mirror of
https://github.com/SagerNet/sing-box.git
synced 2024-11-23 09:01:30 +00:00
248 lines
7.1 KiB
Go
248 lines
7.1 KiB
Go
package naive
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import (
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"context"
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"io"
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"math/rand"
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"net"
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"net/http"
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"github.com/sagernet/sing-box/adapter"
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"github.com/sagernet/sing-box/adapter/inbound"
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"github.com/sagernet/sing-box/common/listener"
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"github.com/sagernet/sing-box/common/tls"
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"github.com/sagernet/sing-box/common/uot"
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C "github.com/sagernet/sing-box/constant"
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"github.com/sagernet/sing-box/log"
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"github.com/sagernet/sing-box/option"
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"github.com/sagernet/sing-box/transport/v2rayhttp"
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"github.com/sagernet/sing/common"
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"github.com/sagernet/sing/common/auth"
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E "github.com/sagernet/sing/common/exceptions"
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"github.com/sagernet/sing/common/logger"
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M "github.com/sagernet/sing/common/metadata"
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N "github.com/sagernet/sing/common/network"
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sHttp "github.com/sagernet/sing/protocol/http"
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)
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var ConfigureHTTP3ListenerFunc func(listener *listener.Listener, handler http.Handler, tlsConfig tls.ServerConfig, logger logger.Logger) (io.Closer, error)
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func RegisterInbound(registry *inbound.Registry) {
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inbound.Register[option.NaiveInboundOptions](registry, C.TypeNaive, NewInbound)
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}
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type Inbound struct {
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inbound.Adapter
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ctx context.Context
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router adapter.ConnectionRouterEx
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logger logger.ContextLogger
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listener *listener.Listener
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network []string
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networkIsDefault bool
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authenticator *auth.Authenticator
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tlsConfig tls.ServerConfig
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httpServer *http.Server
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h3Server io.Closer
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}
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func NewInbound(ctx context.Context, router adapter.Router, logger log.ContextLogger, tag string, options option.NaiveInboundOptions) (adapter.Inbound, error) {
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inbound := &Inbound{
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Adapter: inbound.NewAdapter(C.TypeNaive, tag),
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ctx: ctx,
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router: uot.NewRouter(router, logger),
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listener: listener.New(listener.Options{
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Context: ctx,
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Logger: logger,
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Listen: options.ListenOptions,
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}),
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networkIsDefault: options.Network == "",
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network: options.Network.Build(),
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authenticator: auth.NewAuthenticator(options.Users),
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}
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if common.Contains(inbound.network, N.NetworkUDP) {
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if options.TLS == nil || !options.TLS.Enabled {
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return nil, E.New("TLS is required for QUIC server")
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}
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}
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if len(options.Users) == 0 {
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return nil, E.New("missing users")
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}
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if options.TLS != nil {
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tlsConfig, err := tls.NewServer(ctx, logger, common.PtrValueOrDefault(options.TLS))
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if err != nil {
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return nil, err
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}
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inbound.tlsConfig = tlsConfig
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}
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return inbound, nil
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}
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func (n *Inbound) Start() error {
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var tlsConfig *tls.STDConfig
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if n.tlsConfig != nil {
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err := n.tlsConfig.Start()
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if err != nil {
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return E.Cause(err, "create TLS config")
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}
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tlsConfig, err = n.tlsConfig.Config()
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if err != nil {
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return err
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}
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}
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if common.Contains(n.network, N.NetworkTCP) {
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tcpListener, err := n.listener.ListenTCP()
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if err != nil {
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return err
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}
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n.httpServer = &http.Server{
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Handler: n,
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TLSConfig: tlsConfig,
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BaseContext: func(listener net.Listener) context.Context {
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return n.ctx
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},
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}
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go func() {
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var sErr error
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if tlsConfig != nil {
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sErr = n.httpServer.ServeTLS(tcpListener, "", "")
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} else {
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sErr = n.httpServer.Serve(tcpListener)
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}
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if sErr != nil && !E.IsClosedOrCanceled(sErr) {
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n.logger.Error("http server serve error: ", sErr)
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}
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}()
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}
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if common.Contains(n.network, N.NetworkUDP) {
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http3Server, err := ConfigureHTTP3ListenerFunc(n.listener, n, n.tlsConfig, n.logger)
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if err == nil {
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n.h3Server = http3Server
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} else if len(n.network) > 1 {
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n.logger.Warn(E.Cause(err, "naive http3 disabled"))
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} else {
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return err
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}
