proxy server")
}
// The server has stopped, so finish shutting it down.
// If that fails too, return both errors for logging purposes.
// By returning an error, the sync function will be called again
// and we'll have a chance to restart the server.
close(c.errorCh) // We don't want ensureImpersonatorIsStopped to block on reading this channel.
stoppingErr := c.ensureImpersonatorIsStopped(false)
return errors.NewAggregate([]error{runningErr, stoppingErr})
default:
// Seems like it is still running, so nothing to do.
return nil
}
}
c.infoLog.Info("starting impersonation proxy", "port", c.impersonationProxyPort)
startImpersonatorFunc, err := c.impersonatorFunc(
c.impersonationProxyPort,
c.tlsServingCertDynamicCertProvider,
c.impersonationSigningCertProvider,
)
if err != nil {
return err
}
c.serverStopCh = make(chan struct{})
// use a buffered channel so that startImpersonatorFunc can send
// on it without coordinating with the main controller go routine
c.errorCh = make(chan error, 1)
// startImpersonatorFunc will block until the server shuts down (or fails to start), so run it in the background.
go func() {
defer utilruntime.HandleCrash()
// The server has stopped, so enqueue ourselves for another sync,
// so we can try to start the server again as quickly as possible.
defer syncCtx.Queue.AddRateLimited(syncCtx.Key)
// Forward any errors returned by startImpersonatorFunc on the errorCh.
c.errorCh <- startImpersonatorFunc(c.serverStopCh)
}()
return nil
}
func (c *impersonatorConfigController) ensureImpersonatorIsStopped(shouldCloseErrChan bool) error {
if c.serverStopCh == nil {
return nil
}
c.infoLog.Info("stopping impersonation proxy", "port", c.impersonationProxyPort)
close(c.serverStopCh)
stopErr := <-c.errorCh
if shouldCloseErrChan {
close(c.errorCh)
}
c.serverStopCh = nil
c.errorCh = nil
return stopErr
}
func (c *impersonatorConfigController) ensureLoadBalancerIsStarted(ctx context.Context, config *v1alpha1.ImpersonationProxySpec) error {
appNameLabel := c.labels[appLabelKey]
loadBalancer := v1.Service{
Spec: v1.ServiceSpec{
Type: v1.ServiceTypeLoadBalancer,
Ports: []v1.ServicePort{
{
TargetPort: intstr.FromInt(c.impersonationProxyPort),
Port: defaultHTTPSPort,
Protocol: v1.ProtocolTCP,
},
},
LoadBalancerIP: config.Service.LoadBalancerIP,
Selector: map[string]string{appLabelKey: appNameLabel},
},
ObjectMeta: metav1.ObjectMeta{
Name: c.generatedLoadBalancerServiceName,
Namespace: c.namespace,
Labels: c.labels,
Annotations: config.Service.Annotations,
},
}
return c.createOrUpdateService(ctx, &loadBalancer)
}
func (c *impersonatorConfigController) ensureLoadBalancerIsStopped(ctx context.Context) error {
running, service, err := c.serviceExists(c.generatedLoadBalancerServiceName)
if err != nil {
return err
}
if !running {
return nil
}
c.infoLog.Info("deleting load balancer for impersonation proxy",
"service", klog.KRef(c.namespace, c.generatedLoadBalancerServiceName),
)
err = c.k8sClient.CoreV1().Services(c.namespace).Delete(ctx, c.generatedLoadBalancerServiceName, metav1.DeleteOptions{
Preconditions: &metav1.Preconditions{
UID: &service.UID,
ResourceVersion: &service.ResourceVersion,
},
})
return utilerrors.FilterOut(err, k8serrors.IsNotFound)
}
func (c *impersonatorConfigController) ensureClusterIPServiceIsStarted(ctx context.Context, config *v1alpha1.ImpersonationProxySpec) error {
appNameLabel := c.labels[appLabelKey]
clusterIP := v1.Service{
Spec: v1.ServiceSpec{
Type: v1.ServiceTypeClusterIP,
Ports: []v1.ServicePort{
{
TargetPort: intstr.FromInt(c.impersonationProxyPort),
Port: defaultHTTPSPort,
Protocol: v1.ProtocolTCP,
},
},
Selector: map[string]string{appLabelKey: appNameLabel},
},
ObjectMeta: metav1.ObjectMeta{
Name: c.generatedClusterIPServiceName,
Namespace: c.namespace,
Labels: c.labels,
