python - 使用Paramiko实现跳转主机(端口转发)时涉及的主机/IP地址和端口的说明

Question

我正在尝试与Paramiko设置跳转主机连接。

这是~/.ssh/config中的设置

Host jump.csail.mit.edu
  GSSAPIAuthentication yes
  GSSAPIKeyExchange yes
  VerifyHostKeyDNS yes
Host *.csail.mit.edu !jump.csail.mit.edu 128.52.* 128.30.* 128.31.*
  ProxyCommand ssh -W %h:%p jump.csail.mit.edu
  GSSAPIAuthentication yes
  GSSAPIDelegateCredentials yes
  GSSAPIKeyExchange yes

如果我从终端连接，它就可以工作。

我还找到了用于Paramiko跳转主机连接的this code，我想知道应该根据上述ssh配置设置来设置jumpbox_public_addr和jumpbox_private_addr吗？

import os
import paramiko

ssh_key_filename = os.getenv('HOME') + '/.ssh/id_rsa'

jumpbox_public_addr = '168.128.52.199'
jumpbox_private_addr = '10.0.5.10'
target_addr = '10.0.5.20'

jumpbox=paramiko.SSHClient()
jumpbox.set_missing_host_key_policy(paramiko.AutoAddPolicy())
jumpbox.connect(jumpbox_public_addr, username='root', key_filename=ssh_key_filename)

jumpbox_transport = jumpbox.get_transport()
src_addr = (jumpbox_private_addr, 22)
dest_addr = (target_addr, 22)
jumpbox_channel = jumpbox_transport.open_channel("direct-tcpip", dest_addr, src_addr)

target=paramiko.SSHClient()
target.set_missing_host_key_policy(paramiko.AutoAddPolicy())
target.connect(target_addr, username='root', key_filename=ssh_key_filename, sock=jumpbox_channel)

stdin, stdout, stderr = target.exec_command("ifconfig")
for line in stdout.read().split(b'\n'):
  print(str(line))

target.close()
jumpbox.close()

谢谢!

Answer 1

jumpbox_public_addr是跳转服务器的地址，应该是jump.csail.mit.edu。
jumpbox_private_addr( src_addr 的Transport.open_channel参数)是从jump.csail.mit.edu到目标服务器的连接的源地址。通常，您无需担心(因为您无需考虑大多数TCP连接的源地址和端口)。并且它绝对不应该是端口22。以下应该告诉服务器使用默认值:

src_addr = ("0.0.0.0", 0)