Nested SSH using Python Paramiko and pysftp

nested_ssh_paramiko_pysftp.py

import pysftp
import paramiko

# SSH jump server details
jump_server_host = '<host>'
jump_server_username = '<user>'
jump_server_password = '<password>'

# SFTP server details
sftp_server_host = '<host>'
sftp_server_username = '<user>'
sftp_server_password = '<password>'

cnopts = pysftp.CnOpts()
cnopts.hostkeys = None

jump_server = pysftp.Connection(cnopts=cnopts,
                                host=jump_server_host,
                                username=jump_server_username,
                                password=jump_server_password,
                                port=22)

jump_sftp_client = jump_server.sftp_client

transport = jump_sftp_client.get_channel().get_transport()
dest_addr = (sftp_server_host, 22)
local_addr = ('localhost', 0)
channel = transport.open_channel("direct-tcpip", dest_addr, local_addr)

sftp = paramiko.SSHClient()
sftp.set_missing_host_key_policy(paramiko.AutoAddPolicy())
sftp.connect(sftp_server_host, username=sftp_server_username, password=sftp_server_password, sock=channel)

sftp_client = sftp.open_sftp()

files = sftp_client.listdir('.')

for file in files:
    print(file)

sftp.close()
jump_server.close()