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292 lines
8.4 KiB
292 lines
8.4 KiB
package reality
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import (
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"bytes"
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"context"
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"crypto/aes"
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"crypto/cipher"
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"crypto/ecdh"
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"crypto/ed25519"
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"crypto/hmac"
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"crypto/rand"
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"crypto/sha256"
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"crypto/sha512"
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gotls "crypto/tls"
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"crypto/x509"
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"encoding/binary"
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"fmt"
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"io"
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"math/big"
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"net/http"
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"reflect"
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"regexp"
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"strings"
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"sync"
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"time"
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"unsafe"
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utls "github.com/refraction-networking/utls"
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"github.com/xtls/reality"
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"github.com/xtls/xray-core/common/errors"
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"github.com/xtls/xray-core/common/net"
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"github.com/xtls/xray-core/core"
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"github.com/xtls/xray-core/transport/internet/tls"
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"golang.org/x/crypto/chacha20poly1305"
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"golang.org/x/crypto/hkdf"
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"golang.org/x/net/http2"
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)
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//go:linkname aesgcmPreferred github.com/refraction-networking/utls.aesgcmPreferred
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func aesgcmPreferred(ciphers []uint16) bool
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type Conn struct {
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*reality.Conn
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}
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func (c *Conn) HandshakeAddress() net.Address {
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if err := c.Handshake(); err != nil {
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return nil
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}
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state := c.ConnectionState()
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if state.ServerName == "" {
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return nil
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}
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return net.ParseAddress(state.ServerName)
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}
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func Server(c net.Conn, config *reality.Config) (net.Conn, error) {
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realityConn, err := reality.Server(context.Background(), c, config)
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return &Conn{Conn: realityConn}, err
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}
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type UConn struct {
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*utls.UConn
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ServerName string
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AuthKey []byte
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Verified bool
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}
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func (c *UConn) HandshakeAddress() net.Address {
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if err := c.Handshake(); err != nil {
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return nil
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}
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state := c.ConnectionState()
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if state.ServerName == "" {
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return nil
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}
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return net.ParseAddress(state.ServerName)
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}
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func (c *UConn) VerifyPeerCertificate(rawCerts [][]byte, verifiedChains [][]*x509.Certificate) error {
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p, _ := reflect.TypeOf(c.Conn).Elem().FieldByName("peerCertificates")
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certs := *(*([]*x509.Certificate))(unsafe.Pointer(uintptr(unsafe.Pointer(c.Conn)) + p.Offset))
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if pub, ok := certs[0].PublicKey.(ed25519.PublicKey); ok {
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h := hmac.New(sha512.New, c.AuthKey)
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h.Write(pub)
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if bytes.Equal(h.Sum(nil), certs[0].Signature) {
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c.Verified = true
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return nil
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}
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}
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opts := x509.VerifyOptions{
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DNSName: c.ServerName,
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Intermediates: x509.NewCertPool(),
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}
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for _, cert := range certs[1:] {
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opts.Intermediates.AddCert(cert)
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}
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if _, err := certs[0].Verify(opts); err != nil {
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return err
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}
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return nil
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}
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func UClient(c net.Conn, config *Config, ctx context.Context, dest net.Destination) (net.Conn, error) {
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localAddr := c.LocalAddr().String()
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uConn := &UConn{}
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utlsConfig := &utls.Config{
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VerifyPeerCertificate: uConn.VerifyPeerCertificate,
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ServerName: config.ServerName,
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InsecureSkipVerify: true,
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SessionTicketsDisabled: true,
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KeyLogWriter: KeyLogWriterFromConfig(config),
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}
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if utlsConfig.ServerName == "" {
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utlsConfig.ServerName = dest.Address.String()
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}
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uConn.ServerName = utlsConfig.ServerName
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fingerprint := tls.GetFingerprint(config.Fingerprint)
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if fingerprint == nil {
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return nil, errors.New("REALITY: failed to get fingerprint").AtError()
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}
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uConn.UConn = utls.UClient(c, utlsConfig, *fingerprint)
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{
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uConn.BuildHandshakeState()
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hello := uConn.HandshakeState.Hello
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hello.SessionId = make([]byte, 32)
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copy(hello.Raw[39:], hello.SessionId) // the fixed location of `Session ID`
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hello.SessionId[0] = core.Version_x
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hello.SessionId[1] = core.Version_y
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hello.SessionId[2] = core.Version_z
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hello.SessionId[3] = 0 // reserved
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binary.BigEndian.PutUint32(hello.SessionId[4:], uint32(time.Now().Unix()))
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copy(hello.SessionId[8:], config.ShortId)
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if config.Show {
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errors.LogInfo(ctx, fmt.Sprintf("REALITY localAddr: %v\thello.SessionId[:16]: %v\n", localAddr, hello.SessionId[:16]))
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}
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publicKey, err := ecdh.X25519().NewPublicKey(config.PublicKey)
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if err != nil {
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return nil, errors.New("REALITY: publicKey == nil")
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}
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if uConn.HandshakeState.State13.EcdheKey == nil {
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return nil, errors.New("Current fingerprint ", uConn.ClientHelloID.Client, uConn.ClientHelloID.Version, " does not support TLS 1.3, REALITY handshake cannot establish.")
