443 lines
15 KiB
Python
443 lines
15 KiB
Python
# -*- coding: utf-8 -*-
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# Copyright 2014-2016 OpenMarket Ltd
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""This module contains REST servlets to do with registration: /register"""
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from twisted.internet import defer
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from synapse.api.errors import SynapseError, Codes
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from synapse.api.constants import LoginType
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from synapse.api.auth import get_access_token_from_request
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from .base import ClientV1RestServlet, client_path_patterns
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import synapse.util.stringutils as stringutils
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from synapse.http.servlet import parse_json_object_from_request
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from synapse.types import create_requester
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from synapse.util.async import run_on_reactor
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from hashlib import sha1
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import hmac
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import logging
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logger = logging.getLogger(__name__)
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# We ought to be using hmac.compare_digest() but on older pythons it doesn't
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# exist. It's a _really minor_ security flaw to use plain string comparison
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# because the timing attack is so obscured by all the other code here it's
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# unlikely to make much difference
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if hasattr(hmac, "compare_digest"):
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compare_digest = hmac.compare_digest
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else:
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def compare_digest(a, b):
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return a == b
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class RegisterRestServlet(ClientV1RestServlet):
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"""Handles registration with the home server.
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This servlet is in control of the registration flow; the registration
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handler doesn't have a concept of multi-stages or sessions.
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"""
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PATTERNS = client_path_patterns("/register$", releases=(), include_in_unstable=False)
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def __init__(self, hs):
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"""
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Args:
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hs (synapse.server.HomeServer): server
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"""
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super(RegisterRestServlet, self).__init__(hs)
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# sessions are stored as:
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# self.sessions = {
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# "session_id" : { __session_dict__ }
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# }
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# TODO: persistent storage
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self.sessions = {}
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self.enable_registration = hs.config.enable_registration
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self.auth_handler = hs.get_auth_handler()
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self.handlers = hs.get_handlers()
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def on_GET(self, request):
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if self.hs.config.enable_registration_captcha:
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return (
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200,
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{"flows": [
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{
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"type": LoginType.RECAPTCHA,
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"stages": [
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LoginType.RECAPTCHA,
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LoginType.EMAIL_IDENTITY,
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LoginType.PASSWORD
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]
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},
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{
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"type": LoginType.RECAPTCHA,
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"stages": [LoginType.RECAPTCHA, LoginType.PASSWORD]
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}
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]}
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)
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else:
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return (
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200,
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{"flows": [
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{
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"type": LoginType.EMAIL_IDENTITY,
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"stages": [
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LoginType.EMAIL_IDENTITY, LoginType.PASSWORD
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]
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},
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{
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"type": LoginType.PASSWORD
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}
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]}
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)
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@defer.inlineCallbacks
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def on_POST(self, request):
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register_json = parse_json_object_from_request(request)
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session = (register_json["session"]
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if "session" in register_json else None)
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login_type = None
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if "type" not in register_json:
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raise SynapseError(400, "Missing 'type' key.")
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try:
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login_type = register_json["type"]
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is_application_server = login_type == LoginType.APPLICATION_SERVICE
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is_using_shared_secret = login_type == LoginType.SHARED_SECRET
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can_register = (
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self.enable_registration
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or is_application_server
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or is_using_shared_secret
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)
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if not can_register:
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raise SynapseError(403, "Registration has been disabled")
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stages = {
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LoginType.RECAPTCHA: self._do_recaptcha,
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LoginType.PASSWORD: self._do_password,
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LoginType.EMAIL_IDENTITY: self._do_email_identity,
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LoginType.APPLICATION_SERVICE: self._do_app_service,
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LoginType.SHARED_SECRET: self._do_shared_secret,
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}
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session_info = self._get_session_info(request, session)
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logger.debug("%s : session info %s request info %s",
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login_type, session_info, register_json)
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response = yield stages[login_type](
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request,
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register_json,
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session_info
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)
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if "access_token" not in response:
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# isn't a final response
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response["session"] = session_info["id"]
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defer.returnValue((200, response))
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except KeyError as e:
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logger.exception(e)
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raise SynapseError(400, "Missing JSON keys for login type %s." % (
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login_type,
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))
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def on_OPTIONS(self, request):
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return (200, {})
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def _get_session_info(self, request, session_id):
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if not session_id:
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# create a new session
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while session_id is None or session_id in self.sessions:
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session_id = stringutils.random_string(24)
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self.sessions[session_id] = {
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"id": session_id,
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LoginType.EMAIL_IDENTITY: False,
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LoginType.RECAPTCHA: False
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}
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return self.sessions[session_id]
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def _save_session(self, session):
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# TODO: Persistent storage
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logger.debug("Saving session %s", session)
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self.sessions[session["id"]] = session
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def _remove_session(self, session):
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logger.debug("Removing session %s", session)
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self.sessions.pop(session["id"])
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@defer.inlineCallbacks
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def _do_recaptcha(self, request, register_json, session):
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if not self.hs.config.enable_registration_captcha:
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raise SynapseError(400, "Captcha not required.")
