forked from shaba/openuds
No needed anymore here. It's already on client
This commit is contained in:
Adolfo Gómez García
parent
b914980793
commit
acd1dd4702
@ -39,6 +39,8 @@ import select
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import typing
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import logging
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import certifi
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HANDSHAKE_V1 = b'\x5AMGB\xA5\x01\x00'
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BUFFER_SIZE = 1024 * 16 # Max buffer length
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DEBUG = True
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@ -116,6 +118,7 @@ class ForwardServer(socketserver.ThreadingTCPServer):
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# Do not "recompress" data, use only "base protocol" compression
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context.options |= ssl.OP_NO_COMPRESSION
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context.load_verify_locations(certifi.where()) # Load certifi certificates
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# If ignore remote certificate
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if self.check_certificate is False:
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@ -1,278 +0,0 @@
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# -*- coding: utf-8 -*-
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#
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# Copyright (c) 2021 Virtual Cable S.L.U.
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without modification,
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# are permitted provided that the following conditions are met:
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#
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# * Redistributions of source code must retain the above copyright notice,
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# this list of conditions and the following disclaimer.
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# * Redistributions in binary form must reproduce the above copyright notice,
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# this list of conditions and the following disclaimer in the documentation
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# and/or other materials provided with the distribution.
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# * Neither the name of Virtual Cable S.L. nor the names of its contributors
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# may be used to endorse or promote products derived from this software
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# without specific prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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# OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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'''
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@author: Adolfo Gómez, dkmaster at dkmon dot com
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'''
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import socket
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import socketserver
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import ssl
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import threading
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import time
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import random
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import threading
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import select
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import typing
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import logging
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HANDSHAKE_V1 = b'\x5AMGB\xA5\x01\x00'
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BUFFER_SIZE = 1024 * 16 # Max buffer length
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DEBUG = True
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LISTEN_ADDRESS = '0.0.0.0' if DEBUG else '127.0.0.1'
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# ForwarServer states
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TUNNEL_LISTENING, TUNNEL_OPENING, TUNNEL_PROCESSING, TUNNEL_ERROR = 0, 1, 2, 3
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logger = logging.getLogger(__name__)
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class ForwardServer(socketserver.ThreadingTCPServer):
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daemon_threads = True
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allow_reuse_address = True
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remote: typing.Tuple[str, int]
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ticket: str
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stop_flag: threading.Event
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can_stop: bool
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timeout: int
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timer: typing.Optional[threading.Timer]
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check_certificate: bool
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current_connections: int
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status: int
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def __init__(
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self,
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remote: typing.Tuple[str, int],
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ticket: str,
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timeout: int = 0,
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local_port: int = 0,
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check_certificate: bool = True,
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) -> None:
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local_port = local_port or random.randrange(33000, 53000)
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super().__init__(
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server_address=(LISTEN_ADDRESS, local_port), RequestHandlerClass=Handler
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)
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self.remote = remote
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self.ticket = ticket
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# Negative values for timeout, means "accept always connections"
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# "but if no connection is stablished on timeout (positive)"
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# "stop the listener"
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self.timeout = int(time.time()) + timeout if timeout > 0 else 0
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self.check_certificate = check_certificate
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self.stop_flag = threading.Event() # False initial
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self.current_connections = 0
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self.status = TUNNEL_LISTENING
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self.can_stop = False
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timeout = abs(timeout) or 60
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self.timer = threading.Timer(
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abs(timeout), ForwardServer.__checkStarted, args=(self,)
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)
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self.timer.start()
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def stop(self) -> None:
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if not self.stop_flag.is_set():
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logger.debug('Stopping servers')
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self.stop_flag.set()
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if self.timer:
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self.timer.cancel()
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self.timer = None
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self.shutdown()
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def connect(self) -> ssl.SSLSocket:
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with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as rsocket:
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logger.info('CONNECT to %s', self.remote)
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rsocket.connect(self.remote)
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context = ssl.create_default_context()
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# Do not "recompress" data, use only "base protocol" compression
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context.options |= ssl.OP_NO_COMPRESSION
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# If ignore remote certificate
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if self.check_certificate is False:
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context.check_hostname = False
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context.verify_mode = ssl.CERT_NONE
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logger.warning('Certificate checking is disabled!')
