go语言实现SSH服务器不允许sftp不允许代理转发不允许x11转发不允许执行任何命令允许服务器60000端口转发到本地10000端口

以下是一个简单的Go语言实现SSH服务器的示例代码，实现了不允许sftp，不允许代理转发，不允许x11转发，不允许执行任何命令的功能，同时允许服务器60000端口转发到本地10000端口。

注意：此示例代码仅供参考，实际应用中需要根据具体需求进行修改和完善。

package main

import (
    "fmt"
    "io"
    "io/ioutil"
    "log"
    "net"
    "os"
    "os/exec"
    "strings"

    "golang.org/x/crypto/ssh"
)

func main() {
    // 配置SSH服务器
    sshConfig := &ssh.ServerConfig{
        NoClientAuth: true,
        MaxAuthTries: 0, // 禁用连接尝试次数限制
        // 设置认证方法，这里使用无密码认证
        KeyboardInteractiveCallback: func(conn ssh.ConnMetadata, client ssh.KeyboardInteractiveChallenge) (*ssh.Permissions, error) {
            return nil, nil
        },
    }

    // 生成SSH服务器私钥
    privateKey, err := ioutil.ReadFile("ssh_server_key")
    if err != nil {
        log.Fatalf("Failed to load private key: %v", err)
    }
    sshPrivateKey, err := ssh.ParsePrivateKey(privateKey)
    if err != nil {
        log.Fatalf("Failed to parse private key: %v", err)
    }
    sshConfig.AddHostKey(sshPrivateKey)

    // 监听SSH连接
    listener, err := net.Listen("tcp", ":22")
    if err != nil {
        log.Fatalf("Failed to listen on 22: %v", err)
    }
    log.Println("SSH server started on port 22")

    // 处理SSH连接
    for {
        tcpConn, err := listener.Accept()
        if err != nil {
            log.Fatalf("Failed to accept SSH connection: %v", err)
        }
        go handleSSHConn(tcpConn, sshConfig)
    }
}

func handleSSHConn(tcpConn net.Conn, sshConfig *ssh.ServerConfig) {
    // 建立SSH连接
    sshConn, chans, reqs, err := ssh.NewServerConn(tcpConn, sshConfig)
    if err != nil {
        log.Fatalf("Failed to establish SSH connection: %v", err)
    }
    log.Printf("SSH connection from %v (%v)", sshConn.RemoteAddr(), sshConn.ClientVersion())

    // 处理SSH请求
    go ssh.DiscardRequests(reqs)

    // 处理SSH信道
    for newChannel := range chans {
        switch newChannel.ChannelType() {
        case "session":
            // 拒绝所有操作系统执行请求
            if strings.Contains(string(newChannel.ExtraData()), "exec") {
                newChannel.Reject(ssh.Prohibited, "Command execution not allowed")
                continue
            }
            // 拒绝所有sftp请求
            if strings.Contains(string(newChannel.ExtraData()), "sftp") {
                newChannel.Reject(ssh.Prohibited, "sftp not allowed")
                continue
            }
            // 拒绝所有代理转发请求
            if strings.Contains(string(newChannel.ExtraData()), "proxy") {
                newChannel.Reject(ssh.Prohibited, "Proxy forwarding not allowed")
                continue
            }
            // 拒绝所有x11转发请求
            if strings.Contains(string(newChannel.ExtraData()), "x11") {
                newChannel.Reject(ssh.Prohibited, "X11 forwarding not allowed")
                continue
            }
            // 接受所有shell请求
            channel, requests, err := newChannel.Accept()
            if err != nil {
                log.Fatalf("Failed to accept shell channel: %v", err)
            }
            log.Println("Shell channel opened")
            go handleShellChannel(channel, requests)
        case "direct-tcpip":
            // 允许服务器60000端口转发到本地10000端口
            channel, _, err := newChannel.Accept()
            if err != nil {
                log.Fatalf("Failed to accept direct-tcpip channel: %v", err)
            }
            log.Println("Direct-tcpip channel opened")
            go handleDirectTcpipChannel(channel)
        default:
            newChannel.Reject(ssh.UnknownChannelType, "Unknown channel type")
        }
    }
}

func handleShellChannel(channel ssh.Channel, requests <-chan *ssh.Request) {
    defer channel.Close()

    // 执行shell命令
    cmd := exec.Command("/bin/sh", "-i")
    cmd.Stdin = channel
    cmd.Stdout = channel
    cmd.Stderr = channel
    err := cmd.Start()
    if err != nil {
        log.Fatalf("Failed to start shell: %v", err)
    }
    err = cmd.Wait()
    if err != nil {
        log.Fatalf("Failed to wait for shell: %v", err)
    }
}

func handleDirectTcpipChannel(channel ssh.Channel) {
    defer channel.Close()

    // 转发服务器60000端口到本地10000端口
    localConn, err := net.Dial("tcp", "localhost:10000")
    if err != nil {
        log.Fatalf("Failed to dial local port: %v", err)
    }
    go io.Copy(channel, localConn)
    go io.Copy(localConn, channel)
}