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Paramiko Connect via proxy
#!/usr/bin/env python
#-*- coding:utf8 -*-
# sources
# 1.
# 2.
# info:
# local -> proxy-server -> dest-server
# ~/.ssh/config
# Host proxy-server
# User hoge
# HostName
# IdentityFile ~/.ssh/id_rsa_proxy
# Host dest-server
# User fuga
# HostName
# IdentityFile ~/.ssh/id_rsa_dest
# ProxyCommand ssh proxy-server nc %h %p
import os
import sys
import paramiko
def test_client(host_name):
conf = paramiko.SSHConfig()
host = conf.lookup(host_name)
client = paramiko.SSHClient()
host['hostname'], username=host['user'],
# if you have a key file
# key_filename=host['identityfile'],
stdin, stdout, stderr = client.exec_command('command to run on dest-host')
if __name__ == '__main__':
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Any help is appreciated here.

Try this @JaldhiPandya:
ProxyCommand ssh -q -W %h:%p proxy-server

one more thing, here I needed to set the port in my "dest-server".

Hope this helps you

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What argument do we need to give in expanduser() in the code?

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I can't get ssh working through a bastion: I always get the error paramiko.ssh_exception.SSHException: Error reading SSH protocol banner.
Did some of you encountered the same issue ?

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hqqns commented May 20, 2021

Ty Ty Ty

Live saver!

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Any ideas on passing CertificateFile and identityfile in the proxy commands?
This is what the working ssh config looks like

TCPKeepAlive yes
ServerAliveCountMax 20
ServerAliveInterval 15

Host <vm name>
    Hostname <vm ip>
    IdentityFile /c/Users/<my ntid>/.ssh/autobahn_rsa
    CertificateFile /c/Users/<my ntid>/.ssh/
    ProxyCommand ssh -qx -i /c/Users/<my ntid>/.ssh/autobahn_rsa -o "CertificateFile /c/Users/<my ntid>/.ssh/" -o "TCPKeepAlive yes" -o "ServerAliveCountMax 20" -o "ServerAliveInterval 15" <proxy user>@<proxy host> -W %h:%p

I use this from git bash with a command like this ssh my_ntid@vm_host

I tried the above but getting

Traceback (most recent call last):
  File "C:\Users\sfager001\AppData\Local\Programs\Python\Python39\lib\site-packages\paramiko\", line 107, in recv
    r, w, x = select([self.process.stdout], [], [], select_timeout)
OSError: [WinError 10038] An operation was attempted on something that is not a socket

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I don't know how this works, but it worked for me for access a host via a jumphost. I tried the proxycommand and got "paramiko.ssh_exception.SSHException: Error reading SSH protocol banner" error,

This just works...ask long as the workstation has propert ssh config file!

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