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crud.go
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crud.go
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package providers
import (
"context"
"crypto/x509"
"fmt"
"time"
reconcilerutil "github.com/3scale-ops/basereconciler/util"
operatorv1alpha1 "github.com/3scale-ops/marin3r/apis/operator.marin3r/v1alpha1"
"github.com/3scale-ops/marin3r/pkg/util/pki"
"github.com/go-logr/logr"
corev1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/types"
"sigs.k8s.io/controller-runtime/pkg/client"
"sigs.k8s.io/controller-runtime/pkg/controller/controllerutil"
)
const (
tlsCertificateKey = "tls.crt"
tlsPrivateKeyKey = "tls.key"
)
// CertificateProvider is the operator internal certificate
// provider
type CertificateProvider struct {
ctx context.Context
logger logr.Logger
client client.Client
scheme *runtime.Scheme
dsc *operatorv1alpha1.DiscoveryServiceCertificate
}
// NewCertificateProvider returns a CertificateProvider struct for the given parameters
func NewCertificateProvider(ctx context.Context, logger logr.Logger, client client.Client,
scheme *runtime.Scheme, dsc *operatorv1alpha1.DiscoveryServiceCertificate) *CertificateProvider {
return &CertificateProvider{
ctx: ctx,
logger: logger,
client: client,
scheme: scheme,
dsc: dsc,
}
}
// CreateCertificate creates a certificate with the config options defined
// in the spec of the DiscoveryServiceCertificate
func (cp *CertificateProvider) CreateCertificate() ([]byte, []byte, error) {
logger := cp.logger.WithValues("method", "CreateCertificate")
issuerCert, issuerKey, err := cp.getIssuerCertificate()
if err != nil {
logger.Error(err, "unable to get issuer certificate")
return nil, nil, err
}
secret := &corev1.Secret{}
key := types.NamespacedName{
Name: cp.dsc.Spec.SecretRef.Name,
Namespace: cp.dsc.GetNamespace(),
}
err = cp.client.Get(cp.ctx, key, secret)
if err == nil {
logger.Error(fmt.Errorf("secret %s already exists", reconcilerutil.ObjectKey(secret)), "secret already exists")
return nil, nil, fmt.Errorf("secret %s already exists", reconcilerutil.ObjectKey(secret))
} else if !errors.IsNotFound(err) {
logger.Error(err, "unable to get Secret")
return nil, nil, err
}
secret, err = cp.genSecret(issuerCert, issuerKey)
if err != nil {
logger.Error(err, "unable to generate Secret for certificate")
return nil, nil, err
}
if err := controllerutil.SetControllerReference(cp.dsc, secret, cp.scheme); err != nil {
logger.Error(err, "unable to SetControllerReference on Secret for certificate")
return nil, nil, err
}
if err := cp.client.Create(cp.ctx, secret); err != nil {
logger.Error(err, "unable to create Secret for certificate")
return nil, nil, err
}
logger.V(1).Info("created certificate")
return secret.Data[tlsCertificateKey], secret.Data[tlsPrivateKeyKey], nil
}
// GetCertificate loads a certificate form the Secret referred in the
// DiscoveryServiceCertificate resource
func (cp *CertificateProvider) GetCertificate() ([]byte, []byte, error) {
logger := cp.logger.WithValues("method", "GetCertificate")
secret := &corev1.Secret{}
key := types.NamespacedName{
Name: cp.dsc.Spec.SecretRef.Name,
Namespace: cp.dsc.GetNamespace(),
}
err := cp.client.Get(cp.ctx, key, secret)
if err != nil {
logger.Error(err, "unable to get Secret")
return nil, nil, err
}
return secret.Data[tlsCertificateKey], secret.Data[tlsPrivateKeyKey], nil
}
// UpdateCertificate updates the certificate stored in the Secret referred
// in the DiscoveryServiceCertificate resource
func (cp *CertificateProvider) UpdateCertificate() ([]byte, []byte, error) {
logger := cp.logger.WithValues("method", "UpdateCertificate")
issuerCert, issuerKey, err := cp.getIssuerCertificate()
if err != nil {
logger.Error(err, "unable to get issuer certificate")
return nil, nil, err
}
secret := &corev1.Secret{}
key := types.NamespacedName{
Name: cp.dsc.Spec.SecretRef.Name,
Namespace: cp.dsc.GetNamespace(),
}
err = cp.client.Get(cp.ctx, key, secret)
if err != nil {
logger.Error(err, "unable to get Secret")
return nil, nil, err
}
newPayload, err := cp.genSecret(issuerCert, issuerKey)
if err != nil {
logger.Error(err, "unable to generate new payload for certificate")
return nil, nil, err
}
secret.Data = newPayload.Data
if err := cp.client.Update(cp.ctx, secret); err != nil {
logger.Error(err, "unable to update Secret for certificate")
return nil, nil, err
}
logger.V(1).Info("updated certificate")
return secret.Data[tlsCertificateKey], secret.Data[tlsPrivateKeyKey], nil
}
// VerifyCertificate verifies the validity of a certificate. Returns
// 'nil' if verification is correct, an error otherwise.
