怎么通过堡垒机连接服务器

import paramiko

# 堡垒机配置
jump_host = 'bastion.example.com'
jump_port = 22
jump_user = 'bastion_user'
jump_password = 'bastion_password'

# 目标服务器配置
target_host = 'target_server.example.com'
target_port = 22
target_user = 'target_user'
target_password = 'target_password'

# 创建SSH客户端
ssh_client = paramiko.SSHClient()
ssh_client.set_missing_host_key_policy(paramiko.AutoAddPolicy())

# 连接堡垒机
ssh_client.connect(hostname=jump_host, port=jump_port, username=jump_user, password=jump_password)

# 创建通道
transport = ssh_client.get_transport()
dest_addr = (target_host, target_port)
local_addr = ('localhost', 22)

# 通过堡垒机连接到目标服务器
channel = transport.open_channel("direct-tcpip", dest_addr, local_addr)

# 创建新的SSH客户端连接目标服务器
target_ssh_client = paramiko.SSHClient()
target_ssh_client.set_missing_host_key_policy(paramiko.AutoAddPolicy())
target_ssh_client.connect(hostname=target_host, port=target_port, username=target_user, password=target_password, sock=channel)

# 执行命令
stdin, stdout, stderr = target_ssh_client.exec_command('ls -l')
print(stdout.read().decode())

# 关闭连接
target_ssh_client.close()
ssh_client.close()