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tls.go
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tls.go
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package tls
import (
"bytes"
"crypto/rand"
"crypto/rsa"
"crypto/x509"
"crypto/x509/pkix"
"encoding/pem"
"fmt"
"math/big"
"time"
"github.com/pkg/errors"
)
var validityNotAfter = time.Date(9999, 12, 31, 23, 59, 59, 0, time.UTC)
// Issue returns CA certificate, TLS certificate and TLS private key
func Issue(hosts []string) (caCert []byte, tlsCert []byte, tlsKey []byte, err error) {
rsaBits := 2048
priv, err := rsa.GenerateKey(rand.Reader, rsaBits)
if err != nil {
return nil, nil, nil, fmt.Errorf("generate rsa key: %v", err)
}
serialNumberLimit := new(big.Int).Lsh(big.NewInt(1), 128)
serialNumber, err := rand.Int(rand.Reader, serialNumberLimit)
if err != nil {
return nil, nil, nil, errors.Wrap(err, "generate serial number for root")
}
subject := pkix.Name{
Organization: []string{"Root CA"},
}
issuer := pkix.Name{
Organization: []string{"Root CA"},
}
caTemplate := x509.Certificate{
SerialNumber: serialNumber,
Subject: subject,
NotBefore: time.Now(),
NotAfter: validityNotAfter,
KeyUsage: x509.KeyUsageCertSign | x509.KeyUsageKeyEncipherment,
ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth, x509.ExtKeyUsageClientAuth, x509.ExtKeyUsageCodeSigning},
BasicConstraintsValid: true,
IsCA: true,
}
derBytes, err := x509.CreateCertificate(rand.Reader, &caTemplate, &caTemplate, &priv.PublicKey, priv)
if err != nil {
return nil, nil, nil, fmt.Errorf("generate CA certificate: %v", err)
}
certOut := &bytes.Buffer{}
err = pem.Encode(certOut, &pem.Block{Type: "CERTIFICATE", Bytes: derBytes})
if err != nil {
return nil, nil, nil, fmt.Errorf("encode CA certificate: %v", err)
}
cert := certOut.Bytes()
serialNumber, err = rand.Int(rand.Reader, serialNumberLimit)
if err != nil {
return nil, nil, nil, errors.Wrap(err, "generate serial number for client")
}
subject = pkix.Name{
Organization: []string{"PXC"},
}
tlsTemplate := x509.Certificate{
SerialNumber: serialNumber,
Subject: subject,
Issuer: issuer,
NotBefore: time.Now(),
NotAfter: validityNotAfter,
DNSNames: hosts,
KeyUsage: x509.KeyUsageDigitalSignature | x509.KeyUsageKeyEncipherment,
ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth, x509.ExtKeyUsageClientAuth},
BasicConstraintsValid: true,
IsCA: false,
}
clientKey, err := rsa.GenerateKey(rand.Reader, 2048)
if err != nil {
return nil, nil, nil, errors.Wrap(err, "generate client key")
}
tlsDerBytes, err := x509.CreateCertificate(rand.Reader, &tlsTemplate, &caTemplate, &clientKey.PublicKey, priv)
if err != nil {
return nil, nil, nil, err
}
tlsCertOut := &bytes.Buffer{}
err = pem.Encode(tlsCertOut, &pem.Block{Type: "CERTIFICATE", Bytes: tlsDerBytes})
if err != nil {
return nil, nil, nil, fmt.Errorf("encode TLS certificate: %v", err)
}
tlsCert = tlsCertOut.Bytes()
keyOut := &bytes.Buffer{}
block := &pem.Block{Type: "RSA PRIVATE KEY", Bytes: x509.MarshalPKCS1PrivateKey(clientKey)}
err = pem.Encode(keyOut, block)
if err != nil {
return nil, nil, nil, fmt.Errorf("encode RSA private key: %v", err)
}
privKey := keyOut.Bytes()
return cert, tlsCert, privKey, nil
}