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}
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uConn.AuthKey, _ = uConn.HandshakeState.State13.EcdheKey.ECDH(publicKey)
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if uConn.AuthKey == nil {
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return nil, errors.New("REALITY: SharedKey == nil")
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}
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if _, err := hkdf.New(sha256.New, uConn.AuthKey, hello.Random[:20], []byte("REALITY")).Read(uConn.AuthKey); err != nil {
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return nil, err
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}
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var aead cipher.AEAD
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if aesgcmPreferred(hello.CipherSuites) {
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block, _ := aes.NewCipher(uConn.AuthKey)
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aead, _ = cipher.NewGCM(block)
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} else {
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aead, _ = chacha20poly1305.New(uConn.AuthKey)
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}
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if config.Show {
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errors.LogInfo(ctx, fmt.Sprintf("REALITY localAddr: %v\tuConn.AuthKey[:16]: %v\tAEAD: %T\n", localAddr, uConn.AuthKey[:16], aead))
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}
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aead.Seal(hello.SessionId[:0], hello.Random[20:], hello.SessionId[:16], hello.Raw)
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copy(hello.Raw[39:], hello.SessionId)
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}
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if err := uConn.HandshakeContext(ctx); err != nil {
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return nil, err
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}
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if config.Show {
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errors.LogInfo(ctx, fmt.Sprintf("REALITY localAddr: %v\tuConn.Verified: %v\n", localAddr, uConn.Verified))
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}
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if !uConn.Verified {
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go func() {
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client := &http.Client{
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Transport: &http2.Transport{
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DialTLSContext: func(ctx context.Context, network, addr string, cfg *gotls.Config) (net.Conn, error) {
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errors.LogInfo(ctx, fmt.Sprintf("REALITY localAddr: %v\tDialTLSContext\n", localAddr))
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return uConn, nil
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},
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},
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}
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prefix := []byte("https://" + uConn.ServerName)
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maps.Lock()
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if maps.maps == nil {
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maps.maps = make(map[string]map[string]bool)
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}
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paths := maps.maps[uConn.ServerName]
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if paths == nil {
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paths = make(map[string]bool)
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paths[config.SpiderX] = true
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maps.maps[uConn.ServerName] = paths
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}
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firstURL := string(prefix) + getPathLocked(paths)
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maps.Unlock()
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get := func(first bool) {
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var (
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req *http.Request
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resp *http.Response
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err error
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body []byte
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)
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if first {
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req, _ = http.NewRequest("GET", firstURL, nil)
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} else {
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maps.Lock()
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req, _ = http.NewRequest("GET", string(prefix)+getPathLocked(paths), nil)
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maps.Unlock()
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}
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if req == nil {
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return
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}
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req.Header.Set("User-Agent", fingerprint.Client) // TODO: User-Agent map
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if first && config.Show {
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errors.LogInfo(ctx, fmt.Sprintf("REALITY localAddr: %v\treq.UserAgent(): %v\n", localAddr, req.UserAgent()))
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}
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times := 1
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if !first {
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times = int(randBetween(config.SpiderY[4], config.SpiderY[5]))
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}
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for j := 0; j < times; j++ {
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if !first && j == 0 {
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req.Header.Set("Referer", firstURL)
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}
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req.AddCookie(&http.Cookie{Name: "padding", Value: strings.Repeat("0", int(randBetween(config.SpiderY[0], config.SpiderY[1])))})
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if resp, err = client.Do(req); err != nil {
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break
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}
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defer resp.Body.Close()
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req.Header.Set("Referer", req.URL.String())
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if body, err = io.ReadAll(resp.Body); err != nil {
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break
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}
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maps.Lock()
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for _, m := range href.FindAllSubmatch(body, -1) {
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m[1] = bytes.TrimPrefix(m[1], prefix)
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if !bytes.Contains(m[1], dot) {
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paths[string(m[1])] = true
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}
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}
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req.URL.Path = getPathLocked(paths)
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if config.Show {
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errors.LogInfo(ctx, fmt.Sprintf("REALITY localAddr: %v\treq.Referer(): %v\n", localAddr, req.Referer()))
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errors.LogInfo(ctx, fmt.Sprintf("REALITY localAddr: %v\tlen(body): %v\n", localAddr, len(body)))
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errors.LogInfo(ctx, fmt.Sprintf("REALITY localAddr: %v\tlen(paths): %v\n", localAddr, len(paths)))
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}
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maps.Unlock()
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if !first {
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time.Sleep(time.Duration(randBetween(config.SpiderY[6], config.SpiderY[7])) * time.Millisecond) // interval
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}
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}
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}
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get(true)
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concurrency := int(randBetween(config.SpiderY[2], config.SpiderY[3]))
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for i := 0; i < concurrency; i++ {
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go get(false)
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}
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// Do not close the connection
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}()
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time.Sleep(time.Duration(randBetween(config.SpiderY[8], config.SpiderY[9])) * time.Millisecond) // return
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return nil, errors.New("REALITY: processed invalid connection").AtWarning()
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}
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return uConn, nil
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}
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var (
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href = regexp.MustCompile(`href="([/h].*?)"`)
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dot = []byte(".")
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)
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var maps struct {
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sync.Mutex
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maps map[string]map[string]bool
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}
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func getPathLocked(paths map[string]bool) string {
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stopAt := int(randBetween(0, int64(len(paths)-1)))
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i := 0
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for s := range paths {
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if i == stopAt {
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return s
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}
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i++
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}
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return "/"
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}
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func randBetween(left int64, right int64) int64 {
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if left == right {
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return left
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}
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bigInt, _ := rand.Int(rand.Reader, big.NewInt(right-left))
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return left + bigInt.Int64()
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}
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