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package control
import (
"crypto/ecdsa"
"crypto/elliptic"
"crypto/rand"
"crypto/x509"
"crypto/x509/pkix"
"encoding/base64"
"encoding/hex"
"encoding/pem"
"fmt"
"math/big"
"strings"
"time"
)
const (
defaultHysteria2Port = 443
defaultHysteria2UpMbps = 100
defaultHysteria2DownMbps = 100
defaultHysteria2CertPath = "/etc/sing-box/cert.pem"
defaultHysteria2KeyPath = "/etc/sing-box/key.pem"
defaultHysteria2ALPN = "h3"
)
func ensureHysteria2Profile(protocol *ProtocolProfile) error {
if protocol == nil || protocol.Type != "hysteria2" {
return nil
}
if protocol.Hysteria2 == nil {
protocol.Hysteria2 = &Hysteria2Profile{}
}
if protocol.Port > 0 && protocol.Hysteria2.Port == 0 {
protocol.Hysteria2.Port = protocol.Port
}
if protocol.Hysteria2.Port == 0 {
protocol.Hysteria2.Port = defaultHysteria2Port
}
protocol.Port = protocol.Hysteria2.Port
if protocol.Auth == nil {
protocol.Auth = &AuthProfile{}
}
if protocol.Hysteria2.UserPassword == "" && strings.TrimSpace(protocol.Auth.Password) != "" {
protocol.Hysteria2.UserPassword = strings.TrimSpace(protocol.Auth.Password)
}
if protocol.Hysteria2.UserPassword == "" {
password, err := randomBase64(16)
if err != nil {
return err
}
protocol.Hysteria2.UserPassword = password
}
protocol.Auth.Password = protocol.Hysteria2.UserPassword
if protocol.Extra == nil {
protocol.Extra = map[string]any{}
}
if protocol.Hysteria2.ObfsPassword == "" {
if extra := stringFromExtra(protocol.Extra, "obfs_password"); extra != "" {
protocol.Hysteria2.ObfsPassword = extra
}
}
if protocol.Hysteria2.ObfsPassword == "" {
obfsPassword, err := randomHex(32)
if err != nil {
return err
}
protocol.Hysteria2.ObfsPassword = obfsPassword
}
protocol.Extra["obfs_password"] = protocol.Hysteria2.ObfsPassword
if protocol.Hysteria2.UpMbps == 0 {
protocol.Hysteria2.UpMbps = intFromExtra(protocol.Extra, "up_mbps", defaultHysteria2UpMbps)
}
if protocol.Hysteria2.DownMbps == 0 {
protocol.Hysteria2.DownMbps = intFromExtra(protocol.Extra, "down_mbps", defaultHysteria2DownMbps)
}
protocol.Extra["up_mbps"] = protocol.Hysteria2.UpMbps
protocol.Extra["down_mbps"] = protocol.Hysteria2.DownMbps
if protocol.Hysteria2.CertPath == "" {
protocol.Hysteria2.CertPath = firstNonEmptyString(stringFromExtra(protocol.Extra, "tls_cert_path"), defaultHysteria2CertPath)
}
if protocol.Hysteria2.KeyPath == "" {
protocol.Hysteria2.KeyPath = firstNonEmptyString(stringFromExtra(protocol.Extra, "tls_key_path"), defaultHysteria2KeyPath)
}
protocol.Extra["tls_cert_path"] = protocol.Hysteria2.CertPath
protocol.Extra["tls_key_path"] = protocol.Hysteria2.KeyPath
if protocol.TLS == nil {
protocol.TLS = &TLSProfile{}
}
protocol.TLS.Enabled = true
if strings.TrimSpace(protocol.TLS.ServerName) == "" {
protocol.TLS.ServerName = ""
}
return nil
}
func GenerateSelfSignedCert() (certPEM, keyPEM []byte, err error) {
commonName := "node-" + randomHostnameSuffix() + ".local"
return generateSelfSignedCertForHost(commonName)
}
func generateSelfSignedCertForHost(commonName string) (certPEM, keyPEM []byte, err error) {
privateKey, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
if err != nil {
return nil, nil, fmt.Errorf("generate ecdsa key: %w", err)
}
serialLimit := new(big.Int).Lsh(big.NewInt(1), 128)
serialNumber, err := rand.Int(rand.Reader, serialLimit)
if err != nil {
return nil, nil, fmt.Errorf("generate serial: %w", err)
}
template := &x509.Certificate{
SerialNumber: serialNumber,
Subject: pkix.Name{
CommonName: commonName,
},
NotBefore: time.Now().UTC().Add(-time.Hour),
NotAfter: time.Now().UTC().AddDate(10, 0, 0),
KeyUsage: x509.KeyUsageDigitalSignature | x509.KeyUsageKeyEncipherment,
ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth},
BasicConstraintsValid: true,
DNSNames: []string{commonName},
}
certDER, err := x509.CreateCertificate(rand.Reader, template, template, &privateKey.PublicKey, privateKey)
if err != nil {
return nil, nil, fmt.Errorf("create certificate: %w", err)
}
certPEM = pem.EncodeToMemory(&pem.Block{Type: "CERTIFICATE", Bytes: certDER})
keyDER, err := x509.MarshalECPrivateKey(privateKey)
if err != nil {
return nil, nil, fmt.Errorf("marshal private key: %w", err)
}
keyPEM = pem.EncodeToMemory(&pem.Block{Type: "EC PRIVATE KEY", Bytes: keyDER})
return certPEM, keyPEM, nil
}
func randomBase64(size int) (string, error) {
buf := make([]byte, size)
if _, err := rand.Read(buf); err != nil {
return "", err
}
return base64.RawStdEncoding.EncodeToString(buf), nil
}
func randomHostnameSuffix() string {
buf := make([]byte, 4)
if _, err := rand.Read(buf); err != nil {
return "local"
}
return hex.EncodeToString(buf)
}
func firstNonEmptyString(values ...string) string {
for _, value := range values {
if strings.TrimSpace(value) != "" {
return strings.TrimSpace(value)
}
}
return ""
}
func EnsureProtocolForUI(protocol *ProtocolProfile) error {
if err := ensureRealityProfile(protocol); err != nil {
return err
}
if err := ensureHysteria2Profile(protocol); err != nil {
return err
}
return nil
}
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