Annotations: config.Service.Annotations,
},
}
return c.createOrUpdateService(ctx, &clusterIP)
}
func (c *impersonatorConfigController) ensureClusterIPServiceIsStopped(ctx context.Context) error {
running, service, err := c.serviceExists(c.generatedClusterIPServiceName)
if err != nil {
return err
}
if !running {
return nil
}
c.infoLog.Info("deleting cluster ip for impersonation proxy",
"service", klog.KRef(c.namespace, c.generatedClusterIPServiceName),
)
err = c.k8sClient.CoreV1().Services(c.namespace).Delete(ctx, c.generatedClusterIPServiceName, metav1.DeleteOptions{
Preconditions: &metav1.Preconditions{
UID: &service.UID,
ResourceVersion: &service.ResourceVersion,
},
})
return utilerrors.FilterOut(err, k8serrors.IsNotFound)
}
func (c *impersonatorConfigController) createOrUpdateService(ctx context.Context, desiredService *v1.Service) error {
log := c.infoLog.WithValues("serviceType", desiredService.Spec.Type, "service", klog.KObj(desiredService))
// Prepare to remember which annotation keys were added from the CredentialIssuer spec, both for
// creates and for updates, in case someone removes a key from the spec in the future. We would like
// to be able to detect that the missing key means that we should remove the key. This is needed to
// differentiate it from a key that was added by another actor, which we should not remove.
// But don't bother recording the requested annotations if there were no annotations requested.
desiredAnnotationKeys := make([]string, 0, len(desiredService.Annotations))
for k := range desiredService.Annotations {
desiredAnnotationKeys = append(desiredAnnotationKeys, k)
}
if len(desiredAnnotationKeys) > 0 {
// Sort them since they come out of the map in no particular order.
sort.Strings(desiredAnnotationKeys)
keysJSONArray, err := json.Marshal(desiredAnnotationKeys)
if err != nil {
return err // This shouldn't really happen. We should always be able to marshal an array of strings.
}
// Save the desired annotations to a bookkeeping annotation.
desiredService.Annotations[annotationKeysKey] = string(keysJSONArray)
}
// Get the Service from the informer, and create it if it does not already exist.
existingService, err := c.servicesInformer.Lister().Services(c.namespace).Get(desiredService.Name)
if k8serrors.IsNotFound(err) {
log.Info("creating service for impersonation proxy")
_, err := c.k8sClient.CoreV1().Services(c.namespace).Create(ctx, desiredService, metav1.CreateOptions{})
return err
}
if err != nil {
return err
}
// The Service already exists, so update only the specific fields that are meaningfully part of our desired state.
updatedService := existingService.DeepCopy()
updatedService.ObjectMeta.Labels = desiredService.ObjectMeta.Labels
updatedService.Spec.LoadBalancerIP = desiredService.Spec.LoadBalancerIP
updatedService.Spec.Type = desiredService.Spec.Type
updatedService.Spec.Selector = desiredService.Spec.Selector
// Do not simply overwrite the existing annotations with the desired annotations. Instead, merge-overwrite.
// Another actor in the system, like a human user or a non-Pinniped controller, might have updated the
// existing Service's annotations. If they did, then we do not want to overwrite those keys expect for
// the specific keys that are from the CredentialIssuer's spec, because if we overwrite keys belonging
// to another controller then we could end up infinitely flapping back and forth with the other controller,
// both updating that annotation on the Service.
if updatedService.Annotations == nil {
updatedService.Annotations = map[string]string{}
}
for k, v := range desiredService.Annotations {
updatedService.Annotations[k] = v
}
// Check if the the existing Service contains a record of previous annotations that were added by this controller.
