package reality import ( "bytes" "context" "crypto/aes" "crypto/cipher" "crypto/ecdh" "crypto/ed25519" "crypto/hmac" "crypto/rand" "crypto/sha256" "crypto/sha512" gotls "crypto/tls" "crypto/x509" "encoding/binary" "fmt" "io" "math/big" "net/http" "reflect" "regexp" "strings" "sync" "time" "unsafe" utls "github.com/refraction-networking/utls" "github.com/xtls/reality" "github.com/xtls/xray-core/common/errors" "github.com/xtls/xray-core/common/net" "github.com/xtls/xray-core/core" "github.com/xtls/xray-core/transport/internet/tls" "golang.org/x/crypto/chacha20poly1305" "golang.org/x/crypto/hkdf" "golang.org/x/net/http2" ) //go:generate go run github.com/xtls/xray-core/common/errors/errorgen //go:linkname aesgcmPreferred github.com/refraction-networking/utls.aesgcmPreferred func aesgcmPreferred(ciphers []uint16) bool type Conn struct { *reality.Conn } func (c *Conn) HandshakeAddress() net.Address { if err := c.Handshake(); err != nil { return nil } state := c.ConnectionState() if state.ServerName == "" { return nil } return net.ParseAddress(state.ServerName) } func Server(c net.Conn, config *reality.Config) (net.Conn, error) { realityConn, err := reality.Server(context.Background(), c, config) return &Conn{Conn: realityConn}, err } type UConn struct { *utls.UConn ServerName string AuthKey []byte Verified bool } func (c *UConn) HandshakeAddress() net.Address { if err := c.Handshake(); err != nil { return nil } state := c.ConnectionState() if state.ServerName == "" { return nil } return net.ParseAddress(state.ServerName) } func (c *UConn) VerifyPeerCertificate(rawCerts [][]byte, verifiedChains [][]*x509.Certificate) error { p, _ := reflect.TypeOf(c.Conn).Elem().FieldByName("peerCertificates") certs := *(*([]*x509.Certificate))(unsafe.Pointer(uintptr(unsafe.Pointer(c.Conn)) + p.Offset)) if pub, ok := certs[0].PublicKey.(ed25519.PublicKey); ok { h := hmac.New(sha512.New, c.AuthKey) h.Write(pub) if bytes.Equal(h.Sum(nil), certs[0].Signature) { c.Verified = true return nil } } opts := x509.VerifyOptions{ DNSName: c.ServerName, Intermediates: x509.NewCertPool(), } for _, cert := range certs[1:] { opts.Intermediates.AddCert(cert) } if _, err := certs[0].Verify(opts); err != nil { return err } return nil } func UClient(c net.Conn, config *Config, ctx context.Context, dest net.Destination) (net.Conn, error) { localAddr := c.LocalAddr().String() uConn := &UConn{} utlsConfig := &utls.Config{ VerifyPeerCertificate: uConn.VerifyPeerCertificate, ServerName: config.ServerName, InsecureSkipVerify: true, SessionTicketsDisabled: true, } if utlsConfig.ServerName == "" { utlsConfig.ServerName = dest.Address.String() } uConn.ServerName = utlsConfig.ServerName fingerprint := tls.GetFingerprint(config.Fingerprint) if fingerprint == nil { return nil, newError("REALITY: failed to get fingerprint").AtError() } uConn.UConn = utls.UClient(c, utlsConfig, *fingerprint) { uConn.BuildHandshakeState() hello := uConn.HandshakeState.Hello hello.SessionId = make([]byte, 32) copy(hello.Raw[39:], hello.SessionId) // the fixed location of `Session ID` hello.SessionId[0] = core.Version_x hello.SessionId[1] = core.Version_y hello.SessionId[2] = core.Version_z hello.SessionId[3] = 0 // reserved binary.BigEndian.PutUint32(hello.SessionId[4:], uint32(time.Now().Unix())) copy(hello.SessionId[8:], config.ShortId) if config.Show { fmt.Printf("REALITY localAddr: %v\thello.SessionId[:16]: %v\n", localAddr, hello.SessionId[:16]) } publicKey, _ := ecdh.X25519().NewPublicKey(config.PublicKey) uConn.AuthKey, _ = uConn.HandshakeState.State13.EcdheKey.ECDH(publicKey) if uConn.AuthKey == nil { return nil, errors.New("REALITY: SharedKey == nil") } if _, err := hkdf.New(sha256.New, uConn.AuthKey, hello.Random[:20], []byte("REALITY")).Read(uConn.AuthKey); err != nil { return nil, err } var aead cipher.AEAD if aesgcmPreferred(hello.CipherSuites) { block, _ := aes.NewCipher(uConn.AuthKey) aead, _ = cipher.NewGCM(block) } else { aead, _ = chacha20poly1305.New(uConn.AuthKey) } if config.Show { fmt.Printf("REALITY localAddr: %v\tuConn.AuthKey[:16]: %v\tAEAD: %T\n", localAddr, uConn.AuthKey[:16], aead) } aead.Seal(hello.SessionId[:0], hello.Random[20:], hello.SessionId[:16], hello.Raw) copy(hello.Raw[39:], hello.SessionId) } if err := uConn.Handshake(); err != nil { return nil, err } if config.Show { fmt.Printf("REALITY localAddr: %v\tuConn.Verified: %v\n", localAddr, uConn.Verified) } if !uConn.Verified { go func() { client := &http.Client{ Transport: &http2.Transport{ DialTLSContext: func(ctx context.Context, network, addr string, cfg *gotls.Config) (net.Conn, error) { fmt.Printf("REALITY localAddr: %v\tDialTLSContext\n", localAddr) return uConn, nil }, }, } prefix := []byte("https://" + uConn.ServerName) maps.Lock() if maps.maps == nil { maps.maps = make(map[string]map[string]bool) } paths := maps.maps[uConn.ServerName] if paths == nil { paths = make(map[string]bool) paths[config.SpiderX] = true maps.maps[uConn.ServerName] = paths } firstURL := string(prefix) + getPathLocked(paths) maps.Unlock() get := func(first bool) { var ( req *http.Request resp *http.Response err error body []byte ) if first { req, _ = http.NewRequest("GET", firstURL, nil) } else { maps.Lock() req, _ = http.NewRequest("GET", string(prefix)+getPathLocked(paths), nil) maps.Unlock() } req.Header.Set("User-Agent", fingerprint.Client) // TODO: User-Agent map if first && config.Show { fmt.Printf("REALITY localAddr: %v\treq.UserAgent(): %v\n", localAddr, req.UserAgent()) } times := 1 if !first { times = int(randBetween(config.SpiderY[4], config.SpiderY[5])) } for j := 0; j < times; j++ { if !first && j == 0 { req.Header.Set("Referer", firstURL) } req.AddCookie(&http.Cookie{Name: "padding", Value: strings.Repeat("0", int(randBetween(config.SpiderY[0], config.SpiderY[1])))}) if resp, err = client.Do(req); err != nil { break } req.Header.Set("Referer", req.URL.String()) if body, err = io.ReadAll(resp.Body); err != nil { break } maps.Lock() for _, m := range href.FindAllSubmatch(body, -1) { m[1] = bytes.TrimPrefix(m[1], prefix) if !bytes.Contains(m[1], dot) { paths[string(m[1])] = true } } req.URL.Path = getPathLocked(paths) if config.Show { fmt.Printf("REALITY localAddr: %v\treq.Referer(): %v\n", localAddr, req.Referer()) fmt.Printf("REALITY localAddr: %v\tlen(body): %v\n", localAddr, len(body)) fmt.Printf("REALITY localAddr: %v\tlen(paths): %v\n", localAddr, len(paths)) } maps.Unlock() if !first { time.Sleep(time.Duration(randBetween(config.SpiderY[6], config.SpiderY[7])) * time.Millisecond) // interval } } } get(true) concurrency := int(randBetween(config.SpiderY[2], config.SpiderY[3])) for i := 0; i < concurrency; i++ { go get(false) } // Do not close the connection }() time.Sleep(time.Duration(randBetween(config.SpiderY[8], config.SpiderY[9])) * time.Millisecond) // return return nil, errors.New("REALITY: processed invalid connection") } return uConn, nil } var ( href = regexp.MustCompile(`href="([/h].*?)"`) dot = []byte(".") ) var maps struct { sync.Mutex maps map[string]map[string]bool } func getPathLocked(paths map[string]bool) string { stopAt := int(randBetween(0, int64(len(paths)-1))) i := 0 for s := range paths { if i == stopAt { return s } i++ } return "/" } func randBetween(left int64, right int64) int64 { if left == right { return left } bigInt, _ := rand.Int(rand.Reader, big.NewInt(right-left)) return left + bigInt.Int64() }