mirror of
https://github.com/optim-enterprises-bv/kubernetes.git
synced 2025-11-04 04:08:16 +00:00
258 lines
8.0 KiB
Go
258 lines
8.0 KiB
Go
/*
|
|
Copyright 2016 The Kubernetes Authors.
|
|
|
|
Licensed under the Apache License, Version 2.0 (the "License");
|
|
you may not use this file except in compliance with the License.
|
|
You may obtain a copy of the License at
|
|
|
|
http://www.apache.org/licenses/LICENSE-2.0
|
|
|
|
Unless required by applicable law or agreed to in writing, software
|
|
distributed under the License is distributed on an "AS IS" BASIS,
|
|
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
See the License for the specific language governing permissions and
|
|
limitations under the License.
|
|
*/
|
|
|
|
package certificates
|
|
|
|
import (
|
|
"fmt"
|
|
"reflect"
|
|
"strings"
|
|
"time"
|
|
|
|
"k8s.io/kubernetes/pkg/api"
|
|
"k8s.io/kubernetes/pkg/apis/certificates"
|
|
"k8s.io/kubernetes/pkg/client/cache"
|
|
clientset "k8s.io/kubernetes/pkg/client/clientset_generated/internalclientset"
|
|
unversionedcore "k8s.io/kubernetes/pkg/client/clientset_generated/internalclientset/typed/core/unversioned"
|
|
"k8s.io/kubernetes/pkg/client/record"
|
|
"k8s.io/kubernetes/pkg/controller"
|
|
"k8s.io/kubernetes/pkg/controller/framework"
|
|
"k8s.io/kubernetes/pkg/runtime"
|
|
utilcertificates "k8s.io/kubernetes/pkg/util/certificates"
|
|
utilruntime "k8s.io/kubernetes/pkg/util/runtime"
|
|
"k8s.io/kubernetes/pkg/util/wait"
|
|
"k8s.io/kubernetes/pkg/util/workqueue"
|
|
"k8s.io/kubernetes/pkg/watch"
|
|
|
|
"github.com/cloudflare/cfssl/config"
|
|
"github.com/cloudflare/cfssl/signer"
|
|
"github.com/cloudflare/cfssl/signer/local"
|
|
"github.com/golang/glog"
|
|
)
|
|
|
|
type CertificateController struct {
|
|
kubeClient clientset.Interface
|
|
|
|
// CSR framework and store
|
|
csrController *framework.Controller
|
|
csrStore cache.StoreToCertificateRequestLister
|
|
|
|
// To allow injection of updateCertificateRequestStatus for testing.
|
|
updateHandler func(csr *certificates.CertificateSigningRequest) error
|
|
syncHandler func(csrKey string) error
|
|
|
|
approveAllKubeletCSRsForGroup string
|
|
|
|
signer *local.Signer
|
|
|
|
queue *workqueue.Type
|
|
}
|
|
|
|
func NewCertificateController(kubeClient clientset.Interface, syncPeriod time.Duration, caCertFile, caKeyFile string, approveAllKubeletCSRsForGroup string) (*CertificateController, error) {
|
|
// Send events to the apiserver
|
|
eventBroadcaster := record.NewBroadcaster()
|
|
eventBroadcaster.StartLogging(glog.Infof)
|
|
eventBroadcaster.StartRecordingToSink(&unversionedcore.EventSinkImpl{Interface: kubeClient.Core().Events("")})
|
|
|
|
// Configure cfssl signer
|
|
// TODO: support non-default policy and remote/pkcs11 signing
|
|
policy := &config.Signing{
|
|
Default: config.DefaultConfig(),
|
|
}
|
|
ca, err := local.NewSignerFromFile(caCertFile, caKeyFile, policy)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
cc := &CertificateController{
|
|
kubeClient: kubeClient,
|
|
queue: workqueue.New(),
|
|
signer: ca,
|
|
approveAllKubeletCSRsForGroup: approveAllKubeletCSRsForGroup,
|
|
}
|
|
|
|
// Manage the addition/update of certificate requests
|
|
cc.csrStore.Store, cc.csrController = framework.NewInformer(
|
|
&cache.ListWatch{
|
|
ListFunc: func(options api.ListOptions) (runtime.Object, error) {
|
|
return cc.kubeClient.Certificates().CertificateSigningRequests().List(options)
|
|
},
|
|
WatchFunc: func(options api.ListOptions) (watch.Interface, error) {
|
|
return cc.kubeClient.Certificates().CertificateSigningRequests().Watch(options)
|
|
},
|
|
},
|
|
&certificates.CertificateSigningRequest{},
|
|
syncPeriod,
|
|
framework.ResourceEventHandlerFuncs{
|
|
AddFunc: func(obj interface{}) {
|
|
csr := obj.(*certificates.CertificateSigningRequest)
|
|
glog.V(4).Infof("Adding certificate request %s", csr.Name)
|
|
cc.enqueueCertificateRequest(obj)
|
|
},
|
|
UpdateFunc: func(old, new interface{}) {
|
|
oldCSR := old.(*certificates.CertificateSigningRequest)
|
|
glog.V(4).Infof("Updating certificate request %s", oldCSR.Name)
|
|
cc.enqueueCertificateRequest(new)
|
|
},
|
|
DeleteFunc: func(obj interface{}) {
|
|
csr := obj.(*certificates.CertificateSigningRequest)
|
|
glog.V(4).Infof("Deleting certificate request %s", csr.Name)
|
|
cc.enqueueCertificateRequest(obj)
|
|
},
|
|
},
|
|
)
|
|
cc.syncHandler = cc.maybeSignCertificate
|
|
return cc, nil
|
|
}
|
|
|
|
// Run the main goroutine responsible for watching and syncing jobs.