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yield self._check_recaptcha(request, register_json, session)
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session[LoginType.RECAPTCHA] = True # mark captcha as done
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self._save_session(session)
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defer.returnValue({
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"next": [LoginType.PASSWORD, LoginType.EMAIL_IDENTITY]
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})
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@defer.inlineCallbacks
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def _check_recaptcha(self, request, register_json, session):
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if ("captcha_bypass_hmac" in register_json and
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self.hs.config.captcha_bypass_secret):
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if "user" not in register_json:
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raise SynapseError(400, "Captcha bypass needs 'user'")
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want = hmac.new(
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key=self.hs.config.captcha_bypass_secret,
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msg=register_json["user"],
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digestmod=sha1,
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).hexdigest()
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# str() because otherwise hmac complains that 'unicode' does not
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# have the buffer interface
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got = str(register_json["captcha_bypass_hmac"])
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if compare_digest(want, got):
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session["user"] = register_json["user"]
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defer.returnValue(None)
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else:
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raise SynapseError(
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400, "Captcha bypass HMAC incorrect",
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errcode=Codes.CAPTCHA_NEEDED
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)
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challenge = None
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user_response = None
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try:
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challenge = register_json["challenge"]
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user_response = register_json["response"]
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except KeyError:
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raise SynapseError(400, "Captcha response is required",
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errcode=Codes.CAPTCHA_NEEDED)
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ip_addr = self.hs.get_ip_from_request(request)
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handler = self.handlers.registration_handler
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yield handler.check_recaptcha(
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ip_addr,
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self.hs.config.recaptcha_private_key,
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challenge,
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user_response
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)
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@defer.inlineCallbacks
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def _do_email_identity(self, request, register_json, session):
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if (self.hs.config.enable_registration_captcha and
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not session[LoginType.RECAPTCHA]):
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raise SynapseError(400, "Captcha is required.")
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threepidCreds = register_json['threepidCreds']
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handler = self.handlers.registration_handler
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logger.debug("Registering email. threepidcreds: %s" % (threepidCreds))
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yield handler.register_email(threepidCreds)
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session["threepidCreds"] = threepidCreds # store creds for next stage
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session[LoginType.EMAIL_IDENTITY] = True # mark email as done
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self._save_session(session)
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defer.returnValue({
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"next": LoginType.PASSWORD
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})
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@defer.inlineCallbacks
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def _do_password(self, request, register_json, session):
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yield run_on_reactor()
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if (self.hs.config.enable_registration_captcha and
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not session[LoginType.RECAPTCHA]):
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# captcha should've been done by this stage!
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raise SynapseError(400, "Captcha is required.")
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if ("user" in session and "user" in register_json and
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session["user"] != register_json["user"]):
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raise SynapseError(
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400, "Cannot change user ID during registration"
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)
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password = register_json["password"].encode("utf-8")
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desired_user_id = (
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register_json["user"].encode("utf-8")
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if "user" in register_json else None
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)
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handler = self.handlers.registration_handler
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(user_id, token) = yield handler.register(
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localpart=desired_user_id,
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password=password
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)
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if session[LoginType.EMAIL_IDENTITY]:
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logger.debug("Binding emails %s to %s" % (
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session["threepidCreds"], user_id)
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)
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yield handler.bind_emails(user_id, session["threepidCreds"])
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result = {
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"user_id": user_id,
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"access_token": token,
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"home_server": self.hs.hostname,
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}
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self._remove_session(session)
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defer.returnValue(result)
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@defer.inlineCallbacks
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def _do_app_service(self, request, register_json, session):
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as_token = get_access_token_from_request(request)
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if "user" not in register_json:
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raise SynapseError(400, "Expected 'user' key.")
