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# -*- coding: utf-8 -*-
"""
OnionShare | https://onionshare.org/
Copyright (C) 2014-2022 Micah Lee, et al. <micah@micahflee.com>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
"""
import os
import subprocess
import time
class Meek(object):
"""
The Meek object starts the meek-client as a subprocess.
This process is used to do domain-fronting to connect to
the Tor APIs for censorship circumvention and retrieving
bridges, before connecting to Tor.
"""
def __init__(self, common, get_tor_paths=None):
"""
Set up the Meek object
"""
self.common = common
self.common.log("Meek", "__init__")
# Set the path of the meek binary
if not get_tor_paths:
get_tor_paths = self.common.get_tor_paths
(
self.tor_path,
self.tor_geo_ip_file_path,
self.tor_geo_ipv6_file_path,
self.obfs4proxy_file_path,
self.snowflake_file_path,
self.meek_client_file_path,
) = get_tor_paths()
self.meek_proxies = {}
self.meek_url = "https://moat.torproject.org.global.prod.fastly.net/"
self.meek_front = "cdn.sstatic.net"
self.meek_env = {
"TOR_PT_MANAGED_TRANSPORT_VER": "1",
"TOR_PT_CLIENT_TRANSPORTS": "meek",
}
self.meek_host = "127.0.0.1"
self.meek_port = None
def start(self):
"""
Start the Meek Client and populate the SOCKS proxies dict
for use with requests to the Tor Moat API.
"""
# Abort early if we can't find the Meek client
if self.meek_client_file_path is None or not os.path.exists(
self.meek_client_file_path
):
raise MeekNotFound()
# Start the Meek Client as a subprocess.
self.common.log("Meek", "start", "Starting meek client")
if self.common.platform == "Windows":
env = os.environ.copy()
for key in self.meek_env:
env[key] = self.meek_env[key]
# In Windows, hide console window when opening meek-client.exe subprocess
startupinfo = subprocess.STARTUPINFO()
startupinfo.dwFlags |= subprocess.STARTF_USESHOWWINDOW
self.meek_proc = subprocess.Popen(
[
self.meek_client_file_path,
"--url",
self.meek_url,
"--front",
self.meek_front,
],
stdout=subprocess.PIPE,
stderr=subprocess.PIPE,
startupinfo=startupinfo,
bufsize=1,
env=env,
text=True,
)
else:
self.meek_proc = subprocess.Popen(
[
self.meek_client_file_path,
"--url",
self.meek_url,
"--front",
self.meek_front,
],
stdout=subprocess.PIPE,
stderr=subprocess.PIPE,
bufsize=1,
env=self.meek_env,
# Using universal_newlines instead of text because the snap package using python < 3.7
universal_newlines=True,
)
# Obtain the host and port that meek is running on
for line in iter(self.meek_proc.stdout.readline, b""):
if "CMETHOD meek socks5" in line:
self.meek_host = line.split(" ")[3].split(":")[0]
self.meek_port = line.split(" ")[3].split(":")[1]
self.common.log(
"Meek",
"start",
f"Meek running on {self.meek_host}:{self.meek_port}",
)
break
if "CMETHOD-ERROR" in line:
self.cleanup()
raise MeekNotRunning()
break
if self.meek_port:
self.meek_proxies = {
"http": f"socks5h://{self.meek_host}:{self.meek_port}",
"https": f"socks5h://{self.meek_host}:{self.meek_port}",
}
else:
self.common.log("Meek", "start", "Could not obtain the meek port")
self.cleanup()
raise MeekNotRunning()
def cleanup(self):
"""
Kill any meek subprocesses.
"""
self.common.log("Meek", "cleanup")
if self.meek_proc:
self.meek_proc.terminate()
time.sleep(0.2)
if self.meek_proc.poll() is None:
self.common.log(
"Meek",
"cleanup",
"Tried to terminate meek-client process but it's still running",
)
try:
self.meek_proc.kill()
time.sleep(0.2)
if self.meek_proc.poll() is None:
self.common.log(
"Meek",
"cleanup",
"Tried to kill meek-client process but it's still running",
)
except Exception:
self.common.log(
"Meek", "cleanup", "Exception while killing meek-client process"
)
self.meek_proc = None
# Reset other Meek settings
self.meek_proxies = {}
self.meek_port = None
class MeekNotRunning(Exception):
"""
We were unable to start Meek or obtain the port
number it started on, in order to do domain fronting.
"""
class MeekNotFound(Exception):
"""
We were unable to find the Meek Client binary.
"""
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