590 lines
18 KiB
Go
590 lines
18 KiB
Go
package inbound
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//go:generate go run github.com/xtls/xray-core/common/errors/errorgen
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import (
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"bytes"
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"context"
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gotls "crypto/tls"
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"io"
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"reflect"
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"strconv"
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"strings"
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"time"
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"unsafe"
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"github.com/xtls/xray-core/common"
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"github.com/xtls/xray-core/common/buf"
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"github.com/xtls/xray-core/common/errors"
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"github.com/xtls/xray-core/common/log"
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"github.com/xtls/xray-core/common/net"
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"github.com/xtls/xray-core/common/protocol"
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"github.com/xtls/xray-core/common/retry"
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"github.com/xtls/xray-core/common/session"
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"github.com/xtls/xray-core/common/signal"
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"github.com/xtls/xray-core/common/task"
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"github.com/xtls/xray-core/core"
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"github.com/xtls/xray-core/features/dns"
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feature_inbound "github.com/xtls/xray-core/features/inbound"
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"github.com/xtls/xray-core/features/policy"
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"github.com/xtls/xray-core/features/routing"
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"github.com/xtls/xray-core/proxy"
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"github.com/xtls/xray-core/proxy/vless"
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"github.com/xtls/xray-core/proxy/vless/encoding"
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"github.com/xtls/xray-core/transport/internet/reality"
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"github.com/xtls/xray-core/transport/internet/stat"
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"github.com/xtls/xray-core/transport/internet/tls"
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)
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func init() {
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common.Must(common.RegisterConfig((*Config)(nil), func(ctx context.Context, config interface{}) (interface{}, error) {
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var dc dns.Client
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if err := core.RequireFeatures(ctx, func(d dns.Client) error {
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dc = d
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return nil
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}); err != nil {
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return nil, err
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}
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return New(ctx, config.(*Config), dc)
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}))
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}
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// Handler is an inbound connection handler that handles messages in VLess protocol.
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type Handler struct {
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inboundHandlerManager feature_inbound.Manager
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policyManager policy.Manager
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validator *vless.Validator
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dns dns.Client
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fallbacks map[string]map[string]map[string]*Fallback // or nil
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// regexps map[string]*regexp.Regexp // or nil
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}
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// New creates a new VLess inbound handler.
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func New(ctx context.Context, config *Config, dc dns.Client) (*Handler, error) {
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v := core.MustFromContext(ctx)
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handler := &Handler{
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inboundHandlerManager: v.GetFeature(feature_inbound.ManagerType()).(feature_inbound.Manager),
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policyManager: v.GetFeature(policy.ManagerType()).(policy.Manager),
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validator: new(vless.Validator),
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dns: dc,
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}
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for _, user := range config.Clients {
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u, err := user.ToMemoryUser()
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if err != nil {
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return nil, newError("failed to get VLESS user").Base(err).AtError()
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}
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if err := handler.AddUser(ctx, u); err != nil {
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return nil, newError("failed to initiate user").Base(err).AtError()
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}
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}
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if config.Fallbacks != nil {
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handler.fallbacks = make(map[string]map[string]map[string]*Fallback)
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// handler.regexps = make(map[string]*regexp.Regexp)
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for _, fb := range config.Fallbacks {
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if handler.fallbacks[fb.Name] == nil {
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handler.fallbacks[fb.Name] = make(map[string]map[string]*Fallback)
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}
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if handler.fallbacks[fb.Name][fb.Alpn] == nil {
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handler.fallbacks[fb.Name][fb.Alpn] = make(map[string]*Fallback)
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}
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handler.fallbacks[fb.Name][fb.Alpn][fb.Path] = fb
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/*
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if fb.Path != "" {
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if r, err := regexp.Compile(fb.Path); err != nil {
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return nil, newError("invalid path regexp").Base(err).AtError()
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} else {
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handler.regexps[fb.Path] = r
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}
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}
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*/
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}
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if handler.fallbacks[""] != nil {
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for name, apfb := range handler.fallbacks {
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if name != "" {
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for alpn := range handler.fallbacks[""] {
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if apfb[alpn] == nil {
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apfb[alpn] = make(map[string]*Fallback)
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}
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}
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}
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}
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}
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for _, apfb := range handler.fallbacks {
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if apfb[""] != nil {
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for alpn, pfb := range apfb {
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if alpn != "" { // && alpn != "h2" {
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for path, fb := range apfb[""] {
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if pfb[path] == nil {
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pfb[path] = fb
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}
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}
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}
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}
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}
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}
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if handler.fallbacks[""] != nil {
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for name, apfb := range handler.fallbacks {
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if name != "" {
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for alpn, pfb := range handler.fallbacks[""] {
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for path, fb := range pfb {
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if apfb[alpn][path] == nil {
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apfb[alpn][path] = fb
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}
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}
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}
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}
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}
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}
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}
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return handler, nil
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}
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func isMuxAndNotXUDP(request *protocol.RequestHeader, first *buf.Buffer) bool {
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if request.Command != protocol.RequestCommandMux {
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return false
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}
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if first.Len() < 7 {
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return true
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}
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firstBytes := first.Bytes()
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return !(firstBytes[2] == 0 && // ID high
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firstBytes[3] == 0 && // ID low
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firstBytes[6] == 2) // Network type: UDP
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}
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// Close implements common.Closable.Close().