// Note that in an upgrade, older versions of Pinniped might have created the Service without this bookkeeping annotation.
oldDesiredAnnotationKeysJSON, foundOldDesiredAnnotationKeysJSON := existingService.Annotations[annotationKeysKey]
oldDesiredAnnotationKeys := []string{}
if foundOldDesiredAnnotationKeysJSON {
_ = json.Unmarshal([]byte(oldDesiredAnnotationKeysJSON), &oldDesiredAnnotationKeys)
// In the unlikely event that we cannot parse the value of our bookkeeping annotation, just act like it
// wasn't present and update it to the new value that it should have based on the current desired state.
}
// Check if any annotations which were previously in the CredentialIssuer spec are now gone from the spec,
// which means that those now-missing annotations should get deleted.
for _, oldKey := range oldDesiredAnnotationKeys {
if _, existsInDesired := desiredService.Annotations[oldKey]; !existsInDesired {
delete(updatedService.Annotations, oldKey)
}
}
// If no annotations were requested, then remove the special bookkeeping annotation which might be
// leftover from a previous update. During the next update, non-existence will be taken to mean
// that no annotations were previously requested by the CredentialIssuer spec.
if len(desiredAnnotationKeys) == 0 {
delete(updatedService.Annotations, annotationKeysKey)
}
// If our updates didn't change anything, we're done.
if equality.Semantic.DeepEqual(existingService, updatedService) {
return nil
}
// Otherwise apply the updates.
c.infoLog.Info("updating service for impersonation proxy")
_, err = c.k8sClient.CoreV1().Services(c.namespace).Update(ctx, updatedService, metav1.UpdateOptions{})
return err
}
func (c *impersonatorConfigController) ensureTLSSecret(ctx context.Context, nameInfo *certNameInfo, ca *certauthority.CA) error {
secretFromInformer, err := c.secretsInformer.Lister().Secrets(c.namespace).Get(c.tlsSecretName)
notFound := k8serrors.IsNotFound(err)
if !notFound && err != nil {
return err
}
if !notFound {
secretWasDeleted, err := c.deleteTLSSecretWhenCertificateDoesNotMatchDesiredState(ctx, nameInfo, ca, secretFromInformer)
if err != nil {
return err
}
// If it was deleted by the above call, then set it to nil. This allows us to avoid waiting
// for the informer cache to update before deciding to proceed to create the new Secret below.
if secretWasDeleted {
secretFromInformer = nil
}
}
return c.ensureTLSSecretIsCreatedAndLoaded(ctx, nameInfo, secretFromInformer, ca)
}
func (c *impersonatorConfigController) deleteTLSSecretWhenCertificateDoesNotMatchDesiredState(ctx context.Context, nameInfo *certNameInfo, ca *certauthority.CA, secret *v1.Secret) (bool, error) {
certPEM := secret.Data[v1.TLSCertKey]
block, _ := pem.Decode(certPEM)
if block == nil {
c.infoLog.Info("found missing or not PEM-encoded data in TLS Secret",
"invalidCertPEM", string(certPEM),
"secret", klog.KObj(secret),
)
deleteErr := c.ensureTLSSecretIsRemoved(ctx)
if deleteErr != nil {
return false, fmt.Errorf("found missing or not PEM-encoded data in TLS Secret, but got error while deleting it: %w", deleteErr)
}
return true, nil
}
actualCertFromSecret, err := x509.ParseCertificate(block.Bytes)
if err != nil {
c.infoLog.Error(err, "found missing or not PEM-encoded data in TLS Secret",
"invalidCertPEM", string(certPEM),
"secret", klog.KObj(secret),
)
if err = c.ensureTLSSecretIsRemoved(ctx); err != nil {
return false, fmt.Errorf("PEM data represented an invalid cert, but got error while deleting it: %w", err)
}
return true, nil
}
keyPEM := secret.Data[v1.TLSPrivateKeyKey]
_, err = tls.X509KeyPair(certPEM, keyPEM)
if err != nil {
c.infoLog.Error(err, "found invalid private key PEM data in TLS Secret",
"invalidCertPEM", string(certPEM),
"secret", klog.KObj(secret),
)
if err = c.ensureTLSSecretIsRemoved(ctx); err != nil {
return false, fmt.Errorf("cert had an invalid private key, but got error while deleting it: %w", err)
}
return true, nil
}
opts := x509.VerifyOptions{Roots: ca.Pool()}
if _, err = actualCertFromSecret.Verify(opts); err != nil {
// The TLS cert was not signed by the current CA. Since they are mismatched, delete the TLS cert
// so we can recreate it using the current CA.
