mirror of
https://github.com/ehang-io/nps.git
synced 2025-09-02 11:56:53 +00:00
客户端配置，端口白名单等
This commit is contained in:
刘河
298
server/proxy/socks5.go
Executable file
298
server/proxy/socks5.go
Executable file
@@ -0,0 +1,298 @@
|
||||
package proxy
|
||||
|
||||
import (
|
||||
"encoding/binary"
|
||||
"errors"
|
||||
"github.com/cnlh/nps/bridge"
|
||||
"github.com/cnlh/nps/lib/common"
|
||||
"github.com/cnlh/nps/lib/conn"
|
||||
"github.com/cnlh/nps/lib/file"
|
||||
"github.com/cnlh/nps/lib/lg"
|
||||
"io"
|
||||
"net"
|
||||
"strconv"
|
||||
"strings"
|
||||
)
|
||||
|
||||
const (
|
||||
ipV4 = 1
|
||||
domainName = 3
|
||||
ipV6 = 4
|
||||
connectMethod = 1
|
||||
bindMethod = 2
|
||||
associateMethod = 3
|
||||
// The maximum packet size of any udp Associate packet, based on ethernet's max size,
|
||||
// minus the IP and UDP headers. IPv4 has a 20 byte header, UDP adds an
|
||||
// additional 4 bytes. This is a total overhead of 24 bytes. Ethernet's
|
||||
// max packet size is 1500 bytes, 1500 - 24 = 1476.
|
||||
maxUDPPacketSize = 1476
|
||||
)
|
||||
|
||||
const (
|
||||
succeeded uint8 = iota
|
||||
serverFailure
|
||||
notAllowed
|
||||
networkUnreachable
|
||||
hostUnreachable
|
||||
connectionRefused
|
||||
ttlExpired
|
||||
commandNotSupported
|
||||
addrTypeNotSupported
|
||||
)
|
||||
|
||||
const (
|
||||
UserPassAuth = uint8(2)
|
||||
userAuthVersion = uint8(1)
|
||||
authSuccess = uint8(0)
|
||||
authFailure = uint8(1)
|
||||
)
|
||||
|
||||
type Sock5ModeServer struct {
|
||||
server
|
||||
isVerify bool
|
||||
listener net.Listener
|
||||
}
|
||||
|
||||
//req
|
||||
func (s *Sock5ModeServer) handleRequest(c net.Conn) {
|
||||
/*
|
||||
The SOCKS request is formed as follows:
|
||||
+----+-----+-------+------+----------+----------+
|
||||
|VER | CMD | RSV | ATYP | DST.ADDR | DST.PORT |
|
||||
+----+-----+-------+------+----------+----------+
|
||||
| 1 | 1 | X'00' | 1 | Variable | 2 |
|
||||
+----+-----+-------+------+----------+----------+
|
||||
*/
|
||||
header := make([]byte, 3)
|
||||
|
||||
_, err := io.ReadFull(c, header)
|
||||
|
||||
if err != nil {
|
||||
lg.Println("illegal request", err)
|
||||
c.Close()
|
||||
return
|
||||
}
|
||||
|
||||
switch header[1] {
|
||||
case connectMethod:
|
||||
s.handleConnect(c)
|
||||
case bindMethod:
|
||||
s.handleBind(c)
|
||||
case associateMethod:
|
||||
s.handleUDP(c)
|
||||
default:
|
||||
s.sendReply(c, commandNotSupported)
|
||||
c.Close()
|
||||
}
|
||||
}
|
||||
|
||||
//reply
|
||||
func (s *Sock5ModeServer) sendReply(c net.Conn, rep uint8) {
|
||||
reply := []byte{
|
||||
5,
|
||||
rep,
|
||||
0,
|
||||
1,
|
||||
}
|
||||
|
||||
localAddr := c.LocalAddr().String()
|
||||
localHost, localPort, _ := net.SplitHostPort(localAddr)
|
||||
ipBytes := net.ParseIP(localHost).To4()
|
||||
nPort, _ := strconv.Atoi(localPort)
|
||||
reply = append(reply, ipBytes...)
