SSH via jump-hosts using Paramiko

ssh_jump.py

#!/usr/bin/env python3

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()

I have the same problem with a Nokia OLT and ZTE LTE I do not know what happened this is my logging
DEBUG:invoke:Collection-driven: {}
DEBUG:invoke:System-wide config file has not been loaded yet, skipping
DEBUG:invoke:Per-user config file (C:\Users\Erik/.fabric.py): {}
DEBUG:invoke:Per-project config file has not been loaded yet, skipping
DEBUG:invoke:Environment variable config: {}
DEBUG:invoke:Runtime config file has not been loaded yet, skipping
DEBUG:invoke:Overrides: {}
DEBUG:invoke:Modifications: {'inline_ssh_env': True}
DEBUG:invoke:Deletions: {}
DEBUG:paramiko.transport:[chan 5] Max packet in: 32768 bytes
DEBUG:paramiko.transport:[chan 5] Max packet out: 32768 bytes
DEBUG:paramiko.transport:Secsh channel 5 opened.
DEBUG:paramiko.transport:starting thread (client mode): 0x3ff0c9a0
DEBUG:paramiko.transport:Local version/idstring: SSH-2.0-paramiko_3.0.0
DEBUG:paramiko.transport:Remote version/idstring: SSH-2.0-IPSSH-1.12.0
INFO:paramiko.transport:Connected (version 2.0, client IPSSH-1.12.0)
DEBUG:paramiko.transport:=== Key exchange possibilities ===
DEBUG:paramiko.transport:kex algos: ecdh-sha2-nistp256, diffie-hellman-group14-sha1, diffie-hellman-group1-sha1
DEBUG:paramiko.transport:server key: ssh-rsa
DEBUG:paramiko.transport:client encrypt: aes128-ctr, aes192-ctr, aes256-ctr, aes128-cbc, aes192-cbc, aes256-cbc, 3des-cbc, cast128-cbc, blowfish-cbc, arcfour, des-cbc
DEBUG:paramiko.transport:server encrypt: aes128-ctr, aes192-ctr, aes256-ctr, aes128-cbc, aes192-cbc, aes256-cbc, 3des-cbc, cast128-cbc, blowfish-cbc, arcfour, des-cbc
DEBUG:paramiko.transport:client mac: hmac-sha2-256, hmac-sha2-512, hmac-sha1-96, hmac-sha1, hmac-md5-96, hmac-md5
DEBUG:paramiko.transport:server mac: hmac-sha2-256, hmac-sha2-512, hmac-sha1-96, hmac-sha1, hmac-md5-96, hmac-md5
DEBUG:paramiko.transport:client compress: none
DEBUG:paramiko.transport:server compress: none
DEBUG:paramiko.transport:client lang:
DEBUG:paramiko.transport:server lang:
DEBUG:paramiko.transport:kex follows: False
DEBUG:paramiko.transport:=== Key exchange agreements ===
DEBUG:paramiko.transport:Kex: ecdh-sha2-nistp256
DEBUG:paramiko.transport:HostKey: ssh-rsa
DEBUG:paramiko.transport:Cipher: aes128-ctr
DEBUG:paramiko.transport:MAC: hmac-sha2-256
DEBUG:paramiko.transport:Compression: none
DEBUG:paramiko.transport:=== End of kex handshake ===
DEBUG:paramiko.transport:kex engine KexNistp256 specified hash_algo
DEBUG:paramiko.transport:Switch to new keys ...
DEBUG:paramiko.transport:Adding ssh-rsa host key for 172.30.61.25: b'8851ea3fddfa8ad6e2b0b202d7234016'
DEBUG:paramiko.transport:userauth is OK
INFO:paramiko.transport:Auth banner: b'NOKIA iSAM 7360FX NAC-BOY.CHIQUIN2-B1-7360\n\n'
INFO:paramiko.transport:Authentication (password) successful!
DEBUG:paramiko.transport:[chan 0] Max packet in: 32768 bytes
DEBUG:paramiko.transport:[chan 0] Max packet out: 4096 bytes
DEBUG:paramiko.transport:Secsh channel 0 opened.
DEBUG:paramiko.transport:[chan 0] Sesch channel 0 request ok
DEBUG:paramiko.transport:[chan 0] EOF sent (0)
Error al ejecutar comando en equipo 172.30.61.25: Channel closed.
(False, 'Error al ejecutar comando en equipo 172.30.61.25: Channel closed.', '172.30.61.25')
DEBUG:paramiko.transport:EOF in transport thread
DEBUG:paramiko.transport:[chan 5] EOF sent (5)
DEBUG:paramiko.transport:Dropping user packet because connection is dead.
DEBUG:paramiko.transport:EOF in transport thread
DEBUG:paramiko.transport:Dropping user packet because connection is dead.

When I tried to run multiple commands, the ssh session close at the second command:

I only add this code:

   command_list = ["show ver", "show run"]
    for command in command_list:
        stdin, stdout, stderr = target.exec_command(command)
       
        for line in stdout.read().split(b'\n'):
            print(str(line))

I got the error:
raise SSHException("SSH session not active")
paramiko.ssh_exception.SSHException: SSH session not active

Any ideas guys?

I am trying jumpssh library:
https://pypi.org/project/jumpssh/

Thank you for your response : )

Is it possible to do the jump host without authentication on the first host?