如何使用socks代理连接远程ssh服务器？

Question

package main

import (
    "errors"
    "fmt"
    "net"

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

var (
    socks    string = "127.0.0.1:8000"
    server   string = "192.168.1.1:2222"
    cmd      string = ""
    login    string = "root"
    password string = ""
)

func main() {
    c, err := netConn(socks)
    if err != nil {
        fmt.Println(err)
    }
    conf := &ssh.ClientConfig{
        User: login,
        Auth: []ssh.AuthMethod{
            ssh.Password(password),
        },
    }
    client, err := Dialer(conf, c, server)
    if err != nil {
        fmt.Println(err)
    }
    session, err := client.NewSession()
    defer session.Close()
    if err != nil {
        fmt.Println(err)
    }
    session.Run(cmd)
}

func netConn(addr string) (net.Conn, error) {
    conn, err := net.Dial("tcp", addr)
    if err != nil {
        return nil, errors.New(fmt.Sprintf("Unable to connect to %v", err))
    }
    return conn, nil
}

func Dialer(conf *ssh.ClientConfig, c net.Conn, host string) (*ssh.Client, error) {
    conn, chans, reqs, err := ssh.NewClientConn(c, host, conf)
    if err != nil {
        return nil, err
    }
    return ssh.NewClient(conn, chans, reqs), nil
}

客户恐慌

ssh:握手失败：EOF

恐慌：运行时错误：无效的内存地址或空指针解引用

[信号0xbhtml" target="_blank">代码=0x1地址=0x0 pc=0x80f3e2d]

Goroutine 1[跑步]：

恐慌（0x8201b60,0x18522030）

/usr/lib/go/src/runtime/panic。go:464 0x326

戈朗。org/x/crypto/ssh。（*客户）。新闻会话（0x0、0x1、0x0、0x0）

/home/user/go/src/golang。org/x/crypto/ssh/client。go:129 0xcd

main.main（）

/home/user/go/src/ss/i.go:34 0x276

和日志中的socks服务器

[ERR]袜子：不支持的袜子版本：[83]

我怎样才能使它成为可能？谢谢

Answer 1

从ssh包API中可以看到，函数

func Dial(network, addr string, config *ClientConfig) (*Client, error)

直接返回ssh类型的对象。客户因此，您可以通过以下方法大大缩短代码：

func main() {
    conf := &ssh.ClientConfig{
            User: login,
            Auth: []ssh.AuthMethod{
                    ssh.Password(password),
            },
    }
    client, err := ssh.Dial("tcp", server, conf)
    if err != nil {
            fmt.Println(err)
    }
    defer client.Close()

    session, err := client.NewSession()
    defer session.Close()
    if err != nil {
            fmt.Println(err)
    }
    session.Run(cmd)
}

希望这有帮助！

Answer 2

您可以使用x/net/proxy包，如下所示：

package main

import (
    "log"

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

func main() {

    sshConfig := &ssh.ClientConfig{
        User: "user",
        // Auth: .... fill out with keys etc as normal
    }

    client, err := proxiedSSHClient("127.0.0.1:8000", "127.0.0.1:22", sshConfig)
    if err != nil {
        log.Fatal(err)
    }

    // get a session etc...
}

func proxiedSSHClient(proxyAddress, sshServerAddress string, sshConfig *ssh.ClientConfig) (*ssh.Client, error) {
    dialer, err := proxy.SOCKS5("tcp", proxyAddress, nil, proxy.Direct)
    if err != nil {
        return nil, err
    }

    conn, err := dialer.Dial("tcp", sshServerAddress)
    if err != nil {
        return nil, err
    }

    c, chans, reqs, err := ssh.NewClientConn(conn, sshServerAddress, sshConfig)
    if err != nil {
        return nil, err
    }

    return ssh.NewClient(c, chans, reqs), nil
}