|
||||
portBytes := make([]byte, 2)
|
||||
binary.BigEndian.PutUint16(portBytes, uint16(nPort))
|
||||
reply = append(reply, portBytes...)
|
||||
|
||||
c.Write(reply)
|
||||
}
|
||||
|
||||
//do conn
|
||||
func (s *Sock5ModeServer) doConnect(c net.Conn, command uint8) {
|
||||
addrType := make([]byte, 1)
|
||||
c.Read(addrType)
|
||||
var host string
|
||||
switch addrType[0] {
|
||||
case ipV4:
|
||||
ipv4 := make(net.IP, net.IPv4len)
|
||||
c.Read(ipv4)
|
||||
host = ipv4.String()
|
||||
case ipV6:
|
||||
ipv6 := make(net.IP, net.IPv6len)
|
||||
c.Read(ipv6)
|
||||
host = ipv6.String()
|
||||
case domainName:
|
||||
var domainLen uint8
|
||||
binary.Read(c, binary.BigEndian, &domainLen)
|
||||
domain := make([]byte, domainLen)
|
||||
c.Read(domain)
|
||||
host = string(domain)
|
||||
default:
|
||||
s.sendReply(c, addrTypeNotSupported)
|
||||
return
|
||||
}
|
||||
|
||||
var port uint16
|
||||
binary.Read(c, binary.BigEndian, &port)
|
||||
// connect to host
|
||||
addr := net.JoinHostPort(host, strconv.Itoa(int(port)))
|
||||
var ltype string
|
||||
if command == associateMethod {
|
||||
ltype = common.CONN_UDP
|
||||
} else {
|
||||
ltype = common.CONN_TCP
|
||||
}
|
||||
link := conn.NewLink(s.task.Client.GetId(), ltype, addr, s.task.Client.Cnf.CompressEncode, s.task.Client.Cnf.CompressDecode, s.task.Client.Cnf.Crypt, conn.NewConn(c), s.task.Flow, nil, s.task.Client.Rate, nil)
|
||||
|
||||
if tunnel, err := s.bridge.SendLinkInfo(s.task.Client.Id, link); err != nil {
|
||||
c.Close()
|
||||
return
|
||||
} else {
|
||||
s.sendReply(c, succeeded)
|
||||
s.linkCopy(link, conn.NewConn(c), nil, tunnel, s.task.Flow)
|
||||
}
|
||||
return
|
||||
}
|
||||
|
||||
//conn
|
||||
func (s *Sock5ModeServer) handleConnect(c net.Conn) {
|
||||
s.doConnect(c, connectMethod)
|
||||
}
|
||||
|
||||
// passive mode
|
||||
func (s *Sock5ModeServer) handleBind(c net.Conn) {
|
||||
}
|
||||
|
||||
//udp
|
||||
func (s *Sock5ModeServer) handleUDP(c net.Conn) {
|
||||
lg.Println("UDP Associate")
|
||||
/*
|
||||
+----+------+------+----------+----------+----------+
|
||||
|RSV | FRAG | ATYP | DST.ADDR | DST.PORT | DATA |
|
||||
+----+------+------+----------+----------+----------+
|
||||
| 2 | 1 | 1 | Variable | 2 | Variable |
|
||||
+----+------+------+----------+----------+----------+
|
||||
*/
|
||||
buf := make([]byte, 3)
|
||||
c.Read(buf)
|
||||
// relay udp datagram silently, without any notification to the requesting client
|
||||
if buf[2] != 0 {
|
||||
// does not support fragmentation, drop it
|
||||
lg.Println("does not support fragmentation, drop")
|
||||
dummy := make([]byte, maxUDPPacketSize)
|
||||
c.Read(dummy)
|
||||
}
|
||||
|
||||
s.doConnect(c, associateMethod)
|
||||
}
|
||||
|
||||
//new conn
|
||||
func (s *Sock5ModeServer) handleConn(c net.Conn) {
|
||||
buf := make([]byte, 2)
|
||||
if _, err := io.ReadFull(c, buf); err != nil {
|
||||
