python-3.x - 使用 Paramiko 的基本 SSH 连接失败

Question

我正在学习 paramiko 的基础知识，为此我建立了一个基本实验室，在其中将 Ubuntu VM 连接到 EVE-ng 中模拟的路由器。
第一步是通过 ssh-Keygen 在客户端生成 key 对
接下来，我使用以下命令将公钥加载到远程服务器(Cisco 路由器):

ip ssh pubkey-chain
  username administrator
   key-hash ssh-rsa 97D0E9B5630D05D78EA9531053124BFF

之后，我就可以从 Ubuntu VM 登录到 Cisco 路由器:

$ ssh administrator@192.168.1.1
7206_1.rt#

然后，我从同一个客户端启动了一个 Python shell session 并尝试使用 Paramiko 建立一个 SSH session :

import paramiko
ssh = paramiko.SSHClient()
ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
ssh.connect('192.168.1.1', username='administrator', password='password', key_filename= '/home/administrator/.ssh/id_rsa.pub') 

但是这次我得到了以下异常:

Exception: Illegal info request from server
Traceback (most recent call last):
  File "/usr/local/lib/python3.8/dist-packages/paramiko/transport.py", line 2109, in run
    handler(self.auth_handler, m)
  File "/usr/local/lib/python3.8/dist-packages/paramiko/auth_handler.py", line 661, in _parse_userauth_info_request
    raise SSHException("Illegal info request from server")
paramiko.ssh_exception.SSHException: Illegal info request from server

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/local/lib/python3.8/dist-packages/paramiko/client.py", line 435, in connect
    self._auth(
  File "/usr/local/lib/python3.8/dist-packages/paramiko/client.py", line 764, in _auth
    raise saved_exception
  File "/usr/local/lib/python3.8/dist-packages/paramiko/client.py", line 751, in _auth
    self._transport.auth_password(username, password)
  File "/usr/local/lib/python3.8/dist-packages/paramiko/transport.py", line 1498, in auth_password
    raise SSHException("No existing session")
paramiko.ssh_exception.SSHException: No existing session

远程路由器 SSH 调试显示身份验证失败:

*Aug 16 01:18:07.295: SSH2 0: MAC compared for #5 :ok
*Aug 16 01:18:07.299: SSH2 0: input: padlength 16 bytes
*Aug 16 01:18:07.299: SSH2 0: Using method = publickey
*Aug 16 01:18:07.307: SSH2 0: send:packet of  length 432 (length also includes padlen of 4)
*Aug 16 01:18:07.307: SSH2 0: computed MAC for sequence no.#5 type 60
*Aug 16 01:18:07.311: SSH2 0: Authenticating 'administrator' with method: publickey
*Aug 16 01:18:07.327: SSH2 0: SSH ERROR closing the connection
*Aug 16 01:18:07.331: SSH2 0: send:packet of  length 80 (length also includes padlen of 15)
*Aug 16 01:18:07.331: SSH2 0: computed MAC for sequence no.#6 type 1
*Aug 16 01:18:07.335: SSH2 0: Pubkey Authentication failed for user administrator
*Aug 16 01:18:07.335: SSH0: password authentication failed for administrator

在这一点上，我无法判断问题出在服务器上还是在路由器上，因为在没有 Paramiko 的情况下直接从服务器连接到路由器时一切正常。
谢谢。

Answer 1

好的，看起来默认情况下，Paramiko 在 ~/.ssh/中搜索可发现的私钥文件，如果尝试连接到另一台服务器很好，但由于它试图连接到路由器，因此需要通过将 look_for_keys 设置为 False 来禁用此功能.这解决了我的问题(只要这不是生产环境)。