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Add trojan fallback for ALPN #31
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@ -23,9 +23,15 @@
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],
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"tls": {},
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"fallback": {
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"server": "127.0.0.0.1",
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"server": "127.0.0.1",
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"server_port": 8080
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},
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"fallback_for_alpn": {
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"http/1.1": {
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"server": "127.0.0.1",
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"server_port": 8081
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}
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},
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"transport": {}
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}
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]
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@ -50,7 +56,13 @@ TLS configuration, see [TLS](/configuration/shared/tls/#inbound).
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There is no evidence that GFW detects and blocks Trojan servers based on HTTP responses, and opening the standard http/s port on the server is a much bigger signature.
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Fallback server configuration. Disabled if empty.
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Fallback server configuration. Disabled if `fallback` and `fallback_for_alpn` are empty.
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#### fallback_for_alpn
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Fallback server configuration for specified ALPN.
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If not empty, TLS fallback requests with ALPN not in this table will be rejected.
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#### transport
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@ -6,7 +6,6 @@
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{
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"type": "trojan",
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"tag": "trojan-in",
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"listen": "::",
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"listen_port": 2080,
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"tcp_fast_open": false,
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@ -14,7 +13,6 @@
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"sniff_override_destination": false,
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"domain_strategy": "prefer_ipv6",
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"proxy_protocol": false,
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"users": [
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{
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"name": "sekai",
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@ -23,9 +21,15 @@
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],
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"tls": {},
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"fallback": {
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"server": "127.0.0.0.1",
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"server": "127.0.0.1",
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"server_port": 8080
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},
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"fallback_for_alpn": {
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"http/1.1": {
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"server": "127.0.0.1",
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"server_port": 8081
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}
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},
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"transport": {}
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}
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]
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@ -52,7 +56,13 @@ TLS 配置, 参阅 [TLS](/zh/configuration/shared/tls/#inbound)。
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没有证据表明 GFW 基于 HTTP 响应检测并阻止木马服务器,并且在服务器上打开标准 http/s 端口是一个更大的特征。
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备用服务器配置。默认禁用。
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回退服务器配置。如果 `fallback` 和 `fallback_for_alpn` 为空,则禁用回退。
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#### fallback_for_alpn
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为 ALPN 指定回退服务器配置。
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如果不为空,ALPN 不在此列表中的 TLS 回退请求将被拒绝。
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#### transport
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@ -24,11 +24,12 @@ var _ adapter.Inbound = (*Trojan)(nil)
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type Trojan struct {
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myInboundAdapter
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service *trojan.Service[int]
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users []option.TrojanUser
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tlsConfig *TLSConfig
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fallbackAddr M.Socksaddr
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transport adapter.V2RayServerTransport
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service *trojan.Service[int]
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users []option.TrojanUser
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tlsConfig *TLSConfig
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fallbackAddr M.Socksaddr
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fallbackAddrTLSNextProto map[string]M.Socksaddr
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transport adapter.V2RayServerTransport
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}
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func NewTrojan(ctx context.Context, router adapter.Router, logger log.ContextLogger, tag string, options option.TrojanInboundOptions) (*Trojan, error) {
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@ -44,9 +45,35 @@ func NewTrojan(ctx context.Context, router adapter.Router, logger log.ContextLog
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},
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users: options.Users,
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}
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if options.TLS != nil {
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tlsConfig, err := NewTLSConfig(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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var fallbackHandler N.TCPConnectionHandler
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if options.Fallback != nil && options.Fallback.Server != "" {
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inbound.fallbackAddr = options.Fallback.Build()
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if options.Fallback != nil && options.Fallback.Server != "" || len(options.FallbackForALPN) > 0 {
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if options.Fallback != nil && options.Fallback.Server != "" {
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inbound.fallbackAddr = options.Fallback.Build()
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if !inbound.fallbackAddr.IsValid() {
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return nil, E.New("invalid fallback address: ", inbound.fallbackAddr)
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}
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}
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if len(options.FallbackForALPN) > 0 {
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if inbound.tlsConfig == nil {
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return nil, E.New("fallback for ALPN is not supported without TLS")
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}
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fallbackAddrNextProto := make(map[string]M.Socksaddr)
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for nextProto, destination := range options.FallbackForALPN {
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fallbackAddr := destination.Build()
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if !fallbackAddr.IsValid() {
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return nil, E.New("invalid fallback address for ALPN ", nextProto, ": ", fallbackAddr)
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}
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fallbackAddrNextProto[nextProto] = fallbackAddr
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}
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inbound.fallbackAddrTLSNextProto = fallbackAddrNextProto
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}
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fallbackHandler = adapter.NewUpstreamContextHandler(inbound.fallbackConnection, nil, nil)
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}
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service := trojan.NewService[int](adapter.NewUpstreamContextHandler(inbound.newConnection, inbound.newPacketConnection, inbound), fallbackHandler)
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@ -58,13 +85,6 @@ func NewTrojan(ctx context.Context, router adapter.Router, logger log.ContextLog
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if err != nil {
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return nil, err
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}
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if options.TLS != nil {
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tlsConfig, err := NewTLSConfig(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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if options.Transport != nil {
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var tlsConfig *tls.Config
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if inbound.tlsConfig != nil {
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@ -153,8 +173,22 @@ func (h *Trojan) newConnection(ctx context.Context, conn net.Conn, metadata adap
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}
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func (h *Trojan) fallbackConnection(ctx context.Context, conn net.Conn, metadata adapter.InboundContext) error {
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h.logger.InfoContext(ctx, "fallback connection to ", h.fallbackAddr)
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metadata.Destination = h.fallbackAddr
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var fallbackAddr M.Socksaddr
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if len(h.fallbackAddrTLSNextProto) > 0 {
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if tlsConn, loaded := common.Cast[*tls.Conn](conn); loaded {
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connectionState := tlsConn.ConnectionState()
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if connectionState.NegotiatedProtocol != "" {
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if fallbackAddr, loaded = h.fallbackAddrTLSNextProto[connectionState.NegotiatedProtocol]; !loaded {
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return E.New("fallback disabled for ALPN: ", connectionState.NegotiatedProtocol)
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}
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}
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}
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}
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if !fallbackAddr.IsValid() {
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fallbackAddr = h.fallbackAddr
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}
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h.logger.InfoContext(ctx, "fallback connection to ", fallbackAddr)
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metadata.Destination = fallbackAddr
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return h.router.RouteConnection(ctx, conn, metadata)
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}
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@ -2,10 +2,11 @@ package option
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type TrojanInboundOptions struct {
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ListenOptions
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Users []TrojanUser `json:"users,omitempty"`
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TLS *InboundTLSOptions `json:"tls,omitempty"`
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Fallback *ServerOptions `json:"fallback,omitempty"`
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Transport *V2RayTransportOptions `json:"transport,omitempty"`
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Users []TrojanUser `json:"users,omitempty"`
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TLS *InboundTLSOptions `json:"tls,omitempty"`
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Fallback *ServerOptions `json:"fallback,omitempty"`
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FallbackForALPN map[string]*ServerOptions `json:"fallback_for_alpn,omitempty"`
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Transport *V2RayTransportOptions `json:"transport,omitempty"`
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}
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type TrojanUser struct {
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