if err = c.ensureTLSSecretIsRemoved(ctx); err != nil {
return false, err
}
return true, nil
}
if !nameInfo.ready {
// We currently have a secret but we are waiting for a load balancer to be assigned an ingress, so
// our current secret must be old/unwanted.
if err = c.ensureTLSSecretIsRemoved(ctx); err != nil {
return false, err
}
return true, nil
}
actualIPs := actualCertFromSecret.IPAddresses
actualHostnames := actualCertFromSecret.DNSNames
c.infoLog.Info("checking TLS certificate names",
"desiredIPs", nameInfo.selectedIPs,
"desiredHostname", nameInfo.selectedHostname,
"actualIPs", actualIPs,
"actualHostnames", actualHostnames,
"secret", klog.KObj(secret),
)
if certHostnameAndIPMatchDesiredState(nameInfo.selectedIPs, actualIPs, nameInfo.selectedHostname, actualHostnames) {
// The cert already matches the desired state, so there is no need to delete/recreate it.
return false, nil
}
if err = c.ensureTLSSecretIsRemoved(ctx); err != nil {
return false, err
}
return true, nil
}
func certHostnameAndIPMatchDesiredState(desiredIPs []net.IP, actualIPs []net.IP, desiredHostname string, actualHostnames []string) bool {
if len(desiredIPs) > 0 && len(actualIPs) > 0 && len(actualIPs) == len(desiredIPs) && len(actualHostnames) == 0 {
for i := range desiredIPs {
if !actualIPs[i].Equal(desiredIPs[i]) {
return false
}
}
return true
}
if desiredHostname != "" && len(actualHostnames) == 1 && desiredHostname == actualHostnames[0] && len(actualIPs) == 0 {
return true
}
return false
}
func (c *impersonatorConfigController) ensureTLSSecretIsCreatedAndLoaded(ctx context.Context, nameInfo *certNameInfo, secret *v1.Secret, ca *certauthority.CA) error {
if secret != nil {
err := c.loadTLSCertFromSecret(secret)
if err != nil {
return err
}
return nil
}
if !nameInfo.ready {
return nil
}
newTLSSecret, err := c.createNewTLSSecret(ctx, ca, nameInfo.selectedIPs, nameInfo.selectedHostname)
if err != nil {
return err
}
err = c.loadTLSCertFromSecret(newTLSSecret)
if err != nil {
return err
}
return nil
}
func (c *impersonatorConfigController) ensureCASecretIsCreated(ctx context.Context) (*certauthority.CA, error) {
caSecret, err := c.secretsInformer.Lister().Secrets(c.namespace).Get(c.caSecretName)
if err != nil && !k8serrors.IsNotFound(err) {
return nil, err
}
var impersonationCA *certauthority.CA
if k8serrors.IsNotFound(err) {
impersonationCA, err = c.createCASecret(ctx)
} else {
crtBytes := caSecret.Data[caCrtKey]
keyBytes := caSecret.Data[caKeyKey]
impersonationCA, err = certauthority.Load(string(crtBytes), string(keyBytes))
}
if err != nil {
return nil, err
}
return impersonationCA, nil
}
func (c *impersonatorConfigController) createCASecret(ctx context.Context) (*certauthority.CA, error) {
impersonationCA, err := certauthority.New(caCommonName, approximatelyOneHundredYears)
if err != nil {
return nil, fmt.Errorf("could not create impersonation CA: %w", err)
}
caPrivateKeyPEM, err := impersonationCA.PrivateKeyToPEM()
if err != nil {
