133 lines
3.7 KiB
Go
133 lines
3.7 KiB
Go
package acme
|
|
|
|
import (
|
|
"crypto"
|
|
"crypto/ecdsa"
|
|
"crypto/rand"
|
|
"crypto/rsa"
|
|
"crypto/sha256"
|
|
"crypto/tls"
|
|
"crypto/x509"
|
|
"crypto/x509/pkix"
|
|
"encoding/hex"
|
|
"encoding/pem"
|
|
"fmt"
|
|
"math/big"
|
|
"time"
|
|
)
|
|
|
|
func generateDefaultCertificate() (*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 := generateKeyPair(domain, time.Time{})
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
certificate, err := tls.X509KeyPair(certPEM, keyPEM)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
return &certificate, nil
|
|
}
|
|
|
|
func generateKeyPair(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 := generatePemCert(rsaPrivKey, domain, expiration)
|
|
if err != nil {
|
|
return nil, nil, err
|
|
}
|
|
return certPEM, keyPEM, nil
|
|
}
|
|
|
|
func generatePemCert(privKey *rsa.PrivateKey, domain string, expiration time.Time) ([]byte, error) {
|
|
derBytes, err := generateDerCert(privKey, expiration, domain)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
return pem.EncodeToMemory(&pem.Block{Type: "CERTIFICATE", Bytes: derBytes}), nil
|
|
}
|
|
|
|
func generateDerCert(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)
|
|
}
|
|
|
|
template := x509.Certificate{
|
|
SerialNumber: serialNumber,
|
|
Subject: pkix.Name{
|
|
CommonName: "TRAEFIK DEFAULT CERT",
|
|
},
|
|
NotBefore: time.Now(),
|
|
NotAfter: expiration,
|
|
|
|
KeyUsage: x509.KeyUsageKeyEncipherment,
|
|
BasicConstraintsValid: true,
|
|
DNSNames: []string{domain},
|
|
}
|
|
|
|
return x509.CreateCertificate(rand.Reader, &template, &template, &privKey.PublicKey, privKey)
|
|
}
|
|
|
|
// TLSSNI01ChallengeCert returns a certificate and target domain for the `tls-sni-01` challenge
|
|
func TLSSNI01ChallengeCert(keyAuth string) (ChallengeCert, string, error) {
|
|
// generate a new RSA key for the certificates
|
|
var tempPrivKey crypto.PrivateKey
|
|
tempPrivKey, err := rsa.GenerateKey(rand.Reader, 2048)
|
|
if err != nil {
|
|
return ChallengeCert{}, "", err
|
|
}
|
|
rsaPrivKey := tempPrivKey.(*rsa.PrivateKey)
|
|
rsaPrivPEM := pemEncode(rsaPrivKey)
|
|
|
|
zBytes := sha256.Sum256([]byte(keyAuth))
|
|
z := hex.EncodeToString(zBytes[:sha256.Size])
|
|
domain := fmt.Sprintf("%s.%s.acme.invalid", z[:32], z[32:])
|
|
tempCertPEM, err := generatePemCert(rsaPrivKey, domain, time.Time{})
|
|
if err != nil {
|
|
return ChallengeCert{}, "", err
|
|
}
|
|
|
|
certificate, err := tls.X509KeyPair(tempCertPEM, rsaPrivPEM)
|
|
if err != nil {
|
|
return ChallengeCert{}, "", err
|
|
}
|
|
|
|
return ChallengeCert{Certificate: tempCertPEM, PrivateKey: rsaPrivPEM, certificate: &certificate}, domain, nil
|
|
}
|
|
func pemEncode(data interface{}) []byte {
|
|
var pemBlock *pem.Block
|
|
switch key := data.(type) {
|
|
case *ecdsa.PrivateKey:
|
|
keyBytes, _ := x509.MarshalECPrivateKey(key)
|
|
pemBlock = &pem.Block{Type: "EC PRIVATE KEY", Bytes: keyBytes}
|
|
case *rsa.PrivateKey:
|
|
pemBlock = &pem.Block{Type: "RSA PRIVATE KEY", Bytes: x509.MarshalPKCS1PrivateKey(key)}
|
|
case *x509.CertificateRequest:
|
|
pemBlock = &pem.Block{Type: "CERTIFICATE REQUEST", Bytes: key.Raw}
|
|
case []byte:
|
|
pemBlock = &pem.Block{Type: "CERTIFICATE", Bytes: []byte(data.([]byte))}
|
|
}
|
|
|
|
return pem.EncodeToMemory(pemBlock)
|
|
}
|