forked from shaba/openuds
added new tunnel server client
This commit is contained in:
Adolfo Gómez García
parent
2fd1dc5fc9
commit
7ae9df21a5
224
client-py3/full/src/uds/tunnel.py
Normal file
224
client-py3/full/src/uds/tunnel.py
Normal file
@ -0,0 +1,224 @@
|
||||
# -*- coding: utf-8 -*-
|
||||
#
|
||||
# Copyright (c) 2020 Virtual Cable S.L.U.
|
||||
# All rights reserved.
|
||||
#
|
||||
# Redistribution and use in source and binary forms, with or without modification,
|
||||
# are permitted provided that the following conditions are met:
|
||||
#
|
||||
# * Redistributions of source code must retain the above copyright notice,
|
||||
# this list of conditions and the following disclaimer.
|
||||
# * Redistributions in binary form must reproduce the above copyright notice,
|
||||
# this list of conditions and the following disclaimer in the documentation
|
||||
# and/or other materials provided with the distribution.
|
||||
# * Neither the name of Virtual Cable S.L. nor the names of its contributors
|
||||
# may be used to endorse or promote products derived from this software
|
||||
# without specific prior written permission.
|
||||
#
|
||||
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
|
||||
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
||||
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
|
||||
# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
|
||||
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
||||
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
|
||||
# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
|
||||
# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
|
||||
# OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
||||
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
||||
'''
|
||||
@author: Adolfo Gómez, dkmaster at dkmon dot com
|
||||
'''
|
||||
import socket
|
||||
import socketserver
|
||||
import ssl
|
||||
import threading
|
||||
import time
|
||||
import threading
|
||||
import select
|
||||
import typing
|
||||
import logging
|
||||
|
||||
HANDSHAKE_V1 = b'\x5AMGB\xA5\x01\x00'
|
||||
BUFFER_SIZE = 1024 * 16 # Max buffer length
|
||||
DEBUG = True
|
||||
LISTEN_ADDRESS = '0.0.0.0' if DEBUG else '127.0.0.1'
|
||||
|
||||
# ForwarServer states
|
||||
TUNNEL_LISTENING, TUNNEL_OPENING, TUNNEL_PROCESSING, TUNNEL_ERROR = 0, 1, 2, 3
|
||||
|
||||
logger = logging.getLogger(__name__)
|
||||
|
||||
class ForwardServer(socketserver.ThreadingTCPServer):
|
||||
daemon_threads = True
|
||||
allow_reuse_address = True
|
||||
|
||||
remote: typing.Tuple[str, int]
|
||||
ticket: str
|
||||
stop_flag: threading.Event
|
||||
timeout: int
|
||||
timer: typing.Optional[threading.Timer]
|
||||
check_certificate: bool
|
||||
current_connections: int
|
||||
status: int
|
||||
|
||||
def __init__(
|
||||
self,
|
||||
remote: typing.Tuple[str, int],
|
||||
ticket: str,
|
||||
timeout: int = 0,
|
||||
local_port: int = 0,
|
||||
check_certificate: bool = True,
|
||||
) -> None:
|
||||
super().__init__(
|
||||
server_address=(LISTEN_ADDRESS, local_port), RequestHandlerClass=Handler
|
||||
)
|
||||
self.remote = remote
|
||||
self.ticket = ticket
|
||||
self.timeout = int(time.time()) + timeout if timeout else 0
|
||||
self.check_certificate = check_certificate
|
||||
self.stop_flag = threading.Event() # False initial
|
||||
self.current_connections = 0
|
||||
|
||||
self.status = TUNNEL_LISTENING
|
||||
|
||||
if timeout:
|
||||
self.timer = threading.Timer(timeout, ForwardServer.__checkStarted, args=(self,))
|
||||
self.timer.start()
|
||||
else:
|
||||
self.timer = None
|
||||
|
||||
def stop(self) -> None:
|
||||
if not self.stop_flag.is_set():
|
||||
logger.debug('Stopping servers')
|
||||
self.stop_flag.set()
|
||||
if self.timer:
|
||||
self.timer.cancel()
|
||||
self.timer = None
|
||||
self.shutdown()
|
||||
|
||||
@property
|
||||
def stoppable(self) -> bool:
|
||||
return self.timeout != 0 and int(time.time()) > self.timeout
|
||||
|
||||
@staticmethod
|
||||
def __checkStarted(fs: 'ForwardServer') -> None:
|
||||
fs.timer = None
|
||||
if fs.current_connections <= 0:
|
||||
fs.stop()
|
||||
|
||||
|
||||
class Handler(socketserver.BaseRequestHandler):
|
||||
# Override Base type
|
||||
server: ForwardServer
|
||||
|
||||
# server: ForwardServer
|
||||
def handle(self) -> None:
|
||||
self.server.current_connections += 1
|
||||
self.server.status = TUNNEL_OPENING
|
||||
|
||||
# If server processing is over time
|
||||
if self.server.stoppable:
|
||||
logger.info('Rejected timedout connection try')
|
||||
self.request.close() # End connection without processing it
|
||||
return
|
||||
|
||||
# Open remote connection
|
||||
try:
|
||||
with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as rsocket:
|
||||
logger.info('CONNECT to %s', self.server.remote)
|
||||
logger.debug('Ticket %s', self.server.remote, self.server.ticket)
|
||||
|
||||
rsocket.connect(self.server.remote)
|
||||
|
||||
context = ssl.create_default_context()
|
||||
|
||||
# If ignore remote certificate
|
||||
if self.server.check_certificate is False:
|
||||
context.check_hostname = False
|
||||
context.verify_mode = ssl.CERT_NONE
|
||||
logger.warning('Certificate checking is disabled!')
