from __future__ import absolute_import from six import text_type from typing import Any, Union, Mapping, Optional from django.conf import settings from django.utils import timezone from django.contrib.sessions.models import Session as djSession try: from django.middleware.csrf import _compare_salted_tokens except ImportError: # This function was added in Django 1.10. def _compare_salted_tokens(token1, token2): # type: (str, str) -> bool return token1 == token2 import sockjs.tornado from sockjs.tornado.session import ConnectionInfo import tornado.ioloop import ujson import logging import time from zerver.models import UserProfile, get_user_profile_by_id, get_client from zerver.lib.queue import queue_json_publish from zerver.lib.actions import check_send_message, extract_recipients from zerver.decorator import JsonableError from zerver.lib.utils import statsd from zerver.middleware import record_request_start_data, record_request_stop_data, \ record_request_restart_data, write_log_line, format_timedelta from zerver.lib.redis_utils import get_redis_client from zerver.lib.session_user import get_session_user from zerver.tornado.event_queue import get_client_descriptor logger = logging.getLogger('zulip.socket') def get_user_profile(session_id): # type: (Optional[text_type]) -> Optional[UserProfile] if session_id is None: return None try: djsession = djSession.objects.get(expire_date__gt=timezone.now(), session_key=session_id) except djSession.DoesNotExist: return None try: return UserProfile.objects.get(pk=get_session_user(djsession)) except (UserProfile.DoesNotExist, KeyError): return None connections = dict() # type: Dict[Union[int, str], SocketConnection] def get_connection(id): # type: (Union[int, str]) -> SocketConnection return connections.get(id) def register_connection(id, conn): # type: (Union[int, str], SocketConnection) -> None # Kill any old connections if they exist if id in connections: connections[id].close() conn.client_id = id connections[conn.client_id] = conn def deregister_connection(conn): # type: (SocketConnection) -> None del connections[conn.client_id] redis_client = get_redis_client() def req_redis_key(req_id): # type: (text_type) -> text_type return u'socket_req_status:%s' % (req_id,) class SocketAuthError(Exception): def __init__(self, msg): # type: (str) -> None self.msg = msg class CloseErrorInfo(object): def __init__(self, status_code, err_msg): # type: (int, str) -> None self.status_code = status_code self.err_msg = err_msg class SocketConnection(sockjs.tornado.SockJSConnection): client_id = None # type: Optional[Union[int, str]] def on_open(self, info): # type: (ConnectionInfo) -> None log_data = dict(extra='[transport=%s]' % (self.session.transport_name,)) record_request_start_data(log_data) ioloop = tornado.ioloop.IOLoop.instance() self.authenticated = False self.session.user_profile = None self.close_info = None # type: CloseErrorInfo self.did_close = False try: self.browser_session_id = info.get_cookie(settings.SESSION_COOKIE_NAME).value self.csrf_token = info.get_cookie(settings.CSRF_COOKIE_NAME).value except AttributeError: # The request didn't contain the necessary cookie values. We can't # close immediately because sockjs-tornado doesn't expect a close # inside on_open(), so do it on the next tick. self.close_info = CloseErrorInfo(403, "Initial cookie lacked required values") ioloop.add_callback(self.close) return def auth_timeout(): # type: () -> None self.close_info = CloseErrorInfo(408, "Timeout while waiting for authentication") self.close() self.timeout_handle = ioloop.add_timeout(time.time() + 10, auth_timeout) write_log_line(log_data, path='/socket/open', method='SOCKET', remote_ip=info.ip, email='unknown', client_name='?') def authenticate_client(self, msg): # type: (Dict[str, Any]) -> None if self.authenticated: self.session.send_message({'req_id': msg['req_id'], 'type': 'response', 'response': {'result': 'error', 'msg': 'Already authenticated'}}) return user_profile = get_user_profile(self.browser_session_id) if user_profile is None: raise SocketAuthError('Unknown or missing session') self.session.user_profile = user_profile if not _compare_salted_tokens(msg['request']['csrf_token'], self.csrf_token): raise SocketAuthError('CSRF token does not match that in cookie') if 'queue_id' not in msg['request']: raise SocketAuthError("Missing 'queue_id' argument") queue_id = msg['request']['queue_id'] client = get_client_descriptor(queue_id) if client is None: raise SocketAuthError('Bad event queue id: %s' % (queue_id,)) if user_profile.id != client.user_profile_id: raise SocketAuthError("You are not the owner of the queue with id '%s'" % (queue_id,)) self.authenticated = True register_connection(queue_id, self) response = {'req_id': msg['req_id'], 'type': 'response', 'response': {'result': 'success', 'msg': ''}} status_inquiries = msg['request'].get('status_inquiries') if status_inquiries is not None: results = {} for inquiry in status_inquiries: status = redis_client.hgetall(req_redis_key(inquiry)) if len(status) == 0: status['status'] = 'not_received' if 'response' in status: status['response'] = ujson.loads(status['response']) results[str(inquiry)] = status response['response']['status_inquiries'] = results self.session.send_message(response) ioloop = tornado.ioloop.IOLoop.instance() ioloop.remove_timeout(self.timeout_handle) def on_message(self, msg_raw): # type: (str) -> None log_data = dict(extra='[transport=%s' % (self.session.transport_name,)) record_request_start_data(log_data) msg = ujson.loads(msg_raw) if self.did_close: logger.info("Received message on already closed socket! transport=%s user=%s client_id=%s" % (self.session.transport_name, self.session.user_profile.email if self.session.user_profile is not None else 'unknown', self.client_id)) self.session.send_message({'req_id': msg['req_id'], 'type': 'ack'}) if msg['type'] == 'auth': log_data['extra'] += ']' try: self.authenticate_client(msg) # TODO: Fill in the correct client write_log_line(log_data, path='/socket/auth', method='SOCKET', remote_ip=self.session.conn_info.ip, email=self.session.user_profile.email, client_name='?') except SocketAuthError as e: response = {'result': 'error', 'msg': e.msg} self.session.send_message({'req_id': msg['req_id'], 'type': 'response', 'response': response}) write_log_line(log_data, path='/socket/auth', method='SOCKET', remote_ip=self.session.conn_info.ip, email='unknown', client_name='?', status_code=403, error_content=ujson.dumps(response)) return else: if not self.authenticated: response = {'result': 'error', 'msg': "Not yet authenticated"} self.session.send_message({'req_id': msg['req_id'], 'type': 'response', 'response': response}) write_log_line(log_data, path='/socket/service_request', method='SOCKET', remote_ip=self.session.conn_info.ip, email='unknown', client_name='?', status_code=403, error_content=ujson.dumps(response)) return redis_key = req_redis_key(msg['req_id']) with redis_client.pipeline() as pipeline: pipeline.hmset(redis_key, {'status': 'received'}) pipeline.expire(redis_key, 60 * 60 * 24) pipeline.execute() record_request_stop_data(log_data) queue_json_publish("message_sender", dict(request=msg['request'], req_id=msg['req_id'], server_meta=dict(user_id=self.session.user_profile.id, client_id=self.client_id, return_queue="tornado_return", log_data=log_data, request_environ=dict(REMOTE_ADDR=self.session.conn_info.ip))), fake_message_sender) def on_close(self): # type: () -> None log_data = dict(extra='[transport=%s]' % (self.session.transport_name,)) record_request_start_data(log_data) if self.close_info is not None: write_log_line(log_data, path='/socket/close', method='SOCKET', remote_ip=self.session.conn_info.ip, email='unknown', client_name='?', status_code=self.close_info.status_code, error_content=self.close_info.err_msg) else: deregister_connection(self) email = self.session.user_profile.email \ if self.session.user_profile is not None else 'unknown' write_log_line(log_data, path='/socket/close', method='SOCKET', remote_ip=self.session.conn_info.ip, email=email, client_name='?') self.did_close = True def fake_message_sender(event): # type: (Dict[str, Any]) -> None log_data = dict() # type: Dict[str, Any] record_request_start_data(log_data) req = event['request'] try: sender = get_user_profile_by_id(event['server_meta']['user_id']) client = get_client(req['client']) msg_id = check_send_message(sender, client, req['type'], extract_recipients(req['to']), req['subject'], req['content'], local_id=req.get('local_id', None), sender_queue_id=req.get('queue_id', None)) resp = {"result": "success", "msg": "", "id": msg_id} except JsonableError as e: resp = {"result": "error", "msg": str(e)} server_meta = event['server_meta'] server_meta.update({'worker_log_data': log_data, 'time_request_finished': time.time()}) result = {'response': resp, 'req_id': event['req_id'], 'server_meta': server_meta} respond_send_message(result) def respond_send_message(data): # type: (Mapping[str, Any]) -> None log_data = data['server_meta']['log_data'] record_request_restart_data(log_data) worker_log_data = data['server_meta']['worker_log_data'] forward_queue_delay = worker_log_data['time_started'] - log_data['time_stopped'] return_queue_delay = log_data['time_restarted'] - data['server_meta']['time_request_finished'] service_time = data['server_meta']['time_request_finished'] - worker_log_data['time_started'] log_data['extra'] += ', queue_delay: %s/%s, service_time: %s]' % ( format_timedelta(forward_queue_delay), format_timedelta(return_queue_delay), format_timedelta(service_time)) client_id = data['server_meta']['client_id'] connection = get_connection(client_id) if connection is None: logger.info("Could not find connection to send response to! client_id=%s" % (client_id,)) else: connection.session.send_message({'req_id': data['req_id'], 'type': 'response', 'response': data['response']}) # TODO: Fill in client name # TODO: Maybe fill in the status code correctly write_log_line(log_data, path='/socket/service_request', method='SOCKET', remote_ip=connection.session.conn_info.ip, email=connection.session.user_profile.email, client_name='?') # We disable the eventsource and htmlfile transports because they cannot # securely send us the zulip.com cookie, which we use as part of our # authentication scheme. sockjs_router = sockjs.tornado.SockJSRouter(SocketConnection, "/sockjs", {'sockjs_url': 'https://%s/static/third/sockjs/sockjs-0.3.4.js' % ( settings.EXTERNAL_HOST,), 'disabled_transports': ['eventsource', 'htmlfile']}) def get_sockjs_router(): # type: () -> sockjs.tornado.SockJSRouter return sockjs_router