forked from shaba/openuds
Upgraded tunnel.py to last real one
This commit is contained in:
Adolfo Gómez García
parent
4424f2a497
commit
011145e911
@ -1,6 +1,6 @@
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# -*- coding: utf-8 -*-
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#
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# Copyright (c) 2020 Virtual Cable S.L.U.
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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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@ -33,6 +33,7 @@ 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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@ -48,6 +49,7 @@ 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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@ -55,6 +57,7 @@ class ForwardServer(socketserver.ThreadingTCPServer):
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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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@ -69,23 +72,30 @@ class ForwardServer(socketserver.ThreadingTCPServer):
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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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self.timeout = int(time.time()) + timeout if timeout else 0
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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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if timeout:
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self.timer = threading.Timer(timeout, ForwardServer.__checkStarted, args=(self,))
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self.timer.start()
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else:
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self.timer = None
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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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@ -96,13 +106,52 @@ class ForwardServer(socketserver.ThreadingTCPServer):
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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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return self.timeout != 0 and int(time.time()) > self.timeout
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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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@ -113,46 +162,33 @@ class Handler(socketserver.BaseRequestHandler):
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# server: ForwardServer
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def handle(self) -> None:
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self.server.current_connections += 1
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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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logger.info('Rejected timedout connection try')
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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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with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as rsocket:
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logger.info('CONNECT to %s', self.server.remote)
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logger.debug('Ticket %s', self.server.ticket)
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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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rsocket.connect(self.server.remote)
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context = ssl.create_default_context()
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# If ignore remote certificate
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if self.server.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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with context.wrap_socket(
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rsocket, server_hostname=self.server.remote[0]
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) as ssl_socket:
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# Send handhshake + command + ticket
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ssl_socket.sendall(
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HANDSHAKE_V1 + b'OPEN' + self.server.ticket.encode()
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)
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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(f'Error received: {data.decode()}') # 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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# 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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@ -185,10 +221,17 @@ class Handler(socketserver.BaseRequestHandler):
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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('Starting forwarder: %s -> %s, timeout: %d', server.server_address, server.remote, server.timeout)
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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 forwarded %s -> %s', server.server_address, server.remote)
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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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@ -197,6 +240,7 @@ def forward(
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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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@ -209,8 +253,10 @@ def forward(
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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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@ -221,4 +267,12 @@ if __name__ == "__main__":
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handler.setFormatter(formatter)
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log.addHandler(handler)
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fs = forward(('172.27.0.1', 7777), '1'*64, local_port=49999, timeout=10, check_certificate=False)
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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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