134 lines
3.7 KiB
Go
134 lines
3.7 KiB
Go
package acme
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import (
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"crypto"
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"crypto/ecdsa"
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"crypto/rand"
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"crypto/rsa"
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"crypto/sha256"
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"crypto/tls"
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"crypto/x509"
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"crypto/x509/pkix"
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"encoding/hex"
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"encoding/pem"
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"fmt"
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"math/big"
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"time"
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)
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func generateDefaultCertificate() (*tls.Certificate, error) {
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randomBytes := make([]byte, 100)
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_, err := rand.Read(randomBytes)
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if err != nil {
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return nil, err
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}
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zBytes := sha256.Sum256(randomBytes)
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z := hex.EncodeToString(zBytes[:sha256.Size])
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domain := fmt.Sprintf("%s.%s.traefik.default", z[:32], z[32:])
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certPEM, keyPEM, err := generateKeyPair(domain, time.Time{})
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if err != nil {
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return nil, err
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}
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certificate, err := tls.X509KeyPair(certPEM, keyPEM)
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if err != nil {
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return nil, err
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}
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return &certificate, nil
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}
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func generateKeyPair(domain string, expiration time.Time) ([]byte, []byte, error) {
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rsaPrivKey, err := rsa.GenerateKey(rand.Reader, 2048)
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if err != nil {
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return nil, nil, err
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}
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keyPEM := pem.EncodeToMemory(&pem.Block{Type: "RSA PRIVATE KEY", Bytes: x509.MarshalPKCS1PrivateKey(rsaPrivKey)})
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certPEM, err := generatePemCert(rsaPrivKey, domain, expiration)
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if err != nil {
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return nil, nil, err
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}
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return certPEM, keyPEM, nil
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}
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func generatePemCert(privKey *rsa.PrivateKey, domain string, expiration time.Time) ([]byte, error) {
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derBytes, err := generateDerCert(privKey, expiration, domain)
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if err != nil {
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return nil, err
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}
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return pem.EncodeToMemory(&pem.Block{Type: "CERTIFICATE", Bytes: derBytes}), nil
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}
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func generateDerCert(privKey *rsa.PrivateKey, expiration time.Time, domain string) ([]byte, error) {
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serialNumberLimit := new(big.Int).Lsh(big.NewInt(1), 128)
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serialNumber, err := rand.Int(rand.Reader, serialNumberLimit)
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if err != nil {
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return nil, err
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}
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if expiration.IsZero() {
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expiration = time.Now().Add(365)
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}
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template := x509.Certificate{
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SerialNumber: serialNumber,
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Subject: pkix.Name{
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CommonName: "TRAEFIK DEFAULT CERT",
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},
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NotBefore: time.Now(),
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NotAfter: expiration,
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KeyUsage: x509.KeyUsageKeyEncipherment,
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BasicConstraintsValid: true,
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DNSNames: []string{domain},
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}
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return x509.CreateCertificate(rand.Reader, &template, &template, &privKey.PublicKey, privKey)
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}
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// TLSSNI01ChallengeCert returns a certificate and target domain for the `tls-sni-01` challenge
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func TLSSNI01ChallengeCert(keyAuth string) (ChallengeCert, string, error) {
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// generate a new RSA key for the certificates
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var tempPrivKey crypto.PrivateKey
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tempPrivKey, err := rsa.GenerateKey(rand.Reader, 2048)
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if err != nil {
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return ChallengeCert{}, "", err
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}
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rsaPrivKey := tempPrivKey.(*rsa.PrivateKey)
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rsaPrivPEM := pemEncode(rsaPrivKey)
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zBytes := sha256.Sum256([]byte(keyAuth))
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z := hex.EncodeToString(zBytes[:sha256.Size])
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domain := fmt.Sprintf("%s.%s.acme.invalid", z[:32], z[32:])
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tempCertPEM, err := generatePemCert(rsaPrivKey, domain, time.Time{})
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if err != nil {
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return ChallengeCert{}, "", err
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}
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certificate, err := tls.X509KeyPair(tempCertPEM, rsaPrivPEM)
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if err != nil {
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return ChallengeCert{}, "", err
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}
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return ChallengeCert{Certificate: tempCertPEM, PrivateKey: rsaPrivPEM, certificate: &certificate}, domain, nil
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}
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func pemEncode(data interface{}) []byte {
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var pemBlock *pem.Block
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switch key := data.(type) {
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case *ecdsa.PrivateKey:
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keyBytes, _ := x509.MarshalECPrivateKey(key)
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pemBlock = &pem.Block{Type: "EC PRIVATE KEY", Bytes: keyBytes}
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case *rsa.PrivateKey:
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pemBlock = &pem.Block{Type: "RSA PRIVATE KEY", Bytes: x509.MarshalPKCS1PrivateKey(key)}
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case *x509.CertificateRequest:
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pemBlock = &pem.Block{Type: "CERTIFICATE REQUEST", Bytes: key.Raw}
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case []byte:
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pemBlock = &pem.Block{Type: "CERTIFICATE", Bytes: []byte(data.([]byte))}
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}
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return pem.EncodeToMemory(pemBlock)
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}
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