I want to fake an SCP server with Paramiko. I have write the following code:
import base64
import time
from binascii import hexlify
import os
import socket
import sys
import threading
import traceback
import interactive
# from warnings import cls
import logging
logging.basicConfig(level='DEBUG')
import paramiko
from paramiko import SFTPClient
from paramiko.py3compat import b, u, decodebytes
dir_local='/tmp'
# setup logging
paramiko.util.log_to_file("demo_server.log")
host_key = paramiko.RSAKey(filename="test_rsa.key")
# host_key = paramiko.DSSKey(filename='test_dss.key')
print("Read key: " + u(hexlify(host_key.get_fingerprint())))
class Server(paramiko.ServerInterface):
# 'data' is the output of base64.b64encode(key)
# (using the "user_rsa_key" files)
data = (
b"AAAAB3NzaC1yc2EAAAABIwAAAIEAyO4it3fHlmGZWJaGrfeHOVY7RWO3P9M7hp"
b"fAu7jJ2d7eothvfeuoRFtJwhUmZDluRdFyhFY/hFAh76PJKGAusIqIQKlkJxMC"
b"KDqIexkgHAfID/6mqvmnSJf0b5W8v5h2pI/stOSwTQ+pxVhwJ9ctYDhRSlF0iT"
b"UWT10hcuO4Ks8="
)
good_pub_key = paramiko.RSAKey(data=decodebytes(data))
def __init__(self):
logging.info('__init__')
self.event = threading.Event()
def check_channel_request(self, kind, chanid):
logging.info('check_channel_request')
if kind == "session":
return paramiko.OPEN_SUCCEEDED
return paramiko.OPEN_FAILED_ADMINISTRATIVELY_PROHIBITED
def check_auth_password(self, username, password):
logging.info('check_auth_password')
# Here you can add couple user/password
if (username == "root") and (password == "password"):
return paramiko.AUTH_SUCCESSFUL
return paramiko.AUTH_FAILED
def check_auth_publickey(self, username, key):
logging.info('check_auth_publickey')
print("Auth attempt with key: " + u(hexlify(key.get_fingerprint())))
if (username == "micki") and (key == self.good_pub_key):
return paramiko.AUTH_SUCCESSFUL
return paramiko.AUTH_FAILED
def check_auth_gssapi_with_mic(
self, username, gss_authenticated=paramiko.AUTH_FAILED, cc_file=None
):
logging.info('check_auth_gssapi_with_mic')
"""
.. note::
We are just checking in `AuthHandler` that the given user is a
valid krb5 principal! We don't check if the krb5 principal is
allowed to log in on the server, because there is no way to do that
in python. So if you develop your own SSH server with paramiko for
a certain platform like Linux, you should call ``krb5_kuserok()`` in
your local kerberos library to make sure that the krb5_principal
has an account on the server and is allowed to log in as a user.
.. seealso::
`krb5_kuserok() man page
<http://www.unix.com/man-page/all/3/krb5_kuserok/>`_
"""
if gss_authenticated == paramiko.AUTH_SUCCESSFUL:
return paramiko.AUTH_SUCCESSFUL
return paramiko.AUTH_FAILED
def check_auth_gssapi_keyex(
self, username, gss_authenticated=paramiko.AUTH_FAILED, cc_file=None
):
logging.info('check_auth_gssapi_keyex')
if gss_authenticated == paramiko.AUTH_SUCCESSFUL:
return paramiko.AUTH_SUCCESSFUL
return paramiko.AUTH_FAILED
def enable_auth_gssapi(self):
logging.info('enable_auth_gssapi')
return True
def get_allowed_auths(self, username):
logging.info('get_allowed_auths')
return "gssapi-keyex,gssapi-with-mic,password,publickey"
def check_channel_shell_request(self, channel):
logging.info('check_channel_shell_request')
self.event.set()
return True
def check_channel_pty_request(
self, channel, term, width, height, pixelwidth, pixelheight, modes
):
logging.info('check_channel_pty_request')
return True
DoGSSAPIKeyExchange = True
# now connect
try:
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
sock.bind(("192.168.34.10", 22))
except Exception as e:
print("*** Bind failed: " + str(e))
traceback.print_exc()
sys.exit(1)
try:
sock.listen(100)
print("Listening for connection ...")
client, addr = sock.accept()
except Exception as e:
print("*** Listen/accept failed: " + str(e))
traceback.print_exc()
sys.exit(1)
print("Got a connection!")
try:
t = paramiko.Transport(client, gss_kex=DoGSSAPIKeyExchange)
t.set_gss_host(socket.getfqdn(""))
try:
t.load_server_moduli()
except:
print("(Failed to load moduli -- gex will be unsupported.)")
raise
t.add_server_key(host_key)
server = Server()
try:
t.start_server(server=server)
except paramiko.SSHException:
print("*** SSH negotiation failed.")
sys.exit(1)
# wait for auth
chan = t.accept(20)
if chan is None:
print("*** No channel.")
sys.exit(1)
print("Authenticated!")
transport = paramiko.Transport(sock=("192.168.34.10", 22))
transport.connect(username="root", password="password")
interactive.interactive_shell(chan)
server.event.wait(450)
if not server.event.is_set():
print("*** Client never asked for a shell.")
sys.exit(1)
chan.send("Success Connect\r\n\r\n")
f = chan.makefile("rU")
while True:
cmd = f.readline().strip("\r\n")
myCmd = os.popen(cmd).read()
print(myCmd)
# chan.send("\r\nGot The Command, " + myCmd + ".\r\n")
chan.close()
except Exception as e:
print("*** Caught exception: " + str(e.__class__) + ": " + str(e))
traceback.print_exc()
try:
t.close()
except:
pass
sys.exit(1)
On my client, I have the following lines when I launch scp -v file_to_transfer root@192.168.34.10:/home/user/
root@192.168.34.10's password:
debug1: Authentication succeeded (password).
Authenticated to 192.168.34.10 ([192.168.34.10]:22).
debug1: channel 0: new [client-session]
debug1: Entering interactive session.
debug1: pledge: network
debug1: Sending environment.
debug1: Sending env XMODIFIERS = @im=none
debug1: Sending env LANG = fr_FR.UTF-8
debug1: Sending command: scp -v -t /home/user/
exec request failed on channel 0
lost connection
The ssh connection works well. But when the client send the command scp -v -t /home/user/ the exec request failed.
I've tried a lot and lot modification but I have no idea what to do to solve my issue...
Do you have an idea to solve my problem.
Thanks.
