-
-
package selfcert
-
-import (
- "crypto/ecdsa"
- "crypto/elliptic"
- "crypto/rand"
- "crypto/tls"
- "crypto/x509"
- "crypto/x509/pkix"
- "encoding/pem"
- "math/big"
- "net"
- "time"
-)
-
-func NewTLSConfig(hosts []string) (*tls.Config, error) {
- priv, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
- 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
- }
-
- template := x509.Certificate{
- SerialNumber: serialNumber,
- Subject: pkix.Name{
- Organization: []string{"Acme Co"},
- },
- NotBefore: time.Now(),
- NotAfter: time.Now().Add(10 * 365 * 24 * time.Hour),
- KeyUsage: x509.KeyUsageDigitalSignature,
- ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth},
- BasicConstraintsValid: true,
- }
-
- for _, h := range hosts {
- if ip := net.ParseIP(h); ip != nil {
- template.IPAddresses = append(template.IPAddresses, ip)
- } else {
- template.DNSNames = append(template.DNSNames, h)
- }
- }
-
- certBytes, err := x509.CreateCertificate(rand.Reader, &template, &template, &priv.PublicKey, priv)
- if err != nil {
- return nil, err
- }
-
- certPem := pem.EncodeToMemory(&pem.Block{Type: "CERTIFICATE", Bytes: certBytes})
-
- keyBytes, err := x509.MarshalPKCS8PrivateKey(priv)
- if err != nil {
- return nil, err
- }
-
- keyPem := pem.EncodeToMemory(&pem.Block{Type: "PRIVATE KEY", Bytes: keyBytes})
-
- cert, err := tls.X509KeyPair(certPem, keyPem)
- if err != nil {
- return nil, err
- }
-
- conf := &tls.Config{
- Certificates: []tls.Certificate{cert},
- MinVersion: tls.VersionTLS13,
- NextProtos: []string{"h2"},
- }
-
- return conf, nil
-}
-
-func NewTLSConfigFromHostPort(hostport string) (*tls.Config, error) {
- host, _, err := net.SplitHostPort(hostport)
- if err != nil {
- return nil, err
- }
-
- return NewTLSConfig([]string{host})
-}
-
-
-