|
||||
|
||||
with context.wrap_socket(
|
||||
rsocket, server_hostname=self.server.remote[0]
|
||||
) as ssl_socket:
|
||||
# Send handhshake + command + ticket
|
||||
ssl_socket.sendall(
|
||||
HANDSHAKE_V1 + b'OPEN' + self.server.ticket.encode()
|
||||
)
|
||||
# Check response is OK
|
||||
data = ssl_socket.recv(2)
|
||||
if data != b'OK':
|
||||
data += ssl_socket.recv(128)
|
||||
raise Exception(f'Error received: {data.decode()}') # Notify error
|
||||
|
||||
# All is fine, now we can tunnel data
|
||||
self.process(remote=ssl_socket)
|
||||
except Exception as e:
|
||||
logger.error(f'Error connecting to {self.server.remote!s}: {e!s}')
|
||||
self.server.status = TUNNEL_ERROR
|
||||
self.server.stop()
|
||||
finally:
|
||||
self.server.current_connections -= 1
|
||||
|
||||
if self.server.current_connections <= 0 and self.server.stoppable:
|
||||
self.server.stop()
|
||||
|
||||
# Processes data forwarding
|
||||
def process(self, remote: ssl.SSLSocket):
|
||||
self.server.status = TUNNEL_PROCESSING
|
||||
logger.debug('Processing tunnel with ticket %s', self.server.ticket)
|
||||
# Process data until stop requested or connection closed
|
||||
try:
|
||||
while not self.server.stop_flag.is_set():
|
||||
r, _w, _x = select.select([self.request, remote], [], [], 1.0)
|
||||
if self.request in r:
|
||||
data = self.request.recv(BUFFER_SIZE)
|
||||
if not data:
|
||||
break
|
||||
remote.sendall(data)
|
||||
if remote in r:
|
||||
data = remote.recv(BUFFER_SIZE)
|
||||
if not data:
|
||||
break
|
||||
self.request.sendall(data)
|
||||
logger.debug('Finished tunnel with ticekt %s', self.server.ticket)
|
||||
except Exception as e:
|
||||
pass
|
||||
|
||||
def _run(server: ForwardServer) -> None:
|
||||
logger.debug('Starting forwarder: %s -> %s, timeout: %d', server.server_address, server.remote, server.timeout)
|
||||
server.serve_forever()
|
||||
logger.debug('Stoped forwarded %s -> %s', server.server_address, server.remote)
|
||||
|
||||
def forward(
|
||||
remote: typing.Tuple[str, int],
|
||||
ticket: str,
|
||||
timeout: int = 0,
|
||||
local_port: int = 0,
|
||||
check_certificate=True,
|
||||
) -> ForwardServer:
|
||||
fs = ForwardServer(
|
||||
remote=remote,
|
||||
ticket=ticket,
|
||||
timeout=timeout,
|
||||
local_port=local_port,
|
||||
check_certificate=check_certificate,
|
||||
)
|
||||
# Starts a new thread
|
||||
threading.Thread(target=_run, args=(fs,)).start()
|
||||
|
||||
return fs
|
||||
|
||||
if __name__ == "__main__":
|
||||
import sys
|
||||
log = logging.getLogger()
|
||||
log.setLevel(logging.DEBUG)
|
||||
handler = logging.StreamHandler(sys.stdout)
|
||||
handler.setLevel(logging.DEBUG)
|
||||
formatter = logging.Formatter(
|
||||
'%(levelname)s - %(message)s'
|
||||
) # Basic log format, nice for syslog
|
||||
handler.setFormatter(formatter)
|
||||
log.addHandler(handler)
|
||||
|
||||
fs = forward(('172.27.0.1', 7777), '1'*64, local_port=49999, timeout=10, check_certificate=False)
|
||||
Loading…
Reference in New Issue
Block a user