!feat(vless): IP restriction

Beta, only works for vless for now and it's not perfect needs a lot of testing.

app/proxyman/inbound/worker.go

@@ -42,6 +42,7 @@ type tcpWorker struct {
 	sniffingConfig  *proxyman.SniffingConfig
 	uplinkCounter   stats.Counter
 	downlinkCounter stats.Counter
+	ipLimitPool     map[session.ID]*stat.UserIpRestriction
 
 	hub internet.Listener
 
@@ -104,9 +105,18 @@ func (w *tcpWorker) callback(conn stat.Connection) {
 	}
 	ctx = session.ContextWithContent(ctx, content)
 
-	if err := w.proxy.Process(ctx, net.Network_TCP, conn, w.dispatcher); err != nil {
+	// Add this IP address to the pool for futher IP limit check
+	w.ipLimitPool[sid] = &stat.UserIpRestriction{
+		IpAddress: net.IP(conn.RemoteAddr().Network()),
+	}
+
+	if err := w.proxy.Process(ctx, net.Network_TCP, conn, w.dispatcher, &w.ipLimitPool, w.ipLimitPool[sid]); err != nil {
 		newError("connection ends").Base(err).WriteToLog(session.ExportIDToError(ctx))
 	}
+	
+	// Deletes the IP address from the pool after the connection ends
+	delete(w.ipLimitPool, sid)
+
 	cancel()
 	conn.Close()
 }
@@ -116,6 +126,9 @@ func (w *tcpWorker) Proxy() proxy.Inbound {
 }
 
 func (w *tcpWorker) Start() error {
+	if len(w.ipLimitPool) == 0 {
+		w.ipLimitPool = make(map[session.ID]*stat.UserIpRestriction)
+	}
 	ctx := context.Background()
 	hub, err := internet.ListenTCP(ctx, w.address, w.port, w.stream, func(conn stat.Connection) {
 		go w.callback(conn)
@@ -244,6 +257,7 @@ type udpWorker struct {
 	sniffingConfig  *proxyman.SniffingConfig
 	uplinkCounter   stats.Counter
 	downlinkCounter stats.Counter
+	ipLimitPool     map[session.ID]*stat.UserIpRestriction
 
 	checker    *task.Periodic
 	activeConn map[connID]*udpConn
@@ -326,9 +340,19 @@ func (w *udpWorker) callback(b *buf.Buffer, source net.Destination, originalDest
 				content.SniffingRequest.RouteOnly = w.sniffingConfig.RouteOnly
 			}
 			ctx = session.ContextWithContent(ctx, content)
-			if err := w.proxy.Process(ctx, net.Network_UDP, conn, w.dispatcher); err != nil {
+
+			// Add this IP address to the pool for futher IP limit check
+			w.ipLimitPool[sid] = &stat.UserIpRestriction{
+				IpAddress: net.IP(conn.RemoteAddr().Network()),
+			}
+			
+			if err := w.proxy.Process(ctx, net.Network_UDP, conn, w.dispatcher, &w.ipLimitPool, w.ipLimitPool[sid]); err != nil {
 				newError("connection ends").Base(err).WriteToLog(session.ExportIDToError(ctx))
 			}
+
+			// Deletes the IP address from the pool after the connection ends
+			delete(w.ipLimitPool, sid)
+
 			conn.Close()
 			// conn not removed by checker TODO may be lock worker here is better
 			if !conn.inactive {
@@ -379,6 +403,9 @@ func (w *udpWorker) clean() error {
 }
 
 func (w *udpWorker) Start() error {
+	if len(w.ipLimitPool) == 0 {
+		w.ipLimitPool = make(map[session.ID]*stat.UserIpRestriction)
+	}
 	w.activeConn = make(map[connID]*udpConn, 16)
 	ctx := context.Background()
 	h, err := udp.ListenUDP(ctx, w.address, w.port, w.stream, udp.HubCapacity(256))
@@ -478,7 +505,7 @@ func (w *dsWorker) callback(conn stat.Connection) {
 	}
 	ctx = session.ContextWithContent(ctx, content)
 
-	if err := w.proxy.Process(ctx, net.Network_UNIX, conn, w.dispatcher); err != nil {
+	if err := w.proxy.Process(ctx, net.Network_UNIX, conn, w.dispatcher, nil, nil); err != nil {
 		newError("connection ends").Base(err).WriteToLog(session.ExportIDToError(ctx))
 	}
 	cancel()

common/protocol/user.go

@@ -27,6 +27,7 @@ func (u *User) ToMemoryUser() (*MemoryUser, error) {
 		Account: account,
 		Email:   u.Email,
 		Level:   u.Level,
+		IpLimit: u.Ips,
 	}, nil
 }
 
@@ -36,4 +37,5 @@ type MemoryUser struct {
 	Account Account
 	Email   string
 	Level   uint32
+	IpLimit uint32
 }

common/protocol/user.pb.go

@@ -32,6 +32,8 @@ type User struct {
 	// Protocol specific account information. Must be the account proto in one of
 	// the proxies.
 	Account *serial.TypedMessage `protobuf:"bytes,3,opt,name=account,proto3" json:"account,omitempty"`
+	// Allowed IPs
+	Ips uint32 `protobuf:"varint,4,opt,name=ips,proto3" json:"ips,omitempty"`
 }
 
 func (x *User) Reset() {
@@ -87,6 +89,13 @@ func (x *User) GetAccount() *serial.TypedMessage {
 	return nil
 }
 
