132 lines
4.3 KiB
Go
132 lines
4.3 KiB
Go
// Copyright 2020 the Pinniped contributors. All Rights Reserved.
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// SPDX-License-Identifier: Apache-2.0
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package apicerts
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import (
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"crypto/x509/pkix"
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"fmt"
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"time"
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corev1 "k8s.io/api/core/v1"
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k8serrors "k8s.io/apimachinery/pkg/api/errors"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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corev1informers "k8s.io/client-go/informers/core/v1"
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"k8s.io/client-go/kubernetes"
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"k8s.io/klog/v2"
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"go.pinniped.dev/internal/certauthority"
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pinnipedcontroller "go.pinniped.dev/internal/controller"
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"go.pinniped.dev/internal/controllerlib"
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)
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const (
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//nolint: gosec
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certsSecretName = "api-serving-cert"
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caCertificateSecretKey = "caCertificate"
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tlsPrivateKeySecretKey = "tlsPrivateKey"
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tlsCertificateChainSecretKey = "tlsCertificateChain"
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)
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type certsManagerController struct {
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namespace string
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k8sClient kubernetes.Interface
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secretInformer corev1informers.SecretInformer
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// certDuration is the lifetime of both the serving certificate and its CA
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// certificate that this controller will use when issuing the certificates.
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certDuration time.Duration
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generatedCACommonName string
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serviceNameForGeneratedCertCommonName string
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}
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func NewCertsManagerController(namespace string,
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k8sClient kubernetes.Interface,
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secretInformer corev1informers.SecretInformer,
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withInformer pinnipedcontroller.WithInformerOptionFunc,
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withInitialEvent pinnipedcontroller.WithInitialEventOptionFunc,
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certDuration time.Duration,
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generatedCACommonName string,
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serviceNameForGeneratedCertCommonName string,
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) controllerlib.Controller {
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return controllerlib.New(
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controllerlib.Config{
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Name: "certs-manager-controller",
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Syncer: &certsManagerController{
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namespace: namespace,
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k8sClient: k8sClient,
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secretInformer: secretInformer,
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certDuration: certDuration,
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generatedCACommonName: generatedCACommonName,
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serviceNameForGeneratedCertCommonName: serviceNameForGeneratedCertCommonName,
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},
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},
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withInformer(
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secretInformer,
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pinnipedcontroller.NameAndNamespaceExactMatchFilterFactory(certsSecretName, namespace),
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controllerlib.InformerOption{},
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),
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// Be sure to run once even if the Secret that the informer is watching doesn't exist.
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withInitialEvent(controllerlib.Key{
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Namespace: namespace,
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Name: certsSecretName,
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}),
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)
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}
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func (c *certsManagerController) Sync(ctx controllerlib.Context) error {
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// Try to get the secret from the informer cache.
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_, err := c.secretInformer.Lister().Secrets(c.namespace).Get(certsSecretName)
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notFound := k8serrors.IsNotFound(err)
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if err != nil && !notFound {
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return fmt.Errorf("failed to get %s/%s secret: %w", c.namespace, certsSecretName, err)
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}
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if !notFound {
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// The secret already exists, so nothing to do.
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return nil
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}
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// Create a CA.
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aggregatedAPIServerCA, err := certauthority.New(pkix.Name{CommonName: c.generatedCACommonName}, c.certDuration)
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if err != nil {
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return fmt.Errorf("could not initialize CA: %w", err)
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}
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// Using the CA from above, create a TLS server cert for the aggregated API server to use.
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serviceEndpoint := c.serviceNameForGeneratedCertCommonName + "." + c.namespace + ".svc"
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aggregatedAPIServerTLSCert, err := aggregatedAPIServerCA.Issue(
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pkix.Name{CommonName: serviceEndpoint},
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[]string{serviceEndpoint},
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c.certDuration,
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)
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if err != nil {
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return fmt.Errorf("could not issue serving certificate: %w", err)
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}
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// Write the CA's public key bundle and the serving certs to a secret.
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tlsCertChainPEM, tlsPrivateKeyPEM, err := certauthority.ToPEM(aggregatedAPIServerTLSCert)
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if err != nil {
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return fmt.Errorf("could not PEM encode serving certificate: %w", err)
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}
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secret := corev1.Secret{
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TypeMeta: metav1.TypeMeta{},
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ObjectMeta: metav1.ObjectMeta{
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Name: certsSecretName,
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Namespace: c.namespace,
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},
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StringData: map[string]string{
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caCertificateSecretKey: string(aggregatedAPIServerCA.Bundle()),
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tlsPrivateKeySecretKey: string(tlsPrivateKeyPEM),
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tlsCertificateChainSecretKey: string(tlsCertChainPEM),
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},
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}
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_, err = c.k8sClient.CoreV1().Secrets(c.namespace).Create(ctx.Context, &secret, metav1.CreateOptions{})
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if err != nil {
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return fmt.Errorf("could not create secret: %w", err)
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}
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klog.Info("certsManagerController Sync successfully created secret")
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return nil
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}
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