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func (h *Handler) Close() error {
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return errors.Combine(common.Close(h.validator))
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}
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// AddUser implements proxy.UserManager.AddUser().
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func (h *Handler) AddUser(ctx context.Context, u *protocol.MemoryUser) error {
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return h.validator.Add(u)
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}
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// RemoveUser implements proxy.UserManager.RemoveUser().
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func (h *Handler) RemoveUser(ctx context.Context, e string) error {
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return h.validator.Del(e)
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}
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// Network implements proxy.Inbound.Network().
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func (*Handler) Network() []net.Network {
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return []net.Network{net.Network_TCP, net.Network_UNIX}
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}
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// Process implements proxy.Inbound.Process().
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func (h *Handler) Process(ctx context.Context, network net.Network, connection stat.Connection, dispatcher routing.Dispatcher) error {
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sid := session.ExportIDToError(ctx)
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iConn := connection
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if statConn, ok := iConn.(*stat.CounterConnection); ok {
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iConn = statConn.Connection
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}
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sessionPolicy := h.policyManager.ForLevel(0)
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if err := connection.SetReadDeadline(time.Now().Add(sessionPolicy.Timeouts.Handshake)); err != nil {
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return newError("unable to set read deadline").Base(err).AtWarning()
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}
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first := buf.FromBytes(make([]byte, buf.Size))
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first.Clear()
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firstLen, _ := first.ReadFrom(connection)
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newError("firstLen = ", firstLen).AtInfo().WriteToLog(sid)
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reader := &buf.BufferedReader{
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Reader: buf.NewReader(connection),
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Buffer: buf.MultiBuffer{first},
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}
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var request *protocol.RequestHeader
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var requestAddons *proxy.Addons
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var err error
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napfb := h.fallbacks
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isfb := napfb != nil
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if isfb && firstLen < 18 {
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err = newError("fallback directly")
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} else {
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request, requestAddons, isfb, err = encoding.DecodeRequestHeader(isfb, first, reader, h.validator)
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}
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if err != nil {
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if isfb {
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if err := connection.SetReadDeadline(time.Time{}); err != nil {
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newError("unable to set back read deadline").Base(err).AtWarning().WriteToLog(sid)
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}
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newError("fallback starts").Base(err).AtInfo().WriteToLog(sid)
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name := ""
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alpn := ""
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if tlsConn, ok := iConn.(*tls.Conn); ok {
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cs := tlsConn.ConnectionState()
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name = cs.ServerName
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alpn = cs.NegotiatedProtocol
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newError("realName = " + name).AtInfo().WriteToLog(sid)
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newError("realAlpn = " + alpn).AtInfo().WriteToLog(sid)
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} else if realityConn, ok := iConn.(*reality.Conn); ok {
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cs := realityConn.ConnectionState()
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name = cs.ServerName
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alpn = cs.NegotiatedProtocol
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newError("realName = " + name).AtInfo().WriteToLog(sid)
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newError("realAlpn = " + alpn).AtInfo().WriteToLog(sid)
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}
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name = strings.ToLower(name)
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alpn = strings.ToLower(alpn)
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if len(napfb) > 1 || napfb[""] == nil {
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if name != "" && napfb[name] == nil {
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match := ""
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for n := range napfb {
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if n != "" && strings.Contains(name, n) && len(n) > len(match) {
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match = n
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}
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}
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name = match
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}
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}
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if napfb[name] == nil {
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name = ""
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}
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apfb := napfb[name]
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if apfb == nil {
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return newError(`failed to find the default "name" config`).AtWarning()