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}
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return nil
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}
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func (n *Inbound) Close() error {
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return common.Close(
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&n.listener,
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common.PtrOrNil(n.httpServer),
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n.h3Server,
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n.tlsConfig,
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)
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}
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func (n *Inbound) ServeHTTP(writer http.ResponseWriter, request *http.Request) {
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ctx := log.ContextWithNewID(request.Context())
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if request.Method != "CONNECT" {
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rejectHTTP(writer, http.StatusBadRequest)
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n.badRequest(ctx, request, E.New("not CONNECT request"))
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return
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} else if request.Header.Get("Padding") == "" {
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rejectHTTP(writer, http.StatusBadRequest)
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n.badRequest(ctx, request, E.New("missing naive padding"))
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return
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}
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userName, password, authOk := sHttp.ParseBasicAuth(request.Header.Get("Proxy-Authorization"))
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if authOk {
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authOk = n.authenticator.Verify(userName, password)
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}
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if !authOk {
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rejectHTTP(writer, http.StatusProxyAuthRequired)
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n.badRequest(ctx, request, E.New("authorization failed"))
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return
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}
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writer.Header().Set("Padding", generateNaivePaddingHeader())
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writer.WriteHeader(http.StatusOK)
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writer.(http.Flusher).Flush()
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hostPort := request.URL.Host
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if hostPort == "" {
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hostPort = request.Host
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}
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source := sHttp.SourceAddress(request)
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destination := M.ParseSocksaddr(hostPort)
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if hijacker, isHijacker := writer.(http.Hijacker); isHijacker {
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conn, _, err := hijacker.Hijack()
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if err != nil {
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n.badRequest(ctx, request, E.New("hijack failed"))
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return
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}
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n.newConnection(ctx, false, &naiveH1Conn{Conn: conn}, userName, source, destination)
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} else {
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n.newConnection(ctx, true, &naiveH2Conn{reader: request.Body, writer: writer, flusher: writer.(http.Flusher)}, userName, source, destination)
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}
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}
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func (n *Inbound) newConnection(ctx context.Context, waitForClose bool, conn net.Conn, userName string, source M.Socksaddr, destination M.Socksaddr) {
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if userName != "" {
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n.logger.InfoContext(ctx, "[", userName, "] inbound connection from ", source)
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n.logger.InfoContext(ctx, "[", userName, "] inbound connection to ", destination)
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} else {
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n.logger.InfoContext(ctx, "inbound connection from ", source)
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n.logger.InfoContext(ctx, "inbound connection to ", destination)
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}
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var metadata adapter.InboundContext
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metadata.Inbound = n.Tag()
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metadata.InboundType = n.Type()
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metadata.InboundDetour = n.listener.ListenOptions().Detour
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metadata.InboundOptions = n.listener.ListenOptions().InboundOptions
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metadata.Source = source
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metadata.Destination = destination
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metadata.OriginDestination = M.SocksaddrFromNet(conn.LocalAddr()).Unwrap()
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metadata.User = userName
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if !waitForClose {
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n.router.RouteConnectionEx(ctx, conn, metadata, nil)
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} else {
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done := make(chan struct{})
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wrapper := v2rayhttp.NewHTTP2Wrapper(conn)
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n.router.RouteConnectionEx(ctx, conn, metadata, N.OnceClose(func(it error) {
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close(done)
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}))
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<-done
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wrapper.CloseWrapper()
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}
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}
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func (n *Inbound) badRequest(ctx context.Context, request *http.Request, err error) {
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n.logger.ErrorContext(ctx, E.Cause(err, "process connection from ", request.RemoteAddr))
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}
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func rejectHTTP(writer http.ResponseWriter, statusCode int) {
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hijacker, ok := writer.(http.Hijacker)
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if !ok {
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writer.WriteHeader(statusCode)
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return
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}
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conn, _, err := hijacker.Hijack()
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if err != nil {
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writer.WriteHeader(statusCode)
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return
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}
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if tcpConn, isTCP := common.Cast[*net.TCPConn](conn); isTCP {
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tcpConn.SetLinger(0)
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}
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conn.Close()
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}
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func generateNaivePaddingHeader() string {
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paddingLen := rand.Intn(32) + 30
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padding := make([]byte, paddingLen)
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bits := rand.Uint64()
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for i := 0; i < 16; i++ {
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// Codes that won't be Huffman coded.
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padding[i] = "!#$()+<>?@[]^`{}"[bits&15]
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bits >>= 4
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}
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for i := 16; i < paddingLen; i++ {
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padding[i] = '~'
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}
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return string(padding)
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}
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