126 lines
2.8 KiB
Go
126 lines
2.8 KiB
Go
package parsing
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import (
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"crypto/rand"
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"crypto/rsa"
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"crypto/tls"
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"crypto/x509"
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"crypto/x509/pkix"
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"encoding/pem"
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"math/big"
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"time"
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"github.com/go-gost/core/logger"
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"github.com/go-gost/x/config"
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)
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var (
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defaultTLSConfig *tls.Config
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)
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func BuildDefaultTLSConfig(cfg *config.TLSConfig) {
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log := logger.Default()
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if cfg == nil {
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cfg = &config.TLSConfig{
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CertFile: "cert.pem",
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KeyFile: "key.pem",
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}
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}
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tlsConfig, err := loadConfig(cfg.CertFile, cfg.KeyFile)
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if err != nil {
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// generate random self-signed certificate.
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cert, err := genCertificate(cfg.Validity, cfg.Organization, cfg.CommonName)
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if err != nil {
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log.Fatal(err)
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}
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tlsConfig = &tls.Config{
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Certificates: []tls.Certificate{cert},
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}
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log.Debug("load global TLS certificate files failed, use random generated certificate")
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} else {
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log.Debug("load global TLS certificate files OK")
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}
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defaultTLSConfig = tlsConfig
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}
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func loadConfig(certFile, keyFile string) (*tls.Config, error) {
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cert, err := tls.LoadX509KeyPair(certFile, keyFile)
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if err != nil {
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return nil, err
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}
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cfg := &tls.Config{
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Certificates: []tls.Certificate{cert},
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}
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return cfg, nil
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}
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func genCertificate(validity time.Duration, org string, cn string) (cert tls.Certificate, err error) {
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rawCert, rawKey, err := generateKeyPair(validity, org, cn)
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if err != nil {
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return
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}
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return tls.X509KeyPair(rawCert, rawKey)
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}
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func generateKeyPair(validity time.Duration, org string, cn string) (rawCert, rawKey []byte, err error) {
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// Create private key and self-signed certificate
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// Adapted from https://golang.org/src/crypto/tls/generate_cert.go
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priv, err := rsa.GenerateKey(rand.Reader, 2048)
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if err != nil {
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return
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}
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if validity <= 0 {
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validity = time.Hour * 24 * 365 // one year
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}
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if org == "" {
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org = "GOST"
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}
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if cn == "" {
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cn = "gost.run"
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}
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validFor := validity
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notBefore := time.Now()
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notAfter := notBefore.Add(validFor)
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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
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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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Organization: []string{org},
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CommonName: cn,
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},
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NotBefore: notBefore,
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NotAfter: notAfter,
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KeyUsage: x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature,
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ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth},
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BasicConstraintsValid: true,
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}
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template.DNSNames = append(template.DNSNames, cn)
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derBytes, err := x509.CreateCertificate(rand.Reader, &template, &template, &priv.PublicKey, priv)
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if err != nil {
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return
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}
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rawCert = pem.EncodeToMemory(&pem.Block{Type: "CERTIFICATE", Bytes: derBytes})
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privBytes, err := x509.MarshalPKCS8PrivateKey(priv)
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if err != nil {
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return
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}
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rawKey = pem.EncodeToMemory(&pem.Block{Type: "PRIVATE KEY", Bytes: privBytes})
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return
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}
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