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}
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if apfb[alpn] == nil {
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alpn = ""
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}
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pfb := apfb[alpn]
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if pfb == nil {
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return newError(`failed to find the default "alpn" config`).AtWarning()
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}
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path := ""
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if len(pfb) > 1 || pfb[""] == nil {
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/*
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if lines := bytes.Split(firstBytes, []byte{'\r', '\n'}); len(lines) > 1 {
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if s := bytes.Split(lines[0], []byte{' '}); len(s) == 3 {
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if len(s[0]) < 8 && len(s[1]) > 0 && len(s[2]) == 8 {
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newError("realPath = " + string(s[1])).AtInfo().WriteToLog(sid)
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for _, fb := range pfb {
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if fb.Path != "" && h.regexps[fb.Path].Match(s[1]) {
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path = fb.Path
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break
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}
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}
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}
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}
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}
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*/
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if firstLen >= 18 && first.Byte(4) != '*' { // not h2c
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firstBytes := first.Bytes()
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for i := 4; i <= 8; i++ { // 5 -> 9
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if firstBytes[i] == '/' && firstBytes[i-1] == ' ' {
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search := len(firstBytes)
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if search > 64 {
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search = 64 // up to about 60
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}
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for j := i + 1; j < search; j++ {
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k := firstBytes[j]
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if k == '\r' || k == '\n' { // avoid logging \r or \n
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break
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}
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if k == '?' || k == ' ' {
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path = string(firstBytes[i:j])
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newError("realPath = " + path).AtInfo().WriteToLog(sid)
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if pfb[path] == nil {
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path = ""
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}
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break
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}
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}
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break
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}
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}
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}
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}
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fb := pfb[path]
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if fb == nil {
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return newError(`failed to find the default "path" config`).AtWarning()
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}
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ctx, cancel := context.WithCancel(ctx)
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timer := signal.CancelAfterInactivity(ctx, cancel, sessionPolicy.Timeouts.ConnectionIdle)
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ctx = policy.ContextWithBufferPolicy(ctx, sessionPolicy.Buffer)
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var conn net.Conn
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if err := retry.ExponentialBackoff(5, 100).On(func() error {
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var dialer net.Dialer
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conn, err = dialer.DialContext(ctx, fb.Type, fb.Dest)
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if err != nil {
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return err
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}
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return nil
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}); err != nil {
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return newError("failed to dial to " + fb.Dest).Base(err).AtWarning()
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}
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defer conn.Close()
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serverReader := buf.NewReader(conn)
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serverWriter := buf.NewWriter(conn)
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postRequest := func() error {
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defer timer.SetTimeout(sessionPolicy.Timeouts.DownlinkOnly)
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if fb.Xver != 0 {
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ipType := 4
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remoteAddr, remotePort, err := net.SplitHostPort(connection.RemoteAddr().String())
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if err != nil {
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ipType = 0
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}
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localAddr, localPort, err := net.SplitHostPort(connection.LocalAddr().String())
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if err != nil {
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ipType = 0
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}
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if ipType == 4 {
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for i := 0; i < len(remoteAddr); i++ {
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if remoteAddr[i] == ':' {
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ipType = 6
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break
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}
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}
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}
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pro := buf.New()
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defer pro.Release()