|
|
func (cc *CertificateController) Run(workers int, stopCh <-chan struct{}) {
|
|
defer utilruntime.HandleCrash()
|
|
go cc.csrController.Run(stopCh)
|
|
glog.Infof("Starting certificate controller manager")
|
|
for i := 0; i < workers; i++ {
|
|
go wait.Until(cc.worker, time.Second, stopCh)
|
|
}
|
|
<-stopCh
|
|
glog.Infof("Shutting down certificate controller")
|
|
cc.queue.ShutDown()
|
|
}
|
|
|
|
// worker runs a thread that dequeues CSRs, handles them, and marks them done.
|
|
func (cc *CertificateController) worker() {
|
|
for {
|
|
func() {
|
|
key, quit := cc.queue.Get()
|
|
if quit {
|
|
return
|
|
}
|
|
defer cc.queue.Done(key)
|
|
err := cc.syncHandler(key.(string))
|
|
if err != nil {
|
|
glog.Errorf("Error syncing CSR: %v", err)
|
|
}
|
|
}()
|
|
}
|
|
}
|
|
|
|
func (cc *CertificateController) enqueueCertificateRequest(obj interface{}) {
|
|
key, err := controller.KeyFunc(obj)
|
|
if err != nil {
|
|
glog.Errorf("Couldn't get key for object %+v: %v", obj, err)
|
|
return
|
|
}
|
|
cc.queue.Add(key)
|
|
}
|
|
|
|
func (cc *CertificateController) updateCertificateRequestStatus(csr *certificates.CertificateSigningRequest) error {
|
|
_, updateErr := cc.kubeClient.Certificates().CertificateSigningRequests().UpdateStatus(csr)
|
|
if updateErr == nil {
|
|
// success!
|
|
return nil
|
|
}
|
|
|
|
// retry on failure
|
|
cc.enqueueCertificateRequest(csr)
|
|
return updateErr
|
|
}
|
|
|
|
// maybeSignCertificate will inspect the certificate request and, if it has
|
|
// been approved and meets policy expectations, generate an X509 cert using the
|
|
// cluster CA assets. If successful it will update the CSR approve subresource
|
|
// with the signed certificate.
|
|
func (cc *CertificateController) maybeSignCertificate(key string) error {
|
|
startTime := time.Now()
|
|
defer func() {
|
|
glog.V(4).Infof("Finished syncing certificate request %q (%v)", key, time.Now().Sub(startTime))
|
|
}()
|
|
obj, exists, err := cc.csrStore.Store.GetByKey(key)
|
|
if err != nil {
|
|
cc.queue.Add(key)
|
|
return err
|
|
}
|
|
if !exists {
|
|
glog.V(3).Infof("csr has been deleted: %v", key)
|
|
return nil
|
|
}
|
|
csr := obj.(*certificates.CertificateSigningRequest)
|
|
|
|
csr, err = cc.maybeAutoApproveCSR(csr)
|
|
if err != nil {
|
|
return fmt.Errorf("error auto approving csr: %v", err)
|
|
}
|
|
|
|
// At this point, the controller needs to:
|
|
// 1. Check the approval conditions
|
|
// 2. Generate a signed certificate
|
|
// 3. Update the Status subresource
|
|
|
|
if csr.Status.Certificate == nil && IsCertificateRequestApproved(csr) {
|
|
pemBytes := csr.Spec.Request
|
|
req := signer.SignRequest{Request: string(pemBytes)}
|
|
certBytes, err := cc.signer.Sign(req)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
csr.Status.Certificate = certBytes
|
|
}
|
|
|
|
return cc.updateCertificateRequestStatus(csr)
|
|
}
|
|
|
|
func (cc *CertificateController) maybeAutoApproveCSR(csr *certificates.CertificateSigningRequest) (*certificates.CertificateSigningRequest, error) {
|
|
// short-circuit if we're not auto-approving
|
|
if cc.approveAllKubeletCSRsForGroup == "" {
|
|
return csr, nil
|
|
}
|
|
// short-circuit if we're already approved or denied
|
|
if approved, denied := getCertApprovalCondition(&csr.Status); approved || denied {
|
|
return csr, nil
|
|
}
|
|
|
|
isKubeletBootstrapGroup := false
|
|
for _, g := range csr.Spec.Groups {
|
|
if g == cc.approveAllKubeletCSRsForGroup {
|
|
isKubeletBootstrapGroup = true
|
|
break
|
|
}
|
|
}
|
|
if !isKubeletBootstrapGroup {
|
|
return csr, nil
|
|
}
|
|
|
|
x509cr, err := utilcertificates.ParseCertificateRequestObject(csr)
|
|
if err != nil {
|
|
glog.Errorf("unable to parse csr %q: %v", csr.ObjectMeta.Name, err)
|
|
return csr, nil
|
|
}
|
|
if !reflect.DeepEqual([]string{"system:nodes"}, x509cr.Subject.Organization) {
|
|
return csr, nil
|
|
}
|
|
if !strings.HasPrefix(x509cr.Subject.CommonName, "system:node:") {
|
|
return csr, nil
|
|
}
|
|
if len(x509cr.DNSNames)+len(x509cr.EmailAddresses)+len(x509cr.IPAddresses) != 0 {
|
|
return csr, nil
|
|
}
|
|
|
|
csr.Status.Conditions = append(csr.Status.Conditions, certificates.CertificateSigningRequestCondition{
|
|
Type: certificates.CertificateApproved,
|
|
Reason: "AutoApproved",
|
|
Message: "Auto approving of all kubelet CSRs is enabled on the controller manager",
|
|
})
|
|
return cc.kubeClient.Certificates().CertificateSigningRequests().UpdateApproval(csr)
|
|
}
|