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openshift_apiserver_serving_cert.go
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openshift_apiserver_serving_cert.go
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/*
Copyright 2020 The Kubermatic Kubernetes Platform contributors.
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 resources
import (
"crypto/x509"
"fmt"
"github.com/kubermatic/kubermatic/api/pkg/resources"
"github.com/kubermatic/kubermatic/api/pkg/resources/certificates/triple"
"github.com/kubermatic/kubermatic/api/pkg/resources/reconciling"
corev1 "k8s.io/api/core/v1"
certutil "k8s.io/client-go/util/cert"
)
const (
openshiftAPIServerTLSServingCertSecretName = "openshift-apiserver-serving-cert"
openshiftAPIServerCN = "api.openshift-apiserver.svc"
)
type tlsServingCertCreatorData interface {
GetRootCA() (*triple.KeyPair, error)
}
func OpenShiftTLSServingCertificateCreator(data tlsServingCertCreatorData) reconciling.NamedSecretCreatorGetter {
return func() (string, reconciling.SecretCreator) {
return openshiftAPIServerTLSServingCertSecretName, func(se *corev1.Secret) (*corev1.Secret, error) {
if se.Data == nil {
se.Data = map[string][]byte{}
}
ca, err := data.GetRootCA()
if err != nil {
return nil, fmt.Errorf("failed to get cluster ca: %v", err)
}
altNames := certutil.AltNames{
DNSNames: []string{
"api.openshift-apiserver.svc",
"api.openshift-apiserver.svc.cluster.local",
},
}
if b, exists := se.Data[resources.ApiserverTLSCertSecretKey]; exists {
certs, err := triple.ParseCertsPEM(b)
if err != nil {
return nil, fmt.Errorf("failed to parse certificate (key=%s) from existing secret: %v", resources.ApiserverTLSCertSecretKey, err)
}
if resources.IsServerCertificateValidForAllOf(certs[0], openshiftAPIServerCN, altNames, ca.Cert) {
return se, nil
}
}
key, err := triple.NewPrivateKey()
if err != nil {
return nil, fmt.Errorf("unable to create a server private key: %v", err)
}
config := certutil.Config{
CommonName: openshiftAPIServerCN,
AltNames: altNames,
Usages: []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth},
}
cert, err := triple.NewSignedCert(config, key, ca.Cert, ca.Key)
if err != nil {
return nil, fmt.Errorf("unable to sign the server certificate: %v", err)
}
se.Data[resources.ApiserverTLSKeySecretKey] = triple.EncodePrivateKeyPEM(key)
se.Data[resources.ApiserverTLSCertSecretKey] = triple.EncodeCertPEM(cert)
return se, nil
}
}
}