lg.Println("negotiation err", err)
|
||||
c.Close()
|
||||
return
|
||||
}
|
||||
|
||||
if version := buf[0]; version != 5 {
|
||||
lg.Println("only support socks5, request from: ", c.RemoteAddr())
|
||||
c.Close()
|
||||
return
|
||||
}
|
||||
nMethods := buf[1]
|
||||
|
||||
methods := make([]byte, nMethods)
|
||||
if len, err := c.Read(methods); len != int(nMethods) || err != nil {
|
||||
lg.Println("wrong method")
|
||||
c.Close()
|
||||
return
|
||||
}
|
||||
if s.isVerify {
|
||||
buf[1] = UserPassAuth
|
||||
c.Write(buf)
|
||||
if err := s.Auth(c); err != nil {
|
||||
c.Close()
|
||||
lg.Println("验证失败：", err)
|
||||
return
|
||||
}
|
||||
} else {
|
||||
buf[1] = 0
|
||||
c.Write(buf)
|
||||
}
|
||||
s.handleRequest(c)
|
||||
}
|
||||
|
||||
//socks5 auth
|
||||
func (s *Sock5ModeServer) Auth(c net.Conn) error {
|
||||
header := []byte{0, 0}
|
||||
if _, err := io.ReadAtLeast(c, header, 2); err != nil {
|
||||
return err
|
||||
}
|
||||
if header[0] != userAuthVersion {
|
||||
return errors.New("验证方式不被支持")
|
||||
}
|
||||
userLen := int(header[1])
|
||||
user := make([]byte, userLen)
|
||||
if _, err := io.ReadAtLeast(c, user, userLen); err != nil {
|
||||
return err
|
||||
}
|
||||
if _, err := c.Read(header[:1]); err != nil {
|
||||
return errors.New("密码长度获取错误")
|
||||
}
|
||||
passLen := int(header[0])
|
||||
pass := make([]byte, passLen)
|
||||
if _, err := io.ReadAtLeast(c, pass, passLen); err != nil {
|
||||
return err
|
||||
}
|
||||
if string(pass) == s.task.Client.Cnf.U && string(user) == s.task.Client.Cnf.P {
|
||||
if _, err := c.Write([]byte{userAuthVersion, authSuccess}); err != nil {
|
||||
return err
|
||||
}
|
||||
return nil
|
||||
} else {
|
||||
if _, err := c.Write([]byte{userAuthVersion, authFailure}); err != nil {
|
||||
return err
|
||||
}
|
||||
return errors.New("验证不通过")
|
||||
}
|
||||
return errors.New("未知错误")
|
||||
}
|
||||
|
||||
//start
|
||||
func (s *Sock5ModeServer) Start() error {
|
||||
var err error
|
||||
s.listener, err = net.Listen("tcp", ":"+strconv.Itoa(s.task.Port))
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
for {
|
||||
conn, err := s.listener.Accept()
|
||||
if err != nil {
|
||||
if strings.Contains(err.Error(), "use of closed network connection") {
|
||||
break
|
||||
}
|
||||
lg.Fatalln("accept error: ", err)
|
||||
}
|
||||
go s.handleConn(conn)
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
//close
|
||||
func (s *Sock5ModeServer) Close() error {
|
||||
return s.listener.Close()
|
||||
}
|
||||
|
||||
//new
|
||||
func NewSock5ModeServer(bridge *bridge.Bridge, task *file.Tunnel) *Sock5ModeServer {
|
||||
s := new(Sock5ModeServer)
|
||||
s.bridge = bridge
|
||||
s.task = task
|
||||
if s.task.Client.Cnf.U != "" && s.task.Client.Cnf.P != "" {
|
||||
s.isVerify = true
|
||||
} else {
|
||||
s.isVerify = false
|
||||
}
|
||||
return s
|
||||
}
|
||||
Reference in New Issue
Block a user