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 Paramiko SCPServer Example
#1
Hi
I would like to implement a scp server using paramiko,
Can anyone post an example
Below is the SSH server I am using is there a way to teak the code to support file Transfer upload/download to any client conntected
Thanks in advane
'''
Install Packages
pip install gssapi
pip install paramiko
ssh micki@127.0.0.1 -p 2200
pip install pywin32
pip install python-gssapi
'''

import base64

import time
from binascii import hexlify
import os
import socket
import sys
import threading
import traceback
from warnings import cls

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):
        self.event = threading.Event()

    def check_channel_request(self, kind, chanid):
        if kind == "session":
            return paramiko.OPEN_SUCCEEDED
        return paramiko.OPEN_FAILED_ADMINISTRATIVELY_PROHIBITED

    def check_auth_password(self, username, password):
        if (username == "xxx") and (password == "xxx"):
            return paramiko.AUTH_SUCCESSFUL
        return paramiko.AUTH_FAILED

    def check_auth_publickey(self, username, key):
        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
    ):
        """
        .. 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
    ):
        if gss_authenticated == paramiko.AUTH_SUCCESSFUL:
            return paramiko.AUTH_SUCCESSFUL
        return paramiko.AUTH_FAILED

    def enable_auth_gssapi(self):
        return True

    def get_allowed_auths(self, username):
        return "gssapi-keyex,gssapi-with-mic,password,publickey"

    def check_channel_shell_request(self, channel):
        self.event.set()
        return True

    def check_channel_pty_request(
        self, channel, term, width, height, pixelwidth, pixelheight, modes
    ):
        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(("", 2200))
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=("127.0.0.1", "2200"))
    transport.connect(username="micki", password="micki")
    cls._connection = SFTPClient.from_transport(transport)


    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)
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