95 lines
2.3 KiB
Go
95 lines
2.3 KiB
Go
|
package generate
|
||
|
|
|
||
|
|
import (
|
||
|
|
"crypto/rand"
|
||
|
|
"crypto/rsa"
|
||
|
|
"crypto/sha256"
|
||
|
|
"crypto/tls"
|
||
|
|
"crypto/x509"
|
||
|
|
"crypto/x509/pkix"
|
||
|
|
"encoding/hex"
|
||
|
|
"encoding/pem"
|
||
|
|
"fmt"
|
||
|
|
"math/big"
|
||
|
|
"time"
|
||
|
|
)
|
||
|
|
|
||
|
|
// DefaultDomain Traefik domain for the default certificate
|
||
|
|
const DefaultDomain = "TRAEFIK DEFAULT CERT"
|
||
|
|
|
||
|
|
// DefaultCertificate generates random TLS certificates
|
||
|
|
func DefaultCertificate() (*tls.Certificate, error) {
|
||
|
|
randomBytes := make([]byte, 100)
|
||
|
|
_, err := rand.Read(randomBytes)
|
||
|
|
if err != nil {
|
||
|
|
return nil, err
|
||
|
|
}
|
||
|
|
zBytes := sha256.Sum256(randomBytes)
|
||
|
|
z := hex.EncodeToString(zBytes[:sha256.Size])
|
||
|
|
domain := fmt.Sprintf("%s.%s.traefik.default", z[:32], z[32:])
|
||
|
|
|
||
|
|
certPEM, keyPEM, err := KeyPair(domain, time.Time{})
|
||
|
|
if err != nil {
|
||
|
|
return nil, err
|
||
|
|
}
|
||
|
|
|
||
|
|
certificate, err := tls.X509KeyPair(certPEM, keyPEM)
|
||
|
|
if err != nil {
|
||
|
|
return nil, err
|
||
|
|
}
|
||
|
|
|
||
|
|
return &certificate, nil
|
||
|
|
}
|
||
|
|
|
||
|
|
// KeyPair generates cert and key files
|
||
|
|
func KeyPair(domain string, expiration time.Time) ([]byte, []byte, error) {
|
||
|
|
rsaPrivKey, err := rsa.GenerateKey(rand.Reader, 2048)
|
||
|
|
if err != nil {
|
||
|
|
return nil, nil, err
|
||
|
|
}
|
||
|
|
keyPEM := pem.EncodeToMemory(&pem.Block{Type: "RSA PRIVATE KEY", Bytes: x509.MarshalPKCS1PrivateKey(rsaPrivKey)})
|
||
|
|
|
||
|
|
certPEM, err := PemCert(rsaPrivKey, domain, expiration)
|
||
|
|
if err != nil {
|
||
|
|
return nil, nil, err
|
||
|
|
}
|
||
|
|
return certPEM, keyPEM, nil
|
||
|
|
}
|
||
|
|
|
||
|
|
// PemCert generates PEM cert file
|
||
|
|
func PemCert(privKey *rsa.PrivateKey, domain string, expiration time.Time) ([]byte, error) {
|
||
|
|
derBytes, err := derCert(privKey, expiration, domain)
|
||
|
|
if err != nil {
|
||
|
|
return nil, err
|
||
|
|
}
|
||
|
|
|
||
|
|
return pem.EncodeToMemory(&pem.Block{Type: "CERTIFICATE", Bytes: derBytes}), nil
|
||
|
|
}
|
||
|
|
|
||
|
|
func derCert(privKey *rsa.PrivateKey, expiration time.Time, domain string) ([]byte, error) {
|
||
|
|
serialNumberLimit := new(big.Int).Lsh(big.NewInt(1), 128)
|
||
|
|
serialNumber, err := rand.Int(rand.Reader, serialNumberLimit)
|
||
|
|
if err != nil {
|
||
|
|
return nil, err
|
||
|
|
}
|
||
|
|
|
||
|
|
if expiration.IsZero() {
|
||
|
|
expiration = time.Now().Add(365 * (24 * time.Hour))
|
||
|
|
}
|
||
|
|
|
||
|
|
template := x509.Certificate{
|
||
|
|
SerialNumber: serialNumber,
|
||
|
|
Subject: pkix.Name{
|
||
|
|
CommonName: DefaultDomain,
|
||
|
|
},
|
||
|
|
NotBefore: time.Now(),
|
||
|
|
NotAfter: expiration,
|
||
|
|
|
||
|
|
KeyUsage: x509.KeyUsageKeyEncipherment,
|
||
|
|
BasicConstraintsValid: true,
|
||
|
|
DNSNames: []string{domain},
|
||
|
|
}
|
||
|
|
|
||
|
|
return x509.CreateCertificate(rand.Reader, &template, &template, &privKey.PublicKey, privKey)
|
||
|
|
}
|