python telnet登陆

　　源码请参考：starnightcyber/scripts。

　　主要使用TelnetClient类，封装了登录和执行命令的基本操作。

　　源码如下，或请查看：scripts/telnet/telnet.py

#!/usr/bin/env python
# -*- coding:utf-8 -*-

import logging
import telnetlib
import time


# telnet登录认证相关
auth = {
  "user_prompt": b'Username:',            # 输入用户名提示
  "password_prompt": b'Password:',        # 输入密码提示
  "enter": b'
',                        # 回车
  "remote_enter": b'

',
}


class TelnetClient(object):
    def __init__(self):
        self.tn = telnetlib.Telnet()        # Telnet client

    def login(self, ip, port, tel_dict):
        """
        telnet 登录
        :param ip: 目标ip
        :param port: 目标端口
        :param tel_dict: 密码字典
        :return: 登录成功(True) or 登录失败(False)
        """
        msg = 'trying to login {}:{} telnet service'.format(ip, port)
        print(msg)

        # telnet登录
        for username, password in tel_dict.items():

            # 创建一个telnet连接
            try:
                self.tn.open(ip, port)
            except:
                logging.warning('%s网络连接失败' % ip)
                return False, ''

            msg = 'try user:[{}], password:[{}]'.format(username, password)
            print(msg)

            # 登录尝试
            try:
                # 等待输入用户名提示user_prompt出现后，输入用户名
                self.tn.read_until(auth['user_prompt'], timeout=3)
                self.tn.write(username.encode('ascii') + auth['enter'])

                # 等待输入密码提示password_prompt出现后，输入密码
                self.tn.read_until(auth['password_prompt'], timeout=3)
                self.tn.write(password.encode('ascii') + auth['enter'])

                # 延时两秒再收取返回结果，给服务端足够响应时间
                time.sleep(2)

                # 获取登录结果, read_very_eager()获取到的是的是上次获取之后本次获取之前的所有输出
                command_result = self.tn.read_very_eager().decode('ascii')
                # print('===>', command_result)
                prompt, _ = command_result.split('->')
                # print('===>', prompt.strip())

                # 如果返回的结果中没有提示输入用户名，表示登录成功
                if auth['user_prompt'] not in command_result.encode('ascii'):
                    print('登录成功')
                    return True
                else:
                    continue
            except:
                pass
        return False

    def execute_command(self, command):
        """
        执行一些命令
        :param command: 要执行的命令
        :return: None
        """
        try:
            self.tn.write(command.encode('ascii') + auth['enter'])
            time.sleep(2)
            # 获取命令结果
            command_result = self.tn.read_very_eager().decode('ascii')
            print('==>', command_result)
        except:
            print('something went wrong...')
            pass

    # 退出telnet，保留
    def logout_host(self):
        self.tn.write(b"bye
")

if __name__ == '__main__':

    # 参数
    ip = '172.16.176.120'
    port = '2570'
    tel_dict = {'admin': 'admin', 'aaa': 'bbb', '': ''}

    # 登陆
    tn = TelnetClient()
    tn.login(ip, port, tel_dict)

    # 执行命令
    command = 'ver'
    tn.execute_command(command)

    # 退出
    tn.logout_host()

　　执行输出如下：

# python3 telnet_brute.py
trying to login 172.16.176.120:2570 telnet service
try user:[admin], password:[admin]
try user:[aaa], password:[bbb]
try user:[], password:[]
登录成功
==> ver
 Version :PAS_SIPPROXY_6.0.0.3.0.190831, Compile Time: 16:18:41, Feb 25 2020
Return value: 1
SipPrxoy->

　　以上！