syncthing/tls.go
2013-12-15 11:43:40 +01:00

69 lines
1.6 KiB
Go

package main
import (
"crypto/rand"
"crypto/rsa"
"crypto/sha1"
"crypto/tls"
"crypto/x509"
"crypto/x509/pkix"
"encoding/base32"
"encoding/pem"
"math/big"
"os"
"path"
"time"
)
const (
tlsRSABits = 2048
tlsName = "syncthing"
)
func loadCert(dir string) (tls.Certificate, error) {
return tls.LoadX509KeyPair(path.Join(dir, "cert.pem"), path.Join(dir, "key.pem"))
}
func certId(bs []byte) string {
hf := sha1.New()
hf.Write(bs)
id := hf.Sum(nil)
return base32.StdEncoding.EncodeToString(id)
}
func newCertificate(dir string) {
priv, err := rsa.GenerateKey(rand.Reader, tlsRSABits)
fatalErr(err)
notBefore := time.Now()
notAfter := time.Date(2049, 12, 31, 23, 59, 59, 0, time.UTC)
template := x509.Certificate{
SerialNumber: new(big.Int).SetInt64(0),
Subject: pkix.Name{
CommonName: tlsName,
},
NotBefore: notBefore,
NotAfter: notAfter,
KeyUsage: x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature,
ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth},
BasicConstraintsValid: true,
}
derBytes, err := x509.CreateCertificate(rand.Reader, &template, &template, &priv.PublicKey, priv)
fatalErr(err)
certOut, err := os.Create(path.Join(dir, "cert.pem"))
fatalErr(err)
pem.Encode(certOut, &pem.Block{Type: "CERTIFICATE", Bytes: derBytes})
certOut.Close()
okln("wrote cert.pem")
keyOut, err := os.OpenFile(path.Join(dir, "key.pem"), os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0600)
fatalErr(err)
pem.Encode(keyOut, &pem.Block{Type: "RSA PRIVATE KEY", Bytes: x509.MarshalPKCS1PrivateKey(priv)})
keyOut.Close()
okln("wrote key.pem")
}