我试图通过我的Go程序中的SSH package运行脚本(到目前为止,我已经取得了成功)。
我的问题是,如果用户具有sudo权限,脚本会尝试使用sudo运行命令,这会导致bash脚本暂停,直到用户输入密码为止。
例如:
[ERROR ] Install cs-server: Checking dependencies: missing: lib32gcc1
# It attempts to install the missing dependencies with sudo but pauses here
[sudo] password for guest:
在我的Go程序中,我写了一些与此类似的内容:
// Connect to SSH and retreive session...
out, err := session.StdoutPipe()
if err != nil {
log.Fatal(err)
}
go func(out io.Reader) {
r := bufio.NewScanner(out)
for r.Scan() {
fmt.Println(r.Text())
}
}(out)
// Execute ssh command...
我收到与上面示例完全相同的输出,仅在这种情况下,我甚至看不到行[sudo] password for guest:
...它只打印到[ERROR ] Install cs-server: Checking dependencies: missing: lib32gcc1
并暂停永远。
如何绕过此暂停?我的选择是自动从我的Go程序输入密码,或者结束ssh执行并只接收输出。
答案 0 :(得分:4)
我设法通过使用session.StdoutPipe()
和session.StdinPipe()
来解决此问题。我编写了一个go例程,它扫描每个字节并检查最后写入的行是以"[sudo] password for "
开头还是以": "
结尾。它会将password + "\n"
写入继续执行脚本的session.StdinPipe()
。
以下是我所拥有的所有代码。
package ssh
import (
"bufio"
"io"
"log"
"net"
"strings"
"golang.org/x/crypto/ssh"
)
type Connection struct {
*ssh.Client
password string
}
func Connect(addr, user, password string) (*Connection, error) {
sshConfig := &ssh.ClientConfig{
User: user,
Auth: []ssh.AuthMethod{
ssh.Password(password),
},
HostKeyCallback: ssh.HostKeyCallback(func(hostname string, remote net.Addr, key ssh.PublicKey) error { return nil }),
}
conn, err := ssh.Dial("tcp", addr, sshConfig)
if err != nil {
return nil, err
}
return &Connection{conn, password}, nil
}
func (conn *Connection) SendCommands(cmds ...string) ([]byte, error) {
session, err := conn.NewSession()
if err != nil {
log.Fatal(err)
}
defer session.Close()
modes := ssh.TerminalModes{
ssh.ECHO: 0, // disable echoing
ssh.TTY_OP_ISPEED: 14400, // input speed = 14.4kbaud
ssh.TTY_OP_OSPEED: 14400, // output speed = 14.4kbaud
}
err = session.RequestPty("xterm", 80, 40, modes)
if err != nil {
return []byte{}, err
}
in, err := session.StdinPipe()
if err != nil {
log.Fatal(err)
}
out, err := session.StdoutPipe()
if err != nil {
log.Fatal(err)
}
var output []byte
go func(in io.WriteCloser, out io.Reader, output *[]byte) {
var (
line string
r = bufio.NewReader(out)
)
for {
b, err := r.ReadByte()
if err != nil {
break
}
*output = append(*output, b)
if b == byte('\n') {
line = ""
continue
}
line += string(b)
if strings.HasPrefix(line, "[sudo] password for ") && strings.HasSuffix(line, ": ") {
_, err = in.Write([]byte(conn.password + "\n"))
if err != nil {
break
}
}
}
}(in, out, &output)
cmd := strings.Join(cmds, "; ")
_, err = session.Output(cmd)
if err != nil {
return []byte{}, err
}
return output, nil
}
以及如何使用它的示例。
// ssh refers to the custom package above
conn, err := ssh.Connect("0.0.0.0:22", "username", "password")
if err != nil {
log.Fatal(err)
}
output, err := conn.SendCommands("sleep 2", "echo Hello!")
if err != nil {
log.Fatal(err)
}
fmt.Println(string(output))
答案 1 :(得分:2)
这是一个问题,无法使用@acidic的代码完全捕获输出流。 更新的代码如下
package main
import (
"bytes"
"fmt"
"io"
"log"
"net"
"strings"
"golang.org/x/crypto/ssh"
)
type Connection struct {
*ssh.Client
password string
}
func Connect(addr, user, password string) (*Connection, error) {
sshConfig := &ssh.ClientConfig{
User: user,
Auth: []ssh.AuthMethod{
ssh.Password(password),
},
HostKeyCallback: ssh.HostKeyCallback(func(hostname string, remote net.Addr, key ssh.PublicKey) error { return nil }),
}
conn, err := ssh.Dial("tcp", addr, sshConfig)
if err != nil {
return nil, err
}
return &Connection{conn, password}, nil
}
func (conn *Connection) SendCommands(cmds string) ([]byte, error) {
session, err := conn.NewSession()
if err != nil {
log.Fatal(err)
}
defer session.Close()
modes := ssh.TerminalModes{
ssh.ECHO: 0, // disable echoing
ssh.TTY_OP_ISPEED: 14400, // input speed = 14.4kbaud
ssh.TTY_OP_OSPEED: 14400, // output speed = 14.4kbaud
}
err = session.RequestPty("xterm", 80, 40, modes)
if err != nil {
return []byte{}, err
}
stdoutB := new(bytes.Buffer)
session.Stdout = stdoutB
in, _ := session.StdinPipe()
go func(in io.Writer, output *bytes.Buffer) {
for {
if strings.Contains(string(output.Bytes()), "[sudo] password for ") {
_, err = in.Write([]byte(conn.password + "\n"))
if err != nil {
break
}
fmt.Println("put the password --- end .")
break
}
}
}(in, stdoutB)
err = session.Run(cmds)
if err != nil {
return []byte{}, err
}
return stdoutB.Bytes(), nil
}
func main() {
// ssh refers to the custom package above
conn, err := Connect("0.0.0.0:22", "username", "password")
if err != nil {
log.Fatal(err)
}
output, err := conn.SendCommands("sudo docker ps")
if err != nil {
log.Fatal(err)
}
fmt.Println(string(output))
}
答案 2 :(得分:0)
一种解决方法是将sudo [cmd]
转换为echo [password] | sudo -S [cmd]
,这不好,但是为我工作。