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tls.go
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tls.go
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// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Generate a self-signed X.509 certificate for a TLS server. Outputs to
// 'cert.pem' and 'key.pem' and will overwrite existing files.
package e2eutil
import (
"crypto/ecdsa"
"crypto/rand"
"crypto/rsa"
"crypto/x509"
"crypto/x509/pkix"
"encoding/pem"
"errors"
"fmt"
"io/ioutil"
"math/big"
"net"
"os"
"os/exec"
"path/filepath"
"strings"
"time"
)
func PreparePeerTLSSecret(clusterName, ns, secretName string) error {
dir, err := ioutil.TempDir("", "etcd-operator-tls-")
if err != nil {
return err
}
defer os.RemoveAll(dir)
certPath := filepath.Join(dir, "peer-crt.pem")
keyPath := filepath.Join(dir, "peer-key.pem")
caPath := filepath.Join(dir, "peer-ca-crt.pem")
err = preparePeerTLSCerts(certPath, keyPath, caPath, clusterName, ns)
if err != nil {
return err
}
cmd := exec.Command("kubectl", "-n", ns, "create", "secret", "generic", secretName,
fmt.Sprintf("--from-file=%s", caPath),
fmt.Sprintf("--from-file=%s", certPath),
fmt.Sprintf("--from-file=%s", keyPath),
)
return cmd.Run()
}
func preparePeerTLSCerts(certPath, keyPath, caPath, clusterName, ns string) error {
err := prepareTLSCerts(certPath, keyPath, fmt.Sprintf("*.%s.%s.svc.cluster.local", clusterName, ns))
if err != nil {
return err
}
b, err := ioutil.ReadFile(certPath)
if err != nil {
return err
}
return ioutil.WriteFile(caPath, b, 0644)
}
// prepareTLSCerts creates self-signed self-CA x509 cert and key files.
// The files are written as given certPath and keyPath respectively.
// hosts: Comma-separated hostnames and IPs to generate a certificate for.
func prepareTLSCerts(certPath, keyPath, hosts string) error {
priv, err := rsa.GenerateKey(rand.Reader, 2048)
if err != nil {
return fmt.Errorf("failed to generate private key: %v", err)
}
notBefore := time.Now()
notAfter := notBefore.Add(2 * time.Hour)
serialNumberLimit := new(big.Int).Lsh(big.NewInt(1), 128)
serialNumber, err := rand.Int(rand.Reader, serialNumberLimit)
if err != nil {
return fmt.Errorf("failed to generate serial number: %v", err)
}
template := x509.Certificate{
SerialNumber: serialNumber,
Subject: pkix.Name{
Organization: []string{"Etcd Operator Example"},
},
NotBefore: notBefore,
NotAfter: notAfter,
IsCA: true,
KeyUsage: x509.KeyUsageCertSign | x509.KeyUsageDigitalSignature,
ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth, x509.ExtKeyUsageClientAuth},
BasicConstraintsValid: true,
}
hostList := strings.Split(hosts, ",")
for _, h := range hostList {
if ip := net.ParseIP(h); ip != nil {
template.IPAddresses = append(template.IPAddresses, ip)
} else {
template.DNSNames = append(template.DNSNames, h)
}
}
derBytes, err := x509.CreateCertificate(rand.Reader, &template, &template, publicKey(priv), priv)
if err != nil {
return fmt.Errorf("Failed to create certificate: %v", err)
}
certOut, err := os.Create(certPath)
if err != nil {
return fmt.Errorf("failed to open cert.pem for writing: %v", err)
}
pem.Encode(certOut, &pem.Block{Type: "CERTIFICATE", Bytes: derBytes})
certOut.Close()
keyOut, err := os.OpenFile(keyPath, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0600)
if err != nil {
return fmt.Errorf("failed to open key.pem for writing: %v", err)
}
pb, err := pemBlockForKey(priv)
if err != nil {
return err
}
pem.Encode(keyOut, pb)
keyOut.Close()
return nil
}
func publicKey(priv interface{}) interface{} {
switch k := priv.(type) {
case *rsa.PrivateKey:
return &k.PublicKey
case *ecdsa.PrivateKey:
return &k.PublicKey
default:
return nil
}
}
func pemBlockForKey(priv interface{}) (*pem.Block, error) {
switch k := priv.(type) {
case *rsa.PrivateKey:
return &pem.Block{Type: "RSA PRIVATE KEY", Bytes: x509.MarshalPKCS1PrivateKey(k)}, nil
case *ecdsa.PrivateKey:
b, err := x509.MarshalECPrivateKey(k)
if err != nil {
return nil, fmt.Errorf("Unable to marshal ECDSA private key: %v", err)
}
return &pem.Block{Type: "EC PRIVATE KEY", Bytes: b}, nil
default:
return nil, errors.New("unknown private key type")
}
}