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switch fb.Xver {
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case 1:
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if ipType == 0 {
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pro.Write([]byte("PROXY UNKNOWN\r\n"))
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break
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}
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if ipType == 4 {
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pro.Write([]byte("PROXY TCP4 " + remoteAddr + " " + localAddr + " " + remotePort + " " + localPort + "\r\n"))
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} else {
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pro.Write([]byte("PROXY TCP6 " + remoteAddr + " " + localAddr + " " + remotePort + " " + localPort + "\r\n"))
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}
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case 2:
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pro.Write([]byte("\x0D\x0A\x0D\x0A\x00\x0D\x0A\x51\x55\x49\x54\x0A")) // signature
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if ipType == 0 {
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pro.Write([]byte("\x20\x00\x00\x00")) // v2 + LOCAL + UNSPEC + UNSPEC + 0 bytes
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break
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}
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if ipType == 4 {
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pro.Write([]byte("\x21\x11\x00\x0C")) // v2 + PROXY + AF_INET + STREAM + 12 bytes
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pro.Write(net.ParseIP(remoteAddr).To4())
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pro.Write(net.ParseIP(localAddr).To4())
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} else {
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pro.Write([]byte("\x21\x21\x00\x24")) // v2 + PROXY + AF_INET6 + STREAM + 36 bytes
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pro.Write(net.ParseIP(remoteAddr).To16())
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pro.Write(net.ParseIP(localAddr).To16())
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}
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p1, _ := strconv.ParseUint(remotePort, 10, 16)
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p2, _ := strconv.ParseUint(localPort, 10, 16)
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pro.Write([]byte{byte(p1 >> 8), byte(p1), byte(p2 >> 8), byte(p2)})
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}
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if err := serverWriter.WriteMultiBuffer(buf.MultiBuffer{pro}); err != nil {
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return newError("failed to set PROXY protocol v", fb.Xver).Base(err).AtWarning()
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}
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}
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if err := buf.Copy(reader, serverWriter, buf.UpdateActivity(timer)); err != nil {
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return newError("failed to fallback request payload").Base(err).AtInfo()
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}
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return nil
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}
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writer := buf.NewWriter(connection)
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getResponse := func() error {
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defer timer.SetTimeout(sessionPolicy.Timeouts.UplinkOnly)
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if err := buf.Copy(serverReader, writer, buf.UpdateActivity(timer)); err != nil {
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return newError("failed to deliver response payload").Base(err).AtInfo()
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}
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return nil
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}
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if err := task.Run(ctx, task.OnSuccess(postRequest, task.Close(serverWriter)), task.OnSuccess(getResponse, task.Close(writer))); err != nil {
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common.Interrupt(serverReader)
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common.Interrupt(serverWriter)
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return newError("fallback ends").Base(err).AtInfo()
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}
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return nil
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}
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if errors.Cause(err) != io.EOF {
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log.Record(&log.AccessMessage{
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From: connection.RemoteAddr(),
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To: "",
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Status: log.AccessRejected,
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Reason: err,
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})
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err = newError("invalid request from ", connection.RemoteAddr()).Base(err).AtInfo()
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}
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return err
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}
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if err := connection.SetReadDeadline(time.Time{}); err != nil {
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newError("unable to set back read deadline").Base(err).AtWarning().WriteToLog(sid)
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}
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newError("received request for ", request.Destination()).AtInfo().WriteToLog(sid)
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inbound := session.InboundFromContext(ctx)
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if inbound == nil {
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panic("no inbound metadata")
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}
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inbound.Name = "vless"
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inbound.User = request.User
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account := request.User.Account.(*vless.MemoryAccount)
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responseAddons := &proxy.Addons{
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Flow: account.Flow,
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}
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encoding.PopulateSeed(account.Seed, responseAddons)
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if check := encoding.CheckSeed(requestAddons, responseAddons); check != nil {
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return newError("Seed configuration mis-match").Base(check).AtWarning()
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}