func (cp *CertificateProvider) VerifyCertificate() error {
logger := cp.logger.WithValues("method", "VerifyCertificate")
secret := &corev1.Secret{}
key := types.NamespacedName{
Name: cp.dsc.Spec.SecretRef.Name,
Namespace: cp.dsc.GetNamespace(),
}
err := cp.client.Get(cp.ctx, key, secret)
if err != nil {
logger.Error(err, "unable to get Secret")
return err
}
var cert *x509.Certificate
cert, err = pki.LoadX509Certificate(secret.Data[tlsCertificateKey])
if err != nil {
logger.Error(err, "unable to load certificate from Secret")
return err
}
var root *x509.Certificate
if cp.dsc.Spec.Signer.CASigned != nil {
root, _, err = cp.getIssuerCertificate()
if err != nil {
logger.Error(err, "unable to get issuer certificate")
return err
}
}
// If root is 'nil' it is a self-signed certificate that must be
// verified against itself
if root == nil {
root = cert
}
return pki.Verify(cert, root)
}
// getIssuerCertificate returns the issuer certificate for a DiscoveryServiceCertificate resource
func (cp *CertificateProvider) getIssuerCertificate() (*x509.Certificate, interface{}, error) {
if cp.dsc.Spec.Signer.CASigned != nil {
secret := &corev1.Secret{}
key := types.NamespacedName{
Name: cp.dsc.Spec.Signer.CASigned.SecretRef.Name,
Namespace: cp.dsc.Spec.Signer.CASigned.SecretRef.Namespace,
}
if err := cp.client.Get(cp.ctx, key, secret); err != nil {
return nil, nil, err
}
cert, err := pki.LoadX509Certificate(secret.Data[tlsCertificateKey])
if err != nil {
return nil, nil, err
}
privKey, err := pki.DecodePrivateKeyBytes(secret.Data[tlsPrivateKeyKey])
if err != nil {
return nil, nil, err
}
return cert, privKey, nil
}
return nil, nil, nil
}
func (cp *CertificateProvider) genSecret(issuerCert *x509.Certificate, issuerKey interface{}) (*corev1.Secret, error) {
crt, key, err := pki.GenerateCertificate(
issuerCert,
issuerKey,
cp.dsc.Spec.CommonName,
time.Duration(cp.dsc.Spec.ValidFor)*time.Second,
cp.dsc.IsServerCertificate(),
cp.dsc.IsCA(),
cp.dsc.GetHosts()...,
)
if err != nil {
return nil, err
}
secret := &corev1.Secret{
ObjectMeta: metav1.ObjectMeta{
Name: cp.dsc.Spec.SecretRef.Name,
Namespace: cp.dsc.GetNamespace(),
},
Type: corev1.SecretTypeTLS,
Data: map[string][]byte{tlsCertificateKey: crt, tlsPrivateKeyKey: key},
}
return secret, err
}