通过 Python paramiko 建立 SSH 隧道

【问题标题】：SSH Tunnel through Python paramiko通过 Python paramiko 建立 SSH 隧道
【发布时间】：2023-04-02 14:13:01
【问题描述】：

为了访问远程主机，我们需要登录到 jumphost1 和 jumphost2。为此，我们正在尝试创建一个隧道，如下面的 python 脚本所示。

我这个连接的主要目的是执行一个脚本脚本并将输出重定向到脚本所在的同一位置
脚本位置是本地机器，pyc文件将从那里创建隧道并连接远程机器。

添加信息：两个 jumphost 都通过密码启用 sshkeygen。所以它会询问密码。

[root@centseven ~]# cat pyc
import paramiko
from sshtunnel import SSHTunnelForwarder

with SSHTunnelForwarder(
    ('1.5.18.1', 22),
    ssh_username='user',
    ssh_pkey="/root/.ssh/id_rsa",
    ssh_private_key_password="userpass",
    remote_bind_address=("1.15.18.1", 22),
    local_bind_address=('127.0.0.1', 1111)
) as tunnel:
    client = paramiko.SSHClient()
    client.load_system_host_keys()
    client.set_missing_host_key_policy(paramiko.AutoAddPolicy())
    client.connect(hostname=127.0.0.1, port=1111, username=root, password=remotepass)
    # do some operations with client session
    stdin, stdout, stderr = client.exec_command("./script >> output.txt")
    print stdout.channel.recv_exit_status()    # status is 0
    client.close()
print('FINISH!')

建议更改的当前错误，它现在要求我输入密码，输入密码时出现以下错误

       # python pyc
Enter passphrase for key '/root/.ssh/id_rsa':
2017-05-14 23:44:34,322| ERROR   | Secsh channel 0 open FAILED: open failed: Administratively prohibited
2017-05-14 23:44:34,337| ERROR   | Could not establish connection from ('127.0.0.1', 1111) to remote side of the tunnel
2017-05-14 23:44:34,338| ERROR   | Exception: Error reading SSH protocol banner
2017-05-14 23:44:34,339| ERROR   | Traceback (most recent call last):
2017-05-14 23:44:34,339| ERROR   |   File "/root/.pyenv/versions/ansible2/lib/python2.7/site-packages/paramiko/transport.py", line 1740, in run
2017-05-14 23:44:34,339| ERROR   |     self._check_banner()
2017-05-14 23:44:34,339| ERROR   |   File "/root/.pyenv/versions/ansible2/lib/python2.7/site-packages/paramiko/transport.py", line 1888, in _check_banner
2017-05-14 23:44:34,340| ERROR   |     raise SSHException('Error reading SSH protocol banner' + str(e))
2017-05-14 23:44:34,340| ERROR   | SSHException: Error reading SSH protocol banner
2017-05-14 23:44:34,340| ERROR   |
Traceback (most recent call last):
  File "pyc", line 16, in <module>
    client.connect(hostname="127.0.0.1",port=1111,username="root",password="nasadmin")
  File "/root/.pyenv/versions/ansible2/lib/python2.7/site-packages/paramiko/client.py", line 338, in connect
    t.start_client()
  File "/root/.pyenv/versions/ansible2/lib/python2.7/site-packages/paramiko/transport.py", line 493, in start_client
    raise e
paramiko.ssh_exception.SSHException: Error reading SSH protocol banner

编辑1

python stack.py
Enter passphrase for key '/root/.ssh/id_rsa': 2017-05-15 00:14:24,437| ERROR   | Exception: Error reading SSH protocol banner
2017-05-15 00:14:24,439| ERROR   | Traceback (most recent call last):
2017-05-15 00:14:24,439| ERROR   |   File "/root/.pyenv/versions/ansible2/lib/python2.7/site-packages/paramiko/transport.py", line 1740, in run
2017-05-15 00:14:24,440| ERROR   |     self._check_banner()
2017-05-15 00:14:24,440| ERROR   |   File "/root/.pyenv/versions/ansible2/lib/python2.7/site-packages/paramiko/transport.py", line 1888, in _check_banner
2017-05-15 00:14:24,440| ERROR   |     raise SSHException('Error reading SSH protocol banner' + str(e))
2017-05-15 00:14:24,440| ERROR   | SSHException: Error reading SSH protocol banner
2017-05-15 00:14:24,440| ERROR   |

2017-05-15 00:14:24,442| ERROR   | Could not connect to gateway remotehost:22 : Error reading SSH protocol banner
Traceback (most recent call last):
  File "stack.py", line 9, in <module>
    remote_bind_address=("remotehost", 22)
  File "/root/.pyenv/versions/ansible2/lib/python2.7/site-packages/sshtunnel.py", line 1482, in __enter__
    self.start()
  File "/root/.pyenv/versions/ansible2/lib/python2.7/site-packages/sshtunnel.py", line 1224, in start
    reason='Could not establish session to SSH gateway')
  File "/root/.pyenv/versions/ansible2/lib/python2.7/site-packages/sshtunnel.py", line 1036, in _raise
    raise exception(reason)
sshtunnel.BaseSSHTunnelForwarderError: Could not establish session to SSH gateway

.ssh/config

## lo8
Host jump1-*
    User user
    IdentityFile ~/.ssh/id_rsa
    ForwardAgent yes
    ServerAliveInterval 60
    ServerAliveCountMax 12


Host jump01-temporary 
    Hostname HostIP
    Port 2222

    Host jump02
    Hostname HostIP
    Port 2222

Host jump01           
    Hostname HostIP
    Port 22
    ProxyCommand ssh -W %h:%p jump01
Host jump02           
    Hostname HostIP
    Port 22
    ProxyCommand ssh -W %h:%p jump02

Host Remote host 
    Hotname HostIP

有2个跳转服务器需要连接本地机器 --> JUMP1 --> Jump2 --> Remte Host

【问题讨论】：

NoValidConnectionsError 仅在 ECONNREFUSED, EHOSTUNREACH 时加注。检查centseven中的1111端口是否未被其他进程占用，或者被你的firewall阻塞。
从 set_missing_host_key_policy 中删除注释，ssh 客户端不知道这个地址。
@Fruch 已按建议更改，请参阅新编辑。它也要求我输入我们不想要的密码。
Sorry Mata 打错了 IP 不同。
@Poo 如果你有密码短语，它总是会要求它，你可以创建一个没有密码短语的密钥。