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/
gencert.go
123 lines (107 loc) · 3 KB
/
gencert.go
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package crypto
import (
"crypto/ecdsa"
"crypto/rand"
"crypto/rsa"
"crypto/x509"
"crypto/x509/pkix"
"encoding/pem"
"math/big"
"net"
"os"
"time"
"github.com/owncloud/ocis-pkg/v2/log"
)
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{}, l log.Logger) *pem.Block {
switch k := priv.(type) {
case *rsa.PrivateKey:
return &pem.Block{Type: "RSA PRIVATE KEY", Bytes: x509.MarshalPKCS1PrivateKey(k)}
case *ecdsa.PrivateKey:
b, err := x509.MarshalECPrivateKey(k)
if err != nil {
l.Fatal().Err(err).Msg("Unable to marshal ECDSA private key")
}
return &pem.Block{Type: "EC PRIVATE KEY", Bytes: b}
default:
return nil
}
}
// GenCert generates TLS-Certificates
func GenCert(l log.Logger) error {
var priv interface{}
var err error
priv, err = rsa.GenerateKey(rand.Reader, 2048)
if err != nil {
l.Fatal().Err(err).Msg("Failed to generate private key")
}
notBefore := time.Now()
notAfter := notBefore.Add(24 * time.Hour * 365)
serialNumberLimit := new(big.Int).Lsh(big.NewInt(1), 128)
serialNumber, err := rand.Int(rand.Reader, serialNumberLimit)
if err != nil {
l.Fatal().Err(err).Msg("Failed to generate serial number")
}
template := x509.Certificate{
SerialNumber: serialNumber,
Subject: pkix.Name{
Organization: []string{"Acme Corp"},
CommonName: "OCIS",
},
NotBefore: notBefore,
NotAfter: notAfter,
KeyUsage: x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature,
ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth},
BasicConstraintsValid: true,
}
hosts := []string{"127.0.0.1", "localhost"}
for _, h := range hosts {
if ip := net.ParseIP(h); ip != nil {
template.IPAddresses = append(template.IPAddresses, ip)
} else {
template.DNSNames = append(template.DNSNames, h)
}
}
//template.IsCA = true
//template.KeyUsage |= x509.KeyUsageCertSign
derBytes, err := x509.CreateCertificate(rand.Reader, &template, &template, publicKey(priv), priv)
if err != nil {
l.Fatal().Err(err).Msg("Failed to create certificate")
}
certOut, err := os.Create("server.crt")
if err != nil {
l.Fatal().Err(err).Msg("Failed to open server.crt for writing")
}
err = pem.Encode(certOut, &pem.Block{Type: "CERTIFICATE", Bytes: derBytes})
if err != nil {
l.Fatal().Err(err).Msg("Failed to encode certificate")
}
err = certOut.Close()
if err != nil {
l.Fatal().Err(err).Msg("Failed to write cert")
}
l.Info().Msg("Written server.crt")
keyOut, err := os.OpenFile("server.key", os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0600)
if err != nil {
l.Fatal().Err(err).Msg("Failed to open server.key for writing")
}
err = pem.Encode(keyOut, pemBlockForKey(priv, l))
if err != nil {
l.Fatal().Err(err).Msg("Failed to encode key")
}
err = keyOut.Close()
if err != nil {
l.Fatal().Err(err).Msg("Failed to write key")
}
l.Info().Msg("Written server.key")
return nil
}