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return context.wrap_socket(rsocket, server_hostname=self.remote[0])
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def check(self) -> bool:
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if self.status == TUNNEL_ERROR:
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return False
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try:
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with self.connect() as ssl_socket:
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ssl_socket.sendall(HANDSHAKE_V1 + b'TEST')
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resp = ssl_socket.recv(2)
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if resp != b'OK':
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raise Exception({'Invalid tunnelresponse: {resp}'})
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return True
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except Exception as e:
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logger.error(
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'Error connecting to tunnel server %s: %s', self.server_address, e
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)
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return False
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@property
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def stoppable(self) -> bool:
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logger.debug('Is stoppable: %s', self.can_stop)
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return self.can_stop or (self.timeout != 0 and int(time.time()) > self.timeout)
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@staticmethod
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def __checkStarted(fs: 'ForwardServer') -> None:
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logger.debug('New connection limit reached')
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fs.timer = None
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fs.can_stop = True
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if fs.current_connections <= 0:
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fs.stop()
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class Handler(socketserver.BaseRequestHandler):
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# Override Base type
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server: ForwardServer
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# server: ForwardServer
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def handle(self) -> None:
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self.server.status = TUNNEL_OPENING
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# If server processing is over time
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if self.server.stoppable:
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self.server.status = TUNNEL_ERROR
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logger.info('Rejected timedout connection')
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self.request.close() # End connection without processing it
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return
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self.server.current_connections += 1
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# Open remote connection
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try:
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logger.debug('Ticket %s', self.server.ticket)
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with self.server.connect() as ssl_socket:
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# Send handhshake + command + ticket
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ssl_socket.sendall(HANDSHAKE_V1 + b'OPEN' + self.server.ticket.encode())
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# Check response is OK
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data = ssl_socket.recv(2)
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if data != b'OK':
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data += ssl_socket.recv(128)
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raise Exception(
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f'Error received: {data.decode(errors="ignore")}'
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) # Notify error
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# All is fine, now we can tunnel data
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self.process(remote=ssl_socket)
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except Exception as e:
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logger.error(f'Error connecting to {self.server.remote!s}: {e!s}')
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self.server.status = TUNNEL_ERROR
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self.server.stop()
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finally:
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self.server.current_connections -= 1
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if self.server.current_connections <= 0 and self.server.stoppable:
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self.server.stop()
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# Processes data forwarding
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def process(self, remote: ssl.SSLSocket):
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self.server.status = TUNNEL_PROCESSING
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logger.debug('Processing tunnel with ticket %s', self.server.ticket)
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# Process data until stop requested or connection closed
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try:
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while not self.server.stop_flag.is_set():
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r, _w, _x = select.select([self.request, remote], [], [], 1.0)
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if self.request in r:
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data = self.request.recv(BUFFER_SIZE)
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if not data:
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break
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remote.sendall(data)
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if remote in r:
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data = remote.recv(BUFFER_SIZE)
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if not data:
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break
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self.request.sendall(data)
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logger.debug('Finished tunnel with ticekt %s', self.server.ticket)
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except Exception as e:
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pass
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def _run(server: ForwardServer) -> None:
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logger.debug(
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'Starting forwarder: %s -> %s, timeout: %d',
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server.server_address,
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server.remote,
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server.timeout,
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)
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server.serve_forever()
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logger.debug('Stoped forwarder %s -> %s', server.server_address, server.remote)
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def forward(
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remote: typing.Tuple[str, int],
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ticket: str,
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timeout: int = 0,
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local_port: int = 0,
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check_certificate=True,
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) -> ForwardServer:
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fs = ForwardServer(
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remote=remote,
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ticket=ticket,
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timeout=timeout,
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local_port=local_port,
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check_certificate=check_certificate,
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)
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# Starts a new thread
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threading.Thread(target=_run, args=(fs,)).start()
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return fs
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if __name__ == "__main__":
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import sys
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log = logging.getLogger()
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log.setLevel(logging.DEBUG)
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handler = logging.StreamHandler(sys.stdout)
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handler.setLevel(logging.DEBUG)
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formatter = logging.Formatter(
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'%(levelname)s - %(message)s'
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) # Basic log format, nice for syslog
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handler.setFormatter(formatter)
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log.addHandler(handler)
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ticket = 'mffqg7q4s61fvx0ck2pe0zke6k0c5ipb34clhbkbs4dasb4g'
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fs = forward(
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('172.27.0.1', 7777),
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ticket,
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local_port=49999,
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timeout=-20,
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check_certificate=False,
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)
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