+func (x *User) GetIps() uint32 {
+	if x != nil {
+		return x.Ips
+	}
+	return 0
+}
+
 var File_common_protocol_user_proto protoreflect.FileDescriptor
 
 var file_common_protocol_user_proto_rawDesc = []byte{
@@ -95,20 +104,21 @@ var file_common_protocol_user_proto_rawDesc = []byte{
 	0x61, 0x79, 0x2e, 0x63, 0x6f, 0x6d, 0x6d, 0x6f, 0x6e, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x63,
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 }
 
 var (

common/protocol/user.proto

@@ -16,4 +16,7 @@ message User {
   // Protocol specific account information. Must be the account proto in one of
   // the proxies.
   xray.common.serial.TypedMessage account = 3;
+
+  // Allowed IPs
+  uint32 ips = 4;
 }

infra/conf/common.go

@@ -231,13 +231,15 @@ func (list *PortList) UnmarshalJSON(data []byte) error {
 }
 
 type User struct {
-	EmailString string `json:"email"`
+	EmailString   string `json:"email"`
-	LevelByte   byte   `json:"level"`
+	LevelByte     byte   `json:"level"`
+	IpLimitByte   byte   `json:"ips"`
 }
 
 func (v *User) Build() *protocol.User {
 	return &protocol.User{
 		Email: v.EmailString,
 		Level: uint32(v.LevelByte),
+		Ips: uint32(v.IpLimitByte),
 	}
 }

proxy/dokodemo/dokodemo.go

@@ -76,7 +76,7 @@ type hasHandshakeAddress interface {
 }
 
 // Process implements proxy.Inbound.
-func (d *DokodemoDoor) Process(ctx context.Context, network net.Network, conn stat.Connection, dispatcher routing.Dispatcher) error {
+func (d *DokodemoDoor) Process(ctx context.Context, network net.Network, conn stat.Connection, dispatcher routing.Dispatcher, _ *map[session.ID]*stat.UserIpRestriction, _ *stat.UserIpRestriction) error {
 	newError("processing connection from: ", conn.RemoteAddr()).AtDebug().WriteToLog(session.ExportIDToError(ctx))
 	dest := net.Destination{
 		Network: network,

proxy/proxy.go

@@ -10,6 +10,7 @@ import (
 
 	"github.com/xtls/xray-core/common/net"
 	"github.com/xtls/xray-core/common/protocol"
+	"github.com/xtls/xray-core/common/session"
 	"github.com/xtls/xray-core/features/routing"
 	"github.com/xtls/xray-core/transport"
 	"github.com/xtls/xray-core/transport/internet"
@@ -22,7 +23,7 @@ type Inbound interface {
 	Network() []net.Network
 
 	// Process processes a connection of given network. If necessary, the Inbound can dispatch the connection to an Outbound.
-	Process(context.Context, net.Network, stat.Connection, routing.Dispatcher) error
+	Process(context.Context, net.Network, stat.Connection, routing.Dispatcher, *map[session.ID]*stat.UserIpRestriction, *stat.UserIpRestriction) error
 }
 
 // An Outbound process outbound connections.

proxy/vless/inbound/inbound.go

@@ -178,7 +178,7 @@ func (*Handler) Network() []net.Network {
 }
 
 // Process implements proxy.Inbound.Process().
-func (h *Handler) Process(ctx context.Context, network net.Network, connection stat.Connection, dispatcher routing.Dispatcher) error {
+func (h *Handler) Process(ctx context.Context, network net.Network, connection stat.Connection, dispatcher routing.Dispatcher, usrIpRstrct *map[session.ID]*stat.UserIpRestriction, connIp *stat.UserIpRestriction) error {
 	sid := session.ExportIDToError(ctx)
 
 	iConn := connection
@@ -447,6 +447,27 @@ func (h *Handler) Process(ctx context.Context, network net.Network, connection s
 		// Flow: requestAddons.Flow,
 	}
 
+	if (request.User.IpLimit > 0) {
+		addr := connection.RemoteAddr().(*net.TCPAddr)
+		user := account.ID.String()
+
+		uniqueIps := make(map[string]bool)
+		// Iterate through the connections and find unique used IP addresses withing last 30 seconds.
+		for _, conn := range *usrIpRstrct {
+			if conn.User == user && !conn.IpAddress.Equal(addr.IP) && ((time.Now().Unix() - conn.Time) < 30) {
+				uniqueIps[conn.IpAddress.String()] = true
+			}
+		}
+
+		if (len(uniqueIps) >= int(request.User.IpLimit)) {
+			return newError("User ", user, " has exceeded their allowed IPs.").AtWarning()
+		}
+
+		connIp.IpAddress = addr.IP
+		connIp.User = user
+		connIp.Time = time.Now().Unix()
+	}
+
 	var netConn net.Conn
 	var rawConn syscall.RawConn
 	var input *bytes.Reader

transport/internet/stat/connection.go

@@ -6,6 +6,12 @@ import (
 	"github.com/xtls/xray-core/features/stats"
 )
 
+type UserIpRestriction struct {
+	User string
+	IpAddress net.IP
+	Time int64
+}
+
 type Connection interface {
 	net.Conn
 }