Go中的SSH：无法通过身份验证，尝试的方法[无]，没有支持的方法

As pointed by @JimB and @putu my server doesn't have Password Authentication enabled. To verify that i ran ssh with verbose option and it gave me back all supported authentication methods. In my case it turned out to be following:

debug1: Authentications that can continue: publickey,keyboard-interactive,hostbased

So i had 2 options to go with, either enable password authentication on the server or use other method to authenticate.

To enable password authentication connect to your server and open sshd config file like so:

vi/etc/ssh/sshd_config

Find line saying: PasswordAuthentication no

Change it to yes, save changes and restart sshd service: service ssh restart

After that password authentication method starts to work as expected. Alternatively other methods can be used, i decided to try keyboard-interactive, the one user usually has when connects over the terminal using ssh. Here is the code snippet that does just that, sends password after password question is asked by remote server:

package main

import (
    "bytes"
    "golang.org/x/crypto/ssh"
    "fmt"
)

func connectViaSsh(user, host string, password string) (*ssh.Client, *ssh.Session) {
    config := &ssh.ClientConfig{
        User: user,
        Auth: []ssh.AuthMethod{
            ssh.KeyboardInteractive(SshInteractive),
        },
        HostKeyCallback: ssh.InsecureIgnoreHostKey(),
    }

    client, err := ssh.Dial("tcp", host, config)
    fmt.Println(err)

    session, err := client.NewSession()
    fmt.Println(err)

    return client, session
}

func SshInteractive(user, instruction string, questions []string, echos []bool) (answers []string, err error) {
    answers = make([]string, len(questions))
    // The second parameter is unused
    for n, _ := range questions {
        answers[n] = "your_password"
    }

    return answers, nil
}

func main() {
    var b bytes.Buffer
    client, session := connectViaSsh("root", "host:22", "password")

    session.Stdout = &b
    session.Run("ls")
    fmt.Println(b.String())

    client.Close()
}

In my case server asks only one question which is password, if your server asks more than that you would need to build an entire chain of answers to feed back in.