/
controller.go
203 lines (175 loc) · 5.65 KB
/
controller.go
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package certificate
import (
"context"
"fmt"
"time"
"github.com/mariadb-operator/mariadb-operator/pkg/pki"
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/types"
"sigs.k8s.io/controller-runtime/pkg/client"
)
var (
defaultCAValidityDuration = 4 * 365 * 24 * time.Hour
defaultCertValidityDuration = 365 * 24 * time.Hour
defaultLookaheadValidity = 90 * 24 * time.Hour
)
type CertReconcilerOpts struct {
caSecretKey types.NamespacedName
caCommonName string
caValidity time.Duration
certSecretKey types.NamespacedName
certCommonName string
certDNSNames []string
certValidity time.Duration
lookaheadValidity time.Duration
}
type CertReconcilerOpt func(opts *CertReconcilerOpts)
func WithCAValidity(validity time.Duration) CertReconcilerOpt {
return func(opts *CertReconcilerOpts) {
opts.caValidity = validity
}
}
func WithCertValidity(validity time.Duration) CertReconcilerOpt {
return func(opts *CertReconcilerOpts) {
opts.certValidity = validity
}
}
func WithLookaheadValidity(validity time.Duration) CertReconcilerOpt {
return func(opts *CertReconcilerOpts) {
opts.lookaheadValidity = validity
}
}
type CertReconciler struct {
client.Client
CertReconcilerOpts
}
func NewCertReconciler(client client.Client, caSecretKey types.NamespacedName, caCommonName string,
certSecretKey types.NamespacedName, certCommonName string, certDNSNames []string,
reconcilerOpts ...CertReconcilerOpt) *CertReconciler {
opts := CertReconcilerOpts{
caSecretKey: caSecretKey,
caCommonName: caCommonName,
caValidity: defaultCAValidityDuration,
certSecretKey: certSecretKey,
certCommonName: certCommonName,
certValidity: defaultCertValidityDuration,
certDNSNames: certDNSNames,
lookaheadValidity: defaultLookaheadValidity,
}
for _, setOpt := range reconcilerOpts {
setOpt(&opts)
}
return &CertReconciler{
Client: client,
CertReconcilerOpts: opts,
}
}
type ReconcileResult struct {
CAKeyPair *pki.KeyPair
CertKeyPair *pki.KeyPair
RefreshedCA bool
RefreshedCert bool
}
func (r *CertReconciler) Reconcile(ctx context.Context) (*ReconcileResult, error) {
result := &ReconcileResult{}
var err error
result.CAKeyPair, result.RefreshedCA, err = r.reconcileKeyPair(ctx, r.caSecretKey, false, r.createCA)
if err != nil {
return nil, fmt.Errorf("Error reconciling CA KeyPair: %v", err)
}
valid, err := pki.ValidCACert(result.CAKeyPair, r.caCommonName, r.lookaheadTime())
if !valid || err != nil {
result.CAKeyPair, result.RefreshedCA, err = r.reconcileKeyPair(ctx, r.caSecretKey, true, r.createCA)
if err != nil {
return nil, fmt.Errorf("Error reconciling CA KeyPair: %v", err)
}
}
createCert := r.createCertFn(result.CAKeyPair)
result.CertKeyPair, result.RefreshedCert, err = r.reconcileKeyPair(ctx, r.certSecretKey, false, createCert)
if err != nil {
return nil, fmt.Errorf("Error reconciling certificate KeyPair: %v", err)
}
valid, err = pki.ValidCert(result.CAKeyPair.Cert, result.CertKeyPair, r.certCommonName, r.lookaheadTime())
if result.RefreshedCA || !valid || err != nil {
result.CertKeyPair, result.RefreshedCert, err = r.reconcileKeyPair(ctx, r.certSecretKey, true, createCert)
if err != nil {
return nil, fmt.Errorf("Error reconciling certificate KeyPair: %v", err)
}
}
return result, nil
}
func (r *CertReconciler) reconcileKeyPair(ctx context.Context, key types.NamespacedName, refresh bool,
createKeyPairFn func() (*pki.KeyPair, error)) (keyPair *pki.KeyPair, refreshed bool, err error) {
secret := corev1.Secret{}
if err := r.Get(ctx, key, &secret); err != nil {
if !apierrors.IsNotFound(err) {
return nil, false, err
}
keyPair, err := createKeyPairFn()
if err != nil {
return nil, false, err
}
if err := r.createSecret(ctx, key, &secret, keyPair); err != nil {
return nil, false, err
}
return keyPair, true, nil
}
if secret.Data == nil || refresh {
keyPair, err := createKeyPairFn()
if err != nil {
return nil, false, err
}
if err := r.patchSecret(ctx, &secret, keyPair); err != nil {
return nil, false, err
}
return keyPair, true, nil
}
keyPair, err = pki.KeyPairFromTLSSecret(&secret)
if err != nil {
return nil, false, err
}
return keyPair, false, nil
}
func (r *CertReconciler) createCA() (*pki.KeyPair, error) {
return pki.CreateCA(
pki.WithCommonName(r.caCommonName),
pki.WithNotBefore(time.Now().Add(-1*time.Hour)),
pki.WithNotAfter(time.Now().Add(r.caValidity)),
)
}
func (r *CertReconciler) createCertFn(caKeyPair *pki.KeyPair) func() (*pki.KeyPair, error) {
return func() (*pki.KeyPair, error) {
return pki.CreateCert(
caKeyPair,
pki.WithCommonName(r.certCommonName),
pki.WithDNSNames(r.certDNSNames),
pki.WithNotBefore(time.Now().Add(-1*time.Hour)),
pki.WithNotAfter(time.Now().Add(r.certValidity)),
)
}
}
func (r *CertReconciler) createSecret(ctx context.Context, key types.NamespacedName, secret *corev1.Secret, keyPair *pki.KeyPair) error {
secret.ObjectMeta = metav1.ObjectMeta{
Name: key.Name,
Namespace: key.Namespace,
}
secret.Type = corev1.SecretTypeTLS
keyPair.FillTLSSecret(secret)
if err := r.Create(ctx, secret); err != nil {
return fmt.Errorf("Error creating TLS Secret: %v", err)
}
return nil
}
func (r *CertReconciler) patchSecret(ctx context.Context, secret *corev1.Secret, keyPair *pki.KeyPair) error {
patch := client.MergeFrom(secret.DeepCopy())
keyPair.FillTLSSecret(secret)
if err := r.Patch(ctx, secret, patch); err != nil {
return fmt.Errorf("Error patching TLS Secret: %v", err)
}
return nil
}
func (r *CertReconciler) lookaheadTime() time.Time {
return time.Now().Add(r.lookaheadValidity)
}