397 lines
8.8 KiB
Go
397 lines
8.8 KiB
Go
package main
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import (
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"bufio"
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"context"
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"encoding/binary"
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"github.com/joho/godotenv"
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"github.com/pkg/errors"
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"io"
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"log/slog"
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"net"
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"os"
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"proxy-server/pkg/socks5"
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"proxy-server/pkg/utils"
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"proxy-server/server/orm"
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"proxy-server/server/web/app/models"
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"strconv"
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"time"
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)
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var connMap = make(map[string]socks5.ProxyData)
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func main() {
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slog.SetLogLoggerLevel(slog.LevelDebug)
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// 初始化环境变量
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err := godotenv.Load()
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if err != nil {
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slog.Debug("没有本地环境变量文件")
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}
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orm.Init()
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go startControlTun()
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go startDataTun()
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select {}
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}
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func startDataTun() {
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dataPort := os.Getenv("APP_DATA_PORT")
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if dataPort == "" {
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panic("环境变量 APP_DATA_PORT 未设置")
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}
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slog.Info("监听数据端口 " + dataPort)
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lData, err := net.Listen("tcp", ":"+dataPort)
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if err != nil {
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slog.Error("listen error", err)
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return
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}
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defer lData.Close()
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for {
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conn, err := lData.Accept()
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if err != nil {
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slog.Error("accept error", err)
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return
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}
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processDataConn(conn)
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}
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}
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func processDataConn(client net.Conn) {
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slog.Info("已建立客户端数据通道 " + client.RemoteAddr().String())
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// 读取 tag
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tagLen, err := utils.ReadByte(client)
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if err != nil {
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slog.Error("read error", err)
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return
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}
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tagBuf, err := utils.ReadBuffer(client, int(tagLen))
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if err != nil {
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slog.Error("read error", err)
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return
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}
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tag := string(tagBuf)
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// 找到用户连接
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data, ok := connMap[tag]
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if !ok {
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slog.Error("no such connection")
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return
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}
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// 响应用户
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user := data.Conn
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socks5.SendSuccess(user, client)
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// 写入目标地址
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_, err = client.Write([]byte{byte(len(data.Dest))})
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if err != nil {
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slog.Error("写入目标地址失败", err)
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return
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}
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_, err = client.Write([]byte(data.Dest))
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if err != nil {
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slog.Error("写入目标地址失败", err)
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return
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}
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// 数据转发
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slog.Info("开始数据转发 " + client.RemoteAddr().String() + " <-> " + data.Dest)
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errCh := make(chan error)
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go func() {
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_, err := io.Copy(client, user)
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if err != nil {
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slog.Error("processDataConn error c2u", err)
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}
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errCh <- err
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}()
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go func() {
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_, err := io.Copy(user, client)
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if err != nil {
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slog.Error("processDataConn error u2c", err)
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}
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errCh <- err
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}()
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<-errCh
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slog.Info("数据转发结束 " + client.RemoteAddr().String() + " <-> " + data.Dest)
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defer func() {
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err := user.Close()
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if err != nil {
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slog.Error("close error", err)
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}
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err = client.Close()
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if err != nil {
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slog.Error("close error", err)
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}
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}()
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}
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func startControlTun() {
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ctrlPort := os.Getenv("APP_CTRL_PORT")
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if ctrlPort == "" {
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panic("环境变量 APP_CTRL_PORT 未设置")
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}
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slog.Info("监听控制端口 " + ctrlPort)
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lControl, err := net.Listen("tcp", ":"+ctrlPort)
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if err != nil {
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slog.Error("listen error", err)
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return
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}
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defer lControl.Close()
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for {
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conn, err := lControl.Accept()
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if err != nil {
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slog.Error("accept error", err)
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return
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}
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go processController(conn)
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}
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}
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func processController(controller net.Conn) {
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defer controller.Close()
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slog.Info("收到客户端控制连接 " + controller.RemoteAddr().String())
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reader := bufio.NewReader(controller)
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// 读取端口
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portBuf := make([]byte, 2)
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_, err := io.ReadFull(reader, portBuf)
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if err != nil {
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slog.Error("读取转发端口失败", "err", err)
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return
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}
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port := binary.BigEndian.Uint16(portBuf)
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// 新建代理服务
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slog.Info("新建代理服务", "port", port)
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proxy, err := socks5.New(&socks5.Config{
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Name: strconv.Itoa(int(port)),
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Port: port,
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AuthMethods: []socks5.Authenticator{
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&UserPassAuthenticator{},
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&NoAuthAuthenticator{},
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},
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})
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if err != nil {
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slog.Error("代理服务创建失败", err)
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return
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}
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go func() {
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err := proxy.Run()
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if err != nil {
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slog.Error("代理服务建立失败", err)
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return
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}
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}()
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slog.Info("代理服务已建立", "port", port)
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for {
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user := <-proxy.Conn
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tag := user.Tag()
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_, err := controller.Write([]byte{byte(len(tag))})
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if err != nil {
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slog.Error("write error", err)
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return
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}
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_, err = controller.Write([]byte(tag))
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slog.Info("已通知客户端建立数据通道")
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if err != nil {
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slog.Error("write error", err)
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return
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}
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connMap[tag] = user
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}
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}
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type NoAuthAuthenticator struct {
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}
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func (a *NoAuthAuthenticator) Method() socks5.AuthMethod {
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return socks5.NoAuth
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}
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func (a *NoAuthAuthenticator) Authenticate(ctx context.Context, reader io.Reader, writer io.Writer) (*socks5.AuthContext, error) {
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// 检查用户是否在白名单中，如果不在则返回错误
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conn, ok := writer.(net.Conn)
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if !ok {
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return nil, errors.New("noAuth 认证失败，无法获取连接信息")
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}
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addr := conn.RemoteAddr().String()
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client, _, err := net.SplitHostPort(addr)
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if err != nil {
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return nil, errors.Wrap(err, "noAuth 认证失败")
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}
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slog.Info("用户的地址为 " + client)
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// 检查此 ip 是否有权限访问目标 node
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server, ok := ctx.Value("service").(*socks5.Server)
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if !ok {
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return nil, errors.New("noAuth 认证失败，无法获取服务信息")
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}
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node := server.Name
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slog.Debug(" 客户端 " + client + " 请求连接到 " + node)
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var channels []models.Channel
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err = orm.DB.
