94 lines
2.3 KiB
Go
94 lines
2.3 KiB
Go
package generate
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import (
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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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// DefaultDomain Traefik domain for the default certificate
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const DefaultDomain = "TRAEFIK DEFAULT CERT"
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// DefaultCertificate generates random TLS certificates
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func DefaultCertificate() (*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 := KeyPair(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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// KeyPair generates cert and key files
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func KeyPair(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 := PemCert(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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// PemCert generates PEM cert file
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func PemCert(privKey *rsa.PrivateKey, domain string, expiration time.Time) ([]byte, error) {
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derBytes, err := derCert(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 derCert(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 * (24 * time.Hour))
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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: DefaultDomain,
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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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