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# SPDX-License-Identifier: BSD-3-Clause
"""
The core for a "virtual network" proxy.
"""
# This file is part of Haketilo.
#
# Copyright (c) 2015, inaz2
# Copyright (C) 2021 jahoti <jahoti@tilde.team>
# Copyright (C) 2021 Wojtek Kosior <koszko@koszko.org>
#
# 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 proxy2 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.
#
#
# I, Wojtek Kosior, thereby promise not to sue for violation of this file's
# license. Although I request that you do not make use of this code in a way
# incompliant with the license, I am not going to enforce this in court.
from pathlib import Path
import socket, ssl, subprocess, sys, threading
from http.server import HTTPServer, BaseHTTPRequestHandler
from socketserver import ThreadingMixIn
lock = threading.Lock()
class ProxyRequestHandler(BaseHTTPRequestHandler):
"""
Handles a network request made to the proxy. Configures SSL encryption when
needed.
"""
def __init__(self, *args, **kwargs):
"""
Initialize self. Uses the same arguments as
http.server.BaseHTTPRequestHandler's constructor but also expect a
`certdir` keyword argument with appropriate path.
"""
self.certdir = Path(kwargs.pop('certdir')).resolve()
super().__init__(*args, **kwargs)
def log_error(self, *args, **kwargs):
"""
Like log_error in http.server.BaseHTTPRequestHandler but suppresses
"Request timed out: timeout('timed out',)".
"""
if not isinstance(args[0], socket.timeout):
super().log_error(*args, **kwargs)
def get_cert(self, hostname):
"""
If needed, generate a signed x509 certificate for `hostname`. Return
paths to certificate's key file and to certificate itself in a tuple.
"""
root_keyfile = self.certdir / 'rootCA.key'
root_certfile = self.certdir / 'rootCA.pem'
keyfile = self.certdir / 'site.key'
certfile = self.certdir / f'{hostname}.crt'
with lock:
requestfile = self.certdir / f'{hostname}.csr'
if not certfile.exists():
subprocess.run([
'openssl', 'req', '-new', '-key', str(keyfile),
'-subj', f'/CN={hostname}', '-out', str(requestfile)
], check=True)
subprocess.run([
'openssl', 'x509', '-req', '-in', str(requestfile),
'-CA', str(root_certfile), '-CAkey', str(root_keyfile),
'-CAcreateserial', '-out', str(certfile), '-days', '1024'
], check=True)
return keyfile, certfile
def do_CONNECT(self):
"""Wrap the connection with SSL using on-demand signed certificate."""
hostname = self.path.split(':')[0]
sslargs = {'server_side': True}
sslargs['keyfile'], sslargs['certfile'] = self.get_cert(hostname)
self.send_response(200)
self.end_headers()
self.connection = ssl.wrap_socket(self.connection, **sslargs)
self.rfile = self.connection.makefile('rb', self.rbufsize)
self.wfile = self.connection.makefile('wb', self.wbufsize)
connection_header = self.headers.get('Proxy-Connection', '').lower()
self.close_connection = int(connection_header == 'close')
def do_GET(self):
content_length = int(self.headers.get('Content-Length', 0))
req_body = self.rfile.read(content_length) if content_length else None
if self.path[0] == '/':
secure = 's' if isinstance(self.connection, ssl.SSLSocket) else ''
self.path = f'http{secure}://{self.headers["Host"]}{self.path}'
self.handle_request(req_body)
do_OPTIONS = do_DELETE = do_PUT = do_HEAD = do_POST = do_GET
def handle_request(self, req_body):
"""Default handler that does nothing. Please override."""
pass
class ThreadingHTTPServer(ThreadingMixIn, HTTPServer):
"""The actual proxy server"""
address_family, daemon_threads = socket.AF_INET6, True
def handle_error(self, request, client_address):
"""
Like handle_error in http.server.HTTPServer but suppresses socket/ssl
related errors.
"""
cls, e = sys.exc_info()[:2]
if not (cls is socket.error or cls is ssl.SSLError):
return super().handle_error(request, client_address)
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