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Joins("INNER JOIN public.nodes n ON channels.node_id = n.id AND n.name = ?", node).
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Joins("INNER JOIN public.users u ON channels.user_id = u.id").
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Joins("INNER JOIN public.user_ips ip ON u.id = ip.user_id AND ip.ip_address = ?", client).
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Find(&channels).Error
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if err != nil {
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return nil, errors.New("noAuth 认证失败，查询用户权限失败")
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}
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if len(channels) == 0 {
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return nil, errors.New("noAuth 认证失败，没有权限")
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}
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if len(channels) > 1 {
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slog.Warn(client + " + " + node + "的组合有多个权限结果，这是不应当存在的")
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}
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channel := channels[0]
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if !channel.AuthIp {
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return nil, errors.New("noAuth 认证失败，没有权限")
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}
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if channel.Expiration.Before(time.Now()) {
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return nil, errors.New("noAuth 认证失败，权限已过期")
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}
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return &socks5.AuthContext{
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Method: socks5.NoAuth,
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Timeout: 300, // todo
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Payload: nil,
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}, nil
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}
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type UserPassAuthenticator struct {
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}
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func (a *UserPassAuthenticator) Method() socks5.AuthMethod {
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return socks5.UserPassAuth
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}
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func (a *UserPassAuthenticator) Authenticate(ctx context.Context, reader io.Reader, writer io.Writer) (*socks5.AuthContext, error) {
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// 检查版本
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v, err := utils.ReadByte(reader)
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if err != nil {
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return nil, errors.Wrap(err, "读取版本号失败")
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}
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if v != socks5.AuthVersion {
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_, err := writer.Write([]byte{socks5.SocksVersion, socks5.AuthFailure})
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if err != nil {
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return nil, errors.Wrap(err, "响应认证失败")
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}
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return nil, errors.New("认证版本参数不正确")
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}
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// 读取账号
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uLen, err := utils.ReadByte(reader)
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if err != nil {
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return nil, errors.Wrap(err, "读取用户名长度失败")
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}
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usernameBuf, err := utils.ReadBuffer(reader, int(uLen))
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if err != nil {
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return nil, errors.Wrap(err, "读取用户名失败")
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}
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username := string(usernameBuf)
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// 读取密码
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pLen, err := utils.ReadByte(reader)
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if err != nil {
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return nil, errors.Wrap(err, "读取密码长度失败")
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}
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passwordBuf, err := utils.ReadBuffer(reader, int(pLen))
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if err != nil {
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return nil, errors.Wrap(err, "读取密码失败")
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}
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password := string(passwordBuf)
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var channels []models.Channel
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err = orm.DB.
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Where(&models.Channel{
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Username: username,
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}).
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Find(&channels).Error
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if err != nil {
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return nil, errors.Wrap(err, "查询用户失败")
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}
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if len(channels) == 0 {
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return nil, errors.New("没有权限")
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}
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if len(channels) > 1 {
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slog.Warn("用户有多个权限结果，这是不应当存在的")
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}
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channel := channels[0]
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if !channel.AuthPass {
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return nil, errors.New("没有权限")
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}
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if channel.Expiration.Before(time.Now()) {
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return nil, errors.New("权限已过期")
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}
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// 检查密码 todo 哈希
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if channel.Password != password {
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return nil, errors.New("密码错误")
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}
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// 如果用户设置了双验证则检查 ip 是否在白名单中
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if channel.AuthIp {
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conn, ok := writer.(net.Conn)
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if !ok {
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return nil, errors.New("无法获取连接信息")
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}
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addr := conn.RemoteAddr().String()
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client, _, err := net.SplitHostPort(addr)
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if err != nil {
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return nil, errors.Wrap(err, "无法获取连接信息")
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}
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slog.Info("用户的地址为 " + client)
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var ips []models.UserIp
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err = orm.DB.
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Where(&models.UserIp{
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UserId: channel.UserId,
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IpAddress: client,
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}).
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Find(&ips).Error
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if err != nil {
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return nil, errors.Wrap(err, "查询用户 ip 失败")
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}
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if len(ips) == 0 {
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return nil, errors.New("没有权限")
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}
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}
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_, err = writer.Write([]byte{socks5.AuthVersion, socks5.AuthSuccess})
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if err != nil {
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slog.Error("响应认证失败", err)
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return nil, err
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}
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return &socks5.AuthContext{
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Method: socks5.UserPassAuth,
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Timeout: 300, // todo
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Payload: nil,
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}, nil
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}
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