mirror of https://github.com/knative/pkg.git
108 lines
3.5 KiB
Go
108 lines
3.5 KiB
Go
/*
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Copyright 2019 The Knative Authors
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package certificates
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import (
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"context"
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"crypto/tls"
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"crypto/x509"
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"time"
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apierrors "k8s.io/apimachinery/pkg/api/errors"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/apimachinery/pkg/types"
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"k8s.io/client-go/kubernetes"
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corelisters "k8s.io/client-go/listers/core/v1"
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"knative.dev/pkg/controller"
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"knative.dev/pkg/logging"
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pkgreconciler "knative.dev/pkg/reconciler"
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certresources "knative.dev/pkg/webhook/certificates/resources"
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)
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const (
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// Time used for updating a certificate before it expires.
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oneWeek = 7 * 24 * time.Hour
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)
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type reconciler struct {
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pkgreconciler.LeaderAwareFuncs
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client kubernetes.Interface
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secretlister corelisters.SecretLister
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key types.NamespacedName
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serviceName string
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}
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var _ controller.Reconciler = (*reconciler)(nil)
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var _ pkgreconciler.LeaderAware = (*reconciler)(nil)
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// Reconcile implements controller.Reconciler
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func (r *reconciler) Reconcile(ctx context.Context, key string) error {
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if r.IsLeaderFor(r.key) {
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// only reconciler the certificate when we are leader.
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return r.reconcileCertificate(ctx)
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}
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return nil
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}
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func (r *reconciler) reconcileCertificate(ctx context.Context) error {
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logger := logging.FromContext(ctx)
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secret, err := r.secretlister.Secrets(r.key.Namespace).Get(r.key.Name)
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if apierrors.IsNotFound(err) {
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// The secret should be created explicitly by a higher-level system
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// that's responsible for install/updates. We simply populate the
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// secret information.
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return nil
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} else if err != nil {
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logger.Errorf("Error accessing certificate secret %q: %v", r.key.Name, err)
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return err
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}
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if _, haskey := secret.Data[certresources.ServerKey]; !haskey {
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logger.Infof("Certificate secret %q is missing key %q", r.key.Name, certresources.ServerKey)
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} else if _, haskey := secret.Data[certresources.ServerCert]; !haskey {
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logger.Infof("Certificate secret %q is missing key %q", r.key.Name, certresources.ServerCert)
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} else if _, haskey := secret.Data[certresources.CACert]; !haskey {
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logger.Infof("Certificate secret %q is missing key %q", r.key.Name, certresources.CACert)
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} else {
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// Check the expiration date of the certificate to see if it needs to be updated
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cert, err := tls.X509KeyPair(secret.Data[certresources.ServerCert], secret.Data[certresources.ServerKey])
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if err != nil {
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logger.Warn("Error creating pem from certificate and key: ", err)
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} else {
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certData, err := x509.ParseCertificate(cert.Certificate[0])
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if err != nil {
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logger.Error("Error parsing certificate: ", err)
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} else if time.Now().Add(oneWeek).Before(certData.NotAfter) {
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return nil
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}
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}
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}
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// Don't modify the informer copy.
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secret = secret.DeepCopy()
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// One of the secret's keys is missing, so synthesize a new one and update the secret.
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newSecret, err := certresources.MakeSecret(ctx, r.key.Name, r.key.Namespace, r.serviceName)
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if err != nil {
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return err
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}
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secret.Data = newSecret.Data
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_, err = r.client.CoreV1().Secrets(secret.Namespace).Update(ctx, secret, metav1.UpdateOptions{})
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return err
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}
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