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var input *bytes.Reader
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var rawInput *bytes.Buffer
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switch requestAddons.Flow {
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case vless.XRV:
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if account.Flow == requestAddons.Flow {
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inbound.SetCanSpliceCopy(2)
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switch request.Command {
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case protocol.RequestCommandUDP:
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return newError(requestAddons.Flow + " doesn't support UDP").AtWarning()
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case protocol.RequestCommandMux:
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fallthrough // we will break Mux connections that contain TCP requests
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case protocol.RequestCommandTCP:
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var t reflect.Type
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var p uintptr
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if tlsConn, ok := iConn.(*tls.Conn); ok {
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if tlsConn.ConnectionState().Version != gotls.VersionTLS13 {
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return newError(`failed to use `+requestAddons.Flow+`, found outer tls version `, tlsConn.ConnectionState().Version).AtWarning()
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}
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t = reflect.TypeOf(tlsConn.Conn).Elem()
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p = uintptr(unsafe.Pointer(tlsConn.Conn))
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} else if realityConn, ok := iConn.(*reality.Conn); ok {
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t = reflect.TypeOf(realityConn.Conn).Elem()
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p = uintptr(unsafe.Pointer(realityConn.Conn))
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} else {
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return newError("XTLS only supports TLS and REALITY directly for now.").AtWarning()
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}
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i, _ := t.FieldByName("input")
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r, _ := t.FieldByName("rawInput")
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input = (*bytes.Reader)(unsafe.Pointer(p + i.Offset))
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rawInput = (*bytes.Buffer)(unsafe.Pointer(p + r.Offset))
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}
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} else {
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return newError(account.ID.String() + " is not able to use " + requestAddons.Flow).AtWarning()
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}
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case "":
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inbound.SetCanSpliceCopy(3)
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if account.Flow == vless.XRV && (request.Command == protocol.RequestCommandTCP || isMuxAndNotXUDP(request, first)) {
|
|
return newError(account.ID.String() + " is not able to use \"\". Note that the pure TLS proxy has certain TLS in TLS characters.").AtWarning()
|
|
}
|
|
default:
|
|
return newError("unknown request flow " + requestAddons.Flow).AtWarning()
|
|
}
|
|
|
|
if request.Command != protocol.RequestCommandMux {
|
|
ctx = log.ContextWithAccessMessage(ctx, &log.AccessMessage{
|
|
From: connection.RemoteAddr(),
|
|
To: request.Destination(),
|
|
Status: log.AccessAccepted,
|
|
Reason: "",
|
|
Email: request.User.Email,
|
|
})
|
|
} else if account.Flow == vless.XRV {
|
|
ctx = session.ContextWithAllowedNetwork(ctx, net.Network_UDP)
|
|
}
|
|
|
|
sessionPolicy = h.policyManager.ForLevel(request.User.Level)
|
|
ctx, cancel := context.WithCancel(ctx)
|
|
timer := signal.CancelAfterInactivity(ctx, cancel, sessionPolicy.Timeouts.ConnectionIdle)
|
|
ctx = policy.ContextWithBufferPolicy(ctx, sessionPolicy.Buffer)
|
|
|
|
link, err := dispatcher.Dispatch(ctx, request.Destination())
|
|
if err != nil {
|
|
return newError("failed to dispatch request to ", request.Destination()).Base(err).AtWarning()
|
|
}
|
|
|
|
serverReader := link.Reader // .(*pipe.Reader)
|
|
serverWriter := link.Writer // .(*pipe.Writer)
|
|
trafficState := proxy.NewTrafficState(account.ID.Bytes(), account.Flow)
|
|
postRequest := func() error {
|
|
defer timer.SetTimeout(sessionPolicy.Timeouts.DownlinkOnly)
|
|
|
|
// default: clientReader := reader
|
|
clientReader := encoding.DecodeBodyAddons(reader, request, responseAddons, trafficState, ctx)
|
|
|
|
var err error
|
|
|
|
if requestAddons.Flow == vless.XRV {
|
|
ctx1 := session.ContextWithInbound(ctx, nil) // TODO enable splice
|
|
err = encoding.XtlsRead(clientReader, serverWriter, timer, connection, input, rawInput, trafficState, ctx1)
|
|
} else {
|
|
// from clientReader.ReadMultiBuffer to serverWriter.WriteMultiBufer
|
|
err = buf.Copy(clientReader, serverWriter, buf.UpdateActivity(timer))
|
|
}
|
|
|
|
if err != nil {
|
|
return newError("failed to transfer request payload").Base(err).AtInfo()
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
getResponse := func() error {
|
|
defer timer.SetTimeout(sessionPolicy.Timeouts.UplinkOnly)
|
|
|
|
bufferWriter := buf.NewBufferedWriter(buf.NewWriter(connection))
|
|
if err := encoding.EncodeResponseHeader(bufferWriter, request, responseAddons); err != nil {
|
|
return newError("failed to encode response header").Base(err).AtWarning()
|
|
}
|
|
|
|
// default: clientWriter := bufferWriter
|
|
clientWriter := encoding.EncodeBodyAddons(bufferWriter, request, responseAddons, trafficState, ctx)
|
|
multiBuffer, err1 := serverReader.ReadMultiBuffer()
|
|
if err1 != nil {
|
|
return err1 // ...
|
|
}
|
|
if err := clientWriter.WriteMultiBuffer(multiBuffer); err != nil {
|
|
return err // ...
|
|
}
|
|
// Flush; bufferWriter.WriteMultiBufer now is bufferWriter.writer.WriteMultiBuffer
|
|
if err := bufferWriter.SetBuffered(false); err != nil {
|
|
return newError("failed to write A response payload").Base(err).AtWarning()
|
|
}
|
|
|
|
var err error
|
|
if requestAddons.Flow == vless.XRV {
|
|
err = encoding.XtlsWrite(serverReader, clientWriter, timer, connection, trafficState, ctx)
|
|
} else {
|
|
// from serverReader.ReadMultiBuffer to clientWriter.WriteMultiBufer
|
|
err = buf.Copy(serverReader, clientWriter, buf.UpdateActivity(timer))
|
|
}
|
|
if err != nil {
|
|
return newError("failed to transfer response payload").Base(err).AtInfo()
|
|
}
|
|
// Indicates the end of response payload.
|
|
switch responseAddons.Flow {
|
|
default:
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
if err := task.Run(ctx, task.OnSuccess(postRequest, task.Close(serverWriter)), getResponse); err != nil {
|
|
common.Interrupt(serverReader)
|
|
common.Interrupt(serverWriter)
|
|
return newError("connection ends").Base(err).AtInfo()
|
|
}
|
|
|
|
return nil
|
|
}
|