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tlsconfig.go
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tlsconfig.go
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package pipe
import (
"crypto/ecdsa"
"crypto/rand"
"crypto/rsa"
"crypto/x509"
"crypto/x509/pkix"
"encoding/pem"
"math/big"
"time"
tls "github.com/refraction-networking/utls"
)
// createStubCertificate creates a stub TLS certificate for the pipe server.
// This stub cert is generated when the user does not specify any certificate.
func createStubCertificate(tlsServerName string) (cert *tls.Certificate, err error) {
privateKey, err := rsa.GenerateKey(rand.Reader, 2048)
if err != nil {
return nil, err
}
serialNumberLimit := new(big.Int).Lsh(big.NewInt(1), 128)
serialNumber, err := rand.Int(rand.Reader, serialNumberLimit)
if err != nil {
return nil, err
}
notBefore := time.Now()
notAfter := notBefore.Add(5 * 365 * time.Hour * 24)
template := x509.Certificate{
SerialNumber: serialNumber,
Subject: pkix.Name{
Organization: []string{tlsServerName},
},
NotBefore: notBefore,
NotAfter: notAfter,
KeyUsage: x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature | x509.KeyUsageCertSign,
ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth},
BasicConstraintsValid: true,
IsCA: true,
}
template.DNSNames = append(template.DNSNames, tlsServerName)
derBytes, err := x509.CreateCertificate(rand.Reader, &template, &template, publicKey(privateKey), privateKey)
if err != nil {
return nil, err
}
certPem := pem.EncodeToMemory(&pem.Block{Type: "CERTIFICATE", Bytes: derBytes})
keyPem := pem.EncodeToMemory(&pem.Block{Type: "RSA PRIVATE KEY", Bytes: x509.MarshalPKCS1PrivateKey(privateKey)})
tlsCert, err := tls.X509KeyPair(certPem, keyPem)
if err != nil {
return nil, err
}
return &tlsCert, nil
}
func publicKey(priv any) (pub any) {
switch k := priv.(type) {
case *rsa.PrivateKey:
return &k.PublicKey
case *ecdsa.PrivateKey:
return &k.PublicKey
default:
return nil
}
}