Nested SSH using Python Paramiko

nested_ssh.py

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>'

jump_ssh = paramiko.SSHClient()
jump_ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
jump_ssh.connect(jump_server_host, username=jump_server_username, password=jump_server_password)

transport = jump_ssh.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_conn=sftp.get_transport().open_session()

sftp_client = sftp.open_sftp()

files = sftp_client.listdir('.')

for file in files:
    print(file)

sftp.close()
jump_ssh.close()