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user_localpart = register_json["user"].encode("utf-8")
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handler = self.handlers.registration_handler
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user_id = yield handler.appservice_register(
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user_localpart, as_token
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)
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token = yield self.auth_handler.issue_access_token(user_id)
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self._remove_session(session)
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defer.returnValue({
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"user_id": user_id,
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"access_token": token,
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"home_server": self.hs.hostname,
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})
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@defer.inlineCallbacks
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def _do_shared_secret(self, request, register_json, session):
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yield run_on_reactor()
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if not isinstance(register_json.get("mac", None), basestring):
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raise SynapseError(400, "Expected mac.")
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if not isinstance(register_json.get("user", None), basestring):
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raise SynapseError(400, "Expected 'user' key.")
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if not isinstance(register_json.get("password", None), basestring):
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raise SynapseError(400, "Expected 'password' key.")
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if not self.hs.config.registration_shared_secret:
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raise SynapseError(400, "Shared secret registration is not enabled")
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user = register_json["user"].encode("utf-8")
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password = register_json["password"].encode("utf-8")
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admin = register_json.get("admin", None)
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# Its important to check as we use null bytes as HMAC field separators
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if "\x00" in user:
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raise SynapseError(400, "Invalid user")
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if "\x00" in password:
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raise SynapseError(400, "Invalid password")
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# str() because otherwise hmac complains that 'unicode' does not
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# have the buffer interface
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got_mac = str(register_json["mac"])
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want_mac = hmac.new(
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key=self.hs.config.registration_shared_secret,
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digestmod=sha1,
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)
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want_mac.update(user)
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want_mac.update("\x00")
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want_mac.update(password)
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want_mac.update("\x00")
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want_mac.update("admin" if admin else "notadmin")
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want_mac = want_mac.hexdigest()
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if compare_digest(want_mac, got_mac):
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handler = self.handlers.registration_handler
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user_id, token = yield handler.register(
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localpart=user,
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password=password,
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admin=bool(admin),
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)
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self._remove_session(session)
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defer.returnValue({
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"user_id": user_id,
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"access_token": token,
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"home_server": self.hs.hostname,
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})
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else:
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raise SynapseError(
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403, "HMAC incorrect",
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)
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class CreateUserRestServlet(ClientV1RestServlet):
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"""Handles user creation via a server-to-server interface
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"""
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PATTERNS = client_path_patterns("/createUser$", releases=())
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def __init__(self, hs):
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super(CreateUserRestServlet, self).__init__(hs)
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self.store = hs.get_datastore()
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self.handlers = hs.get_handlers()
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@defer.inlineCallbacks
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def on_POST(self, request):
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user_json = parse_json_object_from_request(request)
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access_token = get_access_token_from_request(request)
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app_service = self.store.get_app_service_by_token(
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access_token
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)
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if not app_service:
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raise SynapseError(403, "Invalid application service token.")
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requester = create_requester(app_service.sender)
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logger.debug("creating user: %s", user_json)
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response = yield self._do_create(requester, user_json)
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defer.returnValue((200, response))
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def on_OPTIONS(self, request):
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return 403, {}
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@defer.inlineCallbacks
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def _do_create(self, requester, user_json):
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yield run_on_reactor()
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if "localpart" not in user_json:
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raise SynapseError(400, "Expected 'localpart' key.")
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if "displayname" not in user_json:
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raise SynapseError(400, "Expected 'displayname' key.")
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localpart = user_json["localpart"].encode("utf-8")
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displayname = user_json["displayname"].encode("utf-8")
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password_hash = user_json["password_hash"].encode("utf-8") \
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if user_json.get("password_hash") else None
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handler = self.handlers.registration_handler
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user_id, token = yield handler.get_or_create_user(
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requester=requester,
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localpart=localpart,
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displayname=displayname,
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password_hash=password_hash
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)
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defer.returnValue({
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"user_id": user_id,
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"access_token": token,
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"home_server": self.hs.hostname,
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})
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def register_servlets(hs, http_server):
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RegisterRestServlet(hs).register(http_server)
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CreateUserRestServlet(hs).register(http_server)
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