Add "xudpProxyUDP443" to Mux config & XUDP rejects UDP/443 traffic by default (client side, excluding reverse proxy)

app/proxyman/config.pb.go

@@ -597,6 +597,8 @@ type MultiplexingConfig struct {
 	Concurrency int32 `protobuf:"varint,2,opt,name=concurrency,proto3" json:"concurrency,omitempty"`
 	// Transport XUDP in another Mux.
 	XudpConcurrency int32 `protobuf:"varint,3,opt,name=xudpConcurrency,proto3" json:"xudpConcurrency,omitempty"`
+	// "reject" (default), "allow" or "skip".
+	XudpProxyUDP443 string `protobuf:"bytes,4,opt,name=xudpProxyUDP443,proto3" json:"xudpProxyUDP443,omitempty"`
 }
 
 func (x *MultiplexingConfig) Reset() {
@@ -652,6 +654,13 @@ func (x *MultiplexingConfig) GetXudpConcurrency() int32 {
 	return 0
 }
 
+func (x *MultiplexingConfig) GetXudpProxyUDP443() string {
+	if x != nil {
+		return x.XudpProxyUDP443
+	}
+	return ""
+}
+
 type AllocationStrategy_AllocationStrategyConcurrency struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -865,23 +874,26 @@ var file_app_proxyman_config_proto_rawDesc = []byte{
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 }
 
 var (

app/proxyman/config.proto

@@ -100,4 +100,6 @@ message MultiplexingConfig {
   int32 concurrency = 2;
   // Transport XUDP in another Mux.
   int32 xudpConcurrency = 3;
+  // "reject" (default), "allow" or "skip".
+  string xudpProxyUDP443 = 4;
 }

app/proxyman/outbound/handler.go

@@ -58,6 +58,7 @@ type Handler struct {
 	outboundManager outbound.Manager
 	mux             *mux.ClientManager
 	xudp            *mux.ClientManager
+	udp443          string
 	uplinkCounter   stats.Counter
 	downlinkCounter stats.Counter
 }
@@ -150,6 +151,7 @@ func NewHandler(ctx context.Context, config *core.OutboundHandlerConfig) (outbou
 					},
 				}
 			}
+			h.udp443 = config.XudpProxyUDP443
 		}
 	}
 
@@ -173,7 +175,17 @@ func (h *Handler) Dispatch(ctx context.Context, link *transport.Link) {
 				common.Interrupt(link.Writer)
 			}
 		}
-		if h.xudp != nil && session.OutboundFromContext(ctx).Target.Network == net.Network_UDP {
+		outbound := session.OutboundFromContext(ctx)
+		if outbound.Target.Network == net.Network_UDP && outbound.Target.Port == 443 {
+			switch h.udp443 {
+			case "reject":
+				test(newError("XUDP rejected UDP/443 traffic").AtInfo())
+				return
+			case "skip":
+				goto out
+			}
+		}
+		if h.xudp != nil && outbound.Target.Network == net.Network_UDP {
 			if !h.xudp.Enabled {
 				goto out
 			}

infra/conf/xray.go

@@ -110,14 +110,23 @@ type MuxConfig struct {
 	Enabled         bool   `json:"enabled"`
 	Concurrency     int16  `json:"concurrency"`
 	XudpConcurrency int16  `json:"xudpConcurrency"`
+	XudpProxyUDP443 string `json:"xudpProxyUDP443"`
 }
 
 // Build creates MultiplexingConfig, Concurrency < 0 completely disables mux.
 func (m *MuxConfig) Build() (*proxyman.MultiplexingConfig, error) {
+	switch m.XudpProxyUDP443 {
+	case "":
+		m.XudpProxyUDP443 = "reject"
+	case "reject", "allow", "skip":
+	default:
+		return nil, newError(`unknown "xudpProxyUDP443": `, m.XudpProxyUDP443)
+	}
 	return &proxyman.MultiplexingConfig{
 		Enabled:         m.Enabled,
 		Concurrency:     int32(m.Concurrency),
 		XudpConcurrency: int32(m.XudpConcurrency),
+		XudpProxyUDP443: m.XudpProxyUDP443,
 	}, nil
 }
 

infra/conf/xray_test.go

@@ -342,18 +342,26 @@ func TestMuxConfig_Build(t *testing.T) {
 		{"default", `{"enabled": true, "concurrency": 16}`, &proxyman.MultiplexingConfig{
 			Enabled:         true,
 			Concurrency:     16,
+			XudpConcurrency: 0,
+			XudpProxyUDP443: "reject",
 		}},
 		{"empty def", `{}`, &proxyman.MultiplexingConfig{
 			Enabled:         false,
 			Concurrency:     0,
+			XudpConcurrency: 0,
+			XudpProxyUDP443: "reject",
 		}},
 		{"not enable", `{"enabled": false, "concurrency": 4}`, &proxyman.MultiplexingConfig{
 			Enabled:         false,
 			Concurrency:     4,
+			XudpConcurrency: 0,
+			XudpProxyUDP443: "reject",
 		}},
 		{"forbidden", `{"enabled": false, "concurrency": -1}`, &proxyman.MultiplexingConfig{
 			Enabled:         false,
 			Concurrency:     -1,
+			XudpConcurrency: 0,
+			XudpProxyUDP443: "reject",
 		}},
 	}
 	for _, tt := range tests {