return nil, err
}
secret := v1.Secret{
ObjectMeta: metav1.ObjectMeta{
Name: c.caSecretName,
Namespace: c.namespace,
Labels: c.labels,
},
Data: map[string][]byte{
caCrtKey: impersonationCA.Bundle(),
caKeyKey: caPrivateKeyPEM,
},
Type: v1.SecretTypeOpaque,
}
c.infoLog.Info("creating CA certificates for impersonation proxy",
"secret", klog.KObj(&secret),
)
if _, err = c.k8sClient.CoreV1().Secrets(c.namespace).Create(ctx, &secret, metav1.CreateOptions{}); err != nil {
return nil, err
}
return impersonationCA, nil
}
func (c *impersonatorConfigController) findDesiredTLSCertificateName(config *v1alpha1.ImpersonationProxySpec) (*certNameInfo, error) {
if config.ExternalEndpoint != "" {
return c.findTLSCertificateNameFromEndpointConfig(config), nil
} else if config.Service.Type == v1alpha1.ImpersonationProxyServiceTypeClusterIP {
return c.findTLSCertificateNameFromClusterIPService()
}
return c.findTLSCertificateNameFromLoadBalancer()
}
func (c *impersonatorConfigController) findTLSCertificateNameFromEndpointConfig(config *v1alpha1.ImpersonationProxySpec) *certNameInfo {
addr, _ := endpointaddr.Parse(config.ExternalEndpoint, 443)
endpoint := strings.TrimSuffix(addr.Endpoint(), ":443")
if ip := net.ParseIP(addr.Host); ip != nil {
return &certNameInfo{ready: true, selectedIPs: []net.IP{ip}, clientEndpoint: endpoint}
}
return &certNameInfo{ready: true, selectedHostname: addr.Host, clientEndpoint: endpoint}
}
func (c *impersonatorConfigController) findTLSCertificateNameFromLoadBalancer() (*certNameInfo, error) {
lb, err := c.servicesInformer.Lister().Services(c.namespace).Get(c.generatedLoadBalancerServiceName)
notFound := k8serrors.IsNotFound(err)
if notFound {
// We aren't ready and will try again later in this case.
return &certNameInfo{ready: false}, nil
}
if err != nil {
return nil, err
}
ingresses := lb.Status.LoadBalancer.Ingress
if len(ingresses) == 0 || (ingresses[0].Hostname == "" && ingresses[0].IP == "") {
c.infoLog.Info("load balancer for impersonation proxy does not have an ingress yet, so skipping tls cert generation while we wait",
"service", klog.KObj(lb),
)
return &certNameInfo{ready: false}, nil
}
for _, ingress := range ingresses {
hostname := ingress.Hostname
if hostname != "" {
return &certNameInfo{ready: true, selectedHostname: hostname, clientEndpoint: hostname}, nil
}
}
for _, ingress := range ingresses {
ip := ingress.IP
parsedIP := net.ParseIP(ip)
if parsedIP != nil {
return &certNameInfo{ready: true, selectedIPs: []net.IP{parsedIP}, clientEndpoint: ip}, nil
}
}
return nil, fmt.Errorf("could not find valid IP addresses or hostnames from load balancer %s/%s", c.namespace, lb.Name)
}
func (c *impersonatorConfigController) findTLSCertificateNameFromClusterIPService() (*certNameInfo, error) {
clusterIP, err := c.servicesInformer.Lister().Services(c.namespace).Get(c.generatedClusterIPServiceName)
notFound := k8serrors.IsNotFound(err)
if notFound {
// We aren't ready and will try again later in this case.
