aboutsummaryrefslogtreecommitdiff
path: root/test/proxy_core.py
blob: f6bb820138df6d81edd62beec2a82bacb14e806d (about) (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
# 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)