forked from hooksie1/cmsnr
/
certificate.go
121 lines (100 loc) · 2.68 KB
/
certificate.go
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package deployment
import (
"bytes"
"context"
"crypto/rand"
"crypto/rsa"
"crypto/x509"
"crypto/x509/pkix"
"encoding/pem"
"fmt"
"k8s.io/client-go/kubernetes"
"math/big"
"time"
corev1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/client-go/rest"
)
func keyToPem(k *rsa.PrivateKey) ([]byte, error) {
data := &pem.Block{Type: "RSA PRIVATE KEY", Bytes: x509.MarshalPKCS1PrivateKey(k)}
var buf bytes.Buffer
if err := pem.Encode(&buf, data); err != nil {
return nil, err
}
return buf.Bytes(), nil
}
func certToPem(cert []byte) ([]byte, error) {
var buf bytes.Buffer
err := pem.Encode(&buf, &pem.Block{Type: "CERTIFICATE", Bytes: cert})
return buf.Bytes(), err
}
func GenerateCertificate(service, namespace string) ([]byte, []byte, error) {
key, err := rsa.GenerateKey(rand.Reader, 2048)
if err != nil {
return nil, nil, err
}
sub := pkix.Name{
CommonName: fmt.Sprintf("%s.%s.svc.cluster.local", service, namespace),
Organization: []string{"cmsnr"},
}
template := x509.Certificate{
SerialNumber: big.NewInt(1),
Subject: sub,
IsCA: false,
SignatureAlgorithm: x509.SHA256WithRSA,
NotBefore: time.Now(),
NotAfter: time.Now().Add(time.Hour * 24 * 3650),
KeyUsage: x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature,
ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth},
DNSNames: []string{
fmt.Sprintf("%s.%s.svc", service, namespace),
fmt.Sprintf("%s.%s", service, namespace),
fmt.Sprintf("%s.%s.svc.cluster.local", service, namespace),
},
}
certificate, err := x509.CreateCertificate(rand.Reader, &template, &template, &key.PublicKey, key)
if err != nil {
return nil, nil, err
}
keyPem, err := keyToPem(key)
if err != nil {
return nil, nil, err
}
certPem, err := certToPem(certificate)
return certPem, keyPem, err
}
func GetCertificate(name, namespace string) ([]byte, error) {
ctx := context.Background()
config, err := rest.InClusterConfig()
if err != nil {
return nil, err
}
clientSet, err := kubernetes.NewForConfig(config)
if err != nil {
return nil, err
}
secret, err := clientSet.CoreV1().Secrets(namespace).Get(ctx, name, metav1.GetOptions{})
if err != nil {
return nil, err
}
return secret.Data["tls.crt"], nil
}
func CertAsSecret(cert, key []byte, name, namespace string) *corev1.Secret {
data := map[string][]byte{
"tls.key": key,
"tls.crt": cert,
}
secret := &corev1.Secret{
TypeMeta: metav1.TypeMeta{
Kind: "Secret",
APIVersion: "v1",
},
ObjectMeta: metav1.ObjectMeta{
Name: name,
Namespace: namespace,
},
Type: corev1.SecretTypeTLS,
Data: data,
}
return secret
}