return &certNameInfo{ready: false}, nil
}
if err != nil {
return nil, err
}
ip := clusterIP.Spec.ClusterIP
ips := clusterIP.Spec.ClusterIPs
if ip != "" {
// clusterIP will always exist when clusterIPs does, but not vice versa
var parsedIPs []net.IP
if len(ips) > 0 {
for _, ipFromIPs := range ips {
parsedIPs = append(parsedIPs, net.ParseIP(ipFromIPs))
}
} else {
parsedIPs = []net.IP{net.ParseIP(ip)}
}
return &certNameInfo{ready: true, selectedIPs: parsedIPs, clientEndpoint: ip}, nil
}
return &certNameInfo{ready: false}, nil
}
func (c *impersonatorConfigController) createNewTLSSecret(ctx context.Context, ca *certauthority.CA, ips []net.IP, hostname string) (*v1.Secret, error) {
var hostnames []string
if hostname != "" {
hostnames = []string{hostname}
}
impersonationCert, err := ca.IssueServerCert(hostnames, ips, approximatelyOneHundredYears)
if err != nil {
return nil, fmt.Errorf("could not create impersonation cert: %w", err)
}
certPEM, keyPEM, err := certauthority.ToPEM(impersonationCert)
if err != nil {
return nil, err
}
newTLSSecret := &v1.Secret{
ObjectMeta: metav1.ObjectMeta{
Name: c.tlsSecretName,
Namespace: c.namespace,
Labels: c.labels,
},
Data: map[string][]byte{
v1.TLSPrivateKeyKey: keyPEM,
v1.TLSCertKey: certPEM,
},
Type: v1.SecretTypeTLS,
}
c.infoLog.Info("creating TLS certificates for impersonation proxy",
"ips", ips,
"hostnames", hostnames,
"secret", klog.KObj(newTLSSecret),
)
return c.k8sClient.CoreV1().Secrets(c.namespace).Create(ctx, newTLSSecret, metav1.CreateOptions{})
}
func (c *impersonatorConfigController) loadTLSCertFromSecret(tlsSecret *v1.Secret) error {
certPEM := tlsSecret.Data[v1.TLSCertKey]
keyPEM := tlsSecret.Data[v1.TLSPrivateKeyKey]
if err := c.tlsServingCertDynamicCertProvider.SetCertKeyContent(certPEM, keyPEM); err != nil {
return fmt.Errorf("could not parse TLS cert PEM data from Secret: %w", err)
}
c.infoLog.Info("loading TLS certificates for impersonation proxy",
"certPEM", string(certPEM),
"secret", klog.KObj(tlsSecret),
)
return nil
}
func (c *impersonatorConfigController) ensureTLSSecretIsRemoved(ctx context.Context) error {
tlsSecretExists, secret, err := c.tlsSecretExists()
if err != nil {
return err
}
if !tlsSecretExists {
return nil
}
c.infoLog.Info("deleting TLS serving certificate for impersonation proxy",
"secret", klog.KRef(c.namespace, c.tlsSecretName),
)
err = c.k8sClient.CoreV1().Secrets(c.namespace).Delete(ctx, c.tlsSecretName, metav1.DeleteOptions{
Preconditions: &metav1.Preconditions{
UID: &secret.UID,
ResourceVersion: &secret.ResourceVersion,
},
})
// it is okay if we tried to delete and we got a not found error. This probably means
// another instance of the concierge got here first so there's nothing to delete.
return utilerrors.FilterOut(err, k8serrors.IsNotFound)
}
func (c *impersonatorConfigController) clearTLSSecret() {
c.debugLog.Info("clearing TLS serving certificate for impersonation proxy")
c.tlsServingCertDynamicCertProvider.UnsetCertKeyContent()
}
func (c *impersonatorConfigController) loadSignerCA() error {
signingCertSecret, err := c.secretsInformer.Lister().Secrets(c.namespace).Get(c.impersonationSignerSecretName)
if err != nil {
return fmt.Errorf("could not load the impersonator's credential signing secret: %w", err)
}