From 53d77ce9116d2cbe1f79d63bd5c09b70ac09c60c Mon Sep 17 00:00:00 2001
From: Dmitri Bogomolov <4glitch@gmail.com>
Date: Tue, 23 Jul 2019 18:57:46 +0300
Subject: [PATCH] Dumb tor configurator using stem

---
 src/plugins/proxyconfig_stem.py | 111 ++++++++++++++++++++++++++++++++
 1 file changed, 111 insertions(+)
 create mode 100644 src/plugins/proxyconfig_stem.py

diff --git a/src/plugins/proxyconfig_stem.py b/src/plugins/proxyconfig_stem.py
new file mode 100644
index 00000000..567d8253
--- /dev/null
+++ b/src/plugins/proxyconfig_stem.py
@@ -0,0 +1,111 @@
+# -*- coding: utf-8 -*-
+
+import os
+import logging
+import random  # noseq
+import tempfile
+
+import stem
+import stem.control
+import stem.process
+
+
+class DebugLogger(object):
+    """Safe logger wrapper for tor and plugin's logs"""
+    # pylint: disable=too-few-public-methods
+    def __init__(self):
+        self._logger = logging.getLogger(__name__.split('.', 1)[0])
+        self._levels = {
+            'err': 40,
+            'warn': 30,
+            'notice': 20
+        }
+
+    def __call__(self, line):
+        try:
+            level, line = line.split('[', 1)[1].split(']')
+        except IndexError:
+            # Plugin's debug or unexpected log line from tor
+            self._logger.debug(line)
+        else:
+            self._logger.log(self._levels.get(level, 10), '(tor)' + line)
+
+
+def connect_plugin(config):
+    """Run stem proxy configurator"""
+    logwrite = DebugLogger()
+    if config.safeGet('bitmessagesettings', 'sockshostname') not in (
+        'localhost', '127.0.0.1', ''
+    ):
+        # remote proxy is choosen for outbound connections,
+        # nothing to do here, but need to set socksproxytype to SOCKS5!
+        logwrite(
+            'sockshostname is set to remote address,'
+            ' aborting stem proxy configuration')
+        return
+
+    datadir = tempfile.mkdtemp()
+    control_socket = os.path.join(datadir, 'control')
+    tor_config = {
+        'SocksPort': '9050',
+        # 'DataDirectory': datadir,  # had an exception with control socket
+        'ControlSocket': control_socket
+    }
+    port = config.safeGet('bitmessagesettings', 'socksport', '9050')
+    for attempt in range(50):
+        if attempt > 0:
+            port = random.randint(32767, 65535)
+            tor_config['SocksPort'] = str(port)
+        # It's recommended to use separate tor instance for hidden services.
+        # So if there is a system wide tor, use it for outbound connections.
+        try:
+            stem.process.launch_tor_with_config(
+                tor_config, take_ownership=True, init_msg_handler=logwrite)
+        except OSError:
+            continue
+        else:
+            logwrite('Started tor on port %s' % port)
+            break
+
+    if config.safeGetBoolean('bitmessagesettings', 'sockslisten'):
+        # need a hidden service for inbound connections
+        try:
+            controller = stem.control.Controller.from_socket_file(
+                control_socket)
+            controller.authenticate()
+        except stem.SocketError:
+            # something goes wrong way
+            logwrite('Failed to instantiate or authenticate on controller')
+            return
+
+        onionhostname = config.safeGet('bitmessagesettings', 'onionhostname')
+        onionkey = config.safeGet(onionhostname, 'privsigningkey')
+        if onionhostname and not onionkey:
+            logwrite('The hidden service found in config ): %s' % onionhostname)
+        onionkeytype = config.safeGet(onionhostname, 'keytype')
+
+        response = controller.create_ephemeral_hidden_service(
+            config.safeGetInt('bitmessagesettings', 'onionport', 8444),
+            key_type=(onionkeytype or 'NEW'),
+            key_content=(onionkey or 'BEST')
+        )
+
+        if not response.is_ok():
+            logwrite('Bad response from controller ):')
+            return
+
+        if not onionkey:
+            if not onionhostname:
+                onionhostname = response.service_id + '.onion'
+                config.set(
+                    'bitmessagesettings', 'onionhostname', onionhostname)
+            else:
+                onionhostname = response.service_id + '.onion'
+            logwrite('Started hidden service %s' % onionhostname)
+            config.add_section(onionhostname)
+            config.set(
+                onionhostname, 'privsigningkey', response.private_key)
+            config.set(
+                onionhostname, 'keytype', response.private_key_type)
+            config.save()
+        config.set('bitmessagesettings', 'socksproxytype', 'SOCKS5')