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Paramiko Connect via proxy
#!/usr/bin/env python
#-*- coding:utf8 -*-
# sources
# 1. https://gist.github.com/tell-k/4943359#file-paramiko_proxycommand_sample-py-L11
# 2. https://github.com/paramiko/paramiko/pull/97
# info: http://bitprophet.org/blog/2012/11/05/gateway-solutions/
# local -> proxy-server -> dest-server
# ~/.ssh/config
#
# Host proxy-server
# User hoge
# HostName proxy.example.com
# IdentityFile ~/.ssh/id_rsa_proxy
#
# Host dest-server
# User fuga
# HostName proxy.example.com
# 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()
conf.parse(open(os.path.expanduser('~/.ssh/config')))
host = conf.lookup(host_name)
client = paramiko.SSHClient()
client.load_system_host_keys()
client.set_missing_host_key_policy(paramiko.AutoAddPolicy())
client.connect(
host['hostname'], username=host['user'],
# if you have a key file
# key_filename=host['identityfile'],
password='yourpassword',
sock=paramiko.ProxyCommand(host.get('proxycommand'))
)
stdin, stdout, stderr = client.exec_command('command to run on dest-host')
print stdout.read()
if __name__ == '__main__':
test_client(sys.argv[1])
@dasayan05
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dasayan05 commented May 9, 2018

This helped me a lot !! Thanks.

@sreekaanth
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sreekaanth commented Sep 4, 2019

Where is host_name in the ssh config file?

How does it pickup host name from the config file is it that host_name is like a keyword for parsing the config file?

@JaldhiPandya
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JaldhiPandya commented Mar 18, 2020

Getting error with this code -
paramiko.ssh_exception.ProxyCommandFailure: ProxyCommand("") returned nonzero exit status: Broken pipe

How to solve the above error?

@JaldhiPandya
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JaldhiPandya commented Mar 18, 2020

Any help is appreciated here.

@andrejesusdasilva
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andrejesusdasilva commented May 15, 2020

Any help is appreciated here.

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

@andrejesusdasilva
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andrejesusdasilva commented May 15, 2020

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

@nikita01021998
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nikita01021998 commented Aug 26, 2020

What argument do we need to give in expanduser() in the paramiko-proxy.py code?

@GaetanLepage
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GaetanLepage commented Apr 22, 2021

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 ?

@hqqns
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hqqns commented May 20, 2021

Ty Ty Ty

Live saver!

@Runekeon
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Runekeon commented Jul 24, 2021

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/autobahn_rsa-cert.pub
    ProxyCommand ssh -qx -i /c/Users/<my ntid>/.ssh/autobahn_rsa -o "CertificateFile /c/Users/<my ntid>/.ssh/autobahn_rsa-cert.pub" -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\proxy.py", 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

@majorgear
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majorgear commented Oct 14, 2022

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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